The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 1995
Filed:
Aug. 08, 1994
Hirohiko Oshio, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A vehicular headlamp that provides near-ultraviolet illumination of desired areas but which assures that sufficient brightness can be obtained in areas illuminated with visible light without having to combine the lamp with another type of headlamp. The headlamp includes a light-emitting unit accommodated in a lamp housing including a substantially parabolic reflector, a discharge bulb mounted inside the reflector to generate both visible light components and ultraviolet rays, and a light-emitting lens disposed in front of the reflector to irradiate the light reflected from the reflector in the forward direction. In addition, a bandpass filter adapted to absorptively remove visible light components and permit at least near-ultraviolet rays to pass therethrough is disposed in a light path other than the light path for the low-beam light conducted to the light emitting lens from the reflector so that a low-beam illuminating area is illuminated by both visible light components and near-ultraviolet rays to maintain sufficient brightness in the foregoing region. On the other hand, an illuminating area located above a clear cut line is illuminated mainly by the near-ultraviolet rays.