ANTI-COUNTERFEIT THREAD, ANTI-COUNTERFEIT SHEET-SHAPED MATERIAL USING IT, AND METHOD OF MANUFACTURING IT

摘要

PROBLEM TO BE SOLVED: To provide a technique for inserting fine semiconductor chips into a sheet- shaped material such as a paper sheet or a plastic sheet in order to further enhance the anti-counterfeit effect of conventional anti-counterfeit paper with threads therein, capable of easily and efficiently inserting even refined semiconductor chips into the sheet-shaped material. SOLUTION: A strip 1 having affixed thereto semiconductor chips 10 each having a built-in memory with a plurality of bits and antenna wiring and each 0.5 mm or less long on one side is either affixed to the surface of the sheet-shaped material or inserted into the sheet-shaped material to obtain the anti-counterfeit sheet-shaped material. The semiconductor chip enables information to be written and read by noncontact method, ensuring a determination as to whether the sheet-shaped material is true or false by reading information recorded in the semiconductor chips contained in the sheet-shaped material. The thread is given timing marks 21 each serving as an indication of the affixed position of the semiconductor chip, so that by inserting the thread into the sheet-shaped material while detecting the marks, the semiconductor chips can be accurately and efficiently inserted into predetermined positions on the sheet-shaped material.