CROSS-REFERENCE TO RELATED APPLICATION
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0002] The present invention relates to a headlamp of a vehicle, and more particularly,
to an automotive headlamp which is structured in a simple manner to secure a sufficient
amount of light, emit light in different/various beam patterns, and improve heat dissipation
efficiency.
2. Description of the Related Art
[0003] Vehicles are typically equipped with various automotive lamps having a lighting function
and a signaling function, among others. That is, automotive lamps enable the driver
of the vehicle to easily detect objects around and ahead of the vehicle while driving
at night or in a dark area. They also inform other vehicles and road users of the
vehicle's driving state. For example, a headlamp and a fog lamp are designed for providing
light, and a direction indicator, a taillight, a brake light, and a side marker are
designed for signaling.
[0004] Recently, many automotive lamp manufactures have begun to use halogen lamps or high-intensity
discharge (HID) lamps as light sources. Additionally, light-emitting diodes (LEDs)
have been used as light sources as well. LEDs have a color temperature of approximately
5500 K which is close to that of sunlight. Thus, LEDs cause the least eye fatigue.
In addition, LEDs increase the freedom of lamp design due to their small size and
are economical due to their semi-permanent lifespan.
[0005] LEDs, in particular, are being introduced to reduce lamp configuration complications
and decrease the number of manufacturing processes required to produce a headlamp.
In particular, attempts are being made to extend lamp life using characteristics of
LEDs. Furthermore, since limited space is not an issue due to the small size of the
LEDs, they may be utilized in a plethora of applications.
[0006] Of the various types of automotive lamps, a headlamps use more than one beam pattern
unlike other types of lamps which typically use only one. For example, the headlamp
may emit light in a beam pattern optimum for driving conditions of the vehicle such
as travelling speed, travelling direction, road surface conditions, and ambient brightness.
In so doing, the headlamp may ensure driver visibility without blinding other vehicle
drivers on the road. Generally, one or more LEDs are used to emit light in each beam
pattern while securing a sufficient amount of light. However, to emit light in different
beam patterns, elements corresponding to each beam pattern are required. Accordingly,
this increases the number of parts, costs and space required. In addition, when LEDs
are used as light sources of automotive lamps, the light emission efficiency of the
LEDs rapidly deteriorate as the temperature rises.
[0007] Therefore, a solution that can emit light in various beam patterns, secure a sufficient
amount of light, and prevent a temperature rise due to heat emitted from LEDs while
reducing the number of parts, costs and space required to emit light in different
beam patterns is required.
SUMMARY OF THE INVENTION
[0008] Aspects of the present invention provide an automotive headlamp in which a plurality
of lamp modules, which use light-emitting diodes (LEDs) for emitting light in different
beam patterns as light sources, are placed in different directions from an optical
axis of the automotive headlamp to minimize the space required and emit light in various
beam patterns and in which a lamp module for emitting light in a predetermined beam
pattern consists of a plurality of lamp modules to secure a sufficient amount of light.
[0009] Aspects of the present invention also provide an automotive headlamp in which heat
sinks are installed to efficiently prevent a temperature rise due to heat emitted
from LEDs.
[0010] However, aspects of the present invention are not restricted to the one set forth
herein. The above and other aspects of the present invention will become more apparent
to one of ordinary skill in the art to which the present invention pertains by referencing
the detailed description of the present invention given below.
[0011] According to an aspect of the present invention, there is provided an automotive
headlamp including: a plurality of lamp modules disposed in different directions from
an optical axis of the automotive headlamp; and a projection lens projecting light
emitted from one or more of the lamp modules, wherein each of the lamp modules includes:
a light source unit emitting light downward; and a reflector disposed under the light
source unit and reflecting light emitted from the light source unit.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The above and other aspects and features of the present invention will become more
apparent by describing in detail exemplary embodiments thereof with reference to the
attached drawings, in which:
FIG. 1 is a perspective view of an automotive headlamp according to a first exemplary
embodiment of the present invention;
FIG. 2 is a schematic front view of a first lamp module and a second lamp module according
to the first exemplary embodiment of the present invention;
FIG. 3 is a perspective view of an automotive headlamp according to a second exemplary
embodiment of the present invention;
FIG. 4 is a schematic front view of a first lamp module and a second lamp module according
to the second exemplary embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the direction in which light travels in
the automotive headlamp of FIGS. 1 and 2;
FIGS. 6 and 7 are schematic views of heat sinks according to the first exemplary embodiment
of the present invention;
FIG. 8 is a schematic view of heat pads according to an exemplary embodiment of the
present invention;
FIG. 9 is a schematic view of heat sinks according to the second exemplary embodiment
of the present invention;
FIGS. 10 and 11 are perspective views of an assembled automotive headlamp according
to an exemplary embodiment of the present invention;
FIG. 12 is a plan view of the assembled automotive headlamp shown in FIGS. 10 and
11; and
FIG. 13 is a base view of the assembled automotive headlamp shown in FIGS. 10 and
11.
DETAILED DESCRIPTION OF THE INVENTION
[0013] Advantages and features of the present invention and methods of accomplishing the
same may be understood more readily by reference to the following detailed description
of exemplary embodiments and the accompanying drawings. The present invention may,
however, be embodied in many different forms and should not be construed as being
limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments
are provided so that this disclosure will be thorough and complete and will fully
convey the concept of the invention to those skilled in the art, and the present invention
will only be defined by the appended claims. Like reference numerals refer to like
elements throughout the specification.
[0014] In some embodiments, well-known manufacturing processes, well-known structures and
well-known technologies will not be specifically described in order to avoid ambiguous
interpretation of the present invention.
[0015] The terminology used herein is for the purpose of describing particular embodiments
only and is not intended to be limiting of the invention. As used herein, the singular
forms "a", "an" and "the" are intended to include the plural forms as well, unless
the context clearly indicates otherwise. It will be further understood that the terms
"comprises" and/or "comprising," when used in this specification, specify the presence
of stated elements, steps, and/or operations, but do not preclude the presence or
addition of one or more other elements, steps, operations, and/or groups thereof.
As used herein, the term "and/or" includes any and all combinations of one or more
of the associated listed items.
[0016] Embodiments of the invention are described herein with reference to perspective,
cross-sectional, side, and/or schematic illustrations that are illustrations of idealized
embodiments of the invention. As such, variations from the shapes of the illustrations
as a result, for example, of manufacturing techniques and/or tolerances, are to be
expected. Thus, embodiments of the invention should not be construed as limited to
the particular shapes of regions illustrated herein but are to include deviations
in shapes that result, for example, from manufacturing. In the drawings, each element
may be exaggerated or reduced for clarity.
[0017] Automotive headlamps according to embodiments of the present invention will now be
described with reference to the attached drawings.
[0018] FIG. 1 is a perspective view of an automotive headlamp 1 according to a first exemplary
embodiment of the present invention. FIG. 2 is a schematic front view of a first lamp
module 100 and a second lamp module 200 according to the first exemplary embodiment
of the present invention.
[0019] Referring to FIGS. 1 and 2, the automotive headlamp 1 according to the first exemplary
embodiment may include the first lamp module 100, the second lamp module 200, a shield
300, and a projection lens 400. In the first embodiment of the present invention,
the first lamp module 100 and the second lamp module 200 are disposed in different
directions from an optical axis C of the projection lens 400 and used/configured to
emit light in different beam patterns. In the first embodiment of the present invention,
the first lamp module 100 may be disposed above the optical axis C and used to emit
light in a low-beam pattern, and the second lamp module 200 may be disposed below
the optical axis C and used to emit light in a high-beam pattern.
[0020] In addition, the first lamp module 100 and the second lamp module 200 are used in
the first embodiment of the present invention. However, the present invention is not
limited thereto, and a lamp module can be added or removed according to beam patterns
used.
[0021] The first lamp module 100 may include a first light source unit 110 which emits light
downward and a first reflector 120 which reflects light emitted from the first light
source unit 110 so that the light is directed toward a lower part of the projection
lens 400. The first light source unit 110 may include a light source 111 and a substrate
112 on which the light source 111 is installed. The light source 111 may be installed
on a bottom surface of the substrate 112 to emit light downward. The first reflector
120 may be disposed under the first light source unit 110 to reflect light emitted
from the first light source unit 110 and may be shaped in the form of an oval or free
curved surface having an open surface.
[0022] The second lamp module 200 may include a second light source 201 which emits light
downward and a second reflector 202 which reflects light emitted from the second light
source 201 such that the light travels toward an upper part of the projection lens
400. Like the first light source unit 110, the second light source unit 201 may include
a light source 201a and a substrate 201b on which the light source 201a is installed.
The light source 201a may be installed on a bottom surface of the substrate 201b to
emit light downward. Also like the first reflector 120, the second reflector 202 may
be disposed under the second light source unit 201 to reflect light emitted from the
second light source unit 201 and may be shaped like an oval or free curved surface
having an open surface.
[0023] In the first embodiment of the present invention, the light source 111 of the first
light source unit 110 and the light source 201a of the second light source unit 201
may be, but are not limited to, light-emitting diodes (LEDs). In addition, the first
reflector 120 and the second reflector 202 may be physically connected to each other
or separated from each other. When the first reflector 120 and the second reflector
202 are disposed under the first light source unit 110 and the second light source
unit 201, respectively, the entire first reflector 120 and the entire second reflector
202 may be disposed under the first light source unit 110 and the second light source
unit 201, respectively, or part of the first reflector 120 and part of the second
reflector 202 may be disposed under the first light source unit 110 and the second
light source unit 201, respectively.
[0024] In the first embodiment of the present invention, light emitted from the first lamp
module 100 may travel toward the lower part of the projection lens 400, and light
emitted from the second lamp module 200 may travel toward the upper part of the projection
lens 400. To this end, the first reflector 120 may reflect the light emitted from
the first lamp module 100 toward the lower part of the projection lens 400, and the
second reflector 202 may reflect the light emitted from the second lamp module 200
toward the upper part of the projection lens 400. In addition, each of the first lamp
module 100 and the second lamp module 200 may be placed at a predetermined angle to
the optical axis C.
[0025] The shield 300 may be disposed in front of the first lamp module 100 and the second
lamp module 200. The shield 300 may form a predetermined cut-off line by blocking
part of light emitted from one or more of the first lamp module 100 and the second
lamp module 200. The shield 300 may be shaped like a plate having a semicircular groove
310 at a side thereof. The shape of the groove 310 can vary, however, and is not limited
to the illustrative embodiment of the present invention.
[0026] In the first exemplary embodiment of the present invention, the shield 300 may block
or reflect part of light emitted from the first lamp module 100 in order to project
the light in the low-beam pattern. To reflect part of light, a surface of the shield
300 may be coated with a reflective layer.
[0027] In FIGS. 1 and 2 described above, one lamp module is disposed above and below the
optical axis C. However, this is merely an example used to help understand the present
invention, and the present invention is not limited to this example. One or more of
the first lamp module 100 and the second lamp module 200 may also consist of a plurality
of lamp modules arranged in a particular direction.
[0028] FIG. 3 is a perspective view of an automotive headlamp 1 according to a second exemplary
embodiment of the present invention. FIG. 4 is a schematic front view of a first lamp
module 100 and a second lamp module 200 according to the second embodiment of the
present invention. In FIGS. 3 and 4, the second lamp module 200 consists of a plurality
of lamp modules. Referring to FIGS. 3 and 4, unlike the above-described automotive
headlamp 1 of FIGS. 1 and 2, the automotive headlamp 1 according to the second embodiment
of the present invention may include the second lamp module 200 which consists of
a lamp module 210 and a lamp module 220 respectively disposed on both sides of an
optical axis C. In the second embodiment of the present invention, the second lamp
module 200 consists of two lamp modules. However, the number of lamp modules that
constitute the second lamp module 200 can vary, and thus should not be limited hereto.
[0029] The first lamp module 100, a shield 300, and a projection lens 400 of FIGS. 3 and
4 are identical to those described above with reference to FIGS. 1 and 2, and thus
a detailed description thereof will be omitted.
[0030] In the second embodiment of the present invention, the lamp module 210 and the lamp
module 220 are respectively disposed on both sides of the optical axis C in an orientation
which is horizontal to each other. However, the present invention is not limited thereto.
[0031] The lamp module 210 may include a light source unit 211 and a reflector 212, and
the lamp module 220 may include a light source unit 221 and a reflector 222. The light
source unit 211 and the light source unit 221 may include light sources 211a and 221a
and substrates 211b and 221b on which the light sources 211a and 221a are installed,
respectively. The light sources 211a and 221a may be disposed on bottom surfaces of
the substrates 211b and 221b to emit light downward.
[0032] As in FIGS. 1 and 2, in FIGS. 3 and 4, the light source 211a of the light source
unit 211 and the light source 221a of the light source unit 221 may be LEDs. The reflector
212 may be disposed under the light source unit 211 to reflect light emitted from
the light source unit 211, and the reflector 222 may be disposed under the light source
unit 221 to reflect light emitted from the light source unit 221. If the reflector
212 and the reflector 222 are disposed under the light source unit 211 and the light
source unit 221, respectively, the whole of the reflector 212 and the whole of the
reflector 222 may be disposed under the light source unit 211 and the light source
unit 221, respectively, or part of the reflector 212 and part of the reflector 222
may be disposed under the light source unit 211 and the light source unit 221, respectively.
[0033] The reflector 212 and the reflector 222 may be physically connected to each other
or independently attached. The light source unit 211 and the light source unit 221
may be situated at first focal points of the reflector 212 and the reflector 222,
respectively. The reflector 212 and the reflector 222 may have identical or different
second focal points behind the projection lens 400. If the second lamp module 200
consists of a plurality of lamp modules arranged in a particular direction as described
above, a sufficient amount of light can be secured with relatively low power consumption.
[0034] FIG. 5 is a schematic diagram illustrating the direction in which light travels in
the automotive headlamp 1 of FIGS. 1 and 2. The principle illustrated in FIG. 5 can
also apply to the automotive headlamp 1 of FIGS. 3 and 4. Referring to FIG. 5, the
first lamp module 100 may be disposed above the optical axis C, and the second lamp
module 200 may be disposed below the optical axis C. The shield 300 may be disposed
in front of the first lamp module 100 and the second lamp module 200.
[0035] The first light source unit 110 of the first lamp module 100 and the second light
source unit 201 of the second lamp module 200 emit light downward. The light emitted
from the first light source unit 110 and the light emitted from the second light source
unit 201 may be reflected respectively by the first reflector 120 and the second reflector
202 to reach the projection lens 400 via the shield 300, as indicated by arrows in
FIG. 5.
[0036] In FIG. 5, light is passing through the groove 310 of the shield 300 to reach the
projection lens 400 is illustrated as an example. However, the present invention is
not limited to this case. Part of the light can also be blocked or reflected by a
surface of the shield 300 which does not have the groove 310.
[0037] In the above-described embodiments of the present invention, LEDs are used as light
sources. However, since LEDs are vulnerable to heat, their performance may deteriorate
when the LEDs are exposed to heat. Therefore, heat sinks may be used to prevent a
temperature increase due to heat emitted from the LEDs.
[0038] FIGS. 6 and 7 are schematic views of heat sinks 500 installed on lamp modules according
to the first exemplary embodiment of the present invention. In FIGS. 6 and 7, an example
heat sink 500 installed on each lamp module of the automotive headlamp 1 of FIGS.
1 and 2 is illustrated. Referring to FIGS. 6 and 7, the first lamp module 100 and
the second lamp module 200 may be disposed above and below the optical axis C of the
projection lens 400. In this case, the heat sinks 500 may be installed on the first
lamp module 100 and the second lamp module 200, respectively.
[0039] Specifically, in the first embodiment of the present invention, the first reflector
120 is disposed under the first light source unit 110 in the first lamp module 100,
and the second reflector 202 is disposed under the second light source unit 201 in
the second lamp module 200. Therefore, the heat sinks 500 may be installed on the
first light source unit 110 and the second light source unit 201, respectively. That
is, the heat sinks 500 may be installed on a top surface of the substrate 112 of the
first light source unit 110 and a top surface of the substrate 201b of the second
light source unit 201, respectively.
[0040] Each substrate 112 of the first light source unit 110 and substrate 201b of the second
light source unit 201 may extend in one direction along the length of a corresponding
heat sink 500. For this reason, a relatively large-sized heat sink 500 can be installed.
In addition, the shape of the substrate 112 of the first light source unit 110 and
the shape of the substrate 201b of the second light source unit 201 can vary according
to the shape of a corresponding heat sink 500.
[0041] In FIGS. 6 and 7, the heat sinks 500 are installed on the first light source unit
110 and the second light source unit 201 in order to efficiently dissipate heat. That
is, since heat is concentrated in upper parts of the first lamp module 100 and the
second lamp module 200 due to natural convection, the heat sinks 500 may be installed
on the first light source unit 110 and the second light source unit 201, respectively.
Heat pads 510 may also be formed between the substrates 112 and 201b and the heat
sinks 500 as shown in FIG. 8 to make contact surfaces between the substrates 112 and
201b and the heat sinks 500 level and increase heat transfer efficiency accordingly.
[0042] In the first exemplary embodiment of the present invention, each of the heat sinks
500 includes a plurality of heat dissipating pins which extend upward from above a
corresponding light source unit 110 or 201. However, this is merely an example used
to help understand the present invention, and the present invention is not limited
to this example. Each of the heat sinks 500 may also be a heat pipe or a heat spreader.
For example, a side of the heat spreader may be bent in order to increase heat transfer
area.
[0043] FIG. 9 is a schematic view of heat sinks 500 installed on lamp modules according
to the second embodiment of the present invention. In FIG. 9, an example heat sink
500 installed on each lamp module of the automotive headlamp 1 of FIGS. 3 and 4 is
illustrated. Referring to FIG. 9, the first lamp module 100 may be installed above
the optical axis C of the projection lens 400, and the lamp module 210 and the lamp
module 220 that constitute the second lamp module 200 may be disposed below the optical
axis C to be horizontal to each other. In this case, the heat sinks 500 may be disposed
on the lamp modules 100, 210, and 220, respectively.
[0044] Specifically, in the second embodiment of the present invention, the first reflector
120 is disposed under the first light source unit 110 in the first lamp module 100,
and the reflector 212 and the reflector 222 are disposed under the light source unit
211 and the light source unit 221 in the lamp module 210 and the lamp module 220,
respectively. Therefore, the heat sinks 500 may be disposed on the first light source
unit 110, the light source unit 211 and the light source unit 221, respectively. That
is, the heat sinks 500 may be installed on a top surface of the substrate 112 of the
first light source unit 110 and top surfaces of the substrates 211b and 221b of the
light source unit 211 and the light source unit 221, respectively.
[0045] In the second exemplary embodiment of the present invention, a single heat sink 500
may extend over the top surfaces of the light source unit 211 and the light source
unit 221. However, the present invention is not limited thereto. Separate heat sinks
500 can also be installed on the top surfaces of the substrates 211b and 221b of the
light source unit 211 and the light source unit 221, respectively.
[0046] The substrate 112 of the first light source unit 110 and the substrates 211b and
221b of the light source unit 211 and the light source unit 221 may extend in one
direction along the length of a corresponding heat sink 500. For this reason, a relatively
large-sized heat sink 500 can be installed. In addition, the shape of the substrate
112 of the first light source unit 110 and the shapes of the substrates 211b and 221b
of the light source unit 211 and the light source unit 221 can vary according to the
shape of a corresponding heat sink 500.
[0047] In FIG. 9, the heat sink 500 is installed on each light source unit 110, 211 or 221
to provide efficient heat dissipation. That is, since heat is concentrated in an upper
part of each lamp module 100, 210 or 220 due to natural convection, the heat sink
500 may be installed on each light source unit 110, 211 or 221 accordingly to dissipate
this heat. Although not shown in FIG. 9, heat pads may also be formed between the
substrates 112, 211b and 221b and the heat sinks 500 as shown in FIG. 8 to make contact
surfaces between the substrates 112, 211b and 221b and the heat sinks 500 level and
increase heat transfer efficiency.
[0048] FIGS. 10 and 11 are perspective views of an assembled automotive headlamp 1 according
to an embodiment of the present invention. FIG. 12 is a plan view of the assembled
automotive headlamp 1 shown in FIGS. 10 and 11. FIG. 13 is a base view of the assembled
automotive headlamp 1 shown in FIGS. 10 and 11. In FIGS. 10 through 13, the assembled
structure of the automotive headlamp 1 of FIGS. 3, 4 and 9 is illustrated as an example.
The same structure may also apply to the automotive headlamp 1 of FIGS. 1 and 2. For
simplicity, reference numerals for some elements are omitted. However, elements substantially
identical to those of FIGS. 3, 4 and 9 are indicated by like reference numerals.
[0049] Referring to FIGS. 10 through 13, in the automotive headlamp 1 according to the current
embodiment, a first lamp module 100 may be installed above an optical axis C of a
projection lens 400, and a second lamp module 200 may be installed below the optical
axis C. In addition, a lamp module 210 and a lamp module 220 of a second lamp module
200 may be disposed in a horizontal orientation to each other.
[0050] In the first lamp module 100, a first light source unit 110 may be formed on a bottom
surface of a heat sink 500, and a first reflector 120 may be coupled to the heat sink
500 by first coupling members 710 (e.g., first set of screws). In addition, in the
lamp module 210 and the lamp module 220, a light source unit 211 and a light source
unit 221 may be formed on a bottom surface of a heat sink 500, and a reflector 212
and a reflector 222 may be coupled to the heat sink 500 by second coupling members
720 (e.g., a second set of screws).
[0051] In addition, at least one of the heat sinks 500 installed on the first lamp module
100, the lamp module 210 and the lamp module 220 may be integrally connected to a
lens holder 410 which supports the projection lens 400 by connecting portions 600.
In the current embodiment of the present invention, the heat sink 500 installed on
the lamp module 210 and the lamp module 220 may be connected to the lens holder 410
by the connecting portions 600. In the current embodiment of the present invention,
the lens holder 410 is connected to at least one of the heat sinks 500 installed on
the first lamp module 100, the lamp module 210 and the lamp module 220. However, the
present invention is not limited thereto. The lens holder 410 can also be connected
to any one of the elements included in each lamp module 100, 210 or 220.
[0052] A shield 300 may include an extension portion 320 formed by extending a front end
of the shield 300 located near a focus behind the projection lens 400 backward. In
the exemplary embodiment of the present invention, the extension portion 320 may be
mounted on the connecting portions 600. In addition, the front end of the shield 300
may be curved so that it is gradually displaced toward both sides of the projection
lens 400 along a focal plane behind the projection lens 400.
[0053] Coupling portions 130 may be formed on one side of the heat sink 500 installed on
the first lamp module 100 and may be coupled to a surface of the extension portion
320 which extends backward from the shield 300. Coupling members 131 (e.g., a third
set of screws) may be inserted into the coupling portions 130, thereby coupling the
coupling portions 130, the extension portion 320 and the connecting portions 600 to
each other. In the embodiment of the present invention, the extension portion 320
and the coupling portions 130 are flat plate-shaped portions, and a surface of the
extension portion 320 is coupled to respective surfaces of the coupling portions 130
by the coupling members 131. However, the present invention is not limited thereto,
and the extension portion 320 and the coupling portions 130 can also be coupled to
each other using various coupling methods such as hook coupling and sliding coupling.
[0054] In the current embodiment of the present invention, the heat sink 500 installed on
the first lamp module 100 is coupled to a surface of the extension portion 320. However,
this is merely an example used to help understand the present invention, and the present
invention is not limited to this example. At least one of the heat sinks 500 formed
on the first lamp module 100 and the lamp module 210 and the lamp module 220 may be
coupled to a surface of the extension portion 320 of the shield 300 according to the
position or direction of the extension portion 320 which extends from the shield 300.
[0055] Advantageously, the above described lamp modules which use LEDs as light sources
are placed in different directions from an optical axis of the headlamp, and the other
elements are placed so that they can be shared by the lamp modules. Therefore, the
space required can be minimized while light can be emitted in various beam patterns.
In addition, since a plurality of lamp modules are installed in a predetermined direction
from the optical axis of the headlamp, a sufficient amount of light can be secured.
Furthermore, heat sinks may be installed on light source units to efficiently prevent
a temperature increases due to heat emitted from the LEDs.
[0056] However, the effects of the present invention are not restricted to the one set forth
herein. The above and other effects of the present invention will become more apparent
to one of daily skill in the art to which the present invention pertains by referencing
the claims.
[0057] While the present invention has been particularly shown and described with reference
to exemplary embodiments thereof, it will be understood by those of ordinary skill
in the art that various changes in form and detail may be made therein without departing
from the spirit and scope of the present invention as defined by the following claims.
The exemplary embodiments should be considered in a descriptive sense only and not
for purposes of limitation. The scope of the present invention is defined by the following
claims, rather than by the above-described detailed description. The meanings and
scope of the claims, and all modifications or modified shapes, which are derived from
equivalent concepts thereof, should be understood as being included in the scope of
the present invention.
1. An automotive headlamp comprising:
a plurality of lamp modules disposed in different directions from an optical axis
of the automotive headlamp; and
a projection lens projecting light emitted from one or more of the lamp modules,
wherein each of the lamp modules includes:
a light source unit emitting light downward; and
a reflector disposed under the light source unit and configured to reflect light emitted
from the light source unit.
2. The headlamp of claim 1, wherein lamp modules comprise a first lamp module disposed
above the optical axis and a second lamp module disposed below the optical axis.
3. The headlamp of claim 2, wherein the first lamp module is used to emit light in a
low-beam pattern, and the second lamp module is used to emit light in a high-beam
pattern.
4. The headlamp of claim 1, wherein one or more of the lamp modules include a plurality
of lamp modules arranged in a particular direction.
5. The headlamp of claim 1, wherein the light source unit comprises a light source and
a substrate having the light source installed on a bottom surface thereof.
6. The headlamp of claim 5, wherein the light source is a light-emitting diode (LED).
7. The headlamp of claim 1, further comprising heat sinks installed on top surfaces of
the light source units of the lamp modules, respectively.
8. The headlamp of claim 7, wherein at least one of the heat sinks installed on the top
surfaces of the light source units is coupled to a surface of an extension portion
which extends backward from a shield placed in front of the lamp modules.
9. The headlamp of claim 8, wherein the extension portion is coupled to coupling portions
which extend from at least one of the heat sinks installed on the top surfaces of
the light source units.
10. The headlamp of claim 8, wherein the extension portion is mounted on respective surfaces
of connecting portions which connect at least one of the lamp modules to a lens holder
which supports the projection lens.
11. The headlamp of claim 10, wherein the connecting portions are connected between at
least one of the heat sinks installed on the light source units and the lens holder.
12. The headlamp of claim 7, wherein heat pads are formed in contact surfaces between
the light source units and the heat sinks, respectively.
13. The headlamp of claim 7, wherein each of the heat sinks is a heat spreader or a heat
pipe.
14. The headlamp of claim 1, further comprising the shield disposed in front of the lamp
modules, wherein the shield forms a low-beam pattern by blocking part of light emitted
from one or more of the lamp modules.
15. The headlamp of claim 1, wherein the light source unit is placed at a predetermined
angle to the optical axis according to a beam pattern, and the reflector is placed
according to the angle of the light source unit.
16. The headlamp of claim 7, wherein each of the heat sinks comprises a plurality of dissipating
pins which extend upward above a corresponding light source unit.