Piezoelectric substrate for a saw device

Details Piezoelectric substrate for a saw device Piezoelectric substrate for a saw device

2007-01-17

2008-08-05

Dougherty, Thomas M (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S31300R

Reexamination Certificate

active

07408286

ABSTRACT:
The present invention provides a composite structure having a supporting substrate between a piezoelectric substrate and a compensation layer. The materials used to form the piezoelectric substrate and the compensation layer in isolation, have higher thermal coefficients of expansion (TCE) relative to the TCE of the materials forming the supporting substrate. Once the composite structure is created, the piezoelectric substrate and compensation layer tend to expand and contract in a similar manner as temperature changes. The expansion and contraction forces applied to the supporting substrate by the piezoelectric substrate due to temperature changes are substantially countered by similar opposing forces applied by the compensation layer, resulting in the opposing forces substantially counteracting one another. Due to the counteraction, the composite structure resists bending or warping, reducing expansion and contraction and increasing stress of the piezoelectric substrate, and thus reducing the effective TCE and TCF of the piezoelectric substrate.

REFERENCES:
patent: 6313568 (2001-11-01), Sullivan et al.
patent: 6420820 (2002-07-01), Larson, III
patent: 6441539 (2002-08-01), Kitamura et al.
patent: 7126259 (2006-10-01), Moler et al.
patent: 2006/0186556 (2006-08-01), Sung
patent: 2007/0296306 (2007-12-01), Hauser et al.

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