Visual system and VR equipment comprising visual system

Abstract

The utility model discloses a visual system and VR equipment comprising the visual system. The visual system comprises a lens barrel, a lens group and a spacing element group, the lens group and the spacing element group are assembled in the lens barrel, the lens group comprises a first lens, a reflective polarizing element, a quarter-wave plate, a second lens and a third lens which are sequentially arranged from a first side to a second side along an optical axis, the first lens has positive focal power, the second lens has positive focal power or negative focal power, and the third lens has positive focal power or negative focal power. The third lens has positive focal power; the spacing element group comprises a lens barrel auxiliary element which is located between the front end of the lens barrel and the first lens and abuts against the first side face of the first lens, and a first spacing element which is located between the first lens and the second lens and abuts against the second side face of the first lens. The inner diameter d0s of the first side end surface of the lens cone and the effective focal length f of the visual system satisfy 1.8 lt; d0s / flt; 2, 3; 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 curvature radius R1 of the first side surface of the first lens satisfy 0.1 lt; (d0bs + d0bm) / R1lt; and 0.95%.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to a visual system and a VR device including the visual system. Background Art

[0002] In recent years, with the proposal of the concept of "metaverse", the ways of people's entertainment have become increasingly rich. Among them, devices such as AR / VR (augmented reality / virtual reality) for human-computer interaction have developed rapidly and are increasingly loved by people. However, there are still problems with current VR lenses, such as large volume, heavy weight, and easy to cause dizziness, which need to be solved urgently. Therefore, the miniaturization, light weight, and improvement of imaging quality of the lens have become several aspects that need to be focused on and improved to enhance the consumer experience.

[0003] In order to better solve the above problems existing in current VR lenses and achieve a better user experience, for a three-piece lens structure system, those skilled in the art are committed to further optimizing the structural design, including the lens barrel, lenses, and spacer elements, etc., so that the lens structure is more compact and lightweight, and at the same time, chromatic aberration, phase difference, and various stray lights can be better eliminated, and the imaging quality can be improved, in order to provide a better immersive experience for users on the premise of realizing miniaturization and light weight. Summary of the Utility Model

[0004] The present application provides a visual system, which may include a lens barrel and a lens group and a spacer element group assembled in the lens barrel. The lens group includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens arranged in sequence along the optical axis from the first side to the second side. Among them, the first lens has a positive optical power; the second lens has a positive or negative optical power; the third lens has a positive optical power; the spacer element group includes: a lens barrel auxiliary element located between the inner end face of the first side of the lens barrel and the first lens and abutted against the first side face of the first lens; a first spacer element located between the first lens and the second lens and abutted against the second side face of the first lens. The visual system satisfies: 1.8 < d0s / f < 2.3 and 0.1 < (d0bs + d0bm) / |R1| < 0.95, where d0s is the inner diameter of the end face of the first side of the lens barrel, f is the effective focal length of the visual system, d0bs is the inner diameter of the first side face of the lens barrel auxiliary element, d0bm is the inner diameter of the second side face of the lens barrel auxiliary element, and R1 is the curvature radius of the first side face of the first lens.

[0005] In one embodiment, the curvature radius R2 of the second side face of the first lens and the inner diameter d1s of the first side face of the first spacer element satisfy: -3.1 < R2 / d1s < -2.7.

[0006] In one embodiment, an outer diameter D1m of the second side surface of the first spacer element, an inner diameter d1m of the second side surface of the first spacer element, and a center thickness CT2 of the second lens on the optical axis satisfy: 2.9<(D1m-d1m) / CT2<5.1.

[0007] In one embodiment, the distance TD from the first side surface of the first lens to the second side surface of the third lens on the optical axis and the maximum distance L from the first side end surface of the lens barrel to the second side end surface of the lens barrel along the optical axis satisfy: 1.1 <TD / L<1.5。

[0008] In one embodiment, the effective focal length f3 of the third lens and the inner diameter d0m of the second side end surface of the lens barrel satisfy: 1.4 <f3 / d0m<1.8。

[0009] In one embodiment, the combined focal length f23 of the second lens and the third lens and the outer diameter D1s of the first side surface of the first spacing element satisfy: 1.7 <f23 / D1s<2.5。

[0010] In one embodiment, an outer diameter D0bs of the first side surface of the barrel auxiliary element, an inner diameter d0bs of the first side surface of the barrel auxiliary element, and an entrance pupil diameter EPD of the visual system satisfy the following: 1.4<(D0bs-d0bs) / EPD<1.8.

[0011] In one embodiment, the combined focal length fz of the first lens, the reflective polarizing element, and the quarter-wave plate, 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 satisfy: 1.0 <fz / (d1s+d1m)<3.3。

[0012] In one embodiment, the effective focal length f1 of the first lens, the inner diameter d0bm of the second side surface of the lens barrel auxiliary element, and the outer diameter D0bm of the second side surface of the lens barrel auxiliary element satisfy: 1.0 <f1 / (d0bm+D0bm)<3.7。

[0013] In one embodiment, the outer diameter D0m of the second side end surface of the lens barrel, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis satisfy: 5.2 <D0m / (CT2+CT3)<5.9。

[0014] In one embodiment, the outer diameter D0s of the first side end surface of the lens barrel and the inner diameter d0s of the first side end surface of the lens barrel satisfy: 1.1 <D0s / d0s<1.6。

[0015] In one embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CTR of the reflective polarizing element on the optical axis, the central thickness CTQ of the quarter-wave plate on the optical axis, the inner diameter d1s of the first side surface of the first spacer element and the inner diameter d0bs of the first side surface of the lens barrel auxiliary element satisfy: 0.4 < (CT1 + CTR + CTQ) / (d1s - d0bs) < 1.7.

[0016] On the other hand, the present application also provides a VR device, which may include the visual system provided by any one of the above various embodiments, 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 includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens 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 lens has a positive optical power, the second lens has a positive or negative optical power, and the third lens has a positive optical power; it also includes a lens barrel auxiliary element located between the front end (the inner end surface of the first side) of the lens barrel and the first lens and abutting against the first side surface of the first lens, and a first spacer element located between the first lens and the second lens and abutting against the second side surface of the first lens; by reasonably configuring the visual system and controlling the inner diameter d0s of the first side end surface of the lens barrel and the effective focal length f of the visual system to satisfy the conditional formula 1.8 < d0s / f < 2.3, and controlling 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 curvature radius R1 of the first side surface of the first lens to satisfy the conditional formula 0.1 < (d0bs + d0bm) / |R1| < 0.95, on the one hand, it is possible to avoid the lens barrel opening being too small to block light when the focal length is short and having excessive light when the lens barrel opening is too large when the focal length is long; on the other hand, it can ensure the processability of the lens barrel and the lens barrel auxiliary element and improve its structural support effect. Description of the Drawings

[0018] In combination with the drawings, through the following detailed description of non-limiting embodiments, other features, objectives, and advantages of the present application will become more obvious. In the drawings:

[0019] Figure 1 It shows a schematic diagram of the structure and some parameters of the visual system according to an exemplary embodiment of the present application;

[0020] Figure 2 It shows a schematic diagram of the structure of the visual system according to Embodiment 1 of the present application;

[0021] Figure 3 It shows a schematic diagram of the structure of the visual system according to Embodiment 2 of the present application;

[0022] Figure 4 A schematic diagram of the structure of a visual system according to Embodiment 3 of the present application is shown;

[0023] Figure 5 A schematic diagram of the structure of a visual system according to Embodiment 4 of the present application is shown;

[0024] Figure 6 , Figure 7 and Figure 8 The axial chromatic aberration curve, astigmatism curve and distortion curve of the visual system of Examples 1 to 4 are respectively shown;

[0025] Fig. 9 A schematic diagram of the structure of a visual system according to Embodiment 5 of the present application is shown;

[0026] Fig.10 A schematic diagram of the structure of a visual system according to Embodiment 6 of the present application is shown;

[0027] Fig.11 A schematic diagram of the structure of a visual system according to Embodiment 7 of the present application is shown;

[0028] Fig.12 A schematic diagram of the structure of a visual system according to Embodiment 8 of the present application is shown; and

[0029] Fig.13 , Fig.14 and Fig.15 The axial chromatic aberration curve, astigmatism curve and distortion curve of the visual system of Examples 5 to 8 are respectively shown. DETAILED DESCRIPTION

[0030] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present 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.

[0031] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0032] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0033] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the convex position 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 concave position is not defined, it means that the lens surface is concave at least in the paraxial region.

[0034] It should also be understood that the terms "comprises", "including", "having", "includes" 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. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0035] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0036] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can also be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0037] The features, principles and other aspects of the present application are described in detail below.

[0038] A visual system according to an exemplary embodiment of the present application may include a lens barrel, and a lens group and a spacer element group assembled in the lens barrel.

[0039] In an exemplary embodiment, the lens group may include a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens arranged in sequence from a first side to a second side along the optical axis.

[0040] In an exemplary embodiment, the first lens may have a positive optical power; the second lens may have a positive or negative optical power; the third lens may have a positive optical power.

[0041] In an exemplary embodiment, the spacer element group may include: a barrel auxiliary element located between the inner end surface of the first side of the barrel (i.e., the end surface or surface closest to the first side inside the barrel) and the first lens, and abutting against the first side surface of the first lens; a first spacer element located between the first lens and the second lens, and abutting against the second side surface of the first lens.

[0042] In an exemplary embodiment, the visual system of the present application may satisfy the condition 1.8 < d0s / f < 2.3, where d0s is the inner diameter of the end surface of the first side of the barrel (the end surface or surface closest to the first side outside the barrel), and f is the effective focal length of the visual system.

[0043] In an exemplary embodiment, the visual system of the present application may satisfy the condition 0.1 < (d0bs + d0bm) / |R1| < 0.95, where d0bs is the inner diameter of the first side surface of the barrel auxiliary element, d0bm is the inner diameter of the second side surface of the barrel auxiliary element, and R1 is the radius of curvature of the first side surface of the first lens. 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.

[0044] The visual system provided according to the exemplary embodiments of the present application includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens that are sequentially arranged along the optical axis from the first side to the second side in a lens barrel. Among them, the first lens has a positive optical power, the second lens has a positive or negative optical power, and the third lens has a positive optical power. It further includes a lens barrel auxiliary element located between the inner end surface of the front end of the lens barrel, i.e., the first side of the lens barrel, and the first lens and abutted against the first side surface of the first lens, and a first spacer element located between the first lens and the second lens and abutted against the second side surface of the first lens. By reasonably configuring the visual system and controlling the inner diameter d0s of the first side end surface of the lens barrel and the effective focal length f of the visual system to satisfy the conditional formula 1.8 < d0s / f < 2.3, and controlling 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 curvature radius R1 of the first side surface of the first lens to satisfy the conditional formula 0.1 < (d0bs + d0bm) / |R1| < 0.95, on the one hand, it is possible to avoid the lens barrel opening being too small to block light in the case of short focal length and having excessive light in the case of long focal length; on the other hand, it is possible to ensure the processability of the lens barrel and the lens barrel auxiliary element and improve their structural support effect.

[0045] 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 a variety of VR display devices, for example.

[0046] In an exemplary embodiment, the visual system of the present application may satisfy the conditional formula -3.1 < R2 / d1s < -2.7, where R2 is the curvature radius of the second side surface of the first lens and d1s is the inner diameter of the first side surface of the first spacer element. By controlling the ratio of the curvature radius of the second side surface of the first lens to the inner diameter of the first side surface of the first spacer element within this range, it is possible to ensure the structural support of the first spacer element while not interfering with the assembly of the first lens.

[0047] In an exemplary embodiment, the visual system of the present application may satisfy the conditional formula 2.9 < (D1m - d1m) / CT2 < 5.1, where D1m is the outer diameter of the second side surface of the first spacer element, d1m is the inner diameter of the second side surface of the first spacer element, and CT2 is the central thickness of the second lens on the optical axis. By controlling the ratio of the difference between the outer diameter and the inner diameter of the second side surface of the first spacer element to the central thickness of the second lens on the optical axis within this range, it is possible to ensure a reasonable distribution of the inner diameter and the outer diameter of the second side surface of the first spacer element and ensure its processability.

[0048] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.1 < TD / L < 1.5, where TD is the distance on the optical axis from the first side surface of the first lens to the second side surface of the third lens, and L is the maximum distance on the optical axis from the first side end surface of the lens barrel to the second side end surface of the lens barrel. By controlling the ratio of the distance on the optical axis from the first side surface of the first lens to the second side surface of the third lens to the maximum distance on the optical axis from the first side end surface of the lens barrel to the second side end surface of the lens barrel within this range, it is possible to prevent the lens barrel from being too long and affecting the overall length of the entire machine, and at the same time, reasonably allocate the thicknesses of the various lens components to avoid them being too small, and ensure the processability of each component on the premise of ensuring system assembly.

[0049] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.4 < f3 / d0m < 1.8, where f3 is the effective focal length of the third lens, and d0m is the inner diameter of the second side end surface of the lens barrel. By controlling the ratio of the effective focal length of the third lens to the inner diameter of the second side end surface of the lens barrel within this range, it is possible to reduce the outer dimension of the lens barrel on the premise of ensuring the processability of the lens barrel, thereby reducing the overall dimension of the entire machine.

[0050] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.7 < f23 / D1s < 2.5, where f23 is the combined focal length of the second lens and the third lens, and D1s is the outer diameter of the first side surface of the first spacer element. By controlling the ratio of the combined focal length of the second lens and the third lens to the outer diameter of the first side surface of the first spacer element within this range, it is possible to reasonably allocate the relationship between the focal lengths of the second lens and the third lens and the outer diameter of the first side surface of the first spacer element, and ensure that the light path is more reasonable.

[0051] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.4 < (D0bs - d0bs) / EPD < 1.8, where D0bs is the outer diameter of the first side surface of the lens barrel auxiliary element, d0bs is the inner diameter of the first side surface of the lens barrel auxiliary element, and EPD is the entrance pupil diameter of the visual system. By controlling the ratio of the difference between the outer diameter and the inner diameter of the first side surface of the lens barrel auxiliary element to the entrance pupil diameter of the visual system within this range, it is possible to ensure the reasonable allocation of the inner diameter and the outer diameter of the first side surface of the lens barrel auxiliary element and ensure its processability; at the same time, limit the entrance pupil diameter of the visual system within a certain range, which can not only avoid too small an entrance pupil and insufficient light affecting the brightness and viewing angle of the entire machine, but also avoid too large an entrance pupil and generating too much stray light and ghosts.

[0052] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.0 < fz / (d1s + d1m) < 3.3, where fz is the combined focal length of the first lens, the reflective polarizing element, and the quarter-wave plate, 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 ratio of the combined focal length of the first lens, the reflective polarizing element, and the quarter-wave plate to the sum of 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 within this range, the combined focal length of the first lens, the reflective polarizing element, and the quarter-wave plate is restricted within a certain range, and the incident and exit angles of light are controlled to meet the usage conditions of the reflective polarizing element and the quarter-wave plate, prevent color aberration light leakage of the quarter-wave plate, and prevent a significant reduction in the reflectivity and transmittance of the reflective polarizing element from affecting the light efficiency.

[0053] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.0 < f1 / (d0bm + D0bm) < 3.7, where f1 is the effective focal length of the first lens, d0bm is the inner diameter of the second side surface of the barrel auxiliary element, and D0bm is the outer diameter of the second side surface of the barrel auxiliary element. By controlling the ratio of the effective focal length of the first lens to the sum of the inner diameter of the second side surface of the barrel auxiliary element and the outer diameter of the second side surface of the barrel auxiliary element within this range, a reasonable distribution of the inner diameter and outer diameter of the second side surface of the barrel auxiliary element is ensured, and its processability can be guaranteed.

[0054] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 5.2 < D0m / (CT2 + CT3) < 5.9, where D0m is the outer diameter of the second side end face of the barrel, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. By controlling the ratio of the outer diameter of the second side end face of the barrel to the sum of the central thickness of the second lens on the optical axis and the central thickness of the third lens on the optical axis within this range, the thicknesses of the second lens and the third lens can be reasonably distributed, and their processability can be ensured on the premise of ensuring system assembly.

[0055] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.1 < D0s / d0s < 1.6, where D0s is the outer diameter of the first side end face of the barrel, and d0s is the inner diameter of the first side end face of the barrel. By controlling the ratio of the outer diameter of the first side end face of the barrel to the inner diameter of the first side end face of the barrel within this range, the outer shape of the barrel structure can be reasonably restricted; on the one hand, it prevents the outer diameter of the barrel from being too large and affecting the assembly space of the overall machine design; on the other hand, it prevents the inner diameter of the barrel from being too small, which makes the processing and forming difficult.

[0056] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 0.4 < (CT1 + CTR + CTQ) / (d1s - d0bs) < 1.7, where CT1 is the central thickness of the first lens on the optical axis, CTR is the central thickness of the reflective polarizing element on the optical axis, CTQ is the central thickness of the quarter-wave plate on the optical axis, d1s is the inner diameter of the first side of the first spacer element, and d0bs is the inner diameter of the first side of the barrel auxiliary element. By controlling the ratio of the sum of the central thicknesses of the first lens, the reflective polarizing element, and the quarter-wave plate on the optical axis to the difference between the inner diameter of the first side of the first spacer element and the inner diameter of the first side of the barrel auxiliary element within this range, the thicknesses of the first lens, the reflective polarizing element, and the quarter-wave plate are reasonably allocated, avoiding the reflective polarizing element and the quarter-wave plate being too thick and affecting the curved surface film sticking effect, and also avoiding the reflective polarizing element and the quarter-wave plate being too thin to ensure the feasibility of their processing and lamination.

[0057] In an exemplary embodiment, the visual system of the present application may include at least one aperture stop. The aperture stop can restrict the light 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.

[0058] In an exemplary embodiment, optionally, the above visual system may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0059] On the one hand, for the visual system according to the above embodiment of the present application, by arranging a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens that are sequentially arranged along the optical axis from the first side to the second side and assembled in the barrel, where the first lens has a positive optical power, the second lens has a positive or negative optical power, and the third lens has a positive optical power; and arranging a barrel auxiliary element located between the inner end surface of the first side of the barrel and the first lens and abutting against the first side surface of the first lens, and a first spacer element located between the first lens and the second lens and abutting against the second side surface of the first lens; at the same time, controlling the inner diameter d0s of the first side end surface of the barrel and the effective focal length f of the visual system to satisfy the conditional formula 1.8 < d0s / f < 2.3, and controlling the inner diameter d0bs of the first side surface of the barrel auxiliary element, the inner diameter d0bm of the second side surface of the barrel auxiliary element, and the curvature radius R1 of the first side surface of the first lens to satisfy the conditional formula 0.1 < (d0bs + d0bm) / |R1| < 0.95, on the one hand, it can avoid the barrel opening being too small to block light when the focal length is short and having excessive light when the focal length is long; on the other hand, it can ensure the processability of the barrel and the barrel auxiliary element and improve their structural support effect.

[0060] On the other hand, for the visual system according to the above-described embodiment of the present application, by disposing a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens that are sequentially arranged along the optical axis from the first side to the second side in the lens barrel, wherein the first lens has a positive optical power, the second lens has a positive or negative optical power, and the third lens has a positive optical power; and by disposing a lens barrel auxiliary element that is located between the inner end surface of the first side of the lens barrel and the first lens and abuts against the first side surface of the first lens, and a first spacer element that is located between the first lens and the second lens and abuts against the second side surface of the first lens; and at the same time, controlling the effective focal length f3 of the third lens and the inner diameter d0m of the second side end surface of the lens barrel to satisfy the conditional formula 1.4 < f3 / d0m < 1.8, it is possible to reduce the external dimension of the lens barrel on the premise of ensuring the processability of the lens barrel, thereby reducing the overall dimension of the machine.

[0061] On the other hand, for the visual system according to the above-described embodiment of the present application, by disposing a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens that are sequentially arranged along the optical axis from the first side to the second side in the lens barrel, wherein the first lens has a positive optical power, the second lens has a positive or negative optical power, and the third lens has a positive optical power; and by disposing a lens barrel auxiliary element that is located between the inner end surface of the first side of the lens barrel and the first lens and abuts against the first side surface of the first lens, and a first spacer element that is located between the first lens and the second lens and abuts against the second side surface of the first lens; and at the same time, controlling the combined focal length f23 of the second lens and the third lens and the outer diameter D1s of the first side surface of the first spacer element to satisfy the conditional formula 1.7 < f23 / D1s < 2.5, it is possible to reasonably allocate the relationship between the focal lengths of the second lens and the third lens and the outer diameter of the first side surface of the first spacer element, and ensure that the light path is more reasonable.

[0062] On the other hand, according to the visual system of the above-mentioned embodiment of the present application, a first lens, a reflective polarizing element, a quarter-wave plate, a second lens and a third lens are arranged in sequence from the first side to the second side along the optical axis in a lens barrel, wherein the first lens has positive focal power, the second lens has positive focal power or negative focal power, and the third lens has positive focal power; and a lens barrel auxiliary element is provided between the inner end surface of the first side of the lens barrel and the first lens and abuts against the first side surface of the first lens, and a lens barrel auxiliary element is provided between the first lens and the second lens and abuts against the first side surface of the lens barrel. a first spacing element on the second side surface of the lens; at the same time, the outer diameter D0bs of the first side surface of the lens barrel auxiliary element, the inner diameter d0bs of the first side surface of the lens barrel auxiliary element, and the entrance pupil diameter EPD of the visual system are controlled to satisfy the conditional formula 1.4<(D0bs-d0bs) / EPD<1.8, so as to ensure the reasonable distribution of the inner diameter and the outer diameter of the first side surface of the lens barrel auxiliary element and ensure its machinability; at the same time, the entrance pupil diameter of the visual system is limited within a certain range, so as to avoid the entrance pupil being too small and the light being insufficient to affect the brightness and viewing angle of the whole machine, and to avoid the entrance pupil being too large and producing too many stray light ghost images.

[0063] In addition, the present application also provides a VR device, which may include the visual system provided by any of the above embodiments, wherein the first side is the human eye side and the second side is the display side. The VR device may have at least one of the beneficial effects of miniaturization, light weight and high imaging quality, and may allow users to obtain a better application experience.

[0064] Specific embodiments of the visual system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0065] Example 1

[0066] The following reference Figure 2 Describe the visual system according to Example 1 of the present application. Figure 2 A schematic structural diagram of a visual system according to Example 1 of the present application is shown.

[0067] like Figure 2 As shown, the visual system includes a lens barrel P0 and a first lens E1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2 and a third lens E3, which are arranged in sequence from the first side to the second side along the optical axis. The visual system also includes an image surface IMG located at the second side of the system.

[0068] In this embodiment, the first side surface (the surface close to the first side and away from the second side) of the reflective polarizing element RP is attached to the second side surface (the surface close to the second side and away from the first side) of the first lens E1, and the first side surface of the quarter-wave plate QWP is attached to the second side surface of the reflective polarizing element RP.

[0069] In this embodiment, the visual system also includes: a barrel auxiliary element P0b, located between the inner end surface of the first side of the barrel P0 and the first lens E1, and the barrel auxiliary element P0b can be disposed against the first side surface of the first lens; and a first spacing element P1, located between the first lens E1 and the second lens E2, and the first spacing element P1 can be disposed against the second side surface of the first lens.

[0070] In this embodiment, the first side may be, for example, a human eye side, and the second side may be, for example, a display side.

[0071] Table 1 shows the basic parameters of the visual system of Example 1, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0072] surface element Surface type Radius of curvature Thickness / distance Refractive Index Abbe number Refraction / Reflection S0 Spherical endless -1290.0000 refraction S1 Spherical endless 12.0000 refraction S2 First lens (E1) Aspheric 79.3621 6.6570 1.546 55.92 refraction S3 Reflective polarizer (RP) Aspheric -118.3395 0.1000 1.502 56.00 refraction S4 Quarter Wave Plate (QWP) Aspheric -118.3395 0.1000 1.502 56.00 refraction S5 Aspheric -118.3395 0.2500 refraction S6 Second lens (E2) Aspheric -168.5771 1.3214 1.546 55.92 refraction S7 Aspheric 560.8906 0.0000 refraction S8 Third lens (E3) Aspheric 560.8906 7.6755 1.546 55.92 refraction S9 Aspheric -45.5881 -7.6755 1.546 55.92 reflection S10 Aspheric 560.8906 0.0000 refraction S11 Second lens (E2) Aspheric 560.8906 -1.3214 refraction S12 Aspheric -168.5771 -0.2500 refraction S13 Quarter Wave Plate (QWP) Aspheric -118.3395 -0.1000 1.502 56.00 refraction S14 Reflective polarizer (RP) Aspheric -118.3395 0.1000 1.502 56.00 reflection S15 Aspheric -118.3395 0.2500 refraction S16 Second lens (E2) Aspheric -168.5771 1.3214 1.546 55.92 refraction S17 Aspheric 560.8906 0.0000 refraction S18 Third lens (E3) Aspheric 560.8906 7.6755 1.546 55.92 refraction S19 Aspheric -45.5881 0.9300 refraction S20 Image surface (IMG) Spherical endless 0.0000 refraction

[0073] Table 1

[0074] In Example 1, the first side surface S2 and the second side surface S3 of the first lens E1, the first side surface S6 and the second side surface S7 of the second lens E2, and the first side surface S8 and the second side surface S9 of the third lens E3 are all aspherical surfaces, and the surface type x of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0075]

[0076] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0077] Coefficient\Surface S2 S3 S6 S7 S8 S9 A4 -4.8524E-01 1.3422E-01 -3.4535E-01 -9.7724E-01 -9.7724E-01 6.3214E-03 A6 -8.1530E-02 2.4111E-02 1.3235E-02 1.2301E-01 1.2301E-01 -1.1485E-02 A8 -4.8933E-02 2.1013E-04 1.3069E-01 -2.1000E-01 -2.1000E-01 -1.2245E-03 A10 1.0052E-02 -6.2016E-03 -3.5501E-02 6.4941E-02 6.4941E-02 0.0000E+00 A12 -1.1256E-02 -2.7975E-03 3.8362E-03 -1.6673E-02 -1.6673E-02 0.0000E+00 A14 1.9505E-03 4.9328E-04 1.7737E-04 2.5460E-03 2.5460E-03 0.0000E+00 A16 -8.1676E-04 3.3116E-04 -2.8648E-04 1.6000E-03 1.6000E-03 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

[0078] Table 2

[0079] Referring to Table 5, the numerical values ​​of the relevant parameters in this embodiment are respectively shown in the 'Example 1' column in Table 5, and the specific descriptions of the relevant parameters are respectively as follows: 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, D0bs is the outer diameter of the first side surface of the lens barrel auxiliary element, D0bm is the outer diameter of the second side surface of the lens barrel auxiliary element, d1s is the inner diameter of the first side surface of the first spacing element P1; d1m is the inner diameter of the second side surface of the first spacing element P1; D1s is the outer diameter of the first side surface of the first spacing element P1; D1m is the outer diameter of the second side surface of the first spacing element P1; d0s is the inner diameter of the first side end surface of the lens barrel P0; d0m is the inner diameter of the second 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; and, L is the maximum distance from the first side end surface of the lens barrel P0 to the second side end surface of the lens barrel P0 along the optical axis. The units of the above parameters shown in Table 5 are all millimeters (mm), and the above parameters are shown in the structure diagram of the visual system as follows: Figure 1 shown.

[0080] Example 2

[0081] The following reference Figure 3 Describe the visual system according to Example 2 of the present application. Figure 3 A schematic structural diagram of a visual system according to Example 2 of the present application is shown.

[0082] like Figure 3 As shown, in this embodiment, the visual system also includes a lens barrel P0 and the following components, which are arranged in sequence from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2, and a third lens E3, which are assembled in the lens barrel P0; and the visual system also includes an image surface IMG located on the second side of the system. In addition, the first side of the reflective polarizing element RP is attached to the second side of the first lens E1, and the first side of the quarter wave plate QWP is attached to the second side of the reflective polarizing element RP. The spacing element in the visual system includes: a lens barrel auxiliary element P0b located between the inner end surface of the first side of the lens barrel P0 and the first lens E1 and abutting against the first side of the first lens, and a first spacing element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens. In this embodiment, the first side may also be, for example, the human eye side, and the second side may also be, for example, the display side.

[0083] The structure of the visual system of this embodiment is the same as that of the visual system of Embodiment 1, that is, the basic parameter table of the visual system of this embodiment is the same as Table 1, and the high-order coefficient table of the aspheric mirror surface is the same as Table 2.

[0084] The difference between this embodiment and embodiment 1 is that the values ​​of the parameters shown in Table 5 are different. The values ​​of the parameters in this embodiment are shown in the 'Example 2' column in Table 5. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0085] Example 3

[0086] The following reference Figure 4 Describe the visual system according to Example 3 of the present application. Figure 4 A schematic structural diagram of a visual system according to Example 3 of the present application is shown.

[0087] like Figure 4 As shown, in this embodiment, the visual system also includes a lens barrel P0 and the following components, which are arranged in sequence from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2, and a third lens E3, which are assembled in the lens barrel P0; and the visual system also includes an image surface IMG located on the second side of the system. In addition, the first side of the reflective polarizing element RP is attached to the second side of the first lens E1, and the first side of the quarter wave plate QWP is attached to the second side of the reflective polarizing element RP. The spacing element in the visual system includes: a lens barrel auxiliary element P0b located between the inner end surface of the first side of the lens barrel P0 and the first lens E1 and abutting against the first side of the first lens, and a first spacing element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens. In this embodiment, the first side may also be, for example, the human eye side, and the second side may also be, for example, the display side.

[0088] The structure of the visual system of this embodiment is the same as that of the visual system of Embodiment 1, that is, the basic parameter table of the visual system of this embodiment is the same as Table 1, and the high-order coefficient table of the aspheric mirror surface is the same as Table 2.

[0089] The difference between this embodiment and embodiment 1 is also that the values ​​of the parameters shown in Table 5 are different. The values ​​of the parameters in this embodiment are shown in the 'Example 3' column in Table 5. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0090] Example 4

[0091] The following reference Figure 5 Describe the visual system according to Example 4 of the present application. Figure 5 A structural schematic diagram of a visual system according to Example 4 of the present application is shown.

[0092] like Figure 5As shown, in this embodiment, the visual system also includes a lens barrel P0 and the following components, which are arranged in sequence from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2, and a third lens E3, which are assembled in the lens barrel P0; and the visual system also includes an image surface IMG located on the second side of the system. In addition, the first side of the reflective polarizing element RP is attached to the second side of the first lens E1, and the first side of the quarter wave plate QWP is attached to the second side of the reflective polarizing element RP. The spacing element in the visual system includes: a lens barrel auxiliary element P0b located between the inner end surface of the first side of the lens barrel P0 and the first lens E1 and abutting against the first side of the first lens, and a first spacing element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens. In this embodiment, the first side may also be, for example, the human eye side, and the second side may also be, for example, the display side.

[0093] The structure of the visual system of this embodiment is the same as that of the visual system of Embodiment 1, that is, the basic parameter table of the visual system of this embodiment is the same as Table 1, and the high-order coefficient table of the aspheric mirror surface is the same as Table 2.

[0094] The difference between this embodiment and embodiment 1 is that the values ​​of the parameters shown in Table 5 are different. The values ​​of the parameters in this embodiment are shown in the 'Example 4' column in Table 5. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0095] Figure 6 The axial chromatic aberration curves of the visual systems of Example 1, Example 2, Example 3 and Example 4 are shown, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Figure 7 Astigmatism curves of the visual systems of Example 1, Example 2, Example 3, and Example 4 are shown, which represent the meridional field curvature and the sagittal field curvature. Figure 8 The distortion curves of the visual systems of Example 1, Example 2, Example 3 and Example 4 are shown, which represent the distortion magnitude values ​​corresponding to different field angles. Figures 6 to 8 It can be seen that the visual systems provided in Example 1, Example 2, Example 3 and Example 4 can achieve good imaging quality.

[0096] Example 5

[0097] The following reference Fig. 9 Describe the visual system according to Example 5 of the present application. Fig. 9 A schematic diagram of the structure of the visual system according to Example 5 of the present application is shown.

[0098] like Fig. 9As shown, the visual system includes a lens barrel P0 and a first lens E1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2 and a third lens E3, which are arranged in sequence from the first side to the second side along the optical axis. The visual system also includes an image surface IMG located at the second side of the system.

[0099] In this embodiment, the first side surface of the reflective polarizer RP is attached to the second side surface of the first lens E1, and the first side surface of the quarter wave plate QWP is attached to the second side surface of the reflective polarizer RP.

[0100] In this embodiment, the visual system also includes: a barrel auxiliary element P0b, located between the inner end surface of the first side of the barrel P0 and the first lens E1, and the barrel auxiliary element P0b can be disposed against the first side surface of the first lens; and a first spacing element P1, located between the first lens E1 and the second lens E2, and the first spacing element P1 can be disposed against the second side surface of the first lens.

[0101] In this embodiment, the first side may be, for example, a human eye side, and the second side may be, for example, a display side.

[0102] Table 3 shows the basic parameters of the visual system of Example 5, wherein the units of the radius of curvature and thickness / distance are both in millimeters (mm). In this embodiment, the first side surface S2 and the second side surface S3 of the first lens E1, the first side surface S6 of the second lens E2, and the second side surface S9 of the third lens E3 are all aspherical surfaces. Table 4 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 , wherein each aspheric surface shape can be defined by the formula (1) given in the above embodiment 1.

[0103] surface element Surface type Radius of curvature Thickness / distance Refractive Index Abbe number Refraction / Reflection S0 Spherical endless -1290.0000 refraction S1 Spherical endless 12.0000 refraction S2 First lens (E1) Aspheric -500.0000 3.3550 1.546 55.92 refraction S3 Reflective polarizer (RP) Aspheric -109.7362 0.1000 1.502 56.00 refraction S4 Quarter Wave Plate (QWP) Aspheric -109.7362 0.1000 1.502 56.00 refraction S5 Aspheric -109.7362 0.2500 refraction S6 Second lens (E2) Aspheric 1118.8427 0.9396 1.546 55.92 refraction S7 Spherical endless 0.0000 refraction S8 Third lens (E3) Spherical endless 8.3494 1.546 55.92 refraction S9 Aspheric -43.3262 -8.3494 1.546 55.92 reflection S10 Spherical endless 0.0000 refraction S11 Second lens (E2) Spherical endless -0.9396 refraction S12 Aspheric 1118.8427 -0.2500 refraction S13 Quarter Wave Plate (QWP) Aspheric -109.7362 -0.1000 1.502 56.00 refraction S14 Reflective polarizer (RP) Aspheric -109.7362 0.1000 1.502 56.00 reflection S15 Aspheric -109.7362 0.2500 refraction S16 Second lens (E2) Aspheric 1118.8427 0.9396 1.546 55.92 refraction S17 Spherical endless 0.0000 refraction S18 Third lens (E3) Spherical endless 8.3494 1.546 55.92 refraction S19 Aspheric -43.3262 0.8644 refraction S20 Image surface (IMG) Spherical endless 0.0000 refraction

[0104] Table 3

[0105] Coefficient\Surface S2 S3 S6 S9 A4 -9.4583E-01 1.4170E-01 -6.2249E-01 6.3214E-03 A6 -1.9555E-01 5.7186E-02 -3.1748E-02 -1.1485E-02 A8 -1.0082E-01 -4.7677E-03 5.9938E-02 -1.2245E-03 A10 -4.1586E-02 -6.3182E-03 2.7461E-03 0.0000E+00 A12 -1.3268E-02 -6.1732E-04 -5.0228E-03 0.0000E+00 A14 -2.4985E-03 9.3834E-04 4.1308E-03 0.0000E+00 A16 -1.9133E-03 -1.7605E-04 4.9000E-03 0.0000E+00 A18 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

[0106] Table 4

[0107] Referring to Table 5, the relevant parameter values ​​in this embodiment are respectively shown in the 'Embodiment 5' column in Table 5, wherein the specific description of the meaning represented by each parameter is the same as that in the above-mentioned Embodiment 1, and will not be repeated here.

[0108] Example 6

[0109] The following reference Fig.10 Describe the visual system according to Example 6 of the present application. Fig.10 A structural schematic diagram of a visual system according to Example 6 of the present application is shown.

[0110] like Fig.10 As shown, in this embodiment, the visual system also includes a lens barrel P0 and the following components, which are arranged in sequence from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2, and a third lens E3, which are assembled in the lens barrel P0; and the visual system also includes an image surface IMG located on the second side of the system. In addition, the first side of the reflective polarizing element RP is attached to the second side of the first lens E1, and the first side of the quarter wave plate QWP is attached to the second side of the reflective polarizing element RP. The spacing element in the visual system includes: a lens barrel auxiliary element P0b located between the inner end surface of the first side of the lens barrel P0 and the first lens E1 and abutting against the first side of the first lens, and a first spacing element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens. In this embodiment, the first side may also be, for example, the human eye side, and the second side may also be, for example, the display side.

[0111] The structure of the visual system of this embodiment is the same as that of the visual system of Example 5, that is, the basic parameter table of the visual system of this embodiment is the same as Table 3, and the high-order coefficient table of the aspheric mirror surface is the same as Table 4.

[0112] The difference between this embodiment and embodiment 5 is that the values ​​of the parameters shown in Table 5 are different. The values ​​of the parameters in this embodiment are shown in the column 'Example 6' in Table 5. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0113] Example 7

[0114] The following reference Fig.11 Describe the visual system according to Example 7 of the present application. Fig.11 A schematic diagram of the structure of the visual system according to Example 7 of the present application is shown.

[0115] like Fig.11As shown, in this embodiment, the visual system also includes a lens barrel P0 and the following components, which are arranged in sequence from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2, and a third lens E3, which are assembled in the lens barrel P0; and the visual system also includes an image surface IMG located on the second side of the system. In addition, the first side of the reflective polarizing element RP is attached to the second side of the first lens E1, and the first side of the quarter wave plate QWP is attached to the second side of the reflective polarizing element RP. The spacing element in the visual system includes: a lens barrel auxiliary element P0b located between the inner end surface of the first side of the lens barrel P0 and the first lens E1 and abutting against the first side of the first lens, and a first spacing element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens. In this embodiment, the first side may also be, for example, the human eye side, and the second side may also be, for example, the display side.

[0116] The structure of the visual system of this embodiment is the same as that of the visual system of Example 5, that is, the basic parameter table of the visual system of this embodiment is the same as Table 3, and the high-order coefficient table of the aspheric mirror surface is the same as Table 4.

[0117] The difference between this embodiment and embodiment 5 is also that the values ​​of the parameters shown in Table 5 are different. The values ​​of the parameters in this embodiment are shown in the 'Example 7' column in Table 5. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0118] Example 8

[0119] The following reference Fig.12 Describe the visual system according to Example 8 of the present application. Fig.12 A schematic diagram of the structure of the visual system according to Example 8 of the present application is shown.

[0120] like Fig.12As shown, in this embodiment, the visual system also includes a lens barrel P0 and the following components, which are arranged in sequence from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2, and a third lens E3, which are assembled in the lens barrel P0; and the visual system also includes an image surface IMG located on the second side of the system. In addition, the first side of the reflective polarizing element RP is attached to the second side of the first lens E1, and the first side of the quarter wave plate QWP is attached to the second side of the reflective polarizing element RP. The spacing element in the visual system includes: a lens barrel auxiliary element P0b located between the inner end surface of the first side of the lens barrel P0 and the first lens E1 and abutting against the first side of the first lens, and a first spacing element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens. In this embodiment, the first side may also be, for example, the human eye side, and the second side may also be, for example, the display side.

[0121] The structure of the visual system of this embodiment is the same as that of the visual system of Example 5, that is, the basic parameter table of the visual system of this embodiment is the same as Table 3, and the high-order coefficient table of the aspheric mirror surface is the same as Table 4.

[0122] The difference between this embodiment and embodiment 5 is that the values ​​of the parameters shown in Table 5 are different. The values ​​of the parameters in this embodiment are shown in the column 'Example 8' in Table 5. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0123] Fig.13 The axial chromatic aberration curves of the visual systems of Examples 5, 6, 7 and 8 are shown, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig.14 Astigmatism curves of the visual systems of Example 5, Example 6, Example 7 and Example 8 are shown, which represent the meridional field curvature and the sagittal field curvature. Fig.15 The distortion curves of the visual systems of Example 5, Example 6, Example 7 and Example 8 are shown, which represent the distortion magnitude values ​​corresponding to different field angles. Figures 13 to 15 It can be seen that the visual systems provided in Examples 5, 6, 7 and 8 can achieve good imaging quality.

[0124] Parameters / Examples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 d0bs 35.9462 35.7645 36.1027 35.7015 31.2086 31.3827 31.0153 31.2708 d0bm 35.9462 35.7645 36.1027 35.7015 31.2086 31.3827 31.0153 31.2708 D0bs 43.9498 43.9498 43.9498 43.9498 39.2122 39.2122 39.2122 39.2122 D0bm 43.9498 43.9498 43.9498 43.9498 39.2122 39.2122 39.2122 39.2122 d1s 41.1493 40.0056 40.2281 40.4260 38.0921 38.1187 38.2542 38.1946 d1m 41.8769 40.0056 40.2281 40.4260 40.0463 39.9272 39.9907 39.8629 D1s 45.4109 46.6683 46.6683 46.6683 43.2327 42.1033 42.0129 41.9621 D1m 46.0338 46.6683 46.6683 46.6683 43.0327 42.8992 42.7273 43.0782 d0s 34.8391 34.9889 35.6251 35.8013 29.4804 30.1015 30.7581 29.7144 d0m 49.5361 49.7288 49.6361 49.7517 48.7045 48.8518 48.9485 48.7966 D0s 45.9022 46.7772 46.6581 45.1452 41.4896 41.8704 42.9299 40.8678 D0m 51.7361 51.9361 52.0361 51.9071 50.9045 51.0518 50.9474 50.9953 L 11.3029 11.3029 11.4529 11.5529 11.2048 11.0775 11.1775 11.1775

[0125] Table 5

[0126] In addition, in Examples 1 to 8, the combined focal length fz of the first lens, the reflective polarizing element and the quarter-wave plate, the combined focal length f23 of the second lens and the third lens, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the entrance pupil diameter EPD of the visual system, the effective focal length f of the visual system, the distance TD from the first side surface of the first lens to the second side surface of the third lens on 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 respectively shown in Table 6 below.

[0127]

[0128]

[0129] Table 6

[0130] And, Examples 1 to 8 respectively satisfy the conditions shown in Table 7 below.

[0131]

[0132] Table 7

[0133] The present application also provides an imaging device, which is provided with an electronic photosensitive element for imaging, and the electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the visual system described above.

[0134] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of protection involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the present application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. A visual system, characterized in that: It includes a lens barrel and a lens group and a spacer element group assembled in the lens barrel. The lens group includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, and a third lens arranged in sequence from the first side to the second side along the optical axis. Among them, The first lens has a positive optical power. The second lens has a positive or negative optical power. The third lens has a positive optical power. The spacer element group includes: a lens barrel auxiliary element located between the inner end face on the first side of the lens barrel and the first lens and abutted against the first side face of the first lens; a first spacer element located between the first lens and the second lens and abutted against the second side face of the first lens. The visual system satisfies: 1.8 < d0s / f < 2.3, and 0.1 < (d0bs + d0bm) / |R1| < 0.95, where d0s is the inner diameter of the end face on the first side of the lens barrel, f is the effective focal length of the visual system, d0bs is the inner diameter of the first side face of the lens barrel auxiliary element, d0bm is the inner diameter of the second side face of the lens barrel auxiliary element, and R1 is the curvature radius of the first side face of the first lens.

2. The visual system according to claim 1, characterized in that: The curvature radius R2 of the second side face of the first lens and the inner diameter d1s of the first side face of the first spacer element satisfy: -3.1 < R2 / d1s < -2.

7.

3. The visual system according to claim 1, characterized in that: The outer diameter D1m of the second side face of the first spacer element, the inner diameter d1m of the second side face of the first spacer element, and the central thickness CT2 of the second lens on the optical axis satisfy: 2.9 < (D1m - d1m) / CT2 < 5.

1.

4. The visual system according to claim 1, characterized in that: The distance TD on the optical axis from the first side face of the first lens to the second side face of the third lens and the maximum distance L along the optical axis from the end face on the first side of the lens barrel to the end face on the second side of the lens barrel satisfy: 1.1 < TD / L < 1.

5.

5. The visual system according to claim 1, characterized in that: The effective focal length f3 of the third lens and the inner diameter d0m of the end face on the second side of the lens barrel satisfy: 1.4 < f3 / d0m < 1.

8.

6. The visual system according to claim 1, characterized in that: The combined focal length f23 of the second lens and the third lens and the outer diameter D1s of the first side face of the first spacer element satisfy: 1.7 < f23 / D1s < 2.

5.

7. The visual system according to any one of claims 1 to 6, characterized in that: The outer diameter D0bs of the first side face of the lens barrel auxiliary element and the entrance pupil diameter EPD of the visual system satisfy: 1.4 < (D0bs - d0bs) / EPD < 1.

8.

8. The visual system according to any one of claims 1 to 6, characterized in that: The combined focal length fz of the first lens, the reflective polarizing element, and the quarter-wave plate and the inner diameter d1s of the first side face of the first spacer element and the inner diameter d1m of the second side face of the first spacer element satisfy: 1.0 < fz / (d1s + d1m) < 3.

3.

9. The visual system according to any one of claims 1 to 6, characterized in that: The effective focal length f1 of the first lens and the outer diameter D0bm of the second side face of the lens barrel auxiliary element satisfy: 1.0 < f1 / (d0bm + D0bm) < 3.

7.

10. The visual system according to any one of claims 1 to 6, characterized in that: The outer diameter D0m of the end face on the second side of the lens barrel, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 5.2 <D0m / (CT2+CT3)<5.9。 11. The visual system according to any one of claims 1 to 6, characterized in that: The outer diameter D0s of the first side end surface of the lens barrel satisfies: 1.1 <D0s / d0s<1.6。 12. The visual system according to any one of claims 1 to 6, characterized in that: The center thickness CT1 of the first lens on the optical axis, the center thickness CTR of the reflective polarizing element on the optical axis, the center thickness CTQ of the quarter-wave plate on the optical axis and the inner diameter d1s of the first side surface of the first spacing element satisfy: 0.4<(CT1+CTR+CTQ) / (d1s-d0bs)<1.

7.

13. A VR device, comprising the visual system according to any one of claims 1 to 12, wherein: The first side is a human eye side, and the second side is a display side.

Images