Driving method for piezoelectric vibrator, and dust removing device and ultrasonic motor using the driving method
First Claim
1. A driving method for a piezoelectric vibrator comprising a driving piezoelectric element and a detection piezoelectric element formed of the same material as a material of the driving piezoelectric element the driving method comprising:
- calculating at least one of variations in mechanical resistance of the piezoelectric vibrator and variations in a piezoelectric characteristic of a piezoelectric element; and
applying an alternating voltage which is adjusted in accordance with the at least one of variations in mechanical resistance of the piezoelectric vibrator and the variations in the piezoelectric characteristic of the piezoelectric element, to thereby adjust an electrical input to the piezoelectric vibrator to suppress variations in vibration amplitude of the piezoelectric vibrator.
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Abstract
A driving method for a piezoelectric vibrator including a driving piezoelectric element and a detection piezoelectric element formed of the same material as a material of the driving piezoelectric element, for driving the piezoelectric vibrator by applying, to the driving piezoelectric element, an alternating voltage having a frequency close to a resonance frequency of the piezoelectric vibrator, the driving method including, in the case where it is detected based on variations in output detected from the detection piezoelectric element that at least one of variations in mechanical resistance of the piezoelectric vibrator and variations in piezoelectric characteristic of a piezoelectric element have occurred, applying an alternating voltage adjusted in accordance with the variations in mechanical resistance of the piezoelectric vibrator and/or the variations in piezoelectric characteristic of the piezoelectric element, to thereby adjust an electrical input to the piezoelectric vibrator to suppress variations in vibration amplitude of the piezoelectric vibrator.
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Citations
28 Claims
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1. A driving method for a piezoelectric vibrator comprising a driving piezoelectric element and a detection piezoelectric element formed of the same material as a material of the driving piezoelectric element the driving method comprising:
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calculating at least one of variations in mechanical resistance of the piezoelectric vibrator and variations in a piezoelectric characteristic of a piezoelectric element; and applying an alternating voltage which is adjusted in accordance with the at least one of variations in mechanical resistance of the piezoelectric vibrator and the variations in the piezoelectric characteristic of the piezoelectric element, to thereby adjust an electrical input to the piezoelectric vibrator to suppress variations in vibration amplitude of the piezoelectric vibrator. - View Dependent Claims (2, 3, 4, 5, 19, 22, 25)
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6. A driving method for a piezoelectric vibrator comprising a driving piezoelectric element, the driving method comprising;
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calculating at least one of variations in mechanical resistance of the piezoelectric vibrator and variations in a piezoelectric characteristic of a piezoelectric element; and applying an alternating voltage which is adjusted in accordance with the at least one of variations in mechanical resistance of the piezoelectric vibrator and the detected variations in the piezoelectric characteristic of the piezoelectric element, to thereby adjust an electrical input to the piezoelectric vibrator. - View Dependent Claims (7, 8, 9, 20, 23, 26)
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10. A driving method for a piezoelectric vibrator comprising a driving piezoelectric element, the driving method comprising:
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calculating a variation in mechanical resistance of the piezoelectric vibrator; and adjusting an input power to a magnitude expressed by the following expression based on the variation in mechanical resistance of the piezoelectric vibrator, to thereby adjust variations in vibration amplitude of the piezoelectric vibrator, - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 21, 24, 27, 28)
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Specification