Lens and lighting device

Abstract

The application provides a lens and a lighting device, wherein the lens is of a symmetric structure and has a central symmetry plane A0, and the lens comprises: a lens body; a light inlet part arranged on a first surface of the lens body and comprising a mounting recess recessed to the inside of the lens body and accommodating a light source, the mounting recess comprising a bottom wall and a cylindrical side wall connected at the edge of the bottom wall; a light outlet part arranged on a second surface of the lens, the second surface being parallel to the first surface, wherein the bottom wall comprises an outer ring part and a central part inside the outer ring part, the outer ring part is arranged protruding towards the direction of the light inlet part, and the central part is arranged protruding towards the direction of the light outlet part; and a reflecting part arranged on the side surface of the lens body and between the first surface and the second surface. The technical scheme of the application effectively solves the problem in the related art that the light path through the lens passes through the middle area of the light outlet plate centrally, so that the illumination on the light outlet plate is uneven.

Description

[0001] This application is a divisional application of a patent application with an application date of July 18, 2022, an application number of 202210843549.1, and an invention creation name of "Lens and Lighting Device".

[0002] Related Application

[0003] This application claims the priority of a Chinese patent application with an application number of 202111089503.7 and a title of "Lens and Lighting Device with the Same", which was filed on September 16, 2021, and the entire content thereof is incorporated herein by reference. Technical Field

[0004] The present invention relates to the field of lighting technology, and in particular, to a lens and a lighting device. Background Art

[0005] With the progress of society and the improvement of living standards, people pay more and more attention to the quality of life and pursue a healthy living environment. It is in this general environment that in recent years, a new type of lighting fixture - a sky light, also known as a blue sky light, etc., has emerged in the home lighting industry. The main features of this sky-simulating lighting fixture are reflected in two aspects: simulating the visual effect of the sky and approximately simulating the oblique irradiation of sunlight into the room.

[0006] To achieve the above effects, there are currently two technical routes: The first technical route is to separately implement the simulation of the sky visual effect and the simulation of the oblique irradiation of light. The oblique irradiation of light is separately achieved by a group of white light sources, and the simulation of the sky visual effect is achieved by a group of color light sources through color matching to obtain sky blue, and then the light is evenly irradiated on the light-emitting plate through optical design. The second technical route is to use optical design to make a group of white light sources obliquely irradiate a light-emitting plate, which can achieve the sky blue visual effect of the light-emitting plate while ensuring the oblique emission of light, and the emitted light is white light.

[0007] For the above second technical route, there are mainly several systems: The first is a reflective optical path system combining multiple light sources with a lens and a reflector; the second is a direct-down optical path system combining multiple light sources with a lens; the third is a reflective optical path system combining a single light source with a reflector.

[0008] In the related art, for the direct-down optical path system combining multiple light sources with a lens, although a lighting fixture with a simulated blue sky visual effect can be made, the optical paths of the multiple light sources pass through the middle area of the light-emitting plate concentratedly through the lens, resulting in uneven illuminance on the light-emitting plate, poor visual experience for users in the optical path direction, and a relatively thick size of the entire lighting fixture. Summary of the Invention [[ID=The main object of the present invention is to provide a lens and a lighting device, so as to solve the problem in the related art that the optical path passes through the middle area of the light-emitting plate concentratedly through the lens, resulting in uneven illuminance on the light-emitting plate.

[0010] To achieve the above object, according to one aspect of the present invention, there is provided a lens. The lens is of a symmetric structure and has a central symmetry plane A0. The lens includes: a lens body; a light incident portion provided on the first surface of the lens body and including a mounting recess that is recessed into the lens body and accommodates a light source. The mounting recess includes a bottom wall and a cylindrical side wall connected to the edge of the bottom wall; a light-emitting portion provided on the second surface of the lens, and the second surface is parallel to the first surface. Among them, the bottom wall includes an outer ring portion and a central portion located inside the outer ring portion. The outer ring portion protrudes in the direction towards the light incident portion, and the central portion protrudes in the direction towards the light-emitting portion; a reflection portion provided on the side surface of the lens body and located between the first surface and the second surface.

[0011] Further, the outer ring portion is directly connected to the central portion, and the outer ring portion is formed by sequentially splicing a plurality of curved surfaces along the circumferential direction of the cylindrical side wall.

[0012] Further, the outer ring portion includes a plurality of annular portions that protrude in the direction towards the light incident portion, and the plurality of annular portions are sequentially connected in the direction from the cylindrical side wall to the central portion, and / or the central portion includes a plurality of protruding portions that protrude in the direction towards the light-emitting portion, and the plurality of protruding portions are sequentially connected along the circumferential direction of the outer ring portion.

[0013] According to another aspect of the present invention, a lens is provided. The lens has a symmetric structure and a central symmetry plane A0. The lens includes: a lens body; a light incident portion provided on the first surface of the lens body and including a mounting recess that recesses into the interior of the lens body and houses a light source. The mounting recess includes a bottom wall; a light emitting portion provided on the second surface of the lens, the second surface being parallel to the first surface; a reflection portion provided on the side surface of the lens body and located between the first surface and the second surface; the center of the light source forms a central light point A1 at the opening of the mounting recess, the bottom wall includes a midpoint A2, and a line connecting the midpoint A2 and the central light point A1 is set as a median line L0; the reflection portion includes a first arc surface and a second arc surface symmetrically arranged with respect to the central symmetry plane A0. The first arc surface and the second arc surface form a third intersection line L38 and a fourth intersection line L69 on the central symmetry plane A0. Among them, the third intersection line L38 intersects the first surface at a third intersection point B3. A tangent line of the third intersection line L38 passing through the third intersection point B3 is set as a first extension line L3v, and a fifth included angle is formed between the first extension line L3v and the median line L0, and the fifth included angle is greater than or equal to 45°. The fourth intersection line L69 intersects the first surface at a fourth intersection point B4. A tangent line of the fourth intersection line L69 passing through the fourth intersection point B4 is set as a second extension line L6u, and a sixth included angle is formed between the second extension line L6u and the median line L0, and the sixth included angle is less than or equal to 45°; or, the length of the third intersection line L38 is greater than the length of the fourth intersection line L69.

[0014] According to another aspect of the present invention, a lens is provided. The lens has a symmetric structure and a central symmetry plane A0. The lens includes: a lens body; a light incident portion provided on the first surface of the lens body and including a mounting recess that is recessed into the interior of the lens body to accommodate a light source. The mounting recess includes a bottom wall and a cylindrical side wall connected to the edge of the bottom wall; a light exit portion provided on the second surface of the lens. The bottom wall includes a midpoint A2; a reflection portion provided on the side surface of the lens body and located between the first surface and the second surface. The center of the light source forms a central light point A1 at the opening of the mounting recess. The line connecting the midpoint A2 and the central light point A1 is set as the median line L0. The cylindrical side wall includes a first side wall and a second side wall symmetrically arranged with respect to the central symmetry plane A0. The first side wall and the second side wall form a first intersection line L14 and a second intersection line L25 in the central symmetry plane A0. The bottom wall forms a first curve L01 and a second curve L02 on both sides of the median line L0 in the central symmetry plane A0. Among them, the first curve L01 intersects the first intersection line L14 at a first intersection point B1. The line connecting the central light point A1 and the first intersection point B1 is the first straight line L1. A first included angle is formed between the median line L0 and the first straight line L1. The second curve L02 intersects the second intersection line L25 at a second intersection point B2. The line connecting the central light point A1 and the second intersection point B2 is the second straight line L2. A second included angle is formed between the median line L0 and the second straight line L2. The first included angle is greater than the second included angle.

[0015] Further, a third included angle is formed between the first intersection line L14 and a first perpendicular plane perpendicular to the first surface. The range of the third included angle is between 2° and 5°; and / or, a fourth included angle is formed between the second intersection line L25 and a second perpendicular plane perpendicular to the first surface. The range of the fourth included angle is between 2° and 5°.

[0016] Further, the reflection portion includes a first arc surface and a second arc surface symmetrically arranged with respect to the central symmetry plane A0. The first arc surface and the second arc surface form a third intersection line L38 and a fourth intersection line L69 on the central symmetry plane A0. The third intersection line L38 and the first intersection line L14 are on the same side of the median line L0. The fourth intersection line L69 and the second intersection line L25 are on the same side of the median line L0.

[0017] Further, the fourth intersecting line L69 includes a first intersecting segment L67 and a second intersecting segment L79 connected to the first intersecting segment L67; wherein, the first intersecting segment L67 is closer to the first surface than the second intersecting segment L79, and / or the length of the third intersecting line L38 is greater than the length of the first intersecting segment L67, and / or the second intersecting segment L79 is parallel or inclined to the median line L0, and / or the third intersecting line L38 intersects the second surface at a fifth intersection point, the second intersecting segment L79 intersects the second surface at a sixth intersection point, and the distance between the sixth intersection point and the median line L0 is less than the distance between the fifth intersection point and the median line L0. According to another aspect of the present invention, there is provided a lighting device including a light source and a lens, and the lens is the above-mentioned lens.

[0018] Further, the lighting device further includes a housing and a light-emitting plate. The housing includes a top plate, and the housing is formed with a light-emitting port. The light-emitting plate is disposed at the light-emitting port. The light source and the lens are installed in the housing. The reflecting portion includes a first arc surface and a second arc surface symmetrically disposed with respect to the central symmetry plane A0. The first arc surface and the second arc surface form a third intersecting line L38 and a fourth intersecting line L69 on the central symmetry plane A0. The third intersecting line L38 is closer to the top plate than the fourth intersecting line L69, and the inner side of the third intersecting line L38 faces the light-emitting plate.

[0019] Further, the light-emitting plate is a Rayleigh scattering plate, and the light-emitting plate is located on the path of the light emitted by the light source; and / or, the lighting device includes a sky light or a grid light or a wall washer light or a table lamp or a kitchen and bathroom lamp.

[0020] According to another aspect of the present invention, there is provided a lighting device including a light source and a lens. The lighting device further includes a housing and a light-emitting plate. The light source and the lens are both installed in the housing. The housing includes a top plate and a surrounding plate. The first end of the surrounding plate is connected to the top plate, and the second end of the surrounding plate forms a light-emitting port. The light-emitting plate is disposed at the light-emitting port. Wherein, the vertical projection of the light source on the horizontal plane is located outside the vertical projection of the light-emitting plate on the horizontal plane, and the light source generates asymmetric outgoing light through the lens.

[0021] Further, the lens is a symmetric structure and has a central symmetry plane A0.

[0022] According to another aspect of the present invention, there is provided a lighting device including a light source. The lighting device further includes a housing and a light-emitting plate. The light source is installed in the housing. The housing includes a top plate and a surrounding plate. The first end of the surrounding plate is connected to the top plate, and the second end of the surrounding plate forms a light-emitting port. The light-emitting plate is disposed at the light-emitting port. Wherein, a straight line passing through the central light point A1 of the light source and perpendicular to the ground is set as the vertical axis C1, and a main light ray C2 of the outgoing light beam is formed when the central light point A1 of the light source passes through the housing. A seventh included angle is formed between the vertical axis C1 and the main light ray C2 of the outgoing light beam, and the range of the seventh included angle is between 45° and 80°.

[0023] Further, the enclosing plate includes a first side plate, a second side plate, a third side plate, and a fourth side plate that are sequentially connected. The first side plate, the second side plate, the third side plate, and the fourth side plate are all connected to the top plate. The first side plate and the third side plate are arranged in parallel, the second side plate and the fourth side plate are arranged in parallel, and the distance between the light source and the second side plate is less than the distance between the light source and the fourth side plate.

[0024] Further, the shapes of the first side plate and the third side plate are parallelograms, and the second side plate and the fourth side plate are rectangles.

[0025] According to another aspect of the present invention, there is provided a lighting device including a light source. The lighting device further includes a housing and a light-emitting plate. The light source is installed in the housing. The housing includes a top plate and an enclosing plate. The first end of the enclosing plate is connected to the top plate, the second end of the enclosing plate forms a light-emitting port, the light-emitting plate is disposed at the light-emitting port, the center line of the enclosing plate is inclined with respect to the top plate, and the light source is disposed at the acute angle formed between the enclosing plate and the top plate.

[0026] Further, the light-emitting plate is a Rayleigh scattering plate, and the light-emitting plate is located on the path of the light emitted by the light source.

[0027] Further, a film layer with microstructures is adhered to the side of the light-emitting plate facing the light source.

[0028] Further, the lighting device further includes a lens for decentering and diffusing the light source. [[ID=I7]]

[0029] According to another aspect of the present invention, there is provided a lighting device including a light source. The lighting device further includes a housing and a light-emitting plate. The light source is installed in the housing. The housing includes a top plate and an enclosing plate. The first end of the enclosing plate is connected to the top plate, the second end of the enclosing plate forms a light-emitting port, the light-emitting plate is disposed at the light-emitting port, the light-emitting plate includes a Rayleigh scattering plate, and the lighting device further includes an antireflection structure.

[0030] Further, the antireflection structure is provided on the light-receiving area of the inner wall of the enclosing plate, and / or the antireflection structure is located on one side of the path of the light emitted by the light source, and / or the antireflection structure includes a honeycomb layer, and / or the antireflection structure is a metal part.

[0031] Further, the enclosing plate includes a first side plate, a second side plate, a third side plate, and a fourth side plate that are sequentially connected. The first side plate, the second side plate, the third side plate, and the fourth side plate are all connected to the top plate. The first side plate and the third side plate are arranged in parallel, the second side plate and the fourth side plate are arranged in parallel, the distance between the light source and the second side plate is less than the distance between the light source and the fourth side plate, and the antireflection structure is provided on the fourth side plate.

[0032] Further, the honeycomb layer includes a plurality of interconnected cylinders, with a spacing L between adjacent cylinders, and the ratio of the height H of each cylinder to the spacing L is greater than 1, and / or the honeycomb layer includes a plurality of interconnected cylinders, and the axis of each cylinder is perpendicular to the inner side wall surface of the housing.

[0033] Further, the lighting device includes a sky light, a grille light, a wall washer light, a table lamp, or a kitchen and bathroom lamp.

[0034] Applying the technical solution of the present invention, the lens is a symmetric structure and has a central symmetry plane A0. The lens includes: a lens body, a light incident portion, a light exit portion, and a reflection portion. The light incident portion is disposed on the first surface of the lens body and includes a mounting recess that recesses into the interior of the lens body and houses a light source. The mounting recess includes a bottom wall and a cylindrical side wall connected to the edge of the bottom wall. The light exit portion is disposed on the second surface of the lens, and the second surface is parallel to the first surface. Among them, the bottom wall includes an outer ring portion and a central portion located inside the outer ring portion. The outer ring portion protrudes in the direction towards the light incident portion, and the central portion protrudes in the direction towards the light exit portion. The reflection portion is disposed on the side surface of the lens body and is located between the first surface and the second surface. The bottom wall of the lens cooperates with the light source, and when the light emitted by the light source passes through the central portion that protrudes in the direction towards the light exit portion, it is redistributed, causing the light beam irradiated on the central portion to diverge, capable of generating an asymmetric emitted light. This asymmetric emitted light passes through the middle area of the light exit plate, thereby reducing the illuminance value of the middle area of the light exit plate, and further facilitating improving the uniformity of the illuminance on the light exit plate, so as to enable the user to obtain a better visual experience in the optical path direction. Therefore, the technical solution of the present application effectively solves the problem in the related art that the optical path passes through the middle area of the light exit plate concentratedly through the lens, resulting in uneven illuminance on the light exit plate. The above-mentioned reflection portion can reflect the light incident from the cylindrical side wall to the light exit portion, enabling all the light incident from the cylindrical side wall to exit from the light exit portion, avoiding the light loss caused by the above-mentioned light directly exiting from the surface where the reflection portion is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0036] Figure 1 It shows a schematic diagram of the structure of a light source in the related art passing through a lens and irradiating on a Ruili heat dissipation plate;

[0037] Figure 2 It shows Figure 1 the effect diagram of the light irradiated by the light source passing through the lens;

[0038] Figure 3 It shows Figure 1Perspective schematic diagram of the lens;

[0039] Figure 4 Shows a top view schematic diagram of an embodiment of the lens according to the present invention;

[0040] Figure 5 Shows Figure 4 Top view schematic diagram when the lens is divided by the central symmetry plane A0;

[0041] Figure 6 Shows Figure 4 Three-dimensional structure schematic diagram after the lens is divided by the central symmetry plane A0;

[0042] Figure 7 Shows Figure 6 Front view schematic diagram after the lens is divided by the central symmetry plane A0;

[0043] Figure 8 Shows Figure 4 Structural schematic diagram of the light emitted from the light source of the lens to the Rayleigh heat dissipation plate;

[0044] Figure 9 Shows Figure 8 Effect diagram of the light emitted from the light source of the lens;

[0045] Figure 10 Shows Figure 4 Working principle schematic diagram of the light beam divergence at the center of the lens;

[0046] Figure 11 Shows Figure 4 Working principle schematic diagram when the first included angle of the lens is greater than the second included angle;

[0047] Figure 12 Shows Figure 4 Schematic diagram of the light path emitted from the reflection part of the lens;

[0048] Figure 13 Shows Figure 4 Schematic diagram of making the first extension line and the second extension line on the reflection part of the lens;

[0049] Figure 14 Shows Figure 4 Working principle schematic diagram at the third intersection line of the lens;

[0050] Figure 15 Shows Figure 4 Working principle schematic diagram at the fourth intersection line of the lens;

[0051] Figure 16 Shows <00001​​​Figure 17 Shows Figure 4 a schematic diagram of the working principle of the seventh included angle of the lens;

[0053] Figure 18 Shows Figure 17 a partial distribution diagram of the light intensity of the outgoing light beam corresponding to the seventh included angle of the lens;

[0054] Figure 19 a three-dimensional structural schematic diagram of an embodiment of a lighting device according to the present invention;

[0055] Figure 20 Shows Figure 19 The sectional schematic diagram of the lighting device;

[0056] Figure 21 Shows Figure 19 a sectional schematic diagram of the lighting device from another angle;The three-dimensional structural schematic diagram of the antireflection structure of the lighting device;

[0057] Shows Figure 22

[0058] Figure 19 Shows Figure 23 a partial schematic diagram of the antireflection structure;

[0059] Figure 20 Shows Figure 24 a three-dimensional structural schematic diagram of the cylinder body of the antireflection structure;

[0060] Figure 20 Shows Figure 25 a schematic diagram of the working principle of the antireflection structure of the lighting device; and

[0061] Figure 19 Shows Figure 26 a partial schematic diagram of the working principle of the antireflection structure.

[0062] Among them, the above-mentioned drawings include the following reference numerals:

[0063] 1. Lens; 101. Light source; 10. Lens body; 11. First surface; 12. Second surface; 20. Mounting recess; 21. Bottom wall; 211. Outer ring part; 212. Central part; 22. Cylindrical side wall; 221. First side wall; 222. Second side wall; 30. Reflecting part; 31. First arc surface; 32. Second arc surface; 40. Housing; 41. Top plate; 42. Enclosing plate; 50. Antireflection structure; 51. Cylinder body; 60. Light output plate. Detailed implementation manners

[0064] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0065] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0066] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0067] As Figure 25 shown, the lens has a symmetric structure and has a central symmetry plane A0. The lens includes: a lens body 10, a light incident portion, a light emitting portion, and a reflecting portion 30. The light incident portion is disposed on the first surface 11 of the lens body 10 and includes a mounting recess 20 that is recessed into the interior of the lens body 10 and houses a light source 101. The mounting recess 20 includes a bottom wall 21 and a cylindrical side wall 22 connected to the edge of the bottom wall 21. The light emitting portion is disposed on the second surface 12 of the lens. The second surface 12 is parallel to the first surface 11. Among them, the bottom wall 21 includes an outer ring portion 211 and a central portion 212 located inside the outer ring portion 211. The outer ring portion 211 protrudes in the direction of the light incident portion, and the central portion 212 protrudes in the direction of the light emitting portion. The reflecting portion 30 is disposed on the side surface of the lens body 10 and is located between the first surface 11 and the second surface 12.

[0068] Applying the technical solution of this embodiment, the bottom wall 21 includes an outer ring portion 211 and a central portion 212 located inside the outer ring portion 211. The outer ring portion 211 protrudes in the direction towards the light incident portion, and the central portion 212 protrudes in the direction towards the light emitting portion. When the emitted light of the light source 101 passes through the central portion 212 that protrudes in the direction towards the light emitting portion, redistribution occurs, causing the light beam irradiated on the bottom wall 21 of the central portion 212 to diverge, and an asymmetric emitted light can be generated. This asymmetric emitted light passes through the middle area of the light emitting plate, thereby reducing the illuminance value of the middle area of the light emitting plate, and further facilitating the improvement of the uniformity of the illuminance on the light emitting plate, so as to enable the user to obtain a better visual experience in the optical path direction. Therefore, the technical solution of this embodiment effectively solves the problem in the related art that the optical path passes through the middle area of the light emitting plate concentratedly through the lens, resulting in uneven illuminance on the light emitting plate. The above-mentioned reflecting portion 30 can reflect the light incident from the cylindrical side wall 22 to the light emitting portion, enabling all the light incident from the cylindrical side wall 22 to be emitted from the light emitting portion, and avoiding the light loss caused by the above-mentioned light directly emitting from the surface where the reflecting portion 30 is located.

[0069] It should be noted that the above-mentioned outer ring portion 211 and the central portion 212 are directly connected, and the above-mentioned outer ring portion 211 is formed by sequentially splicing a plurality of curved surfaces along the circumferential direction of the cylindrical side wall 22. Both the second surface 12 and the first surface 11 can be a plane or a curved surface. The second surface 12 being parallel to the first surface 11 means that the included angle between the second surface 12 and the first surface 11 is within the range of 0 to 5 degrees.

[0070] In an embodiment not shown in the figure, the outer ring portion 211 includes a plurality of annular portions that protrude in the direction towards the light incident portion, and the plurality of annular portions are sequentially connected in the direction from the cylindrical side wall 22 to the central portion 212. The central portion 212 includes a plurality of protruding portions that protrude in the direction towards the light emitting portion, and the plurality of protruding portions are sequentially connected along the circumferential direction of the outer ring portion 211. When the emitted light passes through the plurality of annular portions and the plurality of protruding portions that protrude in the direction towards the light emitting portion, multiple redistributions occur, effectively diverging the light beam irradiated on the bottom wall 21 of the central portion 212, and an asymmetric and irregular emitted light can be generated. This asymmetric and irregular emitted light passes through the middle area of the light emitting plate, and thus effectively reduces the illuminance value of the middle area of the light emitting plate. It should be noted that the above-mentioned annular portion can be circular or oval or wavy or polygonal.

[0071] To further illustrate the effect of the redistribution of the emitted light of the light source 101 when passing through the central portion 212, the present application provides a comparison and illustration with the effect diagram of the light source in the related art passing through the lens 1 and irradiating on the Ruili heat dissipation plate.

[0072] Specifically, refer to Figures 4 to 9, the lens 1 in the related art includes a mounting recess that recesses into the interior of the lens body and houses a light source. The mounting recess has an arc-shaped concave surface that protrudes toward the light source. When the light source passes through the central position of the arc-shaped concave surface, the light beam near the central position of the arc-shaped concave surface converges (see Figures 1 to 3 ). In this application, referring to Figure 2 and , when the outgoing light rays of the light source 101 pass through the central portion 212, the light beam in the central portion 212 diverges (see Figure 8 ). Thus, the central portion 212 that protrudes in the direction toward the light-emitting portion in this embodiment can promote the divergence of the light beam in the central portion 212, thereby reducing the illuminance value in the middle region of the light-emitting plate, which is beneficial to promoting the uniformity on the light-emitting plate.

[0073] It should be noted that and Figure 9 the effect of the light beam condensation is the actual simulation result. and Figure 9 the effect of the light beam divergence is the actual simulation result.

[0074] As shown in and Figure 1 , the center of the light source 101 forms a central light spot A1 at the opening of the mounting recess 20. The central portion 212 includes a midpoint A2, and the line connecting the midpoint A2 and the central light spot A1 is set as the median line L0. The cylindrical side wall 22 includes a first side wall 221 and a second side wall 222 that are symmetrically arranged with respect to the central symmetry plane A0. The first side wall 221 and the second side wall 222 form a first intersection line L14 and a second intersection line L25 in the central symmetry plane A0. The outer ring portion 211 forms a first curve L01 and a second curve L02 on both sides of the central portion 212 in the central symmetry plane A0. The central portion 212 forms a third curve L03 connected to the first curve L01 and a fourth curve L04 connected to the second curve L02 in the central symmetry plane A0.

[0075] To specifically analyze the working principle of the divergence of the light beam in the central portion 212 when the outgoing light rays of the light source 101 pass through the central portion 212, take the third curve L03 and the first curve L01 as an example. As shown in and Figure 2 , the specific analysis is as follows:

[0076] The incident light ray at the central light spot A1 is A1A2, and the outgoing light ray is A2e.​​​​​​

[0079] Assume that the refractive index of the material of lens 1 is Rf. According to Snell's law, Rf×sin∠cA2e = sin∠A1A2d.

[0080] The refractive index Rf of the material used for the lens (such as plastic or glass) is constant and >1. Therefore, through simple calculation, it can be obtained that: ∠cA2e < ∠A1A2d, that is, the exit angle is smaller than the incident angle. Correspondingly, the exit light ray A2e deviates from the A2z axis where the incident light ray A1A2 is located. That is, the light beam near the first curve L01 where the midpoint A2 is located diverges.

[0081] Through the above similar reasoning, it can be obtained that: the exit light ray near the second curve L02 where the midpoint A2 is located will deviate from the A2z axis where the incident light ray is located, and the exit light rays passing through the first curve L01 and the exit light rays passing through the second curve L02 are distributed on both sides of the A2z axis, that is, the light beam at the central part 212 diverges.

[0082] Such as and Figure 8 As shown, in this embodiment, the first curve L01 intersects the first intersection line L14 at the first intersection point B1, and the connection line between the central light point A1 and the first intersection point B1 is the first straight line L1. A first included angle is formed between the median line L0 and the first straight line L1. The second curve L02 intersects the second intersection line L25 at the second intersection point B2, and the connection line between the central light point A1 and the second intersection point B2 is the second straight line L2. A second included angle is formed between the median line L0 and the second straight line L2, and the first included angle is greater than the second included angle. In this way, the length of the light-emitting plate covered by the exit light rays corresponding to the first curve L01 and the third curve L03 (the length of the line segment pq) is greater than the length of the light-emitting plate covered by the exit light rays corresponding to the second curve L02 and the fourth curve L04 (the length of the line segment mp), so that there is more light energy in the far end direction of the light-emitting plate, which is beneficial to increasing the illuminance and making the illuminance of the light-emitting plate uniform in the length direction. The far end of the above light-emitting plate refers to the end of the light-emitting plate far from the light source 101.

[0083] The inventor found that since the size of the lens 1 is much smaller than the distance between the lens 1 and the light-emitting plate in practical applications, the lens can be approximately simplified as a light source 101 in the analysis process. The specific analysis of the technical effect that the first included angle is greater than the second included angle is as follows:

[0084] Such as As shown, point A1 is the position of the central light point of the light source 101, mpq is the position of the light-emitting plate, where m is the near end of the light-emitting plate and q is the far end of the light-emitting plate. A1np is the optical axis direction of the light source 101, and the light rays between the optical axis A1np and A1sq correspond to Figure 9The first curve L01 and the third curve L03 in it, the light rays between the optical axis A1np and A1m correspond to the second curve L02 and the fourth curve L04 in it. Assume that ∠qA1p = ∠pA1m = α, that is, first assume here that the first included angle is equal to the second included angle.

[0085] Also assume that ∠A1qp = θ. In △spq, pq = sp / sin(θ). In △A1sp, sp = A1p×sin(α). So pq = A1p×sin(α) / sin(θ).

[0086] In △mnp, mp = mn / sin(∠npm). For △A1pq, ∠npm = ∠pA1q + ∠pqA1 = α + θ.

[0087] So mp = mn / sin(α + θ).

[0088] In △mA1n, mn = A1m×sin(α).

[0089] So, mp = A1m×sin(α) / sin(α + θ).

[0090] So pq / mp = (A1p / A1m)×(sin(α + θ) / sin(θ)).

[0091] Simple reasoning can obtain that A1p > A1m, so A1p / A1m > 1.

[0092] Also obviously sin(α + θ) / sin(θ) > 1.

[0093] So pq / mp > 1, that is, pq > mp.

[0094] That is to say, in the case of ∠qA1p = ∠mA1p = α, the length of the light-emitting plate covered by the outgoing light rays corresponding to ∠qA1p (the length of the line segment pq) is greater than the length of the light-emitting plate covered by the outgoing light rays corresponding to ∠mA1p (the length of the line segment mp). That is, the length of the light-emitting plate covered by the light rays emitted from the first curve L01 and the third curve L03 of the lens 1 shown by Figures 5 to 7 is greater than the length of the light-emitting plate covered by the light rays emitted from the second curve L02 and the fourth curve L04 of the lens 1 shown by Figure 10 If it is assumed that the first included angle is equal to the second included angle, the light energy of the light rays corresponding to the light-emitting plate length pq and the light-emitting plate length mp is equal. And pq > mp, making the illuminance on the light-emitting plate length pq less than the illuminance on the light-emitting plate length mp. But in this embodiment, as shown by

[0095] As Figure 5 shown, Figure 10As shown, because the first included angle is greater than the second included angle, the emitted light rays are... Figures 5 to 7 The illuminance along the length pq of the light-emitting plate shown can be increased, resulting in more light energy in the far direction of the light-emitting plate, which is beneficial to improving the uniformity of illuminance on the entire light-emitting plate mpq.

[0096] like Figure 10 As shown, to facilitate demolding and easy processing, a third angle is formed between the first intersecting line L14 and the first vertical plane. The first vertical plane is perpendicular to the first surface 11, and the third angle ranges from 2° to 5°. Preferably, the third angle is 2°, 3°, 4°, or 5°.

[0097] like Figure 11 As shown, to facilitate demolding and easy processing, a fourth included angle is formed between the second intersecting line L25 and the second vertical plane. The second vertical plane is perpendicular to the first surface 11, and the fourth included angle is between 2° and 5°. Preferably, the fourth included angle is 2°, 3°, 4°, or 5°.

[0098] Of course, in the embodiment not shown in the figure, a third angle is formed between the first intersecting line L14 and the first vertical plane, the first vertical plane being perpendicular to the first surface, and the range of the third angle can be between 2° and 5°. Alternatively, a fourth angle is formed between the second intersecting line L25 and the second vertical plane, the second vertical plane being perpendicular to the first surface, and the range of the fourth angle can be between 2° and 5°.

[0099] like Figure 7 As shown, the reflective portion 30 includes a first arcuate surface 31 and a second arcuate surface 32 symmetrically arranged with respect to the central symmetry plane A0. The first arcuate surface 31 and the second arcuate surface 32 form a third intersection line L38 and a fourth intersection line L69 on the central symmetry plane A0. The first arcuate surface 31 and the second arcuate surface 32 together form the total internal reflection surface of the lens 1. This total internal reflection surface is a commonly used concept in the field of illumination optics, and the meaning of the total internal reflection surface will not be explained further in this application.

[0100] Reference Figure 7 Based on the technical effect that the first included angle is greater than the second included angle, it can be seen that increasing the light energy in the q direction at the far end of the light-emitting plate is beneficial to improving the uniformity of illuminance on the entire light-emitting plate mpq.

[0101] like Figure 7 As shown, the outgoing rays from the third intersection line L38 and the fourth intersection line L69 of the total reflection surface of lens 1 are both projected onto the light-emitting plate mq (i.e., Figure 7 Near the far end q of the mpq), the light energy in the direction of the far end q of the light-emitting plate mq can be increased to increase the illuminance of the far end q of the light-emitting plate mq, which in turn helps to improve the uniformity of the illuminance of the entire light-emitting plate mq.

[0102] The inventors discovered that, in order to achieve the goal of projecting the emitted light rays from the third intersection line L38 and the fourth intersection line L69 of the lens's total reflection surface to the vicinity of the far end q near the light-emitting plate mq, the two third intersection lines L38 and the fourth intersection line L69 of the lens have the following characteristics:

[0103] like Figure 10 As shown, the length of the third intersecting line L38 is greater than the length of the fourth intersecting line L69. The third intersecting line L38 intersects the first surface 11 at a third intersection point B3. The tangent line to the third intersecting line L38 drawn through the third intersection point B3 is defined as the first extension line L3v. The fourth intersecting line L69 intersects the first surface 11 at a fourth intersection point B4. The tangent line to the fourth intersecting line L69 drawn through the fourth intersection point B4 is defined as the second extension line L6u. The first extension line L3v forms a fifth angle with the center line L0, which is greater than or equal to 45°. Preferably, the fifth angle is 45°, 51°, 56°, or 60°. The second extension line L6u forms a sixth angle with the center line L0, which is less than or equal to 45°. Preferably, the sixth angle is 45°, 42°, 36°, or 30°. The point values ​​of the fifth and sixth included angles mentioned above enable the outgoing light rays at the third intersection line L38 and the fourth intersection line L69 of the total reflection surface of the lens to be projected to the vicinity of the far end q near the light-emitting plate mq, so that the outgoing light rays can better cover the light-emitting plate mq.

[0104] Specifically, the working principle of the emitted light at the third phase intersection line L38 on the total reflection surface is analyzed below:

[0105] like Figure 7 and Figure 10 As shown, to increase the illuminance at the far end q of the light-emitting plate mq, it is necessary to increase the projection of the light rays emitted from the lens onto the far end q of the light-emitting plate mq. Here, it is assumed that in practical applications, the length of the light-emitting plate mq (i.e., the length of line segment mq) is much larger than the size of the lens. The light source 101 can be simplified to a single central light spot A1. For the total internal reflection surface at the third intersection line L38, Figure 7 This illustrates the situation where the emitted ray B3h at point B3 does not intersect the midline L0. This helps to direct the emitted ray towards the far end q of the light-emitting plate mAq, thereby improving the uniformity of illuminance across the entire light-emitting plate mAq. Figure 7 It can be seen that ∠A1B3h is an obtuse angle, that is, ∠A1B3h > 90°. The specific value of ∠A1B3h is calculated as follows:

[0106] like Figures 5 to 7 As shown, hq is the external ray path of the lens after the outgoing ray B3h from point B3 is refracted by the second surface 12, and the angle between hq and the midline L0 is defined as δ2.

[0107] like Figure 11As shown, B3h is the ray path corresponding to the external ray path hq inside the lens, and the angle between line segment B3h and the midline L0 is defined as δ1. Figure 12 As shown, according to Fresnel's law of refraction, sin(δ1)=sin(δ2) / Rf, as previously assumed, Rf is a positive constant with a refractive index greater than 1 for the lens material.

[0108] like Figure 11 ∠A1B3h=∠A1B3w+∠wB3h. Here, we define B3w as parallel to the median L0, so ∠A1B3w=90°. Also, ∠wB3h=δ1, so ∠A1B3h=90°+δ1.

[0109] Assume line segment A1B3k is the angle bisector of ∠A1B3h, A1B3 is the incident ray at point 8, the starting point of the third intersection line L38, and B3h is the outgoing ray at point B3. A1B3 and B3h are symmetrical about B3k, such that B3k is also the normal to point B3. According to the preceding description, line segment B3v is a tangent to point B3, and line segment B3k is the normal to point B3, such that line segment B3v is perpendicular to line segment B3k. That is:

[0110] ∠vB3A1 + ∠A1B3k = 90°. Therefore, ∠vB3A1 = 90° - ∠A1B3k.

[0111] Since line segment 3k is the angle bisector of ∠A1B3h, ∠A1B3k = 0.5 × ∠A1B3h = 0.5 × (90° + δ1).

[0112] Therefore, ∠vB3A1=90°-∠A1B3k=90°-0.5×(90°+δ1)=0.5×(90°-δ1).

[0113] Line segment A1B3 lies within the first surface 11, therefore, according to the previous statement, line segment A1B3 is perpendicular to the median L0. Therefore, ∠vA1B3 = 90°. Since the sum of the three interior angles of a triangle is 180°, in △vB3A1,

[0114] ∠A1vB3+∠vB3A1=90°.

[0115] Therefore, ∠A1vB3=90°-∠vB3A1=90°-0.5×(90°-δ1)=0.5×(90°+δ1)>0.5×90°=45°.

[0116] Specifically, the working principle of the emitted light at the fourth phase intersection line L69 of total internal reflection is analyzed below:

[0117] To increase the illuminance at the far end q of the light-emitting plate mq, it is necessary to increase the projection of the light rays emitted from the lens onto the far end q of the light-emitting plate mq. Here, it is agreed that in practical applications, the length of the light-emitting plate mq (i.e., the length of line segment mq) is much larger than the size of the lens. The light source 101 can be simplified to a single central light spot A1. For the total internal reflection surface at the fourth intersection line L69, Figure 13 This illustrates the intersection of the emitted ray B4j at point B4 and the midline L0. This helps to direct the emitted ray towards the far end q of the light-emitting plate mAq, thereby improving the uniformity of illuminance across the entire light-emitting plate mAq. Figure 13 It can be seen that ∠A1B4j is an acute angle, that is, ∠A1B4j < 90°. The specific numerical calculation of ∠A1B4j is as follows:

[0118] like Figure 14 As shown, jr is the path of the light ray B4j emitted from point B4 after being refracted by the second surface 12 of the lens. The angle between jr and the midline L0 is defined as γ2.

[0119] like Figure 14 As shown, B4j is the ray path corresponding to the outgoing ray path jr inside the lens. Here, it is agreed that B4x is parallel to the median L0, so the angle between B4j and the median L0 is equivalent to the angle between B4j and B4x, i.e., ∠jB4x. Here, ∠jB4x is defined as γ1. For example... Figure 14 As shown, according to Fresnel's law of refraction, sin(γ1)=sin(γ2) / Rf, as previously assumed, Rf is a positive constant with a refractive index greater than 1 for the lens material.

[0120] like Figure 14 As shown, ∠A1B4j=∠A1B4x-∠jB4x. Since B4x is parallel to the median L0, ∠A1B4x=90°. Also, ∠jB4x=γ1, so ∠A1B4j=90-γ1.

[0121] Assume line segment B4i is the angle bisector of ∠A1B4j, A1B4 is the incident ray at point B4, and B4j is the outgoing ray at point B4. A1B4 and B4j are symmetrical about B4i, such that B4i is also the normal to point B4. According to the preceding description, line segment B4u is a tangent to point B4, and line segment B4i is the normal to point B4, such that line segment B4u is perpendicular to line segment B4i. That is:

[0122] ∠uB4A1+∠A1B4i=90°, therefore ∠uB4A1=90°-∠A1B4i.

[0123] Line segment B4i is the angle bisector of ∠A1B4j, and ∠A1B4i = 0.5 × ∠A1B4j = 0.5 × (90° - γ1).

[0124] Therefore, ∠uB4A1=90°-∠A1B4i=90°-0.5×(90°-γ1)=0.5×(90°+γ1).

[0125] Line segment B4A1 lies within the first surface 11, therefore, according to the previous statement, line segment B4A1 is perpendicular to the median L0. Therefore, ∠uA1B4 = 90°. Since the sum of the three interior angles of a triangle is 180°, in △uB4A1...

[0126] ∠A1uB4+∠uB4A1=90°.

[0127] Therefore, ∠A1uB4=90°-∠uB4A1=90°-0.5×(90°+γ1)=0.5×(90°-γ1)<0.5×90°=45°.

[0128] like Figure 14 , Figure 14 as well as Figure 9 As shown, the reflective part 30 includes a first arcuate surface 31 and a second arcuate surface 32 symmetrically arranged with respect to the central symmetry plane A0. The first arcuate surface 31 and the second arcuate surface 32 form a third intersection line L38 and a fourth intersection line L69 on the central symmetry plane A0. The fourth intersection line L69 includes a first intersection segment L67 and a second intersection segment L79 connected to the first intersection segment L67. The first intersection segment L67 is closer to the first surface 11 than the second intersection segment L79. The length of the third intersection line L38 is greater than the length of the first intersection segment L67. For ease of design and demolding, the second intersection segment L79 is parallel to the centerline L0.

[0129] Of course, in the embodiment not shown in the figure, the second intersection segment L79 is inclined to the center line L0.

[0130] like Figure 15 As shown, in order to achieve eccentric astigmatism by the lens, and to make the light rays that hit the near end and far end of the light-emitting plate as uniform as possible, the third intersection line L38 intersects the second surface 12 at the fifth intersection point 8 (i.e., the aforementioned starting point 8), and the second intersection line segment L79 intersects the second surface 12 at the sixth intersection point 9. The distance between the sixth intersection point 9 and the center line L0 is less than the distance between the fifth intersection point and the center line L0.

[0131] like Figure 15 As shown, to facilitate placing the third phase intersection line L38 and the first phase intersection line L14 on the same side of the center line L0, the fourth phase intersection line L69 and the second phase intersection line L25 are also placed on the same side of the center line L0. This allows for more light energy in the far-end direction of the light-emitting plate, which helps to increase illuminance and makes the illuminance of the light-emitting plate more uniform along its length.

[0132] This application also provides a lighting device, such as Figure 15As shown, the lighting device includes a light source 101 and a lens 1, the lens being the aforementioned lens. Because the aforementioned lens can solve the problem in related technologies where the light path concentrates through the lens and passes through the central area of ​​the light-emitting plate, resulting in uneven illuminance on the light-emitting plate, the lighting device including this lens can solve the same technical problem. It should be noted that the lighting device in this embodiment is a skylight, and the light-emitting plate is a Rayleigh diffuser. Of course, in embodiments not shown in the figure, the lighting device can also be a grille light, a wall washer light, a countertop light, or a kitchen / bathroom light. The light-emitting plate can also be a light-mixing plate, a light-emitting cover, or a light-emitting panel.

[0133] like Figure 15 As shown, the lighting device also includes a housing 40 and a light-emitting plate 60. The light source 101 and lens 1 are both installed inside the housing 40. The housing 40 includes a top plate 41 and a surrounding plate 42. The first end of the surrounding plate 42 is connected to the top plate 41, and the second end of the surrounding plate 42 forms a light-emitting port. The light-emitting plate 60 is positioned at the light-emitting port. The top plate 41 is parallel to the plane containing the light-emitting port. The centerline of the surrounding plate 42 is inclined to the top plate 41. The light source 101 is positioned at the acute angle between the surrounding plate 42 and the top plate 41. This allows the light source 101 to emit light at an angle, thereby minimizing the housing thickness while ensuring the optical path of the light reaching the light-emitting plate.

[0134] like Figure 15 As shown, the lighting device also includes a housing 40. The light source 101 and lens 1 are both installed inside the housing 40. The vertical axis C1 is defined as the straight line passing through the center light spot A1 of the light source 101 and perpendicular to the ground. The principal ray C2 of the emitted light beam is defined as the line from the center light spot A1 of the light source 101 passing through the housing 40. Figure 15 (As shown in the diagram). A seventh angle θ is formed between the vertical axis C1 and the principal ray C2 of the emitted beam, and the seventh angle θ ranges from 45° to 80°. The seventh angle θ, located within the range of 45° to 80°, allows the light source 101 to be reasonably installed within the housing 40, thereby shortening the length of the vertical axis C1 and thinning the housing 40, which helps reduce the manufacturing cost of the lighting equipment. The seventh angle θ is preferably between 45° and 60°, and is preferably 45°, 60°, 72°, or 80°.

[0135] It should be noted that the principal ray of the emitted beam mentioned above refers to the direction in which the maximum light intensity value of the emitted beam from the light source and lens is located. The reason for using the direction of the maximum light intensity value to define the direction of the principal ray is that the emitted beam has the strongest light projection capability in the direction of maximum light intensity, which can be used to characterize the projection direction of the emitted beam from the light source and lens. The maximum light intensity value can be measured by a photometer.

[0136] The inventors discovered that the position of the light source 101 within the housing 40 affects the path of the irradiated light, resulting in varying irradiation ranges covering the light-emitting plate. A detailed analysis follows: Figure 5 In the diagram, W1 is the front wall side, W2 is the rear wall side, W3 is the ground side, and W4 is the ceiling side.

[0137] As θ increases, the outgoing light rays will generally veer towards Figure 7 The front wall moves to the side, and the corresponding outgoing light falls on the wall. Figure 13 The proportion of the ground side will decrease. Therefore, θ has an optimal upper limit value. max Preferably, θ max ≤80°.

[0138] For example Figures 13 to 15 As shown, assume that the direction of A1p is the direction of the principal ray of the outgoing beam. ∠fA1p = θ. A1m and A1q are the directions of the boundary rays of the outgoing beam. ∠mA1p = α, ∠pA1q = β. Here, α and β are constant positive constants. In △fA1m, fm = A1f × tan(∠fA1m) = A1f × tan(∠fA1p - ∠mA1p) = A1f × tan(θ - α). In △fA1q, fq = A1f × tan(∠fA1q) = A1f × tan(∠fA1p + ∠pA1q) = A1f × tan(θ + β).

[0139] Therefore, the illumination range that the light beam emitted from the light source and lens can cover, that is, the illumination range of the light-emitting plate that the light beam emitted from the light source and lens can cover: mq=fq-fm=A1f×(tan(θ+β)-tan(θ-α)).

[0140] Mathematical differentiation of mq with respect to θ:

[0141] d(mq) / dθ=A1f×((1 / cos 2 (θ+β))-(1 / cos 2 (θ-α)))

[0142] Furthermore, for this application, it is agreed that only the following application scenarios will be considered:

[0143] 0°<θ-α<90°

[0144] 0°<θ+β<90°.

[0145] It is also obvious that θ-α<θ+β, so: 0°<θ-α<θ+β<90°.

[0146] So cos(θ-α)>cos(θ+β), so (1 / cos 2 (θ-α))<(1 / cos 2 (θ+β).

[0147] Therefore ((1 / cos 2 (θ+β))-(1 / cos 2 (θ-α)))>0.

[0148] Therefore, d(mq) / dθ > 0, meaning that as θ increases, mq also increases accordingly. This indicates that a larger θ value is beneficial for increasing the illumination range of the light-emitting plate by the light beam emitted from the light source and lens. It should be noted that in the actual application of this application, the illumination range mq of the light-emitting plate is relatively fixed, while a larger θ corresponds to a smaller A1f. A1f corresponds to the thickness of the housing 40. In other words, a larger θ value is beneficial for reducing the thickness of the housing 40. Therefore, there is a preferred lower limit θ value. min Preferably, θ min ≥45°.

[0149] like Figures 13 to 15 , Figures 16 to 21 and Figures 16 to 21 As shown, the reflective portion 30 includes a first arcuate surface 31 and a second arcuate surface 32 symmetrically arranged with respect to the central symmetry plane A0. The first arcuate surface 31 and the second arcuate surface 32 form a third intersection line L38 and a fourth intersection line L69 on the central symmetry plane A0. The third intersection line L38 is closer to the top plate 41 than the fourth intersection line L69, and the inner side of the third intersection line L38 faces the light-emitting plate 60. In this way, it can be ensured that the reflective portion 30 where the third intersection line L38 is located can effectively perform total internal reflection.

[0150] The inventors discovered that, because the light source 101 needs to direct light to the edge of the Rayleigh diffuser to achieve uniform light emission and avoid obvious dark areas, when the light is directed to the edge of the Rayleigh diffuser, some light inevitably shines onto the inner surface of the housing adjacent to the Rayleigh diffuser. This generates a large amount of stray light that enters the Rayleigh diffuser, resulting in harmful reflections inside the housing and affecting the light output of the lighting equipment.

[0151] To solve the above problems, such as Figures 16 to 21 , Figure 18 As shown, the lighting device in this embodiment also includes an anti-reflection structure 50 disposed within the housing 40, located on one side of the path of the light emitted from the lens 1. The anti-reflection structure 50 is used to absorb stray light in the incident light, reducing the reflection of stray light onto the light-emitting plate. This significantly reduces harmful stray light or harmful reflections generated within the housing 40, effectively ensuring the light emission effect of the lighting device. Specifically, the housing 40 includes a top plate 41 and surrounding plates 42 connected around the top plate 41. The anti-reflection structure 50 is disposed on the top plate 41, or alternatively, on the surrounding plates 42.

[0152] like Figure 16 and Figure 16 As shown, the lighting device also includes a housing 40. The light source 101 and lens 1 are both installed within the housing 40. The housing 40 includes a surrounding plate 42 and a top plate 41 connected to one end of the surrounding plate 42. The centerline of the surrounding plate 42 is inclined to the top plate 41. An anti-reflection structure 50 is disposed on the light-receiving area of ​​the inner wall of the surrounding plate 42. It should be noted that the aforementioned light-receiving area refers to the area where a portion of the light emitted from the light source can directly reach the inner wall of the surrounding plate. Of course, the anti-reflection structure 50 can be disposed in other areas of the inner wall of the surrounding plate besides the aforementioned area. It can also be disposed on the inner wall of the top plate.

[0153] Furthermore, the anti-reflection structure 50, located on the light-receiving area of ​​the inner wall of the enclosure 42, can eliminate harmful reflections without requiring the housing to be enlarged to avoid harmful reflections, while also meeting the mass production requirements for miniaturization and modularization of lighting equipment.

[0154] Specifically, such as Figure 16 As shown, the enclosure 42 is sequentially connected to a first side plate, a second side plate, a third side plate, and a fourth side plate. All four side plates are connected to the top plate 41. The first and third side plates are parallel and are both parallelogram structures. The second and fourth side plates are also parallel. The distance between the light source 101 and the second side plate is less than the distance between the light source 101 and the fourth side plate. The first and third side plates are parallelograms, while the second and fourth side plates are rectangles. This makes the vertical cross-section of the enclosure 42 a parallelogram, effectively increasing the optical distance between the light source 101 and the light outlet. Furthermore, this shape facilitates subsequent assembly. An anti-reflection structure 50 is provided on the fourth side plate. Thus, the fourth side plate corresponds to the light emitted from the light source 101, allowing the anti-reflection structure 50 on the fourth side plate to directly absorb some of the light, reducing stray light reflections to the first, second, or third side plates.

[0155] like Figure 17 As shown, the anti-reflective structure 50 includes a honeycomb layer. Compared to ordinary sheet materials such as channel steel, the interior of the honeycomb layer can refract more stray light, effectively capturing and absorbing stray light.

[0156] like Figure 8 and Figure 9 As shown, the honeycomb layer comprises multiple interconnected cylindrical bodies 51. Each cylindrical body 51 is a regular hexagonal prism, and multiple regular hexagonal prisms are interconnected by overlapping boundaries to form a honeycomb layer. It should be noted that the shape of each cylindrical body is not limited to a regular hexagonal prism; it can also be a quadrilateral prism, a pentagonal prism, a heptagonal prism, or more.

[0157] like Figure 13 As shown, to better absorb stray light in the incident light, the honeycomb layer includes multiple interconnected cylinders 51, each cylinder 51 having its axis perpendicular to the inner wall of the housing 40. There is a spacing L between adjacent cylinders 51, and the ratio of the height H of each cylinder 51 to the spacing L is greater than 1. To reduce height and cost, the height H is chosen to be small, so the corresponding spacing L is also chosen to be small. In application, a smaller spacing L is chosen, for example, L = 2 mm. All surfaces of the antireflective structure 50 are coated with a black layer. The inner wall of the housing 40 is preferably the inner wall of the top plate 41 of the housing 40. Of course, in embodiments not shown in the figure, the inner wall of the housing can also be the inner wall of the enclosure plate 42.

[0158] Specifically, the principle by which each cylinder 51 absorbs stray light from the incident light is as follows:

[0159] Figure 8 The rectangle a2b2c2d2 represents the cross-section of the regular hexagonal prism along the height H direction. The central light spot A1 of light source 101 represents the installation position of the lighting equipment and the starting point of the light. Figures 20 to 22 In the diagram, A1a3 represents the light rays projected onto the inner wall of cylinder 51. After entering the hexagonal column through the light inlet a2b2, most of the light is absorbed by the black inner wall. The remaining small portion of the light is reflected at point a3, forming a reflected beam with a certain divergence angle. The central ray of the reflected beam is a3c3. a3b3 and a3d3 are the two boundary rays of the reflected beam. Figure 20 As shown, the reflected light beam will travel towards the bottom c2d2 direction of the regular hexagonal prism. Under the influence of the aforementioned relationship H / L > 1, the reflected light beam will continue to be incident on the inner wall of the regular hexagonal prism one or more times. After one or more reflections, the incident light beam A1a3 will be absorbed by the black inner wall surface of the regular hexagonal prism and will not be reflected away.

[0160] like Figure 21 As shown, to ensure high structural strength, the anti-reflection structure 50 is made of metal. This metal component prevents the anti-reflection structure 50 from deforming, avoiding interference with normal incident light and ensuring its effectiveness in absorbing some of the incident light.

[0161] like Figure 20 and Figure 23 Figure 23 Figure 24 Figures 24 to 26 Figure 26 Figure 25 Figure 26 Figure 22 Figure 20 Figure 21As shown, the lighting device also includes a housing 40 and a light-emitting plate 60. The light source 101 and lens 1 are both installed within the housing 40, and the light-emitting plate 60 is located within the housing 40, positioned along the path of the light emitted from the lens 1. A microstructured film layer is bonded to the side of the light-emitting plate 60 facing the light source 101. This film layer has a microstructured film with light-point blocking capabilities. Preferably, the aforementioned film layer is a Bright View film (high-brightness screen diffusion film) or a Luminit film (optical thin film) from the United States. The Bright View film is bonded to the side of the light-emitting plate facing the light source using a film bonding process. Practical verification has shown that the light-emitting plate with the microstructured film possessing light-point blocking capabilities effectively hides the light source and lens, significantly improving the concealment effect and visual appearance.

[0162] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0163] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0164] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0165] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lighting device, comprising a light source (101), characterized in that, The lighting device further includes a housing (40) and a light-emitting plate (60). The light source (101) is installed inside the housing (40). The housing (40) includes a top plate (41) and a surrounding plate (42). The first end of the surrounding plate (42) is connected to the top plate (41), and the second end of the surrounding plate (42) forms a light-emitting port. The light-emitting plate (60) is disposed at the light-emitting port. The centerline of the enclosure (42) is inclined to the top plate (41); the light-emitting plate (60) is a Rayleigh scattering plate, and the light-emitting plate (60) is located on the path of the light emitted by the light source (101); the straight line passing through the center light point A1 of the light source (101) and perpendicular to the ground is set as the vertical axis C1; the center light point A1 of the light source (101) is set to form the main ray of the emitted beam C2 when it passes through the housing (40); the vertical axis C1 and the main ray of the emitted beam C2 form a seventh angle, and the range of the seventh angle is between 45° and 80°; The lighting device further includes a lens (1) for eccentrically diffused light from the light source; The lighting device also includes an anti-reflection structure (50), which is disposed on the light-receiving area of ​​the inner wall of the enclosure (42) and is located on one side of the path of the light emitted by the light source (101). The antireflection structure (50) includes a honeycomb layer; and / or the antireflection structure (50) is a metal component.

2. The lighting device according to claim 1, characterized in that, The enclosure (42) includes a first side plate, a second side plate, a third side plate and a fourth side plate connected in sequence. The first side plate, the second side plate, the third side plate and the fourth side plate are all connected to the top plate (41). The first side plate and the third side plate are arranged in parallel, the second side plate and the fourth side plate are arranged in parallel, and the distance between the light source (101) and the second side plate is less than the distance between the light source (101) and the fourth side plate.

3. The lighting device according to claim 2, characterized in that, The first side plate and the third side plate are parallelograms, while the second side plate and the fourth side plate are rectangles.

4. The lighting device according to claim 1, characterized in that, The lens has a symmetrical structure and a central symmetry plane A0.

5. The lighting device according to claim 1, characterized in that, The vertical projection of the light source (101) on the horizontal plane is outside the vertical projection of the light-emitting plate (60) on the horizontal plane, and the light source (101) generates asymmetrical outgoing light rays through the lens (1).

6. The lighting device according to claim 1, characterized in that, The centerline of the enclosure (42) is inclined to the top plate (41), and the light source (101) is located at the acute angle between the enclosure (42) and the top plate (41).

7. The lighting device according to claim 1, characterized in that, The light-emitting plate (60) has a microstructured film layer attached to the side facing the light source (101).

8. The lighting device according to claim 1, characterized in that, The enclosure (42) includes a first side plate, a second side plate, a third side plate and a fourth side plate connected in sequence, and the anti-reflection structure (50) is disposed on the fourth side plate.

9. The lighting device according to claim 1, characterized in that, The honeycomb layer includes a plurality of interconnected cylinders (51), with a spacing L between two adjacent cylinders (51), and the ratio of the height H of each cylinder (51) to the spacing L is greater than 1; and / or, the honeycomb layer includes a plurality of interconnected cylinders (51), with the axis of each cylinder (51) perpendicular to the inner wall of the housing (40).

10. The lighting device according to claim 1, characterized in that, The lighting equipment includes skylights, grille lights, wall washer lights, countertop lights, or kitchen and bathroom lights.

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