Patent ID: 7418772

Claim:
A manufacturing method for a surface acoustic wave apparatus, comprising the steps of: preparing a piezoelectric substrate; forming a first insulating layer on the entirety of one surface of the piezoelectric substrate; forming a resist layer directly on said first insulation layer, said resist layer having a resist pattern for forming an electrode pattern including at least one electrode; removing, by using the resist pattern, at least a portion of the first insulating layer in an area in which said at least one electrode is to be formed directly on said piezoelectric substrate; maintaining a laminated structure of the first insulating layer and the resist pattern in an area other than the area in which said at least one electrode is to be formed; forming said at least one electrode by forming an electrode film directly on said piezoelectric substrate including at least one of a metal having a density higher than Aluminum and an alloy including a metal having a density higher than Aluminum in the area of the portion of the first insulating layer which was removed and said at least one electrode having a thickness substantially equal to a thickness of the first insulating layer while maintaining said laminated structure; removing the resist pattern on the first insulating layer; and forming a second insulating layer to cover and be in direct contact with the first insulating layer and said at least one electrode thereby producing said surface acoustic wave apparatus.