PROBLEM TO BE SOLVED: To provide a position detection device that allows a simpler configuration to curb absorption of a foreign matter.SOLUTION: A position detection device 20 comprises: a magnet 33; and a magnetic sensor 34 that detects a magnetic flux change occurring by an advancement of a subject 22 (a lateral wall part 22b of the subject) between the magnet 33 and the magnetic sensor on a first magnetic pole (N-pole) side of the magnet 33. Then, the position detection device 20 comprises a magnetic shield 40 that has a magnetic gap X (X1, X2 and X3) between the magnet 33 and the position detection device, and is composed of a magnetic body provided on a second magnetic pole (S-pole) side of the magnet 33.SELECTED DRAWING: Figure 4
【課題】より簡素な構成にて、異物の吸着を抑制することのできる位置検出装置を提供すること。【解決手段】位置検出装置20は、マグネット33と、このマグネット33の第1磁極(N極)側において当該マグネット33との間に被検出体22(の横壁部22b)が進入することにより生ずる磁束変化を検出する磁気センサ34と、を備える。そして、位置検出装置20は、そのマグネット33との間に磁気ギャップX(X1,X2,X3)を有して当該マグネット33の第2磁極(S極)側に設けられた磁性体からなる磁気シールド40を備える。【選択図】図4
POSITION DETECTION DEVICE
位置検出装置
2016-05-30
Patent
Electronic Resource
Japanese
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