OPTICAL INFORMATION REPRODUCER

摘要

PURPOSE:To reduce the movement of a light beam in photo detector position by inserting a cylindrical convex lens in the optical path directing reflected light beam to the photo detector. CONSTITUTION:The light beam from a light source 11 is magnified via photo deflector 114 which is making constant vibrations and is further radiated as a minute spot on an information disc 17 via photo deflector 14 and objective lens 15. The reflected light from the track on a disc 17 is separated with a beam splitter 13 and is received with a photo detector 19 through a cylindrical convex lens 18 which has the axis parallel to the rotaing axis of the photo deflector 114. The information signal and tracking control signal are obtained from the detector 19. Focusing of the lens 15 is accomplished by applying the focusing control signal to a driving coil 16.