Anti-dazzle blackboard lamp lens for classroom illumination
By designing an anti-glare blackboard lamp lens for classroom lighting, and utilizing a combination of a light source cavity, a reflective surface, and an exit prism, the problems of glare and uneven light distribution in blackboard lamps were solved, achieving uniform illumination and efficient light utilization for the blackboard.
Patent Information
- Application Number
- CN202422997169.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-05
AI Technical Summary
Traditional blackboard lights suffer from glare and low light utilization, and existing lenses cannot effectively solve the problems of uneven light source illumination and glare.
Design a blackboard light lens for classroom lighting that prevents glare. It adopts a combination structure of light source cavity, first reflective surface, second reflective surface, emission surface and emission prism. Through the reflection and refraction of light, it ensures that the light is evenly irradiated on the blackboard and avoids glare.
It achieves uniformity of blackboard brightness and illuminance, avoids glare and visual fatigue, improves light utilization, and reduces light source loss and color drift.
Smart Images
Figure CN223525020U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to lens technical field, concretely is classroom lighting anti -dazzle blackboard lamp lens. BACKGROUND
[0002] In the classroom, the blackboard lamp passes through increasing the brightness of blackboard, and the teacher writes and student clearly reads the content on the blackboard.
[0003] The lamp for illuminating the blackboard 10 of tradition is common fluorescent tube, the light of fluorescent tube 30 emits and carries out diffuse reflection along the circumference direction of lamp tube, as shown in Figure 1 The student's eye 20 is irradiated, causes serious glare, and causes serious visual fatigue, because the illumination angle of light is bigger, therefore, light source utilization rate is lower, the lens that appears on the market currently can reflect the light of light source to the blackboard for illumination, as shown in Figure 2 But, light source 30 sets up on the lens, this kind of lens can only control the irradiation area through two different reflection surfaces, the brightness of blackboard 10, the non-uniformity of illumination, and part of light still irradiates to the human eye 20, also can cause certain degree of glare, and causes visual fatigue and light waste.
[0004] Therefore, the current urgent need for a new technical scheme to solve the above technical problems. CONTENT OF THE UTILITY MODEL
[0005] The utility model aims at providing a classroom lighting anti -dazzle blackboard lamp lens, in order to solve above -mentioned technical problem, the utility model adopts the following technical scheme:
[0006] A classroom lighting anti -dazzle blackboard lamp lens, including one body, the body is provided with
[0007] Light source cavity, the light source cavity is shaped on the top of the body, and the inner wall of the light source cavity forms the incident surface for light to pass through;
[0008] First reflection surface, the first reflection surface includes two that are arranged in the two sides of the light source cavity, and gradually extends respectively from the two sides of the light source cavity opening edge respectively towards the downside;
[0009] Second reflection surface, the second reflection surface is located in the downside of one of the first reflection surface, and meets the light source cavity, and the normal direction of the second reflection surface and the bottom of the light source cavity orthographic projection is 45 degrees angle;
[0010] An exit surface is arranged on the side corresponding to the second reflecting surface, and the lower end of the exit surface is connected to the lower end of the second reflecting surface.
[0011] Further, the exit surface and the second reflecting surface define a 45° angle.
[0012] Further, each of the reflecting surfaces is arranged at the same inclination as the second reflecting surface, and the angle between each of the reflecting surfaces and the normal of the orthographic projection of the light source cavity bottom gradually decreases from the upper end to the lower end of the exit surface.
[0013] Further, the connecting surface is perpendicular to the normal of the orthographic projection of the light source cavity bottom.
[0014] Further, the second reflecting surface is provided with a plurality of reflecting prisms arranged side by side from the front end to the rear end, and the reflecting prisms have two reflecting surfaces adjacent to each other.
[0015] Further, the angle between the two reflecting surfaces of each of the reflecting prisms is 90°.
[0016] Further, the body is provided with a connecting portion formed on both sides of the body and separating the first reflecting surface and the second reflecting surface, and the first reflecting surface and the reflecting surface.
[0017] Further, the bottom of the light source cavity is provided as an outwardly convex arc surface, and the incident surface formed by the other two side walls of the light source cavity is provided as a plane.
[0018] The beneficial effects of the present application are as follows:
[0019] The embodiment of the utility model provides a kind of lens, to be used on blackboard lamp, LED light source is installed in the light source cavity of the lens provided in this embodiment, light enters into the body along incident plane, and light is reflected towards the direction of exit surface by second reflecting surface, at this time, the light scattered by second reflecting surface is shot towards the direction of blackboard by the exit prism arranged on reflecting surface, and light is scattered by the exit surface on exit prism, can be evenly irradiated on blackboard, guarantee the uniformity of brightness on blackboard, simultaneously, by second reflecting surface, light towards student eye is refracted towards the direction of exit surface, to be able to refract the light of light source towards student direction, avoid glare after light irradiation to human eye and visual fatigue after long-term irradiation. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is a structure schematic diagram of the structure for illuminating relying on fluorescent tube in the background technology of the utility model.
[0021] Figure 2 It is a structure schematic diagram of the structure for illuminating relying on fluorescent tube in the background technology of the utility model.
[0022] Figure 3 It is a structure schematic diagram of the structure for illuminating relying on fluorescent tube in the background technology of the utility model.
[0023] Figure 4 It is a structure schematic diagram of the structure for illuminating relying on fluorescent tube in the background technology of the utility model.
[0024] Figure 5 It is Figure 3 The local enlarged schematic diagram of A in it.
[0025] Figure 6 It is the schematic diagram of the second reflecting surface of the utility model for light reflection.
[0026] Figure 7 It is Figure 3 The local enlarged schematic diagram of B in it.
[0027] Figure 8 It is a structure schematic diagram of the structure for illuminating relying on fluorescent tube in the background technology of the utility model.
[0028] In the drawing: 100-the body;110-light source cavity;111-incident plane;120-first reflecting surface;130-second reflecting surface;140-exit surface;141-exit prism;142-refraction surface;143-connection surface;131-reflecting prism;132-reflecting surface;150-connection part;10-blackboard;20-human eye;30-light source. DETAILED DESCRIPTION
[0029] For the convenience of understanding of those skilled in the art, the utility model is further described below in combination with the embodiments and the drawings, and the content mentioned in the embodiments is not a limitation on the utility model. The utility model is described in detail below in combination with the drawings.
[0030] The utility model embodiment provides a lens, is used in blackboard 10 lamp, LED light source 30 is installed in the light source cavity 110 of the lens provided in this embodiment, light enters the body 100 along the incident plane 111, and the light is reflected towards the exit plane direction through the second reflecting surface, at this time, the light reflected by the second reflecting surface is dispersed towards the blackboard 10 direction through the exit prism 141 arranged on the reflecting surface and dispersed through the exit surface 140 above the exit prism 141, can be evenly irradiated on the blackboard 10, guarantee the uniformity of the brightness on the blackboard 10, simultaneously, through the second reflecting surface, the light towards the student eye is refracted towards the exit surface 140 direction, thereby can be refracted the light of light source 30 towards the student direction, avoids the glare after the light irradiation to the human eye 20 and the visual fatigue after long-term irradiation.
[0031] Specifically as Figures 3-7 As shown in the figure, the utility model provides a classroom lighting anti-glare blackboard 10 lamp lens, comprising a body 100, the light source cavity 110, the first reflecting surface 120, the second reflecting surface and the exit surface 140 are set up on the body 100, the light source cavity 110 is shaped on the top of the body 100, and the inner wall of the light source cavity 110 forms the incident plane 111 for light to pass through;The first reflecting surface 120 includes two that are set up on both sides of the light source cavity 110, and gradually extends towards the lower side from the opening side edge of the light source cavity 110 respectively;The second reflecting surface is located in the lower side of one of the first reflecting surface 120, and is towards the light source cavity 110, and the normal direction of the second reflecting surface and the bottom of the light source cavity 110 orthographic projection is 45 ° angle;The exit surface 140 is set up in the side corresponding to the second reflecting surface, and the lower end of the exit surface 140 is connected with the lower end of the second reflecting surface, and the exit surface 140 is provided with a plurality of exit prisms 141 that are side by side along from the upper end towards the lower end of the second reflecting surface, each exit prism 141 has mutually adjacent refracting surface 142 and connecting surface 143, the connecting surface 143 and the refracting surface 142 of adjacent another exit prism 141 are connected with each other, and the refracting surface 142 is set up with the second reflecting surface corresponding to each other.
[0032] During use, the lens is fixed by an external fixing device (such as a lampshade), and the light source 30 is sleeved inside the light source cavity 110. In this embodiment, the light emitted from the light source 30 shines into the body 100 along the incident surface 111. At this time, the light propagates within the body 100 and is reflected towards the exit surface 140 by the refraction of the second reflecting surface, and then emitted towards the blackboard 10 along the exit surface 140. In this embodiment, the second reflecting surface forms a 45° angle with the normal direction of the downward projection of the bottom of the light source cavity 110, that is, as shown in the figure. Figure 4 As shown, by tilting the second reflective surface, the light inside the light source 30 can be reflected onto the exit surface 140, thereby preventing the light from shooting out along the second reflective surface towards the student's eyes, thus avoiding glare and eye fatigue. More importantly, the exit prism 141 set on the exit surface 140 can redistribute the light emitted along the exit surface 140, so that the light can be emitted along the refraction surface 142 of the exit prism 141, thereby evenly illuminating the blackboard 10 and making the brightness and illuminance of the blackboard 10 uniform.
[0033] It should be noted that, since the light emitted by the light source 30 is not all directed downwards, but also includes light rays directed to the side, the light rays directed to the side are reflected by the first reflecting surface 120, and thus, after at least one reflection, can be emitted along the exiting surface 140 toward the blackboard 10.
[0034] In this embodiment, the bottom of the light source cavity 110 is configured as an outwardly convex arc surface, and the incident surfaces 111 formed by the other two side walls of the light source cavity 110 are configured as planes. By configuring the bottom of the light source cavity 110 as an outwardly convex arc surface, the efficiency of light entering the light source 30 can be improved. However, a small portion of the light is reflected upwards along the bottom, causing a loss in the light source 30. Therefore, by configuring the bottom of the light source cavity 110 as an outwardly convex arc surface, when a small portion of the light is reflected, it is reflected towards the incident surfaces 111 on both sides of the light source cavity 110 under the reflection of the arc surface, so that it can enter the body 100 along the incident surfaces 111 on both sides, avoiding a loss in the light source 30.
[0035] In this embodiment, in order to ensure that all the light rays passing through the second reflecting surface are emitted along the emitting surface 140, a 45° angle is defined between the emitting surface 140 and the second reflecting surface.
[0036] In the embodiment, in order to make the light rays emitted along the exit surface 140 uniformly distributed on the blackboard 10, the brightness and illumination of the blackboard 10 are relatively uniform, each refractive surface 142 is arranged to be inclined in the same direction as the second reflecting surface, and the angle between each refractive surface 142 and the normal line of the orthographic projection of the bottom of the light source cavity 110 gradually decreases from the upper end to the lower end of the exit surface 140.
[0037] As shown in Figure 4 , the angle between the refractive surface 142 of the exit prism 141 on the upper side of the exit surface 140 and the normal line direction of the orthographic projection of the bottom of the light source cavity 110 towards the downward direction is α, the angle between the refractive surface 142 of the exit prism 141 on the lower side and the normal line direction of the orthographic projection of the bottom of the light source cavity 110 towards the downward direction is β, at this time, α>β, and the angle between each refractive surface 142 and the normal line of the orthographic projection of the bottom of the light source cavity 110 gradually decreases from the upper end to the lower end of the exit surface 140. Through the above design, the angles between the light rays emitted through the refractive surface 142 are inclined towards the downward direction, as shown in Figure 8 , the blackboard 10 is arranged above the blackboard 10, so the light rays of the light source 30 need to be inclined towards the blackboard 10 direction before they can make the brightness on the blackboard 10 relatively uniform. Since the blackboard 10 is along the height direction, the distance between the lower end and the light source 30 is larger, so that the light rays of the conventional light source 30 cannot fully irradiate the lower end of the blackboard 10, but concentrate on the upper end of the blackboard 10. Through the lens provided in the embodiment, the exit prisms 141 are arranged side by side on the exit surface 140, and the refractive surface 142 of each exit prism 141 is arranged to be inclined and the angle of inclination is adjusted, so that the light rays are emitted along the refractive surface 142, and the angle between the refractive surface 142 and the normal line of the orthographic projection of the bottom of the light source cavity 110 gradually decreases, so that the angle of the light rays emitted gradually inclines towards the downward direction, so that the light rays can uniformly irradiate on the blackboard 10, and ensure the uniformity of the brightness and illumination of the blackboard 10.
[0038] In the embodiment, in order to avoid the refraction of the light rays caused by the connecting surface 143, the connecting surface 143 is perpendicular to the normal line of the orthographic projection of the bottom of the light source cavity 110. Thus, in the process of reflecting the light rays along the second reflecting surface, the connecting surface 143 avoids causing refraction to the reflected light rays, so as to affect the emission of the light rays along the refractive surface 142.
[0039] The LED light source 30 is not a point light source 30, so the light rays emitted by the LED light source 30 are not completely close to ideal collimation, so that part of the light rays cannot satisfy the total reflection condition and are reflected towards the exit surface 140 direction, so that part of the light rays will pass through the second reflecting surface and be emitted towards the student direction. At this time, it is inevitable to cause light loss, and also cause visual fatigue of the students and occurrence of glare. At this time, as shown inFigure 3 、 5 -6, the second reflecting surface is provided with a plurality of reflecting prisms 131 arranged side by side along the direction from the front end to the rear end, and the reflecting prisms 131 have two reflecting surfaces 132 adjacent to each other.
[0040] At this time, after the light rays that are not collimated are incident on the second reflecting surface, as shown in Figure 6 , the light rays are reflected by the reflecting surfaces 132 of the reflecting prisms 131 and then exit towards the exit surface 140, so that the light rays emitted by the light source 30 are totally reflected by the second reflecting surface, and the light loss caused by the light rays passing through the second reflecting surface is eliminated. In addition, the color drift of the LED is also eliminated, and the color is more uniform, the color temperature is more accurate, and the color rendering index is higher.
[0041] In the embodiment, in order to improve the performance of the reflecting prisms 131 in totally reflecting the light rays, the included angle between the two reflecting surfaces 132 on each reflecting prism 131 is 90°.
[0042] In order to facilitate the installation of the lens, the connecting portion 150 is arranged on the body 100, and the connecting portion 150 is formed on both sides of the body 100 and separates the first reflecting surface 120 and the second reflecting surface and the first reflecting surface 120 and the refracting surface 142.
[0043] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application is disclosed as above in the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the present application, and any equivalent embodiment with equivalent changes is equivalent to the above embodiment. Any simple modification, equivalent change and modification of the above embodiment within the scope of the present application are all within the scope of the present application.
Claims
1. A classroom lighting anti-glare blackboard lamp lens comprising a body, characterized in that, The body is provided with a light source cavity formed on the top of the body, and the inner wall of the light source cavity forms an incident surface for light to pass through; a first reflecting surface, which includes two first reflecting surfaces arranged on both sides of the light source cavity and gradually extending downward from the edges of the openings on both sides of the light source cavity, respectively; a second reflecting surface, which is located on the lower side of one of the first reflecting surfaces and faces the light source cavity, and the normal direction of the orthographic projection of the bottom of the light source cavity forms a 45° angle with the second reflecting surface; an exit surface arranged on the side corresponding to the second reflecting surface, and the lower end of the exit surface is connected to the lower end of the second reflecting surface, the exit surface is provided with a plurality of exit prisms arranged side by side along the direction from the upper end to the lower end of the second reflecting surface, each of the exit prisms has a refracting surface and a connecting surface, the connecting surface is connected to the refracting surface of another adjacent exit prism, and the refracting surface is arranged corresponding to the second reflecting surface.
2. A classroom lighting anti-glare blackboard lamp lens according to claim 1, characterized in that, The exit surface and the second reflecting surface define a 45° angle therebetween.
3. A classroom lighting anti-glare blackboard lamp lens according to claim 2, characterized in that, Each of the refracting surfaces is arranged at the same inclination as the inclination of the second reflecting surface, and the angle between each of the refracting surfaces and the normal of the orthographic projection of the bottom of the light source cavity gradually decreases from the upper end to the lower end of the exit surface.
4. A classroom lighting anti-glare blackboard lamp lens according to claim 2, characterized in that, The connecting surface is perpendicular to the normal of the orthographic projection of the bottom of the light source cavity.
5. A classroom lighting anti-glare blackboard lamp lens according to claim 1, wherein, The second reflecting surface is provided with a plurality of reflecting prisms arranged side by side along the direction from the front end to the rear end, and the reflecting prisms have two reflecting surfaces adjacent to each other.
6. A classroom lighting anti-glare blackboard lamp lens according to claim 5, characterized in that, The angle between the two reflecting surfaces on each of the reflecting prisms is 90°.
7. A classroom lighting anti-glare blackboard lamp lens according to claim 1, wherein, The body is provided with a connecting portion formed on both sides of the body and separating the first reflecting surface and the second reflecting surface, the first reflecting surface and the refracting surface, respectively.
8. A classroom lighting anti-glare blackboard lamp lens according to claim 1, wherein, The bottom of the light source cavity is provided as an outwardly convex arc surface, and the incident surface formed by the other two side walls of the light source cavity is provided as a plane.