JP6375145B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp, and more particularly to a heat dissipation structure thereof.

  Recently, the light source of a vehicular lamp is composed of an optical semiconductor element such as a light emitting diode (LED) element or a laser diode (LD) element.

  In particular, light-emitting elements such as LED elements and LD elements have a negative characteristic that their lifetime and performance are reduced by the heat generated by themselves. Moreover, the phosphor layer used for the purpose of changing the emission color by combining with the light emitting element also has a negative characteristic due to heat. Therefore, the temperature rise of the light emitting element and the phosphor layer becomes a problem, and there is a demand for a heat dissipation structure that raises the heat radiation efficiency of the light emitting element and the phosphor layer and keeps the light emitting element and the phosphor layer below an appropriate temperature.

  In the conventional vehicular lamp, the curved surface portion of the base of the light emitting element in the lamp and the curved surface portion of the housing are brought into surface contact with the heat conductive grease. As a result, the heat generated in the light emitting element is radiated to the heat sink outside the housing via the contact portion where the thermal resistance between the curved surface portion of the base and the curved surface portion of the housing is small. The heat is dissipated outside the lamp. Moreover, even if the optical axis is adjusted by rotating the base by the aiming mechanism, the contact relationship between the curved surface portion of the base and the curved surface portion of the housing is maintained, so that a reduction in heat dissipation performance can be suppressed (see: Patents). Reference 1).

JP 2011-18520 A

  However, in the above-described conventional vehicle lamp, since the surface contact between the curved surface portion of the base of the light emitting element and the curved surface portion of the housing is performed only by the heat conductive grease, it is caused by vibration, impact, etc. when the vehicle travels. There exists a subject that the curved surface part of a base and the curved surface part of a housing may space apart, and it may become impossible to maintain a thermal radiation structure.

  Further, in the above-described conventional vehicle lamp, the thermal resistance of the contact portion between the curved surface portion of the base and the curved surface portion of the housing is not sufficiently small. Therefore, in order to compensate for this, heat is radiated outside the lamp. There is also a problem that the heat sink becomes larger and eventually the optical unit becomes larger, that is, heavier.

In order to solve the above-described problems, a vehicular lamp according to the present invention includes a housing, a light emitting element, a heat source side heat diffusion plate provided with a light emitting element on the surface side, and an upper portion of the heat source side heat diffusion plate bracketed. A vertical adjustment aiming bolt fixed to the housing through the housing, a housing side heat diffusion plate provided on the inner surface of the bottom of the housing, and a connecting member slidably connected to the housing side heat diffusion plate, and on the heat source side The curved front end of the lower part of the heat diffusion plate is housed in a recess at the bottom of the housing, and the heat source side heat diffusion plate is rotated about the center of the curved front end of the heat source side heat diffusion plate in the recess of the housing by the vertical adjustment aiming bolt The curved distal end portion of the connection member is inscribed in the concave portion of the housing in contact with the curved distal end portion of the heat source side heat diffusion plate . Furthermore, it has a left / right adjustment aiming bolt that fixes the lower part of the heat source side heat diffusion plate to the housing via a bracket, and the heat source side heat diffusion plate is substantially centered on the opposite side of the left / right adjustment aiming bolt by the left / right adjustment aiming bolt. It was made to rotate as an axis.

  And a housing-side heat diffusion plate provided on the inner surface of the bottom of the housing, and a connection member slidably connected to the housing-side heat diffusion plate. It is inscribed with the curved tip of the diffuser plate.

According to the present invention, the heat source side heat diffusion plate where the light emitting element is provided are fixed to the housing by vertically adjusting aiming bolt, vibration during vehicle run line, the heat dissipation structure can be maintained by an impact or the like. In addition, since the curved distal end portion of the lower part of the heat source side heat diffusion plate is accommodated in the recess of the housing, the thermal resistance of the contact is also reduced, and therefore there is no need to increase the size of the heat sink. Weight can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows 1st Embodiment of the vehicle lamp which concerns on this invention, Comprising: (A) is a whole perspective view partly notched, (B) is the elements on larger scale of the diffusion plate connection part of (A). It is a perspective view. It is a sectional side view of the vehicle lamp of FIG. 1, (A) is a whole sectional side view, (B) is a partial expanded sectional side view of the diffusion plate connection part of (A). It is a bottom view of the vehicle lamp of FIG. It is the perspective view seen from the bottom of the housing | casing side heat diffusion board of FIG. It is a perspective view which shows 2nd Embodiment of the vehicle lamp which concerns on this invention, Comprising: (A) is the whole perspective view partly notched, (B) is the elements on larger scale of the diffusion plate connection part of (A). It is a perspective view. It is a perspective view which shows the example of a change of the slit of the heat-source side heat-diffusion board of FIG. It is a perspective view which shows 3rd Embodiment of the vehicle lamp which concerns on this invention, Comprising: (A) is a whole perspective view partly notched, (B) is the elements on larger scale of the diffusion plate connection part of (A). It is a perspective view. It is a perspective view which shows 4th Embodiment of the vehicle lamp which concerns on this invention, Comprising: (A) is the whole perspective view partly notched, (B) is the elements on larger scale of the heat sink of (A). is there. It is a perspective view which shows 5th Embodiment of the vehicle lamp which concerns on this invention, Comprising: (A) is the whole perspective view partly notched, (B) is the elements on larger scale of the diffusion plate connection part of (A). It is a perspective view. It is a table | surface which shows the weight of the optical unit of the vehicle lamp which concerns on this invention. It is a table | surface which shows the temperature of the light emitting element vicinity by the aiming operation | movement of the vehicle lamp which concerns on this invention.

  1A and 1B are perspective views showing a first embodiment of a vehicular lamp according to the present invention, in which FIG. 1A is an overall perspective view with a part cut away, and FIG. 1B is a diffusion plate connecting portion of FIG. FIG.

  In FIG. 1A, a vehicular lamp is a vehicle headlamp, and an optical unit is formed by a vertical adjustment aiming bolt 4 and a left / right adjustment aiming bolt 5 in a casing constituted by an outer lens 1 and a housing 2. 6 is fixed.

  The optical unit 6 includes a bracket 61 made of a highly heat conductive metal such as aluminum or copper, and fixing bolts 61a and 61b (shown in FIG. 3) fixed to the housing 2 by the up and down adjustment aiming bolt 4 and the left and right adjustment aiming bolt 5. The heat source side heat diffusing plate 62 fixed to the bracket 61 by the above, the support substrate 65 and the light emitting element 66 provided on the surface of the heat source side heat diffusing plate 62, and the housing side heat diffusing plate 63 fixed to the inner surface of the bottom of the housing 2. And a heat sink 67 provided on the back surface of the heat source side heat diffusion plate 62. If necessary, a lens or the like is provided on the support substrate 65, and a phosphor layer or the like is provided on the light emitting element 66.

  As shown in FIG. 1B, the curved leading end 62a of the heat source side heat diffusion plate 62 is curved in an arc shape. On the other hand, a connection member 64 is slidably connected to the housing-side heat diffusion plate 63, and a curved tip end portion 64a of the connection member 64 is also curved in an arc shape. The curved distal end portion 62 a of the heat source side heat diffusion plate 62 and the curved distal end portion 64 a of the connection member 64 are accommodated in the concave portion 2 a at the bottom of the housing 2. In this case, the cross-sectional shape of the recess 2a of the housing 2 is preferably circular, and has a shape that is formed larger than the outer shape of the curved tip 62a and has play. Accordingly, the curved leading end portion 62 a of the heat source side heat diffusion plate 62 is inscribed in the concave portion 2 a of the housing 2, and the curved leading end portion 64 a of the connection member 64 is inscribed in the curved leading end portion 62 a of the heat source side heat diffusion plate 62. As a result, the upper part of the heat source side heat diffusion plate 62 is fixed to the bracket 61 by the fixing bolt 61a, the bracket 61 is fixed to the housing 2 by the aiming bolts 4 and 5, and the lower part of the heat source side heat diffusion plate 62 is the housing 2 The heat source side heat diffusing plate 62 is not separated from the housing 2 due to vibration, impact, etc. even when the vehicle is running. As a result, the heat-source-side heat diffusion plate 62 can rotate about the curved tip 62a as a substantially central axis, and can also rotate with respect to the housing-side heat diffusion plate 63 via the connecting member 64, thereby exhibiting an aiming function. it can. Here, the reason why the approximate center axis is used is that, as described above, since the left and right adjustment aiming bolts 5 are provided and the recess 2a of the housing 2 is provided with play, the center axis is not strictly set.

  A heat conductive material (TIM) (not shown) such as heat conductive grease is filled between the curved front end portion 62 a of the heat source side heat diffusion plate 62 and the curved front end portion 64 a of the connection member 64. In this way, the heat generated in the light emitting element 66 is diffused from the heat source side heat diffusion plate 62 through the curved tip end portion 62a of the concave portion 2a of the housing 2 and the curved tip end portion 64a of the connection member 64. Since heat is efficiently radiated to the plate 63 without heat conduction loss, the heat radiation performance can be improved.

  The heat-source-side heat diffusion plate 62, the housing-side heat diffusion plate 63, and the connection member 64 are made of a material with good workability and good heat conductivity, for example, an aluminum alloy A6063 having a heat conductivity of 200 W / mK. In this case, the surface of the aluminum alloy is treated with black alumite (registered trademark), thereby increasing the emissivity to, for example, 0.9 to 0.98. However, in order to reduce the contact thermal resistance between components, the contact surfaces of the heat source side heat diffusion plate 62, the case side heat diffusion plate 63 and the connection member 64 and the contact surfaces of the housing 2 and the heat sink 67 are black anodized ( The mirror surface processing which removes (registered trademark) is given.

  The heat source side heat diffusing plate 62, the case side heat diffusing plate 63 and the connecting member 64 are made of a metal such as copper or ceramic particles or metal filler in addition to the above-mentioned aluminum alloy A6063 for the purpose of weight reduction. It may be a composite of high thermal conductive resin, isotropic carbon or anisotropic crystalline graphite sheet having light weight and high thermal conductivity, graphite sheet having both heat dissipation and reliability, and metal.

  Further, as described above, the heat conductive material (TIM) is filled between the curved distal end portion 62a of the heat source side heat diffusion plate 62, the housing side heat diffusion plate 63, and the connection member 64, but instead, A thixotropic material may be filled. For example, a silicone resin containing ceramic particles such as alumina, an epoxy resin or an acrylic resin containing silica fine powder, a colloidal hydrated aluminum silicate, or an organic composite may be filled. In the stationary state, the thixotropic material does not have fluidity, and therefore the optical unit 6 is adjusted and fixed at a certain setting angle by the up and down adjustment aiming bolt 4 and the left and right adjustment aiming bolt 5. On the other hand, when the set angle of the optical unit 6 is adjusted with the up / down adjustment aiming bolt 4 or the left / right adjustment aiming bolt 5, the thixotropic material flows and the curved tip 62 a of the heat source side heat diffusion plate 62 and the connection member 64 becomes movable. That is, normally, heat transfer loss of conduction occurs due to contact thermal resistance between the curved front end portion 62a of the heat source side heat diffusion plate 62 and the curved front end portion 64a of the connection member 64. Thermal resistance can be reduced.

  2 is a side sectional view of the vehicular lamp of FIG. 1, wherein (A) is an overall side sectional view, and (B) is a partially enlarged side sectional view of a diffusion plate connecting portion of (A).

  The vertical aiming operation will be described with reference to FIG. By tightening the vertical adjustment aiming bolt 4, the heat source side heat diffusion plate 62 of the optical unit 6 rotates clockwise around the curved tip 62 a in the concave portion 2 a of the housing 2. As a result, the optical axis of the light emitting element 66 is adjusted upward. On the other hand, by loosening the vertical adjustment aiming bolt 4, the heat source side heat diffusion plate 62 of the optical unit 6 rotates counterclockwise around the curved tip 62 a in the recess 2 a of the housing 2. As a result, the optical axis of the light emitting element 66 is adjusted downward. The heat source side heat diffusing plate 62, the connecting member 64, and the recess 2a of the housing 2 are designed so that the optical axis of the light emitting element 66 can move within a range of ± 5 ° above and below the center position.

  FIG. 3 is a bottom view of the vehicular lamp of FIG. 1, and FIG. 4 is a perspective view of the case side heat diffusion plate 63 of FIG.

  The horizontal aiming operation will be described with reference to FIG. By tightening the left / right adjustment aiming bolt 5, the heat-source-side heat diffusion plate 62 of the optical unit 6 rotates clockwise as viewed from above the substantially opposite side of the left / right adjustment aiming bolt 5. As a result, the optical axis of the light emitting element 66 is adjusted to the right. On the other hand, by loosening the left / right adjustment aiming bolt 5, the heat source side heat diffusion plate 62 of the optical unit 6 rotates counterclockwise as viewed from above with the opposite side of the left / right adjustment aiming bolt 5 as the central axis. As a result, the optical axis of the light emitting element 66 is adjusted to the left. In this case as well, the heat source side heat diffusing plate 62, the connecting member 64, and the recess 2a of the housing 2 are designed such that the optical axis of the light emitting element 66 can move within a range of ± 5 ° to the left and right of the center position. Also in the left-right direction aiming, the recess 2a of the housing 2 is provided with play, so that the opposite side of the left-right adjustment aiming bolt 5 is the substantially central axis.

  As shown in FIG. 3, the connection member 64 has a semicircular or trapezoidal plate shape. On the other hand, as shown in FIG. 4, in order to accommodate the connection member 64 and secure the movable range of the connection member 64, the heat source side heat diffusion plate 62 side of the back surface of the housing side heat diffusion plate 63 is semicircular. A trapezoidal or rectangular recess 63a is formed. However, the shape of the recess 63a of the housing-side heat diffusion plate 63 and the shape of the connection member 64 can be appropriately changed as long as the connection member 64 is movable. At this time, heat conduction material (TIM) or thixotropic material such as heat conduction grease is used between the case side heat diffusion plate 63 and the connection member 64 so that the case side heat diffusion plate 63 and the connection member 64 can be lubricated. Filled in between. In this case, a line slit 63b for filling with a heat conductive material (TIM) is provided in the recess 63a of the housing-side heat diffusion plate 63. However, the line slit 63b may be a concentric arc slit, a dot-like uneven structure, or a combination thereof.

  FIGS. 5A and 5B are perspective views showing a second embodiment of a vehicular lamp according to the present invention, in which FIG. 5A is a partially cutaway whole perspective view, and FIG. 5B is a diffusion plate connecting portion of FIG. FIG.

  In FIG. 5, the slit 62b is provided in the lower part of the heat-source side thermal diffusion plate 62 of FIG. Thereby, the low temperature air in front of the heat source side heat diffusion plate 62 is naturally convected to the heat sink 67 side to enhance the cooling effect. In this case, as shown in FIG. 6, pressure loss is reduced by processing the slit 62b into a three-dimensional crease slit 62b ′ by alternately repeating a mountain fold and a valley fold, and the cooling effect by natural convection is further enhanced. be able to. In this case, the height of the heat source side heat diffusion plate 62 can also be reduced, so that the optical unit 6 can be reduced in size.

  7A and 7B are perspective views showing a third embodiment of a vehicular lamp according to the present invention, in which FIG. 7A is a partially cutaway overall perspective view, and FIG. 7B is a diffuser plate connecting portion of FIG. FIG.

  In FIG. 7, a flexible housing-side heat diffusion plate 63 'is provided instead of the housing-side heat diffusion plate 63 of FIG. The housing-side heat diffusion plate 63 ′ is bent according to the shape of the housing 2. As a result, the contact area between the housing-side heat diffusion plate 63 ′ and the housing 2 increases, and the heat dissipation performance can be improved. In this case, in order to match the complicated shape of the housing 2, the housing-side heat diffusion plate 63 ′ is configured using a metal plate, a graphite sheet, or a composite material thereof.

  FIGS. 8A and 8B are perspective views showing a fourth embodiment of a vehicular lamp according to the present invention, in which FIG. 8A is an overall perspective view with a part cut away, and FIG. 8B is a partially enlarged view of a heat sink in FIG. It is a perspective view.

  In FIG. 8, a heat sink 68 is provided on the outer surface of the housing 2 facing the housing side heat diffusion plate 63 'of FIG. Thereby, heat dissipation performance can be improved. In this case, if only the connection portion of the heat sink 68 of the housing 2 is formed by metal insert molding, the thermal resistance of heat conduction can be reduced and the heat dissipation performance can be improved. In place of the heat sink 68, a heat diffusing plate (not shown) may be used although the heat radiation performance is lowered.

  Note that the heat sink 68 of FIG. 8 or other housing side heat diffusion plate can also be provided in the housing 2 of FIGS. 1, 2, 3, and 5.

  FIGS. 9A and 9B are perspective views showing a fifth embodiment of a vehicular lamp according to the present invention, in which FIG. 9A is an overall perspective view with a part cut away, and FIG. 9B is a diffusion plate connecting portion of FIG. FIG.

  In FIG. 9, an optical unit 16 is added to the vehicular lamp of FIG. For example, the optical unit 6 is for a low beam, and the optical unit 16 is for a high beam.

  As shown in FIG. 9A, the optical unit 16 is fixed in a casing constituted by the outer lens 1 and the housing 2 by a fulcrum pivot 13, a vertical adjustment aiming bolt 14, and a left / right adjustment aiming bolt 15. Yes.

  The optical unit 16 is similar to the optical unit 6 except that the housing side heat diffusion plate 63 of the optical unit 6 is used as a common component, the curved front end portion of the heat source side heat diffusion plate and the curved front end portion of the connection member are the housing 2. The heat source side heat diffusing plate 162 is attached to the housing 2 without using a bracket.

  The optical unit 16 is provided on the surface of the heat source side heat diffusion plate 162 and the heat source side heat diffusion plate 162 fixed to the housing 2 by the pivot 13 for fulcrum, the aiming bolt 14 for vertical adjustment, and the aiming bolt 15 for left and right adjustment. The heat sink 167 is provided on the back surface of the support substrate 165, the light emitting element 166, and the heat source side heat diffusion plate 162. The optical unit 16 may be attached to the housing 2 via a bracket, like the optical unit 6.

  As shown in FIG. 9B, the curved leading end 162a of the heat source side heat diffusion plate 162 is curved in an arc shape. On the other hand, another connecting member 164 is slidably connected to the housing-side heat diffusion plate 63, and the curved tip end portion 164a of the connecting member 164 is also curved in an arc shape. The curved leading end 162a of the heat source side heat diffusion plate 162 and the curved leading end 164a of the connecting member 164 are connected at the upper part of the step at the bottom of the housing 2. In this case, the curved leading end 162a of the heat source side heat diffusion plate 162 is inscribed in the curved leading end 162a of the heat source side heat diffusion plate 162. As a result, the upper part of the heat source side heat diffusion plate 162 is fixed to the housing 2 by the pivot 13 for fulcrum, the left and right adjustment aiming bolt 15 and the connecting member 164, while the lower part is fixed to the housing 2 by the aiming 14 for vertical adjustment. Therefore, even when the vehicle is running, the heat source side heat diffusion plate 62 is not separated from the housing 2 due to vibration, impact, or the like. As a result, the heat-source-side heat diffusion plate 162 can be rotated about the curved tip 162a as a central axis, and can also be rotated with respect to the housing-side heat diffusion plate 63 via the connection member 164, thereby exhibiting an aiming function. .

  A heat conductive material (TIM) (not shown) such as heat conductive grease is filled between the curved front end 162a of the heat source side heat diffusion plate 162 and the curved front end 164a of the connecting member 164. In this way, the heat generated in the light emitting element 166 is transmitted from the heat source side heat diffusion plate 162 to the connection member 164 and the case side heat diffusion plate 63 via the curved tip portion 162a on the housing 2 and the curved tip portion 164a of the connection member 164. Therefore, the heat radiation performance can be improved because the heat is efficiently radiated without any heat conduction loss.

  The heat source side heat diffusion plate 162 and the connection member 164 are also made of the same material as the heat source side heat diffusion plate 62 and the connection member 64.

  In addition, as described above, the space between the curved tip 162a of the heat source side heat diffusion plate 162 and the connecting member 164 is filled with a heat conductive material (TIM). Instead, a thixotropic material is used. It may be filled.

  The vertical aiming operation of the heat source side heat diffusion plate 162 of FIG. 9 will be described. By tightening the up / down adjustment aiming bolt 14, the heat source side heat diffusion plate 162 of the optical unit 16 rotates counterclockwise around the curved front end 162 a at the upper part of the step of the housing 2. As a result, the optical axis of the light emitting element 166 is adjusted downward. On the other hand, by loosening the vertical adjustment aiming bolt 14, the heat source side heat diffusing plate 162 of the optical unit 16 rotates clockwise around the curved tip 162 a at the upper part of the step of the housing 2. As a result, the optical axis of the light emitting element 166 is adjusted upward. The heat source side heat diffusing plate 162 and the connecting member 164 are designed so that the optical axis of the light emitting element 166 can move within a range of ± 5 ° up and down from the center position.

  The horizontal aiming operation of the heat source side heat diffusion plate 162 in FIG. 9 will be described. By loosening the left and right adjustment aiming bolt 15, the heat source side heat diffusion plate 162 of the optical unit 16 rotates clockwise with the fulcrum pivot 13 as the center axis. As a result, the optical axis of the light emitting element 166 is adjusted to the right. On the other hand, by tightening the left and right adjustment aiming bolts 15, the heat source side heat diffusion plate 162 of the optical unit 16 rotates counterclockwise as viewed from above with the fulcrum pivot 13 as the central axis. As a result, the optical axis of the light emitting element 166 is adjusted to the left. In this case as well, the heat source side heat diffusion plate 162 and the connection member 164 are designed such that the optical axis of the light emitting element 166 can move within a range of ± 5 ° to the left and right of the center position.

  Similarly to the connection member 64, the connection member 164 has a semicircular or trapezoidal plate shape. On the other hand, in order to accommodate the connection member 164 and to ensure the movable range of the connection member 164, a semicircular, trapezoidal, or rectangular shape is provided on the heat source side heat diffusion plate 162 side of the back surface of the housing side heat diffusion plate 63. A recess is formed. However, the shape of the concave portion of the housing-side heat diffusion plate 63 and the shape of the connection member 164 can be appropriately changed as long as the connection member 164 is movable. At this time, a heat conductive material (TIM) such as heat conduction grease is filled between the case side heat diffusion plate 63 and the connection member 164 so that the case side heat diffusion plate 63 and the connection member 164 can be lubricated. The Also in this case, a line slit (not shown) for filling the heat conductive material (TIM) is provided in the concave portion of the housing side heat diffusion plate 63. However, the line slit may be a concentric arc slit, a dot-like uneven structure, or a combination thereof.

  Furthermore, a slit can be provided in the lower part of the heat source side heat diffusion plate 162 of FIG. Thereby, the low temperature air in front of the heat source side heat diffusion plate 162 is naturally convected to the heat sink 167 side to enhance the cooling effect. Also in this case, pressure loss is reduced by processing the slit into a three-dimensional crease slit by alternately repeating mountain folds and valley folds, and the cooling effect by natural convection can be further enhanced. In this case, the height of the heat source side heat diffusion plate 162 can also be reduced, so that the optical unit 16 can be reduced in size.

  In the above-described embodiment, the housing-side heat diffusion plate 63 is configured as a separate component from the housing 2 and is attached to the housing 2. However, even if the housing-side heat diffusion plate 63 is molded integrally with the housing 2, Good. As a result, the efficiency of the assembly work can be increased, and furthermore, the contact thermal resistance between the housing-side heat diffusion plate 63 and the housing 2 can be reduced, and therefore the heat dissipation effect can be enhanced.

  In the above-described embodiment, another housing-side heat diffusion plate may be provided on the outer surface of the housing 2 so as to face the housing-side heat diffusion plate 63. That is, the housing 2 is sandwiched between the two housing side heat diffusion plates. Thereby, the amount of heat passing from the inside of the housing 2 to the outside can be increased to improve the heat dissipation performance.

FIG. 10 is a table showing the weight of the optical unit of the vehicular lamp according to the present invention. In FIG. 10, the weight was calculated under the following conditions.
Heat generation amount of light emitting element: 20W
Case (outer lens, housing) size: length 200mm x width 200mm x height 225mm
Ambient temperature: 90 ° C
When a conventional optical unit is configured in which the curved surface portion of the base of the light emitting device and the curved surface portion of the housing are in surface contact so that the temperature of the light emitting device is 160 ° C., the weight of the optical unit is 255 g due to the large heat sink. there were. On the other hand, when the optical unit shown in FIGS. 1 to 5 was configured so that the temperature of the light emitting element was 160 ° C., the weight of the optical unit was 190 g. Further, the weight of the optical unit shown in FIG. 7 is a little heavier than 198 g because the casing-side heat diffusion plate 63 ′ is heavier. Further, the weight of the optical unit in FIG. 8 is increased to 208 g by the heat sink 68. In either case, it was lighter than the conventional optical unit. Therefore, it was found that the heat dissipation performance in the same envelope volume is improved in the optical unit according to the present invention than in the conventional optical unit.

  FIG. 11 is a table showing the temperature in the vicinity of the light emitting element due to the aiming operation of the vehicular lamp according to the present invention. As shown in FIG. 11, the temperature in the vicinity of the light emitting element 66 hardly changed even by the aiming operation of the optical unit of the vehicular lamp of FIGS. 1 to 5, 7, and 8. That is, the contact thermal resistance due to the aiming operation hardly changed, and there was no temperature dependency of the optical axis of the light emitting element 66, and the heat radiation performance could be improved.

  The present invention can be applied to any change in the obvious range of the above-described embodiment.

  The vehicular lamp according to the present invention can be applied to fog lamps and DRL (Daytime Running Lamps) in addition to the headlamp.

1: Outer lens 2: Housing 2a: Recess 13: Pivoting pivot 4, 14: Up / down adjustment aiming bolt 5, 15: Left / right adjustment aiming bolt 6, 16: Optical unit 61: Brackets 61a, 61b: Fixing bolts 62, 62 ', 162: heat source side heat diffusion plate 62a, 162a: curved tip 62b: slit 62b': crease slit 63: housing side heat diffusion plate 63a: recess 63b: line slit 64, 164: connecting member 64a, 164a: curved tip Portions 65, 165: Support substrate 66, 166: Light emitting elements 67, 68, 167: Heat sink

Claims (9)

A housing;
A light emitting element;
A heat source side heat diffusion plate provided with the light emitting element on the surface side;
Aiming bolts for vertical adjustment for fixing the heat source side heat diffusion plate to the housing via a bracket ,
A case-side heat diffusion plate provided on the bottom inner surface of the housing;
A connecting member slidably connected to the housing-side heat diffusion plate ;
The lower end of the heat source side heat diffusing plate is accommodated in a recess in the bottom of the housing, and the upper end of the heat source side heat diffusing plate is moved to the lower end of the bent portion of the heat source side heat diffusing plate by the aiming adjustment bolt. Rotate the part about the center axis ,
A vehicular lamp in which a curved tip end portion of the connecting member is inscribed in the curved tip end portion of the heat source side heat diffusion plate in the concave portion of the housing . further,
Aiming bolt for left and right adjustment for fixing the heat source side heat diffusion plate to the housing via the bracket,
2. The vehicular lamp according to claim 1, wherein the heat source side heat diffusion plate is rotated about a portion opposite to the left and right adjustment aiming bolt as a substantially central axis by the left and right adjustment aiming bolt. 3. The vehicular lamp according to claim 1 or 2 , wherein the concave portion of the housing is filled with a heat conductive material or a thixotropic material. 2. The vehicular lamp according to claim 1 , wherein a recess for accommodating the connection member and securing a movable range of the connection member is formed on a back surface of the housing-side heat diffusion plate. The vehicular lamp according to claim 4 , wherein the concave portion of the housing-side heat diffusion plate is filled with a heat conductive material or a thixotropic material. The vehicular lamp according to claim 5 , wherein a slit for filling a heat conductive material or a thixotropic material is provided in the recess of the housing side heat diffusion plate. The vehicular lamp according to any one of claims 1 to 6 provided with slits for natural convection of air in the heat source-side heat diffusion plate. further,
With other light emitting elements,
Other heat source side heat diffusion plate provided with the other light emitting element on the surface side,
Other connection members slidably connected to the housing side heat diffusion plate ,
Other aiming bolts for vertical adjustment for fixing the lower part of the other heat source side heat diffusion plate to the housing via another bracket,
Another aiming bolt for adjusting the right and left of the other heat source side heat diffusion plate to the housing via the other bracket,
The curved tip of the other connecting member is inscribed in the top of the step at the bottom of the housing with the curved tip of the other heat source side heat diffusion plate, and the other heat source side heat is applied by the other up and down adjustment aiming bolts. The diffusion plate is rotated about the curved tip of the other heat source side heat diffusion plate as a substantially central axis,
2. The vehicular lamp according to claim 1 , wherein the other heat source side heat diffusion plate is rotated about a portion opposite to the other left and right adjustment aiming bolt by the other left and right adjustment aiming bolt.   A housing;
  A light emitting element;
  A heat source side heat diffusion plate provided with the light emitting element on the surface side;
  A vertical optical axis adjusting member and a horizontal optical axis adjusting member for fixing the heat source side heat diffusion plate to the housing via a bracket;
  A case-side heat diffusion plate provided on the inner surface of the housing;
  A connecting member slidably connected to the housing-side heat diffusion plate;
  Comprising
  The curved distal end portion of the edge of the heat source side heat diffusion plate is accommodated in the recess of the housing, and the curved upper end of the heat source side heat diffusion plate in the recess is moved by the upper and lower optical axis adjusting members. Rotate the part about the center axis,
  The heat source side heat diffusing plate is rotated by the left and right optical axis adjusting member as a substantially central axis at a portion opposite to the left and right optical axis adjusting member,
  A vehicular lamp in which a curved tip end portion of the connecting member is inscribed in the curved tip end portion of the heat source side heat diffusion plate in the concave portion of the housing.

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