Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2002-10-24
2008-09-30
Dougherty, Thomas M (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S348000
Reexamination Certificate
active
07429814
ABSTRACT:
The invention provides a piezoelectric resonator device having excellent frequency accuracy and aging characteristics. The piezoelectric resonator element can be packaged in an exclusive hollow space formed in the package in advance to packaging an IC chip. After mounting a lid on the opening of the hollow space while the hollow space is in communication with an external atmosphere, the external conduit is shut in vacuum and the hollow space for packaging the resonator element is tightly sealed, and an IC chip is packaged after an optimality discrimination treatment of the piezoelectric resonator element. The piezoelectric resonator element is formed into a tuning fork type resonator element, and the lid is made of a glass. The conduit to the external atmosphere is shielded by embedding with a gold base material to capture the materials scattered by frequency adjustment of the piezoelectric resonator element.
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Dougherty Thomas M
Oliff & Berridg,e PLC
Seiko Epson Corporation
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