Description:FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[SEE SECTION 10, RULE 13]

HEAD MOUNTED DISPLAY (HMD) APPARATUS HAVING ADJUSTABLE TEMPLES;

TESSERACT IMAGING LIMITED, A CORPORATION ORGANISED AND EXISTING UNDER THE LAWS OF INDIA, WHOSE ADDRESS IS-5 TTC INDUSTRIAL AREA, RELIANCE CORPORATE IT PARK, THANE BELAPUR ROAD, GHANSOLI, NAVI MUMBAI, MAHARASHTRA – 400 701, INDIA

THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

FIELD OF THE INVENTION
[0001] The present invention relates to Head Mounted Display (HMD) apparatus, and more particularly relates to the Head Mounted Display (HMD) apparatus having adjustable temples.
BACKGROUND OF THE INVENTION
[0002] In general, a wearable display apparatus such as, a head mounted device includes a main frame and two temples. A coupling means such as a spring unit couples the two temples to the main frame. The head mounted device may further include a display panel and optical system that are housed in the main frame. In addition, the main frame may also include sensors to capture head pose and cameras to capture pictures and/or videos. Therefore, the head mounted device may be bulky and in turn weighs more than a normal eye glass.
[0003] Further, the head mounted device usually has a size fit issue. In particular, the head mounted device usually has a standard size and therefore does not provide a comfortable fit to users due to variance in head sizes.
[0004] Further, while wearing such head mounted device, if the user is involved in performing any activity that involves brisk head movement, due to the weight of the head mounted device, the temple member may fail to keep the head mounted device in a stable position, thereby disturbing the viewing ability of the user.
[0005] In view of the above, there is a dire need for a head mounted device which provides a secured fit.
SUMMARY OF THE INVENTION
[0006] One or more embodiments of the present invention, provides a Head Mounted Display (HMD) apparatus.
[0007] In one aspect of the invention, a Head Mounted Display (HMD) apparatus is provided. The apparatus comprises a main frame. The apparatus further comprises two temples, each temple has a first portion and a second portion, the second portion is flexible. The apparatus further comprises means for coupling the first portion of each temple of the two temples to a respective end of the main frame. When the apparatus is worn by a user, the means for coupling is adapted to, angularly displace each temple with respect to the main frame. The angular displacement between a longitudinal axis of the temple and a transverse axis of the main frame depends on a width of a forehead of the user. The means for coupling also exerts a lateral force on the temple to enable the temple to angularly retract inwards with respect to the frame, thereby providing a secured fit.
[0008] Other features and aspects of this invention will be apparent from the following description and the accompanying drawings. The features and advantages described in this summary and in the following detailed description are not all-inclusive, and particularly, many additional features and advantages will be apparent to one of ordinary skill in the relevant art, in view of the drawings, specification, and claims hereof. Moreover, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter, resort to the claims being necessary to determine such inventive subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Reference will be made to embodiments of the invention, examples of which may be illustrated in the accompanying figures. These figures are intended to be illustrative, not limiting. The accompanying figures, which are incorporated in and constitute a part of the specification, are illustrative of one or more embodiments of the disclosed subject matter and together with the description explain various embodiments of the disclosed subject matter and are intended to be illustrative. Further, the accompanying figures have not necessarily been drawn to scale, and any values or dimensions in the accompanying figures are for illustration purposes only and may or may not represent actual or preferred values or dimensions. Although the invention is generally described in the context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
[0010] FIG. 1 illustrates a top view of a head mounted display (HMD) apparatus in an open position, according to one or more embodiments of the present invention;
[0011] FIG. 2 is an exemplary illustration of a side view of each temple of the apparatus of FIG. 1, according to one or more embodiments of the present invention;
[0012] FIG. 3a is an exemplary illustration of means for coupling of the apparatus of FIG. 1, according to one or more embodiments of the present invention;
[0013] FIG. 3b is an exemplary illustration of two springs embedded in the means for coupling of FIG. 3a, according to one or more embodiments of the present invention;
[0014] FIG. 3c is an exemplary illustration of a spring forming part of the means for coupling of FIG. 3a, according to one or more embodiments of the present invention;
[0015] FIG. 4 is an exemplary illustration of specifications of each spring of the means for coupling of FIG. 3a, according to one or more embodiments of the present invention;
[0016] FIG. 5a illustrates an example of an ideal fitted apparatus of FIG. 1 on a user, according to one or more embodiments of the present invention; and
[0017] FIG. 5b is an exemplary illustration of frictional forces acting on one or more contact surfaces of a user when the apparatus of FIG. 1 is worn by the user, according to one or more embodiments of the present invention;
[0018] FIG. 6a is an exemplary illustration of a ratchet and pawl mechanism coupled to the means for coupling of FIG. 3a; and
[0019] FIG. 6b and FIG. 6c are exemplary illustrations of movement of the ratchet and pawl mechanism of FIG. 6a in clockwise and counter-clockwise directions, respectively.
DETAILED DESCRIPTION OF THE INVENTION
[0020] Reference will now be made in detail to specific embodiments or features, examples of which are illustrated in the accompanying drawings. Wherever possible, corresponding or similar reference numbers will be used throughout the drawings to refer to the same or corresponding parts. References to various elements described herein, are made collectively or individually when there may be more than one element of the same type. However, such references are merely exemplary in nature. It may be noted that any reference to elements in the singular may also be construed to relate to the plural and vice-versa without limiting the scope of the invention to the exact number or type of such elements unless set forth explicitly in the appended claims. Moreover, relational terms such as first and second, and the like, may be used to distinguish one entity from the other, without necessarily implying any actual relationship or between such entities.
[0021] Various embodiments of the invention provide a Head Mounted Display (HMD) apparatus having adjustable temples. The present invention is adapted to provide a secured fit when worn by the user.
[0022] In one aspect of the invention, a Head Mounted Display (HMD) apparatus is provided. The apparatus comprises a main frame. The apparatus further comprises two temples, each temple has a first portion and a second portion, the second portion is flexible. The apparatus further comprises means for coupling the first portion of each temple of the two temples to a respective end of the main frame. When the apparatus is worn by a user, the means for coupling is adapted to, angularly displace each temple with respect to the main frame. The angular displacement between a longitudinal axis of the temple and a transverse axis of the main frame depends on a width of a forehead of the user. The means for coupling also exerts a lateral force on the temple to enable the temple to angularly retract inwards with respect to the frame, thereby providing a secured fit.
[0023] In view of the above, below indicated are few of the technical advantages/technical effects derived from the same.
[0024] The apparatus provided above may be utilized for viewing content in a two-dimensional space. Further, the apparatus may be used to view content in a three-dimensional space such as, in an Extended Reality (XR) environment.
[0025] In an embodiment, when the apparatus is worn by the user, depending on the width of the forehead of the user, a force may be exerted by the forehead on the apparatus. Due to the force, the means for coupling is adapted to angularly displace each temple outwards with respect to the main frame. Advantageously, the apparatus may be used by users with varying head sizes.
[0026] Further, in response to the angular displacement of the temple outwards with respect to the main frame, the means for coupling is adapted to exert a lateral force on the temple to enable the temple to angularly retract inwards with respect to the main frame. Advantageously, the means for coupling provides a secured fit of the apparatus on the user’s head, thereby providing enhanced comfort to the user.
[0027] It is to be noted that the above indicated technical advantages/technical effects are purely exemplary in nature and should nowhere be construed as limiting the scope of the present invention.
[0028] Fig. 1 illustrates a Head Mounted Display (HMD) apparatus 100 (hereinafter referred to “the apparatus”), according to one or more embodiments of the present invention. It is to be noted that the apparatus 100 illustrated in Fig. 1 should not be construed as limiting the scope of protection to just HMD apparatus in the present disclosure.
[0029] In an embodiment, the apparatus 100 includes a main frame 102, two temples 104 and means for coupling 106.
[0030] In an embodiment, when the apparatus 100 is worn by a user, the main frame 102 is adapted to surround the eyes of the user. Further, the main frame 102 is adapted to house at least a viewing lens and a display element (not shown).
[0031] In an embodiment, the viewing lens is housed in the main frame 102 such that it is arranged at a pre-defined distance in front of the eyes of the user, when the apparatus 100 is worn by the user.
[0032] The apparatus 100 further includes two temples 104. The two temples 104 of the apparatus 100 are the long stems that connect the main frame 102 of the apparatus 100 to the back of the head of the user, i.e., just behind the ears of the user.
[0033] Fig. 2 is an exemplary illustration of a side view of each temple 104 of the apparatus 100.
[0034] In an embodiment, each temple 104 includes a first portion 108 and a second portion 110 extends from a distal end of the first portion 108.
[0035] In an embodiment, the second portion 110 is made of a flexible material, therefore the second portion 110 of each temple 104 is flexible in nature.
[0036] In an embodiment, the first portion 108 of each temple 104 is made of polycarbonate material.
[0037] Further, the second portion 110 of each temple 104 is made of at least one of, Thermoplastic Polyurethane (TPU), Thermoplastic elastomers (TPE) and a combination thereof.
[0038] As shown in Fig. 2, the temple 104 is slightly bent 202 downward at an angle which is in a range of 15 to 45 degrees.
[0039] In an embodiment, the bent 202 is at a point just beyond the top of the ear. The portion of the temple 104 which extends beyond the bent 202 is the second portion 110. In this regard, the portion of the temple 104 before the bent 202 is preferably the first portion 108.
[0040] In an embodiment, the second portion 110 of the temple 104 is at least one-third of a total length of each temple 104. In this regard, the first portion 108 is at least two third of the total length of each temple 104.
[0041] In a preferred embodiment, the second portion 110 is of a length ranging between 30-50 mm, due to which the second portion 110 extends beyond the ears advantageously providing additional grip when worn by the user.
[0042] In an embodiment, the first portion 108 is cojoined to the second portion 110 by at least one of, moulding.
[0043] In an embodiment, a user head facing surface of each temple 104 is made up of a material which doesn’t irritate the skin of the user or cause any skin allergy.
[0044] In an embodiment, each temple 104 is adapted to house components including at least, speakers, video System on Chip (SOC) and wiring.
[0045] Further, an outer surface of each temple 104 is coated with moisture resistant material. Advantageously ensuring that the apparatus 100 can firmly grip the head of the user.
[0046] In an embodiment, the means for coupling 106 is adapted to couple a proximal end 112 of the first portion 108 of each respective temple 104 to respective ends 114a, 114b of the main frame 102.
[0047] In an embodiment, when the apparatus 100 is not worn, the means for coupling 106 is adapted to allow each temple 104 to be opened and closed against the main frame 102 on its posterior side.
[0048] When the apparatus 100 is required to be worn, the means for coupling 106 allows the two temples 104 to be opened against the main frame 102 (open position) as shown in Fig. 1. When the apparatus 100 is in the open position, and still not worn by the user, the temple 104 is ideally at an angle of 90 degrees with respect to the main frame 102, considering no force is acting on the apparatus 100. Once the apparatus 100 is in the open position, the user using the two temples 104 may wear the apparatus 100 around the user’s head by directing the temples 104 to be placed above the user’s ears.
[0049] In a preferred embodiment, the means for coupling 106 is a spring-loaded hinge unit 302. The spring-loaded hinge unit 302 pivotally couples respective temples 104 to respective ends 114a and 114b of the main frame 102.
[0050] In an alternate embodiment, the means for coupling 106 includes a cam arrangement.
[0051] The spring-loaded hinge unit 302 is as shown in Fig. 3a. As seen, the spring-loaded hinge unit 302 includes two linear spring coils 310, 312, i.e., spring 1 and spring 2, respectively. Each of the springs 1 and 2 has a spring constant, i.e., k1 and k2, respectively as shown in Fig. 3b. These respective spring constants k1 and k2 represent a specific stiffness value. Further, the spring-loaded hinge 302 generally includes a hinge eye and at least one locking element.
[0052] In an alternative embodiment, the spring-loaded hinge unit 302 may have just one spring or more than two springs.
[0053] In an embodiment, the spring-loaded hinge unit 302 is part of the first portion 108 of the temple 104. Further, the spring-loaded hinge unit 302 may be either placed on the temple 104 or within the temple 104.
[0054] In an alternate embodiment, the spring-loaded hinge unit 302 is a separate entity which couples the main frame 102 to the temple 104.
[0055] As shown in Fig. 3a, two locking elements 304, 306 are provided on the spring-loaded hinge unit 302 to couple the respective temples 104 having the spring-loaded hinge unit 302 to the respective ends 114a, 114b of the main frame 102 by using fasteners through the two locking elements 304, 306.
[0056] In an alternate embodiment, in case just the spring-loaded hinge unit 302 is considered as a separate entity, then the spring-loaded hinge unit 302 is coupled to the respective ends 114a, 114b of the main frame 102 using fasteners and the two locking elements 304, 306 and the opposite end of the spring-loaded hinge unit 302 is coupled to the proximal end 112 of the first portion 108 of each temple 104 using fasteners.
[0057] In an embodiment, the fasteners to couple the spring-loaded hinge unit 302 to the main frame 102 include screws, nuts, bolts, etc.
[0058] Once the apparatus 100 is worn by the user, the means for coupling 106 is adapted to angularly displace each temple 104 with respect to the main frame 102. In an embodiment, the angular displacement between a longitudinal axis 116 of the temple 102 and a transverse axis 118 of the main frame 102 depends on a width of a forehead of the user as shown in Fig. 1.
[0059] In an embodiment, the means for coupling 106 is adapted to angularly displace 122 each temple 104 with respect to the main frame 102 in the range of 90 to 120 degrees based on the width of the forehead of the user. In particular, when the apparatus 100 is worn by the user, the width of a forehead of the user exerts a force 120 on the means for coupling 106, due to which, the means for coupling 106 displaces the temple angularly between the range of 90 to 120 degrees. For example, the apparatus 100 is generally designed having a pre-defined width between the respective ends 114a and 114b of the main frame 102. The reason being, the apparatus 100 may have been designed considering the width of a forehead of an average person.
[0060] The width of the forehead of the average person may be determined by collecting measurements of foreheads of people belonging to a particular territory or region. For example, as per data, North Europeans have larger forehead than South Europeans. Accordingly, the apparatus 100 may be designed to have the pre-defined width between the respective ends 114a and 114b of the main frame 102. The pre-defined width between the respective ends 114a and 114b is usually considered as the measurement for designing the main frame 102, since the main frame 114 is the part of the apparatus 100 which makes contact with the forehead of the user to allow the user to view via the viewing lens. Therefore, when the apparatus 100 is worn by the user, if the width of the forehead of the user is larger compared to the pre-defined width between the respective ends 114a and 114b of the main frame 102, a force 120 is exerted on the means for coupling 106 by the said forehead of the user. Due to which, the means for coupling 106 such as the spring-loaded hinge unit 302 having the two springs expand as shown in Fig. 3b and Fig. 3c. Due to the expansion of the springs in the spring-loaded hinge unit 302, each temple 104 coupled to the same is angularly displaced 122 between 90-120 degrees depending on the width of the forehead of the user.
[0061] In an embodiment, the range of expansion of each of the two springs in the spring-loaded hinge unit 302 depends on the specification of each spring that is selected, which is detailed below in the present disclosure.
[0062] Further, while the springs of the spring-loaded hinge unit 302 are in the expanded state, they are further adapted to exert a lateral force 124 on each temple 104 to enable the temple 104 to angularly retract inwards with respect to the main frame 102. In particular, the spring-loaded hinge unit 302 exerts the lateral force 124 on each temple 104, since the two springs, which are in the expanded state will try to return to the normal state from the expanded state. In an embodiment, the normal state of each spring is a condition, that is neither expanded nor compressed. While each of the two springs of the spring-loaded hinge unit 302 tries to return to the normal state from the expanded state, the lateral force 124 generated therein is transferred to each temple 104, thereby retracting each temple angularly inwards with respect to the main frame 102. Due to the retraction of each temple, ensures that the apparatus 100 provides a secured fit on the head of the user.
[0063] In an embodiment, the means for coupling 106 exerts the lateral force 124 in response to the force 120 exerted by the width of the forehead on the temple 104.
[0064] In a preferred embodiment, the means for coupling 106 angularly displaces 122 the temple 104 outwards based on the width of the forehead and also exerts a lateral force to enable the temple 104 to angularly retract inwards, due to an extent of flexion of the second portion 110 of the temple 104 being greater than an extent of flexion of the means for coupling 106. In other words, stiffness of the means for coupling 106 is greater than stiffness of the second portion 110 of the temple 104. On the contrary, If the extent of flexion is more compared to the extent of flexion of the second portion 110 of each temple 104, the surface contact of the second portion 110 of the temple 104 with the head is reduced and thus frictional force exerted on the temple 104 is reduced leading to improper or loose fitment.
[0065] Due to the extent of flexion of the second portion 110 of the temple 104 being greater than an extent of flexion of the means for coupling 106, advantageously improves the overall conformity of the apparatus 100 on the user’s head.
[0066] In an embodiment, the spring-loaded hinge unit 302 having specific specifications are selected based on the range of angular displacement 122 required of each temple 104 with respect to the main frame 102. In a preferred embodiment, in order to ensure the means for coupling 106, herein the spring-loaded hinge unit 302 is adapted to angularly displace each temple with respect to the main frame in the range of 90 to 120 degrees, the spring-loaded hinge unit 302 is selected having the below specifications and also as shown in Fig. 4:
- Diameter of sprig wire: 0.5 mm;
-Outer Diameter of spring, i.e., outer diameter of spring 1 and spring 2 respectively: 2.6 mm;
-Free length of spring: 9.5 mm;
-Number of active coils 10;
-Young Modulus of material, E: 200 GPa;
-Position ratio of material: 0.3;
-Density of material: 7500 kg/meter cube;
-Spring constant, i.e., k1 and k2: 6490 N/m, k combined= 12980 N/m
-Maximum load possible, Fmax: 22.7 N/m
-Maximum sheer stress possible: 1340 Mpa;
-Maximum displacement possible: 3.50 mm;
-Length of wire required to make spring: 79.8 mm;
-Solid height: 6 mm;
-Distance between coils in free spring: 98.8 mm;
-Rise angle of coils: 8.19 degrees;
-Lowest spring resonant frequency: 3710 HZ;
-Shear modulus of material: 76.9 Gpa; and
-Mass of spring: 1.18 X 110-4 Kg.
[0067] Taking into consideration, the above indicated specifications of the spring-loaded hinge unit 302, total displacement in each spring is calculated using the equation 1:
-Total displacement in each spring = x + ???,
wherein ??? = 0.35mm spring displacement length at 7 degrees temple retraction;
wherein x= 2.8 mm initial pretension in the spring at 0 degrees temple retraction.
Therefore, the total displacement in each spring in the preferred embodiment is 3.15mm = 0.00315m.
[0068] Further, the force on the hinge ‘Fhinge’ is calculated using the equation 2:
-??h????????= ??????????. (x+???),
??h????????= 12980 N/m x 0.0315m=40.887??
[0069] Based on the ??h???????? value, the displacement that the means for coupling 106, i.e., the spring-loaded hinge unit 302 may produce is calculated based on the equation 3:
- ??h????????= ??h???????? x 3.5mm
Wherein 3.5 mm is the total displacement 308 in each spring.
[0070] Therefore, the specifications of the spring-loaded hinge unit 302 may beneficially be selected based on the desired displacement range required of the temple 104.
[0071] In an embodiment, the second portion 110 of each temple 104 which is flexible, flexes to grip a head of a user. In particular, the second portion 110 of each temple 104 is adapted to flex on an ear of a user, thereby fit on the ear. Further, depending on the contour of a rear portion of the head of the user, the second portion 110 extends beyond the ears and flexes to grip on the rear portion of the head. By doing so, the second portion 110, applies slight comfortable pressure against the rear portion of the head and therefore a frictional force is created on the rear portion, thereby providing a secured fit of the apparatus 100. Advantageously, irrespective of the weight of the apparatus 100 or the kind of task performed by the user while wearing the apparatus, the second portion 110 ensures that the apparatus is securely fit on the user’s head.
[0072] Further, the thickness of each temple 104 varies from the first portion 108 to the second portion 110. Advantageously, the varied thickness between the first portion 108 to the second portion 110 aids in providing a better grip on the head of the user. In an alternate embodiment, thickness of each temple 104 does not vary from the first portion to the second portion, and thus the thickness each temple 104 remains constant throughout the length of the temple.
[0073] Fig. 5a illustrates an example of an ideal fitted apparatus 100 when worn by the user. As shown in Fig. 5a, the ideal fitted apparatus should form a fitting triangle between the temples 104 and the main frame 102. To ensure that the apparatus 100 is forming the fitting triangle, appropriate frictional force should be present at different contact surfaces of the apparatus 100 with the user. In a preferred embodiment, as shown in Fig. 5b, the first frictional force being when there is contact between a bottom of each temple 104 and top of the ear, termed as ‘F1’. Further, the second frictional force being when there is contact between a side of each temple and side of the head of the user, termed as ‘F2’. The third frictional force being when there is contact between nose pads and the nose termed as ‘F3’. These frictional forces provide friction on the above indicated contact surfaces, thereby supports the apparatus 100 on a face of the user. Further, since each temple 104 of the apparatus 100 houses electrical components, the weight of each temple 104 is more compared to the temples of exiting normal eye wears. Further, since the outer surface of each temple 104 is coated with moisture resistant material, this material provides friction to each temple.
[0074] Therefore, the combination of the frictional forces ‘F1-F3’, the nose pad, weight of each temple, the moisture resistant material coated on each temple 104, the ability of the means for coupling 106 to angularly displace the temples 104 outwards and also angularly retract each temple 104 inwards, the ability of the second portion 110 to grip and the overall design of the apparatus 100, advantageously ensure that the apparatus 100 doesn’t slip forward and thereby forms the fitting triangle. Further, these indicated mechanisms of the apparatus 100, ensure that there is no un-intended gap between the apparatus 100 and the skull of the user, when the apparatus 100 is worn by the user. Advantageously, due to absence of gap between the apparatus 100 and the skull of the user, ensures that the apparatus 100 grips the user firmly, thereby providing an enhanced comfort fit to the user.
[0075] In an embodiment, the means for coupling 106 in addition to the spring-loaded hinge unit 302 may include a ratchet and pawl mechanism as shown in Fig. 6a, which enables each temple 104 to be displaced vertically in either direction relative to a plane of the main frame 102. A first end 602 of the spring-loaded hinge unit 302 may be fixed on a ratchet wheel 606 and a second end 604 of the spring-loaded hinge unit 302 is coupled to the proximal end 112 of the first portion 108 of each temple 104. The ratchet wheel 606 may mate with a concentric shaft 608 enabling relative motion between the first end 602 of the spring-loaded hinge unit 302 and the main frame 102. A spring 610 loaded pawl 612 may restrict the motion of the ratchet wheel 606 at several specified angles in both clockwise direction as shown in Fig. 6b or counter clockwise direction as shown in Fig. 6c. The maximum rotation of the ratchet wheel 606 may be restricted by using a stopper placed on the ratchet wheel 606. It will be appreciated that the vertical displacement of each temple 104 enables a user to adjust a position of the apparatus 100 such that user is provided with a suitable viewing angle. Such vertical displacement of each temple 104 may advantageously help in activities such as playing games using the apparatus 100.
[0076] In an alternate embodiment, the means for coupling 106 in addition to the spring-loaded hinge unit 302 may include a gear arrangement to enable each temple 104 to be displaced vertically in either direction relative to a plane of the main frame 102.
[0077] In yet another alternate embodiment, the means for coupling 106 in addition to the spring-loaded hinge unit 302 may include a cam assembly to enable each temple 104 to be displaced vertically in either direction relative to a plane of the main frame 102.
[0078] Further, a sling 204 is coupled to a distal end 206 of the second portion 110 of each temple 104. In an embodiment, two separate slings are provided, i.e., one sling for each temple 104 and when the apparatus 100 is worn by the user, each sling is coupled to the other sling. In alternate embodiment, a single sling 204 is provided for both the temples 104 such that the sling 204 from one temple 104 may be coupled to the other temple 104. The sling 204 provides an additional support to prevent the apparatus 100 from slipping from the originally fitted position and also ensures that the apparatus 100 does not fall due to gravity.
[0079] While aspects of the present invention have been particularly shown and described with reference to the embodiments above, it will be understood by those skilled in the art that various additional embodiments may be contemplated by the modification of the disclosed machines, systems and methods without departing from the scope of what is disclosed. Such embodiments should be understood to fall within the scope of the present invention as determined based upon the claims and any equivalents thereof.
, Claims:CLAIMS:
We Claim:
1. A head mounted display (HMD) apparatus, the apparatus comprising:
a main frame;
two temples, each temple having a first portion and a second portion, wherein the second portion is flexible; and
means for coupling the first portion of each temple to a respective end of the main frame,
wherein, when the apparatus is worn by a user, the means for coupling is adapted to:
angularly displace each temple with respect to the main frame, wherein the angular displacement between a longitudinal axis of the temple and a transverse axis of the main frame depends on a width of a forehead of the user, and
exert a lateral force on the temple to enable the temple to angularly retract inwards with respect to the main frame, thereby providing a secured fit.

2. The apparatus as claimed in claim 1, wherein, when the apparatus is worn by a user, the angular displacement of each temple with respect to the main frame is in a range of 90 to 120 degrees, based on the width of the forehead of a user.

3. The apparatus as claimed in claim 1, wherein the second portion is at least one third of the total length of each temple.

4. The apparatus as claimed in claim 1, wherein the first portion and the second portion of each temple are cojoined to each other.

5. The apparatus as claimed in claim 1, wherein a proximal end of the first portion is coupled to the main frame via the means for coupling and the second portion extends from a distal end of the first portion.
6. The apparatus as claimed in claim 1, wherein an extent of flexion of the second portion of the temple is greater than an extent of flexion of the means for coupling.

7. The apparatus as claimed in claim 1, wherein the second portion of each temple flexes to grip the head of the user.

8. The apparatus as claimed in claim 1, wherein the means for coupling is at least one of, a spring-loaded hinge unit.

9. The apparatus as claimed in claim 1, wherein the second portion of each temple is made of at least one of, Thermoplastic Polyurethane (TPU), Thermoplastic elastomers (TPE) and a combination thereof.

10. The apparatus as claimed in claim 1, wherein the means for coupling is adapted to enable each temple to be displaced vertically in either direction relative to a plane of the main frame.

11. The apparatus as claimed in claim 1, wherein each temple is adapted to house components including at least, speakers, video System on Chip (SOC) and wiring.

12. The apparatus as claimed in claim 1, wherein an outer surface of each temple is coated with moisture resistant material.

13. The apparatus as claimed in claim 1, wherein thickness of each temple varies from the first portion to the second portion.

14. The apparatus as claimed in claim 1, wherein a sling is coupled to a distal end of the second portion of each temple.