Dual layered magnetic data card with reading and recording appar

Details Dual layered magnetic data card with reading and recording appar Dual layered magnetic data card with reading and recording appar

1988-05-13

1991-03-26

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Thermomagnetic recording or transducers

360 2, G11B 502, G11B 2504

Patent

active

050034090

ABSTRACT:
A dual layered magnetic card with an apparatus for reading data therefrom and recording data thereon. The magnetic card includes (a) a card body, (b) a first magnetic layer disposed on the card body, the first magnetic layer including a first magnetic material, (c) a second magnetic layer disposed on the first magnetic layer, the second magnetic layer including a second magnetic material having Curie temperature lower than that of the first magnetic material and a coercive force at an ambient temperature higher than that of the first magnetic material. Also disclosed is an apparatus for reading data on the magnetic card, having a reader, post processor and data eraser, and an apparatus for reading and recording data having a recorder, reader, post processor and a data eraser.

REFERENCES:
patent: 4090662 (1978-05-01), Fayling
patent: 4194110 (1980-03-01), Lazzari et al.
patent: 4423453 (1983-12-01), Kawahara et al.
patent: 4520409 (1985-05-01), Kimoto et al.
patent: 4612587 (1986-09-01), Kaneko et al.
patent: 4771347 (1988-09-01), Horimai et al.
patent: 4799114 (1989-01-01), Tsunashima
Tsunashima et al., IEEE Transactions on Magnetics, vol. MAG-17, No. 6, Nov. 1981, "Thermomagnetic Writing on Exchange-Coupled Amorphous Rare-Earth Iron Double-Layer Films", pg. 2840.
May, G. H., IBM TDB, vol. 16, No. 7, Dec. 1973, "Beam Addressable High-Density Magnetic Record File", pg. 2365.

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