Force sensing device and sensor and piezoelectric element thereof
AssigneeNational Sun Yat-Sen University
InventorsYu-Jen Wang, Yu-Jan Lo, Ren-Yi Huang
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Abstract
A force sensing device is mounted on a tool to sense force, particularly quasi-static and static forces. The force sensing device includes at least one a sensor. A piezoelectric element in the sensor includes a driving portion and a sensing portion. A first voltage is input to the driving portion to generate a vibration in the piezoelectric element and a second voltage in response to the vibration is output from the sensing portion. The second voltage output from the sensing portion is changed as the vibration in the piezoelectric element is suppressed by an external force acting on the force sensing device so variation of the second voltage can be used to measure the external force.
Claims14
A force sensing device comprising:
- at least one upper base;
- a lower base;
- and
- at least one first sensor disposed between the at least one upper base and the lower base and including an upper casing and a piezoelectric element, the upper casing is configured to cover and contact the piezoelectric element and located between the at least one upper base and the piezoelectric element, the piezoelectric element includes a driving portion and a sensing portion, the driving portion is configured to be applied with a first voltage to generate a vibration in the piezoelectric element, the sensing portion is configured to sense the vibration transmitted from the driving portion to output a second voltage, wherein when an external force is applied to the upper base, the external force is transmitted from the at least one upper base and the upper casing to the piezoelectric element and configured to suppress the vibration in the piezoelectric element and change the second voltage output from the sensing portion such that the external force is configured to be measured using variation of the second voltage.
A sensor of force sensing device comprising:
- an upper casing;
- and
- a piezoelectric element including a driving portion and a sensing portion, the driving portion is configured to be applied with a first voltage to generate a vibration in the piezoelectric element, the sensing portion is configured to sense the vibration transmitted from the driving portion to output a second voltage, the upper casing is configured to cover and contact the piezoelectric element, wherein when an external force is applied to the upper casing, the external force is transmitted from the upper casing to the piezoelectric element and configured to suppress the vibration in the piezoelectric element and change the second voltage output from the sensing portion such that the external force is configured to be measured using variation of the second voltage.
A piezoelectric element of force sensing device comprising:
- a driving portion configured to be applied with a first voltage to generate a vibration in the piezoelectric element;
- and
- a sensing portion configured to sense the vibration transmitted from the driving portion to output a second voltage, wherein when an external force is applied to the piezoelectric element, the external force is configured to suppress the vibration in the piezoelectric element and change the second voltage output from the sensing portion such that the external force is configured to be measured using variation of the second voltage.
Dependencies are inferred from the claim text.