A manufacturing method of a high-enclosure COB lamp strip
By creating a shared whole-board dam on the entire circuit board and cutting it into a single COB light strip, the problems of large light output angle and unconcentrated light of existing COB light strips are solved, and a COB light strip with small light output angle and concentrated light is achieved, which is suitable for wall washer lights or floodlights.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-08
- Publication Date
- 2026-06-19
AI Technical Summary
The limited height of existing COB light strips results in a light output angle greater than 140 degrees, which cannot meet the requirements of applications with small light output angles and concentrated light, such as wall washer lights or floodlights.
A shared whole-board enclosure is made on the whole circuit board, and after the light strip is made, it is cut along the center of the enclosure to form a single COB light strip. The height to width ratio of a single enclosure is increased to 2.5:1 to 3.5:1, and the light output angle can be adjusted to 15 degrees.
COB light strips with a narrower beam angle are now available, making them suitable for applications such as wall washer lights or floodlights, and the width of the light strip has been reduced.
Smart Images
Figure CN122236972A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to decorative lighting strips, specifically to a method for manufacturing a high-dam COB lighting strip. Background Technology
[0002] COB (Chip on Board) LED strips refer to LED strips formed by directly soldering unencapsulated LED chips onto a circuit board. The existing manufacturing method for COB LED strips is as follows: First, multiple LED strip circuit patterns are fabricated on a circuit board substrate 01, and micro-tangents are created between each circuit pattern (by drilling holes or cutting thinner sections along predetermined lines on the circuit board) to facilitate subsequent slitting. Then, a set of LED chips 03 is soldered onto each circuit pattern, with each set of chips constituting one COB LED strip. Next, two independent dams 02 are created on both sides of each micro-tangent. Simultaneously, two independent dams 02 are created on the outer sides of the two sets of LED chips at the left and right edges, creating two dams between the two sets of chips. Then, fluorescent colloid 04 is coated onto the LED chips 03 between the two dams 02. Finally, the COB LED strips are torn into strips along the micro-tangents.
[0003] The dam 02 serves two purposes: preventing the leakage of fluorescent colloid 04 and adjusting the light emission angle of the light strip. According to optical principles, when the interval between two dams is constant, the light emission angle of the light strip is inversely proportional to the height of the dams. Because the silicone used to make the dam 02 is soft, its height-to-width ratio can only be maintained at approximately 3:1 due to gravity. Increasing the dam height requires increasing the width of the dam's base, but increasing the base width leads to a larger light strip width. Therefore, in existing technology, the dam height of COB light strips can only be around 3.4 mm, and its light emission angle is generally greater than 140 degrees. Due to the large light emission angle, the light is not concentrated, making it unsuitable for applications requiring a small light emission angle and concentrated light, such as wall washer lights or floodlights. Furthermore, in existing technology, a micro-tangential gap needs to be reserved between the two sets of light-emitting chips, which increases the width of the circuit board or light strip. Summary of the Invention
[0004] The purpose of this invention is to provide a method for manufacturing COB light strips for high dams, so as to solve the technical problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: 1) fabricating multiple sets of COB light strip circuit patterns on a whole board circuit board substrate; 2) soldering a set of LED light-emitting chips on each set of circuit patterns; 3) fabricating a shared whole board dam between each pair of adjacent sets of LED light-emitting chips, and fabricating a whole board dam on the outer side of each pair of light-emitting chips at the edge of the whole board circuit board; 4) cutting and decomposing the whole board circuit board along the length of the whole board dam to form multiple single COB light strips.
[0006] The beneficial effects of this invention are as follows: This invention only manufactures a single-plate dam between two sets of LED light-emitting chips, and then cuts it from the center of the single-plate dam after the light strip is manufactured to form two single dams for COB light strips. The height or aspect ratio of the single dam is higher than that of the prior art, and its light emission angle is smaller. It can achieve a COB light strip with a light emission angle of up to 15 degrees, which is suitable for applications such as wall washer lights or floodlights that require a small light emission angle and concentrated light.
[0007] As a further improvement of the present invention: between steps 3) and 4), a process of coating the light-emitting chip with fluorescent colloid is included. The height of the fluorescent colloid is lower than the height of the entire board dam. The height-to-width ratio of the entire board dam is 2.5:1 to 3.5:1. The height-to-width ratio of the entire board dam is 3:1. The lower limit of the light emission angle of the COB light strip is 15 degrees. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of the cross-section of an existing COB LED strip before it is slit.
[0009] Figure 2 This is a cross-sectional schematic diagram of the present invention after the LED light-emitting chip is installed on the circuit board.
[0010] Figure 3 This is a schematic diagram of the cross-section of the dam fabricated on the circuit board according to the present invention.
[0011] Figure 4 This is a schematic cross-sectional view of the LED light-emitting chip after phosphor is coated on it according to the present invention.
[0012] Figure 5 This is a schematic diagram of the COB LED strip after it has been slit.
[0013] Figure 6 for Figure 5 One of the structural schematic diagrams of section AA in the middle.
[0014] Figure 7 for Figure 5 The second structural schematic diagram of section AA. Detailed Implementation
[0015] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.
[0016] refer to Figure 1 This invention is described using the manufacture of white COB light strips as an example only. Those skilled in the art will know that it can also be applied when manufacturing COB light strips of other luminous colors.
[0017] A method for manufacturing COB light strips for high dams: Step 1, refer to Figure 2 Multiple sets of parallel COB LED strip circuit patterns 11 are fabricated on a whole circuit board substrate. Each set of circuit patterns 11 constitutes the circuit pattern of an independent COB LED strip 10. Specifically, a circuit board substrate with a base film on one side and copper foil attached to the other side is selected. Then, multiple sets of circuit patterns 11 are fabricated on the copper foil by etching or die-cutting. A film is then applied to the multiple sets of circuit patterns 11 to cover and insulate the areas where electronic components do not need to be soldered. After the circuit pattern and film are completed on the circuit board substrate, the circuit board 1 of the COB LED strip is formed.
[0018] Step 2, refer to Figure 2 A set of LED chips 2 are soldered onto each circuit pattern 11. Each set of LED chips 2 may include one or more columns or staggered arrangements. Resistors or other electronic components such as control ICs may also be soldered onto the circuit pattern 11. When manufacturing white COB light strips, the LED chips are blue chips, and white light is produced by mixing blue chips with yellow phosphors; when manufacturing COB light strips of other colors, other colored chips can be selected.
[0019] Step 3, refer to Figure 3 A shared whole-board dam 31 is fabricated between every two adjacent groups of LED chips 2. Another whole-board dam 31 is fabricated on the outer side of each group of LED chips 2 at the edge of the whole-board circuit board. That is, a whole-board dam 31 is shared between adjacent groups of LED chips 2, and each group of LED chips 2 has exactly one dam 3 on both sides. The dam 3 can be formed by dripping silicone or other adhesives. The whole-board dam 31 can be allowed to cure naturally or accelerated by reflow soldering. The height of the dam is 6 to 7.5 mm, and its height-to-width ratio is 2.5:1 to 3.5:1, with an optimal ratio of 3:1.
[0020] Step 4, refer to Figure 4 The fluorescent colloid 4 is then filled and coated within the entire panel dam 31 to cover the LED light-emitting chip 2. This yields a complete COB light strip. The fluorescent colloid 4 is a mixture of yellow phosphor and colloids such as silicone. The luminescence principle of the fluorescent colloid is as follows: the phosphor in the colloid absorbs some of the blue light emitted by the LED light-emitting chip, exciting yellow light, which mixes with other unabsorbed blue light to form white light. When making COB light strips with other luminous colors, other corresponding colors of light-emitting chips and fluorescent colloids can be combined, or the original color of the light-emitting chip can be used. (Reference) Figure 6 and Figure 7 Once the height of the dam and the interval between the two dams are determined, the emission angle R of the COB light strip is directly proportional to the filling height c of the fluorescent colloid 4. Therefore, reducing the filling height c of the fluorescent colloid 4 results in a COB light strip with a smaller emission angle; increasing the filling height c of the fluorescent colloid 4 results in a COB light strip with a larger emission angle. Because the dams in this invention are relatively high, the adjustable range of the emission angle R is correspondingly large. Specifically, by changing the filling height c of the fluorescent colloid 4, the emission angle of this invention can be adjusted between 15 degrees and 120 degrees.
[0021] Step 5, refer to Figures 4 to 7 The slitting process involves using a die to cut the circuit board 1 along the length of each of the full-board retaining walls 31, forming multiple individual COB light strips 10. This yields a single COB light strip. The width of the full-board retaining wall 31 is divided in half, forming individual retaining walls 32 for each COB light strip. After slitting, the height of each individual retaining wall 32 is the same as the original full-board retaining wall 31, but its width is reduced to half. Specifically, the ratio of the height b to the bottom width a of the individual retaining wall 32 becomes 5:1 to 7:1, with the optimal ratio being 6:1.
[0022] This invention eliminates the need for pre-reserved micro-tangents between two sets of LED chips on the entire circuit board and only requires the fabrication of one dam. This allows for a reduction in the width of the light strip, or, while maintaining the same light strip width, an increase in the dam width to increase the dam height. Furthermore, after the entire COB light strip is fabricated, the shared dam between two adjacent sets of LED chips is cut in half along its length, forming two single dams for each COB light strip. The absolute height and aspect ratio of each dam are higher than existing technologies, and its lower limit for the light emission angle is smaller, enabling COB light strips with a light emission angle of up to 15 degrees. This makes it suitable for applications requiring a small light emission angle and concentrated light, such as wall washer lights or floodlights.
Claims
1. A method for manufacturing a COB light strip for high dams, characterized in that... Includes the following steps: 1) Fabricate multiple sets of COB light strip circuit patterns on the whole board circuit board substrate; 2) Solder a set of LED light-emitting chips on each set of circuit patterns; 3) Fabricate a common whole board barrier between each pair of adjacent sets of LED light-emitting chips, and fabricate a whole board barrier on the outer side of each pair of light-emitting chips at the edge of the whole board circuit board; 4) Cut and decompose the whole board circuit board along the length of the whole board barrier to form multiple single COB light strips.
2. The manufacturing method of a high-dam COB light strip according to claim 1, characterized in that: Between steps 3) and 4), a process of coating fluorescent colloid onto the light-emitting chip is also included.
3. The method for manufacturing a COB light strip for high dams according to claim 2, characterized in that: The height of the fluorescent colloid is lower than the height of the entire dam.
4. The manufacturing method of a high-dam COB light strip according to claim 3, characterized in that: The height-to-width ratio of the whole-panel dam is 2.5:1 to 3.5:
1.
5. The method for manufacturing a COB light strip for high dams according to claim 4, characterized in that: The height to width ratio of the whole-panel dam is 3:
1.
6. The method for manufacturing a COB light strip for high dams according to claim 1, characterized in that: The lower limit of the light emission angle of the COB light strip is 15 degrees.