Opto-magnetic signal reproducing apparatus for reading, by differential detection using a magneto-optical effect, information magnetically recorded on a record medium

摘要

There is disclosed an opto-magnetic signal reproducing apparatus comprising a light source unit (1 to 4) for applying a linearly polarized light beam to a record medium (5) having magnetically recorded information, a splitter (3, 6, 7, 9) for splitting the light beam modulated responding to the recorded information by a magneto-optic effect, into two light beams having different polarization directions from each other, and a reproduce device (8, 10) for differentially detecting the split light beams to reproduce the recorded information and wherein the splitter imparts a phase difference equal to an integer multiple of π to each of the split light beams.