US 12,249,459 B2
Multilayer ceramic capacitor
Satoshi Yokomizo, Nagaokakyo (JP); and Toshihiro Harada, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Feb. 8, 2024, as Appl. No. 18/436,162.
Application 18/436,162 is a continuation of application No. 18/121,629, filed on Mar. 15, 2023, granted, now 11,929,208.
Application 18/121,629 is a continuation of application No. 16/822,065, filed on Mar. 18, 2020, granted, now 11,631,537, issued on Apr. 18, 2023.
Claims priority of application No. 2019-064074 (JP), filed on Mar. 28, 2019.
Prior Publication US 2024/0177931 A1, May 30, 2024
Int. Cl. H01G 4/12 (2006.01); H01G 4/008 (2006.01); H01G 4/012 (2006.01); H01G 4/232 (2006.01); H01G 4/30 (2006.01)
CPC H01G 4/1227 (2013.01) [H01G 4/012 (2013.01); H01G 4/2325 (2013.01); H01G 4/008 (2013.01); H01G 4/30 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A multilayer ceramic capacitor comprising:
a laminate including a dielectric ceramic layer and an internal electrode layer that are laminated in a lamination direction; and
an external electrode connected to the internal electrode layer; wherein
the laminate includes a first main surface and a second main surface that oppose each other in the lamination direction, a first lateral surface and a second lateral surface that oppose each other in a width direction intersecting the lamination direction, and a first end surface and a second end surface that oppose each other in a length direction intersecting the lamination direction and the width direction;
the external electrode is disposed on the first end surface and the second end surface, respectively;
the laminate includes a central layer portion which is a region sandwiched by an internal electrode layer closest to the first main surface and an internal electrode layer closest to the second main surface along the lamination direction, a peripheral layer portion sandwiching the central layer portion in the lamination direction, and a side margin sandwiching the central layer portion in the width direction;
the internal electrode layer includes a first internal electrode layer extending to the first end surface, and a second internal electrode layer extending to the second end surface so as to oppose the first internal electrode layer with the dielectric ceramic layer therebetween;
the external electrode includes a first external electrode disposed on the first end surface and connected to the first internal electrode layer, and a second external electrode disposed on the second end surface and connected to the second internal electrode layer;
the first external electrode extends from the first end surface of the laminate over a portion of one or both of the first main surface and the second main surface;
when viewing the laminate through a cross-section parallel or substantially parallel to the width direction and the lamination direction at a central or substantially central portion in the length direction of the first external electrode disposed on the first main surface or the second main surface of the laminate, a region where the first main surface or the second main surface meets the first lateral surface or the second lateral surface in the laminate is defined as a corner portion, a maximum value of a dimension in the width direction of the side margin is represented by W1, a maximum value of a dimension in the lamination direction of the peripheral layer portion is represented by T1, and a distance from an end portion in the width direction of an internal electrode layer closest to the first main surface or the second main surface of the laminate to the corner portion of the laminate is represented by R1, W1>R1 is satisfied and T1>R1 is satisfied; and
at at least one corner portion of the laminate, the first internal electrode layer closest to the first main surface or the second main surface of the laminate is connected to the first external electrode.