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Multi-layer ceramic capacitor

Assignee: Panasonic Holdings Corp
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Filing: 1987-03-09
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Granted: —
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Expires: 2007-03-09
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Abstract

Abstract Material forming dielectric ceramics includes an oxide containing a component A and a component B. The component A is selected from a group I of lead, calcium, strontium, and barium. The component B is selected from a group II of magnesium, nickel, titanium, zinc, niobium, and tungsten. The component A includes lead and at least one of the other substances in the group I. The component B includes at least two of the substances in the group II. A ratio between values a and b is chosen so that alb > 1.00, where the value a denotes a total mol value of the substances in the component A and the value b denotes a total mol value of the substances in the component B. Electrode layders are made of copper or an alloy principally containing copper. Since the firing temperature of the dielectric ceramics is low, excellent characteristics of a capacitor are enabled in spite of the fact that electrodes contain copper.

Inventors

  • 👤 Yoichiro Yokotani
  • 👤 Junichi Kato
  • 👤 Toshihiro Mihara

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 16:51
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/30; C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497; C04B35/499; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 152 words
A multi-layer ceramic capacitor comprising: (a) internal electrode layers; and (b) ceramic dielectric layers extending between the internal electrode layers; the ceramic dielectric layers including an oxide containing a component A and a component B, the component A being selected from a group I of lead, calcium, strontium, and barium, the component B being selected from a group II of magnesium, nickel, titanium, zinc, niobium, and tungsten, the component A including lead and at least one of the other substances in the group I, the component B including at least two of the substances in the group II, a ratio between values a and b being chosen so that a/b > 1.00, where the value a denotes a total mol value of the substances in the component A and the value b denotes a total mol value of the substances in the component B; the internal electrode layers containing at least copper.
Claim 2
Dependent Claim 152 words
A multi-layer ceramic capacitor comprising: (a) internal electrode layers; and (b) ceramic dielectric layers extending between the internal electrode layers; the ceramic dielectric layers including an oxide containing a component A and a component B, the component A being selected from a group I of lead, calcium, strontium, and barium, the component B being selected from a group II of magnesium, nickel, titanium, zinc, niobium, and tungsten, the component A including lead and at least one of the other substances in the group I, the component B including at least two of the substances in the group II, a ratio between values a and b being chosen so that a/b > 1.00, where the value a denotes a total mol value of the substances in the component A and the value b denotes a total mol value of the substances in the component B; the internal electrode layers containing at least copper.
Claim 3
Dependent Claim 14 words
The capacitor of claim 1 wherein the internal electrode layers essentially consist of copper.
Claim 4
Dependent Claim 17 words
The capacitor of claim 1 wherein the internal electrode layers consist of an alloy principally containing copper.
Claim 5
Dependent Claim 26 words
The capacitor of claim 1 further comprising an end electrode directly connected to a preset number of the internal electrode layers and containing at least copper.
Claim 6
Dependent Claim 13 words
The capacitor of claim 4 wherein the end electrode essentially consists of copper.
Claim 7
Dependent Claim 16 words
The capacitor of claim 4 wherein the end electrode consist of an alloy principally containing copper.
Claim 8
Dependent Claim 141 words
The capacitor of claim 4 wherein the end electrode includes an inner layer and an outer layer, the inner layer being directly connected to the preset number of the internal electrode layers, the outer layer extending over the inner layer, the inner layer including an inorganic oxide containing a component Xl and a component Yl, the component Xl being selected from the group I, the component Yl being selected from the group II, an inorganic oxide content of the inner layer being between 5 volume perent and 50 volume percent inclusive, the outer layer including an inorganic oxide containing a component X2 and a component Y2, the component X2 being selected from the group I, the component Y2 being selected from the group II, an inorganic oxide content of the outer layer being equal to or less than 5 volume percent.

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