JP6120165B2 - Light source unit and vehicle headlamp using the same - Google Patents

Description

  The present invention relates to a light source unit and a vehicle headlamp using the same.

  Vehicles such as two-wheeled vehicles (motorbikes) or four-wheeled vehicles are provided with vehicle headlamps such as headlights for irradiating the front of a road surface or the like. Conventionally, halogen light bulb lamps, HID lamps, and the like have been used as light sources for vehicle headlamps.

  In recent years, products using semiconductor light emitting devices such as light emitting diodes (LEDs) as a light source have been actively developed, and vehicle headlamps also have a light emitting efficiency and a longer life than HID lamps. As a feasible method, an LED light source has been studied.

  For example, a vehicle headlamp using LEDs has been proposed that includes an LED module, a drive circuit that performs drive control of the LED module, and a heat dissipation member that dissipates heat generated by the LED module. In addition, a vehicle headlamp having both functions of a Low beam (passing beam) and a Hi beam (traveling beam) using two LED modules has been proposed.

  In the LED, heat is generated from the LED itself by light emission, and the temperature of the LED increases due to this heat, and the light output decreases. Further, the LED is destroyed at a relatively low temperature of 150 ° C. to 175 ° C. In addition, since the vehicular headlamp is used for automobiles, the ambient temperature for use is as high as 125 ° C., and the allowable temperature rise is only 25 ° C. to 50 ° C. For this reason, when using LED as a light source of a vehicle headlamp, it is necessary to effectively dissipate heat generated by the LED. In particular, when two LED modules are used, it is necessary to dissipate heat more effectively.

  Accordingly, conventional vehicle headlamps are often equipped with large heat sinks (heat dissipating members), and the vehicle headlamps (headlamps ASSY) are increased in size, resulting in an increase in weight and cost. It has become.

  Therefore, a vehicle headlamp intended to suitably dissipate the LED and the drive circuit has been proposed, and Patent Document 1 discloses a heat dissipating member (heat sink) having an extending portion extending forward, An LED module for Low beam disposed on the upper surface of the extending portion, an LED module for Hi beam disposed on the lower surface of the extending portion, and a reflector for reflecting the light of these two LED modules forward There is disclosed a vehicular headlamp comprising:

JP 2013-030371 A

  However, the vehicle headlamp disclosed in Patent Document 1 has a problem that the two LED modules are affected by heat generated by each of the two LED modules. In particular, when two LED modules emit light at the same time, there is a problem in that the heat generated from each other affects each other's light emission state and the light output decreases.

  The present invention has been made to solve such a problem, and provides a light source unit and a vehicle headlamp capable of suppressing two light source modules from being affected by heat generated by each of the light source modules. With the goal.

  In order to achieve the above object, an aspect of the light source unit according to the present invention includes a heat sink having a light source arrangement portion, a first light source module and a first light source module arranged in the light source arrangement portion so as to sandwich the light source arrangement portion. 2 light source modules, and a reflector that reflects the light of the first light source module and the second light source module, and is sandwiched between the first light source module and the second light source module in the light source arrangement unit. The gap is provided with a gap.

  Further, in one aspect of the light source unit according to the present invention, the first light source module and the second light source module are arranged so as to sandwich the light source arrangement portion from above and below, and the gap is defined as the light source. It is good also as forming by separating a part of arrangement | positioning part up and down.

  In the aspect of the light source unit according to the present invention, the light source arrangement unit includes a first light source arrangement unit in which the first light source module is arranged and a second light source arrangement in which the second light source module is arranged. It is good also as having a connection part which connects a part and a said 1st light source arrangement | positioning part and a said 2nd light source arrangement | positioning part.

  Moreover, 1 aspect of the light source unit which concerns on this invention WHEREIN: The said connection part is good also as the back side part of the said 1st light source arrangement | positioning part, and the back side part of the said 2nd light source arrangement | positioning part being connected.

  Moreover, the one aspect | mode of the light source unit which concerns on this invention WHEREIN: The said light source arrangement | positioning part is good also as being comprised by extending a part of said heat sink.

  Further, in one aspect of the light source unit according to the present invention, the first light source module and the second light source module may be arranged to be shifted in the front-rear direction or the left-right direction.

  Further, in one aspect of the light source unit according to the present invention, the light shielding member includes a light shielding member that shields a part of light of at least one of the first light source module and the second light source module reflected by the reflector. It is good also as a part of being inserted in the said clearance gap.

  Further, in one aspect of the light source unit according to the present invention, at least one of the first light source module and the second light source module may be disposed obliquely toward the reflector.

  An aspect of the vehicle headlamp according to the present invention includes a light source unit according to any one of the above aspects, a housing for mounting the light source unit, and an optical member disposed in front of the light source unit. It is characterized by providing.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that two light source modules are mutually influenced by the heat which generate | occur | produces in each.

FIG. 1A is a perspective view of a light source unit according to an embodiment of the present invention when viewed from the front and obliquely above. FIG. 1B is a perspective view of the light source unit according to the embodiment of the present invention when viewed from the rear and obliquely above. 2A is a front view of the light source unit according to the embodiment of the present invention, FIG. 2B is a top view of the light source unit, and FIG. 2C is a bottom view of the light source unit. 2 (d) is a left side view of the light source unit, and FIG. 2 (e) is a right side view of the light source unit. FIG. 3 is an exploded perspective view of the light source unit according to the embodiment of the present invention. FIG. 4A is a cross-sectional perspective view of the light source unit according to the embodiment of the present invention as viewed from obliquely upward on the front surface side. FIG. 4B is a sectional view of the light source unit according to the embodiment of the present invention when FIG. 4A is viewed from the side. FIG. 5 is a perspective view when the reflector and the light shielding member are removed from the light source unit according to the embodiment of the present invention. FIG. 6 is a perspective view of the first light source module in the light source unit according to the embodiment of the present invention. FIG. 7 is a perspective view of the reflector in the light source unit according to the embodiment of the present invention as seen from the back side. FIG. 8A is a perspective view when the heat sink in the light source unit according to the embodiment of the present invention is viewed from the front side. FIG. 8B is a perspective view when the heat sink in the light source unit according to the embodiment of the present invention is viewed from the back side. FIG. 9 is a perspective view of a light shielding member in the light source unit according to the embodiment of the present invention. FIG. 10 is a diagram illustrating a region where the light source module in the light source unit according to the embodiment of the present invention cannot be directly viewed. FIG. 11 is a diagram showing a simulation result of heat distribution near the light source unit in the light source unit according to the embodiment of the present invention. FIG. 12A is a perspective view of a light source unit according to Modification 1 of the embodiment of the present invention. FIG. 12B is a perspective view of a light source unit according to Modification 1 of the embodiment of the present invention. FIG. 13A is a diagram for explaining a path of light emitted from the first light source module in the light source unit according to the embodiment of the present invention. FIG. 13B is a diagram for describing a path of light emitted from the first light source module in the light source unit according to Modification 1 of the embodiment of the present invention. FIG. 13C is a diagram for describing a path of light emitted from the first light source module in the light source unit according to Modification 1 of the embodiment of the present invention. FIG. 14A is a perspective view of a light source unit according to Modification 2 of the embodiment of the present invention when viewed from obliquely upward on the front side. FIG. 14B is a perspective view when the light source unit according to Modification 2 of the embodiment of the present invention is viewed obliquely from above and rearward. FIG. 15A is a front view of a light source unit according to Modification 2 of the embodiment of the present invention, FIG. 15B is a top view of the light source unit, and FIG. 15C is the light source unit. FIG. 15D is a bottom view of the light source unit, and FIG. 15E is a right side view of the light source unit. FIG. 16A is a perspective view of a light shielding member in a light source unit according to Modification 2 of the embodiment of the present invention. FIG. 16B is a perspective view of the light shielding member in the light source unit according to Modification 2 of the embodiment of the present invention. FIG. 17 is a diagram illustrating a state when the direction of the light source unit according to the second modification of the embodiment of the present invention is changed. FIG. 18 is a schematic cross-sectional view of the vehicle headlamp according to the embodiment of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an illumination light source and an illumination device according to embodiments of the present invention will be described with reference to the drawings. Note that each of the embodiments described below shows a preferred specific example of the present invention. Accordingly, the numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps (steps), order of steps, and the like shown in the following embodiments are merely examples and are intended to limit the present invention. is not. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Further, in this specification, “front” is a direction in which light is emitted from the light source unit (light emission direction), and “rear” is a direction opposite to “front”. Unless otherwise specified, the descriptions “left”, “right”, “upper”, and “lower” refer to directions when the light source unit is viewed from the front. The vertical direction is the vertical direction, the front-rear direction is the optical axis direction of the light source unit in the horizontal direction, and the left-right direction is the direction perpendicular to both the vertical direction and the front-rear direction in the horizontal direction.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Overall configuration of the light source unit)
First, a schematic configuration of the light source unit 1 according to the embodiment of the present invention will be described with reference to FIGS. 1A, 1B, 2 and 3. FIG. 1A is a perspective view of the light source unit according to the embodiment of the present invention when viewed from obliquely upward on the front side, and FIG. 1B is a perspective view of the light source unit when viewed from obliquely upward on the rear side. 2A and 2B are diagrams showing the configuration of the light source unit according to the embodiment of the present invention, where FIG. 2A is a front view, FIG. 2B is a top view, FIG. 2C is a bottom view, and FIG. Left side view, (e) is a right side view. FIG. 3 is an exploded perspective view of the light source unit according to the embodiment of the present invention.

  A light source unit 1 according to the present embodiment is a light source unit used for a vehicle headlamp such as a headlight, for example, and as shown in FIGS. 1A to 3, 2 light source modules 20, a reflector 30, a heat sink 40, and a light shielding member 50. The light source unit 1 further includes a pressing spring 60, a drive circuit 70, and a circuit cover 80.

  The light source unit 1 in the present embodiment has a square shape, and has a mounting angle dimension of, for example, 85 mm as shown in FIG. Moreover, as shown in FIG.2 (e), the depth dimension (length of the depth direction) of the light source unit 1 is 65 mm, for example.

  Next, the components of the light source unit 1 according to the present embodiment and the connection relationship between the components will be described in detail with reference to FIGS. 1A to 3 with reference to FIGS. 4A, 4B, and 5. . 4A is a cross-sectional perspective view of the light source unit according to the embodiment of the present invention when viewed from obliquely above the front side, and FIG. 4B is a cross-sectional view of the light source unit when FIG. 4A is viewed from the side. It is. FIG. 5 is a perspective view when the reflector and the light shielding member are removed from the light source unit according to the embodiment of the present invention.

(Light source module)
The first light source module 10 and the second light source module 20 constitute a light source unit of the light source unit 1. The first light source module 10 is an LED module for a low beam that is a passing beam, and emits light when the road surface in front of the front is irradiated. On the other hand, the second light source module 20 is an LED module for a Hi beam (high beam) that is a traveling beam, and emits light when irradiating a far front.

  In the present embodiment, the light emission states of the first light source module 10 and the second light source module 20 can be selectively switched by the operation of the user (vehicle driver), and the drive circuit according to the operation of the user One of the first light source module 10 and the second light source module 20 emits light in response to a signal (power) from 70. Note that the first light source module 10 and the second light source module 20 may be configured to emit light at the same time instead of either the first light source module 10 or the second light source module 20.

  As shown in FIGS. 4A, 4B, and 5, the first light source module 10 and the second light source module 20 are arranged in the light source arrangement unit 41 so as to sandwich the light source arrangement unit 41 of the heat sink 40 from above and below. Yes. Specifically, the first light source module 10 is fixed to the upper surface of the light source arrangement portion 41 of the heat sink 40 with the light emitting surface facing upward. The second light source module 20 is fixed to the lower surface of the light source arrangement portion 41 with the light emitting surface facing downward. Although not shown, the first light source module 10 and the second light source module 20 are arranged in the light source arrangement unit 41 via a heat conductive material. Thereby, the heat which generate | occur | produces in the 1st light source module 10 and the 2nd light source module 20 can be efficiently conducted to the heat sink 40 (light source arrangement part 41).

  In the present embodiment, the first light source module 10 and the second light source module 20 are arranged so as to be shifted in the front-rear direction. Specifically, the first light source module 10 is arranged so as to be positioned in front of the second light source module 20. Thereby, it can suppress that the length (front-back length) of the depth direction of the light source unit 1 becomes long.

  That is, since the target light distribution pattern is different between the Low beam and the Hi beam, the positional relationship with respect to the reflecting surface of the reflector 30 is different between the first light source module 10 and the second light source module 20. For this reason, if the position of the 1st light source module 10 and the 2nd light source module 20 in the front-back direction is made the same, the front-back length of the light source unit 1 will become long. Therefore, in the present embodiment, the first light source module 10 and the second light source module 20 are shifted in the front-rear direction. As a result, the front-rear length of the light source unit 1 can be shortened. Thereby, the light source unit 1 can be reduced in size and weight. The amount of shift between the first light source module 10 and the second light source module 20 (distance from the front end of one substrate to the front end of the other substrate in the front-rear direction) is, for example, 5.0 mm to 20.0 mm.

  Note that the first light source module 10 and the second light source module 20 may be shifted in the left-right direction instead of being shifted in the front-rear direction. Even in this case, it is possible to prevent the length of the light source unit 1 from being increased. Moreover, you may shift the 1st light source module 10 and the 2nd light source module 20 to any direction of the front-back direction and the left-right direction.

  Here, the detailed structure of the 1st light source module 10 and the 2nd light source module 20 is demonstrated using FIG. FIG. 6 is a perspective view of the first light source module in the light source unit according to the embodiment of the present invention. In addition, since the 1st light source module 10 and the 2nd light source module 20 are the same structures, below, only the structure of the 1st light source module 10 is demonstrated.

  As shown in FIG. 6, the first light source module 10 is an LED unit (LED package) using LEDs, and includes a substrate 11 and a light emitting device (light emitting unit) 12 disposed on the substrate 11. .

  The substrate 11 includes a metal heat transfer plate (heat spreader) for conducting heat of the light emitting device 12 to the heat sink 40 and a wiring substrate disposed on the heat transfer plate. The wiring board includes an insulating base made of resin or the like, and metal wiring and electrode pads that are patterned in a predetermined shape on the insulating base. An insulating film is formed on the surface of the insulating base so as to expose the electrode pads. As the insulating film, for example, a highly reflective white resist can be used.

  As shown in FIG. 6, two electrode pads 11a are provided, and each electrode pad 11a is electrically connected to the LED chip of the light emitting device 12 via a metal wiring (not shown) and a bonding wire 11b. Has been. The electrode pad 11 a is a connection terminal that receives DC power for causing the light emitting device 12 to emit light, and is connected to a lead wire derived from the drive circuit 70. For example, a lead wire on the high voltage side (plus side) is connected to one of the two electrode pads 11a, and a lead wire on the low voltage side (minus side) is connected to the other.

  The light emitting device 12 is a light emitting unit that uses an LED as a light source, and is mounted on the substrate 11. The light emitting device 12 is, for example, a COB (Chip On Board) structure LED module in which an LED chip (bare chip) is directly mounted on a mounting substrate, and includes a mounting substrate 12a, an LED 12b mounted on the mounting substrate 12a, And a sealing material (not shown) for sealing the LED 12b.

  The mounting substrate 12a is a submount disposed on the substrate 11, and is a substrate for mounting the LED 12b. As the mounting substrate 12a, for example, a ceramic substrate made of aluminum oxide (alumina) or aluminum nitride, a metal base substrate made of resin-coated metal, a resin substrate made of resin, or the like can be used.

  A plurality of LEDs 12b are mounted on the mounting substrate 12a. Each LED 12b is a bare chip that emits monochromatic visible light, and is die-bonded on the mounting substrate 12a with a die attach material (die bond material). As the LED 12b (bare chip), for example, a blue LED chip that emits blue light when energized can be used. The blue LED chip is configured, for example, by sequentially stacking an n-type gallium nitride compound semiconductor layer, a light emitting layer made of a gallium nitride compound semiconductor containing indium, and a p-type gallium nitride compound semiconductor layer on a sapphire substrate. This is a gallium nitride based semiconductor light emitting device having a central wavelength of 400 nm to 480 nm. The chip size of the LED chip is, for example, about 1 mm square and the thickness is about 100 μm, but the chip size is not limited to this.

  The sealing material is formed on the mounting substrate 12a so as to collectively seal a plurality of LEDs 12b (for example, all the LEDs 12b) on the mounting substrate 12a. In addition, you may form a sealing material so that each LED12b may be sealed.

  The sealing material is mainly made of a light-transmitting material, but when it is necessary to convert the wavelength of light of the LED 12b to a predetermined wavelength, the wavelength converting material is mixed into the light-transmitting material. The sealing material in the present embodiment is a wavelength conversion member that includes a phosphor as a wavelength conversion material and converts the wavelength (color) of light emitted from the LED 12b.

  As a translucent material constituting the sealing material, for example, a silicone resin can be used. Note that not only the silicone resin but also a fluororesin, a hybrid resin of silicone resin and epoxy resin, a urea resin, or the like may be used.

  For example, when the LED 12b is a blue LED chip that emits blue light, for example, a YAG (Yttrium Aluminum Garnet) -based yellow phosphor may be used as the phosphor to be included in the encapsulant. it can. Thereby, a part of blue light emitted from the LED 12b is wavelength-converted to yellow light by the yellow phosphor included in the sealing material. And the blue light which was not absorbed by yellow fluorescent substance and the yellow light wavelength-converted by yellow fluorescent substance are mixed, and white light radiate | emits from a sealing material. Further, a light diffusing material such as silica particles may be dispersed in the sealing material. The yellow phosphor is not limited to the YAG phosphor, and a silicate phosphor, a nitride phosphor, an oxynitride phosphor, a sialon phosphor, a sulfide phosphor, or the like may be used.

  In addition, the wavelength conversion member may be provided separately from the sealing material, and may be provided directly or indirectly outside the sealing material.

(Reflector)
The reflector 30 is a reflecting member that reflects light from the first light source module 10 and the second light source module 20. The shape of the front surface (reflecting surface) of the reflector 30 is such that light emitted from the first light source module 10 and the second light source module 20 is reflected and directed in a predetermined direction.

  In this case, the light is reflected by the first reflecting portion (upper portion) 31 that reflects the light of the first light source module 10 and the second reflecting portion (lower portion) 32 that reflects the light of the second light source module 20. The surface shape may be different. Thereby, a desired beam pattern can be formed for each of the low beam and the high beam. In addition, for each of the first reflecting portion 31 and the second reflecting portion 32, the shape of the reflecting surface may be different between the right side portion and the left side portion. Thereby, a beam pattern asymmetrical with respect to the optical axis can be formed.

  Moreover, although the 1st reflection part 31 and the 2nd reflection part 32 may be comprised by a separate member, and it may arrange | position so that each reflection surface may become discontinuous, in this Embodiment, it is 1st reflection. The part 31 and the second reflection part 32 are integrally formed, and the reflection surface of the first reflection part 31 and the reflection surface of the second reflection part 32 are formed continuously. That is, the reflector 30 is composed of one part. By configuring the first reflecting portion 31 and the second reflecting portion 32 as one component, it is not necessary to form each separately, and the number of steps for creating the reflector can be reduced.

  The reflector 30 configured as described above can be manufactured, for example, by mirror-finishing the surface of the heat-resistant resin by metal deposition (for example, aluminum deposition).

  As shown in FIG. 3, FIG. 4A and FIG. 4B, the reflector 30 in the present embodiment is a substantially bowl-shaped (substantially dome-shaped) reflecting plate (reflecting mirror) in which a front surface serving as a reflecting surface is recessed. . In other words, the reflector 30 has a curved surface shape that protrudes rearward. The reflector 30 is arranged so that at least a part of the reflector 30 exists inside the recess 42 of the heat sink 40. That is, at least a part of the reflector 30 exists in a space surrounded by the recess 42.

  As shown in FIG. 7, a through hole 33 through which the light source arrangement portion 41 of the heat sink 40 is inserted is provided at a substantially central portion of the reflector 30. FIG. 7 is a perspective view of the reflector in the light source unit according to the embodiment of the present invention as seen from the back side.

  When fixing the reflector 30 and the heat sink 40, as shown in FIG. 4B, the light source arrangement portion 41 is inserted into the through hole 33 so that the back surface of the reflector 30 and the inner surface of the concave portion 42 of the heat sink 40 are brought close to each other. And a heat sink 40 are arranged.

  At this time, the reflector 30 is disposed so that the back surface of the reflector 30 and the front surface of the heat sink 40 (the inner surface of the recess 42) are separated from each other, and a gap (between the back surface of the reflector 30 and the front surface of the heat sink 40 ( Voids) exist.

  As shown in FIG. 7, two protrusions 34 that contact the heat sink 40 are provided on the back surface of the reflector 30.

  Specifically, as shown in FIG. 4B, the protrusion 34 is in contact with the bottom surface of a recess 42 a formed on the inner surface of the recess 42 of the heat sink 40. Thus, the relative positional relationship between the reflector 30 and the heat sink 40 is determined by bringing the protrusion 34 into contact with the bottom surface of the recess 42a. Therefore, the distance between the reflector 30 and the heat sink 40 can be set by the height of the protrusion 34. That is, by providing the protrusions 34, the relative positional relationship between the reflector 30 and the heat sink 40 can be easily determined with high accuracy.

  Moreover, in the present embodiment, the first light source module 10 and the second light source module 20 are fixed to the heat sink 40 (light source arrangement portion 41). Thereby, not only the relative positional relationship between the reflector 30 and the heat sink 40 but also the relative relationship between the first light source module 10 and the second light source module 20 and the reflector 30 with respect to the heat sink 40 by the protrusion 34. The relative positional relationship can be determined easily with high accuracy.

  Further, as shown in FIG. 7, the protruding portion 34 is provided with a screw hole 34 a. As shown in FIG. 4B, the reflector fixing screw 92 is inserted into the through hole 42b of the recess 42a from the back side of the heat sink 40 in a state where the protrusion 34 is in contact with the recess 42a. Screw into hole 34a. Thereby, the reflector 30 and the heat sink 40 can be fixed.

(heatsink)
The heat sink 40 is a heat radiating member for radiating the heat generated in the first light source module 10 and the second light source module 20 to the outside (in the atmosphere). Therefore, the heat sink 40 is preferably formed using a material having high thermal conductivity such as metal. The heat sink 40 is, for example, an aluminum die casting using an aluminum alloy such as Al-Si-Fe (HT-1) or Al-Si-Cu (ADC12). In the present embodiment, the surface of the heat sink 40 is anodized.

  Here, a detailed configuration of the heat sink 40 will be described with reference to FIGS. 8A and 8B. FIG. 8A is a perspective view when the heat sink in the light source unit according to the embodiment of the present invention is viewed from the front side, and FIG. 8B is a perspective view when the heat sink is viewed from the back side.

  As shown in FIGS. 8A and 8B, the heat sink 40 includes a light source placement portion 41, a recess 42 that opens to surround the light source placement portion 41, and a heat dissipation portion 43 provided on the back side (back side) of the recess 42. It is constituted by.

  The light source arrangement part 41 is a part for arranging the first light source module 10 and the second light source module 20, and is configured by extending a part of the heat sink 40. The light source arrangement portion 41 in the present embodiment is provided on the front side (front side) of the recess 42 and extends so as to extend forward from a substantially central portion (most recessed portion) of the recess 42. . In addition, the light source arrangement | positioning part 41 in this Embodiment is extended and extended beyond the inside of the recessed part 42. FIG. That is, when the heat sink 40 is viewed from the side, the front end portion of the light source arrangement portion 41 is visible.

  Moreover, a part of the light source arrangement part 41 is separated vertically. In the present embodiment, the light source arrangement portion 41 is configured to protrude in two upward and downward directions from the root portion on the concave portion 42 side, and is separated from each other with a gap (gap) therebetween. The light source arrangement unit 41a and the second light source arrangement unit 41b, and the connection unit 41c that connects the first light source arrangement unit 41a and the second light source arrangement unit 41b.

  Specifically, the substantially flat plate-like first light source arrangement portion 41a and the substantially flat plate-like second light source arrangement portion 41b are provided with a predetermined gap (gap) in the vertical direction, and the first light source The rear side portions of the placement portion 41a and the second light source placement portion 41b are connected by a connecting portion 41c. Accordingly, grooves 41d and 41e formed by a gap between the first light source arrangement portion 41a and the second light source arrangement portion 41b are formed on the front side surface and the left and right side surfaces of the light source arrangement portion 41.

  The groove 41d is formed on the front surface of the light source arrangement part 41, and extends from one of the left and right edges of the light source arrangement part 41 to the other when the light source arrangement part 41 is viewed from the front. The grooves 41e are formed on the left and right surfaces of the light source arrangement portion 41, and extend from the front side edge of the light source arrangement portion 41 to the connecting portion 41c when the light source arrangement portion 41 is viewed from the side. doing.

  Further, as shown in FIGS. 4A, 4B, and 5, the gap between the first light source arrangement portion 41a and the second light source arrangement portion 41b is directly below the first light source module 10 and the second light source module 20. It exists right above. That is, a gap is provided in the light source arrangement portion 41 between the first light source module 10 and the second light source module 20.

  Furthermore, as shown to FIG. 8A, the 1st light source arrangement | positioning part 41a is provided with the recessed part 41a1 for mounting the 1st light source module 10. As shown in FIG. Further, by providing the concave portion 41a1, the two convex portions 41a2 are provided in the first light source arrangement portion 41a. The convex portion 41a2 functions as a stopper for the substrate 11 of the first light source module 10, and the end portion of the substrate 11 contacts the convex portion 41a2. Thus, the position of the first light source module 10 is regulated by being placed in the recess 41a1.

  Similarly, the second light source arrangement portion 41b is provided with a concave portion 41b1 for placing the second light source module 20, and by providing the concave portion 41b1, the second light source arrangement portion 41b has two convex portions 41b2. Is provided. The convex portion 41b2 is also a stopper, and the substrate of the second light source module 20 contacts. Thus, the position of the second light source module 20 is regulated by being placed in the recess 41b1.

  Further, as shown in FIG. 8B, a screw hole 41c1 is provided on the rear surface of the connecting portion 41c. As shown in FIG. 4B, a holding spring fixing screw 91 inserted from the rear into the through hole 63 a of the holding spring 60 pushed into the rear portion of the light source arrangement portion 41 is screwed into the screw hole 41 c 1.

  As shown in FIGS. 4A and 4B, the recess 42 is formed to correspond to the shape of the reflector 30. The recess 42 in the present embodiment is recessed rearward and is formed so that the inner surface shape is a substantially hemispheric outer surface shape. Thus, the inner surface of the recess 42 is a concave surface.

  As shown in FIGS. 4B and 8A, the recess 42 is provided with two recesses 42 a corresponding to the two protrusions 34 of the reflector 30. A bottom surface with which the protrusion 34 abuts is formed in the recess 42a. The recess 42a is provided with a through hole 42b that penetrates the heat sink 40 in the front-rear direction. When the reflector 30 and the heat sink 40 are fixed, the reflector fixing screw 92 is inserted into the through hole 42b from the back side of the recess 42.

  Further, the recess 42 is provided with an insertion hole 42c. The insertion hole 42c is configured to allow the pressing spring 60 to be inserted therethrough. Specifically, as shown in FIG. 8B, one opening is formed on the back surface side of the recess 42, and the front surface side of the recess 42 has a first opening on each of the upper surface side and the lower surface side of the light source arrangement portion 41. Two openings are provided so that each of the first pressing portion 61 and the second pressing portion 62 is inserted. Note that lead wires for electrically connecting the first light source module 10 and the second light source module 20 to the drive circuit 70 are also inserted into the insertion holes 42c.

  The heat sink 40 is configured such that at least a part of the reflector 30 is positioned inside the recess 42 when the reflector 30 and the heat sink 40 are fixed. With this configuration, the length of the light source unit in the depth direction can be shortened compared to a conventional vehicle headlamp.

  Further, as described above, there is a predetermined gap (air gap) between the heat sink 40 and the reflector 30. As shown in FIGS. 4A and 4B, the heat sink 40 has a front surface (inner surface) of the recess 42. Are arranged so as to be separated from the back surface of the reflector 30. This gap is a region sandwiched between substantially spherical surfaces, and is configured to allow outside air to circulate. In the present embodiment, there is a gap over almost the entire area between the back surface of the reflector 30 and the inner surface of the concave portion 42 of the heat sink 40, and this gap serves as a flow path so that air can flow from four directions in the vertical and horizontal directions. Distribution is possible.

  With this configuration, air generated by natural convection can be circulated in the gap between the reflector 30 and the heat sink 40. Therefore, even if the front surface of the heat sink 40 is covered with the reflector 30, by providing a gap between the reflector 30 and the heat sink 40, the front surface portion of the heat sink 40, that is, the light source module side (heat source side) of the heat sink 40. The part can be cooled effectively. Thereby, the heat dissipation performance of the heat sink 40 can be improved. Therefore, the heat generated in the first light source module 10 and the second light source module 20 can be efficiently radiated. In particular, since the interior of the vehicle headlamp is sealed and almost airless, the first light source module 10 and the second light source are generated by cooling the heat sink 40 by generating natural convection as described above. The heat generated in the module 20 can be effectively dissipated.

  In the present embodiment, the inner surface shape of the recess 42 and the outer surface shape of the reflector 30 are substantially the same, and the distance between the heat sink 40 and the reflector 30 is substantially constant. However, the present invention is not limited to this.

  The heat dissipating part 43 is a main heat dissipating part in the heat sink 40 and dissipates the heat conducted to the heat sink 40 to the outside. In the heat sink 40, heat is also diffused from places other than the heat radiating portion 43.

  As shown in FIG. 4A, FIG. 4B, and FIG. 8B, the heat radiation part 43 is comprised by the heat radiation fin 43a. By providing the heat radiation fins 43a in this way, the surface area of the heat radiation portion 43 can be increased to increase the contact location with the outside air, so that the heat of the heat sink 40 can be efficiently radiated.

  The radiation fins 43a are constituted by a plurality of plate-like members extending in the vertical direction (up and down direction). That is, the plurality of plate-like heat radiation fins 43a are provided side by side in the left-right direction so that each of the plurality of plate-like heat radiation fins 43a is erected from the back surface of the recess 42.

  The radiating fins 43a other than the left and right ends are formed on the back surface of the concave portion 42 protruding rearward, but are formed so that the rear edge is flush. That is, the width (height) of the radiating fins 43a is wide → narrow → wide from the top to the bottom. In addition, the heat radiating fins 43a at the left and right ends constitute an outline of the heat radiating portion 43 and are exposed so that the outer surface can be seen from the outside even after the circuit cover 80 is attached to the heat sink 40.

  Each of the heat radiating fins 43a other than the left and right ends is provided with a groove 43a1 at the end on the rear side. The end of the upper side wall 82a of the circuit cover 80 is fitted into the groove 43a1. As a result, the vertical position of the circuit cover 80 with respect to the heat sink 40 is restricted.

  A notch 43a2 is provided at the lower end of the radiating fin 43a. The lower side wall portion 82b of the circuit cover 80 is hooked on the notch 43a2.

  Further, as shown in FIGS. 1A, 1B, and 2, claw portions 82c1 provided on the right side wall portion 82c and the left side wall portion 82d of the circuit cover 80 are provided on the outer surfaces of the heat radiating fins 43a at the left and right ends. And the inner surface of 82d1 contacts. Thereby, the position of the circuit cover 80 in the left-right direction with respect to the heat sink 40 is restricted. A through hole 43a3 is provided in each of the heat dissipating fins 43a at the left and right ends. The protrusions 82c2 and 82d2 provided on the right wall 82c and the left wall 82d of the circuit cover 80 are hooked on the through hole 43a3 so as to be hooked. Thereby, the circuit cover 80 can be fixed to the heat sink 40.

  As shown in FIG. 4B, a space region S that extends in the vertical direction and the front-rear direction is formed between the adjacent radiating fins 43a. In the present embodiment, a top plate (heat radiating plate) 43b is provided above the radiating fin 43a so as to straddle the radiating fin 43a. As a result, the portion directly above each space region S is blocked by the top plate 43b.

  Further, after the circuit cover 80 is attached to the heat sink 40, most of the rear side of each space region S is blocked by the circuit cover 80. As shown in FIG. Even after the circuit cover 80 is attached to the heat sink 40, an opening (vent hole) is provided in the upper part on the rear side of each space region S. That is, for the upper region of each space region S, the portion directly above is closed, but the upper rear portion is open.

  On the other hand, as shown in FIG. 2C and FIG. 4B, since no heat radiating plate is provided below the heat radiating fins 43 a, even after the circuit cover 80 is attached to the heat sink 40, The area is open and there is an opening (vent).

  Thus, in this embodiment, even after the circuit cover 80 is attached to the heat sink 40, the space region S between the heat radiation fins 43a extending in the vertical direction can be ventilated in two places in the vertical direction. The opening (vent hole) remains. With this configuration, natural convection of air from the bottom to the top can be generated in the radiation fins 43a through the openings in the upper region and the lower region in the space region S. Accordingly, even if the back surface of the heat sink 40 is covered with the circuit cover 80, the back surface of the heat sink 40 can be effectively cooled, and the heat conducted to the heat sink 40 can be efficiently dissipated into the atmosphere. Can do. Therefore, the heat generated in the first light source module 10 and the second light source module 20 can be efficiently radiated.

  Further, in the present embodiment, as shown in FIG. 4B, each of the plurality of space regions S formed by the radiation fins 43a and the peripheral region of the drive circuit 70 are spatially coupled. Thereby, the drive circuit 70 can also be effectively cooled by causing the air to flow by natural convection by providing openings at the upper and lower portions of the space region S as described above. In particular, in the present embodiment, since the component mounting surface of the circuit board 71 faces the heat radiating fins 43a, the circuit elements can be directly cooled. Therefore, the heat generated in the circuit element can be efficiently radiated through the space region S.

  In particular, as described above, since the interior of the vehicle headlamp is almost free of wind, natural convection is generated in the space region surrounded by the heat sink 40 and the circuit cover 80 to cool the heat sink 40 and the drive circuit 70. By doing so, the heat generated in the first light source module 10 and the second light source module 20 and the heat generated in the drive circuit 70 can be effectively dissipated.

  In the present embodiment, the top plate 43b is provided on the upper portion of the radiation fin 43a, but the top plate 43b may not be provided. By not providing the top plate 43b, a straight air flow can be generated in the vertical direction, so that the heat dissipation performance of the heat sink 40 can be further improved.

  However, by providing the top plate 43b, when the light source unit 1 is attached to the housing of the vehicle headlamp, the user's finger can be prevented from entering the gap between the adjacent heat radiation fins 43a. Thereby, even when the drive circuit 70 exists in the vicinity of the radiating fins 43a as in the present embodiment, the user can charge the charging unit of the drive circuit 70 when the light source unit 1 is attached (for example, during replacement). Can be prevented, and the safety when the light source unit 1 is attached can be improved. Furthermore, by providing the top plate 43b, it is possible to prevent foreign matters such as dust or liquids such as water droplets and oil droplets from entering the driver section (the drive circuit 70 and the circuit cover 80). Thereby, the light source unit excellent in reliability is realizable.

  Moreover, in this Embodiment, although the several plate-shaped thermal radiation fin 43a extended in a perpendicular direction was arranged in the left-right direction, you may arrange in any direction. For example, a plurality of plate-like heat radiation fins 43a extending in the left-right direction may be arranged in the vertical direction.

  However, since warm air moves from bottom to top, it is natural to arrange a plurality of plate-shaped heat radiation fins 43a extending in the vertical direction (vertical direction) in the left-right direction as in this embodiment. Smooth air flow by convection can be realized.

  As shown in FIG. 8A, attachment holes 44 are provided in each of the four corners of the heat sink 40. The attachment hole 44 is used when the light source unit 1 is attached to the housing of the vehicle headlamp. For example, the light source unit 1 can be attached to the housing of the vehicle headlamp by inserting a screw into the attachment hole 44 from the back or front and screwing.

  With this configuration, since only the light source unit 1 can be easily replaced, the cost of parts at the time of replacement can be reduced. In other words, in the vehicle headlamp using the existing LED, the LED light source (light source unit) is larger than the opening of the vehicle headlamp and has a complicated mounting form. , Flickering, dimming), the vehicle headlamps had to be replaced. On the other hand, in the present embodiment, by providing a hole or opening corresponding to the mounting hole 44 at an appropriate location on the vehicle headlamp, the light source unit 1 can be used when a problem occurs in the light source unit 1. Only unit 1 can be easily replaced.

  In addition, by attaching the light source unit 1 to the housing of the vehicle headlamp using the mounting hole 44, it is possible to easily perform an operation mechanism design such as aiming and leveling of the vehicle headlamp.

  In the present embodiment, the hole diameter of the mounting hole 44 is 5.5 mm, but the present invention is not limited to this. Further, the mounting holes 44 are provided at four corners of the heat sink 40, but the present invention is not limited to this. The mounting holes 44 are preferably provided at least at two corners.

(Light shielding member)
The light shielding member 50 is a separator that partitions a concave space surrounded by the reflector 30, and the first light source module 10 and the first light source module 10 reflected by the reflector 30 to form two predetermined beam patterns (light distribution patterns). A part of at least one light of the two light source modules 20 is shielded. The predetermined two types of beam patterns are beam patterns based on two beams traveling at different angles, and in this embodiment, a beam pattern based on a Hi beam and a beam pattern based on a Low beam.

  Further, the light shielding member 50 in the present embodiment shields part of the light from both the first light source module 10 and the second light source module 20.

  For example, a part of the light emitted from the first light source module 10 and reflected by the first reflecting portion (upper portion) 31 of the reflector 30 and traveling obliquely downward is blocked by the upper portion of the light blocking member 50. . Thus, a predetermined low beam pattern is formed, and a low beam cut-off line is formed.

  On the other hand, a part of the light emitted from the second light source module 20 and reflected by the second reflecting portion (lower portion) 32 of the reflector 30 and traveling obliquely upward is blocked by the lower portion of the light blocking member 50. Thus, a predetermined Hi beam pattern is formed.

  The light shielding member 50 also shields light that directly reaches the light shielding member 50 among the light emitted from the first light source module 10 and the second light source module 20.

  The light shielding member 50 is a light absorbing member that actively absorbs light, and the surface of the light shielding member 50 is configured to suppress reflection of light. The reflectance with respect to visible light on the surface of the light shielding member 50 is at least lower than the reflectance of the reflector 30, and the reflectance of the surface of the light shielding member 50 is, for example, 0.1% to 10.0%. Can do.

  Further, the surface roughness Ra of the light shielding member 50 is preferably 0.5 μm or more. Thereby, the reflectance of the light shielding member 50 can be easily reduced to 10% or less. The surface roughness Ra of the light shielding member 50 is preferably 1.0 μm ≦ Ra ≦ 10.0 μm. Thereby, a reflectance can be reduced more suitably. More preferably, 2.0 μm ≦ Ra ≦ 5.0 μm.

  In the present embodiment, since the first light source module 10 and the second light source module 20 emit white light (visible light), the surface of the light shielding member 50 is black. Thereby, white light can be absorbed well on the surface of the light shielding member 50, so that reflection of light by the light shielding member 50 can be suppressed.

  For example, when the first light source module 10 is turned on and a Low beam is emitted, the light reaching the light shielding member 50 is absorbed by the light shielding member 50. Thereby, reflection of the light in the light shielding member 50 can be suppressed. As a result, the occurrence of glare can be suppressed and a desired beam pattern can be obtained. In addition, a clear cut-off line can be issued.

  The color of the surface of the light shielding member 50 may be a color other than black as long as it absorbs light emitted from the first light source module 10 and the second light source module 20 and suppresses light reflection. For example, the surface of the light shielding member 50 may be a dark color such as brown or gray, and if the emission color of the first light source module 10 and the second light source module 20 is other than white, other colors are used. Also good.

  Furthermore, the surface of the light shielding member 50 is subjected to a low reflection treatment for suppressing light reflection, and for example, a matte surface treatment can be performed. In the present embodiment, the entire surface of the light shielding member 50 is black matte. In this way, by applying a matte surface treatment to the light shielding member 50, it is possible to further suppress the light from the first light source module 10 and the second light source module 20 from being reflected by the light shielding member 50. Thereby, a desired beam pattern can be obtained with higher accuracy.

  The surface treatment for suppressing the reflection of light is not limited to the matte treatment, and other low reflection treatments can be used. For example, an antireflection coating can be applied to the light shielding member 50, an antireflection film can be provided on the light shielding member 50, or a chemical conversion treatment such as alumite (anodized film) can be applied to the light shielding member 50.

  The light shielding member 50 can be made of, for example, a nonmetallic material such as resin. In the case where a resin is used as the material of the light shielding member 50, the light shielding member 50 is disposed in the vicinity of the first light source module 10 and the second light source module 20 that are at a high temperature, and therefore heat resistant such as polyphenylene sulfide resin (PPS resin). It is preferable to comprise with resin.

  Here, a detailed configuration of the light shielding member 50 will be described with reference to FIG. FIG. 9 is a perspective view of a light shielding member in the light source unit according to the embodiment of the present invention.

  As shown in FIG. 4A and FIG. 9, the light shielding member 50 is provided on the both sides of the central portion 51 connected to the front end portion of the light source arrangement portion 41 and in the left-right direction toward the reflector 30. And a pair of side portions 52 extending.

  As shown in FIG. 9, the central portion 51 is a front-facing surface that is a front-facing surface and a front surface that is a flat surface extending in the vertical direction and the left-right direction, and each of the upper end portion and the lower end portion of the front surface portion 51 a. It is comprised by a pair of upper side extension part 51b and the lower side extension part 51c extended so that it might protrude toward back.

  The vertical width of the front surface of the front surface portion 51 a is configured to be larger than the width of the front surfaces of the pair of side portions 52. Further, as shown in FIG. 4B, the height of the front surface portion 51 a is higher than the height of the first light source module 10. That is, the upper end edge of the front surface portion 51 a is at a position higher than the highest portion of the first light source module 10. Moreover, the width of the front surface portion 51 a in the left-right direction is longer than the width of the first light source module 10. By configuring the front surface of the front surface portion 51a in this way, the first light source module 10 is hidden by the front surface portion 51a when viewed from the front.

  Similarly, the second light source module 20 is arranged so as to be hidden by the front surface portion 51a when viewed from the front.

  Further, the upper extending portion 51b and the lower extending portion 51c are extended to positions overlapping the front end portions of the substrate 11 of the first light source module 10 and the second light source module 20, respectively. In the present embodiment, since the second light source module 20 is arranged to be shifted rearward from the first light source module 10, the length of the lower extension 51c is longer than the length of the upper extension 51b. long.

  By configuring the central portion 51 in this way, as shown in FIG. 10, an area where the light source unit (the first light source module 10 and the second light source module 20) is directly viewed is limited. It can reduce the illusion caused by direct viewing. In addition, FIG. 10 is a figure which shows the area | region where the light source module in the light source unit which concerns on embodiment of this invention cannot be directly viewed.

  As shown in FIG. 9, a laterally long convex portion 51 d that protrudes rearward is provided on the rear surface of the central portion 51 (the back surface of the front surface portion 51 a). The convex portion 51 d is fitted into the groove 41 d of the light source arrangement portion 41 when the light shielding member 50 is attached to the heat sink 40.

  Further, the pair of side portions 52 is a front surface 52a having a front surface that is a front surface and a flat surface extending in the vertical direction and the left and right direction, and the rear surface from each of the upper end portion and the lower end portion of the front surface portion 52a. And a pair of upper extending portions 52b and lower extending portions 52c, and an inner side surface portion 52d connecting the central portion 51 side portions of the upper extending portions 52b and the lower extending portions 52c. Yes.

  As shown in FIG. 4A, the upper extending portion 52b and the lower extending portion 52c in the side portion 52 extend rearward until they contact the reflecting surface of the reflector 30, and the upper extending portion 52b and The end edge shape of the rear side of the lower extension part 52 c on the reflector side is a shape along the shape of the reflection surface of the reflector 30. Thereby, the concave space area in the reflector 30 is completely partitioned into two upper and lower spaces by the side portion 52.

  Moreover, as shown in FIG. 9, the inner side surface part 52d of each of a pair of side part 52 is provided with the convex part 52e which protrudes in the left-right direction so that it may mutually face. The convex portion 52 e is a convex rail extending in the front-rear direction, and is provided at a connection portion of the light shielding member 50 with the light source arrangement portion 41. The convex portion 52e is fitted into the groove 41e of the light source arrangement portion 41 shown in FIG. For example, when the light shielding member 50 is attached to the heat sink 40, the convex portion 52e (rail) and the groove 41e of the light source placement portion 41 are fitted, and the light shielding member 50 is slid into the light source placement portion 41 backward. Let That is, the groove 41e is a rail groove configured to receive the convex portion (rail) 52e.

  With this configuration, the light shielding member 50 can be fixed to the light source placement portion 41 by sliding the convex portion 52e of the light shielding member 50 along the groove 41e of the light source placement portion 41 and pushing it. Accordingly, the light shielding member 50 and the heat sink 40 can be fixed and positioned at the same time without using a separate fixing member or positioning boss, and the light source unit 1 can be reduced in size and weight. Furthermore, the light shielding member 50 can be quickly assembled, and accurate positioning can be easily performed.

  In addition, by fitting the convex portion 52e of the light shielding member 50 into the groove 41e of the light source arrangement portion 41, the distance between the first light source arrangement portion 41a and the second light source arrangement portion 41b in the light source arrangement portion 41 is the first light source arrangement. Narrowing due to deformation or the like of the portion 41a or the second light source arrangement portion 41b can be suppressed. Thereby, the relative positional relationship between the first light source module 10 and the second light source module 20 and the reflector 30 can be continuously maintained.

  Further, the front part 51 a of the central part 51 is configured to expand in the vertical direction, and the vertical width of the front face of the front part 51 a of the central part 51 is the front face of the front part 52 a of the pair of side parts 52. It is larger than the vertical width. The front surface of the front surface portion 51a of the central portion 51 and the front surface of the front surface portion 52a of the pair of side portions 52 are flush with each other.

  As shown in FIGS. 4A and 4B, the light shielding member 50 configured in this manner is attached to the light source arrangement unit 41 so as to be positioned in front of the first light source module 10 and the second light source module 20. ing. Specifically, the light shielding member 50 is connected to the light source placement portion 41 so that the central portion 51 is connected to the front end surface of the light source placement portion 41 and the pair of side portions 52 are connected to the left and right side surfaces of the light source placement portion 41. It is attached. At this time, the front end portion of the light source arrangement portion 41 is located between the upper extending portion 51b and the lower extending portion 51c of the central portion 51.

(Presser spring)
As shown in FIGS. 4A, 4 </ b> B, and 5, the holding spring 60 holds the light source placement portion 41 and the first light source module 10 and the second light source module 20 placed in the light source placement portion 41. It is a member (clip).

  The first light source module 10 and the second light source module 20 are sandwiched by a pressing spring 60 with the light source arrangement portion 41 sandwiched therebetween. Thereby, the first light source module 10 and the second light source module 20 are fixed to the light source arrangement portion 41. That is, the holding spring 60 is a fixing member for simultaneously fixing the first light source module 10 and the second light source module 20 to the light source arrangement portion 41. Thus, the light source unit 1 can be reduced in size and weight by fixing the first light source module 10 and the second light source module 20 with one fixing member.

  The holding spring 60 in the present embodiment is a substantially U-shaped (substantially U-shaped) leaf spring, and as shown in FIGS. 3 and 4B, a plate-shaped first pressing portion 61 and a plate-shaped first spring. It is comprised by the 2 pressing part 62 and the plate-shaped connection part 63. FIG. The first pressing part 61 and the second pressing part 62 are connected by a connecting part 63 at a predetermined distance. The connecting portion 63 connects one end of the first pressing portion 61 and one end of the second pressing portion 62.

  Further, the connecting portion 63 is provided with a through hole 63a corresponding to the screw hole 41c1 provided on the rear surface of the light source arrangement portion 41. When the pressing spring 60 is fixed to the heat sink 40 (light source arrangement portion 41), a pressing spring fixing screw 91 is inserted into the through hole 63a.

  The holding spring 60 can be formed, for example, by bending a single rectangular metal plate. The holding spring 60 in the present embodiment is formed using SUS304 having a thickness of 0.8 mm.

  When fixing the 1st light source module 10 and the 2nd light source module 20 which are arrange | positioned at the light source arrangement | positioning part 41 using the presser spring 60 comprised in this way, as shown to FIG. 4B, the recessed part 42 of the heat sink 40 is shown. The holding spring 60 is inserted into the insertion hole 42c of the recess 42 from the rear surface of the first light source module, and the substrates of the first light source module 10 and the second light source module 20 are sandwiched.

  Specifically, each of the first pressing portion 61 and the second pressing portion 62 is inserted into each of the two insertion holes 42 c so that the first pressing portion 61 contacts the surface of the substrate of the first light source module 10. The pressing spring 60 is pushed forward while the second pressing portion 62 is in contact with the surface of the substrate of the second light source module 20.

  At this time, a pressing force is applied to the first light source module 10 and the second light source module 20 by the elastic force caused by the sandwiching between the first pressing portion 61 and the second pressing portion 62. For example, the distance between the first pressing part 61 and the second pressing part 62 is made smaller than the distance between the surface of the substrate of the first light source module 10 and the surface of the substrate of the second light source module 20. The above pressing force can be applied.

  Further, when the pressing spring 60 is pushed forward, a force is applied to the first light source module 10 and the second light source module 20 so as to be moved forward by pushing the pressing spring 60 forward. However, the convex portions 41a2 and 41b2 (see FIG. 5) provided in the light source arrangement portion 41 function as a stopper that stops the first light source module 10 and the second light source module 20 from moving forward. Thereby, only the pressing spring 60 moves forward so that the first pressing portion 61 and the second pressing portion 62 slide on the surfaces of the substrates of the first light source module 10 and the second light source module 20. As a result, the first light source module 10 and the second light source module 20 are fixed to the light source arrangement unit 41 so as to be pressed into the light source arrangement unit 41 by the holding spring 60.

  After the pressing spring 60 is pushed in until the connecting portion 63 contacts the rear surface of the light source arrangement portion 41, the pressing spring fixing screw 91 is inserted into the through hole 63a from the rear and the pressing spring fixing screw 91 is inserted. Is screwed into a screw hole 41c1 provided on the rear surface of the light source arrangement portion 41. Thereby, the presser spring 60 and the light source arrangement part 41 can be fixed by screwing.

  In the present embodiment, since the first light source module 10 is arranged to be shifted forward from the second light source module 20, the length of the first pressing portion 61 is longer than the length of the second pressing portion. It is getting longer.

  As described above, both the first light source module 10 and the second light source module 20 can be simultaneously fixed to the light source arrangement portion 41 by one pressing spring 60. Thereby, since it is not necessary to fix the 1st light source module 10 and the 2nd light source module 20 with a separate fixing member, while being able to reduce a fixing member, reducing the process for fixing, etc. And the process can be simplified.

  In this embodiment, the pressing spring 60 is fixed to the light source arrangement portion 41 by the pressing spring fixing screw 91, but the pressing spring fixing screw 91 may not be used. In other words, the pressing spring 60 may be fixed to the light source arrangement portion 41 only by the elastic force of the pressing spring 60. However, the pressing spring 60 can be fixed more securely by fixing the pressing spring 60 to the light source arrangement portion 41 using the pressing spring fixing screw 91.

(Drive circuit)
The drive circuit (driver) 70 is a circuit unit that performs drive control of the first light source module 10 and the second light source module 20. For example, the drive circuit 70 is a lighting circuit that stably supplies predetermined power to the first light source module 10 and the second light source module 20 and controls the first light source module 10 and the second light source module 20 to blink. . For example, the drive circuit 70 supplies direct-current power to the first light source module 10 or the second light source module 20 so as to cause one of the first light source module 10 and the second light source module 20 to emit light (light on). Supply. The drive circuit 70 is disposed inside the circuit cover 80.

  As shown in FIGS. 3, 4A, and 4B, the drive circuit 70 includes a circuit board (driver board) 71 and a plurality of circuit elements (not shown) mounted on the circuit board 71. An electric circuit for performing drive control of the first light source module 10 and the second light source module 20 is configured by the plurality of circuit elements.

  The circuit board 71 is, for example, a printed board (PCB board) in which a metal wiring such as a copper foil is patterned on one main surface (solder surface). The plurality of circuit elements are electrically connected to each other by metal wiring. The circuit board 71 can be, for example, a substantially rectangular one, but is not limited thereto.

  In the present embodiment, the circuit board 71 is fixed to the bottom portion 81 of the circuit cover 80 so that the solder surface faces the bottom surface of the bottom portion 81 of the circuit cover 80. That is, the circuit board 71 is disposed so that the surface opposite to the solder surface (component mounting surface) faces the heat sink 40. In the present embodiment, the mold resin for covering the entire circuit element is not formed in the circuit cover 80.

  Thereby, natural convection can be easily generated in the space region between the heat sink 40 (heat radiation fin 43a) and the circuit cover 80 (drive circuit 70), and the circuit element can be exposed to the air in the space region. The circuit elements can be directly cooled by air cooling. Therefore, the heat generated in the drive circuit 70 can be effectively radiated.

  The drive circuit 70 (circuit board 71), the first light source module 10 and the second light source module 20 are electrically connected by a plurality of output lead wires (power supply lead wires) or the like. For example, the pair of output lead wires for supplying DC power to the first light source module 10 and the pair of output lead wires for supplying DC power to the second light source module 20 are derived from the drive circuit 70. The first light source module 10 and the second light source module 20 are electrically connected through the insertion hole 42c.

  The drive circuit 70 is not directly attached to the heat sink 40 but is indirectly held by the heat sink 40. Specifically, a circuit cover 80 that houses the drive circuit 70 is attached to the heat dissipation portion 43 of the heat sink 40, and the drive circuit 70 is attached to the back surface of the heat sink 40 via the circuit cover 80.

(Circuit cover)
As shown in FIGS. 4A and 4B, the circuit cover (driver cover) 80 is configured to cover the drive circuit 70. The circuit cover 80 in the present embodiment is a circuit case, which houses the drive circuit 70 and holds the drive circuit 70. The circuit cover 80 can be made of metal, for example, but may be made of resin.

  As shown in FIG. 3, the circuit cover 80 has, for example, a box shape having an opening 80 a, a rectangular plate-like bottom (bottom plate) 81 to which the circuit board 71 of the drive circuit 70 is fixed, and the entire circumference of the bottom 81. And a side wall portion 82 that is configured so as to surround.

  The side wall portion 82 is constituted by four plate-like members standing on the four sides of the bottom portion 81. The side wall 82 in the present embodiment includes an upper side wall (upper side plate) 82a, a lower side wall (lower side plate) 82b, a right side wall (right side plate) 82c, and a left side wall (left side plate) 82d. . In addition, the upper side wall part 82a and the lower side wall part 82b face each other, and the right side wall part 82c and the left side wall part 82d face each other.

  In the present embodiment, adjacent portions (joint portions) of the upper side wall portion 82a, the lower side wall portion 82b, the right side wall portion 82c, and the left side wall portion 82d are not welded or the like and are not joined to each other. Thereby, a slight gap exists between adjacent portions of the upper side wall portion 82a, the lower side wall portion 82b, the right side wall portion 82c, and the left side wall portion 82d.

  A pair of claw portions 82c1 and 82d1 are provided on each of the right wall portion 82c and the left wall portion 82d. The claw portions 82c1 and 82d1 are formed by bending a part of the right side wall portion 82c and the left side wall portion 82d twice outward. The claw portions 82c1 and 82d1 are bent so as to be in contact with the outer surfaces of the heat radiating fins 43a at both left and right ends. As a result, as shown in FIG. 1A and FIG. It is possible to regulate the position of the direction.

  Further, as shown in FIGS. 3, 2 (d), and 2 (e), convex portions 82 c 2 and 82 d 2 are provided on the right side wall portion 82 c and the left side wall portion 82 d. As shown in FIGS. 1A and 1B, the convex portions 82c2 and 82d2 are hooked in through holes 43a3 provided in the heat radiating fins 43a at the left and right ends. Thereby, the circuit cover 80 can be fixed to the heat radiating portion 43. The convex portions 82c2 and 82d2 in the present embodiment are approximately the same size as the through hole 43a3, and are configured such that the convex portions 82c2 and 82d2 are fitted into the through holes 43a3 from the inside of the radiating fins 43a. .

  As shown in FIGS. 1B, 4A, and 4B, the circuit cover 80 configured as described above is fixed so as to cover the back surface of the heat sink 40 so that the openings 80a face the heat radiating fins 43a. Specifically, the end portion of the upper side wall portion 82a is fitted into the groove 43a1 of each radiating fin 43a, and the lower side wall portion 82b is hooked on the notch 43a2 of the radiating fin 43a. Further, the convex portions 82c2 and 82d2 of the right side wall portion 82c and the left side wall portion 82d are fitted into the through holes 43a3 of the radiating fins 43a at the left and right ends. Thereby, the circuit cover 80 can be fixed to the radiation fins 43a.

  Thus, in the present embodiment, the circuit cover 80 that holds the drive circuit 70 is fixed to the radiation fins 43a. That is, the drive circuit 70 and the circuit cover 80 are fixed to the back surface of the heat sink 40. As a result, the length of the heat sink in the depth direction can be shortened as compared with the case where the drive circuit is provided on the front surface of the heat sink as in Patent Document 1, and thus the increase in the weight of the heat sink can be suppressed.

  Moreover, in the present embodiment, the first light source module 10 and the second light source module 20 are fixed to the front surface of the heat sink 40, and the first light source module 10 and the second light source module 20 are driven. The circuit 70 is electrically connected by a connection cable such as a lead wire. That is, the driver unit (the drive circuit 70 and the circuit cover 80) and the light source unit (the first light source module 10 and the second light source module 20) are attached to one member (heat sink 40) instead of separate members. ing. Thereby, since a man-hour can be reduced, cost reduction can be achieved. In addition, since the number of parts can be reduced, a plurality of types of connection cables according to the layout are not required, and the light source unit 1 can be reduced in size and weight.

  In the present embodiment, the opening 80a of the circuit cover 80 is fixed to the heat radiation fin 43a so as to face the heat radiation fin 43a. Thereby, the space area enclosed by the radiation fin 43a and the circuit cover 80 can be enlarged. Therefore, air can easily circulate, and the cooling effect of the heat sink 40 and the drive circuit 70 can be improved.

  Moreover, in this Embodiment, the edge part of the upper side wall part 82a of the circuit cover 80 is engage | inserted in the groove | channel 43a1 of the radiation fin 43a. Thereby, the circuit cover 80 which has the opening part 80a in the radiation fin 43a side can be easily fixed to the radiation fin 43a. Further, the position of the circuit cover 80 can be easily regulated.

  Further, in the present embodiment, as shown in FIG. 1B, even after the circuit cover 80 is fixed to the radiating fins 43a, the radiating fins 43a at the left and right ends, the right side wall portions 82c, and the left side wall portions 82d There is also an opening (vent hole) leading to the space region S. Thereby, since air can be made to flow in and out also from the opening, natural convection in the space region S can be easily generated.

  In the present embodiment, as described above, there is a slight gap at the joint between adjacent side wall portions of the upper side wall portion 82a, the lower side wall portion 82b, the right side wall portion 82c, and the left side wall portion 82d. Thereby, since air can be made to flow in also from this clearance gap, it is easy to generate natural convection in the space region S.

  Further, as shown in FIGS. 2C and 3, an opening (vent hole) 82b1 is formed in the lower side wall portion 82b. Thereby, since air can be made to flow in from the opening 82b1, the drive circuit 70 can be cooled. In particular, in the present embodiment, as described above, the space region S formed by the radiation fins 43a and the peripheral region of the drive circuit 70 are spatially coupled, and the upper portion of the space region S is opened to be natural. It causes air circulation by convection. Thereby, the drive circuit 70 can be effectively cooled by injecting air from the opening 82b1.

(Example of the effect of the light source unit)
Next, an example of the effect of the light source unit 1 according to the present embodiment will be described.

  According to the light source unit 1 in the present embodiment, the gap between the first light source module 10 and the second light source module 20 in the light source arrangement portion 41 of the heat sink 40 is provided with a gap having a predetermined interval. Yes. Specifically, as shown in FIGS. 4A, 4B, and 5, a gap is provided between the first light source arrangement unit 41a and the second light source arrangement unit 41b in the light source arrangement unit 41, and the gap Exists immediately below the first light source module 10 and directly above the second light source module 20.

  In addition, the gap between the first light source arrangement part 41a and the second light source arrangement part 41b exists so as to expand in the horizontal direction, and the area where the gap exists is the first light source module 10 (substrate). And a region sandwiched between the second light source module 20 (substrate).

  With this configuration, the gap between the first light source arrangement part 41a and the second light source arrangement part 41b functions as a heat insulating layer of air, and thus occurs in each of the first light source module 10 and the second light source module 20. It is possible to reduce the influence (or influence) of each other by heat. For example, heat generated in the first light source module 10 and the second light source module 20 can be suppressed from being conducted from one to the other.

  Thereby, since it becomes possible to arrange | position the 1st light source module 10 and the 2nd light source module 20 closer, the light source unit 1 can be reduced in size and weight. Moreover, since the influence of mutual heat can be reduced, the lifetime of the first light source module 10 and the second light source module 20 can be extended.

  In particular, when the first light source module 10 and the second light source module 20 are caused to emit light at the same time, the effect is great because a significant temperature increase is caused by the heat generated by each other.

  In the present embodiment, the gap between the first light source arrangement unit 41a and the second light source arrangement unit 41b (the portion of the light source arrangement unit 41 sandwiched between the first light source module 10 and the second light source module 20). Is preferably in the range of 0.5 mm or more and 2.0 mm or less. When the gap is less than 0.5 mm, there is a possibility that the gap will be pulled by an impact or the like. On the other hand, when the said clearance exceeds 2.0 mm, it becomes difficult to make the size of the light source unit 1 compact. The gap is more preferably in the range of 1.0 mm to 1.5 mm. Thereby, it becomes easy to insert a part of the light shielding member 50 into the gap.

  In the present embodiment, a groove 41 d is provided at the front end of the light source arrangement portion 41. That is, as for the 1st light source arrangement | positioning part 41a and the 2nd light source arrangement | positioning part 41b, the back side part is connected by the connection part 41c, and the front side part is not connected.

  Thereby, it can suppress that a heat pool generate | occur | produces in the front edge part of the light source arrangement | positioning part 41, and the heat | fever which generate | occur | produces in the 1st light source module 10 and the 2nd light source module 20 is used for the 1st light source arrangement part 41a. And heat can be efficiently drawn to the rear side via the second light source arrangement portion 41b.

  Here, the heat distribution near the light source unit in the light source unit 1 according to the present embodiment will be described with reference to FIG. FIG. 11 is a diagram showing a simulation result of heat distribution near the light source unit in the light source unit according to the embodiment of the present invention. In addition, in FIG. 11, the heat distribution at the time of making only the 1st light source module 10 light-emit is shown.

  As shown in FIG. 11, it can be seen that the heat generated in the first light source module 10 is conducted to the rear side of the heat sink 40. Moreover, although the heat generated in the first light source module 10 is transmitted to both the first light source arrangement unit 41a and the second light source arrangement unit 42b from the heat distribution in the light source arrangement unit 41 shown in FIG. It can be seen that the light is transmitted more toward the rear side of the first light source arrangement portion 41a than to the second light source arrangement portion 42b side. That is, it can be seen that the second light source module 20 can be prevented from being thermally affected by the heat generated in the first light source module 10.

(Modification 1 of light source unit)
Next, a light source unit 1A according to Modification 1 of the embodiment of the present invention will be described with reference to FIGS. 12A and 12B. 12A and 12B are perspective views of a light source unit according to Modification 1 of the embodiment of the present invention.

  The light source unit 1A according to this modification differs from the light source unit 1 according to the above-described embodiment in the configuration of the light source arrangement unit and the arrangement of the light source modules in the heat sink. In addition, since the other structure is the same as the light source unit 1 in the said embodiment, description is abbreviate | omitted.

  As shown in FIGS. 12A and 12B, in the light source unit 1A according to this modification, the mounting surface of the light source module is inclined so that the light source arrangement portion 41A of the heat sink 40A gradually increases from the rear toward the front. ing.

  Specifically, the mounting surface (concave portion) of the first light source module 10 is inclined so that the thickness of the first light source arrangement portion 41Aa gradually increases from the rear toward the front. That is, the mounting surface of the first light source module 10 in the first light source arrangement portion 41Aa is inclined so as to approach the reflector 30 with respect to the first light source arrangement portion 41a in the above embodiment.

  Similarly, the mounting surface (concave portion) of the second light source module 20 is inclined so that the thickness of the second light source arrangement portion 41Ab gradually increases from the rear toward the front. That is, the mounting surface of the second light source module 20 in the second light source arrangement part 41Ab is inclined so as to approach the reflector 30 with respect to the second light source arrangement part 41b in the above embodiment.

  Thereby, the 1st light source module 10 and the 2nd light source module 20 are inclined and arrange | positioned so that the front end of a board | substrate may approach toward the reflector 30 with respect to the said embodiment.

  Here, the effect of the light source unit 1A according to this modification will be described with reference to FIGS. 13A to 13C. FIG. 13A is a diagram for explaining a path of light emitted from the first light source module in the light source unit according to the embodiment, and FIGS. 13B and 13C are first views of the light source unit according to the present modification. It is a figure for demonstrating the path | route of the light radiate | emitted from the light source module.

  In FIG. 13A to FIG. 13C, the solid line arrow indicates the effective light flux of the light emitted from the first light source module 10, and the broken line arrow is invalid among the light emitted from the first light source module 10. The luminous flux is shown.

  As shown in FIGS. 13A and 13B, when the reflector having the same shape is used, the light source unit 1A according to the present modification can reduce the ineffective luminous flux as compared with the light source unit 1 according to the above embodiment. In addition, the effective luminous flux can be increased.

  As a result, the light source unit 1A according to the present modification can be made brighter (higher performance) than the light source unit 1 according to the above-described embodiment, or if the brightness is comparable, the power consumption Can be reduced.

  On the other hand, as shown in FIGS. 13A and 13C, if the effective luminous flux is equivalent, the length L of the reflector in the depth direction can be shortened to reduce the size of the reflector, so that the light source unit can be reduced in size and weight. .

  Further, as in the present modification, the light source unit (the first light source module 10 and the second light source module 20) is arranged by tilting the first light source module 10 and the second light source module 20 obliquely. Since it is difficult to see directly, glare can be reduced.

(Modification 2 of the light source unit)
Next, a light source unit 1B according to Modification 2 of the embodiment of the present invention will be described with reference to FIGS. 14A, 14B, and 15. FIG. FIG. 14A is a perspective view of a light source unit according to Modification 2 of the embodiment of the present invention when viewed from obliquely upward on the front side. FIG. 14B is a perspective view when the light source unit according to Modification 2 of the embodiment of the present invention is viewed obliquely from above and rearward. FIG. 15A is a front view of a light source unit according to Modification 2 of the embodiment of the present invention, FIG. 15B is a top view of the light source unit, and FIG. 15C is the light source unit. FIG. 15D is a bottom view of the light source unit, and FIG. 15E is a right side view of the light source unit.

  The light source unit 1B according to this modification is different from the light source unit 1 according to the above-described embodiment in the configuration of the reflector 30B and the light shielding member 50B. In addition, since the other structure is the same as the light source unit 1 in the said embodiment, description is abbreviate | omitted.

  As shown in FIGS. 14A, 14B, and 15, in the light source unit 1B according to the present modification, the upper portion of the reflector 30B extends forward from the light shielding member 50B.

  Further, as shown in FIGS. 16A and 16B, the light shielding member 50 </ b> B is configured to surround the light emitting portions of the first light source module 10 and the second light source module 20. Specifically, the light shielding member 50B is connected to the lateral portions of the upper extending portion 51b of the central portion 51 and the upper extending portions 52b of the two side portions 52 with respect to the light shielding member 50 in the above embodiment. A light shielding wall 53a is provided. Further, a light shielding wall 53b is also provided at a location where the lateral side portions of the lower extended portion 51c of the central portion 51 and the lower extended portions 52c of the two side portions 52 are connected.

  The light shielding wall 53 a is configured to cover the side portion of the light emitting unit of the first light source module 10. Further, the light shielding wall 53b is configured to cover the side portion of the light emitting unit of the second light source module 20. The light shielding walls 53a and 53b are provided on the front side portion of the side portion 52 (for example, half of the side portion 52), and are not provided on the rear side (reflector side).

  In the light shielding member 50 </ b> B in this modification, the top and bottom identifying characters 54 a are formed on the side portions 54 of the side portions 52. Thereby, when attaching the light shielding member 50B to the light source arrangement part 41, the light shielding member 50B can be attached without making a mistake in the vertical direction.

  As described above, in the present modification, the upper portion (upper end portion) of the reflector 30B extends forward from the light shielding member 50B. With this configuration, glare caused by upward leaking light can be suppressed.

  Further, the light shielding member 50B in the present modification is provided with light shielding walls 53a and 53b as well as the upper extending portion 51b and the lower extending portion 51c. As a result, the light emitting portions of the first light source module 10 and the second light source module 20 are not only covered vertically by the upper extending portion 51b and the lower extending portion 51c, but also by the light shielding walls 53a and 53b. Is also covered. With this configuration, glare caused by light leaking upward and laterally can be suppressed.

  Here, as shown in FIG. 17, when the light source unit 1 </ b> B in the present modification is changed in direction and the light shielding property (glare suppression) of the light source unit 1 </ b> B is confirmed, the first light source module 10 can be seen from any direction. Is almost invisible, and it can be seen that the occurrence of glare can be suppressed. 17A to 17E show states when the direction (angle) of the light source unit 1B is changed by about 30 °. In this case, as shown in the angle 90 ° directly above (FIG. 17 (c)), the first light source module 10 can be seen a little with the light source unit 1B alone. When incorporated in the lighting, the first light source module 10 is almost invisible and the effect of glare is almost eliminated.

(Vehicle headlight)
Next, a vehicle headlamp 100 according to an embodiment of the present invention will be described with reference to FIG. FIG. 18 is a schematic cross-sectional view of the vehicle headlamp according to the embodiment of the present invention.

  As shown in FIG. 18, a vehicle headlamp 100 according to the present embodiment is a headlight used in a vehicle such as a two-wheeled vehicle or a four-wheeled vehicle, and includes the light source unit 1 according to the above-described embodiment, A housing 110 to which the light source unit 1 is attached and an optical member 120 disposed in front of the light source unit 1 are provided.

  The case 110 holds the light source unit 1 and holds the light source unit 1. For example, the housing 110 and the light source unit 1 can be fixed by screwing a screw inserted into the mounting hole 44 of the light source unit 1 into a screw hole provided in the housing 110. The housing 110 may be composed of a plurality of members.

  The optical member 120 is, for example, a translucent headlamp cover (front cover), and transmits the light from the light source unit 1 to the outside. Further, the optical member 120 may have a light diffusion function or a lens action.

  The interior of the vehicular headlamp 100 configured as described above is sealed and sealed so that water and dust do not enter the interior. In addition, a reflecting mirror or the like may be separately provided between the light source unit 1 and the optical member 120 in the vehicle headlamp 100.

  Thus, the light source unit 1 can be used as a light source of the vehicle headlamp 100. Instead of the light source unit 1, the light source units 1A and 1B according to the first and second modifications may be used.

(Other variations)
The light source unit and the vehicle headlamp according to the present invention have been described above based on the embodiments. However, the present invention is not limited to the above embodiments.

  For example, in the embodiment and the modification described above, the positioning of the reflector 30 and the heat sink 40 is performed by the projection (projection) 34 provided on the reflector 30 and the depression (depression) 42 a provided on the heat sink 40. However, conversely, the reflector 30 may be provided with a depression (depression) and the heat sink 40 may be provided with a projection (protrusion). In addition, in order to determine the relative positional relationship between the reflector 30 and the heat sink 40, it is only necessary that at least a protrusion is provided on one of the reflector 30 and the recess 42. In this case, the protrusion may be configured to protrude from one of the reflector 30 and the recess 42 toward the other and contact the other.

  Moreover, in the said embodiment and modification, although the LED module of the COB structure was used in the 1st light source module 10 and the 2nd light source module 20, even if it uses the LED module of a SMD (Surface Mount Device) structure. Good. For example, as an SMD type LED module, a package type in which an LED chip (light emitting element) is mounted in a recess (cavity) of a resin container and a sealing member (phosphor-containing resin) is enclosed in the recess. What was comprised by mounting two or more LED elements (SMD type LED element) on the board | substrate 11 can be used.

  Moreover, in the said embodiment and modification, although it comprised so that white light might be radiated | emitted with respect to a blue LED chip using a yellow fluorescent substance, it is not restricted to this. For example, in order to improve color rendering properties, a red phosphor or a green phosphor may be further mixed in addition to the yellow phosphor. Moreover, it is also possible to use a phosphor-containing resin containing a red phosphor and a green phosphor without using a yellow phosphor, and to radiate white light by combining this with a blue LED chip. it can.

  Moreover, in the said embodiment and modification, although the blue LED chip was used for the LED chip, you may use the LED chip which light-emits colors other than blue. For example, in the case of using an ultraviolet light emitting LED chip, a combination of phosphors that emit light in three primary colors (red, green, and blue) can be used as the phosphor. Furthermore, a wavelength conversion material other than a phosphor may be used. For example, as a wavelength conversion material, light of a certain wavelength, such as a semiconductor, a metal complex, an organic dye, or a pigment, is absorbed, and light having a wavelength different from the absorbed light. A material containing a substance that emits may be used.

  Moreover, although LED was illustrated as a light emitting element in the said embodiment and modification, other solid light emitting elements, such as semiconductor light emitting elements, such as a semiconductor laser, or EL elements, such as organic EL (Electro Luminescence) and inorganic EL, May be used.

  Moreover, in the said embodiment, although the light source unit demonstrated the case where it uses for vehicle headlamps used for vehicles, such as a two-wheeled vehicle or a four-wheeled vehicle, it does not restrict to this. For example, the light source unit can be applied to illumination devices other than the vehicle headlamps, for example, outdoor illumination devices such as road signs and signboards, or indoor illumination devices.

  In addition, any combination of the components and functions in the embodiment and the modification can be arbitrarily combined without departing from the gist of the present invention, and the form obtained by making various modifications conceived by those skilled in the art with respect to the embodiment and the modification. The embodiment realized by the above is also included in the present invention.

DESCRIPTION OF SYMBOLS 1, 1A, 1B Light source unit 10 1st light source module 11 Board | substrate 11a Electrode pad 11b Bonding wire 12 Light-emitting device 12a Mounting board 12b LED
20 Second light source module 30, 30B Reflector 31 First reflective portion 32 Second reflective portion 33, 42b, 43a3, 63a Through hole 34 Projection portion 34a, 41c1 Screw hole 40, 40A Heat sink 41, 41A Light source placement portion 41a, 41Aa 1st light source arrangement part 41a1, 41b1, 42 Recessed part 41a2, 41b2, 51d, 52e, 82c2, 82d2 Convex part 41b, 41Ab 2nd light source arrangement part 41c, 63 Connection part 41d, 41e, 43a1 Groove 42a Depression part 42c Insertion hole 43 Radiation part 43a Radiation fin 43a2 Notch 43b Top plate 44 Mounting hole 50, 50B Light shielding member 51 Center part 51a, 52a Front part 51b, 52b Upper extension part 51c, 52c Lower extension part 52 Side part 52d Inner side part 53a 53b Shading wall 54 Side 54a Character 60 holding spring 61 first holding part 62 second holding part 70 drive circuit 71 circuit board 80 circuit cover 80a opening 81 bottom 82 side wall 82a upper side wall 82b lower side wall 82b1 opening 82c right side wall 82c1, 82d1 claw 82d Left side wall portion 91 Holding spring fixing screw 92 Reflector fixing screw 100 Vehicle headlamp 110 Housing 120 Optical member

Claims (9)

A heat sink having a light source arrangement;
A first light source module and a second light source module arranged in the light source arrangement unit so as to sandwich the light source arrangement unit,
A reflector that reflects the light of the first light source module and the second light source module;
A groove is provided in a portion sandwiched between the first light source module and the second light source module in the light source arrangement portion,
One of the first light source module and the second light source module may emit light or may emit light simultaneously. The first light source module and the second light source module are arranged so as to sandwich the light source arrangement part from above and below,
The light source unit according to claim 1, wherein the groove is formed by vertically separating a part of the light source arrangement portion. The light source arrangement unit includes a first light source arrangement unit in which the first light source module is arranged, a second light source arrangement unit in which the second light source module is arranged, the first light source arrangement unit, and the second light source arrangement unit. The light source unit according to claim 1, further comprising a connecting portion that connects the light source arrangement portion. The light source unit according to claim 3, wherein the connecting portion connects a rear side portion of the first light source arrangement portion and a rear side portion of the second light source arrangement portion. The light source unit according to claim 1, wherein the light source arrangement unit is configured by extending a part of the heat sink. The light source unit according to claim 1, wherein the first light source module and the second light source module are arranged to be shifted in the front-rear direction or the left-right direction. A light shielding member that shields a part of light of at least one of the first light source module and the second light source module reflected by the reflector;
The light source unit according to claim 1, wherein a part of the light shielding member is inserted into the groove . The light source unit according to any one of claims 1 to 7, wherein at least one of the first light source module and the second light source module is disposed obliquely toward the reflector. The light source unit according to any one of claims 1 to 8,
A housing for mounting the light source unit;
A vehicle headlamp comprising: an optical member disposed in front of the light source unit.