EP0176805A2
Expired / Lapsed
EP
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Trapped-energy mode resonator and method of manufacturing the same
Assignee: NEC Corp
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Filing: 1985-09-06
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Granted: —
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Expires: 2005-09-06
Abstract
Abstract The application discloses a trapped-energy mode resonator comprising a plate (20) of piezoelectric material having a Poisson's ratio less than one third. a pair of central electrodes (21, 21') embedded within said piezoelectric plate so as to oppose each other; and short-circuited peripheral electrodes (22, 22') opposedly arranged within or on the surface of said plate (20) and formed so as to substantially not overlap said central electrodes in the thickness direction of said plate; the distance between said central electrodes being shorter than the distance between said short-circuited peripheral electrodes. The resonator can be manufactured by sintering together a stack of green sheets which have the central electrodes and opposed electrodes printed as conductive layers on their respective surfaces.
Inventors
- 👤 Takeshi C/O Nec Corporation Inoue
- 👤 Masanori C/O Nec Corporation Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 20:32
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03H9/178
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A trapped-energy mode resonator comprising a plate of piezoelectric material having a Poisson's ratio less than one third, a pair of central electrodes embedded within said piezoelectric plate so as to oppose each other; and short-circuited peripheral electrodes opposedly arranged within or on the surface of said plate so as not to overlap said central electrodes in the thickness direction of said plate; the distance between said central electrodes being shorter than the distance between said short-circuited peripheral electrodes.
Claim 2
Dependent Claim
79 words
A trapped-energy mode resonator comprising a plate of piezoelectric material having a Poisson's ratio less than one third, a pair of central electrodes embedded within said piezoelectric plate so as to oppose each other; and short-circuited peripheral electrodes opposedly arranged within or on the surface of said plate so as not to overlap said central electrodes in the thickness direction of said plate; the distance between said central electrodes being shorter than the distance between said short-circuited peripheral electrodes.
Claim 3
Independent Claim
67 words
A method of manufacturing a trapped-energy mode resonator comprising the steps of forming a plurality of green sheets by use of piezoelectric ceramic powder and organic binder; printing a conductive layer on the surface of each of said green sheets in form of each energy-trapping central electrode or short-circuited peripheral electrode; laminating said green sheets into one body by contact bonding; and sintering the laminated green sheets.
Claim 4
Independent Claim
67 words
A method of manufacturing a trapped-energy mode resonator comprising the steps of forming a plurality of green sheets by use of piezoelectric ceramic powder and organic binder; printing a conductive layer on the surface of each of said green sheets in form of each energy-trapping central electrode or short-circuited peripheral electrode; laminating said green sheets into one body by contact bonding; and sintering the laminated green sheets.
Claim 5
Dependent Claim
127 words
A trapped-energy mode resonator comprising a laminated plate of a plurality of piezoelectric layers having a Poisson's ratio less than one third; a pair of energy-trapping electrodes sandwiching at least one of said piezoelectric layers; a pair of short-circuited electrodes sandwiching at least two of said piezoelectric layers; said short-circuited electrodes being opposedly arranged within or on the surface of said laminated plate so as not to overlap said energy-trapping electrodes in the thickness direction of said laminated plate; the distance between said energy-trapping electrodes being shorter than the distance between said short-circuited electrodes, whereby the resonant frequency of said fundamental thickness-extension vibration of said laminated plate at said energy-trapping electrodes region is higher than the resonant frequency of said laminated plate at said short-circuited electrodes region.
Claim 6
Dependent Claim
127 words
A trapped-energy mode resonator comprising a laminated plate of a plurality of piezoelectric layers having a Poisson's ratio less than one third; a pair of energy-trapping electrodes sandwiching at least one of said piezoelectric layers; a pair of short-circuited electrodes sandwiching at least two of said piezoelectric layers; said short-circuited electrodes being opposedly arranged within or on the surface of said laminated plate so as not to overlap said energy-trapping electrodes in the thickness direction of said laminated plate; the distance between said energy-trapping electrodes being shorter than the distance between said short-circuited electrodes, whereby the resonant frequency of said fundamental thickness-extension vibration of said laminated plate at said energy-trapping electrodes region is higher than the resonant frequency of said laminated plate at said short-circuited electrodes region.
Claim 7
Dependent Claim
86 words
A trapped-energy mode resonator as claimed in claim 3, further comprising a pair of lead electrodes on said two side surfaces respectively said lead electrodes being connected to said energy-trapping electrodes respectively, said lead electrodes being arranged so as not to overlap to each other in the thickness direction of said laminated plate, and said short-circuited electrodes having slits at the region opposing to said lead electrodes such that said lead electrodes are not overlap said short-circuited electrodes in the thickness direction of said laminated plate.
Claim 8
Dependent Claim
42 words
A trapped-energy mode resonator as claimed in claim 3, wherein said piezoelectric plate is of a lead titanate piezoelectric ceramic and the ratio of the distance of said energy-trapping electrodes and the distance of said short-circuited electrodes is from 0.2 to 0.92.
References Cited (Backward Citations)
No citation records indexed.
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