Layout design method of rigid-flex printed cable network with high integration level

Abstract

The invention relates to a layout design method of a high-integration rigid-flex printed cable network, the rigid-flex printed cable network comprises one or more rigid-flex printed cables, and each rigid-flex printed cable is composed of an electric connector, a rigid-flex printed board and a solid sealing adhesive; wherein the rigid-flex printed board is composed of a rigid board and a multi-layer flexible board; according to the working principle, the electric connector is welded to the rigid board part of the rigid-flex printed board, and the fixing and sealing glue acts on a welding spot; the electric connector is used for connecting each device, is inserted, locked and fixed with a connector of each device, and is used for reliably transmitting an electric signal; the rigid-flex printed board realizes long-distance flexible transmission of electric signals, the rigid board is used for being reliably welded with the electric connector, and the multi-layer flexible board is used for long-distance flexible signal transmission and is convenient to bend; and the sealing glue is used for protecting welding spots, improving the insulation performance of the product and improving the mechanical resistance of the rigid-flex printed cable. The function of the rigid-flex printed cable network is electric signal transmission, and 5000g impact can be realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of rigid-flex printed cables, and particularly relates to a layout design method for a highly integrated rigid-flex printed cable network. Background Art

[0002] A cable is a channel for electrical signal transmission. In traditional cable design, connectors and wires are connected together by crimping or soldering. However, due to its heavy weight, it is difficult to assemble manually. At present, the solution is to use rigid-flex printed cables instead of traditional cables for signal transmission. The present invention aims to propose a layout design method for a highly integrated rigid-flex printed cable network.

[0003] Through the retrieval of public patent documents, no public invention patent documents related to the application of the present invention have been found. Summary of the Invention

[0004] The present invention aims to provide a layout design method for a highly integrated rigid-flex printed cable network to achieve an efficient structural design of the rigid-flex printed cable network.

[0005] A layout design method for a highly integrated rigid-flex printed cable network, where the rigid-flex printed cable network includes one or more rigid-flex printed cables, and each rigid-flex printed cable is composed of an electrical connector, a rigid-flex printed board, and a potting adhesive; wherein the rigid-flex printed board is composed of a rigid board and multiple flexible boards; the working principle is that the electrical connector is soldered to the rigid board part of the rigid-flex printed board, and the potting adhesive acts on the solder joints; the electrical connector is used to connect each device, and is inserted and locked with the connectors of each device for reliable transmission of electrical signals; the rigid-flex printed board realizes long-distance flexible transmission of electrical signals, where the rigid board is used for reliable soldering with the electrical connector, and the multiple flexible boards are used for long-distance flexible signal transmission and are easy to bend; the potting adhesive is used to protect the solder joints to improve the insulation performance of the product and enhance the mechanical properties of the rigid-flex printed cable; its characteristics lie in that the design method is carried out according to the following specific steps:

[0006] Step 1: Plan a three-dimensional space path in combination with the electrical connection relationships of each device, and let the multiple flexible boards adhere to the outer surface of the device to reduce the path length of the multiple flexible boards; determine the position and size of the multiple flexible boards; the length of the multiple flexible board part is determined according to the relative relationships of the electrical connectors of each device to be connected by this cable; specifically, the following principles are followed:

[0007] (1) The principle of the minimum path, so as to ensure that when the three-dimensional space path is unfolded into a two-dimensional plane, the outer contour size is the smallest;

[0008] (2) The principle of avoiding high-temperature or heat-generating devices, so that the multiple flexible boards avoid heat-generating devices;

[0009] (3) Conduct structural wiring design by grouping and classifying the wiring, that is, plan two main wiring tracks, which not only ensure the smooth wiring of the wire harness but also facilitate installation and fixation;

[0010] (4) Design the width of the multi-layer flexible board in combination with the electrical characteristics of the transmitted electrical signals, with the criterion of meeting the transmission of large-current signals;

[0011] (5) Conduct anti-tearing mechanical strengthening design for the multi-layer flexible board with rounded corners;

[0012] Step 2: Select the type of electrical connector according to the space between the device and the cabin; The selection of electrical connectors includes series selection, core number selection, plug-in form selection, locking accessory selection, pin length selection, and grade selection;

[0013] Step 3: Design the position and size of the rigid part for welding each connector; Follow the following principles:

[0014] (1) Consider the relative positions and spatial positions of each connector of the existing device. First, ensure that there is no interference with the positions of other devices and electrical connectors, and have good assemblability;

[0015] (2) To better achieve the electrical transmission of large currents and electrical wiring design, it should be ensured that the length-width ratio of the rigid board is 3 mm to 5 mm longer than the length and width of the envelope outer contour of the electrical connector;

[0016] (3) The thickness design of the rigid board is related to the type and quantity of electrical signal transmission of the printed circuit board. The thickness design of the rigid board is based on the criterion that the electrical signal transmission meets the transmission of large-current signals;

[0017] Step 4: Determine the fixing method of the rigid-flex printed circuit board to the cabin; Determine the welding direction of the electrical connector according to the electrical connection relationship and the type of pin and jack of the electrical connector, so as to facilitate the PCB wiring design; Follow the following principles:

[0018] (1) For the fixation of long rigid-flex printed cables, use the cable tie method for fixation, wrap tape at the cable tie position for protection, or use the clamp method for fixation, wrap tape at the cable tie position for protection;

[0019] (2) If the electrical connection relationship is a 1-to-1 design, and one end of the rigid-flex printed cable is a pin and the other end is a jack, the welding directions of the electrical connectors at both ends should be the same up and down; If the electrical connection relationship is a 1-to-1 design, and both ends of the rigid-flex printed cable are pins or jacks, the welding directions of the electrical connectors at both ends should be one up and one down;

[0020] Step 5: Design to achieve overall optimization, improve the chamfer, and have clear markings in details, and complete the assembly.

[0021] The width of the multi-layer flexible board is 10 mm to 20 mm, and the multi-layer flexible board can withstand a current-carrying capacity of more than 10 A to ensure that the electrical wiring design meets the requirements.

[0022] The length-width ratio of the multi-layer flexible board is such that the length and width of the envelope outer contour of the electrical connector are each 3 mm to 5 mm to better achieve the electrical transmission of large currents and the electrical wiring design.

[0023] The thickness design range of the rigid board is 1.2 mm to 3.2 mm. The type and quantity of the electrical signal transmission of the thickness printed board are related, but to ensure solderability, the thickness should not exceed 3.2 mm.

[0024] The clamp method is used for fixing longer rigid-flex printed cable bundles; for shorter rigid-flex printed cable bundles laid on equipment, the method of winding with low outgassing tape is used to fix them to the equipment to ensure that the product can withstand a certain mechanical environment.

[0025] The connector code is marked on both the front and back near the rigid board and the multi-layer flexible board; near the multi-layer flexible board, the name, drawing number, serial number, etc. of the rigid-flex printed cable are marked at regular intervals to ensure convenient assembly.

[0026] Advantages of the present invention:

[0027] The present invention is composed of multiple rigid-flex printed cables. Each rigid-flex printed cable is composed of a connector and a rigid-flex printed board, and the rigid-flex printed board is composed of two parts: a rigid board and a multi-layer flexible board. The working principle is that the electrical connector is welded to the rigid board of the rigid-flex printed board, and the potting adhesive acts on the solder joints. The electrical connector is used to connect various devices, and is inserted and locked with the connectors of various devices for reliable transmission of electrical signals; the rigid-flex printed board realizes the long-distance flexible transmission of electrical signals, where the rigid board is used for reliable welding with the electrical connector, and the multi-layer flexible board is used for long-distance flexible signal transmission and is convenient for bending; the potting adhesive is used to protect the solder joints, improve the insulation performance of the product, and improve the mechanical performance resistance of the rigid-flex printed cable. The function of the rigid-flex printed cable network is electrical signal transmission and can achieve an impact of 5000 g. Description of the drawings

[0028] Figure 1 are the flowcharts of the layout design method of the rigid-flex printed cable network of the present invention;

[0029] Figure 2 are the three-dimensional assembly diagrams of a rigid-flex printed cable network in an example of the present invention;

[0030] Figure 3 are the three-dimensional diagrams of a rigid-flex printed cable in an example of the present invention;

[0031] Figure 4 are the specific implementation manners of the three-dimensional diagram of the clamp in an example of the present invention. Detailed implementation mode

[0032] The present invention is achieved through the following technical solutions.

[0033] A layout design method for a highly integrated rigid-flex printed cable network, characterized in that it is carried out according to the following specific steps:

[0034] Step 1: Plan the cable laying path in combination with the electrical connection relationships of each device, and determine the position and size of the flexible part;

[0035] Step 2: Select the type of electrical connector according to the space between the device and the cabin;

[0036] Step 3: Design the position and size of the rigid part for welding each connector;

[0037] Step 4: Determine the fixing method of the rigid-flex printed board to the cabin; determine the welding direction of the electrical connector according to the point position relationship;

[0038] Step 5: Overall optimize and improve details such as chamfers and markings to complete the assembly.

[0039] Furthermore, for the layout design method of a highly integrated rigid-flex printed cable network described in claim 1, it is characterized in that:

[0040] The wiring design of the multi-group and classified wiring structure of multiple rigid-flex printed cables is planned into two main wiring tracks, which not only ensures the smooth wiring of the wire harness but also facilitates installation and fixation.

[0041] Furthermore, for the layout design method of a highly integrated rigid-flex printed cable network described in claim 1, it is characterized in that:

[0042] The width of the multi-layer flexible board is 10 mm to 20 mm, and the current-carrying capacity of the flexible part is greater than 10 A to ensure that the electrical wiring design meets the requirements.

[0043] Furthermore, for the layout design method of a highly integrated rigid-flex printed cable network described in claim 1, it is characterized in that:

[0044] When designing the multi-layer flexible board, a sufficient turning radius is reserved, which is 10 times the thickness of the multi-layer flexible board, to ensure an appropriate reserved length during assembly.

[0045] Furthermore, for the layout design method of a highly integrated rigid-flex printed cable network described in claim 1, it is characterized in that:

[0046] The electrical connector is selected as a straight plug and a bent plug printed board type connector, and the electrical connector locking part is selected as a free end locking part.

[0047] Furthermore, for the layout design method of a highly integrated rigid-flex printed cable network described in claim 1, it is characterized in that:

[0048] The length and width of the envelope outer contour of the rigid board's aspect ratio electrical connector are each 3 mm to 5 mm, to ensure better implementation of large-current electrical transmission and electrical wiring design.

[0049] Furthermore, for the high-integration rigid-flex printed cable network layout design method described in requirement 1, it is characterized in that:

[0050] The thickness design range of the rigid board is 1.2 mm to 3.2 mm. The type and quantity of the electrical signal transmission of the thickness printed board are related, but to ensure solderability, the thickness should not exceed 3.2 mm.

[0051] Furthermore, for the high-integration rigid-flex printed cable network layout design method described in requirement 1, it is characterized in that:

[0052] The clamp method is adopted for the fixation of longer rigid-flex printed cable bundles; for the rigid-flex printed cable bundles laid on the equipment with shorter dimensions, the method of winding with low-outgassing tape is used to fix with the equipment to ensure that the product can withstand a certain mechanical environment.

[0053] Furthermore, for the high-integration rigid-flex printed cable network layout design method described in requirement 1, it is characterized in that:

[0054] The connector code is marked on the flexible board near the rigid board part, both on the front and back; on the flexible printed board, the name, drawing number, serial number, etc. of the rigid-flex printed cable are marked at regular intervals to ensure convenient assembly.

[0055] The present invention will be described in detail below in conjunction with specific embodiments.

[0056] The process of the rigid-flex printed cable network layout design method of the present invention is as shown in the appendix Figure 1 shown. An embodiment of the present invention provides a high-integration rigid-flex printed cable network layout design, as shown in the appendix Figure 2 shown, including: 12 rigid-flex printed cables, each rigid-flex printed cable includes an electrical connector and a rigid-flex printed board, and the rigid-flex printed board is composed of two parts: a rigid printed board and a flexible printed board.

[0057] Specifically, the three-dimensional diagram of a certain rigid-flex printed cable is as shown in the appendix Figure 3 shown.

[0058] In a specific example, the rigid-flex printed cable network layout is planned into two groups in the +Z direction and -Z direction.

[0059] In a specific example, the width of the multi-layer flexible board is 18 mm, and the current-carrying capacity of the flexible board part is greater than 18 A, meeting the requirements of electrical wiring design.

[0060] In a specific example, the designed bending radius of the multi-layer flexible board is 20 mm, ensuring appropriate reserved length and bending performance during assembly.

[0061] In a specific example, the electrical connector is selected as the straight and bent plug printed circuit board type connector of the MDM1 series. The pitch of the electrical connector is 1 mm, the length of the pin is 2.8 mm, the center distance between two rows of pins is 0.866 mm, and the locking part of the electrical connector is the L locking part.

[0062] In a specific example, the length-width ratio of the rigid board is 5 mm in both length and width of the envelope outer contour of the electrical connector, ensuring better realization of large-current electrical transmission and electrical wiring design.

[0063] In a specific example, the designed thickness range of the rigid board is 2.0 mm, ensuring the solderability of the product.

[0064] In a specific example, a convex clamp is used for fixing the longer rigid-flex printed cable bundle. See the attached three-dimensional drawing of the clamp Figure 4 ; For the rigid-flex printed cable bundle laid on the equipment with shorter dimensions, a low outgassing tape winding method is used to fix it to the equipment to ensure that the product can withstand a certain mechanical environment.

[0065] In a specific example, the connector code is marked on the flexible board near the rigid board part, such as X11, and it is marked on both the front and back; on the flexible printed board, the name, drawing number, number, etc. of the rigid-flex printed cable are marked every 200 mm to ensure convenient assembly.

[0066] The above description is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention all fall within the scope of the technical solution of the present invention.

Claims

1. A highly integrated rigid-flexible printed cable network layout design method, the rigid-flexible printed cable network includes one or more rigid-flexible printed cables, each rigid-flexible printed cable consists of an electrical connector, a rigid-flexible printed board, and a sealing adhesive; wherein the rigid-flexible printed board consists of a rigid board and a multi-layer flexible board; the working principle is that the electrical connector is welded to the rigid board part of the rigid-flexible printed board, and the sealing adhesive acts on the solder joint; the electrical connector is used to connect various devices, and is locked and fixed with the connector of each device for reliable transmission of electrical signals; the rigid-flexible printed board realizes long-distance flexible transmission of electrical signals, wherein the rigid board is used for reliable welding with the electrical connector, and the multi-layer flexible board is used for long-distance flexible signal transmission, which is easy to bend; the sealing adhesive is used to protect the solder joint to improve the insulation performance of the product and improve the mechanical resistance of the rigid-flexible printed cable; it is characterized in that The design method is carried out according to the following specific steps: Step 1: Plan the three-dimensional space path in combination with the electrical connection relationship of each device, and attach the multi-layer flexible board to the outer surface of the device to reduce the path length of the multi-layer flexible board; determine the position and size of the multi-layer flexible board; the length of the multi-layer flexible board part is determined according to the relative relationship of the electrical connectors of each device to be connected by this cable; specifically, follow the following principles: (1) The minimum path principle ensures that the outer contour size is minimized when the three-dimensional space path is unfolded into a two-dimensional plane; (2) Avoid high temperature or heating devices, so that the multi-layer flexible board can avoid heating devices; (3) Structural wiring design is performed by grouping and classifying the wiring, that is, planning two main wiring tracks to ensure smooth wiring of the wiring harness and facilitate installation and fixation; (4) The width of the multi-layer flexible board is designed in combination with the electrical characteristics of the transmitted electrical signal to meet the criteria for high current signal transmission; (5) Multi-layer flexible plate with inverted arc tear-proof mechanical reinforcement design; Step 2: Select the type of electrical connector according to the space between the equipment and the cabin; the selection of electrical connectors includes series selection, number of cores selection, plug-in form selection, locking accessories selection, pin length selection, and grade selection; Step 3: Design the position and size of the rigid parts for welding of each connector; Follow these principles: (1) Consider the relative position and spatial position of each connector of the existing equipment, first ensure that there is no interference with the position of other equipment and electrical connectors, and have good assembly performance; (2) In order to better realize the electrical transmission of large current and electrical wiring design, the length and width of the rigid board should be 3mm to 5mm longer than the outer contour of the envelope of the electrical connector; (3) The thickness design of the rigid board is related to the type and quantity of electrical signal transmission of the printed board. The thickness design of the rigid board is based on the principle that the electrical signal transmission meets the requirements of high current signal transmission; Step 4: Determine the fixing method of the rigid-flex printed circuit board and the cabin; determine the welding direction of the electrical connector according to the electrical connection relationship and the type of electrical connector pins and sockets to facilitate PCB wiring design; Follow these principles: (1) For the fixing of long rigid-flex printed cables, use cable ties to fix them and wrap tape around the cable ties for protection, or use clamps to fix them and wrap tape around the cable ties for protection; (2) If the electrical connection relationship is a 1-to-1 design, and one end of the rigid-flex printed cable is a pin and the other end is a socket, the welding direction of the electrical connectors at both ends should be the same up and down; if the electrical connection relationship is a 1-to-1 design, and both ends of the rigid-flex printed cable are pins or sockets, the welding direction of the electrical connectors at both ends should be one up and one down; Step 5: Design to achieve overall optimization, perfect chamfers, clearly mark details, and complete assembly.

2. A highly integrated rigid-flex printed cable network layout design method according to claim 1, characterized in that: The width of the multi-layer flexible board is 10mm-20mm, and the current carrying capacity of the multi-layer flexible board is greater than 10A, so as to ensure that the electrical wiring design meets the requirements.

3. A highly integrated rigid-flex printed cable network layout design method according to claim 1, characterized in that: The length and width of the multi-layer flexible board are 3mm to 5mm longer than the outer contour of the envelope of the electrical connector, so as to ensure better realization of large current electrical transmission and electrical wiring design.

4. A highly integrated rigid-flex printed cable network layout design method according to claim 1, characterized in that: The thickness design range of rigid boards is 1.2mm to 3.2mm. The thickness is related to the type and quantity of electrical signal transmission on the printed board. However, to ensure solderability, the thickness should not exceed 3.2mm.

5. A highly integrated rigid-flex printed cable network layout design method according to claim 1, characterized in that: The clamp method is used to fix longer rigid-flex printed cable bundles; for shorter rigid-flex printed cable bundles laid on the equipment, low-outgassing tape is used to wrap them and fix them to the equipment to ensure that the product can withstand a certain mechanical environment.

6. A highly integrated rigid-flex printed cable network layout design method according to claim 1, characterized in that: The connector code is marked on both the front and back sides near the rigid board and the multi-layer flexible board; the name, drawing number, serial number, etc. of the rigid-flex printed cable are marked at certain intervals near the multi-layer flexible board to ensure easy assembly.

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