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:
Jun. 02, 1987
Filed:
Mar. 22, 1983
Manabu Mochizuki, Yokohama, JP;
Itsuo Ikeda, Sagamihara, JP;
Tsuneo Kurotori, Tokyo, JP;
Satoshi Shinguryo, Kawaguchi, JP;
Seiichi Miyakawa, Nagareyama, JP;
Yuichi Kobayashi, Yokohama, JP;
Mitsuhiro Nonaka, Yokohama, JP;
Haruhiko Fukuda, Matsudo, JP;
Ricoh Company, Ltd., , JP;
Abstract
A developing device for developing an electrostatic latent image formed on an imaging surface includes a developing electrode disposed opposite to the imaging surface and a control circuit for controlling the potential of the developing electrode. In one form, when the control circuit causes the developing electrode to be electrically floating, the upper limit of the voltage excursion is set at different levels as desired. In another form, the control circuit includes a sensor for sensing the potential of the imaging surface thereby allowing to carry out so-called fixed bias or auto-bias developing modes. In a further form, the mode of developing operation is automatically set depending upon the position of a pressure plate which is to be placed on an original for keeping the original in position during copying process.