Surface acoustic wave device having a resinous film to cover an electrode pattern

摘要

An shear horizontal type surface acoustic wave device includes a piezoelectric substrate (2), an electrode pattern having at least one interdigital transducer (5) located on the piezoelectric substrate, and a resinous film (11) located on an entire area of a surface of the piezoelectric substrate except for a portion of a lead electrode (3c,4c) of the electrode pattern. The resinous film (11) is preferably formed by screen printing. The resinous film (11) includes a mixture of insulating powder having a specific gravity of not more than about 1.0, and a resin having a Shore hardness of not more than about 30.