JP3052177B2 - Modular plug for LAN - Google Patents

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 particularly, to a cable formed of a pair of twisted core wires in a pair, that is, a so-called twisted cable that can be connected without untwisting. It relates to a modular plug.

[0002]

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

As a means for efficiently performing 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 method.
Means is disclosed in which an aligner is attached to a core wire, avoiding a tip portion that presses the terminal blade against the core wire, the aligner is inserted into a modular plug, and the terminal blade is pressed against the distal end portion of the core wire. .

When an alternating magnetic field acts on an electric wire, a current flows due to electromagnetic induction and causes noise. Therefore, in a LAN cable or the like, a set of two cores is twisted to eliminate the generated noise. This has been done conventionally. For example, the structure of a LAN cable using a twisted pair type LAN cable will be described. A conductor 1 in which a plurality of copper wires are twisted is covered with an insulator, and cores 2a, 2b, 2c, and 2d (hereinafter, cores are collectively referred to as cores). When the cable 3 is formed, the core wire 2a and the core wire 2b and the core wire 2c and the core wire 2d are twisted, respectively, and the outside thereof is covered with a sheath made of an insulating material to form the cable 3. Has formed. Although FIG. 9 shows a conductor 1 made of a stranded wire, a thin copper wire is wound around a thread such as nylon to make it more flexible, or a single wire is used to increase flexibility. Lowered ones are also used.

When the LAN cable is connected to a modular plug, it is necessary to arrange the ends of the cords so as to be parallel to each other. Therefore, in the conventional modular plug, it was necessary to untwist the core wire by 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 having a length of only about 10 mm close to the terminal may be harmful. Therefore, if a modular plug that does not need to be untwisted besides the part connected to the terminal part is provided,
Noise generation can be suppressed more effectively.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a LAN modular plug capable of shortening the range for untwisting a cord as short as possible.

[0008]

Because was <br/> to achieve the above object, there is provided a resolving means for ## modular plug for LAN of the present invention, the cable
Holds the ends of multiple core wires included in
Holding frame, and a terminal blade mounting hole provided in the holding frame.
Case with a cable mounting hole for guiding
And the terminal brake provided on the casing.
Through the mounting holes and the holding frame,
LAN consisting of multiple terminal blades connected together
Modular plug for use with
Corresponding to the terminal blade mounting holes of the
Straight line communicating with the positioning hole for holding the core wire provided on the holding frame
It is characterized in that a slit hole for insertion of a terminal plate is provided .

The casing, terminal shape, mounting position, locking means, and the like of the LAN modular plug of the present invention are made common to the conventional one, so that they can be fitted to the already-installed conventional jack. Can be. There is no particular limitation on the shape of the positioning hole formed in the holding frame, and the insertion hole is opened for each core wire, the partition wall is provided between the core wires, the whole is formed with one hole, and the projection is formed on the wall surface. Various modes, such as a partition provided with a strip, can be used. In short, when the blade is press-fitted, it is only necessary to prevent the cable from being pushed by the blade and causing positional displacement.

[0010]

The means for forming a slit through which the blade is inserted into the holding frame for positioning and aligning the core wire and pressing the blade against the conductor in the core wire within the holding frame releases the twist of the core wire. The number of portions can be reduced as much as possible, and noise generation at the modular plug portion can be further reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. LA of the embodiment shown in FIGS.
The modular plug 4 for N comprises 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. The casing 5 is provided with a cable (not shown). 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 is omitted. Although the present embodiment uses the plug having eight terminals, the number of terminals is not essential to the present invention, and may be any number.

The contact blade 6 includes a contact portion 10 and a conductor 1.
And a wedge-shaped press-contact portion 11 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.
Is formed in the slit hole 13. Although the positioning hole 12 of the holding frame 7 in this embodiment is a through hole, it may have a shape in which the distal end side is closed in a bag shape.

Next, the procedure for assembling the LAN modular plug 4 of the embodiment will be described with reference to FIGS. Figures 1-4
As shown in (1), the blade 6 is pressed into the slit-shaped mounting hole 9 of the casing 5 so as not to protrude toward the cable mounting hole 8 side. Also, 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 2 in this manner is inserted until it reaches the end 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 are opposed to 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 sheath of the core wire 2 and presses against 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 modular plug for LAN to which the cable formed as described above is attached, the blade 6 is pressed into contact with the conductor 1 in the core 2 in the holding frame 7, so that the portion where the core 2 can be untwisted is provided as much as possible. As a result, the noise generated at the plug portion could be reduced as much as possible. A modification of the holding frame 7 shown in FIG.
Is formed in the shape of a circular hole. In another modified example shown in FIG. 8, a single positioning hole 12 is communicated with each other to form a positioning hole 12 of a ridge. As described above, the positioning hole 12 can be implemented with various modifications.

[0015]

According to the modular plug for LAN of the present invention described above, the holding frame for aligning and holding the core of the LAN cable is formed with a slit hole for inserting a blade pressed into contact with a conductor. As the blade is pressed against the conductor in the core wire, the length to untwist the core wire can be shortened as much as possible, and the noise generated at the point where the cable is connected to the modular plug is reduced. It can be reduced as much as possible. In addition, the design change of the conventional modular plug is extremely small, the work of 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 the drawings]

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

FIG. 2 is a bottom view of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1;

FIG. 4 is a perspective view of a holding frame used in FIG. 1;

FIG. 5 is a partial longitudinal sectional view showing a state where a cable is attached to the LAN modular plug shown in FIG. 1;

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

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

FIG. 8 is another modified example of the holding frame shown in FIG.

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

[Explanation of symbols]

DESCRIPTION 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 Modular plug for LAN 5 Casing 6 Blade 7 Holding frame 8 Cable mounting hole 9 Slit mounting hole 10 Contact part 11 Contact part 12 Positioning hole 13 Slit hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01R 4/24 H01R 9/03 H01R 12/38

Claims (1)

(57) [Claims] 1. A plurality of core wires included in a cable.
A holding frame for holding the tips in a side-by-side state;
A cable that guides you to the site where the blade
A casing having a mounting hole, and a casing provided in the casing.
The terminal blade mounting hole and the holding frame
A plurality of terminals penetrating through and electrically connected to the core wire
Modular plug for LAN consisting of blades
And attaching the terminal blade of the casing to the holding frame.
Corresponding to the hole, and for holding the core wire provided in the holding frame.
For inserting a straight terminal plate communicating with the positioning hole
A modular plug for LAN characterized by having slit holes .