Apparatus for optically reproducing an information signal record

Details Apparatus for optically reproducing an information signal record Apparatus for optically reproducing an information signal record

1983-01-24

1985-04-16

Richardson, Robert L.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 46, G11B 700

Patent

active

045120048

ABSTRACT:
An optical reproducing apparatus includes an optical pickup device which projects a laser beam onto a record disc having an information signal recorded in a plurality of record tracks thereon and which reproduces the information signal from the modulated laser beam reflected from the record disc, the optical pickup device including an objective lens movable in directions toward and away from the record disc to focus the projected laser beam onto the record disc; a focus servo control arrangement which moves the objective lens in the directions toward and away from the record disc in response to a focusing error signal which, in turn, is produced in response to the modulated laser beam, so as to focus the projected laser beam onto the record disc; a laser beam tracking device which rapidly moves the laser beam projected onto the record disc, during a search mode of operation, in a direction transverse to the record tracks to a desired position with respect to the record disc; a track jump signal generating circuit which produces a track jump signal in response to a track jump command signal to control the laser beam tracking device to rapidly move the projected laser beam to the desired position; and a current divider circuit which reduces the level of the focusing error signal, at least during the duration of the track jump signal, in response to the track jump command signal.

REFERENCES:
patent: 4163149 (1979-07-01), Sawano et al.
patent: 4243848 (1981-01-01), Utsumi

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