Optical pickup device with movable objective lens and stationary

Details Optical pickup device with movable objective lens and stationary Optical pickup device with movable objective lens and stationary

1995-03-31

1996-07-30

Hindi, Nabil Z.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4421, G11B 700

Patent

active

055418996

ABSTRACT:
An objective lens drive device has a supporting member to which an objective lens is attached. The supporting member is freely translated in a direction parallel to the optical axis of the objective lens and in a plane perpendicular to the optical axis. The supporting member is attached a stationary portion, and a magnetic circuit provided on the supporting member forms a closed magnetic path. A focusing coil and a plurality of tracking coils attached to the focusing coil drive the objective lens in cooperation with the magnetic circuit so that the objective lens is translated in the direction parallel to the optical axis and in the direction perpendicular to the optical axis. The focusing coil and the tracking coils are mounted on the stationary portion so as to oppose the magnetic circuit with a predetermined spacing therebetween.

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