Focus servo circuit for a magneto-optical disk recording and rep

Details Focus servo circuit for a magneto-optical disk recording and rep Focus servo circuit for a magneto-optical disk recording and rep

1991-07-29

1993-11-16

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

052630099

ABSTRACT:
An apparatus for optically recording/reproducing data to/from a disc including a focus servo circuit which initially sets an objective lens of an optical head to a predetermined setting. This predetermined setting is such that a laser beam passing through the lens is focused on the disc at a point inside of the disc in the thickness direction. Then, the focus servo circuit fine tunes the objective lens position until the laser beam is focused onto a recording film located inside of the disc.

REFERENCES:
patent: 4337532 (1982-06-01), Oprandi et al.
patent: 4439848 (1984-03-01), Ceshkovsky et al.
patent: 4544837 (1985-10-01), Tanaka et al.
patent: 4998233 (1991-03-01), DiMatteo et al.
patent: 5060215 (1991-10-01), Kawamura et al.
patent: 5103439 (1992-04-01), Bierhoff et al.
patent: 5113384 (1992-05-01), McDonald et al.

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