An illumination device and a mobile terminal

Abstract

The application belongs to the technical field of optical equipment, and discloses an illuminating device and a mobile terminal, wherein the illuminating device comprises: a plurality of emitting light sources for emitting first light beams; a plurality of lens assemblies respectively arranged on one side of the plurality of emitting light sources along an optical axis direction, wherein the lens assembly comprises a first lens group and a second lens group, the first lens group is arranged between the emitting light source and the second lens group along the optical axis direction, and the first lens group is used for converging the first light beam and emitting a second light beam; in the optical axis direction, the interval distance between the second lens group and the first lens group in each lens assembly is different, and the second lens group in each lens assembly can refract each second light beam and emit a third light beam with different light beam angles. The application can solve the technical problem that the single illumination angle light source on the mobile phone cannot adapt to the multiple field angles of the mobile phone lens in the prior art.

Description

Technical Field

[0001] This application belongs to the field of optical equipment technology, specifically relating to a lighting device and a mobile terminal. Background Technology

[0002] Currently, most mobile phones and smart terminals use a single-angle illumination source, generally based on the maximum field of view of the camera lens. However, as new mobile phones increasingly utilize wide-angle and telephoto zoom functions, achieving zoom capabilities 3-10 times greater than traditional digital cameras, a single-angle illumination source cannot accommodate the multiple field of view of the mobile phone lens. Utility Model Content

[0003] The purpose of this application is to provide a lighting device and a mobile terminal to solve the technical problem of large light source volume on mobile phones in the prior art.

[0004] To achieve the above objectives, an embodiment of the first aspect of this application provides a lighting device, comprising: a plurality of emitting light sources for emitting a first light beam; a plurality of lens assemblies respectively disposed on one side of the plurality of emitting light sources along the optical axis, the lens assemblies including a first lens group and a second lens group, the first lens group being disposed between the emitting light source and the second lens group along the optical axis, the first lens group being used to converge the first light beam and emit a second light beam; in the optical axis direction, the interval distance between the second lens group and the first lens group in each lens assembly is different, and the second lens group in each lens assembly is capable of refracting each second light beam and emitting a third light beam with a different beam angle.

[0005] In some embodiments, the lens assembly further includes a collimating lens disposed between the light source and the first lens group, the collimating lens being used to collimate the first light beam and direct it toward the first lens group.

[0006] In some embodiments, the collimating lens is a total internal reflection collimating lens. The side of the total internal reflection collimating lens away from the emitting light source along the optical axis is a plane. The side of the total internal reflection collimating lens close to the emitting light source along the optical axis is provided with a refractive body and a plurality of annular reflecting prisms. The axis of the refractive body coincides with the center line of the emitting light source, and the plurality of reflecting prisms are arranged around the refractive body. Alternatively, the collimating lens is one of an aspherical collimating lens, a superlens, and a diffractive optical element.

[0007] In some embodiments, the first lens group includes a plurality of first lens units, which are arranged in an array on a plane perpendicular to the optical axis; the second lens group includes a plurality of second lens units corresponding to the first lens units, which are arranged in an array on a plane perpendicular to the optical axis.

[0008] In some embodiments, the first lens unit is any one of a spherical lens, an aspherical lens, a Fresnel lens, a planar diffractive optical lens, and a planar superlens; and / or, the second lens unit is any one of a spherical lens, an aspherical lens, a Fresnel lens, a planar diffractive optical lens, and a planar superlens.

[0009] In some embodiments, a plurality of first lens units are arranged in a rectangular array; a plurality of second lens units are arranged in a rectangular array.

[0010] In some embodiments, in the lens assembly where the distance between the second lens group and the first lens group along the optical axis is the smallest, the focal length of the first lens group is greater than the distance between the optical center of the first lens group and the second lens group; in the lens assembly where the distance between the second lens group and the first lens group along the optical axis is the largest, the focal length of the first lens group is less than the distance between the optical center of the first lens group and the second lens group.

[0011] In some embodiments, the lens assembly further includes a light-blocking plate disposed between the first lens group and the second lens group. The light-blocking plate has a plurality of light-transmitting holes, each of which corresponds to a plurality of first lens units and a plurality of second lens units.

[0012] In some embodiments, the light-blocking plate is made of black material, and the thickness of the light-blocking plate along the optical axis is less than or equal to 0.2 mm; and / or, the aperture of the light-transmitting hole is less than or equal to 0.3 mm.

[0013] In some embodiments, in the optical axis direction, multiple light-blocking plates in multiple lens assemblies are disposed on the same plane perpendicular to the optical axis direction.

[0014] In some embodiments, a plurality of first lens groups in a plurality of lens assemblies are disposed on the same plane perpendicular to the optical axis.

[0015] In some embodiments, multiple collimating lenses in a plurality of lens assemblies are disposed on the same plane perpendicular to the optical axis.

[0016] In some embodiments, multiple emitting light sources are distributed in a rectangular or hexagonal array on a plane perpendicular to the optical axis, and the orthographic projections of multiple lens assemblies are distributed in a rectangular or hexagonal array on a projection plane perpendicular to the optical axis.

[0017] An embodiment of the second aspect of this application also provides a mobile terminal, including the lighting device of any one of the embodiments of the first aspect.

[0018] The beneficial effects of the lighting device and mobile terminal provided in this application are as follows: the second lens group and the first lens group in each lens assembly have different spacing distances, which enables the third beam emitted by different lens assemblies to have different beam angles, thereby allowing the area and illuminance illuminated by the third beam to be changed according to actual needs; the lighting device can be used as a mobile phone flash, and when the mobile phone lens zooms to shoot different areas, the third beam can illuminate the corresponding shooting area by switching the emitted light source in the lighting device. This application is applicable to the lighting needs of wide-angle and telephoto mobile phones, and can solve the technical problem that a light source with a single illumination angle cannot adapt to the multiple field of view angles of a mobile phone lens, and each component can be fixedly set on the mobile phone, resulting in high stability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 Schematic diagram of a lighting device provided in some embodiments of this application;

[0021] Figure 2 An exploded isometric view of a lighting device provided in some embodiments of this application;

[0022] Figure 3 An exploded side view of a lighting device provided in some embodiments of this application;

[0023] Figure 4 Schematic diagram of a collimating lens provided for some embodiments of this application Figure 1 ;

[0024] Figure 5 This is a schematic diagram of the optical path of light passing through a total internal reflection collimating lens, provided in some embodiments of this application;

[0025] Figure 6 A schematic diagram of a total internal reflection collimating lens provided for some embodiments of this application;

[0026] Figure 7 A schematic diagram of the splicing of multiple collimating lenses provided in some embodiments of this application. Figure 1 ;

[0027] Figure 8 A schematic diagram illustrating the collimation of a first beam by multiple collimating lenses according to some embodiments of this application;

[0028] Figure 9The parameter values ​​of the collimating lens in the lighting device provided in some embodiments of this application are as follows:

[0029] Figure 10 A schematic diagram of the splicing of multiple collimating lenses provided in some embodiments of this application. Figure 2 ;

[0030] Figure 11 for Figure 10 Axonometric view of multiple collimating lenses;

[0031] Figure 12 The parameter value of the collimating lens in the lighting device provided in some embodiments of this application is two;

[0032] Figure 13 Schematic diagram of a collimating lens provided for some embodiments of this application Figure 2 ;

[0033] Figure 14 The parameter values ​​of the collimating lens in the lighting device provided in some embodiments of this application are three;

[0034] Figure 15 Schematic diagram of a first lens unit and a second lens unit provided for some embodiments of this application Figure 1 ;

[0035] Figure 16 For light to pass through Figure 15 Schematic diagram of the optical path of the first lens unit and the second lens unit in the diagram;

[0036] Figure 17 Schematic diagram of a first lens unit and a second lens unit provided for some embodiments of this application Figure 2 ;

[0037] Figure 18 For light to pass through Figure 17 Schematic diagram of the optical path of the first lens unit and the second lens unit in the diagram;

[0038] Figure 19 Schematic diagram of a first lens unit and a second lens unit provided for some embodiments of this application Figure 3 ;

[0039] Figure 20 For light to pass through Figure 19 Schematic diagram of the optical path of the first lens unit and the second lens unit in the diagram;

[0040] Figure 21 Schematic diagram of a first lens unit and a second lens unit provided for some embodiments of this application Figure 4 ;

[0041] Figure 22 For light to pass through Figure 21Schematic diagram of the optical path of the first lens unit and the second lens unit in the diagram;

[0042] Figure 23 Schematic diagram of a first lens unit and a second lens unit provided for some embodiments of this application Figure 5 ;

[0043] Figure 24 For light to pass through Figure 23 Schematic diagram of the optical path of the first lens unit and the second lens unit in the diagram;

[0044] Figure 25 Schematic diagram of a first lens unit and a second lens unit provided for some embodiments of this application Figure 6 ;

[0045] Figure 26 For light to pass through Figure 25 Schematic diagram of the optical path of the first lens unit and the second lens unit in the diagram;

[0046] Figure 27 Schematic diagram of a first lens unit and a second lens unit provided for some embodiments of this application Figure 7 ;

[0047] Figure 28 For light to pass through Figure 27 Schematic diagram of the optical path of the first lens unit and the second lens unit in the diagram;

[0048] Figure 29 Schematic diagram of a first lens unit and a second lens unit provided for some embodiments of this application Figure 8 ;

[0049] Figure 30 For light to pass through Figure 29 Schematic diagram of the optical path of the first lens unit and the second lens unit in the diagram;

[0050] Figure 31 Schematic diagram of a first lens unit and a second lens unit provided for some embodiments of this application Figure 9 ;

[0051] Figure 32 For light to pass through Figure 31 Schematic diagram of the optical path of the first lens unit and the second lens unit in the diagram;

[0052] Figure 33 Schematic diagram of a first lens unit and a second lens unit provided for some embodiments of this application Figure 10 ;

[0053] Figure 34 For light to pass through Figure 33 Schematic diagram of the optical path of the first lens unit and the second lens unit in the diagram;

[0054] Figure 35 Schematic diagram of a first lens unit and a second lens unit provided for some embodiments of this application Figure 10 one;

[0055] Figure 36 For light to pass through Figure 35 Schematic diagram of the optical path of the first lens unit and the second lens unit in the diagram;

[0056] Figure 37 A schematic diagram of a first lens group provided for some embodiments of this application;

[0057] Figure 38 Schematic diagrams of the optical path design of the first lens unit and the second lens unit provided for some embodiments of this application;

[0058] Figure 39 The parameter values ​​of the components in the lighting device provided in some embodiments of this application are as follows:

[0059] Figure 40 The parameter values ​​of the components in the lighting device provided in some embodiments of this application are two;

[0060] Figure 41 The simulation effect of light refraction by the first and second lens groups provided in some embodiments of this application Figure 1 ;

[0061] Figure 42 A schematic diagram of the illuminance of a light spot formed by a third beam emitted by a lighting device provided in some embodiments of this application;

[0062] Figure 43 Simulation effect of light refraction by the first and second lens groups provided in some embodiments of this application Figure 2 ;

[0063] Figure 44 A schematic diagram of the illuminance of a light spot formed by a third beam emitted by a lighting device provided in some embodiments of this application;

[0064] Figure 45 The parameter values ​​of the components in the lighting device provided in some embodiments of this application are three;

[0065] Figure 46 The parameter values ​​of the components in the lighting device provided in some embodiments of this application are four;

[0066] Figure 47 A schematic diagram of a collimating lens and light source assembly provided in some embodiments of this application;

[0067] Figure 48 A schematic diagram of the splicing of multiple collimating lenses provided in some embodiments of this application. Figure 3 ;

[0068] Figure 49 This is a schematic diagram illustrating the splicing of a collimating lens and an intermediate collimating lens according to some embodiments of this application.

[0069] The following are the labeling elements in the figure:

[0070] 1000. Lighting device;

[0071] 100. Lens assembly;

[0072] 11. First beam; 12. Second beam; 13. Third beam; 14. Projected light field;

[0073] 20. Collimating lens; 21. Refracting body; 22. Reflecting prism; 221. Incident surface; 222. Reflecting surface; 23. Fifth surface; 24. Sixth surface;

[0074] 30. First lens group; 31. First lens unit; 311. First surface; 312. Second surface;

[0075] 40. Light-blocking plate; 41. Light-transmitting hole;

[0076] 50. Second lens group; 51. Second lens unit; 511. Third surface; 512. Fourth surface;

[0077] 60. Intermediate collimating lens;

[0078] 200. Emitting light source. Detailed Implementation

[0079] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0080] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0081] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0082] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0083] The first aspect of this application provides a lighting device for use in devices such as mobile phones or cameras. This application uses the lighting device as a mobile phone flash as an example for illustration. It can be understood that the lighting device can also be used for camera auxiliary lighting devices of artificial intelligence devices, camera auxiliary lighting devices of AR glasses (Augmented Reality Goggles) and VR glasses (Virtual Reality Glasses), camera auxiliary lighting devices of tablet computers, camera auxiliary lighting devices of autonomous driving vehicles, camera auxiliary lighting devices of robots, and other devices with light sources.

[0084] An embodiment of the first aspect of this application provides a lighting device 1000. Please refer to... Figures 1 to 3 The lighting device 1000 includes multiple light sources 200 and multiple lens assemblies 100. The light sources 200 are used to emit a first light beam 11. The multiple lens assemblies 100 are respectively disposed on one side of the multiple light sources 200 along the optical axis direction X. The lens assembly 100 includes a first lens group 30 and a second lens group 50. The first lens group 30 is disposed between the light source 200 and the second lens group 50 along the optical axis direction X. The first lens group 30 is used to converge the first light beam 11 and emit a second light beam 12. In the optical axis direction X, the spacing between the second lens group 50 and the first lens group 30 in each lens assembly 100 is different. The second lens group 50 in each lens assembly 100 can refract each second light beam 12 and emit a third light beam 13 with different beam angles.

[0085] The emitting light source 200 is used to emit a first beam 11 into the first lens group 30. Optionally, the emitting light source 200 may include a light-emitting diode or a surface-mount light-emitting diode, which has high luminous efficiency. Optionally, the emitting light source 200 may also be a laser light source, which has high brightness. Optionally, multiple emitting light sources 200 are arranged on the same plane in the direction perpendicular to the optical axis X, and the size of the illumination device 1000 in the direction of the optical axis X is small, which is suitable for smaller installation spaces.

[0086] Multiple lens assemblies are located on the same side of multiple emitting light sources, and each lens assembly corresponds to a different emitting light source. For each emitting light source, there is a lens assembly used to receive the first beam emitted by that emitting light source.

[0087] The first lens group 30 has a real focal point, which is the intersection point of incident light rays parallel to the principal optical axis of the first lens group 30 after refraction by the first lens group 30. The first lens group 30 is used to converge the first beam 11 and emit the second beam 12, making the beam angle of the second beam 12 smaller than the beam angle of the first beam 11. Optionally, the first lens group 30 can be a spherical convex lens or an aspherical convex lens, etc. Optionally, the material of the first lens group 30 can include optical resin materials such as polycarbonate (PC resin), polymethyl methacrylate (PMMA resin), polymethyl methacrylimide (PMMI resin), cycloolefin copolymer (COC resin), polyamide 12 (PA12 transparent resin), or polysulfone resin, which have high light transmittance and are relatively lightweight. Optionally, the first lens group 30 can also include optical silicone material, which has good temperature resistance. Optionally, the first lens group 30 may also include a nano-imprinted UV adhesive material to facilitate the fabrication of high-precision lenses.

[0088] The second lens group 50 is located on the side of the first lens group 30 away from the emitting light source 200 along the optical axis direction X. The spacing between the second lens group 50 and the first lens group 30 in each lens assembly 100 is different, the focal length of each lens assembly 100 is different, and the refractive ability of each lens assembly 100 for the first beam 11 is different. Consequently, the final divergence degree of the third beam 13 emitted after the first beam 11 is refracted by the lens assembly 100 is different, and each second lens group 50 can emit a third beam with a different beam angle.

[0089] Optionally, each first lens group 30 can be arranged on the same plane in the direction perpendicular to the optical axis X, and each second lens group can be arranged on different planes in the direction perpendicular to the optical axis X, so that the spacing between the second lens group 50 and the first lens group 30 in each lens assembly 100 is different. The size of the lens assembly 100 in the direction perpendicular to the optical axis X is smaller, which is suitable for smaller installation space.

[0090] Optionally, each second lens group 50 can be arranged on the same plane in the direction perpendicular to the optical axis X, and each first lens group can be arranged on different planes in the direction perpendicular to the optical axis X, so that the spacing between the second lens group 50 and the first lens group 30 in each lens assembly 100 is different. The size of the lens assembly 100 in the direction perpendicular to the optical axis X is smaller, which is suitable for smaller installation space.

[0091] Optionally, the material of the second lens group 50 may include optical resins such as polycarbonate (PC resin), polymethyl methacrylate (PMMA resin), polymethyl methacrylimide (PMMI resin), cycloolefin copolymer (COC resin), polyamide 12 (PA12 transparent resin), or polysulfone resin, which have high light transmittance and are relatively lightweight. Optionally, the second lens group 50 may also include optical silicone material, which has good temperature resistance. Optionally, the second lens group 50 may also include nano-imprinted UV adhesive material, which facilitates the manufacture of high-precision lenses. Optionally, the multiple first lens groups 30 may also be different types of lenses such as spherical lenses and aspherical lenses, which can achieve the effects of various lenses.

[0092] Optionally, the second lens group 50 may have a virtual focal point, which is the intersection of the backward extensions of incident light rays parallel to the principal optical axis of the second lens group 50 after refraction by the second lens group 50. The second lens group 50 is used to diverge the second beam 12 and emit a third beam 13, making the beam angle of the third beam 13 larger than that of the second beam 12. The light rays of the third beam 13 are more dispersed, enabling it to illuminate a larger area at close range. For example, the second lens group 50 may be a concave lens.

[0093] Optionally, the second lens group 50 may also have a real focal point. The second lens group 50 is used to converge the second beam 12 and emit the third beam 13, so that the beam angle of the third beam 13 is smaller than that of the second beam 12. The light from the third beam 13 is more concentrated, and it can illuminate a farther distance. For example, the second lens group 50 may be a convex lens.

[0094] The third beam 13 emitted from the second lens group 50 is a diverging beam at the end furthest from the second lens group 50. Optionally, the third beam 13 can be a diverging beam, with its diameter gradually increasing from the second lens group 50 towards the direction away from the first lens group 30 along the optical axis X. Optionally, the third beam 13 can also first converge to a point and then diverge, with its diameter first decreasing and then gradually increasing from the second lens group 50 towards the direction away from the first lens group 30 along the optical axis X.

[0095] For example, in use, the first emitting light source 200 is turned on, emitting a first beam 11 towards the corresponding first lens group 30. The first lens group 30 converges the first beam 11 and emits a second beam 12 towards the second lens group 50. The second lens group 50 refracts the second beam 12 and emits a third beam 13. Then, the first emitting light source 200 is turned off, and the second emitting light source 200 is turned on. The emitting light source 200 emits a first beam 11 towards the corresponding lens assembly 100. The lens assembly 100 refracts the first beam 11 and emits a third beam 13 with a different beam angle than the previous third beam 13, thereby changing the beam angle of the third beam 13. The lighting device 1000 can be used as a mobile phone flash. When the mobile phone camera is switched to a short focal length for close-up shooting, the switching light source 200 controls the beam angle of the third beam 13 to increase, so that the third beam 13 can illuminate a larger area at close range and adapt to the shooting area. When the mobile phone camera is switched to a long focal length for distant shooting, the switching light source 200 controls the beam angle of the third beam 13 to decrease, so that the third beam 13 can illuminate a more distant area at close range and adapt to the shooting area.

[0096] For example, multiple light sources 200 can be turned on simultaneously during use, so that multiple lens components 100 emit third beams 13 with different beam angles. When the lighting device 1000 is used as a mobile phone flash, it can illuminate both near and far objects at the same time, making it convenient for the mobile phone camera to capture both close-up and distant scenes simultaneously.

[0097] The beneficial effects of this application embodiment are as follows: the spacing between the second lens group 50 and the first lens group 30 in each lens assembly 100 is different, which enables the third beam 13 emitted by different lens assemblies 100 to have different beam angles, thereby allowing the area illuminated and the illuminance of the third beam 13 to be changed according to actual needs; the lighting device 1000 can be used as a mobile phone flash, and when the mobile phone lens is zooming to shoot different areas, the third beam 13 can be illuminated by switching the emitting light source 200 in the lighting device 1000. The lighting device 1000 of this application embodiment can be applied to the lighting needs of wide-angle and telephoto mobile phones, and can solve the technical problem that a light source with a single illumination angle cannot adapt to the multiple field of view of the mobile phone lens, and each component can be fixedly installed on the mobile phone, resulting in high stability.

[0098] In some embodiments, please refer to Figures 1 to 3 The lens assembly 100 also includes a collimating lens 20, which is disposed between the emitting light source 200 and the first lens group 30. The collimating lens 20 is used to collimate the first beam 11 and direct it toward the first lens group 30.

[0099] Optionally, the number of collimating lenses 20 is the same as the number of emitting light sources 200, with each collimating lens 20 corresponding to one emitting light source 200, which can effectively collimate the first beam 11.

[0100] The collimating lens 20 is used to collimate the first beam 11, making the light rays in the beam incident on the first lens group 30 parallel or nearly parallel. Optionally, the collimating lens 20 may include optical resin materials such as polycarbonate (PC resin), polymethyl methacrylate (PMMA resin), polymethyl methacrylimide (PMMI resin), cycloolefin copolymer (COC resin), polyamide 12 (PA12 transparent resin), or polysulfone resin, which have high light transmittance and are relatively lightweight. Optionally, the collimating lens 20 may also include optical silicone material, which has good temperature resistance. Optionally, the collimating lens 20 may also include nano-imprinted UV adhesive material, which facilitates the manufacture of high-precision lenses.

[0101] The beneficial effect of this application embodiment is that: the collimating lens 20 is set to collimate the first beam 11, so that the first beam 11 can be uniformly projected onto the side of the first lens group 30 close to the collimating lens 20, so that the energy in the first beam 11 is fully utilized.

[0102] In some embodiments, please refer to Figures 1 to 4 The collimating lens 20 is a total internal reflection collimating lens. The side of the total internal reflection collimating lens away from the light source along the optical axis X is a plane. The side of the total internal reflection collimating lens close to the light source along the optical axis X is provided with a refractive body 21 and multiple annular reflecting prisms 22. The axis of the refractive body 21 coincides with the center line of the emitting light source. The multiple reflecting prisms 22 are arranged around the refractive body 21.

[0103] The refractive body 21 is used to refract and collimate the light rays at the center of the first beam 11. The side of the refractive body 21 facing the emitting light source 200 along the optical axis X is convex and is positioned directly opposite the center of the light source in the emitting light source 200. The light-gathering angle θ1 of the refractive body 21 is greater than or equal to 40° and less than or equal to 80°. Optionally, the side of the refractive body 21 facing the emitting light source 200 along the optical axis X is aspherical, which has a stronger ability to converge light rays.

[0104] All reflecting prisms 22 are annular structures with their axes coinciding with the optical axis. Multiple annular reflecting prisms 22 are coaxially nested. On the projection plane perpendicular to the optical axis direction X, the diameter of the orthographic projection of multiple reflecting prisms 22 gradually increases from the direction closer to the optical axis to the direction farther away from the optical axis. The optical axis is the optical axis of each lens assembly 100, and the axis of the reflecting prism 22 coincides with the optical axis.

[0105] The reflecting prism 22 includes an annular incident surface 221 and an annular reflecting surface 222. The incident surface 221 is located on the side of the reflecting prism 22 closer to the reflector. The incident surface 221 refracts the first light beam 11 toward the reflecting surface 222, and the reflecting surface 222 reflects the first light beam 11 toward the first lens group 30, making the light rays in the first light beam 11 parallel or nearly parallel. Both the incident surface 221 and the reflecting surface 222 are conical surfaces whose axes coincide with the optical axis. Optionally, the angle C between the incident surface 221 and the optical axis is greater than or equal to 2° and less than or equal to 18°, which allows the reflecting prism 22 to be set to a smaller size and to collimate the first light beam 11, thereby reducing the size of the illumination device 1000.

[0106] For the reflecting prism 22, the geometric focusing ratio is a key factor limiting the uniformity of the light spot, and the ring spacing is the core parameter for calculating the geometric focusing ratio. The range of the ring spacing is determined through calculation and simulation. Optionally, the ring spacing D of the reflecting prism 22 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm. A smaller ring spacing D allows multiple reflecting prisms 22 to be placed in a smaller space, improving the collimation effect. On the projection plane perpendicular to the optical axis, the difference between the outer diameter and inner diameter of the orthographic projection of the reflecting prism 22 is twice the ring spacing D of that reflecting prism 22. Optionally, different reflecting prisms 22 can have the same ring spacing. Optionally, the ring spacing D of the reflecting prism 22 is 0.18 mm. Optionally, different reflecting prisms 22 can also have different ring spacings. Optionally, the total internal reflection collimating lens has a light-receiving angle A of 160°, meaning that the light-receiving angle of the reflecting prism 22, which is furthest from the refractor 21 along the radial direction of the refractor 21, is 160°, enabling it to receive and collimate more light rays from the first beam 11. Optionally, the total internal reflection collimating lens can be a Fresnel lens, etc.

[0107] The beneficial effects of this application embodiment are: the total internal reflection collimating lens has strong light focusing ability. By using the total internal reflection collimating lens to collimate the first beam 11, the total internal reflection collimating lens can be set to a smaller diameter, reducing the space occupied by the collimating lens 20, and is more suitable for small lighting devices 1000 such as mobile phone flashlights.

[0108] In some embodiments, the parameters of the total internal reflection collimating lens are calculated using reverse tracing during design and evaluation. The following are the calculation and evaluation formulas:

[0109]

[0110] This formula is used to evaluate the size of the focused spot when tracing the beam backwards from the first spherical surface. Here, f is the focal length of the total internal reflection collimating lens; n is the refractive index of the total internal reflection collimating lens; r1 is the spherical radius of the refractive body 21; h is the thickness of the total internal reflection collimating lens; and x1 is the radius of the focal spot formed after the total internal reflection collimating lens converges the parallel beam. When x1 is moderate, the light-gathering efficiency of the refractive body 21 is highest. If x1 is too high, it may lead to poor manufacturability of the refractive body 21 or reduced light-gathering efficiency. If x1 is too small, it may lead to incomplete light gathering or reduced light-gathering efficiency. From this formula, it can be seen that when the refractive index n, height h, and focal length f of the material are known, the minimum value of r1 can be obtained when x1 is minimized. After numerical calculations with boundary conditions including the refractive index n, thickness h, and focal length f of the material, the optimal range is found to be between 2.0 mm ≤ r1 ≤ 23.8 mm. Optionally, a value of r1 of 8.3 mm is suitable, as it facilitates the fabrication of the refractive body 21 and results in high light-gathering efficiency.

[0111] The following boundary conditions must also be followed when designing a total internal reflection collimating lens:

[0112]

[0113] In the formula: n is the refractive index of the total internal reflection collimating lens; θ7 is the prism height angle, which is half of the light-receiving angle θ1 of the refractor 21; r refers to the focal spot radius formed by the total internal reflection collimating lens after converging the parallel beam when the incident beam parallel to the optical axis is incident on the incident surface 221 from the plane of the total internal reflection collimating lens; f is the focal length of the total internal reflection collimating lens; i is the ring number of the reflecting prism 22, which increases sequentially from the direction closer to the refractor 21 to the direction farther away from the refractor 21 (i is a positive integer); please refer to Figure 4 ΔR is the radius of the torus, which is half the difference between the outer diameter and the inner diameter of the incident surface 221 of the i-th reflecting prism 22; please refer to... Figure 5 x i Let x be the position of the incident light on the i-th ring. In the design, when an incident ray parallel to the optical axis travels from the plane of the total internal reflection collimating lens to the incident surface 221, the distance between the point where the incident ray exits from the incident surface 221 of the i-th reflecting prism 22 and the point on the incident surface 221 furthest from the plane of the total internal reflection collimating lens is x. i R is the aperture of the concentrator, which is the outer diameter of the i-th reflecting prism 22; K iLet θ1 be the edge height of the i-th reflecting prism 22, which is the dimension of the i-th reflecting prism 22 along its axial direction; β refers to the exit angle of a ray parallel to the axis of the total internal reflection collimating lens, which enters from the plane of the total internal reflection collimating lens and exits from the incident surface 221 of the i-th reflecting prism 22 (before exiting the reflecting prism 22). The edge height angle θ1 is related to the optical path configuration of the entire system. After adding boundary conditions using the finite-difference time-domain method, electromagnetic simulations were performed, and θ1 was calculated multiple times using multiple sets of parameters to finally determine the range of θ1.

[0114] In some embodiments, the side of the total internal reflection collimating lens furthest from the light source along the optical axis X is a frosted surface. The frosted surface can scatter light in different directions, thereby reducing the number of reflections inside the total internal reflection collimating lens, so that even if the number of reflecting prisms 22 is small, uniform distribution and collimation of the first beam 11 can be achieved.

[0115] In some embodiments, please refer to Figure 6 The total internal reflection collimating lens 20 includes five reflecting prisms 22. The five reflecting prisms 22 are designated as the first reflecting prism, the second reflecting prism, the third reflecting prism, the fourth reflecting prism, and the fifth reflecting prism from the direction closest to the optical axis to the direction furthest from the optical axis. The diameters of the first reflecting prism, the second reflecting prism, the third reflecting prism, the fourth reflecting prism, and the fifth reflecting prism gradually increase. The light-receiving angle θ2 of the first reflecting prism is 80°±4°, the light-receiving angle θ3 of the second reflecting prism is 100°±4°, the light-receiving angle θ4 of the third reflecting prism is 120°±4°, the light-receiving angle θ5 of the fourth reflecting prism is 140°±4°, and the light-receiving angle θ6 of the fifth reflecting prism is 160°±4°. It can receive more light rays from the first beam 11 and can ensure the collimation effect of the light rays.

[0116] In some embodiments, the collimating lens 20 is one of a superlens, an aspherical collimating lens, and a diffractive optical element (DOE collimating lens), each of which has a good collimating effect.

[0117] For example, please refer to Figures 7 to 9 The collimating lens 20 is a diffractive optical element, and its binary phase profile parameters are as follows: Figure 9 As shown, the collimating lens 20 is made of polycarbonate (POLYCARB) material.

[0118] The surface of the collimating lens 20 closest to the emitting light source 200 along the optical axis X is defined as the fifth surface 23, and the surface of the collimating lens 20 furthest from the emitting light source 200 along the optical axis X is defined as the sixth surface 24. The distance between the emitting light source 200 and the fifth surface 23 is 0.5 mm. The fifth surface 23 is a convex binary phase surface. The phase structure of the fifth surface 23 is used to converge light rays. The radius of curvature of the fifth surface 23 is 0.43638412 mm. The thickness of the collimating lens 20 is 0.1 mm. The optical radius of the fifth surface 23 is 0.3 mm. The normalized radius of the fifth surface 23 is 0.3. The phase of the second term of the fifth surface 23 is -423.6268344, the phase of the fourth term of the fifth surface 23 is 42.76540204, the phase of the sixth term of the fifth surface 23 is -5.504421491, and the phase of the eighth term of the fifth surface 23 is -0.213234342.

[0119] The sixth surface 24 is a planar binary phase surface. The distance between the sixth surface 24 and the projected light field 14 is 0.4 mm, and the optical radius of both the sixth surface 24 and the projected light field 14 is 0.3 mm. The projected light field 14 refers to the position of the imaging surfaces of the first lens group 30 and the second lens group 50 when a light beam from the side of the second lens group 50 away from the first lens group 30 is incident from the second lens group 50 onto the first lens group 30.

[0120] For example, please refer to Figures 10 to 12 Collimating lens 20 is an aspherical collimating lens, and its parameters are as follows: Figure 12 As shown, the collimating lens 20 is made of polycarbonate (POLYCARB) material.

[0121] Both the fifth surface 23 and the sixth surface 24 are even-order aspherical surfaces. The distance between the emitting light source 200 and the fifth surface 23 is 0.5 mm. The fifth surface 23 is convex, with a radius of curvature of 0.3756528 mm. The collimating lens 20 has a thickness of 0.1 mm, an optical radius of 0.3 mm, a normalized radius of 0.3, a quadratic aspherical term of -6.7145413, and a quartic aspherical term of 0.1456355.

[0122] The sixth surface 24 is convex, with a radius of curvature of 2.5432892 mm. The distance between the sixth surface 24 and the projected light field 14 is 0.4 mm, and the optical radius of the sixth surface 24 is 0.3 mm. The aspherical quadratic term of the sixth surface 24 is 3.1265672. The optical radius of the projected light field 14 is 0.3 mm.

[0123] For example, please refer to Figure 13 and Figure 14 Collimating lens 20 is a superlens, and the binary phase surface profile parameters of collimating lens 20 are as follows: Figure 14 As shown, the collimating lens 20 is made of polycarbonate (POLYCARB) material.

[0124] The distance between the emitting light source 200 and the fifth surface 23 is 0.5 mm. The fifth surface 23 is a convex binary phase surface. The phase structure of the fifth surface 23 is used to converge light rays. The radius of curvature of the fifth surface 23 is 1.9889453 mm. The thickness of the collimating lens 20 is 0.1 mm. The optical radius of the fifth surface 23 is 0.3 mm. The normalized radius of the fifth surface 23 is 0.3. The quadratic phase of the fifth surface 23 is -410.6543543. The quartic phase of the fifth surface 23 is 12.2154123.

[0125] The sixth surface 24 is a planar binary phase surface. The distance between the sixth surface 24 and the projected light field 14 is 0.4 mm, and the optical radius of the sixth surface 24 is 0.3 mm. The optical radius of the projected light field 14 is 0.3 mm.

[0126] In some embodiments, please refer to Figure 1 The first lens group 30 includes a plurality of first lens units 31, which are arranged in an array on a plane perpendicular to the optical axis. The second lens group 50 includes a plurality of second lens units 51 corresponding to the first lens units 31, which are arranged in an array on a plane perpendicular to the optical axis.

[0127] Each first lens unit 31 has a real focal point and is used to converge the first beam 11. Optionally, the first lens unit 31 can be an aspherical lens or a spherical lens, etc. Optionally, the first lens units 31 can be arranged in a polygonal array such as a rectangular array, a circular array, or a triangular array. Optionally, the diameter of the first lens unit 31 is 0.001mm-1mm. If the size of the first lens unit 31 is small, a smaller first lens group 30 can be arrayed, which can reduce the volume of the illumination device 1000.

[0128] Each first lens unit 31 has a corresponding second lens unit 51 coaxially. Optionally, each second lens unit 51 has a real focal point and is used to converge the second beam 12. Optionally, each second lens unit 51 has a virtual focal point and is used to diverge the second beam 12. Optionally, the second lens unit 51 can be an aspherical lens or a spherical lens, etc. The second lens units 51 can be arranged in a polygonal array such as a rectangular array, a circular array, or a triangular array. Optionally, the diameter of the second lens unit 51 is 0.001mm-1mm. A smaller size of the second lens unit 51 allows for the formation of a smaller second lens group 50, reducing the volume of the illumination device 1000.

[0129] Please refer to Figure 15 For ease of description, the side of the first lens unit 31 closest to the emitting light source 200 along the optical axis X is defined as the first surface 311; the side of the first lens unit 31 closest to the second lens unit 51 along the optical axis X is defined as the second surface 312; the side of the second lens unit 51 closest to the first lens unit 31 along the optical axis X is defined as the third surface 511; and the side of the second lens unit 51 facing away from the first lens unit 31 along the optical axis X is defined as the fourth surface 512. Please refer to... Figures 15 to 35 The first lens unit 31 and the second lens unit 51 can be combined in various ways.

[0130] For example, the first surface 311 is convex, the second surface 312 is convex, the third surface 511 is convex, and the fourth surface 512 is concave.

[0131] For example, please refer to Figure 25 The first surface 311 is convex, the second surface 312 is flat, the third surface 511 is convex, and the fourth surface 512 is concave.

[0132] For example, please refer to Figure 23 The first surface 311 is convex, the second surface 312 is concave, the third surface 511 is convex, and the fourth surface 512 is concave.

[0133] For example, please refer to Figure 15 The first surface 311 is convex, the second surface 312 is convex, the third surface 511 is concave, and the fourth surface 512 is concave.

[0134] For example, please refer to Figure 21 The first surface 311 is a plane, the second surface 312 is a convex surface, the third surface 511 is a convex surface, and the fourth surface 512 is a concave surface.

[0135] For example, please refer to Figure 19The first surface 311 is a plane, the second surface 312 is a convex surface, the third surface 511 is a plane, and the fourth surface 512 is a concave surface.

[0136] For example, please refer to Figure 17 The first surface 311 is a plane, the second surface 312 is a convex surface, the third surface 511 is a concave surface, and the fourth surface 512 is a concave surface.

[0137] For example, please refer to Figure 27 The first surface 311 is convex, the second surface 312 is concave, the third surface 511 is concave, and the fourth surface 512 is planar.

[0138] For example, please refer to Figure 29 The first surface 311 is convex, the second surface 312 is convex, the third surface 511 is convex, and the fourth surface 512 is flat.

[0139] For example, please refer to Figure 31 The first surface 311 is convex, the second surface 312 is flat, the third surface 511 is convex, and the fourth surface 512 is flat.

[0140] For example, please refer to Figure 33 The first surface 311 is concave, the second surface 312 is convex, the third surface 511 is convex, and the fourth surface 512 is planar.

[0141] For example, please refer to Figure 35 The first surface 311 is a plane, the second surface 312 is a convex surface, the third surface 511 is a convex surface, and the fourth surface 512 is a plane.

[0142] The beneficial effects of this application embodiment are as follows: the array arrangement of multiple first lens units 31 can focus the light in the first beam 11 separately, which can improve the light energy utilization rate; the multiple second lens units 51 are arranged corresponding to the first lens units 31, which can refract the multiple beams emitted by the multiple first lens units 31 separately, so that the light is uniformly mixed and uniform illumination is achieved.

[0143] In some embodiments, the first lens unit 31 is any one of a spherical lens, an aspherical lens, a Fresnel lens, a planar diffractive optical lens, and a planar superlens. That is, the first lens group 30 is any one of a spherical array, an aspherical array, a Fresnel lens array, a planar diffractive optical lens array, and a planar superlens array. This allows the first lens unit 31 to be set to a smaller size and has a stronger light-gathering ability, thereby enabling the first lens group 30 formed by the array of first lens units 31 to be set to a smaller size, making the first lens group 30 suitable for use in small lighting devices 1000 such as mobile phone flashlights. Optionally, multiple first lens groups 30 can be lenses of the same type, facilitating standardized manufacturing. Optionally, multiple first lens groups 30 can also be different types of lenses such as spherical lenses and aspherical lenses, capable of possessing the effects of multiple lenses.

[0144] In some embodiments, the second lens unit 51 is any one of a spherical lens, an aspherical lens, a Fresnel lens, a planar diffractive optical lens, and a planar superlens. That is, the second lens group 50 is any one of a spherical array, an aspherical array, a Fresnel lens array, a planar diffractive optical lens array, and a planar superlens array. This allows the second lens unit 51 to be set to a smaller size and has a stronger refractive power, thereby enabling the second lens group 50 formed by the array of second lens units 51 to be set to a smaller size, making the second lens group 50 suitable for use in small lighting devices 1000 such as mobile phone flashlights. Optionally, multiple second lens groups 50 can be lenses of the same type, facilitating standardized manufacturing. Optionally, multiple second lens groups 50 can also be different types of lenses such as spherical lenses and aspherical lenses, capable of possessing the effects of various lenses.

[0145] In some embodiments, the first lens unit 31 is any one of a spherical lens, an aspherical lens, a Fresnel lens, a planar diffractive optical lens, and a planar superlens; and the second lens unit 51 is any one of a spherical lens, an aspherical lens, a Fresnel lens, a planar diffractive optical lens, and a planar superlens. The first lens unit 31 and the second lens unit 51 can be set to a smaller size, thereby enabling the formation of a small-sized first lens group 30 and a small-sized second lens group 50, which can reduce the volume of the lighting device 1000 and make the lighting device 1000 more suitable for mobile phones.

[0146] Optionally, the first lens unit 31 and the second lens unit 51 are the same type of lens. The second beam 12 emitted from the first lens unit 31 is more evenly distributed on the second lens unit 51, and the light distribution in the final third beam 13 is more even.

[0147] In some embodiments, the first lens unit 31 and the second lens unit 51 are both aspherical lenses. The diameter of the aspherical lens is greater than or equal to 0.001 mm and less than or equal to 1 mm. The smaller diameter of the first lens unit 31 and the second lens unit 51 can reduce the volume of the lighting device 1000, making the lighting device 1000 more suitable for mobile phones.

[0148] In some embodiments, both the first lens unit 31 and the second lens unit 51 are planar superlenses, each containing a polarization-independent cylindrical nanopillar. Optionally, the period of the nanopillar is greater than or equal to 200 nm and less than or equal to 500 nm, exhibiting strong light refraction and a small size, thus reducing the volume of the illumination device 1000. Optionally, the height of the nanopillar is determined by the material of the planar superlens, and the height of the nanopillar is less than or equal to 1 μm, allowing it to be fabricated using various materials.

[0149] The beneficial effects of this application embodiment are that: the planar superlens is relatively thin and light, and the first lens unit 31 and the second lens unit 51 are both planar superlenses, so the first lens group 30 and the second lens can be set to a smaller size, making the lighting device 1000 smaller in size.

[0150] In some embodiments, both the first lens unit 31 and the second lens unit 51 are Fresnel lenses. Optionally, the serration period of the Fresnel lens is greater than or equal to 5 μm and less than or equal to 0.2 μm. The Fresnel lens has a small size, which can reduce the volume of the illumination device 1000.

[0151] Optionally, the fourth surface 512 of the second lens group 50 is a concave polynomial Fresnel surface, which can maximize the beam angle. The third surface 511 is a concave spherical Fresnel surface, which is not sensitive to positional tolerances during zooming and provides a smoother beam pattern. Optionally, the second surface 312 of the second zoom group is a spherical convex Fresnel surface, which can focus light onto a position adjacent to the second surface 312. The first surface 311 is a convex polynomial Fresnel surface, which can effectively collect light collimated from the collimating lens 20.

[0152] The beneficial effects of this application embodiment are: Fresnel lenses are relatively thin and light and can refract light over a wide range. Since the first lens unit 31 and the second lens unit 51 are both Fresnel lenses, the first lens group 30 and the second lens can be set to a smaller size, making the illumination device 1000 smaller in size. Moreover, the third beam 13 emitted by the second lens group 50 can have a larger beam angle and a larger illumination range.

[0153] In some embodiments, please refer to Figure 37Multiple first lens units 31 are arranged in a rectangular array; multiple second lens units 51 are arranged in a rectangular array, which is convenient for manufacturing.

[0154] Optionally, a plurality of first lens units 31 are arranged in an 8×8 rectangular array along the vertical optical axis. Optionally, a plurality of second lens units 51 are arranged in an 8×8 rectangular array.

[0155] In some embodiments, a plurality of first lens units 31 are arranged in a hexagonal array; a plurality of second lens units 51 are arranged in a hexagonal array. The hexagonal lens array can provide more uniform light coverage. Due to the close arrangement of the hexagons, the overlap and gaps of light can be minimized, making the distribution of light in the target area more uniform. Moreover, the close arrangement of the hexagonal array can capture and utilize light more effectively, reducing the loss of light energy.

[0156] In some embodiments, please refer to Figure 15 and Figure 16 The first lens group 30 has two surfaces along the optical axis X used to converge the light beam, meaning both surfaces along the optical axis X have a positive focal length. For example, when the first lens group 30 or the first lens unit 31 is an aspherical lens, both surfaces along the optical axis X are convex. For example, when the first lens group 30 or the first lens unit 31 is a planar superlens, both surfaces along the optical axis X of the planar superlens have a positive focal length and are binary phase. For example, when the first lens group 30 or the first lens unit 31 is a Fresnel lens, the Fresnel sawtooth on both surfaces along the optical axis X has a positive focal length, and both Fresnel sawtooth are used to converge the light beam.

[0157] The beneficial effects of this application embodiment are that: both sides of the first lens group 30 along the optical axis direction X are used to converge the light beam, which can enhance the light-gathering ability of the first lens group 30 and can stably direct the second light beam 12 to the second lens group 50.

[0158] In some embodiments, please refer to Figure 15 and Figure 16 The second lens group 50 has two surfaces along the optical axis X used for diverging light beams, meaning both surfaces along the optical axis X have negative focal lengths. For example, when the second lens group 50 or the second lens unit 51 is an aspherical lens, both surfaces along the optical axis X are concave. For example, when the second lens group 50 or the second lens unit 51 is a planar superlens, both surfaces along the optical axis X have negative focal lengths and binary phase. For example, when the second lens group 50 or the second lens unit 51 is a Fresnel lens, both surfaces along the optical axis X are provided with Fresnel serrations, the focal lengths of the Fresnel serrations on both surfaces are negative, and the Fresnel serrations are used for diverging light beams.

[0159] The beneficial effects of this application embodiment are that: both sides of the second lens group 50 along the optical axis direction X are used to diverge the light beam, which can enhance the ability of the second lens group 50 to diverge the light beam, and enable the third beam 13 to have a larger beam angle, thereby improving the illumination range of the third beam 13 at close range.

[0160] In some embodiments, please refer to Figure 15 and Figure 16 The first lens group 30 has two surfaces along the optical axis X used to converge the light beam, and the second lens group 50 has two surfaces along the optical axis X used to diverge the light beam.

[0161] In some embodiments, please refer to Figures 15 to 26 The side of the second lens group 50 facing away from the first lens group 30 along the optical axis X is used to diffuse the second beam 12, which can enhance the ability of the second lens group 50 to diffuse light, and enable the third beam 13 to have a larger beam angle, thereby improving the illumination range of the third beam 13 at close range.

[0162] For example, when the second lens group 50 or the second lens unit 51 is an aspherical lens, the side of the aspherical lens facing away from the first lens group 30 along the optical axis X is concave. For example, when the second lens group 50 or the second lens unit 51 is a planar superlens, the side of the planar superlens facing away from the first lens group 30 along the optical axis X has a negative focal length and a binary phase. For example, when the second lens group 50 or the second lens unit 51 is a Fresnel lens, the Fresnel sawtooth on the side of the Fresnel lens facing away from the first lens group 30 along the optical axis X has a negative focal length, and this Fresnel sawtooth is used to diverge light rays.

[0163] In some embodiments, please refer to Figure 1 In the lens assembly 100 where the distance between the second lens group 50 and the first lens group 30 along the optical axis X is the smallest, the focal length of the first lens group 30 is greater than the distance between the optical center of the first lens group 30 and the second lens group 50; in the lens assembly 100 where the distance between the second lens group 50 and the first lens group 30 along the optical axis X is the largest, the focal length of the first lens group 30 is less than the distance between the optical center of the first lens group 30 and the second lens group 50.

[0164] The focal length of the first lens group 30 is greater than the distance between the optical center of the first lens group 30 and the second lens group 50. This means the focal point of the first lens group 30 is located within the second lens group 50, or the focal point of the first lens group 30 is located on the side of the second lens group 50 opposite to the first lens group 30 along the optical axis X. When the second beam 12 is projected onto the second lens group 50, the beam diameter is smaller and the beam convergence is higher. Optionally, the second lens group 50 is composed of thick lenses.

[0165] The focal length of the first lens group 30 is less than the distance between the optical center of the first lens group 30 and the second lens group 50, meaning the focal point of the first lens group 30 is located between the first lens group 30 and the second lens group 50. The distance between the optical center of the first lens group 30 and the second lens group 50 refers to the distance between the optical center of the first lens group 30 and the side of the second lens group 50 closest to the first lens group 30 along the optical axis X. When the second beam 12 is projected onto the second lens group 50, the beam diameter is larger and the beam convergence is lower. Optionally, in each lens assembly 100, each first lens group 30 is located on the same plane perpendicular to the optical axis X, and the difference between the maximum and minimum distances between the second lens group 50 and the first lens group 30 along the optical axis X is 0.5 mm. The overall size of each lens assembly 100 in the optical axis X is smaller, which can reduce the volume of the illumination device 1000.

[0166] Please refer to Figures 15 to 22 , Figures 25 to 36 Different second lens units 51 in the second lens group 50 have different refraction effects on the second beam 12. Figure 16 , Figure 18 , Figure 20 , Figure 22 , Figure 26 Figures (a), (b), (c), and (d) are schematic diagrams of the first lens unit 31 and the second lens unit 51 in the four lens assemblies 100, respectively. From figure (a) to figure (d), the distance between the second lens unit 51 and the first lens unit 31 gradually changes from maximum to minimum. Figure 28 , Figure 30 , Figure 32 , Figure 34 and Figure 36 In the figure, (a), (b) and (c) are schematic diagrams of the first lens unit 31 and the second lens unit 51 in the three lens assemblies 100, respectively. From (a) to (c), the distance between the second lens unit 51 and the first lens unit 31 gradually changes from the maximum to the minimum.

[0167] For example, please refer to Figure 21 , Figure 22 , Figure 25 and Figure 26The third surface 511 is convex, and the fourth surface 512 is concave. In the lens assembly 100 with the largest distance between the second lens group 50 and the first lens group 30, the second beam 12 converges at a point between the second surface 312 and the third surface 511 and then diverges. When the second beam 12 is projected onto the third surface 511, it is in a divergent state. The third surface 511 converges the second beam 12 and directs it toward the fourth surface 512. The fourth surface 512 diverges the second beam 12 and emits a third beam 13, which has the smallest beam angle. In the four lens assemblies 100, as the distance between the second and third lens groups increases, the second beam 12 converges at a point between the second surface 312 and the third surface 511 and then emits a third beam 13. As the distance between the second lens group 50 and the first lens group 30 decreases, the beam angle of the third beam 13 increases. In the lens assembly 100 where the distance between the second lens group 50 and the first lens group 30 is the smallest, the second beam 12 is in a converging state when it is projected onto the third surface 511. The third surface 511 converges the second beam 12, causing the second beam 12 to converge into a single point within the second lens group 50 and then diverge. After diverging, the second beam 12 is directed toward the fourth surface 512, which further diverges the second beam 12 and emits the third beam 13. The beam angle of the third beam 13 is the largest.

[0168] For example, please refer to Figure 19 and Figure 20 The third surface 511 is planar, and the fourth surface 512 is concave. In the lens assembly 100 with the largest distance between the second lens group 50 and the first lens group 30, the second beam 12 converges at a point between the second surface 312 and the third surface 511 and then diverges. The second beam 12 is in a divergent state when it is projected onto the third surface 511. The fourth surface 512 diverges the second beam 12 and emits a third beam 13, which has the largest beam angle. In the four lens assemblies 100, as the second lens group 511... As the distance between 0 and the first lens group 30 decreases, the beam angle of the third beam 13 gradually decreases. In the lens assembly 100 where the distance between the second lens group 50 and the first lens group 30 is the smallest, the second beam 12 is in a converging state when it is projected onto the third surface 511. The fourth surface 512 diverges the second beam 12 and emits the third beam 13, so that the third beam 13 converges into a diverging beam on the side of the second lens group 50 away from the first lens group 30 along the optical axis X. The beam angle of the third beam 13 is the smallest.

[0169] For example, please refer to Figures 15 to 18The third surface 511 is concave, and the fourth surface 512 is concave. In the lens assembly 100 with the largest distance between the second lens group 50 and the first lens group 30, the second beam 12 converges at a point between the second surface 312 and the third surface 511 and then diverges. When the second beam 12 is projected onto the third surface 511, it is in a divergent state. The third surface 511 diverges the second beam 12 and directs it toward the fourth surface 512. The fourth surface 512 diverges the second beam 12 and emits a third beam 13, which has the largest beam angle. In the four lens assemblies 100, as the second lens group 50 and the first lens group 30 are at their largest distances, the second beam 12 converges at a point between the second surface 312 and the third surface 511 and then diverges, producing a third beam 13. As the distance between lens groups 30 decreases, the beam angle of the third beam 13 gradually decreases. In the lens assembly 100 where the distance between the second lens group 50 and the first lens group 30 is the smallest, the second beam 12 is in a converging state when it is projected onto the third surface 511. The third surface 511 diverges the second beam 12, and after the second beam 12 diverges, it is directed toward the fourth surface 512. The fourth surface 512 further diverges the second beam 12 and emits the third beam 13. The third beam 13 converges into a diverging beam on the side of the second lens group 50 away from the first lens group 30 along the optical axis X. The beam angle of the third beam 13 is the smallest.

[0170] For example, please refer to Figure 27 and Figure 28 The third surface 511 is concave, and the fourth surface 512 is flat. In the lens assembly 100 with the largest distance between the second lens group 50 and the first lens group 30, the second beam 12 converges at a point between the second surface 312 and the third surface 511 and then diverges. When the second beam 12 is projected onto the third surface 511, it is in a divergent state. The third surface 511 diverges the second beam 12 and directs it toward the fourth surface 512. After passing through the fourth surface 512, the second beam 12 continues to diverge and forms the third beam 13, which has the largest beam angle. In the three lens assemblies 100, as the distance between the second lens group 50 and the first lens group 30 increases, the distance between the second lens group 50 and the first lens group 30 increases. As the distance between lens groups 30 decreases, the beam angle of the third beam 13 gradually decreases. In the lens assembly 100 where the distance between the second lens group 50 and the first lens group 30 is the smallest, the second beam 12 is in a converging state when it is projected onto the third surface 511. The third surface 511 diverges the second beam 12, which continues to converge and is directed toward the fourth surface 512. After passing the fourth surface 512, the second beam 12 continues to converge and forms the third beam 13. The third beam 13 converges to a point on the side of the fourth surface 512 away from the third surface 511 and then diverges, forming a diverging beam. The beam angle of the third beam 13 is the smallest.

[0171] Please refer to Figures 29 to 36The third surface 511 is convex, and the fourth surface 512 is flat. In the lens assembly 100 with the largest distance between the second lens group 50 and the first lens group 30, the second beam 12 converges at a point between the second surface 312 and the third surface 511 and then diverges. The second beam 12 is divergent when projected onto the third surface 511. The third surface 511 converges the second beam 12 and directs it towards the fourth surface 512. After passing the fourth surface 512, the second beam 12 continues to diverge and forms the third beam 13, which has the smallest beam angle. In the three lens assemblies... In the lens assembly 100, as the distance between the second lens group 50 and the first lens group 30 decreases, the beam angle of the third beam 13 gradually increases. In the lens assembly 100 where the distance between the second lens group 50 and the first lens group 30 is the smallest, the second beam 12 is in a converging state when it is projected onto the third surface 511. The third surface 511 converges the second beam 12. The second beam 12 converges into a point within the second lens group 50 and then diverges and is directed toward the fourth surface 512. After passing through the fourth surface 512, the second beam 12 continues to diverge and forms the third beam 13. The beam angle of the third beam 13 is the smallest.

[0172] The beneficial effects of this application embodiment are as follows: By limiting the distance between the second lens group 50 and the first lens group to the above-mentioned range, when the third surface 511 is convex, in the lens assembly 100 with the largest distance between the second lens group 50 and the first lens group 30, the second beam 12 can form a diverging beam when projected onto the second lens group 50. After the second beam 12 is converged by the third surface 511, the beam angle becomes smaller. After the second beam 12 is diverged by the fourth surface 512, it can form a third beam 13 with a smaller beam angle. The distance between the second lens group 50 and the first lens group 30 is limited to the above-mentioned range. In the lens assembly 100 with a small distance between them, the second beam 12 can form a converging beam when projected onto the second lens group 50, and the second beam 12 can converge into a point in the second lens group 50 after passing through the third surface 511 and then diverge again. After the second beam 12 is further diverged by the fourth surface 512, it can form a third beam 13 with a larger beam angle. The beam angle of the third beam 13 emitted by different lens assemblies 100 varies over a large range. When the size of the lighting device 1000 is small, the beam angle of the third beam 13 can vary in the range of 15°-140°.

[0173] When the third surface 511 is flat or concave, in the lens assembly 100 with the largest distance between the second lens group 50 and the first lens group 30, the second beam 12 can form a diverging beam when projected onto the second lens group 50. The divergence of the second beam 12 after passing through the third surface 511 is still relatively large. After the second beam 12 is further diverged by the fourth surface 512, it can form a third beam 13 with a larger beam angle. In the lens assembly 100 with a smaller distance between the second lens group 50 and the first lens group 30, the second beam 12 can form a converging beam when projected onto the second lens group 50. After passing through the third surface 511, the second beam 12 can converge in the second lens group 50, reducing the divergence of the second beam 12. After passing through the fourth surface 512, the second beam 12 can form a third beam 13 with a smaller beam angle. The beam angle of the third beam 13 emitted by different lens assemblies 100 varies over a large range. When the size of the lighting device 1000 is small, the beam angle of the third beam 13 can vary within the range of 15°-140°.

[0174] In some embodiments, please refer to Figure 1 , Figure 23 and Figure 24 In the optical axis direction X, in each lens assembly 100, the focal length of the first lens group 30 is greater than the distance between the optical center of the first lens group 30 and the second lens group 50.

[0175] For example, please refer to Figure 23 and Figure 24 The third surface 511 is convex, and the fourth surface 512 is concave; the lens assembly 100 has four components. Figure 24 In the figures (a), (b), (c), and (d), respectively, the first lens unit 31 and the second lens unit 51 in the four lens assemblies 100 are schematic diagrams. From figure (a) to figure (d), the distance between the second lens unit 51 and the first lens unit 31 gradually changes from the maximum to the minimum. In the lens assembly 100 where the distance between the second lens group 50 and the first lens group 30 is the largest, the second beam 12 gradually converges between the second surface 312 and the third surface 511, and the second beam 12 is in a converging state when it is projected onto the third surface 511. The second beam 12 is converged into a point within the second lens group 50 and then diverges. After diverging, the second beam 12 is directed toward the fourth surface 512, which further diverges the second beam 12 and emits a third beam 13. The beam angle of the third beam 13 is the smallest. Among the four lens groups 100, as the distance between the second lens group 50 and the first lens group 30 decreases, the beam angle of the third beam 13 gradually increases. In the lens assembly 100 where the distance between the second lens group 50 and the first lens group 30 is the smallest, the beam angle of the third beam 13 becomes the largest.

[0176] In some embodiments, please refer to Figure 1 and Figure 15 The distance B between the first lens group 30 and the second lens group 50 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. The lens assembly 100 has a smaller size in the optical axis direction X, which reduces the volume of the illumination device 1000. The distance B between the first lens group 30 and the second lens group 50 refers to the distance between the side of the first lens group 30 closest to the second lens group 50 in the optical axis direction X and the side of the second lens group 50 closest to the first lens group 30 in the optical axis direction X. For example, in the lens assembly 100 with the smallest distance between the second lens group 50 and the first lens group 30 in the optical axis direction X, the distance between the first lens group 30 and the second lens group 50 is greater than or equal to 0.1 mm. In the lens assembly 100 with the largest distance between the second lens group 50 and the first lens group 30 in the optical axis direction X, the distance between the first lens group 30 and the second lens group 50 is less than or equal to 0.5 mm.

[0177] In some embodiments, please refer to Figure 1 The lens assembly 100 also includes a light-blocking plate 40 disposed between the first lens group 30 and the second lens group 50. The light-blocking plate 40 is provided with a plurality of light-transmitting holes 41, which correspond to a plurality of first lens units 31 and a plurality of second lens units 51 respectively.

[0178] A light-blocking plate 40 is perpendicular to the optical axis X. The light-blocking plate 40 comprises an opaque material and is capable of blocking the second light beam 12. A light-transmitting hole 41 extends through the light-blocking plate 40 along the optical axis X, allowing the second light beam 12 to pass through and reach the second lens group 50. Optionally, the light-blocking plate 40 can be a metal light-blocking sheet with high strength. Optionally, the light-blocking plate 40 can be provided with light-blocking structures such as colored light-blocking ink, a light-blocking coating layer, or a resin light-blocking film.

[0179] Multiple light-transmitting holes 41 correspond to multiple first lens units 31, and multiple light-transmitting holes 41 also correspond to multiple second lens units 51. That is, for each first lens unit 31, there is a light-transmitting hole 41 and a second lens unit 51 coaxial with that first lens unit 31. Optionally, the aperture of the light-transmitting hole 41 is smaller than the diameter of the first lens unit 31. Optionally, the light-transmitting hole 41 can be a circular hole or an elliptical hole. Optionally, the light-transmitting hole 41 can also be a polygonal hole of various shapes such as quadrilateral, pentagon, hexagon, or octagon.

[0180] The beneficial effects of this application embodiment are as follows: the light-transmitting hole 41 enables the second beam 12 to be projected onto the second lens unit 51, the light-blocking plate 40 can block excess stray light in the second beam 12 from entering the second lens unit 51, and can block stray light that is particularly bright at certain angles due to higher-order diffraction, making the edge of the emitted light spot sharp, and making the shape of the light spot consistent with the shape of the light-transmitting hole 41 of the light-blocking layer.

[0181] In some embodiments, the light-blocking plate 40 is made of black material, and the thickness of the light-blocking plate 40 along the optical axis direction X is less than or equal to 0.2 mm, which makes it easy to install in a small space and can reduce the size of the lighting device 1000.

[0182] Optionally, the light-blocking plate 40 can be made of black plastic, which is lightweight. Alternatively, the light-blocking plate 40 can also be made of a black metal material, which is strong.

[0183] Optionally, the thickness of the light-blocking plate 40 along the optical axis X can be 0.2 mm, resulting in higher strength. Alternatively, the thickness of the light-blocking plate 40 along the optical axis X can also be 0.1 mm, resulting in lower weight and smaller space occupation.

[0184] The beneficial effects of this application embodiment are as follows: the light-blocking plate 40 is made of black material, which has a stronger ability to block light and improves the effect of filtering stray light; the thickness of the light-blocking plate 40 is less than or equal to 0.2mm, so the light-blocking plate 40 occupies less space, and the lighting device 1000 is more suitable for smaller installation spaces.

[0185] In some embodiments, the light-blocking plate 40 is made of black material, and the aperture of the light-transmitting hole 41 is less than or equal to 0.3 mm, which can be adapted to the first lens unit 31 with a smaller diameter.

[0186] The aperture of the light-transmitting hole 41 is related to the diameter of the first lens unit 31 and the second lens unit 51. Optionally, the aperture of the light-transmitting hole 41 can be 0.3 mm. Optionally, the aperture of the light-transmitting hole 41 can also be 0.1 mm.

[0187] The beneficial effect of this application embodiment is that: the aperture of the light-transmitting hole 41 is less than or equal to 0.3mm, so the light-blocking plate 40 occupies less space, and the lighting device 1000 is more suitable for smaller installation spaces.

[0188] In some embodiments, multiple light-blocking plates 40 in the multiple lens assemblies 100 are disposed on the same plane perpendicular to the optical axis direction X.

[0189] Multiple light-blocking plates 40 in each lens assembly 100 are positioned at the same location along the optical axis X, reducing the overall size of the multiple lens assemblies 100 along the optical axis X. Optionally, the multiple light-blocking plates 40 are an integral structure, allowing multiple light-blocking plates 40 to be processed at once, thereby improving production efficiency. Optionally, the distance between the light-blocking plates 40 and the first lens group 30 in the multiple lens assemblies 100 is equal, and the light-blocking plates 40 have a good filtering effect on the second light beam 12 emitted from the multiple first lens groups 30.

[0190] In some embodiments, a plurality of first lens groups 30 in a plurality of lens assemblies 100 are distributed on the same plane perpendicular to the optical axis direction X.

[0191] In each lens assembly 100, multiple first lens groups 30 are located at the same position along the optical axis X, reducing the overall size of the multiple lens assemblies 100 along the optical axis X. Optionally, the multiple first lens groups 30 are an integral structure, allowing multiple first lens groups 30 to be processed at once, thereby improving production efficiency.

[0192] In some embodiments, a plurality of collimating lenses 20 in a plurality of lens assemblies 100 are distributed on the same plane perpendicular to the optical axis direction X.

[0193] The multiple collimating lenses 20 in each lens assembly 100 are located at the same position in the optical axis direction X, reducing the overall size of the multiple lens assemblies 100 in the optical axis direction X. Optionally, the multiple collimating lenses 20 are integrated into a single structure, allowing multiple collimating lenses 20 to be processed at once, thereby improving production efficiency.

[0194] In some embodiments, multiple emitting light sources 200 are arranged in a rectangular or hexagonal array on a plane perpendicular to the optical axis X, and the orthographic projections of multiple lens assemblies 100 are arranged in a rectangular or hexagonal array on a projection plane perpendicular to the optical axis X.

[0195] Each emitting light source 200 is positioned at the same location along the optical axis X, reducing the overall size of the multiple lens assemblies 100 along the optical axis X. Along the optical axis X, each lens assembly 100 faces one emitting light source 200. When the multiple emitting light sources 200 are arranged in a rectangular array on a plane perpendicular to the optical axis X, the orthographic projection of the multiple lens assemblies 100 onto the projection plane perpendicular to the optical axis X is a rectangular array; when the multiple emitting light sources 200 are arranged in a hexagonal array on a plane perpendicular to the optical axis X, the orthographic projection of the multiple lens assemblies 100 onto the projection plane perpendicular to the optical axis X is a hexagonal array.

[0196] On a projection plane perpendicular to the optical axis direction X, the orthographic projections of multiple lens assemblies 100 form a rectangular array, that is, the orthographic projections of multiple first lens groups 30 form a rectangular array, and the orthographic projections of multiple second lens groups 50 form a rectangular array; when the lens assembly 100 includes a collimating lens 20, the orthographic projections of multiple collimating lenses 20 form a rectangular array; when the lens assembly 100 includes a light-blocking plate 40, the orthographic projections of multiple light-blocking plates 40 form a rectangular array.

[0197] On a projection plane perpendicular to the optical axis direction X, the orthographic projections of multiple lens assemblies 100 form a hexagonal array, that is, the orthographic projections of multiple first lens groups 30 form a hexagonal array, and the orthographic projections of multiple second lens groups 50 form a hexagonal array; when the lens assembly 100 includes a collimating lens 20, the orthographic projections of multiple collimating lenses 20 form a hexagonal array; when the lens assembly 100 includes a light-blocking plate 40, the orthographic projections of multiple light-blocking plates 40 form a hexagonal array.

[0198] The beneficial effects of this application embodiment are as follows: the orthographic projection of the emitting light source 200 and the lens assembly 100 on the projection plane perpendicular to the optical axis direction X is a rectangular array or a hexagonal array. The emitting light source 200 and the lens assembly 100 are arranged relatively closely, which can reduce the overlap and gaps of light in adjacent emitting light sources 200 and lens assemblies 100, reduce the loss of light energy, and make the distribution of light in the target area more uniform.

[0199] In some embodiments, both the first lens unit 31 and the second lens unit 51 are aspherical lenses, and the side of the total internal reflection collimating lens closest to the first surface 311 (the light-emitting surface) is a frosted surface. Please refer to... Figure 38 When designing the optical path for adjusting the beam angle of the third beam 13 of a first lens unit 31 and a second lens unit 51, and for adjusting the angle of the light field, if the projected light field 14 is taken as a fixed reference surface, then the first lens unit 31 and the second lens unit 51 need to be moved simultaneously to adjust the beam angle of the third beam 13. The projected light field 14 refers to the imaging surface position of the first lens group 30 and the second lens unit 51 when the beam on the side of the second lens unit 51 away from the first lens unit 31 is directed from the second lens group 50 to the first lens group 30. The beam on the side of the second lens unit 51 away from the first lens unit 31 is defined as the designed projected beam.

[0200] Optionally, with the second lens group 50 as the reference surface and its position fixed, the projected light field 14, where the beam angle of the designed projected beam is equal to the maximum beam angle of the third beam 13, is positioned at the output surface of the total internal reflection collimating lens. The position of the first lens group 30 is changed, reducing the distance between the first lens group 30 and the second lens group 50, causing the projected light field 14 to move and the beam angle of the designed projected beam to decrease. In actual use, the light at the position of the projected light field 14 is output from the total internal reflection collimating lens. The light, homogenized by the frosted surface and uniformly distributed with a certain diffusion angle, remains nearly parallel before and after the position of the projected light field 14 changes among different lens assemblies 100, and the uniformity of the light spot is almost unaffected. The projection light spot of the third beam 13 is formed by superimposing the projection light spots of multiple aspherical lens light distribution units, resulting in a very uniform projection light spot. The beam angle range of the third beam 13 emitted by each lens assembly 100 is 15°-140°, allowing the third beam 13 to illuminate a larger area.

[0201] For example, please refer to the parameters of the first lens unit 31 and the corresponding second lens unit 51. Figure 39 The first lens unit 31 and the second lens unit 51 are both made of polycarbonate (POLYCARB) material. The first surface 311, the second surface 312, the third surface 511 and the fourth surface 512 are all even-order aspherical surfaces. The distance between the object surface and the first surface 311 is 1 mm. The projected light field 14 is the image surface corresponding to the object surface.

[0202] The fourth surface 512 is convex, and the radius of curvature of the fourth surface 512 is 0.436386412 mm. The thickness of the second lens unit 51 is 0.28 mm. The aspherical quadratic term of the fourth surface 512 is 1.726438625, and the optical radius of the fourth surface 512 is 0.37 mm.

[0203] The third surface 511 is concave, with a radius of curvature of 0.359186859 mm. The distance between the third surface 511 and the light-blocking plate 40 is 0.326221686 mm. The aspherical quadratic term of the third surface 511 is 2.242217102, and the optical radius of the third surface 511 is 0.283 mm.

[0204] The distance between the light-blocking plate 40 and the second surface 312 is 0.093681681 mm, and the optical radius of the light-blocking plate 40 is 0.1 mm.

[0205] The second surface 312 is convex, with a radius of curvature of 0.386020963 mm. The thickness of the first lens unit 31 is 0.466868767 mm. The aspherical quadratic term of the second surface 312 is 2.635036113, and the optical radius of the second surface 312 is 0.34 mm.

[0206] The first surface 311 is convex, with a radius of curvature of 0.546648658 mm. The distance between the first surface 311 and the projected light field 14 is 0.283274127 mm. The aspherical quadratic term of the first surface 311 is -1.94581475, and the optical radius of the first surface 311 is 0.37 mm. The optical radius of the projected light field 14 is 0.32708532 mm.

[0207] In some embodiments, the first lens unit 31 and the second lens unit 51 are both Fresnel lenses. The collimating lens 20 collimates the first beam 11 emitted by the emitting light source 200. The collimated first beam 11 is converged by the first lens group 30 to form a second beam 12. The second beam 12 converges to the gap between the first lens group 30 and the second lens group 50 and then diverges. The second beam 12 is then expanded by the second lens group 50 to form a third beam 13.

[0208] When designing the optical path for adjusting the beam angle and variable-angle light field of the third beam 13 of a first lens unit 31 and a second lens unit 51, the second lens group 50 is kept in a fixed position as a reference surface. The projected light field 14, where the beam angle of the designed projection beam is equal to the maximum beam angle of the third beam 13, is positioned at the exit surface of the total internal reflection collimating lens. By changing the position of the first lens group 30, the distance between the first lens group 30 and the second lens group 50 is reduced, causing the projected light field 14 to move closer to the second lens group 50, thus reducing the beam angle of the designed projection beam. In actual use, the collimating lens 20 emits a parallel beam, and the projected light field 14 remains parallel before and after the position change. In different lens assemblies 100, although the positions of the first lens group 30 and the projected light field 14 are different, the uniformity of the light spot is almost unaffected. By superimposing the projected light spots of multiple Fresnel lens light distribution units to form the projected light spot of the third beam 13, a very uniform projected light spot can be obtained.

[0209] For example, please refer to the parameters of the first lens unit 31 and the corresponding second lens unit 51. Figure 40Both the first lens unit 31 and the second lens unit 51 are made of polycarbonate (POLYCARB) material, and the distance between the object plane and the fourth surface 512 is 0.3 mm. The fourth surface 512 is a concave polynomial Fresnel surface used to diverge light. The radius of curvature of the fourth surface 512 is 0.603240197 mm. The thickness of the second lens unit 51 is 0.3 mm. The aspherical fourth term of the fourth surface 512 is 3.166431557, the aspherical sixth term is 11.07134051, the aspherical eighth term is -260.632956, and the optical radius of the fourth surface 512 is 0.28 mm.

[0210] The third surface 511 is a concave spherical Fresnel surface used to diffuse light. The radius of curvature of the third surface 511 is 0.60379257 mm. The distance between the third surface 511 and the light-blocking plate 40 is 0.191663418 mm. The optical radius of the third surface 511 is 0.28 mm.

[0211] The distance between the light-blocking plate 40 and the second surface 312 is 0.228315273 mm, and the optical radius of the light-blocking plate 40 is 0.090015 mm. The second surface 312 is a convex Fresnel surface of a spherical surface used to converge light rays, and the radius of curvature of the second surface 312 is 0.435222926 mm. The thickness of the first lens unit 31 is 0.3 mm, and the optical radius is 0.28 mm.

[0212] The first surface 311 is a convex polynomial Fresnel surface used to converge light rays. The radius of curvature of the first surface 311 is 0.298755982 mm. The distance between the first surface 311 and the projected light field 14 is 0.430035359 mm. The aspherical fourth-order term of the first surface 311 is 13.74320371, the aspherical sixth-order term is -154.5427719, and the aspherical eighth-order term is 2780.965794. The optical radius of the first surface 311 is 0.28 mm. The optical radius of the projected light field 14 is 0.252632 mm.

[0213] Please refer to the simulation diagram of the optical path at the maximum beam angle of the third beam 13. Figure 41 The light in the third beam 13 is uniformly distributed. For the shape of the light spot and illuminance (Lux) of the third beam 13 at a distance of one meter, please refer to [reference needed]. Figure 42 , Figure 42 Figure (a) shows the position of the light spot in the horizontal (X-axis) and vertical (Y-axis) directions. Figure 42 Figure (b) shows the illuminance of the light spot at different longitudinal positions in Figure (a). Figure 42 Figure (c) shows the illuminance of the light spot at different horizontal positions in Figure (a); Figure 42 Figure (d) shows the illuminance corresponding to the color in Figure (a). For the simulation diagram of the optical path when the beam angle of the third beam 13 is at its minimum, please refer to [the original text]. Figure 43 The light in the third beam 13 is uniformly distributed. For the shape of the light spot and illuminance (Lux) of the third beam 13 at a distance of one meter, please refer to [reference needed]. Figure 44 , Figure 44 Figure (a) shows the position of the light spot in the horizontal (X-axis) and vertical (Y-axis) directions. Figure 44 Figure (b) shows the illuminance of the light spot at different longitudinal positions in Figure (a). Figure 44 Figure (c) shows the illuminance of the light spot at different horizontal positions in Figure (a); Figure 44 Figure (d) shows the illuminance corresponding to the colors in Figure (a).

[0214] In some embodiments, both the first lens unit 31 and the second lens unit 51 are surface superlenses. When designing the optical path for adjusting the beam angle and variable angle light field of the third beam 13 of a first lens unit 31 and a second lens unit 51, the position of the second lens group 50 as the reference surface is kept fixed, and the projected light field 14, when the beam angle of the designed projection beam is equal to the maximum angle of the third beam 13, is set at the position of the light-emitting surface of the total internal reflection collimating lens; by changing the position of the first lens group 30 to reduce the distance between the first lens group 30 and the second lens group 50, the projected light field 14 moves towards the second lens group 50, thereby reducing the beam angle of the designed projection beam. In practical use, the collimating lens 20 emits a parallel beam of light, which remains parallel even before the position of the projected light field 14 changes. In different lens assemblies 100, although the first lens group 30 and the projected light field 14 are at different positions, the uniformity of the light spot is almost unaffected. By superimposing the projected light spots of multiple Fresnel lens light distribution units to form the projected light spot of the third beam 13, a very uniform projected light spot can be obtained. The beam angle range of the third beam 13 emitted by each lens assembly 100 is 15°-140°, allowing the third beam 13 to illuminate a larger area.

[0215] Please refer to the binary phase profile parameters of the first lens unit 31 and the corresponding second lens unit 51. Figure 45 Both the first lens unit 31 and the second lens unit 51 are made of polycarbonate (POLYCARB) material.

[0216] The fourth surface 512 is a planar binary phase surface. The phase structure of the fourth surface 512 is used to diverge light. The thickness of the second lens unit 51 is 0.3 mm. The optical radius of the fourth surface 512 is 0.35 mm. The diffraction order of the fourth surface 512 is 1. The maximum quadratic term of the fourth surface 512 is 3. The normalized radius of the fourth surface 512 is 1. The phase of the quadratic term of the fourth surface 512 is 8957.885844. The phase of the fourth fourth term of the fourth surface 512 is -40483.7. The phase of the sixth term of the fourth surface 512 is 424354.1. The maximum beam angle of the third beam 13 can be maximized.

[0217] The third surface 511 is a planar binary phase surface. The phase structure of the third surface 511 is used to diverge light. The distance between the third surface 511 and the light-blocking plate 40 is 0.413396241 mm. The optical radius of the third surface 511 is 0.35 mm. The diffraction order of the third surface 511 is 1. The maximum quadratic term of the third surface 511 is 1. The normalized radius of the third surface 511 is 1. The phase of the quadratic term of the third surface 511 is -8502.398651. The distance between the light-blocking plate 40 and the second surface 312 is 0.189996943 mm. The optical radius of the light-blocking plate 40 is 0.07364902 mm.

[0218] The second surface 312 is a planar binary phase surface. The phase structure of the second surface 312 is used to converge light rays. The thickness of the first lens unit 31 is 0.3 mm. The optical radius of the second surface 312 is 0.35 mm. The diffraction order of the second surface 312 is 1. The maximum quadratic term of the second surface 312 is 1. The normalized radius of the second surface 312 is 1. The phase of the quadratic term of the second surface 312 is -2574.12453.

[0219] The first surface 311 is a planar binary phase surface. The phase structure of the first surface 311 is used to converge light rays. The distance between the first surface 311 and the projected light field 14 is 0.246578895 mm. The optical radius of the first surface 311 is 0.35 mm. The diffraction order of the first surface 311 is 1. The largest quadratic term of the first surface 311 is 3. The normalized radius of the first surface 311 is 1. The phase of the quadratic term of the first surface 311 is -18509.40145, the phase of the fourth term of the first surface 311 is 92315.94, and the phase of the sixth term of the first surface 311 is -3250301. The optical radius of the projected light field 14 is 0.33863354 mm.

[0220] In some embodiments, both the first lens unit 31 and the second lens unit 51 are planar diffractive optical lenses. Please refer to [reference needed] for the binary phase profile parameters of the first lens unit 31 and the corresponding second lens unit 51. Figure 46Both the first lens unit 31 and the second lens unit 51 are made of polycarbonate (POLYCARB) material.

[0221] The fourth surface 512 is a planar binary phase surface. The phase structure of the fourth surface 512 is used to diverge light. The thickness of the second lens unit 51 is 0.35 mm. The optical radius of the fourth surface 512 is 0.35 mm. The normalized radius of the fourth surface 512 is 0.35. The phase of the quadratic term of the fourth surface 512 is 312.7821238. The phase of the fourth fourth term of the fourth surface 512 is 23.12336081. The phase of the sixth term of the fourth surface 512 is 1.50433421. The phase of the eighth term of the fourth surface 512 is 0.23276542.

[0222] The third surface 511 is a planar binary phase surface. The phase structure of the third surface 511 is used to diverge light. The distance between the third surface 511 and the light-blocking plate 40 is 0.432133212 mm. The optical radius of the third surface 511 is 0.35 mm, the normalized radius of the third surface 511 is 0.35, the phase of the second term of the third surface 511 is -433.6236544, the phase of the fourth term of the third surface 511 is 41.76531216, the phase of the sixth term of the third surface 511 is -0.504421491, and the phase of the eighth term of the third surface 511 is -0.232133334. The distance between the light-blocking plate 40 and the second surface 312 is 0.19 mm, and the optical radius of the light-blocking plate 40 is 0.07651646 mm.

[0223] The second surface 312 is a planar binary phase surface. The phase structure of the second surface 312 is used to converge light rays. The thickness of the first lens unit 31 is 0.3 mm. The optical radius of the second surface 312 is 0.35 mm. The normalized radius of the second surface 312 is 0.35. The phase of the second surface 312 is 233.8776887, the phase of the second surface 312 is 22.77621765, the phase of the second surface 312 is -0.442421421, and the phase of the second surface 312 is -0.231232321.

[0224] The first surface 311 is a planar binary phase surface. The phase structure of the first surface 311 is used to converge light rays. The distance between the first surface 311 and the projected light field 14 is 0.196321331 mm. The optical radius of the first surface 311 is 0.35 mm. The normalized radius of the first surface 311 is 0.35. The phase of the second term of the first surface 311 is 5431.659474, the phase of the fourth term of the first surface 311 is 32.78903897, the phase of the sixth term of the first surface 311 is 1.789008321, and the phase of the eighth term of the first surface 311 is 0.758156845. The optical radius of the projected light field 14 is 0.3484178 mm.

[0225] In some embodiments, the distance between two projected light fields 14 in different lens assemblies 100 is less than or equal to 1 mm.

[0226] In some embodiments, each emitting light source 200 is used to emit a first beam 11 of different wavelengths, enabling the lighting device 1000 to have different functions. For example, each emitting light source 200 can be used to emit visible ultraviolet light, 365nm-390nm ultraviolet light, and 760nm-1000nm near-infrared light, respectively. Activating the emitting light source 200 that emits visible ultraviolet light can identify banknotes, activating the emitting light source 200 that emits 365nm-390nm ultraviolet light can disinfect, and activating the emitting light source 200 that emits 760nm-1000nm near-infrared light can enable night vision devices and monitoring equipment to image under low light conditions.

[0227] In some embodiments, each emitting light source 200 is used to emit a first beam 11 of the same wavelength. When switching between different emitting light sources 200, the illuminated object can appear in the same color, which is suitable for camera equipment.

[0228] In some embodiments, please refer to Figure 47 Two adjacent collimating lenses 20 are spliced ​​together.

[0229] For example, please refer to Figure 47 and Figure 48Both collimating lenses 20 are total internal reflection collimating lenses. In the plane perpendicular to the optical axis X, the orthographic projection of each total internal reflection collimating lens is a segmental shape. The axes of the reflecting prisms 22 in both total internal reflection collimating lenses pass through the centers of the two emitting light sources 200, respectively. Each total internal reflection collimating lens has a cross-section parallel to the optical axis. The cross-sections of the two total internal reflection collimating lenses are connected and symmetrical about the cross-sections. By partially splicing the two total internal reflection collimating lenses together, light rays between the two total internal reflection lenses can be received, resulting in a more uniform distribution of the collimated first beam 11. The ring distance D of the reflecting prisms 22 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm. The smaller ring distance D allows for the placement of multiple reflecting prisms 22 within a smaller space, improving the collimation effect. In the arrangement direction of the two spliced ​​total internal reflection collimating lenses, the distance between the two emitting light sources 200 is 1 mm.

[0230] For example, please refer to Figure 49 The two collimating lenses 20 are total internal reflection collimating lenses. The illumination device 1000 also includes an intermediate collimating lens 60 disposed between the two total internal reflection collimating lenses. On the plane perpendicular to the optical axis, the orthographic projection of the total internal reflection collimating lenses is a semi-circle. The axes of the reflecting prisms 22 in the two total internal reflection collimating lenses pass through the centers of the two emitting light sources 200, respectively. The intermediate collimating lens 60 is disposed between the two total internal reflection collimating lenses along a first direction P, which is perpendicular to the optical axis X. The side of the intermediate collimating lens 60 away from the emitting light source 200 along the optical axis X is perpendicular to the total internal reflection collimating lens 200. The side of the reflecting collimating lens away from the emitting light source 200 along the optical axis X is flush with the side of the intermediate collimating lens 60 near the emitting light source 200 along the optical axis X. An intermediate refractive body and multiple intermediate reflecting prisms are provided on the side of the intermediate collimating lens 60 near the emitting light source 200 along the optical axis X. The intermediate refractive body and multiple intermediate reflecting prisms all extend along the first direction P. The two sides of the intermediate refractive body along the first direction P are respectively connected to the refractive bodies 21 of the two total internal reflection collimating lenses. The two sides of the intermediate refractive body and the refractive bodies 21 in the total internal reflection collimating lenses have the same shape and the same area along the first direction P. The cross sections of the intermediate refractive body perpendicular to the first direction P are all the same.

[0231] The intermediate reflecting prism is connected to the reflecting prisms 22 of the two total internal reflection collimating lenses on both sides along the first direction P. The two opposite sides of the intermediate reflecting prism and the reflecting prism 22 of the total internal reflection collimating lenses have the same shape and area along the first direction P; the cross-sections of the intermediate reflecting prism perpendicular to the first direction P are also the same. The ring spacing D of the reflecting prism 22 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm. The relatively small ring spacing D allows multiple reflecting prisms 22 to be set in a small space, improving the collimation effect. By splicing parts of the two total internal reflection collimating lenses with an intermediate collimating lens 60, the distance between the two total internal reflection collimating lenses can be increased by changing the length of the intermediate collimating lens 60, which facilitates the adjustment of the distance between the two emitting light sources 200 corresponding to the total internal reflection collimating lenses.

[0232] In some embodiments, please refer to Figures 1 to 4 The lighting device 1000 includes multiple light sources 200 and multiple lens assemblies 100. The multiple light sources 200 are disposed on the same plane perpendicular to the optical axis X, and the light sources 200 are used to emit a first light beam 11. The multiple lens assemblies 100 are respectively disposed on one side of the multiple light sources 200 along the optical axis X. The lens assembly 100 includes a collimating lens 20, a first lens group 30, a light-blocking plate 40 and a second lens group 50 arranged sequentially along the optical axis X. The collimating lens 20 is disposed between the light source 200 and the first lens group 30 along the optical axis X.

[0233] Collimating lens 20 is used to collimate the first beam 11 and direct it toward the first lens group 30. Multiple first lens groups 30 are disposed on the same plane perpendicular to the optical axis X. The first lens groups 30 are used to converge the first beam 11 and emit the second beam 12. Each first lens group 30 includes multiple first lens units 31, which are arranged in an array on the plane perpendicular to the optical axis. Each first lens unit 31 is any one of an aspherical lens, a Fresnel lens, a plane diffractive optical lens, or a plane superlens. Multiple light-blocking plates 40 are disposed on the same plane perpendicular to the optical axis X, and are an integral structure. Each light-blocking plate 40 has multiple light-transmitting holes 41, which correspond to multiple first lens units 31 and multiple second lens units 51, respectively. Along the optical axis X, the second lens group 50 and the first lens group 30 in each lens assembly 100 are spaced at different distances. The second lens group 50 in each lens assembly 100 can refract each second beam 12 and emit a third beam 13 with different beam angles.

[0234] The second aspect of this application also provides a mobile terminal, which includes the lighting device 1000 of any one of the first aspect embodiments. The mobile terminal includes mobile phones, tablets, artificial intelligence devices, AR glasses (Augmented Reality Goggles), VR glasses (Virtual Reality Glasses), automobiles, robots, etc.

[0235] The beneficial effects of the embodiments of this application are as follows: The embodiments of this application include the lighting device 1000 in the first aspect embodiment, which can change the area illuminated by the third beam 13 emitted by the mobile terminal according to actual needs, can solve the technical problem that a light source with a single illumination angle cannot adapt to multiple field of view angles of the mobile phone lens, and can improve the utilization efficiency of the light source, and has all the advantages of the lighting device 1000.

[0236] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lighting device, characterized in that, include: Multiple light sources are used to emit the first beam; Multiple lens assemblies are respectively disposed on one side of the multiple emitting light sources along the optical axis. Each lens assembly includes a first lens group and a second lens group. The first lens group is disposed between the emitting light source and the second lens group along the optical axis. The first lens group is used to converge the first beam and emit a second beam. In the optical axis direction, the second lens group in each lens assembly is spaced at a different distance from the first lens group, and the second lens group in each lens assembly can refract each second beam and emit a third beam with a different beam angle.

2. The lighting device as claimed in claim 1, characterized in that, The lens assembly further includes a collimating lens, which is disposed between the light source and the first lens group. The collimating lens is used to collimate the first light beam and direct it toward the first lens group.

3. The lighting device as described in claim 2, characterized in that, The collimating lens is a total internal reflection collimating lens. The side of the total internal reflection collimating lens away from the emitting light source along the optical axis is a plane. A refractive element and multiple annular reflecting prisms are provided on the side of the total internal reflection collimating lens closest to the emitting light source along the optical axis. The axis of the refractive element coincides with the center line of the emitting light source, and the multiple reflecting prisms are arranged around the refractive element; or... The collimating lens is one of the following: an aspherical collimating lens, a superlens, and a diffractive optical element.

4. The lighting device as claimed in claim 1, characterized in that, The first lens group includes a plurality of first lens units, which are arranged in an array on a plane perpendicular to the optical axis. The second lens group includes a plurality of second lens units corresponding to the first lens unit, and the plurality of second lens units are arranged in an array on a plane perpendicular to the optical axis.

5. The lighting device as described in claim 4, characterized in that, The first lens unit is any one of a spherical lens, an aspherical lens, a Fresnel lens, a planar diffractive optical lens, and a planar superlens; And / or, the second lens unit is any one of a spherical lens, an aspherical lens, a Fresnel lens, a planar diffractive optical lens, and a planar superlens.

6. The lighting device as claimed in claim 4, characterized in that, Multiple first lens units are arranged in a rectangular array; multiple second lens units are arranged in a rectangular array.

7. The lighting device as described in any one of claims 1-6, characterized in that, In the lens assembly where the distance between the second lens group and the first lens group along the optical axis is the smallest, the focal length of the first lens group is greater than the distance between the optical center of the first lens group and the second lens group. In the lens assembly where the second lens group and the first lens group are at the greatest distance along the optical axis, the focal length of the first lens group is less than the distance between the optical center of the first lens group and the second lens group.

8. The lighting device as described in any one of claims 4-6, characterized in that, The lens assembly further includes a light-blocking plate disposed between the first lens group and the second lens group. The light-blocking plate has a plurality of light-transmitting holes, each of which corresponds to a plurality of the first lens units and a plurality of the second lens units.

9. The lighting device as claimed in claim 8, characterized in that, The light-blocking plate is made of black material, and the thickness of the light-blocking plate along the optical axis is less than or equal to 0.2 mm; and / or, The aperture of the light-transmitting hole is less than or equal to 0.3 mm.

10. The lighting device as described in claim 8, characterized in that, In the direction of the optical axis, multiple light-blocking plates in the multiple lens assemblies are disposed on the same plane perpendicular to the direction of the optical axis.

11. The lighting device as claimed in any one of claims 1-6, characterized in that, The plurality of the first lens groups in the plurality of the lens assemblies are disposed on the same plane perpendicular to the optical axis.

12. The lighting device as described in claim 2 or 3, characterized in that, The collimating lenses in the plurality of lens assemblies are disposed on the same plane perpendicular to the optical axis.

13. The lighting device as described in any one of claims 1-6, characterized in that, On a plane perpendicular to the optical axis, a plurality of the emitting light sources are distributed in a rectangular or hexagonal array. On a projection plane perpendicular to the optical axis, the orthographic projections of a plurality of the lens assemblies are distributed in a rectangular or hexagonal array.

14. A mobile terminal, characterized in that, Includes the lighting device as described in any one of claims 1-13.

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