Write head apparatus for recognizing magnetic characters and met

Details Write head apparatus for recognizing magnetic characters and met Write head apparatus for recognizing magnetic characters and met

1987-10-19

1990-05-01

Trafton, David L.

Registers

Coded record sensors

Particular sensor structure

360119, 382 7, G06K 708

Patent

active

049220861

ABSTRACT:
A system for recognizing characters printed in magnetic ink on a document has a write head including a permanent magnet and soft iron pole pieces curving arcuately from opposite poles of the magnet to juxtaposed ends forming a gap underlying a curved, nonmagnetic cap along which a document is moved. The pole pieces are unequally magnetized to provide a component of magnetic induction normal to the upper surface of the cap that has opposite signs on opposite sides of the gap and differing peak values, the peak value to one side of the gap being in the range from 450 gauss to 650 gauss and the peak value on the other side of the gap being in the range from 200 gauss to 340 gauss.

REFERENCES:
patent: 2985298 (1961-05-01), Schreiner
patent: 3152225 (1964-10-01), Peters
patent: 3638238 (1972-01-01), Milford et al.
patent: 3978450 (1976-08-01), Sanner et al.
patent: 4239151 (1980-12-01), Enser et al.
patent: 4245211 (1981-01-01), Kao
patent: 4805058 (1989-02-01), Takeuchi et al.

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