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:
May. 13, 2003
Filed:
Apr. 27, 2001
Hiroshi Takami, Kanagawa-ken, JP;
Tomohiro Nakamori, Shizuoka-ken, JP;
Masaru Shimura, Shizuoka-ken, JP;
Seiji Saito, Shizuoka-ken, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes an image bearing member and a charge member for electrically charging the image bearing member while contacting the image bearing member. An oscillating voltage, including a component of AC voltage, is applied to the charge member. A first detector detects an average of the AC current applied to the charge member. A second detector detects a value of the AC current corresponding to a peak of the AC voltage. A controller effects control such that when a detected current value is smaller than a first predetermined value, the detected current value of the first detector is at the first predetermined value, and when the detected current value of the first detector is larger than the first predetermined value, a current value of the second detector is at a second predetermined value.