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:
Oct. 17, 2000
Filed:
Dec. 09, 1997
Kazuo Fujibayashi, Kawasaki, JP;
Koji Hoshi, Yokohama, JP;
Manabu Kato, Kawasaki, JP;
Yoshihiro Ishibe, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical scanning apparatus in which the luminous flux emitted from a light source is deflected by a deflecting device and formed by an optical device into a spot-shaped image on a plane to be scanned. The optical device has first and second toric lenses. The first toric lens has both lens surfaces formed into aspherical shapes in the main scanning cross section and has a meniscus shape in which a concave surface faces the deflecting device in the vicinity of the center of scanning and which provides a positive refractive power. The second toric lens has both lens surfaces formed into aspherical shapes in the main scanning cross section and has a meniscus shape in which a convex surface faces the deflecting device in the vicinity of the center of scanning and which provides a positive refractive power. Sections of the toric lenses perpendicular to a generating line in a sub-scanning cross section both have meniscus shapes which provide concave surfaces facing the deflecting device and which provide a positive refractive power.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile