Cable and power supply cable

Abstract

To provide a cable and a power supply cable having a new energy stabilizing structure and capable of suppressing the effects of external noise and supplying stable energy and signals.SOLUTION: This cable comprises: a plurality of conductors each covered with an insulator; a sheath bundling the plurality of conductors; and at least two sets of shielded conductive wire bundles each of which is a bundle of a plurality of conductive wires that have been subjected to insulation coating treatment, the two sets of shielded conductive wire bundles being separately coiled on the outer peripheral surface side of the sheath. At least one of the plurality of conductors is used as a shielded center wire. One end of the shielded conductive wire bundle of a first set is connected to a primary side of the conductor, and the other end of the shielded conductive wire bundle serves as a connection terminal for connection to a secondary-side ground wire. One end of the shielded conductive wire bundle of a second set is connected to the secondary side of the conductor, and the other end of the shielded conductive wire bundle serves as a connection terminal for connection to a primary-side ground wire.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to cables and power cables.

Background Art

[0002] Cables used for power cables, signal cables, etc. are known to include single-core cables with one conductor (also referred to as a core wire or a core) and multi-core cables with two or more conductors. These cables generally consist of a conductor coated with an insulator and a sheath covering one or more conductors.

[0003] Some cables are provided with a shield on the inner peripheral surface of the sheath covering the conductor as a countermeasure against external noise. The shield is generally formed of braided strands such as copper wires or aluminum wires, spiral windings such as copper tapes, and the like.

[0004] For example, in the case of power cables and signal cables for audio equipment, the influence of external noise is particularly manifested in the sound quality. Therefore, continuous improvements have been made to the shield structure that can suppress the influence of external noise and improve the sound quality. Of course, not limited to audio equipment, cables having internal conductors are affected by external noise, so improvements to the shield structure are also desired in other fields and applications.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been made based on such circumstances, and its object is to provide a cable and a power cable having an unprecedented energy stabilization structure, suppressing the influence of external noise, and capable of supplying stable energy and signals.

Means for Solving the Problems

[0007] The gist of the present invention is as follows. (1) The cable of the present invention includes a plurality of conductors each coated with an insulator, a sheath for bundling the plurality of conductors, and a bundle of a plurality of insulated wires each having an insulating film treatment. At least two sets of shield wire bundles are separately coiled on the outer peripheral surface side of the sheath. At least one of the plurality of conductors is used as a shield center line, one end of the first set of the shield wire bundles is connected to the primary side of the conductor, and the other end of the shield wire bundle is used as a connection end connected to the secondary side ground wire. One end of the second set of the shield wire bundles is connected to the secondary side of the conductor, and the other end of the shield wire bundle is used as a connection end connected to the primary side ground wire. (2) A braided shield is formed by braiding a plurality of sets of the shield wire bundles to cover the outer peripheral surface side of the sheath, and any two sets of the shield wire bundles among them are connected to the conductor serving as the shield center line. (3) The two sets of shield wire bundles are coiled in the same direction from the primary side to the secondary side and do not cross each other. (4) The power cable of the present invention includes a plurality of conductors each coated with an insulator, a sheath for bundling the plurality of conductors, and a bundle of a plurality of wires each coated with an insulating layer. At least two sets of shielded wire bundles are separately wound around the outer peripheral surface side of the sheath. At least one of the plurality of conductors is used as a shield center line. One end of the first set of the shielded wire bundles is connected to the primary side of the conductor, and the other end of the shielded wire bundle is connected to the ground wire on the connector side. One end of the second set of the shielded wire bundles is connected to the secondary side of the conductor, and the other end of the shielded wire bundle is connected to the ground wire on the power plug side. (5) The cable of the present invention includes a conductor coated with an insulator and a bundle of a plurality of wires each subjected to an insulating film treatment. At least two sets of shielded wire bundles are separately wound around the outer peripheral surface side of the conductor. The conductor is used as a shield center line. One end of the first set of the shielded wire bundles is connected to one end of the conductor, and one end of the second set of the shielded wire bundles is connected to the other end of the conductor.

Advantages of the Invention

[0008] According to the present invention, there is provided a bundle of a plurality of wires each subjected to an insulating film treatment, and at least two sets of shielded wire bundles are separately wound around the outer peripheral surface side of a sheath for bundling the plurality of conductors. For example, one of the conductors is used as a shield center line. One end of the first set of the shielded wire bundles is connected to the primary side of the conductor, and the other end of the shielded wire bundle is used as a connection end connected to the ground wire on the secondary side, and one end of the second set of the shielded wire bundles is connected to the secondary side of the conductor, and the other end of the shielded wire bundle is used as a connection end connected to the ground wire on the primary side. As a result, a novel energy stabilization structure can be realized. As a result, it is possible to provide a cable that can suppress the influence of external noise and supply stable energy and signals.

[0009] When this cable is used, for example, as a power cable or a signal cable for audio equipment, a high noise cut effect can be obtained, and it has been confirmed in actual tests that a sense of silence and a noise-free and stable sound quality can be obtained.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0011] Hereinafter, a cable and a power cable according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the technical scope of the present invention is not limited or construed in any way by the embodiments described below.

[0012] (First Embodiment) FIG. 1 shows a power cable 10 for audio equipment using a cable 1 according to the first embodiment. As a preferred example, the cable 1 uses a single-phase 100V three-core cable. However, it may be a single-core cable or a multi-core cable other than three-core. Also, it is not limited to single-phase 100V. The power cable 10 has a power plug 2 connected to the primary side of the cable 1 and a connector 21 connected to the secondary side. It has been confirmed by tests that this power cable 10 can suppress the influence of external noise and obtain a stable sound quality, and is suitable for use in audio equipment. However, the application is not limited, and it can be used for any equipment as a power cable for supplying power.

[0013] The power plug 2 in FIG. 1 shows, as an example, a grounded type insertion plug (grounded 2P) having two flat blades 22 and a ground 23, but it may be other types of plugs. For example, it may be a hook type or a locking type plug. Furthermore, not limited to type A which is widely used in the country, for example, considering use overseas, any one of type B, type C, type B3, type BF, type SE, type O, and type O2 may be selected. Similarly, for the connector 21, a connector of a type corresponding to the device may be selected. The connector 21 in FIG. 1 shows, as an example, a 3P female connector (IEC C13).

[0014] As particularly shown in FIGS. 2 and 3, the cable 1 is a circular three-core cable having three conductors 3 arranged inside. This cable 1 includes three conductors 3 each covered with an insulator 31, an intervening layer 32 as an intermediate sheath, a shield 33, an intermediate sheath 34, a shield 35, an intermediate sheath 36, a braided shield 37, and an overall sheath 38.

[0015] Each conductor 3 is formed of a highly conductive metal such as copper. It may be a stranded wire or a single wire. The material of the insulator 31 covering each conductor 3 is, for example, heat-resistant PVC or the like. The insulators 31 of the respective conductors 3 are color-coded, for example, in black, white, and red. The three conductors 3 covered with the insulator 31 are bundled so as to be radially positioned from the center of the cable 1 and are united with the intervening layer 32. That is, the intervening layer 32 is an example of a sheath for bundling a plurality of conductors. The material of the intervening layer 32 is, for example, PVC or the like. Note that the three conductors 3 may be bundled in parallel or may be bundled by twisting. Also, although a circular three-core cable is shown as a preferred example, a flat three-core cable in which the three conductors 3 are arranged in a row may be used.

[0016] The shield 33 is provided as the first shield between the outer peripheral surface of the intervening member 32 and the inner peripheral surface of the intermediate sheath 34. This shield 33 is, for example, a general horizontally wound shield using a metal such as a copper wire. The material of the intermediate sheath 34 is, for example, PVC or the like. The shield 35 is provided as the second shield between the outer peripheral surface of the intermediate sheath 34 and the inner peripheral surface of the intermediate sheath 36. This shield is, for example, a shield formed by winding a metal sheet such as a magnesium sheet in one direction, and is disclosed in detail in Japanese Patent No. 4282759 by the present inventor. The shields 33 and 35 may be other types of shields. Also, although it is desirable to have both the shield 33 and the shield 35, since it has the novel braided shield 37 described later, it is not necessarily required.

[0017] The braided shield 37 is provided as the third shield between the outer peripheral surface of the intermediate sheath 36 and the inner peripheral surface of the overall sheath 38. That is, the braided shield 37 is disposed on the outer peripheral surface side of the sheath (the intervening member 32 in this example) that bundles the three conductors.

[0018] The braided shield 37 is, in particular, as shown in FIG. 4, a shield braided with a plurality of conducting wires 4. However, the braided shield 37 of this embodiment has a different configuration from a general braided shield. First, each conducting wire 4 is subjected to an insulating coating treatment to be insulated from each other. This is a first attempt in the audio industry, and it prevents the occurrence of resistance and composite resonance. Then, it is braided with a bundle of a plurality of conducting wires 4 each having an insulating coating treatment (hereinafter referred to as "shield conducting wire bundle 41"). As an example, a bundle of 10 conducting wires 4 with an outer diameter of about 0.15 mm is taken as one set, and it is braided with 16 sets of shield conducting wire bundles 41. The size of the conducting wire 4 and the number of wires in one set may be changed as appropriate. The conducting wire 4 is, for example, a conductive metal wire such as a copper wire that has been subjected to an insulating coating treatment. The insulating coating is preferably a coating of an insulating material such as a urethane coating, for example. Further, painting may be applied thereon. When coloring or color-coding, for example, this painting is used. Further, the insulating coating treatment is not limited to a coating film of a liquid material, and an insulator may be used to cover it.

[0019] Second, at least two sets of shield conductor bundles 41 (41A, 41B) are grounded from among the multiple sets of shield conductor bundles 41 that constitute the braided shield 37. The two sets of shield conductor bundles 41A, 41B to be grounded are at least two sets of shield conductor bundles 41A, 41B that are separately coil-wound in a predetermined direction. In the example of FIG. 4, they are two of the three sets of shield conductor bundles colored black. These two sets of shield conductor bundles 41A, 41B are coil-wound in the same direction, spaced apart from each other, and parallel from the primary side to the secondary side of the cable 1. The direction of coil winding is preferably right-handed when viewed from the primary side, as it can cut noise and is suitable for countermeasures against external noise. Furthermore, coil-winding in parallel can cut noise and is suitable for countermeasures against external noise. However, they do not necessarily have to be precisely parallel as long as they do not cross each other.

[0020] Of the 16 sets of shield conductor bundles 41, 13 are colored white and 3 are colored black. This enhances the design of the cable 1 as shown in FIG. 4 and makes it easier to identify the shield conductor bundles 41A, 41B to be grounded. Of course, it is not limited to white and black. Therefore, the overall sheath 38 is formed of a transparent material. The material of the overall sheath 38 is, for example, transparent PVC. Note that FIGS. 1, 3, and 4 are taken with the overall sheath 38 removed.

[0021] Next, with reference to FIG. 5, a configuration for grounding two sets of shield conductor bundles 41A and 41B will be described in detail. First, in this embodiment, one of the three conductors 3 (conductor 3C) is used as the "shield center line". The other conductors 3A and 3B are used for power supply. The conductor 3C used as the shield center line is usually a conductor connected to the ground wires 23 and 24 of the power plug 2 and the connector 21. However, in this embodiment, by connecting this conductor 3C as follows, it is used as the "shield center line" serving as the energy reference. That is, one end (connection end) of the first set of shield conductor bundles 41A is connected to the primary side of the conductor 3C. The other end (connection end) of the first set of shield conductor bundles 41A is connected to the ground wire 24 of the connector 21. Then, one end (connection end) of the second set of shield conductor bundles 41B is connected to the secondary side of the conductor 3C. The other end (connection end) of the second set of shield conductor bundles 41B is connected to the ground wire 23 of the power plug 2. The primary side and the secondary side of the conductor 3C serving as the shield center line do not need to be connected to the ground wire 23 of the power plug 2 and the ground wire 24 of the connector 21. This is because connecting them would form a ground loop, and in the case of audio equipment, the sound would be muffled.

[0022] By configuring in this way, it has been confirmed in actual tests that a high-level noise-cutting effect can be obtained, and an unprecedented sense of silence and noise-free, stable sound quality can be obtained. That is, the shield conductor bundle 41 is composed of a bundle of wires 4 that are insulated from each other by an insulating coating process. Two sets of coil-wound shield conductor bundles 41A and 41B with the same IN and OUT are connected to one reference energy line (shield center line). When the two sets of coil-wound shield conductor bundles 41A and 41B are arranged in parallel, it has been confirmed that an unprecedented energy stabilization structure can be realized and a high-level noise-cutting effect can be obtained. The reason is presumably that it is easier to form photons and a zero ground field that are not affected by noise.

[0023] Note that the connection of the shield conductor bundles 41A and 41B to the conductor 3C, the ground wire 23 of the power plug 2, and the ground wire 24 of the connector 21 may be reversed.

[0024] (Second Embodiment) As shown in FIG. 6, this embodiment is a modified example in which two sets of shield conductor bundles 41A and 41B dropped to the ground are changed to shield conductor bundles 41A and 41C. Since the other configurations are the same as those in the first embodiment, detailed descriptions thereof are omitted. As shown in FIG. 6, in the cable 1 of the second embodiment, two sets of shield conductor bundles 41A and 41C wound in coils in different directions from the primary side to the secondary side of the cable 1 are dropped to the ground. That is, the first set of shield conductor bundles 41A is wound clockwise when viewed from the primary side, and the second set of shield conductor bundles 41C is wound counterclockwise when viewed from the primary side. Therefore, although there are partially intersecting portions, since each conductor 4 is subjected to an insulating coating treatment, resistance and composite resonance are prevented from occurring.

[0025] Also in this embodiment, one of the three conductors 3 (conductor 3C) is used as the "shield center line". Then, one end (connection end) of the first set of shield conductor bundles 41A is connected to the primary side of the conductor 3C. The other end (connection end) of the first set of shield conductor bundles 41A is connected to the ground wire of the connector 21. One end (connection end) of the second set of shield conductor bundles 41C is connected to the secondary side of the conductor 3C. The other end (connection end) of the second set of shield conductor bundles 41C is connected to the ground wire of the power plug 2. The primary side and the secondary side of the conductor 3C serving as the shield center line do not need to be connected to the ground wire 23 of the power plug 2 and the ground wire 24 of the connector 21. Even with such a configuration, although the effect is smaller compared to the first embodiment, it has been confirmed in actual tests that a higher noise cut effect can be obtained compared to the prior art.

[0026] Note that the connection of the shield conductor bundles 41A and 41C to the conductor 3C, the ground wire 23 of the power plug 2, and the ground wire 24 of the connector 21 may be reversed. Also, instead of the shield conductor bundle 41A, two sets of the shield conductor bundle 41B and the shield conductor bundle 41C may be connected in the same manner.

[0027] (Third Embodiment) As shown in FIG. 7, in this embodiment, as a modified example, one end (connection end) of four sets of shield conductor bundles 4 wound clockwise among a plurality of sets of shield conductor bundles 4 wound clockwise is connected to the secondary side of the conductor 3C, and the other end (connection end) is connected to the ground wire 23 of the power plug 2. In this case, a high noise cut effect can be obtained by increasing the area covering the surface of the cable 1, but the working efficiency is poor and a slight phase sense is felt to be poor. On the other hand, since the configuration of the first embodiment is simple and the same effect can be obtained, it has been concluded that it is the optimal configuration. As described above, the number of sets of shield conductor bundles 4 connected to the shield center line may be two or more. The plurality of sets are not limited to clockwise winding, and a plurality of sets of counterclockwise winding may be used.

[0028] Note that the connection of the shield conductor bundles 41A and 41B to the conductor 3C, the ground wire 23 of the power plug 2, and the ground wire 24 of the connector 21 may be reversed. Also, similar connection may be made with two sets of the shield conductor bundle 41A and the shield conductor bundle 41C as in the second embodiment.

[0029] As a comparative example, as shown in FIG. 8, when one of the three conductors (conductor 3C) was not used as the "shield center line", that is, when three sets of shield conductor bundles 41A, 41B, and 41C were connected in series and grounded, only a noise cut effect equivalent to that of a general braided shield was obtained.

[0030] Note that, although the above-described embodiment has been described by taking the power cable 10 as an example, it may be a signal cable. By using the cable 1, an energy stabilization structure can be realized, and an advanced noise cut effect can be obtained. Further, not limited to the three-core cable, the same effect can be obtained even with a single-core cable or a multi-core cable other than three cores (for example, a four-core cable or a three-core × three-core cable). Note that a conductor used as the shield center line may be provided separately. In that case, the diameter may be different from that of the other conductor 3. Further, the conductor used as the shield center line may be disposed outside the intervening member 32. In the case of the example of FIG. 2, for example, a conductor covered with an insulator is disposed between the intermediate sheath 34 and the intermediate sheath 36 to serve as the shield center line. In this case, the intermediate sheath 36 is an example of a sheath that bundles a plurality of conductors and has a shield conductor bundle 4 wound around the outer peripheral surface side thereof. Although one conductor is preferably used as the shield center line, two or more conductors may be used as the shield center line.

[0031] Based on the same principle, it can be expected that, for example, effects such as improving blood flow can be obtained by forming a bracelet or a necklace using the cable 1. In this case, a single-core cable is used, and the internal conductor is used as the shield center line. Then, one end (connection end) of the first set of shield conductor bundles 41A is connected to one end of the internal conductor, and one end (connection end) of the second set of shield conductor bundles 41B is connected to the other end of the internal conductor. The other end (connection end) of the first set of shield conductor bundles 41A and the other end (connection end) of the second set of shield conductor bundles 41B are made to touch the skin of the wearer.

[0032] As described above, according to the power cable 10 using the cable 1 of the present embodiment, it is possible to provide the cable 1 and the power cable 10 having a novel energy stabilization structure that has never existed before and capable of suppressing the influence of external noise and supplying stable energy and signals.

[0033] Although the present invention has been described in detail in accordance with specific embodiments, it will be apparent to those of ordinary skill in the art that various substitutions, modifications, changes, etc. in form and detail can be made without departing from the spirit and scope of the present invention as defined by the claims.

Description of Reference Numerals

[0034] 1 Cable 10 Power Cable 3 Conductor 31 Insulator 32 Intervening 37 Braided Shield 4 Insulation-Coated Conductive Wire 41 Shielded Conductor Bundle

Claims

1. A plurality of conductors each coated with an insulator, a sheath for bundling the plurality of conductors, a bundle of a plurality of conductor wires each subjected to an insulating film treatment, and at least two sets of shielded conductor bundles separately wound around the outer peripheral surface side of the sheath, using at least one of the plurality of conductors as a shield center line, A cable, wherein one end of the first set of the shielded conductor bundles is connected to the primary side of the conductor and the other end thereof is used as a connection end connected to the secondary side ground wire, and one end of the second set of the shielded conductor bundles is connected to the secondary side of the conductor and the other end thereof is used as a connection end connected to the primary side ground wire.

2. The cable according to claim 1, wherein a plurality of sets of the shielded conductor bundles are braided to form a braided shield covering the outer peripheral surface side of the sheath, and any two sets of the shielded conductor bundles among them are connected to the conductor serving as the shield center line.

3. The cable according to claim 1 or 2, wherein the two sets of shielded conductor bundles are wound in the same direction from the primary side to the secondary side and do not cross each other.

4. A plurality of conductors each coated with an insulator, a sheath for bundling the plurality of conductors, a bundle of a plurality of conductor wires each coated with an insulating layer, and at least two sets of shielded conductor bundles separately wound around the outer peripheral surface side of the sheath, using at least one of the plurality of conductors as a shield center line, A power cable, wherein one end of the first set of the shielded conductor bundles is connected to the primary side of the conductor and the other end thereof is connected to the ground wire on the connector side, and one end of the second set of the shielded conductor bundles is connected to the secondary side of the conductor and the other end thereof is connected to the ground wire on the power plug side.

5. A conductor coated with an insulator, a bundle of a plurality of conductor wires each subjected to an insulating film treatment, and at least two sets of shielded conductor bundles separately wound around the outer peripheral surface side of the conductor, using the conductor as a shield center line, A cable, wherein one end of the first set of the shielded conductor bundles is connected to one end of the conductor and one end of the second set of the shielded conductor bundles is connected to the other end of the conductor.

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