| 摘要 |
An identification medium, in which a pattern is clearly altered in observation through a right-handed circularly polarizing filter and observation through a left-handed circularly polarizing filter, is provided. The identification medium is formed by laminating a cholesteric liquid crystal layer 101, a »/4 plate 102, and a linearly polarizing filter layer 103, in that order, from an observing side. The cholesteric liquid crystal layer 101 is formed with a hologram and selectively reflects light. In an observation through a circularly polarizing filter that transmits the light reflected at the cholesteric liquid crystal layer 101, light reflected at a pattern printed layer 105 is not perceived due to the function of a circularly polarizing layer 104. Images are clearly altered by switching a right-handed and a left-handed circularly polarizing filter. |
