| US 7,477,856 B2 | ||
| Method and apparatus for image forming capable of effectively preventing resonance of frequencies | ||
| Takuzi Yoneda, Tokyo (Japan); Hiroshi Ono, Tokyo (Japan); Masanori Kawasumi, Kanagawa (Japan); Yuji Arai, Kanagawa (Japan); Toshio Koike, Kanagawa (Japan); Ken Amemiya, Tokyo (Japan); Tokuya Ohjimi, Kanagawa (Japan); Takatsugu Fujishiro, Tokyo (Japan); Masami Tomita, Shizuoka (Japan); Haruji Mizuishi, Tokyo (Japan); and Hitoshi Ishibashi, Kanagawa (Japan) | ||
| Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
| Filed on Nov. 14, 2005, as Appl. No. 11/271,814. | ||
| Claims priority of application No. 2004-329245 (JP), filed on Nov. 12, 2004. | ||
| Prior Publication US 2006/0133834 A1, Jun. 22, 2006 | ||
| Int. Cl. G03G 15/00 (2006.01) | ||
| U.S. Cl. 399—48 [399/50] | 17 Claims |
| 1. An image forming apparatus, comprising:
an image bearing member configured to bear an image;
a charging member configured to charge a surface of the image bearing member when a direct current bias voltage added to at
least an alternating bias voltage is applied to the charging member, the charging member having a frequency fc of the alternating
bias voltage; and
a measuring member configured to measure a potential of the surface of the image bearing member, the measuring member having
a drive frequency fvsen,
wherein a relationship of the frequency fc and the drive frequency fvsen is expressed as fc≠fvsen×n and fc×n+fvsen, where
n is an integer.
|