US5117326A
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Monolithic ceramic capacitor
Assignee: Murata Manufacturing Co Ltd
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Filing: 1990-04-04
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Granted: 1992-05-26
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Expires: 2010-04-04
Abstract
Abstract A monolithic ceramic capacitor is characterized in that dielectric ceramic layers are made up of a dielectric ceramic composition consisting essentially of a basic composition and an antireducing agent incorporated therein to prevent it from reduction. The basic composition mainly comprises barium titanate and a bismuth compound incorporated therein, and the internal electrodes comprises a copper or a copper alloy. The antireducing agent has a composition expressed by the general formula: ##EQU1## wherein RO is at least one oxide selected from the group consisting of MgO, CaO, SrO and BaO, α, β and γ are molar percentages of the respective components and take a value within the following respective ranges, 5≦α≦20, 10≦β≦60, 20≦γ≦35. The internal electrode may contain at least one additive selected from the group consisting of glass frit, powered dielectric and antireducing agent.
Inventors
- 👤 Harunobu Sano
- 👤 Nagato Omori
- 👤 Yoshiaki Kohno
- 👤 Yukio Sakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:31
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/4684; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; H01G4/1236; H01G4/1245
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A monolithic ceramic capacitor comprising a plurality of dielectric ceramic layers united to one another to form a monolithic body, a plurality of internal electrodes each formed between two adjacent dielectric ceramic layers, and external electrodes formed on opposite sides of said monolithic body and each being connected to alternate internal electrodes, characterized in that said dielectric ceramic layers are made up of a dielectric ceramic composition consisting essentially of a basic composition and an antireducing agent incorporated therein to prevent it from reduction, said basic composition mainly comprising barium titanate and a bismuth compound incorporated therein, and in that said internal electrodes comprise copper or a copper alloy.
Claim 2
Dependent Claim
109 words
A monolithic ceramic capacitor comprising a plurality of dielectric ceramic layers united to one another to form a monolithic body, a plurality of internal electrodes each formed between two adjacent dielectric ceramic layers, and external electrodes formed on opposite sides of said monolithic body and each being connected to alternate internal electrodes, characterized in that said dielectric ceramic layers are made up of a dielectric ceramic composition consisting essentially of a basic composition and an antireducing agent incorporated therein to prevent it from reduction, said basic composition mainly comprising barium titanate and a bismuth compound incorporated therein, and in that said internal electrodes comprise copper or a copper alloy.
Claim 3
Dependent Claim
62 words
A monolithic ceramic capacitor according to claim 1 wherein said antireducing agent has a composition expressed by the general formula: ##EQU3## wherein RO is at least one oxide selected from the group consisting of MgO, CaO, SrO and BaO, α, β and γ are molar percentages of the respective components and take a value within the following respective ranges, 5≦α≦20, 10≦β≦60, 20≦γ≦35.
Claim 4
Dependent Claim
31 words
A monolithic ceramic capacitor according to claim 1 wherein each said internal electrode contains at least one additive selected from the group consisting of glass frit, powdered dielectric, and antireducing agent.
Claim 5
Dependent Claim
22 words
A monolithic ceramic capacitor according to claim 3 wherein the content of said additive is not more than 40 wt % .
Claim 6
Dependent Claim
94 words
A monolithic ceramic capacitor according to claim 1 wherein said basic composition has a composition expressed by the general formula: aBaTiO.sub.3 +bBi.sub.2 O.sub.3 +cTiO.sub.2 +dM+ePb.sub.3 O.sub.4 +fNb.sub.2 O.sub.5 where M is at least one oxide selected from the group consisting of La 2 O 3 , CeO 2 , Nd 2 O 3 , Sm 2 O 3 and Nd 2 O 3 , and a, b, c, d, e and f are weight percentages of the respective components and take a value within the following respective ranges: 60.0≦a≦98.0, 1.0≦b≦15.0, 0.2≦c≦20.0, 0.2≦d≦8.0, 0.2≦e≦15.0, 0.2≦f≦5.0.
Claim 7
Dependent Claim
28 words
A monolithic ceramic capacitor according to claim 1 wherein said basic composition is of a BaTiO 3 +Bi 2 O 3 .SnO 2 +Nd 2 O 3 system.
Claim 8
Dependent Claim
26 words
A monolithic ceramic capacitor according to claim 1 wherein said basic composition is of a BaTiO 3 +Bi 2 O 3 .ZrO 2 +CeO 2 system.
Claim 9
Dependent Claim
26 words
A monolithic ceramic capacitor according to claim 1 wherein said basic composition is of a BaTiO 3 +Bi 2 O 3 .ZrO 2 +CeO 2 system.
Claim 10
Dependent Claim
98 words
A monolithic ceramic capacitor comprising a plurality of dielectric ceramic layers united to one another to form a monolithic body, a plurality of internal electrodes each formed between two adjacent dielectric ceramic layers, and external electrodes formed on opposite sides of said monolithic body and connected to alternate internal electrodes, wherein: a) said dielectric ceramic layers consist essentially of (1) a basic dielectric ceramic composition mainly comprising barium titanate and a bismuth compound, and (2) an antireducing agent which gives said basic composition additional resistance to reduction; and b) said internal electrodes comprise copper or a copper alloy.
Claim 11
Dependent Claim
98 words
A monolithic ceramic capacitor comprising a plurality of dielectric ceramic layers united to one another to form a monolithic body, a plurality of internal electrodes each formed between two adjacent dielectric ceramic layers, and external electrodes formed on opposite sides of said monolithic body and connected to alternate internal electrodes, wherein: a) said dielectric ceramic layers consist essentially of (1) a basic dielectric ceramic composition mainly comprising barium titanate and a bismuth compound, and (2) an antireducing agent which gives said basic composition additional resistance to reduction; and b) said internal electrodes comprise copper or a copper alloy.
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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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |