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:
Aug. 18, 1998
Filed:
Nov. 26, 1996
Yoshio Ozawa, Watarai-gun, JP;
Norio Tomiie, Watarai-gun, JP;
Hiroyoshi Tode, Watarai-gun, JP;
Yukio Ikeda, Watarai-gun, JP;
Kyocera Corporation, Kyoto, JP;
Abstract
To form sharp image free from flow of image or fog with an electrophotographic apparatus, which uses an a-Si photo-sensitive drum charged uniformly by having resort to the discharge phenomenon, the electrophotographic apparatus comprises an electrophotographic photo-sensitive drum having a surface layer being represented by an elementary ratio composition formula ( a-Si.sub.1-x C.sub.x :H ), x being 0.95.ltoreq..times.<1, the dynamic indentation hardness of the upper surface layer being 300 kgf/mm.sup.2 or below, the hardness of said surface layer being higher on the inner side of said photoconductive layer than on the outer surface side, preferably being gradually increasing as one goes toward the inner side of said photoelectric layer from the outer surface side, and a developing unit using a developer composed of carrier and toner particles being caused to rub the drum surface and recovered said developer in a developer vessel. The temperature of said photosensitive drum surface and said developer vessel being held in a range 0 to +10.degree. C., the developer used for the development contained a conductive abrasive having a volume resistivity ranging from 10.sup.2 to 10.sup.10 .OMEGA..multidot.cm, the peripheral speed of a transfer roller is set to be slightly higher than the peripheral speed of the drum.