Apparatus for reproducing information from magnetooptical record

Details Apparatus for reproducing information from magnetooptical record Apparatus for reproducing information from magnetooptical record

1985-04-05

1987-09-01

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 46, 369110, G11B 1110

Patent

active

046913084

ABSTRACT:
In an apparatus for irradiating a magnetooptical recording medium with a linearly polarized light beam and detecting the light from the medium, the light from the magnetooptical recording medium is divided, depending on the degree of the plane of polarization, into two light beams of different intensities which are respectively converted into electrical signals for supply to a differential amplifier, wherein an electrical signal corresponding to a light beam is amplified in order to eliminate the noise component in the output signal of the differential amplifier. In addition, the apparatus is so constructed that the amplification of the electrical signal corresponding to a divided light beam is controlled in response to the electrical signals corresponding to the divided light beams.

REFERENCES:
patent: 4558440 (1985-12-01), Tomita
patent: 4561032 (1985-12-01), Matsumoto et al.
patent: 4569035 (1986-02-01), Tomita
patent: 4573149 (1986-02-01), Degrichi et al.

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