Virtual reality system

Abstract

The present application discloses a virtual reality system, which includes a visual optical system and a positioning optical system. The visual optical system sequentially includes a first element group, a second element group, a third element group, and a fourth element group along a first optical axis from a first side to a second side. The first element group includes a reflective polarizing element, a first quarter-wave plate, and a first lens. The second element group includes a second quarter-wave plate and a second lens. The third element group includes a third lens. The fourth element group includes a fourth lens. The positioning optical system sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens along a second optical axis from an object side to an image side. The total effective focal length f' of the visual optical system, the curvature radius R2' of the second side of the first lens, and the curvature radius R8' of the second side of the fourth lens satisfy: 1.0 mm < f' / (R2' / R8') < 5.0 mm. The total effective focal length f of the positioning optical system, the curvature radius R2 of the image side of the first lens, and the curvature radius R10 of the image side of the fifth lens satisfy: -6.0 mm < f / (R2 / R10) < -1.0 mm.

Description

Technical Field

[0001] This application relates to the field of optical devices, and particularly to a virtual reality system. Background Art

[0002] For a virtual reality system, a visual system enables a user to enter a virtual world, and a positioning system captures the user's actions. When paired with the visual system, it can connect the real world and the virtual world to achieve interaction between the real world and the virtual world, thus bringing an immersive experience to the user.

[0003] The first lens and the last lens in the visual system and the positioning system are located at the edge of the lens group, which are relatively sensitive and have a crucial impact on correcting aberration and field curvature. However, the optical power or surface shape of these two lenses in the visual system and the positioning system are likely to be set unreasonably. When the optical power or surface shape of the above lenses are set unreasonably, it will cause the visual system and the positioning system to have large aberrations, and the performance of the virtual reality system will deteriorate, thus affecting the user's immersion. Summary of the Invention

[0004] This application provides a virtual reality system that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0005] One aspect of this application provides such a virtual reality system, which includes a visual optical system and a positioning optical system. The visual optical system sequentially includes a first element group, a second element group, a third element group, and a fourth element group along a first optical axis from a first side to a second side. The first element group includes a reflective polarizing element, a first quarter-wave plate, and a first lens with positive optical power. The second element group includes a second quarter-wave plate and a second lens. The third element group includes a third lens. The fourth element group includes a fourth lens with positive optical power. The positioning optical system sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens along a second optical axis from an object side to an image side. Among them, the first lens has negative optical power, and the fifth lens has positive or negative optical power. The total effective focal length f' of the visual optical system, the curvature radius R2' of the second side of the first lens, and the curvature radius R8' of the second side of the fourth lens satisfy: 1.0 mm < f' / (R2' / R8') < 5.0 mm; and the total effective focal length f of the positioning optical system, the curvature radius R2 of the image side of the first lens, and the curvature radius R10 of the image side of the fifth lens satisfy: -6.0 mm < f / (R2 / R10) < -1.0 mm.

[0006] According to an exemplary embodiment of this application, the total effective focal length f' of the visual optical system, the maximum field of view FOV' of the visual optical system, the total effective focal length f of the positioning optical system and the maximum field of view FOV of the positioning optical system satisfy: 0.5 < (f' × tan(FOV' / 2)) / (f × tan(FOV / 2)) < 2.5.

[0007] According to an exemplary embodiment of this application, the entrance pupil diameter EPD' of the visual optics system and the entrance pupil diameter EPD of the positioning optics system satisfy: 6.5 <EPD' / EPD<8.0。

[0008] According to an exemplary embodiment of this application, the axial distance TD' from the first side surface of the first lens to the second side surface of the fourth lens and the axial distance TTL from the object side surface of the first lens to the imaging surface of the positioning optical system satisfy: 1.3 <TD' / TTL<1.8。

[0009] According to an exemplary embodiment of this application, the total effective focal length f' of the visual optical system and the total effective focal length f of the positioning optical system satisfy: 9.0 <f' / f<13.0。

[0010] According to an exemplary embodiment of this application, the sum of the center thicknesses of each of the first to fourth lenses on the first optical axis, ∑CT', and the sum of the center thicknesses of each of the first to fifth lenses on the second optical axis, ∑CT, satisfy: 3.0 < ∑CT' / ∑CT < 5.0.

[0011] According to an exemplary embodiment of this application, the effective focal length f3' of the third element group, the effective focal length f4' of the fourth element group, the refractive index N3' of the third lens, the refractive index N4' of the fourth lens, the center thickness CT3' of the third lens on the first optical axis, and the center thickness CT4' of the fourth lens on the first optical axis satisfy: -2.0<(f3'+f4')×(N3'-N4') / (CT3'+CT4')<0.

[0012] According to an exemplary embodiment of this application, the effective focal length f1' of the first element group, the refractive index N1' of the first lens, the refractive index NR of the reflective polarizing element, and the refractive index NQ1 of the first quarter-wave plate satisfy: 10.0 mm <f1' / (NR+NQ1)+f1' / N1'<15.0mm。

[0013] According to an exemplary embodiment of this application, the effective focal length f3' of the third element group, the effective focal length f4' of the fourth element group, the radius of curvature R6' of the second side surface of the third lens, and the radius of curvature R8' of the second side surface of the fourth lens satisfy: -1.0 <f3' / R6'-f4' / R8'<0。

[0014] According to an exemplary embodiment of this application, the effective focal length f2' of the second element group, the effective focal length f3' of the third element group, and the total effective focal length f' of the visual optical system satisfy: -15.0 < (f2' + f3') / f' < -8.0.

[0015] According to an exemplary embodiment of this application, the air gap T23' between the second and third element groups on the first optical axis, the air gap T34' between the third and fourth element groups on the first optical axis, the dispersion coefficient V2' of the second lens, the dispersion coefficient VQ2 of the second quarter-wave plate, the dispersion coefficient V3' of the third lens, and the dispersion coefficient V4' of the fourth lens satisfy: 1.0 mm <T23'×(V2'+VQ2)-T34'×(V3'+V4')<2.0mm。

[0016] According to an exemplary embodiment of this application, a fifth element group is disposed on the image plane, and the total effective focal length f' of the visual optical system, the center thickness CT4' of the fourth lens on the first optical axis, and the air gap T4Q between the fourth and fifth element groups on the first optical axis satisfy: -3.0 <f' / (CT4'+T4Q)<7.0。

[0017] According to an exemplary embodiment of this application, the total effective focal length f of the positioning optical system and the effective focal length f1 of the first lens satisfy: -0.5 <f / f1<0。

[0018] According to an exemplary embodiment of this application, the total effective focal length f of the positioning optical system, the radius of curvature R1 of the object side of the first lens, and the radius of curvature R2 of the image side of the first lens satisfy: 0 <f / (R1-R2)<0.5。

[0019] According to an exemplary embodiment of this application, the effective focal length of the third lens is greater than zero, and the effective focal length f3 of the third lens, the combined focal length f45 of the fourth and fifth lenses, the air gap T34 of the third and fourth lenses on the second optical axis, the dispersion coefficient V3 of the third lens, the dispersion coefficient V4 of the fourth lens, and the dispersion coefficient V5 of the fifth lens satisfy: 0 < (f3 + f45) / (T34 × (V3 + V4 + V5)) < 4.0.

[0020] According to an exemplary embodiment of this application, the effective focal length of the second lens is less than zero, and the center thickness CT2 of the second lens on the second optical axis, the air gap T23 between the second and third lenses on the second optical axis, the effective focal length f2 of the second lens, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy: -3.0mm<(CT2+T23)×f2 / |(R3+R4)|<0mm.

[0021] According to an exemplary embodiment of this application, the center thickness CT4 of the fourth lens on the second optical axis, the effective focal length f4 of the fourth lens, the refractive index N4 of the fourth lens, the center thickness CT5 of the fifth lens on the second optical axis, the effective focal length f5 of the fifth lens, the refractive index N5 of the fifth lens, and the combined focal length f45 of the fourth and fifth lenses satisfy: (CT4+CT5) / |(f4+f5)×N4+f45×N5|<1.5.

[0022] According to an exemplary embodiment of this application, the center thickness CT3 of the third lens on the second optical axis, the radius of curvature R5 of the object side of the third lens, and the radius of curvature R6 of the image side of the third lens satisfy: CT3 / |R5-R6|<1.0.

[0023] According to an exemplary embodiment of this application, the maximum field of view (FOV) of the positioning optical system satisfies: FOV > 165.0°.

[0024] According to an exemplary embodiment of this application, the total effective focal length f of the positioning optical system, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -0.5 <f / f2+f / f3<0.5。

[0025] The virtual reality system provided in this application is configured as a combination of a visual optical system and a positioning optical system. By constraining the focal length and corresponding radius of curvature of the lenses closest to the first and second sides in the visual optical system, and the focal length and corresponding radius of curvature of the lenses closest to the object and image sides in the positioning optical system, it is beneficial to improve the aberrations and field curvature of the visual optical system and the positioning optical system, and improve the performance of the virtual reality system. At the same time, the combination of the virtual immersion of the visual optical system and the positioning function of the positioning optical system breaks through the spatial limitations of the virtual reality system and realizes the interaction between the real world and the virtual world of the virtual optical system. Attached Figure Description

[0026] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. In the drawings:

[0027] Figure 1 A schematic diagram of the structure of a virtual reality system according to this application is shown;

[0028] Figure 2 A schematic diagram of the optical path of the visual optical system according to this application is shown;

[0029] Figure 3 A schematic diagram of the visual optical system according to Embodiment 1 of this application is shown;

[0030] Figures 4A to 4C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual optical system according to Embodiment 1 of this application are shown respectively.

[0031] Figure 5 A schematic diagram of the visual optical system according to Embodiment 2 of this application is shown;

[0032] Figures 6A to 6C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual optical system according to Embodiment 2 of this application are shown respectively.

[0033] Figure 7 A schematic diagram of the visual optical system according to Embodiment 3 of this application is shown;

[0034] Figures 8A to 8C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual optical system according to Embodiment 3 of this application are shown respectively.

[0035] Figure 9 A schematic diagram of the positioning optical system according to Embodiment 4 of this application is shown;

[0036] Figures 10A to 10C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the positioning optical system according to Embodiment 4 of this application are shown respectively.

[0037] Figure 11 A schematic diagram of the positioning optical system according to Embodiment 5 of this application is shown;

[0038] Figures 12A to 12C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the positioning optical system according to Embodiment 5 of this application are shown respectively.

[0039] Figure 13 A schematic diagram of the positioning optical system according to Embodiment Six of this application is shown;

[0040] Figures 14A to 14C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the positioning optical system according to Embodiment Six of this application are shown respectively.

[0041] Figure 15 A schematic diagram of the positioning optical system according to Embodiment 7 of this application is shown; and

[0042] Figures 16A to 16C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the positioning optical system according to Embodiment 7 of this application are shown respectively. Detailed Implementation

[0043] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

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

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

[0046] In this document, the paraxial region refers to the region near the optical axis. If the lens and / or lens surface is convex and the location of the convexity is not defined, it means that the lens and / or lens surface is convex at least in the paraxial region; if the lens and / or lens surface is concave and the location of the concaveness is not defined, it means that the lens and / or lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side (e.g., the human eye side) is called the first side surface of the lens, and the surface of each lens closest to the second side (e.g., the display side) is called the second side surface of the lens. The surface of each lens closest to the object being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging plane is called the image side surface of the lens.

[0047] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising" as used in this specification indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0048] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] The features, principles and other aspects of this application are described in detail below.

[0051] refer to Figure 1 The first aspect of this application provides a virtual reality system that may include a visual optical system and a positioning optical system. The positioning optical system is used to capture the user's body movements (e.g., a controller in the user's hand), and the resulting real image is transmitted to the visual optical system as an electrical signal. The visual optical system is used to project a virtual image onto an image surface positioned on a second side. The number of visual optical systems and the number of positioning optical systems may be one or more. In one example, the virtual reality system may include two symmetrically arranged visual optical systems. It should be understood that the virtual reality system provided in this application may also include any optical system other than the visual optical system and the positioning optical system, such as a first optical system.

[0052] The visual optical system in this application transmits virtual images from the display to the user's eyes, providing a sense of virtual immersion. The positioning optical system collects position data of the controller in the user's hands and transmits this data via a chip to the display of the visual optical system. The visual optical system then transmits the controller's position data from the display to the user, helping them determine the position of their hands on the screen. This virtual reality system combines the immersive experience of the visual optical system with the positioning function of the positioning optical system, breaking through the spatial limitations of virtual reality systems and enabling interaction between the real and virtual worlds.

[0053] In an exemplary embodiment, the visual optical system may include a first element group, a second element group, a third element group, and a fourth element group arranged sequentially along a first optical axis from a first side to a second side. The first element group may, for example, include a reflective polarizing element, a first quarter-wave plate, and a first lens. The second element group may, for example, include a second quarter-wave plate and a second lens. The third element group may, for example, include a third lens. The fourth element group may, for example, include a fourth lens. An air gap may exist between adjacent element groups from the first to the fourth element groups. In one example, the first element group may have positive optical power. The second element group may have negative optical power. The third element group may have positive optical power. The fourth element group may have positive optical power.

[0054] In an exemplary embodiment, the first side may be the human eye side, and the second side may be the display side. Accordingly, the first side of each element (first lens, second lens, third lens, fourth lens, reflective polarizing element, first quarter-wave plate, second quarter-wave plate) may be referred to as the side near the human eye, and the second side may be referred to as the side near the display.

[0055] In an exemplary embodiment, the first side surface of the first lens is configured as a plane, and a reflective polarizing element is bonded to a first quarter-wave plate to form a film layer. The bonded film layer is attached to the first side surface of the first lens, wherein the reflective polarizing element is located on the first side surface of the first quarter-wave plate. By combining the reflective polarizing element and the first quarter-wave plate to form a film layer, the number of bonding surfaces of the film layer can be reduced, improving the bonding yield of the film layer. Furthermore, the bonded film layer is attached to a plane, which helps to improve the stability of the film layer after bonding, thereby improving the performance of the visual optical system.

[0056] In an exemplary embodiment, the visual optical system may further include a partially reflective layer, which may, for example, be attached to a second side surface of the first lens. The partially reflective layer has a semi-transmissive and semi-reflective effect on light. By providing a partially reflective layer on the second side surface of the first lens, and combining it with a reflective polarizing element and a first quarter-wave plate on the first side surface of the first lens, light can be refracted multiple times, effectively reducing the overall length of the visual optical system.

[0057] In an exemplary embodiment, the visual optical system may further include an aperture stop, which may be disposed, for example, between the first side and the first lens. The image light on the display is finally projected to the user's eyes after being refracted and reflected multiple times by a fourth lens, a third lens, a second lens, a second quarter-wave plate, a first lens, a first quarter-wave plate, and a reflective polarizing element.

[0058] In an exemplary embodiment, a fifth element group may be disposed on the image surface. This fifth element group may include, for example, a display and a third quarter-wave plate, wherein the second side of the third quarter-wave plate is attached to the display. Image light from the display sequentially passes through a fourth lens, a third lens, a second lens, a second quarter-wave plate, a first lens, and a first quarter-wave plate, reaching a reflective polarizing element, where it is reflected to form first reflected image light. The first reflected image light passes through the first quarter-wave plate and the first lens, reaching a partial reflective layer, where it is reflected to form second reflected image light. The second reflected image light sequentially passes through the first lens, the first quarter-wave plate, and the reflective polarizing element to the aperture stop and is finally projected into the user's eye. The visual optical system provided in this application folds the required optical path without affecting projection quality by combining light reflection and refraction, effectively shortening the overall length of the visual optical system.

[0059] In an exemplary embodiment, the positioning optical system may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence from the object side to the image side along the second optical axis. There may be an air gap between two adjacent lenses among the first lens to the fifth lens. In one example, the first lens may have a negative optical power. The second lens may have a negative optical power. The third lens may have a positive optical power. The fourth lens may have a positive or negative optical power. The fifth lens may have a positive or negative optical power. By configuring the positioning optical system into a structure of five lenses, it is possible to enable the positioning optical system to have a relatively small total effective focal length on the basis of having a certain effective image plane, thereby ensuring that the positioning optical system has a relatively large field angle, which is convenient for helping the positioning optical system to capture the position and orientation of the handle in the user's hand.

[0060] In an exemplary embodiment, the total effective focal length f' of the visual optical system, the curvature radius R2' of the second side of the first lens, and the curvature radius R8' of the second side of the fourth lens may satisfy: 1.0 mm < f' / (R2' / R8') < 5.0 mm; and the total effective focal length f of the positioning optical system, the curvature radius R2 of the image side of the first lens, and the curvature radius R10 of the image side of the fifth lens may satisfy: -6.0 mm < f / (R2 / R10) < -1.0 mm. By constraining the focal lengths and corresponding relevant curvature radii of the lenses relatively closest to the first side and the second side in the visual optical system, and the focal lengths and corresponding relevant curvature radii of the lenses relatively closest to the object side and the image side in the positioning optical system, it is beneficial to improve the aberrations of the visual optical system and the positioning optical system and enhance the performance of the virtual reality system. At the same time, the virtual immersion feeling of the visual optical system is combined with the positioning function of the positioning optical system, breaking through the space limitation of the virtual reality system and realizing the interaction between the real world and the virtual world of the virtual optical system.

[0061] In an exemplary embodiment, the total effective focal length f' of the visual optical system, the maximum field angle FOV' of the visual optical system, the total effective focal length f of the positioning optical system, and the maximum field angle FOV of the positioning optical system may satisfy: 0.5 < (f'×tan(FOV' / 2)) / (f×tan(FOV / 2)) < 2.5. For a virtual reality system, the handle information collected by the chip of the positioning optical system will be transmitted to the display of the visual optical system, and then enter the user's eyes through the visual optical system. By controlling the above conditional expression, it is possible to constrain the display size of the visual optical system and the chip size of the positioning optical system, which is beneficial to the image transmission between the positioning optical system and the visual optical system.

[0062] In an exemplary embodiment, the entrance pupil diameter EPD' of the visual optical system and the entrance pupil diameter EPD of the positioning optical system may satisfy: 6.5 < EPD' / EPD < 8.0. The entrance pupil diameter of the visual optical system needs to match the pupil diameter of the user's eye, and the entrance pupil diameter of the positioning optical system is used to increase the incident amount of ambient light. By constraining the ratio of the entrance pupil diameters of the visual optical system and the positioning optical system within a reasonable range, it is possible to ensure that the light entering the chip and the user's eye is appropriate enough, thereby ensuring the comfort of the user's eye imaging and the clarity of the chip imaging.

[0063] In an exemplary embodiment, the on-axis distance TD' from the first side surface of the first lens to the second side surface of the fourth lens and the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the positioning optical system may satisfy: 1.3 < TD' / TTL < 1.8. By controlling the above conditional expression, it is possible to ensure the miniaturization of the visual optical system and the positioning optical system and the rationalization of the focal length, which is beneficial to shortening the lengths of the visual optical system and the positioning optical system and ensuring the miniaturization and thinness of the virtual reality system.

[0064] In an exemplary embodiment, the total effective focal length f' of the visual optical system and the total effective focal length f of the positioning optical system may satisfy: 9.0 < f' / f < 13.0. The positioning optical system is an imaging system, which needs to have a smaller image plane and a larger field angle to receive ambient light in order to better locate the position of the handle in the user's hand. By constraining the ratio of the total effective focal lengths of the visual optical system and the positioning optical system within a certain range, it is possible to make the positioning optical system have a smaller focal length, indirectly ensuring that the positioning optical system has a smaller image plane and a larger field angle to better locate the position of the handle in the user's hand, which helps to improve the performance combination of the visual optical system and the positioning optical system.

[0065] In an exemplary embodiment, the sum ∑CT' of the central thicknesses of each lens of the first lens to the fourth lens on the first optical axis and the sum ∑CT of the central thicknesses of each lens of the first lens to the fifth lens on the second optical axis may satisfy: 3.0 < ∑CT' / ∑CT < 5. _. By controlling the above conditional expression, it is possible to make the structures of the visual optical system and the positioning optical system compact, which helps to achieve the miniaturization of the entire virtual reality system. At the same time, it can also reduce the length of the virtual reality system to meet the requirements of thinness.

[0066] In an exemplary embodiment, the effective focal length f3' of the third element group, the effective focal length f4' of the fourth element group, the refractive index N3' of the third lens, the refractive index N4' of the fourth lens, the central thickness CT3' of the third lens on the first optical axis, and the central thickness CT4' of the fourth lens on the first optical axis may satisfy: -2.0 < (f3' + f4') × (N3' - N4') / (CT3' + CT4') < 0. By controlling the above conditional formula, the effective focal lengths of the third element group and the fourth element group can be within a certain range, ensuring the reasonable incidence of large-angle light rays, effectively reducing the aberration of the visual optical system, and improving the imaging quality of the visual optical system; at the same time, it can also constrain the refractive indices and central thicknesses of the third lens and the fourth lens, which is beneficial to adjusting the chromatic aberration and off-axis aberration of the visual optical system, and thus ensuring that the visual optical system has a good imaging effect.

[0067] In an exemplary embodiment, the effective focal length f1' of the first element group, the refractive index N1' of the first lens, the refractive index NR of the reflective polarizing element, and the refractive index NQ1 of the first quarter-wave plate may satisfy: 10.0 mm < f1' / (NR + NQ1) + f1' / N1' < 15.0 mm. By controlling the above conditional formula, the optical power and the refractive index can be in a certain proportion, which is convenient for better constraining the effective focal length of the first element group by using the refractive index.

[0068] In an exemplary embodiment, the effective focal length f3' of the third element group, the effective focal length f4' of the fourth element group, the curvature radius R6' of the second side of the third lens, and the curvature radius R8' of the second side of the fourth lens may satisfy: -1.0 < f3' / R6' - f4' / R8' < 0. By controlling the above conditional formula, the ratio of the effective focal length of the third element group to the curvature radius of the second side of the third lens and the ratio of the effective focal length of the fourth element group to the curvature radius of the second side of the fourth lens can be constrained within a certain range, which is beneficial to reducing the sensitivity of the third lens and the fourth lens, and thus reducing the processing difficulty of the third lens and the fourth lens.

[0069] In an exemplary embodiment, the effective focal length f2' of the second element group, the effective focal length f3' of the third element group, and the total effective focal length f' of the visual optical system may satisfy: -15. < (f2' + f3') / f' < -8.0. By controlling the above conditional formula, the optical power of the visual optical system can be reasonably distributed, ensuring that the second element group and the third element group have good light bending capabilities.

[0070] In an exemplary embodiment, the air gap T23' between the second element group and the third element group on the first optical axis, the air gap T34' between the third element group and the fourth element group on the first optical axis, the dispersion coefficient V2' of the second lens, the dispersion coefficient VQ2 of the second quarter-wave plate, the dispersion coefficient V3' of the third lens, and the dispersion coefficient V4' of the fourth lens may satisfy: 1.0 mm < T23'×(V2'+VQ2) - T34'×(V3'+V4') < 2.0 mm. By controlling the above conditional expression, the dispersion coefficient of the visual optical system can be reasonably distributed, which is beneficial to improving the chromatic aberration of the visual optical system; at the same time, the air gap between the second element group and the third element group on the first optical axis and the air gap between the third element group and the fourth element group on the first optical axis can be constrained, which is beneficial to reducing the sensitivity of the visual optical system and improving the performance yield of the visual optical system.

[0071] In an exemplary embodiment, the total effective focal length f' of the visual optical system, the central thickness CT4' of the fourth lens on the first optical axis, and the air gap T4Q between the fourth element group and the fifth element group on the first optical axis may satisfy: -3.0 < f' / (CT4'+T4Q) < 7.0. By constraining the ratio of the total effective focal length of the visual optical system to the total thickness of the fourth lens and its air gap within a certain range, good processability of the fourth lens can be ensured, and a reasonable total optical length of the visual optical system can be ensured, which is beneficial to realizing miniaturization of the visual optical system.

[0072] In an exemplary embodiment, the total effective focal length f of the positioning optical system and the effective focal length f1 of the first lens may satisfy: -0.5 < f / f1 < 0. By constraining the ratio of the total effective focal length of the positioning optical system to the effective focal length of the first lens within a certain range, the optical power of the positioning optical system can be reasonably distributed, good light bending ability of the first lens can be ensured, and the imaging quality of large-angle light can be ensured.

[0073] In an exemplary embodiment, the total effective focal length f of the positioning optical system, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens may satisfy: 0 < f / (R1 - R2) < 0.5. By controlling the above conditional expression, the curvature radii of the object side surface and the image side surface of the first lens can be constrained within a certain range, which is beneficial to reducing the surface sensitivity of the first lens and the processing difficulty of the first lens.

[0074] In an exemplary embodiment, the effective focal length f3 of the third lens, the combined focal length f45 of the fourth and fifth lenses, the air gap T34 between the third and fourth lenses on the second optical axis, the dispersion coefficient V3 of the third lens, the dispersion coefficient V4 of the fourth lens, and the dispersion coefficient V5 of the fifth lens can satisfy: 0 < (f3 + f45) / (T34 × (V3 + V4 + V5)) < 4.0. By controlling the above conditional expression, the dispersion coefficients of the third, fourth, and fifth lenses can be reasonably allocated, which is beneficial for optimizing the chromatic aberration of the positioning optical system; at the same time, the effective focal length of the third lens and the combined focal length of the fourth and fifth lenses can be constrained, and the focal length of the positioning optical system can be reasonably allocated to ensure that the light has a relatively smooth incident path, thereby improving the imaging quality of the positioning optical system.

[0075] In an exemplary embodiment, the center thickness CT2 of the second lens on the second optical axis, the air gap T23 between the second and third lenses on the second optical axis, the effective focal length f2 of the second lens, and the radius of curvature R3 and R4 of the object side and image side of the second lens can satisfy: -3.0mm < (CT2 + T23) × f2 / |(R3 + R4)| < 0mm. By controlling the above conditional expression, the ratio of the total thickness of the second lens and its air gap to the sum of the radii of curvature on both sides of the second lens can be constrained within a reasonable range. This is beneficial for controlling the sensitivity of the second and third lenses and the total optical length of the positioning optical system, thereby ensuring that the positioning optical system can be miniaturized while maintaining good manufacturability.

[0076] In an exemplary embodiment, the center thickness CT4 of the fourth lens on the second optical axis, the effective focal length f4 of the fourth lens, the refractive index N4 of the fourth lens, the center thickness CT5 of the fifth lens on the second optical axis, the effective focal length f5 of the fifth lens, the refractive index N5 of the fifth lens, and the combined focal length f45 of the fourth and fifth lenses can satisfy: (CT4+CT5) / |(f4+f5)×N4+f45×N5|<1.5. By controlling the above conditional expression, the effective focal lengths of the fourth and fifth lenses can be kept within a certain range, ensuring reasonable incidence of large-angle light rays, effectively reducing aberrations in the positioning optical system, and improving the imaging quality of the positioning optical system; at the same time, it can also constrain the refractive index and center thickness of the fourth and fifth lenses, which is beneficial for adjusting the chromatic aberration and off-axis aberrations of the positioning optical system, thereby ensuring that the positioning optical system has a good imaging effect.

[0077] In an exemplary embodiment, the central thickness CT3 of the third lens on the second optical axis, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens may satisfy: CT3 / |R5 - R6| < 1.0. By controlling the above conditional expression, the central thickness of the third lens on the second optical axis can be constrained within a certain range, thereby ensuring that the third lens has good machinability and aberration correction ability; at the same time, the surface profiles of the object side surface and the image side surface of the third lens can also be constrained to ensure the uniformity and machinability of the third lens.

[0078] In an exemplary embodiment, the maximum field of view FOV of the positioning optical system may satisfy: FOV > 165.0°. By making the maximum field of view of the positioning optical system greater than 165.0°, it can be ensured that the environmental field of view collected by the positioning optical system is large enough, and further ensure that the positioning optical system can detect the handle in the user's hand to the maximum extent, so as to give the user sufficient feedback.

[0079] In an exemplary embodiment, the total effective focal length f of the positioning optical system, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens may satisfy: -0.5 < f / f2 + f / f3 < 0.5. By controlling the above conditional expression, the effective focal lengths of the second lens and the third lens can be constrained within a certain range, thereby reasonably balancing the light bending ability of the second lens and the third lens.

[0080] The virtual reality system according to the above embodiment of the present application is composed of a visual optical system and a positioning optical system. Among them, the visual optical system can adopt multiple lenses, such as the four lenses described above, and the positioning optical system can adopt multiple lenses, such as the five lenses described above. By reasonably configuring the parameters of the visual optical system and the positioning optical system, the virtual immersion of the visual optical system can be combined with the positioning function of the positioning optical system, breaking through the space limitation of the virtual reality system, and realizing the interaction between the real world and the virtual world of the virtual optical system. The virtual reality system configured as above has the characteristics of miniaturization, low sensitivity, and good imaging quality, and can well meet the use requirements of various portable electronic products in the projection scenario.

[0081] In an embodiment of the present application, at least one of the surfaces of each of the first lens to the fourth lens is an aspherical surface. At least one of the surfaces of each of the first lens to the fifth lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better radius of curvature characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, and thus improve the imaging quality.

[0082] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the visual optical system and / or the number of lenses in the positioning optical system can be changed to obtain the various results and advantages described in this specification.

[0083] refer to Figure 1 A second aspect of this application provides a virtual reality system that may include a visual optical system and a positioning optical system. The visual optical system, along a first optical axis from a first side to a second side, sequentially includes a first element group, a second element group, a third element group, and a fourth element group. The first element group includes a reflective polarizing element, a first quarter-wave plate, and a first lens with positive optical power. The second element group includes a second quarter-wave plate and a second lens. The third element group includes a third lens. The fourth element group includes a fourth lens with positive optical power. The positioning optical system, along a second optical axis from the object side to the image side, sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has negative optical power, and the fifth lens has either positive or negative optical power.

[0084] The total effective focal length f' of the visual optical system, the maximum field of view (FOV) of the visual optical system, and the total effective focal length f and maximum field of view (FOV) of the positioning optical system can satisfy the following condition: 0.5 < (f' × tan(FOV' / 2)) / (f × tan(FOV / 2)) < 2.5. For a virtual reality system, the controller information collected by the chip in the positioning optical system is transmitted to the display of the visual optical system, and then enters the user's eyes through the visual optical system. By controlling the above conditional expressions, the display size of the visual optical system and the chip size of the positioning optical system can be constrained, which is beneficial for image transmission between the positioning optical system and the visual optical system.

[0085] refer to Figure 1 A third aspect of this application provides a virtual reality system that may include a visual optical system and a positioning optical system. The visual optical system, along a first optical axis from a first side to a second side, sequentially includes a first element group, a second element group, a third element group, and a fourth element group. The first element group includes a reflective polarizing element, a first quarter-wave plate, and a first lens with positive optical power. The second element group includes a second quarter-wave plate and a second lens. The third element group includes a third lens. The fourth element group includes a fourth lens with positive optical power. The positioning optical system, along a second optical axis from the object side to the image side, sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has negative optical power, and the fifth lens has either positive or negative optical power.

[0086] Among them, the on-axis distance TD' from the first side surface of the first lens to the second side surface of the fourth lens and the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the positioning optical system can satisfy: 1.3 < TD' / TTL < 1.8. By controlling the above conditional formula, miniaturization of the visual optical system and the positioning optical system and rationalization of the focal length can be ensured, which is beneficial to shortening the lengths of the visual optical system and the positioning optical system and ensuring miniaturization and thinness of the virtual reality system.

[0087] The following further describes specific embodiments of the visual optical system applicable to the above embodiments with reference to the accompanying drawings.

[0088] Example 1

[0089] The following refers to <00​​​​​​​​The first lens E1' has positive optical power. Its side near the human eye (S3) is flat, and its side near the display (S4) is convex, with a partial reflective layer (BS) attached. The reflective polarizing element RP has a side near the human eye (S1) and a side near the display. The first quarter-wave plate QWP1 has a side near the human eye (S2) and a side near the display. The side near the display of the reflective polarizing element RP is attached to the side near the human eye (S2) of the first quarter-wave plate QWP1, and the side near the display of the first quarter-wave plate QWP1 is attached to the side near the human eye (S3) of the first lens E1'. The second lens E2' has negative optical power. Its side near the human eye (S6) is flat, and its side near the display (S7) is concave. The second quarter-wave plate QWP2 has a side near the human eye (S5) and a side near the display. Its side near the display is attached to the side near the human eye (S6) of the second lens E2. The third lens E3' has positive optical power. Its side near the human eye (S8) is convex, and its side near the display (S9) is convex. The fourth lens E4' has positive optical power, and its side S10 near the human eye is convex, while its side S11 near the display screen is convex.

[0092] In this example, the second side of the visual optical system 100 may be provided with an image surface S14. The image surface S14 may, for example, be provided with a fifth element group. The fifth element group may include a display and a third quarter-wave plate QWP3. The third quarter-wave plate QWP3 has a near-eye side S12 and a near-display side, with its near-display side attached to the near-eye side S13 of the display. Image light from the display passes sequentially through the fourth lens E4', the third lens E3', the second lens E2', the second quarter-wave plate QWP2, the first lens E1', and the first quarter-wave plate QWP1, and reaches the reflective polarizing element RP, where it undergoes a first reflection. The light after the first reflection passes through the first quarter-wave plate QWP1 and the first lens E1', and reaches the partial reflective layer BS, where it undergoes a second reflection. The light after the second reflection passes sequentially through the first lens E1', the first quarter-wave plate QWP1, and the reflective polarizing element RP, and is finally projected onto a target object (not shown) in space. For example, the light from the visual optics system 100, after being reflected twice, is finally projected into the user's eyes.

[0093] Table 1 shows the basic parameters of the visual optical system of Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm). Image light from the display passes through each element in the order of number 20 to number 2 and is finally projected into the human eye.

[0094]

[0095] Table 1

[0096] In this embodiment, the effective focal length f1' of the first element group is 12.85mm, the effective focal length f2' of the second element group is -189.57mm, the effective focal length f3' of the third element group is 69.02mm, the effective focal length f4' of the fourth element group is 13.72mm, the total effective focal length f' of the visual optical system is 11.42mm, the maximum field of view FOV' of the visual optical system is 86.0°, and the entrance pupil diameter EPD' of the visual optical system is 4.00mm.

[0097] In this embodiment, the near-display side S4 of the first lens E1', the near-display side S7 of the second lens E2', the near-eye side S8 and the near-display side S9 of the third lens E3', and the near-eye side S10 and the near-display side S11 of the fourth lens E4' are all aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0098]

[0099] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R' (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R' in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 gives the higher-order coefficients A4, A6, A8, A11 that can be used for the aspherical surfaces S4, S7-S11 in Example 1. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0100] Face number A4 A6 A8 A10 A12 A14 A16 S4 3.0304E-01 -1.0621E-02 -1.5620E-02 -2.9141E-03 1.8351E-03 -1.7256E-03 -1.3851E-03 S7 3.4370E+00 -2.0879E+00 6.1986E-01 -1.2996E-01 4.7722E-02 -1.3799E-01 2.1508E-02 S8 5.6441E+00 -1.8365E+00 4.4098E-01 -2.4040E-01 8.0767E-02 -3.1782E-02 1.6182E-02 S9 1.3125E+00 2.4808E-01 -1.3023E-01 -4.4012E-02 -1.8530E-01 1.8700E-01 -4.0088E-02 S10 -2.7743E+00 3.8238E-01 -1.5139E-01 1.1100E-02 -1.1473E-01 4.0203E-02 -9.7778E-02 S11 6.7587E+00 -8.7685E-01 6.0414E-01 -6.1853E-01 1.3915E-01 -1.8766E-01 1.4235E-01 Face number A18 A20 A22 A24 A26 A28 A30 S4 4.3641E-04 6.6450E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 2.8761E-02 1.5321E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 1.0433E-02 3.2935E-03 2.9966E-03 2.5699E-04 4.8557E-06 -2.0894E-03 4.4491E-05 S9 6.4052E-02 -7.1864E-02 4.4520E-02 -5.8763E-02 5.6555E-03 2.3802E-02 1.9227E-02 S10 1.2092E-01 1.1287E-01 1.2005E-01 -8.0753E-02 -1.3912E-02 1.0475E-01 5.7259E-02 S11 -1.0204E-02 1.7101E-01 1.8396E-02 -6.9916E-02 -7.8251E-02 8.2677E-02 2.0508E-02

[0101] Table 2

[0102] Figure 4A The on-axis chromatic aberration curve of the visual optical system of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the visual optical system. Figure 4B The astigmatism curves of the visual optical system of Embodiment 1 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view angles. Figure 4C The distortion curves of the visual optical system of Embodiment 1 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 4A to 4CAs can be seen, the visual optical system given in Example 1 can achieve good imaging quality.

[0103] Example 2

[0104] The following is for reference Figures 5 to 6C A visual optical system according to Embodiment 2 of this application is described.

[0105] like Figure 5 As shown, the visual optical system 100 includes a first element group, a second element group, a third element group, and a fourth element group arranged sequentially along a first optical axis from a first side to a second side. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. In other examples, the first element group also includes a partial reflective layer BS (not shown). The second element group includes a second quarter-wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. In this embodiment, the first side refers to the human eye side, and the second side refers to the display side. The first side of each element (first lens E1', second lens E2', third lens E3', fourth lens E4', reflective polarizing element RP, first quarter-wave plate QWP1, and second quarter-wave plate QWP2) is referred to as the near-human eye side, and the second side is referred to as the near-display side.

[0106] The first lens E1' has positive optical power. Its side near the human eye (S3) is flat, and its side near the display (S4) is convex, with a partial reflective layer (BS) attached. The reflective polarizing element RP has a side near the human eye (S1) and a side near the display. The first quarter-wave plate QWP1 has a side near the human eye (S2) and a side near the display. The side near the display of the reflective polarizing element RP is attached to the side near the human eye (S2) of the first quarter-wave plate QWP1, and the side near the display of the first quarter-wave plate QWP1 is attached to the side near the human eye (S3) of the first lens E1'. The second lens E2' has negative optical power. Its side near the human eye (S6) is flat, and its side near the display (S7) is concave. The second quarter-wave plate QWP2 has a side near the human eye (S5) and a side near the display. Its side near the display is attached to the side near the human eye (S6) of the second lens E2. The third lens E3' has positive optical power. Its side near the human eye (S8) is convex, and its side near the display (S9) is convex. The fourth lens E4' has positive optical power, and its side S10 near the human eye is convex, while its side S11 near the display screen is convex.

[0107] In this example, the second side of the visual optical system 100 may be provided with an image surface S14. The image surface S14 may, for example, be provided with a fifth element group. The fifth element group may include a display and a third quarter-wave plate QWP3. The third quarter-wave plate QWP3 has a near-eye side S12 and a near-display side, with its near-display side attached to the near-eye side S13 of the display. Image light from the display passes sequentially through the fourth lens E4', the third lens E3', the second lens E2', the second quarter-wave plate QWP2, the first lens E1', and the first quarter-wave plate QWP1, and reaches the reflective polarizing element RP, where it undergoes a first reflection. The light after the first reflection passes through the first quarter-wave plate QWP1 and the first lens E1', and reaches the partial reflective layer BS, where it undergoes a second reflection. The light after the second reflection passes sequentially through the first lens E1', the first quarter-wave plate QWP1, and the reflective polarizing element RP, and is finally projected onto a target object (not shown) in space. For example, the light from the visual optics system 100, after being reflected twice, is finally projected into the user's eyes.

[0108] Table 3 shows the basic parameters of the visual optical system in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm). The image light from the display passes through each element in the order of number 20 to number 2 and is finally projected into the human eye.

[0109]

[0110]

[0111] Table 3

[0112] In this embodiment, the effective focal length f1' of the first element group is 12.20 mm, the effective focal length f2' of the second element group is -192.23 mm, the effective focal length f3' of the third element group is 43.35 mm, the effective focal length f4' of the fourth element group is 17.10 mm, the total effective focal length f' of the visual optical system is 11.17 mm, the maximum field of view FOV' of the visual optical system is 110.0°, and the entrance pupil diameter EPD' of the visual optical system is 4.00 mm.

[0113] In this embodiment, the near-display side S4 of the first lens E1', the near-display side S7 of the second lens E2', the near-eye side S8 and near-display side S9 of the third lens E3', and the near-eye side S10 and near-display side S11 of the fourth lens E4' are all aspherical surfaces. Table 4 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical surface S4, S7-S11 in Embodiment 2. 10 A12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0114] Face number A4 A6 A8 A10 A12 A14 A16 S4 3.1882E-01 2.9495E-02 -1.9117E-02 -1.1550E-02 4.1874E-03 3.8985E-03 -3.3243E-04 S7 1.4100E+00 -1.9986E+00 6.7103E-01 7.3616E-02 3.1140E-03 -9.6734E-02 1.5312E-02 S8 4.4337E+00 -1.8176E+00 5.7614E-01 -4.4475E-02 7.8548E-02 -7.4049E-02 -1.1694E-02 S9 9.9238E-01 4.8636E-01 -1.4997E-01 -1.8562E-02 -2.0599E-01 1.4785E-01 -1.8057E-02 S10 -1.7480E+00 1.2100E+00 -2.0084E-01 1.0242E-01 -8.6209E-02 1.2503E-01 -1.3283E-01 S11 5.4132E+00 -4.5173E-01 4.2508E-01 -6.1469E-01 2.0191E-01 -4.8640E-02 1.0452E-01 Face number A18 A20 A22 A24 A26 A28 A30 S4 -1.6707E-03 4.8624E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 2.0422E-02 -2.9870E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 9.6569E-04 -8.4916E-03 3.3190E-02 1.4301E-02 -7.6753E-03 -3.8826E-03 -1.7833E-03 S9 5.8541E-02 -3.2976E-02 7.7980E-02 -8.8075E-02 -5.4823E-03 2.6202E-02 -4.9560E-03 S10 4.9806E-02 2.9684E-02 7.2041E-02 -1.1503E-01 -3.9545E-02 5.1402E-02 6.2338E-03 S11 -1.3164E-01 4.4188E-02 3.8235E-02 1.7552E-02 -6.0568E-02 2.2615E-02 9.2040E-04

[0115] Table 4

[0116] Figure 6A The on-axis chromatic aberration curve of the visual optical system of Embodiment 2 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the visual optical system. Figure 6B The astigmatism curves of the visual optical system of Embodiment 2 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view angles. Figure 6C The distortion curves of the visual optical system in Embodiment 2 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 6A to 6C It can be seen that the visual optical system given in Example 2 can achieve good imaging quality.

[0117] Example 3

[0118] The following is for reference Figures 7 to 8C A visual optical system according to Embodiment 3 of this application is described.

[0119] like Figure 7 As shown, the visual optical system 100 includes a first element group, a second element group, a third element group, and a fourth element group arranged sequentially along a first optical axis from a first side to a second side. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. In other examples, the first element group also includes a partial reflective layer BS (not shown). The second element group includes a second quarter-wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. In this embodiment, the first side refers to the human eye side, and the second side refers to the display side. The first side of each element (first lens E1', second lens E2', third lens E3', fourth lens E4', reflective polarizing element RP, first quarter-wave plate QWP1, and second quarter-wave plate QWP2) is referred to as the near-human eye side, and the second side is referred to as the near-display side.

[0120] The first lens E1' has positive optical power. Its side near the human eye (S3) is flat, and its side near the display (S4) is convex and has a partially reflective layer (BS) attached to it. The reflective polarizing element RP has a side near the human eye (S1) and a side near the display. The first quarter-wave plate QWP1 has a side near the human eye (S2) and a side near the display. The side near the display of the reflective polarizing element RP is attached to the side near the human eye (S2) of the first quarter-wave plate QWP1, and the side near the display of the first quarter-wave plate QWP1 is attached to the side near the human eye (S3) of the first lens E1'. The second lens E2' has negative optical power. Its side near the human eye (S6) is flat, and its side near the display (S7) is concave. The second quarter-wave plate QWP2 has a side near the human eye (S5) and a side near the display. Its side near the display is attached to the side near the human eye (S6) of the second lens E2. The third lens E3' has positive optical power. Its side near the human eye (S8) is concave, and its side near the display (S9) is convex. The fourth lens E4' has positive optical power, with its side S10 near the human eye being concave and its side S11 near the display screen being convex.

[0121] In this example, the second side of the visual optical system 100 may be provided with an image surface S14. The image surface S14 may, for example, be provided with a fifth element group. The fifth element group may include a display and a third quarter-wave plate QWP3. The third quarter-wave plate QWP3 has a near-eye side S12 and a near-display side, with its near-display side attached to the near-eye side S13 of the display. Image light from the display passes sequentially through the fourth lens E4', the third lens E3', the second lens E2', the second quarter-wave plate QWP2, the first lens E1', and the first quarter-wave plate QWP1, and reaches the reflective polarizing element RP, where it undergoes a first reflection. The light after the first reflection passes through the first quarter-wave plate QWP1 and the first lens E1', and reaches the partial reflective layer BS, where it undergoes a second reflection. The light after the second reflection passes sequentially through the first lens E1', the first quarter-wave plate QWP1, and the reflective polarizing element RP, and is finally projected onto a target object (not shown) in space. For example, the light from the visual optics system 100, after being reflected twice, is finally projected into the user's eyes.

[0122] Table 5 shows the basic parameters of the visual optical system in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm). Image light from the display passes through each element in the order of number 20 to number 2 and is finally projected into the human eye.

[0123]

[0124]

[0125] Table 5

[0126] In this embodiment, the effective focal length f1' of the first element group is 12.15mm, the effective focal length f2' of the second element group is -192.12mm, the effective focal length f3' of the third element group is 35.44mm, the effective focal length f4' of the fourth element group is 19.62mm, the total effective focal length f' of the visual optical system is 11.25mm, the maximum field of view FOV' of the visual optical system is 110.0°, and the entrance pupil diameter EPD' of the visual optical system is 4.00mm.

[0127] In this embodiment, the near-display side S4 of the first lens E1', the near-display side S7 of the second lens E2', the near-eye side S8 and near-display side S9 of the third lens E3', and the near-eye side S10 and near-display side S11 of the fourth lens E4' are all aspherical surfaces. Table 6 lists the higher-order coefficients A4, A6, A8, and A11 that can be used for each aspherical surface S4, S7-S11 in Embodiment 3. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0128]

[0129] Table 6

[0130] Figure 8A The on-axis chromatic aberration curve of the visual optical system of Embodiment 3 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the visual optical system. Figure 8B The astigmatism curves of the visual optical system of Embodiment 3 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view angles. Figure 8C The distortion curves of the visual optical system of Embodiment 3 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 8A to 8C As can be seen, the visual optical system given in Example 3 can achieve good imaging quality.

[0131] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the positioning optical system applicable to the above-described embodiments.

[0132] Example 4

[0133] The following is for reference Figures 9 to 10C A positioning optical system according to Embodiment 4 of this application is described.

[0134] like Figure 9 As shown, the positioning optical system 200 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the second optical axis from the object side to the image side. An aperture stop STO may be positioned between the third lens E3 and the fourth lens E4.

[0135] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface being concave and its image-side surface S9 being convex. The filter E6 has an object-side surface S10 and an image-side surface S11. Light from the object passes sequentially through surfaces S1 to S11 and is finally imaged onto the imaging surface S12. The fourth lens E4 can be cemented with the fifth lens E5 to form a cemented lens.

[0136] Table 7 shows the basic parameters of the positioning optical system in Example 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0137]

[0138] Table 7

[0139] In this embodiment, the total effective focal length f of the positioning optical system is 0.94 mm, half the diagonal length of the effective pixel area on the imaging plane of the positioning optical system (ImgH) is 1.39 mm, the maximum field of view (FOV) of the positioning optical system is 166.52°, the on-axis distance TTL from the object side of the first lens to the imaging plane is 8.72 mm, the aperture number Fno of the positioning optical system is 1.80, and the combined focal length f45 of the fourth and fifth lenses is 2.26 mm.

[0140] In this embodiment, the object-side surface and image-side surface of any one of the second lens E2 to the fifth lens E5 are aspherical, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0141]

[0142] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 8 shows the higher-order coefficients A4, A6, A8, and A9 that can be used for the aspherical surfaces S3-S9 in Example 4. 10 A 12 A 14 and A 16 .

[0143] Face number A4 A6 A8 A10 A12 A14 A16 S3 8.1709E-03 -1.6699E-03 1.1417E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 4.0480E-02 -9.9417E-03 3.6317E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 4.6145E-02 -8.1770E-02 6.2700E-01 -1.6554E+00 2.4666E+00 -1.8555E+00 5.7412E-01 S6 5.4557E-02 -5.8947E-02 4.1420E-01 -5.4961E-01 1.7032E-01 4.0424E-01 -9.6655E-02 S7 2.5690E-02 -1.4889E-01 8.4115E-01 -2.3518E+00 3.6858E+00 -3.0361E+00 1.0285E+00 S8 -8.7840E-01 1.7243E+00 -1.7089E+00 2.9427E+00 -3.1734E+00 1.3554E+00 7.5486E-02 S9 -4.4601E-02 2.2411E-01 -1.0263E-01 2.1009E-01 -4.7776E-01 4.9715E-01 -1.7708E-01

[0144] Table 8

[0145] Figure 10A The on-axis chromatic aberration curve of the positioning optical system of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the positioning optical system. Figure 10B The astigmatism curves of the positioning optical system of Embodiment 4 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view angles. Figure 10C The distortion curves of the positioning optical system in Embodiment 4 are shown, representing the distortion magnitudes corresponding to different field of view angles. According to... Figures 10A to 10C As can be seen, the positioning optical system given in Example 4 can achieve good imaging quality.

[0146] Example 5

[0147] The following is for reference Figures 11 to 12C A positioning optical system according to Embodiment 5 of this application is described.

[0148] like Figure 11 As shown, the positioning optical system 200 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the second optical axis from the object side to the image side. An aperture stop STO may be positioned between the third lens E3 and the fourth lens E4.

[0149] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface being convex and its image-side surface S9 being convex. The filter E6 has an object-side surface S10 and an image-side surface S11. Light from the object passes sequentially through surfaces S1 to S11 and is finally imaged onto the imaging surface S12. The fourth lens E4 can be cemented with the fifth lens E5 to form a cemented lens.

[0150] Table 9 shows the basic parameters of the positioning optical system in Example 5, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0151]

[0152] Table 9

[0153] In this embodiment, the total effective focal length f of the positioning optical system is 1.02 mm, half the diagonal length of the effective pixel area ImgH on the imaging plane of the positioning optical system is 1.46 mm, the maximum field of view FOV of the positioning optical system is 170.01°, the on-axis distance TTL from the object side of the first lens to the imaging plane is 8.80 mm, the aperture number Fno of the positioning optical system is 1.79, and the combined focal length f45 of the fourth and fifth lenses is 11.51 mm.

[0154] In this embodiment, the object-side surface and image-side surface of any one of the second lens E2 to the fifth lens E5 are aspherical. Table 10 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical surfaces S3-S9 in Embodiment 5. 10 .

[0155] Face number A4 A6 A8 A10 S3 2.2835E-02 -5.8975E-03 6.8097E-04 -4.5138E-05 S4 5.6351E-02 1.6723E-02 9.1635E-03 7.1419E-03 S5 -1.8230E-02 -8.2667E-03 0.0000E+00 0.0000E+00 S6 4.5017E-02 -2.6831E-02 1.8444E-02 -4.8286E-03 S7 8.7096E-02 -2.7514E-01 1.9508E-01 -8.8720E-02 S8 8.9480E-01 -1.2767E+00 7.7901E-01 -1.9428E-01 S9 -4.9922E-02 1.9019E-02 -1.6599E-02 6.0651E-03

[0156] Table 10

[0157] Figure 12A The on-axis chromatic aberration curve of the positioning optical system of Embodiment 5 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the positioning optical system. Figure 12B The astigmatism curves of the positioning optical system of Embodiment 5 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view angles. Figure 12C The distortion curves of the positioning optical system in Embodiment 5 are shown, representing the distortion magnitudes corresponding to different field of view angles. According to... Figures 12A to 12CAs can be seen, the positioning optical system given in Example 5 can achieve good imaging quality.

[0158] Example 6

[0159] The following is for reference Figures 13 to 14C A positioning optical system according to Embodiment Six of this application is described.

[0160] like Figure 13 As shown, the positioning optical system 200 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the second optical axis from the object side to the image side. An aperture stop STO may be positioned between the third lens E3 and the fourth lens E4.

[0161] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface being concave and its image-side surface S9 being convex. The filter E6 has an object-side surface S10 and an image-side surface S11. Light from the object passes sequentially through surfaces S1 to S11 and is finally imaged onto the imaging surface S12. The fourth lens E4 can be cemented with the fifth lens E5 to form a cemented lens.

[0162] Table 11 shows the basic parameters of the positioning optical system in Example 6, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0163]

[0164] Table 11

[0165] In this embodiment, the total effective focal length f of the positioning optical system is 1.07 mm, half the diagonal length of the effective pixel area on the imaging plane of the positioning optical system (ImgH) is 1.50 mm, the maximum field of view (FOV) of the positioning optical system is 166.51°, the on-axis distance TTL from the object side of the first lens to the imaging plane is 9.20 mm, the aperture number Fno of the positioning optical system is 1.79, and the combined focal length f45 of the fourth and fifth lenses is 2.14 mm.

[0166] In this embodiment, the object-side surface and image-side surface of any one of the second lens E2 to the fifth lens E5 are aspherical. Table 12 lists the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical surfaces S3-S9 in Embodiment Six. 10 A12 A 14 and A 16 .

[0167]

[0168]

[0169] Table 12

[0170] Figure 14A The on-axis chromatic aberration curve of the positioning optical system of Embodiment Six is ​​shown, which represents the deflection of the focal point after light of different wavelengths passes through the positioning optical system. Figure 14B The astigmatism curves of the positioning optical system of Embodiment Six are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view angles. Figure 14C The distortion curves of the positioning optical system in Embodiment Six are shown, representing the distortion magnitudes corresponding to different field of view angles. According to... Figures 14A to 14C As can be seen, the positioning optical system given in Example 6 can achieve good imaging quality.

[0171] Example 7

[0172] The following is for reference Figures 15 to 16C A positioning optical system according to Embodiment 7 of this application is described.

[0173] like Figure 15 As shown, the positioning optical system 200 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the second optical axis from the object side to the image side. An aperture stop STO may be positioned between the third lens E3 and the fourth lens E4.

[0174] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface being convex and its image-side surface S9 being convex. The filter E6 has an object-side surface S10 and an image-side surface S11. Light from the object passes sequentially through surfaces S1 to S11 and is finally imaged onto the imaging surface S12. The fourth lens E4 can be cemented with the fifth lens E5 to form a cemented lens.

[0175] Table 13 shows the basic parameters of the positioning optical system in Example 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0176]

[0177]

[0178] Table 13

[0179] In this embodiment, the total effective focal length f of the positioning optical system is 1.16 mm, half the diagonal length of the effective pixel area on the imaging plane of the positioning optical system (ImgH) is 1.44 mm, the maximum field of view (FOV) of the positioning optical system is 170.14°, the on-axis distance TTL from the object side of the first lens to the imaging plane is 8.54 mm, the aperture number Fno of the positioning optical system is 2.23, and the combined focal length f45 of the fourth and fifth lenses is 2.30 mm.

[0180] In this embodiment, the object-side surface and image-side surface of any one of the second lens E2 to the fifth lens E5 are aspherical. Table 14 lists the higher-order coefficients A4, A6, A8, and A9 that can be used for the aspherical surfaces S3-S9 in Embodiment 7. 10 A 12 A 14 and A 16 .

[0181] Face number A4 A6 A8 A10 A12 A14 A16 S3 -1.4988E-01 -3.4651E-01 4.2843E-01 -3.1818E-01 2.2939E-01 -1.2734E-01 2.7679E-02 S4 -2.3320E-01 -3.5119E-01 -1.5219E+00 8.9955E+00 -2.0106E+01 2.1715E+01 -9.2567E+00 S5 4.2405E-02 -1.3906E-01 1.4925E-01 -9.9117E-03 7.9512E-02 -1.1613E-01 6.5487E-02 S6 -7.9369E-02 -2.8792E-02 7.0347E-02 -6.5074E-02 8.0555E-14 -6.0224E-18 1.2971E-19 S7 -6.8316E-02 3.0303E-02 -8.3753E-02 7.2499E-02 -2.0747E-15 -7.5578E-18 -3.0084E-20 S8 4.1886E-01 -8.5807E-01 1.1506E+00 -1.2658E+00 -2.6034E-01 1.7275E+00 -1.1336E+00 S9 -8.4059E-03 4.7364E-02 -1.8098E-01 5.2189E-01 -8.5377E-01 7.4396E-01 -2.5384E-01

[0182] Table 14

[0183] Figure 16A The on-axis chromatic aberration curve of the positioning optical system of Embodiment 7 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the positioning optical system. Figure 16B The astigmatism curves of the positioning optical system of Embodiment 7 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view angles. Figure 16C The distortion curves of the positioning optical system in Embodiment 7 are shown, representing the distortion magnitudes corresponding to different field of view angles. According to... Figures 16A to 16C As can be seen, the positioning optical system given in Example 7 can achieve good imaging quality.

[0184] refer to Figure 1The virtual reality system 10 provided in this application can be composed of the visual optical system 100 in any of the above embodiments and the positioning optical system 200 in any of the above embodiments. The visual optical system and the positioning optical system can be combined in pairs to form 12 virtual reality systems, that is, there are 12 examples of virtual reality systems. Specifically, the virtual reality system corresponding to Example 1 is composed of the positioning optical system of Example 4 and the visual optical system of Example 1; the virtual reality system corresponding to Example 2 is composed of the positioning optical system of Example 4 and the visual optical system of Example 2; the virtual reality system corresponding to Example 3 is composed of the positioning optical system of Example 4 and the visual optical system of Example 3; the virtual reality system corresponding to Example 4 is composed of the positioning optical system of Example 5 and the visual optical system of Example 1; the virtual reality system corresponding to Example 5 is composed of the positioning optical system of Example 5 and the visual optical system of Example 2; and the virtual reality system corresponding to Example 6 is composed of the positioning optical system of Example 5 and the visual optical system of Example 3. The virtual reality system corresponding to Example 7 consists of the positioning optical system of Embodiment 6 and the visual optical system of Embodiment 1. The virtual reality system corresponding to Example 8 consists of the positioning optical system of Embodiment 6 and the visual optical system of Embodiment 2. The virtual reality system corresponding to Example 9 consists of the positioning optical system of Embodiment 6 and the visual optical system of Embodiment 3. The virtual reality system corresponding to Example 10 consists of the positioning optical system of Embodiment 7 and the visual optical system of Embodiment 1. The virtual reality system corresponding to Example 11 consists of the positioning optical system of Embodiment 7 and the visual optical system of Embodiment 2. The virtual reality system corresponding to Example 12 consists of the positioning optical system of Embodiment 7 and the visual optical system of Embodiment 3.

[0185] In summary, Table 15 shows the values ​​of the conditional expressions for each of the examples in Examples 1 to 12.

[0186]

[0187]

[0188] Table 15

[0189] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A virtual reality system comprising a visual optical system and a positioning optical system, characterized in that, the visual optical system comprises in order from a first side to a second side along a first optical axis: a first element group comprising a reflective polarizing element, a first quarter wave plate, a first lens having positive refractive power, and a partially reflective layer arranged in order from the first side to the second side along the first optical axis; a first side of the first lens is a plane, and a second side of the first lens is a convex surface; a second element group comprising a second quarter wave plate and a second lens having negative refractive power arranged in order from the first side to the second side along the first optical axis; a first side of the second lens is a plane, and a second side of the second lens is a concave surface; a third element group comprising a third lens having positive refractive power; a second side of the third lens is a convex surface; a fourth element group comprising a fourth lens having positive refractive power; a second side of the fourth lens is a convex surface; the positioning optical system comprises in order from an object side to an image side along a second optical axis: a first lens having negative refractive power, a convex object side, and a concave image side; a second lens having negative refractive power, a concave image side; a third lens having positive refractive power; a fourth lens having refractive power, a convex object side; a fifth lens having refractive power, a convex image side; wherein the signs of the refractive powers of the fourth lens and the fifth lens are opposite in sign; a number of lenses having refractive power in the visual optical system is four; and a number of lenses having refractive power in the positioning optical system is five; a total effective focal length f' of the visual optical system, a radius of curvature R2' of the second side of the first lens, and a radius of curvature R8' of the second side of the fourth lens satisfy: 3.45 mm ≤ f' / (R2' / R8') ≤ 3.80 mm; and a total effective focal length f of the positioning optical system, a radius of curvature R2 of the image side of the first lens, and a radius of curvature R10 of the image side of the fifth lens satisfy: -5.68 mm ≤ f / (R2 / R10) ≤ -1.10 mm.

2. The virtual reality system of claim 1, wherein, a total effective focal length f' of the visual optical system, a maximum field of view FOV' of the visual optical system, a total effective focal length f of the positioning optical system, and a maximum field of view FOV of the positioning optical system satisfy: 0.79 ≤ (f' x tan(FOV' / 2)) / (f x tan(FOV / 2)) ≤ 2.

01.

3. The virtual reality system of claim 1, wherein, an entrance pupil diameter EPD' of the visual optical system and an entrance pupil diameter EPD of the positioning optical system satisfy: 6.69 ≤ EPD' / EPD ≤ 7.

70.

4. The virtual reality system of claim 1, wherein, an on-axis distance TD' from the first side of the first lens to the second side of the fourth lens and an on-axis distance TTL from the object side of the first lens to an image plane of the positioning optical system satisfy: 1.44 ≤ TD' / TTL ≤ 1.

68.

5. The virtual reality system of claim 1, wherein, a total effective focal length f' of the visual optical system and a total effective focal length f of the positioning optical system satisfy: 9.66 ≤ f' / f ≤ 12.

10.

6. The virtual reality system of claim 1, wherein, A sum of central thicknesses of each of the first lens to the fourth lens on the first optical axis ∑CT' and a sum of central thicknesses of each of the first lens to the fifth lens on the second optical axis ∑CT satisfy: 3.25≤∑CT' / ∑CT≤4.

05.

7. The virtual reality system of claim 1, wherein, An effective focal length f3' of the third element group, an effective focal length f4' of the fourth element group, a refractive index N3' of the third lens, a refractive index N4' of the fourth lens, a central thickness CT3' of the third lens on the first optical axis, and a central thickness CT4' of the fourth lens on the first optical axis satisfy: -1.44≤(f3'+f4')×(N3'-N4') / (CT3'+CT4')≤-1.

12.

8. The virtual reality system of claim 1, wherein, An effective focal length f1' of the first element group, a refractive index N1' of the first lens, a refractive index NR of the reflective polarizing element, and a refractive index NQ1 of the first quarter wave plate satisfy: 12.17mm≤f1' / (NR+NQ1)+f1' / N1'≤12.87mm.

9. The virtual reality system of any one of claims 1 to 6, wherein, An effective focal length f3' of the third element group, an effective focal length f4' of the fourth element group, a curvature radius R6' of the second side of the third lens, and a curvature radius R8' of the second side of the fourth lens satisfy: -0.77≤f3' / R6'-f4' / R8'≤-0.

46.

10. The virtual reality system of any one of claims 1 to 6, wherein, An effective focal length f2' of the second element group, an effective focal length f3' of the third element group, and a total effective focal length f' of the visual optical system satisfy: -13.93≤(f2'+f3') / f'≤-10.

56.

11. The virtual reality system of any one of claims 1 to 6, wherein, An air separation T23' of the second element group and the third element group on the first optical axis, an air separation T34' of the third element group and the fourth element group on the first optical axis, a dispersion coefficient V2' of the second lens, a dispersion coefficient VQ2 of the second quarter wave plate, a dispersion coefficient V3' of the third lens, and a dispersion coefficient V4' of the fourth lens satisfy: 1.44mm≤T23'×(V2'+VQ2)-T34'×(V3'+V4')≤1.83mm.

12. The virtual reality system of any one of claims 1 to 6, wherein, The second side of the visual optical system is provided with an image plane, and a fifth element group is arranged on the image plane, a total effective focal length f' of the visual optical system, a central thickness CT4' of the fourth lens on the first optical axis, and an air separation T4Q of the fourth element group and the fifth element group on the first optical axis satisfy: 3.82≤f' / (CT4'+T4Q)≤6.

25.

13. The virtual reality system of any one of claims 1 to 8, wherein, A total effective focal length f of the positioning optical system and an effective focal length f1 of the first lens satisfy: -0.34≤f / f1≤-0.

20.

14. The virtual reality system of any one of claims 1 to 8, wherein, A total effective focal length f of the positioning optical system, a curvature radius R1 of an object side of the first lens, and a curvature radius R2 of an image side of the first lens satisfy: 0.15≤f / (R1-R2)≤0.

23.

15. The virtual reality system of any one of claims 1 to 8, wherein, The effective focal length f3 of the third lens, the combined focal length f45 of the fourth lens and the fifth lens, the air separation T34 of the third lens and the fourth lens on the second optical axis, the Abbe number V3 of the third lens, the Abbe number V4 of the fourth lens and the Abbe number V5 of the fifth lens satisfy: 0.13≤(f3+f45) / (T34×(V3+V4+V5))≤3.

34.

16. The virtual reality system of any one of claims 1 to 8, wherein, The central thickness CT2 of the second lens on the second optical axis, the air separation T23 of the second lens and the third lens on the second optical axis, the effective focal length f2 of the second lens, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -2.80mm≤(CT2+T23)×f2 / |(R3+R4)|≤-0.13mm.

17. The virtual reality system of any one of claims 1 to 8, wherein, The central thickness CT4 of the fourth lens on the second optical axis, the effective focal length f4 of the fourth lens, the refractive index N4 of the fourth lens, the central thickness CT5 of the fifth lens on the second optical axis, the effective focal length f5 of the fifth lens, the refractive index N5 of the fifth lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.09≤(CT4+CT5) / |(f4+f5)×N4+f45×N5|≤1.

09.

18. The virtual reality system of any one of claims 1 to 8, wherein, The central thickness CT3 of the third lens on the second optical axis, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.05≤CT3 / |R5-R6|≤0.

93.

19. The virtual reality system of any one of claims 1 to 8, wherein, The maximum field angle FOV of the positioning optical system satisfies: 166.51°≤FOV≤170.14°.

20. The virtual reality system of any one of claims 1 to 8, wherein, The total effective focal length f of the positioning optical system, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -0.37≤f / f2+f / f3≤0.11.

Images