Quartz crystal device

Details Quartz crystal device Quartz crystal device

2008-09-05

2010-06-29

Dougherty, Thomas M (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S348000, C310S349000, C310S361000

Reexamination Certificate

active

07745978

ABSTRACT:
A quartz crystal device includes: a quartz crystal blank having an outer perimeter part and a vibration region partially separated mechanically from the outer perimeter part by a cut-out groove; a first container joined to a first principal surface of the crystal blank by being joined to an entire perimeter of the perimeter part of the crystal blank via a brazing material layer in the first principal surface; and a second container joined to a second principal surface of the crystal blank by being joined to an entire perimeter of the outer perimeter part of the crystal blank via a brazing material layer in the second principal surface. The vibration region of the crystal blank is hermetically encapsulated in a space formed by the first container, the second container and the outer perimeter part of the crystal blank.

REFERENCES:
patent: 4293986 (1981-10-01), Kobayashi et al.
patent: 4362961 (1982-12-01), Gerber
patent: 4451754 (1984-05-01), Stolz et al.
patent: 5449965 (1995-09-01), Tsuru
patent: 5596243 (1997-01-01), Tsuru et al.
patent: 6606772 (2003-08-01), Nohara et al.
patent: 9-326663 (1997-12-01), None

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