| 摘要 |
<p>PURPOSE:To strengthen the whole firmness of an information card using fluorescent substances as information signals, by forming recessed holes or through holes only on the parts having the fluorescent substances while keeping sufficient thickness of the base body to increase transmission of the fluorescent rays. CONSTITUTION:Through holes 1a are drilled on a metallic base plate 1 at proper intervals to form three arrays consisting of codes 1b-1d. The holes 1c, 1d are used as clock array and data array respectively and substance 2a containing the fluorescent substance is charged into the through holes in accordance with data or clock information. At the charging, a substance obtained by mixing the fluorescent powder with transparent epoxy resin is made flow into the through holes and cured. The information card is made of a metal and has sufficient thickness against bending or wear.</p> |
