JPH08186035A - Coil component - Google Patents

Abstract

PURPOSE: To lessen the area, which is occupied by a common-mode choke coil, in a printed board or the like by a method wherein four electrodes are provided in roughly parallel to each other on the bottom of the lower flange part of a core and the end parts of two wire materials are respectively connected electrically with the electrode different from each other. CONSTITUTION: A common-mode choke coil 15 is constituted of a core 1 and two wire materials 11 and 12. The core 1 consists of a drum part 2 and flange parts 3 and 4, which are respectively provided on both ends of this drum part 2. The drum part 2 is formed into a rectangle-shaped section. Strip electrodes 5, 6, 7 and 8 to reach from the edge part on this side of the flange part 4 to the edge part on the depth side of the flange part 4 are provided side by side in parallel to each other on the bottom of the flange part 4. In the coil 15, the four electrodes 5 to 8 are juxtaposed in parallel to each other on the bottom of the flange part 4 and there is no need to set an insulating space in the longitudinal directions of the electrodes 5 to 8. Accordingly, the size L1 of the flange part 4 becomes equal to the length of the electrodes 5 to 8 and the area, which is occupied by the coil 15, in a printed board or the like can be lessened compared with that of a conventional choke coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil component, particularly a coil component used as a choke coil or a transformer.

[0002]

2. Description of the Related Art As shown in FIG.
0 is composed of a core 31 and two wire rods 41 and 42. The core 31 includes a body portion 32 and collar portions 33 and 34 provided at both ends of the body portion 32. Electrodes 35, 36, 37 and 38 are provided on the lower surface of the collar portion 34.

The body 32 of the core 31 includes wires 41, 42
Is wound. The wire rods 41 and 42 have one ends 41a and 42a electrically connected to the electrodes 35 and 37, and the other ends 41b and 42b to the electrode 3 respectively.
6, 38 are electrically connected.

[0004]

Conventional coil component 30
In the above, the electrodes 35 to 38 had to be installed apart from each other so that the electrodes were not electrically short-circuited. Therefore, there is a limit in reducing the size of the collar portion 4 and reducing the area occupied by the coil component 30 on the printed circuit board or the like. In particular, as shown in FIG. 5, when connecting the coil component 30 and the connector 45, the distance between the electrodes 35 and 37 or the distance between the electrodes 36 and 38 may be adjusted to the pitch of the terminals 46 of the connector 45. The smaller the distance between 35 and 36 or the distance between the electrodes 37 and 38, that is, the smaller the dimension L2 of the coil 30, the smaller the area occupied by the coil component 30 on the printed circuit board and the like, which is suitable for high density mounting. . In FIG. 5, reference numerals 48 and 49 represent circuit patterns provided on a printed circuit board or the like.

Therefore, an object of the present invention is to provide a coil component that occupies a small area on a printed circuit board or the like.

[0006]

In order to achieve the above object, a coil component according to the present invention comprises: (a) a core having a body portion and a collar portion provided at an end portion of the body portion; b) two wires wound around the body of the core, and (c) four electrodes provided substantially parallel to the bottom surface of the collar of the core, and the ends of the two wires respectively. The electrodes are electrically connected to different ones.

[0007]

In the above structure, since the four electrodes are provided substantially parallel to the bottom surface of the flange portion of the core, the insulating space is also provided substantially parallel to the electrodes. Therefore, the size of the collar,
In particular, the dimension L1 shown in FIG. 1 becomes equal to the length of only the electrode not including the insulating space, which is smaller than that of the conventional coil component. As a result, the area occupied by the coil component on the printed circuit board or the like is reduced. Moreover, since this coil component is efficiently surface-mounted on a printed circuit board or the like having a parallel circuit pattern on its surface, it is densely mounted together with a connector or the like.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the coil component according to the present invention will be described below with reference to the accompanying drawings. In this embodiment, a common mode choke coil will be described as an example, but it goes without saying that a normal mode choke coil, a transformer or the like may be used. As shown in FIG. 1, the common mode choke coil 15 includes a core 1 and two wire rods 11, 1.
And 2. The core 1 is composed of a body portion 2 and collar portions 3 and 4 provided at both ends of the body portion 2. The body 2 has a rectangular cross section. On the bottom surface of the collar portion 4, strip-shaped electrodes 5, 6, 7, 8 extending from the front edge portion to the back edge portion are arranged in parallel. The longitudinal dimension of the electrodes 5 to 8 is set to the minimum dimension required to function as an electrode. A strip-shaped insulating space is set between the electrodes 5 to 8 so that adjacent electrodes are not electrically short-circuited. As the material of the core 1, for example, a magnetic material such as ferrite or an insulating material such as resin is used.

On the body portion 2 of the core 1, the wire rods 11 and 12 are wound in a bifilar manner in an aligned state. Wire 1
Reference numerals 1 and 12 are copper wires covered with an insulating film such as polyurethane. The wire rods 11 and 12 have starting end portions 11a and 12a.
Are electrically connected and fixed to the electrodes 5 and 7, respectively, by means such as pressure bonding, welding, or soldering. Then, the wire rods 11 and 12 are simultaneously wound around the body portion 2 by the automatic winding machine. Terminal portions 11b and 12 of the wire rods 11 and 12
b is electrically connected and fixed to the electrodes 6 and 8 by means such as pressure bonding and soldering. FIG. 2 is an electrical equivalent circuit diagram of the obtained common mode choke coil 15.

In the choke coil 15, four electrodes 5 to 8 are arranged in parallel on the bottom surface of the collar portion 4, and it is not necessary to set an insulating space in the longitudinal direction of the electrodes 5 to 8. Therefore, the size of the collar portion 4, particularly the dimension L1 shown in FIG. 1, becomes equal to the length of the electrodes 5 to 8, and the area occupied by the printed circuit board or the like can be made smaller than that of the conventional choke coil.

Next, as shown in FIG. 3, a case where the choke coil 15 and the connector 25 are surface-mounted on a printed circuit board will be described. Parallel circuit patterns 28 and 29 are provided on the surface of a printed circuit board (not shown). The electrodes 5 and 7 of the choke coil 15 are electrically connected to the parallel circuit pattern 28, and the electrodes 6 and 8 are electrically connected to one end of the parallel circuit pattern 29. The terminals 26 of the connector 25 are electrically connected to the other ends of the parallel circuit patterns 29, respectively. Choke coil 1
The pitch of the electrodes 5 to 8 of No. 5 is set to 1/2 of the pitch of the terminals 26 of the connector 25, and the choke coil 15 can be mounted together with the connector 25 on the printed circuit board with high density.

The coil component according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist thereof. The shape and the like of the electrodes provided on the collar portion are arbitrary, and the positions at which the ends of the two wires are drawn out are also arbitrary. For example, the terminal portion 11b of the wire 11 is connected to the electrode 7
Alternatively, the starting end portion 12a of the wire 12 may be connected to the electrode 6.

Further, the two wire rods may be wound independently, or may be manually wound, in addition to the bifilar winding.

[0014]

As is apparent from the above description, according to the present invention, the four electrodes are arranged substantially parallel to each other on the bottom surface of the flange portion of the core, so that the size of the flange portion is reduced and the coil component is The area occupied by a printed circuit board or the like can be reduced.
Moreover, since this coil component is efficiently surface-mounted on a printed circuit board or the like having a parallel circuit pattern on its surface, it can be mounted together with a connector or the like at high density.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a coil component according to the present invention.

2 is an electrical equivalent circuit diagram of the coil component shown in FIG.

FIG. 3 is a plan view showing the connection relationship between the coil component and the connector shown in FIG.

FIG. 4 is a perspective view showing a conventional example.

5 is a plan view showing the connection relationship between the coil component and the connector shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Core 2 ... Body part 3,4 ... Collar part 5,6,7,8 ... Electrode 11,12 ... Wire rod 11a, 12a ... Starting end part 11b, 12b ... Termination part

Front page continuation (72) Inventor Masahiro Bando, 26-10 Tenjin, Tenjin, Nagaokakyo, Kyoto Inside Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. A core having a body portion and a collar portion provided at an end portion of the body portion, and two wire rods wound around the body portion of the core. A coil component, wherein four electrodes are provided substantially parallel to each other on the bottom surface, and the ends of the two wires are electrically connected to different ones of the electrodes.