Compact optical pickup head with tracking error signal generator

Details Compact optical pickup head with tracking error signal generator Compact optical pickup head with tracking error signal generator

1993-11-29

1994-09-13

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4416, 369 4422, G11B 700

Patent

active

053475003

ABSTRACT:
An optical pickup head apparatus comprises a yoke provided in an opposing relation to a magnet, a movable member having formed therethrough an aperture into which the yoke is inserted and around which a first coil is wound in an opposing relation to the magnet, an object lens supporting device having a pair of leaf springs for supporting the objective lens so that the objective lens can move in the direction parallel to the optical axis thereof and a plurality of second coils of substantially square shape for moving the objective lens in the direction parallel to the optical axis thereof and a tracking control device for rotating a mirror portion so that a beam spot focused on the optical disc by the objective lens follows a track on the optical disc, wherein the objective lens supporting device is secured to the movable member, the movable member is movably supported by the yoke and sides of the second coils which cross the optical axis of the objective lens and the first coil are located within a common magnetic gap.

REFERENCES:
patent: 4443721 (1984-04-01), Jansen
patent: 4504935 (1985-03-01), Jansen
patent: 4545046 (1985-10-01), Jansen et al.
patent: 4607913 (1986-08-01), Jansen
patent: 4688201 (1987-08-01), Towner et al.
patent: 4798447 (1989-01-01), Jansen et al.

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