JPH09204955A - Interface cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connector for terminal processing structure in which the continuity between a shell and a cable braid can be easily attained without deforming a cable or disturbing characteristic impedance. SOLUTION: This interface cable has a connection part formed by fitting a ferrule B28 onto the sheathing of a cable end part, turning up the braid 34 of a cable 32 onto a part of the ferrule B28, fitting a ferrule A26 onto the turned part of the braid 34 followed by caulking from the outside, arranging the protruding part of a shell provided on the connecting side of the connector on the outside of the part having no turned part of the braid 34 of the cable 32 of the ferrule B28, and fitting a ferrule C30 onto the protruding part of the shell followed by caulking from the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interface cable for connecting electronic devices,
In particular, the present invention relates to a conductive structure between a connector shell attached to the tip of a cable and a cable braid.

[0002]

2. Description of the Related Art Conventional interface cables mainly consist of contacts, blocks, shells A and B, and hoods A and B.
It consists of an interface connector (hereinafter "connector") composed of and and a cable. FIG.
FIG. 8 is a perspective view of a connector in which a cable 32 is connected to a shell A18 and a shell B20 of a conventional interface cable.

A plurality of contacts are held and fixed to the block by press fitting or the like. This contact is made of metal and manufactured by a known press working technique or the like. A cable 32 is connected to the tail portion of this contact. The block 12 is made of resin and manufactured by a known injection molding technique or the like. The conductor of the terminated cable 32 is connected to the connector, and the braid 34 of the cable 32 is folded back onto the jacket of the cable 32. The shell A1 is attached to the block 12 of the connector to which the cable 32 is connected.
8. Cover with shell B20. At this time, the clamp portion 48 of the shell B is positioned at the folded back portion of the cable 32 braid 34. In this state, a jig (not shown) is used to connect the clamp portion 48 of the shell B20 to the cable 3
2 braid 34 By crimping the folded part,
The connector is fixed to the cable 32, and the shell and the braid 34 of the cable 32 are electrically connected. As a method of fixing the shell A18 and the shell B20 to each other, the engagement portion A22 of the shell A18 is replaced with the engagement portion A2 of the shell B20.
It is carried out by crimping and snapping on 4. After fixing the shell, I cover it with a hood.

[0004]

As described above, since the clamp portion of the shell is directly crimped to the cable, the cable is deformed, the characteristic impedance is disturbed, and the transmission loss increases, which is a problem to be solved. . Also, if the caulking strength is weakened so as not to deform the cable,
There was also a problem that the cable could come off when the shell and the cable braid could not be electrically connected or the cable was bent.

It is an object of the present invention to provide an electric connector 10 having a terminal treatment structure which prevents the cable from being deformed and disturbs the characteristic impedance, and ensures reliable conduction between the shell and the cable braid. .

[0006]

[Means for Solving the Problems]
Protrusions A and B are provided on the connection side of B, and three ferrules A
It can be achieved by using B and C as follows.
First, the ferrule B is fitted to the outside of the cable end portion, and the cable braid is folded back to a part of the outside of the ferrule B. Secondly, the ferrule A is arranged so as to be located outside the folded portion of the cable braid and crimped. Thirdly, the projecting portions A and B of the shells A and B are arranged in a portion of the cable braid where there is no folded portion. Fourth, the ferrule C is fitted and crimped on the outside of the protruding portions A and B of the shells A and B arranged on the ferrule B. Also, ferrule A
-It is better to bend one end of the protruding portion located on the cable end side of B inwardly at a substantially right angle.

[0007]

Since the ferrule B is provided, the cable is not deformed even if the ferrule A or the ferrule C is caulked from the outside. By using the three ferrules A26, B28, and C30, it is possible to easily establish reliable conduction between the cable 32 braid 34 and the shell A18 and shell B20. The ferrules A and B and the cable braid can be easily aligned by bending one end of the ferrules A and B located on the cable end side inwardly at a substantially right angle.

[0008]

An embodiment of the present invention will be described below with reference to FIG. FIG. 1 (A) is a perspective view of a connector mounting portion at the tip of the interface cable according to the present invention, and FIG.
[Fig. 3] is a cross-sectional view when (A) is cut at the center. FIG.
[Fig. 2] is a perspective view of each component obtained by disassembling the electrical connector 10 of the connector mounting portion of Fig. 1 for each component. The connector 10 according to the present invention is mainly composed of a contact 14, a block 12, shells A / B 18, 20 and hoods A / B 36, 44.

The size of the electrical connector 10 in this embodiment is 50 mm in length, 15 mm in width, and 10 mm in thickness.
It is a degree. The length, width and thickness vary depending on the contact pitch and the number of cores. In this embodiment, the contact pitch is 2 mm and the number of cores is 6. The core wire 16 of the cable 32 subjected to the terminal treatment is connected to the contact 14 by a conventionally known connection method such as soldering, pressure welding, and pressure bonding. Examples of the material of the contact 14 include brass, phosphor bronze, beryllium copper, etc. However, phosphor bronze is preferable in consideration of spring property and price. Contact 14
Is processed by a known press work or the like. The contact 14 is held / fixed to the block 12 by press fitting or the like. As the material of this block 12,
PBT, PA, LCP, PPS, PET and the like can be mentioned, but PBT is preferable in consideration of moldability and price.
The block 12 is processed by a known injection molding technique or the like. Three ferrules A and B in the present invention
-C is made of a metal material having good conductivity in order to establish continuity with the cable braid and the connector shell. Examples of the metal material include brass and steel, but brass is preferable in view of workability. The three ferrules have a cylindrical shape and are manufactured by a known cutting technique or the like. The shell A18 and the shell B20 are metallic materials having electrical continuity from the standpoint of establishing electrical continuity with the braid 34.
Although brass, phosphor bronze, beryllium copper, etc. are mentioned, brass is preferable in consideration of workability. Shell A18, Shell B
20 is processed by a known press work or the like.

The procedure for assembling the wire connection portion will be described below. In advance, from the terminal side of the cable 32, the ferrule C30
-Fit in the cable 32 in the order of ferrule A26 and ferrule B28. First, after performing the terminal treatment of the cable, the ferrule B28 is placed on the jacket of the cable terminal.
Pull back.

Next, the braid 34 of the cable 32 is folded back on the ferrule B28. At this time, the braid 34 to be folded does not cover the entire ferrule B28, but the ferrule B28 on the side opposite to the cable end is 5-7.
The braid 34 of the cable 32 is cut so that it is exposed by about mm. The exposed portion of the ferrule B28 is contacted with the cut end surface of the braid 34 so that the ferrule A26
Insert and align, and perform hexagonal caulking. By crimping, the braid 34 and the ferrule B28 can be electrically connected. Exposed part of ferrule B28, projecting part A23 of shell A18 and projecting part B2 of shell B20
The shell A18 and the shell B20 are covered so that 5 matches. At this time, the shell A18 and the shell B20 are fixed by caulking the engaging portion A22 and the locking portion A24.

With the shell A18 and the shell B20 fixed to each other, the projection A2 of the shell A18 and the shell B20 is fixed.
3. Cover the protrusion B25 with the ferrule C30 and perform hexagonal caulking. By performing the crimping in this manner, the shell A18, the protruding portion A23 of the shell B20, and the protruding portion B25
Contacts ferrule B28, shell A18, shell B
20 and the ferrule B28 are electrically connected. The braid 34 of the cable 32 is electrically connected to the ferrule B28, and the shells A18 and B20 are electrically connected to the ferrule B28.
8, the shell B20 is electrically connected. Cable 3
Ferrule B between the outer jacket of No. 2 and the folded braid 34
By disposing 28, the cable is not deformed when the ferrule A26 and the ferrule C30 are crimped.

Considering the relationship between the three ferrules as described above, in this embodiment, the ferrule A26 has a size of 8.9 mm in outer diameter, 8.1 mm in inner diameter, 7.5 mm in length, and ferrule B28. The outer diameter is 7.3 mm,
The inner diameter is 6.5 mm, the length is 12 mm, the ferrule C30 has an outer diameter of 9.5 mm, an inner diameter of 8.9 mm,
The length is 7 mm. Therefore, in terms of size, the ferrule C30, the ferrule A26, and the ferrule B28 are arranged in this order. However, since the sizes of the three ferrules change depending on the diameter of the cable 32 used, the cable 32
Design appropriately according to the diameter. The diameter of the cable 32 in this embodiment is 6.1 mm. In this embodiment, the three ferrules have a cylindrical shape, but any shape may be used as long as the above-described role is satisfied. Further, the ferrule A26 and the ferrule B28 are positioned at a right angle to the side of the cable 32 positioned on the braid 34 by about 0.5 mm inward to make them easier to align than the cylindrical shape. It is better to fold it up to 90 degrees.

After the three ferrules of the shell A18 and the shell B20 are fixed, the shell A18 and the shell B20 are fixed.
A hood A44 and a hood B36 which are divided into two are applied on the above.
The hood A44 and the hood B36 are fixed by the engagement portion B46 of the hood A44 engaging with the locking portion B40 of the hood B36. Materials of the hood A44 and the hood B36 include PBT, PA, LCP, PPS, PET,
ABS, etc. are conceivable, but considering formability and price, A
BS is good. The hood A44 and the hood B36 are processed by a known injection molding technique or the like. Although the hood is divided into two in this embodiment, it may be a one-piece hood, or may be integrally formed of PVC (polyvinyl chloride) or the like in consideration of appearance and price.

[0015]

According to the present invention having the above-mentioned structure,
It has the following remarkable effects. By disposing the ferrule B28 between the outer cover of the cable 32 and the folded braid 34, the cable does not deform when the ferrule A26 and the ferrule C30 are crimped. That is, the cable clamp strength is 8K
g is required, but more clamping strength is obtained and the cable is not deformed. -Since the cable is not deformed, the characteristic impedance is not disturbed and the transmission loss is not increased. -Cable 32 braid 34, shell A18, shell B20
It is possible to easily establish conduction between them. The ferrules A and B and the cable braid can be easily aligned by bending one end of the ferrules A and B located on the cable terminal side inwardly at a substantially right angle.

[Brief description of drawings]

FIG. 1A is a perspective view of an electric connector 10 of the present invention. (B) It is sectional drawing at the time of cutting along (A).

FIG. 2 is a perspective view of each component obtained by disassembling the electrical connector 10 of FIG. 1 into each component.

FIG. 3 is a perspective view of shells A and B of a conventional electric connector and a cable connected to the connector.

[Explanation of symbols]

 10 Electrical Connector 12 Block 14 Contact 16 Core Wire 18 Shell A 20 Shell B 22 Engagement Part A 23 Projection Part A 24 Locking Part A 25 Projection Part B 26 Ferrule A 28 Ferrule B 30 Ferrule C 32 Cable 34 Braid 36 Hood B 40 Locking part B 42 Convex part 44 Hood A 46 Engaging part B 48 Clamp part

Claims (2)

[Claims] 1. A contact having a cable core wire connected to a cable end, a block holding and fixing the contact, shells A and B covering the block and the cable end, and a shell A and B. In an interface cable provided with an electric connector consisting of a hood covering B, a ferrule B is fitted on the outer side of the outer jacket of the cable end, and the braid of the cable is folded back on a part of the outer side of the ferrule B. The ferrule A is fitted on the outer side of the folded portion and crimped, and the projecting portion of the shell provided on the connection side of the connector is arranged outside the portion of the cable of the ferrule B where there is no folded portion. An interface cable having a connecting portion, in which a ferrule C is fitted on the outer side of the protruding portion of the above and is crimped from the outer side. 2. The interface cable according to claim 1, wherein one end of each of the ferrules A and B located on the cable terminal side is bent inward at a substantially right angle.