VR visual system and imaging device

Abstract

This invention provides a VR visual system and imaging device. The VR visual system includes: a first optical element comprising at least a first lens; a second optical element having positive optical power and comprising at least a second lens; a third optical element comprising at least a third lens; a second spacer located between the second and third optical elements; the first to third optical elements are arranged sequentially along the optical axis of the VR visual system, with the third optical element closer to the light source relative to the second lens; at least one lens has a partially reflective layer on its eye-side or display-side surface; the radius of curvature R4 of the display-side surface of the second lens, the radius of curvature R5 of the eye-side surface of the third lens, the maximum outer diameter D2m of the display-side surface of the second spacer, and the minimum inner diameter d2s of the eye-side surface of the second spacer satisfy the following: -90 < (R4 + R5) / (D2m - d2s) < -20. This invention solves the problem in the prior art where miniaturization and yield are difficult to achieve simultaneously in VR lenses.

Description

Technical Field

[0001] This invention relates to the field of VR device technology, and more specifically, to a VR visual system and imaging device. Background Technology

[0002] With the advancement of technology, the concept of a "metaverse" has emerged. Virtual Reality (VR) is an indispensable technology in realizing the metaverse, and optical lenses play a crucial role in VR. As VR devices become increasingly miniaturized, the VR lenses integrated into them are also gradually becoming smaller. However, the lenses mounted in these miniaturized VR lenses are prone to assembly instability due to their sensitivity, resulting in low assembly yield. Furthermore, the small size of the lenses used in VR lenses makes assembly difficult, easily leading to poor image quality in the assembled product, further contributing to low VR lens yield.

[0003] In other words, existing VR lenses face the challenge of balancing miniaturization and high yield rates. Summary of the Invention

[0004] The main objective of this invention is to provide a VR visual system and imaging device to solve the problem of miniaturization and yield in VR lenses in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a VR visual system is provided, which is capable of receiving light from a light source. The VR visual system includes: a first optical element, which includes at least a first lens; a second optical element having positive optical power and including at least a second lens; a third optical element, which includes at least a third lens; and a second spacer located between the second and third optical elements. The first to third optical elements are arranged sequentially along the optical axis of the VR visual system, and the third optical element... The element is close to the light source relative to the second lens; wherein, all lenses in the first to third optical elements have at least one eye-side surface away from the light source and at least one display-side surface close to the light source, and at least one eye-side surface or display-side surface of the lens has a partial reflective layer; the radius of curvature R4 of the display-side surface of the second lens, the radius of curvature R5 of the eye-side surface of the third lens, the maximum outer diameter D2m of the display-side surface of the second spacer and the minimum inner diameter d2s of the eye-side surface of the second spacer satisfy: -90<(R4+R5) / (D2m-d2s)<-20.

[0006] Further, the second optical element further includes: a reflective polarizing element located on one side of the second lens, the reflective polarizing element having at least one eye-side surface away from the light source and at least one display-side surface close to the light source; a quarter-wave plate having at least one eye-side surface away from the light source and at least one display-side surface close to the light source, and at least a part of the display-side surface of the reflective polarizing element is in contact with the eye-side surface of the quarter-wave plate.

[0007] Further, the partial reflection layer is located on the display-side surface of the second lens or the eye-side surface of the third lens.

[0008] Further, the VR visual system further includes an auxiliary spacer, and the auxiliary spacer partially abuts against the display-side surface of the second spacer.

[0009] Further, the minimum inner diameter d2s of the eye-side surface of the second spacer, the minimum inner diameter d2m of the display-side surface of the second spacer, the radius of curvature R4 of the display-side surface of the second lens, and the radius of curvature R5 of the eye-side surface of the third lens satisfy: 0 < (d2s / R4) × (d2m / R5) < 3.

[0010] Further, the VR visual system further includes a barrel, and the first to third optical elements are accommodated in the barrel. The effective focal length f of the VR visual system, the minimum inner diameter d0s of the eye-side surface of the barrel, and the minimum inner diameter d0m of the display-side surface of the barrel satisfy: -2 < f / (d0s - d0m) < 2, where f / (D0m - D0s) is not equal to 0.

[0011] Further, the VR visual system further includes a barrel, and the first to third optical elements are accommodated in the barrel. The effective focal length f of the VR visual system, the maximum inner diameter D0s of the eye-side surface of the barrel, and the maximum inner diameter D0m of the display-side surface of the barrel satisfy: -10 < f / (D0m - D0s) < 10, where f / (D0m - D0s) is not equal to 0.

[0012] Further, the VR visual system further includes a barrel, and the first to third optical elements are accommodated in the barrel. The distance TD on the optical axis from the eye-side surface of the first optical element to the display-side surface of the third optical element, the maximum outer diameter D0s of the eye-side surface of the barrel, and the minimum inner diameter d0s of the eye-side surface of the barrel satisfy: 0 < TD / (D0s - d0s) < 10.

[0013] Furthermore, the VR visual system also includes a lens barrel, in which the first to third optical elements are housed. The distance TD between the eye-side surface of the first optical element and the display-side surface of the third optical element on the optical axis, the distance L between the eye-side surface and the display-side surface of the lens barrel on the optical axis, the thickness CP2 of the second spacer, and the distance T23 between the display-side surface of the second lens and the eye-side surface of the third lens on the optical axis satisfy the following: 0 <CP2 / T23-L / TD<100。

[0014] Furthermore, the thickness CP2 of the second spacer, the effective focal length F2 of the second optical element, and the effective focal length f3 of the third lens satisfy the following condition: 10 < (F2 - f3) / CP2 < 200.

[0015] Furthermore, the VR visual system also includes a first spacer located between the first optical element and the second optical element. The effective focal length f1 of the first lens, the minimum inner diameter d1s of the eye-side surface of the first spacer, and the maximum outer diameter D1s of the eye-side surface of the first spacer satisfy the following relationship: 10 <f1 / (D1s-d1s)<80。

[0016] Furthermore, the VR visual system also includes a lens barrel, in which the first to third optical elements are housed. The effective focal length f1 of the first lens, the effective focal length F2 of the second optical element, the distance EP01 from the lens barrel to the eye-side surface of the first spacer, and the distance EP12 from the display-side surface of the first spacer to the eye-side surface of the second spacer satisfy the following condition: 20 <f1 / EP01+F2 / EP12<90。

[0017] According to another aspect of the present invention, a VR visual system is provided, which is capable of receiving light from a light source. The VR visual system includes: a first optical element, which includes at least a first lens; a second optical element, which has positive optical power and includes at least a second lens; a third optical element, which includes at least a third lens; and a second spacer located between the second and third optical elements. The first to third optical elements are arranged sequentially along the optical axis of the VR visual system, and the third optical element is closer to the light source than the second lens. All lenses in the first to third optical elements have at least one eye-side surface away from the light source and at least one display-side surface close to the light source. At least one lens has a partially reflective layer on its eye-side surface or display-side surface. The minimum inner diameter d2s of the eye-side surface of the second spacer, the minimum inner diameter d2m of the display-side surface of the second spacer, the radius of curvature R4 of the display-side surface of the second lens, and the radius of curvature R5 of the eye-side surface of the third lens satisfy the following: 0 < (d2s / R4) × (d2m / R5) < 3.

[0018] Further, the second optical element further includes: a reflective polarizing element located on one side of the second lens, the reflective polarizing element having at least one eye side surface away from the light source and at least one display side surface close to the light source; a quarter-wave plate having at least one eye side surface away from the light source and at least one display side surface close to the light source, and at least a part of the display side surface of the reflective polarizing element is in contact with the eye side surface of the quarter-wave plate.

[0019] Further, the partial reflection layer is located on the display side surface of the second lens or the eye side surface of the third lens.

[0020] Further, the VR visual system further includes an auxiliary spacer, and the auxiliary spacer partially abuts against the display side surface of the second spacer.

[0021] Further, the VR visual system further includes a barrel, and the first to third optical elements are accommodated in the barrel. The effective focal length f of the VR visual system, the minimum inner diameter d0s of the eye side surface of the barrel, and the minimum inner diameter d0m of the display side surface of the barrel satisfy: -2 < f / (d0s - d0m) < 2, where f / (d0s - d0m) is not equal to 0.

[0022] Further, the VR visual system further includes a barrel, and the first to third optical elements are accommodated in the barrel. The effective focal length f of the VR visual system, the maximum inner diameter D0s of the eye side surface of the barrel, and the maximum inner diameter D0m of the display side surface of the barrel satisfy: -10 < f / (D0m - D0s) < 10, where f / (D0m - D0s) is not equal to 0.

[0023] Further, the VR visual system further includes a barrel, and the first to third optical elements are accommodated in the barrel. The distance TD on the optical axis from the eye side surface of the first optical element to the display side surface of the third optical element, the maximum outer diameter D0s of the eye side surface of the barrel, and the minimum inner diameter d0s of the eye side surface of the barrel satisfy: 0 < TD / (D0s - d0s) < 10.

[0024] Further, the VR visual system further includes a barrel, and the first to third optical elements are accommodated in the barrel. The distance TD on the optical axis from the eye side surface of the first optical element to the display side surface of the third optical element, the distance L on the optical axis between the eye side surface and the display side surface of the barrel, the thickness CP2 of the second spacer, and the distance T23 on the optical axis between the display side surface of the second lens and the eye side surface of the third lens satisfy: 0 < CP2 / T23 - L / TD <100.

[0025] Furthermore, the thickness CP2 of the second spacer, the effective focal length F2 of the second optical element, and the effective focal length f3 of the third lens satisfy the following condition: 10 < (F2 - f3) / CP2 < 200.

[0026] Furthermore, the VR visual system also includes a first spacer located between the first optical element and the second optical element. The effective focal length f1 of the first lens, the minimum inner diameter d1s of the eye-side surface of the first spacer, and the maximum outer diameter D1s of the eye-side surface of the first spacer satisfy the following relationship: 10 <f1 / (D1s-d1s)<80。

[0027] Furthermore, the VR visual system also includes a lens barrel, in which the first to third optical elements are housed. The effective focal length f1 of the first lens, the effective focal length F2 of the second optical element, the distance EP01 from the lens barrel to the eye-side surface of the first spacer, and the distance EP12 from the display-side surface of the first spacer to the eye-side surface of the second spacer satisfy the following condition: 20 <f1 / EP01+F2 / EP12<90。

[0028] According to another aspect of the present invention, an imaging device is provided, including the above-described VR visual system.

[0029] According to the technical solution of this invention, the VR visual system can receive light from a light source. The VR visual system includes a first optical element, a second optical element, a second spacer, and a third optical element. The first optical element includes at least a first lens. The second optical element has positive optical power and includes at least a second lens. The third optical element includes at least a third lens. The second spacer is located between the second and third optical elements. The first to third optical elements are arranged sequentially along the optical axis of the VR visual system, and the third optical element is closer to the light source than the second lens. All lenses in the first to third optical elements have at least one eye-side surface away from the light source and at least one display-side surface close to the light source. At least one lens has a partially reflective layer on its eye-side surface or display-side surface. The radius of curvature R4 of the display-side surface of the second lens, the radius of curvature R5 of the eye-side surface of the third lens, the maximum outer diameter D2m of the display-side surface of the second spacer, and the minimum inner diameter d2s of the eye-side surface of the second spacer satisfy the following: -90 < (R4 + R5) / (D2m - d2s) < -20.

[0030] By incorporating a partial reflective layer on the eye-side surface and / or display-side surface of the lens, light can be reflected within the VR visual system, thereby increasing the optical path length without increasing the overall optical length, which is beneficial for miniaturization. Controlling the radius of curvature of the display-side surface of the second lens and the eye-side surface of the third lens helps reduce their sensitivity, improving the assembly yield of the VR visual system while maintaining image quality. Simultaneously limiting the maximum outer diameter of the display-side surface of the second spacer and the minimum inner diameter of the eye-side surface of the second spacer ensures the manufacturability of the second spacer and improves the yield of the VR visual system. Attached Figure Description

[0031] 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:

[0032] Figure 1 A schematic diagram of the structure of a VR viewing system according to an optional embodiment of the present invention is shown;

[0033] Figure 2 A light path diagram of the VR viewing system of Example 1 of the present invention is shown;

[0034] Figures 3 to 5 The following are schematic diagrams of the VR visual system of Example 1 of the present invention in the first state, the second state and the third state;

[0035] Figures 6 to 8 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Example 1 of the present invention are shown respectively.

[0036] Figure 9 A light path diagram of the VR visual system of Example 2 of the present invention is shown;

[0037] Figures 10 to 12 The following are schematic diagrams of the VR visual system of Example 2 of the present invention in the first state, the second state and the third state;

[0038] Figures 13 to 15 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Example 2 of the present invention are shown respectively.

[0039] Figure 16 A light path diagram of the VR visual system of Example 3 of the present invention is shown;

[0040] Figures 17 to 19 The following are schematic diagrams of the VR visual system of Example 3 of the present invention in the first state, the second state, and the third state;

[0041] Figures 20 to 22 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Example 3 of the present invention are shown respectively.

[0042] The above figures include the following reference numerals:

[0043] E1, First lens; S1, Eye-side surface of the first lens; S2, Display-side surface of the first lens; RP, Reflective polarizing element; S3, Eye-side surface of the reflective polarizing element; S4, Display-side surface of the reflective polarizing element (eye-side surface of the quarter-wave plate); QWP, Quarter-wave plate; S5, Display-side surface of the quarter-wave plate (eye-side surface of the second lens); E2, Second lens; S6, Display-side surface of the second lens; E3, Third lens; S7, Eye-side surface of the third lens; S8, Display-side surface of the third lens; BS, Partial reflective layer; P0, Lens barrel; P1, First spacer; P2, Second spacer; P2b, Auxiliary spacer. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that 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 that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those skilled in the art, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens data in optical software) to determine convexity or concavity. For the eye-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 display-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.

[0050] To address the challenge of balancing miniaturization and yield in existing VR lenses, this invention provides a VR visual system and imaging device.

[0051] like Figures 1 to 22 As shown, the VR visual system can receive light from a light source. The VR visual system includes a first optical element, a second optical element, a second spacer, and a third optical element. The first optical element includes at least a first lens. The second optical element has positive optical power and includes at least a second lens. The third optical element includes at least a third lens. The second spacer is located between the second and third optical elements. The first to third optical elements are arranged sequentially along the optical axis of the VR visual system, and the third optical element is closer to the light source than the second lens. All lenses in the first to third optical elements have at least one eye-side surface away from the light source and at least one display-side surface close to the light source. At least one lens has a partially reflective layer on its eye-side surface or display-side surface. The radius of curvature R4 of the display-side surface of the second lens, the radius of curvature R5 of the eye-side surface of the third lens, the maximum outer diameter D2m of the display-side surface of the second spacer, and the minimum inner diameter d2s of the eye-side surface of the second spacer satisfy the following: -90 < (R4 + R5) / (D2m - d2s) < -20.

[0052] By incorporating a partial reflective layer on the eye-side surface and / or display-side surface of the lens, light can be reflected within the VR visual system, thereby increasing the optical path length without increasing the overall optical length, which is beneficial for miniaturization. Controlling the radius of curvature of the display-side surface of the second lens and the eye-side surface of the third lens helps reduce their sensitivity, improving the assembly yield of the VR visual system while maintaining image quality. Simultaneously limiting the maximum outer diameter of the display-side surface of the second spacer and the minimum inner diameter of the eye-side surface of the second spacer ensures the manufacturability of the second spacer and improves the yield of the VR visual system.

[0053] It should be noted that the light source can be understood as a display. Along the direction from the human eye to the display, the first optical element, the second optical element, and the third optical element are arranged in sequence. That is to say, the surface closer to the display is the display side surface, and the surface closer to the human eye (the surface away from the light source) is the eye side surface.

[0054] Preferably, the radius of curvature R4 of the display side surface of the second lens, the radius of curvature R5 of the eye side surface of the third lens, the maximum outer diameter D2m of the display side surface of the second spacer and the minimum inner diameter d2s of the eye side surface of the second spacer satisfy the following: -75 < (R4 + R5) / (D2m - d2s) < -22.

[0055] In this embodiment, the second optical element further includes a reflective polarizing element and a quarter-wave plate. The reflective polarizing element is located on one side of the second lens and has at least one eye-side surface away from the light source and at least one display-side surface near the light source. The quarter-wave plate also has at least one eye-side surface away from the light source and at least one display-side surface near the light source. The display-side surface of the reflective polarizing element is at least partially in contact with the eye-side surface of the quarter-wave plate. By using thin-film composite technology to integrate the display-side surface of the reflective polarizing element and the eye-side surface of the quarter-wave plate, the film bonding process can be simplified. The quarter-wave plate is disposed on the eye-side surface of the second lens. The reflective polarizing element can reflect light in a certain polarization direction while transmitting light orthogonal to that polarization direction. The quarter-wave plate can add a phase delay to the polarized light, thereby changing the polarization state of the light and allowing light to pass through the reflective polarizing element while extending the optical path.

[0056] like Figure 2 , Figure 9 and Figure 16 As shown, a partial reflective layer is located on the display-side surface of the second lens or the eye-side surface of the third lens. The partial reflective layer reflects some light while transmitting the rest. Utilizing the transmission and reflection properties of the partial reflective layer, a folding effect is achieved in the imaging optical path, increasing the imaging quality of the VR visual system without increasing its overall length.

[0057] In this embodiment, the VR visual system further includes an auxiliary spacer, which rests against the display-side surface of the second spacer. The auxiliary spacer further enhances the support for the lens, thereby improving the reliability and stability of the VR visual system.

[0058] In this embodiment, the following relationship is satisfied among the minimum inner diameter d2s of the object side surface of the second spacer, the minimum inner diameter d2m of the display side surface of the second spacer, the radius of curvature R4 of the display side surface of the second lens, and the radius of curvature R5 of the object side surface of the third lens: 0 < (d2s / R4) × (d2m / R5) < 3. By controlling the radii of curvature of the display side surface of the second lens and the object side surface of the third lens, it is beneficial to reduce the sensitivity of the second lens and the third lens, so as to improve the assembly yield. Secondly, by controlling the minimum inner diameters of the object side surface and the display side surface of the second spacer, while ensuring the support for the lens, the machinability of the second spacer is ensured, further improving the yield of the VR visual system. Preferably, 2.2 < (d2s / R4) × (d2m / R5) < 2.95.

[0059] In this embodiment, the VR visual system further includes a lens barrel, and the first to third optical elements are accommodated in the lens barrel. The following relationship is satisfied among the effective focal length f of the VR visual system, the minimum inner diameter d0s of the object side surface of the lens barrel, and the minimum inner diameter d0m of the display side surface of the lens barrel: -2 < f / (d0s - d0m) < 2, where f / (d0s - d0m) is not equal to 0. By controlling the effective focal length of the VR visual system, the field angle of the system is effectively constrained, so that the system meets the characteristics of a large field of view of the VR lens; at the same time, by restricting the minimum inner diameter of the object side surface and the minimum inner diameter of the display side surface of the lens barrel, the light incident amount can be effectively controlled, improving the utilization rate of light. The control of the inner diameter size of the rear end face of the lens barrel can better change the reflection route of the redundant light, reduce stray light, and improve the imaging clarity. Preferably, -1.55 < f / (d0s - d0m) < 1.8.

[0060] In this embodiment, the VR visual system further includes a lens barrel, and the first to third optical elements are accommodated in the lens barrel. The following relationship is satisfied among the effective focal length f of the VR visual system, the maximum inner diameter D0s of the object side surface of the lens barrel, and the maximum inner diameter D0m of the display side surface of the lens barrel: -10 < f / (D0m - D0s) < 10, where f / (D0m - D0s) is not equal to 0. By controlling f / (D0m - D0s) within a reasonable range, while ensuring the optical performance of the VR visual system, the wall thickness of the lens barrel is effectively controlled, and the simplicity of the lens barrel structure and its machinability are considered concurrently. Preferably, -8 < f / (D0m - D0s) < 6.

[0061] In this embodiment, the VR visual system further includes a lens barrel. The first to third optical elements are accommodated in the lens barrel. The distance TD on the optical axis from the ocular-side surface of the first optical element to the display-side surface of the third optical element, the maximum outer diameter D0s of the ocular-side surface of the lens barrel, and the minimum inner diameter d0s of the ocular-side surface of the lens barrel satisfy: 0 < TD / (D0s - d0s) < 10. By controlling the distance on the optical axis from the ocular-side surface of the first optical element to the display-side surface of the third optical element of the VR visual system, it is beneficial to control the overall length of the VR visual system within a reasonable range. Further, by controlling the maximum outer diameter and the minimum inner diameter values of the ocular-side surface of the lens barrel, it is beneficial to control the radial dimension of the VR visual system within a reasonable range, and thus it is beneficial for the VR visual system to achieve miniaturization. Preferably, 0.8 < TD / (D0s - d0s) < 9.0.

[0062] In this embodiment, the VR visual system further includes a lens barrel. The first to third optical elements are accommodated in the lens barrel. The distance TD on the optical axis from the ocular-side surface of the first optical element to the display-side surface of the third optical element, the distance L on the optical axis between the ocular-side surface and the display-side surface of the lens barrel, the thickness CP2 of the second spacer, and the distance T23 on the optical axis between the display-side surface of the second lens and the ocular-side surface of the third lens satisfy: 0 < CP2 / T23 - L / TD < 100. By controlling CP2 / T23 - L / TD within a reasonable range, on the one hand, it is possible to control the thickness of the second spacer, avoid the second spacer being too thick or too thin, and ensure the support of the second spacer to the lens while ensuring the machinability of the second spacer; on the other hand, it is possible to control the overall length of the lens barrel, minimize the length of the lens barrel as much as possible, and thus reduce the overall size of the entire VR visual system. Preferably, 7.5 < CP2 / T23 - L / TD < 83.

[0063] In this embodiment, the thickness CP2 of the second spacer, the effective focal length F2 of the second optical element, and the effective focal length f3 of the third lens satisfy: 10 < (F2 - f3) / CP2 < 200. By controlling the effective focal length F2 of the second optical element and the effective focal length f3 of the third lens, it is beneficial to optimize the light path, reduce light loss, and ensure imaging quality. Secondly, by restricting the thickness of the second spacer, it is possible to avoid the thickness of the second spacer being too large or too small and ensure the machinability of the second spacer. Preferably, 12 < (F2 - f3) / CP2 < 167.

[0064] In this embodiment, the VR visual system further includes a first spacer. The first spacer is located between the first optical element and the second optical element. The following relationship is satisfied among the effective focal length f1 of the first lens, the minimum inner diameter d1s of the ocular-side surface of the first spacer, and the maximum outer diameter D1s of the ocular-side surface of the first spacer: 10 < f1 / (D1s - d1s) < 80. By controlling the effective focal length of the first lens within a certain range, the VR visual system has good imaging quality on the axis. At the same time, by controlling the maximum outer diameter and the minimum inner diameter of the ocular-side surface of the first spacer, while ensuring its supporting function, the machinability of the first spacer is improved. Preferably, 17 < f1 / (D1s - d1s) < 62.

[0065] In this embodiment, the VR visual system further includes a barrel. The first optical element to the third optical element are accommodated in the barrel. The following relationship is satisfied among the effective focal length f1 of the first lens, the effective focal length F2 of the second optical element, the distance EP01 from the barrel to the ocular-side surface of the first spacer, and the distance EP12 from the display-side surface of the first spacer to the ocular-side surface of the second spacer: 20 < f1 / EP01 + F2 / EP12 < 90. By controlling the focal lengths of the first lens and the second optical element, the optical power is reasonably distributed. At the same time, by controlling the distance from the ocular-side surface of the barrel to the ocular-side surface of the first spacer and the distance from the display-side surface of the first spacer to the ocular-side surface of the second spacer, it is ensured that the first lens and the second lens are not too thin or too thick, ensuring the strength of the optical elements, and at the same time facilitating the control of the overall thickness of the VR visual system. Preferably, 20 < f1 / EP01 + F2 / EP12 < 85.

[0066] Embodiment Two

[0067] As Figures 1 to 22 shown, the VR visual system can receive light from a light source. The VR visual system includes a first optical element, a second optical element, a second spacer, and a third optical element. The first optical element at least includes a first lens; the second optical element has a positive optical power and at least includes a second lens; the third optical element at least includes a third lens; the second spacer is located between the second optical element and the third optical element; the first optical element to the third optical element are arranged in sequence along the optical axis of the VR visual system, and the third optical element is closer to the light source relative to the second lens; wherein, all the lenses in the first optical element to the third optical element have at least one ocular-side surface away from the light source and at least one display-side surface close to the light source, and at least one of the ocular-side surfaces or display-side surfaces of the lenses has a partial reflection layer; the following relationship is satisfied among the minimum inner diameter d2s of the ocular-side surface of the second spacer, the minimum inner diameter d2m of the display-side surface of the second spacer, the curvature radius R4 of the display-side surface of the second lens, and the curvature radius R5 of the ocular-side surface of the third lens: 0 < (d2s / R4)×(d2m / R5) < 3.

[0068] By providing a partial reflective layer on the eye-side surface and / or display-side surface of the lens, light can be reflected within the VR visual system, thereby increasing the optical path length without increasing the overall optical length. This facilitates miniaturization of the VR visual system while maintaining imaging quality. Controlling the curvature radii of the display-side surface of the second lens and the eye-side surface of the third lens helps reduce their sensitivity, improving the assembly yield of the VR visual system while still ensuring imaging quality. Furthermore, limiting the maximum outer diameter of the display-side surface of the second spacer and the minimum inner diameter of the eye-side surface of the second spacer ensures the manufacturability of the second spacer.

[0069] Preferably, the minimum inner diameter d2s of the eye-side surface of the second spacer, the minimum inner diameter d2m of the display-side surface of the second spacer, the radius of curvature R4 of the display-side surface of the second lens, and the radius of curvature R5 of the eye-side surface of the third lens satisfy the following: 2.2 < (d2s / R4) × (d2m / R5) < 2.95.

[0070] In this embodiment, the second optical element further includes a reflective polarizer and a quarter-wave plate. The reflective polarizer is located on one side of the second lens and has at least one eye-side surface away from the light source and at least one display-side surface near the light source. The quarter-wave plate also has at least one eye-side surface away from the light source and at least one display-side surface near the light source. The display-side surface of the reflective polarizer is in at least partial contact with the eye-side surface of the quarter-wave plate. By using thin-film composite technology to integrate the display-side surface of the reflective polarizer and the eye-side surface of the quarter-wave plate, the film bonding process can be simplified. The quarter-wave plate is disposed on the eye-side surface of the second lens. The reflective polarizer can reflect light in a certain polarization direction while transmitting light orthogonal to that polarization direction. The quarter-wave plate can add a phase delay to the polarized light, thereby changing the polarization state of the light and allowing light to pass through the reflective polarizer while extending the optical path.

[0071] like Figure 2 , Figure 9 and Figure 16 As shown, a partial reflective layer is located on the display-side surface of the second lens or the eye-side surface of the third lens. The partial reflective layer reflects some light while transmitting the rest. Utilizing the transmission and reflection properties of the partial reflective layer, a folding effect is achieved in the imaging optical path, increasing the imaging quality of the VR visual system without increasing its overall length.

[0072] In this embodiment, the VR visual system further includes an auxiliary spacer, and the auxiliary spacer abuts against a part of the display side surface of the second spacer. The setting of the auxiliary spacer can further improve the support for the lens and enhance the reliability and stability of the VR visual system.

[0073] In this embodiment, the VR visual system further includes a lens barrel, and the first to third optical elements are accommodated in the lens barrel. The effective focal length f of the VR visual system, the minimum inner diameter d0s of the ocular side surface of the lens barrel, and the minimum inner diameter d0m of the display side surface of the lens barrel satisfy: -2 < f / (d0s - d0m) < 2, where f / (d0s - d0m) is not equal to 0. By controlling the effective focal length of the VR visual system, the field angle of the system is effectively constrained, enabling the system to meet the characteristics of a large field of view of the VR lens; at the same time, by restricting the minimum inner diameter of the ocular side surface and the minimum inner diameter of the display side surface of the lens barrel, the light input amount can be effectively controlled, improving the utilization rate of light. Controlling the inner diameter size of the rear end face of the lens barrel can better change the reflection route of excess light, reduce stray light, and improve the clarity of imaging. Preferably, 1.55 < f / (d0s - d0m) < 1.8.

[0074] In this embodiment, the VR visual system further includes a lens barrel, and the first to third optical elements are accommodated in the lens barrel. The effective focal length f of the VR visual system, the maximum inner diameter D0s of the ocular side surface of the lens barrel, and the maximum inner diameter D0m of the display side surface of the lens barrel satisfy: -10 < f / (D0m - D0s) < 10, where f / (D0m - D0s) is not equal to 0. By controlling f / (D0m - D0s) within a reasonable range, while ensuring the optical performance of the VR visual system, the wall thickness of the lens barrel can be effectively controlled, and the simplicity of the lens barrel structure and its machinability are considered concurrently. Preferably, -8 < f / (D0m - D0s) < 6.

[0075] In this embodiment, the VR visual system further includes a lens barrel, and the first to third optical elements are accommodated in the lens barrel. The distance TD on the optical axis from the ocular side surface of the first optical element to the display side surface of the third optical element, the maximum outer diameter D0s of the ocular side surface of the lens barrel, and the minimum inner diameter d0s of the ocular side surface of the lens barrel satisfy: 0 < TD / (D0s - d0s) < 10. By controlling the distance on the optical axis from the ocular side surface of the first optical element to the display side surface of the third optical element of the VR visual system, it is beneficial to control the overall length of the VR visual system within a reasonable range. Further, by controlling the maximum outer diameter and minimum inner diameter values of the ocular side surface of the lens barrel, it is beneficial to control the radial size of the VR visual system within a reasonable range, thereby facilitating the miniaturization of the VR visual system. Preferably, 0.8 < TD / (D0s - d0s) < 9.0.

[0076] In this embodiment, the VR visual system further includes a lens barrel. The first to third optical elements are accommodated in the lens barrel. The distance TD on the optical axis from the ocular side surface of the first optical element to the display side surface of the third optical element, the distance L on the optical axis between the ocular side surface of the lens barrel and the display side surface of the lens barrel, the thickness CP2 of the second spacer, and the distance T23 on the optical axis between the display side surface of the second lens and the ocular side surface of the third lens satisfy: 0 < CP2 / T23 - L / TD < 100. By controlling CP2 / T23 - L / TD within a reasonable range, on the one hand, the thickness of the second spacer can be controlled to avoid the second spacer being too thick or too thin, ensuring the support of the second spacer on the lens while guaranteeing the processability of the second spacer; on the other hand, the overall length of the lens barrel can be controlled to minimize the length of the lens barrel as much as possible, thereby reducing the overall size of the entire VR visual system. Preferably, 7.5 < CP2 / T23 - L / TD < 83.

[0077] In this embodiment, the thickness CP2 of the second spacer, the effective focal length F2 of the second optical element, and the effective focal length f3 of the third lens satisfy: 10 < (F2 - f3) / CP2 < 200. By controlling the effective focal length F2 of the second optical element and the effective focal length f3 of the third lens, it is beneficial to optimize the light path, reduce light loss, and ensure imaging quality. Secondly, restricting the thickness of the second spacer can avoid the thickness of the second spacer being too large or too small, ensuring the processability of the second spacer. Preferably, 12 < (F2 - f3) / CP2 < 167.

[0078] In this embodiment, the VR visual system further includes a first spacer located between the first optical element and the second optical element. The effective focal length f1 of the first lens, the minimum inner diameter d1s of the ocular side surface of the first spacer, and the maximum outer diameter D1s of the ocular side surface of the first spacer satisfy: 10 < f1 / (D1s - d1s) < 80. By controlling the effective focal length of the first lens within a certain range, the VR visual system has good on-axis imaging quality; at the same time, by controlling the maximum outer diameter and minimum inner diameter of the ocular side surface of the first spacer, the processability of the first spacer is improved while ensuring its supporting function. Preferably, 17 < f1 / (D1s - d1s) < 62.

[0079] In this embodiment, the VR visual system further includes a lens barrel. The first to third optical elements are accommodated in the lens barrel. The following relationship is satisfied among the effective focal length f1 of the first lens, the effective focal length F2 of the second optical element, the distance EP01 from the lens barrel to the ocular-side surface of the first spacer, and the distance EP12 from the display-side surface of the first spacer to the ocular-side surface of the second spacer: 20 < f1 / EP01 + F2 / EP12 < 90. By controlling the focal lengths of the first lens and the second optical element, the optical power is reasonably distributed. At the same time, by controlling the distances from the ocular-side surface of the lens barrel to the ocular-side surface of the first spacer and from the display-side surface of the first spacer to the ocular-side surface of the second spacer, it is ensured that the first lens and the second lens are not too thin or too thick, ensuring the strength of the optical elements and being beneficial to controlling the overall thickness of the VR visual system. Preferably, 20 < f1 / EP01 + F2 / EP12 < 85.

[0080] In an alternative embodiment, the imaging device includes the above VR visual system. The imaging device with the above VR visual system has the characteristics of high imaging quality and miniaturization.

[0081] The VR visual system in the present application can adopt multiple lenses, such as the three lenses described above. By reasonably distributing the effective focal lengths, surface shapes, central thicknesses of each lens, and the on-axis distances between each lens, etc., the aperture of the VR visual system can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the VR visual system more conducive to production and processing and applicable to portable electronic devices such as smart phones.

[0082] In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature continuously changes from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After adopting an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0083] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of lenses constituting the VR visual system can be changed to obtain the various results and advantages described in this specification. For example, although the three-lens case is described in the embodiments, the VR visual system is not limited to including three lenses. If necessary, the VR visual system can also include other numbers of lenses.

[0084] Figure 1 A schematic structural diagram of a VR visual system of the present application is shown. Figure 1The diagram also labels parameters such as d0s to clearly and intuitively explain their meaning. To better illustrate the structure and specific surface features of the VR visual system, these parameters will not be shown in the accompanying diagrams when explaining specific examples.

[0085] Where Dis refers to the maximum outer diameter of the eye-side surface of the i-th spacer, dis refers to the minimum inner diameter of the eye-side surface of the i-th spacer, Dim refers to the maximum outer diameter of the display-side surface of the i-th spacer, and dim refers to the minimum inner diameter of the display-side surface of the i-th spacer, with i taking values ​​from 1 and 2. EP12 is the distance from the display-side surface of the first spacer to the eye-side surface of the second spacer, d0s is the minimum inner diameter of the eye-side surface of the lens barrel, d0m is the minimum inner diameter of the display-side surface of the lens barrel, D0s is the maximum inner diameter of the eye-side surface of the lens barrel, and D0m is the maximum inner diameter of the display-side surface of the lens barrel.

[0086] The following description, with reference to the accompanying drawings, further illustrates specific surface types and parameters of the VR visual system applicable to the above embodiments.

[0087] It should be noted that the following examples include a first state, a second state, and a third state. Within the same example, the parameters of the VR visual system in the first, second, and third states—such as the radius of curvature, center thickness, inter-lens spacing, and higher-order image coefficients—are the same. However, the parameters of the lens barrel P0, the thickness of the spacers, the inner and outer diameters of the spacers, and the distance between the spacers differ, as do the shapes of some lenses. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0088] It should be noted that any of the examples one through three below are applicable to all embodiments of this application.

[0089] Example 1

[0090] like Figures 2 to 8 As shown, an example of the VR visual system of this application is described. Figure 3 The diagram shows a schematic of the VR visual system in Example 1 in its first state. Figure 4 The diagram shows a schematic of the VR visual system in Example 1 in its second state. Figure 5 The diagram shows the structure of the VR visual system in Example 1 in the third state.

[0091] like Figure 2 As shown, the VR visual system includes, in order from the object side to the image side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, and a third lens E3.

[0092] exist Figure 3 In the VR visual system, the side of the lens barrel closest to the display has a support flange extending towards the optical axis. At least a portion of the display-side surface of the third lens abuts against the support flange, ensuring the stability of the VR visual system assembly. Simultaneously, the first lens E1 in the VR visual system directly abuts against the second optical element, and a second spacer P2 exists between the second lens E2 and the third lens E3.

[0093] exist Figure 4 The second state shown is the same as Figure 3 The difference in the first state shown is that the VR visual system also includes a first spacer P1 and an auxiliary spacer P2b. The first spacer P1 is disposed between the first lens E1 and the second optical element, and the auxiliary spacer P2b is disposed between the second spacer P2 and the third lens E3.

[0094] exist Figure 5 The second state shown is the same as Figure 3 The difference in the first state shown is the position of the supporting flange. Figure 5 The eye-side surface of the middle lens barrel has a support flange extending towards the optical axis, and at least a portion of the eye-side surface of the first lens abuts against the support flange to ensure the stability of the VR visual system assembly.

[0095] In this example, the eye-side surface S1 of the first lens is concave, and the display-side surface S2 of the first lens is convex. The eye-side surface S5 of the second lens is concave, and the display-side surface S6 of the second lens is convex. The eye-side surface S7 of the third lens is concave, and the display-side surface S8 of the third lens is convex.

[0096] Table 1 shows the basic structural parameters of the VR visual system in Example 1. The units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). In Table 1, the arrangement order of the surface numbers is the order in which the light passes through, and refraction / reflection is the refraction or reflection of the light by that surface during this passage.

[0097]

[0098] Table 1

[0099] In Example 1, the eye-side surface and display-side surface of any one of the lenses, from the first lens E1 to the third lens E3, are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0100] Formula (1);

[0101] 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, that is, 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 the aspherical mirrors S1, S2, S5-S8 in Example 1.

[0102]

[0103] Table 2

[0104] Figure 6 The on-axis chromatic aberration curve of the VR visual system in Example 1 is shown, which represents the deflection of the focal point after light of different wavelengths passes through the VR visual system. Figure 7 The astigmatism curves of the VR visual system in Example 1 are shown, representing the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 8 The distortion curve of the VR visual system in Example 1 is shown, which represents the distortion magnitude corresponding to different field of view angles.

[0105] according to Figures 6 to 8 As can be seen, the VR visual system given in Example 1 can achieve good imaging quality.

[0106] Example 2

[0107] like Figures 9 to 15 As shown, the VR visual system of Example 2 of this application is described. Figure 10 The diagram shows a schematic of the VR visual system in Example 2 in its first state. Figure 11 The diagram shows a schematic of the VR visual system in Example 2 in its second state. Figure 12 A schematic diagram of the VR visual system in Example 2 in its third state is shown. For the sake of brevity, descriptions similar to those in Example 1 are omitted.

[0108] like Figure 9 As shown, the VR visual system includes, in order from the object side to the image side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, and a third lens E3.

[0109] exist Figure 10 In the VR visual system, the lens barrel has a support flange extending towards the optical axis on the side closest to the human eye. At least a portion of the eye-side surface of the first lens abuts against the support flange, ensuring the stability of the VR visual system assembly. Simultaneously, the first lens E1 in the VR visual system directly abuts against the second optical element, and a second spacer P2 is located between the second lens E2 and the third lens E3.

[0110] exist Figure 11 The second state shown is the same as Figure 10 The difference in the first state shown is that the VR visual system also includes a first spacer P1 and an auxiliary spacer P2b. The first spacer P1 is disposed between the first lens E1 and the second optical element, and the auxiliary spacer P2b is disposed between the second spacer P2 and the third lens E3.

[0111] exist Figure 12 The second state shown is the same as Figure 10 The difference in the first state shown is that the VR visual system also includes a first spacer P1, which is disposed between the first lens E1 and the second optical element.

[0112] In this example, the eye-side surface S1 of the first lens is concave, and the display-side surface S2 of the first lens is convex. The eye-side surface S5 of the second lens is concave, and the display-side surface S6 of the second lens is convex. The eye-side surface S7 of the third lens is concave, and the display-side surface S8 of the third lens is convex.

[0113] Table 3 shows the basic structural parameters of the VR visual system in Example 2. The units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). In Table 3, the arrangement order of the surface numbers is the order in which the light passes through, and refraction / reflection is the refraction or reflection of the light by that surface during this passage.

[0114]

[0115] Table 3

[0116] Table 4 gives the higher-order coefficients of S1, S2, S5-S8 for each aspherical lens in Example 2. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) in Example 1.

[0117]

[0118] Table 4

[0119] Figure 13 The on-axis chromatic aberration curve of the VR visual system in Example 2 is shown, which indicates the deflection of the focal point after light of different wavelengths passes through the VR visual system. Figure 14 The astigmatism curves of the VR visual system in Example 2 are shown, representing the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 15 The distortion curve of the VR visual system in Example 2 is shown, which represents the distortion magnitude corresponding to different field of view angles.

[0120] according to Figures 13 to 15 As can be seen, the VR visual system given in Example 2 can achieve good imaging quality.

[0121] Example 3

[0122] like Figures 16 to 22 As shown, the VR visual system of Example 3 of this application is described. Figure 17 The diagram shows the structure of the VR visual system in Example 3 in its first state. Figure 18 The diagram shows the structure of the VR visual system in Example 3 in the second state. Figure 19 A schematic diagram of the VR visual system in Example 3 in its third state is shown. For the sake of brevity, descriptions similar to those in Example 1 are omitted.

[0123] like Figure 16 As shown, the VR visual system includes, in order from the object side to the image side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, and a third lens E3.

[0124] exist Figure 17 In the VR visual system, the lens barrel has a support flange extending towards the optical axis on the side closest to the human eye. At least a portion of the eye-side surface of the first lens abuts against the support flange, ensuring the stability of the VR visual system assembly. Simultaneously, the first lens E1 in the VR visual system directly abuts against the second optical element, and a second spacer P2 is located between the second lens E2 and the third lens E3.

[0125] exist Figure 18 The second state shown is the same as Figure 17 The difference in the first state shown is that the VR visual system also includes a first spacer P1. The first spacer P1 is disposed between the first lens E1 and the second optical element.

[0126] exist Figure 19 The second state shown is the same as Figure 17 The difference in the first state shown is that the VR visual system also includes a first spacer P1 and an auxiliary spacer P2b. The first spacer P1 is disposed between the first lens E1 and the second optical element, and the auxiliary spacer P2b is disposed between the second spacer P2 and the third lens E3.

[0127] In this example, the eye-side surface S1 of the first lens is convex, and the display-side surface S2 of the first lens is convex. The eye-side surface S5 of the second lens is concave, and the display-side surface S6 of the second lens is convex. The eye-side surface S7 of the third lens is concave, and the display-side surface S8 of the third lens is convex.

[0128] Table 5 shows the basic structural parameters of the VR visual system in Example 3. The units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). In Table 5, the arrangement order of the surface numbers is the order in which the light passes through, and refraction / reflection is the refraction or reflection of the light by that surface during this passage.

[0129]

[0130] Table 5

[0131] Table 6 gives the higher-order coefficients of S1, S2, S5-S8 for each aspherical lens in Example 3. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) in Example 1.

[0132]

[0133] Table 6

[0134] Figure 20 The on-axis chromatic aberration curve of the VR visual system in Example 3 is shown, which indicates the deflection of the focal point after light of different wavelengths passes through the VR visual system. Figure 21 The astigmatism curves of the VR visual system in Example 3 are shown, representing the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 22 The distortion curve of the VR visual system in Example 3 is shown, which represents the distortion magnitude corresponding to different field of view angles.

[0135] according to Figures 20 to 22 As can be seen, the VR visual system given in Example 3 can achieve good imaging quality.

[0136] In summary, in Examples 1 to 3, the reflective polarizing element RP, the quarter-wave plate QWP, and the second lens are bonded together to form the second optical element. That is, the display-side surface of the reflective polarizing element RP and the eye-side surface of the quarter-wave plate QWP are the same surface, and the display-side surface of the quarter-wave plate QWP and the eye-side surface of the second lens are the same surface.

[0137] In Examples 1 and 2, a partial reflective layer BS is disposed on the display-side surface S6 of the second lens, and in Example 3, a partial reflective layer BS is disposed on the eye-side surface S7 of the third lens.

[0138] The following is combined with Figure 2 and Figure 9The trajectory of the light emitted from light source S9 is explained as follows: The light emitted from light source S9 passes sequentially through the display-side surface S8 of the third lens, the eye-side surface S7 of the third lens, and the display-side surface S6 of the second lens before incident on the display-side surface S5 of the quarter-wave plate. The quarter-wave plate QWP converts the light into a first polarization state. The first polarization state light is incident on the display-side surface S4 of the reflective polarizing element and is reflected to form the first reflected light. The first reflected light is incident on the display-side surface S5 of the quarter-wave plate, and the quarter-wave plate QWP converts the first reflected light into a second polarization state. The second polarization state light is incident on the display-side surface S4 of the second lens. The second polarized light is reflected by the display-side surface S6 of the second lens (partially by the reflective layer BS on the display-side surface of the second lens) to form a second reflected light. The second reflected light is incident on the display-side surface S5 of the quarter-wave plate. The quarter-wave plate QWP converts the second reflected light into a third polarized light. The third polarized light is incident on the display-side surface S4 of the reflective polarizing element and is transmitted by the display-side surface S4 of the reflective polarizing element. The transmitted light passes sequentially through the eye-side surface S3 of the reflective polarizing element, the display-side surface S2 of the first lens, and the eye-side surface S1 of the first lens before exiting at the aperture STO.

[0139] In Example 3, the direction of the light differs from that in Example 1. The light in the second polarization state is incident on the display side surface S6 of the second lens. After being transmitted through the display side surface S6 of the second lens, it is incident on the eye side surface S7 of the third lens. The light in the second polarization state is reflected by the eye side surface S7 of the third lens (partial reflective layer BS disposed on the eye side surface of the third lens) to form a second reflected light. The second reflected light is incident sequentially on the display side surface S6 of the second lens and the display side surface S5 of the quarter-wave plate. The quarter-wave plate QWP converts the second reflected light into a light in the third polarization state.

[0140] It should be noted that during the process of light from the first polarization state becoming light from the third polarization state, it passes through two quarter-wave plates, which makes the polarization direction of the light from the first polarization state perpendicular to the polarization direction of the light from the third polarization state. Therefore, the reflective polarizing element reflects the light from the first polarization state and transmits the light from the third polarization state.

[0141] In summary, Examples 1 to 3 satisfy the relationships shown in Table 7.

[0142]

[0143] Table 7

[0144] Table 8 provides some parameters of the VR visual systems in Examples 1 to 3.

[0145]

[0146] Table 8

[0147] It should be noted that in Tables 7 and 8, 1-1 represents the first state of the VR visual system in Example 1, 1-2 represents the second state of the VR visual system in Example 1, and 1-3 represents the third state of the VR visual system in Example 1. Similarly, 2-1 represents the first state of the VR visual system in Example 2, 2-2 represents the second state of the VR visual system in Example 2, 2-3 represents the third state of the VR visual system in Example 2, 3-1 represents the first state of the VR visual system in Example 3, 3-2 represents the second state of the VR visual system in Example 3, and 3-3 represents the third state of the VR visual system in Example 3.

[0148] Table 9 shows the effective focal lengths of the first lens, second optical element, and third lens of the VR visual systems in Examples 1 to 3.

[0149]

[0150] Table 9

[0151] 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 VR viewing system described above.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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 VR visual system, characterized in that, The VR visual system is capable of receiving light from a light source. The VR visual system has a total of three lenses with optical power. The VR visual system includes: A first optical element, the first optical element including at least a first lens, the first lens having positive optical power, and the display side surface of the first lens being convex; The second optical element has positive optical power and includes at least a second lens with positive optical power. The eye-side surface of the second lens is concave and the display-side surface of the second lens is convex. The third optical element includes at least a third lens, the third lens having negative optical power, the eye-side surface of the third lens being concave, and the display-side surface of the third lens being convex. A second spacer is located between the second optical element and the third optical element; The first optical element to the third optical element are arranged sequentially along the optical axis of the VR visual system, and the third optical element is closer to the light source than the second lens; In this embodiment, all lenses from the first optical element to the third optical element have at least one eye-side surface away from the light source and at least one display-side surface close to the light source, and the display-side surface of the second lens or the eye-side surface of the third lens has a partial reflective layer; The second optical element further includes a reflective polarizing element and a quarter-wave plate. The reflective polarizing element is located on one side of the second lens and has at least one eye-side surface away from the light source and at least one display-side surface close to the light source. The quarter-wave plate has at least one eye-side surface away from the light source and at least one display-side surface close to the light source. The display-side surface of the reflective polarizing element is at least in partial contact with the eye-side surface of the quarter-wave plate. The radius of curvature R4 of the display side surface of the second lens, the radius of curvature R5 of the eye side surface of the third lens, the maximum outer diameter D2m of the display side surface of the second spacer and the minimum inner diameter d2s of the eye side surface of the second spacer satisfy the following: -74.03≤(R4+R5) / (D2m-d2s)≤-23.

23.

2. The VR visual system according to claim 1, characterized in that, The VR visual system also includes an auxiliary spacer, which rests against the display-side surface portion of the second spacer.

3. The VR visual system according to any one of claims 1 to 2, characterized in that, The VR visual system further includes a lens barrel, in which the first optical element to the third optical element are housed. The effective focal length f of the VR visual system, the minimum inner diameter d0s of the eye-side surface of the lens barrel, and the minimum inner diameter d0m of the display-side surface of the lens barrel satisfy the following: -1.47≤f / (d0s-d0m)≤1.73, where f / (d0s-d0m) is not equal to 0.

4. The VR visual system according to any one of claims 1 to 2, characterized in that, The VR visual system further includes a lens barrel, in which the first optical element to the third optical element are housed. The effective focal length f of the VR visual system, the maximum inner diameter D0s of the eye-side surface of the lens barrel, and the maximum inner diameter D0m of the display-side surface of the lens barrel satisfy the following condition: -7.90≤f / (D0m-D0s)≤5.69, where f / (D0m-D0s) is not equal to 0.

5. The VR visual system according to any one of claims 1 to 2, characterized in that, The VR visual system further includes a lens barrel, in which the first optical element to the third optical element are housed. The distance TD between the eye-side surface of the first optical element and the display-side surface of the third optical element on the optical axis, the maximum outer diameter D0s of the eye-side surface of the lens barrel, and the minimum inner diameter d0s of the eye-side surface of the lens barrel satisfy the following: 0.86≤TD / (D0s-d0s)≤8.

71.

6. A VR visual system, characterized in that, The VR visual system is capable of receiving light from a light source. The VR visual system has a total of three lenses with optical power. The VR visual system includes: A first optical element, the first optical element including at least a first lens, the first lens having positive optical power, and the display side surface of the first lens being convex; The second optical element has positive optical power and includes at least a second lens with positive optical power. The eye-side surface of the second lens is concave and the display-side surface of the second lens is convex. The third optical element includes at least a third lens, the third lens having negative optical power, the eye-side surface of the third lens being concave, and the display-side surface of the third lens being convex. A second spacer is located between the second optical element and the third optical element; The first optical element to the third optical element are arranged sequentially along the optical axis of the VR visual system, and the third optical element is closer to the light source than the second lens; In this embodiment, all lenses from the first optical element to the third optical element have at least one eye-side surface away from the light source and at least one display-side surface close to the light source, and the display-side surface of the second lens or the eye-side surface of the third lens has a partial reflective layer; The second optical element further includes a reflective polarizing element and a quarter-wave plate. The reflective polarizing element is located on one side of the second lens and has at least one eye-side surface away from the light source and at least one display-side surface close to the light source. The quarter-wave plate has at least one eye-side surface away from the light source and at least one display-side surface close to the light source. The display-side surface of the reflective polarizing element is at least in partial contact with the eye-side surface of the quarter-wave plate. The minimum inner diameter d2s of the eye-side surface of the second spacer, the minimum inner diameter d2m of the display-side surface of the second spacer, the radius of curvature R4 of the display-side surface of the second lens, and the radius of curvature R5 of the eye-side surface of the third lens satisfy the following: 2.32≤(d2s / R4)×(d2m / R5)≤2.95; The radius of curvature R4 of the display side surface of the second lens, the radius of curvature R5 of the eye side surface of the third lens, the maximum outer diameter D2m of the display side surface of the second spacer and the minimum inner diameter d2s of the eye side surface of the second spacer satisfy the following: -74.03≤(R4+R5) / (D2m-d2s)≤-23.

23.

7. An imaging device, characterized in that, Includes the VR visual system described in any one of claims 1 to 6.

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