Dual beam optical data system

Details Dual beam optical data system Dual beam optical data system

1986-09-15

1988-03-08

Pitts, Harold I.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

235462, 235487, 235454, G11B 700

Patent

active

047302933

ABSTRACT:
An optical data reading and writing system in which a laser beam records data spots on a medium and a wide light beam is used for simultaneously reading the data spots and prerecorded information. The laser beam records spots of a uniform size which is less than about ten micrometers. The wide beam which may be emitted by an LED illuminates a substantially larger area of the medium than the laser beam. Prerecorded information, if present, may include parallel track lines, the wide beam illuminating adjacent pairs of track lines in addition to the data spots and prerecorded clock spots in data tracks between the track lines. Multiple data paths may be present between track lines, which may then be read simultaneously by a photodetector. The photodetector may have a plurality of detector elements which have apertures such that simultaneously illuminated data spots are distinguished.

REFERENCES:
patent: 4290122 (1981-09-01), Bates et al.
patent: 4360728 (1982-11-01), Drexler
patent: 4425636 (1984-01-01), Musha
patent: 4500777 (1985-02-01), Drexler
patent: 4542288 (1985-09-01), Drexler
patent: 4544835 (1985-10-01), Drexler

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