Method for making an improved magnetic encoding device

Details Method for making an improved magnetic encoding device Method for making an improved magnetic encoding device

1979-03-16

1981-01-06

Moon, Charlie T.

Metal working

Method of mechanical manufacture

Assembling or joining

294695, 235493, 365133, 360 2, B23D 1102

Patent

active

042427894

ABSTRACT:
A magnetic encoding device and method for making the same are provided for use as magnetic storage mediums in identification control applications which give output signals from a reader that are of shorter duration and substantially greater magnitude than those of the prior art. Magnetic encoding elements are produced by uniformly bending wire or strip stock of a magnetic material longitudinally about a common radius to exceed the elastic limit of the material and subsequently mounting the material so that it is restrained in an unbent position on a substrate of nonmagnetic material. The elements are spot weld attached to a substrate to form a binary coded array of elements according to a desired binary code. The coded substrate may be enclosed in a plastic laminate structure. Such devices may be used for security badges, key cards, and the like and may have many other applications.

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K. J. Sixtus et al., Physical Review, Apr. 1931, vol. 3, pp. 930-958.
Stress and Magnetostriction, Richard M. Bozorth, _printed 3/1951-6th Reprint, pp. 610-611.

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