Patent ID: 8778579

Claim:
A laminate type electrophotographic photoreceptor comprising: an electrically conductive substrate; and an undercoat layer (UL), a charge generation layer (CGL), and a charge transport layer (CTL) sequentially disposed on the electrically conductive substrate, wherein a characteristic response time of the photoreceptor is about 10 msec or more and about 85 msec or less and a thickness of the charge transport layer is equal to or greater than about 21 μm and equal to or less than about 45 μm: wherein the characteristic response time is denoted as a shortest response time in a range of response times generating characteristic photoinduced discharge curves (PIDC), the response time is denoted as a time elapsed from the moment of light exposure of the laminate type electrophotographic photoreceptor to the moment of development thereof, and the characteristic PIDC is denoted, in a photoinduced discharge characteristic test in which the laminate type electrophotographic photoreceptor is charged to have an initial surface potential range of about −500 V to about −700 V by using a direct current (DC) contact charging method in an environment of a temperature of 23° C. and a relative humidity of 50% and, thereafter, the laminate type electrophotographic photoreceptor is exposed to monochromatic light having a wavelength of about 780 nm, as a PIDC exhibiting a saturation phenomenon in which the surface potential of the laminate type electrophotographic photoreceptor after the light exposure is in a range of about 0 V to about −200 V and the surface potential of the laminate type electrophotographic photoreceptor after the light exposure does not change about ±10 V or more even when exposure energy increases 10 times.