Crystal unit

Details Crystal unit Crystal unit

2006-03-14

2006-03-14

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S320000, C310S324000, C310S360000, C310S365000, C310S367000, C310S368000

Reexamination Certificate

active

07012355

ABSTRACT:
A crystal unit has a crystal blank having a hole defined in at least one principal surface thereof, the crystal blank having a region of a reduced thickness including the hole, the region serving as a vibrating region, excitation electrodes disposed respectively on opposite principal surfaces of the crystal blank in the vibrating region, extension electrodes extending respectively from the excitation electrodes to respective opposite ends of one side of the crystal blank, and a casing having a step formed therein. The opposite ends of the one side of the crystal blank are fixed to the step by a joining member. The crystal blank has a notched portion defined therein between the one side and the vibrating region, the notched portion extending from at least one transverse edge of the crystal blank in a transverse direction of the crystal blank.

REFERENCES:
patent: 2161980 (1939-06-01), Runge et al.
patent: 5376861 (1994-12-01), Nakamura et al.
patent: 5481154 (1996-01-01), Kaida
patent: 5841217 (1998-11-01), Kizaki et al.
patent: 53-132988 (1978-09-01), None
patent: 4-196613 (1992-07-01), None
patent: 8-162875 (1996-06-01), None

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