Disc player servo device

Details Disc player servo device Disc player servo device

1989-03-21

1992-06-16

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4429, 369 4434, 369 4435, G11B 700

Patent

active

051230020

ABSTRACT:
A servo device for a disc player detects when the level of an error signal formed according to the output signal of the pickup is equal to or higher than a predetermined value, to provide a detection output. The device also detects when the frequency of the error signal is equal to or higher than a predetermined value, to provide another detection output. Then, it is determined from these detection outputs whether, during the closure of the servo loop, an oscillation occurs within the servo system by the servo convergence or by external interruption, so that the oscillation of the servo system can be positively detected and servo convergence resumed. The system may be implemented in either hardware or software.

REFERENCES:
patent: 4406000 (1983-09-01), Shoji et al.
patent: 4414655 (1983-11-01), Shoji et al.
patent: 4587644 (1986-11-01), Fujiie
patent: 4689779 (1987-08-01), Hayasei et al.
patent: 4907214 (1990-03-01), Nagano et al.

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