Anti-glare lenticular sheet for a classroom light

Abstract

The utility model relates to LED lighting technical field, concretely is a kind of anti-glare optical prismatic plate for classroom lamp, the anti-glare optical prismatic plate is arranged with multiple recesses, in the recess length direction, adjacent recess is staggered in perpendicular to length direction, and each recess is divided into middle section and two end portions along its length direction, this anti-glare optical prismatic plate for classroom lamp, through the prismatic plate layout design of recess adjacent up and down misplacement, changed the regularity straight path of light, effectively avoid local light superposition to form bright spot, improve the illumination uniformity, simultaneously, the two end portions of longitudinal adjacent recess form continuous longitudinal diamond grid peak, its three-dimensional staggered inclined surface structure can carry out multi-angle reflection and refraction to light, further disperse strong light, weaken glare, adapt to the visual demand of long time eye in classroom, realize the dual effect of uniform light distribution and anti-glare eye protection.

Description

Technical Field

[0001] This utility model relates to the field of LED lighting technology, specifically to an anti-glare optical prism plate for classroom lights. Background Technology

[0002] Traditional classroom lighting often uses simple prism diffuser plates, whose optical design often fails to fully consider the diverse lighting needs of classroom scenarios. These plates have limitations in anti-glare performance, making it difficult to effectively suppress glare from the blackboard area while providing sufficient and uniform diffused light to the desktop area. In addition, the surface of conventional prism plate materials is prone to static electricity accumulation, leading to dust adsorption. Long-term use will reduce the light transmittance and lighting efficiency of optical components and increase maintenance costs. Therefore, we propose an anti-glare optical prism plate for classroom lights. Utility Model Content

[0003] One of the technical problems this application aims to solve is: how to address the combined technical issues in existing classroom lighting where a single prism plate cannot provide zoned low-glare directional lighting for the blackboard and wide-angle uniform lighting for the desktop, and where the light efficiency is easily reduced due to electrostatic dust attraction.

[0004] To solve the above-mentioned technical problems, this application provides an anti-glare optical prism plate for classroom lights. The anti-glare optical prism plate has a plurality of recesses arranged on it. Each recess is divided into a middle section and two ends along its length direction, and the whole is an integrally formed structure.

[0005] The middle section of the recess is in the shape of an inverted triangular prism, and the two end faces are first inclined surfaces;

[0006] The two ends of the recess are located at the two ends of the length direction of the middle section. Each end is composed of two second inclined surfaces that are at a certain angle and are concave downward in the middle. The two second inclined surfaces are symmetrically distributed on both sides of the longitudinal central axis of the recess, and the angle between the two second inclined surfaces is in the range of 30°-60°.

[0007] In some embodiments, the anti-glare optical prism plate is divided along its length into a blackboard projection area and a desktop light-uniforming area;

[0008] The recessed portion of the blackboard projection area has a first optical characteristic and is configured to direct light rays out within a first principal emission angle range.

[0009] The recessed portion of the desktop light-diffusing area has a second optical characteristic, configured to diffuse light outwards within a second primary emission angle range, wherein the second primary emission angle is greater than the first primary emission angle.

[0010] In some embodiments, the first main emission angle ranges from 10° to 25°, and the second main emission angle ranges from 30° to 45°.

[0011] In some embodiments, the proportion of the blackboard projection area along the length of the anti-glare optical prism plate is 1 / 4 to 1 / 2.

[0012] In some embodiments, the anti-glare optical prism plate has a permanent antistatic coating that is a transparent inorganic coating with a surface resistivity of 10⁻⁶. 6 Ω / sq up to 10 9 Ω / sq.

[0013] In some embodiments, the permanent antistatic coating is applied to the surface of the prism plate by vacuum sputtering.

[0014] This utility model has at least the following beneficial effects:

[0015] 1. The design of prism plates with staggered vertical arrangement in the recessed areas changes the regular direct path of light, effectively avoiding the formation of bright spots due to local light superposition and improving the uniformity of lighting. At the same time, the two ends of the adjacent recessed areas form a continuous vertical diamond grid peak. Its three-dimensional interlaced inclined surface structure can reflect and refract light at multiple angles, further dispersing strong light and weakening glare, adapting to the visual needs of classrooms where students use their eyes for a long time, and achieving the dual effect of uniform lighting and anti-glare eye protection.

[0016] 2. By setting up a recessed section with an integrated structure of "middle section and two ends" and assigning different optical properties to different sections, precise zoned control of light is achieved. On the one hand, the blackboard projection area can direct the light out at a small angle, effectively improving the blackboard illuminance and significantly suppressing direct glare and indirect reflection on teachers and students. On the other hand, the desktop light uniform area diffuses the light out at a large angle, providing a uniform, soft and comfortable light environment for the learning area below.

[0017] Meanwhile, by applying a permanent anti-static coating to the surface, the problem of reduced light transmittance and frequent maintenance caused by static dust attraction in traditional prism plates is fundamentally solved, ensuring the long-term stable optical performance and service life of the lamps, thereby optimizing the visual comfort, energy efficiency and practicality of classroom lighting as a whole. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the anti-glare optical prism plate of this utility model;

[0019] Figure 2 This is a top view schematic diagram of the anti-glare optical prism plate of this utility model;

[0020] Figure 3 This is a schematic diagram of the blackboard projection area and the desktop light uniform area of ​​this utility model.

[0021] In the diagram: 1-Anti-glare optical prism plate; 2-Recessed part; 3-Middle section; 4-Both ends; 5-First inclined surface; 6-Second inclined surface; 7-Blackboard projection area; 8-Desktop light uniformity area. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1, please refer to Figures 1-2 As shown, the anti-glare optical prism plate 1 has a plurality of recesses 2 arranged on it. In the length direction of the recesses 2, adjacent recesses 2 are staggered in the direction perpendicular to the length.

[0024] Each of the recesses 2 is divided into a middle section 3 and two end sections 4 along its length, and the whole is an integral molded structure;

[0025] The middle section 3 of the recessed portion 2 is in the shape of an inverted triangular prism, and the two end faces are first inclined surfaces 5;

[0026] The two ends 4 of the recessed portion 2 are located at the two ends of the length of the middle section, and each end is composed of two second inclined surfaces 6 that are at a certain angle and concave downward in the middle. The two second inclined surfaces 6 are symmetrically distributed on both sides of the longitudinal central axis of the recessed portion 2, as shown in the attached figure. Figure 1 As shown, continuous longitudinal diamond-shaped peaks are formed at the two ends 4 of adjacent recesses 2 in the longitudinal direction, which can further soften the direct angle of strong light, making the anti-glare effect better. Moreover, such a continuous concave-convex structure can further expand the lighting range and disperse the light source, reducing the concentration of light in a small area.

[0027] In addition, the included angle between the two second inclined planes 6 ranges from 30° to 60°.

[0028] Regarding the above features, the middle section 3 of the inverted triangular prism shape is a typical prism refraction / reflection unit, used to control the direction of light, to deflect obliquely incident light to the desired direction, to avoid direct exposure to the human eye, and to effectively prevent glare.

[0029] The two ends 4 are located at both ends of the middle section 3 and are composed of two symmetrical second inclined surfaces 6, which are concave downward in the middle with an included angle of 30°–60°. This is equivalent to adding a lateral diffusion or light-gathering structure at both ends in the length direction. This can change the distribution characteristics of light along the length direction of the prism. It is precisely because of the design of the two second inclined surfaces 6 that the middle section 3 prism controls the incident light along the vertical direction of the prism length in the longitudinal direction, while the structures at both ends 4 control the incident light along the parallel or oblique direction of the prism length in the lateral direction. This forms a two-dimensional anti-glare coverage, expands the effective angle range, and solves the problem of uneven brightness caused by light gathering or dissipation at both ends of the traditional long strip prism. It achieves two-dimensional wide-angle anti-glare and uniform brightness.

[0030] Example 2, please refer to the appendix. Figure 3 As shown, this embodiment provides an optimized technical solution based on embodiment 1: especially at the LED light near the top of the podium in the classroom, the anti-glare optical prism plate 1 is divided into a blackboard projection area 7 and a desktop uniform light area 8 along its length. With this design, it is possible to meet the different needs of the blackboard area and the seating area in the classroom through an asymmetrical optical structure. For example, the prism angle on the side closer to the blackboard is steeper, so that more light is directed to the blackboard, while the prism above the seating area ensures uniform illuminance on the desktop, thereby more flexibly meeting the lighting needs.

[0031] The recessed portion 2 of the blackboard projection area 7 has a first optical characteristic and is configured to direct light rays out within a first main emission angle range.

[0032] The recessed portion 2 of the desktop light-diffusing area 8 has a second optical characteristic, configured to diffuse light outwards within a second main emission angle range, the second main emission angle being greater than the first main emission angle, and the proportion of the blackboard projection area 7 along the length direction of the anti-glare optical prism plate 1 being 1 / 4 to 1 / 2.

[0033] The first main emission angle ranges from 10° to 25°, according to the beam control equation:

[0034]

[0035] Using a large-aperture prism (aperture angle α = 100°-120°), the tilt angle is optimized through non-sequential ray tracing to make the light converge towards the normal direction. By adjusting the prism aperture angle α, the Lambertian distribution of the LED light source (±60°) is compressed to within ±15°. This asymmetric prism arrangement forms a skewed distribution, with the peak light intensity appearing in the 15°-20° direction, precisely aligned with the center area of ​​the blackboard. This narrow beam ensures that students' line of sight (usually upward <30°) hardly enters the main beam area, with a measured UGR <13. The beam is incident on the blackboard at 15°-20°, and the reflected light is mainly upward, avoiding the eye height of the teacher when standing (approximately 1.7m). By fine-tuning the prism angle at different positions, the upper part of the blackboard (at greater distance) receives relatively more light intensity, compensating for distance attenuation and achieving uniform illumination across the entire blackboard.

[0036] The second main emission angle ranges from 30° to 45°. Combined with the inverted prism and microlens array, and with the second tilted surface angle γ = 40°-50°, it forms a two-dimensional diffusion. Its light diffusion model is as follows:

[0037]

[0038] Where FWHM is the full width at half maximum (FWHM) of the beam, and n is the refractive index of the material. The design aims to achieve an FWHM of 60°-90°. Furthermore, the wide-angle light rays create multiple superpositions on the tabletop, and according to the illuminance distribution function:

[0039]

[0040] By optimizing the I(θ) distribution, E can be made h (x) fluctuates by <±15% in the desktop area.

[0041] With a main emission angle of 30°-45° and diffusion, this lighting achieves an ideal ratio of illumination radius to height (R / H≈1.2). A single lamp can cover 3-4 rows of desks. Ultimately, the wide beam multi-angle illumination blurs the edges of shadows, effectively reducing visual fatigue. The brightness transition from under the lamp to between the lamps is natural, with no obvious light-dark boundary, ensuring visual comfort. It also provides appropriate vertical illuminance (wall illuminance of about 100-150 lx), thereby enhancing the brightness of the space while avoiding the oppressive feeling caused by an overly bright ceiling.

[0042] Furthermore, the surface of the anti-glare optical prism plate 1 is provided with a permanent antistatic coating, which is a transparent inorganic coating with a surface resistivity of 10. 6 Ω / sq up to 10 9 Ω / sq.

[0043] The permanent antistatic coating is applied to the surface of the prism plate by vacuum sputtering.

[0044] Since static electricity is the main cause of attracting dust and particles in the air, this problem can be fundamentally solved by adding a permanent antistatic coating. This can keep the surface clean for a long time, reduce the frequency of cleaning, and the transparent inorganic coating itself absorbs very little visible light. It will not change the original light transmittance, color and clarity of the prism plate, thus ensuring the most basic requirements of light.

[0045] Moreover, by employing vacuum sputtering film-forming technology, a uniform and shape-preserving thin film can be formed on the surface of complex three-dimensional microstructures, completely covering the concave and convex surfaces of each prism without changing its morphology, ensuring that the anti-static function is not sacrificed at the expense of the anti-glare effect.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. An anti-glare optical prism plate for classroom lights, characterized in that: The anti-glare optical prism plate has a plurality of recesses arranged thereon. In the length direction of the recesses, adjacent recesses are staggered in the direction perpendicular to the length direction, and each recess is divided into a middle section and two ends along its length direction. The middle section of the recess is in the shape of an inverted triangular prism, and the two end faces are first inclined surfaces; The two ends of the recess are located at the two ends of the length direction of the middle section. Each end is composed of two second inclined surfaces that are at a certain angle and are concave downward in the middle. The two second inclined surfaces are symmetrically distributed on both sides of the longitudinal central axis of the recess.

2. The anti-glare optical prism plate for classroom lights according to claim 1, characterized in that: The included angle between the two second inclined planes ranges from 30° to 60°.

3. The anti-glare optical prism plate for classroom lights according to claim 1, characterized in that: The anti-glare optical prism plate is divided into a blackboard projection area and a desktop light uniformity area along its length. The recessed portion of the blackboard projection area has a first optical characteristic and is configured to direct light rays out within a first principal emission angle range. The recessed portion of the desktop light-diffusing area has a second optical characteristic, configured to diffuse light outwards within a second primary emission angle range, wherein the second primary emission angle is greater than the first primary emission angle.

4. The anti-glare optical prism plate for classroom lights according to claim 3, characterized in that: The first main emission angle ranges from 10° to 25°, and the second main emission angle ranges from 30° to 45°.

5. The anti-glare optical prism plate for classroom lights according to claim 4, characterized in that: The proportion of the blackboard projection area along the length of the anti-glare optical prism plate is 1 / 4 to 1 / 2.

6. The anti-glare optical prism plate for classroom lights according to claim 1, characterized in that: The surface of the anti-glare optical prism plate is provided with a permanent antistatic coating, which is a transparent inorganic coating with a surface resistivity of 10. 6 Ω / sq up to 10 9 Ω / sq.

7. The anti-glare optical prism plate for classroom lights according to claim 6, characterized in that: The permanent antistatic coating is applied to the surface of the prism plate by vacuum sputtering.

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