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:
Aug. 01, 1995
Filed:
Jan. 18, 1994
Jun Asai, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes a movable image bearing member; an image forming device for forming an image on the image bearing member; a charging member press-contacted to or faced to the image bearing member to transfer the image from the image bearing member onto the transfer material passed therebetween; a bias voltage applying device for applying a bias voltage to the charging member, wherein the voltage applying device constant-voltage-controlled the charging member in a period when an image region of the image bearing member is present in the transfer position, and constant-current-controls the charging member in another period, and wherein a voltage applied to the charging member during the constant voltage control is a sum of a voltage provided during the constant current control and a predetermined voltage.