JP5606627B2 - Automotive headlamp - Google Patents

Description

  The present invention relates to an in-vehicle headlamp that uses a light source integrally provided with a lighting circuit.

As an in-vehicle light source, high-efficiency and long-life discharge lamps and LEDs (light-emitting diodes) have been widely used in place of conventional tungsten filament bulbs. While the light source has changed, the miniaturization of lamps is also progressing. For example, in the headlamp for in-vehicle use, in order to secure the passenger compartment space, the size in the vehicle front-rear direction has been shortened to reduce the mounting space. Things were desired. In order to shorten the vehicle longitudinal direction size, a light source in which the lighting circuit is integrally formed by directly connecting the light source to the lighting circuit has been proposed.
However, both the light source and the lighting circuit are components that generate heat themselves, and it is necessary to cope with the heat generated by each. Below, the conventional example regarding the countermeasure corresponding to the generated heat is given.

  For example, in the discharge lamp lighting device according to Patent Document 1, in order to suppress the heat generated by the discharge lamp from being transmitted to the discharge lamp lighting device, a holder having low heat conduction is provided between the discharge lamp and the discharge lamp lighting device. It is the structure to interpose. Thereby, the inflow of heat from the discharge lamp having a large calorific value to the discharge lamp lighting device is suppressed.

  Further, for example, in a discharge lamp device according to Patent Document 2, a case that houses a circuit that generates a voltage to be applied to a discharge lamp includes a resin case having a low thermal conductivity and a metal case having a high thermal conductivity. Is in contact with the connector portion of the discharge lamp. Thus, on the one hand, the heat generated by the discharge lamp is made difficult to conduct from the resin case to the metal case and cut off, while on the other hand, the heat generated by the circuit is conducted to the metal case and released to the outside.

  For example, the vehicle headlamp according to Patent Document 3 has a configuration in which openings are provided above and below the lighting circuit housing space of the lamp housing that houses the discharge lamp. Then, due to the natural convection of the air generated by the temperature difference between the lighting circuit housing space temperature and the outside air temperature that occurs during lighting of the discharge lamp, the heat generated by the lighting circuit is dissipated outside the lamp housing to cool the lighting circuit.

JP 2001-307520 A (paragraph 0006, FIG. 2 and FIG. 4) JP 2003-22702 (paragraph 0007 and FIG. 2) Japanese Patent Laying-Open No. 2003-51212 (paragraph 0009 and FIG. 1)

  When the light source and the lighting circuit are connected and arranged inside the headlamp, the heat emitted from both the light source and the lighting circuit must be dissipated in the closed headlamp case, and the light source and the lighting circuit emit. It becomes difficult to dissipate heat independently.

However, the configuration of Patent Document 1 described above suppresses inflow of heat from the discharge lamp to the lighting circuit by a holder having low heat conduction, and there is no description of means for radiating heat. There is no description of means for radiating heat generated by the lighting circuit.
Moreover, the structure of the said patent document 2 is dissipating the heat | fever which a lighting circuit emits from the metal case on the opposite side to a discharge lamp, suppressing the inflow of the heat from a discharge lamp to a lighting circuit by the resin case with low heat conduction. However, the heat generated by the light source and the lighting circuit is not both radiated.
The configuration of Patent Document 3 dissipates heat generated by the lighting circuit to the outside of the headlamp, and there is no description of means for dissipating heat generated by the discharge lamp into the headlamp case.

  As described above, in each of Patent Documents 1 to 3, the light source and the lighting circuit individually take countermeasures against heat, and the heat generated by the light source and the lighting circuit cannot be sufficiently dissipated from both. was there.

  The present invention has been made to solve the above-described problems. The heat generated from both the integrated light source and the lighting circuit is efficiently radiated into the headlamp, and one generated heat is transferred to the other. The aim is to avoid the negative effects of transmission.

The in-vehicle headlamp of the present invention includes a light source, a lighting circuit that is connected to the light source and driven to light, a light source that is inserted into the front side and a lighting circuit that is disposed on the back side, and reflects light emitted from the light source to the front. a reflecting mirror for directing the, thermally connected to the light source and the lighting circuit mounted on the rear side of the reflector, includes a heat radiating member for radiating heat conducted from the light source and the lighting circuit, the heat dissipation member is extended in the vertical direction The wall of the heat dissipation member has a cylindrical shape that opens vertically, and the light source is fixed in a state where the light source is inserted through the through holes of the reflector and the heat dissipation member. Has a first opening that communicates the front side of the reflecting mirror and the inside of the cylindrical heat dissipating member attached to the back of the reflecting mirror, and the lighting circuit case is in contact with the wall of the heat dissipating member The case and the wall of the heat dissipation member Each portion contacting one in which the second opening is formed.

  According to the present invention, by using the heat dissipating member thermally connected to each of the integrated light source and lighting circuit, the heat generated from both can be dissipated into the headlamp, and the heat generated by one is transferred to the other. The bad influence by transmitting can be avoided.

It is a longitudinal cross-sectional view which shows the structure of the vehicle-mounted headlamp which concerns on Embodiment 1 of this invention. 1 is a front view showing an internal configuration of an in-vehicle headlamp according to Embodiment 1. FIG. The structure of the vehicle-mounted headlamp which concerns on Embodiment 2 of this invention is shown, Fig.3 (a) is a longitudinal cross-sectional view, FIG.3 (b) is a top view of a thermal radiation member. The structure of the vehicle-mounted headlamp which concerns on Embodiment 3 of this invention is shown, Fig.4 (a) is a longitudinal cross-sectional view, FIG.4 (b) is a top view of a heat sink. The structure of the vehicle-mounted headlamp which concerns on Embodiment 4 of this invention is shown, Fig.5 (a) is a longitudinal cross-sectional view, FIG.5 (b) is a top view of a heat sink. It is a longitudinal cross-sectional view which shows the structure of the vehicle-mounted headlamp which concerns on Embodiment 5 of this invention. It is a longitudinal cross-sectional view which shows the structure of the vehicle-mounted headlamp which concerns on Embodiment 6 of this invention.

Hereinafter, in order to explain the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
An in-vehicle headlamp 1 shown in FIG. 1 includes a reflecting mirror 4, a discharge lamp 5, a lighting circuit 6, and a heat radiating plate (heat radiation) inside a headlamp case 3 integrated with a translucent front lens 2. Member) 7 is accommodated. When this on-vehicle headlamp 1 is mounted on a vehicle, the vertical direction on the drawing paper is the vehicle vertical direction, and the horizontal direction on the drawing paper is the vehicle front-rear direction.

FIG. 2 is a front view showing the internal configuration of the in-vehicle headlamp 1. The parabolic reflector 4 is disposed in the headlamp case 3 (not shown in FIG. 2) and supported by a support member (not shown). The discharge lamp 5 is inserted into the through hole 4a opened at the center of the reflecting mirror 4. The front surface of the reflecting mirror 4 is a concave mirror, which reflects the irradiation light from the discharge lamp 5 and directs it forward. Further, a heat radiating plate 7 made of a member having high thermal conductivity (for example, aluminum) is attached to a portion on the back side of the reflecting mirror 4 where the discharge lamp 5 is mounted and fixed. The heat radiating plate 7 is formed of a substantially rectangular plate and becomes a wall extending in the vertical direction (vertical direction on the drawing paper), and the discharge lamp 5 is inserted into a through hole 7a opened at the center thereof.
In the example of FIG. 2, the heat radiating plate 7 is configured by a substantially rectangular plate, but is not limited thereto, and may be an arbitrary shape that matches the shape of the headlamp case 3.

The discharge lamp 5 is provided with a connector portion 5a. The connector portion 5a is connected to the lighting circuit 6, and the discharge lamp 5 and the lighting circuit 6 are integrally configured. A power cord 8 extending from the lighting circuit 6 goes out of the headlamp case 3 and is connected to a battery power source.
In a state where the discharge lamp 5 is inserted into the through hole 7a of the heat radiating plate 7 and the through hole 4a of the reflecting mirror 4 from the back side, the flange 5b of the connector part 5a abuts on the edge of the through hole 7a and is fixed (not shown). It is fixed to the reflecting mirror 4 by a member. This fixing member may be composed of an arbitrary member, and it is sufficient that the discharge lamp 5 and the lighting circuit 6 can be fixed to the reflecting mirror 4. Further, in a state where the discharge lamp 5 and the lighting circuit 6 are fixed to the reflecting mirror 4, the discharge lamp 5 and the lighting circuit 6 are thermally connected to the heat radiating plate 7 by the connector portion 5 a coming into contact with the heat radiating plate 7. To do.

  With the above configuration, the lighting power from the lighting circuit 6 is supplied to the discharge lamp 5 through the connector portion 5a, and the discharge lamp 5 is lit. Irradiation light from the discharge lamp 5 is reflected by the reflecting mirror 4, passes through the front lens 2, and is irradiated forward of the vehicle. At this time, since the discharge lamp 5 and the lighting circuit 6 are components that generate heat, the heat generated by the both does not accumulate in the respective parts of the discharge lamp 5 and the lighting circuit 6, that is, the in-vehicle headlamp 1 It is necessary to lower the temperature of each part so as to avoid a part being heated and further the function being impaired by this overheating. Therefore, in the first embodiment, the heat propagated from the direction of the discharge lamp 5 to the reflecting mirror 4 by radiation is transmitted to the heat radiating plate 7 attached to the reflecting mirror 4 and thermally connected. Heat is dissipated in the lamp case 3. Further, the heat transmitted from both the discharge lamp 5 and the connector portion 5a connected to the lighting circuit 6 is radiated into the headlamp case 3 from the heat radiating plate 7 located at a substantially middle point between the two.

  As described above, according to the first embodiment, the in-vehicle headlamp 1 includes the discharge lamp 5 used as a light source, the lighting circuit 6 that performs lighting driving connected to the discharge lamp 5 via the connector portion 5a, and the discharge lamp 5. Is inserted in the front side and the lighting circuit 6 is arranged on the back side to reflect the light emitted from the discharge lamp 5 and forward, and the reflector 4 is attached to the back side of the reflecting mirror 4 via the connector portion 5a. And a heat radiation plate 7 that is thermally connected to the discharge lamp 5 and the lighting circuit 6 and radiates heat transmitted from the discharge lamp 5 and the lighting circuit 6. Therefore, both the heat generated by the discharge lamp 5 and the heat generated by the lighting circuit 6 can be radiated from the heat radiating plate 7 to the inside of the headlamp case 3. Further, it is possible to avoid an adverse effect due to the heat generated by one being transmitted to the other.

  In addition, the heat dissipation surface of the heat dissipation plate 7 should be installed in the vertical direction (vertical direction on the drawing paper) so as not to hinder the flow of gas that has become relatively hot due to heat dissipation to the upper space of the headlamp case 3. Is preferred. Thereby, it can avoid that the gas around the discharge lamp 5 and the lighting circuit 6 becomes high temperature locally.

Embodiment 2. FIG.
In the first embodiment, a plate-like heat radiating member such as the heat radiating plate 7 shown in FIG. 1 is used. However, the shape is not limited to this. Therefore, in the second embodiment, a configuration in which the heat radiating member is formed in a cylindrical shape will be described as a modification.
FIG. 3A shows a cross-sectional view of the in-vehicle headlamp 1 according to the second embodiment, and FIG. 3B shows a plan view of the cylindrical heat radiating member 10. In addition, the cylindrical heat radiating member 10 shown to Fig.3 (a) is the state cut | disconnected along the AA line of FIG.3 (b). In FIG. 3, the same or corresponding parts as in FIG.
The heat radiating member 10 includes a cylindrical portion formed with a cavity that opens vertically in the vertical direction, and improves the heat dissipation by utilizing the chimney effect to raise the gas in the cylindrical portion. In addition, in the example of FIG. 3, although the whole heat radiating member 10 was made into the cylindrical shape, it is not limited to this, You may form a cylindrical part in a part of plate-shaped heat radiating member.

Through holes 10a and 10b are formed in the surface of the cylindrical heat radiating member 10 facing the reflecting mirror 4 and the surface facing the lighting circuit 6, respectively. And the flange 5b of the connector part 5a contacts the edge part of the through-hole 10a. The flange 5 b is provided with an opening 11 that communicates the front side and the back side of the reflecting mirror 4 so that gas flows from the rear of the discharge lamp 5 into the front of the reflecting mirror 4. Thereby, the gas around the discharge lamp 5 convects and easily flows outward from the reflecting mirror 4, and the heat dissipation of the discharge lamp 5 is improved.
In addition, the opening position of the through hole 10a of the cylindrical heat radiating member 10 should just be a position facing the opening part 11, and the through hole 10a facing the several opening part 11 may be put together into one big hole. it can. Moreover, in the example of FIG. 3, although the two opening parts 11 were provided, it is not limited to this, The number of opening parts may be arbitrary.

  Furthermore, an opening 12 for allowing gas outside the case to flow into the case into the case of the lighting circuit 6, and an opening 13 for flowing the gas flowing into the case into the cylindrical heat radiating member 10; Is provided. In the illustrated example, the opening 12 for inflow is opened on the bottom surface of the case, and the two openings 13 for outflow are opened at positions facing the through holes 10 b of the tubular heat radiating member 10. The gas that has entered through the opening 12 and has flowed through the case of the lighting circuit 6 flows from the opening 13 through the through hole 10b into the cylindrical portion of the heat radiating member 10, and a part of the gas comes out to the opening 11 ( Arrow B shown in FIG. Further, a part of the gas that has flowed out of the opening 13 through the through hole 10b and into the cylindrical portion of the heat radiating member 10 comes out to the opening end above the cylindrical portion as it is (arrow shown in FIG. 3A). C). Thereby, gas can be flowed inside the case of the lighting circuit 6, and the heat dissipation of the lighting circuit 6 improves.

In the example of FIG. 3, one inflow opening 12 is provided on the bottom surface of the case. However, the present invention is not limited to this, and the number of openings and the opening position may be arbitrary. Similarly, two outflow openings 13 are provided, but the present invention is not limited to this, and the number of openings may be arbitrary. Moreover, the opening position of the through-hole 10b of the cylindrical heat radiating member 10 should just be a position which opposes the opening part 13, and the through-hole 10b which opposes the several opening part 13 may be put together into one big hole. it can.
Further, the openings 12 may be omitted, and some of the openings 13 provided at a plurality of locations may be used for inflow, and the remaining some may be used for outflow, and gas may flow inside and outside the case of the lighting circuit 6.

  As described above, according to the second embodiment, the in-vehicle headlamp 1 uses the cylindrical heat radiating member 10 opened vertically as the heat radiating member, so that the heat dissipation of the heat radiating plate 7 is improved. Both the heat generated by the discharge lamp 5 and the heat generated by the lighting circuit 6 can be efficiently radiated from the heat radiating plate 7 to the inside of the headlamp case 3. Further, it is possible to eliminate an adverse effect caused by the heat generated by one side being transmitted to the other side.

  Further, according to the second embodiment, the discharge lamp 5 is fixed in a state of being inserted through the through holes 4a and 10a of the reflecting mirror 4 and the cylindrical heat radiating member 10, respectively. An opening 11 is formed so that the front surface side of the reflecting mirror 4 and the cylindrical heat radiating member 10 side attached to the back surface of the reflecting mirror 4 communicate with each other through the through holes 4a and 10a. For this reason, gas comes to flow in the inside of the reflecting mirror 4 surrounding the discharge lamp 5, and the heat dissipation of the discharge lamp 5 is improved.

  Further, according to the second embodiment, the case of the lighting circuit 6 is fixed in a state of being in contact with the wall of the tubular heat radiating member 10, and the opening 13 is provided at a portion of the case that is in contact with the heat radiating member 10. One heat radiating member 10 is provided with a through hole 10b, and an opening 12 is also formed at a portion of the case that does not contact the heat radiating member 10. For this reason, gas comes to flow in the inside of the lighting circuit 6, and the heat dissipation of the lighting circuit 6 improves.

  The configuration of the second embodiment may be applied to the first embodiment. Specifically, in FIG. 1, an opening is opened at a portion of the flange 5 b that fits into the through hole 7 a of the heat sink 7, and the gas on the back side of the heat sink 7 passes through the opening to discharge the discharge lamp 5. It flows inside the surrounding reflector 4. Thereby, also in the vehicle-mounted headlamp 1 which concerns on the said Embodiment 1, the heat dissipation of the discharge lamp 5 can be improved.

Embodiment 3 FIG.
FIG. 4A shows a cross-sectional view of the in-vehicle headlamp 1 according to the third embodiment, and FIG. 4B shows a plan view of the heat sink 7. In addition, the heat sink 7 shown to Fig.4 (a) is the state cut | disconnected along DD line of FIG.4 (b). In FIG. 4, the same or corresponding parts as those in FIG.
On the surface of the heat radiating plate 7 facing the lighting circuit 6, a plurality of heat radiating fins 20 are erected along the vertical direction. By providing the heat dissipating fins 20, the heat radiation to the gas and the heat transfer area are expanded. Thereby, the heat dissipation area can be increased without obstructing the upward flow of gas, and the heat dissipation performance of the heat sink 7 can be improved.
In the example of FIG. 4, the heat radiating fins 20 are provided on the surface of the heat radiating plate 7 facing the lighting circuit 6. However, the present invention is not limited to this, and the surface of the heat radiating plate 7 facing the reflecting mirror 4 or both surfaces are provided. A heat radiating fin may be provided.

  Furthermore, in this Embodiment 3, the ventilation member 21 is installed in the lower part of the heat sink 7 in the headlamp case 3, and it ventilates upwards (arrow E shown to Fig.4 (a)). Thereby, the heat sink 7 can be forcibly air-cooled to improve heat dissipation. As the blowing member 21, a mechanical axial fan, a centrifugal fan, or a semiconductor fan using a piezoelectric element can be used. In addition, although illustration is abbreviate | omitted, the ventilation member 21 takes out the power cable for electric power feeding out of the headlamp case 3, and receives power supply from a battery power supply.

  As described above, according to the third embodiment, the in-vehicle headlamp 1 is configured to include the heat radiation fins 20 erected along the vertical direction on the surface of the heat radiation plate 7. The heat dissipation can be improved by increasing the size, and both the heat generated by the discharge lamp 5 and the heat generated by the lighting circuit 6 can be efficiently radiated from the heat radiating plate 7 into the headlamp case 3. Further, it is possible to eliminate an adverse effect caused by the heat generated by one side being transmitted to the other side.

  Moreover, according to Embodiment 3, since the vehicle-mounted headlamp 1 is configured to include the air blowing member 21 that blows air toward the heat radiating plate 7, the heat radiating plate 7 can be forcibly air-cooled to improve heat dissipation. it can.

  In the third embodiment, the air blowing member 21 is installed on the heat radiating plate 7 provided with the heat radiating fins 20. However, the present invention is not limited to this, and the in-vehicle headlamp according to the first and second embodiments. The air blowing member 21 may be installed in 1. Moreover, you may provide the radiation fin 20 in the surface of the cylindrical heat radiating member 10 of the said Embodiment 2. FIG.

Embodiment 4 FIG.
FIG. 5A shows a cross-sectional view of the in-vehicle headlamp 1 according to the fourth embodiment, and FIG. 5B shows a plan view of the heat sink 7. In addition, the heat sink 7 shown to Fig.5 (a) is the state cut | disconnected along the FF line | wire of FIG.5 (b). In FIG. 5, the same or corresponding parts as those in FIGS. 1 and 4 are denoted by the same reference numerals and description thereof is omitted.
On the surface of the heat radiating plate 7 facing the lighting circuit 6, a plurality of convex portions 30 are projected. Thereby, a turbulent flow can be generated in the gas flowing in the vicinity of the surface of the heat radiating plate 7 and the heat radiating property of the heat radiating plate 7 can be improved.
In addition, in the example of FIG. 5, the convex part 30 was provided in the surface which faces the lighting circuit 6 of the heat sink 7, However, It is not limited to this, On the surface which faces the reflective mirror 4 of the heat sink 7, or both surfaces A convex part may be provided. Further, a similar effect can be obtained by providing a concave portion or an uneven portion instead of the convex portion 30.

  Moreover, the ventilation member 21 is not essential and may be omitted.

  As described above, according to the fourth embodiment, the in-vehicle headlamp 1 is configured to include the convex portion 30 formed on the surface of the heat radiating plate 7, so that the gas flow close to the surface of the heat radiating plate 7 is disturbed. Thus, heat dissipation can be improved, and both the heat generated by the discharge lamp 5 and the heat generated by the lighting circuit 6 can be efficiently radiated from the heat radiating plate 7 into the headlamp case 3. Further, it is possible to eliminate an adverse effect caused by the heat generated by one side being transmitted to the other side.

  The configuration of the fourth embodiment may be applied to the second embodiment. Specifically, in FIG. 3, convex portions 30 (or concave portions or concave-convex portions) are provided on the surface (outer surface or inner surface) of the cylindrical heat radiating member 10. Thereby, also in the vehicle-mounted headlamp 1 which concerns on the said Embodiment 2, the heat dissipation of the cylindrical heat radiating member 10 can be improved.

Embodiment 5 FIG.
FIG. 6 shows a cross-sectional view of the in-vehicle headlamp 1 according to the fifth embodiment. In FIG. 6, the same or corresponding parts as those in FIG.
In the fifth embodiment, a heat radiating plate 7 is provided at a portion where the discharge lamp 5 is mounted and fixed to the reflecting mirror 4, and a heat radiating member 40 is also provided in front of the reflecting mirror 4 and below the front lens 2. Furthermore, a heat pipe 41 that is thermally connected to the heat radiating plate 7 and the heat radiating member 40 is provided. By providing the heat pipe 41 with high heat transfer efficiency, the heat of the discharge lamp 5 and the lighting circuit 6 transmitted to the heat radiating plate 7 is transferred from the heat radiating plate 7 to the heat radiating member 40 through the heat pipe 41, The heat is radiated to the space near the front lens 2 where the temperature is low.

In addition, the upper surface of the heat radiating member 40 may be used as a part of the reflecting mirror 4 with a mirror surface. In addition, the heat radiation property may be further improved by providing heat radiation fins and convex portions on the surface of the heat radiation member 40.
Incidentally, since heat is mainly radiated from the heat radiating member 40 instead of the heat radiating plate 7, the heat radiating plate 7 absorbs the heat generated by the discharge lamp 5 and the lighting circuit 6 and is transferred to the heat pipe 41. Therefore, the heat sink 7 can be made smaller than in the first embodiment.

  As described above, according to the fifth embodiment, the in-vehicle headlamp 1 is configured to include the heat pipe 41 thermally connected to the heat radiating plate 7 and the heat radiating member 40 which are heat radiating members. The heat of the heat radiating plate 7 can be transferred to a relatively low temperature space in the headlamp case 3 to improve the heat dissipation of the discharge lamp 5 and the lighting circuit 6. Both heats generated by the circuit 6 can be efficiently radiated from the heat radiating plate 7 into the headlamp case 3. Further, it is possible to eliminate an adverse effect caused by the heat generated by one side being transmitted to the other side.

Embodiment 6 FIG.
In the in-vehicle headlamp 1 according to the first embodiment, the example in which the discharge lamp 5 is used as the light source has been described. However, an LED (light emitting diode) can also be used as the light source.
FIG. 7 is a cross-sectional view showing a configuration of the in-vehicle headlamp 1 according to the sixth embodiment, and a chip-type LED 50 is used as a light source. 7 that are the same as or equivalent to those in FIG. 1 are assigned the same reference numerals, and descriptions thereof are omitted. In the configuration example of FIG. 7, a substrate on which the LED 50 is mounted is installed on a support base 51 to serve as a light source unit. The light source unit and the lighting circuit 6 that drives the LED 50 to light are connected by a connector unit 5a, and both the light source unit and the lighting circuit 6 are thermally connected to the heat radiating plate 7 through the connector unit 5a.

  As described above, according to the sixth embodiment, when the LED 50 is used as the light source of the in-vehicle headlamp 1, both the heat generated by the light source unit having the LED 50 and the heat generated by the lighting circuit 6 are transferred from the heat radiating plate 7 to the head. Heat can be radiated into the lamp case 3. Further, it is possible to avoid an adverse effect due to the heat generated by one being transmitted to the other.

  Moreover, although illustration is abbreviate | omitted, it is also possible to use LED for a light source also about the vehicle-mounted headlamp 1 which concerns on the said Embodiment 2-5.

  In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .

  As described above, the in-vehicle headlamp according to the present invention radiates the heat generated by the light source and the lighting circuit in a lump so that the light source and the lighting circuit are integrated and accommodated in the headlamp case. It is suitable for use in an in-vehicle headlamp having the structure described above.

  DESCRIPTION OF SYMBOLS 1 Vehicle headlamp, 2 Front lens, 3 Head lamp case, 4 Reflecting mirror, 4a, 7a, 10a, 10b Through hole, 5 Discharge lamp, 5a Connector part, 5b Flange, 6 Lighting circuit, 7 Heat sink (Heat dissipation member) ), 8 power cord, 10, 40 heat radiating member, 11-13 opening, 20 heat radiating fin, 21 air blowing member, 30 convex portion, 41 heat pipe, 50 LED, 51 support base.

Claims (6)

A light source;
A lighting circuit connected to the light source to drive lighting;
An in-vehicle headlamp provided with a reflecting mirror that is inserted through the light source on the front side and the lighting circuit is arranged on the back side, and reflects the light emitted from the light source and directs it forward.
A heat dissipating member attached to the back side of the reflecting mirror and thermally connected to the light source and the lighting circuit, and dissipating heat transmitted from the light source and the lighting circuit ,
The heat dissipating member has a wall extending in a vertical direction,
A part of the wall of the heat radiating member has a cylindrical shape opened up and down in the vertical direction,
The light source is fixed in a state of being inserted through the through holes of the reflecting mirror and the heat radiating member, and the cylindrical parts attached to the fixing portion on the front side of the reflecting mirror and the back surface of the reflecting mirror are fixed. A first opening communicating with the inside of the heat dissipation member is formed;
The lighting circuit case is fixed in contact with the wall of the heat radiating member, and a second opening is formed in each portion where the case and the wall of the heat radiating member are in contact. An in-vehicle headlamp characterized by   The in-vehicle headlamp according to claim 1, further comprising a blowing member that blows air toward the heat radiating member.   The in-vehicle headlamp according to claim 1, further comprising a heat dissipating fin provided upright along a vertical direction on a surface of the heat dissipating member.   The in-vehicle headlamp according to claim 1, further comprising one or both of a convex portion and a concave portion formed on a surface of the heat radiating member.   The in-vehicle headlamp according to claim 1, further comprising a heat pipe thermally connected to the heat radiating member.   The in-vehicle headlamp according to claim 1, wherein the light source is a discharge lamp or an LED.

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