Title:
IDENTIFICATION MEDIUM AND METHOD FOR IDENTIFICATION THEREOF
Document Type and Number:
WIPO Patent Application WO/2011/092922
Kind Code:
A1
Abstract:
Disclosed is an identification medium wherein a pattern clearly switches when observed through a right-handed circular polarization filter and a left-handed circular polarization filter. The medium has a structure wherein, from the side of observation, a cholesteric liquid crystal layer (101), which has been hologram-processed, a λ/4 plate (102), and a linear polarization filter layer (103) have been layered. In observations made through a circular polarization filter through which selected reflected light from the cholesteric liquid crystal layer (101) passes, by means of the function of a circular polarization layer (104), the light reflected from a pattern-printed layer (105) is not observed, and when switching the left and right circular polarization filters, the observed image clearly switches.
Inventors:
IDA TOHRU (JP)
Application Number:
PCT/JP2010/069817
Publication Date:
August 04, 2011
Filing Date:
November 08, 2010
Export Citation:
Assignee:
NHK SPRING CO LTD (JP)
IDA TOHRU (JP)
IDA TOHRU (JP)
International Classes:
B42D15/10; G02B5/30; G07D7/12
Domestic Patent References:
| WO2004102234A1 | 2004-11-25 |
Foreign References:
| JP2009172798A | 2009-08-06 | |||
| JP2008203801A | 2008-09-04 | |||
| JP2009172798A | 2009-08-06 |
Other References:
See also references of EP 2530498A4
Attorney, Agent or Firm:
SUENARI, Mikio (JP)
End 成 Mikio (JP)
End 成 Mikio (JP)
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Claims: