Lens and lighting device
By using a symmetrical lens design, light is directed from the cylindrical sidewall to the light-emitting part through the reflector, which solves the problem of uneven illumination on the light-emitting plate in multi-source lens systems, improves the visual experience, and reduces the thickness of the luminaire.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- QINGDAO YEELINK INFORMATION TECH
- Filing Date
- 2022-07-18
- Publication Date
- 2026-07-24
Smart Images
Figure CN117889406B_ABST
Abstract
Description
[0001] This application is a divisional application of the patent application filed on July 18, 2022, with application number 202210843549.1 and entitled "Lens and Lighting Device".
[0002] Related applications
[0003] This application claims priority to Chinese patent application filed on September 16, 2021, application number 202111089503.7, entitled "Lens and Lighting Device Having the Thereof", the entire contents of which are incorporated herein by reference. Technical Field
[0004] This invention relates to the field of lighting technology, and more specifically, to a lens and a lighting device. Background Technology
[0005] With social progress and improved living standards, people are paying more and more attention to quality of life and pursuing a healthy living environment. It is against this backdrop that a new type of lighting fixture has emerged in the home lighting industry in recent years – the sky light, also known as the blue sky lamp. The main characteristics of this sky-simulating light fixture are its ability to simulate the visual effect of the sky and its ability to approximate the angled illumination of sunlight into the room.
[0006] To achieve the above effects, there are currently two technical approaches: The first approach separates the simulation of the sky's visual effect from the simulation of the oblique illumination. The oblique illumination is achieved using a separate set of white light sources, while the simulation of the sky's visual effect utilizes a set of colored light sources to achieve a sky-blue color through color matching, and then uses optical design to evenly illuminate the light-emitting plate. The second approach uses optical design to allow a set of white light sources to obliquely illuminate a light-emitting plate, achieving a sky-blue visual effect on the plate while ensuring the oblique emission of light, and the emitted light is white.
[0007] For the second technical route mentioned above, there are several main systems: the first is a reflective optical path system that combines multiple light sources with lenses and reflectors; the second is a direct-lit optical path system that combines multiple light sources with lenses; and the third is a reflective optical path system that combines a single light source with a reflector.
[0008] In related technologies, a direct-lit optical path system using multiple light sources combined with lenses can be used to create lamps that simulate the visual effect of a blue sky. However, the light paths of multiple light sources pass through the central area of the light-emitting plate via lenses, resulting in uneven illumination on the light-emitting plate. This leads to a poor visual experience for users in the direction of the light path, and the overall size of the lamp is also relatively thick. Summary of the Invention
[0009] The main objective of this invention is to provide a lens and an illumination device to solve the problem in related technologies where the light path passes through the lens concentrated in the middle area of the light-emitting plate, resulting in uneven illumination on the light-emitting plate.
[0010] To achieve the above objectives, according to one aspect of the present invention, a lens is provided. The lens has a symmetrical structure and a central symmetry plane A0. The lens includes: a lens body; a light-inlet portion disposed on a first surface of the lens body and including a mounting recess recessed into the lens body to accommodate a light source, the mounting recess including a bottom wall and a cylindrical sidewall connected to the edge of the bottom wall; a light-outlet portion disposed on a second surface of the lens, the second surface being parallel to the first surface, wherein the bottom wall includes an outer ring portion and a central portion located inside the outer ring portion, the outer ring portion protruding in the direction of the light-inlet portion, and the central portion protruding in the direction of the light-outlet portion; and a reflective portion disposed on a side surface of the lens body and located between the first and second surfaces.
[0011] Furthermore, the outer ring is directly connected to the central part, and the outer ring is composed of multiple curved surfaces sequentially spliced together along the circumference of the cylindrical sidewall.
[0012] Furthermore, the outer ring portion includes a plurality of annular portions protruding toward the light-inlet portion, the plurality of annular portions being connected sequentially from the cylindrical sidewall to the center portion, and / or the center portion includes a plurality of protrusions protruding toward the light-outlet portion, the plurality of protrusions being connected sequentially along the circumference of the outer ring portion.
[0013] According to another aspect of the present invention, a lens is provided, the lens having a symmetrical structure and a central symmetry plane A0, the lens comprising: a lens body; a light-entering portion disposed on a first surface of the lens body and including a mounting recess recessed into the lens body and accommodating a light source, the mounting recess including a bottom wall; a light-exiting portion disposed on a second surface of the lens, the second surface being parallel to the first surface; and a reflective portion disposed on a side surface of the lens body and located between the first and second surfaces; the center of the light source forms a central light spot A1 at the opening of the mounting recess, the bottom wall including a midpoint A2, and the line connecting the midpoint A2 and the central light spot A1 is defined as the midline L0; the reflective portion includes a first arcuate surface and a second arcuate surface symmetrically disposed with respect to the central symmetry plane A0, the first arcuate surface... The first surface and the second arc-shaped surface form a third intersection line L38 and a fourth intersection line L69 on the central symmetry plane A0. The third intersection line L38 intersects the first surface at a third intersection point B3. The tangent line to the third intersection line L38 through the third intersection point B3 is defined as the first extension line L3v. The first extension line L3v forms a fifth angle with the center line L0, which is greater than or equal to 45°. The fourth intersection line L69 intersects the first surface at a fourth intersection point B4. The tangent line to the fourth intersection line L69 through the fourth intersection point B4 is defined as the second extension line L6u. The second extension line L6u forms a sixth angle with the center line L0, which is less than or equal to 45°. Alternatively, 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 having a symmetrical structure and a central symmetry plane A0, the lens comprising: a lens body; a light-entering portion disposed on a first surface of the lens body and including a mounting recess recessed into the lens body and accommodating a light source, the mounting recess including a bottom wall and a cylindrical sidewall connected to the edge of the bottom wall; a light-exiting portion disposed on a second surface of the lens, the bottom wall including a midpoint A2; a reflecting portion disposed on a side surface of the lens body and located between the first and second surfaces; the center of the light source forming a central light spot A1 at the opening of the mounting recess, the line connecting the midpoint A2 and the central light spot A1 being defined as the centerline L0; the cylindrical sidewall including a first light spot A1 symmetrically disposed with respect to the central symmetry plane A0. The first and second sidewalls form a first intersecting line L14 and a second intersecting line L25 within the central symmetry plane A0. The bottom wall forms a first curve L01 and a second curve L02 on both sides of the centerline L0 within the central symmetry plane A0. The first curve L01 intersects the first intersecting 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 angle is formed between the centerline L0 and the first straight line L1. The second curve L02 intersects the second intersecting 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 angle is formed between the centerline L0 and the second straight line L2. The first angle is greater than the second angle.
[0015] Furthermore, 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 third angle being between 2° and 5°; and / or, 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 fourth angle being between 2° and 5°.
[0016] Furthermore, the reflective part includes a first arc-shaped surface and a second arc-shaped surface symmetrically arranged with respect to the central symmetry plane A0. The first arc-shaped surface and the second arc-shaped 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 located on the same side of the center line L0, and the fourth intersection line L69 and the second intersection line L25 are located on the same side of the center line L0.
[0017] Further, the fourth intersection line L69 includes a first intersection line segment L67 and a second intersection line segment L79 connected to the first intersection line segment L67; wherein, the first intersection line segment L67 is closer to the first surface than the second intersection line segment L79, and / or the length of the third intersection line L38 is greater than the length of the first intersection line segment L67, and / or the second intersection line segment L79 is parallel to or inclined to the center line L0, and / or the third intersection line L38 intersects the second surface at a fifth intersection point, the second intersection line segment L79 intersects the second surface at a sixth intersection point, and the distance between the sixth intersection point and the center line L0 is less than the distance between the fifth intersection point and the center line L0. According to another aspect of the present invention, a lighting device is provided, including a light source and a lens, the lens being the lens described above.
[0018] Furthermore, the lighting device also includes a housing and a light-emitting plate. The housing includes a top plate and has a light-emitting port. The light-emitting plate is arranged at the light-emitting port. The light source and lens are installed inside the housing. The reflective part includes a first arc-shaped surface and a second arc-shaped surface symmetrically arranged with respect to the central symmetry plane A0. The first arc-shaped surface and the second arc-shaped surface 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 than the fourth intersection line L69. The inner side of the third intersection line L38 faces the light-emitting plate.
[0019] Furthermore, the light-emitting plate is a Rayleigh diffuser plate, and the light-emitting plate is located in the path of the light emitted from the light source; and / or, the lighting equipment includes skylights, grille lights, wall washer lights, table lights, or kitchen and bathroom lights.
[0020] According to another aspect of the present invention, a lighting device is provided, 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 inside the housing. The housing includes a top plate and a surrounding plate. A first end of the surrounding plate is connected to the top plate, and a second end of the surrounding plate forms a light-emitting port. The light-emitting plate is disposed at the light-emitting port. 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. The light source generates asymmetrical emitted light rays through the lens.
[0021] Furthermore, the lens has a symmetrical structure and a central symmetry plane A0.
[0022] According to another aspect of the present invention, a lighting device is provided, including a light source, a housing and a light-emitting plate, the light source being installed inside the housing, the housing including a top plate and a surrounding plate, a first end of the surrounding plate being connected to the top plate, a second end of the surrounding plate forming a light-emitting port, and the light-emitting plate being disposed at the light-emitting port, wherein a straight line passing through the center light spot A1 of the light source and perpendicular to the ground is defined as the vertical axis C1, and the center light spot A1 of the light source is defined as forming a principal ray C2 of the emitted light beam when passing through the housing, and a seventh angle is formed between the vertical axis C1 and the principal ray C2 of the emitted light beam, the seventh angle being between 45° and 80°.
[0023] Furthermore, the enclosure includes a first side panel, a second side panel, a third side panel, and a fourth side panel connected in sequence. The first side panel, the second side panel, the third side panel, and the fourth side panel are all connected to the top panel. The first side panel and the third side panel are arranged in parallel, and the second side panel and the fourth side panel are arranged in parallel. The distance between the light source and the second side panel is less than the distance between the light source and the fourth side panel.
[0024] Furthermore, the first and third side panels are parallelograms, while the second and fourth side panels are rectangles.
[0025] According to another aspect of the present invention, a lighting device is provided, including a light source, the lighting device further including a housing and a light-emitting plate, the light source being installed inside the housing, the housing including a top plate and a surrounding plate, a first end of the surrounding plate being connected to the top plate, a second end of the surrounding plate forming a light-emitting port, the light-emitting plate being disposed at the light-emitting port, the centerline of the surrounding plate being inclined to the top plate, and the light source being disposed at the acute angle between the surrounding plate and the top plate.
[0026] Furthermore, the light-emitting plate is a Rayleigh scattering plate, and the light-emitting plate is located on the path of the light emitted from the light source.
[0027] Furthermore, a microstructured film layer is attached to the side of the light-emitting plate facing the light source.
[0028] Furthermore, the lighting equipment also includes lenses, which are used to diffuse light from the light source in an off-center manner.
[0029] According to another aspect of the present invention, a lighting device is provided, including a light source, a housing and a light-emitting plate, the light source being installed inside the housing, the housing including a top plate and a surrounding plate, a first end of the surrounding plate being connected to the top plate, a second end of the surrounding plate forming a light-emitting port, the light-emitting plate being disposed at the light-emitting port, the light-emitting plate including a Rayleigh diffuser, and the lighting device further including an anti-reflection structure.
[0030] Furthermore, the anti-reflection structure is disposed on the light-receiving area of the inner wall of the enclosure, and / or the anti-reflection structure is located on one side of the path of the light emitted from the light source, and / or the anti-reflection structure includes a honeycomb layer, and / or the anti-reflection structure is a metal component.
[0031] Furthermore, the enclosure includes a first side panel, a second side panel, a third side panel, and a fourth side panel connected in sequence. The first side panel, the second side panel, the third side panel, and the fourth side panel are all connected to the top panel. The first side panel and the third side panel are arranged in parallel, and the second side panel and the fourth side panel are arranged in parallel. The distance between the light source and the second side panel is less than the distance between the light source and the fourth side panel. The anti-reflection structure is arranged on the fourth side panel.
[0032] Furthermore, the honeycomb layer includes multiple interconnected cylinders, with a spacing L between two 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 multiple interconnected cylinders, with the axis of each cylinder perpendicular to the inner wall of the shell.
[0033] Furthermore, lighting equipment includes skylights, grille lights, wall washer lights, countertop lights, or kitchen and bathroom lights.
[0034] The lens using the technical solution of this invention has a symmetrical structure and a central symmetry plane A0. The lens includes a lens body, a light-entering portion, a light-exiting portion, and a reflective portion. The light-entering portion is disposed on a first surface of the lens body and includes a mounting recess recessed into the lens body to accommodate a light source. The mounting recess includes a bottom wall and a cylindrical sidewall connected to the edge of the bottom wall. The light-exiting portion is disposed on a second surface of the lens, which is parallel to the first surface. The bottom wall includes an outer ring portion and a central portion located inside the outer ring portion. The outer ring portion protrudes towards the light-entering portion, and the central portion protrudes towards the light-exiting portion. The reflective portion is disposed on a side surface of the lens body and located between the first and second surfaces. The bottom wall of the lens cooperates with the light source. The light emitted from the light source is redistributed as it passes through the central portion protruding towards the light-emitting section, causing the beam illuminating the central portion to diverge. This generates an asymmetrical emitted light beam. This asymmetrical emitted light beam passes through the central region of the light-emitting plate, thereby reducing the illuminance value in the central region of the light-emitting plate. This improves the uniformity of illuminance on the light-emitting plate, providing the user with a better visual experience along the light path. Therefore, the technical solution of this application effectively solves the problem in related technologies where the light path is concentrated through the central region of the light-emitting plate via the lens, resulting in uneven illuminance on the light-emitting plate. The aforementioned reflective portion reflects light incident from the cylindrical sidewall to the light-emitting section, ensuring that all light incident from the cylindrical sidewall exits from the light-emitting section, avoiding light loss caused by direct light emission from the surface where the reflective portion is located. Attached Figure Description
[0035] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:
[0036] Figure 1 A simplified diagram of a structure in the related art, showing a light source shining through a lens onto a Ruili heat sink, is shown.
[0037] Figure 2 It shows Figure 1 A diagram illustrating the effect of light passing through a lens from a light source;
[0038] Figure 3 It shows Figure 1A perspective diagram of the lens;
[0039] Figure 4 A top view schematic diagram of an embodiment of a lens according to the present invention is shown;
[0040] Figure 5 It shows Figure 4 A top view of the lens when it is divided by the central plane of symmetry A0;
[0041] Figure 6 It shows Figure 4 A schematic diagram of the three-dimensional structure of the lens after it has been divided by the central symmetry plane A0;
[0042] Figure 7 It shows Figure 6 A front view schematic diagram of the lens after it has been divided by the central symmetry plane A0;
[0043] Figure 8 It shows Figure 4 A simplified diagram of the structure on which the lens emits light from the light source onto the Ruili heat sink.
[0044] Figure 9 It shows Figure 8 A diagram illustrating the effect of light emanating from a light source through a lens;
[0045] Figure 10 It shows Figure 4 A diagram illustrating the working principle of beam divergence at the center of a lens;
[0046] Figure 11 It shows Figure 4 A schematic diagram illustrating the working principle of a lens where the first included angle is greater than the second included angle;
[0047] Figure 12 It shows Figure 4 A schematic diagram of the path of light rays emitted from the reflective part of a lens;
[0048] Figure 13 It shows in Figure 4 A schematic diagram showing the first and second extension lines on the reflecting part of the lens;
[0049] Figure 14 It shows Figure 4 A schematic diagram illustrating the working principle at the third phase intersection of the lens;
[0050] Figure 15 It shows Figure 4 A schematic diagram illustrating the working principle at the fourth phase intersection of the lens;
[0051] Figure 16 It shows Figure 4 A schematic diagram illustrating the working principle of the seventh included angle of the lens;
[0052] Figure 17 It shows Figure 4 A simplified diagram illustrating the working principle of the seventh included angle of the lens;
[0053] Figure 18 It shows Figure 17 The local distribution diagram of the intensity of the outgoing 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 is shown;
[0055] Figure 20 It shows Figure 19 A cross-sectional schematic diagram of the lighting equipment;
[0056] Figure 21 It shows Figure 19 A cross-sectional view of the lighting equipment from another angle;
[0057] Figure 22 It shows Figure 19 A three-dimensional structural diagram of the anti-reflection structure of a lighting device;
[0058] Figure 23 It shows Figure 20 A partial schematic diagram of the anti-reflection structure;
[0059] Figure 24 It shows Figure 20 A three-dimensional structural diagram of the anti-reflection structure cylinder;
[0060] Figure 25 It shows Figure 19 A schematic diagram illustrating the working principle of the anti-reflection structure of a lighting device; and
[0061] Figure 26 It shows Figure 25 A partial schematic diagram illustrating the working principle of the anti-reflection structure.
[0062] The above figures 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; 212. Center; 22. Cylindrical sidewall; 221. First sidewall; 222. Second sidewall; 30. Reflecting part; 31. First arcuate surface; 32. Second arcuate surface; 40. Housing; 41. Top plate; 42. Enclosure; 50. Anti-reflection structure; 51. Cylindrical body; 60. Light-emitting plate. Detailed Implementation
[0064] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0065] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" 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 arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0067] like Figures 4 to 9 As shown, the lens has a symmetrical structure and a central symmetry plane A0. The lens includes a lens body 10, a light-entering part, a light-exiting part, and a reflective part 30. The light-entering part is disposed on the first surface 11 of the lens body 10 and includes a mounting recess 20 recessed into the lens body 10 to accommodate a light source 101. The mounting recess 20 includes a bottom wall 21 and a cylindrical sidewall 22 connected to the edge of the bottom wall 21. The light-exiting part is disposed on the second surface 12 of the lens, which is parallel to the first surface 11. 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 towards the light-entering part, and the central portion 212 protrudes towards the light-exiting part. The reflective part 30 is disposed on the side of the lens body 10 and 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 towards the light-inlet portion, and the central portion 212 protrudes towards the light-outlet portion. When the emitted light from the light source 101 passes through the central portion 212 protruding towards the light-outlet portion, it is redistributed, causing the light beam illuminating the bottom wall 21 of the central portion 212 to diverge, generating an asymmetrical emitted light beam. This asymmetrical emitted light beam passes through the middle region of the light-outlet plate, thereby reducing the illuminance value in the middle region of the light-outlet plate, which in turn helps to improve the uniformity of illuminance on the light-outlet plate, so as to provide users with a better visual experience in the light path direction. Therefore, the technical solution of this embodiment effectively solves the problem in the related art where the light path is concentrated through the middle region of the light-outlet plate by the lens, resulting in uneven illuminance on the light-outlet plate. The aforementioned reflective portion 30 can reflect light incident from the cylindrical sidewall 22 to the light-emitting portion, so that all light incident from the cylindrical sidewall 22 can exit from the light-emitting portion, avoiding light loss caused by the light directly exiting from the surface where the reflective portion 30 is located.
[0069] It should be noted that the outer ring portion 211 is directly connected to the central portion 212, and the outer ring portion 211 is formed by sequentially splicing multiple curved surfaces along the circumference of the cylindrical sidewall 22. Both the second surface 12 and the first surface 11 can be planar or curved. The second surface 12 being parallel to the first surface 11 means that the 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 protruding toward the light-inlet portion. These annular portions are sequentially connected from the cylindrical sidewall 22 to the center portion 212. The center portion 212 includes a plurality of protrusions protruding toward the light-outlet portion. These protrusions are sequentially connected circumferentially along the outer ring portion 211. When the emitted light passes through the plurality of annular portions and protrusions protruding toward the light-outlet portion, it undergoes multiple redistributions, effectively diverging the light beam illuminating the bottom wall 21 of the center portion 212. This generates an asymmetrical and irregular emitted light beam. This asymmetrical and irregular emitted light beam passes through the central region of the light-outlet plate, thereby effectively reducing the illuminance value in the central region of the light-outlet plate. It should be noted that the aforementioned annular portions can be circular, elliptical, wavy, or polygonal.
[0071] To further illustrate the effect of the redistribution of the emitted light from the light source 101 as it passes through the central portion 212, this application provides a comparative illustration of the effect of the light source shining through the lens 1 onto the Ruili heat sink in the related art.
[0072] Specifically, refer to Figures 1 to 3The lens 1 in the related art includes a mounting recess recessed into the lens body to accommodate a light source. The mounting recess has an arcuate concave surface protruding towards the light source. When the light source passes through the center of the arcuate concave surface, the light beam near the center of the arcuate concave surface is concentrated (see...). Figure 2 In this application, reference is made to... Figure 8 and Figure 9 When the light emitted from the light source 101 passes through the central portion 212, the light beam in the central portion 212 diverges (see...). Figure 9 Thus, the central portion 212, which protrudes towards 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 and promoting uniformity on the light-emitting plate.
[0073] It should be noted that, Figure 1 and Figure 2 The beam-gathering effect in the middle beam is based on actual simulation results. Figure 8 and Figure 9 The beam divergence effect is based on actual simulation results.
[0074] like Figures 5 to 7 as well as Figure 10 As shown, 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 defined as the centerline L0. The cylindrical sidewall 22 includes a first sidewall 221 and a second sidewall 222 symmetrically arranged with respect to the central symmetry plane A0. The first sidewall 221 and the second sidewall 222 form a first intersecting line L14 and a second intersecting line L25 within the central symmetry plane A0. The outer ring portion 211 forms a first curve L01 and a second curve L02 located on both sides of the central portion 212 within 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 within the central symmetry plane A0.
[0075] To specifically analyze the working principle of beam divergence in the central part 212 when the emitted light from the light source 101 passes through it, we will take the third curve L03 and the first curve L01 as examples. Figure 5 and Figure 10 As shown, the specific analysis is as follows:
[0076] The incident ray at the central point A1 is A1A2, and the outgoing ray is A2e.
[0077] The tangent line at point L01 of the first curve is aA2b, and the normal line at the midpoint A2 is cA2d.
[0078] Therefore, the incident angle of the incident ray A1A2 at the midpoint A2 is ∠A1A2d, and the exit angle of the outgoing ray A2e is ∠cA2e.
[0079] Assuming the refractive index of lens 1 is Rf, then according to Snell's law, Rf × sin∠cA2e = sin∠A1A2d.
[0080] The refractive index Rf of the lens material (such as plastic or glass) is always greater than 1. Therefore, a simple calculation shows that ∠cA2e < ∠A1A2d, meaning the exit angle is smaller than the incident angle. Correspondingly, the exit ray A2e deviates from the A2z-axis where the incident ray A1A2 lies. That is, the light beam near the midpoint A2, close to the first curve L01, diverges.
[0081] By reasoning similarly as above, we can conclude that the outgoing light rays from the midpoint A2 near the second curve L02 will deviate from the A2z axis where the incident light ray is located, and the outgoing light rays passing through the first curve L01 and the outgoing light rays passing through the second curve L02 are distributed on both sides of the A2z axis, that is, the beam at the center 212 is diverging.
[0082] like Figures 5 to 7 as well as Figure 10 As shown, in this embodiment, the first curve L01 intersects the first intersection line L14 at the first intersection point B1, and the line connecting the center light point A1 and the first intersection point B1 is the first straight line L1. A first angle is formed between the center 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 line connecting the center light point A1 and the second intersection point B2 is the second straight line L2. A second angle is formed between the center line L0 and the second straight line L2, and the first angle is greater than the second angle. This results in the length of the light-emitting plate (length of line segment pq) covered by the emitted light rays corresponding to the first curve L01 and the third curve L03 being greater than the length of the light-emitting plate (length of line segment mp) covered by the emitted light rays corresponding to the second curve L02 and the fourth curve L04. This allows for more light energy in the distal direction of the light-emitting plate, which is beneficial for increasing illuminance and making the illuminance of the light-emitting plate more uniform along its length. The distal end of the light-emitting plate refers to the end of the light-emitting plate furthest from the light source 101.
[0083] The inventors discovered that, since the size of lens 1 is much smaller than the distance between lens 1 and the light-emitting plate in practical applications, the lens can be approximated as a light source 101 during the analysis. The specific analysis of the technical effect of the first included angle being greater than the second included angle is as follows:
[0084] like Figure 11 As shown, point A1 is the center spot of light source 101, and 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 light source 101, and the ray between optical axes A1np and A1sq corresponds to... Figure 7The first curve L01 and the third curve L03 in the figure correspond to the light rays between the optical axis A1np and A1m. Figure 7 The second curve L02 and the fourth curve L04 are shown in the diagram. Assume that ∠qA1p=∠pA1m=α, that is, we first assume that the first included angle is equal to the second included angle.
[0085] Assume ∠A1qp=θ, in △spq pq=sp / sin(θ), in △A1sp p=A1p×sin(α), so pq=A1p×sin(α) / sin(θ).
[0086] In △mnp, mp = mn / sin(∠npm), and for △A1pq, ∠npm = ∠pA1q + ∠pqA1 = α + θ.
[0087] Therefore, mp = mn / sin(α+θ).
[0088] In △mA1n, mn = A1m × sin(α).
[0089] Therefore, mp=A1m×sin(α) / sin(α+θ).
[0090] Therefore, pq / mp=(A1p / A1m)×(sin(α+θ) / sin(θ)).
[0091] Simple reasoning leads to the conclusion that A1p > A1m, therefore A1p / A1m > 1.
[0092] It is also obvious that sin(α+θ) / sin(θ)>1.
[0093] Therefore, pq / mp > 1, which means pq > mp.
[0094] In other words, when ∠qA1p = ∠mA1p = α, the length of the light-emitting plate covered by the emitted ray corresponding to ∠qA1p (the length of line segment pq) is greater than the length of the light-emitting plate covered by the emitted ray corresponding to ∠mA1p (the length of line segment mp). That is, after... Figure 7 The length of the light-emitting plate covered by the rays emitted from lens 1, as shown by the first curve L01 and the third curve L03, is greater than that of the light-emitting plate. Figure 7 The length of the light-emitting plate covered by the light rays emitted from the second curve L02 and the fourth curve L04 of lens 1 is shown.
[0095] like Figure 10 As shown, if we assume the first included angle is equal to the second included angle, the light energy from the light-emitting plate length pq is equal to that from the light-emitting plate length mp. Furthermore, pq > mp, resulting in the illuminance at the light-emitting plate length pq being less than the illuminance at the light-emitting plate length mp. However, in this embodiment, as... Figure 7As shown, because the first included angle is greater than the second included angle, the emitted light rays are... Figure 10 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 7 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 7 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 Figures 5 to 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 11 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 12 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 11 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 13 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 13 and Figure 14 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 14 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 14 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 Figure 14 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 14As 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 14 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 9 ∠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 15 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 15 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 15 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 15 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 15 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 15 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 5 , Figure 7 as well as Figure 13 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 Figures 13 to 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 Figures 13 to 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 Figures 16 to 21As 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 Figures 16 to 21 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 Figures 16 to 21 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 18 (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 16 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 16 The front wall moves to the side, and the corresponding outgoing light falls on the wall. Figure 16 The proportion of the ground side will decrease. Therefore, θ has an optimal upper limit value. max Preferably, θ max ≤80°.
[0138] For example Figure 17 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 Figure 8 , Figure 9 and Figure 13 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 Figure 8 , Figures 20 to 22 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 20 and Figure 21 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 20 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 23 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 23 and Figure 24 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 Figures 24 to 26 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 26 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. Figure 25 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 26 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 22 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 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) and a lens (1), characterized in that, The lighting device further includes a housing (40) and a light-emitting plate (60). The light source (101) and the 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 disposed at the light-emitting port. The light-emitting plate (60) is a Rayleigh scattering plate. The light-emitting plate (60) is located on the path of the light emitted by the light source (101). 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. The light source (101) generates asymmetrical emitted light rays through the lens (1). The lens has a symmetrical structure. The vertical axis C1 is defined as the straight line passing through the center light point A1 of the light source (101) and perpendicular to the ground. When the center light point A1 of the light source (101) passes through the housing (40), it forms the main ray C2 of the emitted beam. The vertical axis C1 and the main ray C2 of the emitted beam form a seventh angle, which is between 45° and 80°.
2. The lighting device according to claim 1, characterized in that, It has a central symmetry plane A0, and the lens is used to perform off-center astigmatism on the light source.
3. 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).
4. 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).
5. The lighting device according to claim 1, characterized in that, 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.
6. The lighting device according to claim 5, 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).
7. 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.
8. The lighting device according to claim 7, characterized in that, The first side plate and the third side plate are parallelograms, and the second side plate and the fourth side plate are rectangles; and / or, the lighting device further includes an anti-reflection structure (50), which is disposed on the fourth side plate.
9. 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.