Optical disc reader having diffraction minima at non-interrogate

Details Optical disc reader having diffraction minima at non-interrogate Optical disc reader having diffraction minima at non-interrogate

1977-07-19

1979-10-23

Stern, Ronald J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003G, 358128, G02B 2738, G11B 718

Patent

active

041718798

ABSTRACT:
The invention relates to a method and a device for the optical reading of information recorded on a support along a track in the form of diffracting elements. A diffraction pattern comprising a luminous central spot centered on the section of the track to be read and alternately dark and bright adjacent fringes is projected onto the support, the dark fringes adjacent to the central spot coinciding with the track sections in the neighborhood of the track section to be read. To that effect a pupil limited by two edges which are parallel to the direction of travel of the track is utilized, this pupil being placed against the reading objective.

REFERENCES:
patent: 3971002 (1976-07-01), Bricot et al.
patent: 3983317 (1976-09-01), Glorioso
patent: 4065786 (1977-12-01), Stewart

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