Vehicular headlamp

Patent metadata

Field	Value
Publication number	US-9441803-B2
Application number	US-201113305018-A
Country	US
Kind code	B2
Filing date	Nov 28, 2011
Priority date	Dec 2, 2010
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

Disclosed is a vehicular headlamp which includes a lamp unit placed in a lamp unit outer case constituted by an outer cover and a lamp housing. The lamp unit includes a light emitting diode provided as a light source; a circuit substrate mounted with the light emitting diode and having a connection terminal for supplying power to the light emitting diode; a projection lens configured to project light emitted from the light emitting diode and irradiate the projected light forwardly; and a cover member placed to surround the light emitting diode and include a colored part of which an inner peripheral surface is formed as an incident surface, on which a part of the light emitted from the light emitting diode is incident, and in which a predetermined color other than a yellow color is given to a surface other than the incident surface.

First claim

What is claimed is:

1. A direct irradiation type vehicular headlamp, comprising:
a lamp unit outer case constituted by an outer cover and a lamp housing;
a circuit substrate mounted with a light emitting diode of a yellow color serving as a light source and having a connection terminal for supplying power to the light emitting diode;
a placement member configured to place the circuit substrate;
a projection lens configured to receive light emitted from a main optical axis of the light emitting diode directly without using a reflector and project the received light forwardly; and
a cover member including a colored part and an attached part, and being inwardly extended to surround the light emitting diode from a front surface of the placement member such that the cover member blocks a portion of the light diffused to a peripheral side of the projection lens but does not block the main optical axis of the light emitting diode, and absorbs the portion of the light diffused to the peripheral side of the projection lens,
wherein a rear surface of the colored part is substantially the same position as a front surface of the light emitting diode in a forward-backward direction,
an inner peripheral surface of the colored part is formed as an incident surface on which the portion of the light diffused to a peripheral side of the projection lens is incident,
one end of the attached part is coupled to an outer peripheral surface of the colored part and the other end is attached to the surface of the placement member,
a predetermined color other than the yellow color of the light emitting diode is given to the incident surface of the colored part of the cover member,
the cover member is disposed such that at least an outer periphery of the circuit substrate is blocked by the cover member when viewed from a front side of the vehicular headlamp, and
the attached part includes a base portion formed in a box shape opened toward upwardly, a placement groove that is opened inwardly and rearwardly and extended in a circumferential direction thereof is formed on a rear side surface of the base portion, and the outer periphery of the circuit substrate is inserted into the placement groove.

2. The vehicular headlamp of claim 1 , wherein the colored part is formed by coupling a front side portion and a rear side portion having the same shape and size with each other in a forward-backward direction and having parabolic surfaces formed as a front side reflection portion and a rear side reflection portion, respectively.

3. The vehicular headlamp of claim 2 , wherein the front side reflection portion and the rear side reflection portion are the incident surfaces.

4. The vehicular headlamp of claim 2 , wherein the light emitted from the main optical axis of the light emitting diode is reflected twice on the front side reflection portion and the rear side reflection portion to be directed to the projection lens.

5. The vehicular headlamp of claim 2 , wherein one end of the rear side portion is coupled to the front side portion and the other end of the rear side portion is positioned above or below an outer peripheral surface of the light emitting diode.

6. The vehicular headlamp of claim 1 , wherein the incident surface of the cover member is formed to be inclined toward outside of the lamp unit outer case as the incident surface goes forward.

7. The vehicular headlamp of claim 6 , further comprising a power feeding attachment with a power feeding terminal and attached to the placement member while pushing the circuit substrate to the placement member to connect the power feeding terminal to the connection terminal of the circuit substrate, wherein the power feeding attachment is used as the cover member.

8. The vehicular headlamp of claim 1 , further comprising a power feeding attachment with a power feeding terminal and attached to the placement member while pushing the circuit substrate to the placement member to connect the power feeding terminal to the connection terminal of the circuit substrate, wherein the power feeding attachment is used as the cover member.

9. The vehicular headlamp of claim 1 , wherein a rear surface of the colored part having the same size and shape as those of a front surface of the base portion is attached to the front surface of the base portion such that the cover member horizontally surrounds the light emitting diode.

10. The vehicular headlamp of claim 1 , wherein the cover member is configured to serve as a power feeding attachment for feeding a power to the light emitting diode.

11. The vehicular headlamp of claim 1 , wherein a connector portion protruded upward from a top surface of the base portion is formed in a box shape which is opened toward upwardly.

Assignees

• Tsukamoto Michio
• Koito Mfg Co Ltd

Inventors

• Tsukamoto Michio

Classifications

• F21V7/06

  with parabolic curvature · CPC title

• F21S41/323

  the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature · CPC title

• F21S41/255

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

• F21S41/151

  arranged in one or more lines · CPC title

• F21V7/0033

  with successive reflections from one reflector to the next or following · CPC title