Focus/tracking actuator with moving-magnet motors

Details Focus/tracking actuator with moving-magnet motors Focus/tracking actuator with moving-magnet motors

1995-03-27

1996-10-01

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4415, 359813, G11B 7095

Patent

active

055616461

ABSTRACT:
A focus/tracking actuator for an optical or magnetooptical disk drive includes a pair of moving-magnet type linear motors for simultaneously controlling the focus and tracking positions of an objective lens used to focus a write/read beam on a desired data track of a rotating data storage disk. Each motor includes a pair of selectively energizable focus and tracking coils, one coil being positioned within the other so that its respective windings are perpendicular to those of the other coil. Flux lines emanating from a permanent magnet secured to a movably mounted lens housing interact with the electromagnetic fields surrounding both coils, and a single steel plate or the like, positioned inside the windings of both coils, facilitates the return of magnetic flux to the magnet while preventing such flux from cutting portions of the coils which would act to exert an undesired forces on the lens housing. Preferably, the steel plate is composed of two segments to facilitate winding of the coils about the plate.

REFERENCES:
patent: 4759005 (1988-07-01), Kasahara
patent: 5136558 (1992-08-01), Getreuer et al.
patent: 5241528 (1993-08-01), Mohri et al.
patent: 5319497 (1994-06-01), Wakabayashi et al.
patent: 5373496 (1994-12-01), Tomita et al.

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