JP2814948B2 - Line filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line filter used on a power supply side of various electronic devices.

[0002]

2. Description of the Related Art A conventional line filter of this type includes a bobbin, a pair of windings wound around the outer periphery of the bobbin, an input terminal provided on each input side of the pair of windings, And an output terminal provided on each output side, and a square-shaped core having one side penetrated through a center axis portion of the bobbin.

[0003]

The problem with the above arrangement is that the opposite side opposing the one side rotates around the outer periphery of the bobbin about one side through which the core penetrates the center axis portion of the bobbin. That is, the magnetic flux is easily affected by the leakage magnetic flux to other portions, or noise is likely to enter the core. Therefore, an object of the present invention is to suppress the magnetic influence on other components due to the leakage magnetic flux from the core and to eliminate the intrusion of noise into the core.

[0004]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides a bobbin having a through hole in a central shaft portion.
And a pair of windings wound around the outer periphery of the bobbin,
The bobbin is provided on the input side of a pair of the windings.
An input terminal planted downward on the lower surface of
And the lower surface of the bobbin.
And an output terminal implanted downward, and
One side of the through hole is penetrated, and both sides and the opposite side are penetrated.
A square-shaped core exposed from the hole and a lower surface of the bobbin
And a support seat for supporting the bobbin.
The lower end of the force terminal and the lower end of the output terminal are
Projected below the lower surface, the support seat is
Abuts against the upper surface of the opposite side of the core, and attaches the core to the support seat;
A first locking piece that is supported and fixed on a support surface is provided .

[0005]

With the above construction, at least the opposing sides of the core are
Since the core is locked on the support surface of the support seat by the first locking piece , the opposite side of the core does not rotate around the bobbin, and therefore, the magnetic flux to other parts due to the magnetic flux leaking from the core. In addition, it is possible to suppress the influence of noise and to suppress the intrusion of noise into the core.

Further, since the bobbin is supported on the supporting surface of the support seat, even if the opposing side of the core is provided on the side of the bobbin as described above, the bobbin loses its balance and rolls in the direction of the opposing side. Therefore, it can be securely mounted on the upper surface of a printed circuit board of various electronic devices by itself.

[0007]

1 and 2, reference numeral 1 denotes a bobbin made of a synthetic resin. A pair of windings 2 shown in FIG. The left side of the winding 2 in FIG. 4 is the input terminal 3 and the right side is the output terminal 4
It has become. Further, a through hole 5 is provided in the center axis portion of the bobbin 1, and one side 6 a of the core 6 having a square shape as shown in FIG. 2 penetrates the through hole 5. That is, the bobbin 1 is divided into two portions at the through hole 5 portion, and the bobbin 1 is united with one side 6a of the core 6 interposed therebetween, and then the winding 2 is wound. The core 6 has an opposing side 6b opposing the side 6a.
Are arranged on the side of the bobbin 1 as shown in FIG.

The input terminal 3 and the output terminal 4 are planted downward at four corners on the lower surface of the bobbin 1 as shown in FIG.

In such a configuration, a support seat 7 shown in FIG. 3 is mounted on the lower surface of the bobbin 1. That support seat 7 has a locking piece 7a was Shin Basare at predetermined intervals in the horizontal direction below as shown in FIG. 3, the engaging piece 7b which is extended at a predetermined interval in the vertical direction. 1, the locking piece 7a is locked to the root portion of the output terminal 4 shown in FIG. 2 on the bobbin 1 side, and the locking piece 7b is provided between the bobbin 1 and the opposite side 6b of the core 6 as shown in FIG. And is locked to the upper surface of the opposite side 6b. In this state, both sides 6c and the opposite side 6b of the core 6 are supported on the support surface 7c of the support seat 7, and the upper surface of the opposite side 6b is engaged.
Since the claw b of the stopper 7b is in contact, the core 6
Is in a state of being supported and fixed on the support surface 7c of the support seat 7. In this state, the bobbin 1 is supported by the support seat 7. For example, when the bobbin 1 is mounted on a printed circuit board or the like, a U-shaped flat surface abuts on the upper surface of the printed circuit board. , Stable bobbin 1
Is held and mounted. Even in this state, the lower ends of the input / output terminals 3 and 4 protrude below the lower surface of the support seat 7, and the protruding ends penetrate through the through holes of the printed circuit board. In the above embodiment, the locking piece 7a of the support seat 7 is locked to the output terminal 4, but it may be locked directly to the input terminal 3 or the bobbin 1.

[0010]

As described above, according to the present invention, the center shaft portion is penetrated.
A bobbin having a through hole, and a bobbin wound around the bobbin.
And a pair of windings provided on the input side of the pair of windings.
In both cases, the lower part of the bobbin is
And a force terminal, provided on the output side of the pair of windings,
An output terminal planted downward on the lower surface of the bobbin
And one side thereof is passed through the through hole of the bobbin.
And a square-shaped core having opposing sides exposed from the through-hole,
A support mounted on the lower surface of the bobbin to support the bobbin
And a lower end of the input terminal and the output terminal.
The lower end is projected below the lower surface of the support seat,
The support seat is in contact with an upper surface of an opposite side of the core, and
First locking for supporting and fixing the core on the support surface of the support seat
A piece is provided.

With the above configuration, at least the number of cores
Also, the opposing side is locked on the support surface of the support seat by the first locking piece, so that the opposing side of the core does not rotate around the bobbin outer periphery, and therefore, the other side due to the leakage magnetic flux from the core. The magnetic influence on the portion can be suppressed, and the intrusion of noise into the core can be suppressed.

Further, since the bobbin is supported by the support seat, even if the opposing side of the core is provided on the side of the bobbin as described above, the bobbin does not lose its balance and does not roll in the direction of the opposing side. It can be securely mounted on the upper surface of a printed circuit board of various electronic devices by itself.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is a perspective view of FIG. 1 before completion.

FIG. 3 is a perspective view of the support seat of FIG. 1;

FIG. 4 is an electric circuit diagram of FIG.

[Explanation of symbols]

Reference Signs List 1 bobbin 2 winding 3 input terminal 4 output terminal 5 through hole 6 core 6a one side 6b opposite side 7 support seat 7a locking piece 7b locking piece

Continuation of the front page (72) Inventor Shunpachi Inoue 1006 Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-6-215973 (JP, A) (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) H01F 27/28-27/30

Claims (2)

(57) [Claims] 1. A bobbin having a through hole in a central shaft portion,
A pair of windings wound around the outer periphery of the bobbin,
On the input side of the winding of
An input terminal implanted downward on the surface, and a pair of windings
In addition to being provided on the output side of the wire,
To the output terminal planted toward
One side is penetrated, and both sides and the opposite side are
Exposed square core and attached to the lower surface of the bobbin
And a support seat for supporting the bobbin.
The lower end of the child and the lower end of the output terminal are on the lower surface of the support seat.
And the support seat is provided with the core
Abuts on the upper surface of the opposite side of
A line filter provided with a first locking piece supported and fixed on a surface . 2. The bobbin or the bobbin is provided on the support seat.
Second locking member that is locked to an input terminal or an output terminal
2. The line filter according to claim 1, further comprising a stopper .