The genuineness the genuineness of the detected material and this detected material which are checked manner and the device null which are checked

摘要

PURPOSE:To enhance security and durability by mixing many magnetic polymer elements in a scanning region of a matter to be checked at random, and using an inherent detection signal obtained by magnetically scanning the region for checking genuineness of the matter to be checked. CONSTITUTION:A matter 10 to be checked for genuineness to need to prevent forgery of securities, bank note, ID card, etc., comprises many magnetic polymer elements 12 mixed at random to be directed in directions of an unspecified number of the general public in a base material 1 made of nonmagnetic material such as sheet, plastic, etc. As the element 12, a wirelike element in which a magnetic metal powder 14 made of a high permeability magnetic material, or a high coercive force material is mixed with an element body 13 made of a polymer material such as a known synthetic resin, etc., having flexibility is used. A code display unit 18 provided by enciphering inherent information responsive to a distributed state of the element 12 in a scanning region 17 by a processor is provided in the matter 10 to be checked.