Piezoelectric laminate and method of manufacture

Details Piezoelectric laminate and method of manufacture Piezoelectric laminate and method of manufacture

1989-02-03

1991-07-30

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310363, 310364, 310311, H01L 4108

Patent

active

050362410

ABSTRACT:
A piezoelectric laminate comprises a piezoelectric layer and an insulating substrate layer rigidly bonded thereto. During poling, conditions are established under which a poling potential is established at the boundary of the layers which insures that a substantial part of the poling voltage is dropped across the piezoelectric layer. The poling voltage is maintained for a period greater than the time constant under the poling conditions of the material to which the poling voltage is applied. In one embodiment, the poling conditions are achieved by substantially enhancing the conductivity of the substrate layer relative to that of the piezoelectric layer. In a second embodiment, an intermediate bond layer is selectively switched from a non-conductive to a conductive state in response to a selected stimulus so as to form an electrode for facilitating the application of a poling field directly across the piezoelectric layer.

REFERENCES:
patent: 2956184 (1960-10-01), Pollack
patent: 3213027 (1965-10-01), Fatuzzo et al.
patent: 3240962 (1966-03-01), White
patent: 3912830 (1975-10-01), Murayama et al.
patent: 4109359 (1978-08-01), Cross et al.
patent: 4375042 (1983-02-01), Marcus
patent: 4533849 (1985-08-01), Schnell
patent: 4608509 (1986-08-01), Yamamoto et al.

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