Image forming apparatus and image forming method

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United States of America Patent

PATENT NO 9563153
SERIAL NO

15046185

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
RICOH COMPANY LTD3-6 NAKAMAGOME 1-CHOME OHTA-KU TOKYO 143-8555

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Aoki, Shinji Kanagawa, JP 236 3843
Iimura, Haruo Kanagawa, JP 31 888
Nakamura, Keigo Kanagawa, JP 146 1654
Ogino, Yasuhiko Kanagawa, JP 32 660
Saeki, Kazuchika Saitama, JP 39 523
Sugimoto, Naomi Kanagawa, JP 61 1277
Tanaka, Shinya Kanagawa, JP 312 4466

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