Displacement amplification mechanism using piezoelectric element

Details Displacement amplification mechanism using piezoelectric element Displacement amplification mechanism using piezoelectric element

1992-04-24

1993-03-02

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

051912520

ABSTRACT:
The invention relates to a device using a leverage mechanism for amplifying a mechanical displacement produced by applying a voltage to a piezoelectric element. The device has a central support part, a pair of lever arms which are arranged oppositely and symmetrically with respect to a center axis of the support part and each connected to the support part by a hinge section, a piezoelectric element which has a longitudinal axis normal to the center axis of the support part and is fixed at two opposite ends to root ends of the two lever arms, respectively, and a resilient metal sheet beam which is fixed at its two oposite ends to the tip ends of two lever arms, respectively. A displacement of each end of the piezoelectric element is transmitted to the adjacent lever arm and amplified by lever action of each lever arm. As the amplified displacement is transmitted to the beam from the lever arms the beam makes a buckling motion, and a maximal displacement of the beam with respect to an end face of the support part becomes the output of the device. According to the invention a middle section of the beam is fixed to a protruding end of the support part, so that the device provides two simultaneous outputs one of which is a maximal displacement of the beam in a segment on one side of the fixed middle section and the other another maximal displacement in a segment on the opposite side of the middle section.

REFERENCES:
patent: 4675568 (1987-06-01), Uchikawa et al.
patent: 4706230 (1987-11-01), Inoue et al.
patent: 4783610 (1988-11-01), Asano
patent: 4874980 (1989-10-01), Mine et al.

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