Patent ID: 7154206
Filing Date: 2006-12-26
Classification: G01H,H01L,H03H,Y10T

Abstract:
1. A surface acoustic wave device comprising: a surface acoustic wave element including a piezoelectric substrate which includes one principal surface formed with an inter digital transducer electrode, a connector electrode connected to the inter digital transducer electrode and a periphery sealing electrode; and a base substrate formed with an electrode for connection to the element that is connected to the connector electrode, and a periphery sealing conductor film joined to the periphery sealing electrode; wherein the connector electrode and the electrode for connection to the element are joined together through a solder bump component, and the periphery sealing electrode and the periphery sealing conductor film are joined together through a solder sealing component between the base substrate and the surface acoustic wave element, the solder bump component and the solder sealing component comprise a Sn—Sb based or Sn—Ag based lead-free solder containing 90% or more Sn, and the base substrate has a thermal expansion coefficient of 9–20 ppm/° C.