US 9,812,261 B2
Multilayer ceramic capacitor
Daiki Fukunaga, Nagaokakyo (JP); Hideaki Tanaka, Nagaokakyo (JP); and Koji Moriyama, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto-fu (JP)
Filed on Jan. 26, 2017, as Appl. No. 15/415,989.
Application 15/415,989 is a continuation of application No. 14/711,975, filed on May 14, 2015, granted, now 9,633,788.
Claims priority of application No. 2014-105588 (JP), filed on May 21, 2014; and application No. 2015-075012 (JP), filed on Apr. 1, 2015.
Prior Publication US 2017/0148572 A1, May 25, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. H01G 4/30 (2006.01); H01G 4/012 (2006.01); H01G 4/12 (2006.01); H01G 4/248 (2006.01)
CPC H01G 4/30 (2013.01) [H01G 4/012 (2013.01); H01G 4/1227 (2013.01); H01G 4/248 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A multilayer ceramic capacitor comprising:
a ceramic body including a first end surface and a second end surface opposite to the first end surface, a first side surface and a second side surface perpendicular or substantially perpendicular to the first end surface and the second end surface, and a first major surface and a second major surface perpendicular or substantially perpendicular to the first end surface and the first side surface, and including a plurality of dielectric ceramic layers of a perovskite-type compound containing Ba and Ti, and internal electrode layers stacked on one another in a direction extending from the first major surface to the second major surface with a respective one of the plurality of dielectric ceramic layer between each adjacent pair of the internal electrodes; and
external electrodes provided on the ceramic body at the first end surface and the second end surface, respectively; wherein
the internal electrodes includes a first internal electrode and a second internal electrode;
each of the first internal electrode and the second internal electrode extends out to a respective one of the first end surface and the second end surface, and is electrically connected to a respective one of the external electrodes;
when the ceramic body is seen in a direction in which the layers are stacked, the ceramic body includes a region free of the first internal electrode and the second internal electrode defining a side margin portion;
a first outer layer portion is provided between a first outermost internal electrode of the internal electrodes and the first major surface;
a second outer layer portion is provided between a second outermost internal electrode of the internal electrodes and the second major surface;
opposed sides of the first and second outer layer portions are covered by the side margin portion;
the side margin portion covering the opposed sides of the first and second outer layer portions includes pores that decrease in number along a direction extending from inside to outside of the ceramic body; and
the side margin portion includes an inner portion adjacent to the internal electrode and an outer portion located at the side surfaces of the ceramic body, and the inner portion is smaller in thickness than the outer portion.