| 摘要 |
<p>PURPOSE:To obtain high security to display use history information by providing a plurality of display parts having different recording characteristics for displaying the information of a memory medium. CONSTITUTION:A magnetic recording layer 2 of a memory is provided on one surface of a substrate 1 made of white vinyl chloride, etc., and a metal tin thin film 3 and a thermoplastic resin protective layer 4 are sequentially provided on the layer 2. The layers 3 and 4 constitute a metal fracture thermal recording layer 5 of a first display part. A reflecting layer 7 made of an aluminum thin layer and a variable recording layer 8 of a second display part are sequentially provided on the other surface of the substrate 1. A permeable protective layer 9 and a preprinted layer 10 printed with fixed information are sequentially provided thereon. Since this medium has different recording energizes of the two display parts, even if the display of either one surface is forged, its display function is destroyed or it cannot be recorded even if the other surface is intended to be recorded under the same conditions.</p> |
