JP2011076811A - Connecting connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To overcome the problem with the coaxial cables of a connecting connector, wherein signal lines of the coaxial cables at the center of a harness are different in ground distance and route from the signal lines of the coaxial cables at the end thereof and a ground inductance is greater at the center, and so current distribution due to a variation of ground potential is generated in the same harness to further increase radiation noises. <P>SOLUTION: The connecting connector includes a plug connector provided at the end of the harness having the coaxial cables bound and core wires two-dimensionally arranged, plug connector signal pins two-dimensionally arranged in a cellular fashion on the face of the plug connector, and plug connector ground pins arranged to be located between the plurality of signal pins. The signal pins and the ground pins are electrically connected to the signal terminals and the ground terminals of a receptacle connector, respectively, and signal pads and ground pads electrically connected to the signal terminals and the ground terminals inside the receptacle connector are electrically connected to the signal wires and the ground wires of a substrate, respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a connector for connecting a high-speed transmission coaxial cable to a substrate.

  With the recent increase in the speed of information equipment, signal transmission between boards and semiconductor elements inside the equipment has also been speeded up. A coaxial cable is often used to electrically connect signal wiring between substrates as a transmission path for high-speed signal transmission. A coaxial cable is superior in signal transmission characteristics compared to a substrate wiring or a twisted cable, and is characterized in that it can transmit high-frequency signals with high quality.

  Generally, a coaxial cable is handled as a harness in which a plurality of coaxial cables are arranged in parallel, and an electrical connection is maintained by connecting a plug connector provided at the end of the coaxial cable to a receptacle connector provided on the substrate side. Many connectors are provided with terminals for connecting to the board in two rows on the upper and lower sides due to mounting restrictions.

  Patent Document 1 (Japanese Patent Publication No. 2008-541409) discloses that “the signal array includes a plurality of conductors, each of the conductors including at least one inner conductive element and outer conductive element. A conductive body having an array and a contact surface, wherein both ends of the conductor terminate within the conductive body and are substantially coplanar for contacting the signal array with a signal bearing element In the disposed state, the outer conductive element is electrically coupled to the conductor, and the inner conductive element is compressible with the conductive body in contact with the contact surface of the conductive body. A compressible connecting element having a plurality of conductive elements embedded in an electrically insulating medium, wherein the compressible connecting element is positioned relative to the contact surface Is possible, The geometry of the inner and outer conductive elements of the conductor of the signal array and the conductive elements of the signal bearing element when compressed between the contact surface and the signal bearing element. A connector assembly is disclosed that is operable to pass signals between the signal array and the signal bearing elements while maintaining a geometric arrangement.

Special table 2008-541409

  A conventional coaxial cable connector is used to electrically connect a harness in which coaxial cables are arranged in a row to a substrate. A plug connector is provided at the end of the harness, and the plug connector generally has a structure in which a signal terminal and a ground terminal are provided above and below the long side on a convex insulator. A receptacle connector is provided on the substrate side, and the receptacle connector has a concave shape combined with the convex shape of the plug connector. Inside the concave shape of the receptacle connector, metal terminals are provided at positions corresponding to the convex signal and ground terminals of the plug connector. When the connectors are combined, the metal terminals of each connector are electrically connected by contact. It becomes the structure to connect.

  FIG. 11 shows a footprint of a general receptacle connector. A connector 1103 is located in the center, and signal pads 1101 are arranged above and below the long side of the connector. Two ground pads 1102 are provided on the short side of the connector. Since the conductor for ground connection in the connector 1103 is often arranged on the outer periphery of the connector 1103 avoiding signal wiring, the ground pad 1102 is arranged only on the short side which is the end of the connector 1103. In this case, since the distance between the signal wiring and the ground wiring is increased, the electrical coupling is weakened, and the ground inductance is increased. When the ground inductance increases, the current due to the ground voltage change increases. This current also flows through the outer conductor of the coaxial cable that is electrically connected to the connector ground, and the current flows through the outer conductor of the coaxial cable, generating a magnetic field around the cable and affecting other equipment and devices. It becomes the noise that affects.

  Further, the distance and route of the ground are different between the signal line of the coaxial cable at the center of the harness and the signal line of the coaxial cable at the end, and the ground inductance is increased at the center. For this reason, even within the same harness, a current distribution is generated due to fluctuations in the ground potential, which further increases radiation noise.

The following is a brief description of an outline of typical inventions disclosed in the present application.
(1) A plug connector provided at an end portion of a harness in which coaxial cables are bundled and a core wire is two-dimensionally arranged, and a signal of the plug connector that is two-dimensionally arranged on a square with respect to the plug connector surface A pin and a ground pin of the plug connector disposed so as to be positioned between the plurality of signal pins, and the signal pin and the ground pin are electrically connected to a signal terminal and a ground terminal of the receptacle connector, In the receptacle connector, the signal pad and the ground pad that are electrically connected to the signal terminal and the ground terminal are electrically connected to the signal wiring and the ground wiring of the substrate.
(2) The connector for connection according to (1), wherein a plurality of the coaxial cables are arranged in parallel so that the core wires are arranged in a straight line, and the plug block is crimped by sandwiching an outer conductor of the coaxial cable; A plug connector in which a plurality of plug blocks are arranged so that a core wire of the coaxial cable and a ground terminal provided in the plug block are arranged in a two-dimensional array, and the core wire and the ground of the coaxial cable in the two-dimensional array; A connector for connection, wherein terminals are arranged alternately.

  ADVANTAGE OF THE INVENTION According to this invention, the connector for a connection which can prevent the malfunctioning of the apparatus resulting from the radiation noise inside an apparatus can be provided.

It is a perspective view of the connector for connection concerning the present invention. It is a figure which shows arrangement | positioning of the coaxial connector of the connector for connection which concerns on this invention. It is sectional drawing of the coaxial cable connector of the connector for connection which concerns on this invention. It is a figure which shows the pad arrangement | positioning of the plug connector board | substrate of the connector for connection based on this invention. It is a figure which shows pin arrangement | positioning of the plug connector board | substrate of the connector for connection which concerns on this invention. It is a figure which shows the pin socket arrangement | positioning of the receptacle connector of the connector for connection based on this invention. It is a figure which shows the footprint of the receptacle connector of the connector for connection based on this invention. It is a figure which shows the signal layer wiring of the receptacle connector of the connector for connection based on this invention. It is a figure which shows the assembly method of the plug connector unit of the connector for connection which concerns on this invention. It is a figure which shows the structure of the plug connector of the connector for connection which concerns on this invention. It is a figure which shows the footprint of the conventional connector. It is a figure which shows the ground inductance reduction effect in the connector for connection based on this invention, and the conventional connector for connection. It is a figure which shows the assembly method of the plug connector unit of the connector for connection which concerns on this invention. It is a figure which shows arrangement | positioning of the Twinax cable of the connector for connection which concerns on this invention. It is a figure which shows the pad arrangement | positioning of the plug connector board | substrate of the connector for connection based on this invention. It is a figure which shows the footprint of the receptacle connector of the connector for connection based on this invention. It is a figure which shows the signal layer wiring of the receptacle connector of the connector for connection based on this invention.

  An example of an embodiment of a connector for connection according to the present invention will be described with reference to FIGS.

  FIG. 1 shows a perspective view of a connector for connection according to the present invention. The connection connector according to the present invention includes a coaxial cable 101, a plug connector 102, a receptacle connector 103, a plug connector outer frame 104, a plug connector substrate 105, a substrate side pad 106, and solder balls 107. Plug connectors 102 are connected to both ends of a plurality of coaxial cables 101 arranged two-dimensionally, and receptacle connectors 103 and plug connectors 102 connected by board-side pads 106 and solder balls 107 are fitted and electrically connected. .

  FIG. 2 shows a two-dimensional arrangement of coaxial connectors that connect to plug connectors. In the connection connector according to the present invention, 40 coaxial cable connectors 201 having a diameter of 0.5 mm are arranged in a staggered manner at intervals of 1 mm in the direction perpendicular to the plug connector surface 202. However, the arrangement of the coaxial cable connector 201 may be any arrangement that has regularity so that the distance from each other is constant.

  FIG. 3 is a cross-sectional view of the coaxial cable connector of the connection connector according to the present invention, and the electrical connection inside the coaxial cable connector is shown in FIG. The cross-sectional view of the connector for connection is via the substrate 310, the solder ball 307, the substrate-side signal pad 308 and the substrate-side ground pad 309 that connect the solder ball 307 and the substrate 310, and the substrate-side signal pad 308 and the substrate-side ground pad 309. The laminated board 306 connected to the solder balls 307, the receptacle connector 303 formed on the laminated board 306, the pin socket layer 311, the signal pin 304, the ground pin 305 and the plug connector 302, and the board-side signal pad 308 are electrically connected. And a coaxial cable connector 301 to be connected.

  A pin terminal having a length of about 1 mm provided at a lower portion of the plug connector 302 connected to the coaxial cable connector 301 is inserted into a pin socket of the receptacle connector 303. The receptacle connector 303 has a structure in which a pin socket layer 411 having a thickness of about 1.5 mm and a laminated substrate 306 having a thickness of about 2 mm are combined. The laminated substrate 306 is composed of a ground layer, a signal layer, a signal layer, and a ground layer. It becomes a layer structure. There are two types of pin terminals inserted into the pin socket layer 411: signal pins 304 and ground pins 305. The wiring electrically connected to the signal pins 304 extends from the inside of the connector to the outside in the signal layer of the multilayer substrate 306. It spreads and is electrically connected to the substrate-side signal pad 308 via a solder ball 307 having a diameter of about 1 mm. Similarly, the ground pin 305 is electrically connected to the substrate-side ground pad 309 through the ground layer.

  In the plug connector 302, the signal line of the coaxial cable connector 301 and the signal pin 304 are electrically connected by the plug connector board 501, and the pad arrangement of the plug connector board is shown in FIG.

  The signal pad 402 for connecting the core wire of the coaxial cable connector 301 and the plug connector substrate 401 is disposed adjacent to the ground pad 403 electrically connected to the outer conductor of the coaxial cable connector 301 at an interval of 1 mm. Note that it is desirable that the plug connector board signal pad 402 is always adjacent to two or more ground pads 403.

  The plug connector substrate signal pad 402 and the plug connector substrate ground pad 403 are electrically connected to pin terminals provided on the back surface of the plug connector substrate 401, and are arranged as shown in FIG.

  The signal pins 502 provided through the plug connector substrate 501 having a thickness of 1.5 mm are electrically connected to the plug connector substrate signal pad 402. Similarly, the ground pin 503 is electrically connected to the plug connector substrate ground pad 403. For this reason, the pin arrangement is the same 1 mm interval as the pad arrangement.

  FIG. 6 is a diagram showing the pin socket arrangement of the receptacle connector of the connector for connection according to the present invention. The pin socket 603 provided in the pin socket layer 411 of the receptacle connector 303 into which the signal pin 502 and the ground pin 503 are inserted is located at a position where the pin terminal can be inserted when the plug connector 601 and the receptacle connector 602 are fitted. Provided.

  FIG. 7 is a view showing the footprint of the receptacle connector of the connector for connection according to the present invention. The footprint which becomes an electrical connection point with the board | substrate when the receptacle connector 303 is mounted in a board | substrate is shown. The board-side signal pad 702 and the board-side ground pad 703 are arranged in a grid shape at intervals of 1 mm immediately below the receptacle connector 701, and are connected to the receptacle connector-side pad via the solder balls 307. The board-side signal pad 702 is disposed adjacent to the board-side ground pad 703 similarly to the arrangement of the coaxial cable connector 301.

  FIG. 8 is a diagram showing the wiring in the signal layer of the receptacle connector of the connector for connection according to the present invention, and shows the routing of the wiring in the connector from the core wire of the coaxial cable to the pad of the receptacle connector. The core wires 805 of the coaxial cable are collected by a plug connector 801 and are staggered at intervals of 1 mm. The wiring is routed in the signal layer of the receptacle connector 802 from the arrangement of the core wire 805 of the coaxial cable to the board-side signal pad 803 of the receptacle connector, but considering the fact that the differential signal is transmitted by the coaxial cable, the wiring length is two. The signal-layer wiring 806 is arranged so as not to differ.

  Next, a process for creating the connector for connection according to the first embodiment will be described.

  First, the end of the coaxial cable is cut, and the outer conductor and the insulator are cut with a laser or the like so that the core wire is exposed by about 1 mm.

  The plug connector is composed of a plurality of plug blocks. The plug block is composed of five coaxial cables 901 in one row as shown in FIG. 9 showing a method of assembling the plug connector unit of the connector for connection according to the present invention. Four of them are arranged and formed by crimping the outer conductor portion with an aluminum ground block 902. The crimping method between the ground blocks may be a fitting structure, or the joint may be welded with solder or the like. In the first embodiment, 40 coaxial cables are handled as one harness, but more plug cables may be handled as one harness by increasing the number of plug blocks.

  The core wire and the ground block protrusion of the coaxial cable of the plug block are arranged in a grid pattern, and the protrusion of the core wire and the ground block are soldered to the plug connector board pad 904 on the plug connector board 903. The plug connector board 903 is an FR4 board in which a plug connector board pad 904 having a diameter of 0.6 mm is provided on one surface of the surface layer at intervals of 1 mm, and an aluminum pin terminal having a diameter of about 0.3 mm is provided at the center of the pad. Pin terminals are provided on the back surface by penetrating the substrate.

  FIG. 10 is a diagram showing the configuration of the plug connector of the connector for connection according to the present invention. In the plug connector, the coaxial cable 1001 has four plug blocks A1002 and five plug blocks B1003 arranged alternately, and the outermost periphery is fixed with an aluminum plug connector outer frame 1004 having a thickness of about 1 mm.

  The receptacle connector includes a pin socket layer and a four-layer substrate. A socket having a diameter of about 0.5 mm is provided on the pin socket layer in accordance with the pin position of the plug connector. An aluminum metal terminal is provided in the resin socket, and an electrical connection is obtained by contact with the inserted pin. The four-layer board is manufactured as a four-layer laminated board having an insulating layer FR4, a ground plane and pads on the surface layer, and two signal wiring layers on the inner layer. The surface layer on the pin socket side is provided with a 0.6 mm pad at the pin position and connected to the terminal of the pin socket layer. The signal wiring drawn from the pin socket to the inner layer is electrically connected to the board-side pad by drawing the wiring as shown in FIG.

  Since the receptacle connector is mounted on the substrate with solder balls, the solder ball is placed on the pad during mounting, and the receptacle substrate is placed and reflowed. The solder balls to be used and the reflow temperature were selected in consideration of the mounting reliability depending on the size of the receptacle connector, and in this example, reflow was performed 200 degrees using lead-free solder. In this embodiment, an aluminum member is used for the metal part for ease of processing, but it may be made of other metal such as copper in consideration of improvement of transmission characteristics.

  Next, the operation of the connection connector according to the first embodiment will be described.

  FIG. 11 is a view showing a footprint of a conventional connector, and FIG. 12 is a view showing a ground inductance reduction effect in the connection connector according to the present invention and the conventional connection connector. In a general connector, as shown in FIG. 11, the ground pad 1102 is located at the end of the footprint, so that the distance from the signal pad 1101 near the center of the connector 1103 increases, and the characteristic 1202 of the conventional connector shown in FIG. As shown, the ground inductance of the signal near the center is large. On the other hand, in the present embodiment, when the coaxial cable is electrically connected to the substrate, the distance between the signal wiring and the ground wiring becomes the shortest. Therefore, regardless of the position of the signal pad as in the characteristic 1201 of the present invention shown in FIG. Compared to a conventional connector, the ground inductance can be greatly reduced. In addition, by suppressing variations in transmission characteristics between signal pins, it is possible to reduce variations in common mode current in the cable harness that is maximum at the center pin in the conventional connector.

  As described above, according to the present invention, the common mode current flowing through the outer conductor of the coaxial cable due to the ground inductance can be reduced, and the cable radiation noise due to the common mode current can be suppressed.

  An example of an embodiment of a connector for connection according to the present invention will be described with reference to FIGS.

  The embodiment 2 is a connector in which the coaxial cable having one signal wiring per shield in the first embodiment is replaced with a Twinax cable 1301 including two signal wirings per shield. FIG. 13 is a view showing a method of assembling the plug connector unit of the connector for connection according to the present invention. The specific difference between the second embodiment and the first embodiment is that a Twinax cable 1301, as shown in FIG. The arrangement is such that two plug connector substrate signal pads 1305 on the plug connector substrate 1304 are continuous by providing two differential signal lines 1302. At this time, since the differential wiring mainly includes coupling between signals, it is not necessary to surround the entire circumference of the signal wiring with the ground wiring. For this reason, the plug connector substrate ground pad 1306 is disposed only at two positions adjacent to the plug connector substrate signal pad 1305.

  FIG. 14 is a view showing the arrangement of the Twinax cable of the connector for connection according to the present invention. In the second embodiment, the Twinax cable 1401 is arranged perpendicular to the plug connector surface 1402 and 3 × 10 Twinax cables 1401 are connected by one connector.

  FIG. 15 is a view showing the pad arrangement of the plug connector board of the connector for connection according to the present invention. The arrangement of GSSG (G: ground pad 1503, signal pad: 1502) is repeated on the plug connector substrate 1501.

  In this embodiment, a Twinax cable having two signal wirings in one shield is used. However, even in a cable having a plurality of signal lines inside the shield, radiation noise is generated by the same mechanism as in the first embodiment. The cable that can be applied in (3) may be a cable having three or more signal lines in the shield.

  Next, the creation process of Example 2 will be described.

  The tip of the Twinax cable 1301 is cut, and the outer conductor and the insulator are cut with a laser or the like so that the core wire is exposed to about 1 mm.

  The plug connector is composed of a plurality of plug blocks. The plug block is formed by arranging three Twinax cables 1301 in a row and crimping the outer conductor portion with an aluminum ground block 1302 as shown in FIG. The fixing method between the ground blocks may be a fitting structure, or the joint may be fixed with solder or the like.

  As shown in FIG. 14, the plug connector has 10 plug blocks 1403 arranged, and the outermost periphery is fixed with an aluminum plug connector outer frame 1002 having a thickness of about 1 mm. In the second embodiment, the ground block 1302 and the plug connector outer frame 1002 may be made of a conductor other than aluminum.

  The signal line of the Twinax cable and the protrusion of the ground block in a state where the plug block 1403 is fixed are positioned in a GSSG shape and can be connected to the pads of the plug connector substrate 1304 directly below by soldering. The plug connector board is an FR4 board in which 0.6 mm diameter pads are provided on one side at intervals of 1 mm in the same manner as in the first embodiment, and the center of the pad is an aluminum pin terminal with a diameter of about 0.3 mm. A pin terminal is provided on the back surface by penetrating through. However, two signal pads 1305 of the second embodiment need to be adjacent to each other, and the ground pads 1306 are arranged so as to be adjacent to the outside in the column direction.

  The receptacle connector of the second embodiment is made in the same manner as the first embodiment, but the second embodiment is different in the following points. FIG. 16 is a view showing a footprint of the receptacle connector of the connector for connection according to the present invention. As shown in FIG. 16, the pin socket position of the receptacle connector is designed so that the sides of the plug connector 1601 and the receptacle connector 1602 are parallel and the plug connector 1601 is positioned at the center of the receptacle connector 1602. Further, the pin arrangement of the plug connector 1601 and the pin socket arrangement of the receptacle connector 1602 maintain the GSSG-like positional relationship as in the pad arrangement of FIG. 14, and the board-side signal pad 1603, board-side ground pad 1604 of the receptacle connector 1602, The arrangement of is also the same GSSG arrangement. FIG. 17 is a diagram showing the signal layer wiring of the receptacle connector of the connection connector according to the present invention. As shown in FIG. 17, the signal layer wiring 1705 of the receptacle connector 1702 extends from the center of the connector to the outer periphery. Design by routing.

  Next, the operation of the connection connector according to the second embodiment will be described.

  In the second embodiment, when the Twinax cable is electrically connected to the substrate, the distance between the signal wiring and the ground wiring is minimized, and the ground inductance can be greatly reduced as compared with the conventional connector. Further, even if a plurality of Twinax cables are connected, the arrangement is uniform, so that variation in transmission characteristics of each cable can be suppressed and variation in common mode current in the cable harness can be reduced. From the above, it is possible to reduce the common mode current flowing through the outer conductor of the Twinax cable due to the ground inductance, and to suppress the cable radiation noise due to the common mode current.

1103 Connector, 1101, 308, 702, 803, 1603 Board side signal pad, 1102, 309, 703, 804, 1604 Board side ground pad, 101, 201, 301, 901, 1001 Coaxial cable connector, 102, 302, 601, 801, 1601 Plug connector, 103, 303, 602, 701, 802, 1602 Receptacle connector, 104, 1004 Plug connector outer frame, 105, 401, 501, 903, 1304, 1501 Plug connector board, 106 Board side pad, 107, 307 Solder ball, 202, 1402 Plug connector surface, 304, 502 Signal pin, 305, 503 Ground pin, 306 Multilayer substrate, 310 substrate, 402, 1502 Plug connector substrate signal pad, 4 3, 1502 Plug connector board ground pad, 603 pin socket, 805 coaxial cable core wire, 806 signal layer wiring, 902, 1303 ground block, 904 plug connector board pad, 1002 plug block A, 1003 plug block B, 1201 Characteristics, 1202, conventional connector characteristics, 1301, 1401 Twinax cable, 1302 signal line, 1403 plug block

Claims (3)

Multiple coaxial cables,
A plug connector provided at an end of a harness in which a plurality of coaxial cables are bundled and a core wire is two-dimensionally arranged;
A plurality of two-dimensionally arranged signal pins with respect to the plug connector surface;
A ground pin disposed between the plurality of signal pins;
A substrate electrically connectable to the signal pins and the ground pins;
A solder ball disposed between the substrate and the plug connector;
A receptacle connector disposed between the solder ball and the plug connector;
The signal pin and the ground pin can be electrically connected to a signal terminal and a ground terminal of the receptacle connector, respectively.
A connector for connection, wherein a signal pad and a ground pad electrically connected to the signal terminal and the ground terminal in the receptacle connector are electrically connected to a signal wiring and a ground wiring of the substrate. The connector for connection according to claim 1,
Furthermore, it has a plurality of plug blocks that are crimped across the outer conductor of the plurality of coaxial cables,
The plurality of coaxial cables are arranged in parallel so that the core wires are arranged in a straight line,
In the plug connector, the connector for connection is a two-dimensional array in which core wires of the plurality of coaxial cables and ground terminals of the plurality of plug blocks are alternately arranged. In the connector for connection in any one of Claim 1 or 2,
Core wires of the plurality of coaxial cables are soldered in a direction perpendicular to pads provided on one surface of the substrate,
A connector for connection, wherein a pin provided on a surface facing the one surface of the substrate electrically connected to the pad can be electrically connected to a conductor in the receptacle connector.

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