Piezoelectric vibrator with internal electrodes
First Claim
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1. A vibrator comprising:
- a laminated element of at least two piezoelectric sheets;
internal electrodes formed between the laminated piezoelectric sheets;
external electrodes formed outside the laminated element;
insulators formed on upper and lower portions of the laminated element, wherein a vibration groove is formed on a surface of the insulators, the surface being in contact with the laminated element, and wherein the internal electrodes are not connected to the external electrodes,a dielectric substrate, which functions as a capacitor with terminals, installed on the lower portion of the laminated element; and
a protective cap for protecting elements installed on the upper portion of the laminated element.
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Abstract
The present invention relates to piezoelectric vibrators such as a resonator used as a timing element, discriminator, filter or the like, and fabricating methods thereof. The piezoelectric vibrators of the present invention may be fabricated by forming a piezoelectric body of piezoelectric sheets, of which the thickness is controlled, and simultaneously sintering the sheets along with cover layers, on which grooves are formed. Also, the piezoelectric vibrator of the present invention is fabricated by laminating the piezoelectric sheets, of which the thickness is controlled, providing internal electrodes between the sheets, and forming external electrodes insulated from the internal electrodes.
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Citations
18 Claims
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1. A vibrator comprising:
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a laminated element of at least two piezoelectric sheets; internal electrodes formed between the laminated piezoelectric sheets; external electrodes formed outside the laminated element; insulators formed on upper and lower portions of the laminated element, wherein a vibration groove is formed on a surface of the insulators, the surface being in contact with the laminated element, and wherein the internal electrodes are not connected to the external electrodes, a dielectric substrate, which functions as a capacitor with terminals, installed on the lower portion of the laminated element; and a protective cap for protecting elements installed on the upper portion of the laminated element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vibrator comprising:
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a laminated element of at least two piezoelectric sheets; internal electrodes formed between the laminated piezoelectric sheets; external electrodes formed outside the laminated element; and conductive passages, which pass through the laminated element via through holes extending vertically therethrough and are not connected to the internal electrode, and each of which is connected to corresponding one of the external electrodes, wherein the internal electrodes are not connected to the external electrodes, the internal electrodes being printed on substantially the entire surface of the sheets and spaced apart from the conductive passages. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A vibrator comprising:
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a laminated element of at least two piezoelectric sheets; internal electrodes formed between the laminated piezoelectric sheets; external electrodes formed outside the laminated element; insulators formed on upper and lower portions of the laminated element, an insulating substrate, where the external terminals are formed, installed on the lower portion of the laminated element; and a protective cap for protecting elements installed on the upper portion of the laminated element; wherein a vibration groove is formed on a surface of the insulators, the surface being in contact with the laminated element, and wherein the internal electrodes are not connected to the external electrodes.
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Specification