Laser printing scanning system - has fast spot width control and uses modulated semiconductor light-guide array

摘要

A semiconductor laser (1) is coupled to an electrooptical crystal with parallel channels (13). Their throughput is controlled by their electrode-voltages to focus on to a rotating eight-sided mirror horizontally scanning a synchronised rotating drum (2,6,8,9) in a half-tone printing process. The image width and intensity profile can be modulated at high frequency via the electrodes to produce effectively smoother gradation than by the abscence or presence of dots. USE/ADVANTAGE - For video disc recording equipment or for laser printer. Improved control of printing quality.