IMAGE FORMING DEVICE AND ELECTROPHOTOGRAPHIC PHOTORECEPTOR

摘要

An image forming device, which forms an electrostatic image on an electrophotographic photoreceptor by utilizing, as a means of expressing gradations, at least a pseudo-halftone process in which gradations are formed by dots, wherein: multiple recesses having depths of 0.5μm to 5μm and openings with a maximum diameter of 20μm to 80μm are formed on the surface of the electrophotographic photoreceptor; and when a square region having a side of 500μm on the surface of the electrophotographic photoreceptor is extracted, the area of the recesses in the square region is 10,000μm2 to 90,000μm2, the area of a flat section contained in the area outside of the recesses is 80,000μm2 to 240,000μm2, and the arrangement (A) of the multiple recesses is such that an image quality degradation index (f), which is calculated by a specific arithmetic process, is not more than 14%.