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. 15, 2010
Filed:
Nov. 16, 2007
Kei Yasutomi, Yokohama, JP;
Hitoshi Maruyama, Tokyo, JP;
Katsuaki Miyawaki, Yokohama, JP;
Takeo Tsukamoto, Yokohama, JP;
Masanori Saitoh, Komae, JP;
Katsuhiro Aoki, Yokohama, JP;
Kei Yasutomi, Yokohama, JP;
Hitoshi Maruyama, Tokyo, JP;
Katsuaki Miyawaki, Yokohama, JP;
Takeo Tsukamoto, Yokohama, JP;
Masanori Saitoh, Komae, JP;
Katsuhiro Aoki, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A corona charger includes a case provided in the vicinity of a device to be charged. The case includes an opening facing the device, a discharge electrode, a first charging region, and a second charging region. The discharge electrode provided inside the case and supplied with a voltage so as to generate a corona discharge charges a surface of the device from the opening by supplying the corona discharge to the surface. The first charging region includes no grid electrode at a position upstream of the opening in a surface moving direction of the device. The second charging region includes a grid electrode to which a predetermined voltage is applied at a position downstream of the opening. The voltage applied to the discharge electrode is an alternating current (AC) voltage superimposed on a direct current (DC) voltage.