JP2015130293A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture that can improve light use efficiency while preventing glare.SOLUTION: A vehicular lighting fixture 10 comprises an LED 15, a board 16 on which the LED 15 is mounted, a reflector 17 that reflects light from the LED 15 and projects a low beam light distribution pattern, and a shade 18 that prevents the light from the LED 15 from being directly emitted to the outside of the lighting fixture. The shade 18 comprises a diffuse reflection surface 18b that diffusely reflects a portion of the light reflected by the reflector 17 and projects an overhead sign light distribution pattern different from the low beam light distribution pattern.

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp using a light emitting element such as an LED and a parabolic reflector.

  In recent years, the brightness of LEDs has been increasing, and vehicle lamps using LEDs have been realized. For example, Patent Document 1 discloses a vehicular lamp that includes a plurality of LEDs and a plurality of reflectors that reflect light from each LED.

JP 2011-81975 A

  By the way, the LED which emits light in a spot shape may give glare to a pedestrian, a driver of an oncoming vehicle, etc. by the direct light. In order to prevent glare, a configuration in which the upper part of the light emitting surface of the LED is covered with a shade to block direct light can be employed.

  However, when such a configuration is adopted, the light reflected by the reflector may be reflected again by the back surface of the shade and may cause glare. In order to prevent such glare, it is conceivable to apply an antireflection treatment to the back surface of the shade, but in this case, the corresponding light may be lost and the light utilization efficiency may be reduced.

  The present invention has been made in view of such a situation, and an object thereof is to provide a vehicular lamp that can improve light utilization efficiency while preventing glare.

  In order to solve the above problems, a vehicle lamp according to an aspect of the present invention includes a light source mounting portion for mounting a light source, a reflector that reflects light from the light source and irradiates a first light distribution pattern, and a light source. And a shade for preventing light from being directly emitted outside the lamp. The shade has a diffuse reflection surface that diffuses and reflects part of the light reflected by the reflector and irradiates a second light distribution pattern different from the first light distribution pattern.

  The diffuse reflection surface may have a convex curved surface shape or a concave curved surface shape.

  The light source may be a semiconductor light emitting element, the reflector may be a parabolic reflector, and the shade may be disposed so as to cover at least a part of the light emitting surface of the semiconductor light emitting element.

  The first light distribution pattern may be a low beam light distribution pattern, and the second light distribution pattern may be an overhead sign light distribution pattern.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle lamp which can improve light utilization efficiency can be provided, preventing a glare.

1 is a schematic vertical sectional view of a vehicular lamp according to an embodiment of the present invention. It is a figure for demonstrating the light distribution pattern formed with the lamp unit of this embodiment. It is a general | schematic vertical sectional view for demonstrating the vehicle lamp which concerns on a modification.

  Hereinafter, a vehicular lamp according to an embodiment of the present invention will be described in detail with reference to the drawings. In the present specification, when terms indicating directions such as “up”, “down”, “front”, “back”, “left”, “right”, “inside”, “outside”, etc. are used, It means the direction in the posture when the vehicular lamp is mounted on the vehicle.

  FIG. 1 is a schematic vertical sectional view of a vehicular lamp 10 according to an embodiment of the present invention. A vehicular lamp 10 shown in FIG. 1 is a headlamp that is arranged one by one on the left and right of the front portion of the vehicle.

  As shown in FIG. 1, the vehicular lamp 10 includes a lamp body 12 and a transparent outer cover 13 that covers the front opening of the lamp body 12. The lamp body 12 and the outer cover 13 form a lamp chamber 14.

  A lamp unit 11 for irradiating a low beam light distribution pattern is accommodated in the lamp chamber 14. The lamp unit 11 is a so-called parabolic lamp unit, and is fixed to the lamp body 12 by a support member (not shown). The lamp unit 11 includes an LED 15 as a light source, a substrate 16 on which the LED 15 is mounted, a reflector 17, and a shade 18.

  The LED 15 is mounted on the upper surface 16a of the substrate 16 with the light emitting surface facing upward. The LED 15 emits light when supplied with current from the substrate 16.

  The reflector 17 is a so-called parabolic reflector having a reflecting surface 17a formed with reference to a paraboloid of revolution. The reflector 17 is provided on the upper surface 16 a of the substrate 16 so that the reflecting surface 17 a covers the LED 15. The installation position of the reflector 17 is behind the LED 15. The LED 15 is located at the focal point of the reflecting surface 17a. The reflector 17 reflects light from the LED 15 located at the focal point and irradiates a low beam light distribution pattern in front of the lamp. FIG. 1 shows a light beam L1 (solid line) that is emitted from the LED 15 and then is reflected by the reflecting surface 17a of the reflector 17 and applied to the front of the lamp.

  The shade 18 prevents the light emitted from the LED 15 from being directly emitted outside the lamp. The shade 18 is provided on the upper surface 16 a of the substrate 16 so as to cover at least a part (for example, about half) of the light emitting surface of the LED 15. The installation position of the shade 18 is in front of the LED 15. The LED side surface 18 a of the shade 18 is a light absorption surface that absorbs light incident from the LED 15. The light absorbing surface 18a may be formed by laminating a light absorbing material such as a black ABS resin. FIG. 1 illustrates a light ray L2 (dotted line) that is emitted from the LED 15 and then absorbed by the light absorption surface 18a of the shade 18. If the shade 18 is not provided, the light beam L2 is directly emitted from the outer cover 13 to the outside of the lamp. By providing the shade 18 as in this embodiment, direct light is prevented from being emitted to the outside of the lamp, and a situation in which glare is given to pedestrians, drivers of oncoming vehicles, and the like can be prevented.

  A surface 18 b of the shade 18 opposite to the light absorbing surface 18 a faces the reflecting surface 17 a of the reflector 17. In the present embodiment, the reflector side surface 18b of the shade 18 is formed as a reflection surface that diffuses and reflects part of the light emitted from the LED 15 and reflected by the reflection surface 17a of the reflector 17. In the present embodiment, the diffuse reflection surface 18b has a convex curved surface shape. On the diffuse reflection surface 18b, for example, steps or irregularities for diffusely reflecting light from the reflector 17 may be formed. FIG. 1 shows a light beam L3 (broken line) that is emitted from the LED 15 and reflected by the reflecting surface 17a of the reflector 17 and then diffusely reflected by the diffuse reflecting surface 18b of the shade 18 in front of the lamp. The light beam L3 is a light beam directed upward from the light beam L1, and forms a light distribution pattern for an overhead sign (an overhead sign) that is a light distribution pattern different from the low beam light distribution pattern.

  FIG. 2 is a diagram for explaining a light distribution pattern formed by the lamp unit 11 of the present embodiment. FIG. 2 shows a light distribution pattern 20 formed on a virtual vertical screen disposed at a position 25 m ahead of the vehicular lamp 10. FIG. 2 shows a vertical line VV passing through the point HV that is a vanishing point in the front direction of the lamp, and a horizontal line HH passing through the point HV.

  The light distribution pattern 20 irradiated to the front of the lamp by the lamp unit 11 includes a low beam light distribution pattern 21 and an overhead sign light distribution pattern 22.

  The low beam light distribution pattern 21 is formed by light (light beam L1 shown in FIG. 1) that is emitted from the LED 15 and then reflected forward by the reflecting surface 17a of the reflector 17 to the lamp. The low beam light distribution pattern 21 is a light distribution pattern formed mainly below the horizontal line HH, and has a cut-off line CL having a predetermined shape around the point HV.

  On the other hand, the light distribution pattern for overhead sign 22 is emitted from the LED 15, reflected by the reflecting surface 17 a of the reflector 17, and subsequently diffused and reflected by the diffuse reflecting surface 18 b of the shade 18 (light ray L 2 shown in FIG. 1). It is formed. The overhead sign light distribution pattern 22 is a light distribution pattern formed above the low beam light distribution pattern 21, and is, for example, about −12 ° to 12 ° in the horizontal line HH direction and the vertical line VV direction. The region may be about 2 ° to 6 °.

  The vehicle lamp 10 according to the present embodiment has been described above. According to the vehicle lamp 10, the overhead sign light distribution pattern 22 can be formed in addition to the low beam light distribution pattern 21. Here, in the present embodiment, the light emitted from the LED 15 and then reflected by the reflecting surface 17a of the reflector 17 is diffusely reflected upward by the diffusing reflecting surface 18b of the shade 18 to thereby distribute the overhead sign light distribution pattern 22. Is forming. Thereby, light use efficiency can be improved while preventing glare.

  In the above-described embodiment, the overhead sign light distribution pattern 22 is formed by the light reflected by the shade 18 of the lamp unit 11. However, a dedicated lamp unit for forming the overhead sign light distribution pattern in the vehicle lamp 10 may be separately provided, and the overhead sign light distribution pattern 22 formed by the lamp unit 11 may be used as an auxiliary. . In this case, the visibility can be improved as compared with the case where the lamp unit dedicated to the overhead sign is used alone.

  FIG. 3 is a schematic vertical sectional view for explaining a vehicular lamp 30 according to a modification. In the vehicular lamp 30 shown in FIG. 3, the same or corresponding components as those in the vehicular lamp 10 shown in FIG.

  The vehicular lamp 30 according to this modification differs from the vehicular lamp 10 shown in FIG. 1 in that the diffuse reflection surface 18b of the shade 18 has a concave curved surface shape. As in this modification, even when the diffuse reflection surface 18b has a concave curved surface shape, the light from the reflector 17 can be diffusely reflected upward to form an overhead sign light distribution pattern.

  The present invention has been described above based on the embodiment. It is to be understood by those skilled in the art that these embodiments are exemplifications, and various modifications can be made to the combination of each component, and such modifications are also within the scope of the present invention.

  For example, in the above-described embodiment, the LED is exemplified as the light source, but the light source is not limited to the LED, and may be, for example, a semiconductor laser or a bulb.

  10, 30 Vehicle lamp, 11 Lamp unit, 12 Lamp body, 13 Outer cover, 14 Lamp chamber, 15 LED, 16 Substrate, 17 Reflector, 18 Shade, 20 Light distribution pattern, 21 Low beam light distribution pattern, 22 For overhead sign Light distribution pattern.

Claims (4)

A light source mounting portion for mounting a light source;
A reflector that reflects light from the light source and irradiates the first light distribution pattern;
A shade for preventing light from the light source from being emitted directly to the outside of the lamp;
With
The vehicular lamp according to claim 1, wherein the shade includes a diffuse reflection surface that diffuses and reflects part of the light reflected by the reflector and irradiates a second light distribution pattern different from the first light distribution pattern.   The vehicular lamp according to claim 1, wherein the diffuse reflection surface has a convex curved surface shape or a concave curved surface shape.   The said light source is a semiconductor light emitting element, the said reflector is a parabolic reflector, and the said shade is arrange | positioned so that at least one part of the light emission surface of the said semiconductor light emitting element may be covered. The vehicle lamp as described.   4. The vehicular lamp according to claim 1, wherein the first light distribution pattern is a low beam light distribution pattern, and the second light distribution pattern is an overhead sign light distribution pattern. 5.

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