Virtual reality device

Abstract

The application provides a virtual reality device. The virtual reality device comprises a first optical system and a second optical system, the first optical system comprises a first element group, a second element group and a third element group from a first side to a second side, the first element group contains a first lens, the second element group contains a second lens, the third element group contains a third lens, a reflective polarizing element and a quarter wave plate which are attached to the third lens; the second optical system comprises a first lens with negative focal power, a second lens, a third lens with positive focal power, a fourth lens, a fifth lens and a sixth lens with negative focal power from a first side to a second side, and satisfies: 4 < TDA / TDB < 8; and satisfies: 1 < (VAmin / VBmin) / (VAmax / VBmax) < 4. The application solves the problems of large size, difficult chromatic aberration optimization and small field of view angle of the virtual reality device in the prior art.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to a virtual reality device. Background Technology

[0002] With the rapid development of virtual reality technology, various types of virtual reality devices have entered the market, such as head-mounted virtual reality devices. In order to enhance the immersiveness of virtual reality devices and improve the user experience, more and more optical systems with different functions are being applied to head-mounted devices, such as visual systems based on virtual reality imaging, perspective systems for interaction with reality, positioning systems for capturing motion, and recognition systems for capturing facial expressions of users, etc., forming complex virtual reality devices that significantly improve the user's virtual reality experience.

[0003] Existing technologies have proposed virtual reality devices that include a visual system and a perspective system. The visual system allows users to enter the virtual world, while the perspective system enables interaction between the virtual and real worlds. The perspective system primarily captures real-time images of the real world through a camera, then combines these images with virtual images, ultimately allowing users to "see" the real world within the virtual world. However, current virtual reality devices, due to the inclusion of multiple optical systems, are relatively large, making miniaturization and weight reduction difficult, thus impacting the user experience. Furthermore, optimizing overall color aberration is challenging, affecting overall image quality. Additionally, the narrow field of view of the perspective system severely impacts the user's tactile experience.

[0004] In other words, existing virtual reality devices suffer from problems such as large size, difficulty in optimizing color difference, and small field of view. Summary of the Invention

[0005] The main objective of this invention is to provide a virtual reality device to solve the problems of large size, difficulty in color difference optimization, and small field of view in existing virtual reality devices.

[0006] To achieve the above objective, according to one aspect of the present invention, there is provided a virtual reality device comprising a first optical system and a second optical system that cooperate with each other, wherein the first optical system comprises, from a first side to a second side, a first element group, a second element group and a third element group, the first element group comprises a first lens, the second element group comprises a second lens, and the third element group comprises a third lens, as well as a reflective polarizing element and a quarter-wave plate that are bonded to the third lens, a first side surface of the third lens is a flat surface, and at least a partial region of a second side surface of the third lens is provided with a reflective film; the second optical system comprises, from a first side to a second side, a first lens with negative refractive power, a second lens, a third lens with positive refractive power, a fourth lens, a fifth lens and a sixth lens with negative refractive power, wherein the sign of the refractive power of the second lens is opposite to that of the fourth lens, and the sign of the refractive power of the fourth lens is opposite to that of the fifth lens, the distance TDA on the optical axis from the first side surface of the first lens in the first optical system to the second side surface of the third lens and the distance TDB on the optical axis from the first side surface of the first lens in the second optical system to the second side surface of the sixth lens satisfy: 4<TDA / TDB<8; the minimum Abbe number VAmin of the three lenses in the first optical system, the maximum Abbe number VAmax of the three lenses in the first optical system, the minimum Abbe number VBmin of the six lenses in the second optical system and the maximum Abbe number VBmax of the six lenses in the second optical system satisfy: 1<(VAmin / VBmin) / (VAmax / VBmax)<4.

[0007] Further, the sum of the center thicknesses on the optical axis of the first lens to the third lens in the first optical system ∑CTA, the sum of the center thicknesses on the optical axis of the first lens to the sixth lens in the second optical system ∑CTB, the center thickness CTRP of the reflective polarizing element and the center thickness CTQWP of the quarter-wave plate satisfy: 5<(∑CTA+CTRP+CTQWP) / ∑CTB<15.

[0008] Further, the effective focal length fA of the first optical system, the effective focal length fB of the second optical system, the maximum half field of view HFOVA of the first optical system and the maximum half field of view HFOVB of the second optical system satisfy: 25mm<fA tan(HFOVA)-fB tan(HFOVB)<35mm.

[0009] Furthermore, the center thickness CT3A of the third lens of the first optical system on the optical axis, the center thickness CTRP of the reflective polarizing element, the center thickness CTQWP of the quarter-wave plate, the center thickness CT1A of the first lens of the first optical system on the optical axis, and the center thickness CT2A of the second lens of the first optical system satisfy the following: 1<(CT3A+CTRP+CTQWP) / (CT1A+CT2A)<3.

[0010] Furthermore, the effective focal length fA of the first optical system, the numerical aperture fnoA of the first optical system, and ImghA, half the diagonal length of the effective pixel area on the image plane of the first optical system, satisfy the following relationship: 5 <fA / ImghA fnoA<8.

[0011] Furthermore, the effective radius DT11A of the first side surface of the first lens of the first optical system, the effective radius DT21A of the first side surface of the second lens of the first optical system, and the effective radius DT31A of the first side surface of the third lens of the first optical system satisfy the following condition: 5 < (DT31A - DT21A) / (DT21A - DT11A) < 10.

[0012] Furthermore, the radius of curvature R2A of the second side surface of the first lens of the first optical system and the radius of curvature R3A of the first side surface of the second lens of the first optical system satisfy the following relationship: 0.8 <R2A / R3A<1.1。

[0013] Furthermore, the sum of the center thicknesses ∑CTA of the first to third lenses of the first optical system along the optical axis and the sum of the edge thicknesses ∑ETA of the first to third lenses of the first optical system satisfy the following condition: 1 < ∑CTA / ∑ETA < 3.

[0014] Furthermore, the radius of curvature R6A of the second side surface of the third lens of the first optical system and the radius of curvature R4A of the second side surface of the second lens of the first optical system satisfy the following condition: 2<(R6A+R4A) / (R6A-R4A)<7.

[0015] Furthermore, the radius of curvature R1B of the first side surface of the first lens of the second optical system, the radius of curvature R2B of the second side surface of the first lens of the second optical system, and the effective focal length f1B of the first lens of the second optical system satisfy the following relationship: -3 <f1B / (R1B+R2B)<-1。

[0016] Furthermore, the distance TDB on the optical axis between the first side surface of the first lens and the second side surface of the sixth lens in the second optical system, the effective focal length fB of the second optical system, and the numerical aperture fnoB of the second optical system satisfy the following relationship: 4 <TDB / fB fnoB<5.

[0017] Furthermore, the effective focal length f3B of the third lens of the second optical system and the effective focal length f6B of the sixth lens of the second optical system satisfy the following condition: 3<|(f3B-f6B) / (f3B+f6B)|<6.

[0018] Furthermore, the sum of the center thicknesses of the first to sixth lenses of the second optical system on the optical axis, ∑CTB, the maximum value of the center thicknesses of the first to sixth lenses of the second optical system, CTBmax, and the minimum value of the center thicknesses of the first to sixth lenses of the second optical system, CTBmin, satisfy the following condition: 2 < ∑CTB / (CTBmax + CTBmin) < 3.5.

[0019] Furthermore, the effective radius DT11B of the first side surface of the first lens of the second optical system, the effective radius DT32B of the second side surface of the third lens of the second optical system, and the effective radius DT62B of the second side surface of the sixth lens of the second optical system satisfy the following relationship: 1<(DT62B-DT32B) / (DT11B-DT32B)<2.

[0020] According to another aspect of the present invention, a virtual reality device is provided, comprising a first optical system and a second optical system cooperating with each other. The first optical system includes, from a first side to a second side, a first element group, a second element group, and a third element group. The first element group includes a first lens, the second element group includes a second lens, and the third element group includes a third lens, a reflective polarizing element, and a quarter-wave plate attached to the third lens. The first side of the third lens is planar, and at least a portion of the second side of the third lens is provided with a reflective film. The second optical system includes, from the first side to the second side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens with negative optical power. The optical power of the second lens is opposite to that of the fourth lens, and the optical power of the fourth lens is positive. The negative sign is opposite to the positive sign of the optical power of the fifth lens. The sum of the center thicknesses of the first to third lenses in the first optical system ∑CTA, the sum of the center thicknesses of the first to sixth lenses in the second optical system ∑CTB, the center thickness CTRP of the reflective polarizing element and the center thickness CTQWP of the quarter-wave plate satisfy the following: 5 < (∑CTA + CTRP + CTQWP) / ∑CTB < 15. The minimum Abbe number VAmin of the three lenses in the first optical system, the maximum Abbe number VAmax of the three lenses in the first optical system, the minimum Abbe number VBmin of the six lenses in the second optical system and the maximum Abbe number VBmax of the six lenses in the second optical system satisfy the following: 1 < (VAmin / VBmin) / (VAmax / VBmax) < 4.

[0021] Furthermore, the effective focal length fA of the first optical system, the effective focal length fB of the second optical system, and the maximum half-field angle HFOVA of the first optical system and the maximum half-field angle HFOVB of the second optical system satisfy the following condition: 25mm <fA tan(HFOVA)-fB tan(HFOVB) < 35 mm.

[0022] Further, the distance TDA on the optical axis from the first side surface of the first lens element of the first optical system to the second side surface of the third lens element and the distance TDB on the optical axis from the first side surface of the first lens of the second optical system to the second side surface of the sixth lens satisfy: 4<TDA / TDB<8; the center thickness CT3A of the third lens element of the first optical system on the optical axis, the center thickness CTRP of the reflective polarizing element, the center thickness CTQWP of the quarter-wave plate, the center thickness CT1A of the first lens element of the first optical system on the optical axis, and the center thickness CT2A of the second lens element of the first optical system on the optical axis satisfy: 1<(CT3A+CTRP+CTQWP) / (CT1A+CT2A)<3.

[0023] Further, the effective focal length fA of the first optical system, the f-number fnoA of the first optical system, and half of the diagonal length of the effective pixel area ImghA on the image plane of the first optical system satisfy: 5<fA / ImghA fnoA<8.

[0024] Further, the effective radius DT11A of the first side surface of the first lens element of the first optical system, the effective radius DT21A of the first side surface of the second lens element of the first optical system, and the effective radius DT31A of the first side surface of the third lens element of the first optical system satisfy: 5<(DT31A-DT21A) / (DT21A-DT11A)<10.

[0025] Further, the curvature radius R2A of the second side surface of the first lens element of the first optical system and the curvature radius R3A of the first side surface of the second lens element of the first optical system satisfy: 0.8<R2A / R3A<1.1.

[0026] Further, the sum of center thicknesses ∑CTA of the first to third lens elements of the first optical system on the optical axis and the sum of edge thicknesses ∑ETA of the first to third lens elements of the first optical system satisfy: 1<∑CTA / ∑ETA<3.

[0027] Further, the curvature radius R6A of the second side surface of the third lens element of the first optical system and the curvature radius R4A of the second side surface of the second lens element of the first optical system satisfy: 2<(R6A+R4A) / (R6A-R4A)<7.

[0028] Further, the curvature radius R1B of the first side surface of the first lens of the second optical system, the curvature radius R2B of the second side surface of the first lens of the second optical system, and the effective focal length f1B of the first lens of the second optical system satisfy: -3<f1B / (R1B+R2B)<-1.

[0029] Furthermore, the distance TDB on the optical axis between the first side surface of the first lens and the second side surface of the sixth lens in the second optical system, the effective focal length fB of the second optical system, and the numerical aperture fnoB of the second optical system satisfy the following relationship: 4 <TDB / fB fnoB<5.

[0030] Furthermore, the effective focal length f3B of the third lens of the second optical system and the effective focal length f6B of the sixth lens of the second optical system satisfy the following condition: 3<|(f3B-f6B) / (f3B+f6B)|<6.

[0031] Furthermore, the sum of the center thicknesses of the first to sixth lenses of the second optical system on the optical axis, ∑CTB, the maximum value of the center thicknesses of the first to sixth lenses of the second optical system, CTBmax, and the minimum value of the center thicknesses of the first to sixth lenses of the second optical system, CTBmin, satisfy the following condition: 2 < ∑CTB / (CTBmax + CTBmin) < 3.5.

[0032] Furthermore, the effective radius DT11B of the first side surface of the first lens of the second optical system, the effective radius DT32B of the second side surface of the third lens of the second optical system, and the effective radius DT62B of the second side surface of the sixth lens of the second optical system satisfy the following relationship: 1<(DT62B-DT32B) / (DT11B-DT32B)<2.

[0033] By applying the technical solution of the present invention, a virtual reality device includes a first optical system and a second optical system that cooperate with each other, wherein the first optical system includes, from a first side to a second side, a first element group, a second element group and a third element group; the first element group includes a first lens element, the second element group includes a second lens element, and the third element group includes a third lens element, a reflective polarizing element and a quarter-wave plate that are attached to the third lens element, a first side surface of the third lens element is a plane, and at least a partial region of a second side surface of the third lens element is provided with a reflective film; the second optical system includes, from a first side to a second side, a first lens having negative power, a second lens, a third lens having positive power, a fourth lens, a fifth lens, and a sixth lens having negative power, wherein the sign of the power of the second lens is opposite to that of the power of the fourth lens, and the sign of the power of the fourth lens is opposite to that of the power of the fifth lens; the distance TDA on the optical axis from the first side surface of the first lens of the first optical system to the second side surface of the third lens and the distance TDB on the optical axis from the first side surface of the first lens of the second optical system to the second side surface of the sixth lens satisfy: 4 < TDA / TDB < 8; the minimum Abbe number VAmin of the three lenses in the first optical system, the maximum Abbe number VAmax of the three lenses in the first optical system, the minimum Abbe number VBmin of the six lenses in the second optical system and the maximum Abbe number VBmax of the six lenses in the second optical system satisfy: 1 < (VAmin / VBmin) / (VAmax / VBmax) < 4.

[0034] The first optical system is a visual system, and the second optical system is a perspective system. The second optical system captures the external environment and transmits the resulting real image to the display screen in the form of an electrical signal. The first optical system projects a virtual image onto the display screen and the real image transmitted to the display screen to the human eye, thereby achieving a display effect that combines virtual and real images. The first optical system consists of three sets of lenses. A reflective polarizing element and a quarter-wave plate are attached to the third lens. At least a portion of the second side of the third lens is provided with a reflective film, which enables refraction and reflection of the light path, shortening the length of the light path and thus compressing the overall length of the first optical system. This reduces the overall volume and size of the virtual reality device, achieving miniaturization. At the same time, setting the first side of the third lens to be flat can effectively reduce the difficulty of attachment and improve the attachment efficiency. The second optical system consists of six lenses. By reasonably constraining the optical power of each lens, the ratio of the on-axis distance between the first and second optical systems, and the Abbe numbers of the lenses in both systems, the first and sixth lenses of the second optical system bear the main optical power. The second, third, fourth, and fifth lenses are used for aberration balancing and correction, achieving the effect of a short focal length and a large field of view in the second optical system. This also allows for a better allocation of the size and performance of the first and second optical systems, which is beneficial for the compact and integrated design of the system. Furthermore, it can control the overall chromatic aberration of the virtual reality device, effectively control system chromatic aberration, and reduce the risk of purple fringing. Attached Figure Description

[0035] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A diagram illustrating the relative positions of a first optical system and a second optical system of a virtual reality device according to an alternative embodiment of the present invention in a head-mounted device; Figure 2 It shows Figure 1 A schematic diagram of a head-mounted device from one angle; Figure 3 It shows Figure 1 A schematic diagram of the head-mounted device from another angle; Figure 4 A schematic diagram of the structure of the first optical system of Embodiment 1 is shown; Figures 5 to 7 They are shown respectively Figure 4 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the first optical system in the image; Figure 8 A schematic diagram of the structure of the first optical system of Embodiment 2 is shown; Figures 9 to 11 They are shown respectively Figure 8 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the first optical system in the image; Figure 12 A schematic diagram of the structure of the first optical system in Embodiment 3 is shown; Figures 13 to 15 They are shown respectively Figure 12 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the first optical system in the image; Figure 16 A schematic diagram of the structure of the second optical system in Embodiment 4 is shown; Figures 17 to 19 They are shown respectively Figure 16 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the second optical system in the image; Figure 20 A schematic diagram of the structure of the second optical system in Embodiment 4 is shown; Figures 21 to 23 They are shown respectively Figure 20 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the second optical system in the image; Figure 24 A schematic diagram of the structure of the second optical system in Embodiment 4 is shown; Figures 25 to 27 They are shown respectively Figure 24 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the second optical system in the image. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0038] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

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

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

[0041] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 first side is called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the first side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the second side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0042] It should be noted that in the first optical system, the left side is the first side and the right side is the second side. The first side of the first optical system is the imaging side, and the second side is the light source side. The image emitted by the light source is imaged on the image plane of the imaging side. In the second optical system, the left side is the first side and the right side is the second side. The first side of the second optical system is the object side, and the second side is the image side.

[0043] To address the problems of large size, difficulty in color difference optimization, and small field of view in existing virtual reality devices, this invention provides a virtual reality device.

[0044] like Figures 1 to 27 As shown in one optional embodiment of this application.

[0045] A virtual reality apparatus comprises a first optical system and a second optical system that cooperate with each other, wherein the first optical system comprises, from a first side to a second side, a first element group, a second element group and a third element group, the first element group comprises a first lens, the second element group comprises a second lens, the third element group comprises a third lens, and a reflective polarizing element and a quarter-wave plate attached to the third lens, a first side surface of the third lens is a plane, and at least a partial region of a second side surface of the third lens is provided with a reflective film; the second optical system comprises, from a first side to a second side, a first lens having negative optical power, a second lens, a third lens having positive optical power, a fourth lens, a fifth lens and a sixth lens having negative optical power, wherein the sign of the optical power of the second lens is opposite to that of the optical power of the fourth lens, and the sign of the optical power of the fourth lens is opposite to that of the optical power of the fifth lens, a distance TDA on the optical axis from the first side surface of the first lens of the first optical system to the second side surface of the third lens and a distance TDB on the optical axis from the first side surface of the first lens of the second optical system to the second side surface of the sixth lens satisfy: 4<TDA / TDB<8; the minimum Abbe number VAmin of the three lenses in the first optical system, the maximum Abbe number VAmax of the three lenses in the first optical system, the minimum Abbe number VBmin of the six lenses in the second optical system, and the maximum Abbe number VBmax of the six lenses in the second optical system satisfy: 1<(VAmin / VBmin) / (VAmax / VBmax)<4.

[0046] The first optical system is a visual system, and the second optical system is a perspective system. The second optical system captures the external environment and transmits the resulting real image to the display screen in the form of an electrical signal. The first optical system projects a virtual image onto the display screen and the real image transmitted to the display screen to the human eye, thereby achieving a display effect that combines virtual and real images. The first optical system consists of three sets of lenses. A reflective polarizing element and a quarter-wave plate are attached to the third lens. At least a portion of the second side of the third lens is provided with a reflective film, which enables refraction and reflection of the light path, shortening the length of the light path and thus compressing the overall length of the first optical system. This reduces the overall volume and size of the virtual reality device, achieving miniaturization. At the same time, setting the first side of the third lens to be flat can effectively reduce the difficulty of attachment and improve the attachment efficiency. The second optical system consists of six lenses. By reasonably constraining the optical power of each lens, the ratio of the on-axis distance between the first and second optical systems, and the Abbe numbers of the lenses in both systems, the first and sixth lenses of the second optical system bear the main optical power. The second, third, fourth, and fifth lenses are used for aberration balancing and correction, achieving the effect of a short focal length and a large field of view in the second optical system. This also allows for a better allocation of the size and performance of the first and second optical systems, which is beneficial for the compact and integrated design of the system. Furthermore, it can control the overall chromatic aberration of the virtual reality device, effectively control system chromatic aberration, and reduce the risk of purple fringing.

[0047] In this embodiment, the first optical system has an aperture stop, which is disposed on the first side of the first lens.

[0048] In this embodiment, the second optical system has an aperture stop, which is disposed between the second lens and the third lens.

[0049] In this embodiment, the sum of the center thicknesses ∑CTA of the first to third lenses of the first optical system along the optical axis, the sum of the center thicknesses ∑CTB of the first to sixth lenses of the second optical system along the optical axis, the center thickness CTRP of the reflective polarizing element, and the center thickness CTQWP of the quarter-wave plate satisfy the following condition: 5 < (∑CTA + CTRP + CTQWP) / ∑CTB < 15. Satisfying this condition allows control over the volume ratio of the two optical systems, which helps constrain the overall size of the two systems and ensures effective cooperation between them.

[0050] In this embodiment, the effective focal length fA of the first optical system, the effective focal length fB of the second optical system, and the maximum half field of view HFOVA of the first optical system and the maximum half field of view HFOVB of the second optical system satisfy the following: 25mm <fA tan(HFOVA)-fB tan(HFOVB) < 35 mm. By controlling this conditional expression, the image heights of the first optical system and the second optical system are matched, and the combined function of the first optical system and the second optical system is realized.

[0051] In this embodiment, the following relationship is satisfied among the central thickness CT3A of the third lens of the first optical system on the optical axis, the central thickness CTRP of the reflective polarizing element, the central thickness CTQWP of the quarter-wave plate, the central thickness CT1A of the first lens of the first optical system on the optical axis and the central thickness CT2A of the second lens of the first optical system on the optical axis: 1 < (CT3A+CTRP+CTQWP) / (CT1A+CT2A) < 3. Through this relational expression, the thicknesses of different optical elements of the first optical system are reasonably distributed, which is beneficial to improving the longitudinal spherical aberration of the system and controlling the distortion of the system.

[0052] In this embodiment, the following relationship is satisfied among the effective focal length fA of the first optical system, the f-number fnoA of the first optical system and half of the diagonal length ImghA of the effective pixel area on the image plane of the first optical system: 5 < fA / ImghA fnoA < 8. By controlling this conditional expression, the light passing through the first optical system is controlled, the relative illumination of the system is ensured, the luminous flux received by the imaging surface is guaranteed, and the quality of the first optical system is effectively improved.

[0053] In this embodiment, the following relationship is satisfied among the effective radius DT11A of the first side surface of the first lens of the first optical system, the effective radius DT21A of the first side surface of the second lens of the first optical system and the effective radius DT31A of the first side surface of the third lens of the first optical system: 5 < (DT31A-DT21A) / (DT21A-DT11A) < 10. By controlling this conditional expression, the propagation direction and height of light can be controlled, which is beneficial to improving the resolving power of the system and reducing the risk of stray light.

[0054] In this embodiment, the following relationship is satisfied between the curvature radius R2A of the second side surface of the first lens of the first optical system and the curvature radius R3A of the first side surface of the second lens of the first optical system: 0.8 < R2A / R3A < 1.1. By controlling this conditional expression, the propagation direction of light in the first lens and the second lens is optimized, and the CRA of the outer field of view is effectively controlled so that it is in a small range, and a small CRA is realized.

[0055] In this embodiment, the sum of the center thicknesses on the optical axis ∑CTA of the first to third lenses of the first optical system and the sum of the edge thicknesses ∑ETA of the first to third lenses of the first optical system satisfy: 1 < ∑CTA / ∑ETA < 3. Controlling this conditional expression can adjust the thickness-to-thickness ratio of the entire first optical system, ensure the rationality of the lens structure of the first optical system, help balance the image quality of each field of view, and reduce the risk of ghost images and stray light.

[0056] In this embodiment, the radius of curvature R6A of the second side surface of the third lens of the first optical system and the radius of curvature R4A of the second side surface of the second lens of the first optical system satisfy: 2 < (R6A+R4A) / (R6A-R4A) < 7. Controlling this conditional expression to adjust the propagation path of light rays in the system is beneficial to improving the image quality and relative illumination of the system, and can ensure the processability of manufacturing the second lens and the third lens.

[0057] In this embodiment, the radius of curvature R1B of the first side surface of the first lens of the second optical system, the radius of curvature R2B of the second side surface of the first lens of the second optical system, and the effective focal length f1B of the first lens of the second optical system satisfy: -3 < f1B / (R1B+R2B) < -1. By controlling this conditional expression, it is constrained that the first lens bears the main negative optical power of the system, so as to ensure the light refraction capability of the first lens.

[0058] In this embodiment, the distance on the optical axis from the first side surface of the first lens to the second side surface of the sixth lens TDB in the second optical system, the effective focal length fB of the second optical system, and the f-number fnoB of the second optical system satisfy: 4 < TDB / fB fnoB < 5. By controlling this conditional expression, the total length of the system is constrained on the premise of ensuring the f-number and effective focal length of the system, which is conducive to the compact design of the system.

[0059] In this embodiment, the effective focal length f3B of the third lens of the second optical system and the effective focal length f6B of the sixth lens of the second optical system satisfy: 3 < |(f3B-f6B) / (f3B+f6B)| < 6. By controlling this conditional expression, the optical power distribution of the negative lenses in the second optical system is adjusted, which is beneficial to improving the propagation path of light rays in the system.

[0060] In this embodiment, the sum of the center thicknesses ∑CTB of the first to sixth lenses of the second optical system along the optical axis, the maximum value CTBmax of the center thicknesses of the first to sixth lenses of the second optical system along the optical axis, and the minimum value CTBmin of the center thicknesses of the first to sixth lenses of the second optical system along the optical axis satisfy the following condition: 2 < ∑CTB / (CTBmax + CTBmin) < 3.5. By controlling this condition, a reasonable distribution of lens thickness can be achieved, which is beneficial for reducing the overall length of the system, shortening the system size, and facilitating lens molding and processing.

[0061] In this embodiment, the effective radius DT11B of the first side surface of the first lens of the second optical system, the effective radius DT32B of the second side surface of the third lens of the second optical system, and the effective radius DT62B of the second side surface of the sixth lens of the second optical system satisfy the following relationship: 1 < (DT62B - DT32B) / (DT11B - DT32B) < 2. By controlling the effective radius of the lenses in the second optical system, the height of the light rays is constrained, avoiding the risk of total internal reflection caused by excessively high light rays. Furthermore, the aperture sizes of the front and rear lenses are ensured, avoiding large step differences in the structure and improving assembly stability.

[0062] like Figures 1 to 27 As shown, in another alternative embodiment of this application.

[0063] The virtual reality device includes a first optical system and a second optical system that cooperate with each other. The first optical system, from a first side to a second side, includes a first element group, a second element group, and a third element group. The first element group includes a first lens, the second element group includes a second lens, and the third element group includes a third lens, a reflective polarizing element, and a quarter-wave plate attached to the third lens. The first side of the third lens is planar, and at least a portion of the second side of the third lens is provided with a reflective film. The second optical system, from a first side to a second side, includes a first lens with negative optical power, a second lens, a third lens with positive optical power, a fourth lens, a fifth lens, and a sixth lens with negative optical power. The sign of the optical power of the second lens is opposite to that of the fourth lens, and the sign of the optical power of the fourth lens is opposite to that of the fifth lens. The signs of the degrees are opposite. The sum of the center thicknesses of the first to third lenses in the first optical system ∑CTA, the sum of the center thicknesses of the first to sixth lenses in the second optical system ∑CTB, the center thickness CTRP of the reflective polarizing element and the center thickness CTQWP of the quarter-wave plate satisfy the following: 5 < (∑CTA + CTRP + CTQWP) / ∑CTB < 15; the minimum Abbe number VAmin of the three lenses in the first optical system, the maximum Abbe number VAmax of the three lenses in the first optical system, the minimum Abbe number VBmin of the six lenses in the second optical system and the maximum Abbe number VBmax of the six lenses in the second optical system satisfy the following: 1 < (VAmin / VBmin) / (VAmax / VBmax) < 4.

[0064] The first optical system is a visual system, and the second optical system is a perspective system. The second optical system captures the external environment and transmits the resulting real image to the display screen in the form of an electrical signal. The first optical system projects a virtual image onto the display screen and the real image transmitted to the display screen to the human eye, thereby achieving a display effect that combines virtual and real images. The first optical system consists of three sets of lenses. A reflective polarizing element and a quarter-wave plate are attached to the third lens. At least a portion of the second side of the third lens is provided with a reflective film, which enables refraction and reflection of the light path, shortening the length of the light path and thus compressing the overall length of the first optical system. This reduces the overall volume and size of the virtual reality device, achieving miniaturization. At the same time, setting the first side of the third lens to be flat can effectively reduce the difficulty of attachment and improve the attachment efficiency. The second optical system consists of six lenses. By reasonably constraining the optical power of each lens, the center thickness of the lenses and optical elements in the first optical system, the center thickness of the lenses in the second optical system, and the Abbe number of the lenses in the first and second optical systems, the first and sixth lenses of the second optical system bear the main optical power. The second, third, fourth, and fifth lenses are used for aberration balancing and correction, achieving the effect of a short focal length and a large field of view in the second optical system. It can also control the volume ratio of the two optical systems, which is beneficial to constrain the overall size of the two systems and ensure the effective use of the two optical systems. Furthermore, it can control the overall dispersion of the virtual reality device, effectively control system chromatic aberration, and reduce the risk of purple fringing.

[0065] In this embodiment, the first optical system has an aperture stop, which is disposed on the first side of the first lens.

[0066] In this embodiment, the second optical system has an aperture stop, which is disposed between the second lens and the third lens.

[0067] In this embodiment, the effective focal length fA of the first optical system, the effective focal length fB of the second optical system, and the maximum half field of view HFOVA of the first optical system and the maximum half field of view HFOVB of the second optical system satisfy the following: 25mm <fA tan(HFOVA)-fB tan(HFOVB) < 35mm. By controlling this conditional expression, the image height of the first optical system and the second optical system are matched, realizing the combined function of the first optical system and the second optical system.

[0068] In this embodiment, the following relationship is satisfied between TDA, which is the distance on the optical axis from the first side surface of the first lens element of the first optical system to the second side surface of the third lens element, and TDB, which is the distance on the optical axis from the first side surface of the first lens of the second optical system to the second side surface of the sixth lens: 4<TDA / TDB<8; and the following relationship is satisfied among CT3A, which is the central thickness of the third lens element of the first optical system on the optical axis, CTRP, which is the central thickness of the reflective polarizing element, CTQWP, which is the central thickness of the quarter-wave plate, CT1A, which is the central thickness of the first lens element of the first optical system on the optical axis, and CT2A, which is the central thickness of the second lens element of the first optical system on the optical axis: 1<(CT3A+CTRP+CTQWP) / (CT1A+CT2A)<3. Through this relational expression, the thicknesses of different optical elements of the first optical system are reasonably allocated, which is beneficial for improving the longitudinal spherical aberration of the system and controlling the distortion amount of the system.

[0069] In this embodiment, the following relationship is satisfied among fA, which is the effective focal length of the first optical system, fnoA, which is the f-number of the first optical system, and ImghA, which is half the diagonal length of the effective pixel area on the image plane of the first optical system: 5<fA / ImghA fnoA<8. Controlling this conditional expression regulates the light passing through the first optical system, ensures the relative illumination of the system, guarantees the luminous flux received by the imaging surface, and effectively improves the quality of the first optical system.

[0070] In this embodiment, the following relationship is satisfied among DT11A, which is the effective radius of the first side surface of the first lens element of the first optical system, DT21A, which is the effective radius of the first side surface of the second lens element of the first optical system, and DT31A, which is the effective radius of the first side surface of the third lens element of the first optical system: 5<(DT31A-DT21A) / (DT21A-DT11A)<10. By controlling this conditional expression, the propagation direction and height of light rays can be controlled, which is beneficial for improving the resolving power of the system and reducing the risk of stray light.

[0071] In this embodiment, the following relationship is satisfied between R2A, which is the radius of curvature of the second side surface of the first lens element of the first optical system, and R3A, which is the radius of curvature of the first side surface of the second lens element of the first optical system: 0.8<R2A / R3A<1.1. Controlling this conditional expression optimizes the propagation direction of light rays in the first lens element and the second lens element, effectively controls the chief ray angle (CRA) of the outer field of view to keep it within a small range, and achieves a small CRA.

[0072] In this embodiment, the sum of the central thicknesses on the optical axis of the first lens element to the third lens element of the first optical system ∑CTA and the sum of the edge thicknesses of the first lens element to the third lens element of the first optical system ∑ETA satisfy: 1<∑CTA / ∑ETA<3. Controlling this conditional expression can control the thickness-to-thickness ratio of the entire first optical system, ensure the rationality of the lens structure of the first optical system, help balance the image quality of each field of view, and reduce the risk of ghost images and stray light.

[0073] In this embodiment, the radius of curvature R6A of the second side surface of the third lens element of the first optical system and the radius of curvature R4A of the second side surface of the second lens element of the first optical system satisfy: 2<(R6A+R4A) / (R6A-R4A)<7. Controlling this conditional expression to control the propagation direction of light rays in the system is beneficial to improving the image quality and relative illumination of the system, and can ensure the processability of the second lens element and the third lens element.

[0074] In this embodiment, the radius of curvature R1B of the first side surface of the first lens of the second optical system, the radius of curvature R2B of the second side surface of the first lens of the second optical system, and the effective focal length f1B of the first lens of the second optical system satisfy: -3<f1B / (R1B+R2B)<-1. By controlling this conditional expression, the first lens is constrained to bear the main negative optical power of the system, ensuring the light refraction capability of the first lens.

[0075] In this embodiment, the distance on the optical axis TDB from the first side surface of the first lens to the second side surface of the sixth lens of the second optical system, the effective focal length fB of the second optical system, and the numerical aperture fnoB of the second optical system satisfy: 4<TDB / fB fnoB<5. By controlling this conditional expression, under the premise of ensuring the f-number and effective focal length of the system, the total length of the system is constrained, which is beneficial to the compact design of the system.

[0076] In this embodiment, the effective focal length f3B of the third lens of the second optical system and the effective focal length f6B of the sixth lens of the second optical system satisfy: 3<|(f3B-f6B) / (f3B+f6B)|<6. By controlling this conditional expression, the optical power of the negative lens in the second optical system is distributed, which is beneficial to improving the propagation direction of light rays in the system.

[0077] In this embodiment, the sum of the center thicknesses ∑CTB of the first to sixth lenses of the second optical system along the optical axis, the maximum value CTBmax of the center thicknesses of the first to sixth lenses of the second optical system along the optical axis, and the minimum value CTBmin of the center thicknesses of the first to sixth lenses of the second optical system along the optical axis satisfy the following condition: 2 < ∑CTB / (CTBmax + CTBmin) < 3.5. By controlling this condition, a reasonable distribution of lens thickness can be achieved, which is beneficial for reducing the overall length of the system, shortening the system size, and facilitating lens molding and processing.

[0078] In this embodiment, the effective radius DT11B of the first side surface of the first lens of the second optical system, the effective radius DT32B of the second side surface of the third lens of the second optical system, and the effective radius DT62B of the second side surface of the sixth lens of the second optical system satisfy the following relationship: 1 < (DT62B - DT32B) / (DT11B - DT32B) < 2. By controlling the effective radius of the lenses in the second optical system, the height of the light rays is constrained, avoiding the risk of total internal reflection caused by excessively high light rays. Furthermore, the aperture sizes of the front and rear lenses are ensured, avoiding large step differences in the structure and improving assembly stability.

[0079] Optionally, the first and second optical systems of the aforementioned virtual reality device may further include filters for correcting color deviations and / or protective glass for protecting the photosensitive element located on the imaging surface. By reasonably configuring the first and second optical systems, the virtual reality device of this application can be applied to head-mounted or portable VR devices.

[0080] In this application, at least one of the surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0081] Given that an aspherical surface is a structure obtained by rotating a curved surface in the meridional plane around the optical axis, this structure has rotational symmetry. In an ideal optical system, it can effectively correct aberrations in the meridional and sagittal planes. At the same time, its unique lens model can provide ample space for subsequent adjustments, allowing for more flexible structural and assembly processes without significantly reducing image quality.

[0082] However, those skilled in the art will understand that the number of lenses constituting the virtual reality device can be changed to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although the first optical system is described in the embodiments with three lenses as an example and the second optical system with six lenses as an example, the virtual reality device is not limited to including the above-mentioned number of lenses. If necessary, the virtual reality device may also include other numbers of lenses.

[0083] The following description, with reference to the accompanying drawings, further illustrates examples of the specific surface features and parameters of the first and second optical systems applicable to the virtual reality device described above.

[0084] It should be noted that any one of the embodiments 1 to 6 described below is applicable to all implementations of this application. Embodiments 1 to 3 describe a first optical system for a virtual reality device, and embodiments 4 to 6 describe a second optical system for a virtual reality device. Any one of the first optical systems in embodiments 1 to 3 can be used in conjunction with any one of the second optical systems in embodiments 4 to 6.

[0085] like Figure 1 The diagram shows the relative positions of the first optical system 10 and the second optical system 20 of the virtual reality device of this application in a head-mounted device. Of course, the virtual reality device of this application is not limited to the two systems of the first optical system 10 and the second optical system 20; for example, in… Figure 1 There is another optical system in the lower left corner. That is to say, the virtual reality device of this application can have three, four, or more systems. For example... Figure 2 As shown, Figure 1 A schematic diagram of a head-mounted device from one angle. (See diagram below.) Figure 3 As shown, Figure 1 Another schematic diagram of the head-mounted device.

[0086] Figures 4 to 15 Three embodiments of the first optical system 10 are described. Figures 16 to 27 Three embodiments of the second optical system 20 are described.

[0087] Example 1 like Figures 4 to 7 As shown, a first optical system 10 of a virtual reality device according to Embodiment 1 of this application is described. Figure 4 The optical path diagram of the first optical system 10 in Embodiment 1 is shown.

[0088] like Figure 4As shown, the first optical system 10 of the virtual reality device includes, from the first side to the second side, an aperture stop STO, a first lens E1, a second lens E2, a reflective polarizing element RP, a quarter-wave plate QWP, a third lens E3, and a light-emitting surface S9 of the light source. The reflective polarizing element RP and the quarter-wave plate QWP are attached to the first side surface S7 of the third lens.

[0089] The first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is convex. The first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is convex. The first side surface S7 of the third lens is flat, and the second side surface S8 of the third lens is convex.

[0090] In this embodiment, the numerical aperture fnoA of the first optical system 10 is 4.48, half the diagonal length of the effective pixel area ImgHA on the image plane of the first optical system 10 is 17.86 mm, the maximum half field of view HFOVA of the first optical system 10 is 53.00°, the distance TDA on the optical axis between the first side surface S1 of the first lens and the second side surface S8 of the third lens of the first optical system 10 is 19.33 mm, the effective focal length FA of the first optical system 10 is 22.40 mm, and the first lens of the first optical system 10... The sum of the edge thicknesses of the first lens E1 to the third lens E3, ∑ETA, is 9.88 mm. The sum of the center thicknesses of the first lens E1 to the third lens E3 on the optical axis, ∑CTA, is 18.63 mm. The effective radius DT11A of the first side surface of the first lens of the first optical system 10 is 16.53 mm. The effective radius DT21A of the first side surface of the second lens of the first optical system 10 is 16.97 mm. The effective radius DT31A of the first side surface of the third lens of the first optical system 10 is 21.18 mm.

[0091] Combination Figure 4 In the first optical system 10 of Embodiment 1, the light emitted from the light-emitting surface S9 of the light source passes sequentially through the third lens E3 and the quarter-wave plate QWP before being incident on the second side of the reflective polarizing element RP, where a first reflection occurs. The light reflected in the first reflection passes through the quarter-wave plate QWP and is incident on the third lens, where a second reflection occurs on a portion of the reflective film on the second side of the third lens. The light reflected in the second reflection passes sequentially through the first side of the third lens S7, the quarter-wave plate QWP, the reflective polarizing element RP, the second lens E2, and the first lens E1 before being imaged at the aperture stop STO.

[0092] Table 1 shows the basic structural parameters of the first optical system 10 in Embodiment 1, where the units for radius of curvature and thickness are millimeters (mm). The surface number order in the table below is the reverse of the actual optical path. The light emitted by the light-emitting surface S9 of the light source is imaged at the aperture stop STO. In Table 1, for ease of understanding, S5 can represent the first side surface of the reflective polarizing element RP, S6 can represent the shared surface of the reflective polarizing element RP and the quarter-wave plate QWP, and S7 can represent the shared surface of the quarter-wave plate QWP and the first side surface of the third lens.

[0093]

[0094] Table 1 In Embodiment 1, the two side surfaces of the first lens, the second lens, and the second side surface S8 of the third lens are all aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula: Formula (1); Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, and A10 that can be used for each aspherical mirror S1-S8 in Example 1.

[0095]

[0096] Table 2 Figure 5 The on-axis chromatic aberration curve of the first optical system 10 of the virtual reality device of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the first optical system 10. Figure 6 The astigmatism curve of the first optical system 10 of the virtual reality device of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 7 The distortion curve of the first optical system 10 of the virtual reality device of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0097] according to Figures 5 to 7 As can be seen, the first optical system 10 given in Example 1 can achieve good imaging quality.

[0098] Example 2 like Figures 8 to 11 As shown, the first optical system 10 of the virtual reality device according to Embodiment 2 of this application is described. Figure 8 The optical path diagram of the first optical system 10 in Embodiment 2 is shown.

[0099] like Figure 8 As shown, the first optical system 10 of the virtual reality device includes, from the first side to the second side, an aperture stop STO, a first lens E1, a second lens E2, a reflective polarizing element RP, a quarter-wave plate QWP, a third lens E3, and a light-emitting surface S9 of the light source. The reflective polarizing element RP and the quarter-wave plate QWP are attached to the first side surface S7 of the third lens.

[0100] The first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is convex. The first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is convex. The first side surface S7 of the third lens is flat, and the second side surface S8 of the third lens is convex.

[0101] In this embodiment, the numerical aperture fnoA of the first optical system 10 is 5.94, half the diagonal length of the effective pixel area ImgHA on the image plane of the first optical system 10 is 23.50 mm, the maximum half field of view HFOVA of the first optical system 10 is 52.39°, the distance TDA on the optical axis between the first side surface S1 of the first lens and the second side surface S8 of the third lens of the first optical system 10 is 26.33 mm, the effective focal length FA of the first optical system 10 is 29.72 mm, the sum of the edge thicknesses ∑ETA of the first lens E1 to the third lens E3 of the first optical system 10 is 13.61 mm, and the distance TDA between the first lens E1 to the third lens E3 of the first optical system 10 is 23.50 mm. The sum of the center thicknesses of the three lenses E3 along the optical axis, ∑CTA, is 25.74 mm. The effective radius DT11A of the first side surface of the first lens of the first optical system 10 is 21.10 mm. The effective radius DT21A of the first side surface of the second lens of the first optical system 10 is 22.07 mm. The effective radius DT31A of the first side surface of the third lens of the first optical system 10 is 27.60 mm. The effective focal length f1A of the first lens of the first optical system 10 is 171.02 mm. The effective focal length f2A of the second lens of the first optical system 10 is 175.81 mm. The effective focal length f3A of the third lens of the first optical system 10 is 39.37 mm.

[0102] Combination Figure 8 In Embodiment 2, the light emitted from the light-emitting surface S9 of the first optical system 10 passes sequentially through the third lens E3 and the quarter-wave plate QWP before being incident on the second side of the reflective polarizing element RP, resulting in a first reflection. The light reflected in the first reflection passes through the quarter-wave plate QWP and is incident on the third lens, where a second reflection occurs on a portion of the reflective film on the second side of the third lens. The light reflected in the second reflection passes sequentially through the first side S7 of the third lens, the quarter-wave plate QWP, the reflective polarizing element RP, the second lens E2, and the first lens E1 before being imaged at the aperture stop STO.

[0103] Table 3 shows the basic structural parameters of the first optical system 10 in Embodiment 2, where the units for radius of curvature and thickness are millimeters (mm). The surface number order in the table below is the reverse of the actual optical path. The light emitted by the light-emitting surface S9 of the light source is imaged at the aperture stop STO. In Table 3, for ease of understanding, S5 can represent the first side surface of the reflective polarizing element RP, S6 can represent the shared surface of the reflective polarizing element RP and the quarter-wave plate QWP, and S7 can represent the shared surface of the quarter-wave plate QWP and the first side surface of the third lens.

[0104]

[0105] Table 3 Table 4 shows the higher-order coefficients that can be used for each aspherical mirror in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0106]

[0107] Table 4 Figure 9 The on-axis chromatic aberration curve of the first optical system 10 of the virtual reality device of Embodiment 2 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the first optical system 10. Figure 10 The astigmatism curve of the first optical system 10 of the virtual reality device of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 11 The distortion curve of the first optical system 10 of the virtual reality device of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0108] according to Figures 9 to 11 It can be seen that the first optical system 10 given in Embodiment 2 can achieve good imaging quality.

[0109] Example 3 like Figures 12 to 15 As shown, the first optical system 10 of the virtual reality device according to Embodiment 3 of this application is described. Figure 12 The optical path diagram of the first optical system 10 in Embodiment 3 is shown.

[0110] like Figure 12 As shown, the first optical system 10 of the virtual reality device includes, from the first side to the second side, an aperture stop STO, a first lens E1, a second lens E2, a reflective polarizing element RP, a quarter-wave plate QWP, a third lens E3, and a light-emitting surface S9 of the light source. The reflective polarizing element RP and the quarter-wave plate QWP are attached to the first side surface S7 of the third lens.

[0111] The first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is convex. The first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is convex. The first side surface S7 of the third lens is flat, and the second side surface S8 of the third lens is convex.

[0112] In this embodiment, the numerical aperture fnoA of the first optical system 10 is 5.80, half the diagonal length of the effective pixel area ImgHA on the image plane of the first optical system 10 is 22.57 mm, the maximum half field of view HFOVA of the first optical system 10 is 52.82°, the distance TDA on the optical axis between the first side surface S1 of the first lens and the second side surface S8 of the third lens of the first optical system 10 is 29.72 mm, the effective focal length FA of the first optical system 10 is 28.98 mm, the sum of the edge thicknesses ∑ETA of the first lens E1 to the third lens E3 of the first optical system 10 is 12.48 mm, and the distance between the first lens E1 and the third lens E3 of the first optical system 10 is 29.72 mm. The sum of the center thicknesses of the three lenses E3 along the optical axis, ∑CTA, is 29.12 mm. The effective radius DT11A of the first side surface of the first lens of the first optical system 10 is 22.44 mm. The effective radius DT21A of the first side surface of the second lens of the first optical system 10 is 23.56 mm. The effective radius DT31A of the first side surface of the third lens of the first optical system 10 is 29.18 mm. The effective focal length f1A of the first lens of the first optical system 10 is 51.94 mm. The effective focal length f2A of the second lens of the first optical system 10 is -160.42 mm. The effective focal length f3A of the third lens of the first optical system 10 is 39.60 mm.

[0113] Combination Figure 12 In Embodiment 3, the light emitted from the light-emitting surface S9 of the first optical system 10 passes sequentially through the third lens E3 and the quarter-wave plate QWP before being incident on the second side of the reflective polarizing element RP, resulting in a first reflection. The first reflected light passes through the quarter-wave plate QWP and is incident on the third lens, where a second reflection occurs on a portion of the reflective film on the second side of the third lens. The second reflected light passes sequentially through the first side S7 of the third lens, the quarter-wave plate QWP, the reflective polarizing element RP, the second lens E2, and the first lens E1 before being imaged at the aperture stop STO.

[0114] Table 5 shows the basic structural parameters of the first optical system 10 in Embodiment 3, where the units for radius of curvature and thickness are millimeters (mm). The surface number order in the table below is the reverse of the actual optical path. The light emitted by the light-emitting surface S9 of the light source is imaged at the aperture stop STO. In Table 5, for ease of understanding, S5 can represent the first side surface of the reflective polarizing element RP, S6 can represent the shared surface of the reflective polarizing element RP and the quarter-wave plate QWP, and S7 can represent the shared surface of the quarter-wave plate QWP and the first side surface of the third lens.

[0115]

[0116] Table 5 Table 6 shows the higher-order coefficients that can be used for each aspherical mirror in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0117]

[0118] Table 6 Figure 13 The on-axis chromatic aberration curve of the first optical system 10 of the virtual reality device of Embodiment 3 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the first optical system 10. Figure 14 The astigmatism curve of the first optical system 10 of the virtual reality device of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 15 The distortion curve of the first optical system 10 of the virtual reality device of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0119] according to Figures 13 to 15 It can be seen that the first optical system 10 given in Embodiment 3 can achieve good imaging quality.

[0120] Example 4 like Figures 16 to 19 As shown, the second optical system 20 of the virtual reality device according to Embodiment 4 of this application is described. Figure 16 A schematic diagram of the structure of the second optical system 20 in Embodiment 4 is shown.

[0121] like Figure 16 As shown, the second optical system 20 of the virtual reality device includes, from the first side to the second side, a first lens E1, a second lens E2, an aperture stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective glass E7, and an imaging surface S15.

[0122] The first lens E1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens E2 has positive optical power, its first side surface S3 is convex, and its second side surface S4 is convex. The third lens E3 has positive optical power, its first side surface S5 is convex, and its second side surface S6 is convex. The fourth lens E4 has negative optical power, its first side surface S7 is concave, and its second side surface S8 is concave. The fifth lens E5 has positive optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens E6 has negative optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The protective glass E7 has a first side surface S13 and a second side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged on the imaging surface S15.

[0123] In this embodiment, the numerical aperture fnoB of the second optical system 20 is 2.30, the maximum half field of view HFOVB of the second optical system 20 is 60.02°, the distance TDB on the optical axis from the first side surface of the first lens to the second side surface of the sixth lens of the second optical system 20 is 3.78 mm, the effective focal length fB of the second optical system 20 is 2.13 mm, the effective focal length f1B of the first lens of the second optical system 20 is -4.78 mm, the effective focal length f2B of the second lens of the second optical system 20 is 3.95 mm, the effective focal length f3B of the third lens of the second optical system 20 is 2.24 mm, the effective focal length f4B of the fourth lens of the second optical system 20 is -2.84 mm, the effective focal length f5B of the fifth lens of the second optical system 20 is 1.96 mm, the effective focal length f6B of the sixth lens of the second optical system 20 is -3.31 mm, and the sum of the center thicknesses ∑CTB of the first lens to the sixth lens of the second optical system 20 on the optical axis is 3.00 mm.

[0124] Table 7 shows the basic structural parameters of the second optical system 20 in Embodiment 4, where the units for radius of curvature, thickness, and effective radius are all millimeters (mm).

[0125]

[0126] Table 7 Table 8 shows the higher-order coefficients that can be used for each aspherical mirror in Example 4, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0127]

[0128] Table 8 Figure 17 The on-axis chromatic aberration curve of the second optical system 20 of the virtual reality device of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system 20. Figure 18 The astigmatism curve of the second optical system 20 of the virtual reality device of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 19 The distortion curve of the second optical system 20 of the virtual reality device of Embodiment 4 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0129] according to Figures 17 to 19 It can be seen that the second optical system 20 given in Embodiment 4 can achieve good imaging quality.

[0130] Example 5 like Figures 20 to 23 As shown, the second optical system 20 of the virtual reality device according to Embodiment 5 of this application is described. Figure 20 A schematic diagram of the structure of the second optical system 20 in Embodiment 5 is shown.

[0131] like Figure 20 As shown, the second optical system 20 of the virtual reality device includes, from the first side to the second side, a first lens E1, a second lens E2, an aperture stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective glass E7, and an imaging surface S15.

[0132] The first lens E1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens E2 has negative optical power, its first side surface S3 is concave, and its second side surface S4 is convex. The third lens E3 has positive optical power, its first side surface S5 is convex, and its second side surface S6 is concave. The fourth lens E4 has positive optical power, its first side surface S7 is convex, and its second side surface S8 is convex. The fifth lens E5 has negative optical power, its first side surface S9 is concave, and its second side surface S10 is convex. The sixth lens E6 has negative optical power, its first side surface S11 is convex, and its second side surface S12 is concave. The protective glass E7 has a first side surface S13 and a second side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged on the imaging surface S15.

[0133] In this embodiment, the numerical aperture fnoB of the second optical system 20 is 2.30, the maximum half field of view HFOVB of the second optical system 20 is 60.05°, the distance TDB on the optical axis from the first side surface of the first lens to the second side surface of the sixth lens of the second optical system 20 is 4.19 mm, the effective focal length fB of the second optical system 20 is 2.13 mm, the effective focal length f1B of the first lens of the second optical system 20 is -5.60 mm, the effective focal length f2B of the second lens of the second optical system 20 is -92.11 mm, the effective focal length f3B of the third lens of the second optical system 20 is 6.88 mm, the effective focal length f4B of the fourth lens of the second optical system 20 is 1.61 mm, the effective focal length f5B of the fifth lens of the second optical system 20 is -4.42 mm, the effective focal length f6B of the sixth lens of the second optical system 20 is -3.49 mm, and the sum of the center thicknesses ∑CTB of the first lens to the sixth lens of the second optical system 20 on the optical axis is 2.98 mm.

[0134] Table 9 shows the basic structural parameters of the second optical system 20 in Embodiment 5, where the units for radius of curvature, thickness, and effective radius are all millimeters (mm).

[0135]

[0136] Table 9 Table 10 shows the higher-order coefficients that can be used for each aspherical mirror in Example 5, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0137]

[0138] Table 10 Figure 21 The on-axis chromatic aberration curve of the second optical system 20 of the virtual reality device of Embodiment 5 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system 20. Figure 22 The astigmatism curve of the second optical system 20 of the virtual reality device of Embodiment 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 23 The distortion curve of the second optical system 20 of the virtual reality device of Embodiment 5 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0139] according to Figures 21 to 23 It can be seen that the second optical system 20 given in Embodiment 5 can achieve good imaging quality.

[0140] Example 6 like Figures 24 to 27 As shown, a second optical system 20 of a virtual reality device according to Embodiment Six of this application is described. Figure 24 A schematic diagram of the structure of the second optical system 20 in Embodiment 6 is shown.

[0141] like Figure 24 As shown, the second optical system 20 of the virtual reality device includes, from the first side to the second side, a first lens E1, a second lens E2, an aperture stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective glass E7, and an imaging surface S15.

[0142] The first lens E1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave. The second lens E2 has positive optical power, its first side surface S3 is concave, and its second side surface S4 is convex. The third lens E3 has positive optical power, its first side surface S5 is convex, and its second side surface S6 is convex. The fourth lens E4 has negative optical power, its first side surface S7 is concave, and its second side surface S8 is concave. The fifth lens E5 has positive optical power, its first side surface S9 is convex, and its second side surface S10 is convex. The sixth lens E6 has negative optical power, its first side surface S11 is concave, and its second side surface S12 is convex. The protective glass E7 has a first side surface S13 and a second side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged on the imaging surface S15.

[0143] In this embodiment, the numerical aperture fnoB of the second optical system 20 is 2.30, the maximum half field of view HFOVB of the second optical system 20 is 60.04°, the distance TDB on the optical axis from the first side surface of the first lens to the second side surface of the sixth lens of the second optical system 20 is 4.25 mm, the effective focal length fB of the second optical system 20 is 2.13 mm, the effective focal length f1B of the first lens of the second optical system 20 is -4.21 mm, the effective focal length f2B of the second lens of the second optical system 20 is 10.03 mm, the effective focal length f3B of the third lens of the second optical system 20 is 1.76 mm, the effective focal length f4B of the fourth lens of the second optical system 20 is -3.12 mm, the effective focal length f5B of the fifth lens of the second optical system 20 is 2.67 mm, the effective focal length f6B of the sixth lens of the second optical system 20 is -2.92 mm, and the sum of the center thicknesses ∑CTB of the first lens to the sixth lens of the second optical system 20 on the optical axis is 2.60 mm.

[0144] Table 11 shows the basic structural parameters of the second optical system 20 in Embodiment 6, where the units for radius of curvature, thickness, and effective radius are all millimeters (mm).

[0145]

[0146] Table 11 Table 12 shows the higher-order coefficients that can be used for each aspherical mirror in Example 6, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0147]

[0148] Table 12 Figure 25 The on-axis chromatic aberration curve of the second optical system 20 of the virtual reality device of Embodiment Six is ​​shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system 20. Figure 26 The astigmatism curve of the second optical system 20 of the virtual reality device of Embodiment Six is ​​shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 27 The distortion curve of the second optical system 20 of the virtual reality device of Embodiment 6 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0149] according to Figures 25 to 27 As can be seen, the second optical system 20 given in Embodiment Six can achieve good imaging quality.

[0150] In summary, the virtual reality device includes a first optical system 10 and a second optical system 20. Embodiments 1 to 3 are three embodiments of the first optical system 10, and Embodiments 4 to 6 are three embodiments of the second optical system 20. The first optical system 10 of the virtual reality device can be any one of Embodiments 1 to 3, and the second optical system 20 of the virtual reality device can be any one of Embodiments 4 to 6. Therefore, the first optical system 10 and the second optical system 20 of the virtual reality device have a total of 3... There are 3 = 9 possible combinations, and the conditional values ​​for these 9 combinations are shown in Table 13 below. For example, in the table, combination 1 represents the combination of Example 1 and Example 4, combination 2 represents the combination of Example 1 and Example 5, combination 3 represents the combination of Example 1 and Example 6, combination 4 represents the combination of Example 2 and Example 4, and so on.

[0151]

[0152] Table 13 This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the virtual reality device described above.

[0153] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0154] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0155] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0156] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A virtual reality device, characterized in that, It consists of a first optical system and a second optical system that cooperate with each other. The first optical system consists of a first element group, a second element group and a third element group from a first side to a second side. The first element group consists of a first lens, the second element group consists of a second lens, and the third element group consists of a third lens, a reflective polarizing element and a quarter-wave plate attached to the third lens. The first side of the third lens is a plane, and at least a portion of the second side of the third lens is provided with a reflective film. The first optical system has a total of 3 lenses with optical power; the first lens has positive optical power, the second lens has positive optical power, and the third lens has positive optical power; or the first lens has positive optical power, the second lens has negative optical power, and the third lens has positive optical power. The second side surface of the first lens is convex; the first side surface of the second lens is concave; the second side surface of the second lens is convex; the second side surface of the third lens is convex. The first side of the first optical system is the imaging side, and the second side is the light source side. The image emitted by the light source is imaged on the image plane of the imaging side. The second optical system comprises, from the first side to the second side, a first lens with negative optical power, a second lens, a third lens with positive optical power, a fourth lens, a fifth lens, and a sixth lens with negative optical power. The optical power of the second lens is opposite in sign to that of the fourth lens, and the optical power of the fourth lens is opposite in sign to that of the fifth lens. The first side of the second optical system is the object side, and the second side is the image side. The second optical system contains a total of six lenses with optical power. The first side of the first lens is convex, and the second side of the first lens is concave. The second side of the second lens is convex. The first side of the third lens is convex, and the second side of the fifth lens is convex. The distance TDA between the first side surface of the first lens of the first optical system and the second side surface of the third lens on the optical axis and the distance TDB between the first side surface of the first lens of the second optical system and the second side surface of the sixth lens on the optical axis satisfy the following condition: 6.19 ≤ TDA / TDB ≤ 7.87; The minimum Abbe number VAmin of the three lenses in the first optical system, the maximum Abbe number VAmax of the three lenses in the first optical system, the minimum Abbe number VBmin of the six lenses in the second optical system, and the maximum Abbe number VBmax of the six lenses in the second optical system satisfy the following condition: 1.36≤(VAmin / VBmin) / (VAmax / VBmax)≤3.10; The effective radius DT11A of the first side surface of the first lens of the first optical system, the effective radius DT21A of the first side surface of the second lens of the first optical system, and the effective radius DT31A of the first side surface of the third lens of the first optical system satisfy the following: 5.04≤(DT31A-DT21A) / (DT21A-DT11A)≤5.

73.

2. The virtual reality device according to claim 1, characterized in that, The sum of the center thicknesses of the first lens to the third lens in the first optical system on the optical axis, ∑CTA, the sum of the center thicknesses of the first lens to the sixth lens in the second optical system, ∑CTB, the center thickness CTRP of the reflective polarizing element, and the center thickness CTQWP of the quarter-wave plate satisfy the following condition: 8.71≤(∑CTA+CTRP+CTQWP) / ∑CTB≤11.

36.

3. The virtual reality device according to claim 1, characterized in that, The effective focal length fA of the first optical system, the effective focal length fB of the second optical system, and the maximum half field of view HFOVA of the first optical system and the maximum half field of view HFOVB of the second optical system satisfy the following: 34.52mm≤fA*tan(HFOVA)-fB*tan(HFOVB)≤34.88mm.

4. The virtual reality device according to claim 1, characterized in that, The center thickness CT3A of the third lens of the first optical system on the optical axis, the center thickness CTRP of the reflective polarizing element, the center thickness CTQWP of the quarter-wave plate, the center thickness CT1A of the first lens of the first optical system on the optical axis, and the center thickness CT2A of the second lens of the first optical system on the optical axis satisfy the following: 1.64≤(CT3A+CTRP+CTQWP) / (CT1A+CT2A)≤2.

50.

5. The virtual reality device according to claim 1, characterized in that, The effective focal length fA of the first optical system, the numerical aperture fnoA of the first optical system, and half the diagonal length ImghA of the effective pixel area on the image plane of the first optical system satisfy the following condition: 7.44≤fA / ImghA*fnoA≤7.

52.

6. The virtual reality device according to claim 1, characterized in that, The radius of curvature R2A of the second side surface of the first lens of the first optical system and the radius of curvature R3A of the first side surface of the second lens of the first optical system satisfy the following condition: 0.82≤R2A / R3A≤1.

01.

7. The virtual reality device according to claim 1, characterized in that, The sum of the center thicknesses ∑CTA of the first lens to the third lens in the first optical system along the optical axis and the sum of the edge thicknesses ∑ETA of the first lens to the third lens in the first optical system satisfy the following condition: 1.89≤∑CTA / ∑ETA≤2.

33.

8. The virtual reality device according to any one of claims 1 to 7, characterized in that, The radius of curvature R6A of the second side surface of the third lens of the first optical system and the radius of curvature R4A of the second side surface of the second lens of the first optical system satisfy the following condition: 2.06≤(R6A+R4A) / (R6A-R4A)≤6.

77.

9. The virtual reality device according to any one of claims 1 to 7, characterized in that, The radius of curvature R1B of the first side surface of the first lens of the second optical system, the radius of curvature R2B of the second side surface of the first lens of the second optical system, and the effective focal length f1B of the first lens of the second optical system satisfy the following: -2.22≤f1B / (R1B+R2B)≤-1.

34.

10. The virtual reality device according to any one of claims 1 to 7, characterized in that, The distance TDB on the optical axis between the first side surface of the first lens and the second side surface of the sixth lens in the second optical system, the effective focal length fB of the second optical system, and the numerical aperture fnoB of the second optical system satisfy the following condition: 4.07≤TDB / fB*fnoB≤4.

59.

11. The virtual reality device according to any one of claims 1 to 7, characterized in that, The effective focal length f3B of the third lens of the second optical system and the effective focal length f6B of the sixth lens of the second optical system satisfy the following condition: 3.06≤|(f3B-f6B) / (f3B+f6B)|≤5.

17.

12. The virtual reality device according to any one of claims 1 to 7, characterized in that, The sum of the center thicknesses of the first lens to the sixth lens in the second optical system, ∑CTB, the maximum value of the center thicknesses of the first lens to the sixth lens in the second optical system, CTBmax, and the minimum value of the center thicknesses of the first lens to the sixth lens in the second optical system, CTBmin, satisfy the following condition: 2.59≤∑CTB / (CTBmax+CTBmin)≤3.

07.

13. The virtual reality device according to any one of claims 1 to 7, characterized in that, The effective radius DT11B of the first side surface of the first lens of the second optical system, the effective radius DT32B of the second side surface of the third lens of the second optical system, and the effective radius DT62B of the second side surface of the sixth lens of the second optical system satisfy the following: 1.34≤(DT62B-DT32B) / (DT11B-DT32B)≤1.

86.

14. A virtual reality device, characterized in that, It consists of a first optical system and a second optical system that cooperate with each other. The first optical system consists of a first element group, a second element group and a third element group from a first side to a second side. The first element group consists of a first lens, the second element group consists of a second lens, and the third element group consists of a third lens, a reflective polarizing element and a quarter-wave plate attached to the third lens. The first side of the third lens is a plane, and at least a portion of the second side of the third lens is provided with a reflective film. The first optical system has a total of 3 lenses with optical power; the first lens has positive optical power, the second lens has positive optical power, and the third lens has positive optical power; or the first lens has positive optical power, the second lens has negative optical power, and the third lens has positive optical power. The second side surface of the first lens is convex; the first side surface of the second lens is concave; the second side surface of the second lens is convex; the second side surface of the third lens is convex. The first side of the first optical system is the imaging side, and the second side is the light source side. The image emitted by the light source is imaged on the image plane of the imaging side. The second optical system comprises, from the first side to the second side, a first lens with negative optical power, a second lens, a third lens with positive optical power, a fourth lens, a fifth lens, and a sixth lens with negative optical power. The optical power of the second lens is opposite in sign to that of the fourth lens, and the optical power of the fourth lens is opposite in sign to that of the fifth lens. The first side of the second optical system is the object side, and the second side is the image side. The second optical system has a total of six lenses with optical power. The first side of the first lens is convex. The second lens has two concave sides; the second side of the second lens has a convex surface; the first side of the third lens has a convex surface; the second side of the fifth lens has a convex surface; the sum of the center thicknesses of the first lens to the third lens in the first optical system on the optical axis ∑CTA, the sum of the center thicknesses of the first lens to the sixth lens in the second optical system ∑CTB, the center thickness CTRP of the reflective polarizing element and the center thickness CTQWP of the quarter-wave plate satisfy: 8.71≤(∑CTA+CTRP+CTQWP) / ∑CTB≤11.36; The minimum Abbe number VAmin of the three lenses in the first optical system, the maximum Abbe number VAmax of the three lenses in the first optical system, the minimum Abbe number VBmin of the six lenses in the second optical system, and the maximum Abbe number VBmax of the six lenses in the second optical system satisfy the following condition: 1.36≤(VAmin / VBmin) / (VAmax / VBmax)≤3.10; The effective radius DT11A of the first side surface of the first lens of the first optical system, the effective radius DT21A of the first side surface of the second lens of the first optical system, and the effective radius DT31A of the first side surface of the third lens of the first optical system satisfy the following: 5.04≤(DT31A-DT21A) / (DT21A-DT11A)≤5.

73.

15. The virtual reality device according to claim 14, characterized in that, The effective focal length fA of the first optical system, the effective focal length fB of the second optical system, and the maximum half field of view HFOVA of the first optical system and the maximum half field of view HFOVB of the second optical system satisfy the following: 34.52mm≤fA*tan(HFOVA)-fB*tan(HFOVB)≤34.88mm.

16. The virtual reality device according to claim 14, characterized in that, The distance TDA between the first side surface of the first lens of the first optical system and the second side surface of the third lens on the optical axis and the distance TDB between the first side surface of the first lens of the second optical system and the second side surface of the sixth lens on the optical axis satisfy: 6.19≤TDA / TDB≤7.87; the center thickness CT3A of the third lens on the optical axis of the first optical system, the center thickness CTRP of the reflective polarizing element, the center thickness CTQWP of the quarter-wave plate, the center thickness CT1A of the first lens on the optical axis of the first optical system, and the center thickness CT2A of the second lens on the optical axis of the first optical system satisfy: 1.64≤(CT3A+CTRP+CTQWP) / (CT1A+CT2A)≤2.

50.

17. The virtual reality device according to claim 14, characterized in that, The effective focal length fA of the first optical system, the numerical aperture fnoA of the first optical system, and half the diagonal length ImghA of the effective pixel area on the image plane of the first optical system satisfy the following condition: 7.44≤fA / ImghA*fnoA≤7.

52.

18. The virtual reality device according to claim 14, characterized in that, The radius of curvature R2A of the second side surface of the first lens of the first optical system and the radius of curvature R3A of the first side surface of the second lens of the first optical system satisfy the following condition: 0.82≤R2A / R3A≤1.

01.

19. The virtual reality device according to claim 14, characterized in that, The sum of the center thicknesses ∑CTA of the first lens to the third lens in the first optical system along the optical axis and the sum of the edge thicknesses ∑ETA of the first lens to the third lens in the first optical system satisfy the following condition: 1.89≤∑CTA / ∑ETA≤2.

33.

20. The virtual reality device according to any one of claims 14 to 19, characterized in that, The radius of curvature R6A of the second side surface of the third lens of the first optical system and the radius of curvature R4A of the second side surface of the second lens of the first optical system satisfy the following condition: 2.06≤(R6A+R4A) / (R6A-R4A)≤6.

77.

21. The virtual reality device according to any one of claims 14 to 19, characterized in that, The radius of curvature R1B of the first side surface of the first lens of the second optical system, the radius of curvature R2B of the second side surface of the first lens of the second optical system, and the effective focal length f1B of the first lens of the second optical system satisfy the following: -2.22≤f1B / (R1B+R2B)≤-1.

34.

22. The virtual reality device according to any one of claims 14 to 19, characterized in that, The distance TDB on the optical axis between the first side surface of the first lens and the second side surface of the sixth lens in the second optical system, the effective focal length fB of the second optical system, and the numerical aperture fnoB of the second optical system satisfy the following condition: 4.07≤TDB / fB*fnoB≤4.

59.

23. The virtual reality device according to any one of claims 14 to 19, characterized in that, The effective focal length f3B of the third lens of the second optical system and the effective focal length f6B of the sixth lens of the second optical system satisfy the following condition: 3.06≤|(f3B-f6B) / (f3B+f6B)|≤5.

17.

24. The virtual reality device according to any one of claims 14 to 19, characterized in that, The sum of the center thicknesses of the first lens to the sixth lens in the second optical system, ∑CTB, the maximum value of the center thicknesses of the first lens to the sixth lens in the second optical system, CTBmax, and the minimum value of the center thicknesses of the first lens to the sixth lens in the second optical system, CTBmin, satisfy the following condition: 2.59≤∑CTB / (CTBmax+CTBmin)≤3.

07.

25. The virtual reality device according to any one of claims 14 to 19, characterized in that, The effective radius DT11B of the first side surface of the first lens of the second optical system, the effective radius DT32B of the second side surface of the third lens of the second optical system, and the effective radius DT62B of the second side surface of the sixth lens of the second optical system satisfy the following: 1.34≤(DT62B-DT32B) / (DT11B-DT32B)≤1.86.

Images