JP5909699B2 - Vehicle headlamp - Google Patents

Description

  The present invention relates to a vehicle headlamp mounted on a vehicle.

  The LED light source can emit light with high power and high luminance, and has recently been used as a light source for a vehicle headlamp mounted on a vehicle. As an example thereof, an LED light source, a main body that holds the LED light source so that its optical axis is directed forward (horizontal), and a first reflector that is attached to the main body and reflects light from the LED light source upward Are known (for example, see Patent Document 1). The vehicular headlamp includes a second reflector that is attached to the upper surface of the main body and reflects light from the first reflector to the front. The light reflected by the second reflecting plate is emitted outside from the vehicle headlamp in a predetermined pattern.

  By the way, in a vehicle headlamp, when the light source is turned on, the air in the headlamp is warmed and expanded by heat from the light source, and when the light source is turned off, the air in the headlamp is cooled and contracted. In order to eliminate the pressure difference from the outside caused by the expansion and contraction of the air, a vehicular headlamp is generally provided with a vent hole communicating with the outside.

JP 2009-259667 A

  However, in the vehicle headlamp described in the above-mentioned patent document, when moist air enters the headlamp from the vent hole when the LED light source is turned off, moisture in the air is transferred to the second reflector. Condensation may occur, and water generated by condensation may flow in the vicinity of the LED light source through the second reflector. Therefore, there is a possibility that the LED light source gets wet and a problem occurs in the LED light source.

  The present invention solves the above-described problem, and in a vehicle headlamp mounted on a vehicle, even when condensation occurs in the headlamp, the problem of the LED light source due to water generated by the condensation is achieved. An object of the present invention is to provide a vehicular headlamp that can prevent the above.

The vehicle headlamp of the present invention has an LED light source, a main body having a mounting surface on which the LED light source is mounted, an opening on the other side that covers the LED light source attached to the mounting surface from one side, A first reflecting plate that reflects light from the LED light source in a direction orthogonal to the optical axis direction of the LED light source and exits from the opening, and a side surface of the main body so as to cover the opening of the first reflecting plate A second reflector that reflects light emitted from the opening in the direction of the optical axis and emits the light to the outside in a predetermined pattern, and partitions the opening of the first reflector and the side surface of the main body And a ridge that is attached to the mounting surface and protrudes toward the second reflecting plate from the side of the main body.

  It is preferable that the main body has a concave line portion extending in parallel with the mounting surface on a side surface between the convex line portion and the second reflecting plate.

  The first reflector preferably has a slit at the end opposite to the opening.

  It is preferable that the first reflecting plate is mounted on the mounting surface so that the opening faces downward.

  The first reflecting plate preferably includes a support that is resin-molded into a predetermined shape, and a light reflection layer that is provided on a surface of the support on which light from the LED light source is incident.

  The vehicle headlamp is attached to the mounting surface so as to surround a side periphery of the LED light source, and reflects the light emitted from the LED light source to the side thereof in the direction of the first reflecting plate. The third reflector comprises: a support body resin-molded into a predetermined shape; and a light reflection layer provided on a surface of the support body on which light from the LED light source is incident. It is preferable that the first reflecting plate is integrally molded with the resin.

  The vehicle headlamp preferably further includes a drive circuit that controls the lighting of the LED light source, and the drive circuit is preferably built in the main body.

  The vehicle headlamp preferably further includes a heat radiating body attached to the main body for radiating heat from the LED light source.

  The drive circuit is preferably built in the heat radiating body.

  The vehicle headlamp includes a plurality of light source units including the LED light source and the first reflector, and each of the plurality of light source units is mounted on the mounting surface so as to emit light in different directions. The second reflecting plate is preferably provided over the entire circumference of the main body.

  According to the present invention, even if condensation occurs on the second reflecting plate and the water generated by the condensation falls to the main body through the second reflecting plate, the water is blocked by the ridges. Therefore, it becomes difficult to flow in the vicinity of the LED light source. Therefore, it is possible to make it difficult for the LED light source to malfunction due to water generated by condensation.

1 is a side sectional view of a vehicle headlamp according to an embodiment of the present invention. The front view which looked at the said vehicle headlamp from the direction of the arrow shown in FIG. The perspective view which looked at the said vehicle headlamp from the front side, and its partially expanded view. The perspective view which looked at the said vehicle headlamp from the rear side. The perspective view of the vehicle headlamp which concerns on other embodiment. Furthermore, the perspective view of the vehicle headlamp which concerns on other embodiment. The sectional side view of the said vehicle headlamp. The sectional side view of the vehicle headlamp which concerns on the modification of the said embodiment. (A) is a front view of the vehicle headlamp which concerns on other embodiment, (b) is a perspective view of the 1st reflecting plate which comprises the vehicle headlamp. (A) is a side sectional view of a vehicle headlamp according to still another embodiment, (b) is a side sectional view of a first reflector and a third reflector constituting the vehicle headlamp, (C) is the figure which looked at the 1st reflecting plate and the 3rd reflecting plate from the direction of the arrow shown in (b). The front view of the vehicle headlamp which concerns on other embodiment. (A) (b) is a front view of the vehicle headlamp which concerns on other embodiment, respectively. Furthermore, the sectional side view of the vehicle headlamp which concerns on other embodiment. The front view which looked at the said vehicle headlamp from the direction of the arrow shown in FIG. (A) (b) is a circuit diagram with respect to the LED light source which each comprises the said vehicle headlamp. The front view of the vehicle headlamp which concerns on other embodiment. The circuit diagram with respect to the LED light source which comprises the said vehicle headlamp. The front view of the vehicle headlamp which concerns on other embodiment. (A) (b) is a front view of the vehicle headlamp which concerns on the modification of the said embodiment, respectively.

  A vehicle headlamp according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. In FIG. 1, the upward and downward directions on the paper indicate the upward and downward directions of the vehicle headlamp 1, respectively, and the left and right directions on the paper indicate the backward and forward directions of the vehicle headlamp 1, respectively. . In FIG. 2, the upward direction, the downward direction, the left direction, and the right direction on the paper indicate the upward direction, the downward direction, the left direction, and the right direction of the vehicle headlamp 1, respectively.

  The vehicle headlamp 1 includes an LED light source 2 and a main body 3 that holds the LED light source 2. The main body 3 is formed in a flat rectangular parallelepiped shape having a hollow inside, and the four side surfaces thereof are arranged so as to face the vertical and horizontal directions, respectively. One end surface of the main body 3 is a mounting surface 3A on which the LED light source 2 is mounted. The LED light source 2 is mounted on the mounting surface 3A so that its optical axis Ax coincides with the front-rear direction. The main body 3 is made of a material having a predetermined rigidity and excellent thermal conductivity, for example, aluminum. Moreover, it is preferable that at least the mounting surface 3A of the main body 3 is configured to have high light reflectivity.

  Further, the vehicle headlamp 1 further includes a first reflecting plate 4 that reflects light from the LED light source 2 and a second reflecting plate 4 that further reflects the light from the second reflecting plate 4 and emits the light to the outside in a predetermined pattern. 2 reflectors 5. The first reflecting plate 4 has a (1/4) ellipsoidal surface shape obtained by dividing the ellipsoidal surface by a plane passing through the major axis and the minor axis and further dividing the ellipsoidal surface into two equal parts in the major axis direction. It has become. The first reflecting plate 4 is attached to the mounting surface 3A so as to cover the LED light source 2 from below with its light reflecting surface, and has an opening 41 at the upper end. In the illustrated example, the first reflecting plate 4 is attached to the mounting surface 3 </ b> A so that the opening 41 is positioned closer to the second reflecting plate 5 than the upper surface 31 of the main body 3. The first reflector 4 reflects light from the LED light source 2 upward perpendicular to the optical axis Ax direction (front-rear direction), and emits the reflected light from the opening 41 toward the second reflector 5. .

  The second reflecting plate 5 has a bowl shape, and its concave surface is a light reflecting surface. The second reflecting plate 5 is attached over the entire side surface of the main body 3 so that the light reflecting surface covers the opening 41 of the first reflecting plate 4. The second reflecting plate 5 reflects the light emitted from the opening 41 of the first reflecting plate 4 in the optical axis Ax direction (forward). The light reflected by the second reflecting plate 5 is emitted from the vehicle headlamp 1 as a low beam light slightly inclined downward with respect to the optical axis Ax (an example of an optical path in FIG. 1 is a one-dot chain line). Indicated by an arrow).

  The vehicular headlamp 1 partitions the opening 41 of the first reflecting plate 4 and the upper surface 31 of the main body 3 and projects from the upper surface 31 of the main body 3 toward the second reflecting plate 5. 6 is provided. In the illustrated example, the ridge 6 is a long and thin plate-like member, and the mounting surface 3 </ b> A extends in the left-right direction of the opening 41 so that the upper end thereof is at the same height as the opening 41 of the first reflecting plate 4. Is attached. The ridge 6 is made of a translucent material, for example, a transparent acrylic resin or a transparent polycarbonate resin.

  Further, the vehicle headlamp 1 includes a heat radiating body 7 for radiating heat from the LED light source 2. The radiator 7 is attached to the surface of the main body 3 opposite to the mounting surface 3A. The heat radiating body 7 has a plurality of heat radiating fins and is made of a material having excellent thermal conductivity, for example, aluminum or copper. A connector 71 used for electrical connection with an external device is provided on the outer surface of the radiator 7. The connector 71 is connected to the LED light source 2 by a distribution line, and is connected to, for example, an external drive circuit that controls the lighting of the LED light source 2.

  The LED light source 2 includes a large number of LEDs arranged in a matrix. Each LED is configured by, for example, a white LED that emits white light. The white LED has, for example, a GaN-based blue LED chip that emits blue light and a yellow phosphor that emits yellow light when excited by the blue light from the LED chip. White light is emitted by mixing the colors.

  The first reflecting plate 4 and the second reflecting plate 5 are made of a metal material having a predetermined rigidity and excellent in light reflectivity and heat conductivity, for example, aluminum. The light reflecting surface of the second reflecting plate 5 is divided into a plurality of light reflecting surfaces by a plurality of slits 51. In order to reflect light in a predetermined pattern, the plurality of light reflecting surfaces have, for example, inclinations and irregularities made up of a large number of rectangular light reflecting surfaces. Each of the light reflecting surfaces has a surface for condensing light and a surface for diffusing the light, and is configured to synthesize and emit the light generated on these surfaces. In addition, each light reflecting surface is arranged with a step with respect to the light reflecting surface adjacent to itself in order to prevent color variation and color unevenness when combining light.

  Moreover, the 1st reflecting plate 4 and the 2nd reflecting plate 5 have a some radiation fin (not shown) in the surface on the opposite side to those light reflection surfaces, respectively. Since such a radiation fin is provided on the surface opposite to the light reflecting surface, it does not affect the light reflection.

  According to the vehicle headlamp 1 of the present embodiment, condensation occurs on the light reflecting surface of the second reflecting plate 5, and water produced by the condensation travels along the light reflecting surface of the second reflecting plate 5. Even if it falls to the direction, the water is blocked by the ridges 6 so that it is difficult to flow into the vicinity of the LED light source 2. Therefore, the malfunction of the LED light source 2 due to water generated by condensation can be prevented.

  In addition, since the main body 3 on which the LED light source 2 is mounted and the second reflector 5 attached to the main body 3 are both made of a material having excellent thermal conductivity, the heat from the LED light source 2 causes the main body 3 to be heated. Heat is transferred to the second reflecting plate 5 through. Thereby, since the 2nd reflecting plate 5 is warmed, the dew condensation on the 2nd reflecting plate 5 becomes difficult to occur, and the fall of the water droplet from the 2nd reflecting plate 5 can be decreased.

  In addition, since a plurality of heat radiation fins are provided on the surface opposite to the light reflecting surfaces of the second reflecting plate 5 and the first reflecting plate 4, the heat from the LED light source 2 passes through the main body 3. Heat can be transferred to the second reflector 5 and the first reflector 4 to dissipate heat. Therefore, compared with the case where only the heat radiating body 7 is provided as a heat radiating member, the size of the heat radiating body 7 can be reduced, and thereby the vehicle headlamp 1 can be reduced in size and weight.

  Further, the light from the LED light source 2 is reflected upward by the first reflector 4 perpendicular to the light emission direction (front) of the vehicle headlamp 1, thereby increasing the light path length and increasing the light emission range. doing. Therefore, the vehicle headlamp 1 can be made thin by reducing the depth compared to the vehicle headlamp in which the optical path of the light emitted from the light source extends in the front-rear direction while increasing the light emission range. Can do.

  Further, since the mounting surface 3A of the main body 3 is configured to have high light reflectivity, the light emitted from the LED light source 2 is reflected forward by the mounting surface 3A. Thereby, even when a part of the light reflected by the first reflecting plate 4 goes to the mounting surface 3A side, such light can be reflected again in the direction of the first reflecting plate 4 and the opening 41. The light use efficiency of the vehicle headlamp 1 can be improved.

  Next, a vehicle headlamp according to another embodiment will be described with reference to FIG. The vehicle headlamp 11 is provided with a wall 32 extending in parallel with the ridge portion 6 in contact with the ridge portion 6 on the upper surface 31 of the main body 3 of the vehicle headlamp 1 described above. In the illustrated example, the wall 32 is provided lower than the ridge 6 and longer than the ridge 6. The wall 32 dams up the water that has fallen along the second reflector 5 together with the ridge 6 so as not to flow into the vicinity of the LED light source 2. Note that the shape of the wall 32 is not limited to that shown in the drawing, and may be provided, for example, at a distance from the ridge 6, or may be provided across the entire width of the upper surface 31 in the left-right direction.

  According to the vehicle headlamp 11 of the present embodiment, the wall 32 blocks the water that has fallen along the second reflector 5 in addition to the ridges 6, so that it is compared with the vehicle headlamp 1. Thus, it is possible to prevent water from flowing around the LED light source 2 more efficiently.

  Next, a vehicle headlamp according to still another embodiment will be described with reference to FIGS. 6 and 7. The vehicular headlamp 12 further includes a groove 33 extending parallel to the mounting surface 3A between the wall 32 and the second reflecting plate 5 on the upper surface 31 of the main body 3 of the vehicular headlamp 11 described above. It is provided. In the example shown in the figure, two concave portions 33 are provided in parallel with each other over the full width in the left-right direction of the upper surface 31 and the full width in the vertical direction of the left side surface and right side surface of the main body 3. Such a concave line portion 33 functions as a water channel that allows water that has fallen along the second reflecting plate 5 to escape in a direction parallel to the mounting surface 3A. Note that only one recess 33 may be provided, three or more may be provided, or only the upper surface 31 of the main body 3 may be provided.

  The vehicle headlamp 12 includes a drive circuit 21 that controls the lighting of the LED light source 2. The drive circuit 21 is built in the main body 3 and connected to each of the LED light source 2 and the connector 71 by the distribution line 22. The drive circuit 21 is connected to the main body 3 by a heat transfer member 23 made of a material having excellent heat conductivity. The heat generated in the drive circuit 21 is transferred to the main body 3 and further to the heat radiating body 7 through the heat transfer member 23, and is finally radiated to the outside.

  According to the vehicle headlamp 12 of the present embodiment, the concave stripe portion 33 functions as a water channel for escaping water that has fallen along the second reflecting plate 5 in a direction parallel to the mounting surface 3A. Compared to the headlamp 11, it is difficult for water to reach the wall 32 and the ridge 6. Thereby, the flow of water around the LED light source 2 can be prevented more efficiently. In addition, since the drive circuit 21 that is separately provided in the vehicle headlamp 1 is built in the main body 3, the entire apparatus can be downsized as compared with the vehicle headlamp 1.

  Next, a vehicle headlamp according to a modification of the above embodiment will be described with reference to FIG. The vehicular headlamp 12a has a drive circuit 21 built in the radiator 7 instead of the main body 3 based on the vehicular headlamp 12 described above. The drive circuit 21 is connected to the radiator 7 by a heat transfer member 23. The heat generated in the drive circuit 21 is transferred to the heat radiating body 7 through the heat transfer member 23 and finally radiated to the outside.

  According to the vehicle headlamp 12a of this modification, the LED light source 2 and the drive circuit 21 are arranged at a distance from each other, so that heat is dispersed in the vehicle headlamp 12a and efficiently radiated. be able to.

  Next, a vehicle headlamp according to still another embodiment will be described with reference to FIGS. The vehicle headlamp 13 is different from the vehicle headlamp 1 in the structure of the first reflector 4. The first reflector 4 of the vehicle headlamp 13 has a slit 42 at the end opposite to the opening 41. In the illustrated example, the slit 42 is configured by an opening. By providing the slit 42, air flows around the LED light source 2 through the slit 42 and the opening 41. In addition, the slit 42 may be comprised by the cut | interruption put in the hole or the streak shape.

  According to the vehicle headlamp 13 of the present embodiment, air flows around the LED 2 light source, so that the LED light source 2 can be air-cooled. Further, even if water due to condensation climbs over the ridges 6 and enters the first reflector 4, such water escapes downward through the slits 42. Therefore, it is possible to prevent water from being stored inside the first reflector 4.

  Next, a vehicle headlamp according to still another embodiment will be described with reference to FIGS. The vehicle headlamp 14 is different from the vehicle headlamp 1 in the structure of the first reflector 4. The first reflector 4 of the vehicle headlamp 14 includes a support 43 that is resin-molded into a predetermined shape, and a light reflection layer 44 that is provided on the surface of the support 43 on which light from the LED light source 2 is incident. Have. The support 43 is made of a heat resistant resin such as a polycarbonate resin or an acrylic resin. The light reflection layer 44 is formed, for example, by depositing a metal such as silver or aluminum on the support 43 or by attaching a metal reflector to the support 43. The first reflecting plate 4 is provided so that the opening 41 is located on the mounting surface 3 </ b> A of the main body 3, and is separated from the ridge 6.

  The vehicle headlamp 14 further includes a third reflector 45 that reflects the light emitted from the LED light source 2 to the side in the direction of the first reflector 4. The third reflecting plate 45 has a truncated cone shape with both end faces open, and is attached to the mounting surface 3 </ b> A via the smaller opening while surrounding the side periphery of the LED light source 2. The third reflecting plate 45 includes a support 46 that is resin-molded into a predetermined shape, and a light reflection layer 47 that is provided on a surface of the support 46 where light from the LED light source 2 is incident. The support 46 and the light reflection layer 47 are made of the same material as the support 41 and the light reflection layer 47, respectively.

  The support 46 of the third reflecting plate 45 is resin-molded integrally with the support 43 of the first reflecting plate 4. The integrally molded member has a leg portion 48 for attaching itself to the mounting surface 3A on the surface in contact with the mounting surface 3A, and a claw 48a provided at the tip of the leg portion 48 is provided on the mounting surface 3A. It is attached to the main body 3 by being locked in the formed hole.

  According to the vehicle headlamp 14 of the present embodiment, the light emitted from the LED light source 2 to the side can be reflected by the third reflector 45 in the direction of the first reflector 4. The light utilization efficiency of the vehicle headlamp 14 can be improved. Moreover, since the 3rd reflecting plate 45 is arrange | positioned at the side periphery of the LED light source 2, even if the water by dew condensation climbs over the protruding item | line part 6 and enters in the 1st reflecting plate 4, it is the Such water is blocked by the third reflector 45 and does not reach the LED light source 2. Therefore, it is possible to prevent water from flowing around the LED light source 2 more efficiently than the vehicular headlamp 1. Furthermore, since the first reflecting plate 4 and the third reflecting plate 45 are integrally molded with each other, the positional accuracy of the third reflecting plate 45 with respect to the first reflecting plate 4 can be increased.

  Next, a vehicle headlamp according to still another embodiment will be described with reference to FIG. The vehicle headlamp 15 is different from the vehicle headlamp 1 in the shape of the main body 3. The main body 3 of the vehicle headlamp 15 has a cylindrical shape having a circular mounting surface 3A. According to the vehicle headlamp 15 of the present embodiment, water that has fallen on the upper surface 31 of the main body 3 through the second reflecting plate 5 quickly falls downward along the circumferential surface of the main body 3. Compared to the vehicular headlamp 1, it becomes difficult for water to flow into the vicinity of the LED light source 2.

  Next, a vehicle headlamp according to still another embodiment will be described with reference to FIGS. The vehicle headlamps 16a and 16b are different from each other in the shapes of the vehicle headlamp 15 and the second reflecting plate 5 described above. As shown in FIG. 12A, the second reflecting plate 5 of the vehicle headlamp 16 a is substantially rectangular when viewed from the mounting surface 3 </ b> A side of the main body 3. As shown in FIG. 12B, the second reflecting plate 5 of the vehicle headlamp 16 b has an elliptical shape when viewed from the mounting surface 3 </ b> A side of the main body 3. According to the vehicle headlamps 16 a and 16 b of the present embodiment, the same LED light source 2, main body 3, and first reflector 4 are used by changing the shape of the second reflector 5. However, the pattern of light emitted to the outside can be changed.

  Next, a vehicle headlamp according to still another embodiment will be described with reference to FIGS. As shown in FIGS. 13 and 14, the vehicle headlamp 17 reflects an LED light source 2 a different from the LED light source 2 and the light from the LED light source 2 a based on the vehicle headlamp 1 described above. And a first reflecting plate 4a. Hereinafter, the LED light source 2 and the first reflecting plate 4 are collectively referred to as a light source unit 8, and the LED light source 2a and the first reflecting plate 4a are collectively referred to as a light source unit 8a. The protruding portion 6 is provided integrally with the light source unit 8 and is not provided in the light source unit 8a.

  The LED light source 2 a has the same configuration as the LED light source 2. The LED light source 2a is mounted on the mounting surface 3A of the main body 3 so that its optical axis Ax coincides with the front-rear direction, and is disposed below the LED light source 2. The first reflecting plate 4a is attached to the mounting surface 3A so as to cover the LED light source 2a from above, and reflects the light from the LED light source 2a and emits it toward the second reflecting plate 5 from the lower end opening 41a. To do. The opening 41 a of the first reflecting plate 4 a is configured to be smaller than the opening 41 of the first reflecting plate 4.

  The light emitted from the opening 41a of the first reflecting plate 4a is reflected by the second reflecting plate 5 and becomes high beam light slightly tilted upward with respect to the optical axis Ax from the vehicle headlamp 17. The light is emitted (an example of an optical path in FIG. 13 is indicated by a two-dot chain line arrow). As already described, the light emitted from the opening 41 of the first reflecting plate 4 is reflected by the second reflecting plate 5 to be emitted as low beam light from the vehicle headlamp 17 (FIG. 13). In FIG. 1, an example of the optical path is indicated by a one-dot chain line arrow).

  As shown in FIG. 15A, the LED light sources 2 and 2a are connected to the drive circuit 21 in series. A switch 24 is provided in parallel with the LED light source 2a between the distribution line connecting the LED light sources 2 and 2a and the distribution line connecting the LED light source 2a and the drive circuit 21. When energized with the switch 24 turned on, only the LED light source 2 emits light and only the low beam light is emitted from the vehicle headlamp 17. When energized with the switch 24 turned off, both the LED light sources 2 and 2a emit light, and both low beam light and high beam light are emitted from the vehicle headlamp 17.

  Further, as shown in FIG. 15B, the LED light sources 2 and 2a may be connected in parallel to the drive circuit 21, respectively. A switch 24 is provided between the LED light source 2 and the drive circuit 21, and a switch 24 a is provided between the LED light source 2 a and the drive circuit 21. By turning on and off the switches 24 and 24a individually, lighting of the LED light sources 2 and 2a is controlled separately.

  According to the vehicle headlamp 17 of the present embodiment, the light emitted from each of the light source units 8 and 8a is reflected by the second reflecting plate 5 and becomes low beam light and high beam light, respectively. The headlight 17 can distribute light in two directions. The irradiation patterns of the low beam light and the high beam light can be individually controlled by turning on and off the switch 24 (and the switch 24a).

  In addition, by making the opening 41 of the first reflecting plate 4 large and the opening 41a of the first reflecting plate 4a small, the low beam light can be irradiated to a wide range, and the high beam light can travel far. It can be high light.

  Moreover, since both the light source units 8 and 8a are mounted on the mounting surface 3A of the main body 3, the light source units 8 and 8a can be attached to the main body 3 from one direction. The assembly operation is simple.

  Next, a vehicle headlamp according to still another embodiment will be described with reference to FIGS. 16 and 17. As shown in FIG. 16, the vehicle headlamp 18 includes four light source units 8a, 8b, 8c, and 8d. Each of these light source units 8a to 8d is mounted on the mounting surface 3A of the main body 3 so as to emit light in different directions. The main body 3 has a substantially rectangular shape when viewed from the mounting surface 3A side. The second reflecting plate 5 has a substantially rectangular shape similar to the main body 3 when viewed from the mounting surface 3A side.

  The light source unit 8a is the same as that of the vehicle headlamp 17, and emits high beam light. The light source unit 8b includes an LED light source 2b and a first reflecting plate 4b that reflects light from the LED light source 2b upward, and emits low beam light. The first reflecting plate 4b is configured by the first reflecting plate 4 of the vehicle headlamp 13 described above, and has a slit 42 at the lower end thereof. The light source unit 8c includes an LED light source 2c and a first reflecting plate 4c that reflects light from the LED light source 2c to the lower left, and emits high beam light that is irradiated to the lower left. The light source unit 8d includes an LED light source 2d and a first reflecting plate 4d that reflects light from the LED light source 2d to the lower right, and emits high beam light that is irradiated to the lower right. The ridge 6 is provided integrally with the light source unit 8b and is not provided in the light source units 8a, 8c, and 8d.

  As shown in FIG. 17, the LED light sources 2a to 2d are connected to the drive circuit 21 in parallel. Switches 24a to 24d are provided in the circuits of the LED light sources 2a to 2d, respectively. By individually turning on / off these switches 24a to 24d, the lighting of the LED light sources 2a to 2d is individually controlled.

  According to the vehicle headlamp 18 of the present embodiment, the low light beam from the LED light source 2b and the high beam light from the LED light sources 2a, 2c, and 2d are variously turned on and off individually. Various light distributions can be realized by combining these patterns.

  Next, a vehicle headlamp according to still another embodiment will be described with reference to FIG. The vehicle headlamp 19 is obtained by removing the light source unit 8 on the basis of the vehicle headlamp 17 and providing the ridge portion 6 on the light source unit 8a. The ridge 6 partitions the opening 41a of the first reflecting plate 4a from the lower surface of the main body 3, and protrudes from the lower surface of the main body 3 toward the second reflecting plate 5 side. In the illustrated example, the ridge 6 is provided across the left and right directions of the opening 41a of the first reflecting plate 4a, and is attached to the mounting surface 3A.

  According to the vehicle headlamp 19 of the present embodiment, the opening 41a of the first reflecting plate 4a faces downward, and the upper side of the LED light source 2a is closed by the first reflecting plate 4a. Therefore, even if dew condensation occurs at the upper end portion of the second reflecting plate 5 and the water generated by the dew condensation flows into the mounting surface 3A through the upper surface 31 of the main body 3, the water remains in the first reflecting plate 4a. It is blocked by the LED light source 2. Thereby, the malfunction of the LED light source 2 by dew condensation water can be prevented.

  In addition, since the ridge 6 is provided in the opening 41a of the first reflecting plate 4a, it is assumed that the condensed water accumulated at the lower end of the light reflecting surface of the second reflecting plate 5 repels upward due to vibration or the like. However, it is difficult for such water to enter the first reflector 4a. Thereby, the malfunction of the LED light source 2 by condensed water can be made hard to occur.

  Next, a vehicle headlamp according to a modification of the above embodiment will be described with reference to FIGS. As shown in FIG. 19A, the vehicle headlamp 19a is further provided with two light source units 8c and 8d based on the vehicle headlamp 19 described above. The light source units 8c and 8d are the same as those of the vehicle headlamp 18 described above. Since the openings of the light source units 8c and 8d both face obliquely downward, the dew condensation water that has fallen from above does not flow into the light source units 8c and 8d.

  According to the vehicle headlamp 19a of the present modification, the same effect as the vehicle headlamp 19 can be obtained. In addition, since the light emitted from the light source units 8c and 8d becomes high beam light that is emitted to the upper left and upper right, respectively, the high beam light can be emitted over a wider range than the vehicular headlamp 19.

  As shown in FIG. 19B, the vehicle headlamp 19b is positioned above the height between the upper surface 31 of the main body 3 and the light source units 8c and 8d based on the vehicle headlamp 19a. The second reflector 5 is removed. Since the light from the light source units 8a, 8c, 8d is emitted downward, to the lower left and to the lower right and reflected by the substantially lower half of the second reflecting plate 5, the upper portion of the second reflecting plate 5 is reflected. Even if it is removed, the outgoing light pattern is not affected.

  According to the vehicle headlamp 19b of this modification, the same effect as the vehicle headlamp 19a can be obtained, and condensed water itself from the upper end portion of the second reflector 5 can be eliminated. it can.

  The vehicle headlamp according to the present invention is not limited to the above-described embodiment, and various modifications can be made. For example, a vehicle headlamp need not necessarily include a heat radiator. Further, the ridge is not necessarily attached to the mounting surface of the main body, and may be provided at the end of the upper surface of the main body on the mounting surface side. In addition, the second reflecting plate is not necessarily provided over the entire side surface of the main body, and may be provided so as to cover at least the opening of the first reflecting plate. When a plurality of light source units are provided, the light source, the output, or the emission color of the LED light source may be different for each light source unit.

1, 11, 12, 12a, 13, 14, 15, 16a, 16b, 17, 18, 19, 19a, 19b Vehicle headlamp 2, 2a, 2b, 2c, 2d LED light source 21 Drive circuit 3 Main body 31 Main body Top surface (side)
33 concave portion 3A mounting surface 4, 4a, 4b, 4c, 4d first reflector 41, 41a (first reflector) opening 42 slit 43 (first reflector) support 44 (first Light reflecting layer 45 (third reflecting plate) third reflecting plate 46 (third reflecting plate) support 47 light reflecting layer 5 (third reflecting plate) second reflecting plate 6 ridge 7 radiating body 8, 8a, 8b, 8c, 8d Light source unit Ax Optical axis of LED light source

Claims (10)

An LED light source;
A main body having a mounting surface on which the LED light source is mounted;
It is attached to the mounting surface and covers the LED light source from one side and has an opening on the other side. Light from the LED light source is reflected in a direction perpendicular to the optical axis direction of the LED light source and emitted from the opening. A first reflector;
A second reflector that is attached to a side surface of the main body so as to cover the opening of the first reflector and reflects the light emitted from the opening in the direction of the optical axis and emits the light to the outside in a predetermined pattern;
And a convex portion which projects into the second reflector side of the side surface of the mounted on the mounting surface body and the side surface of said body and opening of the first reflector to the partition so that A vehicle headlamp characterized by that.   2. The vehicle headlamp according to claim 1, wherein the main body has a concave strip portion extending in parallel with the mounting surface on a side surface between the convex strip portion and the second reflecting plate.   The vehicular headlamp according to claim 1 or 2, wherein the first reflecting plate has a slit at an end opposite to the opening.   The vehicle headlamp according to claim 1 or 2, wherein the first reflecting plate is mounted on the mounting surface such that an opening thereof faces downward.   The first reflection plate includes a support body that is resin-molded into a predetermined shape, and a light reflection layer that is provided on a surface of the support body on which light from the LED light source is incident. The vehicle headlamp according to any one of claims 1 to 4. A third reflector that is attached to the mounting surface so as to surround a side periphery of the LED light source and reflects light emitted from the LED light source to the side thereof in the direction of the first reflector;
The third reflecting plate includes a support body resin-molded into a predetermined shape, and a light reflection layer provided on a surface of the support body on which light from the LED light source is incident. The vehicle headlamp according to claim 5, wherein the vehicle headlamp is integrally molded with a reflecting plate. A drive circuit for controlling the lighting of the LED light source;
The vehicle headlamp according to any one of claims 1 to 6, wherein the driving circuit is built in the main body.   The vehicular headlamp according to any one of claims 1 to 7, further comprising a heat radiating body attached to the main body for radiating heat from the LED light source.   The vehicle headlamp according to claim 8, wherein the drive circuit is built in the radiator. A plurality of light source units comprising the LED light source and the first reflector;
Each of the light source units is mounted on the mounting surface so as to emit light in different directions.
The vehicular headlamp according to any one of claims 1 to 9, wherein the second reflecting plate is provided over the entire circumference of the main body.

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