DISPLACEMENT SENSOR, DISPLACEMENT DETECTING DEVICE, AND OPERATION DEVICE
First Claim
1. A displacement sensor comprising:
- an elastic member;
a flat-film-shaped piezoelectric element, the piezoelectric element including a pair of opposed electrodes and a piezoelectric sheet therebetween;
a first insulating element arranged between a first main surface side of the piezoelectric element and the elastic member; and
a second insulating element arranged on a second main surface side of the piezoelectric element opposite to the first main surface side,wherein the piezoelectric sheet contains polylactic acid and was stretched at least in a uniaxial direction thereof, andwherein a Young'"'"'s modulus of the second insulating element is higher than at least that of the piezoelectric sheet.
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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.
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Citations
14 Claims
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1. A displacement sensor comprising:
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an elastic member; a flat-film-shaped piezoelectric element, the piezoelectric element including a pair of opposed electrodes and a piezoelectric sheet therebetween; a first insulating element arranged between a first main surface side of the piezoelectric element and the elastic member; and a second insulating element arranged on a second main surface side of the piezoelectric element opposite to the first main surface side, wherein the piezoelectric sheet contains polylactic acid and was stretched at least in a uniaxial direction thereof, and wherein a Young'"'"'s modulus of the second insulating element is higher than at least that of the piezoelectric sheet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification