Flexible circuit board hot pressing precision alignment fixture and flexible circuit board connection method

Abstract

The present invention discloses a flexible circuit board hot pressing precision alignment jig, comprising a substrate and connected to the substrate: a first circuit board positioning structure; a second circuit board adjustment structure; and a flexible circuit board adjustment structure, comprising a base and a bracket rotatably connected to the base, a suction cup for placing the flexible circuit board is provided on the bracket, the flexible circuit board adjustment structure also includes a control valve for controlling whether the suction cup is in a vacuum state, the bracket can be operably rotated between a first position and a second position, in the first position, the suction cup adsorbs the flexible circuit board under the action of the control valve; in the second position, the suction cup is located above the first circuit board positioning structure and the second circuit board adjustment structure, and the suction cup releases the flexible circuit board under the action of the control valve to enable the flexible circuit board to achieve precise alignment with the first circuit board and the second circuit board. The jig makes the connection between the printed circuit board and the flexible circuit board tighter and more reliable, and can meet the limitations of a small space.

Description

Technical Field

[0001] The present invention relates to the technical field of printed circuit boards, and in particular to a flexible circuit board hot pressing precision alignment jig and a flexible circuit board connection method. Background Art

[0002] Printed circuit boards provide electrical connections for electronic components. Their design is mainly layout design. The main advantage of using printed circuit boards is that they greatly reduce wiring and assembly errors, and improve automation levels and labor efficiency.

[0003] At present, the connection between printed circuit boards is generally achieved by welding connecting terminals on the printed circuit boards, and then connecting through flat cables or flexible circuit boards. Regardless of whether flat cables or flexible circuit boards are used, since the connecting terminals need to be welded on the printed circuit boards, a large space is required, especially a large thickness dimension in the vertical direction of the printed circuit boards. The current development trend of electronic products is small and ultra-thin, so the existing technology can no longer meet market demand. At the same time, due to the use of connecting terminals, vibrations are inevitable during the use of electronic products, and loose connections cause poor contact.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a new flexible circuit board hot pressing precision alignment fixture to achieve a tighter and more reliable connection between the printed circuit board and the flexible circuit board. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a flexible circuit board hot pressing precision alignment jig, so that the pins of the flexible circuit board can be accurately aligned with the corresponding pins of the printed circuit board, so that the flexible circuit board can be soldered to the printed circuit board through hot pressing technology, and the size of the assembled circuit board in the thickness direction can be reduced, thereby meeting the market's pursuit of miniaturization of electronic products.

[0006] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0007] A flexible circuit board hot pressing precision alignment jig, the flexible circuit board hot pressing precision alignment jig comprising a substrate and connected to the substrate:

[0008] A first circuit board positioning structure, used for receiving and positioning a first circuit board;

[0009] A second circuit board adjustment structure, used for receiving and adjusting the position of a second circuit board so that the second circuit board is aligned with the first circuit board along a first direction;

[0010] And a flexible circuit board adjustment structure, including a base and a bracket rotatably connected to the base, the bracket is provided with a suction cup for placing the flexible circuit board, the flexible circuit board adjustment structure also includes a control valve for controlling whether the suction cup is in a vacuum state, the bracket is operably rotated between a first position and a second position, in the first position, the suction cup adsorbs the flexible circuit board under the action of the control valve; in the second position, the suction cup is located above the first circuit board positioning structure and the second circuit board adjustment structure, and the suction cup releases the flexible circuit board under the action of the control valve to enable the flexible circuit board to be accurately aligned with the first circuit board and the second circuit board.

[0011] As a further improvement of the present invention, the base is arranged parallel to the first direction, and the bracket can rotate around the central axis of the base.

[0012] As a further improvement of the present invention, the base is slidably connected to the substrate, and the flexible circuit board adjustment structure also includes a first screw micrometer linked to the base, and the first screw micrometer can be operably rotated to adjust the position of the base along a second direction, and the second direction is perpendicular to the first direction.

[0013] As a further improvement of the present invention, the first micrometer includes a first fixed block fixed to the substrate and a first adjusting rod passing through the first fixed block, the first end of the first adjusting rod presses against the base, and the second end of the first adjusting rod can be operably rotated so that the first end of the first adjusting rod pushes the base.

[0014] As a further improvement of the present invention, the flexible circuit board adjustment structure further includes limit blocks disposed on both sides of the bracket, and in the first position of the bracket, the two limit blocks define two side edges of the suction cup.

[0015] As a further improvement of the present invention, the first circuit board positioning structure includes a first support block connected to the substrate, the first support block provides a support surface for accommodating the first circuit board, the first support block includes at least a positioning column protruding from the support surface, and the positioning column is arranged at the center of the support surface.

[0016] As a further improvement of the present invention, the first support block further includes a positioning pin, and the positioning pin is arranged between the center and the outer edge of the support surface.

[0017] As a further improvement of the present invention, two external positioning blocks are connected to the first supporting block, the two external positioning blocks are arranged at the outer edge of the supporting surface, and the connecting line of the two external positioning blocks does not pass through the center of the supporting surface.

[0018] As a further improvement of the present invention, the second circuit board adjustment structure includes a second support block connected to the substrate, the second support block is provided with a positioning surface for placing the second circuit board and a protruding pin extending in a direction perpendicular to the positioning surface, the second support block also includes a stopper provided on one side of the positioning surface along the first direction, and a boss provided on both sides of the positioning surface along the second direction, the second direction being perpendicular to the first direction.

[0019] As a further improvement of the present invention, the second support block is slidably connected to the substrate along the second direction, and the second circuit board adjustment structure also includes a second micrometer screw arranged on one side of the second support block along the second direction, and the second micrometer screw can be operably rotated to push the second support block.

[0020] As a further improvement of the present invention, the second circuit board adjustment structure further includes an elastic retaining member, one end of the elastic retaining member is connected to the second supporting block, and the other end of the elastic retaining member is connected to the fixing block.

[0021] As a further improvement of the present invention, the second circuit board adjustment structure further includes a screw member arranged along the first direction, and the screw member is arranged between the second supporting block and the base plate.

[0022] Another object of the present invention is to provide a method for connecting printed circuit boards to achieve the connection between two printed circuit boards, eliminating the process of welding connecting terminals and wiring, simplifying operations, saving space, and achieving the development of circuit boards in the direction of being smaller and thinner.

[0023] A method for connecting a flexible circuit board, comprising the above-mentioned flexible circuit board hot pressing precision alignment fixture, the method comprising the following steps:

[0024] positioning the first circuit board;

[0025] Positioning and adjusting the second circuit board so that the second circuit board is aligned with the first circuit board along the first direction;

[0026] When the bracket is in the first position, the flexible circuit board is placed, and the control valve is operated to make the suction cup absorb the flexible circuit board;

[0027] Moving the bracket from a first position to a second position;

[0028] Adjusting the position of the base so that the flexible circuit board is aligned with the first circuit board and the second circuit board along a first direction;

[0029] Operating the control valve to allow the suction cup to release the flexible circuit board;

[0030] The flexible circuit board is electrically connected to the first circuit board and the second circuit board by using a hot pressing technology.

[0031] The beneficial effects of the present invention are as follows: by using a flexible circuit board hot pressing precision alignment jig and a flexible circuit board connection method, the pins of the flexible circuit board can be accurately aligned to the pins of the printed circuit board, and then the flexible circuit board can be welded to the printed circuit board through hot pressing technology, thus meeting the limitation of a small space, and at the same time, the welded flexible circuit board is very precisely combined with the printed circuit board, and will not cause the problem of looseness and poor contact.

[0032] By using the alignment fixture, the welding positioning of the flexible circuit board on multiple printed circuit boards can be simultaneously met.

[0033] After the fine-tuning of the hot pressing precision alignment jig for flexible circuit boards is completed, a spring is used to maintain the position, and the operation repeatability is high.

[0034] The flexible circuit board hot pressing precision alignment fixture is highly adjustable and can be fine-tuned in the positive and negative directions of the first and second directions.

[0035] The flexible circuit board hot pressing precision alignment fixture contains two sets of screw micrometers with high positioning and adjustment accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a schematic diagram of the three-dimensional structure of a hot pressing precision alignment jig for a flexible circuit board in a specific embodiment of the present invention;

[0038] Figure 2 It is a schematic diagram of the three-dimensional structure of the first circuit board positioning structure in a specific implementation manner of the present invention;

[0039] Figure 3 It is a schematic diagram of the three-dimensional structure of the second circuit board adjustment structure in a specific embodiment of the present invention;

[0040] Figure 4 for Figure 3 A schematic diagram of a three-dimensional structure of the second circuit board adjustment structure from another perspective;

[0041] Figure 5 It is a schematic diagram of the three-dimensional structure of the flexible circuit board adjustment structure in a specific implementation manner of the present invention.

[0042] 1. First circuit board positioning structure 2. Second circuit board adjustment structure 3. Flexible circuit board adjustment structure

[0043] 4. Control valve 5. Base plate 6. External positioning block

[0044] 7. Positioning pin 8. Positioning column 9. First support block

[0045] 10. Limit block 11. First micrometer screw 12. Base

[0046] 13. Slide rail 14. First adjustment rod 15. Second micrometer screw

[0047] 16. Elastic retainer 17. Lug 18. Boss

[0048] 19. slideway 20. threaded member 21. bracket

[0049] 22. Suction cup 23. Rotating sleeve 25. Fastener

[0050] 26. Operating armrest 27. Second support block 28. Stopper

[0051] 29, second fixing block 30, second adjusting rod 31, first fixing block DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0053] Ginseng Figure 1As shown, a specific embodiment of the present invention discloses a flexible circuit board hot pressing precision alignment jig, the device includes a substrate 5 and a first circuit board positioning structure 1 connected to the substrate 5, for receiving and positioning the first circuit board; a second circuit board adjustment structure 2, for receiving and adjusting the position of the second circuit board so that the second circuit board is aligned with the first circuit board along a first direction; and a flexible circuit board adjustment structure 3, including a base 12 and a bracket 21 rotatably connected to the base 12, the bracket 21 is provided with a suction cup 22 for placing the flexible circuit board, the flexible circuit board adjustment structure 3 also includes a control valve 4 for controlling whether the suction cup 22 is in a vacuum state, the bracket 21 is operably rotated between a first position and a second position, in the first position, the suction cup 22 adsorbs the flexible circuit board under the action of the control valve 4; in the second position, the suction cup 22 is located above the first circuit board positioning structure 1 and the second circuit board adjustment structure 2, and the suction cup 22 releases the flexible circuit board under the action of the control valve 4 so that the flexible circuit board is accurately aligned with the first circuit board and the second circuit board.

[0054] Specifically, an anisotropic conductive film is pre-arranged on the first and second circuit boards, and conductive pins are arranged on the relative planes of the first and second circuit boards and the flexible circuit board. After the flexible circuit board and the first and second circuit boards are accurately aligned by the above-mentioned flexible circuit board hot pressing precision alignment jig, the conductive particles in the anisotropic conductive film in the first and second circuit boards are crushed by hot pressing technology to achieve the purpose of conduction. Compared with the traditional circuit board connection method, this method greatly reduces the thickness of the circuit board, which is conducive to the development of electronic products in a thinner and lighter direction. In addition, the circuit board conducted by hot pressing technology, because the flexible circuit board and the first and second circuit boards are more tightly combined in the thickness direction, it also overcomes the problem of poor contact caused by loosening of the connection terminals between the flexible circuit board and the first and second circuit boards due to accidents such as vibration and falling.

[0055] In this embodiment, the flexible circuit board hot pressing precision alignment jig includes a substrate 5 and a first circuit board positioning structure 1, a second circuit board adjustment structure 2 and a flexible circuit board adjustment structure 3 arranged on the substrate 5. The three basic structures can be detachably connected to the substrate 5.

[0056] Furthermore, combined with Figure 1 and Figure 5As shown, the base 12 is arranged parallel to the first direction, and the bracket 21 can rotate around the central axis of the base 12. Define the left and right direction on the paper as the first direction, the base 12 is extended in a direction parallel to the first direction, has a central axis (not shown), and the bracket 21 rotates around the central axis as the rotation axis. Specifically, the bracket 21 includes a rotating sleeve 23 and a rotating arm arranged perpendicular to the rotating sleeve 23. The rotating sleeve 23 is a hollow part. The rotating sleeve 23 is fixed to the base 12 by an optical axis fastener 25 passing through it, and can rotate relative to the fastener 25, so that the bracket 21 rotates around the central axis of the base 12. In this embodiment, the bracket 21 can be rotated 180° around the central axis of the base 12, so that the bracket 21 is placed and adsorbed on the flexible circuit board at a first position parallel to the plane where the substrate 5 is located, so that the plane with preset pins faces upward; when the bracket 21 is rotated to the second position, the plane with preset pins of the flexible circuit board faces downward, and the suction cup 22 can release the flexible circuit board under the action of the control valve 4, so that the flexible circuit board just covers the pins corresponding to the first and second circuit boards, which is convenient for the pins on the flexible circuit board to be electrically connected with the pins corresponding to the first and second circuit boards through hot pressing technology.

[0057] Preferably, an operating arm 26 is provided at one end of the rotating arm away from the rotating sleeve 23 for easy holding, and the operating arm 26 extends in a direction parallel to the first direction.

[0058] In the flexible circuit board hot pressing precision alignment jig of the present invention, in order to ensure the connection effect between the flexible circuit board and the first and second circuit boards, it is necessary to control the alignment accuracy between the first circuit board and the second circuit board, as well as the alignment accuracy between the flexible circuit board and the first and second circuit boards. In order to achieve the above purpose, the flexible circuit board hot pressing precision alignment jig includes a plurality of position adjustment structures to achieve that the flexible circuit board can be adjusted in both the X direction and the Y direction on a plane parallel to the plane where the substrate 5 is located. The positioning or position adjustable structure of the flexible circuit board hot pressing precision alignment jig is described in detail below.

[0059] See also Figure 2 As shown, the first circuit board positioning structure 1 includes a first support block 9 connected to the substrate 5, the first support block 9 provides a support surface for accommodating the first circuit board, and the first support block 9 includes at least a positioning column 8 protruding from the support surface, and the positioning column 8 is arranged at the center of the support surface. The arrangement of the positioning column 8 facilitates the placement of the first circuit board. In this way, the first circuit board positioning structure 1 provides a circuit board support surface as a reference, so that the first circuit board placed thereon is used as a reference, and the second circuit board and the flexible circuit board need to make adaptive adjustments with reference to the position of the first circuit board.

[0060] In this embodiment, the first support block 9 is further provided with a positioning pin 7, and the positioning pin 7 is arranged between the center and the outer edge of the support surface. The positioning pin 7 and the positioning column 8 cooperate to play a role of precise positioning, so that the first circuit board is placed on the support surface as required and is limited.

[0061] Preferably, the first support block 9 is also connected to two external positioning blocks 6, which are arranged at the outer edge of the support surface, and the connecting line of the two external positioning blocks 6 does not pass through the center of the support surface, and the external positioning blocks 6 have the initial positioning and foolproofing functions. In this embodiment, the two external positioning blocks 6 are provided with L-shaped bosses at positions close to the outer edge of the support surface, and the two second support blocks 27 clamp the first circuit board from opposite directions. The external positioning blocks 6 are connected to the first support block 9 in a detachable manner.

[0062] See also Figure 3 , Figure 4 As shown, the second circuit board adjustment structure 2 includes a second support block 27 connected to the base plate 5, the second support block 27 is provided with a positioning surface for placing the second circuit board and a convex pin 17 extending in a direction perpendicular to the positioning surface, the second support block 27 also includes a stopper 28 provided on one side of the positioning surface along the first direction, and a boss 18 provided on both sides of the positioning surface along the second direction, the second direction being perpendicular to the first direction. The second support block 27 forms a positioning surface for supporting the second circuit board, and the convex pin 17 and boss 18 thereon are used to limit the second circuit board from the first direction and the second direction to prevent the second circuit board from shifting on the positioning surface.

[0063] The second support block 27 is slidably connected to the base plate 5 along the second direction, and the second circuit board adjustment structure 2 further includes a second screw micrometer 15 provided on one side of the second support block 27 along the second direction, and the second screw micrometer 15 is operable to rotate to push the second support block 27. Specifically, a slide rail 19 is provided on the bottom surface of the second support block 27, and a slideway matching the slide rail 19 is provided on the base plate 5. The second support block 27 can reciprocate along the second direction through the cooperation of the slide rail and the slideway, so as to facilitate the alignment of the second circuit board relative to the first circuit board along the second direction. Of course, the positions of the slide rail and the slideway can be swapped.

[0064] The alignment of the second circuit board relative to the first circuit board along the second direction is achieved by the second micrometer screw 15, which includes a second fixed block 29 fixed to the substrate 5 and a second adjustment rod 30 passing through the second fixed block 29, the first end of the second adjustment rod 30 presses against the second support block 27, and the second end of the second adjustment rod 30 is operably rotated so that the first end of the second adjustment rod 30 pushes the second support block 27. Preferably, the first end of the second adjustment rod 30 is arranged relative to the boss 18 on the second support block 27 to increase the contact area.

[0065] In the present embodiment, the second circuit board adjustment structure 2 further includes an elastic retainer 16, one end of which is connected to the second support block 27, and the other end is connected to the second fixed block 29. Specifically, the second support block 27 and the second fixed block 29 are respectively provided with support columns, and the two ends of the elastic retainer 16 are arranged in a ring shape that can be sleeved on the pillar. The elastic retainer 16 can be a compression spring or a tension spring. The elastic restoring force of the elastic retainer 16 makes it easier for the second support plate to maintain its position, so that the second support plate can not only move in the direction away from the second fixed block 29 along the second direction, but also drive the second support block 27 to move in the direction close to the second fixed block 29 when the second micrometer 15 rotates in the opposite direction, thereby realizing the positive and negative movement of the second circuit board along the second direction, which is conducive to fine adjustment in comparison with the position of the first circuit board.

[0066] The second support block 27 can not only reciprocate along the second direction, but also reciprocate along the first direction: the second circuit board adjustment structure 2 also includes a threaded member 20 arranged along the first direction, and the threaded member 20 is arranged between the second support block 27 and the substrate 5. Specifically, the threaded member 20 can be a screw or a bolt, and the threaded member 20 includes a head and a rod. The second support block 27 is provided with a threaded hole for receiving the rod. The rod passes through the threaded hole and presses against the substrate 5. By rotating the head of the threaded member 20, the distance between the second support block 27 and the substrate 5 can be changed, thereby realizing the reciprocating movement of the second circuit board along the first direction. It is worth mentioning that in the aforementioned setting of the slideway and the slide rail, the slideway and the slide rail have a margin along the first direction. Of course, the threaded member 20 can be arranged in the matching structure of the slideway.

[0067] As described above, after the position of the first circuit board is determined, the second circuit board is loaded, and the position of the second circuit board is calibrated based on the position of the first circuit board. This can be achieved by the rotation of the second micrometer 15 driving the second support block 27 to move back and forth in the second direction, or by the rotation of the threaded member 20 driving the second support block 27 to move back and forth in the first direction, or both.

[0068] After the first circuit board is positioned and the second circuit board is aligned, the flexible circuit board needs to be positioned and adsorbed, and the flexible circuit board needs to be moved from the first position to the second position. Before the flexible circuit board is released above the first and second circuit boards, the flexible circuit board also needs to complete a fine alignment process, and its position adjustment structure and adjustment process are described in detail as follows.

[0069] See also Figure 5 As shown, the base 12 is slidably connected to the substrate 5, and the flexible circuit board adjustment structure 3 also includes a first screw micrometer 11 linked to the base 12, and the first screw micrometer 11 can be operably rotated to adjust the position of the base 12 along a second direction, and the second direction is perpendicular to the first direction. Specifically, a matching structure of a slideway and a slide rail 13 is provided between the base 12 and the substrate 5, and the slideway and the slide rail 13 move in a direction parallel to the second direction. Of course, the positions of the slide rail and the slideway can be interchanged.

[0070] The first micrometer screw 11 includes a first fixing block 31 fixed to the substrate 5 and a first adjusting rod 14 passing through the first fixing block 31, wherein the first end of the first adjusting rod 14 presses against the base 12, and the second end of the first adjusting rod 14 can be operably rotated so that the first end of the first adjusting rod 14 pushes the base 12. Through the arrangement of the first micrometer screw 11, the base 12 can drive the bracket 21 to perform fine adjustment in the reciprocating direction along the second direction, so that the pins on the flexible circuit board are accurately aligned with the corresponding pins on the first and second circuit boards.

[0071] In addition, the flexible circuit board adjustment structure 3 further includes limit blocks 10 disposed on both sides of the bracket 21. In the first position of the bracket 21, the two limit blocks 10 define the two side edges of the suction cup 22. In other words, a groove capable of accommodating the bracket 21 is formed between the two limit blocks 10. When the bracket 21 is in the first position, the two sides of the suction cup 22 form stepped surfaces with the two limit blocks 10, so that the two side edges of the flexible circuit board placed on the suction cup 22 are limited along the first direction.

[0072] In this way, after the first circuit board is positioned and the second circuit board is aligned, the flexible circuit board is placed on the suction cup 22 of the bracket 21 in the first position, and the control valve 4 is operated to make the suction cup 22 in a vacuum state and adsorb the flexible circuit board. Then, the bracket 21 is operated to rotate it around the central axis of the base 12 to the second position, and then the position of the flexible circuit board is accurately adjusted by the first micrometer 11 so that its two ends with pins are aligned with the pins of the first circuit board and the second circuit board respectively. Finally, the control valve 4 is operated to make the suction cup 22 release the flexible circuit board, and the electrical connection between the flexible circuit board and the first and second circuit boards is completed by hot pressing technology.

[0073] In summary, this embodiment also provides a method for connecting a flexible circuit board, which includes the following steps:

[0074] positioning the first circuit board;

[0075] Positioning and adjusting the second circuit board so that the second circuit board is aligned with the first circuit board along the first direction;

[0076] When the bracket 21 is in the first position, the flexible circuit board is placed, and the control valve 4 is operated to make the suction cup 22 absorb the flexible circuit board;

[0077] Moving the bracket 21 from the first position to the second position;

[0078] Adjusting the position of the base 12 so that the flexible circuit board is aligned with the first circuit board and the second circuit board along a first direction;

[0079] Operating the control valve 4 to allow the suction cup 22 to release the flexible circuit board;

[0080] The flexible circuit board is electrically connected to the first circuit board and the second circuit board by using a hot pressing technology.

[0081] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0082] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A flexible circuit board hot pressing precision alignment fixture, characterized in that: The flexible circuit board hot pressing precision alignment fixture comprises a substrate and a device connected to the substrate: A first circuit board positioning structure, used for receiving and positioning a first circuit board; A second circuit board adjustment structure, used for receiving and adjusting the position of a second circuit board so that the second circuit board is aligned with the first circuit board along a first direction; And a flexible circuit board adjustment structure, comprising a base and a bracket rotatably connected to the base, the bracket is provided with a suction cup for placing the flexible circuit board, the flexible circuit board adjustment structure also includes a control valve for controlling whether the suction cup is in a vacuum state, the bracket is operably rotated between a first position and a second position, in the first position, the suction cup adsorbs the flexible circuit board under the action of the control valve; in the second position, the suction cup is located above the first circuit board positioning structure and the second circuit board adjustment structure, the suction cup releases the flexible circuit board under the action of the control valve so that the flexible circuit board is accurately aligned with the first circuit board and the second circuit board, and the base The seat is slidably connected to the substrate, and the flexible circuit board adjustment structure also includes a first screw micrometer linked to the base, and the first screw micrometer can be operably rotated to adjust the position of the base along the second direction. Anisotropic conductive films are pre-arranged on the first and second circuit boards, and conductive pins are arranged on the relative planes of the first and second circuit boards and the flexible circuit board. After the precise alignment of the flexible circuit board and the first and second circuit boards is completed, the conductive particles in the anisotropic conductive film in the first and second circuit boards are crushed by hot pressing technology, so that the conductive pins on the flexible circuit board are electrically connected with the corresponding pins of the first and second circuit boards, and the second direction is perpendicular to the first direction.

2. The flexible circuit board hot pressing precision alignment jig according to claim 1, characterized in that: The base is arranged parallel to the first direction, and the bracket can rotate around the central axis of the base.

3. The flexible circuit board hot pressing precision alignment jig according to claim 1, characterized in that: The first micrometer screw includes a first fixed block fixed to the base plate and a first adjusting rod passing through the first fixed block, wherein the first end of the first adjusting rod presses against the base, and the second end of the first adjusting rod is operably rotated so that the first end of the first adjusting rod pushes the base.

4. The hot pressing precision alignment jig for flexible circuit boards according to claim 1, characterized in that: The flexible circuit board adjustment structure further includes limit blocks disposed on both sides of the bracket. When the bracket is in the first position, the two limit blocks define two side edges of the suction cup.

5. The hot pressing precision alignment jig for flexible circuit boards according to claim 1, characterized in that: The first circuit board positioning structure includes a first support block connected to the substrate, the first support block provides a support surface for accommodating the first circuit board, and the first support block includes at least a positioning column protruding from the support surface, and the positioning column is arranged at the center of the support surface.

6. The flexible circuit board hot pressing precision alignment jig according to claim 5, characterized in that: The first support block further includes a positioning pin, and the positioning pin is arranged between the center and the outer edge of the support surface.

7. The flexible circuit board hot pressing precision alignment jig according to claim 5, characterized in that: The first support block is also connected to two external positioning blocks, the two external positioning blocks are arranged at the outer edges of the support surface, and the connection line of the two external positioning blocks does not pass through the center of the support surface.

8. The hot pressing precision alignment jig for flexible circuit boards according to claim 1, characterized in that: The second circuit board adjustment structure includes a second support block connected to the base plate, the second support block is provided with a positioning surface for placing the second circuit board and a protruding pin extending in a direction perpendicular to the positioning surface, the second support block also includes a stopper provided on one side of the positioning surface along the first direction, and a boss provided on both sides of the positioning surface along the second direction, and the second direction is perpendicular to the first direction.

9. The hot pressing precision alignment jig for flexible circuit boards according to claim 8, characterized in that: The second support block is slidably connected to the base plate along the second direction. The second circuit board adjustment structure also includes a second micrometer screw provided on one side of the second support block along the second direction. The second micrometer screw can be operably rotated to push the second support block.

10. The hot pressing precision alignment jig for flexible circuit boards according to claim 9, characterized in that: The second micrometer screw includes a second fixed block fixed to the base plate, and the second circuit board adjustment structure also includes an elastic retaining member, one end of the elastic retaining member is connected to the second supporting block, and the other end is connected to the second fixed block.

11. The flexible circuit board hot pressing precision alignment jig according to claim 10, characterized in that: The second circuit board adjustment structure further includes a screw member arranged along the first direction, and the screw member is arranged between the second supporting block and the base plate.

12. A method for connecting a flexible circuit board, comprising the flexible circuit board hot pressing precision alignment jig according to any one of claims 1 to 11, characterized in that: The method comprises the following steps: positioning the first circuit board; Positioning and adjusting the second circuit board so that the second circuit board is aligned with the first circuit board along the first direction; When the bracket is in the first position, the flexible circuit board is placed, and the control valve is operated to make the suction cup absorb the flexible circuit board; Moving the bracket from a first position to a second position; Adjusting the position of the base so that the flexible circuit board is aligned with the first circuit board and the second circuit board along a first direction; Operating the control valve to allow the suction cup to release the flexible circuit board; The flexible circuit board is electrically connected to the first circuit board and the second circuit board by using a hot pressing technology.

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