Optical disc store scanning device with a plurality of scanning

Details Optical disc store scanning device with a plurality of scanning Optical disc store scanning device with a plurality of scanning

1986-08-27

1988-08-30

Beha, Jr., William N.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 33, 369 44, 369 45, G11B 708

Patent

active

047681799

ABSTRACT:
A positioning device for optical disk storage having a laser light source for creating a light beam, a scanning arrangement including an arrangement to focus the light beam onto a selected information track of the optical storage, a control unit, an arrangement for coarse positioning of the beam and an arrangement for fine positioning of the beam, which include a regulating loop in cooperation with a detector arrangement to produce track error signals and focus error signals characterized by the storage disk being divided into a plurality of concentric track zones with each zone comprising an plurality of information tracks, the scanning arrangement being sub-divided into a plurality of scanning units with one scanning unit for each of the concentric track zones and the units being arranged next to each other on a line which is preferably a segment of an arc, an arrangement for displacing each of the units relative to the line with the coarse positioning arrangement comprising a rotatable reflector mounted in the path of the light from a focussing arrangement and reflecting the light at one of the selected scanning units.

REFERENCES:
patent: 3737877 (1973-06-01), Feinleib
patent: 4094010 (1978-06-01), Pepperl et al.
patent: 4550249 (1985-10-01), Damen et al.
R. L. Garwin, "Optics for Beam Addressable Files", IBM Technical Disclosure Bulletin, vol. 15, No. 2, Jul. 1972, pp. 494-495.
Abstract of Japanese Patent 59-168942, Patents Abstracts of Japan, vol. 9, No. 24(P-331)(1747), Jan. 31, 1985.
Abstract of Japanese Patent 53-147507, Patents Abstracts of Japan, vol. 3, No. 18 (E-91), Feb. 16, 1979.

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