Two-dimensional scanning apparatus with constant speed scan

摘要

Two-dimensional scanning apparatus scans a stationary two-dimensional surface with a first deflector and a second deflector which deflects a light beam in a direction perpendicular to the deflecting direction of said first deflector. An afocal optical system is provided between said first and second deflectors, while an imaging lens system is provided between said second deflector and the scanning surface. Said first deflector, afocal optical system and imaging lens system cooperate to displace the light beam at a constant speed in a principal scanning direction on the scanning surface, while said second deflector and imaging lens system cooperate to displace the light beam at a constant speed in an auxiliary scanning direction on said surface.