Magneto-optical signal read-out system using divided photodetect

Details Magneto-optical signal read-out system using divided photodetect Magneto-optical signal read-out system using divided photodetect

1986-11-05

1988-10-18

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 365122, G11B 712, G11B 1114, G11B 1304

Patent

active

047792507

ABSTRACT:
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.

REFERENCES:
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patent: 4569035 (1986-02-01), Tomita
patent: 4573149 (1986-02-01), Deguchi et al.
patent: 4631395 (1986-12-01), Ando
patent: 4638470 (1987-01-01), Connell et al.
Yoshio Aoki et al., A Magneto-Optic. Recording System Using TbFeCo, Sep. 19, 1985, pp. 1624-1628.
I. Sander et al., Digital Magneto-Optical Recorder, Jan. 17, 1983, proceedings SPIE, vol. 382, pp. 240-244.

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