Tuning fork flexural crystal vibration device, crystal...

Details Tuning fork flexural crystal vibration device, crystal... Tuning fork flexural crystal vibration device, crystal...

2008-03-27

2010-12-14

Dougherty, Thomas M (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S344000, C310S348000

Reexamination Certificate

active

07851980

ABSTRACT:
A tuning fork flexural crystal vibration device includes a base, two vibration arms, grooves, electrodes, and wirings. The base has a flat plate shape. The two vibration arms have flat panel shapes extending from a side surface of the base in the same direction. The grooves are provided for the two vibration arms so as to extend from base-side end portions of the vibration arms along the longitudinal direction of the vibration arms and are depressed in the thickness direction of the vibration arms. The grooves include front-side grooves which open in the front main surfaces of the vibration arms and are provided at least one by one for each vibration arm, and rear-side grooves which open in the rear main surfaces of the vibration arms and are provided at least one by one for each vibration arm. The bottom surface of the front-side groove does not face the bottom surface of the rear-side groove provided in the same vibration arm in which the front-side groove is provided. The electrodes are formed on the surfaces of the base and the two vibration arms. The wirings electrically connect the electrodes to each other. A crystal vibrator and crystal oscillator are also disclosed.

REFERENCES:
patent: 53-093792 (1978-08-01), None
patent: 56-065517 (1981-06-01), None
patent: 2004-129181 (2004-04-01), None
patent: 2004-297343 (2004-10-01), None

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