JP2018010783A - Head lamp of movable body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head lamp of a movable body which can efficiently cool a semiconductor laser despite having a simple and low cost structure.SOLUTION: A vehicle lamp fitting 10 includes: a semiconductor laser 11 serving as a light source; a heat sink 14 in which the semiconductor laser 11 is mounted on a mounting surface 14a which is opposite to a formation surface 14b of heat radiation fins 141; a reflection type wavelength conversion member 12 which converts laser light emitted from the semiconductor laser 11 into white scattering light and reflects the light; and a floodlight lens 13 which transmits the while scattering light and projects the light to the front side of the vehicle lamp fitting 10. The heat sink 14 is disposed so as to expose the heat radiation fins 141 to the front side on a front surface of the vehicle lamp fitting 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a moving headlamp that uses a semiconductor laser as a light source.

  As a headlamp for a moving body, for example, there is a vehicle lamp. Patent Documents 1 and 2 disclose a vehicular lamp using a semiconductor laser as a light source. The semiconductor laser generates heat and rises in temperature when energized (used). In addition, the semiconductor laser has the property that the light emission characteristic (output) decreases as the temperature rises. Furthermore, if the temperature exceeds a certain range, it may cause a failure. For this reason, when using a semiconductor laser as a light source of a vehicle lamp, it is necessary to take measures for cooling the semiconductor laser.

  In Patent Document 1, a semiconductor light emitting element is disposed inside a casing, and an air guide duct is provided on the outside of the casing for flowing traveling air, and the semiconductor light emitting element is cooled by the traveling air flowing through the air guiding duct. A configuration for rotating a fan is disclosed.

  Patent Document 2 discloses a configuration in which laser light oscillated by a semiconductor laser is guided to a light emitting unit by an optical fiber, and the light emitting unit is disposed in a space surrounded by a reflecting mirror and a lens. In this configuration, the semiconductor laser serving as a heat generation source can be disposed outside the space surrounded by the reflecting mirror and the lens, so that the semiconductor laser can be disposed in a place where cooling is relatively easy.

Japanese Patent No. 4586144 JP 2014-157842 A

  However, in the configuration of Patent Document 1, it is necessary to provide a wind guide duct outside the casing or to use a fan having a rotating shaft that penetrates the casing. There is a problem that the score also increases. In the configuration of Patent Document 2, an optical fiber, a light emitting unit, and the like are required, and there are similar problems such as a complicated structure and an increased number of members. Due to these problems, in the configurations of Patent Documents 1 and 2, the vehicular lamp tends to be expensive.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a moving headlamp capable of efficiently cooling a semiconductor laser while having a simple and low-cost structure. .

  In order to solve the above-described problems, the present invention provides a moving headlamp that includes a semiconductor laser as a light source, and scatters a heat radiating portion on which the semiconductor laser is mounted and a laser beam emitted from the semiconductor laser. A conversion unit that converts light into light and a light projecting unit that projects the scattered light forward are provided, and the heat dissipation unit is exposed and disposed in front of the moving body.

  According to said structure, when using the headlamp of a moving body for the headlight etc. of a vehicle, for example, a driving | running | working wind comes directly to a thermal radiation part at the time of driving | running | working of a vehicle. For this reason, the semiconductor laser can be effectively cooled via the heat radiating portion. In addition, no components such as a fan or a Peltier element for cooling the semiconductor laser are required, the structure thereof is simple, and the moving headlight can be made low in cost and highly effective in cooling.

  In the moving body headlamp, the heat dissipating part has a fin or uneven surface, and the fin or uneven surface is formed on a side opposite to the mounting portion of the semiconductor laser. It can be set as the structure arrange | positioned exposed in front of a mobile body.

  According to said structure, since driving | running | working wind directly hits the surface of the fin provided in the thermal radiation part or the unevenness | corrugation, a higher cooling effect can be acquired.

  Moreover, the headlamp of the said moving body can be set as the structure further provided with the part which changes the optical path of the said laser beam.

  According to said structure, the optical path adjustment of a laser beam can be easily performed by providing the part which changes the optical path of a laser beam.

  In the moving headlamp, the converter may be configured to convert the wavelength of the laser light.

  According to said structure, white projection light can be obtained, for example using a blue semiconductor laser with high luminous efficiency.

  Moreover, in the said headlamp of a moving body, it can be set as the structure by which the said conversion part is mounted in the said thermal radiation part.

  According to said structure, a cooling measure can be taken not only for the semiconductor laser but also for the conversion unit by mounting the conversion unit on the heat dissipation unit.

  Moreover, the headlamp of the said moving body further has the path | route which lets external air pass, It can be set as the structure arrange | positioned so that the said conversion part may contact the said path | route.

  According to said structure, a driving | running | working wind comes to flow in a path | route at the time of driving | running | working of a mobile body. And since the conversion part is arrange | positioned so that a path | route may be contacted, it can cool effectively using driving | running | working wind.

  In addition, the headlamp of the moving body is configured to pass a path through which external air passes, an air volume sensor that is disposed in the path and detects an air volume, and supplies power to the semiconductor laser using a detection signal of the air volume sensor. It can be set as the structure provided with the control part to adjust.

  According to said structure, the driving | running | working state etc. of a moving body can be grasped | ascertained by monitoring the air volume of the wind which flows through a path | route with an air volume sensor. Then, when it is determined that the moving body is slow or stopped, the control unit can perform control to stop the power supply to the semiconductor laser and turn off the laser light. Thereby, the opportunity for a person to look directly at a laser beam can be reduced, and danger can be avoided from an eye-safe viewpoint.

  The moving headlamp includes a temperature sensor that directly or indirectly detects the temperature of the semiconductor laser, and a control unit that adjusts power supply to the semiconductor laser using a detection signal of the temperature sensor. It can be set as the structure provided with these.

  According to the above configuration, if the temperature of the semiconductor laser is monitored by the temperature sensor and the control unit decreases the power supply amount to the semiconductor laser when the temperature of the semiconductor laser reaches a certain temperature or more, the semiconductor An excessive temperature rise of the laser can be prevented.

  The moving body headlamp according to the present invention is arranged so that the heat radiating portion on which the semiconductor laser is mounted is exposed in front of the moving body. As a result, the wind directly hits the heat radiating part when the mobile body is traveling, and the semiconductor laser can be effectively cooled without using expensive parts with a simple structure. Play.

It is a figure which shows schematic structure of the vehicle lamp which concerns on Embodiment 1, (a) is a front view of a vehicle lamp, (b) is AA sectional drawing of (a). It is a perspective view which shows an example of the external appearance of the heat sink used with the vehicle lamp of FIG. It is a figure which shows the modification of the vehicle lamp which concerns on Embodiment 1, (a) is a front view of a vehicle lamp, (b) is AA sectional drawing of (a). It is a figure which shows the modification of the vehicle lamp which concerns on Embodiment 1, and is sectional drawing which looked at the vehicle lamp from upper direction. It is a figure which shows the modification of the vehicle lamp which concerns on Embodiment 1, and is sectional drawing which looked at the vehicle lamp from upper direction. It is a figure which shows the modification of the vehicle lamp which concerns on Embodiment 1, and is sectional drawing which looked at the vehicle lamp from upper direction. (A) is a top view of a heat sink, (b) is AA sectional drawing of (a), (c) is BB sectional drawing of (a). It is a figure which shows schematic structure of the vehicle lamp which concerns on Embodiment 2, (a) is a front view of a vehicle lamp, (b) is AA sectional drawing of (a). It is a figure which shows the modification of the vehicle lamp which concerns on Embodiment 2, (a) is a front view of a vehicle lamp, (b) is AA sectional drawing of (a). It is a figure which shows schematic structure of the vehicle lamp which concerns on Embodiment 3, (a) is a front view of a vehicle lamp, (b) is AA sectional drawing of (a). It is a figure which shows the modification of the vehicle lamp which concerns on Embodiment 3, (a) is a front view of a vehicle lamp, (b) is AA sectional drawing of (a). It is a figure which shows schematic structure of the vehicle lamp which concerns on Embodiment 4, (a) is a front view of a vehicle lamp, (b) is AA sectional drawing of (a). It is a figure which shows schematic structure of the vehicle lamp which concerns on Embodiment 5, (a) is a front view of a vehicle lamp, (b) is AA sectional drawing of (a). It is a figure which shows schematic structure of the vehicle lamp which concerns on Embodiment 6, (a) is a front view of a vehicle lamp, (b) is AA sectional drawing of (a). In the vehicle lamp which concerns on Embodiment 6, it is a figure which shows the structure which provided the temperature sensor in the heat sink.

[Embodiment 1]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating a schematic configuration of a vehicular lamp 10 according to the first embodiment, where (a) is a front view of the vehicular lamp 10 and (b) is a cross-sectional view taken along line AA in (a). It is sectional drawing seen from the top). The vehicular lamp 10 includes a semiconductor laser 11, a reflective wavelength conversion member (conversion unit) 12, a light projection lens (light projection unit) 13, a heat sink (heat radiation unit) 14, and a housing 15. . In the following explanation, the case where the headlamp of the moving body in the present invention is applied to a vehicular lamp is exemplified, but the moving body in the present invention is not limited to a vehicle.

  The semiconductor laser 11 is used as a light source of the vehicular lamp 10 and is, for example, a can type semiconductor laser that emits blue laser light having a wavelength of 430 to 470 nm. In the example of FIG. 1, two semiconductor lasers 11 having a diameter of 5.6 mm are used. The semiconductor laser 11 may include a collimating lens.

  The reflective wavelength conversion member 12 receives the laser light emitted from the semiconductor laser 11 and reflects it to the light projecting lens 13. At this time, the reflective wavelength conversion member 12 converts the laser light emitted from the semiconductor laser 11 into scattered light, changes the wavelength of the laser light, and converts the blue laser light emitted from the semiconductor laser 11 into white light. To do. The reflective wavelength conversion member 12 may be, for example, a YAG phosphor formed on an aluminum substrate.

  The light projection lens 13 projects the reflected light from the reflective wavelength conversion member 12 to the front of the vehicular lamp 10. The projection lens 13 may be a general resin lens, or may be a glass lens.

  The heat sink 14 is a metal heat sink excellent in thermal conductivity, and the semiconductor laser 11 can be mounted on the mounting surface 14a. The surface of the heat sink 14 opposite to the mounting surface 14a is a fin forming surface 14b, and a plurality of flat plate-shaped heat radiation fins 141 are provided on the fin forming surface 14b. The main surface of the heat radiation fin 141 is orthogonal to the fin forming surface 14b, and the plurality of heat radiation fins 141 are arranged in parallel to each other. The heat sink 14 dissipates heat generated from the semiconductor laser 11 to the outside and cools the semiconductor laser 11. FIG. 2 is a perspective view showing an example of the appearance of the heat sink 14.

  The housing 15 accommodates the semiconductor laser 11 and the reflective wavelength conversion member 12 therein, and an opening is formed on one surface thereof. The light projecting lens 13 and the heat sink 14 are fitted into the opening of the housing 15, and the interior space of the housing 15, the light projecting lens 13, and the heat sink 14 is in a pseudo-sealed state. For example, a rectangular parallelepiped shape can be used as the housing 15, but the shape is not particularly limited.

  Then, the arrangement | positioning relationship of each component in the vehicle lamp 10 is demonstrated. As described above, the light projecting lens 13 and the heat sink 14 are fitted and arranged on the front surface of the housing 15. In the following description, the side on which the light projecting lens 13 and the heat sink 14 are disposed is the front of the vehicular lamp 10.

  In the front view of the vehicular lamp 10 as seen from the front side, as shown in FIG. 1A, the light projecting lens 13 is disposed in the center, and the heat sinks 14 are disposed on both sides thereof. The heat sink 14 has the fin forming surface 14b facing forward and the mounting surface 14a of the semiconductor laser 11 facing backward. Thereby, the heat radiation fin 141 of the heat sink 14 is exposed to the outside of the housing 15, and the mounting surface 14 a and the semiconductor laser 11 are arranged inside the housing 15.

  The laser emission direction of the semiconductor laser 11 disposed on the mounting surface 14 a of the heat sink 14 is directed to the rear side of the vehicular lamp 10. A reflective wavelength conversion member 12 is disposed at the emission destination of the semiconductor laser 11. The reflection-type wavelength conversion member 12 is attached to a dedicated stand (not shown) inside the housing 15. Thereby, the laser light emitted from the semiconductor laser 11 is reflected so as to be folded forward by the reflective wavelength conversion member 12, passes through the light projection lens 13, and is projected forward of the vehicle lamp 10.

  In the vehicular lamp 10 according to the first embodiment, a part of the heat sink 14 on which the semiconductor laser 11 is mounted, that is, the heat radiation fin 141 of the heat sink 14 is disposed so as to be exposed to the outside of the housing 15. . For this reason, the heat generated from the semiconductor laser 11 can be effectively released to the outside via the heat sink 14. Further, when the vehicular lamp 10 is used for a vehicle headlight or the like, the traveling wind directly hits the heat dissipating fins 141 when the vehicle is traveling, so that the semiconductor laser 11 can be further effectively cooled.

  The vehicular lamp 10 according to the first embodiment also has a simple structure and does not require parts such as a cooling fan or a Peltier element. Therefore, the vehicular lamp 10 can be a low cost and high cooling effect.

  In the vehicular lamp 10 shown in FIG. 1, the arrangement and shape of the light projecting lens 13 and the heat sink 14 are merely examples, and the present invention is not limited to this. A modification of the arrangement and shape of the projection lens 13 and the heat sink 14 in the first embodiment will be described below.

  The vehicular lamp 10 shown in FIG. 1 has a projection lens 13 disposed in the center and heat sinks 14 disposed on both sides thereof in a front view (see FIG. 1A) viewed from the front side. On the other hand, in the vehicular lamp 10 shown in FIG. 3, the light projecting lens 13 is disposed on one side, and the heat sink 14 is disposed on one lateral side thereof. Thus, the light projection lens 13 may be disposed near the center of the vehicular lamp 10 or may be disposed close to one side.

  In the vehicular lamp 10 shown in FIG. 1, the mounting surface 14a and the fin forming surface 14b of the heat sink 14 are parallel to each other. The laser emission direction in the semiconductor laser 11 is orthogonal to the mounting surface 14 a, but the laser beam is emitted toward the reflective wavelength conversion member 12, so the mounting surface 14 a is orthogonal to the optical axis direction of the light projecting lens 13. Without being arranged slightly inclined. For this reason, the heat dissipating fins 141 arranged so as to be orthogonal to the fin forming surface 14b are not parallel to the optical axis direction of the light projecting lens 13, but are slightly inclined.

  In contrast, in the vehicular lamp 10 shown in FIG. 4, the mounting surface 14 a and the fin forming surface 14 b are formed in the heat sink 14 so as not to be parallel to each other. As a result, the laser light from the semiconductor laser 11 is emitted toward the reflective wavelength conversion member 12, while the heat radiation fin 141 can be arranged to be parallel to the optical axis direction of the light projecting lens 13. . As described above, by disposing the heat radiation fin 141 so as to be parallel to the optical axis direction of the light projecting lens 13, the traveling wind can easily flow through the gap between the heat radiation fins 141. Cooling can be performed more effectively.

  In the configuration of FIG. 4, the entire mounting surface 14 a is an inclined surface with respect to the optical axis direction of the light projecting lens 13. However, a concave or convex portion having an inclined surface is provided on the mounting surface 14 a, and the inclined surface is provided. Alternatively, the semiconductor laser 11 may be mounted. FIG. 5 shows a configuration in which a recess 142 having an inclined surface 142a is provided on the mounting surface 14a of the heat sink 14, and the semiconductor laser 11 is mounted on the inclined surface 142a. FIG. 6 shows a configuration in which a convex portion 143 having an inclined surface 143a is provided on the mounting surface 14a of the heat sink 14, and the semiconductor laser 11 is mounted on the inclined surface 143a. The inclined surfaces 142a and 143a can be inclined surfaces for the area where the semiconductor laser 11 is installed. Even in these configurations, the laser light from the semiconductor laser 11 is emitted toward the reflective wavelength conversion member 12, while the heat radiation fin 141 is arranged in parallel to the optical axis direction of the light projecting lens 13. Can do.

  Further, in the vehicular lamp 10 shown in FIG. 1, the fin forming surface 14b of the heat sink 14 is a vertical surface. However, as shown in FIGS. A slope that slopes may be provided (the fin forming surface 14b may be a slope that slopes in the vertical direction). 7A is a top view of the heat sink 14, FIG. 7B is a cross-sectional view taken along line AA in FIG. 7A, and FIG. 7C is a cross-sectional view taken along line BB in FIG. Thus, by providing a slope on the fin forming surface 14b of the heat sink 14, the traveling air can easily flow along the fin forming surface 14b, and the semiconductor laser 11 can be cooled more effectively.

[Embodiment 2]
FIG. 8 is a diagram showing a schematic configuration of the vehicular lamp 10 according to the second embodiment. FIG. 8A is a front view of the vehicular lamp 10, and FIG. 8B is a cross-sectional view taken along the line AA in FIG. FIG. In the first embodiment, light emitted from the semiconductor laser 11 is directly incident on the reflective wavelength conversion member 12. In contrast, as shown in FIG. 8, the vehicular lamp 10 according to the second embodiment has a reflection mirror 16 disposed between the semiconductor laser 11 and the reflective wavelength conversion member 12, and In this configuration, the emitted light is reflected by the reflection mirror 16 and then incident on the reflective wavelength conversion member 12.

  The reflection mirror 16 is disposed on the rear side of the semiconductor laser 11 and on the front side of the reflective wavelength conversion member 12. The light emitted from the semiconductor laser 11 is reflected by the reflection mirror 16 and the reflective wavelength conversion member 12 and then projected forward from the light projecting lens 13. As the reflection mirror 16, a general aluminum mirror can be used. The reflection mirror 16 preferably has an angle adjustment function so that the angle can be adjusted in the housing 15.

  In the vehicular lamp 10 according to the second embodiment, the optical path of the laser light applied to the reflective wavelength conversion member 12 is provided by disposing the reflective mirror 16 between the semiconductor laser 11 and the reflective wavelength conversion member 12. Adjustment can be performed easily.

  In the vehicular lamp 10 shown in FIG. 8, in the front view (see FIG. 8A) viewed from the front side, the light projecting lens 13 is disposed in the center, and the heat sinks 14 are disposed on both sides thereof. On the other hand, in the vehicular lamp 10 shown in FIG. 9, the light projecting lens 13 is disposed on one side, and the heat sink 14 is disposed on one lateral side thereof. Thus, the light projection lens 13 may be disposed near the center of the vehicular lamp 10 or may be disposed close to one side.

[Embodiment 3]
10A and 10B are diagrams showing a schematic configuration of the vehicular lamp 10 according to the third embodiment. FIG. 10A is a front view of the vehicular lamp 10, and FIG. 10B is a cross-sectional view taken along line AA in FIG. FIG. In the first and second embodiments, in order to obtain white projection light, the blue laser light emitted from the semiconductor laser 11 is converted into white light when reflected by the reflective wavelength conversion member 12 to the front side. On the other hand, as shown in FIG. 10, the vehicular lamp 10 according to the third embodiment has a configuration using a transmissive wavelength conversion member instead of a reflective wavelength conversion member in order to obtain white projection light. is there.

  The vehicular lamp 10 according to the third embodiment includes a semiconductor laser 11, a reflection mirror 17, a transmissive wavelength conversion member (converter) 18, a light projecting lens 13, a heat sink 14, and a housing 15. ing.

  As in the first and second embodiments, the laser emission direction of the semiconductor laser 11 faces the rear side of the vehicular lamp 10. For this reason, the reflection mirror 17 is disposed at the emission destination of the semiconductor laser 11 to reflect the laser beam emitted from the semiconductor laser 11 so as to be folded forward.

  In addition, a transmissive wavelength conversion member 18 is disposed between the reflection mirror 17 and the projection lens 13, and light emitted from the semiconductor laser 11 (blue laser light) is scattered by being transmitted through the transmissive wavelength conversion member 18. It is converted into light and wavelength converted into white light. As the transmissive wavelength conversion member 18, for example, a sapphire substrate on which a YAG phosphor is formed can be used.

  In the vehicular lamp 10 shown in FIG. 10, in a front view (see FIG. 10A) viewed from the front side, the light projecting lens 13 is disposed in the center, and the heat sinks 14 are disposed on both sides thereof. On the other hand, in the vehicular lamp 10 shown in FIG. 11, the light projecting lens 13 is disposed on one side, and the heat sink 14 is disposed on one lateral side thereof. Thus, the light projection lens 13 may be disposed near the center of the vehicular lamp 10 or may be disposed close to one side.

[Embodiment 4]
In the first to third embodiments, the laser light emitted from the semiconductor laser 11 is blue laser light, the wavelength of the blue laser light is converted by a wavelength conversion member, and the white light is projected outside the vehicle lamp 10. . At this time, the temperature of the wavelength conversion member is likely to increase due to the irradiation of the laser light, and the light conversion efficiency of the YAG phosphor decreases when the temperature of the wavelength conversion member increases excessively. For this reason, in the fourth embodiment, not only the semiconductor laser 11 but also the wavelength conversion member can be cooled (heat radiation) by the heat sink 14.

  12A and 12B are diagrams showing a schematic configuration of the vehicular lamp 10 according to the fourth embodiment. FIG. 12A is a front view of the vehicular lamp 10, and FIG. 12B is a cross-sectional view taken along line AA in FIG. FIG. The vehicular lamp 10 according to the fourth embodiment includes a semiconductor laser 11, a reflection mirror 19, a reflection wavelength conversion member (conversion unit) 20, a reflector 21, a transparent cover (light projection unit) 22, a heat sink 14, and a housing. 15. In the vehicular lamp 10 shown in FIG. 12, the heat sink 14 is arranged on one side with respect to the transparent cover 22 in a front view (see FIG. 12A) viewed from the front side.

  In the vehicular lamp 10 shown in FIG. 12, the heat sink 14 has a substantially L-shaped cross section when viewed from above, a mounting surface 14 a on which the semiconductor laser 11 is mounted, and a fin on which the heat radiation fin 141 is formed. The formation surface 14 b is a surface parallel to the main surface of the transparent cover 22. Further, although the reflective wavelength conversion member 20 is also mounted on the heat sink 14, the mounting surface 14 c on which the reflective wavelength conversion member 20 is mounted is a surface orthogonal to the main surface of the transparent cover 22.

  The laser emission direction of the semiconductor laser 11 is directed to the rear side of the vehicular lamp 10 as in the first to third embodiments. The laser light emitted from the semiconductor laser 11 is reflected by the reflection mirror 19 and is incident on the reflective wavelength conversion member 20. In the configuration of FIG. 12, two reflection mirrors 19 are used for one semiconductor laser 11, and the reflection mirror 19 is adjusted and arranged so that the laser light is irradiated to the reflection type wavelength conversion member 20. The number of reflection mirrors 19 to be used is not particularly limited.

  In the arrangement of the reflective wavelength conversion member 20 and the heat sink 14 shown in FIG. 12, the central axis (optical axis) of the reflective wavelength conversion member 20 and the central axis (optical axis) of the transparent cover 22 cannot be matched. A reflector 21 is disposed on the optical path between the reflective wavelength conversion member 20 and the transparent cover 22. That is, the reflected light from the reflective wavelength conversion member 20 is further reflected by the reflector 21, then passes through the transparent cover 22 and is projected to the front of the vehicle lamp 10. As the reflector 21, a general metal reflector can be used. When the reflector 21 is disposed on the optical path between the reflection mirror 19 and the reflective wavelength conversion member 20, a through hole is provided in the reflector 21, and the optical path is secured by passing the laser beam through the through hole. You may do it. In the configuration of FIG. 12, a flat transparent cover 22 is used in place of the light projecting lens 13 in the first to third embodiments by using the reflector 21 having a concave mirror shape.

[Embodiment 5]
In the fourth embodiment, not only the semiconductor laser 11 but also the wavelength conversion member can be cooled (heat radiation) by the heat sink 14. In contrast, the fifth embodiment cools (dissipates) the wavelength conversion member with a configuration different from that of the fourth embodiment.

  13A and 13B are diagrams showing a schematic configuration of the vehicular lamp 10 according to the fifth embodiment. FIG. 13A is a front view of the vehicular lamp 10, and FIG. 13B is a cross-sectional view taken along line AA in FIG. FIG. The vehicle lamp 10 shown in FIG. 13 illustrates a configuration in which a ventilation path 23 is added to the vehicle lamp 10 shown in FIG.

  The ventilation path (path through which external air passes) is a tubular member having a plurality of bent portions, and includes an intake port 23a that opens on the front surface of the housing 15 and an exhaust port 23b that can exhaust to the outside. It is set as the structure which can ventilate external air. Although the location where the exhaust port 23b is formed is not particularly limited, the exhaust port 23b is formed at a position where the traveling wind easily flows through the ventilation path 23 when the vehicle mounted with the vehicle lamp 10 is traveling.

  The reflective wavelength conversion member 12 is disposed so as to contact the outer wall of the ventilation path 23. Thereby, in the vehicular lamp 10 according to the fifth embodiment, the reflective wavelength conversion member 12 can be effectively cooled by the traveling wind.

[Embodiment 6]
It is dangerous for a person to look directly at the laser beam emitted from the semiconductor laser 11 because it may cause blindness. In the vehicular lamp according to the first to fifth embodiments, the laser light is projected to the outside in a state of being scattered light through the wavelength conversion member. For this reason, the laser beam of the semiconductor laser 11 used as the light source hardly comes out directly. However, from the viewpoint of eye-safety, it is preferable to further reduce the chance that a person views the laser beam directly.

  The possibility that a person will look directly at the laser beam is low when the vehicle is traveling normally, and is high when the vehicle is slowing down or stopped. For this reason, the vehicular lamp 10 according to the sixth embodiment is characterized in that the traveling state of the vehicle is grasped and the semiconductor laser is controlled according to the traveling state.

  14A and 14B are diagrams showing a schematic configuration of the vehicular lamp 10 according to the sixth embodiment. FIG. 14A is a front view of the vehicular lamp 10, and FIG. 14B is a cross-sectional view taken along line AA in FIG. FIG. The vehicle lamp 10 shown in FIG. 14 illustrates a configuration in which a ventilation path (path through which external air passes) 24 and an air volume sensor 25 are added to the vehicle lamp 10 shown in FIG. Furthermore, the vehicular lamp 10 shown in FIG. 14 has a semiconductor laser power supply control system (not shown) that can adjust the power supply amount to the semiconductor laser 11 using the detection signal of the air volume sensor 25.

  The ventilation path 24 includes an intake port 24a that opens on the front surface of the housing 15, and an exhaust port 24b that can exhaust to the outside. A general air volume sensor 25 that can convert a small air volume into a signal is disposed inside the ventilation path 24. The ventilation path 24 is preferably a straight pipe type in which traveling wind can easily flow, but may be bent. The air volume sensor 25 may be disposed inside the ventilation path 23 in FIG.

  In the vehicular lamp 10 shown in FIG. 14, the running state can be grasped by monitoring the air volume of the running wind flowing through the ventilation path 24 with the air volume sensor 25. For example, when the air volume is large, it can be determined that the vehicle is in a normal traveling state, and when the air volume is small (below a certain value), it can be determined that the vehicle is running slowly or stopped.

  When it is determined that the vehicle is slowing down or stopped, the semiconductor laser power supply control system stops power supply to the semiconductor laser 11 and turns off the laser light. Thereby, the opportunity to look directly at the laser beam can be reduced, and danger can be avoided from the viewpoint of eye-safety.

  Further, the semiconductor laser power supply control system may control the power supply amount by temperature. For example, as shown in FIG. 15, a temperature sensor 26 capable of converting the temperature into a signal is installed on the mounting surface 14 a of the semiconductor laser 11 in the heat sink 14, and the semiconductor laser power supply control system is based on the detection signal of the temperature sensor 26. 11 so that the power supply amount to 11 can be adjusted. Note that the type and location of the temperature sensor 26 are not particularly limited as long as the temperature sensor 26 can detect the temperature of the semiconductor laser 11 directly or indirectly.

  The semiconductor laser 11 generates heat and rises in temperature when energized (used). When the temperature exceeds a certain range, the characteristic (output) of the semiconductor laser 11 is deteriorated, which may cause a failure. If the temperature of the semiconductor laser 11 is monitored by the temperature sensor 26, for example, when the cooling mechanism by the traveling wind is damaged and the temperature of the semiconductor laser 11 reaches a certain temperature or more, the semiconductor laser power supply control system applies to the semiconductor laser 11. Thus, an excessive increase in temperature of the semiconductor laser 11 can be prevented.

  The embodiments disclosed herein are illustrative in all respects and do not serve as a basis for limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. Moreover, all the changes within the meaning and range equivalent to a claim are included.

10 Vehicle lamps (moving body headlamps)
11 Semiconductor laser 12, 20 Reflective wavelength conversion member (conversion unit)
13 Projection lens (projection unit)
14 Heat sink (heat dissipation part)
14a (Semiconductor Laser) Mounting Surface 14b Fin Formation Surface 14c (Reflective Wavelength Conversion Member) Mounting Surface 141 Heat Dissipation Fin 15 Housing 16 Reflection Mirrors 17, 19 Reflection Mirror 18 Transmission Wavelength Conversion Member (Conversion Unit)
21 Reflector 22 Transparent cover (light emitting part)
23, 24 Ventilation path (path through which external air passes)
25 Airflow sensor 26 Temperature sensor

Claims (8)

A moving headlamp equipped with a semiconductor laser as a light source,
A heat dissipating part for mounting the semiconductor laser;
A converter for converting laser light emitted from the semiconductor laser into scattered light;
A light projecting unit that projects the scattered light forward;
The moving body headlamp is characterized in that the heat dissipating part is exposed and arranged in front of the moving body. A moving headlamp according to claim 1,
The heat dissipating part has a fin or uneven surface, and the fin or uneven surface is formed on a side opposite to the mounting portion of the semiconductor laser, and the fin or uneven surface is exposed in front of the moving body. A moving headlight characterized by that. A headlamp for a moving body according to claim 1 or 2,
The moving headlamp further comprising a portion for changing the optical path of the laser beam. A headlamp for a moving body according to any one of claims 1 to 3,
The said conversion part converts the wavelength of the said laser beam, The moving headlamp characterized by the above-mentioned. A headlamp for a moving body according to any one of claims 1 to 4,
The moving unit headlamp, wherein the heat radiating unit includes the conversion unit. A headlamp for a moving body according to any one of claims 1 to 5,
Further having a path for external air to pass through;
The said conversion part is arrange | positioned so that the said path | route may be contacted, The moving headlamp characterized by the above-mentioned. A headlamp for a moving body according to any one of claims 1 to 6,
A path through which external air passes;
An air volume sensor arranged in the path for detecting the air volume;
And a control unit that adjusts power supply to the semiconductor laser using a detection signal of the air volume sensor. A headlamp for a moving body according to any one of claims 1 to 6,
A temperature sensor for directly or indirectly detecting the temperature of the semiconductor laser;
And a control unit that adjusts power supply to the semiconductor laser using a detection signal of the temperature sensor.

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