Slip-off preventing tracking control apparatus

Details Slip-off preventing tracking control apparatus Slip-off preventing tracking control apparatus

1991-12-27

1993-04-13

Sniezek, Andrew L.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4432, 369 4428, G11B 700

Patent

active

052028640

ABSTRACT:
In an apparatus in which information is reproduced by projecting/receiving an optical beam to/from a recording carrier having a large number of information tracks, tracking control is performed so as to maintain a reproducing position on an information track by supplying a track deviation signal to an actuator. If this track deviation signal becomes asymmetric by an inclination, etc. of the recording carrier so that a shock is applied to the apparatus, jumping out of a track occurs, resulting in slip-off of the optical beam from the reproducing position. This slip-off can be prevented by detecting a position of a movable support member carrying a focusing lens for projecting and receiving the optical beam and feeding back the position signal to the tracking control system, or by extracting a low-frequency component of an output signal of a control circuit and feeding back the extracted signal to the tracking control system.

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patent: 5089999 (1992-02-01), Ishida et al.
patent: 5090001 (1992-02-01), Ito et al.

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