Vehicle lamp unit

A technology for lamps and vehicles, which is applied in the direction of headlights, vehicle parts, vehicle lighting systems, etc., can solve the problem of inability to spread light with large horizontal and long light distribution patterns, and achieve the effect of improving the utilization rate of light beams
CN1654880AInactive Publication Date: 2005-08-17KOITO MFG CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
KOITO MFG CO LTD
Publication Date
2005-08-17
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A pair of upper and lower incidence surfaces are formed on a rear face of a translucent member disposed to cover three light-emitting elements. On upper and lower sides of the incidence surfaces are formed a pair of reflection surfaces for causing light emitted by the light-emitting elements and having entered the translucent member to internally reflect forward. Each of the incidence surfaces is formed from a cylindrical convex-curved surface extending horizontally. Each of the reflection surfaces is formed from a parabolic cylindrical curved surface whose focal line passes through a virtual image point of each of the light-emitting elements formed by the corresponding incidence surfaces. By the above configuration, light emitted by the light-emitting elements is caused to internally reflect in such a manner as to diffuse in the horizontal direction, and not to diffuse in the vertical direction, thereby exiting forward from a pair of exit surfaces.
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Description

technical field

[0001] The present invention relates to a vehicle lamp unit using a light emitting element such as a light emitting diode as a light source. Background technique

[0002] In recent years, vehicle lamp units using light emitting diodes as light sources have been widely used.

[0003] At this time, "Patent Document 1" describes a vehicle lamp unit including a light emitting diode arranged to face the front of the lamp unit, and a translucent member arranged to cover the light emitting diode from the front side.

[0004] This lamp unit for a vehicle has a structure in which the light from the light emitting diode incident on the rear end of the light-transmitting member is guided to the front end surface of the light-transmitting member, and is emitted from the front end surface through a projector arranged in front of the light emitting diode. The lens shines toward the front of the lamp unit.

[0005] Patent Document 1: JP-A-2002-50214

[0006] In vehicle l...

Claims

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