Shielded cable

Abstract

To provide a shielded cable with good noise immunity and high resistance to bending and other movements. [Solution] The shielded cable 1 comprises a bundled core 3 made by twisting together a plurality of electric wires 2, a bundled shield layer 4 that covers the bundled core 3 collectively, and a sheath 5 that covers the bundled shield layer 4. The bundled shield layer 41 has a first shield layer 41 made by spirally winding a plurality of first metal strands 41a, and a second shield layer 42 made by spirally winding a plurality of second metal strands 42a around the first shield layer 41. The winding direction of the first metal strands 41a in the first shield layer 41 and the winding direction of the second metal strands 42a in the second shield layer 42 are in the same direction, and the outer diameter of the second metal strands 42a is 1.2 times or more and 1.7 times or less the outer diameter of the first metal strands 41a.

Description

Technical Field

[0001] The present invention relates to a shielded cable.

Background Art

[0002] Conventionally, the influence of external disturbance noise on electronic devices and cables has been a problem. In particular, in the medical field, there has been a problem that high-frequency noise generated when using devices with high output such as electric scalpels has an adverse effect on other medical devices and the like. In order to minimize the influence of external disturbance noise in a cable, reducing the gap between the strands in the shield layer is one of the effective means.

[0003] Patent Document 1 discloses a shielded cable provided with a collective shield layer that collectively covers the peripheries of a plurality of electric wires, and the collective shield layer is composed of two layers of horizontally wound shields. By making the collective shield layer into two layers, the gap between the strands can be reduced, and the resistance to external disturbance noise (hereinafter referred to as noise resistance) can be improved.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in a shielded cable used for an endoscope or an ultrasonic diagnostic apparatus, operations such as bending, twisting, and swinging (hereinafter referred to as operations such as bending) are repeatedly applied during use. Therefore, mechanical stress associated with operations such as bending is repeatedly applied to the shielded cable.

[0006] When the conventional shielded cables described above are used in endoscopes or ultrasound diagnostic equipment, there is a problem in that the two-layer shielding structure makes it easy for the metal wires of the inner and outer layers to rub against each other and experience friction when repeatedly subjected to bending or other movements, which can easily cause the metal wires constituting the shielding layer to break.

[0007] Therefore, the present invention aims to provide a shielded cable that has good noise immunity and high resistance to bending and other movements. [Means for solving the problem]

[0008] The present invention aims to solve the above problems and provides a shielded cable comprising: a bundled core made by twisting together a plurality of electric wires; a bundled shield layer that covers the periphery of the bundled core collectively; and a sheath that covers the periphery of the bundled shield layer, wherein the bundled shield layer comprises a first shield layer formed by spirally winding a plurality of first metal strands, and a second shield layer formed by spirally winding a plurality of second metal strands around the first shield layer, wherein the winding direction of the first metal strands in the first shield layer and the winding direction of the second metal strands in the second shield layer are in the same direction, and the outer diameter of the second metal strands is 1.2 times or more and 1.7 times or less the outer diameter of the first metal strands. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a shielded cable that has good noise immunity and high resistance to bending and other movements. [Brief explanation of the drawing]

[0010] [Figure 1] This is a cross-sectional view showing a cross-section perpendicular to the longitudinal direction of a shielded cable according to one embodiment of the present invention. [Figure 2] This is a diagram illustrating the bending test. [Modes for carrying out the invention]

[0011] [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0012] Figure 1 is a cross-sectional view showing a cross-section perpendicular to the longitudinal direction of the shielded cable 1 according to this embodiment. The shielded cable 1 is used in applications where bending, twisting, swinging, and other such movements (hereinafter referred to as bending, etc.) are repeatedly applied. More specifically, the shielded cable 1 according to this embodiment is used, for example, as a cable for an endoscope.

[0013] The shielded cable 1 comprises a bundled core 3 formed by twisting together multiple electric wires 2, a bundled shield layer 4 that collectively covers the bundled core 3, and a sheath 5 that covers the bundled shield layer 4. In this specification, the term "shielded cable" refers to a multi-core cable equipped with a bundled shield layer 4.

[0014] In shielded cable 1, for example, a portion of the integrated shielding layer 4 may fall into the gaps between the electric wires 2, making it difficult for the metal strands 41a and 42a constituting the integrated shielding layer 4 to be neatly aligned in a circular shape. Therefore, damage to the integrated shielding layer 4 tends to be more pronounced when the shielded cable 1 is repeatedly subjected to bending or other movements. As will be described in detail later, in this embodiment, in order to suppress such damage to the integrated shielding layer 4, the wear of the metal strands 41a and 42a is suppressed by appropriately selecting the outer diameter of the metal strands 41a and 42a. The parts of shielded cable 1 will be described in detail below.

[0015] (Electric wire 2) The shielded cable 1 comprises three wires 2. The three wires 2 consist of two coaxial cables 21 and one insulated wire 22. The number of wires 2 is not limited to that shown in the figure; it may be two or fewer, or four or more. Furthermore, the wires 2 constituting the shielded cable 1 may consist only of coaxial cables 21, or only of insulated wire 22.

[0016] (Coaxial line 21) The two coaxial cables 21 are used for transmitting signals such as image signals. Each of the two coaxial cables 21 has an inner conductor 211, an insulator 212 surrounding the inner conductor 211, an outer conductor 213 surrounding the insulator 212, and a jacket layer 214 surrounding the outer conductor 213. The two coaxial cables 21 have exactly the same configuration. However, multiple electric wires 2 may include coaxial cables 21 with different configurations such as size.

[0017] The internal conductor 211 of the coaxial cable 21 consists of a compressed stranded conductor formed by twisting together multiple (in this case, seven) metal strands 211a and then lightly compressing them to create a roughly circular cross-sectional shape. This configuration allows for a large conductor cross-sectional area while reducing the conductor's outer diameter, contributing to the overall reduction in the diameter of the shield cable 1. Furthermore, the increased contact area between adjacent metal strands 211a reduces contact resistance, thereby improving the conductivity of the internal conductor 211 and enhancing its electrical characteristics.

[0018] Silver-plated copper alloy wire was used as the metal strand 211a constituting the internal conductor 211. This configuration allows for improved mechanical strength while suppressing a decrease in conductivity, resulting in an internal conductor 211 that is less prone to breakage even with a small diameter.

[0019] For the insulator 212 of the coaxial cable 21, a fluororesin that can be molded into a thin wall is preferable. Here, a PFA (tetrafluoroethylene-perfluoroalkoxyethylene copolymer) was used as the insulator 212.

[0020] As the outer conductor 213 of the coaxial cable 21, a horizontally wound shield was used, in which multiple metal strands 213a were spirally wound around the insulator 212. This configuration improves resistance to bending and other movements, and also prevents the outer conductor 213 from becoming too thick and increasing the diameter of the coaxial cable 21. As the metal strands 213a constituting the outer conductor 213 were silver-plated copper alloy wires with high conductivity and mechanical strength, similar to the metal strands 211a constituting the inner conductor 211.

[0021] As the jacket layer 214 of the coaxial line 21, similar to the insulator 212, a fluororesin that can be formed into a thin film may be used. Here, a jacket layer 214 made of PFA was used. The outer diameter of the jacket layer 214, that is, the outer diameter of the coaxial line 21, was set to 0.182 mm.

[0022] (Insulated wire 22) The insulated wire 22 is used for transmitting low-speed signals such as control signals or for power supply. The insulated wire 22 has a conductor 221 and an insulator 222 that covers the periphery of the conductor 221. The conductor 221 is composed of a stranded conductor in which (here, seven) metal strands 221a are twisted together. As the metal strands 221a constituting the conductor 221, similar to the metal strands 211a and 213a of the coaxial line 21, silver-plated copper alloy wires with high conductivity and high mechanical strength were used. Also, as the insulator 222, similar to the insulator 212 and the jacket layer 214 of the coaxial line 21, a fluororesin that can be formed into a thin film was used. Here, an insulator 222 made of PFA was used. The outer diameter of the insulator 222, that is, the outer diameter of the insulated wire 22, was set to 0.140 mm.

[0023] (Bundle core 3) The bundle core 3 is formed by twisting two coaxial lines 21 and one insulated wire 22 together. In the present embodiment, the outer diameter of the bundle core 3 is 0.37 mm. The twisting direction of the bundle core 3, the twisting direction of the inner conductor 211 of the coaxial line 21, the winding direction of the outer conductor 213, and the twisting direction of the conductor 221 of the insulated wire 22 are all in the same direction. That is, the twisting direction of the bundle core 3 is the same as the twisting direction of the conductors of the wires 2 constituting the bundle core 3. By configuring it in this way, stress concentration when the shielded cable 1 is subjected to operations such as bending (especially twisting operations) can be suppressed, and the resistance to operations such as bending can be improved. <0000

[0024] Here, the twisting direction of the bundled core 3 is the direction in which the wire 2 rotates from one end to the other, as viewed from one end of the bundled core 3. The twisting direction of the inner conductor 211 is the direction in which the metal strands 211a rotate from one end to the other, as viewed from one end of the coaxial cable 21. The winding direction of the outer conductor 213 is the direction in which the metal strands 213a rotate from one end to the other, as viewed from one end of the coaxial cable 21. And the twisting direction of the conductor 221 is the direction in which the metal strands 221a rotate from one end to the other, as viewed from one end of the insulated cable 22.

[0025] Furthermore, the aggregated core 3 does not contain intervening materials such as fiber intervening. This configuration makes it possible to suppress the increase in diameter of the shield cable 1.

[0026] (Bind Tape 6) A binding tape 6 is wrapped around the bundled core 3 to hold it in place and prevent the twist from unraveling. The binding tape 6 is wrapped spirally around the bundled core 3 so that a portion of its width overlaps. A resin tape can be used as the binding tape 6. In this embodiment, a binding tape 6 made of PEEK (polyether ether ketone) was used.

[0027] (Single Shield Layer 4) The unified shielding layer 4 is a layer designed to improve noise immunity for multiple power lines 2 and is connected to the so-called frame ground. The outer conductor 213 of the coaxial cable 21 is connected to the so-called signal ground and has a different purpose than the unified shielding layer 4.

[0028] The integrated shielding layer 4 consists of a two-layer horizontally wound shield. The integrated shielding layer 4 has a first shielding layer 41 made by spirally winding multiple first metal strands 41a, and a second shielding layer 42 made by spirally winding multiple second metal strands 42a around the first shielding layer 41. By configuring it in this way, the gaps between the strands can be reduced and noise immunity can be improved compared to when the integrated shielding layer 4 is made of a single horizontally wound shield.

[0029] Furthermore, in this embodiment, the winding direction of the first metal strand 41a in the first shield layer 41 (hereinafter referred to as the winding direction of the first shield layer 41) and the winding direction of the second metal strand 42a in the second shield layer 42 (hereinafter referred to as the winding direction of the second shield layer 42) are the same. By configuring it in this way, stress concentration when bending or other movements (especially twisting movements) are applied to the shield cable 1 can be suppressed, and resistance to bending and other movements can be improved. In this embodiment, in order to further improve resistance to bending and other movements, the winding directions of the first and second shield layers 41 and 42, the twisting direction of the bundled core 3, the twisting direction of the inner conductor 211 of the coaxial cable 21, the winding direction of the outer conductor 213, and the twisting direction of the conductor 221 of the insulated wire 22 are all the same.

[0030] Furthermore, in this embodiment, the outer diameter of the second metal strand 42a is set to be between 1.2 and 1.7 times the outer diameter of the first metal strand 41a. By setting the outer diameter of the second metal strand 42a to 1.2 times or more the outer diameter of the first metal strand 41a, it is possible to suppress the second metal strand 42a from falling into the valleys between adjacent first metal strands 41a in the circumferential direction, thereby suppressing wear of the metal strands 41a and 42a due to bending and other movements. In addition, by setting the outer diameter of the second metal strand 42a to 1.7 times or less the outer diameter of the first metal strand 41a, it is possible to suppress an increase in the diameter of the shield cable 1. Furthermore, by setting the outer diameter of the second metal strand 42a to 1.7 times or less the outer diameter of the first metal strand 41a, it is possible to suppress an increase in the gaps between strands due to the number of second metal strands 42a being too small, thereby suppressing a decrease in noise immunity. Furthermore, if the outer diameter of the second metal strand 42a becomes too large, the gaps between adjacent second metal strands 42a in the circumferential direction also become larger, causing indentations corresponding to these gaps on the outer surface of the shielded cable 1, resulting in a deterioration of its appearance. By setting the outer diameter of the second metal strand 42a to 1.7 times or less the outer diameter of the first metal strand 41a, such deterioration of appearance can be suppressed. From the viewpoint of suppressing the increase in diameter of the shielded cable 1, improving noise immunity, and suppressing deterioration of appearance, it is preferable that the outer diameter of the second metal strand 42a be 1.2 times or more and less than 1.5 times the outer diameter of the first metal strand 41a.

[0031] The winding angle of the second shield layer 42 is preferably larger than the winding angle of the first shield layer 41. By configuring it in this way, the second shield layer 42, which experiences relatively large stress when subjected to bending or other movements, can have its resistance to bending and other movements increased by increasing the winding angle. Conversely, the first shield layer 41, which experiences relatively small stress when subjected to bending and other movements, can have its winding angle decreased to suppress the deterioration of electrical characteristics. As a result, it becomes possible to achieve both high resistance to bending and other movements and good electrical characteristics. Generally, in horizontally wound shields, the larger the winding angle, the higher the resistance to bending and other movements, but electrical characteristics tend to deteriorate as the winding angle increases. Here, the winding angle of the second shield layer 42 is the angle that the second metal strand 42a makes with respect to the longitudinal direction of the cable. The winding angle of the first shield layer 41 is the angle that the first metal strand 41a makes with respect to the longitudinal direction of the cable.

[0032] More specifically, the winding angle of the second shield layer 42 should be 10° or more. More preferably, it should be 17° or more. This configuration makes it less likely for the second metal wire 42a to break when subjected to bending or other movements, thereby further improving resistance to bending and other movements. The winding angle of the electric wire 2 in the bundled core 3 (hereinafter referred to as the winding angle of the bundled core 3) should be smaller than the winding angles of both shield layers 41 and 42, and it is desirable that the relationship (winding angle of bundled core 3) < (winding angle of the first shield layer 41) < (winding angle of the second shield layer 42) is satisfied.

[0033] Furthermore, the number of second metal strands 42a constituting the second shield layer 42 should be less than or equal to the number of first metal strands 41a constituting the first shield layer 41. By configuring it in this way, the outer diameter of the second metal strands 42a is set to be larger than that of the first metal strands 41a, thereby suppressing wear of both metal strands 41a and 42a and improving resistance to bending and other movements. However, if the number of second metal strands is too small, issues such as an increased diameter of the shield cable 1 and a decrease in noise immunity will occur, so the number of second metal strands 42a should be between 0.9 and 1.0 times the number of first metal strands 41a.

[0034] In this embodiment, silver-plated copper alloy wires with high conductivity and mechanical strength were used as the first metal wire 41a and the second metal wire 42a. Furthermore, 45 first metal wires 41a with an outer diameter of 0.025 mm were used to construct the first shield layer 41, and 43 second metal wires 42a with an outer diameter of 0.030 mm were used to construct the second shield layer 42. In this case, the outer diameter of the second metal wires 42a is 1.2 times the outer diameter of the first metal wires 41a. Also, the number of second metal wires 42a is 0.96 times the number of first metal wires 41a. In addition, in this embodiment, the ratio of winding pitch P to core diameter PD in the first shield layer 41, P / PD, was set to 6.4, and the P / PD of the second shield layer 42 was set to 6.3. In this case, the winding angle of the first shield layer 41 is 26.1°, and the winding angle of the second shield layer 42 is 26.5°.

[0035] (Sheath 5) The sheath 5 is a layer that protects the bundled core 3 and the unified shielding layer 4. It is desirable to use a fluororesin that can be molded into a thin wall for the sheath 5. Here, a sheath 5 made of PFA was used. It is desirable that the thickness of the sheath 5 be slightly thicker than the outer diameter of the second metal wire 42a. More specifically, the thickness of the sheath 5 should be between 1.0 and 1.3 times the outer diameter of the second metal wire 42a. By configuring it in this way, it is possible to suppress cracking of the sheath 5 when repeated bending and other movements are applied, while suppressing an increase in the diameter of the shield cable 1. In this embodiment, the thickness of the sheath 5 was set to 0.035 mm. In this case, the thickness of the sheath 5 is 1.17 times the outer diameter of the second metal wire 42a. The outer diameter of the sheath 5, i.e., the outer diameter of the shield cable 1, is 2.00 mm or less, more preferably 1.00 mm or less, and in this embodiment it was set to 0.56 mm.

[0036] (Manufacturing method for shielded cable 1) When manufacturing the shielded cable 1, first, the wires 2 (in this case, two coaxial wires 21 and one insulated wire 22) are twisted together to form a bundled core 3. Then, the binding tape 6 is spirally wrapped around the bundled core 3. At this time, the binding tape 6 is wrapped so that a portion of the width of the binding tape 6 overlaps.

[0037] Subsequently, multiple first metal wires 41a are spirally wound around the binding tape 6 to form the first shield layer 41. At this time, the first metal wires 41a are wound so that the winding angle of the first shield layer 41 is greater than the winding angle of the assembled core 3.

[0038] Subsequently, a second shield layer 42 is formed by spirally winding multiple second metal wires 42a around the first shield layer 41. In this process, the second metal wires 42a used have an outer diameter of 1.2 to 1.7 times, more preferably 1.2 to less than 1.5 times, that of the outer diameter of the first metal wire 41a. Furthermore, the winding of the second metal wires 42a is carried out so that the winding angle of the second shield layer 42 is greater than the winding angle of the first shield layer 41.

[0039] Subsequently, a sheath 5 is formed around the second shield layer 42 by extrusion molding. To prevent the resin constituting the sheath 5 from penetrating the second shield layer 42, the sheath 5 is preferably formed by tube extrusion molding. This completes the shield cable 1 shown in Figure 1.

[0040] (Bending test) A prototype shield cable 1 shown in Figure 1 was fabricated and subjected to a bending test. In the bending test, as shown in Figure 2, a weight with a load W = 100gf was suspended from the lower end of the shield cable 1 under test, and curved bending jigs 100 were placed on both sides of the shield cable 1. The shield cable 1 was then repeatedly bent alternately to the left and right along the bending jig 100, applying a predetermined bending angle X and a predetermined bending radius R. The bending speed was 30 times / minute, and one bending cycle consisted of one back-and-forth movement. The resistance value between both ends of the shield cable 1 was measured at appropriate intervals of bending. The resistance values ​​were measured for the inner conductor 211 and outer conductor 213 of the coaxial cable 21, the conductor 221 of the insulated wire 22, and the unified shield layer 4. Breakage was considered to have occurred when at least one of the resistance values ​​measured during the bending test increased by 15% compared to the resistance value before the bending test (initial resistance value). When a bending test was performed on the shielded cable 1 with a bending angle X of 120° and a bending radius R of 15 times the cable's outer diameter, it was confirmed that no breakage occurred after 90,000 bending cycles, confirming that a shielded cable 1 with sufficiently high resistance to bending and other movements has been realized. The inventors have investigated and confirmed that the shielded cable 1 according to this embodiment has a durability of at least 90,000 cycles in a bending test with a bending angle of 90° or more, a load of 50g or more, and a bending radius of 15 times the cable's outer diameter or less.

[0041] (Operation and Effects of the Embodiment) As described above, in the shielded cable 1 according to this embodiment, the single shield layer 4 comprises a first shield layer 41 formed by spirally winding a plurality of first metal strands 41a, and a second shield layer 42 formed by spirally winding a plurality of second metal strands 42a around the first shield layer 41. The winding direction of the first metal strands 41a in the first shield layer 41 and the winding direction of the second metal strands 42a in the second shield layer 42 are the same, and the outer diameter of the second metal strands 42a is 1.2 times or more and 1.7 times or less the outer diameter of the first metal strands 41a.

[0042] By configuring the cable in this way, noise immunity is improved by using two layers of shielding, while simultaneously reducing the contact area between the first metal strand 41a constituting the first shielding layer 41 and the second metal strand 42a constituting the second shielding layer 42, thereby suppressing wear of the metal strands 41a and 42a when subjected to bending or other movements. In other words, according to this embodiment, a shielded cable with good noise immunity and high resistance to bending and other movements can be realized.

[0043] For example, if an endoscope cable has low resistance to external noise (noise immunity), problems such as image interruptions or distortion may occur when using high-output equipment such as an electrosurgical unit. By using the shielded cable 1 according to this embodiment as an endoscope cable, it is possible to suppress such problems and also sufficiently satisfy the resistance to bending and other movements required for endoscopes.

[0044] (Summary of the embodiments) Next, the technical concept understood from the embodiments described above will be described using the reference numerals and other symbols from the embodiments. However, the reference numerals and other symbols in the following description are not limited to the components in the claims that are specifically shown in the embodiments.

[0045] [1] A shielded cable (1) comprising a bundled core (3) made of multiple electric wires (2) twisted together, a bundled shield layer (4) that covers the bundled core (3) in one piece, and a sheath (5) that covers the bundled shield layer (4), wherein the bundled shield layer (41) has a first shield layer (41) formed by spirally winding multiple first metal strands (41a), and a second shield layer (42) formed by spirally winding multiple second metal strands (42a) around the first shield layer (41), wherein the winding direction of the first metal strands (41a) in the first shield layer (41) and the winding direction of the second metal strands (42a) in the second shield layer (42) are in the same direction, and the outer diameter of the second metal strands (42a) is 1.2 times or more and 1.7 times or less the outer diameter of the first metal strands (41a).

[0046] [2] The shielded cable (1) according to [1], wherein the outer diameter of the second metal wire (42a) is 1.2 times or more and less than 1.5 times the outer diameter of the first metal wire (41a).

[0047] [3] The shielded cable (1) according to [1], wherein the winding angle of the second shield layer (42), which is the angle that the second metal strand (42a) makes with respect to the longitudinal direction of the cable, is greater than the winding angle of the first shield layer (41), which is the angle that the first metal strand (41a) makes with respect to the longitudinal direction of the cable.

[0048] [4] The shielded cable (1) according to [3], wherein the winding angle of the second shield layer (42) is 10° or more.

[0049] [5] The shielded cable (1) according to [1], wherein the number of second metal strands (42a) constituting the second shield layer (42) is less than or equal to the number of first metal strands (41a) constituting the first shield layer (41).

[0050] [6] A shielded cable (1) as described in [1] that has durability of 90,000 cycles or more in a bending test with a bending angle of 90° or more, a load of 50g or more, and a bending radius of 15 times or less the outer diameter of the cable.

[0051] (Note) Although embodiments of the present invention have been described above, the embodiments described above do not limit the invention as defined in the claims. Furthermore, it should be noted that not all combinations of features described in the embodiments are necessarily essential for solving the problem of the invention. In addition, the present invention can be implemented with appropriate modifications without departing from its spirit. [Explanation of Symbols]

[0052] 1…Shielded cable 2...Electric wire 21…Coaxial line 22...Insulated wires 3…Collective Core 4…Single Shield Layer 41...First Shield Layer 41a...first metal wire 42...Second Shield Layer 42a...Second metal wire 5…Sheath

Claims

1. A bundled core made by twisting together multiple electric wires, A single shielding layer that covers the periphery of the aforementioned aggregated core, The system comprises a sheath that covers the periphery of the aforementioned bulk shield layer, The aforementioned integrated shield layer comprises a first shield layer formed by spirally winding a plurality of first metal wires, and a second shield layer formed by spirally winding a plurality of second metal wires around the first shield layer. The winding direction of the first metal wire in the first shield layer and the winding direction of the second metal wire in the second shield layer are in the same direction. The outer diameter of the second metal wire is 1.2 times or more and 1.7 times or less the outer diameter of the first metal wire. Shielded cable.

2. The outer diameter of the second metal wire is 1.2 times or more and less than 1.5 times the outer diameter of the first metal wire. The shielded cable according to claim 1.

3. The winding angle of the second shield layer, which is the angle that the second metal strand makes with respect to the longitudinal direction of the cable, is greater than the winding angle of the first shield layer, which is the angle that the first metal strand makes with respect to the longitudinal direction of the cable. The shielded cable according to claim 1.

4. The winding angle of the second shield layer is 10° or more. The shielded cable according to claim 3.

5. The number of second metal strands constituting the second shield layer is less than the number of first metal strands constituting the first shield layer. The shielded cable according to claim 1.

6. In a bending test with a bending angle of 90° or more, a load of 50g or more, and a bending radius of 15 times or less the outer diameter of the cable, it exhibits durability of 90,000 cycles or more. The shielded cable according to claim 1.

Images