JP4871795B2 - Coaxial cable soldering method and coaxial cable assembly - Google Patents

Description

  The present invention is a method for soldering a coaxial cable that prevents a problem of sucking up a solder that occurs in a process of soldering a GND bar when a coaxial cable used for high-speed transmission is processed for a connector, and is manufactured using the method. Coaxial cable assembly.

Patent document 1 is mentioned as a prior art regarding a shield connector.
In Patent Document 1, a shield layer exposed at a terminal portion of a shielded electric wire is covered and fixed to the shielded electric wire, and is attached to a shield wall to electrically connect the shield layer and the shield wall, and the shield. A shield connector that penetrates the core wire of the electric wire through the shield wall, has conductivity, is electrically connected to the exposed shield layer and is in contact with the shield wall; and In a thing provided with a mold holding part molded on an outer peripheral surface and holding the conductive flange on the shielded electric wire, an uneven surface is formed on at least a part of a contact surface of the conductive flange with the mold holding part. In addition, a shield connector is disclosed in which an adhesive is applied at least on the uneven surface.
Japanese Patent Laid-Open No. 2003-272779

When processing the end of the coaxial cable for a connector, it is necessary to solder the external conductor exposed at the end of the coaxial cable and the GND bar. Conventionally, this portion has been soldered by using a heater chip to heat a GND bar and a plate solder having the same depth as the outer conductor to the outer conductor exposed at the end of the coaxial cable. At that time, the melted solder is sucked up by the outer conductor by capillary action. The problems caused by this solder wicking are as follows.
(1) When the soldered portion is inserted into the hinge hole, the probability that the outer conductor is rubbed into the hinge hole and disconnected is increased.
(2) Since the diameter of the hinge hole into which the connector can be inserted increases, the type of hinge used is restricted.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of soldering a coaxial cable that can prevent solder sucking up when the outer conductor exposed at the end of the coaxial cable and the GND bar are soldered.

  In order to achieve the above object, the present invention applies a curable resin between the jacket and the outer conductor when soldering the outer conductor exposed at the end of the coaxial cable and the GND bar. Provided is a method for soldering a coaxial cable, characterized by curing and then soldering an outer conductor and a GND bar.

  In the method for soldering a coaxial cable of the present invention, the curable resin is a UV curable resin, and the resin is preferably cured by UV irradiation after the resin is applied.

  In the coaxial cable soldering method of the present invention, the curable resin may be a cyanoacrylate adhesive.

  In the method for soldering a coaxial cable according to the present invention, it is preferable to perform soldering by curing the outer conductor inside the GND bar with resin.

  The present invention also provides a coaxial cable assembly manufactured by soldering an outer conductor and a GND bar by the soldering method according to the present invention.

According to the present invention, when the outer conductor exposed at the end portion of the coaxial cable and the GND bar are soldered, the curable resin is applied between the jacket and the outer conductor, the curable resin is cured, and then the outer By soldering the conductor and the GND bar, it is possible to prevent the solder from being sucked up by the external conductor due to the capillary phenomenon.
As a result, when the soldered portion is inserted into the hinge hole, it is possible to reduce the probability that the outer conductor will rub against the hinge hole and break.
Moreover, since the solder suck-up can be prevented, the diameter of the hinge hole that can be inserted is reduced, and the types of usable hinges are increased.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a terminal portion of a semi-harness 1 used when a large number of coaxial cables 2 are arranged and a connector is used for a terminal. The coaxial cable 2 includes a center conductor 3, an insulation 4 on the outer periphery thereof, an outer conductor 5 provided on the outer periphery of the insulation 4, and a jacket 6 covering the outer conductor 5. In the terminal portion of FIG. 1, the end of each coaxial cable 2 is processed such that the center conductor 3, the insulation 4, and the outer conductor 5 are exposed for a predetermined length.

FIG. 2 is a front view of an essential part showing an embodiment in which the coaxial cable soldering method according to the present invention is implemented in the semi-harness 1 shown in FIG.
When processing the end of the coaxial cable 2 for a connector, it is necessary to solder the outer conductor 5 exposed at the end of the coaxial cable 2 and the GND bar 7. At the time of this soldering, conventionally, since the sheet solder is simply heated and melted to perform soldering between the outer conductor 5 and the GND bar 7, the melted solder comes into contact with the outer conductor 5, and the molten solder is caused by capillary action. There was a problem of being sucked up.

  On the other hand, in the present invention, when the outer conductor 5 exposed at the end portion of the coaxial cable 2 and the GND bar 7 are soldered, a curable resin is applied between the jacket 6 and the outer conductor 5, and the curability is increased. The resin is cured, and then the outer conductor 5 and the GND bar 7 are soldered. In the example shown in FIG. 2, a UV curable resin is used as the curable resin, and the UV curable resin (uncured resin liquid) is applied to the UV resin application portion indicated by reference numeral 8 in FIG.

When a UV curable resin is used as the curable resin, the resin liquid can be easily applied to a desired portion using a dispenser or the like. It is particularly preferred because it can be cured in time. Next, advantages of selecting a UV curable resin will be described.
(A) The metal (the outer conductor 5 and the GND bar 7) should not be altered.
(B) The application area can be controlled. That is, the viscosity can be freely selected and can be prevented from spreading over a wide range during application.
(C) Curing in a short time.
(D) Do not damage many parts after curing.
In the present invention, the curable resin is not limited to the UV curable resin, and may be, for example, a cyanoacrylate diameter adhesive.

By applying and curing the curable resin, the curable resin is applied and cured between the jacket 6 and the outer conductor 5 and the outer conductor 5 on the end side thereof, and the gap between the outer conductors 5 is closed by the cured resin. . Thereby, when the outer conductor 5 and the GND bar 7 are soldered, the melted solder is not sucked up by the outer conductor 5.
As a result, when the soldered portion is inserted into the hinge hole, it is possible to reduce the probability that the outer conductor will rub against the hinge hole and break.
Moreover, since the solder suck-up can be prevented, the diameter of the hinge hole into which the obtained connector can be inserted becomes small, and the types of hinges that can be used increase.
Hereinafter, the effect of the present invention will be demonstrated by examples.

(Example: with UV resin coating)
In the coaxial cable terminal shown in FIG. 2, the outer conductor and the GND bar were soldered according to the present invention. In the embodiment, since the GND bar is soldered after the resin application, the resin does not rest on the GND bar, but in FIG. 2, the UV resin is applied to a part of the GND bar so that the application position can be easily understood. The application part 8 is drawn.
A commercially available product (trade name: Loctite 352) was used as the UV curable resin.
A dispenser was used as a method for applying the resin.
The film thickness of the formed resin layer was 0.1 mm or less.
The curing method and conditions of the resin were cured by irradiation with a high-pressure mercury lamp (illuminance: 100 mW / cm ² ) for 10 seconds.
After applying and curing the UV curable resin, the external conductor and the GND bar were soldered.

(Comparative example: without UV resin application)
It was the same as the example except that the UV curable resin was not applied.

FIG. 3 is a diagram illustrating a soldered portion of a sample in which the external conductor and the GND bar are soldered in the comparative example. In the comparative example, it was confirmed that the solder was sucked up to a length of 2 to 3 mm from the soldering portion.
On the other hand, FIG. 4 is a diagram illustrating a soldering portion in the embodiment. In the example, the solder sucking length from the soldering portion was 1 mm or less.

  FIG. 5 is a graph showing the measurement results of the solder siphoning length in the cables of the example and the comparative example. As shown in FIG. 5, in the case of the comparative example (without UV resin application), the solder suction length is about 2 to 3 mm, whereas in the case of the example (with UV resin application), the solder suction is performed. The length is 1 mm or less, and it has been proved that the solder suction can be suppressed by the specification of the resin.

(connector)
An example of the connector produced in the Example is shown in FIG. In FIG. 6, reference numeral 9 is a cable, and 10 is a connector.
The type of hinge that passes the cable has a hole for passing the cable. Since the work procedure changes depending on whether or not the hole can be passed with the connector attached, device manufacturers place importance on this point. If the hole cannot be passed with the connector attached, the hole is passed only with the cable, and then the connector is attached. In this method, since the cable is processed after the hinge is manufactured, it may take a long time to complete. In addition, the number of processing steps for attaching the connector increases.

  When passing through the hinge hole, the cable end portion is shaped as shown in FIG. 6, and the connector is inserted into the hinge hole from the right side of FIG. At this time, if the length indicated by the symbol A in FIG. 6 is increased, the diameter of the hinge hole through which the thread can pass is also increased. That is, it can pass only through a hinge having a large hinge hole. On the other hand, if the length A is small, it can be passed through a small hinge hole and can be passed through a hinge having a smaller hinge hole. As a result, there are more hinge specifications that can be used.

  Note that the length B is constant depending on the type of connector (selected by the equipment manufacturer from various conditions). If the length A is to be reduced, the length C must be reduced. In mass production, it is necessary to suppress variations in the length A (= length C).

It is a principal part front view which shows the semi harness using a coaxial cable. It is a principal part front view which shows the form which implements the soldering method of the coaxial cable by this invention. It is a principal part front view which shows the solder sucking-up state by a comparative example. It is a principal part front view which shows the solder sucking-up state by an Example. It is the graph which compared the solder siphoning length of the cable produced by the Example and the comparative example. It is an external view of the connector produced in the Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Semi harness, 2 ... Coaxial cable, 3 ... Center conductor, 4 ... Insulation, 5 ... Outer conductor, 6 ... Jacket, 7 ... GND bar, 8 ... UV resin application part, 9 ... Cable, 10 ... Connector.

Claims (5)

  When soldering the outer conductor exposed at the end of the coaxial cable and the GND bar, a curable resin is applied between the jacket and the outer conductor, the curable resin is cured, and then the outer conductor and the GND bar are bonded. A method of soldering a coaxial cable, characterized by soldering.   The method of soldering a coaxial cable according to claim 1, wherein the curable resin is a UV curable resin, and the resin is cured by UV irradiation after the resin is applied.   The coaxial cable soldering method according to claim 1, wherein the curable resin is a cyanoacrylate adhesive.   4. The method of soldering a coaxial cable according to claim 1, wherein the soldering is performed by curing the outer conductor inside the GND bar with resin.   A coaxial cable assembly manufactured by soldering an outer conductor and a GND bar by the soldering method according to claim 1.

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