異物検出装置

Foreign object detection device

Abstract

PROBLEM TO BE SOLVED: To provide a foreign object detection device for detecting the size of a metal foreign object mixed in a specimen.SOLUTION: There is provided a foreign object detection device which includes: placement means; first magnetism application means; first magnetism detection means; second magnetism application means; second magnetism detection means; and calculation means for measuring the size of a metal foreign object on a specimen. A first angle made by a first magnetism application direction and the placement means is different from a second angle made by a second magnetism application direction and the placement means. A first application distance between the first magnetism application means and the placement means when the first magnetism is applied is equal to a second application distance between the second magnetism application means and the placement means when the second magnetism is applied. A first detection distance between the first magnetism detection means and the placement means when the first specimen magnetism is detected is equal to a second detection distance between the second magnetism detection means and the placement means when the second specimen magnetism is detected.
【課題】被検物に混入した金属異物の大きさを検出する異物検出装置の提供を目的とする。 【解決手段】本発明は、載置手段と、第1磁気印加手段と、第1磁気検出手段と、第2磁気印加手段と、第2磁気検出手段と、被検物上の金属異物の大きさを測定する演算手段と、を備え、前記第1磁気の印加方向と前記載置手段とが成す第1角度と、前記第2磁気の印加方向と前記載置手段とが成す第2角度と、が異なる角度であり、前記第1磁気を印加する際の前記第1磁気印加手段と前記載置手段との第1印加距離と、前記第2磁気を印加する際の前記第2磁気印加手段と前記載置手段との第2印加距離と、が等しい距離であり、前記第1被検磁気を検出する際の前記第1磁気検出手段と前記載置手段との第1検出距離と、前記第2被検磁気を検出する際の前記第2磁気検出手段と前記載置手段との第2検出距離と、が等しい距離である異物検出装置を提供する。 【選択図】図1

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