Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2011-01-25
2011-01-25
SanMartin, J. (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S344000
Reexamination Certificate
active
07876029
ABSTRACT:
A piezoelectric device includes: a piezoelectric resonator element; a package storing the piezoelectric resonator element therein in a manner to mount the piezoelectric resonator element on a base portion thereof composed of at least three layers that are layered; and a through hole penetrating through the base portion. In the device, the through hole includes a first hole formed on a first layer which is positioned to face the piezoelectric resonator element among the three layers; a second hole formed on a second layer contacting with the first layer; a third hole formed larger than the second hole on a third layer contacting with the second layer; and a metal coat formed on an inner wall surface of the second hole, and a sealing part for sealing the package is formed with a sealant in at least the second hole.
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Epson Toyocom Corporation
Oliff & Berridg,e PLC
SanMartin J.
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