| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrain actualization of variation of detection sensitivity due to a security thread while suppressing conveyance jams. <P>SOLUTION: Permanent magnets 212 are arranged with reverse magnetic poles meeting each other and, since the ties of magnetic fluxes are strong on the magnetic boundaries of adjoining permanent magnets 212 and therefore easily causing a drop in sensitivity, conveyance roller bodies are so arranged as for the loops of the rollers are positioned on the magnetic boundaries; magnetic resistance elements 214 are arranged in the central areas of the permanent magnets 212 where the detection sensitivity is higher so as for the high sensitivity areas of the elements 214 to be positioned in the central areas, and the conveyance roller bodies are arranged adjacent, with the high sensitivity areas of the magnetic resistance elements 214 placed in-between. <P>COPYRIGHT: (C)2012,JPO&INPIT |
