Lens and blackboard lamp

Abstract

The invention provides a lens and a blackboard lamp, and relates to the technical field of lighting lamps, the lens comprises a lens body and two fixing elastic pieces, the lens body is provided with a transmission face and a light emitting face which are back to back in the first direction, and the two fixing elastic pieces are located on the two back-to-back sides of the lens body in the second direction correspondingly; the fixing elastic piece is used for being connected into a mounting groove of a blackboard lamp mounting support in a sliding mode and provided with a first contact face and a second contact face which are back to back in the first direction, the first contact face and the second contact face are used for abutting against the two inner wall faces, back to back in the first direction, of the mounting groove correspondingly, and the fixing elastic piece can elastically deform. Therefore, the distance between the first contact surface and the second contact surface is reduced so as to adapt to the mounting grooves of different sizes, the requirements on the size precision of the lens and the mounting grooves are reduced, the conditions of mounting failure and reworking caused by size deviation are reduced, and the assembly efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of lighting fixtures, and more specifically, relates to a lens and a blackboard lamp. Background Art

[0002] Blackboard lighting fixtures are crucial lighting equipment in educational settings. Their optical performance and installation reliability directly impact the quality of illumination in teaching environments. Currently, mainstream blackboard lighting fixtures on the market typically utilize an aluminum alloy extrusion process to create a mounting bracket, with the optical lens secured within the bracket via a sliding groove.

[0003] However, this connection method places high demands on the dimensional accuracy of the lens and the mounting bracket groove to ensure proper fit between the lens and the groove. The dimensional tolerance of the lens after molding must be strictly controlled, and the machining tolerance range of the mounting bracket groove must also be extremely small. This results in greater difficulty in manufacturing the lens and mounting bracket, low production yields, and ultimately high production costs. Furthermore, in actual use, the size of the mounting bracket groove may decrease due to structural deformation, machining errors, and other factors. In this case, the lens cannot slide smoothly into the mounting bracket groove, resulting in installation failure and the need to replace the mounting bracket. This not only affects installation efficiency but also results in material waste. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a lens and a blackboard lamp to solve the problem in the prior art that when the lens is installed, the mounting groove on the bracket is prone to dimensional errors, thereby affecting the installation efficiency.

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

[0006] A mirror body having a transmission surface and a light emitting surface facing each other in a first direction;

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

[0008] In which, the fixed spring piece is used to be slidably connected in the mounting groove of the external structure, and has a first contact surface and a second contact surface opposite to each other in the 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, and the fixed spring piece can be elastically deformed 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 fixing spring includes:

[0010] a first curved portion connected to the mirror body, wherein a convex surface of the first curved portion forms the first contact surface;

[0011] The second curved portion is connected to an 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 convex 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 transmission surface, and the second curved portion protrudes away from the transmission surface.

[0013] In some embodiments of the first aspect, in the first direction, a ratio of a distance between the first contact surface and the second contact surface to a distance between 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 in the middle of the mirror body, and the ratio of the length of the fixing spring to the length of the mirror body is 7:10.

[0016] In some embodiments of the first aspect, the fixing elastic piece is provided with a hollow groove extending along the third direction.

[0017] In some embodiments of the first aspect, in the third direction, a ratio of the length of the hollow 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 hollow groove to the width of the fixing elastic piece 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 comprises:

[0021] a transmission portion, the central axis of which is parallel to the first direction, and the transmission surface is located at one end of the transmission portion;

[0022] The light emitting portion is arranged at one end of the transmission portion facing away from the transmission surface, and the side of the light emitting portion facing away from the transmission portion forms the light emitting surface; the fixing elastic piece is connected to the two opposite ends of the light emitting portion in the second direction.

[0023] In a second aspect, the present application provides a blackboard lamp, comprising:

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

[0025] As described in the first aspect and any optional embodiment thereof, each of the fixing springs is slidably connected to the corresponding mounting groove.

[0026] The beneficial effects of the lens and blackboard lamp provided by the present application are as follows: compared with the prior art, a fixed spring piece capable of generating elastic deformation is provided on the lens body, and the fixed spring piece is slidably connected to the mounting groove on the mounting bracket to achieve the connection and coordination between the lens and the mounting bracket, and the fixed spring piece can generate elastic deformation when the size of the mounting groove is small to reduce the distance between the first contact surface and the second contact surface, 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, thereby reducing production costs and improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

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

[0029] Figure 2 This is a schematic structural diagram of the lens in another viewing angle in an embodiment of the present application;

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

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

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

[0033] Figure 6 In the embodiment of this application Figure 5 Enlarged view of part B;

[0034] Figure 7 Schematic diagram of the relationship between the size of the fixing spring piece and the lens body of the embodiment of the present application;

[0035] Figure 8Schematic diagram of the relationship between the size of the fixing spring piece and the mounting groove of the lens in the embodiment of the present application.

[0036] Among them, the reference numerals in the figures are:

[0037] 100-lens; 110-mirror body; 110a-transmission surface; 110b-light-emitting surface; 110c-total reflection surface; 111-transmission part; 112-light-emitting part; 1121-refractive protrusion; 120-fixing spring; 120a-first contact surface; 120b-second contact surface; 121-first bending part; 122-second bending part; 1201-hollow groove; 200-mounting bracket; 201-mounting groove. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0039] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0040] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0042] Reference Figures 1-8 The embodiment of the present application provides a blackboard lamp, including a lens 100 and a mounting bracket 200. The lens 100 is fixed on the mounting bracket 200 and is used to converge and project light onto the blackboard area to provide a uniform lighting effect with appropriate brightness.

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

[0044] Among them, the mirror body 110 has a transmission surface 110a and a light-emitting surface 110b that are opposite to each other in the first direction. The transmission surface 110a and the light-emitting surface 110b can be curved surfaces or flat surfaces. The transmission surface 110a is used for light input, while the light-emitting surface 110b is used for light output. In addition, the mirror body 110 also has a total reflection surface 110c located on its circumference. The total reflection surface 110c is used to reflect light toward the light-emitting surface 110b to improve the utilization rate of light and the light-emitting effect. The two fixed springs 120 are respectively located on two sides of the mirror body 110 that are opposite to each other in the second direction, and the fixed springs 120 extend along the 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 the 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. The transmissive surface 110a is located at one end of the transmissive portion 111. The light-emitting portion 112 is disposed at the end of the transmissive portion 111 facing away from the transmissive surface 110a. The 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 opposite ends of the light-emitting portion 112 in the second direction. The transmissive portion 111 can be a rotating structure revolving about a central axis, with its circumference forming a curved total reflection surface 110c. One axial end of the transmissive portion 111 defines a groove, which, together with the bottom surface of the groove, forms the curved transmissive surface 110a. The light emitting portion 112 may be a square structure with a width equal to the diameter of the end surface of the transmitting portion 111 away from the transmitting surface 110 a . The transmitting portion 111 and the light emitting portion 112 may be integrally formed. The two fixing springs 120 are respectively located on opposite sides of the light emitting portion 112 .

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

[0047] Reference Figure 4-Figure 6The blackboard lamp's mounting bracket 200 includes a mounting chamber for accommodating the lens body 110 and two mounting slots 201 facing each other in the second direction. The two mounting slots 201 are located on either side of the mounting chamber, with both openings facing toward the chamber. The two retaining springs 120 on the lens 100 are slidably connected to the two mounting slots 201 to secure the lens 100 within the mounting chamber and allow movement along the extending direction of the mounting slots 201, facilitating installation and removal.

[0048] The fixed spring piece 120 is used to be slidably connected in the mounting groove 201 of the external structure, and has a first contact surface 120a and a second contact surface 120b opposite to each other in the 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 of the mounting groove 201 opposite to each other in the first direction, and the fixed spring piece 120 can be elastically deformed 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 becomes smaller due to processing errors or external environmental factors, the fixing spring piece 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 piece 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 piece 120 maintains stable contact with the inner wall of the mounting groove 201, preventing the lens 100 from loosening.

[0050] Through the above-mentioned solution, the present application solves the problem of limited precision in the fit between the lens 100 and the groove of the lamp body in the traditional blackboard lamp fixing structure. The elastic deformation ability of the fixed spring 120 can effectively compensate for dimensional deviations caused by material processing tolerances and changes in ambient temperature, thereby improving installation reliability. At the same time, it reduces dependence on process accuracy, and reduces rework and material waste caused by 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. As a result, the present application achieves efficient and low-cost production of blackboard lamps, improving product quality and production efficiency.

[0051] In some embodiments, the fixing spring piece 120 includes a first curved portion 121 and a second curved portion 122. The first curved portion 121 is connected to the mirror body 110 and its convex 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 convex surface forms a second contact surface 120b.

[0052] The connection between the first curved portion 121 and the mirror body 110 is located at the root of the fixed spring 120, and the second curved portion 122 terminates at a free end. The two curved portions 121 and 122 bend in opposite directions, forming an S-shaped continuous curvature structure. When the first curved portion 121 protrudes toward the transmissive surface 110a, the second curved portion 122 protrudes away from the transmissive surface 110a. For example, in this embodiment, the first curved portion 121 protrudes toward the transmissive surface 110a, while the second curved portion 122 protrudes away from the transmissive surface 110a.

[0053] Specifically, when the fixing spring 120 is inserted into the mounting slot 201, the free end of the second curved portion 122 first enters the mounting slot 201. Its arc-shaped structure acts as a guide, allowing the second curved portion 122 to slide smoothly into the mounting slot 201 and contact the inner wall of the slot, causing compression and deformation. At this point, the first curved portion 121 is subjected to a reverse force and undergoes elastic deformation in the same direction. As the fixing spring 120 continues to penetrate deeper into the mounting slot 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 slot 201 in the first direction, generating pressure. Due to the elastic properties 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 accommodate the actual dimensions of the mounting slot 201.

[0054] The reversed curvature 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 simultaneously displace toward each other when subjected to force. During elastic deformation, the coordinated deformation of the first curved portion 121 and the second curved portion 122 not only disperses stress concentration but also maintains linear contact between the contact surface and the wall of the mounting groove 201 through the curvature change, preventing contact failure due to localized deformation. Consequently, the fixing spring 120 consistently provides a uniform elastic preload during compression, ensuring the stable fixation of the lens 100 within 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 walls 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. That is, the design size of the mounting groove 201 is larger than the natural size of the fixing spring 120 when not subjected to external forces. When the size of the mounting groove 201 is not reduced by external forces, the fixing spring 120 can slide smoothly into the mounting groove 201 without elastic deformation, thereby achieving rapid mating between the lens 100 and the mounting bracket 200. In addition, a certain margin is retained to prevent the size of the mounting groove 201 from being reduced due to external forces, making it less likely that the size of the mounting groove 201 will be reduced to the elastic compression limit of the fixing spring 120.

[0057] The width of the fixing spring 120 is designed to be 70% of the depth of the mounting slot 201. This ensures that, after the fixing spring 120 is inserted into the mounting slot 201, a gap is formed between the edge of the fixing spring 120 facing away from the lens body 110 and the bottom of the mounting slot 201. This gap provides sufficient space for the fixing spring 120 to elastically deform. When the fixing spring 120 elastically deforms within the mounting slot 201, this gap ensures that the fixing spring 120 does not cause excessive compression and friction with the bottom of the mounting slot 201, thereby protecting the integrity of the fixing spring 120 and extending its service life. Furthermore, this gap allows the fixing spring 120 to have a certain range of movement within the mounting slot 201, enhancing the flexibility of adjusting the position of the lens 100 relative to the mounting bracket 200.

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

[0059] The fixing spring 120 is positioned midway along the length of the mirror body 110, ensuring 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 minimizing the risk of structural redundancy caused by excessive length. This ratio balances elastic deformation space with structural strength, preventing the spring from deflecting when sliding within the mounting slot 201.

[0060] Specifically, the central placement of the fixing spring 120 ensures that the center of gravity of the mirror body 110 in the third direction coincides with its support point, reducing the risk of jamming due to offset force during installation. The length of the fixing spring 120 is designed to be 7:10 relative to the length of the mirror body 110, forming an effective support section along the overall length of the mirror body 110 and ensuring that the contact area between the spring and the mounting slot 201 covers the primary load-bearing area of ​​the mirror body 110. When the mirror body 110 is subjected to external forces, the fixing spring 120 absorbs dimensional deviations through its own elastic deformation. At the same time, a specific length ratio at the center ensures uniform deformation on both sides of the fixing spring 120, preventing structural failure caused by excessive compression on one side. For example, if the mirror body 110 is 100 mm long, the fixing spring 120 is 70 mm long. This dimension provides sufficient elastic travel without increasing frictional resistance with the sidewalls of the mounting slot 201 due to excessive spring length.

[0061] In some embodiments, the fixing spring 120 is provided with a hollow slot 1201 extending along a third direction. The hollow slot 1201 is a hollow structure extending through the fixing spring 120, which serves to reduce the weight of the fixing spring 120 while weakening the structural strength of the portions of the fixing spring 120 on either side of the hollow slot 1201, allowing these portions to bend more easily and deform elastically. The shape of the hollow slot 1201 can be circular, elliptical, rectangular, or other suitable shapes. The specific shape can be determined based on the overall structure of the spring and the required deformation. The location and number of the hollow slots 1201 can be arbitrary. In this embodiment, the hollow slot 1201 is elongated and provided on the first curved portion 121. The hollow slot 1201 is located in the middle portion of the first curved portion 121, so that the remaining portions of the first curved portion 121 on either side of the hollow slot 1201 are of equal length. This design ensures that the first curved portion 121 deforms evenly when subjected to pressure, avoiding structural damage caused by stress concentration.

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

[0063] Specifically, the longitudinal length of the hollow groove 1201 accounts for 80% of the total length of the fixing spring 120, creating a continuous elastic deformation region for the fixing spring 120 in the third direction. When the fixing spring 120 is compressed, the solid portions on either side of the hollow groove 1201 bend symmetrically, causing the distance between the first contact surface 120a and the second contact surface 120b to decrease evenly. The lateral width of the hollow groove 1201 accounts for 60% of the width of the fixing spring 120, ensuring sufficient material removal to reduce rigidity while retaining 40% of the solid width to maintain structural stability. This dimensional configuration ensures that the fixing spring 120 maintains linear deformation characteristics in the second direction, avoiding excessive local stress caused by an excessively large hollow area. During installation, the presence of the hollow groove 1201 reduces the overall stiffness of the spring, allowing for greater elastic deformation under the same external force, thereby effectively compensating for dimensional deviations between the installation groove 201 and the fixing spring 120.

[0064] In some embodiments, the fixing spring 120 is integrally formed with the mirror body 110. 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 made of polycarbonate or PMMA, ensuring that there are no stress concentration points between the fixing spring 120 and the mirror body 110 during elastic deformation. This integrally molded structure eliminates gaps at the connection between the fixing spring 120 and the mirror body 110, ensuring that the elastic deformation of the fixing spring 120 when squeezed by the mounting slot 201 is evenly distributed throughout the entire structure, avoiding the plastic deformation or fracture caused by localized stress concentration in a separate structure. Furthermore, this structure maintains synchronized thermal expansion between the fixing spring 120 and the mirror body 110 in high-temperature environments, preventing separation of the contact surfaces due to material differences and ensuring stable double-sided contact within the mounting slot 201.

[0065] In summary, this application utilizes the elastic connection between the fixing spring 120 and the mounting slot 201 to allow for a certain degree of mismatch in the dimensions of the fixing spring 120 and the mounting slot 201 during installation. The deformability of the fixing spring automatically compensates for this dimensional difference, preventing installation jams or failures caused by dimensional mismatch. Furthermore, this solution reduces the processing requirements for the precision of the mounting bracket 200 and the molding accuracy of the lens 100, effectively improving production yield and reducing rework costs.

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

Claims

1. A lens, characterized in that: include: A mirror body having a transmission surface and a light emitting surface facing each other in a first direction; Two fixing springs are respectively located on opposite sides of the mirror body in the second direction, and the fixing springs extend along a third direction, and any two of the first direction, the second direction, and the third direction are perpendicular to each other; In which, the fixed spring piece is used to be slidably connected in the mounting groove of the external structure, and has a first contact surface and a second contact surface opposite to each other in the 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, and the fixed spring piece can be elastically deformed 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, wherein The fixing spring comprises: a first curved portion connected to the mirror body, wherein a convex surface of the first curved portion forms the first contact surface; The second curved portion is connected to an 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 convex surface of the second curved portion forms the second contact surface.

3. The lens according to claim 2, wherein: The first curved portion protrudes toward the transmission surface, and the second curved portion protrudes away from the transmission surface.

4. The lens according to claim 1, wherein 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, wherein In the third direction, the fixing spring is located in the middle of the mirror body, and the ratio of the length of the fixing spring to the length of the mirror body is 7:

10.

6. The lens according to claim 1, wherein The fixing spring piece is provided with a hollow groove extending along the third direction.

7. The lens according to claim 6, wherein: In the third direction, the ratio of the length of the hollow groove to the length of the fixing spring is 4:5; And / or, in the second direction, the ratio of the width of the hollow groove to the width of the fixing elastic piece is 3:

5.

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

9. The lens according to any one of claims 1 to 7, characterized in that: The mirror body comprises: a transmission portion, the central axis of which is parallel to the first direction, and the transmission surface is located at one end of the transmission portion; The light emitting portion is arranged at one end of the transmission portion facing away from the transmission surface, and the side of the light emitting portion facing away from the transmission portion forms the light emitting surface; the fixing elastic piece is connected to the two opposite ends of the light emitting portion in the second direction.

10. A blackboard lamp, characterized in that: include: The mounting bracket is provided with two mounting slots facing each other in the second direction; According to any one of claims 1 to 9, the fixing springs are respectively slidably connected to the corresponding mounting grooves.

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