VR visual system

Abstract

The utility model provides a VR visual system, the VR visual system comprises an element group and a lens cone group, the element group sequentially comprises a first element group and a second element group from a first side to a second side along the optical axis of the VR visual system, the second element group can move along the direction of the optical axis, the combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens and the inner diameter dam of the second side surface of the first lens barrel meet the condition that fz1 / dam is more than or equal to 1.60 and less than or equal to 2.66; and the outer diameter Dbs of the first side surface of the second lens cone, the inner diameter dbs of the first side surface of the second lens cone and the distance delta L of the second element group moving along the optical axis when the diopter of the VR visual system is from + 2D to-5D meet the following condition: (Dbs-dbs) / delta L is greater than or equal to 2.63 and less than or equal to 7.45. The VR visual system solves the problem that a VR visual system in the prior art is large in diopter adjustment range and is difficult to consider the structural stability at the same time.

Description

Technical Field

[0001] This utility model relates to the field of head-mounted device technology, and more specifically, to a VR visual system. Background Technology

[0002] With the continuous development of virtual reality (VR) technology, providing users with a more personalized and comfortable visual experience has become an important research and development direction. Among these, refractive power adjustment technology, as one of the key technologies for improving the applicability and user experience of VR visual systems, is receiving increasing attention. Although VR visual systems on the market have made significant progress in visual experience, existing VR visual systems suffer from insufficient refractive power adjustment, especially for users with significant differences in vision, such as myopia or hyperopia, where existing VR visual systems often cannot provide a sufficient range of refractive power adjustment. Furthermore, the structural stability of VR visual systems is not high when adjusting refractive power, leading to assembly errors and resulting in some users not obtaining a clear visual experience. Therefore, how to adjust the size and optical parameters of the lens barrel and optical elements of the VR visual system to meet a large range of refractive power adjustment while maintaining assembly stability is a crucial issue. Utility Model Content

[0003] The main objective of this invention is to provide a VR visual system to solve the problem that existing VR visual systems have a large diopter adjustment range and are difficult to balance in terms of structural stability.

[0004] To achieve the above objectives, according to one aspect of the present invention, a VR visual system is provided. The VR visual system includes: an element group, which sequentially comprises a first element group and a second element group along the optical axis of the VR visual system from a first side to a second side. The second element group is movable along the optical axis. The first element group, along the optical axis from the first side to the second side, includes at least a reflective polarizing element, a first quarter-wave plate, and a first lens. The first lens has positive optical power, a first side surface of the first lens is planar, and a second side surface of the first lens is convex. The second element group, along the optical axis from the first side to the second side, includes at least a second lens, a second quarter-wave plate, a polarizer, and a display. The second lens has positive optical power. The first side of the mirror is convex, and the second side of the second lens is flat. The lens barrel assembly includes a first lens barrel and a second lens barrel. The first element group is housed in the first lens barrel, and the second element group is housed in the second lens barrel. The combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate, and the first lens, and the inner diameter dam of the second side of the first lens barrel satisfy the following: 1.60≤fz1 / dam≤2.66. The outer diameter Dbs of the first side of the second lens barrel, the inner diameter dbs of the first side of the second lens barrel, and the distance ΔL that the second element group moves along the optical axis when the refractive power of the VR visual system changes from +2D to -5D satisfy the following: 2.63≤(Dbs-dbs) / ΔL≤7.45.

[0005] According to another aspect of the present invention, a VR visual system is provided, comprising: an element group, the element group including a first element group and a second element group sequentially from a first side to a second side along the optical axis of the VR visual system, the second element group being movable along the direction of the optical axis; the first element group including at least a reflective polarizing element, a first quarter-wave plate, and a first lens along the optical axis from the first side to the second side, the first lens having positive optical power, a first side surface of the first lens being planar, and a second side surface of the first lens being convex; the second element group including at least a second lens, a second quarter-wave plate, a polarizer, and a display along the optical axis from the first side to the second side, the second lens having positive optical power, and a first side surface of the second lens being convex. The second side surface of the second lens is a plane; the lens barrel assembly includes a first lens barrel and a second lens barrel, the first element group is housed in the first lens barrel, and the second element group is housed in the second lens barrel; wherein, the inner diameter dbs of the first side surface of the second lens barrel, the effective focal length f2 of the second lens, and the radius of curvature R3 of the first side surface of the second lens satisfy: 14.00mm≤dbs / (f2 / R3)≤20.65mm; the outer diameter Dbs of the first side surface of the second lens barrel, the inner diameter dbs of the first side surface of the second lens barrel, and the distance ΔL that the second element group moves along the optical axis when the refractive power of the VR visual system changes from +2D to -5D satisfy: 2.63≤(Dbs-dbs) / ΔL≤7.45.

[0006] Furthermore, the center thickness CTR of the reflective polarizing element on the optical axis, the center thickness CTQ1 of the first quarter-wave plate on the optical axis, the center thickness CT1 of the first lens on the optical axis, and the maximum thickness La from the first side surface of the first lens barrel to the second side surface of the first lens barrel along the optical axis satisfy the following: 1.00≤(CTR+CTQ1+CT1) / La≤1.29.

[0007] Furthermore, the inner diameter dbm of the second side of the second lens barrel, the center thickness CT2 of the second lens on the optical axis, the center thickness CTQ2 of the second quarter-wave plate on the optical axis, and the center thickness CTL of the polarizer on the optical axis satisfy the following condition: 2.20≤dbm / (CT2+CTQ2+CTL)≤5.22.

[0008] Furthermore, the maximum thickness Lb from the first side to the second side of the second lens tube along the optical axis and the change in effective focal length Δf of the VR visual system from +2D to -5D satisfy the following: 20.74≤Lb / Δf≤44.95.

[0009] Furthermore, the inner diameter dbs of the first side of the second lens barrel, the effective focal length f2 of the second lens, and the radius of curvature R3 of the first side of the second lens satisfy the following condition: 14.00mm≤dbs / (f2 / R3)≤20.65mm.

[0010] Furthermore, the radius of curvature R2 of the second side surface of the first lens and the outer diameter Dam of the second side surface of the first lens barrel satisfy the following condition: -1.37≤R2 / Dam≤-1.15.

[0011] Furthermore, the combined focal length fz2 of the second lens, the second quarter-wave plate, and the polarizer, and the outer diameter Dbm of the second side of the second lens barrel satisfy the following condition: 1.55≤fz2 / Dbm≤3.13.

[0012] Furthermore, the effective focal length change Δf of the VR visual system from +2D to -5D, the outer diameter Das of the first side of the first lens barrel, and the inner diameter Das of the first side of the first lens barrel satisfy the following condition: 0.15mm < Δf × (Das / das) < 0.45mm.

[0013] Furthermore, the effective focal length f1 of the first lens, the refractive index N1 of the first lens, and the inner diameter das of the first side of the first lens barrel satisfy the following condition: 0.98≤(f1 / N1) / das≤1.99.

[0014] Furthermore, the maximum thickness La from the first side to the second side of the first lens barrel along the optical axis and the entrance pupil diameter EPD of the VR visual system satisfy the following condition: 1.32≤La / EPD≤1.70.

[0015] Furthermore, the combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens, and the maximum thickness La of the first side surface to the second side surface of the first lens barrel along the optical axis satisfy the following: 11.43≤fz1 / La≤16.40.

[0016] Furthermore, the combined focal length fz2 of the second lens, the second quarter-wave plate, and the polarizer, and the maximum thickness Lb of the second lens barrel from the first side to the second side along the optical axis satisfy the following: 8.30≤fz2 / Lb≤18.91.

[0017] Furthermore, the outer diameter Dbs of the first side of the second lens tube, the outer diameter Dbm of the second side of the second lens tube, and the distance ΔL that the second element group moves along the optical axis when the refractive power of the VR visual system changes from +2D to -5D satisfy the following: 1.05mm < (Dbs / Dbm) × ΔL < 1.75mm.

[0018] Furthermore, the inner diameter dbm of the second side of the second lens barrel, the effective focal length f2 of the second lens, and the refractive index N2 of the second lens satisfy the following condition: 0.25 < dbm / (f2 / N2) < 0.95.

[0019] According to the technical solution of this utility model, the VR visual system includes an element group and a lens group. The element group, along the optical axis of the VR visual system from the first side to the second side, sequentially includes a first element group and a second element group. The second element group is movable along the optical axis. The first element group, along the optical axis from the first side to the second side, includes at least a reflective polarizing element, a first quarter-wave plate, and a first lens. The first lens has positive optical power, its first side surface is planar, and its second side surface is convex. The second element group, along the optical axis from the first side to the second side, includes at least a second lens, a second quarter-wave plate, a polarizer, and a display. The second lens has positive optical power, and its first side surface is convex. The second lens has a convex surface and a flat surface on its second side. The lens barrel assembly includes a first lens barrel and a second lens barrel, with the first element assembly housed within the first lens barrel and the second element assembly housed within the second lens barrel. The combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate, and the first lens, and the inner diameter dam of the second side of the first lens barrel satisfy the following: 1.60 ≤ fz1 / dam ≤ 2.66. The outer diameter Dbs of the first side of the second lens barrel, the inner diameter dbs of the first side of the second lens barrel, and the distance ΔL that the second element assembly moves along the optical axis when the refractive power of the VR visual system changes from +2D to -5D satisfy the following: 2.63 ≤ (Dbs - dbs) / ΔL ≤ 7.45.

[0020] The VR visual system of this application comprises a first element group including at least a reflective polarizing element, a first quarter-wave plate, and a first lens, and a second element group including a second lens, a second quarter-wave plate, a polarizer, and a display, arranged along the optical axis. The first element group and the second element group are respectively disposed within a first lens barrel and a second lens barrel, wherein the second lens barrel and the second element group as a whole are movable along the optical axis. By reasonably setting the combined focal length of the reflective polarizing element, the first quarter-wave plate, and the first lens, the inner and outer diameters of the first and second lens barrels, and the moving distance of the second element group, the refractive power of the VR visual system can be adjusted from +2D to -5D, while ensuring the stable installation of the first element group within the first lens barrel and the stable movement and adjustment of the second element group. This ensures sufficient movement space and avoids assembly errors caused by the movement of the second element group, thereby enhancing the overall stability and durability of the VR visual system. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic diagram of parameters of a VR visual system in a first state according to an optional embodiment of the present invention is shown;

[0023] Figure 2 It shows Figure 1 A schematic diagram of the parameters of the VR visual system in the second state;

[0024] Figures 3 to 4 The diagram shows a schematic representation of the VR visual system of Embodiment 1 of this utility model in a first state and a second state.

[0025] Figures 5 to 6 The diagram shows a schematic representation of the VR visual system of Embodiment 2 of this utility model in a first state and a second state.

[0026] Figures 7 to 8 The diagram shows a schematic representation of the VR visual system of Embodiment 3 of this invention in a first state and a second state.

[0027] Figures 9 to 10 The MTF curves of the VR visual system of Embodiment 1 of this utility model in the first state and the second state are shown respectively.

[0028] Figures 11 to 12 The diagram shows a schematic representation of the VR visual system of Embodiment 4 of this utility model in a first state and a second state.

[0029] Figures 13 to 14 The diagram shows a schematic representation of the VR visual system of Embodiment 5 of this invention in a first state and a second state.

[0030] Figures 15 to 16 The diagram shows a schematic representation of the VR visual system of Embodiment Six of this invention in a first state and a second state.

[0031] Figures 17 to 18 The MTF curves of the VR visual system of Embodiment 4 of this utility model in the first state and the second state are shown respectively.

[0032] Figures 19 to 20 The diagram shows a schematic representation of the VR visual system of Embodiment 7 of this invention in a first state and a second state.

[0033] Figures 21 to 22 The diagram shows a schematic diagram of the VR visual system of Embodiment 8 of this utility model in the first and second states.

[0034] Figures 23 to 24 The diagram shows a schematic representation of the VR visual system of Embodiment 9 of this invention in a first state and a second state.

[0035] Figures 25 to 26 The MTF curves of the VR visual system of Embodiment 7 of this utility model in the first state and the second state are shown respectively.

[0036] The above figures include the following reference numerals:

[0037] RP, reflective polarizing element; QWP1, first quarter-wave plate; E1, first lens; BS, partial reflective element; E2, second lens; QWP2, second quarter-wave plate; LP, polarizer; Pa, first lens barrel; Pb, second lens barrel; IMG, image plane. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0040] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0041] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0042] In the accompanying 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 illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0043] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine convexity or concavity. For the eye-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the display-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0044] To address the challenge of balancing a large diopter adjustment range with structural stability in existing VR visual systems, this invention provides a VR visual system.

[0045] First Implementation Method

[0046] like Figures 1 to 26As shown, the VR visual system includes a component group and a lens group. The component group, along the optical axis of the VR visual system from the first side to the second side, sequentially includes a first component group and a second component group. The second component group is movable along the optical axis. The first component group, along the optical axis from the first side to the second side, includes at least a reflective polarizing element, a first quarter-wave plate, and a first lens. The first lens has positive optical power, its first side surface is planar, and its second side surface is convex. The second component group, along the optical axis from the first side to the second side, includes at least a second lens, a second quarter-wave plate, a polarizer, and a display. The second lens has positive optical power, its first side surface is convex, and its second side surface is convex. The second side of the lens is a plane; the lens barrel assembly includes a first lens barrel and a second lens barrel, the first element group is housed in the first lens barrel, and the second element group is housed in the second lens barrel; wherein, the combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens, and the inner diameter dam of the second side of the first lens barrel satisfy: 1.60≤fz1 / dam≤2.66; the outer diameter Dbs of the first side of the second lens barrel, the inner diameter dbs of the first side of the second lens barrel, and the distance ΔL that the second element group moves along the optical axis when the refractive power of the VR visual system changes from +2D to -5D satisfy: 2.63≤(Dbs-dbs) / ΔL≤7.45.

[0047] The VR visual system of this application comprises a first element group including at least a reflective polarizing element, a first quarter-wave plate, and a first lens, and a second element group including a second lens, a second quarter-wave plate, a polarizer, and a display, arranged along the optical axis. The first element group and the second element group are respectively disposed within a first lens barrel and a second lens barrel, wherein the second lens barrel and the second element group as a whole are movable along the optical axis. By reasonably setting the combined focal length of the reflective polarizing element, the first quarter-wave plate, and the first lens, the inner and outer diameters of the first and second lens barrels, and the moving distance of the second element group, the refractive power of the VR visual system can be adjusted from +2D to -5D, while ensuring the stable installation of the first element group within the first lens barrel and the stable movement and adjustment of the second element group. This ensures sufficient movement space and avoids assembly errors caused by the movement of the second element group, thereby enhancing the overall stability and durability of the VR visual system.

[0048] VR visual systems are susceptible to factors such as manufacturing errors of components, assembly errors, and changes in the usage environment. Simulating yield rates can visually demonstrate the impact of these factors on the performance of VR visual systems, thereby predicting their actual performance. Table 1 below shows the simulated yield rates of VR visual systems in Schemes 1, 2, and 3 under different conditional values ​​for various fields of view. Table 1 describes the difference in yield data between the VR visual system's imaging in the sagittal plane (SAG) and meridional plane (TAN). 0F to 1.0F are normalized notations for the fields of view; for example, 0F represents the center field of view of the VR visual system, 0.5F represents half of the maximum field of view, and 1.0F represents the maximum field of view.

[0049] Table 1

[0050]

[0051] As shown in Scheme 2 and Scheme 3, the VR visual systems in Scheme 2 have fz1 / dam = 3.2 and (Dbs-dbs) / ΔL = 8.5, both of which exceed the upper limit of the conditional expression. In Scheme 3, fz1 / dam = 1.1 and (Dbs-dbs) / ΔL = 2.0 are both below the lower limit of the conditional expression. The VR visual systems corresponding to Scheme 2 and Scheme 3 have poor performance in all fields of view and very low simulation yield.

[0052] As shown in Scheme 1, the VR visual system has values ​​of fz1 / dam = 1.97 and (Dbs-dbs) / ΔL = 3.61 that are both within the range of the conditional formula. The VR visual system corresponding to Scheme 1 has good performance in all fields of view and a high simulation yield.

[0053] In this embodiment, the center thickness CTR of the reflective polarizing element along the optical axis, the center thickness CTQ1 of the first quarter-wave plate along the optical axis, the center thickness CT1 of the first lens along the optical axis, and the maximum thickness La from the first side surface to the second side surface of the first lens barrel along the optical axis satisfy the following condition: 1.00 ≤ (CTR + CTQ1 + CT1) / La ≤ 1.29. By limiting (CTR + CTQ1 + CT1) / La to a reasonable range, the relationship between the element thickness of the first element group and the housing size of the lens barrel can be optimized, further optimizing the structure of the VR visual system, reducing aberrations, improving resolution and contrast, and simultaneously achieving a compact design and lightweight design, which is beneficial for saving space and improving the portability of the VR visual system.

[0054] In this embodiment, the inner diameter (dbm) of the second side of the second lens barrel, the center thickness (CT2) of the second lens on the optical axis, the center thickness (CTQ2) of the second quarter-wave plate on the optical axis, and the center thickness (CTL) of the polarizer on the optical axis satisfy the following relationship: 2.20 ≤ dbm / (CT2 + CTQ2 + CTL) ≤ 5.22. By limiting dbm / (CT2 + CTQ2 + CTL) to a reasonable range, the relationship between the element thickness of the second element group and the inner diameter of the second side of the second lens barrel can be optimized, thereby optimizing the polarization performance of the second element group and ensuring that light maintains a good polarization state when passing through the second element group.

[0055] In this embodiment, the maximum thickness Lb of the second lens barrel from the first side to the second side along the optical axis, and the change in effective focal length Δf of the VR visual system's diopter from +2D to -5D, satisfy the following condition: 20.74 ≤ Lb / Δf ≤ 44.95. By limiting Lb / Δf within a reasonable range, the relationship between the accommodating size of the second lens barrel and the change in effective focal length Δf of the diopter from +2D to -5D can be optimized, ensuring stable image quality when adjusting the VR visual system's focal length. This is crucial for applications requiring high definition.

[0056] In this embodiment, the inner diameter dbs of the first side of the second lens barrel, the effective focal length f2 of the second lens, and the radius of curvature R3 of the first side of the second lens satisfy the following condition: 14.00mm ≤ dbs / (f2 / R3) ≤ 20.65mm. By limiting dbs / (f2 / R3) within a reasonable range, the structural stability of the second element group can be adjusted and enhanced, the imaging shift caused by changes in the external environment can be reduced, and the stability and durability of the VR visual system can be improved.

[0057] In this embodiment, the radius of curvature R2 of the second side surface of the first lens and the outer diameter Dam of the second side surface of the first lens barrel satisfy the following condition: -1.37 ≤ R2 / Dam ≤ -1.15. By limiting R2 / Dam within a reasonable range, the bearing stability between the first lens and the first lens barrel can be optimized, which helps to simplify the design and manufacturing process, while controlling the size of the first lens in the first component group, improving production efficiency and reducing costs.

[0058] In this embodiment, the combined focal length fz2 of the second lens, the second quarter-wave plate, and the polarizer, and the outer diameter Dbm of the second side of the second lens barrel satisfy the following condition: 1.55 ≤ fz2 / Dbm ≤ 3.13. By limiting fz2 / Dbm within a reasonable range, it is beneficial to reduce the size and weight of the VR visual system, improve portability and practicality, and at the same time ensure that the combined focal length of the second element group can be adjusted within a certain range to adapt to different observation needs.

[0059] In this embodiment, the effective focal length change Δf of the VR visual system from +2D to -5D, the outer diameter Das of the first side of the first lens barrel, and the inner diameter Das of the first side of the first lens barrel satisfy the following condition: 0.15mm < Δf × (Das / das) < 0.45mm. By limiting Δf × (Das / das) within a reasonable range, precise focal length adjustment can be achieved, making it suitable for applications requiring rapid and accurate adjustment of focal length, observation distance, or object size. Simultaneously, constraining Δf × (Das / das) improves the compatibility of the VR visual system and enhances the clarity of the imaging surface at different distances.

[0060] In this embodiment, the effective focal length f1 of the first lens, the refractive index N1 of the first lens, and the inner diameter das of the first side of the first lens barrel satisfy the following condition: 0.98 ≤ (f1 / N1) / das ≤ 1.99. By limiting (f1 / N1) / das to a reasonable range, it is helpful to design a more compact VR visual system, reduce the size and weight of the VR visual system, and improve portability and practicality.

[0061] In this embodiment, the maximum thickness La from the first side to the second side of the first lens barrel along the optical axis and the entrance pupil diameter EPD of the VR visual system satisfy the following condition: 1.32 ≤ La / EPD ≤ 1.70. By limiting La / EPD within a reasonable range, the relationship between the accommodating size of the first lens barrel and the entrance pupil diameter of the VR visual system can be optimized, further optimizing the light transmission path, reducing light loss, and improving the light transmission performance and clarity of the VR visual system.

[0062] In this embodiment, the combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate, and the first lens, and the maximum thickness La along the optical axis from the first side surface to the second side surface of the first lens barrel satisfy the following condition: 11.43 ≤ fz1 / La ≤ 16.40. By limiting fz1 / La to a reasonable range, and by adjusting the combined focal length of the reflective polarizing element, the first quarter-wave plate, and the first lens, as well as the accommodating size of the first lens barrel, different imaging distances and requirements can be accommodated, thereby improving the flexibility of the VR visual system.

[0063] In this embodiment, the combined focal length fz2 of the second lens, the second quarter-wave plate, and the polarizer, and the maximum thickness Lb of the second lens barrel from its first side to its second side along the optical axis satisfy the following condition: 8.30 ≤ fz2 / Lb ≤ 18.91. By limiting fz2 / Lb within a reasonable range, the relationship between the combined focal length of the second lens, the second quarter-wave plate, and the polarizer and the accommodating size of the second lens barrel can be optimized. Even under conditions such as vibration or temperature changes, the VR visual system can maintain imaging stability, while improving light utilization, reducing light loss, and enhancing the performance of the VR visual system.

[0064] In this embodiment, the outer diameter Dbs of the first side of the second lens barrel, the outer diameter Dbm of the second side of the second lens barrel, and the distance ΔL that the second element group moves along the optical axis when the refractive power of the VR visual system changes from +2D to -5D satisfy the following condition: 1.05mm < (Dbs / Dbm) × ΔL < 1.75mm. By limiting (Dbs / Dbm) × ΔL to a reasonable range, the proportional relationship between the outer diameters of the two sides of the second lens barrel and the relationship between the distance the second element group moves along the optical axis when the refractive power changes from +2D to -5D can be constrained. This ensures that the VR visual system maintains stable performance during zooming, achieving a smooth and continuous zooming effect while maintaining high resolution and clear image quality.

[0065] In this embodiment, the inner diameter (dbm) of the second side of the second lens barrel, the effective focal length (f2) of the second lens, and the refractive index (N2) of the second lens satisfy the following condition: 0.25 < dbm / (f2 / N2) < 0.95. By limiting dbm / (f2 / N2) to a reasonable range, the relationship between the inner diameter of the second side of the second lens barrel and the second lens can be constrained, which helps to ensure the accurate installation position of the second lens, while ensuring a tight and stable fit between the second lens and the second lens barrel, and reducing the degradation of image quality caused by the positional deviation of the second lens.

[0066] In this embodiment, the first element group may further include a portion of the reflective element, attached to a portion of the effective path of the second side of the first lens, to accommodate various optical path implementation methods of the VR visual system. The reflective polarizing element can reflect or transmit light in a specific direction, with the polarization direction of the transmitted light orthogonal to the polarization direction of the reflected light. Both the first quarter-wave plate and the second quarter-wave plate can complete the complete conversion between linear and circular polarization states. The polarizer can transmit light with a specific polarization state as needed.

[0067] Second Implementation Method

[0068] like Figures 1 to 26As shown, the VR visual system includes a component group and a lens group. The component group, along the optical axis of the VR visual system from the first side to the second side, sequentially includes a first component group and a second component group. The second component group is movable along the optical axis. The first component group, along the optical axis from the first side to the second side, includes at least a reflective polarizing element, a first quarter-wave plate, and a first lens. The first lens has positive optical power, its first side surface is planar, and its second side surface is convex. The second component group, along the optical axis from the first side to the second side, includes at least a second lens, a second quarter-wave plate, a polarizer, and a display. The second lens has positive optical power, its first side surface is convex, and its second side surface is... The two sides are flat; the lens barrel assembly includes a first lens barrel and a second lens barrel, the first element group is housed in the first lens barrel, and the second element group is housed in the second lens barrel; wherein, the inner diameter dbs of the first side of the second lens barrel, the effective focal length f2 of the second lens, and the radius of curvature R3 of the first side of the second lens satisfy: 14.00mm≤dbs / (f2 / R3)≤20.65mm; the outer diameter Dbs of the first side of the second lens barrel, the inner diameter dbs of the first side of the second lens barrel, and the distance ΔL that the second element group moves along the optical axis when the refractive power of the VR visual system changes from +2D to -5D satisfy: 2.63≤(Dbs-dbs) / ΔL≤7.45.

[0069] The VR visual system of this application comprises a first element group including at least a reflective polarizing element, a first quarter-wave plate, and a first lens, and a second element group including a second lens, a second quarter-wave plate, a polarizer, and a display, arranged along the optical axis. The first and second element groups are respectively disposed within a first lens barrel and a second lens barrel, wherein the second lens barrel and the second element group as a whole are movable along the optical axis. By reasonably setting the inner and outer diameters of the first side of the second lens barrel, the effective focal length of the second lens, the radius of curvature of the first side of the second lens, and the moving distance of the second element group, it is helpful to maintain the stable installation of the second element group in the second lens barrel, while ensuring that the light is correctly focused to provide a clear virtual image. At the same time, it also ensures that the refractive power of the second element group in the second lens barrel can be stably adjusted from +2D to -5D, providing sufficient movement space to adapt to changes in refractive power, avoiding assembly errors caused by the movement of the second element group, maintaining the quality of the virtual image, and further ensuring the stable installation of the second element group in the second lens barrel, reducing imaging shift caused by changes in the external environment, and improving the stability and durability of the VR visual system.

[0070] This embodiment may also include other parametric expressions from the first embodiment, which will not be elaborated here.

[0071] In this application, at least one of the first and second lenses has an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0072] However, those skilled in the art will understand that the number of lenses constituting the VR visual system can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although two lenses are described as an example in the embodiments, the VR visual system is not limited to including two lenses. If necessary, the VR visual system may also include other numbers of lenses.

[0073] Figure 1 and Figure 2 The diagrams show the structure of a VR visual system of this application in the first and second states, respectively. Figure 1 and Figure 2 The diagram also labels parameters such as das to clearly and intuitively explain their meaning. To better illustrate the structure and specific surface shapes of the VR visual system, these parameters will not be shown in the accompanying diagrams when explaining specific examples.

[0074] It should be noted that in the following embodiments, the VR visual system of the same embodiment has a first state and a second state. The first lens and the second lens in these two states have the same radius of curvature, center thickness and higher order image coefficient, but the spacing distance between the first element group and the second element group, the lens barrel and other parameters are different.

[0075] It should be noted that the movement of the second element group along the optical axis closer to the first element group in the VR visual system causes a change in refractive power. The refractive power of the VR visual system is +2D in the first state and -5D in the second state. Specifically, the first state indicates that the VR visual system is suitable for users with a hyperopia of 200 degrees, and the second state indicates that the VR visual system is suitable for users with a myopia of 500 degrees. The VR visual system also has other states besides the first and second states, and the refractive power of the VR visual system in these other states can be between +2D and -5D.

[0076] It should be noted that the first side refers to the side of the human eye, and the second side refers to the side of the display screen, which can be used as the image surface.

[0077] The following describes, with reference to the accompanying drawings, specific surface features and parameters of the VR visual system applicable to the above embodiments.

[0078] Example 1

[0079] like Figures 3 to 4 As shown, the structure of the VR visual system of Embodiment 1 of this application in the first state and the second state are described respectively.

[0080] like Figures 3 to 4 As shown, the first element group is housed within the first lens barrel Pa, and the second element group is housed within the second lens barrel Pb. The VR visual system, from the first side to the second side, sequentially includes a reflective polarizing element RP, a first quarter-wave plate QWP1, a first lens E1, a partially reflective element BS, a second lens E2, a second quarter-wave plate QWP2, and a polarizer LP. It should be noted that in this embodiment, the first end of the first lens barrel Pa extends towards the optical axis so that the first side of the reflective polarizing element RP rests against the first lens barrel Pa. Therefore, the reflective polarizing element RP, the first quarter-wave plate QWP1, the first lens E1, and the partially reflective element BS are assembled from the second side of the first lens barrel Pa. Simultaneously, the second end of the second lens barrel Pb extends towards the optical axis so that the second side of the second lens rests against the second lens barrel Pb. Therefore, the second lens E2, the second quarter-wave plate QWP2, and the polarizer LP are assembled from the first side of the second lens barrel Pb.

[0081] In this embodiment, the first lens has positive optical power, a first side surface of the first lens is planar, and a second side surface of the first lens is convex. The second lens also has positive optical power, a first side surface of the second lens is convex, and a second side surface of the second lens is planar. The VR visual system further includes an aperture located between the first side and the first element group. The second side surface of the reflective polarizing element is in contact with the first side surface of the first quarter-wave plate. The second side surface of the first quarter-wave plate is in contact with at least a portion of the first side surface of the first lens. The first side surface of the partially reflective element is in contact with at least a portion of the second side surface of the first lens. The first side surface of the second quarter-wave plate is in contact with at least a portion of the second side surface of the second lens. The second side surface of the second quarter-wave plate is in contact with the first side surface of the polarizer. The first side surface of the image plane is in contact with at least a portion of the second side surface of the polarizer.

[0082] In this embodiment, light from the image plane IMG passes through polarizer LP, second quarter-wave plate QWP2, second lens E2, first lens E1, and first quarter-wave plate QWP1 before reaching reflective polarizer RP. After being reflected by reflective polarizer RP, the light passes sequentially through first quarter-wave plate QWP1 and first lens E1 before reaching partial reflective element BS on the second side of the first lens. After being reflected by partial reflective element BS, the light returns to first lens E1 and first quarter-wave plate QWP1, and is then transmitted through reflective polarizer RP before exiting.

[0083] Table 2 shows the basic structural parameters of the VR visual system in Embodiment 1. In Table 2, the units of radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). In Table 2, the light from the image surface IMG propagates from surface number 14 to the side of surface number 1. Refraction / reflection refers to the refraction or reflection of light by that surface during this passage.

[0084] Table 2

[0085]

[0086]

[0087] In Embodiment 1, the second side surface of the first lens and the first side surface of the second lens are aspherical surfaces. The shape of the aspherical surface can be defined using, but is not limited to, the following aspherical surface formula:

[0088]

[0089] Where x is the distance vector from the vertex of the aspherical surface at a height 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 radius of curvature R in Table 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 3 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the aspherical surface in Example 1.

[0090] Table 3

[0091] Face number 9 10 A4 4.3568E-06 1.6544E-05 A6 3.8240E-09 -8.1139E-07 A8 1.3745E-11 3.2323E-09 A10 2.7647E-14 0.0000E+00 A12 -7.3707E-17 0.0000E+00 A14 0.0000E+00 0.0000E+00 A16 0.0000E+00 0.0000E+00 A18 0.0000E+00 0.0000E+00 A20 0.0000E+00 0.0000E+00

[0092] In this embodiment, moving the second element group changes the refractive power of the VR visual system, enabling the system to switch from... Figure 3 The first state transition shown is to Figure 4 In the second state shown, some structural parameters of the VR visual system change. Specifically, the distance from the first side to the aperture on the optical axis is D1, and the distance between the first element group and the second element group on the optical axis is D2. Both D1 and D2 are in millimeters (mm). As shown in Table 4, D1 and D2 are different in the first and second states of the VR visual system.

[0093] Table 4

[0094] Status / Parameters D1 D2 First state 500.0000 2.1069 Second state -200.0000 1.0000

[0095] Figure 9 and Figure 10The MTF curves of the VR visual system of Embodiment 1 are shown in the first state and the second state, respectively. The MTF values ​​under the light of each field of view are all above 0.7, showing good imaging quality.

[0096] Example 2

[0097] like Figures 5 to 6 As shown, a VR viewing system according to Embodiment 2 of this application is described. Figure 5 and Figure 6 The first and second states of the VR visual system in Embodiment 2 are described respectively. The VR visual system in this embodiment has the same optical parameters as that in Embodiment 1, but different structural parameters. Please refer to the relevant description in Embodiment 1, which will not be repeated here.

[0098] Example 3

[0099] like Figures 7 to 8 The image shows a VR viewing system according to Embodiment 3 of this application. Figure 7 and Figure 8 The first and second states of the VR visual system in Embodiment 3 are described respectively. The VR visual system in this embodiment has the same optical parameters as that in Embodiment 1, but different structural parameters. Please refer to the relevant description in Embodiment 1, which will not be repeated here.

[0100] Example 4

[0101] like Figures 11 to 12 As shown, the structures of the VR visual system in the first and second states of Embodiment 4 of this application are described respectively.

[0102] like Figures 11 to 12 As shown, the first element group is housed within the first lens barrel Pa, and the second element group is housed within the second lens barrel Pb. The VR visual system, from the first side to the second side, sequentially includes a reflective polarizing element RP, a first quarter-wave plate QWP1, a first lens E1, a partially reflective element BS, a second lens E2, a second quarter-wave plate QWP2, and a polarizer LP. It should be noted that in this embodiment, the first end of the first lens barrel Pa extends towards the optical axis so that the first side of the reflective polarizing element RP rests against the first lens barrel Pa. Therefore, the reflective polarizing element RP, the first quarter-wave plate QWP1, the first lens E1, and the partially reflective element BS are assembled from the second side of the first lens barrel Pa. Simultaneously, the second end of the second lens barrel Pb extends towards the optical axis so that the second side of the second lens rests against the second lens barrel Pb. Therefore, the second lens E2, the second quarter-wave plate QWP2, and the polarizer LP are assembled from the first side of the second lens barrel Pb.

[0103] In this embodiment, the first lens has positive optical power, a first side surface of the first lens is planar, and a second side surface of the first lens is convex. The second lens also has positive optical power, a first side surface of the second lens is convex, and a second side surface of the second lens is planar. The VR visual system further includes an aperture located between the first side and the first element group. The second side surface of the reflective polarizing element is in contact with the first side surface of the first quarter-wave plate. The second side surface of the first quarter-wave plate is in contact with at least a portion of the first side surface of the first lens. The first side surface of the partially reflective element is in contact with at least a portion of the second side surface of the first lens. The first side surface of the second quarter-wave plate is in contact with at least a portion of the second side surface of the second lens. The second side surface of the second quarter-wave plate is in contact with the first side surface of the polarizer. The first side surface of the image plane is in contact with at least a portion of the second side surface of the polarizer.

[0104] In this embodiment, light from the image plane IMG passes through polarizer LP, second quarter-wave plate QWP2, second lens E2, first lens E1, and first quarter-wave plate QWP1 before reaching reflective polarizer RP. After being reflected by reflective polarizer RP, the light passes sequentially through first quarter-wave plate QWP1 and first lens E1 before reaching partial reflective element BS on the second side of the first lens. After being reflected by partial reflective element BS, the light returns to first lens E1 and first quarter-wave plate QWP1, and is then transmitted through reflective polarizer RP before exiting.

[0105] Table 5 shows the basic structural parameters of the VR visual system in Embodiment 4. In Table 5, the units of radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). In Table 5, the light from the image surface IMG propagates from surface number 14 to the side of surface number 1. Refraction / reflection refers to the refraction or reflection of light by that surface during this passage.

[0106] Table 5

[0107] Face number Surface type radius of curvature thickness Refractive index Dispersion coefficient Refraction / Reflection Conic coefficient spherical endless D1 refraction 1 Stabilizer (STO) spherical endless 12.0000 refraction 2 Reflective polarizing element (RP) spherical endless 0.1000 1.517 64.17 refraction 3 First quarter-wave plate (QWP1) spherical endless 0.1000 1.517 64.17 refraction 4 First lens (E1) spherical endless 6.6172 1.639 23.52 refraction 5 Partial reflective element (BS) aspherical -55.2294 -6.6172 1.639 23.52 reflection 2.8059 6 spherical endless -0.1000 1.517 64.17 refraction 7 Reflective polarizing element (RP) spherical endless 0.1000 1.517 64.17 reflection 8 First lens (E1) spherical endless 6.6172 1.639 23.52 refraction 9 aspherical -55.2294 D2 refraction 2.8059 10 Second lens (E2) aspherical 39.2193 8.0000 1.544 55.92 refraction 7.2329 11 Second quarter wave plate (QWP2) spherical endless 0.1000 1.517 64.17 refraction 12 Polarizing filter (LP) spherical endless 0.1000 1.517 64.17 refraction 13 spherical endless 0.0000 refraction 14 Image View (IMG) spherical endless 0.0000 refraction

[0108] Table 6 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the second side surface of the first lens and the first side surface of the second lens are aspherical surfaces.

[0109] Table 6

[0110] Face number 9 10 A4 3.2268E-06 1.0535E-05 A6 1.4104E-09 -2.6024E-07 A8 1.7916E-11 1.3695E-09 A10 -2.2793E-14 0.0000E+00 A12 -3.9628E-18 0.0000E+00 A14 0.0000E+00 0.0000E+00 A16 0.0000E+00 0.0000E+00 A18 0.0000E+00 0.0000E+00 A20 0.0000E+00 0.0000E+00

[0111] In this embodiment, moving the second element group changes the refractive power of the VR visual system, enabling the system to switch from... Figure 11 The first state transition shown is to Figure 12In the second state shown, some structural parameters of the VR visual system change. Specifically, the distance from the first side to the aperture on the optical axis is D1, and the distance between the first element group and the second element group on the optical axis is D2. Both D1 and D2 are in millimeters (mm). As shown in Table 7, D1 and D2 are different in the first and second states of the VR visual system.

[0112] Table 7

[0113] Status / Parameters D1 D2 First state 500.0000 2.5181 Second state -200.0000 1.0000

[0114] Figure 17 and Figure 18 The MTF curves of the VR visual system of Embodiment 4 are shown in the first and second states, respectively. The MTF values ​​under the light of each field of view are all above 0.7, showing good imaging quality.

[0115] Example 5

[0116] like Figures 13 to 14 As shown, a VR viewing system according to Embodiment 5 of this application is described. Figure 13 and Figure 14 The first and second states of the VR visual system in Embodiment 5 are described respectively. The VR visual system in this embodiment has the same optical parameters as that in Embodiment 4, but different structural parameters. Please refer to the relevant description in Embodiment 4, which will not be repeated here.

[0117] Example 6

[0118] like Figures 15 to 16 The image shows a VR viewing system according to Embodiment Six of this application. Figure 15 and Figure 16 The first and second states of the VR visual system in Embodiment Six are described respectively. The VR visual system in this embodiment has the same optical parameters as that in Embodiment Four, but different structural parameters. Please refer to the relevant description in Embodiment Four, which will not be repeated here.

[0119] Example 7

[0120] like Figures 19 to 20 As shown, the structures of the VR visual system of Embodiment Seven of this application in the first and second states are described respectively.

[0121] like Figures 19 to 20As shown, the first element group is housed within the first lens barrel Pa, and the second element group is housed within the second lens barrel Pb. The VR visual system, from the first side to the second side, sequentially includes a reflective polarizing element RP, a first quarter-wave plate QWP1, a first lens E1, a partially reflective element BS, a second lens E2, a second quarter-wave plate QWP2, and a polarizer LP. It should be noted that in this embodiment, the first end of the first lens barrel Pa extends towards the optical axis so that the first side of the reflective polarizing element RP rests against the first lens barrel Pa. Therefore, the reflective polarizing element RP, the first quarter-wave plate QWP1, the first lens E1, and the partially reflective element BS are assembled from the second side of the first lens barrel Pa. Simultaneously, the second end of the second lens barrel Pb extends towards the optical axis so that the second side of the second lens rests against the second lens barrel Pb. Therefore, the second lens E2, the second quarter-wave plate QWP2, and the polarizer LP are assembled from the first side of the second lens barrel Pb.

[0122] In this embodiment, the first lens has positive optical power, a first side surface of the first lens is planar, and a second side surface of the first lens is convex. The second lens also has positive optical power, a first side surface of the second lens is convex, and a second side surface of the second lens is planar. The VR visual system further includes an aperture located between the first side and the first element group. The second side surface of the reflective polarizing element is in contact with the first side surface of the first quarter-wave plate. The second side surface of the first quarter-wave plate is in contact with at least a portion of the first side surface of the first lens. The first side surface of the partially reflective element is in contact with at least a portion of the second side surface of the first lens. The first side surface of the second quarter-wave plate is in contact with at least a portion of the second side surface of the second lens. The second side surface of the second quarter-wave plate is in contact with the first side surface of the polarizer. The first side surface of the image plane is in contact with at least a portion of the second side surface of the polarizer.

[0123] In this embodiment, light from the image plane IMG passes through polarizer LP, second quarter-wave plate QWP2, second lens E2, first lens E1, and first quarter-wave plate QWP1 before reaching reflective polarizer RP. After being reflected by reflective polarizer RP, the light passes sequentially through first quarter-wave plate QWP1 and first lens E1 before reaching partial reflective element BS on the second side of the first lens. After being reflected by partial reflective element BS, the light returns to first lens E1 and first quarter-wave plate QWP1, and is then transmitted through reflective polarizer RP before exiting.

[0124] Table 8 shows the basic structural parameters of the VR visual system of Embodiment 7. In Table 8, the units of radius of curvature, thickness / distance and effective focal length are all millimeters (mm). In Table 8, the light from the image surface IMG propagates from surface number 14 to the side of surface number 1. Refraction / reflection refers to the refraction or reflection of light by the surface during this passage.

[0125] Table 8

[0126] Face number Surface type radius of curvature thickness Refractive index Dispersion coefficient Refraction / Reflection Conic coefficient spherical endless D1 refraction 1 Stabilizer (STO) spherical endless 11.0000 refraction 2 Reflective polarizing element (RP) spherical endless 0.1000 1.517 64.17 refraction 3 First quarter-wave plate (QWP1) spherical endless 0.1000 1.517 64.17 refraction 4 First lens (E1) spherical endless 7.1903 1.810 41.00 refraction 5 Partial reflective element (BS) aspherical -59.9020 -7.1903 1.810 41.00 reflection 2.7905 6 spherical endless -0.1000 1.517 64.17 refraction 7 Reflective polarizing element (RP) spherical endless 0.1000 1.517 64.17 reflection 8 First lens (E1) spherical endless 7.1903 1.810 41.00 refraction 9 aspherical -59.9020 D2 refraction 2.7905 10 Second lens (E2) aspherical 62.3908 8.0000 1.544 55.92 refraction 16.6530 11 Second quarter wave plate (QWP2) spherical endless 0.1000 1.517 64.17 refraction 12 Polarizing filter (LP) spherical endless 0.1000 1.517 64.17 refraction 13 spherical endless 0.0000 refraction 14 Image View (IMG) spherical endless 0.0000 refraction

[0127] Table 9 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the second side surface of the first lens and the first side surface of the second lens are aspherical surfaces.

[0128] Table 9

[0129] Face number 9 10 A4 2.8933E-06 1.8973E-05 A6 -2.2868E-09 -2.9308E-07 A8 2.9192E-11 1.2936E-09 A10 -4.7550E-14 0.0000E+00 A12 1.9262E-17 0.0000E+00 A14 0.0000E+00 0.0000E+00 A16 0.0000E+00 0.0000E+00 A18 0.0000E+00 0.0000E+00 A20 0.0000E+00 0.0000E+00

[0130] In this embodiment, moving the second element group changes the refractive power of the VR visual system, enabling the system to switch from... Figure 19 The first state transition shown is to Figure 20 In the second state shown, some structural parameters of the VR visual system change. Specifically, the distance from the first side to the aperture on the optical axis is D1, and the distance between the first element group and the second element group on the optical axis is D2. Both D1 and D2 are in millimeters (mm). As shown in Table 10, D1 and D2 are different in the first and second states of the VR visual system.

[0131] Table 10

[0132] Status / Parameters D1 D2 First state 500.0000 2.3864 Second state -200.0000 1.0000

[0133] Figure 25 and Figure 26 The MTF curves of the VR visual system of Embodiment 7 are shown in the first state and the second state, respectively. The MTF values ​​under the light of each field of view are all above 0.7, showing good imaging quality.

[0134] Example 8

[0135] like Figures 21 to 22 The image shows a VR viewing system according to Embodiment 8 of this application. Figures 21 to 22 The first and second states of the VR visual system in Embodiment 8 are described respectively. The VR visual system in this embodiment has the same optical parameters as that in Embodiment 7, but different structural parameters. Please refer to the relevant description in Embodiment 7, which will not be repeated here.

[0136] Example 9

[0137] like Figures 23 to 24 As shown, a VR visual system according to Embodiment Nine of this application is described. Figure 23 and Figure 24The first and second states of the VR visual system in Embodiment Nine are described respectively. The VR visual system in this embodiment has the same optical parameters as that in Embodiment Seven, but different structural parameters. Please refer to the relevant description in Embodiment Seven, which will not be repeated here.

[0138] In summary, embodiments one through nine of the VR visual system satisfy the relationships shown in Table 11. Specifically, the conditional values ​​of the first and second states corresponding to each embodiment of the VR visual system are identical.

[0139] Table 11

[0140] Conditional / Example 1 2 3 4 5 6 7 8 9 fz1 / dam 1.97 2.56 2.00 2.10 2.66 2.19 1.60 2.09 1.79 (Dbs-dbs) / ΔL 3.61 3.63 7.45 2.63 2.63 4.04 2.89 2.89 4.42 (CTR+CTQ1+CT1) / La 1.03 1.18 1.00 1.00 1.29 1.19 1.28 1.26 1.14 dbm / (CT2+CTQ2+CTL) 3.15 2.91 5.22 2.96 2.20 4.38 2.49 2.91 4.61 Lb / Δf 28.50 27.57 26.09 25.20 24.82 20.74 43.75 44.95 37.92 dbs / (f2 / R3)(mm) 15.95 16.07 14.00 18.38 19.27 15.93 20.25 20.65 16.95 R2 / Dam -1.18 -1.15 -1.19 -1.26 -1.35 -1.31 -1.22 -1.37 -1.36 fz2 / Dbm 1.89 1.97 1.55 2.17 2.10 1.87 3.13 3.10 2.83 Δf×(Das / das)(mm) 0.36 0.25 0.36 0.42 0.30 0.41 0.26 0.17 0.24 (f1 / N1) / das 1.86 1.18 1.82 1.99 1.29 1.98 1.44 0.98 1.44 La / EPD 1.60 1.40 1.64 1.70 1.32 1.43 1.45 1.46 1.62 fz1 / La 11.71 13.44 11.43 12.69 16.40 15.11 12.79 12.65 11.44 fz2 / Lb 8.30 8.58 9.07 10.60 10.76 12.87 16.39 15.95 18.91 (Dbs / Dbm)×ΔL(mm) 1.28 1.34 1.07 1.72 1.74 1.39 1.56 1.57 1.28 dbm / (f2 / N2) 0.55 0.51 0.92 0.52 0.39 0.77 0.27 0.32 0.51

[0141] Table 12 shows the effective focal length and some structural parameters of each lens and component group of the VR visual system in Examples 1 to 9, in mm.

[0142] Table 12

[0143]

[0144]

[0145] Table 13 shows some structural parameters of the VR visual systems of Examples 1 to 9, in mm.

[0146] Table 13

[0147] Parameters / Examples 1 2 3 4 5 6 7 8 9 das 24.565 38.892 25.092 26.540 40.868 26.596 28.411 41.726 28.462 dam 38.023 29.296 37.432 41.063 32.474 39.463 46.248 35.346 41.328 Das 38.144 42.229 38.447 40.185 44.205 40.175 45.370 44.405 42.041 Dam 40.755 41.590 40.164 43.796 40.985 42.195 48.980 43.841 44.061 dbs 29.332 29.536 25.738 33.790 35.428 29.285 37.227 37.974 31.171 dbm 19.544 18.054 32.362 24.288 18.060 35.909 20.404 23.885 37.795 Dbs 33.332 33.549 33.982 37.790 39.428 35.417 41.227 41.974 37.303 Dbm 28.804 27.657 35.095 33.263 34.408 38.641 36.699 36.976 40.527 La 6.407 5.583 6.567 6.809 5.269 5.717 5.784 5.845 6.466 Lb 6.554 6.340 6.000 6.805 6.702 5.601 7.000 7.192 6.067

[0148] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0149] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0150] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0151] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A VR visual system, characterized in that, The VR visual system includes: The component group, along the optical axis of the VR visual system from the first side to the second side, sequentially includes a first component group and a second component group. The second component group is movable along the direction of the optical axis. The first component group along the optical axis from the first side to the second side includes at least a reflective polarizing element, a first quarter-wave plate, and a first lens. The first lens has positive optical power, a first side surface of the first lens is planar, and a second side surface of the first lens is convex. The second component group along the optical axis from the first side to the second side includes at least a second lens, a second quarter-wave plate, a polarizer, and a display. The second lens has positive optical power, a first side surface of the second lens is convex, and a second side surface of the second lens is planar. The lens barrel assembly includes a first lens barrel and a second lens barrel, wherein the first element group is housed in the first lens barrel and the second element group is housed in the second lens barrel; The combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens, and the inner diameter dam of the second side of the first lens barrel satisfy the following condition: 1.60≤fz1 / dam≤2.66; The outer diameter Dbs of the first side of the second lens tube, the inner diameter dbs of the first side of the second lens tube, and the distance ΔL that the second element group moves along the optical axis when the refractive power of the VR visual system changes from +2D to -5D satisfy the following: 2.63≤(Dbs-dbs) / ΔL≤7.

45.

2. The VR visual system according to claim 1, characterized in that, The center thickness CTR of the reflective polarizing element on the optical axis, the center thickness CTQ1 of the first quarter-wave plate on the optical axis, the center thickness CT1 of the first lens on the optical axis, and the maximum thickness La from the first side surface of the first lens barrel to the second side surface of the first lens barrel along the optical axis satisfy the following: 1.00≤(CTR+CTQ1+CT1) / La≤1.

29.

3. The VR visual system according to claim 1, characterized in that, The inner diameter dbm of the second side of the second lens barrel, the center thickness CT2 of the second lens on the optical axis, the center thickness CTQ2 of the second quarter-wave plate on the optical axis, and the center thickness CTL of the polarizer on the optical axis satisfy the following condition: 2.20≤dbm / (CT2+CTQ2+CTL)≤5.

22.

4. The VR visual system according to claim 1, characterized in that, The maximum thickness Lb from the first side to the second side of the second lens barrel along the optical axis and the change in effective focal length Δf of the VR visual system from +2D to -5D satisfy the following: 20.74≤Lb / Δf≤44.

95.

5. The VR visual system according to claim 1, characterized in that, The inner diameter dbs of the first side of the second lens barrel, the effective focal length f2 of the second lens, and the radius of curvature R3 of the first side of the second lens satisfy the following condition: 14.00mm≤dbs / (f2 / R3)≤20.65mm.

6. The VR visual system according to claim 1, characterized in that, The radius of curvature R2 of the second side of the first lens and the outer diameter Dam of the second side of the first lens barrel satisfy the following condition: -1.37≤R2 / Dam≤-1.

15.

7. The VR visual system according to claim 1, characterized in that, The combined focal length fz2 of the second lens, the second quarter-wave plate, and the polarizer, and the outer diameter Dbm of the second side of the second lens barrel satisfy the following condition: 1.55≤fz2 / Dbm≤3.

13.

8. The VR visual system according to claim 1, characterized in that, The effective focal length change Δf of the VR visual system when the diopter changes from +2D to -5D, the outer diameter Das of the first side of the first lens barrel, and the inner diameter Das of the first side of the first lens barrel satisfy the following condition: 0.15mm < Δf × (Das / das) < 0.45mm.

9. The VR visual system according to claim 1, characterized in that, The effective focal length f1 of the first lens, the refractive index N1 of the first lens, and the inner diameter das of the first side of the first lens barrel satisfy the following condition: 0.98≤(f1 / N1) / das≤1.

99.

10. The VR visual system according to claim 1, characterized in that, The maximum thickness La from the first side of the first lens barrel to the second side of the first lens barrel along the optical axis and the entrance pupil diameter EPD of the VR visual system satisfy the following: 1.32≤La / EPD≤1.

70.

11. The VR visual system according to claim 1, characterized in that, The combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens, and the maximum thickness La of the first side surface of the first lens barrel to the second side surface of the first lens barrel along the optical axis satisfy the following: 11.43≤fz1 / La≤16.

40.

12. The VR visual system according to claim 1, characterized in that, The combined focal length fz2 of the second lens, the second quarter-wave plate, and the polarizer, and the maximum thickness Lb of the second lens barrel from the first side to the second side along the optical axis satisfy the following: 8.30≤fz2 / Lb≤18.

91.

13. The VR visual system according to claim 1, characterized in that, The outer diameter Dbs of the first side of the second lens barrel, the outer diameter Dbm of the second side of the second lens barrel, and the distance ΔL that the second element group moves along the optical axis when the refractive power of the VR visual system changes from +2D to -5D satisfy the following: 1.05mm < (Dbs / Dbm) × ΔL < 1.75mm.

14. The VR visual system according to claim 1, characterized in that, The inner diameter dbm of the second side of the second lens barrel, the effective focal length f2 of the second lens, and the refractive index N2 of the second lens satisfy the following condition: 0.25 < dbm / (f2 / N2) < 0.95.

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