Tuning fork-type crystal vibrator

Details Tuning fork-type crystal vibrator Tuning fork-type crystal vibrator

2005-09-27

2005-09-27

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C333S200000

Reexamination Certificate

active

06949870

ABSTRACT:
A tuning fork-type crystal vibrator is provided that has improved CI and shock resistance. The tuning fork-type crystal vibrator includes a tuning fork-shaped crystal element made of a pair of tuning fork arms having grooves in their principal surfaces, and a tuning fork base portion from which the pair of tuning fork arms extends, an outer shape of the tuning fork-shaped crystal element being processed by etching. The tuning fork-type crystal vibrator has a protrusion, formed due to anisotropy of said etching, on a +X surface of the lateral faces of the tuning fork-shaped crystal element, and a first slanted portion rising from a −X direction in a +X direction formed in a tuning fork slit. A tip of the tuning fork slit on a principal surface side is shifted in +X direction from a center line bisecting the tuning fork-shaped crystal element in a width direction to a position at which tuning fork vibrations of the pair of tuning fork arms are balanced.

REFERENCES:
patent: 6806797 (2004-10-01), Kikushima
patent: 2002/0125794 (2002-09-01), Tanaya et al.
patent: 2003/0080652 (2003-05-01), Kawashima
patent: 2005/0040737 (2005-02-01), Tanaya
patent: 60140910 (1985-07-01), None
patent: 10206167 (1998-08-01), None
patent: 2000004138 (2000-01-01), None
patent: 2001208546 (2001-08-01), None

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