Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-08-09
1998-04-14
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 54, 369 4414, G11B 7095
Patent
active
057401390
ABSTRACT:
An optical actuator is disclosed which includes a base, a moveable lens holder including an objective lens and positioned relative to the base, and at least six planar magnetic coils and a plurality of magnetic assemblies arranged to be associated with the coils, each of the assemblies including magnets having two or more poles fixed to the actuator base, the coils and the magnets being mounted relative to each other on the lens holder and the base. The actuator includes circuitry for applying signals to the coils to induce magnetic fields in the coils for positioning the lens holder and detectors for providing signals representing the four degrees of freedom of positions of the lens holder with respect to the base. A computational circuitry responsive to the detectors determines the coil signals for positioning the moveable lens holder in six degrees of freedom of motion relative to the base.
REFERENCES:
patent: 4561081 (1985-12-01), Janssen et al.
patent: 4799766 (1989-01-01), Estes
patent: 5289442 (1994-02-01), Van Rosmalen
patent: 5412640 (1995-05-01), Fuldner et al.
Marino Philip F.
Simpson Charles J.
Eastman Kodak Company
Owens Raymond L.
Young W. R.
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