| 摘要 |
PROBLEM TO BE SOLVED: To manufacture an electronic recording paper on which an alteration remains as a proof in the case the alteration is applied on a content recorded on a document. SOLUTION: An electronic recording paper with altered history recording function is formed of an upper sheet 100 of the electronic recording paper and a lower sheet 200 stuck together on which patterns of the electronic recording paper are formed. When an attempt to erase a content recorded on the upper sheet 100 is applied, patterns on a corresponding part of the lower sheet 200 is also erased. The alteration of the content recorded on the electronic recording paper with altered history recording function, therefore, is displayed and detected in the form of alteration of the patterns on the corresponding part of the lower sheet. In the case of constituting the electronic recording paper with altered history recording function is formed of a single sheet, sophisticated patterns such as patterns including cipher codes or the like are printed on the sheet. Even in the case of such a constitution, when the alteration of erase is applied to the content recorded on the electronic recording paper, the cipher code portion is erased and the proof of alteration remains thereon. |
