we present a creative principle model of high precision laser phototype setter. This model draws the virtue of present laser phototype setter
and overcomes their defect. So it makes this model more advenced and creative. This paper deals with many aspect knowledges of optics
precision mechanics and electronics. So we make a lot of research in the optical spot size of scanning optical system
the transmission error of mechanical chain and driving circuit of eletric motor.and find out a kind of principle model that meet future needs of color print of high speed