VR visual system

Abstract

The invention provides a VR visual system which 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 an optical axis of the VR visual system, and the second element group can move in the direction of the 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] The present invention relates to the technical field of head-mounted devices, and in particular to a VR visual system. Background Art

[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 them, diopter adjustment, as one of the key technologies to improve the applicability and user experience of VR visual systems, is receiving more and more attention. Although the VR visual systems on the market have made significant progress in visual experience, the existing VR visual systems have the problem of insufficient diopter adjustment, especially for users with significant differences in vision such as myopia and hyperopia. The existing VR visual systems often cannot provide sufficient diopter adjustment range. At the same time, when adjusting the diopter, the image field curvature of the VR visual system is highly discrete, and the image clarity is poor. 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 diopter adjustment range while maintaining clear imaging is a very important issue. Summary of the invention

[0003] The main purpose of the present invention is to provide a VR visual system to solve the problem in the prior art that it is difficult to achieve both a large diopter adjustment range and high imaging clarity in the VR visual system.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a VR visual system is provided, the VR visual system comprising: an element group, the element group including a first element group and a second element group in sequence from the first side to the second side along the optical axis of the VR visual system, the second element group can move along the direction of the optical axis to approach or move 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 reflecting 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 a plane, and a second side surface of the first lens being a convex surface, the second element group including at least a second lens, a second quarter wave plate, a polarizing plate and a display along the optical axis from the first side to the second side, the second lens It has positive focal power, the first side surface of the second lens is convex, and the second side surface of the second lens is flat; a barrel group, the barrel group includes a first barrel and a second barrel, the first element group is accommodated in the first barrel, and the second element group is accommodated in the second 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 surface of the second barrel satisfy: 1.84≤fz2 / dbs≤4.71; the outer diameter Dbs of the first side surface of the second barrel, the outer diameter Dbm of the second side surface of the second barrel, and the distance ΔL moved by the second element group 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.

[0005] According to another aspect of the present invention, a VR visual system is provided, and the VR visual system includes: an element group, the element group includes a first element group and a second element group in sequence from the first side to the second side along the optical axis of the VR visual system, the second element group can move along the direction of the optical axis to approach or move away from the first element group, the first element group includes at least a reflective polarizing element, a first quarter wave plate, a first lens and a partial reflective element along the optical axis from the first side to the second side, the first lens has positive optical power, the first side surface of the first lens is a plane, and the second side surface of the first lens is a convex surface, the second element group includes 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 has positive optical power, and the first side surface of the second lens is a convex surface , the second side surface of the second lens is a plane; a barrel group, the barrel group includes a first barrel and a second barrel, the first element group is accommodated in the first barrel, and the second element group is accommodated in the second barrel; wherein, a maximum thickness La from the first side surface of the first barrel to the second side surface of the first barrel along the optical axis, and a change Δf of an effective focal length of the VR visual system when the diopter of the VR visual system changes from +2D to -5D satisfy: 24.27≤La / Δf≤47.51; an outer diameter Dbs of the first side surface of the second barrel, an outer diameter Dbm of the second side surface of the second barrel, and a distance ΔL moved by the second element group along the optical axis when the diopter 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 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.

[0007] Furthermore, the maximum thickness Lb from the first side surface of the second lens barrel to the second side surface 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: 3.52≤Lb / ΔL≤7.44.

[0008] Furthermore, the outer diameter Das of the first side surface of the first lens barrel, the outer diameter Dam of the second side surface of the first lens barrel, the reflective polarizing element, the first quarter wave plate and the combined focal length fz1 of the first lens satisfy: 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 curvature radius R2 of the second side surface of the first lens satisfy: -6.55mm<La / (f1 / R2)<-3.55mm.

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

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

[0012] Furthermore, the curvature radius 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: 0.56≤(R3 / N2) / Dbs≤1.27.

[0013] Furthermore, the inner diameter dam of the second side surface 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: 2.8<dam / (CT1×N1)<4.3.

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

[0015] Furthermore, the maximum thickness Lb from the first side surface of the second lens barrel to the second side surface 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: 2.16≤Lb / (f2 / V2)≤6.80.

[0016] Further, an outer diameter Dbs of the first side surface of the second lens barrel, an inner diameter dbm of the second side surface of the second lens barrel, and a center thickness CT2 of the second lens on the optical axis satisfy: 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 relationship: 0.1mm<Δf×(dbs / dbm)<0.4mm.

[0018] Further, an outer diameter Dbs of the first side surface of the second lens barrel and a maximum thickness Lb from the first side surface of the second lens barrel to the second side surface of the second lens barrel along the direction of the optical axis satisfy: 4.34≤Dbs / Lb≤7.19.

[0019] According to the technical solution of the present invention, a VR visual system includes an element group and a lens barrel group. The element group includes a first element group and a second element group in sequence from the first side to the second side along the optical axis of the VR visual system. The second element group can move along the direction of the optical axis to approach or move away from the first element group. The first element group includes at least a reflective polarizing element, a first quarter wave plate, a first lens and a partial reflective element along the optical axis from the first side to the second side. The first lens has positive optical power. The first side surface of the first lens is a plane, and the second side surface of the first lens is a convex surface. The second element group includes at least a second lens, a second quarter wave plate, a polarizing plate and a display along the optical axis from the first side to the second side. The second lens has positive optical power. The first side surface of the second lens is a convex surface, and the second side surface of the second lens is a plane; the lens barrel group includes a first lens barrel and a second lens barrel, the first element group is accommodated in the first lens barrel, and the second element group is accommodated 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 surface of the second lens barrel satisfy: 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 moved by the second element group 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.

[0020] The VR visual system of the present application is provided with a first element group 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 along the optical axis, and the first element group and the second element group are respectively arranged in the first lens barrel and the second lens barrel, wherein the second lens barrel and the second element group move along the direction of the optical axis as a whole to adjust the diopter 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 of the VR visual system, the inner and outer diameter dimensions of the second lens barrel, and the moving distance of the second element group when the diopter changes, the zoom mechanism of the VR visual system can be optimized, so that the distribution of the image field curvature of the VR visual system during the zoom process is uniform and the difference is small, and the discrete degree is low, thereby ensuring the stability and continuity of the image. At the same time, it helps to reduce mechanical errors and wear during the zoom process, and improves the service life of the VR visual system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

[0023] Figure 2 Shows Figure 1 Schematic diagram of parameters of the VR visual system in the second state;

[0024] Figure 3 to Figure 4 It shows a schematic structural diagram of a VR visual system in a first state and a second state according to a first embodiment of the present invention;

[0025] Figures 5 and 6 A schematic diagram showing the structure of a VR visual system in a first state and a second state according to a second embodiment of the present invention is shown;

[0026] Figures 7 and 8 It shows a schematic diagram of the structure of the VR visual system in the first state and the second state according to the third embodiment of the present invention;

[0027] Figures 9 and 10 MTF curves of the VR visual system in the first state and the second state according to the first embodiment of the present invention are shown respectively;

[0028] Figure 11 to Figure 12 It shows a schematic diagram of the structure of the VR visual system in the first state and the second state according to the fourth embodiment of the present invention;

[0029] Figure 13 to Figure 14 It shows a schematic diagram of the structure of the VR visual system in the first state and the second state according to the fifth embodiment of the present invention;

[0030] Figure 15 to Figure 16 It shows a schematic diagram of the structure of the VR visual system in the first state and the second state according to the sixth embodiment of the present invention;

[0031] Figure 17 to Figure 18 MTF curves of the VR visual system of the fourth embodiment of the present invention in the first state and the second state are shown respectively;

[0032] Figure 19 to Figure 20 It shows a schematic diagram of the structure of the VR visual system of the seventh embodiment of the present invention in the first state and the second state;

[0033] Figure 21 to Figure 22 It shows a schematic diagram of the structure of the VR visual system in the first state and the second state according to the eighth embodiment of the present invention;

[0034] Figure 23 to Figure 24 It shows a schematic diagram of the structure of the VR visual system of Embodiment 9 of the present invention in the first state and the second state;

[0035] Figure 25 to Figure 26The MTF curves of the VR visual system of the seventh embodiment of the present invention in the first state and the second state are shown respectively;

[0036] Fig. 27 A defocus curve diagram of a VR visual system according to an optional embodiment of the present invention under the conditions of fz2 / dbs=2.75, |Dbs-Dbm| / ΔL=2.85 is shown;

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

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

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

[0040] RP, reflective polarizing element; QWP1, first quarter wave plate; E1, first lens; BS, partial reflection element; E2, second lens; QWP2, second quarter wave plate; LP, polarizing plate; Pa, first lens barrel; Pb, second lens barrel; IMG, image plane. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0043] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0044] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0045] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0046] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of ordinary knowledgeable people in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the eye-side surface, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the display-side surface, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0047] In order to solve the problem in the prior art that it is difficult to achieve both a large diopter adjustment range and high definition in VR visual systems, the present invention provides a VR visual system.

[0048] First embodiment

[0049] like Figures 1 to 27 As shown, the VR visual system includes an element group and a lens barrel group, the element group includes a first element group and a second element group in sequence from the first side to the second side along the optical axis of the VR visual system, the second element group can move along the direction of the optical axis to approach or move away from the first element group, the first element group includes at least a reflective polarizing element, a first quarter wave plate, a first lens and a partial reflective element along the optical axis from the first side to the second side, the first lens has positive optical power, the first side surface of the first lens is a plane, and the second side surface of the first lens is a convex surface, the second element group includes 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 has positive optical power, and the second lens The first side surface of the second lens is a convex surface, and the second side surface of the second lens is a plane; the lens barrel group includes a first lens barrel and a second lens barrel, the first element group is accommodated in the first lens barrel, and the second element group is accommodated 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 surface of the second lens barrel satisfy: 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 moved by the second element group 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.

[0050] The VR visual system of the present application is provided with a first element group 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 along the optical axis, and the first element group and the second element group are respectively arranged in the first lens barrel and the second lens barrel, wherein the second lens barrel and the second element group move along the direction of the optical axis as a whole to adjust the diopter 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 of the VR visual system, the inner and outer diameter dimensions of the second lens barrel, and the moving distance of the second element group when the diopter changes, the zoom mechanism of the VR visual system can be optimized, so that the distribution of the image field curvature of the VR visual system during the zoom process is uniform and the difference is small, and the discrete degree is low, thereby ensuring the stability and continuity of the image. At the same time, it helps to reduce mechanical errors and wear during the zoom process, and improves the service life of the VR visual system.

[0051] like Fig.28 As shown in FIG. 1 , the defocus curve of the VR visual system of comparative example 1 under the conditions of fz2 / dbs=5.1 and |Dbs-Dbm| / ΔL=5.5 is given. Under different defocus values, the defocus curves are seriously offset, and the imaging performance of the VR visual system is poor. Fig.29 As shown, the defocus curve of the VR visual system of comparative example 2 under the conditions of fz2 / dbs=1.5, |Dbs-Dbm| / ΔL=0.8 is given. The defocus curves under different defocus amounts also have a large offset, and the imaging performance of the VR visual system is poor.

[0052] The VR visual system of the present invention can achieve higher imaging performance by controlling 1.84≤fz2 / dbs≤4.71 and 1.01≤|Dbs-Dbm| / ΔL≤5.32, for example Fig. 27 An optional embodiment is shown. Under the conditions of fz2 / dbs=2.75 and |Dbs-Dbm| / ΔL=2.85, the degree of deviation of the defocus curve is very small, indicating that the VR visual system can achieve a relatively ideal imaging effect.

[0053] In this embodiment, the maximum thickness La from the first side surface of the first lens barrel to the second side surface of the first lens barrel in the direction of the optical axis and the change Δf of the effective focal length of the VR visual system when the diopter of the VR visual system changes from +2D to -5D satisfy the following conditions: 24.27≤La / Δf≤47.51. By limiting La / Δf within a reasonable range, it is possible to ensure that the first lens barrel has sufficient structural strength and stability to withstand the stress and deformation generated when the focal length changes, thereby avoiding the first lens barrel being too thick to increase material costs and manufacturing difficulties, and also avoiding the first lens barrel being too thin to meet the structural strength and optical performance requirements of the VR visual system.

[0054] In this embodiment, the maximum thickness Lb from the first side of the second lens barrel to the second side of the second lens barrel in the direction of the optical axis and the distance ΔL that the second element group moves along the optical axis when the diopter of the VR visual system changes from +2D to -5D satisfy: 3.52≤Lb / ΔL≤7.44. By limiting Lb / ΔL within a reasonable range, the second element group is allowed to move along the optical axis when it changes within a certain focal length range, and the VR visual system can adapt to different observation distances and display image sizes to ensure the zoom function, and the appropriate thickness of the second lens barrel helps to reduce the optical aberration of the VR visual system and improve the imaging quality of the VR visual system.

[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 reflective polarizing element, the first quarter wave plate and the combined focal length fz1 of the first lens satisfy the following relationship: 0.88≤(Das+Dam) / fz1≤1.25. By limiting (Das+Dam) / fz1 within a reasonable range and constraining the relationship between the outer diameter of the first lens barrel and the combined focal length of the first element, the performance of the VR visual system can be ensured to be stable, and the outer diameter of the first lens barrel is prevented from being too small compared to the combined focal length of the first element, which leads to increased processing difficulty or insufficient space, affecting the transmission and focusing effect of light, and the outer diameter of the first lens barrel is prevented from being too large compared to the combined focal length of the first element, which leads to the first lens barrel being too bulky, which is not conducive to the lightweight and miniaturization of the VR visual system.

[0056] In this embodiment, 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 curvature radius R2 of the second side surface of the first lens satisfy: -6.55mm<La / (f1 / R2)<-3.55mm. By limiting La / (f1 / R2) within a reasonable range, the curvature radius 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 the light can be correctly focused with minimal aberration loss when passing through the first lens, so as to optimize the imaging clarity of the VR visual system, and also enable the VR visual system to reduce aberrations and distortions 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 relationship: 0.94≤f2 / (dbs+dbm)≤2.23. By limiting f2 / (dbs+dbm) within a reasonable range, the transmission path of the light in the second lens barrel can be optimized, ensuring that the light can be effectively focused when passing through the second lens, and that the light can efficiently pass through the second lens barrel, avoiding the increase of light loss and stray light due to improper setting of the inner diameter size 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: 0.23≤EPD / |das-dam|≤0.81. By limiting EPD / |das-dam| within a reasonable range, it helps to ensure the inner diameter dimensional stability of the first lens barrel during manufacturing and use under the premise of stable EPD, thereby improving the stability and durability of the VR visual system, and can also achieve the compactness of the first lens barrel structure, which helps to reduce the size and weight of the VR visual system and improve 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 relationship: 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, that is, the focusing performance of the light when passing through the second lens is optimized, and spherical aberration and chromatic aberration are reduced. At the same time, the constraint (R3 / N2) / Dbs ensures the matching degree between the second lens and the lens barrel, so that the light can effectively pass through the lens barrel after being focused by the two lenses, reducing light loss and stray light, and also ensuring that the second lens barrel has a smaller outer diameter while maintaining sufficient strength and stability, 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 relationship: 2.8<dam / (CT1×N1)<4.3. By limiting dam / (CT1×N1) within a reasonable range, not only the size matching and structural stability between the first lens and the first lens barrel are ensured, but also the optical focusing efficiency can be improved, the aberration can be reduced, and the imaging quality and user experience of the VR visual system can be significantly enhanced. It also helps the VR visual system to achieve smooth transition and stable imaging during zooming, ensuring that the relative position between the first lens and the first lens barrel can be kept stable when adjusting the focal length, thereby avoiding a sharp drop 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: 1.09mm≤Das / V1≤1.80mm. By limiting Das / V1 within a reasonable range, it not only helps to achieve effective correction of chromatic aberration and ensure 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. In addition, the design flexibility of the VR visual system is increased, and the appropriate lens material and lens barrel size can be selected according to specific applications and cost requirements, thereby improving the market competitiveness of the VR visual system.

[0062] In this embodiment, the maximum thickness Lb from the first side surface of the second lens barrel to the second side surface 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: 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 the structural strength, reducing the imaging errors caused by factors such as temperature changes and vibrations, and ensuring that 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: 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 in the second lens barrel, while reducing assembly errors and performance degradation caused by size mismatch. In addition, constraining |Dbs-dbm| / CT2 can also ensure the structural stability and optical focusing ability of the VR visual system during zooming, improving the long-term experience of users.

[0064] In this embodiment, when the diopter of the VR visual system changes from +2D to -5D, the change in the effective focal length of the VR visual system Δf, 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 conditions: 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 to cause assembly difficulties nor too loose to affect stability. In addition, constraining Δf×(dbs / dbm) can also ensure the coordination between the zoom performance of the VR visual system and the inner diameter size of the second lens barrel, reduce the problems of aberration and poor stability caused by improper adjustment of the position of optical elements, and thus significantly improve 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 from the first side of the second lens barrel to the second side of the second lens barrel along the optical axis satisfy: 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 embodiment

[0067] like Figures 1 to 27As shown, the VR visual system includes an element group and a lens barrel group, the element group includes a first element group and a second element group in sequence from the first side to the second side along the optical axis of the VR visual system, the second element group can move along the direction of the optical axis to approach or move away from the first element group, the first element group includes at least a reflective polarizing element, a first quarter wave plate, a first lens and a partial reflective element along the optical axis from the first side to the second side, the first lens has positive optical power, the first side surface of the first lens is a plane, and the second side surface of the first lens is a convex surface, the second element group includes 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 has positive optical power, the first side surface of the second lens is a convex surface, and the second lens has a positive optical power. The second side surface is a plane; the lens barrel group includes a first lens barrel and a second lens barrel, the first element group is accommodated in the first lens barrel, and the second element group is accommodated in the second lens barrel; wherein, 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: 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 moved by the second element group 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 the present application is provided with a first element group 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 along the optical axis, and the first element group and the second element group are respectively arranged in the first lens barrel and the second lens barrel, wherein the second lens barrel and the second element group move along the direction of the optical axis as a whole to adjust the diopter 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 diameter dimensions of the second lens barrel, the change of the effective focal length when the diopter changes, and the moving distance of the second element group, the zoom mechanism of the VR visual system can be optimized, and the image field curvature is evenly distributed with small differences and low discreteness, thereby ensuring the stability and continuity of the image. At the same time, it is ensured 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 the zoom process, reduce mechanical errors and wear, and improve the service life of the VR visual system.

[0069] This embodiment may also include other parameter formulas in the first embodiment, which will not be described in detail here.

[0070] In the present application, the mirror surface of at least one of the first lens and the second lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0071] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the VR visual system can be changed to obtain the various results and advantages described in this specification. For example, although two lenses are described as an example in the embodiment, 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 schematic diagrams of the structure of a VR visual system of the present application in a first state and a second state are respectively shown. Figure 1 and Figure 2 Parameters such as das are also indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the display of the VR visual system structure and the specific face shape, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0073] It should be noted that the movement of the second element group of the VR visual system along the optical axis close to the first element group brings about a change in diopter. The diopter of the VR visual system is +2D in the first state and -5D in the second state. Among them, in the first state, it means that the VR visual system is suitable for users with a hyperopia of 200 degrees, and in the second state, it means 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 state and the second state, and the diopter of the VR visual system in other states can be between +2D and -5D.

[0074] It should be noted that the first side refers to the human eye side, the second side refers to the display side, and the image plane is located on the display.

[0075] The following further describes examples of specific face shapes and parameters of the VR visual system applicable to the above-mentioned implementation mode with reference to the accompanying drawings.

[0076] Embodiment 1

[0077] like Figure 3 to Figure 4 As shown, the structures of the VR visual system in the first state and the second state of embodiment 1 of the present application are described respectively.

[0078] like Figure 3 to Figure 4 As shown, the first element group is accommodated in the first lens barrel Pa, the second element group is accommodated in the second lens barrel Pb, and the VR visual system includes a reflective polarizing element RP, a first quarter wave plate QWP1, a first lens E1, a partial reflection element BS, a second lens E2, a second quarter wave plate QWP2, and a polarizing plate LP in sequence from the first side to the second side. It should be noted that, in this embodiment, the first side end of the first lens barrel Pa extends in the direction of the optical axis so that the first side surface of the reflective polarizing element RP bears on the first lens barrel Pa, and therefore, the reflective polarizing element RP, the first quarter wave plate QWP1, the first lens E1, and the partial reflection element BS are assembled from the second side of the first lens barrel Pa; at the same time, the second side end of the second lens barrel Pb extends in the direction of the optical axis so that the second side surface of the second lens bears on the second lens barrel Pb, and therefore, the second lens E2, the second quarter wave plate QWP2, and the polarizing plate LP are assembled from the first side of the second lens barrel Pb.

[0079] In this embodiment, the first lens has positive focal power, the first side surface of the first lens is a plane, the second side surface of the first lens is a convex surface, the second lens has positive focal power, the first side surface of the second lens is a convex surface, and the second side surface of the second lens is a plane. The VR visual system further has an aperture located between the first side and the first element group, the second side surface of the reflective polarizing element is bonded to the first side surface of the first quarter wave plate, the second side surface of the first quarter wave plate is bonded to at least part of the first side surface of the first lens, the first side surface of the partial reflective element is bonded to at least part of the second side surface of the first lens; the first side surface of the second quarter wave plate is bonded to at least part of the second side surface of the second lens, the second side surface of the second quarter wave plate is bonded to the first side surface of the polarizing plate, and the first side surface of the image surface is bonded to at least part of the second side surface of the polarizing plate.

[0080] In this embodiment, the light from the image surface IMG passes through the polarizer LP, the second quarter-wave plate QWP2, the second lens E2, the first lens E1, and the first quarter-wave plate QWP1 to reach the reflective polarizing element RP. After being reflected by the reflective polarizing element RP, the light passes through the first quarter-wave plate QWP1 and the first lens E1 in sequence to reach the partially reflecting element BS on the second side surface of the first lens. After being reflected by the partially reflecting element BS, the light returns to the first lens E1 and the first quarter-wave plate QWP1, and passes through the reflective polarizing element RP to be emitted.

[0081] Table 1 shows the basic structural parameter table of the VR visual system of Example 1, wherein the units of the curvature radius, thickness / distance, and effective focal length are all in millimeters (mm). In Table 1, the light from the image surface IMG propagates from surface number 14 to the side of surface number 1, and the refraction / reflection refers to the refraction or reflection effect of the surface on the light during this passage.

[0082] Table 1

[0083] Face number Surface type Radius of curvature thickness Refractive Index Dispersion coefficient Refraction / Reflection Cone coefficient Spherical endless D1 refraction 1 Aperture (STO) Spherical endless 10.0000 refraction 2 Reflective polarizer (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 Partially reflective element (BS) Aspheric -47.9562 -6.3697 1.639 23.52 reflection 2.7419 6 Spherical endless -0.1000 1.517 64.17 refraction 7 Reflective polarizer (RP) Spherical endless 0.1000 1.517 64.17 reflection 8 First lens (E1) Spherical endless 6.3697 1.639 23.52 refraction 9 Aspheric -47.9562 D2 refraction 2.7419 10 Second lens (E2) Aspheric 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 Polarizer(LP) Spherical endless 0.1000 1.517 64.17 refraction 13 Spherical endless 0.0000 refraction 14 Image surface (IMG) Spherical endless 0.0000 refraction

[0084] In the first embodiment, the second side surface of the first lens and the first side surface of the second lens are aspherical surfaces, and the surface shape of the aspherical surface can be defined by but not limited to the following aspherical surface formula:

[0085]

[0086] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in the above Table 1; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 2 gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the aspheric 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, the second element group is moved to change the diopter of the VR visual system, which can be achieved by Figure 3 The first state shown transitions to Figure 4 As shown in Table 3, some structural parameters of the VR visual system have changed, where D1 represents the value of the virtual image distance of the VR visual system of this embodiment, D2 represents the distance from the second side surface of the first lens to the first side surface of the second lens on the optical axis, when D1 and D2 are positive values, it indicates that the direction points from the first side to the second side, and when they are negative values, it indicates that the direction points from the second side to the first side, and 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] Fig. 9 and Fig.10 The MTF curves of the VR visual system of Example 1 in the first state and the second state are shown. The MTF values ​​under the light of each field of view are all above 0.7, showing good imaging quality.

[0093] Embodiment 2

[0094] like Figures 5 and 6 As shown, the VR visual system of embodiment 2 of the present application is described. Figure 5 and Figure 6The first state and the second state of the VR visual system of Example 2 are described respectively. The VR visual system of this embodiment has the same optical parameters as those of Example 1, but different structural parameters. Please refer to the relevant description in Example 1, which will not be repeated here.

[0095] Embodiment 3

[0096] like Figures 7 and 8 As shown, the VR visual system of embodiment 3 of the present application is described. Figure 7 and Figure 8 The first state and the second state of the VR visual system of Example 3 are described respectively. The VR visual system of this embodiment has the same optical parameters as those of Example 1, but different structural parameters. Please refer to the relevant description in Example 1, which will not be repeated here.

[0097] Embodiment 4

[0098] like Figure 11 to Figure 12 As shown, the structures of the first state and the second state of the VR visual system of Example 4 of the present application are respectively described.

[0099] like Figure 11 to Figure 12 As shown, the first element group is accommodated in the first lens barrel Pa, the second element group is accommodated in the second lens barrel Pb, and the VR visual system includes a reflective polarizing element RP, a first quarter wave plate QWP1, a first lens E1, a partial reflection element BS, a second lens E2, a second quarter wave plate QWP2, and a polarizing plate LP in sequence from the first side to the second side. It should be noted that, in this embodiment, the first side end of the first lens barrel Pa extends in the direction of the optical axis so that the first side surface of the reflective polarizing element RP bears on the first lens barrel Pa, and therefore, the reflective polarizing element RP, the first quarter wave plate QWP1, the first lens E1, and the partial reflection element BS are assembled from the second side of the first lens barrel Pa; at the same time, the second side end of the second lens barrel Pb extends in the direction of the optical axis so that the second side surface of the second lens bears on the second lens barrel Pb, and therefore, the second lens E2, the second quarter wave plate QWP2, and the polarizing plate LP are assembled from the first side of the second lens barrel Pb.

[0100] In this embodiment, the first lens has positive focal power, the first side surface of the first lens is a plane, the second side surface of the first lens is a convex surface, the second lens has positive focal power, the first side surface of the second lens is a convex surface, and the second side surface of the second lens is a plane. The VR visual system further has an aperture located between the first side and the first element group, the second side surface of the reflective polarizing element is bonded to the first side surface of the first quarter wave plate, the second side surface of the first quarter wave plate is bonded to at least part of the first side surface of the first lens, the first side surface of the partial reflective element is bonded to at least part of the second side surface of the first lens; the first side surface of the second quarter wave plate is bonded to at least part of the second side surface of the second lens, the second side surface of the second quarter wave plate is bonded to the first side surface of the polarizing plate, and the first side surface of the image surface is bonded to at least part of the second side surface of the polarizing plate.

[0101] In this embodiment, the light from the image surface IMG passes through the polarizer LP, the second quarter-wave plate QWP2, the second lens E2, the first lens E1, and the first quarter-wave plate QWP1 to reach the reflective polarizing element RP. After being reflected by the reflective polarizing element RP, the light passes through the first quarter-wave plate QWP1 and the first lens E1 in sequence to reach the partially reflecting element BS on the second side surface of the first lens. After being reflected by the partially reflecting element BS, the light returns to the first lens E1 and the first quarter-wave plate QWP1, and passes through the reflective polarizing element RP to be emitted.

[0102] Table 4 shows the basic structural parameter table of the VR visual system of Example 4, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all in millimeters (mm). In Table 4, the light from the image surface IMG propagates from surface number 14 to the side of surface number 1, and the refraction / reflection refers to the refraction or reflection effect of the surface on the light during this passage.

[0103] Table 4

[0104]

[0105]

[0106] Table 5 shows the high-order coefficients that can be used for each aspherical mirror surface in the embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. 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, the second element group is moved to change the diopter of the VR visual system, which can be achieved by Fig.11The first state shown transitions to Fig.12 As shown in Table 6, some structural parameters of the VR visual system have changed, where D1 represents the value of the virtual image distance of the VR visual system of this embodiment, and D2 represents the distance from the second side surface of the first lens to the first side surface of the second lens on the optical axis. When D1 and D2 are positive values, it indicates that the direction points from the first side to the second side, and when they are negative values, it indicates that the direction points 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] Fig.17 and Fig.18 The MTF curves of the VR visual system of Example 4 in the first state and the second state are shown. The MTF values ​​under the light of each field of view are all above 0.7, showing good imaging quality.

[0113] Embodiment 5

[0114] like Figure 13 to Figure 14 As shown, the VR visual system of embodiment 5 of the present application is described. Fig.13 and Fig.14 The first state and the second state of the VR visual system of Example 5 are described respectively. The VR visual system of this embodiment has the same optical parameters as those of Example 4, but different structural parameters. Please refer to the relevant description in Example 4, which will not be repeated here.

[0115] Embodiment 6

[0116] like Figure 15 to Figure 16 As shown, the VR visual system of embodiment 6 of the present application is described. Fig.15 and Fig.16 The first state and the second state of the VR visual system of Example 6 are described respectively. The VR visual system of this embodiment has the same optical parameters as those of Example 4, but different structural parameters. Please refer to the relevant description in Example 4, which will not be repeated here.

[0117] Embodiment 7

[0118] like Figure 19 to Figure 20 As shown, the structures of the first state and the second state of the VR visual system of Example 7 of the present application are respectively described.

[0119] like Figure 19 to Figure 20As shown, the first element group is accommodated in the first lens barrel Pa, the second element group is accommodated in the second lens barrel Pb, and the VR visual system includes a reflective polarizing element RP, a first quarter wave plate QWP1, a first lens E1, a partial reflection element BS, a second lens E2, a second quarter wave plate QWP2, and a polarizing plate LP in sequence from the first side to the second side. It should be noted that, in this embodiment, the first side end of the first lens barrel Pa extends in the direction of the optical axis so that the first side surface of the reflective polarizing element RP bears on the first lens barrel Pa, and therefore, the reflective polarizing element RP, the first quarter wave plate QWP1, the first lens E1, and the partial reflection element BS are assembled from the second side of the first lens barrel Pa; at the same time, the second side end of the second lens barrel Pb extends in the direction of the optical axis so that the second side surface of the second lens bears on the second lens barrel Pb, and therefore, the second lens E2, the second quarter wave plate QWP2, and the polarizing plate LP are assembled from the first side of the second lens barrel Pb.

[0120] In this embodiment, the first lens has positive focal power, the first side surface of the first lens is a plane, the second side surface of the first lens is a convex surface, the second lens has positive focal power, the first side surface of the second lens is a convex surface, and the second side surface of the second lens is a plane. The VR visual system further has an aperture located between the first side and the first element group, the second side surface of the reflective polarizing element is bonded to the first side surface of the first quarter wave plate, the second side surface of the first quarter wave plate is bonded to at least part of the first side surface of the first lens, the first side surface of the partial reflective element is bonded to at least part of the second side surface of the first lens; the first side surface of the second quarter wave plate is bonded to at least part of the second side surface of the second lens, the second side surface of the second quarter wave plate is bonded to the first side surface of the polarizing plate, and the first side surface of the image surface is bonded to at least part of the second side surface of the polarizing plate.

[0121] In this embodiment, the light from the image surface IMG passes through the polarizer LP, the second quarter-wave plate QWP2, the second lens E2, the first lens E1, and the first quarter-wave plate QWP1 to reach the reflective polarizing element RP. After being reflected by the reflective polarizing element RP, the light passes through the first quarter-wave plate QWP1 and the first lens E1 in sequence to reach the partially reflecting element BS on the second side surface of the first lens. After being reflected by the partially reflecting element BS, the light returns to the first lens E1 and the first quarter-wave plate QWP1, and passes through the reflective polarizing element RP to be emitted.

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

[0123] Table 7

[0124]

[0125]

[0126] Table 8 shows the coefficients of higher order terms that can be used for each aspherical mirror surface in the embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. 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, the second element group is moved to change the diopter of the VR visual system, which can be achieved by Fig.19 The first state shown transitions to Fig. 20 As shown in Table 9, some structural parameters of the VR visual system have changed, where D1 represents the value of the virtual image distance of the VR visual system of this embodiment, D2 represents the distance from the second side surface of the first lens to the first side surface of the second lens on the optical axis, when D1 and D2 are positive values, it indicates that the direction is from the first side to the second side, and when they are negative values, it indicates that the direction is from the second side to the first side, and 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] Fig.25 and Fig.26 The MTF curves of the VR visual system of Example 7 in the first state and the second state are shown. The MTF values ​​under the light of each field of view are all above 0.7, showing good imaging quality.

[0133] Embodiment 8

[0134] like Figure 21 to Figure 22 As shown, the VR visual system of embodiment eight of the present application is described. Figure 21 to Figure 22 The first state and the second state of the VR visual system of Example 8 are described respectively. The VR visual system of this embodiment has the same optical parameters as those of Example 7, but different structural parameters. Please refer to the relevant description in Example 7, which will not be repeated here.

[0135] Embodiment 9

[0136] like Figure 23 to Figure 24 As shown, the VR visual system of embodiment nine of the present application is described. Fig.23 and Fig.24 The first state and the second state of the VR visual system of Example 9 are described respectively. The VR visual system of this embodiment has the same optical parameters as those of Example 7, but different structural parameters. Please refer to the relevant description in Example 7, which will not be repeated here.

[0137] In summary, the first to ninth embodiments of the VR visual system respectively satisfy the relationship shown in Table 10. The conditional expressions of the first state and the second state corresponding to each embodiment of the VR visual system have the same values.

[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 lengths and some structural parameters of each lens and each element group of the VR vision system of Examples 1 to 9, in units of 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 gives some structural parameters of the VR visual system of Examples 1 to 9, in units of 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 above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0147] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0148] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0149] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A VR visual system, characterized in that: The VR visual system includes: An element group, the element group includes a first element group and a second element group in sequence from the first side to the second side along the optical axis of the VR visual system, the second element group can move along the direction of the optical axis to approach or move away from the first element group, the first element group includes at least a reflective polarizing element, a first quarter wave plate, a first lens and a partial reflective element along the optical axis from the first side to the second side, the first lens has positive optical power, the first side surface of the first lens is a plane, and the second side surface of the first lens is a convex surface, the second element group includes 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 has positive optical power, the first side surface of the second lens is a convex surface, and the second side surface of the second lens is a plane; A lens barrel group, the lens barrel group comprising a first lens barrel and a second lens barrel, the first element group is accommodated in the first lens barrel, and the second element group is accommodated 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 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.

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 direction of 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 surface of the second lens barrel to the second side surface 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: 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 surface of the first lens barrel, the outer diameter Dam of the second side surface 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: 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 direction of the optical axis, the effective focal length f1 of the first lens, and the curvature radius R2 of the second side surface of the first lens satisfy: -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 surface of the second lens barrel, and the inner diameter dbm of the second side surface of the second lens barrel satisfy: 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 surface of the first lens barrel, the inner diameter dam of the second side surface of the first lens barrel, and the entrance pupil diameter EPD of the VR visual system satisfy the following relationship: 0.23≤EPD / |das-dam|≤0.

81.

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

27.

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

3.

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

11. The VR visual system according to claim 1, characterized in that: The maximum thickness Lb from the first side surface of the second lens barrel to the second side surface 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: 2.16≤Lb / (f2 / V2)≤6.

80.

12. The VR visual system according to claim 1, characterized in that: An outer diameter Dbs of the first side surface of the second lens barrel, an inner diameter dbm of the second side surface of the second lens barrel, and a 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 Δf of the effective focal length 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: 0.1mm<Δf×(dbs / dbm)<0.4mm.

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

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