Optical pickup device which can be adapted to plurality of types

Details Optical pickup device which can be adapted to plurality of types Optical pickup device which can be adapted to plurality of types

1997-09-23

1999-02-09

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4414, 369 94, 359813, 359821, G11B 700

Patent

active

058703713

ABSTRACT:
An optical pickup device includes two objective lenses having numerical apertures different from each other, a lens holder for holding these objective lenses in common, a cylinder fixed to the lens holder, and four tracking coil pairs affixed onto a cylindrical surface of the cylinder. Two tracking coil pairs are displaced from the remaining two tracking coil pairs by a predetermined angle. When one objective lens is used, two tracking coil pairs corresponding to the objective lens are used for tracking control of the objective lens. The remaining two tracking coil pairs are used for positioning control of the objective lens.

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