Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
OBJECT IDENTIFICATION MEDIUM AND IDENTIFICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2004/102234
Kind Code:
A1
Abstract:
An identification medium (10a) includes a first two-layered body (101) consisting of a right circular polarization polymer cholestric liquid crystal layer (11) reflecting light of particular right circular polarization and a left circular polarization polymer cholestric liquid crystal layer (12) reflecting light of particular left circular polarization. The identification medium (10a) is attached to an object (30) and by visual watch through a simplified judgment device (20) having a filter (21) passing only light of right circular polarization and a filter (22) passing through only light of left circular polarization, it is possible to see the color of the right circular polarization polymer cholestric liquid crystal layer (11) at the side of right circular polarization filter (21) and the color of the left circular polarization polymer cholestric liquid crystal layer (12) at the side of the left circular polarization filter (22). Thus, by checking a peculiar phenomenon caused by the identification medium (10a) which cannot be reproduced normally, it is possible to easily and surely authenticate the object (30).

More Like This:
JPH0636120INFORMATION PROCESSOR FOR CAR DRIVING LICENSE IC CARD
Inventors:
HOSHINO HIDEKAZU (JP)
TAKEUCHI ITSUO (JP)
Application Number:
PCT/JP2004/006545
Publication Date:
November 25, 2004
Filing Date:
May 14, 2004
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NHK SPRING CO LTD (JP)
HOSHINO HIDEKAZU (JP)
TAKEUCHI ITSUO (JP)
International Classes:
B42D15/10; B44F1/12; G02B5/30; (IPC1-7): G02B5/30; G02B5/32; B42D15/10
Domestic Patent References:
WO2000013065A12000-03-09
WO1998052077A11998-11-19
Foreign References:
JP2000273421A2000-10-03
JP2002537149A2002-11-05
JP2000255200A2000-09-19
JPH11151877A1999-06-08
JPH1142875A1999-02-16
JPH09319566A1997-12-12
JPH1142875A1999-02-16
JP2000255200A2000-09-19
Other References:
See also references of EP 1628147A4
Attorney, Agent or Firm:
Suenari, Mikio (6-13 Kyobashi 1-chome, Chuo-k, Tokyo 31, JP)
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: DIFFRACTION ELEMENT AND PROJECTION OBJECTIVE COMPRISING SUCH AN ELEMENT

Next Patent: A SIDE COUPLED OPTICAL WAVEGUIDE DEVICE