Solid-liquid composite lens and design method thereof

Abstract

The invention discloses a solid-liquid composite lens and a design method thereof. The design method comprises the following steps: determining a reference degree and an adjustment range of the solid-liquid composite lens; in a simulation environment, establishing a human eye model according to the determined reference degree; mechanical and optical joint simulation is established, and a mechanical simulation result is imported into optical simulation, so that an elastic film is established in front of the human eye model; an initial solid lens is established in front of the human eye model, and a medium between the initial solid lens and the elastic film is set as liquid; setting a plurality of groups of working conditions, respectively setting a plurality of light sources at different positions in a visual range, and setting the pressure intensity of a lens system as an independent variable; all other variables are kept unified among different groups; and according to human eye imaging requirements, setting operands as evaluation standards, performing optimization, and determining final solid-liquid composite lens parameters. The solid-liquid composite glasses prepared by the invention can reduce aberration, improve the imaging definition and enhance the stability of the whole optical system.

Description

Technical Field

[0001] The invention relates to a solid-liquid composite glasses design method, in particular to a solid-liquid composite lens and a design method thereof. Background Art

[0002] The design of traditional glasses is based on the principle of fixed diopter, and its various optical parameters remain unchanged after production. Studies have shown that using low-degree glasses when looking at close objects can help slow the progression of myopia, and many young and middle-aged people will choose to wear low-degree glasses to relieve eye fatigue when looking at close objects. However, traditional glasses cannot be adjusted in real time according to the user's visual needs.

[0003] Existing liquid lens technology has made significant progress in the field of optics, especially in optical systems such as microscopes and cameras, where liquid lenses have shown excellent focusing capabilities and can be used to solve the above problems. However, the effects of existing products are often unsatisfactory. For example, although Hoya Optics' ViXion01 liquid lens glasses have electrowetting technology, which can change the curvature of the lens by adjusting the pressure to adjust the focal length, the lens aperture is too small, resulting in low brightness, narrow field of view, and poor user experience. Therefore, most of the normal-sized liquid lenses on the market currently use a liquid filling solution, which is to fill the liquid into a circular liquid capsule encapsulated by a flexible membrane, and then increase or decrease the pressure to make the surface convex or concave to achieve the focusing function. However, its imaging effect is still far behind that of traditional glasses.

[0004] Looking at the development history of glasses, we can see that they have developed from the initial ordinary symmetrical lenses to the concave and convex configuration, to the aspheric optimization, and finally to the scientific curvature design, and have been optimized for the human eye. As a complex optical system, the eye is significantly different from other optical systems. Simply applying traditional liquid lens technology to glasses can meet some basic needs, but it is still difficult to achieve a high-quality visual experience in use. Therefore, it is necessary to develop a zoom glasses specifically for eye scenes. Summary of the invention

[0005] The first purpose of the present invention is to overcome the deficiencies of the above prior art and provide a method for designing solid-liquid composite glasses.

[0006] The second object of the present invention is to provide a solid-liquid composite spectacles.

[0007] The first object of the present invention is achieved by the following technical solution: The solid-liquid composite lens design method comprises the following steps:

[0008] S1. Determine the reference degree and adjustment range of the solid-liquid composite lens;

[0009] S2. In a simulation environment, establishing a human eye model according to the determined reference degree;

[0010] S3, establishing a joint simulation of mechanics and optics, and importing the results of the mechanical simulation into the optical simulation to establish an elastic membrane in front of the human eye model;

[0011] S4, establishing an initial solid lens in front of the human eye model, and setting the medium between the initial solid lens and the elastic film to be liquid;

[0012] S5, setting several groups of working conditions, setting several light sources at different positions in the visual range, and setting the pressure of the lens system as an independent variable; all other variables are kept uniform among different groups;

[0013] S6. According to the imaging requirements of the human eye, set the operation number as the evaluation criterion, and perform optimization to determine the final solid-liquid composite lens parameters.

[0014] Step S3 includes the following steps:

[0015] S31. In mechanical simulation, an initial geometric model of the elastic module is established, a mesh is divided, and material parameters and boundary conditions of the elastic module are set;

[0016] S32. According to the initial pressure P0 transmitted by the main program, the relative pressure on both sides of the spring membrane is set to P:

[0017] P=P0+ρgy

[0018] Among them, ρ is the liquid density, g is the gravitational acceleration, and y is the vertical coordinate relative to the reference plane;

[0019] S33, performing mechanical simulation to simulate the deformation of the elastic membrane;

[0020] S34, returning the result to the optical simulation as the surface shape of the elastic module in the optical simulation.

[0021] Step S5 includes the following steps:

[0022] S51, setting several groups of working conditions, and keeping the models and settings in all groups of working conditions consistent;

[0023] S52, for each group of working conditions, respectively set the light sources so that the light sources in each group are distributed at different distances from the human eye model, and keep other parameters and settings consistent;

[0024] S53. Set the initial pressure as the independent variable, and keep all other variables the same across different groups.

[0025] The initial pressure P is determined by the following steps:

[0026] S321, determining the corresponding additional diopter D=1 / L according to different light source distances L;

[0027] S322, calculating the curvature radius of the corresponding elastic module according to the diopter formula of the solid-liquid composite lens;

[0028] S323. Determine the pressure corresponding to the corresponding radius of curvature according to the mechanical simulation law.

[0029] The evaluation criteria in step S6 are:

[0030] F M (p1,p2,p3…,a1,a3,a3…)=∑w i F i (p i ,a1,a3,a3…)

[0031] Where i is a natural number, indicating the order of each group of light sources; p i is the pressure in each set of working conditions, a1, a2, a3… are other optimization variables; F i is the evaluation function of imaging quality, w i is the weight parameter of each group of working conditions.

[0032] Step S6 includes the following steps:

[0033] S61, determining optimized variables, including different pressures of each group and unified optimized variables among different groups;

[0034] S62, for each group of working conditions, perform simulation calculations and weight the results together;

[0035] S63. Taking the evaluation criteria as the target, continuously change the variable numbers and optimize iteratively until the set goals are met.

[0036] When the residual error obtained by iteration is less than 0.001 compared with the result of the evaluation standard, the iteration is stopped.

[0037] When the residual error obtained by iteration is less than 0.001 compared with the result of the evaluation standard, the iteration is stopped.

[0038] A solid-liquid composite lens comprises a lens frame, a fixed lens made of a hard material and an elastic membrane made of a transparent elastic material. The fixed lens and the spring membrane are arranged relative to each other and are fixed to the lens frame to form a liquid injection cavity. When no liquid is injected into the liquid injection cavity, the curved surface of the elastic membrane is in close contact with that of the fixed lens. When liquid is injected into the liquid injection cavity, a focus-adjustable liquid lens is formed.

[0039] The shape and curvature of the first curved surface of the liquid lens are the same as those of the second curved surface of the fixed lens, and the shape and curvature of the second curved surface of the liquid lens are the same as those of the first curved surface of the elastic membrane.

[0040] The base degree of the liquid lens is:

[0041]

[0042] The adjustment range is:

[0043]

[0044] Among them, R1, R2, R3, and R4 are the curvature radii of the first curved surface of the solid lens, the first curved surface of the liquid lens, i.e. the second curved surface of the solid lens, the second curved surface of the liquid lens, i.e. the first curved surface of the elastic film, and the second curved surface of the elastic film, respectively; n0 is the refractive index of air, n1 is the refractive index of the hard material of the solid lens, n2 is the refractive index of the transparent liquid of the liquid lens, and n3 is the refractive index of the elastic film used to make the liquid lens.

[0045] The present invention has the following advantages over the prior art:

[0046] The present invention establishes a feedback correction mechanism between the liquid lens and the solid-state lens, and fully considers the influence of the interaction between the two lenses on the imaging during the design process. That is, when the light sources are set at different positions in the visual range, the elastic film is deformed and the curvature is changed under mechanical constraints by adjusting the pressure, thereby changing the refractive power of the solid-liquid composite lens so that the image falls just on the retina. At the same time, in order to solve the aberration and other problems caused by the shape of the deformed liquid lens, the surface parameters of the solid lens are changed for optimization to achieve the best imaging effect. The solid-liquid composite glasses prepared according to the method of the present invention can reduce aberrations, improve imaging clarity, and enhance the stability of the entire optical system. Moreover, the present invention can take into account the stability and consistency of image quality at the same time when zooming, avoiding the problem of image quality degradation that may occur in traditional designs, and effectively meeting diverse application needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of a solid-liquid composite lens in a first state according to an embodiment of the present invention. In this state, no liquid is injected into the liquid injection cavity, and the solid-liquid composite lens is a double-cemented lens.

[0048] Figure 2 This is a schematic diagram of the second state of the solid-liquid composite lens according to an embodiment of the present invention. In this state, half of the liquid is injected into the liquid injection cavity.

[0049] Figure 3 1 is a schematic diagram of a third state of a solid-liquid composite lens according to an embodiment of the present invention. In this state, the liquid filling cavity is filled with liquid, that is, the diopter of the solid-liquid composite lens at this time is the maximum value of ΔF.

[0050] Figure 4It is a schematic structural diagram of a solid-liquid composite lens when installing temples according to an embodiment of the present invention.

[0051] Among them, 1 is a frame, 2 is a fixed lens, 3 is an elastic membrane, 4 is a liquid injection cavity, 5 is liquid, and 6 is a temple. DETAILED DESCRIPTION

[0052] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0053] like Figures 1 to 3 As shown, the solid-liquid composite lens includes a frame, a fixed lens made of a hard material, and an elastic membrane made of a transparent elastic material. The fixed lens and the spring membrane are arranged relatively to each other and are fixed to the frame to form a liquid injection cavity. When no liquid is injected into the liquid injection cavity, the curved surface of the elastic membrane is in close contact with that of the fixed lens. When liquid is injected into the liquid injection cavity, a focus-adjustable liquid lens is formed. The shape and curvature of the first curved surface of the liquid lens are the same as the second curved surface of the fixed lens, and the shape and curvature of the second curved surface of the liquid lens are the same as the first curved surface of the elastic membrane. Specifically, there are two fixed lenses and two elastic membranes, and each fixed lens and elastic membrane is fixed in a corresponding frame as a group to form two liquid injection cavities. The amount of liquid injected into the two liquid injection cavities can be controlled separately to meet the individual needs of the user. The shape of the liquid injection cavity changes slowly with the amount of liquid injected, such as Figures 1 to 3 As shown. Figure 1 As shown, when no liquid is injected into the injection cavity, that is, when the pressure in the injection cavity is the smallest, the curved surface of the elastic membrane is in close contact with the fixed lens; Figure 3 As shown, after the liquid is injected into the injection chamber, when the injection amount of the liquid is at the maximum value, that is, when the pressure of the injection chamber is at the maximum value, the change in the diopter of the formed liquid lens is the largest. At this time, the change in diopter ΔF is:

[0054]

[0055] Among them, R1, R2, R3, and R4 are the curvature radii of the first curved surface of the solid lens, the first curved surface of the liquid lens, i.e. the second curved surface of the solid lens, the second curved surface of the liquid lens, i.e. the first curved surface of the elastic film, and the second curved surface of the elastic film, respectively; n0 is the refractive index of air, n1 is the refractive index of the hard material of the solid lens, n2 is the refractive index of the transparent liquid of the liquid lens, and n3 is the refractive index of the elastic film used to make the liquid lens.

[0056] The base degree of the liquid lens is:

[0057]

[0058] The adjustment range is:

[0059]

[0060] Among them, R1, R2, R3, and R4 are the curvature radii of the first curved surface of the solid lens, the first curved surface of the liquid lens, i.e. the second curved surface of the solid lens, the second curved surface of the liquid lens, i.e. the first curved surface of the elastic film, and the second curved surface of the elastic film, respectively; n0 is the refractive index of air, n1 is the refractive index of the hard material of the solid lens, n2 is the refractive index of the transparent liquid of the liquid lens, and n3 is the refractive index of the elastic film used to make the liquid lens.

[0061] like Figure 4 As shown, by installing temples at both ends of the frame, the glasses can meet the individual needs of the user.

[0062] The solid-liquid composite lens design method comprises the following steps:

[0063] S1. Determine the reference degree and adjustment range of the solid-liquid composite lens; specifically, take a liquid lens formed by one of the liquid injection chambers as an example for explanation. The refractive power of this liquid lens is:

[0064]

[0065] R1, R2, R3, and R4 are the curvature radii of the first curved surface of the solid lens, the first curved surface of the liquid lens, i.e., the second curved surface of the solid lens, the second curved surface of the liquid lens, i.e., the first curved surface of the elastic membrane, and the second curved surface of the elastic membrane, respectively, and n0 is the refractive index of air.

[0066] When there is no liquid in the injection cavity, the fixed lens and the elastic membrane form a double-cemented eyeglass. At this time, the solid-liquid composite eyeglass is in the minimum diopter state, and the corresponding degree is positioned as the reference degree of the composite lens, recorded as F0. The reference degree is F0:

[0067]

[0068] When liquid is injected into the injection cavity to form a liquid lens, the diopter of the solid-liquid composite glasses gradually increases, and the adjustment range is the diopter change ΔF:

[0069]

[0070] Among them, R1, R2, R3, and R4 are the curvature radii of the first curved surface of the solid lens, the first curved surface of the liquid lens, i.e. the second curved surface of the solid lens, the second curved surface of the liquid lens, i.e. the first curved surface of the elastic film, and the second curved surface of the elastic film, respectively; n0 is the refractive index of air, n1 is the refractive index of the hard material of the solid lens, n2 is the refractive index of the transparent liquid of the liquid lens, and n3 is the refractive index of the elastic film used to make the liquid lens.

[0071] In this way, the initial refractive power is obtained through the solid lens, which reduces the range required for zooming, thereby reducing the deformation of the elastic module to a smaller range, making the rules more consistent and the imaging effect better.

[0072] S2. In a simulation environment, a human eye model is established according to the determined reference degree; specifically, the human eye model includes components such as cornea, anterior chamber (fluid), pupil, lens, vitreous body, retina, etc. Among them, the pupil is used as a stop and the retina is used as an imaging surface.

[0073] S3, establishing a joint simulation of mechanics and optics, and importing the results of the mechanical simulation into the optical simulation to establish an elastic membrane in front of the human eye model; step S3 includes the following steps:

[0074] S31. In mechanical simulation, an initial geometric model of the elastic module is established, a mesh is divided, and material parameters and boundary conditions of the elastic module are set;

[0075] S32. According to the initial pressure P0 transmitted by the main program, the relative pressure on both sides of the spring membrane is set to P:

[0076] P=P0+ρgy

[0077] Among them, ρ is the liquid density, g is the gravitational acceleration, and y is the vertical coordinate relative to the reference plane;

[0078] The initial pressure P is determined by the following steps:

[0079] S321, determining the corresponding additional diopter D=1 / L according to different light source distances L;

[0080] S322, calculating the curvature radius of the corresponding elastic module according to the diopter formula of the solid-liquid composite lens;

[0081] S323. Determine the pressure corresponding to the corresponding radius of curvature according to the mechanical simulation law.

[0082] S33, performing mechanical simulation to simulate the deformation of the elastic membrane;

[0083] S34, returning the result to the optical simulation as the surface shape of the elastic module in the optical simulation.

[0084] S4. An initial solid lens is established in front of the human eye model, and the medium between the initial solid lens and the elastic film is set to be liquid; specifically, in this liquid lens, the front-to-back relationship between the elastic film and the liquid can be arbitrary, and the front-to-back order can be determined according to the appearance style of the entire solid-liquid composite glasses and other requirements.

[0085] S5, setting several groups of working conditions, setting several light sources at different positions in the visual range, and setting the pressure of the lens system as an independent variable; all other variables are kept uniform between different groups; step S5 includes the following steps:

[0086] S51, setting several groups of working conditions, and keeping the models and settings in all groups of working conditions consistent;

[0087] S52, for each group of working conditions, respectively set the light sources so that the light sources in each group are distributed at different distances from the human eye model, and keep other parameters and settings consistent;

[0088] S53. Set the initial pressure as the independent variable, and keep all other variables the same across different groups.

[0089] S6. According to the imaging requirements of the human eye, set the operation number as the evaluation criterion, and perform optimization to determine the final solid-liquid composite lens parameters.

[0090] The evaluation criteria in step S6 are:

[0091] F M (p1,p2,p3…,a1,a2,a3…)=Σw i F i (p i ,a1,a2,a3…)

[0092] Where i is a natural number, indicating the order of each group of light sources; p i is the pressure in each set of working conditions, a1, a2, a3… are other optimization variables; F i is the evaluation function of imaging quality, w i is the weight parameter of each group of working conditions.

[0093] Step S6 includes the following steps:

[0094] S61, determining optimized variables, including different pressures of each group and unified optimized variables among different groups;

[0095] S62, for each group of working conditions, perform simulation calculations and weight the results together;

[0096] S63. Taking the evaluation criteria as the target, continuously change the variable numbers and optimize iteratively until the set goals are met.

[0097] Generally speaking, the criteria for stopping iteration include whether the evaluation function reaches a certain expected range, whether the number of iterations exceeds a certain value, whether the residual is less than a certain value, etc.

[0098] In one embodiment, the iteration is stopped when the residual difference between the two evaluation results is less than 0.001.

[0099] In one embodiment, when the number of pending iterations exceeds 1000, the iteration is stopped.

[0100] In this embodiment, when optimizing multiple groups of working conditions at the same time, in different groups, each variable remains consistent, while the pressure of different groups is different and is an independent variable, and each group uses different weight parameters for weighted optimization. It reflects the importance of the position. Specifically, it should be determined according to the eye needs of each person. If the main purpose of this pair of glasses is to see close up and far away, the weight coefficient for close up can be set larger, and the weight coefficient for far away can be set smaller. This will optimize different focal lengths together, and can take into account the imaging effects at different focal lengths, so that solid-liquid composite glasses with high imaging clarity and strong stability of the optical system can be made. At the same time, the present invention optimizes the three different media, solid lenses, elastic membranes and liquids, as a whole, thereby improving the optimization effect.

[0101] The above specific implementation modes are preferred embodiments of the present invention and cannot be used to limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A solid-liquid composite lens design method, characterized in that: The following steps are involved: S1. Determine the reference degree and adjustment range of the solid-liquid composite lens; S2. In a simulation environment, establishing a human eye model according to the determined reference degree; S3, establishing a joint simulation of mechanics and optics, and importing the results of the mechanical simulation into the optical simulation to establish an elastic membrane in front of the human eye model; S4, establishing an initial solid lens in front of the human eye model, and setting the medium between the initial solid lens and the elastic film to be liquid; S5, setting several groups of working conditions, setting several light sources at different positions in the visual range, and setting the pressure of the lens system as an independent variable; all other variables are kept uniform among different groups; S6. According to the imaging requirements of the human eye, set the operation number as the evaluation criterion, and perform optimization to determine the final solid-liquid composite lens parameters.

2. The solid-liquid composite lens design method according to claim 1, characterized in that: Step S3 includes the following steps: S31. In mechanical simulation, an initial geometric model of the elastic module is established, a mesh is divided, and material parameters and boundary conditions of the elastic module are set; S32. According to the initial pressure P0 transmitted by the main program, the relative pressure on both sides of the spring membrane is set to P: P=P0+ρgy Among them, ρ is the liquid density, g is the gravitational acceleration, and y is the vertical coordinate relative to the reference plane; S33, performing mechanical simulation to simulate the deformation of the elastic membrane; S34, returning the result to the optical simulation as the surface shape of the elastic module in the optical simulation.

3. The solid-liquid composite lens design method according to claim 2, characterized in that: Step S5 includes the following steps: S51, setting several groups of working conditions, and keeping the models and settings in all groups of working conditions consistent; S52, for each group of working conditions, respectively set the light sources so that the light sources in each group are distributed at different distances from the human eye model, and keep other parameters and settings consistent; S53. Set the initial pressure as the independent variable, and keep all other variables the same across different groups.

4. The solid-liquid composite lens design method according to claim 2, characterized in that: The initial pressure P is determined by the following steps: S321, determining the corresponding additional diopter D=1 / L according to different light source distances L; S322, calculating the curvature radius of the corresponding elastic module according to the diopter formula of the solid-liquid composite lens; S323. Determine the pressure corresponding to the corresponding radius of curvature according to the mechanical simulation law.

5. The solid-liquid composite lens design method according to claim 1, characterized in that: The evaluation criteria in step S6 are: <h2 style=";text-align:left;direction:ltr">F<h2 style=";text-align:left;direction:ltr"> M <h2 style=";text-align:left;direction:ltr"> (p1,p2,p3…,a1,a2,a3…)=∑w<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> F<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> (p<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> (a1,a2,a3…) Where i is a natural number, indicating the order of each group of light sources; p i is the pressure in each set of working conditions, a1, a2, a3… are other optimization variables; F i is the evaluation function of imaging quality, w i is the weight parameter of each group of working conditions.

6. The solid-liquid composite lens design method according to claim 1, characterized in that: Step S6 includes the following steps: S61, determining optimized variables, including different pressures of each group and unified optimized variables among different groups; S62, for each group of working conditions, perform simulation calculations and weight the results together; S63. Taking the evaluation criteria as the target, continuously change the variable numbers and optimize iteratively until the set goals are met.

7. A solid-liquid composite lens, characterized in that: It comprises a lens frame, a fixed lens made of a hard material and an elastic membrane made of a transparent elastic material, wherein the fixed lens and the spring membrane are arranged opposite to each other and are both fixed to the lens frame to form a liquid injection cavity; When no liquid is injected into the liquid injection cavity, the curved surface of the elastic membrane is in close contact with the fixed lens; when liquid is injected into the liquid injection cavity, a focus-adjustable liquid lens is formed.

8. The solid-liquid composite lens according to claim 7, characterized in that: The shape and curvature of the first curved surface of the liquid lens are the same as those of the second curved surface of the fixed lens, and the shape and curvature of the second curved surface of the liquid lens are the same as those of the first curved surface of the elastic membrane.

9. The solid-liquid composite lens according to claim 7, characterized in that: The base degree of the liquid lens is: The adjustment range is: Among them, R1, R2, R3, and R4 are the curvature radii of the first curved surface of the solid lens, the first curved surface of the liquid lens, i.e. the second curved surface of the solid lens, the second curved surface of the liquid lens, i.e. the first curved surface of the elastic film, and the second curved surface of the elastic film, respectively; n0 is the refractive index of air, n1 is the refractive index of the hard material of the solid lens, n2 is the refractive index of the transparent liquid of the liquid lens, and n3 is the refractive index of the elastic film used to make the liquid lens.

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