CN111025633A - Lens design method and device based on odd polynomial and storage medium - Google Patents
Lens design method and device based on odd polynomial and storage medium Download PDFInfo
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Abstract
The invention discloses a lens design method, a device and a storage medium based on odd polynomial, wherein the method comprises the steps of firstly obtaining lens data of a lens designed based on an aspheric equation, then carrying out primary optimization on each optical surface of the lens based on the odd polynomial equation, and controlling the absolute value of the curvature radius of each optical surface to be less than or equal to 9mm and the absolute value of the coefficient of a quadratic curve to be less than 50 during optimization. And after the primary optimization, adjusting by taking a 3 rd order monomial coefficient in an odd polynomial equation of each optical surface as a variable. And finally, adjusting other odd-order polynomial coefficients except the 3-order polynomial coefficient to optimize each optical surface. Compared with the prior art, the lens is further optimized by using the odd polynomial, so that the lens resolution level can be improved.
Description
Technical Field
The invention relates to the field of lens design, in particular to a lens design method and device based on odd polynomial.
Background
The existing lens design is designed and optimized based on an aspheric equation, wherein the expression of the aspheric equation is as follows:
in the above formula, z is a rise in the paraxial direction, C is a curvature radius, k is a conic coefficient, z is a spherical equation when k is 0 and a, B, C, D, E, F, G, H, J are simultaneously zero, and z is a conic equation when k is not 0 and a, B, C, D, E, F, G, H, J are simultaneously zero.
However, the lens designed based on the aspheric equation has an optical system MTF (adjustment transfer function) that is not high enough at high spatial frequencies, a defocus curve that is poor, and a resolution level that is low.
Disclosure of Invention
The embodiment of the invention provides a lens design method and device of odd polynomial, which can improve the resolution level of a lens.
An embodiment of the present invention provides a lens design method based on an odd polynomial, including: acquiring lens data of a lens designed based on an aspheric equation; the lens comprises a plurality of lenses, wherein each lens comprises two optical surfaces;
performing primary optimization on each optical surface through an odd polynomial equation according to the lens data to generate equation parameters of the odd polynomial equation corresponding to each optical surface and a first MTF curve graph corresponding to each optical surface; wherein the equation parameters include: curvature radius, quadratic curve coefficient and each order of monomial coefficient of the odd polynomial equation; when the optical surfaces are optimized for the first time, the absolute value of the curvature radius is controlled to be less than or equal to 9mm, and the absolute value of the coefficient of the quadratic curve is controlled to be less than 50;
adjusting 3-order polynomial coefficients in each odd polynomial equation, controlling parameters of other equations in each odd polynomial equation to be unchanged, and optimizing each optical surface until MTF curves corresponding to each optical surface meet a first preset condition;
and adjusting other odd-order polynomial coefficients except the 3-order polynomial coefficient in each odd-order polynomial equation, optimizing each optical surface, and outputting equation parameters corresponding to each optimized optical surface so that a manufacturer can manufacture lenses according to the output equation parameters corresponding to each optical surface and assemble the lenses.
Further, when each optical surface is optimized for the first time, a monomial with the order of more than 20 in each odd polynomial equation is removed.
Further, the adjusting of the 3 rd order polynomial coefficient in each odd polynomial equation, and the controlling of the remaining equation parameters in each odd polynomial equation are unchanged, optimizes each optical surface, specifically includes:
controlling other equation parameters in each odd polynomial equation to be unchanged, adjusting 3-order polynomial coefficients of each odd polynomial equation according to a first numerical value adjusting direction and a preset numerical value, and generating a second MTF curve graph of each adjusted optical surface;
comparing the first MTF graph with a second MTF graph;
if the MTF value of the first MTF curve graph of each optical surface at the focus position is larger than that of the second MTF curve graph of each optical surface, adjusting the 3-order monomial coefficient of each odd-order polynomial equation according to the preset numerical value and the adjusting direction of the second numerical value;
if the MTF value of the first MTF curve graph of each optical surface at the focus position is smaller than the second MTF curve graph of each optical surface, continuously adjusting the 3-order polynomial coefficient of each odd-order polynomial equation according to the preset value and the first value adjusting direction; wherein the second numerical adjustment direction is opposite the first numerical adjustment direction.
On the basis of the above method item embodiments, the present invention correspondingly provides apparatus item embodiments;
the invention provides a lens design device based on odd polynomial, which comprises a data acquisition module, a first optimization module, a second optimization module and a third optimization module, wherein the data acquisition module is used for acquiring data;
the data acquisition module is used for acquiring lens data of a lens designed based on an aspheric equation; the lens comprises a plurality of lenses, wherein each lens comprises two optical surfaces;
the first optimization module is used for performing primary optimization on each optical surface through an odd polynomial equation according to the lens data to generate equation parameters of the odd polynomial equation corresponding to each optical surface and a first MTF curve graph corresponding to each optical surface; wherein the equation parameters include: curvature radius, quadratic curve coefficient and each order of monomial coefficient of the odd polynomial equation; when the optical surfaces are optimized for the first time, the absolute value of the curvature radius is controlled to be less than or equal to 9mm, and the absolute value of the coefficient of the quadratic curve is controlled to be less than 50;
the second optimization module is used for adjusting 3-order polynomial coefficients in each odd polynomial equation, controlling other equation parameters in each odd polynomial equation to be unchanged, and optimizing each optical surface until the MTF curve corresponding to each optical surface meets a first preset condition;
the third optimization module is configured to adjust other odd-order polynomial coefficients except for the 3-order polynomial coefficient in each odd-order polynomial equation, optimize each optical surface, and output equation parameters corresponding to each optimized optical surface, so that a manufacturer manufactures lenses according to the output equation parameters corresponding to each optical surface and assembles the lenses.
On the basis of the above embodiment of the method, the present invention provides another embodiment;
another embodiment of the present invention provides a storage medium, where the storage medium includes a stored computer program, and when the computer program runs, a device in which the storage medium is located is controlled to execute the lens design method based on odd polynomial according to the above embodiment of the present invention.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a lens design method, a device and a storage medium based on an odd polynomial, wherein the method comprises the steps of firstly obtaining lens data of a lens designed based on an aspheric equation, then carrying out primary optimization on each optical surface of the lens based on the odd polynomial equation, and controlling the absolute value of the curvature radius of each optical surface to be less than or equal to 9mm and the absolute value of a conic coefficient to be less than 50 during optimization, because the reason that the absolute value of the curvature radius is more than 9mm, the existing equipment cannot accurately measure the geometric eccentricity of the existing equipment. Since geometric eccentricity is an important element of high-precision lens quality control, the absolute value of the radius of curvature is 9mm or less. In addition, when the absolute value of the coefficient k of the quadratic curve is too large, the convergence of the optimization function in the optical design software is seriously disturbed, and therefore, the control is required to be within 50. And after the primary optimization, adjusting by taking a 3-order monomial coefficient in an odd polynomial equation of each optical surface as a variable. Because the MTF curve graph is greatly changed due to the variation of the medium-order 3 polynomial coefficients, it is necessary to determine the 3-order polynomial coefficient values in the odd-order polynomial equation to make the structural shape and light of each lens substantially oriented, and finally adjust the other odd-order polynomial coefficients except the 3-order polynomial coefficients to optimize each optical surface. Compared with the prior art, the lens is further optimized by using the odd polynomial, so that the resolution level of the lens can be improved.
Drawings
Fig. 1 is a schematic flowchart of a lens design method based on odd-order polynomial according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a lens design apparatus based on an odd polynomial according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a lens design method based on an odd polynomial, including:
s101, acquiring lens data of a lens designed based on an aspheric equation; wherein the lens comprises a plurality of lenses, each lens comprises two optical surfaces
Step S102, performing primary optimization on each optical surface through an odd polynomial equation according to the lens data to generate equation parameters of the odd polynomial equation corresponding to each optical surface and a first MTF curve graph corresponding to each optical surface; wherein the equation parameters include: curvature radius, quadratic curve coefficient and each order of monomial coefficient of the odd polynomial equation; when the optical surfaces are optimized for the first time, the absolute value of the curvature radius is controlled to be less than or equal to 9mm, and the absolute value of the coefficient of the quadratic curve is controlled to be less than 50;
step S103: adjusting 3-order polynomial coefficients in each odd polynomial equation, controlling parameters of other equations in each odd polynomial equation to be unchanged, and optimizing each optical surface until MTF curves corresponding to each optical surface meet a first preset condition;
and S104, adjusting other odd-order polynomial coefficients except the 3-order polynomial coefficient in each odd-order polynomial equation, optimizing each optical surface, and outputting equation parameters corresponding to each optimized optical surface, so that a manufacturer can manufacture lenses according to the output equation parameters corresponding to each optical surface and assemble the lenses.
In step S101, a lens is designed based on an aspheric equation by using existing optical design software, such as zemax or Code V, according to the user' S requirement data, and lens data of the lens obtained based on the aspheric equation is generated. Preferred user demand data includes: model Feature (CCD size, pixel size), EFL (effective focal length), Max image circle (maximum imaging circle size), Lens Constr (structure), fov (d) (field angle) Relative illumination (peripheral light), cra (Max) (maximum principal light angle), ttl (bartop to image) (total length), BFL (optical back focus), FBL (mechanical back focus), IR Cut Filter (IR slice size), Lens Dimension (Lens outline size) all or part of the above user demand data are input to the existing optical design software, or Code V, a plurality of optical system models are automatically generated, and then an optical system Model meeting the conditions is used as a Model for subsequent optimization, where the mentioned meeting conditions means that the data values of each item of Lens data respectively reach the optical Model of a preset value, and the corresponding Lens data is obtained, the lens data of the lens designed based on the aspherical equation according to the present invention is described above. The lens data here refers to the lens data of the optical system after the optical system is generated according to the user demand data by calling the existing optical software, such as zemax, and the specific data items include any one or a combination of the following items: model Feature (CCD size, pixel size), EFL (effective focal length), Max Image Circle (maximum imaging Circle size), Lens Constr (structure), fov (d) (field angle) Relative illumination (peripheral light), cra (Max) (maximum principal light angle), ttl (bartop to Image) (total length), BFL (optical back focus), FBL (mechanical back focus), IR Cut Filter (IR sheet size), Lens Dimension (Lens outline size). It should be noted that, according to the data required by the user, optimization is performed based on the aspheric equation to generate lens data of the lens based on the aspheric equation, which can be implemented by the existing optical design software such as zemax, and details are not repeated herein for the existing technology.
For step S102, first, an odd polynomial equation is described, the mathematical expression of which is as follows:
z is a sagittal height in the paraxial direction, c is a curvature radius, k is a conic coefficient, AR1, AR2, AR3, AR4, AR5, AR6, AR7, AR8 AR9, AR10, AR11, AR12, AR13, AR14, AR15, AR16, AR17, AR18, AR19, AR21, AR20, AR21, AR22, AR23, AR24, AR25, AR26, AR27, AR28, AR29, AR30, and a coefficient of each order monomial when it is an odd-order polynomial. AR1 and AR2 in the specification are 0;
since the odd polynomial is defined in the existing optical software Code V, in step S102, the absolute value of the curvature radius is controlled to be 9mm or less, and the absolute value of the coefficient of the quadratic curve is controlled to be less than 50, based on the lens data obtained in step S101, thenThen, calling the existing Code V, performing primary optimization on each optical surface of the lens based on the odd polynomial (the Code V is provided with an optimization function which can be optimized to be the existing one), and generating equation parameters of the odd polynomial equation corresponding to each optical surface, wherein the equation parameters comprise a curvature radius C, a quadratic curve coefficient K and coefficients of each order of polynomial, namely: values of AR3, AR4, AR5, AR6, AR7, AR8 AR9, AR10, AR11, AR12, AR13, AR14, AR15, AR16, AR17, AR18, AR19, AR21, AR20,; and the MTF curve corresponding to each optical surface (i.e. the first MTF curve) may not be able to accurately measure the geometric eccentricity of the existing apparatus due to the absolute value of the curvature radius being greater than 9 mm. Geometric eccentricity is an important factor for high-precision lens quality control, so that the absolute value of the curvature radius is less than or equal to 9 mm. In addition, when the absolute value of the coefficient k of the quadratic curve is too large, it will interfere with the convergence of the optimization function in the optical design software, and therefore it needs to be controlled within 50. Preferably, in the first optimization of each optical surface, a monomial with an order of 20 or more in each odd polynomial equation is removed. And generating an odd-order polynomial time equation corresponding to each optical surface, except for AR21r21、AR22r22、AR23r23、AR24r24、 AR25r25、AR26r26、AR27r27、AR28r28、AR29r29、AR30r30The reason is that the existing ultra-precision lathe (diamond single point lathe) can support the mathematical expression of odd polynomial, but only supports the high-order term as 20-order term. If more than 20 parameters are included, the lens cannot be processed and produced by the existing instrument.
For step S103, since the coefficient of the 3 rd order polynomial, that is, the above AR3 has a large influence on the optical surface, and once the 3 rd order polynomial coefficient changes, the corresponding MTF curve graph of each optical surface also has a large change, the 3 rd order polynomial coefficient needs to be adjusted first, and the adjustment method is to control the remaining equation parameters in the odd polynomial equation to be unchanged, and optimize each optical surface until the MTF curve graph corresponding to each optical surface meets the first preset condition; the first preset condition means that the MTF value of the MTF graph at the focus position reaches the maximum value obtained under the condition of only adjusting a 3-order polynomial;
specifically, in a preferred embodiment, the optimizing each optical surface by integrating the 3 rd order polynomial coefficient in each odd polynomial equation and controlling the remaining equation parameters in each odd polynomial equation to be unchanged includes:
controlling other equation parameters in each odd polynomial equation to be unchanged, adjusting 3-order polynomial coefficients of each odd polynomial equation according to a first numerical value adjusting direction and a preset numerical value, and generating a second MTF curve graph of each adjusted optical surface;
comparing the first MTF graph with a second MTF graph;
if the MTF value of the first MTF curve graph of each optical surface at the focus position is larger than that of the second MTF curve graph of each optical surface, adjusting the 3-order monomial coefficient of each odd-order polynomial equation according to the preset numerical value and the adjusting direction of the second numerical value;
if the MTF value of the first MTF curve graph of each optical surface at the focus position is smaller than the second MTF curve graph of each optical surface, continuously adjusting the 3-order polynomial coefficient of each odd-order polynomial equation according to the preset value and the first value adjusting direction; wherein the second numerical adjustment direction is opposite the first numerical adjustment direction.
The first numerical adjustment direction and the second numerical adjustment direction may be a direction in which the parameter value increases or a direction in which the parameter value decreases; the two numerical adjustment directions are opposite, if the first numerical adjustment direction is the direction of increasing the parameter value, the second numerical adjustment direction is the direction of decreasing the parameter value; if the first numerical adjustment direction is the direction of decreasing parameter value, then the second numerical adjustment direction is the direction of increasing parameter value.
An example of optical surface conditioning is illustrated below: assuming that the preset value is a, the first value adjustment direction is a direction in which the parameter value increases, and the second value adjustment direction is a direction in which the parameter value decreases, when the adjustment is started, the 3-order polynomial coefficient of an optical surface is increased by a, then a graph (a second MTF graph) is generated, the second MTF graph is compared with the first MTF graph obtained after the optical surface is primarily optimized in step S102, if the MTF value of the first MTF graph at the focus position is greater than the second MTF graph, it is indicated that the quality of the optical surface is poor, at this time, the adjustment needs to be performed in the opposite direction, that is, the adjustment direction is along the second value, the 3-order polynomial coefficient is decreased by a, then the second MTF graph is generated, and then the adjustment direction is compared with the first MTF graph; if the MTF value of the first MTF graph at the focus position is smaller than that of the second MTF graph, the quality of the optical surface is improved, the adjustment is continued along the first numerical value adjustment direction, namely the 3-order polynomial coefficient is increased by 2A, and then the comparison is continued; and finally, when the MTF value of the MTF curve graph corresponding to the optical surface at the focus position reaches a first preset value, or the MTF value of the MTF curve graph at the focus position reaches the maximum value under the condition of only adjusting the 3-order polynomial coefficient, stopping adjusting, and determining the adjusted 3-order polynomial coefficient.
For step S104, after confirming 3-order polynomial coefficients, namely AR3, keeping 3-order polynomial coefficients, curvature radius, quadratic curve coefficients, and even-order polynomial coefficients (AR4, AR6, AR8, AR10, A12, AR14, AR16, AR18, and AR20) unchanged, adjusting the remaining odd-order polynomial coefficients (AR5, AR7, AR9, AR11, A13, AR15, AR17, and AR19) one by one, adjusting the remaining odd-order polynomial coefficients without sequential components, adjusting the manner of each of the remaining odd-order polynomial coefficients similar to the manner of 3-order unidirectional adjustment in step S103, comparing the MTF generated after each adjustment with the MTF of the optical surface of the previous time, continuing to adjust in the same value direction if the effect is better, adjusting in the opposite direction if the effect is worse, until the MTF reaches the maximum value of the focus parameter at the position of the curve, the next parameter is then adjusted.
And after the adjustment is finished, outputting the equation parameters corresponding to each optical surface so that a manufacturer can manufacture the lens according to the output equation parameters corresponding to each optical surface.
The following table shows the data comparison between a lens designed using an aspheric equation (original method) and a lens designed by the method provided in the embodiment of the present invention (present method).
From the above table, it can be seen that the working aperture F No. of the lens is raised from 1.88 to 1.82 by adopting the manner provided in this embodiment under the condition of ensuring that the structural size parameters of the lens are not changed and the performance parameters are not reduced. This improvement can increase the amount of light entering the lens by 7%. The method is a remarkable progress, and the market competitive advantage of the mobile phone camera is more remarkable under the trend of pursuing a large aperture and a high light input quantity. And the MTF (modulation transfer function) of the central resolution force at 110 lines per millimeter rises from 0.67 to 0.74. So that the resolution level of the lens center is significantly improved by 10%.
On the basis of the above method item embodiments, there are correspondingly provided apparatus item embodiments:
as shown in fig. 2, another embodiment of the present invention provides a lens design apparatus based on an odd polynomial, including a data obtaining module, a first optimizing module, a second optimizing module, and a third optimizing module;
the data acquisition module is used for acquiring lens data of a lens designed based on an aspheric equation; the lens comprises a plurality of lenses, wherein each lens comprises two optical surfaces;
the first optimization module is used for performing primary optimization on each optical surface through an odd polynomial equation according to the lens data to generate equation parameters of the odd polynomial equation corresponding to each optical surface and a first MTF curve graph corresponding to each optical surface; wherein the equation parameters include: curvature radius, quadratic curve coefficient and each order of monomial coefficient of the odd polynomial equation; when the optical surfaces are optimized for the first time, the absolute value of the curvature radius is controlled to be less than or equal to 9mm, and the absolute value of the coefficient of the quadratic curve is controlled to be less than 50;
the second optimization module is used for adjusting 3-order polynomial coefficients in each odd polynomial equation, controlling other equation parameters in each odd polynomial equation to be unchanged, and optimizing each optical surface until the MTF curve corresponding to each optical surface meets a first preset condition;
the third optimization module is configured to adjust other odd-order polynomial coefficients except for the 3-order polynomial coefficient in each odd-order polynomial equation, optimize each optical surface, and output equation parameters corresponding to each optimized optical surface, so that a manufacturer can manufacture a lens according to the output equation parameters corresponding to each optical surface and assemble the lens.
It is to be understood that the above embodiments of the apparatus items correspond to the embodiments of the method items of the present invention, and the lens design method based on the odd-order polynomial provided in any of the above embodiments of the method items of the present invention can be implemented.
It should be noted that the above-described device embodiments are merely illustrative, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort. The schematic diagram is merely an example of the odd polynomial based lens design apparatus and does not constitute a limitation of the odd polynomial based lens design apparatus, and may include more or less components than those shown, or combine some components, or different components.
On the basis of the method item embodiment, a storage medium item embodiment is correspondingly provided;
an embodiment of the present invention provides a storage medium, which includes stored calculation and program, where when the computer program runs, the storage medium is controlled to execute the lens design method based on odd polynomial according to any one of the method items in the present invention.
The above-mentioned storage medium is a computer-readable storage medium, and the lens apparatus based on the odd polynomial may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (5)
1. A lens design method based on odd polynomial is characterized by comprising the following steps:
acquiring lens data of a lens designed based on an aspheric equation; the lens comprises a plurality of lenses, wherein each lens comprises two optical surfaces;
performing primary optimization on each optical surface through an odd polynomial equation according to the lens data to generate equation parameters of the odd polynomial equation corresponding to each optical surface and a first MTF curve graph corresponding to each optical surface; wherein the equation parameters include: curvature radius, quadratic curve coefficient and each order of monomial coefficient of the odd polynomial equation; when the optical surfaces are optimized for the first time, the absolute value of the curvature radius is controlled to be less than or equal to 9mm, and the absolute value of the coefficient of the quadratic curve is controlled to be less than 50;
adjusting 3-order polynomial coefficients in each odd polynomial equation, controlling parameters of other equations in each odd polynomial equation to be unchanged, and optimizing each optical surface until MTF curves corresponding to each optical surface meet a first preset condition;
and adjusting other odd-order polynomial coefficients except the 3-order polynomial coefficient in each odd-order polynomial equation, optimizing each optical surface, and outputting equation parameters corresponding to each optimized optical surface so that a manufacturer can manufacture lenses according to the output equation parameters corresponding to each optical surface and assemble the lenses into the lens.
2. The odd polynomial based lens design method of claim 1, wherein in the first optimization of each of said optical surfaces, a monomial having an order of 20 or more in each odd polynomial equation is removed.
3. The lens design method according to claim 1, wherein the adjusting of the 3 rd order polynomial coefficient in each odd polynomial equation and the controlling of the remaining equation parameters in each odd polynomial equation are unchanged optimizes each optical surface, specifically comprising:
controlling other equation parameters in each odd polynomial equation to be unchanged, adjusting 3-order polynomial coefficients of each odd polynomial equation according to a first numerical value adjusting direction and a preset numerical value, and generating a second MTF curve graph of each adjusted optical surface;
comparing the first MTF graph with a second MTF graph;
if the MTF value of the first MTF curve graph of each optical surface at the focus position is larger than that of the second MTF curve graph of each optical surface, adjusting the 3-order monomial coefficient of each odd-order polynomial equation according to the preset numerical value and the adjusting direction of the second numerical value;
if the MTF value of the first MTF curve graph of each optical surface at the focus position is smaller than the second MTF curve graph of each optical surface, continuously adjusting the 3-order polynomial coefficient of each odd-order polynomial equation according to the preset value and the first value adjusting direction; wherein the second numerical adjustment direction is opposite the first numerical adjustment direction.
4. A lens design device based on an odd polynomial is characterized by comprising a data acquisition module, a first optimization module, a second optimization module and a third optimization module;
the data acquisition module is used for acquiring lens data of a lens designed based on an aspheric equation; the lens comprises a plurality of lenses, wherein each lens comprises two optical surfaces;
the first optimization module is used for performing primary optimization on each optical surface through an odd polynomial equation according to the lens data to generate equation parameters of the odd polynomial equation corresponding to each optical surface and a first MTF curve graph corresponding to each optical surface; wherein the equation parameters include: curvature radius, quadratic curve coefficient and each order of monomial coefficient of the odd polynomial equation; when the optical surfaces are optimized for the first time, the absolute value of the curvature radius is controlled to be less than or equal to 9mm, and the absolute value of the coefficient of the quadratic curve is controlled to be less than 50;
the second optimization module is used for adjusting 3-order polynomial coefficients in each odd polynomial equation, controlling other equation parameters in each odd polynomial equation to be unchanged, and optimizing each optical surface until the MTF curve corresponding to each optical surface meets a first preset condition;
the third optimization module is configured to adjust other odd-order polynomial coefficients except for the 3-order polynomial coefficient in each odd-order polynomial equation, optimize each optical surface, and output equation parameters corresponding to each optimized optical surface, so that a manufacturer manufactures lenses according to the output equation parameters corresponding to each optical surface and assembles the lenses.
5. A storage medium comprising stored calculations and a program, wherein the computer program when executed controls an apparatus in which the storage medium is located to perform the lens design method based on odd-order polynomials of any of claims 1-3.
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Denomination of invention: A lens design method, device, and storage medium based on odd degree polynomials Granted publication date: 20210824 Pledgee: China Construction Bank Corporation Guangzhou Development Zone Branch Pledgor: GUANGZHOU JINGHE PHOTOELECTRIC TECHNOLOGY CO.,LTD. Registration number: Y2024980009887 |