Laser reflow soldering and pressure welding device with smoke exhaust function

Abstract

The utility model relates to the technical field of manufacturing of LED display screens, in particular to a laser reflow soldering and pressure welding device with a smoke exhaust function, which comprises a smoke exhaust air knife and a transparent cover plate, and an air inlet of the smoke exhaust air knife faces the welding position of a laser; the transparent cover plate covers the LED lamp beads on the PCB substrate, a plurality of parallel first grooves are formed in the lower side face of the transparent cover plate, a plurality of parallel second grooves are formed in the upper side face of the transparent cover plate, the sum of the depth of the first grooves and the depth of the second grooves is larger than the thickness of the transparent cover plate, and the projections of the first grooves and the second grooves on the horizontal plane intersect; according to the laser welding device, the flue capable of penetrating through the glass cover plate is arranged, smoke and heat can be sucked away in time in the welding process through the smoke exhaust air knives on the two sides of the laser, the uniformity of the temperature of a welding area is guaranteed, and the straight edges between the grooves can serve as pressing connection edges of LED lamp beads, so that the positions of the LED lamp beads can be kept stable in the laser welding process.

Description

Technical Field

[0001] The utility model relates to the technical field of manufacturing LED display screens, in particular to a laser reflow welding and pressure welding device with a smoke exhaust function. Background Art

[0002] At present, in the production process of Mini & Micro LED display products, the welding process is an important link in assembling LED lamp beads onto the PCB substrate. In the traditional welding process, hot air nitrogen reflow soldering is mostly used. Although this method can achieve welding, there are multiple problems. First of all, this type of welding process has high energy consumption and consumes a large amount of nitrogen. At the same time, heating the PCB substrate as a whole may cause the substrate to expand and contract with heat. This physical deformation may cause the PCB to warp. The warped PCB will affect the uniformity of the display screen, especially the brightness and color difference between the middle and edge parts will be inconsistent. In addition, the warping of the PCB may also interfere with the subsequent cutting accuracy, resulting in large seams and step differences between substrates when the product is spliced, thereby affecting the delivery quality of the final product.

[0003] In order to solve the above problems, the industry has also adopted the laser reflow soldering method, which uses the high energy density of laser for welding. In the process of laser reflow soldering, in order to prevent the LED lamp beads from tilting, a pressure welding method is usually adopted, that is, a layer of glass cover is covered during welding. However, during the laser welding process, organic components such as flux in the solder paste cannot be discharged in time, which will produce smoke and some organic compounds in the welding area. These substances will not only affect the welding effect of the laser, but the adhesion of organic compounds will contaminate the surface of the LED lamp beads and affect their optical properties. In some cases, volatile organic matter may also cause the LED lamp beads to fall off the glass cover. In addition, due to the uneven accumulation of heat caused by smoke, the welding effect of the edge and the middle of the product may be different, affecting the welding quality.

[0004] Therefore, developing a new welding technology to solve the above problems is of great significance to improving product quality and production efficiency. Utility Model Content

[0005] In order to solve the above problems, the utility model aims to provide a laser reflow soldering device with a smoke exhaust function to improve the soldering quality of LED lamp beads.

[0006] The utility model is realized by the following technical solutions:

[0007] A laser reflow welding device with a smoke exhaust function, comprising:

[0008] A smoke exhaust air knife is arranged on the side of the laser, and the air inlet of the smoke exhaust air knife faces the welding position of the laser;

[0009] A transparent cover plate, which presses the LED lamp beads onto the PCB substrate, wherein the lower side of the transparent cover plate is provided with a plurality of parallel first grooves, and the upper side of the transparent cover plate is provided with a plurality of parallel second grooves, the sum of the depth of the first grooves and the depth of the second grooves is greater than the thickness of the transparent cover plate, and the projections of the first grooves and the second grooves on the horizontal plane intersect.

[0010] Optionally, the width of the first groove is smaller than the width of the LED lamp bead.

[0011] Optionally, the distance between two adjacent first grooves is equal to the distance between two adjacent columns of the LED lamp beads, and the straight edge between two adjacent first grooves is pressed onto the LED lamp beads in the corresponding column.

[0012] Optionally, the depth of the first groove is greater than 1 / 2 of the thickness of the transparent cover plate, and the depth of the second groove is greater than 1 / 2 of the thickness of the transparent cover plate.

[0013] Optionally, an angle between the first groove and the second groove is 90°.

[0014] Furthermore, the welding device further comprises a cover plate fixing structure, the inner side surface of the cover plate fixing structure is provided with fixing grooves, and the two ends of the transparent cover plate are respectively arranged in the two fixing grooves of the cover plate fixing structure.

[0015] Optionally, the two cover plate fixing structures are located at two ends of the second groove.

[0016] Optionally, the number of the smoke exhaust air knives is two, and the two smoke exhaust air knives are respectively arranged on both sides of the laser.

[0017] Optionally, the first groove and the second groove are processed by a wafer dicing machine.

[0018] Optionally, the transparent cover plate is a K9 glass plate.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] The utility model utilizes a plurality of first grooves and a second groove to form a flue that can penetrate the glass cover plate, and through the smoke exhaust air knives on both sides of the laser, smoke and heat can be promptly extracted during the welding process to ensure the uniformity of the temperature in the welding area, and the straight edges between the grooves can be used as the crimping edges of the LED lamp beads, so that the LED lamp beads can maintain a stable position during the laser welding process, thereby improving the welding accuracy.

[0021] The utility model can quickly extract smoke and organic compounds generated during welding through the designed flue, and the heat discharged synchronously can prevent overheating, ensure uniform temperature in the welding area, and improve welding quality.

[0022] The utility model utilizes the edge marked on the cover plate as the crimping edge of the LED, which can effectively crimp the LED lamp bead in the correct position, avoid the LED position deviation caused by high temperature, ensure the positioning accuracy of the LED after welding, and thus improve the display consistency and quality of the product.

[0023] The utility model can timely discharge smoke and dust, avoid adhesion on the surface of LED lamp beads, prevent the optical effect from decreasing due to pollution, and maintain the cleanliness and brightness of LED lamp beads. At the same time, since the smoke and dust are discharged in time, the laser light path remains clear and undisturbed, thereby ensuring the effect of laser welding and improving the welding success rate and product pass rate.

[0024] Finally, the utility model increases the strength of the transparent cover plate through the cover plate fixing structure design, avoids the damage of the cover plate caused by lateral force, and ensures the structural stability of the cover plate during the pressure welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification and do not constitute a limitation on the embodiments of the present invention.

[0026] Figure 1 It is a working schematic diagram of a laser reflow welding and pressure welding device with a smoke exhaust function according to the utility model.

[0027] Figure 2 It is a schematic diagram of the crimping of the glass cover plate according to the utility model.

[0028] Figure 3 It is a structural schematic diagram of the glass cover plate according to the utility model.

[0029] Figure numerals: 1-laser, 2-smoke exhaust air knife, 3-transparent cover, 4-cover fixing structure, 5-PCB substrate, 6-LED lamp bead, 7-first groove, 8-second groove. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and implementation methods. It is understood that the specific implementation methods described here are only used to explain the relevant content, rather than to limit the utility model.

[0031] It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] Embodiment 1

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, a laser reflow welding device with smoke exhaust function includes: a smoke exhaust air knife 2 and a transparent cover plate 3.

[0037] The smoke exhaust air knife 2 is arranged on the side of the laser 1, and the air inlet of the smoke exhaust air knife 2 faces the welding point of the laser 1; the transparent cover plate 3 presses the LED lamp beads 6 onto the PCB substrate 5, and the lower side of the transparent cover plate 3 is provided with a plurality of parallel first grooves 7, and the upper side of the transparent cover plate 3 is provided with a plurality of parallel second grooves 8, the sum of the depth of the first groove 7 and the depth of the second groove 8 is greater than the thickness of the transparent cover plate 3, and the projections of the first groove 7 and the second groove 8 on the horizontal plane intersect.

[0038] The exhaust air knife 2 is used to remove smoke and gas during the laser welding process. It is installed on the side of the laser 1, so that the smoke generated during the welding process can be more effectively captured. The air inlet of the air knife faces the welding part of the laser 1, so that the smoke generated during the laser welding of the LED lamp beads 6 and the PCB substrate 5 can be directly sucked away. The exhaust air knife 2 usually uses a strong wind flow to quickly remove the smoke in the welding area, and also helps cool the area to prevent overheating.

[0039] The transparent cover plate 3 is used to press the LED lamp beads 6 during the laser welding process to keep their position stable. The cover plate is made of transparent material, such as K9 glass, which not only allows the operator to clearly see the welding point, but also allows the laser to pass through. A plurality of parallel first grooves 7 and second grooves 8 are respectively provided on the lower side and the upper side of the transparent cover plate 3. The sum of the depths of the first grooves 7 and the second grooves 8 exceeds the thickness of the body of the transparent cover plate 3, which means that the grooves can penetrate each other to form channels. The function of these channels is to allow smoke to be quickly discharged through these grooves during the laser welding process.

[0040] The projections of the first groove 7 and the second groove 8 on the horizontal plane intersect, indicating that the grooves are staggered, that is, the flue is allowed to form a complex network in the cover plate, so that smoke can be discharged smoothly from any position. This design not only ensures the effective discharge of smoke, but also maintains the structural strength of the transparent cover plate 3.

[0041] When the laser reflow soldering device is working, the laser 1 will emit laser to heat the soldering points on the LED lamp bead 6 and the PCB substrate 5 to achieve soldering. In this process, the first groove 7 on the cover plate plays a role in keeping the position of the LED lamp bead 6 stable, and the flue formed by the groove effectively removes the smoke and excess heat generated during the welding process. At the same time, the smoke exhaust air knife 2 quickly sucks out the smoke through strong wind, keeps the welding environment clean and helps control the temperature of the welding area.

[0042] In order to better absorb heat from smoking, the number of smoke exhaust air knives 2 is set to two, and the two smoke exhaust air knives 2 are respectively arranged on both sides of the laser 1.

[0043] The transparent cover plate 3 is a K9 glass plate. K9 glass has the characteristics of excellent light transmittance and refractive effect as well as high hardness and texture. It is usually used as a base material for laser films to improve the characteristics and ability of resisting laser damage, especially in high-power laser applications such as laser anti-reflection films and polarization films.

[0044] In order to fix the LED lamp beads 6, that is, the straight edges between the first grooves 7 can exert a downward force on the LED lamp beads 6, the width of the first grooves 7 is set to be smaller than the width of the LED lamp beads 6. Because the grooves are narrow, a part of each LED lamp bead 6 can be squeezed by the straight edges and will not fall into the grooves, which can reduce the position deviation or tilt of the LED lamp bead 6 caused by excessive temperature during welding, thereby maintaining welding accuracy.

[0045] A better option is to set the distance between two adjacent first grooves 7 to be equal to the distance between two adjacent columns of LED lamp beads 6, and the straight edges between two adjacent first grooves 7 are pressed onto the LED lamp beads 6 of the corresponding column. This can achieve the effect that each column of LED lamp beads 6 closely corresponds to a groove. On this basis, the straight edges are pressed onto the LED lamp beads 6 of the corresponding column, that is, the raised portions (straight edges) between the grooves of the transparent cover plate 3 are used to apply pressure to the LED lamp beads 6, so that the position of the LED lamp beads 6 can be more accurately controlled, while ensuring the uniformity during pressure welding. Because of the effect of these raised portions, the LED lamp beads 6 are subjected to stable pressure throughout the welding process, which can effectively prevent the displacement or tilt of the LED caused by welding.

[0046] An embodiment of the groove is provided, that is, the depth of the first groove 7 is greater than 1 / 2 of the thickness of the transparent cover plate 3, and the depth of the second groove 8 is greater than 1 / 2 of the thickness of the transparent cover plate 3. The depths of the first groove 7 and the second groove 8 are both greater than half of the thickness of the transparent cover plate 3, which can ensure that the grooves can penetrate each other to form an effective flue. The flue allows smoke and gas to flow inside the cover plate and be quickly discharged without accumulating in the welding area. Avoid interference with the laser during welding, prevent smoke from depositing on the surface of the LED lamp bead 6, and maintain uniformity of welding temperature.

[0047] The angle between the first groove 7 and the second groove 8 is 90°, which can maximize the distribution of the flue gas passage formed by the grooves in the cover plate, thereby increasing the efficiency of smoke exhaust. The vertical cross design can not only form a more uniform smoke exhaust network, but also help to enhance the overall stability and strength of the transparent cover plate 3 in terms of structure. Compared with other arrangements, the vertical cross arrangement can better disperse the stress caused by thermal expansion or mechanical pressure.

[0048] The first groove 7 and the second groove 8 are processed by a wafer dicing machine (a wafer dicing machine can open a groove of at least 13 um). A wafer dicing machine is a device used to cut silicon wafers in semiconductor manufacturing, which can accurately draw tiny grooves on hard materials, ensuring the accuracy and regularity of the grooves.

[0049] Embodiment 2

[0050] like Figure 1As shown, the welding device further comprises a cover plate fixing structure, the inner side surface of the cover plate fixing structure 4 is provided with a fixing groove, and the two ends of the transparent cover plate 3 are respectively arranged in the fixing grooves of the two cover plate fixing structures 4 .

[0051] The cover plate fixing structure can stabilize the position of the transparent cover plate 3 during the welding process and provide sufficient strength to prevent possible damage due to pressure or thermal expansion.

[0052] The two cover plate fixing structures are located at both ends of the second groove 8, which is conducive to distributing the force in the welding process more evenly on the transparent cover plate 3. When the force acts on the cover plate through the fixing mechanism, the force can be effectively dispersed to avoid local excessive pressure on the transparent cover plate 3, thereby increasing the strength and durability of the cover plate.

[0053] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above utility model, and these changes or modifications are still within the scope of the present utility model.

Claims

1. A laser reflow welding device with fume exhaust function, characterized in that: include: A smoke exhaust air knife (2) is arranged on the side of the laser (1), and the air inlet of the smoke exhaust air knife (2) faces the welding position of the laser (1); A transparent cover plate (3) is used to press an LED lamp bead (6) onto a PCB substrate (5); a plurality of parallel first grooves (7) are arranged on the lower side of the transparent cover plate (3); a plurality of parallel second grooves (8) are arranged on the upper side of the transparent cover plate (3); the sum of the depths of the first grooves (7) and the second grooves (8) is greater than the thickness of the transparent cover plate (3); and the projections of the first grooves (7) and the second grooves (8) on a horizontal plane intersect.

2. The laser reflow welding device with smoke exhaust function according to claim 1, characterized in that: The width of the first groove (7) is smaller than the width of the LED lamp bead (6).

3. The laser reflow welding device with fume exhaust function according to claim 1, characterized in that: The distance between two adjacent first grooves (7) is equal to the distance between two adjacent columns of the LED lamp beads (6), and the straight edge between the two adjacent first grooves (7) is pressed onto the LED lamp beads (6) in the corresponding column.

4. The laser reflow welding device with smoke exhaust function according to claim 1, characterized in that: The depth of the first groove (7) is greater than 1 / 2 of the thickness of the transparent cover plate (3), and the depth of the second groove (8) is greater than 1 / 2 of the thickness of the transparent cover plate (3).

5. The laser reflow welding device with smoke exhaust function according to claim 1, characterized in that: The angle between the first groove (7) and the second groove (8) is 90°.

6. The laser reflow welding device with smoke exhaust function according to claim 1, characterized in that: It also comprises a cover plate fixing structure, the inner side surface of the cover plate fixing structure (4) is provided with a fixing groove, and the two ends of the transparent cover plate (3) are respectively arranged in the fixing grooves of the two cover plate fixing structures (4).

7. The laser reflow welding device with smoke exhaust function according to claim 6, characterized in that: The two cover plate fixing structures are located at two ends of the second groove (8).

8. The laser reflow welding device with smoke exhaust function according to claim 1, characterized in that: The number of the smoke exhaust air knives (2) is two, and the two smoke exhaust air knives (2) are respectively arranged on both sides of the laser (1).

9. The laser reflow welding device with smoke exhaust function according to claim 1, characterized in that: The first groove (7) and the second groove (8) are processed by a wafer dicing machine.

10. The laser reflow welding device with smoke exhaust function according to claim 1, characterized in that: The transparent cover plate (3) is a K9 glass plate.

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