Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1996-12-18
1998-03-31
Ledynh, Bot L.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
361313, 3613215, 3613063, 361309, 361320, H01G 406, H01G 4228, H01G 420
Patent
active
057345457
ABSTRACT:
Disclosed is a monolithic ceramic capacitor comprising dielectric ceramic layers made from a material which comprises an essential component of (1-.alpha.-.beta.){BaO}.sub.m .cndot.TiO.sub.2 +.alpha.Re.sub.2 O.sub.3 30 .beta.(Mn.sub.1-x-y Ni.sub.x Co.sub.y)O (0.0025.ltoreq..alpha..ltoreq.0.025; 0.0025.ltoreq..beta..ltoreq.0.05; .beta./.alpha..ltoreq.4; 0.ltoreq.x<1.0; 0.ltoreq.y<1.0; 0.ltoreq.x+y<1.0; 1.000<m.ltoreq.1.035) and from about 0.1 to 3.0 mols, relative to 100 mols of the essential component, of a side component MgO, and contains from about 0.2 to 3.0 parts by weight, relative to 100 parts by weight of said components, of an oxide of the type of Li.sub.2 O-B.sub.2 O.sub.3 -(Si,Ti)O.sub.2. The capacitor is low-priced and can be small-sized, while having large-capacity. It has a dielectric constant of 3000 or more, and has a high insulating resistance of 6000 M.OMEGA..cndot..mu.F or more and 2000 M.OMEGA..cndot..mu.F or more at 2 KV/mm and at room temperature and 125.degree. C., respectively, and 2000 M.OMEGA..cndot..mu.F or more and 500 M.OMEGA..cndot..mu.F or more at 20 KV/mm and at room temperature and 125.degree. C., respectively. It has temperature-dependent capacitance that satisfies the B-level characteristic standard stipulated in the JIS Standard and the X7R-level characteristic standard stipulated in the EIA Standard, and has high reliability irrespective of the presence or absence of plate film covering it.
REFERENCES:
patent: 5268342 (1993-12-01), Nishiyama et al.
patent: 5668694 (1997-09-01), Sato et al.
Hamaji Yukio
Sano Harunobu
Ledynh Bot L.
Murata Manufacturing Co. Ltd.
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