Eyepiece system and optical device

Abstract

Embodiments of the present application provide an eyepiece system and an optical device; wherein the eyepiece system comprises a first optical assembly and a second optical assembly arranged along the same optical axis; the first optical assembly is located on the eye side and is of a folded light path structure, and comprises at least two lenses, a first composite optical film material and a light splitting element; the first composite optical film material comprises a first phase retarder and a polarization reflection element arranged in a stack, and the first phase retarder is located between the light splitting element and the polarization reflection element; the second optical assembly is located on the display side and is of a straight light path structure, and comprises at least one transmission lens; the eyepiece satisfies the following relationship: 25≤(|D1*φ1|‑|D2*φ2|) / φ≤50; wherein D1 is the largest optical aperture in the first optical assembly, φ1 is the optical power of the first optical assembly, D2 is the largest optical aperture in the second optical assembly, φ2 is the optical power of the second optical assembly, and φ is the optical power of the entire eyepiece system.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of optical systems, and more particularly, to an eyepiece system and an optical device. BACKGROUND

[0002] In an optical device, an eyepiece system is a key component for observing a target. A conventional eyepiece system usually adopts a straight-through optical scheme, which can achieve certain optical effects, but has a complex structure and usually needs multiple lenses (more than 4 lenses) to achieve good imaging quality, resulting in a large volume of the entire optical system and a limited exit pupil diameter. In addition, the conventional eyepiece system also has certain limitations in aberration correction and optical path design, which is difficult to meet the demand for high imaging quality and miniaturization of modern optical devices.

[0003] In order to overcome the above problems, an optical scheme of folded optical path is proposed in the prior art to reduce the volume of the entire eyepiece system by reducing the number of lenses. However, for the eyepiece system, the existing folded optical path design still has deficiencies in optical power distribution, aberration correction, and optical aperture matching, etc., which is difficult to achieve the design goal of large exit pupil diameter while ensuring the imaging quality. SUMMARY

[0004] The purpose of the present application is to provide a new technical scheme of an eyepiece system and an optical device.

[0005] In a first aspect, embodiments of the present application provide an eyepiece system, which comprises a first optical assembly and a second optical assembly arranged along the same optical axis.

[0006] The first optical assembly is located on the objective side and has a folded optical path structure, comprising at least two lenses, a first composite optical film material, and a light splitting element, wherein the first composite optical film material comprises a first phase retarder and a polarization reflection element arranged in a stack, and the first phase retarder is located between the light splitting element and the polarization reflection element.

[0007] The second optical assembly is located on the display side and has a straight-through optical path structure, comprising at least one transmissive lens.

[0008] The eyepiece satisfies the following relationship:

[0009] 25≤(|D1*φ1|-|D2*φ2|) / φ≤50; wherein D1 is the largest optical aperture in the first optical assembly, φ1 is the optical power of the first optical assembly, D2 is the largest optical aperture in the second optical assembly, φ2 is the optical power of the second optical assembly, and φ is the optical power of the entire eyepiece system.

[0010] Optionally, the eyepiece satisfies the following relationship: 30≤(|D1*φ1|-|D2*φ2|) / φ≤46.

[0011] Optionally, the first optical assembly and the second optical assembly at least include four lenses arranged along the optical axis;

[0012] The maximum optical aperture D1 in the first optical assembly and the maximum optical aperture D2 in the second optical assembly satisfy: D1-D2≥10mm.

[0013] Optionally, the first optical assembly includes a third lens and a fourth lens arranged along the optical axis, wherein the third lens is located between the fourth lens and the second optical assembly;

[0014] The first composite optical film material is arranged on the fourth lens;

[0015] The light splitting element is arranged on the third lens.

[0016] Optionally, the first composite optical film material is arranged on a side surface of the fourth lens close to the third lens;

[0017] The light splitting element is arranged on a side surface of the third lens close to the second optical assembly.

[0018] Optionally, the second optical assembly includes a first lens and a second lens arranged along the optical axis, wherein:

[0019] The second lens is arranged close to the third lens;

[0020] The first lens is arranged away from the third lens;

[0021] The first lens and the second lens are both transmissive lenses.

[0022] Optionally, the first optical assembly includes a second lens, a third lens and a fourth lens arranged along the optical axis in sequence, wherein:

[0023] The fourth lens is close to the eye side;

[0024] The second lens is close to the second optical assembly;

[0025] The first composite optical film material is arranged on the fourth lens;

[0026] The light splitting element is arranged on the second lens.

[0027] Optionally, the first composite optical film material is arranged on a side surface of the fourth lens close to the third lens;

[0028] The spectral element is arranged on a side surface of the second lens close to the second optical assembly.

[0029] Optionally, the second optical assembly comprises a first lens arranged along the optical axis, the first lens is located on a side of the second lens away from the third lens, and the first lens is a transmitting lens.

[0030] Optionally, the eyepiece system further comprises a display located on the display side, the display is arranged on a side of the second optical assembly away from the first optical assembly along the optical axis.

[0031] A protective glass is arranged on a light-emitting surface of the display, and the thickness of the protective glass is greater than or equal to 0.5 mm.

[0032] Optionally, the eyepiece system further comprises a second composite optical film material arranged between the display and the first optical assembly, for converting light emitted by the display into circularly polarized light.

[0033] The second composite optical film material comprises a second phase retarder, a third phase retarder, and a second polarizing element arranged between the two phase retarders.

[0034] Optionally, the second composite optical film material is arranged on the light-emitting surface of the display.

[0035] Optionally, the one optical assembly comprises a second lens, a third lens and a fourth lens arranged along the optical axis in sequence, the second optical assembly comprises a first lens arranged along the optical axis, and the second composite optical film material is arranged on the first lens or the second lens.

[0036] Optionally, the first composite optical film material further comprises a first polarizing element, and the first polarizing element is arranged on a side surface of the polarizing reflection element away from the first phase retarder.

[0037] In a second aspect, an embodiment of the present application provides an optical device, the optical device comprising:

[0038] The eyepiece system as described in the first aspect; and

[0039] An objective lens, the objective lens is located on the display side of the eyepiece system.

[0040] The present application has the following beneficial effects:

[0041] The eyepiece system provided in this application, by introducing a folded optical path structure design on the eye side, effectively reduces the overall size, making the entire eyepiece system more compact and lightweight, facilitating integration and application in various near-eye optical devices, such as electronic aiming devices. This application also optimizes the power distribution and aperture matching of the two main optical components, namely the first and second optical components. This design not only increases the exit pupil diameter of the eyepiece system, ensuring a wider field of view for the user, but also significantly improves image quality, providing the user with a clear visual experience. Therefore, the eyepiece system provided in this application, through a series of novel designs, achieves a combination of large exit pupil diameter, high image quality, and miniaturized size.

[0042] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0043] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0044] Figure 1 This is one of the structural schematic diagrams of the eyepiece optical system provided in the embodiments of this application;

[0045] Figure 2 This is a schematic diagram of the structure of the first composite optical film material provided in the embodiments of this application;

[0046] Figure 3 This is a schematic diagram of the structure of the second composite optical film provided in the embodiments of this application;

[0047] Figure 4 for Figure 1 Dot array diagram of the eyepiece optical system in the image;

[0048] Figure 5 for Figure 1 MTF diagram of the eyepiece optical system in the image;

[0049] Figure 6 for Figure 1 Field curvature and optical distortion diagram of the eyepiece optical system in the image;

[0050] Figure 7 for Figure 1 The transverse chromatic aberration diagram of the eyepiece optical system in the image;

[0051] Figure 8 This is a second schematic diagram of the structure of the eyepiece optical system provided in the embodiments of this application;

[0052] Figure 9 forFigure 8 Dot array diagram of the eyepiece optical system in the image;

[0053] Figure 10 for Figure 8 MTF diagram of the eyepiece optical system in the image;

[0054] Figure 11 for Figure 8 Field curvature and optical distortion diagram of the eyepiece optical system in the image;

[0055] Figure 12 for Figure 8 The transverse chromatic aberration diagram of the eyepiece optical system in the image;

[0056] Figure 13 This is the third schematic diagram of the structure of the eyepiece optical system provided in the embodiments of this application;

[0057] Figure 14 for Figure 13 Dot array diagram of the eyepiece optical system in the image;

[0058] Figure 15 for Figure 13 MTF diagram of the eyepiece optical system in the image;

[0059] Figure 16 for Figure 13 Field curvature and optical distortion diagram of the eyepiece optical system in the image;

[0060] Figure 17 for Figure 13 The vertical chromatic aberration diagram of the eyepiece optical system in the image.

[0061] Explanation of reference numerals in the attached figures:

[0062] 1. Display; 2. First lens; 21. First surface; 22. Second surface; 3. Second lens; 31. Third surface; 32. Fourth surface; 4. Third lens; 41. Fifth surface; 42. Sixth surface; 5. Fourth lens; 51. Seventh surface; 52. Eighth surface; 6. Beam splitter; 7. First composite optical film; 70. First anti-reflective film; 71. First phase retarder; 72. Polarizing reflective element; 73. First polarizing element; 8. Second composite optical film; 80. Second anti-reflective film; 81. Second phase retarder; 82. Second polarizing element; 83. Third phase retarder. Detailed Implementation

[0063] Various exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application.

[0064] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application or its application and uses.

[0065] Techniques and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the specification where appropriate.

[0066] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of exemplary embodiments can have different values.

[0067] It should be noted that like reference numerals and letters refer to like items throughout the several views, and as a result, further discussion of such items is not necessary in the subsequent views.

[0068] The eyepiece system and optical device provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0069] According to one embodiment of the present application, an eyepiece system is provided, referring to Figure 1 and Figure 2 and Figure 8 and Figure 13 As shown, the eyepiece system includes a first optical assembly and a second optical assembly arranged along the same optical axis; the first optical assembly is located on the eye side and is of a folded light path structure, including at least two lenses, a first composite optical film 7 and a light splitting element 6, the first composite optical film 7 includes a first phase retarder 71 and a polarization reflection element 72 arranged in a stack, and the first phase retarder 71 is located between the light splitting element 6 and the polarization reflection element 72; the second optical assembly is located on the display side and is of a straight light path structure, including at least one transmissive lens; the eyepiece satisfies the following relationship: 25mm≤(|D1*φ1|-|D2*φ2|) / φ≤50mm; where D1 is the largest optical aperture in the first optical assembly, φ1 is the optical power of the first optical assembly, D2 is the largest optical aperture in the second optical assembly, φ2 is the optical power of the second optical assembly, and φ is the optical power of the entire eyepiece system.

[0070] The eyepiece system provided by the embodiments of the present application includes a first optical assembly and a second optical assembly arranged along the same optical axis, and the overall structure is simple. Among them, the second optical assembly is designed to be located on the display side (i.e. the side where the display 1 is located), which is a straight light path structure, responsible for guiding the light from the display 1 to the first optical assembly. The first optical assembly is located on the eye side (i.e. the side where the user's eye is located), which adopts a folded light path structure, responsible for receiving and processing the light transmitted through the second optical assembly, so that it is suitable for human eye observation.

[0071] In this application, the first optical component located on the eye side is designed to include at least two lenses that can be used to refract and / or focus light, enabling the light to propagate along a designed optical path, thereby facilitating the formation of a clear image.

[0072] The first optical component of the eyepiece system provided in this application embodiment (located on the eye side and employing a folded optical path structure) can be configured in two specific ways, as follows:

[0073] First implementation method (see...) Figure 1 ):

[0074] The first optical component, starting from the eye side, includes a fourth lens 5 and a third lens 4 in sequence.

[0075] The second implementation method (see...) Figure 2 and Figure 3 ):

[0076] The first optical component, starting from the eye side, includes a fourth lens 5, a third lens 4, and a second lens 3 in sequence.

[0077] The first optical component not only includes multiple lenses (such as the fourth lens 5, the third lens 4, etc., the specific number and arrangement order of which depend on the embodiment), but also integrates multiple key optical films. Specifically, the first optical component also includes at least two important parts: the first composite optical film 7 and the beam splitter 6.

[0078] The first composite optical film 7 is mainly composed of two key optical elements stacked together: a first phase retarder 71 and a polarization reflection element 72. This stacked structure allows light to undergo phase retardation and polarization reflection sequentially when passing through the first optical component, thereby achieving specific optical functions.

[0079] The beam splitter 6 is located on the side of the first phase delayer 71 away from the polarization reflection element 72, and is used to split the light into different paths. It works in conjunction with the first composite optical film 7 to achieve the light path folding effect.

[0080] The first phase delayer 71 is used to delay the phase of light, thereby changing the polarization state of the light. This is a key component for realizing specific optical functions (such as circular polarization conversion).

[0081] The first phase delayer 71 is, for example, a quarter-wave plate.

[0082] The polarization-reflecting element 72 is capable of reflecting or transmitting light according to its polarization state. In the eyepiece system provided in this application embodiment, it is used to reflect light with a specific polarization state back into the optical path, while allowing light with other polarization states to pass through.

[0083] The polarization reflective element 72 is, for example, a polarization reflective film.

[0084] The beam splitter 6 can transmit a portion of the light while reflecting a portion of the light, thus splitting the light into different paths or changing the direction of light propagation. In the eyepiece system provided in this embodiment, it is used in conjunction with the first composite optical film to achieve optical path folding.

[0085] The beam splitter 6 is, for example, a semi-transparent and semi-reflective film.

[0086] In this application, the second optical component located on the display side includes at least one transmissive lens. The lens in the second optical component is used to transmit light from the display 1 and guide the light into the first optical component. These lenses, like the lenses in the first optical component, may all have aspherical surfaces to correct aberrations.

[0087] The eyepiece system provided in this application embodiment has two specific implementation methods for its second optical component (located on the display side, adopting a direct-transmission optical path structure), as follows:

[0088] First implementation method (see...) Figure 1 ):

[0089] The second optical component, starting from the display side, includes a first lens 2 and a second lens 3 in sequence.

[0090] The second implementation method (see...) Figure 2 and Figure 3 ):

[0091] The second optical component includes only the first lens 2.

[0092] The eyepiece system provided in this application must satisfy the following relationship: 25≤(|D1*φ1|-|D2*φ2|) / φ≤50. This is a key optical parameter relationship in this application, used to ensure a reasonable match between the first optical component and the second optical component in terms of optical power and optical aperture.

[0093] Specifically, the first optical component located near the eye has a relatively large lens aperture and high optical power. This design is primarily to effectively correct aperture aberrations in the eyepiece system, thereby achieving the goal of a large exit pupil diameter. The eyepiece system of this application embodiment can achieve an exit pupil diameter of 20mm or more (i.e., an exit pupil diameter ≥ 20mm), which is more than double the exit pupil diameter of existing eyepiece systems.

[0094] The second optical component, located on the display side, is responsible for generating higher-order aberrations to balance them, thereby improving overall image quality. By combining the carefully designed second optical component, the eyepiece system of this application can further optimize its optical performance while maintaining high imaging quality.

[0095] It should be noted that the large exit pupil diameter allows users to obtain a wider field of view and a more comfortable observation experience when using the eyepiece system.

[0096] Furthermore, the parameters in the above formula limit the differences in optical power and optical aperture between the two optical components, helping to reduce aberrations and distortions. This contributes to improving the imaging quality of the eyepiece system, resulting in a clearer observed image.

[0097] In summary, satisfying the above relationship is key to optimizing the overall performance of the eyepiece system. It not only helps achieve a large exit pupil diameter and high image quality, but also ensures that the eyepiece system maintains a compact design while possessing a large field of view and good image quality.

[0098] If the parameters of the eyepiece system do not satisfy the above relationship, a series of problems may arise:

[0099] (1) Decreased exit pupil diameter:

[0100] If the above relationship is not satisfied, the optical power and optical aperture between the first and second optical components may not be effectively matched. This could result in a reduced exit pupil diameter, affecting the user's field of vision and observation experience.

[0101] (2) Decreased image quality:

[0102] Excessive parameter differences between two optical components can lead to increased aberrations and distortions. This degrades the imaging quality of the eyepiece system, resulting in a blurry and unclear image.

[0103] (3) The overall system volume increases:

[0104] To compensate for the problems caused by the mismatch in optical parameters, it is necessary to increase the number or size of optical components. This would lead to an increase in the size of the eyepiece system, which is inconsistent with the goal of miniaturization.

[0105] In other words, the eyepiece system provided in this application achieves an optimized balance between a large exit pupil diameter, high imaging quality, and system compactness by satisfying a specific relation. If the relation does not meet the requirements, it may lead to problems such as a reduced exit pupil diameter, decreased imaging quality, and increased system size.

[0106] Furthermore, the eyepiece system provided in the embodiments of this application satisfies: 30≤(|D1*φ1|-|D2*φ2|) / φ≤46.

[0107] The eyepiece system provided in this application achieves a more optimized match between the optical power and optical aperture of the two optical components by satisfying a more precise relationship of 30≤(|D1*φ1|-|D2*φ2|) / φ≤46, thereby improving the exit pupil diameter, field of view and imaging quality, while maintaining the compactness of the system.

[0108] The eyepiece system provided according to the embodiments of this application achieves the following technical effects:

[0109] (1) Balancing large exit pupil diameter with high image quality:

[0110] The eyepiece system achieves a large exit pupil diameter (≥20mm) through a reasonable combination of folded and direct optical paths, and optimizes the distribution of optical power and the matching of optical aperture. Specifically, the first optical component adopts a folded optical path structure, which can effectively reduce the number of lenses, and achieves the design goal of large exit pupil diameter (≥20mm) through reasonable distribution of optical power.

[0111] The eyepiece system must satisfy the following relationship: 25≤(|D1*φ1|-|D2*φ2|) / φ≤50.

[0112] The eyepiece system can further satisfy: 30≤(|D1*φ1|-|D2*φ2|) / φ≤46.

[0113] The two relationships described above ensure that while increasing the exit pupil diameter, the aberrations of the eyepiece system can be effectively corrected, guaranteeing image quality. Through this design, the entire eyepiece system can maintain high image sharpness and low distortion even with a large exit pupil diameter.

[0114] (2) Miniaturization and lightweight design:

[0115] In this application, the first optical component adopts a folded optical path structure, which significantly reduces the system's size and weight by reducing the number of lenses and optimizing the optical path design. Compared with traditional direct-view optical solutions, the eyepiece system of this invention achieves a more compact structural design while ensuring optical performance, making it suitable for applications with high requirements for size and weight, such as electronic aiming devices.

[0116] (3) Improved image quality:

[0117] The power allocation and aperture matching design of the first and second optical components effectively corrects the system's aperture aberrations and higher-order aberrations. Through reasonable power allocation, the system can maintain low transverse chromatic aberration and distortion while increasing the exit pupil diameter, ensuring image quality.

[0118] For example, see Figures 4 to 7 , Figures 9 to 12 , Figures 4 to 17 The eyepiece system has a vertical chromatic aberration of less than 20 μm, an absolute distortion of less than 6%, and an MTF (modulation transfer function) greater than 0.1 at 12 lp / mm. These characteristics indicate that the eyepiece system has high imaging sharpness and low aberrations.

[0119] The eyepiece system of this application achieves the design goals of large exit pupil diameter, high imaging quality, and miniaturization by rationally combining folded and direct-transmission optical paths and optimizing optical power distribution and optical aperture matching. Through the cooperation of the first composite optical film 7 and the beam splitter 6, the eyepiece system can effectively control the polarization state of light, reduce stray light interference, and improve imaging contrast and clarity. Furthermore, the optical aberrations of the eyepiece system are corrected, with transverse chromatic aberration and distortion controlled at low levels, making it suitable for applications with high optical performance requirements, such as electronic aiming equipment.

[0120] Regarding the large exit pupil diameter, it should be noted that the eyepiece system provided in this application embodiment has an exit pupil diameter of 20mm or more, which is more than double that of existing optical solutions.

[0121] In some examples of this application, the first optical component and the second optical component include at least four lenses arranged along the optical axis; the largest optical aperture D1 in the first optical component and the largest optical aperture D2 in the second optical component satisfy the following condition: D1-D2≥10mm.

[0122] The eyepiece system proposed in this application employs a compact optical structure design, achieving the required optical functions with only four lenses. This design significantly reduces the number of lenses, achieving a marked optimization in lens usage compared to traditional eyepiece systems (which typically require more than four lenses). This simplification not only reduces manufacturing costs but also improves the overall performance and reliability of the system.

[0123] In this application, the first optical component is located on the eye side. This first optical component is mainly used to correct the aperture aberration of the eyepiece system and achieve a large exit pupil diameter. It may contain 2 to 3 lenses, the optical parameters of which (such as radius, thickness, material, etc.) are carefully designed to ensure that light can form a high-quality image after passing through the component.

[0124] In this application, the second optical component is located on the display side. This second optical component is used to generate higher-order aberrations for balancing, thereby further improving image quality. It may include one or two lenses, which work in conjunction with the lenses in the first optical component to achieve the overall optical performance of the eyepiece system.

[0125] In this example of the application, the largest optical aperture D1 in the first optical component and the largest optical aperture D2 in the second optical component satisfy the following relationship: D1 - D2 ≥ 10 mm. This relationship ensures that the first optical component has a sufficiently large optical aperture to receive light, and achieves a large exit pupil diameter and high image quality through optimized lens design. Meanwhile, the second optical component has a relatively small optical aperture, but through its synergistic effect with the first optical component, it can still achieve high-quality imaging.

[0126] According to the example in this application, where D1-D2≥10mm, the following technical effects can be achieved:

[0127] (1) Achieving a large exit pupil diameter:

[0128] By satisfying the relationship D1-D2≥10mm, the optical aperture of the first optical component is significantly larger than that of the second optical component. This design effectively increases the exit pupil diameter of the eyepiece system, allowing users to obtain a wider field of view and a more comfortable observation experience when using the eyepiece system.

[0129] Specifically, the first optical component employs a folded optical path structure. Through reasonable allocation of optical power and matching of optical aperture, it ensures that the imaging quality of the eyepiece system is not affected while increasing the exit pupil diameter. The large exit pupil diameter (≥20mm) design is particularly suitable for applications requiring a wide field of view and high comfort, such as electronic aiming devices.

[0130] (2) Optimize image quality:

[0131] The difference in optical aperture design between the first and second optical components can correct aperture aberrations and higher-order aberrations of the eyepiece system. By rationally allocating optical power and optical aperture, the eyepiece system can maintain low transverse chromatic aberration and distortion while increasing the exit pupil diameter, thus ensuring image quality.

[0132] The first optical component is primarily responsible for correcting the aperture aberration of the eyepiece system, while the second optical component balances it by generating higher-order aberrations. This division of labor allows the eyepiece system to maintain high imaging sharpness while increasing the exit pupil diameter. Specifically, the transverse chromatic aberration of the entire eyepiece system is less than 20 μm, the absolute value of distortion is less than 6%, and the MTF (modulation transfer function) is greater than 0.1 at 12 lp / mm.

[0133] (3) Compact optical structure design:

[0134] Despite the large optical aperture of the first optical component, the eyepiece system of this application maintains a small size and weight through a folded optical path design and reasonable power distribution. Compared with traditional direct-view optical solutions, the eyepiece system of this application achieves a more compact optical structure design while ensuring optical performance.

[0135] Furthermore, by setting up four lenses and rationally allocating the optical aperture, the eyepiece system can optimize the optical path design and improve optical efficiency. The coordinated design of the first and second optical components can effectively reduce stray light interference and improve the system's imaging contrast and clarity.

[0136] See some examples in this application. Figure 1 The first optical component includes a third lens 4 and a fourth lens 5 disposed along the optical axis, wherein the third lens 4 is located between the fourth lens 5 and the second optical component; the first composite optical film 7 is disposed on the fourth lens 5; and the beam splitter 6 is disposed on the third lens 4.

[0137] By arranging the third lens 4 and the fourth lens 5 along the optical axis of the eyepiece system, and combining them with the first composite optical film 7 and the beam splitter 6, the first optical assembly is located on the eye side of the eyepiece system, achieving a highly efficient folded optical path design. This design effectively reduces the optical path length, thereby reducing the size of the eyepiece system while maintaining high optical performance.

[0138] Specifically, the arrangement of the third lens 4 and the fourth lens 5, along with the optical film, allows light to be reflected and transmitted multiple times within the eyepiece system, thus achieving a longer optical path within a limited space. This folded optical path design is particularly suitable for applications with stringent requirements on size and weight.

[0139] See also in this application. Figure 1 and Figure 2The first composite optical film 7 includes a first phase retarder 71 and a polarization reflective element 72 stacked together, with the first phase retarder 71 located between the beam splitter 6 and the polarization reflective element 72. This design can effectively control the polarization state of light, reduce stray light interference, and improve the imaging contrast and clarity of the system.

[0140] Specifically, when light passes through the third lens 4 and the fourth lens 5, its polarization state is precisely controlled, thereby reducing the generation of stray light, which helps to improve image quality.

[0141] In this example of the application, the arrangement of the third lens 4 and the fourth lens 5, as well as the arrangement of the first composite optical film 7 and the beam splitter 6, can be used to effectively correct the optical aberrations of the eyepiece system, especially aperture aberrations and higher-order aberrations.

[0142] See some examples in this application. Figure 1 and Figure 2 The first composite optical film 7 is disposed on the side surface of the fourth lens 5 near the third lens 4; the beam splitting element 6 is disposed on the side surface of the third lens 4 near the second optical component.

[0143] The first composite optical film 7 is positioned on the side of the fourth lens 5 closest to the third lens 4, meaning that light from the display side immediately encounters the composite optical film after passing through the third lens 4. This layout helps maximize the film's light control effect, such as reducing reflection, increasing transmittance, or achieving specific polarization control. The beam splitter 6 is located on the side of the third lens 4 closest to the second optical component, allowing light to be directly processed by the beam splitter 6 after initial focusing and aberration correction by the third lens 4.

[0144] By placing the first composite optical film 7 and the beam splitter 6 at specific positions on the fourth lens 5 and the third lens 4, they can work together to optimize light propagation and imaging quality.

[0145] For some examples in this application, please continue to see Figure 1 The second optical component includes a first lens 2 and a second lens 3 arranged along the optical axis, wherein: the second lens 3 is arranged close to the third lens 4; the first lens 2 is arranged away from the third lens 4; and both the first lens 2 and the second lens 3 are transmission lenses.

[0146] See some examples in this application. Figure 1The first optical component includes a third lens 4 and a fourth lens 5, and is combined with a first composite optical film 7 and a beam splitter 6. This optical architecture design forms a close working relationship with the second optical component (including the first lens 2 and the second lens 3) in this example of the application, and together optimizes the propagation of light and the imaging quality.

[0147] In this example of the application, it is worth noting that, see [link to example]. Figure 1 The second optical component located on the display side uses two lenses, namely the first lens 2 and the second lens 3, to transmit light from the display side. This design has certain advantages in adjusting the optical power compared to using only one lens.

[0148] Using two lenses instead of one allows for greater flexibility in adjusting the optical power of the second optical component. By changing the radius of curvature, refractive index of the materials, or the distance between the two lenses, the focal length of the second optical component can be adjusted over a wider range to accommodate different display needs and user visual characteristics. This flexibility is crucial for achieving high-quality near-eye displays.

[0149] Using two lenses allows for more effective reduction of aberrations, such as spherical aberration, chromatic aberration, and astigmatism, by carefully designing their parameters (e.g., curvature, thickness, materials). This helps improve image sharpness and contrast, providing users with a superior visual experience.

[0150] The combined use of two lenses can also enhance the optical components' ability to control light. By rationally designing the surface shape and material properties of the lenses, the propagation direction and polarization state of light can be better controlled, enabling more complex optical functions such as polarization control and beam splitting.

[0151] See some examples in this application. Figure 8 and Figure 13 The first optical component includes a second lens 3, a third lens 4, and a fourth lens 5 arranged sequentially along the optical axis, wherein: the fourth lens 5 is close to the eye side; the second lens 3 is close to the second optical component; the first composite optical film 7 is disposed on the fourth lens 5; and the beam splitter 6 is disposed on the second lens 3.

[0152] See Figure 8 and Figure 13 The first optical component includes a second lens 3, a third lens 4, and a fourth lens 5 arranged sequentially along the optical axis. Figure 1 Unlike the first optical component shown, this design extends the first optical component to include three lenses. Specifically:

[0153] The fourth lens, 5, is located near the eye (i.e., the side closest to the user's eye). It is mainly responsible for guiding the light that has been corrected and regulated by the previous lenses to the human eye, ensuring the clarity and comfort of the image.

[0154] Second lens 3: Located near the second optical component (i.e., the component containing the first lens 2), it serves as a preliminary correction element after light enters the first optical component, and works in conjunction with subsequent lenses to reduce aberrations.

[0155] The third lens 4 is located between the second lens 3 and the fourth lens 5, and further corrects and controls the light to improve image quality.

[0156] Furthermore, the first composite optical film 7 is disposed on the fourth lens 5 for specific control of light, such as reducing reflection, increasing transmittance, or achieving specific polarization control. The beam splitter 6 is disposed on the second lens 3 for splitting light into different paths.

[0157] By adding lenses to the first optical component, it is possible to more precisely control light, further reducing aberrations and improving image clarity and contrast. This helps to enhance the user's visual experience when viewing optical devices.

[0158] In some examples of this application, the first composite optical film 7 is disposed on the side surface of the fourth lens 5 near the third lens 4; the beam splitter 6 is disposed on the side surface of the second lens 3 near the second optical component.

[0159] In this example of the application, this particular assembly method is designed to simplify the assembly process and improve the overall performance of the system. Specifically, the first composite optical film 7 is directly disposed on the surface of the fourth lens 5, and the beam splitter 6 is disposed on one side surface of the second lens 3, rather than being mounted as separate components, thus simplifying the assembly process. This integrated design reduces additional assembly steps and potential assembly errors, thereby improving production efficiency.

[0160] See some examples in this application. Figure 8 and Figure 13 The second optical component includes a first lens 2 disposed along the optical axis. The first lens 2 is located on the side of the second lens 3 opposite to the third lens 4, and the first lens 2 is a transmission lens.

[0161] See Figure 8 and Figure 13The first optical component employs three lenses—the second lens 3, the third lens 4, and the fourth lens 5—focusing on light control and improved image quality. Building upon this, the second optical component uses only one lens—the first lens 2—emphasizing light transmission and system compactness. The combination of these two components optimizes overall performance.

[0162] By using different numbers of lenses in different optical components, it is possible to control costs while ensuring performance, thus achieving a balance between performance and cost.

[0163] See some examples in this application. Figure 1 , Figure 8 and Figure 13 The eyepiece system further includes a display 1 located on the display side, the display 1 being disposed along the optical axis on the side of the second optical component away from the first optical component; a protective glass is disposed on the light-emitting surface of the display 1, the thickness of the protective glass being ≥0.5mm.

[0164] The eyepiece system provided in this application embodiment can be applied to electronic aiming equipment, and the display 1 is used to display the image.

[0165] In this application, the size of the display 1 is, for example, less than 1 inch.

[0166] In this application, a protective glass is provided on the light-emitting surface of the display 1. The protective glass directly covers the light-emitting surface of the display 1, which can effectively prevent dust, scratches or other physical factors from directly damaging the light-emitting surface. This helps maintain the clarity of the display and extend its service life.

[0167] Protective glass of a certain thickness (≥0.5mm) can provide a certain level of impact resistance, reducing the risk of monitor damage caused by accidental collisions or drops.

[0168] The protective glass effectively isolates the light-emitting surface of the display 1 from direct contact with the external environment, reducing the impact of surface dirt on the imaging quality of the eyepiece system. This is especially important for applications requiring high definition and high contrast.

[0169] The protective glass not only serves as a protective layer, but also as a fixed support for the light-emitting surface of the display, enhancing the stability and reliability of the entire optical system.

[0170] In harsh environments, such as high temperature, humidity, or dust, protective glass can effectively isolate these adverse factors from the display and ensure the normal operation of the optical system.

[0171] Furthermore, the protective glass simplifies the maintenance process. When the monitor surface needs cleaning, simply wipe the protective glass without directly contacting the light-emitting surface of the monitor, reducing maintenance costs and risks.

[0172] See some examples in this application. Figure 1 The eyepiece system further includes a second composite optical film 8, which is disposed between the display 1 and the first optical component, for converting the light emitted from the display 1 into circularly polarized light; see also Figure 3 The second composite optical film 8 includes a second phase delayer 81, a third phase delayer 83, and a second polarizing element 82 disposed between the two phase delayers.

[0173] Compared to linearly polarized light or natural light, circularly polarized light reduces reflection and scattering when passing through an optical system, thereby improving the contrast and sharpness of the image.

[0174] The eyepiece system provided in this application may also incorporate a second composite optical film 8, which can convert the light emitted from the display 1 into circularly polarized light, thereby improving the imaging quality of the entire eyepiece system.

[0175] In optical systems, light can be reflected and scattered at multiple surfaces, creating glare and ghosting. Circularly polarized light reduces these reflections and scattering, effectively eliminating glare and ghosting and improving the visual experience. Light passing through an optical system can also be affected by ambient light (such as sunlight and artificial light). Circularly polarized light reduces this interference, allowing the system to maintain stable imaging performance under various environmental conditions.

[0176] In this application, the light emitted from the display 1 is converted into circularly polarized light by the second composite optical film 8, which can make more effective use of light, reduce the loss of light during the propagation process, and improve the overall efficiency of the system.

[0177] The second phase delayer 81 and the third phase delayer 83 are both quarter-wave plates. The second polarizing element 82 is a polarizer.

[0178] Optionally, see Figure 3 The second composite optical film 8 may further include a second anti-reflective film 80, which is stacked on the side of the second phase delayer 81 away from the second polarizing element 82.

[0179] In some examples of this application, the second composite optical film 8 is disposed on the light-emitting surface of the display 1.

[0180] In this example of the application, the second composite optical film 8 is closest to the light source.

[0181] By directly placing the second composite optical film 8 on the light-emitting surface of the display 1, it is ensured that the light is immediately converted into circularly polarized light after leaving the display. This arrangement minimizes any loss or interference of light before conversion to circularly polarized light. By reducing light loss during the conversion process, the optical efficiency of the entire eyepiece system can be improved, allowing more light to reach the user's eye and enhancing image brightness and contrast.

[0182] In addition, the second composite optical film material 8 can also serve as a protective film on the light-emitting surface of the display 1 to prevent physical damage such as dust and scratches.

[0183] In some examples of this application, the optical component includes a second lens 3, a third lens 4 and a fourth lens 5 arranged sequentially along the optical axis, the second optical component includes a first lens 2 arranged along the optical axis, and the second composite optical film 8 is disposed on the first lens 2 or the second lens 3.

[0184] In this example of the application, the second composite optical film 8 is disposed on the first lens 2 or the second lens 3, providing greater flexibility. The appropriate placement position can be selected according to the specific requirements of the eyepiece system (such as light path, lens material, system size, etc.).

[0185] By applying a second composite optical film 8 to different lenses, the light path and image quality can be further optimized. For example, in some designs, applying the film to the first lens may help to better control the angle and polarization state of the incident light, thereby improving the overall performance of the system.

[0186] For example, see Figure 1 The second composite optical film 8 can be disposed on the surface of the second lens 3 near the third lens 4, that is, disposed on... Figure 1 On the fourth surface 32 shown in the figure.

[0187] In other examples, the position of the second composite optical film 8 can be adjusted as needed.

[0188] See some examples in this application. Figure 2 The first composite optical film 7 further includes a first polarizing element 73, which is disposed on the side surface of the polarizing reflective element 72 away from the first phase delayer 71.

[0189] The synergistic effect of the first polarizing element 73 and the polarizing reflective element 72 allows for precise control of the propagation direction and polarization state of light. This helps optimize the light path, reduce scattering and loss of light within the system, and improve optical efficiency. Furthermore, by precisely controlling the polarization state and propagation direction of light, stray light interference can be reduced, improving image sharpness.

[0190] Integrating the first polarizing element 73 and the polarizing reflective element 72 into the first composite optical film 7 simplifies system design. This integrated design not only reduces the number of individual optical components but also lowers the system's assembly complexity and manufacturing cost.

[0191] Optionally, the first composite optical film 7 may further include a first anti-reflection film 70, which is disposed on the side of the first phase retarder 71 opposite to the polarization reflection element 72.

[0192] According to another embodiment of this application, an optical device is provided, the optical device including an eyepiece system and an objective lens as described above, the objective lens being located on the display side of the eyepiece system.

[0193] The eyepiece system is responsible for guiding the light emitted from the display 1 to the human eye and optimizing the image quality. The objective lens is located between the display 1 and the eyepiece (including a first optical component and a second optical component) and is used to further focus and correct the light emitted from the display 1 to improve the clarity and quality of the image.

[0194] The eyepiece system of this application will be described below through Examples 1 and 3.

[0195] Example 1

[0196] The eyepiece system provided in this embodiment 1 is described in [reference]. Figure 1 It includes a display, a first optical component, and a second optical component arranged sequentially along the same optical axis;

[0197] The first optical component is located on the eye side and has a folded optical path structure. It includes a third lens 4, a fourth lens 5, a first composite optical film 7, and a beam splitter 6. (See [link]) Figure 2 The first composite optical film 7 includes a first anti-reflection film 70, a first phase retarder 71, a polarization reflection element 72 and a first polarizing element 73 stacked in sequence. The beam splitting element 6 is disposed on the fifth surface 41 of the third lens 4, and the first composite optical film 7 is disposed on the seventh surface 51 of the fourth lens 5.

[0198] The second optical component is located on the display side and has a direct light path structure, which includes a first lens 2 and a second lens 3;

[0199] The display 1 is disposed along the optical axis on the side of the second optical component opposite to the first optical component, and a protective glass is disposed on the light-emitting surface of the display 1, the thickness of the protective glass being ≥0.5mm;

[0200] The eyepiece system also includes a second composite optical film 8, which is disposed on the fourth surface 32 of the second lens 3, for converting the light emitted from the display 1 into circularly polarized light;

[0201] See Figure 3 The second composite optical film 8 includes a second anti-reflective film 80, a second phase delayer 81, a third phase delayer 83, and a second polarizing element 82 disposed between the two phase delayers, which are stacked in sequence.

[0202] The specific parameters of the eyepiece optical system provided in this embodiment 1 are shown in Table 1 below, which includes the radius of curvature, thickness, material, and radius of the lens.

[0203] Table 1

[0204]

[0205]

[0206] In addition, Table 4 following Example 3 shows other parameters involved in Example 1 (such as D1, D2, φ1, φ2 and φ), please refer to Table 4 for details.

[0207] The eyepiece system provided in this embodiment 1 has the following optical performance: Figures 4 to 7 As shown: Figure 4 This is a schematic diagram of a dot-matrix diagram. Figure 5 It is an MTF curve. Figure 6 This is a diagram of the curvature and distortion. Figure 6 It is a vertical axis color difference diagram.

[0208] A dot pattern refers to a diffuse pattern formed by numerous rays emanating from a single point. Due to aberrations, these rays intersect the image plane at a point other than a single point, creating a scattered pattern over a certain area. This pattern is used to evaluate the imaging quality of the projection optical module. See also... Figure 4 The eyepiece system provided in this embodiment 1 has a maximum image size of less than 33μm in the dot matrix diagram.

[0209] The MTF curve is a modulation transfer function graph, which characterizes the imaging sharpness of the optical module through the contrast of black and white line pairs. See also Figure 5 The eyepiece system provided in this embodiment 1 has an MTF > 0.1 at 12 lp / mm.

[0210] See Figure 6The eyepiece system provided in this embodiment has the maximum distortion occurring in the field of view, with an absolute value of less than 6%.

[0211] Transverse chromatic aberration, also known as magnification chromatic aberration, mainly refers to the difference in focal positions between blue and red light on the image plane when a single polychromatic principal ray from the object side is emitted as multiple rays due to dispersion in the refraction system. (See also...) Figure 7 The eyepiece system provided in this embodiment 1 has a maximum chromatic difference value of less than 20μm.

[0212] Example 2

[0213] The eyepiece system provided in this embodiment 2 is described in [reference]. Figure 8 It includes a display, a first optical component, and a second optical component arranged sequentially along the same optical axis;

[0214] The first optical component is located on the eye side and has a folded optical path structure. It includes a second lens 3, a third lens 4, a fourth lens 5, a first composite optical film 7, and a beam splitter 6. (See [link]) Figure 2 The first composite optical film 7 includes a first anti-reflection film 70, a first phase retarder 71, a polarization reflection element 72 and a first polarizing element 73 stacked in sequence. The beam splitting element 6 is disposed on the third surface 31 of the second lens 3, and the first composite optical film 7 is disposed on the seventh surface 51 of the fourth lens 5.

[0215] The second optical component is located on the display side and has a direct light path structure, including a first lens 2;

[0216] The display 1 is disposed along the optical axis on the side of the second optical component opposite to the first optical component, and a protective glass is disposed on the light-emitting surface of the display 1, the thickness of the protective glass being ≥0.5mm;

[0217] The eyepiece system also includes a second composite optical film 8, which is disposed on the first lens 2, for example, it can be disposed on the first surface 21 of the first lens 2 near the display 1, and is used to convert the light emitted from the display 1 into circularly polarized light.

[0218] See Figure 3 The second composite optical film 8 includes a second anti-reflective film 80, a second phase delayer 81, a third phase delayer 83, and a second polarizing element 82 disposed between the two phase delayers, which are stacked in sequence.

[0219] The specific parameters of the eyepiece optical system provided in this embodiment 2 are shown in Table 2 below, which includes the radius of curvature, thickness, material, and radius of the lens.

[0220] Table 2

[0221] Surface Radius (mm) Thickness (mm) Material Conic A2 A4 A6 A8 A10 A12 52 83.4516 2.0000 D-ZK3L-M90 1.83E+01 0.00E+00 -3.41E-06 -4.93E-09 -1.94E-11 4.08E-14 -1.76E-16 51 Infinity 0.5288 0.00E+00 0 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 42 37.1161 3.4307 IRG102 0.0000 0.0000 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 41 1508.2865 11.1894 0.0000 0.0000 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 32 -40.9925 2.0000 SFL4 0.0000 0.0000 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 31 -295.6183 0.3000 0.0000 0.0000 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 22 Infinity 1.5000 K26R 0.0000 0.0000 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 21 64.1536 2.7822 18.9448 0.0000 -2.113E-03 2.812E-04 -1.933E-05 7.645E-07 -1.738E-08

[0222] In addition, Table 4 following Example 3 shows other parameters (such as D1, D2, φ1, φ2 and φ) involved in Example 2. Please refer to Table 4 for details.

[0223] The eyepiece system provided in this embodiment 2 has the following optical performance: Figures 9 to 12 As shown: Figure 9 This is a schematic diagram of a dot-matrix diagram. Figure 10 It is an MTF curve. Figure 11 This is a diagram of the curvature and distortion. Figure 12 It is a vertical axis color difference diagram.

[0224] See Figure 9 The eyepiece system provided in this embodiment 2 has a maximum image size of less than 28μm in the dot matrix diagram.

[0225] See Figure 10 The MTF of the eyepiece system provided in this embodiment 2 is >0.2 at 12 lp / mm.

[0226] See Figure 11 The eyepiece system provided in this embodiment 2 has the maximum distortion occurring in the field of view, with an absolute value of less than 6%.

[0227] See Figure 12 The eyepiece system provided in this embodiment 2 has a maximum chromatic difference value of less than 20μm.

[0228] Example 3

[0229] See Figure 13 The optical architecture of the eyepiece system provided in this embodiment 3 is basically the same as that in embodiment 2 above. The difference is that the second composite optical film 8 is disposed on the third surface 31 of the second lens 3 near the first lens 2.

[0230] The specific parameters of the eyepiece optical system provided in this embodiment 3 are shown in Table 3 below, which includes the radius of curvature, thickness, material, and radius of the lens.

[0231] Table 3

[0232] Surface Radius (mm) Thickness (mm) Material Conic A2 A4 A6 A8 A10 A12 52 24.1509 4.7277 D-ZK3L-M90 -3.60E+00 0.00E+00 -3.41E-06 -4.93E-09 -1.94E-11 4.08E-14 -1.76E-16 51 Infinity 4.9463 0.00E+00 0 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 42 71.3862 3.2844 LLF7 0.0000 0.0000 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 41 -57.0548 0.8072 0.0000 0.0000 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 32 -40.9925 4.8700 SFL4 0.0000 0.0000 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 31 Infinity 1.0951 0.0000 0.0000 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 22 17.6561 1.5000 K26R -20.0000 0.0000 -1.151E-03 1.248E-05 -2.750E-07 1.848E-09 0.000E+00 21 8.8771 2.5000 -13.7570 0.0000 -2.488E-04 -8.074E-06 -8.696E-08 1.741E-09 0.000E+00

[0233] In addition, Table 4 following Example 3 shows other parameters involved in Example 3 (such as D1, D2, φ1, φ2 and φ), please refer to Table 4 for details.

[0234] The eyepiece system provided in this embodiment 3 has the following optical performance: Figures 14 to 17 As shown: Figure 14 This is a schematic diagram of a dot-matrix diagram. Figure 15 It is an MTF curve.Figure 16 This is a diagram of the curvature and distortion. Figure 17 It is a vertical axis color difference diagram.

[0235] See Figure 14 The eyepiece system provided in this embodiment 3 has a maximum image size of less than 14μm in the dot matrix diagram.

[0236] See Figure 15 The eyepiece system provided in this embodiment 3 has an MTF > 0.2 at 12 lp / mm.

[0237] See Figure 16 The eyepiece system provided in this embodiment 3 has the maximum distortion occurring in the field of view, with an absolute value of less than 6%.

[0238] See Figure 17 The eyepiece system provided in this embodiment 7 has a maximum chromatic difference value of less than 20μm.

[0239] Please refer to Table 4 for the values ​​of D1, D2, φ1, φ2 and φ in Examples 1 to 3 above.

[0240] Table 4

[0241]

[0242]

[0243] The specific implementation of the optical device in this application can refer to the various embodiments of the eyepiece optical system described above. Therefore, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0244] The above embodiments mainly describe 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. For the sake of brevity, they will not be elaborated here.

[0245] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. An eyepiece system, characterized in that, It includes a first optical component and a second optical component arranged along the same optical axis, wherein the first optical component and the second optical component have four lenses with optical power; The first optical component is located on the eye side and has a folded optical path structure, including at least two lenses, a first composite optical film (7) and a beam splitter (6). The first composite optical film (7) includes a first phase delayer (71) and a polarization reflection element (72) stacked together, and the first phase delayer (71) is located between the beam splitter (6) and the polarization reflection element (72). The second optical component is located on the display side and has a direct light path structure, including at least one transmissive lens; The eyepiece satisfies the following relationship: 30≤(|D1*φ1|-|D2*φ2|) / φ≤46; where D1 is the largest optical aperture in the first optical component, φ1 is the optical power of the first optical component, D2 is the largest optical aperture in the second optical component, φ2 is the optical power of the second optical component, and φ is the optical power of the entire eyepiece system.

2. The eyepiece system according to claim 1, characterized in that, The largest optical aperture D1 in the first optical component and the largest optical aperture D2 in the second optical component satisfy the following condition: D1-D2≥10mm.

3. The eyepiece system according to claim 1, characterized in that, The first optical component includes a third lens (4) and a fourth lens (5) arranged along the optical axis, wherein the third lens (4) is located between the fourth lens (5) and the second optical component; The first composite optical film (7) is disposed on the fourth lens (5); The beam splitter (6) is disposed on the third lens (4).

4. The eyepiece system according to claim 3, characterized in that, The first composite optical film (7) is disposed on the side surface of the fourth lens (5) near the third lens (4); The beam splitter (6) is disposed on the side surface of the third lens (4) near the second optical component.

5. The eyepiece system according to claim 4, characterized in that, The second optical component includes a first lens (2) and a second lens (3) arranged along the optical axis, wherein: The second lens (3) is positioned close to the third lens (4); The first lens (2) is positioned away from the third lens (4); Both the first lens (2) and the second lens (3) are transmission lenses.

6. The eyepiece system according to claim 1, characterized in that, The first optical component includes a second lens (3), a third lens (4), and a fourth lens (5) arranged sequentially along the optical axis, wherein: The fourth lens (5) is located near the eye side; The second lens (3) is close to the second optical component; The first composite optical film (7) is disposed on the fourth lens (5); The beam splitter (6) is disposed on the second lens (3).

7. The eyepiece system according to claim 6, characterized in that, The first composite optical film (7) is disposed on the side surface of the fourth lens (5) near the third lens (4); The beam splitter (6) is disposed on the side surface of the second lens (3) near the second optical component.

8. The eyepiece system according to claim 7, characterized in that, The second optical component includes a first lens (2) arranged along the optical axis, the first lens (2) being located on the side of the second lens (3) away from the third lens (4), and the first lens (2) being a transmission lens.

9. The eyepiece system according to any one of claims 1-8, characterized in that, The eyepiece system also includes a display (1) located on the display side, the display (1) being disposed along the optical axis on the side of the second optical component opposite to the first optical component; The display (1) has a protective glass on its light-emitting surface, and the thickness of the protective glass is ≥0.5mm.

10. The eyepiece system according to claim 9, characterized in that, The eyepiece system also includes a second composite optical film (8), which is disposed between the display (1) and the first optical component, for converting the light emitted from the display (1) into circularly polarized light; The second composite optical film (8) includes a second phase retarder (81), a third phase retarder (83), and a second polarizing element (82) disposed between the two phase retarders.

11. The eyepiece system according to claim 10, characterized in that, The second composite optical film (8) is disposed on the light-emitting surface of the display (1).

12. The eyepiece system according to claim 10, characterized in that, The optical component includes a second lens (3), a third lens (4) and a fourth lens (5) arranged sequentially along the optical axis. The second optical component includes a first lens (2) arranged along the optical axis. The second composite optical film (8) is disposed on the first lens (2) or the second lens (3).

13. The eyepiece system according to any one of claims 1-7, characterized in that, The first composite optical film (7) further includes a first polarizing element (73), which is disposed on the side surface of the polarizing reflective element (72) away from the first phase delayer (71).

14. An optical device, characterized in that, include: The eyepiece system as described in any one of claims 1-13; and An objective lens, located on the display side of the eyepiece system.

Images