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:
Apr. 03, 2001
Filed:
Jul. 27, 1999
Applicant:
Inventors:
Mamoru Murakoshi, Shizuoka, JP;
Toshiaki Tsuda, Shizuoka, JP;
Assignee:
Koito Manufacturing Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60Q 1/00 ;
U.S. Cl.
CPC ...
B60Q 1/00 ;
Abstract
A projection-type headlamp for an automotive vehicle including a projection lens made of glass through which light rays emitted from a discharge lamp bulb are radiated to an outer lens made of a synthetic resin. An ultraviolet absorbing film made solely of zinc oxide is formed on the inner surface of the projection lens, which film prevents discoloration (yellowing) and deterioration (cracking) of the outer lens due to ultraviolet irradiation from the discharge bulb. A protective film is provided over the ultraviolet absorbing film so as to retain the ultraviolet absorbing function of the latter for an extended service period.