| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that when conventional rewritable paper which makes use of coloring of fine metal particles is written and allowed to stand for about 1 day, fading occurs. SOLUTION: An optical writing medium is provided in which one or more kinds of fine metal particles having much the same shape are fixed in a composite film comprising fine metal particles and a metal oxide formed on a substrate. COPYRIGHT: (C)2006,JPO&NCIPI
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