LASER BEAM SCANNING UNIT AND PHOTOGRAPHIC PROCESSING DEVICE PROVIDED WITH LASER BEAM SCANNING UNIT

摘要

PROBLEM TO BE SOLVED: To change image quality by making the diameter of a laser beam change. SOLUTION: The laser beam scanning unit is provided with a laser beam generating part 100, a laser intensity modulation part 108 to modulate the intensity of a laser beam generated by the laser beam generating part, an optical system 150 to condense and to expose the laser beam passing the laser intensity modulation part, and focusing members 130, 131 interposed between the laser intensity modulation part and the optical system for changing the diameter of the laser intensity modulation part.