Pressure welding pressure head structure

Abstract

The utility model discloses a pressure welding pressure head structure which comprises a display screen FPC, a backlight FPC and a pressure welding main body part used for pressure welding assembly, the display screen FPC is provided with a tin soldering part, the backlight FPC is provided with welding spots corresponding to the tin soldering part, each welding spot is provided with a via hole, the bottom end of the pressure welding main body part is fixedly connected with a pressure head, and the pressure head is fixedly connected with the display screen FPC. The bottom end of the pressure head is provided with a pressure welding surface, and the pressure welding surface is provided with a height limiting groove corresponding to the via hole. According to the pressure welding pressure head structure provided by the utility model, the height limiting groove is additionally formed in the pressure welding surface of the pressure head, liquid tin emerges from the via hole in the backlight FPC into the height limiting groove, the height of tin emerging from the via hole in the backlight FPC is limited, the problem that the tin emerging amount is too large and too thick is avoided, and the surface of the height limiting groove is coated with a layer of solder resist, so that the thickness of the liquid tin is reduced. And meanwhile, the two rows of via holes are better used for tin emission after pressure welding, so that the pressure welding reliability of a product is improved, and the welding quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure welding technical field especially relates to a pressure welding pressure head structure. BACKGROUND

[0002] The welding mode of the display module backlight pad of the mobile phone industry mainly has two kinds, namely, drag welding and pulse hot pressure welding, wherein, the drag welding is mainly completed by manual welding, the welding appearance consistency is poor, and the labor cost is higher, and the pulse hot pressure welding is also called hot pressure welding, which is completed by equipment and does not rely on manual work, for example, in the production process of some electronic equipment (such as mobile phones, computers and the like), the backlight FPC is usually welded with the display FPC through hot pressure welding, and then the backlight terminal supplies power. In the welding process, generally, the pressure head of the welding device is used to press the backlight terminal on the FPC gold finger, so that the backlight terminal is in contact with the tin material on the surface of the FPC gold finger, and then the pressure head is heated by electric pulse, so that the temperature rises to the melting point of tin, and the liquid tin is discharged from the through hole of the backlight terminal to the surface of the backlight terminal, so that the backlight terminal and the FPC gold finger are welded and fixed.

[0003] At present, the structure of the pressure head 111 on the pressure welding equipment is as shown in Figure 5 When the pressure head 111 is pressed on the backlight FPC 112, the bottom tin on the display screen FPC 113 is melted by pulse, and the solder tin is discharged from the through hole of the backlight FPC 112. Since the amount of the bottom tin on the display screen FPC 113 is difficult to keep consistent, when the bottom tin is thick, the amount of the tin discharged from the through hole is too much, which leads to the thickness of the tin discharge position exceeding the standard, and affects the quality of the welding. UTILITY MODEL CONTENTS

[0004] Therefore, it is necessary to provide a pressure welding pressure head structure aiming at the above technical problems, by increasing the height limiting groove at the pressure welding surface of the pressure head, the depth of the height limiting groove is the height of the product structure allowed to discharge tin, when the pressure head is pressed on the backlight FPC for pressure welding, the temperature rises to the melting point of the tin on the solder tin part of the display screen FPC, at this time, the liquid tin is discharged from the through hole of the backlight FPC to the height limiting groove, so that the height of the tin discharge from the through hole of the backlight FPC can be limited by the height limiting grooves on both sides, the problems of too much and thick tin discharge are avoided, and a layer of solder resist is coated on the surface of the height limiting groove to prevent the tin on the inner wall of the height limiting groove from affecting the use, and the number of the height limiting grooves is set to two, the through holes on the backlight FPC are made into two rows, and the two rows of through holes are better used for tin discharge after pressure welding, so as to improve the pressure welding reliability of the product and improve the quality of the welding.

[0005] In order to solve the above technical problems, the utility model adopts the technical scheme as follows:

[0006] A pressure welding pressure head structure comprises:

[0007] The utility model provides a display screen FPC, backlight FPC and the pressure welding main part for pressure welding assembly, be provided with the soldering tin part on the display screen FPC, be provided with the soldering point corresponding with soldering tin part on the backlight FPC, every soldering point is all seted up via hole, the bottom fixedly connected with pressure head of pressure welding main part, the bottom of pressure head has pressure welding surface, and the pressure welding surface is seted up with the high limit groove corresponding with via hole.

[0008] Further, the pressure head is made of molybdenum alloy material.

[0009] Further, the number of high limit grooves is two, and the number of via holes on each soldering point is two.

[0010] Further, the inner wall of the high limit groove is coated with a layer of solder resist for preventing tin on the inner wall of the high limit groove from affecting use.

[0011] Further, the width of the high limit groove is greater than the diameter of the via hole, and the depth of the high limit groove is 0.08-0.15 mm.

[0012] Further, the pressure welding main part is provided with a slot and four holes, the slot is used for placing a thermocouple wire, and the four holes are used for fixing to a pressure welding device.

[0013] Further, the pressure head is flush with the front and back sides of the pressure welding main part, and the top end of the pressure head gradually decreases towards the pressure welding surface.

[0014] Further, the pressure welding main part and the pressure head are an integral structure.

[0015] Further, the inner top wall of the high limit groove is in a circular arc structure.

[0016] Further, the bottom end of the pressure welding main part is fixedly connected with a connecting part, the top end of the pressure head is provided with a mounting groove, the connecting part is arranged in the mounting groove and fixed by a screw.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The pressure welding head structure provided by the utility model has the following advantages: the threaded hole corresponding to the screw is arranged on the connecting part, the connecting part is smeared with heat-conducting silicone grease when the pressure welding main part and the pressure head are assembled, the mounting groove on the pressure head is sleeved on the connecting part, the screw is connected with the threaded hole on the connecting part, the pressure head and the pressure welding main part are fixed together, the heat-conducting silicone grease enables the pressure welding main part and the pressure head to quickly conduct heat, and when the pressure head needs to be replaced, the new pressure head can be replaced only by disassembling the screw, without the need to replace the pressure welding main part as a whole, so that the use cost is reduced.

[0019] The pressure welding pressure head structure provided by the utility model has the advantages that the height-limiting grooves are added to the pressure welding surface of the pressure head, the depth of the height-limiting grooves is the height allowed for tin to overflow on the product structure, when the pressure head is pressed on the backlight FPC for pressure welding, the temperature rises to make the tin at the soldering tin part on the display screen FPC melt, at this time, the liquid tin overflows from the via holes of the backlight FPC into the height-limiting grooves, thereby the height-limiting grooves on the two sides can limit the height of the tin overflow from the via holes on the backlight FPC, the problem of too much and too thick tin overflow is avoided, and a layer of solder resist is coated on the surface of the height-limiting grooves to prevent the tin on the inner wall of the height-limiting grooves from affecting use, meanwhile, the number of the height-limiting grooves is set to two, the via holes on the backlight FPC are made into two rows, and the two rows of via holes are better used for tin overflow after pressure welding, thereby the pressure welding reliability of the product is improved, and the welding quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic view of the pressure welding pressure head structure provided by the utility model;

[0021] Figure 2 It is a three-dimensional schematic view of the pressure welding pressure head structure provided by the utility model; Figure 1 It is an enlarged schematic view of the position A in the above figure;

[0022] Figure 3 It is a sectional schematic view of the pressure welding pressure head structure provided by the utility model;

[0023] Figure 4 It is an installation schematic view of the pressure head of the pressure welding pressure head structure provided by the utility model;

[0024] Figure 5 It is a structural schematic view of the prior pressure welding pressure head provided by the utility model.

[0025] The figure mark is explained as follows:

[0026] 1, display screen FPC; 2, backlight FPC; 3, soldering tin part; 4, soldering point; 5, via hole; 6, pressure welding main part; 7, pressure head; 8, pressure welding surface; 9, height-limiting groove; 10, solder resist; 601, slot; 602, hole; 603, connecting part; 604, installation groove; 605, screw. DETAILED DESCRIPTION

[0027] In order for the personnel in the technical field to better understand the utility model scheme, the technical scheme in the utility model embodiments will be clearly and completely described below in combination with the drawings in the utility model embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the personnel in the field without creative labor should belong to the protection scope of the utility model.

[0028] As described in the background, when the pressure head of the current pressure welding equipment is pressed on the backlight FPC, solder will come out of the via hole of the backlight FPC. Since the amount of bottom solder on the display screen FPC is difficult to maintain consistency, when the bottom solder is too thick and the amount of solder coming out of the via hole is too much, it will cause the thickness of the soldering position to exceed the standard, affecting the welding quality.

[0029] To solve this technical problem, the utility model provides a kind of pressure welding pressure head structure, by increasing limit high groove 9 at the pressure welding surface 8 of pressure head 7, the depth of limit high groove 9 is the height allowed to solder on product structure, when pressure head 7 is pressed on the backlight FPC 2 and pressure welding when using, temperature rises to make the tin of soldering part 3 on display screen FPC 1 melt, at this time, liquid tin comes out from the via hole 5 of backlight FPC and goes into limit high groove 9, so that the height of soldering of via hole 5 on backlight FPC 2 can be limited by limit high groove 9 on both sides, avoid the problem of too much and thick soldering, and a layer of solder resist 10 is coated on the surface of limit high groove 9, to prevent the tin on the inner wall of limit high groove 9 from affecting use, while the number of limit high groove 9 is set to two, the via hole 5 on backlight FPC 2 is made into two rows, and the two rows of via holes 5 are better used for soldering after soldering, to improve the pressure welding reliability of product and improve the quality of welding.

[0030] Specifically, please refer to Figures 1-4 , the pressure welding pressure head structure specifically includes:

[0031] Display screen FPC 1 and backlight FPC 2, soldering part 3 is provided on display screen FPC 1, and soldering point 4 corresponding to soldering part 3 is provided on backlight FPC 2, and via hole 5 is formed on each soldering point 4;

[0032] Pressure welding main part 6 for pressure welding assembly, pressure head 7 is fixedly connected to the bottom end of pressure welding main part 6, the bottom end of pressure head 7 has pressure welding surface 8, limit high groove 9 corresponding to via hole 5 is formed on pressure welding surface 8, and the depth of limit high groove 9 is the height allowed to solder on product structure.

[0033] The pressure welding pressure head structure provided by the utility model increases limit high groove 9 at the pressure welding surface 8 of pressure head 7, the depth of limit high groove 9 is the height allowed to solder on product structure, when pressure head 7 is pressed on the backlight FPC 2 and pressure welding when using, temperature rises to make the tin of soldering part 3 on display screen FPC 1 melt, at this time, liquid tin comes out from the via hole 5 of backlight FPC and goes into limit high groove 9, so that the height of soldering of via hole 5 on backlight FPC 2 can be limited by limit high groove 9 on both sides, avoid the problem of too much and thick soldering, and a layer of solder resist 10 is coated on the surface of limit high groove 9, to prevent the tin on the inner wall of limit high groove 9 from affecting use, while the number of limit high groove 9 is set to two, the via hole 5 on backlight FPC 2 is made into two rows, and the two rows of via holes 5 are better used for soldering after soldering, to improve the pressure welding reliability of product.

[0034] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings.

[0035] It should be noted that the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0036] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] Please refer to Figures 1-4 A pressure welding pressure head structure includes a display screen FPC1 back light FPC2 and a pressure welding main body part 6 for pressure welding assembly, the display screen FPC1 is provided with a soldering part 3, the back light FPC2 is provided with a soldering point 4 corresponding to the soldering part 3, a via hole 5 is formed on each soldering point 4, the bottom end of the pressure welding main body part 6 is fixedly connected with a pressure head 7, the bottom end of the pressure head 7 has a pressure welding surface 8, the pressure welding surface 8 is provided with a height limiting groove 9 corresponding to the via hole 5, and the depth of the height limiting groove 9 is the height allowed to have tin on the product structure.

[0038] The pressure welding pressure head structure provided by the embodiment increases the height limiting groove 9 at the pressure welding surface 8 of the pressure head 7, the depth of the height limiting groove 9 is the height allowed to have tin on the product structure, when the pressure head 7 is pressed on the back light FPC2 for pressure welding, the temperature rises to melt the tin at the soldering part 3 on the display screen FPC1, at this time, the liquid tin is poured from the via hole 5 at the back light FPC into the height limiting groove 9, so that the height limiting groove 9 on both sides can limit the height of the tin poured from the via hole 5 on the back light FPC2, thereby avoiding the problem of too much and thick tin pouring, and a layer of solder resist 10 is coated on the surface of the height limiting groove 9 to prevent the tin on the inner wall of the height limiting groove 9 from affecting use, and the number of height limiting grooves 9 is set to two, the via holes 5 on the back light FPC2 are made into two rows, and the two rows of via holes 5 are better used for tin pouring after pressure welding, thereby improving the pressure welding reliability of the product and improving the quality of welding.

[0039] The pressure welding pressure head structure provided by the embodiment is further optimized, specifically, the pressure head 7 is made of molybdenum alloy material, of course, the pressure welding main body part 6 can also be made of molybdenum alloy material, the molybdenum alloy has good heat conductivity, electrical conductivity and low expansion coefficient, and exhibits high strength at high temperature, becoming an ideal material for working in high temperature environment, in addition, the processing performance of the molybdenum alloy is relatively good, and the pressure head 7 is more convenient to manufacture.

[0040] As Figures 1-3As shown, the number of height-limiting grooves 9 is two, the number of through holes 5 on each soldering point 4 is two, the inner wall of the height-limiting groove 9 is coated with a layer of solder resist 10, and the solder resist 10 is used to prevent tin on the inner wall of the height-limiting groove 9 from affecting use.

[0041] The components of the solder resist 10 include various chemicals such as resin, solvent, filler, and pigment, and the coating is generally performed by spraying, brushing, or rolling, and attention should be paid to controlling the thickness of the coating so as not to affect the normal operation of the height-limiting groove 9.

[0042] Further optimization is made to the structure of the press-bonding pressure head provided in Embodiments 1 or 2, as shown in Figures 2-3 As shown, the width of the height-limiting groove 9 is greater than the diameter of the through hole 5, and the depth of the height-limiting groove 9 is 0.08-0.15 mm.

[0043] The press-bonding main body 6 is provided with a slot 601 and four openings 602, the slot 601 is used to place a thermocouple wire, and the four openings 602 are used to be fixed to a press-bonding device, the four openings 602 can be threaded holes or through holes, so that screws can be used in cooperation with the four openings 602 or directly pass through the through holes to connect the press-bonding main body 6 and the body part of the hot-press bonding device, and no other additional mounting structure is arranged during installation, which not only saves material cost but also simplifies the installation and disassembly operation and is convenient for daily maintenance.

[0044] As shown in Figure 1 The pressure head 7 is flush with the front and rear sides of the press-bonding main body 6, the top end of the pressure head 7 gradually narrows towards the press-bonding surface 8, the press-bonding main body 6 and the pressure head 7 are an integral structure, and the structural strength between the entire press-bonding main body 6 and the pressure head 7 is ensured.

[0045] Further optimization is made to the structure of the press-bonding pressure head provided in the above embodiments, as shown in Figure 4 As shown, the inner top wall of the height-limiting groove 9 is in a circular arc structure, which can avoid stress concentration at the top of the height-limiting groove 9, effectively improve the product quality of the pressure head 7, and make the tin more beautiful after spitting.

[0046] The bottom end of the press-bonding main body 6 is fixedly connected with a connecting part 603, the top end of the pressure head 7 is provided with a mounting slot 604, the connecting part 603 is arranged inside the mounting slot 604 and is fixed by a screw 605.

[0047] The connecting portion 603 is provided with a threaded hole corresponding to the screw 605, and when the main body portion 6 and the pressure head 7 are assembled, the connecting portion 603 is coated with heat-conducting silicon grease, the mounting groove 604 of the pressure head 7 is sleeved on the connecting portion 603, the screw 605 is connected with the threaded hole of the connecting portion 603, the pressure head 7 and the main body portion 6 are fixed together, the heat-conducting silicon grease enables the main body portion 6 and the pressure head 7 to quickly conduct heat, and when the pressure head 7 needs to be replaced, the screw 605 is only needed to be disassembled, so that the new pressure head 7 can be replaced, and the main body portion 6 does not need to be replaced as a whole, so that the use cost is reduced.

[0048] The use process of the pressure head structure is as follows:

[0049] The height-limiting groove 9 is added at the pressure welding surface 8 of the pressure head 7, the depth of the height-limiting groove 9 is the height of the tin allowed on the product structure, when the pressure head 7 is pressed on the backlight FPC 2 for pressure welding, the temperature rises to melt the tin at the soldering tin part 3 of the display screen FPC 1, at this time, the liquid tin is poured from the via hole 5 of the backlight FPC into the height-limiting groove 9, so that the height-limiting groove 9 on both sides can limit the tin pouring height of the via hole 5 on the backlight FPC 2, and the problem of too much and thick tin pouring is avoided, and a layer of solder resist 10 is coated on the surface of the height-limiting groove 9 to prevent the tin on the inner wall of the height-limiting groove 9 from affecting use, and the number of the height-limiting groove 9 is set to two, the via hole 5 on the backlight FPC 2 is made into two rows, and the two rows of via holes 5 are better used for tin pouring after pressure welding, so that the pressure welding reliability of the product is improved, and the welding quality is improved.

[0050] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection or each other can communicate;Can be directly connected, also can be indirectly connected through intermediate medium, can be the communication or the interaction relationship of two elements of two elements, unless another definite limitation. For ordinary skilled in the art, the above terms can be understood according to the specific meaning of the utility model.

[0051] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments, and the preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A structure of a press-bonding press head characterized by comprising: It includes: The display screen FPC (1) is provided with a soldering part (3), and the backlight FPC (2) is provided with a soldering point (4) corresponding to the soldering part (3), and a via hole (5) is formed in each soldering point (4); A pressure welding main body (6) for pressure welding assembly, the bottom end of the pressure welding main body (6) is fixedly connected with a pressure head (7), the bottom end of the pressure head (7) has a pressure welding surface (8), and the pressure welding surface (8) is provided with a height limiting groove (9) corresponding to the via hole (5).

2. The bonding press head structure according to claim 1, characterized by, The pressure head (7) is made of molybdenum alloy material.

3. The bonding press head structure according to claim 1, characterized by, The number of the height limiting groove (9) is two, and the number of the via hole (5) on each soldering point (4) is two.

4. The bonding press head structure according to claim 1, characterized by, The inner wall of the height limiting groove (9) is coated with a layer of solder resist (10), which is used to prevent the tin on the inner wall of the height limiting groove (9) from affecting the use.

5. The bonding press head structure according to claim 1, characterized by, The width of the height limiting groove (9) is greater than the diameter of the via hole (5), and the depth of the height limiting groove (9) is 0.08-0.15mm.

6. The bonding press head structure according to claim 1, characterized by, The pressure welding main body (6) is provided with a slot (601) and four holes (602), the slot (601) is used to place a thermocouple wire, and the four holes (602) are used to fix to the pressure welding equipment.

7. The swaging ram structure of claim 6 wherein, The pressure head (7) is flush with the front and back sides of the pressure welding main body (6), and the top end of the pressure head (7) gradually narrows towards the pressure welding surface (8).

8. The swaging ram structure of claim 7, wherein The pressure welding main body (6) and the pressure head (7) are an integral structure.

9. The bonding press head structure according to claim 1, characterized by, The inner top wall of the height limiting groove (9) is a circular arc structure.

10. The swaging ram structure of claim 9, wherein The bottom end of the pressure welding main body (6) is fixedly connected with a connecting part (603), the top end of the pressure head (7) is provided with a mounting groove (604), the connecting part (603) is arranged in the mounting groove (604) and is fixed by a screw (605).

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