Coil component and method for manufacturing same

• US 9,978,506 B2
• Filed: 06/30/2015
• Issued: 05/22/2018
• Est. Priority Date: 07/07/2014
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Ohtsubo, Mutsuyasu, Wakamori, Ikuya
• Primary Examiner(s): Chan, Tsz
• Application Number:
  US15/300,017
• Publication Number:
  US 20170186531A1
• Time in Patent Office: 1,057 Days
• Field of Search: 336 65, 336 83, 336 90, 336192, 336200, 336221, 336232
• CPC Class Codes: H01F 2017/048 with encapsulating core, e.g. made of resin and magnetic powder
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence
• CPC Class Codes: H01F 27/26 Fastening parts of the core together; Fastening or mounting the core on casing or support on coil H01F27/30
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/2828 Construction of conductive connections, of leads
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 41/0246 Manufacturing of magnetic circuits by moulding or by pressing powder magnetic cores made by moulding or by pressing powder H01F27/255; soft magnetic particles H01F1/20, H01F1/36
• CPC Class Codes: H01F 41/10 Connecting leads to windings making electric connections in general H01R43/00

Abstract

A coil component of the present invention includes a magnetic core containing magnetic powder, a coil element embedded in the magnetic core and having an end projecting from the magnetic core, and a retaining member for retaining the end of the coil element. The retaining member has a main surface having a recess therein sinking toward the magnetic core. The retaining member has a ridge projecting from a bottom surface of the recess and extending linearly along the bottom surface. The ridge has a portion that intersects with the end of the coil element. The portion of the ridge is welded to the end of the coil element.

Claims

1. A coil component comprising:

a magnetic core containing magnetic powder;

a coil element embedded in the magnetic core, the coil element having has an end projecting from the magnetic core, the end of the coil element extending in a first direction; and

a retaining member for retaining the end of the coil element,

wherein the retaining member has a main surface having a recess therein sinking toward the magnetic core,

wherein the retaining member has a ridge projecting from a bottom surface of the recess in a predetermined direction and extending linearly along the bottom surface in a second direction,

wherein the end of the coil element contacts a tip end portion of the ridge in the predetermined direction, and the end of the coil element is welded to the ridge at the tip end portion of the ridge, and

wherein the first direction and second direction intersect with one another.

2. The coil component according to claim 1, wherein the ridge is provided in the recess.

3. The coil component according to claim 1, wherein the retaining member has a first slit and a second slit arranged such that the end of the coil element and the ridge are provided between the first slit and the second slit.

4. The coil component according to claim 3,

wherein the recess has a first step portion and a second step portion which are connected to the main surface of the retaining member and the bottom surface of the recess,

wherein the first slit passes in along the first step portion of the recess, and

wherein the second slit passes in along the second step portion of the recess.

5. The coil component according to claim 3,

wherein the first slit has a first portion and a second portion, the first portion of the first slot having a first width, the second portion of the first slit having a second width larger than the first width,

wherein a distance between a position at which the end of the coil element projects from the magnetic core and the first portion of the first slit is larger than a distance between the position and the second portion of the first slit,

wherein the second slit has a third portion and a fourth portion, the third portion of the second slit having a third width, the fourth portion of the second slit having a fourth width larger than the third width, and

wherein a distance between the position and the third portion of the second slit is larger than a distance between the position and the fourth portion of the second slit.

6. The coil component according to claim 5,

wherein the first portion of the first slit includes one of both ends of the first slit, and the second portion includes another of the both ends of the first slit,

wherein a width of the first slit monotonically increases from the first portion to the second portion of the first slit,

wherein the third portion of the second slit includes one of both ends of the second slit, and the fourth portion includes another of the both ends of the second slit, and

wherein a width of the second slit monotonically increases from the third portion to the fourth portion of the second slit.

7. The coil component according to claim 3, wherein the retaining member has a third slit between the first slit and the second slit, the third slit extends in a direction in which the end of the coil element extends.

8. The coil component according to claim 7, wherein the recess has a step portion connected to the main surface of the retaining member and the bottom surface of the recess, and wherein the third slit passes in along the step portion of the recess.

9. The coil component according to claim 1, wherein the predetermined direction is substantially perpendicular to the bottom surface of the recess.

10. A method for manufacturing a coil component, comprising:

providing a coil element including a wound lead wire having an end, the end of the coil element extending in a first direction;

providing a retaining member made of a flat metal plate having a recess therein, the retaining member having a ridge projecting from a bottom surface of the recess in a predetermined direction and extending linearly along the bottom surface in a second direction;

disposing the retaining member and the coil element such that a tip end portion of the ridge in a predetermined direction contacts the end of the coil element;

welding the tip end portion of the ridge with the end of the coil element; and

pressure molding a magnetic core made of a magnetic material while the coil element is embedded in the magnetic core,

wherein the first direction and the second direction intersect with one another.

11. The method according to claim 10, further comprising bending the retaining member.

12. The method according to claim 10, wherein the retaining member has a first slit and a second slit arranged such that the end of the coil element and the ridge are disposed between the first slit and the second slit.

13. The method according to claim 12,

wherein the first slit passes in along a first step portion of the recess connected to the main surface of the retaining member and the bottom surface of the recess, and

wherein the second slit passes in along a second step portion of the recess connected to the main surface of the retaining member and the bottom surface of the recess.

14. The method according to claim 12, wherein the retaining member has a third slit between the first slit and the second slit, the third slit extending in a direction in which the end of the coil element extends.

15. The method according to claim 14, wherein the third slit passes in along a third step portion of the recess connected to the main surface of the retaining member and the bottom surface of the recess.

16. The method according to claim 10, wherein the predetermined direction is substantially perpendicular to the bottom surface of the recess.