Piezoelectric ceramic transformer being driven with thickness ex

Details Piezoelectric ceramic transformer being driven with thickness ex Piezoelectric ceramic transformer being driven with thickness ex

1992-04-01

1993-08-31

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310328, 310366, H01L 4108

Patent

active

052412369

ABSTRACT:
A piezoelectric ceramic transformer comprises a low impedance portion 11 including a plurality of piezoelectric ceramic layers 111 to 115 having different thicknesses, a high impedance portion 12 and internal electrodes 16. The low and high impedance portions 11 and 12 are subjected to a uniform polarization treatment in a thickness direction and with the same vector of polarization. The low impedance portion 11 includes one or more piezoelectric ceramic layers having a thickness different from those of the other layers therein. No delamination of electrodes or breaking of ceramics occur upon polarization treatment. Therefore, a compact piezoelectric ceramic transformer for power source which has a high mechanical quality coefficient Qm and a high electric power transmission efficiency is provided.

REFERENCES:
patent: 3487239 (1969-12-01), Schafft
patent: 3489931 (1970-01-01), Teaford
patent: 3590287 (1971-06-01), Berlincourt et al.
patent: 4564782 (1986-01-01), Ogawa
patent: 5118982 (1992-06-01), Inoue et al.

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