Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1993-03-10
1995-01-10
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310359, 310326, 12866001, H01L 4108
Patent
active
053810678
ABSTRACT:
A two-dimensional ultrasonic transducer array includes a plurality of transducer elements, with each element having a plurality of piezoelectric layers. The transducer elements vary in transverse areas of radiating regions. The effect of the variations in transverse areas on the electrical impedances of the elements is at least partially offset by varying the specific impedance, i.e., impedance per unit area, of the transducer elements in the array. In a preferred embodiment, the specific impedance is varied by selecting the electrical arrangements of piezoelectric layers in each element according to the transverse area of the element. Series, parallel and series-parallel arrangements are employed. This impedance normalization improves the electrical connection of the transducer elements to driving circuitry. In alternative embodiments, impedance normalization is achieved by varying element thicknesses, element materials and/or degrees of poling across the two-dimensional array.
REFERENCES:
patent: 2411551 (1946-11-01), Mason
patent: 2928068 (1960-03-01), Samsel et al.
patent: 3922572 (1975-11-01), Cook et al.
patent: 3939467 (1976-02-01), Cook et al.
patent: 4087716 (1978-05-01), Heywang
patent: 4096756 (1978-06-01), Alphonse
patent: 4240003 (1980-12-01), Larson, III
patent: 4398116 (1983-08-01), Lewis
patent: 4460841 (1984-07-01), Smith et al.
patent: 4477783 (1984-10-01), Glenn
patent: 4518889 (1985-05-01), Hoen
patent: 4714846 (1987-12-01), Pesque et al.
patent: 4825115 (1989-04-01), Kawabe et al.
patent: 4841494 (1989-06-01), Banno
patent: 4890268 (1989-12-01), Smith et al.
patent: 4939826 (1990-07-01), Shoup
patent: 4985926 (1991-01-01), Foster
patent: 5015929 (1991-05-01), Cathignol et al.
patent: 5099459 (1992-03-01), Smith
patent: 5259099 (1993-11-01), Banno et al.
Greenstein Michael
Melton, Jr. Hewlett E.
Budd Mark O.
Hewlett--Packard Company
LandOfFree
Electrical impedance normalization for an ultrasonic transducer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrical impedance normalization for an ultrasonic transducer , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrical impedance normalization for an ultrasonic transducer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-853401