Information security – Access control or authentication
Reexamination Certificate
2005-04-11
2010-10-19
Chai, Longbit (Department: 2431)
Information security
Access control or authentication
C726S027000, C726S028000, C726S029000, C726S030000, C380S054000
Reexamination Certificate
active
07818782
ABSTRACT:
The invention relates to an authentication medium capable of eliminating problems with the formation of an authentication portion with and embossed hologram, for instance, difficulty with which fabrication time is cut down, and difficulty with which an authentication pattern is changed due to an increased step counts at the time of embossing mold fabrication. A thin-film layer (2) made up of a material that changes in transmittance of reflectance upon heating, an orientation film (4) that is provided if necessary, and a color change layer (3) such a light selective reflecting layer comprising a cholesteric liquid crystal layer are stacked on a substrate (12). By means of a thermal head or the like, recording is applied to the thin-film layer (2), and changes in the hue of the light selective reflecting layer (3) at a recorded site or the presence or absence of reflection or hues upon observation by way of a circular polarization sheet are observed, thereby solving the above problems.
REFERENCES:
patent: 6061122 (2000-05-01), Hoshino et al.
patent: 2003/0085380 (2003-05-01), Schuhmacher et al.
patent: 2000-255200 (2000-09-01), None
patent: 2002-537149 (2002-11-01), None
patent: 2003-161835 (2003-06-01), None
patent: 2003-1618835 (2003-06-01), None
patent: 2004-338257 (2004-12-01), None
patent: WO 00/13065 (2000-09-01), None
Chai Longbit
Dai Nippon Printing Co. Ltd.
Sughrue & Mion, PLLC
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