The present disclosure relates to a light system for vehicles. Particularly, but not
exclusively, the present disclosure relates to an illumination lamp having uniform
illuminance/illumination.
TECHNICAL BACKGROUND
10
The information in this section merely provides background information related to
the present disclosure and may not constitute prior art(s).
In the recent years, vehicle manufacturers have been providing vehicles with an
15 illumination lamps. Such illumination lamps are mounted on the vehicle and are
used to indicate the presence of the vehicle to pedestrians and other vehicles.
Generally, such lamps are providing with a lens surface and a light source. The lens
surface having a plurality of facets and step downs structure, as shown in FIG. 1.
20 Such lens surface is configured to disperse light in various direction by receiving
light through a light source, as shown in FIG. 2. However, one major shortcoming
associated with such lamps that the lamp provides inferior illumination due to
dispersion of light in various direction. Thereby requiring a high-powered light
emitting source.
25
Therefore, there is immense need in the art to provide an illumination lamp that
overcome one or more limitations of existing lamps. Specifically, the present
disclosure relates to an illumination lamp that provides uniform illumination with
low power consumption.
30
SUMMARY
3
The present invention relates to an illumination lamp for an automobile. The said
lamp comprises a housing comprising a front end and a rear end defining an optical
region, a plurality of LEDs disposed at the rear end of housing and configured for
emitting light beam; and one or more lens comprising one or more illumination
5 surfaces, disposed in the optical region, wherein the lens surface is smooth and has
at least a curved side located adjacent to the plurality of LEDs.
In an embodiment of the present disclosure, at least one of the one or more lens is
a primary lens disposed in the optical region of the housing.
10 In an embodiment of the present disclosure, the illumination surface of the primary
lens has at least a flat side located oppositely to the curved side.
In an embodiment of the present disclosure, the radius of curvature of the curved
side of the primary lens is proportional to a spread angle of illumination of the lamp.
15 The radius of curvature of the curved side of the primary lens is within the range of
1.8 mm to 4 mm and the spread angle of illumination of the lamp with respect to a
vehicle optical axis is in the range of 10° to 30°.
In an embodiment of the present disclosure, at least one of the one or more lens is
20 a secondary lens disposed at the front end of the housing and configured to
illuminate upon receiving light beam.
In an embodiment of the present disclosure, the said lamp comprises a Printed
circuit Board (PCB) configured with the plurality of LEDs and a power source of
25 the vehicle.
The foregoing summary is illustrative only and is not intended to be in any way
limiting. In addition to the illustrative aspects, embodiments, and features described
above, further aspects, embodiments, and features will become apparent with
30 reference to the drawings and the following detailed description.
4
BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
Further aspects and advantages of the present invention will be readily understood
from the following detailed description with reference to the accompanying
figure(s). The figure(s) together with a detailed description below, are incorporated
5 in and form part of the specification, and serve to further illustrate the embodiments
and explain various principles and advantages, in accordance with the present
invention wherein:
FIG. 1: illustrates a cross-sectional view of an existing lens surface having a
plurality of facets and step downs structure.
10 FIG. 2: illustrates a dispersion of light through an existing lens surface of FIG.1.
FIG. 3: illustrates a perspective view of an illumination lamp in accordance with
the present disclosure.
FIG. 4: illustrates a perspective view of a primary lens in accordance with an
embodiment of the present disclosure.
15 FIG. 5: illustrates an illumination lamp while illuminating, according to an
embodiment of the present disclosure.
FIG. 6: illustrates a cross sectional view of a primary lens and a light emitting source
while illuminating, according to an embodiment of the present disclosure.
Skilled artisans will appreciate that elements in the drawings are illustrated for
20 simplicity and have not necessarily been drawn to scale. For example, the
dimensions of some of the elements in the drawings may be exaggerated relative to
other elements to help to improve understanding of embodiments of the present
invention.
DETAILED DESCRIPTION OF THE DISCLOSURE
5
While the invention is susceptible to various modifications and alternative forms,
specific embodiment thereof has been shown by way of example in the figures and
will be described in detail below. It should be understood, however that it is not
intended to limit the invention to the particular forms disclosed, but on the contrary,
5 the invention is to cover all modifications, equivalents, and alternative falling
within the spirit and the scope of the invention.
Before describing in detail embodiments, it may be observed that the novelty and
inventive step that are in accordance with the present disclosure resides in an
10 illumination lamp for an automobile. It is to be noted that a person skilled in the art
can be motivated from the present disclosure and modify the various constructions
of assembly, which are varying from vehicle to vehicle. However, such
modification should be construed within the scope and spirit of the invention.
Accordingly, the drawing(s) are showing only those specific details that are
15 pertinent to understanding the embodiments of the present invention so as not to
obscure the disclosure with details that will be readily apparent to those of ordinary
skill in the art having benefit of the description herein.
The terms “comprises”, “comprising”, or any other variations thereof, are intended
20 to cover a non-exclusive inclusion, such that a setup, device that comprises a list of
components does not include only those components but may include other
components not expressly listed or inherent to such setup or device. In other words,
one or more elements in a system or device proceeded by “comprises… a” does not,
without more constraints, preclude the existence of other elements or additional
25 elements in the system or device.
Accordingly, it is an aim of the present disclosure to provide an illumination lamp
having uniform illuminance/illumination.
30 Accordingly, the present disclosure discloses an illumination lamp for an
automobile described with reference to the figures and specific embodiments; this
6
description is not meant to be constructed in a limiting sense. Various alternative
embodiments from part of the present invention.
The illumination lamp is configured to mount on the front/rear of the vehicle. The
5 different vehicles may have different mounting configurations to accommodate the
illumination lamp. The illumination lamp may be varying in size to mount on the
vehicle of different sizes.
Figure 3 shows an illumination lamp (100) in accordance with an embodiment of
10 the disclosure. The illumination lamp (100) comprises a housing (1), one or more
lenses (3, 4), a light source (2), a control circuit and a fastening means. The housing
(1) encloses all above-mentioned components. The thickness of lens is within the
range of 18 mm to 20 mm.
As shown in FIG. 3-6, the housing comprises an optical region defined between a
15 rear end and a front end of the housing. The optical region illuminates through light
emitted by a light emitting source.
A plurality of LEDs is configured as a light source (2) for emitting light beam. The
plurality of LEDs (2) is configured with a power source for emitting light. The
20 plurality of LEDs is disposed at the rear end of the housing. In an embodiment of
the present disclosure, the plurality of LEDs (2) is adapted to the control circuit to
form a LED unit. The PCB is disposed at the rear end of the housing along with the
plurality of LEDs. The LED unit is configured to receive an input in form of
electrical energy from the power source and converted into light energy to produce
25 a beam of light.
As shown in Figs 3 -6, one or more lens (3, 4) comprises one or more illumination
surfaces. The lens is disposed in the optical region of the housing (1). The surface
of lens is smooth and has at least a curved side located adjacent to the plurality of
LEDs (2).
30
7
In an embodiment of the present disclosure, at least one of the one or more lens is
a primary lens (3). The primary lens is disposed in the optical region of the housing.
The primary lens has one or more primary lens illumination surfaces.
5 In an embodiment of the present disclosure, the surface of primary lens is smooth.
As shown in Figure 4, the surface of primary lens is flat from one side and curved
from other side. The curved side is located adjacent to the plurality of LEDs (2). In
another embodiment of the present disclosure, the primary lens is placed at the
middle of the housing within the optical region. In an embodiment of the present
10 disclosure, distance between the primary lens (3) and the plurality of LEDs (2) is
within the range of 7 mm to 13 mm.
In an embodiment of the present disclosure, as shown in figure 3, the illumination
lamp is provided with three LED bulbs and three primary lens surfaces. Each LED
15 bulb is located to the opposite to the curved side of each primary lens surface such
that curved end can receive maximum light.
In an embodiment of the present disclosure, the radius of curvature of the curved
side of the primary lens (3) is proportional to a spread angle of illumination of the
20 lamp. In an embodiment of the present disclosure, the radius of curvature of the
curved side of the primary lens (3) is within the range of 1.8 mm to 4 mm and the
spread angle of illumination of the lamp with respect to a vehicle optical axis is in
the range of 10° to 30°.
25 In an embodiment of the present disclosure, at least one of the one or more lens is
a secondary lens (4) disposed at the front end of the housing (1) and configured to
illuminate upon receiving light beam.
In an embodiment of the present disclosure, as shown in figure 3 and 4, the housing
30 (1) comprises two lenses namely the primary lens (3) and a secondary lens (4). The
primary lens (3) is provided to direct light towards the front end of the housing (1)
8
by receiving light from the light emitting source. The primary lens functions as a
virtual focus lens by optimizing the virtual focal point for the light beam emitted
from the plurality of LEDs.
5 The secondary lens (4) is configured to illuminate upon receiving light beam from
the primary lens (3). The secondary lens functions as a scattering lens by emitting
the light beam for illumination.
In an embodiment of the present disclosure, the primary lens (3) and the secondary
10 lens (4) are joined together to form a single lens whereby the illumination surface
of the lens is flat at first side and curved at second side whereby the curved side of
lens is located adjacent to the plurality of LEDs (2).
As shown in FIG. 5, the primary lens is provided to direct light towards the front
15 end of the housing by receiving light from the light emitting source. The secondary
lens is disposed at the front end of the housing. The secondary lens is configured to
illuminate upon receiving light from the primary lens. In an embodiment of the
present disclosure, distance between the primary lens (3) and the secondary lens (4)
is in the range of 0 mm to 13 mm.
20
In an embodiment of the present disclosure, the fastening means can be a plurality
of screws or plurality of locators, sealing means or a group of fasteners and the like.
The optical system of lamp is provided in to achieve the maximum solid angle
resulting into higher luminous flux collection on lens while eliminating
25 requirements of step-down structures at surface of lens.
Referring to Figure 5 and 6, during operation, when the plurality of LEDs (120) are
energized by a power source, it emits light onto the primary lens (3). The light
beam from the plurality of LEDs (120) is incident on the curved side of the surface
30 of the primary lens (3). As the curvature of the curved side of the primary lens (3)
9
is proportional to a spread angle of illumination of the lamp, the surface of lens
emits the light beam at predetermined angle towards the secondary lens (4). The
secondary lens illuminates upon receiving light from the primary lens.
5 Accordingly, the illumination lamp of the present disclosure produces a uniform
illuminance/illumination while keeping thickness of lens less in comparison to
existing arts. Due to above-mentioned configuration the illumination lamp does not
require thermal management system as low power LEDs can be employed to
achieve the required illumination. Further, as the surface of lens is smooth, flux
10 losses arise due to step down structure of surface of existing arts, are eliminated.
List of Reference Numerals
15
Equivalents:
The embodiments herein and the various features and advantageous details thereof
20 are explained with reference to the non-limiting embodiments in the description.
Descriptions of well-known components and processing techniques are omitted so
as to not unnecessarily obscure the embodiments herein. The examples used herein
are intended merely to facilitate an understanding of ways in which the
embodiments herein may be practiced and to further enable those of skill in the art
25 to practice the embodiments herein. Accordingly, the examples should not be
construed as limiting the scope of the embodiments herein.
Sr. No. Description
1 Housing
2 Light emitting source
3 Primary lens
4 Secondary lens
10
The foregoing description of the specific embodiments will so fully reveal the
general nature of the embodiments herein that others can, by applying current
knowledge, readily modify and/or adapt for various applications such specific
embodiments without departing from the generic concept, and, therefore, such
5 adaptations and modifications should and are intended to be comprehended within
the meaning and range of equivalents of the disclosed embodiments. It is to be
understood that the phraseology or terminology employed herein is for the purpose
of description and not of limitation. Therefore, while the embodiments herein have
been described in terms of preferred embodiments, those skilled in the art will
10 recognize that the embodiments herein can be practiced with modification within
the spirit and scope of the embodiments as described herein.
Throughout this specification the word “comprise”, or variations such as
“comprises” or “comprising”, will be understood to imply the inclusion of a stated
15 element, integer or step, or group of elements, integers or steps, but not the
exclusion of any other element, integer or step, or group of elements, integers or
steps.
The use of the expression “at least” or “at least one” suggests the use of one or more
20 elements or ingredients or quantities, as the use may be in the embodiment of the
disclosure to achieve one or more of the desired objects or results.
Any discussion of documents, acts, materials, devices, articles and the like that has
been included in this specification is solely for the purpose of providing a context
25 for the disclosure. It is not to be taken as an admission that any or all of these matters
form a part of the prior art base or were common general knowledge in the field
relevant to the disclosure as it existed anywhere before the priority date of this
application.
30 The numerical values mentioned for the various physical parameters, dimensions
or quantities are only approximations and it is envisaged that the values
11
higher/lower than the numerical values assigned to the parameters, dimensions or
quantities fall within the scope of the disclosure, unless there is a statement in the
specification specific to the contrary.
5 While considerable emphasis has been placed herein on the particular features of
this disclosure, it will be appreciated that various modifications can be made, and
that many changes can be made in the preferred embodiments without departing
from t he principles of the disclosure. These and other modifications in the nature
of the disclosure or the preferred embodiments will be apparent to those skilled in
10 the art from the disclosure herein, whereby it is to be distinctly understood that the
foregoing descriptive matter is to be interpreted merely as illustrative of the
disclosure and not as a limitation.

We Claim:

1. An illumination lamp (100) for an automobile, comprising:
a housing (1) comprising a front end and a rear end defining an optical
region;
5 a plurality of LEDs (2) disposed at the rear end of housing (1) and
configured for emitting light beam; and
one or more lens (3, 4) comprising one or more illumination surfaces,
disposed in the optical region, wherein the lens surface is smooth and has at
least a curved side located adjacent to the plurality of LEDs (2).
10
2. The illumination lamp (100) as claimed in claim 1, wherein at least one of
the one or more lens is a primary lens (3) disposed in the optical region of
the housing (1).
15 3. The illumination lamp (100) as claimed in claim 2, wherein the illumination
surface of the primary lens (3) has at least a flat side located oppositely to
the curved side.
4. The illumination lamp (100) as claimed in claim 3, wherein the radius of
20 curvature of the curved side of the primary lens (3) is proportional to a
spread angle of illumination of the lamp.
5. The illumination lamp (100) as claimed in claim 3, wherein the radius of
curvature of the curved side of the primary lens (3) is within the range of
25 1.8 mm to 4 mm.
6. The illumination lamp (100) as claimed in claims 1 and 3, wherein the
spread angle of illumination of the lamp with respect to a vehicle optical
axis is in the range of 10° to 30°.
30
13
7. The illumination lamp (100) as claimed in claims 1 and 2, wherein at least
one of the one or more lens is a secondary lens (4) disposed at the front end
of the housing (1) and configured to illuminate upon receiving light beam.
5 8. The illumination lamp (100) as claimed in claims 1, 2 and 7, wherein the
distance between the primary lens (3) and the secondary lens (4) is in the
range of 0 mm to 13 mm.
9. The illumination lamp (100) as claimed in claim 1, wherein the distance
10 between the primary lens (3) and the plurality of LEDs (2) is within the
range of 7 mm to 13 mm.
10. The illumination lamp (100) as claimed in claim 1, comprises a Printed
circuit Board (PCB) configured with the plurality of LEDs and a power
15 source of the vehicle.