| US 7,502,583 B2 | ||
| Transfer device and image forming apparatus for enhancement of an image stored on a recording medium | ||
| Yuuji Sawai, Kanagawa (Japan); Ryuuichi Minbu, Kanagawa (Japan); Kazuchika Saeki, Saitama (Japan); and Atsushi Tano, Kanagawa (Japan) | ||
| Assigned to Ricoh Company, Limited, Tokyo (Japan) | ||
| Filed on Aug. 22, 2005, as Appl. No. 11/207,730. | ||
| Claims priority of application No. 2004-263499 (JP), filed on Sep. 10, 2004. | ||
| Prior Publication US 2006/0056884 A1, Mar. 16, 2006 | ||
| Int. Cl. G03G 15/16 (2006.01) | ||
| U.S. Cl. 399—302 [399/308] | 13 Claims |
| 1. A transfer device comprising:
a loop-shaped intermediate transfer member configured to hold a toner image, wherein a logarithm (LogR) of volume resistivity
of the intermediate transfer member is 10.0 or less;
an external roller that is arranged outside of a loop of the intermediate transfer member and that is configured to hold a
recording medium in cooperation with the intermediate transfer member, wherein a surface hardness of the external roller is
50 degrees or more in an asker C scale; and
an internal roller that is arranged inside of the loop of the intermediate transfer member and that is configured to hold
the intermediate transfer member in cooperation with the external roller, wherein
a surface hardness of the internal roller is 50 degrees or more in an asker C scale,
a surface resistance of the external roller is lower than that of the internal roller, and
the external roller includes a layer of high resistance.
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