Virtual reality device

Abstract

The embodiment of the utility model discloses a virtual reality device, which comprises a first optical system and a second optical system, and is characterized in that the first optical system sequentially comprises a first lens, a reflective polarizing element, a quarter-wave plate, a second lens and a third lens from a first side to a second side along a first optical axis; wherein the first lens has positive focal power, the second lens has positive focal power or negative focal power, and the third lens has positive focal power; the second optical system sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with negative focal power from the object side to the image side along the second optical axis; a seventh lens with positive focal power and an eighth lens with positive focal power; wherein a real image formed by the second optical system is transmitted to the information processing unit in the form of an electric signal, and the first optical system is used for projecting a virtual image on the display screen.

Description

Technical Field

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

[0002] VR (Virtual Reality) technology creates a realistic simulated environment, allowing users to feel as if they are in a different environment, bringing tremendous changes in social, entertainment, medical, and education fields.

[0003] With the continuous development of VR technology, consumers have an increasing demand for VR interactive experience. In order to further improve the immersive experience of virtual reality devices, a positioning system must be equipped. The current mainstream infrared optical positioning and laser positioning technologies have high positioning accuracy, but they mainly rely on the cooperation of external devices, which limits the application scenarios of virtual reality devices and is costly.

[0004] Therefore, how to optimize the optical design of the virtual reality device so that its positioning lens can be suitable for positioning in different external environments is one of the technical problems that need to be solved at present. Utility Model Content

[0005] According to an embodiment of the present application, a virtual reality device is provided, including a first optical system and a second optical system. The first optical system includes, along a first optical axis, from a first side away from a display screen to a second side close to the display screen, a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens in sequence; wherein the first lens has positive optical power, the second lens has positive optical power or negative optical power, and the third lens has positive optical power; the second optical system includes, along a second optical axis, from an object side to an image side, a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, and a fourth lens with positive optical power. three lenses, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power and an eighth lens with positive optical power; wherein, the real image formed by the second optical system is transmitted to the information processing unit in the form of an electrical signal, and the first optical system is used to project a virtual image on a display screen; and the effective focal length fA of the first optical system, the effective focal length f1A of the first lens, the effective focal length fB of the second optical system and the effective focal length f1B of the first lens satisfy: -1.2<(fA / f1A) / (fB / f1B)<-0.2.

[0006] In one or more embodiments, the effective focal length fA of the first optical system, the entrance pupil diameter EPDA of the first optical system, the effective focal length fB of the second optical system, and the entrance pupil diameter EPDB of the second optical system satisfy: 1.8<(fA / EPDA-fB / EPDB)<2.2.

[0007] In one or more embodiments, the combined focal length f23A of the second lens and the third lens in the first optical system, the center thickness CT2A of the second lens on the first optical axis, the air gap T23A between the second side surface of the second lens and the first side surface of the third lens in the first optical system on the first optical axis, and the center thickness CT3A of the third lens on the first optical axis satisfy: 8.2 <f23A / (CT2A+T23A+CT3A)<17.7。

[0008] In one or more embodiments, the radius of curvature R2A of the second side of the first lens satisfies the combined focal length fzA of the first lens, the reflective polarizing element and the quarter-wave plate in the first optical system: -1.5 <R2A / fzA<-0.4。

[0009] In one or more embodiments, the effective focal length f2A of the second lens and the curvature radius R3A of the first side surface of the second lens satisfy: 1.4 <f2A / R3A<2.3。

[0010] In one or more embodiments, the effective focal length fA of the first optical system and the maximum field of view FOVA of the first optical system satisfy: 16.5 mm <fA*tan(FOVA / 2)<17.7mm。

[0011] In one or more embodiments, the effective focal length f2B of the second lens, the curvature radius R3B of the object side surface of the second lens, and the curvature radius R4B of the image side surface of the second lens satisfy: 0.1 <f2B / (R3B+R4B)<0.5。

[0012] In one or more embodiments, the effective focal length f3B of the third lens and the effective focal length f7B of the seventh lens satisfy: 0.8 <f3B / f7B<1.2。

[0013] In one or more embodiments, the effective focal length f4B of the fourth lens, the center thickness CT4B of the fourth lens on the second optical axis, the effective focal length f5B of the fifth lens, and the center thickness CT5B of the fifth lens on the second optical axis satisfy: 6.0<(f4B / CT4B)*(f5B / CT5B)<8.2.

[0014] In one or more embodiments, the effective focal length f6B of the sixth lens and the curvature radius R11B of the object side surface of the sixth lens satisfy: 1.3 <f6B / R11B<1.7。

[0015] In one or more embodiments, the sum of the center thicknesses ∑CTA of the first lens to the third lens in the first optical system on the first optical axis, the sum of the center thicknesses ∑CTB of the first lens to the eighth lens in the second optical system on the second optical axis, the effective focal length fA of the first optical system, and the effective focal length fB of the second optical system satisfy: 4.3<(∑CTA / fA)*(∑CTB / fB)<7.0.

[0016] In one or more embodiments, the distance TDB from the object side surface of the first lens to the image side surface of the eighth lens in the second optical system on the second optical axis, the entrance pupil diameter EPDB of the second optical system, the distance TDA from the first side surface of the first lens to the second side surface of the third lens in the first optical system on the first optical axis, and the entrance pupil diameter EPDA of the first optical system satisfy: 2.6<(TDB / EPDB) / (TDA / EPDA)<4.5.

[0017] In one or more embodiments, a curvature radius R5B of the object side surface of the third lens, a curvature radius R6B of the image side surface of the third lens, a curvature radius R9B of the object side surface of the fifth lens, and a curvature radius R10B of the image side surface of the fifth lens satisfy: -0.3<(R5B / R6B)*(R9B / R10B)<-0.1.

[0018] According to an embodiment of the present application, a virtual reality device is further provided, including a first optical system and a second optical system. The first optical system includes, in order from a first side away from a display screen to a second side close to the display screen along a first optical axis: a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens; wherein the first lens has positive optical power, the second lens has positive optical power or negative optical power, and the third lens has positive optical power; the second optical system includes, in order from an object side to an image side along a second optical axis: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a a fourth lens having positive power, a fifth lens having positive power, a sixth lens having negative power, a seventh lens having positive power and an eighth lens having positive power; wherein the real image formed by the second optical system is transmitted to the information processing unit in the form of an electrical signal, and the first optical system is used to project a virtual image on a display screen; and the effective focal length f3A of the third lens, the curvature radius R6A of the second side surface of the third lens, the effective focal length f8B of the eighth lens and the curvature radius R16B of the image side surface of the eighth lens satisfy: -2.2<(f3A / R6A)*(f8B / R16B)<-1.6.

[0019] In one or more embodiments, the effective focal length fA of the first optical system, the entrance pupil diameter EPDA of the first optical system, the effective focal length fB of the second optical system, and the entrance pupil diameter EPDB of the second optical system satisfy: 1.8<(fA / EPDA-fB / EPDB)<2.2.

[0020] In one or more embodiments, the combined focal length f23A of the second lens and the third lens in the first optical system, the center thickness CT2A of the second lens on the first optical axis, the air gap T23A between the second side surface of the second lens and the first side surface of the third lens in the first optical system on the first optical axis, and the center thickness CT3A of the third lens on the first optical axis satisfy: 8.2 <f23A / (CT2A+T23A+CT3A)<17.7。

[0021] In one or more embodiments, the radius of curvature R2A of the second side of the first lens satisfies the combined focal length fzA of the first lens, the reflective polarizing element and the quarter-wave plate in the first optical system: -1.5 <R2A / fzA<-0.4。

[0022] In one or more embodiments, the effective focal length f2A of the second lens and the curvature radius R3A of the first side surface of the second lens satisfy: 1.4 <f2A / R3A<2.3。

[0023] In one or more embodiments, the effective focal length fA of the first optical system and the maximum field of view FOVA of the first optical system satisfy: 16.5 mm <fA*tan(FOVA / 2)<17.7mm。

[0024] In one or more embodiments, the effective focal length f2B of the second lens, the curvature radius R3B of the object side surface of the second lens, and the curvature radius R4B of the image side surface of the second lens satisfy: 0.1 <f2B / (R3B+R4B)<0.5。

[0025] In one or more embodiments, the effective focal length f3B of the third lens and the effective focal length f7B of the seventh lens satisfy: 0.8 <f3B / f7B<1.2。

[0026] In one or more embodiments, the effective focal length f4B of the fourth lens, the center thickness CT4B of the fourth lens on the second optical axis, the effective focal length f5B of the fifth lens, and the center thickness CT5B of the fifth lens on the second optical axis satisfy: 6.0<(f4B / CT4B)*(f5B / CT5B)<8.2.

[0027] In one or more embodiments, the effective focal length f6B of the sixth lens and the curvature radius R11B of the object side surface of the sixth lens satisfy: 1.3 <f6B / R11B<1.7。

[0028] In one or more embodiments, the sum of the center thicknesses ∑CTA of the first lens to the third lens in the first optical system on the first optical axis, the sum of the center thicknesses ∑CTB of the first lens to the eighth lens in the second optical system on the second optical axis, the effective focal length fA of the first optical system, and the effective focal length fB of the second optical system satisfy: 4.3<(∑CTA / fA)*(∑CTB / fB)<7.0.

[0029] In one or more embodiments, the distance TDB from the object side surface of the first lens to the image side surface of the eighth lens in the second optical system on the second optical axis, the entrance pupil diameter EPDB of the second optical system, the distance TDA from the first side surface of the first lens to the second side surface of the third lens in the first optical system on the first optical axis, and the entrance pupil diameter EPDA of the first optical system satisfy: 2.6<(TDB / EPDB) / (TDA / EPDA)<4.5.

[0030] In one or more embodiments, a curvature radius R5B of the object side surface of the third lens, a curvature radius R6B of the image side surface of the third lens, a curvature radius R9B of the object side surface of the fifth lens, and a curvature radius R10B of the image side surface of the fifth lens satisfy: -0.3<(R5B / R6B)*(R9B / R10B)<-0.1.

[0031] The virtual reality device provided according to the embodiment of the present application may include a first optical system and a second optical system, wherein the first optical system may be composed of three lenses, and a reflective polarizing element and a quarter-wave plate may be combined to realize optical path folding, so as to reduce the total length of the system; the second optical system may be composed of eight lenses, wherein the first lens has a negative optical focal length, which is beneficial to improving the field of view of the system; the second lens and the third lens are a combination of negative and positive lenses, and the purpose is to optimize the direction of light; the fourth lens to the eighth lens are used to balance and correct aberrations, so as to realize a design with a shorter focal length and a larger field of view; and the conditional formula is satisfied at the same time, by limiting the ratio of the effective focal length of the first optical system and the second optical system to the effective focal length of the first lens, the size and optical performance of the first optical system and the second optical system are respectively allocated, so as to ensure the compact design and functional combination of the system, and the second optical system recognizes the changes in the external environment of the user, so as to calculate the changes in the spatial positioning of the user, and adjusts the display screen of the first optical system in real time according to the changes, so as to realize the spatial interaction effect of the virtual reality device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0033] Figure 1 A schematic plan view of a virtual reality device according to an exemplary embodiment of the present application is shown;

[0034] Figure 2A A front perspective schematic diagram of a virtual reality device according to an exemplary embodiment of the present application is shown;

[0035] Figure 2B A reverse perspective schematic diagram of a virtual reality device according to an exemplary embodiment of the present application is shown;

[0036] Figure 3 A schematic diagram showing a first optical system of a virtual reality device according to Embodiment 1 of the present application is shown;

[0037] FIG. 4A to FIG. 4C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system of the virtual reality device according to the first embodiment of the present application are respectively shown;

[0038] Figure 5 A schematic diagram showing a first optical system of a virtual reality device according to Embodiment 2 of the present application is shown;

[0039] FIG. 6A to FIG. 6C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system of the virtual reality device according to the second embodiment of the present application are respectively shown;

[0040] Figure 7 A schematic diagram showing a first optical system of a virtual reality device according to Embodiment 3 of the present application is shown;

[0041] FIG. 8A to FIG. 8C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system of the virtual reality device according to the third embodiment of the present application are respectively shown;

[0042] Fig. 9 A schematic diagram showing a first optical system of a virtual reality device according to a fourth embodiment of the present application is shown;

[0043] FIG. 10A to FIG. 10C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system of the virtual reality device according to the fourth embodiment of the present application are respectively shown;

[0044] Fig.11 A schematic diagram showing a second optical system of a virtual reality device according to a fifth embodiment of the present application is shown;

[0045] Fig. 12A and Fig. 12B The axial chromatic aberration curve and the astigmatism curve of the second optical system of the virtual reality device according to the fifth embodiment of the present application are respectively shown;

[0046] Fig.13 A schematic diagram showing a second optical system of a virtual reality device according to a sixth embodiment of the present application is shown;

[0047] Fig.14A and Fig. 14B The axial chromatic aberration curve and the astigmatism curve of the second optical system of the virtual reality device according to the sixth embodiment of the present application are respectively shown;

[0048] Fig.15 A schematic diagram showing a second optical system of a virtual reality device according to Embodiment 7 of the present application; and

[0049] Fig.16A and Fig. 16B The axial chromatic aberration curve and the astigmatism curve of the second optical system of the virtual reality device according to the seventh embodiment of the present application are respectively shown. DETAILED DESCRIPTION

[0050] 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 are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0051] 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 first lens.

[0052] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. 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 only examples and are not drawn strictly to scale.

[0053] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0054] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0055] 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.

[0056] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following examples only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can also be made, which all belong to the protection scope of the present application.

[0057] The features, principles and other aspects of the present application are described in detail below.

[0058] refer to Figure 1 As shown, the virtual reality device 10 according to an exemplary embodiment of the present application may include a first optical system 100 and a second optical system 200. Exemplarily, the second optical system 200 can be used to image a real scene, and the real image formed is transmitted to the information processing unit in the form of an electrical signal, and the first optical system 100 can be used to project a virtual image on a display screen. By combining the first optical system 100 with the second optical system 200, the fusion of virtual content and real scene can be achieved. The first optical system 100 provides a virtual experience, and the second optical system 200 provides a real environment, which increases boundaries and interactions while providing immersion.

[0059] The first optical system 100 may be, for example, a visual lens. In an exemplary embodiment, the visual lens may be configured as a catadioptric visual optical system; the second optical system 200 may be, for example, a positioning lens. Specifically, the positioning lens may be used to image a real scene, and the real image formed is transmitted to a display screen in the form of an electrical signal; the image plane (IMG) of the visual lens may be located on the display screen, and the visual lens may be used to project a virtual image on the display screen and the real image transmitted to the display screen, such as projecting it into the eyes of a user, so that the user can see a virtual and real picture, thereby improving the user's sense of immersion.

[0060] Combination Figure 2A and Figure 2B As shown, according to the virtual reality device 10 of the exemplary embodiment of the present application, the number of the first optical system 100 may be one or more; the number of the second optical system 200 may be one or more. In one example, the virtual reality device 10 may include two first optical systems 100 that are symmetrically arranged. In one example, the virtual reality device 10 also includes a body, the first optical system 100 may be arranged on the inner side of the body, and the second optical system 200 may be arranged on the outer side of the body. The virtual reality device 10 of the present application is not limited to only including the above-mentioned first optical system and the second optical system, that is, the virtual reality device may include 2, 3 or more optical systems. In one example, the virtual reality device 10 may also include a third optical system, and the structure of the third optical system may be different from the structure of the first optical system 100 and the second optical system 200.

[0061] In an exemplary embodiment, the first optical system 100 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, wherein there may be an air gap between the first lens and the second lens, and between the second lens and the third lens.

[0062] The first side may be the near-eye side, and the second side may be the display screen side. Accordingly, each optical element (first lens, reflective polarizing element, quarter-wave plate, second lens, third lens, etc.) in the first optical system may have a first side relatively far from the display screen side and a second side relatively close to the display screen.

[0063] In an exemplary embodiment, the reflective polarizing element may be disposed on the second side of the first lens and at least partially adhered to the second side of the first lens; the quarter-wave plate may be disposed on the second side of the reflective polarizing element and at least partially adhered to the second side of the reflective polarizing element. The quarter-wave plate may change the polarization state of polarized light, so that circularly polarized light becomes s-light or p-light. When the light passes through the reflective polarizing element, the reflective polarizing element may transmit or reflect the s-light or p-light, thereby refracting the light path and reducing the total length of the refracting optical system. The image light from the display screen is refracted and reflected multiple times by the third lens, the second lens, the quarter-wave plate, the reflective polarizing element, and the first lens, and is finally projected to the user's eyes.

[0064] In an exemplary embodiment, the first optical system 100 may further include a partial reflective element, which may be, for example, a partial reflective layer attached or plated on the second side of the third lens. The partial reflective layer has a semi-transmissive and semi-reflective effect on the light. By providing a partial reflective layer on the second side of the third lens, and combining a reflective polarizing element and a quarter-wave plate, the light can be refracted multiple times, thereby effectively reducing the main body length of the first optical system. In an exemplary embodiment, the first optical system may further include a first aperture, which may be, for example, provided between the first side of the first optical system and the first lens.

[0065] In an exemplary embodiment, the first side surface or the second side surface of the first lens, the second lens, and the third lens of the first optical system may be an aspherical surface. An aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving imaging quality.

[0066] In an exemplary embodiment, the second optical system 200 may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially arranged from the object side to the image side along the second optical axis. An air gap may be provided between adjacent two lenses of the first to eighth lenses.

[0067] In an exemplary embodiment, the first lens may have negative optical power, the second lens may have negative optical power, the third lens may have positive optical power, the fourth lens may have positive optical power, the fifth lens may have positive optical power, the sixth lens may have negative optical power, the seventh lens may have positive optical power, and the eighth lens may have positive optical power.

[0068] In an exemplary embodiment, the second optical system 200 may further include a second stop, and the second stop may be disposed, for example, between the third lens and the fourth lens.

[0069] The virtual reality device according to the above exemplary embodiment of the present application includes a first optical system and a second optical system. The first optical system is composed of three lenses, combined with a reflective polarizing element and a quarter-wave plate, to form a refracting light path to reduce the total length of the system; the second optical system is composed of eight lenses, wherein the first lens has a negative optical focal length, which is beneficial to increase the field of view of the system; the second lens and the third lens group are a combination of negative and positive lenses, the purpose of which is to optimize the direction of light; the fourth lens to the eighth lens are used to balance and correct aberrations to achieve a design with a shorter focal length and a larger field of view.

[0070] The virtual reality device 10 according to the exemplary embodiment of the present application can be used in a variety of virtual reality display devices, such as a VR head-mounted device, an MR head-mounted device, or an AR electronic device.

[0071] According to the exemplary embodiment of the present application, the virtual reality device can satisfy: -1.2<(fA / f1A) / (fB / f1B)<-0.2, where fA is the effective focal length of the first optical system, f1A is the effective focal length of the first lens in the first optical system, fB is the effective focal length of the second optical system, and f1B is the effective focal length of the first lens in the second optical system. By satisfying the above conditional formula, the ratio of the effective focal length of the first optical system and the second optical system to the effective focal length of the first lens is limited, and their sizes and optical performances are allocated respectively to ensure the compact design and functional combination of the system, and the changes in the user's external environment are identified by the second optical system, so as to calculate the changes in the user's spatial positioning, and adjust the display screen of the first optical system in real time according to the changes, so as to achieve the spatial interaction effect of the virtual reality device.

[0072] The virtual reality device according to the exemplary embodiment of the present application can satisfy: -2.2<(f3A / R6A)*(f8B / R16B)<-1.6, where f3A is the effective focal length of the third lens in the first optical system, R6A is the radius of curvature of the second side of the third lens in the first optical system, f8B is the effective focal length of the eighth lens in the second optical system, and R16B is the radius of curvature of the image side of the eighth lens in the second optical system. The virtual reality device includes two optical systems, and the basic architecture of the first optical system and the second optical system is reasonably set; at the same time, by satisfying the above conditional formula, the effective focal length and radius of curvature of the third lens of the first optical system and the eighth lens of the second optical system are controlled, and the curvature of the two groups of lenses is optimized, which is conducive to reducing the difficulty of lens processing and molding, and can effectively control the angle of the system output beam to meet the CRA requirements of the optical system.

[0073] In an exemplary embodiment, the virtual reality device may satisfy: 1.8 < (fA / EPDA - fB / EPDB) < 2.2, where fA is the effective focal length of the first optical system, EPDA is the entrance pupil diameter of the first optical system, fB is the effective focal length of the second optical system, and EPDB is the entrance pupil diameter of the second optical system. By satisfying the above conditional expression, the ratio of the entrance pupil diameter and the effective focal length of the first optical system and the second optical system is controlled, the F-numbers of the two optical systems are constrained, and a smaller F-number makes the light flux of the second optical system larger, ensuring the recognition ability of the second optical system in a dark environment.

[0074] In an exemplary embodiment, the virtual reality device may satisfy: 8.2 < f23A / (CT2A + T23A + CT3A) < 17.7, 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 in the first optical system on the first optical axis, T23A is the air gap on the first optical axis between the second side surface of the second lens and the first side surface of the third lens in the first optical system, and CT3A is the central thickness of the third lens in the first optical system on the first optical axis. By satisfying the above relational expression, the central thickness and the air gap of the second and third lenses in the first optical system are allocated, while ensuring the combined optical power, and unreasonable lens shapes and optical structures are avoided.

[0075] In an exemplary embodiment, the virtual reality device may satisfy: -1.5 < R2A / fzA < -0.4, where R2A is the curvature radius of the second side surface of the first lens in the first optical system, and fzA is the combined focal length of the first lens, the reflective polarizing element, and the quarter-wave plate in the first optical system. By satisfying the above relational expression, the curvature radius of the second side surface of the first lens in the first optical system is constrained, and on the premise of ensuring the overall focal length, the curvature radius of the second side surface of the first lens is optimized to reduce the attachment process difficulty of the reflective polarizing element and the quarter-wave plate.

[0076] In an exemplary embodiment, the virtual reality device may satisfy: 1.4 < f2A / R3A < 2.3, where f2A is the effective focal length of the second lens in the first optical system, and R3A is the curvature radius of the first side surface of the second lens in the first optical system. By satisfying the above relational expression, the curvature radius of the first side surface of the second lens in the first optical system is constrained, and on the premise of satisfying the effective focal length of the second lens, the curvature radius of the first side surface of the second lens is optimized to reduce the lens forming and assembly difficulty.

[0077] In an exemplary embodiment, the virtual reality device may satisfy: 16.5mm < fA * tan(FOVA / 2) < 17.7mm, where fA is the effective focal length of the first optical system and FOVA is the maximum field of view angle of the first optical system. By satisfying the above conditional expression, the effective focal length and the maximum field of view angle of the first optical system are controlled to constrain the pupil size of the system, and a suitable system focal length is selected while satisfying the field of view angle design.

[0078] In an exemplary embodiment, the virtual reality device may satisfy: 0.1 < f2B / (R3B + R4B) < 0.5, where f2B is the effective focal length of the second lens in the second optical system, R3B is the curvature radius of the object side surface of the second lens in the second optical system, and R4B is the curvature radius of the image side surface of the second lens in the second optical system. By satisfying the above relational expression, the curvature radii of the second lens in the second optical system are constrained to optimize the light ray path, ensure the rationality of the second lens structure, and reduce the risk of stray light.

[0079] In an exemplary embodiment, the virtual reality device may satisfy: 0.8 < f3B / f7B < 1.2, where f3B is the effective focal length of the third lens in the second optical system and f7B is the effective focal length of the seventh lens in the second optical system. By satisfying the above conditional expression, the ratio of the effective focal lengths of the third lens and the seventh lens in the second optical system is controlled to optimize the overall light ray path of the second optical system and make the transition of the marginal rays smoother.

[0080] In an exemplary embodiment, the virtual reality device may satisfy: 6.0 < (f4B / CT4B) * (f5B / CT5B) < 8.2, where f4B is the effective focal length of the fourth lens in the second optical system, CT4B is the central thickness of the fourth lens in the second optical system on the second optical axis, f5B is the effective focal length of the fifth lens in the second optical system, and CT5B is the central thickness of the fifth lens in the second optical system on the second optical axis. By satisfying the above relational expression, the effective focal lengths and the central thicknesses of the fourth lens and the fifth lens in the second optical system are allocated, which is beneficial to the correction of system aberrations.

[0081] In an exemplary embodiment, the virtual reality device may satisfy: 1.3 < f6B / R11B < 1.7, where f6B is the effective focal length of the sixth lens in the second optical system and R11B is the curvature radius of the object side surface of the sixth lens in the second optical system. By satisfying the above conditional expression, the ratio of the effective focal length of the sixth lens in the second optical system to the curvature radius of its object side surface is controlled to constrain the curvature radius of its object side surface, make its structure more reasonable, and reduce the lens forming difficulty.

[0082] In an exemplary embodiment, the virtual reality device may satisfy: 4.3<(∑CTA / fA)*(∑CTB / fB)<7.0, where ∑CTA is the sum of the center thicknesses of the first lens to the third lens in the first optical system on the first optical axis, ∑CTB is the sum of the center thicknesses of the first lens to the eighth lens in the second optical system on the second optical axis, fA is the effective focal length of the first optical system, and fB is the effective focal length of the second optical system. By satisfying the above relationship, the overall thickness of the lens is constrained, making the system design thinner and lighter, which is conducive to the overall lightweighting of the system.

[0083] In an exemplary embodiment, the virtual reality device may satisfy: 2.6<(TDB / EPDB) / (TDA / EPDA)<4.5, where TDB is the distance from the object side of the first lens in the second optical system to the image side of the eighth lens on the second optical axis, EPDB is the entrance pupil diameter of the second optical system, TDA is the distance from the first side of the first lens in the first optical system to the second side of the third lens on the first optical axis, and EPDA is the entrance pupil diameter of the first optical system. By satisfying the above relationship, the overall size of the two optical systems is limited, and the system length is constrained under the premise of meeting the design aperture, which is conducive to the miniaturization of the system.

[0084] In an exemplary embodiment, the virtual reality device may satisfy: -0.3<(R5B / R6B)*(R9B / R10B)<-0.1, where R5B is the radius of curvature of the object side surface of the third lens in the second optical system, R6B is the radius of curvature of the image side surface of the third lens in the second optical system, R9B is the radius of curvature of the object side surface of the fifth lens in the second optical system, and R10B is the radius of curvature of the image side surface of the fifth lens in the second optical system. By satisfying the above conditional formula, the radius of curvature of the surfaces of the third lens and the fifth lens in the second optical system is controlled, the direction of light from the third lens to the fifth lens is optimized, the risk of stray light of the lens is reduced, and the lens morphology is controlled to reduce the difficulty of lens molding.

[0085] According to the virtual reality device of the above-mentioned embodiment of the present application, by reasonably setting the parameters such as the radius of curvature, center thickness, surface shape, refractive index and Abbe number of each optical element, as well as the total effective focal length of the virtual reality device, it is helpful to improve the imaging effect and ensure the optical performance of the system; and by reasonably setting the parameters such as the aperture position, the air gap between lenses, and the distance to the display or the imaging surface, it is helpful to ensure the molding and strength of the lens and reduce the sensitivity of the lens; at the same time, it is helpful to constrain the total length of the optical system and improve the portability of the equipment; it can also increase the field of view angle and improve the user experience.

[0086] Specific embodiments of the virtual reality device applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0087] Embodiment 1

[0088] The following reference Figures 3 to 4C The first optical system according to the first embodiment of the present application is described.

[0089] like Figure 3 As shown, the first optical system of this embodiment includes: a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2' and a third lens E3' arranged in sequence from the near-eye side to the display side along the first optical axis. A display screen may be disposed on the second side of the first optical system.

[0090] In this embodiment, the first lens E1' has positive power, and its first side surface S2' is a convex surface, and its second side surface S3' is a convex surface. The reflective polarizing element RP and the quarter-wave plate QWP are disposed on the second side surface S3' of the first lens E1'. Exemplarily, the reflective polarizing element RP is at least partially bonded to the second side surface S3' of the first lens E1', and the quarter-wave plate QWP is at least partially bonded to the second side surface of the reflective polarizing element RP.

[0091] The second lens E2' has negative optical power, and its first side surface S6' is a concave surface, and its second side surface S7' is a convex surface.

[0092] The third lens E3' has positive power, and its first side surface S8' is a convex surface, and its second side surface S9' is a convex surface.

[0093] In this embodiment, the first optical system may further include a first aperture STO1 , and the first aperture STO1 may be disposed at a first side of the first optical system.

[0094] In this embodiment, the first optical system may further include a partial reflective element BS. The partial reflective element BS may be disposed on the second side surface S9 ′ of the third lens E3 ′.

[0095] As an exemplary embodiment, the image light from the display screen can sequentially pass through 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, and pass through the quarter wave plate QWP, the second lens E2' and the third lens E3' again to reach the partial reflective element BS, and then the light beam is reflected again at the partial reflective element BS and 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 be emitted toward the side of the human eye. According to the first optical system provided in the embodiment of the present application, the required optical path is folded without affecting the projection quality by combining light reflection and refraction, effectively shortening the main body length of the optical system.

[0096] Table 1 shows the basic parameters of the first optical system of the first embodiment, wherein the units of the radius of curvature and thickness / distance are all in millimeters (mm). The image light from the image plane IMG passes through the optical elements in the order of sequence number 20 to sequence number 1 and is finally projected into the human eye.

[0097]

[0098]

[0099] Table 1

[0100] 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 shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0101]

[0102] Wherein, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspherical 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, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0103] Coefficient / surface number S2' S3' S6' S7' S8' S9' A4 -2.3507E-01 1.6857E-01 -4.4543E-01 -2.3022E-01 -6.4525E-01 6.3214E-03 A6 -7.2111E-02 1.5702E-02 2.4933E-02 1.5647E-01 1.5977E-01 -1.1485E-02 A8 -4.9613E-02 1.5198E-03 -1.3528E-03 -2.4706E-01 -1.1449E-01 -1.2245E-03 A10 -5.2795E-04 -6.4110E-04 2.6530E-03 3.1457E-02 1.5670E-02 0.0000E+00 A12 -7.3031E-03 -2.8373E-03 -7.6516E-03 -3.8328E-04 6.5357E-03 0.0000E+00 A14 1.7584E-04 1.3518E-04 1.9565E-03 -9.1639E-03 -4.8091E-03 0.0000E+00 A16 -4.7630E-04 1.1613E-04 1.7073E-03 2.8351E-03 1.2567E-03 0.0000E+00 A18 0.0000E+00 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 0.0000E+00

[0104] Table 2

[0105] Figure 4A The axial chromatic aberration curve of the first optical system of this embodiment is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the first optical system. Figure 4B The astigmatism curve of the first optical system of this embodiment is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 4C The distortion curve of the first optical system of this embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. FIG. 4A to FIG. 4C It can be seen that the first optical system provided in the first embodiment can achieve good imaging quality.

[0106] Embodiment 2

[0107] The following reference Figures 5 to 6C The first optical system according to the second embodiment of the present application is described. Figure 5 The schematic diagram of the structure of the second optical system according to the second embodiment of the present application is shown. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to the first embodiment will be omitted.

[0108] like Figure 5 As shown, the first optical system of this embodiment includes: a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2' and a third lens E3' arranged in sequence from the near-eye side to the display side along the first optical axis. A display screen may be disposed on the second side of the first optical system.

[0109] In this embodiment, the first lens E1' has positive power, its first side surface S2' is concave, and its second side surface S3' is convex. The reflective polarizing element RP and the quarter wave plate QWP are disposed on the second side surface S3' of the first lens E1'.

[0110] The second lens E2' has negative optical power, a first side surface S6' thereof is a concave surface, and a second side surface S7' thereof is a flat surface.

[0111] The third lens E3' has positive refractive power, a first side surface S8' thereof is a plane, and a second side surface S9' is a convex surface.

[0112] In this embodiment, the first optical system may further include a first aperture STO1 disposed on the first side, and a partial reflection element BS disposed on the second side surface S9 ′ of the third lens E3 ′.

[0113] Table 3 shows the basic parameter table of the first optical system of the second embodiment, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0114] Face number Optical Components Surface type Radius of curvature thickness Refractive Index Abbe number Refraction / Reflection 0 Spherical endless -1290.0000 refraction 1 Aperture (STO1) Spherical endless 12.0000 refraction 2 First lens (E1') Aspheric -500.0000 3.8000 1.546 55.92 refraction 3 Reflective polarizer (RP) Aspheric -80.0000 0.1000 1.502 56.00 refraction 4 Quarter Wave Plate (QWP) Aspheric -80.0000 0.1000 1.502 56.00 refraction 5 Aspheric -80.0000 0.2500 refraction 6 Second lens (E2') Aspheric -67.2561 0.8998 1.645 23.52 refraction 7 Spherical endless 0.0000 refraction 8 Third lens (E3') Spherical endless 8.2802 1.546 55.92 refraction 9 Partially reflective element (BS) Aspheric -36.6342 -8.2802 1.546 55.92 reflection 10 Spherical endless 0.0000 refraction 11 Second lens (E2') Spherical endless -0.8998 refraction 12 Aspheric -67.2561 -0.2500 refraction 13 Quarter Wave Plate (QWP) Aspheric -80.0000 -0.1000 1.502 56.00 refraction 14 Reflective polarizer (RP) Aspheric -80.0000 0.1000 1.502 56.00 reflection 15 Aspheric -80.0000 0.2500 refraction 16 Second lens (E2') Aspheric -67.2561 0.8998 1.645 23.52 refraction 17 Spherical endless 0.0000 refraction 18 Third lens (E3') Spherical endless 8.2802 1.546 55.92 refraction 19 Aspheric -36.6342 0.8456 refraction 20 Image surface (IMG) Spherical endless 0.0000 refraction

[0115] Table 3

[0116] In this embodiment, the first side surface S2' and the second side surface S3' of the first lens E1', the first side surface S6' of the second lens E2', and the second side surface S9' of the third lens E3' are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by the aspherical surface formula (1) in the first embodiment but is not limited thereto.

[0117] 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, A 10 , A 12 , A 14 , A 16 , A 18 and A 20.

[0118]

[0119]

[0120] Table 4

[0121] Fig. 6A The axial chromatic aberration curve of the first optical system of this embodiment is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the first optical system. Figure 6B The astigmatism curve of the first optical system of this embodiment is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 6C The distortion curve of the first optical system of this embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. FIG. 6A to FIG. 6C It can be seen that the first optical system provided in the second embodiment can achieve good imaging quality.

[0122] Embodiment 3

[0123] The following reference Figures 7 to 8C The first optical system according to the third embodiment of the present application is described. Figure 7 A schematic structural diagram of a first optical system according to Embodiment 3 of the present application is shown.

[0124] like Figure 7 As shown, the first optical system of this embodiment includes: a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2' and a third lens E3' arranged in sequence from the near-eye side to the display side along the first optical axis. A display screen may be disposed on the second side of the first optical system.

[0125] In this embodiment, the first lens E1' has positive power, its first side surface S2' is convex, and its second side surface S3' is convex. The reflective polarizing element RP and the quarter wave plate QWP are disposed on the second side surface S3' of the first lens E1'.

[0126] The second lens E2' has negative optical power, and its first side surface S6' is a concave surface, and its second side surface S7' is a concave surface.

[0127] The third lens E3' has positive power, and its first side surface S8' is a convex surface, and its second side surface S9' is a convex surface.

[0128] In this embodiment, the first optical system may further include a first aperture STO1 disposed on the first side, and a partial reflection element BS disposed on the second side surface S9 ′ of the third lens E3 ′.

[0129] Table 5 shows a basic parameter table of the first optical system of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0130]

[0131]

[0132] Table 5

[0133] 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 shape x of each aspherical lens can be defined by the aspherical formula (1) in the first embodiment but is not limited to it.

[0134] 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, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0135] Coefficient / surface number S2' S3' S6' S7' S8' S9' A4 -4.8524E-01 1.3422E-01 -3.4535E-01 -9.7724E-01 -9.7724E-01 6.3214E-03 A6 -8.1530E-02 2.4111E-02 1.3235E-02 1.2301E-01 1.2301E-01 -1.1485E-02 A8 -4.8933E-02 2.1013E-04 1.3069E-01 -2.1000E-01 -2.1000E-01 -1.2245E-03 A10 1.0052E-02 -6.2016E-03 -3.5501E-02 6.4941E-02 6.4941E-02 0.0000E+00 A12 -1.1256E-02 -2.7975E-03 3.8362E-03 -1.6673E-02 -1.6673E-02 0.0000E+00 A14 1.9505E-03 4.9328E-04 1.7737E-04 2.5460E-03 2.5460E-03 0.0000E+00 A16 -8.1676E-04 3.3116E-04 -2.8648E-04 1.6000E-03 1.6000E-03 0.0000E+00 A18 0.0000E+00 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 0.0000E+00

[0136] Table 6

[0137] Fig. 8A The axial chromatic aberration curve of the first optical system of this embodiment is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the first optical system. Figure 8B The astigmatism curve of the first optical system of this embodiment is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 8C The distortion curve of the first optical system of this embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. FIG. 8A to FIG. 8C It can be seen that the first optical system provided in the third embodiment can achieve good imaging quality.

[0138] Embodiment 4

[0139] The following reference Figures 9 to 10C Describe the first optical system according to the fourth embodiment of the present application. Fig. 9 A schematic structural diagram of a first optical system according to Embodiment 4 of the present application is shown.

[0140] like Fig. 9As shown, the first optical system of this embodiment includes: a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2' and a third lens E3' arranged in sequence from the near-eye side to the display side along the first optical axis. A display screen may be disposed on the second side of the first optical system.

[0141] In this embodiment, the first lens E1' has positive power, its first side surface S2' is concave, and its second side surface S3' is convex. The reflective polarizing element RP and the quarter wave plate QWP are disposed on the second side surface S3' of the first lens E1'.

[0142] The second lens E2' has positive power, a first side surface S6' thereof is a convex surface, and a second side surface S7' thereof is a flat surface.

[0143] The third lens E3' has positive refractive power, a first side surface S8' thereof is a plane, and a second side surface S9' is a convex surface.

[0144] In this embodiment, the first optical system may further include a first aperture STO1 disposed on the first side, and a partial reflection element BS disposed on the second side surface S9 ′ of the third lens E3 ′.

[0145] Table 7 shows a basic parameter table of the first optical system of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0146] Face number Optical Components Surface type Radius of curvature thickness Refractive Index Abbe number Refraction / Reflection 0 Spherical endless -1290.0000 refraction 1 Aperture (STO1) Spherical endless 12.0000 refraction 2 First lens (E1') Aspheric -500.0000 3.3550 1.546 55.92 refraction 3 Reflective polarizer (RP) Aspheric -109.7362 0.1000 1.502 56.00 refraction 4 Quarter Wave Plate (QWP) Aspheric -109.7362 0.1000 1.502 56.00 refraction 5 Aspheric -109.7362 0.2500 refraction 6 Second lens (E2') Aspheric 1118.8427 0.9396 1.546 55.92 refraction 7 Spherical endless 0.0000 refraction 8 Third lens (E3') Spherical endless 8.3494 1.546 55.92 refraction 9 Partially reflective element (BS) Aspheric -43.3262 -8.3494 1.546 55.92 reflection 10 Spherical endless 0.0000 refraction 11 Second lens (E2') Spherical endless -0.9396 refraction 12 Aspheric 1118.8427 -0.2500 refraction 13 Quarter Wave Plate (QWP) Aspheric -109.7362 -0.1000 1.502 56.00 refraction 14 Reflective polarizer (RP) Aspheric -109.7362 0.1000 1.502 56.00 reflection 15 Aspheric -109.7362 0.2500 refraction 16 Second lens (E2') Aspheric 1118.8427 0.9396 1.546 55.92 refraction 17 Spherical endless 0.0000 refraction 18 Third lens (E3') Spherical endless 8.3494 1.546 55.92 refraction 19 Aspheric -43.3262 0.8644 refraction 20 Image surface (IMG) Spherical endless 0.0000 refraction

[0147] Table 7

[0148] In this embodiment, the first side surface S2' and the second side surface S3' of the first lens E1', the first side surface S6' of the second lens E2', and the second side surface S9' of the third lens E3' are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by the aspherical surface formula (1) in the first embodiment but is not limited thereto.

[0149] 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, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0150] Coefficient / surface number S2' S3' S6' S9' A4 -1.1214E+00 -5.2510E-01 -1.7966E-01 6.3214E-03 A6 -3.3129E-01 1.3365E-01 1.0059E-01 -1.1485E-02 A8 -9.6209E-02 -3.2642E-02 1.7702E-02 -1.2245E-03 A10 -2.3497E-02 1.2198E-02 -1.4597E-02 0.0000E+00 A12 -1.5886E-02 -5.6791E-03 2.2334E-03 0.0000E+00 A14 2.7230E-04 1.7956E-03 -3.3570E-03 0.0000E+00 A16 -2.1414E-03 -2.8782E-04 6.0729E-04 0.0000E+00 A18 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

[0151] Table 8

[0152] Fig. 10A The axial chromatic aberration curve of the first optical system of this embodiment is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the first optical system. Fig. 10B The astigmatism curve of the first optical system of this embodiment is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Fig. 10C The distortion curve of the first optical system of this embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. FIG. 10A to FIG. 10C It can be seen that the first optical system provided in the fourth embodiment can achieve good imaging quality.

[0153] A specific embodiment of the second optical system applicable to the virtual reality device of the above-mentioned embodiment will be further described below with reference to the accompanying drawings.

[0154] Embodiment 5

[0155] The following reference Figures 11 to 12B The second optical system according to the fifth embodiment of the present application is described. Fig.11 A schematic structural diagram of a second optical system according to Embodiment 5 of the present application is shown.

[0156] like Fig.11 As shown, the second optical system may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and an eighth lens E8 arranged in sequence from the object side to the image side along the second optical axis.

[0157] In this embodiment, the first lens E1 has negative focal power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, its object side surface S11 is concave, and its image side surface S12 is concave. The seventh lens E7 has positive focal power, its object side surface S13 is convex, and its image side surface S14 is convex. The eighth lens E8 has positive focal power, its object side surface S15 is convex, and its image side surface S16 is concave.

[0158] As an exemplary embodiment, the second optical system may further include a second aperture STO2 and a filter E9. The second aperture STO2 may be disposed, for example, between the third lens E3 and the fourth lens E4. The filter E9 may be disposed, for example, between the image side surface S16 of the eighth lens E8 and the imaging surface S19 of the second optical system. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S19.

[0159] Table 9 shows the 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). Light from an object passes through each surface S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0160]

[0161]

[0162] Table 9

[0163] In this embodiment, the object side surface and the image side surface of any lens from the second lens E2 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the formula (1) given in the first embodiment.

[0164] Table 10 shows the high-order coefficients A4, A6, A8, A9 of each aspherical mirror surface S3-S16 in the second optical system that can be used in Example 5. 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0165] Face number A4 A6 A8 A10 A12 A14 A16 S3 -2.2049E-03 -2.0385E-03 7.4554E-03 -5.7362E-03 2.5975E-03 -8.1031E-04 1.8196E-04 S4 -5.0660E-02 1.5708E-01 -5.2562E-01 9.4047E-01 -1.0565E+00 7.6856E-01 -3.4504E-01 S5 8.1894E-04 1.1981E-01 -4.2848E-01 8.5038E-01 -1.0905E+00 9.4404E-01 -5.4777E-01 S6 5.5890E-02 -5.6254E-02 2.6579E-01 -6.4791E-01 9.8657E-01 -9.2019E-01 5.1407E-01 S7 2.8780E-02 -2.5188E-01 9.0098E-01 -1.8753E+00 2.3994E+00 -1.9140E+00 9.2755E-01 S8 -3.7943E-03 1.3325E-02 -9.0883E-03 -2.1267E-02 7.3060E-02 -1.0145E-01 8.0518E-02 S9 -1.7275E-02 2.6576E-02 -4.2572E-02 5.2426E-02 -4.5091E-02 2.6608E-02 -1.0719E-02 S10 -1.0443E-01 1.8438E-01 -2.9327E-01 3.7294E-01 -3.8161E-01 3.2715E-01 -2.2772E-01 S11 7.2473E-02 5.6333E-02 -1.9693E-01 2.6892E-01 -2.5852E-01 2.0991E-01 -1.4536E-01 S12 9.0620E-02 -1.5558E-01 2.7454E-01 -3.5316E-01 3.1768E-01 -2.0491E-01 9.6887E-02 S13 -1.4457E-02 -1.7605E-01 4.5753E-01 -6.5139E-01 6.1832E-01 -4.1653E-01 2.0460E-01 S14 -1.3907E-02 -5.9740E-02 1.3741E-01 -2.0829E-01 2.2782E-01 -1.7634E-01 9.6883E-02 S15 -4.1668E-02 3.6873E-02 -7.6031E-02 9.0075E-02 -6.7214E-02 3.4011E-02 -1.2138E-02 S16 6.1567E-02 -6.0546E-02 1.9358E-02 6.7038E-03 -1.1915E-02 7.2975E-03 -2.7377E-03 Face number A18 A20 A22 A24 A26 A28 A30 S3 -2.9397E-05 3.3225E-06 -2.4818E-07 1.0962E-08 -2.1614E-10 0.0000E+00 0.0000E+00 S4 8.3291E-02 -5.4532E-03 -1.7135E-03 2.8197E-04 0.0000E+00 0.0000E+00 0.0000E+00 S5 2.0903E-01 -5.0555E-02 7.0946E-03 -4.4662E-04 0.0000E+00 0.0000E+00 0.0000E+00 S6 -1.5709E-01 2.0035E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -2.4986E-01 2.8701E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -3.9008E-02 1.1415E-02 -1.8561E-03 1.2886E-04 0.0000E+00 0.0000E+00 0.0000E+00 S9 2.8966E-03 -5.0179E-04 5.0288E-05 -2.2120E-06 0.0000E+00 0.0000E+00 0.0000E+00 S10 1.2106E-01 -4.7089E-02 1.3042E-02 -2.4974E-03 3.1430E-04 -2.3415E-05 7.8341E-07 S11 7.9026E-02 -3.1585E-02 8.9593E-03 -1.7500E-03 2.2405E-04 -1.6962E-05 5.7681E-07 S12 -3.3942E-02 8.8043E-03 -1.6696E-03 2.2499E-04 -2.0396E-05 1.1146E-06 -2.7712E-08 S13 -7.4035E-02 1.9706E-02 -3.8086E-03 5.1956E-04 -4.7400E-05 2.5938E-06 -6.4354E-08 S14 -3.8103E-02 1.0757E-02 -2.1619E-03 3.0195E-04 -2.7856E-05 1.5263E-06 -3.7617E-08 S15 3.1166E-03 -5.7879E-04 7.7097E-05 -7.1829E-06 4.4444E-07 -1.6406E-08 2.7339E-10 S16 6.9738E-04 -1.2466E-04 1.5699E-05 -1.3678E-06 7.8585E-08 -2.6814E-09 4.1171E-11

[0166] Table 10

[0167] Fig. 12A The axial chromatic aberration curve of the second optical system of this embodiment is shown, which indicates that the light of different wavelengths deviates from the focal point after passing through the positioning lens. Fig. 12B Graphs showing the astigmatism curves of the second optical system of this embodiment represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Fig. 12A and Fig. 12B It can be seen that the second optical system provided in the fifth embodiment can achieve good imaging quality.

[0168] Embodiment 6

[0169] The following reference Figures 13 to 14B The second optical system according to the sixth embodiment of the present application is described. Fig.13 A schematic structural diagram of a second optical system according to Embodiment 6 of the present application is shown.

[0170] like Fig.13As shown, the second optical system may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and an eighth lens E8 arranged in sequence from the object side to the image side along the second optical axis.

[0171] In this embodiment, the first lens E1 has negative focal power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive focal power, its object side surface S13 is convex, and its image side surface S14 is concave. The eighth lens E8 has positive focal power, its object side surface S15 is convex, and its image side surface S16 is concave.

[0172] The second optical system may further include a second aperture STO2 and a filter E9. The second aperture STO2 may be disposed, for example, between the third lens E3 and the fourth lens E4. The filter E9 may be disposed, for example, between the image side surface S16 of the eighth lens E8 and the imaging surface S19 of the second optical system. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S19.

[0173] Table 11 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). Light from an object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0174] Face number Surface type Radius of curvature Thickness / distance Refractive Index Abbe number Cone coefficient OBJ Spherical endless 950.0000 S1 Spherical 7.6407 0.6753 1.77 49.61 S2 Spherical 2.7900 2.1967 S3 Aspheric -9.5000 0.4414 1.54 56.11 6.6599 S4 Aspheric 1.8458 0.1857 0.0022 S5 Aspheric 2.9011 0.7109 1.67 19.24 1.6424 S6 Aspheric 8.5911 0.7832 46.8480 STO2 Spherical endless 0.1626 S7 Aspheric -9.3555 1.3038 1.54 56.11 -47.8398 S8 Aspheric -2.1121 0.3080 0.0309 S9 Aspheric 4.3631 1.9083 1.62 63.88 0.4832 S10 Aspheric -5.8257 0.1267 0.4062 S11 Aspheric -1.8300 0.4903 1.67 19.24 -1.0555 S12 Aspheric -21.7834 0.0193 57.0468 S13 Aspheric 3.2756 0.9877 1.54 56.11 0.2992 S14 Aspheric 30.5994 0.1107 99.9000 S15 Aspheric 1.4752 0.8842 1.54 55.65 -1.2552 S16 Aspheric 3.8435 0.8583 0.3316 S17 Spherical endless 0.1995 1.52 64.17 S18 Spherical endless 0.4655 S19 Spherical endless

[0175] Table 11

[0176] In this embodiment, the object side surface and the image side surface of any lens from the second lens E2 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the formula (1) given in the first embodiment.

[0177] Table 12 shows the high-order coefficients A4, A6, A8, A9 of each aspherical mirror surface S3-S16 in the second optical system that can be used in Example 6. 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A22 , A 24 , A 26 , A 28 and A 30 .

[0178] Face number A4 A6 A8 A10 A12 A14 A16 S3 1.9987E-02 -1.6848E-02 1.1134E-02 -2.2323E-03 -2.4485E-03 2.4963E-03 -1.1952E-03 S4 -5.0110E-02 6.2263E-01 -3.6739E+00 1.3123E+01 -3.1226E+01 5.1782E+01 -6.1288E+01 S5 2.3432E-02 5.8218E-02 -5.4002E-01 2.7098E+00 -8.3554E+00 1.7106E+01 -2.4144E+01 S6 5.2119E-02 -1.5136E-01 1.6432E+00 -9.8676E+00 3.8576E+01 -1.0325E+02 1.9520E+02 S7 1.2812E-02 -1.3419E-01 6.1118E-01 -1.7113E+00 3.1608E+00 -3.9713E+00 3.4317E+00 S8 -6.2137E-03 3.2400E-02 -8.7964E-02 1.6088E-01 -1.9338E-01 1.5572E-01 -8.4430E-02 S9 -1.5919E-02 2.9486E-02 -5.9112E-02 8.4854E-02 -8.4951E-02 6.0790E-02 -3.1632E-02 S10 -4.0138E-02 -5.6636E-02 3.1177E-01 -5.7356E-01 5.9120E-01 -3.8443E-01 1.6582E-01 S11 3.2474E-02 4.0008E-02 1.0180E-01 -3.7124E-01 4.8048E-01 -3.5872E-01 1.7516E-01 S12 3.7724E-03 -6.2199E-03 1.7303E-01 -3.6198E-01 3.9588E-01 -2.8029E-01 1.3856E-01 S13 8.1641E-03 -1.6852E-01 3.5812E-01 -4.4539E-01 3.7008E-01 -2.1728E-01 9.2866E-02 S14 1.6613E-01 -5.5545E-01 7.9649E-01 -7.3807E-01 4.8203E-01 -2.2864E-01 7.9778E-02 S15 1.2515E-01 -3.9724E-01 5.3906E-01 -4.8697E-01 3.0946E-01 -1.4157E-01 4.7324E-02 S16 6.9940E-02 -6.1026E-02 8.4757E-03 1.0427E-02 -6.4209E-03 1.2153E-03 2.8799E-04 Face number A18 A20 A22 A24 A26 A28 A30 S3 3.6438E-04 -7.6028E-05 1.1042E-05 -1.1013E-06 7.2059E-08 -2.7880E-09 4.8359E-11 S4 5.2394E+01 -3.2403E+01 1.4352E+01 -4.4360E+00 9.0824E-01 -1.1064E-01 6.0673E-03 S5 2.4007E+01 -1.6962E+01 8.4714E+00 -2.9238E+00 6.6340E-01 -8.9016E-02 5.3500E-03 S6 -2.6495E+02 2.5927E+02 -1.8136E+02 8.8471E+01 -2.8592E+01 5.5027E+00 -4.7751E-01 S7 -2.0246E+00 7.9262E-01 -1.9370E-01 2.6010E-02 -1.3839E-03 0.0000E+00 0.0000E+00 S8 3.0389E-02 -6.9552E-03 9.1579E-04 -5.2800E-05 0.0000E+00 0.0000E+00 0.0000E+00 S9 1.2062E-02 -3.3657E-03 6.7866E-04 -9.6185E-05 9.0828E-06 -5.1279E-07 1.3088E-08 S10 -4.8185E-02 9.2546E-03 -1.0806E-03 5.3441E-05 3.2352E-06 -5.9128E-07 2.4221E-08 S11 -5.8969E-02 1.3982E-02 -2.3347E-03 2.6874E-04 -2.0255E-05 8.9524E-07 -1.7428E-08 S12 -4.9358E-02 1.2784E-02 -2.3894E-03 3.1422E-04 -2.7592E-05 1.4527E-06 -3.4689E-08 S13 -2.9266E-02 6.8005E-03 -1.1509E-03 1.3791E-04 -1.1088E-05 5.3648E-07 -1.1806E-08 S14 -2.0534E-02 3.8756E-03 -5.2802E-04 5.0377E-05 -3.1831E-06 1.1922E-07 -1.9951E-09 S15 -1.1639E-02 2.1014E-03 -2.7495E-04 2.5353E-05 -1.5613E-06 5.7619E-08 -9.6345E-10 S16 -2.3465E-04 6.8461E-05 -1.1848E-05 1.3129E-06 -9.1891E-08 3.7173E-09 -6.6421E-11

[0179] Table 12

[0180] Fig.14A The axial chromatic aberration curve of the second optical system of this embodiment is shown, which indicates that the light of different wavelengths deviates from the focal point after passing through the positioning lens. Fig. 14B Graphs showing the astigmatism curves of the second optical system of this embodiment represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Fig.14A and Fig. 14B It can be seen that the second optical system provided in Example 6 can achieve good imaging quality.

[0181] Embodiment 7

[0182] The following reference Figures 15 to 16B The second optical system according to the seventh embodiment of the present application is described. Fig.15 A schematic structural diagram of a second optical system according to Embodiment 7 of the present application is shown.

[0183] like Fig.15 As shown, the second optical system may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and an eighth lens E8 arranged in sequence from the object side to the image side along the second optical axis.

[0184] In this embodiment, the first lens E1 has negative focal power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive focal power, its object side surface S13 is convex, and its image side surface S14 is concave. The eighth lens E8 has positive focal power, its object side surface S15 is convex, and its image side surface S16 is concave.

[0185] The second optical system may further include a second aperture STO2 and a filter E9. The second aperture STO2 may be disposed, for example, between the third lens E3 and the fourth lens E4. The filter E9 may be disposed, for example, between the image side surface S16 of the eighth lens E8 and the imaging surface S19 of the second optical system. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S19.

[0186] Table 13 shows the 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). Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0187] Face number Surface type Radius of curvature Thickness / distance Refractive Index Abbe number Cone coefficient OBJ Spherical endless 1050.0000 S1 Spherical 11.8357 2.5886 1.77 49.61 S2 Spherical 3.0555 2.3862 S3 Aspheric -9.6466 0.5399 1.54 56.11 5.7503 S4 Aspheric 2.0880 0.1627 -0.0322 S5 Aspheric 3.2999 0.7782 1.67 19.24 1.7235 S6 Aspheric 8.9987 0.9472 43.4738 STO2 Spherical endless 0.1739 S7 Aspheric 52.5000 1.8927 1.54 56.11 99.9000 S8 Aspheric -2.5780 0.1953 0.0227 S9 Aspheric 4.5288 1.9001 1.62 63.88 0.3975 S10 Aspheric -7.1885 0.1582 0.4222 S11 Aspheric -2.0271 0.4207 1.67 19.24 -1.0552 S12 Aspheric -52.0245 0.0485 -65.4042 S13 Aspheric 3.5621 0.9717 1.54 56.11 0.2686 S14 Aspheric 33.2038 0.0750 -8.2894 S15 Aspheric 1.6241 0.8989 1.54 55.65 -1.2961 S16 Aspheric 4.1390 0.8771 0.0289 S17 Spherical endless 0.2205 1.52 64.17 S18 Spherical endless 0.5145 S19 Spherical endless

[0188] Table 13

[0189] In this embodiment, the object side surface and the image side surface of any lens from the second lens E2 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the formula (1) given in the first embodiment.

[0190] Table 14 shows the high-order coefficients A4, A6, A8, A9 of the aspherical mirrors S3-S16 in the second optical system that can be used in Example 7. 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0191] Face number A4 A6 A8 A10 A12 A14 A16 S3 2.3075E-02 -1.3215E-02 -1.5977E-03 1.3259E-02 -1.3665E-02 8.0023E-03 -3.1235E-03 S4 -3.4953E-02 4.0420E-01 -2.0887E+00 6.5686E+00 -1.4225E+01 2.2087E+01 -2.4951E+01 S5 1.2825E-02 1.5439E-01 -8.1531E-01 2.7918E+00 -6.6501E+00 1.1349E+01 -1.3976E+01 S6 8.5234E-02 -5.3309E-01 4.7601E+00 -2.6387E+01 9.8716E+01 -2.5897E+02 4.8763E+02 S7 1.6702E-02 -9.9874E-02 4.4477E-01 -1.2421E+00 2.3199E+00 -2.9871E+00 2.6833E+00 S8 -1.1428E-02 4.2540E-02 -8.6772E-02 1.2351E-01 -1.1801E-01 7.6417E-02 -3.3571E-02 S9 -1.8541E-02 3.2783E-02 -5.9768E-02 7.7211E-02 -6.8925E-02 4.3584E-02 -1.9882E-02 S10 -3.5617E-02 -1.0241E-01 4.4067E-01 -7.8940E-01 8.2506E-01 -5.5582E-01 2.5351E-01 S11 4.1043E-02 9.7340E-03 2.4036E-01 -6.6058E-01 8.3083E-01 -6.3467E-01 3.2490E-01 S12 -9.9476E-03 5.2446E-02 7.7014E-02 -2.6291E-01 3.2517E-01 -2.4418E-01 1.2534E-01 S13 -3.0978E-03 -1.0434E-01 1.9533E-01 -2.1361E-01 1.5686E-01 -8.2097E-02 3.1742E-02 S14 1.7887E-01 -5.6304E-01 7.4615E-01 -6.2897E-01 3.6801E-01 -1.5296E-01 4.4974E-02 S15 1.2111E-01 -3.9069E-01 5.0623E-01 -4.4336E-01 2.7837E-01 -1.2764E-01 4.3262E-02 S16 7.3339E-02 -1.9239E-02 -9.2785E-02 1.2891E-01 -9.4329E-02 4.6091E-02 -1.6017E-02 Face number A18 A20 A22 A24 A26 A28 A30 S3 8.5603E-04 -1.6758E-04 2.3360E-05 -2.2670E-06 1.4563E-07 -5.5686E-09 9.5958E-11 S4 2.0619E+01 -1.2433E+01 5.4014E+00 -1.6440E+00 3.3229E-01 -4.0030E-02 2.1736E-03 S5 1.2461E+01 -8.0268E+00 3.6921E+00 -1.1808E+00 2.4922E-01 -3.1187E-02 1.7518E-03 S6 -6.6658E+02 6.6197E+02 -4.7237E+02 2.3586E+02 -7.8174E+01 1.5445E+01 -1.3761E+00 S7 -1.6760E+00 7.1269E-01 -1.9659E-01 3.1695E-02 -2.2657E-03 0.0000E+00 0.0000E+00 S8 9.8409E-03 -1.8404E-03 1.9841E-04 -9.3751E-06 0.0000E+00 0.0000E+00 0.0000E+00 S9 6.6012E-03 -1.5937E-03 2.7636E-04 -3.3478E-05 2.6846E-06 -1.2779E-07 2.7280E-09 S10 -8.0083E-02 1.7550E-02 -2.6094E-03 2.4794E-04 -1.2943E-05 1.9577E-07 7.3999E-09 S11 -1.1661E-01 2.9897E-02 -5.4699E-03 6.9934E-04 -5.9445E-05 3.0199E-06 -6.9363E-08 S12 -4.5994E-02 1.2244E-02 -2.3529E-03 3.1867E-04 -2.8888E-05 1.5743E-06 -3.9014E-08 S13 -9.2269E-03 2.0213E-03 -3.2976E-04 3.8929E-05 -3.1464E-06 1.5588E-07 -3.5703E-09 S14 -9.0313E-03 1.1115E-03 -4.7937E-05 -8.4230E-06 1.6379E-06 -1.1835E-07 3.3250E-09 S15 -1.0893E-02 2.0303E-03 -2.7619E-04 2.6631E-05 -1.7232E-06 6.7075E-08 -1.1866E-09 S16 4.0408E-03 -7.4190E-04 9.8010E-05 -9.0628E-06 5.5588E-07 -2.0286E-08 3.3292E-10

[0192] Table 14

[0193] Fig.16A The axial chromatic aberration curve of the second optical system of this embodiment is shown, which indicates that the light of different wavelengths deviates from the focal point after passing through the positioning lens. Fig. 16B Graphs showing the astigmatism curves of the second optical system of this embodiment represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Fig.16A and Fig. 16B It can be seen that the second optical system provided in the seventh embodiment can achieve good imaging quality.

[0194] Table 15-1 shows some optical parameters of the first optical system of the above-mentioned embodiments 1 to 4, and Table 15-2 shows some optical parameters of the second optical system of the above-mentioned embodiments 5 to 7. The units of the distance, thickness, and focal length are all millimeters (mm).

[0195]

[0196]

[0197] Table 15-1

[0198] Parameters / Examples five six seven f1B(mm) -7.91 -6.04 -6.10 f2B(mm) -2.37 -2.79 -3.09 f3B(mm) 4.45 6.15 7.29 f4B(mm) 3.79 4.70 4.56 f5B(mm) 3.72 4.32 4.76 f6B(mm) -2.15 -2.98 -3.12 f7B(mm) 4.04 6.63 7.23 f8B(mm) 4.98 3.95 4.43 fB(mm) 1.35 1.34 1.41 EPDB(mm) 1.23 1.16 1.23 ∑CTB(mm) 7.09 7.40 9.99 TDB(mm) 10.62 11.29 14.14

[0199] Table 15-2

[0200] The virtual reality device according to the present application can be composed of the first optical system in any one of the above embodiments and the second optical system in any one of the above embodiments. The first optical system and the second optical system can be combined in pairs to form 12 kinds of virtual reality devices, that is, the virtual reality device has 12 examples. Among them, the virtual reality device corresponding to Example 1 is composed of the first optical system of Example 1 and the second optical system of Example 5, the virtual reality device corresponding to Example 2 is composed of the first optical system of Example 1 and the second optical system of Example 6, the virtual reality device corresponding to Example 3 is composed of the first optical system of Example 1 and the second optical system of Example 7, the virtual reality device corresponding to Example 4 is composed of the first optical system of Example 2 and the second optical system of Example 5, the virtual reality device corresponding to Example 5 is composed of the first optical system of Example 2 and the second optical system of Example 6, the virtual reality device corresponding to Example 6 is composed of the first optical system of Example 2 and the second optical system of Example 7, the virtual reality device corresponding to Example 7 is composed of the first optical system of Example 3 and the second optical system of Example 5, the virtual reality device corresponding to Example 8 is composed of the first optical system of Example 3 and the second optical system of Example 6, the virtual reality device corresponding to Example 9 is composed of the first optical system of Example 3 and the second optical system of Example 7, the virtual reality device corresponding to Example 10 is composed of the first optical system of Example 4 and the second optical system of Example 5, the virtual reality device corresponding to Example 11 is composed of the first optical system of Example 4 and the second optical system of Example 6, and the virtual reality device corresponding to Example 12 is composed of the first optical system of Example 4 and the second optical system of Example 7.

[0201] In summary, the above examples 1 to 12 of the virtual reality device according to the present application respectively satisfy the conditional expressions shown in the following Table 16.

[0202] Conditional / Example 1 2 3 4 5 6 (fA / f1A) / (fB / f1B) -1.02 -0.79 -0.75 -0.50 -0.39 -0.37 (f3A / R6A)*(f8B / R16B) -2.03 -1.79 -1.87 -2.13 -1.88 -1.96 (fA / EPDA-fB / EPDB) 2.08 2.03 2.03 1.88 1.83 1.83 f23A / (CT2A+T23A+CT3A) 11.15 11.15 11.15 17.69 17.69 17.69 R2A / fZA -1.47 -1.47 -1.47 -0.46 -0.46 -0.46 f2A / R3A 2.26 2.26 2.26 1.55 1.55 1.55 fA*tan(FOVA / 2) 17.65 17.65 17.65 16.53 16.53 16.53 f2B / (R3B+R4B) 0.17 0.36 0.41 0.17 0.36 0.41 f3B / f7B 1.10 0.93 1.01 1.10 0.93 1.01 (f4B / CT4B)*(f5B / CT5B) 7.52 8.15 6.03 7.52 8.15 6.03 f6B / R11B 1.40 1.63 1.54 1.40 1.63 1.54 (∑CTA / fA)*(∑CTB / fB) 4.73 4.99 6.38 4.58 4.83 6.18 (TDB / EPDB) / (TDA / EPDA) 2.88 3.23 3.84 3.23 3.62 4.29 (R5B / R6B)*(R9B / R10B) -0.27 -0.25 -0.23 -0.27 -0.25 -0.23 Conditional / Example 7 8 9 10 11 12 (fA / f1A) / (fB / f1B) -1.06 -0.82 -0.78 -0.34 -0.27 -0.25 (f3A / R6A)*(f8B / R16B) -1.98 -1.75 -1.82 -2.13 -1.88 -1.96 (fA / EPDA-fB / EPDB) 2.08 2.03 2.03 1.92 1.87 1.87 f23A / (CT2A+T23A+CT3A) 12.40 12.40 12.40 8.25 8.25 8.25 R2A / fZA -1.34 -1.34 -1.34 -0.43 -0.43 -0.43 f2A / R3A 1.41 1.41 1.41 1.83 1.83 1.83 fA*tan(FOVA / 2) 17.66 17.66 17.66 16.76 16.76 16.76 f2B / (R3B+R4B) 0.17 0.36 0.41 0.17 0.36 0.41 f3B / f7B 1.10 0.93 1.01 1.10 0.93 1.01 (f4B / CT4B)*(f5B / CT5B) 7.52 8.15 6.03 7.52 8.15 6.03 f6B / R11B 1.40 1.63 1.54 1.40 1.63 1.54 (∑CTA / fA)*(∑CTB / fB) 5.17 5.45 6.97 4.40 4.64 5.94 (TDB / EPDB) / (TDA / EPDA) 2.69 3.02 3.58 3.31 3.71 4.40 (R5B / R6B)*(R9B / R10B) -0.27 -0.25 -0.23 -0.27 -0.25 -0.23

[0203] Table 16

[0204] 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 utility model 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 concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A virtual reality device, characterized in that comprising a first optical system and a second optical system, The first optical system includes, in order from a first side away from the display screen to a second side close to the display screen along the first optical axis: a first lens, a reflective polarizing element, a quarter wave plate, a second lens and a third lens; wherein the first lens has positive optical power, the second lens has positive optical power or negative optical power, and the third lens has positive optical power; The second optical system includes, in order from the object side to the image side along the second optical axis: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power and an eighth lens with positive optical power; wherein the real image formed by the second optical system is transmitted to the information processing unit in the form of an electrical signal, and the first optical system is used to project a virtual image on the display screen; and The effective focal length fA of the first optical system, the effective focal length f1A of the first lens, the effective focal length fB of the second optical system and the effective focal length f1B of the first lens satisfy: -1.2<(fA / f1A) / (fB / f1B)<-0.

2.

2. The virtual reality device according to claim 1, wherein: The effective focal length fA of the first optical system, the entrance pupil diameter EPDA of the first optical system, the effective focal length fB of the second optical system and the entrance pupil diameter EPDB of the second optical system satisfy: 1.8<(fA / EPDA-fB / EPDB)<2.

2.

3. The virtual reality device according to claim 1, wherein: The combined focal length f23A of the second lens and the third lens in the first optical system, the center thickness CT2A of the second lens on the first optical axis, the air gap T23A between the second side surface of the second lens and the first side surface of the third lens on the first optical axis in the first optical system, and the center thickness CT3A of the third lens on the first optical axis satisfy: 8.2 <f23A / (CT2A+T23A+CT3A)<17.7。 4. The virtual reality device according to claim 1, wherein: The radius of curvature R2A of the second side surface of the first lens satisfies the combined focal length fzA of the first lens, the reflective polarizing element and the quarter-wave plate in the first optical system: -1.5 <R2A / fzA<-0.4。 5. The virtual reality device according to claim 1, wherein: The effective focal length f2A of the second lens and the curvature radius R3A of the first side surface of the second lens satisfy: 1.4 <f2A / R3A<2.3。 6. The virtual reality device according to claim 1, wherein: The effective focal length fA of the first optical system and the maximum field of view FOVA of the first optical system satisfy: 16.5 mm <fA*tan(FOVA / 2)<17.7mm。 7. The virtual reality device according to claim 1, wherein: The effective focal length f2B of the second lens, the curvature radius R3B of the object side surface of the second lens, and the curvature radius R4B of the image side surface of the second lens satisfy: 0.1 <f2B / (R3B+R4B)<0.5。 8. The virtual reality device according to claim 1, wherein: The effective focal length f3B of the third lens and the effective focal length f7B of the seventh lens satisfy: 0.8 <f3B / f7B<1.2。 9. The virtual reality device according to claim 1, wherein: The effective focal length f4B of the fourth lens, the center thickness CT4B of the fourth lens on the second optical axis, the effective focal length f5B of the fifth lens and the center thickness CT5B of the fifth lens on the second optical axis satisfy: 6.0<(f4B / CT4B)*(f5B / CT5B)<8.

2.

10. The virtual reality device according to claim 1, wherein: The effective focal length f6B of the sixth lens and the curvature radius R11B of the object side surface of the sixth lens satisfy: 1.3 <f6B / R11B<1.7。 11. The virtual reality device according to claim 1, wherein: The sum of the center thicknesses ∑CTA of the first lens to the third lens on the first optical axis in the first optical system, the sum of the center thicknesses ∑CTB of the first lens to the eighth lens on the second optical axis in the second optical system, the effective focal length fA of the first optical system, and the effective focal length fB of the second optical system satisfy: 4.3<(∑CTA / fA)*(∑CTB / fB)<7.

0.

12. The virtual reality device according to claim 1, wherein: 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 in the second optical system, the entrance pupil diameter EPDB of the second optical system, the distance TDA from the first side surface of the first lens to the second side surface of the third lens in the first optical system on the first optical axis, and the entrance pupil diameter EPDA of the first optical system satisfy: 2.6<(TDB / EPDB) / (TDA / EPDA)<4.

5.

13. The virtual reality device according to claim 1, wherein: A curvature radius R5B of the object side surface of the third lens, a curvature radius R6B of the image side surface of the third lens, a curvature radius R9B of the object side surface of the fifth lens, and a curvature radius R10B of the image side surface of the fifth lens satisfy: -0.3<(R5B / R6B)*(R9B / R10B)<-0.

1.

14. A virtual reality device, characterized in that comprising a first optical system and a second optical system, The first optical system includes, in order from a first side away from the display screen to a second side close to the display screen along the first optical axis: a first lens, a reflective polarizing element, a quarter wave plate, a second lens and a third lens; wherein the first lens has positive optical power, the second lens has positive optical power or negative optical power, and the third lens has positive optical power; The second optical system includes, in order from the object side to the image side along the second optical axis: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power and an eighth lens with positive optical power; wherein the real image formed by the second optical system is transmitted to the information processing unit in the form of an electrical signal, and the first optical system is used to project a virtual image on the display screen; and The effective focal length f3A of the third lens, the curvature radius R6A of the second side surface of the third lens, the effective focal length f8B of the eighth lens and the curvature radius R16B of the image side surface of the eighth lens satisfy: -2.2<(f3A / R6A)*(f8B / R16B)<-1.

6.

15. The virtual reality device according to claim 14, wherein: The effective focal length fA of the first optical system, the entrance pupil diameter EPDA of the first optical system, the effective focal length fB of the second optical system and the entrance pupil diameter EPDB of the second optical system satisfy: 1.8<(fA / EPDA-fB / EPDB)<2.

2.

16. The virtual reality device according to claim 14, wherein: The combined focal length f23A of the second lens and the third lens in the first optical system, the center thickness CT2A of the second lens on the first optical axis, the air gap T23A between the second side surface of the second lens and the first side surface of the third lens on the first optical axis in the first optical system, and the center thickness CT3A of the third lens on the first optical axis satisfy: 8.2 <f23A / (CT2A+T23A+CT3A)<17.7。 17. The virtual reality device according to claim 14, wherein: The radius of curvature R2A of the second side surface of the first lens satisfies the combined focal length fzA of the first lens, the reflective polarizing element and the quarter-wave plate in the first optical system: -1.5 <R2A / fzA<-0.4。 18. The virtual reality device according to claim 14, wherein: The effective focal length f2A of the second lens and the curvature radius R3A of the first side surface of the second lens satisfy: 1.4 <f2A / R3A<2.3。 19. The virtual reality device according to claim 14, wherein: The effective focal length fA of the first optical system and the maximum field of view FOVA of the first optical system satisfy: 16.5 mm <fA*tan(FOVA / 2)<17.7mm。 20. The virtual reality device according to claim 14, wherein: The effective focal length f2B of the second lens, the curvature radius R3B of the object side surface of the second lens, and the curvature radius R4B of the image side surface of the second lens satisfy: 0.1 <f2B / (R3B+R4B)<0.5。 21. The virtual reality device according to claim 14, wherein: The effective focal length f3B of the third lens and the effective focal length f7B of the seventh lens satisfy: 0.8 <f3B / f7B<1.2。 22. The virtual reality device according to claim 14, wherein: The effective focal length f4B of the fourth lens, the center thickness CT4B of the fourth lens on the second optical axis, the effective focal length f5B of the fifth lens and the center thickness CT5B of the fifth lens on the second optical axis satisfy: 6.0<(f4B / CT4B)*(f5B / CT5B)<8.

2.

23. The virtual reality device according to claim 14, wherein: The effective focal length f6B of the sixth lens and the curvature radius R11B of the object side surface of the sixth lens satisfy: 1.3 <f6B / R11B<1.7。 24. The virtual reality device according to claim 14, wherein: The sum of the center thicknesses ∑CTA of the first lens to the third lens on the first optical axis in the first optical system, the sum of the center thicknesses ∑CTB of the first lens to the eighth lens on the second optical axis in the second optical system, the effective focal length fA of the first optical system, and the effective focal length fB of the second optical system satisfy: 4.3<(∑CTA / fA)*(∑CTB / fB)<7.

0.

25. The virtual reality device according to claim 14, wherein: 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 in the second optical system, the entrance pupil diameter EPDB of the second optical system, the distance TDA from the first side surface of the first lens to the second side surface of the third lens in the first optical system on the first optical axis, and the entrance pupil diameter EPDA of the first optical system satisfy: 2.6<(TDB / EPDB) / (TDA / EPDA)<4.

5.

26. The virtual reality device according to claim 14, wherein: A curvature radius R5B of the object side surface of the third lens, a curvature radius R6B of the image side surface of the third lens, a curvature radius R9B of the object side surface of the fifth lens, and a curvature radius R10B of the image side surface of the fifth lens satisfy: -0.3<(R5B / R6B)*(R9B / R10B)<-0.1.

Images