Disc interface location

Details Disc interface location Disc interface location

1973-12-26

1976-02-03

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

250227, 250570, 360 71, 360 72, G11B 1722, G11B 5016, G11B 2504

Patent

active

039368785

ABSTRACT:
A disc storage file includes a multiplicity of closely spaced continuously rotating flexible or floppy discs associated with an accessing assembly for spreading the discs apart at randomly selected positions to accommodate a magnetic head. Apparatus for locating the disc interface (gap) to be accessed includes a pair of offset photocells which are light coupled to the disc gaps. The light applied to the photocells is guided in offset channels of a shroud and shaped congruent to the photocell surfaces by offset fiber optic shaping arrays. The offset arrays and associated electronics allow for accurate counting of gaps in the presence of fluctuating disc motion in the axial direction.

REFERENCES:
patent: 2994072 (1961-07-01), Woody, Jr.
patent: 3130393 (1964-04-01), Gutterman
patent: 3435314 (1969-03-01), Bradley et al.
patent: 3509553 (1970-04-01), Krijner
patent: 3539716 (1970-11-01), Stratton et al.
patent: 3573471 (1971-04-01), Kolb
patent: 3585396 (1971-06-01), Ferguson
patent: 3820884 (1974-06-01), Sone et al.

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