An optical information recording/reproducing apparatus includes a light source unit for emitting plural light beams for information recording and/or reproduction toward an optical information recording medium, an optical head on which the light source unit is mounted, and a frame of the apparatus on...http://www.google.com.tw/patents/US5648945?utm_source=gb-gplus-share專利 US5648945 - Optical information recording/reproducing apparatus
