Method and apparatus for controlling the focusing and tracking o

Details Method and apparatus for controlling the focusing and tracking o Method and apparatus for controlling the focusing and tracking o

1981-08-14

1984-06-05

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 44, 369 46, 369112, 250201, 250204, G11B 712

Patent

active

044532393

ABSTRACT:
An apparatus and method for recording optically an information signal on a disk-like record medium as a spiral track or concentrical tracks by modulating a main beam by the information signal to be recorded and projecting the modulated main beam onto the record medium. In order to obtain a tracking error signal, a sub beam is also projected on the record medium at an edge of an adjacent track which has been previously recorded and the sub beam reflected by the record medium is detected by a light detector to produce the tracking error signal which is then supplied to a high pass filter to remove a low frequency component from the tracking error signal.

REFERENCES:
patent: 3925603 (1975-12-01), Naruse et al.
patent: 3974327 (1976-08-01), Van Dijk
patent: 4275275 (1981-06-01), Bricot et al.
patent: 4358200 (1982-11-01), Heemskerk et al.

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