JP2011040405A - Cable assembly with wiring board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further downsize a mounting space of a cable assembly with a wiring board. <P>SOLUTION: Coaxial cables 12ai and 12bi are arranged on a surface part 16A and a back surface part 16B of a wiring board 16, respectively, so that cross-sections of the coaxial cables 12ai and 12bi are arranged in the form of a cross stitch with the wiring board 16 sandwiched in between. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cable assembly with a wiring board having a plurality of cables in parallel.

  A cable connector is practically used for electrical connection between electrical components inside an electronic device. For example, the cable connector electrically connects an electrical component to a printed wiring board via a cable assembly with a wiring board. Such a cable assembly with a wiring board includes, for example, a plurality of coaxial cables arranged in parallel to each other, and a flexible circuit board to which connection ends of the respective coaxial cables are connected, as shown in Patent Document 1 as well. Is included as a main element. Conductive patterns (referred to as connection patterns in Patent Document 1) to which the connection ends of the respective coaxial cables are connected are formed on both surfaces of the flexible circuit board so as to face each other. Thereby, the connection ends of the respective coaxial cables are arranged to face each other with the flexible circuit board interposed therebetween.

  With such a configuration, when the number of coaxial cables increases due to an increase in the data transmission capacity of electrical equipment, the width of flexible circuit boards and connectors can be made smaller, so mobile phones, digital cameras, laptop computers Thus, the electronic devices such as these can be miniaturized.

JP 2005-259598 A

  When the connection ends of the coaxial cables in the cable assembly with a wiring board are arranged opposite to each other with the flexible circuit board interposed therebetween as described above, the mounting space of the cable assembly with the wiring board has an outer diameter of the coaxial cable. A space with about twice the size is required. That is, it is difficult to make the mounting space thinner than about twice the outer diameter of the coaxial cable provided on both surfaces of the flexible circuit board because the coaxial cables overlap each other.

  However, in the current situation where electronic devices such as mobile phones tend to be smaller and lower in profile, it is desired to further reduce the mounting space of the cable assembly with a wiring board.

  In view of the above problems, the present invention provides a cable assembly with a wiring board having a plurality of cables in parallel, and a cable assembly with a wiring board that can further reduce the mounting space of the cable assembly with a wiring board. The purpose is to provide.

In order to achieve the above-described object, a cable assembly with a wiring board according to the present invention includes a plurality of cables and a plurality of first contact pads formed in a line on at least one of a front surface portion and a back surface portion. And a plurality of second contact pads, which are arranged in a staggered manner together with the first contact pads on a common plane with the first contact pads, and each end of the cable is connected to each other, and the first contacts A plurality of third electrodes electrically connected to the pad, formed on a plane opposite to the common plane, and connected to one end of each cable.
And a cross section of a cable connected to the second contact pad and a cross section of the cable connected to the third contact pad sandwiching the wiring board One end of the cable is disposed on the front and back surfaces of the wiring board so that the end of the cable is located in the state where the end face of the outer peripheral part of the cable is opposed to and close to the end face of the wiring board. The inner conductor protruding from the second contact pad is connected to the second contact pad or the third contact pad.

  According to the cable assembly with a wiring board according to the present invention, the cross section of the cable connected to the second contact pad and the cross section of the cable connected to the third contact pad are staggered across the wiring board. One end of the cable is disposed on the front and back surfaces of the wiring board so that the end of the cable is located in the state where the end face of the outer peripheral part of the cable is opposed to and close to the end face of the wiring board. Since the inner conductor protruding from the second conductor pad is connected to the second contact pad or the third contact pad, the mounting space of the cable assembly with a wiring board can be further reduced.

It is a front view which shows the principal part of an example of the cable assembly with a wiring board which concerns on this invention. It is a perspective view which shows one edge part of an example of the cable assembly with a wiring board which concerns on this invention. It is a perspective view which expands and shows a part in the example shown by FIG. It is a perspective view which shows the back surface side part in the part shown by FIG. It is a top view which expands and shows a part shown by FIG.

  FIG. 2 shows the appearance of the main part of an example of the cable assembly with a wiring board according to the present invention.

  In FIG. 2, a cable assembly with a wiring board 10 includes a pair of wiring boards 16 having a conductor pattern, which will be described later, and coaxial cables 12ai connected to the conductor patterns on the front surface portion 16A and the back surface portion 16B of each wiring substrate 16, respectively. 12bi (i = 1 to n, n is a positive integer). In FIG. 2, only one wiring board 16 is shown.

  The wiring board 16 of the cable assembly with wiring board 10 is electrically connected to a cable connector as disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-73411.

  The wiring board 16 is, for example, a flexible wiring board, and has a configuration in which a plurality of conductive layers covered with a protective layer are formed on both surfaces of an insulating base material. The insulating substrate is formed of, for example, a liquid crystal polymer having a thickness of about 50 μm, glass epoxy resin, polyimide (PI), polyethylene terephthalate (PET), or polyetherimide (PEI). The protective layer is formed of, for example, a thermosetting resist layer or a polyimide film. In addition, since the structure of the wiring board 16 in the both ends of the cable assembly with wiring board 10 has the same structure, only one end of the assembly 10 will be described, and the description of the other end will be omitted. .

  A first contact pad 16CPAi (i = 1 to n, n is a positive integer) is provided along the width direction of the wiring substrate 16 at the end of the surface portion 16A of the insulating base material in the wiring substrate 16. They are formed parallel to each other at intervals. Each first contact pad 16CPAi is formed of a copper alloy layer, and bumps 16bi (i = i = n are positive integers) on each conductive layer 16SLBi (i = 1 to n, where n is a positive integer) as a conductor pattern of a back surface portion 16B described later. 1 to n and n are positive integers).

  The first contact pad 16CPAi is formed as a signal line and a ground line, for example.

  Second contact pads 16SLAi (i = 1 to n, n are positive integers) are adjacent to each other on a common plane with the row of first contact pads 16CPAi, and are spaced at predetermined intervals along the width direction of the wiring board 16. They are formed parallel to each other. Each second contact pad 16SLAi is formed at a position corresponding to between two adjacent first contact pads 16CPAi. Therefore, as shown in FIG. 5, the first contact pad 16CPAi and the second contact pad 16SLAi are formed in a staggered manner on a common plane. The second contact pad 16SLAi is formed as another signal line and a ground line different from the first contact pad 16CPAi.

  At the end of the second contact pad 16SLAi in the direction away from the first contact pad 16CPAi, that is, at the portion between the cover lay member 14 and the cover lay member 15 described later, a coaxial cable 12ai described later. The inner conductor 12C is fixed by soldering.

  Further, as shown in FIG. 3, a cover lay member having the same thickness is provided at an intermediate portion of each second contact pad 16SLAi and an outermost end portion in a direction away from the first contact pad 16CPAi. 14 and 15 are respectively stacked on the second contact pads 16SLAi along the arrangement direction of the second contact pads 16SLAi.

  Thus, even when the wiring board 16 is twisted in the direction in which the second contact pad 16SLAi is peeled off with the coaxial cable 12ai, the second contact is reinforced by the coverlay members 14 and 15. The situation where the pad 16SLAi peels is avoided. The coverlay members 14 and 15 are similarly formed on each conductive layer 16SLBi of the back surface portion 16B described later.

  On the other hand, as shown in FIG. 4, the reinforcing plate 18 is laminated on the back surface portion 16 </ b> B so as to cover a part of the coverlay member 14. The reinforcing plate 18 suppresses deformation of the wiring board 16 when the wiring board 16 is connected to the cable connector described above. Further, a third contact pad is formed at the end of the reinforcing plate 18 so that the end of each conductive layer 16SLBi is exposed. Each conductive layer 16SLBi is formed at a position corresponding to the space between the adjacent second contact pads 16SLAi on the back surface portion 16B. Therefore, the conductive layer 16SLBi and the second contact pad 16SLAi are formed in a so-called staggered arrangement in the thickness direction of the wiring board 16. The inner conductor 12C of the coaxial cable 12bi is fixed to each third contact pad by soldering. As a result, conductive layers (conductor patterns) are formed on both surfaces of the wiring board 16.

  Since the coaxial cables 12ai and 12bi have the same structure, the coaxial cable 12ai will be described, and the description of the coaxial cable 12bi will be omitted.

  The coaxial cable 12ai includes, for example, a cylindrical inner conductor 12C and a cylindrical outer conductor having a diameter larger than the diameter of the inner conductor 12C concentrically with the inner conductor 12C, as shown in FIG. 12E as a main element. An annular insulator 12Sc is provided between the inner conductor 12C and the outer conductor 12E. Further, the outer peripheral portion of the outer conductor 12E is covered with a sheath 12Sa.

  As shown in an enlarged view in FIG. 1, the coaxial cable 12bi is fixed to the back surface portion 16B at a position corresponding to the space between the coaxial cables 12ai that are fixed adjacent to the front surface portion 16A.

  That is, the coaxial cable 12ai and the coaxial cable 12bi are fixed so that the cross-section thereof is in a staggered arrangement with the wiring board 16 in between. Therefore, in FIG. 1, the coaxial cable 12bi is connected from the outermost end of the coaxial cable 12ai. The maximum dimension T up to the outermost end of the outer peripheral portion can be made smaller than the corresponding dimension of the conventional cable assembly.

  The end surfaces of the sheath 12Sa in the coaxial cable 12ai and the coaxial cable 12bi are arranged opposite to each other and close to the end surface of the wiring board 16.

  Further, compared to the case where the sheaths of the coaxial cables 12ai and 12bi are arranged on the wiring board 16, only the inner conductor 12C of the coaxial cables 12ai and 12bi is fixed by soldering, so that the coaxial cable 12ai is more than the thickness of the sheath. And 12bi can be brought closer to each other.

DESCRIPTION OF SYMBOLS 10 Cable assembly with wiring board 12ai, 12bi Coaxial cable 14, 15 Coverlay member 16 Wiring board

Claims (2)

Multiple cables,
A plurality of first contact pads formed in a line on at least one of the front surface portion and the back surface portion, and arranged in a staggered pattern together with the first contact pads on a common plane with the first contact pads One end of each of the cables is formed on a plurality of second contact pads to be connected to each other and a plane that is electrically connected to the first contact pads and that faces the common plane, A plurality of thirds each connected to one end of the cable
A wiring board having a contact pad of
One end of the cable so that the cross section of the cable connected to the second contact pad and the cross section of the cable connected to the third contact pad are staggered across the wiring board Are respectively disposed on the front surface portion and the back surface portion of the wiring board,
The inner conductor protruding from the end of the cable is connected to the second contact pad or the third contact pad with the end face of the outer periphery of the cable facing and close to the end face of the wiring board. A cable assembly with a wiring board. Coverlay members that suppress peeling of the second contact pad or the third contact pad are arranged at two positions with a predetermined interval in the extending direction of the second contact pad or the third contact pad. Formed so as to straddle the adjacent second contact pad or the third contact pad,
The wiring board according to claim 1, wherein an inner conductor protruding from an end of the cable is connected to a portion between the coverlay members in the second contact pad or the third contact pad. With cable assembly.

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