Focus actuator driving apparatus

Details Focus actuator driving apparatus Focus actuator driving apparatus

1989-11-22

1992-08-04

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4435, G11B 700

Patent

active

051365669

ABSTRACT:
A driving circuit drives an actuator in accordance with either a driving signal or a focus error signal that is selected by a switching circuit. A capacitor, which is inserted in a feedback loop of the driving circuit, holds a driving voltage inputted to the driving circuit immediately before the switching of the switching circuit and applies the held voltage to the driving circuit at the time of the switching of the switching circuit.

REFERENCES:
patent: 3896304 (1975-07-01), Aoki et al.
patent: 4488275 (1984-12-01), Ceshkovsky et al.
patent: 4630121 (1986-12-01), Suzuki et al.
patent: 4689779 (1987-08-01), Hayashi et al.
patent: 4733066 (1988-03-01), Konno et al.
patent: 4740679 (1988-04-01), Doi

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