A fracture-resistant rigid-flex printed circuit board and its processing technology

Abstract

The present invention discloses a fracture-resistant rigid-flex printed circuit board and its processing technology, which relates to the technical field of printed circuit boards and includes a rigid printed circuit board, a fracture prevention component and a splicing fastening component. A flexible printed circuit board is installed in the inner groove of the rigid printed circuit board, and a film bonding layer is fixed between the flexible printed circuit board and the inner groove of the rigid printed circuit board. Plate through holes are formed on both sides between the flexible printed circuit board and the rigid printed circuit board, and filled copper deposition is arranged inside the plate through holes. For this fracture-resistant rigid-flex printed circuit board and its processing technology, two rigid printed circuit boards in a "C" shape structure are installed on the outer sides of the flexible printed circuit board to form a rigid-flex printed circuit board in combination. The setting of the fracture prevention component can prevent the rigid-flex printed circuit board from being broken due to excessive bending, and the outer connection frame and the splicing fastening component facilitate the assembly and splicing between multiple rigid-flex printed circuit boards, and can improve the tightness of the assembly between two rigid-flex printed circuit boards.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit boards, and specifically to a fracture-resistant flexible-rigid printed circuit board and its processing technology. Background Art

[0002] A circuit board can be called a printed wiring board or a printed circuit board, also known as a PCB or an FPC circuit board. The circuit board miniaturizes and visualizes the circuit, and plays an important role in the mass production of fixed circuits and the optimization of the electrical appliance layout. A flexible-rigid board is a flexible printed circuit board and a rigid printed circuit board, which are combined together through processes such as lamination according to relevant process requirements to form a circuit board with FPC characteristics and PCB characteristics.

[0003] During the use of the existing flexible-rigid printed circuit boards, bending and fracture are likely to occur, and it is not convenient to tightly assemble multiple flexible-rigid printed circuit boards. For this reason, we propose a fracture-resistant flexible-rigid printed circuit board and its processing technology. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a fracture-resistant flexible-rigid printed circuit board and its processing technology, which solves the problems raised in the above background art.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A fracture-resistant flexible-rigid printed circuit board includes a rigid circuit board, a fracture prevention component, and a splicing fastening component. A flexible circuit board is installed in the inner groove of the rigid circuit board, and a film bonding layer is fixed between the flexible circuit board and the inner groove of the rigid circuit board. Plate through-holes are provided on both sides between the flexible circuit board and the rigid circuit board, and filled copper deposition is arranged inside the plate through-holes. The fracture prevention component is installed on the upper sides of the rigid circuit board and the flexible circuit board, and the fracture prevention component includes a flexible reinforcement plate, a fixed rubber block, a reinforcing rubber block, and a connecting spring. The flexible reinforcement plate is bonded to the rigid circuit board and the flexible circuit board, and a fixed rubber block is adhesively bonded to the lower side of the middle part of the flexible reinforcement plate. Reinforcing rubber blocks are adhesively bonded to the upper and lower sides at the connection transition between the rigid circuit board and the flexible circuit board, and a connecting spring is arranged outside the reinforcing rubber block. The two ends of the connecting spring are respectively fixedly connected to the rigid circuit board and the flexible circuit board. An outer connection frame is installed outside the rigid circuit board, and connection frame clamping blocks are respectively fixed to the left and right sides inside the outer connection frame. The splicing fastening component is installed on one side of the connection frame clamping block.

[0006] Further, the rigid circuit board has a "C" shape structure, and there are two rigid circuit boards symmetrically arranged about the vertical center line of the flexible circuit board.

[0007] Furthermore, a reinforcing steel sheet is fixed below the rigid circuit board, and a protrusion is fixed at the bottom of the reinforcing steel sheet, and a heat dissipation fin is installed on the lower middle side of the flexible circuit board.

[0008] Furthermore, a card connection component is arranged between the flexible circuit board and the rigid circuit board, and the card connection component includes a first card slot, a first card block, a second card slot and a second card block, the first card slot is arranged on the inner wall of the rigid circuit board, the second card slots are arranged on the outer walls on both sides of the flexible circuit board, the second card block is fixed on the side of the rigid circuit board close to the second card slot, and the first card block is fixed on the side of the flexible circuit board close to the first card slot.

[0009] Furthermore, the flexible reinforcing plate has an I-shaped structure, and the fixed rubber block on the lower side of the flexible reinforcing plate has a hemispherical structure.

[0010] Furthermore, the outer connecting frame is in a "冖"-shaped structure, and an embedding groove is provided on one side of the outer side of the outer connecting frame.

[0011] Furthermore, circuit board clamping blocks are fixed on both the front and rear sides of the flexible circuit board, and the circuit board clamping blocks and the connection frame clamping blocks are both in a "U" shape, and the circuit board clamping blocks and the connection frame clamping blocks are connected by clamping.

[0012] Furthermore, the splicing and fastening assembly includes a spiral spring, a positioning block and a flexible protective layer. The spiral spring is fixedly connected to the connecting frame clamping block, and a positioning block is fixed on one side of the spiral spring. A flexible protective layer is pasted on the inner side of the positioning block.

[0013] Furthermore, the positioning block is in an "L"-shaped structure, and an elastic structure is formed between the positioning block and the connecting frame clamping block through a spiral spring, and the positioning block is slidably connected to the inner wall of the outer connecting frame.

[0014] Furthermore, the processing technology of the fracture-resistant hard-flex circuit board includes the following specific steps:

[0015] Step 1: Cutting and shaping: Cut the substrates of the rigid circuit board and the flexible circuit board separately and set the circuit parts, then press the layers of the rigid circuit board and the flexible circuit board into shape through hot pressing equipment to obtain separate rigid circuit board and flexible circuit board components;

[0016] Step 2, assembly processing: install the flexible circuit board in the inner groove of the two rigid circuit boards in the shape of "匚". During the installation process, the rigid circuit board is connected with the second card slot of the flexible circuit board through the second card block, and the flexible circuit board is connected with the first card slot of the rigid circuit board through the first card block, and the gaps between the first card block and the first card slot and between the second card block and the second card slot are filled with conductive paste. Finally, the connection between the rigid circuit board and the flexible circuit board is vacuumed to make the connection between the two more tightly by vacuum adsorption.

[0017] Step 3: Forming: Open through holes on both sides of the flexible circuit board and the rigid circuit board and set copper filling to connect the rigid circuit board and the flexible circuit board, fix the reinforcing steel sheet and the bump under the rigid circuit board, fix the heat dissipation fin under the middle of the flexible circuit board, and finally fix the reinforcing rubber block, the connecting spring and the flexible reinforcing plate in sequence to obtain the formed rigid-flexible circuit board;

[0018] Step 4, connection and assembly: the outer connection frame with a "冖"-shaped structure is placed on the outside of the rigid circuit boards of the two rigid-flexible circuit boards, and the installation of the outer connection frame is achieved by clamping the circuit board clamping blocks and the connection frame clamping blocks. Then, the positioning blocks with an "L"-shaped structure can slide to the outside of the four corners of the rigid circuit board under the elastic action of the spiral spring, so that the two adjacent rigid circuit boards are elastically limited by the two sets of positioning blocks on both sides of the inner side of the outer connection frame, so that the two rigid circuit boards fit closely, thereby improving the tightness of the assembly between the two rigid-flexible circuit boards.

[0019] The present invention provides a fracture-resistant hard-soft combined circuit board and a processing technology thereof, which has the following beneficial effects:

[0020] The fracture-resistant rigid-flexible circuit board and its processing technology, two rigid circuit boards in a "匚"-shaped structure are installed on both sides of the outside of the flexible circuit board to form a rigid-flexible circuit board. The setting of the anti-fracture group can prevent the rigid-flexible circuit board from excessive bending and fracture, and the external connection frame and the splicing and fastening components are used to facilitate the assembly and splicing of multiple rigid-flexible circuit boards, and can improve the tightness of the assembly between the two rigid-flexible circuit boards.

[0021] 1. The fracture-resistant hard-soft combination circuit board and its processing technology are provided with a hard circuit board and a flexible circuit board. The two sides between the flexible circuit board and the hard circuit board are fixed by a film bonding layer to increase the tightness of the connection. The inside of the through hole of the board is filled with copper to facilitate the circuit conduction between the hard circuit board and the flexible circuit board, and at the same time, the resistance can be effectively reduced. The setting of the reinforcing steel sheet is convenient for enhancing the structural strength of the hard circuit board. The setting of the bottom convex block can prevent wear on the one hand, and on the other hand, it can also make the bottom of the hard circuit board hollowed out front and back, so as to enhance the heat dissipation effect of the hard circuit board, and the heat dissipation fins are convenient for dissipating heat to the flexible circuit board.

[0022] 2. The fracture-resistant hard-soft combination circuit board and its processing technology are provided with a clamping assembly, the hard circuit board is clamped and connected with the second clamping slot of the flexible circuit board through the second clamping block, and the flexible circuit board is clamped and connected with the first clamping slot of the hard circuit board through the first clamping block, so as to facilitate enhancing the tightness of the connection between the flexible circuit board and the hard circuit board, and the gaps between the first clamping block and the first clamping slot and the second clamping block and the second clamping slot are filled with conductive paste, which is an electrical contact coating with good electrical properties, so that the flexible circuit board and the hard circuit board are enhanced to be conductive to each other.

[0023] 3. The fracture-resistant rigid-flexible circuit board and its processing technology are provided with an anti-fracture component. The flexible reinforcing plate with an "I"-shaped structure is used to strengthen the structural strength of the flexible circuit board and the rigid circuit board. At the same time, the "I"-shaped non-full-covering structure of the flexible reinforcing plate will not affect the ventilation and heat dissipation on the upper sides of the two. The fixed rubber block with a hemispherical structure can flexibly press the flexible circuit board when it is bent and deformed, thereby promoting the resetting of the flexible circuit board. The setting of the reinforcing rubber block can enhance the toughness of the transition between the rigid circuit board and the flexible circuit board to avoid wear there. At the same time, the elastic setting of the connecting spring enables the flexible circuit board to be reset under the elastic action when it is bent and deformed, thereby preventing the rigid-flexible circuit board from being excessively bent and broken.

[0024] 4. The fracture-resistant rigid-flexible circuit board and its processing technology are provided with an external connection frame. The external connection frame with a "冖"-shaped structure is convenient for being mounted on the outside of the rigid circuit boards of the two rigid-flexible circuit boards. The installation of the external connection frame is facilitated by the connection between the circuit board clamping block and the connection frame clamping block. Springs can be placed in the grooves on the outside of two adjacent external connection frames, so that the two external connection frames can be assembled together through the elastic connection of the springs, thereby facilitating the assembly and splicing of multiple rigid-flexible circuit boards.

[0025] 5. The anti-fracture rigid-flex printed circuit board and its processing technology are provided with a splicing and fastening component. The positioning block in an "L" shape can slide to the outside of the four corners of the rigid printed circuit board under the elastic action of the scroll spring, so as to facilitate the elastic limit of two adjacent rigid printed circuit boards through the two groups of positioning blocks on both sides inside the outer connection frame, making the two rigid printed circuit boards fit tightly, thereby improving the assembly tightness between the two rigid-flex printed circuit boards. The flexible protective layer inside the positioning block can fit with the outside of the rigid printed circuit board to avoid abrasion of the rigid printed circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. is a top view structural schematic diagram of the rigid printed circuit board and the flexible printed circuit board of an anti-fracture rigid-flex printed circuit board of the present invention;

[0027] Figure 2 FIG. is an overall front view external structural schematic diagram of an anti-fracture rigid-flex printed circuit board of the present invention;

[0028] Figure 3 FIG. is a front view semi-sectional structural schematic diagram of the rigid printed circuit board and the flexible printed circuit board of an anti-fracture rigid-flex printed circuit board of the present invention;

[0029] Figure 4 FIG. is a top view structural schematic diagram of the flexible reinforcement plate of an anti-fracture rigid-flex printed circuit board of the present invention;

[0030] Figure 5 FIG. is an anti-fracture rigid-flex printed circuit board of the present invention Figure 3 The enlarged structural schematic diagram at A in;

[0031] Figure 6 FIG. is a connection and assembly structural schematic diagram of an anti-fracture rigid-flex printed circuit board of the present invention;

[0032] Figure 7 FIG. is a side view clamping structural schematic diagram of the circuit board clamping block and the connection frame clamping block of an anti-fracture rigid-flex printed circuit board of the present invention;

[0033] Figure 8 FIG. is an anti-fracture rigid-flex printed circuit board of the present invention Figure 6 The enlarged structural schematic diagram at B in.

[0034] In the figure: 1, rigid circuit board; 2, flexible circuit board; 3, reinforcing steel sheet; 4, bump; 5, heat dissipation fin; 6, film bonding layer; 7, board through hole; 8, filled copper deposition; 9, clamping component; 901, first card slot; 902, first card block; 903, second card slot; 904, second card block; 10, anti-fracture component; 1001, flexible reinforcement plate; 1002, fixed rubber block; 1003, reinforcing rubber block; 1004, connecting spring; 11, outer connection frame; 12, embedding groove; 13, circuit board clamping block; 14, connection frame clamping block; 15, splicing fastening component; 1501, scroll spring; 1502, positioning block; 1503, flexible protective layer. Detailed implementation manner

[0035] Please refer to Figures 1 to 8 , the present invention provides a technical solution: an anti-fracture rigid-flexible combined circuit board and its processing technology, including a rigid circuit board 1, an anti-fracture component 10 and a splicing fastening component 15. A flexible circuit board 2 is installed in the inner groove of the rigid circuit board 1, and a film bonding layer 6 is fixed between the flexible circuit board 2 and the inner groove of the rigid circuit board 1. Plate through holes 7 are opened on both sides between the flexible circuit board 2 and the rigid circuit board 1, and filled copper deposition 8 is arranged inside the plate through holes 7. The anti-fracture component 10 is installed on the upper sides of the rigid circuit board 1 and the flexible circuit board 2, and the anti-fracture component 10 includes a flexible reinforcement plate 1001, a fixed rubber block 1002, a reinforcing rubber block 1003 and a connecting spring 1004. The flexible reinforcement plate 1001 is bonded to the rigid circuit board 1 and the flexible circuit board 2, and a fixed rubber block 1002 is adhesively bonded to the lower side of the middle part of the flexible reinforcement plate 1001. Reinforcing rubber blocks 1003 are adhesively bonded to the upper and lower sides of the connection transition part between the rigid circuit board 1 and the flexible circuit board 2, and a connecting spring 1004 is arranged outside the reinforcing rubber block 1003. The two ends of the connecting spring 1004 are respectively fixedly connected to the rigid circuit board 1 and the flexible circuit board 2. An outer connection frame 11 is installed outside the rigid circuit board 1, and connection frame clamping blocks 14 are fixedly arranged on the left and right sides inside the outer connection frame 11. The splicing fastening component 15 is installed on one side of the connection frame clamping block 14.

[0036] Please refer to Figures 1 - 3 , the rigid circuit board 1 has a "C"-shaped structure, and two rigid circuit boards 1 are symmetrically arranged about the vertical center line of the flexible circuit board 2;

[0037] Two rigid circuit boards 1 with a "C"-shaped structure are installed on the outer sides of the flexible circuit board 2 to form a rigid-flexible combined circuit board. The two sides between the flexible circuit board 2 and the rigid circuit board 1 are fixed through the film bonding layer 6, which is convenient for increasing the connection tightness. The filled copper deposition 8 arranged inside the plate through holes 7 is convenient for conducting electricity between the rigid circuit board 1 and the flexible circuit board 2, and can effectively reduce the resistance at the same time.

[0038] Please refer to Figure 2 , a reinforcing steel sheet 3 is fixed below the rigid circuit board 1, and a bump 4 is fixed at the bottom of the reinforcing steel sheet 3. A heat dissipation fin 5 is installed on the lower side of the middle part of the flexible circuit board 2;

[0039] The specific operation is as follows. The setting of the reinforcing steel sheet 3 facilitates enhancing the structural strength of the rigid circuit board 1. The setting of the bottom bump 4 can prevent wear on the one hand and make the bottom of the rigid circuit board 1 hollowed out front and back on the other hand, so as to facilitate enhancing the heat dissipation effect of the rigid circuit board 1. The heat dissipation fin 5 facilitates heat dissipation of the flexible circuit board 2.

[0040] Please refer to Figure 3 , a clamping component 9 is arranged between the flexible circuit board 2 and the rigid circuit board 1. The clamping component 9 includes a first clamping groove 901, a first clamping block 902, a second clamping groove 903 and a second clamping block 904. The inner wall of the rigid circuit board 1 is provided with the first clamping groove 901, the outer walls on both sides of the flexible circuit board 2 are provided with the second clamping grooves 903, a second clamping block 904 is fixed on one side of the rigid circuit board 1 close to the second clamping groove 903, and a first clamping block 902 is fixed on one side of the flexible circuit board 2 close to the first clamping groove 901;

[0041] The specific operation is as follows. The rigid circuit board 1 is clamped and connected to the second clamping groove 903 of the flexible circuit board 2 through the second clamping block 904, and the flexible circuit board 2 is clamped and connected to the first clamping groove 901 of the rigid circuit board 1 through the first clamping block 902, so as to facilitate enhancing the connection tightness between the flexible circuit board 2 and the rigid circuit board 1. And conductive paste is filled in the gaps between the first clamping block 902 and the first clamping groove 901, and between the second clamping block 904 and the second clamping groove 903. The conductive paste is an electrically conductive contact coating with good electrical properties, making the flexible circuit board 2 and the rigid circuit board 1 conduct electricity with each other.

[0042] Please refer to Figure 2 and Figures 4 - 5 , the flexible reinforcing plate 1001 has an "I"-shaped structure, and the fixed rubber block 1002 on the lower side of the flexible reinforcing plate 1001 has a hemispherical structure;

[0043] The flexible reinforcing plate 1001 with an "I"-shaped structure facilitates strengthening the structural strength of the flexible circuit board 2 and the rigid circuit board 1. At the same time, the "I"-shaped non-full-covering structure of the flexible reinforcing plate 1001 will not affect the ventilation and heat dissipation on the upper sides of the two. The fixed rubber block 1002 with a hemispherical structure can flexibly press the flexible circuit board 2 when it is bent and deformed, thereby promoting the resetting of the flexible circuit board 2. The setting of the reinforcing rubber block 1003 can enhance the toughness of the transition between the rigid circuit board 1 and the flexible circuit board 2 to avoid wear there. At the same time, the elastic setting of the connecting spring 1004 enables the flexible circuit board 2 to be reset under the elastic action when it is bent and deformed, thereby preventing the hard-soft combined circuit board from excessive bending and breakage.

[0044] See also Figures 6 - 7 The outer connection frame 11 is in a "冖" shape, and an embedding groove 12 is provided on one side of the outer side of the outer connection frame 11; circuit board clamping blocks 13 are fixed to both the front and rear sides of the flexible circuit board 2, and the circuit board clamping blocks 13 and the connection frame clamping blocks 14 are both in a "U" shape, and the circuit board clamping blocks 13 and the connection frame clamping blocks 14 are clamped together;

[0045] The specific operation is as follows: the external connecting frame 11 with a "冖"-shaped structure is convenient for being mounted on the outside of the rigid circuit board 1 of the two rigid-flexible circuit boards. The external connecting frame 11 is conveniently installed by means of a clamping connection between the circuit board clamping block 13 and the connecting frame clamping block 14. Springs can be placed in the embedding grooves 12 on the outsides of the two adjacent external connecting frames 11, thereby facilitating the assembly of the two external connecting frames 11 through the elastic connection of the springs, and further facilitating the assembly and splicing of multiple rigid-flexible circuit boards.

[0046] See also Figure 6 and Figure 8 , the splicing and fastening assembly 15 includes a scroll spring 1501, a positioning block 1502 and a flexible protective layer 1503, the scroll spring 1501 is fixedly connected to the connecting frame clamping block 14, and the positioning block 1502 is fixed on one side of the scroll spring 1501, and the flexible protective layer 1503 is pasted on the inner side of the positioning block 1502; the positioning block 1502 is in an "L"-shaped structure, and the positioning block 1502 forms an elastic structure through the scroll spring 1501 and the connecting frame clamping block 14, and the positioning block 1502 is slidably connected to the inner wall of the outer connecting frame 11;

[0047] The specific operation is as follows: the positioning block 1502 with an "L"-shaped structure can slide to the outside of the four corners of the rigid circuit board 1 under the elastic action of the spiral spring 1501, so that the two adjacent rigid circuit boards 1 can be elastically limited by the two groups of positioning blocks 1502 on both sides of the inner side of the outer connection frame 11, so that the two rigid circuit boards 1 are tightly fitted, thereby improving the tightness of the assembly between the two soft-hard combined circuit boards, and the flexible protective layer 1503 on the inner side of the positioning block 1502 can fit with the outside of the rigid circuit board 1 to avoid wear on the rigid circuit board 1.

[0048] The processing technology of fracture-resistant rigid-flex circuit boards includes the following specific steps:

[0049] Step 1: Cutting and shaping: Cut the substrates of the rigid circuit board 1 and the flexible circuit board 2 respectively and set the circuit parts, then press the layers of the rigid circuit board 1 and the flexible circuit board 2 into shape by hot pressing equipment to obtain separate rigid circuit board 1 and flexible circuit board 2 components;

[0050] Step 2, assembly processing: install the flexible circuit board 2 in the inner groove of the two rigid circuit boards 1 in the shape of "匚". During the installation process, the rigid circuit board 1 is connected with the second card slot 903 of the flexible circuit board 2 through the second card block 904, and the flexible circuit board 2 is connected with the first card slot 901 of the rigid circuit board 1 through the first card block 902, and the gaps between the first card block 902 and the first card slot 901, and the gaps between the second card block 904 and the second card slot 903 are filled with conductive paste, and finally the connection between the rigid circuit board 1 and the flexible circuit board 2 is vacuumed, so that the connection between the two is made tighter by vacuum adsorption;

[0051] Step 3, molding processing: a through-hole 7 is opened on both sides between the flexible circuit board 2 and the rigid circuit board 1 and a copper filling 8 is set, so as to conduct the circuit between the rigid circuit board 1 and the flexible circuit board 2, and a reinforcing steel sheet 3 and a bump 4 are fixed under the rigid circuit board 1, and a heat dissipation fin 5 is fixed under the middle of the flexible circuit board 2. Finally, the reinforcing rubber block 1003, the connecting spring 1004 and the flexible reinforcing plate 1001 are fixed in sequence, and a molded rigid-flexible circuit board can be obtained;

[0052] Step 4, connection and assembly: the outer connection frame 11 with a "冖"-shaped structure is mounted on the outside of the rigid circuit board 1 of the two rigid-flexible circuit boards, and the installation of the outer connection frame 11 is achieved by clamping the circuit board clamping block 13 and the connection frame clamping block 14, and then the positioning block 1502 with an "L"-shaped structure can slide to the outside of the four corners of the rigid circuit board 1 under the elastic action of the spiral spring 1501, so that the two adjacent rigid circuit boards 1 are elastically limited by the two groups of positioning blocks 1502 on both sides of the inner side of the outer connection frame 11, so that the two rigid circuit boards 1 are tightly fitted, thereby improving the tightness of the assembly between the two rigid-flexible circuit boards.

[0053] In summary, the anti-fracture soft-hard combination circuit board and its processing technology, when used, first install the flexible circuit board 2 in the inner groove of the two rigid circuit boards 1 in the shape of "匚", and during the installation process, the rigid circuit board 1 is connected with the second card slot 903 of the flexible circuit board 2 through the second card block 904, and the flexible circuit board 2 is connected with the first card slot 901 of the rigid circuit board 1 through the first card block 902, so as to enhance the tightness of the connection between the flexible circuit board 2 and the rigid circuit board 1, and the gaps between the first card block 902 and the first card slot 901, and the gaps between the second card block 904 and the second card slot 903 are filled with conductive paste, which is an electrical contact coating with good electrical properties, so that the flexible circuit board 2 and the rigid circuit board 1 are mutually conductive, and at the same time, the two sides between the flexible circuit board 2 and the rigid circuit board 1 are fixed by the film bonding layer 6;

[0054] Then, through holes 7 are opened on both sides between the flexible circuit board 2 and the rigid circuit board 1 and filled with copper 8, so that the circuit of the rigid circuit board 1 and the flexible circuit board 2 can be connected, and the resistance can be effectively reduced. During use, the setting of the reinforcing steel sheet 3 can enhance the structural strength of the rigid circuit board 1. The setting of the bottom bump 4 can prevent wear on the one hand, and on the other hand, it can also make the bottom of the rigid circuit board 1 hollowed out front and back, so as to enhance the heat dissipation effect of the rigid circuit board 1. The heat dissipation fins 5 can dissipate heat for the flexible circuit board 2;

[0055] When in use, the structural strength of the flexible circuit board 2 and the rigid circuit board 1 can be strengthened by the flexible reinforcing plate 1001 of the “I” shape structure. At the same time, the “I” shape non-full-covering structure of the flexible reinforcing plate 1001 will not affect the ventilation and heat dissipation on the upper sides of the two. The fixed rubber block 1002 of the hemispherical structure can flexibly press the flexible circuit board 2 when it is bent and deformed, thereby promoting the reset of the flexible circuit board 2. The setting of the reinforcing rubber block 1003 can enhance the toughness of the transition between the rigid circuit board 1 and the flexible circuit board 2 to avoid wear there. At the same time, the elastic setting of the connecting spring 1004 enables the flexible circuit board 2 to reset under the elastic action when it is bent and deformed, thereby preventing the hard-soft combined circuit board from being excessively bent and broken.

[0056] When multiple rigid-flexible circuit boards need to be assembled, the outer connecting frame 11 with a "冖"-shaped structure can be sleeved on the outer sides of the rigid circuit boards 1 of the two rigid-flexible circuit boards, and the installation of the outer connecting frame 11 can be achieved by clamping the circuit board clamping block 13 and the connecting frame clamping block 14, and springs can be placed in the outer grooves 12 of the two adjacent outer connecting frames 11, so that the two outer connecting frames 11 can be assembled through the elastic connection of the springs, thereby facilitating the assembly and splicing of multiple rigid-flexible circuit boards, and then the positioning block 1502 with an "L"-shaped structure can be in the vortex Under the elastic action of the coil spring 1501, it slides to the outside of the four corners of the rigid circuit board 1, so that the two adjacent rigid circuit boards 1 can be elastically limited by the two sets of positioning blocks 1502 on both sides of the inner side of the outer connection frame 11, so that the two rigid circuit boards 1 are tightly fitted, thereby improving the tightness of the assembly between the two soft-hard combination circuit boards, wherein the flexible protective layer 1503 on the inner side of the positioning block 1502 can fit with the outside of the rigid circuit board 1 to avoid wear on the rigid circuit board 1, thus completing the entire use process of the anti-fracture soft-hard combination circuit board and its processing technology.

Claims

1. An anti-fracture rigid-flex printed circuit board, characterized in that, it includes a rigid circuit board (1), an anti-fracture component (10) and a splicing fastening component (15). A flexible circuit board (2) is installed in the inner groove of the rigid circuit board (1), and a film bonding layer (6) is fixed between the flexible circuit board (2) and the inner groove of the rigid circuit board (1). Plate through-holes (7) are formed on both sides between the flexible circuit board (2) and the rigid circuit board (1), and filled copper deposits (8) are arranged inside the plate through-holes (7). The anti-fracture component (10) is installed on the upper sides of the rigid circuit board (1) and the flexible circuit board (2), and the anti-fracture component (10) includes a flexible reinforcing plate (1001), a fixed rubber block (1002), a reinforcing rubber block (1003) and a connecting spring (1004). The flexible reinforcing plate (1001) is bonded to the rigid circuit board (1) and the flexible circuit board (2), and a fixed rubber block (1002) is adhesively bonded to the lower side of the middle part of the flexible reinforcing plate (1001). Reinforcing rubber blocks (1003) are adhesively bonded to both the upper and lower sides at the connection transition between the rigid circuit board (1) and the flexible circuit board (2), and a connecting spring (1004) is arranged on the outer side of the reinforcing rubber block (1003). The two ends of the connecting spring (1004) are respectively fixedly connected to the rigid circuit board (1) and the flexible circuit board (2). An outer connection frame (11) is installed outside the rigid circuit board (1), and connection frame clamping blocks (14) are respectively fixed on the left and right sides inside the outer connection frame (11). The splicing fastening component (15) is installed on one side of the connection frame clamping block (14).

2. The anti-fracture rigid-flex printed circuit board according to claim 1, characterized in that, the rigid circuit board (1) has a "C" shape structure, and there are two rigid circuit boards (1) symmetrically arranged about the vertical center line of the flexible circuit board (2).

3. The anti-fracture rigid-flex printed circuit board according to claim 2, characterized in that, a reinforcing steel sheet (3) is fixed below the rigid circuit board (1), and a convex block (4) is fixed at the bottom of the reinforcing steel sheet (3). A heat dissipation fin (5) is installed on the lower side of the middle part of the flexible circuit board (2).

4. The anti-fracture rigid-flex printed circuit board according to claim 3, characterized in that, a clamping component (9) is arranged between the flexible circuit board (2) and the rigid circuit board (1), and the clamping component (9) includes a first card slot (901), a first card block (902), a second card slot (903) and a second card block (904). The inner wall of the rigid circuit board (1) is provided with the first card slot (901), the outer walls on both sides of the flexible circuit board (2) are provided with the second card slots (903), a second card block (904) is fixed on one side of the rigid circuit board (1) close to the second card slot (903), and a first card block (902) is fixed on one side of the flexible circuit board (2) close to the first card slot (901).

5. The anti-fracture rigid-flex printed circuit board according to claim 4, characterized in that, The flexible reinforcing plate (1001) has an I-shaped structure, and the fixed rubber block (1002) on the lower side of the flexible reinforcing plate (1001) has a hemispherical structure.

6. The fracture-resistant rigid-flexible circuit board according to claim 5, It is characterized in that The outer connection frame (11) is in a "冖"-shaped structure, and an embedding groove (12) is provided on one side of the outer side of the outer connection frame (11).

7. The fracture-resistant rigid-flexible circuit board according to claim 6, It is characterized in that Circuit board clamping blocks (13) are fixed to both the front and rear sides of the flexible circuit board (2), and the circuit board clamping blocks (13) and the connecting frame clamping blocks (14) are both in a "U"-shaped structure, and the circuit board clamping blocks (13) and the connecting frame clamping blocks (14) are connected by clamping.

8. The fracture-resistant rigid-flexible circuit board according to claim 7, It is characterized in that The splicing and fastening assembly (15) comprises a spiral spring (1501), a positioning block (1502) and a flexible protective layer (1503); the spiral spring (1501) is fixedly connected to the connecting frame clamping block (14); a positioning block (1502) is fixed to one side of the spiral spring (1501); and a flexible protective layer (1503) is adhered to the inner side of the positioning block (1502).

9. The fracture-resistant rigid-flexible circuit board according to claim 8, It is characterized in that The positioning block (1502) is of an "L"-shaped structure, and an elastic structure is formed between the positioning block (1502) and the connecting frame clamping block (14) through the spiral spring (1501), and the positioning block (1502) and the inner wall of the outer connecting frame (11) are slidably connected.

10. A process for manufacturing a fracture-resistant rigid-flexible circuit board according to claim 9, It is characterized in that The processing technology of the fracture-resistant hard-flex circuit board includes the following specific steps: Step 1: Cutting and shaping: Cut the substrates of the rigid circuit board (1) and the flexible circuit board (2) respectively and set the circuit parts, then press the layers of the rigid circuit board (1) and the flexible circuit board (2) into shape by hot pressing equipment to obtain separate rigid circuit board (1) and flexible circuit board (2) components; Step 2, assembly processing: installing the flexible circuit board (2) in the inner grooves of the two rigid circuit boards (1) in a "匚"-shaped structure. During the installation process, the rigid circuit board (1) is connected to the second card slot (903) of the flexible circuit board (2) through the second card block (904), and the flexible circuit board (2) is connected to the first card slot (901) of the rigid circuit board (1) through the first card block (902). Conductive paste is filled in the gaps between the first card block (902) and the first card slot (901), and between the second card block (904) and the second card slot (903). Finally, vacuuming is performed on the connection between the rigid circuit board (1) and the flexible circuit board (2), so that the connection between the two is made tighter by vacuum adsorption. Step 3, molding processing: plate through holes (7) are opened on both sides between the flexible circuit board (2) and the rigid circuit board (1) and filled with copper (8), so as to conduct the circuit between the rigid circuit board (1) and the flexible circuit board (2), and a reinforcing steel sheet (3) and a bump (4) are fixed below the rigid circuit board (1), and a heat dissipation fin (5) is fixed below the middle of the flexible circuit board (2). Finally, the reinforcing rubber block (1003), the connecting spring (1004) and the flexible reinforcing plate (1001) are fixed in sequence, and a molded rigid-flexible circuit board can be obtained; Step 4: connection and assembly: an outer connection frame (11) with a "冖"-shaped structure is sleeved on the outer sides of the rigid circuit boards (1) of the two rigid-flexible circuit boards, and the installation of the outer connection frame (11) is realized by the clamping connection between the circuit board clamping block (13) and the connection frame clamping block (14), and then the positioning block (1502) with an "L"-shaped structure can slide to the outer sides of the four corners of the rigid circuit board (1) under the elastic action of the spiral spring (1501), so that the two adjacent rigid circuit boards (1) are elastically limited by the two groups of positioning blocks (1502) on both sides of the inner side of the outer connection frame (11), so that the two rigid circuit boards (1) are closely fitted, thereby improving the tightness of the assembly between the two rigid-flexible circuit boards.

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