Apparatus for recording and reading data from a magnetic plate

Details Apparatus for recording and reading data from a magnetic plate Apparatus for recording and reading data from a magnetic plate

1980-02-14

1982-04-20

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360 75, 360109, G11B 556

Patent

active

043262279

ABSTRACT:
An apparatus for recording and reading-out data from a circular, foil-like magnetic plate or floppy disc movablyarranged in an exchangeable cassette. The magnetic plate is coupled upon a drive shaft of a running mechanism which rotates the magnetic plate past a writing or recording-reading head. Adjustment can be made to particular information tracks of the magnetic plate. Linear motors are used for driving the shaft of the magnetic plate and for driving the shaft of a screw spindle upon which the writing or recording-reading head is arranged. A feeler pin secured to a writing- or recording-reader head carriage advances along a track spring of the screw spindle radially of the magnetic plate. Rotation of the linear motors can be controlled for the movement of the writing- or recording-reading head carriage by an electronic circuit with the aid of a measuring device, including a measuring wire arranged in an equilateral triangle and electromagnetically cooperating with a magnetic pin for generation of voltage impulses. The time interval between passage of the magnetic pin over the first and second legs of the measuring wire can be measured in a control electronic system and the resulting value is used as a basis for the desired control of the movements of the magnetic plate and/or the writing- or recording-reading head carriage.

REFERENCES:
patent: 4097908 (1978-06-01), Chou et al

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