Piezoelectric vibrator unit
AssigneeSeiko Epson Corporation
InventorTsuyoshi Kitahara
Life of this patent
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Abstract
A piezoelectric vibrator unit comprises: at least one piezoelectric vibrator including: common internal electrode layers and segment internal electrode layers arranged alternately; piezoelectric layers, each interposed between adjacent pair of the common and segment internal electrode layers; and external electrodes formed on an exterior of the piezoelectric vibrator and electrically connected respectively to the common internal electrode layers and the segment internal electrode layers; and a fixing member to which a surface of the piezoelectric vibrator is fixed. The piezoelectric vibrator is displaceable in a direction perpendicular to a lamination direction in which the internal electrode layers and piezoelectric layers are laminated. The magnitude of electric fields applied to the piezoelectric layers is non-uniform.
Claims24
A piezoelectric vibrator unit comprising:
- at least one piezoelectric vibrator including:
- common internal electrode layers and segment internal electrode layers arranged alternately;
- piezoelectric layers, each interposed between adjacent pair of the common and segment internal electrode layers;
- and
- external electrodes formed on an exterior of the piezoelectric vibrator and electrically connected respectively to the common internal electrode layers and the segment internal electrode layers;
- and
- a fixing member to which a surface of the piezoelectric vibrator is fixed;
- wherein the piezoelectric vibrator is displaceable in a direction perpendicular to a lamination direction in which the internal electrode layers and piezoelectric layers are laminated;
- wherein a magnitude of electric fields applied between the common and segment internal electrode layers to the piezoelectric layers is non-uniform to cancel a bending moment caused during contraction of the piezoelectric vibrator.
A piezoelectric vibrator unit comprising:
- at least one piezoelectric vibrator including:
- common internal electrode layers and segment internal electrode layers arranged alternately;
- piezoelectric layers, each interposed between adjacent pair of the common and segment internal electrode layers;
- and
- external electrodes formed on an exterior of the piezoelectric vibrator and electrically connected respectively to the common internal electrode layers and the segment internal electrode layers;
- and
- a fixing member to which a surface of the piezoelectric vibrator is fixed;
- wherein the piezoelectric vibrator is displaceable in a direction perpendicular to a lamination direction in which the internal electrode layers and piezoelectric layers are laminated;
- wherein the piezoelectric layers are non-uniform in thickness.
A piezoelectric vibrator unit comprising:
- at least one piezoelectric vibrator including:
- common internal electrode layers and segment internal electrode layers arranged alternately;
- piezoelectric layers, each interposed between adjacent pair of the common and segment internal electrode layers;
- and
- external electrodes formed on an exterior of the piezoelectric vibrator and electrically connected respectively to the common internal electrode layers and the segment internal electrode layers;
- and
- a fixing member to which a first surface of the piezoelectric vibrator is fixed;
- wherein the piezoelectric vibrator is displaceable in a direction perpendicular to a lamination direction in which the internal electrode layers and piezoelectric layers are laminated;
- wherein the internal electrode layers are non-uniform in thickness.
A piezoelectric vibrator unit comprising:
- at least one piezoelectric vibrator including:
- common internal electrode layers and segment internal electrode layers arranged alternately;
- piezoelectric layers, each interposed between adjacent pair of the common and segment internal electrode layers;
- and
- external electrodes formed on an exterior of the piezoelectric vibrator and electrically connected respectively to the common internal electrode layers and the segment internal electrode layers;
- and
- a fixing member to which a first surface of the piezoelectric vibrator is fixed;
- wherein the piezoelectric vibrator is displaceable in a direction perpendicular to a lamination direction in which the internal electrode layers and piezoelectric layers are laminated;
- wherein an electric field applied portion of at least one of the piezoelectric layers, located away from the surface fixed to the fixing member, is shorter than other electric field applied portions of other piezoelectric layers that are located between the at least one piezoelectric layer and the first surface.
An piezoelectric vibrator unit comprising at least one piezoelectric vibrator, and a fixing member to which a first side surface of the piezoelectric vibrator at a base end thereof is fixed, the piezoelectric vibrator having, at least in part, a laminated structure including common and segment internal electrode layers laminated alternately with a piezoelectric layer interposed between each adjacent pair of the common and segment internal electrode layers, a first external electrode electrically conducted to the common internal electrode layers, and a second external electrode electrically conducted to the segment internal electrode layers, so that the piezoelectric vibrator is displaceable in a direction perpendicular to a lamination direction,
- wherein the piezoelectric vibrator further includes a counterbalancing bending moment producing portion that produces a bending moment canceling a bending moment caused during contraction of the piezoelectric vibrator due to a structure in which the first side surface of the piezoelectric vibrator is fixed at the base end thereof to the fixing member.
Dependencies are inferred from the claim text.