Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Electrophotographic photoconductor and electrophotographic image forming apparatus using the photoconductor
 An electrophotographic photoconductor including an electroconductive substrate, and a charge generating layer including a charge generating material and a charge transporting layer including a charge transporting material, which are overlaid and which are formed overlying one side of the electroconductive substrate, wherein the charge generating material includes an asymmetric disazo pigment and a metal-free phthalocyanine pigment, and wherein a ratio of the asymmetric disazo pigment to the metal-free phthalocyanine pigment is from 1.5:1 to 5:1 by weight and the asymmetric disazo pigment has the following formula (I): EQU Cp1--N.dbd.N--A--N.dbd.N--Cp2 (I) wherein A represents a divalent group which is connected to each nitrogen atom of the adjacent azo groups through a carbon atom of said A group; and Cp1 and Cp2 independently represents a residual group of a coupler, wherein Cp1 is different from Cp2. 
Ricoh Company, Ltd.
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Yasuo Jun Takehiko
Suzuki Aoto Kinoshita