JP2008262724A - Electronic device and harness for wiring electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic device capable of introducing an extra-fine coaxial cable to a slide type mobile terminal device and having superior resistance to slide bending, and a harness for wiring the electronic device. <P>SOLUTION: In the electronic device in which a plurality of cases having circuits are slidably connected and respective circuits in the cases are electrically connected with the harness for wiring an electronic device, the harness for wiring an electronic device has a cable laminating section in which numerous wires are lined up in parallel and a plurality of tape-shaped cables set up to be a collective tape by a jacket material with Young's modulus of 400-8000 MPa are laminated, and the cable laminating section is wired on the slide surface of the case in a U-shape. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic device formed by joining a plurality of casings having circuits in a slidable manner, and electrically connecting the circuits in these casings by an electric wire such as a micro coaxial cable. The present invention relates to a mobile terminal device such as Personal Digital Assistants) and a harness used for wiring between housings of the electronic device.

  In recent years, electronic devices typified by mobile phones have been rapidly reduced in size, weight and functionality. Therefore, a large number of IC chips are mounted, the transmission capacity is increased, the transmission speed is increased, and the transmission frequency is particularly in a high frequency band. Along with this, the electrical signal noise in the device also increases, so that an electrical signal transmission medium is required to have excellent electromagnetic wave shielding characteristics. For this reason, instead of an FPC (Flexible Printed Circuit), an assembly of ultra-fine coaxial cables excellent in electromagnetic wave shielding (shielding) characteristics has been introduced as an internal wiring material in equipment. In small electronic devices, particularly mobile terminal devices such as mobile phones, the clamshell type shown in FIG. 5A, the jack knife type shown in FIG. 5B, and the two-axis type shown in FIG. An assembly of extra fine coaxial cables has been introduced.

  However, with respect to the slide-type mobile terminal device shown in FIG. 5 (d), the FPC is still used, and an assembly of micro coaxial cables has not been introduced. This is due to the slide-type mechanical structure, and conventionally, it has been difficult to use the micro coaxial cable. FIG. 6 is a diagram illustrating a case where the FPC 4 is applied as the inter-casing wiring member of the slide type electronic device 1. The electronic device 1 has a structure in which respective circuits of the first housing 2 and the second housing 3 slidably joined to the first housing 2 are electrically connected by the FPC 4. It has become.

  Therefore, in order to increase the functionality and multifunction of the slide-type mobile terminal device, it is essential to introduce a micro-coaxial cable assembled like other structures. In short, it has been desired to introduce a slide type mobile terminal device assembled with a micro coaxial cable. For example, the techniques disclosed in Patent Documents 1 and 2 have been proposed as an example of introducing a micro coaxial cable into a mobile terminal device.

  That is, it is known to use a micro coaxial cable for a mobile terminal device, and it is also known that such a device is already on the market. However, as described in Patent Documents 1 and 2, ultra-fine coaxial cables are used for folding (clamshell type), opening and closing + twisting (biaxial type), etc. No case has been seen. On the other hand, it is known that an FPC is used as a connection means between cases of a slide type mobile terminal device. For example, techniques disclosed in Patent Documents 3 to 5 have been proposed.

A typical shape, structure, and mechanical operation of a mobile terminal device, particularly a mobile phone, is illustrated in FIG. Clamshell type with open / close structure (see FIG. 5 (a)), jackknife type with rotary structure (see FIG. 5 (b)), and biaxial structure that can be opened / closed and rotated called twist type (FIG. 5 (c)) And a slide type having a horizontal movement structure (see FIG. 5D).
A characteristic required for a slide-type structure is horizontal bending in a space with a height restriction. Typically, it is necessary to be able to handle repeated slides in a 3 mm space. Conventionally, as shown in FIG. 6, only FPC which is a thin and flexible printed wiring board can cope with this structure. This is also described in Patent Documents 3 to 5.
Conventionally, it has been considered that the micro coaxial cable is not suitable for a slide type structure. That is, when several dozens of micro coaxial cables are bundled, as a characteristic required for a slide-type structure, it is insufficient as a bending space within a height limit (for example, 3 mm) and satisfies repeated bending characteristics. This is because they cannot.
On the other hand, the structure (clamshell type or jackknife type) in which the bending space is ensured even in the method of grouping the cables into bundles has been put to practical use because sufficient characteristics are ensured. This is shown in Patent Documents 1 and 2.
JP 2006-286299 A JP 2006-202641 A JP 2006-128808 A JP 2006-216908 A Japanese Patent No. 3723539

In general, a micro coaxial cable used in a mobile electronic device typified by a mobile phone is a type called AWG 46 to AWG 42 in a model number, and the outer diameter of the cable is about 0.2 mm to 0.3 mm. . Furthermore, the bending space used in a general slide type structure has a height of about 3 mm, and the number of times of sliding (number of bending resistances) of 100,000 times or more is required.
However, there is a problem that when the above-mentioned micro coaxial cable is used to bend into a space of 3 mm in height without any special measures, there is a problem that the cable bends and the number of repeated slides is the target. It will not reach the value.
Further, as a result of the study by the present inventors, when the ultrafine cables are bundled, a bending radius for satisfying a large number of times (for example, 100,000 times or more) and the number of sliding times (number of bending resistances) is required to be R = 5 mm or more. In a required space (height 3 mm), it is difficult to satisfy the bending characteristics.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electronic device that can introduce an extra fine coaxial cable into a slide-type mobile terminal device and has excellent resistance to slide bending, and a wiring harness for the electronic device. And

In order to achieve the above object, the present invention is an electronic device in which a plurality of housings having circuits are slidably joined and the circuits in these housings are electrically connected by an electronic device wiring harness. And
The electronic device wiring harness has a cable laminated portion in which a plurality of tape type cables formed by arranging a large number of electric wires in parallel and collectively taped with a jacket material having a Young's modulus of 400 to 8000 MPa are laminated, Provided is an electronic device in which a cable stacking portion is wired in a U shape on a sliding surface of a housing.

  In the electronic device of the present invention, it is preferable that at least one of the electric wires is a micro coaxial cable.

  In addition, the present invention has a cable laminated portion in which a plurality of tape-type cables, in which a plurality of electric wires are arranged in parallel and taped with a jacket material having a Young's modulus of 400 to 8000 MPa, are laminated. Provided is an electronic device wiring harness characterized by being used as a wiring material in a device.

  In the electronic device wiring harness according to the present invention, it is preferable that at least one of the electric wires is a micro coaxial cable.

An electronic device according to the present invention is for wiring an electronic device having a cable laminated portion in which a plurality of tape-type cables are laminated by arranging a large number of electric wires in parallel and collectively taped with a jacket material having a Young's modulus of 400 to 8000 MPa. Since the harness is used as a wiring material and the cable stack is wired in a U shape on the slide surface of the housing, it is possible to make an ultra-fine coaxial cable assembly in a space of 3 mm or less in a slide-type electronic device. An electronic device can be provided.
By using the method of the present invention, a micro coaxial cable assembly is possible in a slide-type electronic device, so that transmission characteristics and noise resistance characteristics are improved as compared with those using a conventional FPC as a wiring material between cases. be able to.
The electronic device wiring harness according to the present invention has a configuration in which a plurality of tape-type cables formed by batch tape-forming with a jacket material having a Young's modulus of 400 to 8000 MPa have a cable lamination portion. The bending resistance becomes good, and the bending resistance number of 100,000 times or more required for the slide type electronic device can be satisfied.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an embodiment of an electronic device of the present invention. In the present embodiment, a case where the present invention is applied to a mobile terminal device such as a mobile phone is illustrated as an electronic device. FIG. 1 (a) shows a state when stored, and FIG. 1 (b) shows a state when pulled out.

  In the electronic device 11 of this embodiment, a first housing 12 and a second housing 13 having circuits are slidably joined, and the circuits in these housings 12 and 13 are connected to an electronic device wiring harness 14. (Hereinafter referred to as a harness), and this harness 14 is a tape-type cable in which a large number of electric wires are arranged in parallel and are collectively taped with a jacket material having a Young's modulus of 400 to 8000 MPa. Has a plurality of laminated cable laminated portions 15, and the cable laminated portions 15 are wired in a U shape on the slide surface of the housing.

  Here, the U-shaped wiring is not bent in a space of a predetermined height (for example, 3 mm in height) as in the FPC 4 shown in FIG. 6, but in the lateral direction as in the harness 14 shown in FIG. This is a wiring structure in which the radius of curvature R is taken. By adopting such a wiring structure, in the electronic device 11 of the present embodiment, the bending caused by the sliding operation of the casings 12 and 13 is bending in a space of a predetermined height (see FIG. 6). Compared to the above, the bending operation can be performed with a larger radius of curvature.

Since the electronic device 11 of the present embodiment is formed by wiring the cable stacking portion 15 on the slide surface of the housing in a U shape, in the slide type electronic device 11, the micro coaxial cable assembly is formed in a space of 3 mm or less in height. Is possible.
In addition, since the electronic device 11 of the present embodiment can be an ultra-fine coaxial cable assembly, the transmission characteristics and noise resistance can be improved as compared with an electronic device using a conventional FPC as a wiring material between cases. .

  The harness 14 used in the present invention includes a plurality of laminated cable laminates in which a plurality of tape-type cables are laminated in which a large number of electric wires are arranged in parallel and are collectively taped with a jacket material having a Young's modulus of 400 to 8000 MPa. However, the other components are not particularly limited, but usually have a structure in which connectors for connection are provided at both ends of each flat cable. Each housing 12 and 13 is configured to have a connection portion that can be connected to the connector of the harness 14 at an appropriate position.

  FIG. 2 is a cross-sectional view showing an example of the structure of a tape-type cable constituting the harness 14. The tape type cable 16 of this example has a configuration in which four micro coaxial cables 17 are arranged in parallel and are collectively taped with a jacket material having a Young's modulus of 400 to 8000 MPa. Here, the tape type is one in which a plurality of micro coaxial cables 17 are arranged in parallel and overcoated with a jacket material 18. Therefore, in the tape type cable, as shown in FIG. 2, the jacket material 18 is filled in all the gaps between the micro coaxial cables 17, and there is a “flat” space between the micro coaxial cable 17 and the jacket material 18. Different from "type".

  The micro coaxial cable 17 used in this example includes a central conductor, an inner insulating layer that covers the central conductor, an outer conductor that is wound around the inner insulating layer, and a skin that covers the outer conductor. The structure of the tape-type cable 16 is not limited to this example, as long as two or more micro-coaxial cables 17 or wires other than the micro-coaxial cables are collectively covered with the jacket material 18, and the cables and wires Various types of tape-type cables having different combinations can be laminated and used.

  The tape type cable 16 is manufactured by arranging four micro coaxial cables 17 in parallel and applying a collective jacket by an extrusion method.

  3 and 4 show a state in which a cable laminated portion 15 formed by stacking a plurality of tape-type cables 16 is bent with a predetermined radius of curvature. The thickness a, the width b, and the radius of curvature R of the cable laminated portion 15 can be appropriately set according to the size of the accommodation space in the electronic device to be used.

  The tape type cable 16 used for the harness 14 of the present invention uses a synthetic resin material having a Young's modulus of 400 to 8000 MPa as the jacket material 18. The synthetic resin material only needs to have a Young's modulus within the above range, and can be selected from various ultraviolet curable resins, thermosetting resins, and thermoplastic resins. When the Young's modulus of the jacket material 18 is less than 400 MPa, the rigidity of the tape-type cable 16 is lowered, and stress is applied to the center conductor of the micro coaxial cable at the time of bending, and it breaks at the number of times of bending several tens of thousands or less. End up. If the Young's modulus of the jacket material 18 is 8000 MPa or more, the jacket material 18 itself breaks due to fatigue due to repeated bending, and the target number of bending resistances of 100,000 cannot be achieved.

The harness 14 of the present invention is a cable laminating portion 15 in which a plurality of tape-type cables are laminated in which a large number of electric wires are arranged in parallel and are collectively taped with a jacket material having a Young's modulus of 400 to 8000 MPa. With this configuration, the bending resistance of the tape-type cable 16 becomes good, and the bending resistance number of 100,000 times or more required for the slide-type electronic device can be satisfied.
Hereinafter, the effects of the present invention will be demonstrated by examples.

<Example 1>
-Ultrafine coaxial cable; Model number: AWG46, outer diameter: 0.24 mm.
AWG is an abbreviation for American Wire Gauge, and is a standard widely used in the coaxial cable industry. It produced in the way shown below.
The micro coaxial cable is made by twisting three copper alloy wires with a diameter of 25μm to be the central conductor, covering the outer surface with a fluororesin to form an insulating layer, and winding the outer periphery with a 25μm copper alloy wire by lateral winding. It was made so that the outer diameter was about 240 μm with a fluororesin outer skin.

Jacket material: UV curable resin (hereinafter referred to as UV resin), manufactured by JSR Corporation, trade name: Desolite, R3063, Young's modulus after curing: 700 MPa.
The above-described ultrafine coaxial cable was taped using 4 cores and a jacket material to produce a tape-type cable (tape-type 4-core ultrafine coaxial cable) shown in FIG. The dimensions after fabrication are: width: 1.2 mm, thickness: 0.3 mm.
Here, the tape formation means that several ultra-fine coaxial cables having a circular cross section are arranged in parallel and overcoated with a jacket material. Therefore, this is different from so-called “flattening” in which the jacket material is filled in all portions, the micro coaxial cable is wrapped with a cylindrical jacket material, and a space exists between the jacket material and the micro coaxial cable.

In the 40-core harness in which the flat cable is vertically arranged at the bent portion of the cable and 10 flat cables are laminated, the cable lamination portion can be bundled to a width of 3 mm. And as a bending space used for a general slide type structure, the height is 3 mm. In the harness of the present embodiment, this corresponds to the cable width (b in FIG. 3) when flattened. Since the thickness is 1.2 mm, there is sufficient clearance and bending characteristics can be exhibited.

As described above, the micro coaxial cable needs a bending radius of about R = 5 mm. This is almost the same even when flattened. For this reason, in the harness of this example, the cable stack portion was wired in a U shape on the slide surface of the housing as shown in FIGS. 3 and 4.
As a result, wiring with a height of 3 mm and a refraction radius R = 5 mm was made possible.

<Bending test>
7A and 7B are diagrams for explaining an example of a bending test method for measuring the number of bending resistances of the manufactured harness, FIG. 7A is a plan view of the bending test apparatus, and FIG. 7B is a side view of the same apparatus. It is. In FIG. 7, reference numeral 20 denotes a first test stand, 21 denotes a second test stand, 22 denotes a test harness, 23 denotes a cable lamination portion, and 24 and 25 denote connectors.

  In this bending test, the terminal is first processed, and the central conductor and shield are connected to the whole core series. Next, as shown in FIG. 7, the test harness is arranged at a predetermined position of the bending test apparatus so that a part of the cable laminated portion is U-shaped. Next, in order to perform the bending operation, the test harness is fixed to the sliding sample stage. Connect both ends (not shown) of the conductors connected to the series to a measuring terminal (not shown) for checking conduction, and confirm that there is conduction. The test condition was a stroke amount of 40 mm and 30 reciprocations per minute.

About the harness of Example 1, ten 4 core types were laminated | stacked and it used for the test as 40 cores.
The test conditions described above were carried out while the continuity was maintained, the number of times until the continuity could not be obtained was measured, and the number of bending resistances was examined. The number of samples was N = 50, and an average value, a maximum value, and a minimum value were obtained. However, if continuity is obtained without breaking even if the number of slides is 100,000 times or more, the number of times of bending resistance is 100,000 times or more, or> 100,000 times.

  As a result of intensive studies, the present inventors have found that the rigidity of the jacket material is related to the repeated bending characteristics of the harness. Specifically, by setting the Young's modulus of the jacket material in the range of 400 to 8000 MPa, the target bending resistance of 100,000 times or more is achieved. This point will be described in detail based on the results of Examples 2, 3, and 4 below.

<Example 2>
The same as Example 1 except that the Young's modulus of the UV resin as the jacket material was changed. Three types of A, B, and C were used depending on the resin grade.

<Example 3>
It was the same as Example 1 except having changed the jacket material into the polyimide resin.
Polyimide; manufactured by Industrial Summit Technology, trade name: Buyer ML. Three types of D, E, and F were prepared depending on the resin grade.

<Example 4>
It was the same as Example 1 except having changed the jacket material into the aramid resin.
Aramid resin; manufactured by Teijin Techno Products, trade name: Conex. Three types of G, H, and I were prepared depending on the resin grade.

  About each test harness produced in Examples 2-4, the bending test was done on the same conditions and the number of samples as said <bending test>. The results of Examples 1 to 4 are shown together in Table 1.

From the results shown in Table 1, it can be seen that in the slide type bending test, the number of bending resistances of the test harness depends on the Young's modulus of the jacket material of the tape type cable. When a jacket having a low Young's modulus was used as the jacket material, the tape-type cable had low rigidity, so stress in the bending test was applied to the central conductor, and it broke about tens of thousands of times.
As a result of the test, in order to achieve a bending resistance number of 100,000 times or more, it is necessary to use a material having a Young's modulus of at least 400 MPa as a jacket material.

-Resin types G, H, and I of Example 4 are broken at 100,000 times or less. In this case, the central conductor does not break first. The jacket material was first broken, and immediately after that, the ultra-fine coaxial cable was exposed and finally the center conductor was broken. Therefore, when the rigidity of the taped coaxial cable is too high, the jacket material itself is broken by fatigue due to repeated bending. Therefore, the jacket material needs not only rigidity but also a certain degree of elasticity.
That is, for the resistance to repeated bending in the slide type bending test, it is necessary to use a material having a Young's modulus of 8000 MPa or less as the jacket material.

  In this embodiment, a four-core flat cable is used. However, the number of cores of the ultrafine coaxial cable is not particularly limited because it is possible to flatten the cable if there are two or more cables.

It is a figure which shows one Embodiment of the electronic device of this invention, (a) is a top view which shows the state of the cable lamination | stacking part at the time of accommodation, (b) at the time of drawer | drawing-out. It is sectional drawing which shows an example of the tape type cable used for the harness of this invention. It is a perspective view which shows an example of the cable lamination | stacking part of the harness of this invention. It is a top view which shows an example of the cable lamination | stacking part of the harness of this invention. It is a perspective view which illustrates the various mobile phones from which an opening / closing method differs as an example of an electronic device. It is sectional drawing which shows the prior art example which used FPC as a wiring material between housing | casings. In the Example of this invention, the outline | summary of the testing apparatus used for the measurement of the number of times of bending resistance is shown, (a) is a top view of a testing apparatus, (b) is a side view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Electronic device, 12 ... 1st housing | casing, 13 ... 2nd housing | casing, 14 ... Harness (harness for electronic device wiring), 15 ... Cable lamination | stacking part, 16 ... Tape-type cable, 17 ... Micro coaxial cable, 18 ... Jacket material.

Claims (4)

A plurality of housings having circuits are slidably joined, and the electronic devices in which the circuits in these housings are electrically connected by an electronic device wiring harness,
The electronic device wiring harness has a cable laminated portion in which a plurality of tape type cables formed by arranging a large number of electric wires in parallel and collectively taped with a jacket material having a Young's modulus of 400 to 8000 MPa are laminated, An electronic apparatus in which a cable stacking portion is wired in a U shape on a sliding surface of a housing.   The electronic device according to claim 1, wherein at least one of the electric wires is a micro coaxial cable.   2. The electronic device according to claim 1, wherein the electronic device according to claim 1 has a cable laminated portion in which a plurality of tape-type cables are arranged in parallel and taped with a jacket material having a Young's modulus of 400 to 8000 MPa. An electronic device wiring harness characterized by being used as a material.   The electronic device wiring harness according to claim 3, wherein at least one of the electric wires is a micro coaxial cable.

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