Apparatus for positional control of a reading head in a device f

Details Apparatus for positional control of a reading head in a device f Apparatus for positional control of a reading head in a device f

1974-08-29

1977-07-05

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358130, 1791003V, 1791003G, 250201, 250237G, G11B 712, G11B 716, G11B 724

Patent

active

040344037

ABSTRACT:
An apparatus is described for reading, by means of a beam of radiation, a disk-shaped information carrier which contains spirally arranged video and/or audio signals coded in optical form, which apparatus comprises a source of radiation and a radiation-sensitive signal detector cell, the information carrier being disposed in the radiation path between this source and this detector. By providing at least one grating, consisting of radiation-transmitting and radiation-absorbing stripes and on which an image of part of the grating-shaped structure of the information track in the vicinity of the portion of this track to be read may be formed, and a radiation-sensitive detection system, an accurate indication of axial and radial displacements of the optical imaging system relative to the information carrier can be obtained.

REFERENCES:
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patent: 3153111 (1964-10-01), Barber et al.
patent: 3281151 (1966-10-01), Kaprelian et al.
patent: 3391255 (1968-07-01), Gregg
patent: 3578980 (1971-05-01), Decker, Jr.
patent: 3612695 (1971-10-01), Bouwhuis
patent: 3631253 (1971-12-01), Aldrich et al.
patent: 3715524 (1973-02-01), Adler
patent: 3786184 (1974-01-01), Pieters
patent: 3833769 (1974-09-01), Compaan et al.

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