VR visual system

Abstract

The utility model provides a VR visual system, including element group and lens cone group, element group along the optical axis of VR visual system from the first side to the second side in order including first element group and second element group, the second element group can move in the direction of optical axis, the combined focal length fz2 of the second lens, the second quarter-wave plate and the polaroid and the inner diameter dbs of the first side surface of the second lens barrel meet the condition that fz2 / dbs is greater than or equal to 1.84 and less than or equal to 4.71; the outer diameter Dbs of the first side surface of the second lens cone, the outer diameter Dbm of the second 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 changed from + 2D to-5D satisfy the following condition: Dbs-Dbm / delta L is greater than or equal to 1.01 and less than or equal to 5.32. The VR visual system solves the problem that a VR visual system in the prior art is large in diopter adjusting range and high in definition.

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, as a key technology 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 current VR visual systems often cannot provide a sufficient range of refractive power adjustment. Furthermore, when adjusting refractive power, VR visual systems exhibit high image field dispersion, resulting in poor image clarity. 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 image clarity is a crucial issue. Utility Model Content

[0003] The main objective of this invention is to provide a VR visual system that solves the problem of balancing a large diopter adjustment range and high imaging clarity in existing VR visual systems.

[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 to move closer to or further away from the first element group. 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, a first lens, and a partially reflective element. 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 lens has positive optical power. The first side of the second lens 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 fz2 of the second lens, the second quarter-wave plate, and the polarizer, and the inner diameter dbs of the first side of the second lens barrel satisfy the following: 1.84≤fz2 / dbs≤4.71. 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: 1.01≤|Dbs-Dbm| / ΔL≤5.32.

[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 optical axis to move closer to or further away from the first element group; the first element group including at least a reflective polarizing element, a first quarter-wave plate, a first lens, and a partially reflective element 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 maximum thickness La of the first side surface to the second side surface of the first lens barrel along the optical axis and the change Δf of the effective focal length of the VR visual system when the refractive power of the VR visual system changes from +2D to -5D satisfy: 24.27≤La / Δf≤47.51; the outer diameter Dbs of the first side surface of the second lens barrel, the outer diameter Dbm of the second side surface of the second lens barrel, and the distance ΔL of the second element group moving along the optical axis when the refractive power of the VR visual system changes from +2D to -5D satisfy: 1.01≤|Dbs-Dbm| / ΔL≤5.32.

[0006] Furthermore, 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, and the change in the effective focal length Δf of the VR visual system when the refractive power of the VR visual system changes from +2D to -5D, satisfy the following: 24.27≤La / Δf≤47.51.

[0007] Furthermore, the maximum thickness Lb from the first side to the second side of the second lens tube along the optical axis, 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: 3.52≤Lb / ΔL≤7.44.

[0008] Furthermore, the outer diameter Das of the first side of the first lens barrel, the outer diameter Dam of the second side of the first lens barrel, the combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens satisfy the following: 0.88≤(Das+Dam) / fz1≤1.25.

[0009] Furthermore, 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, the effective focal length f1 of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: -6.55mm < La / (f1 / R2) < -3.55mm.

[0010] Furthermore, the effective focal length f2 of the second lens, the inner diameter dbs of the first side of the second lens barrel, and the inner diameter dbm of the second side of the second lens barrel satisfy the following condition: 0.94≤f2 / (dbs+dbm)≤2.23.

[0011] Furthermore, the inner diameter das of the first side of the first lens barrel, the inner diameter dam of the second side of the first lens barrel, and the entrance pupil diameter EPD of the VR visual system satisfy the following: 0.23≤EPD / |das-dam|≤0.81.

[0012] Furthermore, the radius of curvature R3 of the first side surface of the second lens, the refractive index N2 of the second lens, and the outer diameter Dbs of the first side surface of the second lens barrel satisfy the following condition: 0.56≤(R3 / N2) / Dbs≤1.27.

[0013] Furthermore, the inner diameter dam of the second side of the first lens barrel, the center thickness CT1 of the first lens on the optical axis, and the refractive index N1 of the first lens satisfy the following condition: 2.8 < dam / (CT1×N1) < 4.3.

[0014] Furthermore, the outer diameter Das of the first side of the first lens barrel and the dispersion coefficient V1 of the first lens satisfy the following condition: 1.09mm≤Das / V1≤1.80mm.

[0015] Furthermore, the maximum thickness Lb from the first side to the second side of the second lens barrel along the optical axis, the effective focal length f2 of the second lens, and the dispersion coefficient V2 of the second lens satisfy the following condition: 2.16≤Lb / (f2 / V2)≤6.80.

[0016] Furthermore, the outer diameter Dbs of the first side of the second lens barrel, the inner diameter dbm of the second side of the second lens barrel, and the center thickness CT2 of the second lens on the optical axis satisfy the following: 0.07≤|Dbs-dbm| / CT2≤2.58.

[0017] Furthermore, when the refractive power of the VR visual system changes from +2D to -5D, the change in the effective focal length Δf of the VR visual system, the inner diameter dbs of the first side of the second lens barrel, and the inner diameter dbm of the second side of the second lens barrel satisfy the following condition: 0.1mm < Δf × (dbs / dbm) < 0.4mm.

[0018] Furthermore, the outer diameter Dbs of the first side of the second lens tube and the maximum thickness Lb of the second side of the second lens tube along the optical axis satisfy the following condition: 4.34≤Dbs / Lb≤7.19.

[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 can move along the optical axis to approach or move away from the first element group. 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, a first lens, and a partially reflective element. 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. The first side surface of the second lens is convex, and the second side surface of the second lens is flat. The lens barrel assembly includes a first lens barrel and a second lens barrel, with the first element group housed in the first lens barrel and the second element group housed in the second lens barrel. The combined focal length fz2 of the second lens, the second quarter-wave plate, and the polarizer, and the inner diameter dbs of the first side surface of the second lens barrel satisfy the following: 1.84≤fz2 / dbs≤4.71. The outer diameter Dbs of the first side surface of the second lens barrel, the outer diameter Dbm of the second 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 the following: 1.01≤|Dbs-Dbm| / ΔL≤5.32.

[0020] The VR visual system of this application comprises a first element group along the optical axis, including at least a reflective polarizing element, a first quarter-wave plate, a first lens, and a partially reflective element; and a second element group including a second lens, a second quarter-wave plate, a polarizer, and a display. The first and second element groups are respectively housed within a first and a second lens barrel. The second lens barrel and the second element group move as a whole along the optical axis to adjust the refractive power of the VR visual system from +2D to -5D. By controlling the combined focal length of the second lens, the second quarter-wave plate, and the polarizer, the inner and outer diameters of the second lens barrel, and the movement distance of the second element group during refractive power changes, the zoom mechanism of the VR visual system can be optimized. This results in a uniform distribution of image field curvature with small differences and low dispersion during zooming, thus ensuring image stability and continuity. Simultaneously, it helps reduce mechanical errors and wear during zooming, improving the lifespan 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 1A 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] Figure 27 The diagram shows the defocus curve of a VR visual system according to an optional embodiment of the present invention under the conditions of fz2 / dbs=2.75 and |Dbs-Dbm| / ΔL=2.85;

[0037] Figure 28 The defocus curve of the VR visual system of Comparative Example 1 is shown under the conditions of fz2 / dbs=5.1 and |Dbs-Dbm| / ΔL=5.5;

[0038] Figure 29 The defocus curve of the VR visual system of Comparative Example 2 is shown under the conditions of fz2 / dbs=1.5 and |Dbs-Dbm| / ΔL=0.8.

[0039] The above figures include the following reference numerals:

[0040] 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

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] To address the problem of balancing a large diopter adjustment range and high definition in existing VR visual systems, this invention provides a VR visual system.

[0048] First Implementation Method

[0049] like Figures 1 to 27 As 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 can move along the optical axis to move closer to or further away from the first component group. 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, a first lens, and a partially reflective element. 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. The first side of the lens 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 fz2 of the second lens, the second quarter-wave plate, and the polarizer, and the inner diameter dbs of the first side of the second lens barrel satisfy the following: 1.84≤fz2 / dbs≤4.71. 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: 1.01≤|Dbs-Dbm| / ΔL≤5.32.

[0050] The VR visual system of this application comprises a first element group along the optical axis, including at least a reflective polarizing element, a first quarter-wave plate, a first lens, and a partially reflective element; and a second element group including a second lens, a second quarter-wave plate, a polarizer, and a display. The first and second element groups are respectively housed within a first and a second lens barrel. The second lens barrel and the second element group move as a whole along the optical axis to adjust the refractive power of the VR visual system from +2D to -5D. By controlling the combined focal length of the second lens, the second quarter-wave plate, and the polarizer, the inner and outer diameters of the second lens barrel, and the movement distance of the second element group during refractive power changes, the zoom mechanism of the VR visual system can be optimized. This results in a uniform distribution of image field curvature with small differences and low dispersion during zooming, thus ensuring image stability and continuity. Simultaneously, it helps reduce mechanical errors and wear during zooming, improving the lifespan of the VR visual system.

[0051] like Figure 28 As shown, the defocus curves of the VR visual system in Comparative Example 1 are presented under the conditions of fz2 / dbs=5.1 and |Dbs-Dbm| / ΔL=5.5. Under different defocus amounts, the defocus curves show significant shifts, indicating poor imaging performance of the VR visual system. Figure 29 As shown, the defocus curve of the VR visual system in Comparative Example 2 is given under the conditions of fz2 / dbs=1.5 and |Dbs-Dbm| / ΔL=0.8. The defocus curves under different defocus amounts also show large shifts, indicating that the imaging performance of the VR visual system is poor.

[0052] The VR visual system of this invention can achieve high imaging performance by controlling 1.84≤fz2 / dbs≤4.71 and 1.01≤|Dbs-Dbm| / ΔL≤5.32. For example, Figure 27 In one alternative embodiment shown, under the conditions of fz2 / dbs=2.75 and |Dbs-Dbm| / ΔL=2.85, the defocus curve shift is very small, indicating that the VR visual system can achieve a relatively ideal imaging effect.

[0053] In this embodiment, the maximum thickness La along the optical axis from the first side to the second side of the first lens barrel, and the change Δf of the effective focal length of the VR visual system when the refractive power of the VR visual system changes from +2D to -5D, satisfy the following condition: 24.27 ≤ La / Δf ≤ 47.51. By limiting La / Δf within a reasonable range, it can be ensured that the first lens barrel has sufficient structural strength and stability to withstand the stress and deformation generated when the focal length changes. This avoids the first lens barrel being too thick, which would increase material costs and manufacturing difficulties, and also avoids the first lens barrel being too thin, which would fail to meet the structural strength and optical performance requirements of the VR visual system.

[0054] 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 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: 3.52 ≤ Lb / ΔL ≤ 7.44. By limiting Lb / ΔL to a reasonable range, the second element group is allowed to move along the optical axis when the focal length changes within a certain range. This allows the VR visual system to adapt to different viewing distances and display image sizes, ensuring zoom functionality. Furthermore, the appropriate thickness of the second lens barrel helps reduce optical aberrations in the VR visual system and improves its imaging quality.

[0055] In this embodiment, the outer diameter Das of the first side of the first lens barrel, the outer diameter Dam of the second side of the first lens barrel, the combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate, and the first lens satisfy the following condition: 0.88 ≤ (Das + Dam) / fz1 ≤ 1.25. By limiting (Das + Dam) / fz1 to a reasonable range, the relationship between the outer diameter of the first lens barrel and the combined focal length of the first element is constrained, ensuring the stable performance of the VR visual system. This avoids the situation where the outer diameter of the first lens barrel is too small compared to the combined focal length of the first element, leading to increased processing difficulty or insufficient space, which would affect the light transmission and focusing effect. It also avoids the situation where the outer diameter of the first lens barrel is too large compared to the combined focal length of the first element, resulting in an overly bulky first lens barrel, which would be detrimental to the lightweighting and miniaturization of the VR visual system.

[0056] In this embodiment, the maximum thickness La from the first side surface to the second side surface of the first lens barrel along the optical axis, the effective focal length f1 of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following condition: -6.55mm < La / (f1 / R2) < -3.55mm. By limiting La / (f1 / R2) within a reasonable range, the radius of curvature of the second side surface of the first lens is matched with the thickness of the first lens barrel along the optical axis, ensuring that light can be correctly focused with minimal aberration loss when passing through the first lens. This optimizes the imaging clarity of the VR visual system and also enables the VR visual system to reduce aberrations and distortion while ensuring clear imaging.

[0057] In this embodiment, the effective focal length f2 of the second lens, the inner diameter dbs of the first side of the second lens barrel, and the inner diameter dbm of the second side of the second lens barrel satisfy the following condition: 0.94 ≤ f2 / (dbs+dbm) ≤ 2.23. By limiting f2 / (dbs+dbm) to a reasonable range, the light transmission path within the second lens barrel can be optimized, ensuring that the light is effectively focused when passing through the second lens. Simultaneously, the light can pass through the second lens barrel efficiently, avoiding the increase in light loss and stray light caused by improper inner diameter settings of the second lens barrel, thereby improving the imaging quality of the VR visual system.

[0058] In this embodiment, the inner diameter das of the first side of the first lens barrel, the inner diameter dam of the second side of the first lens barrel, and the entrance pupil diameter EPD of the VR visual system satisfy the following: 0.23 ≤ EPD / |das-dam| ≤ 0.81. By limiting EPD / |das-dam| to a reasonable range, and under the premise of stable EPD, it helps to ensure the stability of the inner diameter dimension of the first lens barrel during manufacturing and use, thereby improving the stability and durability of the VR visual system. It also enables the compactness of the first lens barrel structure, which helps to reduce the size and weight of the VR visual system, and improves the portability and user experience of the VR visual system.

[0059] In this embodiment, the radius of curvature R3 of the first side surface of the second lens, the refractive index N2 of the second lens, and the outer diameter Dbs of the first side surface of the second lens barrel satisfy the following condition: 0.56 ≤ (R3 / N2) / Dbs ≤ 1.27. By limiting (R3 / N2) / Dbs within a reasonable range, the refractive performance of the second lens is optimized, i.e., the focusing performance of light passing through the second lens is optimized, reducing spherical aberration and chromatic aberration. Simultaneously, constraining (R3 / N2) / Dbs ensures the matching degree between the second lens and the lens barrel, allowing light to effectively pass through the lens barrel after being focused by the two lenses, reducing light loss and stray light. It also ensures that the second lens barrel maintains sufficient strength and stability while having a small outer diameter, thereby achieving the compactness, stability, and durability of the VR visual system.

[0060] In this embodiment, the inner diameter dam of the second side of the first lens barrel, the center thickness CT1 of the first lens on the optical axis, and the refractive index N1 of the first lens satisfy the following condition: 2.8 < dam / (CT1×N1) < 4.3. By limiting dam / (CT1×N1) within a reasonable range, not only is the dimensional matching and structural stability between the first lens and the first lens barrel ensured, but optical focusing efficiency is also improved, aberrations are reduced, and thus the imaging quality and user experience of the VR visual system are significantly enhanced. Furthermore, it helps the VR visual system achieve smooth transitions and stable imaging during zooming, ensuring that the relative position between the first lens and the first lens barrel remains stable when adjusting the focal length, thereby avoiding a sharp decline in imaging quality.

[0061] In this embodiment, the outer diameter Das of the first side of the first lens barrel and the dispersion coefficient V1 of the first lens satisfy the following relationship: 1.09mm ≤ Das / V1 ≤ 1.80mm. By limiting Das / V1 within a reasonable range, it not only helps to achieve effective chromatic aberration correction and ensures the color accuracy and clarity of the image at different focal lengths, but also maintains the structural compactness and strength of the VR visual system. Furthermore, it increases the design flexibility of the VR visual system, allowing for the selection of appropriate lens materials and lens barrel sizes based on specific applications and cost requirements, thereby enhancing the market competitiveness of the VR visual system.

[0062] In this embodiment, the maximum thickness Lb from the first side to the second side of the second lens barrel along the optical axis, the effective focal length f2 of the second lens, and the dispersion coefficient V2 of the second lens satisfy the following condition: 2.16 ≤ Lb / (f2 / V2) ≤ 6.80. By limiting Lb / (f2 / V2) within a reasonable range, the stability of the VR visual system is achieved while ensuring structural strength, reducing imaging errors caused by factors such as temperature changes and vibration, and ensuring high-quality images can be presented in various usage environments.

[0063] In this embodiment, the outer diameter Dbs of the first side of the second lens barrel, the inner diameter dbm of the second side of the second lens barrel, and the center thickness CT2 of the second lens on the optical axis satisfy the following condition: 0.07 ≤ |Dbs-dbm| / CT2 ≤ 2.58. By limiting |Dbs-dbm| / CT2 within a reasonable range, the structural matching between the second lens barrel and the second lens is optimized, ensuring that the second lens can be stably installed inside the second lens barrel, while reducing assembly errors and performance degradation caused by dimensional mismatch. Furthermore, constraining |Dbs-dbm| / CT2 also ensures the structural stability and optical focusing capability of the VR visual system during zooming, improving the long-term user experience.

[0064] In this embodiment, when the refractive power of the VR visual system changes from +2D to -5D, the change in effective focal length Δf of the VR visual system, the inner diameter dbs of the first side of the second lens barrel, and the inner diameter dbm of the second side of the second lens barrel satisfy the following condition: 0.1mm < Δf × (dbs / dbm) < 0.4mm. By limiting Δf × (dbs / dbm) within a reasonable range, it can be ensured that the structure of the second lens barrel is neither too compact, leading to assembly difficulties, nor too loose, affecting stability. Furthermore, constraining Δf × (dbs / dbm) also ensures the coordination between the zoom performance of the VR visual system and the inner diameter of the second lens barrel, reducing aberrations and instability caused by improper adjustment of optical element positions, thereby significantly improving the imaging quality and user experience of the VR visual system.

[0065] In this embodiment, the outer diameter Dbs of the first side of the second lens barrel and the maximum thickness Lb of the second side of the second lens barrel along the optical axis satisfy the following: 4.34 ≤ Dbs / Lb ≤ 7.19. By limiting Dbs / Lb within a reasonable range, it helps to ensure that the structure of the second lens barrel is neither too bulky nor too thin, thereby achieving a compact design of the VR visual system while ensuring strength, and meeting the requirements of being both lightweight and having good optical performance.

[0066] Second Implementation Method

[0067] like Figures 1 to 27As shown, 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 can move along the optical axis to approach or move away from the first element group. 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, a first lens, and a partially reflective element. 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, its first side surface is convex, and the second lens… The second side 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 maximum thickness La of the first side to the second side of the first lens barrel along the optical axis and the change Δf of the effective focal length of the VR visual system when the refractive power of the VR visual system changes from +2D to -5D satisfy: 24.27≤La / Δf≤47.51; 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 of the second element group moving along the optical axis when the refractive power of the VR visual system changes from +2D to -5D satisfy: 1.01≤|Dbs-Dbm| / ΔL≤5.32.

[0068] The VR visual system of this application comprises a first element group along the optical axis, including at least a reflective polarizing element, a first quarter-wave plate, a first lens, and a partially reflective element, and a second element group including a second lens, a second quarter-wave plate, a polarizer, and a display. The first and second element groups are respectively disposed within a first lens barrel and a second lens barrel. The second lens barrel and the second element group move as a whole along the optical axis to adjust the refractive power of the VR visual system from +2D to -5D. By controlling the thickness of the first lens barrel along the optical axis, the inner and outer diameters of the second lens barrel, the change in effective focal length when the refractive power changes, and the moving distance of the second element group, the zoom mechanism of the VR visual system can be optimized. The image field curvature distribution is uniform and the difference is small, with low dispersion, thereby ensuring the stability and continuity of the image. At the same time, it ensures that the first lens barrel has sufficient structural strength and stability, so that the VR visual system can withstand the stress and deformation generated during zooming, reducing mechanical errors and wear, and improving the service life of the VR visual system.

[0069] This embodiment may also include other parametric expressions from the first embodiment, which will not be elaborated here.

[0070] 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.

[0071] 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.

[0072] 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 accompanying drawings also indicate parameters such as das to provide a clear and intuitive understanding of their meaning. To facilitate the demonstration of the VR visual system structure and specific surface shapes, these parameters will not be shown in the subsequent descriptions of specific embodiments.

[0073] 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.

[0074] 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, with the image surface located on the display screen.

[0075] The following describes, with reference to the accompanying drawings, specific surface features and parameters of the VR visual system applicable to the above embodiments.

[0076] Example 1

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 through first quarter-wave plate QWP1 and first lens E1 in sequence 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 then exits after passing through reflective polarizer RP.

[0081] Table 1 shows the basic structural parameters of the VR visual system in Embodiment 1. In Table 1, the units of radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). In Table 1, 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.

[0082] Table 1

[0083] 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 10.0000 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 6.3697 1.639 23.52 refraction 5 Partial reflective element (BS) aspherical -47.9562 -6.3697 1.639 23.52 reflection 2.7419 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 6.3697 1.639 23.52 refraction 9 aspherical -47.9562 D2 refraction 2.7419 10 Second lens (E2) aspherical 29.5910 6.0000 1.544 55.92 refraction 4.5442 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

[0084] 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:

[0085]

[0086] 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 2 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.

[0087] Table 2

[0088] 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

[0089] 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 The second state is shown in Table 3. Some structural parameters of the VR visual system change. D1 represents the virtual image distance of the VR visual system in this embodiment, and D2 represents the distance on the optical axis from the second side of the first lens to the first side of the second lens. When D1 and D2 are positive, the direction is from the first side to the second side, and when they are negative, the direction is from the second side to the first side. The units of D1 and D2 are both millimeters (mm).

[0090] Table 3

[0091] Status / Parameters D1 D2 First state 500.0000 2.1069 Second state -200.0000 1.0000

[0092] Figure 9 and Figure 10 The 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.

[0093] Example 2

[0094] like Figures 5 to 6 As shown, a VR viewing system according to Embodiment 2 of this application is described. Figure 5 and Figure 6The 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.

[0095] Example 3

[0096] 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.

[0097] Example 4

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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 through first quarter-wave plate QWP1 and first lens E1 in sequence 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 then exits after passing through reflective polarizer RP.

[0102] Table 4 shows the basic structural parameters of the VR visual system in Embodiment 4. In Table 4, the units of radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). In Table 4, 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.

[0103] Table 4

[0104]

[0105]

[0106] Table 5 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.

[0107] Table 5

[0108] Face number 9 10 A4 5.7070E-06 3.3403E-05 A6 -7.2912E-09 -2.6483E-07 A8 1.2163E-10 1.6918E-09 A10 -4.1072E-13 0.0000E+00 A12 5.2266E-16 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

[0109] In this embodiment, moving the second element group changes the refractive power of the VR visual system, enabling the system to switch from... Figure 11The first state transition shown is to Figure 12 The second state is shown in Table 6. Some structural parameters of the VR visual system change. D1 represents the virtual image distance of the VR visual system in this embodiment, and D2 represents the distance on the optical axis from the second side of the first lens to the first side of the second lens. When D1 and D2 are positive, the direction is from the first side to the second side, and when they are negative, the direction is from the second side to the first side. The units of D1 and D2 are both millimeters (mm).

[0110] Table 6

[0111] Status / Parameters D1 D2 First state 500.0000 2.1933 Second state -200.0000 1.0000

[0112] 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.

[0113] Example 5

[0114] 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.

[0115] Example 6

[0116] 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.

[0117] Example 7

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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 through first quarter-wave plate QWP1 and first lens E1 in sequence 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 then exits after passing through reflective polarizer RP.

[0122] Table 8 shows the basic structural parameters of the VR visual system of Embodiment 7, where the units of radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). In Table 7, light from the image surface IMG propagates from surface number 14 to the side of surface number 1, and refraction / reflection refers to the refraction or reflection of light by that surface during this passage.

[0123] Table 7

[0124]

[0125]

[0126] Table 8 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.

[0127] Table 8

[0128] surface 9 10 A4 2.8237E-06 2.8805E-05 A6 -4.0411E-09 -2.3764E-07 A8 2.4381E-11 7.0914E-10 A10 -3.7137E-14 0.0000E+00 A12 2.1215E-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

[0129] 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 The second state is shown in Table 9. Some structural parameters of the VR visual system change. D1 represents the virtual image distance of the VR visual system in this embodiment, and D2 represents the distance on the optical axis from the second side of the first lens to the first side of the second lens. When D1 and D2 are positive, the direction is from the first side to the second side, and when they are negative, the direction is from the second side to the first side. The units of D1 and D2 are both millimeters (mm).

[0130] Table 9

[0131] Status / Parameters D1 D2 First state 500.0000 2.7364 Second state -200.0000 1.0000

[0132] 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.

[0133] Example 8

[0134] 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.

[0135] Example 9

[0136] like Figures 23 to 24 As shown, a VR visual system according to Embodiment Nine of this application is described. Figure 23 and Figure 24 The 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.

[0137] In summary, embodiments one through nine of the VR visual system satisfy the relationships shown in Table 10. Specifically, the conditional values ​​of the first and second states corresponding to each embodiment of the VR visual system are identical.

[0138] Table 10

[0139] Conditional / Example 1 2 3 4 5 6 7 8 9 fz2 / dbs 1.85 1.84 2.11 2.14 2.13 2.75 3.78 3.81 4.71 |Dbs-Dbm| / ΔL 4.09 5.32 1.01 3.79 3.78 2.85 2.61 2.61 2.08 La / Δf 27.86 24.27 28.55 32.83 40.80 35.36 45.27 47.51 46.76 Lb / ΔL 5.90 5.71 5.41 7.01 7.44 4.86 5.06 5.43 3.52 (Das+Dam) / fz1 1.05 1.12 1.05 0.88 0.91 0.89 1.25 1.25 1.15 La / (f1 / R2)(mm) -4.10 -3.57 -4.20 -3.99 -4.95 -4.29 -6.23 -6.54 -6.44 f2 / (dbs+dbm) 1.11 1.14 0.94 1.36 1.37 1.14 2.23 2.23 2.02 EPD / |das-dam| 0.30 0.42 0.32 0.35 0.64 0.38 0.23 0.81 0.29 (R3 / N2) / Dbs 0.58 0.57 0.56 0.67 0.67 0.69 1.22 1.23 1.27 dam / (CT1×N1) 3.64 2.81 3.59 4.28 3.58 4.24 3.50 3.09 3.25 Das / V1(mm) 1.62 1.80 1.63 1.39 1.63 1.43 1.21 1.29 1.09 Lb / (f2 / V2) 6.74 6.52 6.17 6.41 6.80 4.44 3.10 3.33 2.16 |Dbs-dbm| / CT2 2.30 2.58 0.27 2.07 2.19 0.07 1.87 1.77 0.10 Δf×(dbs / dbm)(mm) 0.35 0.38 0.18 0.33 0.34 0.13 0.24 0.23 0.12 Dbs / Lb 5.09 5.29 5.66 4.56 4.34 6.38 5.22 4.83 7.19

[0140] Table 11 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.

[0141] Table 11

[0142] Parameters / Examples 1 2 3 4 5 6 7 8 9 f1 75.03 75.03 75.03 78.70 78.70 78.70 82.27 82.27 82.27 f2 54.40 54.40 54.40 72.80 72.80 72.80 158.73 158.73 158.73 fz1 75.03 75.03 75.03 78.70 78.70 78.70 82.27 82.27 82.27 fz2 54.40 54.40 54.40 72.80 72.80 72.80 158.73 158.73 158.73 EPD 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 ΔL 1.11 1.11 1.11 1.19 1.19 1.19 1.74 1.74 1.74 Δf 0.23 0.23 0.23 0.19 0.19 0.19 0.17 0.17 0.17

[0143] Table 12 shows some structural parameters of the VR visual systems of Examples 1 to 9, in mm.

[0144] Table 12

[0145] Parameters / Examples 1 2 3 4 5 6 7 8 9 das 24.565 38.892 25.092 22.296 34.358 22.843 33.194 49.714 33.244 dam 38.023 29.296 37.432 33.585 28.101 33.276 50.603 44.790 47.074 Das 38.144 42.229 38.447 32.707 38.358 33.661 49.525 52.714 44.684 Dam 40.755 41.590 40.164 36.317 33.513 36.008 53.335 50.202 49.806 dbs 29.332 29.536 25.738 34.040 34.242 26.506 41.976 41.615 33.678 dbm 19.544 18.054 32.362 19.437 18.762 37.581 29.154 29.698 44.967 Dbs 33.332 33.549 33.982 38.040 38.473 36.917 45.976 45.615 44.089 Dbm 28.804 27.657 35.095 33.513 33.963 40.314 41.449 41.087 47.699 La 6.407 5.583 6.567 6.237 7.752 6.718 7.696 8.077 7.949 Lb 6.554 6.340 6.000 8.347 8.857 5.784 8.807 9.440 6.130

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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 to move closer to or further away from the first component group. 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, a first lens, and a partially reflective element. 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; Wherein, the combined focal length fz2 of the second lens, the second quarter-wave plate and the polarizer, and the inner diameter dbs of the first side of the second lens barrel satisfy the following: 1.84≤fz2 / dbs≤4.71; 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: 1.01≤|Dbs-Dbm| / ΔL≤5.

32.

2. The VR visual system according to claim 1, characterized in that, 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, and the change Δf of the effective focal length of the VR visual system when the refractive power of the VR visual system changes from +2D to -5D, satisfy the following: 24.27≤La / Δf≤47.

51.

3. The VR visual system according to claim 1, characterized in that, The maximum thickness Lb from the first side of the second lens barrel to the second side of the second lens barrel along the optical axis, 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: 3.52≤Lb / ΔL≤7.

44.

4. The VR visual system according to claim 1, characterized in that, The outer diameter Das of the first side of the first lens barrel, the outer diameter Dam of the second side of the first lens barrel, the combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens satisfy the following condition: 0.88≤(Das+Dam) / fz1≤1.

25.

5. The VR visual system according to claim 1, characterized in that, 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, the effective focal length f1 of the first lens, and the radius of curvature R2 of the second side surface of the first lens satisfy the following: -6.55mm < La / (f1 / R2) < -3.55mm.

6. The VR visual system according to claim 1, characterized in that, The effective focal length f2 of the second lens, the inner diameter dbs of the first side of the second lens barrel, and the inner diameter dbm of the second side of the second lens barrel satisfy the following condition: 0.94≤f2 / (dbs+dbm)≤2.

23.

7. The VR visual system according to claim 1, characterized in that, The inner diameter das of the first side of the first lens barrel, the inner diameter dam of the second side of the first lens barrel, and the entrance pupil diameter EPD of the VR visual system satisfy the following: 0.23≤EPD / |das-dam|≤0.

81.

8. The VR visual system according to claim 1, characterized in that, The radius of curvature R3 of the first side of the second lens, the refractive index N2 of the second lens, and the outer diameter Dbs of the first side of the second lens barrel satisfy the following condition: 0.56≤(R3 / N2) / Dbs≤1.

27.

9. The VR visual system according to claim 1, characterized in that, The inner diameter dam of the second side of the first lens barrel, the center thickness CT1 of the first lens on the optical axis, and the refractive index N1 of the first lens satisfy the following condition: 2.8 < dam / (CT1×N1) < 4.

3.

10. The VR visual system according to claim 1, characterized in that, The outer diameter Das of the first side of the first lens barrel and the dispersion coefficient V1 of the first lens satisfy the following condition: 1.09mm≤Das / V1≤1.80mm.

11. The VR visual system according to claim 1, characterized in that, The maximum thickness Lb from the first side of the second lens barrel to the second side of the second lens barrel along the optical axis, the effective focal length f2 of the second lens, and the dispersion coefficient V2 of the second lens satisfy the following condition: 2.16≤Lb / (f2 / V2)≤6.

80.

12. 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 inner diameter dbm of the second side of the second lens barrel, and the center thickness CT2 of the second lens on the optical axis satisfy the following: 0.07≤|Dbs-dbm| / CT2≤2.

58.

13. The VR visual system according to claim 1, characterized in that, When the refractive power of the VR visual system changes from +2D to -5D, the change in the effective focal length Δf of the VR visual system, the inner diameter dbs of the first side of the second lens barrel, and the inner diameter dbm of the second side of the second lens barrel satisfy the following condition: 0.1mm < Δf × (dbs / dbm) < 0.4mm.

14. The VR visual system according to claim 1, characterized in that, The outer diameter Dbs of the first side of the second lens barrel and the maximum thickness Lb of the second side of the second lens barrel along the optical axis satisfy the following: 4.34≤Dbs / Lb≤7.19.

Images