JP2015185426A - Vehicle lighting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lighting capable of obtaining high light distribution performance and suppressing deterioration of luminous efficiency of a light source by enhancing heat dissipation and suppressing thermal deterioration of a lens and misregistration of the lens.SOLUTION: A vehicle lighting includes: a semiconductor light source 12 to irradiate light; a lens 30 that is disposed on a front side of the semiconductor light source 12 and has a pair of leg parts 32a and 32b for attachment; and a heat sink 10 having a mounting surface 110 that mounts thereon the semiconductor light source 12 and the pair of leg parts 32a and 32b and is oriented toward a vehicle front side, and a plurality of radiation fins 114 that are disposed side by side in a vehicle width direction on a rear surface of the mounting surface 110 and extend toward a vehicle rear side.

Description

  The present invention relates to a vehicular lamp.

  2. Description of the Related Art Conventionally, a vehicular lamp using a heat sink in which two LEDs are arranged on a heat sink and a slit is provided between the LEDs in order to suppress a decrease in output due to heat generation of the LED has been disclosed (Patent Document 1).

On the other hand, in recent years, there is an increasing demand for vehicular lamps in which light from a light source such as an LED is directly incident on a lens and light distribution is controlled by the lens.
In such a vehicular lamp, the light distribution control cannot be performed so that the light can be sufficiently incident on the lens by the reflector, as in the case where the light distribution control is performed by the reflector. It is necessary to arrange the lens itself close to the light source so as to be within the range.
For this reason, since a lens is arrange | positioned in the position close | similar to the light source arrangement | positioning surface of a heat sink, the space enclosed by a heat sink and a lens becomes narrow.
And since a light source is arrange | positioned in this narrow space, the heat | fever which a light source emits tends to remain in space, and heat dissipation falls.
If it does so, the temperature of heat sink itself will also rise, the heat | fever will be transmitted, the fixing | fixed part of the lens attached to a heat sink will deform | transform, and there exists a possibility that a light distribution performance may deteriorate by generating the position shift of a lens.
In addition, heat accumulates in the above-described space, and when the temperature in the space becomes high, the lens itself cannot withstand the high temperature and may be thermally deteriorated.
Furthermore, there is a problem that the luminous efficiency of the LED is lowered when the heat is accumulated as described above and the temperature in the vicinity of the light source is increased.

JP 2011-28963 A

  The present invention has been made in view of the problems as described above, and enhances heat dissipation, suppresses thermal degradation of the lens and lens positional deviation, provides high light distribution performance, and reduces light emission efficiency of the light source. An object is to provide a vehicular lamp that can be suppressed.

In order to solve the above problems, the present invention is grasped by the following configuration.
(1) A vehicular lamp according to the present invention includes a light source that emits light, a lens that is disposed in front of the light source and includes a pair of mounting legs, the light source, and the pair of legs. A heat sink having a placement surface facing the front side of the vehicle to be placed and a plurality of heat radiation fins arranged in the vehicle width direction on the back surface of the placement surface and extending to the vehicle rear side, A light source mounting portion for mounting a light source; and a pair of leg mounting portions that are provided on both sides of the light source mounting portion and are substantially flush with the light source mounting portion for mounting the leg portions; The leg mounting portion is bridged by a bridging portion provided in the middle of the radiating fin extending to the vehicle rear side so as to be separated by a groove extending in the vehicle vertical direction.

(2) In the configuration of the above (1), a reinforcing rib that connects between the radiating fins that are cross-linked by the cross-linking portion is provided, and the reinforcing rib is located at a position in the range from the vicinity of the cross-linking portion to the vehicle rear side. Provided.

(3) In the configuration of (1) or (2), a shade is disposed between the light source and the lens and shields a part of light emitted from the light source, and the shade is attached in a pair. And the attachment part is fixed together with the leg part to a fixing part for fixing the leg part provided on the leg part mounting part.

  According to the present invention, there is provided a vehicular lamp that can improve heat dissipation, suppress thermal deterioration of a lens and lens positional deviation, obtain high light distribution performance, and suppress a decrease in light emission efficiency of a light source. be able to.

It is a figure which shows the vehicle lamp which concerns on embodiment of this invention. It is a perspective view which shows the light source unit of the vehicle lamp of FIG. FIG. 3 is an exploded perspective view of the light source unit of FIG. 2. (A) It is a front view of the heat sink of a light source unit. (B) It is AA arrow sectional drawing of (a). (C) It is BB arrow sectional drawing of (a). (D) It is CC sectional view taken on the line of (a).

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 light source unit 1 disposed in the vehicular lamp 101R, and this light source unit is attached so as to close a lamp housing that is opened on the front side of the vehicle (not shown) and the opening of the lamp housing. It arrange | positions in the lamp chamber formed with an outer lens.

  FIG. 3 is an exploded perspective view of the light source unit 1. As illustrated in FIG. 3, the light source 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-issued 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. Although not shown, a connector for supplying current from a power source (battery) to the light emitting chip 12a is attached to the substrate 12b. 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.

The light emitting chip 12a has, for example, a plurality of square chips arranged in a horizontal direction and has a planar rectangular shape as a whole, and its front surface is a light emitting surface.
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)
As shown in FIG. 3, the lens 30 has a pair of mounting legs 32 a and 32 b for mounting on the heat sink 10 at the end of the lens section 31 in the vehicle width direction, and the legs 32 a and 32 b. At the end portion, there are formed mounting structures 33a and 33b provided with two through holes used for mounting on 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, light that may become glare light that irradiates the periphery of the opening 22 is blocked by the periphery of the opening 22.

  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. Two through holes used for attaching to the fixing portions 11a and 11b provided in the portions 113a and 113b are provided.

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 a resin, and may be a metal or the like, but a resin is preferable because it has a high degree of freedom in terms of moldability and the like.
Note that the shade 20 is not necessarily provided. Therefore, the light source unit 1 may not be 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.

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 structure of the heat sink 10 will be described in more detail with reference to FIG.
FIG. 4A is a front view of the heat sink 10, and a cross-sectional view taken along the line AA of FIG. 4A is shown in FIG.

  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 ribs 117a and 117b is provided so that the leg mounting portions 113a and 113b are not deformed so as to change the separation distance when stress is applied. Is provided so as to pass between the radiation fins 114 on the light source mounting part 111 side and the radiation fins 114 on the side of the leg part mounting parts 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 ribs 117a and 117b are provided on the vehicle rear side from the bridge portions 115a and 115b.
In addition, as shown in FIG. 3, the reinforcing ribs 117 a and 117 b are provided so as to pass between the end portions of the radiating fin 114 on the vehicle upper side. The reinforcing ribs 117a and 117b may be provided so as to pass between the end portions of the radiating fin 114 on the vehicle lower side.

As will be described in detail later, the reinforcing ribs 117a and 117b are provided on the vehicle rear side from the bridging portions 115a and 115b, so that the grooves 116a and 116b can be blown up in the vehicle vertical direction.
Here, even if a part of the reinforcing ribs 117a, 117b protrudes slightly from the bridging portions 115a, 115b to the vehicle front side, the state in which the grooves 116a, 116b are blown up in the vehicle vertical direction can be maintained. Therefore, the reinforcing ribs 117a, 117b As long as it is provided at a position in the range from the vicinity of the bridging portions 115a and 115b to the vehicle rear side.

  The reinforcing ribs 117a and 117b are not necessarily provided, but when the reinforcing ribs 117a and 117b are provided, as described above, when stress is applied to the leg mounting portions 113a and 113b, Since it is possible to prevent the distance between the light source mounting portion 111 and the leg mounting portions 113a and 113b from changing, it is preferable to provide the reinforcing ribs 117a and 117b.

  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.

  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 light source 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.

  Prior to attaching the shade 20 and the lens 30 to the heat sink 10, the semiconductor light source 12 is attached to the light source attachment structure 112 of the light source mounting portion 111 of the heat sink 10.

(Operational effect of this embodiment)
As shown in FIG. 2, in the light source 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 the heat is conducted from the light source mounting portion 111 to the leg mounting portions 113a and 113b as indicated by arrows in FIG.
At this time, the air in the portions of the grooves 116a and 116b is warmed, and an updraft along the grooves 116a and 116b is generated.
Then, cold air is sucked along the grooves 116a and 116b from the vehicle lower side of the grooves 116a and 116b so as to be attracted by the flow of the updraft, so that the grooves 116a and 116b are efficiently cooled.

  For example, in FIG. 4B, when there is no groove 116a, 116b between the light source mounting part 111 and the leg part mounting parts 113a, 113b, the above cooling effect cannot be obtained. Accordingly, the temperature of the mounting surface 110 is likely to increase, and the heat is transmitted to the fixing portions 11a and 11b that fix the shade 20 and the lens 30, so that the shade 20 mounting portions 21a and 21b and the lens 30 mounting structures 33a and 33b are formed. The deformation of the shade 20 and the lens 30 is likely to occur.

  More specifically, when the grooves 116a and 116b are not provided as in the present embodiment, the heat generated by the semiconductor-type light source 12 is the shortest distance between the mounting portions 21a and 21b of the shade 20 and the lens 30. Heat is transferred to the mounting structures 33a and 33b, but when the grooves 116a and 116b are provided as in the present embodiment, the semiconductor light source 12 emits as indicated by arrows in FIG. 4B. The heat is transferred by a large detour so as to pass through the bridging portions 115a and 115b.

As described above, since the cooling effect is high in the grooves 116a and 116b, heat is dissipated in the process of being largely bypassed and transferred, and the mounting portions 21a and 21b of the shade 20 It is possible to suppress heat from being transmitted to the mounting structures 33a and 33b of the lens 30.
As a result, it is possible to efficiently suppress deformation and thermal deterioration of the mounting portions 21a and 21b of the shade 20 and the mounting structures 33a and 33b of the lens 30 due to heat.

  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.

  Further, by providing the reinforcing ribs 117a and 117b, the range in which the reinforcing ribs 117a and 117b are provided while the positional relationship between the light source mounting portion 111 and the leg portion mounting portions 113a and 113b can be stably maintained at a predetermined distance. Is set to a position in a range from the vicinity of the bridging portions 115a and 115b to the vehicle rear side so that the air flow in the grooves 116a and 116b is not hindered.

  In the present embodiment, the fixing portions 11a and 11b of the heat sink 10 have a structure that can be shared by the shade 20 and the lens 30, so that the fixing portion for the shade 20 and the fixing portion for the lens 30 are separately formed. Thus, the structure of the fixed portion can be simplified, and the processing cost of the heat sink 10 can be reduced.

  In addition, a part of the air flowing through the grooves 116a and 116b also flows into the periphery of the semiconductor light source 12 that is blocked by the lens 30 and the shade 20 on the front side of the vehicle. In order to prevent the lens 30 and the shade 20 formed of resin from being exposed to a high temperature and thermally deteriorated, the temperature of the semiconductor light source 12 is reduced. It is also possible to suppress a decrease in light emission efficiency accompanying the temperature rise.

  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 Light source unit 10 Heat sink 11a, 11b Fixing part 12 Semiconductor type light source 12a Light-emitting chip 12b Substrate 20 Shade 21a, 21b Mounting part 30 Lens 31 Lens part 32a, 32b Leg part 33a, 33b Mounting structure 40a, 40b Screw 110 Mounting surface 111 Light source mounting portion 112 Light source mounting structure 113a, 113b Leg mounting portion 114 Radiation fins 115a, 115b Bridge portions 116a, 116b Groove 117a, 117b Reinforcement rib

Claims (3)

A light source that emits light;
A lens disposed on the front side of the light source and having a pair of mounting legs;
A heat sink having a mounting surface facing the vehicle front side on which the light source and the pair of leg portions are mounted, and a plurality of radiating fins arranged in the vehicle width direction on the back surface of the mounting surface and extending to the vehicle rear side. With
The mounting surface described above is
A light source mounting portion for mounting the light source;
The light source mounting part is provided across the light source mounting part, and the light source mounting part for mounting the leg part and a pair of leg mounting parts that are substantially flush with the light source mounting part,
The light source mounting portion and the leg mounting portion are bridged by a bridging portion provided in the middle of the radiating fin extending to the vehicle rear side so as to be separated by a groove extending in the vehicle vertical direction. A vehicular lamp characterized by the above. Reinforcing ribs connecting between the heat dissipating fins cross-linked at the cross-linking part,
The vehicular lamp according to claim 1, wherein the reinforcing rib is provided at a position in a range from the vicinity of the bridge portion to the vehicle rear side. A shade that is disposed between the light source and the lens and shields a portion of the light emitted from the light source;
The shade has a pair of attachments;
The vehicular lamp according to claim 1 or 2, wherein the attachment portion is fixed together with the leg portion to a fixing portion that fixes the leg portion provided in the leg portion mounting portion.

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