A laser beam scanning apparatus employs a movable reflector (32) having a large number of flat reflective sides (44) a deflector (16) which shifts the laser beam (10) at high speed across a plurality of the reflective sides (44). The movement of reflector (32) is synchronized with the deflection of the...http://www.google.com.tw/patents/US5646766?utm_source=gb-gplus-share專利 US5646766 - Laser beam scanning apparatus and method
