Dai Nippon Printing Co., Ltd.

Kiyoshi Imaizumi

Minoru Komada

Kazuyuki Takasawa

Tetsuji Ogata

Takeshi Iihara

Hiroyuki Asakura

A noncontact IC tagcomprises a base film, a noncontact IC circuitformed on the base film, and a plastic film or paper serving as a surfacing sheet, having a non-conductive, lustrous metal filmformed by deposition, laminated to the base filmon the side of the noncontact IC tag circuit. The surface roughness of the non-conductive, lustrous metal film, determined by atomic force microscopy, is more than 10 nm and 100 nm or less as indicated by the center line average height Ra. In the case where the non-conductive, lustrous metal filmis formed on the outer surface of the surfacing sheet, a concealing layermay further be formed on the inner surface of the surfacing sheetin order to enhance concealing properties.

Noncontract IC tag with non-conductive metal film

A noncontact IC tagcomprises a base film, an antenna patternand an IC chipthat are on the base film, and a surface-protective membercovering the antenna patternand the IC chipBetween the surface-protective memberand the base filmare present two strip membersthat are placed in parallel on both sides of the IC chipso that a bet-shaped spaceis made between them. The IC chipis positioned in this belt-shaped spaceFor the strip members, it is preferable to use, paper, a plastic film, or a magnetic sheet with a uniform thickness of 50 to 250 &#x3bc;m.

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Tokyo, Japan

Kiyoshi Imaizumi