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:
May. 19, 1981
Filed:
Aug. 28, 1978
Yutaka Ebi, Tokyo, JP;
Koji Hirakura, Tokyo, JP;
Fuyuhiko Matsumoto, Tokyo, JP;
Wasaburo Ohta, Tokyo, JP;
Satoru Tomita, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A photoconductive drum is formed with a photoconductive dielectric layer for producing an electrostatic image and an endless transfer belt is formed with a dielectric layer thereon. A toner substance is applied to the drum to produce a toner image, and a copy sheet is pressed between the belt and drum to transfer the toner image to the copy sheet. An electric potential of the same polarity as the electrostatic image is applied to the copy sheet to attract the toner from the drum onto the copy sheet. The potential has a magnitude which is slightly less than a magnitude at which charge transfer from the belt to the drum occurs due to dielectric breakdown through the copy sheet or field emission from the copy sheet to the drum which would degrade the electrostatic image. The method enables a large number of copies to be produced from a single electrostatic image through repeated development and transfer.