JP7227607B2 - Shell structure of connector for differential signal transmission cable - Google Patents

Description

The present invention relates to a shell structure of a connector for differential signal transmission cables, and more particularly to a shell structure of a connector for transmitting high-frequency differential signals.

7A and 7B are diagrams showing an example of a shell structure 700 of a conventional differential signal transmission cable connector, FIG. 7A being a plan view of a conventional shell structure 700, and FIG. FIG. 4 is a cross-sectional view of the shell structure 700 of (A) taken along line BB. As shown in FIGS. 7A and 7B, a conventional shell structure 700 includes a shell body portion 710, a connector inner housing 720, and a differential signal transmission cable 730. FIG.

The shell main body portion 710 is a metal cylindrical member having a predetermined length, and is composed of an inner housing accommodating portion 711 and a cable accommodating portion 712 . A connector inner housing 720 is arranged inside the inner housing accommodating portion 711 . The differential signal transmission cable 730 has at least one pair of internal wires 731 , and the internal wires 731 are surrounded by a copper foil 732 . A braided wire 733 surrounds the copper foil 732 . Furthermore, the braided wire 733 is covered with a metal ferrule 734 , and the braided wire 733 is folded around the ferrule 734 . In this state, the differential signal transmission cable 730 is inserted into the cable accommodating portion 712 of the shell body portion 710 and the internal electric wire 731 is introduced into the connector inner housing 720 .

At this time, a hollow portion 740 is formed between an intermediate portion between the inner housing accommodating portion 711 and the cable accommodating portion 712 of the shell body portion 710 and the connector inner housing 720 , the internal electric wire 731 , the braided wire 733 and the ferrule 734 . Due to the existence of this cavity 740 , there arises a problem that the characteristic impedance and the return loss are lowered when a high-frequency signal is passed through the differential signal transmission cable 730 .

Conventionally, for the purpose of eliminating the cavity 740 or reducing the adverse effects caused by the cavity 740, a conductor or an insulator is inserted outside the internal wires 731 to increase the distance between the internal wires 731 or the internal wires. Adjustments have been made to the distance between 731 and the outer conductor (ie, shell body 710 and braided wire 733).

For example, in Patent Document 1 below, at least a pair of wires for differential signal transmission are spaced apart by a greater distance between the wires in the widened section than in the armored cable section. A plug connector construction is disclosed in which a sleeve is provided to apply pressure to contract the .

Japanese Patent Publication No. 2018-508946

However, in the plug connector structure disclosed in Patent Document 1, it is necessary to insert an additional component outside the internal wires in order to correct or adjust the distance of the internal wires. .

Accordingly, the present invention provides a connector for a differential signal transmission cable that can close the cavities that may occur between the inner housing, the inner electric wire, and the outer conductor of the connector without using any special additional parts. Another object of the present invention is to provide a shell structure of a connector for a dynamic signal transmission cable.

The present invention is a shell comprising a metal cylindrical main body portion having a predetermined length and a crimped portion having a V-shaped notch formed at one end of the cylindrical main body portion. In the structure, when the differential signal transmission cable is inserted into the shell structure, crimping is performed with the braided wire of the differential signal transmission cable interposed radially inside the crimped portion. In the shell structure of the differential signal transmission cable connector, the crimped portion is deformed from a cylindrical shape before crimping to a truncated cone shape, and the crimped portion is in close contact with the braided wire inserted inside the crimped portion. be.

Further, according to one aspect of the present invention, when the differential signal transmission cable is inserted into the shell structure, the crimping portion is crimped with a ferrule further interposed radially inside the braided wire. is performed.

Further, according to one aspect of the present invention, a crimping barrel for crimping the differential signal transmission cable is connected to the crimped portion at a position different from the portion where the notch is formed. .

Moreover, one aspect of the present invention is characterized in that the main body is formed of a flat metal plate, and the joint of the main body and the notch are continuous.

The present invention also provides a differential signal transmission cable connector having the shell structure according to any one of the aspects described above.

According to the shell structure of the connector for differential signal transmission cables of the present invention, when the shell structure is used for the connector for differential signal transmission cables, the inner housing, the inner wires, and the outer conductors of the connector are separated from each other. It is possible to close the cavities that may occur in the body without using special additional parts. In addition, since the braided wire of the differential signal transmission cable is interposed in the cavity that can be generated radially inside the crimped portion of the shell, it is possible to stabilize the high-frequency performance of the crimped portion.

According to one aspect of the above invention, the inner wire of the differential signal transmission cable is mechanically protected from mechanical pressure during caulking and temperature changes during use of the shell structure, and the outer conductor, that is, the braided wire and the main body of the shell structure can be stabilized.

According to the aspect of the present invention, the differential signal transmission cable can be easily inserted into the main body of the shell structure and firmly connected to the shell structure.

According to one aspect of the present invention, manufacturing of the shell structure is facilitated, and manufacturing costs can be reduced.

According to the invention of the connector for the differential signal transmission cable, it is possible to close the cavities that may occur between the inner housing, the inner electric wire, and the outer conductor of the connector without using any special additional parts.

2 is an external perspective view of a shell 110 included in the shell structure of the differential signal transmission cable connector of this embodiment. FIG. 2 is an exploded external perspective view of the shell structure 100 of the present embodiment including the shell 110 of FIG. 1. FIG. It is a figure which shows the assembly process of the shell structure 100 of this embodiment, FIG. 3(A) shows the state in which the cable jacket 340 is partially peeled off from the actuation signal transmission cable 300, and FIG. FIG. 3(C) shows a state in which the wire 330 is folded over the cable jacket 340, and FIG. 3(D) shows a state in which the inner wire 310 is stripped. (E) shows the state where the ferrule 500 is attached, FIG. 3F shows the state where the contact 400 and the internal wire 310 are inserted into the inner housing 200, and FIG. It is a figure which shows. FIG. 4(A) is a perspective view of the differential signal transmission cable 300 inserted into the shell 110 before crimping, and FIG. 4(B) is an assembly of the shell structure 100 of FIG. 4(A). 4(C) is a side view of the assembly of the shell structure 100 of FIG. 4(A), and FIG. 4(D) is a sectional view taken along line DD of FIG. 4(B). FIG. 5A is a perspective view after inserting the differential signal transmission cable 300 into the shell 110 and performing crimping processing, and FIG. 5B is a crimping processing of FIG. 5A. 5(C) is a side view of the assembly of the shell structure 100 after the crimping process of FIG. 5(A), and FIG. 5(D) is a top view of the assembly of the shell structure 100 after FIG. is a cross-sectional view taken along the line DD. The performance of the case of using the connector employing the shell structure 100 of the connector for differential signal transmission cable of the present embodiment and the case of employing the conventional shell structure of the connector for the differential signal transmission cable are compared. FIG. 6A shows changes in characteristic impedance, and FIG. 6B shows changes in return loss. 7(A) is a plan view, and FIG. 7(B) is a cut along line BB of FIG. 7(A). It is a sectional view.

Hereinafter, the shell structure of the differential signal transmission cable connector according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a shell 110 included in the shell structure of the differential signal transmission cable connector of this embodiment. In the following description, the direction in which the shell 110 extends is called the length direction, and the direction orthogonal to the length direction is called the radial direction. In FIG. 1, the side where the shell 110 is attached to the connector for the differential signal transmission cable, that is, the left side of the paper is called the front in the longitudinal direction, and the side to which the differential signal transmission cable is connected, that is, the right side of the paper. shall be referred to as longitudinal rearward.

As shown in FIG. 1, the shell 110 includes a tubular main body portion 120, a crimped portion 130 formed on the rear side in the longitudinal direction of the main body portion 120, and a crimped portion further formed on the rear side in the longitudinal direction of the crimped portion 130. It is composed of a barrel portion 140 . The body portion 120 is a hollow member having a predetermined length in the longitudinal direction and a predetermined thickness in the radial direction. A portion 121 is provided to accommodate an inner housing of a differential signal transmission cable connector (not shown). As will be described later, the inner housing is inserted from the crimped portion 130 side. The body portion 120 is formed by rolling a flat metal plate into a cylindrical shape and joining the two ends of the flat metal plate together at a seam 123 substantially parallel to the length direction.

The crimped portion 130 is formed at one end of the body portion 120 on the rear side in the longitudinal direction, and constitutes a cable housing opening 132 . The crimped portion 130 has a notch 131 . The notch 131 is continuous with the seam 123 of the main body 120 described above, and has a shape in which two opposing sides 133 are opened in a V shape with the point of connection with the seam 123 being the vertex. When the crimped portion 130 is crimped by a crimping process, which will be described later, these two opposing sides 133 are in a parallel positional relationship and joined together.

The crimped barrel portion 140 extends longitudinally rearward from a position of the crimped portion 130 different from the portion where the notch 131 is formed, for example, a position radially facing the notch 131 . A narrow first connection portion 141 (see FIG. 4D) extending from the rear end in the longitudinal direction of the crimped portion 130, a braided barrel 142 connected to the first connection portion 141, a coating It is composed of a barrel 143 and a narrow second connecting portion 144 (see FIG. 4(D)) that connects the braided barrel 142 and the covered barrel 143 .

The first connecting portion 141 extends longitudinally rearward from a portion of the crimped portion 130 on the rear side in the longitudinal direction, which is radially opposed to the portion where the notch 131 is formed. A braided barrel 142 is further connected to the first connecting portion 141 . The braided barrel 142 includes a braided barrel bottom 142A whose longitudinal front side is connected to the first connecting portion 141, a pair of braided gripping pieces 142B extending symmetrically from the braided barrel bottom 142A in the direction orthogonal to the length direction, 142B, and between these braided gripping pieces 142B, 142B, the braided wire portion of the differential signal transmission cable from which the cable jacket is removed can be accommodated. The lengths of the pair of braided gripping pieces 142B, 142B extending in the direction orthogonal to the length direction may be equal to each other as long as the braided wire portion of the actuation signal transmission cable can be gripped. and may be of different lengths.

A second connection portion 144 extends longitudinally rearward from the braided barrel bottom portion 142A of the braided barrel 142, and the covering barrel 143 is connected to the longitudinally rearward side of the second connection portion 144. . The covering barrel 143 includes a covering barrel bottom portion 143A whose longitudinal front side is connected to the second connection portion 144; 143B, and between these coated gripping pieces 143B, 143B, a portion of the differential signal transmission cable from which the cable jacket is not removed can be accommodated. The length of the pair of covering gripping pieces 143B, 143B extending in the direction orthogonal to the length direction is such that they can grip the cable sheath of the actuation signal transmission cable, like the braid gripping pieces 142B, 142B described above. If possible, the lengths may be equal to each other, or they may be different lengths.

FIG. 2 is an exploded external perspective view of the shell structure 100 of this embodiment including the shell 110 of FIG. As shown in FIG. 2 , shell structure 100 includes inner housing 200 , differential signal transmission cable 300 , contacts 400 and ferrule 500 in addition to shell 110 described above.

The inner housing 200 is a cylindrical insulator having a predetermined length in the length direction and a size in the radial direction, which can be inserted into the body portion 120 of the shell 110. Four passages 210 are formed in parallel with the length direction. It is. Each passage 210 is composed of an internal wire housing passage 211 and a contact housing passage 212. Each passage 210 communicates with the outside in the radial direction, and the contact and the internal wire connected thereto, which will be described later, are diametrically connected. It can be inserted into the channel 210 from the lateral side or from the longitudinal rear side. It should be noted that the passage 210 does not have to communicate with the outside in the radial direction. be. The number of passages 210 may be two or eight depending on the number of internal wires of differential signal transmission cable 300 connected to shell structure 100 .

The differential signal transmission cable 300 includes two pairs of internal electric wires 310, four in total, in this embodiment. The internal wires 310 are twisted together inside the cable, and the entire periphery of the internal wires 310 is surrounded by a copper foil 320 (see FIG. 3B) to protect the twisted internal wires 310 from unraveling. there is A metal braided wire 330 surrounds the copper foil 320 and constitutes an outer conductor for the inner wire 310 . A resin cable jacket 340 surrounds the metal braided wire 330 .

Furthermore, as shown in FIG. 2, a contact 400 is connected to the conductor of each internal wire 310 . Contact 400 is a female contact that receives a male contact of a mating connector in this embodiment, but may be a male contact. These internal wires 310 and contacts 400 are housed in the internal wire housing passage 211 and the contact housing passage 212 of the inner housing 200 described above, respectively.

The ferrule 500 is a hollow cylindrical member made of metal having a predetermined length in the longitudinal direction. In this embodiment, the ferrule 500 is fitted around the copper foil 320 of the differential signal transmission cable 300 and radially inside the braided wire 330 . This assembly process will be described later. When the differential signal transmission cable 300 is inserted into the shell 110 and the crimped portion 130 is crimped, the ferrule 500 mechanically protects the internal electric wire 310 located radially inside the ferrule 500, and also protects the braided wire. Improves physical contact between 330 and shell 110 to improve electrical continuity.

Next, the assembly process of the shell structure 100 of this embodiment will be described with reference to FIGS. 3 to 5. FIG. As shown in FIG. 3A, the cable jacket 340 of the differential signal transmission cable 300 is cut at a predetermined length from the cable end, and the cable jacket 340 is peeled off. FIG. 3A shows a state in which only the cable jacket 340 is being peeled off from the differential signal transmission cable 300 and the internal braided wire 330 is visible.

Next, as shown in FIG. 3B, the exposed braided wire 330 is folded back on the outside of the cable jacket 340 in the lengthwise rearward direction. Then, the copper foil 320 radially inside the braided wire 330 is exposed. The copper foil 320 is cut at a predetermined length from the end of the cable so that the internal wire 310 is exposed.

Next, as shown in FIG. 3(C), the covering of the internal wire 310 is removed from the end of the cable by a predetermined length to expose the conductor 311 . Further, as shown in FIG. 3D, the contact 400 is crimped to the exposed conductor 311 . Although detailed description is omitted here, the contact 400 includes a connecting portion consisting of a female contact portion for receiving the male contact of the mating connector and a gripping piece for crimping connection of the conductor 311. The conductor 311 is inserted into and crimped by crimping the grip piece.

Next, as shown in FIG. 3(E), a ferrule 500 is attached around the copper foil 320 . Further, as shown in FIG. 3F, the contacts 400 and the internal wires 310 connected to the contacts 400 are inserted into the inner housing 200 . Specifically, the contacts 400 are inserted into the contact housing passages 212 of the inner housing 200 , and the internal wires 310 are inserted into the internal wire housing passages 211 of the inner housing 200 .

Next, as shown in FIG. 3G, the braided wire 330 that has been folded back on the cable jacket 340 in the longitudinal direction is again folded forward in the longitudinal direction so as to cover the periphery of the ferrule 500 . As a result, the tip portion of the braided wire 330 reaches the lengthwise rear end portion of the inner housing 200 .

Next, the assembly of the differential signal transmission cable 300, the inner housing 200, and the ferrule 500 assembled in the above steps is inserted into the shell 110 from the longitudinal rear to the front. Note that FIG. 4A is a perspective view of the shell structure 100 in which the differential signal transmission cable 300 is inserted into the shell 110 before caulking, and FIG. 4B is a perspective view of FIG. 4(C) is a side view of the assembly of the shell structure 100 of FIG. 4(A), and FIG. 4(D) is a cross section along the line DD of FIG. 4(B). It is a diagram.

At this time, the sheathed barrel 143 of the shell 110, the braided barrel 142, and the crimped portion 130 provided with the notch 131 are in an open state before the crimping process. Braided wire 330 of transmission cable 300 and inner housing 200 can be easily inserted into shell 110 . By this insertion process, the inner housing 200 connected to the differential signal transmission cable 300 is positioned inside the inner housing accommodating portion 121 of the shell 110 . Also, the cable jacket 340 of the differential signal transmission cable 300 is positioned between the pair of sheath gripping pieces 143B, 143B of the sheath barrel 143 of the shell 110, and the braided wire 330 is positioned between the pair of braids of the braided barrel 142 of the shell 110. It is located between the gripping pieces 142B, 142B.

As can be seen from FIG. 4D, the braided wire 330 is interposed between the crimped portion 130 of the shell 110, the inner housing 200, the internal wire 310, and the ferrule 500, and fills this portion. there is

Next, as shown in FIG. 5, the crimped portion 130 of the shell 110, the braided barrel 142, and the covered barrel 143 are crimped with a crimping tool. 5A is a perspective view after inserting the differential signal transmission cable 300 into the shell 110 and performing caulking processing, and FIG. 5B is a perspective view of FIG. 5A. FIG. 5(C) is a side view of the assembly of the shell structure 100 after the crimping process, FIG. 5(D) is a side view of the shell structure 100 assembly after the crimping process. B) is a cross-sectional view taken along line DD.

At this time, the crimped portion 130 of the shell 110 and the braided barrel 142 are simultaneously crimped in the same process. As a result, the two opposite sides 133 of the notch 131 of the crimped portion 130, which were open in a V shape before the crimping process, come into contact with each other and closed after the crimping process. In addition, since the crimping process is performed so that the opposing sides 133 that are open in a V-shape are in contact with each other, the crimping part 130 is deformed from a cylindrical shape before the crimping process to a truncated cone shape (FIG. 4D). Compare FIG. 5(D)). In addition, in this embodiment, the case where the opposing sides 133 are in contact with each other in parallel is described, but they may be crimped so as to overlap each other vertically. Further, the braided barrel 142 is reduced in diameter such that the two braided gripping pieces 142B partially overlap each other, thereby firmly gripping the braided wire 330 therein. Similarly, the diameter of the covering barrel 143 is reduced so that the two covering gripping pieces 143B partially overlap each other, and the cable jacket 340 inserted therein is firmly gripped.

Due to this crimping process, the crimped portion 130 of the shell 110 is contracted into a truncated cone shape and adheres closely to the braided wire 330 inserted inside, so that the crimped portion 130 of the shell 110, the inner housing 200, the internal electric wire 310, and the ferrule are assembled together. The space between 500 is occupied by the braided wire 330, leaving almost no space.

As a result, the distance between the inner wire 310 and the outer conductor such as the shell 110 or the braided wire 330 and the electrical characteristics therebetween can be kept constant without using additional parts.

FIG. 6 compares the performance when a connector employing the shell 110 of the connector for differential signal transmission cable of the present embodiment is used and the shell structure of a conventional connector for differential signal transmission cable is employed. FIG. 6A shows changes in characteristic impedance, and FIG. 6B shows changes in return loss.

As shown in FIG. 6A, when the characteristic impedance of a connector for a differential signal transmission cable that employs the shell structure 100 of this embodiment is designed to be 100Ω, the connector that employs the shell 110 of this embodiment is better. The specific impedance is improved over connectors that employ conventional shell construction. Further, as shown in FIG. 6B, the return loss of the connector employing the shell structure 100 of the present embodiment is improved at high frequencies of 1 GHz or more, for example, compared to the conventional connector.

REFERENCE SIGNS LIST 100 shell structure 110 shell 120 main body 121 inner housing accommodating portion 123 seam 130 crimped portion 132 cable accommodating opening 133 opposite side 140 crimping barrel portion 141 connecting portion 142 braided barrel 142A braided barrel bottom 142B braided grip piece 143 covered barrel 143A covered barrel bottom 143B coated gripping piece 144 connecting portion 200 inner housing 210 passage 211 internal wire housing passage 212 contact housing passage 300 differential signal transmission cable 310 internal wire 311 conductor 320 copper foil 330 braided wire 340 cable jacket 400 contact 500 ferrule

Claims (5)

a metallic and cylindrical main body having a predetermined length;
a crimping portion having a notch formed in a V-shaped opening at one end of the cylindrical main body;
A shell structure with
When a differential signal transmission cable is inserted into the shell structure, if crimping is performed with the braided wire of the differential signal transmission cable interposed radially inside the crimped portion, the crimped portion is deformed from a cylindrical shape before crimping to a truncated conical shape, and the crimped portion is in close contact with the braided wire inserted therein. 2. When said differential signal transmission cable is inserted into said shell structure, said crimping portion is crimped with a ferrule interposed radially inside said braided wire . Described shell structure. 2. The shell structure according to claim 1, wherein a crimping barrel for crimping said differential signal transmission cable is connected to said crimped portion at a position different from the portion where said notch is formed. 4. The shell structure according to any one of claims 1 to 3 , wherein said main body is formed of a flat metal plate, and said joint of said main body and said notch are continuous. A differential signal transmission cable connector having the shell structure according to any one of claims 1 to 4 .

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