A fixing bracket for COB LED

Abstract

The present invention relates to the technical field of COB light source, and particularly relates to a fixing bracket for COB LED; the fixing bracket fixedly mounts the COB LED on a radiator; the COB LED includes a COB substrate and LED chips encapsulated on the COB substrate, a positive electrode and a negative electrode respectively connected to the positive power supply and the negative power supply are arranged on the top surface of the COB substrate, the bottom surface of the fixing bracket is in the same plane, and a wire groove for accommodating wires electrically connected to the positive electrode and the negative electrode of the COB substrate is concavely arranged upward on the bottom surface of the fixing bracket; an elastic clamping plate assembly is arranged on the fixing bracket; for the fixing bracket for COB LED in the present invention, the COB LED can be visually and fixedly mounted on the fixing bracket, and the COB LED will not fall off the fixing bracket during the movement of the fixing bracket to the radiator, and the COB substrate will not be misaligned after being mounted on the clamping groove.

Description

Technical Field

[0001] The present invention relates to the technical field of COB light sources, and particularly to a fixing bracket for a COB LED. Background Art

[0002] COB, i.e., chip On board, means adhering a bare chip to an interconnection substrate with conductive or non-conductive adhesive, and then performing wire bonding to achieve its electrical connection. COB LED is also called COB LED source or COB LED module. For the COB LED surface light source, first, a heat-conducting epoxy resin (generally an epoxy resin doped with silver particles) is used to cover the silicon wafer placement point on the substrate surface, then the silicon wafer is directly placed on the substrate surface, and heat-treated until the silicon wafer is firmly fixed on the substrate. Subsequently, an electrical connection is directly established between the silicon wafer and the substrate by wire bonding.

[0003] As Figure 1 shown, in the prior art, the COB LED1 is fixed on a radiator through a fixing bracket 2. The COB LED1 includes a square COB substrate 3 and a circular LED chip 4 encapsulated on the COB substrate 3. On the front surface of the COB substrate 3, a positive electrode and a negative electrode respectively connected to the positive and negative poles of the power supply are provided. The lower end surface of the fixing bracket 2 is recessed upward to form a square card slot 5 for accommodating the COB substrate 3 and a wire slot 6 for accommodating wires communicating with the card slot 5. There is a window 7 in the middle of the fixing bracket 2 for the LED chip 4 to be exposed. The thickness of the COB substrate 3 is the same as the depth of the card slot 5. During installation, the positive and negative electrodes on the COB substrate 3 are first connected to the wires, then the COB LED1 is placed on the radiator, and then the fixing bracket 2 with the front side facing up is covered on the COB LED1. Finally, the fixing bracket 2 is fixed on the radiator by screws. The bottom surface of the COB LED1 (i.e., the bottom surface of the COB substrate 3) needs to be completely attached to the radiator to dissipate heat from the COB LED1 well to ensure the lifespan of the COB LED1. Since when the fixing bracket 2 with the front side facing up is covered on the COB LED1, only the LED chip 4 can be seen through the window 7, and the edge of the COB substrate 3 cannot be seen (the body of the fixing bracket 2 blocks the edge of the COB substrate 3). It is very difficult to tightly and precisely fit the square COB substrate 3 with a thickness of only 0.8 mm - 1.2 mm into the square card slot 5. There is no way to align it at all, and it is basically blind installation. At the same time, the wires need to be placed in the wire slot 6, making the installation even more difficult. Due to the relatively thin COB substrate 3, the installation difficulty is very high and the installation efficiency is also low.

[0004] In the prior art, there are also methods of fixing the COB LED on the fixing bracket by setting protrusions on the side walls of the card slots of the fixing bracket, or by setting cards or elastic pieces on the sides of the card slots, and fixing the COB LED on the fixing bracket by press-fitting the COB substrate or clamping the side walls of the COB substrate. Although the fixing bracket is flipped to the bottom side up for installing the COB LED, the problem of blind installation is solved. However, on the one hand, the thickness of the COB substrate is generally 0.8 mm, 1.0 mm, or 1.2 mm, which is relatively small. Therefore, the contact area between the protrusions, cards, elastic pieces and the COB substrate is small, and the press-fitting force or clamping force is small. On the other hand, the fixing bracket is generally made of PC material, which is a hard plastic, and the COB substrate is generally a ceramic substrate or an aluminum substrate. Therefore, it is difficult for both the protrusions and the COB substrate to deform, and the press-fitting effect is not good. When the COB LED is press-fitted on the fixing bracket through the protrusions, cards, and elastic pieces, after the front side of the fixing bracket is flipped up, under its own gravity, the COB LED will fall off during the movement of the fixing bracket to the radiator.

[0005] In the prior art, there is also a method of fixing the wires connected to the positive electrode and negative electrode on the COB substrate in the wire installation slots in the fixing bracket, and installing the COB substrate in the card slot through the pulling force of the wires on the COB substrate. This installation method flips the fixing bracket to the bottom side up to install the COB LED, which also solves the problem of blind installation. However, after the front side of the fixing bracket is flipped up, due to the relatively shallow card slot and the relatively small thickness of the COB substrate, under its own gravity, during the movement of the fixing bracket to the radiator, the COB substrate will be misaligned with the card slot.

[0006] A fixing bracket for a COB LED is proposed to solve the problems existing in the prior art. Summary of the Invention

[0007] The object of the present invention is to provide a fixing bracket for a COB LED to solve the problems that when the fixing bracket is sleeved on the COB LED in the prior art, it is simply impossible to align, and it is basically blind installation; when the COB LED is press-fitted on the fixing bracket through protrusions, cards, elastic pieces, and wire pulling force, the COB LED is likely to fall off or be misaligned.

[0008] The technical solution of the present invention is: a fixing bracket for a COB LED, the fixing bracket fixedly installs the COB LED on the radiator; the COB LED includes a COB substrate and LED chips encapsulated on the COB substrate. Positive and negative electrodes respectively connected to the power supply positive electrode and power supply negative electrode are provided on the top surface of the COB substrate. The bottom surface of the fixing bracket is in the same plane, and a wire groove for accommodating wires electrically connected to the positive and negative electrodes of the COB substrate is concavely provided upward on the bottom surface of the fixing bracket.

[0009] The fixing bracket is provided with an elastic card assembly, the COB LED is fixed on the fixing bracket through the elastic card assembly and the LED chip is exposed on the top surface of the fixing bracket, and at this time, the bottom surface of the COB substrate is lower than the bottom surface of the fixing bracket;

[0010] When the fixing bracket with the COB LED clamped is fixed on the heat sink, the elastic clamping plate assembly generates elastic deformation under the action of the top resistance force applied by the heat sink to release the COB LED and make the bottom surface of the COB substrate fit with the heat sink.

[0011] Preferably, a card slot matching the shape of the COB LED is formed through the fixing bracket, and after the COB LED is placed in the card slot, the COB substrate is limited by the elastic card assembly to fix the COB LED on the fixing bracket;

[0012] When the COB LED is fixed on the fixing bracket, the thickness of the COB substrate protruding from the bottom surface of the fixing bracket is 1 / 10 of the thickness of the COB substrate.

[0013] Preferably, the elastic card assembly includes a limiting part for limiting the edge of the COB substrate, and a driving part connected to the limiting part to drive the limiting part to cancel the limitation of the COB substrate; the driving force of the driving part comes from the top resistance force applied by the radiator when the fixed bracket after the COB LED is clamped is fixed on the radiator.

[0014] Preferably, the number of the elastic card plate assemblies is two, which are arranged on two opposite sides of the card slot; each of the limiting parts is a limiting plate, and the top of the edge of the limiting plate that is biased towards the card slot is provided with a rectangular notch to form a stepped card protrusion at the lower end of the corresponding edge, and the rectangular notch forms the bottom surface and the side surface of the slot; the corresponding two limiting parts are respectively recorded as the first bottom surface and the first side surface of the slot, the second bottom surface and the second side surface of the slot;

[0015] Each of the driving parts is a warping plate extending outward and downward at the same time, and the lowest point of the warping plate in a natural state is lower than the bottom surface of the fixed bracket;

[0016] The fixing bracket is provided with an accommodating space that allows the limiting part and the driving part to deform; when the fixing bracket after the COB LED is clamped is fixed on the heat sink, the limiting part and the driving part produce elastic deformation under the top force of the heat sink, and at this time, the lowest points of the limiting part and the driving part are on the same horizontal plane with the bottom surface of the COB substrate.

[0017] Preferably, the card slot includes a square-sectioned card slot that fits the COB substrate, a through slot that fits the LED chip and allows the LED chip to pass through, and a tapered slot with a base diameter equal to the diameter of the through slot and an increasing diameter. The depth of the card slot is less than the thickness of the COB substrate;

[0018] The length of the card protrusion is 0.25 mm.

[0019] Preferably, the vertical distance between the bottom surface of the first slot and the bottom surface of the card slot matches the thickness of the COB substrate, and the vertical distance between the bottom surface of the second slot and the bottom surface of the card slot matches the thickness of the COB substrate; the vertical distance between the side surface of the first slot and the side surface of the second slot matches the side length of the COB substrate; the side surface of the first slot and one inner wall of the card slot are in the same vertical plane, and the side surface of the second slot and the other inner wall of the card slot are in the same vertical plane.

[0020] Preferably, the warping plate is formed by the fixed bracket body forming the through slot extending outward and downward at the same time. The fixed bracket is provided with a first accommodation space allowing the warping plate to deform; the limiting plate extends horizontally inward with the warping plate as the base point, and the warping plate is provided with a second accommodation space allowing the limiting plate to deform;

[0021] In the natural state of the limiting plate, its bottom surface is lower than the bottom surface of the fixed bracket.

[0022] Preferably, the number of wire grooves is two, symmetrically arranged on the bottom surface of the fixed bracket; the card slot and the through slot are jointly connected to the two wire grooves.

[0023] Preferably, a pair of countersunk screw holes are symmetrically penetrated through the fixed bracket, and each countersunk screw hole includes a first through hole and a second through hole with decreasing diameters from top to bottom.

[0024] Preferably, a pair of arc-shaped rotating grooves are symmetrically penetrated through the fixed bracket, and the side edges of the upper end of the inner wall of the rotating groove extend outward to form arc-shaped clamping plates.

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] (1)A fixing bracket for COB LED in the present invention is provided with an elastic clamping plate assembly on the fixing bracket. The COB LED is fixed on the fixing bracket through the elastic clamping plate assembly, and the LED chip is exposed on the top surface of the fixing bracket. At this time, the bottom surface of the COB substrate is lower than the bottom surface of the fixing bracket. When the fixing bracket with the COB LED installed is fixed on the radiator, the elastic clamping plate assembly generates elastic deformation under the action of the top pressure applied by the radiator to release the COB LED, and makes the bottom surface of the COB substrate fit with the radiator. The elastic clamping plate assembly includes a limiting plate for limiting the edge of the COB substrate, and a warping plate connected to the limiting plate to drive the limiting plate to cancel the limitation of the COB substrate and extend outward and downward at the same time. A fixing bracket for COB LED in the present invention can visually and fixedly install the COB LED on the fixing bracket, and the COB LED will not fall off the fixing bracket during the movement of the fixing bracket to the radiator. After the COB substrate is installed in the card slot, it will not be misaligned. When the fixing bracket with the COB LED installed is fixed on the radiator, the fixing bracket can release the COB LED to ensure that the COB substrate of the COB LED fits with the radiator, overcoming the problems of blind installation, falling off and misalignment in the prior art, and improving the installation efficiency.

[0027] (2)The COB LED in the present invention is fixed on the fixing bracket through the elastic clamping plate assembly, and the LED chip is exposed on the top surface of the fixing bracket. At this time, the bottom surface of the COB substrate is lower than the bottom surface of the fixing bracket. In the present invention, when the COB LED is fixed on the fixing bracket, the bottom surface of the COB substrate is lower than the bottom surface of the fixing bracket, which can ensure that when the fixing bracket with the COB LED installed is fixed on the radiator, the bottom surface of the COB substrate completely fits with the radiator. In the prior art, when the COB LED is fixed on the fixing bracket, the bottom surface of the COB substrate is flush with the bottom surface of the fixing bracket. In actual installation, due to the tolerance of the thickness of the COB substrate and the installation error, if they are flush, it may occur that the bottom surface of the COB substrate cannot completely fit with the radiator, affecting the heat dissipation of the COB LED and further affecting the life of the COB LED. In the present invention, the bottom surface of the COB substrate can completely fit with the radiator, ensuring the life of the COB LED.

[0028] (3)In the present invention, a fixing bracket for a COB LED has a clamping projection with a length of 0.25 mm. In the present invention, the fixing of the COB LED on the fixing bracket is achieved through the cooperation of a pair of limiting plates and a clamping groove. When the COB LED is fixed on the fixing bracket, the bottom surface of the fixing bracket needs to face upward. After clamping, the front surface of the fixing bracket faces upward. The 0.25-mm length setting of the clamping projection can ensure that the COB substrate of the COB LED overcomes the obstruction of the clamping projection and is clamped in the clamping groove, and can also ensure that after the front surface of the fixing bracket is turned upward, the edge of the COB substrate of the COB LED is clamped and limited by the clamping projection, and is firmly clamped on the fixing bracket. During the movement of the fixing bracket to the radiator, the COB LED will not fall off or shift. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the drawings and embodiments:

[0030] Figure 1 is a schematic front assembly structure diagram of a COB LED mounted on a fixing bracket in the prior art;

[0031] Figure 2 is a schematic rear assembly structure diagram of a COB LED mounted on a fixing bracket in the prior art;

[0032] Figure 3 is a schematic front assembly structure diagram of a fixing bracket for a COB LED according to this embodiment, with the COB LED mounted on the fixing bracket;

[0033] Figure 4 is a schematic rear assembly structure diagram of a fixing bracket for a COB LED according to this embodiment, with the COB LED mounted on the fixing bracket;

[0034] Figure 5 is a schematic three-dimensional structure diagram of the fixing bracket according to this embodiment from the bottom view angle;

[0035] Figure 6 is a schematic three-dimensional structure diagram of the fixing bracket according to this embodiment from the bottom view angle;

[0036] Figure 7 is a top view and a right view of the fixing bracket according to this embodiment;

[0037] Figure 8 is a bottom view of the fixing bracket according to this embodiment;

[0038] Figure 9 is a sectional view of the fixing bracket according to this embodiment;

[0039] Figure 10 is a schematic structure diagram of the fixing bracket after clamping the COB LED and being installed on the radiator with screws according to this embodiment.

[0040] Among them: 1. COB LED, 2. Fixed bracket, 3. COB substrate, 4. LED chip, 5. Card slot, 6. Wire slot, 7. Window, 8. Radiator, 9. Bottom surface of the first slot, 10. Side surface of the first slot, 11. Bottom surface of the second slot, 12. Side surface of the second slot, 13. Through slot, 14. Tapered slot, 15. First accommodation space, 16. Second accommodation space, 17. First elastic card plate assembly, 18. First warping plate, 19. First limiting plate, 20. First convex, 21. Second elastic card plate assembly, 22. Second warping plate, 23. Second limiting plate, 24. Second convex, 25. First countersunk screw hole, 26. Second countersunk screw hole, 27. Rotating slot. Specific embodiments

[0041] The following will further elaborate on the content of the present invention in combination with specific embodiments:

[0042] In the description of the invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the invention.

[0043] As Figures 3 - 8 shown, a fixed bracket 2 for a COB LED 1 fixes the COB LED 1 on a radiator 8; the COB LED 1 includes a COB substrate 3 and an LED chip 4 (the circular part in Figure 3 ) encapsulated on the COB substrate 3. On the top surface of the COB substrate 3, there are a positive electrode and a negative electrode respectively connected to the power supply positive electrode and the power supply negative electrode. The bottom surface of the fixed bracket 2 is in the same plane, and the bottom surface of the fixed bracket 2 is concavely arranged upward to form a wire slot 6 for accommodating wires electrically connected to the positive electrode and the negative electrode of the COB substrate 3; an elastic card plate assembly is provided on the fixed bracket 2, and the COB LED 1 is fixed on the fixed bracket 2 through the elastic card plate assembly and the LED chip 4 is exposed on the top surface of the fixed bracket 2. At this time, the bottom surface L of the COB substrate 3 is lower than the bottom surface M of the fixed bracket 2 (as Figure 10As shown in the figure, specifically, when the COB LED1 is fixed on the fixing bracket 2, the thickness of the COB substrate 3 protruding from the bottom surface of the fixing bracket 2 is 1 / 10 of the thickness of the COB substrate 3; in this embodiment, when the COB LED1 is fixed on the fixing bracket 2, the bottom surface of the COB substrate 3 is lower than the bottom surface of the fixing bracket 2, which can ensure that when the fixing bracket 2 with the COB LED1 installed is fixed on the radiator 8, the bottom surface of the COB substrate 3 is completely attached to the radiator 8. In the prior art, when the COB LED1 is fixed on the fixing bracket 2, the bottom surface of the COB substrate 3 is flush with the bottom surface of the fixing bracket 2. In actual installation, due to the tolerance of the thickness of the COB substrate 3 and the installation error, if they are flush, it may occur that the bottom surface of the COB substrate 3 cannot be completely attached to the radiator 8, affecting the heat dissipation of the COB LED1 and thus affecting the lifespan of the COB LED1; when the fixing bracket 2 with the COB LED1 installed is fixed on the radiator 8 (in this embodiment, the fixing bracket 2 is fixed on the radiator 8, which means that the bottom surface of the COB substrate 3 is attached to the radiator 8, and the state when the screw for fixing the fixing bracket 2 is tightened to the end is the state where the fixing bracket 2 is fixed on the radiator 8), the elastic clamping plate assembly generates elastic deformation under the action of the abutting force applied by the radiator 8 to release the COB LED1, and makes the bottom surface of the COB substrate 3 attached to the radiator 8.

[0044] The difficulty of the present invention lies in how to achieve a visible and fixed installation of the COB LED1 on the fixing bracket 2, and the COB LED1 will not fall off the fixing bracket 2 during the movement of the fixing bracket 2 to the radiator 8, and the COB substrate 3 will not be misaligned after being installed on the card slot 5, so as to improve the installation efficiency; then the fixing bracket 2 with the COB LED1 installed is fixed on the radiator 8, and the fixing bracket 2 can release the COB LED1 to ensure that the COB substrate 3 of the COB LED1 is attached to the radiator 8; that is, how to set a structure on the fixing bracket 2, which can not only ensure the visible clamping of the COB LED1, but also release the clamped COB LED1 when the fixing bracket 2 with the COB LED1 installed is fixed on the radiator 8, and make the bottom surface of the COB substrate 3 completely attached to the radiator 8; overcoming the problems of blind installation, falling off and misalignment in the prior art, and improving the installation efficiency; the generation of the specific structure concept of this fixing bracket 2 is the difficulty of the present invention.

[0045] The fixing bracket 2 is provided with a clamping groove penetrating therethrough and conforming to the shape of the COB LED 1. After the COB LED 1 is placed in the clamping groove, the COB substrate 3 is limited by the elastic clamping plate assembly so that the COB LED 1 is fixed on the fixing bracket 2. The elastic clamping plate assembly includes a limiting portion for limiting the edge of the COB substrate 3 and a driving portion connected to the limiting portion to drive the limiting portion to cancel the limitation of the COB substrate 3; the driving force of the driving portion comes from the abutting force applied by the radiator 8 when the fixing bracket 2 after clamping the COB LED 1 is fixed on the radiator 8. The number of the elastic clamping plate assemblies is two, which are respectively arranged on two opposite sides of the clamping groove; each limiting portion is a limiting plate, and a rectangular parallelepiped-shaped notch is provided at the top of the edge of the limiting plate facing the clamping groove side to form a clamping convex at the lower step of the corresponding edge. The rectangular parallelepiped-shaped notch forms a groove bottom surface and a groove side surface; the corresponding two limiting portions are respectively denoted as a first groove bottom surface 9 and a first groove side surface 10, a second groove bottom surface 11 and a second groove side surface 12; each driving portion is a warping plate extending outward and downward at the same time. In the natural state, the lowest point of the warping plate is lower than the bottom surface of the fixing bracket 2; the fixing bracket 2 is provided with an accommodating space allowing the limiting portion and the driving portion to deform. When the fixing bracket 2 after clamping the COB LED 1 is fixed on the radiator 8, the limiting portion and the driving portion generate elastic deformation under the abutting force of the radiator 8. At this time, the lowest points of the limiting portion and the driving portion are on the same horizontal plane as the bottom surface of the COB substrate 3. The length H of the clamping convex is 0.25 mm (as Figure 7 shown). In this embodiment, the fixing of the COB LED 1 on the fixing bracket 2 is realized through the cooperation of a pair of limiting plates and the clamping groove. When the COB LED 1 is fixed on the fixing bracket 2, the bottom surface of the fixing bracket 2 needs to face upward. After clamping, the front surface of the fixing bracket 2 faces upward. The setting of the 0.25 mm length of the clamping convex can ensure that the COB substrate 3 overcomes the blockage of the clamping convex and is clamped in the following clamping groove 5, and can also ensure that after the front surface of the fixing bracket 2 is turned upward, the edge of the COB substrate 3 of the COB LED 1 is clamped and limited by the clamping convex and firmly clamped on the fixing bracket 2. During the movement of the fixing bracket 2 to the radiator 8, the COB LED 1 will not fall off or shift.

[0046] As Figure 9As shown, the card slot includes a square-section card slot 5 that is sequentially connected and fits with the COB substrate 3, a through slot 13 that fits with the LED chip 4 and allows the LED chip 4 to pass through, and a tapered slot 14 with the diameter of the through slot 13 as the base diameter and the diameter gradually increasing. The design of the tapered slot 14 facilitates the light emission of the LED chip 4 and will not block the light emission of the LED chip 4. If there is a fixed bracket 2 body here, it will block the light emission of the LED chip 4; the slot depth of the card slot 5 is less than the thickness of the COB substrate 3 to correspond to the previously described "an elastic card plate assembly is provided on the fixed bracket 2, and the COB LED1 is fixed on the fixed bracket 2 through the elastic card plate assembly and the LED chip 4 is exposed on the top surface of the fixed bracket 2. At this time, the bottom surface of the COB substrate 3 is lower than the bottom surface of the fixed bracket 2", that is, the COB substrate 3 protrudes from the bottom surface of the fixed bracket 2.

[0047] The vertical distance between the bottom surface 9 of the first slot and the bottom surface of the card slot 5 matches the thickness of the COB substrate 3; the vertical distance between the bottom surface 11 of the second slot and the bottom surface of the card slot 5 matches the thickness of the COB substrate 3; the vertical distance between the side surface 10 of the first slot and the side surface 12 of the second slot matches the side length of the COB substrate 3; the side surface 10 of the first slot and one inner wall of the card slot 5 are in the same vertical plane, and the side surface 12 of the second slot and the other inner wall of the card slot 5 are in the same vertical plane. Through the above settings, the COB substrate 3 is installed in the card slot 5 and is limited by the card protrusion and will not fall out of the card slot 5.

[0048] The warping plate is formed by the fixed bracket 2 body that forms the through slot 13 and extends outward and downward at the same time. The fixed bracket 2 is provided with a first accommodation space 15 that allows the warping plate to deform; the limiting plate extends horizontally inward with the warping plate as the base point. The warping plate is provided with a second accommodation space 16 that allows the limiting plate to deform; in the natural state, the bottom surface of the limiting plate is lower than the bottom surface of the fixed bracket 2. In this embodiment, during the process of fixing the fixed bracket 2 with the COB LED1 installed on the radiator 8 by screws, the warping plate deforms by the top pressure of the radiator 8 and drives the limiting plate to move, so that a pair of limiting plates gradually loosen the COB substrate 3 of the COB LED1. When the two screws for fixing the fixed bracket 2 are all tightened, the COB substrate 3 of the COB LED1 is completely attached to the radiator 8.

[0049] When fixing the fixed bracket 2 with the COB LED1 installed on the radiator 8, the fixed bracket 2 is fixed on the radiator 8 with two screws. Since in the natural state, the lowest point of the warping plate is lower than the bottom surface of the fixed bracket 2, so during the process of screwing the screws, the warping plate gives a pressure to the radiator 8, and correspondingly, the radiator 8 gives a top pressure to the warping plate; in this embodiment, as Figure 7As shown in (a) thereof, the fixing bracket 2 is disc-shaped, and two countersunk screw holes are on the diameter A of the fixing bracket 2, respectively denoted as the first countersunk screw hole 25 on the left and the second countersunk screw hole 26 on the right; there are two elastic clamping plate assemblies, respectively denoted as the first elastic clamping plate assembly 17 and the second elastic clamping plate assembly 21. The warping plate and the limiting plate on the first elastic clamping plate assembly 17 are denoted as the first warping plate 18 and the first limiting plate 19, and the clamping protrusion on the first limiting plate 19 is denoted as the first clamping protrusion 20; the warping plate and the limiting plate on the second elastic clamping plate assembly 21 are denoted as the second warping plate 22 and the second limiting plate 23, and the clamping protrusion on the second limiting plate 23 is denoted as the second clamping protrusion 24; wherein the first elastic clamping plate assembly 17 and the second elastic clamping plate assembly 21 are symmetrically arranged on the fixing bracket 2, and the first elastic clamping plate assembly 17 and the second elastic clamping plate assembly 21 are respectively arranged on both sides of the diameter B perpendicular to the diameter A. Among them, the first elastic clamping plate assembly 17 is close to the first countersunk screw hole 25, and the second elastic clamping plate assembly 21 is close to the second countersunk screw hole 26.

[0050] The number of wire grooves 6 is two, symmetrically arranged on the bottom surface of the fixing bracket 2; the clamping grooves 5 and the through grooves 13 are jointly communicated with the two wire grooves 6. A pair of countersunk screw holes are symmetrically and penetratingly opened on the fixing bracket 2, and each countersunk screw hole includes a first through hole and a second through hole with a decreasing diameter from top to bottom. A pair of arc-shaped rotating grooves 27 are symmetrically and penetratingly arranged on the fixing bracket 2, and the side edges of the upper end part of the inner wall of the rotating groove 27 extend outwards to form arc-shaped clamping plates. In this embodiment, the rotating groove 27 is used to clamp the reflector cup, realizing the detachable installation of the reflector cup, and the installation is more convenient.

[0051] The using method of a fixing bracket 2 for a COB LED1 in the present invention is as follows: in the initial state, the positive electrode and the negative electrode of the COB substrate 3 have been respectively connected to the positive electrode and the negative electrode of the power supply through wires (as Figure 3 shown, the positive electrode and the negative electrode of the COB substrate 3 are at the diagonal edges of the substrate. In this embodiment, the wires are not shown), the bottom surface of the fixing bracket 2 faces upwards, the LED chip 4 part in the COB LED1 is passed through the through groove 13 of the clamping groove, the pair of corners connecting the wires correspond to the wire grooves 6, and the COB substrate 3 of the COB LED1 is clamped into the clamping groove 5 by overcoming the blocking of the first clamping protrusion 20 and the second clamping protrusion 24 (as Figure 4 shown), thereby fixing the COB LED1 on the fixing bracket 2. Then, the fixing bracket 2 is turned over with the front side facing upwards (the LED chip 4 part of the COB LED1 is exposed); next, taking Figure 7 the direction as a reference, as Figure 7In the direction of (a), fix the fixing bracket 2 on the radiator 8. Specifically, first place the fixing bracket 2 after mounting the COB LED 1 on the radiator 8, hold the fixing bracket 2 by hand, put the first screw into the second countersunk screw hole 26 on the right, and pre-twist the first screw (do not tighten the first screw too tightly, stop when it is slightly immovable). At this time, as the first screw is screwed in, the fixing bracket 2 tilts, and the end where the second countersunk screw hole 26 is located gradually approaches the radiator; then as Figure 7 In the direction of (b), during the process, the first warping plate 18 and the second warping plate 22 swing slightly towards the first accommodation space 15 with their roots as the base points. The second warping plate 22 then drives the second limiting plate 23 to move slightly upward and to the left as a whole from the vertical state. The first warping plate 18 then drives the first limiting plate 19 to move slightly downward and to the left from the vertical state. When the pre-twisting of the first screw ends and the fixing bracket 2 tilts to the maximum, during the pre-twisting of the first screw, the first elastic clamping plate assembly 17 and the second elastic clamping plate assembly 21 undergo slight elastic deformation, and the COB substrate 3 of the COB LED 1 remains clamped in the clamping groove; as Figure 7 In the direction of (a), put the second screw into the first countersunk screw hole 25 on the left; then as Figure 7 In the direction of (b), as the second screw is screwed in, during the process, the first warping plate 18 and the second warping plate 22 swing towards the first accommodation space 15 with their roots as the base points. The second warping plate 22 then drives the second limiting plate 23 to move upward and to the left from the vertical state. The first warping plate 18 then drives the first limiting plate 19 to move downward and to the left from the vertical state. As the second screw is gradually screwed in, the COB substrate 3 of the COB LED 1 gradually fits the radiator 8, and the first convex 20 and the second convex 24 gradually disengage from the COB substrate 3. When the second screw is fully screwed in, the COB substrate 3 of the COB LED 1 basically fits the radiator 8; finally, screw the first screw to the end, and the COB substrate 3 of the COB LED 1 completely fits the radiator 8; at the same time, the first warping plate 18, the second warping plate 22, the first convex 20, and the second convex 24 are in contact with the radiator 8 (finally as Figure 10 shown).

[0052] The above embodiments are only used to illustrate the technical concept and features of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes that fall within the meaning and scope of the equivalent elements of the claims within the present invention.

Claims

1. A fixing bracket for COB LED, wherein the fixing bracket fixes the COB LED on a heat sink; the COB LED comprises a COB substrate, an LED chip packaged on the COB substrate, and a positive electrode and a negative electrode connected to a positive electrode and a negative electrode of a power source are respectively arranged on the top surface of the COB substrate, characterized in that: The bottom surface of the fixing bracket is in the same plane, and the bottom surface of the fixing bracket is upwardly concave and provided with a wire groove for accommodating wires electrically connected to the positive and negative electrodes of the COB substrate; The fixing bracket is provided with an elastic card assembly, the COB LED is fixed on the fixing bracket through the elastic card assembly and the LED chip is exposed on the top surface of the fixing bracket, and at this time, the bottom surface of the COB substrate is lower than the bottom surface of the fixing bracket; When the fixing bracket with the COB LED mounted thereon is fixed on the heat sink, the elastic clamping plate assembly generates elastic deformation under the top force applied by the heat sink to release the COB LED, and the bottom surface of the COB substrate is fitted with the heat sink; The fixing bracket is provided with a card slot that matches the shape of the COB LED. After the COB LED is placed in the card slot, the COB substrate is limited by the elastic card assembly to fix the COB LED on the fixing bracket. When the COB LED is fixed on the fixing bracket, the thickness of the COB substrate protruding from the bottom surface of the fixing bracket is 1 / 10 of the thickness of the COB substrate; The elastic card assembly includes a limiting part for limiting the edge of the COB substrate, and a driving part connected to the limiting part to drive the limiting part to cancel the limitation of the COB substrate; the driving force of the driving part comes from the top resistance force applied by the radiator when the fixed bracket after the COB LED is clamped is fixed on the radiator.

2. A fixing bracket for COB LED according to claim 1, characterized in that: The number of the elastic card plate components is two, which are arranged on two opposite sides of the card slot; each of the limiting parts is a limiting plate, and the top of the edge of the limiting plate that is biased towards the card slot is provided with a rectangular notch to form a stepped card protrusion at the lower end of the corresponding edge, and the rectangular notch forms the bottom surface and the side surface of the slot; the corresponding two limiting parts are respectively recorded as the first bottom surface and the first side surface of the slot, the second bottom surface and the second side surface of the slot; Each of the driving parts is a warping plate extending outward and downward at the same time, and the lowest point of the warping plate in a natural state is lower than the bottom surface of the fixed bracket; The fixing bracket is provided with an accommodating space that allows the limiting part and the driving part to deform; when the fixing bracket after the COB LED is clamped is fixed on the heat sink, the limiting part and the driving part produce elastic deformation under the top force of the heat sink, and at this time, the lowest points of the limiting part and the driving part are on the same horizontal plane with the bottom surface of the COB substrate.

3. The fixing bracket for COB LED according to claim 2, characterized in that: The card slot includes a card slot with a square cross section that matches the COB substrate, a through slot that matches the LED chip and accommodates the LED chip, and a tapered slot with a diameter that is based on the diameter of the through slot and gradually increases in diameter, and the depth of the card slot is less than the thickness of the COB substrate; The length of the protrusion is 0.25 mm.

4. The fixing bracket for COB LED according to claim 3, characterized in that: The vertical spacing between the bottom surface of the first groove and the bottom surface of the card slot matches the thickness of the COB substrate, and the vertical spacing between the bottom surface of the second groove and the bottom surface of the card slot matches the thickness of the COB substrate; the vertical spacing between the side surface of the first groove and the side surface of the second groove matches the side length of the COB substrate; the side surface of the first groove and the inner wall on one side of the card slot are in the same vertical plane, and the side surface of the second groove and the inner wall on the other side of the card slot are in the same vertical plane.

5. The fixing bracket for COB LED according to claim 4, characterized in that: The warping plate is formed by a fixing bracket body forming a through groove and extending outward and downward at the same time, and the fixing bracket is penetrated to open a first accommodation space allowing the warping plate to deform; the limiting plate is formed by horizontally extending inward with the warping plate as a base point, and the warping plate is penetrated to open a second accommodation space allowing the limiting plate to deform; In a natural state, the bottom surface of the limiting plate is lower than the bottom surface of the fixing bracket.

6. The fixing bracket for COB LED according to claim 3, characterized in that: The number of the wire troughs is two, which are symmetrically arranged on the bottom surface of the fixed bracket; the clamping slot and the through slot are connected to the two wire troughs.

7. The fixing bracket for COB LED according to claim 1, characterized in that: A pair of countersunk screw holes are symmetrically formed on the fixing bracket, and each countersunk screw hole includes a first through hole and a second through hole whose diameters decrease from top to bottom.

8. The fixing bracket for COB LED according to claim 1, characterized in that: A pair of arc-shaped rotating grooves are symmetrically arranged on the fixing bracket, and an arc-shaped clamping plate is extended outward from the side edges of the upper ends of the inner walls of the rotating grooves.

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