Displacement sensor, displacement detecting device, and operation device
AssigneeMurata Manufacturing Co., Ltd.
InventorsMasamichi Ando, Hideki Kawamura
Life of this patent
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Abstract
A displacement sensor having a rectangular shaped elastic member. A piezoelectric element is attached to a first main face of the elastic member. The piezoelectric element has a rectangular-shaped piezoelectric sheet and electrodes on both main faces of the piezoelectric sheet. The piezoelectric sheet is made of poly-L-lactic acid and is at least uniaxially-stretched. The piezoelectric element is attached so that the uniaxial-stretching direction of the piezoelectric sheet is 45° relative to a long-side direction of the elastic member. When the elastic member is bent along the long-side direction, the piezoelectric sheet is stretched along the long-side direction, and the piezoelectric element generates voltage of predetermined level.
Claims8
An operation device comprising:
- a cylindrical columnar shaft;
- and
- a displacement sensor coupled to the cylindrical columnar shaft and constructed to detect a displacement amount when the cylindrical columnar shaft is rotated about a longitudinal axis of the cylindrical columnar shaft and output a detection voltage based thereon,
- wherein the displacement sensor has a piezoelectric element, the piezoelectric element including a pair of opposed electrodes and a piezoelectric sheet therebetween, and is configured to output the detection voltage based on a displacement of the piezoelectric element.
Dependencies are inferred from the claim text.