JPS63164495A - Electromagnetic wave shielding structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an electromagnetic wave shielding structure.

Background Art For example, in electronic devices such as facsimile machines, a large number of active elements and inactive elements are mounted on one or more substrates and interconnected to form a signal processing circuit or @rl.
In order to form 111 circuits and connect these electronic circuits to devices such as telephones and printers outside the board, a branch connection part is provided on the board for inserting a mononylon stock tank as a connection means. A mononylash tank for connecting an external device such as a telephone is inserted into the branch connection section and connected to an external Wi-Fi device using a string. A typical prior art is shown in FIG.

FIG. 5 is a perspective view showing an example of the use of the Monony 2 Jack, in which active elements such as integrated circuit elements and transistors, circuit parts 12 such as resistors and capacitors are placed on a substrate 11, and printed wiring, etc. At predetermined locations on the six substrates 11, which are connected to each other to form an electronic circuit, a plurality of (two in the illustrated example) external [iF connection monolayer tanks 13.15] are connected to each other to form an electronic circuit. External equipment such as a telephone line or a telephone (not shown) is connected via the iso string 14.16 which is inserted and connected to the mononylon stock tank 13.15.

FIG. 6 is a perspective view of the external appearance of the mononeeler tank 21 as described above, with its connecting surface facing upward.

The mononylash tank 21 includes a main body 21a and a handle portion 21b.
is integrally molded of a transparent plastic material with a height of about 15 mm and a side of about 12 m5, and connecting pins 22a and 22b (indicated by reference numeral 22 when collectively referred to as ), and support bins 23a, 23b (indicated collectively by reference numeral 23) are provided.

The connecting pin 22 is connected inside the main body 21a by inserting a monony love lug 24b, and is pulled out to the outside by the monony love lug 24b from a machine string 25 connected to the main body 21a. The support pin 23 serves to guide the mononeeler shaft stock 21 when it is inserted into the aforementioned board and to prevent it from falling off after insertion.

Problems to be Solved by the Invention Integrated circuits, especially electronic circuits formed by arranging a large number of digital circuit elements, radiate radio waves as noise, causing a signal-to-noise ratio (S/ N), causing malfunctions, and even causing problems such as destruction of circuit elements. Moreover, the electric field of the above-mentioned noise radio waves is concentrated at a branch contact point of a circuit such as a mononylon tank, and is concentrated at a part that protrudes in shape, so a particularly large amount of noise radio waves is radiated from the mononylon stock tank. be done.

On the other hand, in the conventional mononeeler tank 13.15 according to the prior art, no countermeasures have been taken, and the main body 21a is insulating and unshielded, so it is defenseless against unnecessary radiation such as noise. It was a structure. In addition, the fact that the conventional mononymous shield is vulnerable to unnecessary width and radiation means that it is also easily affected by noise that enters from the outside. This also means that circuit elements on the printed circuit board are affected by noise caused by unnecessary radiation. This has been a problem in that it reduces the stability and reliability of the circuit operation.

The present invention solves the above-mentioned technical problems and provides an electromagnetic wave shielding structure that prevents unnecessary radiation such as noise and radiation from other sources.

Means for Solving Problem α The present invention provides a printed wiring board provided with a connecting portion for realizing electrical connection with an external circuit, a shank attached to the connecting portion, and a shank attached to the connecting portion. This electromagnetic wave shielding M structure is characterized in that it includes an electromagnetic wave shielding member made of a metal material and attached to a printed wiring board so as to surround the shank.

Function According to the present invention, electrical connection with an external circuit is realized by attaching the shank to the connection portion of the printed wiring board and inserting the rock string. On the other hand, the shank attached to the connection part is surrounded by a shielding member made of a metal material. This shielding member can shield unwanted electromagnetic waves generated from a circuit connection point such as a shank. Further, it is possible to prevent the influence of undesired electromagnetic waves from the outside from affecting the electric circuit including the shank.

Embodiment FIG. 1 is a perspective view showing an example of the use of a shielding structure according to an embodiment of the present invention, and FIG. 2 is a sectional view taken from the section line ■-■ in FIG. This embodiment will be described with reference to FIGS. 1 and 2. Integrated circuit element 12
On the printed wiring board 11 on which a large number of circuit components 12b such as a, resistors, capacitors, etc. are arranged and an electronic circuit is formed, a mononylon shirt tank 13.15 shown by a broken line is inserted. External equipment such as a telephone (not shown) is connected to the board 11 via the rock straps 14 and 16 inserted into the hooks 13 and 15.

A shielding structure (hereinafter referred to as a shield case) 1, which is an electromagnetic wave shielding member, is made of, for example, a thin copper plate, and the convex portions 1a and 1b that can surround the mononylon shaft tank 13.15 are flat plates by drawing molding or the like. A shaped attachment is formed on part 1e. The mononylon shaft stock 13.15 has a shape into which a mononylon rubber plug 17.18 is inserted. The connecting wires 14 and 16 including the monony love plugs 17 and 18 are named Isohimo. ? j! String 14.16 is
It is pulled out from Monoura Lug 17.18. The shield case 1 that surrounds the Motsuyura shank 13.15 can be attached to the board 1 through one or more small holes 1f provided in the part 1e, and by screws 2.
is fixed to.

Referring to FIG. 2, at a portion 11a on the board 11 that the shield case 1 comes into contact with, a ground line (1!I not shown) made of, for example, printed wiring is exposed, and the shield case 1 is attached using screws 2. When it is fixed to the substrate 11 by
The shield case 1 is naturally connected to the ground line. Therefore, the shield case 1 shields the modular shanks 13, 15, and prevents noise from being radiated to the outside or intruding from the outside as described in the prior art section.

In the embodiment described above, the monoera shank to be shielded is
Therefore, the protrusions 1a and lb provided on the shield case 1 are also made to correspond to this.
Of course, the number of b is not limited to two.

FIG. 3 is a sectional view showing how the shield case 1 is attached to the substrate 11 according to another embodiment of the present invention.

FIG. 3 is similar to FIG. 12, and corresponding parts are given the same reference numerals. What should be noted in this embodiment is that the shield case 1 has a soldering part 1g as a mounting part.
is provided, and the above-mentioned soldering for attachment to the board 11 is realized by solder 3 between the substitute part IFi and the ground line lla on the board 11. Thereby, the shield case 1 is more reliably grounded on the base 11, and the shielding effect is improved.

FIG. 4 is a sectional view showing how the shield case 1 is attached to the substrate 11 according to still another embodiment of the present invention. Fourth
The figure is also similar to the figure on page 142, and corresponding parts are given the same reference numerals. What should be noted in this embodiment is that a plurality of spring members, such as phosphorescent body plates, are installed on the board 11 in advance and connected to the ground line 11a in accordance with the position where the shield case 1 is installed. A fitting recess 111 corresponding to the contact piece 4 is provided on the side surface of the shield case 1 to engage the shield case 1 and the substrate 11. This is to make the connection possible.

As a result, the shield case 1 does not require a protruding portion such as the substitute portion 1g for soldering, and space can be saved. In the above-described embodiment, a thin copper plate was used as an example of the material forming the shield case 1, but the material is not limited to this, and other materials such as a thin iron plate or an aluminum plate may be used. In the case of aluminum plates, methods using mounting screws or contact pieces are recommended.

Effects As described above, according to the present invention, a shank is attached to a connecting portion of a printed wiring board, and the shank attached to the connecting portion is surrounded by a shielding member made of a metal member.

This shielding member can shield undesired electromagnetic waves generated from a circuit connection such as a shank. Further, it is possible to prevent the influence of undesired electromagnetic waves from the outside from affecting the electric circuit including the shank. In other words, the reliability of electronic equipment using such a structure can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the present invention, FIG. 2 is a sectional view taken from the cutting plane line n-tt in FIG. 1, and FIG. 3 is a sectional view showing another embodiment of the present invention. FIG. 4 is a sectional view showing still another embodiment of the present invention, FIG. 5 is a perspective view showing the prior art, and FIG. 6 is a perspective view showing the external appearance of the modular Noyak 21. DESCRIPTION OF SYMBOLS 1... Shield case, 1a... Convex part, 2... Mounting screw, 11... Board, 13, 15.21...
Modular shank, 14.16...Connection wire, 1
7,1.8゜24...Modular plug, 25...
Isohimo Agent Patent Attorney Number of Strokes Keibe Part 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A printed wiring board provided with a connection part for realizing electrical connection with an external circuit, a shank attached to the connection part, and a shank that surrounds the shank attached to the connection part. 1. An electromagnetic wave shielding structure comprising: an electromagnetic wave shielding member made of a metal material and attached to a printed wiring board.