Copying apparatus with stationary original support table and novel imaging lens system

摘要

A copying apparatus comprising a flat stationary original support table, at least a movable mirror for scanning the surface of an original placed on said original support table, and an imaging optical system adapted for focusing the light beam from said movable mirror onto a photosensitive member and capable of compensating the change in the light path length from said original support table to the photosensitive member resulting from the displacement of said movable mirror while maintaining a constant image magnification.