JP2019216062A - Transmission cable module and transmission cable - Google Patents

Abstract

To provide a transmission cable module that can facilitate routing of a transmission cable, and provide a transmission cable.SOLUTION: A transmission cable module has a transmission cable having a plurality of signal cables, and an electric connector disposed at both ends of the transmission cable, the transmission cable having a flat cable part in which the plurality of signal cables connected to the electric connector are arranged in one direction, and a converted cable part that is more flexible than the flat cable part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a transmission cable module and a transmission cable, and more particularly to a transmission cable module and a transmission cable that enable large-capacity signal transmission.

  As a prior art of a transmission cable, there is Patent Document 1. In Patent Literature 1, a long flexible printed wiring is provided with folded portions for folding the cable main body in advance at predetermined intervals in the width direction so that the cable main body can be easily folded. Therefore, it is disclosed that a transmission cable having a shape that can be accommodated in one flexible printed wiring by overlapping a large number of signal lines can be formed, and the thickness and width can be suppressed.

  In addition, in Patent Document 2, when a wire that can expand and contract is required, such as a movable portion of a robot, the wire can be expanded or contracted or twisted by having a spiral portion formed in a spiral shape. A flexible circuit board is disclosed.

JP 2001-93353 A JP 2011-228077 A

  2. Description of the Related Art In recent years, in a data center, transmission within a device has been accelerated with an increase in the amount of data to be processed by the device, and 100 Gbps / lane class transmission is required. In such 100 Gbps / lane-class transmission, transmission over a board is limited even at short distances, and it is predicted that the need for on-board cable transmission will increase. In on-board cable transmission, it is required that the cable can be easily routed because the cable is arranged while avoiding components on the board.

  In the transmission cable disclosed in Patent Literature 1, since a large number of signal lines are overlapped, it is difficult to route the transmission cable while avoiding components arranged on the board. In the technique of Patent Document 2, wiring can be expanded or contracted or twisted in a specific direction, but it is not easy to perform wiring in various directions. That is, in the prior art, in order to avoid the components on the board, there is a lack of consideration for facilitating the routing of the wiring.

  An object of the present invention is to provide a transmission cable module and a transmission cable that can facilitate the routing of the transmission cable.

A preferred example of the present invention is a transmission cable module having a transmission cable having a plurality of signal cables and electrical connectors disposed at both ends of the transmission cable,
The transmission cable is a transmission cable module having a flat cable portion in which the plurality of signal cables to be connected to the electrical connector are arranged in one direction, and a converted cable portion having more flexibility than the flat cable portion. is there.

  Further, another preferred example of the present invention is a transmission cable having a plurality of signal cables, wherein the flat cable portion connects to an electrical connector and includes a plurality of the signal cables arranged in one direction; And a converted cable part having more flexibility than the transmission cable.

  According to the present invention, the routing of the transmission cable can be facilitated.

FIG. 2 is a perspective view illustrating a use mode of the transmission cable module according to the first embodiment. FIG. 3 is a plan view illustrating a use mode of the transmission cable module according to the first embodiment. FIG. 2 is a schematic view of a transmission cable module according to the first embodiment. FIG. 2 is a diagram illustrating an internal configuration of a transmission cable module according to the first embodiment. FIG. 8 is a diagram illustrating a configuration of a transmission cable module according to a second embodiment.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

  First Embodiment A first embodiment will be described with reference to FIGS. 1, 2, 3, and 4. FIG. FIG. 1 is a perspective view illustrating a use mode of the transmission cable module according to the first embodiment, FIG. 2 is a plan view illustrating a use mode of the transmission cable module according to the first embodiment, and FIG. 3 is a schematic view of the transmission cable module. It is. FIG. 4 is a diagram illustrating the internal configuration of the transmission cable module according to the first embodiment.

  First, a usage mode of the transmission cable according to the first embodiment will be described with reference to FIGS. 1 and 2. Although not shown in FIG. 1, a host board of the information processing apparatus is shown. FIG. 2 omits the illustration of the heat sink for simplification.

  An LSI 210 for signal processing such as a CPU or a GPU is arranged on the host board 100. Further, a cage 300 arranged inside the front panel into which the transmission / reception module is inserted is fixed to the host board 100. In the first embodiment, an example in which signal transmission between the LSI 210 and the cage 300 is performed by the transmission cable module 500 will be described.

  An electric connector 520 for connecting a transmission cable is mounted near the LSI 210 and the cage 300, and the transmission cable module 500 electrically connects the LSI 210 and the cage 300. The transmission cable module 500 including the transmission cable 510 and the electrical connector 520 reduces transmission loss as compared with wiring on a board, and enables signal transmission of 100 Gbps / lane class.

  The heat sink 200 for cooling is arranged on the LSI 210, and a low-profile connector is used so that the electric connector 520 is arranged below the heat sink 200. With such an arrangement, the distance between the LSI 210 and the electrical connector 520 can be reduced, and a reduction in transmission signal loss is realized.

  Next, the configuration of the transmission cable module will be described with reference to FIGS. As shown in FIG. 3, the transmission cable module 500 includes an electric connector 520 and a transmission cable 510 connecting the electric connectors 520 (in this embodiment, a twinax cable will be described as an example). Near the electrical connector 520 at both ends of the transmission cable module 500, a flat cable portion 511 for electrically connecting to the electrical connector is arranged. The twinax cable, which is an example of a signal cable, has a flat cable shape in which twinax cables are arranged side by side.

  FIG. 4A shows the internal configuration of the flat cable section 511. In each twinax cable, two conductors 603 are covered with a dielectric 602. Further, the flat cable portion 511 is a flat cable in which one twinax cable whose outside is covered with an insulating jacket 601 is defined as one lane, and a plurality of twinax cables are arranged in a lateral direction so as to be in contact with each other. It is.

  Since it is difficult for the flat cable portion 511 to secure flexibility in an arbitrary direction, in this embodiment, the loose wire portion 512 and the gathering portion 513 are provided, and there is a change in the cable form. It is characterized by. The loose wire portion 512 and the gathering portion 513 have higher flexibility than the flat cable portion 511, and will be referred to as a converted cable portion.

  The loose wire portion 512 is obtained by individualizing a bundle of a plurality of signal cables and dividing the bundle into a plurality of cables (a twinax cable in the embodiment). In addition, the loose wire portion 512 is disposed at a portion in the middle of conversion to the flat cable portion 511 and the collecting portion 513.

  Between the flat cable portion 511 and the gathering portion 513, the form is converted via a loose wire portion 512, which is a single flat cable once. In this way, the twinax cable is made into a loose wire, so that the rigidity at the loose wire portion 512 is reduced, so that the twinax cable has flexibility in an arbitrary direction.

  FIG. 4B shows the internal configuration of the collecting unit 513. A structure in which a conductor 603 is covered with a dielectric 602, and a twinax cable composed of a conductor 603 covered with an insulating jacket 601 is vertically and horizontally distributed inside the insulating jacket 604. Is the collecting unit 513. By winding a bundle of a plurality of twinax cables with an insulator, the insulating jacket 604 of the collecting part 513 is formed.

  Here, a shielding conductor 605 is formed on the outer peripheral portion of the insulating jacket 601 in order to suppress electrical crosstalk between twinax cables in the collecting portion 513. In addition, a gap 606 is provided between the twinax cables in the insulating jacket 604 of the collecting portion 513.

  As a method of forming the shielding conductor 605, winding a conductor foil, evaporating a metal material, or the like can be considered, but the thickness of the shielding conductor 605 should be as small as possible in order to secure flexibility in the collecting part 513. Desirably thin.

  The parts having high flexibility are the loose wire portion, the gathering portion, and the flat cable portion from the larger one. The flat cable portion 511 is arranged in the horizontal direction with the cables in contact with each other. As shown in FIG. 4 (a), the vertical direction is not overlapped and can be deformed. Since the cables overlap, it is difficult to route the cables.

  Since the loose wire portion 512 is individualized, it is easy to route the cable in an arbitrary direction. The collecting portion 513 has a lower flexibility than the loose wire portion 512 because a plurality of twinax cables are gathered in the insulating jacket 604. However, the collecting part 513 has a gap 606, and each twinax cable has a degree of freedom in deformation.

  As described above, the flat cable (for example, the Cu wiring) can be bent only in one direction. However, according to the configuration of the transmission cable of the first embodiment, the flat cable can be bent in a plurality of directions, and the degree of freedom of cable routing can be improved. Can be improved. Furthermore, in the first embodiment, since the shield conductor 605 is formed, high-quality signal transmission that can reduce crosstalk between channels can be achieved.

Embodiment 2 will be described with reference to FIG. FIG. 5 is a diagram illustrating the configuration of the transmission cable module according to the second embodiment. The second embodiment has a configuration in which the collecting unit 513 of the first embodiment is changed.
The second embodiment has a configuration in which the collecting unit 513 of the first embodiment is omitted. The flat cable portions 511 for electrically connecting to the electric connector 520 are arranged near the electric connector 520 at both ends, as in the first embodiment, but between the flat cable portions 511 near both ends. Has a configuration in which flat cable portions 511 and loose wire portions 512 are alternately arranged.

  As a result, the loose wire portions 512 are formed at a plurality of locations. In other words, the number of locations where the rigidity is reduced is increased, and the configuration is such that it is possible to have more flexibility in any direction than in the first embodiment.

  As described above, according to the transmission cable configuration of the second embodiment, it is possible to provide a transmission cable that improves the flexibility of cable routing with a simple configuration, reduces crosstalk between channels, and enables high-quality signal transmission. I can do it.

In FIG. 5, the flat cable portion 511 and the loose wire portion 512 are arranged alternately. However, the following structure may be adopted.
In other words, the flat cable portion 511 is arranged on the electrical connector 520 side in the same manner as in the first embodiment. It is good also as composition which arranges and collective part 513 and loose line part 512 are arranged alternately. In this case, the configuration is more flexible than that of the second embodiment.

  In the above embodiment, the conductor 603 forming one lane has been described as a configuration in which two conductors are combined. However, the conductor 603 may be configured with only one conductor.

100 host board, 500 transmission cable module, 510 transmission cable, 511 flat cable part, 512 loose wire part, 513 assembly part, 520 electrical connector

Claims (9)

A transmission cable having a transmission cable having a plurality of signal cables, and electrical connectors disposed at both ends of the transmission cable,
The transmission cable,
A flat cable portion in which the plurality of signal cables connected to the electrical connector are arranged in one direction,
A transmission cable module having a converted cable portion that is more flexible than the flat cable portion. The transmission cable module according to claim 1,
The converted cable part is
A loose wire portion separating a plurality of the signal cables;
A transmission cable module, comprising: an assembly in which a plurality of the signal cables are dispersed and arranged inside an insulating jacket. The transmission cable module according to claim 2,
Arranging the loose wire portion between the flat cable portion and the assembly portion,
The transmission cable module according to claim 1, wherein the signal cable is a twinax cable. The transmission cable module according to claim 2,
The assembly unit arranges a plurality of the signal cables covered by an insulating jacket,
The signal cable has a conductor and a dielectric covering the conductor,
A transmission cable module having a gap between the signal cables. The transmission cable module according to claim 4,
The transmission cable module according to claim 1, wherein the signal cable has a shield conductor that covers the dielectric. The transmission cable module according to claim 1,
The transmission cable module according to claim 1, wherein the transmission cable has a configuration in which a loose wire portion separating the plurality of signal cables and the flat cable portion are alternately arranged. The transmission cable module according to claim 1,
The transmission cable has a configuration in which a loose wire portion separating a plurality of the signal cables and a plurality of the signal cables are collectively arranged and dispersed in an insulating jacket. A transmission cable module, comprising: An information processing apparatus, wherein the transmission cable module according to claim 1 is electrically connected on a substrate. A transmission cable having a plurality of signal cables,
A flat cable portion in which a plurality of the signal cables are connected in one direction to be connected to an electric connector,
A transmission cable having a converted cable portion that is more flexible than the flat cable portion.

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