Registers – Coded record sensors – Particular sensor structure
Patent
1976-11-08
1978-08-22
Cook, Daryl W.
Registers
Coded record sensors
Particular sensor structure
235488, 365 52, G06K 708, G06K 1906, G11C 502
Patent
active
041083660
ABSTRACT:
A card reader adapted to receive a coded card is provided which includes an alternating current source and sensing means connected to the alternating current source. The sensing means includes a plurality of tuned circuits, each having a sensing coil. Each coil has a pressed powder ferromagnetic core and an annular pressed powder ferromagnetic sleeve encircling the coil in a plane parallel to the longitudinal axis of the core. The coded card consists of a thin electrically conductive layer having holes selectively formed in the layer in data positions, which, when taken together with portions of the remainder of the electrically conductive layer, constitute binary coded information. The card reader contains a protrusion which prohibits access to a portion of the card reader. A notch is formed in one side of the card to receive the card reader protrusion so that the card may be fully inserted into the card reader in only one position, thereby aligning the coils and the data positions. The card reader positions the electrically conductive layer of a correctly inserted card adjacent the air gap between the core and the sleeve of the coils.
REFERENCES:
patent: 3627993 (1971-12-01), Cooper, Jr.
patent: 3699311 (1972-10-01), Dunbar
patent: 3869082 (1975-03-01), Ludin
patent: 3919528 (1975-11-01), Cooper et al.
Feagin Frederick E.
Genest Leonard J.
Cook Daryl W.
Monitron Industries, Inc.
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