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:
Nov. 26, 2013
Filed:
Jan. 14, 2011
Tetsuro Hirota, Kanagawa, JP;
Hideki Kosugi, Kanagawa, JP;
Yoshiko Ogawa, Tokyo, JP;
Atsushi Kurokawa, Kanagawa, JP;
Hideyasu Seki, Tokyo, JP;
Masaaki Yamada, Tokyo, JP;
Yuji Ishikura, Kanagawa, JP;
Tetsuro Hirota, Kanagawa, JP;
Hideki Kosugi, Kanagawa, JP;
Yoshiko Ogawa, Tokyo, JP;
Atsushi Kurokawa, Kanagawa, JP;
Hideyasu Seki, Tokyo, JP;
Masaaki Yamada, Tokyo, JP;
Yuji Ishikura, Kanagawa, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
A development device includes a toner carrier including first and second groups of electrodes, a toner supplier, and an electrical field generator. The electrical field generator includes a positive-phase pulse voltage generation circuit, a negative-phase pulse voltage generation circuit, a first DC power source for supplying a bias for setting a peak value of pulse voltages, a second DC power source to output a variable voltage having a polarity identical to a polarity of toner charge, a first diode having an anode connected to a lower potential side of the first DC power source and a cathode connected to an output terminal of the positive-phase pulse voltage generation circuit, and a second diode having an anode connected to the lower potential side of the first DC power source and a cathode connected to an output terminal of the negative-phase pulse voltage generation circuit.