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:
Jul. 13, 1993
Filed:
Mar. 20, 1992
Kouji Hayashi, Yokohama, JP;
Takashi Bisaiji, Yokohama, JP;
Norimitsu Kikuchi, Yokohama, JP;
Takeyoshi Sekine, Tokyo, JP;
Noboru Sawayama, Tokyo, JP;
Takayuki Maruta, Tokyo, JP;
Tetsuro Miura, Tokyo, JP;
Kazunori Bannai, Tokyo, JP;
Kazunari Yamada, Tokyo, JP;
Nobuhiro Nakayama, Susono, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus having a developing device of the type using a two-component type developer and developing an electrostatic latent image by a bias electric field having an alternating electric field. A predetermined reference latent image is electrostatically formed on an image carrier by a reference latent image forming device and then developed by the developing device to become a reference toner image. An irregularity detecting circuit determines the degree of difference between the density of the edge and the density of the central portion of the reference toner image. A bias electric field control circuit controls the bias electric field in matching relation to the output of the irregularity detecting circuit, thereby preventing the image quality from being degraded by a change in the resistance of the carrier.