US 12,272,478 B2
Common mode choke coil
Kenji Tanaka, Nagaokakyo (JP); and Naoyuki Murakami, Nagaokakyo (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed on Jun. 1, 2021, as Appl. No. 17/336,218.
Claims priority of application No. 2020-103932 (JP), filed on Jun. 16, 2020.
Prior Publication US 2021/0391107 A1, Dec. 16, 2021
Int. Cl. H01F 5/00 (2006.01); H01F 17/00 (2006.01); H01F 27/28 (2006.01); H01F 27/29 (2006.01)
CPC H01F 17/0013 (2013.01) [H01F 27/2804 (2013.01); H01F 27/292 (2013.01); H01F 2017/0073 (2013.01); H01F 2017/0093 (2013.01); H01F 2027/2809 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A common mode choke coil comprising:
an element body including a plurality of electrically insulating layers laminated in a height direction;
a first coil, provided in the element body, and including a first coil conductor provided on a surface of a first electrically insulating layer, a second coil conductor provided on a surface of a second electrically insulating layer, and a third coil conductor provided on a surface of a third electrically insulating layer, such that the first coil conductor, the second coil conductor, and the third coil conductor are laminated in the height direction together with the first electrically insulating layer, the second electrically insulating layer, and the third electrically insulating layer and electrically connected, and the second coil conductor and the third coil conductor are electrically connected via a first outer via conductor provided at a position that overlaps partially or totally a radially outer end of the second coil conductor and a radially outer end of the third coil conductor when viewed in the height direction;
a second coil provided in the element body and electrically insulated from the first coil, the second coil including a fourth coil conductor provided on a surface of a fourth electrically insulating layer, a fifth coil conductor provided on a surface of a fifth electrically insulating layer, and a sixth coil conductor provided on a surface of a sixth electrically insulating layer, such that the fourth coil conductor, the fifth coil conductor, and the sixth coil conductor are laminated in the height direction together with the fourth electrically insulating layer, the fifth electrically insulating layer, and the sixth electrically insulating layer and electrically connected;
a first outer electrode provided on a surface of the element body and electrically connected to one end of the first coil;
a second outer electrode provided on the surface of the element body and electrically connected to an other end of the first coil;
a third outer electrode provided on the surface of the element body and electrically connected to one end of the second coil;
a fourth outer electrode provided on the surface of the element body and electrically connected to an other end of the second coil; and
a first dummy conductor provided on the surface of at least one of the electrically insulating layers, consisting of the first electrically insulating layer, the fourth electrically insulating layer, the fifth electrically insulating layer, and the sixth electrically insulating layer, provided at a position other than between the second electrically insulating layer and the third electrically insulating layer, the first dummy conductor overlaps partially or totally the first outer via conductor when viewed in the height direction and is electrically insulated from all the coil conductors.