Electrophotographic photoreceptor having excellent lifetime characteristics and charge uniformity, and electrophotographic image forming apparatus and electrophotographic cartridge using the electrophotographic photo receptor

摘要

Provided is a laminate type electrophotographic photoreceptor including an electrically conductive substrate, and an undercoat layer, a charge generation layer, and a charge transport layer sequentially disposed on the electrically conductive substrate, in which 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 greater than about 18 μm and equal to or less than about 45 μm. Also, an electrophotographic image forming apparatus and an electrophotographic cartridge using the electrophotographic photoreceptor are provided. An electrophotographic photoreceptor according to the present general inventive concept has an improved response time and thus, charge stain characteristics are excellent even when a thick charge transport layer is selected. Therefore, the electrophotographic photoreceptor of the present general inventive concept may have both excellent lifetime characteristics and excellent charge stain characteristics.

主权项

1. 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.