Bionic eyeball optical module, camera for simulating human eye, and test apparatus

Abstract

A bionic eyeball optical module, a camera for simulating a human eye, and a test apparatus. The bionic eyeball optical module comprises: a corneal lens (1), a dimming film (2) and an imaging lens group (4), which are arranged in sequence along an incident optical axis, wherein the distance between the dimming film (2) and a front surface of the corneal lens (1) ranges from 3 mm to 5 mm, and a light-transmitting area of the dimming film (2) can be adjusted; and the focal power of the corneal lens (1) is negative, and the overall focal power of the imaging lens group (4) is positive. By means of the combination of the corneal lens (1), the dimming film (2) and the imaging lens group (4), the optical module can simulate the imaging process of a human eye, thereby achieving an imaging effect similar to that of the human eye.

Description

Bionic eyeball optical module, camera simulating human eye and testing equipment

[0001] This application claims priority to Chinese Patent Application No. 202411545909.5, filed on October 31, 2024, entitled "Bionic Eyeball Optical Module, Camera Simulating Human Eye and Testing Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of bionic eye technology, and more specifically, to a bionic eye optical module, a camera simulating a human eye, and a testing device simulating a human eye. Background Technology

[0003] Humans perceive the vast majority of information in the objective world through visual information obtained by their eyes. For various devices that simulate the human eye, how to achieve a realistic simulation of the human eye is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] In a first aspect, embodiments of this application provide a bionic eye optical module, including a corneal lens (1), a dimming film (2), and an imaging lens group (4) arranged sequentially along the incident optical axis. The distance between the dimming film (2) and the front surface of the corneal lens (1) is 3mm to 5mm, and the light-transmitting area of ​​the dimming film (2) is adjustable. The optical power of the corneal lens (1) is negative, and the overall optical power of the imaging lens group (4) is positive.

[0005] In some embodiments, the distance between the dimming film (2) and the front surface of the corneal lens (1) is 3.5 mm; or,

[0006] The imaging lens group (4) includes at least one set of cemented lenses and at least one monolithic lens, wherein the refractive index of each lens in the imaging lens group (4) and the corneal lens (1) is greater than 1.5; or,

[0007] Functional films are provided on the anterior and posterior surfaces of the corneal lens (1), the functional films being used to achieve infrared reflection of the bionic eyeball; preferably, the material of the functional films is magnesium fluoride; or,

[0008] The field of view of the bionic eye optical module is less than 35°; or...

[0009] The Abbe number of each lens in the imaging lens group (4) and the Abbe number of the corneal lens (1) are greater than 20; or,

[0010] Each lens in the imaging lens group (4) and the corneal lens (1) are made of glass; or,

[0011] It also includes a protective glass (5) located furthest from the corneal lens (1).

[0012] In some embodiments, the curvature of the anterior surface of the corneal lens (1) ranges from 7.5 mm to 8.0 mm, the curvature of the posterior surface of the corneal lens (1) ranges from 6.5 mm to 7.0 mm, and / or the thickness of the corneal lens (1) ranges from 500 μm to 600 μm; preferably,

[0013] The curvature of the anterior surface of the corneal lens (1) is 7.8 mm, and the curvature of the posterior surface of the corneal lens (1) is 6.7 mm.

[0014] In some embodiments, the imaging lens group (4) includes a first lens (41) disposed adjacent to the dimming film (2) and a first cemented lens group disposed adjacent to the first lens (41);

[0015] The optical power of the first lens (41) is positive;

[0016] The first cemented lens group includes a second lens (42) and a third lens (43), wherein one of the second lens (42) and the third lens (43) has a positive optical power and the other lens has a negative optical power.

[0017] In some embodiments, a filter (3) is disposed between the first lens (41) and the first cemented lens group, the filter (3) being used to absorb or reflect infrared light.

[0018] In some embodiments, the imaging lens group (4) further includes a fourth lens (44) and a fifth lens (45) arranged sequentially along the incident optical axis, wherein the fourth lens (44) is located on the light-emitting side of the first cemented lens group;

[0019] The fourth lens (44) and the fifth lens (45) have opposite optical powers.

[0020] In some embodiments, the imaging lens group (4) further includes a second cemented lens group located between the second lens (42) and the third lens (43); the second cemented lens group includes a sixth lens (46) and a seventh lens (47), wherein one of the sixth lens (46) and the seventh lens (47) has a positive optical power and the other lens has a negative optical power.

[0021] In some embodiments, the front surface of the corneal lens (1) is convex, and the rear surface of the corneal lens (1) is concave;

[0022] The first lens (41) is a biconvex lens, and the curvature of the front surface of the first lens (41) is 30 to 33 times that of the rear surface of the first lens (41).

[0023] The second lens (42) is a biconcave lens;

[0024] The third lens (43) is a biconvex lens;

[0025] The fourth lens (44) is a biconvex lens;

[0026] The front surface of the sixth lens (46) is convex, the rear surface of the sixth lens (46) is concave, and the curvature of the front surface of the sixth lens (46) is 4 to 5 times the curvature of the rear surface of the sixth lens (46).

[0027] The front surface of the seventh lens (47) is convex, the rear surface of the seventh lens (47) is concave, and the curvature of the rear surface of the seventh lens (47) is 8 to 9 times the curvature of the front surface of the seventh lens (47).

[0028] The front surface of the fifth lens (45) is concave, the rear surface of the fifth lens (45) is convex, and the curvature of the rear surface of the fifth lens (45) is 3 to 4 times the curvature of the front surface of the fifth lens (45).

[0029] Secondly, embodiments of this application also provide a camera that simulates a human eye. The camera that simulates a human eye includes the bionic eyeball optical module described in the first aspect.

[0030] Thirdly, embodiments of this application also provide a testing device for simulating a human eye. This testing device includes a camera simulating a human eye as described in the second aspect.

[0031] According to embodiments of this application, by combining a corneal lens, a dimming film, and an imaging lens group, the optical module can simulate the imaging process of the human eye, achieving an imaging effect similar to that of the human eye. Furthermore, the dimming film design allows the optical module to adaptively adjust the amount of light transmitted according to the intensity of ambient light, thereby improving the adaptability and flexibility of imaging. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only a part of the drawings in this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 shows the optical architecture of the bionic eyeball optical module provided in the embodiment of this application.

[0034] Figures 2a-2h show the dot array diagrams of the bionic eyeball optical module provided in the embodiments of this application.

[0035] Figures 3a-3e show the MTF curves of the bionic eyeball optical module provided in the embodiments of this application.

[0036] Figure 4 shows the relative illumination diagram of the bionic eyeball optical module provided in the embodiment of this application.

[0037] Explanation of reference numerals in the attached diagram: 1. Corneal lens; 2. Dimming film; 3. Filter; 4. Imaging lens group; 41. First lens; 42. Second lens; 43. Third lens; 44. Fourth lens; 45. Fifth lens; 46. Sixth lens; 47. Seventh lens; 5. Protective glass. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] This application provides a bionic eye optical module. Referring to FIG1, the bionic eye optical module includes: a corneal lens 1, a dimming film 2, and an imaging lens group 4 arranged sequentially along the incident optical axis. The distance between the dimming film 2 and the front surface of the corneal lens 1 is 3mm to 5mm, and the light-transmitting area of ​​the dimming film 2 is adjustable. The optical power of the corneal lens 1 is negative, and the overall optical power of the imaging lens group 4 is positive.

[0040] In this embodiment, the bionic eyeball optical module is an optical system that simulates the structure and function of the human eyeball, mainly achieving an imaging effect similar to that of the human eye through optical design. The bionic eyeball optical module has a corneal lens 1, a dimming film 2, and an imaging lens group 4 arranged sequentially along the incident optical axis.

[0041] The corneal lens 1 is located at the very front of the optical module and is the first part that light comes into contact with. The corneal lens 1 has a negative optical power, which means that it has the function of diverging light, similar to the cornea of ​​the human eye. The corneal lens 1 is used to initially adjust the direction and divergence of light, providing suitable light input for the subsequent dimming film 2 and imaging lens group 4.

[0042] The dimming film 2 is located on the light-emitting side of the corneal lens 1. Specifically, the corneal lens 1 diverges light so that the light can pass through the light-transmitting area of ​​the dimming film 2 and be received by the imaging lens group 4 for subsequent imaging.

[0043] The dimming film 2 is located between the corneal lens 1 and the imaging lens group 4, maintaining a certain distance from the front surface of the corneal lens 1. The distance between the dimming film 2 and the front surface of the corneal lens 1 is limited to the range of 3mm to 5mm to simulate the distance between the iris and cornea of ​​the human eye along the axis of the eyeball.

[0044] Specifically, by setting the distance between the dimming film 2 and the front surface of the corneal lens 1 within the range of 3mm to 5mm, the relative positional relationship between the iris and cornea in the human eye can be simulated, thereby more realistically reproducing the imaging process of the human eye.

[0045] Furthermore, the distance between the dimming film 2 and the corneal lens 1 has a significant impact on the imaging effect. If the distance is too short, the light will be excessively interfered with when passing through the dimming film 2, affecting the image sharpness; if the distance is too long, it will increase light scattering and loss, reducing the image brightness. Therefore, limiting the distance to the range of 3mm to 5mm can optimize light transmission efficiency and image quality while ensuring image sharpness. Preferably, the distance between the dimming film 2 and the front surface of the corneal lens 1 is 3.5mm to 4.5mm.

[0046] In the bionic eye's optical module, the dimming film 2 acts similarly to the iris, changing the amount of light transmitted by adjusting its light-transmitting area. This means that the dimming film 2 can adjust the amount of light transmitted as needed. This design helps to simulate the pupillary adjustment function of the human eye, adaptively adjusting the amount of light transmitted according to the intensity of ambient light.

[0047] For example, by controlling the light-transmitting area of ​​the dimming film 2 electronically, the amount of light transmitted can be precisely adjusted, thereby simulating the response of the human eye pupil under different lighting conditions.

[0048] The dimming film 2 is typically made by injecting a liquid crystal / polymer hybrid material between two transparent conductive films. In the absence of an electric field, the dimming film 2 is opaque. When an alternating current is applied, the liquid crystal molecules align in an ordered manner, and the dimming film 2 transitions from the opaque state (OFF state) to the transparent state (ON state). Through the application of an electric field, rapid transitions between the ON and OFF states can be achieved.

[0049] Therefore, the dimming film 2 can simulate this light-sensing adaptive adjustment mechanism through electronic control. When the external light changes, the control system can sense and adjust the voltage or current applied to the dimming film 2, thereby changing the size and shape of its light-transmitting area and achieving precise control over the amount of light transmitted.

[0050] The imaging lens group 4 is located at the rear end of the optical module, close to the photosensitive element (such as an image sensor). The imaging lens group 4 contains at least one lens, and the number of lenses in the imaging lens group 4 is related to the thickness of each imaging lens group 4, as well as its optical parameters such as refractive index and curvature. In other words, by properly setting the optical parameters of the imaging lens, an imaging effect similar to that of the human eye's lens can be achieved through a single imaging lens. Alternatively, by properly setting and combining the optical parameters of multiple imaging lenses, an imaging effect similar to that of the human eye's lens can also be achieved through two, three, or more imaging lenses.

[0051] The imaging lens group 4 has a positive optical power, meaning it has the function of converging light, similar to the lens of the human eye. The imaging lens group 4 is used to further converge the light after it has been adjusted by the corneal lens 1 and the dimming film 2, forming a clear image. The design and optimization of the imaging lens group 4 are crucial for improving image resolution and clarity.

[0052] Therefore, in this embodiment, by combining the corneal lens 1, the dimming film 2, and the imaging lens group 4, the optical module can simulate the imaging process of the human eye and achieve an imaging effect similar to that of the human eye. Furthermore, the design of the dimming film 2 allows the optical module to adaptively adjust the amount of light transmitted according to the intensity of ambient light, thereby improving the adaptability and flexibility of the imaging process.

[0053] In a further embodiment, the distance between the dimming film 2 and the front surface of the corneal lens 1 is 3.5 mm.

[0054] In this embodiment, the distance between the dimming film 2 and the front surface of the corneal lens 1 is defined, simulating the distance between the iris and the front surface of the cornea in a human eye. This distance satisfies the distance between the iris and the front surface of the cornea in most people's eyes, thus ensuring both effective light transmission and focusing, and ensuring that the dimming film can function properly, thereby improving the overall performance and image quality of the human-eye-like camera.

[0055] In one embodiment, the imaging lens group 4 includes at least one set of cemented lenses and at least one monolithic lens, wherein the refractive index of each lens in the imaging lens group 4 and the corneal lens 1 is greater than 1.5.

[0056] In this embodiment, the imaging lens group 4 is a lens group composed of a cemented lens and a monolithic lens. The cemented lens is typically made of two materials with different refractive indices, which can correct aberrations and improve image quality. For example, the design of a cemented lens can correct various aberrations, such as spherical aberration and chromatic aberration, thereby improving image sharpness and resolution. The monolithic lens can perform specific optical functions, such as focusing or diverging light rays. Combining cemented lenses and monolithic lenses can balance image quality, manufacturing cost, and module complexity.

[0057] Furthermore, each lens in the bionic eye optical module (including the lenses in corneal lens 1 and imaging lens group 4) has a refractive index greater than 1.5 (high refractive index), meaning that light undergoes more significant refraction when passing through these lenses. High refractive index materials help reduce the thickness and weight of the lenses while maintaining the required refractive power. The use of high refractive index materials in the bionic eye optical module allows for a more compact and efficient module.

[0058] In one embodiment, functional films are provided on the anterior and posterior surfaces of the corneal lens 1, the functional films being used to achieve infrared reflection of the bionic eyeball.

[0059] In this embodiment, the corneal lens 1 possesses certain infrared reflection characteristics. Functional films are disposed on the anterior and posterior surfaces of the corneal lens 1, their main function being to enhance or achieve infrared reflection. By adding functional films, the bionic eyeball can acquire specific reflective characteristics in the infrared band, thereby meeting specific application requirements.

[0060] For example, the realization of infrared reflection typically relies on the specific optical properties of the material. Functional films can be made of materials with specific refractive indices and reflective properties, which are capable of selectively reflecting infrared light.

[0061] Furthermore, the material of the functional membrane can be magnesium fluoride.

[0062] For example, functional films can be deposited on the front and back surfaces of the corneal lens 1. The material of the functional film can be magnesium fluoride. Due to the high transmittance and low refractive index of magnesium fluoride in the infrared band, it can effectively reflect infrared light while maintaining a high transmittance of visible light.

[0063] For example, a specific proportion of infrared light reflection can be achieved by controlling the thickness of the functional film. The thickness of the functional film can be limited to a few nanometers or a few hundred micrometers.

[0064] In one embodiment, the curvature of the anterior surface of the corneal lens 1 ranges from 7.5 mm to 8.0 mm, and the curvature of the posterior surface of the corneal lens 1 ranges from 6.5 mm to 7.0 mm. And / or the thickness of the corneal lens 1 ranges from 500 μm to 600 μm.

[0065] In this embodiment, the curvature design of the corneal lens 1 has a significant impact on light focusing and image quality. By selecting a curvature range similar to that of the human cornea, the human-eye-like camera can more closely approximate the perception of the human eye, ensuring that light is correctly focused when passing through the lens, thereby forming a clear image.

[0066] Furthermore, the thickness of the corneal lens 1 is limited within this range to simulate the thickness of the human cornea. A thickness range of 500μm to 600μm ensures that the corneal lens 1 possesses excellent optical performance. It allows light to refract at an appropriate angle, thereby ensuring that the image can be clearly focused on the photosensitive element.

[0067] Preferably, the anterior surface curvature of the corneal lens 1 is 7.8 mm and the posterior surface curvature is 6.7 mm, so that the anterior / posterior surface curvature of the corneal lens 1 meets the corneal curvature of most people's eyes.

[0068] In one specific embodiment, the imaging lens group 4 includes a first lens 41 disposed adjacent to the dimming film 2 and a first cemented lens group disposed adjacent to the first lens 41;

[0069] The optical power of the first lens 41 is positive;

[0070] The first cemented lens group includes a second lens 42 and a third lens 43, wherein one of the second lens 42 and the third lens 43 has a positive optical power and the other lens has a negative optical power.

[0071] In this embodiment, the imaging lens group 4 includes a first lens 41 and a first cemented lens group. The first lens 41 is designed to have positive optical power, which means that the first lens 41 is capable of converging light rays. Specifically, the first lens group 41 converges the light rays it receives to transmit them to the first cemented lens group.

[0072] The first cemented lens group consists of a second lens 42 and a third lens 43, which are tightly cemented together to form a single optical element. Of the second lens 42 and the third lens 43, one has positive optical power and the other has negative optical power. This combination of positive and negative optical power lenses effectively corrects chromatic aberration, the difference in focusing position of light of different wavelengths as they pass through the lens. This is crucial for improving image quality. The cemented lens group design also reduces other types of aberrations, such as spherical aberration and coma, which affect image sharpness and clarity.

[0073] For example, the optical power of the second lens 42 is positive and the optical power of the third lens 43 is negative; or the optical power of the second lens 42 is negative and the optical power of the third lens 43 is positive. Specifically, referring to Figure 1, the second lens 42 is a biconcave lens with negative optical power, and the third lens 43 is a biconvex lens with positive optical power.

[0074] In one embodiment, a filter 3 is disposed between the first lens 41 and the first cemented lens group, the filter 3 being used to absorb or reflect infrared light.

[0075] In this embodiment, the filter 3 is placed between the first lens 41 and the first cemented lens group. This positioning ensures that light is processed by the filter 3 before passing through the imaging lens group 4.

[0076] The presence of filter 3 does not significantly alter other optical properties of the imaging lens group 4, such as focal length and aberrations. However, it does have a significant impact on the spectral composition, improving image quality or meeting specific application requirements by filtering out or reducing infrared light.

[0077] For example, the filter 3 is a cutoff filter 3, or a specific film layer can be provided on the filter 3 to achieve the effect of absorbing or reflecting infrared light.

[0078] In a further embodiment, the imaging lens group 4 further includes a fourth lens 44 and a fifth lens 45 arranged sequentially along the incident optical axis, wherein the fourth lens 44 is located on the light-emitting side of the first cemented lens group; the optical powers of the fourth lens 44 and the fifth lens 45 are opposite.

[0079] In this embodiment, in addition to the imaging lens group 4 including a first lens 41 and a first cemented lens group (a second lens 42 and a third lens 43 cemented together), the imaging lens group 4 further includes a fourth lens 44 and a fifth lens 45 arranged sequentially along the optical axis, with the fourth lens 44 located on the light-emitting side of the first cemented lens group. The fourth lens 44 and the fifth lens 45 have opposite optical powers.

[0080] For example, the optical power of the fourth lens 44 can be positive, and the optical power of the fifth lens 45 can be negative, or the optical power of the fourth lens 44 can be negative, and the optical power of the fifth lens 45 can be positive. Specifically, referring to Figure 1, the fourth lens 44 is a biconvex lens with positive optical power, and the fifth lens 45 is a concave-convex lens with negative optical power.

[0081] Specifically, since the fourth lens 44 and the fifth lens 45 have opposite optical powers, they can compensate for each other's aberrations, such as spherical aberration and coma aberration. This compensation helps improve image quality and reduce image distortion.

[0082] Furthermore, by adjusting the radius of curvature and optical power of the fourth lens 44 and the fifth lens 45, the curvature of the image plane can be optimized, making the image flatter and thus improving the image clarity.

[0083] In a further embodiment, the imaging lens group 4 further includes a second cemented lens group located between the fourth lens 44 and the fifth lens 45; the second cemented lens group includes a sixth lens 46 and a seventh lens 47, wherein one of the sixth lens 46 and the seventh lens 47 has a positive optical power and the other lens has a negative optical power.

[0084] In this embodiment, in addition to the imaging lens group 4 including a first lens 41, a first cemented lens group (a second lens 42 and a third lens 43 cemented together), a fourth lens 44, and a fifth lens 45, the imaging lens group 4 further includes a second cemented lens group. The second cemented lens group is located between the fourth lens 44 and the fifth lens 45; the second cemented lens group includes a sixth lens 46 and a seventh lens 47, wherein one of the sixth lens 46 and the seventh lens 47 has a positive optical power, and the other lens has a negative optical power.

[0085] Specifically, the design of the sixth lens 46 and the seventh lens 47 with opposite optical powers allows them to compensate for each other's aberrations, such as spherical aberration and coma. This compensation helps reduce image distortion during the imaging process and improves image sharpness.

[0086] Furthermore, the imaging performance of the imaging lens group 4 can be further optimized by adjusting parameters such as the curvature and refractive index of the sixth lens 46 and the seventh lens 47. For example, this can improve image resolution, contrast, and color reproduction.

[0087] For example, the optical power of the sixth lens 46 is positive and the optical power of the seventh lens 47 is negative, or the optical power of the sixth lens 46 is negative and the optical power of the seventh lens 47 is positive. Specifically, referring to Figure 1, the sixth lens 46 is a convex-concave lens with negative optical power, and the seventh lens 47 is a biconvex lens with positive optical power.

[0088] In one specific embodiment, referring to FIG1, the optical module of the bionic eyeball includes, along the incident optical axis: a corneal lens 1, a first lens 41, a filter 3, a first cemented lens group (a second lens 42 and a third lens 43 cemented together), a fourth lens 44, a second cemented lens group (a sixth lens 46 and a seventh lens 47), and a fifth lens 45.

[0089] The corneal lens 1 has a convex front surface and a concave rear surface. The first lens 41 is a biconvex lens, and the curvature of the front surface of the first lens 41 is 30 to 33 times that of the rear surface. The second lens 42 is a biconcave lens. The third lens 43 is a biconvex lens. The fourth lens 44 is a biconvex lens.

[0090] The front surface of the sixth lens 46 is convex, the rear surface of the sixth lens 46 is concave, and the curvature of the front surface of the sixth lens 46 is 4 to 5 times the curvature of the rear surface of the sixth lens 46.

[0091] The front surface of the seventh lens 47 is convex, the rear surface of the seventh lens 47 is concave, and the curvature of the rear surface of the seventh lens 47 is 8 to 9 times the curvature of the front surface of the seventh lens 47.

[0092] The front surface of the fifth lens 45 is concave, the rear surface of the fifth lens 45 is convex, and the curvature of the rear surface of the fifth lens 45 is 3 to 4 times the curvature of the front surface of the fifth lens 45.

[0093] In this embodiment, the surface shape and curvature of each lens in the bionic eye optical module are defined to achieve an imaging effect similar to that of the human eye.

[0094] Specifically, the anterior surface of the corneal lens 1 is convex, and the posterior surface is concave. The curvature of the anterior surface is large enough to converge the incident light rays; the curvature of the posterior surface is relatively small to adjust the focusing position of the light rays. The specific curvature value needs to be calculated based on the imaging requirements of the entire optical module. For example, the curvature of the anterior surface of the corneal lens 1 is 7.8 mm, and the curvature of the posterior surface is 6.7 mm.

[0095] The first lens 41 has a biconvex surface, with the curvature of its front surface being significantly greater than that of its rear surface to achieve a strong focusing effect. For example, the curvature of the front surface of the first lens 41 is 899.5 mm, and the curvature of its rear surface is 28.79 mm, ensuring an optimal balance between focusing effect and aberration correction. The significant difference in curvature between the front and rear surfaces of the first lens 41 can also achieve specific light refraction effects, such as strong focusing or specific aberration correction.

[0096] The first cemented lens group is formed by cementing the second lens 42 and the third lens 43 together.

[0097] The second lens 42 has a biconcave surface. The curvature of both the front and rear surfaces of the second lens 42 should be negative to achieve a light divergence effect. The specific curvature values ​​need to be adjusted according to the focusing effect to ensure light control of the entire optical module. For example, the curvature of the front surface of the second lens 42 is 5.62 mm, and the curvature of the rear surface is 8.868 mm.

[0098] The surface shape of the third lens 43 is opposite to that of the second lens 42; the surface shape of the third lens 43 is biconvex. The curvature of both the front and rear surfaces of the third lens 43 should be positive to achieve a focusing effect on light. For example, the curvature of the front surface of the third lens 43 is 8.868 mm, and the curvature of the rear surface is 7.907 mm.

[0099] The fourth lens 44 has a biconvex surface. The curvature of both the front and rear surfaces of the fourth lens 44 is positive, but smaller than that of the first lens 41. This is to fine-tune the focusing position of the light rays, ensuring the sharpness of the final image. For example, the curvature of the front surface of the fourth lens 44 is 15.74 mm, and the curvature of the rear surface is 26.61 mm.

[0100] The second cemented lens group is formed by cementing together the sixth lens 46 and the seventh lens 47.

[0101] The sixth lens 46 has the following surface profile: a convex front surface and a concave rear surface. The curvature of the front surface of the sixth lens 46 should be positive, and the curvature of the rear surface should be negative. By accurately calculating the curvature values, fine-tuning of light focusing and aberration correction can be achieved.

[0102] The curvature of the front surface of the sixth lens 46 is 4 to 5 times that of the rear surface. This design means that the front surface is steeper than the rear surface, which helps to achieve a stronger focusing effect, while the concave design of the rear surface is used to adjust the focusing position of the light to achieve more accurate imaging. For example, the curvature of the front surface of the sixth lens 46 is 23.9 mm, and the curvature of the rear surface is 5.525 mm.

[0103] The surface shape of the seventh lens 47 is similar to that of the sixth lens 46. The seventh lens 47 has a convex front surface and a concave rear surface. By adjusting the curvature of the seventh lens 47, the focusing position of the light can be further fine-tuned to ensure the stability of the final image.

[0104] The curvature of the rear surface of the seventh lens 47 is 8 to 9 times that of the front surface. This design makes the rear surface steeper than the front surface, which helps to further fine-tune the focusing position of the light rays and achieve more precise imaging control. At the same time, this extreme curvature ratio can also be used to correct higher-order aberrations and improve image quality. For example, the curvature of the front surface of the seventh lens 47 is 5.525 mm, and the curvature of the rear surface is 45.2 mm.

[0105] The fifth lens 45 has a concave front surface and a convex rear surface. The curvature of the front surface of the fifth lens 45 is negative, and the curvature of the rear surface is positive. By accurately calculating the curvature values, a balance between light divergence and focusing can be achieved, ensuring optimal light control for the entire optical module.

[0106] This embodiment also limits the curvature of the front and rear surfaces of the fifth lens 45 to a specific ratio (i.e., the curvature of the rear surface is 3 to 4 times that of the front surface) in order to further precisely control the focusing of light and aberration correction. Specifically, the curvature of the rear surface is 3 to 4 times that of the front surface. This design means that the rear surface is steeper than the front surface, which helps to achieve a stronger focusing effect.

[0107] For example, the front surface curvature of the fifth lens 45 is 7.543 mm, and the rear surface curvature is 22.22 mm.

[0108] By precisely defining the surface shape and curvature of each lens, the optical module can be made to simulate human eye imaging. However, it is important to note that these definitions are not fixed but require precise calculation and adjustment based on the imaging needs of the entire optical module. Furthermore, factors such as lens material selection, manufacturing processes, and compatibility with other optical components must be considered to ensure the performance and stability of the entire optical module.

[0109] In one embodiment, the field of view of the bionic eye optical module is less than 35°.

[0110] In this embodiment, the field of view of the bionic eye optical module can be determined based on a series of parameters, such as the refractive index and surface parameters of each lens in the optical module and the light-transmitting area of ​​the dimming film 2. The field of view of this bionic eye optical module is less than 35°, enabling small field-of-view imaging. When the bionic eye is applied to a camera for image acquisition, the small field of view reduces background information in the field of view, allowing the camera to focus more on the target itself and improving the accuracy of image acquisition.

[0111] In one embodiment, the Abbe number of each lens in the imaging lens group 4 and the Abbe number of the corneal lens 1 are greater than 20.

[0112] In this embodiment, to ensure high-quality imaging of the entire imaging lens group 4, the Abbe number of each lens should be greater than 20. This design helps reduce image blurring and color distortion caused by chromatic aberration, ensuring that clear and accurate visual information is received.

[0113] Furthermore, the Abbe number of corneal lens 1 is greater than 20 to ensure its ability to focus on different colors of light. This design helps reduce visual problems caused by chromatic aberration of corneal lens 1, thereby improving the overall performance of the bionic eye.

[0114] For example, the Abbe number of corneal lens 1 is 64.199. The Abbe number of the first lens 41 is 30.1. The Abbe number of the second lens 42 is 27.5. The Abbe number of the third lens 43 is 38. The Abbe number of the fourth lens 44 is 21. The Abbe number of the sixth lens 46 is 25.38. The Abbe number of the seventh lens 47 is 55. The Abbe number of the fifth lens 45 is 60.5.

[0115] In one embodiment, each lens in the imaging lens group 4 and the corneal lens 1 are made of glass.

[0116] In this embodiment, each lens in the imaging lens group 4 of the bionic eye needs to possess characteristics such as high precision, high light transmittance, and high Abbe number. Glass material is an ideal choice to meet these requirements. Furthermore, the corneal lens 1, as a crucial component of the bionic eye's optical module, has a vital impact on image quality. Choosing glass as the material for the corneal lens 1 ensures its ability to focus different colors of light, reduces chromatic aberration, and improves image clarity and accuracy.

[0117] In one embodiment, the bionic eye optical module further includes a protective glass 5 positioned furthest from the corneal lens 1. In this embodiment, the bionic eye also includes the protective glass 5, which protects other sensors such as the photosensitive chip.

[0118] In one specific embodiment, referring to FIG1, the optical module of the bionic eyeball includes, in sequence along the incident optical axis: a corneal lens 1, a first lens 41, a filter 3, a first cemented lens group (a second lens 42 and a third lens 43 cemented together), a fourth lens 44, a second cemented lens group (a sixth lens 46 and a seventh lens 47), and a fifth lens 45.

[0119] The optical parameters of the corneal lens 1 are as follows: focal length: -154.057mm; anterior surface curvature: 7.8mm; posterior surface curvature: 6.7mm; refractive index: 1.5167; Abbe number: 64.199; glass material: H-K9L.

[0120] The optical parameters of the first lens 41 are as follows: focal length: 27.6 mm; front surface curvature: 899.5 mm; rear surface curvature: 28.79 mm; refractive index: 1.9; Abbe number: 30.1; glass material: HZLAF92.

[0121] The optical parameters of the second lens 42 are as follows: focal length: -4.41mm; front surface curvature: 5.62mm; rear surface curvature: 8.868mm; refractive index: 1.7552; Abbe number: 27.5; glass material: ZF6.

[0122] The optical parameters of the third lens 43 are as follows: focal length: -6.23mm; front surface curvature: 8.868mm; rear surface curvature: 7.907mm; refractive index: 1.52; Abbe number: 38; glass material: HLAK52.

[0123] The optical parameters of the fourth lens 44 are as follows: focal length: 10.89mm; front surface curvature: 15.74mm; rear surface curvature: 26.61mm; refractive index: 1.923; Abbe number: 21; glass material: HZF62.

[0124] The optical parameters of the sixth lens 46 are as follows: focal length: -9mm; front surface curvature: 23.9mm; rear surface curvature: 5.525mm; refractive index: 1.8063; Abbe number: 25.38; glass material: ZF7.

[0125] The optical parameters of the seventh lens 47 are as follows: focal length: 10.23mm; front surface curvature: 5.525mm; rear surface curvature: 45.2mm; refractive index: 1.72; Abbe number: 55; glass material: HZPK5.

[0126] Optical parameters of the fifth lens 45: focal length: -23.76mm; front surface curvature: 7.543mm; rear surface curvature: 22.22mm; refractive index: 1.5164; Abbe number: 60.5; glass material: HQK3L.

[0127] This optical module can simulate the imaging process of the human eye, achieving an imaging effect similar to that of the human eye.

[0128] In this embodiment, referring to Figures 2a-2h, there are dot array diagrams of the bionic eye optical module focusing at infinity, 4m, 3m, 2m, 1.44m, 1.2m, 1m and 0.2m. The size of each field of view dot array diagram is close to the Airy disk.

[0129] In this embodiment, referring to Figures 3a-3e, the MTF of the bionic eye optical module at 0, 0.5, 0.7, and 1 field of view is shown. Because the field of view of the bionic eye optical module is reduced to 35°, the focal length needs to be increased to match the sensor, resulting in an increase in the F-number and a decrease in the diffraction limit. When focusing at infinity (-0.25m), the MTF of the 0-0.7 field of view at 227 lp / mm is generally above 0.5; when focusing at 0.2m, the resolution decreases slightly, but the MTF of the 0-0.5 field of view at 227 lp / mm is generally above 0.5; throughout the focusing process, the resolution of the edge field of view at 227 lp / mm is between 0.3 and 0.4.

[0130] In this embodiment, referring to Figure 4, the relative illumination across the entire field of view is above 85%.

[0131] Secondly, embodiments of this application also provide a camera that simulates a human eye. The camera that simulates a human eye includes the bionic eyeball optical module described in the first aspect.

[0132] In this embodiment, a bionic eye-shaped optical module is applied to a camera, which is a human-eye-like camera that simulates the human eye to acquire image information.

[0133] Thirdly, embodiments of this application also provide a testing device for simulating a human eye. This testing device includes a camera simulating a human eye as described in the second aspect.

[0134] In this embodiment, a human-eye-like camera is used in a testing device that can be used to test and analyze XR display devices (extended reality, including AR augmented reality, VR virtual reality, etc.).

[0135] The various embodiments in this specification are described in parallel or progressive manner. Each embodiment focuses on its differences from other embodiments, and the same or similar parts between the embodiments can be referred to mutually. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be found in the method section.

[0136] Those skilled in the art will also understand that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

Claims

1. A biomimetic eyeball optical module, characterized in that, include: A corneal lens (1), a dimming film (2), and an imaging lens group (4) are arranged sequentially along the incident optical axis. The distance between the dimming film (2) and the front surface of the corneal lens (1) is 3mm to 5mm. The light-transmitting area of ​​the dimming film (2) is adjustable. The optical power of the corneal lens (1) is negative, and the overall optical power of the imaging lens group (4) is positive.

2. The bionic eyeball optical module according to claim 1, characterized in that, The distance between the dimming film (2) and the front surface of the corneal lens (1) is 3.5 mm; or, The imaging lens group (4) includes at least one set of cemented lenses and at least one monolithic lens, wherein the refractive index of each lens in the imaging lens group (4) and the corneal lens (1) is greater than 1.5; or, Functional films are provided on the anterior and posterior surfaces of the corneal lens (1), the functional films being used to achieve infrared reflection of the bionic eyeball; preferably, the material of the functional films is magnesium fluoride; or, The field of view of the bionic eye optical module is less than 35°; or... The Abbe number of each lens in the imaging lens group (4) and the Abbe number of the corneal lens (1) are greater than 20; or, Each lens in the imaging lens group (4) and the corneal lens (1) are made of glass; or, It also includes a protective glass (5) located furthest from the corneal lens (1).

3. The bionic eyeball optical module according to any one of claims 1-2, characterized in that, The curvature of the anterior surface of the corneal lens (1) ranges from 7.5 mm to 8.0 mm, and the curvature of the posterior surface of the corneal lens (1) ranges from 6.5 mm to 7.0 mm; and / or the thickness of the corneal lens (1) ranges from 500 μm to 600 μm; preferably, The curvature of the anterior surface of the corneal lens (1) is 7.8 mm, and the curvature of the posterior surface of the corneal lens (1) is 6.7 mm.

4. The bionic eyeball optical module according to any one of claims 1-3, characterized in that, The imaging lens group (4) includes a first lens (41) disposed adjacent to the dimming film (2) and a first cemented lens group disposed adjacent to the first lens (41); The optical power of the first lens (41) is positive; The first cemented lens group includes a second lens (42) and a third lens (43), wherein one of the second lens (42) and the third lens (43) has a positive optical power and the other lens has a negative optical power.

5. The bionic eyeball optical module according to claim 4, characterized in that, A filter (3) is disposed between the first lens (41) and the first cemented lens group, the filter (3) being used to absorb or reflect infrared light.

6. The bionic eyeball optical module according to claim 4, characterized in that, The imaging lens group (4) further includes a fourth lens (44) and a fifth lens (45) arranged sequentially along the incident optical axis, wherein the fourth lens (44) is located on the light-emitting side of the first cemented lens group; The fourth lens (44) and the fifth lens (45) have opposite optical powers.

7. The bionic eyeball optical module according to claim 6, characterized in that, The imaging lens group (4) further includes a second cemented lens group, which is located between the second lens (42) and the third lens (43); the second cemented lens group includes a sixth lens (46) and a seventh lens (47), wherein the optical power of one of the sixth lens (46) and the seventh lens (47) is positive and the optical power of the other lens is negative.

8. The bionic eyeball optical module according to claim 7, characterized in that, The front surface of the corneal lens (1) is convex, and the rear surface of the corneal lens (1) is concave. The first lens (41) is a biconvex lens, and the curvature of the front surface of the first lens (41) is 30 to 33 times that of the rear surface of the first lens (41). The second lens (42) is a biconcave lens; The third lens (43) is a biconvex lens; The fourth lens (44) is a biconvex lens; The front surface of the sixth lens (46) is convex, the rear surface of the sixth lens (46) is concave, and the curvature of the front surface of the sixth lens (46) is 4 to 5 times the curvature of the rear surface of the sixth lens (46). The front surface of the seventh lens (47) is convex, the rear surface of the seventh lens (47) is concave, and the curvature of the rear surface of the seventh lens (47) is 8 to 9 times the curvature of the front surface of the seventh lens (47). The front surface of the fifth lens (45) is concave, the rear surface of the fifth lens (45) is convex, and the curvature of the rear surface of the fifth lens (45) is 3 to 4 times the curvature of the front surface of the fifth lens (45).

9. A camera that simulates the human eye, characterized in that, The camera that simulates a human eye includes a bionic eye optical module as described in any one of claims 1-8.

10. A testing device simulating the human eye, characterized in that, Including the camera that simulates a human eye as described in claim 9.

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