Optical data element including a diffraction zone with a multipl

Details Optical data element including a diffraction zone with a multipl Optical data element including a diffraction zone with a multipl

1995-12-05

1998-09-22

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235494, G06K 710

Patent

active

058117750

ABSTRACT:
An optical data element includes a plurality of diffraction zones wherein each zone contains a multiplicity of diffraction gratings. These zones may be illuminated and the resultant one or more diffracted beams detected to provide a signature for the element consisting of a series of discrete signature signals each generated by the plurality of zones and each including portions or relatively different intensities. At least one of the diffraction zones has a segment thereof modified whereby to discernibly alter at least one of the discrete signature signals of the signature and to thereby form a data segment of the optical data element.

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patent: 4143810 (1979-03-01), Greenaway
patent: 5291027 (1994-03-01), Kita et al.

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