Tracking control apparatus for controlling the tracking of a tar

Details Tracking control apparatus for controlling the tracking of a tar Tracking control apparatus for controlling the tracking of a tar

1990-11-16

1993-01-12

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4425, 369 4429, G11B 700, G11B 709

Patent

active

051795450

ABSTRACT:
A tracking control apparatus is provided for controlling a displacement error between a pickup system and a track when reproducing information recording on an information-recording and reproducing medium having tracks on which information is recorded or reproduced. The tracking control apparatus includes on-track detecting means for detecting a light beam is located on the track, traveling-direction detecting means for detecting the direction of the pickup system traveling toward the track from the displacement error and the output signal supplied by the on-track detecting means and outputting a traveling-direction signal representing the traveling direction, track-slippage detecting means for detecting a track-slippage signal representing the direction of the light beam being slipped out of a target track from the traveling-direction signal supplied by the traveling-direction detecting means, and tracking control means for supplying as a control signal the displacement error when the light beam is located on the target track or as a control signal the track-slippage signal supplied by the track-slippage detecting means when the light beam is not spotted on the target track and driving the pickup system in a manner to allowing the light beam to follow the tracks.

REFERENCES:
patent: 4338682 (1982-07-01), Hosaka et al.
patent: 4484319 (1984-11-01), Hoishi et al.
patent: 4544872 (1985-10-01), Hirano et al.
patent: 4669072 (1987-05-01), Miura et al.
patent: 4677602 (1987-06-01), Okano et al.
patent: 4751695 (1988-06-01), Kaku et al.
patent: 4899325 (1990-02-01), Katsuhara et al.

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