JPS584329Y2 - noise filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a noise filter for removing noise generated from or flowing into electronic equipment.

BACKGROUND OF THE INVENTION With the development and popularization of electronic devices, noise filters have come to be widely used to regulate radio wave interference generated by electronic devices and to remove external noise flowing into the devices.

Since a noise filter is usually inserted on the primary side of a power supply line, there are strict requirements for safety and reliability, and on the other hand, it is desirable that the cost be low so that it can be widely used.

FIG. 1 shows a conventional box-shaped noise filter.

This noise filter houses a capacitor 2, a coil 3, etc. in an insulating box-shaped case 1, and connects them to each other and a lead wire 4 by soldering with a soldering iron. It has a structure in which resin 5 is cast for fixation.

FIG. 2 shows a conventional round noise filter.

In this case as well, the container 2A, coil 3A, etc. are housed in an insulating round case 1A that is attached with a nut 6, and the connections between them and the lead wire 4a are made by soldering. After that, the resin 5A is cast to form the structure.

However, in the conventional structures shown in FIGS. 1 and 2, it was necessary to connect capacitors, coils, etc. at each location manually using a soldering iron, resulting in poor work efficiency.

In addition, the positions of the soldered connections within the case are different, and in order to fix and insulate each connection part, it is necessary to cast resin almost entirely, and the amount of resin required for casting is large. The cost was high.

Furthermore, as a result of casting the entire body with resin, the coil portion is also covered with resin, causing the inconvenience that the inductance of the coil portion changes due to shrinkage during thermosetting during casting.

The present invention eliminates the above-mentioned disadvantages, unifies the positions of the connecting parts of each element and leader wire, and also makes it possible to reduce the amount of resin required for casting by making the connecting parts close to the bottom of the case. Furthermore, the present invention aims to provide a noise filter that reduces costs and improves work efficiency.

Embodiments of the noise filter according to the present invention will be described below with reference to the drawings.

3 and 4 show the structure of the embodiment, and FIG. 5 shows its equivalent circuit.

In these figures, inside the insulating square case 1B,
The capacitors 2B, 2C, 2D and the coil 3B are housed in the case 1B, and the capacitors 2B, 2C, 2D are arranged at the lower part of the case 1B.

The connections between those elements and the lead wire 4B are as follows:
This is done near the bottom of the case 1B via the cylindrical connection terminal 7.

That is, the connection terminal 7 is fitted into the connection part 8 of the capacitors 2B, 2C, 2D, the coil 3B, and the lead wire 4B, and the connection terminal is inserted into the solder bath while mechanically holding the lead wires of these elements. Soldering is carried out by dipping the 7 parts.

Capacitors 2B, 2C, 2D connected in this way
The coil 3B is housed in the case 1B so that the connection terminal 7 is on the bottom side of the case 1B, and is insulated and fixed by the resin 5B.

In this case, resin casting is performed as shown in FIGS. 3 and 4.
It is sufficient to cover the connection terminal 7 and the lead wires of the capacitors 2B, 2C, and 2D sufficiently.

As explained above, according to this embodiment, the connecting portions 8 of the capacitors 2B, 2C, 2D, the coil 3B, and the lead wire 4B are made to be approximately at the same height, and the case 1B
When the case 1B is stored in the case 1B, the connecting portions 8 are close to the bottom surface of the case 1B, so that the following effects can be obtained.

(1) Soldering work can be performed in one operation by immersing the connecting part in a solder bath.

Therefore, work efficiency can be greatly improved.

(2) Soldering requires a minimum amount of resin for fixing parts and reinforcing lead wires.

Therefore, cost reduction is possible.

(3) Since resin does not enter the coil portion, there is no adverse effect on the coil, and the inductance of the coil is stabilized.

FIG. 6 shows another embodiment of the present invention, in which capacitors 2B, 2C, 2D and a coil 3B are arranged flat in a case 1C.

The rest of the structure is the same as the embodiment described above, and the embodiment shown in FIG. 6 can also achieve the same effects as the embodiment described above.

In the above embodiment, the cylindrical connection terminal 7 is used to mechanically hold the connection part 8 in order to facilitate the soldering work, but other shapes may also be used.
You can omit it if necessary.

Further, although an insulating case was used in the above embodiment, a similar effect can be obtained by using a metal case made of aluminum or the like provided with insulating paper or the like.

As described above, the present invention provides a noise filter that can reduce costs and improve work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing the configuration of a conventional box-shaped noise filter, Fig. 2 is a front sectional view of a conventional round noise filter, and Fig. 3 is a front sectional view showing an embodiment of the noise filter according to the present invention. 4 is a side sectional view, FIG. 5 is an equivalent circuit diagram of the embodiment, and FIG. 6 is a front sectional view showing another embodiment. 1B... Square case, 2B, 2C, 2D...
...Capacitor, 3B...Coil, 4B...
...Leader line, 5B...Resin, 7...
・Connection terminal, 8...Connection part.

Claims (1)

[Scope of utility model registration request] In a noise filter consisting of elements such as capacitors and coils housed in a case, the connecting parts of the elements and the lead wires are located on almost the same plane inside the case, and the connecting parts are arranged close to the bottom of the case. is,
A noise filter characterized by being insulated and fixed with resin.