Optical scanning system for recording large image

An optical scanning system for reading and recording large images with 1 m width has been developed. The laser beam is deflected by an acousto-optical deflector (AOD) and the optical head on which the imaging lens is mounted is moved at high speed in a direction perpendicular to the optical scanning axis. A mechanical feed parallel to the optical scanning axis is added in order to scan the entire surface of the image; To maximize the scanning speed, the laser beam is separated into two beams and two data sets are read and recorded simultaneously. Variations in the optical length caused by the movement of the optical head must be considered in the design of the optics, A cylindrical lens and a ROM for maintaining a constant-frequency sweeping speed are necessary in order to compensate for the cylindrical effect of the AOD, Since the light intensity is too low for use of a CCD to be effective, it is necessary to use a photomultiplier as the scanner.