| 摘要 |
PURPOSE:To conduct high density mounting even when an element, on which an active layer is not coated with resin, is used by a method wherein the flowing in of resin to the active surface of an elastic surface wave generating element is prevented by providing a dam on the circumference of the functional part of the title device. CONSTITUTION:Dams 3, made of polyimide resin and the like, are provided surrounding an elastic surface wave element 5 for the purpose of preventing the resin 71 from flowing away before hardening. Besides, the interdigital electrode of the elastic surface wave element 5 is prevented from being covered by the resin 7 with which the element is covered entirely. As a result, the interdigital electrode pattern 5a of the elastic surface wave element 5 and the wiring substrate 1 are facing each other, and dams 9 made of polyimide resin are provided on the wiring substrate 1 on the circumferential part in the cavity part 8 formed by bumps 6. The resin is prevented from flowing into the cavity part 8 before it is hardened by the above-mentioned dams.
|
