IP Library › Granted Patent US 12683059
Granted Patent B2
US 12683059 · App. 18/178,735 · Granted Jul 14, 2026

Coil device

Inventors: Masaru Kumagai (Tokyo, JP); Tomohiro Furuichi (Tokyo, JP); Satoshi Denda (Tokyo, JP)
Assignee: TDK CORPORATION
H01F27/22H01F27/24H01F27/325
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 12683059
App. No.
18/178,735
Granted
Jul 14, 2026
Kind
B2
Abstract

A coil device 1 comprises a second bobbin 20 provided with a second coil 92 ; cores 30 b and 30 c attached to the second bobbin 20 ; a case 40 accommodating the second bobbin 20 and the cores 30 b and 30 c ; and a heat dissipating resin 100 filling the case 40 . The case 40 comprises a case body 41 covering the second bobbin 20 with the cores 30 b and 30 c from above and from below and having an opening 42 that is opened laterally. The second bobbin 20 comprises protrusions 24 protruding from the case body 41 through the opening 42.

Claims (59)

1 . A coil device comprising:

a bobbin provided with a coil;

a core attached to the bobbin;

a case accommodating the bobbin and the core; and

a heat dissipating resin filling the case;

wherein

the case comprises a case body covering the bobbin with the core from above and from below and having an opening that is opened laterally;

the bobbin comprises a protrusion protruding from the case body through the opening;

the protrusion comprises a guide portion that guides a leadout portion of the coil towards a predetermined direction; and

when viewed in a direction perpendicular to the opening, the leadout portion passes through the guide portion along a direction perpendicular to both an axial direction of the bobbin and a protruding direction of the protrusion.

2 . The coil device according to claim 1 , wherein

the case body covers the bobbin except at the opening; and

the protrusion protrudes in one direction from the case body through the opening.

3 . The coil device according to claim 1 , wherein

the guide portion comprises a guide path extending in the vicinity of the opening and parallel to a bottom surface of the case.

4 . The coil device according to claim 3 , wherein

a stopper is attached to the guide portion; and

the stopper covers at least part of the guide path from a direction substantially orthogonal to an extending direction of the leadout portion.

5 . The coil device according to claim 1 , wherein

the guide portion made separately from the bobbin is attached to the protrusion.

6 . The coil device according to claim 1 , wherein

the coil comprises a first coil including a first wire and a second coil including a second wire;

the bobbin comprises a first bobbin provided with the first coil and a second bobbin provided with the second coil;

the first bobbin comprises a first protrusion protruding from the case body through the opening; and

the second bobbin comprises a second protrusion protruding from the case body through the opening.

7 . The coil device according to claim 2 , wherein

the coil comprises a first coil including a first wire and a second coil including a second wire;

the bobbin comprises a first bobbin provided with the first coil and a second bobbin provided with the second coil;

the first bobbin comprises a first protrusion protruding from the case body through the opening; and

the second bobbin comprises a second protrusion protruding from the case body through the opening.

8 . The coil device according to claim 1 , wherein

the coil comprises a flat coil having a flat wire; and

a leadout portion of the flat coil protrudes from the case body through the opening and is fixed to the protrusion.

9 . A coil device comprising:

a bobbin provided with a coil;

a core attached to the bobbin;

a case accommodating the bobbin and the core; and

a heat dissipating resin filling the case;

wherein

the case comprises a case body covering the bobbin with the core from above and from below and having an opening that is opened laterally;

the bobbin comprises a protrusion protruding from the case body through the opening;

the coil comprises a first coil including a first wire and a second coil including a second wire;

the bobbin comprises a first bobbin provided with the first coil and a second bobbin provided with the second coil;

the first bobbin comprises a first protrusion protruding from the case body through the opening; and

the second bobbin comprises a second protrusion protruding from the case body through the opening.

10 . A coil device comprising:

a bobbin provided with a coil;

a core attached to the bobbin;

a case accommodating the bobbin and the core; and

a heat dissipating resin filling the case;

wherein

the case comprises a case body covering the bobbin with the core from above and from below and having an opening that is opened laterally;

the bobbin comprises a protrusion protruding from the case body through the opening;

the case body covers the bobbin except at the opening;

the protrusion protrudes in one direction from the case body through the opening;

the coil comprises a first coil including a first wire and a second coil including a second wire;

the bobbin comprises a first bobbin provided with the first coil and a second bobbin provided with the second coil;

the first bobbin comprises a first protrusion protruding from the case body through the opening; and

the second bobbin comprises a second protrusion protruding from the case body through the opening.