WRITING/READING MEANS FOR SECURITY

摘要

The present invention relates to a writing/reading medium for security. The present invention discloses a detection material layer made of a printable material containing a detection material, and a shielding layer which is formed on at least one surface of the detection material layer and shields the detection material. At this time, when the detection material has water proof and corrosion proof, and usage frequency is 50-3,000 Hz, the detection material is soft magnetic material which has the residual magnetic flux density of 0.1 T or more, the coercive force of 0.01-50 A/m, and the permeability of 0.6-1,300 mH/m. So, the writing/reading medium can be easily detected by a detection gate.