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

1995-12-26

1997-11-11

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

359813, 359821, G11B 700

Patent

active

056871546

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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patent: 4998802 (1991-03-01), Kasuga et al.
patent: 5144617 (1992-09-01), Gotoh et al.
patent: 5216534 (1993-06-01), Boardman et al.
Patent Documents of Japan vol. 13, No. 102 (P-841) Mar. 10, 1989 & JP-A-63 281251 Nov. 17, 1988 Japan.
Patent Documents of Japan vol. 16, No. 546 (P-1452) Nov. 17, 1992 & JP-A-04 205821 Jul. 28, 1992 Japan.
Patent Documents of Japan vol. 16, No. 57 (P-1314) Feb. 19, 1992 & JP-A-03 260934 Nov. 20, 1991 Japan.
Nikkei Electronics, 1995.2.27 (No. 630), pp. 88-100.
Spie vol. 2338 Optical Data Storage (1994), pp. 282-288.

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