Title:
HOLOGRAM SHEET
Document Type and Number:
Japanese Patent JP2011248014
Kind Code:
A
Abstract:
To provide a novel hologram sheet using a hologram that reproduces a hologram reproduction image having a wavelength different from an illumination light in contrast with a hologram that reproduces a hologram reproduction image having the same wavelength as the illumination light in order to improve the authenticity thereof.
A photochromic thin film layer is provided on a hologram formation layer and the photochromic thin film layer is irradiated with an exciting light. A hologram reproduction image caused by the color tone of the light emission in the visible light region is made visually determinable, thereby an improved forgery prevention effect is achieved.
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Inventors:
UEMATSU NAOKO
DANJO KOTARO
DANJO KOTARO
Application Number:
JP2010119724A
Publication Date:
December 08, 2011
Filing Date:
May 25, 2010
Export Citation:
Assignee:
DAINIPPON PRINTING CO LTD
International Classes:
G03H1/18; B42D15/10; G02B5/18; G02B5/32; G03H1/02
Attorney, Agent or Firm:
Satoshi Kanayama
Keiko Fukamachi
Hideo Ito
Hiromi Fujimasu
Naoki Goto
Yusuke Ito
Keiko Fukamachi
Hideo Ito
Hiromi Fujimasu
Naoki Goto
Yusuke Ito
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