Compact optical system for an electrostatic photographic copying apparatus

摘要

An electrostatic photographic copying apparatus includes an optical system for projecting an image of an original onto the surface of a photosensitive drum. The system consists of openings for exposure of the original and the photosensitive drum, first and second reflex mirrors, and a mirror lens. The mirror lens is disposed so that light from the original is reflected by the first reflex mirror into said mirror lens and from the mirror lens back to the first reflex mirror. The light from the original is then reflected by the first reflex mirror to the second reflex mirror and from the second reflex mirror onto the photosensitive drum to thereby form a four-fold reverse image of the original being copied.