Information read apparatus with tracking control system

Details Information read apparatus with tracking control system Information read apparatus with tracking control system

1982-01-15

1984-12-11

Richardson, Robert L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

H04N 576, G11B 700, G11B 2100

Patent

active

044882769

ABSTRACT:
An information read apparatus with tracking control system comprises a first closed loop and a second closed loop. The first closed loop performs high speed tracking control and feedback compensation for damping the tracking control system, with the aid of a means for detecting the tracking error without excess frequency dependency. The second closed loop performs precise tracking control with the aid of tracking error detection by wobbling the reading position on the information carrier in a direction traverse to the information track being read. The second closed loop is dominant only in the low frequency region. Since the second closed loop is negligible in comparison with the first closed loop near the cross-over frequency of the tracking control system, phase lag of the second closed loop is allowable about said cross-over frequency. Therefore, the wobbling frequency can be selected so low that the same actuator that controls the global reading position can be used for wobbling. In this way, the tracking control system performs both of high precision control and high speed control.

REFERENCES:
patent: 3932700 (1976-01-01), Shopko
patent: 4118735 (1978-10-01), Wilkinson
patent: 4310911 (1982-01-01), Fujishima
patent: 4338682 (1982-07-01), Hosaka et al.

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