公开(公告)号：USRE47726E1

公开(公告)日：2019-11-12

申请号：US15081509

申请日：2016-03-25

Applicant: Ricoh Company, Ltd.

Inventor： Shinji Aoki ,  Haruo Iimura ,  Yasuhiko Ogino ,  Tadashi Kasai ,  Naomi Sugimoto ,  Shinya Tanaka ,  Keigo Nakamura

IPC: G03G15/16 ,  G03G15/01

Abstract: An image forming apparatus includes a nip forming member and a transfer bias output device that outputs a transfer bias to form a transfer electric field in a transfer nip between the nip forming member and an intermediate transfer member. Upon transfer of a composite toner image including a particular toner image onto a recording medium in the transfer nip, the transfer bias output device outputs the transfer bias including a first superimposed bias in which a direct current (DC) component is superimposed on an alternating current (AC) component. Upon transfer of the composite toner image without the particular toner image onto the recording medium in the transfer nip, the transfer bias output device outputs one of the transfer bias including a second superimposed bias having a peak-to-peak value of the AC component smaller than that of the first superimposed bias and the transfer bias including only the DC component.

公开(公告)号：US09535375B2

公开(公告)日：2017-01-03

申请号：US15013627

申请日：2016-02-02

Applicant: RICOH COMPANY, LTD.

Inventor： Shinya Tanaka ,  Hirokazu Ishii ,  Yasunobu Shimizu ,  Keigo Nakamura

IPC: G03G15/16

CPC classification number: G03G15/1665 ,  G03G15/1675

Abstract: An image forming apparatus includes a transfer bias output device and an information receiving device. The transfer bias output device outputs a transfer bias including a superimposed bias composed of an AC bias superimposed on a DC bias to form a transfer electric field in a transfer nip between an image bearing member bearing a toner image and a nip forming member, to transfer the toner image onto a recording medium in the transfer nip. A controller operatively connected to the information receiving device and the transfer bias output device causes the transfer bias output device to change a target output of a peak-to-peak voltage of the AC bias based on information received by the information receiving device that affects transfer of the toner image and to reduce a target output of the DC bias as the target output value of the peak-to-peak voltage of the AC bias increases.

Abstract translation: 图像形成装置包括转印偏压输出装置和信息接收装置。 转印偏压输出装置输出包括由叠加在DC偏压上的AC偏压组成的叠加偏压的转印偏压，以在承载调色剂图像的图像承载部件和辊隙形成部件之间的转印辊隙中形成转印电场，以转印 调色剂图像转印到转印辊隙中的记录介质上。 可操作地连接到信息接收装置和转移偏置输出装置的控制器使得转移偏置输出装置基于影响转移的信息接收装置接收的信息来改变AC偏压的峰峰值电压的目标输出 并且当AC偏压的峰 - 峰电压的目标输出值增加时，减小DC偏压的目标输出。

公开(公告)号：US10185255B2

公开(公告)日：2019-01-22

申请号：US15432392

申请日：2017-02-14

Applicant: Ricoh Company, Ltd.

Inventor： Naoto Kochi ,  Hirokazu Ishii ,  Seiichi Kogure ,  Naohiro Kumagai ,  Kenji Sugiura ,  Shinya Tanaka ,  Hiroki Nakamatsu ,  Yuuji Wada ,  Junpei Fujita ,  Takahiro Suzuki ,  Kazuki Yogosawa ,  Atsushi Nagata

IPC: G03G15/16 ,  G03G5/00 ,  G03G5/147

Abstract: An image forming apparatus includes an image bearer to bear a toner image, a nip forming member contacting the image bearer to form a transfer nip, and a transfer power source. The transfer bias has a transfer peak value to electrostatically move toner from the image bearer to the recording sheet and an opposite-peak value to electrostatically move less toner from the image bearer to the recording sheet than the transfer peak value. An opposite-peak duty of the transfer bias is less than 50%. The opposite-peak duty is tr/T×100% where T is one cycle of the transfer bias and tr is a time period during which the transfer bias is on a side of the opposite-peak value relative to an offset voltage of the transfer bias in the one cycle T.

公开(公告)号：US10088781B2

公开(公告)日：2018-10-02

申请号：US15389810

申请日：2016-12-23

Applicant: RICOH COMPANY, LTD.

Inventor： Shinya Tanaka ,  Naomi Sugimoto ,  Haruo Iimura ,  Shinji Aoki ,  Yasuhiko Ogino ,  Kazuchika Saeki ,  Keigo Nakamura

IPC: G03G15/16 ,  G03G15/01 ,  G03G15/00

Abstract: An image forming apparatus includes a transfer member configured to abut against an image carrier for carrying a toner image to form a transfer nip; and a power supply configured to output a bias voltage for transferring the toner image on the image carrier onto a recording medium nipped in the transfer nip. The bias voltage includes a first voltage for transferring the toner image from the image carrier onto the recording medium in a transfer direction and a second voltage having an opposite polarity of the first voltage, the first and the second voltages being alternately output. A time-averaged value of the bias voltage is set to a polarity in the transfer direction and is set in the transfer direction side with respect to a median between a maximum and a minimum of the bias voltage.

公开(公告)号：US09563153B2

公开(公告)日：2017-02-07

申请号：US15046185

申请日：2016-02-17

Applicant: RICOH COMPANY, LTD.

Inventor： Shinya Tanaka ,  Naomi Sugimoto ,  Haruo Iimura ,  Shinji Aoki ,  Yasuhiko Ogino ,  Kazuchika Saeki ,  Keigo Nakamura

IPC: G03G15/16 ,  G03G15/01

CPC classification number: G03G15/1675 ,  G03G15/0131 ,  G03G15/0189 ,  G03G15/1665 ,  G03G15/80

Abstract: An image forming apparatus includes a transfer member configured to abut against an image carrier for carrying a toner image to form a transfer nip; and a power supply configured to output a bias voltage for transferring the toner image on the image carrier onto a recording medium nipped in the transfer nip. The bias voltage includes a first voltage for transferring the toner image from the image carrier onto the recording medium in a transfer direction and a second voltage having an opposite polarity of the first voltage, the first and the second voltages being alternately output. A time-averaged value of the bias voltage is set to a polarity in the transfer direction and is set in the transfer direction side with respect to a median between a maximum and a minimum of the bias voltage.

Abstract translation: 图像形成装置包括：传送构件，被配置为抵靠用于承载调色剂图像的图像载体以形成转印夹持部; 以及电源，被配置为输出用于将图像载体上的调色剂图像转印到夹在转印夹持部中的记录介质上的偏置电压。 偏置电压包括用于将调色剂图像从传送方向从图像载体转印到记录介质上的第一电压和具有与第一电压相反极性的第二电压，第一和第二电压被交替地输出。 将偏置电压的时间平均值设定为传送方向上的极性，并相对于偏置电压的最大值和最小值之间的中值设定在传送方向侧。