VEHICULAR HEADLAMP

• US 20190331309A1
• Filed: 12/22/2016
• Published: 10/31/2019
• Est. Priority Date: 12/22/2016
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Kuwata, Muneharu, Suwa, Masashige, Sawai, Naoki, Adachi, Ryoto, Inoue, Naoto
• Granted Patent: US 10,883,689 B2
• Time in Patent Office: Days
• CPC Class Codes: F21S 41/16 Laser light sources
• CPC Class Codes: F21S 41/176 Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
• CPC Class Codes: F21S 41/24 Light guides
• CPC Class Codes: F21S 41/26 Elongated lenses
• CPC Class Codes: F21S 41/265 Composite lenses; Lenses with a patch-like shape
• CPC Class Codes: F21S 41/663 by switching light sources by switching incandescent light sources F21S41/162
• CPC Class Codes: F21V 5/04 of lens shape

Abstract

The left headlamp (100L) includes first light source modules (13L, 14L, and 15L) and a light guide member (16L). The first light source modules (13L, 14L, and 15L) corresponds to partial light distributing patterns (P1L, P2L, and P3L) and have light projection directions parallel to each other. The light guide member (16L) has: first incident surfaces (17L, 18L, and 19L), arranged so as to face the first light source modules (13L, 14L, and 15L) and corresponding to the first light source modules (13L, 14L, and 15L); and an emitting surface (20L), arranged so as to face the first incident surfaces (17L, 18L, and 19L) and shared by the first light source modules (13L, 14L, and 15L). The light guide member (16L) forms a light distributing pattern (PL) by deflecting light projected by the first light source modules (13L, 14L, and 15L).

Claims

1. A vehicular headlamp capable of freely forming a light distributing pattern for a light distribution variable type headlamp by using a combination of partial light distributing patterns, the vehicular headlamp comprising:

first light source modules corresponding to the partial light distributing patterns and having light projection directions parallel to each other; and

a light guide member having;

first incident surfaces, arranged so as to face the first light source modules and corresponding to the first light source modules; and

an emitting surface, arranged so as to face the first incident surfaces and shared by the first light source modules, the light guide member forming the light distributing pattern by deflecting light projected by the first light source modules.

2. The vehicular headlamp according to claim 1, wherein the first incident surfaces are set to have tilt angles with respect to the emitting surface and different from each other.

3. The vehicular headlamp according to claim 2,

wherein the first incident surfaces are arrayed along a longitudinal direction of the emitting surface, and

the tilt angles of the first incident surfaces with respect to the emitting surface are set to values gradually increasing from one end toward another end of the emitting surface or values gradually decreasing from the one end toward the other end of the emitting surface.

4. The vehicular headlamp according to claim 2, further comprising:

a second light source module having a light projection direction parallel to light projection directions of the first light source modules,

wherein the light guide member has;

a second incident surface, arranged so as to face the second light source module and corresponding to the second light source module; and

an emitting surface, arranged so as to face the first incident surfaces and the second incident surface and shared by the first light source modules and the second light source module, and

the second incident surface is parallel to the emitting surface.

5. The vehicular headlamp according to claim 2,

wherein, in the light guide member, thicknesses of portions through which main optical paths corresponding to the first light source modules pass are set to values equivalent to each other.

6. The vehicular headlamp according to claim 2, wherein the first incident surfaces and the emitting surface are curved.

7. The vehicular headlamp according to claim 2,

wherein the first incident surfaces are arrayed along a longitudinal direction of the emitting surface, and

portions of the light guide member respectively corresponding to the first incident surfaces are set to have thicknesses such that, relative to a thickness on one end side of the emitting surface, a thickness on another one end side of the emitting surface has a smaller value.

8. The vehicular headlamp according to claim 2,

wherein the first incident surfaces are arrayed along a longitudinal direction of the emitting surface, and

the tilt angles of the first incident surfaces with respect to the emitting surface are set to values irregularly varying from one end toward another end of the emitting surface.