High impedance transducer

Claim 2

An array of discrete electromechanical transducer elements adapted to convert microwave energy into ultrasonic elastic wave energy, and vice versa, said array being formed of a single body layer of piezoelectric material elastically coupling said transducer elements, said transducer elements being in the form of spaced portions in said layer of piezoelectric material between electrode means in juxtaposed relation to the respective opposite sides of said piezoelectric layer, said electrodes being so configured in relation to each other that only spaced portions of said electrode means which are aligned transversely of said array are in juxtaposed relation to the opposite respective sides of said piezoelectric layer to form said discrete transducer elements and thereby reduce the total capacitance of said array.

Claim 3

In a delay line, the combination comprising a. an ultrasonic transmission medium forming part of, b. an array of discrete electromechanical transducing elements, said array of electromechanical transducer elements including a single body layer of piezoelectric material constituting said transmission medium elastically coupling said transducer elements, said transducer elements being in the form of spaced portions in said layer of piezoelectric material between electrode means in juxtaposed relation to the respective opposite sides of said piezoelectric layer, said electrodes being so configured in relation to each other that only spaced portions of said electrode means which are aligned transversely of said array are in juxtaposed relation to the opposite respective sides of said piezoelectric layer to form said discrete transducer elements and thereby reduce the total capacitance of said array.

Claim 4

In a delay line, the combination comprising a. an ultrasonic transmission medium forming part of, b. an array of discrete electromechanical transducing elements, said array of electromechanical transducer elements including a single body layer of piezoelectric material constituting said transmission medium elastically coupling said transducer elements, said transducer elements being in the form of spaced portions in said layer of piezoelectric material between electrode means in juxtaposed relation to the respective opposite sides of said piezoelectric layer, said electrodes being so configured in relation to each other that only spaced portions of said electrode means which are aligned transversely of said array are in juxtaposed relation to the opposite respective sides of said piezoelectric layer to form said discrete transducer elements and thereby reduce the total capacitance of said array.

Claim 5

In a delay line, the combination comprising a. an ultrasonic transmission medium, b. a first electrode structure in contact with said medium and having a plurality of raised portions thereon, c. a layer of piezoelectric material overlying said first electrode structure and said raised portions thereof, and d. a second electrode structure in contact with said piezoelectric material solely in the areas in which said raised portions of said first electrode structure underlie said piezoelectric material, the arrangement being such that only predetermined regions of said piezoelectric material have oppositely electroded areas with said predetermined regions defining an array of discrete electromechanical transducing elements.

Claim 6

In a delay line, the combination comprising a. an ultrasonic transmission medium, b. a first electrode structure in contact with said medium and having a plurality of raised portions thereon, c. a layer of piezoelectric material overlying said first electrode structure and said raised portions thereof, and d. a second electrode structure in contact with said piezoelectric material solely in the areas in which said raised portions of said first electrode structure underlie said piezoelectric material, the arrangement being such that only predetermined regions of said piezoelectric material have oppositely electroded areas with said predetermined regions defining an array of discrete electromechanical transducing elements.

Claim 7

In a delay line, the combination comprising a. an ultrasonic transmission medium, b. a first electrode structure in contact with said medium, c. a layer of piezoelectric material overlying said first electrode structure, and d. a second electrode structure having a plurality of raised portions, said raised portions only of said second electrode structure being in contact with predetermined areas of said layer of piezoelectric material such that only predetermined regions of said layer have oppositely electroded areas, said oppositely electroded predetermined regions defining an array of discrete electromechanical transducing elements.

Claim 8

In a delay line, the combination comprising a. an ultrasonic transmission medium, b. a first electrode structure in contact with said medium, c. a layer of piezoelectric material overlying said first electrode structure, and d. a second electrode structure having a plurality of raised portions, said raised portions only of said second electrode structure being in contact with predetermined areas of said layer of piezoelectric material such that only predetermined regions of said layer have oppositely electroded areas, said oppositely electroded predetermined regions defining an array of discrete electromechanical transducing elements.

Claim 9

In a delay line, the combination comprising a. an ultrasonic transmission medium, b. a first electrode structure in contact with said medium, said first electrode structure having a plurality of spaced apart parallel portions which are interconnected at at least one end by a terminal base portion, c. a layer of piezoelectric material overlying said first electrode structure, and d. a second electrode structure in contact with said layer of piezoelectric material, said second electrode structure having a plurality of spaced apart paralleL portions which are interconnected at one end by a terminal base portion, said second electrode structure being positioned on said layer of piezoelectric material with the plurality of spaced parallel portions thereof being orthogonally disposed with respect to the plurality of spaced parallel portions of said first electrode structure such that only predetermined regions of said layer of piezoelectric material have oppositely electroded areas, said oppositely electroded predetermined regions defining an array of discrete electromechanical transducing elements.

Claim 10

In a delay line, the combination comprising a. an ultrasonic transmission medium, b. a first electrode structure in contact with said medium, said first electrode structure having a plurality of spaced apart parallel portions which are interconnected at at least one end by a terminal base portion, c. a layer of piezoelectric material overlying said first electrode structure, and d. a second electrode structure in contact with said layer of piezoelectric material, said second electrode structure having a plurality of spaced apart paralleL portions which are interconnected at one end by a terminal base portion, said second electrode structure being positioned on said layer of piezoelectric material with the plurality of spaced parallel portions thereof being orthogonally disposed with respect to the plurality of spaced parallel portions of said first electrode structure such that only predetermined regions of said layer of piezoelectric material have oppositely electroded areas, said oppositely electroded predetermined regions defining an array of discrete electromechanical transducing elements.

Claim 11

The array as set forth in claim 1 in which said transformer elements are spaced from each other by a distance equal to approximately one-half wavelength of the acoustic wavelength in said medium.