Glass optical element molding mold surface shape-optical error compensation method and device

Abstract

The application discloses a glass optical element mould pressing mould surface shape-optical error compensation method and device, and the method comprises the following steps: determining glass high-temperature viscoelastic parameters by using a creep test method based on constant pressure stress micro-deformation low-friction disturbance axial compression; constructing an initial glass optical element profile curve equation to determine initial mould pressing mould parameters, and then establishing a glass pre-form simulation model under force-thermal coupling; simulating the mould pressing forming process by using a simulation prediction model to obtain a simulation glass optical element, and predicting the prediction surface shape error and the prediction optical error of the simulation glass optical element; compensating the initial mould pressing mould parameters based on the prediction surface shape error and the prediction optical error, so as to manufacture a compensated mould pressing mould based on the compensated mould pressing mould parameters. The application can compensate the surface shape-optical error of the mould pressing mould parameters, and high-precision and high-optical-performance glass optical elements can be obtained by one-time mould pressing forming through the compensated mould pressing mould.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultra-precision molding technology, and particularly relates to a glass optical element ultra-precision molding mold surface-optical error compensation method and a glass optical element ultra-precision molding mold surface-optical error compensation device. BACKGROUND

[0002] Traditional glass optical element manufacturing processes mainly include ultra-precision grinding, polishing or single-point diamond turning and other cold processing technologies. Although these cold processing technologies can achieve high-precision manufacturing of glass optical elements, they have problems of low processing efficiency and poor consistency. In particular, with the rapid development of semiconductor lithography and precision optical devices, a large number of glass optical elements need to be manufactured, and how to manufacture nanometer precision fused quartz optical elements at low cost, high efficiency and in large quantities faces great challenges.

[0003] As a kind of hot forming technology, the precision glass molding technology can copy the surface topography of the mold to the surface of the glass by applying a molding force after heating the glass to the softening temperature, and the glass optical element can be obtained after cooling and annealing. The glass optical element molding process is: mold design → mold manufacturing → mold coating → molding. In the glass optical element molding process, the optical glass is in a viscoelastic state, and thermal expansion and contraction will occur after annealing and cooling, which will cause the profile curve of the molded glass element to deviate from the designed profile curve of the glass optical element, and thus a large surface error will be generated.

[0004] In order to realize nanometer precision molding of glass optical elements, the glass thermal expansion and contraction of the molding mold needs to be compensated. According to the existing compensation method, the surface error of the optical element obtained by the molding test is used to compensate and correct the mold, and the mold needs to be repeatedly tested and corrected many times. This method has problems of many correction times, high cost and long cycle. In addition, in addition to the surface error affecting the molding performance of the glass optical element, the residual stress of the glass optical element during the annealing and cooling stage will also affect its optical performance (such as refractive index), so the mold also needs to be compensated for optical error. However, the existing glass optical element molding technology does not consider the optical error compensation of the mold, resulting in poor optical performance of the glass optical element obtained by molding.

[0005] Therefore, a glass optical element molding mold surface-optical error compensation method is needed to solve the problems in the above technical solutions. SUMMARY

[0006] Therefore, the present application provides a glass optical element molding mold surface-optical error compensation method and a glass optical element molding mold surface-optical error compensation device to solve or at least alleviate the above problems.

[0007] According to an aspect of the present application, there is provided a glass optical element mold pressing mold surface-optical error compensation method, executed in a computing device, comprising: obtaining a creep displacement of a glass by using a creep test method based on constant pressure stress micro-deformation low-friction perturbation axial compression; determining a high-temperature viscoelasticity parameter of the glass based on the creep displacement; constructing an initial glass optical element profile curve equation, determining an initial mold pressing mold parameter based on the initial glass optical element profile curve equation; establishing a glass preform simulation model under force-thermal coupling based on the initial mold pressing mold parameter; simulating a mold pressing forming process by using a simulation prediction model based on the initial mold pressing mold parameter, the glass preform simulation model and the high-temperature viscoelasticity parameter of the glass to obtain a simulation glass optical element, and predicting a surface error and an optical error of the simulation glass optical element to obtain corresponding predicted surface error and predicted optical error; compensating the initial mold pressing mold parameter based on the predicted surface error and the predicted optical error to obtain a compensated mold pressing mold parameter, so as to manufacture a compensated mold pressing mold based on the compensated mold pressing mold parameter.

[0008] Optionally, in the glass optical element mold pressing mold surface-optical error compensation method according to the present application, the compensated mold pressing mold is used for mold pressing forming test to obtain a test surface error and a test optical error of a test glass optical element; the method further comprises: determining the test surface error and the test optical error of the test glass optical element obtained by using the compensated mold pressing mold for mold pressing forming test; judging whether the test surface error and the test optical error are respectively less than a surface error threshold value and an optical error threshold value, if not, then: modifying the simulation prediction model based on the test surface error and the test optical error of the test glass optical element to obtain a modified simulation prediction model this time; simulating a mold pressing forming process by using the modified simulation prediction model this time based on the initial mold pressing mold parameter, the glass preform simulation model and the high-temperature viscoelasticity parameter of the glass to obtain a simulation glass optical element, and predicting a surface error and an optical error of the simulation glass optical element to obtain corresponding predicted surface error and predicted optical error; compensating the initial mold pressing mold parameter based on the predicted surface error and the predicted optical error to obtain a compensated mold pressing mold parameter, so as to manufacture a compensated mold pressing mold based on the compensated mold pressing mold parameter; iteratively executing the above steps until the test surface error and the test optical error of the test glass optical element are respectively less than the surface error threshold value and the optical error threshold value, and the modified simulation prediction model this time is taken as a final simulation prediction model.

[0009] Optionally, in the glass optical element molding die surface shape-optical error compensation method according to the present invention, the molding process includes a molding stage and an annealing and cooling stage; based on the initial molding die parameters, the glass preform simulation model, and the glass high-temperature viscoelastic parameters, the molding process is simulated to obtain a simulated glass optical element, including: determining molding process conditions, the molding process conditions including initial temperature, target temperature, and predetermined molding pressure; based on the initial molding die parameters, the glass preform simulation model, and the glass high-temperature viscoelastic parameters, and according to the molding process conditions, the molding stage of the glass preform is simulated to obtain an initial glass optical element as the molding result; the molding result is used as the initial conditions for the annealing and cooling stage to simulate the annealing and cooling stage to obtain a simulated glass optical element.

[0010] Optionally, in the glass optical element molding die surface shape-optical error compensation method according to the present invention, the predicted optical error includes the glass refractive index; predicting the surface shape error and optical error of the simulated glass optical element to obtain the corresponding predicted surface shape error and predicted optical error includes: using interpolation to fit the node coordinates of the simulated glass optical element and the node coordinates of the initial molding die corresponding to the initial molding die parameters to determine the predicted surface shape error of the simulated glass optical element; constructing a volume change-refractive index model of the glass optical element during the annealing and cooling stage, wherein the volume change-refractive index model of the glass optical element is used to simulate the volume and refractive index changes of the glass optical element during the annealing and cooling stage; and solving the volume change-refractive index model of the glass element to obtain the final refractive index of the simulated glass optical element, and using the final refractive index as the glass refractive index of the simulated glass optical element.

[0011] Optionally, in the glass optical element molding die surface shape-optical error compensation method according to the present invention, the initial molding die parameters are compensated based on the predicted surface shape error and the predicted optical error to obtain the compensated molding die parameters, including: performing optical error compensation on the initial glass optical element profile curve equation based on the glass refractive index to obtain a first glass optical element profile curve equation; determining first compensated molding die parameters based on the first glass optical element profile curve equation; constructing a surface shape error compensation model based on the predicted surface shape error and the first compensated glass optical element profile curve equation; determining a compensation factor based on the surface shape error compensation model; and performing surface shape error compensation on the first compensated molding die parameters based on the compensation factor to obtain the compensated molding die parameters.

[0012] Optionally, in the glass optical element molding die surface shape-optical error compensation method according to the present invention, the surface shape error compensation of the first compensation molding die parameters based on the compensation factor to obtain the compensated molding die parameters includes: compensating the first compensation glass optical element contour curve equation based on the compensation factor to obtain the second compensation glass optical element contour curve equation; and determining the compensated molding die parameters based on the second compensation glass optical element contour curve equation.

[0013] Optionally, in the glass optical element molding die surface shape-optical error compensation method according to the present invention, the creep displacement of the glass is obtained using a creep test method based on constant pressure stress micro-deformation low friction disturbance axial compression. This includes: grinding and polishing the surfaces of the glass to be tested, the upper sapphire substrate, and the lower sapphire substrate respectively; clamping the polished glass between the upper and lower sapphire substrates to form a test module; and placing the test module at the center of the test platform of the test device. The creep test method based on constant pressure stress micro-deformation low friction disturbance axial compression is then executed through the test device, including: contacting the measuring probe with the upper surface of the upper sapphire substrate; heating the glass to the test temperature using an infrared or electromagnetic heating device; maintaining the temperature for a predetermined time; applying a vertical load to the upper sapphire substrate using a load application device and a parallel guiding system; and obtaining the creep displacement of the glass at the test temperature using a high-precision displacement sensor.

[0014] Optionally, in the glass optical element molding die surface shape-optical error compensation method according to the present invention, determining the high-temperature viscoelastic parameters of the glass based on the creep displacement includes: constructing a stress relaxation model based on the creep displacement, and determining the high-temperature viscoelastic parameters of the glass based on the stress relaxation model; wherein, the high-temperature viscoelastic parameters of the glass include shear modulus and shear stress relaxation time.

[0015] Optionally, in the glass optical element molding die surface shape-optical error compensation method according to the present invention, the glass optical element is a glass aspherical lens, a double-sided aspherical lens, an aspherical array, or a columnar aspherical array.

[0016] Optionally, in the glass optical element molding die surface shape-optical error compensation method according to the present invention, constructing the initial glass optical element profile curve equation includes: using optical design software to construct the initial glass optical element profile curve equation.

[0017] Optionally, in the glass optical element molding die surface shape-optical error compensation method according to the present invention, the volume change-refractive index model of the glass optical element is as follows:

[0018]

[0019] n c =n+Δn

[0020] Where V0 represents the initial volume of the pre-formed glass optical element before annealing and cooling, V c The final volume of the simulated glass optical element after annealing and cooling is represented by n; n represents the initial refractive index of the pre-formed glass optical element before annealing and cooling. c This indicates the final refractive index of the simulated glass optical element after annealing and cooling.

[0021] According to one aspect of the present invention, a glass optical element molding die surface shape-optical error compensation device is provided, deployed in a computing device. The device comprises: an acquisition unit adapted to acquire the creep displacement of the glass using a creep test method based on constant pressure stress micro-deformation low-friction disturbance axial compression, and to determine the high-temperature viscoelastic parameters of the glass based on the creep displacement; a construction unit adapted to construct an initial glass optical element profile curve equation, and to determine initial molding die parameters based on the initial glass optical element profile curve equation; and a establishment unit adapted to establish a glass preform under force-thermal coupling based on the initial molding die parameters. The system includes a volumetric simulation model and a simulation prediction unit, adapted to use the simulation prediction model to simulate the molding process based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass to obtain a simulated glass optical element, and to predict the surface shape error and optical error of the simulated glass optical element to obtain the corresponding predicted surface shape error and predicted optical error; and a compensation unit, adapted to compensate the initial molding die parameters based on the predicted surface shape error and predicted optical error to obtain compensated molding die parameters, so as to manufacture a compensated molding die based on the compensated molding die parameters.

[0022] Optionally, in the glass optical element molding die surface shape-optical error compensation device according to the present invention, the compensated molding die is used for molding tests to obtain the test surface shape error and test optical error of the glass optical element after the test; the device further includes:

[0023] The determining unit is adapted to determine the test surface shape error and test optical error of the glass optical element obtained by molding test using the compensated molding die;

[0024] The judgment unit is adapted to determine whether the test surface shape error and the test optical error are less than the surface shape error threshold and the optical error threshold, respectively:

[0025] If the test surface shape error is not less than the surface shape error threshold or the test optical error is not less than the optical error threshold, the correction unit is adapted to correct the simulation prediction model based on the test surface shape error and test optical error of the glass optical element after the test, so as to obtain the corrected simulation prediction model.

[0026] The simulation prediction unit is also adapted to: using the modified simulation prediction model, based on the initial molding die parameters, the glass preform simulation model and the high-temperature viscoelastic parameters of the glass, to simulate the molding process to obtain a simulated glass optical element, and to predict the surface shape error and optical error of the simulated glass optical element, thereby obtaining the corresponding predicted surface shape error and predicted optical error;

[0027] The compensation unit is also adapted to: compensate the initial molding die parameters based on the predicted surface error and the predicted optical error to obtain the compensated molding die parameters, so as to manufacture the compensated molding die based on the compensated molding die parameters, until the test surface error and test optical error of the glass optical element after the test are less than the surface error threshold and the optical error threshold, respectively, and then use the current corrected simulation prediction model as the final simulation prediction model.

[0028] According to one aspect of the present invention, a computing device is provided, comprising: at least one processor; and a memory storing program instructions, wherein the program instructions are configured to be executed by the at least one processor, the program instructions including instructions for performing the glass optical element molding die surface shape-optical error compensation method as described above.

[0029] According to one aspect of the present invention, a computer program product is provided, comprising a computer program / instructions, wherein the computer program / instructions, when executed by a processor, implement the method as described above.

[0030] According to one aspect of the present invention, a readable storage medium storing program instructions is provided, which, when read and executed by a computing device, causes the computing device to perform the glass optical element molding die surface shape-optical error compensation method as described above.

[0031] According to the technical solution of the present invention, a method for compensating for surface shape and optical error of a glass optical element molding die is provided. This method utilizes a creep test method based on constant pressure stress, micro-deformation, low friction disturbance, and axial compression to obtain the high-temperature viscoelastic parameters of the glass. By constructing an initial glass optical element contour curve equation, the initial molding die parameters are determined, and a glass preform simulation model under force-thermal coupling is established. Then, using a simulation prediction model based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass, the surface shape error and optical error of the glass optical element are simulated and predicted. The predicted surface shape error and optical error compensate for the initial molding die parameters, and the compensated molding die can then be fabricated based on the compensated molding die parameters. According to the technical solution of the present invention, firstly, a creep test method based on constant pressure stress micro-deformation low friction disturbance axial compression can be used to obtain high-precision high-temperature viscoelastic parameters of glass. Then, a simulation prediction model can be used to accurately simulate and predict the surface shape error and optical error of the molded glass optical element. Secondly, based on the predicted surface shape error and optical error, the surface shape error and optical error compensation can be performed on the molding die parameters simultaneously. With the molding die after surface shape-optical error compensation, a high-precision, high-optical-performance glass optical element can be molded in one step. On the one hand, this solves the problem of poor optical performance of glass optical elements caused by not considering optical errors, thus improving the optical performance of glass optical elements. On the other hand, it avoids repeated mold repairs, thereby reducing the number of compensations for the molding die and reducing the manufacturing cost and cycle of the molding die.

[0032] Furthermore, this invention can continuously refine the simulation prediction model based on the experimental surface shape error and experimental optical error of the glass optical element after testing, thereby continuously improving the compensation accuracy of the simulation prediction model. The final simulation prediction model obtained after multiple refinements can achieve higher-precision simulation prediction of the surface shape error and optical error of the glass optical element, thereby enabling precise compensation of the molding die parameters and improving compensation accuracy.

[0033] Furthermore, the glass optical element molding die surface shape-optical error compensation method according to the present invention is applicable to the compensation of conventional glass aspherical lenses, double-sided aspherical lenses, aspherical arrays, or columnar aspherical arrays of different sizes. It has wide adaptability. Based on the compensation, the molding die can improve the surface shape accuracy, optical performance, and consistency of the molded glass optical element, meeting the needs of aerospace, biomedicine, defense, 5G+AI, new energy vehicle and other industries for the mass and efficient manufacturing of glass optical elements, and has broad application prospects.

[0034] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0035] To achieve the foregoing and related objectives, certain illustrative aspects are described herein in conjunction with the following description and accompanying drawings. These aspects indicate various ways in which the principles disclosed herein may be practiced, and all aspects and their equivalents are intended to fall within the scope of the claimed subject matter. The foregoing and other objectives, features, and advantages of the invention will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings. Throughout the invention, the same reference numerals generally refer to the same parts or elements.

[0036] Figure 1 A schematic diagram of a computing device 100 provided according to an embodiment of the present invention is shown;

[0037] Figure 2 A schematic flowchart of a glass optical element molding die surface shape-optical error compensation method 200 provided according to an embodiment of the present invention is shown.

[0038] Figure 3 A schematic diagram of a testing apparatus 300 provided according to an embodiment of the present invention is shown;

[0039] Figure 4 A schematic diagram showing the principle comparison between traditional large-strain frictional perturbation creep test and constant-pressure low-frictional perturbation creep test is presented.

[0040] Figure 5 A schematic flowchart of a glass optical element molding die surface shape-optical error compensation method 500 provided according to some embodiments of the present invention is shown.

[0041] Figure 6 A schematic diagram of the predicted surface shape error of a simulated glass optical element (aspherical lens) according to a specific embodiment of the present invention is shown;

[0042] Figure 7 A schematic diagram is shown of the surface shape error of a glass optical element molded using an initial molding die corresponding to uncompensated initial molding die parameters according to a specific embodiment of the present invention.

[0043] Figure 8 A schematic diagram is shown of the surface shape error of a glass optical element molded using a compensated molding die corresponding to the compensated molding die parameters according to a specific embodiment of the present invention.

[0044] Figure 9 A schematic diagram of a glass optical element molding die surface shape-optical error compensation device 900 provided according to an embodiment of the present invention is shown. Detailed Implementation

[0045] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0046] Based on the existing ultra-precision molding technology for glass optical components, on the one hand, optical error compensation for the molding die is not considered, resulting in poor optical performance of the molded glass optical components. On the other hand, compensating for and correcting the die by obtaining the surface shape error of the optical component through molding tests requires repeated tests to correct the die, which results in a large number of corrections, high costs, and long cycles.

[0047] To address the aforementioned technical problems, this invention proposes a method for compensating for the surface shape and optical errors of glass optical element molding dies in the field of ultra-precision molding. First, a creep test method based on constant pressure stress, micro-deformation, low-friction disturbance, and axial compression can be used to obtain high-precision high-temperature viscoelastic parameters of glass. Then, a simulation prediction model can be used to accurately simulate and predict the surface shape and optical errors of the molded glass optical element. Second, based on the predicted surface shape and optical errors, the molding die parameters can be simultaneously compensated for both surface shape and optical errors. With the mold after surface shape and optical error compensation, high-precision, high-optical-performance glass optical elements can be molded in one step. This solves the problem of poor optical performance caused by neglecting optical errors, improving the optical performance of the glass optical element. Furthermore, it avoids repeated mold repairs, thereby reducing the number of compensations required for the molding die and lowering the manufacturing cost and cycle time of the molding die.

[0048] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0049] Figure 1 A schematic diagram of a computing device 100 according to an embodiment of the present invention is shown. Figure 1As shown, in a basic configuration, computing device 100 includes at least one processing unit 102 and system memory 104. According to one aspect, depending on the configuration and type of the computing device, the processing unit 102 may be implemented as a processor. System memory 104 includes, but is not limited to, volatile memory (e.g., random access memory), non-volatile memory (e.g., read-only memory), flash memory, or any combination of such memories. According to one aspect, system memory 104 includes an operating system 105.

[0050] According to one aspect, operating system 105 is, for example, suitable for controlling the operation of computing device 100. Furthermore, examples are practiced in conjunction with graphics libraries, other operating systems, or any other applications, and are not limited to any particular application or system. Figure 1 The basic configuration is illustrated by the components within the dashed lines. According to one aspect, the computing device 100 has additional features or functions. For example, according to one aspect, the computing device 100 includes additional data storage devices (removable and / or non-removable), such as disks, optical discs, or magnetic tapes. This additional storage... Figure 1 The middle part is shown by removable storage device 109 and non-removable storage device 110.

[0051] As stated above, according to one aspect, program module 103 is stored in system memory 104. According to one aspect, program module 103 may include one or more applications. The present invention does not limit the type of application; for example, applications may include: email and contact applications, word processing applications, spreadsheet applications, database applications, slideshow applications, drawing or computer-aided applications, web browser applications, etc.

[0052] According to one aspect, program module 103 may include a plurality of program instructions suitable for performing the glass optical element molding die surface shape-optical error compensation method of the present invention, such that computing device 100 is configured to perform the glass optical element molding die surface shape-optical error compensation method of the present invention.

[0053] According to one aspect, program module 103 may include a glass optical element molding die surface shape-optical error compensation device 900, which may be configured to perform the glass optical element molding die surface shape-optical error compensation method of the present invention.

[0054] According to one aspect, examples can be practiced on circuits including discrete electronic components, packaged or integrated electronic chips containing logic gates, circuits utilizing microprocessors, or on a single chip containing electronic components or a microprocessor. For example, it can be practiced via wherein...Figure 1 Each or many of the components shown can be implemented as an example by integrating a System-on-a-Chip (SOC) on a single integrated circuit. According to one aspect, such an SOC device may include one or more processing units, graphics units, communication units, system virtualization units, and various application functions, all integrated (or “burned in”) as a single integrated circuit onto a chip substrate. When operating via the SOC, the functions described herein can be operated via dedicated logic integrated on a single integrated circuit (chip) with other components of the computing device 100. Embodiments of the invention can also be implemented using other techniques capable of performing logical operations (e.g., AND, OR, and NOT), including but not limited to mechanical, optical, fluid, and quantum technologies. Additionally, embodiments of the invention can be implemented within a general-purpose computer or in any other circuit or system.

[0055] According to one aspect, computing device 100 may also have one or more input devices 112, such as a keyboard, mouse, pen, voice input device, touch input device, etc. It may also include output devices 114, such as a display, speaker, printer, etc. The foregoing devices are examples and other devices may also be used. Computing device 100 may include one or more communication connections 116 that allow communication with other computing devices 118. Examples of suitable communication connections 116 include, but are not limited to: RF transmitter, receiver and / or transceiver circuitry; Universal Serial Bus (USB), parallel and / or serial ports.

[0056] As used herein, the term computer-readable medium includes computer storage medium. Computer storage medium can include volatile and non-volatile, removable and non-removable media implemented using any method or technology for storing information (e.g., computer-readable instructions, data structures, or program module 103). System memory 104, removable storage device 109, and non-removable storage device 110 are examples of computer storage media (i.e., memory storage). Computer storage media can include random access memory (RAM), read-only memory (ROM), electrically erasable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical storage, magnetic tape, magnetic tape, disk storage or other magnetic storage devices, or any other article of manufacture that can be used to store information and is accessible by computing device 100. According to one aspect, any such computer storage medium can be part of computing device 100. Computer storage media does not include carrier waves or other transmitted data signals.

[0057] According to one aspect, the communication medium is implemented by computer-readable instructions, data structures, program modules 103, or other data in a modulated data signal (e.g., a carrier wave or other transmission mechanism), and includes any information transmission medium. According to one aspect, the term "modulated data signal" describes a signal having one or more sets of characteristics or altered in a manner that encodes information in the signal. By way of example and not limitation, the communication medium includes wired media such as wired networks or direct wired connections, and wireless media such as acoustic, radio frequency (RF), infrared, and other wireless media.

[0058] In an embodiment of the present invention, a computing device 100 is configured to execute the glass optical element molding die surface shape-optical error compensation method of the present invention. The computing device 100 includes one or more processors and one or more readable storage media storing program instructions, which, when configured to be executed by the one or more processors, cause the computing device to execute the glass optical element molding die surface shape-optical error compensation method of the present invention. By executing the glass optical element molding die surface shape-optical error compensation method of the present invention, surface shape and optical error compensation can be performed on the molding die of the glass optical element (used for ultra-precision molding of glass optical elements).

[0059] Figure 2 A schematic flowchart of a glass optical element molding die surface shape-optical error compensation method 200 according to an embodiment of the present invention is shown. The glass optical element molding die surface shape-optical error compensation method 200 can be executed in a computing device (e.g., the aforementioned computing device 100).

[0060] In embodiments of the present invention, the molding die is used for ultra-precision molding of glass optical elements. Specifically, the glass optical element can be a conventional glass aspherical lens, a double-sided aspherical lens, an aspherical array, or a cylindrical aspherical array. In other words, the surface shape-optical error compensation method 200 for the molding die of the glass optical element according to the present invention can perform surface shape error compensation and optical error compensation on the molding die of conventional glass aspherical lenses, double-sided aspherical lenses, aspherical arrays, or cylindrical aspherical arrays.

[0061] like Figure 2 As shown, the glass optical element molding die surface shape-optical error compensation method 200 includes steps 210 to 250.

[0062] Figure 3 A schematic diagram illustrating the principle of a glass optical element molding die surface shape-optical error compensation method according to an embodiment of the present invention is shown.

[0063] The following will combine Figure 2 andFigure 3 Let's explain steps 210 to 250.

[0064] First, in step 210, a creep test method based on constant pressure stress, micro-deformation, low frictional disturbance, and axial compression can be used to obtain the creep displacement of the glass (i.e., the glass used to fabricate glass optical components), and the high-temperature viscoelastic parameters of the glass can be determined based on the creep displacement. This allows for the acquisition of highly accurate high-temperature viscoelastic parameters of the glass.

[0065] Subsequently, in step 220, an initial glass optical element profile curve equation can be constructed, and the initial molding die parameters can be determined based on the initial glass optical element profile curve equation.

[0066] In embodiments of the present invention, optical design software can be used to design the glass optical element to construct an initial glass optical element profile curve equation. Subsequently, initial molding die parameters can be determined based on the initial glass optical element profile curve equation.

[0067] Next, in step 230, a simulation model of the glass preform under force-thermal coupling can be established based on the initial molding die parameters.

[0068] It should be noted that the glass preform simulation model is a digital representation of the glass preform. The glass preform is the glass material used for molding to obtain glass optical elements. In other words, in this embodiment of the invention, glass optical elements can be obtained by molding the glass preform.

[0069] Then, the initial molding die parameters, glass preform simulation model, and high-temperature viscoelastic parameters of the glass can be input into the simulation prediction model.

[0070] Next, in step 240, a simulation prediction model can be used to simulate the molding process (i.e., the process of molding the glass preform to obtain a glass optical element) based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass. The simulated glass optical element is obtained by molding the glass preform. The surface shape error and optical error of the simulated glass optical element are predicted to obtain the corresponding predicted surface shape error and predicted optical error.

[0071] It should be noted that the predicted surface shape error is the deviation between the simulated glass optical element profile and the initial glass optical element profile.

[0072] In embodiments of the present invention, the compression molding process includes a compression molding stage and an annealing and cooling stage. The specific process of simulating the compression molding process using a simulation prediction model based on initial compression mold parameters, a glass preform simulation model, and high-temperature viscoelastic parameters of the glass is as follows:

[0073] First, the molding process conditions are determined, which may include initial temperature, target temperature, and predetermined molding pressure. Then, based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass, the molding stage of the glass preform is simulated according to the molding process conditions, yielding a pre-formed glass optical element as the molding result. Specifically, the simulation process for the molding stage of the glass preform according to the molding process conditions is as follows: the glass preform simulation model is heated from the initial temperature to the target temperature, then a predetermined molding pressure is applied for molding. After the glass preform simulation model is fully filled, the predetermined molding pressure is removed, and a holding pressure lower than the predetermined molding pressure is applied for holding, yielding the molding result. Furthermore, the molding result (pre-formed glass optical element) is used as the initial conditions for the annealing and cooling stage to simulate the annealing and cooling stage, yielding a simulated glass optical element.

[0074] Finally, in step 250, the initial molding die parameters can be compensated based on the predicted surface shape error and predicted optical error to obtain the compensated molding die parameters, so as to manufacture the compensated molding die based on the compensated molding die parameters. It should be understood that the compensated molding die parameters can be used as the processing parameters for the compensated molding die to manufacture the compensated molding die.

[0075] According to the glass optical element molding die surface shape-optical error compensation method provided in the embodiments of the present invention, firstly, a creep test method based on constant pressure stress micro-deformation low friction disturbance axial compression can be used to obtain high-precision high-temperature viscoelastic parameters of glass. Then, a simulation prediction model can be used to accurately simulate and predict the surface shape error and optical error of the molded glass optical element. Secondly, based on the predicted surface shape error and optical error, the surface shape error and optical error can be compensated for simultaneously on the molding die parameters. With the molding die after surface shape-optical error compensation, a high-precision, high-optical-performance glass optical element can be molded in one step. On the one hand, this solves the problem of poor optical performance of glass optical elements caused by not considering optical errors, thus improving the optical performance of glass optical elements. On the other hand, it avoids repeated mold repairs, thereby reducing the number of compensations for the molding die and reducing the manufacturing cost and cycle of the molding die.

[0076] In some embodiments, the glass optical element is an aspherical glass optical element. Accordingly, the molding die parameters include multiple aspherical coefficients.

[0077] In some embodiments, the creep test method based on constant pressure stress, micro-deformation, low friction disturbance axial compression in step 210 can be performed in the testing apparatus 300. That is, the creep test method based on constant pressure stress, micro-deformation, low friction disturbance axial compression can be performed on the glass using the testing apparatus 300.

[0078] Figure 3 A schematic diagram of a testing apparatus 300 provided according to an embodiment of the present invention is shown.

[0079] like Figure 3 As shown, the testing device 300 is used to perform creep tests on optical glass 305 based on constant pressure stress, micro-deformation, low friction disturbance, and axial compression. The testing device 300 includes: a test housing 301, an infrared or electromagnetic heating device (including a first infrared or electromagnetic heating device 302 and a second infrared or electromagnetic heating device 306), a measuring probe 303, an upper sapphire substrate 304, a lower sapphire substrate 307, a testing platform 309, a sample holder 310, a support frame 311, a constant temperature testing unit 312, a high-precision displacement sensor 313, a parallel guiding system 314, a load application device 315, and calibration weights 316.

[0080] The first infrared or electromagnetic heating device 302, the second infrared or electromagnetic heating device 306, and the second infrared or electromagnetic heating device 306 can all be arranged inside the test housing 301.

[0081] The test platform 309 and the sample holder 310 can be mechanically assembled and installed together on the support frame 311. The test platform 309 is mounted on the upper end of the sample holder 310, and both the upper end of the sample holder 310 and the test platform 309 extend into the test housing 301. The upper part of the measuring probe 303 extends into the test housing 301.

[0082] The high-precision displacement sensor 313, the all-bearing parallel guiding system 314, and the load application device 315 are all installed in the constant-temperature testing unit 312, which avoids the influence of temperature on the sensor unit. It should be noted that before conducting creep tests on glass based on constant-pressure stress, micro-deformation, low-friction disturbance axial compression using this testing device 300, the testing device 300 can be calibrated in advance using calibration weights 316.

[0083] In some embodiments, the creep displacement of glass is obtained using a creep test method based on constant pressure stress, micro-deformation, low friction disturbance, and axial compression as follows.

[0084] First, the surfaces of the optical glass 305 to be tested (i.e., the glass used to fabricate glass optical components), the upper sapphire substrate 304, and the lower sapphire substrate 307 can be ground and polished to form ultra-precise smooth surfaces.

[0085] Subsequently, the polished optical glass 305 is clamped between the upper sapphire substrate 304 and the lower sapphire substrate 307 to form a test module, and the test module is placed at the center of the test platform 309 of the test device 300.

[0086] Furthermore, a creep test method based on constant pressure stress, micro-deformation, low-friction disturbance axial compression can be performed using the testing device 300, specifically as follows: The measuring probe 303 is brought into contact with the upper surface of the sapphire substrate 304. Then, the optical glass 305 is heated using an infrared or electromagnetic heating device, and the heating temperature of the optical glass 305 is detected by a thermocouple temperature sensor 308 to heat the optical glass 305 to its yield point temperature (test temperature) and hold it at that temperature for a predetermined time. Next, a small load is applied to the sapphire substrate 304 using a load application device 315, and the parallel guide system 314 with all bearings ensures that the load applied to the sapphire substrate 304 is in the vertical direction; that is, a small vertical load is applied to the sapphire substrate 304 using the load application device 315 and the parallel guide system 314. Simultaneously with the load application, the creep displacement of the optical glass 305 at the test temperature can be detected and acquired using a high-precision displacement sensor 313.

[0087] It should be noted that the above-mentioned method of applying load can ensure that the axial compressive stress of the glass is constant and undergoes micro-deformation, so that the cross-section of the glass remains unchanged during the axial compression process, achieving low frictional disturbance, which can be approximately equivalent to no frictional disturbance. Thus, it is possible to perform creep test on glass (optical glass 305) based on constant compressive stress, micro-deformation, and low frictional disturbance axial compression.

[0088] Based on this, during the aforementioned creep test of the glass (optical glass 305), the creep displacement of the glass under low frictional disturbance can be obtained by a high-precision displacement sensor 313. Here, the high-precision displacement sensor 313 can achieve micron-level creep displacement detection to obtain high-precision creep displacement of the glass (optical glass 305).

[0089] In some embodiments, the computing device 100 may be communicatively connected to the high-precision displacement sensor 313, which may send the detected creep displacement of the glass to the computing device 100. That is, the computing device 100 may obtain the creep displacement of the glass from the high-precision displacement sensor 313.

[0090] Figure 4 A schematic diagram showing the principle comparison between traditional large strain frictional disturbance creep test and constant pressure stress low frictional disturbance creep test is presented.

[0091] It needs to be further explained that, such as Figure 4As shown, when the glass is tested using the creep test method based on constant compressive stress, micro-deformation, low friction disturbance, and axial compression, only a small load is applied, and the glass undergoes micro-deformation. Furthermore, due to the ultra-smooth surfaces between the upper sapphire substrate 304, the lower sapphire substrate 307, and the optical glass 305, the friction is close to zero (μ≈0). Therefore, the shape of the optical glass can always remain cylindrical, and the cross-sectional area remains unchanged. At this time, the compressive stress on the glass is constant.

[0092] In the traditional large-load, large-strain frictional perturbation creep test, the presence of friction (μ>0) causes the strain region of the glass to be drum-shaped during the test, increasing the cross-sectional area compared to before the test. Furthermore, the compressive stress decreases as the test time increases, resulting in a large error in the obtained creep displacement. Friction needs to be considered and the creep correction needs to be made. However, there will also be cumulative errors in the friction test process, which will affect the accuracy of the creep displacement solution.

[0093] In some embodiments, in step 210, after obtaining the creep displacement of the glass using a creep test method based on constant pressure stress, micro-deformation, low frictional disturbance, and axial compression, a stress relaxation model can be constructed based on the creep displacement, and the high-temperature viscoelastic parameters of the glass can be determined based on the stress relaxation model. The viscoelastic parameters of the glass include the shear modulus G(t) and the shear stress relaxation time τ. i .

[0094] The specific process of constructing a stress relaxation model based on creep displacement is as follows.

[0095] First, we can determine the compressive stress σ acting on the glass. z And the initial glass height L0, the real-time glass height L during creep compression. z The creep compliance J(t) of glass creep compression can be calculated from the relationship between (t). Specifically, the creep compliance can be calculated according to the following formula (1):

[0096] J(t) = -ln(L z (t) / L0) / σ z (1)

[0097] In the above formula, J(t) represents the creep compliance of glass under creep compression, and σ z L represents the compressive stress on the glass, L0 represents the initial height of the glass, and L... z (t) represents the real-time height of the glass during the creep compression process.

[0098] In creep compression based on constant pressure stress, the relationship between the shear modulus G(t) and creep compliance J(t) of glass after Laplace transformation can be expressed as follows (2):

[0099]

[0100] In the above formula, This represents the relaxation modulus. Furthermore, the Kelvin-Voigt model can be used to fit the creep compliance test data, and the creep compliance function J... z (t) can be expressed as the following equation (3):

[0101]

[0102] Where E is the temperature-dependent Young's modulus. E0 is the Young's modulus of glass at room temperature, E i and λ i These represent the relaxation time of the elastic modulus for each Kelvin component.

[0103] By analyzing the creep compliance function J z After performing a Laplace transform on (t), the relaxation modulus can be obtained. and The relationship between them is as follows (4):

[0104]

[0105] Based on the above relaxation modulus and Performing an inverse Laplace transform on the relationship between the two, we can obtain the shear modulus G(t) of the glass. The shear modulus G(t) of the glass can be expressed in Prony series form:

[0106]

[0107] τ i =η i / G i (6)

[0108] In the above formula, τ i G is the shear stress relaxation time. i For the shear modulus component, G ∞ This is the long-term shear modulus.

[0109] The instantaneous shear modulus G0 can be expressed as:

[0110]

[0111] Thus, the stress relaxation model can be obtained, including equations (1)-(7) above.

[0112] Furthermore, by fitting the stress relaxation model, high-precision viscoelastic parameters of the glass can be obtained. These parameters include the shear modulus G(t) and the shear stress relaxation time τ. i .

[0113] In some embodiments, during the simulation prediction process using a simulation prediction model, the predicted surface shape error and predicted optical error of the simulated glass optical element can be predicted in the following ways.

[0114] To determine the predicted surface shape error of a simulated glass optical element, an interpolation method can be used to fit the node coordinates of the simulated glass optical element and the node coordinates of the initial molding die corresponding to the initial molding die parameters. This fitting method helps to identify the predicted surface shape error (i.e., the deviation between the simulated glass optical element profile and the initial glass optical element profile). Specifically, nodes on the simulated glass optical element and nodes on the initial molding die corresponding to the initial molding die parameters can be extracted radially and fitted to calculate the predicted surface shape error.

[0115] It should be noted that the residual stress in glass optical components during the annealing and cooling stage can affect their optical properties (such as refractive index). Therefore, the predicted optical error of simulated glass optical components includes the glass refractive index of the simulated glass optical components, and the predicted optical error can be obtained by predicting the glass refractive index of the simulated glass optical components.

[0116] Specifically, to predict optical errors in simulated glass optical components, a volume change-refractive index model of the glass optical component during the annealing and cooling stage can be constructed first. This model is used to simulate the volume and refractive index changes of the glass optical component during the annealing and cooling stage.

[0117] The volume change-refractive index model for glass optical elements is as follows:

[0118]

[0119] n c =n + Δn (9)

[0120] In the above formula, V0 represents the initial volume of the pre-formed glass optical element before annealing and cooling, V c This represents the final volume of the simulated glass optical element after annealing and cooling. n represents the initial refractive index of the pre-formed glass optical element before annealing and cooling. c This indicates the final refractive index of the simulated glass optical element after annealing and cooling.

[0121] Furthermore, by solving the volume change-refractive index model of the glass element, the final refractive index (n) of the simulated glass optical element can be obtained. c The final refractive index is then used as the glass refractive index of the simulated glass optical element. Here, the glass refractive index of the simulated glass optical element, that is, the glass refractive index of the simulated glass optical element coupled by residual stress, can be used as the predicted optical error of the simulated glass optical element.

[0122] In step 250, the specific method for compensating the initial molding die parameters based on the predicted surface shape error and the predicted optical error is as follows:

[0123] First, optical error compensation can be performed on the initial glass optical element profile curve equation based on the glass refractive index of the simulated glass optical element (i.e., the predicted optical error), resulting in the first glass optical element profile curve equation after optical error compensation (i.e., the glass optical element profile curve equation after optical error compensation). Then, based on the first glass optical element profile curve equation, the corresponding first compensated molding die parameters (i.e., the molding die parameters after optical error compensation) can be determined.

[0124] Furthermore, surface shape error compensation can be performed based on the first glass optical element contour curve equation and the first compensation molding die parameters obtained after optical error compensation.

[0125] Specifically, a surface shape error compensation model can be constructed based on the predicted surface shape error and the contour curve equation of the first compensating glass optical element. Subsequently, a compensation factor can be determined based on the surface shape error compensation model. Furthermore, surface shape error compensation can be performed on the parameters of the first compensating molding die based on the compensation factor to obtain the compensated molding die parameters.

[0126] Furthermore, after determining the compensation factor, the contour curve equation of the first compensation glass optical element can be compensated based on the compensation factor to obtain the contour curve equation of the second compensation glass optical element. Then, the corresponding second compensation molding die parameters (i.e., the compensated molding die parameters) can be determined based on the contour curve equation of the second compensation glass optical element.

[0127] In one embodiment, the glass optical element is an aspherical glass optical element. The specific method for constructing the surface shape error compensation model is as follows.

[0128] First, the aspherical equation of the aspherical glass optical element can be established as the equation for the profile curve of the glass optical element, as follows:

[0129]

[0130] Subsequently, assuming the compensation factor is α, the higher-order coefficients of the second glass optical element profile curve equation obtained after compensating the first glass optical element profile curve equation based on the compensation factor α can be expressed as:

[0131]

[0132] In the above formula, A ia The coefficients of the higher-order terms in the equation for the profile curve of the second glass optical element obtained after compensation.ib denoted as the coefficient of the equation for the profile curve of the first glass optical element.

[0133] Furthermore, the conic coefficient k and the reciprocal of the radius of curvature c in the equation of the glass optical element profile curve can be expressed as follows:

[0134] k ia =k ib (1+α) i-1 ,i=1 (12)

[0135] c a =c b (1+α) (13)

[0136] In the above formula, k ia c a These represent the conic coefficient and radius of curvature of the contour curve equation of the second glass optical element obtained after compensation. id c b These are the conic coefficient and radius of curvature of the contour curve equation of the first glass optical element, respectively.

[0137] Furthermore, by discretizing the contour curve equations of the first and second glass optical elements within the effective radius, the discretized contour curve equations of the glass optical elements at the maximum radius after compensation can be obtained, as follows:

[0138]

[0139] The surface shape accuracy shrinkage deformation compensation amount for glass optical elements is:

[0140] PV 预补 =Z amax -Z bmax =PV sim -PV object (15)

[0141] In the above formula, Z amax Z bmax These are the Z-axis height values ​​before and after compensation, respectively. PVsim and PV object These are the predicted surface shape error obtained from simulation and the target surface shape error that needs to be compensated, respectively.

[0142] Based on equations (10)-(15), the surface shape error compensation model can be obtained.

[0143] By solving the above surface error compensation model, the value of the compensation factor α can be obtained. Then, based on this compensation factor, surface error compensation can be performed on the parameters of the first compensation molding die to obtain the compensated molding die parameters (aspherical parameters). Specifically, the contour curve equation of the first compensation glass optical element can be compensated based on the compensation factor to obtain the contour curve equation of the second compensation glass optical element, and the compensated molding die parameters can be determined based on the contour curve equation of the second compensation glass optical element.

[0144] It should be understood that the compensated molding die parameters are the molding die parameters obtained after optical error compensation and surface shape error compensation. These compensated molding die parameters can be directly used as the processing parameters of the molding die.

[0145] also, Figure 5 A schematic flowchart of a glass optical element molding die surface shape-optical error compensation method 500 according to some embodiments of the present invention is shown. Method 500 can be executed in the aforementioned computing device 100.

[0146] like Figure 5 As shown, the glass optical element molding die surface shape-optical error compensation method 500 includes steps 510 to 580. The following is in conjunction with... Figure 5 Let's explain steps 510 to 580.

[0147] Step 510: Using a creep test method based on constant pressure stress, micro-deformation, low frictional disturbance, and axial compression, the creep displacement of the glass (i.e., the glass used to fabricate glass optical components) is obtained, and the high-temperature viscoelastic parameters of the glass are determined based on the creep displacement. This allows for the acquisition of highly accurate high-temperature viscoelastic parameters of the glass.

[0148] Step 520: Construct the initial glass optical element profile curve equation, and determine the initial molding die parameters based on the initial glass optical element profile curve equation.

[0149] In some embodiments, optical design software can be used to design the glass optical element to construct an initial glass optical element profile curve equation. Subsequently, initial molding die parameters can be determined based on the initial glass optical element profile curve equation.

[0150] Step 530: Based on the initial molding die parameters, establish a simulation model of the glass preform under force-thermal coupling.

[0151] It should be noted that the glass preform simulation model is a digital representation of the glass preform. The glass preform is the glass material used for molding to obtain glass optical elements. In other words, in this embodiment of the invention, glass optical elements can be obtained by molding the glass preform.

[0152] Then, the initial molding die parameters, glass preform simulation model, and high-temperature viscoelastic parameters of the glass can be input into the simulation prediction model.

[0153] Step 540: Using a simulation prediction model, based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass, the molding process (i.e., the process of molding the glass preform to obtain a glass optical element) is simulated to obtain a simulated glass optical element, and the surface shape error and optical error of the simulated glass optical element are predicted to obtain the corresponding predicted surface shape error and predicted optical error.

[0154] It should be noted that the predicted surface shape error is the deviation between the simulated glass optical element profile and the initial glass optical element profile.

[0155] Step 550: Compensate the initial molding die parameters based on the predicted surface shape error and predicted optical error to obtain the compensated molding die parameters, so as to manufacture the compensated molding die based on the compensated molding die parameters.

[0156] It should be understood that the parameters of the compensated molding die can be used as the processing parameters of the compensated molding die for manufacturing the compensated molding die.

[0157] It should be noted that the compensated molding die is used for molding tests to obtain the test surface shape error and test optical error of the glass optical element after the test.

[0158] After executing step 550, computing device 100 may continue to execute the following steps 560-580:

[0159] Step 560: The computing device 100 can determine the test surface shape error and test optical error of the glass optical element obtained by molding the glass optical element after the test using the compensated molding die.

[0160] Step 570: The computing device 100 determines whether the test surface shape error and the test optical error are less than the surface shape error threshold and the optical error threshold, respectively. If yes (determining that the above simulation prediction model meets the compensation accuracy requirements), then the above simulation prediction model is directly used as the final simulation prediction model, and the following steps are not required. If no, then proceed to step 580.

[0161] Step 580: The computing device 100 corrects the simulation prediction model based on the experimental surface shape error and experimental optical error of the glass optical element after the experiment, and obtains the corrected simulation prediction model.

[0162] Next, based on the revised simulation prediction model, we can return to step 540 above and iteratively execute steps 540 to 580.

[0163] Specifically, in step 540, the computing device 100 can use the revised simulation prediction model to simulate the molding process based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass to obtain a simulated glass optical element, and predict the surface shape error and optical error of the simulated glass optical element to obtain the corresponding predicted surface shape error and predicted optical error.

[0164] Subsequently, in step 550, the computing device 100 can compensate the initial molding die parameters based on the predicted surface error and the predicted optical error to obtain the compensated molding die parameters, so as to manufacture the compensated molding die based on the compensated molding die parameters.

[0165] Next, in step 560, the computing device 100 can determine the test surface shape error and test optical error of the glass optical element obtained by performing a molding test using a compensated molding die.

[0166] In step 570, the computing device 100 determines whether the experimental surface shape error and experimental optical error are less than the surface shape error threshold and optical error threshold, respectively. If yes (determining that the corrected simulation prediction model meets the compensation accuracy requirements), then the corrected simulation prediction model is used as the final simulation prediction model, and the following steps are unnecessary. If no, then proceed to step 580.

[0167] In step 580, the computing device 100 corrects the simulation prediction model based on the experimental surface shape error and experimental optical error of the glass optical element after the experiment, and obtains the simulation prediction model after secondary correction.

[0168] By iteratively executing steps 540 to 580 above, the compensation accuracy of the simulation prediction model can be continuously improved until the test surface shape error and test optical error of the glass optical element are less than the surface shape error threshold and optical error threshold, respectively. Then, the simulation prediction model after the last correction can be used as the final simulation prediction model, and the corresponding compensated molding die parameters can be used as the final molding die parameters. The final molding die can be made based on the final molding die parameters.

[0169] It should be noted that the present invention, based on the final simulation prediction model, can accurately predict the surface shape error and optical error of glass optical elements, thereby enabling accurate compensation of molding die parameters and improving compensation accuracy.

[0170] The following uses K-PSFn214P optical glass as an example to introduce a specific embodiment of the present invention.

[0171] In one specific embodiment, glass optical elements can be fabricated based on K-PSFn214P optical glass. The transition temperature (Tg) of K-PSFn214P optical glass is 427°C. In this embodiment, K-PSFn214P optical glass can be processed into a cylindrical shape with a diameter of φ5mm and a height of 3mm to obtain a K-PSFn214P glass preform. This K-PSFn214P glass preform is then used as the optical glass to be tested, and creep tests based on constant pressure stress, micro-deformation, low friction disturbance axial compression are performed in the testing device 300.

[0172] In this specific embodiment, the diameter of the selected sapphire upper substrate and the sapphire lower substrate are both 10mm, and the thickness is both 1mm.

[0173] Before conducting creep tests, the upper and lower surfaces of the K-PSFn214P glass preform can be polished to Ra2nm. Furthermore, the upper and lower sapphire substrates can be ultra-precisely polished to an ultra-smooth surface.

[0174] Subsequently, the K-PSFn214P glass preform can be clamped between the upper sapphire substrate 304 and the lower sapphire substrate 307 to form a test module, which is then placed at the center of the test platform 309. Afterwards, the K-PSFn214P glass preform can be heated to test temperatures of 450℃, 460℃, and 470℃ respectively using infrared or electromagnetic heating devices, and held at these temperatures for 10 minutes. For each test temperature, a load of 0.2N can be applied to the upper sapphire substrate 304 using a load application device 315, and the parallel guide system 314 with all bearings ensures that the load applied to the upper sapphire substrate 304 is vertical. Furthermore, for each test temperature, while applying the load, a high-precision displacement sensor 313 can detect and record the creep displacement (creep displacement with low frictional disturbance) of the K-PSFn214P glass preform at the test temperature; this is the creep displacement of the K-PSFn214P optical glass at the test temperature.

[0175] Furthermore, a stress relaxation model can be constructed based on the creep displacement of K-PSFn214P optical glass at the test temperature, and the high-temperature viscoelastic parameters (including shear modulus and shear stress relaxation time) of K-PSFn214P optical glass at the test temperature can be determined based on the stress relaxation model. The specific process for constructing the stress relaxation model can be found in the description in the above embodiments, and will not be repeated here.

[0176] The high-temperature viscoelastic parameters of K-PSFn214P optical glass at different test temperatures are shown in Table 1 below.

[0177] Table 1. High-temperature viscoelastic parameters of K-PSFn214P optical glass at different test temperatures.

[0178]

[0179]

[0180] In this specific embodiment, the glass optical element is an aspherical glass optical element (aspherical lens). Optical design software can be used to design the glass optical element to construct an initial glass optical element profile curve equation. Subsequently, the initial molding die parameters can be determined based on the initial glass optical element profile curve equation. The effective diameter of the initial molding die is 19 mm. The initial molding die parameters include several aspherical coefficients, as shown in Table 2.

[0181] Table 2 Initial Molding Die Parameters

[0182]

[0183] In this specific embodiment, based on the initial molding die parameters, the diameter of the glass preform simulation model under force-thermal coupling is φ14mm. The molding die is made of J05 tungsten carbide.

[0184] In simulating the compression molding process using a simulation prediction model, the molding process conditions can be set as follows: initial temperature 25℃, target temperature 470℃, and predetermined molding pressure 779.31N. Specifically, the simulation process is as follows: the glass preform simulation model is heated from 25℃ to 470℃, and then a molding pressure of 779.31N is applied for molding. After the glass preform simulation model is fully filled, the predetermined molding pressure is removed, and a holding pressure lower than the predetermined molding pressure is applied for holding pressure to obtain the molding result. Then, the molding result is used as the initial condition for the annealing and cooling stage to simulate the annealing and cooling stage. After the annealing and cooling stage simulation is completed, the simulated glass optical element can be obtained.

[0185] Figure 6 A schematic diagram of the predicted surface shape error of a simulated glass optical element (aspherical lens) according to a specific embodiment of the present invention is shown.

[0186] After the simulation of the annealing and cooling stage is completed, such as Figure 6 As shown, nodes on the simulated glass optical element and nodes on the initial molding die can be extracted along the radial direction and fitted to calculate the profile deviation between the simulated glass optical element and the initial glass optical element at the maximum radius, which serves as the predicted surface shape error of the simulated glass optical element (aspherical lens). The predicted surface shape error calculated here is PV 7.187μm.

[0187] In this specific embodiment, the final refractive index of the simulated glass optical element can be calculated based on the volume change-refractive index model of the glass optical element during the annealing and cooling stage described above. c =2.14607, and this final refractive index is used as the glass refractive index (K-PSFn214P optical glass refractive index) to perform optical error compensation design on the initial glass optical element. That is, optical error compensation is performed on the contour curve equation of the initial glass optical element based on the glass refractive index to obtain the first glass optical element contour curve equation after optical error compensation (i.e., the glass optical element contour curve equation after optical error compensation). Then, based on the first glass optical element contour curve equation, the corresponding first compensation molding die parameters (i.e., the molding die parameters after optical error compensation) are determined.

[0188] Figure 7 A schematic diagram is shown of the surface shape error of a glass optical element molded using an initial molding die corresponding to uncompensated initial molding die parameters according to a specific embodiment of the present invention.

[0189] It should be noted that, as Figure 7 As shown, under the same molding process conditions, the actual surface shape error PV of the glass optical element molded using the initial molding die with uncompensated initial molding die parameters is 6.5134μm, which is close to the predicted surface shape error PV of 7.187μm obtained from the above simulation prediction, thus verifying the accuracy of the parameters input to the simulation prediction model.

[0190] In this specific embodiment, the predicted surface shape error obtained from simulation prediction ( PVsim The target surface shape error (PV) needs to be compensated for, which is PV 7.187μm. object The surface error is 0.7 μm. Based on the aforementioned surface error compensation model, the compensation factor α can be calculated to be 0.001. Furthermore, surface error compensation can be performed on the first compensation molding die parameters based on this compensation factor to obtain the compensated molding die parameters (aspherical parameters). Specifically, the contour curve equation of the first compensation glass optical element can be compensated based on this compensation factor to obtain the contour curve equation of the second compensation glass optical element, and the compensated molding die parameters can be determined based on the contour curve equation of the second compensation glass optical element.

[0191] The compensated molding die parameters include multiple correction coefficients (i.e., compensated aspherical coefficients), as shown in Table 3.

[0192] Table 3 Parameters of the compression mold after compensation

[0193]

[0194] Figure 8 A schematic diagram is shown of the surface shape error of a glass optical element molded using a compensated molding die corresponding to the compensated molding die parameters in a specific embodiment of the present invention.

[0195] In one specific embodiment, after determining the parameters of the compensated molding die, a corresponding compensated molding die can be fabricated based on these parameters. Then, using the compensated molding die, a molding experiment can be conducted under molding process conditions of a target temperature of 470°C and a predetermined molding pressure of 779.31N. The surface accuracy of the resulting glass optical element (aspherical glass optical element) after the molding experiment can be measured. Figure 8 As shown, the surface shape error (PV) of the glass optical element after the experiment was 0.6186 μm. It is evident that the compensated molding die designed in this invention, through surface shape-optical error compensation, can mold a glass optical element that meets the requirements for surface shape accuracy and optical performance in a single operation, avoiding repeated mold repairs.

[0196] According to the glass optical element molding die surface shape-optical error compensation method of the present invention, a creep test method based on constant pressure stress micro-deformation low friction disturbance axial compression is used to obtain the high-temperature viscoelastic parameters of glass. By constructing the initial glass optical element contour curve equation, the initial molding die parameters are determined, and a glass preform simulation model under force-thermal coupling is established. Then, the simulation prediction model is used to simulate and predict the surface shape error and optical error of the glass optical element based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of glass. The predicted surface shape error and optical error compensate the initial molding die parameters, and the compensated molding die can be manufactured based on the compensated molding die parameters. According to the technical solution of the present invention, firstly, a creep test method based on constant pressure stress micro-deformation low friction disturbance axial compression can be used to obtain high-precision high-temperature viscoelastic parameters of glass. Then, a simulation prediction model can be used to accurately simulate and predict the surface shape error and optical error of the molded glass optical element. Secondly, based on the predicted surface shape error and optical error, the surface shape error and optical error compensation can be performed on the molding die parameters simultaneously. With the molding die after surface shape-optical error compensation, a high-precision, high-optical-performance glass optical element can be molded in one step. On the one hand, this solves the problem of poor optical performance of glass optical elements caused by not considering optical errors, thus improving the optical performance of glass optical elements. On the other hand, it avoids repeated mold repairs, thereby reducing the number of compensations for the molding die and reducing the manufacturing cost and cycle of the molding die.

[0197] Furthermore, this invention can continuously refine the simulation prediction model based on the experimental surface shape error and experimental optical error of the glass optical element after testing, thereby continuously improving the compensation accuracy of the simulation prediction model. The final simulation prediction model obtained after multiple refinements can achieve higher-precision simulation prediction of the surface shape error and optical error of the glass optical element, thereby enabling precise compensation of the molding die parameters and improving compensation accuracy.

[0198] Furthermore, the glass optical element molding die surface shape-optical error compensation method according to the present invention is applicable to the compensation of conventional glass aspherical lenses, double-sided aspherical lenses, aspherical arrays, or columnar aspherical arrays of different sizes. It has wide adaptability. Based on the compensation, the molding die can improve the surface shape accuracy, optical performance, and consistency of the molded glass optical element, meeting the needs of aerospace, biomedicine, defense, 5G+AI, new energy vehicle and other industries for the mass and efficient manufacturing of glass optical elements, and has broad application prospects.

[0199] Figure 9 A schematic diagram of a glass optical element molding die surface shape-optical error compensation device 900 according to an embodiment of the present invention is shown. The glass optical element molding die surface shape-optical error compensation device 900 can be deployed in a computing device 100, and the glass optical element molding die surface shape-optical error compensation device 900 can be configured to perform the glass optical element molding die surface shape-optical error compensation method 200 and / or 500 of the present invention.

[0200] like Figure 9 As shown, in an embodiment of the present invention, the glass optical element molding die surface shape-optical error compensation device 900 includes an acquisition unit 910, a construction unit 920, an establishment unit 930, a simulation prediction unit 940, a compensation unit 950, a determination unit 960, a judgment unit 970, and a correction unit 980 that are sequentially connected in communication.

[0201] Among them, the acquisition unit 910 can use the creep test method based on constant pressure stress micro-deformation low friction disturbance axial compression to obtain the creep displacement of the glass, and determine the high temperature viscoelastic parameters of the glass based on the creep displacement.

[0202] The construction unit 920 is used to construct the initial glass optical element profile curve equation and determine the initial molding die parameters based on the initial glass optical element profile curve equation.

[0203] The 930 unit can establish a simulation model of a glass preform under force-thermal coupling based on the initial molding die parameters.

[0204] The simulation prediction unit 940 can use the simulation prediction model to simulate the molding process based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass to obtain a simulated glass optical element, and predict the surface shape error and optical error of the simulated glass optical element to obtain the corresponding predicted surface shape error and predicted optical error.

[0205] The compensation unit 950 can compensate the initial molding die parameters based on the predicted surface error and the predicted optical error to obtain the compensated molding die parameters, so as to manufacture the compensated molding die based on the compensated molding die parameters.

[0206] In addition, in some embodiments, the compensated molding die is used to perform molding tests to obtain the test surface shape error and test optical error of the glass optical element after the test.

[0207] The determining unit 960 can determine the test surface shape error and test optical error of the glass optical element obtained by molding with a compensated molding die after the test.

[0208] The judgment unit 970 can determine whether the test surface shape error and the test optical error are less than the surface shape error threshold and the optical error threshold, respectively.

[0209] If the test surface shape error is not less than the surface shape error threshold or the test optical error is not less than the optical error threshold, the correction unit 980 can correct the simulation prediction model based on the test surface shape error and test optical error of the glass optical element after the test, and obtain the corrected simulation prediction model.

[0210] The simulation prediction unit 940 can also use the revised simulation prediction model to simulate the molding process based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass to obtain a simulated glass optical element, and predict the surface shape error and optical error of the simulated glass optical element to obtain the corresponding predicted surface shape error and predicted optical error.

[0211] The compensation unit 950 can also compensate the initial molding die parameters based on the predicted surface error and predicted optical error to obtain the compensated molding die parameters, so as to manufacture the compensated molding die based on the compensated molding die parameters. Until the experimental surface error and experimental optical error of the glass optical element are less than the surface error threshold and optical error threshold respectively after the test, the current corrected simulation prediction model can be used as the final simulation prediction model.

[0212] It should be noted that the specific execution logic of each unit can be found in the description of each step in Method 200 / 500 above, and will not be repeated here.

[0213] The various techniques described herein can be implemented in combination with hardware or software, or a combination thereof. Thus, the methods and apparatus of the present invention, or certain aspects or portions thereof, can take the form of program code (i.e., instructions) embedded in a tangible medium, such as a removable hard disk, USB flash drive, floppy disk, CD-ROM, or any other machine-readable storage medium, wherein when the program is loaded into and executed by a machine such as a computer, the machine becomes an apparatus for practicing the present invention.

[0214] When the program code is executed on a programmable computer, the mobile terminal generally includes a processor, a processor-readable storage medium (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device. The memory is configured to store program code; the processor is configured to execute the glass optical element molding die surface shape-optical error compensation method of the present invention according to instructions in the program code stored in the memory.

[0215] By way of example, and not limitation, readable media include readable storage media and communication media. Readable storage media stores information such as computer-readable instructions, data structures, program modules, or other data. Communication media generally embodies computer-readable instructions, data structures, program modules, or other data in the form of modulated data signals such as carrier waves or other transmission mechanisms, and includes any information delivery medium. Any combination of the above is also included within the scope of readable media.

[0216] In the specification provided herein, the algorithms and displays are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used with the examples of this invention. The required structure for constructing such systems is apparent from the above description. Furthermore, this invention is not directed to any particular programming language. It should be understood that the contents of the invention described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing the best mode of implementation of the invention.

[0217] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0218] Similarly, it should be understood that, in order to streamline this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof.

[0219] Those skilled in the art will understand that modules, units, or components of the devices disclosed in the examples herein can be arranged in the devices described in this embodiment, or alternatively, can be located in one or more devices different from the devices in this example. The modules in the foregoing examples can be combined into a single module or, in addition, can be divided into multiple sub-modules.

[0220] Unless otherwise specified, the use of ordinal numbers such as “first,” “second,” “third,” etc., to describe ordinary objects merely indicates different instances of similar objects and is not intended to imply that the objects being described must have a given order in time, space, ordering, or any other manner.

Claims

1. A method for compensating for optical errors in the surface shape of a glass optical element molding die, executed in a computing device, comprising: The creep displacement of glass is obtained by using a creep test method based on constant pressure stress micro-deformation low friction disturbance axial compression, and the high temperature viscoelastic parameters of glass are determined based on the creep displacement. Construct an initial glass optical element profile curve equation, and determine the initial molding die parameters based on the initial glass optical element profile curve equation. Based on the initial molding die parameters, a simulation model of the glass preform under force-thermal coupling is established. Using a simulation prediction model, based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass, a simulated glass optical element is obtained by simulating the molding process. The surface shape error and optical error of the simulated glass optical element are then predicted, yielding corresponding predicted surface shape errors and predicted optical errors. The predicted optical errors include the glass refractive index. Predicting the surface shape error and optical error of the simulated glass optical element involves: using interpolation to fit the node coordinates of the simulated glass optical element and the node coordinates of the initial molding die corresponding to the initial molding die parameters to determine the predicted surface shape error of the simulated glass optical element; constructing a volume change-refractive index model of the glass optical element during the annealing and cooling stage, which is used to simulate the volume and refractive index changes of the glass optical element during the annealing and cooling stage; and solving the volume change-refractive index model to obtain the final refractive index of the simulated glass optical element, which is then used as the glass refractive index of the simulated glass optical element. The initial molding die parameters are compensated based on the predicted surface error and predicted optical error to obtain compensated molding die parameters, so that a compensated molding die can be manufactured based on the compensated molding die parameters. The process of compensating the initial molding die parameters based on the predicted surface error and predicted optical error to obtain the compensated molding die parameters includes: compensating for optical errors in the initial glass optical element profile curve equation based on the glass refractive index to obtain a first compensated glass optical element profile curve equation; determining first compensated molding die parameters based on the first compensated glass optical element profile curve equation; constructing a surface error compensation model based on the predicted surface error and the first compensated glass optical element profile curve equation; determining a compensation factor based on the surface error compensation model; and compensating for surface errors in the first compensated molding die parameters based on the compensation factor to obtain the compensated molding die parameters.

2. The method as described in claim 1, wherein, The compensated molding die is used for molding tests to obtain the test surface shape error and test optical error of the glass optical element after the test; the method further includes the following steps: The test surface shape error and test optical error of the glass optical element obtained by molding using the compensated molding die were determined. Determine whether the test surface shape error and test optical error are less than the surface shape error threshold and optical error threshold, respectively. If not, then: Based on the experimental surface shape error and experimental optical error of the glass optical element after the experiment, the simulation prediction model is corrected to obtain the corrected simulation prediction model. Using the revised simulation prediction model, based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass, the molding process is simulated to obtain a simulated glass optical element. The surface shape error and optical error of the simulated glass optical element are then predicted to obtain the corresponding predicted surface shape error and predicted optical error. The initial molding die parameters are compensated based on the predicted surface shape error and predicted optical error to obtain the compensated molding die parameters, so as to manufacture the compensated molding die based on the compensated molding die parameters. The above steps are iteratively executed until the experimental surface shape error and experimental optical error of the glass optical element are less than the surface shape error threshold and optical error threshold, respectively. Then, the simulation prediction model that has been corrected is taken as the final simulation prediction model.

3. The method as described in claim 1, wherein, The compression molding process includes a compression molding stage and an annealing and cooling stage; Based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass, the molding process is simulated to obtain a simulated glass optical element, including: Determine the molding process conditions, including the initial temperature, target temperature, and predetermined molding pressure; Based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass, and according to the molding process conditions, the molding stage of the glass preform is simulated to obtain the initial glass optical element as the molding result. The molding results are used as the initial conditions for the annealing and cooling stage to simulate the annealing and cooling stage, thereby obtaining a simulated glass optical element.

4. The method according to any one of claims 1-3, wherein, Based on the compensation factor, the surface shape error of the first compensated molding die parameters is compensated to obtain the compensated molding die parameters, including: The first compensation glass optical element profile curve equation is compensated based on the compensation factor to obtain the second compensation glass optical element profile curve equation. Based on the contour curve equation of the second compensation glass optical element, the parameters of the compensation molding die are determined.

5. The method according to any one of claims 1-3, wherein, The creep displacement of glass is obtained using a creep testing method based on constant pressure stress, micro-deformation, and low-friction disturbance axial compression, including: The surfaces of the glass, the upper sapphire substrate, and the lower sapphire substrate to be tested are ground and polished respectively. The polished glass is then clamped between the upper and lower sapphire substrates to form a test module. The test module is then placed at the center of the test platform of the test device. The creep test method based on constant pressure stress, micro-deformation, low friction disturbance axial compression is performed using the test apparatus, including: The measuring probe is brought into contact with the upper surface of the sapphire substrate, and the glass is heated to the test temperature by an infrared or electromagnetic heating device, and then held at that temperature for a predetermined time. A vertical load is applied to the sapphire substrate using a load application device and a parallel guiding system; The creep displacement of the glass at the test temperature is obtained using a high-precision displacement sensor.

6. The method according to any one of claims 1-3, wherein, Determining the high-temperature viscoelastic parameters of glass based on the creep displacement includes: A stress relaxation model is constructed based on the creep displacement, and the high-temperature viscoelastic parameters of the glass are determined based on the stress relaxation model. The high-temperature viscoelastic parameters of the glass include shear modulus and shear stress relaxation time.

7. The method according to any one of claims 1-3, wherein, The glass optical element is a glass aspherical lens, a double-sided aspherical lens, an aspherical array, or a cylindrical aspherical array.

8. The method according to any one of claims 1-3, wherein, Constructing the initial glass optical element profile equation includes: Using optical design software, the initial glass optical element profile curve equation is constructed.

9. The method according to any one of claims 1-3, wherein, The volume change-refractive index model of the glass optical element is as follows: in, V 0 This indicates the initial volume of the pre-formed glass optical element before annealing and cooling. V c This indicates the final volume of the simulated glass optical element after annealing and cooling. n This indicates the initial refractive index of the pre-formed glass optical element before annealing and cooling. n c This indicates the final refractive index of the simulated glass optical element after annealing and cooling.

10. A glass optical element molding die surface shape-optical error compensation device, deployed in a computing device, the device comprising: The acquisition unit is adapted to acquire the creep displacement of glass using a creep test method based on constant pressure stress micro-deformation low friction disturbance axial compression, and to determine the high temperature viscoelastic parameters of the glass based on the creep displacement. The construction unit is suitable for constructing an initial glass optical element profile curve equation and determining the initial molding die parameters based on the initial glass optical element profile curve equation. The unit is designed to establish a simulation model of a glass preform under force-thermal coupling based on the initial molding die parameters. The simulation prediction unit is adapted to use a simulation prediction model to simulate the molding process of a simulated glass optical element based on the initial molding die parameters, the glass preform simulation model, and the high-temperature viscoelastic parameters of the glass. It then predicts the surface shape error and optical error of the simulated glass optical element, obtaining corresponding predicted surface shape error and predicted optical error. The predicted optical error includes the glass refractive index. The simulation prediction unit is further adapted to: use interpolation to fit the node coordinates of the simulated glass optical element and the node coordinates of the initial molding die corresponding to the initial molding die parameters to determine the predicted surface shape error of the simulated glass optical element; construct a volume change-refractive index model of the glass optical element during the annealing and cooling stage, which is used to simulate the volume and refractive index changes of the glass optical element during the annealing and cooling stage; and obtain the final refractive index of the simulated glass optical element by solving the volume change-refractive index model, using the final refractive index as the glass refractive index of the simulated glass optical element. The compensation unit is adapted to compensate the initial molding die parameters based on the predicted surface error and the predicted optical error to obtain compensated molding die parameters, so as to manufacture the compensated molding die based on the compensated molding die parameters. The compensation unit is further adapted to: perform optical error compensation on the initial glass optical element profile curve equation based on the glass refractive index to obtain a first compensated glass optical element profile curve equation; determine the first compensated molding die parameters based on the first compensated glass optical element profile curve equation; construct a surface error compensation model based on the predicted surface error and the first compensated glass optical element profile curve equation; determine a compensation factor based on the surface error compensation model; and perform surface error compensation on the first compensated molding die parameters based on the compensation factor to obtain the compensated molding die parameters.

11. The apparatus of claim 10, wherein, The compensated molding die is used for molding tests to obtain the test surface shape error and test optical error of the glass optical element after the test; the device further includes: The determining unit is adapted to determine the test surface shape error and test optical error of the glass optical element obtained by molding test using the compensated molding die; The judgment unit is adapted to determine whether the test surface shape error and the test optical error are less than the surface shape error threshold and the optical error threshold, respectively: If the test surface shape error is not less than the surface shape error threshold or the test optical error is not less than the optical error threshold, the correction unit is adapted to correct the simulation prediction model based on the test surface shape error and test optical error of the glass optical element after the test, so as to obtain the corrected simulation prediction model. The simulation prediction unit is also adapted to: using the modified simulation prediction model, based on the initial molding die parameters, the glass preform simulation model and the high-temperature viscoelastic parameters of the glass, to simulate the molding process to obtain a simulated glass optical element, and to predict the surface shape error and optical error of the simulated glass optical element, thereby obtaining the corresponding predicted surface shape error and predicted optical error; The compensation unit is also adapted to: compensate the initial molding die parameters based on the predicted surface error and the predicted optical error to obtain the compensated molding die parameters, so as to manufacture the compensated molding die based on the compensated molding die parameters, until the test surface error and test optical error of the glass optical element after the test are less than the surface error threshold and the optical error threshold, respectively, and then use the current corrected simulation prediction model as the final simulation prediction model.

12. A computing device, comprising: At least one processor; and A memory storing program instructions, wherein the program instructions are configured to be processed by the at least one processor, the program instructions including instructions for processing the method as described in any one of claims 1-9.

13. A computer program product comprising a computer program / instructions, wherein, When the computer program / instructions are executed by the processor, they implement the method as described in any one of claims 1-9.

14. A readable storage medium storing program instructions that, when read and processed by a computing device, cause the computing device to perform the method as described in any one of claims 1-9.

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