Optical playback system having increased depth-of-field

Details Optical playback system having increased depth-of-field Optical playback system having increased depth-of-field

1978-02-27

1979-12-18

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358127, 365120, G11B 700

Patent

active

041797086

ABSTRACT:
Recovery from a record of information recorded in an elongated information track comprising depressed areas alternating along the length of the track with relatively non-depressed areas, is effected by an optical playback system. The playback system employs means for illuminating a focusing lens with a light beam having a cross-section forming a closed band of light, such as an annulus, to thereby increase the depth-of-field of the resulting focused spot formed on the information track. Light detection means, responsive to light diffracted by the track provides an output signal representative of the recorded data.

REFERENCES:
patent: 3547526 (1970-12-01), Devereux
patent: 3705758 (1972-12-01), Haskal
patent: 3919562 (1975-11-01), Whitman
The Axicon: A new type of optical element, by John H. McLeod, vol. 44, p. 592, Aug. 1954.

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