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:
Feb. 17, 2015
Filed:
May. 07, 2012
Etsuji Kojima, Kashiwa, JP;
Etsuji Kojima, Kashiwa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes a first image forming portion including a first photosensitive member, a first charging member to electrically charge the first photosensitive member, and a first exposure member to expose to light the charged first photosensitive member to form an electrostatic latent image, and a second image forming portion including a second photosensitive member, a second charging member to electrically charge the second photosensitive member, and a second exposure member to expose to light the charged second photosensitive member to form an electrostatic latent image. In addition, a power source applies a common voltage to a first transfer portion and a second transfer portion, and a setting portion variably sets, for a period in which a transfer operation is performed, a potential of the exposed portion or the charged portion of the first photosensitive member and a potential of the exposed portion or the charged portion of the second photosensitive member on the basis of a plurality of currents passing through the first transfer portion and a plurality of currents passing through the second transfer portion, respectively, when the plurality of common voltages are applied to the first transfer portion and the second transfer portion in a period other than the period in which the transfer operation is performed.