JP5331401B2 - Fabrication method of micro coaxial cable assembly and micro coaxial cable assembly - Google Patents

Description

  The present invention relates to a method for manufacturing a micro coaxial cable assembly, and more particularly, to a method for manufacturing a micro coaxial cable assembly and a micro coaxial cable assembly that can reduce manufacturing time and improve durability against multiple bendings. .

  In recent years, electronic devices typified by mobile phones have been rapidly reduced in size, weight and functionality. Along with this, in mobile phones with a twisting mechanism, there are increasing opportunities to use ultra-fine coaxial cables having high bending characteristics. Also, with the recent development of portable TVs, the structure of portable devices has become complicated, and the space for wiring has also decreased.

  Currently, harnesses using micro coaxial cables are used with cables of about 40 cores or more. However, when the connector 104 is connected to the end of these cables 103 as shown in FIG. As a result, the micro coaxial cable assembly 100 is obtained. However, since the individual cables 103 move individually, the cables 103 are separated as shown in FIG. For example, when incorporating a plurality of micro coaxial cables into a portable electronic device such as a mobile phone, the wiring space of the micro coaxial cables is narrow and complicated. Therefore, in the case of using the conventional micro coaxial cable assembly, the cables are entangled with each other, and it is difficult to apply the wiring as a portable electronic device. Therefore, when a cable assembly is used in a portable electronic device such as a mobile phone, as shown in FIG. 7, the micro coaxial cable assembly 110 has a structure in which the micro coaxial cable 113 is bundled with a tape 111, as shown in FIG. Thus, it is used as the wiring of the mobile phone 200.

When the micro coaxial cable 113 is bundled with the tape 111, a bundling method using a thin (about 60 μm or less) tetrafluoroethylene resin porous membrane is generally considered in consideration of bending resistance.
For example, as shown in FIG. 9, in the micro coaxial cable assembly 120 disclosed in Patent Document 1, the cable 123 is bound and protected by winding a tape 121 around the cable 123.
For example, as shown in FIG. 10, in the micro coaxial cable assembly 130 disclosed in Patent Document 2, the cable 133 is bound and protected by winding a tape 131 around the cable 133. Further, the portion 133a to which the cable 133 is twisted is configured such that the tape 133 is not attached to improve the bending resistance.

As described above, in the conventional manufacturing method, a tape material is used as a bundle of cables, and as shown in FIG. The cable 113 is bundled. At this time, since the tape 111 is thin and each of the micro coaxial cables 113 to be bound is soft, manual tape winding is generally used. For this reason, the number of work steps is increased, which causes an increase in cost.
FIG. 12 is a diagram schematically showing a state where the conventional micro coaxial cable assembly 110 is bent. 12A is an overall view schematically showing a bent conventional micro coaxial cable assembly, and FIG. 12B is an enlarged view of α in FIG. 12A, schematically showing the inside of a binding portion. FIG. 12 (c) is a cross-sectional view perpendicular to the longitudinal direction of the micro coaxial cable at the α portion shown in FIG. 12 (a). As shown in FIG. 12B, a twisted portion is generated in the conventional micro-coaxial cable 113 wound with tape.
In the conventional micro coaxial cable assembly 110 wound in a spiral shape, the outermost micro coaxial cable 113b of the micro coaxial cable bundle contacting the tape 111 is fixed to the tape 111 as shown in FIG. End up. Therefore, as shown in FIGS. 12 (a) and 12 (b), the bending state of the micro coaxial cable is not naturally bent in the vicinity of the bent portion or the connecting portion 4 (4a, 4b), and the bending is repeated. Stress accumulates. In a portable electronic device such as a mobile phone, a bending durability characteristic of 100,000 to 200,000 times is generally required. The conventional method of winding a tape on a micro coaxial cable in a spiral shape is mainly performed manually, so it is difficult to make the winding state of the tape uniform, and the tape and the micro coaxial cable are bonded. Therefore, if the tape is wound non-uniformly, the ultra-fine coaxial cable is kinked depending on the state of the tape, and the durability characteristics of the obtained ultra-fine coaxial cable may be non-uniform.
JP 2007-220495 A JP 2007-144139 A

  The present invention has been made in view of the above circumstances, and a manufacturing method of an ultrafine coaxial cable assembly that can shorten the manufacturing time and can make the bending resistance of the ultrafine coaxial cable assembly uniform for each product. provide.

According to a first aspect of the present invention, there is provided a method for manufacturing a micro coaxial cable assembly, wherein a plurality of micro coaxial cables are arranged in parallel to align both terminals, a first connection portion is provided on one end of the terminal, and A second connecting portion and a telescopic tubular body are prepared, and a jig is inserted into the hollow portion of the tubular body from one opening thereof. Expanding the diameter so that the diameter of the hollow portion increases, and maintaining the expanded state of the diameter of the hollow portion, the micro coaxial cable passes through the hollow portion from one opening of the hollow portion to the other opening The step of inserting the structure into the hollow part toward the part, and utilizing the fact that the tubular body contracts when the jig is removed from the hollow part, the first connection part and the The micro coaxial cable is tubular so that the second connection portion is exposed. In and having a, a step of coating.
According to a second aspect of the present invention, there is provided the method for manufacturing the micro coaxial cable assembly according to the first aspect, wherein the jig has a portion that expands the diameter of the hollow portion in the longitudinal direction of the tubular body. It is characterized by.
According to a third aspect of the present invention, there is provided a method for producing a micro coaxial cable assembly according to the first or second aspect, wherein a silicon rubber tube is used as the tubular body.

In the micro coaxial cable assembly according to claim 4 of the present invention, a plurality of micro coaxial cables arranged in parallel are arranged at both terminals, and a first connection portion is provided at one end of the terminal, and the other end of the terminal is provided. A structure in which a second connection portion is arranged, and in the structure, a region excluding one of the first connection portion and the terminal and the other of the second connection portion and the terminal is bundled An ultrafine coaxial cable assembly comprising a stretchable tubular body to be coated, and when the microcoaxial cable is deformed, each microcoaxial cable has a degree of freedom in its axial direction in the hollow portion of the tubular body. It is characterized by having.
The micro coaxial cable assembly according to claim 5 of the present invention is characterized in that, in claim 4, the tubular body includes silicon rubber.
The micro coaxial cable assembly according to claim 6 of the present invention is characterized in that, in claim 5, the thickness of the tubular body is 0.05 mm or more and 0.2 mm or less.

  According to the present invention, an ultrafine coaxial cable assembly can be produced simply by inserting a structure into a telescopic tubular body. Therefore, the manufacturing time can be shortened as compared with the manufacturing method in which the conventional tape is wound around the micro coaxial cable in a spiral shape. In addition, kinking that occurs in the micro coaxial cable during the manufacturing process is suppressed, and the durability characteristics can be made uniform.

  Hereinafter, the present invention will be described in detail with reference to the drawings. However, the present invention is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

FIG. 1 is a view schematically showing a method of manufacturing the micro coaxial cable assembly of the present invention.
First, as shown in FIG. 1A, a telescopic tubular body 1 and a structure 5 are prepared.
As the expandable tubular body 1, for example, a tube made of silicon rubber, natural rubber or the like can be used. A silicone rubber tube is preferable because it has heat resistance and flexibility. Here, the tube made of silicon rubber (tubular body 1 made of silicon rubber) means one having a silicon rubber content of 80% or more and 100% or less.
The inner diameter of the tubular body 1 can be prepared by appropriately adjusting the size and the number of the micro coaxial cables 3 to be inserted.

The thickness of the tubular body 1 is appropriately adjusted according to the material of the tubular body 1, the size and number of the micro coaxial cables 3, the applied electronic device, and the like. For example, the tubular body 1 is a tube made of silicon rubber. In this case, the thickness is preferably 0.05 mm or more and 0.2 mm or less. When the thickness is less than 0.05 mm, the tubular body 1 is easily damaged when the micro coaxial cable assembly 10 is bent a plurality of times. Moreover, when it expands so that the diameter of the hollow part 1b of the tubular body 1 may become large in a manufacturing process, it becomes easy to produce damage to the tubular body 1, and there exists a possibility that a yield may fall. Moreover, it becomes easy to produce damage by rubbing with the housing | casing of an electronic device.
On the other hand, if the thickness of the tubular body 1 exceeds 0.2 mm, the bending characteristics of the obtained ultrafine coaxial cable assembly may be deteriorated. Moreover, when expanding so that the diameter of the hollow part 1b may become large, a bigger force is required and there exists a possibility that workability | operativity may fall. Moreover, there is a possibility that the connecting portions 4a and 4b in FIG. 1 cannot be passed.

  In the structure 5, a plurality of micro coaxial cables 3 arranged in parallel are aligned at both terminals 3 a and 3 b, a first connection 4 a at one end 3 a of the terminal, and a second connection at the other 3 b of the terminal. 4b is arranged.

As the 1st connection part 4a and the 2nd connection part 4b, if it was conventionally used with the portable electronic device, it will not be specifically limited, It can use.
The extra fine coaxial cable 3 can be used without particular limitation as long as it has been conventionally used in portable electronic devices. For example, it is constituted by a central conductor made of a single core wire, a stranded wire, etc., an insulator covering the outer periphery thereof, an outer conductor arranged coaxially on the outer side of the insulator, and a skin covering the outer side. The outer conductor can be constituted by a horizontal winding, a braided structure, or the like.
The ultra-fine coaxial cable 3 is preferably a cable having a central conductor size of AWG 36 or less, and more preferably a cable in the range of AWG 42 to 50. For example, AWG 46 to AWG 42 (having an outer diameter of about 0.2 to 0.3 mm) can be used. Note that AWG is an abbreviation for American Wire Gauge, and is a standard widely used in the coaxial cable industry.

  Next, as shown in FIG. 1 (b), the jig 2 is inserted into the hollow portion 1b of the tubular body 1 from the one opening 1c, and as shown in FIG. 1 (c), the hollow portion 1b. The hollow portion 1b of the tubular body 1 is expanded using the jig 2 so that the diameter of the tubular body 1 increases. At this time, if the hollow portion 1b is opened so that the diameter of the hollow portion is, for example, about 10 mm, it becomes easy to insert the structure 5 in the next step. Note that the jig 2 may be inserted into the other opening 1d of the hollow portion 1b, and the hollow portion 1b of the tubular body 1 may be expanded using the jig 2 so that the diameter of the hollow portion 1b is increased.

  The jig 2 preferably has a portion 2 a that expands the diameter of the hollow portion 1 b in the longitudinal direction of the tubular body 1, particularly in the entire longitudinal direction. In the next step, the structure 5 can be easily inserted into the hollow portion 1b. An example of such a jig 2 is tweezers.

Next, as shown in FIG. 1 (d), one opening 1c of the hollow portion 1b is passed so that the micro coaxial cable 3 passes through the hollow portion 1b while maintaining the expanded diameter of the hollow portion 1b. The structure 5 is inserted into the hollow portion 1b toward the other opening 1d. In addition, you may insert the structure 5 in the hollow part 1b toward the one opening part 1c from the other opening part 1d of the hollow part 1b.
Thereafter, by removing the jig 2 from the hollow portion 1b of the tubular body 1, the tubular body 1 that has been expanded and contracted contracts, and the micro coaxial cable 3 is covered with the tubular body 1 as shown in FIG. The At this time, in the structure 5, a region excluding the first connecting portion 4 a, the one end 3 a of the terminal, the second connecting portion, and the other end 3 b of the terminal is covered with the tubular body 1.

As described above, since the method for manufacturing the micro coaxial cable assembly 10 of the present invention can be manufactured simply by inserting the structure 5 into the tubular body 1, a tape is wound around the micro coaxial cable in a spiral manner as in the prior art. The manufacturing time can be shortened than the manufacturing method.
In addition, the conventional method of winding a tape in a spiral shape on an ultra-fine coaxial cable is mainly performed manually, so it is difficult to make the tape wound evenly, and the tape and the ultra-fine coaxial cable are bonded together. Therefore, if the tape is wound non-uniformly, the ultra-fine coaxial cable is kinked depending on the state of the tape, and the durability characteristics of the obtained ultra-fine coaxial cable may be uneven. On the other hand, according to the manufacturing method of the present invention, the micro coaxial cable 3 can move with a high degree of freedom in the tubular body 1 because it is obtained by inserting the structural body 5 into the tubular body 1. Therefore, according to the manufacturing method of the present invention, the kinks generated in the micro coaxial cable during the manufacturing process are suppressed, and the durability characteristics can be made uniform.

FIG. 2 is a view schematically showing the micro coaxial cable assembly of the present invention. FIG. 2A shows a micro coaxial assembly, and FIG. 2B schematically shows a state when the micro coaxial assembly is bent.
In the micro coaxial assembly 10 of the present invention, a plurality of micro coaxial cables 3 arranged in parallel are aligned at both terminals 3a and 3b, a first connecting portion 4a is provided on one end 3a of the terminal, and a second connection 3b is provided on the other end 3b of the terminal. In the structure 5 in which the two connection portions 4b are arranged, and in the structure 5, a region excluding the first connection portion 4a and the one of the terminals 3a and the second connection portion 4b and the other of the terminals 3b is bundled. And a stretchable tubular body 1 that is covered. Further, when the micro coaxial cable 3 is deformed, each micro coaxial cable 3 has a degree of freedom in the axial direction in the hollow portion 1b of the tubular body 1. The structure 5 and the tubular body 1 are as described above.

  In the micro coaxial cable assembly 10 of the present invention, since each micro coaxial cable 3 is not bonded and fixed to the tubular body 1, when the micro coaxial cable assembly 10 is bent as shown in FIG. The micro coaxial cable 3 arranged in the can be moved in the axial direction inside the tubular body 1 (hollow part 1b). Therefore, it is difficult for stress to concentrate on the bent portion of the micro coaxial cable. Therefore, the bending durability can be improved and it can be used for a long time.

  Since the micro coaxial cable assembly 10 of the present invention is excellent in bending durability, a plurality of housings having circuits are slidably joined to each other, and the circuits in these housings are electrically connected by electric wires such as micro coaxial cables. It can be used for electronic devices connected to the mobile phone, in particular, mobile terminal devices such as mobile phones and PDAs (Personal Digital Assistants), and wiring between housings of the electronic devices.

FIG. 3 is a view schematically showing an example of an electronic device 30 on which the micro coaxial assembly of the present invention is mounted. 3A is a perspective view, FIG. 3B is a top view, and FIG. 3C is a side view.
The electronic device 30 shown in FIG. 3 is attached so that the first housing 31 and the second housing 32 can reciprocate in a predetermined sliding direction D along the opposing surfaces 31a and 32a facing each other. Between the 1st housing | casing 31 and the 2nd housing | casing 32, the micro coaxial cable assembly 10 in which the connection parts 4a and 4b were formed in each terminal 3a and 3b is wired, and the 1st connection part 4a. Are connected to the first casing 31 and the second connecting portion 4b is connected to the second casing 32, respectively. Specifically, a circuit (not shown) is accommodated in each of the casings 31 and 32, and the circuit side connection part connected to the circuit and the connection parts 4a and 4b of the micro coaxial cable assembly 10 are connected. Thus, the circuit in the first housing 31 and the circuit in the second housing 32 are connected via the micro coaxial cable assembly 10. For connection between the circuit side connection portion and the connection portions 4a and 4b of the micro coaxial cable assembly 10, an appropriate method such as connector or soldering can be used. Here, the mode of the slide movement is, for example, a reciprocating linear movement.

  The micro coaxial cable assembly 10 is folded back via a bent portion F formed at the center in the longitudinal direction, and the bent portion F is formed on the opposing surfaces 31a of the first casing 31 and the second casing 32, It is accommodated between 32a. Since the micro coaxial cable assembly 10 of the present invention has excellent bending resistance, the gap T between the opposing surfaces 31a and 32a of the first housing 31 and the second housing 32 is 3 mm, for example, and the bent portion F Even when the radius of curvature is, for example, 4 mm, damage and disconnection of the fine coaxial cable are suppressed, and the life of the electronic device 30 can be extended.

The first connection portion 4a and the second connection portion 4b are arranged side by side in the sliding direction D, and the direction from the first connection portion 4a toward the bent portion F and the second connection portion 4b to the bent portion F are arranged. One of the two directions is the same direction along the slide direction D, and the other is a direction perpendicular to the slide direction D.
In FIG. 3, the direction from the first connecting portion 4a toward the bent portion F is a direction perpendicular to the sliding direction D, and the direction from the second connecting portion 4b toward the bent portion F is the sliding direction D. The direction from the first connecting portion 4a toward the bent portion F is the same direction along the sliding direction D, and the second connecting portion 4b toward the bent portion F. The direction may be a direction perpendicular to the slide direction D.
When the circuit side connection is accommodated in the housings 31 and 32, the first connection 4 a and the second connection 4 b are also disposed in the housings 31 and 32. For this reason, the housings 31 and 32 can be provided with openings (not shown) into which the micro coaxial cable assembly 10 is inserted. By shifting the position of the first connecting portion 4a from the second connecting portion 4b to the direction orthogonal to the sliding direction D (the left-right direction in FIG. 3B) (W portion in FIG. 3B), In the bent portion F, the curved shape of each micro coaxial cable spreads in the lateral direction, and the radius of curvature can be increased. In this case, for example, by setting W to 16 mm, it can be applied to an electronic device in which the gap T between the facing surfaces 31a and 32a is 3 mm and the curvature radius of the bent portion F is 4 mm. As described above, the micro coaxial cable of the present invention can be applied even to the electronic device 30 in which the distance between the first housing 31 and the second housing 32 is short. In particular, since the micro coaxial cable of the present invention is excellent in anti-bending properties, the electronic device 30 can be used for a long period of time.

  The number of housings constituting the electronic device 30 is not limited to two, and may be three or more. For example, when the number of housings is 3, the wiring between housings between the first housing and the second housing, or between the second housing and the third housing As the inter-casing wiring, the micro coaxial cable assembly obtained by the manufacturing method of the present invention may be used.

<Example>
As a tubular body, a silicon rubber tube having a thickness of 0.1 mm, an inner diameter of 2.0 mm, and an outer diameter of 2.2 mm was prepared. In addition, a 40-core coaxial cable (AWG42) having an outer diameter of 0.29 mm was prepared as a coaxial cable. Next, one end of the coaxial cable was connected to the first connection portion, and the other end of the coaxial cable was connected to the second connection portion to produce a structure. Thereafter, tweezers were inserted into the silicon rubber tube to expand the hollow portion, and the structure was passed through the hollow portion. Next, the tweezers were removed from the hollow portion, and the micro coaxial cable was covered with the silicon rubber tube by contraction of the silicon rubber tube, so that a harness wiring state as shown in FIG. 2 was obtained. This was used as the micro coaxial cable assembly of Example 1.

<Comparative example>
An ultrafine coaxial cable assembly was produced in the same manner as in the example except that the ultrafine coaxial cable was bundled with a tape.

The micro coaxial cable assemblies of Examples and Comparative Examples prepared above were mounted on electronic devices as shown in FIG. 3, and the slide was tested 100,000 times as a slide durability test. The results are shown in FIGS. In each of the examples and comparative examples, 5 samples were prepared and subjected to a slide durability test.
FIG. 4 shows the number of slides when the micro coaxial cable is damaged when the slide is performed 100,000 times. In the case of no damage, the number of slides is 100,000. From FIG. 4, among the five electronic devices in the comparative example, three electronic devices (samples 2, 4, and 5) achieved 100,000 times, but two electronic devices (samples 1 and 3) out of them had 80,000 times. The micro coaxial cable was damaged to some extent. On the other hand, in the electronic device to which the micro coaxial cable assembly of the example was applied, all five samples (samples 6 to 10) passed the slide durability test 100,000 times.
FIG. 5 is an image of the micro coaxial cable assembly in the example and the comparative example when the slide durability test is completed. FIG. 5A is a photograph of the micro coaxial cable assembly in the comparative example, and FIG. 5B is a photograph of the micro coaxial cable assembly in the embodiment. From FIG. 5, in the micro coaxial cable assembly of the comparative example, damage to the tape bundling portion could be confirmed in all cases, but in the micro coaxial cable assembly manufactured using the silicon rubber tube of the embodiment, the bundling of the micro coaxial cable was performed. No damage was observed on the part (silicon rubber tube).
As described above, according to the present invention, it is possible to provide a method of manufacturing a micro coaxial cable assembly that can improve durability and reduce manufacturing time.

  INDUSTRIAL APPLICABILITY The present invention can be used for internal wiring of a portable electronic device having a sliding structure or the like or an electronic device with a twisting mechanism.

It is process drawing which showed typically the manufacturing method of the micro coaxial cable assembly of this invention. It is the figure which showed typically the mode at the time of bending the micro coaxial cable assembly obtained with the manufacturing method of this invention. It is the figure which showed typically the electronic device to which the micro coaxial cable assembly obtained with the manufacturing method of this invention was applied. It is the graph which showed the result of the bending endurance test in an example and a comparative example. It is an image of the Example after a bending endurance test, and a comparative example. It is the figure which showed typically the mode at the time of connecting a connection part to the terminal of the conventional micro coaxial cable. It is the figure which showed typically the mode at the time of applying a micro coaxial cable assembly to a mobile phone, for example. It is the figure which showed typically an example of the conventional micro coaxial cable. It is the figure which showed typically another example of the conventional micro coaxial cable. It is the figure which showed typically another example of the conventional micro coaxial cable. It is the image which showed the micro coaxial cable assembly at the time of winding a tape in spiral shape. It is the figure which showed the mode at the time of bending produced in the conventional micro coaxial cable assembly which wound the tape in the spiral shape.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Tubular body, 1b Hollow part, 1c One opening part, 1d Other opening part, 2 Jig, 3 Fine coaxial cable, 3a One terminal, 3b The other terminal, 4a 1st connection part, 4b 2nd Connection part, 5 structure, 10 micro coaxial cable assembly, 30 electronic device, 31 1st housing | casing, 32 2nd housing | casing, 31a, 32a Opposite surface.

Claims (6)

A structure in which a plurality of micro coaxial cables are arranged in parallel to align both terminals, a first connection part is arranged on one of the terminals, and a second connection part is arranged on the other of the terminals, and can be expanded and contracted Prepare a tubular body,
Inserting a jig from one of the openings to the hollow portion of the tubular body, and expanding the hollow portion so that the diameter of the hollow portion increases;
While maintaining the expanded state of the diameter of the hollow portion, the micro coaxial cable passes from the hollow portion toward the other opening so that the micro coaxial cable passes through the hollow portion. Inserting into the hollow part;
Utilizing the fact that the tubular body contracts when the jig is removed from the hollow part, the micro coaxial cable is used to expose the first connection part and the second connection part. Coating with a tubular body;
A method for producing an ultrafine coaxial cable assembly, comprising:   2. The method of manufacturing an ultrafine coaxial cable assembly according to claim 1, wherein the jig has a portion that expands a diameter of the hollow portion in a longitudinal direction of the tubular body.   3. The method for producing an ultrafine coaxial cable assembly according to claim 1, wherein a silicon rubber tube is used as the tubular body. A structure in which a plurality of micro coaxial cables arranged in parallel are arranged at both terminals, a first connection part on one of the terminals, and a second connection part on the other of the terminals; and A micro coaxial cable assembly comprising a stretchable tubular body that bundles and covers a region excluding one of the first connection part and the terminal and the other of the second connection part and the terminal in the structure. There,
When the micro coaxial cable is deformed, each micro coaxial cable has a degree of freedom in the axial direction in the hollow portion of the tubular body, and one of the terminals in the plurality of micro coaxial cables and the terminals A micro coaxial cable assembly, wherein the other region is exposed .   The micro coaxial cable assembly according to claim 4, wherein the tubular body includes silicon rubber.   6. The micro coaxial cable assembly according to claim 5, wherein a thickness of the tubular body is 0.05 mm or more and 0.2 mm or less.

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