JP2009170142A - Connection structure and connecting method of coaxial cable harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure and a connection method of a coaxial cable harness in which a stable grounding condition of a ground bar can be secured while keeping a stable conductive connecting condition between a central conductor of the coaxial cable and a connection terminal. <P>SOLUTION: A plurality of coaxial cables 20 are arranged in parallel and at each end portions of the coaxial cables 20, central conductors 21 are conductively connected by soldering respectively with connection terminals 17 arranged in parallel, and external conductors 23 of the coaxial cables 20 are conductively connected with a common ground bar 14. The ground bar 14 has end grounding portions 18 at both ends of a body portion 16 extending in a parallel direction of the coaxial cable 20 and a projected portion 13, at a position other than the end grounding portion 18, which extends from the body portion 16 and is arranged in parallel with the connection terminal 17 and is conductively connected by soldering with an intermediate grounding connection terminal 17a. In a connection facing portion between the projected portion 13 and the intermediate grounding connection terminal 17a, there is formed a concave portion 13a on the projected portion 13 inside which there is a solder S. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connection structure and a connection method for a coaxial cable harness in which a plurality of coaxial cables arranged in parallel are connected to connection terminals.

  In recent years, with the widespread use of notebook computers, mobile phones, small video cameras, and the like, in addition to miniaturization and weight reduction of these electronic devices, high speed and high image quality are required. To meet these requirements, extremely thin coaxial cables are used to connect the device main unit and the liquid crystal display, and wiring in the devices. Also, for ease of wiring, multiple coaxial cables are integrated together. A coaxial cable harness in the shape of a harness is used (see, for example, Patent Document 1).

A coaxial cable used for a coaxial cable harness is configured by sequentially arranging a central conductor, an inner insulator, an outer conductor, and a jacket from the inside in a coaxial manner.
A coaxial cable harness is formed by integrating a plurality of such coaxial cables, and the terminal portion of the coaxial cable harness is connected and fixed to a connector terminal or a substrate having a predetermined pitch by conductive connection such as soldering. An example of a conventional coaxial cable harness is shown in FIGS.

  FIG. 9 shows one end of the coaxial cable harness 1. In the coaxial cable harness 1, a plurality of coaxial cables 2 and an insulated cable 3 are arranged in parallel, and the outer conductor 2 a of the plurality of coaxial cables 2 and the central conductor 3 a of the insulated cable 3 conduct to a common ground bar 4, 5. Connected. The ground bars 4 and 5 are provided with end grounding portions 4a at both ends thereof, and are electrically connected to a grounded connected portion. An intermediate grounding portion including a ground pin 6 is provided between the ground bar 4 and the central conductor 3a of the insulated cable 3 at locations other than the end grounding portion 4a of the ground bar 4, and the ground pin 6 is connected to the central conductor 3a and the central conductor 3a. The ground bar 4 is conductively connected. The ground pin 6 is conductively connected by soldering to a connection terminal 8 provided on a connected member 7 such as a board or a connector. As a result, grounding is performed while fixing the position to the connected member 7 at both ends (end grounding portion 4a) of the ground bar 4, and grounding is also achieved at the intermediate grounding portion (ground pin 6) of the ground bar 4. ing.

JP 2007-280772 A

  When the central conductor of the coaxial cable and the intermediate ground portion of the ground bar are conductively connected to the connection terminals, respectively, it is conceivable to make a batch solder connection with a pulse heater or the like in order to reduce the number of connection steps. However, since the intermediate grounding portion is pressed against the connection terminal when batch soldering is performed, the solder S shown in FIG. 10 is pushed out from between the connection terminal 8 and the intermediate grounding portion (ground pin 6) to the middle. The solder S of the ground portion exists only on the side surface portion, and may not be interposed between the connection terminals 8 in some cases. In particular, when the thickness of the intermediate grounding portion is greater than the height of the central conductor at the time of batch soldering, the tendency is remarkable. FIG. 10 is a cross-sectional view (CC cross-sectional view of FIG. 9) along the cable axial direction in the intermediate ground portion.

  If there is no solder between the connection terminal and the intermediate ground part (the connection surface of the intermediate ground part), the connection strength of the intermediate ground part to the connection terminal will be weak, so the intermediate ground part may be peeled off in the initial state, The intermediate grounding part may be peeled off due to vibration after mounting. In such a case, the grounding performance near the center of the ground bar may become unstable, and the noise removal effect may be insufficient.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a coaxial cable harness connection structure and connection method capable of ensuring a stable grounding state of a ground bar while maintaining a stable conductive connection state between a central conductor and a connection terminal of a coaxial cable. .

The connection structure of the coaxial cable harness according to the present invention that can solve the above problems includes a center conductor, an inner insulator disposed on the outer periphery of the center conductor, and an outer conductor disposed on the outer periphery of the inner insulator. And a plurality of coaxial cables having a jacket disposed on the outer periphery of the outer conductor are arranged in parallel, and the center conductor is soldered to a connecting terminal arranged in parallel at the end of each coaxial cable. Are electrically connected.
The outer conductors of the plurality of coaxial cables are conductively connected to a common ground bar;
The ground bar is arranged in parallel with the connection terminal extending from the main body at a portion other than the end grounding portion at the end grounding portions at both ends of the main body extending in the parallel direction of the coaxial cable. A projecting portion that is conductively connected to the intermediate ground connection terminal by soldering;
A concave portion is formed in at least one of the projecting portion and the intermediate ground connection terminal at a connection facing portion between the projecting portion and the intermediate ground connection terminal, and solder is provided in the concave portion.

  In the connection structure of the coaxial cable harness according to the present invention, the protruding portion has a smaller width than the terminal connection portion between the terminal connection portion and the main body portion conductively connected to the intermediate ground connection terminal. It is preferable that the part is formed.

  In the connection structure of the coaxial cable harness according to the present invention, the ground bar is preferably plated after molding.

The coaxial cable harness connecting method according to the present invention includes a center conductor, an inner insulator disposed on an outer periphery of the center conductor, an outer conductor disposed on an outer periphery of the inner insulator, and the outer conductor. A plurality of coaxial cables having jackets arranged on the outer periphery are arranged in parallel,
The end portion of the coaxial cable is exposed so that the outer conductor, the inner insulator, and the central conductor are exposed stepwise,
The ground bar having a ground bar having an end grounding portion at both ends of the main body portion extending in the parallel direction of the coaxial cable and a projecting portion extending from the main body portion at a place other than the end grounding portion, Conductive connection to the outer conductor of the coaxial cable,
A method for connecting a coaxial cable harness, wherein the central conductor and the protruding portion are conductively connected by batch soldering to a plurality of connection terminals and a connection terminal for intermediate grounding provided in parallel,
During the batch soldering, a recess formed in at least one of the projecting portion and the intermediate ground connection terminal is disposed in a connection facing portion of the projecting portion and the intermediate ground connection terminal, and soldered to the recess. And the projecting portion and the intermediate ground connection terminal are soldered.

  In the method of connecting coaxial cable harnesses according to the present invention, it is preferable that a pressure applied to the intermediate ground connection terminal during the batch soldering is 1.83 MPa or more.

  According to the present invention, there is a recess in at least one connection-facing portion of the protrusion provided at a location other than the end grounding portion at both ends of the ground bar and the intermediate ground connection terminal connected to the protrusion. Therefore, even when the projecting portion is strongly pressed against the intermediate ground connection terminal at the time of batch solder connection, the molten solder enters the recess and remains. Therefore, the solder in the concave portion strongly adheres the protruding portion and the intermediate ground connection terminal, so that sufficient connection strength can be secured. Therefore, it is possible to obtain a stable conductive connection state between the central conductor of the coaxial cable and the connection terminal by batch soldering with a relatively strong pressing force, and to secure a stable grounding state at the intermediate portion of the ground bar.

Hereinafter, an example of an embodiment of a coaxial cable harness connection structure and a connection method according to the present invention will be described with reference to the drawings.
The connection structure of the coaxial cable harness according to the present invention has various forms such as a case where the connector is attached to both ends of the coaxial cable harness, a case where the connector is attached only at one end and the other end is connected to the substrate. Although it can take, the structure of the one end side is demonstrated with the connection method in the connection structure of the following coaxial cable harnesses.

  FIG. 1 is a plan view showing a connection structure of a coaxial cable harness according to the present embodiment, FIG. 2 is a sectional view of a coaxial cable used in the coaxial cable harness of FIG. 1, and FIG. FIG. 3 and FIG. 3B are cross-sectional views taken along the line BB in FIG.

  As shown in FIG. 1, the coaxial cable harness 10 includes a plurality of (for example, 34) coaxial cables 20 of the same type and the same size arranged in parallel. The outer conductor 23 is conductively connected to the common ground bar 14, and the central conductor 21 and the ground bar 14 of each coaxial cable 20 are electrically connected to the connection terminal 17 and the intermediate ground connection terminal 17a arranged in parallel by soldering. It has a connected connection structure. The plurality of connection terminals 17 and intermediate ground connection terminals 17a are provided in parallel at a predetermined pitch (for example, 0.3 mm) on the connected member 11 that is a connector or a substrate.

  As shown in FIG. 2, the coaxial cable 20 is arranged on the outer periphery of the central conductor 21, the inner insulator 22 disposed on the outer periphery thereof, the outer conductor 23 disposed on the outer periphery of the inner insulator 22, and the outer conductor 23. It has an insulative jacket 24 provided, and these are arranged coaxially.

  As the coaxial cable 20, for example, a cable corresponding to the AWG 42 according to the AWG (American Wire Gage) standard, or a cable thinner than the AWG 42 is used. In the coaxial cable 20 of the AWG 42, the central conductor 21 is formed by twisting seven strands 21a of silver-plated copper alloy having an outer diameter of 0.025 mm, for example. The inner insulator 22 is made of a fluororesin such as PFA, which covers the outer peripheral surface of the center conductor 21, and has an outer diameter of 0.17 mm. Further, the outer conductor 23 is formed to have an outer diameter of 0.23 mm by winding a strand 23a of, for example, a silver-plated copper alloy having an outer diameter of 0.03 mm around the outer peripheral surface of the inner insulator 22 in a spiral manner. . In addition, the jacket 24 is made of a fluororesin such as PFA that covers the outer peripheral surface of the outer conductor 23. In the case of the AWG 42, the jacket 24 is formed with an outer diameter of 0.31 mm.

As shown in FIGS. 1 and 3, the end portion of the coaxial cable 20 is subjected to lead processing, and the center conductor 21, the inner insulator 22, and the outer conductor 23 are exposed step by step in a predetermined length in order from the tip side. is doing. In the coaxial cable harness 10, all the coaxial cables 20 are arranged in parallel, the external conductors 23 aligned with each other are sandwiched between two common ground bars 14 and 15 and are electrically connected by soldering.
In addition to the coaxial cable 20, the coaxial cable harness 10 may include an insulated cable constituted by a center conductor and a jacket.

  The ground bars 14 and 15 are formed in a plate shape having a constant thickness and a length that can contact the outer conductors 23 of all the coaxial cables 20 that are in contact with each other or arranged in parallel at a predetermined interval. For example, it is formed by punching a conductive metal plate such as a copper plate. The ground bar 15 disposed closer to the connected member 11 has a thin rectangular shape extending in the parallel direction of the coaxial cable 20, and the ground bar 14 disposed farther from the connected member 11 is connected to the coaxial cable 20. A thin rectangular main body portion 16 extending in the parallel direction, and projecting portions 13 extending from the main body portion 16 in the axial direction of the coaxial cable 20 at locations other than the end grounding portions 18 at both ends of the main body portion 16. ing.

In addition, the ground bars 14 and 15 include common end grounding portions 18 that are conductively connected to the grounding terminals 17c of the connected member 11 by soldering at both ends of the coaxial cable 20 in the parallel direction.
The protruding portion 13 of the ground bar 14 functions as an intermediate ground portion of the ground bar 14 by being conductively connected to one or a plurality of intermediate ground connection terminals 17a by soldering. In this embodiment, the protruding portion 13 is integrally formed with the main body portion 16 of the ground bar 14. The protruding portion 13 can be formed separately from the main body portion 16 and connected to the main body portion 16, but it is preferable that the protruding portion 13 is integrally formed because the number of connecting steps is reduced.

  In addition, as shown in FIG. 3, a recessed portion 13a is formed in the protruding portion 13 at the connection facing portion between the protruding portion 13 and the intermediate ground connection terminal 17a, and solder S is provided in the recessed portion 13a. As a result, a layer of solder S is formed between the protruding portion 13 and the intermediate ground connection terminal 17a, and the protrusion 13 and the intermediate ground connection terminal 17a are strongly bonded by the solder S, so that sufficient connection strength is obtained. It is secured.

  In addition, the side surface (plate thickness portion) 13b of the protruding portion 13 also has solder S protruding from the concave portion 13a, so that the outer peripheral portion in plan view of the protruding portion 13 is fixed to the intermediate ground connection terminal 17a, and the conductive connection Has been. The ground bar 14 can be molded (so-called pre-plating) by punching a plate-like member such as a tin plate or a gold-plated copper plate. In this case, plating is present only on the upper and lower surfaces. In consideration of the presence of solder S on the side surface 13b of the protruding portion 13, it is preferable that the side surface 13b is also plated in order to improve solder wettability. Therefore, it is preferable that the ground bar 14 is formed by punching a plate-like member and molding it, and then dipping it in a plating solution to perform post-plating.

  When the connected member 11 is not a substrate but a connector, a metal plate shell (not shown) having a U-shaped cross section is placed on one ground bar 14 and soldered. The ground bar 14 is grounded by connecting both ends of the shell to the ground connection portion of the connector. In this case as well, it is the same that the protruding portion acts as an intermediate grounding portion and realizes stabilization of the ground potential.

Next, a method for connecting the coaxial cable harness 10 will be described.
First, all the plurality of coaxial cables 20 constituting the coaxial cable harness 10 and the insulated cable 12 are arranged in parallel and held by a jig or tape (not shown), and the ends of the plurality of coaxial cables 20 are led out. Process (salting step). This lead-out process is performed using a laser processing machine such as a YAG laser or a CO ₂ laser. First, the outer sheath 24 of the plurality of coaxial cables 20 is cut by adjusting the wavelength and intensity of the CO ₂ laser, and ends thereof Pull out the side to remove. Next, the outer conductor 23 of the plurality of coaxial cables 20 is cut by adjusting the wavelength and intensity of the YAG laser, and the outer conductor on the end side is pulled out and removed. Thereafter, the wavelength and intensity of the CO ₂ laser are adjusted, the internal insulators 22 of the plurality of coaxial cables 20 are cut, and the internal insulators on the end side are pulled out and removed.

  Then, after performing the lead-out process, the outer conductors 23 of all the coaxial cables 20 are sandwiched and held between the ground bars 14 and 15. At this time, the coaxial cable 20 is not disposed on the projecting portion 13 of the ground bar 14, and the projecting portion 13 and the central conductor 21 of the coaxial cable 20 are disposed in parallel as seen from above as shown in FIG. The height of the protrusion 13 and the center conductor 21 may be shifted. Here, each of the ground bars 14 and 15 is provided with a solder layer formed by applying solder on one surface, and when the external conductor 23 is sandwiched, the solder layer side is disposed inside. . In this state, heating is performed through the ground bars 14 and 15. Then, the solder layers of the ground bars 14 and 15 are melted, and the outer conductors 23 of all the coaxial cables 20 are conductively connected to the ground bars 14 and 15.

In this way, the coaxial cable harness 10 whose ends are assembled and integrated is connected to the connected member 11 such as a connector terminal or a board such as an FPC as described above.
When connecting to the member 11 to be connected, which is a substrate, first, the end grounding portions 18 located at both ends of the ground bars 14 and 15 are respectively soldered and electrically connected to the grounding terminal 17c.

Then, the central conductor 21 with respect to the connection terminal 17 and the projecting portion 13 with respect to the intermediate ground connection terminal 17a are collectively soldered. First, as shown in FIG. 4, the connection facing portion between the central conductor 21 and the connection terminal 17 of the coaxial cable 20 and the connection facing portion between the protruding portion 13 of the ground bar 14 and the intermediate ground connection terminal 17a are linear (for example, And a plate solder S1 having a round bar shape having a diameter of 0.08 mm). At that time, it arrange | positions so that the recessed part 13a of the protrusion part 13 may face the to-be-connected member 11 and the connection terminal 17a for intermediate | middle grounding. Then, the heat chip 9 of the pulse heater is pressed from above the central conductor 21 and the protruding portion 13 and heated while being pressed toward the connection terminal 17 and the intermediate ground connection terminal 17a. As a result, heat is transferred to the sheet solder S1 through the central conductor 21 and the protruding portion 13, and the sheet solder S1 is melted and gathers near the central conductor 21 and the protruding portion 13 in the vicinity. At that time, the sheet solder S1 located between the protruding portion 13 and the intermediate ground connection terminal 17a enters the concave portion 13a of the protruding portion 13. Thereafter, when cooled, the central conductor 21 is firmly fixed to the connection terminal 17 and the protruding portion 13 is firmly fixed by the solder S to the connection terminal 17a for intermediate grounding as shown in FIG. The As shown in FIG. 4, the protrusion 13 is connected to two intermediate ground connection terminals 17a. The protrusion 13 may be connected to three or more intermediate ground connection terminals 17a.
The position of the protrusion 13 can be set to an arbitrary position in the coaxial cable 20 that is arranged in parallel. However, for the purpose of intermediate grounding, it is preferably provided in the central portion of the coaxial cables 20 in parallel. The intermediate ground connection terminal 17a can be the same as the connection terminal 17 to which the coaxial cable 20 is connected, and the parallel pitch thereof may be constant.

  At the time of the collective soldering, the intermediate portion of the protrusion 13 is deformed so that the tip thereof contacts the intermediate ground connection terminal 17a due to heat and pressing force by the heat chip 9. After the batch soldering, this deformed shape is maintained.

  In addition, if the pressure applied to the connecting terminals 17 to press the heat chip 9 of the pulse heater is too weak during batch soldering, the sheet solder S1 is not sufficiently melted and the central conductor 21 is not conductively connected or connected. However, the connection strength is insufficient. Therefore, from the viewpoint of the connection strength of the central conductor 21, it is preferable that the pressure applied to press the heat chip 9 is large. For example, when the applied pressure is 0.23 MPa, the central conductor 21 is not bonded at all. When the applied pressure is 1.38 MPa, the unmelted portion of the sheet solder S1 remains in some places. The soldering state (connected state) was reached.

  Here, the relationship between the pressure applied to the heat chip 9 and the connection strength of the protrusions is shown in FIG. When the applied pressure is increased, the connection strength of the projecting portion tends to decrease. When the applied pressure (1.83 MPa) or more for securing the connection strength of the center conductor 21 is exceeded, the connection between the projecting portion and the connection terminal is obvious. Since no solder layer was formed, the connection strength was 100 gf or less.

  However, in this embodiment, since the concave portion 13a is provided in the connection facing portion between the protruding portion 13 and the intermediate ground connection terminal 17a, the solder layer is formed in the concave portion 13a even if the applied pressure is increased to 1.83 MPa or more. Is reliably formed, and the connection strength between the protruding portion 13 and the intermediate ground connection terminal 17a is kept good. Accordingly, the solder is collectively connected by a strong pressing force of 1.83 MPa or more to obtain a stable conductive connection state between the central conductor 21 and the connection terminal 17 of the coaxial cable 20 and a stable grounding state at the protruding portion 13 of the ground bar 14. Can also be secured.

  Further, in the conventional connection structure, when the thickness of the protruding portion is larger than the diameter of the central conductor, there is no gap in which solder remains between the protruding portion and the connection terminal when pressed by a heat chip, and the connection strength is increased. It will drop significantly. Actually, considering that the central conductor 21 is pressed in the radial direction at the time of batch soldering and the twisted wire structure is somewhat broken, the height when the two strands 21a of the central conductor 21 are vertically overlapped (in the AWG 42) When the thickness of the protrusion 13 is equal to or greater than the strand diameter 0.025 mm × 2), the connection strength is remarkably reduced.

  On the other hand, in this embodiment, even if the thickness of the protruding portion 13 is larger than the diameter of two strands of the central conductor 21, the connection facing portion is provided with the concave portion 13a, so that sufficient connection is achieved. Strength can be secured. For example, when the coaxial cable 20 is an AWG 42 and the diameter of the central conductor 21 is 0.075 mm, the connection strength can be ensured without any problem even if the thickness of the protruding portion 13 is 0.080 mm. For example, when the coaxial cable 20 is an AWG 46 and the diameter of the central conductor 21 is 0.048 mm, the connection strength can be ensured without any problem even if the thickness of the protruding portion 13 is 0.050 mm.

  Further, the connection strength can be secured if the thickness (depth) of the recess 13a, that is, the thickness of the solder layer is at least 5 μm, usually about 10 to 20 μm. For example, as an example when the thickness of the protrusion 13 is 50 μm, the thickness of the recess 13 a is 25 μm. Further, from the viewpoint of the strength and moldability of the protrusion 13, the thickness of the recess 13 a is preferably 2/3 or less with respect to the thickness of the protrusion 13.

Moreover, as shown in FIG. 6, various forms can be employed for the recesses.
FIG. 6A is the same as the form shown in FIG. 3, and is an example in which a recess 13 a having a length of about ½ with respect to the connection length L <b> 1 of the protrusion 13 is formed. FIG. 6B is an example in which two concave portions 13 a are formed in the longitudinal direction of the protruding portion 13. FIG. 6C shows a configuration in which the protrusion 13 is not provided with a recess, and a recess 17b is provided on the connection-facing portion on the intermediate ground connection terminal 17a side. You may provide a recessed part in the both sides (the protrusion part 13 and the connection terminal 17a for intermediate grounding) of a connection opposing part.

  When providing the recessed part in the protrusion part 13, it is preferable that a recessed part occupies the area of about 3/10 to 7/10 of the area where the protrusion part 13 contacts the connection terminal 17a for intermediate grounding. It is preferable in terms of the strength of the protruding portion 13 to reduce the area of one recess. On the other hand, the larger the area of the recess, the larger the area on which the solder layer is formed, so that the protrusion 13 and the intermediate ground connection terminal 17a are firmly connected. Therefore, it is preferable to provide two or more recesses by reducing the area of one recess. The cross section of the concave portion may not be the rectangle shown in FIG. 6 but may have a shape (a shape obtained by dividing an ellipse into two or a triangular shape) that becomes narrower toward the top, for example. As shown in FIGS. 3 and 4, a recess may be provided in the middle of the protrusion 13 in the width direction. However, in order to facilitate forming the recess, a groove is cut from end to end in the width direction. Is good. For example, one groove having a width of 0.07 mm can be provided in the width direction of the protruding portion 13. In terms of reducing the area of one recess, it is more preferable to provide two recesses having a width of 0.04 mm in the width direction of the protrusion 13.

Moreover, the form of the protrusion part of a ground bar may change the width | variety as shown in FIG.
In the protruding portion 13A shown in FIG. 7, a narrow portion 13c having a width smaller than that of the terminal connecting portion 13d is formed between the terminal connecting portion 13d and the main body portion 16 which are conductively connected to the intermediate ground connecting terminal 17a. Is. The small width portion 13c is a portion that is deformed at the time of the collective soldering, and the residual stress generated in the protruding portion 13A after the collective soldering can be reduced by reducing the width of the deformed portion. If the residual stress is large, a force that causes the protruding portion 13A to return to the direction of peeling from the intermediate ground connection terminal 17a may act, causing the protrusion to peel from the intermediate ground connection terminal 17a. Therefore, by adopting the form shown in FIG. 7, the protruding portion 13A is peeled off from the intermediate ground connection terminal 17a in the initial state after batch soldering, or the protruding portion 13A is used for intermediate grounding due to vibration after mounting. It is possible to prevent peeling from the connection terminal 17a.
The width of the small width portion 13c is not less than the plate thickness of the protruding portion 13A and not more than 5/6 with respect to the width of the terminal connecting portion 13d from the point of handling the ground bar and preventing the peeling of the protruding portion. It is desirable that

Further, the form of the protruding portion of the ground bar may be a width connected to only one intermediate ground connection terminal as shown in FIG.
The projecting portion 13B shown in FIG. 8A extends in a single width and is connected to only one intermediate ground connection terminal 17a. Further, the protruding portion 13C shown in FIG. 8B has a configuration in which the terminal connecting portion 13d having the small width portion 13c and wider than the small width portion 13c is connected to only one intermediate ground connection terminal 17a. . When the parallel pitch of the connection terminal 17 and the intermediate ground connection terminal 17a is 1 mm, the width of the intermediate ground connection terminal 17a is about 0.5 mm. About 15 mm, the width of the terminal connecting portion 13 d can be about 0.25 mm.

  7 and 8 also, the connection facing portion between the protrusion and the intermediate ground connection terminal is provided with a recess in at least one of the protrusion and the intermediate ground connection terminal. The connection strength of the part is sufficiently secured.

It is a top view which shows the example of embodiment of the connection structure of the coaxial cable harness of this invention. It is sectional drawing of the coaxial cable used for the coaxial cable harness of FIG. It is sectional drawing of FIG. 1 which shows a coaxial cable harness. It is sectional drawing which shows the example of embodiment of the connection method of the coaxial cable harness of this invention. It is a graph which shows the relationship between the applied pressure and connection strength in the conventional connection structure. It is the schematic which shows the form example of a recessed part. It is a top view which shows the protrusion part which has a small width part. It is a top view which shows the protrusion part connected to one connection terminal. It is a top view which shows the connection structure of the conventional coaxial cable harness. It is sectional drawing which shows the connection structure of the coaxial cable harness of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Coaxial cable harness 11 Connected member 13,13A, 13B, 13C Protrusion part 13a Recess 13b Side surface 13c Narrow part 13d Terminal connection part 14,15 Ground bar 16 Main part 18 End part grounding part 17 Connection terminal 17a Connection for intermediate grounding Terminal 17b Recess 20 Coaxial cable 21 Center conductor 22 Internal insulator 23 External conductor 24 Outer sheath S Solder S1 Plate solder

Claims (5)

A plurality of coaxial cables having a center conductor, an inner insulator disposed on the outer periphery of the center conductor, an outer conductor disposed on the outer periphery of the inner insulator, and a jacket disposed on the outer periphery of the outer conductor Are arranged in parallel, and at the end of each coaxial cable, the central conductor is conductively connected by soldering to a connection terminal arranged in parallel,
The outer conductors of the plurality of coaxial cables are conductively connected to a common ground bar;
The ground bar is arranged in parallel with the connection terminal extending from the main body at a portion other than the end grounding portion at the end grounding portions at both ends of the main body extending in the parallel direction of the coaxial cable. A projecting portion that is conductively connected to the intermediate ground connection terminal by soldering;
A coaxial portion, wherein a concave portion is formed in at least one of the projecting portion and the intermediate ground connection terminal at a connection facing portion between the projecting portion and the intermediate ground connection terminal, and solder is provided in the concave portion. Cable harness connection structure. The coaxial cable harness connection structure according to claim 1,
The projecting portion has a coaxial portion characterized in that a narrow portion having a width smaller than that of the terminal connection portion is formed between a terminal connection portion conductively connected to the intermediate ground connection terminal and the main body portion. Cable harness connection structure. The connection structure of the coaxial cable harness according to claim 1 or 2,
A connection structure for a coaxial cable harness, wherein the ground bar is plated after molding. A plurality of coaxial cables having a center conductor, an inner insulator disposed on the outer periphery of the center conductor, an outer conductor disposed on the outer periphery of the inner insulator, and a jacket disposed on the outer periphery of the outer conductor Placed in parallel,
The end portion of the coaxial cable is exposed so that the outer conductor, the inner insulator, and the central conductor are exposed stepwise,
The ground bar having a ground bar having an end grounding portion at both ends of the main body portion extending in the parallel direction of the coaxial cable and a projecting portion extending from the main body portion at a place other than the end grounding portion, Conductive connection to the outer conductor of the coaxial cable,
A method for connecting a coaxial cable harness, wherein the central conductor and the protruding portion are conductively connected by batch soldering to a plurality of connection terminals and a connection terminal for intermediate grounding provided in parallel,
During the batch soldering, a recess formed in at least one of the projecting portion and the intermediate ground connection terminal is disposed in a connection facing portion of the projecting portion and the intermediate ground connection terminal, and soldered to the recess. A method of connecting a coaxial cable harness, wherein the protruding portion and the intermediate ground connection terminal are soldered. It is a connection method of the coaxial cable harness according to claim 4,
A method for connecting coaxial cable harnesses, wherein a pressure applied to the intermediate ground connection terminal during the batch soldering is 1.83 MPa or more.

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