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:
Jul. 02, 2002
Filed:
Dec. 01, 2000
Applicant:
Inventors:
Assignee:
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 2/714 ; G09G 5/00 ;
U.S. Cl.
CPC ...
G02B 2/714 ; G09G 5/00 ;
Abstract
For prevention of ghost images from occurring on head-up displays, a glass surface is ground, and a reflecting surface with a wedge-shaped cross section is formed. Furthermore, in order to reduce optical distortion at the edge portion of the reflecting surface, a ground surface contacting the reflecting surface with an angle between 150° and 210° is formed. In accordance with the enlargement of the reflecting surface accompanied by the tendency of head-up displays becoming larger, the reflecting surface is divided into at least two regions, and the angle of the reflecting surface is optimized for each region.