A super-thin blackboard lamp with uniform brightness

Abstract

The application discloses a super-thin blackboard lamp with uniform brightness, which comprises a shell, a light source, a polarized light-transmitting part and a reflecting part, the shell is provided with a light outlet, the light outlet faces the blackboard, the light source is arranged above the polarized light-transmitting part, the polarized light-transmitting part is arranged between the upper part and the lower part of the shell, the light outlet is arranged on one side of the polarized light-transmitting part, the polarized light-transmitting part comprises a first side extension, the first side extension protrudes towards the direction where the light outlet is located, the light emitted by the light source can be obliquely downward emitted from the first side extension towards the light outlet, the first side extension comprises a first emission surface, a second emission surface and a third emission surface, and the first emission surface, the second emission surface and the third emission surface are all arranged obliquely. By adopting the application, the brightness uniformity at different heights of the blackboard can be improved, the lighting effect is improved, and the use comfort is improved.

Description

Technical Field

[0001] This invention relates to the field of blackboard lamp technology, and more particularly to an ultra-thin blackboard lamp with uniform brightness. Background Technology

[0002] Blackboard lights are common teaching equipment, typically installed on classroom walls or ceilings to provide sufficient illumination for clear visibility of the blackboard or whiteboard. A blackboard light mainly consists of a light source, lens, reflector, and anti-glare structure. The main body of the light source is usually a strip-shaped LED light source. The reflector is used to reflect the light emitted from the light source onto a designated surface at a certain angle. Although existing blackboard lights generally use the principle of reflection to illuminate the blackboard surface, due to the structural limitations of the reflector and lens, the light density differs between the center and the edges, easily causing uneven brightness of the emitted light. This results in different brightness levels on different parts of the blackboard or whiteboard, affecting the lighting effect and reducing the comfort of teachers and students. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an ultra-thin blackboard lamp with uniform brightness, which can improve the brightness uniformity at different heights of the blackboard, improve the lighting effect, and thus improve the user comfort.

[0004] To solve the above-mentioned technical problems, the present invention provides an ultra-thin blackboard lamp with uniform brightness, including a shell, a light source, a polarizing light-transmitting component, and a reflector. The shell has a receiving cavity, and the polarizing light-transmitting component and the reflector are both disposed in the receiving cavity.

[0005] The light source is disposed inside the housing and above the polarizing light-transmitting element. The polarizing light-transmitting element is disposed between the upper and lower parts of the housing. The light-emitting surface of the light source faces the polarizing light-transmitting element. The housing is provided with a light-emitting port, which is located on the side of the accommodating cavity. The reflector is located on the side of the polarizing light-transmitting element away from the light-emitting port.

[0006] The polarizing light-transmitting element includes a first side extension, which protrudes in the direction of the light outlet, and the light emitted by the light source can be emitted obliquely downward from the first side extension toward the light outlet.

[0007] As an improvement to the above solution, the polarizing light-transmitting element includes a light-receiving portion, which is disposed on the upper part of the polarizing light-transmitting element and located below the light source element. The light-receiving portion includes a front light-receiving surface and side light-receiving surfaces disposed on both sides of the front light-receiving surface. The front light-receiving surface is located below the light source element. One side of the side light-receiving surface is connected to both sides of the front light-receiving surface, and the other side of the side light-receiving surface extends upward at an angle away from the front light-receiving surface.

[0008] As an improvement to the above solution, the first side extension includes a first emission surface, a second emission surface and a third emission surface. The first emission surface is connected to the second emission surface, and the second emission surface is connected to the third emission surface. The first emission surface, the second emission surface and the third emission surface are all inclined.

[0009] As an improvement to the above scheme, the tilt angle between the first emission surface and the horizontal plane is in the range of 20°-30°; the tilt angle between the second emission surface and the horizontal plane is in the range of 40°-50°; and the tilt angle between the third emission surface and the horizontal plane is in the range of 10°-20°.

[0010] As an improvement to the above solution, the upper part of the outer shell is provided with an upper mounting part, which includes a top plate, a first folding plate and a second folding plate respectively connected to both sides of the top plate. The first folding plate, the top plate and the second folding plate form a hidden cavity, and the light source is disposed in the hidden cavity. The first side extension also includes an abutment platform, which is disposed above the third emission surface. The upper surface of the abutment platform is parallel to the lower surface of the second folding plate and located below the lower surface of the second folding plate.

[0011] As an improvement to the above solution, the polarizing light-transmitting element further includes a second side extension, which extends in a direction away from the light outlet. The second side extension includes a rear abutment surface, which is parallel to the side of the reflector and disposed on the side of the reflector.

[0012] As an improvement to the above solution, the polarizing light-transmitting element further includes a main emitting surface and a reflecting surface. The main emitting surface is located on the side of the polarizing light-transmitting element closer to the light-emitting port. The main emitting surface is vertically arranged and connected to the first emitting surface. The reflecting surface is located on the side away from the light-emitting port. The reflecting surface is connected to the rear abutment surface through a transition surface. The transition surface is inclined downward from the rear abutment surface toward the side closer to the light-emitting port.

[0013] As an improvement to the above solution, the upper mounting part further includes a first mounting hook groove and a second mounting hook groove. The first mounting hook groove and the second mounting hook groove are respectively located at the lower ends of the first folding plate and the second folding plate. The bottom of the outer shell is provided with a lower mounting part, which includes a first insertion groove and a second insertion groove. The upper and lower ends of the reflector are respectively located between the first mounting hook groove and the first insertion groove. The bottom of the polarizing light-transmitting element is provided with a plug-in part, which can be inserted into the second insertion groove.

[0014] As an improvement to the above solution, the lower mounting part further includes a third insertion slot, which together with the second mounting hook slot forms the light outlet. The ultra-thin blackboard lamp with uniform brightness also includes a diffuser plate, which is disposed between the third insertion slot and the second mounting hook slot.

[0015] As an improvement to the above solution, the polarizing light-transmitting element is a Fresnel polarizing lens, and the reflecting surface is a toothed surface.

[0016] Implementing this invention has the following beneficial effects:

[0017] This invention provides an ultra-thin blackboard lamp with uniform brightness, comprising a housing, a light source, a polarizing light-transmitting element, and a reflector. The housing has a light outlet facing the blackboard. The light source is positioned above the polarizing light-transmitting element, and the light outlet is located on one side of the polarizing light-transmitting element. The light source illuminates the polarizing light-transmitting element from above, emitting light from top to bottom. The light is reflected and refracted within the polarizing light-transmitting element and ultimately refracted out from one side of the element. Because the polarizing light-transmitting element is located at the upper and lower parts of the housing... Between them, its side spans the entire light outlet, so the refracted light can be evenly distributed from top to bottom along the side of the polarizing light-transmitting element. Since the polarizing light-transmitting element has a first side extension, the light emitted by the light source can be obliquely shot downward from the first side extension toward the light outlet to illuminate the blackboard obliquely below. The first side extension can make the light obliquely downward and accurately fall on the blackboard, realizing precise light control. Combined with the structure of the polarizing light-transmitting element, it can improve the brightness uniformity of the blackboard at different heights, improve the lighting effect, and thus improve the user comfort. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the ultra-thin blackboard lamp with uniform brightness according to the present invention;

[0019] Figure 2 This is a partial cross-sectional structural diagram of the ultra-thin blackboard lamp with uniform brightness according to the present invention;

[0020] Figure 3 yes Figure 2 A magnified view of part A in the image;

[0021] Figure 4 yes Figure 2 A magnified view of part B in the image;

[0022] Figure 5 This is a schematic diagram of the optical path of the ultra-thin blackboard lamp with uniform brightness according to the present invention;

[0023] Figure 6 This is a schematic diagram of the optical path of the first side extension of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside, and outside used in this text are based solely on the accompanying drawings and are not intended to specifically limit the invention.

[0025] See Figure 1 , Figure 2 and Figure 5 This invention discloses an ultra-thin blackboard lamp 10 with uniform brightness, comprising a housing 1, a light source 2, a polarizing light-transmitting element 3, and a reflector 4. The housing 1 has a cavity 11, within which both the polarizing light-transmitting element 3 and the reflector 4 are disposed. The polarizing light-transmitting element 3 reflects and refracts the light emitted by the light source 2. The polarizing light-transmitting element 3 has different refractive indices for different wavelengths of light. The reflector 4 reflects the light. The light source 2 is preferably an LED lamp.

[0026] The light source 2 is disposed inside the housing 1 and above the polarizing light-transmitting element 3. The light-emitting surface of the light source 2 faces the polarizing light-transmitting element 3, and the light source 2 can illuminate the polarizing light-transmitting element 3 from top to bottom. After the light is refracted into the polarizing light-transmitting element 3, part of the light will be repeatedly reflected and refracted within the polarizing light-transmitting element 3, and part will be refracted out from the side of the polarizing light-transmitting element 3. The polarizing light-transmitting element 3 is disposed between the upper and lower parts of the housing 1. The housing 1 has a light-emitting port 13, which is located on the side of the accommodating cavity 11 and faces the side where the blackboard 6 is located. Since the polarizing light-transmitting element 3 is located on the upper part of the housing 1... Between the upper and lower parts, when light is refracted from the polarizing light-transmitting element 3, it will be distributed along the polarizing light-transmitting element 3 from top to bottom, so that the light refracted from the polarizing light-transmitting element 3 can obtain a more uniform brightness effect at different heights. The reflector 4 is located on the side of the polarizing light-transmitting element 3 away from the light outlet 13. For the light refracted from the side of the polarizing light-transmitting element 3 away from the light outlet 13, the reflector 4 can reflect the light back. Part of the reflected light will re-enter the polarizing light-transmitting element 3 and be refracted from the side closer to the light outlet 13, and the other part will continue to be repeatedly reflected between the polarizing light-transmitting element 3 and the reflector 4.

[0027] To further improve the uniformity of the emitted light brightness, the polarizing light-transmitting element 3 includes a first side extension 32, which protrudes towards the light outlet 13. Guided by the shape of the first side extension 32, the light emitted by the light source 2 can be obliquely emitted downward from the first side extension 32 towards the light outlet 13. Since the height of the blackboard lamp is generally higher than that of the blackboard 6, the position of the blackboard 6 is obliquely downward relative to the blackboard lamp. Guided by the first side extension 32, the light emitted by the light source 2 obliquely and uniformly illuminates the blackboard 6, thereby achieving high brightness uniformity at different heights of the blackboard 6.

[0028] The beneficial effects of the embodiments of the present invention are as follows:

[0029] The ultra-thin blackboard lamp 10 with uniform brightness in this embodiment of the invention includes a housing 1, a light source 2, a polarizing light-transmitting element 3, and a reflector 4. The housing 1 has a light outlet 13 facing the blackboard 6. The light source 2 is positioned above the polarizing light-transmitting element 3, and the light outlet 13 is located on one side of the polarizing light-transmitting element 3. The light source 2 illuminates the polarizing light-transmitting element 3 from above, emitting light from top to bottom. The light is reflected and refracted within the polarizing light-transmitting element 3 and finally refracted out from one side of the polarizing light-transmitting element 3. Because the polarizing light-transmitting element 3 is located on the housing 1... Between the upper and lower parts, its side spans the entire light outlet 13, so the refracted light can be evenly distributed from top to bottom along the side of the polarizing light-transmitting element 3. Since the polarizing light-transmitting element 3 is provided with a first side extension 32, the light emitted by the light source 2 can be obliquely shot downward from the first side extension 32 toward the light outlet 13 to illuminate the blackboard 6 obliquely below. The first side extension 32 can make the light obliquely downward and accurately fall on the blackboard 6, realizing precise light control. Combined with the structure of the polarizing light-transmitting element 3, it can improve the brightness uniformity of the blackboard 6 at different heights, improve the lighting effect, and thus improve the user comfort.

[0030] Specifically, see Figure 3The polarizing light-transmitting element 3 includes a light-receiving portion 31, which is located on the upper part of the polarizing light-transmitting element 3 and below the light source element 2. The light-receiving portion 31 is used to receive light from the light source element 2. The light-receiving portion 31 includes a front light-receiving surface 311 and side light-receiving surfaces 312 located on both sides of the front light-receiving surface 311. The front light-receiving surface 311 is located below the light source element 2 and receives most of the light emitted by the light source element 2. One side of the side light-receiving surface 312 is connected to both sides of the front light-receiving surface 311, and the other side of the side light-receiving surface 312 extends upward at an angle away from the front light-receiving surface 311. The angled light emitted from the side of the light source element 2 enters the polarizing light-transmitting element 3 through the side light-receiving surface 312. The side light-receiving surface 312 and the front light-receiving surface 311 ensure that light can accurately enter the polarizing light-transmitting element 3.

[0031] See Figure 4 and Figure 6 The first side extension 32 includes a first emission surface 321, a second emission surface 322, and a third emission surface 323. The first emission surface 321 is connected to the second emission surface 322, and the second emission surface 322 is connected to the third emission surface 323. The first emission surface 321, the second emission surface 322, and the third emission surface 323 are all inclined, and the inclination angles of the first emission surface 321, the second emission surface 322, and the third emission surface 323 are different. By setting continuous first emission surfaces 321, second emission surfaces 322, and third emission surfaces 323... When light is refracted from the three exiting surfaces 321, 322, and 323, three illumination ranges are formed. By reasonably setting the vertical height and tilt angle of the first exiting surface 321, the second exiting surface 322, and the third exiting surface 323, the first exiting surface 321, the second exiting surface 322, and the third exiting surface 323 can correspond to the upper, middle, and lower areas of the blackboard 6, respectively. This allows for the control of the illumination intensity falling on different areas of the blackboard 6 in a refined manner, thereby achieving a more uniform brightness distribution effect.

[0032] Further, see Figure 4The tilt angle α between the first emitting surface 321 and the horizontal plane ranges from 20° to 30°; the tilt angle β between the second emitting surface 322 and the horizontal plane ranges from 40° to 50°; and the tilt angle θ between the third emitting surface 323 and the horizontal plane ranges from 10° to 20°. The second emitting surface 322 has a larger tilt angle, primarily used to refract most of the light to the center of the blackboard 6, ensuring good illumination for the frequently used central portion of the blackboard 6. The first emitting surface 321 and the third emitting surface 323 have smaller tilt angles, primarily used to compensate for the insufficient illumination of the upper and lower parts of the blackboard 6, avoiding the uneven brightness seen in traditional blackboard lights. Vertically, the vertical distance of the second emitting surface 322 is greater than that of the first emitting surface 321 and the third emitting surface 323, further ensuring the illumination area and effect in the center of the blackboard 6.

[0033] The upper part of the outer shell 1 is provided with an upper mounting part 14. The upper mounting part 14 includes a top plate 141, a first folding plate 142 and a second folding plate 143 respectively connected to both sides of the top plate 141. The first folding plate 142 and the second folding plate 143 are both folded back from the outside of the top plate 141 to the side of the outer shell 1. The first folding plate 142, the top plate 141 and the second folding plate 143 form a hidden cavity 12. The light source 2 is disposed in the hidden cavity 12. For ease of installation, the first side extension 32 further includes an abutment platform 324, which is located above the third emission surface 323. The upper surface of the abutment platform 324 is parallel to and below the lower surface of the second folding plate 143. During installation, the abutment platform 324 can be inserted by pressing against the lower surface of the second folding plate 143. Furthermore, if the polarizing light-transmitting element 3 shakes, the abutment platform 324 can abut against the lower surface of the second folding plate 143, thereby providing a blocking and limiting effect. The first side extension 32 serves both to disperse light for precise area control and to facilitate installation and fixation.

[0034] The polarizing light-transmitting element 3 further includes a second side extension 33, the height of which corresponds to the height of the first side extension 32. The second side extension 33 extends away from the light outlet 13. The second side extension 33 includes a rear abutment surface 331, which is parallel to the side of the reflector 4 and disposed on the side of the reflector 4. During installation, the rear abutment surface 331 can be inserted against the surface of the reflector 4, and the reflector 4 also provides a limiting effect on the rear abutment surface 331. In addition, the rear abutment surface 331 allows light reflected from the reflector 4 to directly enter the second side extension 33 and be refracted out by the first side extension 32 to supplement the light in the first side extension 32. Moreover, the supplemented light path is shorter and the efficiency is higher.

[0035] In addition, the polarizing light-transmitting element 3 also includes a main emitting surface 34 and a reflecting surface 35. The main emitting surface 34 is disposed on the side of the polarizing light-transmitting element 3 near the light-emitting port 13. The main emitting surface 34 is vertically arranged and connected to the first emitting surface 321. The reflecting surface 35 is disposed on the side away from the light-emitting port 13. That is, the main emitting surface 34 and the reflecting surface 35 are respectively disposed on different sides of the polarizing light-transmitting element 3. The reflecting surface 35 is close to the reflector 4. The reflecting surface 35 is connected to the rear abutment surface 331 through a transition surface 36. The transition surface 36 is inclined downward from the rear abutment surface 331 toward the side near the light-emitting port 13. After the light from the light source 2 is refracted into the polarizing light-transmitting element 3, a portion of the light is refracted out from the first side extension 32; a portion of the light is reflected between the main emission surface 34 and the reflective surface 35, and most of this portion of light can be refracted out through the main emission surface 34, while the remaining portion will continue to be reflected between the main emission surface 34 and the reflective surface 35; a portion of the light is refracted out from the reflective surface 35 and reflected back into the polarizing light-transmitting element 3 by the reflector 4, and most of this portion of light can also be refracted out through the main emission surface 34. The light refracted from the main emission surface 34 will supplement the illumination of the blackboard 6 at different angles to improve the brightness of the blackboard 6.

[0036] Further, see Figure 5 and Figure 6To improve brightness uniformity, the polarizing light-transmitting element 3 is a Fresnel polarizing lens, and the reflecting surface 35 is a textured surface. A Fresnel polarizing lens can convert unpolarized light into polarized light. Light passing through the polarizing light-transmitting element 3 will be polarized. Different wavelengths of light have different polarization angles and refraction angles. Utilizing this characteristic, a portion of the blue light emitted by the light source 2 can be refracted at a larger angle, preventing it from falling onto the illuminated object, thus achieving a blue light blocking effect. The reflecting surface can focus the light using its textured surface, making the light refracted by the main emission surface 34 brighter and more concentrated. The reflective surface 35 has multiple helical teeth 351, which are inclined downwards from top to bottom towards the side away from the reflector 4. The angle between the inclined surface of the helical teeth 351 and the horizontal plane ranges from 75° to 88°. By setting the helical teeth 351, light can be reflected downwards at an angle in the reflective surface 35, and the light reflected back from the reflector 4 can be refracted downwards at an angle, so that the light can fall into the blackboard 6 diagonally below. At the same time, by reasonably setting the angle of the inclined surface of the helical teeth 351, blue light can be repeatedly reflected between the reflective surface 35 and the main emission surface 34 until most of the blue light is absorbed by the inner wall of the outer casing 1, thereby further eliminating blue light. In addition, compared with traditional spherical lenses, the polarizing light-transmitting element 3 has the oblique teeth 351, which can simulate the curved surface of a spherical lens to refract light. Since the oblique teeth 351 is not a continuous curved surface, the polarizing light-transmitting element 3 can be designed to be thinner, thus giving the ultra-thin blackboard lamp 10 with uniform brightness the advantage of thinness.

[0037] For ease of installation, the upper mounting portion 14 further includes a first mounting hook groove 144 and a second mounting hook groove 145. The first mounting hook groove 144 and the second mounting hook groove 145 are respectively located at the lower ends of the first folding plate 142 and the second folding plate 143. The bottom of the outer casing 1 is provided with a lower mounting portion 15, which includes a first insertion groove 151 and a second insertion groove 152. The upper and lower ends of the reflector 4 are respectively located between the first mounting hook groove 144 and the first insertion groove 151. During installation, the reflector 4 is inserted between the first mounting hook groove 144 and the first insertion groove 151, and the first mounting hook groove 144 and the first insertion groove 151 limit and fix the reflector 4. The bottom of the polarizing light-transmitting element 3 is provided with a plug-in portion. During installation, the plug-in portion can be inserted into the second insertion groove 152, and the second insertion groove 152 limits and fixes the polarizing light-transmitting element 3.

[0038] The ultra-thin blackboard lamp 10 with uniform brightness also includes a diffuser plate 5. The diffuser plate 5 can evenly disperse and scatter the light from the polarizing light-transmitting element 3, thereby achieving a more uniform lighting effect. Blue light emitted from the polarizing light-transmitting element 3 is also absorbed and mixed when it enters the diffuser plate 5, thereby further eliminating blue light. The lower mounting part 15 also includes a third insertion slot 153, which, together with the second mounting hook slot 145, forms the light outlet 13. The diffuser plate 5 is disposed in the light outlet 13 to disperse and scatter the light entering the diffuser plate 5, further improving the uniformity of the blackboard 6's brightness. After testing, the average illuminance of this embodiment can reach 737 l x, the uniformity reaches 0.91, and the minimum / maximum illuminance ratio is 0.84, indicating good brightness uniformity. The diffuser plate 5 is disposed between the third insertion slot 153 and the second mounting hook slot 145. During installation, the diffuser plate 5 is inserted between the third insertion slot 153 and the second mounting hook slot 145.

[0039] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A thin blackboard lamp with uniform brightness, characterized in that, It includes a housing, a light source, a polarizing light-transmitting element, and a reflector. The housing has a receiving cavity, and the polarizing light-transmitting element and the reflector are both disposed within the receiving cavity. The light source is disposed inside the housing and above the polarizing light-transmitting element. The polarizing light-transmitting element is disposed between the upper and lower parts of the housing. The light-emitting surface of the light source faces the polarizing light-transmitting element. The housing is provided with a light-emitting port, which is located on the side of the accommodating cavity. The reflector is located on the side of the polarizing light-transmitting element away from the light-emitting port. The polarizing light-transmitting element includes a first side extension, which protrudes in the direction of the light outlet, and the light emitted by the light source can be emitted obliquely downward from the first side extension toward the light outlet. The first side extension includes a first emission surface, a second emission surface, and a third emission surface. The first emission surface is connected to the second emission surface, and the second emission surface is connected to the third emission surface. The first emission surface, the second emission surface, and the third emission surface are all inclined. The tilt angle between the first emission surface and the horizontal plane is in the range of 20°-30°; the tilt angle between the second emission surface and the horizontal plane is in the range of 40°-50°; and the tilt angle between the third emission surface and the horizontal plane is in the range of 10°-20°. The upper part of the outer shell is provided with an upper mounting part, which includes a top plate, a first folding plate and a second folding plate respectively connected to both sides of the top plate. The first folding plate, the top plate and the second folding plate form a hidden cavity, and the light source is disposed in the hidden cavity. The first side extension also includes an abutment platform, which is disposed above the third emission surface. The upper surface of the abutment platform is parallel to the lower surface of the second folding plate and located below the lower surface of the second folding plate.

2. The ultra-thin blackboard lamp with uniform brightness according to claim 1, characterized in that, The polarizing light-transmitting element includes a light-receiving portion, which is disposed on the upper part of the polarizing light-transmitting element and located below the light source element. The light-receiving portion includes a front light-receiving surface and side light-receiving surfaces disposed on both sides of the front light-receiving surface. The front light-receiving surface is located below the light source element. One side of the side light-receiving surface is connected to both sides of the front light-receiving surface, and the other side of the side light-receiving surface extends upward at an angle away from the front light-receiving surface.

3. The ultra-thin blackboard lamp with uniform brightness according to claim 1, characterized in that, The polarizing light-transmitting element further includes a second side extension, which extends in a direction away from the light outlet. The second side extension includes a rear abutment surface, which is parallel to the side of the reflector and is located on the side of the reflector.

4. The ultra-thin blackboard lamp with uniform brightness according to claim 3, characterized in that, The polarizing light-transmitting element further includes a main emitting surface and a reflective surface. The main emitting surface is located on the side of the polarizing light-transmitting element closer to the light-emitting port. The main emitting surface is vertically arranged and connected to the first emitting surface. The reflective surface is located on the side away from the light-emitting port. The reflective surface is connected to the rear abutment surface through a transition surface. The transition surface is inclined downward from the rear abutment surface toward the side closer to the light-emitting port.

5. The ultra-thin blackboard lamp with uniform brightness according to claim 1, characterized in that, The upper mounting portion further includes a first mounting hook groove and a second mounting hook groove, the first mounting hook groove and the second mounting hook groove being respectively located at the lower ends of the first folding plate and the second folding plate. The bottom of the outer shell is provided with a lower mounting portion, the lower mounting portion including a first insertion groove and a second insertion groove. The upper and lower ends of the reflector are respectively located between the first mounting hook groove and the first insertion groove. The bottom of the polarizing light-transmitting element is provided with a plug-in portion, the plug-in portion being able to be inserted into the second insertion groove.

6. The ultra-thin blackboard lamp with uniform brightness according to claim 5, characterized in that, The lower mounting portion further includes a third insertion slot, which, together with the second mounting hook slot, forms the light outlet. The ultra-thin blackboard lamp with uniform brightness also includes a diffuser plate, which is disposed between the third insertion slot and the second mounting hook slot.

7. The ultra-thin blackboard lamp with uniform brightness according to claim 4, characterized in that, The polarizing light-transmitting element is a Fresnel polarizing lens, and the reflecting surface is a toothed surface.

Images