MAGNETO-OPTICAL HEAD WITH SEPARATE OPTICAL PATHS FOR ERROR AND DATA DETECTION

摘要

An improved magneto-optical head using a laser pen (44) with a focus error and tracking error detector (48) in substantially the same optical path as the originating laser beam. In this invention the stored information is derived from the beam reflected by a beam-splitter (54), while the transmitted light is utilized for generating the tracking error and the focus error signals.