| 摘要 |
<p>PURPOSE:To make it difficult to alter and forge by forming an information record medium capable of reading with supersonic wave in such a manner that a supersonic wave absorbing layer, a data section made of material which reflects the supersonic wave, and a shielding layer which makes data invisible are provided in sequence on a substrate. CONSTITUTION:A card information record medium 1 is constituted in such a manner that a supersonic wave absorbing layer 3, a data section 4 consisting of material which reflects the supersonic wave, a shielding layer 5 which makes data invisible, and a protective layer 6 are provided in sequence on a substrate 2 consisting of resin, paper, and synthetic paper. The supersonic wave absorbing layer 3 is made of a material which absorbs the supersonic wave sufficiently, for example, a material having viscoelasticity such as rubber and urethane resin. The data section 4 is made, for example, of particle material having a hollow structure with cavity sealing air and gas therein, and the casing thereof is made of resin such as acryl. The shielding layer 5 is made of a resin in which pigment impermeable of visible light is dispersed. The protective layer 6 is made of a resin having abrasion resistance and chafe resistance.</p> |
