Method of assembling a multi-core cable and method of manufacturing a multi-core cable assembly

Abstract

The present invention provides a method for assembling a multi-core cable capable of reducing the crossing of insulated electric wires and a method for manufacturing a multi-core cable assembly. A method for connecting insulated electric wires to electrode patterns corresponding to circuit boards at both ends of a multi-core cable, the insulated electric wires (2) are arranged in alignment on a plane at both ends of a multi-core cable (1), the crossing coefficients of the insulated electric wires on the one end side and the other end side when one end of each insulated electric wire (2) is connected to an electrode pattern (12) of one circuit board (11) and the other end is connected to an electrode pattern (12) corresponding to another circuit board (11) are calculated by a computer, and the connection targets of the electrode patterns (12) of the plurality of insulated electric wires (2) are determined by the computer in such a manner that the maximum crossing coefficient, which is the larger one of the crossing coefficients on the one end side and the other end side, becomes smaller by repeatedly changing the connection target of one end of each insulated electric wire (2) to calculate the crossing coefficients.

Description

Technical Field

[0001] This invention relates to a method for assembling multi-core cables and a method for manufacturing multi-core cable assemblies. Background Technology

[0002] Previously, multi-core cables were known to consist of multiple insulated wires, each having an insulator on its conductor, covered together with a sheath. For example, multi-core cables used as detector cables in medical applications, and multi-core cables containing dozens to hundreds of insulated wires (such as coaxial cables), are also known. Circuit boards are connected to both ends of the multi-core cable, and the electrode patterns corresponding to the two circuit boards are electrically connected to each other via any insulated wires. An assembly with circuit boards at both ends of a multi-core cable is called a multi-core cable assembly.

[0003] It should be noted that, as prior art information related to the invention of this application, there is Patent Document 1.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 60-091580 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, when connecting multiple insulated wires to the electrode patterns on the circuit board at both ends of a multi-core cable, the insulated wires will cross each other. If there are too many crosses, the crossed sections will become stiff and difficult to bend, making them prone to breakage when forced into a bend. While breakage can be suppressed by using protective covers, this increases costs and restricts the wiring flexibility of the multi-core cable. Therefore, it is necessary to minimize the number of crosses between insulated wires to reduce the risk of breakage.

[0009] It should be noted that although it is possible to arrange the insulated wires with minimal crossings at one end of a multi-core cable, if the connection target (electrode pattern) of the insulated wires at one end is determined, the connection target at the other end of the insulated wires is also determined. Therefore, there is a concern that a large number of crossings may occur at the other end of the multi-core cable. To reduce the aforementioned risk of wire breakage, it is necessary to minimize the crossings of the insulated wires at both ends of the multi-core cable.

[0010] Therefore, the object of the present invention is to provide a method for assembling a multi-core cable and a method for manufacturing a multi-core cable assembly that can reduce the crossing of insulated wires at both ends of the multi-core cable.

[0011] Methods for solving problems

[0012] To address the aforementioned issues, this invention provides a method for assembling a multi-core cable. The method involves connecting the multiple insulated wires and a sheath covering them to electrode patterns corresponding to circuit boards at both ends of the multi-core cable. The method aligns the multiple insulated wires neatly on a plane at both ends of the multi-core cable. A computer is used to determine which electrode pattern corresponds to the first electrode pattern on one circuit board, and which electrode pattern corresponds to the second electrode pattern on another circuit board. The electrode pattern is determined by the cross coefficients of the insulated wires at one end and the other end of the multi-core cable. The connection target at one end of the multi-core cable is changed, and the connection target at the other end of the multi-core cable is changed accordingly. The cross coefficients at one end and the other end of the multi-core cable are calculated using the computer in this case. The above operation is repeated so that the maximum cross coefficient representing any larger cross coefficient at one end and the other end of the multi-core cable is reduced. The connection target of the multi-core cable is determined using the computer.

[0013] Furthermore, to address the aforementioned issues, the present invention also provides a method for manufacturing a multi-core cable assembly. This method comprises a multi-core cable assembly having a multi-core cable and a circuit board. The multi-core cable has multiple insulated wires and a sheath covering the multiple insulated wires. The circuit board is disposed at both ends of the multi-core cable and has electrode patterns connected to the multiple insulated wires. The multiple insulated wires are arranged neatly on a plane at both ends of the multi-core cable. A computer is used to determine the electrode patterns for connecting one end of each insulated wire to one of the circuit boards and connecting the other end of each insulated wire to... When determining the cross coefficients of the insulated wires at one end and the other end of the multi-core cable in the electrode pattern corresponding to another circuit board, and changing the connection target at one end of the multi-core cable while changing the connection target at the other end of the multi-core cable, the computer calculates the cross coefficients at one end and the other end of the multi-core cable in this case. The above operation is repeated to reduce the maximum cross coefficient representing any larger cross coefficient at one end and the other end of the multi-core cable, and the computer determines the electrode pattern for the connection target of the multi-core cable.

[0014] Invention Effects

[0015] According to the present invention, a method for assembling a multi-core cable and a method for manufacturing a multi-core cable assembly are provided, which can reduce the crossing of insulated wires at both ends of the multi-core cable. Attached Figure Description

[0016] Figure 1(a) is a schematic cross-sectional view of a multi-core cable perpendicular to its length direction, and Figure 1(b) is a cross-sectional view of an insulated wire perpendicular to its length direction.

[0017] Figure 2 This is a schematic diagram of the structure of a multi-core cable assembly.

[0018] Figure 3 A flowchart illustrating the steps of a method for manufacturing a multi-core cable assembly.

[0019] Figure 4 A diagram illustrating the process of neatly arranging items.

[0020] Figure 5 A flowchart for determining the process steps to connect the target.

[0021] Figures 6(a) to 6(d) A diagram illustrating the process of determining the connection target.

[0022] Figure 7(a) is a diagram illustrating the determination of the cross length, and Figure 7(b) is a graph showing the relationship between the cross coefficient and the cross length.

[0023] Figure 8 A graph showing the change in the maximum crossover coefficient (km) relative to the number of searches.

[0024] Symbol Explanation

[0025] 1: Multi-core cable; 2: Insulated wire; 3: Shielding layer; 4: Sheath; 10: Multi-core cable assembly; 11: Circuit board; 12: Electrode pattern. Detailed Implementation

[0026] [Implementation Method]

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0028] (Multi-core cable)

[0029] Figure 1(a) is a schematic cross-sectional view of a multi-core cable perpendicular to its length direction, and Figure 1(b) is a cross-sectional view of an insulated wire perpendicular to its length direction.

[0030] As shown in Figures 1(a) and 1(b), the multi-core cable 1 has multiple insulated wires 2 and a sheath 4 covering the multiple insulated wires 2. In this embodiment, the multiple insulated wires 2 are twisted together, and a shielding layer 3 made of braided shielding is provided around it, and the sheath 4 is covered around the shielding layer 3. The multi-core cable 1 is, for example, a multi-core cable used in medical detector cables.

[0031] In this multi-core cable 1, the insulated wire 2 uses a coaxial cable 20 with an insulator 22, an outer conductor 23, and an outer sheath 24 arranged sequentially around the outer periphery of the inner conductor 21. However, it is not limited to this; the insulated wire 2 can also be a wire without an outer conductor 23 and an outer sheath 24. The outer diameter of the coaxial cable 20 is, for example, 0.2 mm to 0.5 mm.

[0032] The number of insulated wires 2 in a multi-core cable 1 is not particularly limited, and the present invention can be applied to multi-core cables 1 having 3 or more insulated wires 2. In this embodiment, the number of insulated wires 2 contained in one multi-core cable 1 is, for example, between 10 and 300.

[0033] (Multi-core cable assembly)

[0034] Figure 2 This is a schematic diagram of a multi-core cable assembly. (For example...) Figure 2 As shown, the multi-core cable assembly 10 includes a multi-core cable 1 and circuit boards 11 respectively disposed at two ends of the multi-core cable 1.

[0035] The circuit board 11 is, for example, an internal board for a sensor section, a connector section, etc. Hereinafter, the circuit board 11 provided on one end of the multi-core cable 1 (left side of the figure) will be referred to as the first circuit board 11a, and the circuit board 11 provided on the other end of the multi-core cable 1 (right side of the figure) will be referred to as the second circuit board 11b.

[0036] On the first and second circuit boards 11a and 11b, a plurality of electrode patterns 12, which are connected to the insulated wires 2 of the multi-core cable 1, are arranged in a neat row. Hereinafter, the electrode pattern 12 provided on the first circuit board 11a is referred to as the first electrode pattern 12a, and the electrode pattern 12 provided on the second circuit board 11b is referred to as the second electrode pattern 12b. The first electrode pattern 12a and the second electrode pattern 12 are in a one-to-one correspondence, and the corresponding electrode patterns 12a and 12b are electrically connected to each other through any insulated wires 2.

[0037] (Manufacturing method of multi-core cable assembly)

[0038] Figure 3 A flowchart illustrating the steps of a method for manufacturing a multi-core cable assembly. Figure 3 As shown, when manufacturing the multi-core cable assembly 10, firstly, a neat arrangement process is performed in step S1. In the neat arrangement process, at both ends of the pre-fabricated multi-core cable 1, a specified length of sheath 4 and shielding layer 3 is removed from the ends, exposing the insulated wires 2, which are then neatly arranged on a plane. At this time, as... Figure 4As shown, the tangles of the insulated wires 2 are untangled using a comb-like clamp or similar tool, and the insulated wires 2 are arranged neatly on a plane (e.g., on an inspection table) in a manner that minimizes the crossing of the insulated wires 2 with each other (the manner with the lowest crossing coefficient described later). It should be noted that at this time, treatments such as exposing the internal conductors 21 from the ends of each insulated wire 2 (end stripping treatment) can also be performed.

[0039] Then, a corresponding inspection process is performed in step S2. In this process, the correspondence between the ends of the insulated wires 2 is checked. This is because, in a multi-core cable 1 with multiple insulated wires 2, it is difficult to ensure that the identification color of the outer sheath 24 is different for all the insulated wires 2. Furthermore, when the insulated wires 2 are twisted inside the multi-core cable 1, their positional relationship is not fixed. In this embodiment, the method for checking the correspondence between the ends of the insulated wires 2 in the corresponding inspection process is not particularly limited. For example, a method can be used where an inspection signal is input at one end of any insulated wire 2, and the voltage output from each insulated wire 2 is measured at the other end.

[0040] Then, the connection target determination process is performed in step S3. In this process, the electrode patterns 12 of the connection targets for each insulated wire 2 are determined at both ends of the multi-core cable 1. In this embodiment, the electrode patterns 12 of the connection targets for the insulated wires 2 are determined in such a way that the cross-coefficient between the insulated wires 2 at both ends of the multi-core cable 1 is minimized. Detailed information regarding the connection target determination process will be described below.

[0041] Then, a connection process is performed in step S4. In this connection process, each insulated wire 2 is connected to the electrode pattern 12 of the connection target determined in step S3 using solder or the like. Through the above operations, the following is obtained: Figure 2 Multi-core cable assembly 10.

[0042] (Connecting the target determination process)

[0043] Figure 5 This is a flowchart of the connection target determination process performed by a computer. In the multi-core cable assembly method of this embodiment, a computer is used to calculate the crossover coefficients of the insulated wires 2 when one end of each insulated wire 2 is connected to the first electrode pattern 12a of the first circuit board 11a and the other end of each insulated wire 2 is connected to the second electrode pattern 12b corresponding to the second circuit board 11b. Furthermore, the electrode pattern 12 representing the connection target of one end of each insulated wire 2 is changed, and the crossover coefficients are calculated by the computer, repeating the above operation. Additionally, the computer determines the electrode pattern 12 representing the connection target of the multi-core cable 1 in such a way that the maximum crossover coefficient, representing any larger crossover coefficient among the crossover coefficients of one end and the other end of the multi-core cable 1, decreases.

[0044] Therefore, for example, it is possible to suppress the increase of crossovers at either end of the multi-core cable and reduce the average crossover coefficient of both ends of the multi-core cable 1. As a result, it is possible to prevent the crossed portions of the insulated wire 2 from becoming stiff, difficult to bend, and prone to breakage, thereby reducing the risk of breakage of the insulated wire 2. It should be noted that, for example, although it is also possible to determine the connection target by reducing the crossover coefficient between one end and the other end, in this case, there is a concern that the crossover coefficient at either end may become large, making it difficult to sufficiently reduce the risk of breakage.

[0045] In this embodiment, the crossover coefficient k is used as the index for evaluating the crossover of the insulated wires 2. That is, in the multi-core cable assembly method of this embodiment, the electrode pattern 12 of the connection target of the multiple insulated wires 2 is determined by computer in such a way that the maximum crossover coefficient kx, which is either a larger crossover coefficient k on one end side or the other end side of the multi-core cable 1, is reduced. Hereinafter, detailed information on the steps of the connection target determination process and the method for calculating the crossover coefficient will be described. In addition, in the following description, the side connected to the first electrode pattern 12a of the first circuit board 11a is defined as one end, and the side connected to the second electrode pattern 12b of the second circuit board 11b is defined as the other end.

[0046] like Figure 5 As shown, firstly, in step S301, the variable h is set to an initial value of 0 (zero). Then, in step S302, the matrix U, representing the connection state between the insulated wire 2 at one end of the multi-core cable 1 and the electrode pattern 12 under the initial state (the state where the cross coefficient at one end of the multi-core cable 1 is the smallest), is input into the computer. Figure 3 The matrix S, obtained in step S2, representing the correspondence between one end and the other end of the insulated wire 2, is input into the computer. The matrix T, representing the correspondence between the first electrode pattern 12a connected to one end of the insulated wire 2 and the second electrode pattern 12b connected to the other end, is also input into the computer. Based on these matrices U, S, and T, the computer calculates the matrix V(=TUS), representing the connection state between the insulated wire 2 and the electrode pattern 12 at the other end of the multi-core cable 1. -1 ).

[0047] As an example, as shown in Figure 6(a), the case of using a multi-core cable 1 with three insulated wires 2, with both ends of the multi-core cable 1 connected to a circuit board 11 with three electrode patterns 12 will be explained. This will be achieved through... Figure 3In step S1, the neat arrangement process arranges the multiple insulated wires 2 in a neat arrangement on a plane, setting the arrangement order as wire number N and the arrangement order of the electrode patterns 12 as electrode number E. Wire number N and electrode number E are numbered in ascending order from one direction of arrangement to the other (from top to bottom in the diagram). Here, regarding the first and second wiring patterns 12a and 12b, wiring patterns with the same electrode number correspond to each other, and the ends of the insulated wires 2 with wire numbers N=1, 2, and 3 on one end of the multi-core cable 1 correspond to the ends of the insulated wires 2 with wire numbers N=3, 1, and 2 on the other end. It should be noted that the correspondence between the two ends of the insulated wires 2 is determined by… Figure 3 The corresponding inspection process in step S2 is used for inspection.

[0048] In the example of Figure 6(a), if the insulated wires 2 numbered 1 to 3 are connected to the first electrode pattern 12a numbered 1 to 3 at one end, the crossover coefficient is minimized. Electrode patterns 12 with the same electrode number E are connected to each other in a corresponding manner to determine the connection target of the insulated wires 2 at the other end.

[0049] In the example of Figure 6(a), the matrix U at one end of the multi-core cable 1 and the matrix V at the other end can be represented by [number 1]. It should be noted that in the example shown, the inverse matrix S of matrix S is... -1 And matrix T can be represented by [number 2].

[0050] [Number 1]

[0051]

[0052] [Number 2]

[0053]

[0054] Using matrices U and V, if the matrix for wire number N and the matrix for electrode number E are set to [number 3]...

[0055] [Number 3]

[0056]

[0057] Then by the following formula

[0058] E = U × N

[0059] E = V × N,

[0060] It is possible to know the connection status of the insulated wires 2 at one end and the other end of the multi-core cable 1 with the electrode pattern 12 (i.e., the correspondence between the wire number N and the electrode number E).

[0061] Then, in step S303, the maximum cross coefficient kx in the initial state is calculated. Hereinafter, the cross coefficient k at one end of the multi-core cable 1 is denoted as ka, and the cross coefficient k at the other end is denoted as kb. In step S303, the cross coefficient k(ka,kb) at both ends of the multi-core cable 1 is first calculated. The cross coefficient k can be obtained by adding |E-N| to all the insulated wires 2. That is, the cross coefficient k can be obtained by the following formula k=Σ(|E-N|). In the example of Figure 6(a), according to the following formula, the cross coefficient ka at one end is 0.

[0062] ka=|1-1|+|2-2|+|3-3|=0

[0063] Furthermore, according to the following formula, the cross coefficient kb at the other end is 4.

[0064] kb=|1-3|+|2-1|+|3-2|=4

[0065] Then, the larger of the calculated initial crossover coefficients ka and kb is stored as the maximum crossover coefficient kx. In the example of Figure 6(a), kx = kb = 4.

[0066] Then, in step S304, for km representing the minimum value of the maximum cross coefficient kx, kx is substituted as the initial value. Then, in step S305, h is added, and in step S306, 1 is substituted into variable i.

[0067] Then, in step S307, it is determined whether i+h is less than or equal to the number n of insulated wires 2. If the determination is yes in step S307, i+h is substituted into variable j in step S308, and the process proceeds to step S310. If the determination is no in step S307, i+h-n is substituted into variable j in step S309, and the process proceeds to step S310.

[0068] In step S310, the matrix U' obtained by swapping rows i and j of matrix U is calculated. That is, the matrix U' is calculated when the connection target of insulated wire 2 with wire number N1 and insulated wire 2 with wire number N1 and j is changed. Then, in step S311, the matrix V corresponding to matrix U' is calculated. Specifically, when i=1 and j=2 (h=1), as shown in Figure 6(b), at one end of the multi-core cable 1, the connection target of wire number 1 is changed to electrode number 2, and the connection target of wire number 2 is changed to electrode number 1. Correspondingly, at the other end of the multi-core cable 1, the connection target of wire number 3 is changed to electrode number 2, the connection target of wire number 1 is changed to electrode number 1, and the connection target of wire number 2 is changed to electrode number 3. Thus, matrices U' and V are as shown in [Figure 4].

[0069] [Number 4]

[0070]

[0071] Then, in step S312, the cross coefficients ka and kb in the states of matrices U' and V are calculated, and the maximum cross coefficient kx is calculated. In the case of Figure 6(b), according to the following formula, the cross coefficient ka is 2.

[0072] ka=|1-2|+|2-1|+|3-3|=2

[0073] Similarly, according to the following formula, the cross coefficient kb is 2.

[0074] kb=|1-1|+|2-3|+|3-2|=2

[0075] Therefore, the maximum crossover coefficient kx is kx = ka = kb = 2.

[0076] Then, in step S313, it is determined whether variable i is 1. If the determination is yes in step S313, in step S314, the current km (the minimum value of the maximum cross coefficient kx) is substituted into variable km1, and the process proceeds to step S315. If the determination is no in step S313 when variable km1 is used to calculate the rate of change of the maximum cross coefficient kx in step S321 (described later), step S314 is skipped, and the process proceeds to step S315.

[0077] In step S315, it is determined whether the maximum cross coefficient kx calculated in step S312 is smaller than the current km (the minimum value of the maximum cross coefficient kx). If the determination is yes in step S315, kx is substituted into km in step S316 to update the minimum value. At the same time, matrix U' is substituted into matrix U in step S317 to update the connection target. That is, the change of the connection target at one end is determined. In subsequent processing, the connection target is changed starting from the updated state. In the example of Figure 6(b), km = 4 and kx = 2, so km is updated to 2, and the change of the connection target is determined to be the state of Figure 6(b). Then, proceed to step S318. If the determination is no in step S315, the value of km and matrix U are not updated, and proceed to step S318. In this case, the change of the connection target (matrix U') in step S310 will not be reflected, forming a state that maintains the state before the change of the connection target in step S310.

[0078] In step S318, it is determined whether variable i is greater than or equal to the number n of insulated wires 2. If the determination is no in step S318, i is increased in step S319, and the process returns to step S307. In the loop after the second step S307, i = 2 and j = 3. In step S310, a matrix U' is formed by changing the second and third rows in the current matrix U. The connection state at this time is shown in Figure 6(c), and matrix U' and its corresponding matrix V are shown in [Figure 5].

[0079] [Number 5]

[0080]

[0081] At this point, the maximum cross coefficient kx obtained in step S312 is 4, which is above the current km=2, ​​so km and matrix U will no longer be updated.

[0082] Then, in the loop after the third step S307, i=3 and j=1, in step S310, a matrix U' is formed by changing the third row and the first row of the current matrix U. The connection state at this time is shown in Figure 6(c), and the matrix U' and its corresponding matrix V are shown in [Figure 6].

[0083] [Number 6]

[0084]

[0085] At this point, the maximum cross coefficient kx obtained in step S312 is 4, which is above the current km=2, ​​so km and matrix U will no longer be updated.

[0086] If the determination is yes in step S318, then in step S320, substitute the current km (the minimum value of the maximum cross coefficient kx) into the variable km2. Then, in step S321, calculate the rate of change dk of the maximum cross coefficient kx using the following formula.

[0087] dk=(km1-km2) / n

[0088] In step S322, it is determined whether the obtained rate of change dk is below the preset rate of change threshold kt. If the determination is negative in step S322, return to step S305, increase the variable h, and repeat steps S306 to S322. If the determination is positive in step S322, that is, when the rate of change dk is below the preset rate of change threshold kt, the connection target at this moment is determined as the electrode pattern 12 of the final connection target of the multiple insulated wires 2, and return (enter) Figure 3Step S4). It should be noted that steps S321 and S322 are ultimately steps to determine the convergence of the maximum cross coefficient kx. If the above calculation is repeated, it shows that the cross coefficient km converges to a certain value and no longer decreases above it. Therefore, if it is determined that the cross coefficient km has converged, the connection target at this moment (electrode pattern 12 with insulated wires 2 connected at both ends) is determined as the final connection target.

[0089] Thus, in this embodiment, the following steps are included: determining the maximum crossover coefficient kx when the electrode pattern 12 of the connection target of the insulated wire 2 with wire number N as i and the insulated wire 2 with wire number N as j (expressed by the following formula) is changed at one end of the multi-core cable 1.

[0090] j=i+h (when i+h≤n)

[0091] j = i + h - n (when i + h > n)

[0092] Where h: variable

[0093] n: The number of insulated wires 2

[0094] If the maximum cross coefficient kx is smaller than before the connection target change, the change of the connection target is determined, and the above operation (the loop of steps S307 to S318) is repeated in sequence; while increasing the variable h from 1 in sequence, the process is repeated to determine the electrode pattern 12 of the connection target of multiple insulated wires 2.

[0095] Furthermore, in this embodiment, when the rate of change dk of the maximum cross coefficient kx before and after the above-mentioned process (the loop of steps S307 to S318) is below the preset rate of change threshold kt, the connection target at this time is determined as the electrode pattern 12 of the connection target of multiple insulated wires 2.

[0096] (Verification of the effect of reducing the cross coefficient k)

[0097] As shown in Figure 7(a), a clamp 31 with multiple holes for the insulated wire 2 to pass through is used. The insulated wire 2 is passed through the holes of the clamp 31, forming a state in which the insulated wire 2 that has passed through the clamp 31 is fixed by a fixing clamp 32. Then, using a tension gauge 34 connected to the clamp 31 by a connecting wire 33, the clamp 30 is stretched at the base end side (sheath 4 side) with a load of 1 kg, and the crossing length, which is the distance from the end of the sheath 4 to the clamp 30, is measured. The number of insulated wires 2 is set to 128, and the crossing coefficient k is different to measure the crossing length. The measurement results are shown in Figure 7(b).

[0098] As shown in Figure 7(b), it is confirmed that the smaller the crossing coefficient k, the shorter the crossing length. The crossing of insulated wires 2 can be suppressed by reducing the crossing coefficient k. It should be noted that the correlation coefficient between the crossing coefficient k and the crossing length is 0.9.

[0099] (Comparison with random search)

[0100] As described above, this embodiment includes the following steps: First, after determining the maximum cross coefficient kx of the initial state where the cross coefficient k is minimized at one end of the multi-core cable 1, then determining the maximum cross coefficient kx when the electrode pattern 12 of the connection target of any insulated wire 2 differs from that of the insulated wire 2 only at the point where the wire number is variable h is changed at one end of the multi-core cable 1. If the maximum cross coefficient kx is smaller than before the connection target change, the change of the connection target is determined, and the above operation is repeated sequentially. By repeatedly increasing the variable h from 1, the electrode pattern 12 of the connection target of the multi-insulated wires 2 is determined. This allows for a reduction in the maximum cross coefficient kx with fewer search iterations. It should be noted that the number of search iterations is defined as the number of times the maximum cross coefficient kx has been determined.

[0101] However, this is not the only option. For example, one could randomly determine the connection target at one end, calculate the maximum cross coefficient kx, and repeat the above operation to determine the connection target of the insulated wire 2 in a way that yields a smaller maximum cross coefficient kx. This search method will be referred to as random search below.

[0102] For according to the passage Figure 5 The flowcharts for determining connection targets in Embodiment 1 and Embodiments 2-4, which determine connection targets through random search, are used to investigate the variation of the maximum crossover coefficient kx with respect to the number of searches. The number n of insulated wires 2 is set to 128. The results are shown in... Figure 8 .

[0103] like Figure 8 As shown, in Examples 2-4 using random search, even with an increase in the number of searches, the decrease in the maximum crossover coefficient kx is minimal, indicating that a very large number of searches are required to reduce the crossover of the insulated wires 2. However, in Example 1 according to this embodiment, the maximum crossover coefficient kx decreases sharply with an increase in the number of searches, demonstrating that the crossover of the insulated wires 2 can be reduced with fewer searches.

[0104] In addition, according to Figure 8It can also be seen that in Example 1, if the number of searches increases, the value of the maximum cross coefficient kx converges slowly, and the rate of change decreases. Therefore, it can be seen that when the rate of change dk of the maximum cross coefficient kx relative to the number of searches is below the preset rate of change threshold kt, by determining the connection target at this time as the electrode pattern 12 of the connection target of multiple insulated wires 2, useless searches can be eliminated, thereby reducing the crossover of the insulated wires 2 more efficiently.

[0105] (The role and effects of the implementation method)

[0106] As explained above, in the multi-core cable assembly method of this embodiment, multiple insulated wires 2 are neatly arranged on a plane at both ends of the multi-core cable 1. The cross-coefficients of the insulated wires 2 at one end of the multi-core cable 1 and the other end of the multi-core cable 1 are determined when one end of the multi-core cable 2 is connected to the electrode pattern 12 of a circuit board 11 and the other end of the multi-core cable 2 is connected to the electrode pattern 12 corresponding to another circuit board 11. Furthermore, the cross-coefficients are determined by changing the electrode pattern 12 of the connection target of one end of the multi-core cable 2. The above operation is repeated to determine the electrode pattern of the connection target of the multi-core cable 2 in such a way that the maximum cross-coefficient of any larger cross-coefficient among the cross-coefficients at one end of the multi-core cable 1 is reduced.

[0107] Therefore, while suppressing the increase in crossovers at either end of the multi-core cable 1, the crossover coefficients at both ends of the multi-core cable 1 can be reduced on an average basis. As a result, the crossover portions of the insulated wire 2 can be prevented from becoming stiff and difficult to bend, thus reducing the risk of breakage.

[0108] Furthermore, according to this embodiment, the crossover coefficient at both ends of the multi-core cable 1 can be reduced on average, thus enabling the manufacture of a multi-core cable assembly 10 with fewer crossovers at both ends of the multi-core cable 1 with good reproducibility, suppressing deviations in individual products, and stably manufacturing the multi-core cable assembly 10.

[0109] (Summary of implementation methods)

[0110] Next, the technical concept learned from the embodiments described above will be described by reference to the symbols and other references used in the embodiments. However, the symbols and other references used below are not intended to limit the constituent elements in the claims to the components specifically given in the embodiments.

[0111] [1] A method for assembling a multi-core cable, comprising connecting the multiple insulated wires (2) to electrode patterns (12) corresponding to circuit boards (11) at both ends of a multi-core cable (1) having multiple insulated wires (2) and a sheath (4) covering the multiple insulated wires (2), wherein the multiple insulated wires (2) are arranged neatly on a plane at both ends of the multi-core cable (1), and a computer is used to determine that one end of the multiple insulated wires (2) is connected to the electrode pattern (12) of one circuit board (11), and the other end of the multiple insulated wires (2) is connected to another circuit board (11). The aforementioned electrode pattern (12) corresponds to the cross coefficient of the aforementioned insulated wires on one end and the other end of the aforementioned multi-core cable (1). Furthermore, while changing the connection target of one end of the aforementioned multi-core cable (2), the connection target of the other end of the aforementioned multi-core cable (2) is changed accordingly. The aforementioned cross coefficient of one end and the other end of the aforementioned multi-core cable (1) is calculated by the aforementioned computer. The above operation is repeated so that the maximum cross coefficient of any larger cross coefficient among the cross coefficients of one end and the other end of the aforementioned multi-core cable (1) becomes smaller. The aforementioned electrode pattern (12) of the connection target of the aforementioned multi-core cable (2) is determined by the aforementioned computer.

[0112] [2] According to the assembly method of the multi-core cable described in [1], based on the wire number N, which is the arrangement order of the aforementioned multi-insulated wires (2) when they are arranged neatly on the plane, and the electrode number E, which is the arrangement order of the aforementioned electrode pattern (12), for all the aforementioned insulated wires (2), |E-N| are added together to obtain the cross coefficient of one end and the other end of the aforementioned multi-core cable (1), so that the maximum cross coefficient of any larger cross coefficient among the cross coefficients of one end and the other end of the aforementioned multi-core cable (1) is reduced, and the aforementioned electrode pattern (12) of the connection target of the aforementioned multi-insulated wires (2) is determined by the aforementioned computer.

[0113] [3] The assembly method of the multi-core cable according to [2] includes the following steps: after using the aforementioned computer to calculate the maximum cross coefficient of the initial state with the minimum cross coefficient at one end of the aforementioned multi-core cable (1), the aforementioned computer calculates the maximum cross coefficient when the connection target of the aforementioned insulated wire (2) with wire number N as i and the aforementioned insulated wire (2) with wire number N as j represented by the following formula is changed at one end of the aforementioned multi-core cable (1).

[0114] j=i+h (when i+h≤n)

[0115] j = i + h - n (when i + h > n)

[0116] Where h: variable

[0117] n: Number of insulated wires

[0118] If the maximum cross coefficient is smaller than before the connection target change, the change of the connection target is determined by the aforementioned computer, and the above operation is repeated in sequence; by increasing the variable h from 1 in sequence while repeating this process, the connection target of the aforementioned multiple insulated wires (2) is determined by the aforementioned computer.

[0119] [4] According to the assembly method of the multi-core cable described in [3], when the rate of change of the maximum cross coefficient before and after the aforementioned process is below the preset rate of change threshold, the aforementioned computer determines the connection target at this time as the connection target of the aforementioned multi-insulated wires (2).

[0120] [5] A method for manufacturing a multi-core cable assembly, comprising a multi-core cable assembly (10) having a multi-core cable (1) and a circuit board (11), wherein the multi-core cable (1) has multiple insulated wires (2) and a sheath (4) covering the multiple insulated wires (2), the circuit board (11) is respectively disposed at both ends of the multi-core cable (1) and has an electrode pattern (12) connected to the multiple insulated wires (2); the multiple insulated wires (2) are arranged neatly on a plane at both ends of the multi-core cable (1), and the electrode pattern (12) for connecting one end of the multiple insulated wires (2) to one of the circuit boards (11) is determined by the computer. When the other end is connected to the electrode pattern (12) corresponding to another circuit board (11), the cross coefficient of the insulated wire (2) on one end and the other end of the multi-core cable (1) is determined. The connection target of one end of the multi-core cable (2) is changed, and the connection target of the other end of the multi-core cable (2) is changed along with the change. The cross coefficient of one end and the other end of the multi-core cable (1) is calculated by the computer. The above operation is repeated so that the maximum cross coefficient of any larger cross coefficient among the cross coefficients of one end and the other end of the multi-core cable (1) becomes smaller. The electrode pattern (12) of the connection target of the multi-core cable (2) is determined by the computer.

[0121] The embodiments of the present invention have been described above, but the embodiments described above are not intended to limit the invention as defined in the claims. Furthermore, it should be noted that not all of the feature combinations described in the embodiments are necessary for the method to solve the inventive problem. Moreover, the present invention can be implemented with appropriate modifications without departing from its spirit.

Claims

1. A method for assembling a multi-core cable, comprising connecting the multiple insulated wires and a sheath covering the multiple insulated wires to electrode patterns corresponding to a circuit board at both ends of the multi-core cable. At both ends of the multi-core cable, the multiple insulated wires are arranged neatly on a plane. The computer calculates the cross-coefficients of the insulated wires on one end and the other end of the multi-core cable when one end of the multiple insulated wires is connected to the electrode pattern of one circuit board and the other end of the multiple insulated wires is connected to the corresponding electrode pattern of another circuit board. The following operation is repeated: the connection target of one end of the multiple insulated wires is changed, and simultaneously, the connection target of the other end of the multiple insulated wires is changed accordingly. The computer then calculates the cross-coefficients of the multi-core cable on one end and the other end in this case. The crossover coefficient is an index that evaluates the crossover between the insulated wires. Based on the wire number N, which represents the arrangement order of the multiple insulated wires in a neat planar arrangement, and the electrode number E, which represents the arrangement order of the electrode pattern, for all the insulated wires, |E-N| are added together to obtain the crossover coefficient between one end and the other end of the multi-core cable. The computer determines the electrode pattern of the connection target of the multiple insulated wires in a manner that reduces the maximum cross coefficient, wherein the maximum cross coefficient is the larger of the cross coefficients on one end and the other end of the multi-core cable.

2. The assembly method of the multi-core cable according to claim 1, comprising the following steps: After using the computer to calculate the maximum cross coefficient in the initial state where the cross coefficient at one end of the multi-core cable is minimized, The computer calculates the maximum cross-coefficient when the connection target of the insulated wire with wire number N1 is changed to that of the insulated wire with wire number Nj (expressed by the following formula) at one end of the multi-core cable. If the maximum cross-coefficient is smaller than that before the connection target change, the computer determines the change of connection target. The above operation is repeated sequentially. When j=i+h,i+h≤n When j = i + h - n, i + h > n in, h: variable n: The number of insulated wires; The process is repeated while increasing the variable h sequentially from 1, thereby using the computer to determine the connection target of the multiple insulated wires.

3. In the multi-core cable assembly method according to claim 2, when the rate of change of the maximum cross coefficient before and after the process is below a preset rate of change threshold, the computer determines the connection target at this time as the connection target of the multiple insulated wires.

4. A multi-core cable assembly manufactured by the multi-core cable assembly method of claim 1.

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