发明授权
- 专利标题： Development device, process cartridge incorporating same, and image forming apparatus incorporating same
- 专利标题（中）： 显影装置，结合其的处理盒，以及包含其的图像形成装置
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申请号： US13007104申请日： 2011-01-14
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公开(公告)号： US08594540B2公开(公告)日： 2013-11-26
- 发明人: Tetsuro Hirota , Hideki Kosugi , Yoshiko Ogawa , Atsushi Kurokawa , Hideyasu Seki , Masaaki Yamada , Yuji Ishikura
- 申请人： Tetsuro Hirota , Hideki Kosugi , Yoshiko Ogawa , Atsushi Kurokawa , Hideyasu Seki , Masaaki Yamada , Yuji Ishikura
- 申请人地址： JP Tokyo
- 专利权人： Ricoh Company, Limited
- 当前专利权人： Ricoh Company, Limited
- 当前专利权人地址： JP Tokyo
- 代理机构： Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- 优先权： JP2010-013052 20100125; JP2010-013182 20100125; JP2010-227685 20101007
- 主分类号： G03G15/08
- IPC分类号： G03G15/08
摘要：
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.