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:
Jan. 26, 1993
Filed:
Mar. 15, 1991
Jun Asai, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes an image bearing member movable along an endless path, an image forming system for forming a toner image on the image bearing member, and a transfer device for transferring the toner image from the image bearing member to a transfer material at a transfer position. The image forming system includes a charger for charging the image bearing member, and a developer. The transfer device includes a transfer member contactable to a backside of the transfer material. The transfer member is supplied with a voltage having a polarity which is the same as the charging polarity of the toner during a developing operation to transfer the toner from the transfer member to the image bearing member when the transfer material is absent at the transfer position. Also provided is a device for causing a region of the image bearing member to have a potential of the same polarity as the charging polarity of the charger before the region is charged by the charger for image formation.