JPH0672296U - Mounting structure for connector part for cartridge attachment / detachment - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a noise reduction structure of a connector portion against leaked radio waves used in electronic equipment products, and provides a structure for reducing noise generated on the lower surface of a card edge connector. In a connector portion 5 fixed to the surface of an electronic circuit board 4 for attaching and detaching an external cartridge containing software, between the electronic circuit board 4 and a shield plate 9 covering the entire back side of the electronic circuit board 4. The non-conductive holder 10 is attached to the electronic circuit board 4 on the back side of the mounting position of the electronic circuit board 4 of the connector portion 5.
The back side of the shield plate 9 with which is contacted is a mounting structure for a connector part for cartridge attachment / detachment, which is integrated from the connector part 5 to the base 8 provided on the outer case 7 of the electronic device and fixed by the fixing means 11. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for preventing noise in a connector portion against leaked radio waves used in electronic equipment products.

[0002]

[Prior art]

 Conventionally, high-frequency signals are generated in electronic devices such as computers to generate noise, which affects external electronic devices. Therefore, various measures have been taken to prevent the noise. Generally, a shield plate that covers the electronic substrate is used in equipment for Europe and the United States.

FIG. 5 is an exploded perspective view of a conventional home video game machine without a top cover. FIG. 6 shows an exploded perspective view of a card edge connector portion as a conventional technique, and FIG.

In a home-use video game machine, in order to play a game using a game cartridge (not shown) which is composed of a ROM storing game software, the game cartridge is loaded onto the electronic circuit board 01 of the game machine main body. A horizontally long card edge connector 02 is provided to receive the program. The card edge connector 02 is fixed to the electronic circuit board 01 by soldering. The electronic circuit board 01 is provided with a rectangular top shield plate 03 from the upper side, and further, a bottom shield plate 05 for shielding noise generated from the electronic circuit board 01 is attached to the bottom case 04 of the game machine body. The electronic circuit board 01 is fixed to the bottom case 04 together with the top shield plate 03 with screws 06.

At present, when a user inserts a game cartridge (not shown) into the card edge connector 02, a vertically downward insertion force is applied to the electronic circuit board 01, so that a horizontal rectangular shape is formed on the inner bottom surface 04a of the bottom case 04. The ribs 04b are provided upright to support the electronic circuit board 01 from the inner bottom surface 04a and prevent it from being damaged.

[0006]

[Problems to be solved by the device]

 Therefore, it is necessary to provide a slit 05a in the bottom shield 05 in order to pass the bottom shield plate 05 through the horizontally long rib 04b provided upright on the bottom case 04, and noise generated in the electronic circuit board 01 leaks from this slit 05a. There was a problem. Therefore, the present invention is to provide a structure for reducing the noise generated on the lower surface of the card edge connector.

[0007]

[Means for Solving the Problems]

 In the connector portion fixed to the surface of the electronic circuit board for attaching and detaching the external cartridge containing the software, the electronic part of the connector portion is provided between the electronic circuit board and the shield plate covering the entire area on the back side of the electronic circuit board. A non-conductive holder is placed on the electronic circuit board on the back side of the mounting position of the circuit board, and the back side of the shield plate with which the holder contacts is integrated from the connector to the base on the base provided in the outer case of the electronic device. The cartridge is attached and detached by a fixing means such as screws. The fixing means for fixing the connector portion fixed to the surface of the electronic circuit board to the base of the outer case through the holder and the shield plate in order is to screw each member to the base and screw it to the base.

[0008]

[Action]

 The operation of the above configuration will be described. As a result, the entire area on the back side of the electronic circuit board is shielded, and high-frequency noise generated from the electronic circuit board is extremely unlikely to leak from the back side of the electronic circuit board. Furthermore, since the card edge connector is fixed to the outer case of the electronic device, the force applied when the external cartridge is attached or detached does not apply an unreasonable deformation force to the electronic circuit board.

[0009]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external perspective view of a home-use television game machine. In general, the home video game machine 1 is made of hard resin on the outside, and the board end 2a of the game cartridge 2 is attached to the game machine body 3 for playing. The game cartridge 2 has a built-in ROM containing game software.

FIG. 2 is an exploded perspective view of the home video game machine having a card edge connector noise reduction structure, excluding the upper lid. FIG. 3 is an exploded perspective view of the card edge connector portion, and FIG. The electronic circuit board 4 of the game machine body is provided with a horizontally long card edge connector 5 for connecting a game cartridge, and the board edge 2a of the game cartridge 2 is inserted into the card edge connector 5 as shown in FIG. Has become. The card edge connector 5 is fixed to the electronic circuit board 4 by soldering. A rectangular top shield plate 6 is attached to the electronic circuit board 4 from above.

On the inner bottom surface 7 a of the hard resin bottom case 7 of the game machine main body, a rectangular base 8 is provided at the bottom surface position of the card edge connector 5. The base 8 is formed with a rectangular enclosure wall 8a having a size surrounding the periphery of the bottom area of the card edge connector. Cylindrical ribs 8b higher than the peripheral wall are provided inside both ends of the peripheral wall 8a in the longitudinal direction. Horizontally long ribs 8c which are horizontally long and have the same height as the peripheral wall are erected between the cylindrical ribs 8b. The wall thickness of the peripheral wall 8a and the laterally long rib 8c is almost the same as the wall thickness of the bottom case 7, so that the bottom case 7 can be molded without distortion during molding.

A bottom shield plate 9 for shielding noise generated from the electronic circuit board 4 is in contact with the base 8, and a bottom hole of the bottom shield plate 9 at the position of the cylindrical rib 8 b of the base 8 has a screw hole. 9a is open. The bottom shield plate 9 is a metal material or a conductive material such as cardboard with aluminum foil all over the surface. It is a box with a small bottom, which is slightly smaller than the electronic circuit board 4, and surrounds the edge of the box. The inner edge portion 9b and the outer edge portion 9c having a horizontal step are provided on each of the two adjacent sides of the four sides. The step is aligned with the edge of the electronic circuit board 4, and the difference s between the steps is the thickness of the electronic circuit board. Accordingly, the electronic circuit board 4 is mounted on the inner edge portion 9b, and the top shield plate abuts on the outer edge portion 9c. Each of the remaining two sides is provided with a horizontal edge portion 9d at the height of the inner edge portion 9b. A part of the outer edges of the outer edge portion 9c and the edge portion 9d is bent upward to form a vertical side portion 9e. The vertical side portion 9e is provided for each side. The outer edge 9c of the bottom shield plate 9 is sized to fit in the bottom case 7, and the inner edge 9b is screwed to a cylindrical rib 7b provided near each corner of the inner bottom surface 7a of the bottom case 7. ing.

Next, on the upper side of the screw hole 9a of the bottom shield plate 9, a rectangular holder having a shape in which the height of the cylindrical rib 8b is removed from the base 8 made of a non-conductive material such as a hard resin. -10 is located. The holder 10 has a shallow bottom surrounded by peripheral walls 10a on four sides, and screw holes 10a are provided at both ends in the length direction so as to match the screw holes 9a of the bottom shield plate 9, and a horizontal rib 10c is provided at the center in the length direction. Are arranged. The height of the holder 10 is the distance from the bottom surface of the bottom shield plate 9 to the inner edge portion 9b. The electronic circuit board 4 is mounted on the inner edge portions 9b and 9c of the bottom shield plate 9 by plating. Two screw holes 4a for attaching the card edge connector 5 are opened in the electronic circuit board 4 just above the base 8 of the bottom case 7. The distance between the two screw holes 4a is the distance between the cylindrical ribs 8b on both sides of the base 8. On both sides of an imaginary line connecting the two screw holes 4a of the electronic circuit board 4, a plurality of small holes 4b into which the connection terminals on the lower surface of the card edge connector 5 are mounted are arranged in parallel in two rows at regular intervals. is doing.

A horizontally long rectangular card edge connector 5 is attached to the screw holes 4 a and the small holes 4 b of the electronic circuit board 4. The card edge connector 5 has screw holes 5a at both ends in the length direction, a slit-shaped opening 5b on the upper surface, the bottom of the slit-shaped opening 5b has an inner bottom surface, and the inside of the slit-shaped opening 5b is It has a plurality of pairs of connection terminals 5c arranged vertically inward at even intervals over both sides in the length direction. On the lower surface of the card edge connector 5, a plurality of pairs of connection terminals 5c, which are inserted into the small holes 4b of the electronic circuit board 4 and soldered, project.

In the card edge connector 5, the plurality of pairs of connection terminals 5c are inserted into the small holes 4b of the electronic circuit board 4, the screw holes 5a at both ends of the card edge connector 5 are aligned with the screw holes 4a of the electronic circuit board, and the electronic parts are crimped. It is fixed to the circuit board 4. Then, the card edge connector 5 is fixed by soldering the connection terminals 5c on the lower surface to the electronic circuit board 4. Next, insert the screws 11 through the screw holes 5a at both ends of the card edge connector 5, apply the holder 10 to the lower side of the electronic circuit board 4, and place the bottom shield plate 9 in this order in the cylinders at both ends of the base 8 molded into the bottom case. It is screwed to the shaped rib 8b.

The projecting portions of the connection terminals 5c of the card edge connector are accommodated in the gaps on both sides of the horizontally long rib 10c of the holder 10. In this state, the peripheral end surface 4c of the electronic circuit board is in contact with the ribs 7c provided upright around the end of the inner bottom surface 7a of the bottom case 7 with the bottom shield plate 9 interposed.

The game cartridge 2 shown in FIG. 1 is vertically inserted from the upper side into the plurality of pairs of connection terminals inside the slit-shaped opening 5b, and is pressed against the board end 2a of the game cartridge. Then, the game cartridge is sandwiched and held in pressure contact by the elastic force of the connection terminal in the inward direction.

The top shield plate 6 is made of a metal material or a conductive material such as a cardboard having an aluminum foil over the entire surface in order to cover various electronic components mounted on the surface of the electronic circuit board 4. The box is bent in a letter shape, and the height h of its ceiling is higher than the height of various electronic components mounted on the electronic circuit board 4. A rectangular opening 6a is provided in the ceiling of the top shield plate just above the card edge connector of the electronic circuit board 4. In addition, horizontal edges 6b are provided on each part of the four sides around the edge of the box body of the top shield plate 6, and the outside of the edge 6b is divided into a rake shape and is directed diagonally upward and outward. It is a bent rake part 6c.

The edge portion 6b is in contact with the peripheral end surface 4c of the electronic circuit board 4, is in contact with the outer edge portion 9c of the bottom shield plate 9 outside the peripheral end surface 4c, and the rake portion 6c is the vertical side portion of the bottom shield plate. Press the inside of 9e. Then, the electronic circuit board 4 and the bottom shield plate 9 are screwed into the ribs 7c erected around the inner bottom surface of the bottom case 7 by inserting screws 12 from the screw holes 6d provided in the edge portion 6b of the top shield plate 6 and inserting them. Will be stopped.

With the above structure, the card edge connector 5 on the electronic circuit board is fixed to the base 8 of the bottom case 7 with the holder 10 interposed and the bottom shield plate 9 interposed therebetween. A bottom shield plate 9 is provided on the entire lower side of the electronic circuit board 4, and is fixed to the bottom case 7 together with the electronic circuit board 4. As a result, the entire lower side of the electronic circuit board 4 is shielded except for the screw holes 9a of the bottom shield plate 9, and it is extremely likely that high frequency noise generated from the electronic circuit board 4 leaks out from the lower side of the electronic circuit board. It will decrease. Further, the top shield plate 6 and the bottom shield plate 9 not only sandwich the electronic circuit board from above and below, but are also brought into contact with the vertical side portion 9e of the bottom shield 9 by the rake portion 6c of the top shield plate 9 and the electronic circuit board 4 The shield effect increases.

In our test, the insertion force for inserting the game cartridge 2 of the card edge connector 5 is about 6 kg, and the removal force is about 4.5 kg, and the electronic circuit board to which the card edge connector 5 is fixed. If 4 is not fixed, it will cause damage to the electronic circuit board 4. In the present invention, since the card edge connector 5 is fixed to the bottom case 7, the electronic circuit board 4 is not damaged by the force received when the game cartridge 2 is attached or detached.

[0022]

[Effect of device]

 To describe the effect of the above configuration, the rib supporting the card edge connector fixed to the electronic circuit board does not open the bottom shield, so high-frequency noise generated from the electronic circuit board can leak to the lower side of the electronic circuit board. Since it is extremely small, the shield effect is increased. Therefore, the noise is reduced by effectively shielding the part where a great deal of force is applied when attaching or detaching the cartridge such as the card edge connector.

Further, the top shield plate and the bottom shield plate not only sandwich the electronic circuit board from above and below, but are also brought into contact with the vertical side portion of the bottom shield by the rake portion of the top shield plate, so that the shield effect of the electronic circuit board is improved. It will rise.

[Brief description of drawings]

FIG. 1 is an external perspective view of a home video game machine.

FIG. 2 is an exploded perspective view of a home video game machine having a card edge connector with a noise reduction structure, excluding an upper lid.

FIG. 3 is an exploded perspective view of a card edge connector portion.

FIG. 4 shows a partially cutaway sectional view of a card edge connector.

FIG. 5 is an exploded perspective view of a conventional home video game machine with an upper lid removed.

FIG. 6 is an exploded perspective view of a card edge connector portion as a conventional technique.

FIG. 7 is a partially broken sectional view of a card edge connector portion as a conventional technique.

[Explanation of symbols]

 1 ... Home video game machine 2 ... Game cartridge 2a ... Board end 3 ... Game machine body 4 ... Electronic circuit board 4a ... Screw hole 4b ... Small hole 4c ... Perimeter end face 5 ... Card edge connector 5a ... Screw hole 5b ... Slit-shaped opening 5c ... Connection terminal 6 ... Top shield plate 6a ... Opening 6b ... Edge 6c ... Rake part 6d ... Screw hole 7 ... Bottom case 7a ... Inner bottom surface 7b ... Cylindrical rib 7c ... Rib 8 ... Base 8a ... Enclosure 8b ... Cylindrical Shaped rib 8c ... Horizontal rib 9 ... Bottom shield plate 9a ... Screw hole 9b ... Inner edge 9c ... Outer edge 9d ... Edge 9e ... Vertical side 10 ... Holder 10a ... Peripheral wall 10b ... Screw hole 10c ... Horizontal rib 11 ... Screw 12 …screw

Claims (2)

[Scope of utility model registration request] 1. A connector portion fixed to the surface of an electronic circuit board for attaching and detaching an external cartridge containing software, wherein the connector is provided between the electronic circuit board and a shield plate covering the entire back side of the electronic circuit board. A non-conductive holder is attached to the electronic circuit board on the back side of the mounting position of the electronic circuit board, and the back side of the shield plate with which the holder abuts is connected to the base provided in the outer case of the electronic device from the connector section. An attachment structure of a connector portion for attaching / detaching a cartridge, which is integrated with a base and fixed by a fixing means. 2. The fixing means for fixing the connector portion fixed to the surface of the electronic circuit board to the base of the outer case through the holder and the shield plate in this order is provided with screw holes in each member to connect the connector portion to the base. Mounting structure of connector part for cartridge attachment / detachment characterized by screwing.