Blackboard lamp

Abstract

The utility model discloses a blackboard lamp, which belongs to the technical field of lamp equipment and comprises a diffusion plate, a honeycomb grid, an optical lens and a light source component which are sequentially arranged from bottom to top. The optical lens comprises a refraction part and a light-transmitting flat plate part; the refraction part extends along the length direction of the light-transmitting flat plate part; the irradiation end of the light source assembly faces the refraction part; irregular light rays can enter the honeycomb grid at a specified incident angle after being rectified through the light source lens, then the irradiation range of the light rays can be effectively controlled through multiple times of reflection of the honeycomb grid, compared with an existing blackboard lamp, the emergent angle of the light rays can be controlled, the light rays are prevented from directly irradiating human eyes, and the brightness of the blackboard lamp is improved. According to the anti-dazzle blackboard, the light can be emitted to cause dizziness and poor experience, the working effect is affected, the emitted light is softer under the cooperation of the diffusion plate, the light can be evenly irradiated on the blackboard, and the effects of deeply preventing dazzle and improving the illumination uniformity are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lamp equipment, in particular to a blackboard lamp. Background Art

[0002] The blackboard is an indispensable facility for offline teaching. In order to ensure that students can see the contents on the blackboard more clearly, it is usually necessary to install a blackboard lamp diagonally above the blackboard to improve the overall lighting.

[0003] However, part of the light emitted by the existing blackboard lamps can easily hit the human eyes directly, causing glare. In order to avoid serious interference glare, teachers generally reduce direct glare by adjusting the original installation angle of the blackboard lamp. However, since the blackboard lamp is closer to the top of the blackboard and farther from the bottom of the blackboard, the illumination of the blackboard surface from top to bottom gradually decays. If the adjustment angle cannot be well controlled, the illumination and uniformity of the blackboard lamp will change and fail to meet the requirements of the current national standards, thereby affecting the teaching effect. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to provide a blackboard lamp which can prevent glare and improve lighting uniformity.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A blackboard lamp comprises a diffusion plate, a honeycomb grid, an optical lens and a light source assembly which are arranged in sequence from bottom to top;

[0007] The optical lens comprises a refractive portion and a light-transmitting flat plate portion;

[0008] The refraction portion extends along the length direction of the light-transmitting flat plate portion;

[0009] The irradiation end of the light source assembly is arranged toward the refraction portion.

[0010] Furthermore, the diffusion plate includes a substrate and diffusion particles arranged inside the substrate.

[0011] Further, the honeycomb grid comprises hexagonal frames arranged in a dot matrix;

[0012] The outer side wall of each hexagonal enclosure is in close contact with the outer side wall of the connected hexagonal enclosure;

[0013] The hexagonal frame forms a light path channel;

[0014] The plane where the diffusion plate is located and the plane where the light-transmitting flat plate portion is located are both perpendicular to the extension direction of the light path channel.

[0015] Furthermore, the inner wall of the hexagonal frame is a smooth surface.

[0016] Furthermore, a reflective layer is provided on the inner wall of the hexagonal frame.

[0017] Furthermore, one end of the diffusion plate adjacent to the honeycomb grid and one end of the light-transmitting flat plate adjacent to the honeycomb grid are both provided with a hexagonal slot corresponding to the end face of the hexagonal frame;

[0018] The two ends of the hexagonal frame are respectively inserted into corresponding hexagonal slots.

[0019] Furthermore, the refraction portion and the light-transmitting flat plate portion are an integrated structure;

[0020] The refraction portion is provided with a groove-shaped structure recessed toward the light-transmitting flat plate portion;

[0021] Both side walls of the groove-shaped structure are provided with sawtooth-shaped refractive surfaces;

[0022] A polarizing surface is arranged at the bottom of the groove-shaped structure.

[0023] Furthermore, the light source assembly includes a support plate and at least three lamp beads;

[0024] The lamp beads are evenly distributed on the support plate along the length direction of the support plate;

[0025] The vertical projections of the lamp beads are all located on the bottom of the groove structure;

[0026] The irradiation end of the lamp bead is arranged toward the bottom of the groove structure.

[0027] Furthermore, it also includes a housing;

[0028] The diffusion plate, honeycomb grid, optical lens and light source assembly are all clamped inside the shell.

[0029] Furthermore, the cross section of the refraction portion is an isosceles trapezoid;

[0030] The long base of the isosceles trapezoid is connected to the light-transmitting flat plate portion;

[0031] The irradiation end of the light source assembly is arranged toward the short bottom side of the isosceles trapezoid;

[0032] The light source assembly is located within the vertical projection range of the refraction portion.

[0033] The beneficial effect of the utility model is that the blackboard lamp provided by the utility model can enter the honeycomb mesh grille at a specified incident angle after the irregular light emitted by the light source assembly is corrected by the refractive part of the light source lens, and then through multiple mirror reflections of the honeycomb mesh grille, the irradiation range of the light can be effectively controlled. At the same time, with the cooperation of the diffusion plate, the effect of deep anti-glare and improved illumination uniformity can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Shown is an exploded view of a blackboard lamp according to a specific embodiment of the utility model;

[0035] Figure 2 Shown is a working schematic diagram of a blackboard lamp according to a specific embodiment of the utility model;

[0036] Figure 3 Shown is a schematic structural diagram of a honeycomb grid according to a specific embodiment of the utility model;

[0037] Figure 4 Shown Figure 3 A magnified view of point A;

[0038] Figure 5 Shown is a spectrum curve diagram of a blackboard lamp according to a specific embodiment of the utility model and a traditional blackboard lamp;

[0039] Figure 6 Shown is a diagram of vertical illumination uniformity of a blackboard using a blackboard lamp according to a specific embodiment of the utility model;

[0040] Description of labels:

[0041] 1. Diffuser plate;

[0042] 2. Honeycomb grid; 21. Hexagonal frame; 22. Light path channel;

[0043] 3. optical lens; 31. refractive part; 311. refractive surface; 312. polarizing surface; 32. light-transmitting flat plate part;

[0044] 4. Light source assembly; 41. Support plate; 42. Lamp beads;

[0045] 5. Light. DETAILED DESCRIPTION

[0046] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0047] The most critical concept of the utility model is that after the irregular light emitted by the light source assembly is corrected by the refractive part of the light source lens, it can enter the honeycomb mesh grille at a specified incident angle, and then through multiple mirror reflections of the honeycomb mesh grille, the irradiation range of the light can be effectively controlled. At the same time, with the cooperation of the diffusion plate, it can achieve the effect of deep anti-glare and improved illumination uniformity.

[0048] Please refer to Figures 1 to 4 The blackboard lamp provided by the utility model comprises a diffusion plate 1, a honeycomb grid 2, an optical lens 3 and a light source assembly 4 which are arranged in sequence from bottom to top;

[0049] The optical lens 3 includes a refractive portion 31 and a light-transmitting flat plate portion 32;

[0050] The refraction portion 31 extends along the length direction of the light-transmitting flat plate portion 32;

[0051] The irradiation end of the light source assembly 4 is disposed toward the refracting portion 31 .

[0052] Specifically, in actual use, the diffusion plate is located at the bottom of the blackboard lamp, that is, the distance between the diffusion plate and the blackboard is the shortest, so that the light can be evenly projected onto the blackboard.

[0053] From the above description, it can be seen that the beneficial effect of the utility model is that it provides a blackboard lamp, which can enter the honeycomb mesh grille 2 at a specified incident angle after the irregular light emitted by the light source assembly 4 is corrected by the refractive portion 31 of the light source lens, and then through multiple mirror reflections of the honeycomb mesh grille 2, the irradiation range of the light can be effectively controlled. Compared with the existing blackboard lamps, it can avoid the light from directly entering the human eyes, thereby causing dizziness and poor experience to the user during use, and affecting the working effect; at the same time, with the cooperation of the diffuser 1, it can further achieve deep anti-glare and improve the uniformity of illumination.

[0054] Furthermore, the diffusion plate 1 includes a substrate and diffusion particles arranged inside the substrate.

[0055] Specifically, it can be selected whether to add diffusion particles inside the substrate according to actual needs. In the case where diffusion particles are not added, the diffusion plate 1 is transparent, and this type of diffusion plate 1 can effectively improve the utilization rate of light. Preferably, the material of the substrate can be plastic such as polystyrene (PS), polycarbonate (PC), polymethacrylic acid (PMMA), etc.; the material of the diffusion particles can be plastic particles or metal particles, etc.

[0056] From the above description, it can be seen that the design makes specific improvements to the structure of the diffuser plate 1 by arranging randomly distributed diffuser particles inside the substrate of the diffuser plate 1 so that the diffuser particles can randomly refract light, thereby effectively improving the uniformity of light.

[0057] Further, the honeycomb grid 2 includes hexagonal frames 21 arranged in a dot matrix;

[0058] The outer side wall of each hexagonal frame 21 is in close contact with the outer side wall of the connected hexagonal frame 21;

[0059] The hexagonal frame 21 forms an optical path channel 22;

[0060] The plane where the diffuser plate 1 is located and the plane where the light-transmitting flat plate portion 32 is located are both perpendicular to the extension direction of the light path channel 22 .

[0061] Furthermore, the inner wall of the hexagonal frame 21 is a smooth surface.

[0062] Specifically, the material of the hexagonal frame 21 can be metal with a smooth surface. This design can not only improve the reflection effect of the honeycomb mesh grille 2, but the metal honeycomb mesh grille 2 can also indirectly improve the heat dissipation capacity of the lamp, avoiding an increase in fire risk due to excessively high operating temperature.

[0063] Furthermore, a reflective layer is provided on the inner wall of the hexagonal frame 21 .

[0064] As can be seen from the above description, the design has made specific improvements to the structure of the honeycomb mesh grille 2. The honeycomb mesh grille 2 composed of the hexagonal frame 21 can not only improve the overall stability, but also increase the corresponding radiation surface in a limited area, thereby avoiding glare caused by direct radiation; ensuring that the outer wall of each hexagonal frame 21 is in close contact with the outer wall of the connected hexagonal frame 21, so that all light can be reflected multiple times through the inner wall of the hexagonal frame 21, avoiding the final lighting effect of the lamp due to the escape of some light; and further optimizing the inner wall of the hexagonal frame 21. By improving the smoothness of the inner wall of the hexagonal frame 21, the generation of diffuse reflection can be reduced, thereby improving the utilization efficiency of light energy.

[0065] Furthermore, one end of the diffusion plate 1 adjacent to the honeycomb mesh grille 2 and one end of the light-transmitting flat plate portion 32 adjacent to the honeycomb mesh grille 2 are both provided with a hexagonal slot corresponding to the end face of the hexagonal surrounding frame 21;

[0066] Two ends of the hexagonal frame 21 are respectively inserted into corresponding hexagonal slots.

[0067] It can be seen from the above description that through the cooperation between the hexagonal frame 21 and the hexagonal slots, the blackboard lamp can stably fix the honeycomb mesh grille 2 between the diffuser plate 1 and the optical lens 3 after assembly; the setting of the hexagonal slots can not only effectively limit the freedom of the honeycomb mesh grille 2, and prevent the honeycomb mesh grille 2 from affecting the reflection effect of light due to lateral movement, but also can indirectly improve the overall assembly efficiency while enabling the user to quickly and accurately fix the honeycomb mesh grille 2 at a preset position, thereby ensuring the final light output effect.

[0068] Furthermore, the refraction portion 31 and the light-transmitting flat plate portion 32 are an integrated structure;

[0069] The refraction portion 31 is provided with a groove-shaped structure which is recessed toward the light-transmitting flat plate portion 32;

[0070] Both side walls of the groove-shaped structure are provided with sawtooth-shaped refractive surfaces 311;

[0071] A polarizing surface 312 is disposed at the bottom of the groove-shaped structure.

[0072] Specifically, the outer wall of the refractive portion 31 is a TIR optical surface (Total Internal Reflection), and the refractive surfaces 311 of the two side walls of the groove structure and the polarizing surface 312 of the groove bottom constitute a Fresnel surface; compared with an ordinary lens, a lens using a Fresnel surface can compress the thickness of the lens to a greater extent without changing the refractive power of the lens, thereby providing structural support for the blackboard lamp to achieve a sophisticated design, and by making the outer wall of the refractive portion 31 a TIR optical surface, all irregular light can be corrected into parallel light with a small angle, and then formed into a light beam at a specific angle through the multi-layer anti-glare control of the surface honeycomb grille and the diffusion plate 1, thereby improving the directional light control ability of the blackboard lamp, making the light spot softer, and at the same time, it can also relatively reduce the contribution of the controllable light to the background light, thereby weakening the background light of the entire light spot.

[0073] As can be seen from the above description, the design improves the refractive portion 31 into a concave groove structure based on the Fresnel lens. The serrated refractive surfaces 311 on the two side walls of the groove structure can make the light enter the honeycomb mesh grille 2 in the state of small-angle parallel light, thereby achieving the effect of regularizing the light; and before production and processing, the setting angle of the polarizing plane 312 is predetermined according to actual lighting needs, which can ensure that a part of the light automatically enters in the direction of the blackboard after passing through the polarizing plane 312, thereby achieving the purpose of cross-light distribution, so that the irradiation range of the light can be distributed respectively on the upper, middle and lower positions of the blackboard, and then the cooperation between the honeycomb mesh grille 2 and the diffuser plate 1 can achieve the effect of deep anti-glare and uniform lighting.

[0074] Furthermore, the light source assembly 4 includes a support plate 41 and at least three lamp beads 42;

[0075] Along the length direction of the support plate 41, the lamp beads 42 are evenly distributed on the support plate 41;

[0076] The vertical projections of the lamp beads 42 are all located on the bottom of the groove structure;

[0077] The irradiation end of the lamp bead 42 is arranged toward the bottom of the groove structure.

[0078] From the above description, it can be seen that the design has made specific improvements to the component structure of the light source component 4, so as to ensure that the light can be evenly irradiated on the optical lens 3, thereby ensuring that the final emitted light can be evenly hit on the blackboard, thereby improving the overall lighting effect.

[0079] Furthermore, the above-mentioned blackboard lamp also includes a housing;

[0080] The diffusion plate 1, the honeycomb grid 2, the optical lens 3 and the light source assembly 4 are all clamped inside the housing.

[0081] From the above description, it can be seen that the shell can effectively fix the various components of the blackboard lamp to avoid offset between the structures due to shaking during use, thereby affecting the final lighting effect; at the same time, it can also play a certain protective role on the internal structure, thereby indirectly improving the service life of the blackboard lamp.

[0082] Furthermore, the cross section of the refraction portion 31 is an isosceles trapezoid;

[0083] The long base of the isosceles trapezoid is connected to the light-transmitting flat plate portion 32;

[0084] The irradiation end of the light source assembly 4 is arranged toward the short bottom side of the isosceles trapezoid;

[0085] The light source assembly 4 is located within the vertical projection range of the refraction portion 31 .

[0086] Furthermore, the cross section of the refraction portion 31 is an isosceles trapezoidal structure;

[0087] The two waist sides of the structure are arcs;

[0088] The included angle between the axis of the optical path channel 22 and the tangent of the arc is 35° to 40°, that is, Figure 2 Preferably, the angle between the axis of the optical path channel 22 and the tangent of the arc can be 35°, 36°, 37°, 38°, 39° or 40°.

[0089] From the above description, it can be seen that by ensuring that the light source assembly 4 can be completely located within the vertical projection range of the refractive portion 31, the irregular light emitted by the light source assembly 4 can be completely incident on the optical lens 3, so that the optical lens 3 can complete the work of correcting the light and make the light emitted at a specified angle, thereby effectively avoiding glare caused by the escape of part of the light during use.

[0090] The blackboard lamp of the utility model can be used to improve the lighting conditions of the blackboard and daily lighting work.

[0091] Please refer to Figures 1 to 4 , Embodiment 1 of the present utility model is:

[0092] A blackboard lamp comprises a shell (not shown in the figure), and a diffusion plate 1, a honeycomb grid 2, an optical lens 3 and a light source assembly 4 which are sequentially clamped inside the shell from bottom to top; the optical lens 3 comprises a refraction portion 31 and a light-transmitting flat plate portion 32; the refraction portion 31 extends along the length direction of the light-transmitting flat plate portion 32; the irradiation end of the light source assembly 4 is arranged toward the refraction portion 31; the diffusion plate 1 comprises a substrate (not shown in the figure) and diffusion particles (not shown in the figure) arranged inside the substrate.

[0093] The honeycomb grid 2 includes hexagonal frames 21 arranged in a dot matrix; the outer wall of each hexagonal frame 21 is in close contact with the outer wall of the connected hexagonal frame 21; the hexagonal frames 21 constitute an optical path channel 22; the plane where the diffuser plate 1 is located and the plane where the light-transmitting flat plate portion 32 is located are both perpendicular to the extension direction of the optical path channel 22; the inner wall of the hexagonal frame 21 is a smooth surface; the inner wall of the hexagonal frame 21 is provided with a reflective layer (not shown in the figure).

[0094] One end of the diffusion plate 1 adjacent to the honeycomb mesh grille 2 and one end of the light-transmitting flat plate portion 32 adjacent to the honeycomb mesh grille 2 are both provided with hexagonal slots (not shown in the figure) corresponding to the end faces of the hexagonal frame 21; the two ends of the hexagonal frame 21 are respectively inserted into the corresponding hexagonal slots.

[0095] The refraction part 31 and the transparent flat plate part 32 are an integral structure; the refraction part 31 is provided with a groove structure recessed toward the transparent flat plate part 32; both side walls of the groove structure are provided with sawtooth refraction surfaces 311; and the bottom of the groove structure is provided with a polarization surface 312.

[0096] The light source assembly 4 includes a support plate 41 and ten lamp beads 42; the lamp beads 42 are evenly distributed on the support plate 41 along the length direction of the support plate 41; the vertical projections of the lamp beads 42 are all located on the bottom of the groove structure; the irradiation end of the lamp bead 42 is arranged toward the bottom of the groove structure.

[0097] The cross-section of the refraction portion 31 is a structure similar to an isosceles trapezoid; the two waist sides of the structure are arcs; the long base of the isosceles trapezoid is connected to the light-transmitting flat plate portion 32; the irradiation end of the light source assembly 4 is arranged toward the short base of the isosceles trapezoid; the light source assembly 4 is located within the vertical projection range of the refraction portion 31; the angle between the axis of the light path channel 22 and the tangent of the arc is 36°.

[0098] The working principle of the utility model is as follows: light is emitted from the light source assembly 4 to the groove structure of the optical lens 3, a part of the light is corrected by the refractive surface 311 and the TIR optical surface of the outer wall of the refractive portion 31, and then enters the honeycomb mesh grille 2 in the form of small-angle parallel light, and another part of the light is deflected and refracted into the honeycomb mesh grille 2 after being acted upon by the polarizing surface 312; after these two parts of light are reflected multiple times by the inner wall of the hexagonal frame 21, the emission angles can be shrunk to a certain extent, thereby achieving an anti-glare effect; and the light with a specific emission angle after shrinkage can achieve the purpose of uniform light under the action of the diffusion plate 1, so that the light can be softly hit on the upper, middle and lower positions of the blackboard.

[0099] Please refer to Figure 5 and Figure 6 The difference between the second embodiment of the present invention and the first embodiment is that:

[0100] On the basis of the blackboard lamp of Example 1, in order to control the blue light hazard, the spectrum of the light source component 4 is modulated, curve A is the blue light hazard curve, curve B is the spectrum curve of ordinary LED, and curve C is the spectrum curve of Example 2 of this application. Compared with the spectrum curve of the traditional ordinary Ra90 blackboard lamp and the spectrum curve of the ordinary Ra95 blackboard lamp (the horizontal axis is the wavelength nm, and the vertical axis is the relative spectrum value), the peak point of the blackboard lamp of this application is much shifted to the right relative to the peak point of the ordinary blackboard lamp, and is already in the red light wavelength region. The proportion of blue light is even less, which significantly reduces the blue light hazard. In the spectrum of the anti-blue light blackboard lamp provided in Example 2 of this application, the peak wavelength is greater than or equal to 630nm, and the half-wave width is less than or equal to 10nm. Compared with ordinary blackboard lamps, the blue light hazard can be reduced by at least 40%. The specific comparison table is as follows:

[0101] Dominant wavelength(nm) Peak wavelength (nm) Half-wave peak width (nm) Ra R9 R15 The utility model scheme 573.3 630.6 7.6 95 80 95 Ordinary Ra90 blackboard light 567.1 453.9 23.1 97.8 98 96 Ordinary Ra95 blackboard light 565.0 451.5 25.1 91.0 57 87

[0102] The IES file of the light distribution curve of the second embodiment of the present application is imported into the Dialux file, and a simulation is performed in a standard classroom space (4×1.2m blackboard surface), and the vertical illuminance uniformity of the blackboard surface is finally obtained, which also meets the requirements of national standards. For details, refer to Figure 6 .

[0103] To sum up, the utility model provides a blackboard lamp, which can enter the honeycomb mesh grille at a specified incident angle after the irregular light emitted by the light source assembly is corrected by the refractive part of the light source lens, and then through multiple mirror reflections of the honeycomb mesh grille, it can effectively control the irradiation range of the light. Compared with the existing blackboard lamps, it can not only control the emission angle of the light to avoid the light directly entering the human eyes, thereby causing dizziness and poor experience to the user during use and affecting the work effect, but also can make the emitted light softer and make the light evenly hit the blackboard in cooperation with the diffusion plate, so as to achieve the effect of deep anti-glare and improve the uniformity of illumination.

[0104] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A blackboard lamp, characterized in that: It includes a diffusion plate, a honeycomb grid, an optical lens and a light source assembly which are arranged in sequence from bottom to top; The optical lens comprises a refractive portion and a light-transmitting flat plate portion; The refraction portion extends along the length direction of the light-transmitting flat plate portion; The irradiation end of the light source assembly is arranged toward the refraction portion.

2. The blackboard lamp according to claim 1, characterized in that: The diffusion plate includes a substrate and diffusion particles arranged inside the substrate.

3. The blackboard lamp according to claim 1, characterized in that: The honeycomb grid includes hexagonal frames arranged in a dot matrix; The outer side wall of each hexagonal enclosure is in close contact with the outer side wall of the connected hexagonal enclosure; The hexagonal frame forms a light path channel; The plane where the diffusion plate is located and the plane where the light-transmitting flat plate portion is located are both perpendicular to the extension direction of the light path channel.

4. The blackboard lamp according to claim 3, characterized in that: The inner wall of the hexagonal frame is a smooth surface.

5. The blackboard lamp according to claim 3, characterized in that: The inner wall of the hexagonal frame is provided with a reflective layer.

6. The blackboard lamp according to claim 3, characterized in that: The end of the diffusion plate adjacent to the honeycomb grid and the end of the light-transmitting flat plate adjacent to the honeycomb grid are both provided with a hexagonal slot corresponding to the end face of the hexagonal frame; The two ends of the hexagonal frame are respectively inserted into corresponding hexagonal slots.

7. The blackboard lamp according to claim 1, characterized in that: The refraction part and the light-transmitting flat plate part are an integrated structure; The refraction portion is provided with a groove-shaped structure recessed toward the light-transmitting flat plate portion; Both side walls of the groove-shaped structure are provided with sawtooth-shaped refractive surfaces; A polarizing surface is arranged at the bottom of the groove-shaped structure.

8. The blackboard lamp according to claim 7, characterized in that: The light source assembly includes a support plate and at least three lamp beads; The lamp beads are evenly distributed on the support plate along the length direction of the support plate; The vertical projections of the lamp beads are all located on the bottom of the groove structure; The irradiation ends of the lamp beads are all arranged toward the bottom of the groove structure.

9. The blackboard lamp according to claim 1, characterized in that: Also includes a housing; The diffusion plate, honeycomb grid, optical lens and light source assembly are all clamped inside the shell.

10. The blackboard lamp according to claim 1, characterized in that: The cross section of the refractive portion is an isosceles trapezoid; The long base of the isosceles trapezoid is connected to the light-transmitting flat plate portion; The irradiation end of the light source assembly is arranged toward the short bottom side of the isosceles trapezoid; The light source assembly is located within the vertical projection range of the refraction portion.

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