Virtual reality system

Abstract

The invention provides a virtual reality system. The virtual reality system comprises a first optical system and a second optical system, the first optical system comprises a first optical lens group, a second optical lens group and a third optical lens group, and the second optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; when the following conditions are satisfied: f2'gt; f ', the axial distance TD' from the first side surface of the first lens of the first optical system to the second side surface of the last lens, the air interval T12'of the first lens and the second lens of the first optical system on the first optical axis, and the air interval T23 'of the second lens and the third lens of the first optical system on the first optical axis satisfy: 7lt; tD ' / (T12' + T23 ') lt; 12, the effective focal length f1'of the first optical lens group of the first optical system and the effective focal length f1 of the first lens of the second optical system meet the following conditions:-44lt; f1 ' / f1lt; and-26. The problems that in the prior art, a virtual reality system is large in size, and the field angle of a perspective system is small are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to a virtual reality system. Background Art

[0002] With the development of virtual reality technology, various virtual reality display devices have entered people's lives, such as VR (virtual reality) head-mounted display devices. VR head-mounted display devices include virtual reality systems for imaging display. Virtual reality systems generally include visual systems and perspective systems. The visual system allows users to enter the virtual world, and combined with the perspective system, the virtual world and the real world can be interacted. Among them, the perspective system mainly captures the real-time image of the real world through the camera, and then combines the captured image with the virtual image, finally allowing the user to "see" the real world in the virtual world.

[0003] However, the current virtual reality system has some problems, such as the overall length of the virtual reality system is relatively large, which makes the VR device large and heavy, and the perspective system of the virtual reality system has a small field of view, which seriously affects the user's physical sense.

[0004] That is to say, the virtual reality system in the prior art has the problems of large size and small field of view of the perspective system. Summary of the invention

[0005] The main purpose of the present invention is to provide a virtual reality system to solve the problems of large volume and small field of view of the virtual reality system in the prior art.

[0006] To achieve the above object, according to one aspect of the present invention, a virtual reality system is provided, which includes a first optical system and a second optical system that cooperate with each other. Among them, the first optical system sequentially includes a first optical lens group, a second optical lens group, and a third optical lens group along the first optical axis direction. The first optical lens group is composed of a first lens and a reflective polarizing element attached to the first lens. The second optical lens group is composed of a second lens and a quarter-wave plate attached to the second lens. The third optical lens group is composed of a third lens. The second optical system sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the second optical axis. When the effective focal length f2' of the second optical lens group of the first optical system and the effective focal length f' of the first optical system satisfy: |f2'| > |f'|, the axial distance TD' from the first side surface of the first lens of the first optical system to the second side surface of the last lens, the air gap T12' between the first lens and the second lens of the first optical system on the first optical axis, and the air gap T23' between the second lens and the third lens of the first optical system on the first optical axis satisfy: 7 < TD' / (T12' + T23') < 12. The effective focal length f1' of the first optical lens group of the first optical system and the effective focal length f1 of the first lens of the second optical system satisfy: -44 < f1' / f1 < -26.

[0007] Further, the first optical system has a diaphragm, and the diaphragm is arranged on the first side of the first optical lens group.

[0008] Further, the second optical system has a diaphragm, and the diaphragm is arranged between the first lens and the second lens.

[0009] Further, the maximum field of view angle FOV of the second optical system and the maximum field of view angle FOV' of the first optical system satisfy: 1.0 < FOV / FOV' < 1.2.

[0010] Further, the entrance pupil diameter EPD' of the first optical system and the entrance pupil diameter EPD of the second optical system satisfy: 4.5 < EPD' / EPD < 6.0.

[0011] Further, the radius of curvature R4' of the second side surface of the second lens of the second optical lens group and the effective focal length f2' of the second optical lens group of the first optical system satisfy: -6.5 < R4' / f2' < -2.5.

[0012] Further, the effective focal length f' of the first optical system, the effective focal length f3 of the third lens of the second optical system, and the effective focal length f4 of the fourth lens of the second optical system satisfy: 4.7 < f' / f4 + f' / f3 < 6.4.

[0013] Furthermore, the effective focal length f' of the first optical system, the effective focal length f2 of the second lens of the second optical system and the effective focal length f3 of the third lens of the second optical system satisfy: 4.8 <f' / f2+f' / f3<6.2。

[0014] Furthermore, the on-axis distance TD from the first side surface of the first lens of the second optical system to the second side surface of the last lens and the maximum value CTmax of the center thickness of all lenses of the second optical system on the second optical axis satisfy the following relationship: 5.9 <TD / CTmax<6.6。

[0015] Furthermore, an effective focal length f3 of the third lens of the second optical system, an effective focal length f4 of the fourth lens of the second optical system and an effective focal length f5 of the fifth lens of the second optical system satisfy: 0.6<(f3+f4) / f5<1.2.

[0016] Furthermore, the center thickness CT1' of the first lens of the first optical system on the first optical axis, the center thickness CT2' of the second lens of the first optical system on the first optical axis, the Abbe number V1' of the first lens of the first optical system and the refractive index N1' of the first lens of the first optical system satisfy: 12<(CT1' / CT2')*(V1' / N1')<51.

[0017] Furthermore, a curvature radius R4' of the second side surface of the second lens of the second optical lens group and a curvature radius R5' of the first side surface of the third lens of the first optical system satisfy: R4' / R5'<1.0.

[0018] Furthermore, the effective focal length f' of the first optical system and the axial distance TD' from the first side surface of the first lens of the first optical system to the second side surface of the last lens satisfy the following relationship: 0.8 <f' / TD'<1.5。

[0019] Furthermore, the distance SD from the aperture of the second optical system to the second side surface of the last lens and the maximum value ATmax of the air interval between two adjacent lenses in the second optical system on the optical axis satisfy the following conditions: 2.3 <SD / ATmax<3.1。

[0020] Furthermore, the effective focal length f1 of the first lens of the second optical system and the refractive index N1 of the first lens of the second optical system satisfy: 2.6<|f1 / N1|<3.3.

[0021] Further, an effective focal length f5 of the fifth lens of the second optical system and a refractive index N5 of the fifth lens of the second optical system satisfy: 2.4<|f5 / N5|<3.8.

[0022] Furthermore, the on-axis distance TD from the first side surface of the first lens of the second optical system to the second side surface of the last lens satisfies 3.7 < TD / ATmax < 4.3, where ATmax is the maximum air gap on the optical axis between two adjacent lenses in the second optical system.

[0023] According to another aspect of the present invention, a virtual reality system is provided, including a first optical system and a second optical system that cooperate with each other. The first optical system sequentially includes a first optical lens group, a second optical lens group, and a third optical lens group along the first optical axis direction. The first optical lens group is composed of a first lens and a reflective polarizing element attached to the first lens. The second optical lens group is composed of a second lens and a quarter-wave plate attached to the second lens. The third optical lens group is composed of a third lens. The second optical system sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the second optical axis. When the effective focal length f2' of the second optical lens group of the first optical system and the effective focal length f' of the first optical system satisfy |f2'| > |f'|, the on-axis distance TD' from the first side surface of the first lens of the first optical system to the second side surface of the last lens, the air gap T12' between the first lens and the second lens of the first optical system on the first optical axis, and the air gap T23' between the second lens and the third lens of the first optical system on the first optical axis satisfy 7 < TD' / (T12' + T23') < 12. The maximum field of view FOV of the second optical system and the maximum field of view FOV' of the first optical system satisfy 1.0 < FOV / FOV' < 1.2.

[0024] Furthermore, the first optical system has a diaphragm, and the diaphragm is arranged on the first side of the first optical lens group.

[0025] Furthermore, the second optical system has a diaphragm, and the diaphragm is arranged between the first lens and the second lens.

[0026] Furthermore, the entrance pupil diameter EPD' of the first optical system and the entrance pupil diameter EPD of the second optical system satisfy 4.5 < EPD' / EPD < 6.0.

[0027] Furthermore, the effective focal length f1' of the first optical lens group of the first optical system and the effective focal length f1 of the first lens of the second optical system satisfy -44 < f1' / f1 < -26. The radius of curvature R4' of the second side surface of the second lens of the second optical lens group and the effective focal length f2' of the second optical lens group of the first optical system satisfy -6.5 < R4' / f2' < -2.5.

[0028] Furthermore, the effective focal length f' of the first optical system, the effective focal length f3 of the third lens of the second optical system and the effective focal length f4 of the fourth lens of the second optical system satisfy: 4.7 <f' / f4+f' / f3<6.4。

[0029] Furthermore, the effective focal length f' of the first optical system, the effective focal length f2 of the second lens of the second optical system and the effective focal length f3 of the third lens of the second optical system satisfy: 4.8 <f' / f2+f' / f3<6.2。

[0030] Furthermore, the on-axis distance TD from the first side surface of the first lens of the second optical system to the second side surface of the last lens and the maximum value CTmax of the center thickness of all lenses of the second optical system on the second optical axis satisfy the following relationship: 5.9 <TD / CTmax<6.6。

[0031] Furthermore, an effective focal length f3 of the third lens of the second optical system, an effective focal length f4 of the fourth lens of the second optical system and an effective focal length f5 of the fifth lens of the second optical system satisfy: 0.6<(f3+f4) / f5<1.2.

[0032] Furthermore, the center thickness CT1' of the first lens of the first optical system on the first optical axis, the center thickness CT2' of the second lens of the first optical system on the first optical axis, the Abbe number V1' of the first lens of the first optical system and the refractive index N1' of the first lens of the first optical system satisfy: 12<(CT1' / CT2')*(V1' / N1')<51.

[0033] Furthermore, a curvature radius R4' of the second side surface of the second lens of the second optical lens group and a curvature radius R5' of the first side surface of the third lens of the first optical system satisfy: R4' / R5'<1.0.

[0034] Furthermore, the effective focal length f' of the first optical system and the axial distance TD' from the first side surface of the first lens of the first optical system to the second side surface of the last lens satisfy the following relationship: 0.8 <f' / TD'<1.5。

[0035] Furthermore, the distance SD from the aperture of the second optical system to the second side surface of the last lens and the maximum value ATmax of the air interval between two adjacent lenses in the second optical system on the optical axis satisfy the following conditions: 2.3 <SD / ATmax<3.1。

[0036] Furthermore, the effective focal length f1 of the first lens of the second optical system and the refractive index N1 of the first lens of the second optical system satisfy: 2.6<|f1 / N1|<3.3.

[0037] Furthermore, the effective focal length f5 of the fifth lens of the second optical system and the refractive index N5 of the fifth lens of the second optical system satisfy: 2.4 < |f5 / N5| < 3.8.

[0038] Furthermore, the on-axis distance TD from the first surface of the first lens of the second optical system to the second surface of the last lens and the maximum air gap ATmax between two adjacent lenses of the second optical system on the optical axis satisfy: 3.7 < TD / ATmax < 4.3.

[0039] Applying the technical solution of the present invention, the virtual reality system includes a first optical system and a second optical system that cooperate with each other. Among them, the first optical system sequentially includes a first optical lens group, a second optical lens group, and a third optical lens group along the first optical axis direction. The first optical lens group is composed of a first lens and a reflective polarizing element attached to the first lens. The second optical lens group is composed of a second lens and a quarter-wave plate attached to the second lens. The third optical lens group is composed of a third lens; the second optical system sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the second optical axis; when the effective focal length f2' of the second optical lens group of the first optical system and the effective focal length f' of the first optical system satisfy: |f2'| > |f'|, the on-axis distance TD' from the first surface of the first lens of the first optical system to the second surface of the last lens, the air gap T12' between the first lens and the second lens of the first optical system on the first optical axis, and the air gap T23' between the second lens and the third lens of the first optical system on the first optical axis satisfy: 7 < TD' / (T12' + T23') < 12, and the effective focal length f1' of the first optical lens group of the first optical system and the effective focal length f1 of the first lens of the second optical system satisfy: -44 < f1' / f1 < -26.

[0040] The first optical system and the second optical system are used together. In this application, the first optical system is a visual system and the second optical system is a perspective system. The first optical system is composed of three lenses. By attaching a reflective polarizing element to the first lens of the first optical system and a quarter-wave plate to the second lens, the refraction and reflection of the light path can be realized, and the length of the light path is shortened, thereby compressing the overall length of the first optical system, realizing the small volume of the virtual reality system, and realizing miniaturization. The second optical system is composed of six lenses. By controlling the above conditional expression, the focal power of the first lens of the second optical system is guaranteed to be negative, which is conducive to increasing the field of view of the system. In addition, by controlling the above conditional expression, the focal power of each lens of the first optical system and the second optical system is reasonably distributed, which is conducive to improving the aberration of the system; at the same time, the air gap between adjacent lenses of the first optical system and the axial distance from the first side of the first lens to the second side of the last lens are controlled, which is conducive to shortening the total length of the first optical system and making the virtual reality system thinner; in addition, the focal length of the first optical system is controlled to make the effective focal length of the first optical system smaller, thereby increasing the field of view of the first optical system, which is conducive to increasing the user's immersive experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0042] Figure 1 A schematic diagram showing a first optical system and a second optical system of a virtual reality system according to an optional embodiment of the present invention being applied to a head mounted device;

[0043] Figure 2 Shows Figure 1 A zoomed-in view of the headset in Figure 1;

[0044] Figure 3 A schematic structural diagram of the first optical system of the first embodiment is shown;

[0045] Figures 4 to 6 They are shown respectively Figure 3 The axial chromatic aberration curve, astigmatism curve and distortion curve of the first optical system;

[0046] Figure 7 A schematic structural diagram of the first optical system of the second embodiment is shown;

[0047] Figures 8 to 10 They are shown respectively Figure 7 The axial chromatic aberration curve, astigmatism curve and distortion curve of the first optical system;

[0048] Fig.11A schematic structural diagram of the first optical system of Embodiment 3 is shown;

[0049] Figure 12 to Figure 14 They are shown respectively Fig.11 The axial chromatic aberration curve, astigmatism curve and distortion curve of the first optical system;

[0050] Fig.15 A schematic diagram of the structure of the second optical system of Embodiment 4 is shown;

[0051] Figures 16 to 18 They are shown respectively Fig.15 The axial chromatic aberration curve, astigmatism curve and distortion curve of the second optical system;

[0052] Fig.19 A schematic structural diagram of the second optical system of Embodiment 4 is shown;

[0053] Figure 20 to Figure 22 They are shown respectively Fig.19 The axial chromatic aberration curve, astigmatism curve and distortion curve of the second optical system;

[0054] Fig.23 A schematic diagram of the structure of the second optical system of Embodiment 4 is shown;

[0055] Figure 24 to Figure 26 They are shown respectively Fig.23 The axial chromatic aberration curve, astigmatism curve and distortion curve of the second optical system. DETAILED DESCRIPTION

[0056] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0057] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0058] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0059] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0060] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0061] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens close to the first side is called the first side of the lens, and the surface of each lens close to the second side is called the second side of the lens. The judgment of the surface shape in the paraxial region can be based on the judgment method of the general knowledgeable person in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial region, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the concave and convex. For the first side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the second side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0062] It should be noted that the left side of the first optical system is the first side, and the right side is the second side. The first side of the first optical system is the human eye side, and the second side is the display side. The image emitted from the display side is imaged on the human eye side. The left side of the second optical system is the first side, and the right side is the second side. The first side of the second optical system is the object side, and the second side is the image side.

[0063] In order to solve the problems of large volume of virtual reality systems in the prior art and small field of view of perspective systems, the present invention provides a virtual reality system.

[0064] like Figures 1 to 26 As shown, in an optional embodiment of the present application.

[0065] The virtual reality system includes a first optical system and a second optical system that cooperate with each other. Among them, the first optical system sequentially includes a first optical lens group, a second optical lens group, and a third optical lens group along the first optical axis direction. The first optical lens group is composed of a first lens and a reflective polarizing element attached to the first lens. The second optical lens group is composed of a second lens and a quarter-wave plate attached to the second lens. The third optical lens group is composed of a third lens. The second optical system sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the second optical axis. When the effective focal length f2' of the second optical lens group of the first optical system and the effective focal length f' of the first optical system satisfy: |f2'| > |f'|, the axial distance TD' from the first side surface of the first lens of the first optical system to the second side surface of the last lens, the air gap T12' between the first lens and the second lens of the first optical system on the first optical axis, and the air gap T23' between the second lens and the third lens of the first optical system on the first optical axis satisfy: 7 < TD' / (T12' + T23') < 12. The effective focal length f1' of the first optical lens group of the first optical system and the effective focal length f1 of the first lens of the second optical system satisfy: -44 < f1' / f1 < -26.

[0066] The first optical system and the second optical system are used in combination. In this application, the first optical system is a visual system, and the second optical system is a perspective system. The first optical system is composed of three lenses. By attaching a reflective polarizing element to the first lens of the first optical system and a quarter-wave plate to the second lens, the refraction and reflection of the optical path can be realized, shortening the length of the optical path, thereby compressing the overall length of the first optical system and achieving a small volume of the virtual reality system, realizing miniaturization. The second optical system is composed of six lenses. By controlling the above conditional formula, it is ensured that the optical power of the first lens of the second optical system is negative, which is beneficial to increasing the field of view angle of the system. In addition, by controlling the above conditional formula, the optical powers of the lenses of the first optical system and the second optical system are reasonably distributed, which is beneficial to improving the aberration of the system. At the same time, by controlling the air gap between adjacent lenses of the first optical system and the axial distance from the first side surface of the first lens to the second side surface of the last lens, it is beneficial to shorten the total length of the first optical system and make the virtual reality system thinner and lighter. In addition, by controlling the focal length of the first optical system, the effective focal length of the first optical system is made smaller, thereby increasing the field of view angle of the first optical system, which is beneficial to increasing the user's immersive experience.

[0067] In this embodiment, the first optical system has a diaphragm, and the diaphragm is arranged on the first side of the first optical lens group. By arranging the diaphragm on the first side of the first optical lens group, it is beneficial to the converging imaging of the imaging light on the first side.

[0068] In this embodiment, the second optical system has a diaphragm, and the diaphragm is disposed between the first lens and the second lens. By disposing the diaphragm between the first lens and the second lens closer to the first side, it is beneficial to the convergence of light rays and the adjustment of the light ray trend, and is beneficial to the smoothness of the light ray trend.

[0069] It should be noted that the above-mentioned reflective polarizing element can be disposed on the first side surface of the first lens or on the second side surface of the first lens, and can be set according to actual conditions. The above-mentioned quarter-wave plate can be disposed on the first side surface of the second lens or on the second side surface of the second lens, and can be set according to actual conditions.

[0070] In this embodiment, the maximum field of view FOV of the second optical system and the maximum field of view FOV' of the first optical system satisfy: 1.0 < FOV / FOV' < 1.2. By controlling the ratio between the maximum field of view FOV of the second optical system and the maximum field of view FOV' of the first optical system, the maximum field of view of the second optical system is made larger than that of the first optical system, which is beneficial to increasing the maximum field of view of the second optical system and enabling the user to see a wider real world.

[0071] In this embodiment, the entrance pupil diameter EPD' of the first optical system and the entrance pupil diameter EPD of the second optical system satisfy: 4.5 < EPD' / EPD < 6.0. By controlling the ratio between the entrance pupil diameter of the first optical system and the entrance pupil diameter of the second optical system, the entrance pupil diameter of the first optical system is made larger than that of the second optical system, which is beneficial to increasing the light flux of the first optical system and thus increasing the brightness of the image.

[0072] In this embodiment, the radius of curvature R4' of the second side surface of the second lens of the second optical lens group and the effective focal length f2' of the second optical lens group of the first optical system satisfy: -6.5 < R4' / f2' < -2.5. By controlling the ratio between the radius of curvature of the second side surface of the second lens of the first optical system and the effective focal length of the second optical lens group of the first optical system, the shape of the second lens is reasonably controlled, which is beneficial to the forming and processing of the second lens. At the same time, the curvature of the second lens is smaller, which is beneficial to the attachment of the quarter-wave plate.

[0073] In this embodiment, the effective focal length f' of the first optical system, the effective focal length f3 of the third lens of the second optical system, and the effective focal length f4 of the fourth lens of the second optical system satisfy: 4.7 < f' / f4 + f' / f3 < 6.4. Satisfying this conditional formula reasonably distributes the optical power, making the effective focal length of the first optical system larger and the effective focal length of the second optical system smaller, and controlling the screen size of the first optical system while also controlling the field of view of the second optical system.

[0074] In this embodiment, the effective focal length f' of the first optical system, the effective focal length f2 of the second lens of the second optical system, and the effective focal length f3 of the third lens of the second optical system satisfy: 4.8 < f' / f2 + f' / f3 < 6.2. Meeting this conditional formula compresses the height of the light rays reflected by the reflective polarizing element in the first optical system, which is beneficial to reducing the size of the screen, making the head-mounted device lightweight and achieving miniaturization; in the second optical system, the height of the light rays passing through the second lens and the third lens is increased to meet the requirements of the CRA.

[0075] In this embodiment, the on-axis distance TD from the first side surface of the first lens of the second optical system to the second side surface of the last lens and the maximum value CTmax of the central thickness of all the lenses of the second optical system on the second optical axis satisfy: 5.9 < TD / CTmax < 6.6. Meeting this conditional formula is beneficial to the molding of each lens of the second optical system and ensures the processability of the lens.

[0076] In this embodiment, the effective focal length f3 of the third lens of the second optical system, the effective focal length f4 of the fourth lens of the second optical system, and the effective focal length f5 of the fifth lens of the second optical system satisfy: 0.6 < (f3 + f4) / f5 < 1.2. Meeting this conditional formula reasonably distributes the optical power of the three lenses, making the optical power of the fourth lens positive to converge the light rays of the outer field of view, which is beneficial to reducing the size of the chip.

[0077] In this embodiment, the central thickness CT1' of the first lens of the first optical system on the first optical axis, the central thickness CT2' of the second lens of the first optical system on the first optical axis, the Abbe number V1' of the first lens of the first optical system, and the refractive index N1' of the first lens of the first optical system satisfy: 12 < (CT1' / CT2')*(V1' / N1') < 51. Meeting this conditional formula makes the central thicknesses of the first lens and the second lens in the first optical system smaller, reducing the total length of the system, which is beneficial to the thin and light of the head-mounted device; in addition, by controlling the Abbe number and refractive index of the first lens, the chromatic aberration of the system can be reduced, thereby improving the imaging quality.

[0078] In this embodiment, the radius of curvature R4' of the second side surface of the second lens of the second optical lens group and the radius of curvature R5' of the first side surface of the third lens of the first optical system satisfy: R4' / R5' < 1.0. Meeting this conditional formula is beneficial to the attachment of the quarter-wave plate on the one hand, reducing the process difficulty, and on the other hand, controlling the refraction angle of the light rays, reducing the height of the light rays, thereby reducing the size of the screen and being beneficial to reducing the weight of the device.

[0079] In this embodiment, the following condition is satisfied between the effective focal length f' of the first optical system and the on-axis distance TD' from the first side surface of the first lens of the first optical system to the second side surface of the last lens: 0.8 < f' / TD' < 1.5. By satisfying this conditional expression, the effective focal length of the first optical system is reduced, the system becomes more compact, which is beneficial to the miniaturization of the virtual reality system.

[0080] In this embodiment, the following condition is satisfied between the distance SD from the aperture stop of the second optical system to the second side surface of the last lens and the maximum value ATmax of the air spaces on the optical axis between two adjacent lenses in the second optical system: 2.3 < SD / ATmax < 3.1. By controlling this conditional expression, the arrangement of each lens of the second optical system becomes more compact, thereby shortening the total length of the second optical system, which is beneficial to the overall machine layout.

[0081] In this embodiment, the following condition is satisfied between the effective focal length f1 of the first lens of the second optical system and the refractive index N1 of the first lens of the second optical system: 2.6 < |f1 / N1| < 3.3. By satisfying this conditional expression, the refraction angle of the light passing through the first lens can be controlled, which is beneficial to the convergence of the off-axis field light, thereby improving the imaging quality.

[0082] In this embodiment, the following condition is satisfied between the effective focal length f5 of the fifth lens of the second optical system and the refractive index N5 of the fifth lens of the second optical system: 2.4 < |f5 / N5| < 3.8. By controlling this conditional expression, the optical power of the fifth lens of the second optical system is negative, and the positive spherical aberration generated by the lens with negative optical power can balance the negative spherical aberration generated by other lenses, which is beneficial to reducing the spherical aberration of the system and improving the imaging quality.

[0083] In this embodiment, the following condition is satisfied between the on-axis distance TD from the first side surface of the first lens of the second optical system to the second side surface of the last lens and the maximum value ATmax of the air spaces on the optical axis between two adjacent lenses in the second optical system: 3.7 < TD / ATmax < 4.3. By controlling this conditional expression, the center thicknesses of the lenses in the second optical system are reasonably distributed, ensuring the formability and processability of each lens. In addition, the length of the system is shortened, which is beneficial to the miniaturization of the second optical system, thereby reducing the size of the chip.

[0084] As Figures 1 to 26 shown, in an alternative embodiment of the present application.

[0085] The virtual reality system includes a first optical system and a second optical system that cooperate with each other. Among them, the first optical system sequentially includes a first optical lens group, a second optical lens group, and a third optical lens group along the first optical axis direction. The first optical lens group is composed of a first lens and a reflective polarizing element attached to the first lens. The second optical lens group is composed of a second lens and a quarter-wave plate attached to the second lens. The third optical lens group is composed of a third lens. The second optical system sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the second optical axis. When the effective focal length f2' of the second optical lens group of the first optical system and the effective focal length f' of the first optical system satisfy: |f2'| > |f'|, the axial distance TD' from the first side surface of the first lens of the first optical system to the second side surface of the last lens, the air gap T12' between the first lens and the second lens of the first optical system on the first optical axis, and the air gap T23' between the second lens and the third lens of the first optical system on the first optical axis satisfy: 7 < TD' / (T12' + T23') < 12. The maximum field of view FOV of the second optical system and the maximum field of view FOV' of the first optical system satisfy: 1.0 < FOV / FOV' < 1.2.

[0086] The first optical system and the second optical system are used in combination. In this application, the first optical system is a visual system, and the second optical system is a perspective system. The first optical system is composed of three lenses. By attaching a reflective polarizing element to the first lens of the first optical system and a quarter-wave plate to the second lens, the refraction and reflection of the light path can be realized, shortening the length of the light path, thereby compressing the overall length of the first optical system and achieving a small volume of the virtual reality system, realizing miniaturization. The second optical system is composed of six lenses. By controlling the above conditional formula, it is ensured that the optical power of the first lens of the second optical system is negative, which is beneficial to increasing the field of view angle of the system. At the same time, the air gap and distance of the first optical system are beneficial to shortening the total length of the first optical system, realizing the miniaturization of the first optical system, and making the virtual reality system meet the requirements of being thin and light. By controlling the ratio between the maximum field of view FOV of the second optical system and the maximum field of view FOV' of the first optical system, the maximum field of view of the second optical system is greater than that of the first optical system, which is beneficial to increasing the maximum field of view of the second optical system and enabling users to see a wider real world.

[0087] In this embodiment, the first optical system has a diaphragm, and the diaphragm is arranged on the first side of the first optical lens group. By arranging the diaphragm on the first side of the first optical lens group, it is beneficial to the convergent imaging of the imaging light on the first side.

[0088] In this embodiment, the second optical system has a diaphragm, and the diaphragm is disposed between the first lens and the second lens. By disposing the diaphragm between the first lens and the second lens closer to the first side, it is beneficial to the convergence of light rays and the adjustment of the light ray trend, and is beneficial to the smoothness of the light ray trend.

[0089] It should be noted that the above-mentioned reflective polarizing element can be disposed on the first side surface of the first lens or on the second side surface of the first lens, and can be set according to actual conditions. The above-mentioned quarter-wave plate can be disposed on the first side surface of the second lens or on the second side surface of the second lens, and can be set according to actual conditions.

[0090] In this embodiment, the entrance pupil diameter EPD' of the first optical system and the entrance pupil diameter EPD of the second optical system satisfy: 4.5 < EPD' / EPD < 6.0. By controlling the ratio between the entrance pupil diameter of the first optical system and the entrance pupil diameter of the second optical system, making the entrance pupil diameter of the first optical system larger than that of the second optical system is beneficial to improving the light flux of the first optical system, thereby increasing the brightness of the image.

[0091] In this embodiment, the effective focal length f1' of the first optical lens group of the first optical system and the effective focal length f1 of the first lens of the second optical system satisfy: -44 < f1' / f1 < -26. By controlling the ratio between the effective focal length of the first optical lens group of the first optical system and the effective focal length of the second lens of the second optical system, making the effective focal length of the first optical system smaller, thereby increasing the field of view angle of the first optical system, which is beneficial to increasing the user's immersive experience.

[0092] In this embodiment, the radius of curvature R4' of the second side surface of the second lens of the second optical lens group and the effective focal length f2' of the second optical lens group of the first optical system satisfy: -6.5 < R4' / f2' < -2.5. By controlling the ratio between the radius of curvature of the second side surface of the second lens of the first optical system and the effective focal length of the second optical lens group of the first optical system, the shape of the second lens is reasonably controlled, which is beneficial to the forming and processing of the second lens, and at the same time makes the curvature of the second lens smaller, which is beneficial to the attachment of the quarter-wave plate.

[0093] In this embodiment, the effective focal length f' of the first optical system, the effective focal length f3 of the third lens of the second optical system, and the effective focal length f4 of the fourth lens of the second optical system satisfy: 4.7 < f' / f4 + f' / f3 < 6.4. Satisfying this conditional expression reasonably distributes the optical power, making the effective focal length of the first optical system larger and the effective focal length of the second optical system smaller, while controlling the screen size of the first optical system and also controlling the field of view of the second optical system.

[0094] In this embodiment, the effective focal length f' of the first optical system, the effective focal length f2 of the second lens of the second optical system, and the effective focal length f3 of the third lens of the second optical system satisfy: 4.8 < f' / f2 + f' / f3 < 6.2. Satisfying this conditional expression compresses the height of the light rays reflected by the reflective polarizing element in the first optical system, which is conducive to reducing the size of the screen, making the head-mounted device lightweight, and achieving miniaturization; in the second optical system, the height of the light rays passing through the second lens and the third lens is increased, meeting the requirements of the CRA.

[0095] In this embodiment, the on-axis distance TD from the first side surface of the first lens of the second optical system to the second side surface of the last lens and the maximum value CTmax of the central thicknesses of all the lenses of the second optical system on the second optical axis satisfy: 5.9 < TD / CTmax < 6.6. Satisfying this conditional expression is conducive to the molding of each lens of the second optical system and ensures the processability of the lenses.

[0096] In this embodiment, the effective focal length f3 of the third lens of the second optical system, the effective focal length f4 of the fourth lens of the second optical system, and the effective focal length f5 of the fifth lens of the second optical system satisfy: 0.6 < (f3 + f4) / f5 < 1.2. Satisfying this conditional expression reasonably distributes the optical powers of the three lenses, making the optical power of the fourth lens positive to converge the light rays of the outer field of view, which is conducive to reducing the size of the chip.

[0097] In this embodiment, the central thickness CT1' of the first lens of the first optical system on the first optical axis, the central thickness CT2' of the second lens of the first optical system on the first optical axis, the Abbe number V1' of the first lens of the first optical system, and the refractive index N1' of the first lens of the first optical system satisfy: 12 < (CT1' / CT2')*(V1' / N1') < 51. Satisfying this conditional expression makes the central thicknesses of the first lens and the second lens in the first optical system smaller, reducing the total length of the system, which is conducive to the thin and light of the head-mounted device; in addition, by controlling the Abbe number and refractive index of the first lens, the chromatic aberration of the system can be reduced, thereby improving the imaging quality.

[0098] In this embodiment, the radius of curvature R4' of the second side surface of the second lens of the second optical lens group and the radius of curvature R5' of the first side surface of the third lens of the first optical system satisfy: R4' / R5' < 1.0. Satisfying this conditional expression is conducive to the attachment of the quarter-wave plate on the one hand, reducing the process difficulty, and on the other hand, controlling the refraction angle of the light rays, reducing the height of the light rays, thereby reducing the size of the screen and being conducive to reducing the weight of the device.

[0099] In this embodiment, the following condition is satisfied between the effective focal length f' of the first optical system and the on-axis distance TD' from the first side surface of the first lens of the first optical system to the second side surface of the last lens: 0.8 < f' / TD' < 1.5. By satisfying this conditional expression, the effective focal length of the first optical system is reduced, the system becomes more compact, which is beneficial to the miniaturization of the virtual reality system.

[0100] In this embodiment, the following condition is satisfied between the distance SD from the aperture stop of the second optical system to the second side surface of the last lens and the maximum value ATmax of the air spaces on the optical axis between two adjacent lenses in the second optical system: 2.3 < SD / ATmax < 3.1. By controlling this conditional expression, the arrangement of each lens of the second optical system becomes more compact, thereby shortening the total length of the second optical system, which is beneficial to the overall machine layout.

[0101] In this embodiment, the following condition is satisfied between the effective focal length f1 of the first lens of the second optical system and the refractive index N1 of the first lens of the second optical system: 2.6 < |f1 / N1| < 3.3. By satisfying this conditional expression, the refraction angle of the light passing through the first lens can be controlled, which is beneficial to the convergence of the off-axis field light, thereby improving the imaging quality.

[0102] In this embodiment, the following condition is satisfied between the effective focal length f5 of the fifth lens of the second optical system and the refractive index N5 of the fifth lens of the second optical system: 2.4 < |f5 / N5| < 3.8. By controlling this conditional expression, the optical power of the fifth lens of the second optical system is negative, and the positive spherical aberration generated by the negative optical power lens can balance the negative spherical aberration generated by other lenses, which is beneficial to reducing the spherical aberration of the system and improving the imaging quality.

[0103] In this embodiment, the following condition is satisfied between the on-axis distance TD from the first side surface of the first lens of the second optical system to the second side surface of the last lens and the maximum value ATmax of the air spaces on the optical axis between two adjacent lenses in the second optical system: 3.7 < TD / ATmax < 4.3. By controlling this conditional expression, the center thicknesses of the lenses in the second optical system are reasonably distributed, ensuring the formability and processability of each lens. In addition, the length of the system is shortened, which is beneficial to the miniaturization of the second optical system, thereby reducing the size of the chip.

[0104] Of course, in the specific embodiment of the present application, the second optical system further includes a prism, and the prism is disposed between the first lens and the second lens of the second optical system.

[0105] Optionally, the first optical system and the second optical system of the virtual reality system may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. By properly setting the first optical system and the second optical system, the virtual reality system of the present application can be applied to a head-mounted or portable VR device.

[0106] In the present application, at least one of the surfaces of each lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0107] Since the aspheric surface is a structure obtained by rotating the curved surface in the meridian plane around the optical axis, the structure has rotational symmetry. In an ideal optical system, the aberrations in the meridian and sagittal planes can be well corrected. At the same time, due to its unique lens model, it can provide sufficient space for subsequent related adjustments, making the related structure and assembly process more flexible so as not to reduce the image quality too much.

[0108] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the virtual reality system can be changed to obtain the various results and advantages described in this specification. For example, although the first optical system is described as three lenses and the second optical system is described as six lenses in the embodiment, the virtual reality system is not limited to including the above number of lenses. If necessary, the virtual reality system may also include other numbers of lenses.

[0109] The following further describes examples of specific surface shapes and parameters of the first optical system and the second optical system applicable to the virtual reality system of the above-mentioned embodiment with reference to the accompanying drawings.

[0110] It should be noted that any one of the following embodiments 1 to 6 is applicable to all implementations of the present application. Embodiments 1 to 3 describe the first optical system of the virtual reality system, and embodiments 4 to 6 describe the second optical system of the virtual reality system, wherein any one of the first optical systems in embodiments 1 to 3 can be used in combination with any one of the second optical systems in embodiments 4 to 6.

[0111] like Figure 1As shown in FIG. 1 , the first optical system 10 and the second optical system 20 of the virtual reality system of the present application are applied in the head mounted device. Of course, the virtual reality system of the present application is not limited to the two systems of the first optical system 10 and the second optical system 20, that is, the virtual reality system of the present application can have three, four or more systems. Figure 2 As shown, Figure 1 A zoomed-in view of the headset. Figures 3 to 14 Three embodiments of the first optical system 10 are described. Figures 15 to 26 Three embodiments of the second optical system 20 are described.

[0112] Embodiment 1

[0113] like Figures 3 to 6 As shown, the first optical system 10 of the virtual reality system of the first embodiment of the present application is described. Figure 1 The optical path diagram of the first optical system 10 of the first embodiment is shown.

[0114] like Figure 3 As shown, the first optical system 10 of the virtual reality system includes, from the first side to the second side, an aperture STO, a first lens E1, a reflective polarizing element RP, a second lens E2, a quarter wave plate QWP1, a third lens E3, and a light emitting surface S9 of the display. The reflective polarizing element RP is bonded to the second side surface S2 of the first lens, and the quarter wave plate QWP1 is bonded to the second side surface S5 of the second lens.

[0115] The first lens E1 has positive power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is flat. The second lens E2 has positive power, the first side surface S4 of the second lens is convex, and the second side surface S5 of the second lens is convex. The third lens E3 has positive power, the first side surface S7 of the third lens is concave, and the second side surface S8 of the third lens is convex.

[0116] In this embodiment, the total effective focal length f' of the first optical system 10 is 21.38 mm, the focal length f1' of the first lens of the first optical system 10 is 167.95 mm, the focal length f2' of the second lens of the first optical system 10 is 22.38 mm, the focal length f3' of the third lens of the first optical system 10 is 272.11 mm, the maximum field of view FOV' of the first optical system 10 is 90.00°, and the entrance pupil diameter EPD' of the first optical system 10 is 5.25 mm.

[0117] Combining Table 1 and Figure 3The light emitted from the light emitting surface S9 of the display of the first optical system 10 of the first embodiment passes through the third lens E3, the quarter wave plate QWP1, and the second lens E2 in sequence, and then is incident on the second side surface S3 of the reflective polarizing element, and the first reflection occurs. The light reflected for the first time passes through the second lens E2, the quarter wave plate QWP1, and the first side surface S7 of the third lens in sequence, and then is incident on the second side surface S8 of the third lens, and the second reflection occurs. The reflected light passes through the first side surface S7 of the third lens, the quarter wave plate QWP1, the second lens E2, the reflective polarizing element RP, and the first lens E1 in sequence to reach the aperture STO. Since the reflective polarizing element RP and the second side surface S2 of the first lens, the second side surface S2 of the first lens and the first side surface S2 of the reflective polarizing element are the same surface, and S3 is the second side surface of the reflective polarizing element; since the quarter wave plate QWP1 is attached to the second side surface S5 of the second lens, the second side surface S5 of the second lens and the first side surface S5 of the quarter wave plate are the same surface, and S6 is the second side surface of the quarter wave plate.

[0118] Table 1 shows a basic structural parameter table of the virtual reality system of Example 1, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0119]

[0120] Table 1

[0121] In the first embodiment, the first side surface S1 of the first lens, the two side surfaces of the second lens, and the two side surfaces of the third lens are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0122]

[0123] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficients A4, A6, A8, and A10 that can be used for each aspheric mirror surface S1-S8 in Example 1.

[0124] Face number A4 A6 A8 A10 S1 2.5393E-06 -1.9531E-09 1.4653E-12 0.0000E+00 S4 -1.4209E-06 -1.0413E-09 -5.6062E-13 -6.9795E-16 S5 8.5369E-07 4.1432E-10 -1.3989E-13 0.0000E+00 S7 -8.4494E-07 -6.8452E-10 -3.1386E-13 0.0000E+00 S8 2.9853E-08 -2.1967E-10 -5.9126E-13 0.0000E+00

[0125] Table 2

[0126] Figure 4 The axial chromatic aberration curve of the first optical system 10 of the virtual reality system of the first embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the first optical system 10. Figure 5The astigmatism curve of the first optical system 10 of the virtual reality system of the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 6 The distortion curve of the first optical system 10 of the virtual reality system of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0127] according to Figures 4 to 6 It can be seen that the first optical system 10 provided in the first embodiment can achieve good imaging quality.

[0128] Embodiment 2

[0129] like Figures 7 to 10 As shown, the first optical system 10 of the virtual reality system of the second embodiment of the present application is described. Figure 7 The optical path diagram of the first optical system 10 of the second embodiment is shown.

[0130] like Figure 7 As shown, the first optical system 10 of the virtual reality system includes, from the first side to the second side, an aperture STO, a reflective polarizing element RP, a first lens E1, a quarter wave plate QWP1, a second lens E2, a third lens E3, and a light emitting surface S9 of the display. The reflective polarizing element RP is bonded to the first side surface S2 of the first lens, and the quarter wave plate QWP1 is bonded to the first side surface S5 of the second lens.

[0131] The first lens E1 has positive power, the first side surface S2 of the first lens is a plane, and the second side surface S3 of the first lens is a convex surface. The second lens E2 has positive power, the first side surface S5 of the second lens is a concave surface, and the second side surface S6 of the second lens is a convex surface. The third lens E3 has positive power, the first side surface S7 of the third lens is a concave surface, and the second side surface S8 of the third lens is a convex surface.

[0132] In this embodiment, the total effective focal length f' of the first optical system 10 is 20.02 mm, the focal length f1' of the first lens of the first optical system 10 is 176.72 mm, the focal length f2' of the second lens of the first optical system 10 is 21.68 mm, the focal length f3' of the third lens of the first optical system 10 is 150.91 mm, the maximum field of view FOV' of the first optical system 10 is 90.00°, and the entrance pupil diameter EPD' of the first optical system 10 is 4.90 mm.

[0133] Combining Table 3 and Figure 7The light emitted from the light emitting surface S9 of the display of the first optical system 10 of the second embodiment passes through the third lens E3, the second lens E2, the quarter wave plate QWP1, and the first lens E1 in sequence, and then is incident on the second side surface S2 of the reflective polarizing element, and the first reflection occurs. The light reflected for the first time passes through the second side surface S3 of the first lens, the quarter wave plate QWP1, the second lens E2, and the first side surface S7 of the third lens in sequence, and then is incident on the second side surface S8 of the third lens, and the second reflection occurs. The light reflected for the second time passes through the first side surface S7 of the third lens, the second lens E2, the quarter wave plate QWP1, the first lens E1, and the reflective polarizing element RP in sequence to reach the aperture STO. Since the reflective polarizing element RP and the first side surface S2 of the first lens, the first side surface S2 of the first lens and the second side surface S2 of the reflective polarizing element are the same surface, and S1 is the first side surface of the reflective polarizing element; since the quarter wave plate QWP1 is attached to the first side surface S5 of the second lens, the first side surface S5 of the second lens and the second side surface S5 of the quarter wave plate are the same surface, and S4 is the first side surface of the quarter wave plate.

[0134] Table 3 shows a basic structural parameter table of the virtual reality system of Example 2, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0135]

[0136] Table 3

[0137] Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in the second embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the first embodiment above.

[0138] Face number A4 A6 A8 A10 S3 -7.1165E-07 6.5330E-10 -9.8052E-12 -2.5702E-15 S5 4.9810E-07 4.7763E-09 1.7517E-12 0.0000E+00 S6 -6.5112E-06 -1.2440E-09 1.8892E-12 3.5214E-14 S7 -6.5706E-06 -1.8062E-09 -3.5941E-12 0.0000E+00 S8 -4.7393E-07 5.6134E-10 -1.1332E-12 -1.9378E-15

[0139] Table 4

[0140] Figure 8 The axial chromatic aberration curve of the first optical system 10 of the virtual reality system of the second embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the first optical system 10. Fig. 9 The astigmatism curve of the first optical system 10 of the virtual reality system of the second embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.10 The distortion curve of the first optical system 10 of the virtual reality system of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0141] according to Figures 8 to 10 It can be seen that the first optical system 10 provided in the second embodiment can achieve good imaging quality.

[0142] Embodiment 3

[0143] like Figures 11 to 14 As shown, the first optical system 10 of the virtual reality system of the third embodiment of the present application is described. Fig.11 The optical path diagram of the first optical system 10 of the third embodiment is shown.

[0144] like Fig.11 As shown, the first optical system 10 of the virtual reality system includes, from the first side to the second side, an aperture STO, a first lens E1, a reflective polarizing element RP, a second lens E2, a quarter wave plate QWP1, a third lens E3, and a light emitting surface S9 of the display. The reflective polarizing element RP is bonded to the second side surface S2 of the first lens, and the quarter wave plate QWP1 is bonded to the second side surface S5 of the second lens.

[0145] The first lens E1 has positive power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is flat. The second lens E2 has positive power, the first side surface S4 of the second lens is convex, and the second side surface S5 of the second lens is convex. The third lens E3 has positive power, the first side surface S7 of the third lens is concave, and the second side surface S8 of the third lens is convex.

[0146] In this embodiment, the total effective focal length f' of the first optical system 10 is 19.24 mm, the focal length f1' of the first lens of the first optical system 10 is 135.78 mm, the focal length f2' of the second lens of the first optical system 10 is 19.48 mm, the focal length f3' of the third lens of the first optical system 10 is -144.89 mm, the maximum field of view FOV' of the first optical system 10 is 90.00°, and the entrance pupil diameter EPD' of the first optical system 10 is 4.90 mm.

[0147] Combining Table 5 and Fig.11The light emitted from the light emitting surface S9 of the display of the first optical system 10 of the third embodiment passes through the third lens E3, the quarter wave plate QWP1, and the second lens E2 in sequence, and then is incident on the second side surface S3 of the reflective polarizing element, and the first reflection occurs. The light reflected for the first time passes through the second lens E2 and the quarter wave plate QWP1 in sequence, and is incident on the first side surface S7 of the third lens, and the second reflection occurs. The light reflected for the second time passes through the quarter wave plate QWP1, the second lens E2, the reflective polarizing element RP, and the first lens E1 in sequence to reach the aperture STO. Since the reflective polarizing element RP and the second side surface S2 of the first lens are the same surface as the first side surface S2 of the reflective polarizing element, S3 is the second side surface of the reflective polarizing element; since the quarter wave plate QWP1 is attached to the second side surface S5 of the second lens, the second side surface S5 of the second lens and the first side surface S5 of the quarter wave plate are the same surface, and S6 is the second side surface of the quarter wave plate.

[0148] Table 5 shows a basic structural parameter table of the virtual reality system of Example 3, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0149]

[0150] Table 5

[0151] Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in the third embodiment, wherein each aspherical surface shape can be defined by the formula (1) given in the first embodiment above.

[0152] Face number A4 A6 A8 A10 S1 -2.1604E-06 -2.9236E-10 -5.7070E-12 0.0000E+00 S4 -7.1007E-07 -1.3611E-09 -2.1716E-12 0.0000E+00 S5 4.9510E-06 -3.6051E-09 5.2478E-12 -3.0403E-15 S7 -1.9748E-06 2.2638E-09 -3.7429E-12 0.0000E+00 S8 -1.4820E-05 -2.5687E-08 7.7340E-11 -2.4935E-14

[0153] Table 6

[0154] Fig.12 The axial chromatic aberration curve of the first optical system 10 of the virtual reality system of the third embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the first optical system 10. Fig.13 The astigmatism curve of the first optical system 10 of the virtual reality system of the third embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.14 The distortion curve of the first optical system 10 of the virtual reality system of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0155] according to Figure 12 to Figure 14 It can be seen that the first optical system 10 provided in the third embodiment can achieve good imaging quality.

[0156] Embodiment 4

[0157] like Figures 15 to 18As shown, the second optical system 20 of the virtual reality system of the fourth embodiment of the present application is described. Fig.15 A schematic structural diagram of the second optical system 20 of the fourth embodiment is shown.

[0158] like Fig.15 As shown, the second optical system 20 of the virtual reality system includes, from the first side to the second side, a first lens E1, a prism T, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective glass E7 and an imaging surface S15.

[0159] The first lens E1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is convex. The second lens E2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is convex. The third lens E3 has negative power, the first side surface S5 of the third lens is convex, and the second side surface S6 of the third lens is concave. The fourth lens E4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex. The fifth lens E5 has negative power, the first side surface S9 of the fifth lens is convex, and the second side surface S10 of the fifth lens is concave. The sixth lens E6 has negative power, the first side surface S11 of the sixth lens is convex, and the second side surface S12 of the sixth lens is concave. The protective glass E7 has a first side surface S13 of the protective glass and a second side surface S14 of the protective glass. Light from an object passes through each surface S1 to S14 in sequence and is finally imaged on an imaging surface S15.

[0160] In this embodiment, the total optical length TTL of the second optical system 20 is 5.02 mm, the image height ImgH of the second optical system 20 is 2.15 mm, the maximum field angle FOV of the second optical system 20 is 102.87°, the aperture value Fno of the second optical system 20 is 2.22, the total effective focal length f of the second optical system 20 is 2.01 mm, the focal length f1 of the first lens of the second optical system 20 is -4.07 mm, the focal length f2 of the second lens of the second optical system 20 is 2.25 mm, the focal length f3 of the third lens of the second optical system 20 is -6.47 mm, the focal length f4 of the fourth lens of the second optical system 20 is 2.23 mm, the focal length f5 of the fifth lens of the second optical system 20 is -4.46 mm, and the focal length f6 of the sixth lens of the second optical system 20 is -29.21 mm.

[0161] Table 7 shows a basic structural parameter table of the virtual reality system of Example 4, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0162]

[0163]

[0164] Table 7

[0165] Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in the fourth embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the first embodiment above.

[0166] Face number A4 A6 A8 A10 A12 A14 S1 3.8130E-01 -2.6463E-02 1.7039E-03 -1.0597E-03 3.7927E-04 4.5886E-05 S2 3.8130E-01 -2.6463E-02 1.7039E-03 -1.0597E-03 3.7927E-04 4.5886E-05 S3 7.4391E-03 -4.0785E-03 -8.9204E-04 -1.8027E-04 -4.3442E-05 5.6850E-08 S4 -5.3799E-02 -4.0122E-03 -2.1873E-03 1.1467E-04 -1.1400E-04 2.5000E-05 S5 -7.8673E-02 1.1676E-03 1.0303E-03 4.3396E-04 2.0853E-05 6.3625E-06 S6 -2.6757E-02 6.9975E-03 2.2540E-03 2.5133E-04 -3.9098E-05 -1.9912E-05 S7 -3.4209E-02 1.1081E-02 6.1399E-03 1.1429E-04 -5.2514E-04 -9.5054E-05 S8 -4.5898E-03 4.8839E-03 1.2388E-02 -3.0161E-04 1.3823E-03 -2.9420E-04 S9 -1.7096E-01 -2.0893E-02 1.0441E-02 -5.7430E-03 9.6769E-04 -3.8959E-04 S10 -2.6449E-01 4.0290E-02 -1.4474E-03 -5.1733E-03 1.2449E-03 3.9840E-04 S11 -5.1486E-01 8.3399E-02 2.5833E-02 -1.9580E-02 3.0415E-03 -1.0459E-03 S12 -1.1064E+00 1.6165E-01 -4.3576E-02 1.7273E-02 -6.8241E-03 1.9800E-03 Face number A16 A18 A20 A22 A24 A26 S1 5.4493E-07 -1.7883E-06 5.9606E-06 0.0000E+00 0.0000E+00 0.0000E+00 S2 5.4493E-07 -1.7883E-06 5.9606E-06 0.0000E+00 0.0000E+00 0.0000E+00 S3 -9.6834E-07 5.9671E-06 1.7198E-06 0.0000E+00 0.0000E+00 0.0000E+00 S4 -7.5164E-06 3.6238E-07 -2.9762E-06 0.0000E+00 0.0000E+00 0.0000E+00 S5 -1.2877E-05 -1.4532E-06 -3.8005E-06 0.0000E+00 0.0000E+00 0.0000E+00 S6 -5.6559E-06 -6.1437E-06 -3.2402E-07 0.0000E+00 0.0000E+00 0.0000E+00 S7 3.2369E-05 2.2282E-05 -5.7530E-06 0.0000E+00 0.0000E+00 0.0000E+00 S8 2.0381E-04 -2.7903E-05 3.7012E-05 0.0000E+00 0.0000E+00 0.0000E+00 S9 3.0411E-04 -8.8312E-05 2.1660E-05 -2.0100E-05 0.0000E+00 0.0000E+00 S10 -1.3210E-04 -2.4553E-05 -1.1580E-05 5.9227E-05 0.0000E+00 0.0000E+00 S11 3.0585E-03 -1.7050E-03 3.9484E-04 -1.7623E-04 2.8200E-04 -1.1452E-04 S12 -4.0220E-04 4.5648E-04 9.6679E-05 0.0000E+00 0.0000E+00 0.0000E+00

[0167] Table 8

[0168] Fig.16 The axial chromatic aberration curve of the second optical system 20 of the virtual reality system of the fourth embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the second optical system 20. Fig.17 The astigmatism curve of the second optical system 20 of the virtual reality system of the fourth embodiment is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig.18 The distortion curve of the second optical system 20 of the virtual reality system of the fourth embodiment is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0169] according to Figures 16 to 18 It can be seen that the second optical system 20 provided in the fourth embodiment can achieve good imaging quality.

[0170] Embodiment 5

[0171] like Figures 19 to 22 As shown, the second optical system 20 of the virtual reality system of the fifth embodiment of the present application is described. Fig.19 A schematic structural diagram of the second optical system 20 of the fifth embodiment is shown.

[0172] like Fig.19 As shown, the second optical system 20 of the virtual reality system includes, from the first side to the second side, a first lens E1, a prism T, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective glass E7 and an imaging surface S15.

[0173] The first lens E1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is convex. The second lens E2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is convex. The third lens E3 has negative power, the first side surface S5 of the third lens is convex, and the second side surface S6 of the third lens is concave. The fourth lens E4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex. The fifth lens E5 has negative power, the first side surface S9 of the fifth lens is convex, and the second side surface S10 of the fifth lens is concave. The sixth lens E6 has positive power, the first side surface S11 of the sixth lens is convex, and the second side surface S12 of the sixth lens is concave. The protective glass E7 has a first side surface S13 of the protective glass and a second side surface S14 of the protective glass. Light from an object passes through each surface S1 to S14 in sequence and is finally imaged on an imaging surface S15.

[0174] In this embodiment, the total optical length TTL of the second optical system 20 is 5.55 mm, the image height ImgH of the second optical system 20 is 2.26 mm, the maximum field angle FOV of the second optical system 20 is 97.98°, the aperture value Fno of the second optical system 20 is 2.22, the total effective focal length f of the second optical system 20 is 2.23 mm, the focal length f1 of the first lens of the second optical system 20 is -5.08 mm, the focal length f2 of the second lens of the second optical system 20 is 2.56 mm, the focal length f3 of the third lens of the second optical system 20 is -7.14 mm, the focal length f4 of the fourth lens of the second optical system 20 is 2.54 mm, the focal length f5 of the fifth lens of the second optical system 20 is -4.08 mm, and the focal length f6 of the sixth lens of the second optical system 20 is 36.99 mm.

[0175] Table 9 shows a basic structural parameter table of the virtual reality system of Example 5, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0176]

[0177]

[0178] Table 9

[0179] Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in the fifth embodiment, wherein each aspherical surface shape can be defined by the formula (1) given in the first embodiment above.

[0180] Face number A4 A6 A8 A10 A12 A14 A16 S1 4.4266E-01 -7.1797E-02 1.1278E-02 -3.0709E-03 9.0595E-04 -2.6401E-04 9.1013E-05 S2 4.1583E-01 -2.3936E-02 1.2216E-03 -1.6504E-03 4.5418E-05 -3.3990E-05 1.9486E-05 S3 -1.2350E-03 -3.8055E-03 -5.3759E-04 -7.6531E-05 -1.5976E-05 -1.7100E-06 -7.8170E-07 S4 -9.3814E-02 -6.4646E-04 -2.4266E-03 5.2874E-04 -2.6537E-04 9.5650E-05 -1.1232E-05 S5 -9.7856E-02 9.4165E-03 9.4523E-05 4.5334E-04 -3.4177E-04 6.8171E-05 -1.0818E-05 S6 -2.6897E-02 1.0716E-02 2.0594E-03 -1.2080E-04 -3.7499E-04 -1.1617E-04 -3.0556E-06 S7 -4.7901E-02 5.6933E-03 4.6371E-03 3.7992E-04 -4.7555E-04 -2.7232E-04 -3.2765E-05 S8 -1.6620E-02 -4.3513E-03 7.4457E-03 8.9570E-06 7.5431E-04 -1.0123E-04 -1.4918E-05 S9 -1.6335E-01 -3.2074E-02 7.7293E-03 -2.8772E-03 3.7390E-04 -7.3855E-05 -1.8496E-05 S10 -2.4196E-01 2.4840E-02 2.4283E-03 -1.1147E-03 -8.2178E-04 8.2729E-04 -4.3396E-04 S11 -4.0070E-01 2.3329E-02 2.8691E-02 -1.5547E-02 4.8521E-03 -2.8315E-03 2.8341E-03 S12 -1.0158E+00 1.2970E-01 -4.9733E-02 1.3112E-02 -7.6986E-03 2.5869E-03 -7.6508E-04 Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.9901E-05 1.1850E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -6.3193E-06 3.9833E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 9.1228E-07 4.2926E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 1.3461E-05 -3.0377E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 1.5884E-05 -5.9074E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 6.6351E-06 6.5177E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 2.2696E-05 1.3227E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -3.1534E-05 -7.9440E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 -2.9344E-05 -3.0988E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 1.8311E-04 -1.0725E-04 6.1275E-05 -1.5842E-05 0.0000E+00 0.0000E+00 0.0000E+00 S11 -1.3810E-03 6.7870E-04 -4.1652E-04 2.6649E-04 -1.7348E-04 8.1922E-05 -4.0471E-05 S12 5.4855E-04 -7.3915E-06 2.0275E-04 1.1277E-04 2.2844E-05 1.0372E-05 -4.6127E-05

[0181] Table 10

[0182] Fig. 20 The axial chromatic aberration curve of the second optical system 20 of the virtual reality system of the fifth embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the second optical system 20. Fig.21 The astigmatism curve of the second optical system 20 of the virtual reality system of the fifth embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 22 The distortion curve of the second optical system 20 of the virtual reality system of the fifth embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0183] according to Figure 20 to Figure 22 It can be seen that the second optical system 20 provided in the fifth embodiment can achieve good imaging quality.

[0184] Embodiment 6

[0185] like Figure 23 to Figure 26 As shown, the second optical system 20 of the virtual reality system of the sixth embodiment of the present application is described. Fig.23 A schematic structural diagram of the second optical system 20 of the sixth embodiment is shown.

[0186] like Fig.23 As shown, the second optical system 20 of the virtual reality system includes, from the first side to the second side, a first lens E1, a prism T, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective glass E7 and an imaging surface S15.

[0187] The first lens E1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is convex. The second lens E2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is convex. The third lens E3 has negative power, the first side surface S5 of the third lens is convex, and the second side surface S6 of the third lens is concave. The fourth lens E4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex. The fifth lens E5 has negative power, the first side surface S9 of the fifth lens is convex, and the second side surface S10 of the fifth lens is concave. The sixth lens E6 has negative power, the first side surface S11 of the sixth lens is convex, and the second side surface S12 of the sixth lens is concave. The protective glass E7 has a first side surface S13 of the protective glass and a second side surface S14 of the protective glass. Light from an object passes through each surface S1 to S14 in sequence and is finally imaged on an imaging surface S15.

[0188] In this embodiment, the total optical length TTL of the second optical system 20 is 5.20 mm, the image height ImgH of the second optical system 20 is 2.31 mm, the maximum field angle FOV of the second optical system 20 is 102.00°, the aperture value Fno of the second optical system 20 is 2.22, the total effective focal length f of the second optical system 20 is 2.29 mm, the focal length f1 of the first lens of the second optical system 20 is -4.75 mm, the focal length f2 of the second lens of the second optical system 20 is 2.44 mm, the focal length f3 of the third lens of the second optical system 20 is -6.49 mm, the focal length f4 of the fourth lens of the second optical system 20 is 2.31 mm, the focal length f5 of the fifth lens of the second optical system 20 is -6.18 mm, and the focal length f6 of the sixth lens of the second optical system 20 is -5.29 mm.

[0189] Table 11 shows a basic structural parameter table of the virtual reality system of Example 6, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0190]

[0191]

[0192] Table 11

[0193] Table 12 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein each aspherical surface shape can be defined by formula (1) given in the above-mentioned Example 1.

[0194]

[0195] Table 12

[0196] Fig.24 The axial chromatic aberration curve of the second optical system 20 of the virtual reality system of the sixth embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the second optical system 20. Fig.25 The astigmatism curve of the second optical system 20 of the virtual reality system of the sixth embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.26 The distortion curve of the second optical system 20 of the virtual reality system of the sixth embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0197] according to Figure 24 to Figure 26 It can be seen that the second optical system 20 provided in the sixth embodiment can achieve good imaging quality.

[0198] In summary, the virtual reality system provided in the present application can be composed of any one of the first optical systems 10 in the above-mentioned embodiments 1 to 3 and any one of the second optical systems 20 in the above-mentioned embodiments 4 to 6. The first optical system 10 and the second optical system 20 can be combined in pairs to form 9 virtual reality systems. Wherein, referring to Table 13, the virtual reality system corresponding to embodiment combination 1 is composed of the first optical system 10 of embodiment 1 and the second optical system 20 of embodiment 4, the virtual reality system corresponding to embodiment combination 2 is composed of the first optical system 10 of embodiment 1 and the second optical system 20 of embodiment 5, the virtual reality system corresponding to embodiment combination 3 is composed of the first optical system 10 of embodiment 1 and the second optical system 20 of embodiment 6, the virtual reality system corresponding to embodiment combination 4 is composed of the first optical system 10 of embodiment 2 and the second optical system 20 of embodiment 4, the virtual reality system corresponding to embodiment combination 5 is composed of the first optical system 10 of embodiment 2 and the second optical system 20 of embodiment 5, the virtual reality system corresponding to embodiment combination 6 is composed of the first optical system 10 of embodiment 2 and the second optical system 20 of embodiment 6, the virtual reality system corresponding to embodiment combination 7 is composed of the first optical system 10 of embodiment 3 and the second optical system 20 of embodiment 4, the virtual reality system corresponding to embodiment combination 8 is composed of the first optical system 10 of embodiment 3 and the second optical system 20 of embodiment 5, and the virtual reality system corresponding to embodiment combination 9 is composed of the first optical system 10 of embodiment 3 and the second optical system 20 of embodiment 6.

[0199] Conditional / Example Combination 1 2 3 4 5 6 7 8 9 TD' / (T12'+T23') 7.69 10.48 11.17 7.69 10.48 11.17 7.69 10.48 11.17 f1' / f1 -41.27 -43.43 -33.36 -33.05 -34.77 -26.72 -35.38 -37.22 -28.60 FOV / FOV' 1.14 1.14 1.14 1.09 1.09 1.09 1.13 1.13 1.13 (CT1'+CT2') / SD 4.25 3.52 5.16 3.95 3.27 4.80 3.68 3.05 4.47 EPD' / EPD 5.79 5.40 5.40 5.24 4.89 4.89 5.08 4.74 4.74 R4' / f2' -6.44 -5.12 -2.68 -6.44 -5.12 -2.68 -6.44 -5.12 -2.68 f' / f4+f' / f3 6.28 5.88 5.65 5.43 5.08 4.88 5.96 5.58 5.36 f' / f2+f' / f3 6.19 5.80 5.57 5.36 5.02 4.82 5.48 5.13 4.93 TD / CTmax 5.95 5.95 5.95 6.57 6.57 6.57 6.44 6.44 6.44 (f3+f4) / f5 0.95 0.95 0.95 1.13 1.13 1.13 0.68 0.68 0.68 (CT1' / CT2')*(V1' / N1') 35.88 50.56 12.20 35.88 50.56 12.20 35.88 50.56 12.20 R4' / R5' 0.72 0.05 0.63 0.72 0.05 0.63 0.72 0.05 0.63 f' / TD' 1.18 1.42 0.97 1.18 1.42 0.97 1.18 1.42 0.97 SD / ATmax 2.60 2.60 2.60 2.38 2.38 2.38 3.05 3.05 3.05 (R2+R3) / R4 5.17 5.17 5.17 6.30 6.30 6.30 4.54 4.54 4.54 CT4 / T34+CT5 / T45 7.53 7.53 7.53 5.31 5.31 5.31 5.13 5.13 5.13 |f1 / N1| 2.63 2.63 2.63 3.29 3.29 3.29 3.07 3.07 3.07 |f5 / N5| 2.67 2.67 2.67 2.44 2.44 2.44 3.71 3.71 3.71

[0200] Table 13

[0201] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the virtual reality system described above.

[0202] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0203] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0204] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0205] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A virtual reality system, characterized in that: It includes a first optical system and a second optical system that cooperate with each other. Among them, the first optical system sequentially includes a first optical lens group, a second optical lens group, and a third optical lens group along the first optical axis direction. The first optical lens group is composed of a first lens and a reflective polarizing element attached to the first lens. The second optical lens group is composed of a second lens and a quarter-wave plate attached to the second lens. The third optical lens group is composed of a third lens; the second optical system sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the second optical axis; when the effective focal length f2' of the second optical lens group of the first optical system and the effective focal length f' of the first optical system satisfy: |f2'| > |f'|, the axial distance TD' from the first side surface of the first lens of the first optical system to the second side surface of the last lens, the air gap T12' between the first lens and the second lens of the first optical system on the first optical axis, and the air gap T23' between the second lens and the third lens of the first optical system on the first optical axis satisfy: 7 < TD' / (T12' + T23') < 12, and the effective focal length f1' of the first optical lens group of the first optical system and the effective focal length f1 of the first lens of the second optical system satisfy: -44 < f1' / f1 < -26.

2. The virtual reality system according to claim 1, characterized in that: The first optical system has a diaphragm, and the diaphragm is arranged on the first side of the first optical lens group.

3. The virtual reality system according to claim 1, characterized in that: The second optical system has a diaphragm, and the diaphragm is arranged between the first lens and the second lens.

4. The virtual reality system according to claim 1, characterized in that: The maximum field of view angle FOV of the second optical system and the maximum field of view angle FOV' of the first optical system satisfy: 1.0 < FOV / FOV' < 1.

2.

5. The virtual reality system according to claim 1, characterized in that: The entrance pupil diameter EPD' of the first optical system and the entrance pupil diameter EPD of the second optical system satisfy: 4.5 < EPD' / EPD < 6.

0.

6. The virtual reality system according to claim 1, characterized in that: The radius of curvature R4' of the second side surface of the second lens of the second optical lens group and the effective focal length f2' of the second optical lens group of the first optical system satisfy: -6.5 < R4' / f2' < -2.

5.

7. The virtual reality system according to claim 1, characterized in that: The effective focal length f' of the first optical system, the effective focal length f3 of the third lens of the second optical system, and the effective focal length f4 of the fourth lens of the second optical system satisfy: 4.7 < f' / f4 + f' / f3 < 6.

4.

8. The virtual reality system according to claim 1, characterized in that: The effective focal length f' of the first optical system, the effective focal length f2 of the second lens of the second optical system, and the effective focal length f3 of the third lens of the second optical system satisfy: 4.8 < f' / f2 + f' / f3 < 6.

2.

9. The virtual reality system according to any one of claims 1 to 8, characterized in that: The on-axis distance TD from the first side of the first lens of the second optical system to the second side of the last lens satisfies 5.9 < TD / CTmax < 6.6 with respect to the maximum center thickness CTmax of all the lenses of the second optical system on the second optical axis.

10. A virtual reality system, characterized in that: Comprising a mutually cooperating first optical system and a second optical system, wherein, The first optical system sequentially includes a first optical lens group, a second optical lens group, and a third optical lens group along the first optical axis direction. The first optical lens group is composed of a first lens and a reflective polarizing element bonded to the first lens. The second optical lens group is composed of a second lens and a quarter-wave plate bonded to the second lens. The third optical lens group is composed of a third lens; The second optical system sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the second optical axis; When the effective focal length f2' of the second optical lens group of the first optical system and the effective focal length f' of the first optical system satisfy |f2'| > |f'|, the on-axis distance TD' from the first side of the first lens of the first optical system to the second side of the last lens, the air gap T12' between the first lens and the second lens of the first optical system on the first optical axis, and the air gap T23' between the second lens and the third lens of the first optical system on the first optical axis satisfy 7 < TD' / (T12' + T23') < 12, and the maximum field of view FOV of the second optical system and the maximum field of view FOV' of the first optical system satisfy 1.0 < FOV / FOV' < 1.2.

Images