Surface acoustic wave excitation device

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

Reexamination Certificate

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Details

C310S354000

Reexamination Certificate

active

11785290

ABSTRACT:
[Problems]To provide a surface acoustic wave excitation device for efficiently exciting the surface acoustic wave on the surface of a material such as glass having free size and shape for making mechanical vibration available.[Means to Solve the Problems]The surface acoustic wave excitation device according to the present invention comprises a non-piezoelectric member30such as glass, a piezoelectric member20, interdigital transducers11interposed between the non-piezoelectric member30and the piezoelectric member20, and pre-pressurizing means42for pressing the piezoelectric member20onto the non-piezoelectric member30by way of the interdigital transducers. Alternating voltage is applied to the interdigital transducers11for exciting the surface acoustic wave on the non-piezoelectric member30. Standing waves are generated in the piezoelectric member20by applying alternating voltage to the interdigital transducers11, thereby allowing alternating strains to propagate to the non-piezoelectric member30such as a glass substrate or the like by way of the electrodes11and exciting the surface acoustic wave for making mechanical vibration of the non-piezoelectric member30available.

REFERENCES:
patent: 4454440 (1984-06-01), Cullen
patent: 5323081 (1994-06-01), Hasleberg
patent: 7198981 (2007-04-01), Avramescu et al.
patent: 6-252684 (1994-09-01), None
patent: 2002-342016 (2002-11-01), None
patent: 2003-174351 (2003-06-01), None
patent: 2004-228689 (2004-08-01), None

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