Optical: systems and elements – Holographic system or element – Authentication
Patent
1995-08-29
1997-11-11
Dzierzynski, D. M.
Optical: systems and elements
Holographic system or element
Authentication
359 10, 359 25, 359 28, 283 86, G03H 100
Patent
active
056870124
ABSTRACT:
A hologram is formed using a grating and a second hologram serving as an image hologram. The grating is constituted by a plurality of areas whose spatial frequencies and diffraction directions are different from each other. This grating is formed using a grating array and a mask. The second hologram has a plurality of areas each of which records information or image (e.g., ID data) serving as a recording target as an element hologram. The second hologram is formed using a Fresnel hologram serving as a first hologram. The first hologram can also be formed using a mask and a diffuser on which ID data is projected. On the hologram, information (pattern or image) is recorded with each of reference light components having different directions corresponding to the different small areas. Even if illumination light having a uniform wavefront is irradiated on this hologram, it is difficult to detect all the information (pattern and image).
REFERENCES:
patent: 4265509 (1981-05-01), McMahon
patent: 4547037 (1985-10-01), Case
patent: 4889780 (1989-12-01), Cosner
patent: 5486933 (1996-01-01), Shindo et al.
Kang Der-Kuan
Toda Toshiki
Dzierzynski D. M.
Schuberg Darren E.
Toppan Printing Co. Ltd.
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