JP2016207485A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture capable of suppressing occurrence of glare.SOLUTION: A vehicular lighting fixture 1 includes: an LED 3 mounted on a substrate 4; and a reflector 5 on which an opening 5b through which light emitted from the LED 3 passes is formed. At least one part of an inner peripheral wall 5b1 of the opening 5b of the reflector 5 (portion opposing to a reflection surface 5a of the reflector 5) is made to be a curve surface, and a surface on which the LED 3 is mounted of the substrate 4 is made to be a low reflection ratio surface or/and a high absorption ratio surface. For example, at the surface (bottom surface) on which the LED 3 is mounted of the substrate 4, a black resist film 13 is formed.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a vehicular lamp using an LED (light emitting diode) as a light source.

  As light sources for vehicle lamps such as headlamps arranged on the left and right of the front part of the vehicle, LEDs having advantages such as high luminous efficiency, long life, and power saving are being used. Regarding the vehicular lamp using such an LED as a light source, Patent Documents 1 and 2 propose ones shown in FIGS. 9 to 11 as a configuration for preventing the occurrence of glare due to direct light from the LED.

  9 is a longitudinal sectional view of the vehicular lamp proposed in Patent Document 1, FIG. 10 is an enlarged perspective view of the main part of the vehicular lamp, and the vehicular lamp 101 shown in FIG. A lamp unit (DRL lamp) 105 is housed in the lower part of the lamp chamber 104 defined by the outer lens 103 covering the opening. The lamp unit 105 includes an LED 106 serving as a light source, a substrate 107 on which the LED 106 is mounted, and a reflector 108 that reflects light emitted upward from the LED 106 and emits the light forward. Here, as shown in FIG. 10, the bottom plate of the reflector 108 is formed with a substantially circular opening 10108a through which light emitted from the LED 106 passes, and a part of this opening 108a is formed. Is formed with a tongue 108b protruding toward the center. As shown in FIG. 9, the tongue portion 108 b extends to a straight line L connecting the center of the LED 106 and the front end edge of the reflector 108.

  In such a vehicular lamp 101, direct light that is not reflected by the reflector 108 out of the light emitted from the LED 106 is blocked by the tongue 108b that protrudes into the opening 108a of the reflector 108, so that the occurrence of glare due to direct light is suppressed. It is done.

  FIG. 11 is an enlarged perspective view of a main part of the vehicular lamp proposed in Patent Document 2. In the illustrated vehicular lamp, light is emitted from each of the LEDs 202 and 203 to a portion close to the LEDs 202 and 203 of the reflector 201. Light shielding members 204 and 205 for shielding direct light are provided, respectively, and the occurrence of glare due to direct light is suppressed by these light shielding members 204 and 205.

JP 2013-175334 A JP 2008-243476 A

  However, in the vehicle lamp 101 shown in FIGS. 9 and 10 proposed in Patent Document 1, the vertical wall of the tongue 108b formed in the opening 108a of the reflector 108 forms a vertical surface. As shown in FIG. 9, the direct light from the LED 103 is reflected by the vertical wall of the tongue portion 108b (see FIG. 10) and directed to the reflecting surface 108c of the reflector 108, and is reflected by the reflecting surface 108c and forward (leftward in FIG. 9). ), And this light causes glare.

  In the vehicular lamp shown in FIG. 11 proposed in Patent Document 2, even if the occurrence of glare is suppressed by the light shielding members 204 and 205, a part of the light directly reflected by the reflecting surface 201a of the reflector 201 is also a light shielding member. Since it is interrupted by 204 and 205, there exists a problem that the amount of reflected light is reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicular lamp that can suppress the occurrence of glare.

  In order to achieve the above object, an invention according to claim 1 is a vehicle lamp comprising an LED mounted on a substrate and a reflector in which an opening through which light emitted from the LED passes is formed. The inner peripheral wall of at least a part of the part is a curved surface, and the surface of the substrate on which the LED is mounted is a low reflectance surface and / or a high absorptance surface.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, a portion of the inner peripheral wall of the opening of the reflector facing the reflecting surface of the reflector is a curved surface.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a black resist film is formed on a surface of the substrate on which the LED is mounted.

  According to the present invention, the direct light emitted from the LED is reflected by the curved surface formed on at least a part of the inner peripheral wall of the opening formed in the reflector (the part facing the reflecting surface of the reflector), so that the LED on the substrate Since it faces the mounted low reflectance surface (black resist film) and / or high absorptivity surface and is absorbed by the low reflectance surface or / and the high absorptivity surface, the occurrence of glare due to direct light can be suppressed. .

It is a perspective view of the vehicular lamp main part concerning the present invention. It is a disassembled perspective view of the vehicle lamp principal part which concerns on this invention. It is a front view of the vehicular lamp principal part concerning the present invention. It is a top view of the vehicular lamp principal part concerning the present invention. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is the B section enlarged detail drawing of FIG. It is CC sectional view taken on the line of FIG. (A) is a luminous intensity distribution figure of the conventional vehicle lamp, (b) is a luminous intensity distribution figure of the vehicle lamp which concerns on this invention. It is a longitudinal cross-sectional view of the vehicle lamp proposed in Patent Document 1. It is a principal part expansion perspective view of the vehicle lamp proposed in patent document 1. It is a principal part expansion perspective view of the vehicle lamp proposed in the patent document 2. FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a perspective view of a main part of a vehicular lamp according to the present invention, FIG. 2 is an exploded perspective view of the main part of the vehicular lamp, FIG. 3 is a front view of the main part of the vehicular lamp, and FIG. FIG. 5 is a cross-sectional view taken along the line AA in FIG. 3, FIG. 6 is an enlarged detailed view of a portion B in FIG. 5, and FIG. 7 is a cross-sectional view taken along the line CC in FIG.

  The vehicular lamp 1 according to the present embodiment is used as a headlamp disposed on the left and right of the front portion of the vehicle, and the basic configuration of the left and right headlamps is the same. Only the lamp 1 is shown and described.

  As shown in FIGS. 1 to 4, the vehicular lamp 1 according to the present embodiment includes three reflective lamp units 2 arranged side by side in the horizontal direction. Here, each lamp unit 2 includes an LED 3 (see FIGS. 5 and 6) that is a light source, a rectangular flat board 4 that mounts the LED 3 on the lower surface, and light emitted downward from the LED 3 toward the front of the vehicle. And a reflector 5 for reflecting the light. Although not shown, the three lamp units 2 are accommodated in a lamp chamber defined by a transparent outer lens covering the housing and the front opening thereof.

  In each lamp unit 2, the substrate 4 is positioned and fixed on the upper surface of the reflector 5. That is, as shown in FIGS. 1 and 2, positioning pins 6 are erected integrally at three locations on the upper surface of the reflector 5, and three locations on the substrate 4 (three locations corresponding to the positioning pins 6 of the reflector 5). ) Is formed with a circular positioning hole 7 (see FIG. 2). Therefore, when the three positioning pins 6 provided on the upper surface of the reflector 5 are fitted into the three positioning holes 7 formed in the substrate 4 and the substrate 4 is placed on the upper surface of the reflector 5, the substrate 4 is It is accurately positioned on the upper surface of the reflector 5. And if the board | substrate 4 is adhere | attached on the upper surface of the reflector 5 with an adhesive agent etc. with high heat conductivity from this state, this board | substrate 4 will be fixed in the state positioned on the upper surface of the reflector 5. FIG. The lower surface of the substrate 4 is a low reflectivity surface, and in this embodiment, a black resist film 13 is formed on the lower surface of the substrate 4. The LED 3 is mounted on the bottom surface of the substrate 4 so that the light emission direction is downward. Note that the substrate 4 and the reflector 5 may be fixed by screws or heat caulking, in addition to bonding with an adhesive. In the present embodiment, the black resist film 13 having a reflectance of 10% or less is formed on the bottom surface of the substrate 4. Here, in addition to the resist film 13, a black coating film having a reflectance of 10% or less may be formed on the bottom surface of the substrate 4, and the thickness of the coating film and the concentration of the reflective material (for example, carbon powder) are appropriately set. What is necessary is just to form in the bottom face of the board | substrate 4 so that reflectance may be adjusted to 10% or less. Further, since the carbon powder has light absorptivity, a black resist film having a high absorption surface with a light absorption rate of 90% or more may be formed on the bottom surface of the substrate 4. That is, the coating film that suppresses glare light may have not only a low reflectance but also a high absorption rate.

  Here, as shown in FIG. 6, the side surface 3 a of the LED 3 is closer to the front side (left side in FIG. 6) than the center of the opening 5 b of the reflector 5 with respect to the longitudinal direction of the vehicle (the left-right direction in FIG. And it is arrange | positioned near the inner peripheral wall 5b1 of the reflector 5. FIG. Further, the side surface 3a on the front side of the LED 3 is designed so as not to exceed the endmost portion 5b2 of the inner peripheral wall 5b1 of the reflector 5. This is because if the LED 3 gets too close to the inner peripheral wall 5 b 1 of the reflector 5, the LED 3 itself prevents the light reflected by the curved surface of the inner peripheral wall 5 b 1 of the reflector 5 from going toward the substrate 4. By disposing the LED 3 in the longitudinal direction of the vehicle as described above, the light emitted toward the front of the vehicle from the LED 3 that causes glare is reflected by the inner peripheral wall 5b1 of the reflector 5, and the reflected light is reflected. It is possible to efficiently guide to the bottom surface of the substrate 4.

  Further, as shown in FIG. 6, the LED 3 is arranged so that the surface 3b thereof is substantially flush with the upper surface 5b3 of the inner peripheral wall 5b1 of the reflector 5 with respect to the vertical direction of the vehicle. Needless to say, if the surface 3b is positioned above the upper surface 5b3 of the inner peripheral wall 5b1 of the reflector 5, more light leaks from the reflector 5 to the outside. Furthermore, it arrange | positions so that the surface 3b of LED3 may not be located below exceeding the thickness of the inner peripheral wall 5b1 of the reflector 5. FIG. By this positional relationship, the light emitted from the LED 3 that causes glare to the front of the vehicle is reflected by the curved surface of the inner peripheral wall 5b1 of the reflector 5, and the reflected light is efficiently guided to the bottom surface of the substrate 4. Is possible.

  By the way, each reflector 5 is integrally formed of resin, and includes a reflecting portion surface 5a that curves in a paraboloid. As shown in FIGS. 5 and 6, an opening 5 b through which light emitted downward from the LED 3 passes is formed in a part of the upper wall of each reflector 5. Note that the reflection surface 5a of the reflector 5 is subjected to a reflection process such as aluminum vapor deposition.

Here, in the present embodiment, as shown in detail in FIG. 6, a part of the inner peripheral wall 5b1 of the opening 5b formed on the upper wall of the reflector (specifically, on the reflecting surface 5a of the reflector 5). The facing part) is a convex curved surface,
Each reflector 5 is rotatably supported on the upper surface of a bracket 8 integrally formed in a rectangular frame shape with resin. That is, as shown in FIGS. 2 and 7, a cylindrical bearing portion 5 </ b> A is integrally projected from the center of the upper wall of the reflector 5, and this bearing portion 5 </ b> A is integrally formed on the upper surface of the bracket 8. Each reflector 5 is supported on the upper surface of the bracket 8 so as to be horizontally rotatable around the boss 8A by fitting the outer periphery of the upright cylindrical boss 8A from above.

  As shown in FIGS. 2, 4, and 7, hooks 9 bent in an inverted L shape are integrally formed on the left and right sides of the rotation center of each reflector 5. An engaging claw 9a is formed. Further, as shown in FIGS. 2 and 4, an operation pin 10 is erected integrally with a rear end side of each reflector 5, and an arcuate screw insertion hole 11 is formed.

  On the other hand, as shown in FIGS. 2 and 7, there are two left and right portions (two portions corresponding to the hooks 9 formed on the left and right sides of each reflector 5) of the upper surface of the bracket 8 where the reflectors 5 are supported. A long hole-shaped guide hole 12 is formed. In addition, as shown in FIG. 2, screw bosses 8B are integrally formed at one place on the back side of the portion of the upper surface of the bracket 8 where each reflector 5 is supported (where the screw insertion hole 11 of the bracket 8 is formed). A screw hole 8a (see FIG. 4) is formed at the center of each screw boss 8B. Then, the left and right hooks 9 of each reflector 5 are passed through the guide holes 12 of the bracket 8 from above, and the engaging claws 9a at the tips of the hooks 9 are engaged with the guide holes 12 as shown in FIG. As a result, each reflector 5 can rotate horizontally in either direction around the boss 8A of the bracket 8 as long as each hook 9 can move in the guide hole 12.

  Thus, in the vehicular lamp 1 configured as described above, when a current is supplied to the LED 3 of each lamp unit 2 from a power source (not shown) such as a battery, the LED 3 is activated and emits light. Exits downward as shown in FIG. A part of the light emitted downward from the LED 3 passes through the opening 5b of the reflector 5 and is reflected by the reflecting surface 5a toward the front of the vehicle (left side in FIG. 5), and the reflected light L1 is not transparent. The vehicle lamp 1 functions as a headlamp because it passes through the illustrated outer lens and is irradiated forward of the vehicle.

  Further, of the light emitted downward from the LED 3, the direct light L 2 that does not reach the reflecting surface 5 a of the reflector 5 is, as shown in FIG. 6, the inner peripheral wall of the opening 5 b formed on the upper wall of the reflector 5. The light is reflected by a part of the curved surface 5b1 and travels toward the bottom surface of the substrate 4. In this case, since the black resist film 13 is formed on the bottom surface of the substrate 4 as described above, the light L2 reflected by a part of the curved surface of the inner peripheral wall 5b1 of the opening 5b of the reflector 5 is reflected on the substrate 4. Is not absorbed and reflected by the resist film 13 on the bottom surface. Therefore, the occurrence of glare due to the direct light L2 is suppressed, and the driver and pedestrians of the oncoming vehicle are not dazzled.

  Here, FIG. 8 (a) shows the luminous intensity distribution of a conventional vehicular lamp in which the inner peripheral wall of the opening formed in the bracket is a vertical plane. In the conventional vehicular lamp, the luminous intensity distribution by direct light is shown. Although the occurrence of high glare (x mark) is seen, in the vehicular lamp 1 according to the present invention, the altitude is low as shown in FIG. 8B, and the occurrence of glare (x mark) is not confirmed.

  By the way, in the vehicle lamp 1 according to the present embodiment, each reflector 5 is supported so as to be rotatable around the boss 8A of the bracket 8 as described above. By rotating about 8A, the optical axis of each lamp unit 2 can be adjusted. The optical axis of each lamp unit 2 is adjusted by operating an operation pin 10 erected at one location on the back side of each reflector 5 to rotate each reflector 5 by a predetermined angle around the boss 8A of the bracket 8. Made by.

  After the adjustment of the optical axis of each lamp unit 2, a screw boss 8 </ b> B (see FIG. 2) is installed with a screw (not shown) inserted into the screw insertion hole 11 of each reflector 5 at one place on the back side of the bracket 8. Each reflector 5 is fixed to the bracket 8 by being screwed into a screw hole 8a (see FIG. 4). At this time, as shown in FIG. 7, the engaging claws 9 a at the tips of the left and right hooks 9 of each reflector 5 are engaged with the guide holes 12 of the bracket 8. The dropout is surely prevented.

  Thus, in the vehicular lamp 1 according to the present embodiment, each of the reflectors 5 of the three lamp units 2 arranged in parallel in the lateral direction has a part of the adjacent ones as shown in FIG. They are arranged stepwise so as to overlap each other by x in the left-right direction and by y in the height direction. Further, as shown in FIG. 4, the reflectors 5 of the three lamp units 2 are arranged in a staircase pattern so that a part of the adjacent ones overlap each other by z shown in the front-rear direction. As a result, the width of the vehicular lamp 1 is reduced, and the vehicular lamp 1 can be downsized. As in the present embodiment, the multi-lamp reflector type lamp unit 2 whose width dimension is reduced is required to reduce the shape of the reflector 5 in the front / rear / up / down / left / right directions as much as possible. As the shape is reduced, light that causes glare is more likely to leak, and it becomes impossible to add a shielding object in the reflector 5 as in the conventional example. Therefore, as in the present invention, the use of the black resist film 13 on the inner peripheral wall 5b1 of the reflector 5 and the bottom surface of the substrate 4 for the multi-lamp reflector can suppress the occurrence of glare without using an additional member. In addition, since there is no shield in the reflector 5, the light utilization efficiency of the reflector 5 can be improved.

  In the above, according to the vehicular lamp 1 according to the present embodiment, as shown in FIG. 6, the direct light L2 emitted from the LED 3 is at least a part of the inner peripheral wall 3b of the opening 3b formed in the reflector 3 ( Reflected by the curved surface formed on the reflecting surface 5a of the reflector 5), is directed toward the bottom surface of the substrate 4, and is absorbed by the black resist film 13 formed on the bottom surface of the substrate 4, and thus is caused by the direct light L2. The effect that generation | occurrence | production of glare is suppressed is acquired.

  In the above, the embodiment in which the present invention is applied to a vehicular lamp used as a headlamp has been described. However, the present invention is similarly applied to a vehicular lamp used for any other purpose. Of course, it is possible.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Lamp unit 3 LED (light source)
DESCRIPTION OF SYMBOLS 4 Board | substrate 5 Reflector 5a Reflector surface 5b Reflector opening 5b1 Opening inner wall 6 Positioning pin 7 Positioning hole 8 Bracket 9 Hook 9a Hook engaging claw 10 Operation pin 11 Screw insertion hole 12 Guide hole 13 Resist film L1 Reflected light L2 Direct light

Claims (3)

In a vehicle lamp comprising an LED mounted on a substrate and a reflector formed with an opening through which light emitted from the LED passes,
A vehicular lamp characterized in that at least a part of the inner peripheral wall of the opening of the reflector is a curved surface, and the surface on which the LED is mounted is a low reflectance surface and / or a high absorptance surface. .   2. The vehicular lamp according to claim 1, wherein a portion of the inner peripheral wall of the opening of the reflector facing the reflecting surface of the reflector is a curved surface. The vehicular lamp according to claim 1, wherein a black resist film is formed on a surface of the substrate on which the LED is mounted.

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