Patent ID: 6426583
Filing Date: 2002-07-30
Classification: H03H,Y10T

Abstract:
A surface acoustic wave element comprising a laminated substrate where a first substrate made of a piezoelectric material is laminated over a second substrate made of a material different from that of the first substrate,comprising at least one pair of comb-shaped electrodes for exciting a surface acoustic wave, which is formed on one main plane of the first substrate, wherein a step or a notch is formed on a periphery of the laminated substrate on a side of the first substrate, the step or notch being formed from the first substrate into the second substrate, the second substrate has a thermal expansion coefficient smaller than a thermal expansion coefficient of the first substrate in a propagation direction of the surface acoustic wave, and a thickness of the first substrate is in a range of 5 &mgr;m to 100 &mgr;m, and a thickness of the second substrate is in a range of 200 &mgr;m to 400 &mgr;m.