Apparatus for effecting fine movement by impact force produced b

Details Apparatus for effecting fine movement by impact force produced b Apparatus for effecting fine movement by impact force produced b

1988-05-23

1990-01-16

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

048945790

ABSTRACT:
An apparatus for effecting a fine movement of an object for making use of impact produced by a piezoelectric/electrostrictive element having a moving member, a piezoelectric/electrostrictive element attached to said moving member, means for driving the piezoelectric/electrostrictive element, and an inertia member operative in response to the driving of the piezoelectric/electrostrictive element so as to impart an impact to the moving member. As an electric field is applied to the piezoelectric/electrostrictive element, a strain is caused by a stress which acts to expand or contract the piezoelectric/electrostrictive element to a length determined by the level of the electric field. By making use of this phenomenon, impact is produced by the inertia member which operates in response to the stress, thereby effecting a step-like fine movement of the moving member. Thus, the inertia member is impactingly driven by elongation or contraction of the piezoelectric/electrostrictive element so that a reactional force overcomes the friction acting between the moving member and a base so as to realize a fine movement of the moving member.

REFERENCES:
patent: 3808488 (1974-04-01), Massa
patent: 4195243 (1980-03-01), Thaxter
patent: 4523120 (1985-06-01), Assard et al.
patent: 4678955 (1987-07-01), Toda
patent: 4686440 (1987-08-01), Hatamura
IEEE, 1987, Micro Robots and Teleoperators workshop.
10th World Congress on Automatic Control Preprints.

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