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:
Jul. 15, 2014
Filed:
Sep. 03, 2010
Haruyuki Tsuji, Yokohama, JP;
Atsushi Fujii, Yokohama, JP;
Hideaki Matsuoka, Mishima, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An electrophotographic photosensitive member having a specific conductive layer and promising less variation in light-area potential and residual potential in reproducing images repeatedly, and a process cartridge and an electrophotographic apparatus which have such an electrophotographic photosensitive member are provided. Where a test in which a voltage of −1.0 kV having only a DC voltage component is continuously applied to the conductive layer for 1 hour is conducted, the conductive layer has volume resistivity satisfying the following mathematical expressions (1) and (2), as values before and after the test:−2.00≦(log|ρ|−log|ρ|)≦2.00  (1), and1.0×10≦ρ≦2.0×10  (2),where, in the expressions (1) and (2), ρis volume resistivity (Ω·cm) of the conductive layer as measured before the test and ρis volume resistivity (Ω·cm) of the conductive layer as measured after the test.