A split type optical pick-up device suitable for use in an optical disc memory system has a two-part structure: stationary and movable optical systems which are provided separately. The stationary optical system includes a semiconductor laser for emitting a laser beam which is received by a deflecting...http://www.google.fr/patents/US4977552?utm_source=gb-gplus-shareBrevet US4977552 - Split type optical pick-up device with a tracking error detector on the moving part
Split type optical pick-up device with a tracking error detector on the ...
