Electromagnetic actuator and optical disk apparatus incorporatin

Details Electromagnetic actuator and optical disk apparatus incorporatin Electromagnetic actuator and optical disk apparatus incorporatin

1993-04-30

1994-06-07

Sniezek, Andrew L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4415, 359814, 359824, G11B 708

Patent

active

053196244

ABSTRACT:
In an electro-magnetic actuator, a pair of magnetic circuits are separately arranged in a tracking direction and a carriage is located between the magnetic circuits and is movably supported or guide rails extending along the tracking direction. On the carriage, a lens holder for holding an objective lens is movably suspended and focusing coils are fixed on side surfaces of the lens holder. A tracking coil is fixed in the carriage and is extended in the magnetic circuit. Focusing permanent magnets of the magnetic circuits are so extended along the tracking direction as to produce, focusing magnetic fluxes penetrating the focusing coil and leakage magnetic fluxes penetrating the tracking coil. A focus drive force is generated by an interaction between a current supplied to the focusing coil and the focusing magnetic fluxes and a biasing track drive force is generated by an interaction between a current supplied to the tracking coil and the leakage magnetic fluxes.

REFERENCES:
patent: 4545046 (1985-10-01), Jansen et al.
patent: 4911534 (1990-03-01), Beyersbergen van Henegowen et al.

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