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:
Sep. 24, 1991
Filed:
Aug. 06, 1990
Hirofumi Hasegawa, Osaka, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
An optical scanning image forming apparatus having a photoreceptor member, an irradiating optical unit for modulating an optical beam from a beam source in accordance with image information and then for forming an image by scanning this modulated optical beam on the photoreceptor member, and an optical beam passing slit plate disposed in a path of the optical beam between the photoreceptor member and the irradiating optical unit, and a cylindrical lens having a positive power in one direction of a width of the optical beam passing slit plate. The cylindrical lens is disposed adjacent the slit plate and is capable by means of its converging effect of offsetting beam spreading-out due to diffraction of the slit plate. By impressing the slit plate with an electric potential of the same polarity as that of toner adhered to the photoreceptor member, it is possible to prevent adhesion of the toner to the slit plate.