JPH0414858Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) The present invention relates to a coaxial cable connector, and particularly to a coaxial cable connector for data transmission of a supercomputer. (Prior Art) Computer cables have a central signal conductor, an inner insulator around it, and a mesh-like, metal foil or metal wire grounding outer conductor and outer sheathing concentrically. . Cables for data transmission of computers, particularly supercomputers, must transmit a large amount of data in a short period of time, and the pulse rate is also high. Regarding the electrical characteristics of cables for such applications, the smaller the propagation delay, the better, and the smaller the crosstalk, the better. Here, crosstalk refers to a phenomenon in which a signal voltage carried by one cable generates a voltage in an adjacent cable due to electromagnetic induction. Such crosstalk is usually prevented by a mesh, metal foil or metal wire outer conductor. However, inside an electrical connector for connecting cables, each cable is connected without its outer sheath and outer conductor.
Crosstalk occurs within electrical connectors. Japanese Utility Model Publication No. 58-11022 discloses an electrical connector for connecting a coaxial ribbon cable. This electrical connector enables high-density mounting and allows for any desired ground pattern to be easily adopted.The electrical connector has a configuration in which a ground contact is disposed in the same way as a signal contact in the housing of the electrical connector. have (Problems to be Solved by the Invention) In the configuration disclosed in the above publication, the ground contacts protruding from the housing are connected to each other while in contact with the outer conductor at the end of the cable wrapped around the cover of the electrical connector. It is now possible to use close soldering. In this configuration, the end of the cable wrapped around the cover of the electrical connector has the outer conductor and outer sheath removed from the end of the cable wrapped around the cover beyond the point of contact with the ground contact protruding from the housing. Therefore, crosstalk cannot be prevented at the end of the cable from which the outer conductor is removed. Furthermore, since the ground contact and the signal contact, which have different shapes, are mounted on the housing, it is difficult to mechanize the mounting work. (Means for Solving the Problems) An object of the present invention is to provide a coaxial cable connector that significantly reduces crosstalk. According to the present invention, the ground includes a wire holder for arranging a coaxial cable to be connected on the outer periphery, a housing on which a plurality of contacts are mounted, and a grounding member coupled to the outer conductor of the coaxial cable. The coaxial cable and grounding member is made of a conductive material and is attached to the wire holder, and further includes a plurality of parallel conductive pieces, and the coaxial cable and grounding member are attached to the wire holder. When mounted, the conductive piece is adapted to extend along the coaxial cable, and when the wire holder is assembled to the housing, the conductive piece contacts a corresponding contact mounted on the housing. An electrical connector for a coaxial cable is provided, the electrical connector being adapted for mating. DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, an electrical connector 10 for coaxial cables according to the present invention is shown partially disassembled (strain relief not shown for clarity), and the electrical connector 10 is shown partially disassembled (strain relief not shown for clarity). teeth,
A housing 1 made of an insulating material is equipped with a plurality of contacts 4 of the same shape, a wire holder 2 is equipped with a grounding member 3 formed integrally with a plurality of parallel conductive pieces, and a strain relief 6. including. After attaching the grounding member 3 to the wire holder 2 as shown in FIGS. 5B and 6,
The ends of the ribbon-like coaxial cable 5 (see FIG. 2) are aligned and attached. The electrical connector 10 according to the present invention may be used to connect separate, loose coaxial cables as well as ribbon coaxial cables. Referring to Figure 2,
A single cable in the ribbon-like coaxial cable 5 includes a central signal conductor 5a and a low dielectric constant insulating layer 5.
b, a conductive shield 5c that shields the signal conductor;
and an outer insulating layer 5d. Referring to FIG. 3, the plurality of contacts 4 attached to the housing 1 have connection ends 4a that are adapted to contact a header post (not shown) inserted through the square hole 1a of the housing 1; Other conductors (e.g.
It has a U-shaped groove forming portion 4b connected to the insulated conductor. The housing 1 is integrally formed with a latch portion 1b for holding other connector parts. Referring to FIG. 4, the gland member 3 is stamped from a sheet metal material and then bent into the configuration shown. The ground member 3 includes a solder post 3a soldered to the conductive shield 5c of the coaxial cable 5, an elongated conductive piece 3b, and a conductive piece 3d shorter than the conductive piece. A necessary number of grounding contacts are provided, each having a concave pressurized part 3c which is adapted to contact and engage with the U-shaped groove forming part 4b of the contactor 4. In assembling the electrical connector configured as described above, the bent grounding member 3 is attached to the wire holder 2, and then the conductive shield 5c and the outer insulating layer 5d are stripped at the ends of the plurality of wires. A coaxial cable 5 passes through the strain relief 6 and is then attached to the wire holder 2 and soldered at 7 to the solder post 3a.
In this way, the coaxial cable 5 attached to the strain relief 6 and the wire holder 2 is connected to the housing 1 as shown in FIGS. 5B and 6.
is contact-coupled to a contact mounted on the A contactor 4 corresponding to the elongated conductive piece 3b of the grounding member 3
is connected in contact with the pressurized portion 3c of the elongated conductive piece 3b. On the other hand, the short conductive piece 3d of the grounding member 3
As shown in FIG. 5B, the corresponding contactor 4 is connected in contact with only the signal conductor 5a (see FIG. 2) of the corresponding coaxial cable 5 to establish electrical conduction therewith. In this way, the part of the coaxial cable 5 wrapped around the wire holder 2 from which the conductive shield 5c has been stripped,
Since the short conductive piece 3b extends along, the crosstalk phenomenon is effectively prevented. Referring to Figure 5A, the above-mentioned Utility Model Publication No. 58-11022
The connection state of the electrical connector described in the publication is shown, and the ground contact 8 attached to the housing 1' stands upright from the housing and connects the wire.
It penetrates through the holder 2' and is directly soldered to the conductive shield 5c of the coaxial cable 5. Therefore, the coaxial cable 5 from which the conductive shield 5c has been stripped
cannot avoid the crosstalk phenomenon. In order to confirm the effectiveness of the present invention, an experiment was conducted regarding crosstalk characteristics, and the present invention was compared with the conventional technology. The experiment was conducted as follows. As measurement objects, a connector according to an embodiment of the present invention shown in FIG. 5B and a connector according to the prior art shown in FIG. 5A were attached to both ends of separate coaxial lines, respectively, as shown in FIG. The measurement conditions were a pulse voltage of 2.6V,
Apply a drive line input pulse with a pulse speed of 200 ns (5.0 MHZ), a pulse width of 100 ns, and a pulse rise time of 1.1 ns to the drive line of the measurement circuit shown in Figure 8, and observe the voltage generated in the induced line. did. The results obtained are shown in Table 1. As shown in this table, the device according to the present invention has both near-end crosstalk voltage and far-end crosstalk voltage smaller than that of the prior art device, indicating improved characteristics.

[Table] (Effects of the invention) According to the invention, contacts of the same shape are attached to the housing of the electrical connector, making it possible to mechanize the attachment work and effectively preventing crosstalk within the electrical connector. be done. Therefore, the functionality of the electrical connector can be improved and manufacturing costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view of an electrical connector according to the present invention, FIG. 2 is a perspective view of a ribbon-shaped coaxial cable,
Figure 3 is a sectional view of the housing of the electrical connector in Figure 1, Figure 4 is a perspective view of the gland member, and Figure 5A.
5B is a schematic diagram showing the connection relationship in an electrical connector according to the present invention; FIG. 6 is a schematic sectional view of the electrical connector according to the present invention; FIG. 7 is a schematic diagram showing the connection relationship in an electrical connector according to the present invention; Fifth
A diagram showing a state in which a connector according to an embodiment of the present invention shown in Figure B or a connector according to the prior art shown in Figure 5A is attached to both ends of a coaxial line, and Figure 8 shows a circuit for measuring crosstalk characteristics. 9 and 9 are diagrams showing the waveforms of the near-end crosstalk voltage and the far-end crosstalk voltage with respect to the waveform of the input pulse on the drive line side in the measurement circuit of FIG. 8. In the figure, 1...Housing, 2...Wire holder, 3...Glanding member, 3a...Solder post, 3b...Elongated conductive piece, 3d...
Short conductive piece, 4... Contact, 5... Coaxial cable, 6... Strain relief, 10... Electric connector for coaxial cable.

Claims (1)

[Scope of utility model registration request] An electrical connector for a coaxial cable, which includes a wire holder around which a coaxial cable to be connected is disposed, and a housing fitted with a plurality of contacts, which is further coupled to the outer conductor of the coaxial cable, and which is electrically conductive. a grounding member made of a material, the grounding member integrally forming a plurality of parallel conductive pieces, and when the grounding member and the coaxial cable are attached to the wire holder; , the conductive piece is configured to extend along the coaxial cable, and when the wire holder is assembled to the housing, the conductive piece is configured to contact and couple with a corresponding contact mounted on the housing. An electrical connector for coaxial cables, which is characterized by its shape.