JP2005211947A - Electric wire for high frequency, and method for determining increase of surface area in conductor part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric wire for high frequency low in production cost and a method for determining the increase of surface area in a conductor part by which the surface area of the conductor part is efficiently increased in the number of recessed parts formed in a longitudinal direction on the outer peripheral surface of the conductor part and the conductivity of the high frequency current caused by the skin effect is improved and even the high-strength fine diameter wire of ≤1 mm diameter can be produced highly precisely at a high production efficiency. <P>SOLUTION: In this electric wire, the conductor part 1 having round-shaped cross section is formed of a good electric conductor, and a plurality of recessed parts 2 having arc-shaped or U-shaped cross section drawn with the desired radius r on the surface are provided appropriately in the longitudinal direction X at the interval on the outer peripheral surface in the conductor part. The recessed parts are formed on the surface of the conductor part of diameter ϕ. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for determining the increase in the surface area of a high-frequency electric wire and its conductor, and is optimal as a voice coil of a high-frequency speaker as an acoustic transducer or a coil used in an electromagnetic induction heating circuit of a high-frequency electromagnetic cooker, for example. While the conductor portion has a thin wire diameter, the surface area of the conductor portion is greatly increased, and in particular, the skin effect that occurs at high frequencies is enhanced to improve the conductivity of the high-frequency current.

  When the electric wire is energized as a conducting current i to a conductor portion made of a good electrical conductor having a uniform electric resistivity ρ such as metal, and the frequency is increased, no current flows in the central portion in the conductor portion, It is known as the skin effect that it flows in a concentrated manner on the surface.

  This phenomenon is caused by an overcurrent ie that suppresses a temporal change in magnetic flux due to a collecting magnetic field in the conductor due to the energization current i due to rotρie = −δB / δt, and the overcurrent ie occurs at the center of the conductor a. It is said that i is offset and promoted by the surface portion b.

And the magnitude δ of current is
δ = (2 / ρμω) ^1/2
It becomes.
Where ω = 2πf
μ = permeability ρ = electric resistivity.

  Since the current depth δ is attenuated to 1 / e at the skin depth, the equivalent cross-sectional area of the current value is obtained at a position close to the center of a round electric wire having a radius R of the conductor section. Decreases, the electric resistance increases, and the current hardly flows.

Therefore, in consideration of the skin effect, a plurality of grooves are provided on the outer circumferential surface of the conductor portion in the longitudinal direction at intervals in the circumferential direction of the conductor portion, thereby increasing the amount of current and achieving high electrical conductivity. There was an electric wire (for example, refer to Patent Document 1).
Japanese Utility Model Publication No. 5-15218

  However, in order to increase the surface area of the conductor portion, the conventional high-frequency electric wire described in Patent Document 1 has a groove provided in the longitudinal direction on the outer peripheral surface of the conductor portion. It is not an attempt to increase the optimum surface area by exploring the relationship with factors such as the cross-sectional shape and size, and the width of the groove, and the groove depth is approximately the same as the skin depth. Based on the setting, an attempt was made to increase the surface area of the conductor portion. Further, since the cross-sectional shape of the groove is formed in a trapezoidal or rectangular cross section, the surface area of the conductor portion could not be increased efficiently instead of the number of grooves. The depth of the groove is 7 to 8% with respect to the diameter of the wire, specifically assuming that the conductor has a diameter of 6 mm and practically a relatively thick wire. The groove formed at a depth of 0.48 mm is optimized, and the manufacturing accuracy is not strictly required. Particularly, the corner portion of the groove formed in a trapezoidal section or a rectangular section is not required. Processing was inaccurate.

  In addition, electronic equipment, office equipment, home appliances, optical equipment, acoustic equipment, etc. have been promoted for sophistication, precision, and densification, and recently, discharges used for electromagnetic waves such as lasers, masers, arcs, and plasmas. The progress of die precision machining technology is remarkable, such as the development of machining technology and NC grinding technology, and the development of tools suitable for precise cutting of workpieces due to the progress of sintering technology such as artificial diamond. Along with this, there is an increasing demand for high-frequency electric wires having a thin wire diameter with a conductor portion diameter of 1 mm or less.

  For example, in a loudspeaker as an acoustic device, it is necessary to improve the conductivity of a high-frequency current from the viewpoint of reproducing a high-frequency band. In order to improve the conductivity of the high-frequency current, it is necessary to devise measures such as increasing the surface area of the conductor part to increase the skin effect. However, if the surface area of the conductor part is increased, the wire diameter of the conductor part is increased. As a result, the diameter had to be increased. However, when the wire diameter is increased, the weight increases, so the weight of the voice coil part increases, the followability to the diaphragm such as a cone is lacking, and the faithful reproduction under the high sound range is impaired. It was.

  Therefore, in the voice coil of a high-frequency speaker, in order to achieve faithful reproduction in the high-frequency range, the surface area is increased while being as light as possible and the diameter is as small as possible. Appearance is desired. This demand is rapidly increasing from the visual field of video and the CG field where the treble reproduction band is expanding.

  Therefore, the present invention solves the above-mentioned conventional inconveniences as described in Patent Document 1, and the surface area of the conductor portion is increased and the high-frequency current can be conducted due to the skin effect while being as light and thin as possible. It is suitable for manufacturing high-strength electric wires with high precision and high production efficiency even when the wire diameter is 1 mm or less, and the surface area of the high-frequency electric wires and their conductors is low in production cost. Suitable for providing an increase determination method.

  The present invention has been made in view of the above-mentioned problems, and in the invention of claim 1, a conductor part having a round cross section is formed by a good electric conductor, and the conductor part has a circular arc shape or a cross section U drawn on the surface with a desired radius r. A plurality of letter-shaped concave portions were appropriately provided in the longitudinal direction at intervals on the outer peripheral surface, and the concave portions were formed on the surface of the conductor portion having a diameter φ.

  The invention according to claim 2 of the present invention is the conductor according to claim 1, wherein the conductor portion is made of a metal such as copper, aluminum, iron, or an alloy thereof, or a conductive material such as metal fiber or carbon black. A means is adopted in which the fine particles are dispersed or formed of any one of a conductive plastic such as an organic conductive polymer compound and a non-ferrous metal having conductivity.

  According to a third aspect of the present invention, in the first and second aspects, the surface area of the conductor portion is appropriately determined from the product of the diameter φ of the conductor portion and the circumference ratio. The outer length of the conductor corresponding to the above is reduced, and the means is increased by adding a plurality of concave arcs as appropriate.

  According to a fourth aspect of the present invention, in the first, second, and third aspects, the surface area of the conductor portion is formed on the outer peripheral surface of the conductor portion corresponding to the diameter φ of the conductor portion. The means is characterized in that it is increased by determining the proportion of the radius r of the concave portion to be determined.

  According to a fifth aspect of the present invention, in the first, second, third, and fourth aspects, the surface area of the conductor portion is substantially circular in cross section formed on the outer peripheral surface of the conductor portion. A concave portion having an arc shape or a U-shaped cross section is divided into two bisectors that bisect a narrow angle formed by two extension lines connecting both ends of the arc of the concave portion and the center of the outer circumference of the conductor portion. By drawing a center on each diameter of the conductor portion drawn for each concave portion, a tangent line drawn at the intersection where the diameter intersects the outer circumference circle of the conductor portion, and the intersection and the arc A means was adopted in which the surface area is increased by selecting a predetermined angle as the installation angle of the concave portion as the left and right angle formed by the extension line connecting both ends.

  According to a sixth aspect of the present invention, in the first, second, third, fourth, and fifth aspects, the concave portion is larger than the outer circumference of the conductor portion on the diameter. A means is adopted which is characterized in that it is formed with a desired radius from the center determined by moving inward.

  Further, the invention according to claim 7 of the present invention is that in claim 1, claim 2, claim 3, claim 4, claim 5 or claim 6, the diameter φ of the conductor portion is 0.1. ˜1 mm, preferably 0.3 to 0.6 mm, and more preferably about 0.4 mm.

  In the invention according to claim 8 of the present invention, the radius r of the concave portion is as defined in claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, and claim 7. , 0.03 to 0.06 mm, and preferably 0.04 mm.

  The invention according to claim 9 of the present invention is the concave portion according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, and claim 8. The radius r is 0.03 to 0.06 mm, preferably 0.04 mm, whereas the installation angle α corresponding to the concave portion provided on the surface of the conductor portion is 155.04 ° to 168. The surface area of the conductor portion is selected by setting the angle to 522 °, preferably 155.174 °, and the means is adopted.

  In the invention according to claim 10 of the present invention, the surface area of the conductor part having a round cross section by the good electric conductor is a concave part having a circular arc shape or a U-shaped cross section formed on the outer peripheral surface of the conductor part. However, the center is set on the diameter φ of the conductor portion as a bisector that bisects the included angle formed by two extension lines connecting both ends of the arc of the concave portion and the center of the outer circumference circle of the conductor portion. As a result, the left and right angle margins formed by the tangent line drawn at the intersection where the diameter intersects the conductor portion and the extended line connecting the intersection and both ends of the arc are formed. A means of increasing the surface area by selecting an installation angle of the concave portion as a corner to a predetermined angle was adopted.

  According to an eleventh aspect of the present invention, in the tenth aspect of the present invention, in the tenth aspect, the concave portion is formed at a desired radius from the center determined by moving inward from the outer circumference of the conductor portion on the diameter. Adopted means characterized by being.

  In the high-frequency electric wire of the present invention, a circular arc or U-shaped concave portion drawn at a desired radius r is spaced from the outer peripheral surface of a round cross-section conductor portion formed of a good electric conductor. Since a plurality of conductors are provided in the longitudinal direction as appropriate, the surface area of the conductor part is increased while the conductor part is light and has a thin wire diameter, and the high-frequency current conduction due to the skin effect is improved.

  Even a thin wire having a diameter of 1 mm or less is suitable for producing a wire having high strength such as pulling, compression, twisting and the like with high accuracy and high production efficiency, and the production cost is also low.

  Hereinafter, specific examples of embodiments of the present invention will be described with reference to the drawings.

  1 is a cross-sectional view showing Embodiment 1 of the high-frequency electric wire of the present invention, FIG. 2 is a perspective view, and FIG. 3 is an enlarged cross-sectional view for explanation.

  In FIG. 1, 1 is a conductor part having a round cross section formed by a good electric conductor, and this conductor part 1 is preferably formed with a diameter φ of 0.1 to 1 mm, and in this embodiment 0.3 mm. Used for. The conductor portion 1 is made of, for example, a metal made of copper, aluminum, iron, or an alloy thereof, or plastic, in which conductive fine particles such as metal fibers and carbon black are dispersed, or a conductive material such as an organic conductive polymer compound. For example, a conductive plastic, or a conductive non-ferrous metal such as silicon, germanium, or zirconium.

  1 and 3 are drawn on the surface of the conductor portion 1 with a desired radius r. As shown in FIG. 1 and FIG. By providing an appropriate number in the longitudinal direction X with an interval on the outer circumferential surface of the conductor portion 1, six in FIG. 1 and FIG. 3, an uneven surface is formed in the longitudinal direction X on the outer circumferential surface of the conductor portion 1. Moreover, the concave portion 2 is formed to be approximately 1 mm or less from the surface of the conductor portion 1 having a diameter φ toward the center O.

  In order to form the concave portion 2 on the surface of the conductor portion 1, for example, it is formed by grinding or plastic processing by a drawing method using a die (not shown). It is selected in consideration of the current-carrying property of the high-frequency current flowing through the part 1, the material of the conductor part 1, the diameter φ, the tensile strength of the conductor part 1 during processing and use, the rigidity, and the like.

  At this time, the concave portion 2 corresponds to the diameter φ of the conductor portion 1 being a thin wire diameter of 0.1 mm to 1 mm in the first embodiment, even if the diameter φ of the conductor portion 1 is not necessarily increased unnecessarily. The concave portion 2 has a radius of 0.01 to 0.06 mm, and the surface area of the conductor portion 1 is increased by setting a large proportion of the radius r corresponding to the diameter φ.

Further, in the first embodiment, in FIGS. 1 and 3, the surface area Ld of the conductor portion 1 is the concave portion 2 having a circular arc shape or U-shaped cross section formed on the surface of the conductor portion 1. The angle between two ends p ₁ and p ₂ of the arc l ₁ and the center O of the outer circumference circle L of the conductor portion 1 is divided into two equal parts to obtain an angle θ. The line M is drawn with a desired radius r by setting a center o on each diameter φ of the conductor portion 1 drawn for each concave portion 2, so that the diameter with respect to the outer circumference L of the conductor portion 1 is drawn. As the residual angle of the left and right angles β, β formed by the tangent line Q drawn at the intersection T where φ intersects and the extension lines J1, J2 connecting the intersection T and the ends p ₁ , p _{2 of the} arc l ₁ The surface area Ld is increased by selecting the desired installation angle α of the concave portion 2.

In the first embodiment, the angle θ is set to 11.478 ° to 16.499 °. Further, the left-right angle β formed by the tangent line Q drawn to the intersection point T and the extension lines J1 and J2 connecting the intersection point T and both ends p ₁ and p _{2 of the} arc l ₁ is 5.739 ° to 31. .569 °.

  And the surface area of the conductor part 1 of this Embodiment 1 in the case of providing the concave part 2 in the surface of the conductor part 1 can be calculated | required by the following general formula [Formula 1].

Ld = 2πR−n · l ₀ + n · l ₁ (Equation 1).

Here, Ld; installation of the recessed portion 2; conductor part 1 of the surface area R; radius n · l ₁ of the conductor part 1; arc n · l of the recessed portion 2 in the case of the installation number of the concave portions 2 and the n number ₀ This is the outer peripheral length of the conductor portion 1 corresponding to the arc of the concave portion 2 when the number is n.

In the above [Expression 1], the surface area Ld of the conductor section 1 having a round cross section is appropriately plural from the product value of the diameter φ and the circumference ratio π of the conductor section 1. In the first embodiment, for example, FIG. As shown in FIG. 3, the surface area Ld of the conductor portion 1 is determined by adding the arcs l ₁ of the six concave portions 2 provided on the conductor portion 1.

Further, the outer peripheral length l ₀ of the conductor portion 1 corresponding to the arc l ₁ of the concave portion 2 can be obtained by the following [Equation 2].

l ₀ = 2π (2 × θ / 360 °) [Equation 2]

Here, theta; ends p ₁ arc l ₁ of the recessed portion 2, p ₂ and bisectors diameter φ of the conductor portion 1 a included angle of extension q1, q2 connecting the center O of the conductor portion 1 is formed M is an angle that is divided into two equal parts.

Further, the arc l ₁ of the concave portion 2 can be obtained by the following [Equation 3].

l ₁ = 2πr (α / 360 °) (Formula 3)

Here, alpha; ends p ₁ arc l ₁ of the recessed portion 2, p ₂ and an extended line connecting the center O of the circle of the conductor portion 1 q1, q2 forms of the conductor portion 1 bisecting the included angle diameter φ is The tangent line Q of the outer circumference circle L of the conductor portion 1 drawn with respect to the intersection point T intersecting with the outer circumference length l ₀ of the conductor portion 1 and both ends p ₁ and p _{2 of the} arc T ₁ of the intersection point T and the concave portion _2. Is an installation angle of the concave portion 2 as an additional angle of the left and right angles β, β formed by the extension lines J1, J2.

Then, in order to obtain the surface area Ld of the conductor part 1 using the above [Formula 1], [Formula 2], and [Formula 3], the solution is obtained by substituting the angle θ into the above [Formula 2]. Both ends p ₁ arc l ₁ of the recessed portion 2 to assume, p ₂ and the conductor part 1 extension q1, narrow angle q2 forms connecting the center O of the circle of the conductor portion 1 a (2 × theta) bisecting The tangent line Q of the outer circumference circle L of the conductor portion 1 drawn with respect to the intersection point T where the diameter φ of the conductor portion 1 intersects the outer circumference length l ₀ of the conductor portion 1, and both ends p of the arc T ₁ of the intersection point T and the concave portion 2 By selecting the left and right angles β and β formed by the extension lines J1 and J2 connecting ₁ and p _2, and obtaining the installation angle α of the concave portion 2 as the remainder angle and substituting it into the above [Equation 3] Find a solution. Furthermore, the surface area Ld of the conductor portion 1 can be obtained by determining the number of the recessed portions 2 and substituting the values obtained for the angle θ and the installation angle α into the above [Equation 1] and rearranging them. The surface area Ld is increased.

  Accordingly, the high-frequency electric wires obtained in the first embodiment are appropriately formed in the longitudinal direction X on the surface of the conductor part 1 having a round or U-shaped cross section by a good electrical conductor, for example, 6 to 8 are formed. On the other hand, in the high-frequency electric wire described in Patent Document 1, the groove provided in the longitudinal direction of the conductor portion is formed in a trapezoidal cross section or a rectangular cross section. Unlike the case where the wire is cut into a trapezoidal shape or a rectangular shape and is difficult to form with high precision, and the groove processing of the wire with a thin wire diameter is difficult, the high-frequency wire seen in the first embodiment is, for example, A desired number of concave portions of 6 to 8 having a circular arc shape or a U-shaped cross section on the surface of the conductor portion 1 having a diameter φ of 0.1 mm to 1 mm by drawing using a die (not shown). 2 can be easily and reliably formed with high accuracy.

  Moreover, the high-frequency electric wire obtained in the first embodiment can be easily applied when CAD design using a computer is performed, so that it is easy to design a high-precision electric wire and to design and manufacture a die. In addition, the production efficiency of electric wires is greatly improved. And the electric wire for high frequency of this Embodiment 1 searches the relationship with factors, such as the cross-sectional shape and magnitude | size of the recessed part 2, and the installation width of the recessed part 2, with respect to the cross-sectional shape of the conductor part 1, and the conductor part 1 It is possible to easily form the concave portion 2 on the surface and increase the optimum surface area.

  Further, as a forming method, in addition to the forming method using the above-described die, for example, by an electric discharge machining technique using electromagnetic waves such as laser, maser, arc, plasma, NC grinding, or artificial diamond, etc. It can be easily formed by cutting using the sintering technique.

Specifically, in FIG. 1, FIG. 2, and FIG. 3, six conductors having a radius r of 0.05 mm are formed on the surface of the conductor section 1 having a circular cross section with a diameter φ of 0.3 mm using copper as the conductive material. The concave portions 2 are provided at intervals. In this case, the extension line q1, narrow angle q2 forms (2 × theta) of the conductor portion first diameter φ connecting the center O of the circle at both ends p _1, p ₂ and the conductor part 1 of arc l ₁ of the recessed portion 2 An angle θ that divides into two bisectors M is 16.499, and an extension line that connects both ends p ₁ and p ₂ of the arc l ₁ of the concave portion ₂ and the center O of the outer circumference L of the conductor portion 1. An extension line J1, connecting the tangent line Q of the outer circumference circle L of the conductor part 1 that bisects the included angle formed by q1 and q2, and the intersection T of the tangent line Q and both ends p ₁ and p _{2 of the} arc l ₁ , The left and right angles β and β formed by J2 were 31.568 °, and the conductor portion 1 was formed with the installation angle α of the concave portion 2 as an additional angle of the angles β and β being 116.862 °.

  In addition, the conductor portion 1 is not limited to the case where it is formed of copper. In addition, conductive fine particles such as metal fibers and carbon black are dispersed in a metal made of aluminum, iron, or an alloy thereof, or plastic. Or a conductive plastic such as an organic conductive polymer compound, or a conductive non-ferrous metal such as silicon, germanium, or zirconium.

  The surface area Ld of the conductor portion 1 of the first embodiment thus obtained is 0.0863 when the angle θ is substituted for 16.499 ° in the above [Expression 2]. When the installation angle α is 116.862 °, the value is 0.102. Furthermore, when the values obtained for the angle θ and the installation angle α are substituted into the above [Formula 1] and rearranged, the surface area Ld of the conductor portion 1 becomes 1.0362. Then, the surface area Ld of the conductor portion 1 is increased by 10% in the high-frequency electric wire of Example 1 compared to the conventional simple round electric wire in which the conductor portion 1 has a round cross section and the diameter φ is 0.3 mm. Became.

  When a high-frequency current is passed through the conductor portion 1 of Example 1 thus obtained, good electrical conductivity can be obtained due to the skin effect. Since the conductor portion 1 of the first embodiment is a thin wire having a diameter φ of 0.3 mm, the conductor portion 1 of the first embodiment is used as a voice coil for driving a cone diaphragm of a speaker, for example. Is used, the conductor portion 1 is light in weight and has a thin wire diameter, but the surface area Ld of the conductor portion 1 is increased to improve the current-carrying performance of the high-frequency current, and the drivability and responsiveness of the voice coil to the diaphragm are improved. Good and quick and reliable control can be performed. Especially, the intermodulation distortion is small in the high frequency band, the directivity is improved, a clear tone that is not turbid in the high frequency range can be reproduced, and the faithful reproduction can be performed.

  Moreover, when using the conductor part 1 of this Example 1 for the electromagnetic induction heating circuit part of a high-frequency electromagnetic cooker, even when the number of windings of the coil is increased, even when the number of windings is small, a high temperature is generated by electromagnetic induction heating. Heat generation can be obtained in a short time, responsiveness is good and control can be performed reliably. Furthermore, since the coil occupation space of the conductor part 1 can be reduced in volume, the apparatus can be made compact and lightweight.

  FIGS. 4 and 5 show Example 2 of the high-frequency electric wire of the present invention. On the surface of the conductor portion 1 having a round cross section with a diameter φ of 0.3 mm using copper as a conductive material. Eight concave portions 2 having a radius r of 0.03 mm and an installed number dn larger than those of the first embodiment were provided at intervals.

  In the second embodiment, the angle θ is 11.478 °, and the installation angle α of the concave portion 2 is 168.522 °.

  The surface area Ld of the conductor portion 1 of Example 2 formed in this way is set such that the angle θ of 11.478 ° is substituted for [Formula 2], and the installation angle α of the concave portion 2 is 168.522 °. Substituting the value of [Equation 3] into [Equation 3], substituting the value obtained from these into [Equation 1] and rearranging, the surface area Ld of the conductor portion 1 becomes 1.1676, and the cross section of the conductor portion 1 is round. In the high-frequency electric wire of Example 2, the surface area of the conductor part 1 was increased by 23.9% compared to the conventional round electric wire.

  When a high-frequency current is passed through the conductor portion 1 obtained in the second embodiment, good electrical conductivity can be obtained due to the skin effect. Since the conductor portion 1 of the second embodiment is a thin wire having a diameter φ of 0.3 mm, the conductor portion 1 of the second embodiment is applied to a voice coil for driving a cone diaphragm of a speaker, for example. Is used, the conductor portion 1 is light in weight and has a thin wire diameter, but the surface area Ld of the conductor portion 1 is increased to improve the current-carrying performance of the high-frequency current, and the drivability and responsiveness of the voice coil to the diaphragm are improved. In particular, the intermodulation distortion is small in the high sound band, the directivity is improved, a clear tone that is not turbid in the high sound range can be reproduced, and faithful reproduction can be performed.

  Moreover, when using the conductor part 1 of this Example 2 for the electromagnetic induction heating circuit part of a high frequency electromagnetic cooker, when the number of windings of a coil is increased, not only in the number of windings but also high temperature by electromagnetic induction heating. Heat generation can be obtained in a short time, responsiveness is good and control can be performed reliably. Furthermore, since the coil occupation space of the conductor portion 1 can be reduced in volume, the device can be made compact and light.

  6 and 7 show Example 3 of the high-frequency electric wire of the present invention, and the outer peripheral surface of the conductor portion 1 having a round cross section with a diameter φ of 0.6 mm using copper as the conductive material. In addition, eight concave portions 2 having a radius r of 0.06 mm were provided at intervals. In the third embodiment, the angle θ is 11.478 °, and the installation angle α of the concave portion 2 is 168.522 °.

  As for the surface area Ld of the conductor portion 1 of Example 3 formed in this way, the value of the angle θ of 11.478 ° is substituted into [Expression 2], and the installation angle α of the concave portion 2 is 168.522 °. Substituting the value of [Equation 3] into [Equation 3], substituting the value obtained from these into [Equation 1] and rearranging, the surface area Ld of the conductor portion 1 becomes 2.333, and the cross section of the conductor portion 1 is round. In the high-frequency electric wire of Example 3, the surface area of the conductor portion 1 was increased by 23.7% compared to the conventional round electric wire.

  When a high-frequency current is passed through the conductor portion 1 obtained in the third embodiment, good electrical conductivity can be obtained due to the skin effect. Since the conductor portion 1 of the third embodiment is a thin wire having a diameter φ of 0.6 mm, the conductor portion 1 of the third embodiment is applied to a voice coil for driving a cone diaphragm of a speaker, for example. Is used, the surface area Ld of the conductor portion 1 is increased while the conductor portion 1 is light and has a thin wire diameter, the high-frequency current is improved, and the drive performance and responsiveness of the voice coil to the diaphragm are improved. In particular, the intermodulation distortion is small in the high sound band, the directivity is improved, a clear tone that is not turbid in the high sound range can be reproduced, and faithful reproduction can be performed.

  Moreover, when using the conductor part 1 of this Example 3 for the electromagnetic induction heating circuit part of a high frequency electromagnetic cooker, when the number of windings of a coil is increased, not only in the number of windings but also high temperature by electromagnetic induction heating. Heat generation can be obtained in a short time, responsiveness is good and control can be performed reliably. Furthermore, since the coil occupation space of the conductor portion 1 can be reduced in volume, the device can be made compact and light.

  8 and 9 show Example 4 of the high-frequency electric wire of the present invention, and the outer peripheral surface of the conductor part 1 having a round cross section with a diameter φ of 0.5 mm using copper as the conductive material. In addition, eight concave portions 2 having a radius r of 0.05 mm were provided at intervals. The fourth embodiment is the same as the third embodiment in that the conductor portion 1 is formed so that the angle θ is 11.478 ° and the installation angle α of the concave portion 2 is 168.522 °.

  As for the surface area Ld of the conductor portion 1 of Example 4 formed in this way, the value of the angle θ of 11.478 ° is substituted into [Expression 2], and the installation angle α of the concave portion 2 is 168.522 °. Substituting the value of [Equation 3] into [Equation 3], substituting the value obtained from these into [Equation 1] and rearranging, the surface area Ld of the conductor portion 1 becomes 1.946, and the cross section of the conductor portion 1 is round. In the high-frequency electric wire of Example 4, the surface area of the conductor portion 1 was increased by 23.9% compared to the conventional round electric wire.

  And when flowing a high frequency current through the conductor part 1 obtained in the present Example 4, good electrical conductivity is obtained by the skin effect. Since the conductor portion 1 of the fourth embodiment is a thin wire having a diameter φ of 0.5 mm, the conductor portion 1 of the fourth embodiment is used for a voice coil for driving a cone diaphragm of a speaker, for example. Is used, the surface area Ld of the conductor portion 1 is increased while the conductor portion 1 is light and has a thin wire diameter, the high-frequency current is improved, and the drive performance and responsiveness of the voice coil to the diaphragm are improved. The reproduction is improved and the faithful reproduction is improved, and reproduction with less noise and excellent directivity can be performed particularly in a high sound band.

  In addition, when the conductor portion 1 of the fourth embodiment is used for an electromagnetic induction heating circuit portion of a high-frequency electromagnetic cooker, sufficient heat generation is obtained even when the number of windings of the coil is increased as well as when the number of windings of the coil is increased. Furthermore, the coil occupation space can be reduced in volume, and the apparatus can be made compact and lightweight.

  10 and 11 show Example 5 of the high-frequency electric wire of the present invention, and the outer peripheral surface of the conductor part 1 having a round cross section with a diameter φ of 0.4 mm using copper as the conductive material. In addition, eight concave portions 2 having a radius r of 0.04 mm were provided at intervals. The fifth embodiment is the same as the fourth embodiment in that the conductor portion 1 is formed so that the angle θ is 11.478 ° and the installation angle α of the concave portion 2 is 168.522 °.

  For the surface area Ld of the conductor portion 1 of Example 5 formed in this way, the value of the angle θ of 11.478 ° is substituted into [Expression 2], and the installation angle α of the concave portion 2 is 168.522 °. Substituting the value of [Equation 3] into [Equation 3], substituting the value obtained from these into [Equation 1] and rearranging, the surface area Ld of the conductor portion 1 becomes 1.552, and the cross section of the conductor portion 1 is round. In the high-frequency electric wire of Example 5, the surface area of the conductor portion 1 was increased by 23.5% compared to the conventional round electric wire.

  When a high-frequency current is passed through the conductor portion 1 obtained in the fifth embodiment, good electrical conductivity can be obtained due to the skin effect. Since the conductor portion 1 of the fifth embodiment is a thin wire having a diameter φ of 0.4 mm, the conductor portion 1 of the fourth embodiment is used for a voice coil for driving a cone diaphragm of a speaker, for example. Is used, the surface area Ld of the conductor portion 1 is increased while the conductor portion 1 is light and has a thin wire diameter, the high-frequency current is improved, and the drive performance and responsiveness of the voice coil to the diaphragm are improved. The reproduction is improved and the faithful reproduction is improved, and reproduction with less noise and excellent directivity can be performed particularly in a high sound band.

  In addition, when the conductor portion 1 of the fifth embodiment is used for an electromagnetic induction heating circuit portion of a high-frequency electromagnetic cooker, sufficient heat generation is obtained even when the number of windings of the coil is increased as well as when the number of windings of the coil is increased. Further, the coil occupation space can be reduced in volume, and the apparatus can be made compact and lightweight as in the fourth embodiment.

FIGS. 12 and 13 show a sixth embodiment of the high-frequency electric wire according to the present invention. In this sixth embodiment, in order to form the concave portion 2 on the surface of the conductor portion 1, the arc l ₁ of the concave portion 2. Each concave part as a bisector M that bisects and divides the included angle formed by two extension lines q1 and q2 that connect both ends p ₁ and p ₂ of the conductor and the center O of the outer circumference L of the conductor part 1 The surface area Ld is increased by moving the center o inwardly (in the direction of the center O) by a moving amount δ on each diameter φ of the conductor portion 1 drawn every two.

That is, the outer circumference circle L of the conductor portion 1 is taken as a reference circle, and the movement amount δ is set to 0. 0 inward with respect to the tangent line Q of the intersection T where the diameter φ of the conductor portion 1 intersects the outer circumference length l ₀ of the conductor portion 1. A line Q ′ drawn by translating to 02 mm is a round section having a diameter φ of 0.5 mm using copper as a conductive material with an intersection T ′ intersecting with the diameter φ as a bisector M as a center o. Eight concave portions 2 having a radius r of 0.05 mm are provided at intervals on the outer peripheral surface of the conductor portion 1 forming the following. In Example 6, the conductor portion 1 is formed so that the angle θ is 12.48 ° and the installation angle α of the concave portion 2 is 167.52 °.

  For the surface area Ld of the conductor portion 1 of Example 6, the value of the angle θ of 12.48 ° is substituted into [Expression 2], and the installation angle α of the concave portion 2 is set to 167.52 ° [Expression 3]. ], Substituting the values obtained from these into [Equation 1] and rearranging, the surface area Ld of the conductor part 1 is 2.189, and the conventional round electric wire in which the conductor part 1 has a round cross section. In the high-frequency electric wire of Example 6, the surface area of the conductor part 1 was actually increased by 39.4%.

  When a high-frequency current is passed through the conductor portion 1 obtained in the sixth embodiment, good electrical conductivity can be obtained due to the skin effect. Since the conductor portion 1 of the sixth embodiment is a thin wire having a diameter φ of 0.5 mm, the conductor portion 1 of the sixth embodiment is used as a voice coil for driving a cone diaphragm of a speaker, for example. Is used, the surface area Ld of the conductor portion 1 is increased while the conductor portion 1 is light and has a thin wire diameter, the high-frequency current is improved, and the drive performance and responsiveness of the voice coil to the diaphragm are improved. The reproduction is improved and the faithful reproduction is improved, and reproduction with less noise and excellent directivity can be performed particularly in a high sound band.

  And when using the conductor part 1 of this Example 6 for the electromagnetic induction heating circuit part of a high frequency electromagnetic cooker, sufficient heat generation is obtained even when the number of windings of the coil is increased as well as when the number of windings of the coil is increased. Furthermore, the coil occupation space can be reduced in volume, and the apparatus can be made compact and lightweight.

14 and 15 show a seventh embodiment of the high-frequency electric wire according to the present invention. In this seventh embodiment, the concave portion 2 is formed on the surface of the conductor portion 1 as in the sixth embodiment. both ends p _1, p ₂ arc l ₁ of the recessed portion 2, the two extension line connecting the center O of the outer circumferential circle L of the conductor portion 1 q1, q2 is 2 and the like for dividing the included angle is bisected forming The surface area Ld is increased by moving the center o inwardly (in the direction of the center O) by the amount of movement δ on each diameter φ of the conductor portion 1 drawn for each concave portion 2 as a branch line M. Is.

That is, the outer circumference circle L of the conductor portion 1 is taken as a reference circle, and the movement amount δ is set to 0. 0 inward with respect to the tangent line Q of the intersection T where the diameter φ of the conductor portion 1 intersects the outer circumference length l ₀ of the conductor portion 1. A line Q ′ drawn by translating to 015 mm is a round cross section having a diameter φ of 0.4 mm using copper as a conductive material with an intersection T ′ intersecting with the diameter φ as a bisector M as a center o. Eight concave portions 2 having a radius r of 0.04 mm are provided at intervals on the outer peripheral surface of the conductor portion 1 forming the following. In the seventh embodiment, the conductor portion 1 is formed so that the angle θ is 12.413 ° and the installation angle α of the concave portion 2 is 167.59 °.

  For the surface area Ld of the conductor portion 1 of Example 7 formed in this way, the value of the angle θ of 12.41 ° is substituted into [Equation 2], and the installation angle α of the concave portion 2 is the value of 167.59 °. Substituting into [Equation 3] and substituting the values obtained from these into [Equation 1] and rearranging them, the surface area Ld of the conductor part 1 is 1.76, and the cross section of the conductor part 1 is round. In the high-frequency electric wire of Example 7, the surface area of the conductor portion 1 was extremely higher than that of the round electric wire, and increased by 40.1%.

  Therefore, in the high-frequency electric wire of Example 7, when a high-frequency current is passed through the conductor portion 1, extremely good electrical conductivity can be obtained due to the skin effect. Since the conductor portion 1 of the seventh embodiment is a thin wire having a diameter φ of 0.4 mm, the conductor portion 1 of the seventh embodiment is applied to a voice coil for driving a cone diaphragm of a speaker, for example. Is used, the surface area Ld of the conductor portion 1 is increased while the conductor portion 1 is light and has a thin wire diameter, the high-frequency current is improved, and the drive performance and responsiveness of the voice coil to the diaphragm are improved. The reproduction is extremely improved and the faithful reproduction is good. In particular, reproduction with less noise and excellent directivity can be performed in a high sound band.

  And when using the conductor part 1 of this Example 7 for the electromagnetic induction heating circuit part of a high frequency electromagnetic cooker, when the number of windings of a coil is increased, it also generates heat even when the number of windings is small. The occupied space can be reduced in volume, and the downsizing and weight reduction of the device are prominent.

Further, FIGS. 16 and 17 show Example 8 of the high-frequency electric wire according to the present invention. In Example 8, the concave part 2 is formed on the surface of the conductor part 1 in the same manner as in Examples 6 and 7. both ends p _1, p ₂ arc l ₁ of the recessed portion 2 to form, with the included angle of the two extension lines q1, q2 connecting the center O of the outer circumferential circle L of the conductor portion 1 forms bisect By setting the bisector M to be divided by moving the center o inward (center O direction) by the movement amount δ on each diameter φ of the conductor portion 1 drawn for each concave portion 2. The surface area Ld was increased.

That is, the outer circumference circle L of the conductor portion 1 is taken as a reference circle, and the movement amount δ is set to 0. 0 inward with respect to the tangent line Q of the intersection T where the diameter φ of the conductor portion 1 intersects the outer circumference length l ₀ of the conductor portion 1. A line Q ′ that is drawn parallel to 01 mm is a round section having a diameter φ of 0.3 mm using copper as a conductive material with an intersection T ′ intersecting with the diameter φ as a bisector M as a center o. Eight concave portions 2 having a radius r of 0.03 mm are provided at intervals on the outer peripheral surface of the conductor portion 1 forming the following. In Example 8, the conductor portion 1 is formed so that the angle θ is 12.48 ° and the installation angle α of the concave portion 2 is 167.7 °.

  For the surface area Ld of the conductor portion 1 of Example 8 formed in this way, the value of the angle θ of 12.48 ° is substituted into [Equation 2], and the installation angle α of the concave portion 2 is 167.7 °. Substituting into [Equation 3] and substituting the values obtained from these into [Equation 1] and rearranging them, the surface area Ld of the conductor part 1 becomes 1.29, and the cross section of the conductor part 1 is round. In the high-frequency electric wire of Example 8, the surface area of the conductor portion 1 was extremely higher than that of the round electric wire, and increased by 37.1%.

  Therefore, in the electric wire for high frequency of the eighth embodiment, when a high frequency current is passed through the conductor portion 1, extremely good electrical conductivity can be obtained due to the skin effect. Since the conductor portion 1 of the eighth embodiment is a thin wire having a diameter φ of 0.3 mm, the conductor portion 1 of the eighth embodiment is used as a voice coil for driving a cone diaphragm of a speaker, for example. Is used, the surface area Ld is increased and the driving performance and responsiveness of the diaphragm are greatly improved under a small current, and the faithful reproduction is improved. Reproduction with little noise in the band and excellent directivity can be performed.

  And when using the conductor part 1 of this Example 8 for the electromagnetic induction heating circuit part of a high frequency electromagnetic cooker, when the number of windings of the coil is increased, the amount of heat generation is sufficient even when the number of windings is small. The coil occupying space can be reduced in volume, and the device can be made compact and lightweight.

For the obtained Example 1, Example 2, Example 3, Example 4, Example 5, Example 6, Example 7, Example 8 and Example 8, installation of the concave part 2 formed on the surface of the conductor part 1 number, and the included angle formed by extension lines q1, q2 connecting the center O of the circle at both ends p _1, p ₂ and the conductor part 1 of arc l ₁ of the recessed portion 2 divided into two parts in the diameter of the conductor portion 1 phi divided Angle θ, the radius r of the concave portion 2, and the sandwiched angle formed by the extended lines q ₁ and q ₂ connecting the ends p ₁ and p _{2 of the} arc l ₁ of the concave portion ₂ and the center O of the circle of the conductor portion 1. Tangent Q of the outer circumference circle L of the conductor portion 1 drawn with respect to the intersection point T where each diameter φ of the conductor portion 1 dividing the conductor portion 1 intersects the outer circumference length l ₀ of the conductor portion 1, the intersection point T and the arc l _{The following} [Table 1] can be obtained by putting together the installation angle α of the concave portion 2 as the residual angle of the left and right angles β, β formed by the extension lines J1, J2 connecting both ends p ₁ , p _{2 of} 1 It was.

  When, for example, Example 1 and Example 2 are compared according to the above [Table 1], the diameter φ of the cross section of the conductor part 1 is the same as 0.3 mm in both of Example 1 and Example 2. Considering the case where the surface area Ld of the conductor part 1 is increased for Example 1 and Example 2, as a matter of course, if the number dn of the recessed parts 2 formed on the outer periphery of the conductor part 1 increases, It can be seen that the surface area Ld increases. Incidentally, in the first embodiment and the second embodiment, when the number dn of the recessed portions 2 is six in the first embodiment but increased to eight as in the second embodiment, the first embodiment will be described. Thus, the surface area Ld of each conductor portion 1 and 1 is 2 times greater than that of the first embodiment, and the surface area is increased by a factor of two. It was found that the electrical conductivity of was improved.

  In addition, when, for example, Example 2, Example 3, Example 4, and Example 5 are compared according to [Table 1], the number dn of the recessed portions 2 is the same, and the outer circumferential arc portion of the conductor portion 1 is the same. When the surface angle Ld of the conductor portion 1 is considered when the angle θ and the installation angle α are the same, the angle θ is 11.478 in all of the second embodiment, the third embodiment, the fourth embodiment, and the fifth embodiment. °, the diameter φ of the conductor portion 1 is 0.3 mm, 0.6 mm, 0.5 mm, and 0.4 mm, and the radius r of each concave portion 2 is 0.03 mm, 0.06 mm, 0.05 mm, When the number of the recessed portions 2 is the same, the surface area Ld of the conductor portion 1 is 23.5% to 23.9%, which may be substantially the same value. I understood.

  In this case, the increase rate of the surface area L of the conductor portion 1 is determined by the ratio of the diameter φ of the conductor portion 1 and the radius r of the concave portion 2. That is, it was found that the surface area Ld of the conductor portion 1 increases as the ratio of the radius r of the concave portion 2 to the diameter φ of the conductor portion 1 is increased or the ratio is increased.

  Further, in [Table 1], the number dn of the recessed portions 2 is increased as in the first and second embodiments, and the surface area Ld of the conductor portion 1 is increased. As shown in the comparison, the number dn of the concave portions 2 is the same, that is, the number of the concave portions 2 with respect to the diameter φ of the conductor portion 1 is originally eight in the sixth and eighth embodiments. The ratio of r is constant (in Example 6, the diameter φ of the conductor portion 1 is 0.5 mm, the radius r of the concave portion 2 is 0.05 mm, and the ratio between the two is 10: 1. In Example 8, the diameter φ of the conductor part 1 is 0.3 mm, the radius r of the concave part 2 is 0.03 mm, and the ratio of the two is 10: 1. The surface area Ld of the conductor part 1 is increased by 39.4% compared to the conventional round electric wire having the same diameter of the embodiment. In surface area Ld is 37.1% greater, towards the diameter φ of the conductor part 1 is thicker Example 6 it can be seen that the surface area Ld increases. And, the skin effect provides good high-frequency current conduction.

  Further, in Example 7 of the present invention, the diameter φ of the conductor part 1 is 0.4 mm, the radius r of the concave part 2 is 0.04 mm, and the ratio of the two is the same as that of Example 6 and Example 8 described above. Similarly, when the angle θ is 12.413 ° and the installation angle α of the concave portion 2 is 155.174 °, the surface area Ld of the conductor portion 1 is increased by 40.1%. Was recorded. And the electrical conductivity of a high frequency current is exhibited with high efficiency.

In addition, Example 7, Example 6, and Example 8 were invented by the inventor to further increase the surface area Ld of the conductor part 1, and the concave part 2 was formed on the surface of the surface conductor part 1. both ends p _1, p ₂ arc l ₁ of the recessed portion 2 to form, with the included angle of the two extension lines q1, q2 connecting the center O of the outer circumferential circle L of the conductor portion 1 forms bisect The center o of the concave portion 2 is moved inward (center O direction) by a desired movement amount δ on each diameter φ of the conductor portion 1 drawn as the bisector M to be divided for each concave portion 2, By setting the surface area Ld, the rate of increase of the surface area Ld is increased by the amount of movement δ × 2 times of the center o of the concave portion 2 × the number n of the concave portions 2 compared to the first to fifth embodiments. It was found that the surface area Ld of the conductor portion 1 increases greatly as the amount of movement on the diameter φ of the center o of the concave portion 2 is increased.

  Further, when Example 7, Example 6 and Example 8 are compared, the surface area of the conductor part 1 depends on the ratio of the diameter φ of the conductor part 1 and the radius r of the concave part 2 as described above. If the increase in Ld is determined and the ratio of the radius r of the concave portion 2 to the diameter φ of the conductor portion 1 is increased, the surface area Ld of the conductor portion 1 is increased. The diameter φ of the portion 1 is 0.4 mm and the radius r of the concave portion 2 is 0.04 mm, whereas in Example 6, the diameter φ of the conductor portion 1 is 0.5 mm and the radius of the concave portion 2 is r is 0.05 mm, and the ratios of the diameter φ of the conductor part 1 and the radius r of the concave part 2 are the same in the three examples of Example 6, Example 7 and Example 8, but in this case It was found that the surface area Ld increases as the angle θ and the installation angle α are smaller.

  That is, in Example 7, the angle θ is 12.413 ° and the installation angle α is 155.174 °, whereas in Example 6 and Example 8, the angle θ is 12.48 °, and the installation angle Since the installation angle α is 155.04 ° in Example 6 and the installation angle α is 167.7 ° in Example 8, Example 7 has an angle θ relative to Example 6 and Example 8. It was also found that the surface area Ld of the conductor portion 1 increases because the installation angle α is small.

  In general, according to [Table 1], when the diameter φ of the conductor part 1 is 0.1 mm to 1 mm, preferably 0.3 mm to 0.6 mm, more preferably about 0.4 mm, the surface area of the conductor part 1 It has been found that Ld increases and the high-frequency current conduction is efficiently exhibited.

  Further, it was found that the surface area Ld of the conductor portion 1 increases when the radius r of the concave portion 2 is 0.03 to 0.06 mm, preferably 0.04 mm. Thus, the radius r of the concave portion 2 is 0.03 to 0.06 mm, preferably 0.04 mm, whereas the installation angle α corresponding to the concave portion 2 provided on the surface of the conductor portion 1 is , 155.04 ° to 168.522 °, and preferably set to 155.174 ° as shown in Example 7, the surface area of the conductor portion 1 is extremely increased, and high-frequency current conduction is efficiently performed. It was found that it was demonstrated.

  The method for determining the increase in the surface area of the high-frequency electric wire and the conductor portion according to the present invention is such that the surface area of the conductor portion is effectively increased instead of the number of concave portions formed in the longitudinal direction on the outer peripheral surface of the conductor portion. This is a field where high-frequency current conduction is improved, and it is suitable for producing high-strength electric wires with high accuracy and high production efficiency even with a thin wire diameter of 1 mm or less, and also at a low production cost.・ Suitable for use.

FIG. 1 shows a first embodiment of the high-frequency electric wire according to the present invention, and is a cross-sectional view of the first embodiment. FIG. 2 is a perspective view of the same. 3 is also an enlarged sectional view for explanation. FIG. 4 also shows a second embodiment of the present invention and is a cross-sectional view of a conductor portion. FIG. 5 is an enlarged sectional view for explanation. FIG. 6 also shows a third embodiment of the present invention and is a cross-sectional view of a conductor portion. FIG. 7 is an enlarged sectional view for explanation. FIG. 8 similarly shows a fourth embodiment of the present invention and is a cross-sectional view of a conductor portion. FIG. 9 is an enlarged sectional view for explanation. FIG. 10 similarly shows a fifth embodiment of the present invention and is a cross-sectional view of a conductor portion. FIG. 11 is an enlarged sectional view for explanation. FIG. 12 also shows a sixth embodiment of the present invention and is a cross-sectional view of a conductor portion. FIG. 13 is an enlarged sectional view for explanation. FIG. 14 similarly shows a seventh embodiment of the present invention and is a cross-sectional view of a conductor portion. FIG. 15 is an enlarged sectional view for explanation. FIG. 16 also shows an eighth embodiment of the present invention, and is a cross-sectional view of the conductor portion. FIG. 17 is an enlarged sectional view for explanation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conductor part 2 Concave part J1 Extension line J2 Extension line Ld Surface area M 2 Divided line O Center Q Tangent Q 'Line T Intersection T' Intersection X Longitudinal direction l ₀ Periphery length l ₁ Arc l ' ₀ Conductor part 1 perimeter length l ′ ₁ arc o center q1 extension line q2 extra battle r radius r ′ radius φ diameter θ angle α installation angle β angle δ travel

Claims (11)

  A conductor portion having a round cross section is formed by a good electric conductor, and a concave portion having a circular arc shape or a U-shaped cross section drawn on the surface with a desired radius r is provided over the longitudinal direction with an interval on the outer peripheral surface. A high-frequency electric wire characterized in that a plurality of appropriate portions are provided, and the concave portion is formed on the surface of a conductor portion having a diameter φ.   The conductor part is a metal made of copper, aluminum, iron, or an alloy thereof, or conductive fine particles such as metal fibers and carbon black dispersed in plastic, or a conductive plastic such as an organic conductive polymer compound, The high-frequency electric wire according to claim 1, wherein the high-frequency electric wire is formed of any one of conductive non-ferrous metals.   As for the surface area of the conductor portion, the outer peripheral length of the conductor portion corresponding to the arc of the plurality of concave portions is appropriately reduced from the product of the diameter φ and the circumference ratio of the conductor portion, and the arc of the plurality of concave portions is appropriately added. The high-frequency electric wire according to claim 1 or 2, wherein the high-frequency electric wire is increased by the above.   2. The surface area of the conductor part is increased by determining a ratio of the radius r of the concave part formed on the outer peripheral surface of the conductor part corresponding to the diameter φ of the conductor part. 4. A high-frequency electric wire according to claim 2 or claim 3.   The surface area of the conductor part is such that a concave part having a circular arc shape or a U-shaped cross section formed on the outer peripheral surface of the conductor part connects both ends of the arc of the concave part and the center of the outer peripheral circle of the conductor part. By drawing a center on each diameter of the conductor part drawn for each concave part as a bisector that bisects the narrow angle formed by two extension lines, the outer circumference circle of the conductor part is drawn The surface area can be selected by selecting a predetermined angle as the installation angle of the concave portion as a left-right angle between a tangent line drawn at the intersection where the diameters intersect and an extension line connecting the intersection and both ends of the arc. The high-frequency electric wire according to claim 1, 2, 3, or 4, wherein the electric wire is increased.   The concave portion is formed at a desired radius from the center set by moving inward from the outer circumference of the conductor portion on the diameter. The high frequency electric wire according to claim 4 or 5.    The diameter φ of the conductor portion is 0.1 to 1 mm, preferably 0.3 to 0.6 mm, and more preferably about 0.4 mm. The high-frequency wire according to claim 3, claim 5, claim 6, and claim 6.   The radius r of the concave portion is formed to be 0.03 to 0.06 mm, preferably 0.04 mm. The high frequency electric wire according to claim 6 or 7.   The radius r of the concave portion is 0.03 to 0.06 mm, preferably 0.04 mm, whereas the installation angle α corresponding to the concave portion provided on the surface of the conductor portion is 155.04 ° to The surface area of the conductor portion is selected by setting the angle to 168.522 °, preferably 155.174 °. Claim 5, Claim 6, Claim 7, Claim 8 high frequency electric wire.   The surface area of the conductor part having a round cross section by the good electric conductor is such that the concave part having a circular arc shape or U-shaped cross section formed on the outer peripheral surface of the conductor part is formed between both ends of the arc of the concave part and the conductor part. By processing the conductor portion so as to be drawn by setting the center on the diameter φ of the conductor portion as a bisector that bisects the included angle formed by two extension lines connecting the center of the outer circumference circle, The installation angle of the concave portion is selected as a predetermined angle as a left-right angle between a tangent line drawn at an intersection where the diameter intersects and an extension line connecting the intersection and both ends of the arc. A method for determining the increase in the surface area of the conductor portion of the high-frequency electric wire, characterized by increasing the surface area.   The concave portion is formed at a desired radius from a center set on the diameter by moving inward from the outer circumference of the conductor portion on the diameter. To determine the increase in surface area of

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