Piezoelectric element, piezoelectric vibration module, and methods of manufacturing the same
First Claim
1. A piezoelectric vibration module comprising a piezoelectric element, a wiring member connected to the piezoelectric element and drawn out to the outside, and an elastic plate attached to one surface of the piezoelectric element,wherein the elastic plate is made of a silicone rubber,wherein the piezoelectric element comprises a laminate in which piezoelectric body layers and electrode layers are alternately laminated, and a first and a second side electrode provided on both end faces or both side surfaces in a second direction crossing a first direction being a lamination direction of the laminate,wherein each electrode layer comprises a first electrode portion and a second electrode portion electrically separated from the first electrode portion,wherein the first side electrode comprises a first external electrode and a second external electrode which are disposed side by side in a third direction crossing the first and second directions,wherein the first electrode portion of each electrode layer is connected to the first external electrode, andwherein one end, in the second direction, of the second electrode portion of each electrode layer is connected to the second external electrode.
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Accused Products
Abstract
A piezoelectric vibration module includes a piezoelectric element, a wiring member connected to the piezoelectric element and drawn out to the outside, and an elastic plate bonded to one surface of the piezoelectric element, wherein the elastic plate is made of a silicone rubber.
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Citations
43 Claims
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1. A piezoelectric vibration module comprising a piezoelectric element, a wiring member connected to the piezoelectric element and drawn out to the outside, and an elastic plate attached to one surface of the piezoelectric element,
wherein the elastic plate is made of a silicone rubber, wherein the piezoelectric element comprises a laminate in which piezoelectric body layers and electrode layers are alternately laminated, and a first and a second side electrode provided on both end faces or both side surfaces in a second direction crossing a first direction being a lamination direction of the laminate, wherein each electrode layer comprises a first electrode portion and a second electrode portion electrically separated from the first electrode portion, wherein the first side electrode comprises a first external electrode and a second external electrode which are disposed side by side in a third direction crossing the first and second directions, wherein the first electrode portion of each electrode layer is connected to the first external electrode, and wherein one end, in the second direction, of the second electrode portion of each electrode layer is connected to the second external electrode.
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10. A piezoelectric element comprising a laminate in which piezoelectric body layers and electrode layers are alternately laminated, and a first and a second side electrode provided on both end faces or both side surfaces in a second direction crossing a first direction being a lamination direction of the laminate,
wherein each electrode layer comprises a first electrode portion and a second electrode portion electrically separated from the first electrode portion, wherein the first side electrode comprises a first external electrode and a second external electrode which are disposed side by side in a third direction crossing the first and second directions, wherein the first electrode portion of each electrode layer is connected to the first external electrode, wherein one end, in the second direction, of the second electrode portion of each electrode layer is connected to the second external electrode, wherein the other end, in the second direction, of the second electrode portion of each of the electrode layers at both ends in the first direction is connected to the second side electrode, and wherein the electrode layers and the first and second side electrodes are electrically connected so that a driving voltage can be applied between the first electrode portions and the second electrode portions using the second electrode portions of the electrode layers at both ends in the first direction as driving external electrodes and the first electrode portions of the intermediate electrode layers between both ends in the first direction as driving internal electrodes.
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13. A method of manufacturing a piezoelectric element, comprising:
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a step of preparing a first piezoelectric body having three mutually insulated electrodes; a step of preparing a second piezoelectric body having two mutually insulated electrodes; a step of preparing at least one third piezoelectric body having three mutually insulated electrodes; a step of forming a laminate in which the third piezoelectric body is laminated between the first and second piezoelectric bodies, and the three electrodes of the first piezoelectric body and the three electrodes of the third piezoelectric body are electrically connected to each other and two of the three electrodes of each of the first and third piezoelectric bodies and the two electrodes of the second piezoelectric body are electrically connected to each other; a step of polarizing the first and second piezoelectric bodies using the three electrodes of the first piezoelectric body; a step of electrically connecting one and another one of the three electrodes of the first piezoelectric body to each other and forming two mutually electrically insulated element electrodes; and a step of connecting a terminal having conductor patterns which are electrically connected to the two element electrodes of the first piezoelectric body. - View Dependent Claims (14, 15)
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16. A piezoelectric vibration module comprising:
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a piezoelectric element, a wiring member connected to the piezoelectric element and drawn out to the outside, an elastic plate attached to one surface of the piezoelectric element, a housing member provided so as to cover the piezoelectric element and a connecting portion, with the piezoelectric element, of the wiring member, and a sound pressure adjusting means, wherein the sound pressure adjusting means comprises a protruding portion provided so as to protrude from a surface of the housing member and wherein the protruding portion is provided at a portion corresponding to a node of resonance, excited by the piezoelectric vibration module, of a mounting member to which the piezoelectric vibration module is mounted. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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- 28. A piezoelectric element comprising a laminate in which a plurality of piezoelectric element portions are laminated in a first direction, wherein the piezoelectric element portions have piezoelectric body layers, surface electrode layers formed on the piezoelectric body layers in a second direction crossing the first direction, and first and second lead-out electrodes formed at ends in the second direction of the piezoelectric body layers and connected to the surface electrode layers, wherein the first and second lead-out electrodes are drawn out from the surface electrode layers to the ends of the piezoelectric body layers corresponding to lamination positions of the piezoelectric element portions in the laminate.
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33. A method of manufacturing a piezoelectric element, comprising:
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a step of preparing a plurality of piezoelectric element portions having piezoelectric body layers, surface electrode layers, and mutually different end electrode layers formed at ends; and a step of forming a laminate by laminating the plurality of piezoelectric element portions in a first direction in order, wherein, in the step of forming a laminate, the end electrode layers of the piezoelectric element portions are laminated so as to be drawn out to the end sides corresponding to lamination positions of the piezoelectric element portions in the laminate. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification