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:
Aug. 20, 1996
Filed:
Feb. 25, 1994
Toshiyuki Fukami, Osaka, JP;
Masashi Tanaka, Osaka, JP;
Mita Industrial Co., Ltd., Osaka, JP;
Abstract
A reversal developing system using a photosensitive material that can be electrically charged into both a positive polarity and a negative polarity, and a DC voltage applied to the transfer roller has a polarity opposite to and more than 1.5 times as great than that of the charge start potential by the primary charger, and is so set that the potential on the surface of the photosensitive material after discharge is 50 V or smaller in absolute value. Therefore, the discharging is effectively carried out after the image has been formed, the photosensitive material is uniformly and effectively charged by the main charger even in the subsequent cycle of forming image, a good image is formed without image spots, and the toner image formed on the photosensitive material is transferred maintaining a high transfer efficiency. The transfer roller is arranged to have a gap between the transfer roller and photosensitive surface between 0.3 to 0.7 mm.