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. 21, 2009
Filed:
Jun. 07, 2001
Satoshi Sano, Kawasaki, JP;
Yasuhide Iwamoto, Kawasaki, JP;
Fumihiko Nakazawa, Kawasaki, JP;
Nobuyasu Yamaguchi, Kawasaki, JP;
Satoshi Sano, Kawasaki, JP;
Yasuhide Iwamoto, Kawasaki, JP;
Fumihiko Nakazawa, Kawasaki, JP;
Nobuyasu Yamaguchi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Laser light emitted by a light emitting element is made parallel light by a collimation lens, passes through an aperture of an aperture mirror, and is then angularly scanned in a plane substantially parallel to a display screen by rotation of a polygon mirror and projected onto a recurrence reflection sheet. Then, after the reflected light from the recurrence reflection sheet is reflected by the polygon mirror and aperture mirror, the light is focused by a condenser lens to enter a light receiving element. The aperture mirror has an asymmetrical shape in the scanning direction and/or the vertical direction about the optical axis, according to a scanning surface opening width of the polygon mirror.