| http://www.w3.org/ns/prov#value | - Each piezoelectric element 39 is connected to voltage application means, not shown, and undergoes volumetric changes and consequent changes in the thickness in the focussing direction on application of an electric voltage of the order of 100 V. The adjustment member 36, on the inner rim of which is inserted the backward lens holder 34, has its end and other end secured to the mounting portion 38 o
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