Servo-controlled actuator with two-peak flux density distributio

Details Servo-controlled actuator with two-peak flux density distributio Servo-controlled actuator with two-peak flux density distributio

1989-09-26

1991-12-17

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4414, 359814, 359824, G11B 700

Patent

active

050738828

ABSTRACT:
A lens actuator comprises a permanent magnet which generates a magnetic flux density distribution having two peaks of equal magnitudes, the two peaks being located symmetrically on opposite sides of a center axis of the distribution and arranged in a first direction perpendicular to the center axis. A pair of first coils and a second coil are mounted on a resiliently movable support. The first coils have first coil sections which cooperate with the magnetic flux to generate force components contributing to movement of the support in a second direction perpendicular to the first direction and second coil sections which cooperate with the magnetic flux to generate force components not contributing to the movement of the support in the second direction. The second coil sections of the first coils are located respectively at the peaks of the magnetic flux density distribution. The second coil cooperates with the magnetic flux to produce a force component that moves the support in the first direction. Because of the two peaks, flux densities do not substantially differ between upper and lower sections of the first coils when they are moved in a focusing direction.

REFERENCES:
patent: 4987565 (1991-01-01), Ikegame

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