Synthetic resin lens system.

摘要

A unitary magnification lens system for an electrophotographic imaging system including a transparent planar platen and a folded optical system. The lens system is formed of four elements made of synthetic resin. It has an f/5.6 aperture for increased light gathering power to ease the requirements of the imaging system illumination system; a moderately wide field angle of 64° to image documents of up to 8 1/2 x 14 inches at a time, is non-vignetting and includes aspherical surfaces on its four elements, arranged in two pairs, that deviate to as much as the tenth order from the conic.