US 12,462,969 B2
Coil component
Hideaki Hoshino, Tokyo (JP); Kenji Okabe, Tokyo (JP); and Kozue Imaizumi, Tokyo (JP)
Assigned to TAIYO YUDEN CO., LTD., Tokyo (JP)
Filed by TAIYO YUDEN CO., LTD., Tokyo (JP)
Filed on May 25, 2021, as Appl. No. 17/330,014.
Claims priority of application No. 2020-093778 (JP), filed on May 28, 2020.
Prior Publication US 2021/0375528 A1, Dec. 2, 2021
Int. Cl. H01F 5/00 (2006.01); H01F 27/06 (2006.01); H01F 27/28 (2006.01); H01F 27/29 (2006.01); H01F 41/04 (2006.01)
CPC H01F 27/29 (2013.01) [H01F 27/06 (2013.01); H01F 27/2804 (2013.01); H01F 41/041 (2013.01); H01F 2027/2809 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A coil component comprising:
an insulating base body having a top surface and a bottom surface;
a single coil conductor disposed in the base body, the single coil conductor having a first coil surface opposed to the top surface and a second coil surface opposed to the bottom surface;
a reinforcement portion made of a metal material and disposed in the base body at a position closer to the bottom surface than is a middle point between the bottom surface and the second coil surface;
a first external electrode electrically connected with one end of the single coil conductor and having a first bottom portion contacting at least with the bottom surface of the base body; and
a second external electrode electrically connected with the other end of the single coil conductor and having a second bottom portion contacting at least with the bottom surface of the base body,
wherein an interval between the second coil surface of the single coil conductor and the bottom surface is larger than an interval between the first coil surface of the single coil conductor and the top surface,
wherein the base body includes a first region and a second region, the first region covers the single coil conductor, and the second region is disposed between the reinforcement portion and the bottom surface and has a higher Vickers hardness than the first region, wherein the reinforcement portion extends parallel to the bottom surface, wherein the second region extends parallel to the bottom surface, and wherein the reinforcement portion and the second region are arranged in an axis direction extending perpendicular to the bottom surface, and
wherein the first bottom portion of the first external electrode and the second bottom portion of the second external electrode are in contact with the second region; wherein the second region contains nonmagnetic materials, the nonmagnetic materials including silica and alumina.