Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1988-12-05
1989-11-21
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
29 2542, 252 623BT, H01G 410, H01G 442, H01G 700
Patent
active
048826510
ABSTRACT:
A green ceramic cake is formed comprised of a center layer of fine-ceramic particles sandwiched between two outer layers of relatively coarse-ceramic particles. However, the chemical compositions of the center and outer layers are all essentially the same. The center layer contains a stack of spaced-apart film-patterns of electroding ink. This cake is separated into many individual green monolithic-ceramic capacitors each with electrodes extending conventionally to opposite ends thereof. These capacitors are sintered to mature the ceramic, and conductive terminations are formed at the opposite ends contacting the buried electrodes. The finer start powder of the center layer is relatively expensive, but the resulting fine grain homogenous grain structure there in the finished capacitor permits closely spaced buried electrodes and generally a higher quality dielectric due to greater density and more homogenous composition than is achieved in the cheaper outer layer material.
REFERENCES:
patent: 4284521 (1981-08-01), Payne et al.
patent: 4302625 (1981-11-01), Hetherington et al.
patent: 4424615 (1984-01-01), Wakino
patent: 4533974 (1985-08-01), Maher
patent: 4556929 (1985-12-01), Tanaka et al.
patent: 4620264 (1986-10-01), Ushifusa et al.
patent: 4650648 (1987-03-01), Beer et al.
patent: 4764357 (1988-08-01), Sherif et al.
Griffin Donald A.
Sprague Electric Company
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