VR Visual System

Abstract

The present invention provides a VR visual system, comprising: a first optical element including a first lens; a second optical element including a second lens; a third optical element including a third lens, wherein a partial reflection layer is provided among the first lens to the third lens; a first spacer element partially abuts against the display side surface of the second lens; a lens barrel; a clearance distance ET23 from the maximum effective diameter edge of the display side surface of the second lens to the maximum effective diameter edge of the ocular side surface of the third lens satisfies: 0.5 mm < ET23 < 0.7 mm; an axial distance EP01 from the ocular side surface of the lens barrel to the ocular side surface of the first spacer element and an effective focal length f of the VR visual system satisfy: 0 < EP01 / f < 0.8; an inner diameter d1m of the display side surface of the first spacer element, an effective focal length f of the VR visual system, and a half of the maximum field of view Semi-FOV of the VR visual system satisfy: 0.5 < (d1m / 2) / (f*tan(Semi-FOV)) < 1. The present invention solves the problem in the prior art that it is difficult to balance high image quality, large field of view and miniaturization of the VR visual system.

Description

Technical Field

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

[0002] VR (Virtual Reality) visual systems are application systems that combine virtual reality and visual technologies to provide users with an immersive virtual experience. VR visual systems have a wide range of applications, including gaming, education, healthcare, and architectural design. Through VR visual systems, users can experience virtual environments as if they were actually there, gaining a more immersive and interactive experience. However, as VR devices become increasingly miniaturized, existing three-piece VR visual systems face significant challenges in reducing their size to maintain image quality, making them unsuitable for smaller VR devices. Furthermore, miniaturization affects the system's optical path; changes in the direction of light refraction make it difficult to guarantee the field of view, thus impacting the user's visual experience and immersion. Therefore, controlling the optical parameters and the inner diameter of the spacer elements in a VR visual system to achieve high image quality and a wide field of view while simultaneously miniaturizing the device is a pressing issue that needs to be addressed. Summary of the Invention

[0003] The main objective of this invention is to provide a VR visual system that solves the problem that it is difficult to achieve high image quality, a large field of view, and miniaturization in existing VR visual systems.

[0004] To achieve the above object, according to one aspect of the present invention, a VR visual system is provided, which sequentially includes from the viewing side to the display side: a first optical element, the first optical element at least includes a first lens; a second optical element, the second optical element at least includes a second lens; a third optical element, the third optical element at least includes a third lens. The Abbe numbers of the first lens, the second lens and the third lens are all greater than 60. The first lens, the second lens and the third lens each have a viewing-side surface away from the light source and a display-side surface close to the light source. At least one of the viewing-side surfaces or the display-side surfaces of the first lens, the second lens and the third lens has a partial reflection layer; the VR visual system further includes a plurality of spacer elements, the plurality of spacer elements at least includes a first spacer element, and the first spacer element is adjacent to the display-side surface of the second lens and at least partially abuts; the VR visual system further includes a barrel, and the first optical element to the third optical element and the plurality of spacer elements are all accommodated in the barrel; wherein, the clearance distance ET23 from the edge of the maximum effective diameter of the display-side surface of the second lens to the edge of the maximum effective diameter of the viewing-side surface of the third lens satisfies: 0.5mm < ET23 < 0.7mm; the axial distance EP01 from the viewing-side surface of the barrel to the viewing-side surface of the first spacer element and the effective focal length f of the VR visual system satisfy: 0 < EP01 / f < 0.8; the inner diameter d1m of the display-side surface of the first spacer element, the effective focal length f of the VR visual system, and half of the maximum viewing angle Semi-FOV of the VR visual system satisfy: 0.5 < (d1m / 2) / (f * tan(Semi-FOV)) < 1.

[0005] According to another aspect of the present invention, a VR visual system is provided, which sequentially includes, from the viewing side to the display side: a first optical element, the first optical element at least includes a first lens; a second optical element, the second optical element at least includes a second lens; a third optical element, the third optical element at least includes a third lens. The Abbe numbers of the first lens, the second lens, and the third lens are all greater than 60. The first lens, the second lens, and the third lens each have a viewing-side surface away from the light source and a display-side surface close to the light source, and at least one of the viewing-side surfaces or display-side surfaces of the first lens, the second lens, and the third lens has a partial reflection layer; the VR visual system further includes a plurality of spacer elements, the plurality of spacer elements at least includes a first spacer element, and the first spacer element is adjacent to the display-side surface of the second lens and at least partially abuts; the VR visual system further includes a barrel, and the first optical element to the third optical element and the plurality of spacer elements are all accommodated in the barrel; wherein, the inner diameter d1m of the display-side surface of the first spacer element, the effective focal length f of the VR visual system, and half of the maximum viewing angle Semi-FOV of the VR visual system satisfy: 0.5 < (d1m / 2) / (f * tan(Semi-FOV)) < 1; the effective focal length f of the VR visual system, the outer diameter D1s of the viewing-side surface of the first spacer element, and the inner diameter d1s of the viewing-side surface of the first spacer element satisfy: 1 < f / (D1s - d1s) < 5. The present application provides a VR visual system with three optical elements. By controlling the effective focal length, viewing angle, inner and outer diameters of the spacer element, and Abbe number of the lens of the VR visual system, the internal light beam path and light flux of the VR visual system are restricted, the refraction of the edge light path is controlled, the viewing angle of the VR visual system meets the use requirements, the user's use immersion is ensured, and at the same time, the thickness of the three lenses in the optical axis direction is controlled at a reasonable level, so that the height of the VR visual system is at a reasonable level, which is beneficial to miniaturization.

[0006] According to another aspect of the present invention, a VR visual system is provided, which sequentially includes, from the viewing side to the display side: a first optical element, the first optical element at least includes a first lens; a second optical element, the second optical element at least includes a second lens; a third optical element, the third optical element at least includes a third lens, the Abbe numbers of the first lens, the second lens and the third lens are all greater than 60, the first lens, the second lens and the third lens each have a viewing side surface away from the light source and a display side surface close to the light source, and at least one of the viewing side surfaces or the display side surfaces of the first lens, the second lens and the third lens has a partial reflection layer; the VR visual system further includes a plurality of spacer elements, the plurality of spacer elements at least includes a first spacer element, the first spacer element is adjacent to the display side surface of the second lens and at least partially abuts; the VR visual system further includes a barrel, the first optical element to the third optical element and the plurality of spacer elements are all accommodated in the barrel; wherein, the inner diameter d1m of the display side surface of the first spacer element, the effective focal length f of the VR visual system, and half of the maximum field angle Semi-FOV of the VR visual system satisfy: 0.5 < (d1m / 2) / (f * tan(Semi-FOV)) < 1; the inner diameter d0m of the display side surface of the barrel, the axial distance TD from the viewing side surface of the first lens to the display side surface of the third lens, the inner diameter d1m of the display side surface of the first spacer element, and the central thickness CT3 of the third lens satisfy: 5 < d0m / TD + d1m / CT3 < 7. The present application provides a VR visual system with three optical elements. By controlling the effective focal length, field angle, inner diameter of the spacer element, Abbe number of the lens, and the length of the optical element, and the central thickness of the third lens of the VR visual system, the internal light beam path and the light beam diameter of the VR visual system are restricted, so that the aperture of the system is at a reasonable level. At the same time, the refraction of the edge light path is controlled, so that the field angle of the VR visual system meets the use requirements, ensuring the user's immersion experience. At the same time, the thickness of the three lenses in the optical axis direction is controlled at a reasonable level, so that the height of the VR visual system is at a reasonable level, which is beneficial to miniaturization.

[0007] Further, the third optical element further includes a reflective polarizing element and a quarter-wave plate. The display side surface of the quarter-wave plate is at least partially in contact with the viewing side surface of the third lens, and the viewing side surface of the quarter-wave plate is at least partially in contact with the display side surface of the reflective polarizing element.

[0008] Further, the display side surface of the third lens has a partial reflection layer, and the viewing side surface of the third lens is a plane.

[0009] Further, the on-axis distance TD from the ocular-side surface of the first lens to the display-side surface of the third lens, the on-axis distance EP01 from the ocular-side surface of the barrel to the ocular-side surface of the first spacer, and the maximum length L from the ocular-side surface of the barrel to the display-side surface of the barrel satisfy: 2 < TD / EP01 + TD / L < 4$.

[0010] Further, the effective focal length f of the VR visual system, the outer diameter D1s of the ocular-side surface of the first spacer element, and the inner diameter d1s of the ocular-side surface of the first spacer element satisfy: 1 < f / (D1s - d1s) < 5$.

[0011] Further, the on-axis distance EP01 from the ocular-side surface of the barrel to the ocular-side surface of the first spacer, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy: 1 < EP01 / (CT1 + CT2) < 2$.

[0012] Further, the outer diameter D0s of the ocular-side surface of the barrel, the inner diameter d0s of the ocular-side surface of the barrel, the maximum length L from the ocular-side surface of the barrel to the display-side surface of the barrel, and the effective focal length f of the VR visual system satisfy: -10 < (D0s - d0s) / (L - f) < 5$.

[0013] Further, the entrance pupil diameter EPD of the VR visual system, the on-axis distance T23 from the display-side surface of the second lens to the ocular-side surface of the third lens, and the center thickness CP1 of the first spacer element satisfy: 5 < EPD / (T23 - CP1) < 15$.

[0014] Further, the outer diameter D0m of the display-side surface of the barrel, the outer diameter D0s of the ocular-side surface of the barrel, the entrance pupil diameter EPD of the VR visual system, and the effective focal length f of the VR visual system satisfy: 12 < D0m / f + D0s / EPD < 18$.

[0015] Further, the inner diameter d0m of the display-side surface of the barrel, the on-axis distance TD from the ocular-side surface of the first lens to the display-side surface of the third lens, the inner diameter d1m of the display-side surface of the first spacer element, and the center thickness CT3 of the third lens satisfy: 5 < d0m / TD + d1m / CT3 < 7$.

[0016] Further, when the center thickness CT1 of the first lens and the center thickness CT2 of the second lens satisfy: 3 < CT1 / CT2 < 4, the plurality of spacer elements further includes a first auxiliary spacer element, and the first auxiliary spacer element at least partially abuts against the display-side surface of the first lens$.

[0017] Further, the following conditions are satisfied among the effective focal length f2 of the second lens, the effective focal length f1 of the first lens, the maximum length L from the ocular-side surface of the lens barrel to the display-side surface of the lens barrel, and the central thickness CP1b of the first auxiliary spacer element: 1 < f2 / f1 - L / CP1b < 3.

[0018] Further, the following conditions are satisfied among the central thickness CP1 of the first spacer element, the central thickness CP1b of the first auxiliary spacer element, the effective focal length f1 of the first lens, and the effective focal length f3 of the third lens: 0.2 < (CP1 + CP1b) / (f1 + f3) < 0.3.

[0019] Further, the following conditions are satisfied among the radius of curvature R3 of the ocular-side surface of the second lens, the outer diameter D1bm of the display-side surface of the first auxiliary spacer element, the radius of curvature R2 of the display-side surface of the first lens, and the outer diameter D1bs of the ocular-side surface of the first auxiliary spacer element: 14 < R3 / D1bm - R2 / D1bs < 16.

[0020] Applying the technical solution of the present invention, the VR visual system sequentially includes a first optical element, a second optical element, and a third optical element from the ocular side to the display side. The VR visual system further includes a plurality of spacer elements and a lens barrel. The first optical element at least includes a first lens; the second optical element at least includes a second lens; the third optical element at least includes a third lens. The Abbe numbers of the first lens, the second lens, and the third lens are all greater than 60. The first lens, the second lens, and the third lens each have an ocular-side surface away from the light source and a display-side surface close to the light source. At least one of the ocular-side surface or the display-side surface of the first lens, the second lens, and the third lens has a partial reflection layer; the plurality of spacer elements at least includes a first spacer element, and the first spacer element is adjacent to the display-side surface of the second lens and at least partially abuts; the first optical element to the third optical element and the plurality of spacer elements are all accommodated in the lens barrel; wherein, the clearance distance ET23 from the maximum effective diameter edge of the display-side surface of the second lens to the maximum effective diameter edge of the ocular-side surface of the third lens satisfies: 0.5 mm < ET23 < 0.7 mm; the axial distance EP01 from the ocular-side surface of the lens barrel to the ocular-side surface of the first spacer element and the effective focal length f of the VR visual system satisfy: 0 < EP01 / f < 0.8; the inner diameter d1m of the display-side surface of the first spacer element, the effective focal length f of the VR visual system, and half of the maximum field angle Semi-FOV of the VR visual system satisfy: 0.5 < (d1m / 2) / (f * tan(Semi-FOV)) < 1.

[0021] This application provides a VR visual system with three optical elements. By controlling the effective focal length, field of view, inner diameter of the spacer element and its distance from the lens barrel, Abbe number of the lens, and distance between the effective diameter edges of the lens, the internal beam path of the VR visual system is constrained, the refraction of the edge light path is controlled, the generation of stray light is reduced, and the imaging quality is improved. This ensures that the field of view of the VR visual system meets the usage requirements and guarantees the user's immersive experience. At the same time, the thickness of the three lenses in the optical axis direction is controlled at a reasonable level, thereby keeping the height of the VR visual system at a reasonable level, which is beneficial for miniaturization. Attached Figure Description

[0022] 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:

[0023] Figure 1 A schematic diagram of the structure of a VR viewing system according to an optional embodiment of the present invention is shown;

[0024] Figure 2 A schematic diagram of the VR visual system according to Embodiment 1 of the present invention is shown;

[0025] Figures 3 to 5 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Embodiment 1 of the present invention are shown respectively;

[0026] Figure 6 A schematic diagram of the VR visual system according to Embodiment 2 of the present invention is shown;

[0027] Figure 7 A schematic diagram of the VR visual system according to Embodiment 3 of the present invention is shown;

[0028] Figure 8 A schematic diagram of the VR visual system according to Embodiment 4 of the present invention is shown;

[0029] Figures 9 to 11 The on-axis chromatic aberration curve, astigmatism curve, and distortion chromatic aberration curve of Embodiment 4 of the present invention are shown respectively.

[0030] Figure 12 A schematic diagram of the VR visual system according to Embodiment 5 of the present invention is shown;

[0031] Figure 13 A schematic diagram of the VR visual system according to Embodiment Six of the present invention is shown;

[0032] Figure 14 A schematic diagram of the VR visual system according to Embodiment 7 of the present invention is shown;

[0033] Figures 15 to 17The on-axis chromatic aberration curve, astigmatism curve, and distortion chromatic aberration curve of Embodiment 7 of the present invention are shown respectively;

[0034] Figure 18 A schematic diagram of the VR visual system according to Embodiment 8 of the present invention is shown;

[0035] Figure 19 A schematic diagram of the VR visual system according to Embodiment 9 of the present invention is shown.

[0036] The above figures include the following reference numerals:

[0037] P0, Lens barrel; E1, First lens; S1, Eye-side surface of the first lens; S2, Display-side surface of the first lens; P1b, First auxiliary spacer element; E2, Second lens; S3, Eye-side surface of the second lens; S4, Display-side surface of the second lens; ERP, Reflective polarizing element; S5, Eye-side surface of the reflective polarizing element; S6, Display-side surface of the reflective polarizing element (eye-side surface of the quarter-wave plate); EQWP, Quarter-wave plate; S7, Display-side surface of the quarter-wave plate (eye-side surface of the third lens); P1, First spacer element; E3, Third lens; S8, Display-side surface of the third lens. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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 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 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.

[0044] To address the challenge of simultaneously achieving high image quality, a wide field of view, and miniaturization in existing VR visual systems, this invention provides a VR visual system.

[0045] First Implementation Method

[0046] like Figures 1 to 19As shown, the VR visual system sequentially includes a first optical element, a second optical element, and a third optical element from the viewing side to the display side. The VR visual system further includes a plurality of spacer elements and a lens barrel. The first optical element at least includes a first lens; the second optical element at least includes a second lens; the third optical element at least includes a third lens. The Abbe numbers of the first lens, the second lens, and the third lens are all greater than 60. The first lens, the second lens, and the third lens each have an eye side surface away from the light source and a display side surface close to the light source. At least one of the eye side surfaces or the display side surfaces of the first lens, the second lens, and the third lens has a partial reflection layer; the plurality of spacer elements at least includes a first spacer element, and the first spacer element is adjacent to the display side surface of the second lens and at least partially abuts; the first optical element to the third optical element and the plurality of spacer elements are all accommodated in the lens barrel; wherein, the gap distance ET2 between the maximum effective diameter edge of the display side surface of the second lens and the maximum effective diameter edge of the eye side surface of the third lens satisfies: 0.5mm < ET23 < 0.7mm; the axial distance EP01 between the eye side surface of the lens barrel and the eye side surface of the first spacer element and the effective focal length f of the VR visual system satisfy: 0 < EP01 / f < 0.8; the inner diameter d1m of the display side surface of the first spacer element, the effective focal length f of the VR visual system, and half of the maximum viewing angle Semi-FOV of the VR visual system satisfy: 0.5 < (d1m / 2) / (f * tan(Semi-FOV)) < 1.

[0047] This application provides a VR visual system with three optical elements. By controlling the effective focal length, viewing angle, inner diameter of the spacer element, the distance from the lens barrel, the Abbe number of the lens, and the distance between the effective diameter edges of the lens, the internal light beam path of the VR visual system is restricted, the refraction of the edge light path is controlled, the generation of stray light is reduced, the imaging quality is improved, the viewing angle of the VR visual system meets the usage requirements, ensuring the user's immersion experience. At the same time, the thickness of the three lenses in the optical axis direction is controlled at a reasonable level, so that the height of the VR visual system is at a reasonable level, which is beneficial to miniaturization.

[0048] This application also improves the assembly stability of the second lens by at least partially abutting the first spacer element against the second lens. Further, by controlling the inner diameter of the display side surface of the first spacer element, its processing feasibility is ensured.

[0049] Preferably, the gap distance ET23 between the maximum effective diameter edge of the display side surface of the second lens and the maximum effective diameter edge of the eye side surface of the third lens satisfies: 0.51mm < ET23 < 0.68mm.

[0050] Preferably, the axial distance EP01 from the ocular side surface of the lens barrel to the ocular side surface of the first spacer element and the effective focal length f of the VR visual system satisfy: 0.2 < EP01 / f < 0.7.

[0051] Preferably, the inner diameter d1m of the display side surface of the first spacer element, the effective focal length f of the VR visual system, and half of the maximum viewing angle Semi-FOV of the VR visual system satisfy: 0.6 < (d1m / 2) / (f * tan(Semi-FOV)) < 0.9.

[0052] In this embodiment, the third optical element further includes a reflective polarizing element and a quarter-wave plate. The display side surface of the quarter-wave plate is at least partially in contact with the ocular side surface of the third lens, and the ocular side surface of the quarter-wave plate is at least partially in contact with the display side surface of the reflective polarizing element. Through the reflective polarizing element and the quarter-wave plate included in the third optical element, in cooperation with the partial reflection layer on the third lens, the folding back of the optical path is achieved. When obtaining the same FOV, the height of the VR visual system is reduced, which is beneficial to the miniaturization of the VR device and increases the possibility of long-term user wearing. At the same time, by at least partially contacting the display side surface of the reflective polarizing element with the ocular side surface of the quarter-wave plate, one-time film sticking is achieved, reducing the number of film sticking processes and improving production efficiency. At the same time, one-time planar film sticking reduces the difficulty of film sticking and improves the feasibility of process processing.

[0053] In this embodiment, a partial reflection layer is provided on the display side surface of the third lens, and the ocular side surface of the third lens is a plane. The partial reflection layer is plated on the display side surface of the third lens, enabling the light rays first reflected by the reflective polarizing element to be secondarily reflected, thus achieving the folding back of the optical path. When obtaining the same viewing angle, the distance of the optical path along the optical axis direction is shortened. At the same time, since the ocular side surface of the third lens is a plane, it provides a support for the quarter-wave plate. By planar film sticking, the process difficulty is reduced and the production yield is improved.

[0054] In this embodiment, the axial distance TD from the ocular side surface of the first lens to the display side surface of the third lens, the axial distance EP01 from the ocular side surface of the lens barrel to the ocular side surface of the first spacer, and the maximum length L from the ocular side surface of the lens barrel to the display side surface of the lens barrel satisfy: 2 < TD / EP01 + TD / L < 4. By limiting TD / EP01 + TD / L within a reasonable range, it is beneficial to the molding of the lens barrel and also beneficial to controlling the height of the VR visual system, keeping the height of the VR visual system at a reasonable level and being beneficial to the miniaturization of the VR visual system. Preferably, 2.5 < TD / EP01 + TD / L < 3.5.

[0055] In this embodiment, the effective focal length f of the VR visual system, the outer diameter D1s of the ocular-side surface of the first spacer element, and the inner diameter d1s of the ocular-side surface of the first spacer element satisfy: 1 < f / (D1s - d1s) < 5. By restricting f / (D1s - d1s) within a reasonable range, the effective focal length of the VR visual system is controlled, the aberration of the system is at a reasonable level, which is beneficial to the imaging of the system. At the same time, by controlling the outer diameter and inner diameter of the ocular-side surface of the first spacer element, on the basis of ensuring its machinability, the light flux of the VR visual system is controlled, and the field angle of the VR visual system is at a reasonable level. Preferably, 1.5 < f / (D1s - d1s) < 4.5.

[0056] In this embodiment, the on-axis distance EP01 from the ocular-side surface of the lens barrel to the ocular-side surface of the first spacer, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens satisfy: 1 < EP01 / (CT1 + CT2) < 2. By restricting EP01 / (CT1 + CT2) within a reasonable range, the on-axis distance from the ocular-side surface of the lens barrel to the ocular-side surface of the first spacer is controlled, and the front-segment wall thickness of the lens barrel is at a reasonable level, which not only ensures its processing feasibility but also provides sufficient strength support for the stacking and assembly of the first lens, the second lens, the third lens, the quarter-wave plate, and the reflective polarizing element. Preferably, 1.2 < EP01 / (CT1 + CT2) < 1.8.

[0057] In this embodiment, the outer diameter D0s of the ocular-side surface of the lens barrel, the inner diameter d0s of the ocular-side surface of the lens barrel, the maximum length L from the ocular-side surface of the lens barrel to the display-side surface of the lens barrel, and the effective focal length f of the VR visual system satisfy: -10 < (D0s - d0s) / (L - f) < 5. By restricting (D0s - d0s) / (L - f) within a reasonable range, the optical power of the VR visual system is controlled, which is beneficial to improving the imaging quality. Combining the control of the maximum length from the ocular-side surface of the lens barrel to the display-side surface of the lens barrel and the inner and outer diameters of the ocular-side surface of the lens barrel is beneficial to constraining the light beam, obtaining a large field of view FOV, and is beneficial to improving the user experience. Preferably, -9.5 < (D0s - d0s) / (L - f) < 4.5.

[0058] In this embodiment, the entrance pupil diameter EPD of the VR visual system, the axial distance T23 from the display-side surface of the second lens to the ocular-side surface of the third lens, and the central thickness CP1 of the first spacer element satisfy: 5 < EPD / (T23 - CP1) < 15. By restricting EPD / (T23 - CP1) within a reasonable range, the entrance pupil diameter of the VR visual system is controlled to meet ergonomics, which is beneficial to the immersive experience of the VR device. At the same time, by controlling the axial distance from the display-side surface of the second lens to the ocular-side surface of the third lens, the central thickness of the second lens is at a reasonable level, and thus the diopter of the second lens meets the design requirements. At the same time, by controlling the central thickness of the first spacer element, the abutting requirements of the first lens and the second lens are met while ensuring its processability. Preferably, 5.5 < EPD / (T23 - CP1) < 13.0.

[0059] In this embodiment, the outer diameter D0m of the display-side surface of the lens barrel, the outer diameter D0s of the ocular-side surface of the lens barrel, the entrance pupil diameter EPD of the VR visual system, and the effective focal length f of the VR visual system satisfy: 12 < D0m / f + D0s / EPD < 18. By restricting D0m / f + D0s / EPD within a reasonable range, the effective focal length of the VR visual system is controlled, and the height of the VR visual system is at a reasonable level. At the same time, by controlling the entrance pupil diameter of the VR visual system to meet ergonomics, it is beneficial to the immersive experience of the VR device; at the same time, by controlling the outer diameters of the ocular-side surface and the display-side surface of the lens barrel, the light incident amount can be effectively controlled, and the light can be utilized more efficiently to participate in imaging, the reflection route of the redundant light can be better changed, the generation of stray light can be reduced, and the imaging clarity can be improved. Preferably, 12.5 < D0m / f + D0s / EPD < 17.5.

[0060] In this embodiment, the inner diameter d0m of the display-side surface of the lens barrel, the axial distance TD from the ocular-side surface of the first lens to the display-side surface of the third lens, the inner diameter d1m of the display-side surface of the first spacer element, and the central thickness CT3 of the third lens satisfy: 5 < d0m / TD + d1m / CT3 < 7. By restricting d0m / TD + d1m / CT3 within a reasonable range, the central thickness of the third lens is controlled, and the optical power of the third lens is at a reasonable level. Further, by combining with controlling the axial distance from the ocular-side surface of the first lens to the display-side surface of the third lens, the height of the VR visual system is at a reasonable level, which is beneficial to miniaturization of the module. At the same time, by controlling the inner diameter of the display-side surface of the lens barrel and the inner diameter of the display-side surface of the first spacer element, the beam diameter of the system is restricted, and the aperture of the system is at a reasonable level. Preferably, 5.5 < d0m / TD + d1m / CT3 < 6.9.

[0061] In this embodiment, when the center thickness CT1 of the first lens and the center thickness CT2 of the second lens satisfy 3 < CT1 / CT2 < 4, the plurality of spacer elements further includes a first auxiliary spacer element, and the first auxiliary spacer element at least partially abuts against the display side surface of the first lens. By restricting CT1 / CT2 within a reasonable range, it helps to adjust the positional relationship among the first lens, the second lens, and the first auxiliary spacer element. The first auxiliary spacer element facilitates the assembly of the first lens and the second lens and contributes to the stability of the assembly. Preferably, 3.2 < CT1 / CT2 < 3.5.

[0062] In this embodiment, the effective focal length f2 of the second lens, the effective focal length f1 of the first lens, the maximum length L from the ocular side surface of the lens barrel to the display side surface of the lens barrel, and the center thickness CP1b of the first auxiliary spacer element satisfy 1 < f2 / f1 - L / CP1b < 3. By restricting f2 / f1 - L / CP1b within a reasonable range, the effective focal lengths of the first lens and the second lens are controlled, and the aberrations of the first lens and the second lens are at a reasonable level, which is beneficial to system imaging. At the same time, controlling the maximum length from the ocular side surface to the display side surface of the lens barrel is beneficial to the molding of the lens barrel and also beneficial to the miniaturization of the VR visual system. Preferably, 1.5 < f2 / f1 - L / CP1b < 2.5.

[0063] In this embodiment, the center thickness CP1 of the first spacer element, the center thickness CP1b of the first auxiliary spacer element, the effective focal length f1 of the first lens, and the effective focal length f3 of the third lens satisfy 0.2 < (CP1 + CP1b) / (f1 + f3) < 0.3. By restricting (CP1 + CP1b) / (f1 + f3) within a reasonable range, the effective focal lengths of the first lens and the third lens are controlled, and the aberrations of the first lens and the third lens are at a reasonable level, which is beneficial to system imaging. At the same time, controlling the center thickness of the first auxiliary spacer element is beneficial to the molding of the first auxiliary spacer element and also beneficial to the assembly and abutment of the second lens and the third optical element. Further, the first spacer element can provide buffering for the third optical element during assembly, which is beneficial to the assembly stability. Preferably, 0.21 < (CP1 + CP1b) / (f1 + f3) < 0.28.

[0064] In this embodiment, the following relationships are satisfied among the radius of curvature R3 of the ocular-side surface of the second lens, the outer diameter D1bm of the display-side surface of the first auxiliary spacer element, the radius of curvature R2 of the display-side surface of the first lens, and the outer diameter D1bs of the ocular-side surface of the first auxiliary spacer element: 14 < R3 / D1bm - R2 / D1bs < 16. By restricting R3 / D1bm - R2 / D1bs within a reasonable range, the outer diameters of the ocular-side surface and the display-side surface of the first auxiliary spacer element are controlled. On the basis of ensuring its machinability, it is beneficial to control the aperture of the front end of the VR visual system and facilitate the assembly of the module. At the same time, restricting the radius of curvature of the display-side surface of the first lens and the radius of curvature of the ocular-side surface of the second lens is beneficial to reducing the sensitivity of the first lens and the second lens and improving the yield of assembly. Preferably, 14.5 < R3 / D1bm - R2 / D1bs < 15.5.

[0065] Second Embodiment

[0066] As Figures 1 to 19 shown, the VR visual system sequentially includes a first optical element, a second optical element, and a third optical element from the ocular side to the display side. The VR visual system further includes a plurality of spacer elements and a barrel. The first optical element at least includes a first lens; the second optical element at least includes a second lens; the third optical element at least includes a third lens. The Abbe numbers of the first lens, the second lens, and the third lens are all greater than 60. The first lens, the second lens, and the third lens each have an ocular-side surface away from the light source and a display-side surface close to the light source. A partial reflection layer is provided on at least one of the ocular-side surface or the display-side surface of the first lens, the second lens, and the third lens; the plurality of spacer elements at least includes a first spacer element, and the first spacer element is adjacent to the display-side surface of the second lens and at least partially abuts; the first optical element to the third optical element and the plurality of spacer elements are all accommodated in the barrel; wherein, the following relationships are satisfied among the inner diameter d1m of the display-side surface of the first spacer element, the effective focal length f of the VR visual system, and half of the maximum viewing angle Semi-FOV of the VR visual system: 0.5 < (d1m / 2) / (f * tan(Semi-FOV)) < 1; the following relationships are satisfied among the effective focal length f of the VR visual system, the outer diameter D1s of the ocular-side surface of the first spacer element, and the inner diameter d1s of the ocular-side surface of the first spacer element: 1 < f / (D1s - d1s) < 5.

[0067] This application provides a VR visual system with three optical elements. By controlling the effective focal length, field of view, inner and outer diameters of the spacer element, and Abbe number of the lens, the internal beam path and light flux of the VR visual system are constrained, the refraction of the edge light path is controlled, the generation of stray light is reduced, and the imaging quality is improved. The field of view of the VR visual system meets the usage requirements and ensures the user's immersive experience. At the same time, the thickness of the three lenses in the optical axis direction is controlled at a reasonable level, thereby keeping the height of the VR visual system at a reasonable level, which is conducive to miniaturization.

[0068] This application also utilizes three lenses to ensure the effective focal length of the VR visual system meets requirements, keeping the system's aberrations at a reasonable level and facilitating image formation. Simultaneously, by having the first spacer element at least partially abut against the second lens, the assembly stability of the second lens is improved. Furthermore, by controlling the outer and inner diameters of the eye-side surface of the first spacer element, its fabrication feasibility is ensured.

[0069] Preferably, the inner diameter d1m of the display side surface of the first spacer element, the effective focal length f of the VR visual system, and half of the maximum field of view (Semi-FOV) of the VR visual system satisfy the following: 0.6 < (d1m / 2) / (f * tan(Semi-FOV)) < 0.9.

[0070] Preferably, the effective focal length f of the VR visual system, the outer diameter D1s of the eye-side surface of the first spacer element, and the inner diameter d1s of the eye-side surface of the first spacer element satisfy the following relationship: 1.5 <f / (D1s-d1s)<4.5。

[0071] This embodiment may also include other parametric expressions from the first embodiment, which will not be elaborated here.

[0072] Third Implementation Method

[0073] like Figures 1 to 19As shown, the VR visual system includes a first optical element, a second optical element, and a third optical element sequentially from the eye side to the display side. The VR visual system also includes multiple spacer elements and a lens barrel. The first optical element includes at least a first lens; the second optical element includes at least a second lens; and the third optical element includes at least a third lens. The Abbe number of the first, second, and third lenses is greater than 60. Each of the first, second, and third lenses has an eye-side surface away from the light source and a display-side surface close to the light source. At least one of the first, second, and third lenses has a partially reflective layer on either the eye-side or display-side surface. The multiple spacer elements include at least a first spacer element, and the third... A spacer element is adjacent to and at least partially abuts against the display-side surface of the second lens; the first to third optical elements and multiple spacer elements are all housed within the lens barrel; wherein, the inner diameter d1m of the display-side surface of the first spacer element, the effective focal length f of the VR visual system, and half of the maximum field of view (Semi-FOV) of the VR visual system satisfy: 0.5 < (d1m / 2) / (f*tan(Semi-FOV)) < 1; the inner diameter d0m of the display-side surface of the lens barrel, the axial distance TD from the eye-side surface of the first lens to the display-side surface of the third lens, the inner diameter d1m of the display-side surface of the first spacer element, and the center thickness CT3 of the third lens satisfy: 5 <d0m / TD+d1m / CT3<7。

[0074] This application provides a VR visual system with three optical elements. By controlling the effective focal length, field of view, inner diameter of the spacer element, Abbe number of the lens, length of the optical elements, and center thickness of the third lens, the internal beam path and beam diameter of the VR visual system are constrained, ensuring the system's aperture is at a reasonable level. Simultaneously, the refraction of the edge light path is controlled, reducing stray light generation and improving image quality. The field of view of the VR visual system meets usage requirements, ensuring a sense of user immersion. Furthermore, controlling the thickness of the three lenses along the optical axis at a reasonable level results in a reasonable height for the VR visual system, facilitating miniaturization.

[0075] This application also improves the assembly stability of the second lens by having the first spacer element at least partially abut against it. Furthermore, by controlling the inner diameter of the display-side surface of the first spacer element, its fabrication feasibility is ensured.

[0076] Preferably, the inner diameter d1m of the display side surface of the first spacer element, the effective focal length f of the VR visual system, and half of the maximum field of view (Semi-FOV) of the VR visual system satisfy the following: 0.6 < (d1m / 2) / (f * tan(Semi-FOV)) < 0.9.

[0077] Preferably, the inner diameter d0m of the display side surface of the lens barrel, the axial distance TD from the eye side surface of the first lens to the display side surface of the third lens, the inner diameter d1m of the display side surface of the first spacer element, and the center thickness CT3 of the third lens satisfy the following condition: 5.5 <d0m / TD+d1m / CT3<6.9。

[0078] This embodiment may also include other parametric expressions from the first embodiment, which will not be elaborated here.

[0079] The VR visual system in this application can employ multiple lenses, such as the three lenses mentioned above. By rationally allocating the effective focal length, surface shape, center thickness of each lens, and on-axis distance between each lens, the aperture of the VR visual system can be effectively increased, the sensitivity of the lens can be reduced, and the manufacturability of the lens can be improved. This makes the VR visual system more conducive to production and processing and suitable for portable electronic devices such as smartphones.

[0080] In this application, at least one lens has 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 reducing distortion and astigmatism. By using an aspherical lens, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0081] However, those skilled in the art will understand that the number of lenses constituting the VR visual system can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although three lenses have been described as an example in the embodiments, the VR visual system is not limited to including three lenses. If necessary, the VR visual system may also include other numbers of lenses.

[0082] Figure 1 A schematic diagram of the structure of a VR visual system according to this application is shown. Figure 1 The diagram also labels parameters such as d1s, D0S, and D1bm to provide a clear and intuitive understanding of 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.

[0083] 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.

[0084] It should be noted that any one of the following embodiments, from Embodiment 1 to Embodiment 9, is applicable to all implementation methods of this application.

[0085] Example 1

[0086] like Figures 2 to 5 As shown, a VR viewing system according to Embodiment 1 of this application is described.

[0087] like Figure 2 As shown, the VR visual system, from the viewer's side to the display side, includes, in sequence, a first lens E1, a first auxiliary spacer element P1b, a second lens E2, a first spacer element P1, a reflective polarizing element ERP, a quarter-wave plate EQWP, and a third lens E3. Figure 2 As shown, the eye-side surface of the first lens is S1, the display-side surface of the first lens is S2, the eye-side surface of the second lens is S3, the display-side surface of the second lens is S4, the eye-side surface of the reflective polarizing element is S5, the display-side surface of the reflective polarizing element is S6, the eye-side surface of the quarter-wave plate is S6, the display-side surface of the quarter-wave plate is S7, the eye-side surface of the third lens is S7, and the display-side surface of the third lens is S8. A portion of the reflective layer is located on the display-side surface of the third lens.

[0088] Table 1 shows the basic structural parameters of the VR visual system in Embodiment 1, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0089] Face number Parts Surface type radius of curvature thickness Refractive index Dispersion coefficient Refraction / Reflection STO Stabilizer (STO) spherical 15 S1 First lens (E1) aspherical 13097.8258 8.4760 1.52 67.1 refraction S2 aspherical -43.2343 0.3000 refraction S3 Second lens (E2) aspherical 914.6438 2.5319 1.55 64.0 refraction S4 aspherical 3199.8126 0.3000 refraction S5 Reflective polarizing element (ERP) spherical endless 0.2000 1.50 57.0 refraction S6 Quarter-wave plate (EQWP) spherical endless 0.2000 1.50 57.0 refraction S7 Third lens (E3) spherical endless 14.7457 1.48 70.4 refraction S8 Partial reflective layer (BS) aspherical -101.6484 -14.7457 reflection S7 Quarter-wave plate (EQWP) spherical endless -0.2000 1.50 57.0 refraction S6 Reflective polarizing element (ERP) spherical endless 0.2000 reflection S7 Third lens (E3) spherical endless 14.7457 1.48 70.4 refraction S8 aspherical -101.6484 1.0000 refraction S9 light source spherical endless

[0090] Table 1

[0091] Table 1 also shows the location of the light source, S9.

[0092] In this embodiment, the eye-side and display-side surfaces of the first lens and the second lens, as well as the display-side surface 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:

[0093]

[0094] 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, A10, and A12 that can be used for each aspherical mirror in this embodiment.

[0095]

[0096]

[0097] Table 2

[0098] Figure 3 The on-axis chromatic aberration curve of the VR visual system of Embodiment 1 is shown, which indicates the focal point deviation of light of different wavelengths after passing through the VR visual system. Figure 4 The astigmatism curves of the VR visual system of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The distortion curve of the VR visual system in Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0099] according to Figures 3 to 5 As can be seen, the VR visual system given in Example 1 can achieve good imaging quality.

[0100] Example 2

[0101] The difference from Embodiment 1 is that the parameters of the lens barrel P0 and the spacer element are different.

[0102] like Figure 6 The image shows a VR viewing system according to Embodiment 2 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0103] In Embodiment 2 and Embodiment 1, the VR visual system shares the same parameters such as the radius of curvature, center thickness, inter-lens spacing, and higher-order image coefficients for the first to third lenses, as shown in Tables 1 and 2. However, the parameters such as the lens barrel P0, the thickness of the spacer element, the inner and outer diameters of the spacer element, and the distance between the spacer elements differ. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the VR visual system in this embodiment is as follows: Figures 3 to 5 As shown.

[0104] Example 3

[0105] The difference from Embodiment 1 is that the parameters of the lens barrel P0 and the spacer element are different.

[0106] like Figure 7 The image shows a VR viewing system according to Embodiment 3 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0107] In Embodiment 3, the curvature radius, center thickness, and other parameters of the first to third lenses of the VR visual system in Embodiment 1 are the same, as are the inter-lens spacing and higher-order image coefficients, as shown in Tables 1 and 2. However, the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter and outer diameter of the spacer element, and the distance between the spacer elements are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the VR visual system in this embodiment is as follows: Figures 3 to 5 As shown.

[0108] Example 4

[0109] The difference from Embodiment 1 is that the parameters of the lens barrel P0, the spacer element, and the lens are different.

[0110] like Figures 8 to 11 As shown, a VR viewing system according to Embodiment 4 of this application is described.

[0111] like Figure 8 As shown, the VR visual system, from the viewer's side to the display side, includes, in sequence, a first lens E1, a second lens E2, a first spacer element P1, a reflective polarizing element ERP, a quarter-wave plate EQWP, and a third lens E3. Figure 8 As shown, the eye-side surface of the first lens is S1, the display-side surface of the first lens is S2, the eye-side surface of the second lens is S3, the display-side surface of the second lens is S4, the eye-side surface of the reflective polarizing element is S5, the display-side surface of the reflective polarizing element is S6, the eye-side surface of the quarter-wave plate is S6, the display-side surface of the quarter-wave plate is S7, the eye-side surface of the third lens is S7, and the display-side surface of the third lens is S8. A portion of the reflective layer is located on the display-side surface of the third lens.

[0112] Table 3 shows the basic structural parameters of the VR visual system in Embodiment 4, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0113] Face number Parts Surface type radius of curvature thickness Refractive index Dispersion coefficient Refraction / Reflection STO Stabilizer (STO) spherical 15 S1 First lens (E1) aspherical -150.0108 6.3848 1.54 65.2 refraction S2 aspherical -40.8513 0.3000 refraction S3 Second lens (E2) aspherical 199.1757 3.3452 1.52 67.1 refraction S4 aspherical 1468.9197 0.4780 refraction S5 Reflective polarizing element (ERP) spherical endless 0.2000 1.50 57.0 refraction S6 Quarter-wave plate (EQWP) spherical endless 0.2000 1.50 57.0 refraction S7 Third lens (E3) spherical endless 16.3678 1.55 64.7 refraction S8 Partial reflective layer (BS) aspherical -107.4032 -16.3678 reflection S7 Quarter-wave plate (EQWP) spherical endless -0.2000 1.50 57.0 refraction S6 Reflective polarizing element (ERP) spherical endless 0.2000 reflection S7 Third lens (E3) spherical endless 16.3678 1.55 64.7 refraction S8 aspherical -107.4032 1.0000 refraction S9 light source spherical endless

[0114] Table 3

[0115] Table 3 also shows the location of the light source, S9.

[0116] In this embodiment, the eye-side surface and display-side surface of the first lens, the second lens, and the display-side surface of the third lens are all aspherical. The surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Embodiment 1.

[0117] Table 4 provides the higher-order coefficients that can be used for each aspherical mirror in this embodiment.

[0118] Face number A3 A4 A5 A6 A7 S1 -2.9444E-01 -1.9925E-02 2.4961E-02 2.5161E-03 -7.9626E-07 S2 -3.1680E-01 1.6839E-02 1.1965E-02 -7.2587E-03 -4.6750E-06 S3 1.0134E+00 -2.3992E-01 -6.4968E-04 -1.8503E-03 1.1533E-06 S4 -1.3532E+00 2.5291E-01 -7.7984E-03 3.2631E-02 -3.3763E-06 S8 -2.5918E-01 -7.4459E-02 -1.3396E-03 3.3869E-04 -4.5668E-04

[0119] Table 4

[0120] Figure 9 The on-axis chromatic aberration curve of the VR visual system of Embodiment 4 is shown, which represents the focal point deviation of light of different wavelengths after passing through the VR visual system. Figure 10 The astigmatism curves of the VR visual system of Embodiment 4 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 11The distortion curve of the VR visual system in Embodiment 4 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0121] according to Figures 9 to 11 As can be seen, the VR visual system given in Example 4 can achieve good imaging quality.

[0122] Example 5

[0123] The difference from Embodiment 4 is that the parameters of the lens barrel P0 and the spacer element are different.

[0124] like Figure 12 The image shows a VR viewing system according to Embodiment 5 of this application. For the sake of brevity, descriptions similar to those in Embodiment 4 are omitted.

[0125] In Embodiment 5 and Embodiment 4, the parameters such as the radius of curvature, center thickness, and inter-lens spacing and higher-order image coefficients of the first to third lenses of the VR visual system are the same, as shown in Tables 3 and 4. However, the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter and outer diameter of the spacer element, and the distance between the spacer elements are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the VR visual system in this embodiment is as follows: Figures 9 to 11 As shown.

[0126] Example 6

[0127] The difference from Embodiment 4 is that the parameters of the lens barrel P0 and the spacer element are different.

[0128] like Figure 13 The following describes a VR viewing system according to Embodiment Six of this application. For the sake of brevity, descriptions similar to those in Embodiment Four are omitted.

[0129] In Embodiments 6 and 4, the parameters such as the radius of curvature, center thickness, and inter-lens spacing and higher-order image coefficients of the first to third lenses in the VR visual system are the same, as shown in Tables 3 and 4. However, the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter and outer diameter of the spacer element, and the distance between the spacer elements are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the VR visual system in this embodiment is as follows: Figures 9 to 11 As shown.

[0130] Example 7

[0131] The difference from Embodiment 1 is that the parameters of the lens barrel P0, the spacer element, and the lens are different.

[0132] like Figures 14 to 17The image shows a VR viewing system according to Embodiment Seven of this application.

[0133] like Figure 14 As shown, the VR visual system, from the viewer's side to the display side, includes, in sequence, a first lens E1, a second lens E2, a first spacer element P1, a reflective polarizing element ERP, a quarter-wave plate EQWP, and a third lens E3. Figure 14 As shown, the eye-side surface of the first lens is S1, the display-side surface of the first lens is S2, the eye-side surface of the second lens is S3, the display-side surface of the second lens is S4, the eye-side surface of the reflective polarizing element is S5, the display-side surface of the reflective polarizing element is S6, the eye-side surface of the quarter-wave plate is S6, the display-side surface of the quarter-wave plate is S7, the eye-side surface of the third lens is S7, and the display-side surface of the third lens is S8. A portion of the reflective layer is located on the display-side surface of the third lens.

[0134] Table 5 shows the basic structural parameters of the VR visual system in Embodiment 7, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0135]

[0136]

[0137] Table 5

[0138] Table 5 also shows the location of the light source, S9.

[0139] In this embodiment, the eye-side surface and display-side surface of the first lens, the second lens, and the display-side surface of the third lens are all aspherical. The surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Embodiment 1.

[0140] Table 6 provides the higher-order coefficients that can be used for each aspherical mirror in this embodiment.

[0141] Face number A4 A6 A8 A10 A12 S1 1.9986E+01 -4.9489E-01 -5.1091E-02 1.8762E-02 2.5851E-03 S2 3.3695E+01 -1.7343E+00 -1.0323E-01 7.2411E-02 -7.2359E-03 S3 2.9910E+01 7.5280E-01 2.2337E-02 -8.1517E-02 6.5291E-03 S4 3.1735E+01 -7.8725E-01 -1.7258E-01 1.4358E-01 1.6180E-02 S8 2.7542E+01 1.1421E-01 -2.8079E-02 1.9803E-04 8.5388E-04

[0142] Table 6

[0143] Figure 15 The on-axis chromatic aberration curve of the VR visual system of Embodiment 7 is shown, which indicates the focal point deviation of light of different wavelengths after passing through the VR visual system. Figure 16 The astigmatic curves of the VR visual system of Embodiment 7 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 17 The distortion curve of the VR visual system of Embodiment 7 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0144] according to Figures 15 to 17As can be seen, the VR visual system given in Example 7 can achieve good imaging quality.

[0145] Example 8

[0146] The difference from Embodiment 7 is that the parameters of the lens barrel P0 and the spacer element are different.

[0147] like Figure 18 The image shows a VR viewing system according to Embodiment 8 of this application. For the sake of brevity, descriptions similar to those in Embodiment 7 will be omitted.

[0148] In Embodiment 8 and Embodiment 7, the parameters such as the radius of curvature, center thickness, and inter-lens spacing and higher-order image coefficients of the first to third lenses of the VR visual system are the same, as shown in Tables 5 and 6. However, the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter and outer diameter of the spacer element, and the distance between the spacer elements are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the VR visual system in this embodiment is as follows: Figures 15 to 17 As shown.

[0149] Example 9

[0150] The difference from Embodiment 7 is that the parameters of the lens barrel P0 and the spacer element are different.

[0151] like Figure 19 The following describes a VR viewing system according to Embodiment Nine of this application. For the sake of brevity, descriptions similar to those in Embodiment Seven are omitted.

[0152] In Embodiment 9 and Embodiment 7, the parameters such as the radius of curvature, center thickness, and inter-lens spacing and higher-order image coefficients of the first to third lenses of the VR visual system are the same, as shown in Tables 5 and 6. However, the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter and outer diameter of the spacer element, and the distance between the spacer elements are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the VR visual system in this embodiment is as follows: Figures 15 to 17 As shown.

[0153] In summary, in the above embodiments one to nine, the reflective polarizing element ERP, the quarter-wave plate EQWP, and the third lens E3 are bonded together to form the third optical element. That is, the display side surface of the reflective polarizing element and the eye side surface of the quarter-wave plate are both S6, and the display side surface of the quarter-wave plate and the eye side surface of the third lens are both S7.

[0154] The following is combined with Figure 2The 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 and the eye-side surface S7 of the third lens before entering the display-side surface S7 of the quarter-wave plate. The quarter-wave plate converts the light into a first polarization state. The first polarization state light enters the display-side surface S6 of the reflective polarizing element and is reflected to form the first reflected light. The first reflected light enters the eye-side surface S6 of the quarter-wave plate, where the quarter-wave plate converts the first reflected light into a second polarization state. The second polarization state light passes through the eye-side surface S7 of the third lens and reaches the display-side surface S8 of the third lens. 8. The light is reflected by a portion of the reflective layer on the display side surface S8 of the third lens to form a second reflected light. The second reflected light is incident on the display side surface S7 of the quarter-wave plate. The quarter-wave plate converts the second reflected light into light of the third polarization state. The light of the third polarization state is incident on the display side surface S6 of the reflective polarizing element and is transmitted by the display side surface S6 of the reflective polarizing element. The transmitted light passes sequentially through the eye side surface S5 of the reflective polarizing element, the display side surface S4 of the second lens, the eye side surface S3 of the second lens, 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.

[0155] It should be noted that during the process of the light in the first polarization state changing to the third polarization state, it passes through two quarter-wave plates, thus making the polarization direction of the light in the first polarization state perpendicular to the polarization direction of the light in the third polarization state. Therefore, the reflective polarizing element reflects the light in the first polarization state and transmits the light in the third polarization state. In summary, Examples 1 to 9 respectively satisfy the relationships shown in Table 7.

[0156]

[0157]

[0158] Table 7

[0159] Table 8 provides some parameters of the VR visual systems of Examples 1 to 9.

[0160] Parameters / Examples 1 2 3 4 5 6 7 8 9 d1s 58.45 58.85 58.85 57.57 58.07 58.43 55.22 55.17 54.25 d1m 58.45 58.85 58.85 57.57 58.07 58.43 55.22 55.17 54.25 D1s 71.89 71.29 68.49 71.89 71.19 68.99 71.17 62.21 67.37 D1bs 61.06 61.01 58.45 / / / / / / D1bm 66.25 65.19 62.66 / / / / / / d0s 45.21 44.86 44.39 41.92 41.23 41.23 42.73 42.73 42.73 d0m 76.18 75.58 75.33 76.18 75.06 74.46 74.56 72.99 72.60 D0s 66.60 64.51 61.21 52.27 53.38 53.38 53.61 52.85 52.31 D0m 78.66 77.46 76.21 78.66 77.16 75.56 77.72 76.15 75.08 EP01 15.02 15.50 14.85 14.82 14.80 14.75 13.03 13.01 11.65 CP1 0.03 0.05 0.10 0.03 0.05 0.10 0.03 0.05 0.11 CP1b 6.75 6.15 6.67 / / / / / / L 31.41 31.41 30.41 32.83 32.83 32.06 28.87 28.37 32.32

[0161] Table 8

[0162] Table 9 shows the effective focal length and F-number fno of the first to third lenses of the VR visual systems of Embodiments 1 to 9.

[0163] Example parameters 1 2 3 4 5 6 7 8 9 TD(mm) 26.75 26.75 26.75 27.28 27.28 27.28 26.39 26.39 26.39 f(mm) 25.56 25.56 25.56 26.63 26.63 26.63 30.05 30.05 30.05 f1(mm) 77.13 77.13 77.13 100.68 100.68 100.68 121.73 121.73 121.73 f2 (mm) 521.76 521.76 521.76 312.16 312.16 312.16 269.35 269.35 269.35 f3 (mm) -50.82 -50.82 -50.82 -53.70 -53.70 -53.70 40.05 40.05 40.05 ET23(mm) 0.53 0.53 0.53 0.57 0.57 0.57 0.66 0.66 0.66 fno 5.11 5.11 5.11 5.33 5.33 5.33 6.01 6.01 6.01 Semi-FOV (°) 53.00 53.00 53.00 53.00 53.00 53.00 52.81 52.81 52.81

[0164] Table 9

[0165] 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.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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 by, The lens number of the VR visual system is three, and the VR visual system sequentially comprises, from the eye side to the display side: a first optical element consisting of a first lens; a second optical element consisting of a second lens; a third optical element consisting of a reflective polarizing element, a quarter-wave plate and a third lens which are sequentially attached together, the Abbe numbers of the first lens, the second lens and the third lens are all greater than 60, the first lens, the second lens and the third lens all have an eye side surface away from a light source and a display side surface close to the light source, the display side surface of the third lens has a partial reflection layer, the display side surface of the quarter-wave plate at least partially contacts the eye side surface of the third lens, the eye side surface of the quarter-wave plate at least partially contacts the display side surface of the reflective polarizing element, and the reflective polarizing element can reflect light of a first polarization state and transmit light of a third polarization state; the first lens has positive focal power, and the display side surface of the first lens is convex; the second lens has positive focal power, the eye side surface of the second lens is convex, and the display side surface of the second lens is concave; the eye side surface of the third lens is flat, and the display side surface of the third lens is convex; the VR visual system further comprises a plurality of spacing elements, the plurality of spacing elements at least comprises a first spacing element, and the first spacing element is adjacent to and at least partially bears against the display side surface of the second lens; the VR visual system further comprises a lens barrel, and the first optical element to the third optical element and the plurality of spacing elements are all contained in the lens barrel; wherein the gap distance ET23 from the maximum effective diameter edge of the display side surface of the second lens to the maximum effective diameter edge of the eye side surface of the third lens satisfies: 0.53mm≤ET23≤0.66mm; the on-axis distance EP01 from the eye side surface of the lens barrel to the eye side surface of the first spacing element, the effective focal length f of the VR visual system satisfy: 0.39≤EP01 / f≤0.61; the inner diameter d1m of the display side surface of the first spacing element, the effective focal length f of the VR visual system, and half of the maximum field angle Semi-FOV of the VR visual system satisfy: 0.68≤(d1m / 2) / (f*tan(Semi-FOV))≤0.

87.

2. The VR viewing system of claim 1, wherein, the on-axis distance TD from the eye side surface of the first lens to the display side surface of the third lens, the on-axis distance EP01 from the eye side surface of the lens barrel to the eye side surface of the first spacing element, and the maximum length L from the eye side surface of the lens barrel to the display side surface of the lens barrel satisfy: 2.58≤TD / EP01+TD / L≤3.

08.

3. The VR viewing system of claim 1, wherein, The effective focal length f of the VR visual system, the outer diameter D1s of the object side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 1.86≤f / (D1s-d1s)≤4.

27.

4. The VR viewing system of claim 1, wherein, The on-axis distance EP01 from the object side surface of the lens barrel to the object side surface of the first spacer element, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy: 1.35≤EP01 / (CT1+CT2)≤1.

66.

5. The VR viewing system of claim 1, wherein, The outer diameter D0s of the object side surface of the lens barrel, the inner diameter d0s of the object side surface of the lens barrel, the maximum length L from the object side surface of the lens barrel to the display side surface of the lens barrel, and the effective focal length f of the VR visual system satisfy: -9.26≤(D0s-d0s) / (L-f)≤4.

21.

6. The VR viewing system of claim 1, wherein, The entrance pupil diameter EPD of the VR visual system, the on-axis distance T23 from the display side surface of the second lens to the object side surface of the third lens, and the center thickness CP1 of the first spacer element satisfy: 5.9≤EPD / (T23-CP1)≤12.

82.

7. The VR viewing system of claim 1, wherein, The outer diameter D0m of the display side surface of the lens barrel, the outer diameter D0s of the object side surface of the lens barrel, the entrance pupil diameter EPD of the VR visual system, and the effective focal length f of the VR visual system satisfy: 12.96≤D0m / f+D0s / EPD≤16.

40.

8. The VR viewing system of claim 1, wherein, The inner diameter d0m of the display side surface of the lens barrel, the on-axis distance TD from the object side surface of the first lens to the display side surface of the third lens, the inner diameter d1m of the display side surface of the first spacer element, and the center thickness CT3 of the third lens satisfy: 5.77≤d0m / TD+d1m / CT3≤6.

82.

9. The VR viewing system of claim 1, wherein, When the center thickness CT1 of the first lens and the center thickness CT2 of the second lens satisfy: 1.77≤CT1 / CT2≤3.35, the plurality of spacer elements further comprises a first auxiliary spacer element, and the first auxiliary spacer element at least partially abuts against the display side surface of the first lens.

10. The VR viewing system of claim 9, wherein, The effective focal length f2 of the second lens, the effective focal length f1 of the first lens, the maximum length L from the object side surface of the lens barrel to the display side surface of the lens barrel, and the center thickness CP1b of the first auxiliary spacer element satisfy: 1.66≤f2 / f1-L / CP1b≤2.

21.

11. The VR viewing system of claim 9, wherein, The center thickness CP1 of the first spacer element, the center thickness CP1b of the first auxiliary spacer element, the effective focal length f1 of the first lens, and the effective focal length f3 of the third lens satisfy: 0.24≤(CP1+CP1b) / (f1+f3)≤0.

26.

12. The VR viewing system of claim 9, wherein, A radius of curvature R3 of an eye side surface of the second lens, an outer diameter D1bm of an display side surface of the first auxiliary spacer element, a radius of curvature R2 of a display side surface of the first lens, and an outer diameter D1bs of an eye side surface of the first auxiliary spacer element satisfy: 14.51 ≤ R3 / D1bm-R2 / D1bs ≤ 15.34.

Images