Optical multilayer body and system
AssigneeNitto Denko Corporation
InventorsMami KAWAGUCHI, Yudai NUMATA, Shoichi MATSUDA, Naoki SATO
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Abstract
An optical multilayer body (100) according to the present invention has a first main surface and a second main surface that is on the reverse side of the first main surface. This optical multilayer body (100) comprises: an optical filter layer (110) which transmits infrared light, while diffusely reflecting visible light; and a recording medium layer (120) which is arranged on the second main surface side of the optical filter layer, while having a pattern that can be read with infrared light through the optical filter layer. This optical multilayer body is configured such that the pattern is not visible through the optical filter layer.
Claims21
An optical stack having a first main surface and a second main surface on the opposite side to the first main surface, the optical stack comprising:
- an optical filter layer transmitting infrared light and diffusely reflecting visible light;
- and
- a recording medium layer disposed on the side of the second main surface with respect to the optical filter layer, the recording medium layer having a pattern readable by the infrared light through the optical filter layer,
- wherein the optical stack is configured such that the pattern is not visible through the optical filter layer.
Dependencies are inferred from the claim text.