Dielectric ceramic and laminated ceramic capacitor
US8445396B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Sep 6, 2011 |
| Grant date | May 21, 2013 |
| Priority date | — |
| Expiry date | Oct 4, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/79
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A laminated ceramic capacitor suitable for intermediate to high voltage applications uses a dielectric ceramic represented by {100(BaTiO3+aBaZrO3)+bR+cMg+dMn+eSi} where R is a rare earth element; 0≦a≦0.2, 8.0≦b≦12.0, 1.0≦c≦10.0, 0.1≦d≦3.0, and 1.0≦e≦10.0, and includes first grains of 0.7 μm or more in grain size and an average first grain size (Aave) and area ratio of the ceramic (SA), and second grains of 0.6 μm or less in grain size and an average second grain size (Bave) and area ratio (SB), 0.8 μm≦Aave≦2.0 μm, 0.1 μm≦Bave≦0.5 μm, Aave/Bave≧3.0, 0.3≦SA≦0.9, 0.1≦SB≦0.7, and 0.8≦SA+SB≦1.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.