Lens and blackboard light

Abstract

The application provides a lens and a blackboard lamp, and relates to the technical field of lighting lamps, which comprises a mirror body and two fixed elastic sheets. The mirror body has a transmission surface and a light exit surface which are opposite in a first direction. The two fixed elastic sheets are located on the two sides of the mirror body which are opposite in a second direction. The fixed elastic sheets are used for sliding connection in the mounting grooves of the blackboard lamp mounting support and have first contact surfaces and second contact surfaces which are opposite in the first direction. The first contact surfaces and the second contact surfaces are used for abutting on the two inner wall surfaces of the mounting grooves which are opposite in the first direction, respectively. The fixed elastic sheets can be elastically deformed so that the spacing between the first contact surfaces and the second contact surfaces is reduced to adapt to mounting grooves of different sizes. The size precision requirements of the lens and the mounting groove are reduced. The mounting failure and rework caused by size deviation are reduced, and the assembly efficiency is improved.

Description

Technical Field

[0001] This application belongs to the technical field of lighting fixtures, and more specifically, relates to a lens and a blackboard light. Background Technology

[0002] Blackboard lighting fixtures are essential lighting equipment in educational settings, and their optical performance and installation reliability directly affect the lighting quality of the teaching environment. Currently, mainstream blackboard lights on the market typically use aluminum alloy to create mounting brackets through an extrusion molding process, with the optical lenses fixed in the mounting brackets via sliding grooves.

[0003] However, this connection method requires high dimensional accuracy of the grooves on the lens and mounting bracket to ensure a good fit between the lens and the groove. Strict control of the dimensional tolerances after lens molding is necessary, and the machining tolerances of the mounting bracket grooves must also be extremely small. This results in significant manufacturing difficulties for both the lens and the mounting bracket, a low yield rate, and ultimately, high production costs. Furthermore, in actual use, the dimensions of the grooves on the mounting bracket may become smaller due to structural deformation, machining errors, or other factors. In such cases, the lens may not be able to slide smoothly into the grooves, leading to installation failure and requiring replacement of the mounting bracket. This not only affects installation efficiency but also wastes materials. Utility Model Content

[0004] The purpose of this application is to provide a lens and a blackboard light to solve the problem in the prior art where the mounting slot on the bracket is prone to size errors during lens installation, thus affecting installation efficiency.

[0005] To achieve the above objectives, in a first aspect, this application provides a lens, comprising:

[0006] The mirror body has a transmission surface and a light-emitting surface that are opposite to each other in a first direction;

[0007] At least two fixing springs are located on opposite sides of the mirror body in the second direction, and the fixing springs extend in the third direction, wherein any two of the first direction, the second direction and the third direction are perpendicular to each other;

[0008] The fixing spring is used to slide in the mounting groove of the external structure and has a first contact surface and a second contact surface facing away from each other in a first direction. At least one of the first contact surface and the second contact surface is used to abut against the inner wall surface of the mounting groove in the first direction. The fixing spring can elastically deform relative to the mirror body so that the distance between the first contact surface and the second contact surface in the first direction is reduced.

[0009] In some embodiments of the first aspect, the retaining spring includes:

[0010] A first curved portion is connected to the mirror body, and the protruding surface of the first curved portion forms the first contact surface;

[0011] The second curved portion is connected to the end of the first curved portion facing away from the mirror body. The bending direction of the second curved portion is opposite to that of the first curved portion, and the protruding surface of the second curved portion forms the second contact surface.

[0012] In some embodiments of the first aspect, the first curved portion protrudes toward the transmissive surface, and the second curved portion protrudes away from the transmissive surface.

[0013] In some embodiments of the first aspect, in the first direction, the ratio of the distance between the first contact surface and the second contact surface to the distance between the two inner wall surfaces of the mounting groove is 19:25.

[0014] And / or, in the second direction, the ratio of the width of the fixing spring to the depth of the mounting groove is 7:10.

[0015] In some embodiments of the first aspect, in the third direction, the fixing spring is located at the middle part of the lens body, and the ratio of the length of the fixing spring to the length of the lens body is 7:10.

[0016] In some embodiments of the first aspect, the fixing spring has a hollowed-out groove extending in the third direction.

[0017] In some embodiments of the first aspect, in the third direction, the ratio of the length of the hollowed-out groove to the length of the fixing spring is 4:5;

[0018] And / or, in the second direction, the ratio of the width of the cutout groove to the width of the fixing spring is 3:5.

[0019] In some embodiments of the first aspect, the fixing spring is integrally formed with the mirror body.

[0020] In some embodiments of the first aspect, the mirror body includes:

[0021] The transmissive portion has its central axis parallel to the first direction, and the transmissive surface is located at one end of the transmissive portion;

[0022] A light-emitting section is disposed at one end of the transmission section opposite to the transmission surface, and the light-emitting surface is formed on the side of the light-emitting section opposite to the transmission section; the fixing spring is connected to the two opposite ends of the light-emitting section in the second direction.

[0023] Secondly, this application provides a blackboard lamp, comprising:

[0024] The mounting bracket has two mounting slots facing each other in the second direction;

[0025] As described in the first aspect and any alternative embodiments, each of the fixed spring pieces is slidably connected to the corresponding mounting groove.

[0026] The beneficial effects of the lens and blackboard light provided in this application are as follows: Compared with the prior art, by setting a fixing spring that can generate elastic deformation on the lens body, and by sliding the fixing spring with the mounting groove on the mounting bracket, the lens and the mounting bracket are connected and matched. Moreover, the fixing spring can generate elastic deformation to reduce the distance between the first contact surface and the second contact surface when the size of the mounting groove is small, so as to more easily adapt to mounting grooves of different sizes, reduce the requirements for the dimensional accuracy of the lens and the mounting groove, improve the reliability of the connection between the lens and the mounting bracket, and effectively reduce installation failures and rework caused by dimensional deviations, reduce production costs and improve assembly efficiency. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a schematic diagram of the lens structure in an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the lens structure from another perspective in an embodiment of this application;

[0030] Figure 3 This is a cross-sectional view of the lens in an embodiment of this application;

[0031] Figure 4 for Figure 3 Enlarged view of section A;

[0032] Figure 5 This is a cross-sectional view of the blackboard lamp in an embodiment of this application;

[0033] Figure 6 Examples of embodiments in this application Figure 5 Enlarged view of section B;

[0034] Figure 7 This is a schematic diagram showing the relationship between the fixing spring and the lens body dimensions in an embodiment of this application;

[0035] Figure 8This is a schematic diagram showing the dimensional relationship between the lens fixing spring and the mounting groove in an embodiment of this application.

[0036] The following are the labeling elements in the figure:

[0037] 100-Lens; 110-Lens body; 110a-Transmitting surface; 110b-Light emitting surface; 110c-Total internal reflection surface; 111-Transmitting part; 112-Light emitting part; 1121-Refracting protrusion; 120-Fixing spring; 120a-First contact surface; 120b-Second contact surface; 121-First bending part; 122-Second bending part; 1201-Hollowed groove; 200-Mounting bracket; 201-Mounting slot. Detailed Implementation

[0038] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0039] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0040] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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 this application.

[0041] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] Reference Figures 1-8 This application provides a blackboard light, including a lens 100 and a mounting bracket 200. The lens 100 is fixed on the mounting bracket 200 and is used to focus and project light onto the blackboard area to provide a uniform and suitable lighting effect.

[0043] Reference Figures 1-3 The lens 100 provided in this application embodiment includes a lens body 110 and two fixing springs 120.

[0044] The mirror body 110 has a transmission surface 110a and a light-emitting surface 110b facing away from each other in a first direction. The transmission surface 110a and the light-emitting surface 110b can be curved or planar. The transmission surface 110a is used for light input, while the light-emitting surface 110b is used for light output. Furthermore, the mirror body 110 also has a total internal reflection surface 110c located on its periphery. The total internal reflection surface 110c is used to reflect light towards the light-emitting surface 110b to improve light utilization and light emission effect. Two fixing springs 120 are respectively located on opposite sides of the mirror body 110 in a second direction, and the fixing springs 120 extend along a third direction. Any two of the first direction, the second direction, and the third direction are perpendicular to each other. In this embodiment, the first direction is a vertical direction, and the second direction and the third direction are two mutually perpendicular horizontal directions.

[0045] In this embodiment, the mirror body 110 includes a transmissive portion 111 and a light-emitting portion 112. The central axis of the transmissive portion 111 is parallel to a first direction. A transmissive surface 110a is located at one end of the transmissive portion 111. The light-emitting portion 112 is disposed at one end of the transmissive portion 111 facing away from the transmissive surface 110a. A light-emitting surface 110b is formed on the side of the light-emitting portion 112 facing away from the transmissive portion 111. Two fixing springs 120 can be respectively connected to the two opposite ends of the light-emitting portion 112 in a second direction. The transmissive portion 111 can be a rotary structure around a central axis, with its periphery forming a curved total reflection surface 110c. A groove is formed at one end of its axial direction, and the groove bottom surface forms a curved transmissive surface 110a. The light-emitting part 112 may be a square structure with a width equal to the diameter of the end face of the transmission part 111 facing away from the transmission surface 110a, and the transmission part 111 and the light-emitting part 112 may be integrally formed, with two fixing springs 120 located on opposite sides of the light-emitting part 112.

[0046] Furthermore, the light-emitting surface 110b may also be provided with a plurality of refractive protrusions 1121, which are arc-shaped and are used to further refract the light and guide it to a specific lighting area to improve the light uniformity and lighting effect of the blackboard lamp.

[0047] Reference Figures 4-6The mounting bracket 200 for the blackboard lamp has a mounting chamber for accommodating the lens body 110, and also has two mounting slots 201 facing each other in a second direction. The two mounting slots 201 are located on both sides of the mounting chamber, and the openings of the mounting slots 201 both face the mounting chamber. Two retaining springs 120 on the lens 100 are slidably connected in the two mounting slots 201 to install the lens 100 into the mounting chamber and allow the lens 100 to move along the extension direction of the mounting slots 201, facilitating installation and removal.

[0048] The fixing spring 120 is slidably connected in the mounting groove 201 of the external structure and has a first contact surface 120a and a second contact surface 120b facing away from each other in a first direction. At least one of the first contact surface 120a and the second contact surface 120b is used to abut against two inner wall surfaces facing away from each other in the first direction of the mounting groove 201. The fixing spring 120 is elastically deformable relative to the mirror body 110 so that the distance between the first contact surface 120a and the second contact surface 120b in the first direction is reduced.

[0049] When the size of the mounting groove 201 decreases due to processing errors or external environmental factors, the fixing spring 120 can reduce the distance between the first contact surface 120a and the second contact surface 120b through elastic deformation, so that the fixing spring 120 can slide smoothly into the mounting groove 201. At this time, the rebound force generated by the elastic deformation can ensure that the fixing spring 120 maintains stable contact with the inner wall of the mounting groove 201, preventing the lens 100 from loosening.

[0050] Through the above solution, this application solves the problem of limited precision in the fit between the lens 100 and the lamp body groove in traditional blackboard lamp fixing structures. The elastic deformation capability of the fixing spring 120 can effectively compensate for dimensional deviations caused by material processing tolerances and environmental temperature changes, improving installation reliability. At the same time, it reduces reliance on process precision, minimizing rework and material waste due to dimensional issues. This solution not only simplifies the assembly process but also avoids potential damage to the optical surface of the lens 100, ensuring the stability of optical performance. Therefore, this application achieves efficient and low-cost production of blackboard lamps, improving product quality and production efficiency.

[0051] In some embodiments, the fixing spring 120 includes a first curved portion 121 and a second curved portion 122. The first curved portion 121 is connected to the lens body 110 and its protruding surface forms a first contact surface 120a. The second curved portion 122 is connected to the end of the first curved portion 121 and its bending direction is opposite to that of the first curved portion 121. Its protruding surface forms a second contact surface 120b.

[0052] In this embodiment, the first curved portion 121 is connected to the lens body 110 at the root of the fixing spring 120, and the second curved portion 122 forms a free end. The two curved portions bend in opposite directions, forming a continuous S-shaped curvature structure. When the first curved portion 121 protrudes towards the transmission surface 110a, the second curved portion 122 protrudes away from the transmission surface 110a. For example, in this embodiment, the first curved portion 121 protrudes towards the transmission surface 110a, and the second curved portion 122 protrudes away from the transmission surface 110a.

[0053] Specifically, when the fixing spring 120 is inserted into the mounting groove 201, the free end of the second curved portion 122 first enters the mounting groove 201. Its arc-shaped structure acts as a guide, allowing the second curved portion 122 to slide smoothly into the mounting groove 201 and deform under pressure upon contact with the inner wall of the groove. At this time, the first curved portion 121 undergoes elastic deformation in the same direction under the opposite force. As the fixing spring 120 continues to penetrate deeper into the mounting groove 201, the protruding surface of the first curved portion 121, i.e., the first contact surface 120a, gradually contacts the other inner wall surface of the mounting groove 201 in the first direction and generates pressure. Due to the elastic characteristics of the fixing spring 120, both the first curved portion 121 and the second curved portion 122 undergo corresponding elastic deformation, thereby reducing the distance between the first contact surface 120a and the second contact surface 120b in the first direction to adapt to the actual size of the mounting groove 201.

[0054] The reverse curvature design of the first curved portion 121 and the second curved portion 122 gives the fixing spring 120 a bidirectional elastic support characteristic. The first contact surface 120a and the second contact surface 120b synchronously displace towards each other when subjected to force. During the elastic deformation process, the coordinated deformation of the first curved portion 121 and the second curved portion 122 not only disperses stress concentration, but also maintains the line contact state between the contact surface and the groove wall of the mounting groove 201 through curvature change, avoiding contact failure caused by local deformation. Thus, the fixing spring 120 always provides a uniform elastic preload during compression, ensuring the stable fixation of the lens 100 in the mounting groove 201.

[0055] Reference Figure 7 and Figure 8 In some embodiments, in the first direction, the ratio of the distance between the first contact surface 120a and the second contact surface 120b to the distance between the two inner wall surfaces of the mounting groove 201 is 19:25. In the second direction, the ratio of the width of the fixing spring 120 to the depth of the mounting groove 201 is 7:10.

[0056] The distance between the first contact surface 120a and the second contact surface 120b is set to 76% of the distance between the inner walls of the mounting groove 201. This means the design size of the mounting groove 201 is larger than the size of the fixing spring 120 in its natural state when not subjected to external force. When the size of the mounting groove 201 shrinks without external force, the fixing spring 120 can smoothly slide into the mounting groove 201 without elastic deformation, achieving rapid engagement between the lens 100 and the mounting bracket 200. Furthermore, a certain margin is reserved for potential shrinkage of the mounting groove 201 due to external forces, preventing the size of the mounting groove 201 from shrinking to the elastic compression limit of the fixing spring 120.

[0057] The 70% ratio of the width of the retaining spring 120 to the depth of the mounting groove 201 ensures that, after the retaining spring 120 is embedded in the mounting groove 201, a gap is formed between the edge of the retaining spring 120 facing away from the lens body 110 and the bottom of the mounting groove 201. This gap provides sufficient space for the retaining spring 120 to elastically deform. When the retaining spring 120 undergoes elastic deformation within the mounting groove 201, this gap ensures that the retaining spring 120 will not generate hard friction with the bottom of the mounting groove 201 due to excessive compression, thereby protecting the integrity of the retaining spring 120 and extending its service life. Simultaneously, this gap also allows the retaining spring 120 a certain range of movement within the mounting groove 201, enhancing the flexibility of position adjustment of the lens 100 relative to the mounting bracket 200.

[0058] In some embodiments, the fixing spring 120 is located at the middle part of the lens body 110 in the third direction, and the ratio of the length of the fixing spring 120 to the length of the lens body 110 is 7:10.

[0059] The fixing spring 120 is positioned at the midpoint along the length of the mirror body 110 to ensure symmetrical force distribution on both sides. The length of the fixing spring 120 accounts for 70% of the total length of the mirror body 110, ensuring sufficient contact area to support the mirror body 110 while preventing structural redundancy due to excessive length. This proportion balances the elastic deformation space and structural strength, making it less prone to skew when the spring slides within the mounting groove 201.

[0060] Specifically, the centrally positioned fixing spring 120 ensures that the center of gravity of the mirror body 110 in the third direction coincides with the spring support point, reducing the risk of jamming due to force offset during installation. The length of the fixing spring 120 is designed in a 7:10 ratio with the length of the mirror body 110, forming an effective support section along the total length of the mirror body 110, ensuring that the contact area between the spring and the mounting groove 201 covers the main load-bearing parts of the mirror body 110. When the mirror body 110 is subjected to external force, the fixing spring 120 absorbs dimensional deviations through its own elastic deformation. At the same time, the central position, combined with a specific length ratio, ensures that the deformation on both sides of the fixing spring 120 is uniform, avoiding excessive compression on one side that could lead to structural failure. For example, when the length of the mirror body 110 is 100 mm, the length of the fixing spring 120 is 70 mm. This size provides sufficient elastic travel without increasing the frictional resistance with the sidewall of the mounting groove 201 due to excessive spring length.

[0061] In some embodiments, the fixing spring 120 has a hollowed-out groove 1201 extending in a third direction. The hollowed-out groove 1201 is a hollow structure that passes through the fixing spring 120, used to reduce the weight of the fixing spring 120 and weaken the structural strength of the fixing spring 120 on both sides of the hollowed-out groove 1201, making this part easier to bend and generate elastic deformation. The shape of the hollowed-out groove 1201 can be circular, elliptical, rectangular, or other suitable shapes, and the specific shape selection can be determined according to the overall structure of the spring and the deformation requirements. The location and number of hollowed-out grooves 1201 can be arbitrary. In this embodiment, the hollowed-out groove 1201 is elongated and is opened on the first curved portion 121, and the hollowed-out groove 1201 is located in the middle part of the first curved portion 121, so that the remaining part of the first curved portion 121 on both sides of the hollowed-out groove 1201 has the same length. This design can ensure that the first curved portion 121 can deform evenly when compressed, avoiding structural damage caused by stress concentration.

[0062] Furthermore, in the third direction, the ratio of the length of the hollow groove 1201 to the length of the fixing spring 120 is 4:5; in the second direction, the ratio of the width of the hollow groove 1201 to the width of the fixing spring 120 is 3:5. By limiting the length and width of the hollow groove 1201, the elastic deformation capability and structural strength of the fixing spring 120 can be balanced.

[0063] Specifically, the longitudinal length of the hollowed-out groove 1201 accounts for 80% of the total length of the fixed spring piece 120, creating a continuous elastic deformation area in the third direction. When the fixed spring piece 120 is compressed, the solid portions on both sides of the hollowed-out groove 1201 undergo symmetrical bending, causing the distance between the first contact surface 120a and the second contact surface 120b to decrease uniformly. The transverse width of the hollowed-out groove 1201 accounts for 60% of the width of the fixed spring piece 120, ensuring sufficient material removal to reduce rigidity while retaining 40% of the solid width to maintain structural stability. This dimensional configuration allows the fixed spring piece 120 to maintain linear deformation characteristics in the second direction, avoiding excessive local stress due to an excessively large hollowed-out area. During installation, the presence of the hollowed-out groove 1201 reduces the overall stiffness of the spring piece, allowing for greater elastic deformation under the same external force, thereby effectively compensating for dimensional deviations between the mounting groove 201 and the fixed spring piece 120.

[0064] In some embodiments, the fixing spring 120 and the mirror body 110 are integrally formed. For example, the fixing spring 120 and the mirror body 110 can be formed into a single continuous structure through injection molding or extrusion. Furthermore, the integral molding can be done using polycarbonate or PMMA materials to ensure that there are no stress concentration points between the fixing spring 120 and the mirror body 110 during elastic deformation. The integrally formed structure eliminates the gap at the connection between the fixing spring 120 and the mirror body 110, allowing the elastic deformation of the fixing spring 120 under the pressure of the mounting groove 201 to be evenly distributed throughout the overall structure, avoiding plastic deformation or fracture caused by localized stress concentration in a split structure. Simultaneously, this structure can maintain synchronous thermal expansion of the fixing spring 120 and the mirror body 110 under high-temperature environments, preventing separation of the contact surfaces due to material differences and ensuring the stability of double-sided contact within the mounting groove 201.

[0065] In summary, this application, through the elastic connection between the fixing spring 120 and the mounting groove 201, allows for a certain deviation in the mating dimensions between the fixing spring 120 and the mounting groove 201 during installation. The deformation capability of the fixing spring can automatically compensate for the dimensional differences, avoiding installation jamming or failure caused by dimensional mismatch. Simultaneously, this solution reduces the process requirements for the machining accuracy of the mounting bracket 200 and the forming accuracy of the lens 100, effectively improving production yield and reducing rework costs.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lens, characterized in that, include: The mirror body has a transmission surface and a light-emitting surface that are opposite to each other in a first direction; Two fixing springs are located on opposite sides of the mirror body in the second direction, and the fixing springs extend along the third direction. Any two of the first direction, the second direction, and the third direction are perpendicular to each other. The fixing spring is slidably connected in the mounting groove of the external structure and has a first contact surface and a second contact surface facing away from each other in a first direction. At least one of the first contact surface and the second contact surface is used to abut against the inner wall surface of the mounting groove in the first direction. The fixing spring can elastically deform relative to the mirror body so that the distance between the first contact surface and the second contact surface in the first direction is reduced.

2. The lens according to claim 1, characterized in that, The fixing spring includes: A first curved portion is connected to the mirror body, and the protruding surface of the first curved portion forms the first contact surface; The second curved portion is connected to the end of the first curved portion facing away from the mirror body. The bending direction of the second curved portion is opposite to that of the first curved portion, and the protruding surface of the second curved portion forms the second contact surface.

3. The lens according to claim 2, characterized in that, The first curved portion protrudes toward the transmissive surface, and the second curved portion protrudes away from the transmissive surface.

4. The lens according to claim 1, characterized in that, In the first direction, the ratio of the distance between the first contact surface and the second contact surface to the distance between the two inner wall surfaces of the mounting groove is 19:25; And / or, in the second direction, the ratio of the width of the fixing spring to the depth of the mounting groove is 7:

10.

5. The lens according to claim 1, characterized in that, In the third direction, the fixing spring is located in the middle part of the lens body, and the ratio of the length of the fixing spring to the length of the lens body is 7:

10.

6. The lens according to claim 1, characterized in that, The fixing spring has a hollowed-out groove extending along the third direction.

7. The lens according to claim 6, characterized in that, In the third direction, the ratio of the length of the hollowed-out groove to the length of the fixing spring is 4:5; And / or, in the second direction, the ratio of the width of the cutout groove to the width of the fixing spring is 3:

5.

8. The lens according to any one of claims 1-7, characterized in that, The fixing spring is integrally formed with the mirror body.

9. The lens according to any one of claims 1-7, characterized in that, The mirror body includes: The transmissive portion has its central axis parallel to the first direction, and the transmissive surface is located at one end of the transmissive portion; A light-emitting section is disposed at one end of the transmission section opposite to the transmission surface, and the light-emitting surface is formed on the side of the light-emitting section opposite to the transmission section; the fixing spring is connected to the two opposite ends of the light-emitting section in the second direction.

10. A blackboard lamp, characterized in that, include: The mounting bracket has two mounting slots facing each other in the second direction; The lens as described in any one of claims 1-9, wherein the fixing spring is slidably connected to the corresponding mounting groove.

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