| 摘要 |
PURPOSE:To enhance the security and transmit information correctly even in case of flaw and dirt by using invisible infrared rays as an information signal. CONSTITUTION:A substrate 1 consists of an infrared rays-transmissive material such as a glass, a resin, a paper, or the like. An infrared-rays-transmissive material such as aluminium, copper, carbon black, or the like is formed on this substrate 1 by a thin film forming method such as vacuum deposition, sputtering, printing, or the like to form a pattern 2. A semiconductor film 3 is provided on the substrate 1 and an information pattern 2 by the vacuum deposition method or the like for the purpose of covering the information pattern 2. Further, a protection film 4 is provided. |
