Visual system and VR device comprising the same

Abstract

This application discloses a visual system, including a lens barrel and a first element group and a second element group arranged sequentially along the optical axis from a first side to a second side, mounted within the lens barrel. The first element group has positive optical power and includes a reflective polarizing element, a first lens, a quarter-wave plate, and a second lens. The second element group has either positive or negative optical power and includes a third lens. A first spacer element is provided between the first and second lenses, and a second spacer element is provided between the second and third lenses. The effective focal length FG1 of the first element group, the center thickness CT1 of the first lens along the optical axis, the maximum thickness CP1 of the first spacer element along a direction parallel to the optical axis, and the center thickness CT2 of the second lens along the optical axis satisfy: 1.5 <FG1 / (CT1+CP1+CT2)<3。

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical elements, and more particularly to a visual system and a VR device comprising the same. BACKGROUND

[0002] In recent years, with the advent of the concept of "meta universe", people's way of entertainment is becoming more and more rich, among which AR (Augmented Reality) / VR (Virtual Reality) devices and other devices for human-computer interaction are increasingly favored by people. However, there are problems such as large volume and difficult processing in VR lenses.

[0003] In order to solve the above problems, a folding scheme is proposed, and those skilled in the art hope that by improving the design of the VR lens structure, a greater degree of light path folding can be achieved, so as to further compress the thickness of the VR device, make the lens structure more compact and lightweight, and at the same time reasonably ensure the processability of the lens barrel and each lens, improve the assembly yield, and promote the further development and application of VR technology. SUMMARY

[0004] The present application provides a visual system, which can include a lens barrel and a first element group and a second element group arranged in order from a first side to a second side along an optical axis assembled in the lens barrel, wherein the first element group has a positive focal power and includes a reflective polarizing element, a first lens, a quarter-wave plate and a second lens; the second element group has a positive focal power or a negative focal power and includes a third lens; the first lens and the second lens have a first spacing element therebetween, and the second lens and the third lens have a second spacing element therebetween. The effective focal length FG1 of the first element group, the central thickness CT1 of the first lens on the optical axis, the maximum thickness CP1 of the first spacing element along the direction parallel to the optical axis, and the central thickness CT2 of the second lens on the optical axis can satisfy: 1.5 < FG1 / (CT1+CP1+CT2) < 3.

[0005] In one embodiment, the radius of curvature R3 of the first side surface of the second lens, the inner diameter d1s of the first side surface of the first spacing element, and the inner diameter d1m of the second side surface of the first spacing element can satisfy: 1 < |R3| / (d1s+d1m) < 2.5.

[0006] In one embodiment, the distance EP12 of the second side surface of the first spacing element to the first side surface of the second spacing element along the optical axis, the distance T12 of the second side surface of the first lens to the first side surface of the second lens on the optical axis, and the central thickness CTQ of the quarter-wave plate on the optical axis can satisfy: 3.2 < EP12 / (T12+CTQ) < 5.6.

[0007] In one embodiment, the inner diameter d2s of the first side surface of the second spacer element, the outer diameter D2s of the first side surface of the second spacer element, and the radius of curvature R4 of the second side surface of the second lens can satisfy: -4 < (d2s + D2s) / R4 < -2.

[0008] In one embodiment, the inner diameter d0s of the first side end surface of the lens barrel and the entrance pupil diameter EPD of the visual system can satisfy: 10.5 < d0s / EPD < 12.5.

[0009] In one embodiment, the inner diameter d2m of the second side surface of the second spacer element, the outer diameter D2m of the second side surface of the second spacer element, and the radius of curvature R5 of the first side surface of the third lens can satisfy: -3.5 < (d2m + D2m) / R5 < -1.5.

[0010] In one embodiment, the visual system further comprises a lens barrel auxiliary element located between the inner end surface of the lens barrel close to the first side and the first lens, and abutting against the first side surface of the first lens; the radius of curvature R1 of the first side surface of the first lens, the radius of curvature R2 of the second side surface of the first lens, the inner diameter d0bs of the first side surface of the lens barrel auxiliary element, and the inner diameter d0bm of the second side surface of the lens barrel auxiliary element can satisfy: 2 < (R1 x R2) / (d0bs x d0bm) < 4.

[0011] In one embodiment, the effective focal length f of the visual system, the outer diameter D0m of the second side end surface of the lens barrel, and the outer diameter D0s of the first side end surface of the lens barrel can satisfy: 2.2 < f / (D0m - D0s) < 4.2.

[0012] In one embodiment, the visual system further comprises a lens barrel auxiliary element located between the inner end surface of the lens barrel close to the first side and the first lens, and abutting against the first side surface of the first lens; the distance TD of the first side surface of the first lens to the second side surface of the third lens on the optical axis, the maximum thickness CP0b of the lens barrel auxiliary element along the direction parallel to the optical axis, the maximum thickness CP1 of the first spacer element along the direction parallel to the optical axis, and the maximum thickness CP2 of the second spacer element along the direction parallel to the optical axis can satisfy: 7.5 < TD / (CP0b + CP1 + CP2) < 52.5.

[0013] In one embodiment, the outer diameter D1s of the first side surface of the first spacer element, the outer diameter D1m of the second side surface of the first spacer element, and the effective focal length FG1 of the first element group can satisfy: 4 < (D1s + D1m) / FG1 < 5.

[0014] In one embodiment, the distance EP01 from the first side end surface of the lens barrel to the first side surface of the first spacer element along the optical axis, the central thickness CTR of the reflective polarizing element on the optical axis, and the central thickness CT1 of the first lens on the optical axis can satisfy: 2 < EP01 / (CTR+CT1) < 3.5.

[0015] In one embodiment, the visual system further comprises a lens barrel auxiliary element located between the inner end surface of the lens barrel close to the first side and the first lens, and abutting against the first side surface of the first lens; the outer diameter D0bs of the first side surface of the lens barrel auxiliary element, the outer diameter D0bm of the second side surface of the lens barrel auxiliary element, and the curvature radius R6 of the second side surface of the third lens can satisfy: -2.5 < (D0bs+D0bm) / R6 < -2.

[0016] In another aspect, the present application also provides a VR device comprising the visual system provided by at least one of the embodiments described above, wherein the first side is the human eye side, and the second side is the display side.

[0017] The visual system disclosed in the present application comprises a first element group and a second element group arranged in sequence from a first side to a second side along an optical axis in a lens barrel, wherein the first element group has a positive focal power, and comprises a reflective polarizing element, a first lens, a quarter-wave plate, and a second lens; the second element group has a positive focal power or a negative focal power, and comprises a third lens; and a first spacer element is arranged between the first lens and the second lens, and a second spacer element is arranged between the second lens and the third lens; and the effective focal length FG1 of the first element group, the central thickness CT1 of the first lens on the optical axis, the maximum thickness CP1 of the first spacer element along the direction parallel to the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy the condition formula 1.5 < FG1 / (CT1+CP1+CT2) < 3. The arrangement of the visual system disclosed in the present application can control the assembly deformation amount and intensity of the first lens, the first spacer element, and the second lens in the first element group, reduce the tolerance sensitivity of the two lenses, and improve the processability and assembly yield. BRIEF DESCRIPTION OF DRAWINGS

[0018] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0019] Figure 1 The structure and part of the parameters of the visual system according to the exemplary embodiments of the present application are shown in the schematic diagram;

[0020] Figure 2 、 Figure 3 and Figure 4FIGS. 1, 2, and 3 respectively show structural schematic diagrams of the visual system according to Embodiment 1 of the present application in three implementation manners;

[0021] Figure 5 , Figure 6 and Figure 7 FIGS. 6, 7, and 8 respectively show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the visual system of Embodiment 1;

[0022] Figure 8 , Figure 9 and Figure 10 FIGS. 11, 12, and 13 respectively show structural schematic diagrams of the visual system according to Embodiment 2 of the present application in three implementation manners;

[0023] Figure 11 , Figure 12 and Figure 13 FIGS. 16, 17, and 18 respectively show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the visual system of Embodiment 2;

[0024] Figure 14 , Figure 15 and Figure 16 FIGS. 21, 22, and 23 respectively show structural schematic diagrams of the visual system according to Embodiment 3 of the present application in three implementation manners; and

[0025] Figure 17 , Figure 18 and Figure 19 FIGS. 26, 27, and 28 respectively show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the visual system of Embodiment 3. DETAILED DESCRIPTION

[0026] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of exemplary embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression “and / or” includes any and all combinations of one or more of the associated listed items.

[0027] It should be noted that, in the present specification, the expressions first, second, third, and the like are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0028] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical surface or the aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are merely examples and are not drawn strictly to scale.

[0029] In this context, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region.

[0030] It should also be understood that the use of the terms "including", "comprising", "having" and / or "containing" when used in this specification, specifies the presence of stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or groups thereof. Furthermore, as used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. In addition, expressions such as "at least one of...", when preceding a list of two or more items, denote that at least one of each item in the list is present, but does not exclude the presence of all of the items or the addition of one or more items. Furthermore, as used herein, the use of "a" and / or "an" includes singular and plural references unless the context clearly indicates otherwise. Also, as used herein, the use of "or" as a conjunction, permits a full range of equivalents for "either / or" (i.e., exclusive) and "one or the other / both" (i.e., inclusive) options. Moreover, the use of "comprising" and / or "including" serves to include one or more steps, features, elements and / or components not expressly listed, but not to exclude the presence or addition of one or more other steps, features, elements and / or components. Furthermore, as used herein, the use of "if" does not mean "only if" unless specifically so defined by context.

[0031] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0032] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The following embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but can not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] The features, principles, and other aspects of the present application are described in detail below.

[0034] The visual system according to the exemplary embodiments of the present application can include a lens barrel and a lens group assembled in the lens barrel, and the lens group can include a first element group and a second element group arranged in order from a first side to a second side along an optical axis.

[0035] In the exemplary embodiments, the first element group can have a positive refractive power. The first element group can include a reflective polarizing element, a first lens, a quarter wave plate, and a second lens.

[0036] In an example embodiment, the second element group can have positive or negative optical power. The second element group can include a third lens.

[0037] In an example embodiment, the visual system can further include a first spacer element between the first lens and the second lens, and a second spacer element between the second lens and the third lens.

[0038] In an example embodiment, the visual system of the present application can satisfy the condition 1.5 < FG1 / (CT1+CP1+CT2) < 3, where FG1 is the effective focal length of the first element group, CT1 is the center thickness of the first lens along the optical axis, CP1 is the maximum thickness of the first spacer element along the direction parallel to the optical axis, and CT2 is the center thickness of the second lens along the optical axis.

[0039] A visual system according to an example embodiment of the present application includes a first element group and a second element group arranged in sequence from a first side to a second side along an optical axis in a lens barrel, where the first element group has positive optical power and includes a reflective polarizing element, a first lens, a quarter-wave plate, and a second lens; the second element group has positive or negative optical power and includes a third lens; a first spacer element is disposed between the first lens and the second lens, and a second spacer element is disposed between the second lens and the third lens; and the effective focal length FG1 of the first element group, the center thickness CT1 of the first lens along the optical axis, the maximum thickness CP1 of the first spacer element along the direction parallel to the optical axis, and the center thickness CT2 of the second lens along the optical axis satisfy the condition 1.5 < FG1 / (CT1+CP1+CT2) < 3. By such arrangement of the visual system, the assembly deformation amount and strength of the first lens, the first spacer element, and the second lens in the first element group can be controlled, the tolerance sensitivity of the two lenses can be reduced, and the processability and assembly yield can be improved.

[0040] It can be understood that the surface of each element in the visual system of the present application that is closer to the first side and farther from the second side is the first side surface of the element, and the surface of each element that is closer to the second side and farther from the first side is the second side surface of the element.

[0041] In an example embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The visual system can be used, for example, in various VR display devices.

[0042] In the example embodiment, the visual system of the present application can satisfy condition formula 1 <|R3| / (d1s+d1m)<2.5, wherein R3 is the radius of curvature of the first side surface of the second lens, d1s is the inner diameter of the first side surface of the first spacer element, and d1m is the inner diameter of the second side surface of the first spacer element. By controlling the radius of curvature of the first side surface of the second lens, the inner diameter of the first side surface of the first spacer element, and the inner diameter of the second side surface of the first spacer element to satisfy condition formula 1 <|R3| / (d1s+d1m)<2.5, the machinability of the second lens can be ensured, the generation of excessive stray light from the first side surface of the second lens can be avoided, and the imaging effect can be improved.

[0043] In the example embodiment, the visual system of the present application can satisfy condition formula 3.2<EP12 / (T12+CTQ)<5.6, wherein EP12 is the distance along the optical axis from the second side surface of the first spacer element to the first side surface of the second spacer element, T12 is the distance on the optical axis from the second side surface of the first lens to the first side surface of the second lens, and CTQ is the center thickness of the quarter-wave plate on the optical axis. By controlling the distance along the optical axis from the second side surface of the first spacer element to the first side surface of the second spacer element, the distance on the optical axis from the second side surface of the first lens to the first side surface of the second lens, and the center thickness of the quarter-wave plate on the optical axis to satisfy condition formula 3.2<EP12 / (T12+CTQ)<5.6, the problems of excessive thickness of the quarter-wave plate, reduced transmittance, and increased haze can be avoided, thereby ensuring the imaging quality of the entire optical system.

[0044] In the example embodiment, the visual system of the present application can satisfy condition formula -4<(d2s+D2s) / R4<-2, wherein d2s is the inner diameter of the first side surface of the second spacer element, D2s is the outer diameter of the first side surface of the second spacer element, and R4 is the radius of curvature of the second side surface of the second lens. By controlling the inner diameter of the first side surface of the second spacer element, the outer diameter of the first side surface of the second spacer element, and the radius of curvature of the second side surface of the second lens to satisfy condition formula -4<(d2s+D2s) / R4<-2, the size of the second spacer element can be controlled, which can ensure the support range of the second lens, thereby ensuring the assembly yield of the lens, avoid excessive thickness of the second spacer element, and ensure the machinability of the second lens.

[0045] In the example embodiment, the visual system of the present application can satisfy condition formula 10.5<d0s / EPD<12.5, wherein d0s is the inner diameter of the first side end surface of the lens barrel, and EPD is the entrance pupil diameter of the visual system. By controlling the ratio of the inner diameter of the first side end surface of the lens barrel to the entrance pupil diameter of the visual system within the range, the amount of light can be effectively controlled, and the light can be more efficiently utilized for imaging.

[0046] In an exemplary embodiment, the visual system of the present application can satisfy the condition formula -3.5<(d2m+D2m) / R5<-1.5, wherein d2m is the inner diameter of the second side surface of the second spacer element, D2m is the outer diameter of the second side surface of the second spacer element, and R5 is the radius of curvature of the first side surface of the third lens. By controlling the inner diameter of the second side surface of the second spacer element, the outer diameter of the second side surface of the second spacer element, and the radius of curvature of the first side surface of the third lens to satisfy the condition formula -3.5<(d2m+D2m) / R5<-1.5, the outer size of the second spacer element can be controlled, which can not only ensure its support range for the third lens to ensure the assembly yield of the lens, but also avoid too thin thickness which is difficult to process, and at the same time, is beneficial to ensure the processability of the third lens.

[0047] In an exemplary embodiment, the visual system of the present application can further include a lens barrel auxiliary element, which is located between the inner end surface of the lens barrel close to the first side (i.e. the end surface of the lens barrel closest to the first side inside the lens barrel) and the first lens, and abuts against the first side surface of the first lens.

[0048] In an exemplary embodiment, the visual system of the present application can satisfy the condition formula 2<(R1×R2) / (d0bs×d0bm)<4, wherein R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, d0bs is the inner diameter of the first side surface of the lens barrel auxiliary element, and d0bm is the inner diameter of the second side surface of the lens barrel auxiliary element. By controlling the radius of curvature of the first side surface of the first lens, the radius of curvature of the second side surface of the first lens, the inner diameter of the first side surface of the lens barrel auxiliary element, and the inner diameter of the second side surface of the lens barrel auxiliary element to satisfy the condition formula 2<(R1×R2) / (d0bs×d0bm)<4, the radius of curvature of the far light surface (first side surface) and the near light surface (second side surface) of the first lens can be reasonably controlled, which is beneficial to correct the off-axis aberration on the one hand, and can avoid stray light reflected from the lens barrel mechanism to the first lens, and improve the overall image quality of the system on the other hand.

[0049] In an exemplary embodiment, the visual system of the present application can satisfy the condition formula 2.2<f / (D0m-D0s)<4.2, wherein f is the effective focal length of the visual system, D0m is the outer diameter of the second side end surface of the lens barrel (i.e. the end surface or surface of the lens barrel closest to the second side), and D0s is the outer diameter of the first side end surface of the lens barrel (i.e. the end surface or surface of the lens barrel closest to the first side). By controlling the effective focal length of the visual system, the outer diameter of the second side end surface of the lens barrel, and the outer diameter of the first side end surface of the lens barrel to satisfy the condition formula 2.2<f / (D0m-D0s)<4.2, the outer size of the lens barrel can be reasonably controlled, which can ensure smooth transition of the first side surface of the lens barrel to the second side surface, avoid too large processing difficulty of the lens barrel, and at the same time, is beneficial to improve the assembly yield of the lens.

[0050] In the exemplary embodiments, the visual system of the present application can satisfy the condition formula 7.5 < TD / (CP0b+CP1+CP2) < 52.5, where TD is the distance from the first side of the first lens to the second side of the third lens on the optical axis, CP0b is the maximum thickness of the barrel auxiliary element along the direction parallel to the optical axis, CP1 is the maximum thickness of the first spacer element along the direction parallel to the optical axis, and CP2 is the maximum thickness of the second spacer element along the direction parallel to the optical axis. By controlling the distance from the first side of the first lens to the second side of the third lens on the optical axis, the maximum thickness of the barrel auxiliary element along the direction parallel to the optical axis, the maximum thickness of the first spacer element along the direction parallel to the optical axis, and the maximum thickness of the second spacer element along the direction parallel to the optical axis to satisfy the condition formula 7.5 < TD / (CP0b+CP1+CP2) < 52.5, the thicknesses of the respective elements are reasonably distributed, which can not only compress the thickness of the entire machine as much as possible to ensure the user experience of the entire machine, but also maintain the reasonableness of the thicknesses of the barrel auxiliary element, the first spacer element, and the second spacer element to ensure their processability.

[0051] In the exemplary embodiments, the visual system of the present application can satisfy the condition formula 4 < (D1s+D1m) / FG1 < 5, where D1s is the outer diameter of the first side of the first spacer element, D1m is the outer diameter of the second side of the first spacer element, and FG1 is the effective focal length of the first element group. By controlling the outer diameter of the first side of the first spacer element, the outer diameter of the second side of the first spacer element, and the effective focal length of the first element group to satisfy the condition formula 4 < (D1s+D1m) / FG1 < 5, the light path in the first lens and the second lens is controlled, the sensitivity of the first lens and the second lens is reduced, the excessively smoothness of the first side surface and the second side surface of the first spacer element is further ensured, the processability of the first spacer element is ensured, and the assembly yield is improved.

[0052] In the exemplary embodiments, the visual system of the present application can satisfy the condition formula 2 < EP01 / (CTR+CT1) < 3.5, where EP01 is the distance from the first side end surface of the barrel to the first side of the first spacer element along the optical axis, CTR is the central thickness of the reflective polarizing element on the optical axis, and CT1 is the central thickness of the first lens on the optical axis. By controlling the distance from the first side end surface of the barrel to the first side of the first spacer element along the optical axis, the central thickness of the reflective polarizing element on the optical axis, and the central thickness of the first lens on the optical axis to satisfy the condition formula 2 < EP01 / (CTR+CT1) < 3.5, the field curvature of the system is ensured, the assembly yield of the lens is improved, and the processability of the first lens is further ensured.

[0053] In an exemplary embodiment, the visual system of the present application can satisfy the condition formula -2.5<(D0bs+D0bm) / R6<-2, where D0bs is the outer diameter of the first side surface of the barrel auxiliary element, D0bm is the outer diameter of the second side surface of the barrel auxiliary element, and R6 is the curvature radius of the second side surface of the third lens. By controlling the outer diameter of the first side surface of the barrel auxiliary element, the outer diameter of the second side surface of the barrel auxiliary element, and the curvature radius of the second side surface of the third lens to satisfy the condition formula -2.5<(D0bs+D0bm) / R6<-2, on the one hand, it is beneficial to light divergence, and on the other hand, it is beneficial to the processing and assembly of the barrel auxiliary element.

[0054] In an exemplary embodiment, the visual system of the present application can include at least one diaphragm. The diaphragm can constrain the light path and control the light intensity. The diaphragm can be arranged at a suitable position of the visual system as needed, for example, the diaphragm can be arranged between the first side (human eye side) and the first lens.

[0055] In an exemplary embodiment, the visual system described above can also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0056] According to the visual system of the above-mentioned embodiments of the present application, by arranging the first element group and the second element group in the barrel in sequence from the first side to the second side along the optical axis, wherein the first element group has positive focal power and includes a reflective polarizing element, a first lens, a quarter-wave plate, and a second lens; the second element group has positive focal power or negative focal power and includes a third lens; and a first spacing element is arranged between the first lens and the second lens, and a second spacing element is arranged between the second lens and the third lens; and at the same time, the effective focal length FG1 of the first element group, the central thickness CT1 of the first lens in the optical axis, the maximum thickness CP1 of the first spacing element in the direction parallel to the optical axis, and the central thickness CT2 of the second lens in the optical axis satisfy the condition formula 1.5<FG1 / (CT1+CP1+CT2)<3. The assembly deformation amount and intensity of the first lens, the first spacing element, and the second lens in the first element group can be controlled, the tolerance sensitivity of the two lenses is reduced, and the processability and assembly yield are improved.

[0057] According to the visual system of the embodiments of the present application, by designing a three-piece folding scheme and using reasonable film layer settings, a greater degree of light path folding can be achieved, thereby further compressing the thickness of the VR device; at the same time, the imaging quality can also be improved, which is beneficial to the improvement of user experience.

[0058] The specific embodiments of the visual system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0059] Example 1

[0060] The visual system according to Embodiment 1 of the present application is described below with reference to Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 6 and Figure 7 . Figure 2 , Figure 3 and Figure 4 respectively show the structural schematic diagram of the visual system according to Embodiment 1 of the present application under three different embodiments (Embodiment 1-1, Embodiment 1-2, Embodiment 1-3).

[0061] As shown in Figure 2 , Figure 3 and Figure 4 , the visual system comprises a lens barrel P0 and, assembled in the lens barrel P0, arranged in order along the optical axis from the first side (the side of the human eye) to the second side (the side of the display): a reflective polarizing element RP, a first lens E1, a quarter-wave plate QWP, a second lens E2 and a third lens E3; the visual system further comprises an image plane IMG located at the second side.

[0062] In this embodiment, the reflective polarizing element RP, the first lens E1, the quarter-wave plate QWP and the second lens E2 can constitute a first element group, specifically, the second side surface (the surface close to the display side, away from the human eye side) of the reflective polarizing element RP can be attached to the first side surface (the surface close to the human eye side, away from the display side) of the first lens E1, and the second side surface (the surface close to the display side, away from the human eye side) of the quarter-wave plate QWP can be attached to the first side surface (the surface close to the human eye side, away from the display side) of the second lens E2. The first element group has a positive focal power.

[0063] In this embodiment, the second element group comprises the third lens E3.

[0064] In this embodiment, the visual system further comprises: a lens barrel auxiliary element P0b between the inner end surface (i.e. the end surface inside the lens barrel closest to the first side) of the lens barrel P0 close to the first side and the first lens E1, and the lens barrel auxiliary element P0b abuts against the first side surface of the first lens E1; a first spacing element P1 between the first lens E1 and the second lens E2; and a second spacing element P2 between the second lens E2 and the third lens E3.

[0065] Table 1 shows the basic parameters of the visual system of Embodiment 1, wherein the units of the radius of curvature and the thickness / distance are millimeters (mm).

[0066] Surface Surface type Radius of curvature Thickness / distance Refractive index Abbe number Refractive / reflective Conic constant S0 Sphere Infinite Infinite Refractive S1 Sphere Infinite 18.5927 Refractive S2 Aspheric -71.7746 0.2000 1.50 57.00 Refractive S3 Aspheric -71.7746 1.9700 1.60 26.13 Refractive 0.0000 S4 Aspheric -95.9737 0.1000 Refractive 0.0000 S5 Aspheric -140.7247 0.3000 1.50 57.00 Refractive S6 Aspheric -140.7247 11.2197 1.56 46.39 Refractive 0.0000 S7 Aspheric -40.0554 0.1000 Refractive 0.0000 S8 Aspheric -42.1444 2.0000 1.64 21.46 Refractive 0.0000 S9 Aspheric -56.3156 -2.0000 1.64 21.46 Reflective 0.0000 S10 Aspheric -42.1444 -0.1000 Refractive S11 Aspheric -40.0554 -11.2197 1.56 46.39 Refractive S12 Aspheric -140.7247 -0.3000 1.50 57.00 Refractive S13 Aspheric -140.7247 -0.1000 Refractive S14 Aspheric -95.9737 -1.9700 1.60 26.13 Refractive S15 Aspheric -71.7746 1.9700 1.60 26.13 Reflective S16 Aspheric -95.9737 0.1000 Refractive S17 Aspheric -140.7247 0.3000 1.50 57.00 Refractive S18 Aspheric -140.7247 11.2197 1.56 46.39 Refractive S19 Aspheric -40.0554 0.1000 Refractive S20 Aspheric -42.1444 2.0000 1.64 21.46 Refractive S21 Sphere -56.3156 5.3777 Infinite S22 Refractive Coefficient\surface 0.0000 Figure 2

[0067] Table 1

[0068] In Embodiment 1, each of the surfaces S2 to S21 is an aspherical surface, and each aspherical surface profile x can be defined by, but not limited to, the following aspherical surface formula:

[0069]

[0070] where x is the sag of the aspherical surface at a height h along the optical axis from the vertex of the aspherical surface, c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the curvature radius R in Table 1 above), k is the conic constant, and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below provides the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30, A32, A34, A36, A38, A40, A42, A44, A46, A48, A50, A52, A54, A56, A58, A60, A62, A64, A66, A68, A70, A72, A74, A76, A78, A80, A82, A84, A86, A88, A90, A92, A94, A96, A98, and A100 that can be used for each of the aspherical surfaces S3, S4, S6 to S9 in Embodiment 1. 10 12 14 16 18 20 .

[0071] Figure 3 S3 S4 S6 S7 S8 S9 A4 -3.9844E-02 -1.5037E-01 2.5695E-01 5.9157E-02 -1.4120E-01 -2.9627E-02 A6 1.1446E-01 -2.1338E-01 1.3168E-02 2.5578E-01 -2.0257E-01 -1.6513E-03 A8 -2.8323E-02 1.3476E-01 7.5666E-02 -9.2370E-02 1.2953E-01 -1.2735E-02 A10 -4.4345E-03 -2.4579E-03 -3.4733E-02 -5.1424E-03 8.8666E-03 1.4788E-02 A12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A16 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0072] Table 2

[0073] The relevant parameter values in this embodiment are shown in Table 7, respectively, in combination with Figure 4 , Figure 1 , Figure 5 and Figure 6 ​​​​​wherein, dls is the inner diameter of the first side surface of the first spacer element P1; dlm is the inner diameter of the second side surface of the first spacer element P1; Dls is the outer diameter of the first side surface of the first spacer element P1; Dlm is the outer diameter of the second side surface of the first spacer element P1; d2s is the inner diameter of the first side surface of the second spacer element P2; d2m is the inner diameter of the second side surface of the second spacer element P2; D2s is the outer diameter of the first side surface of the second spacer element P2; D2m is the outer diameter of the second side surface of the second spacer element P2; d0s is the inner diameter of the first side end surface of the lens barrel P0; D0s is the outer diameter of the first side end surface of the lens barrel P0; D0m is the outer diameter of the second side end surface of the lens barrel P0; EP01 is the distance from the first side end surface of the lens barrel P0 to the first side surface of the first spacer element P1 along the optical axis; CP1 is the maximum thickness of the first spacer element P1 along the direction parallel to the optical axis; EP12 is the distance from the second side surface of the first spacer element P1 to the first side surface of the second spacer element P2 along the optical axis; CP2 is the maximum thickness of the second spacer element P2 along the direction parallel to the optical axis; d0bs is the inner diameter of the first side surface of the lens barrel auxiliary element P0b; d0bm is the inner diameter of the second side surface of the lens barrel auxiliary element P0b; D0bs is the outer diameter of the first side surface of the lens barrel auxiliary element P0b; D0bm is the outer diameter of the second side surface of the lens barrel auxiliary element P0b; and CP0b is the maximum thickness of the lens barrel auxiliary element P0b along the direction parallel to the optical axis. The units of the above parameters shown in Table 7 are millimeters (mm).

[0074] Figure 7 The on-axis chromatic aberration curve of the visual system of Embodiment 1 is shown, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Figure 5 to Figure 7 The astigmatism curve of the visual system of Embodiment 1 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Example 2 The distortion curve of the visual system of Embodiment 1 is shown, which represents the distortion size values corresponding to different field angles. According to the distortion curve, the distortion size values of the visual system of Embodiment 1 are less than 0.1% at different field angles. Figure 8 It can be seen that the visual system given in Embodiment 1 can achieve good imaging quality.

[0075] Figure 9

[0076] The visual system according to Embodiment 2 of the present application is described below with reference to Figure 10 , Figure 11 , Figure 12 and Figure 13 , Figure 8 and Figure 9 . In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 10 , Figure 8 and Figure 9Figures 1A, 1B and 1C respectively show the structural schematic diagrams of the visual system according to Embodiment 2 of the present application in three different embodiments (Embodiment 2-1, Embodiment 2-2, Embodiment 2-3).

[0077] As shown in Figure 10 , Coefficient\surface and Figure 11 , the visual system comprises a lens barrel P0 and, assembled in the lens barrel P0, arranged in order along the optical axis from the first side (the human eye side) to the second side (the display side): a reflective polarizing element RP, a first lens E1, a quarter-wave plate QWP, a second lens E2 and a third lens E3; the visual system further comprises an image plane IMG located at the second side.

[0078] In this embodiment, the reflective polarizing element RP, the first lens E1, the quarter-wave plate QWP and the second lens E2 can constitute a first element group, specifically, the second side surface (the surface close to the display side, away from the human eye side) of the reflective polarizing element RP can be attached to the first side surface (the surface close to the human eye side, away from the display side) of the first lens E1, and the second side surface (the surface close to the display side, away from the human eye side) of the quarter-wave plate QWP can be attached to the first side surface (the surface close to the human eye side, away from the display side) of the second lens E2. The first element group has a positive refractive power.

[0079] In this embodiment, the second element group comprises the third lens E3.

[0080] In this embodiment, the visual system further comprises: a lens barrel auxiliary element P0b located between the inner end surface close to the first side of the lens barrel P0 and the first lens E1, and abutting against the first side surface of the first lens E1; a first spacing element P1 located between the first lens E1 and the second lens E2; and a second spacing element P2 located between the second lens E2 and the third lens E3.

[0081] Table 3 shows the basic parameters of the visual system of Embodiment 2, wherein the units of the curvature radius and the thickness / distance are millimeters (mm). In this embodiment, the surfaces S2 to S21 are all aspherical surfaces, and Table 4 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 and A22 of the aspherical surfaces S3, S4, S6 to S9 which can be used in Embodiment 2, wherein each aspherical surface can be defined by the formula (1) given in Embodiment 1 above. 10 12 14 16 18 20

[0082]

[0083] ​​​​​​

[0084] Table 3

[0085] Figure 12 S3 S4 S6 S7 S8 S9 A4 -8.4010E-02 -7.8546E-02 1.9036E-01 -2.1572E-02 5.2745E-02 -1.3152E-01 A6 2.2228E-01 1.1684E-02 1.6292E-01 2.4958E-01 -2.4073E-01 1.4465E-01 A8 -2.7025E-02 -4.2279E-02 1.1215E-01 3.7177E-02 5.8821E-02 -2.5503E-02 A10 -2.2199E-03 8.6666E-02 6.9469E-02 5.8298E-02 8.0173E-02 -2.5179E-03 A12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A16 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0086] Table 4

[0087] The values of the relevant parameters in Example 2 are shown in Table 7, respectively, where the meanings of the parameters are as described above and will not be repeated here, and the units of the parameters shown in Table 7 are millimeters (mm).

[0088] Figure 13 The on-axis chromatic aberration curve of the visual system of Example 2 is shown, which represents the deviation of the convergent focus point of light rays of different wavelengths after passing through the lens. Figure 11 to Figure 13 The astigmatism curve of the visual system of Example 2 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Example 3 The distortion curve of the visual system of Example 2 is shown, which represents the distortion size values corresponding to different field angles. According to the distortion curve, it can be seen that the distortion of the visual system of Example 2 is small. Figure 14 It can be seen that the visual system given in Example 2 can achieve good imaging quality.

[0089] Figure 15

[0090] The visual system according to Example 3 of the present application is described below with reference to Figure 16 , Figure 17 , Figure 18 and Figure 19 , Figure 14 and Figure 15 . Figure 16 , Figure 14 and Figure 15 respectively show the structural schematic diagrams of the visual system according to Example 3 of the present application in three different embodiments (Embodiment 3-1, Embodiment 3-2, Embodiment 3-3).

[0091] As shown in Figure 16 , Surface and Surface type , the visual system comprises a lens barrel P0 and, arranged in the lens barrel P0 in order from a first side (an eye side) to a second side (a display side) along an optical axis: a reflective polarizing element RP, a first lens E1, a quarter-wave plate QWP, a second lens E2 and a third lens E3; the visual system further comprises an image plane IMG located at the second side.

[0092] In this embodiment, the reflective polarizing element RP, the first lens E1, the quarter-wave plate QWP, and the second lens E2 can constitute a first element group. Specifically, the second side surface of the reflective polarizing element RP (the surface closer to the display and farther from the human eye) can be attached to the first side surface of the first lens E1 (the surface closer to the human eye and farther from the display), and the second side surface of the quarter-wave plate QWP (the surface closer to the display and farther from the human eye) can be attached to the first side surface of the second lens E2 (the surface closer to the human eye and farther from the display). The first element group has positive optical power.

[0093] In this embodiment, the second element group includes a third lens E3.

[0094] In this embodiment, the visual system further includes: a lens barrel auxiliary element P0b located between the inner end face of the lens barrel P0 near the first side and the first lens E1, and the lens barrel auxiliary element P0b abutting against the first side surface of the first lens E1; a first spacer element P1 located between the first lens E1 and the second lens E2; and a second spacer element P2 located between the second lens E2 and the third lens E3.

[0095] Table 5 shows the basic parameters of the visual system of Example 3, where the units for radius of curvature and thickness / distance are millimeters (mm). In this example, surfaces S2 to S21 are all aspherical surfaces. Table 6 shows the higher-order coefficients A4, A6, A8, A9 of the aspherical surfaces S3, S4, S6 to S9 that can be used in Example 3. 10 A 12 A 14 A 16 A 18 and A 20 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0096] Radius of curvature Thickness / distance Refractive index Abbe number Refractive / reflective Conic constant Sphere Infinite S0 Infinite Refractive Sphere Infinite S1 Refractive Aspheric 18.5927 Refractive S2 Aspheric -71.7746 0.2000 1.60 26.13 Refractive S3 Aspheric -71.7746 1.9700 1.60 26.13 Refractive 0.0000 S4 Aspheric -95.9737 0.1000 Refractive 0.0000 S5 Aspheric -140.7247 0.2000 1.50 57.00 Refractive S6 Aspheric -140.7247 11.3197 1.56 46.39 Refractive 0.0000 S7 Aspheric -40.0554 0.1000 Refractive 0.0000 S8 Aspheric -42.1444 2.0000 1.64 21.46 Reflective 0.0000 S9 Aspheric -56.3156 -2.0000 1.64 21.46 Refractive 0.0000 S10 Aspheric -42.1444 -0.1000 Refractive S11 Aspheric -40.0554 -11.3197 1.56 46.39 Refractive S12 Aspheric -140.7247 -0.2000 1.50 57.00 Refractive S13 Aspheric -140.7247 -0.1000 Refractive S14 Aspheric -95.9737 -1.9700 1.60 26.13 Reflective S15 Aspheric -71.7746 1.9700 1.60 26.13 Refractive S16 Aspheric -95.9737 0.1000 Refractive S17 Aspheric -140.7247 0.2000 1.50 57.00 Refractive S18 Aspheric -140.7247 11.3197 1.56 46.39 Refractive S19 Aspheric -40.0554 0.1000 Refractive S20 Sphere -42.1444 2.0000 1.64 21.46 Infinite S21 Refractive -56.3156 5.3828 Figure 17 S22 Figure 18 Figure 19 0.0000 Figure 17 to Figure 19

[0097] Table 5

[0098]

[0099]

[0100] Table 6

[0101] The relevant parameter values ​​in Example 3 are shown in Table 7. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter in Table 7 is millimeters (mm).

[0102] Parameter / exampleThe on-axis chromatic aberration curve of the visual system of Embodiment 3 is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the lens. d1s The astigmatic curves of the visual system of Embodiment 3 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. d1m The distortion curves of the visual system in Example 3 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... D1s It can be seen that the visual system given in Example 3 can achieve good imaging quality.

[0103] D1m 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 d2s 59.4580 58.4767 59.4580 59.8046 59.8589 59.8046 60.5125 58.4455 60.5125 d2m 59.4580 59.4318 59.4580 59.8046 60.2140 59.8046 60.5125 58.8006 60.5125 D2s 65.5815 65.0429 65.5815 65.8197 64.4252 65.8197 65.5045 63.0118 65.5045 D2m 65.5815 64.9981 65.5815 65.8197 64.9803 65.8197 65.5045 63.5669 65.5045 d0s 59.5674 59.5674 59.5668 59.8051 59.8051 59.8057 58.8905 58.8905 58.8893 D0s 59.5674 59.5674 59.5668 59.8046 59.8051 59.8057 58.8905 58.8905 58.8893 D0m 67.6841 67.6841 67.6841 59.8057 67.4959 67.2959 67.8084 66.8084 67.8084 EP01 67.6841 67.6841 67.6841 59.8057 67.4959 67.2959 67.8084 66.8084 67.8084 CP1 55.0162 59.9170 55.4071 55.7926 60.0934 55.7926 54.6006 58.6800 54.6006 EP12 60.5483 64.9758 60.5558 60.3339 65.1521 60.3339 60.2248 63.7387 60.2248 CP2 73.3691 73.3691 73.3691 72.1063 72.1063 72.1063 72.9187 72.9187 72.9187 d0bs 5.8850 5.2572 5.8329 7.0965 5.7380 7.0965 5.4864 4.9380 5.6014 d0bm 0.1000 0.8278 0.1000 0.1000 1.6084 0.1000 0.1000 1.6084 0.1000 D0bs 2.3292 2.3292 2.3292 1.8704 1.8704 1.8704 2.7204 2.0506 2.4611 D0bm 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000 CP0b 53.7271 57.7271 54.1180 54.5035 57.9035 55.4753 53.7778 56.4901 53.7778 Parameter / example 53.7271 57.7271 54.1180 54.5035 57.9035 55.4753 53.7778 56.4901 53.7778 FG1 (mm) 59.8506 63.8506 60.1766 60.6328 64.0328 60.6328 58.9608 62.4194 59.1608 f (mm) 59.8506 63.8506 60.1766 60.6328 64.0328 60.6328 58.9608 62.4194 59.1608 EPD (mm) 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000

[0104] Table 7

[0105] Furthermore, in Examples 1 to 3, the effective focal length FG1 of the first element group, the effective focal length f of the visual system, the entrance pupil diameter EPD of the visual system, the distance TD from the first side of the first lens to the second side of the third lens along the optical axis, the center thickness CTR of the reflective polarizing element on the optical axis, and the center thickness CTQ of the quarter-wave plate on the optical axis are shown in Table 8.

[0106] TD (mm) 1 2 3 CTR (mm) 27.34 27.92 27.34 CTQ (mm) 28.43 28.44 28.43 ​ 5.00 5.00 5.00 ​ 15.69 14.27 15.69 ​ 0.20 0.20 0.20 ​ 0.30 0.20 0.20

[0107] Table 8 shows that Examples 1 to 3 satisfy the conditions shown in Table 9.

[0108]

[0109]

[0110] Table 9

[0111] This application also provides an imaging device equipped with an electronic photosensitive element for imaging. The electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. This imaging device is equipped with the visual system described above.

[0112] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of protection involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the concept of this application. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A visual system, characterized in that, It includes a lens barrel and a first element group and a second element group arranged sequentially from the first side to the second side along the optical axis, assembled within the lens barrel, wherein, The first element group has positive optical power and includes a reflective polarizing element, a first lens, a quarter-wave plate, and a second lens; The second element group has positive or negative optical power and includes a third lens; The first lens has negative optical power, and its first side surface is concave and its second side surface is convex. The second lens has positive optical power, and its first side surface is concave and its second side surface is convex. The first side of the third lens is concave, and the second side is convex. The number of lenses with optical power in the visual system is three; The reflective polarizing element is disposed on the first side of the first lens; The quarter-wave plate is disposed on the first side of the second lens; The visual system also includes a portion of a reflective element disposed on the second side surface of the third lens; The first side is the eye side, and the second side is the display side; A first spacer element is provided between the first lens and the second lens, and a second spacer element is provided between the second lens and the third lens; The visual system satisfies: 1.84≤FG1 / (CT1+CP1+CT2)≤2.82, 3.33≤EP12 / (T12+CTQ)≤5.44 and 2.28≤EP01 / (CTR+CT1)≤3.27, Wherein, FG1 is the effective focal length of the first element group, CT1 is the center thickness of the first lens on the optical axis, CP1 is the maximum thickness of the first spacer element along the direction parallel to the optical axis, CT2 is the center thickness of the second lens on the optical axis, EP12 is the distance from the second side of the first spacer element to the first side of the second spacer element along the optical axis, T12 is the distance from the second side of the first lens to the first side of the second lens on the optical axis, CTQ is the center thickness of the quarter-wave plate on the optical axis, EP01 is the distance from the first side end face of the lens barrel to the first side face of the first spacer element along the optical axis, and CTR is the center thickness of the reflective polarizing element on the optical axis.

2. The visual system according to claim 1, characterized in that, The radius of curvature R3 of the first side surface of the second lens, the inner diameter d1s of the first side surface of the first spacer element, and the inner diameter d1m of the second side surface of the first spacer element satisfy the following: 1.16≤|R3| / (d1s+d1m)≤2.

24.

3. The visual system according to claim 1, characterized in that, The inner diameter d2s of the first side of the second spacer element, the outer diameter D2s of the first side of the second spacer element, and the radius of curvature R4 of the second side of the second lens satisfy the following: -3.18≤(d2s+D2s) / R4≤-2.

08.

4. The visual system according to claim 1, characterized in that, The inner diameter d0s of the first side end face of the lens barrel and the entrance pupil diameter EPD of the visual system satisfy the following: 10.92≤d0s / EPD≤12.

02.

5. The visual system according to claim 1, characterized in that, The inner diameter d2m of the second side of the second spacer element, the outer diameter D2m of the second side of the second spacer element, and the radius of curvature R5 of the first side of the third lens satisfy the following: -3.02≤(d2m+D2m) / R5≤-1.

93.

6. The visual system according to any one of claims 1 to 5, characterized in that, The visual system also includes a lens barrel auxiliary element, located between the inner end face of the lens barrel near the first side and the first lens, and abutting against the first side surface of the first lens; The radius of curvature R1 of the first side surface of the first lens, the radius of curvature R2 of the second side surface of the first lens, the inner diameter d0bs of the first side surface of the lens barrel auxiliary element, and the inner diameter d0bm of the second side surface of the lens barrel auxiliary element satisfy the following: 2.07≤(R1×R2) / (d0bs×d0bm)≤3.

55.

7. The visual system according to any one of claims 1 to 5, characterized in that, The effective focal length f of the visual system, the outer diameter D0m of the second side end face of the lens barrel, and the outer diameter D0s of the first side end face of the lens barrel satisfy the following: 2.2 <f / (D0m-D0s)≤4.09。 8. The visual system according to any one of claims 1 to 5, characterized in that, The visual system also includes a lens barrel auxiliary element, located between the inner end face of the lens barrel near the first side and the first lens, and abutting against the first side surface of the first lens; The distance TD between the first side surface of the first lens and the second side surface of the third lens on the optical axis, the maximum thickness CP0b of the lens barrel auxiliary element along the direction parallel to the optical axis, and the maximum thickness CP2 of the second spacer element along the direction parallel to the optical axis satisfy the following: 7.89≤TD / (CP0b+CP1+CP2)≤52.

30.

9. The visual system according to any one of claims 1 to 5, characterized in that, The outer diameter D1s of the first side of the first spacer element and the outer diameter D1m of the second side of the first spacer element satisfy: 4.63≤(D1s+D1m) / FG1≤4.

80.

10. The visual system according to any one of claims 1 to 5, characterized in that, The visual system also includes a lens barrel auxiliary element, located between the inner end face of the lens barrel near the first side and the first lens, and abutting against the first side surface of the first lens; The outer diameter D0bs of the first side of the lens barrel auxiliary element, the outer diameter D0bm of the second side of the lens barrel auxiliary element, and the radius of curvature R6 of the second side of the third lens satisfy the following: -2.27≤(D0bs+D0bm) / R6≤-2.

07.

11. A VR device comprising a visual system as claimed in any one of claims 1 to 10.

Images