Apparatus for driving objective lens

Details Apparatus for driving objective lens Apparatus for driving objective lens

1989-01-19

1991-01-22

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

049875655

ABSTRACT:
An apparatus for driving an objective lens in focusing and tracking directions for projecting a light beam upon an information track on an optical record medium, including a lens holder for holding the objective lens, resilient wires for supporting the lens holder movably in the focusing and tracking directions, a focusing coil wound on the lens holder, two pairs of tracking coils secured to opposite side walls of the lens holder, said opposite side walls being aligned in a track direction, permanent magnets each arranged to be faced to respective side walls, and a yoke having upright portions arranged to face respective magnets. In order to suppress an undesired rolling resonance, forces generated at first portions of tracking coils in the tracking direction are selectively increased or forces generated at second portions of tracking coils in the focusing direction are selectively decreased.

REFERENCES:
patent: 4092529 (1978-05-01), Aihara et al.
patent: 4679904 (1987-07-01), Kurihara
patent: 4767187 (1988-08-01), Gijzen et al.
patent: 4924199 (1990-05-01), Hashimoto et al.

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