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:
Dec. 10, 2013
Filed:
Jul. 07, 2009
Kenichi Shibuya, Toride, JP;
Kenichi Shibuya, Toride, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A charging device includes a charging member to charge an image bearing member; an applying device configured to apply to the charging member a charging bias voltage comprising a DC voltage component and an AC voltage component; an AC current detector; a DC current detector; and a controller. The controller determines a saturation peak-to-peak voltage Vat which the detected DC current saturates when a peak-to-peak voltage of the AC voltage is increased, calculates a relational expression using only a detected AC current when a peak-to- peak voltage which is not more than the saturation peak-to-peak voltage Vis applied, and determines the peak-to-peak voltage of the AC voltage applied to the charging member in an image forming operation on the basis of the relational expression and a detected AC current when a peak-to-peak voltage higher than the saturation peak-to-peak voltage Vis applied.