Lens, light-exit structure and illumination device
By combining the first sub-lens of the Fermat spiral based on the Fibonacci sequence with a Fresnel lens, the problem of uneven illuminance in the lamp lens module is solved, achieving high central light intensity and uniform light spot, thus improving light energy utilization and illumination uniformity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUIZHOU NVC OPTOELECTRONICS TECH CO LTD
- Filing Date
- 2025-06-25
- Publication Date
- 2026-07-14
AI Technical Summary
Existing lighting lens modules suffer from problems such as uneven lens illumination, central dark areas, layered light spots, and yellow edges. Current technologies have failed to effectively address these issues by improving lens structure to enhance lighting uniformity and luminous efficiency.
By combining a Fibonacci sequence Fermat spiral first sub-lens with a Fresnel lens, along with a total reflection surface and a regular hexagonal second sub-lens, secondary light mixing is performed to control light convergence and overlap, thereby improving light energy utilization.
It achieves high central light intensity and uniform light spot, improves light energy utilization, lighting effect, and lighting uniformity, thus meeting lighting needs.
Smart Images
Figure CN224498295U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of lighting devices, specifically relating to a lens, a light-emitting structure, and a lighting device. Background Technology
[0002] Lenses are typically used in lighting fixtures to control the light emitted by the light source in order to form a uniform light spot.
[0003] Existing technology discloses a lamp lens module, including a lamp cup-shaped lens body. The light-inlet end of the lens body has a circular cavity, and the light-outlet end has a hemispherical cavity. A first convex lens is integrally formed on the bottom wall of the circular cavity, and multiple Fresnel lenses are integrally formed on the top wall of the hemispherical cavity. This lamp lens module, through the combination of the convex lens at the light inlet and the multiple Fresnel lenses, completely concentrates light within the angular range, improving the lens's luminous efficacy and central light intensity, thus enhancing illumination brightness and effect. However, the lens module's illuminance is not uniform enough, exhibiting problems such as a central dark area, layered light spots, and yellow edges. Therefore, improvements to the existing lens structure are needed. Utility Model Content
[0004] To address the shortcomings of existing technologies, this invention provides a lens that, through the cooperation of a Fibonacci sequence Fermat spiral first sub-lens in the light-incident section and a Fresnel lens in the light-out section, achieves high central light intensity and a uniform light spot. Furthermore, by performing secondary light mixing, it improves light energy utilization and achieves uniform illumination. This invention also provides a light-out structure and an illumination device incorporating this lens.
[0005] In a first aspect, this utility model provides a lens for processing light emitted from a light source, the lens comprising a lens body having an optical axis, the lens body comprising:
[0006] The light-incident section includes a first light-incident surface and a second light-incident surface disposed outside the first light-incident surface. The first light-incident surface is provided with a first sub-lens distributed in a Fibonacci sequence Fermat spiral pattern.
[0007] The side, including the total reflection surface;
[0008] The light-emitting section includes a first light-emitting surface and a second light-emitting surface disposed outside the first light-emitting surface, wherein the second light-emitting surface is provided with second sub-lenses arranged in an array.
[0009] The light emitted by the light source enters the lens body through the first light-incident surface and exits from the first light-exiting surface; the other part enters the lens body through the second light-incident surface and is reflected by the total reflection surface before exiting from the second light-exiting surface.
[0010] In some embodiments, the first light-emitting surface includes a convex lens and a first ring, a second ring, and a third ring disposed outside the convex lens. The first ring is connected to the convex lens, and the third ring is connected to the second light-emitting surface.
[0011] In some embodiments, the lens body is a rotationally symmetric body with the optical axis as the axis of rotation, and the first light-incident surface is provided with a central sub-lens passing through the optical axis. The first sub-lens are arranged around the central sub-lens in a Fermat spiral pattern according to the Fibonacci sequence.
[0012] In some embodiments, the plane containing the end of the lens body closest to the light source is used as the reference plane, and the point where the central sub-lens intersects the optical axis is used as the origin O; a coordinate axis (x, y) is established on a first plane passing through the origin O and parallel to the reference plane, and the projection of the first incident surface onto the first plane has the following relationship:
[0013]
[0014] x = r * cosΦ, y = r * sinΦ;
[0015] Where n is the nth first sub-lens,
[0016] c is the distance between two adjacent first sub-lenses.
[0017] r is the distance between the center of the nth first sub-lens and the origin O;
[0018] Φ is the angle between the line connecting the center of the nth first sub-lens and the origin O in the positive x-axis direction and the x-axis;
[0019] x and y represent the position coordinates of the nth first sub-lens.
[0020] In some embodiments, the plane containing the end of the lens body furthest from the light source is designated as the second plane. The convex lens, the first ring, the second ring, and the third ring all convex towards the second plane, and the first light-emitting surface has the following relationship:
[0021] H0 < H1 < H2 < H3;
[0022] Wherein, H0, H1, H2, and H3 are the distances from the top of the convex lens, the top of the first ring, the top of the second ring, and the top of the third ring to the first plane, respectively.
[0023] In some embodiments, the plane at the end of the lens body near the light source is used as the reference plane, the first light-incident surface is a curved surface convex to the reference plane, and the second light-incident surface is a curved surface convex to the optical axis;
[0024] In the cross-section of the lens body passing through the optical axis, the second incident surface is a parabola convex to the optical axis, expressed as: y = kx 2 (0 < x1 < x2),
[0025] Where k is a constant, greater than 0.
[0026] In some embodiments, the incident light emitted by the light source enters the second incident surface and intersects at the incident point M, as shown in the following equation:
[0027] α = tan -1 (2kx),
[0028] β=90°-(α+θ)=90°-[tan -1 [(2kx)+θ],
[0029]
[0030] Where θ is the angle between the incident ray and the reference plane.
[0031] α is the angle between the tangent at the incident point M and the reference plane.
[0032] β is the angle between the tangent at the incident point M and the tangent to the parabola containing the second incident surface.
[0033] δ is the angle between the refracted ray and the incident ray.
[0034] n' is the refractive index of the lens material.
[0035] In some embodiments, the total reflection surface is a curved surface that is concave in a direction away from the optical axis, and the total reflection surface is provided with a sub-reflector with a micro-prismatic scale structure;
[0036] The second sub-lens has a regular hexagonal structure.
[0037] Secondly, this utility model provides a light-emitting structure, including a light source and the aforementioned lens. The light-incident part is provided with a light-incident cavity formed by the first light-incident surface and the second light-incident surface, and the light source is disposed below or inside the light-incident cavity.
[0038] Thirdly, this utility model provides a lighting device, including the light-emitting structure described above, wherein all the light emitted by the light source enters the light-incident cavity and is received by the first light-incident surface and the second light-incident surface.
[0039] In summary, this utility model has at least the following advantages:
[0040] 1. The lens provided by this utility model, on the one hand, obtains a high central light intensity and a uniform light spot by cooperating with a first sub-lens with a Fibonacci sequence Fermat spiral distribution in the light-incident part and a Fresnel lens in the light-out part; on the other hand, by using a second light-incident part with a parabolic structure that is convex to the optical axis in the light-incident part, the optical rays are controlled to converge toward the center, thereby obtaining a narrower light distribution curve. Combined with a sub-reflector with a micro-prismatic scale structure on the side and a second sub-lens with a regular hexagonal shape in the light-out part, secondary light mixing is performed to improve light energy utilization and achieve uniform illumination.
[0041] 2. The light-emitting structure and lighting device provided by this utility model allow the light emitted by the light source to overlap and complement each other in the lighting area after passing through the lens body, thereby obtaining higher central light intensity, light energy utilization rate, and improved lighting uniformity to meet lighting needs. Attached Figure Description
[0042] Figure 1 This is a schematic diagram of the lens structure in Embodiment 1 of this utility model.
[0043] Figure 2 for Figure 1 A sectional view along section line AA.
[0044] Figure 3 This is a bottom view of the lens in Embodiment 1 of this utility model.
[0045] Figure 4 for Figure 3 Enlarged schematic diagram of part B.
[0046] Figure 5 This is a top view of the lens in Embodiment 1 of this utility model.
[0047] Figure 6 for Figure 5 An enlarged schematic diagram of section C.
[0048] Figure 7 This is a schematic diagram of the optical path of a portion of the light rays in Embodiment 1 of this utility model.
[0049] Figure 8 This is a schematic diagram of the optical path of another portion of the light rays in Embodiment 1 of this utility model.
[0050] Figure 9 This is a schematic diagram of the projection of the first light-incident surface onto the first plane in Embodiment 1 of this utility model.
[0051] Figure 10 This is a schematic diagram of the first incident light surface splitting the light beam in Embodiment 1 of this utility model.
[0052] Figure 11 This is a simplified schematic diagram of the on-axis spherical aberration of the first light-emitting surface in Embodiment 1 of this utility model.
[0053] Figure 12 This is a schematic diagram of the parabolic structure of the second light-incident surface in Embodiment 1 of this utility model.
[0054] Figure 13 This is a schematic diagram of the light rays reflected by the total internal reflection surface after entering the second light-incident surface in Embodiment 1 of this utility model.
[0055] Figure 14 This is a schematic diagram comparing the light paths of a parabola and a straight line for the second light-incident surface in Embodiment 2 of this utility model.
[0056] Figure 15 This is a comparison diagram of the light distribution curves of the second light incident surface in Embodiment 2 of this utility model, which are parabolic and linear.
[0057] Figure 16 This is a comparison diagram of light spots with parabolic and straight lines on the second incident surface of Embodiment 2 of this utility model.
[0058] Figure 17 This is an exploded view of the light-emitting structure of Embodiment 3 of this utility model.
[0059] Marked in the image:
[0060] 100-lens;
[0061] 10-Lens body, 1-Incident part, 2-Side part, 3-Outcrying part;
[0062] 11-First light-incident surface, 12-Second light-incident surface, 13-Light-incident cavity;
[0063] 101 - Entrance lens, 10 - Exit lens, 110 - Central sub-lens, 111 - First sub-lens
[0064] 21-Total reflection surface, 211-Sub-reflector;
[0065] 31-First light-emitting surface, 32-Second light-emitting surface, 321-Second sub-lens;
[0066] 310 - Convex lens, 311 - First ring body, 312 - Second ring body, 313 - Third ring body;
[0067] P0 - Reference plane, P1 - First plane, P2 - Second plane, L - Optical axis;
[0068] 200 - Light source component, 300 - Light emission structure. Detailed Implementation
[0069] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings and specific embodiments. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.
[0070] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.
[0071] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
[0073] Example 1
[0074] Please see Figures 1-13 This embodiment provides a lens 100 for processing light emitted from a light source 200. The lens 100 includes a lens body 10 with an optical axis L. The lens body 10 includes an incident light portion 1, a side portion 2, and an exiting light portion 3. The incident light portion 1 includes a first incident light surface 11 and a second incident light surface 12, with the second incident light surface 12 located outside the first incident light surface 11. A first sub-lens 111, arranged in a Fermat spiral pattern according to the Fibonacci sequence, is disposed on the first incident light surface 11.
[0075] The side portion 2 is connected to the light-incident portion 1 and the light-exit portion 3, and the side portion 2 includes a total reflection surface 21.
[0076] The light-emitting part 3 includes a first light-emitting surface 31 and a second light-emitting surface 32. The second light-emitting surface 32 is disposed outside the first light-emitting surface 31, and second sub-lenses 321 are arranged in an array on the second light-emitting surface 32.
[0077] refer to Figure 7 and Figure 8 The light emitted from the light source 200, a portion of which enters the lens body 10 through the first light-incident surface 11 and exits from the first light-exit surface 31.
[0078] Another portion of the light enters the lens body 10 through the second light-incident surface 32, and after being reflected by the total reflection surface 21, it finally exits from the second light-out surface 32.
[0079] Specifically, the lens body 10 has a bowl-shaped or hemispherical structure. The end of the lens body 10 closest to the light source 200 is the light-incident end 101, and the end furthest from the light source 200 is the light-exit end 102. The light-incident portion 1 is recessed from the light-incident end 101 toward the light-exit end 102, forming a light-incident cavity 13. The light-incident cavity 13 is formed by a first light-incident surface 11 and a second light-incident surface 12, that is, the first light-incident surface 11 and the second light-incident surface 12 define the top surface and the side surface of the light-incident cavity 13. The first sub-lens 111 disposed on the first light-incident surface 11 follows the Fermat spiral distribution of the Fibonacci sequence.
[0080] The first light-emitting surface 31 has a Fresnel lens structure, including a convex lens 310, and a first ring body 311, a second ring body 312, and a third ring body 313 disposed outside the convex lens 310. The convex lens 310 is located in the middle of the first light-emitting surface 31, the first ring body 311 is connected to the convex lens 310, and the third ring body 313 is located on the outermost side of the first light-emitting surface 31 and is connected to the second light-emitting surface 32.
[0081] The light emitted by the light source 200 enters the lens body 10 through the first light-incident surface 11 and exits from the first light-exit surface 31. In this light-exit path, the light first enters the lens body 10 through the first light-incident surface 11, which is provided with a first sub-lens having a compound eye structure and a Fibonacci sequence Fermat spiral distribution, and then exits from the first light-exit surface 31, which has a Fresnel lens structure, to the illumination area, thereby obtaining a higher central light intensity and a more uniform illumination spot.
[0082] The lens body 10 is a rotationally symmetric body with the optical axis L as the rotation axis; at the same time, the optical axis L is also the center line of the lens body 10. In the first incident light surface 11, the first sub-lens passing through the optical axis L is the central sub-lens 110, and the remaining first sub-lenses 111 are arranged around the central sub-lens 110 in the Fermat spiral of the Fibonacci sequence.
[0083] Reference Figure 2 and Figure 9 Taking the plane of the end of the lens body 10 closest to the light source, i.e., the incident light end 101, as the reference plane P0, and the point where the central sub-lens 101 intersects the optical axis L as the origin O, a coordinate axis (x, y) is established on the first plane P1 passing through the origin O and parallel to the reference plane P0. The projection of the first incident light surface 11 onto the first plane P1 has the following relationship:
[0084]
[0085] x = r * cosΦ, y = r * sinφ;
[0086] Where n is the nth first sub-lens,
[0087] c is the distance between two adjacent first sub-lenses.
[0088] r is the distance between the center of the nth first sub-lens and the origin O;
[0089] φ is the angle between the line connecting the center of the nth first sub-lens and the origin O in the positive x-axis direction and the x-axis;
[0090] x and y represent the position coordinates of the nth first sub-lens, that is, the coordinates of the nth first sub-lens are N(x, y).
[0091] Based on the above relationship, the first sub-lens has a compound eye microlens structure, arranged according to the Fibonacci sequence and Fermat spiral, so that the light entering the first incident surface is dispersed but controlled within a certain range, thereby achieving precise light control.
[0092] Reference Figure 9 and Figure 10 After the light emitted by the light source passes through the first incident surface 11, the entire illumination beam is split into N channels (N being the total number of first sub-lenses). Each first sub-lens 111 independently images the light source, thus forming N images of the light source, which are called secondary light sources. Since the entire incident wide beam is divided into N narrow beams, the uniformity within each narrow beam is obviously greater than the uniformity within the entire wide beam.
[0093] However, due to the presence of spherical aberration, the improvement of light output uniformity by the first sub-lens 111 with a compound eye structure is limited. In this embodiment, the spherical aberration of the first light-emitting surface 31 with a Fresnel lens structure is reduced to further improve the illumination uniformity.
[0094] Further reference Figure 2In the first light-emitting surface 31, the plane at the end of the lens body 10 away from the light source, i.e. the light-emitting end 102, is the second plane P2. The convex lens 310, the first ring body 311, the second ring body 312 and the third ring body 313 all convex toward the light-emitting end surface 102.
[0095] The first light-emitting surface 31 has the following relationship: H0 < H1 < H2 < H3;
[0096] Wherein, H0, H1, H2, and H3 are the distances between the top of the convex lens 310, the top of the first ring 311, the top of the second ring 312, and the top of the third ring 313 and the first plane P1, respectively.
[0097] As described above, the lens body 10 has a rotationally symmetric structure, with the rotation axis being the optical axis L of the lens. Since off-axis spherical aberration and on-axis spherical aberration have essentially the same properties, on-axis spherical aberration will be used for explanation to simplify the steps.
[0098] Reference Figure 2 and Figure 11 In the first light-emitting surface 31, the convex lens 310 at the center and the outermost third ring 313 play a decisive role in the spherical aberration of the Fresnel lens. Therefore, in this embodiment, by reducing the center height of the convex lens 310 and increasing the outer ring height of the outermost third ring 313, the spherical aberration of the Fresnel lens is reduced.
[0099] Specifically, this embodiment increases the number of concentric rings of the Fresnel lens, increases the height of the central convex lens, and increases the height of the outermost third ring. Considering light energy loss, the complexity of the manufacturing process, and the layering of the light spot, this embodiment adopts a four-layer structure, namely a Fresnel design with a gradually changing height from the middle convex lens to the outermost third ring; that is, H0 < H1 < H2 < H3; H0, H1, H2, and H3 are the distances from the top of the convex lens 310, the top of the first ring 311, the top of the second ring 312, and the top of the third ring 313 to the first plane P1, respectively.
[0100] The secondary light sources are focused after passing through the first light-emitting surface with a Fresnel lens structure. They are then reversed and overlapped on the illumination area, compensating for each other, thus achieving a more uniform illuminance distribution.
[0101] In the first light-emitting path, a portion of the light emitted from the light source 2 enters the lens body 10 through the first light-incident surface 11 and exits from the first light-emitting surface 31.
[0102] The first sub-lens, arranged in the Fibonacci sequence and Fermat spiral pattern in the first light-entry surface, and having a compound eye structure, work together with the Fresnel lens structure in the first light-exit surface to make the illumination spot more uniform, while maintaining a large light energy utilization rate and central light intensity.
[0103] Furthermore, the first light-incident surface 11 is a curved surface convex to the reference plane P0, and the second light-incident surface 12 is a curved surface convex to the optical axis L.
[0104] The second light exit path is described below. In the second light exit path, the light enters the lens body 10 through the second light entrance surface 32, is reflected by the total reflection surface 21, and finally exits from the second light exit surface 32.
[0105] Specifically, in the cross-section of the lens body 10 passing through the optical axis L, the second incident surface 12 is a parabola convex to the optical axis L, and its expression is: y = kx 2 (0 < x1 < x2), where k is a constant greater than 0.
[0106] Reference Figure 2 and Figure 12 Taking the plane where the light-incident end 101 is located as the reference plane P0, the incident light ray D1 emitted by the light source enters the second light-incident surface 12 and intersects at the incident point M, with the following relationship:
[0107] α = tan -1 (2kx),
[0108] β=90°-(α+θ)=90°-[tan -1 [(2kx)+θ],
[0109]
[0110] Where θ is the angle between the incident ray D1 and the reference plane.
[0111] α is the angle between the tangent F1 at the incident point M and the reference plane.
[0112] β is the angle between the tangent F1 at the incident point M and the tangent F2 of the parabola containing the second incident surface.
[0113] δ is the angle between the refracted ray D2 and the incident ray D1, that is, the angle of change in the incident ray D1 due to refraction;
[0114] n' is the refractive index of the lens material.
[0115] δ decreases as x and θ increase.
[0116] When tan -1 When (2kx)+θ=90°, δ=0; the refracted ray D2 is in the same direction as the incident ray D1;
[0117] When tan -1 When (2kx)+θ<90°, δ>0; the refracted ray D2 is deflected upwards compared to the incident ray D1, and the smaller x and θ are, the larger the upward deflection angle is;
[0118] When tan -1 When (2kx)+θ>90°, δ<0; the refracted ray D2 is deflected downwards compared to the incident ray D1, and the larger x and θ are, the larger the downward deflection angle is.
[0119] That is, after the incident ray D1 is refracted by the second incident surface 12 which has a parabolic structure, the outgoing ray will be more focused, and the focusing effect of the edge rays will be more obvious.
[0120] Figure 13 This diagram illustrates the light rays that, after partially entering the second incident surface, are reflected by the total internal reflection surface. In 13A, both x and θ change; in 13B, x changes while θ remains constant; and in 13C, x remains constant while θ changes. (Refer to reference...) Figure 12 and Figure 13 ,
[0121] Where I is the center of the light source of light source 200, and the red ray is tan λ. -1 The incident ray at (2kx)+θ=90°, the blue ray is tan ... -1 The incident light ray with (2kx)+θ≠90°, and the green ray, are the refracted rays after being refracted by the second incident surface 12, which has a parabolic structure. The beam width of the refracted ray is smaller than that of the original incident ray, resulting in a smaller beam width of the reflected ray after total internal reflection 21 and an increased probability of the ray intersecting the central ray. Therefore, using a second incident surface with a parabolic structure, combined with a total internal reflection surface, can achieve precise control of the second light exit path, reduce stray light at the edges, and make the light spot color more uniform, while increasing the illumination area and intensity of the central light spot.
[0122] Back Figure 1 In side portion 2, the total reflection surface 21 is a concave curved surface that moves away from the optical axis L. The total reflection surface 21 is provided with sub-reflectors 211 with a micro-prismatic scale structure. In this embodiment, the total reflection surface is composed of sub-reflectors 211 with a micro-prismatic scale structure, which has a micro-spherical structure. After the light is refracted by the second incident surface, it is further reflected by the sub-reflectors 211, resulting in cross-mixing to obtain a more uniform illumination distribution.
[0123] Furthermore, the second sub-lens 221 of the second light-emitting surface 22 has a regular hexagonal structure. The light reflected by the total reflection surface 21 is mixed twice by the second sub-lens 221, which has a regular hexagonal shape and a compound eye structure, so that the illuminance distribution in the irradiated area is more uniform.
[0124] The lens provided in this embodiment achieves high central light intensity and a uniform light spot through a combination of a first sub-lens with a Fibonacci sequence Fermat spiral distribution in the light-incident section and a Fresnel lens in the light-out section. Furthermore, a second light-incident section with a parabolic structure convex to the optical axis controls the optical rays to converge towards the center, resulting in a narrower light distribution curve. This, combined with a sub-reflector with a micro-prismatic scale structure on its side and a second hexagonal sub-lens in the light-out section, performs secondary light mixing, improving light energy utilization and achieving uniform illumination. In addition, the lens reduces its size and saves materials, achieving a lightweight and thin profile while concentrating light to form a uniform light spot.
[0125] Example 2
[0126] This embodiment compares the light output effect when the second incident surface is a parabola and a straight line. For example... Figure 14 As shown, 14A is a comparison of the light paths of light rays emitted from the center I of the light source, passing through the second light-incident surface 22 of the parabola and the third light-incident surface 25 of the straight line; 14B is a comparison of the light paths of light rays emitted from the left side of the center I of the light source, passing through the second light-incident surface 22 of the parabola and the third light-incident surface 25 of the straight line; 14C is a comparison of the light paths of light rays emitted from the right side of the center I of the light source, passing through the second light-incident surface 22 of the parabola and the third light-incident surface 25 of the straight line.
[0127] The blue ray is the incident ray, the green ray is the refracted ray after passing through the second incident surface 22 of the parabola, and the pink ray is the refracted ray after passing through the third incident surface 25 of the straight line.
[0128] Compared to the refracted ray after passing through the third incident surface 25 (which is a straight line), the refracted ray after passing through the second incident surface 22 (which is a parabola) is more concentrated. The reflected ray after being reflected by the total reflection surface has a smaller beam width and a higher probability of ray intersection.
[0129] Figure 15 This embodiment presents a comparison of light distribution curves for a parabolic and a linear second light-incident surface. 15A corresponds to the light distribution curve for a parabolic second light-incident surface, and 15B corresponds to the light distribution curve for a linear second light-incident surface. For example... Figure 15 As shown, when the second incident surface has a parabolic structure, its central light intensity and K value are significantly improved.
[0130] Figure 16 This is a comparison diagram of light spots with a parabolic second light-incident surface and a straight line in this embodiment. 16A corresponds to a light spot with a parabolic second light-incident surface, and 16B corresponds to a light spot with a straight second light-incident surface. Figure 16 As shown, when the second incident surface has a parabolic structure, there is less stray light at the edge of the light spot, and the light spot is more concentrated.
[0131] Example 3
[0132] exist Figures 1-12 Based on reference Figure 17 This embodiment provides a light-emitting structure 300, including a light source 200 and a lens 100 as described in Embodiment 1. In the lens 100, the light-incident portion 1 is provided with a light-incident cavity 13, which is formed by a first light-incident surface 11 and a second light-incident surface 12. The light source 200 is disposed below or inside the light-incident cavity. In the light-emitting structure provided by this embodiment, the light emitted by the light source overlaps and complements each other in the illumination area after passing through the lens body, resulting in higher central light intensity, higher light energy utilization, and improved illumination uniformity.
[0133] Example 4
[0134] This embodiment provides a lighting device, including the light-emitting structure 300 of embodiment 3, in which all the light emitted by the light source 200 enters the light-inlet cavity 13 and is received by the first light-inlet surface 11 and the second light-inlet surface 12.
[0135] The lighting device provided in this embodiment allows the light emitted by the light source to overlap and complement each other in the lighting area after passing through the lens body, thereby obtaining higher central light intensity and light energy utilization, improving lighting uniformity, and meeting lighting needs.
[0136] The above description is merely an example and illustration of the structure of this utility model, and while the description is quite specific and detailed, it should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these obvious substitutions all fall within the protection scope of this utility model.
Claims
1. A lens for processing light emitted from a light source, characterized in that, The lens includes a lens body having an optical axis, and the lens body includes: The light-incident section includes a first light-incident surface and a second light-incident surface disposed outside the first light-incident surface. The first light-incident surface is provided with a first sub-lens distributed in a Fibonacci sequence Fermat spiral pattern. The side, including the total reflection surface; The light-emitting section includes a first light-emitting surface and a second light-emitting surface disposed outside the first light-emitting surface, wherein the second light-emitting surface is provided with second sub-lenses arranged in an array. The light emitted by the light source enters the lens body through the first light-incident surface and exits from the first light-exiting surface; the other part enters the lens body through the second light-incident surface and is reflected by the total reflection surface before exiting from the second light-exiting surface.
2. The lens according to claim 1, characterized in that, The first light-emitting surface includes a convex lens and a first ring, a second ring, and a third ring disposed outside the convex lens. The first ring is connected to the convex lens, and the third ring is connected to the second light-emitting surface.
3. The lens according to claim 2, characterized in that, The lens body is a rotationally symmetric body with the optical axis as the axis of rotation. The first light-incident surface is provided with a central sub-lens passing through the optical axis. The first sub-lens is arranged around the central sub-lens in a Fermat spiral pattern according to the Fibonacci sequence.
4. The lens according to claim 3, characterized in that, Using the plane containing the end of the lens body closest to the light source as the reference plane, and the point where the central sub-lens intersects the optical axis as the origin O; on a first plane passing through the origin O and parallel to the reference plane, establish coordinate axes (x, y), and the projection of the first incident surface onto the first plane has the following relationship: x = r * cosΦ, y = r * sinΦ; Where n is the nth first sub-lens, c is the distance between two adjacent first sub-lenses. r is the distance between the center of the nth first sub-lens and the origin O; Φ is the angle between the line connecting the center of the nth first sub-lens and the origin O in the positive x-axis direction and the x-axis; x and y represent the position coordinates of the nth first sub-lens.
5. The lens according to claim 4, characterized in that, Taking the plane containing the end of the lens body furthest from the light source as the second plane, the convex lens, the first ring, the second ring, and the third ring all convex towards the second plane. The first light-emitting surface has the following relationship: H0 < H1 < H2 < H3; Wherein, H0, H1, H2, and H3 are the distances from the top of the convex lens, the top of the first ring, the top of the second ring, and the top of the third ring to the first plane, respectively.
6. The lens according to claim 1, characterized in that, With the plane of the end of the lens body near the light source as the reference plane, the first light-incident surface is a curved surface convex to the reference plane, and the second light-incident surface is a curved surface convex to the optical axis; In the cross-section of the lens body passing through the optical axis, the second incident surface is a parabola convex to the optical axis, expressed as: y = kx 2 (0 < x1 < x2), Where k is a constant, greater than 0.
7. The lens according to claim 6, characterized in that, The incident light emitted by the light source enters the second incident surface and intersects at the incident point M, with the following relationship: α=tan -1 (2kx), β=90°-(α+θ)=90°-[tan -1 (2kx)+θ], Where θ is the angle between the incident ray and the reference plane. α is the angle between the tangent at the incident point M and the reference plane. β is the angle between the tangent at the incident point M and the tangent to the parabola containing the second incident surface. δ is the angle between the refracted ray and the incident ray. n' is the refractive index of the lens material.
8. The lens according to claim 1, characterized in that, The total reflection surface is a curved surface that is concave in a direction away from the optical axis, and the total reflection surface is provided with a sub-reflector with a micro-prismatic scale structure; The second sub-lens has a regular hexagonal structure.
9. A light-emitting structure, characterized in that, The light source includes a light source and a lens as described in any one of claims 1-8, wherein the light-incident portion is provided with a light-incident cavity formed by the first light-incident surface and the second light-incident surface, and the light source is disposed below or inside the light-incident cavity.
10. A lighting device, characterized in that, The light-emitting structure includes the light-emitting structure of claim 9, wherein all the light emitted by the light source enters the light-incident cavity and is received by the first light-incident surface and the second light-incident surface.