MAGNETIC SENSOR

To provide a magnetic sensor for detecting a magnetic field by closed loop control even when the magnetic field to be measured is weak.SOLUTION: The magnetic sensor includes magnetic layers 61 and 62 opposed to each other via a magnetic gap G2, a magnetic sensing element R2 disposed on a magnetic pa...

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Bibliographic Details
Main Author ONODERA IKUTO
Format Patent
LanguageEnglish
Japanese
Published 19.12.2019
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Summary:To provide a magnetic sensor for detecting a magnetic field by closed loop control even when the magnetic field to be measured is weak.SOLUTION: The magnetic sensor includes magnetic layers 61 and 62 opposed to each other via a magnetic gap G2, a magnetic sensing element R2 disposed on a magnetic path formed by the magnetic gap G2, and a compensation coil 70 disposed in the magnetic gap G2 and canceling a magnetic flux applied to the magnetic sensing element R2. According to the present invention, since the magnetic layers 61 and 62 are provided, the magnetic flux can be efficiently applied to the magnetic sensing element R2. Since the compensation coil 70 is disposed in the magnetic gap G2, both the magnetic layers 61 and 62 and the compensation coil 70 can be brought close to the magnetic sensing element, thereby enabling the magnetic field generated from the compensation coil to be efficiently applied to the magnetic sensing element.SELECTED DRAWING: Figure 3 【課題】測定対象となる磁界が微弱であってもクローズドループ制御によって磁界を検出可能な磁気センサを提供する。【解決手段】磁気ギャップG2を介して互いに対向する磁性体層61,62と、磁気ギャップG2によって形成される磁路上に配置された感磁素子R2と、磁気ギャップG2間に配置され、感磁素子R2に印加される磁束を打ち消す補償コイル70と備える。本発明によれば、磁性体層61,62を備えていることから、磁束を効率よく感磁素子R2に印加することができる。しかも、磁気ギャップG2間に補償コイル70が配置されていることから、磁性体層61,62と補償コイル70の両方を感磁素子に近づけることができ、これにより補償コイルから発生する磁界を感磁素子に効率的に印加することが可能となる。【選択図】図3
Bibliography:Application Number: JP20180111194