Nhk Spring Co., Ltd.

Tooru Ida

Hidekazu Hoshino

Itsuo Takeuchi

Tokio Sakauchi

Seiya Shibuya

Shinei Suzuki

An identification medium can be used in an opening label, clearly show signs of it having been opened, and also have a superior authenticity-confirming function. The identification medium has a structure including, in the following order as seen from the side of observation: an optical function layer that generates a color shift, a separation layer that is partially formed, a printed layer, and an adhesive layer, in which when an adhesive strength between the adhesive layer and an adherend is set to be Xa, an adhesive strength between the adhesive layer and the printed layer is set to be Xb, and an adhesive strength at a portion in which the separation layer is laminated between the optical function layer and the printed layer is set to be Xc, the adhesive strength of each part is set to satisfy Xa&#x3e;Xb&#x3e;Xc or Xb&#x3e;Xa&#x3e;Xc.

Identification medium

In an identification medium, switching of images can be clearly observed, and the medium has a structure produced at low cost. The structure comprises a cholesteric liquid crystal layerin which a hologram is formed, and which selectively reflects circularly polarized light of a specific rotating direction of a specific central wavelength, a cholesteric liquid crystal layer reflecting the entire range of visible lightwhich has reflection characteristics equivalent to a case of reflecting the entire range of visible light and which reflects circularly polarized light of the same rotating direction as the circularly polarized light reflected from the cholesteric liquid crystal layer, and a display patternhaving a specific content displayed, arranged in this order, as seen from the side of observation.

Growing community of inventors

Yokoahama, Japan

Tooru Ida