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. 08, 1984
Filed:
Jul. 16, 1982
Kazuhiro Yuasa, Zama, JP;
Noboru Furukawa, Atsugi, JP;
Ricoh Company, Ltd., , JP;
Abstract
A method and apparatus for forming an electrostatic latent image free of phantoms is provided. A recording medium is first uniformly charged and the charges are selectively dissipated by the recording unit including a plurality of styluses to which a recording potential is selectively applied and auxiliary electrodes to which an auxiliary potential is applied to form an electrostatic latent image on the medium. The present invention is characterized by applying a bias potential, preferably equal to or substantially equal to the surface potential of the charged medium, to the styluses and auxiliary electrodes thereby allowing to prevent unwanted recording from occurring.