Optical system design method, apparatus and storage medium for suppressing stray light

Abstract

The present application relates to a kind of optical system design method for suppressing stray light, equipment and storage medium, optical system design method includes the following steps: step S1, confirming stray light type;Step S2, according to stray light type, based on diaphragm field angle and relative aperture in meridian plane, the light path diagram of stray light is drawn;Step S3, according to the light path diagram of stray light drawn in step S2, obtain characteristic light and characteristic light path point;Step S4, using characteristic light and characteristic light path point, calculate stray light evaluation function;Step S5, according to stray light evaluation function optimization design optical system.The optical system design method for suppressing stray light of the present application can realize the optical design with the main advantages of super large field of view, extremely low or no stray light interference, clear and stable imaging.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of panoramic optical system, and particularly relates to an optical system design method for suppressing stray light, equipment and storage medium. BACKGROUND

[0002] With the development of computer-aided optical design and various special optical processing technologies, a large number of optical systems with non-traditional structures, non-traditional functions and performances are emerging. The panoramic annular optical system is an ultra-wide field optical system based on the principle of catadioptric optical system. Due to its special optical path structure design, compared with the existing ultra-wide field system, it has a more stable structure, higher design freedom, simpler processing technology and better optical performance. With the structural complexity of various optical systems, the restriction of stray light on the optical system cannot be ignored. Stray light refers to the light that does not propagate along the normal imaging light path in the optical system, which will produce additional and messy illumination on the image plane of the optical system, affecting the normal work of the optical system.

[0003] Traditional conventional control means are ineffective for stray light that only appears in some specific types of special optical systems. And at present, various stray light lacks a fast and accurate evaluation method, which is not convenient for fast iteration of optical design scheme. In recent years, the control of stray light for various special optical systems is generally carried out after the completion of optical design, and a large amount of analysis work is carried out to find possible positions to block the stray light path. This method is time-consuming and not convenient for fast iteration, and it is not universal.

[0004] For panoramic annular optical systems, people have also made some attempts to quickly control stray light in the design stage, but the method itself is not accurate and reliable, and the result is unpredictable, which is not conducive to quickly and low-cost iteration of panoramic annular optical systems with excellent optical performance.

[0005] At present, the analysis of stray light of optical system is generally carried out after the completion of the optical design stage, and a light-mechanical system model is established based on a large number of light tracing to judge the stray light condition of the current system. This method is independent of the optical design process, and cannot effectively communicate with each other. It needs to be controlled back and forth by artificial, which is low in efficiency and low in controllability, resulting in a long development cycle of special optical systems.

[0006] The more mature traditional stray light suppression methods include designing a light shield structure, improving the optical performance of optical coating, placing a stray light stop in the system, and arranging a light extinction thread or a light extinction coating on the structural part. These methods can play a certain role in traditional pure refractive lenses with small field of view, reducing the influence of stray light on the optical system. However, for panoramic annular optical systems with special structures, these methods cannot control the stray light formed in the panoramic head unit, and these stray lights have a serious impact on the imaging of the optical system. At present, there is a lack of effective and accurate real-time evaluation and suppression method for these stray lights.

[0007] In the prior art, the skilled person always tries to achieve stray light elimination design by managing the mathematical relationship of imaging light rays in the optical design stage. However, stray light and imaging light path do not share the same propagation path in most cases, so it is inaccurate and unreliable to describe stray light by using imaging light path. Moreover, the composition of stray light in panoramic annular optical systems is very complex, and this method is too specific and is not widely applicable to such systems.

[0008] In some technical literature, some methods of cutting off the propagation path of stray light by digging holes and grooves after the panoramic annular optical system is processed are also given. However, such stray light elimination methods belong to remedial measures after the optical system has been processed, and the effect is very limited and may not be implemented. Therefore, there is no systematic, comprehensive and effective analysis and solution for the stray light of panoramic annular optical systems. SUMMARY

[0009] In view of the above technical problems, the present application provides an optical system design method, device and storage medium for suppressing stray light, which aims at the following two points. First, in the optical design stage of the panoramic annular optical system, the stray light situation and risk of the current optical system are quickly and accurately evaluated, which facilitates iteration in the optical design stage, avoids a large amount of stray light analysis based on optical and mechanical system modeling and a large number of ray tracing, greatly shortens the research and development cycle of the optical system, and reduces the research and development cost. Second, only in the optical design stage of the panoramic annular optical system, several types of stray light generated in the panoramic annular head unit are completely suppressed or at least controlled to a controllable level by controlling a specific optimization function. This design method of simultaneous design and evaluation improves the automation degree of optimizing optical performance and speeds up the design efficiency of the product.

[0010] The technical solution for achieving the object of the present application is an optical system design method for suppressing stray light, comprising the following steps:

[0011] Step S1, confirming the type of stray light;

[0012] Step S2, according to the stray light type, based on the field angle of the diaphragm and the relative aperture in the meridional plane, draw the light path diagram of the stray light;

[0013] Step S3, according to the light path diagram of the stray light drawn in step S2, obtain the characteristic light and the characteristic light path point;

[0014] Step S4, calculate the stray light evaluation function by using the characteristic light and the characteristic light path point;

[0015] Step S5, optimize the design of the optical system according to the stray light evaluation function.

[0016] According to one aspect of the present application, in the step S1, the stray light modeling analysis simulation is performed on the panoramic annular optical system, and the stray light type to be analyzed and suppressed is determined.

[0017] According to one aspect of the present application, in the step S2, for the stray light type confirmed in the step S1, based on at least three field angles θ of the diaphragm and three relative apertures ρ in the meridional plane, the light is traced back to the entrance surface of the panoramic annular optical system along the path of the stray light from the position of the diaphragm after the panoramic annular head unit, and the light path is combined to draw the light path diagram.

[0018] According to one aspect of the present application, in the step S3, the characteristic light includes upper light UR and lower light LR.

[0019] Step S31, determine the upper light path point and mark it as URW1, URW2, …, the upper light path point is the lens edge point closest to the light of the maximum diaphragm field angle on each surface in the light path diagram, which passes through the light path and whose landing point is closest to the edge.

[0020] Step S32, determine the lower light path point and mark it as LRW1, LRW2, …, the lower light path point is the lens edge point closest to the light of the minimum diaphragm field angle on each surface in the light path diagram, which passes through the light path and whose landing point is closest to the edge.

[0021] Step S33, determine the characteristic light by using the path point of the characteristic light.

[0022] According to one aspect of the present application, in the step S33, it includes:

[0023] Step S331, determine the relative aperture and the diaphragm incidence angle of the upper light, the relative aperture ρ UR of the upper light is the relative aperture of the light farthest from the corresponding upper light path point, and the diaphragm incidence angle θ URthe minimum stop entrance angle of the light ray with ρ UR the minimum stop entrance angle of the light ray with ρ

[0024] Step S332, determining the relative aperture and the stop entrance angle of the lower light ray, the relative aperture ρ LR of the light ray farthest from the corresponding lower light ray path point, and the stop entrance angle θ LR of the lower light ray. LR the maximum stop entrance angle of the light ray with ρ URW the maximum stop entrance angle of the light ray with ρ

[0025] According to one aspect of the present application, further comprising:

[0026] Using the distance between the landing point of the trial light ray on any optical surface of the panoramic annular optical system head structure containing a certain characteristic light ray path point and the vertical axis of the corresponding characteristic light ray path point to identify whether the trial light ray is a characteristic light ray,

[0027] that is, using the trial light ray to iteratively find the characteristic light ray, and the vertical axis distance between the landing point of the trial light ray and each path point on the surface is recorded as:

[0028]

[0029] wherein I URW is an index for evaluating whether the trial light ray can be considered as an upper light ray, I LRW is an index for evaluating whether the trial light ray can be considered as a lower light ray, y URW is the vertical axis coordinate of the upper light ray path point, y LRW is the vertical axis coordinate of the lower light ray path point, y 试探光线，URW所在表面 is the vertical axis coordinate of the landing point of the trial light ray on the optical surface of the corresponding upper light ray path point, and y 试探光线，LRW所在表面 is the vertical axis coordinate of the landing point of the trial light ray on the optical surface of the corresponding lower light ray path point.

[0030] In the above formula, according to the selection of the specific stray light type and path point, the signs of I URW and I LRW are defined as: positive if the trial light ray falls within the effective aperture of the surface, and negative if it falls outside the effective aperture.

[0031] When I URW = 0, the trial light ray is an upper light ray, and corresponds to a stop entrance angle θ When I LRW = 0, the trial light ray is a lower light ray, and corresponds to a stop entrance angle θ

[0032] The effective upper light ray and the effective lower light ray are determined, and the diaphragm field angles of the effective upper light ray and the effective lower light ray satisfy:

[0033]

[0034] Wherein, θ UR is the diaphragm field angle of the effective upper light ray, θ LR is the diaphragm field angle of the effective lower light ray, is the diaphragm field angle of the trial light ray passing through the mth upper light ray path point, is the diaphragm field angle of the trial light ray passing through the nth lower light ray path point.

[0035] According to one aspect of the present application, in the step S4, specifically comprising:

[0036] Step S41, constructing an upper evaluation function C UR The upper evaluation function is the vertical distance between the falling point of the upper light ray on the surface of each lower light ray path point and the lower light ray path point, and the formula is:

[0037] |C URn |=|y UR，LRWn所在表面 -y LRWn |,

[0038] Wherein, C URn is the upper evaluation function based on the nth lower light ray path point, y UR，LRWn所在表面 is the vertical coordinate of the falling point of the effective upper light ray on the surface of the nth lower light ray path point, y LRWn is the vertical coordinate of the nth lower light ray path point; according to the specific stray light type and the selection of the path point, the sign of C URn is defined as: positive if the upper light ray falls within the effective aperture of the surface, and negative if it falls outside the effective aperture;

[0039] Step S42, constructing a lower evaluation function C LR The lower evaluation function is the vertical distance between the falling point of the lower light ray on the surface of each upper light ray path point and the upper light ray path point, and the formula is:

[0040] |C LRm |=|y LR，URWm所在表面 -y URWm |,

[0041] Wherein, C LRm is the lower evaluation function based on the mth upper light ray path point, y LR，URWm所在表面 is the vertical coordinate of the falling point of the effective lower light ray on the surface of the mth upper light ray path point, y URWmThe vertical axis coordinate of the mth upper light path point; C is defined according to the specific stray light type and the selection of the path point LRm The symbol is: positive if the lower light falls within the surface effective aperture, and negative if the lower light falls outside the effective aperture;

[0042] In step S43, the stray light evaluation function C is calculated using the upper evaluation function and the lower evaluation function, and the total evaluation function is the larger of the minimum upper evaluation function and the minimum lower evaluation function, and the formula is:

[0043] C = max(min(C URn ), min(C LRm )).

[0044] According to one aspect of the present application, in the step S5, it comprises:

[0045] The stray light evaluation function C is input into the optical design software, and by adding an optimization constraint to make C less than a preset threshold, the preset threshold is less than or equal to 0.

[0046] According to one aspect of the present application, an electronic device is provided, comprising: one or more processors, one or more memories, and one or more computer programs; wherein the processor is connected with the memory, and the one or more computer programs are stored in the memory; when the electronic device is running, the processor executes the one or more computer programs stored in the memory, so that the electronic device executes the optical system design method for suppressing stray light according to any one of the above technical solutions.

[0047] According to one aspect of the present application, a computer readable storage medium is provided for storing computer instructions, which are executed by a processor to implement the optical system design method for suppressing stray light according to any one of the above technical solutions.

[0048] According to the concept of the present application, a stray light suppression optical system design method, device and storage medium are provided, by determining the type of stray light that needs to be analyzed and suppressed, according to the stray light type, based on the relative aperture in the field angle and the meridian plane of the diaphragm, the optical path diagram of the stray light is drawn, and then the characteristic light and the characteristic light path point are obtained by using the optical path diagram, and then the stray light evaluation function is obtained, and the optical system is optimized according to the stray light evaluation function. The stray light suppression optical system design method described above can quickly and accurately evaluate the stray light condition and risk of the current optical system in the panoramic annular optical system optical design stage, facilitate iteration in the optical design stage, avoid a large amount of stray light analysis work based on optical mechanical system modeling and a large number of ray tracing, greatly shorten the research and development cycle of the optical system, reduce the research and development cost, and further, in the panoramic annular optical system optical design stage, by controlling a specific optimization function, several types of stray light generated in the head unit of the panoramic annular optical system are completely suppressed, or at least reach a controllable risk level, the design and evaluation can be carried out at the same time, the automation degree of optimizing the optical performance is improved, and the design efficiency of the product is accelerated.

[0049] Meanwhile, the stray light suppression optical system design method of the present application has universality and can be widely applied to the stray light suppression in the catadioptric optical system with the minimum and maximum field angle range. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 Schematic representation of a certain type of stray light path commonly appearing in the panoramic annular optical system;

[0051] Figure 2 Schematic representation of the result of stray light analysis simulation of the panoramic annular lens with multiple stray light according to an embodiment of the present application;

[0052] Figure 3 Schematic representation of the optical path structure distribution diagram according to an embodiment of the present application;

[0053] Figure 4 Schematic representation of the characteristic light path point identified according to the optical path structure distribution diagram according to an embodiment of the present application; Figure 3

[0054] Figure 5 Schematic representation of the optical path diagram for calculating the stray light evaluation function by using the characteristic light according to an embodiment of the present application;

[0055] Figure 6 Schematic representation of the flowchart of the stray light suppression optical system design method according to an embodiment of the present application. DETAILED DESCRIPTION

[0056] ​In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0057] The present application will be described in detail below in conjunction with the drawings and specific embodiments. The embodiments cannot be exhaustively described here, but the embodiments of the present application are not limited to the following embodiments.

[0058] As shown in the drawings, Figures 1 to 6 A method for designing an optical system for suppressing stray light, comprising the following steps:

[0059] Step S1, confirming the type of stray light;

[0060] Step S2, according to the type of stray light, based on the field angle of the diaphragm and the relative aperture in the meridional plane, drawing the light path diagram of the stray light;

[0061] Step S3, according to the light path diagram of the stray light drawn in step S2, obtaining the characteristic light and the characteristic light path point;

[0062] Step S4, using the characteristic light and the characteristic light path point, calculating the stray light evaluation function;

[0063] Step S5, optimizing the design of the optical system according to the stray light evaluation function.

[0064] In this embodiment, by determining the type of stray light that needs to be analyzed and suppressed, according to the type of stray light, based on the field angle of the diaphragm and the relative aperture in the meridional plane, drawing the light path diagram of the stray light, then using the light path diagram to obtain the characteristic light and the characteristic light path point, and further obtaining the stray light evaluation function, and optimizing the design of the optical system according to the stray light evaluation function, the above method for designing an optical system for suppressing stray light can quickly and accurately evaluate the stray light situation and risk of the current optical system in the optical design stage of the panoramic annular optical system, facilitate iteration in the optical design stage, avoid a large amount of stray light analysis work based on optical and mechanical system modeling and a large number of ray tracing, greatly shorten the research and development cycle of the optical system, reduce the research and development cost, and further, in the optical design stage of the panoramic annular optical system, by controlling a specific optimization function, several types of stray light generated in the head unit of the panoramic annular optical system are completely suppressed, or at least reach a controllable risk level, which can realize simultaneous design and evaluation, improve the automation degree of optimizing optical performance, and speed up the design efficiency of the product.

[0065] In one embodiment of the present application, preferably, in the step S1, stray light modeling analysis simulation is performed on the panoramic annular optical system to determine the type of stray light that needs to be analyzed and suppressed.

[0066] In this embodiment, for an example of a certain type of optical system, such as a certain type of panoramic annular optical system containing stray light, by modeling simulation analysis of the system, the type of stray light that needs to be analyzed and suppressed can be determined, and the focus is to obtain the stray light path, and this step is used to understand the composition of the stray light and select one or more stray light paths that need to be controlled in a specific design, so for the same type of optical system, only one implementation is needed, and in subsequent analysis of the same type of optical system, the simulation analysis and selection can be used according to the composition of the stray light.

[0067] As shown in Figure 2 , the results of the analysis simulation of the panoramic annular lens containing multiple stray lights. The first row (a, b, c, d in the figure) is the image plane illuminance distribution formed by the optical system under different angles in the actual test, and multiple obvious stray light spots appear; the second row (e, f, g, h in the figure) is the image plane illuminance distribution obtained in the simulation, and the simulation results are in good agreement with the experimental results; the third row (i, j, k, l in the figure) is the light path causing the abnormal light spot; the stray light shown in the first column (a, e, i) and the fourth column (d, h, l) is caused by the splitting of light on the first incident surface of the panoramic head unit, the second column (b, f, j) is caused by the scattering of light on the structural part, and the third column (c, g, k) is caused by the reflection of light on the bonding surface of the panoramic head unit.

[0068] In one embodiment of the present application, preferably, in the step S2, based on at least three stop field angles θ and three relative apertures ρ in the meridian plane, the light path is traced back to the incident surface of the panoramic annular optical system from the stop position after the panoramic annular head unit along the path of the stray light, and the light path is combined and drawn.

[0069] In this embodiment, taking the fourth column in the 2 figure as an example, as shown in Figure 3 , S1 to S4 respectively represent different optical surfaces in the panoramic annular head unit. This schematic diagram is completed by tracing back 9 rays from the stop position along the path of the stray light propagation, and tracing back to the exit from S1. In the actual drawing process, the color of the light ray can represent different stop field angles, and the color depth of the light ray can represent different relative apertures, which facilitates the drawing and identification of each light ray.

[0070] As shown in Figure 4As shown, in one embodiment of the present application, preferably, in the step S3, the characteristic light rays are divided into upper light rays UR and lower light rays LR, including:

[0071] Step S31, determine the upper light ray path points and mark them as URW1, URW2, …, the upper light ray path points are the lens edge points on each surface closest to the edge of the falling point of the light path in the light path diagram and the light path passing through, and closest to the edge of the light ray with the maximum field angle of the stop;

[0072] Step S32, determine the lower light ray path points and mark them as LRW1, LRW2, …, the lower light ray path points are the lens edge points on each surface closest to the edge of the falling point of the light path in the light path diagram and the light path passing through, and closest to the edge of the light ray with the minimum field angle of the stop;

[0073] Step S33, determine the characteristic light rays using the path points of the characteristic light rays.

[0074] In this embodiment, the characteristic light ray path points are divided into upper light ray path points and lower light ray path points, both of which can exist in multiple, and the characteristic light ray path points are located on the edges of each lens of the optical system.

[0075] In one embodiment of the present application, preferably, in the step S33, including:

[0076] Step S331, determine the relative aperture and stop incidence angle of the upper light rays, the relative aperture of the upper light rays ρ UR is the relative aperture of the light ray farthest from the corresponding upper light ray path point, the stop incidence angle of the upper light rays θ UR is the minimum stop incidence angle that enables the light ray with ρ UR to pass through any upper light ray path point;

[0077] Step S332, determine the relative aperture and stop incidence angle of the lower light rays, the relative aperture of the lower light rays ρ LR is the relative aperture of the light ray farthest from the corresponding lower light ray path point, the stop incidence angle of the lower light rays θ LR is the maximum stop incidence angle that enables the light ray with ρ LR to pass through any lower light ray path point.

[0078] In one embodiment of the present application, preferably, further including:

[0079] Use the distance between the falling point of the trial light ray when passing through the head structure of the panoramic annular optical system and the vertical axis of the corresponding characteristic light ray path point to identify whether the trial light ray is a characteristic light ray,

[0080] That is, the characteristic light ray is found by using the trial light ray to iterate, and the distance between the landing point of the trial light ray and the normal of the surface at each path point is recorded as:

[0081]

[0082] Wherein, I URW is an index for evaluating whether the trial light ray can be considered as the upper light ray, I LRW is an index for evaluating whether the trial light ray can be considered as the lower light ray, y URW is the normal axis coordinate of the upper light ray path point, y LRW is the normal axis coordinate of the lower light ray path point, y 试探光线，URW所在表面 is the normal axis coordinate of the landing point of the trial light ray on the optical surface corresponding to the upper light ray path point, y 试探光线，LRW所在表面 is the normal axis coordinate of the landing point of the trial light ray on the optical surface corresponding to the lower light ray path point;

[0083] In the above formula, according to the specific stray light type and the selection of the path point, the signs of I URW and I LRW are defined as follows: positive if the trial light ray falls within the effective aperture of the surface, and negative if it falls outside the effective aperture;

[0084] When I URW = 0, the trial light ray is the upper light ray, and corresponds to an entrance angle of the diaphragm When I LRW = 0, the trial light ray is the lower light ray, and corresponds to an entrance angle of the diaphragm

[0085] The effective upper light ray and the effective lower light ray are determined, and the diaphragm field angles of the effective upper light ray and the effective lower light ray satisfy:

[0086]

[0087] Wherein, θ UR is the diaphragm field angle of the effective upper light ray, θ LR is the diaphragm field angle of the effective lower light ray, is the diaphragm field angle of the mthupper light ray path point so that the trial light ray passes through it, is the diaphragm field angle of the nthlower light ray path point so that the trial light ray passes through it.

[0088] In an embodiment of the present application, preferably, in the step S4, specifically comprises:

[0089] Step S41, constructing an upper evaluation function C URThe upper evaluation function is the distance between the falling point of the upper ray on the surface where each lower ray path point is located and the vertical axis of the lower ray path point, and the formula is:

[0090] |C URn |=|y UR，LRWn所在表面 -y LRWn |,

[0091] wherein C URn is the upper evaluation function based on the nth lower ray path point, y UR，LRWn所在表面 is the vertical axis coordinate of the falling point of the effective upper ray on the surface where the nth lower ray path point is located, and y LRWn is the vertical axis coordinate of the nth lower ray path point; according to the selection of the specific stray light type and the path point, the sign of C URn is defined as: positive if the upper ray falls within the surface effective aperture, and negative if the upper ray falls outside the effective aperture;

[0092] Step S42, constructing a lower evaluation function C LR The lower evaluation function is the distance between the falling point of the lower ray on the surface where each upper ray path point is located and the vertical axis of the upper ray path point, and the formula is:

[0093] |C LRm |=|y LR，URWm所在表面 -y URWm |,

[0094] wherein C LRm is the lower evaluation function based on the mth upper ray path point, y LR，URWm所在表面 is the vertical axis coordinate of the falling point of the effective lower ray on the surface where the mth upper ray path point is located, and y URWm is the vertical axis coordinate of the mth upper ray path point; according to the selection of the specific stray light type and the path point, the sign of C LRm is defined as: positive if the lower ray falls within the surface effective aperture, and negative if the lower ray falls outside the effective aperture;

[0095] Step S43, calculating a stray light evaluation function C by using the upper evaluation function and the lower evaluation function, and the total evaluation function is the larger one of the minimum upper evaluation function and the minimum lower evaluation function, and the formula is:

[0096] C = max(min(C URn ), min(C LRm )).

[0097] In this embodiment, the stray light evaluation function is divided into upper evaluation function, lower evaluation function and total evaluation function. There can be multiple upper and lower evaluation functions, and there is only one total evaluation function. When calculating the stray light evaluation function using the characteristic light, first, the minimum value of the upper light evaluation function and the minimum value of the lower evaluation function are calculated respectively. The distance between the two values is shown in formula (1) as follows: Figure 5 The rest of the upper and lower evaluation functions that are not minimum values are omitted. The total evaluation function is the larger value between the minimum upper evaluation function and the minimum lower evaluation function. When the value is positive, it proves that stray light exists in the current optical system. Otherwise, there is no stray light.

[0098] In one embodiment of the present application, preferably, in the step S5, the following is included:

[0099] The stray light evaluation function C is input into the optical design software, and an optimization constraint is added to make C less than a preset threshold value, which is less than or equal to 0.

[0100] In this embodiment, the value calculated by the stray light evaluation function is imported into the optical software as one of the optimization parameters of the optical system. The panoramic annular optical system is optimized by the optical system software. An optimization constraint is added to make C less than a preset threshold value, which is less than or equal to 0. The step S5 can be realized by using, but not limited to, built-in optimization function combination, self-defined optimization function, external program interface, etc. As shown in formula (2) as follows: Figure 5 The minimum upper and lower evaluation functions are both negative, and the larger one is the total evaluation function, which is also negative, proving that the stray light has been completely suppressed.

[0101] According to one aspect of the present application, an electronic device is provided, comprising one or more processors, one or more memories, and one or more computer programs; wherein the processor is connected with the memory, and the one or more computer programs are stored in the memory, and when the electronic device is running, the processor executes the one or more computer programs stored in the memory, so that the electronic device executes the optical system design method for suppressing stray light according to any one of the above technical solutions.

[0102] According to one aspect of the present application, a computer readable storage medium is provided for storing computer instructions, which are executed by a processor to implement the optical system design method for suppressing stray light according to any one of the above technical solutions.

[0103] In summary, the present application provides an optical system design method for suppressing stray light, equipment and storage medium, by determining the type of stray light that needs to be analyzed and suppressed, according to the type of stray light, based on the relative aperture of the field angle and the meridian plane of the diaphragm, the light path diagram of the stray light is drawn, and then the characteristic light and the characteristic light path point are obtained by using the light path diagram, and then the stray light evaluation function is obtained, and the optical system is optimized according to the stray light evaluation function. The above-mentioned optical system design method for suppressing stray light can quickly and accurately evaluate the stray light condition and risk of the current optical system in the panoramic annular optical system optical design stage, facilitate iteration in the optical design stage, avoid a large amount of stray light analysis work based on optical mechanical system modeling and a large amount of ray tracing, greatly shorten the research and development cycle of the optical system, reduce the research and development cost, and further, in the panoramic annular optical system optical design stage, by controlling a specific optimization function, several types of stray light generated in the panoramic annular head unit are completely suppressed, or at least reach a controllable risk level, the design and evaluation can be carried out at the same time, the automation degree of optimizing the optical performance is improved, and the design efficiency of the product is accelerated.

[0104] Meanwhile, the optical system design method for suppressing stray light of the present application has universality and can be widely applied to suppressing stray light with minimum and maximum field angle ranges existing in catadioptric optical systems.

[0105] In addition, it should be noted that the present application can be provided as a method, device or computer program product. Therefore, the embodiments of the present application can adopt a completely hardware embodiment, a completely software embodiment or an embodiment combining software and hardware aspects. Moreover, the embodiments of the present application can adopt the form of a computer program product implemented on one or more computer usable storage media containing computer usable program codes.

[0106] The embodiments of the present application are described with reference to flowcharts and / or block diagrams according to the method, terminal device (system) and computer program product of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, embedded processor or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device produce a machine that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The device that realizes the functions specified in one block or multiple blocks.

[0107] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the Figure 1 function specified in the flow or flows and / or blocks Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the function specified in the flow or flows and / or blocks Figure 1 function specified in the flow or flows and / or blocks Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the function specified in the flow or flows and / or blocks

[0108] It is also noted that the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0109] Finally, it should be noted that the above-mentioned preferred embodiments are merely intended to illustrate the present application and should not be interpreted in a limiting sense. Further modifications and improvements will occur to those skilled in the art upon a reading of the preceding description. It is therefore intended that the following claims shall cover all such modifications and improvements as fall within the true spirit and scope of the application. Accordingly, the appended claims are intended to embrace all such alterations and modifications as fall within the scope of the application.

Claims

1. A method of optical system design for suppressing stray light, characterized by, The method comprises the following steps: Step S1, confirming stray light types; Step S2, according to the stray light types, drawing a light path diagram of the stray light based on the field angle of the diaphragm and the relative aperture in the meridional plane; Step S3, obtaining characteristic light rays and characteristic light ray path points according to the light path diagram of the stray light drawn in step S2; Wherein, the distance between the landing point of the trial light ray when passing through any optical surface of the panoramic ring belt optical system head structure containing a certain characteristic light ray path point and the vertical axis of the corresponding characteristic light ray path point is used to identify whether the trial light ray is a characteristic light ray, That is, the characteristic light ray is found by iteration of the trial light ray, and the vertical axis distance between the landing point of the trial light ray and each path point on the surface is recorded as: wherein, I URW is an index for evaluating whether the probe ray can be considered as an upper ray, y LRW is an index for evaluating whether the probe ray can be considered as a lower ray, y URW is the vertical axis coordinate of the upper ray path point, y LRW is the vertical axis coordinate of the lower ray path point, y 试探光线，URW所在表面 is the vertical axis coordinate of the falling point of the probe ray on the optical surface where the corresponding upper ray path point is located, y 试探光线，LRW所在表面 is the vertical axis coordinate of the falling point of the probe ray on the optical surface where the corresponding lower ray path point is located. In the above equation, I is defined as positive if the probe ray falls within the surface effective aperture and negative if it falls outside the effective aperture, depending on the specific stray light type and the selection of the path point. URW and I LRW The sign of I is: positive if the probe ray falls within the surface effective aperture and negative if it falls outside the effective aperture. In I URW = 0, the tentative ray is an upper ray and corresponds to an entrance angle of the diaphragm In I LRW = 0, the tentative ray is a lower ray and corresponds to an entrance angle of the diaphragm Determine the effective upper light ray and the effective lower light ray, and the field angle of the diaphragm of the effective upper light ray and the effective lower light ray satisfies: where θ UR is the effective upper light ray's aperture field of view, θ LR is the effective lower light ray's aperture field of view, is the aperture field of view such that the probe light ray passes through the mthupper light ray path point, is the aperture field of view such that the probe light ray passes through the nthlower light ray path point; Step S4, calculating the stray light evaluation function by using the characteristic light rays and the characteristic light ray path points, specifically including: Step S41, constructing the upper evaluation function C UR The upper evaluation function is the distance between the falling point of the upper light ray on the surface where the lower light ray path point is located and the vertical axis of the lower light ray path point, and the formula is: |C URn |=|y UR,LRWn所在表面 -y LRWn |, where C URn is the upper evaluation function based on the nth lower ray path point, y UR,LRWn所在表面 is the normal coordinate of the effective upper ray landing point on the surface at the nth lower ray path point, y LRWn is the normal coordinate of the nth lower ray path point; the sign of C URn is defined as: positive if the upper ray lands within the surface effective aperture, negative if it lands outside the effective aperture; Step S42, constructing the lower evaluation function C LR The lower evaluation function is the distance between the foot point of the lower light ray on the surface where the upper light ray path point is located and the vertical axis of the upper light ray path point, and the formula is: |C LRm |=|y LR,URWm所在表面 -y URWm |, where C LRm is the lower evaluation function based on the mth upper ray path point, y LR,URWm所在表面 is the normal coordinate of the effective lower ray foot point on the surface where the mth upper ray path point lies, y URWm is the normal coordinate of the mth upper ray path point; C LRm is positive if the lower ray falls within the surface effective aperture and negative if it falls outside the effective aperture; Step S43, calculating the stray light evaluation function C by using the upper evaluation function and the lower evaluation function, and the total evaluation function is the larger value of the minimum upper evaluation function and the minimum lower evaluation function, and the formula is: C = max(min(C URn ), min(C LRm )); Step S5, optimizing the design of the optical system according to the stray light evaluation function.

2. The method of designing an optical system that suppresses stray light according to claim 1, wherein, In the step S1, the stray light modeling analysis simulation of the panoramic ring belt optical system is performed to determine the types of stray light that need to be analyzed and suppressed.

3. The method of designing an optical system that suppresses stray light according to claim 1, wherein In the step S2, for the stray light types confirmed in the step S1, based on at least three field angles θ of the diaphragm and three relative apertures ρ in the meridional plane, the rays are traced back to the entrance surface of the panoramic ring belt optical system from the diaphragm position after the panoramic ring belt head unit, and the light paths are combined to draw a light path diagram.

4. The method of designing an optical system that suppresses stray light according to claim 3, wherein In the step S3, the characteristic light rays include upper light rays UR and lower light rays LR, comprising: Step S31, determining the upper light ray path points and marking them as URW1, URW2, …, the upper light ray path points being the lens edge points closest to the rays with the maximum diaphragm field angle on each surface in the light path diagram, and the lens edge points closest to the rays with the minimum diaphragm field angle; Step S32, determining the lower light ray path points and marking them as LRW1, LRW2, …, the lower light ray path points being the lens edge points closest to the rays with the minimum diaphragm field angle on each surface in the light path diagram, and the lens edge points closest to the rays with the maximum diaphragm field angle; Step S33, determining the characteristic light rays by using the path points of the characteristic light rays.

5. The method of designing an optical system that suppresses stray light according to claim 4, wherein In the step S33, it comprises: Step S331: Determine the relative aperture and aperture stop incident angle of the upper light ray, wherein the relative aperture ρ of the upper light ray... UR The relative aperture of the ray farthest from the corresponding upper ray path point, and the incident angle θ of the upper ray. UR To make ρ UR The minimum angle of incidence of the light rays that can pass through any point on the upper light path; Step S332, determine the relative aperture and stop angle of incidence of the lower light rays, the relative aperture p LR is the relative aperture of the light ray that is farthest from the corresponding lower light ray path point, the stop angle of incidence of the lower light ray is LR is the maximum stop angle of incidence that enables the light ray with p LR to pass through any lower light ray path point.

6. The method of designing an optical system that suppresses stray light according to claim 5, wherein, In the step S5, it comprises: The stray light evaluation function C is input into the optical design software, and by adding optimization restrictions, C is less than a preset threshold, and the preset threshold is less than or equal to 0.

7. An electronic device, comprising: It comprises: One or more processors, one or more memories, and one or more computer programs; wherein the processors are connected with the memories, and the one or more computer programs are stored in the memories, and when the electronic device is running, the processor executes the one or more computer programs stored in the memories, so that the electronic device executes the method for designing an optical system for suppressing stray light according to any one of claims 1 to 6.

8. A computer-readable storage medium, characterized in that, A computer program product for storing computer instructions, which, when executed by a processor, implement the method for designing an optical system for suppressing stray light according to any one of claims 1 to 6.

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