Method of forming integral transducer and impedance matching lay

Details Method of forming integral transducer and impedance matching lay Method of forming integral transducer and impedance matching lay

1994-10-21

1996-09-03

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

367152, 367155, 367157, 310320, 12866203, H04R 1700

Patent

active

055530354

ABSTRACT:
A method of forming a transducer device having integral transducer and impedance matching portions includes forming grooves partially through a thickness of a piezoelectric member. A groove volume fraction at the impedance matching portion controls the electrical impedance. The impedance matching portion may be at either or both of the front and rear surfaces of the transducer portion, which generates acoustic wave energy in response to application of a drive signal. The drive signal is introduced by electrodes. In one embodiment, the electrode at the impedance matching portion extends into the grooves, but preferably a filler material is selected and deposited to allow use of a planar electrode. An alternative embodiment to fabricating the transducer device is to assemble piezoelectric material. For example, an integral transducer and impedance matching portions may be formed by using molding techniques or by stacking dimensionally different thin piezoelectric layers. The acoustic impedance of the matching layer can be varied spatially to provide apodization of a radiating aperture. Moreover, a graded impedance matching layer can be formed, resulting in a tapered variation in the acoustic impedance of the matching layer.

REFERENCES:
patent: 4939826 (1990-07-01), Shoup
patent: 5434827 (1995-07-01), Bolorforosh
Newnham, R. E., et al., "Connectivity and Piezoelectric-Pyroelectric Composites," Materials Research Bulletin, vol. 13, 1978, pp. 525-536, Pergamon Press, Inc.
Oakley, Clyde, et al., "Development of 1-3 ceramic-air composite transducers," SPIE, vol. 1733, 1992, pp. 274-283.
Smith, Wallace Arden, "New opportunities in ultrasonic transducers emerging from innovations in piezoelectric materials," SPIE, vol. 1733, 1992, pp. 3-26.
Smith, Wallace Arden, "Modeling 1-3 Composite Piezoelectrics: Thickness-Mode Oscillations," IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 38, No. 1, Jan. 1991, pp. 40-47.

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