JP5224793B2 - Harness processing method - Google Patents

Description

  The present invention relates to terminal processing of a flat multicore coaxial harness.

  In recent years, electronic devices typified by mobile phones have been rapidly reduced in size, weight and functionality. As a result, the flat multi-core coaxial harness used for the internal wiring is also reduced in size at the coupling portion with the substrate, the diameter of the coaxial cable is reduced, and the pitch between the cables is also reduced. Recently, the product cycle has become shorter year by year, and improvement in productivity has been demanded.

  FIG. 5 is a perspective view showing a terminal portion of a conventional general flat multi-core coaxial harness. As shown in FIG. 5, in a flat multi-core coaxial harness (hereinafter, appropriately referred to as a harness) 100, a plurality of coaxial cables (hereinafter, appropriately referred to as cables) 1 are arranged in parallel at an equal pitch and temporarily fixed with a plastic tape 2. Thereafter, the cable lead-out process is performed, and the terminal is processed in a lump by soldering the external conductor 6 partially exposed in each cable 1 between the two metal plates 3 and soldering together. Thereafter, the central conductor 4 of the harness 100 is soldered to a connection terminal such as an FPC, a board, or a connector. In addition, cable lead-out processing means removing each insulator covering the cable at the tip portion of the cable and exposing part of the center conductor 4 and the outer conductor 6.

  FIG. 6 is a front view showing an arrangement when external conductors are collectively soldered with a metal plate, (a) is a front view showing a state before soldering, and (b) is a front view showing a state after soldering. It is. Here, FIGS. 6A and 6B correspond to views as seen from the direction of arrow A shown in FIG. Further, the coaxial cable 1 is coated with an inner insulator 5 around a central conductor 4, an outer conductor 6 in which a plurality of conductors are twisted is coated on the outer side, and an outer insulator 7 called a jacket on the outer side. It has a covered structure.

  As shown in FIG. 6 (a), each metal plate 3 has a solder plate 8 set inside thereof and is arranged vertically with the external conductor 6 interposed therebetween. In this state, by pressing with a heating head (not shown) in the direction of the arrow, as shown in FIG. 6B, the space between the two metal plates 3 and the external conductor 6 is filled with solder 8a, and each cable 1 The partially exposed outer conductor 6 is collectively soldered by the two metal plates 3.

As a conventional technique related to the terminal processing of such a flat multi-core coaxial harness, the outer conductor on the end side is further removed from the metal plate, and the exposed insulating core is fixed at a predetermined pitch with a plastic tape. There has been proposed a processed wire product in which the central conductor is exposed by shifting the insulation in the peeling direction (see Patent Document 1).
Japanese Patent Laid-Open No. 10-144145

  In the conventional terminal processing, when the outer conductors 6 of the cables 1 are soldered together with the metal plate 3, a jig having a plurality of positioning pins arranged in a comb shape is used to make the cables 1 have an equal pitch. The center conductor 4 is inserted between the positioning pins, or the outer conductor 6 of the cable 1 is placed on the metal plate 3, and then the pitch is manually adjusted. However, in the pitch adjustment using the jig as described above, the center conductor 4 may be damaged when the center conductor 4 is inserted between the positioning pins. In addition, manual pitch adjustment takes time. In addition, the cable itself becomes soft due to the reduction in the diameter of the cable, and when the external conductor 6 is collectively soldered with the metal plate 3, the cable 1 may move to the left and right due to the force of the solder 8a flowing. If the cable 1 moves in this way, then it is necessary to adjust the pitch in the connecting process with the FPC, the substrate, etc., and the work takes time. Further, since the heating press by the heating head is performed from the upper side to the lower side, there is a problem that it takes time for the heat from the upper metal plate 3 to be transmitted to the lower metal plate 3. In addition, when the internal insulator 5 is pressed more than necessary during the heating press by the heating head, the internal insulator 5 may be crushed, resulting in insulation failure between the external conductor 6 and the central conductor 4.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a metal plate for a harness terminal and a harness processing method capable of efficiently performing terminal processing without applying a load to the cable. There is to do.

In order to achieve the above object, the invention according to claim 1 is directed to a flat multi-core coaxial harness terminal in which a plurality of coaxial cables are arranged in parallel at equal intervals. A harness processing method using a metal plate for a harness terminal for batch soldering, wherein the metal plate for a harness terminal is arranged in the same manner as the coaxial cable in a groove section having a square cross section along the longitudinal direction of a metal plate serving as a substrate A plurality of grooves are formed at intervals, the groove width W of the groove portion is D + α (D: outer diameter of the outer conductor, α: outer diameter tolerance of the outer conductor), and the groove depth d is 0.5D to 1.5D, It is configured so that the partially exposed outer conductor of each coaxial cable is accommodated in the groove portion ,
Storing a partially exposed outer conductor of each coaxial cable of the flat multicore coaxial harness in the groove of the harness terminal metal plate; and
A step of arranging a flat metal plate via a solder plate at a position facing the harness terminal metal plate with the outer conductor interposed therebetween;
The external conductor partially exposed of each coaxial cable is made to be used for the flat metal plate and the harness terminal by being heated and pressed by a heating means from the flat metal plate side to the harness terminal metal plate side. A process of batch soldering with a metal plate;
The gist is to provide.

  The gist of the invention according to claim 2 is that, in claim 1, the depth d of the groove is 0.95D to 1.05D.

  The gist of the invention according to claim 3 is that, in claim 1 or 2, the bottom surface shape of the groove is semicircular.

  According to the present invention, the harness terminal metal plate is formed with a groove having a square cross section at the same arrangement interval as the coaxial cable. Therefore, as in the case of using the jig provided with the positioning pin described above, The outer conductor can be accommodated in the groove without damaging the central conductor. In addition, since the groove functions as a guide groove for the external conductor, manual pitch adjustment is not necessary, and the work time when the external conductor is set on the harness terminal metal plate can be shortened. Further, since the outer conductor housed in the groove is restricted from moving in the lateral direction, the cable does not move from side to side due to the force of the molten solder flowing during the hot pressing. For this reason, it is not necessary to adjust the pitch in the connecting step with the FPC, the substrate, etc., and it is possible to prevent the working time from increasing.

  Further, since the distance from the opposing flat metal plate is reduced by the groove depth d of the metal plate for harness terminal, the heat when heated by the heating head is for the lower harness terminal from the upper flat metal plate. It becomes easy to be transmitted to the metal plate, and the heating time can be shortened. In particular, by setting the groove depth d to be larger than the outer diameter D of the outer conductor, the harness terminal metal plate and the flat metal plate are in direct contact with each other. As a result, heat can be easily transmitted, and the heating time can be further shortened.

  Further, since there are a plurality of grooves between the harness terminal metal plate and the flat metal plate, the amount of solder can be reduced by the volume of the groove. Accordingly, the solder plate can be made only on one side, the time for setting the solder plate can be reduced by half, and the cost can be reduced.

  Furthermore, by setting the groove depth d in the range of 0.5D to 1.5D, it is possible to prevent the external conductor 6 from being unnecessarily pressured at the time of heat pressing by the heating head. It is possible to prevent an insulation failure from occurring between the outer conductor and the center conductor. In particular, when the groove depth d is in the range of 0.95D to 1.05D, even if there is a variation in the outer diameter tolerance α of the outer conductor, the outer conductor is excessively pressed against each metal plate during heating press, Since there is no shortage of pressing, stable soldering can always be performed.

  Hereinafter, embodiments of a metal plate for a harness terminal and a harness processing method according to the present invention will be described. In addition, each figure referred in description of embodiment shows the structure of the metal plate for harness terminals concerning this embodiment typically, and the dimension of each part, its ratio, etc. differ from an actual thing. In addition, in order to make it easy to grasp the structure of the characteristic part of the invention, there are parts in which the shapes, lengths, thicknesses, etc. in the drawings are not necessarily similar, and there are cases where the dimensions and ratios of enlargement / reduction are different. .

  Moreover, in this embodiment, the same code | symbol as FIG. 6 demonstrated previously is used for a coaxial cable. That is, the coaxial cable 1 is coated with an inner insulator 5 around a central conductor 4, an outer conductor 6 in which a plurality of conductors are twisted is coated on the outer side, and an outer insulator 7 called a jacket on the outer side. It is covered.

  FIG. 1 is an external view of a metal plate for a harness terminal (hereinafter referred to as a grooved metal plate) according to the present embodiment, (a) is a plan view of the grooved metal plate, and (b) is a grooved metal plate. It is a front view. The grooved metal plate 10 of the present embodiment has a strip-shaped metal plate 11 as a substrate, and grooves 12 having a square cross section are formed along the longitudinal direction of the metal plate 11 at the same arrangement interval (pitch p) as the cable 1. Yes. As shown in FIG. 1B, a gap 12 is formed between adjacent partition walls 13 formed on the surface of the metal plate 11. Each groove portion 12 is set so that the groove width W becomes D + α when the outer diameter of the outer conductor 6 of the cable 1 is D and the outer diameter tolerance of the outer conductor 6 is α. The outer diameter D of the outer conductor 6 means not the outer diameter of each twisted conductor, but the outer diameter in a state where the outer conductor 6 is covered on the outer side. Further, the groove depth d is set in the range of 0.5D to 1.5D, preferably in the range of 0.95D to 1.05D. On the other hand, the flat metal plate 15 disposed opposite to the grooved metal plate 10 and the external conductor 6 is the same as the metal plate 3 shown in FIG.

  Next, a harness processing method using the grooved metal plate 10 will be described with reference to FIG. FIG. 2 is a front view showing an arrangement when the outer conductors are collectively soldered with a grooved metal plate and a flat metal plate, (a) is a front view showing a state before soldering, and (b) is after soldering. It is a front view which shows the state. Here, FIGS. 2A and 2B correspond to views as seen from an arrow A shown in FIG.

  First, as shown in FIG. 2A, the partially exposed outer conductor 6 of each cable 1 is accommodated in the groove portion 12 of the grooved metal plate 10. Next, the solder plate 14 is set on the upper portion of the outer conductor 6, and the flat metal plate 15 is disposed via the solder plate 14 at a position facing the grooved metal plate 10 with the outer conductor 6 interposed therebetween. Next, it heat-presses in the direction of an arrow with the heating head (heating means) which is not illustrated toward the metal plate 10 side with a groove | channel from the flat metal plate 15 side. As a result, as shown in FIG. 2B, the gap between the grooved metal plate 10 and the flat plate metal plate 15 is filled with the solder 14a of the melted solder plate 14, and a part of each cable 1 is exposed. The conductor 6 is collectively soldered between the grooved metal plate 10 and the flat metal plate 15.

  According to the present embodiment, since the groove portion 12 having a quadrangular cross section is formed on the grooved metal plate 10 so as to coincide with the pitch p of the arrangement of the cables 1, the jig provided with the positioning pins described above is used. The outer conductor 6 can be accommodated in the groove portion 12 without damaging the central conductor 4 of the cable 1 as in the case of the case. In addition, since the groove portion 12 functions as a guide groove for the external conductor 6, manual pitch adjustment is unnecessary, and the work time when the external conductor 6 is set on the grooved metal plate 10 can be shortened. Further, since the outer conductor 6 housed in the groove 12 is restricted from moving in the lateral direction, the cable 1 does not move left and right due to the force of the solder 14a melted during the hot pressing. For this reason, it is not necessary to adjust the pitch in the connecting process with the FPC, the substrate, etc., and an increase in working time can be prevented.

  Further, since the distance from the flat plate metal plate 15 is reduced by the height of the partition wall 13 of the grooved metal plate 10 (the depth of the groove portion 12), the heat generated by the heating press by the heating head is increased by the upper flat plate metal. It becomes easy to be transmitted from the plate 15 to the lower grooved metal plate 10, and the heating time can be shortened. In particular, since the grooved metal plate 10 and the flat metal plate 15 are in direct contact with each other by making the groove depth d larger than the outer diameter D of the outer conductor 6, the flat metal plate 15 and the grooved metal plate are brought into contact with each other. Heat can be more easily transferred to the side 10 and the heating time can be further shortened.

  Further, since there are a plurality of partition walls 13 of the grooved metal plate 10 between the grooved metal plate 10 and the flat metal plate 15, the amount of solder is reduced by the volume of the partition wall 13. be able to. Accordingly, it is possible to make the solder plate 14 only on one side, so that the time for setting the solder plate 14 can be reduced to half and the cost can be reduced.

  Furthermore, by setting the groove depth d in the range of 0.5D to 1.5D, it is possible to prevent the external conductor 6 from being unnecessarily pressured during the heating press by the heating head. Insulation failure can be prevented between the outer conductor 6 and the center conductor 4. In particular, when the groove depth d is in the range of 0.95D to 1.05D, even if the outer diameter tolerance α of the outer conductor 6 varies, the outer conductor 6 is pressed too much against each metal plate during the heating press. Therefore, stable soldering can always be performed.

  As described above, according to the grooved metal plate and the harness processing method according to the present embodiment, it is possible to efficiently perform terminal processing without applying a load to the cable.

  Next, another embodiment of the grooved metal plate will be described. In the above embodiment, as shown in FIG. 1, the shape of the groove 12 is a square cross section, but as shown in FIG. 3, the bottom shape of the groove 12 may be a semicircle. In the grooved metal plate 10 </ b> A shown in FIG. 3, the bottom shape of the groove 12 is a semicircular shape, so that the outer conductor 6 can be accommodated better. Further, since the area where the outer conductor 6 is in contact with the bottom surface portion of the groove 12 is increased during hot pressing, the outer conductor 6 can be prevented from being partially crushed.

  Moreover, as shown in FIG. 4, it is good also considering the bottom face shape of the groove part 12 as a triangle. In the grooved metal plate 10B shown in FIG. 4, since the bottom surface shape of the groove portion 12 is triangular, the outer conductor 6 can be easily accommodated in the groove portion 12, and the work when the outer conductor 6 is set on the grooved metal plate 10B. Time can be further shortened.

  Although the outline of the present invention has been described by using the above-described embodiments, the description and drawings that form a part of this disclosure do not limit the technical scope of the present invention, and various alternative embodiments can be derived from this disclosure. Is recalled.

  For example, in each of the above embodiments, an example in which a flat metal plate is arranged on the upper side and a grooved metal plate is arranged on the lower side is shown. However, a grooved metal plate is arranged on the upper side, and a flat metal plate is arranged on the lower side. An arrangement may be adopted. Furthermore, a solder paste may be used instead of the solder plate.

  As described above, it is needless to say that the present invention includes various embodiments not described herein. Therefore, the technical scope of the present invention is determined only by the invention specifying matters according to the scope of claims reasonable from the above description.

The external view of the metal plate with a groove | channel concerning embodiment. (A) is a top view of a grooved metal plate. (B) is a front view of a grooved metal plate. The front view which shows arrangement | positioning at the time of lump soldering an external conductor with a grooved metal plate and a flat metal plate. (A) is a front view which shows the state before soldering. (B) is a front view showing a state after soldering. The front view of the metal plate with a groove | channel which made the bottom face shape of the groove part the semicircle. The front view of the grooved metal plate which made the bottom face shape of the groove part the triangle. The perspective view which shows the terminal part of the conventional common flat multi-core coaxial harness. The front view which shows arrangement | positioning at the time of lump soldering an external conductor with a metal plate in a prior art example. (A) is a front view which shows the state before soldering. (B) is a front view showing a state after soldering.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Coaxial cable 4 ... Center conductor 5 ... Internal insulator 6 ... External conductor 7 ... External insulator 10, 10A, 10B ... Metal plate with a groove | channel (metal plate for harness terminals)
DESCRIPTION OF SYMBOLS 11 ... Metal plate 12 ... Groove part 13 ... Partition wall 14 ... Solder plate 14a ... Solder 15 ... Flat plate metal plate

Claims (3)

Harness processing using a metal plate for a harness terminal for collectively soldering the partially exposed outer conductor of each coaxial cable in a terminal of a flat multi-core coaxial harness in which a plurality of coaxial cables are arranged in parallel at equal intervals A method,
The harness terminal metal plate is:
A plurality of grooves having a square cross section along the longitudinal direction of the metal plate to be a substrate are formed at the same arrangement interval as the coaxial cable,
The groove width W of the groove portion is D + α (D: outer diameter of the outer conductor, α: outer diameter tolerance of the outer conductor), and the groove depth d is 0.5D to 1.5D,
The groove portion is configured to accommodate a partially exposed outer conductor of each coaxial cable,
Storing a partially exposed outer conductor of each coaxial cable of the flat multicore coaxial harness in the groove of the harness terminal metal plate; and
A step of arranging a flat metal plate via a solder plate at a position facing the harness terminal metal plate with the outer conductor interposed therebetween;
The external conductor partially exposed of each coaxial cable is made to be used for the flat metal plate and the harness terminal by being heated and pressed by a heating means from the flat metal plate side to the harness terminal metal plate side. A process of batch soldering with a metal plate;
A harness processing method comprising: The harness processing method according to claim 1, wherein a depth d of the groove is 0.95D to 1.05D. The harness processing method according to claim 1, wherein a bottom shape of the groove is a semicircular shape.

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