JPH0418252Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a noise filter with an inlet socket, and more particularly to a noise filter with an inlet socket for removing high frequency noise from, for example, a switching power supply.

(Prior art) Conventionally, a noise filter with an inlet socket has a structure in which specified filter components are wired and soldered on a board, the board is placed in a case, and the ground pattern of the board is soldered to the case. It was hot.

(Problems to be Solved by the Invention) Conventional noise filters with inlet sockets require at least two soldering operations and are therefore complicated to assemble.

Therefore, the main objective of this invention is to provide a noise filter with an inlet socket that is easy to assemble.

(Means for Solving the Problems) Simply put, this invention includes a substrate and a metal member placed on the board, and the metal member has an inlet socket having a ground terminal and another terminal. a first part for arranging a filter component having a ground lead and another lead; the second part has a bottom plate that contacts the top surface of the substrate; An insertion hole for inserting and connecting the ground lead and a through hole for passing other leads of the filter component through without contact are formed, and the board corresponds to the first part and the second part of the metal member, respectively. The first part of the board is formed with a first insertion hole for inserting and connecting the ground terminal and other terminals of the inlet socket, and the second part of the board is formed with a first insertion hole for inserting and connecting the ground terminal and other terminals of the inlet socket. has a second lead for inserting and connecting another lead of the filter component that has passed through the through hole of the metal member.
This is a noise filter with an inlet socket, in which an insertion hole is formed, and the substrate further includes a non-contact portion where the ground lead of a filter component inserted into the insertion hole of the metal member does not come into contact with the substrate.

(Function) A filter component is placed on the second portion of the metal member,
The ground lead of the filter component is inserted into the insertion hole of the metal member. The other leads of the filter component pass through the through holes formed in the bottom plate of the second portion of the metal member and are inserted into the second insertion holes formed in the second portion of the substrate without contacting the metal member. The ground terminal of the inlet socket and the other terminal are connected to the first part of the board corresponding to the first part of the metal member.
It is inserted into a first insertion hole formed in the part. By soldering in this state, it is possible to mechanically fix the inlet socket and filter component on the board, and to electrically connect each terminal of the inlet socket and other leads of the filter component. . At this time, the ground lead of the filter component is directly electrically connected to the metal member through the insertion hole of the metal member. Then, if necessary,
The board and the metal member are placed inside the resin case and the board and the resin case are fixed.

(Effects of the invention) According to this invention, the leads and terminals of filter parts and inlet sockets can be connected to the board and metal components in a single soldering operation, so the soldering process is much simpler than in the past. becomes less,
Therefore, a noise filter with an inlet socket that is easy to assemble can be obtained. Furthermore, since the ground lead of the filter component is directly connected to the metal member, good filter characteristics can be obtained.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(Embodiment) FIG. 1 is an exploded perspective view showing an embodiment of this invention. Noise filter 1 with inlet socket
0 includes a metal case 12 made by pressing a metal plate such as aluminum. This metal case 12 includes an opening 16 for fitting an inlet socket 14 and a case portion 20 for accommodating three-terminal capacitors 18a and 18b as filter components. The three-terminal capacitors 18a and 18b each have electrodes formed opposite to each other on both main surfaces thereof, and ground leads 30a and 30b are connected to the ground electrodes.
Leads 32a and 32b on the input side and output side are connected to the opposing electrodes, and bead cores may be used as necessary.

Inlet sockets 14 are located on both sides of the opening 16.
Through-holes 24a and 24 formed in the brim portion 22 of
Through holes 26a and 26b are formed so as to correspond to b, respectively.

The case portion 20 has an open upper end and a bottom plate 2.
The bottom plate 2 is formed in the shape of a case with a bottom.
8, a ground lead insertion hole 34a and two through holes arranged to sandwich the ground lead insertion hole 34a, respectively corresponding to the ground lead 30a of one three-terminal capacitor 18a and the remaining two leads 32a. A hole 36a is formed. Similarly, a ground lead insertion hole 34b and a through hole 36b are formed corresponding to the ground lead 30b and other leads 32b of the other three-terminal capacitor 18b, respectively. The ground leads 30a and 30b are inserted into and connected to the ground lead insertion holes 34a and 34b, but the through holes 36a and 36b are connected to the other leads 3, respectively.
2a and 32b are sized and shaped so that they penetrate through the bottom plate 28 without contacting it.

The bottom plate 28 of the case portion 20 of the metal case 12 has a Faston tab terminal 3 projecting downward.
8 is fixed, for example by spot welding.

The metal case 1 is located near the upper end of the case portion 20.
A tongue piece 12a is formed integrally with the tongue piece 12.
A through hole 26c is formed in a.

The inlet socket 14 is made of an insulating material such as synthetic resin and has a rectangular cylindrical shape with a bottom.
One ground terminal 40 and input and output terminals 42a and 42b are fixed to the bottom so as to protrude downward.

A printed circuit board 44 is provided, and conductive patterns 45a, 47 and 45b are printed on the back side of the printed circuit board 44, as can be seen especially in FIG. 4C. The printed circuit board 44 has insertion holes 46, 48a and 48b corresponding to the ground terminal 40 and input/output terminals 42a and 42b of the inlet socket 14, respectively.
is formed. The printed circuit board 44 further includes:
A film capacitor 5 is placed approximately in the center of the lengthwise direction.
An insertion hole 54 for a pair of leads 52 is formed. The printed circuit board 44 has step portions 56a and 56b formed at both ends in the width direction, and the step portions 56a and 56b serve as "escape" or non-contact portions for the ground leads 30a and 30b of the three-terminal capacitor, respectively. Printed circuit board 4
4 has an insertion hole 60 for two tab terminals 58.
is formed, and the tab terminal 58 is press-fitted into this insertion hole 60. Note that the tip of the tab terminal 58 is
As shown by diagonal lines in FIG. 1, a rubber cap, for example, is placed over the cap to prevent solder from adhering to this portion during the subsequent soldering process.

Notches 62 are formed at both ends of the printed circuit board 44 in the width direction at approximately the center in the length direction. The printed circuit board 44 is further formed with a through hole 64 for the Faston tab terminal 38 attached to the metal case 12.

Here, to supplementally explain the board 44 with reference to FIG. 4C, the board 44 has two insertion holes 57 for the other leads 32a and 32b of the three-terminal capacitors 18a and 18b, respectively.
a and 57b are formed. Previous pattern 45
Pattern a connects the insertion holes 48a and 57a, that is, the terminal 42a of the inlet socket, and one of the other leads 32a of the three-terminal capacitor 18a, and pattern 45b connects the insertion holes 48b and 57b, that is, the terminal of the inlet socket. 4
2b and one of the other leads 32b of the three-terminal capacitor 18b. Other leads 32 of the three-terminal capacitors 18a and 18b are located near the two mounting holes 60 of the board 44, respectively.
Insertion holes 57a and 57b are formed for inserting and connecting the other of a and 32b. Mounting hole 6
A pattern 59a connecting the mounting hole 60 and the insertion hole 57a and a pattern 59b connecting the mounting hole 60 and the insertion hole 57b are formed on the substrate 44, respectively.

A resin cover 61 is provided to cover the upper opening of the case portion 20 of the metal case 12, and two legs 63a and 6 are provided on the lower surface of the resin cover 61.
3b are provided and these legs 63a and 63b
The tip thereof is welded to the printed circuit board 44 through a through hole or notch (not shown) provided in the bottom plate 28 of the metal case 12 .

A bottomed resin case 66 having an elongated plane and a rectangular shape is provided. The resin case 66 is made of an insulating material such as synthetic resin, and the bottom plate 68 of the resin case 66 is formed with a terminal guide 70 for the tab terminal 58, which is inserted through the printed circuit board 44. A through hole 72 for the first tab terminal 38 is formed. Fixing claws 74 are further formed on the bottom plate 68 of the resin case 66 at positions corresponding to the notches 62 at both ends of the printed circuit board 44 in the width direction.

When assembling, first, the inlet socket 14 and the film capacitor 50 are attached to the printed circuit board 44. That is, the printed circuit board 44
The ground terminal 4 of the inlet socket 14 is inserted into the insertion holes 46, 48a and 48b, respectively.
0 and input/output terminals 42a and 42b, respectively. At the same time, the leads 52 of the film capacitor 50 are inserted into the mounting holes 54.

After that, the Faston tab terminal 38 is inserted into the through hole 64.
The metal case 12 is placed on the upper surface of the printed circuit board 44 so that the metal case 12 is inserted therethrough. A three-terminal capacitor 18 is attached to the case portion 20 of the metal case 12.
Attach a and 18b. That is, the ground lead 30a of the three-terminal capacitor 18a is inserted into the ground lead hole insertion hole 34a of the metal case 12, the other lead 32a is passed through the through hole 36a of the case portion 20, and the other lead 32a is inserted into the insertion hole 57a (fourth C) of the printed circuit board 44. (Fig.). In the same way,
Insert the ground lead 30b of the three-terminal capacitor 18b into the ground lead insertion hole 34b, pass the other lead 32b through the through hole 36b, and connect the printed circuit board 4.
4 into the insertion hole 57b (FIG. 4C).

Thereafter, the tab terminal 58 is press-fitted into the insertion hole 60 of the printed circuit board 44. The situation is shown in FIG. However, in this Figure 2 and later Figure 3,
The faston tab terminal 38, tab terminal 58, etc. are omitted.

In the state shown in FIG. 2, the printed circuit board 44 is soldered, for example, by flow soldering. Then, the terminals 40, 42a and 42b of the inlet socket 14 are electrically connected and mechanically fixed to the printed circuit board 44, and the leads 52 of the film capacitor 50 are also connected in the same way. 3 terminal capacitor 18a
and 18b ground leads 30a and 30b
is the bottom plate 28 of the case portion 20 of the metal case 12.
earth lead insertion holes 34a and 34b (first
56a of the printed circuit board 44.
and 56b (FIG. 1). That is, in this state, the ground leads 30a and 3
0b does not touch the substrate 44, and the metal case 1
It is soldered to 2. The other leads 32a and 32b pass through through holes 36a and 36b in the case portion 20 of the metal case 12, respectively.
Corresponding insertion holes 57a and 5 of printed circuit board 44
7b and connected.

Thereafter, as shown in FIG. 3, unnecessary leads are cut off. Although not shown, the rubber cap of the tab terminal 58 described above may be removed at this stage.

In addition, at this time, if necessary, the resin cover 6
Install 1.

As shown in FIG. 3, with each necessary component attached to the printed circuit board 44, the printed circuit board 44 is placed in a resin case 66.
Store inside. At this time, the tab terminal 58 passes through the terminal guide 70 of the resin case 66 and
6 , and the Faston tab terminal 38 projects through the through hole 72 . In this state, the fixing claws 74 are hooked onto the left and right notches 62 of the printed circuit board 44, and the printed circuit board 44 is attached to the resin case 66.
be fixed inside.

In this way, a noise filter 10 with an inlet socket as shown in FIGS. 4A to 4C is constructed.
is completed. This noise filter 10 with an inlet socket has an equivalent circuit as shown in FIG.

Such a noise filter 10 with an inlet socket is attached to the chassis 78 of the set as shown in FIGS. 5A and 5B.
To be more specific, the chassis 78 has a metal case 1.
A through hole 80 is formed corresponding to the through hole 26a, 26b of 2, that is, the through hole 24a, 24b of the inlet socket 14, respectively, and a through hole 82 is formed corresponding to the through hole 26c of the tongue piece 12a of the metal case 12. It is formed. Through holes 80, 26a, 26b and 24
Insert a screw 84 through a and 24b and fix it with a nut 85. At the same time, the screw hole 82 of the chassis 78 and the tongue piece 1 of the metal case 12
A screw 86 is inserted into the through hole 26c of the metal case 2a, and then tightened with a nut 88 from the back side of the metal case 12.

In the above description, the noise filter 10 with an inlet socket was fixed to the chassis 78 using screws and nuts. However, it may also be attached by means of tapping screws. That is, a tapping screw may be screwed into the thick resin case of the inlet socket 14 in the portions of the through holes 26a and 26b. At this time, the tongue piece 12
As for the through hole 26c in a, there is no resin case in the illustrated embodiment, so if tapping screws are used, it will be necessary to form part of a thick resin case in that area as well.

As can be clearly seen from FIG. 5A, when the noise filter 10 with inlet socket is attached to the chassis 78 as described above, the metal case 12 comes into direct surface contact with the back surface of the chassis 78. Therefore, the grounding of the noise filter 10 is good.

Note that the side wall of the case portion 20 of the case 12 may be removed.

Furthermore, the resin cover 61 shown in the embodiment in FIG. 1 may be omitted.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of this invention. Fig. 2 is a cross-sectional diagram showing the state in which necessary components are assembled on the printed circuit board in the embodiment shown in Fig. 1, and Fig. 3 is a cross-sectional diagram showing the state after unnecessary leads are cut after soldering. It is a diagram. 4A to 4C are illustrative views showing the completed noise filter with inlet socket, FIG. 4A is a front view with the resin cover removed, and FIG. 4B is a partially cutaway side view. Fourth
Figure C is a rear view with the resin case removed. 5th A
5A and 5B are illustrative views showing how the noise filter with inlet socket is attached to the chassis of the set, FIG. 5A is a side view thereof, and FIG. 5B is a top view thereof. FIG. 6 is an equivalent circuit diagram of the noise filter with inlet socket of this embodiment. In the figure, 10 is a noise filter with an inlet socket, 12 is a metal case, 14 is an inlet socket, 16 is an opening, 18a, 18b are three-terminal capacitors, 20 is a case part, 24a, 24
b is a screw hole, 26a, 26b, 26c are through holes, 3
0a, 30b are ground leads, 34a and 34
b is a ground lead hole, 36a, 36b are through holes,
44 is a printed circuit board, 66 is a resin case, and 74 is a fixing claw.

Claims (1)

[Claims for Utility Model Registration] A substrate and a metal member disposed thereon, the metal member including a first part for arranging an inlet socket having a ground terminal and another terminal, a ground lead, and the like. a second part for arranging a filter component having leads, the second part having a bottom plate in contact with the top surface of the substrate;
The bottom plate is formed with an insertion hole for inserting and connecting the ground lead of the filter component, and a through hole for passing the other lead of the filter component through without contacting it, and the substrate is formed of the metal. a first portion and a second portion corresponding to the first portion and the second portion of the member, respectively; the first portion of the substrate includes the ground terminal and the other terminal of the inlet socket; A first insertion hole for insertion and connection is formed in the second portion of the substrate, and a first insertion hole for insertion and connection of the other lead of the filter component that has passed through the through hole of the metal member. A noise filter with an inlet socket, wherein a second insertion hole is formed, and the substrate further includes a non-contact portion where the ground lead of the filter component inserted into the insertion hole of the metal member does not come into contact with the substrate.