System for rotating an information storage disc at a variable an

Details System for rotating an information storage disc at a variable an System for rotating an information storage disc at a variable an

1985-05-08

1987-06-02

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358342, 369 50, 369111, H04N 5785

Patent

active

RE0324310

ABSTRACT:
Method and apparatus for recovering information at a substantially constant rate from a rotatable information storage disc. The information is stored on the disc in a plurality of substantially circular and concentrically arranged information tracks, with a substantially uniform recording density, and it is recovered by controllably rotating the disc, relative to a transducer, at an angular velocity substantially inversely proportional to the radius of the corresponding track. The apparatus includes a coarse speed control potentiometer for producing a measure of the radius of the particular information track from which information is being recovered, and fine speed control means for comparing the relative phase angles of a periodic signal in the recovered information and a periodic reference signal and for producing a fine speed control signal proportional to the phase difference. The measure of radius and the fine speed control signal are summed together and coupled to a voltage-controlled oscillator to produce a composite speed control signal, which is coupled to a servo to rotate the disc at a corresponding angular velocity.

REFERENCES:
patent: 2113226 (1938-04-01), Young
patent: 2901737 (1959-08-01), Stovall, Jr.
patent: 3646259 (1972-02-01), Schuller
patent: 3662353 (1972-05-01), Chertok
patent: 3753067 (1973-08-01), Milligan
patent: 3826965 (1974-07-01), Bringol
patent: 3925606 (1975-12-01), Wood et al.
patent: 3939302 (1976-02-01), Kihara
patent: 4123779 (1978-10-01), Goldschmidt
patent: 4236050 (1980-11-01), Winslow et al.

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