A high-density interconnection rigid-flex printed circuit board

Abstract

The utility model discloses a kind of soft and hard combination circuit board of high-density interconnection, including soft circuit board and two groups of hard circuit board, the both ends of the soft circuit board are fixedly connected with two groups of hard circuit board by pressing structure, and the hard circuit board between two groups is provided with the soft support sheet that can support soft circuit board, and the soft support sheet is fixed in the one end of hard circuit board by fixed structure;The utility model is by setting and arranging several groups of soft support sheet between two groups of hard circuit board, and designing limiting structure in the outermost soft support sheet side wall, can form transverse isolation and longitudinal limit to soft circuit board: soft support sheet can be adjacent soft circuit board physical separation;The bending structure of extension piece can be stuck to the both sides of soft circuit board, limit the deviation amplitude of soft circuit board in bending process, reduce the influence of possible signal interference between lines;Soft circuit board is clear in hierarchy, not easy to block assembly position, facilitate to reduce assembly difficulty.

Description

Technical Field

[0001] This utility model relates to the field of circuit board manufacturing technology, specifically to a high-density interconnected rigid-flex circuit board. Background Technology

[0002] A high-density interconnect rigid-flex PCB is a composite circuit board that combines high-density interconnect technology and rigid-flex PCB technology. This circuit board typically consists of rigid and flexible sections. The rigid sections support and fix components, ensuring circuit stability, while the flexible sections allow for bending and stretching to adapt to complex spatial layouts.

[0003] In traditional rigid-flex circuit boards, flexible circuit boards and rigid circuit boards are connected by lamination. When multiple circuit boards need to be staggered inside the equipment to improve space utilization, adjacent flexible circuit boards are prone to surface contact during bending or assembly, which may cause signal interference between circuits, affecting equipment performance and increasing assembly difficulty. Utility Model Content

[0004] The purpose of this invention is to provide a high-density interconnected rigid-flex circuit board. By setting up a flexible support sheet, the flexible circuit board is supported. The flexible support sheet can be twisted and deformed with the direction of the flexible circuit board without affecting the layout of the flexible circuit board. At the same time, it can prevent adjacent flexible circuit boards from touching each other due to gravity, enhance the structural stability of the junction between the flexible circuit board and the rigid circuit board, and improve the connection stability of the rigid-flex circuit board.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-density interconnected rigid-flex circuit board, comprising a flexible circuit board and two sets of rigid circuit boards, wherein the two ends of the flexible circuit board are fixedly connected to the two sets of rigid circuit boards through a pressing structure, and a flexible support sheet capable of supporting the flexible circuit board is provided between the two sets of rigid circuit boards, wherein the flexible support sheet is fixed to one end of the rigid circuit board through a fixing structure.

[0006] Preferably, the soft support sheets are arranged in several groups side by side, and one end of each group of soft support sheets is provided with an integrally formed connecting piece. The sidewalls of the two outermost groups of soft support sheets are provided with limiting structures that can limit the movement of the two sides of the flexible circuit board.

[0007] Preferably, the limiting structure includes an extension piece, which is integrally formed on one side of the soft support piece, and the end of the extension piece away from the soft support piece is provided with an integrally formed bend.

[0008] Preferably, the pressing structure includes a prepreg, one end of the rigid circuit board is provided with a rigid substrate corresponding area, one end of the flexible circuit board is provided with a flexible substrate connecting area, and one side of both the rigid substrate corresponding area and the flexible substrate connecting area is provided with a copper foil conductor connecting area.

[0009] The upper and lower surfaces of the prepreg are respectively bonded to the corresponding areas of the rigid substrate and the connecting areas of the flexible substrate, and the corresponding areas of the rigid substrate and the connecting areas of the flexible substrate are fixedly connected after being pressed together by a press.

[0010] Preferably, the fixing structure includes a fixing plate identical to the rigid circuit board substrate, the fixing plate being glued to the rigid circuit board, and a connecting groove being provided on one side of the fixing plate for inserting and gluing a connecting piece.

[0011] Preferably, the fixing plate has a protrusion on the side near the flexible circuit board that can support the root of the junction between the flexible circuit board and the rigid circuit board, and the protrusion is integrally formed with the fixing plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model provides lateral isolation and longitudinal restriction for the flexible circuit boards by setting several sets of soft support sheets arranged side by side between two sets of rigid circuit boards and designing a limiting structure on the side wall of the outermost soft support sheet: the soft support sheets can physically separate adjacent flexible circuit boards and prevent their surfaces from directly touching; the bending structure of the extension sheet can hold the two sides of the flexible circuit board, limiting the displacement of the flexible circuit board during the bending process and reducing the impact of possible signal interference between lines; the flexible circuit boards are clearly layered and do not easily block the assembly position, which helps to reduce the assembly difficulty.

[0014] 2. The integrally formed protrusion on the side of the fixing plate near the flexible circuit board of this utility model can directly support the root of the joint between the flexible circuit board and the rigid circuit board, disperse the stress concentration point when the flexible circuit board is bent, prevent the root from cracking or breaking due to long-term stress, and significantly improve the structural durability of the circuit board. Attached Figure Description

[0015] Figure 1 This is an isometric drawing of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the soft support sheet of this utility model;

[0017] Figure 3 This is a schematic diagram of the pressing structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the fixed structure of this utility model.

[0019] In the diagram: 1. Flexible circuit board; 2. Rigid circuit board; 3. Press-fit structure; 4. Flexible support sheet; 5. Fixing structure;

[0020] 401. Connecting piece; 402. Extension piece; 403. Bending;

[0021] 301. Prepreg; 302. Corresponding area to rigid substrate; 303. Connecting area to flexible substrate; 304. Connecting area to copper foil conductor;

[0022] 501. Fixing plate; 502. Connecting groove; 503. Protrusion. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 This utility model provides a technical solution: a high-density interconnected rigid-flex circuit board, including a flexible circuit board 1 and two sets of rigid circuit boards 2. The two ends of the flexible circuit board 1 are fixedly connected to the two sets of rigid circuit boards 2 through a pressing structure 3. A flexible support sheet 4 is provided between the two sets of rigid circuit boards 2 to support the flexible circuit board 1. The flexible support sheet 4 is fixed to one end of the rigid circuit board 2 through a fixing structure 5.

[0025] The flexible support sheets 4 are arranged in several groups side by side. One end of each group of flexible support sheets 4 is provided with an integrally formed connecting piece 401. The sidewalls of the two outermost groups of flexible support sheets 4 are provided with limiting structures that can limit the two sides of the flexible circuit board 1. By setting the limiting structures, the two sides of the flexible circuit board 1 are restricted to prevent the flexible circuit board 1 from shifting laterally during bending or use.

[0026] The limiting structure includes an extension piece 402, which is integrally formed on one side of the soft support piece 4, and an integrally formed bend 403 is provided at the end of the extension piece 402 away from the soft support piece 4.

[0027] The integrally formed bend 403 of the extension piece 402 away from the soft support piece 4 in the limiting structure can clamp and limit the soft circuit board 1 from the side and the top and bottom directions, restrict the movement range of the soft circuit board 1, and prevent the soft circuit board 1 from shifting.

[0028] The pressing structure 3 includes a prepreg 301. One end of the rigid circuit board 2 is provided with a rigid substrate corresponding area 302, and one end of the flexible circuit board 1 is provided with a flexible substrate connection area 303. Copper foil conductor connection areas 304 are provided on one side of both the rigid substrate corresponding area 302 and the flexible substrate connection area 303.

[0029] The upper and lower surfaces of the prepreg 301 are respectively bonded to the corresponding area 302 of the rigid substrate and the connecting area 303 of the flexible substrate. The corresponding area 302 of the rigid substrate and the connecting area 303 of the flexible substrate are fixedly connected after being pressed together by a presser.

[0030] The upper and lower surfaces of the prepreg 301 are respectively attached to the corresponding area 302 of the rigid substrate and the connecting area 303 of the flexible substrate. Then, pressure and appropriate temperature are applied by a press to cure the prepreg 301, and the corresponding area 302 of the rigid substrate and the connecting area 303 of the flexible substrate are fixedly connected, so as to achieve a stable connection and circuit conduction between the flexible circuit board 1 and the rigid circuit board 2.

[0031] The fixing structure 5 includes a fixing plate 501 that is the same as the rigid circuit board substrate. The fixing plate 501 is glued to the rigid circuit board. A connecting groove 502 is provided on one side of the fixing plate 501 for the connecting piece 401 to be inserted and glued.

[0032] A fixing plate 501 with the same substrate as the rigid circuit board is selected to ensure the compatibility and firmness of the bonding between the fixing plate 501 and the rigid circuit board. A connecting groove 502 is opened on one side of the fixing plate 501. After inserting the connecting piece 401 at one end of the flexible support piece 4 into the connecting groove 502, the flexible support piece 4 is glued to the fixing plate 501, thereby realizing the installation of the flexible support piece 4 on the rigid circuit board 2.

[0033] The fixing plate 501 is provided with a protrusion 503 on the side near the flexible circuit board 1, which can support the root of the joint between the flexible circuit board 1 and the rigid circuit board 2. The protrusion 503 is integrally formed with the fixing plate 501.

[0034] The integrally formed protrusion 503 on the side of the fixing plate 501 near the flexible circuit board 1 fits at the root position where the flexible circuit board 1 and the rigid circuit board 2 meet. When the flexible circuit board 1 is bent, the protrusion 503 can bear part of the force, disperse the stress concentration point at the root of the flexible circuit board 1, reduce stress damage at the root, and play a supporting and protective role for the root of the flexible circuit board 1.

[0035] In use, first prepare a flexible circuit board 1, two sets of rigid circuit boards 2, a flexible support sheet 4, and a fixing structure 5. The two ends of the flexible circuit board 1 are fixedly connected to the two sets of rigid circuit boards 2 using the pressing structure 3. Then, the flexible support sheet 4 is installed at one end of the rigid circuit board 2 using the fixing structure 5, placing the flexible support sheet 4 between the two sets of rigid circuit boards 2 to support the flexible circuit board 1. The flexible support sheet 4 is made of polyimide-based composite material or polyester-based composite material, which can deform along the bending trajectory of the flexible circuit board 4. When the two rigid circuit boards 2 are fixed, the flexible support sheet 4 can be twisted or bent, supporting the flexible circuit board 1 without affecting its connection.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-density interconnect rigid-flex circuit board, characterized in that: It includes a flexible circuit board (1) and two sets of rigid circuit boards (2). The two ends of the flexible circuit board (1) are fixedly connected to the two sets of rigid circuit boards (2) through a pressing structure (3). A flexible support sheet (4) is provided between the two sets of rigid circuit boards (2) to support the flexible circuit board (1). The flexible support sheet (4) is fixed to one end of the rigid circuit board (2) through a fixing structure (5).

2. The high-density interconnect rigid-flex circuit board according to claim 1, characterized in that: The soft support sheet (4) is arranged in several groups side by side. One end of each group of soft support sheets (4) is provided with an integrally formed connecting piece (401). The side walls of the two outermost groups of soft support sheets (4) are provided with a limiting structure that can limit the two sides of the soft circuit board (1).

3. The high-density interconnect rigid-flex circuit board according to claim 2, characterized in that: The limiting structure includes an extension piece (402), which is integrally formed on one side of the soft support piece (4), and an integrally formed bend (403) is provided at the end of the extension piece (402) away from the soft support piece (4).

4. The high-density interconnect rigid-flex circuit board according to claim 3, characterized in that: The pressing structure (3) includes a prepreg (301), one end of the rigid circuit board (2) is provided with a rigid substrate corresponding area (302), one end of the flexible circuit board (1) is provided with a flexible substrate connecting area (303), and one side of the rigid substrate corresponding area (302) and the flexible substrate connecting area (303) are both provided with copper foil conductor connecting areas (304). The upper and lower surfaces of the prepreg (301) are respectively attached to the corresponding area (302) of the rigid substrate and the connecting area (303) of the flexible substrate, and the corresponding area (302) of the rigid substrate and the connecting area (303) of the flexible substrate are fixedly connected after being pressed together by a presser.

5. A high-density interconnect rigid-flex circuit board according to claim 4, characterized in that: The fixing structure (5) includes a fixing plate (501) that is the same as the rigid circuit board substrate. The fixing plate (501) is glued to the rigid circuit board. A connecting groove (502) is provided on one side of the fixing plate (501) for the connecting piece (401) to be inserted and glued.

6. A high-density interconnect rigid-flex circuit board according to claim 5, characterized in that: The fixing plate (501) has a protrusion (503) on the side near the flexible circuit board (1) that can support the root of the joint between the flexible circuit board (1) and the rigid circuit board (2). The protrusion (503) is integrally formed with the fixing plate (501).

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