Eyepiece system and optical apparatus

Abstract

The embodiment of the invention provides an eyepiece system and optical equipment. The eyepiece system comprises a first element group and a second element group; the first element group is arranged close to the human eye side and comprises a first lens, the first lens is provided with a first surface close to the display side and a second surface close to the human eye side, the first surface is provided with a light splitting element and a circularly polarized light generation assembly, and the circularly polarized light generation assembly is located on the side, away from the first lens, of the light splitting element; a first phase retarder and a polarization reflection element are sequentially arranged on the second surface; the second element group is arranged close to the display side and comprises at least two lenses, and the Abbe number of at least one lens is less than or equal to 40; the eyepiece system satisfies the following conditions: 0.01 < = (D1max * phi1) / (D2max * phi2) < = 0.3; wherein phi 1 is the focal power of the first element group, phi 2 is the focal power of the second element group, D1 is the maximum effective optical aperture of the first element group, and D2 is the maximum effective optical aperture of the second element group.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical imaging technology. More specifically, the embodiments of the present application relate to an eyepiece system and an optical device. Background Art

[0002] Traditional eyepiece systems often use a straight-through optical solution. To achieve a certain level of optical performance, this solution typically requires a large number of lenses (usually ≥6), resulting in a bulky eyepiece system, a relatively small field of view, inadequate chromatic aberration correction, and compromised image quality. While existing folded optical path solutions can reduce size, they still present the following challenges: complex polarization optical path design, insufficient ghost suppression, and poor optical parameter matching, impacting the balance between image quality and volume. Summary of the Invention

[0003] The purpose of this application is to provide a new technical solution for eyepiece systems and optical equipment.

[0004] In a first aspect, an embodiment of the present application provides an eyepiece system, comprising a first element group and a second element group arranged along the same optical axis, wherein:

[0005] The first element group is disposed near the human eye side and includes a first lens, the first lens having a first surface near the display side and a second surface near the human eye side, and a beam splitter and a circularly polarized light generating component are disposed on the first surface, the circularly polarized light generating component is located on a side of the beam splitter facing away from the first lens, with no air gap between the two; a first phase retarder and a polarized reflective element are disposed on the second surface, and the first phase retarder is located on the optical path between the beam splitter and the polarized reflective element;

[0006] The second element group is arranged close to the display side and includes at least two lenses, and the Abbe number of at least one lens is ≤40;

[0007] The eyepiece system satisfies the relationship: in, is the optical power of the first element group, is the optical power of the second element group, D1 is the maximum effective optical aperture of the first element group, and D2 is the maximum effective optical aperture of the second element group.

[0008] Optionally, the optical power of the first element group is satisfy:

[0009] The optical power of the second element group satisfy:

[0010] Optionally, the Abbe number of the lens closest to the first lens in the second element group is ≤40.

[0011] Optionally, the second element group includes a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along the optical axis from the human eye side to the display side, wherein the Abbe number of the second lens is ≤40.

[0012] Optionally, the second lens has a third surface close to the display side, the third surface is concave toward the display side, and satisfies the relationship: 0.03≤|SAG1| / D61≤0.1, where: SAG1 is the sag of the third surface, and D61 represents the effective optical aperture of the third surface.

[0013] Optionally, the Abbe number of the fourth lens is ≤40.

[0014] Optionally, the fourth lens has a seventh surface close to the display side, the seventh surface is concave toward the display side, and satisfies the relationship: 0.05≤|SAG2| / D41≤0.1, wherein: SAG2 is the sag of the seventh surface, and D41 represents the effective optical aperture of the seventh surface.

[0015] Optionally, the effective optical aperture of each lens in the eyepiece system satisfies the following decreasing relationship: D1>D2>D3>D4>D5, wherein D1 is the effective optical aperture of the first lens, and D2 to D5 are the effective optical apertures of the second lens to the fifth lens respectively.

[0016] Optionally, the center thickness T3 of the third lens and the total optical length TTL of the eyepiece system satisfy: 0.2≤T3 / TTL≤0.3.

[0017] Optionally, the center thickness T1 of the first lens is 4 mm ≤ T1 ≤ 16 mm;

[0018] The center thickness T2 of each lens in the second element group is 1 mm ≤ T2 ≤ 8 mm.

[0019] Optionally, the circularly polarized light generating assembly is glued to a side of the light splitting element away from the first lens; or,

[0020] A lens is provided between the circularly polarized light generating component and the light splitting element;

[0021] The circularly polarized light generating assembly includes a second phase retarder, a second polarizing element, and a third phase retarder which are stacked in sequence.

[0022] Optionally, the optical power of each lens in the eyepiece system is as follows:

[0023] The optical power of the first lens for

[0024] The optical power of the second lens for

[0025] The optical power of the third lens for

[0026] The optical power of the fourth lens for

[0027] The optical power of the fifth lens for

[0028] The eyepiece system further includes a display, which is arranged on a side of the second element group facing away from the first element group. A protective glass is provided on the light-emitting surface of the display, and the size of the display is less than 0.5 inches.

[0029] Optionally, the eyepiece system satisfies: 0.9≤TTL / f≤1.1; wherein TTL is the total optical length of the eyepiece system, and f is the total focal length of the eyepiece system.

[0030] Optionally, the first element group further includes a first polarizing element stacked on a surface of the polarizing reflective element facing away from the first phase retarder, and the first polarizing element, the polarizing reflective element and the first phase retarder form a composite film layer structure.

[0031] In a second aspect, an embodiment of the present application provides an optical device, comprising:

[0032] The eyepiece system according to the first aspect; and

[0033] An objective lens is located on the display side of the eyepiece system.

[0034] The beneficial effects of this application are:

[0035] The eyepiece system provided in the embodiments of the present application aims to provide a new solution to the problems existing in the prior art eyepiece systems, such as large size, limited field of view, insufficient chromatic aberration correction, and obvious ghosting.

[0036] Specifically, this eyepiece system utilizes a folded optical path design, dividing the entire system into a first element group closest to the eye and a second element group closest to the display, achieving a compact optical structure and optimized performance. In this design, the layout of the beam splitter and circularly polarized light generating components has been carefully optimized, with no air gap between them. This effectively reduces reflections and scattering in the optical path, significantly minimizing ghosting and stray light.

[0037] Furthermore, the eyepiece system of the present invention ensures superior optical performance with high resolution, low distortion, and excellent image quality by regulating the ratio between the optical power and maximum effective optical aperture of the first and second element groups. This control not only achieves the optical effects of a wide field of view and wide aperture angle, but also ensures excellent imaging quality and visual experience while maintaining a compact structure.

[0038] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0040] Figure 1 One of the optical architecture diagrams of the eyepiece system provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of each film layer provided on the first surface of the embodiment of the present application;

[0042] Figure 3 A schematic diagram of the structure of each film layer provided on the second surface of the embodiment of the present application;

[0043] Figure 4 for Figure 1 Dot array diagram of the provided eyepiece system;

[0044] Figure 5 for Figure 1 Provided MTF graph of the eyepiece system;

[0045] Figure 6 for Figure 1 Provided field curvature and distortion diagrams of the eyepiece system;

[0046] Figure 7 for Figure 1 Vertical chromatic aberration diagram of the provided eyepiece system;

[0047] Figure 8 The second optical architecture diagram of the eyepiece system provided in an embodiment of the present application;

[0048] Figure 9 for Figure 8 Dot array diagram of the provided eyepiece system;

[0049] Figure 10 for Figure 8 Provided MTF graph of the eyepiece system;

[0050] Figure 11 for Figure 8 Provided field curvature and distortion diagrams of the eyepiece system;

[0051] Figure 12 for Figure 8 A diagram of vertical chromatic aberration for the provided eyepiece system.

[0052] Description of reference numerals:

[0053] 1. Display; 2. Protective glass;

[0054] 3. Fifth lens; 31. Ninth surface; 32. Tenth surface;

[0055] 4. Fourth lens; 41. Seventh surface; 42. Eighth surface;

[0056] 5. Third lens; 51. Fifth surface; 52. Sixth surface;

[0057] 6. Second lens; 61. Third surface; 62. Fourth surface;

[0058] 7. First lens; 71. First surface; 710. Beam splitter; 711. First anti-reflection film; 712. Second phase retarder; 713. Second polarizer; 714. Third phase retarder; 72. Second surface; 721. Second anti-reflection film; 722. First polarizer; 723. Polarized reflective element; 724. First phase retarder;

[0059] 01. Human eye. DETAILED DESCRIPTION

[0060] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0061] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0062] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0063] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0064] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0065] The eyepiece system and optical device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0066] According to one embodiment of the present application, an eyepiece system is provided, see Figure 1 and Figure 8 The eyepiece system includes a first element group and a second element group arranged along the same optical axis, wherein: the first element group is arranged close to the human eye side, including a first lens 7, the first lens 7 has a first surface 71 close to the display side and a second surface 72 close to the human eye side, and the first surface 71 is provided with a beam splitter 710 and a circularly polarized light generating component, the circularly polarized light generating component is located on the side of the beam splitter 710 away from the first lens 7, and there is no air gap between the two; the second surface 72 is provided with a first phase retarder 724 and a polarized reflection element 723, and the first phase retarder 724 is located on the optical path between the beam splitter 710 and the polarized reflection element 723; the second element group is arranged close to the display side, including at least two lenses, and the Abbe number of at least one lens is ≤40; the eyepiece system satisfies the relationship: in, is the optical power of the first element group, is the optical power of the second element group, D1 is the maximum effective optical aperture of the first element group, and D2 is the maximum effective optical aperture of the second element group.

[0067] The eyepiece system provided in the embodiment of the present application, as a new near-eye optical system design, has broad application potential and is particularly suitable for optical devices such as sights that have high requirements for optical performance.

[0068] The functions of the main components of the eyepiece system provided in the embodiments of the present application are described in detail as follows.

[0069] The eyepiece system provided in the embodiment of the present application is shown in FIG. Figure 1 and Figure 8The eyepiece system is configured with a first element group, a second element group and a display 1 in sequence along the same optical axis.

[0070] The first element group is located on the side close to the human eye 01. As one of the components of the eyepiece system, it includes at least one lens, namely the first lens 7. The first lens 7 has two key surfaces:

[0071] First surface 71 (close to the display side, i.e. the side where the display 1 is located): on this surface, a light splitting element 710 and a circularly polarized light generating component are sequentially arranged, see Figure 2 . The spectroscopic element 710, for example, adopts a semi-transparent and semi-reflective film design, which can be used to partially transmit and partially reflect light to achieve folding of the light path and distribution of light. The circularly polarized light generating component is used to convert the light emitted from the display side into circularly polarized light. The design of the circularly polarized light generating component introduced in this application helps to reduce the reflection and scattering of light during the propagation process, thereby significantly reducing the generation of ghost images and stray light, and improving the clarity of imaging.

[0072] The second surface 72 (close to the human eye side, i.e. the side where the human eye 01 is located): a first phase retarder 724 and a polarization reflection element 723 are sequentially arranged on this surface, see Figure 3 The first phase retarder 724 is used to further adjust the polarization state of the light, ensuring that the light propagates in a specific polarization direction. The polarization reflective element 723 is used to reflect light with a specific polarization state, returning it to the optical path and participating in imaging. This design is the key to achieving optical path folding and efficient imaging.

[0073] For a specific example, see Figure 1 The light splitting element 710 uses a semi-transparent and semi-reflective film, which can achieve partial transmission and partial reflection of light and is a key component for light path folding and light distribution. Figure 2 The circularly polarized light generating assembly is mainly composed of a second phase retarder 712, a second polarizing element 713, and a third phase retarder 714 stacked in sequence. This assembly structure is designed to convert the light emitted from the display 1 into circularly polarized light, effectively reducing the reflection and scattering of the light during propagation, thereby reducing the generation of ghost images and stray light, and improving imaging quality. The first phase retarder 724 is a quarter-wave plate, and the polarizing reflective element 723 is a polarizing reflective film. Figure 3The first phase retarder 724 and the polarizing reflective element 723 form a composite film structure. The first phase retarder 724 is used to adjust the polarization state of light to ensure that the light propagates in a specific polarization direction. The polarizing reflective element 723 and the first phase retarder 724 are stacked together to reflect light with a specific polarization state, returning it to the optical path and participating in imaging. The optical film design in this specific example is a key step in achieving optical path folding and efficient imaging.

[0074] In the embodiment of the present application, the introduction of the circularly polarized light generating component realizes the conversion of the light emitted from the display side into circularly polarized light, and there is no air gap between the circularly polarized light generating component and the spectroscopic element 710, which effectively eliminates the reflection ghost generated by the lens between the circularly polarized light generating component and the display 1.

[0075] The second element group is located on the side of the entire eyepiece system close to the display 1 and is another key component of the eyepiece system. The second element group is designed to include at least two lenses, which together form a straight-through optical path structure.

[0076] In particular, in the second element group, at least one lens element has an Abbe number of no more than 40. In this design, the selection of at least one lens element with an Abbe number ≤ 40 is intended to leverage its properties for chromatic aberration correction, thereby effectively improving image color reproduction and ensuring a more realistic and natural visual experience for users.

[0077] The relationship described in the embodiments of this application A key optical design parameter ensures the high-performance optical performance of the eyepiece system in terms of high resolution, low distortion, and excellent image quality. Controlling this proportional relationship not only achieves the optical effects of a large field of view (≥35°) and a large aperture angle (≥13°), but also enables the eyepiece system to maintain a compact structure while providing excellent imaging quality and visual experience.

[0078] Among them, D1 max and D2 max These parameters determine the maximum range of light that the eyepiece system can receive and transmit, directly affecting the system's field of view and the amount of light entering. and Represent the optical power of the first element group and the second element group respectively. Optical power is a measure of the optical

[0079] It should be noted that the wide aperture angle is related to the aperture or entrance pupil diameter of the optical system, which determines the maximum angle of light that the system can receive or transmit. In the eyepiece system provided in the embodiment of the present application, the wide aperture angle means that the eyepiece system can capture or display image information within a wider field of view without increasing the size of the display 1, thereby improving the user's viewing experience.

[0080] The combination of a large aperture angle and a wide field of view contributes to the high performance of this eyepiece system. The wide field of view refers to the maximum angular range the system can observe, while the large aperture angle ensures that the system can effectively receive or transmit light within this wide field of view, thereby maintaining image clarity and brightness.

[0081] The relationship in the embodiment of the present application optimizes the overall performance of the eyepiece system by comparing the product of the maximum effective optical aperture of the first element group and its optical power with the corresponding parameters of the second element group. Specifically, this relationship ensures the following optical performance: (1) High resolution: By controlling the ratio of optical aperture and optical power, aberrations can be reduced and image clarity can be improved. (2) Low distortion: A reasonable distribution of optical aperture and optical power helps to reduce imaging distortion and maintain image accuracy. (3) Good image quality: The overall design ensures efficient transmission and imaging of light in the system, improving image quality.

[0082] when If the ratio is not within the range of 0.01 to 0.3, the following problems may occur: (1) Decreased image clarity: When the ratio is too high or too low, the aberration may increase and the resolution may decrease. (2) Increased distortion: Unreasonable optical aperture and optical power distribution may increase imaging distortion, affecting image accuracy. (3) Deterioration of image quality: The overall design may not be able to effectively transmit and image light, resulting in a decrease in image quality, and users may not be able to obtain a clear visual experience. (4) Reduced system efficiency: Unreasonable parameter distribution may increase the loss of light in the system, reducing the overall efficiency of the system.

[0083] Therefore, when designing the eyepiece system of the embodiment of the present application, it is necessary to control The value is between 0.01 and 0.3 to ensure high optical performance of the eyepiece system.

[0084] The eyepiece system provided in the embodiments of the present application optimizes the system structure and improves performance by combining a folded optical path with a straight optical path. Specifically, the eyepiece system is divided into a first element group near the human eye 01 and a second element group near the display side. This optical path design effectively reduces the number of lenses in the system, thereby promoting the miniaturization of the eyepiece system and meeting the compactness requirements of modern equipment.

[0085] The eyepiece system of the present application ensures superior optical performance with high resolution, low distortion, and excellent image quality by regulating the ratio between the optical power and maximum effective optical aperture of the first and second element groups. This control not only achieves the optical effects of a wide field of view and wide aperture angle, but also ensures excellent imaging quality and visual experience while maintaining a compact structure.

[0086] Furthermore, the absence of an air gap between the beam splitter 710 and the circularly polarized light generating assembly is a key feature of this application. This design effectively reduces reflections and scattering in the optical path, thereby reducing ghosting and stray light, significantly improving image clarity and contrast, and providing users with a clearer, more realistic visual experience.

[0087] In the second element group, the present application specifically selects at least one lens with an Abbe number ≤ 40. This selection is based on the close relationship between the Abbe number and the dispersion ability of the lens, which helps to correct chromatic aberration, thereby improving the color reproduction of the image and making the picture more vivid and realistic.

[0088] In some examples of the present application, the optical power of the first element group is satisfy: The optical power of the second element group satisfy:

[0089] These optical power ranges are key parameters in the design of the eyepiece system provided in this application, and they have a very important impact on the overall performance of the system.

[0090] The optical power of the first element group The technical effect analysis is as follows:

[0091] The first element group is close to the human eye 01, and its optical power Between 0 and 0.005, it is mainly responsible for collecting light from a large field of view, ensuring that the light can efficiently enter the human eye 01, and improving the brightness and clarity of the image. The field of view of the entire eyepiece system can be optimized to enable users to obtain a wider field of view, such as a field of view ≥ 35°.

[0092] The optical power of the second element group The technical effect analysis is as follows:

[0093] The second element group is close to the display 1 and has an optical power of Between 0 and 0.03, it is mainly responsible for aberration correction, which helps to improve the image quality of the eyepiece system. range, can reduce or eliminate various aberrations in the imaging process, thereby improving the clarity and accuracy of imaging.

[0094] Furthermore, by designing at least one lens element in the second element group with an Abbe number ≤ 40, chromatic aberration can be further corrected, improving color reproduction in images. Lenses with lower Abbe numbers have better control over chromatic aberration, helping to reduce the shift of light wavelengths during imaging, thereby improving color accuracy.

[0095] Through precise control and The overall performance of the eyepiece system can be optimized. For example, by The field of view and the amount of light entering the eyepiece system can be controlled. This allows the eyepiece system to achieve high-performance optical effects while maintaining its miniaturization.

[0096] By combining the design of a folded optical path with a straight optical path, and controlling the optical focal range of each component group, the present application can achieve miniaturization of the eyepiece system, expansion of the field of view, and display of high-performance optical effects. and The reasonable combination of the two also provides users with a clearer, more realistic and wider visual experience. By reducing aberrations and chromatic aberrations, improving the clarity and color reproduction of images, the eyepiece system of this application can meet the user's demand for high-quality imaging.

[0097] In some examples of this application, see Figure 1 and Figure 8 , the Abbe number of the lens closest to the first lens 7 in the second element group is ≤40.

[0098] Chromatic aberration is a common aberration in optical systems. It occurs when light of different wavelengths cannot focus on the same point due to differences in refractive power when passing through optical elements, which in turn adversely affects the color reproduction and clarity of the image.

[0099] To effectively address chromatic aberration, this application incorporates lenses with an Abbe number ≤40 in the second element group. These lenses, because they have varying refractive power for different wavelengths of light, are crucial for correcting chromatic aberration. By carefully adjusting the shape and position of these lenses, light of different colors can be precisely focused on the same point during imaging, significantly improving color reproduction and clarity.

[0100] The reduction or elimination of chromatic aberration directly optimizes the imaging quality, allowing users to observe more realistic and vivid colors and clearer images, meeting users' expectations for high-quality imaging.

[0101] Furthermore, the use of lenses with an Abbe number of 40 or less in the second element group is a key element in optimizing the system design. By precisely controlling the dispersion of these lenses, they can work synergistically with other lenses in the system, such as the first lens element 7, to enhance the overall performance of the eyepiece system. This design not only optimizes optical performance but also enables the eyepiece system to achieve high-performance while maintaining compactness, perfectly meeting the dual demands of compactness and high performance in modern optical equipment.

[0102] In some examples of this application, see Figure 1 and Figure 8 The second element group includes a second lens 6, a third lens 5, a fourth lens 4 and a fifth lens 3 arranged in sequence along the optical axis from the human eye side to the display side, wherein the Abbe number of the second lens 6 is ≤40.

[0103] In the example provided in the application, the second element group is designed with four lenses: a second lens 6, a third lens 5, a fourth lens 4, and a fifth lens 3. This design significantly enhances the aberration correction capability of the eyepiece system. Each lens can accurately refract and correct light, effectively improving the clarity and accuracy of imaging.

[0104] The introduction of a four-lens design allows for greater design flexibility in the eyepiece system. In practical applications, parameters such as the shape, curvature, thickness, and material of each lens can be flexibly adjusted to optimize optical performance and ensure the system can adapt to diverse application scenarios and requirements.

[0105] These four lenses in this example work together to further enhance the overall performance of the eyepiece system. Specifically, through optimized design, they effectively increase the field of view angle, increase the exit pupil diameter, and optimize the optical path layout, providing users with a wider and clearer field of view and an enhanced visual experience.

[0106] While a four-lens design offers numerous advantages, in certain applications, it's possible to simplify the design by reducing the number of lenses to two. However, it's important to note that reducing the number of lenses may compromise optical performance to some extent. Therefore, in actual design, a comprehensive balance of advantages and disadvantages is required. The number and configuration of lenses must be carefully selected based on specific needs and application scenarios to ensure the optimal balance between eyepiece system performance and cost-effectiveness.

[0107] The second lens element 6, with an Abbe number ≤ 40, exhibits significantly different refractive powers for light of different wavelengths, enabling it to more effectively adjust the refraction of light to reduce or eliminate chromatic aberration. Because the second lens element 6 is located close to the first lens element 7 (which is closer to the eye 01), the two elements work together to further optimize the refraction path of light. This allows light of different colors to more accurately converge on the same point after passing through the two lenses, significantly improving the efficiency of chromatic aberration correction.

[0108] The second lens 6 and the first lens 7 work together to create a synergistic effect. Their positions and functions in the optical path complement each other, jointly optimizing the refraction and focusing of light. This synergy not only improves the efficiency of chromatic aberration correction but also enhances the overall performance of the eyepiece system, such as optimizing parameters such as field of view and exit pupil diameter.

[0109] In summary, by providing the second lens 6 with an Abbe number ≤ 40 and close to the first lens 7 in the second element group, this design layout significantly improves the efficiency of chromatic aberration correction, optimizes imaging quality, maintains the compactness of the system design, produces a synergistic effect, and adapts to diverse needs.

[0110] In some examples of this application, see Figure 1 and Figure 8 The second lens 6 has a third surface 61 close to the display side, the third surface 61 is concave toward the display side, and satisfies the relationship: 0.03≤|SAG1| / D61≤0.1, wherein: SAG1 is the sag of the third surface 61, and D61 represents the effective optical aperture of the third surface 61.

[0111] In the example provided in this application, a specific surface design is performed on the third surface 61 of the second lens 6 close to the display side, and the shape characteristics of the surface are described and restricted in detail by introducing the proportional relationship between the sag height (SAG1) and the effective optical aperture (D61) 0.03≤|SAG1| / D61≤0.1.

[0112] By defining the ratio of the sag height SAG1 of the third surface 61 of the second lens 6 to the effective optical aperture D61, the concavo-convexity of the surface can be accurately described.

[0113] The sagittal height is the vertical distance from the vertex to any point on the bottom of the surface, and the effective optical aperture is the diameter of the area covered by the light rays that can participate in the imaging of the surface. This proportional relationship in this example of the present application provides a clear quantitative standard for the surface design of the second lens 6.

[0114] In the example provided herein, by adjusting the ratio of the sagittal height to the effective optical aperture, the refractive path of light passing through the second lens element 6 can be controlled, thereby reducing or eliminating aberrations. This surface design helps optimize imaging quality and improve image clarity and accuracy.

[0115] By adjusting the ratio of the sagittal height to the effective optical aperture, the surface shape of the second lens 6 can be adapted to specific needs, such as increasing the field of view angle, increasing the exit pupil diameter, etc. This flexibility enables the eyepiece system to meet diverse market needs.

[0116] In the examples provided herein, optimizing the surface design of the second lens 6 can improve the performance of the entire eyepiece system. For example, it can reduce light scattering and reflection losses, improving light utilization; optimize the light refraction path, reducing aberrations and distortion; and improve image clarity.

[0117] In some examples of the present application, the Abbe number of the fourth lens 4 is ≤40.

[0118] In the examples provided in this application, in addition to specifying that the Abbe number of the second lens 6 is ≤40, the Abbe number of the fourth lens 4 spaced apart from the second lens 6 may also be designed to be ≤40.

[0119] By including two lenses with an Abbe number ≤ 40 in the second element group (i.e., the second lens 6 and the fourth lens 4), the eyepiece system's ability to correct chromatic aberration can be further enhanced. Light of different wavelengths experiences more significant differences in refraction when passing through these two lenses, which helps reduce or eliminate chromatic aberration and improves color reproduction and clarity of the image.

[0120] Chromatic aberration is a significant factor affecting image quality. Reducing chromatic aberration allows different colors of light to be more accurately focused on the same point during imaging, thereby improving image clarity and accuracy. In the second element group, the synergistic effect of the fourth lens element 4 and the second lens element 6 helps optimize the image quality of the entire eyepiece system.

[0121] In optical system design, there's often a trade-off between performance and cost. By selecting appropriate lens materials and parameters, it's possible to maintain a certain level of image quality while controlling system manufacturing costs. In this application, by using two lenses with an Abbe number ≤ 40 to enhance chromatic aberration correction while maintaining the system's compactness and lightness, this approach helps strike a reasonable balance between performance and cost.

[0122] In some examples of this application, see Figure 1 and Figure 8The fourth lens 4 has a seventh surface 41 close to the display side, the seventh surface 41 is concave toward the display side, and satisfies the relationship: 0.05≤|SAG2| / D41≤0.1, wherein: SAG2 is the sag of the seventh surface 41, and D41 represents the effective optical aperture of the seventh surface 41.

[0123] See also Figure 1 and Figure 8 The design of the seventh surface 41 concave toward the display 1 precisely adjusts the refraction path of light passing through the fourth lens element 4 by controlling the ratio of the sag height SAG2 to the effective optical aperture D41 to 0.05 ≤ |SAG2| / D41 ≤ 0.1. This optimization helps ensure that light enters subsequent optical elements at a more accurate angle, thereby improving the imaging quality of the entire eyepiece system.

[0124] The specific surface design of the fourth lens element 4 (e.g., its surface concave toward the display) helps reduce aberrations in the eyepiece system, such as spherical aberration and coma. By precisely controlling the ratio of SAG2 to D41, the aberration correction capability of the fourth lens element 4 can be further optimized, resulting in clearer and more accurate imaging.

[0125] While ensuring optical performance, by optimizing the surface design of the fourth lens 4, the volume and weight of the lens can be reduced, thereby improving the compactness of the entire eyepiece system. This is particularly important for eyepiece systems that need to be integrated into small devices.

[0126] In some examples of this application, see Figure 1 and Figure 8 The effective optical aperture of each lens in the eyepiece system satisfies the following decreasing relationship: D1>D2>D3>D4>D5, wherein D1 is the effective optical aperture of the first lens 7, and D2 to D5 are the effective optical apertures of the second lens 6 to the fifth lens 3 respectively.

[0127] In the examples provided herein, by designing the effective optical apertures of the lenses to satisfy a decreasing relationship, it is possible to ensure that light is more effectively collected and focused when passing through the eyepiece system, thereby achieving an optical effect with a large field of view. This design helps to increase the imaging range of the eyepiece system.

[0128] The decreasing optical aperture design helps reduce light loss and scattering when passing through the lens, improving light transmission efficiency. This helps ensure that more light reaches the human eye, thereby improving image brightness and clarity.

[0129] The decreasing optical aperture design helps reduce aberrations and distortion, improving image quality. By precisely controlling the optical parameters and positional relationships of each lens, we ensure that light forms a clear and accurate image as it passes through the eyepiece system.

[0130] In addition, a reasonable optical aperture design helps improve the stability and reliability of the eyepiece system. By reducing the reflection and scattering loss of light when passing through the lens, the system's sensitivity to the external environment can be reduced, thereby maintaining stable performance under various usage conditions.

[0131] In summary, the design of the decreasing relationship of the effective optical aperture of each lens of the eyepiece system described in this example of the present application has significant technical effects, including achieving high-performance large-field optical effects, optimizing light transmission efficiency, reducing system volume and weight, improving imaging quality, and enhancing system stability and reliability.

[0132] In some examples of this application, see Figure 1 and Figure 8 The center thickness T3 of the third lens 5 and the total optical length TTL of the eyepiece system satisfy: 0.2≤T3 / TTL≤0.3.

[0133] By setting the ratio between the center thickness T3 of the third lens element 5 and the total optical length TTL of the entire eyepiece system, the overall structure of the eyepiece system can be optimized. This ratio helps ensure a reasonable layout of the lenses within the eyepiece system, avoiding space waste or structural incompactness caused by inappropriate lens thickness.

[0134] The third lens element 5, as a thicker lens, plays an important role in aberration correction in the eyepiece system of this application. By controlling the ratio of its central thickness to the total optical length (TTL), aberrations such as spherical aberration and coma can be more effectively corrected, thereby improving image clarity and accuracy.

[0135] By setting the T3 / TTL ratio, it is possible to control the manufacturing cost of the eyepiece system while maintaining a certain level of image quality. For example, a lens that is too thick may increase material costs and processing difficulty, while a lens that is too thin may not meet the required image quality.

[0136] Additionally, a thicker third lens 5 helps improve system stability. In an eyepiece system, the thickness and shape of the lenses significantly impact system stability. By setting a reasonable lens thickness ratio, fluctuations in optical performance due to factors such as temperature changes and mechanical vibration can be reduced.

[0137] In some examples of the present application, the center thickness T1 of the first lens 7 is 4 mm ≤ T1 ≤ 16 mm; the center thickness T2 of each lens in the second element group is 1 mm ≤ T2 ≤ 8 mm.

[0138] The first lens element 7, a key optical component closest to the eye, has a central thickness (T1) that significantly impacts image quality. An appropriate lens thickness can reduce aberrations such as spherical aberration and coma, thereby improving image clarity and accuracy. Specifically, a central thickness (T1) of the first lens element 7 ranging from 4mm to 16mm ensures image quality while balancing manufacturing processability and cost.

[0139] The range design of the center thickness T1 of the first lens 7 and the cooperation with other optical elements (such as subsequent lenses, reflective surfaces, etc.) help to achieve the optical effect of large field of view and large aperture angle, and meet the user's requirements for observation range and brightness.

[0140] Each lens in the second element group has a center thickness T2 (1mm ≤ T2 ≤ 8mm). The lenses in the second element group are located in the center of the eyepiece system or near the display side. The design of their center thickness T2 has a direct impact on the overall volume and weight of the system. In this example, the design range of 1mm to 8mm can reduce the volume and weight of the eyepiece system while maintaining optical performance, making it more portable and easier to integrate.

[0141] In addition, the appropriate thickness of the lenses in the second element group can ensure efficient transmission of light when passing through the lenses, reduce reflection and scattering losses, and thus improve the brightness and contrast of the image.

[0142] By rationally designing the center thickness of the first lens 7 and each lens in the second element group, it is possible to optimize the system's performance indicators such as volume, weight, stability, and flexibility while ensuring imaging quality.

[0143] In some examples of the present application, the circularly polarized light generating component is glued to the side of the spectroscopic element 710 away from the first lens 7; or, a lens is arranged between the circularly polarized light generating component and the spectroscopic element 710; the circularly polarized light generating component includes a second phase delay 712, a second polarizing element 713 and a third phase delay 714 which are stacked in sequence.

[0144] In the example provided in this application, there is a medium between the light splitting element 710 and the circularly polarized light generating component, but the medium is not air, and the medium is, for example, optical glue.

[0145] Of course, one or more lenses with a specific refractive index may also be arranged between the light splitting element 710 and the circularly polarized light generating component.

[0146] As media, optical adhesives and lenses themselves have certain optical properties, such as refractive index and transmittance. By selecting appropriate media materials and parameters, the imaging quality of the optical display system can be further optimized.

[0147] When optical glue is selected as the medium, the circularly polarized light generating assembly and the light splitting element 710 can be bonded together to form a stable optical whole. The optical glue is, for example, OCA glue or UV glue.

[0148] In some cases, lenses can also be used as the medium. This choice can achieve specific optical functions, such as focusing, etc. By rationally designing the shape and parameters of the lens, the performance of the optical system can be further optimized to meet specific application requirements.

[0149] The circularly polarized light generating assembly is mainly composed of a second phase retarder 712, a second polarizing element 713 and a third phase retarder 714 stacked in sequence, and is integrated with the light splitting element 710 on a side surface of the first lens 7 close to the second lens 6 (see Figure 1 The first surface 71 in the embodiment.

[0150] The circularly polarized light generation assembly provided in this application achieves precise phase delay and polarization state selection of light through the combination of a dual phase retarder and a polarizing element. This design not only improves the efficiency and quality of circularly polarized light generation, but also reduces the occurrence of ghosting, providing a clearer and purer visual experience for near-eye optical display systems.

[0151] Optionally, the circularly polarized light generating assembly further comprises a first anti-reflection film 711, see Figure 2 .

[0152] Anti-reflection coatings are thin films applied to the surface of optical components to reduce light reflection and increase light transmittance. They improve light transmission efficiency by reducing reflections caused by differences in refractive index when light travels from one medium to another.

[0153] In the circularly polarized light generating assembly provided in this application, see Figure 2 The first anti-reflection film 711 can effectively reduce light reflection losses on the surface of optical components (such as the first lens 7). The application of the first anti-reflection film 711 can significantly improve light transmittance, allowing more light to propagate along the designed path and ultimately enter the human eye 01, thereby improving image brightness and contrast.

[0154] Reducing reflected light not only improves light transmittance but also helps reduce glare and stray light. Glare and stray light can reduce image clarity and contrast, affecting the user's visual experience. The application of the first anti-reflective film 711 can effectively suppress the generation of these undesirable light rays, improving image purity and quality.

[0155] See also Figure 2The circularly polarized light generating assembly is, for example, a composite film structure including a first anti-reflection film 711, a second phase retarder 712, a second polarizing element 713, and a third phase retarder 714 stacked in sequence. The circularly polarized light generating assembly is located on a surface of the beam splitter 710 facing away from the first lens 7.

[0156] In some examples of the present application, the optical power of each lens in the eyepiece system is as follows:

[0157] The optical power of the first lens 7 for

[0158] The optical power of the second lens 6 for

[0159] The optical power of the third lens 5 for

[0160] The optical power of the fourth lens 4 for

[0161] The optical power of the fifth lens 3 for

[0162] The eyepiece system further includes a display 1 , which is arranged on a side of the second element group facing away from the first element group. A protective glass 2 is provided on the light-emitting surface of the display 1 , and the size of the display 1 is less than 0.5 inches.

[0163] In the example provided in this application, the optical power of the first lens 7 The range is This indicates that the first lens 7 has a small positive focal length, which helps to collect light from a large field of view and provide better imaging conditions. The range is It has negative optical power, which is used to correct some aberrations, such as spherical aberration, etc. The optical power of the third lens 5 is The range is The focal length of the fourth lens 4 is small and can be positive or negative, and can be fine-tuned according to specific design requirements to further optimize the imaging quality. The range is It also has a smaller optical power range for further correcting aberrations and adjusting imaging characteristics. The range is With positive optical power, it is one of the lenses with larger optical power in element group 2, mainly used for aberration correction and image quality improvement.

[0164] The display 1 is located on the side of the second element group facing away from the first element group and is the source of imaging. The size of the display 1 is less than 0.5 inches, which indicates that the eyepiece system design is suitable for small or compact devices.

[0165] The protective glass 2 is provided on the light-emitting surface of the display 1 to protect the display from external environmental influences, such as scratches, dust, etc., while not affecting the normal transmission of light.

[0166] According to the example provided in this application, by rationally designing the focal length range of each lens, aberrations can be effectively corrected, improving the clarity and accuracy of imaging. The coordination of the focal lengths of the lenses helps achieve the optical effects of a large field of view and a large aperture angle, meeting the user's requirements for viewing range and brightness. The size of the display 1 is less than 0.5 inches, indicating that the eyepiece system is suitable for small or portable devices. By optimizing the lens design and layout, the size and weight of the system can be reduced while ensuring imaging quality. In addition, the provision of the protective glass 2 can protect the display from the influence of the external environment, improving the stability and reliability of the system.

[0167] In some examples of the present application, the eyepiece system satisfies: 0.9≤TTL / f≤1.1; wherein TTL is the total optical length of the eyepiece system, and f is the total focal length of the eyepiece system.

[0168] The TTL / f ratio defines the balance between the compactness of the eyepiece system and imaging performance.

[0169] By defining the TTL / f ratio range, the size and weight of the eyepiece system can be minimized while maintaining imaging performance. This compact design is particularly important for applications requiring miniaturization or portability. In other words, a ratio range of 0.9 ≤ TTL / f ≤ 1.1 provides a balance between maintaining a compact eyepiece system and delivering excellent imaging performance. This balance helps meet the user's dual needs for image quality and portability.

[0170] In some examples of this application, see Figure 3 The first element group also includes a first polarizing element 722, which is stacked on a surface of the polarizing reflective element 723 facing away from the first phase retarder 724, and the first polarizing element 722, the polarizing reflective element 723 and the first phase retarder 724 form a composite film layer structure.

[0171] A polarizing element (i.e., a polarizing film) is an optical element that can filter out light of a specific polarization direction. In this application, the first polarizing element 722 can be used to further purify the light reflected by the polarized reflective element 723, ensuring that only light of a specific polarization direction can continue to propagate.

[0172] In the present application, the first phase retarder 724, the polarization reflecting element 723 and the first polarizing element 722 are integrated together to form a stacked structure, wherein the first phase retarder 724 converts the incident light into a specific polarization direction, the polarization reflecting element 723 selectively reflects the light in this polarization direction, and the first polarizing element 722 further purifies the reflected light, reduces light loss, and improves the overall light utilization efficiency.

[0173] Stray light and ghosting are common problems in near-eye optical systems, reducing image clarity and contrast. The circularly polarized light generation assembly in this example effectively reduces these issues by selectively reflecting and transmitting light with a specific polarization direction, thereby improving image purity and clarity.

[0174] In addition, the first phase retarder 724 , the polarization reflection element 723 and the first polarizing element 722 are integrated together to form a stacked structure, which can also simplify the optical design.

[0175] Optionally, the composite membrane structure, see Figure 3 , may further include a second anti-reflection film 721, wherein the second anti-reflection film 721, the first polarizing element 722, the polarized reflection element 723 and the first phase retarder 724 are stacked in sequence.

[0176] See also Figure 1 , Figure 1 Figure 1 The optical path diagram of the present application is shown. In this optical path diagram, light emitted by the display 1 is sequentially transmitted through the protective glass 2, the fifth lens 3, the fourth lens 4, the third lens 5, and the second lens 6. It passes through the circularly polarized light generating component on the first surface 71 of the first lens 7 to form circularly polarized light. It passes through the first phase retarder 724 on the second surface 72 of the first lens 7 to become linearly polarized light (S light). It is reflected by the polarizing reflective element 723, and then passes through the first phase retarder 724 again to become circularly polarized light. It is reflected by the beam splitter 710 on the first surface 71, and then passes through the first phase retarder 724 a third time to become linearly polarized light (P light). It then enters the human eye 01.

[0177] In the embodiments of the present application, the refractive index and dispersion coefficient of the materials of each lens are within a specific range. Specifically, the refractive index n of these lens materials satisfies 1.4 < n < 2.0, and the dispersion coefficient v satisfies 20 < v < 90.

[0178] The eyepiece system of the present application will be described below through Embodiment 1 and Embodiment 2 respectively.

[0179] Embodiment 1

[0180] See Figure 1 , the eyepiece system provided in this Embodiment 1 includes a first element group, a second element group and a display 1 arranged along the same optical axis, where:

[0181] The first element group is arranged close to the human eye 01, and includes a first lens 7. The first lens 7 has a first surface 71 close to the display side and a second surface 72 close to the human eye side. A beam splitting element 710 and a circularly polarized light generating component are provided on the first surface 71. The circularly polarized light generating component is adhesively provided on the side of the beam splitting element 710 away from the first lens 7, and there is no air gap between the two; a first phase retarder 724, a polarization reflection element 723 and a first polarizing element 722 are successively provided on the second surface 72. See Figure 3 , and the first phase retarder 724 is located on the optical path between the beam splitting element 710 and the polarization reflection element 723;

[0182] See Figure 2 , the circularly polarized light generating component includes a second phase retarder 712, a second polarizing element 713 and a third phase retarder 714 which are successively stacked;

[0183] The second element group includes a second lens 6, a third lens 5, a fourth lens 4 and a fifth lens 3 arranged in sequence from the human eye side to the display side along the optical axis. Among them, the Abbe numbers of the second lens 6 and the fourth lens 4 are both ≤ 40; the second lens 6 has a third surface 61 close to the display side, and the third surface 61 is concave toward the display side and satisfies the relationship: SAG1 / D61 is 0.035; the fourth lens 4 has a seventh surface 41 close to the display side, and the seventh surface 41 is concave toward the display side and satisfies the relationship: SAG2 / D41 is 0.09;

[0184] A protective glass 2 is provided on the light emitting surface of the display 1, and the size of the display 1 < 0.5 inches;

[0185] The eyepiece system satisfies: TTL / f is 0.98.

[0186] For the optical parameters of each lens in this Embodiment 1, please refer to Table 1 below.

[0187] Table 1

[0188]

[0189]

[0190] The optical power of each lens in this embodiment 1 is shown in Table 2 below.

[0191] Table 2

[0192] Each lens optical power First lens 7 0.004722803 Second lens 6 -0.013761887 Third lens 5 -0.001728505 Fourth lens 4 0.018661291 Fifth lens 3 0.018041767

[0193] The optical power and maximum effective optical aperture of the first element group and the second element group in this embodiment 1 are shown in Table 3 below.

[0194] Table 3

[0195]

[0196] According to Table 3, we can see that: About 0.25.

[0197] The eyepiece system provided in this embodiment 1 has optical performance as follows: Figures 4 to 7 As shown: Figure 4 is a point diagram diagram. Figure 5 is the MTF curve graph, Figure 6 It is the field curvature and distortion diagram, Figure 7 is the vertical axis chromatic aberration diagram. Figures 4 to 7 Perform analysis:

[0198] See also Figure 4 In the eyepiece system provided in this embodiment 1, the maximum value of the image point in the point array diagram is less than 6 μm.

[0199] See also Figure 5 The eyepiece system provided in this embodiment 1 has an MTF of >0.3 at 40lp / mm.

[0200] See also Figure 6 In the eyepiece system provided in this embodiment 1, the maximum distortion occurs in 1 field of view, and the absolute value is less than 2%.

[0201] See also Figure 7 The eyepiece system provided in this embodiment 1 has a maximum chromatic aberration value of less than 65 μm.

[0202] Example 2

[0203] See also Figure 8 The eyepiece system provided in this embodiment 1 includes a first element group, a second element group, and a display 1 arranged along the same optical axis, wherein:

[0204] The first element group is arranged close to the human eye 01 and includes a first lens 7. The first lens 7 has a first surface 71 close to the display side and a second surface 72 close to the human eye side. The first surface 71 is provided with a beam splitter 710 and a circularly polarized light generating component. The circularly polarized light generating component is glued to the side of the beam splitter 710 facing away from the first lens 7 with no air gap between them. The second surface 72 is provided with a first phase retarder 724, a polarized reflective element 723 and a first polarizing element 722 in sequence. Figure 3 , and the first phase retarder 724 is located on the optical path between the beam splitting element 710 and the polarized reflection element 723;

[0205] See also Figure 2 The circularly polarized light generating assembly includes a second phase retarder 712, a second polarizing element 713 and a third phase retarder 714 which are stacked in sequence;

[0206] The second lens group includes a second lens 6, a third lens 5, a fourth lens 4, and a fifth lens 3, arranged in sequence along the optical axis from the human eye side to the display side, wherein the Abbe numbers of the second lens 6 and the fourth lens 4 are both ≤40; the third surface 61 is concave toward the display side and satisfies the relationship: SAG1 / D61 is 0.052; the fourth lens 4 has a seventh surface 41 adjacent to the display side, the seventh surface 41 is concave toward the display side, and satisfies the relationship: SAG2 / D41 is 0.083;

[0207] A protective glass 2 is provided on the light-emitting surface of the display 1, and the size of the display 1 is less than 0.5 inches;

[0208] The eyepiece system satisfies: TTL / f is 1.02.

[0209] The optical parameters of each lens in this embodiment 2 are shown in Table 4 below.

[0210] Table 4

[0211]

[0212]

[0213] The optical power of each lens in this embodiment 2 is shown in Table 5 below.

[0214] Table 5

[0215]

[0216]

[0217] The maximum effective optical apertures of the first element group and the second element group in this embodiment 2 are shown in Table 6 below.

[0218] Table 6

[0219]

[0220] According to Table 6, we can see that: About 0.03.

[0221] The optical performance of the eyepiece system provided in this embodiment 2 is as follows: Figures 9 to 12 As shown: Figure 9 is a point diagram diagram. Figure 10 is the MTF curve graph, Figure 11 It is the field curvature and distortion diagram, Figure 12 This is a diagram of vertical chromatic aberration.

[0222] See also Figure 9 In the eyepiece system provided in this embodiment 2, the maximum value of the image point in the point array diagram is less than 5 μm.

[0223] See also Figure 10 The eyepiece system provided in this embodiment 2 has an MTF of >0.25 at 40lp / mm.

[0224] See also Figure 11 In the eyepiece system provided in this embodiment 2, the maximum distortion occurs in one field of view, and the absolute value is less than 2%.

[0225] See also Figure 12 , the eyepiece system provided in this embodiment 2 has a maximum chromatic aberration value of less than 65 μm.

[0226] According to another embodiment of the present application, an optical device is provided, comprising the eyepiece system and an objective lens as described above, wherein the objective lens is located on a display side of the eyepiece system.

[0227] The eyepiece system is responsible for guiding the light emitted by the display 1 to the human eye 01 and optimizing the image quality. The objective lens is located between the display 1 and the eyepiece and is used to further focus and correct the light emitted by the display 1 to improve the clarity and quality of the image.

[0228] The specific implementation of the optical device of the embodiment of the present application can refer to the various embodiments of the eyepiece system mentioned above, and therefore at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0229] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0230] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above examples may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An eyepiece system, characterized in that: The device comprises a first element group and a second element group arranged along the same optical axis, wherein: The first element group is arranged close to the human eye side and comprises a first lens (7), the first lens (7) having a first surface (71) close to the display side and a second surface (72) close to the human eye side, and a beam splitter (710) and a circularly polarized light generating component are provided on the first surface (71), the circularly polarized light generating component is located on the side of the beam splitter (710) facing away from the first lens (7), and there is no air gap between the two; a first phase retarder (724) and a polarized reflective element (723) are provided on the second surface (72), and the first phase retarder (724) is located on the optical path between the beam splitter (710) and the polarized reflective element (723); The second element group is arranged close to the display side and includes at least two lenses, and the Abbe number of at least one lens is ≤40; The eyepiece system satisfies the relationship: 0.01≤(D1 max ×φ1) / (D2 max ×φ2)≤0.3; wherein φ1 is the optical focal length of the first element group, φ2 is the optical focal length of the second element group, D1 is the maximum effective optical aperture of the first element group, and D2 is the maximum effective optical aperture of the second element group.

2. The eyepiece system according to claim 1, wherein: The optical power φ1 of the first element group satisfies: 0<φ1≤0.005; The optical power φ2 of the second element group satisfies: 0<φ2≤0.

03.

3. The eyepiece system according to claim 1, wherein: The Abbe number of the lens closest to the first lens (7) in the second element group is ≤40.

4. The eyepiece system according to any one of claims 1 to 3, characterized in that The second element group comprises a second lens (6), a third lens (5), a fourth lens (4) and a fifth lens (3) arranged in sequence along the optical axis from the human eye side to the display side, wherein the Abbe number of the second lens (6) is ≤40.

5. The eyepiece system according to claim 4, wherein: The second lens (6) has a third surface (61) close to the display side, the third surface (61) is concave toward the display side, and satisfies the relationship: 0.03≤|SAG1| / D61≤0.1, wherein: SAG1 is the sag of the third surface (61), and D61 represents the effective optical aperture of the third surface (61).

6. The eyepiece system according to claim 4, wherein: The Abbe number of the fourth lens (4) is ≤40.

7. The eyepiece system according to claim 6, wherein: The fourth lens (4) has a seventh surface (41) close to the display side, the seventh surface (41) is concave toward the display side, and satisfies the relationship: 0.05≤|SAG2| / D41≤0.1, wherein: SAG2 is the sag of the seventh surface (41), and D41 represents the effective optical aperture of the seventh surface (41).

8. The eyepiece system according to claim 4, wherein: The effective optical apertures of the lenses in the eyepiece system satisfy the following decreasing relationship: D1>D2>D3>D4>D5, wherein D1 is the effective optical aperture of the first lens (7), and D2 to D5 are the effective optical apertures of the second lens (6) to the fifth lens (3) in sequence.

9. The eyepiece system according to claim 4, wherein: The central thickness T3 of the third lens (5) and the total optical length TTL of the eyepiece system satisfy the following: 0.2≤T3 / TTL≤0.

3.

10. The eyepiece system according to claim 1, wherein: The center thickness T1 of the first lens (7) is 4 mm ≤ T1 ≤ 16 mm; The center thickness T2 of each lens in the second element group is 1 mm ≤ T2 ≤ 8 mm.

11. The eyepiece system according to claim 1, wherein: The circularly polarized light generating component is glued to the side of the light splitting element (710) away from the first lens (7); or, A lens is provided between the circularly polarized light generating component and the light splitting element (710); The circularly polarized light generating component comprises a second phase retarder (712), a second polarizing element (713) and a third phase retarder (714) which are stacked in sequence.

12. The eyepiece system according to claim 4, wherein: The optical power of each lens in the eyepiece system is as follows: The optical power φ11 of the first lens (7) is 0.001≤φ11≤0.007; The optical power φ21 of the second lens (6) is -0.02≤φ21≤-0.01; The optical power φ22 of the third lens (5) is -0.002≤φ22≤0.01; The optical power φ23 of the fourth lens (4) is -0.001≤φ23≤0.02; The optical power φ24 of the fifth lens (3) is 0.01≤φ24≤0.04; The eyepiece system further comprises a display (1) which is arranged on the side of the second element group facing away from the first element group. A protective glass (2) is arranged on the luminous surface of the display (1). The size of the display (1) is less than 0.5 inches.

13. The eyepiece system according to claim 12, wherein: The eyepiece system satisfies the following: 0.9≤TTL / f≤1.1; wherein TTL is the total optical length of the eyepiece system, and f is the total focal length of the eyepiece system.

14. The eyepiece system according to claim 13, wherein: The first element group further includes a first polarizing element (722), which is stacked on a surface of the polarizing reflective element (723) facing away from the first phase retarder (724), and the first polarizing element (722), the polarizing reflective element (723) and the first phase retarder (724) form a composite film layer structure.

15. An optical device, characterized in that: include: The eyepiece system according to any one of claims 1 to 14; and An objective lens is located on the display side of the eyepiece system.

Images