Positioning jig

Abstract

The utility model discloses a positioning jig, which is used for positioning an electronic device on a substrate, at least one positioning area is defined by the positioning jig, the positioning jig is provided with a first positioning surface, a second positioning surface and a third positioning surface, the first positioning surface is arranged on one side of the positioning jig along the thickness direction and surrounds the positioning area, and the second positioning surface is arranged on the other side of the positioning jig along the thickness direction and surrounds the third positioning surface. The second positioning surface is positioned in the positioning area and is used for positioning the surface of the electronic device; and the third positioning surface is positioned in the positioning area and is used for positioning the periphery of the electronic device. According to the positioning jig provided by the embodiment of the utility model, the electronic device can be positioned by utilizing the plurality of positioning surfaces, so that the electronic device can be stably positioned on the substrate.

Description

Technical Field

[0001] The utility model relates to the technical field of welding jigs, in particular to a positioning jig. Background Art

[0002] HPD is a very compact IGBT power module (i.e. Insulated Gate Bipolar Transistor, IGBT). HPD modules produced in related technologies require welding jigs to limit the position during the welding process between the heat sink and the direct copper bond (DBC). During the DBC welding process, the solder will generate a large tension during the melting process, driving the DBC to shift, so that the two DBCs clamp the welding jig stopper bar. When disassembling, the stress acts on the DBC ceramic, causing defects such as DBC ceramic chipping. Utility Model Content

[0003] One purpose of the utility model is to provide a positioning fixture, which can use multiple positioning surfaces to position an electronic device, so as to stably position the electronic device on a substrate.

[0004] According to the positioning jig of the embodiment of the utility model, the electronic device is positioned on the substrate, and the positioning jig defines at least one positioning area. The positioning jig has a first positioning surface, a second positioning surface and a third positioning surface. The first positioning surface is arranged on one side of the positioning jig along the thickness direction and surrounds the positioning area; the second positioning surface is located in the positioning area and is used to position the surface of the electronic device; the third positioning surface is located in the positioning area and is used to position the periphery of the electronic device.

[0005] According to the positioning fixture of the embodiment of the utility model, multiple positioning surfaces can be used to position the electronic device, so as to stably position the electronic device on the substrate.

[0006] In addition, the positioning fixture according to the above embodiment of the utility model may also have the following additional technical features:

[0007] In some embodiments, the positioning fixture includes a positioning convex rib, and the positioning convex rib protrudes from the first positioning surface to form a gap between the first positioning surface and the substrate.

[0008] In some embodiments, the positioning rib includes a first rib, a positioning hole is provided on the first positioning surface, and the first rib is arranged around the positioning hole; and / or, the positioning rib includes a second rib, and the second rib extends along the circumference of the positioning jig; and / or, the positioning rib includes a third rib, and the third rib extends along the positioning jig from the inside to the outside and / or, the positioning jig is configured as a rectangle, and at least one of the four corners and four sides of the positioning jig is provided with at least one of the positioning ribs.

[0009] In some embodiments, the second positioning surface is recessed relative to the first positioning surface so that at least a portion of the electronic device is accommodated in the positioning area; and / or at least one second positioning surface has an avoidance gap for avoiding structural parts on the electronic device.

[0010] In some embodiments, the third positioning surface is configured as a cylindrical surface extending along the thickness direction and protruding in the middle portion along the circumference of the positioning area.

[0011] In some embodiments, the third positioning surface has a first inclined surface protruding from the second positioning surface along the thickness direction, and the first inclined surface is configured to be inclined toward the outside of the positioning area in a direction away from the first positioning surface along the thickness direction.

[0012] In some embodiments, the second positioning surface includes a plurality of surfaces arranged at intervals along the circumference of the positioning zone; and / or the third positioning surface includes a plurality of surfaces arranged at intervals along the circumference of the positioning zone; and / or the second positioning surface and the third positioning surface are staggered in the circumferential direction of the positioning zone.

[0013] In some embodiments, the positioning area is configured as a square, wherein the corners of the positioning area have the second positioning surface; and / or the sides of the positioning area have the third positioning surface.

[0014] In some embodiments, the positioning fixture includes a positioning frame, the positioning frame constructs the first positioning surface along the side surface of the thickness direction, and the positioning area is located on the inner side of the positioning frame.

[0015] In some embodiments, the positioning fixture further includes a positioning plate portion, which is disposed on an inner side of the positioning frame, and the second positioning surface is constructed on a side surface of the positioning plate portion along the thickness direction.

[0016] In some embodiments, the positioning fixture further includes a positioning protrusion, which is disposed on the inner side of the positioning frame, and a surface of the positioning protrusion facing the interior of the positioning area forms the third positioning surface.

[0017] In some embodiments, the positioning protrusion protrudes from the first positioning surface along the thickness direction, so as to form a gap between the first positioning surface and the substrate.

[0018] In some embodiments, the positioning frame includes a frame body and positioning ribs, the inner side of the frame body is configured as a placement space, the positioning ribs are connected to the frame body and extend toward the placement space, and are used to divide the placement space into a plurality of positioning areas.

[0019] In some embodiments, the positioning rib has a second inclined surface protruding from the second positioning surface along the thickness direction, and at least a portion of the second inclined surface is inclined toward the outside of the positioning area in a direction away from the second positioning surface along the thickness direction; and / or, the positioning rib includes at least one group, and each group includes two connected to opposite sides of the frame body and extending toward each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a positioning fixture according to an embodiment of the utility model.

[0021] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the area A in the middle circle.

[0022] Figure 3 It is a schematic diagram of the cooperation between a positioning fixture and an electronic device according to an embodiment of the utility model.

[0023] Figure 4 It is a schematic diagram of the cooperation between a positioning fixture, an electronic device and a substrate according to an embodiment of the utility model.

[0024] Figure 5 It is a schematic diagram of a positioning fixture according to another embodiment of the utility model.

[0025] Figure 6 It is a schematic diagram of a positioning fixture according to another embodiment of the utility model.

[0026] Figure 7 It is a schematic diagram of a positioning fixture according to another embodiment of the utility model.

[0027] Figure numerals: positioning fixture 100, positioning frame 11, frame body 111, positioning rib 112, positioning plate portion 12, positioning protrusion 13, first protruding rib 141, second protruding rib 142, third protruding rib 143, positioning area 101, first positioning surface 1021, second positioning surface 1022, third positioning surface 1023, first inclined surface 1031, second inclined surface 1032, avoidance gap 104, electronic device 200, substrate 300. DETAILED DESCRIPTION

[0028] HPD is a very compact IGBT power module (i.e. Insulated Gate Bipolar Transistor, IGBT), which provides a scalable power range of 100kW to 250kW in the 750V and 1200V levels for hybrid and electric vehicle traction applications. IGBT is a composite fully controlled voltage-driven power semiconductor device composed of a bipolar junction transistor (i.e. bipolar junction transistor, BJT) and a metal-oxide-semiconductor field-effect transistor (i.e. Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), which has the advantages of both the high input impedance of MOSFET and the low on-state voltage drop of power transistor (i.e. Giant Transistor, GTR). The production process of this module needs to go through a series of process flows such as reflow soldering, bonding and potting. The raw materials such as heat sink, copper-clad ceramic (i.e. Direct Copper Bond, DBC), and chip are combined in a certain way to finally form an overall package to achieve the desired use capacity. Reflow soldering is to melt and solder the heat sink, DBC and chip with tin.

[0029] Related Technology In the actual production of HPD modules, most of the soldering fixtures required for the reflow soldering process have the following problems when used:

[0030] 1. During the welding process between the heat sink and DBC, a welding jig is required to limit the position, but the contact surface between the welding jig and DBC is too large, which makes it easy to get stuck when disassembling after welding;

[0031] 2.During the welding process, the high temperature of DBC causes thermal expansion between DBC and the welding fixture, and a large stress occurs on the contact surface between the edge of DBC ceramic and the welding fixture, resulting in damage to DBC ceramic and product failure;

[0032] 3. During the DBC welding process, the solder will generate a large tension during the melting process, which will drive the DBC to shift, causing the two DBCs to clamp the welding fixture bar. During disassembly, stress acts on the DBC ceramics, causing defects such as chipping of the DBC ceramics.

[0033] In view of the shortcomings of the prior art, the utility model provides a positioning fixture for an HPD module, which solves the problem that during the use of the existing HPD module welding fixture, the contact area between the DBC and the welding fixture is too large, the risk of jamming during removal and the DBC ceramic chipping under stress, resulting in low packaging yield.

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] Combination Figures 1 to 4 According to the positioning jig 100 of the embodiment of the utility model, the electronic device 200 is positioned on the substrate 300. The positioning jig 100 defines at least one positioning area 101. The electronic device 200 can be placed in the positioning area 101. The positioning jig 100 has a first positioning surface 1021, a second positioning surface 1022 and a third positioning surface 1023. The first positioning surface 1021 is provided on one side of the positioning jig 100 along the thickness direction and surrounds the positioning area 101; the second positioning surface 1022 is located in the positioning area 101 and is used to position the surface of the electronic device 200; the third positioning surface 1023 is located in the positioning area 101 and is used to position the periphery of the electronic device 200. When using the positioning fixture 100 to position the electronic device 200, the positioning fixture 100 can be buckled on the substrate 300, wherein the electronic device 200 is arranged in the positioning area 101, the first positioning surface 1021 is opposite to the surface of the substrate 300, the electronic device 200 is positioned between the substrate 300 and the second positioning surface 1022, and the third positioning surface 1023 is positioned at the periphery of the substrate 300. The positioning fixture can be used to stably position the electronic device 200 on the substrate 300, facilitating the welding connection between the electronic device 200 and the substrate 300.

[0036] According to the positioning fixture 100 of the embodiment of the utility model, the positioning device can be connected to the substrate 300, the first positioning surface 1021 can be opposite to the substrate 300, the second positioning surface 1022 can position the electronic device 200 along the thickness direction, and the third positioning surface 1023 can position the periphery of the electronic device 200, so that the electronic device 200 can be positioned using multiple positioning surfaces, so as to stably position the electronic device 200 on the substrate 300, effectively improving the stability of the connection between the electronic device 200 and the substrate 300.

[0037] The substrate 300 in the present invention may be a heat sink or other structures, and the electronic device 200 may include electronic components, IGBT or HPD, etc. The present invention is mainly described by taking the substrate 300 as a heat sink and the electronic device 200 including HPD and DBC as examples, which is not a limitation on the protection scope of the present invention.

[0038] When the positioning fixture 100 of the present invention positions the electronic device 200 , the first positioning surface 1021 may be in contact with the substrate 300 , or a gap may be provided between the first positioning surface 1021 and the substrate 300 .

[0039] The third positioning surface 1023 in the utility model is a cylinder with four sides, forming an arc and chamfering, and the positioning rib 112 in the middle is chamfered to form a blocking limit for the DBC; the second positioning surface 1022 supports the DBC and avoids the DBC terminal; the first positioning surface 1021 is hollowed out to reduce the positioning area. The three positioning surfaces are different from the existing surface contact to point contact, so as to achieve the purpose of reducing the displacement and damage of the DBC.

[0040] like Figure 1 and Figure 2 , and combined with Figure 4 In some embodiments, the positioning fixture 100 includes a positioning convex rib, which protrudes from the first positioning surface 1021 and is used to provide a gap between the first positioning surface 1021 and the substrate 300. When the positioning device is installed on the substrate 300, the positioning convex rib abuts against the substrate 300, so that the first positioning surface 1021 can be separated from the substrate 300 by the positioning convex rib, so that there is a gap between the first positioning surface 1021 and the substrate 300, which can reduce the matching gap between the positioning fixture 100 and the substrate 300.

[0041] By using the positioning ribs, the first positioning surface 1021 and the substrate 300 can be hollowed out, wherein the positioning ribs can be used to reduce the contact surface between the positioning fixture 100 and the substrate 300. For example, the contact area can be reduced to 1% to 50% of the original; or the contact area can be reduced from 3342.5 square millimeters to 336.87 square millimeters, etc. By providing the positioning ribs, the relative stress and contact surface between the positioning fixture 100 and the DBC can be reduced.

[0042] In some embodiments, the positioning ribs include a first rib 141, a positioning hole is provided on the first positioning surface 1021, and the first rib 141 is arranged around the positioning hole. For example, during the assembly process of the electronic device 200 (such as HPD) and the substrate 300 (such as a heat sink), the positioning fixture 100 can be placed on the substrate 300 to be welded, and the positioning holes on the positioning fixture 100 are aligned with the holes on the substrate 300. A positioning column is placed thereon, which ensures the relative position of the positioning fixture 100 and the substrate 300. The fixing of the fixing column also ensures that there is no displacement between the electronic device 200 and the substrate 300. At the same time, the first rib 141 can provide support between the electronic device 200 and the substrate 300, thereby improving the stability when the electronic device 200 and the substrate 300 are positioned using the positioning column.

[0043] In some embodiments, the positioning ribs include second ribs 142, and the second ribs 142 extend along the circumference of the positioning jig 100. The stability of the cooperation between the positioning jig 100 and the substrate 300 at various locations along the circumference can be improved. The stable cooperation between the positioning jig 100 and the substrate 300 is ensured. Among them, a plurality of second ribs 142 can be provided on the positioning jig 100, and the plurality of second ribs 142 can be arranged at intervals along the circumference of the positioning jig 100. For example, the positioning jig 100 can be set in a square shape, and the four sides of the positioning jig 100 are provided with second ribs 142, and each side can be provided with at least one second rib 142. In addition, the second rib 142 can be provided on the outer side of the positioning jig 100, that is, the positioning jig 100 can be set in a ring shape with an inner side and an outer side, and the second rib 142 is provided close to the outer side of the positioning jig 100. In addition, in the following embodiments of the present invention, a positioning protrusion 13 is provided, and the positioning protrusion 13 can be provided on the inner side of the positioning fixture 100, and the positioning protrusion 13 can be provided to protrude from the first positioning surface 1021 of the positioning fixture 100. In this way, the second rib 142 and the positioning protrusion 13 can be used to support the inner and outer sides of the positioning fixture 100, thereby effectively improving the positioning stability between the positioning fixture 100 and the substrate 300.

[0044] In some embodiments, the positioning ribs include a third rib 143, and the third rib 143 extends from the inside to the outside of the positioning fixture 100. The positioning fixture 100 can achieve stability in cooperation with the substrate 300 from the inside to the outside. Among them, the aforementioned first rib 141 may include a first half and a second half, and the first half and the second half are arranged in a direction around the positioning hole, the first half is close to the positioning area 101 and the second half is far away from the positioning area 101; the third rib 143 may correspond to the first rib 141, and the third rib 143 may include a third half and a fourth half, the third half is connected to the first half and extends toward the positioning area 101, and the fourth half is connected to the second half and extends toward the outside of the positioning area 101.

[0045] In some embodiments, the positioning jig 100 is configured as a rectangle, and at least one positioning rib is provided at the four corners of the positioning jig 100. Optionally, a first rib 141 and a third rib 143 may be provided at the corners of the positioning jig 100. Alternatively, at least one positioning rib is provided at the four sides of the positioning jig 100. Optionally, a second rib 142 may be provided at the sides of the positioning jig 100. Of course, the positioning ribs on the positioning jig 100 may also be arranged in other ways. In addition, at least one positioning rib may be provided at the four corners of the positioning jig 100, and at least one positioning rib may be provided at the four sides of the positioning jig 100. Thus, a stable and uniform gap may be provided between the positioning jig 100 and the substrate 300, effectively improving the positioning stability of the positioning jig 100 on the electronic device 200.

[0046] In some embodiments, the second positioning surface 1022 is recessed relative to the first positioning surface 1021, so as to accommodate at least a portion of the electronic device 200 in the positioning area 101. Figures 1 to 3 , the thickness direction of the positioning fixture 100 is the up and down direction, or in other words, the thickness direction of the positioning fixture 100 is the Figure 3 In the direction perpendicular to the paper, the first positioning surface 1021 is located on the upper side of the positioning fixture 100, and the second positioning surface 1022 is recessed relative to the first positioning surface 1021, that is, the second positioning surface 1022 is lower than the first positioning surface 1021. By setting the second positioning surface 1022 to be recessed relative to the first positioning surface 1021, it is convenient to construct a receiving space in the positioning area 101, so as to stably place the electronic device 200 in the receiving space, and further improve the stability of the positioning of the electronic device 200. Of course, the second positioning surface 1022 can also be set to be flush with the first positioning surface 1021, which can also achieve the positioning of the electronic device 200.

[0047] In addition, if Figure 1 , the second positioning surface 1022 can be provided with an avoidance gap 104 for avoiding the structural parts on the electronic device 200. Among them, the second positioning surface 1022 in the utility model can include multiple, and the multiple second positioning surfaces 1022 can be provided with the avoidance gap 104, or a part of the multiple second positioning surfaces 1022 can be provided with the avoidance gap 104, and the other part can be provided without the avoidance gap 104. When the positioning fixture 100 is used to position the electronic device 200, the avoidance gap 104 can be used to avoid the structural parts to prevent the positioning fixture 100 from damaging the electronic device 200. Among them, the avoidance gap 104 can be provided on the inner side of the second positioning surface 1022, or the inner side edge of the avoidance gap 104 is configured to be a gap-shaped opening facing the center area of ​​the positioning area 101.

[0048] like Figure 1In some embodiments, the third positioning surface 1023 is configured to be a cylindrical surface extending in the thickness direction, and the third positioning surface 1023 is raised in the middle part of the circumference of the positioning area 101. When the third positioning surface 1023 is used to position the periphery of the electronic device 200, the matching area between the third positioning surface 1023 and the electrical device can be reduced to avoid over-positioning of the electronic device 200, and when the electronic device 200 expands after welding, it can also quickly fall off the positioning fixture 100. In addition, the third positioning surface 1023 can include multiple third positioning surfaces 1023, and the multiple third positioning surfaces 1023 can be arranged along the circumference of the positioning area 101, so that the positioning of the electronic device 200 can be achieved through the multiple third positioning surfaces 1023, avoiding the displacement of the electronic device 200 in the direction perpendicular to the thickness direction, and improving the positioning stability of the electronic device 200.

[0049] Furthermore, the third positioning surface 1023 is constructed in the shape of an arc surface, and the arc contact and the hollowing and chamfering of the position of the stop bar are used to reduce the contact area. After welding, the DBC corner position has less contact with the positioning fixture 100, reducing the risk of DBC chipping, thereby improving the yield.

[0050] In addition, if Figure 1 and Figure 2 The third positioning surface 1023 may be configured to have a first inclined surface 1031, and the first inclined surface 1031 may be configured to protrude from the second positioning surface 1022 in the thickness direction; in the direction away from the first positioning surface 1021 in the thickness direction, the first inclined surface 1031 is configured to be inclined toward the outside of the positioning area 101. In this way, when the periphery of the electronic device 200 is positioned by the third positioning surface 1023, the positioning jig 100 has different positioning dimensions for the electronic device 200 at different positions in the thickness direction. In this way, when the electronic device 200 is heated and expanded, the positioning of the electronic device 200 can be maintained, and the problem of stress concentration on the electronic device 200 can be avoided.

[0051] In some embodiments, the second positioning surface 1022 includes a plurality of second positioning surfaces 1022 arranged at intervals along the circumference of the positioning area 101. The plurality of second positioning surfaces 1022 can be used to achieve stable positioning of the electronic device 200. At the same time, the plurality of second positioning surfaces 1022 are arranged at intervals, so that the positioning area of ​​the second positioning surface 1022 for positioning the surface of the electronic device 200 can be reduced.

[0052] In addition, the third positioning surface 1023 includes a plurality of third positioning surfaces 1023 arranged at intervals along the circumference of the positioning area 101. The plurality of third positioning surfaces 1023 can be used to achieve stable positioning of the electronic device 200. At the same time, the plurality of third positioning surfaces 1023 are arranged at intervals, which can reduce the positioning area of ​​the third positioning surfaces 1023 for positioning the periphery of the electronic device 200.

[0053] The second positioning surface 1022 and the third positioning surface 1023 are staggered in the circumferential direction of the positioning area 101. This can improve the positioning effect and stability of the positioning fixture 100 on the electronic device 200, and at the same time can simplify the structure of the positioning fixture 100 and improve the structural stability and strength of the positioning fixture 100. In addition, when the second positioning surface 1022 and the third positioning surface 1023 are connected together, the arc-shaped transition structure at the connection point is prevented from affecting the positioning of the electronic device 200.

[0054] In some embodiments, the positioning area 101 is configured as a square, wherein the corner of the positioning area 101 has a second positioning surface 1022; or, the edge of the positioning area 101 has a third positioning surface 1023; or, the corner of the positioning area 101 has a second positioning surface 1022, and the edge of the positioning area 101 has a third positioning surface 1023, etc. Thus, the positioning stability of the positioning fixture 100 on the electronic device 200 can be improved. Optionally, a plurality of third positioning surfaces 1023 can be provided at the edge of the positioning area 101, wherein the positioning area 101 can have a first side, a second side and a third side, wherein the first side and the third side are opposite, the second side is connected to one side of the area between the first side and the second side, and the other side of the area between the first side and the second side is open, wherein the third positioning surfaces 1023 can be provided at both ends of the first side, respectively; the third positioning surfaces 1023 can be provided at both ends of the second side, respectively; the third positioning surfaces 1023 can be provided at both ends of the third side, respectively.

[0055] In some specific examples of the present invention, the third positioning surface 1023 can be set to be a cylinder with a radius dimension of 1.5 mm and a height dimension of 2 mm.

[0056] In addition, the cylinder of the first positioning surface 1021 may be asymmetrically chamfered at the bottom with a width dimension of 0.27 mm and a height dimension of 1 mm to form a first inclined surface 1031 .

[0057] like Figures 1 to 3 In some embodiments, the positioning fixture 100 includes a positioning frame 11, and the first positioning surface 1021 is configured on the side of the positioning frame 11 along the thickness direction, and the positioning area 101 is located inside the positioning frame 11. The inside of the positioning frame 11 is configured as a hollow structure, and when the electronic device 200 is stably positioned by the second positioning surface 1022 and the third positioning surface 1023, the matching area of ​​the positioning fixture 100 with the electronic device 200 can be reduced.

[0058] The positioning fixture 100 may further include a positioning plate portion 12, which is disposed on the inner side of the positioning frame 11, and a second positioning surface 1022 is constructed on one side surface of the positioning plate portion 12 along the thickness direction. Optionally, the other side surface of the positioning plate portion 12 may be flush with the surface of the positioning frame 11, wherein the surface faces away from the first positioning surface 1021. The positioning plate portion 12 may be used to achieve stable positioning of the electronic device 200.

[0059] The positioning fixture 100 may further include a positioning protrusion 13 , which is disposed on the inner side of the positioning frame 11 , and a surface of the positioning protrusion 13 facing the inside of the positioning area 101 forms a third positioning surface 1023 .

[0060] The positioning protrusion 13 protrudes from the first positioning surface 1021 along the thickness direction, so as to provide a gap between the first positioning surface 1021 and the substrate 300. The positioning protrusion 13 can be used to cooperate with the substrate 300 to construct a gap between the first positioning surface 1021 and the substrate 300. In combination with the above-mentioned embodiment, the cooperation between the positioning protrusion 13 and the first positioning protrusion 13 improves the support stability of the positioning frame 11.

[0061] like Figure 1 The positioning frame 11 includes a frame body 111 and positioning ribs 112. The inner side of the frame body 111 is configured as a placement space. The positioning ribs 112 are connected to the frame body 111 and extend toward the placement space to divide the placement space into a plurality of positioning areas 101. A plurality of positioning areas 101 can be configured inside the positioning frame 11, and a plurality of electronic devices 200 can be positioned at the same time, effectively improving the installation efficiency of the electronic devices 200.

[0062] In addition, the positioning rib 112 can be configured as a barrier strip with a width dimension of 2.2 mm, a length dimension of 3.65 mm, and a height dimension of 2 mm.

[0063] like Figure 1 In some embodiments, the positioning rib 112 has a second inclined surface 1032 protruding from the second positioning surface 1022 in the thickness direction, and at least a portion of the second inclined surface 1032 is inclined toward the outside of the positioning area 101 in the direction away from the second positioning surface 1022 in the thickness direction. The positioning rib 112 can be used to position the periphery of the electronic device 200, wherein the positioning of the electronic device around can be achieved by the combination of the third positioning surface 1023 and the positioning rib 112, effectively improving the positioning stability of the electronic device 200. In addition, the positioning rib 112 can stably separate the electronic devices 200 to ensure that there is a sufficient gap between adjacent electronic devices 200, so as to improve the operating stability of the electronic device 200. The bottom edge of the positioning rib 112 is asymmetrically chamfered with a width dimension of 0.27 mm and a height dimension of 1 mm to form the second inclined surface 1032.

[0064] In addition, the second positioning surface 1022 (or the positioning protrusion 13) can be set to have a length dimension of 6 mm, a width dimension of 6 mm, and a height dimension of 0.6 mm; the positioning plate portion 12 can also be set to have a length dimension of 7 mm, a width dimension of 5 mm, and a height dimension of 0.6 mm. In addition, the positioning plate portion 12 (or the positioning protrusion 13) can also be set with a avoidance notch 104 with a length dimension of 3 mm and a width dimension of 2 mm; the second positioning surface 1022 can also be set with a avoidance notch 104 with a length dimension of 4.5 mm and a width dimension of 1.5 mm.

[0065] The aforementioned height dimension may be a dimension in the thickness direction, the width dimension may be a radial dimension of the positioning area 101 , and the length dimension may be a circumferential dimension of the positioning area 101 .

[0066] In addition, the positioning ribs 112 include at least one group, and each group includes two ribs connected to opposite sides of the frame body 111 and extending toward each other. The positioning stability of the electronic device 200 can be improved, wherein each group of positioning ribs 112 includes a first rib and a second rib, the first rib is connected to one side of the frame body 111, and the second rib is connected to the other side of the frame body 111, the first rib and the second rib are opposite to each other and extend in opposite directions, and two adjacent positioning areas 101 are separated by the first rib and the second rib.

[0067] Some embodiments of the present invention are described below with reference to the accompanying drawings.

[0068] like Figure 5 In some optional embodiments, the positioning fixture 100 includes a frame body 111, a positioning plate portion 12 and a positioning protrusion 13. The frame body 111 surrounds the positioning area 101. The frame body 111 can be set to a rectangular shape, wherein at least two of the four corners of the frame body 111 are provided with positioning plates 12, and at least two of the four sides of the frame body 111 are provided with positioning protrusions 13. Among them, one side surface of the frame body 111 is configured as a first positioning surface 1021, and one side surface of the positioning plate portion 12 is configured as a second positioning surface 1022, and the second positioning surface 1022 is recessed compared to the first positioning surface 1021. When the positioning fixture 100 is used to position the electronic device 200, the electronic device 200 is supported on the second positioning surface 1022, and a plurality of positioning protrusions 13 can be provided around the periphery of the electronic device 200, so that the electronic device 200 is separated from the frame body 111 by the positioning protrusions 13 and the positioning plate portion 12, wherein the positioning protrusion 13 has a first inclined surface 1031, and the first inclined surface 1031 is opposite to the edge of the electronic device 200.

[0069] like Figure 6In some other optional embodiments, the positioning fixture 100 includes a frame body 111, a positioning rib 112, a positioning plate portion 12 and a positioning convex portion 13. The positioning rib 112 is connected to the inner side of the frame body 111 and is configured into two positioning areas 101 on the inner side of the frame body 111. The frame body 111 can be set to a rectangular shape. The positioning rib 112 can be configured into two rectangular positioning areas 101 on the inner side of the frame body 111, wherein at least two of the four corners of each positioning area 101 are provided with a positioning plate portion 12, and the positioning area 101 is composed of three sides of the frame body 111 and the positioning rib 112. Among them, the three sides of the frame body 111 that constitute the positioning area 101 are each provided with at least one positioning convex portion 13 to position the three sides of the electronic device 200; the positioning rib 112 can position the fourth side of the electronic device 200, so that the electronic device 200 is positioned by the combination of the positioning convex portion 13 and the positioning rib 112. In addition, the positioning protrusion 13 has a first inclined surface 1031 , and the positioning rib 112 has a second inclined surface 1032 .

[0070] like Figure 7 In some further optional embodiments, the positioning fixture 100 includes a frame body 111, positioning ribs 112, a positioning plate portion 12 and a positioning protrusion 13, the positioning ribs 112 are connected to the inner side of the frame body 111, and are configured into more than three positioning areas 101 on the inner side of the frame body 111, the frame body 111 can be set to a rectangular shape, the positioning ribs 112 can be configured into more than three rectangular positioning areas 101 on the inner side of the frame body 111, wherein at least two of the four corners of each positioning area 101 are provided with positioning plate portions 12, the positioning areas 101 located on both sides of the frame body 111 are composed of three side edges of the frame body 111 and the positioning ribs 112, and the positioning area 101 located in the middle area of ​​the frame body 111 is composed of two side edges of the frame body 111 and the positioning ribs 112.

[0071] The utility model relates to a positioning fixture 100 of an HPD module, wherein the third positioning surface 1023 of the DBC limit is subjected to arc and chamfer processing, the second positioning surface 1022 is subjected to avoidance processing, and the first positioning surface 1021 is subjected to hollowing processing, and the DBC limit function is played under a lower positioning area by adjusting the positions and size optimizations of the three positioning surfaces. The contact limit of the positioning fixture 100 reduces the positioning area of ​​the DBC and the positioning fixture 100 while having a limiting function, which is beneficial to the packaging of the module before welding and the separation and disassembly after welding, reduces the risk of DBC displacement and damage, and improves the packaging yield.

[0072] The positioning fixture 100 in the present invention can be set as an integrated fixture and can be formed by mechanical processing. The external dimensions of the positioning fixture 100 are consistent with the substrate 300 of the HPD module, and the hole size and position of the positioning hole are consistent with the hole position of the substrate 300 used by the HPD module. The substrate 300 and the positioning fixture 100 can be relatively fixed by a fixing column.

[0073] The inner side of the positioning fixture 100 is fixed in contact with the DBC using the cylindrical side surface and the positioning ribs 112 to achieve a relative position, and then the relative positions of the substrate 300, the positioning fixture 100 and the DBC are kept consistent.

[0074] The positioning rib 112 of the positioning fixture 100 is designed with an asymmetric chamfer to maintain the limit DBC while reducing the positioning area with the DBC. After welding is completed, when the positioning fixture 100 is pulled vertically upward, it is in linear contact with the DBC, and the stress between them is small.

[0075] Compared with the prior art, the beneficial effects of the utility model are:

[0076] 1. The positioning fixture 100 is used to fix the relative position of the heat sink through the fixing column. After the welding is completed, the DBC and the heat sink are welded together. After removing the fixing columns on both sides, the positioning fixture 100 can be taken out vertically for easy disassembly. The operation is simple and convenient to use.

[0077] (2) The relative stress and positioning surface of the contact between the positioning fixture 100 and the DBC are small. The use of arc contact and hollowing and chamfering of the positioning rib 112 reduces the positioning area. After welding, the corners of the DBC have less contact with the fixture, reducing the risk of DBC corner chipping, thereby improving the yield rate.

[0078] See also Figures 1 to 7 The embodiment of the utility model provides a technical solution: a positioning fixture 100 for an HPD module, the integrated structure includes a positioning hole, an inner limiting column design and an inner positioning rib 112 design. Through the direct placement operation mode, it is convenient to install and disassemble, thereby improving the flexibility of use.

[0079] Soldering pieces and DBC are placed in sequence in the inner area of ​​the positioning fixture 100, and the limit surface is designed to maintain a gap of 0.1 mm-0.3 mm with the edge of the DBC, which can ensure that the soldering pieces and DBC can be easily placed and that they are not affected by thermal expansion and contraction during reflow soldering without being subjected to stress on each other.

[0080] After the welding of the positioning jig 100 is completed, the positioning column is removed first, and then the jig is taken out vertically. Since the solder tension during the welding process will cause the DBC to shift, it may contact with the positioning jig 100 and generate stress. The arc and chamfer design of the first positioning surface 1021 will break away from the contact in a line contact manner during the upward removal process even if it contacts the edge of the DBC, ensuring that the smaller positioning surface will not generate greater stress and can be taken out normally.

[0081] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0086] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A positioning fixture (100) for positioning an electronic device (200) on a substrate (300), characterized in that: The positioning jig (100) defines at least one positioning area (101), and the positioning jig (100) has a first positioning surface (1021), a second positioning surface (1022), and a third positioning surface (1023); the first positioning surface (1021) is arranged on one side of the positioning jig (100) along the thickness direction and surrounds the positioning area (101); the second positioning surface (1022) is located in the positioning area (101) and is used to position the surface of the electronic device (200); the third positioning surface (1023) is located in the positioning area (101) and is used to position the periphery of the electronic device (200).

2. The positioning fixture (100) according to claim 1, characterized in that: The positioning fixture (100) comprises a positioning convex rib, the positioning convex rib protruding from the first positioning surface (1021) and used to form a gap between the first positioning surface (1021) and the substrate (300).

3. The positioning fixture (100) according to claim 2, characterized in that: The positioning convex rib comprises a first convex rib (141), a positioning hole is provided on the first positioning surface (1021), and the first convex rib (141) is arranged around the positioning hole; And / or, the positioning convex rib includes a second convex rib (142), and the second convex rib (142) extends along the circumference of the positioning fixture (100); And / or, the positioning rib includes a third rib (143), and the third rib (143) extends from the inside to the outside of the positioning fixture (100); And / or, the positioning jig (100) is configured in a rectangular shape, and at least one of the four corners and four sides of the positioning jig (100) is provided with at least one positioning rib.

4. The positioning fixture (100) according to claim 1, characterized in that: The second positioning surface (1022) is recessed relative to the first positioning surface (1021) so as to accommodate at least a portion of the electronic device (200) in the positioning area (101); and / or at least one second positioning surface (1022) has an avoidance notch (104) for avoiding structural components on the electronic device (200).

5. The positioning fixture (100) according to claim 1, characterized in that: The third positioning surface (1023) is configured to be a cylindrical surface extending in the thickness direction and protruding in the middle of the circumference of the positioning area (101).

6. The positioning fixture (100) according to claim 1, characterized in that: The third positioning surface (1023) has a first inclined surface (1031) protruding from the second positioning surface (1022) along the thickness direction, and the first inclined surface (1031) is configured to be inclined outwardly of the positioning area (101) in a direction away from the first positioning surface (1021) along the thickness direction.

7. The positioning fixture (100) according to any one of claims 1 to 6, characterized in that: The second positioning surface (1022) includes a plurality of surfaces arranged at intervals along the circumference of the positioning area (101); and / or the third positioning surface (1023) includes a plurality of surfaces arranged at intervals along the circumference of the positioning area (101); and / or the second positioning surface (1022) and the third positioning surface (1023) are staggered in the circumferential direction of the positioning area (101).

8. The positioning fixture (100) according to any one of claims 1 to 6, characterized in that: The positioning area (101) is configured in a square shape, wherein the corners of the positioning area (101) have the second positioning surface (1022); and / or the edges of the positioning area (101) have the third positioning surface (1023).

9. The positioning fixture (100) according to any one of claims 1 to 6, characterized in that: The positioning fixture (100) comprises a positioning frame (11), the positioning frame (11) constructs the first positioning surface (1021) along the side surface in the thickness direction, and the positioning area (101) is located inside the positioning frame (11).

10. The positioning fixture (100) according to claim 9, characterized in that: The positioning fixture (100) further comprises a positioning plate portion (12), wherein the positioning plate portion (12) is arranged on the inner side of the positioning frame (11), and the second positioning surface (1022) is constructed on one side surface of the positioning plate portion (12) along the thickness direction.

11. The positioning fixture (100) according to claim 9, characterized in that: The positioning fixture (100) further comprises a positioning protrusion (13), wherein the positioning protrusion (13) is arranged on the inner side of the positioning frame (11), and the surface of the positioning protrusion (13) facing the interior of the positioning area (101) forms the third positioning surface (1023).

12. The positioning fixture (100) according to claim 11, characterized in that: The positioning protrusion (13) protrudes from the first positioning surface (1021) along the thickness direction, and is used to provide a gap between the first positioning surface (1021) and the substrate (300).

13. The positioning fixture (100) according to claim 9, characterized in that: The positioning frame (11) comprises a frame body (111) and positioning ribs (112); the inner side of the frame body (111) is configured as a placement space; the positioning ribs (112) are connected to the frame body (111) and extend toward the placement space to divide the placement space into a plurality of positioning areas (101).

14. The positioning fixture (100) according to claim 13, characterized in that: The positioning rib (112) has a second inclined surface (1032) protruding from the second positioning surface (1022) along the thickness direction, and in a direction away from the second positioning surface (1022) along the thickness direction, at least a portion of the second inclined surface (1032) is inclined toward the outside of the positioning area (101); And / or, the positioning ribs (112) include at least one group, and each group includes two ribs connected to opposite sides of the frame body (111) and extending towards each other.

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