Magnetic card reader

Details Magnetic card reader Magnetic card reader

1976-02-05

1977-11-15

Kilgore, Robert M.

Registers

Coded record sensors

Particular sensor structure

328147, 360113, 235485, 235493, G06K 708, G06G 714, G11B 512

Patent

active

040587053

ABSTRACT:
A reader for a magnetically coded card with a magnetodiode as the magnetic field sensor. A circuit for compensating for changes in magnetodiode resistance due to ambient temperature change. First and second amplifiers connected in a self balancing nulling system and having the magnetodiode signal as an input, and providing a null output signal for no magnetic field at the diode, with third and fourth amplifiers connected as comparitors and providing high and low output signals for magnetic fields of opposite polarity.

REFERENCES:
patent: 3668532 (1972-06-01), Potash
patent: 3731007 (1973-05-01), Masuda
patent: 3814863 (1974-06-01), O'Day
patent: 3851259 (1974-11-01), Porawski
patent: 3912943 (1975-10-01), Wilson
patent: 3969769 (1976-07-01), Gorter

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