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. 23, 2007
Filed:
Aug. 09, 2005
Masahide Kinoshita, Shizuoka-ken, JP;
Masaki Ojima, Shizuoka-ken, JP;
Motoki Adachi, Shizuoka-ken, JP;
Masao Uyama, Shizuoka-ken, JP;
Kazuhiro Okubo, Shizuoka-ken, JP;
Masahide Kinoshita, Shizuoka-ken, JP;
Masaki Ojima, Shizuoka-ken, JP;
Motoki Adachi, Shizuoka-ken, JP;
Masao Uyama, Shizuoka-ken, JP;
Kazuhiro Okubo, Shizuoka-ken, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes a photosensitive drum, a charge roller for charging the photosensitive drum, a developing device for developing an electrostatic latent image formed on the charged photosensitive drum with a developer, a first auxiliary charging brush which is located upstream from the charge roller in a movement direction of a surface of the photosensitive drum and applies a voltage of a polarity opposite to a normal polarity of a polarity opposite to a normal polarity of the developer, and a second auxiliary charging brush which is located downstream from the first auxiliary charging brush and upstream from the charge roller and applies a voltage of a polarity identical to the normal polarity of the developer. In the image forming apparatus, the first auxiliary charging brush is supplied with an AC voltage to be improved in recovery performance of a transfer residual developer, and contamination of charging means can be prevented.