Novel PI reinforcement-based flexible CSP lamp strip
By installing PI reinforcement behind the flexible FPC circuit board of the flexible CSP light strip and using fixed components and tensile parts at the connection, the problem of poor bending performance of the flexible CSP light strip is solved, and a high power, high brightness and long cascade length light strip can be realized, which can replace the traditional SMD light bead process.
Patent Information
- Application Number
- CN202421834175.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-31
AI Technical Summary
When the existing flexible CSP lamp strips increase power and ground length, their bending resistance is poor, resulting in poor dead lamps and limited brightness, which cannot completely replace the traditional SMD lamp bead process.
Using a flexible CSP light strip based on PI reinforcement, the PI reinforcement is added behind the flexible FPC circuit board to enhance bending resistance, and use fixed components and tensile parts at the connection to ensure stability and sealing at the connection.
It significantly improves the bending resistance and connection stability of the flexible FPC circuit board, and realizes a high power, high brightness and long cascade length lamp strip, which can replace the traditional SMD lamp bead process.
Smart Images
Figure CN222911461U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of LED strip lights, and more specifically, to a novel flexible CSP strip light based on PI reinforcement. Background Art
[0002] A flexible LED strip light is an LED strip light with high bending performance, having an upscale and delicate appearance. It is applicable to lighting places such as jewelry, display counters, home villas for lighting, decoration lighting in shopping malls, hotels, and office building leisure places, and is an ideal lamp to replace traditional fluorescent tubes.
[0003] Through investigation, it is found that many so-called flexible CSP strip lights on the current market are actually not flexible. In order to achieve higher power and longer connection lengths, there is a contradictory relationship between thickening the copper foil to reduce voltage drop and anti-bending tests. Thickening the copper foil of the flexible FPC circuit board can reduce voltage drop, increase power, and increase the connectable length, but the anti-bending performance is poor and dead lamp defects are likely to occur. Currently, the flexible FPC circuit boards on the market generally use a maximum of 1 ounce on both the front and back sides. Due to the large voltage drop, it is inevitable that the length cannot be very long, and at the same time, the power cannot be very high. As a result, the brightness per meter of the flexible FPC circuit board has limitations and cannot completely replace the traditional SMD lamp bead process. Summary of the Utility Model
[0004] The problem to be solved by the novel flexible CSP strip light based on PI reinforcement provided by the utility model is that many so-called flexible CSP strip lights on the current market are actually not flexible. In order to achieve higher power and longer connection lengths, there is a contradictory relationship between thickening the copper foil to reduce voltage drop and anti-bending tests. Thickening the copper foil of the flexible FPC circuit board can reduce voltage drop, increase power, and increase the connectable length, but the anti-bending performance is poor and dead lamp defects are likely to occur. Currently, the flexible FPC circuit boards on the market generally use a maximum of 1 ounce on both the front and back sides. Due to the large voltage drop, it is inevitable that the length cannot be very long, and at the same time, the power cannot be very high. As a result, the brightness per meter of the flexible FPC circuit board has limitations and cannot completely replace the traditional SMD lamp bead process.
[0005] To achieve the above object, the utility model provides the following technical solution: A novel flexible CSP strip light based on PI reinforcement, comprising a flexible FPC circuit board, a bridge rectifier device, CSP lamp beads, 0402 chip resistors, a transparent sealing soft colloid, high-reflectivity white PI films on both the front and back sides, and PI reinforcement. The bridge rectifier device, CSP lamp beads, 0402 chip resistors, transparent sealing soft colloid, high-reflectivity white PI films on both the front and back sides, and PI reinforcement are all installed on the flexible FPC circuit board. The CSP lamp beads are sleeved inside the cavity of the transparent sealing soft colloid. The PI reinforcement is installed on the back of the flexible FPC circuit board. A fixing component is detachably provided at the connection end of every two flexible FPC circuit boards;
[0006] The fixing assembly includes a screw, a connecting plate and a tensile member. The connecting plate is slidably arranged in the inner cavity of the mounting seat through the screw, the connecting plate is rotatably connected to the screw, the screw thread sleeve is arranged on the surface of the mounting seat, and one end passes through the mounting seat to communicate with the outside world, and the tensile member is arranged on both sides of the mounting seat, so as to solve the problem that conventional flexible CSP light strips cannot be made into high brightness, high power, low voltage drop and cascaded long light strips because the copper foil cannot be made thick.
[0007] In a preferred embodiment, the tensile assembly includes a limit groove, a tensile positioning plate and a connecting frame. The tensile positioning plate is connected to the mounting seat through the limit groove. The limit grooves are symmetrically fixed on both sides of the mounting seat. The limit grooves are slidably sleeved on the outside of the tensile positioning plate. The tensile positioning plate is fixedly connected to the connecting plate through the connecting frame, which is beneficial to prevent water from entering the connection of the flexible FPC circuit board and improve the practicality of the device.
[0008] In a preferred embodiment, the tensile member also includes a conical positioning frame and a telescopic rod. The conical positioning frame is connected to the connecting frame via the telescopic rod. The telescopic rod is telescopic. The telescopic rod is fixedly mounted on the side of the connecting frame away from the flexible FPC circuit board. The conical positioning frame is fixedly sleeved on the other end of the telescopic rod. The conical positioning frame is fixedly connected to the inner wall of the flexible FPC circuit board, which is beneficial to improving the tensile resistance of the tensile positioning plate.
[0009] In a preferred embodiment, an anti-skid layer is provided on the side of the connecting plate facing away from the screw rod, and the anti-skid layer is fixedly connected to the connecting plate, which is beneficial to improving the stability of the flexible FPC circuit board when it is installed inside the mounting seat.
[0010] In a preferred embodiment, a sealing layer is provided on the outer side of the tensile positioning plate, and the tensile positioning plate is fixedly connected to the sealing layer, which is beneficial to improve the sealing performance of the mounting seat to the connection end of the flexible FPC circuit board.
[0011] Technical effects and advantages of the utility model:
[0012] The utility model enhances the bending resistance of the flexible FPC circuit board by adding PI reinforcement at the back of the flexible FPC circuit board, and has greatly improved the relevant indicators in the reliability tests of curling, whipping, twisting, etc. compared with the conventional flexible FPC circuit board, and uses a mounting seat at the connection points at both ends of the flexible FPC circuit board to prevent bending and separation at the connection points, and prevents the connection points of the flexible FPC circuit board from separating after connection through a tensile member, thereby improving the stability of the connection points of the flexible FPC circuit board. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a top view schematic diagram of the flexible FPC circuit board of the utility model;
[0014] Figure 2Schematic side view of the flexible FPC circuit board of the present utility model;
[0015] Figure 3 Schematic back view of the flexible FPC circuit board of the present utility model;
[0016] Figure 4 Schematic installation structure diagram of the mounting seat of the present utility model;
[0017] Figure 5 Schematic cross-sectional view of the mounting seat of the present utility model;
[0018] Figure 6 Schematic enlarged structure diagram of part A in the mounting seat of the present utility model as shown in the figure.
[0019] Reference numerals in the drawings are: 1, flexible FPC circuit board; 2, bridge rectifier device; 3, CSP lamp bead; 4, 0402 chip resistor; 5, transparent sealing soft colloid; 6, high-reflectivity white PI film on both front and back sides; 7, PI reinforcement; 8, mounting seat; 81, screw; 82, connecting plate; 821, anti-slip layer; 83, connecting frame; 84, limiting groove; 841, tensile positioning plate; 842, sealing layer; 85, telescopic rod; 86, conical positioning frame. Detailed implementation manners
[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0021] Embodiment
[0022] Referring to the attached drawings of the specification Figures 1-6 , a novel flexible CSP lamp strip based on PI reinforcement includes a flexible FPC circuit board 1, a bridge rectifier device 2, CSP lamp beads 3, 0402 chip resistors 4, a transparent sealing soft colloid 5, a high-reflectivity white PI film 6 on both front and back sides, and a PI reinforcement 7. The bridge rectifier device 2, CSP lamp beads 3, 0402 chip resistors 4, transparent sealing soft colloid 5, high-reflectivity white PI film 6 on both front and back sides, and PI reinforcement 7 are all installed on the flexible FPC circuit board 1. The CSP lamp beads 3 are sleeved in the inner cavity of the transparent sealing soft colloid 5. The PI reinforcement 7 is installed on the back of the flexible FPC circuit board 1. A fixing component is detachably arranged at the connection end of every two flexible FPC circuit boards 1;
[0023] The fixing component includes a screw 81, a connecting plate 82 and a tensile member. The connecting plate 82 is slidably arranged in the inner cavity of the mounting seat 8 through the screw 81. The connecting plate 82 is rotatably connected to the screw 81. The screw 81 is threadedly sleeved on the surface of the mounting seat 8 and one end thereof passes through the mounting seat 8 to communicate with the outside. The tensile member is arranged on both sides of the mounting seat 8.
[0024] It should be noted that this product is mainly applicable to AC24V power supply. It can also be used normally with DC24V. When powered by AC24V, the bridge rectifier device 2 rectifies the AC into DC and supplies power to the CSP lamp beads 3. The 0402 chip resistor 4 divides and limits the voltage after rectification to reach the predetermined supply current value of the bridge rectifier device 2, so as to realize that the power of the overall CSP product is within the designed range. The transparent sealing soft colloid 5 wraps the CSP lamp beads 3, playing a role in sealing dust and preventing external force from touching and pressing the CSP lamp beads 3. The high-reflectivity white PI films 6 on both the front and back increase the light output reflectivity and provide the overall light efficiency. The PI reinforcement 7 solves the problems of low power, inability to connect for a long length and poor anti-bending performance existing in the current common flexible FPC circuit board 1.
[0025] In the above embodiment, the specific technical solution is as follows: when powered by AC24V, the bridge rectifier circuit composed of four rectifier diodes rectifies the AC into DC and supplies power to the CSP lamp beads 3. The 0402 chip resistor 4 divides and limits the voltage after rectification to reach the predetermined current value of the CSP lamp beads 3, so as to realize that the power of the overall CSP product is within the designed range. The back of the flexible FPC circuit board 1 is reinforced by the PI reinforcement 7 to enhance the anti-bending ability of the board, and the flexible FPC circuit board 1 can adopt the solution of thickening the copper foil to solve the problems of high power, high brightness and long cascade length.
[0026] After understanding the mechanical principle that a single chopstick is easy to bend and break while two chopsticks are not, combined with the product structure characteristics of PI reinforcement 7: high-strength PI film + adhesive + release paper, and PI reinforcement 7 of different models and different thicknesses, the product structure and model of PI reinforcement 7, using HS200.25SWA, through multiple proofing and various index tests of laboratory reliability, and considering the cost performance comprehensively, finally select PI reinforcement 7 with a thickness of 0.2MM, model: HS200.25SWA, and the designed width is 2MM. This width can completely support all CSP lamp beads 3 on the back of the flexible FPC circuit board 1. PI reinforcement 7 is pressed onto the back of the flexible FPC circuit board 1 by external force of equipment to enhance the strength of the board. Because it has two important product performances, the product performances of PI reinforcement 7: First, this PI reinforcement 7 has a peel strength of ≥0.7Kgf / cm2, and general external forces will not cause deformation or separation of PI reinforcement 7, so it will not affect the strength of the flexible FPC circuit board 1; Second, it can be repeated 3 times without performance changes such as bending and deformation at a high temperature of 288° for 10 seconds. This index is very crucial because the flexible FPC circuit board 1 must pass through high-temperature reflow soldering, and the highest temperature will reach about 260°. Finally, it can completely pass the laboratory drop test. Install the lit 1-meter light strip on the drop test machine for testing. The swing amplitude of the swing arm of the drop test machine is 200MM, and test 1000 times without abnormal lamp beads or distortion. Install the lit 1-meter light strip on the torsion test machine for testing. Set 720° forward rotation and 720° reverse rotation as 1 cycle, and test 1000 times without abnormal lamp beads or curling. Install the lit 1-meter light strip on the curling test machine for testing. The reel diameter is 60MM, the winding travel of the light strip for 360° is 700mm, and the round trip is 1 time. Test 1000 times without abnormal physical performance indexes such as lamp beads, solving the technical bottleneck of the high connection length brought by the high power, high luminous efficiency, and low voltage drop of the flexible FPC circuit board 1.
[0027] When connecting two flexible FPC circuit boards 1, insert the flexible FPC circuit board 1 into the inner cavity of the mounting seat 8, and rotate the screw 81 to adjust the connecting plate 82 to drive the anti-slip layer 821 to fasten with the flexible FPC circuit board 1. Position the connection of the flexible FPC circuit board 1 through the connecting plate 82 and the tensile member to prevent bending and separation at the connection, and prevent the connection of the flexible FPC circuit board 1 from separating after connection through the tensile member, improving the stability of the connection of the flexible FPC circuit board 1.
[0028] Furthermore, the tensile assembly includes a limiting groove 84, a tensile positioning plate 841, and a connecting frame 83. The tensile positioning plate 841 is connected to the mounting seat 8 through the limiting groove 84. The limiting grooves 84 are symmetrically and fixedly arranged on both sides of the mounting seat 8. The limiting grooves 84 are slidably sleeved outside the tensile positioning plate 841. The tensile positioning plate 841 is fixedly connected to the connecting plate 82 through the connecting frame 83.
[0029] In the above embodiment, the connection plate 82 is adjusted to move while driving the tensile positioning plate 841 to move, and the flexible FPC circuit board 1 is positioned in two sections to increase the contact area between the mounting seat 8 and the flexible FPC circuit board 1, thereby improving the stability of the flexible FPC circuit board 1 during connection. The flexible FPC circuit board 1 can be positioned by the tensile positioning plate 841 while sealing both sides of the mounting seat 8, thereby preventing water from entering the connection of the flexible FPC circuit board 1, thereby improving the practicality of the device.
[0030] Furthermore, the tensile member also includes a conical positioning frame 86 and a telescopic rod 85. The conical positioning frame 86 is connected to the connecting frame 83 through the telescopic rod 85. The telescopic rod 85 is retractable. The telescopic rod 85 is fixedly installed on the side of the connecting frame 83 away from the flexible FPC circuit board 1. The conical positioning frame 86 is fixedly sleeved on the other end of the telescopic rod 85. The conical positioning frame 86 is fixedly connected to the inner wall of the flexible FPC circuit board 1.
[0031] In the above embodiment, the connection of the telescopic rod 85 by the conical positioning frame 86 improves the stability of the installation of the connecting frame 83, thereby improving the tensile resistance of the tensile positioning plate 841.
[0032] Furthermore, an anti-skid layer 821 is provided on a side of the connecting plate 82 facing away from the screw rod 81 , and the anti-skid layer 821 is fixedly connected to the connecting plate 82 .
[0033] In the above embodiment, the anti-slip layer 821 is used to increase the resistance when the connection plate 82 and the flexible FPC circuit board 1 are positioned, thereby improving the stability of the flexible FPC circuit board 1 when it is installed inside the mounting seat 8 .
[0034] Furthermore, a sealing layer 842 is provided on the outer side of the tensile positioning plate 841 , and the tensile positioning plate 841 is fixedly connected to the sealing layer 842 .
[0035] In the above embodiment, the flexible FPC circuit board 1 and the mounting seat 8 are sealed by the sealing layer 842 , thereby improving the sealing performance of the mounting seat 8 to the connection end of the flexible FPC circuit board 1 .
[0036] In this embodiment, the implementation scenario is specifically as follows: When powered by alternating current (AC) 24V, the bridge rectifier device 2 rectifies the AC power supply and outputs direct current (DC) to power the CSP lamp beads 3. The 0402 chip resistor 4 divides the voltage after rectification to limit the current and achieve the predetermined supply current value of the bridge rectifier device 2, thereby enabling the power of the overall CSP product to be within the designed range. The transparent sealing soft colloid 5 wraps the CSP lamp beads 3, serving to seal dust and prevent external forces from touching and pressing on the CSP lamp beads 3. The highly reflective white PI films 6 on both the front and back sides increase the light output reflectivity and provide the overall light efficiency. The PI reinforcement 7 solves the problems commonly existing in the current flexible FPC circuit board 1, such as low power, inability to be connected for a long length, and poor anti-bending performance. When connecting two flexible FPC circuit boards 1, insert the flexible FPC circuit board 1 into the inner cavity of the mounting seat 8. Rotate the screw 81 to adjust the connecting plate 82 to drive the anti-slip layer 821 to fasten to the flexible FPC circuit board 1. Position the connection of the flexible FPC circuit board 1 through the connecting plate 82 and the tensile member to prevent bending and separation at the connection, and use the tensile member to prevent the connection of the flexible FPC circuit board 1 from separating after connection, thereby improving the stability of the connection of the flexible FPC circuit board 1.
[0037] Finally, the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
Claims
1. A new type of flexible CSP light strip based on PI reinforcement, characterized by: The invention comprises a flexible FPC circuit board (1), a bridge rectifier device (2), a CSP lamp bead (3), a 0402 chip resistor (4), a transparent sealed soft colloid (5), a highly reflective white PI film (6) on both sides, and a PI reinforcement (7); the bridge rectifier device (2), the CSP lamp bead (3), the 0402 chip resistor (4), the transparent sealed soft colloid (5), the highly reflective white PI film (6) on both sides, and the PI reinforcement (7) are all installed on the flexible FPC circuit board (1); the CSP lamp bead (3) is sleeved in the inner cavity of the transparent sealed soft colloid (5); the PI reinforcement (7) is installed on the back of the flexible FPC circuit board (1); and each two connection ends of the flexible FPC circuit boards (1) are detachably provided with a fixing component; The fixing assembly comprises a screw rod (81), a connecting plate (82) and a tensile member, wherein the connecting plate (82) is slidably arranged in the inner cavity of the mounting seat (8) through the screw rod (81), the connecting plate (82) is rotationally connected to the screw rod (81), the screw rod (81) is threadedly sleeved on the surface of the mounting seat (8), and one end of the screw rod passes through the mounting seat (8) to communicate with the outside, and the tensile member is arranged on both sides of the mounting seat (8).
2. According to claim 1, a novel PI-reinforced flexible CSP light strip is characterized in that: The tensile member comprises a limiting groove (84), a tensile positioning plate (841) and a connecting frame (83); the tensile positioning plate (841) is connected to the mounting seat (8) via the limiting groove (84); the limiting groove (84) is symmetrically fixedly arranged on both sides of the mounting seat (8); the limiting groove (84) is slidably sleeved on the outside of the tensile positioning plate (841); and the tensile positioning plate (841) is fixedly connected to the connecting plate (82) via the connecting frame (83).
3. According to claim 2, a new type of PI-reinforced flexible CSP light strip, characterized in that: The tensile member further comprises a conical positioning frame (86) and a telescopic rod (85); the conical positioning frame (86) is connected to the connecting frame (83) via the telescopic rod (85); the telescopic rod (85) is telescopic; the telescopic rod (85) is fixedly mounted on a side of the connecting frame (83) away from the flexible FPC circuit board (1); the conical positioning frame (86) is fixedly sleeved on the other end of the telescopic rod (85); and the conical positioning frame (86) is fixedly connected to the inner wall of the flexible FPC circuit board (1).
4. According to claim 3, a new type of PI-reinforced flexible CSP light strip is characterized in that: An anti-slip layer (821) is provided on the side of the connecting plate (82) facing away from the screw rod (81), and the anti-slip layer (821) is fixedly connected to the connecting plate (82).
5. According to claim 4, a new type of PI-reinforced flexible CSP light strip, characterized in that: A sealing layer (842) is provided on the outer side of the tensile positioning plate (841), and the tensile positioning plate (841) is fixedly connected to the sealing layer (842).