JPH0635403Y2 - Connector and cable connection structure - Google Patents

Description

[Detailed Description of the Invention] [Outline] Concerning the connection structure of the connector and the cable, by providing a ferrite core for preventing electromagnetic interference noise, the conductive connection between the conductive case connected to the connector and the shield layer of the cable is effective. The shield layer of the cable is covered with an annular ferrite core and the shield layer is folded back from the inside of the ferrite core to the outside of the ferrite core for the purpose of making a proper connection. The peripheral portion and the inner surface of the conductive case are electrically connected.

[Industrial application field]

 The present invention relates to a connector / cable connection structure.

Cable connection with a connector to electronic / communication equipment is necessary for modularization and unitization of equipment, and simplification of design, manufacturing, maintenance, etc. by unitizing equipment into an appropriate configuration In addition, efficiency can be improved and high-density mounting can be achieved.

In recent years, various measures have been taken to prevent the electromagnetic interference noise from being emitted from the device or being prevented from entering the device due to the problem that the electromagnetic interference noise causes malfunction of the device. Therefore, it is necessary to take sufficient measures against discharge or intrusion from the connecting portion of the connector or the cable.

[Conventional technology]

The connector 1 shown in the cross-sectional view of FIG. 3 is covered with a metal case 3 in which a connecting portion 2 having a plug structure is opened, and a cable 4 connected to the connector 1 has a shield layer 5 for electromagnetic shielding. It is a shielded cable. The shield layer 5 is formed of a braid in which thin copper wires are braided in a cylindrical shape, and the inner coated conductor wires 6 are collectively shielded.

In order to connect the cable 4 to the connector 1, first, the outer jacket 7 at the end of the cable 4 is peeled off by a predetermined length to expose the shield layer 5, and then the shield layer 5 is folded back to expose the exposed coated conductor wire 6. Are connected to the terminals of the connector 1. After the connection between the cable 4 and the connector 1 is completed, the metal case 3 is brought into contact with the shield layer 5 of the cable 4 and attached and fixed to the connector 1. In this state, a housing 9 made of synthetic resin is molded outside the metal case 3 to integrate the metal case 3 and the cable 4.

[Problems to be solved by the device]

The connector with a cable as described above is shielded against electromagnetic interference noise by the metal case 3 and the shield layer 5 of the cable 4, and is prevented from entering the inside of the device or being discharged outside the device. However, since the cable 4 can be freely bent, the braid density of the shield layer 5 changes,
The shielding effect by the shield layer 5 becomes insufficient, and there is a problem that electromagnetic interference noise enters or is emitted through the cable 4. In addition, the jacket 7 of the cable 4
However, there is a problem that the contact state between the shield layer 5 and the metal 3 which is flexible and folded back is changed, so that the shield is not reliably shielded due to a change in a gap or a contact point.

An object of the present invention is to reliably prevent electromagnetic interference noise from entering the device via a cable or being emitted to the outside of the device.

[Means for Solving the Problems]

Means of the present invention for this purpose is a connector-cable connection structure that comprises a conductive case that covers the connector and is conductively connected to the shield layer of the cable connected to the connector. A ring-shaped ferrite core is covered, and the shield layer is folded back from the inside of the ferrite core to the ferrite core so that the peripheral portion covered by the folding and the inner surface of the conductive case are conductively connected. The above object is achieved by the connector and cable connection structure characterized by the above.

[Action]

Electromagnetic interference that enters the device through the cable or is emitted to the outside of the device is attenuated and blocked by the ferrite core with the cable end attached, and the shield layer is folded back to the outside of the hard ferrite core. As a result, the contact with the conductive case is strong and reliable, and the reliability of the contact state at this portion is good.

〔Example〕

The constituent means of the present invention will be described in detail below with reference to the drawings by way of specific embodiments.

1 and 2 are cross-sectional views of an embodiment of the present invention. The same parts are designated by the same reference numerals throughout the drawings. The connection structure of the connector and cable of the present invention is shown in FIG. 1, which is a conductive case having an electromagnetic shielding effect, that is, a metal case 3 and a connecting portion 2 such as a plug.
The connector 1 having an open side, the cable 4 which inserts the end portion into the metal case 3 to connect the plurality of covered conductors 6 to the terminals of the connector 1, and the covered conductor 6 attached in the metal case 3 collectively. And a ring-shaped ferrite core 10 which is penetrated.

The ferrite core 10 is arranged so as to be in contact with the end portion of the jacket 7 of the cable 4 and to be fitted to the outside of the shield layer 5 covering the conducting wire 6, and in this state, the shield layer 5 is folded back to the ferrite core 10. The outside of the core 10 is covered. In this way, the periphery of the shield layer 5 on the outer periphery of the ferrite core 10 is brought into contact with the inner surface of the conductive metal case to be conductively connected. In addition, reference numeral 9 is a housing that is molded by the same synthetic resin as the conventional one. The ferrite core 10 has the effect of increasing the impedance between FG (frame ground) for various conductors 6 such as power supply lines and signal lines, reducing the outflow of noise current, and suppressing the noise component conducted and emitted. is there. That is, the signal line and its return line,
By passing the power supply side and the OV side at once to the ferrite core 10, the magnetic flux in the ferrite core 10 is canceled by the going and returning currents, and there is no adverse effect on the original signal or power supply, but the ferrite With respect to one-way noise (common-mode noise) seen from the core 10, the magnetic flux is not canceled, and therefore the current is limited by the impedance of the ferrite core, and as a result, noise conduction and radiation are reduced.

In this way, by providing the ferrite core 10, electronic interference noise is blocked at the end of the cable on both the ingress side and the emission side, and no adverse effect is exerted on either the electronic circuit in the device or the external device. Furthermore, since the ferrite core 10 is hard, the metal case 3 can be brought into close contact with the surrounding shield layer 5 that is folded back, and the state of this contact portion can be made stable and reliable. can do.

In the partially broken connector shown in the embodiment of FIG. 2, the housing 11 is made of two metal or plastic molded parts plated with metal for imparting conductivity.
The connector 1 is attached when combining and integrating from both sides. In the same manner as in the previous embodiment, the annular ferrite core 10 is arranged outside the shield layer 5 in the state where the jacket of the cable 4 is peeled and removed, and the ferrite core 10 is brought into contact with the end of the jacket. The shield layer 5 is folded back and put over the ferrite core 10.

The covered conductor 6 is connected to the terminal of the connector 1, and the shield layer 5
The ferrite core 10 covered with is fitted into the accommodation recess 14 on the introduction side of the housing 11, and the two housings 11 are fastened together with the screws 12 to integrate the shield layer 5 into the housing.
Conductive connection with 11. At this time, the shield layer 5 is tightened by the housing 11 and closely fixed to the ferrite core 10, and the cable 4 and the housing 11 are joined to clamp the cable 4.

[Effect of device]

As described above in detail, according to the connector / cable connection structure of the present invention, the external electromagnetic interference noise enters the device through the cable, and the cable of the electromagnetic interference noise component generated in the device is prevented. Radiation through is greatly suppressed.

Also, by folding the shield layer around the ferrite core and contacting it with a conductive case, the shield layer can be brought into close contact between the ferrite core and the case, and a strong and stable electrical connection with the case. Can be done.

If the conductive case is a combination type,
By tightening the shield layer from both sides through the ferrite core, the cable can be fixed to the case together with the conductive connection, and no special cable fixing structure is required, so it can be miniaturized as a connector with a simple cable fixing structure. .

As described above, according to the present invention, various excellent effects are exhibited, and the practical effects are extremely remarkable.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a connector / cable connection structure of the present invention, FIG. 2 is another embodiment, and FIG. 3 is a sectional view of a conventional connector / cable connection structure. In each figure, 1 is a connector, 2 is a connection part, 3 is a metal case, 4 is a cable, 5 is a shield layer, 6 is a conductor wire, 7 is a jacket, 9 and 11 are housings, 10 is a ferrite core, and 12 is a screw. ,.

Claims (1)

[Scope of utility model registration request] 1. A connector-cable connection structure comprising a conductive case which covers the connector (1) and is conductively connected to the shield layer (5) of the cable (4) connected to the connector, The shield layer (5) of the cable (4) is covered with an annular ferrite core (10), the shield layer is folded back from the inside of the ferrite core to the outside of the ferrite core, and the folded and covered peripheral portion is covered. A connecting structure for a connector and a cable, characterized in that it is electrically connected to the inner surface of the conductive case.