| http://www.w3.org/ns/prov#value | - FIG. 7 is a graph wherein the abscissa represents the ratio R/t2 of the radius R of curvature of a side corner portion of the insulating block 21 to the thickness t2 of the piezoelectric layer 13, and the ordinate represents the ratio (relative maximum electric field) to a maximum electric field value of when a maximum electric field value R generated in the piezoelectric layer 13 is 0.
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