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:
Jun. 15, 1993
Filed:
Aug. 01, 1990
Muneo Kuroda, Osaka, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
A toroidal lens and two pieces of spherical mirrors cooperatively function to have a uniform velocity of a light beam over a range from the center to both edges of a scanning area when the light beam deflected at an equiangular velocity by a rotative deflection device is directed toward a light collecting surface. The toroidal lens further maintains a conjugate relation of each reflective surface of the rotative deflection device and the light collecting surface by which an error in the inclination of image on each reflective surface is rectified, and at the same time, the direction of radiation of the light beam is regulated so as to make the curvature of the field smaller.