COIL COMPONENT

• US 20180019046A1
• Filed: 06/06/2017
• Published: 01/18/2018
• Est. Priority Date: 07/15/2016
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: MIYAMOTO, Masashi
• Granted Patent: US 10,483,027 B2
• Time in Patent Office: Days
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 17/045 with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence
• CPC Class Codes: H01F 27/263 Fastening parts of the core together
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances
• CPC Class Codes: H01F 3/14 Constrictions; Gaps, e.g. air-gaps in magnetic shunt paths H01F3/12
• CPC Class Codes: H01F 41/04 for manufacturing coils coils for transformer or inductances H01F27/28
• CPC Class Codes: H01F 41/06 Coil winding
• CPC Class Codes: H01F 41/10 Connecting leads to windings making electric connections in general H01R43/00

Abstract

A coil component includes a drum-shaped core having first and second flange portions and a plate-shaped core. The top surface of each of the flange portions has a convex curved surface. At least four protrusions are provided between the lower main surface of the plate-shaped core and the top surfaces of the flange portions and contact with the lower main surface and the top surfaces of the flange portions.

Claims

1. A coil component comprising:

a substantially drum-shaped core including a winding core portion and first and second flange portions, which are formed at opposite end portions of the winding core portion;

a substantially plate-shaped core having a lower main surface and an upper main surface, which face opposite directions, the substantially plate-shaped core extending across the first and second flange portions;

at least one first terminal electrode formed on the first flange portion;

at least one second terminal electrode formed on the second flange portion; and

at least one wire wound around the winding core portion and connected to the first terminal electrode and the second terminal electrode,

wherein each of the first and second flange portions has an inner end surface, which faces the winding core portion and on which a corresponding one of the end portions of the winding core portion is disposed, an outer end surface, which is opposite to the inner end surface and which faces outward, a bottom surface, which connects the inner end surface and the outer end surface and which faces a mounting substrate when the coil component is mounted on the mounting substrate, and a top surface, which is opposite to the bottom surface,

wherein the top surface of each of the first and second flange portions has a convex curved surface,

wherein the lower main surface faces the top surfaces of the first and second flange portions,

wherein at least two protrusions are provided between the lower main surface and the top surface of the first flange portion and contact with both of the lower main surface and the top surface of the first flange portions, and

wherein at least two protrusions are provided between the lower main surface and the top surface of the second flange portion and contact with both of the lower main surface and the top surface of the second flange portion.

2. The coil component according to claim 1,

wherein all the protrusions are formed on the substantially plate-shaped core.

3. The coil component according to claim 1,

wherein the lower main surface has a substantially rectangular shape, and

wherein four of the protrusions are positioned at four corners of the lower main surface.

4. The coil component according to claim 1,

wherein, when viewed in a see-through manner from the upper main surface toward the bottom surfaces, the protrusions are located outside extension lines of outlines of the winding core portion, the extension lines extending into the flange portions.

5. The coil component according to claim 1,

wherein a height of each of the protrusions is substantially equal to a difference in a height of each of the top surfaces due to the corresponding curved surface.

6. The coil component according to claim 1,

wherein a height of each of the protrusions is larger than a difference in a height of each of the top surfaces due to the corresponding curved surface by about 10 μ

m or more.

7. The coil component according to claim 6,

wherein a contact area between the protrusions and one of the lower main surface and the top surface of the first flange portion is not more than about one-fiftieth an overlapped area where the lower main surface and the top surface of the first flange portion overlapped each other.