Patent ID: 6433654
Filing Date: 2002-08-13
Classification: H03H

Abstract:
A laminated piezoelectric component comprising:a plurality of piezoelectric substrates having vibration electrodes disposed on a surface thereof; a plurality of cover substrates arranged in a stack with the plurality of piezoelectric substrates so as to define a laminated body together with the piezoelectric substrates; and adhesives located between the piezoelectric substrates and the cover substrates so as to bond the piezoelectric substrates to the cover substrates; wherein an elasticity modulus and thickness of the adhesives are determined so that a change of the resonance frequency, caused by heat applied to the piezoelectric substrate is canceled by a change of the resonance frequency caused by a synthesized stress that is imparted to the piezoelectric substrate from the cover substrates and adhesives; and the value calculated by the following equation is approximately zero: a2Ã—b2âˆ’a3Ã—b3âˆ’a1Ã—b1Ã—exp[âˆ’(b2/c2)Ã—107]where a1 (/Â°C.) and be (&mgr;m) denote the thermal expansion coefficient and thickness of the cover substrates, respectively, a2 (/Â°C.), b2 (&mgr;m) and c (MPa) denote the thermal expansion coefficient, thickness and elasticity modulus of the adhesives, respectively, and a3 (/Â°C.) and b3 (&mgr;m) denote the thermal expansion coefficient and thickness of the piezoelectric substrates.