Fuji Electric Co., Ltd.

Toshiki Obinata

Masaru Takeuchi

Hirotaka Kobayashi

Fengqiang Zhu

Toshiki Takeuchi

An electrophotographic photoreceptor of a negatively-chargeable laminate-type includes a conductive substrate; a charge generation layer provided on the conductive substrate and including a charge generating material; and a charge transport layer provided on the charge generation layer and containing, as a binder resin, a copolymerized polycarbonate resin having a repeating unit represented by Formula (1); as a hole transporting substance, a compound having a structure represented by Formula (2); as an electron transporting substance, a compound having a structure represented by Formula (3), and, as an antioxidant, a compound represented by Structural Formula (4), where a mass ratio H/(B+H) represents a ratio of mass (H) of the hole transporting substance with respect to a sum of mass (B) of the binder resin and the mass (H) of the hole transporting substance, and satisfies Formula (5), 0.20 by mass&#x2264;H/(B+H)&#x2264;0.35 by mass, 

Electrophotographic photoreceptor, method for manufacturing same, and electrophotographic apparatus using same

In a negatively-chargeable laminate-type electrophotographic photoreceptor, a charge generation layer and another charge transport layer are arranged on a conductive substrate directly or via an intermediate layer. The charge transport layer contains at least a hole-transporting substance, an electron-transporting substance and a binder resin; the mass ratio (R) [% by mass] between mass (P) of the hole-transporting substance and mass (N) of the electron-transporting substance is represented by the following equation (1), and satisfies the following equation (2):=(/())&#xd7;100&#x2003;&#x2003;(1)1&#x2266;&#x2266;40&#x2003;&#x2003;(2); andwhen a voltage of +6 kV is applied to the photoreceptor for 5 seconds via a resin sheet having a thickness of 50 &#x3bc;m and a surface resistivity of 2&#xd7;10&#x3a9;/cm, the surface potential difference (&#x394;Vo) and half-tone potential difference (&#x394;Vh) between before and after the voltage application are both 15 V or less.

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Azumino, Japan

Toshiki Obinata