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:
Mar. 22, 2016
Filed:
Jun. 26, 2014
Canon Kabushiki Kaisha, Tokyo, JP;
Tomohito Taniguchi, Suntou-gun, JP;
Takehiko Aoyama, Suntou-gun, JP;
Taichi Sato, Numazu, JP;
Noboru Miyagawa, Suntou-gun, JP;
Masahiro Watanabe, Mishima, JP;
Atsushi Uematsu, Fuji, JP;
Yoshitaka Suzumura, Mishima, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
There are provided an image-forming apparatus that inhibit the occurrence of a longitudinal streak image attributed to a cleaning failure, and a process cartridge. The image-forming apparatus and the process cartridge each have a charging member with a surface having a concavities derived from an opening of the bowl-shaped resin particle, and a protrusions derived from an edge of the opening of the bowl-shaped resin particle, the coverage ratio X1 of a surface of the toner with the silica fine particles is 50.0 area % or more and 75.0 area % or less, and when a theoretical coverage ratio of the toner by the silica fine particles is X2, a diffusion index represented by the formula 1 satisfies the formula 2:diffusion index=  (formula)diffusion index≧−0.0042×  (formula)