Quartz crystal unit

Details Quartz crystal unit Quartz crystal unit

2007-04-03

2007-04-03

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S367000, C310S368000, C310S320000

Reexamination Certificate

active

11170024

ABSTRACT:
A crystal unit for high frequency use includes: a crystal blank having a central portion that is used as a vibration region and a peripheral portion that surrounds the central portion and that is provided with a greater thickness than the central portion; a pair of excitation electrodes provided respectively on both major surface of the crystal blank in said vibration region; a pair of extending electrodes led out from the pair of excitation electrodes toward ends of the crystal blank, respectively; and an opposition region in which the extending electrodes overlap each other with the crystal blank interposed. Each of the extending electrodes connects to a corresponding excitation electrode over at least half of the outer circumference of the excitation electrode, and the thickness of the crystal blank is greater in the opposition region than in the vibration region.

REFERENCES:
patent: 3382381 (1968-05-01), Horton
patent: 3872411 (1975-03-01), Watanabe et al.
patent: 4656707 (1987-04-01), Berte et al.
patent: 6232699 (2001-05-01), Wajima
patent: 6525449 (2003-02-01), Wajima
patent: 2005/0110369 (2005-05-01), Onishi et al.
patent: 2004-040693 (2004-02-01), None
patent: 2004-072676 (2004-03-01), None

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