Lamp panel and phototherapy equipment

Abstract

The utility model relates to the technical field of beauty physiotherapy equipment, and provides a lamp panel and phototherapy equipment, the lamp panel comprises a circuit board, a lamp bead and a metal grid current limiting structure, and the lamp bead is electrically connected to the circuit board; the metal grid current limiting structure is used for limiting current flowing through the lamp bead, the metal grid current limiting structure is arranged on the circuit board, and the metal grid current limiting structure is connected with the lamp bead in series. The metal grid current limiting structure is used for replacing a traditional resistor, effective current limiting can be carried out on the lamp beads, the heat dissipation performance can be improved, meanwhile, the circuit layout of the lamp panel is simplified, and therefore the overall reliability and attractiveness are improved.

Description

Technical Field

[0001] This application relates to the field of beauty and physiotherapy equipment technology, and in particular provides a lamp panel and a phototherapy device. Background Technology

[0002] Currently, with the development of technology and the improvement of living standards, more and more users are using phototherapy equipment for beauty treatments. Existing phototherapy equipment has a lamp panel inside, through which lamp beads on the lamp panel emit light of different colors, thereby achieving the effect of beauty and skin care.

[0003] However, in the existing LED circuit boards, traditional resistors are commonly used to limit the current of the LEDs, which results in a messy circuit layout for the entire LED board, which can easily affect performance and overall appearance, and has poor reliability. Utility Model Content

[0004] The purpose of this application is to provide a lamp board and phototherapy device, which aims to solve the problems of messy circuits, poor performance and appearance, and poor reliability caused by the use of resistors in existing lamp boards.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] This application provides a light panel, including:

[0007] Circuit board;

[0008] LED beads, which are electrically connected to the circuit board;

[0009] A metal mesh current limiting structure is used to limit the current flowing through the LED. The metal mesh current limiting structure is disposed on the circuit board and is connected in series with the LED.

[0010] The lamp board provided in this application uses a metal mesh current-limiting structure instead of a traditional resistor, which can not only effectively limit the current of the lamp beads, but also improve heat dissipation performance and simplify the circuit layout of the lamp board, thereby improving the overall reliability and aesthetics.

[0011] Optionally, the number of LED beads is multiple, and the multiple LED beads are arranged in multiple columns. The LED beads in each column are connected in parallel, and the LED beads in each column are connected in series sequentially through the metal mesh current limiting structure.

[0012] Optionally, the circuit board is further provided with a first connecting line connecting one end of each column of LED beads and a second connecting line connecting the other end of each column of LED beads.

[0013] Optionally, the metal mesh current limiting structure includes a plurality of first conductive lines and a plurality of second conductive lines. The plurality of first conductive lines are arranged at equal intervals along the length direction of the metal mesh current limiting structure, and the plurality of second conductive lines are arranged at equal intervals along the length direction of the metal mesh current limiting structure. The first conductive lines and the second conductive lines intersect with the length direction of the metal mesh current limiting structure.

[0014] Each of the first conductive lines is connected to at least two of the second conductive lines, and each of the second conductive lines is connected to at least two of the first conductive lines.

[0015] Optionally, the number of second conductive wires connected to each of the first conductive wires is 2-6, and the number of first conductive wires connected to each of the second conductive wires is 2-6.

[0016] Optionally, the angle between the first conductive line and the length direction of the metal mesh current limiting structure is in the range of 30°-60°, the angle between the second conductive line and the length direction of the metal mesh current limiting structure is in the range of 30°-60°, and the angle between the first conductive line and the second conductive line is in the range of 60°-90°.

[0017] Optionally, the metal mesh current limiting structure is provided with a welding pad, which is welded to the electrode of the lamp bead, and the welding pad is connected to at least two adjacent first conductive lines and at least two second conductive lines.

[0018] Optionally, the circuit board is provided with an insulating layer that covers the metal mesh current limiting structure, and the insulating layer has an opening for the solder pads to be exposed.

[0019] Optionally, the lamp bead is an LED lamp bead; and / or, the circuit board is a flexible insulating board or a rigid insulating board; and / or, the metal mesh current limiting structure is a metal layer plated on the circuit board.

[0020] This application also provides a phototherapy device, including: the aforementioned lamp panel.

[0021] The phototherapy device provided in this application uses a metal mesh current-limiting structure on the lamp board instead of a traditional resistor. This not only effectively limits the current of the lamp beads but also improves heat dissipation performance and simplifies the circuit layout of the lamp board, thereby improving the overall reliability and aesthetics. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is one of the structural schematic diagrams of the lamp panel provided in the embodiments of this application;

[0024] Figure 2 This is a second schematic diagram of the structure of the lamp panel provided in the embodiments of this application;

[0025] Figure 3 for Figure 2 A magnified view of part A;

[0026] Figure 4 This is a schematic diagram of the structure of the LED circuit provided in the embodiments of this application;

[0027] Figure 5 This is an assembly diagram of the metal mesh current-limiting structure provided in the embodiments of this application;

[0028] Figure 6 This is one of the structural schematic diagrams of the phototherapy device provided in the embodiments of this application;

[0029] Figure 7 This is a second schematic diagram of the phototherapy device provided in the embodiments of this application.

[0030] The following are the labeling elements in the figure:

[0031] 1. Circuit board; 2. LED beads; 3. Metal mesh current limiting structure; 4. Power supply terminal; 5. Grounding terminal;

[0032] 6. LED circuit; 7. First connecting wire; 8. Second connecting wire; 9. First conductive wire;

[0033] 10. Second conductive wire; 11. Welding pad; 12. First metal mesh current-limiting structure;

[0034] 13. Second metal mesh current-limiting structure; 14. Insulation layer;

[0035] 15. Substrate; 16. Transmitting sheet; 17. Shell; 18. Transmitting plate. Detailed Implementation

[0036] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0037] In the description of the embodiments of this application, it should be understood that the terms "length", "width", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] In the embodiments of this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0040] According to an embodiment of the first aspect of this application, referring to... Figure 1 As shown, this application provides a lamp board, including a circuit board 1, an LED chip 2, and a metal mesh current limiting structure 3. The LED chip 2 is electrically connected to the circuit board 1; the metal mesh current limiting structure 3 is used to limit the current flowing through the LED chip 2, and is disposed on the circuit board 1 and connected in series with the LED chip 2.

[0041] In this embodiment of the application, circuit board 1 serves as the substrate of the entire lamp board, supporting components such as lamp beads 2 and metal mesh current-limiting structure 3. In actual design, circuit board 1 has good insulation and heat resistance to ensure that short circuits or other malfunctions will not occur during operation.

[0042] Lamp bead 2 is the core component for light emission. Lamp bead 2 can be an LED lamp bead, which emits different wavelengths to produce different colors of light for various beauty and therapeutic purposes.

[0043] The metal mesh current limiting structure 3 is a unique structural design used to replace traditional resistors. The metal mesh current limiting structure 3 can be made of materials with good conductivity, such as copper or aluminum, and is formed into a specific mesh shape through precision machining.

[0044] The metal mesh current-limiting structure 3 limits the current flowing through the LED bead 2 by utilizing the resistive properties of the metal material. The resistance value of the metal mesh current-limiting structure 3 depends on factors such as the type, thickness, width, and length of the metal material. For example, thinner metal wires or smaller mesh apertures provide higher resistance, thereby limiting the current.

[0045] Furthermore, the metal mesh current-limiting structure 3, due to its large surface area, can dissipate heat more effectively, which helps to keep the operating temperature of the LED bead 2 within a safe range and reduces the risk of damage to the LED bead 2 due to overheating.

[0046] Furthermore, using the metal mesh current limiting structure 3 instead of a separate resistor simplifies circuit design and makes wiring more concise and aesthetically pleasing. Since the metal mesh current limiting structure 3 is directly integrated onto the circuit board 1, it also saves space, making the entire lamp panel more compact and easier to install and maintain.

[0047] Therefore, the lamp board provided in this application embodiment, by using the metal mesh current limiting structure 3 to replace the traditional resistor, can not only effectively limit the current of the lamp beads 2, but also improve the heat dissipation performance, and simplify the circuit layout of the lamp board, thereby improving the overall reliability and aesthetics.

[0048] According to one embodiment of this application, refer to Figure 1 and Figure 2 As shown, the circuit board 1 has a power terminal 4 and a ground terminal 5. The power terminal 4 is used to connect to the power supply, and the ground terminal 5 is used to ground. The LED bead 2 and the metal mesh current limiting structure 3 are connected in series between the power terminal 4 and the ground terminal 5.

[0049] According to one embodiment of this application, refer to Figure 2 As shown, there are multiple LED beads 2, which are arranged in multiple columns. The LED beads 2 in each column are connected in parallel, and the LED beads 2 in each column are connected in series through a metal mesh current limiting structure 3.

[0050] In this embodiment of the application, the LED beads 2 are arranged in multiple columns to form a multi-column LED bead circuit 6. The LED beads 2 in each column of the LED bead circuit 6 are connected in parallel with each other, so that even if a problem occurs in one column of LED beads 2, it will not affect the LED beads 2 in other columns.

[0051] In each row of LED circuits 6, the metal mesh current limiting structure 3 is connected in series with the LED 2. This arrangement allows the LED 2 in each row to be current-limited through its corresponding metal mesh current limiting structure 3, protecting each row of LED 2. Furthermore, the metal mesh current limiting structures 3 in each row do not interfere with each other, optimizing the wiring layout of the LED board and thus facilitating maintenance.

[0052] Understandably, since the LEDs 2 are connected in parallel in each column, the LEDs 2 in each column share the same power supply voltage. When current flows through the circuit, it is evenly distributed in each column, which means that even if there is a problem with one column of LEDs 2 or the metal mesh current limiting structure 3, the other columns can still work normally, improving the overall reliability of the LED board.

[0053] Furthermore, the function of the metal mesh current-limiting structure 3 is to limit the current passing through the LED beads 2 in each column. By selecting appropriate metal mesh size and material, the current of the LED beads 2 in each column can be precisely controlled, thereby ensuring that all LED beads 2 can operate at a safe operating current.

[0054] Furthermore, the metal mesh current-limiting structure 3 not only has a current-limiting function, but also serves as part of the heat dissipation path. Through the mesh heat dissipation effect of the metal mesh current-limiting structure 3, the operating temperature of the LED chip 2 can be effectively reduced, thereby improving the lifespan and stability of the LED chip 2.

[0055] Therefore, the lamp board design provided in this application embodiment can increase the phototherapy coverage area by using multiple rows of distributed lamp beads 2 and a metal mesh current limiting structure 3, thereby improving the phototherapy effect. It also achieves effective current control and good heat dissipation, while simplifying the lamp board layout and improving the reliability and aesthetics of the product.

[0056] According to one embodiment of this application, refer to Figure 2 As shown, the circuit board 1 is also provided with a first connecting line 7 connecting one end of each row of LED beads 2 and a second connecting line 8 connecting the other end of each row of LED beads 2.

[0057] In this embodiment of the application, the first connecting line 7 connects to one end (e.g., the positive terminal) of each row of LED beads 2, connecting all rows of LED beads 2 together to form a unified input terminal, which is connected to the power supply terminal 4. The second connecting line 8 connects to the other end (e.g., the negative terminal) of each row of LED beads 2, similarly connecting all rows of LED beads 2 together to form a unified output terminal, which is connected to the ground terminal 5.

[0058] This embodiment of the application, by setting the first connecting line 7 and the second connecting line 8, can greatly simplify the wiring layout on the circuit board 1. It eliminates the need to set up complex wiring paths for each row of LED beads 2, but instead connects the two ends of all LED beads 2 uniformly through these two sets of connecting lines. This design makes the wiring on the circuit board 1 clearer and more orderly, improving the reliability, ease of maintenance, and aesthetics of the circuit board 1.

[0059] According to one embodiment of this application, refer to Figure 3 As shown, the metal mesh current limiting structure 3 includes a plurality of first conductive lines 9 and a plurality of second conductive lines 10. The plurality of first conductive lines 9 are arranged at equal intervals along the length direction Z of the metal mesh current limiting structure 3, and the plurality of second conductive lines 10 are arranged at equal intervals along the length direction Z of the metal mesh current limiting structure 3. The first conductive lines 9 and the second conductive lines 10 intersect with the length direction Z of the metal mesh current limiting structure 3. Each first conductive line 9 is connected to at least two second conductive lines 10, and each second conductive line 10 is connected to at least two first conductive lines 9.

[0060] In this embodiment of the application, the first conductive lines 9 are arranged at equal intervals along the length direction Z of the metal mesh current limiting structure 3. These conductive lines constitute one of the basic frameworks of the metal mesh current limiting structure 3.

[0061] The second conductive wire 10 is also arranged at equal intervals along the length Z of the metal mesh current limiting structure 3 and intersects with the first conductive wire 9. These conductive wires constitute another basic framework of the metal mesh current limiting structure 3.

[0062] Each first conductive wire 9 is connected to at least two second conductive wires 10, and each second conductive wire 10 is also connected to at least two first conductive wires 9. This interlaced connection forms a stable metal mesh structure.

[0063] The metal mesh current-limiting structure 3 limits the current through its own resistance characteristics. When current passes through the metal mesh, the metal mesh has a certain resistance, which prevents the current from increasing indefinitely, thus protecting the LED 2 from damage due to excessive current.

[0064] Since the metal mesh is composed of multiple first conductive lines 9 and second conductive lines 10, the current is dispersed throughout the entire mesh when it passes through the metal mesh. This helps to make the current distribution among the LED beads 2 more uniform, ensuring that each LED bead 2 can receive the appropriate current.

[0065] The metal mesh not only has good electrical conductivity but also good thermal conductivity. The metal mesh helps dissipate heat from the LED chip 2, improving heat dissipation efficiency and thus extending the lifespan of the LED chip 2.

[0066] This metal mesh design helps simplify the routing layout on board 1. By using the metal mesh current-limiting structure 3 instead of traditional resistors, the number of components on board 1 can be reduced, resulting in a cleaner layout.

[0067] Therefore, the lamp board design using the metal mesh current-limiting structure 3 in this embodiment not only achieves effective current control but also improves heat dissipation performance and overall reliability through its structural characteristics. Simultaneously, this design simplifies the wiring layout on the circuit board 1, making the overall design of the lamp board more concise and aesthetically pleasing.

[0068] According to one embodiment of this application, the number of second conductive lines 10 connected to each first conductive line 9 is 2-6, and the number of first conductive lines 9 connected to each second conductive line 10 is 2-6.

[0069] In this embodiment of the application, the number of first conductive lines 9 matches the number of second conductive lines 10, forming a mesh structure. Each first conductive line 9 is connected to 2 to 6 second conductive lines 10. Similarly, each second conductive line 10 is also connected to 2 to 6 first conductive lines 9. This design ensures the stability and mechanical strength of the metal mesh current-limiting structure 3.

[0070] This application embodiment can control the distribution of current in the metal mesh current limiting structure 3 by adjusting the number and connection method of the first conductive wire 9 and the second conductive wire 10, thereby ensuring that each lamp bead 2 can obtain a suitable current and achieve a more uniform light emission effect.

[0071] According to one embodiment of this application, refer to Figure 3 As shown, the angle e between the first conductive line 9 and the length direction Z of the metal mesh current limiting structure 3 is in the range of 30°-60°, the angle f between the second conductive line 10 and the length direction Z of the metal mesh current limiting structure 3 is in the range of 30°-60°, and the angle g between the first conductive line 9 and the second conductive line 10 is in the range of 60°-90°.

[0072] In this embodiment of the application, the angle between the first conductive line 9 and the length direction Z of the metal mesh current-limiting structure 3 ranges from 30° to 60°. This means that the first conductive line 9 has a certain tilt angle relative to the length direction Z, and this tilt angle helps to optimize the current distribution in the mesh.

[0073] The angle between the second conductive wire 10 and the length direction Z of the metal mesh current-limiting structure 3 is also in the range of 30°-60°. Similar to the first conductive wire 9, the second conductive wire 10 also has a certain tilt angle, which helps to form a stable mesh structure.

[0074] The angle between the first conductive line 9 and the second conductive line 10 ranges from 60° to 90°. This design ensures the stability and structural strength of the metal mesh current-limiting structure 3.

[0075] This application embodiment can optimize the current distribution in the metal mesh current limiting structure 3 by controlling the angle of the first conductive line 9 and the second conductive line 10, so as to ensure that the current distribution among the lamp beads 2 is more uniform and achieve a more uniform light emission effect.

[0076] According to one embodiment of this application, refer to Figure 4 As shown, the metal mesh current limiting structure 3 is provided with a welding disk 11, which is welded to the electrode of the lamp bead 2, and the welding disk 11 is connected to at least two adjacent first conductive lines 9 and at least two second conductive lines 10.

[0077] In this embodiment of the application, by connecting the solder pad 11 to at least two first conductive lines 9 and at least two second conductive lines 10, a more uniform current distribution among the LED beads 2 can be ensured. This design helps to improve the light emission consistency of the LED beads 2.

[0078] The welding pad 11, connected to the metal mesh current-limiting structure 3, helps dissipate heat from the LED chip 2. The metal mesh current-limiting structure 3 not only limits the current of the LED chip 2, but also acts as a heat dissipation structure to help the LED chip 2 dissipate heat, thereby improving the overall heat dissipation efficiency of the LED board.

[0079] In this embodiment of the application, by setting a soldering pad 11 on the metal mesh current limiting structure 3, the wiring layout on the circuit board 1 can be further simplified, making the wiring of the circuit board 1 more concise and orderly.

[0080] In one embodiment, refer to Figure 4 and Figure 5 As shown, the LED circuit 6 includes two identical metal mesh current limiting structures, namely a first metal mesh current limiting structure 12 and a second metal mesh current limiting structure 13. One end of the first metal mesh current limiting structure 12 is connected to the power supply terminal 4, and the other end is connected to the positive terminal of the LED 2 through the soldering pad 11. One end of the second metal mesh current limiting structure 13 is connected to the negative terminal of the LED 2 through the soldering pad 11, and the other end is connected to the ground terminal 5.

[0081] The total resistance of the two metal mesh current-limiting structures in this LED circuit 6 can be:

[0082] R = K × ρ × L / (a ​​× c);

[0083] L = L1 + L2;

[0084] Where R is the total resistance of the two metal mesh current-limiting structures; K is the mesh duty cycle (i.e., the ratio of the total area of ​​all meshes to the total area of ​​the two metal mesh current-limiting structures); ρ is the metal resistivity; L is the total length of the two metal mesh current-limiting structures; L1 is the length of the first metal mesh current-limiting structure; L2 is the length of the second metal mesh current-limiting structure; a is the width of the metal mesh current-limiting structure; and c is the thickness of the metal mesh current-limiting structure.

[0085] According to one embodiment of this application, refer to Figure 5 As shown, the circuit board 1 has an insulating layer 14, which covers the metal mesh current limiting structure 3, and the insulating layer 14 has an opening for the soldering pad 11 to be exposed.

[0086] In this embodiment of the application, the presence of the insulating layer 14 ensures sufficient electrical isolation between the metal mesh current limiting structure 3 and other conductive components on the circuit board 1, avoiding the risk of short circuits and improving safety.

[0087] Furthermore, by creating openings in the insulating layer 14, the solder pad 11 is exposed, allowing the electrodes of the LED bead 2 to be easily soldered to the solder pad 11. This design simplifies the installation process of the LED bead 2 and ensures a secure electrical connection.

[0088] The insulating layer 14 can be made of a material with high insulating properties, such as polyimide film, polyester film or other high-performance polymers.

[0089] According to one embodiment of this application, the lamp bead 2 is an LED lamp bead.

[0090] By using LED beads as the light source and combining them with a metal mesh current-limiting structure 3 and an insulating layer 14, this application enables the light panel to not only provide efficient beauty and skincare effects, but also ensure a long service life and excellent performance stability.

[0091] According to one embodiment of this application, circuit board 1 is a flexible insulating board or a rigid insulating board.

[0092] This design allows the lamp panel to be used in various phototherapy devices. For example, when circuit board 1 is a flexible insulating board, the lamp panel with circuit board 1 can be used in applications such as... Figure 6 In the phototherapy face mask shown. When circuit board 1 is a rigid insulating board, the lamp board having circuit board 1 can be applied to, for example... Figure 7 The phototherapy device shown.

[0093] According to one embodiment of this application, the metal mesh current limiting structure 3 is a metal layer plated on the circuit board 1.

[0094] In this embodiment of the application, the metal mesh current limiting structure 3 can be deposited on the circuit board 1 by vacuum sputtering or electroplating, so that the metal mesh current limiting structure 3 is tightly bonded to the circuit board 1, reducing the need for additional connectors and making the layout of the circuit board 1 simpler. Furthermore, forming the metal mesh current limiting structure 3 by plating reduces connection points, lowers the failure rate, and improves the stability and overall reliability of the structure.

[0095] Understandably, traditional resistors typically occupy a large volume, especially in high-power applications, which limits the miniaturization design of phototherapy devices.

[0096] The layered metal mesh flow-limiting structure 3 used in this application can significantly reduce the space occupied, allowing the phototherapy device to have more space for the installation of other structures, improving the space utilization of the phototherapy device, which is conducive to achieving a more compact design, reducing the overall size of the device, and making the phototherapy device lighter and more portable.

[0097] According to an embodiment of the second aspect of this application, this application also provides a phototherapy device, including the lamp panel described in the above embodiment.

[0098] This application does not impose any specific restrictions on the type of phototherapy device. For example, the phototherapy device can be... Figure 6 The phototherapy face mask shown includes a substrate 15 and a light plate. The back side of the substrate 15 can be made of a light-transmitting sheet 16, and the light plate can be a flexible light plate. The light plate is located inside the substrate 15, and the light emitted by the light plate is transmitted through the light-transmitting sheet 16 to perform phototherapy skin care on the face.

[0099] Of course, phototherapy equipment can also provide... Figure 7 The phototherapy device shown includes a housing 17 and a light plate. A light-transmitting plate 18 is provided on the front side of the housing 17. The light plate is located in the housing 17. The light emitted by the light plate is transmitted through the light-transmitting plate 18, thereby performing phototherapy on the body parts.

[0100] The phototherapy device provided in this application includes the lamp board of the above embodiments, and therefore has all the technical effects of the lamp board of the above embodiments, which will not be repeated here.

[0101] The above are merely preferred embodiments of this application and are not intended to limit the embodiments of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A light panel, characterized in that, include: Circuit board; LED beads, which are electrically connected to the circuit board; A metal mesh current limiting structure is used to limit the current flowing through the LED. The metal mesh current limiting structure is disposed on the circuit board and is connected in series with the LED.

2. The lamp panel according to claim 1, characterized in that, The number of LED beads is multiple, and the multiple LED beads are arranged in multiple columns. The LED beads in each column are connected in parallel, and the LED beads in each column are connected in series sequentially through the metal mesh current limiting structure.

3. The lamp panel according to claim 2, characterized in that, The circuit board is also provided with a first connecting line connecting one end of each row of LED beads and a second connecting line connecting the other end of each row of LED beads.

4. The lamp panel according to any one of claims 1 to 3, characterized in that, The metal mesh current limiting structure includes a plurality of first conductive lines and a plurality of second conductive lines. The plurality of first conductive lines are arranged at equal intervals along the length direction of the metal mesh current limiting structure, and the plurality of second conductive lines are arranged at equal intervals along the length direction of the metal mesh current limiting structure. The first conductive lines and the second conductive lines intersect with the length direction of the metal mesh current limiting structure. Each of the first conductive lines is connected to at least two of the second conductive lines, and each of the second conductive lines is connected to at least two of the first conductive lines.

5. The lamp panel according to claim 4, characterized in that, The number of second conductive wires connected to each of the first conductive wires is 2-6, and the number of first conductive wires connected to each of the second conductive wires is 2-6.

6. The lamp panel according to claim 4, characterized in that, The angle between the first conductive line and the length direction of the metal mesh current limiting structure is in the range of 30°-60°, the angle between the second conductive line and the length direction of the metal mesh current limiting structure is in the range of 30°-60°, and the angle between the first conductive line and the second conductive line is in the range of 60°-90°.

7. The lamp panel according to claim 4, characterized in that, The metal mesh current limiting structure is provided with a welding pad, which is welded to the electrode of the lamp bead, and the welding pad is connected to at least two adjacent first conductive lines and at least two second conductive lines.

8. The lamp panel according to claim 7, characterized in that, The circuit board has an insulating layer that covers the metal mesh current limiting structure, and the insulating layer has an opening for the solder pads to be exposed.

9. The lamp panel according to any one of claims 1 to 3, characterized in that, The lamp bead is an LED lamp bead; and / or, the circuit board is a flexible insulating board or a rigid insulating board; and / or, the metal mesh current limiting structure is a metal layer plated on the circuit board.

10. A phototherapy device, characterized in that, include: The lamp panel according to any one of claims 1 to 9.

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