Tracking circuit for an optical information recording and reprod

Details Tracking circuit for an optical information recording and reprod Tracking circuit for an optical information recording and reprod

1986-10-29

1989-07-18

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

G11B 7126

Patent

active

048499536

ABSTRACT:
An optical information recording and reproducing apparatus comprising: a circuit for focusing a light beam on a recording track of an optical disk having tracks formed spirally or concentrically; a circuit for recording the information on a track corresponding to the focused position of light beam on the track or reproducing information from on the track; a tracking control circuit for generating a tracking control signal for matching the focused position of the light beam with the track; a circuit for detecting deviation of the focused position of the light beam from the track and generating a deviation signal corresponding to the focused position of the light beam; a holding circuit for holding the deviation signal; a subtracting circuit for subtracting the held deviation signal from the tracking control signal; and a circuit for moving an objective lens for controlling the focused position of the light beam in response the output signal from the subtracting circuit.

REFERENCES:
patent: 4502134 (1985-02-01), Kondo et al.
patent: 4504937 (1985-03-01), Yonezawa et al.
patent: 4564929 (1986-01-01), Yonezawa et al.
patent: 4587644 (1986-05-01), Fujiie
patent: 4589103 (1986-05-01), Tajima
patent: 4663751 (1987-05-01), Kaku et al.

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