Electrodynamic actuator for an optical write-in or read-out unit

Details Electrodynamic actuator for an optical write-in or read-out unit Electrodynamic actuator for an optical write-in or read-out unit

1991-01-29

1992-02-18

Arnold, Bruce Y.

Optical: systems and elements

Lens

With support

369 4415, 359824, G11B 708, G02B 702

Patent

active

050888056

ABSTRACT:
In an electrodynamic actuator for an optical write-in or read-out unit (11), which is aligned with respect to signal tracks of a storage medium in order to direct a focused light beam (13) onto a work position, the actuator includes an optical unit (11) is arranged on a movable permanent magnet arrangement (5, 5a) which can be moved by means of stationary coils (17a, 17b, 19a, 19b) located in its vicinity in focusing (z) and radial (x) directions running perpendicular to one another, the coils being located in the radial direction (x) on both sides of the permanent magnet arrangement (5, 5a), and the magnetization of the permanent magnet arrangement being chosen in such a way that its magnetic field in the region of coils (17c, 17d, 19c, 19d) opposite to it has both an x component and z component, the permanent magnet arrangement (5, 5a) with the optical unit (11) in the magnetic field of the coils is arranged at the free ends of spring rods (3) clamped at one end, and the spring rods (3) of the permanent magnet arrangement (5, 5a) provide flexible support and allow movement perpendicular to the focusing direciton or radial direction.

REFERENCES:
patent: 4332305 (1982-06-01), Kocolowski
patent: 4386823 (1983-06-01), Musha
patent: 4646283 (1987-02-01), Ito et al.
patent: 4669823 (1987-06-01), Iguma et al.
patent: 4813033 (1989-03-01), Baasch et al.

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