Measurement jig for QFN (Quad Flat No-lead) dispensing and covering product

Abstract

The utility model relates to a QFN (Quad Flat No-lead) dispensing and covering product measuring jig, which comprises a bottom plate and a measuring plate, the bottom plate is provided with an accommodating cavity for placing a product, a positioning pin is arranged in the accommodating cavity, the measuring plate is provided with a plurality of unit grooves, the product is provided with a plurality of packaging bodies, and each packaging body is provided with a cover plate. The product is placed in the containing cavity, the measuring plate covers the product, the cover plate is located in the unit groove, the product and the measuring plate are fixed through the positioning pin, and the measuring plate is made of stainless steel. According to the measuring jig, the packaging body on the product is rapidly positioned and exposed through the unit grooves of the measuring plate, so that a microscope can conveniently, rapidly and accurately measure the cover plate on the packaging body and the dispensing condition, and the measuring requirement of the small-particle packaging body is met.

Description

Technical Field

[0001] The present application relates to QFN measurement technology, and in particular to a QFN dispensing cover product measurement jig. Background Art

[0002] The surface of the integrated circuit QFN (Quad Flat No-leads Package) needs to be covered due to the requirements of the internal MEMS function. The covering is completed on a whole board. A whole board includes multiple small particle products. For example, the size of a small particle product is 2*2 mm, and each product needs to be covered. During operation, it is necessary to first dispense glue on the product, and then apply the cover after dispensing glue. The glue dispensing cover needs to be pasted with a 0.8*0.8 mm cover within the 2*2 mm space specified by QFN. Since the packaged products are not cut open, there is no dividing line between the small particle products, so it is difficult to identify the small particle products, which brings difficulties to the detection of small particle products after dispensing glue and covering. Utility Model Content

[0003] In order to overcome the above-mentioned defects, the present application provides a QFN dispensing cover product measurement fixture, in which the package on the product is quickly located and exposed through the unit groove of the measuring plate, so that the microscope can quickly and accurately measure the cover and dispensing conditions on the package, thereby meeting the measurement requirements of small particle packages.

[0004] The technical solution adopted by this application to solve its technical problems is:

[0005] A QFN dispensing cover product measuring fixture comprises a base plate and a measuring plate, wherein the base plate is provided with a receiving cavity for placing a product, the receiving cavity is provided with a positioning pin, the measuring plate is provided with a plurality of unit grooves, the product is provided with a plurality of packaging bodies, each of the packaging bodies is provided with a cover plate, during testing, the product is placed in the receiving cavity, the measuring plate covers the product, and the cover plate is located in the unit groove, the product and the measuring plate are fixed by the positioning pin, and the material of the measuring plate comprises stainless steel.

[0006] Optionally, the distance between the upper surface of the bottom plate and the bottom of the accommodating cavity is 3.5 mm±0.5 mm, and the thickness of the measuring plate is 0.3 mm±0.05 mm.

[0007] Optionally, the size of the unit groove is larger than the size of the cover plate, and the cover plate protrudes from the upper surface of the measurement plate.

[0008] Optionally, the unit groove is a square groove, and the side length of the unit groove is 1.6 mm±0.2 mm. The upper surface of the cover plate is square, and the side length of the upper surface of the cover plate is 0.8 mm±0.1 mm.

[0009] Optionally, the distance between two adjacent unit grooves is 0.6 mm±0.2 mm, and a connecting strip is provided between two adjacent unit grooves.

[0010] Optionally, a first positioning hole is provided on the base plate, a second positioning hole is provided on the measuring plate, a third positioning hole is provided on the product, the positioning pin 18 is fixed in the first positioning hole, and the positioning pin passes through the third positioning hole and the second positioning hole in sequence to position and fix the product and the measuring plate on the base plate.

[0011] Optionally, a convex block is provided at a corner end of the measuring plate, a positioning groove is provided on the bottom plate, and the convex block is placed in the positioning groove.

[0012] Optionally, a notch is provided on an edge of the bottom plate, the product at least covers a portion of the notch, and a through groove is provided on the bottom of the accommodating cavity.

[0013] The beneficial effects of the present application are as follows: the present application uses stainless steel material to make the measuring plate, which improves the machinability of the measuring plate and ensures that an ultra-thin measuring plate can be machined, and the stainless steel material is more solid, not easy to be damaged, and has high machining accuracy; at the same time, a window is directly opened on the measuring plate, that is, a unit groove is directly machined, so that the measurement target is directly exposed under the lens of the microscope, even if the measurement target and the measurement window reference line of the microscope are on the same plane, the measurement error is eliminated, the measurement accuracy is improved, and the measurement accuracy requirement of the product within 50μm can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the bottom plate in this application;

[0015] Figure 2 It is a schematic diagram of the structure of the measuring board in this application;

[0016] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0017] In the figure: 10-bottom plate, 11-upper surface, 12-accommodating cavity, 13-bottom, 14-through groove, 15-positioning groove, 16-first positioning hole, 17-notch, 18-positioning pin, 20-measuring plate, 21-unit groove, 22-bump, 23-second positioning hole, 24-connecting strip. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the embodiments described in the present application are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the following drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0021] Example: Figure 1-3As shown, a QFN dispensing cover product measuring fixture includes a base plate 10 and a measuring plate 20. The base plate 10 is provided with a receiving cavity 12 for placing the product, and the receiving cavity 12 is provided with a positioning pin 18. The measuring plate 20 is provided with a plurality of unit grooves 21. The product is provided with a plurality of packages, and each package is provided with a cover plate. During testing, the product is placed in the receiving cavity 12, and the measuring plate 20 covers the product, and the cover plate is located in the unit groove 21. The product and the measuring plate 20 are fixed by the positioning pin 18, and the material of the measuring plate 20 includes stainless steel. The measuring plate 20 is made of stainless steel, which is easy to process and not easily damaged.

[0022] The present application includes a base plate 10 and a measuring plate 20. The base plate 10 is used to load and position the product. The measuring plate 20 is pressed onto the product and positions the cover plate on the package in the product through the unit groove 21. The cover plate on the package is fixed by dispensing glue. The product is quickly positioned in the receiving cavity 12 of the base plate 10 by using the positioning pins 18. The measuring plate 20 is also accurately covered on the product by using the positioning pins 18, and each unit groove 21 corresponds to a cover plate, so that the cover plate is positioned and exposed through the unit groove. The dispensing glue and the pressing of the cover plate can be clearly observed by using a microscope. When the product is tested using the present application, since the cover plate and the glue around the cover plate, i.e. the measurement target, are directly exposed through the unit groove 21, the measurement window reference line of the microscope is basically in the same plane as the measurement target, thereby eliminating the measurement error and meeting the requirement that the product measurement accuracy is within 50μm.

[0023] If transparent plexiglass is used as the measuring plate, a grid consistent with the product needs to be drawn on the plexiglass, and a gasket needs to be added to the plexiglass to prevent glue from sticking to the plexiglass. When observing, the microscope needs to look through the plexiglass to observe the cover plate and glue under the plexiglass. On the one hand, since plexiglass itself is relatively thick, plexiglass of about 3mm is generally used to meet processing requirements. On the other hand, there is a gap of 3mm-4mm between the cover plate and the plexiglass. Therefore, when observing with a microscope, the different positions and angles of incident light will cause different measurement distances between the microscope and the cover plate, and the grid in the field of view will drift left and right relative to the plexiglass, which will cause visual errors, thus affecting the measurement accuracy. It cannot meet the testing requirements of products with a gluing and covering accuracy requirement of ±50μm.

[0024] In the present application, the measuring plate is made of stainless steel material, which improves the machinability of the measuring plate and ensures that an ultra-thin measuring plate can be processed. In addition, the stainless steel material is more solid, not easy to be damaged, and has high processing accuracy. At the same time, a window is directly opened on the measuring plate, that is, a unit groove is directly processed, so that the measurement target is directly exposed under the lens of the microscope. Even if the measurement target and the measurement window reference line of the microscope are on the same plane, visual and measurement errors are eliminated, and the measurement accuracy is improved, which can meet the product's measurement accuracy requirements within 50μm.

[0025] like Figure 1 As shown, the distance between the upper surface 11 of the bottom plate 10 and the bottom 13 of the accommodating cavity 12 is 3.5mm±0.5mm, that is, the depth of the accommodating cavity 12 is 3.5mm±0.5mm; the thickness of the measuring plate 20 is 0.3mm±0.05mm. In order to prevent the problem of viewing position drift during measurement, a very thin measuring plate 20 is used. The thickness of the measuring plate 20 is only about 0.3mm. At the same time, the measuring plate 20 is directly grooved to form a unit groove 21, so that the cover plate and the glue directly protrude from the measuring plate 20, which is convenient for direct observation with a microscope. Since the thickness of the measuring plate 20 is reduced and the measuring plate 20 is directly attached to the product, the depth of the accommodating cavity 12 on the bottom plate 10 can be further reduced to about 3.5mm, which reduces the distance to take out the measuring plate after taking out the product after dispensing glue, making it more convenient to take out the product and not easy to scratch the product glue.

[0026] Optionally, the size of the unit groove 21 is larger than the size of the cover plate, and the cover plate protrudes from the upper surface of the measuring plate 20. The size of the unit groove 21 is larger than the size of the cover plate to ensure that the cover plate and the glue under the cover plate are completely exposed from the unit groove 21; since the measuring plate 20 is very thin, the cover plate protrudes from the upper surface of the measuring plate 20, and the measuring plate does not cause any interference to the microscope observation.

[0027] like Figure 3As shown, the unit slot 21 is a square slot, the side length of the unit slot 21 is 1.6mm±0.2mm, the upper surface of the cover plate is square, and the side length of the upper surface of the cover plate is 0.8mm±0.1mm. Optionally, the cover plate is a flat rectangular structure. The size of each package is 2*2mm, the size of the cover plate on the package is 0.8*0.8mm, the size of the glue point under the cover plate is about 0.9mm, and the size of the glue point when the cover plate is pressed is about 1.2mm. The equipment accuracy is ±0.05mm. Taking redundancy into full consideration, the size of the unit slot 21 is set to 1.6*1.6mm to ensure that even if there is a small deviation in the glue point, the glue that is dispensed will not collide with the measuring plate during the measurement process and cause the measuring plate to be contaminated, so that the measuring plate needs to be constantly cleaned, and it is also ensured that the cover plate and the glue point under the cover plate can be exposed from the unit slot 21, which is convenient for microscopic observation of the glue point of the package and the pressing of the cover plate.

[0028] like Figure 3 As shown, the distance between two adjacent unit grooves 21 is 0.6 mm ± 0.2 mm, and a connecting strip 24 is provided between two adjacent unit grooves 21. The distance between the unit grooves 21 is set according to the size of the package body to ensure that all the cover plates can be exposed through the unit grooves 21.

[0029] like Figure 1 and Figure 2 As shown, the base plate 10 is provided with a first positioning hole 16, the measuring plate 20 is provided with a second positioning hole 23, the product is provided with a third positioning hole, the positioning pin 18 is fixed in the first positioning hole 16, and the positioning pin 18 passes through the third positioning hole and the second positioning hole 23 in sequence to position and fix the product and the measuring plate 20 on the base plate 10. Positioning holes are designed on the base plate 10, the product and the measuring plate 20, and finally the three are positioned and fixed by the positioning pin 18, so as to achieve fast and accurate positioning.

[0030] like Figure 1 and Figure 3 As shown, the corner end of the measuring plate 20 is provided with a protrusion 22, and the bottom plate 10 is provided with a positioning groove 15, and the protrusion 22 is placed in the positioning groove 15. During assembly, the protrusion 22 on the measuring plate 20 is aligned with the positioning groove 15 on the bottom plate 10, which can be quickly assembled and positioned.

[0031] like Figure 1As shown, the edge of the bottom plate 10 is provided with a notch 17, the product at least covers part of the notch 17, and a through slot 14 is provided on the bottom 13 of the accommodating cavity 12. The notch 17 is designed to facilitate the placement of a clamp or a finger when placing the product, and the through slot 14 is designed to facilitate the removal of the product. The four edges of the accommodating cavity 12 are chamfered to facilitate the product to slide into the accommodating cavity 12; therefore, it is convenient to take and place the product, and the efficiency of measurement is improved.

[0032] During the test, the base plate 10 is placed on the test platform, and then the product to be tested is placed in the accommodating cavity 12 of the base plate 10, the bottom surface of the product is attached to the bottom 13 of the accommodating cavity 12, the positioning pin 18 passes through the third positioning hole on the product, and the product is quickly positioned, and then the measuring board 20 is placed on the product, the bottom surface of the measuring board 20 is attached to the upper surface of the product, the positioning pin 18 passes through the second positioning hole 23, and the measuring board 20 is quickly positioned. Each package on the product corresponds to the unit groove 21 on the measuring board 20 one by one, and the cover plate and glue on the package are located in the unit groove 21. Finally, a microscope is used to directly observe the cover plate in the unit groove 21 and the glue under the cover plate, thereby completing the product's glue dispensing and cover sticking inspection.

[0033] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these modifications and improvements are all within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the attached claims.

Claims

1. A QFN dispensing cover product measurement fixture, characterized by: The invention comprises a bottom plate (10) and a measuring plate (20), wherein the bottom plate (10) is provided with a receiving cavity (12) for placing a product, wherein a positioning pin (18) is provided in the receiving cavity (12), wherein a plurality of unit grooves (21) are provided in the measuring plate (20), wherein a plurality of packaging bodies are provided on the product, wherein each of the packaging bodies is provided with a cover plate, wherein during testing, the product is placed in the receiving cavity (12), the measuring plate (20) covers the product, and the cover plate is located in the unit groove (21), wherein the product and the measuring plate (20) are fixed by the positioning pin (18), and wherein the material of the measuring plate (20) comprises stainless steel.

2. The QFN dispensing cover product measuring jig according to claim 1 is characterized by: The distance between the upper surface (11) of the bottom plate (10) and the bottom (13) of the accommodating cavity (12) is 3.5 mm±0.5 mm, and the thickness of the measuring plate (20) is 0.3 mm±0.05 mm.

3. The QFN dispensing cover product measuring jig according to claim 1 is characterized by: The size of the unit groove (21) is larger than the size of the cover plate, and the cover plate protrudes from the upper surface of the measuring plate (20).

4. The QFN dispensing cover product measuring jig according to claim 3 is characterized by: The unit groove (21) is a square groove, and the side length of the unit groove (21) is 1.6 mm±0.2 mm. The upper surface of the cover plate is square, and the side length of the upper surface of the cover plate is 0.8 mm±0.1 mm.

5. The QFN dispensing and capping product measuring jig according to claim 3 is characterized by: The distance between two adjacent unit grooves (21) is 0.6 mm±0.2 mm, and a connecting strip (24) is provided between two adjacent unit grooves (21).

6. The QFN dispensing cover product measuring jig according to claim 1, characterized in that: The base plate (10) is provided with a first positioning hole (16), the measuring plate (20) is provided with a second positioning hole (23), the product is provided with a third positioning hole, the positioning pin (18) is fixed in the first positioning hole (16), and the positioning pin (18) passes through the third positioning hole and the second positioning hole (23) in sequence, so as to position and fix the product and the measuring plate (20) on the base plate (10).

7. The QFN dispensing cover product measuring jig according to claim 1, characterized in that: A convex block (22) is provided at a corner end of the measuring plate (20), a positioning groove (15) is provided on the bottom plate (10), and the convex block (22) is placed in the positioning groove (15).

8. The QFN dispensing cover product measuring jig according to claim 1, characterized in that: The edge of the bottom plate (10) is provided with a notch (17), the product at least covers a portion of the notch (17), and a through groove (14) is provided on the bottom (13) of the accommodating cavity (12).

Images