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 member 30 such as glass, a piezoelectric member 20 , interdigital transducers 11 interposed between the non-piezoelectric member 30 and the piezoelectric member 20 , and pre-pressurizing means 42 for pressing the piezoelectric member 20 onto the non-piezoelectric member 30 by way of the interdigital transducers. Alternating voltage is applied to the interdigital transducers 11 for exciting the surface acoustic wave on the non-piezoelectric member 30 . Standing waves are generated in the piezoelectric member 20 by applying alternating voltage to the interdigital transducers 11 , thereby allowing alternating strains to propagate to the non-piezoelectric member 30 such as a glass substrate or the like by way of the electrodes 11 and exciting the surface acoustic wave for making mechanical vibration of the non-piezoelectric member 30 available.
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