THERMALLY COMPENSATED PIEZOELECTRIC ASSEMBLY

摘要

Piezoelectric assembly, comprising a piezoelectric element (11) being capable of an electrically induced mechanical expansion in one dimension when supplied with a suitable electrical voltage, which piezoelectric element (11) is situated between a limiting element (141) and a piston element, which piston element is, by the electrically induced expansion of the piezoelectric element, movable relative to the limiting element (141); and further comprising a thermal compensation means compensating for relative changes in position between the piston element and the limiting element (141) due to a thermally induced expansion of the piezoelectric element (11) by means of an elastic element (12) mechanically buffering thermally induced expansions of the piezoelectric element (11); wherein a mechanical isolation means (15, 16, 17) for mechanically isolating the elastic element (12) during electrically induced expansions of the piezoelectric element (11).