Patent ID: 8007972

Claim:
An electrophotographic photoconductor, comprising: a support; and at least a photosensitive layer disposed on the support, wherein the photosensitive layer comprises at least a charge generating material and a charge transporting material expressed by the following Structural Formula (1-1), and wherein, in the Structural Formula (1-1), R 1 and R 2 may be identical to each other or different, and represent any one of hydrogen atom, alkyl group which may be substituted, cycloalkyl group which may be substituted and aralkyl group which may be substituted; R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , and R 10 may be identical to each other or different, and represent any one of hydrogen atom, halogen atom, cyano group, nitro group, amino group, hydroxyl group, alkyl group which may be substituted, cycloalkyl group which may be substituted and aralkyl group which may be substituted; wherein the electrophotographic photoconductor comprises a bipolar optical sensitivity of positive and negative, and a ratio of optical sensitivity at each polarity, E½ (positive) and E½ (negative), [E½ (negative)/E½ (positive)], where “E½” is an exposure energy (μJ/cm 2 ) required for a surface potential to be 1/2 by exposing with a single light after the electrophotographic photoconductor is charged at ±800V, is 0.5 to 3.0.