Registers – Records – Laminated
Patent
1986-02-19
1987-06-30
Trafton, David L.
Registers
Records
Laminated
235457, 235487, 430 1, G06K 1902
Patent
active
046772855
ABSTRACT:
An identification article comprise a substrate and a pattern-form Fresnel hologram provided as an identification information providing layer on the surface or in the interior of the substrate structure. The pattern-form Fresnel hologram is formed by (a) forming a Fresnel hologram by exposing a photosensitive resin layer to an interference light obtained from interference between an object light beam and a reference light beam both obtained by dividing a single coherent light, (b) exposing the Fresnel hologram to light transmitted through a mask pattern, (c) fabricating a pattern-form Fresnel hologram by developing the Fresnel hologram, and (d) reconstructing the pattern-form Fresnel hologram thus obtained. The identification article is verified by projecting a monochromatic light onto the hologram to reproduce an image and projecting this image on a screen or detecting it with a light detector.
REFERENCES:
patent: 3753249 (1973-08-01), Silverman
patent: 3894756 (1975-07-01), Ward
patent: 4014602 (1977-03-01), Ruell
patent: 4171864 (1979-10-01), Jung et al.
patent: 4269473 (1981-05-01), Flothmann et al.
patent: 4402571 (1983-09-01), Cowan et al.
Dai Nippon Insatsu Kabushiki Kaisha
Trafton David L.
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