Actuator which controls voltage level and voltage level increase

Details Actuator which controls voltage level and voltage level increase Actuator which controls voltage level and voltage level increase

1997-10-21

1999-02-09

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310323, 310321, 310329, H01L 4108

Patent

active

058699180

ABSTRACT:
An actuator which includes an electromechanical converting element having a first connection portion and a second connection portion, an inertia member connected to the first connection portion of the electromechanical converting element, and a moving member connected to the second connection portion of the electromechanical converting element. A drive signal control unit produces a drive signal having an asymmetric voltage waveform. The asymmetric voltage waveform has a voltage level increasing portion in which the voltage level of the asymmetric voltage waveform is increasing. The drive signal control unit controls the voltage level of the asymmetric voltage waveform during the voltage level increasing portion of the asymmetric voltage waveform, and applies the drive signal to the electromechanical converting element to generate an inertia force in the inertia member and cause the moving member to move. Alternatively, the drive signal control unit can control the amount of time of the voltage level increasing portion of the asymmetric voltage waveform, or the drive signal control unit can control both the voltage level and the amount of time of the voltage level increasing portion of the asymmetric voltage waveform.

REFERENCES:
patent: 4894579 (1990-01-01), Higuchi et al.

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