CN114440190A

CN114440190A - Light source unit

Info

Publication number: CN114440190A
Application number: CN202111209209.5A
Authority: CN
Inventors: 金森昭贵
Original assignee: Koito Manufacturing Co Ltd
Current assignee: Koito Manufacturing Co Ltd
Priority date: 2020-11-05
Filing date: 2021-10-18
Publication date: 2022-05-06
Anticipated expiration: 2041-10-18
Also published as: JP2022074954A; CN114440190B

Abstract

The invention relates to a light source unit, which reduces the cost of the light source unit with a substrate provided with a light-emitting element supported by a heat sink. The heat sink (60) is configured as an extrusion molding and is provided with a first engaging piece (66) and a second engaging piece (68) protruding from two positions in the left-right direction of a substrate mounting surface (62a) for mounting the substrate (50). At this time, the first engaging piece is configured to position the substrate in the left-right direction by engaging with the first end surface (50a) of the substrate, and the second engaging piece is configured to elastically press the substrate toward the first engaging piece by engaging with the second end surface (50b) of the substrate. In addition, first recessed portions (62b) extending in the front-rear direction of the lamp are formed in the substrate mounting surface at positions adjacent to the left and right sides of the second engaging piece. This allows the second engaging piece to be easily bent, and the substrate can be supported without performing post-processing such as forming a screw hole in the heat sink.

Description

Light source unit

Technical Field

The present invention relates to a light source unit in which a substrate on which a light emitting element is mounted is supported by a heat sink.

Background

Conventionally, as a light source unit of a vehicle lamp or the like, a structure in which a substrate on which a light emitting element is mounted is supported by a heat sink for heat dissipation is known.

As a configuration of such a light source unit, patent document 1 describes a configuration in which a substrate on which a light emitting element is mounted is supported by a heat sink via a power supply attachment.

In the light source unit described in "patent document 1", the power supply accessory is fixed to the heat sink by screw fastening.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-139514

Disclosure of Invention

Problems to be solved by the invention

As the structure of the light source unit, if a structure in which the substrate on which the light emitting element is mounted is directly supported by the heat sink is adopted, the structure of the light source unit can be simplified.

However, even with such a configuration, in the case of a configuration in which the substrate is screwed to the heat sink, it is necessary to form screw holes in the heat sink in advance. Therefore, it is necessary to manufacture the heat sink as a die-cast product or to form screw holes in a metal product after extrusion molding by post-processing, and therefore it is difficult to reduce the cost of the light source unit.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a light source unit in which a substrate on which a light emitting element is mounted is supported by a heat sink, and which can reduce the cost thereof.

Means for solving the problems

The invention of the present application achieves the above object by studying the structure of the heat sink.

That is, the light source unit according to the present invention is constituted such that,

a light source unit including a substrate on which a light emitting element is mounted and a heat sink supporting the substrate,

the heat sink is formed as a metal extrusion molding,

the radiator includes: a substrate mounting surface on which the substrate is mounted; and a first engaging piece and a second engaging piece formed so as to protrude from two portions in a first direction of the substrate mounting surface,

the first engaging piece is configured to engage with a first end surface of the substrate to position the substrate in the first direction,

the second engaging piece is configured to be engaged with the second end surface of the substrate to elastically press the substrate toward the first engaging piece,

first groove portions extending in a second direction orthogonal to the first direction are formed in the substrate mounting surface at positions adjacent to both sides of the second engaging piece in the first direction.

The "heat sink" may be formed as a metal extrusion, and the specific material, shape, and the like thereof are not particularly limited.

The "first engaging piece" is not particularly limited in specific shape as long as it is configured to be able to position the substrate in the first direction by engaging with the first end surface of the substrate.

The "second engaging piece" is not particularly limited in specific shape as long as it can elastically press the substrate toward the first engaging piece by engaging with the second end surface of the substrate.

Effects of the invention

In the light source unit according to the present invention, the substrate on which the light emitting element is mounted is supported by the heat sink which is an extruded metal member, but the heat sink includes a substrate mounting surface on which the substrate is mounted, and a first engaging piece and a second engaging piece which are formed so as to protrude from two portions in the first direction of the substrate mounting surface, and in addition, the first engaging piece is configured to position the substrate in the first direction by engaging with the first end surface of the substrate, and the second engaging piece is configured to elastically press the substrate toward the first engaging piece by engaging with the second end surface of the substrate, and therefore, the substrate can be supported by the heat sink without using a screw fastening or the like.

In this case, since the first recessed portions extending in the second direction orthogonal to the first direction are formed in the positions adjacent to both sides of the second engaging piece in the first direction on the substrate mounting surface of the heat sink, the second engaging piece can be easily bent even though the heat sink is made of metal. In this way, the second engaging piece can be configured to elastically press the substrate toward the first engaging piece by engaging with the second end surface of the substrate.

Therefore, the substrate can be supported with respect to the heat sink without performing post-processing such as formation of screw holes on the heat sink formed as a metal extrusion molding, and thus the cost of the light source unit can be reduced.

As described above, according to the invention of the present application, in the light source unit in which the substrate on which the light emitting element is mounted is supported by the heat sink, the cost can be reduced.

In addition, in the invention of the present application, since the heat sink is formed as an extruded metal product, a plurality of heat radiating fins can be formed, and thus the heat radiating effect can be improved as compared with a case where the heat sink is formed of a metal plate or the like.

In the above configuration, further, the first engaging piece is configured to abut against the corner portion of the first end surface to maintain a state in which the substrate is positioned in the third direction orthogonal to the first direction and the second direction, and the second engaging piece is configured to abut against the corner portion of the second end surface to maintain a state in which the substrate is positioned in the third direction.

In this case, the substrate can be reliably positioned in the first direction and the third direction only if the configuration of the tip portion of the first engaging piece is such that the surface on the second engaging piece side includes a first inclined surface extending in a direction inclined toward the second engaging piece side and a second inclined surface extending from the tip end position of the first inclined surface in a direction inclined toward the opposite side to the second engaging piece, and in addition, the configuration is such that the first inclined surface abuts against the corner portion of the first end surface, and the configuration of the second engaging piece is such that the surface on the first engaging piece side is formed of a concave curved surface formed so as to curve and extend toward the first engaging piece side.

In this case, if the angle between the first inclined surface and the substrate mounting surface is set to 45 ° or more, the following operational effects can be obtained.

That is, the first engaging piece is configured to position the substrate in the first direction by engaging with the first end surface of the substrate, but by setting the angle between the first inclined surface and the substrate mounting surface to a value of 45 ° or more, even if there is some variation in the thickness of the substrate, it is possible to suppress the variation in the first direction in the abutting position between the first engaging piece and the corner portion of the first end surface of the substrate. This can improve the positioning accuracy of the substrate in the first direction.

In the above configuration, if the first opening portion and the second opening portion are formed at two locations in the first direction of the substrate, the first end face is formed by the end face on the second opening portion side on the inner peripheral face of the first opening portion, and the second end face is formed by the end face on the first opening portion side on the inner peripheral face of the second opening portion, then the substrate can be reliably positioned in the second direction by abutting against the end face in the second direction on the inner peripheral face of the first opening portion as the first engaging piece.

In this case, if the substrate is configured such that the slits extending parallel to the second end face are formed in the vicinity of the second end face, the beam portion extending in the second direction is formed in the portion located between the second opening portion and the slits.

That is, when the second engaging piece engages with the second end surface of the substrate and a force acts to elastically press the substrate toward the first engaging piece, the substrate may be deflected depending on the degree of the elastic pressing force, but the beam portion formed in the vicinity of the second end surface is deflected and deformed to absorb the elastic pressing force, thereby preventing the entire substrate from being deflected.

In the above configuration, if the second groove portion extending in the second direction is formed at least at one portion of the substrate mounting surface and the tapping screw is fastened to each of the second groove portions via each of the screw insertion holes in addition to the configuration in which the screw insertion hole is formed at least one portion of the substrate, it is not necessary to perform post-processing on the heat sink formed as a metal extruded product, and the substrate can be more reliably fixed to the heat sink.

Alternatively, in the above configuration, further, in addition to the configuration in which the pair of protruding portions protruding in the opposite directions to each other in the first direction are formed at the end portion in the second direction of the substrate, the substrate can be reliably positioned in the second direction even when a configuration is adopted in which the substrate is positioned in the second direction by contact with the second-direction end surfaces of the first engaging piece and the second engaging piece as the configuration of the pair of protruding portions.

In this case, if the pair of engaging portions that engage with the end surfaces of the first engaging piece and the second engaging piece on the opposite side in the second direction when the pair of protruding portions come into contact with the end surfaces of the first engaging piece and the second engaging piece in the second direction are formed at the end portions of the substrate on the opposite side in the second direction, the state in which the substrate is positioned in the second direction can be reliably maintained.

Drawings

Fig. 1 is a side sectional view showing a vehicle lamp including a light source unit according to a first embodiment of the present invention.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is a view in the direction III of fig. 2.

Fig. 4 is a sectional view taken along line IV-IV of fig. 2.

Fig. 5 is a detailed view of a main portion of fig. 2.

Fig. 6 is an exploded perspective view of the light source unit.

Fig. 7 is a view substantially similar to fig. 5 showing the assembly of the light source unit.

Fig. 8 is a view similar to fig. 5 showing a first modification of the first embodiment.

Fig. 9 is a view substantially similar to fig. 5 showing a second modification of the first embodiment.

Fig. 10 is a side sectional view showing a vehicle lamp including a light source unit according to a second embodiment of the invention of the present application.

Fig. 11 is a view taken along line XI-XI of fig. 10.

Fig. 12 is a view similar to fig. 11 showing the assembly of the light source unit according to the second embodiment.

Description of the reference numerals

10: a vehicular lamp;

12: a lamp body;

14: a light-transmitting cover;

20: a lamp unit;

30. 130, 230: a light source unit;

40: a light emitting element;

40 a: a light emitting face;

42: a conductive layer;

44: a connector;

50: a substrate;

50 a: a first end face;

50a1, 50b 1: a corner portion;

50 b: a second end face;

50c1, 50c2, 50d, 72c1, 72c2, 72 d: inserting a screw into the through hole;

52A: a first opening portion;

52 Aa: a rear end face;

52B: a second opening portion;

52C: a slit;

54: a beam section;

60. 160, 260: a heat sink;

62. 162, 262: a base portion;

62a1, 62a, 262 a: a substrate mounting surface;

62A2, 62B: a bottom region;

62Aa2, 62 Ba: a lower displacement surface;

62 b: a first groove portion;

62c, 62 d: a second groove portion;

64. 164, 264: a heat dissipating fin;

66. 166, 266: a first engaging piece;

66a1, 68 Aa: a tip portion;

66a1, 168Aa 1: a first inclined surface;

66a2, 168Aa 2: a second inclined surface;

66 b: a rear end face (end face in the second direction);

68. 168, 268: a second engaging piece;

68A, 168A, 266A: a main body portion;

68 Aa: an inner surface (a surface on the first engaging piece side);

68 Ab: an outer surface;

68B, 168B, 266B: a lower extension;

70: a reflector;

70 a: a reflective surface;

70 b: a cut-out portion;

70 s: a reflective element;

72: a horizontal flange portion;

74: a self-tapping screw;

74 a: a threaded portion;

262 c: a third groove portion;

266 a: an upper end portion;

510: a vehicular lamp;

512: a lamp body;

514: a light-transmitting cover;

520 a lamp unit;

530: a light source unit;

540: a light emitting element;

540 a: a light emitting face;

542: a conductive layer;

544: a connector;

550: a substrate;

550 a: a first end face;

550 b: a second end face;

550 e: a protruding portion;

550 f: a fastening part;

550g1, 550g2, 550g 3: inserting a screw into the through hole;

560: a heat sink;

562: a base portion;

562 a: a substrate mounting surface;

562 Aa: a rear displacement surface;

562 b: a first groove portion;

564: a heat dissipating fin;

566: a first engaging piece;

566e, 568 e: an upper end face (end face in the second direction);

566f, 568 f: a lower end face (end face on the opposite side in the second direction);

568: a second engaging piece;

568A: a main body portion;

568B: a rear extension;

580: a light transmission control member;

580A: an injection section;

580B: an injection section;

580 Bs: a diffusion lens element;

582: a support pin;

582 a: a tip portion;

g: lubricating grease;

θ: and (4) an included angle.

Detailed Description

Hereinafter, embodiments of the invention of the present application will be described with reference to the drawings.

First, a first embodiment of the invention of the present application will be described.

Fig. 1 is a side sectional view showing a vehicle lamp 10 including a light source unit 30 according to a first embodiment of the invention of the present application, and fig. 2 is a sectional view taken along line II-II of fig. 1. Fig. 3 is a view taken along direction III of fig. 2, and fig. 4 is a sectional view taken along line IV-IV of fig. 2.

In fig. 1 to 4, the direction indicated by X is "front of the lamp," the direction indicated by Y is "left" (right when the lamp is viewed from the front) orthogonal to "front of the lamp," and the direction indicated by Z is "upper. The same applies to the figures other than fig. 1 to 4.

As shown in fig. 1 to 4, a vehicle lamp 10 according to the present embodiment is a headlamp provided at a front end portion of a vehicle, and a lamp unit 20 is assembled in a lamp chamber formed by a lamp body 12 and a transparent light-transmitting cover 14 attached to a front end opening portion of the lamp body 12.

The lamp unit 20 is configured to include a light source unit 30 and a reflector 70.

The light source unit 30 includes a light emitting element 40, a substrate 50 on which the light emitting element 40 is mounted, and a heat sink 60 supporting the substrate 50.

The reflector 70 includes a reflection surface 70a on which a plurality of reflection elements 70s are formed, and forms a desired light distribution pattern by reflecting light emitted from the light emitting element 40 toward the front of the lamp in each reflection element 70 s.

The reflector 70 is supported by the base plate 50 at a horizontal flange portion 72 formed at a lower end portion thereof. This support structure will be described later.

Next, a specific configuration of the light source unit 30 will be described.

Fig. 5 is a detailed view of a main portion of fig. 2. Fig. 6 is an exploded perspective view of the light source unit 30.

As shown in fig. 5 and 6, the light emitting element 40 is a white light emitting diode having a horizontally long rectangular light emitting surface 40a, and is disposed in a state where the light emitting surface 40a faces upward.

The substrate 50 is made of an insulating member extending in a flat plate shape along a horizontal plane, and has an outer shape of a substantially horizontally long rectangular shape.

A pair of left and right conductive layers 42 extending in the front-rear direction of the lamp from a position slightly on the front side of the lamp from the center position in the front-rear direction of the lamp to a position near the rear end thereof are formed at the center position in the left-right direction of the upper surface of the substrate 50. The light emitting element 40 is placed on the front end portions of the pair of left and right conductive layers 42 so as to straddle the conductive layers 42, and is thereby electrically connected to the conductive layers 42.

Connectors 44 are mounted on rear end portions of the pair of left and right conductive layers 42 so as to straddle the conductive layers 42, thereby electrically connecting the conductive layers 42. Then, a power source side connector (not shown) is attached to the connector 44, and thereby power is supplied to the light emitting element 40.

The heat sink 60 is a metal (for example, aluminum) member, and is configured as an extrusion molded article. The heat sink 60 of the present embodiment is formed to extend in the front-rear direction of the lamp while maintaining a cross-sectional shape along a vertical plane orthogonal to the front-rear direction of the lamp at a constant shape.

The heat sink 60 is configured to include a base portion 62 extending in a flat plate shape along a horizontal plane and a plurality of heat radiating fins 64 extending vertically downward from the base portion 62.

The base portion 62 has an outer shape of a horizontally long rectangular shape in a plan view, and an upper surface thereof is configured as a substrate mounting surface 62a on which the substrate 50 is mounted.

The base portion 62 is formed with a first engaging piece 66 and a second engaging piece 68 that protrude upward from two portions in the left-right direction of the substrate mounting surface 62 a.

The first engaging piece 66 and the second engaging piece 68 are arranged in a positional relationship approximately bilaterally symmetrical with respect to the center position in the lateral direction of the heat sink 60. The first engaging piece 66 and the second engaging piece 68 are formed such that the upper end position of the first engaging piece 66 is slightly above the upper end position of the second engaging piece 68.

The first engaging piece 66 on the left side is connected to the substrate mounting surface 62a at its base end portion, while the second engaging piece 68 on the right side is formed such that its base end portion extends to a lower displacement surface 62Aa displaced downward from the substrate mounting surface 62 a. That is, the second engaging piece 68 is constituted by a main body portion 68A located above the substrate mounting surface 62a and a lower extension portion 68B located below the substrate mounting surface 62 a.

To achieve this, the heat sink 60 is formed with first recessed portions 62B extending in the front-rear direction of the lamp at positions adjacent to both the left and right sides of the lower extension portion 68B of the second engaging piece 68.

Thus, the base portion 62 is formed such that the peripheral region of the second engagement piece 68 extends in a substantially U-shape around the lower extension portion 68B of the second engagement piece 68, and the lower displacement surface 62Aa is formed by the upper surface of the bottom region 62A. The lower direction shift surface 62Aa is located below the lower surface of the base portion 62 and below the center between the substrate mounting surface 62a and the lower end surface of the heat radiating fin 64.

The plurality of heat radiation fins 64 are formed to extend in the front-rear direction of the lamp at equal intervals in the left-right direction. The thickness of each fin 64 is set to a value equal to or less than half the thickness of the base portion 62. Among the plurality of heat radiating fins 64, the heat radiating fin 64 extending from the bottom region 62A of the base portion 62 is formed shorter than the other heat radiating fins 64.

The first engaging piece 66 is configured to engage with the first end surface 50a of the substrate 50 to position the substrate 50 in the left-right direction. On the other hand, the second engaging piece 68 is configured to engage with the second end surface 50b of the board 50 to elastically press the board 50 toward the first engaging piece 66.

At this time, the first engaging piece 66 is configured to be in contact with the corner portion 50a1 on the upper end side of the first end surface 50a, thereby maintaining the state in which the substrate 50 is positioned in the vertical direction. The second engaging piece 68 is configured to contact the corner portion 50b1 on the upper end side of the second end surface 50b, thereby maintaining the state in which the substrate 50 is positioned in the vertical direction.

The first engaging piece 66 is formed to extend vertically upward with a thickness slightly greater than the thickness of the heat dissipating fin 64 (i.e., a thickness of about half the base portion 62), but the tip portion 66a thereof is formed to bulge toward the second engaging piece 68.

Specifically, the distal end portion 66a of the first engaging piece 66 includes, as the surface on the second engaging piece 68 side, a first inclined surface 66a1 extending in a direction inclined toward the second engaging piece 68 side, and a second inclined surface 66a2 extending from the distal end position of the first inclined surface 66a1 in a direction inclined toward the opposite side from the second engaging piece 68. The first engaging piece 66 is configured to abut against the corner 50a1 of the first end surface 50a at the first inclined surface 66a1 of the tip end 66 a.

At this time, the tip portion 66a of the first engaging piece 66 is formed such that the angle θ between the first inclined surface 66a1 and the substrate mounting surface 62a is 45 ° or more (e.g., about 50 to 70 °).

On the other hand, the second engaging piece 68 is formed such that the lower extension portion 68B thereof extends in a flat plate shape vertically upward from the lower direction displacement surface 62Aa with a thickness slightly smaller than the thickness of the heat radiating fin 64, and the main body portion 68A thereof is formed to extend in a curved manner upward from the substrate mounting surface 62a toward the first engaging piece 66 side.

At this time, the thickness of the body portion 68A at the base end position is set to be slightly smaller than the thickness of the plate-shaped extension portion 68B, and is formed to be gradually thinner toward the tip end position thereof. Thus, the main body portion 68A is formed of a concave curved surface whose inner surface (i.e., the surface on the first engagement piece 66 side) 68Aa is formed so as to be bent and extended toward the first engagement piece 66 side, and also formed of a convex curved surface whose outer surface 68Ab is formed so as to be bent and extended toward the first engagement piece 66 side.

The substrate 50 has a first opening 52A and a second opening 52B formed at two positions in the left-right direction corresponding to the first engaging piece 66 and the second engaging piece 68.

Each of the first opening 52A and the second opening 52B has a rectangular opening shape elongated in the front-rear direction of the lamp.

The first opening 52A on the left side is formed to have a width larger than the projected width of the first engaging piece 66 in plan view, and the front-rear width (i.e., the width in the front-rear direction of the lamp) is slightly larger than the front-rear width of the heat sink 60.

On the other hand, the second opening 52B located on the right side is formed to have a width larger than the projected width of the second engaging piece 68 in plan view, and the front-rear width thereof is larger than the front-rear width of the first opening 52A. At this time, the second opening 52B is formed such that the front end surface thereof is positioned on the lamp front side with respect to the front end surface of the first opening 52A, and the rear end surface thereof is positioned on the lamp rear side with respect to the rear end surface 52Aa of the first opening 52A.

The first end surface 50a of the substrate 50 is formed by an end surface on the right side (i.e., on the second opening 52B side) of the inner peripheral surface of the first opening 52A. The second end surface 50B of the substrate 50 is formed by the left end surface (i.e., the first opening 52A side) of the inner peripheral surface of the second opening 52B.

In a state where the first engaging piece 66 is inserted through the first opening 52A and the second engaging piece 68 is inserted through the second opening 52B, the first engaging piece 66 engages with the first end surface 50a of the board 50 and the second engaging piece 68 engages with the second end surface 50B of the board 50 by placing the board 50 on the board placement surface 62A of the base portion 62 of the heat sink 60.

At this time, the rear end surface 52Aa of the first opening 52A of the substrate 50 abuts against the rear end surface 66b of the first engaging piece 66 of the heat sink 60, thereby positioning the lamp in the front-rear direction.

A slit 52C extending parallel to the second end surface 50B is formed in the substrate 50 at a position closer to the first opening 52A side than the second opening 52B.

The slit 52C is formed to extend in the front-rear direction of the lamp with a lateral width slightly larger than the thickness of the lower extension portion 68B of the second engaging piece 68, and the front-rear width thereof is set to be substantially the same as the front-rear width of the second opening 52B. Thereby, beam portion 54 extending in the front-rear direction of the lamp is formed between slit 52C and second opening 52B. The lateral width of the beam portion 54 is set to be substantially the same as the thickness of the lower extension portion 68B of the second engaging piece 68.

As shown in fig. 6, a pair of left and right second recessed

portions

62c, 62d extending in the front-rear direction of the lamp are formed in the substrate placement surface 62a of the base portion 62 at positions further apart to the left and right sides from the pair of left and right first engaging pieces 66 and second engaging pieces 68.

On the board 50, screw insertion holes 50c1, 50c2 are formed at two locations in front and rear so as to be located directly above the left second groove portion 62c, and a screw insertion hole 50d is formed at one location so as to be located directly above the right second groove portion 62d and substantially on the front side surface of the screw insertion hole 50c 1.

As shown in fig. 2 to 4, screw insertion holes 72c1, 72c2 and screw insertion holes 72d are formed in the horizontal flange portion 72 of the reflector 70 at positions corresponding to the screw insertion holes 50c1, 50c2 and the screw insertion hole 50d of the substrate 50.

At this time, the screw insertion holes 50c1 and 72c1 are formed in a circular cross-sectional shape, the screw insertion holes 50c2 and 72c2 are formed in an oblong cross-sectional shape elongated in the front-rear direction of the lamp, and the

screw insertion holes

50d and 72d are formed in an oblong cross-sectional shape elongated in the left-right direction.

In a state where the horizontal flange portion 72 is placed on the upper surface of the substrate 50, the reflector 70 is fixed to the substrate 50 by fastening the tapping screws 74 to the second groove portion 62c of the heat sink 60 via the screw insertion holes 72c1 and 72c2 and the screw insertion holes 50c1 and 50c2 of the substrate 50, respectively, and by fastening the tapping screws 74 to the second groove portion 62d of the heat sink 60 via the screw insertion holes 72d and the screw insertion holes 50d of the substrate 50.

The outer diameter dimension of the screw portion 74a of the tapping screw 74 is set to a value slightly larger than the lateral width of the

second groove portions

62c, 62d, and thereby reliably engages with the

second groove portions

62c, 62d in a fastened state in which both lateral side surfaces of the

second groove portions

62c, 62d are cut off.

The reflector 70 is formed with a pair of left and right notches 70b, and these notches 70b are used to prevent interference with the first engaging piece 66 and the second engaging piece 68 when the horizontal flange portion 72 of the reflector 70 is placed on the substrate 50.

Fig. 7 is a view substantially similar to fig. 5 showing the assembly of the light source unit 30.

Fig. 7 (a) is a diagram showing a first assembly method, and fig. 7 (b) is a diagram showing a second assembly method.

The first assembling method shown in fig. 7 (a) will be explained below.

First, as shown by the two-dot chain line in the figure, the substrate 50 is lowered from the direction directly below the heat sink 60 while being kept horizontal, and the corner portion on the lower end side of the first end face 50a is brought into contact with the vicinity of the upper end of the second inclined surface 66a2 of the first engaging piece 66. At this time, the substrate 50 is positioned above the second engaging piece 68, and the second end surface 50b thereof is positioned to the left of the distal end portion of the body portion 68A of the second engaging piece 68.

In this state, when the substrate 50 is lowered while being kept horizontal, the corner portion on the lower end side of the first end face 50a moves diagonally downward to the right along the second inclined surface 66a2 of the first engaging piece 66, and therefore the second end face 50b thereof comes into contact with the distal end portion of the body portion 68A of the second engaging piece 68, resulting in the state shown by the solid line in the drawing.

Thereafter, when the corner portion on the lower end side of the first end surface 50a is moved along the second inclined surface 66a2 of the first engaging piece 66 while the board 50 is further kept horizontal, the second engaging piece 68 is pressed rightward by the second end surface 50B, and the main body portion 68A of the second engaging piece 68 is bent rightward together with the downward extending portion 68B. At this time, the substrate 50 receives a pressing force in the left direction as a reaction force from the second engaging piece 68.

Further, when the first end surface 50a of the substrate 50 is moved to the lower end position of the second inclined surface 66a2 of the first engaging piece 66 while the substrate 50 is kept horizontal, the substrate 50 and the second inclined surface 66a2 are released from contact with each other, and therefore, as shown by the two-dot chain line in the figure, the substrate 50 is lowered to a position of surface contact with the substrate placement surface 62a of the heat sink 60. During this time, the substrate 50 is in a state in which the corner portion on the upper end side of the second end surface 50b is in contact with the inner surface 68Aa of the body portion 68A of the second engaging piece 68, but is continuously pressed leftward by the second engaging piece 68.

Therefore, as shown in fig. 5, the substrate 50 is positioned in a state where the upper end side corner portion 50a1 of the first end surface 50a abuts against the first engaging piece 66, and the upper end side corner portion 50b1 of the second end surface 50b is maintained in a state where it is pressed leftward by the second engaging piece 68.

The second assembling method shown in fig. 7 (b) will be explained below.

First, as shown by the two-dot chain line in the figure, the lower surface of the substrate 50 is brought into contact with the upper end surface of the first engaging piece 66 in the right vicinity of the first end surface 50a thereof and the corner portion on the lower end side of the right end surface of the second opening portion 52B is brought into contact with the upper end vicinity portion of the outer surface 68Ab of the body portion 68A of the second engaging piece 68 by lowering the substrate 50 from the state of being horizontally arranged obliquely upward to the left of the heat sink 60 toward the right downward direction.

In this state, when the substrate 50 is shifted rightward, the corner portion on the lower end side of the first end face 50a moves obliquely downward rightward along the second inclined surface 66a2 of the first engaging piece 66, and the corner portion on the lower end side of the right end face of the second opening portion 52B moves obliquely downward rightward along the outer surface 68Ab of the main body portion 68A of the second engaging piece 68, and the corner portion on the lower end side of the right end face of the substrate 50 abuts against the substrate mounting surface 62a of the heat sink 60 halfway therebetween, and the state shown by the solid line in the drawing is obtained.

At this time, the substrate 50 is in a state in which the body portion 68A of the second engaging piece 68 is inserted into the second opening portion 52B, and a corner portion on the upper end side of the second end surface 50B is in a state in which it abuts against a portion near the upper end of the inner surface 68Aa of the body portion 68A of the second engaging piece 68.

Thereafter, when the board 50 is further displaced rightward, the second engaging piece 68 is pressed rightward by the corner portion on the upper end side of the second end surface 50B, and the main body portion 68A of the second engaging piece 68 is in a state of being deflected rightward together with the lower extending portion 68B. At this time, the substrate 50 receives a pressing force to the left as a reaction force from the second engaging piece 68.

When the substrate 50 is further displaced rightward against the pressing force and the first end surface 50a of the substrate 50 is moved to the lower end position of the second inclined surface 66a2 of the first engaging piece 66, the substrate 50 and the second inclined surface 66a2 are released from contact with each other, and therefore, as shown by the two-dot chain line in the figure, the substrate 50 is lowered to a position in surface contact with the substrate mounting surface 62a of the heat sink 60. During this time, the substrate 50 in a state where the corner portion on the upper end side of the second end surface 50b is in contact with the second engagement piece 68 continues to receive the pressing force from the second engagement piece 68 to the left.

Next, the operation and effects of the present embodiment will be described.

The light source unit 30 according to the present embodiment is configured such that the substrate 50 on which the light emitting element 40 is mounted is supported by a heat sink 60 formed as an extruded metal member, and the heat sink 60 includes: a substrate mounting surface 62a on which the substrate 50 is mounted; and a first engaging piece 66 and a second engaging piece 68 formed so as to protrude from two portions in the left-right direction (two portions in the first direction) of the substrate placement surface 62a, in addition to which the first engaging piece 66 is configured to position the substrate 50 in the left-right direction by engaging with the first end surface 50a of the substrate 50, and the second engaging piece 68 is configured to elastically press the substrate 50 toward the first engaging piece 66 by engaging with the second end surface 50b of the substrate 50, so that the substrate 50 can be supported by the heat sink 60 without using screws or the like.

At this time, since the heat sink 60 is provided with the first recessed portions 62b extending in the front-rear direction of the lamp (the second direction orthogonal to the first direction) at positions adjacent to both the left and right sides of the second engaging piece 68 on the substrate mounting surface 62a, the second engaging piece 68 can be easily bent even if the heat sink 60 is made of metal. In addition, as a result, the second engaging piece 68 can be configured to elastically press the substrate 50 toward the first engaging piece 66 by engagement with the second end surface 50b of the substrate 50.

Therefore, the substrate 50 can be supported with respect to the heat sink 60 without performing post-processing such as forming screw holes on the heat sink 60 formed as a metal extrusion molding, and thus the cost of the light source unit 30 can be reduced.

As described above, according to the present embodiment, the cost of the light source unit 30 in which the substrate 50 on which the light emitting element 40 is mounted is supported by the heat sink 60 can be reduced.

In addition, in the present embodiment, the heat sink 60 is configured as an extruded metal product and includes the plurality of heat dissipating fins 64, and therefore, the heat dissipating effect can be improved as compared with the case where the heat sink 60 is configured by a metal plate or the like.

In the present embodiment, the first engaging piece 66 is configured to contact the corner portion 50a1 of the first end surface 50a, thereby maintaining the state in which the substrate 50 is positioned in the vertical direction (the third direction orthogonal to the first direction and the second direction), and the second engaging piece 68 is configured to contact the corner portion 50b1 of the second end surface 50b, thereby maintaining the state in which the substrate 50 is positioned in the vertical direction, so that the substrate 50 can be more reliably supported with respect to the heat sink 60.

At this time, the surface of the tip portion 66a of the first engaging piece 66 on the side of the second engaging piece 68 is provided with a first inclined surface 66a1 extending in a direction inclined toward the second engaging piece 68 and a second inclined surface 66a2 extending from the tip end position of the first inclined surface 66a1 in a direction inclined toward the opposite side to the second engaging piece 68, and is configured to abut against the corner portion 50a1 of the first end surface 50a at the first inclined surface 66a1, and the surface of the second engaging piece 68 on the side of the first engaging piece 66 is configured to be a concave curved surface formed so as to curve toward the side of the first engaging piece 66, so that the substrate 50 can be positioned more reliably in the left-right direction and the up-down direction.

At this time, since the angle between the first inclined surface 66a1 and the substrate mounting surface 62a is set to a value of 45 ° or more, the following operational effects can be obtained.

That is, the first engaging piece 66 is configured to position the substrate 50 in the left-right direction by engaging with the first end surface 50a of the substrate 50, but by setting the angle between the first inclined surface 66a1 and the substrate mounting surface 62a to a value of 45 ° or more, even if there is some variation in the thickness of the substrate 50, it is possible to suppress the variation in the left-right direction in the contact position between the first engaging piece 66 and the corner portion 50a1 of the first end surface 50a of the substrate 50. This can improve the accuracy of positioning the substrate 50 in the left-right direction.

Further, in the present embodiment, the first opening portion 52A and the second opening portion 52B are formed at two locations in the left-right direction of the substrate 50, the first end face 50a is formed by the end face on the second opening portion 52B side of the inner peripheral face of the first opening portion 52A, and the second end face 50B is formed by the end face on the first opening portion 52A side of the inner peripheral face of the second opening portion 52B, and in addition, the first engaging piece 66 is configured to position the substrate 50 in the lamp front-rear direction by coming into contact with the rear end face 52Aa (the end face in the second direction) of the inner peripheral face of the first opening portion 52A, so that the substrate 50 can be reliably positioned in the lamp front-rear direction.

In the present embodiment, the slits 52C extending parallel to the second end face 50B are formed in the substrate 50 in the vicinity of the second end face 50B, and thus the beam portions 54 extending in the front-rear direction of the lamp are formed in the portions located between the second opening portions 52B and the slits 52C.

That is, when the second engaging piece 68 engages with the second end surface 50b of the substrate 50 and a force elastically pressing the substrate 50 toward the first engaging piece 66 acts, the substrate 50 may be deflected depending on the degree of the elastic pressing force, but the beam portion 54 formed in the vicinity of the second end surface 50b is deflected and deformed to absorb the elastic pressing force, thereby preventing the entire substrate 50 from being deflected.

Further, in the present embodiment, the

second groove portions

62c, 62d extending in the front-rear direction of the lamp are formed at two left and right portions of the substrate mounting surface 62a, and the screw insertion holes 50c1, 50c2, 50d are formed at three portions of the substrate 50, and in addition, the tapping screws 74 are fastened to the

second groove portions

62c, 62d via the screw insertion holes 50c1, 50c2, 50d, so that it is not necessary to perform post-processing on the heat sink 60 configured as a metal extrusion molding, and the substrate 50 can be fixed to the heat sink 60 more reliably.

In the present embodiment, since the reflector 70 is fixed to the heat sink 60 together with the substrate 50 by fastening the tapping screws 74 through the screw insertion holes 72c1, 72c2, and 72d formed in the horizontal flange portion 72 of the reflector 70, the above-described operational effects can be obtained while minimizing the number of components of the vehicle lamp 10.

In the first embodiment, the structure in which the substrate 50 and the reflector 70 are fastened together with the heat sink 60 has been described as the vehicle lamp 10, but the reflector 70 may be fixed to the heat sink 60 (or to the substrate 50) by screw fastening or the like in a state independent of screw fastening of the substrate 50 to the heat sink 60.

In the first embodiment, the substrate 50 is securely fixed to the heat sink 60 by fastening the tapping screws 74 to the

second groove portions

62c, 62d of the heat sink 60, but if the substrate 50 is elastically pressed toward the first engaging piece 66 by engaging the second engaging piece 68 with the second end surface 50b thereof, the substrate 50 can be maintained in a positioned state not only in the left-right direction but also in the front-rear direction and the up-down direction of the lamp with respect to the heat sink 60 only by the pressing force if the pressing force is set to a somewhat large value.

In the first embodiment, the light-emitting element 40 is disposed with the light-emitting surface 40a thereof facing upward and the reflector 70 is disposed on the upper side thereof as the configuration of the light source unit 30, but the light source unit 30 and the reflector 70 may be disposed in other configurations.

In the first embodiment, the description has been given of the case where the vehicle lamp 10 in which the light source unit 30 is incorporated is a headlamp, but the same operational effects can be obtained even in the case of other lamps (for example, a fog lamp, a tail lamp, and the like), and the light source unit 30 can be configured to be used for applications other than the vehicle lamp.

Next, a modified example of the first embodiment will be described.

First, a first modification of the first embodiment will be described.

Fig. 8 is a view substantially similar to fig. 5 showing the light source unit 130 according to the present modification.

As shown in fig. 8, the basic configuration of this modification is the same as that of the first embodiment, but the configuration of the heat sink 160 is partially different from that of the first embodiment.

That is, the heat sink 160 of the present modification is also a metal extrusion molding, includes the base portion 162 and the plurality of heat radiating fins 164, and has a configuration including the first engaging piece 166 and the second engaging piece 168 protruding upward from two portions in the left-right direction in the substrate mounting surface 162a of the base portion 162, but the configuration of the second engaging piece 168 is partially different from that of the first embodiment.

Specifically, the second engagement piece 168 of the present modification also includes a main body portion 168A and a lower extension portion 168B, and the configuration of the lower extension portion 168B is the same as that of the first embodiment, but the configuration of the main body portion 168A is different from that of the first embodiment.

That is, the main body portion 168A of the present modification extends vertically upward from the substrate mounting surface 162a with a constant lateral width, and the distal end portion 168Aa thereof is formed so as to bulge in a wedge shape toward the first engaging piece 166 side. At this time, the left-right width of the body section 168A is set to the same value as the left-right width of the base end position of the body section 68A in the first embodiment.

The distal end portion 168Aa of the main body portion 168A includes, as the surface on the first engagement piece 166 side, a first inclined surface 168Aa1 extending in a direction inclined toward the first engagement piece 166 side, and a second inclined surface 168Aa2 extending from the distal end position of the first inclined surface 168Aa1 in a direction inclined toward the opposite side of the first engagement piece 166. The second engagement piece 168 is configured to abut against a corner portion on the upper end side of the second end surface 50b of the substrate 50 at the first inclined surface 168Aa1 of the distal end portion 168A.

Thus, the second engaging piece 168 is configured to elastically press the substrate 50 toward the first engaging piece 166 in a state of being engaged with the second end surface 50b of the substrate 50.

Even in the case of adopting the configuration of the present modification, substantially the same operational effects as those in the case of the above-described embodiment can be obtained.

Next, a second modification of the first embodiment will be described.

Fig. 9 is a view substantially similar to fig. 5 showing the light source unit 230 according to the present modification.

As shown in fig. 9, the basic configuration of this modification is the same as that of the first embodiment, but the configuration of the heat sink 260 is partially different from that of the first embodiment.

That is, the heat sink 260 of the present modification is also a metal extrusion molding, and includes a base portion 262 and a plurality of heat radiating fins 264, and is configured to include first engaging pieces 266 and second engaging pieces 268 protruding upward from two portions in the left-right direction in the substrate placement surface 262a of the base portion 262, but the configuration of the first engaging pieces 266 is partially different from that of the first embodiment.

Specifically, the first engaging piece 266 of the present modification is configured by a main body portion 266A located above the substrate mounting surface 262a and a lower extension portion 266B located below the substrate mounting surface 262 a. The lower extension portion 268B is formed to extend vertically downward while maintaining the lateral width of the base end portion of the main body portion 266A (i.e., with a lateral width wider than the lower extension portion 268B of the second engagement piece 268).

To achieve this, third recessed portions 262c extending in the front-rear direction of the lamp are formed in the heat sink 260 at positions adjacent to both left and right sides of the lower extension portion 266B of the first engaging piece 266.

Thus, the base portion 262 is formed such that the peripheral region of the first engagement piece 266 extends in a substantially U-shape around the lower extension portion 266B of the first engagement piece 266, and the lower displacement surface 262Ba is constituted by the upper surface of the bottom region 262B. The lower direction shift surface 262Ba is located below the lower surface of the base 262 and below the center between the substrate mounting surface 262a and the lower end surface of the heat radiating fin 264.

The first engaging piece 266 is configured to engage with the first end surface 50a of the board 50 at the upper end portion 266Aa of the main body portion 266A, thereby positioning the board 50 in the left-right direction. On the other hand, the second engaging piece 268 is configured to elastically press the substrate 50 toward the first engaging piece 266 by engaging the main body portion 268A with the second end surface 50b of the substrate 50.

At this time, since the first engaging piece 266 of the present modification includes the lower extension portion 266B, the upper end portion 266Aa of the main body portion 266A thereof engages with the first end surface 50a of the substrate 50, thereby elastically pressing the substrate 50 toward the second engaging piece 268. However, since the lower extension portion 268B of the first engaging piece 266 is formed to have a width larger than the width of the lower extension portion 268B of the second engaging piece 268, the second engaging piece 268 is mainly deflected when the substrate 50 is assembled to the heat sink 260.

In addition, in the present modification, since the first engaging piece 266 includes the downward extending portion 266B, the work of assembling the substrate 50 to the heat sink 260 can be performed more easily than in the case of the above-described embodiment.

Next, a second embodiment of the invention of the present application will be described.

Fig. 10 is a side sectional view of a vehicle lamp 510 including a light source unit 530 according to a second embodiment of the present invention, and fig. 11 is a view taken along line XI-XI of fig. 10. Fig. 12 is a view similar to fig. 11 showing the assembly of the light source unit 530.

As shown in fig. 10 and 11, a vehicle lamp 510 according to the present embodiment is also a headlamp provided at the front end of a vehicle, and a lamp unit 520 is assembled in a lamp chamber formed by a lamp body 512 and a transparent light-transmitting cover 514 attached to a front end opening of the lamp body 512.

The lamp unit 520 includes a light source unit 530 and a light transmission control member 580.

The light source unit 530 includes a light emitting element 540, a substrate 550 on which the light emitting element 540 is mounted, and a heat sink 560 for supporting the substrate 550.

The light emitting element 540 is a white light emitting diode having a horizontally long rectangular light emitting surface 540a, and is disposed in a state where the light emitting surface 540a faces the front direction of the lamp.

The substrate 550 is formed of an insulating member extending in a flat plate shape along a vertical plane orthogonal to the front-rear direction of the lamp, and has a substantially square outer shape.

A pair of left and right conductive layers 542 extending in the up-down direction from the center position in the up-down direction to the position near the upper end thereof is formed at the center position in the left-right direction on the front surface of the substrate 550. The light emitting element 540 is disposed at the lower end of the pair of left and right conductive layers 542. Further, a connector 544 is disposed at an upper end portion of the pair of left and right conductive layers 542.

The heat sink 560 is a metal (e.g., aluminum) member, and is formed as an extrusion molded product so as to extend in the vertical direction while maintaining a horizontal cross-sectional shape thereof at a constant shape.

The heat sink 560 according to the present embodiment has a shape obtained by cutting off both left and right end portions of the heat sink 60 according to the first embodiment, but otherwise has the same configuration as the heat sink 60 according to the first embodiment.

That is, the heat sink 560 includes a base portion 562 extending in a flat plate shape along the vertical surface and a plurality of heat radiating fins 564 extending from the base portion 562 toward the rear of the lamp.

The base portion 562 has an outer shape of a horizontally long rectangular shape when the lamp is viewed from the front, and a front surface thereof is configured as a substrate mounting surface 562a on which the substrate 550 is mounted.

The base portion 562 is formed with a first engaging piece 566 and a second engaging piece 568 which protrude from two portions in the left-right direction of the substrate mounting surface 562a toward the front of the lamp.

The arrangement and structure of the first engaging piece 566 and the second engaging piece 568 are the same as those of the first engaging piece 66 and the second engaging piece 68 of the first embodiment.

That is, the first engaging piece 566 positioned on the left side (the right side when the lamp is viewed from the front) is connected to the substrate mounting surface 562a at the base end portion thereof, but the second engaging piece 568 positioned on the right side is formed such that the base end portion thereof extends to the rear displacement surface 562Aa displaced rearward of the lamp than the substrate mounting surface 562 a. The second engaging piece 568 is composed of a main body 568A positioned on the front side of the lamp with respect to the substrate mounting surface 562a, and a rear extension 568B positioned on the rear side of the lamp with respect to the substrate mounting surface 562 a.

The first engaging piece 566 is configured to engage with a first end surface 550a, which is a left end surface of the substrate 550, to position the substrate 550 in the left-right direction. On the other hand, the second engaging piece 568 is configured to elastically press the board 550 toward the first engaging piece 566 by engaging with the second end surface 550b, which is the right end surface of the board 550.

At this time, the first engaging piece 566 is configured to maintain a state in which the substrate 550 is positioned in the front-rear direction of the lamp by abutting against a corner portion on the front end side of the first end surface 550 a. The second engaging piece 568 is configured to contact a corner portion on the front end side of the second end surface 550b, thereby maintaining the state in which the substrate 550 is positioned in the front-rear direction of the lamp.

In the light source unit 530 according to the present embodiment, the substrate 550 is inserted between the first engaging piece 566 and the second engaging piece 568 from above the heat sink 560, and is supported by the heat sink 560.

A pair of protruding portions 550e protruding in both left and right directions are formed at the upper end portion of the base plate 550. The pair of left and right protruding portions 550e are configured to position the board 550 in the vertical direction by abutting against the

upper end surfaces

566e, 568e of the first engaging piece 566 and the second engaging piece 568.

In addition, at the lower end portion of the base plate 550, when the pair of left and right protruding portions 550e abut against the

upper end surfaces

566e, 568e of the first engaging piece 566 and the second engaging piece 568, the pair of left and right engaging portions 550f engaging with the lower end surfaces 566f, 568f of the first engaging piece 566 and the second engaging piece 568 are formed as lance-shaped engaging pieces.

As shown in fig. 12, when the board 550 is inserted between the first engaging piece 566 and the second engaging piece 568 from above with respect to the heat sink 560, the pair of left and right engaging portions 550f are bent in the direction of approaching each other by the tip portions thereof abutting against the inner side surfaces of the first engaging piece 566 and the second engaging piece 568, and then when the pair of left and right protruding portions 550e are lowered to the position of abutting against the

upper end surfaces

566e, 568e of the first engaging piece 566 and the second engaging piece 568, the tip portions of the pair of left and right engaging portions 550f engage with the lower end surfaces 566f, 568f of the first engaging piece 566 and the second engaging piece 568.

This can reliably maintain the state in which the substrate 550 is positioned in the vertical direction with respect to the heat sink 560.

Further, as shown in fig. 12, when the substrate 550 is inserted between the first engaging piece 566 and the second engaging piece 568 from the upper side, if the grease G is applied in advance to the substrate mounting surface 562a of the heat sink 560, the insertion of the substrate 550 can be smoothly performed. In this case, it is preferable to apply the grease G in a vertically long shape in the upper central region of the substrate mounting surface 562a, and to smoothly insert the substrate 550 while minimizing the amount of grease G applied.

As shown in fig. 10, the light transmission control member 580 is configured to control the transmission of light from the light emitting element 540 in a state of being disposed on the front side of the lamp with respect to the light source unit 530.

That is, the light transmission control member 580 forms a desired light distribution pattern by allowing light emitted from the light emitting element 540 to enter from the entrance portion 580A, guiding the light directly or totally reflected to the exit portion 580B as parallel light, and emitting the light as light diffused in the left-right direction toward the front of the lamp through the plurality of diffusion lens elements 580Bs formed in the exit portion 580B.

The light transmission control member 580 includes three support pins 582 extending rearward of the lamp, and is supported by the substrate 550 of the light source unit 530 via the support pins 582. At this time, as shown in fig. 11, the three support pins 582 are formed in a substantially inverted L-shaped arrangement.

On the other hand, on the substrate 550, a pair of right and left screw insertion holes 550g1, 550g2 are formed in an upper end region located on the upper side of the heat sink 560, and a screw insertion hole 550g3 is formed in a lower end region located on the lower side of the heat sink 560.

At this time, the screw insertion hole 550g1 is formed in a circular sectional shape, the screw insertion hole 550g2 is formed in an oblong sectional shape elongated in the left-right direction, and the screw insertion hole 550g3 is formed in an oblong sectional shape elongated in the up-down direction.

The light transmission control member 580 is fixed to the substrate 550 by thermal caulking in a state where the tip portions 582a of the three support pins 582 are inserted into the screw insertion holes 550g1, 550g2, and 550g3 of the substrate 550.

Next, the operation and effects of the present embodiment will be described.

The light source unit 530 according to the present embodiment is configured such that the substrate 550 on which the light emitting element 540 is mounted is supported by a heat sink 560 formed by a metal extrusion molding, and the heat sink 560 includes: a substrate mounting surface 562a on which the substrate 550 is mounted; and a first engaging piece 566 and a second engaging piece 568 formed so as to protrude from two portions (two portions in the first direction) in the left-right direction of the substrate placement surface 562a, in addition, the first engaging piece 66 is engaged with the first end surface 550a of the substrate 50 to position the substrate 550 in the left-right direction, and the second engaging piece 568 is engaged with the second end surface 550b of the substrate 550 to elastically press the substrate 550 toward the first engaging piece 566, so that the substrate 550 can be supported by the heat sink 560 without using a screw fastening or the like.

At this time, since the heat sink 560 has the first recess portions 562b extending in the vertical direction (the second direction orthogonal to the first direction) formed at positions adjacent to both the left and right sides of the second engagement piece 568 on the substrate mounting surface 562a, the second engagement piece 568 can be easily bent even if the heat sink 60 is made of metal. In addition, as a result, the second engaging piece 568 can be configured to elastically press the board 550 toward the first engaging piece 566 by engaging with the second end surface 550b of the board 550.

Therefore, the substrate 550 can be supported on the heat sink 560 without performing post-processing such as forming a screw hole on the heat sink 560 formed as a metal extrusion molding, and thus the cost of the light source unit 530 can be reduced.

As described above, according to the present embodiment, the cost of the light source unit 530 in which the substrate 550 on which the light emitting element 540 is mounted is supported by the heat sink 560 can be reduced.

In the present embodiment, the board 550 is supported by the heat sink 560 by being inserted between the first engaging piece 566 and the second engaging piece 568 from above the heat sink 560, but at this time, the pair of left and right protruding portions 550e formed at the upper end portion (the end portion in the second direction) of the board 550 abut against the

upper end surfaces

566e and 568e (the end surfaces in the second direction) of the first engaging piece 566 and the second engaging piece 568, and the board 550 can be reliably positioned in the vertical direction.

In the present embodiment, when the pair of left and right protruding portions 550e abut against the

upper end surfaces

566e, 568e of the first engaging piece 566 and the second engaging piece 568, the pair of left and right engaging portions 550f formed at the lower end portion (the end portion on the opposite side in the second direction) of the board 550 engage with the lower end surfaces 566f, 568f of the first engaging piece 566 and the second engaging piece 568 (the end surfaces on the opposite side in the second direction), and therefore the state in which the board 550 is positioned in the vertical direction with respect to the heat sink 560 can be reliably maintained.

In the above-described embodiment and the modifications thereof, the numerical values shown as specifications are merely examples, and it is needless to say that they may be set to different values as appropriate.

The invention of the present application is not limited to the configurations described in the above embodiments and the modifications thereof, and various modifications other than the above may be made.

Claims

1. A light source unit including a substrate on which a light emitting element is mounted and a heat sink supporting the substrate,

the heat sink is formed as a metal extrusion molding,

2. The light source unit according to claim 1,

the first engaging piece is configured to maintain a state in which the substrate is positioned in a third direction orthogonal to the first direction and the second direction by abutting against a corner portion of the first end surface,

the second engaging piece is configured to be brought into contact with a corner portion of the second end surface, thereby maintaining a state in which the substrate is positioned in the third direction.

3. The light source unit according to claim 2,

the tip end portion of the first engaging piece is configured such that the surface on the second engaging piece side includes a first inclined surface extending in a direction inclined toward the second engaging piece side and a second inclined surface extending from the tip end position of the first inclined surface in a direction inclined toward the opposite side to the second engaging piece, and the first inclined surface abuts against the corner portion of the first end surface,

the surface of the second engaging piece on the first engaging piece side is formed of a concave curved surface formed so as to curve toward the first engaging piece side.

4. The light source unit according to claim 3, wherein an angle between the first inclined surface and the substrate mounting surface is set to a value of 45 ° or more.

5. The light source unit according to any one of claims 1 to 4,

a first opening and a second opening are formed at two positions in the first direction of the substrate,

the first end surface is formed by an end surface of the inner peripheral surface of the first opening portion on the side of the second opening portion,

the second end surface is formed by an end surface of the inner peripheral surface of the second opening portion on the side of the first opening portion,

the first engaging piece is configured to position the substrate in the second direction by abutting against an end surface of the inner peripheral surface of the first opening in the second direction.

6. The light source unit according to claim 5, wherein a slit extending parallel to the second end face is formed in a vicinity of the second end face of the substrate.

7. The light source unit according to any one of claims 1 to 6,

a second groove portion extending in the second direction is formed in at least one portion of the substrate mounting surface, and a screw insertion hole is formed in at least one portion of the substrate,

a tapping screw is fastened to each of the second recess portions through each of the screw insertion holes.

8. The light source unit according to any one of claims 1 to 4,

a pair of protruding portions protruding in the opposite direction to each other toward the first direction are formed at the end portion of the substrate in the second direction,

the pair of protruding portions is configured to position the substrate in the second direction by abutting against the second-direction end surfaces of the first engaging piece and the second engaging piece.

9. The light source unit according to claim 8, wherein a pair of engaging portions that engage with end surfaces of the first engaging piece and the second engaging piece on opposite sides in the second direction when the pair of protruding portions come into contact with the end surfaces of the first engaging piece and the second engaging piece in the second direction are formed at end portions of the substrate on opposite sides in the second direction.