JPH0310656Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement in the mounting structure of a feedthrough capacitor that is attached to a high frequency shield case used in electronic equipment such as radio equipment that uses high frequencies.

[Technical background of the invention]

A feed-through type capacitor has a capacitor formed inside with electrodes provided on both sides of a dielectric, and a main body connected to one of the electrodes, and a capacitor that penetrates the main body while being insulated from the main body. , and a lead portion connected to the other electrode. The main body section is attached to the shield case, one end of the lead section is connected to a circuit section inside the shield case, and the other end of the lead section is connected to a device etc. outside the shield case. The configuration is such that high-frequency noise signals flowing in and out through a line connecting external devices and the circuit inside the shield case are removed.

4 and 5 show a conventional mounting structure for mounting this type of feedthrough capacitor to a shield case.

In these figures, 1 is the shield case, 2
3 is a printed wiring board attached to a predetermined position inside the shield case 1, and 3 is a feedthrough capacitor.
The feedthrough capacitor 3 includes a main body 4 and a lead 5 that penetrates the main body 4 while being insulated from the main body 4. A male thread 6 is formed in the main body portion 4 . And this male screw 6,
The feedthrough capacitor 3 is attached to the shield case 1 by screwing into the screw hole formed on the side surface 7 of the shield case 1.
and the main body portion 4 are also electrically connected. In addition, a lead portion 5 located inside the shield case 1
A is bent 90 degrees downward. The lead portions 5a are then inserted into the lead insertion holes of the printed wiring board 2 and connected to the printed wiring board 2 with solder 8. Further, a cable 9 is connected to a lead portion 5b located outside the shield case 1, and electrical connection between an external device of the shield case 1 and the printed wiring board 2 is performed.

However, in the case of the above-mentioned mounting structure,
When it is necessary to remove the printed wiring board 2 from the shield case 1 for maintenance or inspection of the printed wiring board 2, the lead portion 5a of the feedthrough capacitor 3 must be removed from the printed wiring board 2. Moreover, solder remains in the lead insertion holes of the lead part 5a and the printed wiring board 2 that have been removed, and other problems occur. 5
The work of attaching a to the printed wiring board 2 has become extremely difficult. Furthermore, since the printed wiring board 2 and the lead portion 5a deteriorate due to heating, there is a problem in that the reliability of the device decreases.

Therefore, in order to solve the above problem, conventionally, a mounting structure has been used in which the feedthrough capacitor 3 is attached to the shield case 1A using a mounting bracket 10, as shown in FIGS. 6 and 7. In this mounting structure, the feedthrough capacitor 3 is attached to the mounting bracket 1.
0, and the lead portion 5a is bent at 90 degrees. Then, the mounting bracket 10 is screwed into the side plate 7A of the shield case 1A.
2, the feedthrough capacitor 3 is attached to the shield case 1A, and the lead portion 5a
is connected to the printed wiring board 2. In this case, the side plate 7A has a hole 14 opened downward. Therefore, the printed wiring board 2 is placed in the shield case 1.
When removing from A, the feedthrough capacitor 3 can also be removed at the same time by removing the screws 12, so the problems with the mounting structure shown in FIGS. 4 and 5 are solved.

[Problems with background technology]

However, the conventional mounting structure described above has the following problems.

When attaching the printed wiring board 2 to the shield case 1 or 1A, it is necessary to bend the lead portions 5a downward so that the lead portions 5a can be inserted into the lead insertion holes. In this case, the lead portion 5a
Because of its rigidity, it is difficult to reliably bend it to a predetermined angle that allows it to be inserted into the lead insertion hole, and this bending operation requires a large number of man-hours.

Further, since the lead portion 5a is parallel to the printed wiring board 2, and the lead portion 5b and the cable 9 connected thereto are located outside the side plate 7 (or 7A), the feedthrough capacitor 3 It was not possible to attach electronic components or other devices on the printed wiring board 2 and around the shield case 1 near where the shield case 1 was attached.

[Purpose of invention]

The present invention has been developed in view of the above-mentioned drawbacks of the conventional method, and it does not require bending the lead portion connected to the printed wiring board, and it is possible to effectively utilize the space inside and outside the shield case. It is an object of the present invention to provide a mounting structure for a feedthrough capacitor that allows a printed wiring board to be easily removed from a shield case while the board and lead portion are connected.

[Summary of the idea]

Therefore, in the mounting structure of the feedthrough capacitor of the present invention, the main body of the feedthrough capacitor is attached to the mounting bracket, and the lead portion of the feedthrough capacitor connected to the printed wiring board is perpendicular to the printed wiring board. The above object is achieved by attaching the mounting bracket to the inner surface of the shield case, which is horizontal to the printed wiring board.

[Example of idea]

Embodiments of the present invention will be described below with reference to Figures 1 to 3.
This will be explained in detail with reference to the drawings.

In these figures, 20 is a shield case,
21 is a printed wiring board that is attached to a predetermined position inside the shield case 20, 22 is a feedthrough capacitor, and 23 is a mounting bracket. Feedthrough capacitor 2
2 is composed of a main body part 25 and a lead part 26 that penetrates the main body part 25 while being insulated from the main body part 25, as in the conventional example, and a male screw 27 is formed in the main body part 25. ing. Further, the mounting bracket 23 is provided with a screw hole (not shown) into which the male screw 27 is screwed, and a screw hole 29 for fixing the mounting bracket 23 to the shield case 20. On the other hand, a recess 31 is formed in the upper part 30 of the shield case 20, and a bottom 3 of the recess 31 is formed in the upper part 30 of the shield case 20.
2 includes a hole 33 for causing one of the leads 26 of the feedthrough capacitor 22 to protrude outside the shield case 20, and a screw 3 screwed into the screw hole 23.
Four insertion holes 35 are formed.

The feedthrough capacitor 22 is attached to the mounting bracket 23 by screwing the male screws 27 of the main body 22 into the screw holes of the mounting bracket 23. The mounting bracket 23 is brought into contact with the inner surface 36 of the bottom portion 32 from inside the shield case 20, and is fixed inside the shield case 20 by screwing the screw 34 into the screw hole 29. As a result, the feedthrough capacitor 22 is connected to the shield case 20.
can be attached to. At this time, the lead portion 26 is
As shown in FIG. 3, one end side 26a is positioned inside the shield case 20 facing downward, and the other end side 26b is located in the hole 33.
It protrudes outward from the wall and is positioned facing upward. After the feedthrough capacitor 22 is attached, the printed wiring board 21 is attached to the shield case 20. This printed wiring board 21
is configured to be attached to the shield case 20 in a state perpendicular to the leads 26. Therefore, when the printed wiring board 21 is attached to the shield case 20, the lead portions 26a are inevitably inserted into the lead insertion holes 39. Then, as in the conventional example, the leads 26a and the printed wiring board 21 are connected by solder 40. In addition, a cable 41 is connected to the lead 26b, and connects external devices of the shield case 20 and the printed wiring board 21.
A connection is made.

Further, when removing the printed wiring board 21 from the shield case 20, the screws 34 may be removed. As a result, the printed wiring board 21 can be removed from the shield case 20 without disconnecting the printed wiring board 21 and the lead part 26a, and even when reattaching the printed wiring board 21, the mounting bracket 23 can be fixed with the screws 3.
4, the feedthrough capacitor 22 is fixed to the shield case 20.
Because it can be attached to the printed wiring board 21
can be easily installed.

[Effects of the invention] As mentioned above, the mounting structure of the invention has the following effects:
Since there is no need to bend the lead portion when connecting the lead portion of the feedthrough capacitor to the printed wiring board, the number of man-hours required for attaching the feedthrough capacitor can be greatly reduced. In addition, since feed-through capacitors are installed with their leads perpendicular to the printed wiring board, electronic components or Other equipment can be attached. Therefore, the space inside and outside the shield case can be used effectively. In this case, as shown in the embodiment, by forming a recess in the shield case, the space required for mounting the feedthrough capacitor can be further reduced. Furthermore,
When manufacturing a shield case using die casting, unlike conventional shield cases, holes are formed in the top and bottom of the shield case, so the shield case can be manufactured with a simple mold, reducing mold costs. can be made inexpensive. Moreover, the printed wiring board can be easily removed from the shield case with the printed wiring board and the leads of the feedthrough capacitor connected, and can be easily reattached. It is a big thing.

[Brief explanation of the drawing]

1 to 3 are diagrams illustrating an embodiment of the present invention, and FIG. 1 is an exploded perspective view illustrating the assembly procedure of a feedthrough capacitor to a shield case;
FIG. 2 is a perspective view illustrating a state in which the feedthrough capacitor is attached to a shield case, and FIG. 3 is a sectional view of a main part of the same. Furthermore, FIGS. 4 and 5 are a perspective view and a sectional view of a main part of a conventional mounting structure for a feedthrough capacitor, and FIGS.
The figures are a perspective view and a sectional view of essential parts for explaining another conventional example same as the above. 20... Shield case, 21... Printed wiring board, 22... Feedthrough capacitor, 23... Mounting bracket, 25... Main body, 26, 26a, 26b...
Lead part, 36...Inner surface of shield case.

Claims (1)

[Scope of utility model registration request] The main body is attached to the shield case with one of the lead parts being positioned outside the shield case and the other lead part being positioned inside the shield case, and the other lead part is attached to the inside of the shield case. In the mounting structure of a feedthrough capacitor connected to a board, the main body portion is attached to a mounting bracket, and the mounting bracket is in a state in which the other lead portion is orthogonal to a printed wiring board mounted inside the shield case. A mounting structure for a feedthrough capacitor, characterized in that the capacitor is mounted on an inner surface of the shield case that is horizontal to the printed wiring board.