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:
Jan. 26, 1999
Filed:
Oct. 25, 1996
Asami Mae, Yokohama, JP;
Manabu Mochizuki, Yokohama, JP;
Kentaro Matsumoto, Ichikawa, JP;
Kenji Karashima, Kawasaki, JP;
Kazuhiko Yuki, Yokohama, JP;
Chikara Imai, Tokyo, JP;
Hajime Oyama, Ichikawa, JP;
Noriyuki Usui, Kawasaki, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus including a photoconductive drum, a charger which charges the photoconductive drum, an exposing device which irradiates light to the charged photoconductive drum for forming an electrostatic latent image on the photoconductive drum, a developing device which has two component developer which includes magnetic toner and magnetic carriers and a transfer charger to transfer the developed image to a sheet of paper. The bias voltages of the charger, the developing device and the transfer charger are applied from a common high voltage power source. A developing starting voltage of the developing device is higher than a residual voltage of the photoconductive drum.