US4900970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy-trapping-type piezoelectric resonance device
Assignee: Murata Manufacturing Co Ltd
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Filing: 1988-07-06
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Granted: 1990-02-13
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Expires: 2008-07-06
Abstract
Abstract An energy trapping type piezoelectric resonance device utilizing the mode of thickness extensional vibration comprises a plate-shaped body of a piezoelectric material and three or more electrodes provided to be opposed to each other through peizoelectric material layers in the direction of thickness of the body. At least one of the electrodes is provided to be smaller in area than the major surfaces of the body, to be capable of energy trapping.
Inventors
- 👤 Akira Ando
- 👤 Toshihiko Kittaka
- 👤 Yukio Sakabe
- 👤 Satoru Fujishima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:44
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03H9/178
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
An energy-trapping-by-frequency-lowering-type piezoelectric-resonance device utilizing the mode of thickness-extensional vibration, comprising: a plate-shaped body of a piezoelectric material having major surfaces; and three or more electrodes arranged opposed to each other in the direction of thickness of said body through layers of the piezoelectric material; and said electrodes being spaced apart from each other by an amount selected to result in resonance at a harmonic mode; and at least one of said electrodes being smaller in area than the major surfaces of said body, thereby to be capable of energy trapping by frequency lowering.
Claim 2
Dependent Claim
94 words
An energy-trapping-by-frequency-lowering-type piezoelectric-resonance device utilizing the mode of thickness-extensional vibration, comprising: a plate-shaped body of a piezoelectric material having major surfaces; and three or more electrodes arranged opposed to each other in the direction of thickness of said body through layers of the piezoelectric material; and said electrodes being spaced apart from each other by an amount selected to result in resonance at a harmonic mode; and at least one of said electrodes being smaller in area than the major surfaces of said body, thereby to be capable of energy trapping by frequency lowering.
Claim 3
Dependent Claim
35 words
A piezoelectric-resonance device in accordance with claim 1, wherein: said piezoelectric-material layers between said electrodes are polarized in alternate directions, and outermost two of said three or more electrodes are to be employed in driving.
Claim 4
Dependent Claim
26 words
A piezoelectric-resonance device in accordance with claim 2, wherein: said piezoelectric material is one in which frequency-lowering-type energy trapping of the fundamental mode cannot be achieved.
Claim 5
Dependent Claim
39 words
A piezoelectric resonance device in accordance with claim 3, wherein: said piezoelectric material is selected from the group consisting of lead zirconate titanate, PbTiO 3 , LiTaO 3 , LiNbO 3 and Li 2 B 4 O 7 .
Claim 6
Dependent Claim
32 words
A piezoelectric resonance device in accordance with claim 4, wherein: said electrodes are provided in an odd number of at least three, to suppress spurious output by utilizing an even order harmonic.
Claim 7
Dependent Claim
68 words
A piezoelectric resonance device in accordance with claim 1, wherein: said piezoelectric-material layers are polarized in the same direction, said three or more electrodes are divided into two electrode groups such that adjacent ones of said electrodes belong to different electrode groups while those belonging to the same electrode group are electrically connected with each other; and both of said electrode groups are supplied with voltage in driving.
Claim 8
Dependent Claim
26 words
A piezoelectric-resonance device in accordance with claim 6, wherein: said piezoelectric material is one in which frequency-lowering-type energy trapping of the fundamental mode cannot be achieved.
Claim 9
Dependent Claim
39 words
A piezoelectric resonance device in accordance with claim 7, wherein: said piezoelectric material is selected from the group consisting of lead zirconate titanate, PbTiO 3 , LiTaO 3 , LiNbO 3 and Li 2 B 4 O 7 .
Claim 10
Dependent Claim
32 words
A piezoelectric resonance device in accordance with claim 8, wherein: said electrodes are provided in an odd number of at least three, to suppress spurious output by utilizing an even order harmonics.
Claim 11
Dependent Claim
26 words
A piezoelectric device in accordance with claim 1, wherein all of said layers of piezoelectric material are for being driven by respective voltages on said electrodes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |