JP4605120B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp such as a headlamp, a fog lamp, and a tail lamp mounted on an automobile.

  2. Description of the Related Art Conventionally, there is known a vehicular lamp that can perform light distribution control in which an irradiation direction is swung in a horizontal plane by a swivel device (see Patent Document 1).

  On the other hand, as disclosed in Patent Document 2, a technique for applying a high-intensity white light-emitting diode to a headlamp has been developed, but this high-intensity light-emitting diode has a large amount of heat generation, If the temperature raised by the heat generation is not lowered appropriately, the luminous flux of the light source may be reduced or the emission color may be changed, so that the head lamp may not function properly.

Therefore, Patent Document 2 and Patent Document 3 disclose a technique for dissipating heat generated from such a light emitting diode by means of a heat radiating fin or a heat pipe.
JP 2006-164743 A JP 2004-31224 A JP 2002-93206 A

  However, in the vehicular lamp provided with the swivel device as disclosed in Patent Document 1 described above, the motor becomes large unless the movable portion that is swung by the driving force of the motor is reduced in weight. The structure which makes the thermal radiation part provided in a part as light as possible is desired.

  Therefore, an object of the present invention is to provide a vehicular lamp that can sufficiently suppress the temperature rise of a semiconductor light source even if the heat dissipating fin portion provided in the movable portion is lightened.

In order to achieve the above object, a vehicular lamp according to the present invention is a vehicular lamp that includes a swivel mechanism that swings an irradiation direction of light emitted from a semiconductor-type light source, and includes a heat sink to which the semiconductor-type light source is attached. parts includes a heat dissipating fin portion which is formed adjacent to the semiconductor-type light source, have a the rotation axis of the swivel mechanism the working fluid is sealed, which is connected to the heat radiation fin part, the heat radiating fin portion A plurality of plate portions are formed at intervals, and the rotating shaft is attached to a portion where the plate portions are cut out .

  Here, a second radiation fin portion can be formed on the bearing side of the rotating shaft.

  In the vehicular lamp of the present invention configured as described above, a heat sink is directly attached to a semiconductor light source that generates heat when light is output, and the heat sink is adjacent to the semiconductor light source in the heat sink. The part is formed. And the rotating shaft of the swivel mechanism with which the working fluid was enclosed is connected to this radiation fin part.

  In other words, the heat generated by the semiconductor light source is radiated from the heat radiating fin portion and is also transported away from the heat source by the rotating shaft to be radiated. Therefore, even if the heat radiating fin portion is reduced in size and weight, the temperature of the semiconductor light source The rise can be suppressed.

  For this reason, a motor can also be reduced in size, installation space can be secured easily, and power consumption can be suppressed.

  Moreover, heat dissipation performance can be improved by providing a heat radiating fin part also in the bearing part of a rotating shaft.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a cross section in the vehicle front-rear direction of a light source unit 10 arranged in a headlamp as a vehicle lamp according to the present embodiment, and FIG. 2 is an exploded perspective view.

  In such a headlamp of this embodiment, one or more light source units 10 that can swing the irradiation direction in a horizontal plane by a swivel mechanism are arranged on the left and right sides of the vehicle so that light distribution can be controlled. It is configured.

  For example, although not shown in the drawings, the light source unit 10 is used for a light source unit that is arranged in the middle of three stages in the vertical direction for the low beam and the high beam.

  The light source unit 10 radiates heat from the LED 1, the LED 1 as a semiconductor light source, the reflector 3 that houses the LED 1 in the rear lower surface opening 31, the convex lens 4 that is disposed in the front opening of the reflector 3, and the LED 1. It is mainly composed of a heat sink portion 2 and a motor 5 for applying a driving force for swinging the entire reflector 3.

  The LED 1 is a white light-emitting diode having a light-emitting chip, and heat is generated because an energization current increases in order to output high-luminance light. When the temperature of the LED 1 rises due to this heat generation, the luminance decreases or the emission color changes. Therefore, in order to suppress the temperature rise, the heat sink portions 2 described later are individually provided.

  Further, the LED 1 is disposed on the lower surface opening 31 of the reflector 3 in a state where the LED 1 is installed on the substrate 11 having thermal conductivity.

  That is, the reflector 3 is provided with the LED 1 in the vicinity of the first focal point of the reflection surface formed as a spheroid curved surface or a free curved surface based on the spheroid, with the light emitting part facing each other, and the lower surface opening. The light generated from the LED 1 installed in the section 31 is reflected by the reflecting surface and is irradiated on the back surface of the convex lens 4 on the vehicle front side.

  Then, the light incident from the back surface of the convex lens 4 is emitted toward the front of the vehicle, and the light passing through the translucent cover (not shown) illuminates the outside.

  Further, the tip of the motor shaft 51 of the motor 5 is joined to the upper surface of the reflector 3, and the motor shaft 51 is rotated when the motor 5 is driven, and the reflector 3 is also rotated accordingly. .

  On the other hand, the substrate 11 of the LED 1 is attached to the heat sink 2 for heat dissipation for suppressing the temperature rise of the LED 1.

  The heat sink part 2 is mainly composed of a rotating shaft 21 whose axial direction coincides with the motor shaft 51 and a radiation fin part 22.

  As shown in FIGS. 1 and 2, the heat radiating fin portion 22 is formed by a plurality of plate portions 222,... That are suspended at intervals, and a connecting portion 221 that connects them on the upper side. .

  As such a radiating fin portion 22, a surface of copper, copper alloy or the like having excellent heat radiating properties and subjected to corrosion prevention treatment can be used.

  And the board | substrate 11 of LED1 is attached to the upper surface of the radiation fin part 22 exposed to the lower surface opening part 31 of the reflector 3. FIG.

  Further, the cylindrical rotating shaft 21 is attached to the heat radiating fin portion 22 on the extension line in the axial direction of the motor shaft 51 by notching the plate portion 222.

  The rotary shaft 21 is formed with a hollow portion 211 having a cylindrical inside. The hollow portion 211 is decompressed and filled with a working fluid, and heat is transported by a heat transfer law when the working fluid expands and contracts. Is done efficiently.

  For example, by disposing a capillary structure wick along the inner periphery of the rotating shaft 21, the upper working fluid evaporates due to heat input from the connecting portion 221, and the LED 1 is separated from the LED 1 while absorbing latent heat. It moves to the lower bearing portion 6 (see FIG. 1).

  Then, on the side of the bearing portion 6 that is the low temperature portion of the rotating shaft 21, heat is radiated from the tube wall, and the working fluid that has condensed into a liquid by releasing latent heat here again becomes the upper radiating fin portion. Move towards 22.

  Thus, if heat transport is efficiently performed through the rotating shaft 21, the generated heat can be quickly moved away from the LED 1.

  Moreover, water, acetone, ammonia, methanol, mercury, sodium, chlorofluorocarbon, etc. can be used for the working fluid sealed in the rotating shaft 21.

  A second radiating fin portion 61 is formed on the bearing portion 6 of the rotary shaft 21 configured as described above.

  That is, a hole 613 is formed in the central portion 611 of the radiating fin portion 61 having a square shape in plan view, as shown in FIG. 1, and a roller bearing 62 and a thrust bearing 63 are disposed on the bottom surface of the hole 613. And the lower end of the rotating shaft 21 is inserted in the center of the roller bearing 62, and the bearing is formed.

  In addition, the radiating fin portion 61 includes a plurality of horizontally extending plate portions 612,... That are arranged at intervals in the vertical direction, and a center that connects them in the vertical direction to accommodate the lower end of the rotating shaft 21. Part 611.

  Thus, if heat transport is performed by the rotating shaft 21 and heat is radiated by the heat radiating fin portion 61 provided in the bearing portion 6, the portion of the heat radiating capability of the heat radiating fin portion 22 to which the LED 1 is attached can be supplemented. .

  In the headlamp of the present embodiment configured as described above, the heat sink portion 2 is directly attached to each LED 1 that generates heat when outputting light, and the heat sink portion 2 is adjacent to the LED 1 and has a heat radiating fin. A portion 22 is formed. And the upper end of the rotating shaft 21 with which the working fluid was enclosed is connected to this radiation fin part 22. FIG.

  That is, the heat generated in the LED 1 is radiated from the radiating fin portion 22, transported from the upper side to the lower side by the rotating shaft 21, transmitted to the radiating fin portion 61 provided in the bearing portion 6, and radiated to the air. .

  By adopting a configuration in which heat is radiated by the two radiating fin portions 22 and 61 in this way, even if the radiating performance of the radiating fin portion 22 of the movable portion to which the LED 1 is attached is low, the heat radiating fin portion 61 of the bearing portion 6 can compensate. Since it can do, the radiation fin part 22 of a movable part can be reduced in size and reduced in weight.

  Further, if the heat dissipating fin portion 22 is reduced in weight, the motor 5 for swinging the movable portion can also be reduced in size, so that restrictions on component layout are reduced and power consumption is reduced to reduce the load on the battery. it can.

  Furthermore, the heat dissipation fin portion 22 has a higher heat dissipation performance as the volume is larger. However, if the heat dissipation fin portion 22 exceeds a predetermined volume, the heat dissipation fin portion 22 becomes saturated and the heat dissipation performance per volume is reduced. By providing the radiating fin portions 22 and 61 on the upper and lower sides, heat saturation in the radiating fin portion 22 is less likely to occur, and heat can be efficiently radiated even if the amount of heat generated by the LED 1 increases.

  Hereinafter, an example different from the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In this example, a light source unit 10A having a different form from the above embodiment will be described with reference to FIG.

  The light source unit 10A includes an LED 1 as a semiconductor-type light source, a reflector 3A that accommodates the LED 1 in a rear upper surface opening 31A, a heat sink 2A that radiates the LED 1, and a motor 5 that swings the entire reflector 3A. Consists mainly of.

  The LED 1 is disposed on the upper surface opening 31A of the bowl-shaped reflector 3A in a state where the LED 1 is installed on the substrate 11 having thermal conductivity.

  Further, the tip of the motor shaft 51 of the motor 5 is joined to the bottom surface of the reflector 3A. When the motor 5 is driven, the motor shaft 51 rotates, and the reflector 3A rotates accordingly. .

  On the other hand, the substrate 11 of the LED 1 is attached to a heat sink 2A for heat dissipation for suppressing the temperature rise of the LED 1.

  The heat sink portion 2A is mainly composed of a rotating shaft 21A whose axial direction coincides with the motor shaft 51, and a radiation fin portion 22A.

  Further, as shown in FIG. 3, the radiation fin portion 22A is formed by a plurality of plate portions 222A that are erected at intervals and a connecting portion 221A that connects them on the lower side. Yes.

  And the board | substrate 11 of LED1 is attached to the lower surface of the radiation fin part 22A exposed to 31A of upper surface openings of the reflector 3A.

  Further, a plate-like portion 222A is cut out and a cylindrical rotating shaft 21A is attached to the heat radiation fin portion 22A on the axial extension line of the motor shaft 51.

  A working fluid is sealed in the hollow portion 211A of the rotating shaft 21A, and heat transport is performed by the movement.

  For example, as in the above-described embodiment, the rotating shaft 21A can have a structure in which a capillary wick is provided. Further, in this embodiment, the heat input to the rotating shaft 21A is performed at the lower side and the heat radiation is performed at the upper side. Therefore, a thermosiphon heat pipe structure using gravity may be used.

  A second radiating fin portion 61A is formed on the bearing portion 6A of the rotary shaft 21A configured in this manner.

  That is, as shown in FIG. 3, a cylindrical hole 613A is formed in the central portion 611A of the radiating fin portion 61A having a square shape in plan view, and a roller bearing 62A is disposed in the hole 613A. And the upper end of rotating shaft 21A is inserted in the center of the roller bearing 62A, and the bearing is formed.

  Then, heat is transported by the rotating shaft 21A, and heat is dissipated by the heat radiating fin portion 61A provided in the bearing portion 6A. Can be supplemented.

  Thus, the present invention can be applied to the light source unit 10A having a form different from that of the above embodiment.

  Other configurations and operational effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  The best embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment and example, and the design does not depart from the gist of the present invention. Such modifications are included in the present invention.

  For example, in the embodiments and examples described above, the case where the present invention is applied to a headlamp as a vehicular lamp has been described. However, the present invention is not limited to this, and the present invention may be applied to a vehicular lamp such as a fog lamp. .

  Furthermore, although LED1 was demonstrated as a semiconductor-type light source in the said embodiment and Example, it is not limited to this, The semiconductor-type light source and semiconductor laser (LD) using organic semiconductors, such as organic EL (electroluminescence), are not limited to this. ).

It is sectional drawing explaining the structure of the light source unit arrange | positioned at the headlamp of the best embodiment of this invention. It is a disassembled perspective view explaining schematic structure of the headlamp of the best embodiment of this invention. It is sectional drawing explaining the structure of the light source unit arrange | positioned at the headlamp of an Example.

Explanation of symbols

1 LED (semiconductor light source)
2 Heat sink part 21 Rotating shaft 22 Radiating fin part 5 Motor (swivel mechanism)
6 Bearing 61 Heat dissipation fin (second heat dissipation fin)
2A Heat sink portion 21A Rotating shaft 22A Heat radiation fin portion 6A Bearing portion 61A Heat radiation fin portion (second heat radiation fin portion)

Claims (2)

A vehicular lamp including a swivel mechanism that swings an irradiation direction of light emitted from a semiconductor light source,
The heat sink portion for mounting the semiconductor-type light source, possess a heat radiation fin portion formed adjacent to the semiconductor-type light source, and a rotation shaft of the swivel mechanism the working fluid is sealed, which is connected to the heat radiation fin portion A plurality of plate portions are formed at intervals in the heat dissipating fin portion, and the rotating shaft is attached to a location where the plate portions are cut out .   The vehicular lamp according to claim 1, wherein a second radiating fin portion is formed on a bearing side of the rotating shaft.

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