Light source for head light and head light

Patent metadata

Field	Value
Publication number	US-2015219300-A1
Application number	US-201214419444-A
Country	US
Kind code	A1
Filing date	Aug 28, 2012
Priority date	Aug 28, 2012
Publication date	Aug 6, 2015
Grant date	—

Abstract

In a projector-type headlight in which a light-emitting face of an LED 1 is placed perpendicular to an optical axis so that light emitted by the LED 1 is projected ahead of a vehicle through a convex lens 2 , the light-emitting face is placed upward from the optical axis of the headlight, and a lower edge side 1 a of the light-emitting face is formed into a linear shape and is placed on the optical axis, and a reflection face 3 a is placed in a plane formed by the optical axis and the linear-shape edge side 1 a of the LED 1 to thereby combine direct light emitted by the LED 1 and reflection light reflected on the reflection face 3 a , so that an intensity of light emitted in a direction normal to the light-emitting face from the edge side 1 a is enhanced.

First claim

1 .- 18 . (canceled)

19 . A light source for headlight which projects light emitted from a light-emitting face placed perpendicular to an optical axis of a headlight, ahead of a vehicle through a convex lens, comprising:
an optical source provided with the light-emitting face whose edge side is formed into a linear shape and placed apart from the optical axis; a reflection face that is provided in a plane formed by a line parallel to the optical axis and a line parallel to the edge side with the linear shape of the light-emitting face and placed between the optical axis and the light-emitting face, and that reflects the light emitted from the optical source; and a light guide member provided between the refection face and the convex lens, that brings the light emitted from the light-emitting face, closer toward the optical axis.

20 . A light source for headlight which projects light emitted from a light-emitting face placed perpendicular to an optical axis of a headlight, ahead of a vehicle through a convex lens, comprising:
an optical source provided with the light-emitting face whose edge side is formed into to linear shape and placed apart from the optical axis; and a light guide member that brings the light emitted from the light-emitting, face, closer toward the optical axis; wherein the light guide member has a flat face corresponding to a plane that is formed by a line parallel to the optical axis and a line parallel to the edge side with the linear shape of the light-emitting face, and an inner side of the flat face is provided as a reflection face that reflects the light emitted from the optical source.

21 . The light source for headlight of claim 19 , wherein the reflection face is compartmented into a region placed in an oncoming traffic lane-side of the vehicle and a region placed in a walking path-side thereof, said region placed in the oncoming traffic lane-side being configured lower than the region placed in the walking path-side.

22 . The light source for headlight of claim 19 , wherein the light-emitting face of the optical source is placed upward from the optical axis.

23 . The light source for headlight of claim 19 , wherein the light-emitting face of the optical source is placed downward from the optical axis.

24 . The light source for headlight of claim 19 , wherein the light-emitting fare of the optical source comprises faces respectively placed upward and downward from the optical axis.

25 . The light source for headlight of claim 19 , wherein the light-emitting face of the optical source is compartmented into a plurality of compartments, and lighting-up and lighting-off are made for each of the compartments.

26 . The light source for headlight of claim 20 , wherein an outer side of the flat face of the light guide member is provided as a reflection face that reflects the light emitted from the optical source.

27 . The light source for headlight of claim 19 , wherein an outgoing face of the light guide member through which the light emitted from the optical source goes out, is inclined relative to a plane perpendicular to the optical axis.

28 . The light source for headlight of claim 27 , wherein an incident face of the light guide member on which the light emitted from the optical source is incident and the outgoing face are parallel to each other.

29 . The light source for headlight of claim 27 , wherein the outgoing face of the light guide member is inclined relative to an incident face thereof on which the light emitted from the optical source is incident.

30 . The light source for headlight of claim 27 , which comprises a second reflection face that reflects the light having been emitted from the optical source and reflected on an incident face of the light guide member, toward that incident face.

31 . The light source for headlight of claim 19 , wherein the light guide member includes: an incident face on which the light emitted from the optical source is incident; a second inner reflection face that reflects the incident light inside the light guide member; and an outgoing face through which the light reflected on the second inner reflection face goes out.

32 . The light source for headlight of claim 19 , wherein the optical source is configured to emit the light by exciting the light-emitting face formed using a fluorescent material.

33 . The light source for headlight of claim 19 , wherein the optical source is an LED.

34 . A headlight which uses the light source for headlight described in claim 19 .

35 . The headlight of claim 34 , wherein a light-emitting element that can be used as a light-receiving element is used in the light source for headlight, and when the light-emitting element serving also as the light-receiving element detects light incident on the headlight from an outside, the light-emitting element is not lit on.

Assignees

• Kishi Naohiro
• Minami Fumihiro
• Ohsawa Takashi
• Mitsubishi Electric Corp

Inventors

• Kishi Naohiro
• Minami Fumihiro
• Ohsawa Takashi

Classifications

• F21S41/43

  characterised by the shape thereof · CPC title

• F21Y2101/00

  Point-like light sources · CPC title

• F21S41/143 Primary

  the main emission direction of the LED being parallel to the optical axis of the illuminating device · CPC title

• F21W2102/00

  Exterior vehicle lighting devices for illuminating purposes · CPC title

• F21S41/255

  Lenses with a front view of circular or truncated circular outline · CPC title