Authenticating medium and authenticatable substrate
AssigneeDai Nippon Printing Co., Ltd.
InventorTae Saito
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Abstract
An authenticating medium that includes a hologram which is used for authentication or other purposes thereby making more complicated appearance and ease of authentication unnecessary. The medium includes a cholesteric liquid crystal layer (3) on an upper or lower surface of a transparent substrate (2), a hologram-formation layer (4) on a lower surface thereof, and reflective metal layers (5) along the fine relief of the hologram-formation layer (4). The reflective metal layers (5) are formed in a patterned form, as viewed from above, thereby obtaining an authenticating medium (1) capable of solving problems with the prior art. The cholesteric liquid crystal layer may be provided in a double-layer form, and may further have an adhesive layer (7) on the bottom.
Claims4
An authenticating medium, characterized by comprising a cholesteric liquid crystal multilayer structure comprising at least two cholesteric liquid crystal layers laminated on at least a viewing side of a transparent substrate, wherein a hologram-formation layer having a fine hologram relief formed on a surface of a transparent resin layer is laminated on a non-viewing side of said cholesteric liquid crystal multilayer structure, and reflective metal layers are laminated in a pattern form on a surface of said hologram-formation layer with the fine relief formed on it,
- and
- at least a part of one of said cholesteric liquid crystal layers being in a patterned form.
Dependencies are inferred from the claim text.