MULTILAYER CERAMIC CAPACITOR AND MOUNTING BOARD HAVING MULTILAYER CERAMIC CAPACITOR MOUNTED THEREON
First Claim
1. A multilayer ceramic capacitor, comprising:
- a ceramic body having a plurality of dielectric layers laminated therein, the dielectric layers respectively having an average thickness of 0.2 to 2.0 μ
m;
an active layer including a plurality of first and second internal electrodes alternately exposed through both end surfaces of the ceramic body having the dielectric layer interposed therebetween and contributing to capacitance formation;
an upper cover layer formed above the active layer;
a lower cover layer formed below the active layer, the lower cover layer being thicker than the upper cover layer; and
first and second external electrodes covering the end surfaces of the ceramic body,wherein a bottommost internal electrode adjacent to the lower cover layer has an oxide layer formed on at least one of top and bottom surfaces thereof, andwhen a length and a thickness of the bottommost internal electrode are denoted by Le and te, respectively, and a length and a thickness of the oxide layer are denoted by Lo and to, respectively, in a cross section of the ceramic body taken in length and thickness directions, 50%<
Lo/Le×
100 and 30%<
to/te×
100<
80% are satisfied.
1 Assignment
0 Petitions
Accused Products
Abstract
A multilayer ceramic capacitor includes: a ceramic body having laminated dielectric layers having an average thickness of 0.2-2.0 μm; an active layer including first and second internal electrodes alternately exposed through end surfaces of the ceramic body having the dielectric layer interposed therebetween and contributing to capacitance formation; upper and lower cover layers respectively formed above and below the active layer, the lower cover layer being thicker than the upper cover layer; first and second external electrodes covering the end surfaces of the ceramic body, wherein a bottommost internal electrode adjacent to the lower cover layer has an oxide layer formed on at least one of top and bottom surfaces thereof, and when lengths and thicknesses of the bottommost internal electrode and the oxide layer are denoted by ‘Le,’ ‘te’ and ‘Lo,’ ‘to’, respectively, in a cross section of the ceramic body taken in length-thickness direction, 50%<Lo/Le×100 and 30%<to/te×100<80% are satisfied.
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Citations
14 Claims
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1. A multilayer ceramic capacitor, comprising:
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a ceramic body having a plurality of dielectric layers laminated therein, the dielectric layers respectively having an average thickness of 0.2 to 2.0 μ
m;an active layer including a plurality of first and second internal electrodes alternately exposed through both end surfaces of the ceramic body having the dielectric layer interposed therebetween and contributing to capacitance formation; an upper cover layer formed above the active layer; a lower cover layer formed below the active layer, the lower cover layer being thicker than the upper cover layer; and first and second external electrodes covering the end surfaces of the ceramic body, wherein a bottommost internal electrode adjacent to the lower cover layer has an oxide layer formed on at least one of top and bottom surfaces thereof, and when a length and a thickness of the bottommost internal electrode are denoted by Le and te, respectively, and a length and a thickness of the oxide layer are denoted by Lo and to, respectively, in a cross section of the ceramic body taken in length and thickness directions, 50%<
Lo/Le×
100 and 30%<
to/te×
100<
80% are satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A mounting board having a multilayer ceramic capacitor mounted thereon, the mounting board comprising:
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a printed circuit board having first and second electrode pads formed thereon; and a multilayer ceramic capacitor mounted on the printed circuit board, wherein the multilayer ceramic capacitor includes; a ceramic body having a plurality of dielectric layers laminated therein, the dielectric layers respectively having an average thickness of 0.2 to 2.0 μ
m;an active layer including a plurality of first and second internal electrodes alternately exposed through both end surfaces of the ceramic body having the dielectric layer interposed therebetween and contributing to capacitance formation; an upper cover layer formed above the active layer; a lower cover layer formed below the active layer, the lower cover layer being thicker than the upper cover layer; and first and second external electrodes covering both end surfaces of the ceramic body while being connected to the first and second electrode pads through soldering, and wherein a bottommost internal electrode adjacent to the lower cover layer has an oxide layer formed on at least top and bottom surfaces thereof, and when a length and a thickness of the bottommost internal electrode are denoted by Le and te, respectively, and a length and a thickness of the oxide layer are denoted by Lo and to, respectively, in a cross section of the ceramic body taken in length and thickness directions, 50%<
Lo/Le×
100 and 30%<
to/te×
100<
80% are satisfied. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification