Metal working – Piezoelectric device making
Patent
1979-04-16
1980-08-19
Hall, Carl E.
Metal working
Piezoelectric device making
29841, 29840, 29843, 310334, H01L 4122
Patent
active
042176840
ABSTRACT:
A slab of piezoelectric ceramic plated on all surfaces is bonded to quarter wavelength impedance matching layers of glass and plastic. The top surface of the ceramic is slotted and parallel cuts orthogonal to the slots are made through the ceramic and into the glass to delineate an array of elements each with a signal electrode between slots and a wrap-around ground electrode. After making ground connections and flying lead connections to the signal electrodes, the matching layers are fully cut through from the front. A covering or wear plate is attached to the front surface and a relatively large mass of acoustic damping material covers the backs of the elements.
REFERENCES:
patent: 3952387 (1976-04-01), Iinuma et al.
patent: 4101795 (1978-07-01), Fukomoto et al.
patent: 4118649 (1978-10-01), Shwartzman et al.
"Multilayer Impedance Matching Schemes For Broadbanding of Water Loaded Pietoelectric Transducers", J. H. Goll et al., IEE Transactions on Sonics and Ultrasonics, vol. SU-22, No. 1, Jan. 1975, pp. 52-53.
"Highly Efficient Transducer Arrays Useful in Nondestructive Testing Applications", C. S. Desilets et al., 1978 Ultrasonic Symposium Proceedings.
Brisken Axel F.
Smith Lowell S.
Campbell Donald R.
Davis James C.
General Electric Company
Hall Carl E.
Snyder Marvin
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