| 摘要 |
PURPOSE:To achieve a Lamb wave device excellent in temperature characteristic, by the selection that the relation between the standard thickness and cut-azimuth of a crystal rotating Y plate can satisfy the specified conditions. CONSTITUTION:Crossing finger electrode transducers 11, 12 are provided on a rotating Y-cut plate. When the plate thickness of the rotating Y-cut plate is thick, since the Lamb wave is excited for the front and back of the plate, the sadjustment of frequency can be made easy by providing an electrode film 13 at the back sides opposing to the transducers 11, 12, respectively. The Lamb wave device excellent in temperature characteristic having the zero temperature coefficient near room temperature can be obtained by selecting the standard plate thickness of the rotating Y plate, T=h/DELTA (where: eta is plate thickness and LAMBDA is the wavelength of Lamb wave), cut-azimuth so that the relation of Equation 1 can be satisfied. |
