Optical head and magneto-optical read/write device

Details Optical head and magneto-optical read/write device Optical head and magneto-optical read/write device

1988-06-30

1990-06-12

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 13, 360114, G11B 1114

Patent

active

049339249

ABSTRACT:
An optical head for use in optical read/write system for reading or writing data from or to a magneto optical recording medium includes an objective lens. A light beam divider divides light reflected from the optical recording medium which passes through the objective lens into divided beams oriented in at least two directions. A cross-sectional form changer changes the cross-section of the divided beams as a function of the focus deviation of the objective lens. At least one analyzer is disposed in each of the divided light beam paths. Photoelectric transducers are disposed in each of the divided light beam paths so that the analyzer is disposed between each transducer and the light beam divider to provide signals in response thereto. A circuit receives the signals of the transducers and in response thereto focuses the objective lens.

REFERENCES:
patent: 4609813 (1986-09-01), Cohen
patent: 4783589 (1988-11-01), Ando

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