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US4605876A
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Piezoelectric ceramic energy trapping electronic device
Assignee: Murata Manufacturing Co Ltd
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Filing: 1984-11-07
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Granted: 1986-08-12
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Expires: 2004-11-07
Abstract
Abstract Piezoelectric ceramic compositions comprising a principal component, ##EQU1## and manganese contained therein as an additive in the amount of 0.1 to 2.0 wt % of MnO 2 with respect to the weight of 1 mol of the principal component. The piezoelectric ceramic compositions are suitable for use for pyroelectric devices, piezoelectric vibrators, resonators, oscillators, ceramic filters, surface acoustic wave filters and so on.
Inventors
- 👤 Toshio Ogawa
- 👤 Toshihiko Kittaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/472; H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
A piezoelectric ceramic energy trapping electronic device using the thickness expansion third overtone mode vibration, said device having a composition comprising as a principal component, ##EQU4## and manganese contained therein as an additive in an amount of 0.1 to 2.0 wt % of MnO 2 with respect to the weight of 1 mole of said principal component, where 0.09≦x≦0.20, and -0.20≦α≦+0.20, wherein the temperature coefficient for the third overtone mode vibration in thickness expansion mode (Cfr.t 3 ) is within the range of -5ppm/°C. to +5ppm/°C.
Claim 2
Dependent Claim
86 words
A piezoelectric ceramic energy trapping electronic device using the thickness expansion third overtone mode vibration, said device having a composition comprising as a principal component, ##EQU4## and manganese contained therein as an additive in an amount of 0.1 to 2.0 wt % of MnO 2 with respect to the weight of 1 mole of said principal component, where 0.09≦x≦0.20, and -0.20≦α≦+0.20, wherein the temperature coefficient for the third overtone mode vibration in thickness expansion mode (Cfr.t 3 ) is within the range of -5ppm/°C. to +5ppm/°C.
Claim 3
Dependent Claim
12 words
A piezoelectric ceramic device as set forth in claim 1, wherein -0.15≦α≦-0.01.
Claim 4
Dependent Claim
30 words
A piezoelectric ceramic device as set forth in claim 1, wherein 0.095≦x≦0.135, and the amount of MnO 2 is 0.2 to 1.5 wt % per mol of said principal component.
Claim 5
Dependent Claim
73 words
The piezoelectric ceramic device as set forth in claim 3, wherein the raw materials PbO or Pb 3 O 4 , TiO 2 , La 2 O 3 and MnO 2 that are used in the preparation of said principal component are calcined at a temperature of 850° to 1000°, formed into disks fired at a temperature of 1150° to 1300° C. in an atmosphere containing 80 vol % or more of oxygen.
Claim 6
Dependent Claim
13 words
A piezoelectric ceramic electronic device as in claim 1, which is a vibrator.
Claim 7
Dependent Claim
13 words
A piezoelectric ceramic electronic device as in claim 1, which is a resonator.
Claim 8
Dependent Claim
13 words
A piezoelectric ceramic electronic device as in claim 1, which is an oscillator.
Claim 9
Dependent Claim
13 words
A piezoelectric ceramic electronic device as in claim 1, which is a filter.
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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) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |