US 12,260,987 B2
Method of manufacturing coil component
Takayuki Arai, Tokyo (JP); and Tomoo Kashiwa, Tokyo (JP)
Assigned to Taiyo Yuden Co., Ltd., Tokyo (JP)
Filed by TAIYO YUDEN CO., LTD., Tokyo (JP)
Filed on Mar. 19, 2024, as Appl. No. 18/609,705.
Application 18/609,705 is a continuation of application No. 17/566,989, filed on Dec. 31, 2021, granted, now 11,996,233.
Claims priority of application No. 2021-020895 (JP), filed on Feb. 12, 2021.
Prior Publication US 2024/0222007 A1, Jul. 4, 2024
Int. Cl. H01F 41/04 (2006.01); B22F 1/16 (2022.01); H01F 1/26 (2006.01); H01F 17/04 (2006.01); H01F 27/28 (2006.01); H01F 27/29 (2006.01); H01F 41/02 (2006.01)
CPC H01F 41/04 (2013.01) [B22F 1/16 (2022.01); H01F 1/26 (2013.01); H01F 17/04 (2013.01); H01F 27/2852 (2013.01); H01F 27/292 (2013.01); H01F 41/0246 (2013.01); B22F 2998/10 (2013.01); B22F 2999/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of manufacturing a coil component, comprising steps of:
providing an intermediate body, the providing of the intermediate body including (i) preparing a base material having a flat plate shape or a wire shape, (ii) bending the base material to form a conductor portion, (iii) preparing a metal magnetic paste containing a resin and a plurality of metal magnetic particles mainly composed of iron, and (iv) applying a molding pressure to the metal magnetic paste covering the base material to form the intermediate body including a substrate body containing the plurality of metal magnetic particles and the conductor portion;
heating the intermediate body at a first temperature ranging from 100 to 350° C.; and
after the heating at the first temperature, heating the intermediate body at a second temperature higher than the first temperature to anneal the conductor portion and to form a magnetic base body from the substrate body, the second temperature ranging from 600 to 900° C.,
wherein the magnetic base body includes an oxide coating film containing iron oxide on a surface of each of the metal magnetic particles.