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:
Apr. 30, 2013
Filed:
Sep. 10, 2010
Masanori Horike, Kanagawa, JP;
Tetsuro Hirota, Kanagawa, JP;
Atsushi Kurokawa, Kanagawa, JP;
Hideki Kosugi, Kanagawa, JP;
Masaaki Yamada, Tokyo, JP;
Yoshiko Ogawa, Tokyo, JP;
Yuji Ishikura, Kanagawa, JP;
Masanori Horike, Kanagawa, JP;
Tetsuro Hirota, Kanagawa, JP;
Atsushi Kurokawa, Kanagawa, JP;
Hideki Kosugi, Kanagawa, JP;
Masaaki Yamada, Tokyo, JP;
Yoshiko Ogawa, Tokyo, JP;
Yuji Ishikura, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A disclosed developing device includes a toner carrying member having electrodes, a toner supply unit supplying the toner to the toner carrying member, and a hopping electric field generator unit generating electric field to cause the toner hopping on the toner carrying member by applying a pulse voltage to the electrodes. The hopping electric field generator unit includes a pulse voltage generator circuit generating the pulse voltage, a first direct-current power source supplying bias to the pulse voltage generator circuit for regulating a peak value of the pulse voltage, and a second direct-current power source having a same polarity with a toner charging polarity, and outputting a variable voltage level. The hopping electric field generator unit controls the peak value of the pulse voltage by changing an output of the first power source and a mean thereof by changing an output of the second power source.