Patent ID: 6310421
Filing Date: 2001-10-30
Classification: H01L,H03H

Abstract:
A surface acoustic wave device, comprising:a circuit substrate;a plurality of terminals formed on a surface of said circuit substrate;a piezoelectric substrate having a principal plane facing said surface of said circuit substrate;a functional portion formed on said principal plane of said piezoelectric substrate and which has driving electrodes for driving surface waves in a predetermined direction over a surface of said piezoelectric substrate;a plurality of bump electrodes formed on said principal plane of said piezoelectric substrate so as to be electrically connected to said functional portion, and projecting from said principal plane of said piezoelectric substrate to electrically contact said plurality of terminals;a first insulating film formed on said principal plane of said piezoelectric substrate except for areas over said functional portion and said bump electrodes;a second insulating film formed on said first insulating film except for areas over said bump electrodes, to thereby form a protective space over said functional portion; andan anisotropic conductor film formed between said circuit substrate and said second insulating film, said anisotropic conductor film extending over an area at least corresponding to said piezoelectric substrate and contacting said plurality of bump electrodes, said second insulating film, and said surface of said circuit substrate including said plurality of terminals.