Lens and blackboard light

Abstract

The application provides a lens and a blackboard lamp, and relates to the technical field of lighting lamps. The lens comprises a transmission part and a light-emitting part. The transmission part has a transmission surface at one end of the axial direction and a total reflection surface around the circumferential side. The light-emitting part is connected to the side of the transmission part away from the transmission surface. A plurality of refractive protrusions are arranged on the side of the light-emitting part away from the transmission part. The refractive protrusions extend along a first direction, and the plurality of refractive protrusions are arranged along a second direction. The first direction is perpendicular to the irradiated surface, and the second direction is perpendicular to the first direction. The side surface of the plurality of refractive protrusions away from the light-emitting part forms a light-emitting surface opposite to the transmission surface. The lens provided by the application has high light utilization and uniform light distribution effect, and the light is not easy to directly irradiate the eyes of the user, thereby improving the use experience of the user.

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 lights are important lighting devices in educational settings, used to provide uniform and bright illumination to the blackboard area in classrooms, creating a good visual environment for teachers and students. However, current blackboard lights emit poor lighting effects and uneven illuminance distribution, easily shining directly into the eyes of teachers positioned directly below, causing eye strain and even discomfort. Utility Model Content

[0003] The purpose of this application is to provide a lens and a blackboard light to solve the defects of existing blackboard lights, such as poor lighting effect and light that easily shines directly into the teacher's eyes, causing eye fatigue and discomfort.

[0004] To achieve the above objectives, in a first aspect, this application provides a lens, comprising:

[0005] The transmissive part has a transmissive surface located at one end of its axial direction and a total reflection surface surrounding its periphery;

[0006] The light-emitting part is connected to the side of the transmission part that is away from the transmission surface. A plurality of refractive protrusions are provided on the side of the part that is away from the transmission part. The refractive protrusions extend along a first direction and the plurality of refractive protrusions are arranged along a second direction. The first direction is perpendicular to the irradiated surface and the second direction is perpendicular to the first direction. The surface of the side of the plurality of refractive protrusions that is away from the light-emitting part forms a light-emitting surface that is opposite to the transmission surface.

[0007] In some embodiments of the first aspect, the transmissive surface is a curved surface that convexes in the direction away from the light-emitting portion.

[0008] In some embodiments of the first aspect, the cross-sectional shape of the transmission surface on any plane passing through the central axis of the transmission section is a first curve, the first curve conforming to a curve function:

[0009] F1(x) = P11*x^2 + P12*x + P13;

[0010] Where x is the position parameter of the lens; P11∈[0.0782, 0.087]; P12∈[-0.0321, 0.0059]; P13∈[6.9067, 6.9345].

[0011] In some embodiments of the first aspect, the total reflection surface is a conical surface that gradually expands from the transmission surface toward the light-emitting surface.

[0012] In some embodiments of the first aspect, the cross-sectional shape of the total reflection surface on any plane passing through the central axis of the transmission section is a second curve, the second curve conforming to a curve function:

[0013] F2(x)=P21*x^3+P22*x^2+P23*x+P24;

[0014] Where x is the position parameter of the lens; P21∈[0.0008, 0.0020]; P22∈[-0.0232, 0.0129]; P23∈[0.9613, 1.3087]; P24∈[-6.5827, -5.5187].

[0015] In some embodiments of the first aspect, the transmissive portion has a recessed hole on the side opposite to the light-emitting portion, the recessed hole is used to accommodate the light-emitting element of the external structure, and the inner wall surface of the recessed hole opposite to its opening forms the transmissive surface.

[0016] In some embodiments of the first aspect, the lens further includes a fixing portion disposed on the transmissive portion and / or the light-emitting portion, the fixing portion being used for sliding connection with an external structure.

[0017] Secondly, this application provides a blackboard lamp, comprising:

[0018] A bracket assembly having a mounting cavity extending along the second direction, the mounting cavity having a light exit cavity opening;

[0019] As described in the first aspect and any of its optional embodiments, the lens is slidably connected to the mounting cavity along the second direction, a plurality of the lenses are arranged along the second direction, and a plurality of the light-emitting surfaces of the plurality of lenses jointly shield the light-emitting cavity opening;

[0020] A light source assembly is disposed within the mounting cavity and extends along the second direction for emitting light toward the plurality of lenses.

[0021] In some embodiments of the second aspect, the blackboard light further includes a hanging rod connected to the bracket assembly for suspending the bracket assembly in the mounting position.

[0022] In some embodiments of the second aspect, the blackboard light further includes a driving power supply connected to the bracket assembly and electrically connected to the light source assembly for inputting electrical energy to the light source assembly.

[0023] The beneficial effects of the lens and blackboard lamp provided in this application are as follows: Compared with the prior art, by using the lens of this application, light can be fully refracted by the transmission part and reflected by the total internal reflection surface, and then refracted by multiple refractive protrusions in the light-emitting part, so that the light shines evenly on the illuminated surface at a predetermined angle and with a uniform illuminance distribution. In addition, since the multiple refractive protrusions in the light-emitting part extend along the first direction and are arranged along the second direction, with the first direction perpendicular to the illuminated surface and the second direction perpendicular to the first direction, the light emission angle and illuminance distribution can be further adjusted, so that the light does not directly enter the eyes of the teacher located below the blackboard lamp, avoiding eye fatigue and discomfort for the teacher.

[0024] Furthermore, based on the aforementioned lens, the installation distance between the blackboard light and the blackboard can be further shortened to 100-200mm. Compared to the 700-1000mm in the prior art, this achieves a shorter installation distance while still ensuring uniform illumination in the blackboard area and improving the lighting effect. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the structure of the blackboard lamp in the embodiment of this application;

[0027] Figure 2 This is an exploded view of the blackboard lamp in the embodiments of this application;

[0028] Figure 3 This is a cross-sectional view of the blackboard lamp in an embodiment of this application;

[0029] Figure 4 This is a front view of the lens in an exemplary embodiment of this application;

[0030] Figure 5 This is a top view of the lens in an exemplary embodiment of this application;

[0031] Figure 6 This is a diagram showing the usage state of the lens in an exemplary embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the lens structure in another exemplary embodiment of this application;

[0033] Figure 8This is a schematic diagram of the lens structure from another perspective in another exemplary embodiment of this application;

[0034] Figure 9 This is a cross-sectional view of the lens in another exemplary embodiment of this application;

[0035] Figure 10 for Figure 9 Enlarged view of section A;

[0036] Figure 11 This is a partial view of the connection relationship between the lens and the supporting housing in another exemplary embodiment of this application.

[0037] The following are the labeling elements in the figure:

[0038] 100-Bracket assembly; 110-Support housing; 1101-Mounting cavity; 1102-Mounting groove; 1103-Fixing hole; 120-Side baffle; 1201-Through hole; 1202-Positioning groove; 130-Screw; 140-Cover plate; 200-Light source assembly; 210-Circuit board; 220-LED bead; 300-Lens; 310-Transmitting part; 311-Concave hole; 3101-Transmitting surface; 3102-Total reflection surface; 320-Light emitting part; 321-Refracting protrusion; 3211-Light emitting surface; 330-Fixing part; 330a-First contact surface; 330b-Second contact surface; 331-First bending section; 332-Second bending section; 3301-Hollow slot; 400-Hanging rod; 500-Drive power supply. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] This application provides a blackboard lamp, as shown in the embodiments below. Figures 1-11 The blackboard light includes: a bracket assembly 100, a light source assembly 200, a lens 300, a hanging rod 400, and a driver power supply 500. The bracket assembly 100 supports and secures the light source assembly 200, the lens 300, and the driver power supply 500. The light source assembly 200 emits light towards the lens 300, which focuses and guides the light, ensuring even illumination on the blackboard and improving lighting effect and comfort. The driver power supply 500 provides stable power to the light source assembly 200, ensuring the blackboard light operates normally. The hanging rod 400 suspends the bracket assembly 100 from a ceiling or other mounting location.

[0044] Reference Figures 1-3 In some embodiments, the bracket assembly 100 may include a support housing 110, which may be an elongated housing structure. An elongated mounting cavity 1101 is formed inside the support housing 110, and the mounting cavity 1101 has a light outlet.

[0045] The support housing 110 can be made of metal or plastic. Preferably, the support housing 110 is made of aluminum alloy to provide better heat dissipation and lighter weight. The support housing 110 can be integrally molded, for example, by a stretching process, to ensure the structural strength and stability of the support housing 110.

[0046] The mounting cavity 1101 of the supporting housing 110 is used to accommodate the light source assembly 200 and the lens 300. Multiple lenses 300 can be arranged along the extending direction of the mounting cavity 1101 and collectively close the light outlet of the mounting cavity 1101. The light source assembly 200 is located on the side of the multiple lenses 300 facing away from the light outlet and emits light towards the lenses 300, so that the light is uniformly emitted from the light outlet after refraction and reflection by the lenses 300. After the supporting housing 110 is fixed in the mounting position, the orientation of the light outlet of the mounting cavity 1101 can be determined according to the refraction effect of the lens 300 on the light; for example, the light outlet of the mounting cavity 1101 can face directly below the supporting housing 110.

[0047] At least one extended end of the support housing 110 may have an inlet / outlet communicating with the mounting cavity 1101 and the external space, so as to facilitate the installation of the light source assembly 200 and the plurality of lenses 300 into the mounting cavity 1101 through the inlet / outlet. Preferably, both extended ends of the support housing 110 have inlets / outlets, so that installation or removal work can be performed on both sides of the support housing 110.

[0048] In some embodiments, the bracket assembly 100 may further include a side baffle 120, which is detachably connected to the extension end of the support housing 110 and closes the inlet and outlet to prevent the lens 300 and the light source assembly 200 in the mounting cavity 1101 from coming out and to provide protection.

[0049] The side baffle 120 can have the same shape as the extended end of the support housing 110. The side baffle 120 can be detachably connected to the support housing 110 by one or more of the following methods: snap-fit ​​connection, magnetic connection, or fastener connection, so as to facilitate the installation, removal, and maintenance of the internal light source assembly 200 or lens 300. The number of side baffles 120 is the same as the number of inlets and outlets on the support housing 110. When both extended ends of the support housing 110 are provided with inlets and outlets, there are two side baffles 120, which are respectively connected to the two extended ends of the support housing 110.

[0050] The side baffle 120 and the supporting housing 110 can be magnetically connected. A magnet can be provided on the side of the side baffle 120 facing the supporting housing 110, and the supporting housing 110 can be attracted by the magnet so that the side baffle 120 can be magnetically attracted to the end face of the supporting housing 110.

[0051] The bracket assembly 100 may also include screws 130. A through hole 1201 may be provided on the side baffle 120, and a fixing hole 1103 is formed on the extended end of the supporting housing 110. When the side baffle 120 abuts against the extended end of the supporting housing 110, the through hole 1201 and the fixing hole 1103 are aligned. The side baffle 120 can be fixed to the extended end of the supporting housing 110 by passing the screw 130 through the through hole 1201 and screwing it into the fixing hole 1103. Each side baffle 120 can be fixed by two or more screws 130, and the number of through holes 1201 on the side baffle 120 and the number of fixing holes 1103 on the supporting housing 110 are equal to the number of screws 130.

[0052] The side baffle 120 can be connected to the support housing 110 simultaneously via magnetic attraction and screws 130. During installation, the magnetic connection between the side baffle 120 and the support housing 110 provides initial positioning of the side baffle 120, facilitating the subsequent screw connection (130) without requiring continuous support of the side baffle 120 during the screw connection process. The screws 130 further reinforce the connection between the side baffle 120 and the support housing 110, preventing the side baffle 120 from falling off the support housing 110.

[0053] The bracket assembly 100 may also include a cover plate 140, which is connected to the side of the side baffle 120 facing away from the support housing 110 and covers the screws 130 to protect the screws 130 and prevent the screws 130 from being exposed to the outside, thereby improving the overall aesthetics of the bracket assembly 100.

[0054] The cover plate 140 and the side baffle 120 can be connected by adhesive, snap-fit, or magnetic connection. For example, when a magnet is installed on the side baffle 120, the cover plate 140 can be made of a metal material that can be attracted by the magnet, so that it can be magnetically attracted to the side baffle 120 at the same time, thus achieving the connection between the cover plate 140 and the side baffle 120. The side baffle 120 facing away from the supporting housing 110 may also have a positioning groove 1202. A through hole 1201 for the screw 130 to pass through is opened in the positioning groove 1202. The shape of the cover plate 140 can be the same as the shape of the positioning groove 1202 and is embedded in the positioning groove 1202, which can improve the aesthetics and ensure the connection strength between the cover plate 140 and the side baffle 120.

[0055] The suspension rod 400 can be a vertically extending rod-like structure. The suspension rod 400 can be connected to the support housing 110 in the bracket assembly 100 to fix the support housing 110 in a suitable installation position. Specifically, the top end of the suspension rod 400 can be fixed to the ceiling or other installation position using expansion bolts or similar methods. The bottom end of the suspension rod 400 can be connected to the side of the support housing 110 facing away from the light outlet using snap-fit ​​or screw 130 methods to suspend the support housing 110 at the corresponding height. The number of suspension rods 400 can be arbitrary; for example, two suspension rods 400 can be provided, symmetrically connected to both sides of the support housing 110 in the extension direction to improve the stability of the blackboard light after installation.

[0056] The light source component 200 can be an LED light source, a fluorescent lamp, or other types of lighting source. The light emission color of the light source component 200 can be white, warm white, or other desired colors to meet the lighting needs of different scenarios.

[0057] Reference Figure 2 and Figure 6In some embodiments, the light source assembly 200 may include a circuit board 210 and a plurality of light emitters disposed on the circuit board 210. The circuit board 210 may be elongated, and the plurality of light emitters are arranged at intervals along the extension direction of the circuit board 210. The circuit board 210 may be fixed in the mounting cavity 1101 of the supporting housing 110 by means of fasteners or clips. The driving assembly is connected to the circuit board 210, so that the circuit board 210 is connected to an external power supply through the driving assembly. The light emitters may be LED beads 220, and the number of light emitters may be the same as the number of lenses 300 in the mounting cavity 1101. Each light emitter corresponds to the side of each lens 300 facing away from the light outlet, so that the light can be refracted by each lens 300 and emitted from the light outlet in a one-to-one correspondence.

[0058] Reference Figures 3-9 The lens 300 may include a transmission section 310 and a light-emitting section 320. The transmission section 310 has a transmission surface 3101 located at one end of its axial direction and a total reflection surface 3102 located on its periphery. The light-emitting section 320 is connected to one end of the transmission section 310 facing away from the transmission surface 3101, and a plurality of refractive protrusions 321 protrude from the side of the light-emitting section 320 facing away from the transmission section 310. The refractive protrusions 321 extend along a first direction, and the plurality of refractive protrusions are arranged along a second direction. The side of the plurality of refractive protrusions 321 facing away from the light-emitting section 320 together forms a light-emitting surface 3211, and the second direction is perpendicular to the first direction. The first direction is perpendicular to the illumination surface illuminated by the blackboard lamp, such as the surface of a blackboard vertically mounted on a wall, in which case the first direction is a horizontal direction perpendicular to the surface of the blackboard. The second direction may be the extension direction of the mounting cavity 1101.

[0059] The transmissive part 310 and the light-emitting part 320 are both made of light-transmitting materials, such as optical glass or transparent plastic. The transmissive part 310 and the light-emitting part 320 can be transparent or have a specific color.

[0060] The transmissive section 310 can be a rotating structure with a central axis. The transmissive surface 3101 is located at one end of the transmissive section 310 along its axial direction and is used to receive light and refract it into the interior of the transmissive section 310. The transmissive surface can be a curved surface with a certain shape to fully refract light and reduce reflection at the transmissive surface 3101. The transmissive surface can also be set as a plane according to other lighting requirements. The total internal reflection surface 3102 is the peripheral surface of the transmissive section 310 and is used to reflect light transmitted from the transmissive section 310 to the light-emitting section 320, reducing light transmission at the total internal reflection surface 3102 and allowing more light to be transmitted to the light-emitting section 320.

[0061] The light-emitting portion 320 is disposed at the other end of the transmissive portion 310 along its axial direction. The shape of the light-emitting portion 320 can match the shape of the end surface of the transmissive portion 310 facing away from the transmissive surface 3101. For example, when the transmissive portion 310 is a rotating structure, the end surface of the transmissive portion 310 facing away from the transmissive surface 3101 is circular, and the light-emitting portion 320 can be circular or other shapes that match a circle. The light-emitting portion 320 and the transmissive portion 310 can be integrally formed to ensure the light-emitting effect of the lens 300.

[0062] Reference Figures 4-6 In an exemplary embodiment, the light-emitting portion 320 is circular, and the diameter of the light-emitting portion 320 is the same as the diameter of one end surface of the transmission portion 310 facing away from the transmission surface 3101.

[0063] Reference Figures 7-9 In another exemplary embodiment, the light-emitting portion 320 can be square, with its side length being equal to the diameter of one end surface of the transmissive portion 310 facing away from the transmissive surface 3101, and the contour of one end of the transmissive portion 310 facing away from the transmissive surface 3101 is inscribed inside the surface of the light-emitting portion 320.

[0064] The refractive protrusion 321 is an elongated protrusion structure protruding from the surface of the light-emitting part 320, and the extension direction of the refractive protrusion 321 is perpendicular to the irradiated surface. Multiple refractive protrusions 321 are arranged in the second direction. Adjacent refractive protrusions 321 can be continuous or have a certain spacing to form multiple refractive protrusions 321 spaced apart in the second direction. The surfaces of the multiple refractive protrusions 321 facing away from the light-emitting part 320 together constitute the light-emitting surface 3211, that is, the light-emitting surface 3211 is a curved surface with multiple continuous undulations in the second direction.

[0065] The orthographic projection shape of the refractive protrusion 321 on a plane perpendicular to the first direction can be an arc shape, a triangle shape, a continuous wave shape, or any other arbitrary shape protruding from the light-emitting part 320.

[0066] Part of the light rays entering the lens 300 through the transmission surface 3101 directly illuminate the light-emitting surface 3211, while another part of the light rays are reflected by the total internal reflection surface 3102 and also illuminate the light-emitting surface 3211. When the light rays exit through the light-emitting surface 3211, they are refracted and dispersed on both sides of the refractive protrusion 321, thereby improving the uniformity and softness of the light rays exiting the light-emitting surface 3211. Simultaneously, because the extension direction of the refractive protrusion 321 is perpendicular to the illuminated surface during use, the emitted light rays can be evenly distributed on the illuminated surface, reducing glare and eye strain. The illuminated surface is also less prone to localized overexposure or underexposure, improving lighting comfort and effectiveness. Furthermore, the light will not directly illuminate the user's eyes located below the lens 300, further reducing glare and eye strain and protecting the user's visual health.

[0067] When the lens 300 is placed in the mounting cavity 1101, the transmission surface 3101 of the lens 300 faces the corresponding light-emitting body in the light source assembly 200, the light-emitting surface 3211 faces the light-emitting port of the mounting cavity 1101, and the extension direction of the refractive protrusion 321 is perpendicular to the extension direction of the mounting cavity 1101, so that when the support assembly 100 is parallel to the irradiated surface, the extension direction of the refractive protrusion 321 can be perpendicular to the irradiated surface. Two adjacent lenses 300 can be connected to each other, and two adjacent light-emitting surfaces 3211 can be connected, so that the multiple light-emitting surfaces 3211 of multiple lenses 300 can jointly close the light-emitting port, and the light emitted from the light-emitting port is refracted and dispersed by the light-emitting surfaces 3211 of each lens 300.

[0068] In some embodiments, a recessed hole 311 is provided at one end of the transmissive portion 310 facing away from the light-emitting portion 320, and a transmissive surface 3101 is formed on the inner wall surface of the recessed hole 311 facing away from its opening.

[0069] When the transmission part 310 is a rotating structure, the recess 311 can be a circular hole. When the transmission part 310 has other structures, the shape of the recess 311 can also be set as an elliptical hole, a square hole, or other polygonal holes according to actual needs. After the lens 300 is installed in the bracket assembly 100, the light-emitting element in the light source assembly 200 can be embedded in the recess 311 of the corresponding lens 300, so that the light emitted by the light-emitting element directly illuminates the transmission surface 3101 inside the recess 311. At the same time, the light diffused to the circumferential inner wall of the recess 311 can also be transmitted into the transmission part 310 and reflected by the total reflection surface 3102 to illuminate the light-emitting surface 3211, thereby improving the utilization rate of light.

[0070] In some embodiments, the transmissive surface 3101 can be a curved surface protruding away from the light-emitting portion 320. The curved surface protruding away from the light-emitting portion 320 can cause light to be refracted when it passes through the transmissive surface 3101, which can focus and guide the light, so that more light can be concentrated and irradiated towards the light-emitting surface 3211.

[0071] The transmissive surface 3101 can be a spherical, ellipsoidal, or parabolic surface, etc., with the central axis of the transmissive section 310 as a reference, to fully refract light and improve light utilization and illumination effect. The cross-sectional shape of the transmissive surface 3101 on any plane passing through the central axis of the transmissive section 310 is a first curve, that is, the transmissive surface 3101 is formed by rotating the first curve around the central axis. The first curve can be a single curve or a combination of two or more curves.

[0072] In some embodiments, the first curve may conform to the following curve function:

[0073] F1(x) = P11*x^2 + P12*x + P13

[0074] Where x is the position parameter of lens 300; P11∈[0.0782, 0.087]; P12∈[-0.0321, 0.0059]; P13∈[6.9067, 6.9345].

[0075] The position parameters of lens 300 can be its position coordinates. Specifically, a Cartesian coordinate system can be established on the vertical plane where lens 300 is located, with a point on the illuminated surface as the origin. The X-axis of this coordinate system can be the first direction, i.e., the extension direction of the refractive protrusion 321; the Y-axis of this coordinate system can be the axis of the transmission part 310, i.e., the vertical direction. The coordinate positions (X0, Y0) of lens 300 can be the horizontal distance between lens 300 and the origin of the illuminated surface, and the vertical distance between lens 300 and the illuminated surface, respectively.

[0076] The values ​​of P11, P12, and P13 can be determined based on the specific installation location of the lens 300 and the desired lighting effect. In practice, the lighting effect of the lens 300 can be simulated using simulation software to determine the optimal values ​​of P11, P12, and P13, thereby enabling the lens 300 to meet specific lighting requirements.

[0077] When P11 < 0.0782, P12 < -0.0321, or P1 < 6.9067, the transmission surface 3101 formed by rotating the first curve around the central axis may not produce a sufficient refraction angle for the light, causing the light to not fully illuminate in the predetermined direction, thus reducing the utilization rate of the light and the lighting effect. When P11 > 0.087, P12 > 0.0059, or P13 > 6.9345, the transmission surface 3101 formed by rotating the first curve around the central axis may produce an excessively large refraction angle for the light, causing the light to be too concentrated or deviate from the predetermined illumination direction, which will also reduce the utilization rate of the light and the lighting effect.

[0078] By restricting the values ​​of P11, P12, and P13 to P11∈[0.0782, 0.087], P12∈[-0.0321, 0.0059], and P13∈[6.9067, 6.9345], the transmission surface 3101 formed by rotating the first curve around the central axis can have a suitable light refraction angle. This allows the light to be fully directed in the predetermined direction, improving the utilization rate and illumination effect of the light, while also preventing the light from being too concentrated or deviating from the predetermined illumination direction, ensuring that the light can be uniformly irradiated on the irradiated surface.

[0079] Preferably, P11 = 0.0830, P12 = -0.0131, and P13 = 6.9206. In this case, the transmission surface 3101 formed by rotating the first curve around the central axis has a better light refraction effect. The light refracted by the transmission surface 3101 can be emitted more evenly from the light-emitting surface 3211. Furthermore, the continuously undulating light-emitting surface 3211 reduces glare and eye strain, improving lighting comfort and effectiveness.

[0080] In some embodiments, the cross-sectional shape of the transmissive portion 310 on any plane passing through the central axis is an flared shape that expands toward the light-emitting portion 320.

[0081] The total reflection surface 3102 formed on the periphery of the flared transmission section 310 is also a flared curved surface facing the light-emitting section 320, which enables more light entering the transmission section 310 to be transmitted to the light-emitting section 320 after one or more reflections, thereby improving the utilization rate of light.

[0082] As the transmissive portion 310 gradually expands toward the light-emitting portion 320, its cross-sectional shape can gradually change, for example, from a circle to an ellipse or other shapes. The cross-sectional shape of the transmissive portion 310 can also remain the same, for example, always remaining a circle with its diameter gradually increasing. For example, the transmissive portion 310 is a rotating structure, and the total reflection surface 3102 can be a conical surface, a parabolic surface, or other arbitrarily shaped surface.

[0083] When the transmission section 310 is a rotating structure, the cross-sectional shape of the total reflection surface 3102 on any plane passing through the central axis is the second curve, that is, the total reflection surface 3102 is formed by rotating the second curve around the central axis. The second curve can be a single curve or a combination of multiple curves.

[0084] In some embodiments, the second curve may conform to the following curve function:

[0085] F2(x)=P21*x^3+P22*x^2+P23*x+P24

[0086] Where x is the position parameter of lens 300; P21∈[0.0008, 0.0020]; P22∈[-0.0232, 0.0129]; P23∈[0.9613, 1.3087]; P24∈[-6.5827, -5.5187].

[0087] The positional parameters of lens 300 can also be the relative positions of lens 300 and the illuminated surface as described above, which will not be repeated here. The values ​​of P21, P22, P34, and P24 can also be determined based on the specific installation position of lens 300 and the desired lighting effect. In practice, the lighting effect of lens 300 can be simulated using simulation software to determine the optimal values ​​of P21, P22, P23, and P24, so that lens 300 can meet specific lighting requirements.

[0088] When P21 < 0.0008, P22 < -0.0232, P23 < 0.9613, or P24 < -6.5827, the total internal reflection surface 3102 formed by rotating the second curve around the central axis may not produce enough reflections or reflection angles for the light, resulting in insufficient light transmission to the light-emitting section 320, thus reducing the utilization rate of light and the illumination effect. When P21 > 0.0020, P22 > 0.0129, P23 > 1.3087, or P24 > -5.5187, the total internal reflection surface 3102 formed by rotating the second curve around the central axis may cause the light to reflect too many times or at too large a reflection angle inside the transmission section 310, resulting in the light being too scattered or deviating from the predetermined illumination direction, which will also reduce the utilization rate of light and the illumination effect.

[0089] By restricting the values ​​of P21, P22, P23, and P24 to P21∈[0.0008, 0.0020], P22∈[-0.0232, 0.0129], P23∈[0.9613, 1.3087], and P24∈[-6.5827, -5.5187], the total reflection surface 3102 formed by rotating the second curve around the central axis can have a suitable number of light reflections and reflection angles. This allows the light to be transmitted to the light-emitting part 320 after undergoing an appropriate number of reflections inside the transmission part 310, improving the utilization rate of light and the illumination effect. At the same time, it can also prevent the light from being too scattered or deviating from the predetermined illumination direction, ensuring that the light can be uniformly irradiated on the irradiated surface.

[0090] Preferably, P21 = 0.0014, P22 = -0.0051, P23 = 1.1350, and P24 = -6.0507. In this case, the total reflection surface 3102 formed by rotating the second curve around the central axis has a better light reflection effect, which, in conjunction with the transmission surface 3101 and the light-emitting surface 3211, can further improve the utilization rate of light and the illumination effect.

[0091] In some embodiments, the lens 300 may further include a fixing part 330, which may be connected to the transmission part 310 and / or the light-emitting part 320. The fixing part 330 is used to slide with the support housing 110 so that the lens 300 can slide into the mounting cavity along the extension direction of the support housing 110, thereby realizing the installation of the lens 300 and the bracket assembly 100.

[0092] The fixing part 330 may be a protruding structure protruding from the surface of the transmitting part 310 or the light emitting part 320 in a first direction. The interior of the supporting housing 110 may also be provided with a mounting groove 1102, the extending direction of which is parallel to the extending direction of the mounting cavity. When the lens 300 slides into the mounting cavity from the inlet / outlet, the fixing part 330 can slide into the mounting groove 1102, which can limit the fixing part 330, ensuring the lens 300 remains stable within the mounting cavity. The transmitting part 310, the light emitting part 320, and the fixing part 330 can be integrally formed; for example, the entire lens 300 can be manufactured using an injection molding process to improve the structural strength and overall aesthetics of the lens 300.

[0093] Preferably, there are two fixing parts 330, which are symmetrically arranged on opposite sides of the light-emitting part 320 in the first direction. The support housing 110 has two mounting grooves 1102 with facing openings inside. When the lens 300 enters the mounting cavity 1101, each fixing part 330 is slidably connected in the corresponding mounting groove 1102 to further improve the positional stability of the lens 300 in the mounting cavity 1101.

[0094] In some embodiments, the fixing part 330 may be a protrusion protruding from one side of the light-emitting part 320 in a first direction. The shape of the protrusion matches the shape of the mounting groove 1102 and can be slidably connected within the mounting groove 1102.

[0095] Reference Figures 7-10 In some embodiments, the fixing part 330 may be a fixing spring that protrudes from one side of the light-emitting part 320 in a first direction. The fixing spring may have a first contact surface 330a and a second contact surface 330b that are opposite to each other in the first direction. At least one of the first contact surface 330a and the second contact surface 330b is used to abut against two inner wall surfaces opposite to each other in the first direction of the mounting groove 1102, and the fixing spring can elastically deform to reduce the distance between the first contact surface 330a and the second contact surface 330b on the central axis of the transmission part 310.

[0096] Reference Figure 11When the size of the mounting groove 1102 becomes smaller due to processing errors or external environmental factors, the fixing spring can reduce the distance between the first contact surface 330a and the second contact surface 330b through elastic deformation, so that the fixing spring can slide smoothly into the mounting groove 1102. At this time, the rebound force generated by the elastic deformation can ensure that the fixing spring maintains stable contact with the inner wall of the mounting groove 1102, preventing the lens 300 from becoming loose.

[0097] In some embodiments, the fixing spring may include a first curved section 331 and a second curved section 332. The first curved section 331 is connected to the lens body and its protruding surface forms a first contact surface 330a. The second curved section 332 is connected to the end of the first curved section 331 and its bending direction is opposite to that of the first curved section 331. Its protruding surface forms a second contact surface 330b.

[0098] The first bending segment 331 and the second bending segment 332 together form a continuous S-shaped bending structure. The first bending segment 331 protrudes towards the transmission surface 3101, while the second bending segment 332 protrudes away from the transmission surface 3101. When the fixing spring is inserted into the mounting groove 1102, the free end of the second bending segment 332 first contacts the inner wall of the groove and deforms under pressure. At this time, the first bending segment 331 undergoes elastic deformation in the same direction under the opposite force. The reverse bending design of the two bending segments gives the fixing spring a bidirectional elastic support characteristic. The first contact surface 330a and the second contact surface 330b simultaneously undergo opposite displacements when subjected to force. During this process, the coordinated deformation of the first bending segment 331 and the second bending segment 332 not only disperses stress concentration but also maintains the line contact state between the first contact surface 330a and the second contact surface 330b and the inner wall of the mounting groove 1102 through curvature changes, avoiding contact failure caused by local deformation. Therefore, the retaining spring provides a uniform elastic preload during compression, ensuring the lens 300 is stably fixed in the mounting groove 1102.

[0099] In some embodiments, the fixing spring has a perforated groove 3301. The perforated groove 3301 is a perforated structure that passes through the fixing spring, used to reduce the weight of the fixing spring, while weakening the structural strength of the fixing spring on both sides of the perforated groove 3301, making this part easier to bend and generate elastic deformation. The shape of the perforated groove 3301 can be circular, elliptical, rectangular, or other suitable shapes, and the specific shape can be determined according to the overall structure and deformation requirements of the spring. Preferably, the perforated groove 3301 is elongated and is formed on the first curved section 331, and the perforated groove 3301 is located in the middle part of the first curved section 331, so that the remaining part of the first curved section 331 on both sides of the perforated groove 3301 has the same length. This design can ensure that the first curved section 331 can deform evenly under pressure, avoiding structural damage caused by stress concentration.

[0100] 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 transmissive part has a transmissive surface located at one end of its axial direction and a total reflection surface surrounding its periphery; The light-emitting part is connected to the side of the transmission part that is away from the transmission surface. A plurality of refractive protrusions are provided on the side of the part that is away from the transmission part. The refractive protrusions extend along a first direction and the plurality of refractive protrusions are arranged along a second direction. The first direction is perpendicular to the irradiated surface and the second direction is perpendicular to the first direction. The surface of the side of the plurality of refractive protrusions that is away from the light-emitting part forms a light-emitting surface that is opposite to the transmission surface.

2. The lens according to claim 1, characterized in that, The transmissive part has a recessed hole on the side opposite to the light-emitting part. The recessed hole is used to accommodate the light-emitting element of the external structure. The inner wall surface of the recessed hole on the side opposite to its opening forms the transmissive surface.

3. The lens according to claim 1, characterized in that, The transmission surface is a curved surface that bulges outward from the direction of the light-emitting part.

4. The lens according to claim 3, characterized in that, The cross-sectional shape of the transmission surface on any plane passing through the central axis of the transmission section is a first curve, and the first curve conforms to the curve function: F1(x) = P11*x^2 + P12*x + P13; Where x is the position parameter of the lens; P11∈[0.0782, 0.087]; P12∈[-0.0321, 0.0059]; P13∈[6.9067, 6.9345].

5. The lens according to claim 1, characterized in that, The total reflection surface is a curved surface that gradually expands from the transmission surface toward the light-emitting surface.

6. The lens according to claim 5, characterized in that, The cross-sectional shape of the total reflection surface on any plane passing through the central axis of the transmission section is a second curve, and the second curve conforms to the curve function: F2(x)=P21*x^3+P22*x^2+P23*x+P24; Where x is the position parameter of the lens; P21∈[0.0008, 0.0020]; P22∈[-0.0232, 0.0129]; P23∈[0.9613, 1.3087]; P24∈[-6.5827, -5.5187].

7. The lens according to any one of claims 1-6, characterized in that, The lens also includes a fixing part disposed on the transmission part and / or the light-emitting part, the fixing part being used for sliding connection with an external structure.

8. A blackboard lamp, characterized in that, include: A bracket assembly having a mounting cavity extending along the second direction, the mounting cavity having a light exit cavity opening; A plurality of lenses as described in any one of claims 1-7, wherein the lenses are slidably connected to the mounting cavity along the second direction, and the plurality of lenses are arranged along the second direction, and the light-emitting surfaces of the plurality of lenses jointly shield the light-emitting cavity opening; A light source assembly is disposed within the mounting cavity and extends along the second direction for emitting light toward the plurality of lenses.

9. The blackboard lamp according to claim 8, characterized in that, The blackboard light also includes a hanging rod connected to the bracket assembly for suspending the bracket assembly at the installation position.

10. The blackboard lamp according to claim 8, characterized in that, The blackboard light also includes a driver power supply, which is connected to the bracket assembly and electrically connected to the light source assembly, for inputting electrical energy to the light source assembly.

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