COB welding-free structure

Abstract

The utility model relates to the technical field of light source devices, in particular to a COB (Chip On Board) welding-free structure, which comprises a bracket, a light source and a circuit board, and is characterized in that two metal points are arranged on one side of the circuit board and are respectively used for propping against the positive electrode and the negative electrode of the light source; the top plate is provided with a fixing assembly; the two protruding metal points are arranged on the circuit board, the metal points make contact with the positive electrode and the negative electrode of the light source so that power can be supplied to the light source, meanwhile, in order to ensure that the light source can make close contact with the metal points, the fixing assembly is arranged on the support, and the circuit board can make contact with the light source more firmly through the fixing assembly; therefore, the possibility of separating metal points from the light source is reduced and the normal power supply function of the light source is ensured. According to the utility model, a light source power supply mode without welding and elastic sheets can be realized, the assembly structure is simple, the production efficiency can be effectively improved, the use of the elastic sheets is reduced, and the production cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of light source devices, in particular to a COB solder-free structure. Background Art

[0002] In the field of modern lighting, COB (Chip On Board) light sources have become a popular choice for LED lighting applications due to their advantages such as high brightness, high energy efficiency and long life. In order to adapt to the integrated characteristics of COB light sources, solder-free COB light source brackets have emerged to simplify the installation process and improve production efficiency. The solder-free COB light source brackets in the prior art usually adopt a shrapnel contact power supply solution, that is, a metal shrapnel is fixed on the bracket, and the deformation of the metal shrapnel is controlled to keep the metal shrapnel in contact with the positive and negative poles of the light source, and then connected to an external power supply through a terminal block, so as to realize the power supply of the light source.

[0003] For example, the wiring element for LED electrical connection disclosed in patent CN200810184925.0 is a solder-free design achieved by the structure of a spring. Although the solder-free COB light source bracket simplifies the installation process to a certain extent, its design still has several key limitations, as follows:

[0004] Assembly complexity: The existing design involves multiple independent components, including brackets, springs and terminals, which not only increases the complexity of assembly, but also increases production costs. In a large-scale production environment, this complexity may lead to low production efficiency. In addition, the production and assembly of metal springs requires manual participation, including the adjustment of the deformation of the metal springs, and it is impossible to achieve fully automated production, resulting in low production and assembly efficiency.

[0005] Number of parts and cost: The existence of multiple independent parts not only increases the difficulty of assembly, but also directly leads to increased costs. Additional parts mean more inventory management, higher procurement costs and more complicated logistics arrangements.

[0006] Contact reliability: The installation and fixation of the spring is a key link to ensure the stability of the circuit. Once the spring is not properly fixed or moves over time, it will directly lead to poor contact, affect the normal operation of the light source, and even cause circuit failure.

[0007] In view of the above problems, the design of the existing welding-free light source bracket still has much room for improvement in terms of convenience, stability and cost-effectiveness. Summary of the invention

[0008] In view of the problems of the prior art, the utility model provides a COB solder-free structure, which does not require the use of spring pieces and enables the light source to be powered without soldering by making the metal points of the circuit board closely contact with the positive and negative electrodes of the light source. The structure is simple and the assembly is more convenient.

[0009] In order to solve the above technical problems, the utility model adopts the following technical solutions: a COB solder-free structure, comprising a bracket, a light source and a circuit board, the circuit board being mounted on the bracket, the bracket comprising a top plate and a bottom plate detachably connected to the top plate, the bottom plate being provided with a light source groove for assembling the light source, the top plate being provided with a light hole for allowing the light source to leak out; two metal points are provided on one side of the circuit board, the two metal points are respectively used to contact the positive and negative poles of the light source to electrically connect the light source to the circuit board; the top plate is provided with a fixing component, the fixing component is used to contact the other side of the circuit board.

[0010] Preferably, the metal dots are tin dots.

[0011] Preferably, the metal dots are hemispherical in shape.

[0012] Preferably, the fixing assembly includes a plurality of spring buckles, one end of each spring buckle is fixed to the top plate, a gap is provided between the other end of each spring buckle and the top plate, and each spring buckle abuts against the other side of the circuit board.

[0013] Preferably, one end of the spring buckle is integrally connected to the top plate.

[0014] Preferably, the top plate is provided with a plurality of avoidance grooves, and the avoidance grooves are located below the spring buckles.

[0015] Preferably, the fixing assembly includes a plurality of springs, one end of each spring abuts against the top plate, and the other end of each spring abuts against the other side of the circuit board.

[0016] Preferably, the top plate is provided with a spring groove, and the spring is embedded in the spring groove.

[0017] Preferably, the circuit board is provided with connection terminals, the bottom plate is provided with terminal slots, and after the circuit board is assembled on the bracket, the connection terminals are assembled in the terminal slots.

[0018] Preferably, the light source slot is provided with four side walls, one of which is protrudingly provided with an arc-shaped limit protrusion, and the bottom plate is provided with a limit adjustment hole, and the limit adjustment hole is close to the side wall where the arc-shaped limit protrusion is provided so that the arc-shaped limit protrusion can move; the other three side walls are all protrudingly provided with fastening blocks, and the fastening blocks and the arc-shaped limit protrusions are both used to resist the light source.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a COB solder-free structure, which is provided with a circuit board. By providing two protruding metal points on the circuit board, the metal points are in contact with the positive and negative electrodes of the light source to realize power supply for the light source. At the same time, in order to ensure that the light source and the metal points can be in close contact, a fixing component is provided on the bracket, and the fixing component makes the circuit board and the light source more tightly contacted, thereby reducing the possibility of separation of the metal point and the light source, and ensuring the normal power supply function of the light source. The utility model can realize a solder-free and shrapnel-free light source power supply method, has a simple assembly structure, can effectively improve production efficiency, and reduces the use of shrapnel, which can reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The decomposition structure of the first embodiment of the present invention is shown in FIG. Figure 1 ;

[0022] Figure 2 The decomposition structure of the first embodiment of the present invention is shown in FIG. Figure 2 ;

[0023] Figure 3 It is a structural schematic diagram of the bottom plate of the utility model;

[0024] Figure 4 It is a cross-sectional view of the first embodiment of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the spring buckle of the utility model;

[0026] Figure 6 It is a cross-sectional view of the bottom plate of the utility model;

[0027] Figure 7 This is a schematic diagram of the exploded structure of the second embodiment of the present utility model;

[0028] Figure 8 It is a cross-sectional view of the second embodiment of the present utility model.

[0029] exist Figures 1 to 8 Reference numerals in the drawings include:

[0030] 1-light source, 2-circuit board, 3-top plate, 4-bottom plate, 5-light source slot, 6-light hole, 7-annular slot, 8-metal point, 9-spring buckle, 10-gap, 11-avoidance slot, 12-spring, 14-connecting terminal, 15-terminal slot, 16-side wall, 17-arc-shaped limiting protrusion, 18-limit adjustment hole, 19-fastening block, 20-positioning ridge, 21-mounting column, 22-mounting slot, 23-soldering pad. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings, and the contents mentioned in the implementation modes are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.

[0032] Embodiment 1:

[0033] This embodiment provides a COB solder-free structure, such as Figures 1 to 6 , including a bracket, a light source 1 and a circuit board 2, the circuit board 2 is installed on the bracket, the bracket includes a top plate 3 and a bottom plate 4 detachably connected to the top plate 3, the bottom plate 4 is provided with a light source groove 5 for assembling the light source 1, and the top plate 3 is provided with a light hole 6 for the light source 1 to leak out; two metal points 8 are provided on one side of the circuit board 2, and the two metal points 8 are respectively used to contact the positive and negative poles of the light source 1 to electrically connect the light source 1 to the circuit board 2; the top plate 3 is equipped with a fixing component, and the fixing component is used to contact the other side of the circuit board 2.

[0034] Specifically, this embodiment adds a circuit board, such as a printed circuit board, and a pad is provided at a corresponding power supply position on the circuit board 2, and a metal point 8 is fixed on the pad so that the metal point 8 protrudes from the circuit board 2. Figure 2 As shown, by contacting the metal point 8 with the pads 23 of the positive and negative electrodes of the light source 1, electrical connection can be achieved to power the light source 1. The bracket includes a top plate 3 and a bottom plate 4, and the structure is as follows Figure 1 and Figure 2 As shown, a space for installing the light source 1 and the circuit board 2 is formed between the top plate 3 and the bottom plate 4. The bottom plate 4 is provided with a light source groove 5 and an annular groove 7 for positioning the circuit board 2. After the light source 1 is fixed in the light source groove 5, the circuit board 2 is also assembled into the annular groove 7. The size of the annular groove 7 is adapted to the circuit board 2, which can reduce the displacement of the circuit board 2. The metal point 8 of the circuit board 2 contacts the positive and negative pads of the light source 1. At this time, by assembling the top plate 3 and the bottom plate 4 together, the fixing component of the top plate 3 is abutted against the circuit board 2, so that the contact between the circuit board 2 and the light source 1 is tightened, ensuring the normal contact between the metal point 8 and the light source 1.

[0035] The material of the metal point 8 can be tin. When the circuit board 2 is actually produced, tin is set on the pad of the output end of the circuit board 2 for power supply. At this time, the tin is square or irregular in shape. Then the circuit board 2 with tin is reflowed to melt the tin. At the same time, under the combination of the characteristics of the tin itself and the characteristics of the pad, the tin melts and becomes Figure 2 and Figure 4 The surface shown is a curved or spherical shape, that is, a convex point is formed. The shape of this convex point is convenient for contact with the pad of the light source 1 and is not prone to poor contact. On this basis, it is sufficient to make the metal point 8 and the pad in close contact.

[0036] Therefore, this embodiment further provides a fixing component, such as Figure 2 and Figure 4 As shown, the fixing assembly includes a plurality of spring buckles 9 , one end of each spring buckle 9 is fixed to the top plate 3 , a gap 10 is provided between the other end of each spring buckle 9 and the top plate 3 , and each spring buckle 9 abuts against the other side of the circuit board 2 .

[0037] Specifically, one end of the spring buckle 9 is integrally connected to the top plate 3. The structure of the bracket is generally formed by injection molding, and the material is plastic. The material of the bracket is the existing technology. Therefore, the spring buckle 9 is integrally formed on the top plate 3, and it only needs to adjust the jig during injection molding. The produced top plate 3 comes with the spring buckle 9, that is, it does not need to go through other production and assembly processes. When in use, the other end of the spring buckle 9 contacts the circuit board 2, giving the circuit board 2 a force toward the light source 1, that is, pushing the circuit board 2 toward the light source 1, and the light source 1 is fixed on the floor, so the role of the spring buckle 9 is to make the contact between the circuit board 2 and the light source 1 closer, and the material of the top plate 3 determines that the spring buckle 9 itself has a certain elasticity, so it can give a certain force to the circuit board 2 with the help of elastic force. Furthermore, in order to increase the elastic activity space of the spring buckle 9, the top plate 3 is provided with a corresponding avoidance groove 11, such as Figure 4 and Figure 5 As shown, when the spring buckle 9 is squeezed by the circuit board 2, it can move into the avoidance groove 11 according to the actual situation, so as to adapt to more thicknesses of the circuit board 2, and the spring buckle 9 is not easy to break, which does not affect the service life of the spring buckle 9. The more the number of spring buckles 9 in this embodiment, the tighter the contact between the circuit board 2 and the light source 1, and the ... Figure 2 As shown, three spring buckles 9 are provided, and the three spring buckles 9 form a triangular positioning, which can also provide a good thrust for stable installation and ensure normal contact between the circuit board 2 and the light source 1.

[0038] like Figure 1 The circuit board 2 of this embodiment is welded with two wiring terminals 14. The structure of the wiring terminals 14 is the prior art. The bottom plate 4 is provided with corresponding terminal grooves 15. After assembly, the wiring terminals 14 are located in the terminal grooves 15. The setting of the wiring terminals 14, in addition to connecting the external power supply, can also limit the circuit board 2 to prevent the circuit board 2 from rotating. Combined with the elastic force of the spring buckle 9, the circuit board 2 can be effectively fixed, so that the metal point 8 can stably contact with the soldering pad of the light source 1.

[0039] like Figure 3As shown, in order to ensure stable installation of the light source 1, the light source slot 5 of this embodiment is provided with four side walls 16, one of the side walls 16 is protrudingly provided with an arc-shaped limiting protrusion 17, and the bottom plate 4 is provided with a limiting adjustment hole 18, and the limiting adjustment hole 18 is close to the side wall 16 where the arc-shaped limiting protrusion 17 is provided, so that the arc-shaped limiting protrusion 17 can move; the other three side walls 16 are all protrudingly provided with fastening blocks 19, and the fastening blocks 19 and the arc-shaped limiting protrusions 17 are both used to abut against the light source 1.

[0040] Specifically, the general light source 1 is a COB light source 1. The square light source 1 adopted in this embodiment, the size of the light source slot 5 is adapted to the size of the light source 1. In order to ensure the stable installation of the light source 1, after the light source 1 is assembled to the light source slot 5, the three fastening blocks 19 respectively abut against the three sides of the light source 1, and the arc-shaped limit protrusion 17 abuts against the fourth side of the light source 1, and a limit adjustment hole 18 is opened at the position of the arc-shaped limit protrusion 17. Since the bottom plate 4 is made of a material with certain elasticity such as plastic, the limit adjustment hole 18 is set at a position close to the arc-shaped limit protrusion 17, so that the arc-shaped limit protrusion 17 can have a certain elastic activity space. When installing the light source 1, the arc-shaped limit protrusion 17 can fine-tune the position according to the size of the light source 1 to ensure that it can abut against the light source 1, thereby fixing the light source 1.

[0041] In addition, if Figure 3 In this embodiment, the edge of the bottom plate 4 is provided with a positioning rib 20, and the edge of the top plate 3 is provided with a positioning groove (not shown in the drawings) for assembling the positioning rib 20. During assembly, the positioning rib 20 and the positioning groove can be used to achieve the assembly positioning of the bottom plate 4 and the top plate 3. Furthermore, the bottom plate 4 is provided with a mounting column 21, and the top plate 3 is provided with a mounting groove 22. After assembly, the mounting column 21 is limited in the mounting groove 22, and the assembly can be fixed by screws and other existing technologies, which is not limited in this embodiment.

[0042] The prior art for the installation and power supply of COB light sources refers to the COB bracket disclosed in patent CN201620634420.X, which is to install the COB light source on the bracket, and then set a metal shrapnel, which is deformed by the metal shrapnel to contact the positive and negative electrodes of the COB light source to achieve the purpose of powering the COB light source. The metal shrapnel will deform when subjected to external force, and when the external force is removed, they will return to their original shape. This feature allows the shrapnel to closely contact the pad of the light source when compressed, so the prior art has many metal shrapnel applications in the COB light source bracket. However, this structure requires the installation of metal shrapnel, and a slot dedicated to the installation of metal shrapnel needs to be set on the bracket. The shrapnel needs to be installed and fixed to ensure stable power supply. The shrapnel structure is relatively small, and the production and installation process will lead to low efficiency, and the shrapnel is easy to lose, and the shrapnel is also prone to oxidation after a long time of use. Moreover, the production and assembly of the shrapnel requires manual participation, that is, it is difficult to achieve full-automatic production if the shrapnel structure is adopted.

[0043] In this embodiment, a circuit board is added, and there is no need to use a spring sheet or rely on the deformation of the spring sheet to achieve power supply. In this embodiment, power is achieved by contact between the metal point 8 and the positive and negative poles of the light source. That is, the contact method adopted in this embodiment is hard contact, and the metal point 8 will not deform. Therefore, in actual assembly, there is no need to control the degree of deformation, and there is no need to worry about poor contact caused by deformation changes over time. The metal point 8 can maintain contact with the positive and negative poles of the light source with the assistance of fixed components. In addition, the metal point 8 is a point, and the positive and negative electrode pads of the light source are surfaces. The contact between the point and the surface has a certain contact area. That is, even if the metal point 8 is displaced to a certain extent, it will not affect the contact between the metal point 8 and the pad, thereby ensuring the stability of the contact. The volume of the circuit board is larger than that of the spring sheet and it is easier to install. Because in actual production, the components on the circuit board can be automatically assembled by a placement machine, and the circuit board assembly method is simpler and can be assembled into electronic products through automated equipment. That is to say, this embodiment can achieve fully automatic production, which helps to improve production efficiency and production quality, and power supply can be achieved as long as the metal point 8 of the circuit board is in contact with the positive and negative poles of the light source, and then the circuit board is resisted and fixed by a fixing component set on the outer casing to ensure the stability of power supply. The application of circuit boards in COB light source lamps can effectively improve production efficiency, and can be used for a long time, and the power supply is more stable.

[0044] In this embodiment, a circuit board is added, and the welding-free and shrapnel-free structural assembly is realized by the stable installation of the light source 1, the stable installation of the circuit board 2, and the coordinated installation between the light source 1 and the circuit board 2. Specifically, the light source 1 and the circuit board 2 are respectively limited by the light source groove 5 and the annular groove 7. Figure 4In the direction of Figure 4 The force in the y direction, that is, toward the light source 1, makes the connection between the circuit board 2 and the light source 1 more stable, and combined with the installation of the terminal 14, limits the circuit board 2 in Figure 4 The rotation in the x direction can effectively fix the circuit board 2 and ensure the stability of the assembly between the circuit board 2 and the light source 1, realizing a soldering-free and shrapnel-free structural design, and the assembly process is simpler, saving the use of shrapnel and reducing production costs, which is more practical.

[0045] Embodiment 2:

[0046] like Figure 7 and Figure 8 As shown, the fixing assembly of this embodiment includes a plurality of springs 12, one end of the spring 12 abuts against the top plate 3, and the other end of the spring 12 abuts against the circuit board 2, and also applies a force in the y direction to the circuit board 2 to ensure stable contact between the circuit board 2 and the light source 1. The installation method of the spring 12 is, for example, to open a plurality of spring grooves on the top plate 3, embed the spring 12 into the spring grooves, and ensure that the spring 12 can leak out and abut against the circuit board 2; of course, the spring 12 can also be installed in a limited position by other methods, which are not limited in this embodiment.

[0047] Embodiment three:

[0048] In this embodiment, the circuit board can also be applied to other electronic products. The circuit board 2 includes a substrate and metal points 8 arranged on the substrate. The metal points 8 are used to contact with external structures to achieve electrical connection. The surface of the metal points 8 is a curved surface.

[0049] During production, a corresponding amount of tin is first placed at a corresponding position on the substrate, and then the circuit board with tin is subjected to reflow soldering. The tin melts during the reflow soldering process, and the melting process is based on the characteristics of the liquid, forming an arc-shaped outer surface on the soldering pad of the circuit board. Therefore, after the reflow soldering is completed, a convex point is formed on the soldering pad of the circuit board. The reflow soldering process can ensure the contact between the metal point 8 and the soldering pad of the circuit board to avoid cold soldering, false soldering, etc. The production has a high degree of automation and can improve production efficiency.

[0050] Furthermore, the shape of the axial cross section of the metal point 8 is similar to a hemisphere, and the surface of the metal point 8 is provided with a coating, namely an anti-oxidation coating (not shown in the drawings), which can prevent poor contact caused by oxidation of the surface of the metal point 8.

[0051] like Figure 4 and Figure 8As shown, the two metal points 8 are mainly used for power supply, so they are set as positive and negative poles. Preferably, the two metal points 8 are located on the same side of the circuit board. After the embodiment is installed in the electronic device, the fixing component 24 set on the electronic device can be used to contact the other side of the circuit board, so that the metal point 8 is stably in contact with the positive and negative poles of the structure to be powered 1 of the electronic device, thereby achieving the purpose of power supply. Of course, the metal point 8 can also be in contact with the external electronic device for the purpose of transmitting other electronic signals, which is not limited in this embodiment.

[0052] The contact method adopted in this embodiment is hard contact, and the metal point 8 will not deform. Therefore, during actual assembly, there is no need to control the degree of deformation, and there is no need to worry about poor contact caused by deformation changes over time. With the assistance of fixed components, the metal point 8 can maintain contact with the positive and negative poles of the light source. In addition, the metal point 8 is a point, and the positive and negative electrode pads of the light source are surfaces. The contact between the point and the surface has a certain contact area. That is, even if the metal point 8 is displaced to a certain extent, it will not affect the contact between the metal point 8 and the pad, thereby ensuring the stability of the contact.

[0053] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model is disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiments according to the technology of the utility model, which does not depart from the content of the technical solution of the utility model, belongs to the scope of the technical solution of the utility model.

Claims

1. A COB solder-free structure, characterized in that: It includes a bracket, a light source and a circuit board, the circuit board is installed on the bracket, the bracket includes a top plate and a bottom plate detachably connected to the top plate, the bottom plate is provided with a light source groove for assembling the light source, and the top plate is provided with a light hole for the light source to leak out; two metal points are provided on one side of the circuit board, and the two metal points are respectively used to contact the positive and negative poles of the light source to electrically connect the light source to the circuit board; the top plate is equipped with a fixing component, and the fixing component is used to contact the other side of the circuit board.

2. According to claim 1, a COB solder-free structure is characterized in that: The metal dots are tin dots.

3. According to claim 1, a COB solder-free structure is characterized in that: The metal point is a curved surface.

4. According to claim 1, a COB solder-free structure is characterized in that: The fixing assembly includes a plurality of spring buckles, one end of each spring buckle is fixed to the top plate, a gap is arranged between the other end of each spring buckle and the top plate, and each spring buckle contacts the other side of the circuit board.

5. A COB solder-free structure according to claim 4, characterized in that: One end of the spring buckle is integrally connected with the top plate.

6. A COB solder-free structure according to claim 4, characterized in that: The top plate is provided with a plurality of avoidance grooves, and the avoidance grooves are located below the spring buckles.

7. The COB solder-free structure according to claim 1, characterized in that: The fixing assembly includes a plurality of springs, one end of each spring abuts against the top plate, and the other end of each spring abuts against the other side of the circuit board.

8. A COB solder-free structure according to claim 7, characterized in that: The top plate is provided with a spring groove, and the spring is embedded in the spring groove.

9. The COB solder-free structure according to claim 1, characterized in that: The circuit board is equipped with connection terminals, the bottom plate is provided with terminal slots, and after the circuit board is assembled on the bracket, the connection terminals are assembled in the terminal slots.

10. The COB solder-free structure according to claim 1, characterized in that: The light source slot is provided with four side walls, one of which is protrudingly provided with an arc-shaped limit protrusion, and the bottom plate is provided with a limit adjustment hole, and the limit adjustment hole is close to the side wall where the arc-shaped limit protrusion is provided so that the arc-shaped limit protrusion can move; the other three side walls are all protrudingly provided with fastening blocks, and the fastening blocks and the arc-shaped limit protrusions are both used to resist the light source.

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