JPH02183979A - Earth plate for connector - Google Patents

Abstract

PURPOSE:To reduce the labor at the time of fitting a connector and improve the earth effect by fitting an earth plate with the preset shape in advance to the connector in response to the shape of the connector. CONSTITUTION:An earth plate 7 is pinched between the metal shell 13 of a connector 1 and the metal panel 8 of a device and formed in a shape that areas stuck to both of them are made large as much as possible and in a shape easy to handle when fitted. The earth plate 7 is formed with a thin metal spring material or the like by press machining. The earth plate 7 is provided with an escape hole 72 escaping the coupling section 14 of the connector 1 in contact with the connector 1, multiple tongue-shaped contact pieces 74 are provided in close contact with the metal panel 8, and both edge sections 71 are provided to prevent a hand from being hurt at the time of fitting. The earth plate 7 and the metal panel 8 are not required to be screwed.

Description

[Detailed Description of the Invention] [Summary] For interfaces with excellent electromagnetic shielding effects [Field of industrial application] The present invention relates to a connector for interfaces with excellent electromagnetic shielding effects, and in particular, to a connector for interfaces with excellent electromagnetic shielding effects. The present invention relates to a ground plate for a connector that improves the ground connection characteristics between the connector and a metal panel of a device.

With the spread of digital electronic devices in recent years, there are many opportunities for electromagnetic waves emitted from electronic devices to adversely affect the operation of other electronic devices.
It is important to take measures against agnetic interference (electromagnetic environment compatibility).

There is also an increasing demand for complete electromagnetic shielding for connectors that serve as interfaces between electronic devices and the outside world.

The attachment is a perspective view showing the structure.

In the figure, 1 is the connector mounted on the device, 2 is the mating connector to which the cable 5 is connected and inserted into the device connector 1, and 3 is the connector I on the device side mounted inside the device. The attached printed circuit board, 4, is a metal panel constituting the housing of the device, and 6 is a ground plate, which is held between the connector l on the device side and the metal panel 4.

Connector l is an insulator 1 in which multiple contacts 1 are implanted.
2 is covered with a metal shell 13, and a fitting part 14 protruding into a substantially trapezoidal shape that fits with the mating connector 2 on the front side.
The fitting part 14 has a panel abutting surface 15 around the base and mounting holes 16 at both ends, and the terminal part 11a of the contact protruding from the rear part is attached in a half-r-11 pattern to form a printed board. Installed and connected to 3.

When installing the printed circuit board 3 into the device, a grounding plate 6 having a plurality of tongue-like contact pieces 61 on both sides is placed between the connector 1 and the metal panel 4, and the opening 41 of the metal panel 4
The fitting part 14 is made to protrude from the metal panel 4, and the mounting holes 16 at both ends are fastened with setscrews 17 (having a lock receiving part for the mating connector 2 at the tip) to be attached to the metal panel 4.

The mating connector 2 includes an insulator 22 that protrudes and holds the contact portion of the male contact 21 from the front, and a trapezoidal metal that surrounds the contact portion and covers the outer periphery of the fitting portion 14 of the device connector 2. After the cable 5, which consists of a hood 23 and a metal cover 24 that protects the connection part of the cable 5 and covers a plurality of electric wires 51 with a braided shield, is connected, the metal cover 24 is connected to the outer periphery of the braided shield. metal hood 2
It is attached to 3. A convex portion 23a is provided on the inner surface of the metal hood 23 so as to be connected to the metal shell 13 that covers the outer periphery of the fitting portion 14 of the device side connector l.

In the interface connector having the structure and installation method described above, the braided shield of the cable is connected to the metal shell 13 of the connector 1 on the device side via the convex part of the metal hood 23 of the connector 2 on the cable side, and The panel contact tJ surface 15 of the shell 13 contacts the ground plate 6,
Since the ground plate 6 is connected to the metal panel 4 at multiple points via the tongue-shaped contact piece provided around the circumference, the environmental noise induced in the cable 5 is caused to fall to the frame ground of the device through the above-mentioned path. It has become.

In order to obtain good electromagnetic shielding characteristics with such a structure, it is desirable that the panel contact surface 15 of the metal shell 13 of the connector be in contact with the metal panel 4 of the device casing in as wide a range as possible. A ground plate 6 is interposed to improve contact performance.

The conventional grounding plate 5 has a flat spring material such as stainless steel with an opening 61 through which the fitting part 14 of the connector protrudes, and a plurality of tongue-shaped contact pieces 61 that are cut from the outer periphery and protrude toward the panel side. is forming.

[Problem to be solved by the invention]

Normally, this type of connector has a generally rectangular area, and a plurality of connectors are installed vertically in a device.

In this case, in order to reduce the arrangement pitch, there is a restriction on the widthwise dimension of the grounding plate 6, and in the conventional grounding plate 6 provided with the tongue-shaped contact pieces 11 that protrude in the width direction, the tongue-shaped contact pieces 11
1 length is limited. Therefore, the stiffness of the tongue-shaped contact piece 61 becomes large, and the height of the tongue-shaped contact piece 61 protruding from the metal panel surface cannot be increased very much.

Therefore, when the printed circuit board 3 on which the connector is mounted is positioned at a location not shown and installed inside the device, if there is a large gap between the panel contact surface of the connector and the inner surface of the metal panel due to accumulation of errors, etc. The protruding height of the tongue-shaped contact piece of the earth plate cannot cover the height of the protrusion, and the connector cannot be brought into reliable contact with the metal panel. Further, since the tongue-shaped contact piece protrudes toward the periphery of the thin plate and its tip is located at a position approximately equal to the outer shape of the ground plate, it is easily deformed during handling and may cause injury to hands. For this reason, it is not possible to attach the ground plate to the connector in advance, and when the printed board is assembled into the device as described above, each connector is screwed to the metal panel with the ground plate in between.

For this reason, connector manufacturers have taken the trouble to attach the ground plate to the connectors that are shipped, but equipment assemblers have to disassemble them and install them.
The problem is that it is necessary to remove the ground plate from the connector, mount it on the printed board, and then screw the individual connectors to the metal panel again when assembling the printed board into the device, and this screw tightening process is extremely troublesome. there were.

Furthermore, if the flatness of the panel contact surface 15 of the metal shell 13 of the connector is poor, the contact points between the ground plate and the connector will not be distributed over the entire surface of the panel contact surface, resulting in the problem that the electromagnetic shielding effect will be incomplete. there were.

The present invention has been created to solve the above problems, and it is possible to achieve a reliable ground connection between the connector and the metal panel without screwing each connector to the metal panel, thereby achieving an electromagnetic shielding effect. The purpose of this invention is to provide a grounding plate with excellent assembly workability.

[Means for solving the problem] The above problem is that the ground plate is sandwiched between the metal shell of the connector and the metal panel of the device, and the cross section with both widthwise edges bent toward the connector side is It is composed of a substantially rectangular frame-like member having a substantially U-shape, and has an opening from which the mating part of the connector protrudes, and a plurality of flat parts around the opening that protrude to the front and contact the inner surface of the metal panel. This problem is solved by the earth plate of the connector of the present invention, which is characterized by being provided with a tongue-like contact piece and a plurality of tongue-like contact pieces that protrude from the rear surface and come into contact with the metal shell.

[Effect]

Since the tongue-shaped contact pieces that contact the connector and the metal panel are provided on the flat part, these tongue-shaped contact pieces are inside the periphery of the ground plate and do not protrude in the direction of the outer shape, so they can easily get caught and deform when handled. It becomes difficult to apply external force that causes Therefore, the stiffness can be reduced, the protrusion height can be increased, and the contact follow-up amount can be made thicker. Even if the gap between the metal panel and the metal panel varies greatly, the ground plate can be reliably connected to the metal panel and the metal shell of the connector. can be brought into contact.

In addition, since both edges are bent into a U-shape, there is less chance of deformation or injury to hands even with a thin spring material, so it is possible to attach a ground plate to the connector in advance, and when assembling the device. No need to tighten screws.

Therefore, by simply attaching a plurality of connectors together with a ground plate to a printed board and then attaching the printed board to the device, the tongue-like contact piece can be reliably contacted to the metal panel of the device. Screws for individual connectors are no longer required.

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the grounding plate of the present invention.

The grounding plate 7 of the present invention comprises the metal shell 1 described above in FIG.
It is configured so that it can be mounted on a printed board 3 by covering the front side of the connector 1 on the device side having the connector 3. Reference numeral 8 denotes a metal panel of the device housing, which has an opening 81 for exposing from the surface a fitting portion of a connector inside the device mounted on a printed circuit board and a set screw 17 which also serves as a lock receiver.

The ground plate 7 is made of a pressed product made of a metal spring material such as a thin stainless steel plate, and has a substantially U-shaped cross section with both edges 71 in the width direction bent toward the connector l side, and is located at the fitting portion of the connector l. It is a substantially rectangular frame-shaped member provided with, for example, a trapezoidal opening 72 passing through the hole 14 and an escape hole 73 through which the set screw 17 passes. A plurality of tongue-shaped contact pieces 74 are provided on the flat portions 75 on both sides in the width direction of the opening 72, and a plurality of tongue-like contact pieces 74 are provided on the front side and come into contact with the inner surface of the metal panel 8 of the device housing, and a plurality of tongue-like contact pieces 74 are provided on the flat parts 75 on both sides in the width direction of the opening 72, and a plurality of tongue-like contact pieces 74 are provided on the flat parts 75 on both sides in the width direction of the opening 72. A plurality of tongue-like contact pieces 76 that contact the panel contacting surface 15 are appropriately distributed along the longitudinal direction of the opening 72. In the illustrated case where the tongue-like contact pieces 74 and 76 form a cantilever spring in the substantially longitudinal direction of the ground plate 7, the spring length can be determined without being restricted by the width of the ground plate 7. It is most desirable because it is easy to set the stiffness and protrusion height to desired values, but the direction of the cantilever is not limited as long as it does not protrude from the flat part.

Furthermore, if the tip of the tongue-like contact piece is bent slightly inward to form a substantially doglegged shape, the tip will be more difficult to get caught, which is effective against deformation.

When the printed circuit board 3 on which the connector l and the ground plate 7 are mounted on its upper side is installed inside the device, the ground plate 7 is inserted between the metal shell 13 of each connector and the metal panel 8 of the device housing. The connector l is securely connected to the ground plate 7 via the tongue-shaped contact pieces 76 at multiple locations, and is also securely connected to the device casing via the tongue-shaped contact pieces 74 to provide good electromagnetic shielding. Ru.

Since the tongue-shaped contact pieces 74 and 76 do not protrude from the outer periphery of the ground plate, they do not deform and can be handled all at once by being attached to the connector l with the setscrew 17 as shown in the figure. In addition, simply by attaching a printed board on which multiple connectors are mounted together with a ground plate into the metal panel of the device, the tongue-like contact pieces of each ground plate will make good contact with the metal panel. The assembly process of the device can be streamlined as there is no need to screw it in place.

[Effects of the Invention] As described above, the ground plate of the present invention can be mounted simultaneously when printed connectors are mounted, and there is no need to fasten each connector to the metal panel of the device housing. Therefore, it is possible to reduce the number of steps required to assemble the device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a grounding plate according to the present invention, and FIG. 2 is a perspective view showing connector attachment using a conventional grounding plate. In the figure, 1--connector, 11--contact, 1
2.-insulator, 13-metal shell, 14-.
Mating part, 2-Mating connector, 21-Contact, 22-Insulator, 23-Metal hood, 24-Metal case, 3--Printed board,
4, 8--metal panel, 41...-opening,
5-cable, 6, 7. ---Earth plate,
71 - both edges, 72 - opening, 74 - tongue-shaped contact piece, 75 - flat part, 76 - tongue-shaped contact piece, 81 - opening. Oh ＼ Graduation Day and Month A7Ji! 15', Su Xu Niuri Milk g〕early
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Claims (1)

[Claims] A ground plate (7) sandwiched between the metal shell (13) of the connector (1) and the metal panel (8) of the device, with both edges (71) in the width direction bent toward the connector (1). It consists of a substantially rectangular frame member whose cross section is substantially U-shaped, and includes an opening (72) from which the fitting portion (14) of the connector (1) protrudes, and the periphery of the opening (72). The flat part of (
75), a plurality of tongue-like contact pieces (74) protruding from the front surface and contacting the inner surface of the metal panel (8), and a plurality of tongue-like contact pieces (74) protruding from the rear surface and contacting the metal shell (13). 76) A grounding plate for a connector, characterized in that it is provided with: