Piezoelectric vibrator ladder-type filter using piezoeletric...

Details Piezoelectric vibrator ladder-type filter using piezoeletric... Piezoelectric vibrator ladder-type filter using piezoeletric...

2006-01-31

2006-01-31

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S365000, C310S368000

Reexamination Certificate

active

06992424

ABSTRACT:
A piezoelectric vibrator which uses lithium tantalate as a piezoelectric material and of which main vibration is thickness shear vibration. The thickness direction of the vibrator forms angle of 0°±5° to the X-axis of a single crystal. The longitudinal direction of vibrator lies, with the X-axis used as a rotation axis, in direction n +57°±2° clockwise from the Y-axis of the single crystal. A ratio L/H of the length L of the vibrator to the thickness H is not less than 15. A ratio Le/H of the length Le of the exciting electrode to the thickness H of the vibrator element portion is 3–6. Accordingly, a vibrator having improved temperature characteristics and a large Q is realized.

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International Search Report corresponding to application no. PCT/JP02/01013 dated May 21, 2002.

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