Symmetrical astigmatic focus sensing system

Details Symmetrical astigmatic focus sensing system Symmetrical astigmatic focus sensing system

1975-12-31

1977-05-24

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

250201, H04N 576, G11B 712, G11B 1700

Patent

active

040259498

ABSTRACT:
An improved focus error correction system for use in an optical playback apparatus features a collimating lens which, in conjunction with a pair of cylinder lenses, form first and second astigmatic (line) images of the reading spot which are monitored by a photodetector to develop an error signal indicative of the sense and extent of defocusing of the reading spot.

REFERENCES:
patent: 3596101 (1971-07-01), Somea
patent: 3913076 (1974-02-01), Lehureau
patent: 3925603 (1975-12-01), Naruse et al.
patent: 3969576 (1976-07-01), Boonstra et al.
patent: 3971002 (1976-07-01), Bricot et al.
patent: 3983317 (1976-09-01), Glorioso

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