JPH087937A - Modular plug for LAN - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a modular plug for LAN, which can reduce the untwisted range of the wire of the LAN cable as much as possible. [Structure] A guide hole 8 for guiding a holding frame 7 to a predetermined position and a mounting hole 9 for a blade 6 are formed in a casing 5,
The holding frame 7 is formed with a positioning 12 for holding the core wire 1 at a predetermined position while covering the wire 2 of the LAN cable 3, and a slit 13 for inserting the blade 6, and the blade fitted in the mounting hole 9 is wired. 2 is press-fitted to connect the core wire 1 and the blade 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modular plug for a LAN, and more specifically, it can be connected without twisting a so-called twisted cable in which two twisted core wires are formed by twisting two twisted core wires. It concerns a modular plug.

[0002]

2. Description of the Related Art A modular plug is used to connect a cable used for signal transmission such as a telephone or a LAN (Local Area Network) to a device body. It is well known that this modular plug is a member as small as the tip of an adult little finger, and a plate-shaped blade serving as a terminal is pressed against the core wire in the cable insertion hole to connect the terminal and the core wire. .

By the way, as a means for efficiently carrying out the work of aligning the plurality of thin core wires and inserting them into a small modular plug, for example, Japanese Utility Model Laid-Open No. 63-162460 discloses.
A means for attaching the aligner to the core wire while avoiding the tip end portion where the terminal blade is pressed against the core wire, inserting the aligner into a modular plug, and pressing the terminal blade against the tip end portion of the core wire is disclosed. .

By the way, when an alternating magnetic field acts on an electric wire, a current flows due to electromagnetic induction, which causes noise. Therefore, in a cable for LAN or the like, two core wires are twisted together to eliminate the generated noise. This has been done conventionally. For example, the structure of a LAN cable will be described using a twisted pair LAN cable. Cores 2a, 2b, 2c, 2d (hereinafter, the cores are generically referred to as conductors 1 in which a plurality of copper wires are twisted together are covered with an insulator. 2) is formed, the core wire 2a and the core wire 2b, and the core wire 2c and the core wire 2d are twisted together, and the outer surface thereof is covered with a sheath made of an insulator to form the cable 3. Is forming. Although the conductor 1 is shown in FIG. 9 as a stranded wire, a thin copper wire may be wound around a yarn such as nylon to make it more flexible, or a single wire may be used for flexibility. Something that has been lowered is also used.

When connecting the LAN cable to the modular plug, it is necessary to dispose the ends of the core wires in parallel with each other. Therefore, in the conventional modular plug, it is necessary to untwist the core wire by a length corresponding to the length of the aligning tool in addition to the length of the portion where the blade is pressed.

[0006]

By the way, in the case of a modular plug for LAN, noise generated in a conductor portion of a portion having a length of only about 10 mm near the terminal may be harmful. Therefore, if a modular plug that does not need to be untwisted except for the part connected to the terminal part is provided,
It is possible to suppress noise generation more effectively.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a modular plug for LAN which can shorten the untwisted range of the core wire as much as possible.

[0008]

The structure of the LAN modular plug of the present invention for achieving the above object is LA.
A casing for a plug for connecting the N cable to the LAN device and a holding frame for holding the ends of the cores of the cable, and a slit-shaped mounting hole for inserting a plate blade for the terminal into the casing; A cable mounting hole for guiding the holding frame is formed at a portion where the blade is pressed against the core wire, and a slit hole for inserting the blade is formed in the holding frame at a portion where the holding frame faces the slit-shaped mounting hole. Along with this, a positioning hole for arranging the core wire is formed in the holding frame at a position where the blade is pressed against the conductor.

By making the casing shape, terminal shape and mounting position, locking means, etc. of the modular plug for LAN of the present invention common to the conventional one, it is possible to fit the conventional jack already mounted. You can There is no particular limitation on the shape of the positioning hole formed in the holding frame. Insertion holes are formed for each core wire, a partition wall is provided between the core wires, and one hole is formed as a whole to project on the wall surface. It is possible to adopt various modes such as one in which a line is provided for partitioning. The point is that when the blade is press-fitted, the cable is prevented from being pushed by the blade and being displaced.

[0010]

In the holding frame for positioning and aligning the core wires, a slit hole for inserting the blade is formed, and the blade is pressed into contact with the conductor in the core wire in the holding frame. By reducing the number of parts as much as possible, it is possible to further reduce noise generation in the modular plug part.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the accompanying drawings with reference to the accompanying drawings. LA of the embodiment shown in FIGS.
The modular plug 4 for N is composed of a casing 5 which is a rectangular injection molded body, a blade 6 for a contact made of a metal plate, and a holding frame 7 which is an injection molded body. A cable (not shown) is provided in the casing 5. A cable mounting hole 8 for guiding the held holding frame 7 to a predetermined position and a slit-shaped mounting hole 9 for the blade 6 are provided. The other structure of the casing 5 is the same as that of the conventional LAN modular plug, and the description thereof will be omitted. Further, in the present embodiment, a plug having eight terminals was used, but the number of terminals is not essential to the present invention and can be set to any number.

The contact blade 6 includes a contact portion 10 and a conductor 1.
And a wedge-shaped press-contact portion 11 that is press-fitted into the slit-shaped mounting hole 9. The blade 6 shown in FIGS. 1 to 4 shows a state before assembly, that is, a state where the blade 6 is held at a position where it does not interfere with the conductor 1 (FIG. 3) and the holding frame 7. The holding frame 7 is made of polycarbonate, and has a positioning hole 12 in which each core wire 2 is separated by a partition wall and a blade 6
A slit hole 13 was formed to pass through. Although the positioning hole 12 of the holding frame 7 of the present embodiment is a through hole, it may have a shape in which the tip side is closed like a bag.

Next, the procedure for assembling the LAN modular plug 4 of the embodiment will be described with reference to FIGS. 1 to 4
As shown in, the blade 6 is press-fitted into the slit-shaped mounting hole 9 of the casing 5 so as not to project to the cable mounting hole 8 side. The sheath 3a is removed to expose the tip of the core wire 2, and the tip of the core wire 2 is inserted until it reaches the tip of the positioning hole 12. The holding frame 7 holding the core wire 2 in this way is inserted until it reaches the tip of the cable mounting hole 8 of the casing 5, and the slit-shaped mounting hole 9 formed in the casing 5 is inserted.
And the slit hole 13 formed in the holding frame 7 face each other.
Next, as shown in FIGS. 5 and 6, the blade 6 is press-fitted to a predetermined position, and the tip portion of the blade 6 breaks the coating of the core wire 2 and press-contacts with the conductor 1. The modular plug assembled as described above can be used in exactly the same manner as a conventional LAN modular plug.

In the LAN modular plug to which the cable formed as described above is attached, the blade 6 is brought into pressure contact with the conductor 1 in the core wire 2 in the holding frame 7, so that a portion where the core wire 2 can be untwisted is possible. The noise generated in the plug portion can be reduced as much as possible. The modified example of the holding frame 7 shown in FIG.
Is formed into a round hole shape, and another modification shown in FIG. 8 is to form the positioning holes 12 of the ridge by connecting the individual positioning holes 12 to each other. As described above, the positioning hole 12 can be variously modified and implemented.

[0015]

According to the modular plug for LAN of the present invention described above, the holding frame for aligning and holding the core wires of the LAN cable is formed with the slit hole for inserting the blade pressed into contact with the conductor. Since the blade is pressed into contact with the conductor in the core wire, the untwisting length of the core wire can be shortened as much as possible, and noise generated at the part where the cable is connected to the modular plug is eliminated. It can be reduced as much as possible. Moreover, the design change portion of the conventional modular plug is extremely small, the work for connecting the LAN cable to the modular plug is easy, and it is suitable for mass production, which is advantageous in cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a modular plug for LAN according to an embodiment of the present invention.

FIG. 2 is a bottom view of FIG.

3 is an enlarged cross-sectional view taken along the line III-III of FIG.

FIG. 4 is a perspective view of a holding frame used in FIG.

5 is a partial vertical cross-sectional view showing a state where a cable is assembled to the LAN modular plug shown in FIG.

6 is a partial cross-sectional view taken along the line VI-VI of FIG.

FIG. 7 is a modification of the holding frame shown in FIG.

FIG. 8 is another modification of the holding frame shown in FIG.

FIG. 9 is a partial side view showing a partially broken structure of a twisted pair cable.

[Explanation of symbols]

1 conductor 2 core wire 2a core wire 2b core wire 2C core wire 2d core wire 3 LAN cable 3a sheath 4 LAN modular plug 5 casing 6 blade 7 holding frame 8 cable mounting hole 9 slit mounting hole 10 contact part 11 pressure contact part 12 Positioning hole 13 Slit hole

Claims (1)

[Claims] 1. A slit comprising a casing of a plug for connecting a LAN cable to a LAN device and a holding frame for holding the tip of each core wire of the cable, and a slit for inserting a plate blade for a terminal into the casing. -Shaped mounting hole and a cable mounting hole for guiding the holding frame to the portion where the blade is pressed against the core wire are formed, and the blade is inserted into the holding frame at the portion where the holding frame faces the slit-shaped mounting hole. A modular plug for LAN in which a slit hole is formed and a positioning hole for arranging the core wire is formed in the holding frame at a position where the blade is pressed against the conductor.