Electrophotographic apparatus and electrophotographic method

摘要

An electrophotographic apparatus has a light scanning device for guiding a light beam onto a rotary polygon mirror and deflecting the light beam; and a recording medium which the light beam deflected by the light scanning device scans to form an image. The recording medium is an a-Si base photosensitive member. The electrophotographic apparatus satisfies a relation represented by Eq. (I) below; $where\; D\; is\; a\; diameter\; of\; the\; light\; beam\; at\; a\; reflecting\; surface\; of\; the\; rotary\; polygon\; mirror\; and\; W\; is\; a\; width\; in\; a\; main\; scanning\; direction\; of\; a\; deflecting\; surface\; of\; the\; rotary\; polygon\; mirror.\mathop{\mathrm{image}}$