JP2015146270A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture which reduces a non-irradiated region occurring between a plurality of light distribution patterns.SOLUTION: A vehicular lighting fixture 10 includes: a projection lens 12 arranged on an optical axis extending in a vehicle longitudinal direction; a first light source arranged behind the projection lens; a second light source arranged behind the projection lens; a first reflector 18 for reflecting the light emitted from the first light source toward the projection lens; a second reflector 20 for reflecting the light emitted from the second light source toward the projection lens on a first reflection surface 20a; a shade 22 configured so as to be able to form a first light distribution pattern having a cutoff line by shielding at least one part of the light reflected by the first reflector; and a third reflector 24 configured so as to reflect the light reflected on a second reflection surface 20b of the second reflector out of the light emitted from the second light source toward the projection lens once again.

Description

  The present invention relates to a vehicular lamp.

  Conventionally, a vehicular lamp has been devised that can switch between a low beam light distribution pattern and a high beam light distribution pattern by arranging a plurality of light sources in one lamp and individually controlling the light-off state of each light source. . For example, a vehicular headlamp including a projection lens disposed on an optical axis extending in the vehicle front-rear direction and a first light source unit and a second light source unit disposed behind the projection lens is known. (See Patent Document 1).

  The first light source unit of the vehicle headlamp includes a first semiconductor light emitting element disposed upward on a first reference axis extending in the vehicle front-rear direction, and a first semiconductor light emitting element directed forward with light from the first semiconductor light emitting element. A first reflector configured to reflect near one reference axis and converge near the rear focal position of the projection lens, and a predetermined surface shape so as to prevent part of the reflected light from the first reflector from going straight ahead And a straight travel prevention member formed to extend rearward from the vicinity of the rear focal position of the projection lens. In addition, the second light source unit includes a second semiconductor light emitting element disposed downward on a second reference axis extending in the vehicle front-rear direction, and light from the second semiconductor light emitting element forward and closer to the second reference axis. A second reflector configured to reflect and converge near the rear focal position of the projection lens. The vehicular headlamp forms a low-beam light distribution pattern having a cut-off line as an inverted projection image of the front end edge of the straight travel prevention member at the upper end by turning on the first light source unit, and the second light source When the unit is turned on, a high beam additional light distribution pattern extending upward from the cut-off line is formed.

JP 2005-108554 A

  However, the above-described straight travel preventing member is a member shared as the shade of the first light source unit and the second light source unit, and has a finite thickness in consideration of strength and the like. Therefore, a non-irradiation region may occur between the low beam light distribution pattern and the high beam additional light distribution pattern.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicular lamp that reduces a non-irradiation region generated between a plurality of light distribution patterns.

  In order to solve the above problems, a vehicular lamp according to an aspect of the present invention includes a projection lens disposed on an optical axis extending in the vehicle front-rear direction, a first light source disposed behind the projection lens, and a projection lens. A second light source disposed behind the first light source, a first reflector that reflects the light emitted from the first light source toward the projection lens, and the light emitted from the second light source is reflected toward the projection lens by the first surface. A second reflector, a shade configured to form a first light distribution pattern having a cut-off line by blocking at least a part of the light reflected by the first reflector, and a light emitted from the second light source A third reflector configured to reflect the light reflected by the second surface of the second reflector again toward the projection lens.

  According to this aspect, the light reflected by the second surface of the second reflector is reflected again by the third reflector and projected forward, so that the light reflected by the first surface of the second reflector or the first reflector is not reflected. A non-irradiated region that cannot be irradiated can be irradiated.

  The first reflector and the shade may be configured to form a low beam light distribution pattern as the first light distribution pattern. The second reflector may be configured to form an additional high beam light distribution pattern that irradiates a region above the cutoff line of the first light distribution pattern as the second light distribution pattern. The third reflector may be configured to form a third light distribution pattern that overlaps both the first light distribution pattern and the second light distribution pattern. Thereby, the non-irradiation area | region which arises between a 1st light distribution pattern and a 2nd light distribution pattern can be reduced.

  The third reflector may be disposed in the vicinity of a path from the rear focal point of the projection lens toward the projection lens. As a result, the light reflected by the third reflector appears to enter the projection lens through the shade near the rear focal point.

  The first light source may be arranged to emit light mainly upward. The second light source may be arranged so as to emit light mainly downward. The first reflector may be configured to reflect the light emitted from the first light source toward the projection lens toward the optical axis. The second reflector may be provided on the opposite side of the first reflector across the optical axis, and may be configured to reflect light emitted from the second light source toward the projection lens toward the optical axis.

  The second light source may be disposed closer to the projection lens than the first light source. The second surface may be provided closer to the projection lens than the first surface. Thereby, since the second light source and the second surface are arranged closer to the projection lens, the incident angle of the light incident on the third reflector can be reduced.

  It should be noted that any combination of the above-described constituent elements and a representation of the present invention converted between a method, an apparatus, a system, etc. are also effective as an aspect of the present invention.

  According to the present invention, it is possible to reduce a non-irradiation region generated between a plurality of light distribution patterns.

It is a longitudinal section of the vehicular lamp concerning this embodiment. It is a schematic diagram for demonstrating an example of the light distribution pattern which the vehicle lamp which concerns on this Embodiment forms.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. Further, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 is a longitudinal sectional view of a vehicular lamp according to the present embodiment. FIG. 2 is a schematic diagram for explaining an example of a light distribution pattern formed by the vehicular lamp according to the present embodiment.

  The vehicular lamp 10 according to the present embodiment is used as a vehicular headlamp capable of switching light distribution patterns. The vehicular lamp 10 includes a projection lens 12 disposed on an optical axis Ax extending in the vehicle front-rear direction, and LEDs (light emitting diodes) 14 and 16 serving as a first light source and a second light source disposed behind the projection lens 12. A first reflector 18 that reflects light mainly emitted upward from the LED 14 disposed behind the rear focal point F of the projection lens 12 toward the optical axis Ax, and a rear focal point of the projection lens 12 A second reflector 20 that reflects light emitted mainly downward from the LED 16 disposed behind F to the front projection lens 12 toward the front projection lens 12 by the first reflecting surface 20a, and at least the first reflector 18 A shade 22 configured to form a first light distribution pattern having a cutoff line by blocking a part of the light reflected by the LED 16 and the LED 16 It comprises a second third reflector 24 is configured to reflect again the light reflected by the reflective surface 20b toward the projection lens 12 of the second reflector 20 of the emergent light.

  As the projection lens 12, a plano-convex lens having a convex curved surface on the front side and a flat surface on the rear side is generally used. In the projection lens 12, a line connecting the upper end and the lower end of the rear end surface, which is a plane facing the first reflector 18, is arranged in parallel to the vertical.

  The LEDs 14 and 16 are, for example, a single light emitting chip having a size of about 1 mm square, or a white light emitting diode having a rectangular light emitting unit in which a plurality of chips are arranged. The LEDs 14 and 16 are fixed to the upper or lower surfaces of the base portions 26 and 28 in a state of being mounted on the substrate. The LED 14 emits light toward the rear focal point F of the projection lens 12, and the LED 16 also emits light toward the rear focal point F of the projection lens 12.

  Further, the LED 14 is lit not only when the low beam distribution pattern is formed as the first light distribution pattern, but also when the high beam distribution pattern is formed as the second light distribution pattern. On the other hand, the LED 16 is turned on when a high beam light distribution pattern is formed.

  The first reflector 18 has a substantially spheroidal reflecting surface 18a having the optical axis Ax as a central axis. The reflecting surface 18a has a substantially elliptical cross section including the optical axis Ax. The LED 14 is disposed in the vicinity of an elliptical first focal point F1 formed in a vertical section including the optical axis Ax of the reflecting surface 18a. Thereby, the reflecting surface 18a reflects the light from the LED 14 forward toward the optical axis Ax. At that time, in the vertical cross section including the optical axis Ax, the light beam is substantially converged on the second focal point F2 of the ellipse. In the present embodiment, the second focal point F2 substantially coincides with the rear focal point F of the projection lens 12.

  The second reflector 20 includes a first reflection surface 20a having a substantially spheroidal surface with the extension line L1 of the base portion 28 inclined with respect to the optical axis Ax as a central axis. The first reflecting surface 20a has a substantially elliptical cross section including the extension line L1. The LED 16 is disposed in the vicinity of an elliptical first focal point F1 'formed in a vertical section including the extension line L1 of the first reflecting surface 20a. Thus, the first reflecting surface 20a reflects light from the LED 16 forward toward the optical axis Ax. At that time, in the vertical cross section including the optical axis Ax, the light beam is substantially converged on the second focal point F2 of the ellipse. In addition, the shape of the reflective surface of the 1st reflector 18 and the 2nd reflector 20 is suitably selected and fine-corrected according to the shape of the required light distribution pattern, and each shape may differ.

  The shade 22 forming the cut-off line is a shielding member that partially shields light emitted from the LED 14 and reflected by the reflection surface 18a of the first reflector 18. The upper surface of the shade 22 functions as a reflecting surface by mirror finishing. Further, the front edge 22a of the shade 22 is located behind the rear focal point F (on the right side shown in FIG. 1). The leading edge 22a has a shape corresponding to the cut-off line of the light distribution pattern projected forward.

  As shown in FIG. 2, the shade 22, the first reflector 18, the second reflector 20, and the like according to the present embodiment block a part of the light emitted from the LED 14, and have a first cut-off line CL1. The pattern PL can be formed, and the additional high beam light distribution pattern PH having the second cutoff line CL2 can be formed by blocking a part of the light emitted from the LED 16.

  The additional high beam light distribution pattern PH irradiates a region above the first cut-off line CL1 of the low beam light distribution pattern PL. Further, a non-irradiation region R1 is formed between the first cutoff line CL1 of the low beam distribution pattern PL and the second cutoff line CL2 of the additional high beam distribution pattern PH.

  Therefore, the third reflector 24 reflects the light reflected by the second reflecting surface 20b of the second reflector 20 out of the light emitted from the LED 16 again toward the projection lens 12, and irradiates the non-irradiation region R1. It is used for. The shape and position of the reflection surface of the third reflector 24 are appropriately configured as a flat surface or a curved surface so that the non-irradiation region R1 can be irradiated. Then, the light reflected by the third reflector 24 passes through the projection lens 12 and is projected forward. As shown in FIG. 2, the low beam light distribution pattern PL and the additional high beam light distribution pattern PH are partially shared. An overlapping light distribution pattern PA is formed.

  In this way, the light reflected by the second reflecting surface 20b of the second reflector 20 is reflected again by the third reflector 24 and projected forward to form the light distribution pattern PA, thereby forming the first light distribution pattern PA. It is possible to irradiate the non-irradiated region R1 that cannot be irradiated by the additional high beam light distribution pattern PH by the light reflected by the reflective surface 20a or the low beam light distribution pattern PL by the light reflected by the first reflector 18. As a result, the occurrence of a non-irradiation region between the low-beam light distribution pattern PL and the additional high-beam light distribution pattern PH is reduced, and the forward visibility can be improved and the driver's uncomfortable feeling with respect to the non-irradiation region can be reduced.

  The third reflector 24 is disposed in the vicinity of a path from the rear focal point F of the projection lens 12 toward the projection lens 12. As a result, the light reflected by the third reflector 24 appears to enter the projection lens 12 through the shade 22 in the vicinity of the rear focal point F. That is, the non-irradiation region R <b> 1 generated due to the thickness of the shade 22 can be irradiated with the light reflected by the third reflector 24.

  The LED 16 is disposed closer to the projection lens 12 than the LED 14. The second reflecting surface 20b of the second reflector 20 is provided closer to the projection lens 12 than the first reflecting surface 20a. Thereby, since the LED 16 and the second reflecting surface 20b of the second reflector 20 are arranged closer to the projection lens 12, the incident angle of the light incident on the third reflector 24 can be reduced. That is, as the light reflected by the third reflector 24, the light emitted from the LED 16 in the direction close to the main direction (the direction with the highest luminous intensity) L2 can be used. As a result, the illuminance of the light distribution pattern PA is improved, and the non-irradiation region R1 can be further reduced.

  The first reflecting surface 20a and the second reflecting surface 20b of the second reflector 20 are discontinuous surfaces (for example, the first reflecting surface 20a is a spheroid and the second reflecting surface 20b is a paraboloid of revolution. Or a continuous surface (when the entire reflecting surface of the second reflector 20 is a spheroidal surface and the front thereof is simply used as the second reflecting surface 20b). There may be. In the case of a discontinuous surface, the entire second reflector 20 may be integrated or may be divided into a plurality of members.

  As described above, the present invention has been described with reference to the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and the configurations of the embodiments are appropriately combined or replaced. Those are also included in the present invention. Further, it is possible to appropriately change the combination and processing order in each embodiment based on the knowledge of those skilled in the art and to add various modifications such as various design changes to each embodiment. Embodiments to which is added can also be included in the scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 Vehicle lamp, 12 Projection lens, 14,16 LED, 18 1st reflector, 18a Reflective surface, 20 2nd reflector, 20a 1st reflective surface, 20b 2nd reflective surface, 22 Shade, 22a Tip edge, 24 Third reflector.

Claims (5)

A projection lens disposed on an optical axis extending in the vehicle longitudinal direction;
A first light source disposed behind the projection lens;
A second light source disposed behind the projection lens;
A first reflector that reflects light emitted from the first light source toward the projection lens;
A second reflector that reflects light emitted from the second light source on the first surface toward the projection lens;
A shade configured to form a first light distribution pattern having a cutoff line by blocking at least a part of the light reflected by the first reflector;
A third reflector configured to reflect light reflected from the second surface of the second reflector out of the light emitted from the second light source toward the projection lens;
A vehicular lamp characterized by comprising: The first reflector and the shade are configured to form a low beam light distribution pattern as the first light distribution pattern,
The second reflector is configured to form an additional high beam light distribution pattern that irradiates a region above the cut-off line of the first light distribution pattern as a second light distribution pattern,
The third reflector is configured to form a third light distribution pattern that overlaps both the first light distribution pattern and the second light distribution pattern.
The vehicular lamp according to claim 1.   3. The vehicular lamp according to claim 1, wherein the third reflector is disposed in the vicinity of a path from a rear focal point of the projection lens toward the projection lens. 4. The first light source is disposed so as to emit light mainly upward,
The second light source is arranged to emit light mainly downward,
The first reflector is configured to reflect light emitted from the first light source toward the projection lens toward the optical axis,
The second reflector is provided on the opposite side of the first reflector across the optical axis, and is configured to reflect light emitted from the second light source toward the projection lens toward the optical axis. ,
The vehicular lamp according to any one of claims 1 to 3, wherein the vehicular lamp is provided. The second light source is disposed closer to the projection lens than the first light source,
The second surface is provided closer to the projection lens than the first surface.
The vehicular lamp according to any one of claims 1 to 4, wherein the vehicular lamp is provided.

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