Voice coil motor

Details Voice coil motor Voice coil motor

1990-04-11

1991-09-24

Skudy, R.

Electricity: motive power systems

Reciprocating or oscillating motor

310 36, 310154, 310182, 360106, H02K 3300

Patent

active

050516698

ABSTRACT:
A voice coil motor includes an upper yoke having a lower surface, and a lower yoke having an upper surface. Two upper side yokes are attached to the lower surface of the upper yoke respectively at laterally opposite end positions on the lower surface of the upper yoke. Two lower side yokes are attached to the upper surface of the lower yoke respectively at laterally opposite end positions on the upper surface of the lower yoke. A central yoke has two distal end portions respectively sandwiched between the upper side yokes and the lower side yokes. An upper magnet is attached to the lower surface of the upper yoke and located above the central yoke. A lower magnet is attached to the upper surface of the lower yoke and located beneath the central yoke. A rotary arm is pivotally mounted on the upper yoke. The rotary arm has a coil wound around the central yoke with a spacing being maintained therebetween so that the rotary arm is allowed to pivot along the central yoke. The voice coil motor is characterized in that the motor includes at least one shorted turn fitted around one of the side yokes.

REFERENCES:
patent: 4490635 (1984-12-01), Harrison et al.
patent: 4573094 (1986-02-01), Gibeau et al.
patent: 4864447 (1989-09-01), Takekado et al.
patent: 4916342 (1990-04-01), Hirano et al.
patent: 4945435 (1990-07-01), Boigenzahn et al.
IEEE Transactions on Magnetics; vol. Mag-18; No. 3; 5/82; K. S. Ananthanarayanan; pp. 3-7.
IEEE Transactions on Magnetics; vol. Mag-19; No. 5; 5/83; J. A. Wagner; pp. 2-4.

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