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US 6,437,484 B1Granted
Piezoelectric resonator
AssigneeKYOCERA Corporation
InventorsMichiaki Nishimura, Kousei Kamigaki, Ken-ichi Yoshimura, Hirotaka Tsuyoshi
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AssigneeKYOCERA Corporation
InventorsMichiaki Nishimura, Kousei Kamigaki, Ken-ichi Yoshimura, Hirotaka Tsuyoshi
Estimating the term…
A piezoelectric resonator having a resonator element in or on a substrate, said resonator element comprising a laminate of a plurality of piezoelectric ceramic layers and a plurality of electrode layers which are alternately laminated one upon the other, the piezoelectric ceramic layers neighboring up and down being set to oscillate in opposite phases relative to each other. In the piezoelectric resonator, the piezoelectric ceramic layers neighboring up and down undergo the thickness longitudinal oscillation in opposite phases, suppressing the oscillation of the fundamental mode and strongly exciting the oscillation of a mode of a high degree of not lower than the second degree. The piezoelectric resonator utilizing the mode of a high degree of not lower than the second degree is little affected by spurious caused by the oscillation of the fundamental mode.
A piezoelectric resonator having a resonator element in or on a substrate, said resonator clement comprising a laminate of a plurality of piezoelectric ceramic layers and a plurality of electrode layers which are alternatively laminated one upon the other, the piezoelectric ceramic layer neighboring upon and down being set to oscillate in opposite phases relative to each other, wherein said resonator element is formed on a support film formed on the surface of the substrate and wherein the surface of said support film opposite to the surface of the side on where the resonator element is formed, partly faces an oscillation space.
A piezoelectric resonator having a resonator element in or on a substrate, said resonator clement comprising a laminate of a plurality of piezoelectric ceramic layers and a plurality of electrode layers which are alternatively laminated one upon the other, the piezoelectric ceramic layer neighboring upon and down being set to oscillate in opposite phases relative to each other, wherein said resonator element is formed on a support film formed on the surface of the substrate and wherein an uppermost electrode layer is formed in the central portion on the upper surface of the piezoelectric ceramic layer located at the uppermost position, and the piezoelectric ceramic layers located on the outer side of said uppermost electrode layer are not polarized.
A piezoelectric resonator having a resonator element in or on a substrate, said resonator element comprising a laminate of a plurality of piezoelectric ceramic layers and a plurality of electrode layers which are alternatively laminated one upon the other, the piezoelectric ceramic layer neighboring upon and down being set to oscillate in opposite phases relative to each other, wherein said resonator element is formed on a support film formed on the surface of the substrate and having two piezoelectric ceramic layers.
A piezoelectric resonator having a resonator clement in or on a substrate, said resonator clement comprising a laminate of a plurality of piezoelectric ceramic layers and a plurality of electrode layers which are alternatively laminated one upon the other, the piezoelectric ceramic layer neighboring upon and down being set to oscillate in opposite phases relative to each other, wherein said resonator element is formed on a support film formed on the surface of the substrate and wherein:
A piezoelectric resonator having a resonator element in or on a substrate, said resonator clement comp sing a laminate of a plurality of piezoelectric ceramic layers and a plurality of electrode layers which are alternatively laminated one upon the other, the piezoelectric ceramic layer neighboring upon and down being set to oscillate in opposite phases relative to each other wherein:
A filter having a plurality of resonance elements arranged in parallel in or on the surface of a substrate;
Dependencies are inferred from the claim text.