US 12,266,466 B2
Coil device, pulse transformer, and electronic component
Kouyu Ohi, Tsuruoka (JP); Tasuku Mikogami, Tokyo (JP); Shuhei Someya, Tokyo (JP); and Yusuke Kimoto, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Nov. 29, 2022, as Appl. No. 18/071,098.
Application 18/071,098 is a continuation of application No. 16/577,286, filed on Sep. 20, 2019, granted, now 11,545,294.
Claims priority of application No. 2018-190333 (JP), filed on Oct. 5, 2018.
Prior Publication US 2023/0093320 A1, Mar. 23, 2023
Int. Cl. H01F 27/29 (2006.01); H01F 27/24 (2006.01); H01F 27/28 (2006.01)
CPC H01F 27/2823 (2013.01) [H01F 27/24 (2013.01); H01F 27/29 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A coil device comprising:
a core member having a winding core and a flange;
a wire wound around the winding core; and
a terminal electrode provided to the flange and connected with a lead of the wire, wherein
the terminal electrode is a preformed metal board member,
an easy bonding layer is formed in a stripe form to a surface of the terminal electrode connected with the lead,
the terminal electrode includes, in order, a substrate, an underlayer and at least one layer above the underlayer,
the easy bonding layer is formed in an outermost layer included in the at least one layer above the underlayer of the terminal electrode, and
the underlayer is not exposed to an outermost surface of the terminal electrode.