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Title:
DEVICE FOR DETERMINING AUTHENTICITY OF SECURITY MEDIUM THAT INCLUDES REFLECTION-TYPE VOLUME HOLOGRAM, METHOD FOR DETERMINING AUTHENTICITY OF SECURITY MEDIUM THAT INCLUDES REFLECTION-TYPE VOLUME HOLOGRAM, AND SECURITY MEDIUM THAT INCLUDES REFLECTION-TYPE VOLUME HOLOGRAM
Document Type and Number:
WIPO Patent Application WO/2016/067755
Kind Code:
A1
Abstract:
[Problem] To provide a device for determining the authenticity of a security medium that includes a reflection-type volume hologram, a method for determining the authenticity of a security medium that includes a reflection-type volume hologram, and a security medium that includes a reflection-type volume hologram, with which it is possible to easily determine authenticity. [Solution] A device 1 for determining the authenticity of a security medium 10 that includes a reflection-type volume hologram 2 is characterized in being provided with a light source L disposed on the obverse surface side so as to impinge upon the reflection-type volume hologram 2, a first observation device 11 disposed in a preset direction of diffraction of the reflection-type volume hologram 2, and a second observation device 12 disposed in a direction other than the preset direction of diffraction of the reflection-type volume hologram 2; the reflection-type volume hologram 2 being determined to be authentic when light including a preset diffraction wavelength impinges from the light source L upon the reflection-type volume hologram 2, light whose intensity in the diffraction wavelength is higher than the intensity in other wavelengths is observed by the first observation device 11, and light whose intensity in the diffraction wavelength is lower than the intensity in other wavelengths is observed by the second observation device 12.

Inventors:
KITAMURA MITSURU (JP)
YAMAUCHI TSUYOSHI (JP)
ETO KOJI (JP)
OIKAWA NOBUKO (JP)
SATO TOMOE (JP)
Application Number:
PCT/JP2015/075369
Publication Date:
May 06, 2016
Filing Date:
September 07, 2015
Export Citation:
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Assignee:
DAINIPPON PRINTING CO LTD (JP)
International Classes:
G03H1/02; B42D25/328; G06K7/10; G07D7/12
Foreign References:
JP2007268896A2007-10-18
JP2007093779A2007-04-12
JPH03188481A1991-08-16
JPH0721335A1995-01-24
JPH04317190A1992-11-09
JPH04340583A1992-11-26
Other References:
See also references of EP 3214505A4
Attorney, Agent or Firm:
KOYAMA, Takashi et al. (JP)
Takushi Koyama (JP)
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