Optical: systems and elements – Holographic system or element – Authentication
Patent
1994-02-04
1997-07-01
Dzierzynski, Paul M.
Optical: systems and elements
Holographic system or element
Authentication
359 32, 359 33, 235457, 283 86, G03H 100
Patent
active
056444125
ABSTRACT:
A hologram which contains the record of a parallel bar-shaped pattern, like a bar code pattern, and which can be read with a single light-receiving element of simple structure with fewer restrictions on the installation position of the light-receiving element and with a minimal lowering in the read accuracy even if the light-receiving element is disposed a little out-of-position. Also disclosed is a method of reading such a hologram. A hologram is recorded in a region that extends in a direction intersecting each bar of a reconstructed bar-shaped pattern and that is not shorter than the length of the reconstructed bar-shaped pattern at least in the above-described direction. Alternatively, the hologram is recorded in a stripe region elongated at the above-described direction. The hologram is read by illuminating it with a reconstructing light beam of small diameter which illuminates only a limited portion of the recording region, receiving diffracted light from the hologram with a single light-receiving element at a position which is coincident with an imagery position where an image of the bar-shaped pattern is formed, or closer to the hologram than imagery position, and at which beams of diffracted light from the hologram are separate from each other, and moving the hologram relative to the reconstructing light beam and the single light-receiving element in a direction intersecting each bar of the reconstructed bar-shaped pattern.
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Horiguchi Ryuji
Yamazaki Satoshi
Dai Nippon Printing Co. Ltd.
Dzierzynski Paul M.
Jr. John Juba
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