Crystal unit

Details Crystal unit Crystal unit

2006-11-21

2006-11-21

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07138751

ABSTRACT:
A quartz crystal unit includes a casing body having a cavity defined therein and having an opening, a quartz crystal blank disposed in the cavity, and a metal cover closing the opening of the cavity and hermetically sealing the crystal blank in the cavity. The metal cover has a core made of Kovar, a barrier metal layer disposed on one principal surface of the core, and a brazing layer disposed on the barrier metal layer. The barrier metal layer is made of an alloy which is composed mainly of copper and which has a thermal expansion coefficient that is smaller than a thermal expansion coefficient of cupper. The metal cover is joined to a peripheral edge portion of the opening by the brazing layer. The barrier metal layer is preferably made of a copper-nickel alloy, and the brazing layer is preferably made of silver brazing material.

REFERENCES:
patent: 4405875 (1983-09-01), Nagai
patent: 5521438 (1996-05-01), Okamoto et al.
patent: 6833654 (2004-12-01), Rubach
patent: 2000-164746 (2000-06-01), None
patent: 2000-236035 (2000-08-01), None
patent: 2003-158211 (2003-05-01), None

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