JPH0226116A - Noise filter device and manufacture thereof - Google Patents

Abstract

PURPOSE:To shorten a work time and to reduce a cost by providing a sandwiching part, which sandwiches and supports a coil in the connecting edge of an external connecting terminal with the coil and supports the coil, and a locking part which can lock the coil in a release edge side rather than a sandwiching position. CONSTITUTION:Edge parts 9a, 9b, 10a and 10b of coils 9 and 10, which are coiled to a ring-shaped core 8, are respectively inserted and sandwiched to a sandwiching part 11 of a terminal 7a for external connection to be bent and formed. Thus, the core 8 is positioned through the coils 9 and 10 to the terminal 7a. Accordingly, another member is not needed in order to hold the core 8 in a constant position. From the sandwiching position of the coils 9 and 10 which are sandwiched by the respective sandwiching parts 11, the edge parts 9a, 9b, 10a and 10b are further locked to a locking part 12 respectively. Thus, the work time can be shortened and the cost can be reduced.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a noise filter device in which the ends of windings wound around an annular core are conductively connected to external connection terminals, and the manufacture thereof. Regarding the method.

(Prior Art) Fig. 11 shows a conventional noise filter device, in which Fig. 11 (a) shows a state in which a toroidal core is placed on a support plate, and Fig. 11 (b) shows a state in which a toroidal core is placed on a support plate. The configuration is shown in the same figure (
C) is an explanatory diagram showing a state in which the toroidal core and the support plate are arranged within a rectangular frame.

The noise filter device shown in FIG. 11(C) includes a support plate 1 formed by connecting a plurality of annular portions 1a or half annular portions (not shown) to each other by a plurality of connecting pieces as shown in FIG. 11(b). In each annular part 1a or semi-annular part of the same figure (a)
A toroidal core 2 is placed on each of the toroidal cores 2 as shown in FIG. As shown in Figure (a), a plurality of unit transformers 6 are formed by winding them together, and then these unit transformers 6 and support plate 1 are embedded and molded in a synthetic resin or other insulating material 4. Also, both the secondary and secondary coils 5a,
5b is connected to the open end portions of the plurality of terminals 3a formed on the rectangular frame 3 by winding each of them a plurality of times.

(Problems to be Solved by the Invention) However, the above-described conventional noise filter device had the following drawbacks.

First, each terminal 3a and each coil 5a (5b) must be connected by winding the terminal of each coil 5a (5b) around the open end of each terminal 3a multiple times. Therefore,
This winding operation makes it difficult to automate manufacturing, and furthermore, the operation takes a long time. In addition, since a predetermined square frame 3 is used to manufacture a predetermined number of unit transformers 6, when changing the number of unit transformers to be embedded in the synthetic resin or other insulating material 4 at the same time, it is possible to There was a problem in that the rectangular frame 3 itself had to be changed, making it difficult to change the design.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a noise filter device and a method for manufacturing the same that can be easily automated and changed in design while reducing costs.

[Structure of the Invention] (Means for Solving the Problems) The structure of the present invention for achieving the above-mentioned object is to reduce noise by electrically connecting the ends of the windings wound around the annular core to external connection terminals. In the filter device, a clamping part that clamps and supports the winding and a locking part that can lock the winding on the open end side from the clamping position are provided at the connection end of the external connection terminal with the winding. It is assumed that In this case, the external connection terminal may be provided with a heat conduction reducing portion that reduces heat conduction. Generally speaking, it is preferable to form such external connection terminals on the lead frame.

In addition, the method for manufacturing the above-mentioned noise filter device includes clamping the end of the winding wound around the annular core in the clamping part of the external connection terminal, and engaging the winding on the open end side from the clamping position. The method includes a step of locking the winding to the stop portion, and a step of soldering the winding and the external connection terminal.

(Function) The function of the present invention having the above configuration is to clamp the end of the winding to the clamping part of the external connection terminal, and to lock the winding on the open end side from the clamping position to the locking part. I am trying to make it so that
This makes it extremely easy to connect the winding to the external connection terminal, making it suitable for automation. Furthermore, when the external connection terminal is provided with a heat conduction reducing portion that reduces heat conduction, it is possible to prevent the solder that electrically connects the winding and the external connection terminal from flowing to other parts, and to prevent the solder from flowing to other parts. Since conduction is reduced, there is no loss of heat during soldering, and the soldering process can be completed in a shorter time. In general, when external connection terminals are formed on the lead frame, mass productivity can be improved.

Further, the end of the winding wound around the annular core is held in the holding part of the external connection terminal, the winding on the open end side from the holding position is locked in the locking part, and then the winding is Since the and external connection terminals are soldered, not only automation is possible, but also the time required for manufacturing can be shortened, contributing to cost reduction.

(Example) Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 is an enlarged perspective view showing a part of a noise filter device as an example.

In the figure, the noise filter device includes an external connection terminal 7a formed on a strip-shaped lead frame 7, and an annular core 8.
The ends 9a, 9b, 10a of the winding 9.10,
10b are conductively connected to the external connection terminals 7a.

The illustrated noise filter device is shown before being cut out from the lead frame 7 and before being molded with resin, which means it is not yet completed.

Further, at the connection end of each of the external connection terminals 7a to the winding 9 (10), end portions 9a, 9b, 1 of the winding 9 (10) are provided.
A clamping part 11 that clamps and supports 0a and 10b, respectively, and a locking part 12 that can lock the winding on the open end side from the clamping position.
A notch 13 is formed in the middle portion as a heat conduction reducing portion to reduce heat conduction.

FIG. 2 is an enlarged view of the open end of the external connection terminal 7a viewed from arrow AA' shown in FIG.

As shown in the figure, the clamping portion 11 is connected to the external connection terminal 7.
The open end 7b of the width B is composed of an inclined portion 11a formed approximately at the center of the width B, and a groove portion 11b formed at the inner part of the inclined portion 11a. Further, the width C of the groove portion 11b is formed to be approximately the same as the diameter of the end portion 9b of the winding wire 9, so that the end portion 9b of the winding wire can be held when inserted. Further, the inclined portion 11a guides the end portion 9b of the winding wire to be inserted so that it can be easily inserted into the clamping portion 11b.

The locking portion 12 is a notch cut out in a substantially semicircular shape, and is configured to lock the open end side of the winding wire held by the gripping portion 11 in the roughness of the end portion 9b. be. Note that the locking portion 12 is not limited to a semicircular cutout, but may have another shape, such as a polygon.

Generally speaking, in this example, the dimensions, shapes, etc. of each clamping part and locking part are shown to be the same, but they may have different dimensions depending on the diameter, shape, etc. of the winding to be clamped. may be formed.

Notch part 1 as a heat conduction reducing part that reduces the heat conduction
3 is the end 9a of each winding 9, 10.

When soldering the external connection terminals 9b, 10a, 10b and the external connection terminals 7a, the purpose is to reduce the transfer of heat from the solder to parts other than the soldered parts. Therefore, the solder does not flow beyond the notch 13 to the lower part of the figure.
The ends of each winding and the external connection terminal 7a can be electrically connected in a good manner. Furthermore, since heat conduction is reduced, there is no loss of heat during soldering, and the soldering process can be completed in a shorter time.

Incidentally, the external connection terminals 7a described in detail above are formed on the lead frame 7, and the lead frame 7 will be explained with reference to FIG. 3.

The lead frame 7 shown in the same figure is a part of a belt-shaped lead frame, and sprocket holes 7C are formed at regular intervals on both ends, and there are holes 7C for sprockets formed at regular intervals. A sprocket (not shown) is inserted to allow intermittent or continuous conveyance in the direction of arrow E.

The external connection terminal 7a is located at the center of such a lead frame 7, and corresponds to the number of ends (four in this embodiment) of the windings 9 and 10 wound around the annular core 8. Two pairs of external connection terminals 7a, 7a are formed facing each other with a constant spacing between them. Then, the portion indicated by 14 will be resin molded later.

In addition, the insertion terminals 7e, which are formed at the same dimensional spacing as the insertion terminal spacing protruding from a general IC, are A part inserted into a terminal insertion hole (not shown) formed on the circuit board, in this case,
When the noise filter device is separated from the lead frame 7, it is cut at a portion indicated by 15. The cut portion 17 of the insertion terminal 7e is set at a predetermined angle F so that it can be easily inserted into a terminal insertion hole (not shown) when the completed noise filter device is automatically mounted on the circuit board (not shown).
For example, it is formed at an angle of 60 degrees.

Note that the external connection terminal 7a and insertion terminal 7e described above are
A horizontal support member 7f called a tie bar, a vertical support member 7Cl (
Both members are supported by horizontal tie bars (hereinafter also referred to as lateral tie bars or V1 tie bars) until the completed noise filter device is separated from the lead frame 7.

Next, a method for manufacturing the above-mentioned noise filter device will be explained with reference to FIGS. 4 to 8(a) and (b).

Incidentally, from FIG. 4 onwards, the same components as those explained in FIGS. 1 to 3 are given the same reference numerals, and the explanation thereof will be omitted.

As shown in FIG. 4, the lead frame 7 was initially hammered into a flat plate at the portion that would become the external connection terminal 7a.

Then, the open end side is bent from the center of the portion that will become the external connection terminal 7a in a direction perpendicular to the lead frame 7. In this embodiment, the open end side is bent from the notch 13.

Then, the lead frame 7 is formed as shown in FIG. 5(a).

The result is as shown in (b). And this time, the vertical tie bar is 7g
At the same time, the external connection terminals 7a disposed on both sides of the remaining vertical tie bars 7g are also cut. Then, the lead frame 7 becomes as shown in FIG.

Ends 9a, 9b, 10a, and 10b of the windings 9 and 10 wound around the annular core 8 are inserted into the clamping portion 11 of the external connection terminal 7a bent and formed as described above, and clamped. let Thereby, the annular core 8 is positioned with respect to the external connection terminal 7a via the windings 9 and 10. Therefore, no other device or member is required to hold the annular core 8 in a fixed position. The windings 9a and 9b110a are located on the open end side of the clamping positions of the windings 9 and 10 held by the respective clamping parts 11.

The portions 10b are respectively locked in the locking portions 12.

This roughly improves the clamping force of the windings and increases the contact area between the windings 9 and 10 and the external connection terminals 78.

and the end 9a of each winding 9.10 thereof.

9b, 10a, 10b and each external connection terminal 7a are soldered. In this case, since a notch 13 that reduces heat conduction is formed in the intermediate portion of each external connection terminal 7a, it is possible to prevent solder from flowing from the notch 13 toward the base end side. Therefore, each winding 9a, 9b, 10a,
10b and each external connection terminal 7a can be connected in a good conductive state.

Through the above manufacturing process, the appearance of the lead frame 7 becomes as shown in FIGS. 1 and 3 described above.

Next, an undercoat is applied to the open end portions of the annular core 8 and the external connection terminals 7a, that is, the raised portions, followed by resin molding. In this case, in this embodiment, the vertical tie bar 71;
Part 1 partitioned by J, 7Q and horizontal tie bars 7d, 7d
The resin is poured every 8 minutes. In this way, in this embodiment, the vertical tie bars 7 (J, 7Q) and the horizontal tie bars 7d, 7d
Since the resin mold is poured into each section 18 partitioned by , no excess resin is wasted, and the horizontal tie bar 7d prevents the resin from flowing and adhering to the insertion terminal 7e. There is. Therefore, it is possible to prevent the occurrence of "burr" at the insertion terminal 7e portion.

Next, when the horizontal tie bar 7d between the vertical tie bar 7f and the external connection terminal 7a is cut and unnecessary resin parts are removed, a noise filter is formed on the lead frame 7 supported by the insertion terminal 7e as shown in FIG. The device is ready.

When this is cut at the position shown by 15 and each insertion terminal 7e is bent at a right angle to the depth side in the drawing, a noise filter device 19 as shown in FIG. 8(a) is completed.

Incidentally, when cutting at the position shown by 16 in FIG. 7, a noise filter device 20 for surface mounting as shown in FIG. 7(b) can be easily obtained without changing other components.

According to the method for manufacturing a noise filter device detailed above,
The time required for manufacturing can be shortened, contributing to cost reduction.

It should be noted that the present invention is not limited to the embodiments shown or described above, and the following embodiments are also within the scope of the invention.

Figures 9(a) and 9(b) show that every other five vertical tie bars 7q are cut, and at the same time, the external connection terminals 7a placed on both sides of the remaining vertical tie bars 7Q are cut. be.

When cut in this way, four pairs of facing external connection terminals 7a, 7a are continuously formed, and two sets of external connection terminals 7a.

An annular core 8 may be placed every 7Q in the same manner as described above, and the two annular cores 8, 8 may be resin-molded together. That is, the vertical tie bar 7q and the external connection terminal 7a
By combining the cutting positions, it is possible to construct a noise filter device in which a plurality of annular cores are resin-molded together. Of course, even when configured in this way, the same effects as described above can be obtained.

By the way, the cutout portion as a heat conduction reducing portion for reducing heat conduction formed in each of the external connection terminals 7a described above is the first one.
It may be as shown in FIGS. 0 (a) to (d).

The figure (a) shows two notches 21 and 22 formed from both sides toward the center, and the figure (b) shows an elongated notch 23,
The same figure (C) shows two circular notches 24 and 24, the same figure (d
) is a notch that is a combination of the above-mentioned figures (a) and (b). Even with such a heat conduction reducing portion, the same effect as described above can be obtained. In addition to the above-mentioned notch, for example, an uneven protrusion may be formed to increase heat radiation. That is, the heat conduction reducing part may be any part as long as it can prevent the solder from flowing to parts other than the soldered parts.

[Effects of the Invention] According to the present invention described in detail above, it is possible to reduce costs and provide a noise filter device and a manufacturing method thereof that are easy to automate and change in design.

[Brief explanation of the drawing]

FIG. 1 is an enlarged perspective view showing a half-finished noise filter device and its surroundings, which is an embodiment of the present invention;
Fig. 2 is an enlarged view of the external connection terminal viewed from AA' shown in Fig. 1, and Fig. 3 shows the partially completed noise filter device shown in Fig. 1 attached to the lead frame. The explanatory diagrams shown in FIGS. 4 to 7 are explanatory diagrams for explaining the manufacturing method up to the semi-finished noise filter device shown in FIG. 1, and FIGS. 8(a) and (b). FIG. 9(a) is an external perspective view of a noise filter device completed by the above manufacturing method. (b) is an explanatory diagram showing another embodiment of the noise filter device constituted by a combination of the external connection terminal and the cutting position of the vertical tie bar. 11(a) to (C) are explanatory diagrams showing examples of
) is an explanatory diagram of a conventional noise filter device. 7... Lead frame, 8... Annular core, 9.10
...Winding, 9a, 9b, 10a, 10b,... End, 7a... Terminal for external connection, 11... Clamping part, 12... Locking part, 13.21, 22, 23 , 24... Heat conduction reduction section.

Claims (4)

[Claims] (1) In a noise filter device in which the ends of the windings wound around the annular core are conductively connected to external connection terminals, the windings are held between the ends of the external connection terminals connected to the windings. What is claimed is: 1. A noise filter device comprising: a clamping part that supports the winding at the clamping position; and a locking part capable of locking the winding on the open end side from the clamping position. (2) The noise filter device according to claim 1, wherein the external connection terminal includes a heat conduction reducing portion that reduces heat conduction. (3) The noise filter device according to claim 1 or 2, wherein the external connection terminal is formed on a strip-shaped lead frame. (4) a step of causing the clamping part of the external connection terminal to clamp the end of the winding wound around the annular core, and locking the winding on the open end side from the clamping position to the locking part; 4. The method for manufacturing a noise filter device according to claim 1, further comprising the step of soldering the winding wire and the external connection terminal.