Spectral attenuation consistency detection method and system for anti-blue-light film layer of lens

Abstract

The invention relates to the technical field of spectral attenuation detection, and discloses a spectral attenuation consistency detection method and system for a blue-light-proof film layer of a lens, and the method comprises the steps: carrying out the gradient operation of the blue-light-proof film layer of the blue-light-proof lens, and obtaining a local incident angle of the blue-light-proof film layer; collecting a refractive index-radial coordinate data set of the anti-blue-light film layer, and performing nonlinear fitting on the refractive index-radial coordinate data set to obtain a refractive index fitting function of the anti-blue-light film layer; calculating the total optical thickness of the anti-blue-light film layer through an optical thickness calculation formula based on the thickness matrixes of all levels in the anti-blue-light film layer and dependent variables of the refractive index fitting function; according to the invention, accurate detection and evaluation of the spectrum attenuation consistency of the anti-blue-light film layer can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of spectral attenuation detection, and particularly to a method and system for detecting the spectral attenuation consistency of a blue-light blocking film layer on a lens. Background Art

[0002] The traditional method for detecting the spectral attenuation of a blue-light blocking film layer uses an interference calculation model with a fixed incident angle and a standard refractive index, which is an optical analysis framework constructed based on idealized assumptions. This interference calculation model assumes that the incident light irradiates the film layer surface at a constant angle, without considering the local incident angle changes caused by the actual topography of the film layer, and uses a preset angle for calculation; at the same time, the film layer is regarded as a medium with a uniform refractive index, and a single refractive index value nominal for the material is used, ignoring the possible radial refractive index gradient or multi-layer structure differences in the film layer.

[0003] The prior art does not fully consider the gradient characteristics of the thickness distribution of the blue-light blocking film layer and the dynamic change of the refraction angle of the actual incident light due to the difference in the film layer surface topography, making it difficult to accurately describe the optical property differences in different regions of the film layer under non-orthogonal incident conditions, resulting in a large deviation between the theoretical calculation and the actual spectral attenuation characteristics, and making it difficult to effectively achieve the accurate detection and evaluation of the spectral attenuation consistency of the blue-light blocking film layer. Summary of the Invention

[0004] The present invention provides a method and system for detecting the spectral attenuation consistency of a blue-light blocking film layer on a lens, and its main purpose is to solve the problem that the prior art is difficult to effectively achieve the accurate detection and evaluation of the spectral attenuation consistency of the blue-light blocking film layer.

[0005] To achieve the above object, a method for detecting the spectral attenuation consistency of a blue-light blocking film layer on a lens provided by the present invention includes:

[0006] S1. Perform a gradient operation on the blue-light blocking film layer of the blue-light blocking lens to obtain the local incident angle of the blue-light blocking film layer;

[0007] S2. Collect the refractive index - radial coordinate data set of the blue-light blocking film layer, and perform non-linear fitting on the refractive index - radial coordinate data set to obtain the refractive index fitting function of the blue-light blocking film layer;

[0008] S3. Based on the thickness matrix of all levels in the blue-light blocking film layer and the dependent variable of the refractive index fitting function, calculate the total optical thickness of the blue-light blocking film layer through the optical thickness calculation formula;

[0009] S4. Calculate the equivalent refractive index of the blue-light blocking film layer according to the total optical thickness and the thickness matrix, and calculate the refraction angle of the blue-light blocking film layer through Snell's law according to the local incident angle and the equivalent refractive index;

[0010] S5. Perform thin-film interference calculation on the total optical thickness and the cosine value of the refraction angle to obtain the theoretical transmission center wavelength of the blue-light blocking film layer, and acquire the measured transmission center wavelength of the blue-light blocking film layer;

[0011] S6. Generate the deviation value between the measured transmission center wavelength and the theoretical transmission center wavelength, and determine the spectral attenuation consistency level of the blue-light blocking film layer based on the deviation value.

[0012] Optionally, the performing gradient operation on the blue-light blocking film layer of the blue-light blocking lens to obtain the local incident angle of the blue-light blocking film layer includes:

[0013] Acquire the topography data of the blue-light blocking film layer, and construct a three-dimensional height model of the blue-light blocking film layer according to the topography data;

[0014] Discretize the three-dimensional height model into two-dimensional grid data of the blue-light blocking film layer, and calculate the partial derivatives of the grid points in the two-dimensional grid data;

[0015] Form a gradient vector field of the three-dimensional height model according to the partial derivatives;

[0016] Determine the normal vectors of each surface point in the blue-light blocking film layer based on the gradient vector field;

[0017] Perform a vector dot product on the normal vector and the incident light direction vector of the surface point to obtain an included angle;

[0018] Determine the cosine value of the included angle as the local incident angle of the blue-light blocking film layer.

[0019] Optionally, the collecting the refractive index - radial coordinate data set of the blue-light blocking film layer includes:

[0020] Collect the effective refractive indices of multiple feature points on the blue-light blocking film layer;

[0021] Calculate the distance between the feature point and the center of the blue-light blocking lens according to the Euclidean distance formula to obtain the feature distance between the feature point and the center of the blue-light blocking lens;

[0022] Determine the radial coordinate of the feature point according to the feature distance;

[0023] Match the effective refractive index and the radial coordinate to obtain the refractive index - radial coordinate data pair of the feature point;

[0024] Collect the refractive index - radial coordinate data pairs into the refractive index - radial coordinate data set of the blue-light blocking film layer.

[0025] Optionally, the non-linear fitting of the refractive index-radial coordinate data set to obtain the refractive index fitting function of the blue light blocking film layer includes:

[0026] Select the fitting model of the refractive index fitting function;

[0027] Construct the fitting equation system of the fitting model;

[0028] Solve the fitting equation system to obtain the fitting parameters of the fitting model, where the fitting parameters include the refractive index at the lens center and the refractive index gradient coefficient;

[0029] Substitute the fitting parameters into the refractive index fitting function to obtain the refractive index value of the radial coordinate, where the refractive index fitting function is as follows:

[0030]

[0031] In the formula, represents the refractive index value when the radial coordinate is , represents the refractive index at the lens center, represents the refractive index gradient coefficient, represents the radial coordinate.

[0032] Optionally, based on the thickness matrix of all layers in the blue light blocking film layer and the dependent variable of the refractive index fitting function, the total optical thickness of the blue light blocking film layer is calculated through the optical thickness calculation formula, including:

[0033] Perform layer segmentation on the blue light blocking film layer to obtain multiple layers of the blue light blocking film layer;

[0034] Take the lens center of the blue light blocking lens as the center of the coordinate system and construct the plane coordinate system of the layer;

[0035] Collect the thickness values of each grid point in the layer at fixed intervals in the horizontal and vertical directions of the plane coordinate system;

[0036] Sort the thickness values according to the positions of the grid points to obtain the thickness matrix of the layer;

[0037] Map the dependent variable of the refractive index fitting function to the plane coordinate system to obtain the refractive index distribution value of the layer on the plane coordinate system;

[0038] Perform optical thickness calculation on the thickness matrix and the refractive index distribution value to obtain the total optical thickness of the blue light blocking film layer, where the optical thickness calculation formula is as follows:

[0039]

[0040] In the formula, represents the total optical thickness, represents the identifier of the said layer, represents the total number of the said layers, represents the refractive index distribution value of the represents the thickness matrix of the represents the two-dimensional coordinates of the said plane coordinate system.

[0041] Optionally, the calculation formula of the equivalent refractive index is as follows:

[0042]

[0043] In the formula, represents the said equivalent refractive index, represents the total optical thickness, represents the identifier of the said layer, represents the total number of the said layers, represents the thickness matrix of the represents the two-dimensional coordinates of the said plane coordinate system, represents the total thickness sum of all layers.

[0044] Specifically, Snell's law originally requires a medium with a uniform refractive index to be applicable, but in an optical coating layer, there are gradient changes (such as the non-uniformity of the refractive index distribution along the radial direction and the spatial fluctuation of the film thickness).

[0045] Generally speaking, the present invention solves this contradiction by establishing a "gradient - equivalent homogeneous" conversion mechanism: the equivalent refractive index is used as the core bridging variable and is calculated and generated based on the total optical thickness and the gradient information in the thickness matrix.

[0046] Specifically, these matrices record the thickness distribution of each layer of the film at different radial coordinate points and the refractive index gradient effect, which is equivalent to compressing a complex gradient structure into a single equivalent value.

[0047] Generally speaking, after incorporating the equivalent refractive index into Snell's law formula, the physical model originally for a uniform medium is extended to a gradient scenario, and at this time, the calculation result of the refraction angle already implicitly includes the dynamic response caused by the film gradient.

[0048] Generally speaking, although Snell's law does not explicitly involve gradient parameters in form, it indirectly integrates non-uniform characteristics through the gradient-derived quantity of the equivalent refractive index.

[0049] Generally speaking, this not only conforms to the principle of optical equivalent medium, but also realizes the seamless connection between the gradient change and the classical refraction law, solving the problem of optical path calculation deviation caused by ignoring the gradient in traditional methods.

[0050] Optionally, according to the local incident angle and the equivalent refractive index, calculating the refraction angle of the blue light blocking film layer through Snell's law, including:

[0051] Determining the refractive index of the incident medium on the incident side in the blue light blocking film layer;

[0052] Substituting the refractive index of the incident medium, the local incident angle, and the equivalent refractive index into Snell's law to calculate the refraction angle of the blue light blocking film layer, where Snell's law is as follows:

[0053]

[0054] In the formula, represents the refractive index of the incident medium, represents the sine value of the local incident angle, represents the local incident angle, represents the equivalent refractive index, represents the two-dimensional coordinates of the plane coordinate system, represents the sine value of the refraction angle, represents the refraction angle.

[0055] Optionally, performing thin film interference calculation on the total optical thickness and the cosine value of the refraction angle to obtain the theoretical transmission center wavelength of the blue light blocking film layer, including:

[0056] Multiplying the total optical thickness and the cosine value of the refraction angle to obtain the optical path difference of the blue light blocking film layer;

[0057] According to the integer multiple relationship between the optical path difference and the wavelength in thin film optical theory, constructing an interference condition formula for the optical path difference and the theoretical transmission center wavelength of the blue light blocking film layer;

[0058] Correcting the film layer refractive index in the interference condition formula to obtain the non-linear equation of the blue light blocking film layer;

[0059] Performing iterative solution on the non-linear equation to obtain the theoretical transmission center wavelength.

[0060] Specifically, the theoretical transmission center wavelength is the optical performance benchmark value after fusing the gradient characteristics of the film layer, and its essence is a quantitative reference standard generated by accurately modeling the physical characteristics of the film layer. The dynamic change of the refraction angle caused by ignoring the gradient distribution of the film layer thickness and the surface topography difference in the prior art (pointed out in the background art) cannot accurately reflect the optical differences in the film layer area.

[0061] Specifically, the local incident angle of the film layer is derived to capture the spatial difference of the incident light caused by the surface undulation.

[0062] Specifically, a gradient refractive index function is constructed by non - linear fitting to break through the assumption of uniform refractive index.

[0063] Specifically, the equivalent refractive index is calculated by combining the hierarchical thickness matrix, and the multi - layer non - uniform structure is equivalent to a homogeneous medium.

[0064] Specifically, finally, with the corrected optical path difference as the input, the optimized theoretical transmission center wavelength is obtained by solving through the thin - film interference theory.

[0065] Generally speaking, its core value lies in: providing a comparison reference for the measured transmission center wavelength and directly reflecting the degree of fit between the manufacturing process and the theoretical design.

[0066] Specifically, the smaller the deviation value, the more accurately the film layer manufacturing process reproduces the optical behavior of the theoretical model.

[0067] Generally speaking, it overcomes the theoretical deviation of the traditional fixed - incident - angle model and realizes the spatial refinement evaluation of the spectral attenuation consistency.

[0068] Generally speaking, the scientific significance of this parameter lies in that it integrates non - ideal factors such as gradient effect, dynamic refraction and multi - layer interference, and becomes the core index connecting theoretical design and actual product performance.

[0069] Optionally, generating the deviation value between the measured transmission center wavelength and the theoretical transmission center wavelength, and determining the spectral attenuation consistency level of the blue - light - blocking film layer based on the deviation value, includes:

[0070] Calculating the difference between the measured transmission center wavelength and the theoretical transmission center wavelength to obtain the deviation value ;

[0071] Comprehensively evaluating the material structure and manufacturing process error of the blue - light - blocking film layer to obtain the deviation threshold between the measured transmission center wavelength and the theoretical transmission center wavelength ;

[0072] Judging and in terms of magnitude:

[0073] When , it is determined that the spectral attenuation consistency level is unqualified;

[0074] When , it is determined that the spectral attenuation consistency level is qualified;

[0075] When If so, it is determined that the spectral attenuation consistency level is excellent.

[0076] To solve the above problems, the present invention also provides a spectral attenuation consistency detection system for the anti-blue light film layer of a lens. The system includes:

[0077] A local incident angle calculation module that performs a gradient operation on the anti-blue light film layer of the anti-blue light lens to obtain the local incident angle of the anti-blue light film layer;

[0078] A refractive index fitting function generation module that collects the refractive index - radial coordinate data set of the anti-blue light film layer and performs non-linear fitting on the refractive index - radial coordinate data set to obtain the refractive index fitting function of the anti-blue light film layer;

[0079] A total optical thickness calculation module that calculates the total optical thickness of the anti-blue light film layer based on the thickness matrix of all levels in the anti-blue light film layer and the dependent variable of the refractive index fitting function through the optical thickness calculation formula;

[0080] A refraction angle calculation module that calculates the equivalent refractive index of the anti-blue light film layer according to the total optical thickness and the thickness matrix, and calculates the refraction angle of the anti-blue light film layer according to the local incident angle and the equivalent refractive index through Snell's law;

[0081] A wavelength generation module that performs thin film interference calculation on the total optical thickness and the cosine value of the refraction angle to obtain the theoretical transmission center wavelength of the anti-blue light film layer, and obtains the measured transmission center wavelength of the anti-blue light film layer;

[0082] A judgment module that generates a deviation value between the measured transmission center wavelength and the theoretical transmission center wavelength, and determines the spectral attenuation consistency level of the anti-blue light film layer based on the deviation value.

[0083] Compared with the prior art, the present invention has the following beneficial effects:

[0084] 1. By performing a gradient operation on the anti-blue light film layer to construct a three-dimensional height model, calculating the angle between the normal vector of each surface point and the incident light direction vector, and obtaining the dynamically changing local incident angle, rather than using a fixed incident angle, so as to reflect the dynamic response of the refraction angle caused by the surface topography difference of the film layer;

[0085] 2. The present invention obtains a gradient refractive index fitting function by collecting the refractive index - radial coordinate data set of the film layer and performing non-linear fitting. Non-linear fitting can capture the gradient law of the refractive index with the radial coordinate, breaking the traditional assumption of uniform refractive index; at the same time, the thickness distribution of each level in the plane coordinate system is recorded through the thickness matrix, so that the calculation of the total optical thickness can reflect the cumulative effect of the refractive index and thickness at different positions and different levels;

[0086] 3. The present invention calculates the equivalent refractive index of the blue light blocking film layer based on the total optical thickness and the thickness matrix. The equivalent refractive index calculated in this way can equivalent a multi-layer non-uniform structure into a locally homogeneous medium. Combining with the dynamic local incident angle obtained through gradient operation, Snell's law is used to calculate the refraction angle in different regions. Finally, the refractive index wavelength correlation correction is introduced in the thin film interference calculation to achieve the accurate calculation of the optical path difference in each region and the theoretical transmission center wavelength under non-orthogonal incidence, so that the theoretical calculation can truly reflect the optical property differences in different regions of the film layer, thereby reducing the deviation between theory and measurement and realizing the accurate evaluation of the spectral attenuation consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] Figure 1 It is a schematic flow chart of a method for detecting the spectral attenuation consistency of a lens blue light blocking film layer provided by an embodiment of the present invention;

[0088] Figure 2 It is a functional module diagram of a system for detecting the spectral attenuation consistency of a lens blue light blocking film layer provided by an embodiment of the present invention;

[0089] The realization, functional characteristics and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0090] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0091] The embodiments of the present application provide a method for detecting the spectral attenuation consistency of a lens blue light blocking film layer. The execution subject of the method for detecting the spectral attenuation consistency of the lens blue light blocking film layer includes but is not limited to at least one of electronic devices such as a server, a terminal, etc. that can be configured to execute the method provided by the embodiments of the present application. In other words, the method for detecting the spectral attenuation consistency of the lens blue light blocking film layer can be executed by software or hardware installed on a terminal device or a server device. The server includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, etc. The server can be an independent server or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, Content Delivery Network (CDN), and big data and artificial intelligence platforms.

[0092] Referring to Figure 1 As shown, it is a schematic flow chart of a method for detecting the spectral attenuation consistency of a lens blue light blocking film layer provided by an embodiment of the present invention. In this embodiment, the method for detecting the spectral attenuation consistency of the lens blue light blocking film layer includes:

[0093] S1. Perform gradient calculation on the blue light blocking film layer of the blue light blocking lens to obtain the local incident angle of the blue light blocking film layer;

[0094] In the embodiment of the present invention, the performing gradient calculation on the blue light blocking film layer of the blue light blocking lens to obtain the local incident angle of the blue light blocking film layer includes:

[0095] Scan the surface of the blue light blocking film layer by an optical three-dimensional profiler to obtain the topography data of the blue light blocking film layer, and construct a three-dimensional height model of the blue light blocking film layer according to the topography data. Wherein, the topography data represents the coordinates (x, y) and height information h(x, y) of the three-dimensional contour of the surface of the blue light blocking film layer, reflecting the microscopic undulations of the film layer surface. The three-dimensional height model is a mathematical model with the two-dimensional plane coordinate system as the independent variable and the height of the film layer surface as the dependent variable, used to describe the spatial morphology of the film layer surface;

[0096] Discretize the three-dimensional height model into two-dimensional grid data of the blue light blocking film layer, and use the central difference method to calculate the partial derivatives of the grid points in the two-dimensional grid data to obtain two components of the gradient vector. Wherein, the two-dimensional grid data represents dividing the continuous three-dimensional height model into regular grids, and each grid point corresponds to coordinates and height values, forming a two-dimensional array. The partial derivative represents the first-order derivative of the three-dimensional height model with respect to x or y, describing the rate of change of height in the x or y direction;

[0097] Form a gradient vector field of the three-dimensional height model according to the partial derivatives. Wherein, the gradient vector field is a vector set composed of the partial derivatives of all grid points, and each vector is , representing the direction and rate of the fastest height change;

[0098] Determine the normal vectors of each surface point in the blue light blocking film layer based on the gradient vector field;

[0099] Specifically, according to the relationship between the surface normal vector and the gradient vector in three-dimensional space, expand the gradient vector into a three-dimensional form , and perform normalization processing on it to obtain a unit normal vector, which is the normal vector corresponding to the surface point of the blue light blocking film layer.

[0100] Perform a vector dot product on the normal vector and the incident light direction vector of the surface point to obtain an angle. Wherein, the incident light direction vector represents the unit vector of the light incident direction, usually assumed to be perpendicular to the central surface of the lens;

[0101] Determine the cosine value of the angle as the local incident angle of the blue light blocking film layer. Wherein, the local incident angle represents the angle between the incident light and the normal vector of the film layer surface.

[0102] Generally speaking: By constructing a three-dimensional height model of the film layer and discretizing it into two-dimensional grid data, calculating the partial derivatives of each grid point to form a gradient vector field, and then determining the surface point normal vector, the true local incident angle is obtained through dot product operation in combination with the incident light direction vector. This method breaks the idealized assumption of a traditional fixed incident angle, can capture the spatial differences in the incident angle caused by the microscopic undulations or curvature changes on the film layer surface (such as different incident angles in the edge region and the central region), enables the subsequent refraction angle calculated based on Snell's law to truly reflect the light deflection characteristics under non-orthogonal incident conditions, avoids the optical path calculation deviation caused by assuming a fixed incident angle, and lays a foundation for accurately establishing a sub-region interference condition model and improving the detection accuracy of spectral attenuation consistency.

[0103] S2. Collect the refractive index - radial coordinate data set of the blue light blocking film layer, and perform non-linear fitting on the refractive index - radial coordinate data set to obtain the refractive index fitting function of the blue light blocking film layer;

[0104] In the embodiment of the present invention, the collection of the refractive index - radial coordinate data set of the blue light blocking film layer includes:

[0105] Collect the effective refractive indices of multiple feature points on the blue light blocking film layer;

[0106] Specifically, select multiple feature points on the surface of the blue light blocking film layer according to certain rules (such as equidistant grid, circular array, etc.), then use a high-precision ellipsometer, align its probe with the feature points, set the measurement parameters (such as wavelength range, incident angle, etc.) according to the instrument operation specifications, measure the reflection or transmission characteristics of the film layer at the feature points for different polarization states of light through the ellipsometer, process the measurement data based on optical principles, thereby calculate the effective refractive index of each feature point, and make records to provide basic data for subsequent data matching and analysis.

[0107] Calculate the distance between the feature point and the center of the blue light blocking lens according to the Euclidean distance formula to obtain the feature distance between the feature point and the center of the blue light blocking lens;

[0108] Determine the radial coordinate of the feature point according to the feature distance;

[0109] Specifically, the distance from the feature point to the center of the blue light blocking lens is the measure of its radial coordinate, so directly take the calculated feature distance as the radial coordinate of the feature point, thus completing the determination process from the feature distance to the radial coordinate.

[0110] Match the effective refractive index and the radial coordinate to obtain the refractive index - radial coordinate data pair of the feature point;

[0111] Specifically, ensure that the effective refractive index values of each feature point and the corresponding radial coordinate values are accurately obtained, and establish a data storage structure. For each feature point, use its radial coordinate as an index and its effective refractive index value as the corresponding data, and store them in sequence according to the order of the feature points, so as to form a one-to-one refractive index - radial coordinate data pair, which is convenient for subsequent data analysis and processing.

[0112] Collect the refractive index - radial coordinate data pairs into a refractive index - radial coordinate data set of the blue light blocking film layer.

[0113] In the embodiment of the present invention, the non - linear fitting of the refractive index - radial coordinate data set to obtain the refractive index fitting function of the blue light blocking film layer includes:

[0114] Select a graded refractive index model as the fitting model of the refractive index fitting function of the blue light blocking film layer;

[0115] Specifically, according to the characteristic that the refractive index of the blue light blocking film layer may vary radially, select a graded refractive index model from a variety of refractive index models. This model assumes that the refractive index of the film layer changes gradually in the radial direction, which conforms to the actual possible refractive index distribution of the film layer and can better describe the change trend of the film layer refractive index with the radial coordinate.

[0116] Use the least - squares method to construct a fitting equation set for the fitting model;

[0117] Specifically, the purpose is to make the gap between the predicted value of the graded refractive index model and the actually collected refractive index data as small as possible. Take the partial derivative coefficients of two key parameters in the graded refractive index model, that is, the refractive index at the lens center and the refractive index gradient coefficient, which is to find the rate of change of the total gap with respect to these two parameters. When the rate of change is 0, it means that the state of the minimum total gap is reached. List these two conditions where the rate of change is 0, and a set of equations is formed. This set of equations is the fitting equation set we need.

[0118] Use the matrix inversion method to solve the fitting equation set to obtain the fitting parameters of the fitting model, where the fitting parameters include the refractive index at the lens center and the refractive index gradient coefficient;

[0119] Specifically, organize the fitting equation set into matrix form , where is the coefficient matrix, is the parameter vector to be solved (i.e., the fitting parameters), is the constant term vector. For a linear equation set in the form of , when the coefficient matrix is invertible, its solution is , so by calculating the coefficient matrix of the inverse matrix , and multiplying it with the vector , the fitting parameters can be obtained.

[0120] Substitute the fitting parameters into the refractive index fitting function to obtain the refractive index value of the radial coordinate. Among them, the refractive index fitting function is as follows:

[0121]

[0122] In the formula, represents the refractive index value when the radial coordinate is , represents the refractive index at the center of the lens, represents the refractive index gradient coefficient, represents the radial coordinate.

[0123] Specifically, after obtaining the specific values of the refractive index at the center of the lens and the refractive index gradient coefficient, substitute them into the graded refractive index model , for any given radial coordinate , the corresponding refractive index value can be calculated through this function, thus completely determining the refractive index fitting function of the blue light blocking film layer, which can describe the refractive index situation of the film layer at different radial positions.

[0124] Generally speaking: By obtaining the effective refractive indices of multiple characteristic points on the film layer surface and their corresponding radial coordinates, constructing a mathematical model reflecting the spatial distribution of the refractive index, breaking through the traditional assumption of uniform refractive index, and accurately describing the gradual change law of the film layer refractive index with the radial position (such as the attenuation characteristics from the center to the edge). This fitting function provides the refractive index distribution values of the sub-coordinate points for the subsequent calculation of the total optical thickness, and combines with the thickness matrix to achieve refined modeling of the optical characteristics of each region of the film layer, enabling the calculation of the equivalent refractive index, refraction angle, and theoretical transmission center wavelength to truly reflect the actual optical behavior of the film layer, solving the problem of the deviation between theory and measurement caused by ignoring the spatial variation of the refractive index in the prior art, and improving the accuracy of the spectral attenuation consistency detection.

[0125] S3. Based on the thickness matrices of all layers in the blue light blocking film layer and the dependent variables of the refractive index fitting function, calculate the total optical thickness of the blue light blocking film layer through the optical thickness calculation formula;

[0126] In the embodiment of the present invention, the calculating the total optical thickness of the blue light blocking film layer through the optical thickness calculation formula based on the thickness matrices of all layers in the blue light blocking film layer and the dependent variables of the refractive index fitting function includes:

[0127] The anti-blue light film layer is hierarchically segmented by the refractive index difference of materials to obtain multiple layers of the anti-blue light film layer;

[0128] Specifically, the refractive indices of different materials are different. Using high-precision optical measurement equipment such as a spectroscopic ellipsometer, the refractive index of the anti-blue light film layer is measured point by point. According to the measured refractive index value changes, the regions with similar refractive indices are divided into the same layer, thereby dividing the entire anti-blue light film layer into multiple different layers.

[0129] Taking the center of the lens of the anti-blue light lens as the center of the coordinate system, a plane coordinate system of the layer is constructed;

[0130] Specifically, determine the physical center position of the anti-blue light lens and use it as the origin (0, 0) of the plane rectangular coordinate system. According to the actual shape of the film layer and the measurement requirements, determine the positive directions of the x-axis and y-axis to establish a plane rectangular coordinate system. Each point on the film layer can be represented by two-dimensional coordinates to represent.

[0131] Collect the thickness values of each grid point in the layer in the horizontal and vertical directions of the plane coordinate system at a fixed interval;

[0132] Specifically, in the constructed plane coordinate system, perform grid division on the surface of the layer in the horizontal (x-axis direction) and vertical (y-axis direction) directions at a preset fixed interval to form a regular grid array. Use a high-precision thickness measuring instrument to measure the thickness of the film layer at each grid intersection (i.e., grid point), and record the thickness value corresponding to each grid point.

[0133] Sort the thickness values according to the positions of the grid points to obtain the thickness matrix of the layer;

[0134] Specifically, the coordinates of each grid point are associated with its corresponding thickness value and arranged in sequence according to the row and column order of the grid points in the plane coordinate system. The thickness values of all grid points form a two-dimensional array, which is the thickness matrix of this layer. The rows and columns in the thickness matrix correspond to the x-axis and y-axis directions in the plane coordinate system respectively, and the value of the matrix element is the thickness of the corresponding grid point.

[0135] Map the dependent variable of the refractive index fitting function onto the plane coordinate system to obtain the refractive index distribution value of the layer on the plane coordinate system;

[0136] Specifically, given the refractive index fitting function , for each coordinate point in the plane coordinate system, substitute its coordinates into the refractive index fitting function to calculate the refractive index value corresponding to this coordinate point , by calculating all the coordinate points in the plane coordinate system, the refractive index distribution values of the entire layer on the plane coordinate system are obtained.

[0137] Perform optical thickness calculation on the thickness matrix and the refractive index distribution values to obtain the total optical thickness of the blue light blocking film layer, where the optical thickness calculation formula is as follows:

[0138]

[0139] In the formula, represents the total optical thickness, represents the identifier of the layer, represents the total number of the layers, represents the refractive index distribution value of the represents the thickness matrix of the represents the two-dimensional coordinates of the plane coordinate system.

[0140] Specifically, according to the optical thickness calculation formula, for each coordinate point in the plane coordinate system, obtain the thickness value of each layer at this coordinate point from the thickness matrix , obtain the refractive index value of each layer at this coordinate point from the refractive index distribution values , multiply the refractive index value and the thickness value of the corresponding layer, and then sum the product results of all layers to obtain the total optical thickness at this coordinate point , repeat this process for all the coordinate points in the plane coordinate system that need to be calculated, and finally obtain the total optical thickness distribution of the entire blue light blocking film layer.

[0141] S4. Calculate the equivalent refractive index of the blue light blocking film layer according to the total optical thickness and the thickness matrix, and calculate the refraction angle of the blue light blocking film layer through Snell's law according to the local incident angle and the equivalent refractive index;

[0142] Specifically, substitute the total optical thickness and the thickness matrix into the calculation formula of the equivalent refractive index to obtain the refraction angle of the blue light blocking film layer.

[0143] In the embodiment of the present invention, the calculation formula of the equivalent refractive index is as follows:

[0144]

[0145] In the formula, represents the equivalent refractive index, represents the total optical thickness, represents the identifier of the said layer, represents the total number of the said layers, represents the thickness matrix of the represents the two-dimensional coordinates of the said planar coordinate system, represents the total thickness sum of all layers.

[0146] Specifically, the equivalent refractive index is the refractive index corresponding to regarding the film layers of a multi-layer complex structure as a whole homogeneous medium. It is hoped to find a single refractive index value that can represent the comprehensive effect of the entire film layer on light propagation. The total optical thickness reflects the total phase shift of the light beam passing through the actual film layer, and this phase shift is determined by the equivalent refractive index under the condition of assuming the material is homogeneous. The "equivalent refractive index" deduced therefrom is the refractive index of the virtual homogeneous material that makes the two phase shifts equal. After substituting this refractive index into the refraction law, the derived refraction angle is the overall deflection effect of the light beam passing through the multi-layer film. Its mechanical connotation lies in ensuring the consistency of the phase evolution when light propagates in the actual gradient structure and the equivalent homogeneous medium.

[0147] In the embodiment of the present invention, according to the said local incident angle and the said equivalent refractive index, calculating the refraction angle of the anti-blue light film layer through Snell's law, including:

[0148] Determining the refractive index of the incident medium on the incident side in the anti-blue light film layer;

[0149] Substituting the refractive index of the incident medium, the said local incident angle, and the said equivalent refractive index into Snell's law to calculate the refraction angle of the anti-blue light film layer, where Snell's law is as follows:

[0150]

[0151] In the formula, represents the refractive index of the incident medium, represents the sine value of the said local incident angle, represents the said local incident angle, represents the said equivalent refractive index, represents the two-dimensional coordinates of the said planar coordinate system, represents the sine value of the said refraction angle, represents the said refraction angle.

[0152] Specifically, first, it is necessary to clarify what medium the light passes through when entering the anti-blue light film layer. If the light enters the film layer from the air, then according to known physical common sense, the refractive index of air Approximately 1; if light enters the film layer from other specific media, the accurate refractive index value of the medium needs to be obtained by referring to relevant materials or using special measuring instruments. Use the arcsine function , and calculate the refraction angle of the blue light blocking film layer .

[0153] Generally speaking: the thickness distribution of each layer in the plane coordinate system is recorded through the thickness matrix, so that the calculation of the total optical thickness can reflect the cumulative effect of the refractive index and thickness of different positions and different layers; the equivalent refractive index calculated on this basis can equivalent the multi-layer non-uniform structure to a locally homogeneous medium, combined with the dynamic local incident angle obtained through gradient operation, use Snell's law to calculate the refraction angle in different regions, and finally introduce the refractive index wavelength correlation correction in the thin film interference calculation to achieve the accurate calculation of the optical path difference and the theoretical transmission center wavelength in each region under non-orthogonal incidence, so that the theoretical calculation can truly reflect the optical property differences of different regions of the film layer, thereby reducing the deviation between theory and measurement and achieving the accurate evaluation of the spectral attenuation consistency.

[0154] S5. Perform thin film interference calculation on the total optical thickness and the cosine value of the refraction angle to obtain the theoretical transmission center wavelength of the blue light blocking film layer, and obtain the measured transmission center wavelength of the blue light blocking film layer;

[0155] In the embodiment of the present invention, the performing thin film interference calculation on the total optical thickness and the cosine value of the refraction angle to obtain the theoretical transmission center wavelength of the blue light blocking film layer includes:

[0156] Multiply the total optical thickness and the cosine value of the refraction angle to obtain the optical path difference of the blue light blocking film layer;

[0157] Specifically, given the total optical thickness of the blue light blocking film layer and the refraction angle , first calculate the cosine value of the refraction angle , then multiply the total optical thickness by , that is , and the result obtained is the optical path difference of the blue light blocking film layer. The optical path of light propagating in the film layer is related to the refraction angle. Through this calculation method, the optical path difference generated due to the path and medium characteristics when light propagates in the film layer can be determined.

[0158] According to the integer multiple relationship between the optical path difference and the wavelength in the thin film optical theory, construct the interference condition formula of the optical path difference and the theoretical transmission center wavelength of the blue light blocking film layer;

[0159] Specifically, according to the thin film optical theory, when light interferes in the thin film, there is an integer multiple relationship between the optical path difference and the wavelength. Let the optical path difference be , the theoretical transmission center wavelength is , an integer represents the interference order. Based on this relationship, a formula is constructed.

[0160] The refractive index of the film layer in the interference condition formula is corrected by the Cauchy formula to obtain the non-linear equation of the blue light blocking film layer;

[0161] Specifically, in the above interference condition formula , is related to the refractive index of the film layer. Considering the possible non-linear variation of the refractive index of the film layer (such as the refractive index distribution obtained by fitting with the graded refractive index model before), it is necessary to correct the refractive index of the film layer in the interference condition formula. The Cauchy formula describes the refractive index as a function form related to the wavelength. Substituting this function into the interference condition formula, the originally relatively simple linear relationship will be broken due to the introduction of the wavelength-related term, forming an equation containing complex forms such as different powers of the wavelength. Since the relationship of the wavelength in the equation is no longer simply linear, the non-linear equation of the blue light blocking film layer is obtained, which can be more accurately used for subsequent calculations and analyses of the theoretical transmission center wavelength, etc.

[0162] The non-linear equation is iteratively solved by the Newton-Raphson iteration method to obtain the theoretical transmission center wavelength.

[0163] Specifically, for the non-linear equation of the blue light blocking film layer, an initial value close to the true solution is first set and substituted into the non-linear equation and its derivative expression. By calculating the function value and derivative value of the equation at this point, a specific iteration formula is used to update the approximate solution to obtain the next value closer to the true solution. This process of substitution, calculation, and update is continuously repeated. Each iteration makes the approximate solution closer to the true solution until the pre-set convergence condition is met (such as the difference between the results of two adjacent iterations is less than a certain minimum value). At this time, the obtained value is the theoretical transmission center wavelength of the blue light blocking film layer.

[0164] Specifically, a spectral imaging device is used to scan the characteristic region of the blue light blocking film layer to obtain the transmittance data of each pixel point at different wavelengths, that is, each pixel point corresponds to a set of transmittance-wavelength curves. For the protection target of the blue light blocking film layer (such as the 400 - 480 nm blue light band), the transmittance data of each pixel point in this band in the three-dimensional data is extracted; through data analysis algorithms (such as peak detection, derivative method), the valley position of each transmittance curve is identified, and the wavelength corresponding to this valley is the measured transmission center wavelength of this pixel point in the blue light band.

[0165] Generally speaking: The optical path difference is calculated by multiplying the total optical thickness by the cosine value of the refraction angle. Based on the thin-film optical theory, the relationship between the optical path difference and an integer multiple of the wavelength is established, and the Cauchy formula is introduced to correct the wavelength dependence of the refractive index. The nonlinear optical characteristics of the film layer are incorporated into the theoretical model, and the Newton-Raphson iteration method is used to solve the nonlinear equation to obtain the theoretical transmission center wavelength. At the same time, three-dimensional spectral data of the characteristic region is collected by a spectral imaging device, and the valley wavelength of the transmittance in the blue light band of each pixel point is extracted as the measured value. This method comprehensively integrates the characteristics such as the thickness distribution gradient, the spatial variation of the refractive index, and the dynamic response of the refraction angle of the film layer into the theoretical calculation and is verified by the measured data, solving the problem of the disconnection between the theoretical model and the actual optical behavior in the prior art, and being able to accurately quantify the peak position and spatial consistency of the attenuation of the film layer to blue light, providing a scientific and reliable basis for the determination of the spectral attenuation consistency level.

[0166] S6. Generate the deviation value between the measured transmission center wavelength and the theoretical transmission center wavelength, and determine the spectral attenuation consistency level of the blue light blocking film layer based on the deviation value.

[0167] In the embodiment of the present invention, the generating the deviation value between the measured transmission center wavelength and the theoretical transmission center wavelength, and determining the spectral attenuation consistency level of the blue light blocking film layer based on the deviation value includes:

[0168] Perform a difference calculation on the measured transmission center wavelength and the theoretical transmission center wavelength to obtain the deviation value ;

[0169] Comprehensively evaluate the material structure and manufacturing process error of the blue light blocking film layer to obtain the deviation threshold between the measured transmission center wavelength and the theoretical transmission center wavelength ;

[0170] Specifically, by analyzing the material structure of the film layer, including factors such as the number of layers of the film layer, the refractive index of each layer of material, and the uniformity of the material, because different material characteristics and structures will have different effects on the propagation of light, thereby affecting the wavelength deviation. At the same time, carefully consider the manufacturing process error, such as the control accuracy of the thickness during the coating process, the bonding accuracy between layers, etc. These errors will directly or indirectly cause differences between the actual film layer and the theoretical design. Collect a large amount of data related to the material structure and manufacturing process through experimental tests, and use statistical methods to process and analyze these data to determine a reasonable deviation threshold , which can reflect the acceptable deviation range between the measured transmission center wavelength and the theoretical transmission center wavelength under the current material structure and manufacturing process level.

[0171] Judge and of the magnitudes:

[0172] When , it is determined that the spectral attenuation consistency level is unqualified;

[0173] When , it is determined that the spectral attenuation consistency level is qualified;

[0174] When , it is determined that the spectral attenuation consistency level is excellent.

[0175] Specifically, is the difference between the measured transmission center wavelength and the theoretical transmission center wavelength, which reflects the deviation degree between the actual measurement result and the theoretical expectation; The acceptable deviation range determined after comprehensively considering the material structure and manufacturing process errors. When , it means that the deviation between the actual and the theoretical exceeds twice the acceptable range, indicating that there is a large difference between the spectral attenuation characteristics of the film layer and the theoretical design, and it is very likely that the anti-blue light performance requirements cannot be met, so it is determined to be unqualified. When , at this time, the deviation value Although it exceeds the deviation threshold , but it has not reached twice the threshold, which indicates that there is a certain deviation between the actual spectral attenuation characteristics of the film layer and the theoretical design, but it is still within the relatively acceptable range, and its performance can basically meet the anti-blue light use requirements, so it is determined to be qualified. When , it shows that the deviation between the measured transmission center wavelength and the theoretical transmission center wavelength is very small, within the preset acceptable deviation range, which means that the actual spectral attenuation characteristics of the film layer are highly consistent with the theoretical design, and the anti-blue light performance is excellent, so it is determined to be excellent.

[0176] As Figure 2 shown, it is a functional module diagram of the spectral attenuation consistency detection system for the anti-blue light film layer of the lens provided by an embodiment of the present invention.

[0177] The spectral attenuation consistency detection system 100 for the anti-blue light film layer of the lens described in the present invention can be installed in an electronic device. According to the realized functions, the spectral attenuation consistency detection system 100 for the anti-blue light film layer of the lens can include a local incident angle calculation module 101, a refractive index fitting function generation module 102, a total optical thickness calculation module 103, a refraction angle calculation module 104, a wavelength generation module 105, and a judgment module 106. The modules described in the present invention can also be referred to as units, which refer to a series of computer program segments that can be executed by the processor of the electronic device and can complete fixed functions, and are stored in the memory of the electronic device.

[0178] In this embodiment, the functions of each module / unit are as follows:

[0179] The local incident angle calculation module 101 performs a gradient operation on the blue light blocking film layer of the blue light blocking lens to obtain the local incident angle of the blue light blocking film layer;

[0180] The refractive index fitting function generation module 102 collects the refractive index - radial coordinate data set of the blue light blocking film layer, performs non - linear fitting on the refractive index - radial coordinate data set to obtain the refractive index fitting function of the blue light blocking film layer;

[0181] The total optical thickness calculation module 103 calculates the total optical thickness of the blue light blocking film layer based on the thickness matrix of all layers in the blue light blocking film layer and the dependent variable of the refractive index fitting function through the optical thickness calculation formula;

[0182] The refraction angle calculation module 104 calculates the equivalent refractive index of the blue light blocking film layer according to the total optical thickness and the thickness matrix, and calculates the refraction angle of the blue light blocking film layer through Snell's law according to the local incident angle and the equivalent refractive index;

[0183] The wavelength generation module 105 performs thin - film interference resolution on the total optical thickness and the cosine value of the refraction angle to obtain the theoretical transmission center wavelength of the blue light blocking film layer, and obtains the measured transmission center wavelength of the blue light blocking film layer;

[0184] The judgment module 106 generates the deviation value between the measured transmission center wavelength and the theoretical transmission center wavelength, and determines the spectral attenuation consistency level of the blue light blocking film layer based on the deviation value.

[0185] In several embodiments provided by the present invention, it should be understood that the disclosed methods and systems can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division, and there can be other division methods in actual implementation.

[0186] The modules described as separate components may or may not be physically separated. The components shown as modules may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0187] In addition, in each embodiment of the present invention, the functional modules can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above - mentioned integrated units can be implemented in the form of hardware, or in the form of a combination of hardware and software functional modules.

[0188] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0189] The embodiments of the present application can acquire and process relevant data based on artificial intelligence technology. Among them, artificial intelligence is a theory, method, technology, and application system that uses digital computers or machines controlled by digital computers to simulate, extend, and expand human intelligence, perceive the environment, acquire knowledge, and use knowledge to obtain the best results.

[0190] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for detecting the spectral attenuation consistency of a blue light blocking film layer on a lens, characterized in that, The method includes: S1. Perform gradient calculation on the anti - blue - light film layer of the anti - blue - light lens to obtain the local incident angle of the anti - blue - light film layer; S2. Collect the refractive index - radial coordinate data set of the anti - blue - light film layer, and perform non - linear fitting on the refractive index - radial coordinate data set to obtain the refractive index fitting function of the anti - blue - light film layer; S3. Based on the thickness matrix of all levels in the anti - blue - light film layer and the dependent variable of the refractive index fitting function, calculate the total optical thickness of the anti - blue - light film layer through the optical thickness calculation formula; S4. Calculate the equivalent refractive index of the anti - blue - light film layer according to the total optical thickness and the thickness matrix. According to the local incident angle and the equivalent refractive index, calculate the refraction angle of the anti - blue - light film layer through Snell's law; S5. Perform thin - film interference calculation on the total optical thickness and the cosine value of the refraction angle to obtain the theoretical transmission center wavelength of the anti - blue - light film layer, and obtain the measured transmission center wavelength of the anti - blue - light film layer; S6. Generate the deviation value between the measured transmission center wavelength and the theoretical transmission center wavelength, and determine the spectral attenuation consistency level of the anti - blue - light film layer based on the deviation value.

2. The method for detecting the spectral attenuation consistency of the blue light blocking film layer of the lens according to claim 1, characterized in that, The performing gradient calculation on the anti - blue - light film layer of the anti - blue - light lens to obtain the local incident angle of the anti - blue - light film layer includes: Obtain the topography data of the anti - blue - light film layer, and construct a three - dimensional height model of the anti - blue - light film layer according to the topography data; Discretize the three - dimensional height model into two - dimensional grid data of the anti - blue - light film layer, and calculate the partial derivatives of the grid points in the two - dimensional grid data; Form a gradient vector field of the three - dimensional height model according to the partial derivatives; Determine the normal vectors of each surface point in the anti - blue - light film layer based on the gradient vector field; Perform a vector dot - product on the normal vector and the incident light direction vector of the surface point to obtain an included angle; Determine the cosine value of the included angle as the local incident angle of the anti - blue - light film layer.

3. The method for detecting the spectral attenuation consistency of the anti-blue light film layer of the lens according to claim 1, characterized in that, The collecting the refractive index - radial coordinate data set of the anti - blue - light film layer includes: Collect the effective refractive indices of multiple feature points on the anti - blue - light film layer; Calculate the distance between the feature point and the center of the anti - blue - light lens according to the Euclidean distance formula to obtain the feature distance between the feature point and the center of the anti - blue - light lens; Determine the radial coordinate of the feature point according to the feature distance; Match the effective refractive index and the radial coordinate to obtain the refractive index - radial coordinate data pair of the feature point; Collect the refractive index - radial coordinate data pairs into the refractive index - radial coordinate data set of the anti - blue - light film layer.

4. The method for detecting the spectral attenuation consistency of the blue light protection film layer of the lens according to claim 3, characterized in that, The performing non - linear fitting on the refractive index - radial coordinate data set to obtain the refractive index fitting function of the anti - blue - light film layer includes: Select the fitting model of the refractive index fitting function; Construct the fitting equation system of the fitting model; Solve the fitting equation system to obtain the fitting parameters of the fitting model, where the fitting parameters include the refractive index at the lens center and the refractive index gradient coefficient; Substitute the fitting parameters into the refractive index fitting function to obtain the refractive index value of the radial coordinate, where the refractive index fitting function is as follows: ； wherein, represents the refractive index value at the radial coordinate of , represents the refractive index at the center of the lens, represents the refractive index gradient coefficient, represents the radial coordinate.

5. The method for detecting the spectral attenuation consistency of the anti-blue light film layer of the lens according to claim 2, wherein Based on the thickness matrix of all layers in the blue light blocking film layer and the dependent variable of the refractive index fitting function, the total optical thickness of the blue light blocking film layer is calculated through the optical thickness calculation formula, including: Segment the blue light blocking film layer into multiple layers; Take the center of the lens of the blue light blocking lens as the center of the coordinate system, and construct the plane coordinate system of the layer; Collect the thickness values of each grid point in the layer at fixed intervals in the horizontal and vertical directions of the plane coordinate system; Sort the thickness values according to the positions of the grid points to obtain the thickness matrix of the layer; Map the dependent variable of the refractive index fitting function onto the plane coordinate system to obtain the refractive index distribution value of the layer on the plane coordinate system; Perform optical thickness calculation on the thickness matrix and the refractive index distribution value to obtain the total optical thickness of the blue light blocking film layer, where the optical thickness calculation formula is as follows: ； In the formula, represents the total optical thickness, represents the identifier of the said layer, represents the total number of the said layers, represents the refractive index distribution value of the represents the thickness matrix of the represents the two-dimensional coordinates of the said planar coordinate system.

6. The method for detecting the spectral attenuation consistency of the anti-blue light film layer of the lens according to claim 5, wherein The calculation formula of the equivalent refractive index is as follows: ； Wherein, represents the equivalent refractive index, represents the total optical thickness, represents the identifier of the layer, represents the total number of the layers, represents the thickness matrix of the represents the two-dimensional coordinates of the plane coordinate system, represents the sum of the thicknesses of all layers.

7. The spectral attenuation consistency detection method of the blue light blocking film layer for the lens according to claim 6, characterized in that, According to the local incident angle and the equivalent refractive index, calculate the refraction angle of the blue light blocking film layer through Snell's law, including: Determine the refractive index of the incident medium on the incident side in the blue light blocking film layer; Substitute the refractive index of the incident medium, the local incident angle, and the equivalent refractive index into Snell's law to calculate the refraction angle of the blue light blocking film layer, where Snell's law is as follows: ； Wherein, represents the refractive index of the incident medium, represents the sine value of the local incident angle, represents the local incident angle, represents the equivalent refractive index, represents the two-dimensional coordinates of the plane coordinate system, represents the sine value of the refraction angle, represents the refraction angle.

8. The spectral attenuation consistency detection method of the blue light prevention film layer for the lens according to claim 1, characterized in that, Perform thin film interference calculation on the total optical thickness and the cosine value of the refraction angle to obtain the theoretical transmission center wavelength of the blue light blocking film layer, including: Multiply the total optical thickness and the cosine value of the refraction angle to obtain the optical path difference of the blue light blocking film layer; According to the integer multiple relationship between the optical path difference and the wavelength in thin film optical theory, construct the interference condition formula between the optical path difference and the theoretical transmission center wavelength of the blue light blocking film layer; Correct the film layer refractive index in the interference condition formula to obtain the non-linear equation of the blue light blocking film layer; Perform iterative solution on the non-linear equation to obtain the theoretical transmission center wavelength.

9. The spectral attenuation consistency detection method of the blue light blocking film layer for the lens according to claim 1, characterized in that, Generate the deviation value between the measured transmission center wavelength and the theoretical transmission center wavelength, and determine the spectral attenuation consistency level of the blue light blocking film layer based on the deviation value, including: Calculate the difference between the measured transmission center wavelength and the theoretical transmission center wavelength to obtain the deviation value ; Comprehensively evaluate the material structure and manufacturing process errors of the blue light blocking film layer to obtain the deviation threshold between the measured transmission center wavelength and the theoretical transmission center wavelength ; Judge and for size: When it is determined that the spectral attenuation consistency level is unqualified; When it is determined that the spectral attenuation consistency level is qualified; When is satisfied, it is determined that the spectral attenuation consistency level is excellent.

10. Spectral attenuation consistency detection system for the anti-blue light film layer of a lens, characterized in that, The system includes: A local incident angle calculation module for performing gradient operation on the blue light blocking film layer of the blue light blocking lens to obtain the local incident angle of the blue light blocking film layer; A refractive index fitting function generation module for collecting the refractive index - radial coordinate data set of the blue light blocking film layer and performing non-linear fitting on the refractive index - radial coordinate data set to obtain the refractive index fitting function of the blue light blocking film layer; A total optical thickness calculation module for calculating the total optical thickness of the blue light blocking film layer through the optical thickness calculation formula based on the thickness matrix of all layers in the blue light blocking film layer and the dependent variable of the refractive index fitting function; A refraction angle calculation module for calculating the equivalent refractive index of the blue light blocking film layer according to the total optical thickness and the thickness matrix, and calculating the refraction angle of the blue light blocking film layer through Snell's law according to the local incident angle and the equivalent refractive index; A wavelength generation module is configured to perform thin-film interference resolution on the total optical thickness and the cosine value of the refraction angle to obtain the theoretical transmission center wavelength of the blue-light blocking film layer, and acquire the measured transmission center wavelength of the blue-light blocking film layer; A judgment module is configured to generate a deviation value between the measured transmission center wavelength and the theoretical transmission center wavelength, and determine the spectral attenuation consistency level of the blue-light blocking film layer based on the deviation value.

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