Magneto-optical disc reproducing apparatus with improved two-par

Details Magneto-optical disc reproducing apparatus with improved two-par Magneto-optical disc reproducing apparatus with improved two-par

1985-12-30

1988-11-15

Cardillo, Raymond F.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369110, 369 44, 360114, 365122, G11B 7095, G11B 1304, G11B 1100

Patent

active

047854383

ABSTRACT:
A reproducing apparatus for magneto-optical discs has a moving head portion and a fixed head portion. Light reflected from the disc is divided into two parallel light beam components having different planes of polarization. These light beam components are transmitted to corresponding light intensity detectors of the fixed head portion. The outputs of the detectors are unaffected by movement of the movable head portion relative to the fixed head portion radially of the disc and are unaffected by movement of the movable head portion in other directions due to inaccuracies in the slider mechanism that moves the movable head portion radially.

REFERENCES:
patent: 3842197 (1974-10-01), Broussaud et al.
patent: 4198657 (1980-04-01), Kanamaru
patent: 4410277 (1983-10-01), Yamamoto et al.
patent: 4472748 (1984-09-01), Kato et al.
patent: 4507763 (1985-03-01), Kato
patent: 4510544 (1985-04-01), Lazzari
patent: 4546460 (1985-10-01), Ando
patent: 4599714 (1986-07-01), Endo
Jenkins et al, "Fundamentals of Optics", Fourth Edition, published 1976, pp. 564-569.

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