An optical head having a vertical flat plate shaped magnetic cir

Details An optical head having a vertical flat plate shaped magnetic cir An optical head having a vertical flat plate shaped magnetic cir

1994-11-15

1996-09-10

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4414, 359813, G11B 709

Patent

active

055552285

ABSTRACT:
An optical pickup device employing an objective lens driving device for displacing an objective lens relative to an optical disc surface in directions parallel and normal to the optical axis of the objective lens. The objective lens is mounted in a movable part consisting of a bobbin having an opening at its mid portion. A plurality of resilient supporting members movably support the movable part. A magnetic circuit unit includes a flat-plate-shaped member carrying a focusing coil and a tracking coil. The flat-plate-shaped member extends parallel to the optical axis of the objective lens. The focusing and tracking coils drive the movable part in a direction parallel to, and in the planar direction normal to, the optical axis of the objective lens. An objective lens driving device is mounted for translating movement on a base member on which are mounted a light source, a light receiving element (for receiving return light), a reflective mirror, and a beam splitter.

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