Registers – Coded record sensors – Particular sensor structure
Patent
1977-02-25
1979-02-27
Cook, Daryl W.
Registers
Coded record sensors
Particular sensor structure
235493, 307351, 328146, 329109, 360 40, 360 88, G06K 708, G06K 1906, G11B 509, G11B 1702
Patent
active
041414942
ABSTRACT:
A system for reading binary digital data, represented by two possible spacings between abrupt flux reversals appearing on a magnetic track of a credit card, as the credit card is transported by hand by and in engagement with a magnetic head of the system. A read head having an unusually large read aperture is used to translate the two possible encoded lengths into two possible waveform amplitudes which are independent of transport speed. Then, by means of amplitude discrimination, the "0" bits are detected; and by zero slope detection, the "1" bits are detected. Mechanically, the read head is located centrally in an obtusely angled long side of a housing and is opposed by a contoured Teflon pillow that substitutes for one-half of the usual card slot. This unidirectional pillow is shaped and spaced from the head so as to cause the credit card to be slightly bent around the head's face in passing.
REFERENCES:
patent: 3577192 (1971-05-01), Schaepfer
patent: 3588379 (1971-06-01), Young et al.
patent: 3631429 (1971-12-01), King
patent: 3706860 (1972-12-01), Burbank
patent: 3749889 (1973-07-01), Vaskunas
patent: 3859510 (1975-01-01), Fiehmann et al.
Cook Daryl W.
Phillips C. A.
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