JP4345517B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp using an LED such as a headlamp as a light source. Specifically, the present invention relates to a vehicular lamp provided with an LED cooling structure.

  Conventionally, this type of vehicle lamp is known (for example, Patent Document 1 and Patent Document 2). Hereinafter, the vehicle lamp will be described. Reference numerals in parentheses correspond to Patent Document 1 and Patent Document 2, respectively. The vehicular lamp of Patent Document 1 includes a case (5) that partitions a lamp chamber, a lamp unit that uses an LED (12) as a light source, and a heat sink (14) that is provided on the circuit board (11) of the LED (12). The circuit board (11) is directly attached to the case (5), the LED (12) is accommodated in the case (5), and the heat sink (14) is exposed to the outside. On the other hand, the vehicular lamp of Patent Document 2 includes a main body case (8) and a cover (9) and an outer lens (6) that define a lamp chamber, a lamp unit using an LED (2) as a light source, and the LED ( A heat sink (4) provided on the light source substrate (3) of 2), the light source substrate (3) is directly attached to the cover portion (9), the LED (2) is accommodated in the lamp chamber, and The heat sink (4) is exposed to the outside.

  The vehicle lamp of Patent Document 1 and the vehicle lamp of Patent Document 2 dissipate (release) the heat generated when the LEDs (12) and (2) are turned on to the outside through the heat sinks (14) and (4). Thus, the environmental temperature of the LEDs (12) and (2) can be kept low. As a result, the vehicular lamp of Patent Document 1 and the vehicular lamp of Patent Document 2 have the LEDs (12) and (2) whose light-emitting performance tends to decrease due to an increase in environmental temperature, in a stable state with high light-emitting performance. Can be used as

  However, in the vehicular lamp of Patent Document 1 and the vehicular lamp of Patent Document 2, the circuit board (11) of the LEDs (12) and (2), the light source board (3) are the case (5), and the cover portion (9). In other words, the circuit board (11) and the light source board (3) are fixed to the case (5) and the cover part (9). For this purpose, the vehicle lamp of Patent Document 1 and the vehicle lamp of Patent Document 2 rotate the circuit board (11) and the light source board (3) with respect to the case (5) and the cover part (9) to produce an LED. It is impossible to adjust the optical axes of (12) and (2). However, it is possible to adjust the optical axes of the LEDs (12) and (2) by installing the vehicle lamp of Patent Document 1 and the entire vehicle lamp of Patent Document 2 so that the optical axis can be adjusted with respect to the vehicle. However, in this case, there is a problem that the optical axis adjusting mechanism becomes large and expensive.

JP 2002-163912 A JP 2003-30785 A

  The problem to be solved by the present invention is that, in a conventional vehicular lamp, the lamp unit using an LED as a light source can be optically adjusted by a small and inexpensive optical axis adjusting mechanism while efficiently cooling the lamp chamber. It is in the impossible.

The present invention (the invention according to claim 1), mounted for optical axis adjustment in the lamp housing a lamp unit for a LED as a light source through the mounting bracket and the optical axis adjustment mechanism and the pivot mechanism of the thermal conductivity is high material, A cooling means is arranged outside the lamp chamber, one end of the sheet-like flexible heat conducting means is sandwiched and fixed between the mounting bracket and the first mounting plate, and the other end of the sheet-like flexible heat conducting means is cooled. And being fixed between the second mounting plate and the second mounting plate .

In addition, the present invention (the invention according to claim 2) is characterized in that the connecting portion between the cooling means and the other end of the sheet-like flexible heat conducting means is located closer to the pivot mechanism than the optical axis adjusting mechanism. And

Further, the present invention (the invention according to claim 3) is characterized in that an air passage is provided in the traveling direction of the vehicle at least in a portion of the cooling means exposed to the outside.

The vehicular lamp according to the present invention (the invention according to claim 1) can adjust the optical axis of a lamp unit using an LED as a light source by means for solving the above-described problems. In addition, the optical axis of the vehicular lamp is not adjustable with respect to the vehicle, but the lamp unit using an LED as a light source can be adjusted with respect to the lamp housing. There is no risk of high costs. Furthermore, the mounting bracket made of a material having a high thermal conductivity between the lamp unit and the cooling means, and the heat conduction action of the sheet-like flexible heat conduction means and the cooling action of the cooling means outside the lamp room, the LED is turned on. The generated heat can be efficiently dissipated outside the lamp chamber through the lamp unit, the mounting bracket made of a material having high thermal conductivity, and the flexible heat conducting means and the cooling means in the form of a sheet . Thereby, even if it arrange | positions LED so that an optical axis can be adjusted in a lamp chamber, the environmental temperature of LED in a lamp chamber can be kept low, and LED can be used as a light source in the stable state with high light emission performance. In addition, due to the flexible action of the flexible heat conducting means in the form of a sheet between the lamp unit and the cooling means, a displacement that occurs during the optical axis adjustment, which is the moving side LED and lamp unit, and the fixed side cooling Since the displacement with respect to the means can be absorbed sufficiently and reliably, the optical axis of the LED can be adjusted smoothly.

The vehicular lamp of the present invention (the invention according to claim 2) is cooled by the means for solving the above-mentioned problem at the other end of the sheet-like flexible heat conducting means when adjusting the optical axis. When the portion in the vicinity of the fixing portion with the means rotates with respect to the pivot mechanism, the amount of rotation is small, and accordingly, the play allowance (flexure allowance) of the sheet-like flexible heat conduction means is small. . Therefore, the length of the sheet-like flexible heat conducting means can be shortened, and there is no interference with other parts.

Further, in the vehicle lamp of the present invention (the invention according to claim 3), since the air passes through the air passage when the vehicle travels, the cooling effect of the cooling means is achieved by the means for solving the above problems. Is improved.

  Embodiments of a vehicular lamp according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  Hereinafter, the configuration of the vehicular lamp in this embodiment will be described. In the figure, reference numeral 1 denotes a vehicle lamp in this embodiment, which is a headlamp. The headlamp 1 includes at least a lamp housing 3 and a lamp lens 4 that define a lamp chamber 2.

  In the lamp chamber 2, a plurality of, in this example, ten lamp units 5 are arranged so that the optical axis can be adjusted. The lamp unit 5 is a small projector-type lamp unit, and includes a reflector, a shade, a lens, and an LED 6 as a light source. That is, the lamp unit 5 uses the LED 6 as a light source. The ten lamp units 5 are respectively attached to the main mounting bracket 8 via the sub mounting bracket 7. The sub mounting bracket 7 and the main mounting bracket 8 are made of a material having high thermal conductivity, for example, aluminum. The sub mounting bracket 7 has an angle shape, while the main mounting bracket 8 has a staircase shape. The one lamp unit 5 is attached to one end of the one sub-mounting bracket 7. The other end portions of the ten sub-mounting brackets 7 are respectively mounted on the main mounting bracket 8 via a first mounting plate 9 and mounting screws 10. As a result, the ten lamp units 5 are respectively attached to the main mounting bracket 8 via the ten sub-mounting brackets 7.

  The ten lamp units 5 are mounted on the lamp housing 3 via the sub mounting bracket 7 and the main mounting bracket 8 so that the optical axis can be adjusted vertically and horizontally. That is, a pivot mechanism 11, a vertical optical axis adjustment mechanism 12, and a horizontal optical axis adjustment mechanism 13 are provided between the lamp housing 3 and the main mounting bracket 8, respectively. The pivot mechanism 11 is disposed at the lower right as viewed from the front of FIG. 2, and the vertical optical axis adjusting mechanism 12 is also disposed at the upper right as viewed from the front of FIG. Similarly, the direction optical axis adjustment mechanism 13 is arranged in the lower right as viewed from the front of FIG. The pivot mechanism 11 includes a ball portion 14 provided in the lamp housing 3 and a screw portion 15 screwed into the main mounting bracket 8. As shown in FIG. 1, the vertical optical axis adjusting mechanism 12 includes an aiming screw 16 provided in the lamp housing 3 and a mount provided in the main mounting bracket 8 and into which the aiming screw 14 is screwed. 17. Although the optical axis adjustment mechanism 13 in the left-right direction is not shown, it is configured with an aiming screw and a mount, similar to the optical axis adjustment mechanism 12 in the vertical direction.

  The optical axis adjustment mechanism 12 in the vertical direction is manually adjusted to connect the ten lamp units 5 to a substantially horizontal axis that connects the center of the optical axis adjustment mechanism 13 in the horizontal direction and the center of the pivot mechanism 11 (see FIG. The optical axis of each of the ten lamp units 5 is manually adjusted by rotating in the vertical direction around (not shown). On the other hand, the optical axis adjustment mechanism 13 in the left-right direction is manually adjusted to connect the ten lamp units 5 to a substantially vertical axis that connects the center of the optical axis adjustment mechanism 12 in the vertical direction and the center of the pivot mechanism 11. The optical axis of each of the ten lamp units 5 is manually adjusted by rotating in the horizontal direction (not shown). The vertical axis adjusting mechanism 12 in the vertical direction may be an automatic optical axis adjusting mechanism (auto leveler).

  A cooling means 18 is attached to the lamp housing 3 via a second mounting plate 19 and a mounting bolt nut 20. The cooling means 18 is positioned on the lower side of the lamp housing 3, in the vicinity of the pivot mechanism 11, and outside the lamp chamber 2. The cooling means 18 is made of a material having high thermal conductivity, for example, aluminum, and has a plurality of fin structures arranged in parallel in the traveling direction of the vehicle. As a result, at least a portion of the cooling means 18 exposed to the outside is provided with an air passage 21 in the traveling direction of the vehicle.

A flexible heat conducting means 22 is connected between the main mounting bracket 8 on the lamp unit 5 side and the cooling means 18 . The flexible heat conducting means 22 is made of a material having high flexibility and high heat conductivity, for example, sheet-like graphite, aluminum, copper or the like. One end of the flexible heat conducting means 22 is sandwiched and fixed between the main mounting bracket 8 and the first mounting plate 9. On the other hand, the other end of the flexible heat conducting means 22 is sandwiched and fixed together between the cooling means 18 and the second mounting plate 19.

  The flexible heat conducting means 22 having one end fixed to the upper lamp unit 5 has the longest length and is located on the rearmost side (the lamp housing 3 side). Further, the flexible heat conducting means 22 having one end fixed to the lamp unit 5 in the middle stage has a middle length and is located in the middle. Further, the flexible heat conducting means 22 having one end fixed to the lamp unit 5 at the lower stage is the shortest and is located on the foremost side (the lamp lens 4 side). The other end of the three flexible heat conducting means 22 is fixed to the cooling means 18. A connecting and fixing portion between the cooling means 18 and the flexible heat conducting means 22 is located in the vicinity of the pivot mechanism 11.

  Hereinafter, the operation of the vehicle lamp in this embodiment will be described. First, the LEDs 6 of the light sources of the ten lamp units 5 are caused to emit light. Then, the light from the LED 6 passes through the lamp lens 4 from each of the ten lamp units 5 to illuminate an external road or the like with a predetermined light distribution pattern.

  By causing the LED 6 to emit light, heat is generated in the LED 6. Then, the heat is transmitted from the ten LEDs 6 to the cooling means 18 through the sub-mounting bracket 7, the main mounting bracket 8 and the flexible heat conducting means 22. The heat transmitted to the cooling means 18 is dissipated outside by the air passing through the air passage 21 of the cooling means 18.

  When the aiming screw 16 of the optical axis adjusting mechanism 12 in the vertical direction is manually adjusted, the optical axes of the ten lamp units 5 are vertically moved around the horizontal axis via the main mounting bracket 8 and the sub mounting bracket 7. Each is adjusted. On the other hand, when the aiming screw of the optical axis adjustment mechanism 13 in the left / right direction is manually adjusted, the optical axes of the ten lamp units 5 are moved in the left / right direction around the vertical axis via the main mounting bracket 8 and the sub mounting bracket 7. Adjusted respectively.

  Hereinafter, effects of the vehicular lamp in this embodiment will be described. The headlamp 1 of the vehicle lamp in this embodiment includes a lamp unit 5 having an LED 6 as a light source in a lamp chamber 2, a pivot mechanism 11, a vertical optical axis adjustment mechanism 12, and a horizontal optical axis adjustment mechanism 13. Therefore, it is possible to adjust the optical axis of the lamp unit 5 using the LED 6 as a light source.

  Moreover, the headlamp 1 of the vehicular lamp in this embodiment does not allow the optical axis of the entire vehicular lamp to be adjusted with respect to the vehicle, but the lamp unit 5 having the LED 6 as a light source is used as a light for the lamp housing 3. Since the axis can be adjusted, there is no risk of an increase in the size or cost of the optical axis adjusting mechanism.

  Further, the headlamp 1 of the vehicular lamp in this embodiment has a cooling means 18 disposed outside the lamp chamber 2 and a flexible heat conducting means 22 is connected between the lamp unit 5 and the cooling means 18. Therefore, in the headlamp 1 of the vehicle lamp in this embodiment, the heat conduction action of the flexible heat conduction means 22 between the lamp unit 5 and the cooling means 18 and the cooling action of the cooling means 18 outside the lamp chamber 2 are achieved. Thus, the heat generated when the LED 6 is turned on can be efficiently dissipated outside the lamp chamber 2 through the lamp unit 5, the sub mounting bracket 7, the main mounting bracket 8, the flexible heat conducting means 22 and the cooling means 18. . Thereby, the headlamp 1 of the vehicle lamp in this embodiment can keep the environmental temperature of the LED 6 in the lamp chamber 2 low even if the LED 6 is arranged in the lamp chamber 2 so that the optical axis can be adjusted. Can be used as a light source in a stable state with high luminous performance.

  Moreover, the headlamp 1 of the vehicular lamp in this embodiment is a displacement generated at the time of optical axis adjustment due to the flexible action of the flexible heat conducting means 22 between the lamp unit 5 and the cooling means 18, and is moved. Since the displacement between the LED 6 and the lamp unit 5 on the side and the cooling means 18 on the fixed side can be absorbed sufficiently and reliably, the optical axis of the LED 6 can be adjusted smoothly.

  In particular, the headlamp 1 of the vehicular lamp in this embodiment is located at the other end of the flexible heat conducting means 22 and fixed to the cooling means 18 in the vicinity of the pivot mechanism 11. For this reason, the headlamp 1 of the vehicle lamp in this embodiment is such that the other end of the flexible heat conducting means 22 and the portion in the vicinity of the fixing place with the cooling means 18 are in contrast to the pivot mechanism 11 when adjusting the optical axis. Therefore, the amount of rotation of the flexible heat conducting means 22 can be reduced by that amount. Therefore, the headlamp 1 of the vehicular lamp in this embodiment can shorten the length of the flexible heat conducting means 22, and there is no interference with other parts.

  Further, in the headlamp 1 of the vehicle lamp in this embodiment, at least a portion of the cooling means 18 exposed to the outside has a fin shape, and an air passage 21 is provided in the traveling direction of the vehicle. For this reason, in the headlamp 1 of the vehicle lamp in this embodiment, since the air passes through the air passage 21 when the vehicle is traveling, the cooling effect of the cooling means 18 is improved.

  Further, in the headlamp 1 of the vehicular lamp in this embodiment, the flexible heat conducting means 22 forms a sheet, so that the flexibility is improved, and the optical axis of the lamp unit 5 can be adjusted smoothly accordingly. .

  In the above embodiment, the headlamp 1 has been described as a vehicular lamp. However, the present invention can be applied to a vehicular lamp other than the headlamp 1.

  In the above-described embodiment, the cooling means 18, the sub mounting bracket 7 and the main mounting bracket 8 are made of a material having high thermal conductivity, for example, aluminum. However, in the present invention, a material other than aluminum, for example, copper or silver, or a plated product such as aluminum, copper, or silver may be used.

  Further, in the above embodiment, the flexible heat conducting means 22 is composed of a flexible flat plate heat sink made of graphite. However, in the present invention, as long as the heat conduction means is flexible, the shape may be a tube shape, or a heat pipe may be used.

  Furthermore, in the above-described embodiment, the vertical optical axis adjustment mechanism 12 and the horizontal optical axis adjustment mechanism 13 are provided. However, in the present invention, either one of the vertical optical axis adjustment mechanism 12 or the horizontal optical axis adjustment mechanism 13 (particularly, the vertical optical axis adjustment mechanism 12) may be provided.

It is a longitudinal cross-sectional view which shows the Example of the vehicle lamp concerning this invention. Similarly, it is a front view of a state excluding the lamp lens, and is a view taken in the direction of arrow II in FIG. Similarly, it is a rear view of the state where the lamp housing is removed, and is a view taken along arrow III in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Headlamp 2 Lamp chamber 3 Lamp housing 4 Lamp lens 5 Lamp unit 6 LED
7 Sub-mounting bracket 8 Main mounting bracket 9 First mounting plate 10 Mounting screw 11 Pivot mechanism 12 Vertical optical axis adjustment mechanism 13 Horizontal optical axis adjustment mechanism 14 Ball portion 15 Screw portion 16 Aiming screw 17 Mount 18 Cooling means 19 Second mounting plate 20 Mounting bolt nut 21 Air passage 22 Flexible heat conduction means

Claims (3)

In a vehicular lamp using an LED as a light source,
A lamp housing and a lamp lens that partition the lamp chamber;
A lamp unit having the LED as a light source disposed in the lamp chamber so that the optical axis can be adjusted;
A mounting bracket made of a material having a high thermal conductivity, which is attached to the lamp unit;
An optical axis adjusting mechanism and a pivot mechanism which are provided between the lamp housing and the mounting bracket and adjust the optical axis of the lamp unit;
Cooling means arranged outside the lamp chamber;
Flexible heat conducting means in the form of a sheet connected between the lamp unit and the cooling means;
Equipped with a,
One end of the sheet-like flexible heat conducting means is sandwiched and fixed between the mounting bracket and the first mounting plate,
The other end of the flexible heat conducting means forming the sheet form, that is fixed sandwiched in between the cooling means and the second mounting plate,
A vehicular lamp characterized by the above. Connection point between the other end of the flexible heat conducting means forming the sheet and the cooling means is positioned in the pivot mechanism side than the optical axis adjustment mechanism,
The vehicular lamp according to claim 1. The portion exposed to at least the outside of the cooling unit, air passage is provided in the traveling direction of the vehicle,
The vehicular lamp according to claim 1 or 2.

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