Patent ID: 6061080
Filing Date: 2000-05-09
Classification: G02B

Abstract:
A raster output scanner optical system for a printing apparatus, the optical system comprising:a light emitting device for emitting multiple light beams, said multiple beams being telecentric with the optical axis of said raster output scanner optical system;a photoreceptor;a rotating polygon mirror with multiple reflective facets for scanning each of said multiple light beams along the photoreceptor;an input optical system including collimating means for collimating and focusing each of said multiple beams onto one of said multiple reflective facets of said rotating polygon mirror;a multiple reflection optical system for reflecting each of said multiple light beams from said one of said multiple reflective facets back to said one of said multiple reflective facets for scanning each of said multiple light beams along the photoreceptor;an output optical system comprising an F-theta optical element and a motion compensation optical element for focusing each of said multiple light beams from said one of said multiple reflective facets along the photoreceptor; andan aperture and lens between said collimating means and said rotating polygon mirror positioned where said multiple beams cross said optical axis for eliminating differential scan line bow of said multiple beams at said photoreceptor.