JP3624300B2 - Data transmission signal bundle and data transmission cable - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, DeMore specifically, the data transmission signal bundle and the data transmission cable have been improved so that the transmission of high-frequency noise components can be sufficiently suppressed.DeThe present invention relates to a data transmission signal bundle and a data transmission cable. It is particularly useful for SCSI (Small Computer System Interface) cables.
[0002]
[Prior art]
FIG. 14 is an explanatory diagram showing an example of a SCSI connection system using a conventional SCSI cable 900.
In the SCSI connection system C ′, the hard disk device HD is connected to the SCSI interface port of the personal computer P via the SCSI cable 900.
[0003]
FIG. 15 is a cross-sectional view showing a structural example of the SCSI cable 900.
As shown in FIG. 15 (a), this SCSI cable 900 is formed by winding a non-woven tape 90 in a spiral shape on the outer periphery of each arrangement position (indicated by dotted lines) A1, B1, B2,. In this configuration, an aluminum polyester tape 91 is wound around the outer periphery in a spiral shape, the outer periphery is covered with a braid 92 of tin-plated copper wire, and an insulating sheath 93 is formed on the outer periphery.
As shown in FIG. 15B, the twisted data transmission signal wire bundles in which the data transmission signal wire bundles 910A and 910B are twisted are arranged at the arrangement positions A1, B1 to B24.
As shown in FIG. 15 (c), the data transmission signal line bundle 910A (910B has the same configuration) is formed by bundling only seven data transmission signal lines 920 in which a tin plating layer 922 is formed on the outer periphery of the signal conducting wire 1. The insulating layer 3 is formed on the outer periphery.
[0004]
FIG. 16 is a graph showing the results of measuring the attenuation characteristics of the SCSI cable 900. The cable length of the SCSI cable 900 is 2 m.
From the graph, it can be seen that the attenuation is very small in the range of the frequency f = 0.3 to 100 MHz.
In addition, in the frequency range of f = 100 MHz to 500 MHz, the attenuation increases little by little as the frequency f increases, but even at 500 MHz, it is about 8 dB and is relatively small.
[0005]
FIG. 17 is an explanatory diagram showing another example of a SCSI connection system using the SCSI cable 900.
In the SCSI connection system C ″, an LC (Inductance-Capacitance) filter circuit 901 for removing high frequency noise components is built in the data input / output unit of the hard disk device HD ′.
[0006]
FIG. 18 is a graph showing the results of measuring the attenuation characteristics of the SCSI cable 900 with the LC filter circuit 901 attached.
From the graph, it can be seen that in the range of frequency f = 0.3 to 100 MHz, the attenuation characteristics are the same as those shown in FIG. 16, and the attenuation is relatively small.
In addition, in the range of the frequency f = 100 MHz to 250 MHz, the attenuation amount increases as the frequency f increases. On the other hand, in the frequency f = 250 MHz or higher, the attenuation amount decreases as the frequency f increases. If a numerical example is shown, the amount of attenuation when the frequency f = 250 MHz is about 12 dB, and the amount of attenuation when the frequency f = 500 is about 5 dB.
[0007]
[Problems to be solved by the invention]
In the conventional SCSI cable 900, as described with reference to FIG. 16, the attenuation amount for a high frequency of about 200 MHz or more is relatively small (about 8 dB even at 500 MHz). Therefore, there is a problem that high frequency noise components are easily transmitted. The high-frequency noise component is a harmonic component that leaks from, for example, an MPU (Microprocessor Unit) part of a personal computer.
Therefore, conventionally, it has been necessary to mount a high-frequency countermeasure component such as a ferrite core on the SCSI cable 900, resulting in an increase in cost and an inconvenience that the cable wire shape is broken.
[0008]
Further, when the LC filter circuit 901 is used, since the attenuation decreases as the frequency increases with a certain frequency (about 250 MHz in the example of FIG. 16) as a boundary, a very high frequency (for example, 1 GHz or more) ) Is difficult to sufficiently attenuate. In addition, there is a problem that the LC component may cause a high-frequency noise component to wrap around or adversely affect other circuits.
[0009]
Therefore, an object of the present invention is improved so that transmission of high-frequency noise components can be sufficiently suppressed while preventing adverse effects on others.DeAnother object is to provide a data transmission signal bundle and a data transmission cable.
[0010]
[Means for Solving the Problems]
In a first aspect, the present invention provides an outer periphery of a nonmagnetic signal conductor having a relatively low resistivity.Compared toA ferromagnetic metal layer with a relatively high resistivity was formed.A plurality of data transmission signal wires are bundled or twisted, and the outer periphery of the insulating layer of the data transmission signal wire bundle in which the insulating layer is formed on the outer periphery thereof is relatively arranged on the outer periphery of the nonmagnetic signal conductor having a relatively low resistivity. A data transmission signal line bundle characterized by forming a shield layer made of a lateral winding or braiding of a data transmission signal line on which a ferromagnetic metal layer having a high resistivity is formedI will provide a.
Data transmission signal line according to the first aspectData transmission signal line used for bundlesThen, the current of the frequency of the data signal (generally about several tens of Mz) is transmitted with low loss through the signal conductor having a relatively low resistivity.
On the other hand, a loss with respect to a high-frequency current (generally about 200 Mz or more) is increased, and a noise filter characteristic that attenuates a high-frequency noise component in the transmission path can be obtained. The reason why such characteristics can be obtained is that, due to the skin effect, high-frequency current tends to flow concentrated on the outer periphery of the nonmagnetic signal conductor, but the outer periphery of the nonmagnetic signal conductor has a relatively high resistivity. It is presumed that the high-frequency current is rapidly attenuated by the resistance loss of the ferromagnetic metal layer because the ferromagnetic metal layer having the same is formed. The reason why good characteristics can be obtained by limiting the metal layer to “ferromagnetic” is not clear, but it is presumed that magnetic coupling with the signal conductor is involved. In addition, it is presumed that “ferromagnetic” metals have a good influence due to their high shielding performance against high frequencies.
As a result, transmission of the high frequency noise component can be sufficiently suppressed while transmitting the data signal with low loss.
In addition, since there is no change in circuit, it is possible to prevent a high-frequency noise component from wrapping around and adverse effects on other circuits.
Furthermore, since the amount of attenuation in the transmission path increases as the frequency increases, it is possible to sufficiently attenuate a high frequency noise component having a very high frequency (for example, 1 GHz or more).
In the data transmission signal line bundle, since the aggregate of the data transmission signal lines having the above configuration is used as a data signal transmission path, the noise filter further reduces the transmission loss of the data signal and attenuates the high frequency noise component. The characteristics can be improved.
In the data transmission signal wire bundle according to the first aspect, the outer periphery of the data transmission signal wire bundle having the above configuration is provided with a relatively resistive ferromagnetic metal layer formed on the outer periphery. Since it is covered with a shield layer consisting of low non-magnetic conducting wire or braided, the data transmission signal wire bundle on the inner circumference side of the shield layer is shielded at a high frequency when viewed from the outside, and high-frequency electromagnetic radiation and high-frequency noise are shielded. Can be reduced.
[0011]
In a second aspect, the present invention provides a data transmission signal line configured as described above.bundleThe ferromagnetic metal layer is formed of pure iron, iron oxide, nickel, cobalt, chromium, an alloy including at least one of those materials, or a composite structure in which a plurality of the materials are combined. Characteristic signal line for data transmissionbundleI will provide a.
Data transmission signal line according to the second aspectbundleThen, any one of pure iron, iron oxide, nickel, cobalt, chromium, an alloy including at least one of these materials, and a composite structure in which a plurality of the above materials are combined is used as the ferromagnetic metal layer. The characteristics (properly magnetized property) can be obtained well and the resistivity can be sufficiently increased, so that excellent noise filter characteristics can be easily obtained.
[0012]
In a third aspect, the present invention provides a data transmission signal line configured as described above.bundleWherein the ferromagnetic metal layer has a thickness of 0.5 to 2.5 μm.bundleI will provide a.
Data transmission signal line according to the third aspectbundleThen, since the lower limit of the thickness of the ferromagnetic metal layer is set to 0.5 μm, it is possible to sufficiently increase the attenuation amount with respect to the high frequency current and sufficiently enhance the shielding performance against the high frequency. In addition, since the upper limit of the thickness of the ferromagnetic metal layer is set to 2.5 μm, the ferromagnetic metal layer can be easily formed in a short time by plating or the like, and the signal line for data transmission can be formed by the hard ferromagnetic metal layer. It can prevent that flexibility is impaired.
[0013]
In a fourth aspect, the present invention provides a data transmission signal line configured as described above.Data transmission cable characterized by bundling or twisting the bundles individually or mixedI will provide a.
For data transmission according to the fourth aspectIn the cable, a plurality of data transmission signal wire bundles having the above configuration are bundled or twisted to form a multi-core structure, so that parallel data transmission can be performed while sufficiently suppressing transmission of high-frequency noise components. Suitable for high speed.
[0014]
In a fifth aspect, the present invention provides a data transmission system having the above configuration.A ferromagnetic metal layer having a relatively high resistivity is formed on the outer periphery of the nonmagnetic signal conductor having a relatively low resistivity on the outer periphery of the cable.For data transmission, characterized by forming a shield layer consisting of horizontal winding or braiding of data transmission signal linescableI will provide a.
For data transmission according to the fifth aspectIn the cable, the outer periphery of the data transmission cable having the above-described configuration is covered with a shield layer made of a non-magnetic conductive wire plated with a ferromagnetic metal, or a shield layer made of a braid. Can be shielded at a high frequency when viewed from the outside, and high-frequency electromagnetic radiation and high-frequency noise pick-up can be reduced. In particular, when the data transmission signal line bundle according to the fifth aspect is used, the data transmission signal line is shielded by the double shield layer, so that high-frequency electromagnetic radiation and high-frequency noise are picked up. It can be further reduced.
[0015]
In a sixth aspect, the present invention provides:Data in which a plurality of data transmission signal lines in which a ferromagnetic metal layer having a relatively high resistivity is formed on the outer periphery of a nonmagnetic signal conductor having a relatively low resistivity are bundled or twisted and an insulating layer is formed on the outer periphery thereof A bundle of signal wires for transmission is bundled or twisted, a non-woven tape is wound around the outer periphery, an aluminum polyester tape is wound around the outer periphery, and the outer periphery of the nonmagnetic signal conductor having a relatively low resistivity is relatively wound around the outer periphery. A data transmission cable comprising a shield layer made of horizontal winding or braiding of a data transmission signal line on which a ferromagnetic metal layer having a high resistivity is formedI will provide a.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings. Note that the present invention is not limited thereby.
[0018]
-First embodiment-
FIG. 1 illustrates the present invention.Used for signal transmission signal bundleOf data transmission signal lineOne caseFIG.
The data transmission signal line 100 has a configuration in which a ferromagnetic metal plating layer 2 having a relatively high resistivity is formed on the outer periphery of the nonmagnetic signal conducting wire 1 having a relatively low resistivity. The material of the nonmagnetic signal conducting wire 1 is, for example, copper (resistivity at room temperature = 1.72 μΩ · cm or so). The material of the ferromagnetic metal plating layer 2 is, for example, pure iron (resistivity at room temperature = 10.0 μΩ · cm or so). Instead of pure iron, iron oxide, nickel, cobalt, chromium, or an alloy containing them may be used. The diameter φ of the nonmagnetic signal conducting wire 1 is, for example, 0.127 mm. A thickness τ of the ferromagnetic metal plating layer 2 is, for example, 0.5 to 2.5 μm.
According to the data transmission signal line 100 described above, noise filter characteristics that attenuate high-frequency noise components can be obtained. Therefore, transmission of high-frequency noise components (for example, about 200 MHz or more) can be sufficiently suppressed, and data transmission errors can be reduced. I can do it.
[0019]
FIG.Of the present inventionUsed for signal transmission signal bundleOf data transmission signal lineOther examplesFIG.
This data transmission signal line 200 has a composite structure in which a pure iron plating layer 2a is formed on the outer periphery of the nonmagnetic signal conducting wire 1 having a relatively low resistivity, and a nickel plating layer 2b is formed on the outer periphery by flash plating. is there.
According to the data transmission signal line 200 described above, since the pure iron plating layer 2a is protected by the nickel plating layer 2b, the pure iron plating layer 2a is hardly rusted and deterioration of characteristics over time can be reduced.
[0020]
According to the data transmission signal line 200 described above, since the pure iron plating layer 2a is protected by the nickel plating layer 2b, the pure iron plating layer 2a is hardly rusted and deterioration of characteristics over time can be reduced.
[0021]
FIG.IsUsing the data transmission signal line 100It is sectional drawing which shows the structure of the signal wire bundle for data transmission.
The data transmission signal wire bundle 300 is formed by forming the data transmission signal wire 100 of FIG. 1 (a ferromagnetic metal plating layer 2 having a relatively high resistivity on the outer periphery of the nonmagnetic signal conducting wire 1 having a relatively low resistivity). 7) are bundled or twisted together, and the insulating layer 3 is formed on the outer periphery thereof.
According to the data transmission signal line bundle 300 described above, a plurality of data transmission signal lines 100 are bundled or twisted to form an assembly line or a stranded line, so that transmission loss for the data signal is further reduced and high frequency noise components are reduced. The noise filter characteristics to be attenuated can be improved.
[0022]
FIG.Of the present invention1It is sectional drawing which shows the structure of the signal wire bundle for data transmission concerning this embodiment.
The data transmission signal wire bundle 400 is arranged on the outer periphery of the data transmission signal wire bundle 300 in FIG. 3 (a plurality of data transmission signal wires 100 in FIG. 1 are bundled or twisted to form the insulating layer 3 on the outer periphery thereof). The shield layer 41 is formed.
The shield layer 41 has a relatively high resistivity ferromagnetic metal plating layer (for example, pure iron layer) on the outer periphery of a non-magnetic conductive wire (for example, copper wire; corresponding to 1 in FIG. 1) having a relatively low resistivity. 1 (corresponding to 2 in FIG. 1) is formed (the same configuration as the data transmission signal line 100 in FIG. 1), or a horizontal winding or a braid.
According to the data transmission signal wire bundle 400 described above, the outer periphery of the data transmission signal wire bundle 300 is covered with the shield layer 41 made of a non-magnetic conductive wire that is plated with a ferromagnetic metal, or is shielded. The signal line bundle 300 can be shielded at a high frequency when viewed from the outside, and high-frequency electromagnetic radiation and high-frequency noise pick-up can be reduced.
[0023]
-No.2Embodiment of
FIG. 5 shows the first aspect of the present invention.2It is sectional drawing which shows the structure of the cable for data transmission concerning embodiment of this.
The data transmission cable 500 is formed by bundling or twisting a plurality of data transmission signal wire bundles 400 shown in FIG. 4 (a shield layer 41 formed on the outer periphery of the data transmission signal wire bundle 300 shown in FIG. 3), and insulating the outer periphery thereof. In this configuration, the layer 51 is formed.
According to the data transmission cable 500 described above, a plurality of data transmission signal wire bundles 400 are bundled or twisted to form a multi-core structure, so that parallel data transmission can be performed while sufficiently suppressing transmission of high-frequency noise components. Therefore, it is possible to cope with high speed data transmission.
[0024]
-No.3Embodiment of
FIG. 6 shows the first aspect of the present invention.3It is sectional drawing which shows the structure of the cable for data transmission concerning embodiment of this.
The data transmission cable 600 has a shield layer on the outer periphery of the data transmission cable 500 in FIG. 5 (a plurality of data transmission signal wire bundles 400 in FIG. 4 are bundled or twisted to form the insulating layer 51 on the outer periphery thereof). 61 is formed.
The shield layer 61 has a relatively high resistivity ferromagnetic metal plating layer (for example, pure iron layer) on the outer periphery of a non-magnetic conductive wire (for example, copper wire; corresponding to 1 in FIG. 1) having a relatively low resistivity. 1 (corresponding to 2 in FIG. 1) is formed (the same configuration as the data transmission signal line 100 in FIG. 1), or a horizontal winding or a braid.
According to the data transmission cable 600 described above, the outer periphery of the data transmission cable 500 is covered with the shield layer 61 made of a non-magnetic conductive wire that is plated with a ferromagnetic metal, or a shield layer 61 made of a braid. The wire bundle 400 is shielded in high frequency when viewed from the outside (the data transmission signal wire bundle 300 is doubly shielded by the shield layers 41 and 51) to further reduce high-frequency electromagnetic radiation and high-frequency noise pickup. I can do it.
[0025]
−Reference example−
FIG.Reference exampleIt is sectional drawing which shows the structure of the SCSI cable 700 concerning. Generally, the number of signal lines of a SCSI cable is 25 pairs (50).
As shown in FIG. 7A, this SCSI cable 700 is formed by winding a nonwoven fabric tape 90 in a spiral shape around the outer periphery of each of the arrangement positions (indicated by dotted lines) A1, B1, B2,. In this configuration, an aluminum polyester tape 91 is wound around the outer periphery in a spiral shape, the outer periphery is covered with a braid 92 of tin-plated copper wire, and an insulating sheath 93 is formed on the outer periphery. For example, the tin-plated copper wire is obtained by tin-plating the outer periphery of a copper wire having a strand diameter of 0.1 mm.
As shown in FIG. 7B, the twisted data transmission signal wire bundles in which the data transmission signal wire bundles 300A and 300B are twisted are arranged at the arrangement positions A1, B1 to B24. The configuration of the data transmission signal line bundle 300A, 300B is the same as that of the data transmission signal line bundle 300 (see FIG. 3) according to the third embodiment. That is, as shown in FIG. 7 (c), the data transmission signal line bundle 300A (300B has the same configuration) has a relatively low resistivity on the outer periphery of the nonmagnetic signal conducting wire 1 having a relatively low resistivity. Only seven data transmission signal lines 100 (see FIG. 1) on which a high ferromagnetic metal plating layer 2 is formed are bundled or twisted, and an insulating layer 3 is formed on the outer periphery thereof. The nonmagnetic signal conducting wire 1 is, for example, a copper wire having a diameter φ = 0.127 mm. The ferromagnetic metal plating layer 2 is pure iron having a thickness τ = 0.5 to 2.5 μm, for example.
[0026]
FIG. 8 is a configuration diagram showing an attenuation characteristic measurement system SG for measuring the attenuation characteristic of the SCSI cable 700. As shown in FIG.
In this attenuation characteristic measurement system SG, both ends of the data transmission signal wire bundles 300A and 300B at the measurement target position (for example, B12) of the SCSI cable 700 are respectively connected via balun transformers (BALance to UNbalance transformer) TR1 and TR2. The configuration is connected to the network analyzer A. Note that one end of the data transmission signal wire bundles 300A and 300B that are not to be measured (other than B12) was opened, and the other ends were all short-circuited to the braiding 92 of the tin-plated lead wire.
Instead of the network analyzer A, a gain / phase analyzer may be used.
[0027]
9 to 11 are graphs showing measurement results by the attenuation characteristic measurement system SG of FIG. The cable length of the SCSI cable 700 is 2 m. The characteristic concerning the SCSI cable 700 is shown by a solid line. As a first comparative example, the characteristics (see FIG. 16) according to the conventional SCSI cable 900 are indicated by dotted lines. As a second comparative example, the characteristics (see FIG. 18) concerning the SCSI cable 900 equipped with the LC filter circuit 901 are indicated by a one-dot chain line.
FIG. 9 shows the measurement results for the thickness τ = 0.5 μm of the ferromagnetic metal plating layer 2 (see FIG. 7). From the graph, it can be seen that the amount of attenuation when the frequency f is about 100 MHz or more is larger than that of the first comparative example. Moreover, it turns out that the attenuation amount more than about frequency f = 350MHz becomes larger than a 2nd comparative example. Incidentally, the attenuation when f = 500 MHz is about 14 dB (about 6 dB larger than the first comparative example and about 9 dB larger than the second comparative example).
FIG. 10 shows the measurement results for the thickness τ = 1.0 μm. From the graph, it can be seen that the attenuation when the frequency f is about 100 MHz or more is larger than when τ = 0.5 μm. Incidentally, the attenuation when f = 500 MHz is about 21 dB (about 13 dB larger than the first comparative example and about 16 dB larger than the second comparative example).
FIG. 11 shows the measurement results for the thickness τ = 1.5 μm. From the graph, it can be seen that the amount of attenuation when the frequency f is about 100 MHz or more is larger than when τ = 1.0 μm. Incidentally, the attenuation when f = 500 MHz is about 29 dB (about 21 dB larger than the first comparative example and about 24 dB larger than the second comparative example).
In the SCSI specification, the frequency of the data signal is about several tens of MHz. Therefore, in any of the characteristics shown in FIGS. 9 to 11, the attenuation is sufficiently small for the data signal. On the other hand, the amount of attenuation increases for a high frequency of about 200 MHz or higher.
[0028]
FIG. 12 is an explanatory diagram showing a SCSI connection system using the SCSI cable 700.
In this SCSI connection system C, the hard disk device HD is connected to the SCSI interface port of the personal computer P via the SCSI cable 700. Other hard disk devices, MO (Magnetic Optical) disk devices, CD-ROMs (Compact Disk Read Only Memory), scanner devices, and other SCSI-compliant devices are further connected via another SCSI cable 700. Sometimes.
As described above with reference to FIGS. 9 to 11, the SCSI cable 700 has a large attenuation with respect to a high frequency of about 200 MHz or more, and therefore it is not necessary to mount a high frequency countermeasure component such as a ferrite core.
[0029]
According to the above SCSI cable 700, since the data transmission signal line 100 in which the ferromagnetic metal plating layer 2 is formed on the outer periphery of the nonmagnetic signal conducting wire 1 is used, transmission of high frequency noise components of about 200 MHz or more is sufficiently suppressed. Data transmission errors can be reduced. Therefore, it is not necessary to mount high-frequency countermeasure parts, the cost can be reduced, and an appearance that does not damage the cable wire type can be achieved.
[0030]
-No.4Embodiment of
FIG. 13 shows the first aspect of the present invention.4It is sectional drawing which shows the structure of the SCSI cable 800 concerning embodiment of this.
As shown in FIG. 13A, this SCSI cable 800 is formed by winding a nonwoven fabric tape 90 in a spiral shape around the outer periphery of each of the arrangement positions (indicated by dotted lines) A1, B1, B2,. The aluminum polyester tape 91 is spirally wound around the outer periphery, the outer periphery is covered with a shield layer 81, and the insulating sheath 93 is formed on the outer periphery.
The shield layer 81 has a relatively high resistivity ferromagnetic metal plating layer (for example, pure iron layer) on the outer periphery of a nonmagnetic conductive wire (for example, copper wire; corresponding to 1 in FIG. 1) having a relatively low resistivity. 1 (corresponding to 2 in FIG. 1) is formed (the same configuration as the data transmission signal line 100 in FIG. 1), or a horizontal winding or a braid.
As shown in FIG. 13B, the twisted data transmission signal wire bundles in which the data transmission signal wire bundles 300A and 300B are twisted are arranged at the arrangement positions A1, B1 to B24. The configuration of the data transmission signal line bundle 300A, 300B is the same as that of the data transmission signal line bundle 300 (see FIG. 3) according to the third embodiment. That is, as shown in FIG. 13 (c), the data transmission signal wire bundle 300A (300B has the same configuration) has a relatively low resistivity on the outer periphery of the nonmagnetic signal conducting wire 1 having a relatively low resistivity. Only seven data transmission signal lines 100 (see FIG. 1) on which a high ferromagnetic metal plating layer 2 is formed are bundled or twisted, and an insulating layer 3 is formed on the outer periphery thereof.
[0031]
According to the above-described SCSI cable 800, the outer peripheral side of the cable is covered with the shield layer 81 made of a non-magnetic conductive wire plated with a ferromagnetic metal or shielded, so that high-frequency electromagnetic radiation and high-frequency noise are picked up. Can be reduced.
[0032]
【The invention's effect】
The present inventionDeAccording to the data transmission signal line bundle and the data transmission cable, the filter characteristic that attenuates the high frequency can be given to the signal line, the signal line bundle, and the cable itself, so that the stability and reliability of the data transmission can be improved. . In addition, the ferromagnetic metal layer formed on the outer periphery of the non-magnetic signal conductor has high-frequency shielding ability, so it can reduce high-frequency electromagnetic radiation and high-frequency noise pickup, It can easily meet the regulations of VCCI (Voluntary Control Council for Interference data processing equipment and electronic office machines).
In addition, high frequency countermeasure parts such as a ferrite core can be eliminated, thereby reducing the cost.
[Brief description of the drawings]
FIG. 1 of the present inventionUsed for signal transmission signal bundleData transmission signal lineExampleFIG.
FIG. 2 of the present inventionUsed for signal transmission signal bundleData transmission signal lineOther examplesFIG.
[Fig. 3]1 and 2 using the data transmission signal lineIt is sectional drawing of the signal wire bundle for data transmission.
FIG. 4 shows the first of the present invention.1It is sectional drawing of the signal wire bundle for data transmission concerning this embodiment.
FIG. 5 shows the first of the present invention.2It is sectional drawing of the cable for data transmission concerning embodiment of this.
FIG. 6 shows the first of the present invention.3It is sectional drawing of the cable for data transmission concerning embodiment of this.
[Fig. 7]Reference exampleIt is sectional drawing which shows a SCSI cable.
8 is a configuration diagram showing an attenuation characteristic measurement system for measuring the attenuation characteristic of the SCSI cable of FIG. 7; FIG.
9 is a graph showing measurement results obtained by the attenuation characteristic measurement system of FIG.
10 is another graph showing measurement results obtained by the attenuation characteristic measurement system of FIG. 8. FIG.
FIG. 11 is still another graph of measurement results obtained by the attenuation characteristic measurement system of FIG. 8;
12 is an explanatory diagram of a SCSI connection system using the SCSI cable of FIG. 7;
FIG. 13 shows the first of the present invention.4It is sectional drawing which shows the SCSI cable concerning embodiment of this.
FIG. 14 is an explanatory diagram showing an example of a SCSI connection system using a conventional SCSI cable.
FIG. 15 is a cross-sectional view showing an example of the structure of a conventional SCSI cable.
16 is a graph showing attenuation characteristics of the SCSI cable of FIG.
17 is an explanatory diagram showing another example of a SCSI connection system using the SCSI cable of FIG. 15;
FIG. 18 is a graph showing the attenuation characteristics of a SCSI cable equipped with an LC filter circuit.
[Explanation of symbols]
100, 200 Data transmission signal line
300, 300A, 300B 400 Data transmission signal wire bundle
500,600 Data transmission cable
700,800 SCSI cable
1 Nonmagnetic signal conductor
2 Ferromagnetic metal plating layer
2a Pure iron plating layer
2b Nickel plating layer
3,51 Insulation layer
41, 61, 81 Shield layer
92 Braiding of tinned copper wire
93 Insulation sheath

Claims (6)

Data in which a plurality of data transmission signal lines in which a ferromagnetic metal layer having a relatively high resistivity is formed on the outer periphery of a nonmagnetic signal conductor having a relatively low resistivity are bundled or twisted and an insulating layer is formed on the outer periphery thereof From the lateral winding or braiding of a data transmission signal line in which a ferromagnetic metal layer having a relatively high resistivity is formed on the outer periphery of a nonmagnetic signal conductor having a relatively low resistivity on the outer periphery of the insulating layer of the transmission signal line bundle A signal transmission line bundle for data transmission, characterized in that a shield layer is formed. 2. The data transmission signal bundle according to claim 1, wherein the ferromagnetic metal layer includes pure iron, iron oxide, nickel, cobalt, chromium, an alloy including at least one of these materials, and a composite of a plurality of the materials. A signal transmission wire bundle characterized by being formed of any one of the structures. 3. The data transmission signal wire bundle according to claim 1, wherein the ferromagnetic metal layer has a thickness of 0.5 to 2.5 [mu] m. Data transmission cable, characterized in that the data transmission signal line bundle tailored or twisted bundle each or as a mixture according to any one of claims 1 to 3. 5. A horizontal winding of a data transmission signal line in which a ferromagnetic metal layer having a relatively high resistivity is formed on the outer periphery of a nonmagnetic signal conductor having a relatively low resistivity on the outer periphery of the data transmission cable according to claim 4 Alternatively, a data transmission cable having a shield layer formed of a braid. Data in which a plurality of data transmission signal lines in which a ferromagnetic metal layer having a relatively high resistivity is formed on the outer periphery of a nonmagnetic signal conductor having a relatively low resistivity are bundled or twisted and an insulating layer is formed on the outer periphery thereof A bundle of transmission signal wires is bundled or twisted, a non-woven tape is wound around the outer periphery, an aluminum polyester tape is wound around the outer periphery, and the outer periphery of the nonmagnetic signal conductor having a relatively low resistivity is relatively wound around the outer periphery. A data transmission cable, characterized in that a shield layer made of horizontal winding or braiding of a data transmission signal line on which a ferromagnetic metal layer having a high resistivity is formed is formed.

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