Drive mechanism and drive method employing circuit for generating saw-tooth waveform voltage
First Claim
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1. A drive mechanism, comprising:
- an electromechanical transducer operating as a capacitor and having a pair of terminals;
an inductive element operating as an inductor and having a pair of terminals; and
a resistive element operating as a resistor and having a pair of terminals, wherein the electromechanical transducer, the inductive element and the resistive element are connected by terminals thereof in series so as to constitute a series resonance circuit, and wherein a voltage having a saw-tooth waveform applied to the electromechanical transducer causes the electromechanical transducer to expand at a first velocity and to contract at a second velocity, different from the first velocity.
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Abstract
An actuator using a piezoelectric element. The actuator includes: the piezoelectric element, which is capacitive; an inductor; and a resistor. The piezoelectric element, the inductor and the resistor are serially arranged so as to define a serial circuit. When a suitable voltage is supplied to the serial circuit, a saw-tooth waveform voltage is applied to the piezoelectric element so that the piezoelectric element extends at a speed and compresses at a different speed repeatedly.
54 Citations
19 Claims
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1. A drive mechanism, comprising:
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an electromechanical transducer operating as a capacitor and having a pair of terminals;
an inductive element operating as an inductor and having a pair of terminals; and
a resistive element operating as a resistor and having a pair of terminals, wherein the electromechanical transducer, the inductive element and the resistive element are connected by terminals thereof in series so as to constitute a series resonance circuit, and wherein a voltage having a saw-tooth waveform applied to the electromechanical transducer causes the electromechanical transducer to expand at a first velocity and to contract at a second velocity, different from the first velocity. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A driving method for running a drive mechanism which comprises:
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an electromechanical transducer operating as a capacitor and having a pair of terminals;
an inductive element operating as an inductor and having a pair of terminals; and
a resistive element operating as a resistor and having a pair of terminals, wherein the electromechanical transducer, the inductive element and the resistive element are connected by terminals thereof in series so as to constitute a series resonance circuit, the driving method comprising;
a first step of applying a voltage to the series resonance circuit so as to generate a voltage having a saw-tooth waveform applied to the electromechanical transducer; and
a second step of expanding the electromechanical transducer at a first velocity and contracting the electromechanical transducer at a second velocity, different from the first velocity, by the voltage having the saw-tooth waveform applied to the electromechanical transducer generated at the first step. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A circuit for generating a voltage having a saw-tooth waveform, comprising:
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an capacitance element operating as a capacitor and having a pair of terminals;
an inductive element operating as an inductor and having a pair of terminals; and
a resistive element operating as a resistor and having a pair of terminals, wherein the capacitance element, the inductive element and the resistive element are connected by terminals thereof in series so as to constitute a series resonance circuit, and wherein a voltage having a square waveform applied to the series resonance circuit generates the voltage having the saw-tooth waveform applied to the capacitance element. - View Dependent Claims (16, 17, 18, 19)
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Specification