PRESSING DETECTOR AND ELECTRONIC DEVICE
First Claim
1. A pressing detector, comprising:
- a piezoelectric element configured to generate an electric charge based on an amount of displacement of an operation surface;
a displacement detection element configured to generate an output value based on the amount of the displacement of the operation surface; and
a pressing detection unit configured to;
calculate an integrated value of a voltage generated by the electric charge generated by the piezoelectric element,intermittently operate the displacement detection element, andcorrect the calculated and integrated value of the voltage based on the output value generated by the displacement detection element.
1 Assignment
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Accused Products
Abstract
A pressing detector and an electronic device that properly corrects an integrated value at any timing. An electronic writing instrument includes a housing, an operation unit, and a pressing detector, which includes a plurality of electrodes, a piezoelectric film, a base material, a strain resistive element, a base material, a ground electrode, and a circuit including a detection unit. When an operation surface is displaced due to pressing or release of pressing by an operator, a resistance value of the strain resistive element changes. As a result, the strain resistive element performs an output according to an amount of displacement of the operation surface. The detection unit can thus correct the integrated value by the output of the strain resistive element. Therefore, the pressing detector can properly correct the integrated value at any timing.
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Citations
20 Claims
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1. A pressing detector, comprising:
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a piezoelectric element configured to generate an electric charge based on an amount of displacement of an operation surface; a displacement detection element configured to generate an output value based on the amount of the displacement of the operation surface; and a pressing detection unit configured to; calculate an integrated value of a voltage generated by the electric charge generated by the piezoelectric element, intermittently operate the displacement detection element, and correct the calculated and integrated value of the voltage based on the output value generated by the displacement detection element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A pressing detector, comprising:
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a piezoelectric element configured to generate an electric charge by a pressing of an operation surface; a resistive element having a resistance value that changes based on a pressing amount of the operation surface; and a pressing detection unit configured to; calculate an integrated value of a voltage generated by the electric charge generated by the piezoelectric element, intermittently operate the resistive element, and correct the calculated and integrated value of the voltage based on the resistance value of the resistive element. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An electronic device comprising:
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a housing; an operation unit disposed in the housing; and a pressing detector attached to an inner wall surface of the operation unit, the pressing detector comprising; a piezoelectric element configured to generate an electric charge based on an amount of displacement of an operation surface; a displacement detection element configured to generate an output value based on the amount of the displacement of the operation surface; and a pressing detection unit configured to; calculate an integrated value of a voltage generated by the electric charge generated by the piezoelectric element, intermittently operate the displacement detection element, and correct the calculated and integrated value of the voltage based on the output value generated by the displacement detection element. - View Dependent Claims (20)
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Specification