Anti-counterfeiting structure
An anti-counterfeiting structure includes a substrate having a surface, and an device structure positioned on the surface. A side opposite to the side on which the substrate is positioned with respect to the device structure is an observation side, and the device structure comprises an optical device layer that emits predetermined light towards the observation side, and an information portion that contains given information. The information portion comprises a first substance having optical transparency, wherein the first substance is changeable to a second substance having a different optical characteristic from the first substance by laser irradiation, and the second substance representing information. The device structure has a display surface that is a surface opposite to the surface on which a surface of the substrate, and is configured so as to display information contained in the information portion via the display surface.
1. An anti-counterfeiting structure, comprising:
a substrate having a first surface and a second surface, which is opposite to the first surface; and,
a support substrate in contact with the first surface of the substrate;
a device structure on a first portion of the second surface of the substrate;
a coating layer covering the device structure and a second portion of the second surface of the substrate, wherein the second portion is a portion of the second surface of the substrate other than the first portion of the second surface of the substrate;
wherein a side opposite to the side on which the substrate is positioned with respect to the device structure is an observation side;
wherein the device structure comprises:
a peeling layer, an optical device layer, and an adhesive layer, stacked in this order and adjacent to each other, wherein the optical device layer diffracts predetermined light towards the observation side, the optical device layer comprises a relief structure layer and a reflecting layer, the relief structure layer contains a first element composed of a first substance and a plurality of second elements containing a second substance, the plurality of second elements represent first element information, the first element and each of the second elements extend through an entire thickness of the relief structure layer between the reflective layer and the peeling layer.
2. The anti-counterfeiting structure of claim 1 , wherein the relief structure layer comprises a polymer material and the reflecting layer comprises a high refractive index material or a metal material.
3. The anti-counterfeiting structure of claim 2 , wherein the reflecting layer comprises a high refractive index material selected from MgO 2 , TiO 2 , Si 2 O 3 , SiO, Fe 2 O 3 , and ZnS.
4. The anti-counterfeiting structure of claim 1 , wherein the peeling layer comprises an optically transparent, heat-resistant thermoplastic resin selected from a polyetherimide resin, a polyamideimide resin, and a polyimide resin.
5. The anti-counterfeiting structure of claim 4 , wherein the thermoplastic resin is a polyamideimide resin.
6. The anti-counterfeiting structure of claim 1 , wherein an adhesive strength between the coating layer and the device structure is lower than an adhesive strength between each pair of individual layers of the device structure.
7. The anti-counterfeiting structure of claim 1 , wherein the device structure consists of the peeling layer, the relief structure layer, the reflecting layer and the adhesive layer stacked in this order, wherein the adhesive layer is in direct contact with the second surface of the substrate.
8. The anti-counterfeiting structure of claim 1 , wherein each the first substance and the second substance has fluorescence properties.