Piezoelectric resonator element, piezoelectric device and...

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

Reexamination Certificate

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C310S317000, C310S321000, C333S200000, C073S504020, C331S156000

Reexamination Certificate

active

07397172

ABSTRACT:
A piezoelectric resonator element, comprises: a base made of a piezoelectric material; at least a pair of resonating arms provided in a unified manner with the base and extending in parallel with each other from the base; a portion defining a long groove provided to each of the resonating arms along a longitudinal direction; and a driving electrode provided to the long groove. Each of the resonating arms includes a structure to adjust hardness balance between right and left structures with respect to a virtual central line extending in the longitudinal direction.

REFERENCES:
patent: 2004/0085163 (2004-05-01), Kikushima
patent: 2006/0066185 (2006-03-01), Tanaya
patent: 0 821 481 (1998-01-01), None
patent: 57-60718 (1982-04-01), None
patent: 57060718 (1982-04-01), None
patent: 57-199314 (1982-12-01), None
patent: 2002-076806 (2002-03-01), None
patent: 2003-207338 (2003-07-01), None
patent: 2004-236008 (2004-08-01), None
patent: 2004-245605 (2004-09-01), None
Communication from European Patent Office regarding related application.

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