Digital code reader

Details Digital code reader Digital code reader

1979-02-22

1981-03-03

Cook, Daryl W.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

235449, 235482, 360 2, H04N 954, G06K 708, G06K 1300, G11B 2504

Patent

active

042544416

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: 3422411 (1969-01-01), Smith, Jr.
patent: 3626158 (1971-12-01), Lawrence

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