Flexible printed board cable based on bestriding type connector

Abstract

The invention relates to a flexible printed board cable based on a straddle type connector, which comprises an electric connector (1), a flexible printed board (3) and a potting colloid (2), and is characterized in that the electric connector (1) is the straddle type connector, and the straddle type connector is directly welded on a reserved bonding pad (31) of the flexible printed board (3) through a contact piece (11); and then the welding part is embedded through the embedding colloid (2) to be fixed and reinforced. According to the flexible printed board cable and the straddle type connector connected with the flexible printed board cable, direct connection between the electric connector and the flexible printed board is achieved, a rigid printed board is omitted, and the manufacturing cost of the printed board is greatly reduced.

Description

Technical Field

[0001] The invention relates to a flexible printed board cable based on a straddle-type connector, which is particularly suitable for interconnection of electrical signals in a narrow space and belongs to the technical field of printed boards. Background Art

[0002] Cables are an indispensable part of aircraft as channels for transmitting electrical signals between devices. As the size and weight of aircraft continue to decrease and the integration continues to increase, the disadvantages of traditional wire cables, such as heavy weight and thick wire diameter, have gradually become apparent. On some aircraft, traditional wire cables can no longer be used for signal transmission between devices. Therefore, with the characteristics of being light, thin, and flexible, flexible printed circuit cables have begun to be used in aircraft. Traditional flexible printed circuit cables are mostly rigid-flexible printed circuit board solutions, that is, the main body of the cable is a flexible printed circuit board, the connector welding point is a rigid printed circuit board, and the cable printed circuit board as a whole is a rigid-flexible printed circuit board. The implementation cost of this solution is relatively high. In order to reduce the cost, the present invention designs a flexible printed circuit cable based on a straddle-type connector, which can realize the direct welding of the straddle-type connector with the flexible printed circuit board, and the cable printed circuit board as a whole is a pure flexible printed circuit board, which greatly reduces the implementation cost. Summary of the invention

[0003] The purpose of the present invention is to design a flexible printed circuit cable based on a straddle-type connector, which is suitable for electrical interconnection in a small space on an aircraft and has a low cost.

[0004] A flexible printed circuit cable based on a straddle-type connector comprises an electrical connector 1, a flexible printed circuit board 3 and a potting colloid 2, wherein the electrical connector 1 is a straddle-type connector, the straddle-type connector is directly welded to a pad 31 reserved on the flexible printed circuit board 3 through its contact piece 11, and then the welding position is potted with the potting colloid 2 for fixation and reinforcement.

[0005] The spacing, size and position of the pads 31 are designed according to the straddle type connector, so that the contact pieces 11 of the straddle type connector are surface mounted and welded to the pads 31 and are tightly connected together.

[0006] The straddle-type electrical connector is a double-row welding type electrical connector, and the contact members 11 on the straddle-type electrical connector are welding pins.

[0007] The flexible printed circuit board 3 adopts FPC technology, including a solder pad 31, a covering film 32, and a flexible copper clad board 33, wherein the flexible copper clad board 33 includes a signal copper layer 331 and a flexible PI board 332. Positions for the solder pads 31 are reserved on the upper and lower surfaces and the left and right ends of the flexible printed circuit board 3.

[0008] The potting glue 2 forms a potting glue block with a set thickness at the soldering pad 31 and the soldering needle position.

[0009] The copper layer 331 of the flexible copper clad laminate 33 is made of rolled copper foil metal wiring.

[0010] Beneficial effects of the present invention:

[0011] (1) The flexible printed circuit cable of the present invention replaces the traditional wire cable and has the characteristics of being light, thin and flexible, and is suitable for use in a narrow space.

[0012] (2) The flexible printed circuit cable of the present invention and the straddle-type connector connected thereto realize direct connection between the electrical connector and the flexible printed circuit. The present invention eliminates the need for a rigid printed circuit, thereby greatly reducing the manufacturing cost of the printed circuit board.

[0013] (3) The flexible printed circuit cable of the present invention realizes reliable fixation of the welding point between the electrical connector and the flexible printed circuit, and ensures the overall mechanical properties of the cable through a special potting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 , is a schematic diagram of a three-dimensional model of the present invention;

[0015] Figure 2 , is a three-dimensional schematic diagram of the straddle-type electrical connector of the present invention;

[0016] Figure 3 , is a schematic diagram of the structure of the flexible printed circuit board of the present invention;

[0017] Figure 4 , is a schematic diagram of the welding position of the straddle type connector of the present invention;

[0018] Figure 5 , is a schematic diagram of the potting treatment at the connection between the straddle type connector and the flexible printed circuit board of the present invention.

[0019] Among them, 1 is an electrical connector; 2 is a potting colloid; 3 is a flexible printed circuit board; 11 is a contact piece; 31 is a solder pad; 32 is a covering film; 33 is a flexible copper clad board; 331 is a copper layer; and 332 is a flexible PI board. DETAILED DESCRIPTION

[0020] The scheme of the present invention is as follows:

[0021] The flexible printed circuit cable based on the straddle-type connector is composed of three parts: the electrical connector, the flexible printed circuit board, and the potting colloid. The electrical connector is directly welded to the reserved pad of the flexible printed circuit board through the contact piece, and then the potting colloid is used to fix and strengthen the welding point.

[0022] The electrical connector uses the MDM1 series straddle-type connector from Shaanxi Huada Company, with a contact spacing of 1mm and a contact rated current of 2A.

[0023] The flexible printed circuit board is a multi-layer printed circuit board. Different routing methods are selected inside the printed circuit board according to the different signal types. The upper and lower outermost layers of the printed circuit board are designed as the ground layer to achieve cable shielding. The flexible printed circuit board uses a flexible copper-clad laminate as the base material, which has the characteristic of being bendable. Pads are provided at both ends of the flexible printed circuit board for welding power supply connector contacts, and the spacing, size, and position of the pads are carefully designed according to the electrical connector.

[0024] The product potting colloid uses EC104 epoxy glue, which has good chemical stability, corrosion resistance, heat resistance and sealing, as well as good adhesion and mechanical resistance. The amount of potting glue, length, width and height after curing are carefully designed according to the welding position to protect the welding point from external forces to the maximum extent.

[0025] Example:

[0026] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0027] One embodiment of the present invention provides a flexible printed circuit cable based on a straddle type connector, as shown in the attached Figure 1 As shown, it includes: an electrical connector, a flexible printed circuit board, and a potting colloid. The flexible printed circuit board cable is to directly weld the electrical connector on the flexible printed circuit board, and the potting colloid is used to fix and strengthen the welding point.

[0028] Specifically, the electrical connector uses a straddle-type electrical connector, whose contact piece can be directly surface-mounted and soldered on a PCB pad. The three-dimensional diagram of the straddle-type electrical connector is shown in the attached figure. Figure 2 shown.

[0029] In a specific example, the straddle-type electrical connector is a double-row welding type electrical connector.

[0030] In a specific example, the electrical connector is a MDM1-31PNP4 straddle-type electrical connector.

[0031] In a specific example, the electrical connector point spacing is 1 mm, the pin length is 2.8 mm, the center distance between two rows of pins is 0.866 mm, and the pin diameter is 0.35 mm.

[0032] In a specific example, the rated current of a single contact of the electrical connector is 2A.

[0033] Specifically, the flexible printed circuit board adopts FPC technology and is composed of pads, cover film, and flexible copper clad board, wherein the flexible copper clad board includes a signal copper layer and a flexible PI board. Connector pads are reserved on the upper and lower surfaces and left and right ends of the printed circuit board, as shown in the attached figure. Figure 3 shown.

[0034] In a specific example, a flexible copper clad laminate W-2010ED-N4 material substrate is selected.

[0035] In one specific example, rolled copper foil metal traces are selected.

[0036] In a specific example, the metal trace is designed to be 0.254 mm wide and have a resistivity of 1.72×10 -8 Ω / m, can reliably pass 0.3A current.

[0037] In a specific example, the flexible printed circuit board is a 4-layer circuit board, the upper and lower layers are ground layers, and the middle two layers are signal layers. The upper and lower ground layers realize the shielding design of the cable.

[0038] In a specific example, the thickness of the flexible printed circuit board in the pad area at both ends is 0.45 mm, which is 0.066 mm shorter than the center distance between two rows of pins of the electrical connector, thereby ensuring welding reliability.

[0039] Specifically, connector pads are designed at both ends of the flexible printed circuit board. The pads are rectangular surface mount pads. The schematic diagram of the pads after the electrical connector is welded is shown in the attached figure. Figure 4 shown.

[0040] In a specific example, there is a non-shielded area with a width of 2 mm at the pads at both ends of the flexible printed circuit board, that is, this area is a two-layer board with only two middle signal layers.

[0041] In a specific example, to match the MDM1-31PNP4 type straddle-type electrical connector, the pad size is 3.1×0.6mm. The pad size is 0.3mm longer and 0.25mm wider than the electrical connector contact to ensure the welding strength of the product.

[0042] In a specific example, the pad spacing is 0.35 mm, ensuring a 100V electrical strength.

[0043] In a specific example, the 1-point pad is located 0.8 mm from the upper edge of the flexible printed circuit board to ensure assemblability.

[0044] Specifically, the connection between the connector and the flexible printed circuit board is potted to form a local potting block, which effectively ensures the structural strength of the connection. The potting process diagram of the connection is shown in the attached figure. Figure 5 shown.

[0045] In a specific example, EC104 epoxy glue is selected as the potting glue.

[0046] In one specific example, the local potting block is in the form of a cubic structure.

[0047] In a specific example, the width of the local potting block is 17.4 mm, which is 0.2 mm wider than the printed circuit board and 0.2 mm shorter than the spacing of the connector mounting accessories, ensuring that there is no interference with the connector mounting accessories and that the potting is stable and reliable.

[0048] In a specific example, the length of the local potting block is 3.3 mm, which is 0.2 mm longer than the pad area size, protecting the root position of the solder joint.

[0049] In a specific example, the height of the local potting block is 3.6 mm, which is flush with the width of the connector flange, ensuring that there is no interference with other positions during installation.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A flexible printed circuit cable based on a straddle-type connector, comprising an electrical connector (1), a flexible printed circuit (3) and a potting colloid (2), characterized in that: The electrical connector (1) is a straddle-type connector, which is directly welded to a reserved pad (31) of a flexible printed circuit board (3) through its contact piece (11), and then the weld is encapsulated with an encapsulating colloid (2) to fix and strengthen it.

2. A flexible printed circuit cable based on a straddle type connector according to claim 1, characterized in that: The spacing, size and position of the pads (31) are designed according to the straddle type connector, so that the contact pieces (11) of the straddle type connector are surface mounted and welded to the pads (31) and are tightly connected together.

3. A flexible printed circuit cable based on a straddle type connector according to claim 1, characterized in that: The straddle-type electrical connector is a double-row welding type electrical connector, and the contact piece (11) on the straddle-type electrical connector is a welding pin.

4. A flexible printed circuit cable based on a straddle type connector according to claim 1, characterized in that: The flexible printed circuit board (3) adopts FPC technology and comprises a solder pad (31), a covering film (32), and a flexible copper-clad board (33), wherein the flexible copper-clad board (33) comprises a signal copper layer (331) and a flexible PI board (332), and positions for the solder pads (31) are reserved on the upper and lower surfaces and the left and right ends of the flexible printed circuit board (3).

5. A flexible printed circuit cable based on a straddle type connector according to claim 3, characterized in that: The potting glue (2) forms a potting glue block with a set thickness at the soldering pad (31) and soldering needle positions.

6. A flexible printed circuit cable based on a straddle type connector according to claim 4, characterized in that: The copper layer (331) of the flexible copper-clad laminate (33) is made of rolled copper foil metal wiring.

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