Laminated piezo-electric device
First Claim
1. A laminated piezo-electric device comprising:
- a pole-like laminate formed by alternately laminating piezo-electric layers and electrode layers in the direction of height;
a pair of outer electrode plates formed on the different side surfaces of said pole-like laminate, a pair of neighboring electrode layers having said piezo-electric layer sandwiched therebetween being electrically connected at their side surfaces to the outer electrode plates which are different from each other; and
flexible protruded electrically conducting terminals on the side surfaces of said pole-like laminate on where the outer electrodes are arranged, said flexible protruded electrically conducting terminals extending along the side surfaces of the electrode layers and adapted for following the stretching and contraction of said pole-like laminate in the direction of height thereof, wherein the electrode layers are joined to said outer electrode plates via said protruded electrically conducting terminals, wherein a glass layer is formed on the side surfaces of said pole-like laminate on where the outer electrodes are arranged so as to cover the side surfaces of the piezo-electric layers, and the root portions of said protruded electrically conducting terminals are buried in said glass layer, and wherein said protruded electrically conducting terminals are formed by applying an electrically conducting paste containing a glass powder and an electrically conducting metal powder onto the side surfaces of the pole-like laminate, followed by heating.
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Accused Products
Abstract
A laminated piezo-electric device comprising a pole-like laminate formed by alternately laminating piezo-electric layers and electrode layers in the direction of height, and a pair of outer electrode plates formed on the different side surfaces of said pole-like laminate, said two electrode layers neighboring each other with said the piezo-electric layer sandwiched therebetween being electrically connected at their side surfaces to the outer electrode plates which are different from each other, wherein flexible protruded electrically conducting terminals are provided on the side surfaces of said pole-like laminate on where the outer electrodes are arranged, said flexible protruded electrically conducting terminals extending along the side surfaces of the electrode layers and are capable of following the stretching and contraction of said pole-like laminate in the direction of height thereof, and the electrode layers being joined to said outer electrode plates via said protruded electrically conducting terminals. In this laminated piezo-electric device, the protruded electrically conducting terminals absorb the stress produced by the stretching and contraction of the pole-like laminate, and features excellent durability without causing the wires to be broken between the outer electrodes and the inner electrodes even when the piezo-electric device is continuously driven at a high electric field under a high pressure for extended periods of time.
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Citations
11 Claims
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1. A laminated piezo-electric device comprising:
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a pole-like laminate formed by alternately laminating piezo-electric layers and electrode layers in the direction of height;
a pair of outer electrode plates formed on the different side surfaces of said pole-like laminate, a pair of neighboring electrode layers having said piezo-electric layer sandwiched therebetween being electrically connected at their side surfaces to the outer electrode plates which are different from each other; and
flexible protruded electrically conducting terminals on the side surfaces of said pole-like laminate on where the outer electrodes are arranged, said flexible protruded electrically conducting terminals extending along the side surfaces of the electrode layers and adapted for following the stretching and contraction of said pole-like laminate in the direction of height thereof, wherein the electrode layers are joined to said outer electrode plates via said protruded electrically conducting terminals, wherein a glass layer is formed on the side surfaces of said pole-like laminate on where the outer electrodes are arranged so as to cover the side surfaces of the piezo-electric layers, and the root portions of said protruded electrically conducting terminals are buried in said glass layer, and wherein said protruded electrically conducting terminals are formed by applying an electrically conducting paste containing a glass powder and an electrically conducting metal powder onto the side surfaces of the pole-like laminate, followed by heating.
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2. A laminated piezo-electric device comprising:
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a pole-like laminate formed by alternately laminating piezo-electric layers and electrode layers in the direction of height;
a pair of outer electrode plates formed on the different side surfaces of said pole-like laminate, a pair of neighboring electrode layers having said piezo-electric layer sandwiched therebetween being electrically connected at their side surfaces to the outer electrode plates which are different from each other; and
flexible protruded electrically conducting terminals on the side surfaces of said pole-like laminate on where the outer electrodes are arranged, said flexible protruded electrically conducting terminals extending along the side surfaces of the electrode layers and adapted for following the stretching and contraction of said pole-like laminate in the direction of height thereof, wherein the electrode layers are joined to said outer electrode plates via said protruded electrically conducted terminals, and wherein the electrically conducting member for preventing local heat generation is provided on the outer surfaces of said outer electrode plates, and an electric current is supplied to the outer electrode plates through said electrically conducting member. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. A laminated piezo-electric device comprising:
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a pole-like laminate formed by alternately laminating piezo-electric layers and electrode layers in the direction of height;
a pair of outer electrode plates formed on the different side surfaces of said pole-like laminate, a pair of neighboring electrode layers having said piezo-electric layer sandwiched therebetween being electrically connected at their side surfaces to the outer electrode plates which are different from each other;
flexible protruded electrically conducting terminals on the side surfaces of said pole-like laminate on where the outer electrodes are arranged said flexible protruded electrically conducting terminals extending along the side surfaces of the electrode layers and adapted for following the stretching and contraction of said pole-like laminate in the direction of height thereof, wherein the electrode layers are joined to said outer electrode plates via said protruded electrically conducting terminals, wherein spaces between the side surfaces of said pole-like laminate and the inner surfaces of said outer electrode plates are filled with an electrically conducting resin composition, and said outer electrode plates are provided with grooves or slits, and wherein a glass layer is formed on the side surfaces of said pole-like laminate on where the outer electrodes are arranged to as to cover the side surfaces of the piezo-electric layers, and the root portions of said protruded electrically conducting terminals are buried in said glass layer. - View Dependent Claims (11)
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Specification