A modulator for modulating incident rays of light, the modulator having a plurality of equally spaced apart elements, each of which includes a light reflective planar surface. The elements are arranged parallel to each other with their light reflective surfaces parallel to each other. The modulator...http://www.google.com.hk/patents/US5808797?utm_source=gb-gplus-share專利 US5808797 - Method and apparatus for modulating a light beam
