Optical disk reader with means for correcting errors due to ecce

Details Optical disk reader with means for correcting errors due to ecce Optical disk reader with means for correcting errors due to ecce

1976-07-06

1980-04-15

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 250202, 350 69, H04N 576, G11B 700, G11B 1700

Patent

active

041986571

ABSTRACT:
An optical reader for reading information recorded on a disk. The reader includes a mirror and a focussing lens. The mirror surface is alterable by feedback means to shift the point of incidence of a light beam passing through the lens onto the disk. The position of the surface is always selected to allow the light beam to pass through the image side focal point of the lens.

REFERENCES:
patent: 3771850 (1973-11-01), Casler
patent: 3882317 (1975-05-01), Camerik
patent: 3952148 (1976-04-01), Laub
patent: 4005260 (1977-01-01), Janssen
patent: 4044378 (1977-08-01), Laub

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