Title:
DISCRIMINATION MEDIUM FOR OBJECT AND DISCRIMINATION METHOD
Document Type and Number:
Japanese Patent JP2003231380
Kind Code:
A
Abstract:
To provide a discrimination medium for an object incapable of being forged easily, easy to discriminate genuineness and capable of being reduced in production cost, and a discrimination method for the object.
Both of a support 10 and a film 20 of the discrimination medium A are looked like a red color (but, the film has metal gloss) on a front view and, when a field angle is made large, the film 20 changes to a blue color by a blue shift of a polymeric cholesteric liquid crystal to become a color difference from that of the support 10.
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Inventors:
HOSHINO SHUICHI
TAKEUCHI ITSUO
SASAKI MUTSUMI
TAKEUCHI ITSUO
SASAKI MUTSUMI
Application Number:
JP2002034565A
Publication Date:
August 19, 2003
Filing Date:
February 12, 2002
Export Citation:
Assignee:
NHK SPRING CO LTD
International Classes:
B42D15/10; B44F1/12; B65D55/02; G02B5/30; G02F1/13; G07D7/12; G09F3/00; (IPC1-7): B42D15/10; B44F1/12; B65D55/02; G02B5/30; G02F1/13; G07D7/12
Domestic Patent References:
| JPH04144796A | 1992-05-19 | |||
| JP2000318399A | 2000-11-21 | |||
| JP2001133566A | 2001-05-18 | |||
| JP2001141577A | 2001-05-25 | |||
| JP2000293108A | 2000-10-20 | |||
| JPH0968926A | 1997-03-11 | |||
| JPH07186581A | 1995-07-25 | |||
| JPH06286367A | 1994-10-11 |
Foreign References:
| WO2000013065A1 | 2000-03-09 |
Attorney, Agent or Firm:
Mikio Suenari