A light supplementing lens and a design method of light supplementing lens

Abstract

The application discloses a light supplementing lens and a design method of the light supplementing lens. The light supplementing lens provided by the application virtually converts light emitted by a light source into light emitted by a virtual focal point through a virtual focal plane. The virtual focal point has a smaller light emitting angle than the light source, thereby avoiding total reflection of the light emitted by the light source with a large angle on a subsequent light emitting surface, and improving the efficiency of the lens. The light spot area corresponding to each sub-surface of the light emitting surface is all or part of the final light spot area, and the final light spot area is matched with the field of view of the lens. The illumination distribution of the light emitting surface is matched with the preset distribution of the lens. The light supplementing lens provided by the application improves the light efficiency while solving the glare problem of visible light supplementing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical design, in particular to a light supplementing lens and a design method of the light supplementing lens. BACKGROUND

[0002] In the field of security monitoring, a combination of light emitting diodes (LEDs) and secondary lenses is often used for light supplementing of cameras. This light supplementing method can effectively solve the problem of dark and unclear images caused by insufficient scene illumination at night, and is suitable for various scenes. The secondary lens generally adopts a total internal reflection (TIR) or convex lens configuration, and is matched with a large-angle light source such as 120° / 90°, which has high light supplementing efficiency and light distribution shaping design freedom, and can achieve various angles, intensities, uniformities, and spot shapes. Currently, the conventional lens still uses a circular spot to cover the field of view angle to supplement the light for the camera.

[0003] However, due to the characteristics of the secondary lens, this light supplementing lamp combination method has a serious glare problem when illuminating the human eye, especially the circular lens, which has a large part outside the field of view area, wasting energy and causing glare outside the area, which is not good for the human eye. SUMMARY

[0004] Embodiments of the present application provide a light supplementing lens and a design method of the light supplementing lens to solve the glare problem existing in the prior art.

[0005] The present application provides a light supplementing lens, comprising: a lens bottom surface, a virtual focal surface, an out-light surface, and a lens side wall; the out-light surface is spliced by each sub-surface;

[0006] The lens bottom surface and the virtual focal surface are connected, and the lens side wall is connected to the out-light surface and the lens bottom surface, respectively;

[0007] The virtual focal surface virtually converts the light emitted by the light source into light emitted by a virtual focal point, wherein the virtual focal point has a smaller light emitting angle than the light source;

[0008] Each sub-surface of the out-light surface corresponds to a full or partial final spot area, wherein the final spot area is formed by superimposing the illumination distribution of each sub-surface; the final spot area matches the lens field of view angle; and the illumination distribution of the out-light surface matches the preset distribution of the lens.

[0009] On the other hand, the present application provides a design method of a light supplementing lens, comprising:

[0010] Each primary sub-surface in the out-light surface of the light supplementing lens is obtained through an oval surface iteration;

[0011] For each primary sub-surface, an oval surface iteration is performed on the primary sub-surface to obtain each secondary sub-surface corresponding to the primary sub-surface;

[0012] Each secondary sub-surface is fitted by polynomial orthogonalization to obtain a smooth sub-surface corresponding to the primary sub-surface;

[0013] Each smooth sub-surface is spliced to obtain the light-out surface;

[0014] The light-out surface and the virtual focal surface of the light-supplement lens are combined in space to generate the light-supplement lens.

[0015] Further, the oval surface iteration is performed to obtain each primary sub-surface in the light-out surface of the light-supplement lens, comprising:

[0016] The focal spot area of each primary sub-surface is determined, and the focal point corresponding to each primary sub-surface is determined according to the focal spot area of each primary sub-surface;

[0017] The focal point corresponding to each primary sub-surface and the initial optical path are input into the oval surface formula to obtain each primary sub-surface.

[0018] Further, the determination of the focal spot area of each primary sub-surface comprises:

[0019] The distortion viewfinder of the lens is obtained, the illumination distribution of the light-supplement lens is determined according to the distortion viewfinder, and the target focal spot area is determined according to the illumination distribution;

[0020] The focal spot area of each primary sub-surface is determined according to the target focal spot area.

[0021] Further, for each primary sub-surface, the focal spot area of the primary sub-surface is the target focal spot area; or the focal spot area of the primary sub-surface is part of the target focal spot area.

[0022] Further, the input of the focal point corresponding to each primary sub-surface and the initial optical path into the oval surface formula to obtain each primary sub-surface comprises:

[0023] The focal point corresponding to each primary sub-surface and the initial optical path are input into the oval surface formula to obtain each primary initial sub-surface; the light distribution curve of the light-supplement lens is obtained, the initial light flux of each primary initial sub-surface is determined according to the light distribution curve, and it is judged whether the initial light flux meets the requirements. If yes, the primary initial sub-surface is used as a primary sub-surface, and if no, the optical path constant of the initial optical path is adjusted, and each primary initial sub-surface is obtained again until the initial light flux of each primary initial sub-surface meets the requirements.

[0024] Further, the judgment of whether the initial light flux meets the requirements comprises:

[0025] The target luminous flux of each primary sub-face is determined based on the spot area of ​​each primary sub-face.

[0026] Determine whether the initial luminous flux of each of the first initial sub-surfaces meets the target luminous flux. If yes, determine that the initial luminous flux meets the requirement; otherwise, determine that the initial luminous flux does not meet the requirement.

[0027] Further, determining the initial luminous flux of each primary initial sub-surface based on the light distribution curve includes:

[0028] If the primary initial sub-surfaces overlap, the initial luminous flux of each primary initial sub-surface is determined based on the light distribution curve and the protruding portion of each primary initial sub-surface.

[0029] Furthermore, the step of generating the supplementary lens by combining the spatial relationships of the light-emitting surface, the virtual focal surface of the supplementary lens, the bottom surface of the lens, and the sidewall of the lens includes:

[0030] An auxiliary surface is added based on the spatial relationship between the light-emitting surface and the virtual focal surface of the supplementary lens, and the supplementary lens is generated based on the light-emitting surface, the virtual focal surface, and the auxiliary surface; wherein, the auxiliary surface includes the lens sidewall and the lens bottom surface of the supplementary lens.

[0031] Furthermore, the design process of the virtual focal plane includes:

[0032] Determine the location of the virtual focal point and the initial value of the first point on the virtual focal plane;

[0033] With the direction of the first ray unchanged, obtain the tangent at the first point;

[0034] The second point is obtained by finding the intersection of the second ray and the tangent of the first point;

[0035] The direction of the second ray is determined by the line connecting the second point and the virtual focal point;

[0036] The tangent of the second point is determined based on the direction of the second ray's emission and incident.

[0037] The virtual focal plane is generated cyclically.

[0038] The application provides a light supplementing lens and a design method of the light supplementing lens, which comprises a lens bottom surface, a virtual focal plane, a light emitting surface and a lens side wall; the light emitting surface is spliced by each sub-surface; the lens bottom surface is connected with the virtual focal plane, and the lens side wall is connected with the light emitting surface and the lens bottom surface respectively; the virtual focal plane virtually converts light emitted by a light source into light emitted by a virtual focal point, wherein the light emitting angle of the virtual focal point is smaller than the light emitting angle of the light source; the corresponding light spot area of each sub-surface of the light emitting surface is all or part of a final light spot area, wherein the final light spot area is formed by superimposing the illumination distribution of each sub-surface; the final light spot area matches the lens field of view angle; and the illumination distribution of the light emitting surface matches the preset distribution of the lens.

[0039] The technical solution has the following advantages or beneficial effects:

[0040] The light supplementing lens provided by the application virtually converts light emitted by a light source into light emitted by a virtual focal point, wherein the light emitting angle of the virtual focal point is smaller than the light emitting angle of the light source, so that the large-angle light emitted by the light source can be prevented from being totally reflected on a subsequent light emitting surface, and the efficiency of the lens can be improved. The corresponding light spot area of each sub-surface of the light emitting surface is all or part of a final light spot area, the final light spot area matches the lens field of view angle, and the illumination distribution of the light emitting surface matches the preset distribution of the lens. The light supplementing lens provided by the application can improve the light efficiency and solve the problem of glare in visible light supplementing. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0042] Figure 1 The structure schematic diagram of the light supplementing lens provided by the application is shown in the figure.

[0043] Figure 2 The design process schematic diagram of the light supplementing lens provided by the application is shown in the figure.

[0044] Figure 3 The design flowchart of the light supplementing lens provided by the application is shown in the figure.

[0045] Figure 4 The distortion field of view and the illumination distribution schematic diagram provided by the application is shown in the figure.

[0046] Figure 5 The virtual focal mapping schematic diagram provided by the application is shown in the figure.

[0047] Figure 6Subsurface division and flux matching schematic diagram provided for the present application;

[0048] Figure 7 SQM egg type surface iteration process schematic diagram provided for the present application;

[0049] Figure 8 Orthogonal polynomial fitting schematic diagram provided for the present application. DETAILED DESCRIPTION

[0050] For the purpose of making the object and implementation of the present application more clear, the following will combine the drawings in the exemplary embodiments of the present application to clearly and completely describe the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only a part of the embodiments of the present application, but not all the embodiments.

[0051] It should be noted that the brief description of the terms in the present application is only for the convenience of understanding the following described embodiments, and is not intended to limit the embodiments of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and general meanings.

[0052] The terms "first", "second", "third" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit the specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchanged under appropriate circumstances.

[0053] The terms "include" and "have" and any variations thereof are intended to cover but not exclusive inclusion, for example, a product or device including a series of components does not necessarily limit to all the components clearly listed, but can include other components not clearly listed or inherent to these products or devices.

[0054] The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic or combination of hardware or / and software code capable of performing functions associated with the element.

[0055] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0056] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

[0057] Figure 1 The schematic diagram of the supplementary light lens structure provided in this application includes: a lens bottom surface 11, a virtual focal surface 12, a light-emitting surface 13, and a lens sidewall 14; the light-emitting surface 13 is composed of various sub-surfaces 15 spliced ​​together.

[0058] The bottom surface 11 of the lens is connected to the virtual focal surface 12, and the sidewall of the lens 14 is connected to the light-emitting surface 13 and the bottom surface 11 of the lens, respectively.

[0059] The virtual focal plane 14 virtually converts the light emitted by the light source into light emitted from the virtual focal point, wherein the light emission angle of the virtual focal point is smaller than the light emission angle of the light source;

[0060] The light spot area corresponding to each sub-surface 15 of the light-emitting surface 13 is all or part of the final light spot area, wherein the final light spot area is formed by superimposing the illuminance distribution of each sub-surface 15; the final light spot area matches the field of view of the lens; and the illuminance distribution of the light-emitting surface 13 matches the preset distribution of the lens.

[0061] like Figure 1 As shown, the lens body mainly consists of a virtual focal surface and a light-emitting surface, as well as a bottom surface and side walls.

[0062] The virtual focal plane is a freeform surface. The light source is positioned at the origin of the virtual focal plane. Light rays emitted from the light source are refracted by the virtual focal plane and enter the lens. The backward extensions of the refracted light rays intersect at a single point, which is the virtual focal point. The virtual focal point is located on the optical axis of the lens, further away from the lens behind the light source. The virtual focal plane virtually converts the light rays emitted from the light source into rays emitted from the virtual focal point. The virtual focal angle is smaller than the light source angle, preventing total internal reflection of large-angle light rays at the subsequent light-emitting surface, thus improving lens efficiency.

[0063] The light-emitting surface is composed of multiple sub-surfaces. The origin of the light-emitting surface is a virtual focal point. Each sub-surface projects the luminous flux of its corresponding portion onto the target surface according to the required illuminance distribution. The illuminance distributions of all sub-surfaces are superimposed to form the final light spot distribution. Each sub-surface can have a uniform or non-uniform illuminance distribution, and each sub-surface light spot can cover the final light spot or only be a part of the final light spot.

[0064] The light-out surface is obtained by twice ovoid surface iteration and once polynomial orthogonal fitting. Since each sub-surface of the light-out surface corresponds to the whole or part of the final light spot, compared with the conventional mapping relationship, the light-emitting surfaces between the sub-surfaces are staggered, which can increase the actual light-emitting area and optimize the white light compensation and glare. Since the point-to-point mapping relationship is adopted, the final light spot distribution area can completely simulate the lens field of view angle and its distortion, that is, the light spot and the field of view angle can be accurately matched, and the illumination distribution is basically consistent with the preset distribution. Compared with the conventional circular light spot or rectangular light spot, the light efficiency is higher, and the light compensation effect is more suitable for the scene.

[0065] The light compensation lens provided in the application virtually converts the light emitted by the light source into light emitted by a virtual focal point, wherein the light emitting angle of the virtual focal point is smaller than the light emitting angle of the light source, avoiding total reflection of the large-angle light source emitted by the light source on the subsequent light-out surface, and improving the efficiency of the lens. The light spot area corresponding to each sub-surface of the light-out surface is the whole or part of the final light spot area, and the final light spot area matches the lens field of view angle; the illumination distribution of the light-out surface matches the preset distribution of the lens. The light compensation lens provided in the application improves the light efficiency while solving the glare problem of visible light compensation.

[0066] Figure 2 A process diagram for designing the light compensation lens provided in the application is provided, which includes the following steps:

[0067] S101: Obtain each primary sub-surface in the light-out surface of the light compensation lens by ovoid surface iteration. The ovoid surface iteration can be SQM ovoid surface iteration.

[0068] S102: For each primary sub-surface, perform ovoid surface iteration on the primary sub-surface to obtain each secondary sub-surface corresponding to the primary sub-surface.

[0069] S103: Fit each secondary sub-surface by polynomial orthogonal fitting to obtain a smooth sub-surface corresponding to the primary sub-surface. The polynomial orthogonal fitting can be Q-Legendre polynomial orthogonal fitting.

[0070] S104: Splice each smooth sub-surface to obtain the light-out surface.

[0071] S105: Combine the space relationship according to the light-out surface and the virtual focal surface of the light compensation lens to generate the light compensation lens.

[0072] The light compensation lens design process provided in the application is applied to an electronic device, which can be a PC, a tablet computer, etc., or a server.

[0073] In the present application, firstly, each primary sub-surface in the light-out surface of the light-supplement lens is obtained through SQM oval surface iteration, and then SQM oval surface iteration is performed on the primary sub-surface to obtain each secondary sub-surface corresponding to the primary sub-surface. Then, for each primary sub-surface, each secondary sub-surface corresponding to the primary sub-surface is fitted through Q-Legendre polynomial orthogonal fitting to obtain a smooth sub-surface corresponding to the primary sub-surface. Then, each smooth sub-surface is spliced to obtain the light-out surface of the light-supplement lens. Finally, the light-out surface and the virtual focal surface of the light-supplement lens are combined according to the spatial relationship to generate the light-supplement lens.

[0074] The present application generates the final light-out surface through twice SQM oval surface iteration and once Q-Legendre polynomial orthogonal fitting, can realize the design of the lens with accurate matching of light supplement and distorted field of view and controllable illumination distribution, improves the light efficiency, and solves the glare problem of visible light supplement.

[0075] In the present application, the SQM oval surface iteration to obtain each primary sub-surface in the light-out surface of the light-supplement lens comprises:

[0076] The focal spot area of each primary sub-surface is determined, and the focal point corresponding to each primary sub-surface is determined according to the focal spot area of each primary sub-surface.

[0077] The focal point corresponding to each primary sub-surface and the initial optical path are input into the SQM oval surface formula to obtain each primary sub-surface.

[0078] Specifically, the determination of the focal spot area of each primary sub-surface comprises:

[0079] The distortion view point map of the lens is obtained, the illumination distribution of the light-supplement lens is determined according to the distortion view point map, and the target focal spot area is determined according to the illumination distribution.

[0080] The focal spot area of each primary sub-surface is determined according to the target focal spot area.

[0081] And, for each primary sub-surface, the focal spot area of the primary sub-surface is the target focal spot area; or the focal spot area of the primary sub-surface is part of the target focal spot area.

[0082] If the focal spot area of the primary sub-surface is part of the target focal spot area, the focal spot area formed by the whole primary sub-surface is the target focal spot area.

[0083] In the present application, the SQM oval surface formula is input into the focal point corresponding to each primary sub-surface and the initial optical path to obtain each primary sub-surface.

[0084] inputting the focal point corresponding to each primary sub-face and the initial optical path into the SQM oval surface formula to obtain each primary initial sub-face; obtaining a light distribution curve of the light supplement lens, determining the initial light flux of each primary initial sub-face according to the light distribution curve, judging whether the initial light flux meets the requirement, if yes, taking the primary initial sub-face as a primary sub-face, if not, adjusting the optical path constant of the initial optical path, and re-obtaining each primary initial sub-face until the initial light flux of each primary initial sub-face meets the requirement.

[0085] Specifically, the judging whether the initial light flux meets the requirement comprises:

[0086] determining a target light flux of each primary sub-face according to the light spot area of each primary sub-face;

[0087] judging whether the initial light flux of each primary initial sub-face meets the target light flux, if yes, determining that the initial light flux meets the requirement, if not, determining that the initial light flux does not meet the requirement.

[0088] Specifically, the determining the initial light flux of each primary initial sub-face according to the light distribution curve comprises:

[0089] if there is an overlap between each primary initial sub-face, determining the initial light flux of each primary initial sub-face according to the light distribution curve and the protruding part of each primary initial sub-face.

[0090] In the present application, the generating the light supplement lens according to the light emitting surface, the virtual focal surface, the lens bottom surface and the lens side wall of the light supplement lens comprises:

[0091] adding an auxiliary surface according to the spatial relationship between the light emitting surface and the virtual focal surface of the light supplement lens, and generating the light supplement lens according to the light emitting surface, the virtual focal surface and the auxiliary surface; wherein the auxiliary surface comprises the lens side wall and the lens bottom surface of the light supplement lens.

[0092] The design process of the virtual focal surface comprises:

[0093] determining the virtual focal point position and the initial value of the first point of the virtual focal surface;

[0094] obtaining the tangent of the first point while the direction of the first light ray is unchanged;

[0095] obtaining the second point according to the intersection of the second light ray and the tangent of the first point;

[0096] determining the exit direction of the second light ray according to the line connecting the second point and the virtual focal point;

[0097] determining the tangent of the second point according to the exit and entrance directions of the second light ray.

[0098] The virtual focal plane is generated by circulation.

[0099] Figure 3 A light supplement lens design flowchart is provided for the present application. It includes: obtaining a lens distortion view point map, analyzing scene preset illuminance distribution, selecting appropriate parameters to solve the virtual focal plane, obtaining the virtual focal angle and the light distribution curve, presetting the total flux and the light spot area of the sub-plane, determining the second focal point and the initial optical path (the second focal point is the focal point corresponding to each primary sub-plane), substituting the oval line formula to generate the corresponding sub-plane, calculating the sub-plane flux in combination with the light distribution curve, judging whether the energy meets the preset distribution, if yes, obtaining the primary sub-plane and the corresponding solid angle, if not, adjusting the optical path constant and substituting the oval line formula to generate the corresponding sub-plane, obtaining the primary sub-plane and the corresponding solid angle, and then presetting the illuminance distribution in the sub-plane area, generating binary sub-planes (or secondary sub-planes) through sub-plane iteration, each sub-plane is iterated separately once, then the binary sub-planes are optimized through polynomial smoothing, each binary sub-plane is optimized separately once, the sub-planes are spliced to generate the final light emitting surface, and the light emitting surface and the virtual focal plane are combined to generate the lens.

[0100] Figure 4 A distortion field and illuminance distribution diagram is provided for the present application. After the camera distortion correction, there will be some residual, at this time the field of view presents a curved state. At a certain distance, the distortion field is matched as a light spot, and the light spot illuminance distribution is preset according to the scene characteristics, Figure 4 It is only a preset condition for example.

[0101] Figure 5 A virtual focal mapping diagram is provided for the present application. As Figure 5 shown, the virtual focal light emitting angle can be controlled by controlling the distance from the virtual focal point to the light source, the virtual focal plane can be established as a mathematical model and solved by numerical methods such as ODE, clipping method, etc. The numerical solving method can refer to the existing calculation, which will not be repeated here.

[0102] The process of generating the virtual focal plane is as follows:

[0103] The virtual focal point position and the initial value of the first point of the virtual focal plane are determined artificially;

[0104] The first light direction is unchanged, and the tangent of the first point is obtained;

[0105] The intersection of the second light and the tangent of the first point is obtained as the second point;

[0106] The line connecting the second point and the virtual focal point is the second light emitting direction;

[0107] The tangent of the second point is obtained according to the second light emitting and incident direction;

[0108] This cycle is repeated to finally obtain the virtual focal plane.

[0109] After the virtual focal plane is formed, the emission angle of the virtual light source is determined. The light distribution curve of the virtual light source can be modeled and imported into optical software for simulation. The light distribution curve is used for subsequent luminous flux calculation. When using it, it can be discretized or fitted by a function.

[0110] Figure 6 This diagram illustrates the subsurface division and flux allocation provided in this application. The subsurface spot area is determined, and the luminous flux allocation for each subsurface area is preset. The luminous flux allocation is calculated by back-calculating the final spot illuminance distribution and the size of each subsurface area, as shown below. Figure 6 In one scenario, the light spot area of ​​each sub-face is consistent with the final light spot area; in another scenario, the light spot area of ​​each sub-face is part of the final light spot. The number of sub-faces can be adjusted according to the glare design requirements. If a better glare reduction effect is required, the number of sub-faces can be increased appropriately, but the computational load will also increase exponentially.

[0111] Figure 7 This application provides a schematic diagram of the SQM oval surface iteration process, as shown below. Figure 7 As shown, the second focus is the center of the sub-surface region. The initial optical path lengths are all set to be consistent. Substituting these into the oval-shaped surface formula yields each sub-surface. The exposed portion of each intersecting sub-surface is the effective portion. Integrating the solid angle corresponding to the effective portion with the light distribution curve yields the corresponding luminous flux. If the luminous flux ratio does not meet the preset value, the optical path constant is adjusted using negative feedback, causing the effective portion of each sub-surface to change accordingly. This process is repeated until the preset ratio is met, at which point the iteration exits, and one sub-surface is obtained.

[0112] Repeat the above steps on each first-order sub-face to obtain a set of binary sub-faces on each sub-face.

[0113] Figure 8 This is a schematic diagram of orthogonal polynomial fitting provided in this application. The core of orthogonal polynomial optimization is to select a constant point on each binary sub-surface, where the mapping relationship of this point remains unchanged before and after optimization. A smooth surface is obtained through polynomial fitting, such as... Figure 8 As shown, due to the edge light principle and streamline theorem, the flux originally concentrated at a single point will be homogenized throughout the region. Optimizing each set of binary sub-surfaces once yields a smooth sub-surface.

[0114] Multiple smooth sub-surfaces are eventually spliced ​​together to form the light-emitting surface. The light-emitting surface, the defocused surface, the bottom surface, and the sidewalls are combined to form the lens entity.

[0115] To facilitate understanding of the solution, the concepts and logic involved in this application are explained as follows:

[0116] Distortion viewpoint diagram: Lens imaging distortion causes the field of view to be not a strict rectangle, but rather something like... Figure 4 The shape; can be captured by the camera; logically, scene limitations are set;

[0117] Illuminance distribution: the illuminance distribution in the distorted field is artificially given according to the requirements, which is the final goal to be achieved in the design; logically, it provides a target for the setting of sub-face flux and spot area;

[0118] Virtual focal plane / virtual focal angle / distribution curve: the light source itself has a large emission angle, but it can be focused through the optical surface. If the focused light beam can be considered as emitted from a point, then this point is the virtual focus, the optical surface is the virtual focal plane, the angle of the focused light beam is the virtual focal angle, and the intensity distribution of the focused light beam is the distribution curve of the virtual light source; logically, it provides a basis for calculating the sub-face flux;

[0119] Sub-face luminous flux / sub-face spot area: according to the preset illuminance distribution, the spot area corresponding to each sub-face is artificially determined. The spot area of each sub-face can be equivalent to the final spot or a part of the final spot, and the spot areas of various sub-faces can partially overlap. After determination, the corresponding luminous flux of each sub-face can be calculated; logically, it corresponds to the decomposition of the illuminance distribution, and at the same time, it serves as a judgment standard for whether the energy meets the preset distribution;

[0120] Initial optical path: a set of constants artificially given, including subsequent optical path constants, which are used to generate the oval surface; logically, it provides initial values for the oval line formula;

[0121] If multiple sub-faces overlap, the protruding part of each sub-face is the effective part, and the corresponding flux can be calculated in combination with the distribution curve;

[0122] Obtain a primary sub-face. At this time, the spot corresponding to each sub-face is a point, such as 9 sub-face spots being 9 discrete points. On this basis, polynomial smoothing can obtain a continuous spot.

[0123] The second SQM is repeated on each sub-face based on the primary sub-face obtained in the first time according to the above steps.

[0124] Taking a certain sub-face as an example, the spot area and illuminance corresponding to the sub-face have been preset above, and the spot area and illuminance distribution are further refined on this basis. Logically, it is a further refinement of the total flux and spot area of the preset sub-face, but it is equivalent to the preset total flux and spot area of the sub-face in terms of the effect of the SQM operation, and it also serves as the judgment standard for the second SQM cycle.

[0125] After the cycle meets the judgment condition, a binary sub-face is obtained, which is a sub-face based on a primary sub-face.

[0126] For each binary sub-face on each primary sub-face, a Figure 8 The optimization shown obtains a smooth surface similar to the primary sub-face, and at this time, the corresponding spot is no longer a point, but a refined spot;

[0127] A plurality of optimized primary sub-surfaces are spliced into an outlight surface, and their corresponding light spots are also spliced and superimposed into a final light spot; the outlight surface and the virtual focal surface are combined according to the spatial relationship and auxiliary surfaces such as side walls are added, and finally a lens entity can be generated.

[0128] The light supplement lens designed in the application is different from the scale armor surface, and each sub-surface light spot can cover the overall light spot through accurate calculation, and the glare reduction effect is more obvious. Based on the convex lens and the SQM algorithm, the light spot shape and internal illumination distribution can be accurately controlled; the number of sub-surfaces is less than that of the scale armor, the splicing gap is also less, and the light efficiency loss is not obvious. The number of sub-surfaces is less than that of the compound eye, and the light efficiency loss is not obvious; the SQM sub-surface is different from the scale armor surface, and each sub-surface light spot can cover the overall light spot through accurate calculation, and the glare reduction effect is more obvious. The lens light spot can accurately adapt to the distorted field of view, and compared with the conventional circular or rectangular light spot, the light efficiency can be further improved; the light spot illumination distribution can be accurately controlled, and the scene effect is better.

[0129] The application realizes controllable optical design by the cooperation of the virtual focal surface and the outlight surface, improves the light efficiency, and solves the problem of glare in visible light supplement. Through 2 times of SQM oval surface iteration and 1 time of orthogonal polynomial fitting, the lens design that can accurately match the distorted field of view and has controllable illumination distribution is realized. By shrinking the light source beam angle and setting the virtual focal point, the light emitting angle is shrunk, and the light efficiency loss caused by the uncontrollable light of large angle is avoided. The appropriate illumination distribution is determined through scene analysis, and the sub-surface flux ratio is further calculated through the sub-surface division area. The effective part of each sub-surface is adjusted by adjusting the optical path constant, and the flux of each sub-surface is calculated. Whether the flux ratio meets the preset iteration is determined to generate a primary sub-surface. On the basis of the primary sub-surface, the SQM iteration method is used again to generate a binary sub-surface, so that the energy originally concentrated in one point is distributed in multiple points in the binary sub-surface area. The binary sub-surface is optimized into a smooth curved surface through orthogonal polynomial smoothing optimization, and the energy originally concentrated in multiple points is uniformly distributed in the binary sub-surface area. A plurality of sub-surfaces are spliced, each sub-surface corresponds to a light spot, and the light spots are superimposed into a final light spot. The light spot shape accurately matches the lens distorted field of view and the illumination distribution is controllable.

[0130] The application provides a light supplementing lens and a design method of the light supplementing lens. The light supplementing lens comprises a lens bottom surface, a virtual focal plane, a light emitting surface and a lens side wall. The light emitting surface is spliced by each sub-surface. The lens bottom surface is connected with the virtual focal plane, and the lens side wall is connected with the light emitting surface and the lens bottom surface respectively. The virtual focal plane virtually converts light emitted by a light source into light emitted by a virtual focal point, wherein the light emitting angle of the virtual focal point is smaller than the light emitting angle of the light source. The light spot area corresponding to each sub-surface of the light emitting surface is all or part of a final light spot area, wherein the final light spot area is formed by superimposing the illumination distribution of each sub-surface. The final light spot area matches the field of view angle of a lens. The illumination distribution of the light emitting surface matches the preset distribution of the lens.

[0131] The light supplementing lens provided by the application virtually converts light emitted by a light source into light emitted by a virtual focal point, wherein the light emitting angle of the virtual focal point is smaller than the light emitting angle of the light source, thereby avoiding total reflection of the light emitted by the light source with a large angle on a subsequent light emitting surface, and improving the efficiency of the lens. The light spot area corresponding to each sub-surface of the light emitting surface is all or part of a final light spot area, wherein the final light spot area matches the field of view angle of a lens. The illumination distribution of the light emitting surface matches the preset distribution of the lens. The light supplementing lens provided by the application improves the light efficiency while solving the problem of glare in visible light supplementing.

[0132] The design method of the light supplementing lens comprises: obtaining each primary sub-surface in the light emitting surface of the light supplementing lens through oval surface iteration; for each primary sub-surface, performing oval surface iteration on the primary sub-surface to obtain each secondary sub-surface corresponding to the primary sub-surface; fitting each secondary sub-surface through polynomial orthogonal fitting to obtain a smooth sub-surface corresponding to the primary sub-surface; splicing each smooth sub-surface to obtain the light emitting surface; and combining the light emitting surface and the virtual focal plane of the light supplementing lens in space to generate the light supplementing lens.

[0133] First, each primary sub-surface in the light emitting surface of the light supplementing lens is obtained through oval surface iteration, then oval surface iteration is performed again on the primary sub-surface to obtain each secondary sub-surface corresponding to the primary sub-surface, each secondary sub-surface corresponding to the primary sub-surface is fitted through polynomial orthogonal fitting to obtain a smooth sub-surface corresponding to the primary sub-surface, and finally the light emitting surface is spliced and the light supplementing lens is produced. The final light emitting surface is generated through two iterations of oval surface and one fitting of polynomial orthogonal, which can realize the design of a lens with accurate matching of light supplementing and distorted field of view and controllable illumination distribution, improve the light efficiency, and solve the problem of glare in visible light supplementing.

[0134] While the preferred embodiments of the application have been described, additional variations and modifications can be made to these embodiments by those skilled in the art once they have the benefit of the present disclosure without departing from the spirit and scope of the application. Accordingly, it is intended that such additions and modifications be included within the scope of the application. It is the following claims, including any amendments thereto, which define the scope of the application.

[0135] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method of designing an illuminating lens, characterized by, The method comprises the following steps: obtaining each primary sub-surface in the light-out surface of the light-supplement lens through ovoid surface iteration; for each primary sub-surface, performing ovoid surface iteration on the primary sub-surface to obtain each secondary sub-surface corresponding to the primary sub-surface; fitting each secondary sub-surface through polynomial orthogonalization to obtain a smooth sub-surface corresponding to the primary sub-surface; splicing each smooth sub-surface to obtain the light-out surface; combining the light-out surface, the virtual focal surface, the lens bottom surface and the lens side wall of the light-supplement lens in spatial relationship to generate the light-supplement lens.

2. The method of claim 1, wherein, The method of obtaining each primary sub-surface in the light-out surface of the light-supplement lens through ovoid surface iteration comprises the following steps: determining the light spot area of each primary sub-surface, and determining the focal point corresponding to each primary sub-surface according to the light spot area of each primary sub-surface; inputting the focal point corresponding to each primary sub-surface and the initial optical path into the ovoid surface formula to obtain each primary sub-surface.

3. The method of claim 2, wherein, The method of determining the light spot area of each primary sub-surface comprises the following steps: obtaining the distortion view point map of the lens, determining the illumination distribution of the light-supplement lens according to the distortion view point map, determining the target light spot area according to the illumination distribution, and determining the light spot area of each primary sub-surface according to the target light spot area. For each primary sub-surface, the light spot area of the primary sub-surface is the target light spot area, or the light spot area of the primary sub-surface is part of the target light spot area.

4. The method of claim 3, wherein, The method of inputting the focal point corresponding to each primary sub-surface and the initial optical path into the ovoid surface formula to obtain each primary sub-surface comprises the following steps:

5. The method of claim 2, wherein, inputting the focal point corresponding to each primary sub-surface and the initial optical path into the ovoid surface formula to obtain each primary initial sub-surface, obtaining the light distribution curve of the light-supplement lens, determining the initial luminous flux of each primary initial sub-surface according to the light distribution curve, and judging whether the initial luminous flux meets the requirements, if yes, taking the primary initial sub-surface as a primary sub-surface, and if no, adjusting the optical path constant of the initial optical path and re-obtaining each primary initial sub-surface until the initial luminous flux of each primary initial sub-surface meets the requirements. The method of judging whether the initial luminous flux meets the requirements comprises the following steps:

6. The method of claim 5, wherein, determining the target luminous flux of each primary sub-surface according to the light spot area of each primary sub-surface; judging whether the initial luminous flux of each primary initial sub-surface meets the target luminous flux, if yes, determining that the initial luminous flux meets the requirements, and if no, determining that the initial luminous flux does not meet the requirements. The method of determining the initial luminous flux of each primary initial sub-surface according to the light distribution curve comprises the following steps:

7. The method of claim 5, wherein, if there is overlap between each primary initial sub-surface, determining the initial luminous flux of each primary initial sub-surface according to the light distribution curve and the protruding part of each primary initial sub-surface. The method of combining the light-out surface, the virtual focal surface, the lens bottom surface and the lens side wall of the light-supplement lens in spatial relationship to generate the light-supplement lens comprises the following steps:

8. The method of claim 1, wherein, adding an auxiliary surface according to the spatial relationship between the light-out surface and the virtual focal surface of the light-supplement lens, and generating the light-supplement lens according to the light-out surface, the virtual focal surface and the auxiliary surface; wherein the auxiliary surface comprises the lens side wall and the lens bottom surface of the light-supplement lens. ​ 9. The method of claim 1, wherein, The design process of the virtual focal surface comprises: determining the virtual focal point position and the initial value of the first point of the virtual focal surface; the first light ray direction is unchanged, and the tangent of the first point is obtained; the intersection of the second light ray and the tangent of the first point is obtained to obtain the second point; the second light ray exit direction is determined according to the line connecting the second point and the virtual focal point; the tangent of the second point is determined according to the second light ray exit and incident direction; the virtual focal surface is generated through a loop.

10. A light supplementing lens obtained by a design method based on the light supplementing lens according to any one of claims 1 to 9. Comprise: lens bottom surface, virtual focal surface, light exit surface and lens side wall; the light exit surface is spliced by each sub-surface; the lens bottom surface and the virtual focal surface are connected, and the lens side wall is connected with the light exit surface and the lens bottom surface respectively; the virtual focal surface virtually converts the light emitted by the light source into light emitted by a virtual focal point, wherein the virtual focal point has a smaller light emitting angle than the light source; the final light spot area is the superposition of the illumination distribution of each sub-surface; the final light spot area matches the lens field of view angle; the illumination distribution of the light exit surface matches the preset distribution of the lens.

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