Coil component and electronic device

• US 20060267719A1
• Filed: 05/17/2006
• Published: 11/30/2006
• Est. Priority Date: 05/27/2005
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Yasuda, Masatoshi, Kudo, Shin, Suzuki, Hiroshi, Kobayashi, Katsumi
• Granted Patent: US 7,312,682 B2
• Time in Patent Office: Days
• US Class Current: 336/223
• 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 2017/0093 Common mode choke coil
• CPC Class Codes: H01F 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings
• CPC Class Codes: H05K 2201/10628 Leaded surface mounted device soldering surface mounted leaded components H05K3/3421
• CPC Class Codes: H05K 3/321 by conductive adhesives

Abstract

A coil component comprises a core element having a mounting portion, a coil conductor placed on the core element, and at least two terminal electrodes which are placed in the mounting portion. The mounting portion has at least two terminal placement areas for placing the terminal electrodes respectively. A hollow portion opening to the mounting side face of the mounting portion is formed in an area between the at least two terminal placement areas in the mounting portion. When mounting the coil component on a circuit board, conductive paste is intervened between an area from the terminal electrodes placed in the mounting portion of the core element to the base exposed area of the mounting portion, and the electrode patterns on the circuit board.

Claims

1. A coil component, comprising:

a core element having a mounting portion;

at least one coil conductor placed on said core element; and

at least two terminal electrodes which are placed in said mounting portion and are electrically connected to said at least one coil conductor, wherein

said mounting portion has at least two terminal placement areas for placing said at least two terminal electrodes, and a hollow portion opening to the mounting side face of said mounting portion is formed in an area between said at least two terminal placement areas in said mounting portion.

2. The coil component according to claim 1, wherein said core element further comprises a core portion fixed to said mounting portion, and said coil conductor is a coil wound around said core portion.

3. The coil component according to claim 1, wherein when the length from said terminal electrode to said hollow portion is A and the width of said hollow portion is B in said mounting portion, a relationship A/2≦

B≦

A is satisfied.

4. The coil component according to claim 1, wherein the height position on the mounting side face of said terminal placement area in said mounting portion is substantially higher than the height position of the mounting side face of an area between said at least two terminal placement areas in said mounting portion, by the thickness of said terminal electrode.

5. The coil component according to claim 2, wherein said core element has a pair of flange portions positioned at both ends of said core portion, and said pair of flange portions constitute said mounting portion.

6. The coil component according to claim 2, wherein said core element further comprises a first core which has said core portion and a pair of flange portions positioned at both ends of said core portion, and a second core positioned in said first core so as to surround said first core, and said second core constitutes said mounting portion.

7. The coil component according to claim 2, wherein said core element has an upper flange portion and a lower flange portion which are positioned at both ends of said core portion, and said lower flange portion constitutes said mounting portion.

8. The coil component according to claim 1, wherein said terminal electrode is a terminal metal fitting which is attached in said terminal placement area of said mounting portion.

9. The coil component according to claim 1, wherein said terminal electrode is a plated electrode formed on the surface of said terminal placement area of said mounting portion.

10. An electronic device, comprising:

a circuit board; and

a coil component which is mounted on said circuit board by conductive paste, wherein

said coil component comprises a core element having a mounting portion, at least one coil conductor placed in said core element, and at least two terminal electrodes which are placed in said mounting portion and are electrically connected to said at least one coil conductor,

said mounting portion has at least two terminal placement areas for placing said at least two terminal electrodes, and

a hollow portion opening to the mounting side face of said mounting portion is formed in an area between said at least two terminal placement areas in said mounting portion.