Universal rear film pasting jig and film pasting method for plastic package QFN and DFN products

Abstract

The invention relates to a universal rear film pasting jig for plastic package QFN and DFN products and a film pasting method, and relates to the field of semiconductor packaging. An adsorption limiting mechanism, a trepanning mechanism and a rear pasting film fixing mechanism are installed on a base, the adsorption limiting mechanism comprises an adsorption positioning platform, and the adsorption positioning platform is provided with an adsorption unit used for adsorbing a product frame and a limiting unit used for limiting the product frame; the trepanning mechanism is hinged to the first side of the adsorption positioning platform through a hinge part, a lifting reset part is further arranged on the hinge part, and the trepanning mechanism trepans a film on the back face of the product frame through a trepanning part; the rear film pasting fixing mechanism is located on the second side of the adsorption positioning platform and used for fixing the film pasting roll and recycling the protective film of the film pasting roll. Under the condition, various rear film pasting jigs do not need to be purchased, the risks of product deformation and gold wire pressing deflection caused by manual trepanning can be effectively reduced, bubbles and wrinkles generated during film pasting are reduced, and the packaging efficiency and the yield are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor packaging, and in particular to a universal post-film pasting fixture and a film pasting method for plastic-encapsulated QFN and DFN products. Background Art

[0002] QFN (Quad Flat No-Lead) and DFN (Dual Flat No-Lead) are two common leadless packages, which are widely used in various electronic components. They are characterized by small size, light weight, and good thermal and electrical properties. In order to protect these packaged chips, plastic packaging technology (molding) is usually used for packaging. Plastic packaging is superior to airtight packaging in terms of size, weight, performance, and cost. Plastic packaging devices account for about 97% of the world's commercial chip packaging market.

[0003] During the packaging process, the chip is mounted at the wafer loading station and the chip is attached to the front of the product frame. After the chip is attached, the product frame is wired (gold wired) at the bonding station. The chip bonding wires (gold wires) are on the pins of the product frame to connect the chip to the outside for communication. Before the bonded product goes to the mold sealing operation, the back of the product frame must be post-filmed. The post-filming operation can prevent glue overflow from the back of the product frame and the product from being adsorbed on the mold to prevent warping.

[0004] However, the current post-film sticking jig for pre-molding processing is a fixed post-film sticking jig corresponding to the fixed product. There are many types of post-film sticking jigs. During operation, the product and jig drawings must be compared one by one to select the corresponding jig for installation, which wastes manpower and material resources. The jig does not have the automatic hole opening function for the film on the back of the product frame. Instead, a tungsten needle needs to be used to manually open holes in the film so that the holes in the film correspond to the positioning holes on the product frame. In the process of manual hole opening with a tungsten needle, it is easy to cause deformation of the product frame, crooked gold wire of the product, poor consistency of product hole opening, low film sticking efficiency, and easy generation of bubbles and wrinkles, which in turn affects the quality of the product and production efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a universal post-film pasting fixture and film pasting method for plastic-encapsulated QFN and DFN products to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, the present application provides a universal post-filming jig for plastic-encapsulated QFN and DFN products, including a base, on which is mounted: The adsorption and limiting mechanism comprises an adsorption and positioning platform, wherein the adsorption and positioning platform has an adsorption unit for adsorbing the product frame and a limiting unit for limiting the product frame; A hole-opening mechanism, which is hinged to the first side of the adsorption positioning platform through a hinged portion, and the hinged portion is further provided with a lifting and resetting portion, and the hole-opening mechanism opens a hole in the film on the back of the product frame through the hole-opening portion; and The rear film fixing mechanism is located on the second side of the adsorption positioning platform, the first side and the second side of the adsorption positioning platform are perpendicular to each other, and is used to fix the film roll and recycle the protective film of the film roll.

[0007] In a possible implementation, the adsorption unit matches the size of the product frame, the upper plane of the adsorption unit is lower than the upper plane of the adsorption positioning platform, and the height difference between the upper plane of the adsorption unit and the upper plane of the adsorption positioning platform is the thickness value of the product frame after film is affixed.

[0008] In a possible implementation, the adsorption unit includes an outer frame portion forming a sun shape, and two square grooves, the outer frame portion is provided with a plurality of adsorption holes spaced apart from each other, the plurality of adsorption holes are connected to a plurality of exhaust holes on the side wall of the adsorption positioning platform, the plurality of exhaust holes are connected to an external vacuum pump through a multi-channel switching valve, and the two square grooves are used to prevent the gold wire of the product from being deformed when the film is applied.

[0009] In a possible implementation, the limiting unit includes a plurality of elastic limiting columns located at the periphery of the adsorption unit, and the plurality of elastic limiting columns are inserted into the interior of the adsorption positioning platform through springs.

[0010] In a possible implementation, the adsorption and positioning platform further has a film cutting groove for cutting the film roll, and the film cutting groove is located on a side of the adsorption unit close to the rear film fixing mechanism.

[0011] In a possible implementation, the adsorption and positioning platform further has a guide slope for guiding the film-sticking roller, and the guide slope is located on a side of the adsorption unit away from the rear film-sticking fixing mechanism.

[0012] In one possible implementation, the opening portion includes an opening pressure plate and a plurality of opening needles for opening holes in the film on the back of the product frame, and the adsorption unit has a plurality of matching holes corresponding to the plurality of opening needles, and the plurality of opening needles and the plurality of matching holes all match the plurality of positioning holes on the product frame.

[0013] In a possible implementation, the hinged part includes a hinged column and a latch, and the perforated pressure plate is hinged to the hinged seat of the adsorption positioning platform through the hinged column and the latch; the lifting and resetting part arranged on the hinged part includes a lifting groove on the inner side of the hinged column, and the lifting pin is movably arranged in the lifting groove through a guide block at its lower part, and the guide block is connected to the bottom of the lifting groove through a reset spring, and the upper part of the lifting pin is connected to the perforated pressure plate through a pin cap.

[0014] In a possible implementation, the rear film fixing mechanism includes a fixing seat, and a first core shaft and a second core shaft installed on the fixing seat at intervals, the first core shaft is used for sleeved film roll, and the second core shaft is used for recovering the protective film of the film roll.

[0015] In a second aspect, the present application provides a universal post-filming method for plastic-encapsulated QFN and DFN products, the method being applicable to the universal post-filming jig for plastic-encapsulated QFN and DFN products as described above, the method comprising: S1, putting an unused film roll on the first mandrel of the rear film fixing mechanism; S2. Place the product frame with the chip facing downward on the adsorption unit of the adsorption limiting mechanism, so that the side of the product frame with the positioning hole is consistent with the position of the hole opening mechanism, and ensure that the product frame overlaps with the adsorption unit through multiple elastic limiting columns of the limiting unit; S3, start the external vacuum pump to provide a suction force of .Mpa to the multiple suction holes on the side wall of the adsorption positioning platform, so that the multiple adsorption holes on the outer frame of the adsorption unit generate suction force to firmly adsorb the product frame; S4, pulling the adhesive layer of the film roll from the rear film fixing mechanism to the guide slope of the adsorption positioning platform, and pressing the adhesive layer of the film roll at the guide slope to make the adhesive layer of the film roll closely fit the guide slope, and the protective film separated from the film roll is recovered through the second core shaft of the rear film fixing mechanism; S5, manually holding the roller and rolling it from the position of the guide slope to the position of the rear film fixing mechanism. When the roller passes through the multiple elastic limiting columns of the limiting unit, the elastic limiting columns are lowered into the interior of the adsorption positioning platform through the springs below them under the pressure of the roller, ensuring the stability of the roller during the moving process; S6, after the film is pasted, the film cutting groove of the adsorption positioning platform is operated by using the blade to cut the film roll; S7, pressing down the hole-opening pressing plate of the hole-opening mechanism to make multiple holes for the film on the back of the product frame, and releasing the hole-opening pressing plate after the holes are opened, and returning the hole-opening pressing plate to the initial position with the help of the return spring in the lifting slot; S8, turning off the external vacuum pump, taking out the product frame, and completing the post-filming of the product.

[0016] The beneficial effects brought about by the technical solution provided by the present invention include at least: By installing an adsorption limiting mechanism, a hole opening mechanism, and a rear film fixing mechanism on the base, the adsorption limiting mechanism includes an adsorption positioning platform, and the adsorption positioning platform has an adsorption unit for adsorbing the product frame and a limit unit for limiting the product frame; the hole opening mechanism is hinged to the first side of the adsorption positioning platform through a hinge, and a lifting and resetting part is also provided on the hinge, and the hole opening mechanism opens a hole in the film on the back of the product frame through the hole opening part; the rear film fixing mechanism is located on the second side of the adsorption positioning platform, and is used to fix the film roll and recycle the protective film of the film roll. In this case, there is no need to purchase a wide variety of rear film fixtures, thereby reducing the cost of purchasing fixtures, and can effectively reduce the risk of product deformation and gold wire crookedness caused by manual hole opening, reduce bubbles and wrinkles generated during film application, and improve packaging efficiency and yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0018] Figure 1 A schematic structural diagram of a universal post-film lamination fixture for plastic-encapsulated QFN and DFN products provided by an exemplary embodiment of the present invention is shown.

[0019] Figure 2 A structural schematic diagram of a product framework provided by an exemplary embodiment of the present invention is shown.

[0020] Figure 3 A schematic structural diagram of an adsorption and limiting mechanism of a universal post-film lamination fixture for plastic-encapsulated QFN and DFN products provided by an exemplary embodiment of the present invention is shown.

[0021] Figure 4 Shows Figure 3 A local enlarged schematic diagram of point A.

[0022] Figure 5 A schematic side view of the structure of a universal post-film lamination jig for plastic-encapsulated QFN and DFN products provided by an exemplary embodiment of the present invention is shown.

[0023] In the figure: 1. Base; 2. Adsorption and limiting mechanism; 21. Adsorption and positioning platform; 22. Adsorption unit; 23. Limiting unit; 24. Film-cutting groove; 25. Guide slope; 211. Air extraction hole; 212. Articulated seat; 221. Outer frame; 222. Square groove; 223. Adsorption hole; 224. Matching hole; 231. Elastic limiting column; 3. Opening mechanism; 31. Articulated part; 32. Lifting and resetting part; 33. Opening part; 311. Articulated column; 312. Latch; 321. Lifting slot; 322. Lifting pin; 323. Guide block; 324. Resetting spring; 325. Pin cap; 331. Opening pressure plate; 332. Opening needle; 4. Rear film fixing mechanism; 41. Fixing seat; 42. First mandrel; 43. Second mandrel; 5. Product frame; 51. Positioning hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0025] Among them, the same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings of the specification of the present invention, and the words "bottom surface" and "top surface", "inside" and "outside" refer to the direction towards or away from a specific component, respectively. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the specification of the present invention, the meaning of "multiple" is two or more.

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1 The following is a schematic diagram showing the structure of a universal post-film lamination jig for plastic-encapsulated QFN and DFN products provided by an exemplary embodiment of the present invention. Figure 2The structural schematic diagram of the product frame provided by an exemplary embodiment of the present invention is shown. This universal post-film pasting fixture for plastic-encapsulated QFN and DFN products includes a base 1. An adsorption and limiting mechanism 2, a hole-opening mechanism 3, and a post-film fixing mechanism 4 are installed on the base 1. The adsorption and limiting mechanism 2 includes an adsorption and positioning platform 21. An adsorption unit 22 for adsorbing the product frame 5 and a limiting unit 23 for limiting the product frame 5 are provided on the adsorption and positioning platform 21. The hole-opening mechanism 3 is hinged to the first side of the adsorption and positioning platform 21 through a hinge portion 31. A lifting and resetting portion 32 is also provided on the hinge portion 31. The hole-opening mechanism 3 opens holes in the film on the back of the product frame 5 through a hole-opening portion 33. The post-film fixing mechanism 4 is located on the second side of the adsorption and positioning platform 21. The first side and the second side of the adsorption and positioning platform 21 are perpendicular to each other, and are used for fixing the film roll and recycling the protective film of the film roll.

[0028] In the embodiment of the present application, the first side of the adsorption and positioning platform 21 is the long side of the adsorption and positioning platform 21, and the second side of the adsorption and positioning platform 21 is the short side of the adsorption and positioning platform 21.

[0029] It should be noted that the adsorption unit 22 is matched with the size of the product frame 5. The upper plane of the adsorption unit 22 is lower than the upper plane of the adsorption and positioning platform 21. The height difference between the upper plane of the adsorption unit 22 and the upper plane of the adsorption and positioning platform 21 is the thickness value of the product frame 5 after film pasting. It can make the product frame 5 flush with the upper surface of the adsorption and positioning platform 21 during the film pasting process, so as to achieve accurate positioning and fitting, and ensure the film pasting quality and consistency.

[0030] Specifically, Figure 3 The structural schematic diagram of the adsorption and limiting mechanism of the universal post-film pasting fixture for plastic-encapsulated QFN and DFN products provided by an exemplary embodiment of the present invention is shown. Figure 4 Shown is Figure 3 The partial enlarged schematic diagram at position A of. The adsorption unit 22 includes an outer frame portion 221 forming a "day" shape and two square grooves 222. A plurality of adsorption holes 223 are distributed at intervals on the outer frame portion 221. The plurality of adsorption holes 223 are communicated with a plurality of air extraction holes 211 on the side wall of the adsorption and positioning platform 21. The plurality of air extraction holes 211 are communicated with an external vacuum pump through a multi-path transfer valve. The two square grooves 222 are used to prevent the product gold wires from being deformed when pasting the film. This design ensures that the product can be firmly adsorbed on the platform during the film pasting process, and at the same time protects the gold wires from damage, thereby improving the accuracy and reliability of film pasting.

[0031] Furthermore, please refer to Figure 3 and Figure 4 , the limiting unit 23 includes a plurality of elastic limiting columns 231 located on the outer periphery of the adsorption unit 22. The plurality of elastic limiting columns 231 are all inserted into the interior of the adsorption and positioning platform 21 through springs.

[0032] In the embodiment of the present application, stable positioning is provided by the elastic limiting column 231 to ensure that the product is accurately positioned during the adsorption and film-sticking process, while not affecting the subsequent rolling operation of the roller. Under the rolling of the roller, the elastic limiting column 231 will retract into the interior of the adsorption positioning platform 21. It can be understood that the interior of the adsorption positioning platform 21 has a limiting hole for the elastic limiting column 231 and the spring to move.

[0033] For further information, see Figure 1 and Figure 3 The adsorption positioning platform 21 also has a film cutting groove 24 for cutting the film roll, and the film cutting groove 24 is located on the side of the adsorption unit 22 close to the rear film fixing mechanism 4. The adsorption positioning platform 21 also has a guide slope 25 for guiding the film roller, and the guide slope 25 is located on the side of the adsorption unit 22 away from the rear film fixing mechanism 4.

[0034] In the embodiment of the present application, the film cutting groove 24 facilitates the quick and accurate cutting of the excess film material after the film is applied. The guide slope 25 helps the film application roller to smoothly transition, ensuring the flatness and alignment accuracy during the film application process, thereby improving the overall film application quality and efficiency. In one example, the angle between the guide slope 25 and the horizontal plane is 45°.

[0035] It is worth mentioning that the center lines of the guide slope 25, the adsorption unit 22, and the rear film fixing mechanism 4 along the long side direction of the universal rear film fixture for plastic-encapsulated QFN and DFN products coincide with each other. This ensures the precise alignment of various components during the film application process, so that the film application roller can move smoothly along the predetermined path, the adsorption unit 22 can accurately adsorb the product, and the rear film fixing mechanism 4 can firmly fix the film application material, thereby improving the accuracy and consistency of film application and reducing the film application defect rate caused by position deviation.

[0036] Specifically, Figure 1 The following is a schematic diagram showing the structure of a universal post-film lamination jig for plastic-encapsulated QFN and DFN products provided by an exemplary embodiment of the present invention. Figure 5A side view structural schematic diagram of a universal rear film-sticking fixture for plastic-encapsulated QFN and DFN products provided by an exemplary embodiment of the present invention is shown, wherein the opening portion 33 includes an opening pressure plate 331 and a plurality of opening needles 332 for opening holes in the film on the back of the product frame 5, and the adsorption unit 22 has a plurality of matching holes 224 corresponding to the plurality of opening needles 332, and the plurality of opening needles 332 and the plurality of matching holes 224 are matched with the plurality of positioning holes 51 on the product frame 5. The hinged part 31 includes a hinged column 311 and a latch 312, and the perforated pressure plate 331 is hinged to the hinged seat 212 of the adsorption positioning platform 21 through the hinged column 311 and the latch 312; the lifting and resetting part 32 arranged on the hinged part 31 includes a lifting groove 321 on the inner side of the hinged column 311, and the lifting pin 322 is movably arranged in the lifting groove 321 through the guide block 323 at its lower part, and the guide block 323 is connected to the bottom of the lifting groove 321 through the reset spring 324, and the upper part of the lifting pin 322 is connected to the perforated pressure plate 331 through the pin cap 325.

[0037] Preferably, the lifting groove 321 further has a guide groove matching the guide block 323 along the vertical direction.

[0038] In the embodiment of the present application, the plurality of hole-opening pins 332 , the plurality of matching holes 224 , and the plurality of positioning holes 51 are coaxially arranged to ensure the accuracy of the hole-opening positions.

[0039] In the embodiment of the present application, the hinge part 31 can realize the flexible flipping of the hole punching plate 331. The lifting and resetting part 32 ensures the stable lifting and automatic resetting of the hole punching plate 331 during the hole punching process, improves the hole punching accuracy and efficiency, and reduces the operation complexity and manual intervention.

[0040] More specifically, see Figure 1 The rear film fixing mechanism 4 includes a fixing seat 41, and a first core shaft 42 and a second core shaft 43 installed on the fixing seat 41 at intervals. The first core shaft 42 is used for sleeve mounting the film roll, and the second core shaft 43 is used for recovering the protective film of the film roll.

[0041] In the embodiment of the present application, the film roll is generally composed of an adhesive layer and a protective film. The adhesive layer is responsible for adhering to the target surface, and the protective film covers the adhesive layer and is mainly used to protect the adhesive layer from being contaminated or damaged during storage and transportation. In one example, the film roll is a high temperature resistant tape.

[0042] Next, a general post-filming method for plastic-encapsulated QFN and DFN products provided by the present invention is described. The method is applicable to the general post-filming jig for plastic-encapsulated QFN and DFN products as described above. The method specifically includes: Step S1, sleeve an unused film roll onto the first core shaft 42 of the rear film fixing mechanism 4; Step S2, place the product frame 5 with the chip attached facing downward on the adsorption unit 22 of the adsorption limiting mechanism 2, so that the side of the product frame 5 with the positioning hole 51 is consistent with the position of the hole opening mechanism 3, and ensure that the product frame 5 overlaps with the adsorption unit 22 through multiple elastic limiting columns 231 of the limiting unit 23; Step S3, start the external vacuum pump to provide 0.3Mpa suction force to the multiple suction holes 211 on the side wall of the adsorption positioning platform 21, so that the multiple adsorption holes 223 on the outer frame 221 of the adsorption unit 22 generate suction force to firmly adsorb the product frame 5; Step S4, pulling the adhesive layer of the film roll from the rear film fixing mechanism 4 to the guide slope 25 of the adsorption positioning platform 21, and pressing the adhesive layer of the film roll at the guide slope 25, so that the adhesive layer of the film roll is closely attached to the guide slope 25, and the protective film separated from the film roll is recovered through the second core shaft 43 of the rear film fixing mechanism 4; Step S5, manually holding the roller and rolling it from the position of the guide slope 25 to the position of the rear film fixing mechanism 4. When the roller passes through the multiple elastic limiting columns 231 of the limiting unit 23, the elastic limiting columns 231 are lowered into the interior of the adsorption positioning platform 21 by the springs below them under the pressure of the roller, ensuring the stability of the roller during the moving process; Step S6: After the film is pasted, the film cutting groove 24 of the positioning platform 21 is adsorbed by a blade to cut the film roll; Step S7, pressing down the hole-opening pressing plate 331 of the hole-opening mechanism 3, so that the plurality of hole-opening needles 332 open holes in the film on the back of the product frame 5, and after the hole-opening is completed, releasing the hole-opening pressing plate 331, and returning the hole-opening pressing plate 331 to the initial position with the help of the return spring 324 in the lifting slot 321; Step S8, turn off the external vacuum pump, take out the product frame 5, and complete the post-filming of the product.

[0043] It is worth mentioning that before step S7, the hole opening pressure plate 331 of the hole opening mechanism 3 is in an outward-turned state through the hinge part 31 to avoid affecting the roller film pasting; when the film pasting is completed, it is flipped back toward the adsorption unit 22, so that the multiple hole opening needles 332, the multiple matching holes 224, and the multiple positioning holes 51 are coaxial for precise hole opening.

[0044] In summary, by installing an adsorption limiting mechanism, a hole opening mechanism, and a rear film fixing mechanism on the base, the adsorption limiting mechanism includes an adsorption positioning platform, and the adsorption positioning platform has an adsorption unit for adsorbing the product frame and a limit unit for limiting the product frame; the hole opening mechanism is hinged to the first side of the adsorption positioning platform through a hinge, and a lifting and resetting part is also provided on the hinge, and the hole opening mechanism opens a hole in the film on the back of the product frame through the hole opening part; the rear film fixing mechanism is located on the second side of the adsorption positioning platform, and is used to fix the film roll and recycle the protective film of the film roll. In this case, there is no need to purchase a wide variety of rear film fixtures, thereby reducing the cost of purchasing fixtures, and can effectively reduce the risk of product deformation and gold wire crookedness caused by manual hole opening, reduce bubbles and wrinkles generated during film application, and improve packaging efficiency and yield.

[0045] In the embodiments disclosed in the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments disclosed in the present invention can be understood according to specific circumstances.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A universal post-film lamination jig for plastic-encapsulated QFN and DFN products, comprising a base (1), characterized in that: The base (1) is equipped with: An adsorption and limiting mechanism (2), comprising an adsorption and positioning platform (21), wherein the adsorption and positioning platform (21) has an adsorption unit (22) for adsorbing the product frame (5) and a limiting unit (23) for limiting the product frame (5); A hole-opening mechanism (3) is hinged to a first side of the adsorption positioning platform (21) via a hinged portion (31), the hinged portion (31) is further provided with a lifting and resetting portion (32), and the hole-opening mechanism (3) opens a hole in the film on the back of the product frame (5) via the hole-opening portion (33); and The rear film fixing mechanism (4) is located on the second side of the adsorption positioning platform (21), the first side and the second side of the adsorption positioning platform (21) being perpendicular to each other, and is used to fix the film roll and recycle the protective film of the film roll.

2. The universal post-film lamination jig for plastic-encapsulated QFN and DFN products according to claim 1, characterized in that: The adsorption unit (22) matches the size of the product frame (5), the upper plane of the adsorption unit (22) is lower than the upper plane of the adsorption positioning platform (21), and the height difference between the upper plane of the adsorption unit (22) and the upper plane of the adsorption positioning platform (21) is the thickness value of the product frame (5) after film pasting.

3. The universal post-filming jig for plastic-encapsulated QFN and DFN products according to claim 1, characterized in that: The adsorption unit (22) comprises an outer frame portion (221) forming a sun shape, and two square grooves (222); a plurality of adsorption holes (223) are spaced apart on the outer frame portion (221); the plurality of adsorption holes (223) are connected to a plurality of air extraction holes (211) on the side wall of the adsorption positioning platform (21); the plurality of air extraction holes (211) are connected to an external vacuum pump via a multi-channel switching valve; and the two square grooves (222) are used to prevent the gold wire of the product from being deformed by pressure when the film is applied.

4. The universal post-film lamination jig for plastic-encapsulated QFN and DFN products according to claim 1, characterized in that: The limiting unit (23) comprises a plurality of elastic limiting columns (231) located on the periphery of the adsorption unit (22), and the plurality of elastic limiting columns (231) are all inserted into the interior of the adsorption positioning platform (21) via springs.

5. The universal post-film lamination jig for plastic-encapsulated QFN and DFN products according to claim 1, characterized in that: The adsorption positioning platform (21) is also provided with a film cutting groove (24) for cutting the film roll, and the film cutting groove (24) is located on a side of the adsorption unit (22) close to the rear film fixing mechanism (4).

6. The universal post-film lamination jig for plastic-encapsulated QFN and DFN products according to claim 1, characterized in that: The adsorption positioning platform (21) also has a guide slope (25) for guiding a film pasting roller, and the guide slope (25) is located on a side of the adsorption unit (22) away from the rear film pasting fixing mechanism (4).

7. The universal post-film lamination jig for plastic-encapsulated QFN and DFN products according to claim 1, characterized in that: The hole-opening portion (33) comprises a hole-opening pressing plate (331) and a plurality of hole-opening needles (332) for opening holes in the film on the back of the product frame (5); the adsorption unit (22) has a plurality of matching holes (224) corresponding to the plurality of hole-opening needles (332); the plurality of hole-opening needles (332) and the plurality of matching holes (224) are matched with the plurality of positioning holes (51) on the product frame (5).

8. The universal post-film lamination jig for plastic-encapsulated QFN and DFN products according to claim 7, characterized in that: The hinged portion (31) comprises a hinged column (311) and a latch (312), and the perforated pressure plate (331) is hingedly connected to the hinged seat (212) of the adsorption positioning platform (21) through the hinged column (311) and the latch (312); the lifting and resetting portion (32) provided on the hinged portion (31) comprises a lifting groove (321) on the inner side of the hinged column (311), and the lifting pin (322) is movably arranged in the lifting groove (321) through a guide block (323) at its lower part, and the guide block (323) is connected to the bottom of the lifting groove (321) through a reset spring (324), and the upper part of the lifting pin (322) is connected to the perforated pressure plate (331) through a pin cap (325).

9. The universal post-film lamination jig for plastic-encapsulated QFN and DFN products according to claim 1, characterized in that: The rear film fixing mechanism (4) comprises a fixing seat (41), and a first core shaft (42) and a second core shaft (43) installed on the fixing seat (41) at intervals, wherein the first core shaft (42) is used for sleeve-mounting the film roll, and the second core shaft (43) is used for recovering the protective film of the film roll.

10. A universal post-film lamination method for plastic-encapsulated QFN and DFN products, the method being applicable to the universal post-film lamination jig for plastic-encapsulated QFN and DFN products as claimed in any one of claims 1 to 9, characterized in that: The method comprises: S1, sleeve an unused film roll onto a first core shaft (42) of a rear film fixing mechanism (4); S2, placing the product frame (5) with the chip attached facing downward on the adsorption unit (22) of the adsorption limiting mechanism (2), so that the side of the product frame (5) having the positioning hole (51) is aligned with the position of the hole opening mechanism (3), and ensuring that the product frame (5) overlaps with the adsorption unit (22) through a plurality of elastic limiting columns (231) of the limiting unit (23); S3, starting an external vacuum pump to provide a suction force of 0.3 Mpa to the multiple air extraction holes (211) on the side wall of the adsorption positioning platform (21), so that the multiple adsorption holes (223) on the outer frame (221) of the adsorption unit (22) generate a suction force to firmly adsorb the product frame (5); S4, pulling the adhesive layer of the film roll from the rear film fixing mechanism (4) to the guide slope (25) of the adsorption positioning platform (21), and pressing the adhesive layer of the film roll at the guide slope (25) so that the adhesive layer of the film roll is tightly attached to the guide slope (25), and the protective film separated from the film roll is recovered through the second core shaft (43) of the rear film fixing mechanism (4); S5, manually holding a roller and rolling it from the position of the guide slope (25) to the position of the rear film fixing mechanism (4), when the roller passes through the plurality of elastic limiting columns (231) of the limiting unit (23), the elastic limiting columns (231) are lowered into the interior of the adsorption positioning platform (21) by the springs below them under the pressure of the roller, thereby ensuring the stability of the roller during the moving process; S6, after the film is pasted, the film cutting groove (24) of the adsorption positioning platform (21) is operated by using a blade to cut the film roll; S7, pressing down the hole-opening pressing plate (331) of the hole-opening mechanism (3) so that the plurality of hole-opening needles (332) open holes in the film on the back of the product frame (5); after the hole-opening is completed, the hole-opening pressing plate (331) is released, and the hole-opening pressing plate (331) is reset to the initial position with the aid of the reset spring (324) in the lifting slot (321); S8, turning off the external vacuum pump, taking out the product frame (5), and completing the post-filming of the product.

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