JP2016173908A - Vehicle lamp fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lamp fitting which may be installed on a small space in a lamp chamber without installing a heat sink at an exterior part when a lamp unit of the vehicle lamp fitting, which uses a semiconductor light emitting element as a light source, is attached to a housing and enables improvement of heat radiation effect of the heat sink.SOLUTION: A vehicle lamp fitting provided in a lamp chamber formed by an outer lens and a housing includes: a light source which radiates light; an optical member 30 which radiates the light from the light source to the vehicle front side; and a heat sink 10 having a placement surface on which the light source and the optical member 30 are placed and heat radiation fins 114 located at the rear side of the placement surface and extending to the vehicle rear side. Attachment parts for attaching the heat sink 10 to the housing are respectively provided at heat radiation fins of the heat radiation fins 114, which are positioned at ends of the heat sink 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicular lamp.

  Conventionally, in the lamp chamber formed by the front lens and the housing, as a structure for fixing the heat sink to the housing, the rear portion of the heat radiating fin provided on the first heat sink disposed in the lamp chamber is sandwiched between the rear cover. A vehicular lamp that is fixed to a second heat sink outside the lamp chamber by screwing is disclosed (Patent Document 1).

In the case of such a lamp, the first heat sink and the second heat sink are fixed by sandwiching the back cover. In order to fix the first heat sink and the second heat sink with high accuracy, it is necessary to match each position, and high positional accuracy is required.
In addition, heat dissipation members such as heat sinks can be fixed with the back cover sandwiched between them.Although heat dissipation can be obtained, each member is deformed by expansion or contraction due to the influence of heat. There was also a risk of lowering optical performance.
Furthermore, since the heat radiation fin provided at the rear end of the first heat sink in the lamp chamber and the second heat sink outside the lamp chamber are screwed and fixed from the rear side, there is a space between the back cover and the first heat sink. Therefore, it is difficult to provide a gap for adjusting the optical axis of the lamp unit.

JP 2007-220619 A

  The present invention has been made in view of the above problems, and when fixing a lamp unit having an LED as a light source to a housing of a vehicular lamp, the lamp unit is fixed to the housing while fixing the heat sink directly to the housing. An object of the present invention is to provide a vehicular lamp that can be installed in a small space.

In order to solve the above problems, the present invention is grasped by the following configuration.
(1) In a vehicle lamp provided in a lamp chamber composed of an outer lens and a housing, a light source for irradiating light, an optical member for irradiating light from the light source toward the front side of the vehicle, the light source and the optical member are mounted. A heat sink having a placement surface (base portion) to be placed and a plurality of heat radiation fins extending to the vehicle rear side behind the placement surface, and heat radiation located at an end of the heat sink among the plurality of heat radiation fins The fin is provided with a housing attachment portion for attaching the heat sink to the housing, one of the housing attachment portions is provided on the tip side of the radiation fin, and the other is on the placement surface side of the radiation fin. A vehicular lamp characterized by being provided.

(2) In the configuration of (1), the light source is mounted on the light source mounting portion of the mounting surface such that the outgoing optical axis faces the front of the vehicle or the side of the vehicle, and the mounting surface of the light source is 2. The vehicle according to claim 1, wherein the vehicle is provided so as to be orthogonal to an outgoing optical axis, and the plurality of heat dissipating fins are formed side by side in the vehicle width direction on the rear surface side of the mounting surface. Lamps.

(3) In the configuration of (2), (the light source is mounted on the light source mounting portion of the mounting surface so that the outgoing optical axis faces the vehicle side, and the mounting surface is the emitted light of the light source. The housing mounting portion is formed on the mounting surface side of the radiating fin on the vehicle outer side, and is formed on the tip side of the radiating fin on the vehicle inner side. The vehicular lamp according to claim 2.

(4) In the configuration of (2), the light source is mounted on the light source mounting portion of the mounting surface so that the outgoing optical axis faces the front of the vehicle, and the mounting surface is connected to the outgoing optical axis of the light source. The housing mounting portion is formed on the mounting surface side of the radiating fin on the vehicle inner side, and formed on the tip side of the radiating fin on the vehicle outer side. The vehicular lamp according to claim 2.

(5) In the configuration of (3) or (4) above, a leg portion mounting portion to which the optical member is attached is provided on an outer side portion of the light source mounting portion of the placement surface of the heat sink, 5. The vehicular lamp according to claim 3, wherein a groove portion that is recessed toward the plurality of heat radiation fins is formed between the light source mounting portion and the leg mounting portion.

  According to the present invention, when fixing a lamp unit having an LED as a light source to a housing of a vehicle lamp, the heat sink can be installed in a small space without installing a heat sink outside, and the heat dissipation effect of the heat sink. It is possible to provide a vehicular lamp that can improve the above.

1 is a perspective view of a vehicular lamp according to an embodiment of the present invention. It is a perspective view which shows the lamp unit of the vehicle lamp of FIG. It is a disassembled perspective view of the lamp unit of FIG. (A) is a front view of the heat sink of the lamp unit, (b) is a cross-sectional view taken along the line AA of (a), (c) is a cross-sectional view taken along the line BB of (a), and (d) is a cross-sectional view taken along the line (a). It is a CC arrow sectional view of). It is DD arrow sectional drawing as described in Fig.4 (a). It is a perspective view at the time of attaching the lamp unit of this invention to a housing.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings.
In this specification, front, rear, upper, lower, left, and right indicate directions viewed from a driver who rides on the vehicle when the vehicular lamp is mounted on the vehicle. The same numbers are assigned to the same elements throughout the description of the embodiments.

As shown in FIG. 1, the vehicular lamp of the present embodiment is vehicular lamps 101R and 101L arranged on the front side of the vehicle 102. In the following description, unless otherwise specified, the vehicular lamp is described. Will describe the right vehicle lamp 101R.
FIG. 2 shows the lamp unit 1 arranged in the vehicular lamp 101R. Although not shown, the lamp unit 5 is opened to the front side of the vehicle, and the lamp housing 5 is opened. It is arrange | positioned in the lamp chamber formed with the outer lens attached so that it may block.

  FIG. 3 is an exploded perspective view of the lamp unit 1. As illustrated in FIG. 3, the lamp unit 1 includes a semiconductor light source 12, a lens 30 disposed in front of the semiconductor light source 12, and a shade 20 disposed between the semiconductor light source 12 and the lens 30. The semiconductor light source 12, the lens 30, and the heat sink 10 on which the shade 20 is disposed are mainly provided.

(Semiconductor light source)
As shown in FIG. 3, the semiconductor-type light source 12 is a self-emitting semiconductor-type light source such as an LED or an EL (organic EL) in which a light-emitting chip 12a is mounted on a substrate 12b. The light emitting chip 12a may be packaged by sealing with a sealing resin. A connector for supplying current to the substrate 12b is attached. The substrate 12 b is attached to the light source attachment structure 112 provided in the light source mounting part 111 of the heat sink 10.

For example, the light emitting chip 12a has a plurality of square chips arranged in a horizontal direction,
The chip is not limited to a square, but may be a rectangle, and the number of chips used is not limited to a plurality, and may be one.

(lens)
The lens 30 includes a lens part 31 and leg parts 32a and 32b. The lens unit 31 is formed of an incident surface and an output surface that irradiate light from the semiconductor light source 12 as a predetermined light distribution pattern. As shown in FIG. 3, a pair of mounting legs 32a and 32b for mounting on the heat sink 10 is formed at the end of the lens section 31 in the vehicle width direction, and at the ends of the legs 32a and 32b. Are formed with attachment structures 33a and 33b provided with two through holes used for attachment to the fixing portions 11a and 11b provided on the leg mounting portions 113a and 113b of the heat sink 10.
For the lens 30, for example, a light transmissive material such as an acrylic resin or a polycarbonate resin can be suitably used.

(shade)
As shown in FIG. 3, the shade 20 is disposed between the semiconductor light source 12 and the lens 30, and has an opening 22 so that the light from the semiconductor light source 12 is irradiated to the lens portion 31. The light passing through 22 enters the lens unit 31. On the other hand, the light irradiated to the periphery of the opening 22 is shielded by the shade 22 so as not to enter the lens unit 31, and light that may become glare light to an oncoming vehicle or the like is suppressed.

  Similarly to the lens 30, the shade 20 has a pair of attachment portions 21 a and 21 b for attachment to the heat sink 10 at the end in the vehicle width direction. The attachment portions 21 a and 21 b are respectively mounted with legs of the heat sink 10. Two through holes used for attaching to the fixing portions 11a and 11b provided in the portions 113a and 113b are provided. The attachment portions 21 a and 21 b of the shade 20 are fixed by being sandwiched between the leg portions 32 a and 32 b of the lens 30 and the leg mounting portions 113 a and 113 b of the heat sink 10.

Similarly to the lens 30, the shade 20 can be preferably made of a material such as an acrylic resin or a polycarbonate resin, but is colored because it is necessary to shield light. The shade 20 is not limited to resin, and may be metal or the like.
In addition, the shade 20 does not necessarily need to be provided, and therefore there is a case where the lamp unit 1 is not provided with the shade 20.

(heatsink)
The heat sink 10 is made of a metal member, a resin member, or the like having high thermal conductivity. In the present embodiment, the heat sink 10 is made of aluminum die cast.
As shown in FIG. 3, a mounting surface 110 for mounting the semiconductor light source 12, the lens 30 and the shade 20 is provided so as to face the vehicle front side, and the back surface (vehicle rear side) of the mounting surface 110. A plurality of heat radiation fins 114 arranged in the vehicle width direction are formed so as to extend to the vehicle rear side. If the mounting surface 110 is on the vehicle front side, the mounting surface 110 may be provided so as to be inclined toward the vehicle side.

In addition, the mounting surface 110 is provided with a light source mounting portion 111 at the center, and a pair of leg mounting portions 113a and 113b substantially flush with the light source mounting portion 111 on both sides of the light source mounting portion 111. It has been.
As shown in FIG. 3, a pair extending in the vehicle vertical direction so that the light source mounting part 111 and the leg mounting parts 113a and 113b are separated from each other between the light source mounting part 111 and the leg mounting parts 113a and 113b. Grooves 116a and 116b are provided. The grooves 116a and 116b have a shape recessed toward the plurality of heat radiation fins 114.

The structure of the heat sink 10 will be described in more detail with reference to FIG.
4A is a front view of the heat sink 10 in which the lens 30 and the shade 20 are omitted from the lamp unit 1, and a cross-sectional view taken along line AA of FIG. 4A is shown in FIG. 4B.

  As can be seen from FIG. 4B, in the grooves 116a and 116b, bridge portions 115a and 115b are provided in the middle of the radiating fins 114 extending to the rear side of the vehicle (the lower side of the paper). By the portions 115a and 115b, the light source mounting portion 111 and the leg mounting portions 113a and 113b are connected to each other while maintaining a state of being separated by the grooves 116a and 116b.

  Further, in the present embodiment, as shown in FIG. 3, a pair of reinforcing plate portions 117a, 117a, 117a, 113b, so as to prevent deformation that changes the separation distance when stress is applied to the leg mounting portions 113a, 113b. 117b is provided so as to pass between the radiating fin 114 on the light source mounting portion 111 side and the radiating fin 114 on the leg portion mounting portions 113a and 113b sandwiching the grooves 116a and 116b.

4 (c) shows a cross-sectional view taken along line BB in FIG. 4 (a), and FIG. 4 (d) shows a cross-sectional view taken along line CC in FIG. 4 (a). is there.
4 (c) and 4 (d), the right side of the page is the vehicle rear side, and the left side is the vehicle front side.

As shown in FIGS. 4C and 4D, the reinforcing plate portions 117a and 117b are provided on the vehicle rear side from the bridge portions 115a and 115b.
Further, as shown in FIG. 3, the reinforcing plate portions 117 a and 117 b are provided so as to pass between the end portions on the vehicle upper side of the radiating fins 114. The reinforcing plate portions 117a and 117b may be provided so as to pass between the end portions of the radiating fins 114 on the vehicle lower side.

  Further, as shown in FIG. 3, in the present embodiment, the leg mounting portions 113a and 113b are provided with a pin structure extending forward of the vehicle and a screw spiral groove for fixing the lens 30 and the shade 20. Fixing portions 11a and 11b each having a hole are provided.

  A structure for mounting the heat sink 10 to the housing 5 will be described with reference to FIG. 5 (cross-sectional view taken along the line DD in FIG. 4) and FIG. Housing mounting portions 118 a and 118 b are provided on the heat radiation fins 114 located on the outer side of the heat sink 10 in the vehicle width direction and on the left and right ends of the semiconductor light source 12.

  The housing mounting portion 118a is provided at two locations on the upper and lower sides of the heat dissipating fins 114 disposed on the inner side of the vehicle, and the housing mounting portion 118b disposed on the outer side of the vehicle is disposed at one upper position of the heat dissipating fins 114 on the outer side of the vehicle. ing. In this embodiment, the housing mounting portions 118a and 118b have been described as being arranged at two locations on the vehicle inner side and one location on the vehicle outer side, but this is not restrictive.

  The housing attachment portion 118a is connected by a plate-like member extending from the heat radiating fin 114, and reinforcing ribs 119 are formed between the upper and lower housing attachment portions 118a.

  The housing mounting portion 118a formed on the inner side of the vehicle is formed at a position away from the light source mounting portion 111 on the distal end side of the radiating fin 114, and the housing mounting portion 118b formed on the outer side of the vehicle has the radiating fin 114. Is formed at a position close to the light source mounting portion 111. For this reason, when the side illumination lamp is disposed so as to face sideways, the housing mounting portions 118 a and 118 b can be set at positions close to the surface of the housing 5.

  The housing 5 is provided with bosses 51 for mounting the housing mounting portions 118a and 118b of the heat sink 10 so that the housing mounting portions 118a and 118b of the heat sink 10 can be mounted to the housing 5 from the front side of the vehicle by the screw 52. It has become.

  The housing mounting portions 118a and 118b each have a surface facing the vehicle front direction and a through hole extending in the vehicle axial direction. When the heat sink 10 is fixed to the housing 5, the screw 52 is attached to the boss 51 from the vehicle front direction. It comes to be assembled by. As a result, even when the vehicular lamp 101R is slanted greatly and the mounting surface 110 of the lamp unit 1 is inclined with respect to the vehicle axis, it can be easily assembled from the front of the vehicle, so that the assemblability is excellent. .

  In the present embodiment, the light source mounting portion 111 is provided so as to be inclined so that the surface on which the semiconductor light source 12 is mounted intersects with the vehicle axis and to face the vehicle side. Even in such a case, since the attachment direction when attaching the heat sink 10 to the housing 5 is substantially the same direction as the vehicle shaft, it is easy to attach the heat sink 10 from the front side of the vehicle and from the opening side of the housing 5.

  Further, when the heat sink 10 is attached to the housing 5, the heat radiation fins 114 of the heat sink 10 are accommodated, and an accommodating portion 53 for forming a space between the housing 5 and the heat sink 10 is formed.

  The accommodating portion 53 accommodates the radiating fins 114 provided so as to extend to the rear of the mounting surface 110, and in the horizontal section, a plurality of the radiating fins 114 arranged in a row and the accommodating portion 53 of the housing 5 are arranged. It is formed so that the intervals are substantially equal. For this reason, even when the heat sink 10 is directly fixed to the housing 5, a space is formed between the heat sink 10 and the housing 5, and the heat dissipation effect of the heat sink 10 due to convection of air in the lamp chamber can be improved.

  A method for assembling the lamp unit 1 will be described. First, the semiconductor light source 12 is attached to the light source mounting structure 112 of the light source mounting portion 111 of the heat sink 10, and then the heat sink 10 is attached to the boss 51 of the housing 5 through the through holes provided in the housing mounting portions 118 a and 118 b. It is fixed from the vehicle front side by a screw 52.

  And while inserting the pin structure extended in the vehicle front side of the fixing | fixed part 11a, 11b of the heat sink 10 to the upper through-hole provided in the attaching part 21a, 21b of the shade 20, and the attachment structure 33a, 33b of the lens 30, The screws 40a and 40b are passed through the lower through holes provided in the mounting portions 21a and 21b of the shade 20 and the mounting structures 33a and 33b of the lens 30, and the spiral grooves for the screws of the fixing portions 11a and 11b of the heat sink 10 are provided. The lamp unit 1 shown in FIG. 2 is assembled by fastening the shade 20 and the lens 30 together with the leg mounting portions 113a and 113b of the heat sink 10 by screwing into the holes.

(Operational effect of this embodiment)
As shown in FIGS. 2 and 5, the heat sink 10 of the lamp unit 1 is provided with housing mounting portions 118 a and 118 b on the outer fins of the plurality of radiating fins 114.
When the heat sink 10 is attached to the housing 5, the heat sink 10 is directly attached to the housing 5 by providing the housing attaching portions 118a and 118b on the heat dissipating fins 114 located on the outer end of the heat dissipating fins 114 extending to the rear side of the vehicle. In this case, the heat sink 10 can be installed in a small space without installing the heat sink 10 outside, and can be installed without reducing the heat radiation effect by the heat radiation fins 114. At this time, when the housing 5 has a space behind the heat sink fin 114 of the heat sink 10 and the housing portion 53 for housing the heat sink 5 is provided, the space between the housing 5 and the heat sink 10 is sufficiently maintained. It can be attached to the housing 5 without degrading the heat dissipation performance of the heat sink 10.

  Further, since the heat dissipating fins 114 of the heat sink 10 are formed on the back surface side of the mounting surface 110 in the vehicle width direction and have a surface extending in the vertical direction, the housing mounting portions 118a and 118b are connected to the heat dissipating fins 114. It becomes easy to provide on the surface. Accordingly, the housing mounting portions 118a and 118b can be provided at appropriate positions on the outer side in the vehicle width direction of the heat sink 10 with respect to the shape of the housing 5, and the degree of freedom in installing the lamp unit 1 is improved. Further, as shown in FIGS. 2 and 3, since the housing mounting portion 118a is set in the surface shape of the radiating fin 114, when the housing mounting portions 118a and 118b are provided at two locations in the vertical direction, It is also easy to provide reinforcing ribs 119 that connect the two.

When the lamp unit 1 is a side illumination lamp such as a cornering lamp and is installed toward the side of the vehicle, if the housing mounting portion 118a inside the vehicle is provided on the mounting surface 110 side, the housing 5 The mounting portion (for example, the boss 51) is set at a position away from the inner wall of the lamp, and the boss 51 needs to be set long and thick to a position close to the placement surface 110 of the lamp unit 1. As a result, there is a possibility that defects such as sink marks may occur in the housing 5.
Therefore, as shown in FIG. 5, the housing mounting portion 118 a provided on the inner side in the vehicle width direction of the lamp unit 1 is installed on the front end side of the radiating fin 114, and the housing mounting portion 118 b provided on the outer side in the vehicle width direction of the lamp unit 1. Is installed on the mounting surface 110 side of the heat radiation fin 114. Thereby, even if it is a lamp for side illuminations, such as a cornering lamp, and the semiconductor type light source 12 and the mounting surface 110 are attached in the state inclined toward the side, the vehicular lamps 101L, 101R. It is easy to install in the space inside the lamp room.

  Next, when the lamp unit 1 is installed in the vehicle front direction, that is, the lamp unit 1 installed so that the semiconductor-type light source 12 and the mounting surface 110 are orthogonal to the vehicle axis will be described.

  When the lamp unit 1 has a shape in which the vehicle headlamps 101R and 101L are slanted and is installed on the inner side in the vehicle width direction of the entire vehicle headlamps 101R and 101L, a housing is provided on the vehicle inner side of the lamp unit 1 in the vehicle. 5, the inner wall of the housing 5 exists at a position where the inner wall of the housing 5 is retracted rearward on the vehicle outer side of the lamp unit 2, and is in an open state. Therefore, the housing mounting portion 118a is provided on the mounting surface 110 side of the radiating fin 114 located at the inner end of the vehicle in the heat sink 10 of the lamp unit 1, and on the distal end side of the radiating fin 114 located at the outer end of the vehicle. By providing the housing mounting portion 118b, it is easy to mount without greatly projecting into the lamp chamber of the vehicular lamps 101R, 101L.

Further, as shown in FIG. 2, in the lamp unit 1, the light source mounting portion 111 and the leg mounting portions 113a and 113b are separated by grooves 116a and 116b extending in the vehicle vertical direction. .
When the semiconductor light source 12 emits light, heat is generated, and as shown by arrows in FIG. 4B, the heat is transferred from the light source mounting portion 111 to the leg mounting portions 113a and 113b, and further to the housing mounting portion 118a, Heat conducts to 118b.
When the grooves 116a and 116b are provided as in the present embodiment, the heat generated by the semiconductor light source 12 is large so as to pass through the bridging portions 115a and 115b, as indicated by arrows in FIG. 4B. The heat will be bypassed.

Since the grooves 116a and 116b easily generate convection in the vertical direction and have a high cooling effect, heat is dissipated in the process of being largely detoured and transferred, and the mounting portions 21a and It is possible to prevent heat from being transmitted to the mounting structures 33a and 33b of the lens 21b and the lens 30 and the housing mounting portions 118a and 118b.
As a result, it is possible to efficiently suppress deformation and thermal deterioration due to heat transmitted to the mounting portions 21a and 21b of the shade 20, the mounting structures 33a and 33b of the lens 30, and the housing mounting portions 118a and 118b.

  Further, since the grooves 116a and 116b are adjacent to the light source mounting portion 111, the heat of the light source mounting portion 111 is efficiently radiated, and therefore, the temperature rise of the semiconductor light source 12 itself can be suppressed through the light source mounting portion 111. It is possible to suppress a decrease in luminous efficiency due to the temperature rise of the light source 12.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Lamp unit 10 Heat sink 11a, 11b Fixing part 12 Semiconductor type light source 12a Light emitting chip 12b Substrate 20 Shade 21a, 21b Shade attaching part 30 Lens (optical member)
31 Lens part 32a, 32b Leg part 33a, 33b Mounting structure 40a, 40b Screw 110 Mounting surface 111 Light source mounting part 112 Light source mounting structure 113a, 113b Leg part mounting part 114 Radiation fin 115a, 115b Bridging part 116a, 116b Groove (groove part) )
117a, 117b Reinforcing plate portions 118a, 118b Heat sink mounting portion 119 Reinforcing rib 5 Housing 51 Boss 52 Screw 53 Housing portion

Claims (5)

In a vehicle lamp provided in a lamp chamber composed of an outer lens and a housing,
A light source that emits light;
An optical member for irradiating the vehicle front side with light from the light source;
A mounting surface on which the light source and the optical member are mounted;
A heat sink having a plurality of heat dissipating fins extending to the vehicle rear side behind the placement surface,
Of the plurality of heat radiating fins, a heat radiating fin located at the end of the heat sink is provided with a housing attachment portion for attaching the heat sink to the housing, and one of the housing attachment portions is provided on a front end side of the radiating fin. A vehicle lamp characterized in that the other is provided on the mounting surface side of the radiating fin. The light source is mounted on the light source mounting portion of the mounting surface so that the outgoing optical axis faces the front of the vehicle or the side of the vehicle,
The mounting surface is provided so as to be orthogonal to the emission optical axis of the light source, and the plurality of radiating fins are formed side by side in the vehicle width direction on the back surface side of the mounting surface. The vehicular lamp according to claim 1. The light source is mounted on the light source mounting portion of the mounting surface so that the outgoing optical axis faces the vehicle side,
The mounting surface is provided so as to be orthogonal to the emission optical axis of the light source,
3. The vehicle according to claim 2, wherein the housing mounting portion is formed on a front end side of the radiating fin on the inner side of the vehicle and is formed on a placement surface side of the radiating fin on the outer side of the vehicle. Lamps. The light source is mounted on the light source mounting portion of the mounting surface so that the outgoing optical axis faces the front of the vehicle,
The mounting surface is provided so as to be orthogonal to the emission optical axis of the light source,
3. The vehicle according to claim 2, wherein the housing mounting portion is formed on a mounting surface side of the radiation fin on the inside of the vehicle, and is formed on the tip side of the radiation fin on the outside of the vehicle. Lamps. Outside the light source mounting part of the mounting surface of the heat sink, a leg mounting part to which the optical member is attached is provided,
5. The vehicular lamp according to claim 3, wherein a groove portion that is recessed toward the plurality of heat radiation fins is formed between the light source mounting portion and the leg mounting portion.