Drum fixture for evaluating high-speed communication lines, and method for winding communication lines using the drum fixture for evaluating high-speed communication lines

Abstract

To provide a drum fixture for evaluating high-speed communication lines that can improve workability when inspecting communication lines and suppress deterioration of inspection quality, and a method for winding a communication line using the drum fixture for evaluating high-speed communication lines.SOLUTION: A drum fixture 100 for evaluating high-speed communication lines comprises: a main body 10; multiple rail portions 11 attached to the main body at intervals from one another and each extending along a height direction of the main body; and multiple hook portions 12 attached to the multiple rail portions and arranged in a spiral shape around a central axis along the height direction. The multiple hook portions 12 support a communication line LN wound in a spiral shape around the central axis.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a drum jig for evaluating a high-speed communication line and a method for winding a communication line using the drum jig for evaluating a high-speed communication line. [Background technology]

[0002] Patent Document 1 discloses a communication cable testing device used to inspect a communication cable (communication line) in which connectors are connected to both ends of a multi-pair cable. Conventionally, when inspecting (testing) a communication line, the communication line is spirally wound around the outer circumferential surface of a cylindrical drum jig and fixed with tape. At this time, the communication line is wound around the drum jig at a constant interval in the height direction. In such a configuration, during the process of winding the communication line around the drum jig, the communication line may slip off the drum jig due to its own weight before being fixed with tape, causing the interval of the communication line spirally wound around the drum jig to change depending on the location. The change in the interval of the communication line spirally wound around the drum jig may cause a decrease in inspection quality. In addition, when returning the position of the communication line that has slipped off to the correct position, additional work is required, which may cause a decrease in the workability of the winding process. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 1-201174 Summary of the Invention [Problem to be solved by the invention]

[0004] In a drum jig used for inspecting communication lines, there is still room for improvement in terms of improving workability when inspecting the communication lines and suppressing deterioration in inspection quality.

[0005] An object of the present invention is to provide a drum jig for evaluating high-speed communication lines that can improve workability when inspecting communication lines and suppress deterioration of inspection quality, and a method for winding a communication line using the drum jig for evaluating high-speed communication lines. [Means for solving the problem]

[0006] The drum jig for evaluating high-speed communication lines of the present invention comprises a cylindrical main body portion, a plurality of rail portions attached to the main body portion at intervals along the circumferential direction of the main body portion, each of which extends along the height direction of the main body portion, and a plurality of hook portions attached to the plurality of rail portions and arranged in a spiral shape around a central axis along the height direction of the main body portion, wherein the plurality of hook portions support a communication line wound in a spiral shape around the central axis.

[0007] The method for winding a communication line using the drum jig for evaluating high-speed communication lines of the present invention is characterized by including a first step of attaching a plurality of rail portions extending in the height direction of the main body portion to a cylindrical main body portion, arranged at intervals along the circumferential direction of the main body portion; a second step of attaching a plurality of hook portions to each of the rail portions, arranged in a spiral shape around a central axis along the height direction of the main body portion; and a third step of winding the communication line in a spiral shape around the central axis around the outer circumferential surface of the main body portion so as to be supported by the hook portions. Effect of the Invention

[0008] The drum jig for evaluating high-speed communication lines and the method for winding a communication line using the drum jig for evaluating high-speed communication lines according to the present invention have the effect of improving workability when inspecting a communication line and suppressing deterioration of inspection quality. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a drum jig for evaluating a high-speed communication line according to an embodiment. [Diagram 2] FIG. 2 is an enlarged perspective view showing a rail portion and a hook portion of the drum jig for evaluating a high-speed communication line according to the embodiment. [Diagram 3] FIG. 3 is an enlarged perspective view showing a rail portion and a hook portion of the drum jig for evaluating a high-speed communication line according to the embodiment. [Figure 4] FIG. 4 is an enlarged perspective view showing a rail portion and a hook portion of the drum jig for evaluating a high-speed communication line according to the embodiment. [Diagram 5] FIG. 5 is a plan view showing the movement of the hook portion in the drum jig for evaluating a high-speed communication line according to the embodiment. [Figure 6] FIG. 6 is a flow chart showing a method for winding a communication line using a drum jig for evaluating a high-speed communication line according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a drum jig for evaluating high-speed communication lines and a method for winding a communication line using the drum jig for evaluating high-speed communication lines according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to these embodiments. In addition, the components in the following embodiments include those that can be easily imagined by a person skilled in the art or those that are substantially the same.

[0011] [Embodiment] An embodiment will be described with reference to Fig. 1 to Fig. 6. The embodiment relates to a drum jig for evaluating a high-speed communication line and a drum jig for evaluating a high-speed communication line. Fig. 1 is a perspective view showing the drum jig for evaluating a high-speed communication line according to the embodiment, Fig. 2 is an enlarged perspective view showing a rail portion and a hook portion of the drum jig for evaluating a high-speed communication line according to the embodiment, Fig. 3 is an enlarged perspective view showing the rail portion and the hook portion of the drum jig for evaluating a high-speed communication line according to the embodiment, Fig. 4 is an enlarged perspective view showing the rail portion and the hook portion of the drum jig for evaluating a high-speed communication line according to the embodiment, Fig. 5 is a plan view showing the movement of the hook portion in the drum jig for evaluating a high-speed communication line according to the embodiment, and Fig. 6 is a flow chart showing a method for winding a communication line using the drum jig for evaluating a high-speed communication line according to the embodiment.

[0012] The high-speed communication line evaluation drum jig 100 of the embodiment is a device used for inspecting (testing) the communication line LN. The high-speed communication line evaluation drum jig 100 can be used, for example, for inspecting (testing) high-speed communication lines such as shielded electric wires. The high-speed communication line evaluation drum jig 100 can also be used for inspecting (testing) multi-pair cables (twisted pair electric wires) in which electric wires are twisted together in pairs. As shown in FIG. 1, the high-speed communication line evaluation drum jig 100 includes a main body portion 10, a rail portion 11, and a hook portion 12.

[0013] In this specification, the direction from the lower surface (bottom surface) of the cylindrical main body 10 to the upper surface is referred to as the upward direction, and the direction opposite to the upward direction is referred to as the downward direction. The direction along the upward and downward directions is referred to as the height direction. The central axis of the main body 10 is a straight line passing through the center of the lower surface and the center of the upper surface of the cylindrical main body 10. The direction along the central axis of the main body 10 is referred to as the circumferential direction.

[0014] The main body 10 is formed in a cylindrical shape. The main body 10 of the embodiment is hollow inside, and a test device is provided inside the main body 10, which can inspect (test) the communication line LN by applying a constant voltage to both ends of the communication line LN and measuring the current value of the current flowing through the communication line LN. A first connector (not shown) for connecting one end of the communication line LN to the test device is provided on the upper surface in the height direction of the main body 10. The first connector is configured to connect with the connector provided at one end of the communication line LN. A second connector (not shown) for connecting the other end of the communication line LN to the test device is provided on the outer peripheral surface of the lower part in the height direction of the main body 10. The second connector is configured to connect with the connector provided at the other end of the communication line LN.

[0015] The test device has, for example, a voltage generating means for generating a constant voltage between the first connector and the second connector, and a current value measuring means for measuring the current value of the current flowing between the first connector and the second connector. The test device inspects the communication line LN by generating a voltage between the first connector and the second connector with the voltage generating means, and measuring the current value of the current flowing between the first connector and the second connector with the current value measuring means. Through this inspection (test), the high-speed communication line evaluation drum jig 100 can detect, for example, breaks, crosstalk, short circuits, etc. of the communication line LN.

[0016] In the embodiment, a plurality of rail portions 11 are attached to the outer peripheral surface of the main body portion 10. The rail portions 11 are attached at intervals from one another along the circumferential direction of the main body portion 10, and each extends along the height direction of the main body portion 10. For example, the rail portion 11 is provided with a fixing portion for fixing the rail portion 11 to the main body portion 10 with a screw or the like. In this case, a through hole for inserting the screw is provided in the fixing portion of the rail portion 11, and a screw hole is provided in the main body portion 10 at a position corresponding to the through hole. The rail portion 11 is fixed to the main body portion 10 by inserting a screw into the through hole of the fixing portion of the rail portion 11 and screwing it into the screw hole of the main body portion 10.

[0017] Here, since the value of the relative dielectric constant of the rail portion 11 affects the signal transmission performance of the communication line LN, it is preferable that the value be as small as possible. In the embodiment, the rail portion 11 is formed so that the value of the relative dielectric constant is greater than 0 and equal to or less than 1.4.

[0018] For example, the rail portion 11 is made of ferrosilicon having a relative dielectric constant of 1.38. Alternatively, the rail portion 11 may be made of polystyrene so that the relative dielectric constant is about 1.05.

[0019] The rail portions 11 are configured to allow the hook portions 12 to be attached thereto. As shown in Fig. 2, each of the rail portions 11 in the embodiment includes a first rail portion 11a and a second rail portion 11b. Each of the rail portions 11 also includes a bottom wall portion 11c that connects the first rail portion 11a and the second rail portion 11b. When fixed to the main body portion 10, each of the first rail portion 11a and the second rail portion 11b is formed in a rectangular prism shape extending along the height direction.

[0020] In one rail portion 11, the first rail portion 11a and the second rail portion 11b are disposed with a gap G1 therebetween. The gap G1 between the first rail portion 11a and the second rail portion 11b in the circumferential direction is set to a size sufficient to hold the hook portion 12. In the embodiment, the first rail portion 11a and the second rail portion 11b are connected in the circumferential direction by the bottom wall portion 11c.

[0021] The bottom wall portion 11c is disposed on the outer peripheral surface side of the main body portion 10 relative to the first rail portion 11a and the second rail portion 11b when the rail portion 11 is attached to the main body portion 10. At this time, a U-shaped groove recessed toward the outer peripheral surface of the main body portion 10 is formed between the first rail portion 11a and the second rail portion 11b in the rail portion 11. The first rail portion 11a and the second rail portion 11b form side walls of the groove of the rail portion 11, and the bottom wall portion 11c forms a bottom wall of the groove of the rail portion 11. The hook portion 12 is attached so as to be fitted into the groove of the rail portion 11.

[0022] At least one of the first rail portion 11a and the second rail portion 11b has a plurality of protrusions P1 each protruding toward the other rail portion (the second rail portion 11b or the first rail portion 11a) and arranged at intervals along the height direction. In the embodiment, the plurality of protrusions P1 are provided only on the second rail portion 11b. In the second rail portion 11b, a recess R1 is formed between the protrusions P1 adjacent to each other in the height direction. The recess R1 is recessed in an arc shape toward the opposite side to the other rail portion side (the first rail portion 11a side) relative to the protrusions P1.

[0023] At least one of the first rail portion 11a and the second rail portion 11b is configured as a deformable leaf spring so that an external force widens the gap G1 between the first rail portion 11a and the second rail portion 11b. In the embodiment, the second rail portion 11b is configured as a deformable leaf spring so that an external force widens the gap G1 between the first rail portion 11a and the second rail portion 11b.

[0024] The hook portion 12 is configured so as to be attachable to the rail portion 11. Here, the value of the relative dielectric constant of the hook portion 12 is preferably as small as possible, since it affects the signal transmission performance of the communication line LN, similar to the rail portion 11. In the embodiment, the hook portion 12 is formed so that the value of the relative dielectric constant is greater than 0 and equal to or less than 1.4.

[0025] For example, the hook portion 12 is formed using ferrosilicon with a relative dielectric constant value of 1.38. Alternatively, for example, the hook portion 12 may be formed using polystyrene so that the relative dielectric constant is about 1.05.

[0026] The hook portion 12 includes an engagement portion 12a, a support portion 12b, and a locking portion 12c. The engagement portion 12a is a portion of the rail portion 11 that is sandwiched and held between the first rail portion 11a and the second rail portion 11b.

[0027] The engaging portion 12a includes a base portion 12aa, a connecting portion 12ab, and a protruding portion 12ac. When the hook portion 12 is attached to the rail portion 11, the base portion 12aa is formed in a flat plate shape that spreads along the height direction and the circumferential direction. Here, the base portion 12aa is a rectangular plate shape with the height direction as the longitudinal direction. A cylindrical support portion 12b protrudes toward the opposite side to the main body portion 10 from the surface (front surface) of the base portion 12aa located opposite to the main body portion 10 side.

[0028] The support portion 12b is a portion of the hook portion 12 that supports the communication line LN. A locking portion 12c is provided at an end of the support portion 12b opposite to the end connected to the base portion 12aa. The locking portion 12c is a portion that locks the communication line LN from the side so that the communication line LN does not slip off the support portion 12b. In the embodiment, the locking portion 12c is formed in a cylindrical shape that protrudes upward from the end of the support portion 12b, and the support portion 12b and the locking portion 12c form an L shape.

[0029] A connecting portion 12ab protrudes from the surface (rear surface) of the base portion 12aa located on the main body portion 10 side. The height direction width of the connecting portion 12ab is substantially equal to the height direction width of the base portion 12aa, and the circumferential width of the connecting portion 12ab is shorter than the circumferential width of the base portion 12aa. A plate-shaped protruding portion 12ac is formed at the end of the connecting portion 12ab opposite to the end on the base portion 12aa side. The height direction width of the protruding portion 12ac is substantially equal to the height direction width of the connecting portion 12ab. In addition, the circumferential width of the protruding portion 12ac is shorter than the circumferential width of the base portion 12aa, and longer than the circumferential width of the connecting portion 12ab.

[0030] The protrusion 12ac is a portion that is sandwiched and held between the first rail portion 11a and the second rail portion 11b. The protrusion 12ac has a convex portion P2 that is in a circular arc shape. The convex portion P2 protrudes toward the second rail portion 11b when the protrusion 12ac is attached to the rail portion 11, and is formed so as to engage with a concave portion R1 of the second rail portion 11b. When the protrusion 12ac is sandwiched between the first rail portion 11a and the second rail portion 11b, the convex portion P2 engages with the concave portion R1, so that the hook portion 12 is held between the first rail portion 11a and the second rail portion 11b, and the height position of the hook portion 12 is fixed.

[0031] 1 and 3, a plurality of hook portions 12 are attached to each rail portion 11. As shown in Fig. 3, the hook portions 12 are attached to each rail portion 11 at regular intervals in the height direction. As shown in Fig. 4, the rail portion 11 and the hook portions 12 are configured so that the height position of the hook portions 12 can be changed by applying an external force to the hook portions 12 in the height direction.

[0032] FIG. 5 is a plan view for explaining the manner of movement of the hook portion 12, and for the sake of explanation, a portion of the hook portion 12 other than the protrusion 12ac is omitted. As shown in FIG. 5, when an external force in the height direction is applied to the hook portion 12, the protrusion 12ac pushes the gap between the first rail portion 11a and the second rail portion 11b widens, and the protrusion P2 of the hook portion 12 climbs over the protrusion P1 of the second rail portion 11b and moves along the height direction. The hook portion 12 can change its height position by engaging the protrusion P2 with the recess R1 at an arbitrary height position. Although FIGS. 4 and 5 show an example in which the hook portion 12 is moved downward, the hook portion 12 can also be moved in the opposite direction (from downward to upward).

[0033] 1, the multiple hook portions 12 are arranged in a spiral shape around the central axis of the main body portion 10. In FIG. 1, the multiple hook portions 12 are arranged in a counterclockwise spiral shape with respect to the central axis of the main body portion 10.

[0034] In the drum jig 100 for evaluating high-speed communication lines according to the embodiment, when inspecting (testing) the communication line LN, the communication line LN is hung on the support parts 12b of the hook parts 12, wound in a spiral shape around the central axis of the main body part 10, and the end part of the communication line LN is connected to the connector of the drum jig 100 for evaluating high-speed communication lines. By supporting the communication line LN with the hook parts 12, it is possible to prevent the communication line LN from slipping off the main body part 10 due to its own weight. In addition, it is possible to prevent a deterioration in the inspection quality of the communication line caused by a change in the position of the communication line LN wound in a spiral shape around the central axis of the main body part 10.

[0035] Next, a description will be given of a method for winding the communication line LN using the high-speed communication line evaluation drum jig 100 according to the embodiment. The method for winding the communication line LN using the high-speed communication line evaluation drum jig 100 according to the embodiment includes a first step S1, a second step S2, and a third step S3.

[0036] 6, the first step S1 is a step of attaching rail portions 11 to the cylindrical main body portion 10. In the first step S1 of the embodiment, a plurality of rail portions 11 extending in the height direction of the cylindrical main body portion 10 are attached to the cylindrical main body portion 10, arranged at intervals along the circumferential direction of the main body portion 10. The rail portions 11 are fixed to the main body portion 10 with, for example, screws or the like.

[0037] The second step S2 is a step of attaching the hook portion 12 to the rail portion 11. In the second step S2 of the embodiment, the hook portions 12 are attached to each of the rail portions 11 in a spiral arrangement around a central axis along the height direction of the main body portion 10. In the second step, as shown in FIG. 4, the hook portion 12 is attached to the rail portion 11 by inserting the protruding portion 12ac from the end portion of the rail portion 11 (here, the upper end of the rail portion 11) between the first rail portion 11a and the second rail portion 11b and moving the hook portion 12 downward to a predetermined height position along the height direction. At this time, by applying an external force to the hook portion 12 downward in the height direction, the convex portion P2 of the protruding portion 12ac of the hook portion 12 can move over the convex portion P1 of the second rail portion 11b. By applying an external force to the hook portion 12 until the hook portion 12 reaches a predetermined height position, the hook portion 12 can be attached to the rail portion 11.

[0038] Here, the spacing in the height direction between the multiple hook portions 12 attached to each rail portion 11 is substantially equal to the spacing in the height direction between the communication lines LN wound around the high-speed communication line evaluation drum jig 100. The spacing in the height direction between the multiple hook portions 12 attached to each rail portion 11 is set so that the spacing in the height direction between the communication lines LN is preferable for inspecting (testing) the communication lines LN.

[0039] The third step S3 is a step of spirally winding the communication line LN around the central axis of the main body 10. In the third step S3, the communication line LN is spirally wound around the central axis of the main body 10 around the outer circumferential surface of the main body 10 and supported by the hook portion 12. In the third step, the communication line LN is wound around the drum jig 100 for evaluating high-speed communication lines.

[0040] In the embodiment, connectors are provided on both ends of the communication line LN, one connector is connected to a first connector of the main body part 10, and the other connector is connected to a second connector of the main body part 10. For example, the communication line LN performs the third step with one connector connected to the first connector of the main body part 10, and after completing the third step, the other connector of the communication line LN is connected to the second connector, thereby connecting the communication line LN to the test device of the main body part 10.

[0041] After performing the above operations, the test device of the main body unit 10 is started up, whereby the communication line LN can be inspected (tested).

[0042] As described above, the drum jig 100 for evaluating high-speed communication lines of this embodiment comprises a cylindrical main body 10, a plurality of rail portions 11 attached to the main body 10 at intervals along the circumferential direction of the main body 10 and each extending along the height direction of the main body 10, and a plurality of hook portions 12 attached to the plurality of rail portions 11 and arranged in a spiral shape around a central axis along the height direction of the main body 10, and the plurality of hook portions (12) are characterized in that they support the communication line LN wound spirally around the central axis.

[0043] The drum jig 100 for evaluating high-speed communication lines according to the embodiment supports the communication line LN with the hook portion 12, thereby preventing the communication line LN from slipping off from the main body portion 10. This configuration prevents the need for additional correction work (work to return the communication line to a predetermined height position) that occurs when the communication line LN slips off from the main body portion 10, improving workability when inspecting the communication line LN. In addition, it is possible to prevent a decrease in the inspection quality of the communication line caused by a change in the position of the communication line LN wound in a spiral shape around the central axis of the main body portion 10.

[0044] Moreover, in the drum jig 100 for evaluating high-speed communication lines according to the embodiment, each of the multiple rail portions 11 includes a first rail portion 11a and a second rail portion 11b that can hold the hook portion 12 by sandwiching it in the circumferential direction, and at least one of the first rail portion 11a and the second rail portion 11b has multiple protrusions P1 that protrude toward the other first rail portion 11a or the second rail portion 11b and are arranged at intervals along the height direction, and are configured like a leaf spring that can deform so that an external force widens the gap G1 between the first rail portion 11a and the second rail portion 11b. When an external force in the height direction is applied to the hook portion 12, the hook portion 12 is configured to be able to push out the gap G1 between the first rail portion 11a and the second rail portion 11b, overcome the protrusions P1, and move along the height direction.

[0045] In the high-speed communication line evaluation drum jig 100 according to the embodiment, the height position of the hook portion 12 can be changed with respect to the rail portion 11, and the interval between the communication lines LN in the height direction can be easily set.

[0046] In addition, in the high-speed communication line evaluation drum jig 100 according to the embodiment, the value of the relative dielectric constant in the plurality of rail portions 11 and the plurality of hook portions 12 is greater than 0 and equal to or less than 1.4.

[0047] In the drum jig 100 for evaluating high-speed communication lines according to the embodiment, the dielectric constant of the rail portion 11 and hook portion 12 arranged around the communication line LN is set to 1.4 or less, thereby reducing the effect on the signal transmission performance of the communication line, and the inspection quality of the communication line LN can be improved compared to when the rail portion 11 and hook portion 12 are formed from a material having a dielectric constant exceeding 1.4.

[0048] As described above, the method of winding the communication line LN using the drum jig 100 for evaluating high-speed communication lines according to the embodiment is characterized by including a first step S1 of attaching a plurality of rail portions 11 extending in the height direction of the main body portion 10 to the cylindrical main body portion 10, arranged at intervals along the circumferential direction of the main body portion 10; a second step S2 of attaching a plurality of hook portions 12 to each of the rail portions 11, arranged in a spiral shape around a central axis along the height direction of the main body portion 10; and a third step S3 of winding the communication line LN in a spiral shape around the central axis around the outer circumferential surface of the main body portion 10 to be supported by the hook portions 12.

[0049] In the winding method of the communication line LN using the drum jig 100 for evaluating high-speed communication lines according to the embodiment, the communication line LN is supported by the hook portion 12, so that the communication line LN can be prevented from slipping off from the main body portion 10. This configuration can prevent the occurrence of additional correction work (work to return the communication line to a predetermined height position) that occurs when the communication line LN slips off from the main body portion 10, improving the workability when inspecting the communication line LN. In addition, it is possible to prevent a decrease in the inspection quality of the communication line caused by a change in the position of the communication line LN wound in a spiral shape around the central axis of the main body portion 10.

[0050] [Variations] In the above embodiment, the configuration in which the convex portion P1 is provided on the second rail portion 11b has been described, but the present invention is not limited to this configuration. For example, the convex portion P1 may be provided on both the first rail portion 11a and the second rail portion 11b. Specifically, the first rail portion 11a and the second rail portion 11b may have a plurality of convex portions that protrude toward the other rail portion (the second rail portion 11b or the first rail portion 11a) and are arranged at intervals in the height direction. In the first rail portion 11a and the second rail portion 11b, the respective convex portions are provided at substantially the same height position in the first rail portion 11a and the second rail portion 11b, and the first rail portion 11a and the second rail portion 11b are formed to have a shape that is line-symmetrical with respect to a center line extending along the height direction between the first rail portion 11a and the second rail portion 11b.

[0051] In this case, the arc-shaped convex portion P2 of the protrusion 12ac is provided to protrude both on the first rail portion 11a side and the second rail portion 11b side. The convex portion P2 of the protrusion 12ac protruding toward the first rail portion 11a side is provided to engage with a concave portion between the convex portions of the first rail portion 11a, and the convex portion P2 of the protrusion 12ac protruding toward the second rail portion 11b side is provided to engage with a concave portion between the convex portions of the second rail portion 11b. The first rail portion 11a and the second rail portion 11b are formed in a leaf spring shape that can be deformed to widen the gap G1 between the first rail portion 11a and the second rail portion 11b, and when an external force in the height direction is applied to the hook portion 12, the convex portion P2 of the hook portion 12 rides over the convex portions of the first rail portion 11a and the convex portions of the second rail portion 11b, so that the hook portion 12 can be moved along the height direction.

[0052] The contents disclosed in the above-described embodiments and modifications can be implemented in appropriate combinations. [Explanation of symbols]

[0053] 10: main body portion, 11: rail portion, 11a: first rail portion, 11b: second rail portion 11c: bottom wall portion, 12: hook portion, 12a: engagement portion, 12b: support portion, 12c: locking portion 12aa: base, 12ab: connection, 12ac: protrusion 100: Drum fixture for evaluating high-speed communication lines LN: communication line, P1, P2: convex parts, R1: concave parts S1: 1st process, S2: 2nd process, S3: 3rd process

Claims

1. A cylindrical main body portion; A plurality of rail portions are attached to the main body portion at intervals along a circumferential direction of the main body portion, each of the rail portions extending along a height direction of the main body portion; a plurality of hook portions attached to the plurality of rail portions and arranged in a spiral shape around a central axis along the height direction of the main body portion; Equipped with the plurality of hook portions support a communication line wound in a spiral shape around the central axis. A drum jig for evaluating high speed communication lines.

2. Each of the plurality of rail portions includes a first rail portion and a second rail portion capable of holding the hook portion by sandwiching the hook portion in the circumferential direction, At least one of the first rail portion and the second rail portion has a plurality of protrusions that protrude toward the other of the first rail portion or the second rail portion and are arranged at intervals along the height direction, and is configured like a leaf spring that can be deformed so that an interval between the first rail portion and the second rail portion increases due to an external force, When an external force in the height direction is applied to the hook portion, the hook portion is configured to be movable along the height direction by pushing the gap between the first rail portion and the second rail portion and climbing over the protrusion.

2. The drum jig for evaluating high speed communication lines according to claim 1.

3. a dielectric constant value of the rail portions and the hook portions is greater than 0 and is equal to or less than 1.4; 3. The drum jig for evaluating a high-speed communication line according to claim 1 or 2.

4. a first step of attaching a plurality of rail portions extending in a height direction of the cylindrical main body portion to the main body portion in a circumferential direction of the main body portion at intervals; a second step of attaching a plurality of hook portions to each of the rail portions in a spiral manner around a central axis along the height direction of the main body portion; a third step of winding a communication line in a spiral shape around the central axis on an outer circumferential surface of the main body and supporting the communication line on the hook portion; 1. A method for winding a communication line using a drum jig for evaluating high-speed communication lines, comprising:

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