Method for making an improved magnetic encoding device
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.
- Assignee:
- Department of Energy
- Patent Number(s):
- US 4242789
- Application Number:
- TRN: 81-015838
- OSTI ID:
- 6333887
- Resource Relation:
- Patent File Date: Filed date 16 Mar 1979; Other Information: PAT-APPL-021291
- Country of Publication:
- United States
- Language:
- English
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