Visual optical system

Abstract

The utility model provides a visual optical system, which comprises a first optical system and a second optical system, the first optical system comprises a first element group, a second element group and a third element group, the first element group comprises a first lens, and the second element group comprises a second lens; the second optical system includes first to sixth lenses. The effective focal length Fe of the first optical system and the effective focal length Fp of the second optical system meet the formula: 10lt; fe / Fplt; 17; the sum Sigma CTe of the center thicknesses of the first lens, the second lens and the third lens and the effective focal length Fe of the first optical system meet the following condition: 0.8 < = Sigma CTe / Fult; 1.2; the sum sigma CTp of the center thicknesses of the first to sixth lenses and the effective focal length Fp of the second optical system satisfy the following conditions: 3.0 lt; [sigma] CTp / Fplt; 5.0. According to the utility model, the problem that miniaturization and high image quality of a visual optical system in the prior art are difficult to consider at the same time is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of VR devices, and more particularly, to a visual optical system. Background Art

[0002] The VR Pancake visual system mainly involves two aspects: virtual reality and eye tracking. Combining these two technologies allows users to be fully immersed when interacting with the virtual world. However, in the existing visual optical systems, the cooperation between the optical system that cooperates with the human eye and the optical system that acquires the real environment is poor. Not only is the spatial distribution unreasonable, making the overall volume and weight of the visual optical system large, but also there are problems such as poor imaging quality and unsatisfactory visual effects, making it difficult for users to wear for a long time, and the experience and immersion are poor. Therefore, how to control the focal length and size cooperation between the two systems, while improving the imaging effect of the visual optical system and reducing the volume and weight, is a very important issue. Summary of the Utility Model

[0003] The main purpose of the present utility model is to provide a visual optical system to solve the problem that it is difficult to balance miniaturization and high image quality in the existing visual optical systems.

[0004] To achieve the above object, according to one aspect of the present utility model, there is provided a visual optical system, which includes a first optical system and a second optical system. The first optical system sequentially includes a first element group, a second element group, and a third element group along a first optical axis from a first side to a second side. The first element group sequentially includes a first polarizer, a reflective polarizing element, a first quarter-wave plate, and a first lens along the first optical axis from the first side to the second side. The second element group sequentially includes a second quarter-wave plate, a second polarizer, a third quarter-wave plate, and a second lens along the first optical axis from the first side to the second side. The third element group includes a third lens. The second optical system sequentially includes a first lens with a negative focal power, a second lens with a negative focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, a fifth lens with a negative focal power, and a sixth lens with a positive focal power along a second optical axis from an object side to an image side. Wherein, the effective focal length Fe of the first optical system and the effective focal length Fp of the second optical system satisfy: 10 < Fe / Fp < 17; the sum ∑CTe of the central thicknesses of the first lens, the second lens, and the third lens and the effective focal length Fe of the first optical system satisfy: 0.8 ≤ ∑CTe / Fe < 1.2; the sum ∑CTp of the central thicknesses of the first lens to the sixth lens and the effective focal length Fp of the second optical system satisfy: 3.0 < ∑CTp / Fp < 5.0.

[0005] According to another aspect of the present utility model, a visual optical system is provided. The visual optical system includes a first optical system and a second optical system. The first optical system sequentially includes a first element group, a second element group, and a third element group along a first optical axis from a first side to a second side. The first element group sequentially includes a first polarizer, a reflective polarizing element, a first quarter-wave plate, and a first lens along the first optical axis from the first side to the second side. The second element group sequentially includes a second quarter-wave plate, a second polarizer, a third quarter-wave plate, and a second lens along the first optical axis from the first side to the second side. The third element group includes a third lens. The second optical system sequentially includes a first lens with a negative focal power, a second lens with a negative focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, a fifth lens with a negative focal power, and a sixth lens with a positive focal power along a second optical axis from an object side to an image side. Wherein, the following relationships are satisfied between the effective focal length Fe of the first optical system and the effective focal length Fp of the second optical system: 10 < Fe / Fp < 17; the following relationship is satisfied between the maximum radius DTemax in the first element group, the second element group, and the third element group and the maximum radius DTpmax in the first lens to the sixth lens: 4.5 < DTemax / DTpmax < 7.5; the following relationship is satisfied between the maximum radius DTemax in the first element group, the second element group, and the third element group and the effective focal length Fe of the first optical system: 0.9 < DTemax / Fe < 1.5. The visual optical system of the present application connects the human eye with the virtual world through the first optical system, and the second optical system acquires the picture of the real world. Among them, in the first optical system, the polarization beam splitter, the reflective polarizing element, and the quarter-wave plate are used to realize multiple refractions and reflections of the optical path, fold the required optical path without affecting the projection quality, effectively compress the length of the first optical system, and reduce the weight of the first optical system. The second optical system uses six lenses, and the first lens and the second lens have negative focal powers, which is beneficial to increasing the field of view angle of the system, obtaining a wider range and more real information of the real world, and enhancing the user's immersion experience. The combination of the first optical system and the second optical system can more accurately realize the interaction between the virtual world and the real world. By respectively controlling the focal lengths of the first optical system and the second optical system, restricting the ratio of their focal lengths, and at the same time restricting the relationship between the maximum radii of the element groups and lenses in the first optical system and the second optical system and the focal length of the second optical system, the field of view angle is increased as much as possible, the light convergence ability is improved, the light is utilized to the maximum extent, the light transmission efficiency of the visual optical system is improved, and the energy loss is reduced. At the same time, the size and weight of the visual optical system are minimized to make it more compact and便于集成, so as to reduce the weight of the head-mounted display and improve the immersion感.

[0006] It should be noted that the term "便于集成" in the original text is not a standard English expression. It is tentatively translated as "facilitate integration" here, but you may need to adjust it according to the specific context and professional requirements. Also, the "感" at the end of the text seems to be an incomplete or incorrect expression in Chinese. If there is more specific information, it can be translated more accurately.Furthermore, the distance TDe on the first optical axis from the first side surface of the first polarizer to the second side surface of the third lens, the maximum radius DTL1 of the first polarizer, the distance TDp on the second optical axis from the object side surface of the first lens to the image side surface of the sixth lens, and the maximum effective radius DT11p of the object side surface of the first lens satisfy: 11 < (TDe * DTL1) / (TDp * DT11p) < 20.

[0007] Furthermore, the maximum radius DTemax among the first element group, the second element group, and the third element group and the maximum radius DTpmax among the first lens to the sixth lens satisfy: 4.5 < DTemax / DTpmax < 7.5.

[0008] Furthermore, the entrance pupil diameter EPDe of the first optical system and the entrance pupil diameter EPDp of the second optical system satisfy: 5.5 < EPDe / EPDp < 8.5.

[0009] Furthermore, the maximum radius DTemax among the first element group, the second element group, and the third element group and the effective focal length Fe of the first optical system satisfy: 0.9 < DTemax / Fe < 1.5.

[0010] Furthermore, the effective focal length Fe of the first optical system and the distance SLR on the first optical axis from the stop of the first optical system to the first polarizer satisfy: 1.0 < Fe / SLR ≤ 1.5.

[0011] Furthermore, the effective focal length FG1e of the first element group and the combined focal length f23e of the second lens and the third lens satisfy: -2.0 < FG1e / f23e < 1.0.

[0012] Furthermore, the effective focal length FG1e of the first element group and the effective focal length f2e of the second lens satisfy: 0 < FG1e / f2e < 1.0, and the effective focal length FG1e of the first element group and the effective focal length f3e of the third lens satisfy: -2.0 < FG1e / f3e < 0.5.

[0013] Furthermore, the effective focal length FG1e of the first element group, the central thickness CTL1 of the first polarizer, the central thickness CTR of the reflective polarizing element, the central thickness CTQ1 of the first quarter-wave plate, and the central thickness CT1e of the first lens satisfy: 2.0 < FG1e / (CTL1 + CTR + CTQ1 + CT1e) < 3.0.

[0014] Furthermore, the effective focal length f3e of the third lens, the radius of curvature R5e of the first side surface of the third lens, and the radius of curvature R6e of the second side surface of the third lens satisfy: -2.0 < |f3e| / (R5e + R6e) < 0.

[0015] Further, the refractive index NQ2 of the second quarter wave plate, the center thickness CTQ2 of the second quarter wave plate, the refractive index NL2 of the second polarizer, the center thickness CTL2 of the second polarizer, the refractive index NQ3 of the third quarter wave plate, the center thickness CTQ3 of the third quarter wave plate, the refractive index N2e of the second lens, the center thickness CT2e of the second lens, and the effective focal length FG2e of the second element group satisfy: 0<(NQ2*CTQ2+NL2*CTL2+NQ3*CTQ3+N2e*CT2e) / FG2e≤0.5.

[0016] Furthermore, the distance TDp from the object side surface of the first lens to the image side surface of the sixth lens on the second optical axis and the effective focal length Fp of the second optical system satisfy the following relationship: 4.5 <TDp / Fp≤6.0。

[0017] Furthermore, the distance TDp from the object side surface of the first lens to the image side surface of the sixth lens on the second optical axis and the maximum half field angle Semi-FOVp of the second optical system satisfy the following conditions: 1.0 <TDp / TAN(Semi-FOVp)<3.5。

[0018] Furthermore, the effective focal length f1p of the first lens, the effective focal length f2p of the second lens, and the effective focal length Fp of the second optical system satisfy the following relationship: -10<(f1p+f2p) / Fp<-5.0.

[0019] Furthermore, the effective focal length f4p of the fourth lens, the effective focal length f5p of the fifth lens, and the effective focal length Fp of the second optical system satisfy the following relationship: 0<|f4p+f5p| / Fp<0.5.

[0020] Furthermore, the effective focal length f3p of the third lens, the curvature radius R5p of the object side surface of the third lens, and the curvature radius R6p of the image side surface of the third lens satisfy: -1.0 <f3p / (R5p+R6p)<0。

[0021] Furthermore, the effective focal length f6p of the sixth lens and the effective focal length Fp of the second optical system satisfy: 2.0 <f6p / Fp<3.5。

[0022] Applying the technical solution of the present utility model, the visual optical system includes a first optical system and a second optical system. The first optical system sequentially includes a first element group, a second element group, and a third element group along a first optical axis from a first side to a second side. The first element group sequentially includes a first polarizer, a reflective polarizing element, a first quarter-wave plate, and a first lens along the first optical axis from the first side to the second side. The second element group sequentially includes a second quarter-wave plate, a second polarizer, a third quarter-wave plate, and a second lens along the first optical axis from the first side to the second side. The third element group includes a third lens. The second optical system sequentially includes a first lens with a negative focal power, a second lens with a negative focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, a fifth lens with a negative focal power, and a sixth lens with a positive focal power along a second optical axis from an object side to an image side. Among them, the following relationships are satisfied between the effective focal length Fe of the first optical system and the effective focal length Fp of the second optical system: 10 < Fe / Fp < 17; the following relationship is satisfied between the sum ∑CTe of the central thicknesses of the first lens, the second lens, and the third lens and the effective focal length Fe of the first optical system: 0.8 ≤ ∑CTe / Fe < 1.2; the following relationship is satisfied between the sum ∑CTp of the central thicknesses of the first lens to the sixth lens and the effective focal length Fp of the second optical system: 3.0 < ∑CTp / Fp < 5.0.

[0023] The visual optical system of this application connects the human eye with the virtual world through the first optical system, and the second optical system acquires the picture of the real world. Among them, in the first optical system, the polarization element, the reflective polarizing element, and the quarter-wave plate are used to realize multiple refractions and reflections of the optical path, fold the required optical path without affecting the projection quality, effectively compress the length of the first optical system, and reduce the weight of the first optical system. The second optical system uses six lenses, and the first lens and the second lens have negative focal powers, which is beneficial to increasing the field of view angle of the system, obtaining a wider range and more real information of the real world, and enhancing the user's immersion experience. The combination of the first optical system and the second optical system can more accurately realize the interaction between the virtual world and the real world. By separately controlling the focal lengths and central thicknesses of the first optical system and the second optical system, and restricting the focal length ratio of the two at the same time, the relationship between the screen size of the first optical system and the chip size of the second optical system is established. On the one hand, the size of the first optical system is relatively large, which is beneficial to improving the immersion experience. On the other hand, the size of the second optical system is small while ensuring performance, which is beneficial to the overall layout of the machine, promotes the miniaturization of the visual optical system, improves the user's experience, and increases the possibility of long-term wearing. Description of the Drawings

[0024] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0025] Figure 1 A schematic structural diagram of a visual optical system of an optional embodiment of the utility model is shown;

[0026] Figure 2 Shows Figure 1 A front view of the visual optical system in FIG.

[0027] Figure 3 Shows Figure 1 Rear view of the visual optical system in;

[0028] Figure 4 A schematic diagram showing the structure of the first optical system of the first embodiment of the utility model is shown;

[0029] Figure 5 The MTF curve of the first optical system of the first embodiment of the utility model is shown;

[0030] Figure 6 A schematic diagram showing the structure of the first optical system of the second embodiment of the utility model is shown;

[0031] Figure 7 The MTF curve of the first optical system of the second embodiment of the utility model is shown;

[0032] Figure 8 A schematic diagram showing the structure of the first optical system of the third embodiment of the utility model is shown;

[0033] Fig. 9 The MTF curve of the first optical system of the third embodiment of the present utility model is shown;

[0034] Fig.10 A schematic diagram of the structure of the first optical system of the fourth embodiment of the utility model is shown;

[0035] Fig.11 The MTF curve of the first optical system of the fourth embodiment of the utility model is shown;

[0036] Fig.12 A schematic diagram showing the structure of the second optical system of the fifth embodiment of the present utility model is shown;

[0037] Figures 13 to 16 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the second optical system of the fifth embodiment of the utility model are shown;

[0038] Fig.17 It shows a schematic structural diagram of the second optical system of the sixth embodiment of the utility model;

[0039] Figures 18 to 21The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the second optical system of the sixth embodiment of the utility model are shown;

[0040] Fig. 22 A schematic diagram of the structure of the second optical system of Embodiment 7 of the present utility model is shown;

[0041] Figure 23 to Figure 26 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the second optical system of the seventh embodiment of the utility model are shown;

[0042] Fig. 27 A schematic diagram showing the structure of the second optical system of Embodiment 8 of the present utility model is shown;

[0043] Figure 28 to Figure 31 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the second optical system of the eighth embodiment of the utility model are shown.

[0044] The above drawings include the following reference numerals:

[0045] 10. First optical system; STOe, aperture of the first optical system; LP1, first polarizer; RP, reflective polarizer; QWP1, first quarter wave plate; E1e, first lens; QWP2, second quarter wave plate; LP2, second polarizer; QWP3, third quarter wave plate; E2e, second lens; E3e, third lens; 20. Second optical system; E1, first lens; S1, object side surface of the first lens; S2, image side surface of the first lens; E2, second lens; S3, object side surface of the second lens; S4, second lens The image side surface of the second optical system; E3, the third lens; S5, the object side surface of the third lens; S6, the image side surface of the third lens; E4, the fourth lens; S7, the object side surface of the fourth lens; S8, the image side surface of the fourth lens; E5, the fifth lens; S9, the object side surface of the fifth lens; S10, the image side surface of the fifth lens; E6, the sixth lens; S11, the object side surface of the sixth lens; S12, the image side surface of the sixth lens; E7, the filter; S13, the object side surface of the filter; S14, the image side surface of the filter; S15, the imaging surface of the second optical system; 30, the third optical system. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0048] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0049] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0050] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0051] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of ordinary knowledgeable people in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the eye-side surface, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the display-side surface, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0052] In the visual optical system of the present application, the surface of each component in the first optical system 10 that is closest to the first side is called the first side of the component, and the surface of each component that is closest to the second side is called the second side of the component. Optionally, the first side may be the human eye side, and the second side may be the display side. Accordingly, the first side of each component may be called the side close to the human eye, and the second side may be called the side close to the display. In the second optical system 20, the surface of each lens that is closest to the subject is called the object side of the lens, and the surface of each lens that is closest to the imaging surface is called the image side of the lens.

[0053] In order to solve the problem in the prior art that it is difficult to achieve both miniaturization and high image quality of visual optical systems, the utility model provides a visual optical system.

[0054] First embodiment

[0055] As Figures 1 to 31 shown, the present utility model provides a visual optical system. The visual optical system includes a first optical system and a second optical system. The first optical system sequentially includes a first element group, a second element group, and a third element group along a first optical axis from a first side to a second side. The first element group sequentially includes a first polarizer, a reflective polarizing element, a first quarter-wave plate, and a first lens along the first optical axis from the first side to the second side. The second element group sequentially includes a second quarter-wave plate, a second polarizer, a third quarter-wave plate, and a second lens along the first optical axis from the first side to the second side. The third element group includes a third lens. The second optical system sequentially includes a first lens with a negative focal power, a second lens with a negative focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, a fifth lens with a negative focal power, and a sixth lens with a positive focal power along a second optical axis from an object side to an image side. Among them, the effective focal length Fe of the first optical system and the effective focal length Fp of the second optical system satisfy: 10 < Fe / Fp < 17. The sum ∑CTe of the central thicknesses of the first lens, the second lens, and the third lens and the effective focal length Fe of the first optical system satisfy: 0.8 ≤ ∑CTe / Fe < 1.2. The sum ∑CTp of the central thicknesses of the first lens to the sixth lens and the effective focal length Fp of the second optical system satisfy: 3.0 < ∑CTp / Fp < 5.0.

[0056] The visual optical system of the present application connects the human eye with the virtual world through the first optical system, and the second optical system acquires the picture of the real world. Among them, in the first optical system, the polarization element, the reflective polarizing element, and the quarter-wave plate are used to realize multiple refractions and reflections of the optical path, fold the required optical path without affecting the projection quality, effectively compress the length of the first optical system, and reduce the weight of the first optical system. The second optical system uses six lenses. The first lens and the second lens have negative focal powers, which are beneficial to increasing the field of view angle of the system, obtaining a wider range and more real information of the real world, and enhancing the user's immersion experience. The combination of the first optical system and the second optical system can more accurately realize the interaction between the virtual world and the real world. By respectively controlling the focal lengths and central thicknesses of the first optical system and the second optical system, and restricting the focal length ratio of the two at the same time, the relationship between the screen size of the first optical system and the chip size of the second optical system is established. On the one hand, the size of the first optical system is relatively large, which is beneficial to improving the immersion experience. On the other hand, the size of the second optical system is small while ensuring performance, which is beneficial to the overall arrangement of the machine, promotes the miniaturization of the visual optical system, improves the user's experience, and increases the possibility of long-term wearing.

[0057] Preferably, 10.5 < Fe / Fp < 16.8.

[0058] Preferably, 0.81 ≤ ∑CTe / Fe < 1.15.

[0059] Preferably, 3.2 < ∑CTp / Fp < 4.8.

[0060] In this embodiment, the distance TDe on the first optical axis from the first side surface of the first polarizer to the second side surface of the third lens, the maximum radius DTL1 of the first polarizer, the distance TDp on the second optical axis from the object side surface of the first lens to the image side surface of the sixth lens, and the maximum effective radius DT11p of the object side surface of the first lens satisfy: 11 < (TDe * DTL1) / (TDp * DT11p) < 20. By restricting (TDe * DTL1) / (TDp * DT11p) within a reasonable range, it is beneficial to the reflection and convergence of all light in the first optical system, and at the same time beneficial to the convergence of light with a large field of view angle in the second optical system. Preferably, 11.1 < (TDe * DTL1) / (TDp * DT11p) < 19.5.

[0061] In this embodiment, the maximum radius DTemax among the first element group, the second element group, and the third element group and the maximum radius DTpmax among the first lens to the sixth lens satisfy: 4.5 < DTemax / DTpmax < 7.5. By restricting DTemax / DTpmax within a reasonable range, the maximum radii of the first element group to the third element group in the first optical system decrease in sequence, and at the same time control the lens diameter of the second optical system, while increasing the field of view angle as much as possible and improving the light convergence ability, reducing the weight of the head-mounted display and enhancing the immersion feeling. Preferably, 4.6 < DTemax / DTpmax < 7.4.

[0062] In this embodiment, the entrance pupil diameter EPDe of the first optical system and the entrance pupil diameter EPDp of the second optical system satisfy: 5.5 < EPDe / EPDp < 8.5. By restricting EPDe / EPDp within a reasonable range, it is beneficial to control the angle of light entering the optical system by adjusting the entrance pupil diameter of the optical system. The first optical system has a larger entrance pupil diameter, which can allow more light to pass through the first optical system, thereby increasing the brightness and sensitivity of the first optical system, and at the same time reducing the aberration of the visual optical system and improving the clarity and resolution of imaging. The second optical system has a smaller entrance pupil diameter, which can limit the propagation range of light, reduce scattering and interference in the second optical system, and thus improve the imaging quality. Preferably, 5.6 < EPDe / EPDp < 8.4.

[0063] In this embodiment, the maximum radius DTemax among the first element group, the second element group, and the third element group and the effective focal length Fe of the first optical system satisfy: 0.9 < DTemax / Fe < 1.5. By restricting DTemax / Fe within a reasonable range and reasonably distributing the maximum radius and effective focal length of each lens, it is possible to minimize the size and weight of the visual optical system while maintaining optical performance, making it more compact and convenient for integration, maximizing the utilization of light, improving the light transmission efficiency of the visual optical system, and reducing energy loss. Preferably, 0.93 < DTemax / Fe < 1.40.

[0064] In this embodiment, the effective focal length Fe of the first optical system and the distance SLR from the aperture of the first optical system to the first polarizer on the first optical axis satisfy: 1.0 < Fe / SLR ≤ 1.5. By restricting Fe / SLR within a reasonable range and simultaneously controlling the effective focal length of the first optical system and the distance from the aperture to the first polarizer, it is possible to improve the aberration of the first optical system, increase the light flux of the first optical system, and optimize the imaging quality of the visual optical system. Preferably, 1.10 < Fe / SLR ≤ 1.51.

[0065] In this embodiment, the effective focal length FG1e of the first element group and the combined focal length f23e of the second lens and the third lens satisfy: -2.0 < FG1e / f23e < 1.0. By restricting FG1e / f23e within a reasonable range and adjusting the relative position or curvature of the second and third lenses, it is possible to make the propagation path of light in the first optical system more uniform, realize the adjustment of the combined focal length of the two lenses and the effective focal length of the first element group, and at the same time correct the aberration and distortion of the first optical system, improve the quality and accuracy of the image, and also minimize optical problems such as aberration, defocus, and scattering of the visual optical system, and improve the resolution, contrast, and color reproducibility. Preferably, -1.9 < FG1e / f23e < 0.9.

[0066] In this embodiment, the effective focal length FG1e of the first element group and the effective focal length f2e of the second lens satisfy: 0 < FG1e / f2e < 1.0, and the effective focal length FG1e of the first element group and the effective focal length f3e of the third lens satisfy: -2.0 < FG1e / f3e < 0.5. By restricting FG1e / f2e and FG1e / f3e within reasonable ranges and adjusting the effective focal lengths of the second and third lenses, it is possible to correct the aberration (spherical aberration, chromatic aberration, astigmatism, and distortion, etc.) of each lens, minimize these aberrations, make the imaging clearer and more accurate, improve the performance of the first optical system, and thus improve the imaging quality. Preferably, 0 < FG1e / f2e < 0.9, -1.9 < FG1e / f3e < 0.4.

[0067] In this embodiment, the following relationship is satisfied among the effective focal length FG1e of the first element group, the central thickness CTL1 of the first polarizer, the central thickness CTR of the reflective polarizing element, the central thickness CTQ1 of the first quarter-wave plate, and the central thickness CT1e of the first lens: 2.0 < FG1e / (CTL1 + CTR + CTQ1 + CT1e) < 3.0. By restricting FG1e / (CTL1 + CTR + CTQ1 + CT1e) within a reasonable range and adjusting the central thickness of the reflective polarizing element, the propagation path of light in the first optical system can be changed, and the ratio of the effective focal length of the first element group to the central thicknesses of the reflective polarizing element, the first quarter-wave plate, and the first lens can be controlled, such that the effective focal length of the first optical system is relatively large and the central thicknesses of the reflective polarizing element and the first quarter-wave plate are relatively small, controlling the size of the first optical system and facilitating more room for optimizing the performance of the second optical system. Preferably, 2.2 < FG1e / (CTL1 + CTR + CTQ1 + CT1e) < 2.8.

[0068] In this embodiment, the following relationship is satisfied among the effective focal length f3e of the third lens, the curvature radius R5e of the first side surface of the third lens, and the curvature radius R6e of the second side surface of the third lens: -2.0 < |f3e| / (R5e + R6e) < 0. By restricting |f3e| / (R5e + R6e) within a reasonable range and controlling the curvature radii of the first and second side surfaces of the third lens, on the one hand, the shape of the third lens is controlled, facilitating the molding of the third lens; on the other hand, the optical power of the third lens is controlled, and by reasonably distributing the optical power of the first optical system, it is beneficial to correct the aberration of the first optical system, thereby improving the imaging quality. Preferably, -1.9 < |f3e| / (R5e + R6e) < 0.

[0069] In this embodiment, the refractive index NQ2 of the second quarter-wave plate, the central thickness CTQ2 of the second quarter-wave plate, the refractive index NL2 of the second polarizer, the central thickness CTL2 of the second polarizer, the refractive index NQ3 of the third quarter-wave plate, the central thickness CTQ3 of the third quarter-wave plate, the refractive index N2e of the second lens, the central thickness CT2e of the second lens, and the effective focal length FG2e of the second element group satisfy: 0 < (NQ2 * CTQ2 + NL2 * CTL2 + NQ3 * CTQ3 + N2e * CT2e) / FG2e ≤ 0.5. By restricting (NQ2 * CTQ2 + NL2 * CTL2 + NQ3 * CTQ3 + N2e * CT2e) / FG2e within a reasonable range and controlling the refractive index and thickness of the second quarter-wave plate, the phase delay in the first optical system can be precisely adjusted, thereby achieving phase correction and optical path control. At the same time, by controlling the refractive index, central thickness of the second polarizer, the refractive index, central thickness of the third quarter-wave plate, and the refractive index, central thickness of the second lens, in cooperation with the effective focal length of the second element group, functions such as phase control, polarization adjustment, focal length adjustment, and dispersion correction of the first optical system can be achieved simultaneously. Preferably, 0 < (NQ2 * CTQ2 + NL2 * CTL2 + NQ3 * CTQ3 + N2e * CT2e) / FG2e < 0.48.

[0070] In this embodiment, the distance TDp on the second optical axis from the object side of the first lens to the image side of the sixth lens and the effective focal length Fp of the second optical system satisfy: 4.5 < TDp / Fp ≤ 6.0. By restricting TDp / Fp within a reasonable range and controlling the ratio of the distance from the object side of the first lens to the image side of the sixth lens to the effective focal length of the second optical system, it can be ensured that the image seen by the observer is always clear, keeping the observer's line of sight stable, not affected by external interference or body movement, and obtaining a better visual effect and a comfortable observation experience. Preferably, 4.60 < TDp / Fp < 5.98.

[0071] In this embodiment, the distance TDp on the second optical axis from the object side of the first lens to the image side of the sixth lens and the maximum half field of view angle Semi-FOVp of the second optical system satisfy: 1.0 < TDp / TAN(Semi-FOVp) < 3.5. By restricting TDp / TAN(Semi-FOVp) within a reasonable range, the distance between the lenses can be controlled, the image plane from the first lens to the sixth lens can be kept flat, thereby reducing the image field distortion and improving the imaging quality. Also, the maximum half field of view angle of the second optical system can be increased to expand the observable field of view range. By optimizing the ratio of the distance between the lenses to the maximum half field of view angle, the flatness of the image field and the imaging quality are balanced, and better image clarity and resolution are obtained. Preferably, 1.05 < TDp / TAN(Semi-FOVp) < 3.40.

[0072] In this embodiment, the effective focal length f1p of the first lens, the effective focal length f2p of the second lens, and the effective focal length Fp of the second optical system satisfy: -10 < (f1p + f2p) / Fp < -5.0. By restricting (f1p + f2p) / Fp within a reasonable range and adjusting the ratio of the sum of the effective focal lengths of the first lens and the second lens of the second optical system to the effective focal length of the second optical system, further correction of the distortion of the second optical system can be achieved, and the performance and application flexibility of the visual optical system can be improved. Preferably, -9.9 < (f1p + f2p) / Fp < -5.1.

[0073] In this embodiment, the effective focal length f4p of the fourth lens, the effective focal length f5p of the fifth lens, and the effective focal length Fp of the second optical system satisfy: 0 < |f4p + f5p| / Fp < 0.5. By restricting |f4p + f5p| / Fp within a reasonable range and controlling the ratio of the sum of the effective focal lengths of the fourth lens and the fifth lens to the effective focal length of the second optical system, it is beneficial for the convergence of large field of view angle light rays, beneficial for reducing the volume of the visual optical system, and facilitating the miniaturization of the head-mounted device. Preferably, 0.10 < |f4p + f5p| / Fp < 0.45.

[0074] In this embodiment, the effective focal length f3p of the third lens, the radius of curvature R5p of the object side of the third lens, and the radius of curvature R6p of the image side of the third lens satisfy: -1.0 < f3p / (R5p + R6p) < 0. By restricting f3p / (R5p + R6p) within a reasonable range and controlling the ratio of the effective focal length of the third lens to the sum of the radii of curvature of the object side and the image side of the third lens, it is beneficial for controlling the curvature of the lens in the second optical system and facilitating the shaping of the lens in the second optical system. Preferably, -0.9 < f3p / (R5p + R6p) < -0.1.

[0075] In this embodiment, the effective focal length f6p of the sixth lens and the effective focal length Fp of the second optical system satisfy: 2.0 < f6p / Fp < 3.5. By restricting f6p / Fp within a reasonable range and controlling the effective focal length of the sixth lens, the optical power of the second optical system can be indirectly adjusted, which is beneficial to correcting the aberration of the visual optical system. Preferably, 2.1 < f6p / Fp < 3.4.

[0076] Second Embodiment

[0077] As Figures 1 to 31 shown, the present utility model provides a visual optical system, which includes a first optical system and a second optical system. The first optical system sequentially includes a first element group, a second element group, and a third element group along the first optical axis from the first side to the second side. The first element group sequentially includes a first polarizer, a reflective polarizing element, a first quarter-wave plate, and a first lens along the first optical axis from the first side to the second side. The second element group sequentially includes a second quarter-wave plate, a second polarizer, a third quarter-wave plate, and a second lens along the first optical axis from the first side to the second side. The third element group includes a third lens. The second optical system sequentially includes a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, and a sixth lens with a positive optical power along the second optical axis from the object side to the image side. Among them, the effective focal length Fe of the first optical system and the effective focal length Fp of the second optical system satisfy: 10 < Fe / Fp < 17. The maximum radius DTemax among the first element group, the second element group, and the third element group and the maximum radius DTpmax among the first lens to the sixth lens satisfy: 4.5 < DTemax / DTpmax < 7.5. The maximum radius DTemax among the first element group, the second element group, and the third element group and the effective focal length Fe of the first optical system satisfy: 0.9 < DTemax / Fe < 1.5.

[0078] The visual optical system of the present application connects the human eye with the virtual world through the first optical system, and the second optical system obtains the picture of the real world. In the first optical system, a polarizer, a reflective polarizing element and a 1 / 4 wave plate are used to realize multiple refractions of the light path, and the required optical path is folded without affecting the projection quality, which effectively compresses the length of the first optical system and reduces the weight of the first optical system. The second optical system uses six lenses, in which the first lens and the second lens have negative optical focal length, which is conducive to increasing the field of view of the system, obtaining a wider range and more realistic information in the real world, and enhancing the user's sense of immersion. The combination of the first optical system and the second optical system can more accurately realize the interaction between the virtual world and the real world. By controlling the focal lengths of the first optical system and the second optical system respectively, restricting the focal length ratio of the two, and limiting the relationship between the maximum radius of the element group and the lens in the first optical system and the second optical system and the focal length of the second optical system, the field of view angle is increased as much as possible, the light convergence ability is improved, the light is utilized to the maximum extent, the light transmission efficiency of the visual optical system is improved, and the energy loss is reduced. At the same time, the size and weight of the visual optical system are minimized to make it more compact and easy to integrate, so as to reduce the weight of the head display and improve the immersion.

[0079] Preferably, 10.5 <Fe / Fp<16.8。

[0080] Preferably, 4.6 <DTemax / DTpmax<7.4。

[0081] Preferably, 0.93 <DTemax / Fe<1.40

[0082] This embodiment may also include other parameter formulas in the first embodiment, which will not be described in detail here.

[0083] like Figures 1 to 3 As shown, the visual optical system is not limited to the first optical system 10 and the second optical system 20, and a third optical system 30 may be provided, that is, there may be 2, 3 or more optical systems.

[0084] The second optical system in the present application may use multiple lenses, such as the six lenses mentioned above. By reasonably allocating the effective focal length, surface shape, center thickness of each lens, and axial distance between each lens, etc., the aperture of the second optical system can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the second optical system more conducive to production and processing and applicable to more portable electronic devices.

[0085] In the present application, the mirror surface of at least one of the first lens to the sixth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0086] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the second optical system can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the second optical system is not limited to including six lenses. If necessary, the second optical system may also include other numbers of lenses.

[0087] The following further describes examples of specific surface shapes and parameters of the first optical system applicable to the above-mentioned embodiment with reference to the accompanying drawings.

[0088] Embodiment 1

[0089] like Figure 4 and Figure 5 As shown, the first optical system of the first embodiment of the present application is described.

[0090] like Figure 4 As shown, the first optical system includes the aperture STOe, the first element group, the second element group and the third element group of the first optical system from the first side to the second side, the first element group includes the first polarizer LP1, the reflective polarizer RP, the first 1 / 4 wave plate QWP1 and the first lens E1e from the first side to the second side along the first optical axis, the second element group includes the second 1 / 4 wave plate QWP2, the second polarizer LP2, the third 1 / 4 wave plate QWP3 and the second lens E2e from the first side to the second side along the first optical axis, and the third element group includes the third lens E3e. Among them, the first polarizer LP1, the reflective polarizer RP, and the first 1 / 4 wave plate QWP1 are attached together in sequence from the first side to the second side, and the second side surface of the first 1 / 4 wave plate QWP1 is attached to the first side surface of the first lens E1e, and the first side surface of the first lens E1e is a plane. A partial reflection layer is attached to the second side surface of the first lens E1e, so that when the light is incident on the partial reflection layer, it is reflected and the propagation direction is changed.

[0091] In this embodiment, the first side refers to the human eye side, and the second side refers to the display side.

[0092] Table 1 shows a basic structural parameter table of the first optical system of Example 1, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all in millimeters (mm). In Table 1, the arrangement order of the serial numbers is the order in which the light passes, and the refraction / reflection is the refraction or reflection effect of the surface on the light during this passage.

[0093] Serial number Parts Surface type Radius of curvature thickness Refractive Index Abbe number Refraction / Reflection Cone coefficient Human eye side Spherical 1 Aperture STOe of the first optical system Spherical endless 12.0000 refraction 2 The first polarizer LP1 Spherical endless 0.1039 1.49 57.47 refraction 3 Reflective polarizing element RP Spherical endless 0.0939 1.49 57.47 refraction 4 The first 1 / 4 wave plate QWP1 Spherical endless 0.1837 1.49 57.47 refraction 5 First lens E1e Spherical endless 5.0000 1.54 55.71 refraction 6 Aspheric -48.0359 -5.0000 1.54 55.71 reflection -27.5810 7 Spherical endless -0.1837 1.49 57.47 refraction 8 Spherical endless 0.1837 1.49 57.47 reflection 9 First lens E1e Spherical endless 5.0000 1.54 55.71 refraction 10 Aspheric -48.0359 1.1168 refraction -27.5810 11 Second 1 / 4 wave plate QWP2 Spherical endless 0.0700 1.49 57.47 refraction 12 Second polarizer LP2 Spherical endless 0.0800 1.49 57.47 refraction 13 The third 1 / 4 wave plate QWP3 Spherical endless 0.0800 1.49 57.47 refraction 14 Second lens E2e Spherical endless 7.0000 1.50 57.39 refraction 15 Aspheric -164.0116 0.3621 refraction 91.8017 16 Third lens E3e Aspheric -4.9125 2.9797 1.64 23.52 refraction -92.8392 17 Aspheric -117.3441 0.1000 refraction 25.2004 18 Spherical endless 0.1000 refraction 19 Image surface Spherical endless

[0094] Table 1

[0095] In this embodiment, the second side surface of the first lens, the second side surface of the second lens, and both side surfaces of the third lens are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0096]

[0097] Among them, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. The following Table 2 lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 that can be used for each aspherical mirror surface in this embodiment.

[0098] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 A22 6 -1.2777E+00 5.1712E-01 1.9263E-01 1.8808E-01 1.2392E-01 7.7751E-02 4.0235E-02 1.6086E-02 4.8221E-03 5.4947E-04 15 -5.4110E+00 1.7016E+00 -4.2572E-01 6.8900E-02 4.2708E-02 -2.3655E-02 -1.7414E-03 5.2986E-03 0.0000E+00 0.0000E+00 16 -4.7653E+00 1.2653E+00 -2.0702E-01 -3.4123E-03 4.3109E-02 -1.0068E-02 -4.9022E-03 4.9080E-03 0.0000E+00 0.0000E+00 17 1.3846E+01 9.7664E+00 -6.1694E+00 -1.0487E+01 -1.4195E+01 -1.4485E+01 -1.2848E+01 -8.1786E+00 -3.5462E+00 -7.7854E-01

[0099] Table 2

[0100] Figure 5 The MTF curve of the first optical system of the first embodiment is shown. The on-axis MTF value is relatively high. The first optical system provided in the first embodiment can achieve good imaging quality.

[0101] Embodiment 2

[0102] like Figure 6 and Figure 7 As shown, the first optical system of the second embodiment of the present application is described.

[0103] like Figure 6As shown, the first optical system includes the aperture STOe, the first element group, the second element group and the third element group of the first optical system from the first side to the second side, the first element group includes the first polarizer LP1, the reflective polarizer RP, the first 1 / 4 wave plate QWP1 and the first lens E1e from the first side to the second side along the first optical axis, the second element group includes the second 1 / 4 wave plate QWP2, the second polarizer LP2, the third 1 / 4 wave plate QWP3 and the second lens E2e from the first side to the second side along the first optical axis, and the third element group includes the third lens E3e. Among them, the first polarizer LP1, the reflective polarizer RP, and the first 1 / 4 wave plate QWP1 are attached together from the first side to the second side, the second side of the first 1 / 4 wave plate QWP1 is attached to the first side of the first lens E1e, and the first side of the first lens E1e is a plane. The second side of the first lens E1e is attached with a partial reflection layer, so that when the light is incident on the partial reflection layer, it is reflected and the propagation direction is changed.

[0104] In this embodiment, the first side refers to the human eye side, and the second side refers to the display side.

[0105] Table 3 shows the basic structural parameter table of the first optical system of Example 2, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all in millimeters (mm). In Table 3, the arrangement order of the serial numbers is the order in which the light passes, and the refraction / reflection is the refraction or reflection effect of the surface on the light during this passage.

[0106]

[0107]

[0108] Table 3

[0109] In this embodiment, the second side surface of the first lens, the second side surface of the second lens, and both side surfaces of the third lens are aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, formula (1) in Embodiment 1.

[0110] Table 4 below lists the higher-order coefficients that can be used for each aspherical mirror surface in this embodiment.

[0111] Face number A4 A6 A8 A10 A12 A14 A16 6 2.5378E-01 4.1201E-02 9.2194E-03 -1.8067E-03 -1.5264E-03 -5.8470E-04 1.5368E-05 15 3.7002E-01 -6.6219E-01 3.2166E-01 -7.4297E-02 1.0546E-02 0.0000E+00 0.0000E+00 16 6.0414E+00 -6.2604E-01 4.5652E-01 -9.9246E-02 9.4371E-03 0.0000E+00 0.0000E+00 17 8.7129E-01 -7.4975E-02 5.6043E-03 -1.1326E-04 -1.6255E-06 0.0000E+00 0.0000E+00

[0112] Table 4

[0113] Figure 7 The MTF curve of the first optical system of the second embodiment is shown. The on-axis MTF value is relatively high. The first optical system provided in the second embodiment can achieve good imaging quality.

[0114] Embodiment 3

[0115] like Figure 8 and Fig. 9 As shown, the first optical system of the third embodiment of the present application is described.

[0116] like Figure 8 As shown, the first optical system includes the aperture STOe, the first element group, the second element group and the third element group of the first optical system from the first side to the second side, the first element group includes the first polarizer LP1, the reflective polarizer RP, the first 1 / 4 wave plate QWP1 and the first lens E1e from the first side to the second side along the first optical axis, the second element group includes the second 1 / 4 wave plate QWP2, the second polarizer LP2, the third 1 / 4 wave plate QWP3 and the second lens E2e from the first side to the second side along the first optical axis, and the third element group includes the third lens E3e. Among them, the first polarizer LP1, the reflective polarizer RP, and the first 1 / 4 wave plate QWP1 are attached together from the first side to the second side, the second side of the first 1 / 4 wave plate QWP1 is attached to the first side of the first lens E1e, and the first side of the first lens E1e is a plane. The second side of the first lens E1e is attached with a partial reflection layer, so that when the light is incident on the partial reflection layer, it is reflected and the propagation direction is changed.

[0117] In this embodiment, the first side refers to the human eye side, and the second side refers to the display side.

[0118] Table 5 shows a basic structural parameter table of the first optical system of Example 3, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all in millimeters (mm). In Table 5, the arrangement order of the serial numbers is the order in which the light passes, and the refraction / reflection is the refraction or reflection effect of the surface on the light during this passage.

[0119]

[0120]

[0121] Table 5

[0122] In this embodiment, the second side surface of the first lens, the second side surface of the second lens, and both side surfaces of the third lens are aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, formula (1) in Embodiment 1.

[0123] Table 6 below lists the high-order coefficients that can be used for each aspherical mirror surface in this embodiment.

[0124] Face number A4 A6 A8 A10 A12 A14 A16 6 1.5291E-01 1.3393E-02 3.1023E-03 -2.2375E-04 -7.3649E-05 -1.3183E-04 4.4646E-05 15 -5.2503E-07 1.4361E-09 -1.1837E-12 -1.2317E-16 0.0000E+00 0.0000E+00 0.0000E+00 16 9.1271E-08 3.8402E-10 3.1865E-12 -3.7206E-15 0.0000E+00 0.0000E+00 0.0000E+00 17 3.0366E-07 -9.4598E-10 -2.6688E-12 7.2251E-15 0.0000E+00 0.0000E+00 0.0000E+00

[0125] Table 6

[0126] Fig. 9The MTF curve of the first optical system of the third embodiment is shown. The on-axis MTF value is relatively high. The first optical system provided in the third embodiment can achieve good imaging quality.

[0127] Embodiment 4

[0128] like Fig.10 and Fig.11 As shown, the first optical system of the fourth embodiment of the present application is described.

[0129] like Fig.10 As shown, the first optical system includes the aperture STOe, the first element group, the second element group and the third element group of the first optical system from the first side to the second side, the first element group includes the first polarizer LP1, the reflective polarizer RP, the first 1 / 4 wave plate QWP1 and the first lens E1e from the first side to the second side along the first optical axis, the second element group includes the second 1 / 4 wave plate QWP2, the second polarizer LP2, the third 1 / 4 wave plate QWP3 and the second lens E2e from the first side to the second side along the first optical axis, and the third element group includes the third lens E3e. Among them, the first polarizer LP1, the reflective polarizer RP, and the first 1 / 4 wave plate QWP1 are attached together from the first side to the second side, the second side of the first 1 / 4 wave plate QWP1 is attached to the first side of the first lens E1e, and the first side of the first lens E1e is a plane. The second side of the first lens E1e is attached with a partial reflection layer, so that when the light is incident on the partial reflection layer, it is reflected and the propagation direction is changed.

[0130] In this embodiment, the first side refers to the human eye side, and the second side refers to the display side.

[0131] Table 7 shows a basic structural parameter table of the first optical system of Example 4, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all in millimeters (mm). In Table 7, the arrangement order of the serial numbers is the order in which the light passes, and the refraction / reflection is the refraction or reflection effect of the surface on the light during this passage.

[0132] Serial number Parts Surface type Radius of curvature thickness Refractive Index Abbe number Refraction / Reflection Cone coefficient Human eye side Spherical 1 Aperture STOe of the first optical system Spherical endless 12.0000 refraction 2 The first polarizer LP1 Spherical endless 0.1039 1.49 57.47 refraction 3 Reflective polarizing element RP Spherical endless 0.0939 1.49 57.47 refraction 4 The first 1 / 4 wave plate QWP1 Spherical endless 0.1837 1.49 57.47 refraction 5 First lens E1e Spherical endless 5.0000 1.54 55.71 refraction 6 Aspheric -48.2873 -5.0000 1.54 55.71 reflection -5.6255 7 Spherical endless -0.1837 1.49 57.47 refraction 8 Spherical endless 0.1837 1.49 57.47 reflection 9 First lens E1e Spherical endless 5.0000 1.54 55.71 refraction 10 Aspheric -48.2873 0.6228 refraction 11 Second 1 / 4 wave plate QWP2 Spherical endless 0.0700 1.49 57.47 refraction 12 Second polarizer LP2 Spherical endless 0.0800 1.49 57.47 refraction 13 The third 1 / 4 wave plate QWP3 Spherical endless 0.0800 1.49 57.47 refraction 14 Second lens E2e Spherical endless 5.0000 1.50 57.39 refraction 15 Aspheric -234.8541 0.2541 refraction 84.0519 16 Third lens E3e Aspheric 43.7847 4.9560 1.64 23.52 refraction 5.9371 17 Aspheric -194.8034 0.3000 refraction 113.3059 18 Spherical endless 0.0881 refraction 19 Image surface Spherical endless

[0133] Table 7

[0134] In this embodiment, the second side surface of the first lens, the second side surface of the second lens, and both side surfaces of the third lens are aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, formula (1) in Embodiment 1.

[0135] Table 8 below lists the higher-order coefficients that can be used for each aspherical mirror surface in this embodiment.

[0136] Face number A4 A6 A8 A10 A12 A14 A16 6 -2.0581E-01 5.9306E-02 -3.8419E-04 -2.2102E-03 -1.2146E-03 0.0000E+00 0.0000E+00 15 -3.3738E+00 6.7120E-01 -5.9410E-03 1.4445E-02 2.2938E-04 0.0000E+00 0.0000E+00 16 -4.9013E+00 1.0426E+00 1.2537E-01 -3.2259E-02 5.7944E-03 0.0000E+00 0.0000E+00 17 -1.8591E+00 7.2362E-01 -1.2830E-01 6.7359E-02 -2.0430E-02 0.0000E+00 0.0000E+00

[0137] Table 8

[0138] Fig.11 The MTF curve of the first optical system of the fourth embodiment is shown. The on-axis MTF value is relatively high. The first optical system provided in the fourth embodiment can achieve good imaging quality.

[0139] In summary, in Examples 1 to 4, the light from the image plane sequentially passes through the second side surface of the third lens, the first side surface of the third lens, the second side surface of the second lens, and the first side surface of the second lens, and then is incident on the second side surface of the third 1 / 4 wave plate, the third 1 / 4 wave plate converts the light into a light of a first polarization state, the light of the first polarization state is incident on the second side surface of the second polarizer, the second polarizer converts the light of the first polarization state into a light of a second polarization state, the light of the second polarization state is incident on the second side surface of the second 1 / 4 wave plate, the second 1 / 4 wave plate converts the light of the second polarization state into a light of a third polarization state, the light of the third polarization state sequentially passes through the second side surface of the first lens and the first side surface of the first lens, and then is incident on the second side surface of the first 1 / 4 wave plate, the first 1 / 4 wave plate converts the light of the third polarization state into the light of the first polarization state. There are four polarized states of light, and the light of the fourth polarized state is incident on the second side of the reflective polarizing element and is reflected to form the first reflected light. The first reflected light passes through the first side and the second side of the first 1 / 4 wave plate to become the light of the fifth polarized state. The light of the fifth polarized state passes through the first side of the first lens and is incident on the partial reflection layer on the second side of the first lens, and is reflected by the partial reflection layer to become the second reflected light. The second reflected light passes through the first side of the first lens, the second side of the first 1 / 4 wave plate, and the first side of the first 1 / 4 wave plate in sequence to become the light of the sixth polarized state. The light of the sixth polarized state reaches the reflective polarizing element and is transmitted to the second side of the first polarizer. The light of the sixth polarized state is converted into the light of the seventh polarization state by the first polarizer and then emitted to the aperture STOe of the first optical system.

[0140] It should be noted that in the process of the light of the fourth polarization state being converted into the light of the sixth polarization state, it passes through the 1 / 4 wave plate twice, so that the polarization direction of the light of the fourth polarization state is perpendicular to the polarization direction of the light of the sixth polarization state. Therefore, the reflective polarizing element reflects the light of the fourth polarization state and transmits the light of the sixth polarization state.

[0141] Specific embodiments of the second optical system applicable to the above-mentioned embodiment will be further described below with reference to the accompanying drawings.

[0142] Embodiment 5

[0143] like Figures 12 to 16 As shown, the second optical system of the fifth embodiment of the present application is described.

[0144] like Fig.12As shown, the second optical system includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a stop STO of the second optical system, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

[0145] like Fig.12 As shown, the first lens has negative optical power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave, the second lens has negative optical power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave, the third lens has positive optical power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex, the fourth lens has positive optical power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex, the fifth lens has negative optical power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is concave, the sixth lens has positive optical power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave.

[0146] Table 9 shows a basic structural parameter table of the second optical system of this embodiment, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0147]

[0148]

[0149] Table 9

[0150] Table 9 also gives the object side surface S13 of the filter, the image side surface S14 of the filter, and the imaging surface S15.

[0151] In this embodiment, the second lens to the sixth lens are all aspherical lenses, and the surface shape of each aspherical lens can be defined by, but not limited to, the formula (1) in the first embodiment.

[0152] Table 10 below lists the higher-order coefficients that can be used for each aspherical mirror surface in this embodiment.

[0153] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 -5.2636E-01 -6.3615E-02 -1.2016E-02 -8.8952E-03 -1.2317E-03 -1.0240E-03 -6.0884E-04 -1.8947E-04 1.0912E-04 S4 -8.7657E-02 -3.7037E-02 -5.4909E-03 -2.5078E-03 6.5975E-04 9.0654E-05 -3.5530E-04 -3.6488E-04 -4.2937E-05 S5 -9.7449E-02 -4.4785E-03 -7.0732E-04 -2.9211E-04 -4.2273E-05 5.3071E-05 9.8585E-05 7.6994E-05 1.8421E-05 S6 -3.9849E-02 4.5758E-03 -2.9395E-04 8.7568E-05 -6.9887E-06 7.5301E-06 1.7239E-05 6.6801E-06 4.8029E-06 S7 -5.9573E-02 5.3866E-03 -3.0770E-04 2.2221E-04 -2.4123E-05 -9.8905E-06 -1.6652E-05 -1.8765E-06 -4.7602E-07 S8 -2.6716E-03 3.3145E-04 2.6037E-03 -8.5518E-04 5.7245E-04 -1.6087E-04 7.2824E-05 -2.3098E-05 3.5094E-06 S9 -6.3203E-03 5.2658E-03 3.4355E-03 -4.1925E-04 9.5051E-04 -1.7756E-04 1.0113E-04 -3.0206E-05 1.3760E-05 S10 -5.2552E-02 1.0525E-02 -1.8485E-03 -1.2606E-04 3.2682E-04 -3.1576E-05 4.7457E-05 -5.0541E-06 7.6445E-06 S11 -3.4906E-01 -6.3341E-03 -8.0388E-03 -1.8682E-03 -2.4818E-04 -1.9573E-04 -8.9160E-05 -7.0481E-05 -2.7990E-05 S12 -1.8665E-01 -1.0024E-02 4.4926E-04 -1.6774E-03 7.4059E-05 -3.8193E-05 -6.9300E-06 1.7868E-05 -4.6846E-06

[0154] Table 10

[0155] Fig.13 The axial chromatic aberration curve of the second optical system of the fifth embodiment is shown, which indicates that the convergence point of light of different wavelengths deviates after passing through the second optical system. Fig.14 The astigmatism curve of the second optical system of Example 5 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.15 The distortion curve of the second optical system of the fifth embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.16 The magnification chromatic aberration curve of the second optical system of the fifth embodiment is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the second optical system.

[0156] according to Figures 13 to 16 It can be seen that the second optical system provided in the fifth embodiment can achieve good imaging quality.

[0157] Embodiment 6

[0158] like Figures 17 to 21 As shown, the second optical system of embodiment 6 of the present application is described.

[0159] like Fig.17 As shown, the second optical system includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a stop STO of the second optical system, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

[0160] like Fig.17 As shown, the first lens has negative optical power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave, the second lens has negative optical power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave, the third lens has positive optical power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex, the fourth lens has positive optical power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex, the fifth lens has negative optical power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is concave, the sixth lens has positive optical power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave.

[0161] Table 11 shows a basic structural parameter table of the second optical system of this embodiment, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0162] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless S1 Spherical 3.7467 1.0406 1.776 49.6 S2 Spherical 1.3731 0.3733 S3 Aspheric 1.0314 0.2622 1.547 56.0 -0.4237 S4 Aspheric 0.5916 0.8037 -0.9852 S5 Aspheric 11.7016 1.1569 1.669 20.4 0.0054 S6 Aspheric -27.7455 0.1614 -2.3746 STO Spherical endless 0.0283 S7 Aspheric 0.9096 0.7433 1.547 56.0 -0.2883 S8 Aspheric -1.1207 0.0260 -1.0232 S9 Aspheric -1.7484 0.3780 1.669 20.4 3.0674 S10 Aspheric 2.6201 0.1828 0.3793 S11 Aspheric 1.2593 0.7432 1.547 56.0 0.4752 S12 Aspheric 2.7444 0.6279 4.2648 S13 Spherical endless 0.1018 1.519 64.2 S14 Spherical endless 0.2285 S15 Spherical endless

[0163] Table 11

[0164] Table 11 also gives the object side surface S13 of the filter, the image side surface S14 of the filter, and the imaging surface S15.

[0165] In this embodiment, the second lens to the sixth lens are all aspherical lenses, and the surface shape of each aspherical lens can be defined by, but not limited to, the formula (1) in the first embodiment.

[0166] Table 12 below lists the high-order coefficients that can be used for each aspherical mirror surface in this embodiment.

[0167]

[0168]

[0169] Table 12

[0170] Fig.18 The axial chromatic aberration curve of the second optical system of Example 6 is shown, which indicates that the convergence point of light of different wavelengths deviates after passing through the second optical system. Fig.19 The astigmatism curve of the second optical system of Example 6 is shown, which represents the meridional field curvature and the sagittal field curvature. Fig. 20 The distortion curve of the second optical system of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.21 The magnification chromatic aberration curve of the second optical system of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the second optical system.

[0171] according to Figures 18 to 21 It can be seen that the second optical system provided in Example 6 can achieve good imaging quality.

[0172] Embodiment 7

[0173] like Figure 22 to Figure 26 As shown, the second optical system of embodiment 7 of the present application is described.

[0174] like Fig. 22 As shown, the second optical system includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a stop STO of the second optical system, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

[0175] like Fig. 22 As shown, the first lens has negative optical power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave, the second lens has negative optical power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave, the third lens has positive optical power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex, the fourth lens has positive optical power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex, the fifth lens has negative optical power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is concave, the sixth lens has positive optical power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is convex.

[0176] Table 13 shows a basic structural parameter table of the second optical system of this embodiment, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0177] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless S1 Spherical 10.4326 0.6969 1.776 49.6 S2 Spherical 4.0967 0.1155 S3 Aspheric 2.6553 0.6430 1.538 55.6 -0.7720 S4 Aspheric 0.9456 1.6894 -1.5109 S5 Aspheric -3.4578 1.2718 1.646 23.5 0.0000 S6 Aspheric -1.8499 0.5266 0.0000 STO Spherical endless -0.1496 S7 Aspheric 3.3867 0.8682 1.547 56.0 10.0037 S8 Aspheric -1.4548 0.0590 -3.2737 S9 Aspheric -18.6182 0.3524 1.679 19.2 0.0000 S10 Aspheric 1.2912 0.0693 -13.1027 S11 Aspheric 2.4814 0.5439 1.547 56.0 -12.1510 S12 Aspheric -3.5188 0.3179 -18.4037 S13 Spherical endless 0.1270 1.519 64.2 S14 Spherical endless 1.3135 S15 Spherical endless

[0178] Table 13

[0179] Table 13 also gives the object side surface S13 of the filter, the image side surface S14 of the filter, and the imaging surface S15.

[0180] In this embodiment, the second lens to the sixth lens are all aspherical lenses, and the surface shape of each aspherical lens can be defined by, but not limited to, the formula (1) in the first embodiment.

[0181] Table 14 below lists the high-order coefficients that can be used for each aspherical mirror surface in this embodiment.

[0182] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 -3.5301E-01 1.5605E-02 2.2408E-03 3.8059E-04 -1.4032E-05 4.0469E-05 1.7288E-04 -1.6154E-04 5.4739E-05 S4 3.8921E-01 1.2884E-02 -9.5521E-04 -2.7080E-03 -1.1667E-03 -7.2116E-04 -1.0534E-04 1.1026E-05 6.6047E-05 S5 -6.4868E-02 -7.2839E-03 -6.5307E-04 4.4815E-04 2.2809E-04 8.4959E-05 9.5552E-06 -2.3545E-05 -2.7724E-05 S6 8.0412E-02 -3.2363E-03 1.3960E-03 1.3868E-04 5.6780E-05 4.7601E-05 -5.6584E-06 1.5146E-05 -9.7727E-06 S7 1.9493E-02 -1.0548E-02 -4.1079E-04 -3.8799E-04 -3.3548E-05 -2.6727E-05 3.0917E-06 -4.6136E-06 -9.6570E-06 S8 1.2550E-02 -3.3824E-03 8.4940E-05 7.3630E-04 -4.8417E-04 3.0217E-04 -1.3229E-04 2.8022E-05 -3.7685E-05 S9 -7.0854E-02 7.8606E-03 -3.1931E-03 1.4910E-03 -9.1340E-04 3.6633E-04 -1.3033E-04 2.5966E-05 -3.8339E-05 S10 1.0727E-01 -1.6105E-02 -1.7907E-03 2.1461E-04 -1.1118E-03 1.7344E-04 4.6820E-05 8.1792E-06 -1.0509E-07 S11 9.8997E-02 1.9210E-03 -3.1034E-03 1.6390E-03 -1.2066E-03 1.8617E-05 5.5010E-05 8.3535E-06 -3.6376E-07 S12 5.3091E-02 2.5558E-02 5.3597E-03 5.7740E-04 -4.3086E-04 -5.0311E-04 -2.0218E-04 -3.1719E-05 3.8154E-05

[0183] Table 14

[0184] Fig.23 The axial chromatic aberration curve of the second optical system of Example 7 is shown, which indicates that the convergence point of light of different wavelengths after passing through the second optical system deviates. Fig.24 The astigmatism curve of the second optical system of Example 7 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.25 The distortion curve of the second optical system of the seventh embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.26 The magnification chromatic aberration curve of the second optical system of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the second optical system.

[0185] according to Figure 23 to Figure 26 It can be seen that the second optical system provided in the seventh embodiment can achieve good imaging quality.

[0186] Embodiment 8

[0187] like Figures 27 to 31 As shown, the second optical system of Example 8 of the present application is described.

[0188] like Fig. 27 As shown, the second optical system includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a stop STO of the second optical system, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

[0189] like Fig. 27As shown, the first lens has negative optical power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave, the second lens has negative optical power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave, the third lens has positive optical power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex, the fourth lens has positive optical power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex, the fifth lens has negative optical power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is concave, the sixth lens has positive optical power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave.

[0190] Table 15 shows a basic structural parameter table of the second optical system of this embodiment, wherein the units of the curvature radius, thickness / distance, and effective focal length are all millimeters (mm).

[0191] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless S1 Spherical 7.1400 0.8189 1.776 49.6 S2 Spherical 1.7903 0.2896 S3 Aspheric 1.1332 0.3248 1.547 56.0 -0.4208 S4 Aspheric 0.6404 0.8467 -0.9796 S5 Aspheric 10.3147 1.6393 1.669 20.4 0.0054 S6 Aspheric -61.1487 0.2267 -2.3746 STO Spherical endless 0.0102 S7 Aspheric 1.0036 0.9950 1.547 56.0 -0.3404 S8 Aspheric -1.2175 0.0306 -0.9794 S9 Aspheric -1.9027 0.2948 1.669 20.4 2.9172 S10 Aspheric 2.5012 0.1746 -0.3346 S11 Aspheric 1.2857 0.8496 1.547 56.0 0.4438 S12 Aspheric 2.9207 0.6886 4.2676 S13 Spherical endless 0.1122 1.519 64.2 S14 Spherical endless 0.2248 S15 Spherical endless

[0192] Table 15

[0193] Table 15 also gives the object side surface S13 of the filter, the image side surface S14 of the filter, and the imaging surface S15.

[0194] In this embodiment, the second lens to the sixth lens are all aspherical lenses, and the surface shape of each aspherical lens can be defined by, but not limited to, the formula (1) in the first embodiment.

[0195] Table 16 below lists the higher-order coefficients that can be used for each aspherical mirror surface in this embodiment.

[0196] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 -5.9479E-01 -7.0007E-02 -5.7395E-03 -7.7003E-03 -1.7706E-03 -1.2916E-03 -4.9643E-04 -2.2264E-04 -1.4551E-04 S4 -9.4181E-02 -4.0031E-02 -4.2810E-03 -4.1497E-03 -4.7659E-04 1.3958E-05 2.9799E-04 1.7484E-04 4.2388E-05 S5 -9.8972E-02 -5.6078E-03 -8.5687E-04 -4.7675E-05 4.0519E-05 1.2264E-04 3.0372E-05 2.2959E-05 8.5937E-06 S6 -4.1414E-02 4.5313E-03 -4.1123E-04 7.4613E-05 -1.6978E-05 -1.3500E-06 4.1775E-06 -2.9873E-06 9.2823E-07 S7 -6.5885E-02 5.2429E-03 -4.1061E-04 2.0265E-04 -1.8147E-06 -7.2061E-06 -2.4523E-06 4.4830E-06 5.4022E-06 S8 -3.0680E-03 8.5521E-04 2.5060E-03 -9.3193E-04 4.2602E-04 -1.1428E-04 8.0439E-05 -1.0007E-05 4.6459E-07 S9 -6.3780E-03 6.6108E-03 3.7924E-03 -7.0344E-04 9.3310E-04 -2.4606E-05 1.1496E-04 -4.9639E-05 -1.0025E-05 S10 -5.7819E-02 1.0499E-02 -9.4570E-04 1.0366E-04 3.5453E-04 1.8048E-05 7.3740E-05 3.9213E-06 9.2396E-06 S11 -3.4893E-01 -1.1516E-02 -9.0915E-03 -1.3253E-03 -6.2064E-04 -2.9107E-04 -1.1328E-04 -6.8819E-05 -1.7037E-05 S12 -2.0941E-01 -1.8258E-02 2.3786E-04 -7.2305E-04 1.9681E-04 -1.1054E-04 -1.4399E-05 -3.8817E-05 -3.4714E-05

[0197] Table 16

[0198] Fig.28 The axial chromatic aberration curve of the second optical system of Example 8 is shown, which indicates that the convergence point of light of different wavelengths deviates after passing through the second optical system. Fig.29 The astigmatism curve of the second optical system of Example 8 is shown, which represents the meridional field curvature and the sagittal field curvature. Fig.30 The distortion curve of the second optical system of Example 8 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.31 The magnification chromatic aberration curve of the second optical system of Example 8 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the second optical system.

[0199] according to Figure 28 to Figure 31 It can be seen that the second optical system provided in Example 8 can achieve good imaging quality.

[0200] In summary, the visual optical system of the present application includes a first optical system and a second optical system. The first optical system has the above-mentioned embodiments 1 to 4, and the second optical system has the above-mentioned embodiments 5 to 8. There are a total of 4*4=16 combinations. The following Table 17 is the conditional formula values ​​for the 16 combinations, wherein 1-5 represent the combination of embodiment 1 and embodiment 5, 2-6 represent the combination of embodiment 2 and embodiment 6, and so on.

[0201] Conditional / Example Combination One to Five One to Six One to Seven One to Eight Two to Five Two to six Two to Seven Two to Eight Fe / Fp 14.90 16.37 14.72 16.72 11.18 12.28 11.05 12.55 ∑CTe / Fe 0.82 0.82 0.82 0.82 1.09 1.09 1.09 1.09 ∑CTp / Fp 3.64 3.87 3.52 4.50 3.64 3.87 3.52 4.50 (TDe*DTL1) / (TDp*DT11p) 18.74 17.89 11.12 14.31 18.88 18.02 11.20 14.42 DTemax / DTpmax 7.28 6.97 4.91 6.14 7.30 6.99 4.92 6.16 EPDe / EPDp 7.17 7.88 5.79 8.05 7.23 7.95 5.84 8.13 DTemx / Fe 0.96 0.96 0.96 0.96 1.29 1.29 1.29 1.29 Fe / SLR 1.52 1.52 1.52 1.52 1.14 1.14 1.14 1.14 FG1e / f23e -1.72 -1.72 -1.72 -1.72 0.39 0.39 0.39 0.39 FG1e / f2e 0.04 0.04 0.04 0.04 0.60 0.60 0.60 0.60 FG1e / f3e -1.77 -1.77 -1.77 -1.77 -0.18 -0.18 -0.18 -0.18 FG1e / (CTL1+CTR+CTQ1+CT1e) 2.64 2.64 2.64 2.64 2.63 2.63 2.63 2.63 |f3e| / (R5e+R6e) -0.07 -0.07 -0.07 -0.07 -1.77 -1.77 -1.77 -1.77 (NQ2*CTQ2+NL2*CTL2+NQ3*CTQ3+N2e*CT2e) / FG2e 0.03 0.03 0.03 0.03 0.46 0.46 0.46 0.46 TDp / Fp 4.79 5.28 5.38 5.95 4.79 5.28 5.38 5.95 TDp / TAN(Semi-FOVp) 3.14 2.43 1.40 1.10 3.14 2.43 1.40 1.10 (f1p+f2p) / Fp -5.52 -5.97 -9.88 -6.23 -5.52 -5.97 -9.88 -6.23 |f4p+f5p| / Fp 0.34 0.41 0.18 0.35 0.34 0.41 0.18 0.35 f3p / (R5p+R6p) -0.25 -0.78 -0.89 -0.26 -0.25 -0.78 -0.89 -0.26 f6p / Fp 2.92 3.24 2.21 3.25 2.92 3.24 2.21 3.25 Conditional / Example Combination Three-Five Three-six Three-seven Three to Eight Four-Five Four-six Four-Seven Four to Eight Fe / Fp 10.97 12.05 10.84 12.31 10.92 12.00 10.80 12.26 ∑CTe / Fe 1.11 1.11 1.11 1.11 1.12 1.12 1.12 1.12 ∑CTp / Fp 3.64 3.87 3.52 4.50 3.64 3.87 3.52 4.50 (TDe*DTL1) / (TDp*DT11p) 18.77 17.91 11.13 14.33 18.78 17.93 11.14 14.34 DTemax / DTpmax 7.30 6.98 4.92 6.16 7.30 6.99 4.92 6.16 EPDe / EPDp 7.23 7.95 5.84 8.13 7.23 7.95 5.84 8.13 DTemx / Fe 1.31 1.31 1.31 1.31 1.32 1.32 1.32 1.32 Fe / SLR 1.12 1.12 1.12 1.12 1.12 1.12 1.12 1.12 FG1e / f23e 0.49 0.49 0.49 0.49 0.29 0.29 0.29 0.29 FG1e / f2e 0.32 0.32 0.32 0.32 0.03 0.03 0.03 0.03 FG1e / f3e 0.19 0.19 0.19 0.19 0.26 0.26 0.26 0.26 FG1e / (CTL1+CTR+CTQ1+CT1e) 2.62 2.62 2.62 2.62 2.66 2.66 2.66 2.66 |f3e| / (R5e+R6e) -0.66 -0.66 -0.66 -0.66 -0.37 -0.37 -0.37 -0.37 (NQ2*CTQ2+NL2*CTL2+NQ3*CTQ3+N2e*CT2e) / FG2e 0.24 0.24 0.24 0.24 0.02 0.02 0.02 0.02 TDp / Fp 4.79 5.28 5.38 5.95 4.79 5.28 5.38 5.95 TDp / TAN(Semi-FOVp) 3.14 2.43 1.40 1.10 3.14 2.43 1.40 1.10 (f1p+f2p) / Fp -5.52 -5.97 -9.88 -6.23 -5.52 -5.97 -9.88 -6.23 |f4p+f5p| / Fp 0.34 0.41 0.18 0.35 0.34 0.41 0.18 0.35 f3p / (R5p+R6p) -0.25 -0.78 -0.89 -0.26 -0.25 -0.78 -0.89 -0.26 f6p / Fp 2.92 3.24 2.21 3.25 2.92 3.24 2.21 3.25

[0202] Tables 17 and 18 give some optical parameters of the first optical system of Examples 1 to 4.

[0203] Basic data / Example 1 2 3 4 Fe(mm) 18.28 13.72 13.46 13.41 f1e(mm) 89.53 89.19 88.53 90.00 f2e(mm) 331.27 23.72 44.50 474.36 f3e(mm) -8.04 -76.87 73.70 55.97 FOVe(°) 100.0 100.0 100.0 100.0

[0204] Table 18

[0205] Table 19 gives some optical parameters of the second optical system of Examples 5 to 8.

[0206] Basic data / Example 5 6 7 8 Fp(mm) 1.23 1.12 1.24 1.09 f1p(mm) -3.37 -3.45 -9.13 -3.30 f2p(mm) -3.41 -3.22 -3.14 -3.51 f3p(mm) 12.18 12.45 4.70 13.32 f4p(mm) 1.08 1.05 1.99 1.20 f5p(mm) -1.50 -1.52 -1.77 -1.57 f6p(mm) 3.58 3.62 2.75 3.55 FOVp(°) 123.9 135.2 156.3 160.8

[0207] Table 19

[0208] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0209] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0210] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0211] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A visual optical system, characterized in that: The visual optical system includes a first optical system and a second optical system. The first optical system includes a first element group, a second element group and a third element group in sequence from the first side to the second side along the first optical axis, the first element group includes a first polarizer, a reflective polarizing element, a first quarter wave plate and a first lens in sequence from the first side to the second side along the first optical axis, the second element group includes a second quarter wave plate, a second polarizer, a third quarter wave plate and a second lens in sequence from the first side to the second side along the first optical axis, and the third element group includes a third lens; The second optical system includes, in order from the object side to the image side along the second optical axis, a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power and a sixth lens with positive optical power; Wherein, the effective focal length Fe of the first optical system and the effective focal length Fp of the second optical system satisfy: 10 <Fe / Fp<17; The sum of the center thicknesses ΣCTe of the first lens, the second lens and the third lens and the effective focal length Fe of the first optical system satisfy the following: 0.8≤ΣCTe / Fe<1.2; A total of the center thicknesses ΣCTp of the first lens to the sixth lens and an effective focal length Fp of the second optical system satisfy the following relationship: 3.0<ΣCTp / Fp<5.

0.

2. The visual optical system according to claim 1, characterized in that: The distance TDe from the first side surface of the first polarizer to the second side surface of the third lens on the first optical axis, the maximum radius DTL1 of the first polarizer, the distance TDp from the object side surface of the first lens to the image side surface of the sixth lens on the second optical axis, and the maximum effective radius DT11p of the object side surface of the first lens satisfy the following: 11<(TDe*DTL1) / (TDp*DT11p)<20.

3. The visual optical system according to claim 1, characterized in that: The maximum radius DTemax in the first element group, the second element group and the third element group, and the maximum radius DTpmax in the first lens to the sixth lens satisfy: 4.5 <DTemax / DTpmax<7.5。 4. The visual optical system according to claim 1, characterized in that: The entrance pupil diameter EPDe of the first optical system and the entrance pupil diameter EPDp of the second optical system satisfy: 5.5 <EPDe / EPDp<8.5。 5. The visual optical system according to claim 1, characterized in that: The maximum radius DTemax in the first element group, the second element group and the third element group and the effective focal length Fe of the first optical system satisfy: 0.9 <DTemax / Fe<1.5。 6. The visual optical system according to claim 1, characterized in that: The effective focal length Fe of the first optical system and the distance SLR from the aperture of the first optical system to the first polarizer on the first optical axis satisfy: 1.0 <Fe / SLR≤1.5。 7. The visual optical system according to claim 1, characterized in that: The effective focal length FG1e of the first element group and the combined focal length f23e of the second lens and the third lens satisfy: -2.0 <FG1e / f23e<1.0。 8. The visual optical system according to claim 1, characterized in that: The effective focal length FG1e of the first element group and the effective focal length f2e of the second lens satisfy: 0 < FG1e / f2e < 1.

0. The effective focal length FG1e of the first element group and the effective focal length f3e of the third lens satisfy: -2.0 < FG1e / f3e < 0.

5.

9. The visual optical system according to claim 1, characterized in that: The effective focal length FG1e of the first element group, the central thickness CTL1 of the first polarizer, the central thickness CTR of the reflective polarizing element, the central thickness CTQ1 of the first quarter-wave plate, and the central thickness CT1e of the first lens satisfy: 2.0 < FG1e / (CTL1 + CTR + CTQ1 + CT1e) < 3.

0.

10. The visual optical system according to claim 1, characterized in that: The effective focal length f3e of the third lens, the curvature radius R5e of the first side surface of the third lens, and the curvature radius R6e of the second side surface of the third lens satisfy: -2.0 < |f3e| / (R5e + R6e) < 0.

11. The visual optical system according to any one of claims 1 to 10, characterized in that: The refractive index NQ2 of the second quarter-wave plate, the central thickness CTQ2 of the second quarter-wave plate, the refractive index NL2 of the second polarizer, the central thickness CTL2 of the second polarizer, the refractive index NQ3 of the third quarter-wave plate, the central thickness CTQ3 of the third quarter-wave plate, the refractive index N2e of the second lens, the central thickness CT2e of the second lens, and the effective focal length FG2e of the second element group satisfy: 0 < (NQ2*CTQ2 + NL2*CTL2 + NQ3*CTQ3 + N2e*CT2e) / FG2e ≤ 0.

5.

12. The visual optical system according to any one of claims 1 to 10, characterized in that: The distance TDp on the second optical axis from the object side surface of the first lens to the image side surface of the sixth lens and the effective focal length Fp of the second optical system satisfy: 4.5 < TDp / Fp ≤ 6.

0.

13. The visual optical system according to any one of claims 1 to 10, characterized in that: The distance TDp on the second optical axis from the object side surface of the first lens to the image side surface of the sixth lens and the maximum half field of view angle Semi-FOVp of the second optical system satisfy: 1.0 < TDp / TAN(Semi-FOVp) < 3.

5.

14. The visual optical system according to any one of claims 1 to 10, characterized in that: The effective focal length f1p of the first lens, the effective focal length f2p of the second lens, and the effective focal length Fp of the second optical system satisfy: -10 < (f1p + f2p) / Fp < -5.

0.

15. The visual optical system according to any one of claims 1 to 10, characterized in that: The effective focal length f4p of the fourth lens, the effective focal length f5p of the fifth lens, and the effective focal length Fp of the second optical system satisfy: 0 < |f4p + f5p| / Fp < 0.

5.

16. The visual optical system according to any one of claims 1 to 10, characterized in that: The effective focal length f3p of the third lens, the curvature radius R5p of the object side surface of the third lens, and the curvature radius R6p of the image side surface of the third lens satisfy: -1.0 < f3p / (R5p + R6p) < 0.

17. The visual optical system according to any one of claims 1 to 10, characterized in that: The effective focal length f6p of the sixth lens and the effective focal length Fp of the second optical system satisfy: 2.0 < f6p / Fp < 3.5.

Images