POSITION DETECTION DEVICE

[Object] To provide a position detection device that includes a magnetic sensor and that can suppress variation in linearity of measured values due to a temperature change. [Solution] A movement unit 10 is provided with a first magnet 11 and a second magnet 12. A detection unit 20 includes a first m...

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Bibliographische Detailangaben
Hauptverfasser:	SAITO, Taku, TOKUNAGA, Ichiro, YASUDA, Yukiko
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS MEASURING MEASURING ANGLES MEASURING AREAS MEASURING ELECTRIC VARIABLES MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS MEASURING MAGNETIC VARIABLES MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR PHYSICS TARIFF METERING APPARATUS TESTING
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Beschreibung
Zusammenfassung:	[Object] To provide a position detection device that includes a magnetic sensor and that can suppress variation in linearity of measured values due to a temperature change. [Solution] A movement unit 10 is provided with a first magnet 11 and a second magnet 12. A detection unit 20 includes a first magnetic sensor having an axis of sensitivity Sx and a second magnetic sensor having an axis of sensitivity Sz. The movement unit 10 and the detection unit 20 are movable relatively to each other along a movement trajectory Tx. The magnets 11 and 12 have facing surfaces 11a and 12a, each of which is a projecting curved surface having a shape such that both ends thereof are positioned farther away from the movement trajectory Tx than a center portion thereof. This shape can suppress the linearity error for measured values when the magnets are demagnetized in a high-temperature environment.