To provide a retroreflection sheet at a part of which a destructive layer is disposed and thereby when the retroreflection sheet once attached is torn off in order to divert it to others, the retroreflection sheet is destroyed to make its diversion impossible in regard to the retroreflection sheet used for various kinds of authentication stickers.
A retroreflector is constituted by providing with a tampering prevention layer and a hologram layer on an optical incident side of a surface layer of the retroreflection sheet composed of at least the surface layer and a retroreflection element layer. The tampering prevention layer is made of the destructive layer and the destructive layer is adhered to a base material by further disposing an adhesive layer on an optical incident side of the tampering prevention layer of the retroreflector. Thereafter when exfoliated, the tampering prevention layer is exfoliated by exfoliation at an interface between the destructive layer and the layer closely stuck to the destructive layer and / or destruction of the destructive layer.
| JP2005085768 | LIGHTING SYSTEM |
MIMURA IKUO
TAKAYAMA KEIZO
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