Magneto-optical signal read-out system using divided photodetector

摘要

A magneto-optical signal read-out system for a magneto-optical player in which the polarized plane of linearly polarized incident light is rotated when the incident light is reflected by or passes through a magneto-optical medium having tracks thereon and the rotation angle of the polarized plane is utilized as an information signal. The read-out system includes a first analyzer, a second analyzer and a photo detector divided into first and second photo detector sections. A differential amplifier receives output signals from the first and second photo detector sections and produces a detected signal representative of the difference between the first and second output signals to reduce in-phase noise in the detected signal.