JPH09186481A - Shield structure of printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shield a plurality of printed boards securely by a single shield board as a unitary body and to facilitate connecting and disconnecting works by providing a plurality of board fixing means in a protruding pattern at the respective peripheries of the upper surface and the lower surface of the shield board provided between a plurality of the printed boards, and fixing each printed board. SOLUTION: A shield board 10 is arranged between two printed boards 1 and 2. The shield board 10 comprises a shield-board main body 11 and a plurality of board fixing means 12a and 12b. A plurality of the board fixing means 12a and 12b are provided in a protruding pattern at the respective peripheries of the upper surface and the lower surface of the shield main body 11 and fixed to the respective surface edges of a plurality of the printed boards 1 and 2 arranged at the upper and lower surfaces of the shield board main body 11. That is to say, a plurality of the printed boards 1 and 2 can be shielded as a unitary body by fixing the board fixing means 12a and 12b of the single shield board main body 11 arranged between two printed boards 1 and 2 to a plurality of the printed boards 1 and 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure of a printed circuit board for electrically shielding each printed circuit board from each other in a TV game machine or the like having a plurality of printed circuit boards in one set. The present invention relates to a printed circuit board shield structure for integrally and reliably shielding a printed circuit board with only a simple structure.

[0002]

2. Description of the Related Art Generally, the most ideal shield structure of an electronic device is to cover the entire device with a shield case. However, depending on the device, it is necessary to provide an opening in a shield portion to accommodate an extension unit. In some cases, it is not always appropriate to cover the whole with a shield case.

Therefore, conventionally, in an electronic device (for example, a TV game machine) having a plurality of printed boards in one set, a shield plate is individually attached to each printed board in the set, and each printed board is attached. The shield structure of the printed circuit board which shields independently is adopted.

FIG. 4 is an overall perspective view showing a shield structure of a conventional printed circuit board when such a printed circuit board is individually shielded. As shown in this figure, a conventional shield structure of a printed circuit board of this type includes box-shaped shield plates (shield cases) 100, 200 opened on one side on the surfaces of the printed circuit boards 1, 2 to be shielded.
The plurality of printed circuit boards 1 and 2 are electrically shielded from each other by fixing the printed circuit boards.

[0005] Printed circuit boards 1 and 2 and shield plates 100 and
As shown in FIG. 5, as a method for fixing 200, a projection 101 (201) is formed on the periphery of the shield plate 100 (200) on the printed circuit board side, and the projection 101 (201) is formed.
Through a through hole formed in the printed circuit board 1 (2),
This is performed by fixing the same by soldering.

[0006] Each printed circuit board to which the shield plate is fixed as described above is incorporated in the same set, and constitutes an electronic device such as a TV game machine.
As a shield structure of this type of printed circuit board, for example, a circuit unit of an electromagnetic wave shield type described in Japanese Utility Model Laid-Open No. 3-13793 and a circuit unit for a TV game machine using the same are known.

In such a conventional shield structure of a printed circuit board, when two printed circuit boards are arranged close to each other in a vertical direction in a set of devices,
In order to further enhance the shielding effect of both substrates, a means for electrically contacting the shield plates attached to each substrate is employed.

That is, when two printed circuit boards are vertically assembled in a set, first, as shown in FIG. 4 and FIG. 4, two leaf springs 300 swelling toward the other shield plate 100 are fixed by soldering or the like.

In this state, when the two printed boards 1 and 2 are assembled into a set with the sides to which the shield plates 100 and 200 are fixed facing each other, the leaf spring 300 attached to the shield plate 200 causes the other printed board 100 In a state of being pressed against the surface. As a result, the two shield plates are connected via the leaf spring, and the shielding effect can be further enhanced.

[0010]

However, in such a conventional shield structure of a printed circuit board, an independent shield plate is attached to each of a plurality of printed circuit boards for shielding, so that there is a space for incorporating each shield plate. This is necessary in the set, and there has been a problem that the entire apparatus is enlarged accordingly. For this reason, such a conventional shield structure cannot meet a demand for a smaller and lighter device, particularly in an electronic device such as a TV game machine.

In the conventional shield structure, the printed circuit board and the shield plate are fixed by soldering, and the shield plates are brought into contact with each other using a leaf spring. However, the number of man-hours for manufacturing increases, and there is a problem that the production cost increases.

The present invention has been proposed in order to solve the problems of the conventional techniques, and a plurality of printed circuit boards are integrally and reliably shielded by a single shield plate. It is another object of the present invention to provide a shield structure for a printed circuit board that can easily be attached and detached.

[0013]

In order to achieve the above-mentioned object, a shield structure for a printed circuit board according to a first aspect of the present invention has a structure in which a plurality of printed circuit boards arranged vertically are provided between the plurality of printed circuit boards. And a plurality of board fixing means fixed to each of the plurality of printed boards, the plurality of board fixing means being provided on the upper and lower surfaces of the shield board main body. There is.

According to the shield structure of a printed circuit board of the present invention having such a configuration, the board fixing means of a single shield plate main body disposed between two printed circuit boards is fixed to a plurality of printed circuit boards. By doing so, a plurality of printed circuit boards can be shielded integrally.

This eliminates the need to shield a plurality of printed circuit boards with independent shield plates, saves space in a set in which the printed circuit boards are incorporated, and reduces the size and weight of the entire device. Can be.

In the shield structure for a printed circuit board according to a second aspect of the present invention, the board fixing means is formed integrally with the shield plate body by bending the periphery of the shield plate body.

According to the shield structure of the printed circuit board having such a structure, since the board fixing means can be integrally provided with the shield plate body, the structure of the shield plate becomes extremely simple, and the printed circuit board can be attached to each printed circuit board. Can be easily installed.

In the shield structure for a printed circuit board according to a third aspect of the invention, a through hole having a ground pattern is formed on the printed circuit board, and the shield plate body is penetrated through the through hole. Substrate contact means for contacting the ground pattern is provided in a protruding manner.

According to a fourth aspect of the present invention, there is provided a shield structure for a printed circuit board, wherein the substrate contact means makes contact with the through portion penetrating the through hole and the ground pattern formed around the opening of the through hole. It consists of and.

According to the shield structure of the printed circuit board having such a structure, the shield plate body is provided with the board contact means, and the printed board side is provided with the through hole through which the board contact means penetrates. Therefore, the shield of the printed circuit board can be easily strengthened simply by passing the circuit board contact means through the through hole. As a result, it is possible to easily strengthen the shield of the pudding substrate without soldering the shield strengthening means separate from the shield plate as in the conventional case.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a shield structure of a printed circuit board according to an embodiment of the present invention. FIG. 1 is an overall exploded perspective view showing an embodiment of the printed circuit board shield structure of the present invention. FIG. 2 is an enlarged front view of the shield structure of the printed circuit board shown in FIG. FIG. 3A is a schematic side view showing a substrate contact portion of the shield structure of the printed circuit board shown in FIG.
(B) is a schematic perspective view showing a through hole formed on a printed circuit board, through which the substrate contact means shown in (a) penetrates.

In these figures, reference numerals 1 and 2 denote printed circuit boards, which are incorporated in an electronic device set such as a TV game machine in a vertically close proximity to each other, and are one of a plurality of printed circuit boards provided in the set. Unit. Various electronic components are mounted on the surfaces of the printed boards 1 and 2.

Reference numeral 10 denotes a shield plate constituting the shield structure of the printed circuit board according to the present embodiment, which is disposed between the plurality of printed circuit boards 1 and 2 so that the printed circuit boards 1 and 2 are protected from external noise and the like. Shielding.

The shield plate 10 is a shield plate body 1
1 and a plurality of substrate fixing means 12. The shield plate body 11 includes printed circuit boards 1 and 2 to be shielded.
This is a plate-shaped member formed to have a size to cover each of the surfaces, and is formed of a member such as an aluminum plate or a copper plate similarly to a normal shield plate.

The substrate fixing means 12 comprises a shield plate body 11
A plurality of projections are provided on each of the upper and lower edges of the shield plate body 11, and serve as fixing means fixed to the respective peripheral edges of the pair of printed boards 1 and 2 disposed on the upper and lower surfaces of the shield plate body 11. As shown in FIGS. 1 and 2, the board fixing means 12 extends at arbitrary positions (four corners of the shield plate main body 11 in the present embodiment) on the peripheral edge of the shield plate main body 11 in the longitudinal direction. It is a plate-like member formed by bending the extended portion in the vertical direction of the shield plate main body 11, respectively.

That is, as shown in FIGS. 1 and 2, the bent portion of the board fixing means 12 is bent up and down in an L-shaped vertical section, and the peripheral edges of the printed boards 1 and 2 can be in surface contact with each other. In the figure, the one bent upward is the substrate fixing means 12a, and the one bent downward is the substrate fixing means 12b. Further, this substrate fixing means 1
The bent portion 2 is provided with a screw hole at a contact portion with the printed circuit boards 1 and 2 so that screws passing through the printed circuit boards 1 and 2 can be screwed.

In this embodiment, the substrate fixing means 12 is formed integrally with the shield plate body 11 by bending the periphery of the shield plate body 11. It can be provided as a body, and the number can be appropriately increased or decreased.

Further, in this embodiment, as shown in FIG. 3B, one of the printed circuit boards 1 and 2, ie, FIG.
A through hole 20 having a ground pattern 21 formed in the periphery of the opening is formed in the lower printed circuit board 2 in FIG. By extending a part of the periphery of the shield plate main body 11, the substrate contact means 13 that penetrates through the through hole 20 and contacts the ground pattern 21 on the periphery of the through hole 20 is formed.

As shown in FIG. 3A, the substrate contact means 13 is formed by extending a part of the periphery of the shield plate main body 11 and bending it toward the printed circuit board 2 side. And a contact portion 13b that contacts the ground pattern 21 around the opening of the through hole 20.

The penetrating portion 13a is formed by extending the center of the front end of the substrate contact means 13 so as to penetrate the through hole 20. Further, the contact portion 13b is provided with the substrate contacting means 1.
3 are formed so that both ends on the distal end side are shorter than the penetrating portion 13a and protrude longer than other portions. Thereby, the substrate contacting means 13 can make the tip of the contact portion 13b make point contact with the ground pattern 21 by the penetration portion 13a penetrating through the through hole 20.

The substrate contacting means 13 is provided to enhance the shielding effect of the electronic equipment. In the present embodiment, it is provided at one place.
Depending on the equipment to be shielded, it may be increased or decreased or omitted as appropriate.

When the substrate contacting means 13 is provided, the lower printed circuit board 2 is kept in contact with the shield plate 10 and the substrate fixing means 12 is reduced as long as the printed circuit board 2 is held in the set. It is also possible. Further, one or more of the plurality of substrate fixing means 12 may be omitted, and the substrate contact means 13 may be provided instead.

The shield structure of the printed circuit board according to the present embodiment having such a configuration is assembled as follows. First, on the upper surface of the shield plate main body 11, the printed circuit board 1 with the shielding surface facing the shield plate main body side is mounted, and the substrate fixing means 12 and the peripheral portion of the printed circuit board 1 are fixed by screwing. As a result, the printed board 1 is shielded by the shield plate 10.

Next, the printed circuit board 1 having the shield surface facing the shield plate body side is disposed on the lower surface of the shield plate body 11 by the same procedure, and the peripheral portions of the board fixing means 12 and the printed circuit board 2 are screwed. Fixed by. Thus, the printed circuit board 2 is also shielded by the shield plate 10, and the printed circuit boards 1 and 2 and the shield plate 1 are shielded.
0 is fixed integrally. At this time, the substrate contacting means 13 bent toward the printed circuit board 2 is in a state where the penetrating portion 13a at the tip penetrates the through hole 20 of the printed circuit board 2.

In this state, the integrated printed circuit board 1
And 2 are incorporated in a set of electronic devices (not shown). When the printed boards 1 and 2 are incorporated in the set, the upper printed board 1 presses the shield plate 10, so that the contact portion 13 b of the board contacting means 13 provided on the pressed shield plate 10 changes the lower printed board. Point contact is made with the ground pattern provided on the substrate 2. This further enhances the shielding effect of the electronic device.

As described above, according to the shield structure of the printed circuit board of the present embodiment, the printed circuit board can be shielded by the single shield plate 10 disposed between the two printed circuit boards. It is not necessary to shield the printed circuit board with an independent shield plate, and it is not necessary to contact each shield plate for strengthening the shield. As a result, it is possible to save space in the set in which the printed circuit board is incorporated, and it is possible to reduce the size and weight of the entire device.

Further, in the printed board shield structure of the present embodiment, all of the printed boards 1 and 2 and the shield plate 10 are mounted only by screwing. Substrate contact means 13
Also, the contact with the contact is performed by point contact by pressing, so that it is not necessary to employ a fixing means by soldering or the like as in the related art. As a result, the set assembling work is facilitated, and the attachment and detachment of the printed circuit boards 1 and 2 and the shield plate 10 can be easily performed.

[0038]

As described above, according to the shield structure of a printed circuit board of the present invention, a plurality of printed circuit boards can be integrally and reliably shielded by only a single shield plate, and the detaching operation can be easily performed. be able to.

[Brief description of the drawings]

FIG. 1 is an overall exploded perspective view showing one embodiment of a printed circuit board shield structure of the present invention.

FIG. 2 is an enlarged front view of the shield structure of the printed circuit board shown in FIG.

3A is a schematic side view showing a substrate contact portion of the shield structure of the printed circuit board shown in FIG. 1, and FIG.
It is a schematic perspective view which shows the through-hole formed in the printed circuit board which the board contact means shown in (a) penetrates.

FIG. 4 is an overall exploded perspective view showing a conventional printed circuit board shield structure.

5 is a partially enlarged front view showing a fixed portion between the printed circuit board and the shield plate in the conventional printed circuit board shield structure shown in FIG.

FIG. 6 is an enlarged front view showing a shield reinforcing means of the conventional printed circuit board shield structure shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Printed board 2 ... Printed board 10 ... Shield board 11 ... Shield board main body 12 ... Board fixing means 13 ... Board contact means 20 ... Through hole 21 ... Ground pattern

Claims (4)

[Claims] 1. A plurality of printed circuit boards arranged vertically, a shield plate main body disposed between the plurality of printed circuit boards, and a plurality of projecting projections on respective upper and lower peripheral edges of the shield plate main body. And a plurality of board fixing means fixed to each of the plurality of printed boards, the shield structure for a printed board. 2. The shield structure for a printed circuit board according to claim 1, wherein the board fixing means is formed integrally with the shield plate body by bending the periphery of the shield plate body. 3. A through hole having a ground pattern is formed on the printed circuit board, and a board contact means is provided on the shield plate body so as to come into contact with the ground pattern by penetrating the through hole. The shield structure for a printed circuit board according to claim 1 or 2. 4. The shield for a printed circuit board according to claim 3, wherein the board contact means includes a penetrating portion that penetrates the through hole and a contact portion that contacts the ground pattern formed around the opening of the through hole. Construction.