Crystal unit

Details Crystal unit Crystal unit

2006-10-31

2006-10-31

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S324000, C310S320000, C310S365000, C310S367000

Reexamination Certificate

active

07129624

ABSTRACT:
A crystal unit comprises an AT-cut crystal blank, and an excitation electrode formed on each of opposing main surfaces of the crystal blank in an oscillation region of the crystal blank. The ratio b/a is 0.014 or less, and preferably 0.012 or less where a represents the thickness of the crystal blank in the oscillation region and b represents the thickness of the excitation electrode. The thickness a is typically 5 μm or less.

REFERENCES:
patent: 3382381 (1968-05-01), Horton
patent: 3872411 (1975-03-01), Watanabe et al.
patent: 4306170 (1981-12-01), Motte et al.
patent: 6544478 (2003-04-01), Oyama et al.
patent: 6750593 (2004-06-01), Iwata
patent: 4-276914 (1992-10-01), None

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