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:
Nov. 08, 1994
Filed:
Oct. 08, 1992
Kenichi Matsumoto, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus, particularly a color image forming apparatus. A conveyer belt made of dielectric material is charged-up electrically by repetitive image transfer actions using corona charging. By the charge-up the transfer current decreases with the result of decrease of image density. In order to compensate with this, the average charge amount of the toner particles transferred to the image receiving material at later stage or stages of the repetitive image transfer actions is decreased with respect to the average charge amount of the toner particles transferred onto the image receiving material in the initial stage or stages of the repetitive image transfer actions. By doing so, the toner image densities in the respective colors are made uniform, so that sharp images can be produced.