Visual system and VR device comprising the same

Abstract

The application discloses a visual system, comprising a lens barrel and 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 the lens barrel, wherein the first element group has positive focal power and comprises a reflective polarizing element, a first lens and a second lens; the second element group has positive focal power or negative focal power and comprises a third lens; 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. An effective focal length FG1 of the first element group, an outer diameter D1s of a first side surface of the first spacing element and an inner diameter d1s of the first side surface of the first spacing element satisfy 3<FG1 / (D1s-d1s)<6.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to a visual system and a VR device including the visual system. Background Technology

[0002] Since the concept of the "metaverse" was proposed, AR (Augmented Reality) / VR (Virtual Reality) has ushered in a second opportunity for development. As the entry point for human-computer interaction, VR imaging lenses play a crucial role. On the one hand, the image quality of VR imaging lenses needs to meet the resolution requirements of the human eye; on the other hand, early aspherical or Fresnel lenses were relatively long, resulting in a forward-biased device center of gravity and a poor user experience, which urgently needed improvement.

[0003] Based on the above requirements, a folding-back solution was proposed. By folding the optical path, the length of the lens can be significantly compressed, for example, to half its original length, thereby shifting the center of gravity of the display device backward and improving the user experience. Currently, VR devices based on optical path folding have been released; however, from a user experience perspective, the outer field of view is relatively blurry, and the imaging quality of two-element lenses needs improvement. In addition, stray light between the lenses also seriously affects the system's imaging quality.

[0004] Therefore, based on the current state of development, those skilled in the art hope to further reduce the height of the device and improve the imaging quality through design improvements, so as to provide consumers with a better immersive experience and promote the further development and application of VR technology. Summary of the Invention

[0005] This application provides a visual system, which may include 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 within the lens barrel. The first element group has positive optical power and includes a reflective polarizing element, a first lens, and a second lens. The second element group has positive or negative optical power and includes a third lens. 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 effective focal length FG1 of the first element group, the outer diameter D1s of the first side of the first spacer element, and the inner diameter d1s of the first side of the first spacer element can satisfy: 3 <FG1 / (D1s-d1s)<6。

[0006] In one embodiment, the distance EP01 from the first side end face of the lens barrel to the first side face of the first spacer element along the optical axis, the maximum thickness CP1 of the first spacer element along the direction parallel to the optical axis, the center thickness CTR of the reflective polarizing element on the optical axis, and the center thickness CT1 of the first lens on the optical axis can satisfy: 1.5 < (EP01 + CP1) / (CTR + CT1) < 3.5.

[0007] In one embodiment, the effective focal length FG2 of the second element group, the inner diameter d2m of the second side of the second spacer element, and the outer diameter D2m of the second side of the second spacer element can satisfy: 0.5 < |FG2| / (d2m+D2m) < 9.5.

[0008] In one embodiment, the radius of curvature R1 of the first side surface of the first lens and the inner diameter d0s of the first side end face of the lens barrel can satisfy: -3.5 <R1 / d0s<-0.5。

[0009] In one embodiment, the radius of curvature R2 of the second side surface of the first lens, the radius of curvature R3 of the first side surface of the second lens, the inner diameter d1m of the second side surface of the first spacer element, and the outer diameter D1m of the second side surface of the first spacer element can satisfy: 1.5 < (R2 × R3) / (d1m × D1m) < 6.

[0010] In one embodiment, the distance L from the first side end face of the lens barrel to the second side end face of the lens barrel along the optical axis, and the distance TD from the first side surface of the first lens to the second side surface of the third lens along the optical axis, can satisfy: 0.6 <L / TD<1.6。

[0011] In one embodiment, the center thickness CT2 of the second lens on the optical axis, the distance T23 from the second side of the second lens to the first side of the third lens along the optical axis, the distance EP12 from the second side of the first spacer element to the first side of the second spacer element along the optical axis, and the maximum thickness CP2 of the second spacer element along the direction parallel to the optical axis can satisfy: 2.1 < (CT2 + T23) / (EP12 + CP2) < 4.7.

[0012] In one embodiment, the visual system further 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, wherein the inner diameter d0bs of the first side surface of the lens barrel auxiliary element, the inner diameter d0bm of the second side surface of the lens barrel auxiliary element and the effective focal length f of the visual system can satisfy: 3.3 < (d0bs + d0bm) / f < 4.3.

[0013] In one embodiment, the outer diameter D0s of the first side end face of the lens barrel and the entrance pupil diameter EPD of the visual system may satisfy: 11.2 < D0s / EPD < 13.2.

[0014] In one embodiment, the first element group further includes: a quarter-wave plate, located on the first side or the second side of the second lens, 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, the central thickness CTR of the reflective polarizing element on the optical axis, and the central thickness CTQ of the quarter-wave plate on the optical axis may satisfy: 0.3 < (CP0b + CP1) / (CTR + CTQ) < 7.8.

[0015] In one embodiment, the radius of curvature R4 of the second side of the second lens, the radius of curvature R5 of the first side of the third lens, the inner diameter d2s of the first side of the second spacer element, and the outer diameter D2s of the first side of the second spacer element may satisfy: 0.4 < (R4 × R5) / (d2s × D2s) < 1.6.

[0016] In one embodiment, the outer diameter D0m of the second side end face of the lens barrel, the inner diameter d0m of the second side end face of the lens barrel, and the central thickness CT3 of the third lens on the optical axis may satisfy: 1 < (D0m - d0m) / CT3 < 1.5.

[0017] On the other hand, the present application further provides a VR device, which includes the visual system provided by at least one of the above various embodiments, wherein the first side is the human eye side and the second side is the display side.

[0018] The visual system disclosed in the present application includes a first element group and a second element group that are sequentially arranged along the optical axis from the first side to the second side and assembled in a lens barrel. Among them, the first element group has a positive optical power and includes a reflective polarizing element, a first lens, and a second lens; the second element group has a positive optical power or a negative optical power and includes a third lens; and 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; at the same time, the effective focal length FG1 of the first element group, the outer diameter D1s of the first side of the first spacer element, and the inner diameter d1s of the first side of the first spacer element are controlled to satisfy the conditional formula 3 < FG1 / (D1s - d1s) < 6. This setting of the visual system disclosed in the present application is beneficial to controlling the light exit angles of the first lens and the second lens, reducing the stray light risk at the first spacer element, and further improving the imaging quality of the visual system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0020] Figure 1 A schematic diagram showing the structure and some parameters of a visual system according to an exemplary embodiment of this application is provided;

[0021] Figure 2 , Figure 3 and Figure 4 Schematic diagrams of the visual system according to Embodiment 1 of this application are shown in three different implementations.

[0022] Figure 5 , Figure 6 and Figure 7 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual system of Example 1 are shown respectively.

[0023] Figure 8 , Figure 9 and Figure 10 Schematic diagrams of the visual system according to Embodiment 2 of this application are shown in three different implementations.

[0024] Figure 11 , Figure 12 and Figure 13 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual system of Example 2 are shown respectively.

[0025] Figure 14 , Figure 15 and Figure 16 Schematic diagrams of the visual system according to Embodiment 3 of this application are shown in three different implementations; and

[0026] Figure 17 , Figure 18 and Figure 19 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual system of Example 3 are shown respectively. Detailed Implementation

[0027] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0029] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0030] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region.

[0031] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0032] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] The features, principles, and other aspects of the present application will be described in detail below.

[0035] According to an exemplary embodiment of the present application, a visual system may include a lens barrel and a lens group assembled in the lens barrel. The lens group may include a first element group and a second element group arranged in sequence from the first side to the second side along the optical axis.

[0036] In an exemplary embodiment, the first element group may have a positive optical power. The first element group may include a reflective polarizing element, a first lens, and a second lens.

[0037] In an exemplary embodiment, the second element group may have a positive optical power or a negative optical power. The second element group may include a third lens.

[0038] In an exemplary embodiment, the visual system may further include a first spacer element located between the first lens and the second lens, and a second spacer element located between the second lens and the third lens.

[0039] In an exemplary embodiment, the visual system of the present application may satisfy the conditional formula 3 < FG1 / (D1s - d1s) < 6, where FG1 is the effective focal length of the first element group, D1s is the outer diameter of the first side surface of the first spacer element, and d1s is the inner diameter of the first side surface of the first spacer element. It can be understood that for each element in the visual system, the surface close to the first side and far from the second side is the first side surface of the element, and the surface close to the second side and far from the first side is the second side surface of the element.

[0040] The visual system provided according to an exemplary embodiment of the present application includes a first element group and a second element group arranged in sequence from the first side to the second side along the optical axis and assembled in the lens barrel. Among them, the first element group has a positive optical power and includes a reflective polarizing element, a first lens, and a second lens; the second element group has a positive optical power or a negative optical power and includes a third lens; and 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; at the same time, the effective focal length FG1 of the first element group, the outer diameter D1s of the first side surface of the first spacer element, and the inner diameter d1s of the first side surface of the first spacer element are controlled to satisfy the conditional formula 3 < FG1 / (D1s - d1s) < 6. By such a setting of the visual system, it is beneficial to control the light emission angle of the first lens and the second lens, weaken the stray light risk at the first spacer element, and further improve the imaging quality of the visual system.

[0041] In an exemplary embodiment, the first side may be, for example, the human eye side, and the second side may be, for example, the display side. The visual system may be used in, for example, a variety of VR display devices.

[0042] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.5 < (EP01 + CP1) / (CTR + CT1) < 3.5, where EP01 is the distance along the optical axis from the first side end face of the lens barrel (i.e., the end face or surface of the lens barrel closest to the first side) to the first side face of the first spacer element, CP1 is the maximum thickness of the first spacer element along the direction parallel to 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 ratio of the sum of the distance along the optical axis from the first side end face of the lens barrel to the first side face of the first spacer element and the maximum thickness of the first spacer element along the direction parallel to the optical axis to the sum of the central thickness of the reflective polarizing element on the optical axis and the central thickness of the first lens on the optical axis within this range, and reasonably distributing the edge thickness of the first lens and the thickness of the first spacer element, the machinability of the first lens and the first spacer element can be improved on the premise of ensuring system assembly.

[0043] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 0.5 < |FG2| / (d2m + D2m) < 9.5, where FG2 is the effective focal length of the second element group, d2m is the inner diameter of the second side face of the second spacer element, and D2m is the outer diameter of the second side face of the second spacer element. By controlling the effective focal length of the second element group, the inner diameter of the second side face of the second spacer element, and the outer diameter of the second side face of the second spacer element to satisfy the conditional formula 0.5 < |FG2| / (d2m + D2m) < 9.5, the shape of the third lens can be restricted, which is beneficial to reducing the sensitivity of the third lens, thereby improving the assembly yield; and the inner diameter and outer diameter of the second side face of the second spacer element can be controlled to meet the lens support of its structure while ensuring the machinability of the second spacer element.

[0044] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula -3.5 < R1 / d0s < -0.5, where R1 is the radius of curvature of the first side face of the first lens, and d0s is the inner diameter of the first side end face of the lens barrel. By controlling the ratio of the radius of curvature of the first side face of the first lens to the inner diameter of the first side end face of the lens barrel within this range, the optical power value of the first lens can be restricted, making its light path more optimal, which helps to improve the image quality of the system and the relative illuminance of the system.

[0045] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.5 < (R2 × R3) / (d1m × D1m) < 6, where R2 is the radius of curvature of the second side surface of the first lens, R3 is the radius of curvature of the first side surface of the second lens, d1m is the inner diameter of the second side surface of the first spacer element, and D1m is the outer diameter of the second side surface of the first spacer element. By controlling the radius of curvature of the second side surface of the first lens, the radius of curvature of the first side surface of the second lens, the inner diameter of the second side surface of the first spacer element, and the outer diameter of the second side surface of the first spacer element to satisfy the conditional formula 1.5 < (R2 × R3) / (d1m × D1m) < 6, restricting the radius of curvature of the second side surface of the first lens and the first side surface of the second lens is beneficial to reducing the sensitivity of the first lens and the second lens, thereby improving the assembly yield; and the inner diameter and outer diameter of the second side surface of the first spacer element can be controlled to satisfy the lens support of the first spacer element structure while ensuring the machinability of the first spacer element.

[0046] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 0.6 < L / TD < 1.6, where L is the distance along the optical axis from the first side end surface of the lens barrel to the second side end surface of the lens barrel, that is, the distance along the optical axis from the end surface or surface closest to the first side of the lens barrel to the end surface or surface closest to the second side of the lens barrel, and TD is the distance along the optical axis from the first side surface of the first lens to the second side surface of the third lens. By controlling the ratio of the distance along the optical axis from the first side end surface of the lens barrel to the second side end surface of the lens barrel to the distance along the optical axis from the first side surface of the first lens to the second side surface of the third lens within this range, the overall thickness of the lens assembly can be restricted, which is beneficial to achieving the center of gravity of the display device to be behind, and ensuring the experience of the display device.

[0047] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 2.1 < (CT2 + T23) / (EP12 + CP2) < 4.7, where CT2 is the central thickness of the second lens on the optical axis, T23 is the distance along the optical axis from the second side surface of the second lens to the first side surface of the third lens, 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, and CP2 is the maximum thickness of the second spacer element in the direction parallel to the optical axis. By controlling the ratio of the sum of the central thickness of the second lens on the optical axis and the distance along the optical axis from the second side surface of the second lens to the first side surface of the third lens to the sum of 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 and the maximum thickness of the second spacer element in the direction parallel to the optical axis within this range, reasonably distributing the edge thickness of the second lens and the thickness of the second spacer element can improve the machinability of the second lens and the second spacer element on the premise of ensuring the system assembly.

[0048] In an exemplary embodiment, the visual system of the present application may 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 closest to the first side inside the lens barrel) and the first lens, and abuts against the first side surface of the first lens. The visual system of the present application can satisfy the condition 3.3 < (d0bs + d0bm) / f < 4.3, where d0bs is the inner diameter of the first side surface of the lens barrel auxiliary element, d0bm is the inner diameter of the second side surface of the lens barrel auxiliary element, and f is the effective focal length of the visual system. By controlling the ratio of the sum of 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 the effective focal length of the visual system within this range, the shape of the lens barrel auxiliary element can be reasonably restricted, and its processability can be improved on the premise of ensuring system assembly.

[0049] In an exemplary embodiment, the visual system of the present application can satisfy the condition 11.2 < D0s / EPD < 13.2, where D0s is the outer 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 outer diameter of the first side end surface of the lens barrel to the entrance pupil diameter of the visual system within this range, the shape of the lens barrel element is restricted, and on the premise of ensuring its processability, the size of the lens assembly can be minimized as much as possible, thereby improving the experience of the display device.

[0050] In an exemplary embodiment, the visual system of the present application may 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 closest to the first side inside the lens barrel) and the first lens, and abuts against the first side surface of the first lens. The first element group may further include a quarter-wave plate, and the quarter-wave plate may be located on the first side surface or the second side surface of the second lens. The visual system of the present application can satisfy the condition 0.3 < (CP0b + CP1) / (CTR + CTQ) < 7.8, where CP0b is the maximum thickness of the lens 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, CTR is the central thickness of the reflective polarizing element on the optical axis, and CTQ is the central thickness of the quarter-wave plate on the optical axis. By controlling the ratio of the sum of the maximum thickness of the lens barrel auxiliary element along the direction parallel to the optical axis and the maximum thickness of the first spacer element along the direction parallel to the optical axis to the sum of the central thickness of the reflective polarizing element on the optical axis and the central thickness of the quarter-wave plate on the optical axis within this range, the thicknesses of the reflective polarizing element and the quarter-wave plate are restricted, and on the premise that they meet the optical folding requirements, the loss of light by the reflective polarizing element and the quarter-wave plate can be minimized as much as possible, thereby improving the imaging quality.

[0051] In an exemplary embodiment, the visual system of this application can satisfy the condition 0.4 < (R4 × R5) / (d2s × D2s) < 1.6, where R4 is the radius of curvature of the second side surface of the second lens, R5 is the radius of curvature of the first side surface of the third lens, d2s is the inner diameter of the first side surface of the second spacer, and D2s is the outer diameter of the first side surface of the second spacer. By controlling the radius of curvature of the second side surface of the second lens, the radius of curvature of the first side surface of the third lens, the inner diameter of the first side surface of the second spacer, and the outer diameter of the first side surface of the second spacer to satisfy the condition 0.4 < (R4 × R5) / (d2s × D2s) < 1.6, it is beneficial to reduce the sensitivity of the second and third lenses, thereby improving the assembly yield; and it can also satisfy the support of the second spacer structure for the lens while ensuring the manufacturability of the second spacer.

[0052] In an exemplary embodiment, the visual system of this application can satisfy the condition 1 < (D0m - d0m) / CT3 < 1.5, where D0m is the outer diameter of the second side end face of the lens barrel (i.e., the end face or surface of the lens barrel closest to the second side), d0m is the inner diameter of the second side end face of the lens barrel, and CT3 is the center thickness of the third lens on the optical axis. By controlling the ratio of the difference between the outer diameter and the inner diameter of the second side end face of the lens barrel to the center thickness of the third lens on the optical axis within this range, the overall size of the lens barrel can be minimized while ensuring its manufacturability, thereby reducing the overall size of the machine.

[0053] In an exemplary embodiment, the visual system of this application may include at least one aperture stop. The aperture stop can constrain the optical path and control the light intensity. The aperture stop can be set at an appropriate position in the visual system as needed; for example, the aperture stop can be set between the first side (the human eye side) and the first lens.

[0054] In an exemplary embodiment, the above-described visual system may optionally include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0055] The visual system according to the above embodiments of the present application is provided with a first element group and a second element group that are assembled in a lens barrel and arranged in sequence along the optical axis from the first side to the second side. Among them, the first element group has a positive optical power and includes a reflective polarizing element, a first lens, and a second lens; the second element group has a positive or negative optical power and includes a third lens; moreover, 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; at the same time, it is controlled that the effective focal length FG1 of the first element group, the outer diameter D1s of the first side of the first spacer element, and the inner diameter d1s of the first side of the first spacer element satisfy the conditional formula 3 < FG1 / (D1s - d1s) < 6. This setting of the visual system disclosed in the present application is beneficial to controlling the light exit angles of the first lens and the second lens, reducing the stray light risk at the first spacer element, and further improving the imaging quality of the visual system.

[0056] For the visual system according to the embodiments of the present application, by designing a three-mirror folding scheme and adopting a two-piece composite film design with curved surface attachment, etc., the body height can be better compressed and the imaging quality can be improved.

[0057] The following further describes specific embodiments of the visual system applicable to the above embodiments with reference to the drawings.

[0058] Example 1

[0059] The following refers to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 、 Figure 6 and Figure 7 to describe the visual system according to Embodiment 1 of the present application. Figure 2 、 Figure 3 and Figure 4 respectively show schematic structural diagrams 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).

[0060] As Figure 2 、 Figure 3 and Figure 4 shown, the visual system includes a lens barrel P0 and, assembled in the lens barrel P0 and arranged in sequence 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 second lens E2, a quarter-wave plate QWP, and a third lens E3; the visual system further includes an image plane IMG.

[0061] In this embodiment, the reflective polarizing element RP, the first lens E1, the second lens E2, and the quarter-wave plate QWP 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 first side surface of the quarter-wave plate QWP (the surface closer to the human eye and farther from the display) can be attached to the second side surface of the second lens E2 (the surface closer to the display and farther from the human eye). The first element group has positive optical power.

[0062] In this embodiment, the second element group includes a third lens E3. The second element group has positive optical power.

[0063] 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 (i.e., the end face inside the lens barrel closest to 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.

[0064] Table 1 shows the basic parameters of the visual system of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0065] surface Surface type radius of curvature Thickness / Distance Refractive index Abbe number Refraction / Reflection S0 spherical endless endless refraction S1 spherical endless 20.1956 refraction S2 aspherical -51.2244 0.2000 1.50 57.00 refraction S3 aspherical -51.2244 2.0894 1.67 19.00 refraction S4 aspherical -62.2238 0.1000 refraction S5 aspherical -99.9462 7.2109 1.54 56.00 refraction S6 aspherical -48.9883 0.2000 1.50 57.00 refraction S7 aspherical -48.9883 3.3357 refraction S8 aspherical -45.1915 -3.3357 reflection S9 aspherical -48.9883 -0.2000 1.50 57.00 refraction S10 aspherical -48.9883 -7.2109 1.54 56.00 refraction S11 aspherical -99.9462 -0.1000 refraction S12 aspherical -62.2238 -2.0894 1.67 19.00 refraction S13 aspherical -51.2244 2.0894 1.67 19.00 reflection S14 aspherical -62.2238 0.1000 refraction S15 aspherical -99.9462 7.2109 1.54 56.00 refraction S16 aspherical -48.9883 0.2000 1.50 57.00 refraction S17 aspherical -48.9883 3.3357 refraction S18 aspherical -45.1915 2.3734 1.67 19.00 refraction S19 aspherical -46.4248 3.2053 refraction S20 spherical endless 0.0000 refraction

[0066] Table 1

[0067] In Example 1, surfaces S2 to S19 are all aspherical surfaces, and the surface shape x of each aspherical surface can be defined using, but is not limited to, the following aspherical formula:

[0068]

[0069] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A19 that can be used for each aspherical surface S3 to S6 and S18 and S19 in Example 1. 10 A 12 A 14 A 16 A 18 and A 20 .

[0070] coefficient\surface S3 S4 S5 S6 S18 S19 A4 -2.8936E-01 -1.5113E-01 1.3327E-01 -4.8905E-03 -2.8988E-01 2.6714E-01 A6 1.9843E-01 -2.6197E-01 -2.7377E-01 3.2017E-01 8.8077E-02 -2.4404E-02 A8 -7.2904E-03 3.0361E-02 -4.9264E-03 -1.2643E-01 5.3540E-03 -1.8751E-01 A10 -1.6157E-03 5.3787E-03 -1.1425E-02 2.2082E-02 -7.6645E-03 9.1382E-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

[0071] Table 2

[0072] The relevant parameter values ​​in this embodiment are shown in Table 7, combined with... Figure 2 , Figure 3 , Figure 4 as well as Figure 1 Wherein, d1s is the inner diameter of the first side surface of the first spacer element P1; d1m is the inner diameter of the second side surface of the first spacer element P1; D1s is the outer diameter of the first side surface of the first spacer element P1; D1m 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 face of the lens barrel P0; d0m is the inner diameter of the second side end face of the lens barrel P0; D0s is the outer diameter of the first side end face of the lens barrel P0; D0m is the inner diameter of the second side end face of the lens barrel P0; D0s is the outer diameter of the first side end face of the lens barrel P0; D0m is the inner diameter of the second side end face of the lens barrel P0. The outer diameter of the end face; EP01 is the distance along the optical axis from the first side end face of the lens barrel P0 to the first side face of the first spacer element P1; CP1 is the maximum thickness of the first spacer element P1 along the direction parallel to the optical axis; EP12 is the distance along the optical axis from the second side face of the first spacer element P1 to the first side face of the second spacer element P2; CP2 is the maximum thickness along the optical axis of the second spacer element P2; L is the distance along the optical axis from the first side end face of the lens barrel P0 to the second side end face of the lens barrel P0; d0bs is the inner diameter of the first side face of the lens barrel auxiliary element P0b; d0bm is the inner diameter of the second side face of the lens barrel auxiliary element P0b; and CP0b is the maximum thickness along the optical axis of the lens barrel auxiliary element P0b. All parameters shown in Table 7 are in millimeters (mm).

[0073] Figure 5 An on-axis chromatic aberration curve of the visual system of Embodiment 1 is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the lens. Figure 6 The astigmatic curves of the visual system of Embodiment 1 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 7 The distortion curves of the visual system of Embodiment 1 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 5 to 7 It can be seen that the visual system given in Example 1 can achieve good imaging quality.

[0074] Example 2

[0075] The following is for reference Figure 8 , Figure 9 , Figure 10 as well as Figure 11 , Figure 12 and Figure 13A visual system according to Embodiment 2 of this application is described. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted. Figure 8 , Figure 9 and Figure 10 The diagrams show the structure of the visual system according to Embodiment 2 of this application under three different implementations (Implementation 2-1, Implementation 2-2, and Implementation 2-3).

[0076] like Figure 8 , Figure 9 and Figure 10 As shown, the visual system includes a lens barrel P0 and, mounted in the lens barrel P0, the following components arranged sequentially along the optical axis from the first side (human eye side) to the second side (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 also includes an image surface IMG.

[0077] 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.

[0078] In this embodiment, the second element group includes a third lens E3. The second element group has negative optical power.

[0079] 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.

[0080] Table 3 shows the basic parameters of the visual system of Example 2, where the units for radius of curvature and thickness / distance are millimeters (mm). In this example, surfaces S2 to S19 are all aspherical surfaces. Table 4 shows the higher-order coefficients A4, A6, A8, A19 that can be used for aspherical surfaces S3, S4, S6, S7, S18, and S19 in Example 2. 10 A 12 A 14 A 16 A 18 and A 20Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0081]

[0082]

[0083] Table 3

[0084] coefficient\surface S3 S4 S6 S7 S18 S19 A4 1.9887E-01 -1.9268E-01 2.3843E-01 -5.2062E-02 2.7880E-01 -2.3371E-01 A6 1.4662E-01 -4.2712E-02 -1.4118E-01 2.9558E-01 7.2087E-02 -1.6573E-01 A8 -3.8664E-02 -1.4715E-01 2.1236E-02 9.3743E-02 -2.4548E-02 -7.1272E-02 A10 -6.5591E-03 -3.1046E-03 1.4213E-04 3.0666E-04 -2.9853E-03 7.2500E-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

[0085] Table 4

[0086] The relevant parameter values ​​in Example 2 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).

[0087] Figure 11 The on-axis chromatic aberration curve of the visual system of Embodiment 2 is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the lens. Figure 12 The astigmatic curves of the visual system of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 13 The distortion curves of the visual system in Example 2 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 11 to 13 It can be seen that the visual system given in Example 2 can achieve good imaging quality.

[0088] Example 3

[0089] The following is for reference Figure 14 , Figure 15 , Figure 16 as well as Figure 17 , Figure 18 and Figure 19 A visual system according to Embodiment 3 of this application is described. Figure 14 , Figure 15 and Figure 16 The diagrams show the structure of the visual system according to Embodiment 3 of this application under three different implementations (Implementation 3-1, Implementation 3-2, and Implementation 3-3).

[0090] like Figure 14 , Figure 15 and Figure 16 As shown, the visual system includes a lens barrel P0 and, mounted in the lens barrel P0, the following components arranged sequentially along the optical axis from the first side (human eye side) to the second side (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 also includes an image surface IMG.

[0091] 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.

[0092] In this embodiment, the second element group includes a third lens E3. The second element group has negative optical power.

[0093] 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.

[0094] 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.

[0095] surface Surface type radius of curvature Thickness / Distance Refractive index Abbe number Refraction / Reflection S0 spherical endless endless refraction S1 spherical endless 18.5927 refraction S2 aspherical -71.7746 0.2000 1.50 57.00 refraction S3 aspherical -71.7746 1.9700 1.60 26.13 refraction S4 aspherical -95.9737 0.1000 refraction S5 aspherical -140.7247 0.3000 1.50 57.00 refraction S6 aspherical -140.7247 11.2197 1.56 46.39 refraction S7 aspherical -40.0554 0.1000 refraction S8 aspherical -42.1444 2.0000 1.64 21.46 refraction S9 aspherical -56.3156 -2.0000 1.64 21.46 reflection S10 aspherical -42.1444 -0.1000 refraction S11 aspherical -40.0554 -11.2197 1.56 46.39 refraction S12 aspherical -140.7247 -0.3000 1.50 57.00 refraction S13 aspherical -140.7247 -0.1000 refraction S14 aspherical -95.9737 -1.9700 1.60 26.13 refraction S15 aspherical -71.7746 1.9700 1.60 26.13 reflection S16 aspherical -95.9737 0.1000 refraction S17 aspherical -140.7247 0.3000 1.50 57.00 refraction S18 aspherical -140.7247 11.2197 1.56 46.39 refraction S19 aspherical -40.0554 0.1000 refraction S20 aspherical -42.1444 2.0000 1.64 21.46 refraction S21 aspherical -56.3156 5.3777 refraction S22 spherical endless 0.0000 refraction

[0096] Table 5

[0097]

[0098]

[0099] Table 6

[0100] 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).

[0101] Figure 17The 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. Figure 18 The astigmatic curves of the visual system of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 19 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... Figures 17 to 19 It can be seen that the visual system given in Example 3 can achieve good imaging quality.

[0102] Parameters / Examples 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 d1s 57.7864 54.6154 54.6154 57.3707 57.3707 57.3707 59.4580 58.4767 59.4580 d1m 57.7864 56.8515 56.4515 59.0434 59.0434 59.0429 59.4580 59.4318 59.4580 D1s 64.6617 62.6762 61.1762 61.7664 61.7664 61.7664 65.5815 65.0429 65.5815 D1m 64.6617 63.0670 61.5670 63.3536 63.3536 63.3531 65.5815 64.9981 65.5815 d2s 59.5585 59.5585 63.3121 59.7548 59.2865 59.2865 59.5674 59.5674 59.5668 d2m 60.6808 60.6808 63.3121 59.0954 59.2865 59.2865 59.5674 59.5674 59.5668 D2s 64.3542 64.3542 68.5212 64.0361 66.8426 67.4426 67.6841 67.6841 67.6841 D2m 65.7352 65.7352 68.5212 64.2987 66.8426 67.4426 67.6841 67.6841 67.6841 d0s 51.1312 51.1312 51.1312 56.9290 56.9290 56.9290 55.0162 59.9170 55.4071 d0m 71.0652 71.0652 71.0652 69.3277 69.3277 69.9277 70.9535 70.9535 70.9535 D0s 59.5737 64.5963 64.5963 64.4639 64.4639 64.4639 60.5483 64.9758 60.5558 D0m 74.0531 74.0531 74.0531 71.9277 71.9277 72.5277 73.3691 73.3691 73.3691 EP01 7.0717 6.2725 6.2725 4.3231 4.3231 4.4231 5.8850 5.2572 5.8329 CP1 0.1000 1.3759 1.3759 2.9906 2.9906 2.7906 0.1000 0.8278 0.1000 EP12 2.2649 1.7882 3.3725 1.9295 2.1799 2.5799 2.3292 2.3292 2.3292 CP2 1.6843 1.6843 0.1000 0.9535 0.1000 0.1000 0.1000 0.1000 0.1000 L 15.7856 15.7856 15.7856 17.9176 17.9176 17.9176 13.3856 13.4856 13.3335 d0bs 50.4789 50.4789 50.4789 56.3935 56.3935 56.3935 53.7271 57.7271 54.1180 d0bm 50.4789 50.4789 50.4789 56.3935 56.3935 56.3935 53.7271 57.7271 54.1180 CP0b 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000 0.1000

[0103] Table 7

[0104] Furthermore, in Examples 1 to 3, the effective focal length FG1 of the first element group, the effective focal length FG2 of the second 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.

[0105] Parameters / Examples 1 2 3 FG1(mm) 26.83 25.58 27.34 FG2(mm) 1186.53 -98.95 -258.94 f(mm) 27.33 29.05 28.43 EPD (mm) 5.00 5.00 5.00 TD(mm) 15.31 12.71 15.69 CTR(mm) 0.20 0.20 0.20 CTQ(mm) 0.20 0.20 0.30

[0106] Table 8

[0107] Examples 1 to 3 respectively satisfy the conditions shown in Table 9.

[0108] Conditional / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 FG1 / (D1s-d1s) 3.90 3.33 4.09 5.82 5.82 5.82 4.47 4.16 4.47 (EP01+CP1) / (CTR+CT1) 3.13 3.34 3.34 1.68 1.68 1.66 2.76 2.80 2.73 |FG2| / (d2m+D2m) 9.39 9.39 9.00 0.80 0.78 0.78 2.03 2.03 2.03 R1 / d0s -1.00 -1.00 -1.00 -3.18 -3.18 -3.18 -1.30 -1.20 -1.30 (R2×R3) / (d1m×D1m) 1.66 1.73 1.79 5.75 5.75 5.75 3.46 3.50 3.46 L / TD 1.03 1.03 1.03 1.41 1.41 1.41 0.85 0.86 0.85 (CT2+T23) / (EP12+CP2) 2.72 3.09 3.09 2.17 2.75 2.34 4.66 4.66 4.66 (d0bs+d0bm) / f 3.69 3.69 3.69 3.88 3.88 3.88 3.78 4.06 3.81 D0s / EPD 11.91 12.92 12.92 12.89 12.89 12.89 12.11 13.00 12.11 (CP0b+CP1) / (CTR+CTQ) 0.50 3.69 3.69 7.73 7.73 7.23 0.40 1.86 0.40 (R4×R5) / (d2s×D2s) 0.58 0.58 0.51 1.58 1.52 1.51 0.42 0.42 0.42 (D0m-d0m) / CT3 1.26 1.26 1.26 1.30 1.30 1.30 1.21 1.21 1.21

[0109] Table 9

[0110] 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.

[0111] 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. Vision system, characterized in that The visual system comprises a lens barrel and a first element group and a second element group assembled in the lens barrel in order along an optical axis from a first side to a second side, wherein the first element group has positive refractive power and comprises a reflective polarizing element, a first lens, a second lens, and a quarter wave plate located on a first side or a second side of the second lens, wherein the reflective polarizing element is attached to a first side of the first lens; the second element group has negative refractive power and comprises a third lens; the first lens has positive or negative refractive power, and a first side of the first lens is concave and a second side of the first lens is convex; the second lens has positive refractive power, and a first side of the second lens is concave and a second side of the second lens is convex; the third lens has negative refractive power, and a first side of the third lens is concave; the number of lenses with refractive power in the visual system is three; a first spacer element is between the first lens and the second lens, and a second spacer element is between the second lens and the third lens; the visual system satisfies: 3.33≤FG1 / (D1s-d1s)≤5.82, where FG1 is an effective focal length of the first element group, D1s is an outer diameter of a first side of the first spacer element, and d1s is an inner diameter of the first side of the first spacer element.

2. The vision system of claim 1, wherein, a distance EP01 from a first end surface of the lens barrel to a first side of the first spacer element along the optical axis, a maximum thickness CP1 of the first spacer element along a direction parallel to the optical axis, a central thickness CTR of the reflective polarizing element along the optical axis, and a central thickness CT1 of the first lens along the optical axis satisfy: 1.66≤(EP01+CP1) / (CTR+CT1)≤3.

34.

3. The vision system of claim 1, wherein, an effective focal length FG2 of the second element group, an inner diameter d2m of a second side of the second spacer element, and an outer diameter D2m of the second side of the second spacer element satisfy: 0.78≤|FG2| / (d2m+D2m)≤9.

39.

4. The vision system of claim 1, wherein, a radius of curvature R1 of the first side of the first lens and an inner diameter d0s of the first end surface of the lens barrel satisfy: -3.18≤R1 / d0s≤-1.

00.

5. The vision system of claim 1, wherein, a radius of curvature R2 of the second side of the first lens, a radius of curvature R3 of the first side of the second lens, an inner diameter d1m of a second side of the first spacer element, and an outer diameter D1m of the second side of the first spacer element satisfy: 1.66≤(R2×R3) / (d1m×D1m)≤5.

75.

6. The vision system of claim 1, wherein, a distance L from the first end surface of the lens barrel to a second end surface of the lens barrel along the optical axis, and a distance TD from the first side of the first lens to the second side of the third lens along the optical axis satisfy: 0.85≤L / TD≤1.

41.

7. The vision system of any one of claims 1 to 6, wherein, A center thickness CT2 of the second lens on the optical axis, a distance T23 from a second side of the second lens to a first side of the third lens along the optical axis, a distance EP12 from a second side of the first spacer element to a first side of the second spacer element along the optical axis, and a maximum thickness CP2 of the second spacer element along a direction parallel to the optical axis satisfy: 2.17≤(CT2+T23) / (EP12+CP2)<4.

7.

8. The vision system of any one of claims 1 to 6, wherein, The visual system further comprises a lens barrel auxiliary element located between an inner end surface of the lens barrel close to the first side and the first lens, and abutting against the first side of the first lens; An inner diameter d0bs of a first side of the lens barrel auxiliary element, an inner diameter d0bm of a second side of the lens barrel auxiliary element, and an effective focal length f of the visual system satisfy: 3.69≤(d0bs+d0bm) / f≤4.

06.

9. The vision system of any one of claims 1 to 6, wherein, An outer diameter D0s of the first side end surface of the lens barrel and an entrance pupil diameter EPD of the visual system satisfy: 11.91≤D0s / EPD≤13.

00.

10. The vision system of claim 8, wherein, A maximum thickness CP0b of the lens barrel auxiliary element along a direction parallel to the optical axis, a maximum thickness CP1 of the first spacer element along a direction parallel to the optical axis, a center thickness CTR of the reflective polarizing element on the optical axis, and a center thickness CTQ of the quarter-wave plate on the optical axis satisfy: 0.40≤(CP0b+CP1) / (CTR+CTQ)≤7.

73.

11. The vision system of any one of claims 1 to 6, wherein, A curvature radius R4 of the second side of the second lens, a curvature radius R5 of the first side of the third lens, an inner diameter d2s of the first side of the second spacer element, and an outer diameter D2s of the first side of the second spacer element satisfy: 0.4<(R4×R5) / (d2s×D2s)<1.

6.

12. The vision system of any one of claims 1 to 6, wherein, An outer diameter D0m of the second side end surface of the lens barrel, an inner diameter d0m of the second side end surface of the lens barrel, and a center thickness CT3 of the third lens on the optical axis satisfy: 1.21≤(D0m-d0m) / CT3≤1.

30.

13. A VR device comprising the visual system of at least one of claims 1 to 12, wherein, The first side is an eye side, and the second side is a display side.

Images