JP2008078057A - Shielded line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that, in an insulation structure of conventional shielded wires, insulators of the same kind and the same quality are continued along the surface of conductive wires in a conductive wire axis direction, so that dielectric distortions specific to a dielectric is integrated by the insulators and charge energy caused by the dielectric distortions flow into a wire line with an elapse of time, and, as a result, line dynamic characteristics are deteriorated. <P>SOLUTION: As shown in Fig.3, a plurality of insulators of different kinds and different qualities are divided for use along a shielded line axis direction to cut off continuity of the insulators, as a result of which, a total volume of dielectric distortions of the insulators is decreased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a shielded wire insulation structure.

Conventionally, as a method of insulating a shielded wire core wire, a method of insulating with a homogeneous insulator of the same kind along the core wire axis direction has been taken. As is well known, the line characteristic changes due to the characteristic of the insulator that insulates the core wire. An insulator having a small relative dielectric constant and dielectric loss angle has been used or developed and used for a shielded wire. A method of insulating with a plurality of insulators in the direction perpendicular to the core axis is also widely known. There has been no method for improving line characteristics by means of insulating a core wire by alternately adhering a plurality of different or different insulators along the shield wire core axis direction like the shield wire of the present invention.

In addition, there is a shield wire in which the outer periphery of the shield part is insulated with the same kind of insulator along the shield wire axis direction. With shielded wires, it has been known that changes in line dynamics occur depending on the type and nature of the insulation. Also, multiple different or different types of insulation are used in the direction perpendicular to the shield wire axis, and the outer periphery of the shield is Insulating methods are also known. There is no method for improving the line characteristics by means of insulating the outer periphery of the shield part by alternately adhering a plurality of different or different insulators along the shield wire shield part axial direction like the shield wire of the present invention. .

Furthermore, there has been no method for improving line characteristics using an insulation structure that satisfies both 0002 and 0003 descriptions for insulation of the core wire and the outer periphery of the shield portion along the shield wire axis direction.
JP 2003-77347 A Japanese Patent No. 3753431

An electric field is generated when a voltage is applied to the shield core wire and the shield part. An insulator that insulates a core wire that is a dielectric in an electric field is subjected to tensile strain in the direction of the electric field and pressure strain in a direction perpendicular to the electric field. Dielectric strain is transmitted over time to the entire insulator along the continuous core axis direction, and dielectric strain also occurs in the entire core insulator of the shielded wire. The charge energy in the insulator due to the dielectric strain flows to the conductive wire over time, resulting in degradation of the line dynamic characteristics of the shielded wire. The same applies to the 2-core shielded wire.

When transmitting an audio signal with a shielded wire For example, when a CD player and an amplifier are connected, the ground potentials of the two grounds fluctuate with each other. Therefore, the same phenomenon as described in 0005 occurs in the insulator that insulates the outer periphery of the shield portion of the shield wire. The same applies to the 2-core shielded wire.

Charge energy resulting from dielectric distortion described in 0005 and 0006 flows to the line over time, and both are closely related to each other and degrade the line dynamic characteristics of the shield line. For example, the dielectric strain generated in the core wire insulator is transmitted to the shield portion outer periphery insulator through the shield portion, and both have a close relationship with each other. The same applies to the 2-core shielded wire.

The shield wire of the present invention is intended to solve the problem described in 005. Therefore, an insulator that insulates the shield core wire is in close contact with a plurality of insulators that are different or heterogeneous along the shield wire axis direction. An object of the present invention is to provide a shielded wire characterized by a shielded wire axially divided insulating structure having the structure of FIG.

In order to solve the problem described in 006, the shield wire of the present invention is intended to solve the problem described in 006, so that the insulator that insulates the outer periphery of the shield wire shield part is in close contact with a plurality of insulators that are different or heterogeneous along the shield wire axis direction The shield wire is characterized by having a shield wire axially divided insulation structure having the structure of FIG. 2 that insulates the outer periphery of the shield wire shield portion.

In order to solve the problem described in 007, the shield wire of the present invention provides a shield wire characterized by a shield wire axially divided insulation structure having the insulation structure of FIG. It is something to try.

As shown in FIG. 1, the shield wire of the present invention solves the problem described in 005 by means of a shielded wire axially divided insulation structure in which a plurality of insulators of different types or different types are alternately adhered along the shield wire core axis direction. .

As shown in FIG. 2, the shield wire according to the present invention has the problem described in 006 by means of a shielded wire axially divided insulation structure in which a plurality of insulators are alternately or differently arranged around the shield portion along the shield wire axial direction. Settled.

As shown in FIG. 3, the shield wire according to the present invention has a shield wire axially divided insulation structure in which a plurality of insulators of different or different kinds along the shield wire axial direction are insulatively adhered to each other as shown in FIG. Solved the problem described in 007.

The following description is based on the assumption of a dielectric distortion phenomenon that occurs in an insulator that is a dielectric in an alternating electric field.

It has been well known from the past that in all shielded wires, the dynamic characteristics of the shielded wires change due to the characteristics of the insulator, which is a dielectric. For example, when it is used for transmission lines that transmit audio signals, phenomena such as degradation of the audible resolution occur, and one of the factors that changes the dynamic characteristics is the dielectric caused by dielectric distortion generated in the insulator in the electric field. This is largely due to the result that the charge energy of the body flows into the track over time.

Conventionally, in order to insulate the shield wire, an insulation method using an insulator of the same kind or the same quality has been taken along the axial direction of the shield wire core line. When the surface of the core wire is insulated with the same kind of insulator, the dielectric strain generated in the insulator, which is a dielectric in the electric field, is transmitted to the entire insulator over time. The same phenomenon also occurs in the insulator that insulates the outer periphery of the shielded wire shield part.

In the well-known Maxwell's strain force theory, it has been well known that, in an insulator that is a dielectric in an electric field, the insulator is subjected to tensile strain in the direction of the electric field and pressure strain in the direction perpendicular to the electric field. It is a fact that. This tension and pressure are collectively referred to as Maxwell's stress.

For the following explanation, the strain including the tension strain and pressure strain described in 0017 is defined as dielectric strain.

According to Maxwell's electromagnetic field theory in an electric field, each law in an elastic body is applied to a phenomenon in which dielectric strain is transmitted in the electric field, so that the dielectric strain generated at an arbitrary point is in the electric field. It is transmitted over time to the entire insulator in the shield wire core axis direction. When an audio signal having positive / negative asymmetrical characteristics and no periodicity is transmitted, it appears as a resolution degradation in the sense of hearing.

When a voltage is applied to a shielded wire of length L, the dielectric strain generated at any point is the same as when the force is transmitted in the elastic body in the insulator in the axial direction of the shielded wire core where the insulator is continuous. It is transmitted over time to the entire insulator in the electric field. This dielectric distortion also occurs in the entire insulator used for the shielded wire.

Therefore, assuming that there is no saturation in dielectric distortion, the amount of dielectric distortion in the insulator increases in proportion to the line length as the shield line length increases for relatively short lines. It is easy to guess that there are few and long. For example, the amount of change in sound when the shielded wire is used for a signal cable or the like that is an audio signal transmission line is not inconsistent with a phenomenon that is approximately proportional to the length of the shielded wire.

When expressing the dielectric strain amount in the shielded wire of the line length L, when the line length is plotted on the horizontal axis and the dielectric strain amount is plotted on the vertical axis, the dielectric strain amount increases with respect to the line length. If the angle is θ, the dielectric distortion amount at the end of the line is (tan θ × L). Therefore, the total amount of dielectric strain in the insulator is the area of the triangle in the graph, which is (1/2) × (tan θ × L) × L. The increase angle θ is determined by the nature of the insulator.

In order to reduce the total amount of dielectric distortion in the line length L described in 0022, the method of interrupting the continuity of the insulator is the most reliable and effective method.

Accordingly, in the concept described in 0021, 0022, and 0023, for example, when considering the total amount of dielectric strain in the insulator having the structure of FIG. 1 in which the core insulator is divided into three, the area of one unit length is 2 of the length. Inversely proportional to the power (1/9), since the required line length requires 3 units, (1/9) × 3 = (1/3) times.

As shown in FIG. 1, for the purpose of interrupting the continuity of the insulator, if the insulator D having the property that the dielectric property of the shielded wire core insulator in the electric field is difficult to transmit the dielectric strain force is arranged, The continuity of the insulator A will be cut off. However, there is no insulator D that can be completely cut off, and it is necessary to select and use an insulator having a high blocking effect according to the intended use of the line.

The concept described in 0015 to 0025 is similarly applied to the insulator that insulates the outer periphery of the shield part of the shielded wire, and the shielded wire axially divided insulating structure of the present invention is effective as shown in FIG. is there

Furthermore, the dielectric strain generated in the core wire insulator and the shield outer peripheral insulator has a close relationship with each other. For example, the dielectric strain generated in the core wire insulator is transmitted through the shield portion to the shield outer peripheral insulator over time. The two do not exist independently. If the insulation structure that insulates the core wire and the outer periphery of the shield portion is used, the effectiveness of the axially divided insulation structure is further enhanced.

0022, 0023, and 0024 are descriptions for explaining the technical idea of the shielded wire according to the present invention, and it is impossible for the insulators C and D to completely block the dielectric distortion in the existing insulators. Insulator C and insulator D also cause dielectric distortion. For example, in the case of a line that mainly transmits an audible frequency band signal, the concept described in 0024 is extremely effective if paraffin paper that is heat-sealed is used. It is effective, and it is possible to reduce the total amount of dielectric distortion and to reduce the degradation of the shield line dynamic characteristics.

The insulation structure of the shield wire of the present invention will be described. 1, 2, and 3, the spacing and length of the insulator A, the insulator D, the insulator B, and the insulator C are not specified, and the position of the shield wire in the axial direction is not specified. The technical idea of the present invention is an insulating structure in which a plurality of insulators of different types or different types are in close contact with each other in the direction and are arranged separately.

When the shield wire of the present invention is actually used for an audio signal transmission line or the like for transmitting a signal having a periodicity that is not positive and negative and having no periodicity, such as a sound signal transmission line or the like, the shield wire of the conventional structure and the shield wire of the present invention are obtained. And the difference clearly appears in the sound.

When a periodic signal, for example, a signal having periodicity such as a sine wave or a rectangular wave is applied to the shield wire of the present invention, as a result of observing the waveform with an oscilloscope or the like, the shield wire of the present invention and the conventional shield There is almost no difference in the sound of the lines. The reason is that the charge energy of the insulator due to dielectric distortion generated in the insulator flows into the conductor over time, and the audio signal music signal etc. is a positive and negative asymmetric signal with no periodicity, so it is clearly audible The effect can be determined.

The result of a comparative audition experiment using the shield wire of the present invention as a signal transmission line between a CD player and an amplifier, which is an example in which the characteristic of the insulator characteristic is most prominent, will be described.

A shielded wire with a three-part insulation structure as shown in FIGS. 1, 2 and 3 and a shield wire with a conventional insulation structure were manufactured and used for a signal cable of 900 mm in length connecting a CD player and an amplifier.

The comparative audition experiment was conducted with seven testers who have played musical instruments for more than 5 years. To eliminate the tester's taste as much as possible, whether the sound outline is clear or not, it does not exist in natural sounds. The presence or absence of cable-specific sound was used as a criterion.

In addition, the sound system, the sound source to be auditioned, the music genre, etc. were not particularly defined, and the source where the human conversation was recorded was used without specifying the listening location.

The results of listening to the shielded wire having the structure shown in FIG. 1 show that the outline of the sound is clearer in the case of the shielded wire according to the present invention compared to the conventional structure, and in the case of a music source. In addition, all seven testers confirmed that the cable-specific sound that does not exist in the natural sound is reduced.

The result of the trial listening of the shielded wire having the structure of FIG. 2 was the same as described in 0036 as compared with the conventional structure.

The test results of the shielded wire having the structure of FIG. 3 were confirmed by all seven testers that the contents described in 0036 were more remarkable.

1, 2, and 3 using the shielded wire of the present invention, the outline of the sound is very clear, and the outline of the conversation sound is clear even in a sound source recording a human conversation. All of the seven testers confirmed that the shield wire of the present invention was judged to be a shield wire having extremely excellent line dynamics.

As a result of using the shield wire of the present invention for a microphone cable, a signal transmission line of a record player, a signal transmission line between substrates of an amplification device, or an audio signal transmission line of an in-vehicle acoustic device, it was used for any of the lines. Even without exception, the results with high resolution were obtained.

Hereinafter, embodiments of the shield wire of the present invention will be described. However, the examples shown below exemplify a method for embodying the technical idea of the shielded wire of the present invention. The manufacturing method, the number of wires or insulators to be used, and the types of insulators, etc. Is not specified as follows. The shield wire of the present invention can be variously modified within the scope of claims 1, 2, and 3. Further, the manufacturing procedure and manufacturing method are not limited to the following. The following example is an example of handmade, and mass production may be performed using a conventional manufacturing method.

An embodiment in the case of manufacturing a shielded wire of the present invention having a required length of about 900 mm using a Sumiden Hitachi Cable 600V flame-resistant polyethylene insulated wire EMIE / F 0.75 mm square will be described.

In the following description of the embodiment, the wire described in 0042 is referred to as an insulated wire.

The insulated wire is cut to 1000 mm, which is about 100 mm longer than the required length, and both ends are fixed with fixing brackets or the like to give a tension of about 1 kg. As shown in FIG. 1, the insulator A is stripped about 5 mm in the axial direction so as not to damage the conducting wire at two locations of about 350 mm and 650 mm from the end of the cable with an ultrasonic cutter or the like.
A paraffin insulator D to be heat-sealed, which is an insulating material different from polyethylene, is wound around the surface of the conductor surface having a width of 5 mm that has been peeled off. This operation is performed in two places.
The place insulated by the insulator D is protected at two places by a heat-shrinkable tube having a withstand voltage of 600 V having a length of about 15 mm and a diameter of about 3 mm. Thus, a shielded wire core having a length of 900 mm and a three-part insulation structure is completed.
Cover the core wire with a commercially available braided shield with a length of 900 mm.
A thick heat-shrinkable tube insulator B having a length of 295 mm and a diameter of about 6 mm is covered with a gap of about 5 mm in the axial direction as shown in FIG. Insulation is performed with a paraffin insulator C that heat-fuses a 5 mm gap in the outer insulator. Furthermore, it protects with a heat shrinkable tube. Cut both ends of the manufactured shield wire by 50 mm to ensure the required length of 900 mm.
The shield wire having the axially divided insulating structure of claim 3 and FIG. 3 is thus completed.
The manufacturing method is not limited by the embodiments described herein, and may be performed freely for the purpose of blocking the continuity of the insulator. The insulation method, the insulating material to be used, etc. may be carried out by conventional technical common sense in consideration of pressure resistance, tensile strength, bending strength and the like. FIG. 3 It is clear that the shielded wires of claims 1 and 2 are completed in the process of the shielded wire embodiment and need not be explained.

The effect of using the shielded wire according to the present invention is hardly recognized in the sense of hearing on a line where a signal having periodicity is transmitted for positive and negative objects, but a signal that is not positive and negative and has no periodicity, for example, a music signal is transmitted. In this case, the difference in sound clearly appears and the effectiveness of the shield wire of the present invention is high.

For example, when the shield wire of the present invention is used as an inter-board connection line of an acoustic amplifier that is an electronic circuit, or when it is used as an audio signal transmission line of an in-vehicle acoustic device, the sufficient effect of the shield wire of the present invention is achieved. Was confirmed. It is also extremely effective when used for a headphone cable.

The insulation structure of the present invention is an insulation structure that can be used for any shielded wire regardless of the diameter of the conducting wire and the cross-sectional area. The effects described in the specification can be confirmed at the locations, and the industrial application range is extremely wide.

1 is a structural diagram of a shielded wire according to the present invention. It is a structure figure of this invention shield wire and Claim 2. It is a structure figure of this invention shield wire and Claim 3.

Explanation of symbols

1 A core wire portion of a shield wire.
2 This is the shield part of the shield wire.
3 It is the insulator A which insulates a shield wire core wire.
4 It is the insulator B which insulates a shield wire shield part.
5 Shield wire C is an insulator C that insulates the shield portion.
6 Insulator D that insulates shielded core wire

Claims (3)

A shielded wire characterized by a shielded wire axially divided insulation structure that prevents the insulation of the shielded wire core by alternately adhering a plurality of different types or different types of insulation, avoiding continuous insulation of the same type and quality along the shield wire axis direction. . Features a shielded wire axially divided insulation structure that avoids the same type of homogeneous insulators from continuing along the shield wire axis direction, and insulates the periphery of the shield wire shield part by alternately adhering multiple different or different types of insulators. Shielded wire. A shielded wire comprising a shielded wire axially divided insulating structure, wherein the shielded wire core wire insulating structure and the shield outer peripheral insulating structure satisfy both of the first and second aspects.

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