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:
Apr. 04, 2000
Filed:
Dec. 04, 1997
Satoshi Shigezaki, Minami-Ashigara, JP;
Taichi Yamada, Minami-Ashigara, JP;
Yutaka Agawa, Iwatsuki, JP;
Toshio Masubuchi, Iwatsuki, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
An image forming apparatus of the present invention includes at least an image carrier and a contact type charging device. The image forming apparatus further includes a control control device that controls the contact type charging device so as to apply DC voltage having the same polarity as the charging polarity of the image carrier to the image carrier at the same time that or before rotation of the image carrier begins and successively applies a voltage in which AC voltage is superimposed on the DC voltage at the same time that or after the DC voltage is applied and at the latest after the rotation of the image carrier begins. Therefore, according to the present invention, electrostatic memory in the image carrier is prevented, so that the occurrence of black stripe or the like corresponding to a contact point of the contact type charging device is prevented, thereby enabling formation of high quality images.