Piezoelectric sensor and pressure detection apparatus
First Claim
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1. A piezoelectric sensor comprising:
- an upper electrode;
a lower electrode; and
a piezoelectric layer interposed between the upper electrode and the lower electrode;
at least one of the upper electrode and the lower electrode including a plurality of electrode patterns;
the upper electrode including a plurality of first pattern electrodes extending in a first direction;
the lower electrode including a plurality of second pattern electrodes extending in the same direction as that of the first pattern electrodes; and
at least one of the following;
a width of the first pattern electrodes becomes larger as the first pattern electrodes approach a peripheral portion of the piezoelectric layer; and
a width of the second pattern electrodes becomes larger as the second pattern electrodes approach the peripheral portion of the piezoelectric layer.
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Abstract
A piezoelectric sensor in which position detection and load detection can be achieved. The piezoelectric sensor includes a piezoelectric layer interposed between the upper electrode and the lower electrode. In the piezoelectric sensor, at least one of the upper electrode and the lower electrode includes a plurality of electrodes patterns.
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Citations
17 Claims
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1. A piezoelectric sensor comprising:
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an upper electrode; a lower electrode; and a piezoelectric layer interposed between the upper electrode and the lower electrode; at least one of the upper electrode and the lower electrode including a plurality of electrode patterns; the upper electrode including a plurality of first pattern electrodes extending in a first direction; the lower electrode including a plurality of second pattern electrodes extending in the same direction as that of the first pattern electrodes; and at least one of the following; a width of the first pattern electrodes becomes larger as the first pattern electrodes approach a peripheral portion of the piezoelectric layer; and a width of the second pattern electrodes becomes larger as the second pattern electrodes approach the peripheral portion of the piezoelectric layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A piezoelectric sensor comprising:
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an upper electrode; a lower electrode; and a piezoelectric layer interposed between the upper electrode and the lower electrode, the piezoelectric layer including; a first piezoelectric layer in contact with the upper electrode; a second piezoelectric layer in contact with the lower electrode; and a reference electrode arranged between the first piezoelectric layer and the second piezoelectric layer; at least one of the upper electrode and the lower electrode including a plurality of electrode patterns; the upper electrode including a plurality of first pattern electrodes extending in a first direction; and the lower electrode including a plurality of second pattern electrodes extending in the same direction as that of the first pattern electrodes.
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15. A piezoelectric sensor comprising:
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an upper electrode; a lower electrode; and a piezoelectric layer interposed between the upper electrode and the lower electrode; at least one of the upper electrode and the lower electrode including a plurality of electrode patterns; the upper electrode including a plurality of first pattern electrodes extending in a first direction; the lower electrode including a plurality of second pattern electrodes extending in the same direction as that of the first pattern electrodes; and at least one of the following; the first pattern electrodes have a concave-convex shape, and the first pattern electrodes are arranged such that convex portions and concave portions of the concave-convex shape engage with each other between the first pattern electrodes, and a pitch interval of the first pattern electrodes is shorter than a length of a shorter diameter of a contact surface formed when an input makes contact with the piezoelectric sensor; and the second pattern electrodes have a concave-convex shape, and the second pattern electrodes are arranged such that convex portions and concave portions of the concave-convex shape engage with each other between the second pattern electrodes, and a pitch interval of the second pattern electrodes is shorter than the length of the shorter diameter of the contact surface formed when the input makes contact with the piezoelectric sensor. - View Dependent Claims (16, 17)
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Specification