Patent ID: 9541657
Date: 2017-01-10
CPC Classifications: G01V,H01L

Claim:
1. A bender bar, comprising: an inert element having a length, width and thickness, the inert element further having a first side and a second side; a first pair of piezoelectric elements, wherein one of the first pair of piezeoelectric elements is bonded to the first side and one of the first pair of piezoelectric elements is bonded to the second side; a second pair of piezoelectric elements, wherein each of the piezoelectric elements of the second pair are bonded to one of the piezoelectric elements of the first pair; wherein one of the piezoelectric elements of the second pair is bonded to the first side of the inert element in relation to one of the first pair in such a way that a first gap is formed between the piezoelectric element of the first pair and the piezoelectric element of the second pair; wherein one of the piezoelectric elements of the second pair is bonded to the second side of the inert element in relation to one of the first pair in such a way that a second gap is formed between the piezoelectric element of the first pair and the piezoelectric element of the second pair; a third pair of piezoelectric elements, each of the third pair of piezoelectric elements being bonded to one of the first pair of piezoelectric elements; a fourth pair of piezoelectric elements, each of the fourth pair of piezoelectric elements being bonded to one of the second pair of piezoelectric elements such that the first gap and the second gap are maintained; a driver circuit coupled to each pair of piezoelectric elements to independently drive each of the pair; wherein the first pair of piezoelectric elements are bars of width less than or equal to the width of the inert element and a length less than or equal to the length of the inert element; and wherein the second pair of piezoelectric elements are bars of width less than or equal to the width of the piezoelectric elements of the first pair and length less than the length of the piezoelectric elements of the first pair.