Patent ID: 9213929
Filing Date: 2015-12-15
Classification: G02F,G06K

Abstract:
1. A pattern printed sheet comprising a substrate and a non-visible light-reflective transparent pattern printed on a surface of the substrate, wherein an ink for forming the transparent pattern contains a non-visible light-reflective material capable of selectively reflecting a light having a wavelength in a non-visible light range, a non-visible light reflectance of the transparent pattern as measured at a peak selective reflection wavelength being 13 to 50%, and the transparent pattern has a dot pattern, and has a multilayer structure in section which is repeated at predetermined intervals and, when observing a section of the structure, a repeated layer structure appears every 180° when the liquid crystal molecule is rotated, as observed by a scanning electron microscope, and reflects only a circular polarization component in a predetermined rotation direction relative to an incident light applied thereto, wherein the multilayer structure is formed from a liquid crystal material having a fixed cholesteric structure, wherein the liquid crystal material having a fixed cholesteric structure is made of a chiral nematic liquid crystal material formed by mixing a nematic liquid crystal with a chiral agent, wherein the nematic liquid crystal is in the form of a compound having an acrylate structure, the non-visible light reflectance being attained by the liquid crystal material having the fixed cholesteric structure, wherein the transparent pattern printed has a thickness of from 1 to 20 μm, and wherein the nematic liquid crystal includes a compound represented by a formula selected from the group consisting of the following formulae (1), (2), (4)-(9), and (11): wherein in formula (11), X