A combination system and method of correction of a prescription lens with a focus adjustable module
By combining static prescription lenses with a dynamic focusing module in an optical superposition design, the problems of high power consumption, large thickness, and insufficient flexibility of traditional static lenses in fully dynamic focusing lenses are solved. This achieves a lens design with low power consumption, thinness, and high optical performance, providing stability and comfort in visual quality throughout the entire process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 南通诺瞳奕目医疗科技有限公司
- Filing Date
- 2026-04-22
- Publication Date
- 2026-06-09
AI Technical Summary
In existing technologies, fully dynamic focusing lenses have high power consumption and large thickness, while traditional static lenses lack flexibility and cannot meet the requirements of simultaneously achieving ultra-thin appearance, low power consumption, and high optical performance.
It adopts an optical superposition design of static prescription lens and dynamic adjustable focus module, and ensures that the two are precisely aligned through the alignment structure. The calibration controller generates a drive signal to adjust the focus and compensate for aberrations caused by assembly deviation.
It achieves a lens design with low power consumption, thinness and high optical performance, providing stable and comfortable visual quality throughout the entire process, and reducing mass production costs.
Smart Images
Figure CN122172465A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of lens correction technology, and in particular to a combined correction system and method of prescription lenses and adjustable focus modules. Background Technology
[0002] For users who simultaneously have basic refractive errors such as myopia, hyperopia, or astigmatism, as well as presbyopia (additional focal length) needs, the ideal correction solution needs to simultaneously meet the basic refractive error correction of the entire aperture and the dynamic focal length adjustment capability that changes with the usage scenario (such as looking at distant or near objects).
[0003] Currently, one approach is to use fully dynamic adjustable lenses to simultaneously cover the base prescription and the add adjustment. However, to cover the entire prescription (including spherical, cylindrical, and axial) and the add adjustment range, this approach typically requires a larger effective optical aperture and higher driving voltage, leading to increased overall lens thickness, higher power consumption, and challenges in mass production costs and consistency. Another approach is to use traditional static prescription lenses (such as single-vision, bifocal, or progressive lenses), which, while providing stable base correction, cannot dynamically adjust the add adjustment according to changes in the user's viewing distance, resulting in insufficient flexibility.
[0004] Therefore, a technical solution is needed that can balance ultra-thin appearance, low power consumption, high optical performance, and good mass production feasibility. Summary of the Invention
[0005] The core of this invention lies in solving the problems of high power consumption, large thickness, and insufficient flexibility of traditional static lenses in the prior art by using an optical superposition design of static prescription lenses and dynamic adjustable focus modules.
[0006] To solve the above problems, the present invention adopts the following technical solution.
[0007] A combined corrective system of prescription lenses and an adjustable focus module includes: Static prescription lenses are used to provide users with basic refractive power correction in terms of spherical, cylindrical, and axial aspects; A dynamic focus-adjustable module, optically superimposed on a static prescription lens, is used to provide focus adjustment within a preset range; The alignment structure is used to establish and maintain the relative positional relationship between the static prescription lens and the dynamic focusing module during the assembly process. The relative positional relationship includes at least one of optical center alignment and pupil reference alignment. The calibration controller is communicatively connected to the dynamic focusing module and is used to generate drive signals to control the focal length adjustment (Add) of the dynamic focusing module based on the user's prescription parameters, wearing parameters, and the assembly state determined by the alignment structure, and to compensate for additional optical aberrations caused by assembly misalignment or tilt.
[0008] A method for combined correction of static prescription lenses and dynamic adjustable focus modules includes the following steps: S1: Obtain the user's prescription parameters and wearing parameters; the prescription parameters should include at least spherical power, cylindrical power, axis, and adjustment power requirements; the wearing parameters should include at least pupillary distance, vertex distance, tilt angle, and wrap angle. S2: Based on prescription parameters, the total optical correction requirement is broken down into static basic correction items and dynamic focal length adjustment items. The breakdown is performed through optimization to minimize the focal length adjustment range required by the dynamic adjustable focus module, while meeting the user's total refractive correction requirements. S3: Based on the dynamic focus adjustment item and wearing parameters, determine the selection parameters of the dynamic adjustable focus module, and assemble the selected dynamic adjustable focus module with the corresponding static prescription lens through a preset alignment structure. S4: Perform optical measurements on the assembled system to obtain synthetic wavefront data, and estimate the assembly eccentricity error based on the synthetic wavefront data; S5: Calculate and update the driving parameters of the dynamic focus module based on the dynamic focus Add adjustment term and the estimated assembly decentering error, so as to compensate for the prism effect and aberration increment caused by assembly decentering while providing the target Add. S6: Generate and output a traceability data packet corresponding to the combined system. The traceability data packet shall include at least the static prescription lens identifier, the dynamic adjustable focus module identifier, the assembly calibration parameters, and the drive compensation parameters.
[0009] Compared with the prior art, the advantages of this invention are: (1) Since the basic diopter is borne by the static lens, the dynamic adjustable focus module only needs to provide a small range of diopter adjustment. Therefore, a smaller effective optical aperture and a lower driving voltage can be used, which significantly reduces power consumption, thickness and cost. (2) Static prescription lenses provide a clear, distortion-free field of vision across the entire aperture; the dynamic module mainly functions to fine-tune the focus in the pupil area. The two work together to ensure visual quality from far to near. (3) By accurately measuring and compensating for assembly centering error, the prism effect and additional aberration caused by assembly deviation can be effectively reduced or eliminated, thus improving wearing comfort and visual consistency. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the overall structure of the combined correction system of the present invention; Figure 2 This is a schematic diagram of the wavefront composition and additional error terms of the present invention; Figure 3This is a schematic diagram of the correction method of the present invention; Figure 4 This is a schematic diagram illustrating the assembly coordinates, centering / tilting error estimation, and compensation calculation of the present invention. Figure 5 This is a schematic diagram comparing the residual wavefront RMS under different modes of the present invention; Figure 6 This is a schematic diagram of the gradual waveform and temperature compensation for the far-to-near mode switching of the present invention. Figure 7 This is a schematic diagram of the structure of the data packet traceability in the combined correction system of the present invention. Detailed Implementation
[0011] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.
[0012] First implementation method: Please see Figures 1-7 A combined correction system of prescription lens and adjustable focus module, comprising a static prescription lens, a dynamic adjustable focus module, an alignment structure and a calibration controller; Static prescription lenses can be planar diffraction prescription lenses or ultra-thin freeform refractive lenses. Their optical surfaces are precisely machined according to the user's spherical, cylindrical, and axial prescriptions, and are responsible for providing full-aperture basic refractive power correction. The effective optical aperture of the dynamic focus module is smaller than that of the static prescription lens, and its installation position is configured to correspond to the pupil area when the user wears it, for example, about 20mm, and is designed to be located near the main pupil activity area when the user wears it after assembly. This module alters its optical phase by applying a voltage signal from a calibration controller, thereby providing focal length adjustment (Add) from 0 to a preset maximum value (e.g., +2.50D).
[0013] The alignment structure includes mechanical positioning references and optical alignment marks to align the optical center of the dynamic focusing module with the optical center of the static prescription lens. During assembly, these references are used to ensure that the optical center of the dynamic focusing module is precisely aligned with the optical center of the static prescription lens and the theoretical pupil center position. After assembly, the alignment structure also fixes the relative positions of the two.
[0014] The calibration controller has a built-in memory and processor. During the system calibration phase, it controls optical measurement equipment (such as wavefront sensors) to measure the assembled system and obtain the actual synthetic wavefront. The calibration controller receives user prescription parameters and wearing parameters, and performs prescription splitting, module selection, assembly error estimation, and drive compensation based on these parameters. Preferably, the static lens provides the base correction wavefront Φ_base, which consists of the spherical lens, cylindrical lens, and axis, while the dynamic module provides the add wavefront Φ_add and the compensation amount calculated from the assembly error. The calibration controller is configured to: store compensation parameters for wavefront error terms caused by assembly errors; and, when driving the dynamically adjustable focus module, generate the final drive signal based on the base drive parameters and compensation parameters corresponding to the target Add value, ensuring that the synthesized wavefront of the combined system under ideal design conditions satisfies Φ_total = Φ_base + Φ_add; a decentering / tilting error term Φ_dec is introduced into the control, such as... Figure 3 As shown.
[0015] Where Φ_base is the wavefront quantity used to construct the ideal design state; Φ_add is the wavefront quantity used to construct the ideal design state; and Φ_dec is the wavefront quantity obtained from assembly deviation estimation.
[0016] The compensation parameter is based on the estimation of the assembly core removal amount. The assembly core removal amount and the resulting prism effect increment P satisfy the approximate relationship P≈F_eq·Δ, where P is the prism power, F_eq is the equivalent focal power in the target Add state, and the eccentricity Δ is in cm. By reducing |P| through drive compensation or assembly adjustment, the prism effect increment caused by core removal is calculated according to the approximate Prentice relation.
[0017] The system supports switching between far / medium / near modes and uses a gradual waveform or blink window to reduce perceptible artifacts during switching. During user use, when the user switches visual modes (e.g., from "far" mode to "near" mode), the system satisfies |dV / dt|<τ_slew during mode switching or performs switching in the blink / scan window to reduce flicker. At a reference temperature T0=25°C, the calibration results of the three modes in this embodiment are shown in Table 1.
[0018] Table 1. Calibration results for far, medium, and near modes.
[0019] See Figure 5 In this embodiment, the residual wavefront RMS result was obtained by averaging the measurements performed three times for each of the farsighted mode (Add=0D), intermediate mode (Add=+0.75D), and myopic mode (Add=+1.50D) under the conditions of a 4mm pupil and a 550nm measurement wavelength. Figure 5 As can be seen, after assembly error compensation, the residual wavefront RMS in all three modes decreased significantly, indicating that eccentricity compensation and drive update can effectively improve the optical performance of the combined system.
[0020] See Figure 6 The diagram illustrates the gradual waveform during the switch from farsightedness mode to nearsightedness mode, as well as the driving voltage curves generated at 25°C and 35°C based on V_cmd(T)=V0(Add)+α(Add)·(T-T0)+ΔV_comp. In this embodiment, the target driving voltage for nearsightedness mode is 5.80V at 25°C. When the temperature rises to 35°C, the target driving voltage is updated to 5.92V after temperature compensation, using a compensation coefficient of α(Add)=0.012V / °C. The controller schedules the main switching process within a blink / saccade window of approximately 210ms to 340ms and limits the switching slope to reduce flicker perceived by the user.
[0021] Second implementation method: See Figures 2-7 A correction method applied to the combined correction system of the first embodiment specifically includes the following steps: S1: Obtain the user's prescription parameters and wearing parameters; the prescription parameters include at least spherical power, cylindrical power, axis, and adjustment power (Add) requirements; the wearing parameters include at least pupillary distance, vertex distance, tilt angle, and wrap angle; this step outputs the target dataset for static lens design and dynamic module selection; The prescription parameters used in this embodiment are as follows: spherical lens S = -2.00D, cylindrical lens C = -1.00D, axis Axis = 180°, target Add = +1.50D; the wearing parameters are: interpupillary distance PD = 62mm, vertex distance 12mm, tilt angle 8°, wrap angle 5°; the static prescription lens is a prescription lens that can provide full-aperture basic correction, with an optical diameter of 52mm; the dynamic adjustable focus module is an adjustable focus module with an effective optical diameter of 20mm and a focal power Add adjustment range of 0~+1.75D. S2: Based on prescription parameters, the prescription is split into static base correction items and dynamic add items; the prescription splitting optimizes the allocation of base and add items to minimize the range required by the dynamic module and meet user needs; The prescription is broken down as follows: the basic spherical, cylindrical, and axis lenses are handled by the static prescription lenses; the dynamic module mainly handles the focal length adjustment in the +0.00D, +0.75D, and +1.50D modes, with a small amount of compensation freedom reserved. Prescription splitting optimization is performed so that the static lens undertakes the basic correction of the entire aperture, while the dynamic module mainly undertakes the focal power adjustment and minor compensation within the pupil area. Prescription splitting can be achieved by minimizing the effective aperture, maximum driving voltage, and compensation amount required by the dynamic module while ensuring that the residual wavefront RMS of the combined system is less than a preset threshold. The engineering significance of this S2 step is to reduce the optical aperture and driving range of the dynamic module, thereby reducing system power consumption and thickness.
[0022] S3: Based on the dynamic focus adjustment item and wearing parameters, determine the selection parameters of the dynamic adjustable focus module, and assemble the selected dynamic adjustable focus module with the corresponding static prescription lens through a preset alignment structure; In this embodiment, a 20mm diameter dynamic module is selected based on the pupil activity area and assembly margin, and the assembly is completed using mechanical reference and optical alignment marks. S4: Perform optical measurements on the assembled system (assembled using the alignment structure in the first embodiment), obtain synthetic wavefront data, and estimate the assembly eccentricity error based on the synthetic wavefront data; the synthetic wavefront is represented as Φ_total=Φ_base+Φ_add, and a eccentricity / tilt error term Φ_dec is introduced into the control. After assembly, Δx, Δy, and θ can be estimated based on the assembly coordinate system. When using wavefront measurement to estimate the eccentricity error, the first-order prism / tilt term can be extracted from the synthetic wavefront, and then compared with the pre-calibrated sensitivity matrix to obtain the eccentricity in the x and y directions and the tilt angle. For the equivalent focal length F_eq of the target in the Add state, it can be determined through the calibration table or module design parameters, thus obtaining the approximate prism increment P≈F_eq·Δ. Wavefront measurements of the assembled system yielded Δx = 0.12 mm, Δy = -0.08 mm, and θ = 0.35°. S5: If the system is in normal working condition, then execute: Calculate and update the driving parameters of the dynamic adjustable focus module based on the dynamic focus adjustment term and the estimated assembly centering error, so as to compensate for the prism effect and aberration increment caused by assembly centering while providing the target adjustment focal length. The driving parameters can be generated according to V_cmd(T)=V0(Add)+α(Add)·(T-T0)+ΔV_comp, where V0(Add) is the basic driving voltage required to reach the target Add at the reference temperature T0, α(Add) is the temperature drift compensation coefficient corresponding to the target Add, ΔV_comp is the assembly error compensation amount, and T0 is the preset reference temperature. During mode switching, a piecewise linear or S-shaped gradual waveform can be used, with a constraint |dV / dt|≤τ_slew. If the system detects blinking or a scanning window, the switching can also be mainly scheduled within that window to reduce visually perceptible artifacts.
[0023] When the system malfunctions or the dynamic module fails, it can enter the static prescription lens mode. In this mode, the dynamic module is placed in a zero-drive, transparent, or preset safe state, and the static prescription lens alone undertakes basic refractive correction, thereby ensuring the most basic distance vision function. When the dynamic module aperture position deviation is detected to exceed the preset threshold (|Δ|>Δ_th) or the rotation angle is greater than the set angle (|θ|>θ_th), an alarm or reassembly process is triggered, and a cause code corresponding to the cause of the deviation is generated. S6: Encapsulate the lens ID, module ID, assembly error, drive compensation parameters, and QC results into a traceability data packet, generate and output the traceability data packet corresponding to the assembly system; see [link / reference]. Figure 7 The traceability data package preferably consists of static lens ID, dynamic module ID, anonymized prescription field, wearing parameter field, assembly error estimate, drive compensation parameter, QC indicator, and cause code; it may also include timestamp, version number, hash signature, and calibration station number. This structure allows the design, assembly, measurement, compensation, and quality control results of a single product to be uniformly bound to a single integrated system identifier.
[0024] Optionally, user prescription parameters and wearing parameters can be recorded as anonymized fields and used for population statistics and design feedback, wherein the anonymization process removes at least information that can directly identify the user.
[0025] Compared with existing technologies, this invention has the following advantages: First, the static lens undertakes basic corrections such as spherical / cylindrical / axial alignment, so that the dynamic module does not need to cover the full aperture prescription, but only needs to cover the focal length adjustment and compensation within the pupillary activity area, which can reduce the aperture, driving voltage and power consumption of the dynamic module; Second, by measuring and compensating for decentricity and tilt errors, the prism effect and additional aberrations caused by assembly can be significantly reduced; Third, through mode switching strategy, temperature compensation strategy and traceable data packet output, the closed-loop capability required for engineering mass production and after-sales maintenance is achieved.
[0026] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.
Claims
1. A combined correction system of prescription lenses and an adjustable focus module, characterized in that, include: Static prescription lenses are used to provide users with basic refractive correction. Dynamically adjustable focus module, static prescription lens optical superposition assembly, used to provide adjustable focus within a preset range; The alignment structure is used to establish and maintain a preset relative positional relationship between the static prescription lens and the dynamic adjustable focus module during the assembly process; The calibration controller is communicatively connected to the dynamic adjustable focus module. It generates drive signals to control the focal length adjustment (Add) of the dynamic adjustable focus module based on the user's prescription parameters, wearing parameters, and the assembly state determined by the alignment structure. It also compensates for additional optical aberrations caused by assembly misalignment or tilt.
2. The system according to claim 1, characterized in that, The static prescription lens is either a planar diffraction prescription lens or a thin freeform refractive lens.
3. The system according to claim 1, characterized in that, The effective optical aperture of the dynamically adjustable focus module is smaller than that of the static prescription lens, and its installation position is configured to correspond to the pupil area when the user wears it.
4. The system according to claim 1, characterized in that, The alignment structure includes a mechanical positioning reference and optical alignment marks, used to align the optical center of the dynamically adjustable focus module with the optical center of the static prescription lens.
5. The system according to claim 1, characterized in that, The calibration controller is configured to: store compensation parameters for wavefront error terms caused by assembly errors; and generate the final drive signal based on the base drive parameters and compensation parameters corresponding to the target Add value when driving the dynamic adjustable focus module, so that the synthesized wavefront of the combined correction system under ideal design conditions satisfies Φ_total=Φ_base+Φ_add. Where Φ_base is the wavefront quantity used to construct the ideal design state; Φ_add is the wavefront quantity.
6. The system according to claim 5, characterized in that, The compensation parameter is based on the estimation of the assembly core removal amount, which satisfies the approximate relationship P≈F_eq·Δ with the resulting prism effect increment P, and is reduced by driving compensation or assembly adjustment, where F_eq is the equivalent focal length in the target Add state.
7. The system according to claim 1, characterized in that, The system supports switching between far, medium, and near modes, and uses a gradual waveform or blink window to reduce perceptible artifacts during switching.
8. The system according to claim 7, characterized in that, The system supports fault degradation to static prescription lens mode.
9. The system according to claim 1, characterized in that, The system outputs a synthetic wavefront evaluation index and associates it with the QA reason code to form a traceability.
10. A correction method applied to the system according to any one of claims 1-9, characterized in that, Specifically, the following steps are included: S1: Obtain the user's prescription parameters and wearing parameters; the prescription parameters should include at least spherical power, cylindrical power, axis, and adjustment power requirements; the wearing parameters should include at least pupillary distance, vertex distance, tilt angle, and wrap angle. S2: Based on the prescription parameters, the prescription is divided into static basic correction items and dynamic Add items; the division is carried out through optimization to minimize the focal adjustment range required by the dynamic adjustable focus module, while meeting the user's total refractive correction needs; S3: Based on the dynamic focus adjustment item and wearing parameters, determine the selection parameters of the dynamic adjustable focus module, and assemble the selected dynamic adjustable focus module with the corresponding static prescription lens through a preset alignment structure. S4: Perform optical measurements on the assembled system to obtain synthetic wavefront data, and estimate the assembly eccentricity error based on the synthetic wavefront data; S5: Calculate and update the driving parameters of the dynamic focus module based on the dynamic focus Add adjustment term and the estimated assembly decentering error, so as to compensate for the prism effect and aberration increment caused by assembly decentering while providing the target focus adjustment. S6: Generate and output the traceability data packet corresponding to the combined system.
11. The method according to claim 10, characterized in that, The traceability data package includes at least the static prescription lens identifier, the dynamic adjustable focus module identifier, assembly calibration parameters, and drive compensation parameters.
12. The method according to claim 10, characterized in that, The generation of the traceability data packet includes: binding the unique identifier of the static prescription lens with the unique identifier of the dynamic adjustable focus module to generate a combined system identifier, and encapsulating the combined system identifier, the estimated value of the assembly core-deposition error, the drive compensation parameters, and the digital signature or hash value generated based on the above information into the data packet.
13. The method according to claim 10, characterized in that, The driving parameters in S5 are generated according to V_cmd(T)=V0(Add)+α(Add)·(T-T0)+ΔV_comp, where V_cmd(T) represents the target driving voltage at temperature T, V0(Add) represents the basic driving voltage required to reach the target Add at the reference temperature T0, α(Add) represents the temperature drift compensation coefficient related to the target Add, ΔV_comp represents the driving compensation amount introduced by assembly core removal and / or tilting error, and T0 is the preset reference temperature.
14. The method according to claim 10, characterized in that, When the aperture position of the dynamic module is detected to be offset by more than a preset threshold or the rotation angle is greater than a set angle, an alarm or reassembly process is triggered, and a cause code corresponding to the cause of the offset is generated.