VR visual system

Abstract

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

Description

Technical Field

[0001] 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 technology, 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, the structural stability of the VR visual system is not high when adjusting the diopter, which causes assembly errors and causes some users to be unable to obtain a clear visual experience. Therefore, how to adjust the size and optical parameters of the lens barrel and optical elements of the VR visual system to meet a large diopter adjustment range while maintaining assembly stability 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 that it is difficult to balance a large diopter adjustment range and structural stability in the VR visual system in the prior art.

[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 being able to move along the direction of the optical axis, the first element group including at least a reflective polarizing element, a first quarter wave plate, and a first lens along the optical axis from the first side to the second side, the first lens having positive optical power, a first side surface of the first lens being 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 having positive optical power, the second lens The first side surface of the lens is convex, and the second side surface of the second lens is a plane; a lens barrel group, 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 fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens, and the inner diameter dam of the second side surface of the first lens barrel satisfy: 1.60≤fz1 / dam≤2.66; the outer diameter Dbs of the first side surface of the second lens barrel, the inner diameter dbs of the first side surface of the second lens barrel, and the distance ΔL moved by the second element group along the optical axis when the refractive power of the VR visual system ranges from +2D to -5D satisfy: 2.63≤(Dbs-dbs) / ΔL≤7.45.

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

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

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

[0008] 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 change Δf of the effective focal length when the refractive power of the VR visual system changes from +2D to -5D satisfy the following: 20.74≤Lb / Δf≤44.95.

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

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

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

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

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

[0014] Furthermore, a 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 an entrance pupil diameter EPD of the VR visual system satisfy the following relationship: 1.32≤La / EPD≤1.70.

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

[0016] Further, the combined focal length fz2 of the second lens, the second quarter wave plate and the polarizer, and 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 satisfy: 8.30≤fz2 / Lb≤18.91.

[0017] Furthermore, 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 ranges from +2D to -5D satisfy the following: 1.05mm<(Dbs / Dbm)×ΔL<1.75mm.

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

[0019] By applying the technical solution of the present invention, a VR visual system includes an element group and a lens barrel group, wherein 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, wherein the second element group can move along the direction of the optical axis, wherein the first element group includes at least a reflective polarizing element, a first quarter-wave plate, and a first lens along the optical axis from the first side to the second side, wherein the first lens has positive focal length, a first side surface of the first lens is a plane, and a second side surface of the first lens is a convex surface, and wherein 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, wherein the second lens has positive focal length, and the first side surface of the second lens is a convex surface. 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 fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens, and the inner diameter dam of the second side surface of the first lens barrel satisfy: 1.60≤fz1 / dam≤2.66; the outer diameter Dbs of the first side surface of the second lens barrel, the inner diameter dbs of the first side surface of the second lens barrel, and the distance ΔL moved by the second element group along the optical axis when the diopter of the VR visual system ranges from +2D to -5D satisfy: 2.63≤(Dbs-dbs) / ΔL≤7.45.

[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, and a first lens, 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 as a whole can move along the direction of the optical axis. By reasonably setting the combined focal length of the reflective polarizing element, the first quarter wave plate and the first lens of the VR visual system, the inner and outer diameters of the first lens barrel and the second lens barrel, and the moving distance of the second element group, while realizing the adjustment of the diopter of the VR visual system from the +2D state to the -5D state, the stable installation of the first element group in the first lens barrel and the stable movement and adjustment of the second element group can be ensured, which not only ensures sufficient moving space, but also avoids the assembly error caused by the movement of the second element group, thereby enhancing the overall stability and durability 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 1 A 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] Figure 5 to Figure 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 26 MTF curves of the VR visual system of Example 7 of the present invention in the first state and the second state are respectively shown.

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

[0037] 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

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] In order to solve the problem in the prior art that it is difficult to balance a large diopter adjustment range and structural stability in VR visual systems, the present invention provides a VR visual system.

[0045] First embodiment

[0046] like Figures 1 to 26As 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, the first element group includes at least a reflective polarizing element, a first quarter wave plate, and a first lens along the optical axis from the first side to the second side, the first lens 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 The second side surface of the 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 fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens, and the inner diameter dam of the second side surface of the first lens barrel satisfy: 1.60≤fz1 / dam≤2.66; the outer diameter Dbs of the first side surface of the second lens barrel, the inner diameter dbs of the first side surface of the second lens barrel, and the distance ΔL that the second element group moves along the optical axis when the refractive power of the VR visual system ranges from +2D to -5D satisfy: 2.63≤(Dbs-dbs) / ΔL≤7.45.

[0047] 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, and a first lens, 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 as a whole can move along the direction of the optical axis. By reasonably setting the combined focal length of the reflective polarizing element, the first quarter wave plate and the first lens of the VR visual system, the inner and outer diameters of the first lens barrel and the second lens barrel, and the moving distance of the second element group, while realizing the adjustment of the diopter of the VR visual system from the +2D state to the -5D state, the stable installation of the first element group in the first lens barrel and the stable movement and adjustment of the second element group can be ensured, which not only ensures sufficient moving space, but also avoids the assembly error caused by the movement of the second element group, thereby enhancing the overall stability and durability of the VR visual system.

[0048] VR visual systems are susceptible to factors such as manufacturing errors and assembly errors of components and changes in the use environment. The simulated yield can intuitively reflect the impact of these factors on the performance of the VR visual system, so as to predict the actual performance of the VR visual system. Table 1 below gives the simulated yield of the VR visual system in Scheme 1, Scheme 2 and Scheme 3 under different conditional values ​​for each field of view (Field). Among them, Table 1 describes the difference in yield data of the VR visual system imaging in the sagittal plane (SAG) and the meridian plane (TAN), and 0F to 1.0F is the normalized expression of the field of view, for example, 0F represents the central field of view of the VR visual system, 0.5F represents half of the maximum field of view of the VR visual system, and 1.0F represents the maximum field of view of the VR visual system.

[0049] Table 1

[0050]

[0051] For the VR visual systems shown in Schemes 2 and 3, fz1 / dam=3.2 and (Dbs-dbs) / ΔL=8.5 of Scheme 2 both exceed the upper limit of the conditional expression, and fz1 / dam=1.1 and (Dbs-dbs) / ΔL=2.0 of Scheme 3 both fall below the lower limit of the conditional expression. The performance of the VR visual systems corresponding to Schemes 2 and 3 in each field of view is poor, and the simulation yield is very low.

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

[0053] In this embodiment, the center thickness CTR of the reflective polarizing element on the optical axis, the center thickness CTQ1 of the first quarter wave plate on the optical axis, the center thickness CT1 of the first lens on the optical axis, and the maximum thickness La from the first side surface of the first lens barrel to the second side surface of the first lens barrel along the optical axis satisfy: 1.00≤(CTR+CTQ1+CT1) / La≤1.29. By limiting (CTR+CTQ1+CT1) / La within a reasonable range, the relationship between the element thickness of the first element group and the accommodation size of the lens barrel can be optimized, the structure of the VR visual system can be further optimized, aberrations can be reduced, and resolution and contrast can be improved. At the same time, a compact design and lightweight can be achieved, which is conducive to saving space and improving the portability of the VR visual system.

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

[0055] 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 and the change Δf of the effective focal length when the diopter of the VR visual system changes from +2D to -5D satisfy: 20.74≤Lb / Δf≤44.95. By limiting Lb / Δf within a reasonable range, the relationship between the accommodation size of the second lens barrel and the change Δf of the effective focal length when the diopter changes from +2D to -5D can be optimized, ensuring the stability of the imaging quality when adjusting the focal length of the VR visual system, which is very important for application scenarios requiring high definition.

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

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

[0058] In this embodiment, the combined focal length fz2 of the second lens, the second quarter wave plate and the polarizer, and the outer diameter Dbm of the second side surface of the second lens barrel satisfy: 1.55≤fz2 / Dbm≤3.13. By limiting fz2 / Dbm within a reasonable range, it is helpful to reduce the volume and weight of the VR visual system, improve portability and practicality, and ensure that the combined focal length of the second element group can be adjusted within a certain range to meet different observation requirements.

[0059] In this embodiment, the change Δf of the effective focal length when the diopter of the VR visual system changes from +2D to -5D, the outer diameter Das of the first side of the first lens barrel, and the inner diameter das of the first side of the first lens barrel satisfy the following conditions: 0.15mm<Δf×(Das / das)<0.45mm. By limiting Δf×(Das / das) within a reasonable range, precise focal length adjustment can be achieved, which is suitable for application scenarios of quickly and accurately adjusting the focal length observation distance or object size. At the same time, constraining Δf×(Das / das) improves the compatibility of the VR visual system and improves the clarity of the imaging surface at different distances.

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

[0061] 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 and the entrance pupil diameter EPD of the VR visual system satisfy the following: 1.32≤La / EPD≤1.70. By limiting La / EPD within a reasonable range, the relationship between the accommodation size of the first lens barrel and the entrance pupil diameter of the VR visual system can be optimized, the light transmission path can be further optimized, light loss can be reduced, and the light transmission performance and clarity of the VR visual system can be improved.

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

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

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

[0065] In this embodiment, the inner diameter dbm of the second side surface of the second lens barrel, the effective focal length f2 of the second lens, and the refractive index N2 of the second lens satisfy the following relationship: 0.25<dbm / (f2 / N2)<0.95. By limiting dbm / (f2 / N2) within a reasonable range, the relationship between the inner diameter of the second side surface of the second lens barrel and the second lens can be constrained, which helps to ensure the accurate installation position of the second lens, and at the same time ensures that the second lens and the second lens barrel are closely and stably matched, thereby reducing the degradation of imaging quality caused by the displacement of the second lens position.

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

[0067] Second embodiment

[0068] like Figures 1 to 26As 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, the first element group includes at least a reflective polarizing element, a first quarter wave plate, and a first lens along the optical axis from the first side to the second side, the first lens 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 convex surface. The two side surfaces are planes; 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 inner diameter dbs of the first side surface of the second lens barrel, the effective focal length f2 of the second lens, and the curvature radius R3 of the first side surface of the second lens satisfy: 14.00mm≤dbs / (f2 / R3)≤20.65mm; the outer diameter Dbs of the first side surface of the second lens barrel, the inner diameter dbs of the first side surface of the second lens barrel, and the distance ΔL that the second element group moves along the optical axis when the refractive power of the VR visual system ranges from +2D to -5D satisfy: 2.63≤(Dbs-dbs) / ΔL≤7.45.

[0069] 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 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 barrel and the second barrel, wherein the second barrel and the second element group can be moved along the direction of the optical axis as a whole. By reasonably setting the inner and outer diameters of the first side of the second barrel, the effective focal length of the second lens, the radius of curvature of the first side of the second lens, and the moving distance of the second element group, it is helpful to maintain the stable installation of the second element group in the second barrel, while ensuring that the light is correctly focused to provide a clear virtual image. At the same time, it is also ensured that the second element group realizes stable adjustment of the diopter from the +2D state to the -5D state in the second barrel, provides sufficient moving space to adapt to the diopter change, avoids the assembly error caused by the movement of the second element group, maintains the quality of the virtual image, and ensures the stable installation of the second element group in the second barrel, reduces the imaging offset caused by changes in the external environment, and improves the stability and durability of the VR visual system.

[0070] This embodiment may also include other parameter formulas in the first embodiment, which will not be described in detail here.

[0071] 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.

[0072] 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.

[0073] 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 marked 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 accompanying drawings when explaining specific examples later.

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

[0075] It should be noted that the movement of the second element group 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.

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

[0077] 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.

[0078] Embodiment 1

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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 is transmitted through the reflective polarizing element RP before being emitted.

[0083] Table 2 shows the basic structural parameter table of the VR visual system of Example 1, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all in millimeters (mm). In Table 2, 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.

[0084] Table 2

[0085]

[0086]

[0087] 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:

[0088]

[0089] 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 Table 1 above; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 3 below 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.

[0090] Table 3

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

[0092] In this embodiment, 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 In the second state shown, some structural parameters of the VR visual system change, wherein the distance between the first side and the aperture on the optical axis is D1, and the distance between the first element group and the second element group on the optical axis is D2, and the units of D1 and D2 are both millimeters (mm). As shown in Table 4, D1 and D2 are different between the first state and the second state of the VR visual system.

[0093] Table 4

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

[0095] Fig. 9 and Fig.10The 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.

[0096] Embodiment 2

[0097] like Figure 5 to Figure 6 As shown, the VR visual system of embodiment 2 of the present application is described. Figure 5 and Figure 6 The 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.

[0098] Embodiment 3

[0099] 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.

[0100] Embodiment 4

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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 is transmitted through the reflective polarizing element RP before being emitted.

[0105] Table 5 shows the basic structural parameter table of the VR visual system of Example 4, wherein the units of the curvature radius, thickness / distance, and effective focal length are all in millimeters (mm). In Table 5, 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.

[0106] Table 5

[0107] 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 12.0000 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 6.6172 1.639 23.52 refraction 5 Partially reflective element (BS) Aspheric -55.2294 -6.6172 1.639 23.52 reflection 2.8059 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 6.6172 1.639 23.52 refraction 9 Aspheric -55.2294 D2 refraction 2.8059 10 Second lens (E2) Aspheric 39.2193 8.0000 1.544 55.92 refraction 7.2329 11 Second Quarter Wave Plate (QWP2) Spherical endless 0.1000 1.517 64.17 refraction 12 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

[0108] Table 6 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.

[0109] Table 6

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

[0111] In this embodiment, the second element group is moved to change the diopter of the VR visual system, which can be achieved by Fig.11 The first state shown transitions to Fig.12In the second state shown, some structural parameters of the VR visual system change, wherein the distance between the first side and the aperture on the optical axis is D1, and the distance between the first element group and the second element group on the optical axis is D2, and the units of D1 and D2 are both millimeters (mm). As shown in Table 7, D1 and D2 are different between the first state and the second state of the VR visual system.

[0112] Table 7

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

[0114] 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.

[0115] Embodiment 5

[0116] 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.

[0117] Embodiment 6

[0118] 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.

[0119] Embodiment 7

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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 is transmitted through the reflective polarizing element RP before being emitted.

[0124] 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 8, the light from the image surface IMG propagates from surface number 14 to the side of surface number 1, and the refraction / reflection is the refraction or reflection effect of the surface on the light during this passage.

[0125] Table 8

[0126] 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 11.0000 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 7.1903 1.810 41.00 refraction 5 Partially reflective element (BS) Aspheric -59.9020 -7.1903 1.810 41.00 reflection 2.7905 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 7.1903 1.810 41.00 refraction 9 Aspheric -59.9020 D2 refraction 2.7905 10 Second lens (E2) Aspheric 62.3908 8.0000 1.544 55.92 refraction 16.6530 11 Second Quarter Wave Plate (QWP2) Spherical endless 0.1000 1.517 64.17 refraction 12 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

[0127] Table 9 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.

[0128] Table 9

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

[0130] In this embodiment, 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 In the second state shown, some structural parameters of the VR visual system change, wherein the distance between the first side and the aperture on the optical axis is D1, and the distance between the first element group and the second element group on the optical axis is D2, and the units of D1 and D2 are both millimeters (mm). As shown in Table 10, D1 and D2 are different between the first state and the second state of the VR visual system.

[0131] Table 10

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

[0133] 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.

[0134] Embodiment 8

[0135] 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.

[0136] Embodiment 9

[0137] 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.24The 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.

[0138] In summary, the first to ninth embodiments of the VR visual system respectively satisfy the relationship shown in Table 11. Among them, the conditional expressions of the first state and the second state corresponding to each embodiment of the VR visual system have the same values.

[0139] Table 11

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

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

[0142] Table 12

[0143]

[0144]

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

[0146] Table 13

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

[0148] Obviously, the 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.

[0149] 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.

[0150] 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.

[0151] 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, the first element group includes at least a reflective polarizing element, a first quarter wave plate, and a first lens along the optical axis from the first side to the second side, the first lens 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 fz1 of the reflective polarizing element, the first quarter wave plate and the first lens, and the inner diameter dam of the second side surface of the first lens barrel satisfy the following: 1.60≤fz1 / dam≤2.66; The outer diameter Dbs of the first side surface of the second lens barrel, the inner diameter dbs of the first side surface of the second lens barrel, and the distance ΔL that the second element group moves along the optical axis when the refractive power of the VR visual system ranges from +2D to -5D satisfy the following: 2.63≤(Dbs-dbs) / ΔL≤7.

45.

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

29.

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

22.

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

95.

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

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

15.

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

13.

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

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

99.

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

70.

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

40.

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

91.

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

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

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