Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1980-11-24
1982-10-26
Shoop, William M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310800, 310330, 361233, H01L 4122
Patent
active
043564240
ABSTRACT:
A body of polymeric piezoelectric material is nonuniformly poled by: applying an electric field across the thickness of the body, from one surface to another surface, of a strength sufficient to induce nonuniform polarization in the material; and reversing the polarity of the poling field, thereby increasing the nonuniformity. In a preferred embodiment, the material is poled at an elevated temperature; the poling field is of sufficient strength such that a portion of the body near one surface is polarized in one direction and a portion of the body near the other surface is polarized in a substantially opposite direction; and the polarity of the poling field is reversed a plurality of times.
A flexure element comprising a continuous body of polymeric piezoelectric material nonuniformly poled according to the method of the present invention, exhibits strong flexure response to applied fields. Novel elements produced according to the preferred embodiment of the present invention are characterized by having polarization in one direction near one surface of the body and polarization in the opposite direction near the opposite surface of the body.
REFERENCES:
patent: 2659829 (1953-11-01), Baerwald
patent: 3660736 (1972-05-01), Igarashi et al.
patent: 3832580 (1974-08-01), Yamamuro et al.
patent: 3950659 (1976-04-01), Dixon et al.
patent: 4089927 (1978-05-01), Taylor
patent: 4268653 (1981-05-01), Uchidol et al.
"Flexure Mode Piezoelectric Transducers", by C. P. Germano; IEEE Transactions on Audio and Electroacoustics, vol. AU-19, No. 1, Mar., 1971.
"Importance of the Metal-Polymer Interface for the Piezoelectricity of Polyvinylidene Fluoride", Journal of Polymer Science; by H. Sussner and K. Dransfield; Polymer Physics Edition, vol. 16, 529-543, 1978, John Wiley and Sons, Inc.
Close Thomas H.
Eastman Kodak Company
Shoop William M.
Wong Peter S.
LandOfFree
Pseudo-AC method of nonuniformly poling a body of polymeric piez does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pseudo-AC method of nonuniformly poling a body of polymeric piez, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pseudo-AC method of nonuniformly poling a body of polymeric piez will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-950365