JPS5934061Y2 - cable connector - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a cable connector.

The conventional connector has a signal cable 1 as shown in Figure 1.
Consists of connector 2 on the side and connector 3 on the device side.
Generally, the signal line 1a of the signal cable 1 and the shield jacket 1b are connected to the connector 2 side as shown in FIG.

The connector 2 shown in FIG. 1 has a terminal mounting member 6 shown in FIG. 2 covered with a connector metal fitting 4 and a connector metal fitting 5 (single body shown in FIG. 3), and the connector 2 is pushed into the connector 3. By connecting, the contact spring portions 7a of the signal line connection terminals 7 shown in FIG.
... is the signal line connection terminal 8 of the connector 3 in Fig. 1.
The contact spring portions 8a of .
. . . and the shield jacket 1b are transmitted to the signal line connection terminal 8 of the connector 3, from which signal lines are connected and wired to each part of the device, and the shield jacket 1b is also connected to the connector 3.
The signal line connection terminal 8 is connected to the metal casing of the device by a lead wire such as a wire.

In addition, the shield outer sheath of signal cable 1 must be connected to connector 2.
, the contact spring portions 7a of the signal line connection terminals 7 and 8 of the connector 3
, 8a, a lead wire such as a stranded wire connected to the shield jacket 1b is pulled out to the outside of the connector fitting 4 of the connector 2, and a configuration example is also known in which the lead wire is directly connected to the metal casing of the device.

In any case, in such a configuration, the seed jacket 1b of the signal cable 1 is connected to the metal casing of the device using a lead wire such as a stranded wire.

However, since the noise coming to the signal cable 1 has many high frequency components, the shield jacket of the signal cable is made of aluminum foil, copper foil, or a braided shield to keep the high frequency impedance as low as possible. In the configuration in which the shield outer sheath 1b is connected to the metal casing of the device via a lead wire such as a stranded wire at the connector portion as described above, the high frequency impedance of this portion increases due to the skin effect or the like.

For this reason, when the signal cable 1 is connected to a device using a connector, if common mode noise with high frequency components is added between the metal casing of the device and the signal cable, the lead wires such as stranded wires will become louder. A voltage drop occurs, and a large potential difference occurs between the metal casing and the shield jacket 1b of the signal cable 1, and the signal line 1a surrounded by the shield jacket 1b of the signal cable 1 also... Due to capacitive coupling due to stray capacitance, a large potential difference occurs in the circuits inside the metal casing of the device, causing malfunction.

Due to this operation, even if a conventional connector uses a signal cable with a shielded jacket, the high frequency impedance of the shielding system at the connector becomes high and a sufficient shielding effect cannot be achieved.

Therefore, the purpose of this invention is to provide a cable connector for connecting a signal cable with a shield jacket for electrical signal transmission to a device housing, which lowers the impedance of the shield system and improves the shielding effect of the signal cable. An object of the present invention is to provide a cable connector that can improve the noise resistance of a signal cable.

An embodiment of this invention is shown in FIGS. 4 and 5.

That is, this cable connector has a terminal mounting member 12 to which a plurality of signal line connection terminals 11 are fixed, and a cable insertion hole 14 surrounded by a portion of the collar 13 for the shield outer covering. A cylindrical conductive inner case 15 with a bottom that covers the terminal mounting member 12 and a collar part 16 for clamping the shield outer cover, into which the shield outer cover cap collar part 13 is inserted. The shield jacket 1b of the signal cable 1, which has a collar insertion hole 17 in its bottom part and is fitted onto the conductive inner case 15 and inserted into the cable insertion hole 14, is inserted into the shield of the conductive inner case 15. A collar part 13 for the outer covering and a collar part 16 for clamping the shield outer covering.
and a bottomed cylindrical outer case 18 which is sandwiched between the two.

The terminal attachment member 12 is made of an insulating material such as plastic, and is attached to the connection terminal portion 11a of the signal line connection terminal 11.
The upper part 12a from which the upper part 12a protrudes has a rectangular T-shaped cross section, and the signal line connecting terminal 1 is provided in the lower half part 12b of the upper part 12a.
The signal line connection terminals 11 are arranged so that one contact spring portion 11b is exposed.

The conductive inner case 15 is made of a conductive metal material such as a copper plate, and has a cylindrical shape with a rectangular cross section to match the outer shape of the upper half 12a of the terminal mounting member 12.

Similarly, the outer case 18 is connected to the conductive inner case 15.
It has a cylindrical shape with a rectangular cross section that can be fitted onto the outer surface of the conductive inner case 15, and the collar part 16 for clamping the shield outer covering is aligned with the cylindrical shield outer covering collar part 13 formed on the conductive inner case 15. It has a cylindrical shape.

To connect signal cable 1 to this cable connector,
Do it as follows.

In advance, each case 15.18 is inserted into one end of the signal cable 1 in the order of the outer case 18 and the conductive inner case 15, and then each signal line 1a of the signal cable 1 is inserted into the signal cable 1.
The signal line connection terminals 11 protruding from the upper half 12a of the terminal attachment member 12 are soldered.

Shield jacket 1b exposed at the end of signal cable 1
is folded back to the cable jacket 1c side, and this shield folded part becomes the shield jacket crown collar part 1 of the conductive inner case 15.
3 so that the terminal mounting member 12
The conductive inner case 15 is attached and covered.

Next, the shield folded portion of the shield outer cover 1b is folded back to the outside so that its tip portion covers the shield outer cover crown collar part 13, and the outer case 18 is then attached to the conductive inner case 15. Fit externally.

In this way, the shield outer cover 1b is sandwiched between the shield outer cover crown collar part 13 of the conductive inner case 15 and the shield outer cover clamping collar part 16 of the outer case 18, and the The shield jacket 1b is crimped onto the case 15.

This cable connector is connected to the housing side connector 3 shown in FIG. 1, which is directly attached to the metal housing of the device shown in the conventional example.
1 and the contact spring part 8a of the signal line connection terminal 8 of the housing connector 3 fit into contact with each other, and the conductive inner case 15 contacts the outer conductive surface 3a of the housing connector 3.
The shield outer sheath 1b is connected to the metal casing via the conductive inner case 15 and the outer conductive surface 3a of the casing-side connector 3.

Note that the connection between the outer conductive surface 3a of the housing connector 3 and the metal casing is achieved by screwing the mounting piece 9 formed protruding from the outer conductive surface 3a of the housing connector 3 to the metal housing. The connection is made via the attachment piece 9.

With this configuration, the shield jacket 1b of the signal cable 1 can be connected to the metal casing from the outer conductive surface of the casing side connector via the conductive inner case 15 without going through the signal line connection terminal 11, It is possible to significantly reduce the high frequency impedance of the shield system.

Further, since the shield outer cover 1b is attached to the shield outer cover collar portion 13 of the conductive inner case 15 over the entire circumference, the contact area with the conductive inner case 15 can be increased. Therefore, the high frequency impedance can be reduced more effectively.

Furthermore, a portion 1 of the collar for clamping the shield outer covering of the outer case 18 is provided.
Due to the suppressing action of 6, the contact between the shield outer sheath 1b and the conductive inner case 15 can be improved, and the exposure of the shield outer sheath 1b from the conductive inner case 15 can be prevented by the shield outer sheath clamping. It can be hidden by the empty part 16.

Due to this reduction in high frequency impedance, even if the signal cable 1 is subject to common mode noise as described above, the shield jacket 1b of the signal cable 1 is connected to the metal housing with low impedance, and the shield jacket 1b and metal A large potential difference does not occur between the cases, and the influence of noise on signal lines can be eliminated.

As described above, the cable connector of this invention has a terminal mounting member to which a plurality of signal line connection terminals are fixed, and a cable insertion hole surrounded by a portion of the shield jacket collar on the bottom part. a bottomed cylindrical conductive case that covers the terminal mounting member; and a shield that presses the shield jacket of a signal cable inserted into the cable insertion hole of the conductive case against a part of the surface of the shield jacket cap collar. Since it is equipped with a jacket suppressing member, it has the effect of reducing the high frequency impedance of the shield system, improving the shielding effect of the signal cable, and increasing the noise resistance of the signal cable.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional connector device in a separated state;
Fig. 2 is a partial perspective view showing the state of connection with the signal cable, Fig. 3 is a partial perspective view, Fig. 4 is an exploded perspective view showing an embodiment of this invention, and Fig. 5 is a vertical sectional view thereof. It is. 11...Signal line connection terminal, lla...
Connection terminal part, 11b...Contact spring part, 12...
...Terminal mounting member, 13... Part of collar for shield outer cover, 14 ... Cable insertion hole, 1
5...Conductive inner case, 16...Part of the collar for clamping the shield outer covering, 17...Part of the collar insertion hole, 18...Outer case (Shield envelope pressing member).

Claims (2)

[Scope of utility model registration request] (1) A bottomed cylindrical shape that has a terminal mounting member to which a plurality of signal line connection terminals are fixed, and a cable insertion hole surrounded by a portion of the shield outer cover collar on the bottom surface to cover the terminal mounting member. and a shield jacket pressing member that presses the shield jacket of a signal cable inserted into the cable insertion hole of the conductive case against a part of the surface of the shield jacket crown collar. connector. (2) The shield outer cover suppressing member has a bottom surface of a hole for inserting a part of the collar around which a part of the collar for clamping the shield outer cover is provided for sandwiching the shield outer cover with a part of the collar for the crown of the shield outer cover. The cable connector according to claim (1), which is a bottomed cylindrical outer case that can be fitted externally to the conductive case.