Energy translating devices

Claim 2

An acoustical device for translating a selected energy band and imparting it to an energy carrier of selected load characteristics comprising, a piezoelectric body having opposite faces and cut for operation in a thickness shear mode when excited over a frequency range, first electrode means on said body, second electrode means on said body, third electrode means on said body, said third electrode means bEing spaced from the other two of said electrode means whereby said third electrode means are acoustically coupled to each of said other electrode means, each of said electrode means having sufficient masses and being spaced sufficiently far from the electrode means to which it is coupled so that considering only said two-coupled electrode means there exists a real-image-impedance-frequency characteristic having a continuous portion starting at a zero value increasing to a maximum value and decreasing to zero value within a confined impedance range, said third electrode means having a short-circuited pair of opposing electrodes on opposite faces of said body, each of said electrode means including a pair of electrodes on opposite faces of said body, said shortcircuited one of said electrode means including a plurality of electrode pairs each on opposite faces of said body and each of said pairs being short circuited.

Claim 3

An acoustical device for translating a selected energy band and imparting it to an energy carrier of selected load characteristics comprising, a piezoelectric body having opposite faces and cut for operation in a thickness shear mode when excited over a frequency range, first electrode means on said body, second electrode means on said body, third electrode means on said body, said third electrode means being spaced from the other two of said electrode means whereby said third electrode means are acoustically coupled to each of said other electrode means, each of said electrode means having sufficient masses and being spaced sufficiently far from the electrode means to which it is coupled so that considering only said two-coupled electrode means there exists a real-image-impedance-frequency characteristic having a continuous portion starting at a zero value increasing to a maximum value and decreasing to zero value within a confined impedance range, said third electrode means having a short-circuited pair of opposing electrodes on opposite faces of said body, all of said pairs having sufficient masses and being spaced at such a distance from each other so as to be coupled to adjacent ones of said pairs with the same degree of coupling as exists between the coupled ones of said electrode means.

Claim 4

An acoustical device for translating a selected energy band and imparting it to an energy carrier of selected load characteristics comprising, a piezoelectric body having opposite faces and cut for operation in a thickness shear mode when excited over a frequency range, first electrode means on said body, second electrode means on said body, third electrode means on said body, said third electrode means being spaced from the other two of said electrode means whereby said third electrode means are acoustically coupled to each of said other electrode means, each of said electrode means having sufficient masses and being spaced sufficiently far from the electrode means to which it is coupled so that considering only said two-coupled electrode means there exists a real-image-impedance-frequency characteristic having a continuous portion starting at a zero value increasing to a maximum value and decreasing to zero value within a confined impedance range, said third electrode means having a short-circuited pair of opposing electrodes on opposite faces of said body, all of said pairs having sufficient masses and being spaced at such a distance from each other so as to be coupled to adjacent ones of said pairs with the same degree of coupling as exists between the coupled ones of said electrode means.

Claim 5

An acoustical device for translating a selected energy band and imparting it to an energy carrier of selected load characteristics comprising, a piezoelectric body having opposite faces and cut for operation in a thickness shear mode when excited over a frequency range, first electrode means on said body, second electrode means on said body, third electrode means on said body, said third electrode means being spaced from the other two of said electrode means whereby said third electrode means are acoustically coupled to each of said other electrode means, each of said electrode means having sufficient masses and being spaced sufficiently far from the electrode means to which it is coupled so that considering only said two-coupled electrode means there exists a real-image-impedance-frequency characteristic having a continuous portion starting at a zero value increasing to a maximum value and decreasing to zero value within a confined impedance range, said third electrode means having a short-circuited pair of opposing electrodes on opposite faces of said body, said third electrode means being a part of a plurality of pairs of electrodes all on opposing faces of said body and all having their respective electrodes short circuited.

Claim 6

An acoustical device for translating a selected energy band and imparting it to an energy carrier of selected load characteristics comprising, a piezoelectric body having opposite faces and cut for operation in a thickness shear mode when excited over a frequency range, first electrode means on said body, second electrode means on said body, third electrode means on said body, said third electrode means being spaced from the other two of said electrode means whereby said third electrode means are acoustically coupled to each of said other electrode means, each of said electrode means having sufficient masses and being spaced sufficiently far from the electrode means to which it is coupled so that considering only said two-coupled electrode means there exists a real-image-impedance-frequency characteristic having a continuous portion starting at a zero value increasing to a maximum value and decreasing to zero value within a confined impedance range, said third electrode means having a short-circuited pair of opposing electrodes on opposite faces of said body, said third electrode means being a part of a plurality of pairs of electrodes all on opposing faces of said body and all having their respective electrodes short circuited.

Claim 7

An acoustical device for translating a selected energy band and imparting it to an energy carrier of selected load characteristics comprising, a piezoelectric body having opposite faces and cut for operation in a thickness shear mode when excited over a frequency range, first electrode means on said body, second electrode means on said body, third electrode means on said body, said third electrode means being spaced from the other two of said electrode means whereby said third electrode means are acoustically coupled to each of sAid other electrode means, each of said electrode means having sufficient masses and being spaced sufficiently far from the electrode means to which it is coupled so that considering only said two-coupled electrode means there exists a real-image-impedance-frequency characteristic having a continuous portion starting at a zero value increasing to a maximum value and decreasing to zero value within a confined impedance range, said third electrode means having a short-circuited pair of opposing electrodes on opposite faces of said body, each of said electrode means including a pair of electrodes on opposite faces of said body, said short-circuited one of said electrode means including a plurality of electrode pairs, each on opposite faces on said body and each of said pairs being short circuited, said pairs having sufficient masses and being spaced from each other so as to be coupled to adjacent ones thereof with the same degree of coupling as exists between the coupled ones of said electrode means, said plurality of pairs of electrode means and said first and second pairs of electrode means being aligned along one axis of said body.

Claim 8

An acoustical device for translating a selected energy band and imparting it to an energy carrier of selected load characteristics comprising, a piezoelectric body having opposite faces and cut for operation in a thickness shear mode when excited over a frequency range, first electrode means on said body, second electrode means on said body, third electrode means on said body, said third electrode means being spaced from the other two of said electrode means whereby said third electrode means are acoustically coupled to each of sAid other electrode means, each of said electrode means having sufficient masses and being spaced sufficiently far from the electrode means to which it is coupled so that considering only said two-coupled electrode means there exists a real-image-impedance-frequency characteristic having a continuous portion starting at a zero value increasing to a maximum value and decreasing to zero value within a confined impedance range, said third electrode means having a short-circuited pair of opposing electrodes on opposite faces of said body, each of said electrode means including a pair of electrodes on opposite faces of said body, said short-circuited one of said electrode means including a plurality of electrode pairs, each on opposite faces on said body and each of said pairs being short circuited, said pairs having sufficient masses and being spaced from each other so as to be coupled to adjacent ones thereof with the same degree of coupling as exists between the coupled ones of said electrode means, said plurality of pairs of electrode means and said first and second pairs of electrode means being aligned along one axis of said body.

Claim 9

An acoustical device for translating a selected energy band and imparting it to an energy carrier of selected load characteristics comprising, a crystal body having opposite faces and cut for operation in a thickness shear mode, first electrode means on opposite faces of the crystal body, second electrode means on opposite faces of the crystal body, third electrode means on opposite faces of the crystal body, said electrode means being spaced from each other, said third electrode means being acoustically coupled to each of said other electrode means, said electrode means each having sufficient masses and being spaced sufficiently far from each other such that the coupling only between one electrode means and one other is such that there exists a zero-impedance-resonance to zero-impedance-resonance frequency bandwidth less than the antiresonant-to-resonant frequency range of either of the coupled electrode means, said electrode means having a short-circuited pair of electrodes on opposite faces of said body connected to the other.

Claim 10

An acoustical device for translating a selected energy band and imparting it to an energy carrier of selected load characteristics comprising, a crystal body having opposite faces and cut for operation in a thickness shear mode, first electrode means on opposite faces of the crystal body, second electrode means on opposite faces of the crystal body, third electrode means on opposite faces of the crystal body, said electrode means being spaced from each other, said third electrode means being acoustically coupled to each of said other electrode means, said electrode means each having sufficient masses and being spaced sufficiently far from each other such that the coupling only between one electrode means and one other is such that there exists a zero-impedance-resonance to zero-impedance-resonance frequency bandwidth less than the antiresonant-to-resonant frequency range of either of the coupled electrode means, said electrode means having a short-circuited pair of electrodes on opposite faces of said body connected to the other.

Claim 11

An acoustical device for translating a selected energy band and imparting it to an energy carrier of selected load characteristics comprising, a piezoelectric body having opposite faces and cut for operation in a thickness shear mode, first electrode means on opposite faces of said body, second electrode means on opposite faces of said body, third electrode means on opposite faces of said body, said electrode means being spaced from each other, said third electrode means being acoustically coupled to each of said other electrode means, said electrode means each having sufficient masses and being spaced sufficiently far from each other such that the coupling only between one electrode means and one other is such that there exists a zero-impedance-resonance to zero-impedance-resonance frequency bandwidth less than the antiresonant-to-resonant frequency range of either of the coupled electrode means, said electrode means having a short-circuited pair of electrodes on opposite faces of said body connected to the other, said electrode means having sufficient mass and being spaced so that the otherwise undisturbed coupling only between one electrode means and any other electrode means is such that there exists a zero-impedance-resonance to zero-impedance-resonance frequency bandwidth less than one-third the antiresonant-to-resonant frequency range of either of the coupled electrode means.

Claim 12

An acoustical device for translating a selected energy band and imparting it to an energy carrier of selected load characteristics comprising, a piezoelectric body having opposite faces and cut for operation in a thickness shear mode, first electrode means on opposite faces of said body, second electrode means on opposite faces of said body, third electrode means on opposite faces of said body, said electrode means being spaced from each other, said third electrode means being acoustically coupled to each of said other electrode means, said electrode means each having sufficient masses and being spaced sufficiently far from each other such that the coupling only between one electrode means and one other is such that there exists a zero-impedance-resonance to zero-impedance-resonance frequency bandwidth less than the antiresonant-to-resonant frequency range of either of the coupled electrode means, said electrode means having a short-circuited pair of electrodes on opposite faces of said body connected to the other, said electrode means having sufficient mass and being spaced so that the otherwise undisturbed coupling only between one electrode means and any other electrode means is such that there exists a zero-impedance-resonance to zero-impedance-resonance frequency bandwidth less than one-third the antiresonant-to-resonant frequency range of either of the coupled electrode means.