| US 7,507,511 B2 | ||
| Electrophotographic photoreceptor, and image forming apparatus and process cartridge therefor using the electrophotographic photoreceptor | ||
| Nozomu Tamoto, Numazu (Japan); Tatsuya Niimi, Numazu (Japan); Maiko Koeda, Numazu (Japan); Tetsuro Suzuki, Fuji (Japan); Takehiko Kinoshita, Mishima (Japan); Suzuka Nozoe, Odawara (Japan); and Katsuichi Ohta, Mishima (Japan) | ||
| Assigned to Ricoh Company Ltd., Tokyo (Japan) | ||
| Filed on Jan. 17, 2006, as Appl. No. 11/332,545. | ||
| Claims priority of application No. 2005-007664 (JP), filed on Jan. 14, 2005. | ||
| Prior Publication US 2006/0177749 A1, Aug. 10, 2006 | ||
| Int. Cl. G03G 15/04 (2006.01) | ||
| U.S. Cl. 430—60 [430/64; 430/65; 399/159] | 27 Claims |
| 1. An electrophotographic photoreceptor, comprising:
an electroconductive substrate;
a first undercoat layer including no metal oxide, located overlying the electroconductive substrate;
a second undercoat layer comprising a metal oxide and a binder resin, located overlying the first undercoat layer, wherein
the binder resin comprises a block isocyanate compound; and
a photosensitive layer located overlying the second undercoat layer,
wherein the metal oxide in the second undercoat layer has a specific resistivity not less than 107 Ω·cm.
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