Universal post-film application fixture and application method for QFN and DFN type products

Abstract

This invention relates to a universal post-film bonding fixture and method for molded QFN and DFN products, belonging to the semiconductor packaging field. By installing an adsorption limiting mechanism, an opening mechanism, and a post-film bonding fixing mechanism on a base, the adsorption limiting mechanism includes an adsorption positioning platform with adsorption units for adsorbing the product frame and limiting units for limiting the product frame. The opening mechanism is hinged to a first side of the adsorption positioning platform via a hinge portion, which also has a lifting and resetting part. The opening mechanism makes openings in the film on the back of the product frame through the opening portion. The post-film bonding fixing mechanism is located on a 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 configuration, there is no need to purchase a wide variety of post-film bonding fixtures, effectively reducing the risk of product deformation and gold wire misalignment caused by manual opening, reducing bubbles and wrinkles generated during film bonding, and improving packaging efficiency and yield.

Description

Technical Field

[0001] This invention relates to the field of semiconductor packaging technology, and in particular to a universal post-film bonding fixture and film bonding method for plastic-encapsulated QFN and DFN products. Background Technology

[0002] QFN (Quad Flat No-Lead) and DFN (Dual Flat No-Lead) are two common leadless package types widely used in various electronic components. They are characterized by their small size, light weight, and good thermal and electrical properties. To protect the chip within these packages, molding technology is typically used. Plastic packaging is superior to hermetic packaging in terms of size, weight, performance, and cost; molded devices account for approximately 97% of the global commercial chip packaging market.

[0003] During the packaging process, the die-mounting station mounts the chip onto the front of the product frame. After the chip is mounted, the product frame is then bonded by the bonding station (gold wire bonding). The chip bonding wires (gold wire bonding) are placed on the pins of the product frame for communication between the chip and the outside. Before the molding process, the back of the product frame must be coated with a film. The film coating process can prevent glue overflow on the back of the product frame and prevent the product from sticking to the mold and warping.

[0004] However, current post-film application fixtures for pre-molding processing are fixed to specific products. These fixtures are numerous and require careful matching of product and fixture drawings during installation. This wastes manpower and resources. Furthermore, these fixtures lack automatic hole-drilling functionality for applying film to the back of the product frame; instead, manual drilling with tungsten needles is necessary to align the holes with the positioning holes on the product frame. This manual drilling process can easily lead to product frame deformation, misaligned gold wires, poor hole consistency, low application efficiency, and the formation of bubbles and wrinkles, ultimately affecting product quality and production efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a universal post-film application fixture and method for QFN and DFN type products to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, this application provides a universal post-film application fixture for molded QFN and DFN type products, including a base on which:

[0008] An adsorption and limiting mechanism, which includes an adsorption and positioning platform, and there are an adsorption unit for adsorbing a product frame and a limiting unit for limiting the product frame on the adsorption and positioning platform;

[0009] An opening mechanism, which is hinged to the first side of the adsorption and positioning platform through a hinge part, and a lifting and resetting part is also arranged on the hinge part. The opening mechanism opens holes in the film on the back of the product frame through an opening part; and

[0010] A rear film fixing mechanism, which is located on the second side of the adsorption and positioning platform. The first side and the second side of the adsorption and positioning platform are perpendicular to each other, and is used for fixing a film roll and recycling the protective film of the film roll.

[0011] In a possible implementation manner, 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 and positioning platform, and the height difference between the upper plane of the adsorption unit and the upper plane of the adsorption and positioning platform is the thickness value after the product frame is pasted with film.

[0012] In a possible implementation manner, the adsorption unit includes an outer frame part forming a "day" shape and two square grooves. A plurality of adsorption holes are distributed at intervals on the outer frame part. The plurality of adsorption holes are communicated with a plurality of air extraction holes on the side wall of the adsorption and positioning platform. The plurality of air extraction holes are communicated with an external vacuum pump through a multi-path switching valve. The two square grooves are used to prevent the product gold wires from being deformed when pasting the film.

[0013] In a possible implementation manner, the limiting unit includes a plurality of elastic limiting columns located on the outer periphery of the adsorption unit. The plurality of elastic limiting columns are all inserted into the interior of the adsorption and positioning platform through springs.

[0014] In a possible implementation manner, there is also a film cutting groove for cutting the film roll on the adsorption and positioning platform. The film cutting groove is located on one side of the adsorption unit close to the rear film fixing mechanism.

[0015] In a possible implementation manner, there is also a guiding slope for guiding a film roller on the adsorption and positioning platform. The guiding slope is located on one side of the adsorption unit far from the rear film fixing mechanism.

[0016] In a possible implementation manner, the opening part includes an opening pressing plate and a plurality of opening needles for opening holes in the film on the back of the product frame. There are a plurality of matching holes corresponding to the plurality of opening needles on the adsorption unit. The plurality of opening needles and the plurality of matching holes all match a plurality of positioning holes on the product frame.

[0017] In one possible implementation, the hinge portion includes a hinge post and a pin, and the perforated pressure plate is hinged to the hinge seat of the adsorption positioning platform through the hinge post and the pin; the lifting and resetting portion provided on the hinge portion includes a lifting groove inside the hinge post, the lifting pin is movably disposed in the lifting groove through a guide block at its lower part, 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.

[0018] In one possible implementation, the post-applying film fixing mechanism includes a fixing base and a first spindle and a second spindle spaced apart on the fixing base. The first spindle is used to apply the film roll, and the second spindle is used to retract the protective film from the film roll.

[0019] Secondly, this application provides a universal post-coating method for molded QFN and DFN type products, the method being applicable to the universal post-coating fixture for molded QFN and DFN type products as described above, the method comprising:

[0020] S1. Place the unused film roll onto the first spindle of the rear film fixing mechanism;

[0021] S2. Place the product frame with the chip attached side down on the adsorption unit of the adsorption limiting mechanism, so that the side of the product frame with the positioning hole is aligned with the location of the opening mechanism, and ensure that the product frame overlaps with the adsorption unit through multiple elastic limiting posts of the limiting unit.

[0022] S3. Start the external vacuum pump to provide a suction force of 0. MPa to the multiple air extraction 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 and firmly hold the product frame.

[0023] S4. Pull the adhesive layer of the film roll from the rear film fixing mechanism to the guide slope of the adsorption positioning platform, and press the adhesive layer of the film roll at the guide slope to make the adhesive layer of the film roll fit tightly with the guide slope, while the protective film separated from the film roll is recycled through the second core shaft of the rear film fixing mechanism.

[0024] S5. The manual hand-held roller is rolled from the position of the guide ramp to the position of the rear film fixing mechanism. When the roller passes through the multiple elastic limiting posts of the limiting unit, the elastic limiting posts descend into the interior of the adsorption positioning platform under the pressure of the roller, ensuring the stability of the roller during the movement.

[0025] S6. After the film is applied, use the film-cutting groove of the adsorption positioning platform described by the blade to cut the film roll.

[0026] S7. Press down the opening plate of the opening mechanism to make multiple openings for the film on the back of the product frame. After the opening is completed, release the opening plate and use the return spring in the lifting groove to return the opening plate to the initial position.

[0027] S8. Turn off the external vacuum pump, remove the product frame, and complete the post-coating of the product.

[0028] The beneficial effects of the technical solution provided by this invention include at least the following:

[0029] By installing an adsorption limiting mechanism, an opening mechanism, and a post-film application fixing mechanism on a base, the adsorption limiting mechanism includes an adsorption positioning platform with adsorption units for adsorbing the product frame and limiting units for limiting the product frame. The opening mechanism is hinged to the first side of the adsorption positioning platform via a hinge, which also has a lifting and resetting part. The opening mechanism makes openings in the film on the back of the product frame through the opening. The post-film application 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 variety of post-film application fixtures, thereby reducing fixture purchase costs. It can also effectively reduce the risk of product deformation and gold wire misalignment caused by manual opening, reduce bubbles and wrinkles generated during film application, and improve packaging efficiency and yield. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0031] Figure 1 A schematic diagram of the structure of a universal post-applying fixture for QFN and DFN type products provided by an exemplary embodiment of the present invention is shown.

[0032] Figure 2 A schematic diagram of the product framework provided by an exemplary embodiment of the present invention is shown.

[0033] Figure 3 A schematic diagram of the adsorption limiting mechanism of a universal post-applying fixture for QFN and DFN type products provided by an exemplary embodiment of the present invention is shown.

[0034] Figure 4 It shows Figure 3 A magnified view of part A.

[0035] Figure 5 The diagram shows a side view of a universal post-applying fixture for QFN and DFN type products provided in an exemplary embodiment of the present invention.

[0036] In the picture:

[0037] 1. Base;

[0038] 2. Adsorption limiting mechanism; 21. Adsorption positioning platform; 22. Adsorption unit; 23. Limiting unit; 24. Dip groove; 25. Guide ramp; 211. Air extraction hole; 212. Hinge seat; 221. Outer frame; 222. Square groove; 223. Adsorption hole; 224. Mating hole; 231. Elastic limiting post;

[0039] 3. Hole-opening mechanism; 31. Hinge part; 32. Lifting and resetting part; 33. Hole-opening part; 311. Hinge column; 312. Pin; 321. Lifting groove; 322. Lifting pin; 323. Guide block; 324. Reset spring; 325. Pin cap; 331. Hole-opening pressure plate; 332. Hole-opening pin;

[0040] 4. Rear film fixing mechanism; 41. Fixing base; 42. First spindle; 43. Second spindle;

[0041] 5. Product frame; 51. Positioning holes. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "multiple" means two or more.

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] Figure 1 This diagram illustrates the structure of a universal post-film application fixture for QFN and DFN type products provided in an exemplary embodiment of the present invention. Figure 2The schematic structural diagram of the product frame provided by an exemplary embodiment of the present invention is shown. This universal post-film sticking fixture for plastic-encapsulated QFN and DFN products includes a base 1, on which an adsorption and limiting mechanism 2, a hole-opening mechanism 3, and a post-film sticking fixing mechanism 4 are installed. The adsorption and limiting mechanism 2 includes an adsorption and positioning platform 21, on which an adsorption unit 22 for adsorbing the product frame 5 and a limiting unit 23 for limiting the product frame 5 are provided; the hole-opening mechanism 3 is hinged to the first side of the adsorption and positioning platform 21 through a hinge part 31, and a lifting and resetting part 32 is also provided on the hinge part 31. The hole-opening mechanism 3 opens holes in the film on the back of the product frame 5 through a hole-opening part 33; the post-film sticking fixing mechanism 4 is located on the second side of the adsorption and positioning platform 21, and 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.

[0046] 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.

[0047] 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, and 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 sticking. It can make the product frame 5 flush with the upper surface of the adsorption and positioning platform 21 during the film sticking process, so as to achieve accurate positioning and fitting, and ensure the film sticking quality and consistency.

[0048] Specifically, Figure 3 The schematic structural diagram of the adsorption and limiting mechanism of the universal post-film sticking 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 A of, the adsorption unit 22 includes an outer frame part 221 forming a "day" shape, and two square grooves 222. A plurality of adsorption holes 223 are distributed at intervals on the outer frame part 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 connected to 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 sticking the film. This design ensures that the product can be firmly adsorbed on the platform during the film sticking process, and at the same time protects the gold wires from being damaged, thereby improving the accuracy and reliability of the film sticking.

[0049] Furthermore, please refer to Figure 3 and Figure 4 , the limiting unit 23 includes a plurality of elastic limiting columns 231 located outside the adsorption unit 22, and the plurality of elastic limiting columns 231 are all inserted into the interior of the adsorption and positioning platform 21 through springs.

[0050] In this embodiment, the elastic limiting post 231 provides stable positioning, ensuring that the product is accurately aligned during adsorption and film application, without affecting the subsequent rolling operation of the roller. Under the rolling of the roller, the elastic limiting post 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 movement of the elastic limiting post 231 and the spring.

[0051] Furthermore, please refer to Figure 1 and Figure 3 The adsorption positioning platform 21 also has a scribing groove 24 for cutting the film roll, which is located on the side of the adsorption unit 22 near the rear film fixing mechanism 4. The adsorption positioning platform 21 also has a guide ramp 25 for guiding the film roller, which is located on the side of the adsorption unit 22 away from the rear film fixing mechanism 4.

[0052] In this embodiment, the scribe groove 24 facilitates the quick and accurate cutting of excess film material after application. The guide ramp 25 helps the application rollers transition smoothly, ensuring flatness and alignment accuracy during the application process, thereby improving overall application quality and efficiency. In one example, the guide ramp 25 forms a 45° angle with the horizontal plane.

[0053] It is worth mentioning that the guide ramp 25, the adsorption unit 22, and the rear film fixing mechanism 4 coincide along the centerline of the long side of the universal rear film fixing fixture for QFN and DFN type plastic-sealed products. This ensures precise alignment of each component during the film application process, allowing the film application roller to move smoothly along the predetermined path, the adsorption unit 22 to accurately adsorb the product, and the rear film fixing mechanism 4 to firmly fix the film material, thereby improving the accuracy and consistency of the film application and reducing the defect rate of film application caused by positional deviation.

[0054] Specifically, Figure 1 This diagram illustrates the structure of a universal post-film application fixture for QFN and DFN type products provided in an exemplary embodiment of the present invention. Figure 5The diagram shows a side view of a universal back-applying fixture for QFN and DFN type products provided by an exemplary embodiment of the present invention. The opening portion 33 includes an opening pressure plate 331 and a plurality of opening pins 332 for opening the film on the back of the product frame 5. The adsorption unit 22 has a plurality of mating holes 224 corresponding to the plurality of opening pins 332. The plurality of opening pins 332 and the plurality of mating holes 224 are all matched with the plurality of positioning holes 51 on the product frame 5. The hinge part 31 includes a hinge post 311 and a pin 312. The perforated pressure plate 331 is hinged to the hinge seat 212 of the adsorption positioning platform 21 through the hinge post 311 and the pin 312. The lifting and resetting part 32 provided on the hinge part 31 includes a lifting groove 321 inside the hinge post 311. The lifting pin 322 is movably disposed in the lifting groove 321 through the guide block 323 at its lower part. The guide block 323 is connected to the bottom of the lifting groove 321 through the reset spring 324. The upper part of the lifting pin 322 is connected to the perforated pressure plate 331 through the pin cap 325.

[0055] Preferably, the lifting groove 321 also has a guide groove that matches the guide block 323 along the vertical direction.

[0056] In this embodiment, multiple opening pins 332, multiple mating holes 224, and multiple positioning holes 51 are coaxially arranged to ensure the accuracy of the opening position.

[0057] In this embodiment, the hinge 31 enables the flexible flipping of the perforation plate 331. The lifting and resetting part 32 ensures the stable lifting and automatic resetting of the perforation plate 331 during the perforation process, improving the accuracy and efficiency of perforation while reducing operational complexity and manual intervention.

[0058] For more details, please refer to Figure 1 The post-applying film fixing mechanism 4 includes a fixing base 41 and a first spindle 42 and a second spindle 43 spaced apart on the fixing base 41. The first spindle 42 is used to fit the film roll, and the second spindle 43 is used to retract the protective film of the film roll.

[0059] In this embodiment, the film roll typically consists of two parts: 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, primarily used to protect the adhesive layer from contamination or damage during storage and transportation. In one example, the film roll is a high-temperature resistant adhesive tape.

[0060] Next, a universal post-coating method for QFN and DFN type products provided by the present invention will be described. This method is applicable to the above-mentioned universal post-coating fixture for QFN and DFN type products. The method specifically includes:

[0061] Step S1: Place the unused film roll onto the first spindle 42 of the rear film fixing mechanism 4;

[0062] Step S2: Place the product frame 5 with the chip attached side down 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 aligned with the position of the opening mechanism 3, and ensure that the product frame 5 overlaps with the adsorption unit 22 through the multiple elastic limiting posts 231 of the limiting unit 23.

[0063] Step S3: Start the external vacuum pump to provide 0.3 MPa suction force 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 will generate suction force to firmly hold the product frame 5.

[0064] Step S4: Pull 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 press 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. The protective film separated from the film roll is recycled through the second core shaft 43 of the rear film fixing mechanism 4.

[0065] Step S5: Manually hold the roller and roll it from the position of the guide ramp 25 to the position of the film fixing mechanism 4. When the roller passes through the multiple elastic limiting posts 231 of the limiting unit 23, the elastic limiting posts 231 descend into the interior of the adsorption positioning platform 21 under the pressure of the roller, ensuring the stability of the roller during the movement.

[0066] Step S6: After the film is applied, use the cutting groove 24 of the blade adsorption positioning platform 21 to cut the film roll.

[0067] Step S7: Press down the opening plate 331 of the opening mechanism 3 so that multiple opening needles 332 make holes in the film on the back of the product frame 5. After the opening is completed, release the opening plate 331 and use the return spring 324 in the lifting groove 321 to return the opening plate 331 to the initial position.

[0068] Step S8: Turn off the external vacuum pump, remove the product frame 5, and complete the post-coating of the product.

[0069] It is worth mentioning that before step S7, the opening plate 331 of the opening mechanism 3 is in an outward-turned state through the hinge part 31 to avoid affecting the roller film application; after the film application is completed, it is flipped back towards the adsorption unit 22 so that the multiple opening pins 332, multiple mating holes 224 and multiple positioning holes 51 are coaxial and perform precise opening.

[0070] In summary, by installing an adsorption limiting mechanism, an opening mechanism, and a post-film application fixing mechanism on the base, the adsorption limiting mechanism includes an adsorption positioning platform with adsorption units for adsorbing the product frame and limiting units for limiting the product frame. The opening mechanism is hinged to the first side of the adsorption positioning platform via a hinge, which also has a lifting and resetting part. The opening mechanism makes openings for the film on the back of the product frame through the opening part. The post-film application 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 variety of post-film application fixtures, thereby reducing fixture purchase costs. It can also effectively reduce the risk of product deformation and gold wire misalignment caused by manual opening, reduce bubbles and wrinkles generated during film application, and improve packaging efficiency and yield.

[0071] In the embodiments disclosed in this invention, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this invention according to the specific circumstances.

[0072] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A universal post-film application fixture for QFN and DFN type products, comprising a base (1), characterized in that, The base (1) is equipped with: The adsorption limiting mechanism (2) includes an adsorption positioning platform (21) having an adsorption unit (22) for adsorbing the product frame (5) and a limiting unit (23) for limiting the product frame (5). An opening mechanism (3) is hinged to the first side of the adsorption positioning platform (21) via a hinge (31). The hinge (31) is also equipped with a lifting and resetting part (32). The opening mechanism (3) makes an opening in the film on the back of the product frame (5) via the opening part (33). The post-applying film fixing mechanism (4) is located on the second side of the adsorption positioning platform (21), and the first side and the second side of the adsorption positioning platform (21) are perpendicular to each other. It is used to fix the film roll and recycle the protective film of the film roll. The adsorption unit (22) includes an outer frame (221) forming a sun shape and two square grooves (222). Multiple adsorption holes (223) are distributed at intervals on the outer frame (221). The multiple adsorption holes (223) are connected to multiple air extraction holes (211) on the side wall of the adsorption positioning platform (21). The multiple air extraction holes (211) are connected to an external vacuum pump through a multi-channel transfer valve. The two square grooves (222) are used to prevent the gold wire of the product from being deformed when applying the film.

2. The universal post-film application fixture for QFN and DFN type products according to claim 1, characterized in that, The adsorption unit (22) is matched with the size of the product frame (5). The upper surface of the adsorption unit (22) is lower than the upper surface of the adsorption positioning platform (21). The height difference between the upper surface of the adsorption unit (22) and the upper surface of the adsorption positioning platform (21) is the thickness value of the product frame (5) after the film is applied.

3. The universal post-film application fixture for QFN and DFN type products according to claim 1, characterized in that, The limiting unit (23) includes a plurality of elastic limiting posts (231) located on the outer periphery of the adsorption unit (22), and the plurality of elastic limiting posts (231) are inserted into the interior of the adsorption positioning platform (21) by means of springs.

4. The universal post-film application fixture for QFN and DFN type products according to claim 1, characterized in that, The adsorption positioning platform (21) also has a scribing groove (24) for cutting the film roll, and the scribing groove (24) is located on the side of the adsorption unit (22) close to the post-film fixing mechanism (4).

5. The universal post-film application fixture for QFN and DFN type products according to claim 1, characterized in that, The adsorption positioning platform (21) also has a guide ramp (25) for guiding the film-applying roller, the guide ramp (25) being located on the side of the adsorption unit (22) away from the rear film-applying fixing mechanism (4).

6. The universal post-film application fixture for QFN and DFN type products according to claim 1, characterized in that, The opening portion (33) includes an opening pressure plate (331) and a plurality of opening pins (332) for making openings in the film on the back of the product frame (5). The adsorption unit (22) has a plurality of mating holes (224) corresponding to the plurality of opening pins (332). The plurality of opening pins (332) and the plurality of mating holes (224) are all matched with the plurality of positioning holes (51) on the product frame (5).

7. The universal post-film application fixture for QFN and DFN type products according to claim 6, characterized in that, The hinge part (31) includes a hinge post (311) and a pin (312). The perforated pressure plate (331) is hinged to the hinge seat (212) of the adsorption positioning platform (21) through the hinge post (311) and the pin (312). The lifting and resetting part (32) provided on the hinge part (31) includes a lifting groove (321) inside the hinge post (311). The lifting pin (322) is movably disposed in the lifting groove (321) through the guide block (323) at its lower part. The guide block (323) is connected to the bottom of the lifting groove (321) through a reset spring (324). The upper part of the lifting pin (322) is connected to the perforated pressure plate (331) through a pin cap (325).

8. The universal post-film application fixture for QFN and DFN type products according to claim 1, characterized in that, The post-applying film fixing mechanism (4) includes a fixing seat (41) and a first spindle (42) and a second spindle (43) spaced apart on the fixing seat (41). The first spindle (42) is used to apply the film roll, and the second spindle (43) is used to recycle the protective film of the film roll.

9. A universal post-coating method for molded QFN and DFN products, the method being applicable to the universal post-coating fixture for molded QFN and DFN products as described in any one of claims 1 to 8, characterized in that, The method includes: S1. Place the unused film roll onto the first spindle (42) of the rear film fixing mechanism (4); S2. Place the product frame (5) with the chip attached side down 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 aligned with the orientation of the opening mechanism (3), and ensure that the product frame (5) overlaps with the adsorption unit (22) through the multiple elastic limiting posts (231) of the limiting unit (23). S3. Start the external vacuum pump to provide 0.3 MPa suction force 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 suction force to firmly hold the product frame (5). S4. Pull 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 press 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 recycled through the second core shaft (43) of the rear film fixing mechanism (4); S5. Manually hold the roller and roll it from the position of the guide ramp (25) to the position of the back film fixing mechanism (4). When the roller passes through the multiple elastic limiting posts (231) of the limiting unit (23), under the pressure of the roller, the elastic limiting posts (231) descend into the interior of the adsorption positioning platform (21) through the spring below them, ensuring the stability of the roller during the movement. S6. After the film is applied, use the film slicing groove (24) of the adsorption positioning platform (21) described by the blade to cut the film roll. S7. Press down the opening plate (331) of the opening mechanism (3) so that multiple opening needles (332) make holes in the film on the back of the product frame (5). After the opening is completed, release the opening plate (331) and use the return spring (324) in the lifting groove (321) to return the opening plate (331) to the initial position. S8. Turn off the external vacuum pump, remove the product frame (5), and complete the post-coating of the product.

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