| 摘要 |
<p>PURPOSE:To easily discriminate information without generating a noise even when the light reflectivity of a printed body is large. CONSTITUTION:This method is an information reading method which prints information on the surface of a metallic base body or a base material which transmits infrared rays of 2 to 10mum in wavelength with marking ink containing tin oxide, indium-tin mixed oxide, or mixture of >=1 kinds among tin oxide, indium-tin mixed oxide and alumina, barium sulfide, silicon dioxide, and calcium carbonate, coats the surface with clear paint or colored ink at need, and identifies the information by an infrared-ray CCD camera or infrared detector of 2 to 10mum in wavelength.</p> |
