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:
Oct. 03, 2017
Filed:
Jul. 14, 2016
Sharp Kabushiki Kaisha, Osaka, JP;
Yasuhiro Nishimura, Osaka, JP;
Tohru Sakuwa, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
To provide a charging device which can be reduced in size and increased in speed while suppressing the occurrence of charging irregularities on the surface of the photosensitive drum, a process cartridge, and an image forming apparatus. A charging deviceY which charges a surface of a photosensitive drumY, comprises a discharge electrodewhich applies a potential to the surface of the photosensitive drumY and charges the surface, and a grid electrodewith a porous place shape disposed between the discharge electrodeand the surface of the photosensitive drumY so as to face the surface of the photosensitive drumY and which controls the charging potential of the surface, wherein the grid electrodeis divided into a plurality of regions approximately parallel to a direction orthogonal to a direction of rotation of the photosensitive drumY, and the plurality of regions is characterized in that an opening ratio of a midstream regionclose to the photosensitive drumY is greater than an opening ratios of an upstream regionand a downstream region