DESCRIPTION
T i t l e of Invention: LIGHT EMITTING DEVICE AND IMAGE DISPLAY
SYSTEM
Technical F i e l d
[OOOl]
The p r e s e n t i n v e n t i o n r e l a t e s t o a l i g h t e m i t t i n g device
and an image d i s p l a y system.
Background A r t
[0002]
In t h e r e l a t e d a r t , a c o o r d i n a t e i n p u t device, which
d e t e c t s t h e p o s i t i o n of an l n d i c a t i o n t o o l ( f o r example, a p e n )
o p e r a t e d i n a predeterminedcoordinateinputregion, is known.
A c o o r d i n a t e i n p u t d e v i c e , which forms a l i g h t ( i n f r a r e d l i g h t )
l a y e r along a d i s p l a y s u r f a c e on t h e d i s p l a y s u r f a c e on which
an image is d i s p l a y e d , and d e t e c t s t h e i n d i c a t i o n p o s i t i o n s
of t h e i n d i c a t i o n t o o l by d e t e c t i n g t h e p o s i t i o n s of l i g h t
r e f l e c t e d b y t h e i n d i c a t i o n t o o l when a p r e d e t e r m i n e d p o s i t i o n
on t h e d i s p l a y s u r f a c e is i n d i c a t e d by t h e i n d i c a t i o n t o o l ,
i s known a s an example of such a coordinate input device ( f o r
example, r e f e r t o PTL 1).
[0003]
The coordinate i n p u t device d i s c l o s e d i n PTL 1 i n c l u d e s
an effective coordinate input region forming the display
surface of a display device; multiple sensor units including
a light projection unit forming the light layer along the
coordinate input region, and a light receiving unit;
retroreflective unitswhichare respectivelydisposedonthree
outer sides of the effective coordinate input region, and
reflect incident light; and a control/computational unit. In
the coordinate input device, the multiple sensor units detect
the change range of a light quantity distribution caused by
the operation of the indication tool in the effective
coordinate input region, and the control/computationa1 unit
calculatesacoordinatevalueintheeffectivecoordinateinput
region based on the number of change ranges and the number of
pen-downs of the indication tool.
In such a coordinate input device, the light projection
unit of the sensor unit includes an infrared light emitting
diode (LED) emitting infrared light, and a projection lens
projecting the infrared light in a range of approximately 90'.
The light projection unit is fixed to an upper hood.
Citation List
Patent Literature
[0004]
PTL 1: Japanese Patent No. 4757144
Summary of Invention
Technical Problem
[0005]
As describedabove, the coordinate input devicedisclosed
in PTL 1 is required to form a light layer along the effective
coordinate input region on the effective coordinate input
region on which an image is displayed. However, in the
coordinate input device disclosed in PTL 1, an emission
direction of light projected from the light projection unit
cannot be adjusted.
For this reason, variations in a relationship between
an input surface (for example, a screen) and a light projection
angle may occur due to roughness of a wall on which the light
projection unit is mounted or interchange of components, and
the light layer may not be able to be properly formed. A more
accurate fixing of the sensor units is considered to cope with
such a problem, however, in this case, there is a problem in
that the mounting of the sensor units becomes complicated.
[0006]
An object of the present invention is to provide a light
emitting device capable of adjusting an emission direction of
light, and an image display system.
Solution to Problem
[0007]
A light emitting device according to a first aspect of
the present inventionincludes: alight source unit that emits
light to a region along a predetermined flat surface; a frame
in which the light source unit is provided; and an adjustment
mechanism that adjusts an emission direction of light emitted
fromthe light source unit, relative tothe predetermined flat
surface.
[0008]
Accordingtothe first aspect, since the frame is provided
with the adjustmentmechanismadjustingthe emission direction
of light emitted from the light source unit, relative to the
predetermined flat surface, it is possible to adjust the
inclination of the frame relative to the predetermined flat
surface. As a result, it is possible to adjust the emission
direction of light emitted frornthe light source unit provided
in the frame, relative to the predetermined flat surface.
[0009]
In the first aspect, the frame preferably includes a
pivotal portion. The adjustment mechanismpreferably adjusts
the emission direction of light by adjusting the inclination
of the frame around the pivotal portion relative to the
predetermined flat surface.
According to the first aspect, since the frame includes
the pivotal portion, the adjustment mechanism is capable of
reliably adjusting the inclination of the frame around the
pivotal portion relative to the predetermined flat surface.
As a result, it is possible to reliably adjust the emission
direction of light emitted fromthe light source unit provided
in the frame, relative to the predetermined flat surface.
[OOlO]
In the first aspect, the pivotal portion is preferably
positioned opposite to the emission direction of light with
respect tothe adjustmentmechanism. The adjustment mechanism
preferably includes a first adjustment mechanism and a second
adjustment mechanism, which are provided in a portion of the
frame on the side of the emission direction of light, and are
disposed while being spaced therebetween in the emission
direction of light when seen from a direction perpendicular
to the predetermined flat surface.
According to the first aspect, since the pivotal portion
is positionedoppositetothe emission direction of light with
respect to the adjustment mechanism, it is possible to adjust
the inclination ofthe frame around the pivotal portion, which
is positioned opposite to the emission direction of light,
relative to the predetermined flat surface via the first
adjustment mechanismthat is positioned atone end ofthe frame
in the intersecting direction, and the second adjustment
mechanism that is positioned at the other end. As a result,
it is possible to minutely adjust the emission direction of
light emitted fromthelight source unit provide dinthe frame,
relative to the predetermined flat surface.
[OOll]
In the first aspect, at least either of the first
adjustment mechanism and the second adjustment mechanism
preferably includes a fixing member that is disposed along an
end portlon of the frame in the emission direction of llght,
and is fixed independently from the frame; a shaft member that
is turnably provided in the fixlng member; and a moving member
which is engaged with the shaft member, and is moved along a
central axis of the shaft member such that the frame 1s moved
along the central axis.
According to the first aspect, when the shaft member,
which is turnably provided in the fixing member fixed
independently from the frame, is turned, the moving member is
moved along the central axis of the shaft member such that the
frame is moved along the central axis of the shaft member.
Accordingly, it is possible to minutely adjust the inclination
of the frame relative to the predetermined flat surface
according to the turning of the shaft member. In a case where
each of the first adjustment mechanism and the second
adjustment mechanism has such a configuration, it is possible
to more minutely adjust the inclination of the frame. As a
result, it is possible to more minutely adjust the emission
direction of light.
[0012]
In the first aspect, the shaftmemberpreferablyincludes
a screwed portion that is spirally formed on a circumferential
surface of the shaft member along the central axis, and is
screwedto themovingmember. Themovingmember is preferably
in contact with the frame in a state where the turning of the
moving member around the central axis is limited.
According tothe first aspect, it is possibleto reliably
move the movlng member in a direction along the central axis
of the shaft member by the turning of the shaft member.
Accordingly, it is possible to very minutely adjust the
inclination of the frame relative to the predetermined flat
surface. As a result, it is possible to very minutely adjust
the emission direction of light relative to the predetermined
flat surface.
[0013]
In the first aspect, preferably, the light emitting
device further includes a housing that accommodates the light
source unit, the frame, and the adjustment mechanism
thereinside. The fixing member is preferably fixed inside of
the housing. The housing preferably includes an operation
member, which is positioned outside of the housing and is
turnably supported by the housing, and a transmission member,
whichincludes aturningaxis coaxialwiththat ofthe operation
member and is engaged with the shaft member such that the shaft
member is turned by the turning of the operation member
[0014]
According t o the f i r s t a s p e c t , t h e s h a f t p o r t i o n , which
is engaged with t h e t r a n s m i s s i o n member, can be i n d i r e c t l y
t u r n e d b y t u r n i n g t h e o p e r a t i o n m e m b e r b y a u s e r . Accordingly,
it is p o s s i b l e t o a d j u s t t h e i n c l i n a t i o n of the frame
accommodatedinside t h e housing by o n l y t u r n i n g t h e o p e r a t i o n
member provided o u t s i d e of t h e housing.
In a case where t h e s h a f t member is d i r e c t l y turned, it
is considered t h a t t h e frame o r the f i x i n g member may be
deformeddueto a l o a d a p p l i e d t o t h e shaftmember. I n c o n t r a s t ,
i n t h e f i r s t a s p e c t , the operationmemberturns t h e shaftmember
v i a t h e t r a n s m i s s i o n member such t h a t t h e occurrence of such
a deformation can be suppressed.
[0015]
I n t h e f i r s t a s p e c t , t h e housing p r e f e r a b l y i n c l u d e s a
cover member covering t h e o p e r a t i o n member.
A c c o r d i n g t o t h e f i r s t a s p e c t , forexample, it i s p o s s i b l e
t o p r e v e n t a change i n t h e emission d i r e c t i o n of l i g h t , which
is c a u s e d b y t h e u n i n t e n t i o n a l t u r n i n g o f t h e operationmember,
by covering t h e o p e r a t i o n member with t h e cover member a f t e r
ending the adjustment of t h e emission d i r e c t i o n of l i g h t .
[00161
In t h e f i r s t a s p e c t , t h e housing p r e f e r a b l y i n c l u d e s a
recessed p o r t i o n t h a t is p o s i t i o n e d a t t h e circumference of
the o p e r a t i o n member, and is formed along a t u r n i n g d i r e c t i o n
of the operation member.
According to the flrst aspect, the recessed portion is
formed at the circumference of the operation member in the
housing along the turning direction of the operation member.
Accordingly, a space is formed such thata user can put fingers
into the space to hold the operation member. As a result, the
user can easily turn the operation member along the surface
of the housing on which the operation member is provided. For
this r e a s o n , t h e u s e r c a n e a s i l y t r a n s m i t f o r c e t o t h e o p e r a t i o n
member, and the inclination of the operation member relative
to the surface of the housing is suppressed, and thus, it is
possible to reduce a load to the operation member or the
transmission member.
[00171
In the first aspect, preferably, the light emitting
device further includes a shock-absorbing portion which is
positioned between the housing and the frame, and, when the
light emitting device falls to the ground, which comes into
contact with the frame such that contact between the light
sourceunitprovidedinthe frameandthehousingissuppressed.
According to the first aspect, in a case where the light
emitting device falls to the ground, the shock-absorbing
portion comes into contact with the frame such that contact
between the housing and the light source unitcanbeprevented.
Accordingly, it is possible to prevent damage to the light
source unit caused by a falling impact without implementing
a countermeasure against an impact to the light source unit.
In this configuration, it is possible to maintain the
inclinationofthe frame a d j u s t e d r e l a t i v e t o t h e p r e d e t e r m i n e d
flat surface, even after the light emitting device falls to
the ground.
[0018]
In the first aspect, the shock-absorbing portion is
preferably formed integrally with the housing.
As an example of the shock-absorbing portion, it is
possible to illustrate a pin that protrudes to the frame from
an inner surface of the housing on a light source unit side,
and is positioned between the frame and the inner surface of
the housing.
According tothe first aspect, since the shock-absorbing
portion is formed integrally with the housing, it is not
necessarytoprovideaseparate shock-absorbingcomponent. As
a result, it is possible to suppress the complexity of a
manufacturing process of the light emitting device, and a
manufacturing cost increase.
Either of a protruding shape and a recessed shape can
be adopted as the shape of a tip portion (portion coming into
contact with the frame) of the shock-absorbing portion. In
a case where a recessed shape is adopted, it is possible to
more effectively absorb the impact.
[0019]
An image d i s p l a y system according t o a second aspect of
the p r e s e n t i n v e n t i o n i n c l u d e s : a d i s p l a y device t h a t d i s p l a y s
a received image; the l i g h t e m i t t i n g device whlch emits light
t o a region along a d i s p l a y s u r f a c e on which t h e image is
d i s p l a y e d b y t h e d i s p l a y device, and forms a l i g h t l a y e r along
t h e d i s p l a y s u r f a c e ; a d e t e c t i o n device t h a t d e t e c t s the
r e f l e c t e d p o s i t i o n s of l i g h t , which is emitted from t h e l i g h t
e m i t t i n g device, i n t h e region; and an image g e n e r a t i o n device
t h a t g e n e r a t e s animage according t o a d e t e c t e d r e s u l t o b t a i n e d
by t h e d e t e c t i o n device, and t r a n s m i t s t he image t o t h e d i s p l a y
device.
[0020]
According t o t h e second a s p e c t , it is p o s s i b l e t o obtain
the same e f f e c t s a s those of t h e l i g h t e m i t t i n g device of the
f i r s t a s p e c t .
Since l i g h t , which i s emitted from t h e l i g h t e m i t t i n g
device i n t h e predetermined range, can be p r o p e r l y a l i g n e d
along t h e d i s p l a y s u r f a c e , it is possibletoreducethedistance
between a l i g h t l a y e r and t h e d i s p l a y s u r f a c e t o a r e l a t i v e l y
small value. For t h i s reason, a user can e a s i l y perform an
o p e r a t i o n ( f o r example, a double c l i c k o p e r a t i o n ) of
continuously i n d i c a t i n g a predetermined p o r t i o n i n an image
displayed on t h e d i s p l a y s u r f a c e with an i n d i c a t i o n t o o l
r e f l e c t i n g l i g h t emitted from t h e l i g h t e m i t t i n g device, t h a t
is, an operation of continuously inserting into and removing
the indication tool from the light layer. As a result, the
operability of the image display system can be improved.
Brief Description of Drawings
[00211
[Fig. 11 Fig. 1 is a view illustrating the configuration
andthe state of use of an image display systemin an embodiment
of the present invention.
[Fig. 21 Fig. 2is aperspectiveviewillustrating alight
emitting device in the embodiment.
[Fig. 31 Fig. 3 is a view illustrating a bottom surface
portion of the light emitting device in the embodiment.
[Fig. 41 Fig. 4 is a perspective view illustrating the
exterior of the light emitting device in the embodiment from
which a cover is detached.
[Fig. 51 Fig. 5 is a top view illustrating the external
surface of an upper case in the embodiment.
[Fig. 61 Fig. 6 is a perspective view illustrating the
exterior of the light emitting device in the embodiment from
which the upper case is detached.
[Fig. 71 Fig. 7 is a top view illustrating the light
emitting device in the embodiment from which the upper case
is detached.
[Fig. 81 Fig. 8is aperspectiveviewillustratingalight
curtain unit in the embodiment.
[Fig. 91 Fig. 9 is a view of the light curtain unit in
the embodiment when seen from a bottom surface side.
[Fig. 101 Fig. 10 is a perspective view illustrating a
lower case in the embodiment.
[Fig. 111 Fig. 11is asectionalviewofthelightemitting
device in the embodiment before an emission direction of light
emitted from a light source unit is adjusted.
[Fig. 121 Fig. 12 is a sectionalview ofthe light emitting
device in the embodiment after the emission direction of light
emitted fromthe light source unit is adjustedto atop surface
side.
[Fig. 131 Fig. 13is a sectionalviewofthe light emitting
device in the embodiment after the emission direction of light
emitted from the light source unit is adjusted to the bottom
surface side.
[Fig. 141 Fig. 14 is a schematic view illustrating a
method of adjusting the light source unit in the embodiment.
Description of Embodiments
[GO221
Hereinafter, an embodiment ofthe present inventionwill
be described with reference to the accompanying drawings.
[Configuration of Image Display System]
Fig. 1 is a view illustrating the configuration and the
state of use of an image display system 10 in the embodiment.
As illustrated in Fig. 1, the image display system 10
in the embodiment includes a light emitting device 1; a
projector PJ; a screen SC; and an image generation device GN
(not illustrated). In the image display system 10, the light
emitting device 1 forms a light layer along the screen SC by
emitting light (infrared light in the embodiment) along the
screen SC. The projector PJ projects an image, which is
received from the image generation device GN, onto the screen
SC which is a projection surface (display surface), and
displays the image thereon in a visible manner. In addition,
the projector PJ includes an image capturing device capturing
animageofanimagingregioncontaininganimagedisplayregion
on the screen SC, and transmits a captured image, which is
obtainedbytheimage capturing device, tothe image generation
device GN. The image generation device GN analyzes the
reflected positions of light (the indication positions of a
finger, an indication tool, or the like), which is emitted from
the light emitting device 1 and is reflected by a finger of
a user or an indication tool, in the image display region based
on the captured image. The image generation device GN
generates an image, in which the reflected positions are
illustratedbydots or lines, basedonaresultoftheanalysis,
and transmits the image to the projector PJ. Accordingly, in
the image display system 10 of the embodiment, an image
containing the locus of the finger or the indication tool on
the screen SC is displayed on the screen SC.
Hereinafter, the configuration of the image display
system 10 will he described.
[0023]
The light emitting device 1 has a function of forming
a light layer along a predetermined flat surface.
In the embodiment, as illustrated in Fig. 1, the light
emitting device 1 is provided on a wall surface WS on which
the screen SC is installed. Accordingly, the light emitting
device 1 forms a light layer in a region (interactive region
LE) along the screen SC which is a predetermined flat surface.
The specific configuration of the light emitting device
1 will be described later.
[0024]
[Configuration of Projector]
The projector PJ is suspended from a suspension metal
fixture M fixed to the wall surface WS, and is provided close
to a ceiling surface RS. The projector PJ serves as an image
displaydevicethatmodulateslightem~tted froma light source
device provided inside of the image display devlce, forms an
image according to image information received from the image
generation device GN, and magnifies and projects the formed
image onto a projection surface SC1 of the screen SC.
Inaddition, the projector PJincludesanimage capturing
device CM c a p t u r i n g an image o f a n imaging r e g i o n c o n t a i n i n g
the range (image d i s p l a y range) of p r o j e c t i o n of an image onto
t h e p r o j e c t i o n s u r f a c e SC1, and t r a n s m i t s a captured image,
which is obtained by the image c a p t u r i n g device, t o the imaye
g e n e r a t i o n d e v i c e GN. The image c a p t u r i n g device CM forms a
d e t e c t i o n device o f t h e p r e s e n t i n v e n t i o n along with t h e image
g e n e r a t i o n d e v i c e GN.
LO0251
[Configuration of Image Generation Device]
The image g e n e r a t i o n d e v i c e GN i s formed of a personal
computer (PC) and t h e l i k e . The imaye g e n e r a t i o n d e v i c e GN
a c q u i r e s t h e c a p t u r e d i m a g e t r a n s m i t t e d f r o m t h e p r o j e c t o r PJ,
anddetectsthereflectedpositionsofthelightinthecaptured
image which i s acquired. It is p o s s i b l e t o know the range of
the image d i s p l a y region i n t h e captured image i n advance by
performing c a l i b r a t i o n . For t h i s reason, it is p o s s i b l e t o
a c q u i r e t h e c o o r d i n a t e s of t h e i n d i c a t i o n p o s i t i o n s of the
i n d i c a t i o n t o o l o r t h e l i k e on t h e p r o j e c t i o n s u r f a c e SC1 by
d e t e c t i n g t h e r e f l e c t e d p o s i t i o n s .
The image g e n e r a t i o n d e v i c e GNgenerates an image inwhich
the acquired i n d i c a t i o n p o s i t i o n s a r e i l l u s t r a t e d by dots o r
l i n e s . The image generated i n t h i s manner is t r a n s m i t t e d t o
t h e p r o j e c t o r P J .
[0026]
[Configuration of L i g h t E m i t t i n g Device]
H e r e i n a f t e r , t h e s p e c i f i c c o n f i g u r a t i o n of t h e l i g h t
e m i t t i n g device w i l l be d e s c r i b e d .
Fig. 2 is a p e r s p e c t i v e view of the l i g h t e m i t t i n g device
1, and Fig. 3 is a view i l l u s t r a t i n g a bottom s u r f a c e p o r t i o n
of t h e l i g h t e m i t t i n g device 1.
As i l l u s t r a t e d i n Figs. 2 a n d 3 , t h e l i g h t e m i t t i n g d e v i c e
1 i n c l u d e s a housing 2 t h a t accommodates a d e v i c e body 3 ( t o
be d e s c r i b e d l a t e r ) i n s i d e t h e r e o f .
As i l l u s t r a t e d i n Fig. 2, t h e housing 2 i n c l u d e s a bottom
s u r f a c e p o r t i o n 2B; a top s u r f a c e p o r t i o n 2A; a f r o n t s u r f a c e
p o r t i o n 2C; a back s u r f a c e p o r t i o n 2D; a l e f t s u r f a c e p o r t i o n
2E; and a r i g h t s u r f a c e p o r t i o n 2F. Among t h e s e s u r f a c e
p o r t i o n s , t h e b o t t o m s u r f a c e p o r t i o n 2B f a c e s the wall s u r f a c e
WS when t h e l i g h t e m i t t i n g device 1 is i n s t a l l e d on t h e wall
s u r f a c e WS ( r e f e r t o Flg. 1). The t o p s u r f a c e p o r t i o n 2A i s
p o s i t i o n e d o p p o s i t e t o t h e bottom s u r f a c e p o r t i o n 2B. The
f r o n t s u r f a c e p o r t i o n 2 C i s p o s i t i o n e d t o a n e m i s s i o n d i r e c t i o n
of l i g h t emitted from a l i g h t source u n i t 6 ( t o be described
l a t e r ) . The back s u r f a c e p o r t i o n 2D i s p o s i t i o n e d opposite
t o t h e f r o n t s u r f a c e p o r t i o n 2C. When f a c i n g t h e f r o n t s u r f a c e
p o r t i o n 2C so t h a t t h e top s u r f a c e p o r t i o n 2A is p o s i t l o n e d
on an upper s l d e , t h e l e f t s u r f a c e p o r t i o n 2E is p o s i t l o n e d
on a l e f t s i d e , and t h e r i g h t s u r f a c e p o r t i o n 2F is p o s i t i o n e d
on a r i g h t s i d e .
[0027]
The housing 2 is configured t o i n c l u d e an upper case 21;
a lower case 22; and a cover 23.
The upper case 21 forms a p o r t i o n o f each of t h e top
s u r f a c e p o r t i o n 2A, t h e f r o n t s u r f a c e p o r t i o n 2C, t h e back
s u r f a c e p o r t i o n 2D, the l e f t s u r f a c e p o r t i o n 2E, and t h e r i g h t
s u r f a c e p o r t i o n 2F. The lower c a s e 22 forms a p o r t i o n of each
of t h e bottom s u r f a c e p o r t i o n 2B, t h e f r o n t s u r f a c e p o r t i o n
2C, t h e back s u r f a c e p o r t i o n 2D, the l e f t s u r f a c e p o r t i o n 2E,
and t h e r i g h t s u r f a c e p o r t i o n 2F.
A l e f t recessed p o r t i o n 2G which is formed across the
bottom s u r f a c e p o r t i o n 2B, the f r o n t s u r f a c e p o r t i o n 2C, and
the l e f t s u r f a c e p o r t i o n 2E, and a r i g h t recessed p o r t i o n 2H
which is formed a c r o s s the bottom s u r f a c e p o r t i o n 2B, t h e f r o n t
s u r f a c e p o r t i o n 2 C , a n d t h e r i g h t s u r f a c e p o r t i o n 2 F , a r e formed
i n t h e lower case 22 among t h e s e c a s e s .
The cover 23 is mounted on t h e upper case 21, and covers
a d i a l 211 ( r e f e r t o Figs. 4 and 5) t h a t is provided as an
o p e r a t i o n member on t h e upper case 21.
[0028]
As i l l u s t r a t e d i n Fig. 3, t h e bottom s u r f a c e p o r t i o n 2B
i n c l u d e s a h o l e p o r t i o n (not i l l u s t r a t e d ) a t each c o r n e r . A
screw S1 is f i t t e d i n t o each h o l e p o r t i o n . The screws S1 a r e
i n s e r t e d i n t o t h e top s u r f a c e p o r t i o n 2A such t h a t the lower
case 22 is screw-fixed t o the upper case 21.
S p e c i f i c a l l y , a f i r s t l i g h t s o u r c e u n i t 6 L ( r e f e r t o Figs.
8 and 9) of the light source unit 6 (to be described later)
is exposed inside of the left recessed portion 2G (to be
described later). The first light source unit 6L diffuses and
emits light to a range definedby alternate long and short dash
lines with an L1 direction being centered in Fig. 3.
A second light source unit 6R (refer to Figs. 6 and 7)
of the light source unit 6 (to be described later) is exposed
inside of the right recessed portion 2H. The second light
source unit 6R diffuses and emits light to a range defined by
alternate long and short dash lines with an L2 direction being
centered in Fig. 3.
A portion of light layers (light layers formed in the
ranges defined by the alternate long and short dash lines)
formed by the first light source unit 6L and the second light
source unit 6R overlap each other. The entire projection
surface SCl (refer to Fig. I) is covered with the light layers.
[0029]
Fig. 4 is a perspective view illustrating the light
emitting device 1 from which the cover 23 is detached. Fig.
5 is a top view illustrating the light emitting device 1 from
which the cover 23 is detached.
As illustratedin Figs. 4 and 5, in a case where the cover
23 is detached from the upper case 21 on which the cover 23
is attachably and detachably provided, two dials 211 and two
recessed portions 215, which are positioned on an external
s u r f a c e 21A ( t h a t i s , t h e top s u r f a c e p o r t i o n 2A) of t h e upper
case 21, a r e exposed.
[0030]
The d i a l s 211 (211R and 211L r e p r e s e n t t h e d i a l s which
a r e r e s p e c t i v e l y p o s i t i o n e d on a r i g h t s u r f a c e p o r t i o n 2 F s i d e
a n d a l e f t s u r f a c e p o r t i o n 2E s i d e ) c o r r e s p o n d t o t h e o p e r a t i o n
members of t h e p r e s e n t i n v e n t i o n , and a r e t u r n a b l y supported
by the t o p s u r f a c e p o r t i o n 2A. A s i l l u s t r a t e d i n Fig. 5, each
of t h e d i a l s 211 i n c l u d e s a body p o r t i o n 212; a s h a f t p o r t i o n
213; and a gear 214.
The body p o r t i o n 212 is formed i n t o a s u b s t a n t i a l l y
c y l i n d r i c a l shape, and is p o s i t i o n e d o u t s i d e of t h e housing
2. The body p o r t i o n 212 is a p o r t i o n held by a user t o t u r n
t h e d i a l 211. Recesses and p r o t r u s i o n s a r e formed on a s i d e
s u r f a c e of t h e body p o r t i o n 212.
[0031]
The s h a f t p o r t i o n 213 is a bar-shaped member screw-fixed
t o a s u b s t a n t i a l l y c e n t r a l p o r t i o n of t h e body p o r t i o n 212.
The s h a f t p o r t i o n 2 1 3 i s l n s e r t e d i n t o a h o l e ( n o t i l l u s t r a t e d )
formed i n t h e top s u r f a c e p o r t i o n 2A.
The gear 214 is p o s i t i o n e d i n s i d e of the housing 2, and
is f i x e d t o t h e s h a f t p o r t i o n 213 such t h a t t h e gear 214 is
p o s i t i o n e d o p p o s i t e t o t h e body p o r t i o n 212. The gear 214 is
t u r n e d a r o u n d t h e s h a f t p o r t i o n ( s e r v i n g a s t h e a x i s o f t u r n i n g )
213 a l o n g w i t h t h e body p o r t i o n 212. I n o t h e r words, when t h e
body p o r t i o n 212 is turned i n e i t h e r d i r e c t i o n , t h e gear 214,
w h l c h i s c o n n e c t e d t o t h e b o d y p o r t i o n 212 v i a t h e s h a f t p o r t i o n
213, is turned i n the same t u r n i n g d i r e c t i o n a s t h a t of the
body p o r t i o n 212. The gear 214 meshes with a gear 721 of an
adjustment mechanism 7 ( t o be d e s c r i b e d l a t e r ) , and t u r n s t h e
gear 721. That i s , the gear 214 corresponds t o a transmission
member of t h e p r e s e n t i n v e n t i o n .
[00321
The recessed p o r t i o n s 215 (215R and 215L r e p r e s e n t t h e
recessed p o r t i o n s which a r e r e s p e c t i v e l y p o s i t i o n e d on the
r i g h t s u r f a c e p o r t i o n 2F s i d e and the l e f t s u r f a c e p o r t i o n 2E
s i d e ) arepositionedatthecircumferences o f t h e c o r r e s p o n d i n g
d i a l s 211 ( t h e body p o r t i o n s 2 1 2 ) . Each of the recessed
p o r t i o n s 215 i s formed i n t o a c i r c u l a r a r c shape along t h e
t u r n i n g direction of t h e d i a l 211. The r e c e s s e d p o r t i o n 215
is formed t o have a depth such t h a t a p o r t i o n of a f i n g e r of
a u s e r o p e r a t i n g t h e body p o r t i o n 212 can be i n s e r t e d i n t o t h e
recessed p o r t i o n 215.
roo331
[Configuration of Device Body]
Fig. 6 is a p e r s p e c t i v e view i l l u s t r a t i n g t h e l i g h t
e m i t t i n g device 1 from which t h e upper case 21 is detached,
when seen from a t o p s u r f a c e s i d e and a f r o n t s u r f a c e s i d e .
Fig. 7 i s a top view i l l u s t r a t i n g a s t a t e i n which t h e upper
case 21 is detached from t h e l i g h t e m i t t i n g device 1.
A s i l l u s t r a t e d i n F i g s . 6 a n d 7 , t h e d e v i c e b o d y 3 i n c l u d e s
a l i g h t c u r t a i n u n i t 4 and a s u b s t r a t e 8, and they a r e f i x e d
t o an i n n e r s u r f a c e of t h e lower case 2 2 .
The s u b s t r a t e 8 ofthesecomponentsisacontrolsubstrate
t h a t s u p p l i e s e l e c t r i c power t o the l i g h t c u r t a i n u n i t 4 , and
c o n t r o l s t h e l i g h t c u r t a i n u n i t 4 . The s u b s t r a t e 8 is
e l e c t r i c a l l y connected t o t h e l i g h t c u r t a i n u n i t 4 v i a a cable
81.
[0034]
[Configuration of Light Curtain Unit]
Fig. 8 is a p e r s p e c t i v e view of t h e l i g h t c u r t a i n u n i t
4 when seen from t h e t o p s u r f a c e s i d e and the f r o n t s u r f a c e
s i d e . Fig. 9 is a view of the l i g h t c u r t a i n u n i t 4 when seen
from a bottom s u r f a c e s l d e .
The l i g h t c u r t a i n u n i t 4 has a f u n c t i o n of forming l i g h t
l a y e r s ( l i g h t c u r t a i n s ) by e m i t t i n g l i g h t i n the range along
t h e p r o j e c t i o n s u r f a c e SC1, and has a f u n c t i o n of a d j u s t i n g
an emission d i r e c t i o n of t h e l i g h t . As i l l u s t r a t e d i n Figs.
6 t o 9, t h e l i g h t c u r t a i n u n i t 4 i n c l u d e s a frame 5; t h e l i g h t
source u n i t 6 e m i t t i n g l i g h t ; and t h e adjustment mechanism 7
t h a t a d j u s t s an emission d i r e c t i o n of l i g h t emitted from t h e
l i g h t source u n i t 6 by a d j u s t i n g t h e i n c l i n a t i o n of t h e frame
5 r e l a t i v e t o t h e p r o j e c t i o n s u r f a c e SC1.
[0035]
[Configuration of Frame]
The frame 5 i s a f i a t plate-shaped metal member, and
supports t h e l i g h t source u n i t 6 and t h e adjustment mechanism
7. S p e c i f i c a l l y , t h e l i g h t source u n i t 6 is disposed on a
s u r f a c e of t h e frame 5 which f a c e s a bottom s u r f a c e 22A ( r e f e r
t o F i g s . 6 a n d 7 ) o f t h e l o w e r c a s e 2 2 . Theadjustmentmechanism
7 is d i s p o s e d i n t h e v i c i n i t i e s ( i n t h e v i c i n i t y o f l e f t s u r f a c e
of both ends of a f r o n t s u r f a c e p o r t i o n 2C-side end p o r t i o n
of t h e frame 5 ( r e f e r t o Figs. 6 and 7 ) .
[0036]
As i l l u s t r a t e d i n Fig. 8, t h e frame 5 i n c l u d e s a p i v o t a l
p o r t i o n 51, and hole p o r t i o n s 53R, 53L, and 54 which a r e
p o s i t i o n e d a t t h e circumference of t h e p i v o t a l p o r t i o n 51.
The p i v o t a l p o r t i o n 51 i s disposed i n the v i c i n i t y of
an end p o r t i o n ( t h a t i s , on a back s u r f a c e 2D s i d e ] of a s u r f a c e
which f a c e s t h e upper case 21 and is p o s i t i o n e d opposlte t o
the emission direction of l i g h t emitted from the l i g h t source
u n i t 6. A t i p of t h e p i v o t a l p o r t i o n 51 is formed i n t o a
s u b s t a n t i a l l y hemispherical shape. The p i v o t a l p o r t i o n 51
serves a s a p i v o t ( t h e c e n t e r of t u r n i n g ) of t h e frame 5 when
the i n c l i n a t i o n (emission d i r e c t i o n of l i g h t ) of the frame 5
is a d j u s t e d by t h e adjustment mechanism 7 ( t o b e d e s c r i b e d
l a t e r ) . I n t h e embodiment, t h e p i v o t a l p o r t i o n 51 is disposed
i n a p o r t i o n i n which an extension l i n e on t h e L1 d i r e c t i o n
and an extension l i n e on t h e L2 d i r e c t i o n i n t e r s e c t each o t h e r
(refer to Fig. 3).
As illustrated in Figs. 6 and 7, a pressing member 24
is disposed inside of the lower case 22, and presses the frame
5 disposed inside of the lower case 22. Specifically, the
pressing member 24 is provided at a position corresponding to
the pivotal portion 51. A tip portion of the pivotal portion
51 is in contact with a surface of the pressing member 24 which
faces the frame 5. The pressingmember 24is fixedtothe lower
case 22 with a screw S2 inserted into the pressing member 24
and the hole portion 53L, and with a screw 52 inserted into
the pressing member 24 and the hole portion 53R.
LO0371
[Configuration of Light Source Unit]
As described above, the light source unit 6 is mounted
on a lower case 22 side of the frame 5. The light source 6
lncludes the first light source unit 6L positioned on a left
surface portion 2E side of the frame 5, and the second light
source unit 6R positioned on a right surface portion 2F side.
The first light source unit 6Landthe secondlight source
u n ~ t 6R emit light in the range along the project~on surface
SCl which is the predetermined flat surface. Specifically,
the first light source unit 6L forms a substantially uniform
light layer at a predetermined angle in relation to the Ll
directionwhichis centered (referto Fig. 3). The secondlight
source unit 6R forms substantially uniform light layer at a
predetermined angle i n r e l a t i o n t o t h e L2 d i r e c t i o n which i s
c e n t e r e d ( r e f e r t o Fig. 3 ) . The l i g h t l a y e r formedbythe f i r s t
l i g h t source u n i t 6L and t h e l i g h t l a y e r formed by t h e second
l i g h t source u n i t 6R overlap each o t h e r a t t h e c e n t e r of the
p r o j e c t i o n s u r f a c e SC1, and each of the l i g h t l a y e r s covers
the e n t i r e p r o j e c t s u r f a c e SC1. These l i g h t l a y e r s form the
i n t e r a c t i v e region LE.
[0038]
As i l l u s t r a t e d i n Fig. 9, each of the f i r s t l i g h t source
u n i t 6L and t h e second l i g h t source u n i t 6R i n c l u d e s a s o l i d
l i g h t source 61; an o p t i c a l device 62; a support member 63;
and a heat s i n k 64.
In t h e embodiment, t h e s o l i d l i g h t source 61 a l a s e r diode
(LD) e m i t t i n g i n f r a r e d l i g h t . The t u r n i n g on and off of the
s o l i d l i g h t source 61 i s c o n t r o l l e d by t h e s u b s t r a t e 8 .
The o p t i c a l device 62 d i f f u s e s and emits the l i g h t , which
is emitted fromthe s o l i d l i g h t source 61, along t h e p r o j e c t i o n
s u r f a c e SC1. T h e o p t i c a l d e v i c e 6 2 i n c l u d e s a c o l l i m a t i n g l e n s
and a Powell l e n s , which a r e not i l l u s t r a t e d . The Powell l e n s
of t h e s e l e n s e s uniformly d i f f u s e s and emits l i g h t , which i s
emitted from t h e s o l i d l i g h t source 61 and is collimated by
the c o l l i m a t i n g l e n s , i n a predetermined range along the
p r o j e c t i o n s u r f a c e SC1.
The support member 63 s u p p o r t s the o p t i c a l device 62,
and is f i x e d t o t h e frame 5.
The heat s i n k 64 is disposed o p p o s i t e t o t h e emission
directionoflightemittedfromthe s o l i d l i g h t source 61. The
heat s i n k 64 is t h e r m a l l y c o n d u c t i v e l y connected t o t h e s o l i d
l i g h t source 61, and r a d i a t e s heat conducted from t h e s o l i d
l i g h t source 61 such t h a t t h e s o l i d l i g h t source 61 is cooled.
[0039]
Herein, the p o s i t i o n of t h e l i g h t source u n i t 6 i n t h e
lower case 22 w i l l be d e s c r i b e d .
Fig. 10 is a p e r s p e c t i v e view of t h e lower case 22 when
seen f r o m t h e t o p s u r f a c e s i d e a n d t h e f r o n t s u r f a c e s i d e . That
i s , Fig. 10 is a p e r s p e c t i v e view i l l u s t r a t i n g t h e lower case
22 i n a s t a t e where t h e devicebody 3 i s detached f r o m t h e l i g h t
e m i t t i n g device 1 i n Fig. 6.
As i l l u s t r a t e d i n Fig. 10, t h e lower case 22 includes
an opening p o r t i o n 221.
The opening p o r t i o n 221 i s formed i n t h e bottom s u r f a c e
of t h e lower case 22 so a s t o correspond t o t h e shape of t h e
l i g h t source u n i t 6. In a case where t h e l i g h t c u r t a i n u n i t
4 is mounted on t h e lower case 22, t h e l i g h t source u n i t 6 is
exposed on a bottom s u r f a c e p o r t i o n 2B s i d e v i a t h e opening
p o r t i o n 221. In t h i s s t a t e , t h e f i r s t l i g h t source u n i t 6L
i s p o s i t i o n e d i n s i d e o f t h e l e f t r e c e s s e d p o r t i o n 2 G , the second
l i g h t source u n i t 6 R i s p o s i t i o n e d i n s i d e of t h e r i g h t recessed
p o r t i o n 2H, and a s described above, t h e l i g h t source u n i t s 6R
and 6L emit l i g h t along t h e p r o j e c t i o n s u r f a c e SC1.
[00401
The lower case 22 further includes a protrusion 222; a
positioning pin 223; bosses 224R, 224L, 225R, 225L, and 226;
and pins 227.
The protrusion 222 protrudes fromthe bottom surface 22A
of the lower case 22. A spring member 228 (refer to Fig. ll),
which is a biasing member, is fitted onto the protrusion 222
The spring member 228 is in contact with the bottom surface
22A and a bottom surface portion 2B-side surface of the frame
5 such that the frame 5 is biased to the pressing member 24,
which will be described in detail later.
Thepositioningpin 223isinsertedintothe hole portion
54, and positions the light curtain unit 4 (the frame 5) with
respect to the lower case 22.
Each of the bosses 224R and 224L includes a hole into
whichthe screw52 for fixingthepressingmember 24 is screwed,
and the pressing member 24 is fixed to the lower case 22 with
the frame 5 interposed between the pressing member 24 and the
lower case 22.
The bosses 226 respectively protrude at four corners of
the bottom surface 22A, and the screws S1 are respectively
inserted into the bosses 226 from the bottom surface portion
2B side. As described above, the screws S1 are screwed to the
upper case 21.
[0041]
Multiple pins 227 protrude in the vicinity of a front
surface portion 2C side of the opening portion 221 such that
themultiple pins 227 extendstraightlyfromthebottomsurface
22A to the top surface portion 2A side. Specifically, one pin
227 is respectively disposed in the vicinities of both front
surface portion 2C-side ends of one side edge of front surface
portion 2C-side end edges of the opening portion 221 having
a substantially L shape, and one pin 227 is respectively
disposed in the vicinities of both front surface portion
2C-side ends of the other side edge, that is, a total of four
pins 227 is disposed. The pins 227 serve as shock-absorbing
portions of the present invention which are positionedbetween
the bottom surface 22A and the frame 5 when the light curtain
unit 4 is accommodated inside the housing 2, and come into
contact with the frame 5 (specifically, a surface of the frame
5 on which the light source unit 6 is disposed), and suppress
contact between the light source unit 6 and the bottom surface
22A when the light emitting device 1 falls to the ground. The
pins 227 are formed integrally with the lower case 22. In the
embodiment, the pins 227 are formed at the same time the lower
case 22 is molded by injection molding or the like.
In the embodiment, a tip surface (an upper case 21-side
surface) of each of the pins 227 is formed into a flat shape.
However, the shape of the tip surface is not limited to that
shape, and the tip surface may have a protruding shape such
as a hemispherical shape, or a recessed shape.
[0042]
[Configuration of Adjustment Mechanism]
As illustrated in Figs. 6 to 9, the adjustment mechanism
7 is disposed in a portion of the frame 5 on the emission
direction side (the front surface portion 2C side) of light
emitted from the light source unit 6, and adjusts the
inclination of the frame 5 relative to the projection surface
SC1. The adjustment mechanism 7 includes a fixing member 71
disposed along the front surface portion 2C-side end portion
(end portion on the side of the emission direction of light
emitted from the light source unit 6) of the frame 5; a first
adjustment mechanism 72L positioned on a left surface portion
2E side of the end portion; and a second adjustment mechanism
72R positioned on a right surface portion 2F side. That is,
the adjustment mechanism 7 includes the first adjustment
mechanism 72L and the second adjustment mechanism 72R which
aredisposedwhilebeingspacedtherebetweenbyapredetermined
gap in a direction in which light emitted fromthe light source
unit 6 is diffused, when the frame 5 is seen in a direction
perpendicular to the projection surface SC1.
[0043]
[Configuration of Fixing Member]
The fixing member 71 is fixed to the lower case 22 such
thataportion ofthe fixing member 71 coversthe front surface
portion 2C-side end portion of the frame 5. Multiple hole
portions 711 are formed on a right surface portion 2F side and
aleft surface portion 2E side ofthe flxingmember 71. Screws
53 (refer to Fig. 6) fixed to the bosses 225R and 225L of the
lower case 22 are respectively fitted lnto the hole portions
711 such that the fixing member 71 is screw-fixed to the lower
case 22. That is, the fixing member 71 is fixed to the lower
case 22, independently from the frame 5.
[0044]
[Configuration of First Adjustment Mechanism and Second
Adjustment Mechanism]
Fig. 11 is a vertical sectional view illustrating the
lowercase 22andthe secondadjustmentmechanism72R. Inother
words, Fig. 11 is a sectional view taken along line XI-XI in
Fig. 7.
As illustrated in Figs. 8, 9, and 11, each of the first
adjustment mechanism 722 and the second adjustment mechanism
72R includes the gear 721; a shaft member 722 (refer to Figs.
9 and 11); a movlng member 723 (refer to Figs. 9 and 11).
The gear 721 is disposed on a surface 71A of the fixing
member 71 which is positioned on an upper case 21 side, and
ismountedin such a way as to be capable of being turned around
the shaft member 722 which serves as a central axis. The gear
721 of the first adjustment mechanism 72L meshes with the gear
214 of the dial 211L. The gear 721 of the second adjustment
mechanism 72R meshes with the gear 214 of the dial 211R.
100451
The shaft member 722 is screw-fixed to a substantially
central portion of the gear 721 along a central axis of the
gear 721. An end portion of the shaft member 722 opposite to
the gear 721 passes through the fixing member 71 and the frame
5.
The moving member 723 is provided in an end portion of
the shaft member 722 which passes through the frame 5. That
is, the moving member 723 is positioned on the lower case 22
side (thebottomsurfaceportion 2B side) ofthe frame 5. When
the gear 721 is turned, the moving member 723 is moved along
the central axis of the shaft member 722.
LO0461
Specifically, as illustrate din Fig. 11, the shaftmember
722 includes a screwed portion 7221 that is spirally formed
on a circumferential surface ofthe shaft member 722 along the
central axis of the shaft member 722. The moving member 723
is screwed to the screwed portion 7221 via a screwed groove
7231 that is formed in an inner surface of a hole portion
positioned at the center ofthe moving member 723. The moving
member 723 is fitted into a fitting portion 52 formed in the
frame 5 such that the moving member 723 is in contact with the
frame 5 while the turning of the moving member 723 around the
central axis ofthe shaft member 722 is limited. Accordingly,
when one of the dials 211 is turned, and the gear 721 meshing
with the gear214 ofthe dial211isturnedin either direction,
the shaft member 722 is turned according to the turning of the
gear 721. As the shaft member 722 is turned, the moving member
723 is moved to the top surface portion 2A side or the bottom
surface portion 2B side, that is, along the shaft member 722.
[00471
A disengagement prevention member 724 is mounted in the
vicinity of a tip portion (bottom surface portion 2B-side end
portion) of the shaft member 722, and prevents disengagement
of the moving member 723 from the shaft member 722.
A spring member 725 formed of a compression coil spring
is disposed at the circumference of the shaft member 722 such
that a central axis of the spring member 725 substantially
coincides with the shaft member 722. One end of the spring
member 725 is in contact wlth the fixing member 71, and the
other end is in contact with the frame 5. For this reason,
the spring member 725 presses and biases the frame 5 against
the moving member 723, and thus, the frame 5 can be reliably
moved along the central axis ofthe shaft member 722 according
to the movement of the moving member 723.
[0048]
[Adjustment of Emission Direction Performed by Adjustment
Mechanism]
Hereinafter, a m e t h o d o f a d j u s t i n g t h e e m i s s i o n d i r e c t i o n
of light emitted fromthelightsource unit 6 via the adjustment
mechanism7 will be described. In the following case, thedial
211R is operated. The method of adjusting the emission
direction by operating the dial 211L (refer to Figs. 4 and 5)
is substantially the same as that by operating the dial 211R
(refer to Figs. 4 and 5) .
[0049]
Ina state illustrate din Fig. 11,the frame 5 is disposed
parallel with the bottom surface 22A of the lower case 22. In
this state, the frame 5 is biased to the top surface portion
2A side by the spring member 228, and the tip portion of the
pivotal portion 51 is in contact with a bottom surface portion
2B-side surface of the pressing member 24. In contrast, the
protrusion 222 is not in direct contact with the frame 5. For
this reason, the frame 5 is disposed inside of the lower case
22 while having a certain degree of freedom between the
protrusion 222 and the presslng member 24. As a result, the
frame 5 1s capable of inclining around the pivotal portion 51
by the adjustment mechanism 7.
[0050]
Fig. 12 is a sectional view of the light emitting device
1 after the emission direction of light emitted from the light
source unit 6is adjustedtothe bottom surface portion 2B side
from the state illustrated in Fig. 11. In Fig. 12, a portion
of the configuration elements of the light emitting device 1
such a s t h e upper case 21 is omitted. S i m i l a r l y , a p o r t i o n
of t h e c o n f i g u r a t i o n elements i s omitted i n Fig. 13.
When a user t u r n s t h e d i a l 2 1 1 R m o u n t e d o n t h e t o p s u r f a c e
p o r t i o n 2A i n one d i r e c t i o n (clockwise or counter-clockwise
d i r e c t i o n when the d i a l 211R is seen from t h e t o p s u r f a c e
p o r t i o n 2A s i d e ) of A1 d i r e c t i o n s i n Fig. 5, t h e gear 214 i s
a l s o t u r n e d a r o u n d t h e s h a f t p o r t i o n ( s e r v i n g a s a c e n t r a l a x i s )
213 i n the same d i r e c t i o n . As d e s c r i b e d above, the gear 214
meshes with t h e gear 721. For t h i s reason, when the gear 214
is t u r n e d , t h e gear 721 is t u r n e d i n a t u r n i n g d i r e c t i o n
o p p o s i t e t o t h a t of t h e gear 214. As t h e gear 721 is turned,
t h e s h a f t member 722 is a l s o t u r n e d i n t h e same d i r e c t i o n . The
moving member 723 screwed t o t h e s h a f t member 722 i s f i t t e d
i n t o t h e frame 5. For t h i s reason, t h e moving member 723 is
rnovedtothebottomsurfaceportion 2B s i d e , and a s i l l u s t r a t e d
i n Fig. 12, t h e frame 5, which is biased t o t h e moving member
723 by t h e s p r i n g member 725, is i n c l i n e d t o t h e bottom s u r f a c e
p o r t i o n 2B s i d e around t h e p l v o t a l p o r t i o n 51 which serves a s
t h e c e n t e r ( c e n t e r of t u r n i n g ) of i n c l i n a t i o n .
[0051]
I n a case where t h e frame 5 is i n c l i n e d t o t h e bottom
s u r f a c e p o r t i o n 2B s i d e i n t h i s manner, s i m i l a r l y , t h e l i g h t
source u n i t 6 mounted on t h e frame 5 is a l s o i n c l i n e d t o t h e
bottom s u r f a c e p o r t i o n 2B s i d e , and the emission d i r e c t i o n of
l i g h t emitted from t h e second l i g h t source u n i t 6R is a l s o
inclined to the bottom surface portion 2B side. Accordingly,
arelativepositionbetweenthe layer of light (the interactive
region LE) emitted to a predetermined region along the
projection surface SC1 and the projection surface SC1 is
adjusted.
[0052]
Fig. 13 is a sectional view of the light emitting device
1 after the emission direction of light emitted from the light
source unit 6 is adjusted to the top surface portion 2A side
from the state illustrated in Fig. 11.
In contrast, when a user turns the dial 211R in the other
direction of the A1 directions in the state of the light
e m i t t i n g d e v i c e l i l l u s t r a t e d i n Fig. 11, the gear 721isturned
via the gear 214 in a turning direction opposite to that of
the dial 211R. As the gear 721 is turned, the shaft member
722 is also turned in the same direction. In contrast, as
described above, the moving member 723 is not turned in the
same direction as that of the gear 721. For this reason, as
the shaft member 722 is turned, the moving mernber 723 is moved
along the central axis of the shaft member 722 in a direction
opposite to that illustrated in Fig. 12, that is, to the top
surface portion 2A side. Accordingly, as illustrated in Fig.
13, the frame 5 biased to the moving member 723 is inclined
to the top surface portion 2A side around the pivotal portion
(serving as the center of inclination) 51 according to the
movement of the moving member 723. The emission direction of
light emitted from the second light source unit 6R is also
inclined to the top surface portion 2A side due to the
inclination of the frame 5. Accordingly, a relative position
between the layer of light (the interactive region LE) emitted
to a predetermined region along the projection surface SCland
the projection surface SC1 is adjusted.
[0053]
As describedabove, the frame 5 is biasedtothe pressing
member 24 by the spring member 228. Forthis reason, in a case
where an external impact is applied to the housing 2, for
example, the light emitting device 1 falls to the ground, the
frame 5 is moved along a direction (to the bottom surface
portion2Bside) i n w h i c h r e p e l l i n g f o r c e i s a p p l ~ e d t o o v e r c o m e
biasing force from the spring member 228. As a result, it is
considered that the light source unit 6 (the first light source
unit 6L and the second light source unit 6R) collides with the
lower case 22 (the bottom surface 22A), and is damaged.
In contrast, in a case where such an impact is applied
to the housing 2, and the frame 5 is moved to the bottom surface
portion 2B slde, the frame 5 comes into contact with the tip
portions of the multiple pins (serving as shock-absorbing
portions) 227 suchthat themovement ofthe frame 5tothebottom
surface portion 2B side is suppressed. Accordingly, contact
between the first light source unit 6L and the second light
source unit 6R mounted on the frame 5 and the lower case 22
(the bottomsurface 22A) 1s suppressed. As such, themultiple
pins 227 serve as shock-absorbing portions such that damage
to the first light source unit 6L and the second light source
unit 6R is prevented.
[0054 ]
[Adjustment of Emission Direction of Light Relative to
Projection Surface]
Fig. 14 is a schematic view illustrating the method of
adjusting the emisslon direction of light emitted from the
light source unit 6.
For example, a method of adjusting the light emitting
device 1 is performed as illustrated in Fig. 14.
A first pin P1 extending in the shape of a protrusion
is installed in a left lower end portion of the projection
screen SCl of the screen SC. Similarly, a second pin P2
extending in the shape of a protrusion is installed in a right
lower end portion of the projection screen SC1. A projection
surface SC1-side end portion of each of the first pin P1 and
the second pin P2 has a diameter greater than that of an end
portion thereof opposite to the projection surface SC1, which
is not illustrated in detail.
In contrast, the light emitting device 1 is mounted on
the wall surface WS (refer to Fig. 1) such that the central
axis of the shaft member 722 of the first adjustment mechanism
72L is p o s i t i o n e d on a s t r a i g h t l i n e T1 through which the
p i v o t a l p o r t i o n 51 provided on t h e frame 5 i s connected t o t h e
f i r s t pin PI, and t h e c e n t r a l a x i s of t h e s h a f t member 722 of
the s e c o n d a d j u s t m e n t m e c h a n i s r n 7 2 R i s p o s i t i o n e d o n a s t r a i g h t
l i n e T2 through which t h e p i v o t a l p o r t i o n 51 is connected t o
the second pin P2.
[0055]
In t h i s s t a t e , f i r s t , t h e emission d i r e c t i o n of l i g h t
e m i t t e d f r o m t h e f i r s t l i g h t s o u r c e u n i t 6 L i s a d j u s t e d r e l a t i v e
t o t h e f i r s t pin P I . S p e c i f i c a l l y , adjustment i s performed
by t u r n i n g t h e d i a l 211L such t h a t t h e dimension between t h e
l i g h t l a y e r ( t h e i n t e r a c t i v e region LE) formed by t h e f i r s t
l i g h t source u n i t 6L and t h e p r o j e c t i o n s u r f a c e SC1 becomes
approximately 1 mm i n the l e f t lower end p o r t i o n of t h e
p r o j e c t i o n s u r f a c e SC1. Since t h e p i v o t a l p o r t i o n 51, t h e
s h a f t member 722, and the second pin P2 a r e p o s i t i o n e d on t h e
s t r a i g h t l i n e T2, when t h i s adjustment is performed, it is
p o s s i b l e t o perform adjustment r e l a t i v e t o the s t r a i g h t l i n e
T2 which s e r v e s a s an a x i s . T h i s adjustment is performedbased
on a captured image obtained by t h e image c a p t u r i n g device of
t h e p r o j e c t o r PJ. That i s , s i n c e t h e f i r s t pin PI becomes
t h i n n e r f r o m t h e p r o j e c t i o n s u r f a c e S C 1 - s i d e e n d p o r t i o n t o w a r d
t h e e n d p o r t i o n t h e r e o f o p p o s i t e t o t h e p r o j e c t i o n s u r f a c e SC1,
in a c a s e where t h e d i s t a n c e between t h e l i g h t l a y e r and t h e
p r o j e c t i o n s u r f a c e SC1 i s i n c r e a s e d , t h e r e f l e c t e d p o s i t i o n
of infrared light detected in the captured image is changed
on the straight line TI. For this reason, it is possible to
properly adjust the dimension between the light layer and the
projection surface SC1 by adjusting the emission direction of
light emitted fromthe first light source unit 6L while turning
the dial 211L based on the reflected position.
[0056]
Thereafter, adjustment is performed by turning the dial
211R such that the dimension between the light layer (the
interactive region LE) formed by the second light source unit
6R and the projection surface SC1 becomes approximately 1 mm
in the right lower end portion of the projection surface SC1.
This adjustment is performed by the same method as the method
of adjusting the emission direction of light emitted from the
first light source unit 6L. Since the pivotal portion 51, the
shaft member 722, the first pin P1 are positioned on the
straight line TI, when this adjustment is performed, it is
possible to performs adjustment relative to the straight line
TI which serves as an axis.
Since, in this adjustment method, adjustment for a first
pin P1 side is performed relative tothe straight line T2 which
serves as an axis, and adjustment for a second pin P2 side is
separately performed relative to the straight line T1 which
serves as anaxis, itispossibletoeasilyadjustthedimension
betweenthelayeroflightemittedfromeach ofthe light source
units 6Rand 6L and the projection surface SClto apropervalue
with a small number of times of adjustment. That is, since
the pivotal portion 51, the shaft member 722, and the first
pin P1 are positioned on the straight line T I , and the pivotal
portion 51, the shaft member 722, and the second pin P2 are
positioned on the straight line T2, it is possible to properly
adjust the dimensions between the projection surface SC1 and
the layers of light emitted from the first light source unit
6L and the second light source unit 6R separately or
independently.
In the aforementioned description, first, the emission
direction of light emitted from the first light source unit
6L is adjusted, and then, the emission direction of light
emitted from the second light source unit 6R is adjusted.
However, the sequence of adjustments is not limited to that
sequence illustrated in the embodiment, and may be reversely
set.
[0057]
In the image display system 10 including the light
emitting device 1, the following effects can be obtained.
[0058]
Since the frame 5 is provided with the adjustment
mechanism 7 adjusting the emission direction of light emitted
from the light source unit 6, relative to the predetermined
flat surface (the projection surface SCl), it is possible to
a d j u s t t h e i n c l i n a t i o n o f t h e frame 5 o n t h e s i d e o f t h e emission
d i r e c t i o n of l i g h t , r e l a t i v e t o t h e p r o l e c t i o n s u r f a c e SC1.
Accordingly, it is p o s s i b l e t o a d j u s t t h e emission d i r e c t i o n
of l i g h t emitted from the l i g h t source u n i t 6 provided i n the
frame 5, r e l a t i v e t o t h e p r o j e c t i o n s u r f a c e SC1
Since l i g h t , which is e m i t t e d from the l i g h t e m i t t i n g
device 1 i n t h e predetermined r a n g e , can be p r o p e r l y a l i g n e d
along t h e p r o j e c t i o n s u r f a c e ( d i s p l a y s u r f a c e ) SC1, it is
p o s s i b l e t o reduce t h e d i s t a n c e between a l i g h t l a y e r ( t h e
i n t e r a c t i v e region LE) and t h e p r o j e c t i o n s u r f a c e SC1 t o a
r e l a t i v e l y s m a l l v a l u e . For t h i s reason, a u s e r can e a s i l y
perform an o p e r a t i o n ( f o r example, a double c l i c k o p e r a t i o n )
ofcontinuouslyindicating a p r e d e t e r m i n e d p o r t i o n i n an image
displayedontheprojectionsurface S C l w i t h a n i n d i c a t i o n t o o l
r e f l e c t i n g l i g h t e m i t t e d f r o m t h e l i g h t e m i t t i n g d e v i c e l , t h a t
is, an o p e r a t i o n of continuously i n s e r t i n g i n t o and removing
t h e i n d i c a t i o n t o o l f r o m t h e i n t e r a c t i v e r e g i o n L E . A s a r e s u l t ,
t h e o p e r a b i l i t y o f t h e image d i s p l a y system 1 0 canbeimproved.
[0059]
Since t h e frame 5 l n c l u d e s t h e p i v o t a l p o r t i o n 51, which
is p o s i t i o n e d o p p o s i t e t o t h e e m i s s i o n d i r e c t i o n of l i g h t with
r e s p e c t t o t h e adjustmentmechanism7, t h e adjustmentmechanism
7 is capable of r e l i a b l y a d j u s t i n g t h e i n c l i n a t i o n o f t h e frame
5 around t h e p i v o t a l p o r t i o n 51 r e l a t i v e t o the p r o j e c t i o n
s u r f a c e SC1. A s a r e s u l t , it is p o s s i b l e t o r e l i a b l y a d j u s t
the emission direction of light emitted from the light source
unit 6 provided in the frame 5, relative to the projection
surface SC1.
[0060]
It is possible to adjust the inclination of the frame
5 relative to the projection surface SC1 via the first
adjustment mechanism 72L that is positioned at one end (left
surface portion 2E side) of the frame 5 in a direction
intersecting the emission direction of light when the frame
5 is seen in the direction perpendicular to the projection
surface SC1, and via the second adjustment mechanism 72R that
ispositionedatthe other end (right surface portion 2F side).
As a result, it is possible to minutely adjust the emission
direction oflightemltted f r o m t h e l i g h t s o u r c e u n l t 6 p r o v l d e d
in the frame 5, relative to the projection surface SC1.
[0061]
When the shaft member 722, which is turnably provided
in the fixing member 71 fixed independently from the frame 5,
is turned, the moving member 723 is moved along the central
axis of the shaft member 722 such that the frame 5 is moved
along the central axis of the shaft member 722. Accordingly,
it is possible to minutely adjust the inclination of the frame
5 relative to the projection surface SC1 according to the
turning of the shaft member 722. In a case where each of the
first adjustment mechanism 72L and the second adjustment
mechanism 72R has such a configuration, it is possible to more
minutely adjust the inclination of the frame 5. As a result,
it is possible to more minutely adjust the emission direction
of light.
[0062]
It is possible to reliably move the moving member 723
in a direction along the central axis of the shaft member 722
by the turning of the shaft member 722. Accordingly, it is
possible to very minutely adjust the inclination of the frame
5 relative to the projection surface SC1. As a result, it is
possible to very minutely adjust the emission direction of
light relative to the projection surface SC1.
[0063]
The shaft portion 213, which is engaged with the
transmission member (the gear 2141, can be indirectly turned
by turning the operation member (the dial 211) by a user.
Accordingly, it is possible to adjust the incl~nation of the
frame 5 accommodated ins~det he houslng 2 by only turning the
body portion 212 provided outside of the housing 2
In a case where the shaft member 722 is directly turned,
it is considered that the frame 5 or the fixing member 71 may
be deformed due to a load applied to the shaft member 722. In
contrast, in the Light emitting device 1, the dial 211 turns
the shaft member 722 via the gear 214 such that the occurrence
of such a deformation can be suppressed.
[0064]
For example, it is possible to prevent a change in the
emission direction of light, which is caused by the
unintentional turning of the dial 211, by covering the dial
211 with the cover member (the cover 23) after ending the
adjustment of the emission direction of light.
LO0651
The recessed portion 215 is formed at the circumference
of the body portion 212 of the dial 211 in the housing 2 along
the turning direction of the dial 211. Accordingly, a space
is formed such that a user can put fingers into the space to
hold the body portion 212. As a result, the user can easily
turn the body portion 212 along the surface (the top surface
portion 2A) of the housing 2 on which the body portion 212 is
provided. Forthis reason, the user can easilytransmit force
to the body portion 212, and the inclination of the dial 211
relative to the top surface portion 2A of the housing 2 is
suppressed, and thus, it is possible to reduce a load to the
dial 211.
100661
The multiple pins 227 are disposed as shock-absorbing
portions between the frame 5 and the housing 2 (specifically,
between the frame 5 and the bottom surface 22A facing a light
source unit 6-side surface of the frame 5). Accordingly, in
a case where an impact is appliedtothe housing 2, for example,
the light emitting device 1 falls to the ground, the tip
portions of the multiple pins 227 come into contact with the
frame 5, and thus, it is possibleto suppress collisionbetween
the housing 2 and the light source unit 6. For this reason,
it is possible to maintain the inclination of the frame 5
adjustedrelativetothe projection surface SCleven after the
light emitting device 1 falls to the ground. As a result, it
ispossibletomaintainthe emissiondirectionof light emitted
from the light source unit 6 after adjustment.
The pins 227 serving as shocking-absorbing portions are
formed integrally with the housing 2 (the lower case 22). As
a result, since it is not necessary to provide separate
shock-absorbing portions, it is possible to suppress the
complexity of a manufacturing process of the light emitting
device 1, and a manufacturing cost increase.
LO0671
[Modification Example]
The present invention is not limited to the embodiment,
and includes modifications, improvements, or the like insofar
as an object of the present invention can be achieved by the
modifications, the improvements, or the like.
In the embodiment, the light emitting device 1 includes
the first light source unit 6L and the second light source unit
6R. However, the present invention is not limited to this
configuration. That is, the number of light source units may
be one, or three or greater. Similarly, the light emitting
device 1 includes the adjustment mechanism 7 including the
first adjustment mechanism 72L and the second adjustment
mechanism 72R; however, the present invention is not limited
to this configuration. That is, only one of the first
adjustment mechanism 72L and the second adjustment mechanism
72R may be provided. In this case, disposition of the
adjustment mechanism can be properly changed.
[0068]
In the embodiment, the light emitting device 1 forms one
interactive region LE (that is, one light layer). However,
the present invention is not limited to this configuration.
That is, multiple light layers may be formed to overlap each
other. Inthis case, thewavelengthoflightformingeachlayer
may be changed. In thls configuration, it is possible to know
the number of layer sinto which an indication tool is inserted,
and to detect the height position of the indication tool or
the like with respect to the projection surface.
[0069]
In the embodiment, the housing 2 of the light emitting
device 1 includesthe cover 23; however, the present invention
is not limited to this configuration. Any configuration may
be adopted insofar as the unintentional operation of the dial
211 can be prevented after the emission direction of light
emitted from the light source unit 6 of the light emitting
device 1 is adjusted. For example, a lock function may be
provided to fix the dial 211. That is, the cover 23 may be
not provided.
[0070]
In the embodiment, the gear 214 of the dial 211 meshes
with gear 721; however, the present invention is not limited
to this configuration. For example, one gear may be further
provided between the gear 721 and the gear 214. Accordingly,
the turning direction of the dial 211 when a user operates the
dial 211 coincides with the turning direction of the shaft
member 722, and it is possible to more easily adjust the
emission direction of light emitted from the light source unit
6.
In the embodiment, the spring member 725 is provided in
each of the shaft members 722, and the spring member 228 is
provided in the protrusion 222 of the lower case 22. However,
the present invention is not limited to this configuration.
That is, anytypeofmembermaybeprovidedinsofaras themember
has biasing force, and the spring member is not limited to a
coil spring.
[0071]
In the embodiment, the pivotal portion 51, which serves
as a pivot when the inclination of the frame 5 is adjusted by
theadjustmentmechanism7, isdisposedinthe frame5. However,
the present invention is not limited to this configuration.
For example, the pivotal portion 51 may be provided in the
housing 2 (for example, the upper case 21).
A hemispherical pivotal portion may be provided on a
surface of the pressing member 24 which faces the frame 5, and
the frame 5 may be in contact with the pivotal portion.
A tip portion of the protrusion 222 may be formed into
a hemispherical shape, anda pressingmemberbiasedbybiasing
means may press the frame 5 such that the frame 5 comes into
contact with the tip portion.
[0072]
In the embodiment, the multiple pins 227 serving as
shock-absorbing portions are provided on the front surface
portion 2C side of the opening portion 221. However, the
present invention is not limited tothis configuration. That
is, the number of pins 227 can be properly set. For example,
the pins 227 may be respectively provided on a first light
source unit 6L side and a second light source unit 6R side,
or one pin 227 may be provided. The position of disposition
of the pin 227 can be properly changed.
The tip portion (surfaces coming into contact with the
frame 5) of each of the multiple pins 227 serving as
shock-absorbing portions are formed into the shape of a flat
surface. However, thepresent inventionis not limitedtothis
configuration. For example, the tipportionmaybe formedinto
either of a recessed shape and a protruding shape. In a case
where the t i p p o r t i o n has a r e c e s s e d shape, t h e t h i c k n e s s of
the t i p p o r t i o n , which is deformed when coming i n t o c o n t a c t
with t h e frame 5, is small. Accordingly, it is p o s s i b l e t o
deform t h e t i p p o r t i o n e a s i e r than a t i p p o r t i o n having a
p r o t r u d i n g shape. As a r e s u l t , t h e t i p p o r t i o n i s capable of
e a s i l y absorbing an impact by deformation. I n a d d i t i o n , it
ispossibletoincreasethearea o f a t i p p o r t i o n . Accordingly,
it i s p o s s i b l e t o f u r t h e r absorb an impact a p p l i e d t o the
housing 2 when t h e l i g h t e m i t t i n g device 1 f a l l s t o t h e ground.
The pin 227 has a shape extending s t r a i g h t l y from the
b o t t o m s u r f a c e ( f l a t s u r f a c e ) 2 2 A o f t h e l o w e r c a s e 2 2 ; h o w e v e r ,
t h e shape of t h e pin 227 can a l s o be p r o p e r l y changed, and the
pins 227 may not be formed i n t e g r a l l y with t h e lower case 22
( t h e housing 2 ) . E l a s t i c b o d i e s such a s c o i l s p r i n g s or rubber
may be provided i n s t e a d of t h e p i n s 227 or i n a d d i t i o n t o the
pins 227.
[0073]
In t h e embodiment, t h e s c r e e n SC forms t h e p r o j e c t i o n
s u r f a c e SC1; however, a whiteboard may form t h e p r o j e c t i o n
s u r f a c e SC1. In t h i s case, t h e l i g h t e m i t t i n g device 1 may
be mounted on t h e same wall s u r f a c e on which t h e whiteboard
ismounted. In a casewhere a f r e e s t a n d i n g w h i t e b o a r d is used,
t h e l i g h t e m i t t i n g device 1 may be d i r e c t l y mounted on t h e
whiteboard. In a casewhere t h e p r o j e c t o r P J p r o j e c t s an image
o n t o a w a l l s u r f a c e without using t h e screen SC, t h e l i g h t
emitting device 1 may be disposed to use the wall surface as
a projection surface (predetermined flat surface).
[0074]
In the embodiment, the image capturing device CM forming
a detection device is provided in the projector PJ; however,
the present invention is not limited to this configuration.
That is, the projector and the image capturing device may be
separate devices
The image generation device GN detects the indicated
positions of an indicated tool operated by a user, based on
a captured image obtained by the image capturing device.
However, the present invention is not limited to this
configuration. The image capturing device may be configured
to detect indicated positions on the projection surface SCI
via the projector PJ, to analyze the coordinates of the
indicated positions in an image display region on the
projection surface SC1, and to transmit the coordinates to the
image generation device GN.
In the image display system 10, the projector PJ is
provlded as a display device, and the projection surface SC1
of the screen SC, on which an image is projected and displayed
by the projector PJ, is a predetermined flat surface of the
present invention. However, the present invention is not
limited to this configuration. For example, various devices
such as a liquid crystal display, a plasma display, and an
organic electro-luminescence (EL) may be adopted instead of
the projector PJ and the screen SC. In this case, a display
surface of the device may be used as a predetermined flat
surface of the present invention.
Reference Signs List
[00751
1: LIGHT EMITTING DEVICE
2: HOUSING
5: FRAME
6: LIGHT SOURCE UNIT
7: ADJUSTMENT MECHANISM
10: IMAGE DISPLAY SYSTEM
21: UPPER CASE
22: LOWER CASE
23 : COVER
51: PIVOTAL PORTION
71: FIXING MEMBER
72L: FIRST ADJUSTMENT MECHANISM
72R: SECOND ADJUSTMENT MECHANISM
73: MOVING MEMBER
211: DIAL
213: SHAFT PORTION
214, 721: GEAR
215: RECESSED PORTION
227: PIN (SHOCK-ABSORBING PORTION)
722: SHAFT MEMBER
CM: IMAGE CAPTURING DEVICE (DETECTION DEVICE)
GN: IMAGE GENERATION DEVICE (DETECTION DEVICE, IMAGE
GENERATION DEVICE)
PJ: PROJECTOR (DISPLAY DEVICE)
SC1: PROJECTION SURFACE (PREDETERMINED FLAT SURFACE,
DISPLAY SURFACE)

We Claim: -
[Claim 11
A light emitting device comprising:
a light source unit that emits light to a region along
a predetermined flat surface;
a frame in which the light source unit is provided; and
an adjustment mechanism that adjusts an emission
directionof light emitted fromthelight sourceunit, relative
to the predetermined flat surface.
[Claim 21
The light emitting device according to claim 1,
wherein the frame includes a pivotal portion, and
wherein the adjustment mechanism adjusts the emission
direction of light by adjusting the inclination of the frame
around the pivotal portion relative to the predetermined flat
surface.
[Claim 31
The light emitting device according to claim 2,
wherein the pivotal portion is positioned opposite to
the emission direction of light with respect tothe adjustment
mechanism, and
wherein the adjustment mechanism includes a first
adjustment mechanism and a second adjustment mechanism which
areprovidedinaportionofthe frameonthe side ofthe emission
direction of light, and are disposed while being spaced
therebetween in the emission direction of light when seen from
a direction perpendicular to the predetermined flat surface.
[Claim 41
The llght emitting device according to claim 3,
whereinatleasteltherofthe first adjustmentmechanism
and the second adjustment mechanism includes:
a fixing member that is disposed along an end portion
of the frame in the emission direction of light, and is fixed
independently from the frame;
a shaft member that is turnably provided in the fixing
member; and
a moving member which is engaged with the shaft member,
and is moved along a central axis of the shaft member such that
the frame is moved along the central axis.
[Claim 51
The light emitting device according to claim 4,
wherein the shaft member includes a screwed portion that
is spirally formed on a circumferential surface of the shaft
member along the central axis, and is screwed to the moving
member, and
wherein the moving member is in contact with the frame
in a state where the turning of the moving member around the
central axis is limited.
[Claim 61
The light emitting device according to claim 5, further
comprising:
a housing that accommodates the light source unit, the
frame, and the adjustment mechanism thereinside,
wherein the fixingmember is fixed inside ofthe housing,
and
wherein the housing includes an operation member which
ispositionedoutside ofthehousing, andis turnably supported
by the housing, and a transmission member which includes a
turning axis coaxial with that of the operation member, and
is engaged with the shaft member such that the shaft member
is turned by the turning of the operation member.
[Claim 71
The light emitting device according to claim 6,
wherein the housing includes a cover member covering the
operation member.
[Claim 81
The light emitting device according to claim 6 or 7,
wherein the housing includes a recessed portion that is
positioned at the circumference of the operation member, and
is formed along a turning direction of the operation member.
[Claim 91
The light emitting device according to any one of claims
6 to 8, further comprising:
a shock-absorbing portion which is positioned between
the housing and the frame, and, when the light emitting device
falls to the ground, which comes into contact with the frame
such that contact between the light source unit provided in
the frame and the housing is suppressed.
[Claim 101
The light emitting device according to claim 9,
wherein the shock-absorbingportion is formedintegrally
with the housing.
[Claim 111
An image display system comprising:
a display device that displays a received image;
the light emitting device according to any one of claims
1 to 10 which emits light to a region along a display surface
onwhich the image is displayedbythedisplaydevice, and forms
a light layer along the display surface;
a d e t e c t i o n device that detects the reflected positions
of light , which is emitted from the light emitting device, in
the region; and
an image generation device that generates an image
according to a detected result obtained by the detection device,
and transmits the image to the dis play device.