Patent ID: 8178266

Claim:
An electrophotographic photoreceptor, comprising: a conductive substrate; an undercoat layer located overlying the conductive substrate; a charge generation layer located overlying the undercoat layer; and a charge transport layer located overlying the charge generation layer, wherein the under coat layer comprises a binder resin and multiple inorganic pigments each having different average primary particle diameters in a total amount of from 75 to 86% by weight; wherein the charge generation layer comprises a binder resin and a titanyl phthalocyanine pigment having a maximum diffraction peak at a Bragg angle 2θ (±0.2°) of 27.2° with respect to a characteristic X-ray specific to CuKα having a wavelength of 1.542 {acute over (Å)} in an amount of from 70 to 85% by weight; wherein the charge transport layer comprises a distyryl compound having the following formula (1): wherein each of R1 to R30 independently represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, an alkoxyl group having 1 to 3 carbon atoms, an aryl group substituted with an alkyl group having 1 to 3 carbon atoms or an alkoxyl group having 1 to 3 carbon atoms, or an unsubstituted aryl group; and each of R1 and R30 may share bond connectivity with an adjacent group to form a ring; the charge transport layer further comprises a compound having a substituted or unsubstituted alkylamino group in an amount of from 3 to 20 parts by weight based on 100 parts by weight of the distyryl compound; and wherein the following formulae (2-1) to (2-3) are satisfied: 0.2≦( D ( F 2)/ D ( G ))≦0.5 (2-1) 0.2 ≦D ( F 1) (2-2) D ( F 2)≦ D ( F 1) (2-3) wherein D(F1) (μm) and D(F2) (μm) represent average primary particle diameters of the largest and smallest inorganic pigments, respectively, and D(G) (μm) represents an average primary particle diameter of the titanyl phthalocyanine pigment.