JP6381439B2 - Cable connection structure - Google Patents

Description

The present invention relates to a cable connection structure in which a pad of a wiring board and a core wire of a cable are electrically connected by a soldering terminal connected to the core wire of a cable formed by insulating coating the core wire.

The electrical connection of the cable to the wiring board is generally performed by a soldering method in which the core wire of the cable is soldered onto the pad of the wiring board.
For example, as described in Patent Document 1, a method of exposing a core wire at an end of a cable and directly soldering the exposed core wire and a pad of a wiring board is widely used.
Moreover, as described in Patent Document 2, a configuration in which a crimp terminal is connected to a core wire at the end of a cable and connected to a wiring board (printed wiring board) via the crimp terminal is also known. In this Patent Document 2, the crimp terminal is provided in a substantially ten-letter shape, and has a crimp part that connects the cable core wire at the head, and a pin that is inserted into the through hole of the wiring board at the lower part. The pin is inserted into a through hole of the wiring board and soldered, so that the cable is connected to the wiring board through the crimp terminal.

JP 2013-251223 A Japanese Patent Laid-Open No. 7-212003

  By the way, in recent years, the high integration of wiring boards has been accelerated, and accordingly, the miniaturization of pads and the thinning of cables have been accelerated. Moreover, it is required to shorten the dimension of the exposed portion of the core wire formed by cutting off the outer skin at the end of the cable to about several mm. For this reason, the operation of connecting the core wire of the cable to the pad of the wiring board is more difficult, and as represented by Patent Document 1, the configuration of directly connecting the core wire of the cable and the pad of the wiring board. In this case, the core wire tends to be lifted from the pad, which may cause poor bonding.

In addition, in order to give flexibility to the cable itself, each thin wire forming the core of the stranded wire is made extremely thin, but by thinning the thin wire, each thin wire is used when soldering. It becomes difficult to connect the cable without causing the core wire or solder to protrude from a narrow area of the pad surface, and the work becomes complicated. In addition, after soldering, each thin wire is fixed by the solder, so when the outer skin is cut to expose the core wire of the cable, from the portion due to factors such as minute damage to the core wire It becomes easy to be cut.
In addition, when soldering by inserting a crimp terminal as described in Patent Document 2 into a through hole, it is necessary to secure a wide space not only on the front side of the wiring board but also on the back side. Therefore, it is disadvantageous in terms of high integration.

The present invention has been made in view of such circumstances, it is possible to improve the workability of soldering of the core wire and the pad, it is possible to prevent the occurrence of bonding failures Luque Buru connecting structure The purpose is to provide.

The cable connection structure of the present invention includes a soldering terminal having a crimping portion connected to an exposed portion of a core wire exposed at an end portion of the cable, and a connection portion protruding from the crimping portion, and an end portion of the cable When the connection portion of the soldering terminal connected to the crimping portion is soldered to the surface of the pad of the wiring board, protrudes from the outer peripheral surface of the crimping portion, and the connection portion is installed on the pad In addition, an installation leg is provided that contacts a position different from the pad of the wiring board.

The soldered terminal crimping part is connected to the exposed part of the core wire, and the connecting part protruding from the crimping part is placed on the surface of the pad and soldered, preventing adhesion of solder to the root of the exposed part of the core wire Therefore, disconnection of the core wire is difficult to occur. In addition, since the exposed portion of the core wire is held together by the crimping portion, there is no spread of each thin wire constituting the core wire, and electrical connection to a high-density wiring board is easily performed via the connection portion. be able to.
Further, when the connection surface of the connection portion is brought into contact with the pad, the installation leg portion that comes into contact with the wiring substrate is provided, so that the wiring substrate and the cable are easily held in parallel.
Therefore, workability at the time of soldering between the core wire of the cable and the pad of the wiring board can be improved, and occurrence of poor bonding can be prevented.

  ADVANTAGE OF THE INVENTION According to this invention, workability | operativity at the time of soldering with a core wire and a pad can be improved, and generation | occurrence | production of a joining defect can be prevented.

It is a figure which shows the terminal for soldering and cable connection structure of 1st Embodiment of this invention, (a) is a perspective view, (b) is a side view. It is a side view of the terminal for soldering and cable connection structure explaining a 2nd embodiment of the present invention. It is a perspective view which shows the terminal for soldering and cable connection structure of 3rd Embodiment of this invention. It is a side view of the terminal for soldering and cable connection structure explaining a 4th embodiment of the present invention. It is a side view of the terminal for soldering and cable connection structure explaining a 5th embodiment of the present invention.

Hereinafter, embodiments of a soldering terminal and a cable connection structure according to the present invention will be described with reference to the drawings.
A cable connection structure 100 according to the first embodiment of the present invention shown in FIG. 1 includes a wiring board 20 including a cable 10 in which the outer side of a core wire 11 is covered with an outer sheath 12 and a pad 21 formed as a terminal portion of a circuit conductor. And a soldering terminal 30A for connecting between the core wire 11 of the cable 10 and the pad 21 of the wiring board 20, and the cable 10 and the wiring board 20 are electrically connected via the soldering terminal 30A. It is what is done.

  Note that, as described above, the cable 10 is obtained by covering the core wire 11 with the outer sheath 12 having an insulating property, and the core wire 11 of the cable 10 is constituted by a stranded wire obtained by bundling a plurality of thin wires. And the exposed part 11a which exposed the inner core wire 11 is formed by excising the outer skin 12 in the edge part of the cable 10. FIG.

The soldering terminal 30A is formed of a metal member such as brass, beryllium copper, or phosphor bronze that has excellent conductivity and solderability, and is a crimping portion that is connected to the exposed portion 11a of the core wire 11 exposed at the end of the cable 10. 31 and a connecting portion 32 protruding from the crimping portion 31.
The crimping part 31 is a part connected to the cable 10 and holds the cable 10 by crimping the exposed part 11a of the core wire 11 by a pair of crimping pieces 31a as shown in FIG. , Electrically connected to the cable 10. The connection portion 32 is a portion to be soldered to the surface of the pad 21 of the wiring board 20 and is provided in a predetermined shape according to the size of the pad 21.

In the soldering terminal 30 </ b> A of the present embodiment shown in FIG. 1, the connection portion 32 is provided in a rectangular plate shape, and a connection surface 32 s along the surface of the pad 21 of the wiring board 20 is formed as a plane.
Further, the crimping part 31 and the connection part 32 are connected via a step part 33, and the lower surface of the crimping part 31 and the connection surface 32 s of the connection part 32 are shifted by the step part 33. Arranged almost in parallel. Thereby, when the connection surface 32s of the connection part 32 is installed on the surface of the pad 21, the crimp part 31 is disposed at a position higher than the position of the connection surface 32s, and is disposed at a position separated from the wiring board 20. The

Next, a procedure for soldering the cable 10 and the wiring board 20 will be described.
First, the outer skin 12 at the end of the cable 10 is cut to a predetermined length to expose the core wire 11 to form an exposed portion 11a. Then, the cable 10 and the soldering terminal 30A are connected by crimping the exposed part 11a of the core wire 11 to the crimping part 31 of the soldering terminal 30A. At this time, the end of the crimping piece 31a is crimped in an R shape (referred to as a bell mouth) so that the exposed portion 11a of the core wire 11 is not damaged.
Next, the connection surface 32 s of the connection part 32 of the soldering terminal 30 </ b> A is disposed so as to overlap the surface of the pad 21 of the wiring board 20, the connection part 32 and the pad 21 are soldered, and the connection part 32 is connected to the pad 21. The surface is fixed with solder 40. In this way, the cable connection structure 100 in which the cable 10 and the wiring board 20 are electrically connected via the soldering terminal 30A is completed.

Thus, in the cable connection structure 100, the cable 10 and the wiring board 20 are connected via the soldering terminal 30A. More specifically, the crimping part 31 of the soldering terminal 30A is connected to the exposed part 11a of the core wire 11, and the connection part 32 protruding from the crimping part 31 is arranged on the surface of the pad 21 of the wiring board 20 and soldered. By doing so, the cable 10 and the wiring board 20 are electrically connected.
In this soldering, since the connecting portion 32 protruding from the crimping portion 31 is soldered, the solder 40 adheres to the root of the core wire 11 of the cable 10 (the root of the exposed portion 11a). Can be prevented. Furthermore, in the soldering terminal 30A of the present embodiment, the crimp portion 31 is disposed at a position higher than the connection surface 32s of the connection portion 32, and solder to the base of the exposed portion 11a when the connection portion 32 is soldered. The effect of preventing the adhesion of 40 is further enhanced. For this reason, disconnection of the core wire 11 and the like due to solder adhesion to the base of the exposed portion 11a can be prevented.

  Further, the exposed portion 11a of the core wire 11 is held together by the crimping portion 31 of the soldering terminal 30A, so that the wire constituting the core wire 11 does not spread during the soldering operation and corresponds to the shape of the pad 21. By soldering the connected portion 32, electrical connection to the wiring board 20 having a high density can be easily performed. Moreover, since the connection surface 32s of the connection part 32 is formed with a flat surface, when connecting the connection surface 32s on the surface of the pad 21, it can be arrange | positioned in the stable state. Further, when the connection portion 32 is soldered to the surface of the pad 21, the solder 40 wets and spreads on the surface of the pad 21 and enters and is fixed between the lower surface of the crimping portion 31 and the pad 21. For this reason, it is possible to prevent the posture from falling due to the soldering terminal 30 </ b> A rolling or the like, improving workability and improving the mounting strength.

  As described above, in the soldering terminal 30A and the cable connection structure 100 according to the present embodiment, the workability at the time of soldering between the core wire 11 of the cable 10 and the pad 21 of the wiring board 20 can be improved. Can be prevented from occurring due to, for example, adhering to the base of the exposed portion 11 a of the core wire 11.

  2 to 4 show a soldering terminal and a cable connection structure according to another embodiment of the present invention. In these embodiments, the same components as those in the first embodiment are used as the wiring board and the like, and thus the description thereof is omitted. In each drawing, the same reference numerals are given to the common elements in the first embodiment. Therefore, the description is omitted.

The soldering terminal 30B of the second embodiment shown in FIG. 2 protrudes from the outer peripheral surface 31s of the crimping part 31 and is placed in contact with the wiring board 20 when the connecting surface 32s of the connecting part 32 is placed on the pad 21. Legs 34 are provided. In this case, when the connection surface 32 s of the connection portion 32 is brought into contact with the pad 21 during the soldering operation, the installation leg portion 34 comes into contact with the wiring substrate 20, so that the wiring substrate 20 and the cable 10 are held in parallel. It becomes easy and the workability | operativity of soldering can be improved.
In this soldering terminal 30 </ b> B as well, the crimp portion 31 is disposed at a position higher than the connection surface 32 s of the connection portion 32, so that it is possible to reliably prevent the solder 40 from adhering to the core wire 11. Therefore, also in the cable connection structure 200 of the second embodiment, workability at the time of soldering between the core wire 11 of the cable 10 and the pad 21 of the wiring board 20 can be improved, and occurrence of poor bonding can be prevented.

  In addition, in the soldering terminal 30A of the first embodiment and the soldering terminal 30B of the second embodiment, as shown in FIG. 1 or 2, the connection portion 32 is provided in a rectangular plate shape. The shape of the connection part 32 is not limited to this, and can be formed by other shapes. For example, like the soldering terminal 30 </ b> C of the third embodiment shown in FIG. 3, the connecting portion 32 can be bent into a cylindrical shape and rounded. In this soldering terminal 30 </ b> C, the mechanical strength can be increased by rounding the connection portion 32. Even in this case, it is desirable to form the connection portion 32 in consideration of the shape of the pad 21 to be soldered.

Further, in the soldering terminals 30A to 30C of the above embodiment, the crimp portion 31 is disposed at a position higher than the connection surface 32s of the connection portion 32, but for soldering of the fourth embodiment shown in FIG. Like the terminal 30D, it is possible to form a flat shape without forming a step shape between the crimping portion 31 and the connection portion 32.
Furthermore, like the soldering terminal 30E of the fifth embodiment shown in FIG. 5, in addition to the crimping part 31 that is crimped to the exposed part 11a of the core wire 11 of the cable 10, a holding part 35 that is crimped to the outer skin 12 is provided. It can also be set as the structure which has.

In addition, this invention is not limited to the thing of the structure of the said embodiment, In a detailed structure, it is possible to add a various change in the range which does not deviate from the meaning of this invention.
For example, in the above-described embodiment, the soldering terminals 30A to 30E are flat on the connection surface 32s of the connection portion 32, but also include shapes such as a cylindrical surface.

DESCRIPTION OF SYMBOLS 10 Cable 11 Core wire 11a Exposed part 12 Outer skin 20 Wiring board 21 Pad 30A-30E Soldering terminal 31 Crimp part 31a Crimp piece 31s Outer peripheral surface 32 Connection part 32s Connection surface 33 Step part 34 Installation leg part 35 Holding part 40 Solder 100- 500 Cable connection structure

Claims (1)

A soldering terminal having a crimping portion connected to the exposed portion of the core wire exposed at the end of the cable, and a connection portion protruding from the crimping portion;
The connecting portion of the soldering terminal in which an end portion of the cable is connected to the crimping portion,
Soldered to the surface of the wiring board pad,
A cable connection structure provided with an installation leg portion that protrudes from an outer peripheral surface of the crimping portion and abuts at a position different from the pad of the wiring board when the connection portion is installed on the pad.

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