リンク機構による変位の拡大と縮小

概要

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A planar linkage is described which was devised primarily for micropositioning stages. It functions both as a magnifying or reducing mechanism and a guidance system for a rectilinear motion. Two input bars, which are coupled to a driving element such as a piezoelectric stack, two output bars, one of which is mounted on a base plate and the other performs the function of a moving platform, and four connecting bars, eight bars in total are connected together by flexure pivots. A displacement amplification or reduction is effected according as the angle between the input and connecting bars is larger or less than 45°. Design formulae are given for the linearity between the input and output displacements and a decrease in magnification caused by an elongation of the flexure pivot. A differential linkage, which combines a pair of linkages, is presented for improving the linearity. Description of the experiments performed for evaluating the validity of design formulae, is included.
社団法人精密工学会の論文
1990-10-05