Virtual reality system

Abstract

The present application discloses a virtual reality system, including a first optical system and a second optical system; the first optical system includes, from the first side to the second side along the first optical axis, a first lens, a reflective polarizing element, a second lens, a quarter-wave plate, a third lens, and a light source display; the second optical system includes, from the first side to the second side along the second optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; a distance BFL from the second side surface of the eighth lens of the second optical system to an imaging surface on the second optical axis, a distance BL from the second side surface of the third lens of the first optical system to the light source display on the first optical axis, an effective focal length fm of the first optical system, an effective focal length f of the second optical system, and a field of view angle FOV of the second optical system satisfy the following requirements: 1.0 <BFL / BL<5.0,‑5.0<fm / [f*tan(FOV / 2)]<0。

Description

Technical Field

[0001] The present application relates to the field of optical components, and more specifically, to a virtual reality system. Background Art

[0002] With the development of virtual reality (VR) technology, demand for interactive features such as real-world scene capture and body tracking, coupled with visual immersion, continues to grow. Optical tracking and positioning technology has emerged in recent years. This technology relies on the VR system's built-in camera to capture the external scene and infer the user's posture for positioning. This positioning technology can greatly improve the convenience of VR systems.

[0003] However, the tracking range of this positioning technology is limited by the capture range of the positioning lens and the size of the virtual reality system. Therefore, the field of view of the positioning lens of the current virtual reality system is generally small, the capture range is limited, and this leads to poor behavior matching accuracy. Summary of the Invention

[0004] The present application provides a virtual reality system, comprising: a first optical system, comprising, in order from the first side to the second side along a first optical axis: a first lens; a reflective polarizing element bonded to the second side of the first lens; a second lens; a quarter-wave plate bonded to the second side of the second lens; a third lens having a positive focal length; and a light source display; a second optical system, comprising, in order from the first side to the second side along the second optical axis: a first lens having a negative focal length; a second lens having a negative focal length; a third lens having a positive focal length; a fourth lens; a fifth lens having a positive focal length; a sixth lens; a seventh lens; and an eighth lens having a positive focal length; wherein a distance BFL from the second side of the eighth lens of the second optical system to an imaging plane on the second optical axis, a distance BL from the second side of the third lens of the first optical system to the light source display on the first optical axis, an effective focal length fm of the first optical system, an effective focal length f of the second optical system, and a field of view angle FOV of the second optical system satisfy the following conditions: 1.0 <BFL / BL<5.0,-5.0<fm / [f*tan(FOV / 2)]<0。

[0005] In one embodiment, the total thickness ΣCTm of the first lens to the third lens of the first optical system on the first optical axis and the total thickness ΣCT of the first lens to the eighth lens of the second optical system on the second optical axis satisfy the following: 0.5<ΣCTm / ΣCT<2.1.

[0006] In one embodiment, the effective focal length fm of the first optical system, the distance TDm from the first side surface of the first lens of the first optical system to the second side surface of the third lens on the first optical axis, the effective focal length f of the second optical system, and the distance TD from the first side surface of the first lens of the second optical system to the second side surface of the eighth lens on the second optical axis satisfy: -0.99<(fm-TDm) / (f-TD)<0.99.

[0007] In one embodiment, the curvature radius R16 of the second side surface of the eighth lens of the second optical system, the field of view FOV of the second optical system, the curvature radius R6m of the second side surface of the third lens of the first optical system and the field of view FOVm of the first optical system satisfy: -2.0<[R16*tan(FOV / 2)] / [R6m*tan(FOVm / 2)]<0.

[0008] In one embodiment, the effective focal length f3m of the third lens of the first optical system and the effective focal length fm of the first optical system satisfy: <f3m / fm<17.0。

[0009] In one embodiment, the air gap T23m between the quarter wave plate and the third lens of the first optical system on the first optical axis, the Abbe coefficient V3m of the third lens of the first optical system, the combined focal length f2m of the second lens and the quarter wave plate of the first optical system, and the effective focal length f3m of the third lens of the first optical system satisfy: -1.0 <T23m*V3m / (f2m-f3m)<0。

[0010] In one embodiment, a center thickness CT2m of the second lens of the first optical system on the first optical axis, a center thickness CT3m of the third lens of the first optical system on the first optical axis, a refractive index N2m of the second lens of the first optical system, a refractive index Ns of the quarter-wave plate of the first optical system, a curvature radius R4m of the second side surface of the second lens of the first optical system, and a curvature radius R6m of the second side surface of the third lens of the first optical system satisfy the following conditions: 0.01<(CT2m+CT3m)*(N2m+Ns) / |R4m+R6m|<0.50.

[0011] In one embodiment, the center thickness CT1m of the first lens of the first optical system on the first optical axis, the center thickness CT2m of the second lens of the first optical system on the first optical axis, the dispersion coefficient V1m of the first lens of the first optical system, and the curvature radius R3m of the first side surface of the second lens of the first optical system satisfy: 1.0<(CT1m+CT2m)*V1m / |R3m|<15.0.

[0012] In one embodiment, the maximum effective radius DT11m of the first side surface of the first lens of the first optical system, the maximum effective radius DT22m of the second side surface of the second lens of the first optical system, the refractive index N1m of the first lens of the first optical system, the refractive index N2m of the second lens of the first optical system, and the center thickness CTf of the reflective polarizing element of the first optical system on the first optical axis satisfy: 50.0<(DT11m+DT22m) / [(N1m+N2m)*CTf]<55.0.

[0013] In one embodiment, the effective focal length f of the second optical system, the effective focal length f3 of the third lens of the second optical system, and the effective focal length f4 of the fourth lens of the second optical system satisfy: <f3 / f<10.0,0<|f3+f4| / (f3-f4)<8.0。

[0014] In one embodiment, the effective focal length f8 of the eighth lens of the second optical system, the curvature radius R15 of the first side of the eighth lens of the second optical system, the curvature radius R16 of the second side of the eighth lens of the second optical system and the effective focal length f of the second optical system satisfy: 0.5 <f8 / (R15+R16)<3.0,0<f8 / f<5.0。

[0015] In one embodiment, the effective focal length f6 of the sixth lens of the second optical system, the effective focal length f7 of the seventh lens of the second optical system, the air gap T67 between the sixth lens and the seventh lens of the second optical system on the second optical axis, the dispersion coefficient V6 of the sixth lens of the second optical system and the dispersion coefficient V7 of the seventh lens of the second optical system satisfy: |f6-f7| / [T67*(V6+V7)]<7.0.

[0016] In one embodiment, the refractive index N6 of the sixth lens of the second optical system, the refractive index N7 of the seventh lens of the second optical system, the effective focal length f6 of the sixth lens of the second optical system, and the effective focal length f7 of the seventh lens of the second optical system satisfy: 0.8 <N6 / N7<1.3,-2.0<f6 / f7<0。

[0017] In one embodiment, the combined focal length f1234 of the first lens to the fourth lens of the second optical system, the effective focal length f3 of the third lens of the second optical system, and the effective focal length f4 of the fourth lens of the second optical system satisfy: <f1234 / (f3+f4)<1.0。

[0018] In one embodiment, the fifth lens of the second optical system is a glass lens, and the refractive index N4 of the fourth lens of the second optical system, the refractive index N5 of the fifth lens of the second optical system, the refractive index N6 of the sixth lens of the second optical system, and the dispersion coefficient V5 of the fifth lens of the second optical system satisfy: N5 / (N4+N6)≥0.504, V5>50.0.

[0019] In one embodiment, the effective focal length f of the second optical system and the combined focal length f5678 of the fifth lens to the eighth lens of the second optical system satisfy: <f / f5678<0.5。

[0020] In one embodiment, the curvature radius R9 of the first side surface of the fifth lens of the second optical system, the curvature radius R10 of the second side surface of the fifth lens of the second optical system, the curvature radius R7 of the first side surface of the fourth lens of the second optical system, and the curvature radius R8 of the second side surface of the fourth lens of the second optical system satisfy: 0.01<(R9+R10) / (R7+R8)<0.50.

[0021] The virtual reality system of the present application can minimize the total length of the first optical system by adopting a design in which three lenses are combined with a reflective polarizing element and a quarter-wave plate in the first optical system, and the third lens adopts a positive focal length design, which is conducive to compressing the height of the light, facilitates the selection of small-size light source displays, and contributes to the miniaturization of the entire first optical system; the first lens and the second lens in the second optical system adopt a negative focal length design, which can expand the range of the captured light; the third lens and the fifth lens in the second optical system adopt a positive focal length design, which facilitates the convergence and propagation of the captured light, and can avoid the middle part of the second optical system from being too large; the eighth lens in the second optical system also adopts a positive focal length design. , which can further compress the height of the light, is helpful for the selection of small-size chips, can reduce the overall space occupied by the virtual reality system, and avoid interference between the second optical system and the first optical system; by controlling the ratio of the back focal length of the second optical system to the first optical system, it is helpful to indirectly control the total length of the first optical system and the second optical system, avoid mutual interference between the two optical systems, and is beneficial to control the overall volume of the virtual reality system; by controlling the ratio of the effective focal length of the first optical system to the product of the effective focal length of the second optical system and its half field of view angle, it is helpful to reasonably distribute the focal length and field of view of the two optical systems, which is conducive to determining the basic lens arrangement method. At the same time, the field of view angle of the second optical system can be made larger, which is convenient for real-scene capture and enhanced positioning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0023] Figure 1 A schematic structural diagram of a virtual reality system according to an exemplary embodiment of the present application is shown;

[0024] Figure 2 shows a schematic structural diagram of embodiment 1 of the first optical system according to the present application;

[0025] Figures 3A to 3C axial chromatic aberration curve, astigmatism curve, and distortion curve of Example 1 of the first optical system are respectively shown;

[0026] Figure 4 shows a schematic structural diagram of Example 2 of the first optical system according to the present application;

[0027] Figures 5A to 5C axial chromatic aberration curve, astigmatism curve, and distortion curve of Example 2 of the first optical system are respectively shown;

[0028] Figure 6 shows a structural schematic diagram of Example 3 of the first optical system according to the present application;

[0029] 7A to 7C axial chromatic aberration curve, astigmatism curve, and distortion curve of Example 3 of the first optical system are respectively shown;

[0030] Figure 8 shows a structural schematic diagram of Example 1 of the second optical system according to the present application;

[0031] Figures 9A to 9C axial chromatic aberration curve, astigmatism curve, and distortion curve of Example 1 of the second optical system are respectively shown;

[0032] Figure 10 shows a structural schematic diagram of Example 2 of the second optical system according to the present application;

[0033] Figures 11A to 11C axial chromatic aberration curve, astigmatism curve, and distortion curve of Example 2 of the second optical system are respectively shown;

[0034] Figure 12 shows a schematic structural diagram of Example 3 of the second optical system according to the present application;

[0035] 13A to 13C axial chromatic aberration curve, astigmatism curve, and distortion curve of Example 3 of the second optical system are respectively shown;

[0036] Figure 14shows a structural schematic diagram of Example 4 of the second optical system according to the present application; and

[0037] Figures 15A to 15C The axial chromatic aberration curve, astigmatism curve, and distortion curve of Example 4 of the second optical system are respectively shown. DETAILED DESCRIPTION

[0038] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] It should be noted that in this specification, the terms "first," "second," etc., are used solely to distinguish one feature from another and do not represent any limitation of the features. Therefore, without departing from the teachings of this application, the first optical system discussed below may also be referred to as the second optical system, and the second optical system may also be referred to as the first optical system.

[0040] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0041] In this article, the paraxial region refers to the region near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region; if a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region.

[0042] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0043] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0044] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] The features, principles and other aspects of the present application are described in detail below.

[0046] Figure 1 FIG. 1 shows a schematic diagram of the structure of a virtual reality system according to an exemplary embodiment of the present application. Figure 1 As shown, a virtual reality system 1000 according to an exemplary embodiment of the present application may include a first optical system 100 and a second optical system 200. The first optical system 100 may include a first lens, a reflective polarizing element, a second lens, a quarter-wave plate, a third lens, and a light source display, arranged in sequence from the first side to the second side along the first optical axis. The reflective polarizing element may be bonded to the second side of the first lens, the quarter-wave plate may be bonded to the second side of the second lens, and the focal length of the third lens may be positive. The second optical system 200 may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, arranged in sequence from the first side to the second side along the second optical axis. The focal lengths of the first lens and the second lens may be negative, and the focal lengths of the third lens, the fifth lens, and the eighth lens may be positive.

[0047] In an exemplary embodiment, the first optical system 100 may be an eyepiece, with the first side being the eye side and the second side being the display side. Accordingly, the first side may be referred to as the eye side and the second side as the display side. Image light from the light source display is refracted and reflected multiple times by the third lens, the quarter-wave plate, the second lens, the reflective polarizer, and the first lens before ultimately being projected onto the user's eye. The second optical system 200 may be a positioning lens, with the first side being the object side and the second side being the image side. Accordingly, the first side may be referred to as the object side and the second side as the image side.

[0048] The positioning lens in the present application collects images in the surrounding environment or the user's posture, and the collected images in the surrounding environment or the user's posture can be transmitted to the processing system through the chip of the positioning lens. The processing system analyzes the images in the surrounding environment or the user's posture, and determines the information required to be displayed by the eyepiece based on the analysis results, and then transmits the information required to be displayed by the eyepiece to the eyepiece. The eyepiece dynamically adjusts the virtual image of the light source display according to the received information required to be displayed, and finally projects the virtual image to the user's eyes to make the user feel immersive. The virtual reality system 1000 provided in the present application combines the virtual immersion of the eyepiece with the positioning function of the positioning lens, breaks through the spatial limitations of the virtual reality system 1000, and realizes the interaction between the real world and the virtual world of the virtual reality system 1000.

[0049] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional expressions 1.0 < BFL / BL < 5.0 and -5.0 < fm / [f * tan(FOV / 2)] < 0, where BFL is the distance from the second side of the eighth lens of the second optical system 200 to the imaging surface on the second optical axis, BL is the distance from the second side of the third lens of the first optical system 100 to the light source display on the first optical axis, fm is the effective focal length of the first optical system 100, f is the effective focal length of the second optical system 200, and FOV is the field angle of the second optical system 200. By adopting a design in which the first optical system 100 uses three lenses in cooperation with a reflective polarizing element and a quarter-wave plate, the total length of the first optical system 100 can be compressed to the minimum as much as possible. Moreover, by adopting a design with a positive focal length for the third lens, it is beneficial to compress the height of the light, facilitating the selection of a small-sized light source display and contributing to the miniaturization of the overall first optical system 100. By adopting a design with negative focal lengths for the first lens and the second lens in the second optical system 200, the range of light that can be captured can be expanded. By adopting a design with positive focal lengths for the third lens and the fifth lens in the second optical system 200, it is convenient for the captured light to be converged and propagated, avoiding excessive size in the middle part of the second optical system 200. By also adopting a design with a positive focal length for the eighth lens in the second optical system 200, the height of the light can be further compressed, facilitating the selection of a small-sized chip, reducing the overall space occupied by the virtual reality system 1000, and avoiding interference between the second optical system 200 and the first optical system 100. By controlling the ratio of the back focal lengths of the second optical system 200 and the first optical system 100, it is helpful to indirectly control the total lengths of the first optical system 100 and the second optical system 200, avoid mutual interference between the two optical systems, and is beneficial to the control of the overall volume of the virtual reality system 1000. By controlling the ratio of the effective focal length of the first optical system 100, the effective focal length of the second optical system 200, and the product of the semi-field angle, it is helpful to reasonably distribute the focal lengths and fields of the two optical systems, beneficial to determining the basic lens arrangement, and at the same time, the field angle of the second optical system 200 can be made larger, facilitating the capture of real scenes and enhancing the positioning effect.

[0050] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional expression 0.5 < ∑CTm / ∑CT < 2.1, where ∑CTm is the total thickness of the first lens to the third lens of the first optical system 100 on the first optical axis respectively, and ∑CT is the total thickness of the first lens to the eighth lens of the second optical system 200 on the second optical axis respectively. By controlling the ratio of the total middle thicknesses of the lenses in the two optical systems, it is beneficial to ensure the basic strength of each lens and is beneficial to the molding and assembly of the lenses.

[0051] In an exemplary embodiment, the virtual reality system 1000 of the present application may satisfy the conditional formula -0.99 < (fm - TDm) / (f - TD) < 0.99, where fm is the effective focal length of the first optical system 100, TDm is the distance on the first optical axis from the first side surface of the first lens of the first optical system 100 to the second side surface of the third lens, f is the effective focal length of the second optical system 200, and TD is the distance on the second optical axis from the first side surface of the first lens of the second optical system 200 to the second side surface of the eighth lens. In one example, -0.5 < (fm - TDm) / (f - TD) < -0.01, 0.01 < (fm - TDm) / (f - TD) < 0.30. By controlling the ratio of the difference between the effective focal length of the two optical systems and the total length of their lens groups, it is beneficial to control the total lengths of the first optical system and the second optical system, facilitating further compression of their respective volumes on the basis of avoiding assembly interference between the two optical systems.

[0052] In an exemplary embodiment, the virtual reality system 1000 of the present application may satisfy the conditional formula -2.0 < [R16 * tan(FOV / 2)] / [R6m * tan(FOVm / 2)] < 0, where R16 is the radius of curvature of the second side surface of the eighth lens of the second optical system 200, FOV is the field angle of the second optical system 200, R6m is the radius of curvature of the second side surface of the third lens of the first optical system 100, and FOVm is the field angle of the first optical system 100. In one example, -0.99 < [R16 * tan(FOV / 2)] / [R6m * tan(FOVm / 2)] < -0.01. By controlling the product of the radius of curvature of the last lens surface in the two optical systems and the half-field angle of the corresponding optical system and controlling the ratio thereof within a reasonable range, the field sizes of the two optical systems can be effectively controlled, which is beneficial to controlling the distortion and the exit angle of the chief ray within a reasonable range and avoiding difficulties in aberration correction caused by too low relative contrast and severe lens bending.

[0053] In an exemplary embodiment, the virtual reality system 1000 of the present application may satisfy the conditional formula 0 < f3m / fm < 17.0, where f3m is the effective focal length of the third lens of the first optical system 100 and fm is the effective focal length of the first optical system 100. By controlling the ratio of the effective focal length of the third lens in the first optical system to the effective focal length of the first optical system, it is beneficial to control the light beam convergence of the light source display, facilitating indirectly controlling the radius of curvature of the second side surface of the third lens and guiding the size selection of the light source display.

[0054] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional formula -1.0 < T23m * V3m / (f2m - f3m) < 0, where T23m is the air gap between the quarter-wave plate of the first optical system 100 and the third lens on the first optical axis, V3m is the dispersion coefficient of the third lens of the first optical system 100, f2m is the combined focal length of the second lens and the quarter-wave plate of the first optical system 100, and f3m is the effective focal length of the third lens of the first optical system 100. By controlling the product of the air gap from the quarter-wave plate to the third lens in the first optical system and the dispersion coefficient of the third lens, and the difference between the combined focal length of the second lens and the quarter-wave plate and the effective focal length of the third lens, the ratio of the two is controlled within a reasonable range. On the one hand, it is beneficial to ensure the assembly gap between the second lens and the third lens and avoid interference. At the same time, it is beneficial to the material selection of the third lens, facilitating the control of the overall chromatic aberration of the first optical system. At the same time, the focal length of the first optical system can be reasonably distributed, which is beneficial to the control of the shape and curvature arrangement of the lens.

[0055] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional formula 0.01 < (CT2m + CT3m) * (N2m + Ns) / |R4m + R6m| < 0.50, where CT2m is the central thickness of the second lens of the first optical system 100 on the first optical axis, CT3m is the central thickness of the third lens of the first optical system 100 on the first optical axis, N2m is the refractive index of the second lens of the first optical system 100, Ns is the refractive index of the quarter-wave plate of the first optical system 100, R4m is the curvature radius of the second side of the second lens of the first optical system 100, and R6m is the curvature radius of the second side of the third lens of the first optical system 100. By controlling the product of the sum of the central thicknesses of the second lens and the third lens in the first optical system and the sum of the refractive indices of the second lens and the attached quarter-wave plate, and the absolute value of the sum of the curvature radii of the second side of the second lens and the second side of the third lens, the ratio of the two is controlled within a reasonable range, which is beneficial to reasonably standardize the material selection and shape of the second lens, the third lens and the quarter-wave plate on the basis of ensuring the forming and assembly strength of the second lens and the third lens, facilitating the control of the light rays in the marginal field of view, ensuring the brightness of imaging, and reducing marginal aberrations such as distortion.

[0056] In an exemplary embodiment, the virtual reality system 1000 of the present application may satisfy the conditional equation 1.0 < (CT1m + CT2m) * V1m / |R3m| < 15.0, where CT1m is the center thickness of the first lens of the first optical system 100 on the first optical axis, CT2m is the center thickness of the second lens of the first optical system 100 on the first optical axis, V1m is the chromatic aberration coefficient of the first lens of the first optical system 100, and R3m is the radius of curvature of the first side surface of the second lens of the first optical system 100. By controlling the product of the sum of the center thicknesses of the first and second lenses in the first optical system and the chromatic aberration coefficient of the first lens, as well as the radius of curvature of the first side surface of the second lens, the ratio between the two can be controlled within a reasonable range. This helps ensure the molding strength of the first and second lenses, facilitates the material selection of the first lens and the curvature design of the surface adjacent to the second lens, and facilitates the control of the image height of the projected light, thereby obtaining a larger visual image and enhancing visual immersion.

[0057] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional equation 50.0 < (DT11m + DT22m) / [(N1m + N2m) * CTf] < 55.0, where DT11m is the maximum effective radius of the first side surface of the first lens of the first optical system 100, DT22m is the maximum effective radius of the second side surface of the second lens of the first optical system 100, N1m is the refractive index of the first lens of the first optical system 100, N2m is the refractive index of the second lens of the first optical system 100, and CTf is the center thickness of the reflective polarizer of the first optical system 100 along the first optical axis. By controlling the sum of the maximum radii of the first side surface of the first lens and the second side surface of the second lens in the first optical system, as well as the product of the sum of the refractive indices of the first and second lenses and the center thickness of the reflective polarizer, the ratio of the two values ​​can be controlled within a reasonable range. This helps narrow the material selection range for the first and second lenses, standardizes diameter and center thickness dimensions, and facilitates molding and processing, as well as space reservation for the entire virtual reality system.

[0058] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional expressions 0 < f3 / f < 10.0 and 0 < |f3 + f4| / (f3 - f4) < 8.0, where f is the effective focal length of the second optical system 200, f3 is the effective focal length of the third lens of the second optical system 200, and f4 is the effective focal length of the fourth lens of the second optical system 200. By controlling the ratio of the effective focal length of the third lens in the second optical system to the focal length of the second optical system within a reasonable range, the center thickness and radius of curvature of the third lens can be indirectly controlled. By simultaneously controlling the ratio of the absolute value of the sum of the effective focal lengths of the third lens and the fourth lens to the difference within a reasonable range, it is beneficial to converge and concentrate the light rays entering from the outside, facilitate reducing the volume of the latter section of the second optical system, and reduce the space occupied by the overall virtual reality system.

[0059] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional expressions 0.5 < f8 / (R15 + R16) < 3.0 and 0 < f8 / f < 5.0, where f8 is the effective focal length of the eighth lens of the second optical system 200, R15 is the radius of curvature of the first side surface of the eighth lens of the second optical system 200, R16 is the radius of curvature of the second side surface of the eighth lens of the second optical system 200, and f is the effective focal length of the second optical system 200. By controlling the ratio of the effective focal length of the eighth lens in the second optical system to the sum of the radii of curvature of its two surfaces, and the proportion of the focal length of the eighth lens in the focal length of the entire second optical system, on the one hand, it is beneficial to determine the basic center thickness and shape of the eighth lens and ensure basic imaging processing, and on the other hand, it is convenient to control the outgoing light rays, improve the brightness and quality of imaging.

[0060] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional expression |f6 - f7| / [T67*(V6 + V7)] < 7.0, where f6 is the effective focal length of the sixth lens of the second optical system 200, f7 is the effective focal length of the seventh lens of the second optical system 200, T67 is the air gap between the sixth lens and the seventh lens of the second optical system on the second optical axis, V6 is the dispersion coefficient of the sixth lens of the second optical system 200, and V7 is the dispersion coefficient of the seventh lens of the second optical system 200. By controlling the difference between the effective focal lengths of the sixth lens and the seventh lens in the second optical system, and the product of the air gap between the two lenses and the sum of the dispersion coefficients, and controlling the two within a reasonable range, it helps to select materials with a small Abbe number for the lenses on the basis of ensuring the effective focal length and assembly gap, reduce the dispersion phenomenon, weaken the imaging distortion situation, and enhance the accuracy of positioning imaging.

[0061] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional expression 0.8 < N6 / N7 < 1.3, -2.0 < f6 / f7 < 0, where N6 is the refractive index of the sixth lens of the second optical system 200, N7 is the refractive index of the seventh lens of the second optical system 200, f6 is the effective focal length of the sixth lens of the second optical system 200, and f7 is the effective focal length of the seventh lens of the second optical system 200. By controlling the ratio of the refractive indices of the sixth lens and the seventh lens in the second optical system, as well as the ratio of the focal lengths of the two lenses, it is beneficial to narrow the material selection range of the two lenses, facilitate the selection of low birefringence materials, and at the same time is beneficial to indirectly control design parameters such as the radius of curvature and the center thickness dimension. On the basis of ensuring basic forming and assembly, the focal lengths of the two lenses are opposite and the ratio range is specified, which can optimize aberrations such as dispersion and distortion and improve the imaging quality of the second optical system.

[0062] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional expression 0 < f1234 / (f3 + f4) < 1.0, where f1234 is the combined focal length of the first lens to the fourth lens of the second optical system 200, f3 is the effective focal length of the third lens of the second optical system 200, and f4 is the effective focal length of the fourth lens of the second optical system 200. By controlling the ratio of the combined focal length of the first lens, the second lens, the third lens, and the fourth lens in the second optical system to the sum of the focal lengths of the third lens and the fourth lens, it is beneficial to reasonably distribute the focal length of the second optical system, expand the range of incident light, and increase the positioning and recognition ability.

[0063] In an exemplary embodiment, the fifth lens of the second optical system 200 is a glass lens, and the virtual reality system 1000 of the present application can satisfy the conditional expressions N5 / (N4 + N6) ≥ 0.504, V5 > 50.0, where N4 is the refractive index of the fourth lens of the second optical system 200, N5 is the refractive index of the fifth lens of the second optical system 200, N6 is the refractive index of the sixth lens of the second optical system 200, and V5 is the dispersion coefficient of the fifth lens of the second optical system 200. In one example, 0.53 > N5 / (N4 + N6) ≥ 0.504, 65.0 > V5 > 53.0. By controlling the ratio of the refractive index of the fifth lens in the second optical system to the sum of the refractive indices of the fourth lens and the sixth lens to be greater than or equal to a set value, and at the same time controlling the dispersion coefficient of the fifth lens to be greater than a set value, it is beneficial to narrow the lens selection range, facilitate the selection of low birefringence and dispersion coefficient materials, and at the same time, glass lenses can be used to reduce the influence of external environments such as aerosol and temperature, improve the reliability of the second optical system, and strengthen the positioning and picking ability.

[0064] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional expression 0 < f / f5678 < 0.5, where f is the effective focal length of the second optical system 200, and f5678 is the combined focal length of the fifth to eighth lenses of the second optical system 200. By controlling the ratio of the focal length of the second optical system to the combined focal length of the fifth, sixth, seventh, and eighth lenses, it is beneficial to control the total length and lens diameter of the second half of the second optical system, can reduce the space occupied by the overall virtual reality system, and improve the portability of the virtual reality system.

[0065] In an exemplary embodiment, the virtual reality system 1000 of the present application can satisfy the conditional expression 0.01 < (R9 + R10) / (R7 + R8) < 0.50, where R9 is the radius of curvature of the first side of the fifth lens of the second optical system 200, R10 is the radius of curvature of the second side of the fifth lens of the second optical system 200, R7 is the radius of curvature of the first side of the fourth lens of the second optical system 200, and R8 is the radius of curvature of the second side of the fourth lens of the second optical system 200. By controlling the ratio of the sum of the radii of curvature of the two surfaces of the fourth lens to the sum of the radii of curvature of the two surfaces of the fifth lens in the second optical system, and making the sum of the radii of curvature of the fifth lens slightly larger, it is beneficial to light transmission and further regulation of marginal aberration by the lenses behind the second optical system, can optimize the final imaging, and improve the positioning effect and accuracy.

[0066] In an exemplary embodiment, the second side of the first lens in the first optical system 100 can be a plane, and the reflective polarizing element can be adhered to the second side of the first lens by means of plane lamination, which can ensure the quality after the reflective polarizing element is adhered.

[0067] In an exemplary embodiment, the second side of the second lens in the first optical system 100 can be a plane, and the quarter-wave plate can be adhered to the second side of the second lens by means of plane lamination, which can ensure the quality after the quarter-wave plate is adhered.

[0068] In an exemplary embodiment, the first optical system 100 can further include a partial reflection layer, and the partial reflection layer can be, for example, plated on the first side or the second side of the third lens. The partial reflection layer has a semi-transmissive and semi-reflective effect on light. By providing a partial reflection layer on the third lens and combining the reflective polarizing element provided on the first lens and the quarter-wave plate provided on the second lens, it is possible to make the light fold back multiple times and effectively reduce the body length of the optical system.

[0069] By providing a partial reflection layer on the second side of the third lens and combining the reflective polarizing element on the second side of the first lens and the quarter-wave plate on the second side of the second lens, it is possible to make the light fold back multiple times and effectively reduce the body length of the optical system.

[0070] In an exemplary embodiment, the first optical system 100 may further include a first aperture, which may be disposed at an appropriate position of the first optical system 100 according to actual needs. For example, the first aperture may be located between the first side and the first lens. The aperture may constrain the light path and control the light intensity.

[0071] In an exemplary embodiment, the second optical system 200 may further include a second aperture, and the second aperture may be disposed at an appropriate position of the second optical system 200 according to actual needs. For example, the second aperture may be located between the third lens and the fourth lens.

[0072] In an exemplary embodiment, the second optical system 200 may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0073] In an embodiment of the present application, at least one of the mirror surfaces of each of the first through third lenses of the first optical system 100 is an aspherical surface. Aspherical lenses are characterized by a continuously varying curvature from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspherical lenses have a better curvature radius characteristic, with the advantages of reducing distortion and astigmatism. The use of aspherical lenses can minimize aberrations that occur during imaging, thereby improving image quality.

[0074] In an embodiment of the present application, at least one of the mirror surfaces of each lens in the first to eighth lenses of the second optical system 200 is an aspherical mirror surface.

[0075] Those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses and / or mirrors constituting the first optical system 100 and the second optical system 200 can be changed to obtain the various results and advantages described in this specification.

[0076] Those skilled in the art should understand that in the above embodiment, only two optical systems are described as an example. However, without departing from the technical solution claimed in this application, the number of optical systems constituting the virtual reality system 1000 of this application may not be limited to two.

[0077] Specific embodiments of the first optical system 100 applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0078] Example 1

[0079] The following reference Figures 2 to 3C Example 1 of the first optical system 100 according to the present application is described. Figure 2FIG. 1 shows a schematic structural diagram of the first optical system 110 according to Example 1 of the present application.

[0080] like Figure 2 As shown, the first optical system 110 includes, in order from the first side to the second side along the first optical axis: an aperture STO, a first lens E'1, a reflective polarizer RP, a second lens E'2, a quarter-wave plate QWP, a third lens E'3, and a light source display. The reflective polarizer RP is bonded to the second side surface S2 of the first lens E'1, the quarter-wave plate QWP is bonded to the second side surface S5 of the second lens E'2, the third lens E'3 has a positive focal length, and a partially reflective layer BS is provided on the first side surface S7 of the third lens E'3.

[0081] In this embodiment, image light from the image surface S9 of the light source display sequentially passes through the third lens E'3, the quarter-wave plate QWP, and the second lens E'2 before reaching the reflective polarizer RP. Reflected at the reflective polarizer RP, it forms the first reflected image light. The first reflected image light then passes through the second lens E'2 and the quarter-wave plate QWP before reaching the partially reflective layer BS, where it reflects to form the second reflected image light. The second reflected image light then sequentially passes through the quarter-wave plate QWP, the second lens E'2, the reflective polarizer RP, the first lens E'1, and the grating STO, ultimately projecting toward, for example, the user's eyes.

[0082] In this embodiment, the first side surface S1 of the first lens E'1 is a plane, and the second side surface S2 is a plane. The first side surface S4 of the second lens E'2 is a convex surface, and the second side surface S5 is a convex surface. The first side surface S7 of the third lens E'3 is a concave surface, and the second side surface S8 is a convex surface.

[0083] Table 1 shows basic parameters of the first optical system 110 of Example 1, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0084]

[0085]

[0086] In Example 1, the first side surface and the second side surface of the second lens E'2 and the third lens E'3 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0087]

[0088] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Tables 2-1 and 2-2 list the high-order coefficients A4, A6, A8, A9 of each aspheric mirror surface S4, S5, S7, and S8 in the first optical system 110 that can be used in Example 1. 10 、A 12 、A 14 、A 16 、A 20 、A 22 and A 24 .

[0089] Face number A4 A6 A8 A10 A12 S4 -4.06E+00 1.95E+00 -7.35E-01 1.41E-01 6.01E-02 S5 -3.58E-01 1.58E-01 -9.21E-03 -5.89E-03 -4.66E-03 S7 -4.23E-01 5.55E-03 1.70E-03 1.11E-03 -2.55E-05 S8 -1.82E-01 2.08E-03 -3.32E-03 7.89E-04 2.41E-04

[0090] Table 2-1

[0091] Face number A14 A16 A20 A22 A24 S4 -1.37E-03 -3.23E-02 -6.50E-05 1.07E-07 2.59E-08 S5 -1.58E-03 -1.75E-05 -9.71E-07 0.00E+00 0.00E+00 S7 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0092] Table 2-2

[0093] Figure 3A The axial chromatic aberration curve of the first optical system 110 of Example 1 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the first optical system 110. Figure 3B The astigmatism curve of the first optical system 110 of Example 1 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 3C The distortion curve of the first optical system 110 of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figures 3A to 3C It can be seen that the first optical system 110 of Example 1 can achieve good imaging quality.

[0094] Example 2

[0095] The following reference Figures 4 to 5C A second embodiment of the first optical system 100 according to the present application will be described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those of the first embodiment of the first optical system 100 will be omitted. Figure 4 FIG. 1 shows a schematic structural diagram of the first optical system 120 according to Example 2 of the present application.

[0096] like Figure 4As shown, the first optical system 120 includes, in order from the first side to the second side along the first optical axis: an aperture STO, a first lens E'1, a reflective polarizer RP, a second lens E'2, a quarter-wave plate QWP, a third lens E'3, and a light source display. The reflective polarizer RP is bonded to the second side surface S2 of the first lens E'1, the quarter-wave plate QWP is bonded to the second side surface S5 of the second lens E'2, the third lens E'3 has a positive focal length, and a partially reflective layer BS is provided on the second side surface S8 of the third lens E'3.

[0097] In this embodiment, image light from the image surface S9 of the light source display sequentially passes through the third lens E'3, the quarter-wave plate QWP, and the second lens E'2 before reaching the reflective polarizer RP. Reflected at the reflective polarizer RP, it forms the first reflected image light. The first reflected image light then passes through the second lens E'2, the quarter-wave plate QWP, and the third lens E'3 before reaching the partially reflective layer BS. Reflected at the partially reflective layer BS, it forms the second reflected image light. The second reflected image light then sequentially passes through the third lens E'3, the quarter-wave plate QWP, the second lens E'2, the reflective polarizer RP, the first lens E'1, and the grating STO, ultimately projecting toward, for example, the user's eyes.

[0098] In this embodiment, the first side surface S1 of the first lens E'1 is convex, and the second side surface S2 is flat. The first side surface S4 of the second lens E'2 is concave, and the second side surface S5 is concave. The first side surface S7 of the third lens E'3 is convex, and the second side surface S8 is convex.

[0099] Table 3 shows the basic parameters of the first optical system 120 of Example 2, where the units of curvature radius and thickness are both in millimeters (mm). In this embodiment, the first and second side surfaces of the second lens E'1 and the third lens E'3 are both aspherical. Table 4 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50 10 、A 12 、A 14 and A 16 , wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 of the above-mentioned first optical system 100.

[0100]

[0101] Table 3

[0102]

[0103]

[0104] Table 4

[0105] Figure 5A The axial chromatic aberration curve of the first optical system 120 of Example 2 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the first optical system 120. Figure 5B An astigmatism curve of the first optical system 120 of Example 2 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 5C The distortion curve of the first optical system 120 of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figures 5A to 5C It can be seen that the first optical system 120 of Example 2 can achieve good imaging quality.

[0106] Example 3

[0107] The following reference Figures 6 to 7C Example 3 of the first optical system 100 according to the present application is described. Figure 6 FIG. 1 shows a schematic structural diagram of the first optical system 130 according to Example 3 of the present application.

[0108] like Figure 6 As shown, the first optical system 130 includes, in order from the first side to the second side along the first optical axis: an aperture STO, a first lens E'1, a reflective polarizer RP, a second lens E'2, a quarter-wave plate QWP, a third lens E'3, and a light source display. The reflective polarizer RP is bonded to the second side surface S2 of the first lens E'1, the quarter-wave plate QWP is bonded to the second side surface S5 of the second lens E'2, the third lens E'3 has a positive focal length, and a partially reflective layer BS is provided on the second side surface S8 of the third lens E'3.

[0109] In this embodiment, image light from the image surface S9 of the light source display sequentially passes through the third lens E'3, the quarter-wave plate QWP, and the second lens E'2 before reaching the reflective polarizer RP. Reflected at the reflective polarizer RP, it forms the first reflected image light. The first reflected image light then passes through the second lens E'2, the quarter-wave plate QWP, and the third lens E'3 before reaching the partially reflective layer BS. Reflected at the partially reflective layer BS, it forms the second reflected image light. The second reflected image light then sequentially passes through the third lens E'3, the quarter-wave plate QWP, the second lens E'2, the reflective polarizer RP, the first lens E'1, and the grating STO, ultimately projecting toward, for example, the user's eyes.

[0110] In this embodiment, the first side surface S1 of the first lens E'1 is convex, and the second side surface S2 is convex. The first side surface S4 of the second lens E'2 is concave, and the second side surface S5 is convex. The first side surface S7 of the third lens E'3 is convex, and the second side surface S8 is convex.

[0111] Table 5 shows the basic parameters of the first optical system 130 of Example 3, where the units of curvature radius and thickness are millimeters (mm). In this embodiment, the second side surface of the first lens E'1, the first side surface of the second lens E'2, and the first and second side surfaces of the third lens E'3 are all aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 、A 12 and A 14 , wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 of the above-mentioned first optical system 100.

[0112]

[0113]

[0114] Table 5

[0115] Face number A4 A6 A8 A10 A12 A14 S2 -4.76E-01 -3.82E-02 -4.64E-03 5.85E-04 2.71E-04 0.00E+00 S4 -3.30E-01 -9.77E-02 8.60E-03 5.25E-03 1.39E-02 4.90E-03 S7 -2.35E+00 1.11E-01 -8.33E-03 4.54E-02 2.67E-03 0.00E+00 S8 -2.74E-01 3.49E-02 6.58E-03 1.54E-02 2.54E-03 0.00E+00

[0116] Table 6

[0117] Figure 7A The axial chromatic aberration curve of the first optical system 130 of Example 3 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the first optical system 130. Figure 7B An astigmatism curve of the first optical system 130 of Example 3 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 7C The distortion curve of the first optical system 130 of Example 3 is shown, which represents the distortion value corresponding to different field angles. 7A to 7C It can be seen that the first optical system 130 of Example 3 can achieve good imaging quality.

[0118] Specific embodiments of the second optical system 200 applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0119] Example 1

[0120] The following reference Figures 8 to 9C Example 1 of the second optical system 200 according to the present application is described. Figure 8 FIG. 2 shows a schematic structural diagram of the second optical system 210 according to Example 1 of the present application.

[0121] like Figure 8 As shown, the second optical system 210 includes, in order from the first side to the second side along the second optical axis: a first lens element E1, a second lens element E2, a third lens element E3, an aperture STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an imaging surface S19. The focal lengths of the first lens element E1 and the second lens element E2 are negative, while the focal lengths of the third lens element E3, the fifth lens element E5, and the eighth lens element E8 are positive.

[0122] In this embodiment, the first side surface S1 of the first lens E1 is convex, and the second side surface S2 is concave. The first side surface S3 of the second lens E2 is concave, and the second side surface S4 is concave. The first side surface S5 of the third lens E3 is convex, and the second side surface S6 is concave. The first side surface S7 of the fourth lens E4 is concave, and the second side surface S8 is convex. The first side surface S9 of the fifth lens E5 is convex, and the second side surface S10 is convex. The first side surface S11 of the sixth lens E6 is concave, and the second side surface S12 is convex. The first side surface S13 of the seventh lens E7 is convex, and the second side surface S14 is concave. The first side surface S15 of the eighth lens E8 is convex, and the second side surface S16 is concave.

[0123] Table 7 shows the basic parameters of the second optical system 210 of Example 1, wherein the units of the curvature radius and thickness are both in millimeters (mm). In this embodiment, the first and second side surfaces of the second lens E2 to the eighth lens E8 are all aspherical surfaces. Tables 8-1 and 8-2 show the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 . A 26 、A 30 and A 32 , wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 of the above-mentioned first optical system 100.

[0124]

[0125] Table 7

[0126] Face number A4 A6 A8 A10 A12 A14 A16 S3 3.3049E-02 -2.2526E-02 8.8905E-03 1.3042E-03 -3.6907E-03 2.3074E-03 -8.6179E-04 S4 -9.6223E-02 1.1089E+00 -5.6274E+00 1.7754E+01 -3.7809E+01 5.6474E+01 -6.0494E+01 S5 -1.2143E-02 5.1952E-01 -3.1133E+00 1.2062E+01 -3.1358E+01 5.6542E+01 -7.2338E+01 S6 2.5718E-02 2.8244E-01 -6.9666E-01 -2.6883E+00 2.7824E+01 -1.0687E+02 2.4801E+02 S7 1.4851E-02 -1.2288E-01 3.7176E-01 -4.6253E-01 -2.9560E-01 1.9298E+00 -3.1635E+00 S8 -2.2825E-02 1.1280E-01 -2.6935E-01 4.0658E-01 -4.0072E-01 2.6481E-01 -1.1821E-01 S9 -2.0930E-02 4.2997E-02 -8.4542E-02 1.1207E-01 -1.0106E-01 6.4333E-02 -2.9601E-02 S10 -3.5625E-02 -1.4787E-01 5.9147E-01 -1.0398E+00 1.0833E+00 -7.3711E-01 3.4464E-01 S11 4.6002E-02 8.5233E-03 2.5088E-01 -6.7780E-01 8.3950E-01 -6.3111E-01 3.1779E-01 S12 -3.0858E-02 1.6095E-01 -1.3432E-01 -7.3259E-03 1.1061E-01 -1.1307E-01 6.5564E-02 S13 -4.1024E-02 -1.3074E-02 8.3503E-02 -1.3835E-01 1.3390E-01 -8.6877E-02 4.0033E-02 S14 2.4258E-01 -7.9656E-01 1.1469E+00 -1.0689E+00 7.0155E-01 -3.3418E-01 1.1709E-01 S15 1.8884E-01 -5.5536E-01 7.1937E-01 -6.1931E-01 3.7565E-01 -1.6459E-01 5.2934E-02 S16 8.9965E-02 -4.1804E-02 -5.3570E-02 8.2570E-02 -5.9495E-02 2.8454E-02 -9.7449E-03

[0127] Table 8-1

[0128]

[0129]

[0130] Table 8-2

[0131] Figure 9A The axial chromatic aberration curve of the second optical system 210 of Example 1 is shown, which indicates the deviation of the convergent focus of light of different wavelengths passing through the lens. Figure 9B The astigmatism curve of the second optical system 210 of Example 1 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 9C The distortion curve of the second optical system 210 of Example 1 is shown, which represents the distortion value corresponding to different field angles. Figures 9A to 9C It can be seen that the second optical system 210 of Example 1 can achieve good imaging quality.

[0132] Example 2

[0133] The following reference Figures 10 to 11C Example 2 of the second optical system 200 according to the present application is described. Figure 10 FIG2 shows a schematic structural diagram of the second optical system 220 according to Example 2 of the present application.

[0134] like Figure 10 As shown, the second optical system 220 includes, in order from the first side to the second side along the second optical axis: a first lens element E1, a second lens element E2, a third lens element E3, an aperture STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an imaging surface S19. The focal lengths of the first lens element E1 and the second lens element E2 are negative, while the focal lengths of the third lens element E3, the fifth lens element E5, and the eighth lens element E8 are positive.

[0135] In this embodiment, the first side surface S1 of the first lens E1 is convex, and the second side surface S2 is concave. The first side surface S3 of the second lens E2 is concave, and the second side surface S4 is concave. The first side surface S5 of the third lens E3 is convex, and the second side surface S6 is concave. The first side surface S7 of the fourth lens E4 is concave, and the second side surface S8 is convex. The first side surface S9 of the fifth lens E5 is convex, and the second side surface S10 is convex. The first side surface S11 of the sixth lens E6 is concave, and the second side surface S12 is convex. The first side surface S13 of the seventh lens E7 is convex, and the second side surface S14 is concave. The first side surface S15 of the eighth lens E8 is convex, and the second side surface S16 is concave.

[0136] Table 9 shows the basic parameters of the second optical system 220 of Example 2, where the units of curvature radius and thickness are both in millimeters (mm). In this embodiment, the first and second side surfaces of the second lens E2 to the eighth lens E8 are all aspherical surfaces. Tables 10-1 and 10-2 show the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A4 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 . A 26 、A 30 and A 32 , wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 of the above-mentioned first optical system 100.

[0137]

[0138]

[0139] Table 9

[0140] Face number A4 A6 A8 A10 A12 A14 A16 S3 2.4749E-02 -2.0354E-02 1.5041E-02 -6.6346E-03 1.1927E-03 4.6231E-04 -4.1460E-04 S4 -2.6397E-02 3.1643E-01 -1.6599E+00 5.2063E+00 -1.1089E+01 1.6867E+01 -1.8700E+01 S5 2.7722E-02 1.7535E-02 -9.0120E-02 2.8815E-01 -6.5203E-01 1.2202E+00 -1.7927E+00 S6 1.0948E-01 -8.1821E-01 7.2367E+00 -4.0145E+01 1.5041E+02 -3.9461E+02 7.4167E+02 S7 7.8935E-03 -5.5373E-02 1.1968E-01 2.1473E-01 -1.7782E+00 4.5788E+00 -6.7263E+00 S8 -8.0735E-03 3.1855E-02 -6.7302E-02 1.0264E-01 -1.0541E-01 7.3416E-02 -3.4705E-02 S9 -1.9380E-02 3.5205E-02 -6.6315E-02 8.7277E-02 -7.8594E-02 4.9885E-02 -2.2798E-02 S10 -4.0519E-02 -1.0655E-01 4.7822E-01 -8.6436E-01 9.0682E-01 -6.1364E-01 2.8216E-01 S11 4.4952E-02 6.2806E-03 2.4931E-01 -6.7018E-01 8.3202E-01 -6.2797E-01 3.1748E-01 S12 -1.0249E-02 5.4935E-02 8.5152E-02 -2.8935E-01 3.5991E-01 -2.7136E-01 1.3932E-01 S13 -1.2997E-02 -9.8135E-02 2.2168E-01 -2.8316E-01 2.3889E-01 -1.4133E-01 6.0597E-02 S14 1.9468E-01 -6.2397E-01 8.5394E-01 -7.5281E-01 4.6532E-01 -2.0683E-01 6.6483E-02 S15 1.4255E-01 -4.4253E-01 5.8043E-01 -5.1382E-01 3.2368E-01 -1.4788E-01 4.9637E-02 S16 8.2154E-02 -4.1438E-02 -5.3353E-02 8.1304E-02 -5.6228E-02 2.5190E-02 -7.9203E-03

[0141] Table 10-1

[0142] Face number A18 A20 A22 A24 A26 A30 A32 S3 1.5367E-04 -3.5559E-05 5.5317E-06 -5.8103E-07 3.9660E-08 -1.5916E-09 2.8532E-11 S4 1.5226E+01 -9.0840E+00 3.9187E+00 -1.1880E+00 2.3977E-01 -2.8895E-02 1.5717E-03 S5 1.9513E+00 -1.5295E+00 8.4698E-01 -3.2247E-01 8.0220E-02 -1.1730E-02 7.6390E-04 S6 -1.0102E+03 9.9818E+02 -7.0802E+02 3.5116E+02 -1.1557E+02 2.2666E+01 -2.0046E+00 S7 6.2652E+00 -3.7728E+00 1.4269E+00 -3.0866E-01 2.9156E-02 0.0000E+00 0.0000E+00 S8 1.0948E-02 -2.2030E-03 2.5547E-04 -1.2980E-05 0.0000E+00 0.0000E+00 0.0000E+00 S9 7.5824E-03 -1.8357E-03 3.1988E-04 -3.9052E-05 3.1680E-06 -1.5328E-07 3.3457E-09 S10 -9.0458E-02 2.0344E-02 -3.1675E-03 3.2853E-04 -2.0895E-05 6.7436E-07 -5.8140E-09 S11 -1.1244E-01 2.8411E-02 -5.1166E-03 6.4305E-04 -5.3659E-05 2.6724E-06 -6.0094E-08 S12 -5.0875E-02 1.3403E-02 -2.5351E-03 3.3622E-04 -2.9704E-05 1.5708E-06 -3.7630E-08 S13 -1.9104E-02 4.4326E-03 -7.4804E-04 8.9326E-05 -7.1551E-06 3.4498E-07 -7.5704E-09 S14 -1.5320E-02 2.4656E-03 -2.6161E-04 1.5773E-05 -2.3638E-07 -2.8950E-08 1.3401E-09 S15 -1.2312E-02 2.2500E-03 -2.9892E-04 2.8054E-05 -1.7618E-06 6.6394E-08 -1.1348E-09 S16 1.7897E-03 -2.9080E-04 3.3403E-05 -2.6118E-06 1.2932E-07 -3.5022E-09 3.5474E-11

[0143] Table 10-2

[0144] Figure 11A The axial chromatic aberration curve of the second optical system 220 of Example 2 is shown, which indicates the deviation of the convergent focus of light of different wavelengths passing through the lens. Figure 11B The astigmatism curve of the second optical system 220 of Example 2 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 11C The distortion curve of the second optical system 220 of Example 2 is shown, which represents the distortion value corresponding to different field angles. Figures 11A to 11C It can be seen that the second optical system 220 of Example 2 can achieve good imaging quality.

[0145] Example 3

[0146] The following reference Figures 12 to 13C Example 3 of the second optical system 200 according to the present application is described. Figure 12 FIG. 2 shows a schematic structural diagram of the second optical system 230 according to Example 3 of the present application.

[0147] like Figure 12 As shown, the second optical system 230 includes, in order from the first side to the second side along the second optical axis: a first lens element E1, a second lens element E2, a third lens element E3, an aperture STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an imaging surface S19. The focal lengths of the first lens element E1 and the second lens element E2 are negative, while the focal lengths of the third lens element E3, the fifth lens element E5, and the eighth lens element E8 are positive.

[0148] In this embodiment, the first side surface S1 of the first lens E1 is convex, and the second side surface S2 is concave. The first side surface S3 of the second lens E2 is convex, and the second side surface S4 is concave. The first side surface S5 of the third lens E3 is concave, and the second side surface S6 is convex. The first side surface S7 of the fourth lens E4 is concave, and the second side surface S8 is convex. The first side surface S9 of the fifth lens E5 is concave, and the second side surface S10 is convex. The first side surface S11 of the sixth lens E6 is convex, and the second side surface S12 is convex. The first side surface S13 of the seventh lens E7 is concave, and the second side surface S14 is concave. The first side surface S15 of the eighth lens E8 is convex, and the second side surface S16 is convex.

[0149] Table 11 shows the basic parameters of the second optical system 230 of Example 3, where the units of curvature radius and thickness are millimeters (mm). In this embodiment, the first and second side surfaces of the second lens E2 to the eighth lens E8 are all aspherical surfaces. Tables 12-1 and 12-2 show the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 、A 12 、A 14 、A 16 、A 18 and A 20 , wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 of the above-mentioned first optical system 100.

[0150]

[0151] Table 11

[0152]

[0153]

[0154] Table 12-1

[0155] Face number A14 A16 A18 A20 S3 -1.6793E-04 1.5336E-05 -8.1959E-07 1.9553E-08 S4 2.1089E-01 -7.8554E-02 1.6272E-02 -1.4261E-03 S5 5.5975E-02 -2.2396E-02 4.9452E-03 -4.6351E-04 S6 1.3946E-01 -5.9444E-02 1.3962E-02 -1.3805E-03 S7 -1.1439E-01 4.3571E-02 -9.1055E-03 8.0082E-04 S8 -3.0386E-01 1.0543E-01 -2.0308E-02 1.6967E-03 S9 -2.1477E-01 5.8548E-02 -7.8036E-03 3.3792E-04 S10 -3.9088E-02 1.1788E-02 -1.8424E-03 1.1343E-04 S11 4.5873E-03 -8.5599E-04 7.7932E-05 -1.8613E-06 S12 3.8783E-02 -6.5168E-03 5.9403E-04 -2.1177E-05 S13 5.0798E-02 -9.8226E-03 1.0831E-03 -5.1747E-05 S14 3.0900E-03 -5.5997E-04 5.8444E-05 -2.6926E-06 S15 7.2673E-05 -4.4710E-05 9.8568E-06 -7.4228E-07 S16 -1.4332E-03 2.6776E-04 -2.8491E-05 1.3248E-06

[0156] Table 12-2

[0157] Figure 13A The axial chromatic aberration curve of the second optical system 230 of Example 3 is shown, which indicates the deviation of the convergent focus of light of different wavelengths passing through the lens. Figure 13B The astigmatism curve of the second optical system 230 of Example 3 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 13C The distortion curve of the second optical system 230 of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. 13A to 13C It can be seen that the second optical system 230 of Example 3 can achieve good imaging quality.

[0158] Example 4

[0159] The following reference Figures 14 to 15C Example 4 of the second optical system 200 according to the present application is described. Figure 14 A schematic structural diagram of the second optical system 240 according to Example 4 of the present application is shown.

[0160] like Figure 14 As shown, the second optical system 240 includes, in order from the first side to the second side along the second optical axis: a first lens element E1, a second lens element E2, a third lens element E3, an aperture STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an imaging surface S19. The focal lengths of the first lens element E1 and the second lens element E2 are negative, while the focal lengths of the third lens element E3, the fifth lens element E5, and the eighth lens element E8 are positive.

[0161] In this embodiment, the first side surface S1 of the first lens E1 is convex, and the second side surface S2 is concave. The first side surface S3 of the second lens E2 is concave, and the second side surface S4 is concave. The first side surface S5 of the third lens E3 is convex, and the second side surface S6 is concave. The first side surface S7 of the fourth lens E4 is concave, and the second side surface S8 is convex. The first side surface S9 of the fifth lens E5 is convex, and the second side surface S10 is convex. The first side surface S11 of the sixth lens E6 is concave, and the second side surface S12 is convex. The first side surface S13 of the seventh lens E7 is convex, and the second side surface S14 is convex. The first side surface S15 of the eighth lens E8 is convex, and the second side surface S16 is concave.

[0162] Table 13 shows the basic parameters of the second optical system 240 of Example 4, where the units of curvature radius and thickness are both in millimeters (mm). In this embodiment, the first and second side surfaces of the second lens E2 to the eighth lens E8 are all aspherical surfaces. Tables 14-1 and 14-2 show the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A 10 、A12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 . A 26 、A 30 and A 32 , wherein each aspheric surface shape can be defined by the formula (1) given in Example 1 of the above-mentioned first optical system 100.

[0163]

[0164]

[0165] Table 13

[0166] Face number A4 A6 A8 A10 A12 A14 A16 S3 -1.5965E-02 4.5647E-02 -5.2534E-02 3.9717E-02 -2.0920E-02 7.9151E-03 -2.1897E-03 S4 -1.5256E-01 8.6505E-01 -4.2147E+00 1.3628E+01 -2.9727E+01 4.4993E+01 -4.8309E+01 S5 -3.0903E-02 2.2309E-01 -1.0681E+00 3.6822E+00 -8.7956E+00 1.4700E+01 -1.7409E+01 S6 6.1697E-02 -3.6611E-01 3.4696E+00 -1.8977E+01 6.7859E+01 -1.6701E+02 2.9173E+02 S7 6.6803E-02 -5.8907E-01 2.6225E+00 -7.1820E+00 1.2897E+01 -1.5739E+01 1.3264E+01 S8 -3.3145E-02 1.1676E-01 -2.6030E-01 3.9433E-01 -4.0044E-01 2.7434E-01 -1.2675E-01 S9 -2.9641E-02 6.5280E-02 -1.2955E-01 1.9017E-01 -2.0105E-01 1.5424E-01 -8.6378E-02 S10 -5.4585E-02 1.5692E-02 -3.9924E-02 2.6351E-01 -5.9644E-01 7.3350E-01 -5.7013E-01 S11 7.4787E-02 5.1808E-02 -1.4689E-01 3.2453E-01 -5.8815E-01 6.9999E-01 -5.4578E-01 S12 2.3580E-02 4.9432E-02 -6.7780E-02 8.3898E-02 -1.1669E-01 1.2073E-01 -8.3388E-02 S13 -3.8238E-02 -3.9150E-02 6.0132E-02 -8.7127E-05 -7.7143E-02 9.7084E-02 -6.5790E-02 S14 8.4883E-02 -3.7072E-01 6.3274E-01 -7.1960E-01 5.9293E-01 -3.6206E-01 1.6499E-01 S15 2.7100E-02 -2.3237E-01 3.4546E-01 -3.2515E-01 2.1352E-01 -1.0136E-01 3.5451E-02 S16 5.7493E-02 -1.0062E-01 8.2892E-02 -5.3359E-02 2.5473E-02 -8.1626E-03 1.4410E-03

[0167] Table 14-1

[0168] Face number A18 A20 A22 A24 A26 A30 A32 S3 4.4630E-04 -6.6874E-05 7.2702E-06 -5.5738E-07 2.8550E-08 -8.7632E-10 1.2183E-11 S4 3.7275E+01 -2.0723E+01 8.2239E+00 -2.2719E+00 4.1499E-01 -4.5047E-02 2.2001E-03 S5 1.4746E+01 -8.9473E+00 3.8540E+00 -1.1499E+00 2.2589E-01 -2.6277E-02 1.3714E-03 S6 -3.6751E+02 3.3517E+02 -2.1932E+02 1.0039E+02 -3.0520E+01 5.5354E+00 -4.5324E-01 S7 -7.7125E+00 3.0323E+00 -7.6791E-01 1.1273E-01 -7.2602E-03 0.0000E+00 0.0000E+00 S8 3.8791E-02 -7.5062E-03 8.2699E-04 -3.9218E-05 0.0000E+00 0.0000E+00 0.0000E+00 S9 3.5279E-02 -1.0407E-02 2.1699E-03 -3.0733E-04 2.7498E-05 -1.3435E-06 2.4587E-08 S10 2.9892E-01 -1.0876E-01 2.7602E-02 -4.8064E-03 5.4855E-04 -3.7021E-05 1.1218E-06 S11 2.8823E-01 -1.0533E-01 2.6733E-02 -4.6351E-03 5.2451E-04 -3.4959E-05 1.0423E-06 S12 3.9038E-02 -1.2625E-02 2.8306E-03 -4.3256E-04 4.3035E-05 -2.5145E-06 6.5503E-08 S13 2.8969E-02 -8.7718E-03 1.8517E-03 -2.6877E-04 2.5638E-05 -1.4498E-06 3.6884E-08 S14 -5.6049E-02 1.4082E-02 -2.5727E-03 3.3134E-04 -2.8454E-05 1.4598E-06 -3.3796E-08 S15 -9.2004E-03 1.7660E-03 -2.4713E-04 2.4476E-05 -1.6237E-06 6.4663E-08 -1.1679E-09 S16 1.8567E-05 -8.3743E-05 2.3461E-05 -3.5193E-06 3.1365E-07 -1.5668E-08 3.3917E-10

[0169] Table 14-2

[0170] Figure 15A The axial chromatic aberration curve of the second optical system 240 of Example 4 is shown, which indicates the deviation of the convergent focus of light of different wavelengths passing through the lens. Figure 15B The astigmatism curve of the second optical system 240 of Example 4 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 15C The distortion curve of the second optical system 240 of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figures 15A to 15C It can be seen that the second optical system 240 of Example 4 can achieve good imaging quality.

[0171] In addition, in Examples 1 to 3 of the first optical system 100, the total optical length TTLm, the field of view FOVm, the effective focal length fm, the effective focal length f1m of the first lens E'1, the effective focal length f2m of the second lens E'2, and the effective focal length f3m of the third lens E'3 are as shown in Table 15.

[0172] Basic data / Example 1 2 3 TTLm(mm) 12.08 18.21 18.28 FOVm 70.0 70.0 70.0 fm(mm) 11.77 16.35 20.26 f1m(mm) / 49.41 63.64 f2m(mm) 48.84 -90.94 -85.57 f3m(mm) 198.23 45.30 46.25

[0173] Table 15

[0174] In Examples 1 to 4 of the second optical system 200, the total optical length TTL, the field of view FOV, the effective focal length f, the effective focal length f1 of the first lens element E1, the effective focal length f2 of the second lens element E2, the effective focal length f3 of the third lens element E3, the effective focal length f4 of the fourth lens element E4, the effective focal length f5 of the fifth lens element E5, the effective focal length f6 of the sixth lens element E6, the effective focal length f7 of the seventh lens element E7, and the effective focal length f8 of the eighth lens element E8 are as shown in Table 16.

[0175] Basic data / Example 1 2 3 4 TTL(mm) 15.34 15.84 14.27 14.75 FOV 216.1 203.0 214.0 214.0 f(mm) 1.69 1.54 1.71 1.69 f1(mm) -8.14 -7.15 -9.36 -10.12 f2(mm) -3.49 -3.25 -4.41 -3.30 f3(mm) 7.65 7.09 10.12 7.44 f4(mm) 5.68 5.47 -125.49 5.32 f5(mm) 5.26 5.15 10.31 5.47 f6(mm) -3.50 -3.47 2.96 -3.47 f7(mm) 7.63 7.69 -2.18 5.86 f8(mm) 5.50 4.73 3.48 6.54

[0176] Table 16

[0177] Combining the first to third embodiments of the first optical system 100 with the first to fourth embodiments of the second optical system 200 respectively forms 12 embodiments of the virtual reality system 1000.

[0178] The first embodiment of the virtual reality system 1000 is formed by combining the first embodiment of the first optical system 100 and the first embodiment of the second optical system 200 described above.

[0179] The second embodiment of the virtual reality system 1000 is formed by combining the second embodiment of the first optical system 100 and the first embodiment of the second optical system 200 described above.

[0180] The third embodiment of the virtual reality system 1000 is formed by combining the third embodiment of the first optical system 100 and the first embodiment of the second optical system 200.

[0181] The fourth embodiment of the virtual reality system 1000 is formed by combining the first embodiment of the first optical system 100 and the second embodiment of the second optical system 200.

[0182] The fifth embodiment of the virtual reality system 1000 is formed by combining the second embodiment of the first optical system 100 and the second embodiment of the second optical system 200 described above.

[0183] The sixth embodiment of the virtual reality system 1000 is formed by combining the third embodiment of the first optical system 100 and the second embodiment of the second optical system 200.

[0184] The seventh embodiment of the virtual reality system 1000 is formed by combining the first embodiment of the first optical system 100 and the third embodiment of the second optical system 200.

[0185] The eighth embodiment of the virtual reality system 1000 is formed by combining the second embodiment of the first optical system 100 and the third embodiment of the second optical system 200.

[0186] The ninth embodiment of the virtual reality system 1000 is formed by combining the third embodiment of the first optical system 100 and the third embodiment of the second optical system 200.

[0187] Embodiment 10 of the virtual reality system 1000 is formed by combining the embodiment 1 of the first optical system 100 and the embodiment 4 of the second optical system 200 described above.

[0188] Embodiment 11 of the virtual reality system 1000 is formed by combining the embodiment 2 of the first optical system 100 and the embodiment 4 of the second optical system 200 described above.

[0189] The twelfth embodiment of the virtual reality system 1000 is formed by combining the third embodiment of the first optical system 100 and the fourth embodiment of the second optical system 200 described above.

[0190] The conditional expressions of Examples 1 to 12 of the virtual reality system 1000 satisfy the conditions shown in Table 17-1 and Table 17-2.

[0191] Conditional formula / Example 1 2 3 4 5 6 BFL / BL 2.04 2.25 3.78 1.87 2.06 3.47 fm / [f*tan(FOV / 2)] -2.27 -3.16 -3.91 -1.56 -2.17 -2.68 ∑CTm / ∑CT 1.11 1.69 1.42 1.05 1.61 1.35 (fm-TDm) / (f-TD) -0.06 0.08 -0.21 -0.05 0.08 -0.20 [R16*tan(FOV / 2)] / [R6m*tan(FOVm / 2)] -0.66 -0.33 -0.14 -0.96 -0.47 -0.20 f3m / fm 16.85 2.77 2.28 16.85 2.77 2.28 T23m*V3m / (f2m-f3m) -0.17 -0.42 -0.30 -0.17 -0.42 -0.30 (CT2m+CT3m)*(N2m+Ns) / |R4m+R6m| 0.39 0.06 0.05 0.39 0.06 0.05 (CT1m+CT2m)*V1m / |R3m| 5.90 10.37 12.11 5.90 10.37 12.11 (DT11m+DT22m) / [(N1m+N2m)*CTf] 51.44 54.86 54.94 51.44 54.86 54.94 f3 / f 4.52 4.52 4.52 4.61 4.61 4.61 |f3+f4| / (f3-f4) 6.79 6.79 6.79 7.77 7.77 7.77 f8 / (R15+R16) 0.77 0.77 0.77 0.74 0.74 0.74 f8 / f 3.25 3.25 3.25 3.08 3.08 3.08 |f6-f7| / [T67*(V6+V7)] 4.17 4.17 4.17 6.55 6.55 6.55 N6 / N7 1.08 1.08 1.08 1.08 1.08 1.08 f6 / f7 -0.46 -0.46 -0.46 -0.45 -0.45 -0.45 f1234 / (f3+f4) 0.66 0.66 0.66 0.76 0.76 0.76 N5 / (N4+N6) 0.504 0.504 0.504 0.504 0.504 0.504 f / f5678 0.36 0.36 0.36 0.36 0.36 0.36 (R9+R10) / (R7+R8) 0.10 0.10 0.10 0.15 0.15 0.15

[0192] Table 17-1

[0193]

[0194]

[0195] Table 17-2

[0196] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of protection provided in this application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of this application. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A virtual reality system, characterized in that: include: The first optical system comprises, in order from the first side to the second side along the first optical axis: First lens; a reflective polarizing element, bonded to the second side surface of the first lens; Second lens; a quarter-wave plate, bonded to the second side surface of the second lens; a third lens having a positive focal length and a convex second side surface; and Light source display; The second optical system includes, in order from the first side to the second side along the second optical axis: a first lens having a negative focal length, a convex first side surface, and a concave second side surface; a second lens having a negative focal length and a concave second side surface; A third lens having a positive focal length; a fourth lens having a first side surface that is concave and a second side surface that is convex; a fifth lens element having a positive focal length and a convex second side surface; a sixth lens, the second side of which is a convex surface; a seventh lens; and an eighth lens element having a positive focal length and a convex first side surface; The number of lenses in the first optical system is three; the number of lenses with optical power in the second optical system is eight; The first optical system further includes a partial reflective layer, wherein the partial reflective layer is located on the first side surface or the second side surface of the third lens; The first side surface and the second side surface of the first lens are planes, and the focal length of the second lens is positive; or the focal length of the first lens is positive, and the focal length of the second lens is negative; The focal lengths of the fourth lens and the seventh lens are positive, and the focal length of the sixth lens is negative; or, the focal lengths of the fourth lens and the seventh lens are negative, and the focal length of the sixth lens is positive; The distance BFL from the second side surface of the eighth lens of the second optical system to the imaging plane on the second optical axis, the distance BL from the second side surface of the third lens of the first optical system to the light source display on the first optical axis, the effective focal length fm of the first optical system, the effective focal length f of the second optical system, the field of view FOV of the second optical system, the air gap T23m between the quarter wave plate and the third lens of the first optical system on the first optical axis, the chromatic aberration coefficient V3m of the third lens of the first optical system, the combined focal length f2m of the second lens and the quarter wave plate of the first optical system, and the effective focal length f3m of the third lens of the first optical system satisfy the following requirements: <h2 style=";text-align:left;direction:ltr">1.72≤BFL / BL≤4.55,-3.91≤fm / [f<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> tan(FOV / 2)]≤-1.56;-0.42≤T23m<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> V3m / (f2m-f3m)≤-0.17。 2. The virtual reality system according to claim 1, wherein: The sum of the thicknesses ΣCTm of the first lens to the third lens of the first optical system on the first optical axis and the sum of the thicknesses ΣCT of the first lens to the eighth lens of the second optical system on the second optical axis satisfy: 1.05≤∑CTm / ∑CT≤2.

00.

3. The virtual reality system according to claim 1, wherein: The effective focal length fm of the first optical system, the distance TDm from the first side surface of the first lens of the first optical system to the second side surface of the third lens on the first optical axis, the effective focal length f of the second optical system, and the distance TD from the first side surface of the first lens of the second optical system to the second side surface of the eighth lens on the second optical axis satisfy the following conditions: -0.24≤(fm-TDm) / (f-TD)≤0.

10.

4. The virtual reality system according to claim 1, wherein: The curvature radius R16 of the second side surface of the eighth lens of the second optical system, the field of view FOV of the second optical system, the curvature radius R6m of the second side surface of the third lens of the first optical system and the field of view FOVm of the first optical system satisfy: <h2 style=";text-align:left;direction:ltr">-0.99<[R16<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> tan(FOV / 2)] / [R6m<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> tan(FOVm / 2)]≤-0.09。 5. The virtual reality system according to any one of claims 1 to 4, characterized in that: The effective focal length f3m of the third lens of the first optical system and the effective focal length fm of the first optical system satisfy: 2.28≤f3m / fm≤16.

85.

6. The virtual reality system according to any one of claims 1 to 4, characterized in that: A center thickness CT2m of the second lens of the first optical system on the first optical axis, a center thickness CT3m of the third lens of the first optical system on the first optical axis, a refractive index N2m of the second lens of the first optical system, a refractive index Ns of the quarter-wave plate of the first optical system, a curvature radius R4m of the second side surface of the second lens of the first optical system, and a curvature radius R6m of the second side surface of the third lens of the first optical system satisfy the following conditions: 0.01<(CT2m+CT3m) (N2m+Ns) / |R4m+R6m|≤0.39。 7. The virtual reality system according to any one of claims 1 to 4, characterized in that: A center thickness CT1m of the first lens of the first optical system on the first optical axis, a center thickness CT2m of the second lens of the first optical system on the first optical axis, an Abbe coefficient V1m of the first lens of the first optical system, and a curvature radius R3m of a first side surface of the second lens of the first optical system satisfy: 5.90≤(CT1m+CT2m) V1m / |R3m|≤12.11。 8. The virtual reality system according to any one of claims 1 to 4, characterized in that: The maximum effective radius DT11m of the first side surface of the first lens of the first optical system, the maximum effective radius DT22m of the second side surface of the second lens of the first optical system, the refractive index N1m of the first lens of the first optical system, the refractive index N2m of the second lens of the first optical system, and the center thickness CTf of the reflective polarizing element of the first optical system on the first optical axis satisfy the following conditions: 51.44≤(DT11m+DT22m) / [(N1m+N2m) CTf]≤54.94。 9. The virtual reality system according to any one of claims 1 to 4, characterized in that: The effective focal length f of the second optical system, the effective focal length f3 of the third lens of the second optical system, and the effective focal length f4 of the fourth lens of the second optical system satisfy: 4.41≤f3 / f≤5.93, 0.85≤|f3+f4| / (f3-f4)≤7.

77.

10. The virtual reality system according to any one of claims 1 to 4, characterized in that: The effective focal length f8 of the eighth lens of the second optical system, the curvature radius R15 of the first side surface of the eighth lens of the second optical system, the curvature radius R16 of the second side surface of the eighth lens of the second optical system and the effective focal length f of the second optical system satisfy: 0.74≤f8 / (R15+R16)≤2.77, 2.04≤f8 / f≤3.

87.

11. The virtual reality system according to any one of claims 1 to 4, characterized in that: The effective focal length f6 of the sixth lens of the second optical system, the effective focal length f7 of the seventh lens of the second optical system, the air gap T67 between the sixth lens and the seventh lens of the second optical system on the second optical axis, the Abbe coefficient V6 of the sixth lens of the second optical system, and the Abbe coefficient V7 of the seventh lens of the second optical system satisfy: 1.02≤|f6-f7| / [T67 (V6+V7)]≤6.

55.

12. The virtual reality system according to any one of claims 1 to 4, characterized in that: The refractive index N6 of the sixth lens of the second optical system, the refractive index N7 of the seventh lens of the second optical system, the effective focal length f6 of the sixth lens of the second optical system, and the effective focal length f7 of the seventh lens of the second optical system satisfy: 0.91≤N6 / N7≤1.08,-1.36≤f6 / f7≤-0.

45.

13. The virtual reality system according to any one of claims 1 to 4, characterized in that: The combined focal length f1234 of the first to fourth lenses of the second optical system, the effective focal length f3 of the third lens of the second optical system, and the effective focal length f4 of the fourth lens of the second optical system satisfy: 0.05≤f1234 / (f3+f4)≤0.

76.

14. The virtual reality system according to any one of claims 1 to 4, characterized in that: The fifth lens of the second optical system is a glass lens, and the refractive index N4 of the fourth lens of the second optical system, the refractive index N5 of the fifth lens of the second optical system, the refractive index N6 of the sixth lens of the second optical system, and the chromatic aberration coefficient V5 of the fifth lens of the second optical system satisfy: 0.504≤N5 / (N4+N6)≤0.537, 53.15≤V5≤63.

88.

15. The virtual reality system according to any one of claims 1 to 4, characterized in that: The effective focal length f of the second optical system and the combined focal length f5678 of the fifth to eighth lenses of the second optical system satisfy: 0.36≤f / f5678<0.

5.

16. The virtual reality system according to any one of claims 1 to 4, characterized in that: The curvature radius R9 of the first side surface of the fifth lens of the second optical system, the curvature radius R10 of the second side surface of the fifth lens of the second optical system, the curvature radius R7 of the first side surface of the fourth lens of the second optical system, and the curvature radius R8 of the second side surface of the fourth lens of the second optical system satisfy: 0.07≤(R9+R10) / (R7+R8)≤0.17.

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