Metal working – Piezoelectric device making
Reexamination Certificate
2011-05-31
2011-05-31
Tugbang, A. Dexter (Department: 3729)
Metal working
Piezoelectric device making
C029S594000, C029S896220, C216S041000, C310S312000, C310S31300R, C310S370000
Reexamination Certificate
active
07950120
ABSTRACT:
To provide a method for manufacturing a piezoelectric resonator which can conduct frequency matching with high reliability when performing rough adjustment of the frequency by adjusting the shape of a piezoelectric oscillating piece before forming an electrode film, and thereby it becomes possible to avoid reduction of the yield. Etching for forming the shape of a piezoelectric oscillating piece, and etching for forming grooves are conducted simultaneously, and after forming the grooves, the shape formation of the piezoelectric oscillating piece is started again from the same depth as the groove in a state of covering the groove with a metal film, and after the shape formation, matching of frequency is conducted by etching the side surface of the piezoelectric oscillating piece in succession. By composing such a structure, it is possible to conduct rough adjustment of frequency at a low etching rate so that the frequency matching can be performed with no due difficulty and with high accuracy.
REFERENCES:
patent: 6959472 (2005-11-01), Kawashima
patent: 55046636 (1980-04-01), None
patent: 2002-76806 (2002-03-01), None
Jordan and Hamburg LLP.
Nihon Dempa Kogyo Co. Ltd.
Tugbang A. Dexter
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