US 12,080,481 B2
Multi-layer ceramic electronic component and circuit board
Satoshi Kobayashi, Tokyo (JP); Kiyoshiro Yatagawa, Tokyo (JP); and Takahisa Fukuda, Tokyo (JP)
Assigned to TAIYO YUDEN CO., LTD., Tokyo (JP)
Filed by TAIYO YUDEN CO., LTD., Tokyo (JP)
Filed on Aug. 2, 2022, as Appl. No. 17/879,276.
Claims priority of application No. 2021-166169 (JP), filed on Oct. 8, 2021.
Prior Publication US 2023/0114467 A1, Apr. 13, 2023
Int. Cl. H01G 4/232 (2006.01); H01G 4/12 (2006.01); H01G 4/248 (2006.01); H01G 4/30 (2006.01)
CPC H01G 4/2325 (2013.01) [H01G 4/1245 (2013.01); H01G 4/248 (2013.01); H01G 4/30 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multi-layer ceramic electronic component, comprising:
a ceramic body including
a pair of main surfaces perpendicular to a first axis,
a pair of end surfaces perpendicular to a second axis orthogonal to the first axis,
a pair of side surfaces perpendicular to a third axis orthogonal to the first axis and the second axis, and
a plurality of internal electrodes drawn to the pair of end surfaces,
the ceramic body having a substantially rectangular parallelepiped shape, and
a pair of external electrodes each including
a base layer that covers one of the pair of end surfaces,
a conductive resin layer that includes a thermosetting resin and a plurality of conductive fillers scattered in the thermosetting resin and covers the base layer,
a first conductive layer disposed on the conductive resin layer, and
a second conductive layer including tin as a main component and disposed on the first conductive layer,
the pair of external electrodes each extending along one of the pair of main surfaces from the end surface, wherein
the base layer includes a base end portion located inward in a direction of the second axis on the main surface,
the conductive resin layer includes an extended portion extending inward in the direction of the second axis from the base end portion on the main surface,
the conductive fillers each include a core portion and a silver coating film that is made of silver and covers the core portion, and
in a cross-section that passes through the center portion of each of the pair of external electrodes in a direction of the third axis and is parallel to the first axis and the second axis, when a virtual straight line parallel to a direction of the first axis is drawn to pass through a range distant from the base end portion inward in the direction of the second axis by ½ or more and ⅔ or less of a dimension of the extended portion in the direction of the second axis, and when a thickness of the first conductive layer along the straight line is regarded as a conductor thickness, and the sum of lengths of the silver coating film along the straight line in all the conductive fillers through which the straight line passes, is regarded as a total thickness of silver coating, a ratio of the conductor thickness to the total thickness of silver coating is 2 or more and 10 or less.