Patent ID: 6628439
Filing Date: 2003-09-30
Classification: B42D,G03H,G07D

Abstract:
An authenticity identifying film comprising:a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectively to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, wherein the reflective film is provided with a hologram forming part that reflects circularly polarized light of the same circular polarization as that of the reflected light in a direction different from that of the reflected light to form a holographic image, and wherein the reflective film comprises a front surface on the light incidence side and a rear surface on the side opposite to the light incidence side, and the front surface of the reflective film is a flat surface and the hologram forming part is provided on the rear surface of the reflective film causing the thickness of the reflective film to vary due to the thickness variation of the hologram forming part.