Lens, light emitting structure and lighting device

Abstract

The invention provides a lens which comprises a lens body with an optical axis, the lens body comprises a light-in part, a side part and a light-out part, the light-in part comprises a first light-in surface and a second light-in surface, and the first light-in surface is provided with first sub-lenses distributed in a Fibonacci sequence Fermat spiral mode; the side part comprises a fully reflecting surface; the light-emitting part comprises a first light-emitting surface and a second light-emitting surface, and the second light-emitting surface is provided with second sub-lenses distributed in an array; part of light emitted by the light source piece enters the lens body through the first light inlet face and is emitted out of the first light outlet face. And the other part enters the lens body through the second incident surface, is reflected by the fully reflecting surface and then is emitted from the second emergent surface. According to the lens, the first sub-lenses which are distributed in a Fibonacci sequence Fermat spiral mode are matched with the Fresnel lens, high center light intensity and uniform light spots are obtained, secondary light mixing is carried out on light rays, and the light energy utilization rate is improved. The invention further provides a light emitting structure comprising the lens and a lighting device.

Description

Technical Field

[0001] The present invention belongs to the technical field of lighting devices, and particularly relates to a lens, a light output structure and a lighting device. Background Art

[0002] In lamps, lenses are usually used to control the light emitted by the light source to form a uniform light spot.

[0003] The prior art discloses a lamp lens module, comprising a lamp cup-shaped lens body, a circular cavity formed at the light inlet end of the lens body, a hemispherical cavity formed at the light outlet end of the lens body, a raised first convex lens integrally formed on the bottom wall of the circular cavity, and a multi-layer Fresnel lens body integrally formed on the top wall of the hemispherical cavity. The lamp lens module, through the light inlet convex lens and the multi-layer Fresnel lens body, completely receives light within the angular range, thereby improving the lens's light efficiency and central light intensity, and facilitating improved lighting brightness and lighting effects. However, the lens illumination of this lens module is not uniform, and there are problems such as a dark area in the center, stratified light spots, and yellow edges. Therefore, there is a need to improve the existing lens structure. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention provides a lens that utilizes a Fibonacci sequence Fermat spiral-shaped first sub-lens at the light input portion, in conjunction with a Fresnel lens at the light output portion, to achieve high central light intensity and a uniform light spot. Furthermore, secondary light mixing is performed to improve light energy utilization and achieve uniform illumination. The present invention also provides a light output structure and lighting device incorporating the lens.

[0005] In a first aspect, the present invention provides a lens for processing light emitted by a light source, wherein the lens comprises a lens body having an optical axis, and the lens body comprises:

[0006] The light incident portion includes a first light incident surface and a second light incident surface provided outside the first light incident surface, wherein the first light incident surface is provided with first sub-lenses distributed in a Fibonacci sequence Fermat spiral pattern;

[0007] a side portion, including a fully reflective surface;

[0008] a light emitting portion comprising a first light emitting surface and a second light emitting surface provided outside the first light emitting surface, wherein the second light emitting surface is provided with second sub-lenses distributed in an array;

[0009] A portion of the light emitted by the light source enters the lens body through the first light incident surface and is emitted from the first light emitting surface; another portion enters the lens body through the second light incident surface and is reflected by the total reflection surface before being emitted from the second light emitting surface.

[0010] In some embodiments, the first light-emitting surface includes a convex lens and a first ring body, a second ring body, and a third ring body arranged outside the convex lens, the first ring body is connected to the convex lens, and the third ring body 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 rotation axis; the first light incident surface is provided with a central sub-lens passing through the optical axis, and the first sub-lenses are arranged around the central sub-lens according to the Fibonacci sequence Fermat spiral.

[0012] In some embodiments, a plane on which one end of the lens body close to the light source is located is used as a reference plane, and a point where the central sub-lens intersects the optical axis is used as an 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 light incident surface on the first plane satisfies the 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 and the X-axis in the positive direction of the x-axis;

[0019] x and y represent the position coordinates of the nth first sub-lens.

[0020] In some embodiments, the plane where the end of the lens body away from the light source is located is defined as the second plane, the convex lens, the first ring body, the second ring body, and the third ring body are all convex toward the second plane, and the first light-emitting surface has the relationship:

[0021] H0

[0022] Among them, H0, H1, H2, and H3 are respectively the distances between the top of the convex lens, the top of the first ring body, the top of the second ring body, and the top of the third ring body and the first plane.

[0023] In some embodiments, taking a plane where one end of the lens body close to the light source is located as a reference plane, the first light incident surface is a curved surface convex toward the reference plane, and the second light incident surface is a curved surface convex toward the optical axis; ​

[0024] In the cross section of the lens body passing through the optical axis, the second light incident surface is a parabola convex toward the optical axis, and its expression is: y = kx 2 (0<x1<x2),

[0025] Wherein, k is a constant greater than 0.

[0026] In some embodiments, the incident light emitted by the light source enters the second light incident surface and intersects at the incident point M, which has the relationship:

[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 light and the reference plane,

[0031] α is the angle between the tangent line of the incident point M and the reference plane,

[0032] β is the angle between the tangent line of the incident point M and the tangent line of the parabola where the second light incident surface is located,

[0033] δ is the angle between the refracted light and the incident light,

[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 having a micro-prismatic flake structure;

[0036] The second sub-lens has a regular hexagonal structure.

[0037] In a second aspect, the present invention provides a light output structure, including a light source component and the above-mentioned lens, 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 component is provided below or inside the light incident cavity.

[0038] In a third aspect, the present invention provides a lighting device comprising the above-mentioned light emitting structure, wherein all 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, the present invention has at least the following benefits:

[0040] 1. The lens provided by the present invention, on the one hand, achieves a high central light intensity and a uniform light spot by combining a first sub-lens with a Fibonacci sequence Fermat spiral distribution at the light entrance and a Fresnel lens at the light exit. On the other hand, a second light entrance portion, which is convex toward the optical axis and has a parabolic structure, controls the light to converge toward the center, thereby obtaining a narrower light distribution curve. Combined with a sub-reflector with a micro-prismatic flake structure on the side and a second sub-lens with a regular hexagonal light exit, secondary light mixing is performed to improve light energy utilization and achieve uniform illumination.

[0041] 2. In the light-emitting structure and lighting device provided by the present invention, the light emitted by the light source component overlaps and complements each other in the lighting area after passing through the lens body, thereby obtaining a higher central light intensity and light energy utilization rate, and improving lighting uniformity to meet lighting needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of the structure of the lens of Example 1 of the present invention.

[0043] Figure 2 for Figure 1 Sectional view along section line AA.

[0044] Figure 3 This is a bottom view of the lens according to Example 1 of the present invention.

[0045] Figure 4 for Figure 3 Schematic diagram of the enlarged portion B.

[0046] Figure 5 1 is a top view of the lens according to embodiment 1 of the present invention.

[0047] Figure 6 for Figure 5 Enlarged schematic diagram of part C.

[0048] Figure 7 Schematic diagram of the optical path of part of the light in Example 1 of the present invention.

[0049] Figure 8 FIG. 1 is a schematic diagram of the optical path of another portion of light according to Example 1 of the present invention.

[0050] Figure 9 Schematic diagram of the projection of the first light incident surface on the first plane according to embodiment 1 of the present invention.

[0051] Figure 10 This is a schematic diagram of the first light incident surface splitting the light beam in accordance with embodiment 1 of the present invention.

[0052] Figure 11 This is a simplified schematic diagram of the on-axis spherical aberration of the first light emitting surface according to Example 1 of the present invention.

[0053] Figure 12 Schematic diagram of the second light incident surface presenting a parabolic structure according to embodiment 1 of the present invention.

[0054] Figure 13 Schematic diagram of light reflected by the total reflection surface after entering the second light incident surface in embodiment 1 of the present invention.

[0055] Figure 14 Schematic diagram comparing the light paths when the second light incident surface is a parabola and a straight line in embodiment 2 of the present invention.

[0056] Figure 15 This is a comparison diagram of light distribution curves when the second light incident surface is a parabola and a straight line according to Example 2 of the present invention.

[0057] Figure 16 This is a comparison diagram of the light spots when the second light incident surface is a parabola and a straight line in Example 2 of the present invention.

[0058] Figure 17 This is a schematic diagram of the decomposition of the light output structure of Example 3 of the present invention.

[0059] Markings in the figure:

[0060] 100-lens;

[0061] 10-lens body, 1-light entrance, 2-side, 3-light exit;

[0062] 11-first light incident surface, 12-second light incident surface, 13-light incident cavity;

[0063] 101-light input end, 10-light output end, 110-center 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, 300-light output structure. DETAILED DESCRIPTION

[0069] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings and specific examples. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention 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 comprehensive understanding of the disclosure of the present invention.

[0070] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0071] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely 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 those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0073] Example 1

[0074] See also Figures 1-13 This embodiment provides a lens 100 for processing light emitted by a light source 200. The lens 100 includes a lens body 10 having an optical axis L. The lens body 10 includes a light input portion 1, a side portion 2, and a light output portion 3. The light input portion 1 includes a first light input surface 11 and a second light input surface 12, wherein the second light input surface 12 is located outside the first light input surface 11. A first sub-lens 111 is arranged on the first light input surface 11 in a Fibonacci sequence Fermat spiral pattern.

[0075] The side portion 2 is connected to the light incident portion 1 and the light exit portion 3 , and includes a total reflection surface 21 .

[0076] The light emitting portion 3 includes a first light emitting surface 31 and a second light emitting surface 32 . The second light emitting surface 32 is arranged outside the first light emitting surface 31 . Second sub-lenses 321 distributed in an array are provided on the second light emitting surface 32 .

[0077] refer to Figure 7 and Figure 8 A portion of the light emitted from the light source 200 enters the lens body 10 through the first light incident surface 11 and is emitted from the first light emitting surface 31 .

[0078] Another portion of the light enters the lens body 10 through the second light incident surface 32 , is reflected by the total reflection surface 21 , and is finally emitted from the second light emitting surface 32 .

[0079] Specifically, the lens body 10 has a bowl-shaped or hemispherical structure, with the end of the lens body 10 close to the light source 200 being the light input end 101, and the end away from the light source 200 being the light output end 102. The light input portion 1 is recessed from the light input end 101 toward the light output end 102, forming a light input cavity 13. The light input cavity 13 is formed by a first light input surface 11 and a second light input surface 12, that is, the first light input surface 11 and the second light input surface 12 define the top surface and side surfaces of the light input cavity 13. The first sub-lens 111 provided on the first light input surface 11 follows the Fermat spiral distribution of the Fibonacci sequence.

[0080] The first light exit surface 31 has a Fresnel lens structure and includes 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 exit surface 31, the first ring body 311 is connected to the convex lens 310, and the third ring body 313 is located at the outermost side of the first light exit surface 31 and is connected to the second light exit surface 32.

[0081] A portion of the light emitted by the light source 200 enters the lens body 10 through the first light incident surface 11 and is emitted from the first light emitting surface 31. In this light emission path, the light first enters the lens body 10 through the first light incident surface 11 of the first sub-lens, which has a compound-eye structure and a Fibonacci spiral distribution, and then is emitted from the first light emitting surface 31, which has a Fresnel lens structure, to the illumination area, thereby achieving a higher central light intensity and a more uniform illumination spot.

[0082] The lens body 10 is rotationally symmetric about the optical axis L, which also serves as the centerline of the lens body 10. On the first light-entering surface 11, the first sub-lens passing through the optical axis L is the central sub-lens 110. The remaining first sub-lenses 111 are arranged around the central sub-lens 110 in a Fibonacci spiral.

[0083] Combined with reference Figure 2 and Figure 9, the end of the lens body 10 closest to the light source, i.e., the plane where the light incident end 101 is located, is taken as the reference plane P0, and the point where the central sub-lens 101 intersects the optical axis L is taken as the origin O. On a first plane P1 passing through the origin O and parallel to the reference plane P0, the coordinate axes (x, y) are established. The projection of the first light incident surface 11 on 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 and the X-axis in the positive direction of 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 lenslet structure, which is arranged according to the Fibonacci sequence and Fermat spiral, so that the light entering the first light incident surface is dispersed but controlled within a certain range, thereby achieving precise light control.

[0092] Combined with reference Figure 9 and Figure 10 After this portion of light emitted by the light source passes through the first light-entry surface 11, the entire illumination beam is split into N channels (N is the total number of first sub-lenses). Each first sub-lens 111 independently forms an image of the light source, thus forming images of N light sources, which are called secondary light sources. Because the entire incident wide beam is split into N channels of fine beams, the uniformity within each fine beam must be greater than the uniformity within the entire wide beam.

[0093] However, due to the existence of lens spherical aberration, the improvement of light uniformity by the first sub-lens 111 with a compound eye structure is also limited. In this embodiment, the first light-emitting surface 31 with a Fresnel lens structure is designed to reduce the lens spherical aberration, thereby further improving the lighting uniformity.

[0094] Further references Figure 2In the first light-emitting surface 31, the plane where the end of the lens body 10 is away from the light source, that is, the light-emitting end 102 is located, is the second plane P2, and 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 relationship: H0

[0096] Wherein, H0, H1, H2, and H3 are the distances between the top of the convex lens 310, the top of the first ring body 311, the top of the second ring body 312, and the top of the third ring body 313 and the first plane P1 respectively.

[0097] As described above, the lens body 10 has a rotationally symmetrical structure, and the rotation axis is the lens optical axis L. Since off-axis spherical aberration and on-axis spherical aberration have substantially the same properties, on-axis spherical aberration will be used for the purpose of simplifying the description.

[0098] Combined with reference Figure 2 and Figure 11 On the first light exit surface 31, the convex lens 310 at the center and the third ring 313 at the outermost edge play a decisive role in the spherical aberration of the Fresnel lens. Therefore, this embodiment reduces the spherical aberration of the Fresnel lens by lowering the center height of the convex lens 310 and increasing the outer height of the third ring 313 at the outermost edge.

[0099] Specifically, this embodiment increases the number of concentric Fresnel lens rings, increases the height of the central convex lens, and increases the height of the outermost third ring. Taking into account light energy loss, processing complexity, and spot layering, this embodiment adopts a four-layer structure, namely a Fresnel design with a gradual height gradient from the central convex lens to the outermost third ring. Specifically, 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, respectively, to the first plane P1.

[0100] The secondary light source is focused after passing through the first light-emitting surface with the Fresnel lens structure, and is inverted and overlapped in the illumination area to compensate for each other, thereby obtaining a more uniform illumination 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 is emitted from the first light emitting surface 31 .

[0102] The first sub-lens on the first light incident surface, which is arranged in the Fermat spiral pattern according to the Fibonacci sequence and has a compound eye structure, cooperates with the Fresnel lens structure on the first light exit surface to make the illumination spot more uniform while maintaining a high light energy utilization rate and central light intensity. ​

[0103] Furthermore, the first light incident surface 11 is a curved surface convex toward the reference plane P0 , and the second light incident surface 12 is a curved surface convex toward the optical axis L.

[0104] In the second light-emitting path, light enters the lens body 10 through the second light-incident surface 32 , is reflected by the total reflection surface 21 , and finally exits from the second light-emitting surface 32 .

[0105] Specifically, in the cross section of the lens body 10 passing through the optical axis L, the second light incident surface 12 is a parabola convex toward the optical axis L, and its expression is: y=kx 2 (0<x1<x2), where k is a constant greater than 0.

[0106] Combined with 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 D1 emitted by the light source component 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 light ray D1 and the reference plane,

[0111] α is the angle between the tangent line F1 at the incident point M and the reference plane,

[0112] β is the angle between the tangent F1 of the incident point M and the tangent F2 of the parabola where the second light incident surface is located,

[0113] δ is the angle between the refracted light D2 and the incident light D1, that is, the angle at which the incident light D1 is refracted;

[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 light D2 is in the same direction as the incident light D1;

[0117] When tan -1 When (2kx)+θ<90°, δ>0; the refracted light D2 is deflected upward compared to the incident light D1. The smaller x and θ are, the greater the upward deflection angle is.

[0118] When tan -1 When (2kx)+θ>90°, δ<0; the refracted light D2 is deflected downward compared to the incident light D1. The larger the x and θ are, the greater the downward deflection angle is.

[0119] That is, after the incident light D1 is refracted by the second light incident surface 12 having a parabolic structure, the outgoing light will be more focused, and the focusing effect of the edge light will be more obvious.

[0120] Figure 13 This is a schematic diagram of the light that enters the second light incident surface and is reflected by the total reflection surface. In 13A, both x and θ change; in 13B, x changes and θ remains unchanged; in 13C, x remains unchanged and θ changes. Figure 12 and Figure 13 ,

[0121] Where I is the light source center of the light source element 200, and the red light is tan -1 When (2kx)+θ=90°, the incident light is tan -1 When (2kx)+θ≠90°, the green light is the incident light after being refracted by the parabolic second light-entry surface 12. The refracted light's beam width is smaller than the original incident light's, reducing the beam width of the reflected light after total internal reflection 21 and increasing the probability of light crossing the central light. This shows that the use of a parabolic second light-entry surface combined with a total internal reflection surface allows for precise light control of the second light output path, reduces edge stray light, and achieves a more uniform light spot color. This also increases the central light spot's illumination area and central light intensity.

[0122] Back to Figure 1 In the side portion 2, the total reflection surface 21 is a curved surface that is concave away from the optical axis L. The total reflection surface 21 is provided with a sub-reflector 211 having a micro-prismatic flake structure. In this embodiment, the sub-reflector 211 having a micro-prismatic flake structure is used to form the total reflection surface. This sub-reflector has a micro-spherical structure. After being refracted by the second light incident surface, the light is further reflected by the sub-reflector 211, resulting in cross-mixing to achieve 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 is a regular hexagon and has a compound-eye structure, so that the illumination distribution on the illuminated area is more uniform.

[0124] The lens provided in this embodiment achieves high central light intensity and a uniform light spot through the combination of a first sub-lens with a Fibonacci spiral-like distribution at the light entrance and a Fresnel lens at the light exit. Furthermore, a second light entrance, convex toward the optical axis and with a parabolic structure, controls the light to converge toward the center, thereby achieving a narrow light distribution curve. Combined with a sub-reflector with a micro-prismatic flake structure on the side and a second sub-lens with a regular hexagonal light exit, secondary light mixing is performed to improve light energy utilization and achieve uniform illumination. Furthermore, the lens reduces lens volume and saves material, achieving lightweight and thinness while focusing light to form a uniform light spot.

[0125] Example 2

[0126] This embodiment compares the light emission effects when the second light incident surface is a parabola and a straight line. Figure 14 As shown, 14A is a comparison of the optical paths of the light emitted from the light source center I, which passes 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 optical paths of the light emitted from the left side of the light source center I, which passes 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 optical paths of the light emitted from the right side of the light source center I, which passes through the second light incident surface 22 of the parabola and the third light incident surface 25 of the straight line.

[0127] The blue light is the incident light, the green light is the refracted light after being refracted by the parabolic second light incident surface 22 , and the pink light is the refracted light after being refracted by the linear third light incident surface 25 .

[0128] Compared with the refracted light after being refracted by the linear third light incident surface 25, the refracted light after being refracted by the parabolic second light incident surface 22 is more concentrated, and the beam width of the reflected light after being reflected by the total reflection surface is smaller and the probability of light crossing is higher.

[0129] Figure 15 The comparison diagram of the light distribution curves when the second light incident surface of this embodiment is a parabola and a straight line. Among them, 15A corresponds to the light distribution curve when the second light incident surface is a parabola, and 15B corresponds to the light distribution curve when the second light incident surface is a straight line. Figure 15 As shown, when the second light incident surface has a parabolic structure, the central light intensity and K value are significantly improved.

[0130] Figure 16 16A is a comparison diagram of the light spots when the second light incident surface is a parabola and a straight line. 16B is a comparison diagram of the light spots when the second light incident surface is a straight line. Figure 16 As shown, when the second light incident surface is 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 output structure 300, comprising a light source component 200 and the lens 100 of Example 1. In the lens 100, the light input portion 1 is provided with a light input cavity 13, which is formed by a first light input surface 11 and a second light input surface 12. The light source component 200 is disposed below or inside the light input cavity. In the light output structure provided by this embodiment, the light emitted by the light source component, after passing through the lens body, overlaps and complements each other in the illumination area, thereby obtaining a higher central light intensity, light energy utilization rate, and improving illumination uniformity.

[0133] Example 4

[0134] This embodiment provides a lighting device, including the light emitting structure 300 of embodiment 3. All the light emitted by the light source 200 enters the light incident cavity 13 and is received by the first light incident surface 11 and the second light incident surface 12 .

[0135] In the lighting device provided in this embodiment, the light emitted by the light source component overlaps and complements each other in the lighting area after passing through the lens body, thereby obtaining a higher central light intensity and light energy utilization rate, improving lighting uniformity, and meeting lighting needs.

[0136] The above description is merely an example and illustration of the structure of the present invention. Although the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present invention, and such obvious alternatives are all within the scope of protection of the present invention.

Claims

1. A lens for processing light emitted by a light source, characterized in that: The lens comprises a lens body having an optical axis, the lens body comprising: The light incident portion includes a first light incident surface and a second light incident surface provided outside the first light incident surface, wherein the first light incident surface is provided with first sub-lenses distributed in a Fibonacci sequence Fermat spiral pattern; a side portion, including a fully reflective surface; a light emitting portion comprising a first light emitting surface and a second light emitting surface provided outside the first light emitting surface, wherein the second light emitting surface is provided with second sub-lenses distributed in an array; A portion of the light emitted by the light source enters the lens body through the first light incident surface and is emitted from the first light emitting surface; another portion enters the lens body through the second light incident surface and is reflected by the total reflection surface before being emitted from the second light emitting surface.

2. The lens according to claim 1, wherein The first light-emitting surface includes a convex lens and a first ring body, a second ring body and a third ring body arranged outside the convex lens. The first ring body is connected to the convex lens, and the third ring body is connected to the second light-emitting surface.

3. The lens according to claim 2, wherein: The lens body is a rotationally symmetrical body with the optical axis as the rotation axis; the first light incident surface is provided with a central sub-lens passing through the optical axis, and the first sub-lenses are arranged around the central sub-lens in the form of a Fermat spiral of the Fibonacci sequence.

4. The lens according to claim 3, wherein The plane where one end of the lens body close to the light source is located is used as a reference plane, and the point where the central sub-lens intersects the optical axis is used as the origin O. On a first plane passing through the origin O and parallel to the reference plane, a coordinate axis (x, y) is established. The projection of the first light incident surface on the first plane has the 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 and the X-axis in the positive direction of 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 where the end of the lens body away from the light source is located as the second plane, the convex lens, the first ring body, the second ring body and the third ring body are all convex toward the second plane, and the first light-emitting surface has the relationship: H0<H1<H2<H3; Among them, H0, H1, H2, and H3 are respectively the distances between the top of the convex lens, the top of the first ring body, the top of the second ring body, and the top of the third ring body and the first plane.

6. The lens according to claim 1, wherein Taking the plane where one end of the lens body close to the light source is located as a reference plane, the first light incident surface is a curved surface convex toward the reference plane, and the second light incident surface is a curved surface convex toward the optical axis; In the cross section of the lens body passing through the optical axis, the second light incident surface is a parabola convex toward the optical axis, and its expression is: y = kx 2 (0<x1<x2), Wherein, k is a constant greater than 0.

7. The lens according to claim 6, wherein: The incident light emitted by the light source enters the second light incident surface and intersects at the incident point M, with the relationship: α=tan -1 (2kx), β=90°-(α+θ)=90°-[tan -1 (2kx)+θ], Where θ is the angle between the incident light and the reference plane, α is the angle between the tangent line of the incident point M and the reference plane, β is the angle between the tangent line of the incident point M and the tangent line of the parabola where the second light incident surface is located, δ is the angle between the refracted light and the incident light, n' is the refractive index of the lens material.

8. The lens according to claim 1, wherein 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 in a micro-prismatic flake structure; The second sub-lens has a regular hexagonal structure.

9. The light emitting structure is characterized in that: It comprises a light source component and the lens according to any one of claims 1 to 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 component is provided below or inside the light incident cavity.

10. A lighting device, characterized in that Including the light emitting structure according to claim 9, all the light emitted by the light source component enters the light incident cavity and is received by the first light incident surface and the second light incident surface.

Images