Objective lens driving apparatus and method including visco-elas

Details Objective lens driving apparatus and method including visco-elas Objective lens driving apparatus and method including visco-elas

1996-06-27

1998-02-17

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4415, 369 4416, 359823, G11B 7085

Patent

active

057198349

ABSTRACT:
An objective lens driving apparatus includes a base, an objective lens for converging an optical beam on an optical disc while the optical disc is rotating, and a holding member for holding the objective lens. A first supporting mechanism elastically supports the holding member on the base in such a manner as to allow the holding member to be translated in a focusing direction which is substantially perpendicular to a surface of the optical disc and in a tracking direction which is substantially perpendicular to the focusing direction and parallel to a radial direction of the optical disc. A moving mechanism including a coil and a magnetic circuit for translates the holding member in the focusing direction and the tracking direction by a driving force generated by the coil and the magnetic circuit. A second supporting mechanism for visco-elastically supports the magnetic circuit on the base in such a manner as to translate the magnetic circuit in the focusing direction. The magnetic circuit is translated in an opposite direction to the translation direction of the holding member by a driving force acting oppositely to the driving force for translating the holding member in the focusing direction.

REFERENCES:
patent: 4615585 (1986-10-01), Van Sluys et al.
patent: 5070489 (1991-12-01), Perry et al.
patent: 5164936 (1992-11-01), Kagami
patent: 5228017 (1993-07-01), Matsuzaki et al.
patent: 5463612 (1995-10-01), Date

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