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Home Lighting Vehicle-lamp

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 Vehicle lamp

Details
Inventors: Amano, Yasuyuki;
Assignee: Koito Manufacturing Co., Ltd. (Tokyo, JP)
Primary Examiner: Sember; Thomas M.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue Mion, PLLC

A vehicle lamp is constructed such that light exiting from an LED light source is converted into collimated light and such that the collimated light is reflected forward of the lamp by means of a reflector. At that time, the reflector portion has a stepwise reflection surface in which there are alternately formed a plurality of light incidence sections into which the collimated light enter and a plurality of intermediate sections into which no collimated light enters. Further, each of the intermediate sections is formed from an irregular surface formed so as to recess rearward of the lamp with respect to a plane parallel to the direction of radiation of the collimated light. By means of the irregular surface, stray light or the like included in the collimated light exiting from the optical member is reflected forward of the lamp. As a result, when the lamp is viewed from the front, the light incidence sections appear to glare, resembling spread spots, and the intermediate sections also appear to glare.

DETAILED DESCRIPTION The invention has been conceived under the foregoing circumstances and aims at providing a vehicle lamp which is equipped with an LED light source and can make a reflection surface of a reflector glare in substantially a uniform manner.
The invention attempts to achieve the foregoing object by designing the geometry of an intermediate section of a reflection surface.
The invention provides a vehicle lamp having a light source (in the embodiment, a LED light source), an optical member for converting light originating from the LED light source into collimated light, and a reflector portion for reflecting the collimated light exiting from the optical member forward of the lamp, wherein the reflector portion has a stepwise reflection surface in which there are alternately formed a plurality of light incidence sections into which the collimated light enters and a plurality of intermediate sections into which no collimated light enters; and at least a portion of the intermediate sections is formed from an irregular surface formed so as to recess rearward of the lamp with respect to a plane parallel to the direction of radiation of the collimated light.
Here, the term "vehicle lamp" is not limited to a vehicle lamp of specific type.
For instance, a tail lamp, a stop lamp, or another lamp can be adopted.
In addition, no particular limitation is imposed on the specific configuration of the "optical member," so long as the optical member can convert the light originating from the LED light source into collimated light.
For example, a Fresnel lens, a convex lens, or a concave mirror can be adopted.
At that time, the "optical member" may or may not have another cross section for converting the light originating from the LED light source into collimated light, so long as the optical member is configured such that the light originating from the LED light source is converted into collimated light by-means of one cross sectional surface extending in the longitudinal direction of the lamp including the luminescent center of the LED light source



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