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:
Nov. 30, 1993
Filed:
Mar. 20, 1992
Masao Yamaguchi, Kawaguchi, JP;
Ken Omura, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An optical unit includes a primary lens for converging a laser beam L emitted from a semiconductor laser element, a cylindrical lens for further converging the converged laser beam, and first and second plastic lenses having optical characteristics offsetting each other in at least one of first and second directions perpendicular to each other. By virtue of the primary lens and cylindrical lens, devices included in the optical deflector on the front side thereof can be made small, and also the arrangement of the lenses can be simplified. Devices of the same on the rear side thereof incorporate lenses including a planar surface, which reduces the required manufacturing cost.