| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a metal detector capable of stably and highly sensitively detecting a minute metal included in an inspection object with influence of disturbance noise eliminated. <P>SOLUTION: A metal detector comprises: a magnetizing part 30 for magnetizing a metal m included in an inspection object W; a detection head 40 that includes a plurality of magnetic sensors 41a to 41c and 42a to 42c having sharp directivity along an orthogonal direction orthogonal to a conveyance direction of the inspection object W and arranged along the orthogonal direction, and for detecting a residual magnetic component of the metal m included in the inspection object W magnetized by the magnetizing part 30; a magnetic shield 49 disposed in the orthogonal direction of the detection head 40 so as to surround a part of a conveyance path for blocking noise entering the inside of the detection head 40; and projections 81 projecting from the surface of the inner wall of the magnetic shield 49 toward the magnetic sensors 41a to 41c and 42a to 42c in the vicinity of the plurality of magnetic sensors 41a to 41c and 42a to 42c arranged in lines. <P>COPYRIGHT: (C)2012,JPO&INPIT |
