JP2019033061A - Vehicle lamp fitting - Google Patents

Abstract

To provide a vehicle lamp fitting which can efficiently radiate heat generated by a semiconductor light-emitting element to the outside of a lamp chamber and preferably perform aiming adjustment.SOLUTION: In a vehicle lamp fitting 10, a lamp fitting unit 18 which uses an LED 20 as a light source is housed in a lamp chamber 13 which is formed including an outer lens 12 and a lamp fitting body 11. The vehicle lamp fitting 10 includes: a heat sink 25 which has multiple heat radiation fins 27 and is attached to the lamp fitting body 11 so that the heat radiation fins 27 are exposed to the outside of the lamp chamber 13; an LED support member 21 which supports the LED 20 and is supported in a tiltable manner by the haet sink 25; and a spiral shape heat pipe 40 which connects the LED support member 21 to the heat sink 25.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp that uses a semiconductor light emitting element as a light source.

  2. Description of the Related Art Conventionally, a vehicular lamp using a semiconductor light emitting element such as an LED (Light Emitting Diode) as a light source is known. When a semiconductor light emitting element is used as a light source of a vehicular lamp, it is necessary to satisfy a light quantity level required for the vehicular lamp by making maximum use of light emitted from the semiconductor light emitting element.

  In general, a semiconductor light emitting device generates heat when a large current is supplied in order to obtain a high output. However, when the temperature of the device becomes high due to heat generation, the light emission efficiency decreases. Therefore, various heat dissipation structures for vehicle lamps have been proposed in order to efficiently dissipate heat from the semiconductor light emitting element.

  For example, a heat dissipation structure has been proposed in which a support member for a semiconductor light emitting element and a heat sink exposed to the outside of a lamp chamber composed of an outer lens and a lamp body are connected by a heat pipe (see, for example, Patent Document 1).

JP 2004-31224 A

  In the heat dissipation structure using the heat pipe as described above, the heat generated from the semiconductor light emitting element can be efficiently dissipated outside the lamp chamber through the heat pipe, but when tilting the lamp unit for aiming adjustment, The movement of the lamp unit may be hindered by the heat pipe, and it may be difficult to appropriately perform aiming adjustment.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicular lamp that can efficiently dissipate heat generated from a semiconductor light emitting element to the outside of the lamp chamber and can suitably perform aiming adjustment. There is to do.

  In order to solve the above-described problems, in a vehicle lamp according to an aspect of the present invention, a lamp unit using a semiconductor light emitting element as a light source is housed in a lamp chamber formed including an outer lens and a lamp body. The vehicle lamp includes a heat sink attached to the lamp body so that a part of the lamp is exposed to the outside of the lamp chamber, and a light source support member that supports the semiconductor light emitting element, and is supported by the heat sink so as to be tiltable. A member, and a spiral heat pipe connecting the light source support member and the heat sink.

  The heat pipe may be formed such that the diameter of the spiral changes between the light source support member and the heat sink.

  The heat pipe may be formed such that the pitch of the spiral changes between the light source support member and the heat sink.

  A heat receiving plate fixed to the light source support member and connected to one end of the heat pipe, and a heat radiating plate fixed to the heat sink and connected to the other end of the heat pipe may be further provided.

  The heat sink has a fixing portion for fixing itself to the heat sink, and the fixing portion is located outside the outer edge portion of the heat receiving plate when the heat sink and the heat receiving plate are viewed from the normal direction to the heat sink. Also good.

The fixing portion is provided at the corner of the heat sink, the heat receiving plate and the heat sink are rectangular, the length of the horizontal side of the heat receiving plate is A, the length of the vertical side is B, the length of the horizontal side of the heat sink When the length is A ′ and the length of the vertical side is B ′, the heat receiving plate and the heat radiating plate are
A '> A or B'> B
It may be formed so as to satisfy.

  The heat pipe may include a first heat pipe and a second heat pipe having a spiral diameter smaller than that of the first heat pipe, and the second heat pipe may be disposed inside the first heat pipe.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to thermally radiate the heat | fever generate | occur | produced from the semiconductor light-emitting element outside a lamp chamber, the vehicle lamp which can perform aiming adjustment suitably can be provided.

1 is a schematic cross-sectional view of a vehicular lamp according to an embodiment of the present invention. It is the perspective view which looked at a lamp unit and a heat sink from diagonally forward. It is the perspective view which looked at a lamp unit and a heat sink from diagonally backward. It is a schematic front view which shows the state which attached the heat-transfer unit to the heat sink. It is a figure for demonstrating the conditions of the dimension of a heat receiving plate and a heat sink. It is a schematic sectional drawing of the vehicle lamp which concerns on another embodiment of this invention.

  Hereinafter, a vehicular lamp according to an embodiment of the present invention will be described in detail with reference to the drawings. In the present specification, when terms indicating directions such as “up”, “down”, “front”, “back”, “left”, “right”, “inside”, “outside”, etc. are used, It means the direction in the posture when the vehicular lamp is mounted on the vehicle.

  FIG. 1 is a schematic cross-sectional view of a vehicular lamp 10 according to an embodiment of the present invention. As shown in FIG. 1, the vehicular lamp 10 includes a resin lamp body 11 having an open front surface, and an outer lens 12 that is formed of a translucent material and covers the front surface of the lamp body 11 in an airtight manner. A lamp unit 18 having a semiconductor light emitting element as a light source is accommodated in the lamp chamber 13 configured.

  The lamp unit 18 includes an LED 20 as a light source, an LED support member 21 that supports the LED 20, a projection lens 22 that controls light emitted from the LED 20, and a lens that supports the projection lens 22 in front of the LED 20 (irradiation direction). And a support portion 23. The lamp unit 18 is a so-called direct-type lamp unit that projects direct light from the LED 20 mounted on the front surface 21a of the LED support member 21 using a projection lens. The lamp unit 18 is not limited to the direct-light type, and may be a so-called projector-type lamp unit that reflects light from an LED with a reflector and projects the reflected light with a projection lens.

  The vehicular lamp 10 further includes a heat sink 25 for radiating heat generated from the LEDs 20 to the outside of the lamp chamber 13. The heat sink 25 is formed of a metal having a high thermal conductivity such as aluminum, and includes a flat plate-like base portion 26 and a plurality of flat plate-like heat radiation fins 27 erected on the rear surface 26a of the base portion 26 at a predetermined interval. Become. The shape of the radiation fin 27 is not particularly limited to a flat plate shape, and may be a columnar fin.

  As shown in FIG. 1, the heat sink 25 is attached to the lamp body 11 such that a plurality of radiating fins 27 that are a part of the heat sink 25 are exposed to the outside of the lamp chamber 13. An opening 11b is provided in the rear surface 11a of the lamp body 11, and the heat sink 25 is attached to the rear surface 11a of the lamp body 11 so that the base portion 26 covers the opening 11b in an airtight manner.

  FIG. 2 is a perspective view of the lamp unit 18 and the heat sink 25 as viewed obliquely from the front. FIG. 3 is a perspective view of the lamp unit 18 and the heat sink 25 as viewed obliquely from the rear. As shown in FIGS. 1 to 3, the lamp unit 18 is supported by the aiming mechanism 30 so as to be tiltable in the vertical direction and the horizontal direction with respect to the heat sink 25.

  The aiming mechanism 30 includes a first aiming screw 31, a second aiming screw 32, and a support rod 33 that extend from the front surface 26 b of the base portion 26 of the heat sink 25 to the LED support member 21 of the lamp unit 18. The base end of the first aiming screw 31 is rotatably supported by the upper right portion of the base portion 26 of the heat sink 25 when viewed from the front of the lamp, and the distal end of the first aiming screw 31 is viewed from the front of the lamp. It is screwed into a first aiming nut 34 provided in the portion. The base end of the second aiming screw 32 is rotatably supported by the lower left portion of the base portion 26 of the heat sink 25 when viewed from the front of the lamp, and the distal end of the second aiming screw 32 is viewed from the front of the lamp. It is screwed into a second aiming nut 35 provided in the portion. The support rod 33 is supported at the upper left portion of the base portion 26 of the heat sink 25 as viewed from the front of the lamp, and the distal end of the support rod 33 is provided at the upper left portion of the LED support member 21 as viewed from the front of the lamp. It is attached to the ball joint 36.

  When the first aiming screw 31 is rotated, the LED support member 21 can be tilted in the left-right direction with the ball joint 36 as a fulcrum. Further, when the second aiming screw 32 is rotated, the LED support member 21 can be tilted in the vertical direction with the ball joint 36 as a fulcrum. Thus, the aiming adjustment (optical axis adjustment) of the lamp unit 18 can be performed by tilting the LED support member 21 in the vertical and horizontal directions with respect to the heat sink 25 using the aiming mechanism 30.

  As shown in FIG. 1 thru | or FIG. 3, in the vehicle lamp 10 which concerns on this embodiment, the LED support member 21 in which LED20 is mounted, and the heat sink 25 are spaced apart. In order to transmit heat generated from the LED 20 to the heat sink 25, the vehicular lamp 10 includes a spiral heat pipe 40 that connects the LED support member 21 and the heat sink 25.

  A heat receiving plate 41 for transferring the heat generated from the LEDs 20 to the heat pipe 40 is fixed on the rear surface 21 b of the LED support member 21. The heat receiving plate 41 is a plate-like body made of an aluminum alloy or copper having a high thermal conductivity, and may be nickel-plated as a surface treatment. The end of the heat pipe 40 on the LED support member side is connected to the heat receiving plate 41 by a method with little heat transfer loss such as soldering. In order to ensure the connection of the heat pipe 40 to the heat receiving plate 41, a metal fixing member 42 formed in a semi-cylindrical shape may be used. Further, grease may be applied between the heat pipe 40 and the heat receiving plate 41 in order to improve heat transfer.

  A heat radiating plate 43 for transferring heat from the heat pipe 40 to the heat sink 25 is fixed on the front surface 26 b of the base portion 26 of the heat sink 25. The heat radiating plate 43 is a plate-like body made of an aluminum alloy or copper having a high thermal conductivity, and may be nickel-plated as a surface treatment. The end of the heat pipe 40 on the heat sink side is connected to the heat radiating plate 43 by a method with little heat transfer loss such as soldering. In order to ensure the connection of the heat pipe 40 to the heat radiating plate 43, a metal fixing member 44 formed in a semi-cylindrical shape may be used. Further, grease may be applied between the heat pipe 40 and the heat radiating plate 43 in order to enhance heat transfer.

  In the vehicle lamp 10 according to the present embodiment configured as described above, the heat generated from the LED 20 is transferred to the heat pipe 40 via the LED support member 21 and the heat receiving plate 41. The heat transmitted through the heat pipe 40 is transferred to the heat sink 25 through the heat radiating plate 43 and is radiated to the external space from the heat radiating fins 27 exposed to the outside of the lamp chamber 13. Thereby, the temperature rise of LED20 can be suppressed and the luminous efficiency of LED20 can be improved.

  In the vehicular lamp 10 according to this embodiment, the heat pipe 40 and the heat receiving plate 41 and the heat radiating plate 43 respectively connected to both ends of the heat pipe 40 are “transfer” for transferring the heat generated from the LED 20 to the heat sink 25. "Thermal unit".

  Here, in the vehicular lamp 10 according to the present embodiment, the spiral heat pipe 40 is used. For example, when a linear heat pipe with low flexibility is used, when the lamp unit 18 is tilted vertically and horizontally for aiming adjustment, the movement of the lamp unit 18 is hindered by the heat pipe, and the aiming adjustment is preferably performed. May be difficult to do. The helical heat pipe 40 used in the present embodiment is more flexible than the linear heat pipe, and therefore it is easier to follow the movement of the lamp unit 18 during the aiming adjustment, which is suitable for the aiming adjustment. Can be performed.

  The helical heat pipe 40 is preferably formed so as to be able to follow aiming adjustment of about ± 10 degrees in the vertical direction and the horizontal direction. The followability of the heat pipe 40 can be adjusted by changing the material constituting the heat pipe 40, the diameter and pitch of the spiral.

  In the embodiment shown in FIGS. 1 to 3, the spiral diameter of the heat pipe 40 is constant between the LED support member 21 and the heat sink 25, but the spiral diameter of the heat pipe 40 is between the LED support member 21 and the heat sink 25. It may be formed to change between.

  In the embodiment shown in FIGS. 1 to 3, the helical pitch of the heat pipe 40 is constant between the LED support member 21 and the heat sink 25, but the helical pitch of the heat pipe 40 is the LED support member 21 and the heat sink. It may be formed to vary between 25.

  In the above-described embodiment, one heat pipe 40 is provided between the LED support member 21 and the heat sink 25. However, a plurality of heat pipes 40 may be provided in order to increase the heat dissipation efficiency.

  FIG. 4 is a schematic front view showing a state in which the heat transfer unit 45 is attached to the heat sink 25. The procedure for assembling the lamp unit 18 will be briefly described. First, the heat receiving plate 41 and the heat radiating plate 43 are respectively connected to both ends of the heat pipe 40, and the heat transfer unit 45 is assembled. Thereafter, the heat transfer unit 45 is assembled to the heat sink 25 by fixing the heat radiating plate 43 on the front surface 26 b of the base portion 26 of the heat sink 25. Thereafter, the heat receiving plate 41 is fixed to the rear surface of the LED support member 21 on which the LED 20 is mounted, and the LED support member 21 is connected to the first aiming screw 31 via the first aiming nut 34, the second aiming nut 35 and the ball joint 36. The second aiming screw 32 and the support rod 33 are attached. Thereafter, the projection lens 22 and the lens support portion 23 are mounted on the front surface 21a of the LED support member 21, and the lamp unit 18 is completed.

  The heat radiating plate 43 has a fixing portion 43 a for fixing itself to the base portion 26 of the heat sink 25 at its corner. In the present embodiment, a through hole is formed in the fixing portion 43a, and the fixing portion 43a is fixed to the base portion 26 with a screw (not shown) inserted through the through hole.

  As can be seen from FIG. 4, the fixing portion 43 a of the heat radiating plate 43 is located outside the outer edge portion of the heat receiving plate 41 when the heat radiating plate 43 and the heat receiving plate 41 are viewed from the normal direction to the heat radiating plate 43. . Since the fixing portion 43a of the heat radiating plate 43 is positioned outside the outer edge portion of the heat receiving plate 41 in this manner, the screws for fixing the heat radiating plate 43 to the base portion 26 of the heat sink 25 can be easily tightened. Assembling property of 18 can be improved.

  FIG. 5 is a diagram for explaining the dimensional conditions of the heat receiving plate 41 and the heat radiating plate 43. Here, the heat receiving plate 41 and the heat radiating plate 43 are rectangular, the length of the horizontal side of the heat receiving plate 41 is A, the length of the vertical side is B, the length of the horizontal side of the heat radiating plate 43 is A ′, Let B ′ be the length of the side.

In FIG. 5, four patterns are examined according to the size of the heat receiving plate 41 and the size of the heat radiating plate 43. The four patterns are as follows.
Pattern 1: A ′> A and B ′ <B
Pattern 2: A ′> A and B ′> B
Pattern 3: A ′ <A and B ′ <B
Pattern 4: A ′ <A and B′> B

  As shown in FIG. 5, in the case of pattern 1 (A ′> A and B ′ <B), when the heat radiating plate 43 and the heat receiving plate 41 are viewed from the normal direction to the heat radiating plate 43, the fixing portion of the heat radiating plate 43. 43 a is located outside the outer edge of the heat receiving plate 41. In the case of pattern 2 (A ′> A and B ′> B), when the heat sink 43 and the heat receiving plate 41 are viewed from the normal direction to the heat sink 43, the fixing portion 43a of the heat sink 43 is the heat receiving plate. 41 is located outside the outer edge of 41. In the case of the pattern 4 (A ′ <A and B′> B), when the heat sink 43 and the heat receiving plate 41 are viewed from the normal direction to the heat sink 43, the fixing portion 43a of the heat sink 43 is the heat receiving plate. 41 is located outside the outer edge of 41. On the other hand, in the case of pattern 3 (A ′ <A and B ′ <B), when the heat radiating plate 43 and the heat receiving plate 41 are viewed from the normal direction to the heat radiating plate 43, the entire heat radiating plate 43 is behind the heat receiving plate 41. The fixing portion 43 a of the heat radiating plate 43 is not located outside the outer edge portion of the heat receiving plate 41.

In summary,
A '> A or B'> B
By forming the heat receiving plate 41 and the heat radiating plate 43 so as to satisfy the condition, the fixing portion 43a formed at the corner of the heat radiating plate 43 can be positioned outside the outer edge of the heat receiving plate 41, and the lamp unit 18 Assembling property can be improved.

  FIG. 6 is a schematic cross-sectional view of a vehicular lamp 50 according to another embodiment of the present invention. In the vehicular lamp 50 shown in FIG. 6, the same or corresponding components as those in the vehicular lamp 10 shown in FIG.

  The vehicular lamp 50 according to the present embodiment is different from the vehicular lamp 10 shown in FIG. 1 in that the vehicular lamp 50 includes two spiral heat pipes (a first heat pipe 51 and a second heat pipe 52). The second heat pipe 52 has a smaller spiral diameter than the first heat pipe 51. The second heat pipe 52 is arranged inside the first heat pipe 51 as shown in FIG. Both ends of the first heat pipe 51 and the second heat pipe 52 are connected to the heat receiving plate 41 and the heat radiating plate 43, respectively.

  By using two spiral heat pipes in this way, the amount of heat transport increases as compared to the case of a single heat pipe such as the vehicular lamp 10 shown in FIG. Can do. The two heat pipes may have different diameters depending on the required heat transport amount.

  Moreover, in this embodiment, since it has taken the structure which arrange | positions the 2nd heat pipe 52 with a small helical diameter inside the 1st heat pipe 51 with a large helical diameter, for example, when arranging two heat pipes side by side In comparison, space can be saved.

  The present invention has been described above based on the embodiment. It should be understood by those skilled in the art that these embodiments are exemplifications, and that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention.

  DESCRIPTION OF SYMBOLS 10,50 Vehicle lamp, 11 Lamp body, 13 Lamp chamber, 18 Lamp unit, 20 LED, 21 LED support member, 22 Projection lens, 23 Lens support part, 25 Heat sink, 26 Base part, 27 Radiation fin, 30 Aiming mechanism , 31 first aiming screw, 32 second aiming screw, 33 support rod, 36 ball joint, 40 heat pipe, 41 heat receiving plate, 43 heat radiating plate, 45 heat transfer unit, 51 first heat pipe, 52 second heat pipe.

Claims (7)

A vehicular lamp in which a lamp unit using a semiconductor light emitting element as a light source is housed in a lamp chamber formed including an outer lens and a lamp body,
A heat sink attached to the lamp body such that a portion is exposed to the outside of the lamp chamber;
A light source support member for supporting the semiconductor light emitting element, wherein the light source support member is tiltably supported by the heat sink;
A helical heat pipe connecting the light source support member and the heat sink;
A vehicular lamp characterized by comprising:   2. The vehicular lamp according to claim 1, wherein the heat pipe is formed such that a spiral diameter changes between the light source support member and the heat sink. 3.   3. The vehicular lamp according to claim 1, wherein the heat pipe is formed such that a helical pitch changes between the light source support member and the heat sink. 4. A heat receiving plate fixed to the light source support member and connected to one end of the heat pipe;
A heat sink fixed to the heat sink and connected to the other end of the heat pipe;
The vehicular lamp according to claim 1, further comprising: The heat radiating plate includes a fixing portion for fixing itself to the heat sink,
5. The vehicle according to claim 4, wherein the fixing portion is located outside an outer edge portion of the heat receiving plate when the heat radiating plate and the heat receiving plate are viewed from a normal direction to the heat radiating plate. Light fixture. The fixed portion is provided at a corner of the heat sink,
The heat receiving plate and the heat radiating plate are rectangular,
When the length of the horizontal side of the heat receiving plate is A, the length of the vertical side is B, the length of the horizontal side of the heat sink is A ′, and the length of the vertical side is B ′, the heat receiving plate and The heat sink is
A '> A or B'> B
The vehicular lamp according to claim 5, wherein the vehicular lamp is formed so as to satisfy the above. The heat pipe includes a first heat pipe and a second heat pipe having a smaller spiral diameter than the first heat pipe,
The vehicular lamp according to any one of claims 1 to 6, wherein the second heat pipe is disposed inside the first heat pipe.

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