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US 6,144,141 AGranted
Piezoelectric resonator and electronic component containing same
AssigneeMurata Manufacturing Co., Ltd.
InventorsToshihiko Unami, Jiro Inoue
Life of this patent
Estimating the term…
Abstract
A piezoelectric resonator has a base member including laminated piezoelectric layers and internal electrodes. The base member is polarized in different directions at both sides of each internal electrode. The internal electrodes are alternately covered by insulating film on opposing side surfaces of the base member. External electrodes are formed on the opposing side surfaces of the base member and the internal electrodes are connected thereto, respectively.
Claims16
A piezoelectric resonator comprising:
- a piezoelectric base member including a plurality of piezoelectric layers and a plurality of electrodes;
- means for driving said piezoelectric base member;
- and
- a support substrate supporting said piezoelectric base member;
- wherein
- at least two of said piezoelectric layers are stacked on each other and at least one of said plurality of electrodes is disposed between said at least two of said piezoelectric layers and said at least two of said piezoelectric layers are polarized in opposite directions such that a longitudinal basic vibration is generated in said base member along a longitudinal axis of the piezoelectric base member and said piezoelectric base member is displaced along the longitudinal axis when said means for driving said piezoelectric base member applies an electric field to said at least one of said plurality of electrodes and such that a single vibration node at which point substantially no vibration occurs is defined at an approximate center of the piezoelectric base member and said piezoelectric base member is supported on said support substrate only at a location of said single vibration node located at the approximate center of the piezoelectric base member.
3 more elements
A piezoelectric resonator comprising:
- a piezoelectric base member including a plurality of piezoelectric layers and a plurality of electrodes;
- means for driving said piezoelectric base member;
- and
- a support substrate supporting said piezoelectric base member;
- wherein
- said plurality of piezoelectric layers and said plurality of electrodes are arranged in a laminated stack which defines an integral unit and which is arranged such that when said means for vibrating said piezoelectric base member applies an electric field to the piezoelectric base member, the piezoelectric base member vibrates in a longitudinal vibration mode along a longitudinal axis of the piezoelectric base member and said piezoelectric base member is displaced along the longitudinal axis such that a single vibration node at which point substantially no vibration occurs is defined at an approximate center of the piezoelectric base member and said piezoelectric base member is supported on said support substrate only at a location of said single vibration node located at the approximate center of the piezoelectric base member.
3 more elements
A piezoelectric resonator comprising:
- a piezoelectric base member including a plurality of piezoelectric layers and a plurality of electrodes;
- means for driving said piezoelectric base member;
- and
- a support substrate supporting said piezoelectric base member;
- wherein
- each of said plurality of piezoelectric layers is arranged to vibrate in a thickness mode and said plurality of piezoelectric layers and said plurality of electrodes are arranged in an integral stack such that when said means for vibrating said piezoelectric base member applies an electric field to the piezoelectric base member, said base member vibrates in a longitudinal vibration mode along a longitudinal axis of the piezoelectric base member and said piezoelectric base member is displaced along the longitudinal axis such that a single vibration node at which point substantially no vibration occurs is defined at an approximate center of the piezoelectric base member and said piezoelectric base member is supported on said support substrate only at a location of said single vibration node located at the approximate center of the piezoelectric base member.
3 more elements
An electronic component comprising:
- a substrate;
- a mounting member mounted on said substrate;
- at least one piezoelectric resonator including a piezoelectric base member including a plurality of piezoelectric layers and a plurality of electrodes;
- means for driving said at least one piezoelectric resonator;
- wherein
- at least two of said piezoelectric layers being stacked on each other and at least one of said plurality of electrodes being disposed between said at least two of said piezoelectric layers and said at least two of said piezoelectric layers are polarized in opposite directions, and being arranged such that when said means for vibrating said piezoelectric base member applies an electric field to the piezoelectric base member, the piezoelectric base member vibrates in a longitudinal vibration mode along a longitudinal axis of the piezoelectric base member and said piezoelectric base member is displaced along the longitudinal axis such that a single vibration node at which point substantially no vibration occurs is defined at an approximate center of the piezoelectric base member and such that a vibration node at which point substantially no vibration occurs is defined at an approximate center of the piezoelectric base member, said at least one piezoelectric resonator being mounted on said substrate via said mounting member such that the piezoelectric base member is supported only at said single node point at the approximate center of the piezoelectric base member;
- a cap disposed on said substrate for covering said base member.
4 more elements
An electronic component comprising:
- a substrate having a pattern electrode disposed thereon;
- a mounting member mounted on said pattern electrode on said substrate;
- a plurality of piezoelectric resonators including a piezoelectric base member containing a plurality of piezoelectric layers and a plurality of internal electrodes;
- means for vibrating said plurality of piezoelectric resonators;
- wherein
- at least two of said piezoelectric layers being stacked on each other and at least one of said plurality of electrodes is disposed between said at least two of said piezoelectric layers and said at least two of said piezoelectric layers are polarized in opposite directions and are arranged such that when said means for vibrating said piezoelectric base member applies an electric field to the piezoelectric base member, the piezoelectric base member vibrates in a longitudinal vibration mode along a longitudinal axis of the piezoelectric base member and said piezoelectric base member is displaced along the longitudinal axis such that a single vibration node at which point substantially no vibration occurs is defined at an approximate center of the piezoelectric base member, said piezoelectric base member including at least one pair of external electrodes being arranged such that each of said plurality of internal electrodes is electrically connected to one of said at least one pair of external electrodes, said at least one piezoelectric resonator being mounted on said pattern electrode on said substrate via said mounting member such that said pattern electrode is electrically connected to said at least one pair of external electrodes such that the piezoelectric base member is supported only at said single node point at the approximate center of the piezoelectric base member;
- and
- a cap disposed on said substrate for covering said base member.
5 more elements
Dependencies are inferred from the claim text.