VR visual system

Abstract

The invention provides a VR visual system, and the system comprises a first optical element which comprises a first lens; a second optical element including a second lens; the third optical element comprises a third lens, and the first lens, the second lens and the third lens are provided with partial reflection layers; the first spacer element partially bears against the display side surface of the second lens; a lens barrel; a gap distance ET23 from a maximum effective diameter edge of a display side surface of the second lens to a maximum effective diameter edge of an eye side surface of the third lens satisfies: 0.5 mmlt; eT231t, ET231t; the thickness is 0.7 mm; the on-axis distance EP01 from the eye side surface of the lens cone to the eye side surface of the first spacing element and the effective focal length f of the VR visual system meet the following conditions: 0 lt; eP01 / flt, EP01 / flt; 0.8; 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 the half Semi-FOV of the maximum field angle of the VR visual system meet the following conditions: 0.5 lt; (d1m / 2) / (f * tan (Semi-FOV)) lt; 1. According to the invention, the problem that high image quality, large field angle and miniaturization of a VR visual system in the prior art are difficult to consider at the same time is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging equipment, and in particular to a VR visual system. Background Art

[0002] VR (Virtual Reality, VR for short) visual system is an application system of virtual reality technology, which combines virtual reality technology and visual technology to provide users with an immersive virtual experience. VR visual system has a wide range of applications, including game entertainment, education and training, health care, architectural design, etc. Through the VR visual system, users can experience the virtual environment in person and get a more immersive and interactive experience. However, as VR devices develop towards miniaturization, it is very difficult to reduce the volume of the existing three-piece VR visual system in order to ensure the imaging quality, and it cannot be adapted to miniaturized VR devices. In addition, in the process of miniaturization, the optical path of the system is affected, and the change in the deflection direction of the light makes it difficult to guarantee the field of view of the VR visual system, thereby affecting the user's visual effect and immersive experience. In other words, how to control the optical parameters of the VR visual system and the inner diameter size of the spacer element, while ensuring high image quality and a large field of view, is a problem that needs to be solved urgently. Summary of the invention

[0003] The main purpose of the present invention is to provide a VR visual system to solve the problem in the prior art that it is difficult to achieve a balance between high image quality, a large field of view and miniaturization in 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 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 gap 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: 0.5 mm < ET23 < 0.7 mm; 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 field of view 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 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 against it; 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 field of view 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, field of view 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, so that the field of view angle of the VR visual system meets the use requirements, ensuring 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, 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. 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 of view 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 on-axis 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 of view 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 of view 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.

[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] Furthermore, 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 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.

[0010] Furthermore, 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] Furthermore, 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.

[0012] Furthermore, 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.

[0013] Furthermore, 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 central thickness CP1 of the first spacer element satisfy: 5 < EPD / (T23 - CP1) < 15.

[0014] Furthermore, 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.

[0015] Furthermore, the inner diameter d0m of the display-side surface of the lens 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 central thickness CT3 of the third lens satisfy: 5 < d0m / TD + d1m / CT3 < 7.

[0016] Furthermore, when the central thickness CT1 of the first lens and the central 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 is at least partially in contact with the display-side surface of the first lens.

[0017] Further, the following relationships 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 relationships 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 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.

[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 includes at least a first lens; the second optical element includes at least a second lens; the third optical element includes at least 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 surfaces or display-side surfaces of the first lens, the second lens, and the third lens has a partial reflection layer; the plurality of spacer elements include at least 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 thereon; 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 of view Semi-FOV of the VR visual system satisfy: 0.5 < (d1m / 2) / (f * tan(Semi-FOV)) < 1.

[0021] The present application provides a VR visual system with three optical elements. By controlling the effective focal length, field of view angle, inner diameter of the spacing element and 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 constrained, the refraction of the edge light path is controlled, the generation of stray light is reduced, and the imaging quality is improved, so that the field of view angle of the VR visual system meets the use requirements and the user's immersive feeling is guaranteed. 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 conducive to miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

[0024] Figure 2 A schematic diagram of the structure of a VR visual system according to the first embodiment of the present invention is shown;

[0025] Figures 3 to 5 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first embodiment of the present invention are respectively shown;

[0026] Figure 6 A schematic diagram of the structure of a VR visual system according to a second embodiment of the present invention is shown;

[0027] Figure 7 A schematic diagram of the structure of a VR visual system according to a third embodiment of the present invention is shown;

[0028] Figure 8 A schematic diagram of the structure of a VR visual system according to a fourth embodiment of the present invention is shown;

[0029] Figures 9 to 11 The axial chromatic aberration curve, the astigmatism curve and the distortion chromatic aberration curve of the fourth embodiment of the present invention are respectively shown;

[0030] Fig.12 A schematic diagram of the structure of a VR visual system according to a fifth embodiment of the present invention is shown;

[0031] Fig.13 A schematic diagram of the structure of a VR visual system according to a sixth embodiment of the present invention is shown;

[0032] Fig.14 A structural schematic diagram of a VR visual system according to a seventh embodiment of the present invention is shown;

[0033] Figures 15 to 17The axial chromatic aberration curve, the astigmatism curve and the distortion chromatic aberration curve of the seventh embodiment of the present invention are respectively shown;

[0034] Fig.18 A schematic diagram of the structure of a VR visual system according to an eighth embodiment of the present invention is shown;

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

[0036] The above drawings 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 spacing 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 a 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 spacing element; E3, third lens; S8, display-side surface of the third lens. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0040] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0041] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0042] In the 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 shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0043] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of ordinary knowledgeable people in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the eye-side surface, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the display-side surface, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0044] In order to solve the problem in the prior art that it is difficult to achieve a balance between high image quality, a large field of view and miniaturization in a VR visual system, the present invention provides a VR visual system.

[0045] First embodiment

[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 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 surface away from the light source and a display surface close to the light source. At least one of the ocular surfaces or display 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 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 clearance distance ET23 from the maximum effective diameter edge of the display surface of the second lens to the maximum effective diameter edge of the ocular surface of the third lens satisfies: 0.5mm < ET23 < 0.7mm; the axial distance EP01 from the ocular surface of the barrel to the ocular 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 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.

[0047] 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, the spacing from the barrel, the Abbe number of the lens, and the spacing of the effective diameter edges of the lens of the VR visual system, the internal light 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, the imaging quality is improved, the field of view of the VR visual system meets the usage requirements, the user's usage 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.

[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 surface of the first spacer element, its processing feasibility is ensured.

[0049] Preferably, the clearance distance ET23 from the maximum effective diameter edge of the display surface of the second lens to the maximum effective diameter edge of the ocular surface of the third lens satisfies: 0.51mm < ET23 < 0.68mm.

[0050] Preferably, the on-axis 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 field of view 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 reflective layer on the third lens, the folding back of the optical path is achieved. In the case of obtaining the same FOV, the height of the VR visual system is reduced, which is beneficial to the miniaturization of the VR device and improves the possibility of long-term wearing by users. 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 pasting is achieved, reducing the number of film pasting processes and improving production efficiency. At the same time, one-time planar film pasting reduces the difficulty of film pasting and improves the feasibility of process processing.

[0053] In this embodiment, a partial reflective 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 reflective layer is deposited 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. In the case of obtaining the same field of view, 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, and the process difficulty is reduced through planar film pasting, improving the production yield.

[0054] In this embodiment, 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 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 restricting 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, and 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 of view 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 beam constraint, 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 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. 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 on-axis distance from the display-side surface of the second lens to the ocular-side surface of the third lens, the center thickness of the second lens is at a reasonable level, so that the diopter of the second lens meets the design requirements. At the same time, by controlling the center 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 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. By restricting D0m / f + D0s / EPD within a reasonable range, the effective focal length of the VR visual system is controlled, so that 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 barrel, the amount of incident light can be effectively controlled, and the light can be utilized more efficiently to participate in imaging, the reflection path of the redundant light can be better changed, the generation of stray light can be reduced, and the clarity of imaging 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 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. By restricting d0m / TD + d1m / CT3 within a reasonable range, the center thickness of the third lens is controlled, so that the optical power of the third lens is at a reasonable level. Further, by combining and controlling the on-axis 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 the miniaturization of the module. At the same time, by controlling the inner diameter of the display-side surface of the barrel and the inner diameter of the display-side surface of the first spacer element, the beam diameter of the system is restricted, so that 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 abuts at least partially against the display side surface of the first lens. By limiting 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 is helpful for 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 limiting 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 limiting (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 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. 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 processability, it is beneficial to control the aperture at the front end of the VR visual system, facilitating 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 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 surfaces or 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 following conditions 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 field of view Semi-FOV of the VR visual system: 0.5 < (d1m / 2) / (f * tan(Semi-FOV)) < 1; the following conditions 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] The present application provides a VR visual system with three optical elements. By controlling the effective focal length, field of view angle, inner and outer diameters of the spacing element, and the Abbe number of the lens of the VR visual system, the internal light beam path and luminous 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, so that the field of view angle of the VR visual system meets the use requirements and ensures the user's immersive feeling. 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 conducive to miniaturization.

[0068] The present application also uses three lenses to make the effective focal length of the VR visual system meet the requirements, so that the aberration of the system is at a reasonable level, which is beneficial to the imaging of the system. At the same time, the first spacing element is at least partially supported by the second lens, which improves the assembly stability of the second lens. And by controlling the outer diameter and inner diameter of the eye side surface of the first spacing element, its processing feasibility is guaranteed.

[0069] Preferably, 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 of view Semi-FOV of the VR visual system satisfy the following relationship: 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 spacing element, and the inner diameter d1s of the eye-side surface of the first spacing element satisfy the following relationship: 1.5 <f / (D1s-d1s)<4.5。

[0071] This embodiment may also include other parameter formulas in the first embodiment, which will not be described in detail here.

[0072] Third embodiment

[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 in sequence from the eye side to the display side, and the VR visual system also includes a plurality of spacing 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; the third optical element includes at least 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 all 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 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 spacing elements include at least a first spacing element, the third spacing element and the eye side surface. A spacing element is adjacent to and at least partially supported by the display side surface of the second lens; the first optical element to the third optical element and the plurality of spacing elements are all contained in the lens barrel; wherein 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 the half of the maximum field of view angle Semi-FOV of the VR visual system satisfy the following conditions: 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 spacing element, and the center thickness CT3 of the third lens satisfy the following conditions: 5 <d0m / TD+d1m / CT3<7。

[0074] The present application provides a VR visual system with three optical elements. By controlling the effective focal length, field of view angle, inner diameter of the spacing element, Abbe number of the lens, length of the optical element, and center thickness of the third lens of the VR visual system, the internal beam path and beam diameter of the VR visual system are constrained, 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, the generation of stray light is reduced, the imaging quality is improved, the field of view angle of the VR visual system meets the use requirements, and the user's immersion is guaranteed. 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 conducive to miniaturization.

[0075] The present application also improves the assembly stability of the second lens by at least partially supporting the first spacing element and further ensures the processing feasibility by controlling the inner diameter of the display side surface of the first spacing element.

[0076] Preferably, 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 of view Semi-FOV of the VR visual system satisfy the following relationship: 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 spacing element, and the center thickness CT3 of the third lens satisfy the following relationship: 5.5 <d0m / TD+d1m / CT3<6.9。

[0078] This embodiment may also include other parameter formulas in the first embodiment, which will not be described in detail here.

[0079] The VR visual system in this application may use multiple lenses, such as the three lenses mentioned above. By reasonably allocating the effective focal length, surface shape, center thickness of each lens, and axial distance between lenses, 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 smartphones.

[0080] In the present application, at least one lens has an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0081] However, those skilled in the art should understand that, without departing from the technical solution 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 three lenses are described as an example in the embodiment, 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 structural schematic diagram of a VR visual system of the present application is shown. Figure 1 Parameters such as d1s, D0S, and D1bm are also indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the display of the VR visual system structure and the specific face shape, these parameters will no longer be reflected in the accompanying drawings when describing specific examples later.

[0083] The following further describes examples of specific face shapes and parameters of the VR visual system that can be applied to the above-mentioned implementation mode with reference to the accompanying drawings.

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

[0085] Embodiment 1

[0086] like Figures 2 to 5 As shown, the VR visual system of embodiment 1 of the present application is described.

[0087] like Figure 2 As shown, the VR visual system includes 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 in order from the eye side to the display side. 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. The partial reflective layer is located on the display side surface of the third lens.

[0088] Table 1 shows a basic structural parameter table of the VR visual system of Example 1, wherein the units of the curvature radius, 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 Aperture (STO) Spherical 15 S1 First lens (E1) Aspheric 13097.8258 8.4760 1.52 67.1 refraction S2 Aspheric -43.2343 0.3000 refraction S3 Second lens (E2) Aspheric 914.6438 2.5319 1.55 64.0 refraction S4 Aspheric 3199.8126 0.3000 refraction S5 Reflective Polarizer (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 Partially reflective layer (BS) Aspheric -101.6484 -14.7457 reflection S7 Quarter Wave Plate (EQWP) Spherical endless -0.2000 1.50 57.0 refraction S6 Reflective Polarizer (ERP) Spherical endless 0.2000 reflection S7 Third lens (E3) Spherical endless 14.7457 1.48 70.4 refraction S8 Aspheric -101.6484 1.0000 refraction S9 light source Spherical endless

[0090] Table 1

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

[0092] In this embodiment, the eye-side surface and the display-side surface of the first lens, the second lens, and the display-side surface of the third lens are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0093]

[0094] Among them, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. The following Table 2 lists the high-order coefficients A4, A6, A8, A10, and A12 that can be used for each aspherical mirror surface in this embodiment.

[0095]

[0096]

[0097] Table 2

[0098] Figure 3 The axial chromatic aberration curve of the VR visual system of Example 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 curve of the VR visual system of the first embodiment is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The distortion curve of the VR visual system of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different field of view angles.

[0099] according to Figures 3 to 5 It can be seen that the VR visual system provided in Example 1 can achieve good imaging quality.

[0100] Embodiment 2

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

[0102] like Figure 6 As shown, the VR visual system of the second embodiment of the present application is described. For the sake of brevity, some descriptions similar to the first embodiment will be omitted.

[0103] The parameters of the curvature radius, center thickness, etc. of the first to third lenses of the VR visual system in the second embodiment and the first embodiment, as well as the spacing distance between the lenses and the high-order image coefficients are the same, as shown in Table 1 and Table 2, but the parameters such as the lens barrel P0, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the distance between the spacing elements are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different. Therefore, the imaging quality of the VR visual system of this embodiment is as follows: Figures 3 to 5 shown.

[0104] Embodiment 3

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

[0106] like Figure 7 As shown, the VR visual system of the third embodiment of the present application is described. For the sake of brevity, some descriptions similar to the first embodiment will be omitted.

[0107] The parameters of the curvature radius, center thickness, etc. of the first to third lenses of the VR visual system in the third embodiment and the first embodiment, as well as the spacing distance between the lenses and the high-order image coefficients are the same, as shown in Table 1 and Table 2, but the parameters such as the lens barrel P0, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the distance between the spacing elements are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different. Therefore, the imaging quality of the VR visual system of this embodiment is as shown in Table 1. Figures 3 to 5 shown.

[0108] Embodiment 4

[0109] The difference from the first embodiment 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, the VR visual system of embodiment 4 of the present application is described.

[0111] like Figure 8 As shown, the VR visual system includes a first lens E1, a second lens E2, a first spacing element P1, a reflective polarizing element ERP, a quarter wave plate EQWP, and a third lens E3 in order from the eye side to the display side. 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. The partial reflective layer is located on the display side surface of the third lens.

[0112] Table 3 shows the basic structural parameter table of the VR visual system of Example 4, wherein the units of the curvature radius, 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 Aperture (STO) Spherical 15 S1 First lens (E1) Aspheric -150.0108 6.3848 1.54 65.2 refraction S2 Aspheric -40.8513 0.3000 refraction S3 Second lens (E2) Aspheric 199.1757 3.3452 1.52 67.1 refraction S4 Aspheric 1468.9197 0.4780 refraction S5 Reflective Polarizer (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 Partially reflective layer (BS) Aspheric -107.4032 -16.3678 reflection S7 Quarter Wave Plate (EQWP) Spherical endless -0.2000 1.50 57.0 refraction S6 Reflective Polarizer (ERP) Spherical endless 0.2000 reflection S7 Third lens (E3) Spherical endless 16.3678 1.55 64.7 refraction S8 Aspheric -107.4032 1.0000 refraction S9 light source Spherical endless

[0114] Table 3

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

[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 surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, formula (1) in the first embodiment.

[0117] Table 4 lists the high-order coefficients of the aspherical mirror surfaces that can be used 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] Fig. 9 The axial chromatic aberration curve of the VR visual system of Example 4 is shown, which indicates the focal point deviation of light of different wavelengths after passing through the VR visual system. Fig.10 The astigmatism curve of the VR visual system of Example 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig.11The distortion curve of the VR visual system of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different field of view angles.

[0121] according to Figures 9 to 11 It can be seen that the VR visual system provided in Example 4 can achieve good imaging quality.

[0122] Embodiment 5

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

[0124] like Fig.12 As shown, the VR visual system of the fifth embodiment of the present application is described. For the sake of brevity, some descriptions similar to the fourth embodiment will be omitted.

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

[0126] Embodiment 6

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

[0128] like Fig.13 As shown, the VR visual system of the sixth embodiment of the present application is described. For the sake of brevity, some descriptions similar to the fourth embodiment will be omitted.

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

[0130] Embodiment 7

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

[0132] like Figures 14 to 17As shown, the VR visual system of embodiment 7 of the present application is described.

[0133] like Fig.14 As shown, the VR visual system includes a first lens E1, a second lens E2, a first spacing element P1, a reflective polarizing element ERP, a quarter wave plate EQWP, and a third lens E3 in order from the eye side to the display side. Fig.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. The partial reflective layer is located on the display side surface of the third lens.

[0134] Table 5 shows a basic structural parameter table of the VR visual system of Example 7, wherein the units of the curvature radius, thickness / distance, and effective focal length are all millimeters (mm).

[0135]

[0136]

[0137] Table 5

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

[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 surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, formula (1) in the first embodiment.

[0140] Table 6 lists the high-order coefficients of the aspherical mirror surfaces that can be used 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] Fig.15 The axial chromatic aberration curve of the VR visual system of Example 7 is shown, which indicates the focal point deviation of light of different wavelengths after passing through the VR visual system. Fig.16 The astigmatism curve of the VR visual system of Example 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig.17 The distortion curve of the VR visual system of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different field of view angles.

[0144] according to Figures 15 to 17It can be seen that the VR visual system provided in Example 7 can achieve good imaging quality.

[0145] Embodiment 8

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

[0147] like Fig.18 As shown, the VR visual system of the eighth embodiment of the present application is described. For the sake of brevity, some descriptions similar to the seventh embodiment will be omitted.

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

[0149] Embodiment 9

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

[0151] like Fig.19 As shown, the VR visual system of the ninth embodiment of the present application is described. For the sake of brevity, some descriptions similar to those of the seventh embodiment will be omitted.

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

[0153] In summary, in the above-mentioned embodiments 1 to 9, the reflective polarizing element ERP, the quarter-wave plate EQWP and the third lens E3 are bonded together to form a 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] Combine the following Figure 2The direction of the light emitted by the light source S9 is described. The light emitted by the light source S9 passes through the display side surface S8 of the third lens and the eye side surface S7 of the third lens in sequence, and then enters the display side surface S7 of the quarter wave plate. The quarter wave plate converts the light into a light of a first polarization state. The light of the first polarization state enters the display side surface S6 of the reflective polarizing element and is reflected to form a first reflected light. The first reflected light enters the eye side surface S6 of the quarter wave plate. The quarter wave plate converts the first reflected light into a light of a second polarization state. The light of the second polarization state passes through the eye side surface S7 of the third lens and reaches the display side surface S7 of the third lens. 8, and is reflected by a partial reflection 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 a light of a 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 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, the eye side surface S1 of the first lens in sequence, and then is emitted to the aperture STO.

[0155] It should be noted that, in the process of the light of the first polarization state being converted into the light of the third polarization state, it passes through the quarter wave plate twice, so that the polarization direction of the light of the first polarization state is perpendicular to the polarization direction of the light of the third polarization state, so the reflective polarizing element reflects the light of the first polarization state and transmits the light of the third polarization state. In summary, Examples 1 to 9 respectively satisfy the relationship shown in Table 7.

[0156]

[0157]

[0158] Table 7

[0159] Table 8 gives some parameters of the VR visual system 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 / / / / / / D1b 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 gives the effective focal lengths and F-numbers fno of the first to third lenses of the VR visual systems of Examples 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] The present application also provides an imaging device, whose electronic photosensitive element may be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the VR visual system described above.

[0166] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0167] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0168] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0169] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A VR visual system, characterized in that: From the eye side to the display side, it includes: a first optical element, the first optical element comprising at least a first lens; a second optical element, the second optical element comprising at least a second lens; a third optical element, the third optical element at least comprising 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 a light source and a display-side surface close to the light source, and at least one of the first lens, the second lens and the third lens has a partial reflective layer on the eye-side surface or the display-side surface; The VR visual system further comprises a plurality of spacer elements, wherein the plurality of spacer elements comprises at least a first spacer element, wherein the first spacer element is adjacent to and at least partially bears against a display side surface of the second lens; The VR visual system further comprises a lens barrel, wherein the first optical element to the third optical element and the plurality of spacer elements are all accommodated in the lens barrel; 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: 0.5 mm <ET23<0.7mm; 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 effective focal length f of the VR visual system satisfy the following conditions: <EP01 / f<0.8; 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 of view Semi-FOV of the VR visual system satisfy the following: 0.5<(d1m / 2) / (f*tan(Semi-FOV))<1.

2. The VR visual system according to claim 1, characterized in that: The third optical element also includes a reflective polarizing element and a quarter wave plate, wherein the display side surface of the quarter wave plate is at least partially in contact with the eye side surface of the third lens, and the eye side surface of the quarter wave plate is at least partially in contact with the display side surface of the reflective polarizing element.

3. The VR visual system according to claim 1, characterized in that: The display side surface of the third lens has a partial reflection layer, and the eye side surface of the third lens is a plane.

4. The VR visual system according to claim 1, characterized in that: The axial distance TD from the eye side surface of the first lens to the display side surface of the third lens, the axial distance EP01 from the eye side surface of the lens barrel to the eye side surface of the first spacer, and the maximum length L from the eye side surface of the lens barrel to the display side surface of the lens barrel satisfy the following conditions: <TD / EP01+TD / L<4。 5. The VR visual system according to claim 1, characterized in that: The effective focal length f of the VR visual system, the outer diameter D1s of the eye-side surface of the first spacing element, and the inner diameter d1s of the eye-side surface of the first spacing element satisfy the following conditions: 1 <f / (D1s-d1s)<5。 6. The VR visual system according to claim 1, characterized in that: The axial distance EP01 from the eye side surface of the lens barrel to the eye side surface of the first spacer, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy the following conditions: 1 <EP01 / (CT1+CT2)<2。 7. The VR visual system according to claim 1, characterized in that: The outer diameter D0s of the eye side surface of the lens barrel, the inner diameter d0s of the eye side surface of the lens barrel, the maximum length L from the eye 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) / (Lf)<5.

8. The VR visual system according to claim 1, characterized in that: 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 eye side surface of the third lens, and the center thickness CP1 of the first spacing element satisfy the following conditions: <EPD / (T23-CP1)<15。 9. The VR visual system according to claim 1, characterized in that: The outer diameter D0m of the display side surface of the lens barrel, the outer diameter D0s of the eye 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 the following conditions: 12 <D0m / f+D0s / EPD<18。 10. The VR visual system according to claim 1, characterized in that: 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 spacing element, and the center thickness CT3 of the third lens satisfy the following conditions: <d0m / TD+d1m / CT3<7。

Images