Method for making piezoelectric composites
First Claim
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1. A method for making a piezoelectric composite from two or more pieces of piezoelectric or electrostrictive material comprising the steps of:
- forming two structures each comprised of piezoelectric elements of width W separated by a gap distance K on a pitch spacing P;
interdigitating the two structures, the elements of one structure being interdigitated with the elements of the other structure;
joining the interdigitated elements to form a composite suitable for use in an acoustic transducer;
removing those portions of piezoelectric material of each structure that interconnect the ends of elements;
then coating the opposite surfaces of the composite to interconnect the elements with an electrically conductive layer.
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Abstract
A method is described for making a piezoelectric composite for building an acoustic transducer from two or more pieces of piezoelectric material. Each piece of material is cut to form slots or trenches having a uniform pitch spacing and material portions of uniform width such that the material portions of one piece may be received within the slots or trenches of the other. The pieces are then interdigitated and joined to make the piezoelectric composite.
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Citations
18 Claims
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1. A method for making a piezoelectric composite from two or more pieces of piezoelectric or electrostrictive material comprising the steps of:
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forming two structures each comprised of piezoelectric elements of width W separated by a gap distance K on a pitch spacing P; interdigitating the two structures, the elements of one structure being interdigitated with the elements of the other structure; joining the interdigitated elements to form a composite suitable for use in an acoustic transducer; removing those portions of piezoelectric material of each structure that interconnect the ends of elements; then coating the opposite surfaces of the composite to interconnect the elements with an electrically conductive layer. - View Dependent Claims (2, 3, 4)
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5. A method for making a composite piezoelectric device from two or more pieces of piezoelectric and/or electrostrictive material comprising the steps of:
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cutting each of two pieces of material to form slots, trenches or through-cuts therein, said slots, trenches or cuts separating two or more portions of each piece by a gap distance K, said slots, trenches or cuts being formed on a pitch-spacing P and forming material portions or elements of width W such that the two pieces of material may be interdigitated; interdigitating the two pieces of material, the material portion of one piece being received in the slots, trenches or cuts of the second piece and vice versa; joining the two interdigitated pieces to form a composite device; removing those portions of piezoelectric material of each structure that interconnect the end of elements; then coating the opposite surfaces of the composite to interconnect the elements with an electrically conductive layer. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for making a composite piezoelectric device from two or more slabs or piezoelectric material, each slab at least initially having a substantially planar surface, and comprising the steps of:
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forming a plurality of parallel slots, trenches, or through-cuts in the surface of each slab, said slots, trenches or through-cuts being formed on a pitch spacing P and defining therebetween material portions or elements of width W, each slot, trench or through-cut separating adjacent element portions by a gap distance K such that the material portions of the two slabs may be interdigitated; interdigitating the two slabs, the portions of one slab being received int he slots, trenches or through-cuts of the second slab and vice versa; joining the two slabs to form a composite device; removing those portions of piezoelectric material of each structure that interconnect the ends of elements; then coating the opposite surfaces of the composite to interconnect the elements with an electrically conductive layer. - View Dependent Claims (16, 17, 18)
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Specification