JPH04124720U - high frequency coaxial cable - Google Patents

Abstract

(57) [Summary] [Purpose] A high-frequency coaxial cable consisting of an insulator, an outer conductor, and a sheath sequentially provided outside an inner conductor,
To provide something with excellent bending resistance and excellent electrical characteristics. [Structure] The internal conductor 1 is made of Cu ₃ Zr by performing intermediate heat treatment on a copper alloy in which the total amount of additive elements containing at least Zr is 0.005 to 0.5% by weight at an intermediate wire diameter up to the final wire diameter.
A stranded conductor made of high-strength, high-conductivity copper alloy fine wire that is cold-drawn to the final wire diameter and then heat-treated at a temperature lower than the intermediate heat treatment temperature to leave non-recrystallized grains. And so.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a high-frequency coaxial cable with excellent bending resistance and excellent electrical characteristics. Regarding ru.

0002

[Conventional technology]

Conventionally, high-frequency coaxial cables are used for connecting high-frequency equipment, internal wiring, etc. As specified in JISC-3501, polyethylene insulating vinyl sheath High-frequency coaxial cables are commonly used, but cables for mobile equipment and cables for robots are It is not suitable for applications that require bending resistance, such as lead wires for cables and sensors. these In applications where the cable is subject to repeated bending loads, the internal conductor is typically stranded conductors made of annealed copper wire or tin-plated annealed copper wire may cause disconnection. It is because of watermelon.

0003 Therefore, the applicant first developed a Cu-Fe-P based copper alloy with excellent bending resistance for the internal conductor. We proposed a high-frequency coaxial cable using a stranded conductor consisting of thin wires (Public Application No. 1-12 5248).

0004

[Problem that the idea aims to solve]

However, this stranded conductor of Cu-Fe-P copper alloy fine wire has excellent bending resistance. However, the conductivity is low at around 80%, and improvements in electrical characteristics such as attenuation are required. there was.

[0005] This invention was made in response to that demand, and its purpose is to provides high frequency coaxial cables with excellent bending resistance and electrical characteristics. It's about doing.

[0006]

[Means for Solving the Problems] A high-frequency coaxial cable that achieves the above object has an inner conductor made of a copper alloy having a final wire diameter of 0.005 to 0.5% by weight of additive elements including at least Zr. After performing intermediate heat treatment at an intermediate wire diameter to precipitate Cu ₃ Zr, cold wire drawing is performed to the final wire diameter, and further heat treatment is performed at a temperature lower than the intermediate heat treatment temperature to leave non-recrystallized grains. The stranded wire conductor is made of high-strength, high-conductivity copper alloy thin wire (hereinafter referred to as Cu-Zr copper alloy thin wire). In addition to the inner conductor, the outer conductor is a braided conductor made of Cu-Zr based copper alloy fine wire. Preferably, the insulator is made of a polyolefin thermoplastic elastomer, and the sheath is made of a fluororesin elastomer.

[0007]

[Effect]

The internal conductor, which is prone to breakage due to repeated bending loads, is not only flex resistant but also conductive. The stranded conductor is made of fine Cu-Zr copper alloy wire, which has excellent bending resistance. Therefore, a high frequency coaxial cable with excellent electrical characteristics can be obtained. Also, outside The conductor is also a braided conductor using Cu-Zr copper alloy fine wire, which further improves durability. It also has excellent flexibility and electrical properties. And polyolefin for insulation By using a thermoplastic elastomer and a fluororesin elastomer for the sheath. It has excellent flexibility, oil resistance, and chemical resistance.

[0008]

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings and tables. Figure 1 shows the high frequency of this invention. FIG. 2 is a cross-sectional view of a coaxial cable. High frequency coaxial cable has an insulator on the outside of the inner conductor 1. 2, an outer conductor 3, and a sheath 4 are arranged concentrically in this order. And inside The conductor 1 is a stranded conductor of Cu-Zr copper alloy fine wire, and the insulator 2 is a polyolefin conductor. The outer conductor 3 is Cu-Zr based thermoplastic elastomer or polyethylene. Braided conductor of copper alloy fine wire or annealed copper wire, and the sheath is PVC or fluorine resin elastomer. It's Tomah.

[0009]As described in the specification of Japanese Patent Application No. 2-3056-48, the Cu-Zr based copper alloy thin wires of the inner conductor 1 and the outer conductor 3 are subjected to intermediate heat treatment at an intermediate wire diameter and then cold wire drawn. The amount of Cu ₃ Zr precipitated is increased, the electrical conductivity is increased, and the mechanical properties are improved.Furthermore, the final heat treatment at a lower temperature than the intermediate heat treatment is applied to the final wire diameter to leave non-recrystallized grains and to improve the uniformity. It has excellent mechanical strength such as bending resistance and tensile strength, and high electrical conductivity. If the total amount of additional elements including Zr is less than 0.005% by weight, the mechanical strength will not improve, and if it exceeds 0.5% by weight, the electrical conductivity and wire drawability will deteriorate. In addition, other additive elements of Zr include Au, Ag, Al, B, Be, Bi, Ca, Cd, Co, Cr, Fe, Ge, Hf, In, Mg, Mn, Ni, P, Pb, S b , Si, Sn, Ti, Y, Zn, and misch metal (referring to a mixture of rare earth elements mainly consisting of Ca and Ce).

0010 The polyolefin thermoplastic elastomer used as the insulator 2 has a small dielectric constant. Therefore, the transmission characteristics as a high frequency coaxial cable are ensured. Also, as sheath 4 Fluororesin elastomer has excellent flexibility, so thermoplastic elastomer for insulation Together with Tomer's good flexibility, it further improves the flexibility of the entire cable. Ru. Fluororesin elastomer is a fluorine-containing elastic copolymer with crystalline fluororesin. It is obtained by graft polymerization, and has thermoplasticity at high temperatures and rubber elasticity at room temperature. It has the following. There are various types of fluororesin elastomers, but 30m After leaving the test piece pressed to a thickness of m at room temperature for more than a day and night, JISK6301 Hardness of 85 or less according to the spring type hardness test (Type A) specified in is preferably 70 or more and 80 or less.

[0011] Next, a specific example of a combination of the inner conductor 1, insulator 2, outer conductor 3, and sheath 4 is shown below. and its performance will be explained while comparing examples and comparative examples.

0012 In Example 1, as the internal conductor 1, Zr was 0.03 wt% and In was 0.07 wt%. % copper alloy rough drawn wire (11 mm) with an intermediate wire diameter of 0.5 mm at 500°C for 3 hours. After an intermediate heat treatment, the wire was drawn to 0.08 mmφ and the final heat treatment was carried out at 350°C for 3 hours. 30 heat-treated Cu-Zr copper alloy thin wires are twisted together and have an outer diameter of 0.51 mm. The insulator 2 is coated with polyethylene to have an outer diameter of 1.60 mm, and the outer conductor is 3, a Cu-Zr copper alloy thin wire with a wire diameter of 0.01 mmφ and the same composition was braided at a braid density of 9. 5% braided to have an outer diameter of 2.10 mm, and PVC was used as the sheath 4 with a pressure type clip. Extrusion coating was performed using a loss head to give an outer diameter of 2.50 mm.

[0013] In Example 2, the internal conductor 1 contains 0.05 wt% Zr and 0.15 wt% In. % copper alloy rough drawn wire (11 mm) with an intermediate wire diameter of 0.5 mm at 500°C for 3 hours. After an intermediate heat treatment between 30 heat-treated Cu-Zr copper alloy thin wires are twisted together and have an outer diameter of 0.51 mm. "Sumitomo TPE5260" (Sumitomo Chemical Co., Ltd. polyolefin) was used as the insulator 2. (trade name of fin-based thermoplastic elastomer) to have an outer diameter of 1.60 mm. As the conductor 3, annealed copper wire with a wire diameter of 0.1 mmφ is braided to a braiding density of 95% to have an outer diameter of 2. 10 mm, and the sheath 4 was Cefural Soft (fluorine manufactured by Central Glass Co., Ltd.). Resin elastomer (trade name) is extruded and coated with a pressure type crosshead to create an outer diameter of 2. ．． It was set to 50 mm.

[0014] In Comparative Example 1, as the internal conductor 1, Fe was 0.2 wt% and P was 30 wt% of Fe. Thirty 0.08 mmφ Cu-Fe-P copper alloy thin wires containing The outer diameter is 0.51 mm, and the outer diameter is 1.60 m by covering polyethylene as the insulator 2. m, and the outer conductor 3 is a Cu-Fe-P copper alloy with a wire diameter of 0.1 mmφ and the same composition. Fine gold wire was braided to a braid density of 95% to have an outer diameter of 2.10 mm, and the sheath 4 was made of PV. C was extrusion coated using a pressure type crosshead to give an outer diameter of 2.50 mm.

[0015] Comparative example 2 is a set of seven tin-plated annealed copper wires with a diameter of 0.18 mm as the internal conductor 1. Twist it to have an outer diameter of 0.54 mm, cover it with polyethylene as the insulator 2, and make it have an outer diameter of 1 mm. ．． 60 mm, and the outer conductor 3 is annealed copper wire with a wire diameter of 0.1 mmφ at a braid density of 95%. The outer diameter is 2.10mm, and the sheath 4 is made of PVC pressure type cloth. Extrusion coating was performed using a head to give an outer diameter of 2.50 mm.

[0016] The results of the following tests are shown for Examples 1 and 2 and Comparative Examples 1 and 2 above. Shown in 1.

[0017]

[Table 1]

[0018] Regarding the bending resistance in Table 1, as shown in Figure 2, a guide rod with a radius (R) of 7 mm is used. Insert cable B into cables A and A, attach a 500g weight W to the bottom end, and place the top end to the left and right. Each wire was swung by 90 degrees, and the number of bends until all of the internal conductors 1 were broken was measured. Ta However, the left and right reciprocation was performed once, and the bending speed was the same for both left and right reciprocations. Regarding the amount of attenuation Measurements were made using the tuning method at a frequency of 10 MHz.

[0019] Example 1 corresponding to claim 2 has a smaller attenuation amount than Comparative Example 1. . Example 2 corresponding to claim 1 or 3 has a smaller attenuation amount than Comparative Example 1. Compared to Comparative Example 2, the amount of attenuation is somewhat larger, but the bending resistance is greater. It also has excellent flexibility, oil resistance, and chemical resistance.

[0020]

[Effect of the idea] In the invention as claimed in claim 1, the internal conductor is a stranded conductor made of Cu-Zr based copper alloy thin wire. Therefore, it has excellent not only bending resistance but also electrical conductivity. The invention according to claim 2 provides an internal Similar to the conductor, the outer conductor is made of stranded Cu-Zr copper alloy wire, making it even more conductive. It also has excellent electrical properties. In the third aspect of the invention, the inner conductor and the outer conductor are Cu-Zr based. Copper alloy thin wire, and polyolefin thermoplastic elastomer and silicone as the insulator. By using fluororesin elastomer for the base, it has flexibility, oil resistance and chemical resistance. It is also excellent.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a high frequency coaxial cable of the present invention.

FIG. 2 is a diagram showing a bending resistance test.

[Explanation of symbols]

1 Internal conductor 2 Insulator 3 Outer conductor 4 Sheath

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Nobuhiro Fujio 2-3-1 Iwatacho, Higashiosaka City, Osaka Prefecture Within Tsuta Electric Wire Co., Ltd. (72) Creator Mitsuo Ishizaka 2-3-1 Iwatacho, Higashiosaka City, Osaka Prefecture Within Tsuta Electric Wire Co., Ltd. (72) Creator Kazumasa Eguchi 2-3-1 Iwatacho, Higashiosaka City, Osaka Prefecture Within Tsuta Electric Wire Co., Ltd. (72) Creator Kanezo Ide 2-3-1 Iwatacho, Higashiosaka City, Osaka Prefecture Within Tsuta Electric Wire Co., Ltd. (72) Creator Sajiro Shimizu 2-3-1 Iwatacho, Higashiosaka City, Osaka Prefecture Within Tsuta Electric Wire Co., Ltd. (72) Inventor: Kenji Jono 2-3-1 Iwatacho, Higashiosaka City, Osaka Prefecture Within Tsuta Electric Wire Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A high-frequency coaxial cable comprising an insulator, an outer conductor, and a sheath sequentially provided outside an inner conductor, wherein the inner conductor has a total amount of additive elements containing at least Zr of 0.005 to 0.5 weight. % copper alloy is subjected to intermediate heat treatment at an intermediate wire diameter up to the final wire diameter to precipitate Cu ₃ Zr, then cold drawn to the final wire diameter, and further heat treated at a temperature lower than the intermediate heat treatment temperature. A high-frequency coaxial cable characterized in that it is a stranded conductor made of high-strength, high-conductivity copper alloy thin wires with residual non-recrystallized grains. 2. The high frequency coaxial cable according to claim 1, wherein the outer conductor is made of a copper alloy having a total amount of additive elements of 0.005 to 0.5% by weight, including at least Zr, and is an intermediate wire up to the final wire diameter. After performing intermediate heat treatment at the wire diameter to precipitate Cu ₃ Zr, cold wire drawing is performed to the final wire diameter, and further heat treatment is performed at a temperature lower than the intermediate heat treatment temperature to create a high-strength, high-strength wire with non-recrystallized grains remaining. A high-frequency coaxial cable characterized by a braided conductor made of conductive copper alloy thin wire. 3. The high frequency coaxial cable according to claim 1, wherein the insulator is made of polyolefin thermoplastic elastomer and the sheath is made of fluororesin elastomer.