Patent ID: 7742136
Filing Date: 2010-06-22
Classification: B41M,B42D,G03C

Abstract:
1. A method of manufacturing a sheet with anti-counterfeit functions, comprising: forming a transparent base having ultraviolet ray absorbing properties; forming, on the transparent base, a cholesteric liquid crystal layer having an original selective reflected wavelength band in at least a visible region and having approximately uniform thickness, forming an authentication region having a selective reflective wavelength band that is different from the original selective reflective wavelength band by irradiating one side surface of the cholesteric liquid crystal layer formed on the transparent base with ultraviolet rays which have been patterned on the basis of authentication information to be recorded; and after irradiating the one side surface of the cholesteric liquid crystal layer, then irradiating an other side surface of the cholesteric liquid crystal layer with ultraviolet rays through the transparent base to fix the authentication region formed by irradiating the one side surface of the cholesteric liquid crystal layer.