Vehicle Lighting

Abstract

A vehicle lighting unit equipped with a circuit board to which a light source is mounted, a heat sink which releases heat produced when driving the light source, and has the circuit board attached to the front or rear surface thereof, and a cooling fan positioned above or below the circuit board and heat sink, wherein the cooling airflow produced by the cooling fan flows along the heat sink and the light source. As a result, it is possible to improve light source cooling performance while also improving compactness in the front-rear direction, because the cooling airflow produced by the cooling fan positioned above or below the circuit board and heat sink flows along the heat sink and the circuit board which is attached to the front or rear surface of the heat sink.

Description

[Technical field]

[0001] The present invention relates to a technical field of a vehicle lamp including a heat sink that dissipates heat generated when a light source is driven and a cooling fan that generates cooling air. [Background technology]

[0002] For example, some vehicle lamps have a configuration in which a heat sink that dissipates heat generated when the light source is operated and a cooling fan that generates cooling air are arranged inside the lamp outer casing, which is made up of a cover and a lamp housing, thereby suppressing a rise in temperature of the light source and ensuring good operating conditions of the light source (see, for example, Patent Document 1).

[0003] In the vehicle lamp described in Patent Document 1, a circuit board on which a light source is mounted is attached to the front surface of a heat sink, and a cooling fan is disposed on the rear side of the heat sink, and the cooling fan rotates when the light source is driven.

[0004] The cooling fan generates cooling air, which flows forward and part of which flows through an air passage formed below the heat sink and wraps around to the front side of the heat sink. The cooling air that flows forward is blown onto the heat sink, and the cooling air that flows through the air passage and wraps around to the front side of the heat sink flows upward and along the light source. Therefore, the cooling performance for the light source is improved by the cooling air blown onto the heat sink and the cooling air that flows along the light source. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-91848 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the vehicle lamp described in Patent Document 1, a portion of the cooling air flows through the air passage along the underside of the heat sink and then flows toward the light source, so that the temperature of the cooling air increases as it flows through the air passage, and there is a risk that sufficient cooling performance for the light source will not be ensured.

[0007] Furthermore, in vehicle lighting fixtures, the required parts such as the projection lens, lens holder, circuit board, heat sink, etc. are often arranged side by side in the fore-and-aft direction (optical axis direction), which tends to make the fixture large in size in the fore-and-aft direction, and therefore there is often a demand for miniaturization in the fore-and-aft direction.

[0008] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a vehicle lamp that is compact in size in the front-rear direction and has improved cooling performance for the light source. [Means for solving the problem]

[0009] First, the vehicle lamp of the present invention comprises a circuit board having a light source mounted thereon, a heat sink having the circuit board attached to its front or rear surface and dissipating heat generated when the light source is driven, and a cooling fan disposed above or below the circuit board and the heat sink, and cooling air generated by the cooling fan flows along the heat sink and the light source.

[0010] As a result, cooling air generated by a cooling fan disposed above or below the circuit board and heat sink flows along the heat sink and the circuit board attached to the front or rear surface of the heat sink.

[0011] Secondly, in the vehicle lamp according to the present invention described above, it is desirable that the cooling fan is provided with a rotating shaft and a plurality of blades, and that the rotating shaft is positioned closer to the heat sink than the light source in the front-rear direction.

[0012] As a result, the blades are positioned above or below the light source, so the amount of cooling air flowing along the light source increases.

[0013] Thirdly, in the vehicle lamp according to the present invention described above, a reflector is provided which reflects light emitted from the light source, and the reflector is formed with an intake opening which is positioned below or above the cooling fan and takes in cooling air generated by the cooling fan, and it is desirable that the cooling air taken in from the intake opening flows towards the light source.

[0014] As a result, the cooling air generated by the cooling fan is taken in through an intake opening formed in the reflector and directed toward the light source, so there is no need to provide a dedicated component separate from the reflector for directing the cooling air toward the light source.

[0015] Fourthly, in the vehicle lamp of the present invention described above, it is desirable that a guide inclined surface is formed on the reflector to guide the cooling air taken in through the intake opening, and that the guide inclined surface is inclined so as to approach the light source as it moves away from the cooling fan in the vertical direction.

[0016] As a result, the cooling air generated by the cooling fan is guided by the guide inclined surface toward the light source, so that the cooling air flows in a concentrated manner along the light source.

[0017] Fifth, in the vehicle lamp according to the present invention described above, it is preferable that the reflector is made of a metal material and attached to the heat sink.

[0018] This allows heat generated when the light source is driven to be transferred to both the heat sink and the reflector.

[0019] Sixth, in the vehicle lamp of the present invention described above, it is desirable that the surface of the circuit board on which the light source is mounted is formed as a light source mounting surface, and that the circuit board is arranged with the light source mounting surface inclined relative to the vertical direction toward the cooling fan.

[0020] This makes it easier for the cooling air generated by the cooling fan to flow along the light source.

[0021] Seventh, in the vehicle lamp according to the present invention described above, a projection lens that controls the light emitted from the light source and a protector having a shading portion that blocks sunlight entering through the projection lens are provided, and it is desirable that the shading portion is provided as a guide portion that guides cooling air toward the projection lens.

[0022] As a result, the cooling air is guided toward the projection lens by the light-shielding portion of the protector. Effect of the Invention

[0023] According to the present invention, cooling air generated by a cooling fan arranged above or below the circuit board and heat sink flows along the heat sink and the circuit board attached to the front or rear surface of the heat sink, thereby making it possible to reduce the size in the front-to-back direction while improving the cooling performance for the light source. [Brief description of the drawings]

[0024] [Figure 1] 2 to 5 show an embodiment of a vehicle lamp according to the present invention, and this figure is a cross-sectional view of the vehicle lamp. [Diagram 2] FIG. 2 is an exploded perspective view of the lamp unit. [Diagram 3] FIG. 2 is a perspective view showing a reflector and a circuit board. [Figure 4] FIG. 4 is a rear view showing the reflector and the circuit board. [Diagram 5] FIG. 4 is a cross-sectional view showing a path of cooling air. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a vehicle lamp according to the present invention will be described with reference to the accompanying drawings.

[0026] The vehicle lamp 1 is, for example, a vehicle headlamp, and is attached to both the left and right ends of the front end of the vehicle body.

[0027] A vehicle lamp 1 comprises a lamp housing 2 having an opening at a front end and a cover 3 that closes the opening of the lamp housing 2 (see FIG. 1). The lamp housing 2 and the cover 3 form a lamp outer case 4, and the internal space of the lamp outer case 4 is formed as a lamp chamber 5.

[0028] A lamp unit 6 is disposed in the lamp chamber 5. The lamp unit 6 has a lens holder 7, a projection lens 8, a heat sink 9, a circuit board 10, a reflector 11, and a protector 12 (see FIGS. 1 and 2).

[0029] The lamp unit 6 is supported by the lamp housing 2 via an optical axis adjustment mechanism (not shown). Therefore, by operating the optical axis adjustment mechanism, the lamp unit 6 can be tilted vertically or horizontally with respect to the lamp housing 2, thereby making it possible to adjust the optical axis of the light (aiming adjustment or leveling adjustment).

[0030] The lens holder 7 has a substantially cylindrical holding tube portion 7a whose axial direction runs in the front-rear direction, and legs 7b, 7b each protruding rearward from the holding tube portion 7a.

[0031] The projection lens 8 is held by the holding cylinder portion 7a of the lens holder 7. The projection lens 8 is composed of a lens main body portion 8a through which light passes and a flange-shaped attachment portion 8b that protrudes outward from the rear end portion of the lens main body portion 8a, which are formed as one unit. The projection lens 8 is held by the lens holder 7 with the attachment portion 8b attached to the holding cylinder portion 7a from the front side.

[0032] The projection lens 8 is formed, for example, by injection molding using acrylic. Acrylic is a material suitable for molding resin parts by injection molding together with polycarbonate, and is a material with higher transparency and good moldability than polycarbonate, but is known to have lower heat resistance than polycarbonate.

[0033] For this reason, the projection lens 8 is held by the lens holder 7 with the lower end of the mounting portion 8b at the gate position. By positioning the gate position, where residual distortion may remain, at the lowest position, the portion where residual distortion may remain is less susceptible to the effects of heat compared to when the gate position is located higher, making it possible to suppress deformation of the portion where the gate position is located.

[0034] The heat sink 9 has a heat dissipation portion 13, a mounting portion 14, and a bridging portion 15, which are made of a metal material having high thermal conductivity.

[0035] The heat dissipation section 13 has a front surface 16, side surfaces 17, 17, a top surface 18, and fins 19, 19, .... The front surface 16 is inclined downward toward the rear with respect to the vertical direction, and the front surface 16a is formed as a board mounting surface. The side surfaces 17, 17 protrude rearward from both left and right ends of the front surface 16. The top surface 18 protrudes rearward from the upper end of the front surface 16, and both left and right ends are connected to the upper ends of the side surfaces 17, 17, respectively. An inlet hole 18a is formed in the upper surface 18 except for the outer periphery. The fins 19, 19, ... protrude rearward from the front surface 16 and are positioned between the side surfaces 17, 17, separated from each other on the left and right.

[0036] The mounting portions 14, 14 protrude from both the left and right ends of the front surface portion 16 to positions extending from the outside to the bottom on the sides. The legs 7b, 7b of the lens holder 7 are attached to the mounting portions 14, 14 from the front side, for example, by screws or the like.

[0037] The bridging portion 15 is provided as a portion that connects the upper ends of the mounting portions 14, 14. The bridging portion 15 increases the strength of the heat sink 9.

[0038] The circuit board 10 faces approximately in the front-rear direction, its front surface is formed as a light source mounting surface 10a, and is attached to a front surface 16a of the front portion 16. Therefore, the circuit board 10 is inclined rearward and downward with respect to the vertical direction according to the inclination state of the front portion 16, and is disposed with the light source mounting surface 10a facing slightly upward with respect to the front.

[0039] The light sources 20, 20, ... are mounted on the light source mounting surface 10a of the circuit board 10 near the upper end. For example, light emitting diodes (LEDs) are used as the light sources 20. The light sources 20, 20, ... are arranged, for example, in two rows, upper and lower, with multiple light sources arranged left and right. The light sources 20, 20, ... arranged on the upper side are for example, for low beam, and the light sources 20, 20, ... arranged on the lower side are for example, for high beam.

[0040] Furthermore, in the vehicle lighting device 1, variable light distribution control is performed in which the light sources 20, 20, ... are turned on and off individually depending on the driving conditions of the vehicle and the surrounding environment, etc., so that dazzling light is not generated for drivers and pedestrians in oncoming vehicles or preceding vehicles.

[0041] The reflector 11 is made of a metal material such as aluminum having high thermal conductivity. The reflector 11 has a horizontally long base surface portion 21 facing the front-rear direction, reflective protrusions 22, 22 protruding forward from positions near both the left and right ends of the upper end portion of the base surface portion 21, and a reflective portion 23 positioned between the reflective protrusions 22, 22 (see Figs. 2 to 4).

[0042] The opposing surfaces of the reflecting protrusions 22, 22 are formed as side reflecting surfaces 22a, 22a, respectively.

[0043] A horizontally elongated first through hole 23a and a second through hole 23b are formed vertically spaced apart in the reflecting portion 23. The upper and lower wall surfaces of the reflecting portion 23 that form the first through hole 23a are formed as first reflecting surfaces 24, 24, respectively, and the upper and lower wall surfaces of the reflecting portion 23 that form the second through hole 23b and the inclined surfaces continuing thereto are formed as second reflecting surfaces 25, 25, respectively.

[0044] The reflector 11 is provided with guide portions 26, 26 on the rear side of the reflecting protrusions 22, 22, respectively. The guide portion 26 is formed in a shape that opens upward and backward. The inner surface of each of the guide portions 26, 26 is composed of three surfaces, and comprises a first guide inclined surface 26a, 26a in the center in the left-right direction, a second guide inclined surface 26b, 26b on the outside in the left-right direction, and a third guide inclined surface 26c, 26c on the inside in the left-right direction. The opening at the upper end of the guide portion 26 is formed as an intake opening 26d.

[0045] The first guiding inclined surfaces 26a, 26a are inclined so as to displace rearward as they go downward, the second guiding inclined surfaces 26b, 26b are inclined so as to approach each other in the left-right direction as they go downward, and the third guiding inclined surfaces 26c, 26c are also inclined so as to approach each other in the left-right direction as they go downward.

[0046] The reflector 11 is attached from the front to the mounting portions 14, 14 of the heat sink 9 by screwing both left and right ends of the base surface portion 21. When the reflector 11 is attached to the heat sink 9, the base surface portion 21 and the reflecting portion 23 are brought into a state in which they are close to the circuit board 10 from the front, and the light sources 20, 20, ... for low beam are positioned directly behind the first passing hole 23a, and the light sources 20, 20, ... for high beam are positioned directly behind the second passing hole 23b.

[0047] In this way, the reflector 11 is brought into a state in which the base surface portion 21 and the reflective portion 23 are close to the circuit board 10 from the front side, and the first guiding inclined surfaces 26a, 26a approach the light sources 20, 20, ... in the front-to-back direction as they move downward, and the second guiding inclined surfaces 26b, 26b and the third guiding inclined surfaces 26c, 26c both approach the light sources 20, 20, ... in the left-to-right direction as they move downward.

[0048] The protector 12 is formed, for example, by bending a plate-shaped metal material into a predetermined shape. The protector 12 is composed of a horizontally long base 12a facing the front-rear direction, fastening parts 12b, 12b protruding upward from both left and right ends of the base 12a, a first light-shielding part 12c protruding diagonally downward from the base 12a and bent forward with respect to the base 12a, and second light-shielding parts 12d, 12d protruding forward from inner ends in the left-right direction of the fastening parts 12b, 12b. The fastening parts 12b, 12b of the protector 12 are attached to the attachment parts 14, 14 of the heat sink 9 from the front side.

[0049] In the vehicle lamp 1, the base surface portion 21 of the reflector 11, the fastening portions 12b, 12b of the protector 12, and the legs 7b, 7b of the lens holder 7 are attached to the mounting portions 14, 14 of the heat sink 9 from the front side by being so-called fastened together in that order from the front side, for example, by screwing.

[0050] A cooling fan 27 is attached to the heat dissipation portion 13 of the heat sink 9 by, for example, screws (see FIGS. 1 and 2).

[0051] Cooling fan 27 has a case portion 28 having a substantially rectangular outer shape, and a rotary drive portion 29 arranged rotatably inside case portion 28. Rotary drive portion 29 has a shaft portion 29a whose axial direction is in the vertical direction, and a plurality of blades 29b, 29b, ... each protruding from the outer circumferential surface of shaft portion 29a.

[0052] The cooling fan 27 has a case 28 attached to the upper surface 18 of the heat dissipation unit 13 from above, and is positioned directly behind the bridging unit 15 by being attached to the upper surface 18. When the cooling fan 27 is attached to the heat dissipation unit 13, the rotary drive unit 29 is disposed at a position straddling the front surface 16 of the heat sink 9 from the front to the rear, and the shaft 29a (rotary shaft 29c) is positioned behind the light sources 20, 20, ... mounted on the circuit board 10 (see FIG. 5). Therefore, a certain gap S is formed between the shaft 29a and the light source 20. The front end of the shaft 29a and the rear end of the light source 20 may coincide, in which case the gap S is set to zero.

[0053] Also, as described above, the circuit board 10 is inclined downward toward the rear with respect to the vertical direction in accordance with the inclined state of the front portion 16, and the light source mounting surface 10a is arranged in a state inclined toward the cooling fan 27 with respect to the vertical direction.

[0054] In the vehicle lamp 1 configured as described above, when the light sources 20, 20, . . . are driven to emit light forward, the emitted light passes through the projection lens 8 and is irradiated forward.

[0055] At this time, the light emitted from the low beam light source 20 passes through the first through hole 23a of the reflector 23, is reflected by the first reflecting surfaces 24, 24 and the side reflecting surfaces 22a, 22a, and is irradiated forward with light distribution control. On the other hand, the light emitted from the high beam light source 20 passes through the second through hole 23b of the reflector 23, is reflected by the second reflecting surfaces 25, 25, and is irradiated forward with light distribution control.

[0056] In addition, in a vehicle, depending on the position of the sun relative to the vehicle lamp 1, there is a risk that sunlight may pass through the projection lens 8 and enter the inside of the lamp unit 6, but the incident sunlight is blocked by the first light-shielding portion 12c and the second light-shielding portions 12d, 12d of the protector 12. Therefore, each part of the lamp unit 6, particularly parts made of a resin material, is prevented from melting due to the incident sunlight. In particular, the first light-shielding portion 12c is bent toward the projection lens 8 with respect to the base portion 12a, and is positioned close to the projection lens 8, so that it has a high blocking ability for sunlight that passes through the projection lens 8 and enters the inside of the lamp unit 6.

[0057] When the above-mentioned light sources 20, 20, ... are driven, heat is generated from the light sources 20, 20, ... and the electronic components and each circuit pattern of the circuit board 10. The heat generated in the light sources 20, etc. is transferred, with a partial exception, to the heat sink 9 and released from each portion of the heat sink 9, in particular the fin portions 19, 19, ....

[0058] At this time, cooling fan 27 is in a driven state to rotate rotation drive unit 29, and cooling air generated by the rotation of rotation drive unit 29 passes through inlet hole 18a of heat dissipation unit 13 and flows downward along fins 19, 19, ... in a first path P1 (see FIG. 5). Therefore, the cooling air is blown onto heat dissipation unit 13, particularly fins 19, 19, ..., ensuring high heat dissipation from heat sink 9.

[0059] On the other hand, a portion of the heat generated in the light source 20, etc. is released into the space of the lamp chamber 5 on the front side of the light source mounting surface 10a, or is transferred to the reflector 11 made of a metal material with high thermal conductivity and released from the reflector 11.

[0060] At this time, the cooling fan 27 is in a driven state, the rotary drive unit 29 is rotated, and the cooling air generated by the rotation of the rotary drive unit 29 passes through the gap between the reflector 11 and the circuit board 10 from the intake opening 26d, is blown onto the light sources 20, 20, ..., and flows downward along the second path P2. Therefore, the heat released into the space of the lamp chamber 5 on the front side of the light source mounting surface 10a is moved downward by the cooling air flowing along the light sources 20, 20, ..., and high heat dissipation is ensured for the heat released from the light sources 20, etc. into the space of the lamp chamber 5 on the front side.

[0061] As described above, the cooling air generated by the rotation of the rotary drive unit 29 is taken in through the intake opening 26d and flows toward the light sources 20, 20, . . .

[0062] Therefore, since the cooling air generated by the cooling fan 27 is taken in through the intake opening 26d formed in the reflector 11 and directed toward the light sources 20, 20, ..., there is no need to provide a dedicated component separate from the reflector 11 for directing the cooling air toward the light sources 20, 20, .... This makes it possible to reliably suppress the temperature rise of the light sources 20, 20, ... while reducing the number of parts and simplifying the structure.

[0063] In addition, the reflector 11 is formed with a first guide inclined surface 26a, 26a, a second guide inclined surface 26b, 26b, and a third guide inclined surface 26c, 26c that guide the cooling air taken in through the intake opening 26d, and the first guide inclined surface 26a, 26a, the second guide inclined surface 26b, 26b, and the third guide inclined surface 26c, 26c are inclined so as to approach the light sources 20, 20, ... as they move away from the cooling fan 27 in the vertical direction.

[0064] Therefore, the cooling air flows intensively along the light sources 20, 20, . . . , and the cooling efficiency for the light sources 20, 20, .

[0065] Furthermore, the circuit board 10 is inclined rearwardly downward with respect to the vertical direction in accordance with the inclination of the front surface 16, and is disposed with the light source mounting surface 10a inclined toward the cooling fan 27 with respect to the vertical direction.

[0066] Therefore, the cooling air generated by the cooling fan 27 can easily flow along the light sources 20, 20, . . . , so that the cooling efficiency for the light sources 20, 20, .

[0067] Furthermore, when the light sources 20, 20, ... are driven, the cooling air generated by the rotation of the rotary drive unit 29 passes through the gap between the reflector 11 and the circuit board 10 and flows downward on the second path P2, and also passes through the front side of the reflector 11 and flows downward on the third path P3. Therefore, the cooling air is blown onto both the front and rear surfaces of the reflector 11, ensuring high heat dissipation from the reflector 11.

[0068] The cooling air flowing downward in the third path P3 flows from the front side of the reflector 11 along the first light-shielding portion 12c of the protector 12. At this time, the first light-shielding portion 12c is bent forward with respect to the base portion 12a and is inclined in a direction approaching the lower end of the projection lens 8 as it moves downward. Therefore, the cooling air flowing along the first light-shielding portion 12c in the third path P3 flows toward the lower end of the attachment portion 8b of the projection lens 8.

[0069] As described above, the lower end of the mounting portion 8b corresponds to the gate position during injection molding, and therefore there is a possibility that residual distortion remains, making it a part that is prone to deformation due to heat. However, in the third path P3 described above, the cooling air flowing along the first shading portion 12c is blown onto the lower end of the mounting portion 8b.

[0070] Therefore, since the lower end of the mounting portion 8b is cooled by cooling air, deformation of the lower end of the mounting portion 8b can be prevented even in cases where residual strain remains at the lower end of the mounting portion 8b, making it prone to deformation due to heat.

[0071] As described above, the first shading portion 12c of the protector 12 is provided as a guide portion that guides the cooling air toward the projection lens 8. Therefore, the cooling air is guided toward the projection lens 8 by the first shading portion 12c of the protector 12, thereby improving the functionality of the protector 12 and preventing deformation of the projection lens 8 due to heat.

[0072] As described above, the vehicle lamp 1 comprises a circuit board 10 on which the light source 20 is mounted, a heat sink 9 on whose front surface 16a the light source 20 is attached and which dissipates heat generated when the light source 20 is driven, and a cooling fan 27 disposed above the circuit board 10 and the heat sink 9, and the cooling air generated by the cooling fan 27 flows along the heat sink 9 and the light source 20.

[0073] Therefore, the cooling air generated by the cooling fan 27 arranged above the circuit board 10 and the heat sink 9 flows along the heat sink 9 and the circuit board 10 attached to the front surface 16a of the heat sink 9, thereby making it possible to improve the cooling performance for the light source 20 while achieving miniaturization in the front-to-rear direction.

[0074] In the above, an example is shown in which the cooling fan 27 is disposed above the circuit board 10 and the heat sink 9, and the cooling air flows from top to bottom by the cooling fan 27. However, conversely, the cooling fan 27 may be configured so that air is sucked in from below and blown out upward by the rotation of the rotary drive unit 29, and the cooling air flows from bottom to top along the heat sink 9 and the light source 20.

[0075] Also, the cooling fan 27 may be disposed below the circuit board 10 and the heat sink 9, and the cooling air may flow along the heat sink 9 and the light source 20. In this case, the cooling fan 27 may cause the cooling air to flow from below to above, or the cooling fan 27 may cause the cooling air to flow from above to below.

[0076] However, when the cooling fan 27 is positioned below the circuit board 10 and the heat sink 9, it is desirable to position the circuit board 10 with its front tilted downward relative to the vertical direction so that the cooling air can easily flow along the light sources 20, 20, ...

[0077] Furthermore, in the vehicle lamp 1, the cooling fan 27 is provided with a shaft portion 29a and a plurality of blades 29b, and the shaft portion 29a is positioned closer to the heat sink 9 than the light source 20 in the front-rear direction.

[0078] Therefore, since the blades 29b are positioned above or below the light source 20, the amount of cooling air flowing along the light source 20 increases, and the cooling performance regarding heat generated when the light source 20 is driven can be improved.

[0079] Furthermore, a reflector 11 is made of a metal material and attached to the heat sink 9 .

[0080] Therefore, heat generated when the light sources 20, 20, . . . are driven is transferred to both the heat sink 9 and the reflector 11, so that the cooling efficiency can be further improved by dissipating heat from the reflector 11 in addition to the heat sink 9.

[0081] Although the above describes an example in which the vehicle lamp 1 is a vehicle headlamp, the vehicle lamp 1 may be a vehicle lamp other than a vehicle headlamp, and may be a vehicle lamp that irradiates light forward or backward.

[0082] In the case of a vehicle lamp that irradiates light rearward, a circuit board 10 is attached to the rear surface of a heat sink 9, and a cooling fan 27 is disposed above or below the circuit board 10 and the heat sink 9, and the cooling air generated by the cooling fan 27 flows along the heat sink 9 and the light source 20. [Explanation of symbols]

[0083] REFERENCE SIGNS LIST 1...vehicle lamp, 9...heat sink, 10...circuit board, 11...reflector, 12...protector, 12c...first light shielding portion, 16a...front surface, 20...light source, 26a...first guiding inclined surface, 26b...second guiding inclined surface, 26c...third guiding inclined surface, 26d...intake opening, 27...cooling fan, 29a...shaft portion, 29b...blade

Claims

1. A circuit board having a light source mounted thereon; a heat sink having a front or rear surface to which the circuit board is attached and which dissipates heat generated when the light source is driven; a cooling fan disposed above or below the circuit board and the heat sink; The cooling air generated by the cooling fan flows along the heat sink and the light source, The cooling fan is provided with a rotating shaft and a plurality of blades, The rotation axis is located closer to the heat sink than the light source in the front-rear direction. Vehicle lighting fixtures.

2. A circuit board on which a light source is mounted; a heat sink having a front or rear surface to which the circuit board is attached and which dissipates heat generated when the light source is driven; a cooling fan disposed above or below the circuit board and the heat sink; The cooling air generated by the cooling fan flows along the heat sink and the light source, a reflector is provided to reflect light emitted from the light source; The reflector has an intake opening located below or above the cooling fan to take in cooling air generated by the cooling fan, The cooling air taken in through the intake opening flows toward the light source. Vehicle lighting fixtures.

3. The reflector is provided with a guide inclined surface for guiding the cooling air taken in through the intake opening, The inclined guide surface is inclined so as to approach the light source as it moves away from the cooling fan in the vertical direction.

3. A vehicle lamp according to claim 2.

4. The reflector is made of a metal material and is attached to the heat sink.

4. A vehicle lamp according to claim 2 or 3.

5. A circuit board on which a light source is mounted; a heat sink having a front or rear surface to which the circuit board is attached and which dissipates heat generated when the light source is driven; a cooling fan disposed above or below the circuit board and the heat sink; The cooling air generated by the cooling fan flows along the heat sink and the light source, A surface of the circuit board on which the light source is mounted is formed as a light source mounting surface, The circuit board is disposed with the light source mounting surface inclined toward the cooling fan side with respect to the vertical direction. Vehicle lighting fixtures.

6. A circuit board on which a light source is mounted; a heat sink having a front or rear surface to which the circuit board is attached and which dissipates heat generated when the light source is driven; a cooling fan disposed above or below the circuit board and the heat sink; The cooling air generated by the cooling fan flows along the heat sink and the light source, a projection lens that controls light emitted from the light source and a protector having a light shielding portion that blocks sunlight incident through the projection lens; The light shielding portion is provided as a guide portion for guiding the cooling air toward the projection lens. Vehicle lighting fixtures.

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