专利名称：Usage null of record media and record 发明人：吉岡 康明，檀上 耕太郎
申请号：JP特願平5-117854
申请日：19930421
公开号：JP特許第3440334号(P3440334)B2
公开日：
眉佳20030825钢琴曲
专利内容由知识产权出版社提供
从头至尾摘要：PURPOSE:To provide a recording medium improving extremely a curity property, its using method, and its reader by a method wherein a transparent state and an opaque state of a thermally reversible recording layer is ud when a recorded content of an optical diffraction recording layer is read. CONSTITUTION:A recording medium 1 is provided by accumulating an optical diffraction recording layer 3 consisting of diffraction grating or hologram, a thermally reversible recording layer 4 wherein a transparent state and an opaque state are reversibly varied by heating, and as required, a colored layer 5 on a ba material 2. Then, before reading a recorded content of the optical diffraction recording layer 3, the thermally reversible recording layer 4 is made transparent by heating. After reading, it is made opaque by heating the thermally reversible recording layer 4. Since the optical diffraction recording layer 3 is concealed with the thermally reversible recording layer 4 excepting in reading, even card's owner can not recognize the formation of the optical diffraction recording layer 3.对学生干部的认识
申请人：大日本印刷株式会社
地址：東京都新宿区市谷加賀町一丁目1番1号
国籍：JP
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代理人：金山 聡
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