US 12,191,086 B2
Multilayer ceramic electronic device and manufacturing method of the same
Yuji Tsushima, Tokyo (JP); Yasuhiro Matsumoto, Tokyo (JP); and Koichiro Morita, Tokyo (JP)
Assigned to TAIYO YUDEN CO., LTD., Tokyo (JP)
Filed by TAIYO YUDEN CO., LTD., Tokyo (JP)
Filed on Feb. 27, 2023, as Appl. No. 18/114,539.
Claims priority of application No. 2022-037359 (JP), filed on Mar. 10, 2022.
Prior Publication US 2023/0290577 A1, Sep. 14, 2023
Int. Cl. H01G 4/30 (2006.01); H01G 4/012 (2006.01); H01G 4/248 (2006.01)
CPC H01G 4/302 (2013.01) [H01G 4/012 (2013.01); H01G 4/248 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multilayer ceramic device comprising:
a multilayer chip that has a multilayer portion in which a plurality of dielectric layers and a plurality of internal electrode layers are alternately stacked, a main component of the plurality of dielectric layers being a ceramic having a perovskite structure represented by a general formula ABO3 having an A site and a B site, the plurality of internal electrode layers being arranged so as to be alternately exposed on two opposing end faces of the multilayer chip, and has an upper face and a lower face in a stacking direction and two side faces in addition to the two end faces,
wherein the multilayer chip has a capacity section, a side margin and an intermediate portion, the capacity section having a structure in which internal electrode layers connected to different end faces face each other, the side margin covering end portions of the plurality of dielectric layers and the plurality of internal electrode layers on ends on the side of the two side faces, a main component of the side margin being a ceramic having a perovskite structure represented by a general formula ABO3 having an A site and a B site, the intermediate portion being provided between the capacity section and the side margin, a main component of the intermediate portion being a ceramic having a perovskite structure represented by a general formula ABO3, and
wherein an A/B ratio is larger in the side margin than in the capacity section, and is smaller in the intermediate portion than in the capacity section.