Piezoelectric resonator, method for adjusting frequency thereof and communication apparatus comprising said resonator

A piezoelectric resonator and resonant frequency technology, applied in piezoelectric devices/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve difficult applications, automation difficulties, performance changes, etc. question
CN1118133CInactive Publication Date: 2003-08-13MURATA MFG CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
MURATA MFG CO LTD
Publication Date
2003-08-13
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A base member of a piezoelectric resonator includes a laminated body having a plurality of piezoelectric layers which are alternately polarized in opposite directions along the longitudinal direction of the base member and inner electrodes provided between the piezoelectric layers. On a first side surface of the base member, each of two external electrodes is arranged so as to be connected to one of two groups of alternate inner electrodes. Cut portions for adjusting a frequency of the piezoelectric resonator to a higher frequency are respectively formed at edge portions of the base member at opposite ends in the longitudinal direction of a second side surface opposite from the first side surface of the base member.
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Description

Technical field

[0001] The present invention relates to a piezoelectric resonator, a method for adjusting the frequency of the piezoelectric resonator, and a communication device containing the piezoelectric resonator. The present invention particularly relates to piezoelectric resonators applied to electronic components such as vibrators, discriminators, or filters. Background technique

[0002] In a conventional piezoelectric resonator, external electrodes are respectively provided on the two main surfaces of a piezoelectric substrate, which adopts a rectangular or square plate shape. The piezoelectric substrate is polarized along its thickness direction, and by inputting a signal between the electrodes, an electric field is applied along the thickness direction of the piezoelectric substrate to make the piezoelectric substrate vibrate in a direction parallel to its main surface.

[0003] The piezoelectric resonator is of a non-hardened type, in which the electric field directi...

Claims

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