Heat sink, light source unit, and method for manufacturing heat sink

Abstract

Provided is a heat sink having a novel structure that is easy to manufacture. This heat sink 32 includes a first mounting part 34a on which a first substrate is mounted, and a second mounting part 34b on which a second substrate is mounted. The first mounting part 34a extends in a vehicle front-rear direction, and a boss 42a used when the mounted first substrate is fastened to the first mounting part 34a is formed upward. The second mounting part 34b extends obliquely downward toward the front of the vehicle from the rear end of the first mounting part 34a, and a boss 46a used when fastening the mounted second substrate to the second mounting part 34b is formed downward. The boss 42a is formed such that a central axis Ax is in a normal direction Z of the main surface of the first mounting part 34a, and the bosses 46a, 46b are formed such that the central axis Ax is in the normal direction Z of the main surface of the first mounting part 34a.

Description

Heat sink, light source unit, and method for manufacturing a heat sink

[0001] The present invention relates to a heat sink used in a vehicle lamp.

[0002] Conventionally, various heat sinks have been devised to dissipate heat generated by a light source provided in a vehicle lamp. The heat sink has various shapes and irregularities such as a mounting surface on which a substrate on which a light source is mounted is placed, fins mainly serving as heat dissipation parts, pins and bosses for positioning and fastening when mounting other parts, and is formed as a single part having these complex shapes by die molding. For example, Patent Document 1 discloses a heat sink having two mounting surfaces that are non-parallel to each other so as to face the front of a vehicle headlamp.

[0003] International Publication No. 2019 / 176869

[0004] However, when forming a heat sink having two mounting surfaces that are non-parallel to each other by die molding, the normal line of at least one mounting surface is non-parallel to the mold opening direction. Therefore, when forming ribs on a mounting surface whose normal line is non-parallel to the mold opening direction, from the viewpoint of productivity, this rib tends to extend in the mold opening direction and be inclined with respect to the normal line of the mounting surface. As a result, it is necessary to additionally perform cutting processing so that the rib protrudes in the normal line direction of the mounting surface, and additional processing costs are incurred. Further, when forming a heat sink having two mounting surfaces that are non-parallel to each other by die molding, ribs can be formed in the normal line direction of each mounting surface, and by providing a slide structure in the mold, the ribs can be formed without cutting processing, but this leads to an increase in costs due to the complexity of the mold.

[0005] The present invention has been made in view of such circumstances, and one of its exemplary purposes is to provide a heat sink with a new structure that is easy to manufacture.

[0006] To solve the above problems, a heat sink according to one aspect of the present invention includes a first mounting section on which a first substrate on which a first light source having an upward-facing light-emitting surface is mounted is placed, a second mounting section on which a second substrate on which a second light source having a downward-facing light-emitting surface is mounted is placed, and a heat dissipation section that transfers and dissipates heat from the first mounting section and the second mounting section. The first mounting portion extends in the longitudinal direction of the vehicle, and has a first fastening boss formed facing upward, which is used when fastening the mounted first substrate to the first mounting portion. The second mounting portion extends diagonally downward toward the front of the vehicle from the rear end of the first mounting portion, and has a second fastening boss formed facing downward, which is used when fastening the mounted second substrate to the second mounting portion. The first fastening boss is formed so that its central axis is in the direction normal to the main surface of the first mounting portion, and the second fastening boss is formed so that its central axis is in the direction normal to the main surface of the first mounting portion.

[0007] According to this embodiment, a heat sink having two non-parallel mounting sections can be manufactured using a simple mold configuration.

[0008] Another aspect of the present invention is also a heat sink. This heat sink includes a first mounting section on which a first substrate on which a first light source having an upward-facing light-emitting surface is mounted is placed, a second mounting section on which a second substrate on which a second light source having a downward-facing light-emitting surface is placed, and a heat dissipation section that transfers and dissipates heat from the first mounting section and the second mounting section. The first mounting portion extends in the longitudinal direction of the vehicle, and has a first fastening boss formed facing upward, which is used when fastening the mounted first substrate to the first mounting portion. The second mounting portion extends diagonally from the rear end of the first mounting portion toward the front of the vehicle, and has a second fastening boss formed facing downward, which is used when fastening the mounted second substrate to the second mounting portion. The second fastening boss is formed so that its central axis is in the direction normal to the main surface of the second mounting portion, and the first fastening boss is formed so that its central axis is in the direction normal to the main surface of the second mounting portion.

[0009] According to this embodiment, a heat sink having two non-parallel mounting sections can be manufactured using a simple mold configuration.

[0010] Yet another aspect of the present invention is also a heat sink. This heat sink comprises a first mounting section on which a first substrate on which a first light source having an upward-facing light-emitting surface is mounted is placed, a second mounting section on which a second substrate on which a second light source having a downward-facing light-emitting surface is placed, and a heat dissipation section that transfers and dissipates heat from the first mounting section and the second mounting section. The first mounting portion extends in the longitudinal direction of the vehicle, and a first fastening boss, used when fastening the mounted first substrate to the first mounting portion, is formed facing upward. The second mounting portion extends diagonally downward from the front end of the first mounting portion toward the rear of the vehicle, and a second fastening boss, used when fastening the mounted second substrate to the second mounting portion, is formed facing downward. The first fastening boss is formed so that its central axis is in the direction normal to the main surface of the first mounting portion, and the second fastening boss is formed so that its central axis is in the direction normal to the main surface of the first mounting portion.

[0011] According to this embodiment, a heat sink having two non-parallel mounting sections can be manufactured using a simple mold configuration.

[0012] Yet another aspect of the present invention is also a heat sink. This heat sink comprises a first mounting section on which a first substrate on which a first light source having an upward-facing light-emitting surface is mounted is placed, a second mounting section on which a second substrate on which a second light source having a downward-facing light-emitting surface is placed, and a heat dissipation section that transfers and dissipates heat from the first mounting section and the second mounting section. The first mounting portion extends in the longitudinal direction of the vehicle, and has a first fastening boss facing upward, which is used when fastening the mounted first substrate to the first mounting portion. The second mounting portion extends diagonally from the front end of the first mounting portion toward the rear of the vehicle, and has a second fastening boss facing downward, which is used when fastening the mounted second substrate to the second mounting portion. The second fastening boss is formed so that its central axis is in the direction normal to the main surface of the second mounting portion, and the first fastening boss is formed so that its central axis is in the direction normal to the main surface of the second mounting portion.

[0013] According to this embodiment, a heat sink having two non-parallel mounting sections can be manufactured using a simple mold configuration.

[0014] The angle between the main surface of the first mounting portion and the main surface of the second mounting portion may be 10° or more. This makes it possible to manufacture a heat sink with two non-parallel mounting portions without using the slide mold that is normally required, even when the angle between the two mounting surfaces is relatively large.

[0015] The second mounting portion may have a restricting portion that restricts the position of the edge of the second substrate in the vehicle's longitudinal direction. This eliminates the need to use the second fastening boss for positioning, and the second fastening boss can be formed on the second mounting surface such that its central axis is not parallel to the normal direction of the main surface of the second mounting surface.

[0016] The second mounting portion may have positioning pins formed facing downwards to restrict the position of the second substrate in the vehicle width direction. This allows the second substrate to be positioned in the vehicle width direction relative to the second mounting portion without using the second fastening portion.

[0017] Another aspect of the present invention is a light source unit. This light source unit comprises a heat sink, a first substrate mounted on a first mounting portion and on which a first light source having an upward-facing light-emitting surface is mounted, a second substrate mounted on a second mounting portion and on which a second light source having a downward-facing light-emitting surface is mounted, a reflector mounted on the second substrate and reflecting light emitted from the second light source forward, and a screw fastened to a second fastening boss. The second substrate has an elongated hole through which the second fastening boss passes, and the reflector has a hole through which the second fastening boss passes. The second substrate and the reflector are fixed to the second mounting portion by fastening the screw to the second fastening boss with the second fastening boss inserted into the elongated hole formed in the second substrate and the hole formed in the reflector.

[0018] According to this embodiment, the second fastening boss only needs to have the function (shape) of fastening the second substrate or reflector to the heat sink, which increases the degree of freedom in shape when manufacturing with a mold.

[0019] The second mounting portion may include a regulating portion that regulates the position of the edge of the second substrate in the vehicle's longitudinal direction, and a positioning pin that regulates the position of the second substrate in the vehicle's width direction. This allows the second substrate to be positioned at a predetermined location on the second mounting portion without using a second fastening boss.

[0020] A further aspect of the present invention is a method for manufacturing a heat sink. This manufacturing method may include a step of removing a first mold in the direction normal to the main surface of a first mounting portion or a second mounting portion, and a step of removing a second mold in the direction directly opposite to the direction in which the first mold was removed. This makes it possible to manufacture a heat sink having two non-parallel mounting portions without using a slide mold.

[0021] Any combination of the above components, or any conversion of the expression of the present invention between manufacturing methods, devices such as luminaires and lighting fixtures, light-emitting modules, light sources, etc., are also valid embodiments of the present invention.

[0022] According to the present invention, it is possible to provide a heat sink with a new structure that is easy to manufacture.

[0023] This is a schematic side view of a vehicle light fixture according to this embodiment. This is a perspective view of a heat sink according to this embodiment. This is a bottom view of a heat sink according to this embodiment. This is a side view of a heat sink according to this embodiment. This is a cross-sectional view of the heat sink shown in Figure 3 along line A-A. This is a cross-sectional view of the heat sink shown in Figure 3 along line B-B. Figure 7(a) is an enlarged view of area C in Figure 5, and Figure 7(b) is an enlarged view of area D in Figure 5.

[0024] The present invention will be described below with reference to the drawings, based on preferred embodiments. The same or equivalent components, members, and processes shown in each drawing will be denoted by the same reference numerals, and redundant descriptions will be omitted as appropriate. Furthermore, the embodiments are illustrative and not limiting, and not all features or combinations thereof described in the embodiments are necessarily essential to the invention.

[0025] Furthermore, in the embodiments, the "front-rear direction," "up-down direction," and "left-right direction" of the vehicle, lighting fixture, and heat sink are relative directions defined for the convenience of explanation, with respect to the vehicle lighting fixture shown in Figure 1 and the heat sink shown in Figure 2, which will be described later. More specifically, when the vehicle lighting fixture is mounted on a vehicle, the direction in which light is emitted from the front may be defined as the "front" direction of the vehicle, and the opposite direction may be defined as the "rear" direction. Also, the direction above the vehicle perpendicular to the front-rear direction may be defined as the "up" direction, and the opposite direction may be defined as the "down" direction. In addition, the direction perpendicular to the front-rear direction and the up-down direction of the vehicle may be defined as the left direction when facing the front of the vehicle, and the opposite direction may be defined as the "right" direction.

[0026] Figure 1 is a schematic side view of a vehicle light fixture according to this embodiment. The vehicle light fixture 10 shown in Figure 1 comprises a lamp housing 12, a light-transmitting cover 14 that covers the opening 12a of the lamp housing 12, and a light source unit 18 disposed within a lamp chamber 16 formed by the lamp housing 12 and the light-transmitting cover 14. The vehicle light fixture 10 shown in Figure 1 is a vehicle headlight and is configured to form both low beam and high beam light distribution patterns.

[0027] The light source unit 18 includes a projection lens 20, a lens holder 22, a first reflector 24, a first circuit board 26, a second reflector 28, a second circuit board 30, and a heat sink 32. The first circuit board 26 is mounted on a light source (light-emitting element such as an LED) with its light-emitting surface facing upward. The second circuit board 30 is mounted on a light source (light-emitting element such as an LED) with its light-emitting surface facing diagonally downward and rearward.

[0028] The first reflector 24 reflects light emitted upward from the light source mounted on the first circuit board 26 toward the front of the vehicle. The second reflector 28 reflects light emitted diagonally downward and rearward from the light source mounted on the second circuit board 30 toward the front of the vehicle. Each reflector functions as an optical element that deflects the light from the light source in the horizontal direction. The projection lens 20 is held in the lens holder 22 and is made of a transparent material such as resin or glass. The projection lens 20 projects the light reflected by the first reflector 24 toward the front of the vehicle as a low beam light distribution pattern, and projects the light reflected by the second reflector 28 toward the front of the vehicle as a high beam light distribution pattern. The lens holder 22 and the first reflector 24 may be separate parts or may be a single resin molded part.

[0029] Figure 2 is a perspective view of the heat sink according to this embodiment. Figure 3 is a bottom view of the heat sink according to this embodiment. Figure 4 is a side view of the heat sink according to this embodiment.

[0030] The heat sink 32 is a metal part manufactured by die-casting using an alloy including, for example, aluminum. The heat sink 32 includes a first mounting portion 34a extending in the longitudinal direction of the vehicle on which the first circuit board 26 is mounted, a second mounting portion 34b extending in the longitudinal direction of the vehicle on which the second circuit board 30 is mounted, a base portion 36 extending from the first mounting portion 34a and the second mounting portion 34b toward the rear of the vehicle and through which heat from the first mounting portion 34a and the second mounting portion 34b is transferred, a plurality of first fins 38a provided upward from the base portion 36, and a plurality of second fins 38b provided downward from the base portion 36. The heat from the first mounting portion 34a and the second mounting portion 34b is dissipated through the base portion 36 and the first fins 38a and the second fins 38b.

[0031] The first mounting portion 34a has two bosses 42a and 42b used to fasten (fix) the mounted first circuit board 26 and the first reflector 24 mounted on the first circuit board 26 to the first mounting portion 34a, and two pins 44a and 44b for positioning the first circuit board 26 and the first reflector 24 relative to the first mounting portion 34a. The two bosses 42a and 42b and the two pins 44a and 44b are formed facing upward, and the central axis Ax of each boss and each pin is formed to be in the direction Z normal to the main surface of the first mounting portion 34a.

[0032] The second mounting portion 34b extends diagonally downward toward the front of the vehicle from the rear end of the first mounting portion 34a. The second mounting portion 34b also has two bosses 46a and 46b used for fastening (fixing) the second circuit board 30 and the second reflector 28 to the heat sink 32, and a pin 48 for positioning the first circuit board 26 in the vehicle width direction relative to the second mounting portion 34b. The two bosses 46a and 46b and the pin 48 are formed facing downward, and the central axis Ax of each boss and pin is formed to be in the direction Z normal to the main surface of the first mounting portion 34a.

[0033] Therefore, the heat sink 32 according to this embodiment can be manufactured by a method having the following steps. Specifically, the manufacturing method according to this embodiment includes the steps of removing the first mold in the direction normal to the main surface of the first mounting portion 34a (direction of arrow Z1) and removing the second mold in the direction directly opposite to the direction in which the first mold was removed (direction of arrow Z2). As a result, a heat sink 32 having two non-parallel mounting portions (first mounting portion 34a and second mounting portion 34b) can be manufactured with a simple mold configuration without using a slide mold.

[0034] Furthermore, in the heat sink 32 according to this embodiment, the angle α formed by the main surface of the first mounting portion 34a and the main surface of the second mounting portion 34b is approximately 30°. In this way, even when the angle α formed by the two mounting surfaces is relatively large (10° or more), a heat sink with two non-parallel mounting portions can be manufactured without using the slide mold that is normally required.

[0035] Figure 5 is a cross-sectional view taken along line A-A of the heat sink shown in Figure 3. Figure 6 is a cross-sectional view taken along line B-B of the heat sink shown in Figure 3. Note that, for the sake of clarity, Figures 5 and 6 also show other components besides the heat sink 32.

[0036] As shown in Figures 5 and 6, the light source unit 18 includes a heat sink 32, a first circuit board 26 mounted on a first mounting section 34a on which a first light source with an upward-facing light-emitting surface is mounted, a second circuit board 30 mounted on a second mounting section 34b on which a second light source with a downward-facing light-emitting surface is mounted, a second reflector 28 mounted on the second circuit board 30 to reflect light emitted from the second light source forward, and screws 50 fastened to the boss 46a. The second circuit board 30 has an elongated hole 30a in the front-to-back direction through which the boss 46a passes, and the second reflector 28 has a clearance hole 28a through which the boss 46a passes. The screw 50 is fastened to the boss 46a, with the boss 46a inserted into the elongated hole 30a formed in the second circuit board 30 and the clearance hole 28a formed in the second reflector 28, thereby fixing the second circuit board 30 and the second reflector 28 to the second mounting portion 34b.

[0037] As a result, the boss 46a only needs to have the function (shape) of fastening the second circuit board 30 and the second reflector 28 to the heat sink 32, increasing the degree of freedom in the shape of the boss when manufacturing with a mold. In other words, there is no need to manufacture with a complex mold configuration such as a sliding structure, and there is no need to perform additional processing after manufacturing with a mold to make the boss protrude in the direction normal to the mounting surface.

[0038] Figure 7(a) is an enlarged view of area C in Figure 5, and Figure 7(b) is an enlarged view of area D in Figure 5. As shown in Figures 3 and 7(a), the second mounting portion 34b has a restricting portion 51 that restricts the position of the front edge portion 30b of the second circuit board 30 in the vehicle longitudinal direction. The restricting portion 51 may be, for example, an inclined wall that abuts against the front edge portion 30b. Also, as shown in Figures 3 and 7(b), the second mounting portion 34b has a restricting portion 52 that restricts the position of the rear edge portion 30c of the second circuit board 30 in the vehicle longitudinal direction. The restricting portion 52 may be, for example, a wall that abuts against the rear edge portion 30c. As a result, the boss 46a (boss 46b) does not need to be used for positioning, and the boss 46a (boss 46b) can be formed on the second mounting portion 34b such that its central axis Ax is not parallel to the normal direction X of the main surface S of the second mounting portion 34b.

[0039] Furthermore, as shown in Figure 3, the second mounting portion 34b has a positioning pin 48 formed facing downwards that restricts the position of the second circuit board 30 in the vehicle width direction Y. This allows the second circuit board 30 to be positioned in the vehicle width direction Y relative to the second mounting portion 34b without using a boss 46a (46b).

[0040] Thus, the second mounting portion 34b has restricting portions 51 and 52 that restrict the position of the edge of the second circuit board 30 in the vehicle's longitudinal direction, and a pin 48 that restricts the position of the second circuit board 30 in the vehicle's width direction Y. Therefore, the second circuit board 30 can be positioned at a predetermined location on the second mounting portion 34b without using bosses 46a and 46b.

[0041] Furthermore, the second circuit board 30 has a pair of round holes and elongated holes (not shown) for positioning with respect to the second reflector 28. The second reflector 28 has a pair of positioning pins (not shown) for positioning with respect to the second circuit board 30. The second reflector 28 is positioned relative to the second circuit board 30 by engaging the positioning pins with the aforementioned round holes and elongated holes of the second circuit board 30, respectively. This makes it possible to align the optical center of the light source placed on the second circuit board 30 with that of the second reflector 28.

[0042] (Modified Example) In the above heat sink 32, the first mounting portion 34a is horizontal, and the second mounting portion 34b is arranged to extend obliquely downward from the rear end of the first mounting portion 34a toward the front of the vehicle. However, the present invention is not limited to this configuration, and various combinations in which the inclinations of the first mounting portion and the second mounting portion are non-parallel to each other are possible. For example, a heat sink having the following configurations may be used. (1) A heat sink in which the second mounting portion is horizontal and the first mounting portion is arranged to extend obliquely upward from the rear end of the second mounting portion toward the front of the vehicle. (2) A heat sink in which the first mounting portion is horizontal and the second mounting portion is arranged to extend obliquely downward from the front end of the first mounting portion toward the rear of the vehicle. (3) A heat sink in which the second mounting portion is horizontal and the first mounting portion is arranged to extend obliquely upward from the front end of the second mounting portion toward the rear of the vehicle.

[0043] Even for a heat sink having two non-parallel mounting portions as in (1) to (3) above, it can be manufactured in a simple configuration type.

[0044] As described above, the present invention has been described with reference to the above embodiments. However, the present invention is not limited to the above embodiments or modified examples, and the present invention also includes those obtained by appropriately combining or replacing the configurations of the embodiments. Further, it is possible to appropriately rearrange the combinations and processing orders in the embodiments based on the knowledge of those skilled in the art, and to add various modifications such as various design changes to the embodiments. Embodiments with such modifications may also be included in the scope of the present invention.

[0045] This international application claims priority based on Japanese Patent Application No. 2024-192378, which was filed in Japan on October 31, 2024, and the entire contents of the Japanese Patent Application No. 2024-192378 are incorporated herein by reference.

[0046] The above description of specific embodiments of the present invention is presented for purposes of illustration. They are not intended to be exhaustive or to limit the invention to the exact forms described. Many modifications and variations will be apparent to those of ordinary skill in the art in light of the above description.

[0047] 10 Vehicle lighting fixture, 18 Light source unit, 24 First reflector, 26 First circuit board, 28 Second reflector, 30 Second circuit board, 30a Slotted hole, 30b Front edge, 30c Rear edge, 32 Heat sink, 34a First mounting part, 34b Second mounting part, 36 Base part, 42a Boss, 44a Pin, 46a Boss, 46b Boss, 48 ​​Pin, 50 Screw, 51 Regulating part, 52 Regulating part.

Claims

1. The device comprises: a first mounting section on which a first substrate on which a first light source having an upward-facing light-emitting surface is mounted is mounted; a second mounting section on which a second substrate on which a second light source having a downward-facing light-emitting surface is mounted is mounted; and a heat dissipation section for transferring and dissipating heat from the first mounting section and the second mounting section, wherein the first mounting section extends in the longitudinal direction of the vehicle and has a first fastening boss formed facing upward for use when fastening the mounted first substrate to the first mounting section; the second mounting section extends diagonally downward from the rear end of the first mounting section toward the front of the vehicle and has a second fastening boss formed facing downward for use when fastening the mounted second substrate to the second mounting section, wherein the first fastening boss is formed such that its central axis is in the direction normal to the main surface of the first mounting section. The heat sink is characterized in that the second fastening boss is formed such that its central axis is in the direction normal to the main surface of the first mounting portion.

2. The device comprises: a first mounting section on which a first substrate on which a first light source having an upward-facing light-emitting surface is mounted is mounted; a second mounting section on which a second substrate on which a second light source having a downward-facing light-emitting surface is mounted is mounted; and a heat dissipation section for transferring and dissipating heat from the first mounting section and the second mounting section, wherein the first mounting section extends in the longitudinal direction of the vehicle and has a first fastening boss formed facing upward for use when fastening the mounted first substrate to the first mounting section; the second mounting section extends diagonally from the rear end of the first mounting section toward the front of the vehicle and has a second fastening boss formed facing downward for use when fastening the mounted second substrate to the second mounting section, wherein the second fastening boss is formed such that its central axis is in the direction normal to the main surface of the second mounting section. The heat sink is characterized in that the first fastening boss is formed such that its central axis is in the direction normal to the main surface of the second mounting portion.

3. The device comprises: a first mounting section on which a first substrate on which a first light source having an upward-facing light-emitting surface is mounted is mounted; a second mounting section on which a second substrate on which a second light source having a downward-facing light-emitting surface is mounted is mounted; and a heat dissipation section for transferring and dissipating heat from the first mounting section and the second mounting section, wherein the first mounting section extends in the longitudinal direction of the vehicle and has a first fastening boss formed facing upward for use when fastening the mounted first substrate to the first mounting section; the second mounting section extends diagonally downward from the front end of the first mounting section toward the rear of the vehicle and has a second fastening boss formed facing downward for use when fastening the mounted second substrate to the second mounting section, wherein the first fastening boss is formed such that its central axis is in the direction normal to the main surface of the first mounting section. The heat sink is characterized in that the second fastening boss is formed such that its central axis is in the direction normal to the main surface of the first mounting portion.

4. The device comprises: a first mounting section on which a first substrate on which a first light source having an upward-facing light-emitting surface is mounted is mounted; a second mounting section on which a second substrate on which a second light source having a downward-facing light-emitting surface is mounted is mounted; and a heat dissipation section for transferring and dissipating heat from the first mounting section and the second mounting section, wherein the first mounting section extends in the longitudinal direction of the vehicle and has a first fastening boss formed facing upward for use when fastening the mounted first substrate to the first mounting section; the second mounting section extends diagonally from the front end of the first mounting section toward the rear of the vehicle and has a second fastening boss formed facing downward for use when fastening the mounted second substrate to the second mounting section, wherein the second fastening boss is formed such that its central axis is in the direction normal to the main surface of the second mounting section. The heat sink is characterized in that the first fastening boss is formed such that its central axis is in the direction normal to the main surface of the second mounting portion.

5. The heat sink according to any one of claims 1 to 4, characterized in that the angle formed by the main surface of the first mounting portion and the main surface of the second mounting portion is 10° or more.

6. The heat sink according to claim 1 or 3, characterized in that the second mounting portion has a restricting portion that restricts the position of the edge of the second substrate in the vehicle longitudinal direction.

7. The heat sink according to claim 6, characterized in that the second mounting portion has positioning pins that restrict the position of the second substrate in the vehicle width direction formed facing downward.

8. A light source unit comprising: a heat sink according to claim 1; a first substrate mounted on the first mounting portion and on which a first light source having an upward-facing light-emitting surface is mounted; a second substrate mounted on the second mounting portion and on which a second light source having a downward-facing light-emitting surface is mounted; a reflector mounted on the second substrate and reflecting light emitted from the second light source forward; and a screw fastened to the second fastening boss, wherein the second substrate has an elongated hole through which the second fastening boss passes; the reflector has a hole through which the second fastening boss passes; and the screw is fastened to the second fastening boss with the second fastening boss inserted into the elongated hole formed in the second substrate and the hole formed in the reflector, thereby fixing the second substrate and the reflector to the second mounting portion.

9. The light source unit according to claim 8, characterized in that the second mounting portion comprises a restricting portion for restricting the position of the edge of the second substrate in the vehicle longitudinal direction, and a positioning pin for restricting the position of the second substrate in the vehicle width direction.

10. A method for manufacturing a heat sink according to any one of claims 1 to 4, comprising: a step of removing a first mold in the direction normal to the main surface of the first mounting portion or the second mounting portion; and a step of removing a second mold in the direction directly opposite to the direction in which the first mold was removed.

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