Driving circuit for double solenoid focus actuator

Details Driving circuit for double solenoid focus actuator Driving circuit for double solenoid focus actuator

1989-08-01

1991-12-03

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4415, 369 32, 2502015, 359824, G11B 700

Patent

active

050704893

ABSTRACT:
A circuit for driving a focus actuator of the "double-solenoid" (i.e. twin-coil) variety comprises circuit means for selectively supplying current to one or the other of the actuator's coils in such a manner as to eliminate any dead-band discontinuity in the actuator response while current-switching between the coils. Such circuitry comprises a current source and/or amplifier for selectively providing current to the actuator coils, means for detecting the difference in current flowing in the coils, an a differential amplifier, connected in a feedback loop, for comparing the output of the detecting means with a signal indicating the focal position of a focusing lens. The output of the differential amplifier is used to control the output of the current source, controlling which of the two actuator coils receives current and how much.

REFERENCES:
patent: 4541084 (1985-09-01), Oku et al.
patent: 4561081 (1985-12-01), Janssen et al.
patent: 4660190 (1987-04-01), Fujii et al.
patent: 4733066 (1988-03-01), Konno et al.
patent: 4748610 (1988-05-01), Nakata et al.

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