An efficient and stable tin printing system for Mini LED production

Abstract

The present invention discloses an efficient and stable tin printing system for MiniLED production, including a printing machine, which includes a base, a support table capable of carrying a substrate is arranged on the top of the base, a steel mesh clamp seat is rotatably arranged on the base, a steel mesh template is arranged on the side of the steel mesh clamp seat away from the base, the steel mesh template has mesh holes through which solder paste can pass, a synchronous plate capable of moving in the extension direction of the steel mesh clamp seat is arranged on the side of the steel mesh clamp seat close to the base, and the synchronous plate is perpendicular to the extension direction of the steel mesh clamp seat; a cleaning device is arranged on the side of the synchronous plate facing the bottom of the steel mesh clamp seat, the cleaning device is driven by the movement of the synchronous plate, and can remove solder paste residues in the mesh holes, the present invention arranges a synchronous plate on one side of the bottom of the steel mesh clamp seat, after printing is completed, it only needs to move the synchronous plate back and forth in the extension direction of the steel mesh clamp seat, and the cleaning device can be used to efficiently remove solder paste residues in the mesh holes, which is convenient, labor-saving and reliable.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor technology, and in particular to an efficient and stable tin printing system for Mini LED production. Background Art

[0002] Mini LED's tin printing system is a device used to produce Mini LED devices. It is mainly used to print solder paste on the metal substrate of Mini LED chips to form electrodes. This tin printing process is a very critical step in Mini LED production and one of the main differences between Mini LED and traditional LED.

[0003] The tin printing system usually includes equipment such as a printer, an oven, and a cleaning machine. In the printer, solder paste is accurately printed on the metal substrate by using a specific printing head and a printing template to form an electrode; then, it is baked and cured in an oven to firmly bond the solder paste to the metal substrate; finally, impurities remaining in the printing process are cleaned in a cleaning machine.

[0004] Therefore, the design and performance of the tin printing system have an important impact on the manufacturing quality and production efficiency of Mini LED.

[0005] In order to improve the manufacturing quality of Mini LED, a Chinese invention patent with announcement number CN113650404B discloses a solder paste printing device for mini-LED and a preparation process of mini-LED. The device includes a body, a support column is provided on one side of the body, and a steel mesh clamp for mounting a steel mesh template is rotatably provided on the support column. A support platform is provided on the body, and a support member for positioning the substrate is provided on the support platform. An elastic strip is wound around the outer wall of the rotating roller, and an operating rod is provided at one end of the elastic strip. A positioning part for positioning the operating rod is provided at the end of the support platform away from the rotating roller, and when the operating rod is positioned at the end of the support platform away from the rotating roller, the elastic strip can cover the surface of the support platform; the preparation process mainly includes selecting a substrate, brushing solder paste, solid crystal, and then reflow soldering. This application has the effect of facilitating the cleaning of the solder paste in the pores of the steel mesh template to avoid the residual solder paste in the pores affecting the quality of the mini-LED products produced next time.

[0006] However, there are certain defects in the above patent technology, namely: only by rotating the steel mesh template to press the elastic strip, the deformed part of the elastic strip extends into the pores of the steel mesh template to squeeze out the solder paste. In this way, the deformed part of the elastic strip needs to be fully extended into the pores to completely push the residual solder paste in the pores out of the pores. However, the downward pressure applied to the steel mesh clamp in this process is relatively large, which is not only laborious to operate, but also easy to cause deformation and damage of the steel mesh template, affecting the subsequent MiniLED production process. Summary of the invention

[0007] In order to solve the technical problems mentioned in the above background technology, the present invention provides an efficient and stable tin printing system for Mini LED production.

[0008] The present invention is implemented by the following technical solution: an efficient and stable tin printing system for Mini LED production, including a printer, an oven, and a cleaning machine. The printer is used to print solder paste on a substrate to form an electrode, the oven is used to bake and solidify the formed electrode, and the cleaning machine is used to remove residual impurities on the substrate.

[0009] The printer comprises a base, a support platform capable of carrying the substrate is arranged on the top of the base, a steel mesh clamp seat is rotatably arranged on the base, a steel mesh template is arranged on the side of the steel mesh clamp seat away from the base, and the steel mesh template has mesh holes capable of transmitting solder paste.

[0010] A synchronization plate that can move in the extension direction of the steel mesh clamp seat is arranged on one side of the steel mesh clamp seat close to the base, and the synchronization plate is perpendicular to the extension direction of the steel mesh clamp seat; a cleaning device is arranged on the side of the synchronization plate facing the bottom of the steel mesh clamp seat, and the cleaning device is driven by the movement of the synchronization plate to remove the solder paste residue in the mesh hole.

[0011] As a further improvement of the above scheme, the cleaning device includes at least one disk, which is arranged on the side of the synchronous plate facing the steel mesh template, and a first brush head that contacts and cooperates with the mesh is arranged on the top of the disk. A transmission mechanism is arranged on the synchronous plate, and the transmission mechanism is driven by the movement of the synchronous plate. It can not only drive the disk to reciprocate in its circumferential direction, but also synchronously drive the first brush head on the disk to intermittently squeeze the mesh on the steel mesh template.

[0012] As a further improvement of the above scheme, two track grooves parallel to the extension direction of the steel mesh clamp seat are relatively opened on the steel mesh clamp seat located on both sides of the steel mesh template, and track blocks are slidably connected in the two track grooves. The two ends of the synchronization plate are respectively fixed on the opposite side walls of the two track blocks.

[0013] As a further improvement of the above scheme, two touch pressure plates parallel to the track groove are relatively arranged on the two side walls of the steel mesh clamp seat, and the synchronization plate and the two track blocks are jointly rotated with a synchronization shaft inserted therein, and both ends of the synchronization shaft are provided with a first roller that contacts and cooperates with the corresponding touch pressure plate, and the outer side of the synchronization shaft is connected to the input end of the transmission mechanism.

[0014] As a further improvement of the above scheme, the transmission mechanism includes a cam accommodated inside the synchronization plate, the cam is sleeved and fixed on the outer wall of the synchronization shaft, and a cylinder is inserted and rotated on the synchronization plate facing the steel mesh clamp seat, and a first groove is opened at one end of the cylinder close to the synchronization shaft, a pressure rod is inserted in the first groove, a first limit block is fixed on the outer wall of the pressure rod, and a first limit groove is spirally opened on the inner wall of the first groove to engage with the first limit block, a pressure block is provided at one end of the pressure rod to be extruded and engaged with the cam after contact, and a second groove is opened at the other end of the cylinder, and a first connecting rod that can move along the extension direction of its groove body is slidably clamped in the second groove, and one end of the first connecting rod is fixed at the center of the corresponding disk body.

[0015] As a further improvement of the above solution, a second connecting rod is coaxially arranged at the other end of the first connecting rod and can rotate relative to it. One end of the second connecting rod penetrates into the first groove and is fixedly connected to the end surface of the pressure rod.

[0016] As a further improvement of the above solution, a first spring is sleeved on the outer side of the pressure-bearing rod, and two ends of the first spring are respectively fixed to the side wall of the pressure-bearing block and the corresponding side wall inside the synchronous plate.

[0017] As a further improvement of the above scheme, a plurality of radial grooves are radially opened on the disk body, a moving block is slidably connected in the radial groove, a second spring is arranged between the centrifugal side of the moving block and the inner wall of the centrifugal side of the radial groove, and a second brush head is arranged on the top of the moving block.

[0018] As a further improvement of the above solution, a support block is provided on the base, and a clamping rod is elastically inserted on the support block and is clamped and matched with the synchronization shaft after contacting.

[0019] As a further improvement of the above solution, the clamping rod is in a U-shaped structure.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The efficient and stable tin printing system for Mini LED production of the present invention sets a synchronization plate on one side of the bottom of the steel mesh clamp. After printing is completed, it is only necessary to move the synchronization plate back and forth in the extension direction of the steel mesh clamp without applying additional downward pressure to the steel mesh clamp. The cleaning device can be used to efficiently remove the solder paste residue in the mesh pores, which is convenient, labor-saving and reliable, and ensures that it affects the subsequent Mini LED production process.

[0022] 2. The efficient and stable tin printing system for Mini LED production of the present invention can synchronously realize the circumferential reciprocating rotation of the first brush head whenever the synchronization plate moves to improve the cleaning effect of the pores, the first brush head intermittently and reciprocatingly squeezes the mesh so that the bristles extend into the mesh to push out the residual solder paste residue to avoid residue, the second brush head radially reciprocates on the disk surface to increase the cleaning area of ​​the steel mesh template, and the second brush head itself reciprocates circumferentially to improve the cleaning effect of the mesh. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure of the present invention as a whole in another state;

[0025] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the steel mesh clamp seat;

[0026] Figure 4 for Figure 2 Schematic diagram of the top view of the steel mesh clamp after rotating 90 degrees;

[0027] Figure 5 for Figure 2 The side view structural diagram of the central synchronization board and other components;

[0028] Figure 6 for Figure 5 Schematic diagram of the partial cross-section structure inside the synchronization board;

[0029] Figure 7 for Figure 6 The enlarged structural diagram at A in the middle;

[0030] Figure 8 for Figure 6 Schematic diagram of the cross-sectional structure of the moving block in the top view.

[0031] Description of main symbols:

[0032] 1. Base; 2. Support table; 3. Steel mesh clamp seat; 4. Steel mesh template; 5. Mesh; 6. Track groove; 7. Track block; 8. Synchronous plate; 10. Synchronous shaft; 11. First roller; 12. Support block; 13. Clamping rod; 14. Touch plate; 15. Cam; 16. Cylinder; 17. First groove; 18. Pressure rod; 19. First limiting groove; 20. First limiting block; 21. Second groove; 22. First connecting rod; 23. Disc; 24. First brush head; 25. Second brush head; 26. Radial groove; 27. Moving block; 29. ​​Pressure block; 30. Second connecting rod; 31. Second roller; 32. First gear; 33. Second gear; 34. Third connecting rod. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0034] Example 1

[0035] Please combine Figures 1 to 7 , an efficient and stable tin printing system for Mini LED production, including a printer, an oven, and a cleaning machine. The printer is used to print solder paste on the substrate to form electrodes, the oven is used to bake and solidify the formed electrodes, and the cleaning machine is used to remove residual impurities on the substrate to ensure the quality of the Mini LED products produced.

[0036] The printer includes a base 1, a support table 2 for carrying a substrate is arranged on the top of the base 1, a steel mesh clamp seat 3 is rotatably arranged on the base 1, a steel mesh template 4 is arranged on the side of the steel mesh clamp seat 3 away from the base 1, and a mesh hole 5 through which solder paste can pass is arranged on the steel mesh template 4.

[0037] In order to facilitate the removal of the solder paste remaining in the pores of the mesh 5 after printing, a synchronous plate 8 that can move in the extension direction of the steel mesh clamp 3 is provided on the side of the steel mesh clamp 3 close to the base 1 in this embodiment, and the synchronous plate 8 is perpendicular to the extension direction of the steel mesh clamp 3. The synchronous plate 8 has a cleaning device on the side facing the bottom of the steel mesh clamp 3, and the cleaning device is driven by the movement of the synchronous plate 8, that is, by driving the synchronous plate 8 to move back and forth in the extension direction of the steel mesh clamp 3, the residual solder paste in the mesh 5 can be removed.

[0038] The cleaning device includes at least one disc 23. In this embodiment, a plurality of discs 23 can be evenly arranged along the width direction of the bottom of the steel mesh clamp seat 3. The disc 23 is arranged on the side of the synchronous plate 8 facing the steel mesh template 4. A first brush head 24 that contacts and cooperates with the mesh 5 is arranged on the top of the disc 23. The synchronous plate 8 is provided with a transmission mechanism. The transmission mechanism is driven by the movement of the synchronous plate 8, which can not only drive the disc 23 to reciprocate in its circumferential direction to improve the cleaning effect of the bottom of the steel mesh template 4, but also synchronously drive the first brush head 24 on the disc 23 to intermittently squeeze the mesh 5 on the steel mesh template 4, so that the solder paste remaining in the mesh 5 is ejected to avoid residue.

[0039] Two track grooves 6 parallel to the extension direction of the steel mesh clamping seat 3 are relatively opened on the steel mesh clamping seat 3 located on both sides of the steel mesh template 4, and track blocks 7 are slidably connected in the two track grooves 6. The two ends of the synchronization plate 8 are respectively fixed on the opposite side walls of the two track blocks 7 to realize the movement of the synchronization plate 8 at the bottom of the steel mesh template 4.

[0040] Two touch plates 14 parallel to the track groove 6 are arranged on the two side walls of the steel mesh clamp seat 3. The synchronization plate 8 and the two track blocks 7 rotate together and are inserted with a synchronization shaft 10. Both ends of the synchronization shaft 10 are provided with first rollers 11 that contact and cooperate with the corresponding touch plates 14. The outer side of the synchronization shaft 10 is connected to the input end of the transmission mechanism.

[0041] The transmission mechanism includes a cam 15 accommodated in the interior of the synchronous plate 8, the cam 15 is sleeved and fixed on the outer wall of the synchronous shaft 10, and a cylinder 16 is inserted and rotated on the synchronous plate 8 facing the steel mesh clamp seat 3. A first groove 17 is opened at one end of the cylinder 16 close to the synchronous shaft 10, and a pressure rod 18 is inserted in the first groove 17. A first limit block 20 is fixed on the outer wall of the pressure rod 18, and a first limit groove 19 that is engaged with the first limit block 20 is spirally opened on the inner wall of the first groove 17. A pressure block 29 that is squeezed and engaged with the cam 15 is provided at one end of the pressure rod 18. A second groove 21 is opened at the other end of the cylinder 16, and a first connecting rod 22 that can move along the extension direction of its groove body is slidably clamped in the second groove 21, and one end of the first connecting rod 22 is fixed at the center of the corresponding disk body 23.

[0042] A second connecting rod 30 is coaxially disposed at the other end of the first connecting rod 22 and can rotate relative to the first connecting rod 22 . One end of the second connecting rod 30 penetrates into the first groove 17 and is fixed to the end surface of the pressure-bearing rod 18 .

[0043] A first spring is sleeved on the outside of the pressure rod 18, and both ends of the first spring are respectively fixed to the side wall of the pressure block 29 and the corresponding side wall inside the synchronous plate 8. The first spring can help the pressure rod 18 to quickly return to its initial position after being impacted by the cam 15 each time.

[0044] A plurality of radial grooves 26 are radially provided on the disk body 23, and a moving block 27 is slidably connected in the radial groove 26. A second spring is arranged between the centrifugal side of the moving block 27 and the inner wall of the centrifugal side of the radial groove 26, and a second brush head 25 is arranged on the top of the moving block 27. When the disk body 23 rotates, the moving block 27 will move centrifugally in the radial groove 26, which will drive the second brush head 25 to move synchronously. When the rotation speed of the disk body 23 gradually decreases, the moving block 27 will move centripetally in the radial groove 26 under the action of the second spring, and so on and so forth, thereby realizing the radial reciprocating movement of the second brush head 25 on the disk surface of the disk body 23, so as to increase the number of mesh holes on the steel mesh template 4 to be cleaned and improve the cleaning efficiency.

[0045] A support block 12 is provided on the base 1, and one end of the steel mesh clamp seat 3 when it is closed can be supported by the support block 12.

[0046] The support block 12 is elastically inserted with a clamping rod 13 that engages with the synchronization shaft 10. The clamping rod 13 is in a U-shaped structure. Whenever the steel mesh clamp seat 3 is closed, the synchronization plate 8 is moved to the outside of the support block 12, and the clamping rod 13 is temporarily pressed to align the U-shaped opening of the clamping rod 13 with the synchronization shaft 10 and then released, so that the U-shaped opening of the clamping rod 13 clamps the synchronization shaft 10, so as to achieve the stable maintenance of the steel mesh clamp seat 3 in the closed state, which is convenient and reliable.

[0047] The working principle of this embodiment:

[0048] After each printing is completed, the first roller 11 can be driven to rotate by moving the synchronization plate 8 in the extension direction of the steel mesh clamp seat 3. The rotation of the first roller 11 can drive the synchronization shaft 10 and multiple cams 15 to rotate synchronously. When the cam 15 rotates and contacts the extrusion pressure block 29, it will drive the pressure rod 18 to move into the first groove 17 (the first spring is gradually compressed and deformed). Since the first limiting groove 19 is spiral, the pressure rod 18 can squeeze and rub the groove wall of the first limiting groove 19 through the first limiting block 20, forcing the cylinder 16 to rotate as a whole. The rotation of the cylinder 16 will drive the first connecting rod 22 to rotate synchronously through the second groove 21. When the cam 15 is separated from the pressure block 29, the elastic force of the first spring is released to drive the pressure block 29 and the pressure rod 18 to move in the opposite direction to the initial position, which will cause the cylinder 16 to drive the first connecting rod 22 to rotate in the opposite direction synchronously through the second groove 21. As the synchronous shaft 10 rotates, this process is repeated continuously, so that the first connecting rod 22 drives the disc body 23 and the first brush head 24 to rotate reciprocatingly in the circumferential direction, thereby improving the cleaning effect.

[0049] In addition, when the pressure rod 18 moves relative to the first groove 17, the second connecting rod 30 can drive the first connecting rod 22 to move synchronously, so that the first connecting rod 22 can move axially relative to the second groove 21, and then the first connecting rod 22 drives the disk body 23 and the first brush head 24, so that the first brush head 24 intermittently squeezes the mesh 5, so that the bristles extend into the mesh 5 to push out the remaining solder paste residue to avoid residue.

[0050] In addition, when the disk body 23 rotates, the moving block 27 will move centrifugally in the radial groove 26, which will drive the second brush head 25 to move synchronously. When the rotation speed of the disk body 23 gradually decreases, the moving block 27 will move centripetally in the radial groove 26 under the action of the second spring, and so on. The second brush head 25 can move radially back and forth on the disk surface of the disk body 23, thereby increasing the cleaning area of ​​the steel mesh template 4 and the number of meshes 5 cleaned. In addition, with the combined action of the reciprocating rotation of the disk body 23 and the axial reciprocating extension and contraction of the disk body 23, the cleaning effect of the mesh can be greatly improved.

[0051] Example 2

[0052] Please combine Figure 8 This embodiment is an improved solution of Embodiment 1. A second roller 31 is rotatably provided in the moving block 27. Part of the wheel body of the second roller 31 protrudes to the outside of the moving block 27 and contacts the inner wall of the radial groove 26. A first gear 32 is coaxially fixed to the second roller 31. A second gear 33 meshing with the first gear 32 is installed inside the moving block 27. A third connecting rod 34 is coaxially inserted into the second gear 33. One end of the third connecting rod 34 is fixed to the center of the second brush head 25.

[0053] The working principle of this embodiment is:

[0054] Whenever the moving block 27 reciprocates in the radial groove 26 , it drives the second roller 31 , the first gear 32 , the second gear 33 , the third connecting rod 34 and the second brush head 25 to reciprocate in the circumferential direction, so as to improve the cleaning effect on the mesh 5 .

[0055] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An efficient and stable tin printing system for Mini LED production, characterized in that: The invention comprises a printer, an oven and a cleaning machine. The printer is used to print solder paste on a substrate to form an electrode. The oven is used to bake and solidify the formed electrode. The cleaning machine is used to remove residual impurities on the substrate. The printer comprises a base, a support platform capable of carrying the substrate is arranged on the top of the base, a steel mesh clamp seat is rotatably arranged on the base, a steel mesh template is arranged on the side of the steel mesh clamp seat away from the base, and the steel mesh template has mesh holes capable of transmitting solder paste. A synchronous plate that can move in the extension direction of the steel mesh clamp seat is arranged on one side of the steel mesh clamp seat close to the base, and the synchronous plate is perpendicular to the extension direction of the steel mesh clamp seat; a cleaning device is arranged on one side of the synchronous plate facing the bottom of the steel mesh clamp seat, and the cleaning device is driven by the movement of the synchronous plate to remove the solder paste residue in the mesh hole; The cleaning device comprises at least one disc, the disc is arranged on the side of the synchronous plate facing the steel mesh template, a first brush head in contact with the mesh is arranged on the top of the disc, a transmission mechanism is arranged on the synchronous plate, the transmission mechanism is driven by the movement of the synchronous plate, and can not only drive the disc to reciprocate in its circumferential direction, but also synchronously drive the first brush head on the disc to intermittently squeeze the mesh on the steel mesh template; Two track grooves parallel to the extension direction of the steel mesh clamping seat are relatively opened on the steel mesh clamping seat located on both sides of the steel mesh template, and track blocks are slidably connected in the two track grooves, and the two ends of the synchronization plate are respectively fixed on the opposite side walls of the two track blocks; Two touch-pressure plates parallel to the track groove are arranged on the two side walls of the steel mesh clamp seat, and a synchronous shaft is inserted to rotate with the synchronous plate and the two track blocks together, and first rollers contacting and cooperating with the corresponding touch-pressure plates are arranged at both ends of the synchronous shaft, and the outer side of the synchronous shaft is connected to the input end of the transmission mechanism; The transmission mechanism comprises a cam accommodated in the interior of the synchronous plate, the cam is sleeved and fixed on the outer side wall of the synchronous shaft, the synchronous plate is rotatably inserted with a cylinder facing the side of the steel mesh clamp seat, the cylinder is provided with a first groove at one end close to the synchronous shaft, a pressure-bearing rod is inserted in the first groove, a first limiting block is fixed on the outer side wall of the pressure-bearing rod, a first limiting groove which is screwed and matched with the first limiting block is spirally provided on the inner side wall of the first groove, one end of the pressure-bearing rod is provided with a pressure-bearing block which is squeezed and matched with the cam after contacting, and the cylinder is provided with a second groove at the other end, a first connecting rod which can move along the extension direction of its groove body is slidably clamped in the second groove, and one end of the first connecting rod is fixed at the center of the corresponding disk body; The disc body is radially provided with a plurality of radial grooves, a moving block is slidably connected in the radial groove, a second spring is arranged between the centrifugal side of the moving block and the inner wall of the centrifugal side of the radial groove, and a second brush head is arranged on the top of the moving block.

2. The efficient and stable tin printing system for Mini LED production as claimed in claim 1, characterized in that: A second connecting rod is coaxially arranged at the other end of the first connecting rod and can rotate relative to the first connecting rod. One end of the second connecting rod penetrates into the first groove and is fixedly connected to the end surface of the pressure-bearing rod.

3. The efficient and stable tin printing system for Mini LED production as claimed in claim 1, characterized in that: A first spring is sleeved on the outer side of the pressure-bearing rod, and two ends of the first spring are respectively fixed to the side wall of the pressure-bearing block and the corresponding side wall inside the synchronous plate.

4. The efficient and stable tin printing system for Mini LED production as claimed in claim 1, characterized in that: A support block is arranged on the base, and a clamping rod which is in contact with the synchronizing shaft and is clamped and matched is elastically inserted on the support block.

5. The efficient and stable tin printing system for Mini LED production as claimed in claim 4, characterized in that: The clamping rod is in a U-shaped structure.

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