Fixing support for COB LED

Abstract

The invention relates to the technical field of COB light sources, in particular to a fixing support for a COB LED. The COB LED is fixedly installed on the radiator through the fixing support. The COB LED comprises a COB substrate and an LED chip packaged on the COB substrate, the top surface of the COB substrate is provided with a positive electrode and a negative electrode which are respectively connected with the positive electrode and the negative electrode of the power supply, the bottom surface of the fixed bracket is in the same plane, and the bottom surface of the fixed bracket is upwards and inwards concavely provided with a wire groove for accommodating a wire electrically connected with the positive electrode and the negative electrode of the COB substrate; an elastic clamping plate assembly is arranged on the fixed bracket; according to the fixing support for the COB LED, the COB LED is fixedly installed on the fixing support in a visible mode, the COB LED cannot fall off from the fixing support when the fixing support moves to a radiator, and the COB substrate cannot be dislocated after being installed on the clamping groove.

Description

Technical Field

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

[0002] COB stands for chip on board, which means that the bare chip is adhered to the interconnect substrate with conductive or non-conductive glue, and then wire bonding is performed to achieve its electrical connection. COB LED is also called COB LED source, COB LED module; COB LED surface light source first covers the silicon wafer placement point on the substrate surface with thermal conductive epoxy resin (usually epoxy resin doped with silver particles), and then directly places the silicon wafer on the substrate surface, heat treats it until the silicon wafer is firmly fixed on the substrate, and then uses wire bonding to directly establish an electrical connection between the silicon wafer and the substrate.

[0003] like Figure 1 As shown, in the prior art, the COB LED 1 is fixed on the heat sink through a fixing bracket 2, and the COB LED 1 includes a square COB substrate 3, a circular LED chip 4 packaged on the COB substrate 3, and a positive electrode and a negative electrode connected to the positive electrode and the negative electrode of the power supply are respectively arranged on the front of the COB substrate 3; the lower end surface of the fixing bracket 2 is upwardly concavely provided with a square card slot 5 for accommodating the COB substrate 3, and a wire slot 6 for accommodating wires connected to the card slot 5, and a window 7 for exposing the LED chip 4 is arranged in the middle of the fixing bracket 2, and 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 with wires, and then the COB LED 1 is placed on the heat sink, and then the cover of the fixing bracket 2 facing upward is put on the COB LED 1, and finally the fixing bracket 2 is fixed to the heat sink by screws; the bottom surface of the COB LED 1 (that is, the bottom surface of the COB substrate 3) needs to be completely in contact with the heat sink, and the COB LED 1 is well cooled to ensure that the COB The life of LED 1 is shortened; when the cover of the fixing bracket 2 is put on the COB LED 1 with the front side facing upward, only the LED chip 4 can be seen through the viewing window 7, but 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 fit the square COB substrate 3 with a thickness of only 0.8mm-1.2mm into the square card slot 5 in a tightly corresponding manner, and there is no way to align it, which is basically a blind installation. At the same time, the wires need to be placed in the wire slot 6, which makes the installation even more difficult; since the COB substrate 3 is relatively thin, the installation is very difficult 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 providing a protrusion on the side wall of the card slot of the fixing bracket, or providing a card or spring piece on the side of the card slot, and fixing the COB substrate on the fixing bracket by interference fitting or clamping the side wall of the COB substrate. Although the COB LED is installed by flipping the fixing bracket to the bottom surface facing upward, the problem of blind installation is solved; but on the one hand, the thickness of the COB substrate is generally 0.8mm, 1.0mm, 1.2mm, and this thickness is relatively small, so the contact area between the protrusion, card, spring piece and the COB substrate is small, and the fitting force or clamping force is small; on the other hand, the fixing bracket is generally made of PC material, which is hard plastic, and the COB substrate is generally a ceramic substrate or an aluminum substrate, so it is difficult for the protrusion and the COB substrate to deform, and the fitting effect is not good; the COB LED is clamped on the fixing bracket by the protrusion, card, and spring piece, and after the front side of the fixing bracket is flipped upward, the COB LED will fall off under its own gravity when the fixing bracket moves to the radiator.

[0005] In the prior art, there is also a method of fixing the wires connected to the positive and negative electrodes on the COB substrate in the wire installation grooves in the fixed bracket, so that the COB substrate is installed in the slot through the pulling force of the wires on the COB substrate. This installation method is to flip the fixed bracket to the bottom side facing up to install the COB LED, which also solves the problem of blind installation. However, after the front side of the fixed bracket is flipped upward, due to the shallow slot and the small thickness of the COB substrate, under its own gravity, the COB LED is moved from the slot when the fixed bracket is moved to the heat sink.

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

[0007] The purpose of the present invention is to provide a fixing bracket for COB LED, so as to solve the problem in the prior art that when the fixing bracket is put on the COB LED, there is no way to align it, which is basically blind installation; when the COB LED is mounted on the fixing bracket by protrusions, cards, springs, and wire pulling force, the COB LED is easy to fall off or be misplaced.

[0008] The technical solution of the present invention is: 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 and an LED chip packaged on the COB substrate, wherein the top surface of the COB substrate is provided with a positive electrode and a negative electrode respectively connected to a positive electrode and a negative electrode of a power source, and the bottom surface of the fixing bracket is in the same plane, and the bottom surface of the fixing bracket is concave upwardly and provided with a wire groove for accommodating wires electrically connected to the positive electrode and the negative electrode 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 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.

[0009] 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; 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.

[0010] 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.

[0011] 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; 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.

[0012] Preferably, the card-mounting 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 base diameter and a gradually increasing diameter based on the diameter of the through slot, 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.

[0013] Preferably, 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.

[0014] Preferably, 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 accommodating 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 accommodating 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.

[0015] Preferably, there are two wire troughs, 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.

[0016] Preferably, a pair of countersunk screw holes are symmetrically opened 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.

[0017] Preferably, a pair of arc-shaped rotating grooves are symmetrically provided on the fixing bracket, and arc-shaped clamping plates are extended outward from the side edges of the upper ends of the inner walls of the rotating grooves.

[0018] Compared with the prior art, the advantages of the present invention are: (1) A fixing bracket for a COB LED in the present invention is provided with an elastic card assembly on the fixing bracket, the COB LED is fixed to the fixing bracket by the elastic card 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 after the COB LED is fixed on the heat sink, the elastic card assembly generates elastic deformation under the action of the top resistance force applied by the heat sink to release the COB LED, and makes the bottom surface of the COB substrate fit with the heat sink; the elastic card assembly includes a limit plate for limiting the edge of the COB substrate, and a warping plate connected to the limit plate to drive the limit plate to cancel the limit on the COB substrate and extend outward and downward. The present invention discloses a fixing bracket for a COB LED, wherein the COB LED is visibly fixedly mounted on the fixing bracket, and the COB LED will not fall off the fixing bracket when the fixing bracket is moved to the heat sink, and the COB substrate will not be misplaced after being installed on the card slot; the fixing bracket after the COB LED is carded is fixed on the heat sink, and the fixing bracket can release the COB LED to ensure that the COB substrate of the COB LED fits the heat sink; the problems of blind installation in the prior art, as well as falling off and misplacement after installation, are overcome, thereby improving installation efficiency.

[0019] (2) The COB LED in the present invention is fixed on the fixed bracket by an elastic card board assembly and the LED chip is exposed on the top surface of the fixed bracket. At this time, the bottom surface of the COB substrate is lower than the bottom surface of the fixed bracket; in the present invention, when the COB LED is fixed on the fixed bracket, the bottom surface of the COB substrate is lower than the bottom surface of the fixed bracket, which can ensure that when the fixed bracket after the COB LED is clamped is fixed on the heat sink, the bottom surface of the COB substrate is completely in contact with the heat sink; in the prior art, when the COB LED is fixed on the fixed bracket, the bottom surface of the COB substrate is flush with the bottom surface of the fixed bracket. In actual installation, due to the thickness tolerance of the COB substrate and the installation error, if they are flush, the bottom surface of the COB substrate may not be completely in contact with the heat sink, 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 be completely in contact with the heat sink, ensuring the life of the COB LED.

[0020] (3) A fixing bracket for a COB LED in the present invention has a protrusion with a length of 0.25 mm. In the present invention, the COB LED is fixed on the fixing bracket by the cooperation of a pair of limiting plates and a card slot. When the COB LED is fixed on the fixing bracket, the bottom surface of the fixing bracket needs to face upward. After the card installation, the front surface of the fixing bracket faces upward. The 0.25 mm length setting of the protrusion can ensure that the COB substrate overcomes the obstruction of the protrusion and is carded in the card slot. It 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 blocked and limited by the protrusion and is firmly fixed on the fixing bracket. When the fixing bracket is moved to the heat sink, the COB LED will not fall or shift. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 A schematic diagram of the front assembly structure of a COB LED installed on a fixed bracket in the prior art; Figure 2 A schematic diagram of the reverse assembly structure of a COB LED installed on a fixed bracket in the prior art; Figure 3 A schematic diagram of the front assembly structure of a fixing bracket for a COB LED according to the present embodiment, wherein the COB LED is installed on the fixing bracket; Figure 4 A schematic diagram of the reverse assembly structure of a fixing bracket for a COB LED according to the present embodiment, wherein the COB LED is mounted on the fixing bracket; Figure 5 is a schematic diagram of the three-dimensional structure of the fixing bracket described in this embodiment from a bottom-up perspective; Figure 6 is a schematic diagram of the three-dimensional structure of the fixing bracket described in this embodiment from a bottom-up perspective; Figure 7 The top view and right view of the fixing bracket described in this embodiment; Figure 8 A bottom view of the fixing bracket of this embodiment; Fig. 9 is a cross-sectional view of the fixing bracket described in this embodiment; Fig.10 This is a schematic diagram of the structure in which the fixing bracket after the COB LED is clamped is installed on the heat sink by screws according to this embodiment.

[0022] Wherein: 1. COB LED, 2. fixing bracket, 3. COB substrate, 4. LED chip, 5. card slot, 6. wire slot, 7. window, 8. heat sink, 9. bottom of the first slot, 10. side of the first slot, 11. bottom of the second slot, 12. side of the second slot, 13. through slot, 14. tapered slot, 15. first accommodating space, 16. second accommodating space, 17. first elastic card board assembly, 18. first warping plate, 19. first limiting plate, 20. first clamping protrusion, 21. second elastic card board assembly, 22. second warping plate, 23. second limiting plate, 24. second clamping protrusion, 25. first countersunk screw hole, 26. second countersunk screw hole, 27. rotary slot. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with specific embodiments: In the description of the invention, it is necessary to understand that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0024] like Figure 3-Figure 8 As shown, a fixing bracket 2 for a COB LED 1 is used, and the fixing bracket 2 fixes the COB LED 1 on a heat sink 8; the COB LED 1 includes a COB substrate 3, an LED chip 4 ( Figure 3 The top surface of the COB substrate 3 is provided with a positive electrode and a negative electrode respectively connected to the positive electrode and the negative electrode of the power supply, and the bottom surface of the fixed bracket 2 is in the same plane. The bottom surface of the fixed bracket 2 is upwardly concave and provided with a wire groove 6 for accommodating wires electrically connected to the positive electrode and the negative electrode of the COB substrate 3; the fixed bracket 2 is provided with an elastic card assembly, and the COB LED 1 is fixed to the fixed bracket 2 through the elastic card 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 (such as Fig.10As shown), specifically, when the COB LED 1 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 LED 1 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 after the COB LED 1 is clamped is fixed on the radiator 8, the bottom surface of the COB substrate 3 is completely fitted with the radiator 8. In the prior art, when the COB LED 1 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 thickness tolerance of the COB substrate 3 and the installation error, if they are flush, the bottom surface of the COB substrate 3 may not be completely fitted with the radiator 8, which affects the heat dissipation of the COB LED 1 and further affects the life of the COB LED 1; the clamped COB When the fixing bracket 2 behind the LED 1 is fixed on the radiator 8 (in the present embodiment, the fixing bracket 2 is fixed on the radiator 8, which means that the bottom surface of the COB substrate 3 is in contact with the radiator 8, and the state when the screws fixing the fixing bracket 2 are screwed to the bottom is that the fixing bracket 2 is fixed on the radiator 8), the elastic card assembly generates elastic deformation under the action of the top resistance force applied by the radiator 8 to loosen the COB LED 1, and make the bottom surface of the COB substrate 3 in contact with the radiator 8.

[0025] The difficulty of the present invention lies in how to realize the visible fixed installation of COB LED1 on the fixing bracket 2, and the COB LED1 will not fall off the fixing bracket 2 on the way of moving the fixing bracket 2 to the heat sink 8, and the COB substrate 3 will not be misplaced after being installed on the card slot 5, so as to improve the installation efficiency; and then fix the fixing bracket 2 after the COB LED1 is clamped on the heat sink 8, and the fixing bracket 2 can loosen the COB LED1 to ensure that the COB substrate 3 of the COB LED1 fits with the heat sink 8; that is, how to set a structure on the fixing bracket 2, which can not only ensure the visible clamping of COB LED1, but also loosen the clamping COB LED1 when the fixing bracket 2 after the COB LED1 is clamped on the heat sink 8, and make the bottom surface of the COB substrate 3 completely fit with the heat sink 8; overcome the problems of blind installation in the prior art, as well as falling and misplacement after installation, and improve the installation efficiency; the conception of the specific structure of the fixing bracket 2 is the difficulty of the present invention.

[0026] The fixing bracket 2 is provided with a mounting groove that matches the shape of the COB LED 1. After the COB LED 1 is placed in the mounting groove, the COB substrate 3 is limited by the elastic clamping plate assembly to achieve the COB LED 1 being 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 limiting of the COB substrate 3; the driving force of the driving portion comes from the top resistance applied by the heat sink 8 when the fixing bracket 2 after the COB LED 1 is clamped is fixed on the heat sink 8. There are two elastic card plate assemblies, which are arranged on opposite sides of the card slot; each limiting part is a limiting plate, and a rectangular notch is provided at the top of the edge of the limiting plate on the side of the card slot to form a stepped card protrusion at the lower end of the corresponding edge, and the rectangular notch forms the bottom surface and side surface of the slot; the corresponding two limiting parts are respectively recorded as the first slot bottom surface 9 and the first slot side surface 10, the second slot bottom surface 11 and the second slot side surface 12; each driving part 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 2; the fixed bracket 2 is provided with an accommodating space that allows the limiting part and the driving part to deform; when the fixed bracket 2 after the COB LED1 is clamped is fixed on the heat sink 8, the limiting part and the driving part are elastically deformed under the top resistance of the heat sink 8, 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 length H of the card protrusion is 0.25㎜ (such as Figure 7 As shown), in this embodiment, the COB LED 1 is fixed on the fixed bracket 2 by the cooperation of a pair of limiting plates and the card-mounting groove. When the COB LED 1 is fixed on the fixed bracket 2, the bottom surface of the fixed bracket 2 needs to face upwards. After the card-mounting is completed, the front surface of the fixed bracket 2 faces upwards. The 0.25mm length setting of the card protrusion can ensure that the COB substrate 3 overcomes the obstruction of the card protrusion and is carded in the following card slot 5. It can also ensure that after the front surface of the fixed bracket 2 is flipped upwards, the edge of the COB substrate 3 of the COB LED1 is blocked and limited by the card protrusion, and it is firmly fixed on the fixed bracket 2. When the fixed bracket 2 moves to the heat sink 8, the COB LED 1 will not fall or shift.

[0027] like Fig. 9As shown, the card-mounting slot includes a card slot 5 with a square cross-section that matches the COB substrate 3, a through slot 13 that matches the LED chip 4 and accommodates the LED chip 4 to pass through, and a tapered slot 14 with a diameter of the through slot 13 as a basic diameter and a gradually increasing diameter. 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 a fixed bracket 2 body is provided here, the light emission of the LED chip 4 will be blocked; the groove depth of the card slot 5 is less than the thickness of the COB substrate 3, to correspond to the aforementioned description of "an elastic card board assembly is provided on the fixed bracket 2, the COB LED1 is fixed on the fixed bracket 2 through the elastic card board assembly and the LED chip 4 is exposed on the top surface of the fixed bracket 2, and 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.

[0028] The vertical spacing between the first groove bottom surface 9 and the groove bottom surface of the card slot 5 matches the thickness of the COB substrate 3, and the vertical spacing between the second groove bottom surface 11 and the groove bottom surface of the card slot 5 matches the thickness of the COB substrate 3; the vertical spacing between the first groove side surface 10 and the second groove side surface 12 matches the side length of the COB substrate 3; the first groove side surface 10 and the inner wall of one side of the card slot 5 are in the same vertical plane, and the second groove side surface 12 and the inner wall of the other side of the card slot 5 are in the same vertical plane. Through the above arrangement, the COB substrate 3 is installed in the card slot 5 and is limited by the card convex so as not to fall out of the card slot 5.

[0029] The warping plate is formed by the fixing bracket 2 body forming the through groove 13, which extends outward and downward at the same time. The fixing bracket 2 is penetrated to open a first accommodation space 15 that allows the warping plate to deform; the limiting plate is formed by horizontally extending inward with the warping plate as the base point, and the warping plate is penetrated to open 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 fixing bracket 2. In this embodiment, when the fixing bracket 2 after the COB LED 1 is clamped and fixed to the heat sink 8 by screws, the warping plate is deformed by the top of the heat sink 8, driving the limiting plate to move, so that a pair of limiting plates gradually loosen the COB substrate 3 of the COB LED 1. When the two screws fixing the fixing bracket 2 are all tightened, the COB substrate 3 of the COB LED 1 is completely attached to the heat sink 8.

[0030] When fixing the fixing bracket 2 after the COB LED 1 is clamped on the heat sink 8, two screws are used to fix the fixing bracket 2 on the heat sink 8. Since the lowest point of the warping plate is lower than the bottom surface of the fixing bracket 2 in the natural state, the warping plate applies a pressure to the heat sink 8 during the screwing process, and the heat sink 8 applies a resisting force to the warping plate. In this embodiment, Figure 7As shown in (a), the fixing bracket 2 is disc-shaped, and two countersunk screw holes are on the diameter A of the fixing bracket 2, which are respectively marked as the first countersunk screw hole 25 on the left and the second countersunk screw hole 26 on the right; there are two elastic card assembly, which are respectively marked as the first elastic card assembly 17 and the second elastic card assembly 21, the warping plate and the limit plate on the first elastic card assembly 17 are marked as the first warping plate 18 and the first limit plate 19, and the clamping protrusion on the first limit plate 19 is marked as the first clamping protrusion 20; the second elastic card assembly 2 1 is marked as a second warping plate 22 and a second limiting plate 23, and the clamping protrusion on the second limiting plate 23 is marked as a second clamping protrusion 24; wherein the first elastic clamping plate assembly 17 and the second elastic clamping plate assembly 21 are centrally symmetrically arranged on the fixed bracket 2, and the first elastic clamping plate assembly 17 and the second elastic clamping plate assembly 21 are arranged on both sides of the diameter B perpendicular to the diameter A, wherein 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.

[0031] There are two wire grooves 6, which are symmetrically arranged on the bottom surface of the fixed bracket 2; the clamping groove 5 and the through groove 13 are connected to the two wire grooves 6. A pair of countersunk screw holes are symmetrically arranged on the fixed bracket 2, and each countersunk screw hole includes a first through hole and a second through hole whose diameter decreases from top to bottom. A pair of arc-shaped rotating grooves 27 are symmetrically arranged on the fixed bracket 2, and the side edges of the upper ends of the inner walls of the rotating grooves 27 extend outwardly to form an arc-shaped clamping plate. In this embodiment, the rotating grooves 27 are used to clamp the reflective cup, so as to realize the detachable installation of the reflective cup, and the installation is more convenient.

[0032] The method of using a fixing bracket 2 for a COB LED 1 of the present invention is as follows: in an initial state, the positive electrode and the negative electrode of the COB substrate 3 are connected to the positive electrode and the negative electrode of the power supply through wires (such as Figure 3 As shown, the positive and negative electrodes 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 upward. The LED chip 4 in the COB LED 1 is partially passed through the through slot 13 of the card slot. A pair of diagonals of the connecting wires are aligned with the wire slot 6. The COB substrate 3 of the COB LED 1 overcomes the obstruction of the first card protrusion 20 and the second card protrusion 24 and is carded into the card slot 5 (as shown in FIG. Figure 4 As shown), fix the COB LED 1 on the fixing bracket 2, then turn the fixing bracket 2 upside down (the LED chip 4 of the COB LED 1 is partially exposed); next, Figure 7 The direction of is referenced, such as Figure 7In the direction of (a) in the figure, fix the fixing bracket 2 on the heat sink 8. Specifically, first place the fixing bracket 2 with the COB LED 1 mounted on it on the heat sink 8, hold the fixing bracket 2 with your hand, put the first screw into the second countersunk screw hole 26 on the right, and pre-tighten the first screw (the first screw does not need to be tightened too much, stop when it is slightly unable to be tightened). 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 heat sink; then Figure 7 In the direction (b), during the process, the first warping plate 18 and the second warping plate 22 slightly swing toward the first accommodating space 15 with their roots as the base points, and 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, and 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 first screw is pre-tightened, the fixing bracket 2 is tilted to the maximum. During the pre-tightening of the first screw, the first elastic card assembly 17 and the second elastic card assembly 21 undergo slight elastic deformation, and the COB substrate 3 of the COB LED 1 is still fixed in the card mounting slot; as shown in FIG. Figure 7 In the direction of (a), insert the second screw into the first countersunk screw hole 25 on the left; then 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 toward the first accommodating space 15 with their roots as base points, and the second warping plate 22 then drives the second limiting plate 23 to move upward and to the left from the vertical state, and 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 LED1 gradually fits the heat sink 8, and the first clamping protrusion 20 and the second clamping protrusion 24 gradually separate from the COB substrate 3. When the second screw is completely screwed in, the COB substrate 3 of the COB LED1 basically fits the heat sink 8; finally, the first screw is screwed to the bottom, and the COB substrate 3 of the COB LED1 is completely fitted to the heat sink 8; at the same time, the first warping plate 18 and the second warping plate 22, the first clamping protrusion 20, and the second clamping protrusion 24 fit the heat sink 8 (finally as shown in FIG. Fig.10 as shown).

[0033] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection 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 the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in 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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