Virtual reality device

Abstract

A virtual reality device disclosed by the present application comprises a first optical system and a second optical system, the first optical system comprises a first lens, a reflective polarizing element, a quarter-wave plate, a second lens and a third lens, and the second side surface of the third lens is a convex surface; the second optical system comprises a first lens, a second lens, a third lens, a fourth lens and an eighth lens, the first lens has negative focal power, the object side of the first lens is a convex surface, the image side of the first lens is a concave surface, the second lens has negative focal power, the image side of the second lens is a concave surface, the third lens has positive focal power, the fourth lens has positive focal power, the image side of the fourth lens is a convex surface, and the object side of the fifth lens is a convex surface; the sixth lens has negative focal power and the object side is a concave surface; the seventh lens has positive focal power and the object side is a convex surface and the image side is a convex surface; a real image formed by the second optical system is transmitted to the display screen in the form of an electric signal, and the first optical system is used for projecting a virtual image on the display screen and the real image transmitted to the display screen. The entrance pupil diameters EPDA and EPDB of the first optical system and the second optical system satisfy 3.5 lt; ePDA / EPDBlt; 4.8).

Description

Technical Field

[0001] The present application relates to the field of optical devices, and in particular to a virtual reality device. Background Art

[0002] With the development of virtual reality technology, more and more lenses are used in various devices of virtual reality technology, including eyepieces that provide immersion, perspective lenses that interact with reality, positioning lenses that capture movements, facial recognition lenses that build expressions, etc. Different from simple projection functions, the combination of accurate recognition and interaction functions can make virtual reality devices truly transition from novel toys to consumer-level entertainment and even practical equipment.

[0003] However, due to the limitations of how the virtual reality device is worn and used, it is difficult to increase the size of the entire device, resulting in limited space for the eyepiece and the positioning lens. Therefore, how to balance the projection quality of the eyepiece and the spatial reading capability of the positioning lens with the miniaturized design of its own size, while ensuring the lightweight of the product without losing the optical effectiveness of the product, so that the product has actual production usability and further improves the user experience, is one of the technical problems that technical personnel in this field are committed to solving. Utility Model Content

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

[0005] The present application provides a virtual reality device, which may include a first optical system and a second optical system. The first optical system sequentially includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens along a first optical axis from a first side to a second side. Among them, the first lens has a positive or negative optical power; the second lens has a positive or negative optical power; the third lens has a positive or negative optical power, and its second side is convex. The second optical system sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens along a second optical axis from an object side to an image side. Among them, the first lens has a negative optical power, its object side is convex, and its image side is concave; the second lens has a negative optical power, and its image side is concave; the third lens has a positive optical power; the fourth lens has a positive optical power, and its image side is convex; the fifth lens has a positive or negative optical power, and its object side is convex; the sixth lens has a negative optical power, and its object side is concave; the seventh lens has a positive optical power, its object side is convex, and its image side is convex; the eighth lens has a positive or negative optical power. The real image formed by the second optical system is transmitted to a display screen in the form of an electrical signal, and the first optical system is used to project a virtual image on the display screen and transmit the real image transmitted to the display screen. The virtual reality device can satisfy: 3.5 < EPDA / EPDB < 4.8, where EPDA is the entrance pupil diameter of the first optical system, and EPDB is the entrance pupil diameter of the second optical system.

[0006] According to an exemplary embodiment of the present application, the distance TDB on the second optical axis from the object side of the first lens to the image side of the eighth lens and the distance TDA on the first optical axis from the first side of the first lens to the second side of the third lens may satisfy: 0.4 < TDB / TDA < 1.4.

[0007] According to an exemplary embodiment of the present application, the combined focal length f23A of the second lens and the third lens, the central thickness CT2A of the second lens on the first optical axis, and the central thickness CT3A of the third lens on the first optical axis may satisfy: 8.6 < f23A / (CT2A + CT3A) < 16.2.

[0008] According to an exemplary embodiment of the present application, the effective focal length f3A of the third lens and the effective focal length f1A of the first lens may satisfy: 0.4 < f3A / f1A < 1.7.

[0009] According to an exemplary embodiment of the present application, a radius of curvature R6A of the second side surface of the third lens and a radius of curvature R5A of the first side surface of the third lens may satisfy: 0.2<|R6A / R5A|<1.4.

[0010] According to an exemplary embodiment of the present application, the center thickness CT1A of the first lens on the first optical axis, the center thickness CTRA of the reflective polarizing element on the first optical axis, the center thickness CTQA of the quarter-wave plate on the first optical axis, and the distance TDA from the first side surface of the first lens to the second side surface of the third lens on the first optical axis may satisfy: 0.1<(CT1A+CTRA+CTQA) / TDA<0.4.

[0011] According to an exemplary embodiment of the present application, the effective focal length f1B of the first lens, the effective focal length f2B of the second lens, and the effective focal length f3B of the third lens may satisfy: -2.6 <f1B / (f2B+f3B)<-1.1。

[0012] According to an exemplary embodiment of the present application, the effective focal length f4B of the fourth lens and the curvature radius R8B of the image side surface of the fourth lens may satisfy: -2.1 <f4B / R8B<-1.0。

[0013] According to an exemplary embodiment of the present application, the effective focal length f8B of the eighth lens and the effective focal length f5B of the fifth lens may satisfy: 1.1 <f8B / f5B<1.6。

[0014] According to an exemplary embodiment of the present application, the center thickness CT5B of the fifth lens on the second optical axis, the center thickness CT6B of the sixth lens on the second optical axis, the center thickness CT7B of the seventh lens on the second optical axis, the center thickness CT2B of the second lens on the second optical axis and the center thickness CT3B of the third lens on the second optical axis may satisfy: 2.1<(CT5B+CT6B+CT7B) / (CT2B+CT3B)<3.3.

[0015] According to an exemplary embodiment of the present application, the sum ∑CTB of the center thickness of each lens from the first lens to the eighth lens on the second optical axis and the air gap T12B between the first lens and the second lens on the second optical axis may satisfy: 3.1<∑CTB / T12B<3.4.

[0016] According to an exemplary embodiment of the present application, the effective focal length f7B of the seventh lens and the central thickness CT7B of the seventh lens on the second optical axis may satisfy: 1.1 < f7B / CT7B < 4.8.

[0017] According to an exemplary embodiment of the present application, the effective focal length fB of the second optical system may satisfy: 1.0 < fB / EPDB < 1.4.

[0018] According to an exemplary embodiment of the present application, the radius of curvature R1B of the object side surface of the first lens and the radius of curvature R1A of the first side surface of the first lens may satisfy: -0.6 < R1B / R1A < 0.2.

[0019] On the other hand, the present application also provides a virtual reality device, which may include a first optical system and a second optical system. The first optical system sequentially includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens along a first optical axis from a first side to a second side. Among them, the first lens has a positive or negative optical power; the second lens has a positive or negative optical power; the third lens has a positive optical power, and its second side surface is convex; the second optical system sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens along a second optical axis from an object side to an image side. Among them, the first lens has a negative optical power, its object side surface is convex, and its image side surface is concave; the second lens has a negative optical power, and its image side surface is concave; the third lens has a positive optical power; the fourth lens has a positive optical power, and its image side surface is convex; the fifth lens has a positive or negative optical power, and its object side surface is convex; the sixth lens has a negative optical power, and its object side surface is concave; the seventh lens has a positive optical power, its object side surface is convex, and its image side surface is convex; the eighth lens has a positive or negative optical power. The real image formed by the second optical system is transmitted to the display screen in the form of an electrical signal, and the first optical system is used to project the virtual image on the display screen and the real image transmitted to the display screen. The virtual reality device may satisfy: 9.6 < fA / fB < 20.9, where fA is the effective focal length of the first optical system and fB is the effective focal length of the second optical system.

[0020] According to an exemplary embodiment of the present application, the distance TDB on the second optical axis from the object side surface of the first lens to the image side surface of the eighth lens and the distance TDA on the first optical axis from the first side surface of the first lens to the second side surface of the third lens may satisfy: 0.4 < TDB / TDA < 1.4.

[0021] According to an exemplary embodiment of the present application, the combined focal length f23A of the second lens and the third lens, the center thickness CT2A of the second lens on the first optical axis, and the center thickness CT3A of the third lens on the first optical axis may satisfy: 8.6 <f23A / (CT2A+CT3A)<16.2。

[0022] According to an exemplary embodiment of the present application, the effective focal length f3A of the third lens and the effective focal length f1A of the first lens may satisfy: 0.4 <f3A / f1A<1.7。

[0023] According to an exemplary embodiment of the present application, a radius of curvature R6A of the second side surface of the third lens and a radius of curvature R5A of the first side surface of the third lens may satisfy: 0.2<|R6A / R5A|<1.4.

[0024] According to an exemplary embodiment of the present application, the center thickness CT1A of the first lens on the first optical axis, the center thickness CTRA of the reflective polarizing element on the first optical axis, the center thickness CTQA of the quarter-wave plate on the first optical axis, and the distance TDA from the first side surface of the first lens to the second side surface of the third lens on the first optical axis may satisfy: 0.1<(CT1A+CTRA+CTQA) / TDA<0.4.

[0025] According to an exemplary embodiment of the present application, the effective focal length f1B of the first lens, the effective focal length f2B of the second lens, and the effective focal length f3B of the third lens may satisfy: -2.6 <f1B / (f2B+f3B)<-1.1。

[0026] According to an exemplary embodiment of the present application, the effective focal length f4B of the fourth lens and the curvature radius R8B of the image side surface of the fourth lens may satisfy: -2.1 <f4B / R8B<-1.0。

[0027] According to an exemplary embodiment of the present application, the effective focal length f8B of the eighth lens and the effective focal length f5B of the fifth lens may satisfy: 1.1 <f8B / f5B<1.6。

[0028] According to an exemplary embodiment of the present application, the center thickness CT5B of the fifth lens on the second optical axis, the center thickness CT6B of the sixth lens on the second optical axis, the center thickness CT7B of the seventh lens on the second optical axis, the center thickness CT2B of the second lens on the second optical axis and the center thickness CT3B of the third lens on the second optical axis may satisfy: 2.1<(CT5B+CT6B+CT7B) / (CT2B+CT3B)<3.3.

[0029] According to an exemplary embodiment of the present application, the sum ∑CTB of the center thickness of each lens from the first lens to the eighth lens on the second optical axis and the air gap T12B between the first lens and the second lens on the second optical axis may satisfy: 3.1<∑CTB / T12B<3.4.

[0030] According to an exemplary embodiment of the present application, the effective focal length f7B of the seventh lens and the center thickness CT7B of the seventh lens on the second optical axis may satisfy: 1.1 <f7B / CT7B<4.8。

[0031] According to an exemplary embodiment of the present application, the effective focal length fB of the second optical system may satisfy: 1.0 <fB / EPDB<1.4。

[0032] According to an exemplary embodiment of the present application, the curvature radius R1B of the object side surface of the first lens and the curvature radius R1A of the first side surface of the first lens may satisfy: -0.6 <R1B / R1A<0.2。

[0033] The virtual reality device provided by the present application includes a first optical system and a second optical system. Among them, the first optical system includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens arranged in sequence along a first optical axis from a first side to a second side. The first lens to the third lens respectively have a positive or negative optical power, and the second side surface of the third lens is a convex surface. The second optical system includes a first to an eighth lens arranged in sequence along a second optical axis from an object side to an image side. Among them, the first lens has a negative optical power, its object side surface is a convex surface, and its image side surface is a concave surface. The second lens has a negative optical power, and its image side surface is a concave surface. The third lens has a positive optical power. The fourth lens has a positive optical power, and its image side surface is a convex surface. The fifth lens has a positive or negative optical power, and its object side surface is a convex surface. The sixth lens has a negative optical power, and its object side surface is a concave surface. The seventh lens has a positive optical power, its object side surface is a convex surface, and its image side surface is a convex surface. The eighth lens has a positive or negative optical power. The real image formed by the second optical system can be transmitted to the display screen in the form of an electrical signal. The first optical system can be used to project the virtual image on the display screen and the real image formed by the second optical system transmitted to the display screen. By reasonably setting the infrastructure of the first optical system and the second optical system, and controlling the ratio of the entrance pupil diameter EPDA of the first optical system to the entrance pupil diameter EPDB of the second optical system to satisfy 3.5 < EPDA / EPDB < 4.8, the entrance pupil diameter of the first system is larger and the entrance pupil diameter of the second system is smaller, which can help ensure the light transmission amount of the eyepiece, avoid the projected image entering the human eye after polarization transmission being too dark and affecting the visual experience. At the same time, the small aperture design of the positioning lens is initially confirmed to obtain a deeper depth of field effect, retain more captured details, facilitate shooting in a low-light environment, and avoid affecting the positioning accuracy due to too low ambient brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In combination with the drawings, through the detailed description of the following embodiments, other features, objectives, and advantages of the present application will become more obvious. In the drawings:

[0035] Figure 1 A schematic plan view of the virtual reality device according to the present application is shown;

[0036] Figure 2 A schematic three-dimensional view (front view) of the virtual reality device according to the present application is shown;

[0037] Figure 3 A schematic three-dimensional view (rear view) of the virtual reality device according to the present application is shown;

[0038] Figure 4 A schematic structural view of the first optical system according to Embodiment 1 of the present application is shown;

[0039] Figure 5 、 Figure 6 and Figure 7 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system according to Example 1 of the present application are respectively shown;

[0040] Figure 8 A schematic structural diagram of a first optical system according to Embodiment 2 of the present application is shown;

[0041] Fig. 9 , Fig.10 and Fig.11 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system according to Embodiment 2 of the present application are respectively shown;

[0042] Fig.12 A schematic structural diagram of a first optical system according to Embodiment 3 of the present application is shown;

[0043] Fig.13 , Fig.14 and Fig.15 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system according to Example 3 of the present application are respectively shown;

[0044] Fig.16 A schematic structural diagram of a first optical system according to Embodiment 4 of the present application is shown;

[0045] Fig.17 , Fig.18 and Fig.19 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system according to Example 4 of the present application are respectively shown;

[0046] Fig. 20 A schematic structural diagram of a second optical system according to Embodiment 5 of the present application is shown;

[0047] Fig.21 and Fig. 22 The axial chromatic aberration curve and the astigmatism curve of the second optical system according to the fifth embodiment of the present application are respectively shown;

[0048] Fig.23 A schematic structural diagram of a second optical system according to Embodiment 6 of the present application is shown;

[0049] Fig.24 and Fig.25 The axial chromatic aberration curve and the astigmatism curve of the second optical system according to the sixth embodiment of the present application are respectively shown;

[0050] Fig.26 shows a schematic structural diagram of a second optical system according to Embodiment 7 of the present application; and

[0051] Fig. 27 and Fig.28The axial chromatic aberration curve and the astigmatism curve of the second optical system according to the seventh embodiment of the present application are respectively shown. DETAILED DESCRIPTION

[0052] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0053] 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.

[0054] In the drawings, the thickness, size and shape of the lenses and / or mirrors 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.

[0055] In this article, the paraxial area refers to the area near the optical axis. If the surface of the lens and / or the lens is convex and the position of the convex surface is not defined, it means that the surface of the lens and / or the lens is convex at least in the paraxial area; if the surface of the lens and / or the lens is concave and the position of the concave surface is not defined, it means that the surface of the lens and / or the lens is concave at least in the paraxial area. The surface of each lens closest to the first side (such as the human eye side) is called the first side of the lens, and the surface of each lens closest to the second side (such as the display screen side) is called the second side of the lens. The surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens.

[0056] It should also be understood that the terms "include", "comprising", "having", "including" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when describing embodiments of the present application, the term "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0057] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0058] 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 application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0059] The features, principles and other aspects of the present application are described in detail below.

[0060] refer to Figure 1 The present application provides such a virtual reality device 10, which may include a first optical system 100 and a second optical system 200. The second optical system 200 is used, for example, to image a real scene, and the real image formed can be transmitted to the display screen of the virtual reality device 10 in the form of an electrical signal. The first optical system 100 can be used to project a virtual image on the display screen and the real image formed by the second optical system 200 transmitted to the display screen. Exemplarily, the display screen can be arranged on the second side of the first optical system 100. By combining the first optical system 100 and the second optical system 200, the virtual reality fusion of the virtual reality device can be achieved. The first optical system 100 can be configured as a catadioptric optical system, the number of which can be one or more, and the second optical system 200 can be configured as a transmissive optical system, the number of which can be one or more. In one example, the virtual reality device 10 may include two first optical systems 100 arranged symmetrically. In one example, the virtual reality device 10 also includes a body, the first optical system 100 can be arranged on the inner side of the body, and the second optical system 200 can be arranged on the outer side of the body.

[0061] In an exemplary embodiment, the first optical system may include a first lens, a reflective polarizing element, a quarter wave plate, a second lens, and a third lens arranged in sequence from the first side to the second side along the first optical axis.

[0062] In an exemplary embodiment, the first lens may have positive power or negative power. The second lens may have positive power or negative power. The third lens may have positive power or negative power, and the second side surface of the third lens may be a convex surface.

[0063] In an exemplary embodiment, the first side may be a human eye side, and the second side may be a display screen side. Accordingly, the first side of each element such as the first lens, the reflective polarizing element, the quarter wave plate, the second lens, and the third lens may also be referred to as a side near the human eye, and the second side may also be referred to as a side near the screen.

[0064] In an exemplary embodiment, the first optical system may further include a partial reflective element, which may be disposed, for example, on the second side of the third lens. The partial reflective element has a semi-transmissive and semi-reflective effect on the light. By arranging the partial reflective element on, for example, the second side of the third lens, and combining the arrangement of a reflective polarizing element and a quarter-wave plate, etc., the light can be refracted multiple times in the first optical system, effectively reducing the main body length of the first optical system.

[0065] In an exemplary embodiment, the first optical system may further include an aperture, which may be disposed, for example, between the first side (the human eye side) and the first lens. The image light on the display screen may be projected to the user's eyes after multiple refractions and reflections through the third lens, the second lens, the quarter-wave plate, the reflective polarizing element, and the first lens.

[0066] See also Figure 4 In an exemplary embodiment, a display screen (IMG) is provided on the second side of the first optical system 100, and the image light from the display screen can sequentially pass through the partial reflection element BS, the third lens E3', the second lens E2' and the quarter wave plate QWP to reach the reflective polarizing element RP, and then reflect at the reflective polarizing element RP to form the first reflected image light. The first reflected image light then sequentially passes through the quarter wave plate QWP, the second lens E2', the third lens E3' and reaches the partial reflection element BS, and then reflects at the partial reflection element BS to form the second reflected image light. The second reflected image light then sequentially passes through the third lens E3', the second lens E2', the quarter wave plate QWP, the reflective polarizing element RP and the first lens E1' to the aperture STO' and is finally projected into the eyes of the user. In other examples, the order in which the image light, the first reflected image light and the second reflected image light pass through each element can be adjusted as needed. The first optical system provided in the present application folds the required optical path without affecting the projection quality by combining light reflection and refraction, effectively shortening the main body length of the first optical system.

[0067] In an exemplary embodiment, the second optical system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in order from the object side to the image side along the second optical axis.

[0068] In an exemplary embodiment, the first lens may have a negative optical power. The object side of the first lens may be convex, and the image side may be concave. The second lens may have a negative optical power. The image side of the second lens may be concave. The third lens may have a positive optical power. The fourth lens may have a positive optical power. The image side of the fourth lens may be convex. The fifth lens may have a positive or negative optical power. The object side of the fifth lens may be convex. The sixth lens may have a negative optical power. The object side of the sixth lens may be concave. The seventh lens may have a positive optical power. The object side of the seventh lens may be convex, and the image side may be convex. The eighth lens may have a positive or negative optical power.

[0069] The first optical system in this application is used to transfer the virtual image / virtual reality image of the display screen to the user's eyes, which can give the user a virtual immersion feeling. The second optical system can be used to image real scenes, and transfer the formed real image to the display screen through a chip such as the second optical system. Then, the first optical system transfers the real image on the display screen to the user. By projecting the virtual image on the display screen and the real image formed by the second optical system, the spatial limitation of virtual reality can be broken through, realizing the interaction between the real world and the virtual world of the virtual device, enabling the user to view the image after the fusion of the virtual picture and the real scene, and improving the visual immersion of the virtual reality device.

[0070] In an exemplary embodiment, the virtual reality device of this application may satisfy the condition 3.5 < EPDA / EPDB < 4.8, where EPDA is the entrance pupil diameter of the first optical system, and EPDB is the entrance pupil diameter of the second optical system.

[0071] The virtual reality device according to an exemplary embodiment of the present application includes a first optical system and a second optical system. Among them, the first optical system includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens arranged in sequence from the first side to the second side along a first optical axis. The first lens to the third lens respectively have a positive or negative optical power, and the second side surface of the third lens is a convex surface; the second optical system includes the first to eighth lenses arranged in sequence from the object side to the image side along a second optical axis. Among them, the first lens has a negative optical power, its object side surface is a convex surface, and its image side surface is a concave surface; the second lens has a negative optical power and its image side surface is a concave surface; the third lens has a positive optical power; the fourth lens has a positive optical power and its image side surface is a convex surface; the fifth lens has a positive or negative optical power and its object side surface is a convex surface; the sixth lens has a negative optical power and its object side surface is a concave surface; the seventh lens has a positive optical power, its object side surface is a convex surface, and its image side surface is a convex surface; the eighth lens has a positive or negative optical power. The real image formed by the second optical system can be transmitted to the display screen in the form of an electrical signal. The first optical system can be used to project the virtual image on the display screen and the real image formed by the second optical system transmitted to the display screen. By reasonably setting the infrastructure of the first optical system and the second optical system, and controlling the ratio of the entrance pupil diameter EPDA of the first optical system to the entrance pupil diameter EPDB of the second optical system to satisfy 3.5 < EPDA / EPDB < 4.8, the entrance pupil diameter of the first system is larger and the entrance pupil diameter of the second system is smaller, which is beneficial to ensuring the light transmission amount of the eyepiece, avoiding the projection image entering the human eye after polarization transmission from being too dark and affecting the visual experience. At the same time, the small aperture design of the positioning lens is initially confirmed to obtain a deeper depth-of-field effect, retain more captured details, facilitate use in low-light environments, and avoid affecting the positioning accuracy due to too low ambient brightness.

[0072] In an exemplary embodiment, the virtual reality device of the present application can satisfy the condition 9.6 < fA / fB < 20.9, where fA is the effective focal length of the first optical system and fB is the effective focal length of the second optical system.

[0073] The virtual reality device according to an exemplary embodiment of the present application includes a first optical system and a second optical system. Among them, the first optical system includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens arranged in sequence from the first side to the second side along the first optical axis. The first lens to the third lens respectively have a positive optical power or a negative optical power, and the second side surface of the third lens is a convex surface; the second optical system includes the first to eighth lenses arranged in sequence from the object side to the image side along the second optical axis. Among them, the first lens has a negative optical power, its object side surface is a convex surface, and its image side surface is a concave surface; the second lens has a negative optical power and its image side surface is a concave surface; the third lens has a positive optical power; the fourth lens has a positive optical power and its image side surface is a convex surface; the fifth lens has a positive optical power or a negative optical power and its object side surface is a convex surface; the sixth lens has a negative optical power and its object side surface is a concave surface; the seventh lens has a positive optical power, its object side surface is a convex surface, and its image side surface is a convex surface; the eighth lens has a positive optical power or a negative optical power. The real image formed by the second optical system can be transmitted to the display screen in the form of an electrical signal. The first optical system can be used to project the virtual image on the display screen and the real image formed by the second optical system transmitted to the display screen. By reasonably setting the infrastructure of the first optical system and the second optical system, and controlling the effective focal length fA of the first optical system and the effective focal length fB of the second optical system to satisfy the conditional formula 9.6 < fA / fB < 20.9, and reasonably allocating and connecting the main values of the two, it is beneficial to coordinate the processing of the optical-related positioning and projection information obtained by the system, and avoid the influence of the positioning and projection display position differences on the functionality of the whole machine; at the same time, it is convenient to preset the ratio of the field of view angle and the total optical length of each system, which is beneficial to the further optimization design of each component in the future.

[0074] In an exemplary embodiment, the virtual reality device of the present application can satisfy the conditional formula 0.4 < TDB / TDA < 1.4, where TDB is the distance on the second optical axis from the object side surface of the first lens to the image side surface of the eighth lens in the second optical system, and TDA is the distance on the first optical axis from the first side surface of the first lens to the second side surface of the third lens in the first optical system. By controlling the virtual reality device to satisfy the conditional formula 0.4 < TDB / TDA < 1.4, the dimensional ratio relationship between the first optical system and the second optical system in the direction along their respective optical axes can be initially confirmed, which is convenient for the preliminary reservation of the axial dimensions of each lens module in the whole machine space.

[0075] In an exemplary embodiment, the virtual reality device of the present application can satisfy the conditional formula 8.6 < f23A / (CT2A + CT3A) < 16.2, where f23A is the combined focal length of the second lens and the third lens in the first optical system, CT2A is the central thickness of the second lens on the first optical axis in the first optical system, and CT3A is the central thickness of the third lens on the first optical axis in the first optical system. By reasonably controlling the ratio of the combined focal length of the second and third lenses in the first optical system to the sum of the central thicknesses of the second and third lenses within this range, the central thicknesses of the two can be reasonably allocated at a certain focal length, which is beneficial to ensuring the central strength of the two, increasing the actual processing feasibility, and ensuring the assembly strength.

[0076] In an exemplary embodiment, the virtual reality device of the present application can satisfy the conditional formula 0.4 < f3A / f1A < 1.7, where f3A is the effective focal length of the third lens in the first optical system, and f1A is the effective focal length of the first lens in the first optical system. By controlling the ratio of the effective focal length of the third lens to the effective focal length of the first lens in the first optical system within this range, it is convenient to control the light rays entering and exiting the pupil of the eyepiece, which indirectly facilitates the control of the screen position and the exit pupil distance, and is convenient for the compact design of the eyepiece module.

[0077] In an exemplary embodiment, the virtual reality device of the present application can satisfy the conditional formula 0.2 < |R6A / R5A| < 1.4, where R6A is the radius of curvature of the second side surface of the third lens in the first optical system, and R5A is the radius of curvature of the first side surface of the third lens in the first optical system. By controlling the ratio of the radius of curvature of the second side surface of the third lens to the radius of curvature of the first side surface in the first optical system to satisfy the conditional formula 0.2 < |R6A / R5A| < 1.4, it is beneficial to standardize the shape and refractive power of the third lens, and the second side surface shape of the third lens is convex, which is convenient for converging the light rays emitted by the screen, and indirectly facilitates restricting the selection of the screen size.

[0078] In an exemplary embodiment, the virtual reality device of the present application can satisfy the conditional formula 0.1 < (CT1A + CTR A + CTQ A) / TDA < 0.4, where CT1A is the central thickness of the first lens on the first optical axis in the first optical system, CTR A is the central thickness of the reflective polarizing element on the first optical axis in the first optical system, CTQ A is the central thickness of the quarter-wave plate on the first optical axis in the first optical system, and TDA is the distance on the first optical axis from the first side surface of the first lens to the second side surface of the third lens in the first optical system. By controlling the virtual reality device to satisfy the conditional formula 0.1 < (CT1A + CTR A + CTQ A) / TDA < 0.4, the proportion of the reflective optical path in the total transmission optical path in the eyepiece system can be fed back. A relatively high proportion of the refractive and reflective optical paths leaves room for aberration optimization, and is beneficial to compressing the total optical length.

[0079] In an exemplary embodiment, the virtual reality device of the present application may satisfy the conditional formula -2.6 < f1B / (f2B + f3B) < -1.1, where f1B is the effective focal length of the first lens in the second optical system, f2B is the effective focal length of the second lens in the second optical system, and f3B is the effective focal length of the third lens in the second optical system. By controlling the ratio of the effective focal length of the first lens in the second optical system to the sum of the effective focal lengths of the second and third lenses within this range, it is beneficial to the focal length distribution of the first, second, and third lenses, thereby indirectly controlling the dimensions of elements such as curvature and center thickness, and facilitating the positioning lens to receive and transmit incident light.

[0080] In an exemplary embodiment, the virtual reality device of the present application may satisfy the conditional formula -2.1 < f4B / R8B < -1.0, where f4B is the effective focal length of the fourth lens in the second optical system, and R8B is the radius of curvature of the image side surface of the fourth lens in the second optical system. By controlling the ratio of the effective focal length of the fourth lens in the second optical system to the radius of curvature of its image side surface, making it have a positive refractive power and the image side surface being convex, it is beneficial to make the converging light diverge again, facilitating subsequent aberration optimization to improve the optical positioning accuracy.

[0081] In an exemplary embodiment, the virtual reality device of the present application may satisfy the conditional formula 1.1 < f8B / f5B < 1.6, where f8B is the effective focal length of the eighth lens in the second optical system, and f5B is the effective focal length of the fifth lens in the second optical system. By controlling the ratio of the effective focal lengths of the eighth and fifth lenses in the second optical system within this range, it is beneficial to the connection of the main values in the middle and later sections of the positioning lens, facilitating the reasonable transmission of light to the receiving image plane and avoiding a large vignetting resulting in a reduction in the image brightness.

[0082] In an exemplary embodiment, the virtual reality device of the present application may satisfy the conditional formula 2.1 < (CT5B + CT6B + CT7B) / (CT2B + CT3B) < 3.3, where CT5B is the central thickness of the fifth lens in the second optical system on the second optical axis, CT6B is the central thickness of the sixth lens in the second optical system on the second optical axis, CT7B is the central thickness of the seventh lens in the second optical system on the second optical axis, CT2B is the central thickness of the second lens in the second optical system on the second optical axis, and CT3B is the central thickness of the third lens in the second optical system on the second optical axis. By controlling the ratio of the sum of the central thicknesses of the fifth, sixth, and seventh lenses in the second optical system to the sum of the central thicknesses of the second and third lenses within this range, making the former smaller and the latter larger, a relatively sufficient adjustment space is reserved for aberrations introduced by wide-angle capturing of positioning images, facilitating the front and rear lens groups to further optimize aberrations through reasonable central thickness design and distribution, and improving the positioning quality.

[0083] In an exemplary embodiment, the virtual reality device of the present application can satisfy the conditional formula 3.1 < ∑CTB / T12B < 3.4, where ∑CTB is the sum of the central thicknesses of each of the first to eighth lenses on the second optical axis in the second optical system, and T12B is the air gap between the first lens and the second lens on the second optical axis in the second optical system. By controlling the virtual reality device to satisfy the conditional formula 3.1 < ∑CTB / T12B < 3.4, on the one hand, it is beneficial to ensure the assembly interval between the first and second lenses and avoid actual assembly problems such as interference. On the other hand, it is beneficial to restrict the ratio of the total length to the gap and facilitate the control of the length of the eyepiece module.

[0084] In an exemplary embodiment, the virtual reality device of the present application can satisfy the conditional formula 1.1 < f7B / CT7B < 4.8, where f7B is the effective focal length of the seventh lens in the second optical system, and CT7B is the central thickness of the seventh lens on the second optical axis in the second optical system. By controlling the ratio of the effective focal length to the central thickness of the seventh lens in the second optical system within this range, it is beneficial to further restrict the surface shape on the basis of ensuring its assembly strength and facilitate the distribution of diopter.

[0085] In an exemplary embodiment, the virtual reality device of the present application can satisfy the conditional formula 1.0 < fB / EPDB < 1.4, where fB is the effective focal length of the second optical system, and EPDB is the entrance pupil diameter of the second optical system. By controlling the ratio of the effective focal length to the entrance pupil diameter of the second optical system within this range, it is beneficial to control the aperture size of the positioning lens, enable it to have the ability to recognize and capture scenes in a low-light environment, and facilitate the positioning lens to achieve high-precision positioning functions in different environmental scenarios.

[0086] In an exemplary embodiment, the virtual reality device of the present application can satisfy the conditional formula -0.6 < R1B / R1A < 0.2, where R1B is the curvature radius of the object side surface of the first lens in the second optical system, and R1A is the curvature radius of the first side surface of the first lens in the first optical system. By controlling the ratio of the curvature radius of the object side surface of the first lens in the second optical system to the curvature radius of the first side surface of the first lens in the first optical system within this range, the surface shapes of the front surface of the positioning lens and the entrance pupil surface of the eyepiece can be restricted, thereby controlling the transmission direction of light on its surface, which is beneficial to the coordinated processing of ambient light and entrance pupil light by the whole machine device.

[0087] The virtual reality device according to the above-mentioned embodiment of the present application includes a first optical system and a second optical system, wherein the first optical system may use multiple lenses, such as the three lenses described above, and the second optical system may use multiple lenses, such as the eight lenses described above. By reasonably configuring the parameters of the first optical system and the second optical system, the system performance can be improved, and the imaging quality and visual immersion of the virtual reality device can be improved. The first optical system (eyepiece) and the second optical system (positioning lens) are matched together to enhance the positioning function of, for example, a handle, which can greatly improve the user experience. And the virtual reality device configured as above has the characteristics of miniaturization and good imaging quality, which can well meet the use requirements of various portable electronic products in projection scenes.

[0088] In an embodiment of the present application, the first to third lenses of the first optical system and the first to eighth lenses of the second optical system may include lenses or lenses having aspherical mirror surfaces. The characteristic of aspherical lenses or lenses is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike spherical lenses with a constant curvature from the center of the lens to the periphery of the lens, aspherical lenses have better curvature radius characteristics and have the advantages of improving distortion aberration and improving astigmatism aberration. After adopting aspherical lenses, the aberrations that occur during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0089] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses and / or mirrors constituting the optical system can be changed to obtain the various results and advantages described in this specification.

[0090] On one hand, the present application provides a virtual reality device, which includes a first optical system and a second optical system, wherein the first optical system includes a first lens, a reflective polarizing element, a quarter wave plate, a second lens and a third lens arranged in sequence from the first side to the second side along a first optical axis, the first lens to the third lens have positive optical power or negative optical power respectively, and the second side surface of the third lens is a convex surface; the second optical system includes first to eighth lenses arranged in sequence from the object side to the image side along the second optical axis, wherein the first lens has negative optical power and its object side surface is convex and its image side surface is concave, the second lens has negative optical power and its image side surface is concave, the third lens has positive optical power, the fourth lens has positive optical power and its image side surface is convex, the fifth lens has positive optical power or negative optical power and its object side surface is convex, the sixth lens has negative optical power and its object side surface is concave, the seventh lens has positive optical power and its object side surface is convex and its image side surface is convex, and the eighth lens has positive optical power or negative optical power.

[0091] The real image formed by the second optical system can be transmitted to the display screen in the form of an electrical signal. The first optical system can be used to project the virtual image on the display screen and the real image formed by the second optical system transmitted to the display screen. By reasonably setting the infrastructure of the first optical system and the second optical system, and at the same time controlling the ratio of the entrance pupil diameter EPDA of the first optical system to the entrance pupil diameter EPDB of the second optical system to satisfy 3.5 < EPDA / EPDB < 4.8, making the entrance pupil diameter of the first system larger and the entrance pupil diameter of the second system smaller, it is beneficial to ensure the light passing amount of the eyepiece, avoid the projected image entering the human eye being too dark after polarization transmission, which affects the visual experience, and at the same time initially confirm the small aperture design of the positioning lens to obtain a deeper depth of field effect, retain more captured details, facilitate use in low-light environments, and avoid affecting the positioning accuracy due to too low ambient brightness.

[0092] On the other hand, the present application provides such a virtual reality device, which includes a first optical system and a second optical system. Among them, the first optical system includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens arranged in sequence along the first optical axis from the first side to the second side. The first lens to the third lens respectively have a positive optical power or a negative optical power, and the second side surface of the third lens is a convex surface; the second optical system includes the first to eighth lenses arranged in sequence along the second optical axis from the object side to the image side. Among them, the first lens has a negative optical power and its object side surface is a convex surface and its image side surface is a concave surface, the second lens has a negative optical power and its image side surface is a concave surface, the third lens has a positive optical power, the fourth lens has a positive optical power and its image side surface is a convex surface, the fifth lens has a positive optical power or a negative optical power and its object side surface is a convex surface, the sixth lens has a negative optical power and its object side surface is a concave surface, the seventh lens has a positive optical power and its object side surface is a convex surface and its image side surface is a convex surface, and the eighth lens has a positive optical power or a negative optical power.

[0093] The real image formed by the second optical system can be transmitted to the display screen in the form of an electrical signal. The first optical system can be used to project the virtual image on the display screen and the real image formed by the second optical system transmitted to the display screen. By reasonably setting the infrastructure of the first optical system and the second optical system, and at the same time controlling the effective focal length fA of the first optical system and the effective focal length fB of the second optical system to satisfy the conditional formula 9.6 < fA / fB < 20.9, reasonably distributing and connecting the main values of the two, it is beneficial to coordinate the processing of the optical-related positioning and projection information obtained by the system, and avoid the difference in the positioning and projection display positions affecting the functionality of the whole machine; at the same time, it is convenient to preset the ratio of the field of view angle and the total optical length of each system, which is beneficial to further optimize the design of each component later.

[0094] The following further describes specific embodiments of the first optical system applicable to the above embodiments with reference to the accompanying drawings.

[0095] Example 1

[0096] The following reference Figure 4 The first optical system according to Example 1 of the present application is described.

[0097] like Figure 4 As shown, the first optical system 100 includes a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2', a third lens E3' and a partial reflective element BS arranged in sequence from the first side to the second side along the first optical axis, wherein the first side surface of the reflective polarizing element RP is attached to the second side surface of the first lens E1', the first side surface of the quarter wave plate QWP is attached to the second side surface of the reflective polarizing element RP; and the partial reflective element BS is disposed on the second side surface of the third lens E3'. In this embodiment, a stop STO' is further disposed on the first side of the first optical system 100, and an image surface IMG is disposed on the second side.

[0098] In this embodiment, the first side may be the human eye side, and the second side may be the display screen side. The image surface IMG located on the second side of the first optical system 100 may have a display screen, for example. The image light from the display screen may sequentially pass through the partial reflection element BS, the third lens E3', the second lens E2' and the quarter wave plate QWP, reach the reflective polarizing element RP, and then be reflected at the reflective polarizing element RP to form the first reflected image light; the first reflected image light then sequentially passes through the quarter wave plate QWP, the second lens E2', the third lens E3' and reaches the partial reflection element BS, and then is reflected at the partial reflection element BS to form the second reflected image light; the second reflected image light then sequentially passes through the third lens E3', the second lens E2', the quarter wave plate QWP, the reflective polarizing element RP and the first lens E1' to the aperture STO' and is finally projected onto a target object (not shown) in space. For example, the light of the first optical system 100 after two reflections may finally be projected into the eyes of the user.

[0099] Table 1 shows the basic parameters of the first optical system of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm). The image light from the image surface (display screen) passes through each element in sequence from 20 to 0 and is finally projected into, for example, the human eye.

[0100]

[0101] Table 1

[0102] In this embodiment, the first side surface S2 of the first lens E1', the first side surface S6 and the second side surface S7 of the second lens E2', and the first side surface S8 and the second side surface S9 of the third lens E3' are all aspherical surfaces, and the surface shape x of each aspherical mirror surface can be defined by but not limited to the following aspherical surface formula:

[0103]

[0104] 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 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0105] Coefficient / Surface S2 S6 S7 S8 S9 A4 1.7237E+00 -1.7897E-01 -2.0077E-01 -1.7781E+00 -1.0784E-01 A6 -1.0531E-02 -4.5955E-02 -2.0784E-01 -4.2544E-01 -6.9805E-02 A8 1.8280E-02 3.6542E-02 -3.5027E-02 -1.1943E-01 -8.2343E-03 A10 1.1790E-02 -2.4898E-03 3.7970E-03 -2.8744E-02 0.0000E+00 A12 1.9481E-03 -5.2026E-03 1.8428E-02 5.6071E-03 0.0000E+00 A14 -2.2963E-03 4.4163E-03 1.3874E-02 9.3229E-03 0.0000E+00 A16 4.9674E-04 -1.1827E-03 -7.2088E-04 1.8844E-03 0.0000E+00 A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0106] Table 2

[0107] Figure 5 The axial chromatic aberration curve of the first optical system of Example 1 is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the first optical system. Figure 6 The astigmatism curve of the first optical system of Example 1 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different field angles. Figure 7 The distortion curve of the first optical system of Example 1 is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figures 5 to 7 It can be seen that the first optical system provided in Example 1 can achieve good imaging quality.

[0108] Example 2

[0109] The following reference Figure 8 A first optical system according to Example 2 of the present application is described.

[0110] like Figure 8As shown, the first optical system 100 includes a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2', a third lens E3' and a partial reflective element BS arranged in sequence from the first side to the second side along the first optical axis, wherein the first side surface of the reflective polarizing element RP is attached to the second side surface of the first lens E1', the first side surface of the quarter wave plate QWP is attached to the second side surface of the reflective polarizing element RP; and the partial reflective element BS is disposed on the second side surface of the third lens E3'. In this embodiment, a stop STO' is further disposed on the first side of the first optical system 100, and an image surface IMG is disposed on the second side.

[0111] In this embodiment, the first side may be the human eye side, and the second side may be the display screen side. The image surface IMG located on the second side of the first optical system 100 may have a display screen, for example. The image light from the display screen may sequentially pass through the partial reflection element BS, the third lens E3', the second lens E2' and the quarter wave plate QWP, reach the reflective polarizing element RP, and then be reflected at the reflective polarizing element RP to form the first reflected image light; the first reflected image light then sequentially passes through the quarter wave plate QWP, the second lens E2', the third lens E3' and reaches the partial reflection element BS, and then is reflected at the partial reflection element BS to form the second reflected image light; the second reflected image light then sequentially passes through the third lens E3', the second lens E2', the quarter wave plate QWP, the reflective polarizing element RP and the first lens E1' to the aperture STO' and is finally projected onto a target object (not shown) in space. For example, the light of the first optical system 100 after two reflections may finally be projected into the eyes of the user.

[0112] Table 3 shows the basic parameters of the first optical system of Example 2, wherein the units of the radius of curvature and thickness / distance are all in millimeters (mm). The image light from the image surface (display screen) passes through each element in sequence from 20 to 0 and is finally projected into, for example, the human eye.

[0113]

[0114] Table 3

[0115] In this embodiment, the first side surface S2 of the first lens E1', the first side surface S6 and the second side surface S7 of the second lens E2', and the first side surface S8 and the second side surface S9 of the third lens E3' are all aspherical surfaces, and the surface shapes of the aspherical surfaces can be defined by the formula (1) given in the above embodiment 1. Table 4 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44 10 , A 12 , A 14 , A16 , A 18 and A 20 .

[0116] Coefficient / Surface S2 S6 S7 S8 S9 A4 -6.1153E-01 -6.0641E-01 -1.0827E+00 -1.6093E+00 4.2211E-03 A6 -3.3166E-01 2.6268E-01 -2.2629E-01 -1.2201E-01 -1.3171E-02 A8 8.0580E-03 -7.4653E-02 -5.0583E-02 1.8394E-02 -1.4171E-03 A10 -1.1441E-02 8.7985E-02 5.2634E-02 -3.2984E-02 0.0000E+00 A12 -2.5244E-03 -2.9213E-02 -2.9721E-02 1.2357E-02 0.0000E+00 A14 8.2930E-03 1.9815E-03 1.0318E-02 -1.0253E-02 0.0000E+00 A16 1.6853E-03 -7.5513E-04 5.9363E-04 1.6463E-03 0.0000E+00 A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0117] Table 4

[0118] Fig. 9 The axial chromatic aberration curve of the first optical system of Example 2 is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the first optical system. Fig.10 The astigmatism curve of the first optical system of Example 2 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different field angles. Fig.11 The distortion curve of the first optical system of Example 2 is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figures 9 to 11 It can be seen that the first optical system provided in Example 2 can achieve good imaging quality.

[0119] Example 3

[0120] The following reference Fig.12 The first optical system according to Example 3 of the present application is described.

[0121] like Fig.12 As shown, the first optical system 100 includes a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2', a third lens E3' and a partial reflective element BS arranged in sequence from the first side to the second side along the first optical axis, wherein the first side surface of the reflective polarizing element RP is attached to the second side surface of the first lens E1', the first side surface of the quarter wave plate QWP is attached to the second side surface of the reflective polarizing element RP; and the partial reflective element BS is disposed on the second side surface of the third lens E3'. In this embodiment, a stop STO' is further disposed on the first side of the first optical system 100, and an image surface IMG is disposed on the second side.

[0122] In this embodiment, the first side may be the human eye side, and the second side may be the display screen side. The image surface IMG located on the second side of the first optical system 100 may have a display screen, for example. The image light from the display screen may sequentially pass through the partial reflection element BS, the third lens E3', the second lens E2' and the quarter wave plate QWP, reach the reflective polarizing element RP, and then be reflected at the reflective polarizing element RP to form the first reflected image light; the first reflected image light then sequentially passes through the quarter wave plate QWP, the second lens E2', the third lens E3' and reaches the partial reflection element BS, and then is reflected at the partial reflection element BS to form the second reflected image light; the second reflected image light then sequentially passes through the third lens E3', the second lens E2', the quarter wave plate QWP, the reflective polarizing element RP and the first lens E1' to the aperture STO' and is finally projected onto a target object (not shown) in space. For example, the light of the first optical system 100 after two reflections may finally be projected into the eyes of the user.

[0123] Table 5 shows the basic parameters of the first optical system of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm). The image light from the image surface (display screen) passes through each element in sequence from 20 to 0 and is finally projected into, for example, the human eye.

[0124]

[0125]

[0126] Table 5

[0127] In this embodiment, the first side surface S2 of the first lens E1', the first side surface S6 and the second side surface S7 of the second lens E2', and the first side surface S8 and the second side surface S9 of the third lens E3' are all aspherical surfaces, and the surface shapes of the aspherical surfaces can be defined by the formula (1) given in the above embodiment 1. Table 6 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0128] Coefficient / Surface S2 S6 S7 S8 S9 A4 -7.7832E-02 -5.2647E-01 -2.6318E-01 -6.2284E-01 6.3214E-03 A6 -8.0278E-02 1.7378E-02 1.4742E-01 1.6363E-01 -1.1485E-02 A8 -4.4280E-02 1.4687E-03 -2.4382E-01 -1.1425E-01 -1.2245E-03 A10 1.4286E-02 -5.6363E-04 4.3098E-02 1.3515E-02 0.0000E+00 A12 -4.7680E-03 -5.7278E-03 -4.1613E-03 6.2756E-03 0.0000E+00 A14 -5.9445E-04 -2.4342E-03 -1.4102E-02 -5.2626E-03 0.0000E+00 A16 -3.2749E-04 4.0963E-04 3.0397E-03 1.3959E-03 0.0000E+00 A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0129] Table 6

[0130] Fig.13 The axial chromatic aberration curve of the first optical system of Example 3 is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the first optical system. Fig.14The astigmatism curve of the first optical system of Example 3 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different field angles. Fig.15 The distortion curve of the first optical system of Example 3 is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figures 13 to 15 It can be seen that the first optical system provided in Example 3 can achieve good imaging quality.

[0131] Example 4

[0132] The following reference Fig.16 Describe the first optical system according to Example 4 of the present application.

[0133] like Fig.16 As shown, the first optical system 100 includes a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2', a third lens E3' and a partial reflective element BS arranged in sequence from the first side to the second side along the first optical axis, wherein the first side surface of the reflective polarizing element RP is attached to the second side surface of the first lens E1', the first side surface of the quarter wave plate QWP is attached to the second side surface of the reflective polarizing element RP; and the partial reflective element BS is disposed on the second side surface of the third lens E3'. In this embodiment, a stop STO' is further disposed on the first side of the first optical system 100, and an image surface IMG is disposed on the second side.

[0134] In this embodiment, the first side may be the human eye side, and the second side may be the display screen side. The image surface IMG located on the second side of the first optical system 100 may have a display screen, for example. The image light from the display screen may sequentially pass through the partial reflection element BS, the third lens E3', the second lens E2' and the quarter wave plate QWP, reach the reflective polarizing element RP, and then be reflected at the reflective polarizing element RP to form the first reflected image light; the first reflected image light then sequentially passes through the quarter wave plate QWP, the second lens E2', the third lens E3' and reaches the partial reflection element BS, and then is reflected at the partial reflection element BS to form the second reflected image light; the second reflected image light then sequentially passes through the third lens E3', the second lens E2', the quarter wave plate QWP, the reflective polarizing element RP and the first lens E1' to the aperture STO' and is finally projected onto a target object (not shown) in space. For example, the light of the first optical system 100 after two reflections may finally be projected into the eyes of the user.

[0135] Table 7 shows the basic parameters of the first optical system of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm). The image light from the image surface (display screen) passes through each element in sequence from 20 to 0 and is finally projected into, for example, the human eye.

[0136]

[0137] Table 7

[0138] In this embodiment, the first side surface S2 and the second side surface S3 of the first lens E1', the first side surface S6 and the second side surface S7 of the second lens E2', and the first side surface S8 and the second side surface S9 of the third lens E3' are all aspherical surfaces, and the surface shapes of the aspherical surfaces can be defined by the formula (1) given in the above embodiment 1. Table 8 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0139]

[0140]

[0141] Table 8

[0142] Fig.17 The axial chromatic aberration curve of the first optical system of Example 4 is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the first optical system. Fig.18 The astigmatism curve of the first optical system of Example 4 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different field angles. Fig.19 The distortion curve of the first optical system of Example 4 is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figures 17 to 19 It can be seen that the first optical system provided in Example 4 can achieve good imaging quality.

[0143] In the first optical system given in Examples 1 to 4, the combined focal length f23A of the second lens and the third lens, the effective focal length f1A of the first lens, the effective focal length f2A of the second lens, the effective focal length f3A of the third lens, the entrance pupil diameter EPDA of the first optical system, the effective focal length fA of the first optical system, the distance TDA from the first side surface of the first lens to the second side surface of the third lens on the first optical axis, the center thickness CTRA of the reflective polarizing element on the first optical axis, and the center thickness CTQA of the quarter-wave plate on the first optical axis are respectively as shown in Table 9 below.

[0144] Parameters / Examples Example 1 Example 2 Example 3 Example 4 f23A(mm) 109.59 109.20 77.77 109.38 f1A(mm) 172.57 113.80 121.98 -224.02 f2A(mm) 170.50 -82.65 3289.20 56.52 f3A(mm) 292.23 48.66 79.22 -139.15 EPDA(mm) 5.00 5.00 5.00 5.00 fA(mm) 28.26 15.66 15.99 14.39 TDA(mm) 20.85 13.15 13.57 8.26 CTRA(mm) 0.10 0.10 0.10 0.10 CTQA(mm) 0.10 0.10 0.10 0.10

[0145] Table 9

[0146] Specific embodiments of the second optical system applicable to the above-mentioned embodiment will be further described below with reference to the accompanying drawings.

[0147] Example 5

[0148] The following reference Fig. 20 The second optical system according to Example 5 of the present application is described.

[0149] like Fig. 20 As shown, the second optical system 200 includes a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface arranged in sequence from the object side to the image side along the second optical axis.

[0150] In this embodiment, the first lens E1 has negative power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is concave, and the image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive power, its object side surface S7 is concave, and the image side surface S8 is convex. The fifth lens E5 has positive power, its object side surface S9 is convex, and the image side surface S10 is convex. The sixth lens E6 has negative power, its object side surface S11 is concave, and the image side surface S12 is concave. The seventh lens E7 has positive power, its object side surface S13 is convex, and the image side surface S14 is convex. The eighth lens E8 has positive power, its object side surface S15 is convex, and the image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object can pass through the surfaces S1 to S18 in sequence and finally be imaged on the imaging surface S19.

[0151] Table 10 shows basic parameters of the second optical system of Example 5, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0152]

[0153] Table 10

[0154] In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the eighth lens E8 are aspherical surfaces, and the surface shape of each aspherical surface can be defined by the formula (1) given in the above-mentioned embodiment 1. Tables 11-1 and 11-2 show the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, 10 , A 12 , A 14 , A 16 , A 18 , A 20, A 22 , A 24 , A 26 , A 28 and A 30 .

[0155]

[0156]

[0157] Table 11-1

[0158] Face number / coefficient A18 A20 A22 A24 A26 A28 A30 S3 9.8791E-04 -1.6951E-04 2.1039E-05 -1.8368E-06 1.0692E-07 -3.7231E-09 5.8631E-11 S4 8.1124E+01 -4.9805E+01 2.1799E+01 -6.6324E+00 1.3323E+00 -1.5882E-01 8.5043E-03 S5 4.6550E+01 -3.0552E+01 1.4230E+01 -4.5914E+00 9.7559E-01 -1.2277E-01 6.9296E-03 S6 -9.1615E+02 8.5091E+02 -5.6627E+02 2.6315E+02 -8.1070E+01 1.4874E+01 -1.2299E+00 S7 1.2736E+00 -7.6831E-01 2.7812E-01 -5.6267E-02 4.9060E-03 0.0000E+00 0.0000E+00 S8 4.4088E-02 -9.1678E-03 1.0942E-03 -5.6933E-05 0.0000E+00 0.0000E+00 0.0000E+00 S9 1.6101E-02 -4.2041E-03 7.7725E-04 -9.7817E-05 7.7853E-06 -3.3755E-07 5.3948E-09 S10 6.9591E-02 -4.0629E-02 1.3106E-02 -2.6489E-03 3.3504E-04 -2.4392E-05 7.8351E-07 S11 9.2896E-02 -4.3757E-02 1.2946E-02 -2.4906E-03 3.0429E-04 -2.1546E-05 6.7552E-07 S12 -1.0946E-02 5.8194E-03 -1.7805E-03 3.4726E-04 -4.2745E-05 3.0388E-06 -9.5342E-08 S13 -1.9266E-02 4.8799E-03 -8.6606E-04 1.0252E-04 -7.3801E-06 2.6232E-07 -2.0857E-09 S14 -8.5270E-02 2.2474E-02 -4.3144E-03 5.8495E-04 -5.2961E-05 2.8682E-06 -7.0165E-08 S15 -1.2759E-02 2.4634E-03 -3.4357E-04 3.3635E-05 -2.1891E-06 8.4924E-08 -1.4839E-09 S16 -2.6456E-03 5.4112E-04 -7.8648E-05 7.9158E-06 -5.2393E-07 2.0493E-08 -3.5860E-10

[0159] Table 11-2

[0160] Fig.21 The axial chromatic aberration curve of the second optical system of Example 5 is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the second optical system. Fig. 22 The astigmatism curve of the second optical system of Example 5 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.21 and Fig. 22 It can be seen that the second optical system provided in Example 5 can achieve good imaging quality.

[0161] Example 6

[0162] The following reference Fig.23 The second optical system according to Example 6 of the present application is described.

[0163] like Fig.23 As shown, the second optical system 200 includes a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface arranged in sequence from the object side to the image side along the second optical axis.

[0164] In this embodiment, the first lens E1 has negative power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is concave, and the image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive power, its object side surface S7 is concave, and the image side surface S8 is convex. The fifth lens E5 has positive power, its object side surface S9 is convex, and the image side surface S10 is convex. The sixth lens E6 has negative power, its object side surface S11 is concave, and the image side surface S12 is concave. The seventh lens E7 has positive power, its object side surface S13 is convex, and the image side surface S14 is convex. The eighth lens E8 has positive power, its object side surface S15 is convex, and the image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object can pass through the surfaces S1 to S18 in sequence and finally be imaged on the imaging surface S19.

[0165] Table 12 shows the basic parameters of the second optical system of Example 6, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0166]

[0167] Table 12

[0168] In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the eighth lens E8 are aspherical surfaces, and the surface shape of each aspherical surface can be defined by the formula (1) given in the above-mentioned embodiment 1. Tables 13-1 and 13-2 show the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0169] Face number / coefficient A4 A6 A8 A10 A12 A14 A16 S3 -2.6749E-02 6.2251E-02 -7.7864E-02 6.7573E-02 -4.1146E-02 1.7914E-02 -5.6644E-03 S4 -1.4769E-01 8.2606E-01 -4.3203E+00 1.5016E+01 -3.5258E+01 5.7290E+01 -6.5814E+01 S5 -1.3890E-02 2.1753E-01 -1.3371E+00 5.2712E+00 -1.3693E+01 2.4185E+01 -2.9833E+01 S6 8.5792E-02 -5.1630E-01 4.5106E+00 -2.3976E+01 8.4988E+01 -2.0949E+02 3.6838E+02 S7 8.7268E-03 -4.8330E-02 5.6934E-02 2.4970E-01 -1.1762E+00 2.3559E+00 -2.8079E+00 S8 -2.1471E-02 5.9646E-02 -1.1876E-01 1.5943E-01 -1.3865E-01 7.7516E-02 -2.6882E-02 S9 -2.3598E-02 4.6178E-02 -8.9381E-02 1.2384E-01 -1.2021E-01 8.3664E-02 -4.2371E-02 S10 -3.7354E-02 -1.0424E-01 4.5855E-01 -8.0838E-01 7.8769E-01 -4.4831E-01 1.3524E-01 S11 3.1022E-02 1.1025E-01 -2.4027E-02 -2.2594E-01 3.0995E-01 -1.6801E-01 1.6398E-02 S12 4.7382E-03 5.5811E-02 1.3894E-02 -1.7974E-01 3.0399E-01 -2.9404E-01 1.9105E-01 S13 1.5023E-02 -2.1134E-01 4.2561E-01 -5.4612E-01 4.9482E-01 -3.2654E-01 1.5918E-01 S14 1.3551E-01 -5.0301E-01 8.1048E-01 -8.7161E-01 6.7731E-01 -3.9027E-01 1.6857E-01 S15 7.1887E-02 -3.1336E-01 4.4883E-01 -4.1781E-01 2.7294E-01 -1.2871E-01 4.4455E-02 S16 7.4397E-02 -1.1290E-01 9.6392E-02 -7.7573E-02 5.5481E-02 -3.1280E-02 1.3131E-02

[0170] Table 13-1

[0171]

[0172]

[0173] Table 13-2

[0174] Fig.24The axial chromatic aberration curve of the second optical system of Example 6 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the second optical system. Fig.25 The astigmatism curve of the second optical system of Example 6 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.24 and Fig.25 It can be seen that the second optical system provided in Example 6 can achieve good imaging quality.

[0175] Example 7

[0176] The following reference Fig.26 The second optical system according to Example 7 of the present application is described.

[0177] like Fig.26 As shown, the second optical system 200 includes a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface arranged in sequence from the object side to the image side along the second optical axis.

[0178] In this embodiment, the first lens E1 has negative power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is concave, and the image side surface S6 is convex. The fourth lens E4 has positive power, its object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has negative power, its object side surface S9 is convex, and the image side surface S10 is concave. The sixth lens E6 has negative power, its object side surface S11 is concave, and the image side surface S12 is convex. The seventh lens E7 has positive power, its object side surface S13 is convex, and the image side surface S14 is convex. The eighth lens E8 has negative power, its object side surface S15 is concave, and the image side surface S16 is convex. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object can pass through the surfaces S1 to S18 in sequence and finally be imaged on the imaging surface S19.

[0179] Table 14 shows basic parameters of the second optical system of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0180]

[0181]

[0182] Table 14

[0183] In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the eighth lens E8 are aspherical surfaces, and the surface shape of each aspherical surface can be defined by the formula (1) given in the above-mentioned embodiment 1. Table 15 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A 10 , A 12 , A 14 and A 16 .

[0184] Face number / coefficient A4 A6 A8 A10 A12 A14 A16 S3 8.9298E-02 -5.4309E-02 2.2149E-02 -6.3682E-03 1.1680E-03 -1.1917E-04 5.1661E-06 S4 1.0247E-01 -3.8395E-02 -4.5302E-03 8.1931E-03 1.9099E-03 -4.0485E-03 1.0603E-03 S5 -2.0096E-02 -3.2065E-03 -9.5992E-03 1.2870E-02 -1.1030E-02 4.6511E-03 -7.6454E-04 S6 -3.3965E-02 1.0110E-02 -3.0157E-02 3.9085E-02 -2.6270E-02 8.8194E-03 -1.1369E-03 S7 -1.7583E-03 -1.7643E-02 1.5077E-02 -6.9004E-03 -4.2219E-04 1.6891E-03 -4.4624E-04 S8 9.8444E-02 -4.4437E-02 1.3198E-02 1.6890E-03 -8.8315E-03 5.3311E-03 -1.0075E-03 S9 -2.3813E-01 1.4589E-01 6.9229E-03 -7.4235E-02 4.3334E-02 -1.0024E-02 7.5499E-04 S10 -2.0844E-01 1.4023E-01 -6.2861E-02 1.7298E-02 -2.7494E-03 2.2930E-04 -9.3904E-06 S11 3.4993E-01 -3.3086E-01 2.0183E-01 -7.8038E-02 1.8841E-02 -2.6066E-03 1.5898E-04 S12 1.0765E-02 -3.8220E-02 3.5533E-02 -2.1289E-02 7.7995E-03 -1.5001E-03 1.1730E-04 S13 -8.8282E-02 4.5396E-02 -2.0367E-02 6.2777E-03 -1.1803E-03 1.2359E-04 -5.5793E-06 S14 -3.1592E-02 2.2121E-02 -7.4006E-03 1.5974E-03 -2.1927E-04 1.8806E-05 -7.9900E-07 S15 1.8244E-01 -1.0551E-01 4.1941E-02 -1.0852E-02 1.7009E-03 -1.4513E-04 5.1556E-06 S16 1.9951E-01 -9.3892E-02 2.9126E-02 -6.1129E-03 8.1530E-04 -6.0967E-05 1.9044E-06

[0185] Table 15

[0186] Fig. 27 The axial chromatic aberration curve of the second optical system of Example 7 is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the second optical system. Fig.28 The astigmatism curve of the second optical system of Example 7 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig. 27 and Fig.28 It can be seen that the second optical system provided in Example 7 can achieve good imaging quality.

[0187] In addition, in the second optical systems given in Examples 5 to 7, the effective focal length f1B of the first lens E1, the effective focal length f2B of the second lens E2, the effective focal length f3B of the third lens E3, the effective focal length f4B of the fourth lens E4, the effective focal length f5B of the fifth lens E5, the effective focal length f6B of the sixth lens E6, the effective focal length f7B of the seventh lens E7, the effective focal length f8B of the eighth lens, the effective focal length fB of the second optical system, the entrance pupil diameter EPDB of the second optical system, the sum ∑CTB of the center thickness of each lens of the first lens to the eighth lens on the second optical axis, and the distance TDB from the object side surface of the first lens to the image side surface of the eighth lens on the second optical axis are respectively as shown in Table 16 below.

[0188] Parameters / Examples Example 5 Example 6 Example 7 f1B(mm) -7.28 -8.21 -5.73 f2B(mm) -2.61 -2.86 -4.81 f3B(mm) 5.68 6.08 9.62 f4B(mm) 4.42 5.10 2.33 f5B(mm) 4.00 4.38 -2.89 f6B(mm) -2.64 -2.98 -38.04 f7B(mm) 4.86 5.42 2.11 f8B(mm) 4.63 4.95 -4.44 fB(mm) 1.36 1.50 1.39 EPDB(mm) 1.23 1.43 1.06 ∑CTB(mm) 6.75 7.44 5.49 TDB(mm) 10.22 11.29 9.35

[0189] Table 16

[0190] refer to Figure 1The virtual reality device 10 provided in the present application may include the first optical system 100 provided in any one of the above embodiments 1-4 and the second optical system 200 provided in any one of the above embodiments 5-7. There are 12 combinations of the embodiments of the first optical system 100 and the embodiments of the second optical system 200, that is, the virtual reality device 10 may have 12 examples. Among them, the virtual reality device corresponding to Example 1 includes the first optical system of Example 1 and the second optical system of Example 5, the virtual reality device corresponding to Example 2 includes the first optical system of Example 1 and the second optical system of Example 6, the virtual reality device corresponding to Example 3 includes the first optical system of Example 1 and the second optical system of Example 7, the virtual reality device corresponding to Example 4 includes the first optical system of Example 2 and the second optical system of Example 5, the virtual reality device corresponding to Example 5 includes the first optical system of Example 2 and the second optical system of Example 6, the virtual reality device corresponding to Example 6 includes the first optical system of Example 2 and the second optical system of Example 7, the virtual reality device corresponding to Example 7 includes the first optical system of Example 3 and the second optical system of Example 5, the virtual reality device corresponding to Example 8 includes the first optical system of Example 3 and the second optical system of Example 6, the virtual reality device corresponding to Example 9 includes the first optical system of Example 3 and the second optical system of Example 7, the virtual reality device corresponding to Example 10 includes the first optical system of Example 4 and the second optical system of Example 5, the virtual reality device corresponding to Example 11 includes the first optical system of Example 4 and the second optical system of Example 6, and the virtual reality device corresponding to Example 12 includes the first optical system of Example 4 and the second optical system of Example 7. The virtual reality devices of Examples 1 to 12 above satisfy the conditions shown in Table 17-1 and Table 17-2, respectively.

[0191]

[0192]

[0193] Table 17-1

[0194] Conditional / Example Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 fA / fB 11.78 10.68 11.53 10.60 9.61 10.37 TDB / TDA 0.75 0.83 0.69 1.24 1.37 1.13 EPDA / EPDB 4.05 3.51 4.72 4.05 3.51 4.72 f23A / (CT2A+CT3A) 8.70 8.70 8.70 16.15 16.15 16.15 f3A / f1A 0.65 0.65 0.65 0.62 0.62 0.62 |R6A / R5A| 0.44 0.44 0.44 1.32 1.32 1.32 (CT1A+CTRA+CTQA) / TDA 0.29 0.29 0.29 0.12 0.12 0.12 f1B / (f2B+f3B) -2.36 -2.55 -1.19 -2.36 -2.55 -1.19 f4B / R8B -1.99 -2.02 -1.09 -1.99 -2.02 -1.09 f8B / f5B 1.16 1.13 1.54 1.16 1.13 1.54 (CT5B+CT6B+CT7B) / (CT2B+CT3B) 3.21 3.10 2.17 3.21 3.10 2.17 ∑CTB / T12B 3.34 3.27 3.15 3.34 3.27 3.15 f7B / CT7B 4.68 4.78 1.17 4.68 4.78 1.17 fB / EPDB 1.10 1.05 1.31 1.10 1.05 1.31 R1B / R1A 0.13 0.14 0.10 -0.45 -0.50 -0.36

[0195] Table 17-2

[0196] In an exemplary embodiment, the virtual reality device provided by the present application may include not only the first optical system and the second optical system as described above, but also one or more other optical systems, for example, a third optical system, a fourth optical system, etc. That is, the virtual reality device provided by the present application may have two, three or more optical systems. Figure 1In an exemplary embodiment, the virtual reality device 10 provided in the present application may include a first optical system 100 , a second optical system 200 , and may also include a third optical system 300 .

[0197] In an exemplary embodiment, the virtual reality device provided by the present application may include one second optical system 200, or may include two or more second optical systems 200 as required. Figure 1 The third optical system 300 shown may also be another second optical system 200 , for example.

[0198] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. A virtual reality device, comprising a first optical system and a second optical system, characterized in that, The first optical system sequentially includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens along a first optical axis from a first side to a second side, wherein, The first lens has a positive or negative optical power; The second lens has a positive or negative optical power; The third lens has a positive or negative optical power, and its second side is convex; The second optical system sequentially includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element along a second optical axis from an object side to an image side, wherein, The first lens element has a negative optical power, its object side is convex, and its image side is concave; The second lens element has a negative optical power, and its image side is concave; The third lens element has a positive optical power; The fourth lens element has a positive optical power, and its image side is convex; The fifth lens element has a positive or negative optical power, and its object side is convex; The sixth lens element has a negative optical power, and its object side is concave; The seventh lens element has a positive optical power, its object side is convex, and its image side is convex; The eighth lens element has a positive or negative optical power; The real image formed by the second optical system is transmitted to a display screen in the form of an electrical signal, and the first optical system is used to project a virtual image on the display screen and transmit the real image to the display screen; and The virtual reality device satisfies: 3.5 < EPDA / EPDB < 4.8, where EPDA is the entrance pupil diameter of the first optical system and EPDB is the entrance pupil diameter of the second optical system.

2. The virtual reality device according to claim 1, characterized in that: The distance TDB on the second optical axis from the object side of the first lens element to the image side of the eighth lens element and the distance TDA on the first optical axis from the first side of the first lens to the second side of the third lens satisfy: 0.4 < TDB / TDA < 1.

4.

3. The virtual reality device according to claim 1, characterized in that: The combined focal length f23A of the second lens and the third lens, the central thickness CT2A of the second lens on the first optical axis, and the central thickness CT3A of the third lens on the first optical axis satisfy: 8.6 < f23A / (CT2A + CT3A) < 16.

2.

4. The virtual reality device according to claim 1, characterized in that: The effective focal length f3A of the third lens and the effective focal length f1A of the first lens satisfy: 0.4 < f3A / f1A < 1.

7.

5. The virtual reality device according to claim 1, characterized in that: The radius of curvature R6A of the second side of the third lens and the radius of curvature R5A of the first side of the third lens satisfy: 0.2 < |R6A / R5A| < 1.

4.

6. The virtual reality device according to claim 1, characterized in that: The central thickness CT1A of the first lens on the first optical axis, the central thickness CTR A of the reflective polarizing element on the first optical axis, the central thickness CTQ A of the quarter-wave plate on the first optical axis, and the distance TDA on the first optical axis from the first side of the first lens to the second side of the third lens satisfy: 0.1 < (CT1A + CTR A + CTQ A) / TDA < 0.

4.

7. The virtual reality device according to claim 1, characterized in that: The effective focal length f1B of the first lens, the effective focal length f2B of the second lens and the effective focal length f3B of the third lens satisfy: -2.6 <f1B / (f2B+f3B)<-1.1。 8. The virtual reality device according to any one of claims 1 to 7, characterized in that: The effective focal length f4B of the fourth lens and the curvature radius R8B of the image side surface of the fourth lens satisfy: -2.1 <f4B / R8B<-1.0。 9. The virtual reality device according to any one of claims 1 to 7, characterized in that: The effective focal length f8B of the eighth lens and the effective focal length f5B of the fifth lens satisfy: 1.1 <f8B / f5B<1.6。 10. The virtual reality device according to any one of claims 1 to 7, characterized in that: The center thickness CT5B of the fifth lens on the second optical axis, the center thickness CT6B of the sixth lens on the second optical axis, the center thickness CT7B of the seventh lens on the second optical axis, the center thickness CT2B of the second lens on the second optical axis and the center thickness CT3B of the third lens on the second optical axis satisfy: 2.1<(CT5B+CT6B+CT7B) / (CT2B+CT3B)<3.

3.

11. The virtual reality device according to any one of claims 1 to 7, characterized in that: The sum ∑CTB of the center thickness of each lens from the first lens to the eighth lens on the second optical axis and the air interval T12B between the first lens and the second lens on the second optical axis satisfy: 3.1<∑CTB / T12B<3.

4.

12. The virtual reality device according to any one of claims 1 to 7, characterized in that: The effective focal length f7B of the seventh lens and the center thickness CT7B of the seventh lens on the second optical axis satisfy: 1.1 <f7B / CT7B<4.8。 13. The virtual reality device according to any one of claims 1 to 7, characterized in that: The effective focal length fB of the second optical system satisfies: 1.0 <fB / EPDB<1.4。 14. The virtual reality device according to any one of claims 1 to 7, characterized in that: The curvature radius R1B of the object side surface of the first lens and the curvature radius R1A of the first side surface of the first lens satisfy: -0.6 <R1B / R1A<0.2。 15. A virtual reality device, comprising a first optical system and a second optical system, characterized in that: The first optical system includes a first lens, a reflective polarizing element, a quarter wave plate, a second lens and a third lens in sequence from the first side to the second side along the first optical axis, wherein: The first lens has positive or negative optical power; The second lens has positive or negative optical power; The third lens has positive or negative optical power, and its second side surface is convex; The second optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in order from the object side to the image side along the second optical axis, wherein: The first lens has negative optical power, and its object side surface is convex and its image side surface is concave; The second lens has negative optical power, and its image side surface is concave; The third lens has positive optical power; The fourth lens has positive power, and its image side surface is convex; The fifth lens has positive or negative optical power, and its object side surface is convex; The sixth lens has negative optical power, and its object side surface is concave; The seventh lens has positive power, and its object side surface is convex, and its image side surface is convex; The eighth lens has positive or negative optical power; The real image formed by the second optical system is transmitted to the display screen in the form of an electrical signal, and the first optical system is used to project the virtual image on the display screen and the real image transmitted to the display screen; and The virtual reality device satisfies: 9.6 < fA / fB < 20.9, where fA is the effective focal length of the first optical system and fB is the effective focal length of the second optical system.

16. The virtual reality device according to claim 15, characterized in that: The distance TDB on the second optical axis from the object side surface of the first lens to the image side surface of the eighth lens and the distance TDA on the first optical axis from the first side surface of the first lens to the second side surface of the third lens satisfy: 0.4 < TDB / TDA < 1.

4.

17. The virtual reality device according to claim 15, characterized in that: The combined focal length f23A of the second lens and the third lens, the central thickness CT2A of the second lens on the first optical axis and the central thickness CT3A of the third lens on the first optical axis satisfy: 8.6 < f23A / (CT2A + CT3A) < 16.

2.

18. The virtual reality device according to claim 15, characterized in that: The effective focal length f3A of the third lens and the effective focal length f1A of the first lens satisfy: 0.4 < f3A / f1A < 1.

7.

19. The virtual reality device according to claim 15, characterized in that: The radius of curvature R6A of the second side surface of the third lens and the radius of curvature R5A of the first side surface of the third lens satisfy: 0.2 < |R6A / R5A| < 1.

4.

20. The virtual reality device according to claim 15, characterized in that: The central thickness CT1A of the first lens on the first optical axis, the central thickness CTR A of the reflective polarizing element on the first optical axis, the central thickness CTQ A of the quarter-wave plate on the first optical axis, and the distance TDA on the first optical axis from the first side surface of the first lens to the second side surface of the third lens satisfy: 0.1 < (CT1A + CTR A + CTQ A) / TDA < 0.

4.

21. The virtual reality device according to claim 15, characterized in that: The effective focal length f1B of the first lens, the effective focal length f2B of the second lens, and the effective focal length f3B of the third lens satisfy: -2.6 < f1B / (f2B + f3B) < -1.

1.

22. The virtual reality device according to any one of claims 15 to 21, characterized in that: The effective focal length f4B of the fourth lens and the radius of curvature R8B of the image side surface of the fourth lens satisfy: -2.1 < f4B / R8B < -1.

0.

23. The virtual reality device according to any one of claims 15 to 21, characterized in that: The effective focal length f8B of the eighth lens and the effective focal length f5B of the fifth lens satisfy: 1.1 < f8B / f5B < 1.

6.

24. The virtual reality device according to any one of claims 15 to 21, characterized in that: The central thickness CT5B of the fifth lens on the second optical axis, the central thickness CT6B of the sixth lens on the second optical axis, the central thickness CT7B of the seventh lens on the second optical axis, the central thickness CT2B of the second lens on the second optical axis, and the central thickness CT3B of the third lens on the second optical axis satisfy: 2.1 < (CT5B + CT6B + CT7B) / (CT2B + CT3B) < 3.

3.

25. The virtual reality device according to any one of claims 15 to 21, characterized in that: The sum ∑CTB of the central thicknesses of each lens from the first lens to the eighth lens on the second optical axis and the air gap T12B between the first lens and the second lens on the second optical axis satisfy: 3.1 < ∑CTB / T12B < 3.

4.

26. The virtual reality device according to any one of claims 15 to 21, characterized in that: The effective focal length f7B of the seventh lens and the center thickness CT7B of the seventh lens on the second optical axis satisfy: 1.1 <f7B / CT7B<4.8。 27. The virtual reality device according to any one of claims 15 to 21, characterized in that: The effective focal length fB of the second optical system satisfies: 1.0 <fB / EPDB<1.4。 28. The virtual reality device according to any one of claims 15 to 21, characterized in that: The curvature radius R1B of the object side surface of the first lens and the curvature radius R1A of the first side surface of the first lens satisfy: -0.6 <R1B / R1A<0.2。

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