Wiring module

Abstract

The present invention achieves space savings. The wiring module (A) includes a first transfer channel (20) and a sheet-like noise shielding member (40) disposed along the first transfer channel (20). The thickness dimension of the noise shielding member (40) is 100 μm to 600 μm. Since the noise shielding member (40) is sheet-like, a smaller space is sufficient for disposing the noise shielding member (40), so space savings can be achieved. Since the thickness dimension of the noise shielding member (40) is 100 μm to 600 μm, a high noise shielding effect can be obtained.

Description

Technical Field

[0001] The present disclosure relates to a wiring module. Background Art

[0002] The following technique is disclosed in Patent Document 1: A core wire is surrounded by a magnetic core, and the magnetic core is used to remove electromagnetic noise emitted from the core wire.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2017-147307 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In the above technique, since the magnetic core is cylindrical, a large space for arranging the magnetic core is required around the core wire.

[0008] The wiring module of the present disclosure is completed based on the above situation, and its object is to achieve space saving.

[0009] Solutions for Solving the Problems

[0010] The wiring module of the present invention includes:

[0011] A transmission channel; and

[0012] A sheet-like noise shielding member arranged along the transmission channel,

[0013] The thickness dimension of the noise shielding member is 100 μm to 600 μm.

[0014] Effects of the Invention

[0015] According to the present disclosure, space saving can be achieved. Brief Description of the Drawings

[0016] Figure 1 It is a top view of the wiring module of Embodiment 1.

[0017] Figure 2 It is an exploded perspective view of the wiring module.

[0018] Figure 3 It is a cross-sectional view of the wiring module.

[0019] Figure 4 It is a graph showing the magnetic properties of the magnetic material constituting the noise shielding member. Detailed Description of the Invention

[0020] [Description of Embodiments of the Present Disclosure]

[0021] First, embodiments of the present disclosure will be described by way of example.

[0022] The wiring module of the present invention is configured as follows:

[0023] (1) It includes a transmission channel and a sheet-like noise shielding member disposed along the transmission channel, and the thickness dimension of the noise shielding member is 100 μm to 600 μm. According to the structure of the present disclosure, since the noise shielding member is sheet-like, a smaller space is sufficient for disposing the noise shielding member, and space saving can be achieved. Since the thickness dimension of the noise shielding member is 100 μm to 600 μm, a high noise shielding effect can be obtained.

[0024] (2) The thickness dimension of the noise shielding member is preferably 200 μm to 400 μm. According to this structure, a higher noise shielding effect can be obtained.

[0025] (3) The noise shielding member preferably contains a magnetic material having a magnetic property such that the imaginary part of the complex magnetic permeability at 1 GHz to 5 GHz is 5 or more. According to this structure, the magnetic loss of the magnetic material is used to absorb electromagnetic noise emitted from the transmission channel, and a high noise shielding effect can be obtained.

[0026] (4) On the basis of (3), the magnetic material preferably has a magnetic property such that the imaginary part of the complex magnetic permeability is 10 or more at a frequency of 1 GHz. According to this structure, a higher noise shielding effect can be obtained.

[0027] [Details of the embodiments of the present disclosure]

[0028] [Example 1]

[0029] In conjunction with Figures 1 to 4 Example 1 in which the wiring module A of the present disclosure is embodied will be described. It should be noted that the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. In Example 1, with respect to the up-down direction, the Figure 2 , Figure 3 directions shown are directly defined as the upper and lower directions.

[0030] As Figure 2 shown, the wiring module A of Example 1 is configured to include a pair of thin sheet members 10, a first transmission channel 20, a plurality of second transmission channels 30, a plurality of connectors 45, and a pair of noise shielding members 40. The wiring module A is mounted on the vehicle body (not shown). As the mounting object of the wiring module A in the vehicle body, there are a roof, a door panel, etc. The wiring module A is connected, for example, between an external antenna (not shown) mounted on the roof and an ECU (electronic control unit).

[0031] A pair of sheet members 10 are made of a flexible synthetic resin material. As the material of the sheet member 10, a resin material such as PVC (polyvinyl chloride) is used. As the resin material of the sheet member 10, a material with a relatively high welding strength to the sheath 27 of the following first transfer channel 20 and the insulation covering portion 32 of the second transfer channel 30 is selected. As Figure 1 shown, the sheet member 10 has a main line wiring portion 11 and branch line wiring portions 12 that project from the side edge portion of the main line wiring portion 11 in a branched manner. In the following description, for the sake of convenience, it is assumed that the sheet member 10 is arranged horizontally.

[0032] As Figure 2 shown, a first transfer channel 20 and a second transfer channel 30 are horizontally arranged between the upper and lower pair of sheet members 10. As Figure 1 shown, the first transfer channel 20 has a main line portion 21 arranged along the main line wiring portion 11 and a branch line portion 22 arranged along the branch line wiring portions 12. Although omitted in Figure 1 , the second transfer channel 30 also has a main line portion (omitted from illustration) arranged along the main line wiring portion 11 and a branch line portion (omitted from illustration) arranged along the branch line wiring portions 12.

[0033] The first transfer channel 20 is a conductive circuit of a communication circuit and is thus composed of a coaxial cable. As Figure 3 shown, the coaxial cable has a conductor 24, a cylindrical insulator 25 that surrounds the conductor 24, a shielding layer 26 made of a braided wire or the like that surrounds the outer periphery of the insulator 25, and a cylindrical sheath 27 that surrounds the shielding layer 26. The sheath 27 is made of PVC (polyvinyl chloride).

[0034] The first transfer channel 20, for example, transmits a signal received by an external antenna (omitted from illustration) installed on the vehicle roof to the ECU at a high speed of 1 Gbps or more. A high-frequency current of 1 GHz or more flows through the first transfer channel 20. The high-frequency current becomes a cause of the generation of common-mode noise and the like. Therefore, with regard to the first transfer channel 20, on the basis of using a coaxial cable as an electromagnetic noise countermeasure, a noise shielding member 40 is provided to further improve the reliability of the noise countermeasure.

[0035] As Figure 3 shown, the second transfer channel 30 is formed by surrounding the outer periphery of the core wire 31 with a cylindrical insulation covering portion 32. Similar to the sheath 27 of the first transfer channel 20, the insulation covering portion 32 is made of PVC (polyvinyl chloride). The second transfer channel 30 is used as a conductive circuit for power supply and the like. The second transfer channel 30 does not require electromagnetic noise countermeasures.

[0036] In the main-line wiring section 11 of the sheet member 10, the main-line section 21 of the first transfer channel 20 and the main-line section (not shown) of the second transfer channel 30 are arranged in parallel with each other. In the branch-line wiring section 12, the branch-line section 22 of the first transfer channel 20 and the branch-line section (not shown) of the second transfer channel 30 are arranged in parallel with each other, or only the branch-line section 22 of the first transfer channel 20 is provided, or only the branch-line section (not shown) of the second transfer channel 30 is provided.

[0037] The noise shielding member 40 is in the form of a flexible sheet. As Figure 1 shown, the noise shielding member 40 is elongated along the main-line section 21 and the branch-line section 22 of the first transfer channel 20 and branches in the middle. As Figure 3 shown, the noise shielding member 40 is successively laminated with a thin-film magnetic layer 41, a thin-film welding layer 42, and a thin-film protective layer 43. The magnetic layer 41 is sandwiched between the welding layer 42 and the protective layer 43. In addition, Figure 3 in, for the sake of easy explanation, the thicknesses of the magnetic layer 41, the welding layer 42, and the protective layer 43 are exaggeratedly depicted. Similar to the sheath 27 of the first transfer channel 20 and the insulating covering portion 32 of the second transfer channel 30, the welding layer 42 is made of PVC (polyvinyl chloride). The protective layer 43 is made of PET (polyethylene terephthalate).

[0038] When manufacturing the wiring module A, the first transfer channel 20 and the second transfer channel 30 are arranged on a horizontal jig (not shown) along a predetermined laying path, one sheet member 10 is placed thereon, and one noise shielding member 40 is placed thereon in an overlapping manner. At this time, the noise shielding member 40 is arranged only along the laying path of the first transfer channel 20. In this state, ultrasonic welding is performed. In the process of ultrasonic welding, the sheet member 10 is welded to the sheath 27 of the first transfer channel 20, the sheet member 10 is welded to the insulating covering portion 32 of the second transfer channel 30, and the welding layer 42 of the noise shielding member 40 is welded to the sheet member 10. The above welding is performed in one process.

[0039] Invert the first transfer channel 20, the second transfer channel 30, one sheet member 10, and one noise shielding member 40 so that the terrain as described above is integrated. Then, place the other sheet member 10 on top of the first transfer channel 20 and the second transfer channel 30, and place the other noise shielding member 40 on top of the sheet member 10 in an overlapping manner. At this time, the noise shielding member 40 is also arranged only along the laying path of the first transfer channel 20. After that, ultrasonic welding is performed in the same manner as above to join the first transfer channel 20, the second transfer channel 30, the other sheet member 10, and the other noise shielding member 40 to form them into one body. Thus, the wiring module A is completed.

[0040] The wiring module A of the first embodiment 1 includes the first transfer channel 20 and the sheet-like noise shielding member 40 arranged along the first transfer channel 20. Since the noise shielding member 40 is sheet-like, a smaller space is sufficient for arranging the noise shielding member 40. Thus, space saving can be achieved.

[0041] The thickness dimension of the magnetic layer 41 constituting the noise shielding member 40 is 100 μm to 600 μm. By setting the thickness to such a value, a high noise shielding effect can be obtained. If the thickness dimension of the noise shielding member 40 is set to 200 μm to 400 μm, an even higher noise shielding effect can be obtained.

[0042] The magnetic layer 41 constituting the noise shielding member 40 is obtained by dispersively mixing powders made of soft magnetic materials such as ferrite, electrolytic iron, and silicon iron in a synthetic resin. The complex magnetic permeability [μ] representing the magnetic properties of the magnetic material constituting the magnetic layer 41 is expressed as μ = μ' - jμ". Here, μ' is the real term (real part magnetic permeability) representing the property of concentrating magnetic flux. μ" is the imaginary term (imaginary part magnetic permeability) representing the property of attenuating magnetic flux. j represents the imaginary unit. Regarding the performance of noise suppression and noise shielding, it is effective if the magnetic loss component of the imaginary term μ" is high. The magnetic layer 41 uses magnetic loss to convert high-frequency electromagnetic noise into heat and make it disappear.

[0043] Figure 4 The curve diagram shows the magnetic properties of the magnetic material constituting the magnetic layer 41 of the first embodiment 1. In this curve diagram, the horizontal axis represents the frequency of the current flowing through the first transfer channel 20, with the unit of [MHz]. The vertical axis represents the values of the real term μ' and the imaginary term μ". As Figure 4As shown in the curve graph, the imaginary part of the complex permeability in the range of 1 GHz to 5 GHz is 5 or more, which is a magnetic property. The magnetic layer 41 with such magnetic properties absorbs electromagnetic noise emitted from the first transmission channel 20 by the magnetic loss of the magnetic material, and a higher noise shielding effect can be obtained. At a frequency of 1 GHz, when the imaginary part of the complex permeability of the magnetic material is 10 or more, a higher noise shielding effect can be obtained.

[0044] [Other Embodiments]

[0045] The present invention is not limited to the embodiments described above and illustrated in the drawings, but is shown by the claims. The present invention includes meanings equivalent to the claims and all modifications within the scope of the claims, and also intends to include the following embodiments.

[0046] In the above embodiment, a thin sheet member is interposed between the noise shielding member and the transmission channel, but the noise shielding member may also be directly joined to the transmission channel.

[0047] In the above embodiment, a sheet-like conductive circuit is formed by arranging a plurality of transmission channels along the thin sheet member, but the present disclosure can also be applied to a structure in which one noise shielding member is arranged along one transmission channel without using the thin sheet member.

[0048] In the above embodiment, the material of the sheath of the first transmission channel is PVC (polyvinyl chloride), but the material of the sheath may also be a material other than PVC.

[0049] In the above embodiment, the material of the welding layer of the noise shielding member is PVC (polyvinyl chloride), but the material of the welding layer may also be a material other than PVC.

[0050] Description of Reference Numerals

[0051] A... Wiring module

[0052] 10... Thin sheet member

[0053] 11... Main line wiring part

[0054] 12... Branch line wiring part

[0055] 20... First transmission channel (transmission channel)

[0056] 21... Main line part

[0057] 22... Branch line part

[0058] 24... Conductor

[0059] 25... Insulator

[0060] 26... Shielding layer

[0061] 27… Sheath

[0062] 30… Second transmission channel

[0063] 31… Core wire

[0064] 32… Insulation coating part

[0065] 40… Noise shielding component

[0066] 41… Magnetic layer

[0067] 42… Welding layer

[0068] 43… Protective layer

[0069] 45… Connector

[0070] μ… Complex permeability

[0071] μ’… Real part

[0072] μ”… Imaginary part

Claims

1. A wiring module, comprising: a first transmission channel and a second transmission channel arranged along a predetermined laying path; a noise shielding member arranged only along the laying path of the first transmission channel; and a sheet member, wherein the first transmission channel is constituted by a coaxial cable, the noise shielding member is in a sheet shape and is separated from the first transmission channel, the noise shielding member is overlapped on the sheet member, and the first transmission channel, the second transmission channel, the sheet member, and the noise shielding member are joined to form an integral body.

2. The wiring module according to claim 1, wherein, the noise shielding member contains a magnetic material having a magnetic property such that an imaginary part of a complex magnetic permeability at 1 GHz to 5 GHz is 5 or more.

3. The wiring module according to claim 2, wherein, the magnetic material has a magnetic property such that an imaginary part of a complex magnetic permeability at a frequency of 1 GHz is 10 or more.

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