Synthetic resin lens system for imaging apparatus

摘要

A unitary magnification lens system for an electrophotographic imaging system including a folded optical system is 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 and a moderately wide field angle of 64 DEG to image documents of up to 81/2x14 inches at a time. The lens system 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.