Ricoh Company, Ltd.

Yamanashi Electronics Co., Ltd.

Shindengen Electric Manufacturing Company Limited

Tetsuya Sakuma

Hajime Suzuki

Hideki Nakamura

Toshihiko Koizumi

Eiji Kurimoto

Keisuke Shimoyama

Takaaki Ikegami

Kohsuke Yamamoto

Kenichi Fujimori

Yoshitaro Nakayama

Tsuyoshi Ueda

Mitsuru Noro

An electrophotographic photoconductor including a conductive substrate and a photoconductive layer thereover, wherein the photoconductive layer contains a charge generation agent and a charge transport agent represented by General Formula (A-I), (B-I) or (C-I), and an amine compound represented by General Formula (II):    

Electrophotographic photoconductor, and electrophotographic method, electrophotographic apparatus and process cartridge containing the electrophotographic photoconductor

An electrophotographic photoreceptor which can respond to a reduction in diameter of photoreceptor and a process having high circumferential speed, due to the demand in the miniaturization and increase in the speed of copiers and printers. The photoreceptor has high sensitivity in long-wavelength region, and is free from deterioration of electric characteristics even after repeated use, and is highly stable. The electrophotographic photoreceptor has a conductive support member and a photosensitive layer laminated thereon, which includes at least a charge-generating agent, a charge-transfer agent, and a binder resin. The charge-generating agent is oxytitanium phthalocyanine, which has a Bragg angle (2&#x3b8;&#xb1;0.2&#xb0;) providing a maximum peak at 27.2&#xb0; in the X-ray diffraction spectra using CuK&#x3b1; as a radiation source.

Electrophotographic photoreceptor and electrophotographic apparatus

An electrophotographic photoreceptor in which the surface of a photosensitive layer has a small friction coefficient without impairing the excellent electrophotographic characteristics and which has an enhanced oil resistance and does not cause light fatigue, the electrophotographic photoreceptor comprising an electroconductive support having formed thereon a photosensitive layer comprising at least a charge-generating agent, a charge-transfer agent and a binder resin, wherein the photosensitive layer contains a polycarbonate copolymer comprising a recurring unit represented by the general formula (I) as the binder resin: ##STR1## and a butadiene compound represented by the general formula (IV) as the charge-transfer agent: ##STR2##

Electrophotographic photoreceptor with polycarbonate copolymer and

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Yamanashi, Japan

Tetsuya Sakuma