Data storage and retrieval system employing balanced magnetic ci

Details Data storage and retrieval system employing balanced magnetic ci Data storage and retrieval system employing balanced magnetic ci

1977-09-08

1978-12-19

Kilgore, Robert M.

Registers

Coded record sensors

Particular sensor structure

360121, 360123, G06K 708, G11B 527, G11B 520

Patent

active

041302427

ABSTRACT:
A data storage retrieval system includes a magnetic circuit read head which comprises first and second pole members. Located and positioned between the poles is a pickup means which comprises a magnetic member having a pickup coil associated therewith. The member as positioned between the poles is located at a point which provides zero output across the coil when the poles are excited by a source of alternating potential. A magnetic material which may be positioned on an information carrying card is positioned such that it affects the flux lines between one of the poles and said pickup means. This position of the magnetic member serves to provide a signal across the coil indicative of a binary one or a zero.

REFERENCES:
patent: 3290487 (1966-12-01), Scott
patent: 3312372 (1967-04-01), Cooper
patent: 3654435 (1972-04-01), Vaccaro
patent: 3780271 (1973-12-01), Sharkitt
patent: 3896292 (1975-07-01), May
patent: 3985998 (1976-10-01), Crafton

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