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, and a first lens, a reflective polarizing element, a quarter-wave plate, a second lens and a third lens which are assembled in the lens barrel and are sequentially arranged from a first side to a second side along an optical axis, and the first lens, the second lens and the third lens all have positive focal power or negative focal power; a lens barrel auxiliary element is arranged between the inner end face of the first side of the lens barrel and the first 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; the effective focal length f, the entrance pupil diameter EPD and the maximum field angle FOV of the visual system respectively meet 2.8 lt; f / EPDlt; 3.3 mm < lt > and 15.8 mm < lt >; f * tan (FOV / 2) lt; the axial distance TD from the first side surface of the first lens to the second side surface of the third lens, the maximum thickness CP1 of the first spacing element, the axial distance EP12 from the second side surface of the first spacing element to the first side surface of the second spacing element, and the maximum thickness CP2 of the second spacing element satisfy 3.1 lt. TD / (CP1 + EP12 + CP2) lt; and 6.7.

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 introduction of the concept of "metaverse", people's entertainment methods have become increasingly diverse, among which AR / VR (augmented reality / virtual reality) and other devices for human-computer interaction have developed rapidly and are increasingly popular. However, VR lenses still have problems such as large size, heavy weight, and easy to cause dizziness, which need to be solved urgently. Therefore, the miniaturization, lightweighting and improvement of imaging quality of lenses have become several aspects that need to be focused on and improved in order to improve consumer experience.

[0003] In order to better solve the above-mentioned problems existing in the current VR lenses and achieve a better user experience, technical personnel in this field are committed to providing a catadioptric optical system including three lenses, which can leave more design space for optical design, and further optimize the structural design, including the lens barrel, lenses and spacer elements, and through reasonable design of the film sticking method and the use of lens gluing and other means to make the lens structure more compact and lightweight. At the same time, under the premise of ensuring the assembly of the system, the volume and mass of the lens can be effectively compressed, and the imaging quality of the system can be improved, so as to better enhance the consumer experience. Utility Model Content

[0004] On the one hand, 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 or negative optical power; the second lens has a positive or negative optical power; the third lens has a positive or negative 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; a first spacer element located between the first lens and the second lens; a second spacer element located between the second lens and the third lens; the visual system satisfies: 2.8 < f / EPD < 3.3; 15.8 mm < f×tan(FOV / 2) < 17.8 mm; and 3.1 < TD / (CP1 + EP12 + CP2) < 6.7, where f is the effective focal length of the visual system, EPD is the entrance pupil diameter of the visual system, FOV is the maximum field of view angle of the visual system, TD is the distance on the optical axis from the first side face of the first lens to the second side face of the third lens, CP1 is the maximum thickness of the first spacer element, EP12 is the distance on the optical axis from the second side face of the first spacer element to the first side face of the second spacer element, and CP2 is the maximum thickness of the second spacer element.

[0005] In one embodiment, the inner diameter d0bs of the first side face of the lens barrel auxiliary element and the effective focal length f of the visual system satisfy: 1.6 < d0bs / f < 2.4.

[0006] In one embodiment, the central thickness CT1 of the first lens on the optical axis and the inner diameter d0bm of the second side face of the lens barrel auxiliary element satisfy: 0 < CT1 / d0bm < 0.2.

[0007] In one embodiment, the inner diameter d2s of the first side face of the second spacer element and the inner diameter d1m of the second side face of the first spacer element satisfy: 1.0 < d2s / d1m < 1.2.

[0008] In one embodiment, the Abbe number V2 of the second lens, the Abbe number V1 of the first lens, the outer diameter D1s of the first side face of the first spacer element, and the inner diameter d1s of the first side face of the first spacer element satisfy: 0.4 < (V2 / V1)×(D1s / d1s) < 2.8.

[0009] In one embodiment, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the outer diameter D2m of the second side surface of the second spacer element, and the inner diameter d2m of the second side surface of the second spacer element satisfy: 1.0<(N2 / N3)×(D2m / d2m)<1.3.

[0010] In one embodiment, the inner diameter d0s of the first side end surface of the lens barrel and the effective focal length f1 of the first lens satisfy: -0.2 <d0s / f1<0.4。

[0011] In one embodiment, the central thickness CT3 of the third lens on the optical axis and the inner diameter d0m of the second side end surface of the lens barrel satisfy: 0.05 <CT3 / d0m<0.2。

[0012] In one embodiment, the combined focal length f23 of the second lens and the third lens and the outer diameter D2s of the first side surface of the second spacing element satisfy: 1.6 <f23 / D2s<3.1。

[0013] In one embodiment, an outer diameter D0bs of the first side surface of the barrel auxiliary element, an outer diameter D0bm of the second side surface of the barrel auxiliary element, and a curvature radius R1 of the first side surface of the first lens satisfy: 1.0<(D0bs+D0bm) / |R1|<3.1.

[0014] In one embodiment, the outer diameter D0m of the second side end surface of the lens barrel and the outer diameter D0s of the first side end surface of the lens barrel satisfy the following conditions: 1.1 <D0m / D0s<1.3。

[0015] In one embodiment, a sum ΣCT of the center thicknesses of the first lens, the second lens, and the third lens on the optical axis and a maximum height L of the lens barrel along the optical axis satisfy the following: 1.0<ΣCT / L<1.4.

[0016] On the other hand, 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 or negative optical power; the second lens has a positive or negative optical power; the third lens has a positive or negative optical power; the spacer element group includes: a lens barrel auxiliary element located between the inner end surface of the first side of the lens barrel and the first lens; a first spacer element located between the first lens and the second lens; a second spacer element located between the second lens and the third lens; the visual system satisfies: 2.8 < f / EPD < 3.3; 15.8 mm < f×tan(FOV / 2) < 17.8 mm; and 1.0 < d2s / d1m < 1.2, where f is the effective focal length of the visual system, EPD is the entrance pupil diameter of the visual system, FOV is the maximum field of view angle of the visual system, d2s is the inner diameter of the first side surface of the second spacer element, and d1m is the inner diameter of the second side surface of the first spacer element.

[0017] In one embodiment, the inner diameter d0bs of the first side surface of the lens barrel auxiliary element and the effective focal length f of the visual system satisfy: 1.6 < d0bs / f < 2.4.

[0018] In one embodiment, the distance TD on the optical axis from the first side surface of the first lens to the second side surface of the third lens, the maximum thickness CP1 of the first spacer element, the distance EP12 on 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 CP2 of the second spacer element satisfy: 3.1 < TD / (CP1 + EP12 + CP2) < 6.7.

[0019] In one embodiment, the central thickness CT1 of the first lens on the optical axis and the inner diameter d0bm of the second side surface of the lens barrel auxiliary element satisfy: 0 < CT1 / d0bm < 0.2.

[0020] In one embodiment, the Abbe number V2 of the second lens, the Abbe number V1 of the first lens, 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 satisfy: 0.4 < (V2 / V1)×(D1s / d1s) < 2.8.

[0021] In one embodiment, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the outer diameter D2m of the second side surface of the second spacer element, and the inner diameter d2m of the second side surface of the second spacer element satisfy: 1.0<(N2 / N3)×(D2m / d2m)<1.3.

[0022] In one embodiment, the inner diameter d0s of the first side end surface of the lens barrel and the effective focal length f1 of the first lens satisfy: -0.2 <d0s / f1<0.4。

[0023] In one embodiment, the central thickness CT3 of the third lens on the optical axis and the inner diameter d0m of the second side end surface of the lens barrel satisfy: 0.05 <CT3 / d0m<0.2。

[0024] In one embodiment, the combined focal length f23 of the second lens and the third lens and the outer diameter D2s of the first side surface of the second spacing element satisfy: 1.6 <f23 / D2s<3.1。

[0025] In one embodiment, an outer diameter D0bs of the first side surface of the barrel auxiliary element, an outer diameter D0bm of the second side surface of the barrel auxiliary element, and a curvature radius R1 of the first side surface of the first lens satisfy: 1.0<(D0bs+D0bm) / |R1|<3.1.

[0026] In one embodiment, the outer diameter D0m of the second side end surface of the lens barrel and the outer diameter D0s of the first side end surface of the lens barrel satisfy the following conditions: 1.1 <D0m / D0s<1.3。

[0027] In one embodiment, a sum ΣCT of the center thicknesses of the first lens, the second lens, and the third lens on the optical axis and a maximum height L of the lens barrel along the optical axis satisfy the following: 1.0<ΣCT / L<1.4.

[0028] On the other hand, the present application also provides a VR device, which may include a visual system provided by any one of the above-mentioned embodiments, wherein the first side is a human eye side, and the second side is a display side.

[0029] The visual system disclosed in this 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 the lens barrel. Among them, the first lens, the second lens, and the third lens can each have a positive optical power or a negative optical power; a lens barrel auxiliary element is provided between the front end (the inner end face of the first side) of the lens barrel and the first lens, and a first spacer element is provided between the first lens and the second lens; a second spacer element is provided between the second lens and the third lens; by reasonably configuring the visual system and controlling the effective focal length f of the visual system and the entrance pupil diameter EPD of the visual system to satisfy the conditional formula 2.8 < f / EPD < 3.3, and on the premise that the effective focal length f of the visual system and the maximum field of view angle FOV of the visual system satisfy the conditional formula 15.8 mm < f × tan(FOV / 2) < 17.8 mm, controlling the distance TD on the optical axis from the first side of the first lens to the second side of the third lens, the maximum thickness CP1 of the first spacer element, the distance EP12 on the optical axis from the second side of the first spacer element to the first side of the second spacer element, and the maximum thickness CP2 of the second spacer element to satisfy the conditional formula 3.1 < TD / (CP1 + EP12 + CP2) < 6.7, the thicknesses of the first spacer element and the second spacer element of the module can be reasonably distributed. On the premise of ensuring system assembly, it is avoided that the thicknesses of the two are too thin to be machinable; at the same time, the system structure can be made more compact, effectively reducing the volume and weight of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In combination with the drawings, through the following detailed description of non-limiting embodiments, other features, objectives, and advantages of this application will become more obvious. In the drawings:

[0031] Figure 1 shows a schematic diagram of the structure and some parameters of the visual system according to an exemplary embodiment of this application;

[0032] Figure 2 shows a schematic diagram of the structure of the visual system according to Embodiment 1 of this application;

[0033] Figure 3 shows a schematic diagram of the structure of the visual system according to Embodiment 2 of this application;

[0034] Figure 4 、 Figure 5 and Figure 6 respectively show the axial chromatic aberration curve, astigmatism curve, and distortion curve of the visual systems of Embodiment 1 and Embodiment 2;

[0035] Figure 7 shows a schematic diagram of the structure of the visual system according to Embodiment 3 of this application;

[0036] Figure 8A schematic diagram of the structure of a visual system according to Embodiment 4 of the present application is shown;

[0037] Fig. 9 , Fig.10 and Fig.11 The axial chromatic aberration curve, astigmatism curve and distortion curve of the visual system of Example 3 and Example 4 are respectively shown;

[0038] Fig.12 A schematic diagram of the structure of a visual system according to Embodiment 5 of the present application is shown;

[0039] Fig.13 A schematic diagram of the structure of a visual system according to Example 6 of the present application is shown;

[0040] Fig.14 , Fig.15 and Fig.16 The axial chromatic aberration curve, astigmatism curve and distortion curve of the visual system of Example 5 and Example 6 are respectively shown;

[0041] Fig.17 A schematic diagram of the structure of a visual system according to Embodiment 7 of the present application is shown;

[0042] Fig.18 A schematic diagram of the structure of a visual system according to Embodiment 8 of the present application is shown; and

[0043] Fig.19 , Fig. 20 and Fig.21 The axial chromatic aberration curve, astigmatism curve and distortion curve of the visual system of Example 7 and Example 8 are shown respectively. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] The features, principles and other aspects of the present application are described in detail below.

[0052] 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.

[0053] 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.

[0054] In an exemplary embodiment, the first lens may have a positive optical power or a negative optical power; the second lens may have a positive optical power or a negative optical power; the third lens may have a positive optical power or a negative optical power.

[0055] 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, 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. It can be understood that the surface of each element or structure in the visual system that is close to the first side and far from the second side is the first side surface of the element, and the surface of each element that is close to the second side and far from the first side is the second side surface of the element.

[0056] In an exemplary embodiment, the visual system of the present application may satisfy the conditional formula 2.8 < f / EPD < 3.3, where f is the effective focal length of the visual system and EPD is the entrance pupil diameter of the visual system.

[0057] In an exemplary embodiment, the visual system of the present application may satisfy the conditional formula 15.8 mm < f × tan(FOV / 2) < 17.8 mm, where f is the effective focal length of the visual system and FOV is the maximum field of view angle of the visual system.

[0058] In an exemplary embodiment, the visual system of the present application may satisfy the conditional formula 3.1 < TD / (CP1 + EP12 + CP2) < 6.7, 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, CP1 is the maximum thickness (in the optical axis direction) of the first spacer element, EP12 is the distance on 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 (in the optical axis direction) of the second spacer element.

[0059] 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 the lens barrel. Among them, the first lens, the second lens, and the third lens can each have a positive optical power or a negative optical power; a lens barrel auxiliary element is provided between the front end (the inner end face of the first side) of the lens barrel and the first lens, and a first spacer element is provided between the first lens and the second lens; a second spacer element is provided between the second lens and the third lens; by reasonably configuring the visual system and controlling that the effective focal length f of the visual system and the entrance pupil diameter EPD of the visual system satisfy the conditional formula 2.8 < f / EPD < 3.3, and on the premise that the effective focal length f of the visual system and the maximum field of view angle FOV of the visual system satisfy the conditional formula 15.8 mm < f × tan(FOV / 2) < 17.8 mm, controlling 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, the maximum thickness CP1 of the first spacer element, the distance EP12 on the optical axis from the second side face of the first spacer element to the first side face of the second spacer element, and the maximum thickness CP2 of the second spacer element satisfy the conditional formula 3.1 < TD / (CP1 + EP12 + CP2) < 6.7, the thicknesses of the first spacer element and the second spacer element of the module can be reasonably allocated. On the premise of ensuring system assembly, it is possible to avoid the thicknesses of the two being too thin and not being processable; at the same time, the system structure can be made more compact, effectively reducing the volume and weight of the system.

[0060] In an exemplary embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The visual system can be used in various VR display devices, for example.

[0061] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.6 < d0bs / f < 2.4, where d0bs is the inner diameter of the first side face of the lens barrel auxiliary element and f is the effective focal length of the visual system. By controlling the ratio of the inner diameter of the first side face of the lens barrel auxiliary element to the effective focal length of the visual system within this range, it is possible to prevent the ratio of the inner diameter of the lens barrel auxiliary element to the effective focal length of the system from being too large, resulting in excessive incident light and generating stray light; at the same time, it is possible to prevent the ratio of the two from being too small, blocking light and causing the field of view angle of the system to be too small.

[0062] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 0 < CT1 / d0bm < 0.2, where CT1 is the central thickness of the first lens on the optical axis and d0bm is the inner diameter of the second side face of the lens barrel auxiliary element. By controlling the ratio of the central thickness of the first lens on the optical axis to the inner diameter of the second side face of the lens barrel auxiliary element within this range, the processability of the first lens and the lens barrel auxiliary element can be ensured.

[0063] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.0 < d2s / d1m < 1.2, where d2s is the inner diameter of the first side surface of the second spacer element, and d1m is the inner diameter of the second side surface of the first spacer element. By controlling the ratio of the inner diameter of the first side surface of the second spacer element to the inner diameter of the second side surface of the first spacer element within this range, it can be ensured that there is sufficient overlap between the assembly support surfaces of the two in the projection direction, realizing effective support for the second lens.

[0064] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 0.4 < (V2 / V1) × (D1s / d1s) < 2.8, where V2 is the Abbe number of the second lens, V1 is the Abbe number of the first lens, 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. By controlling the Abbe number of the second lens, the Abbe number of the first lens, the outer diameter of the first side surface of the first spacer element, and the inner diameter of the first side surface of the first spacer element to satisfy the conditional formula 0.4 < (V2 / V1) × (D1s / d1s) < 2.8, it can ensure the machinability of the first spacer element and, at the same time, ensure the supporting effect of the first spacer element.

[0065] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.0 < (N2 / N3) × (D2m / d2m) < 1.3, where N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, D2m is the outer diameter of the second side surface of the second spacer element, and d2m is the inner diameter of the second side surface of the second spacer element. By controlling the refractive index of the second lens, the refractive index of the third lens, the outer diameter of the second side surface of the second spacer element, and the inner diameter of the second side surface of the second spacer element to satisfy the conditional formula 1.0 < (N2 / N3) × (D2m / d2m) < 1.3, it can ensure the machinability of the second spacer element and, at the same time, ensure the supporting effect of the second spacer element.

[0066] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula -0.2 < d0s / f1 < 0.4, where d0s is the inner diameter of the first side end face of the lens barrel (the end face or surface closest to the first side on the outside of the lens barrel), and f1 is the effective focal length of the first lens. By reasonably controlling the ratio of the inner diameter of the first side end face of the lens barrel to the effective focal length of the first lens, it is beneficial to ensure the machinability of the lens barrel and the first lens.

[0067] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 0.05 < CT3 / d0m < 0.2, where CT3 is the central thickness of the third lens on the optical axis, and d0m is the inner diameter of the second side end face of the lens barrel (the end face or surface closest to the second side outside the lens barrel). By reasonably controlling the ratio of the central thickness of the third lens on the optical axis to the inner diameter of the second side end face of the lens barrel, it is beneficial to ensure the processability of the third lens and the lens barrel.

[0068] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.6 < f23 / D2s < 3.1, where f23 is the combined focal length of the second lens and the third lens, and D2s is the outer diameter of the first side face of the second spacer element. By reasonably controlling the ratio of the combined focal length of the second lens and the third lens to the outer diameter of the first side face of the second spacer element, the processability of the second spacer element can be ensured.

[0069] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.0 < (D0bs + D0bm) / |R1| < 3.1, where D0bs is the outer diameter of the first side face of the lens barrel auxiliary element, D0bm is the outer 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. By controlling the outer diameter of the first side face of the lens barrel auxiliary element, the outer diameter of the second side face of the lens barrel auxiliary element, and the curvature radius of the first side face of the first lens to satisfy the conditional formula 1.0 < (D0bs + D0bm) / |R1| < 3.1, not only can the processability of the lens barrel auxiliary element be ensured, but also the supporting effect of the lens barrel auxiliary element can be ensured.

[0070] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.1 < D0m / D0s < 1.3, where D0m is the outer diameter of the second side end face of the lens barrel, and D0s is the outer diameter of the first side end face of the lens barrel. By reasonably controlling the ratio of the outer diameter of the second side end face of the lens barrel to the outer diameter of the first side end face of the lens barrel, the size and shape trend of the lens barrel can be controlled, avoiding too large a drop in the shape trend from the first side surface to the second side surface of the lens barrel, which affects the processability of the lens barrel, and at the same time avoiding too small a drop in the shape trend from the first side surface to the second side surface of the lens barrel, which restricts the inner diameter of the lens barrel and thus affects the outer diameter of the lens, increasing the difficulty of lens design and processing.

[0071] In an exemplary embodiment, the visual system of the present application can satisfy the condition 1.0 < ∑CT / L < 1.4, where ∑CT is the sum of the central thicknesses of the first lens, the second lens, and the third lens on the optical axis, and L is the maximum height of the lens barrel along the optical axis direction. By controlling the ratio of the sum of the central thicknesses of the first lens, the second lens, and the third lens on the optical axis to the maximum height of the lens barrel along the optical axis within this range, ensuring that the value of ∑CT is greater than the value of L, the maximum height of the lens barrel along the optical axis can be defined, achieving the maximum compression of the module thickness; at the same time, it can avoid the maximum height of the lens barrel along the optical axis being too small, causing the lens to protrude too much beyond the outer shape of the lens barrel, and controlling the risk of the lens being scratched and soiled.

[0072] In an exemplary embodiment, the visual system of the present application may include at least one aperture stop. The aperture stop can restrict 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.

[0073] 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.

[0074] 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 lens barrel, where the first lens, the second lens, and the third lens can each have a positive or negative optical power; and arranging a lens barrel auxiliary element between the front end (the inner end surface of the first side) of the lens barrel and the first lens, a first spacer element between the first lens and the second lens, and a second spacer element between the second lens and the third lens; while controlling the effective focal length f of the visual system and the entrance pupil diameter EPD of the visual system to satisfy the condition 2.8 < f / EPD < 3.3, and the effective focal length f of the visual system and the maximum field of view FOV of the visual system to satisfy the condition 15.8mm < f×tan(FOV / 2) < 17.8mm, on the premise of this, controlling the distance TD on the optical axis from the first side surface of the first lens to the second side surface of the third lens, the maximum thickness CP1 of the first spacer element, the distance EP12 on 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 CP2 of the second spacer element to satisfy the condition 3.1 < TD / (CP1 + EP12 + CP2) < 6.7, the thicknesses of the first spacer element and the second spacer element of the module can be reasonably allocated. On the premise of ensuring the system assembly, it can avoid the thicknesses of the two being too thin and not having processability; at the same time, the system structure can be made more compact, effectively reducing the volume and weight of the system.

[0075] On the other hand, for the visual system according to the above-described embodiment of the present application, by providing 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 lens barrel, wherein the first lens, the second lens, and the third lens can each have a positive or negative optical power; and providing a lens barrel auxiliary element located between the front end (the inner end face of the first side) of the lens barrel and the first lens, 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; while controlling the effective focal length f of the visual system and the entrance pupil diameter EPD of the visual system to satisfy the conditional expression 2.8 < f / EPD < 3.3, and the effective focal length f of the visual system and the maximum field of view FOV of the visual system to satisfy the conditional expression 15.8 mm < f × tan(FOV / 2) < 17.8 mm, controlling the inner diameter d2s of the first side of the second spacer element and the inner diameter d1m of the second side of the first spacer element to satisfy the conditional expression 1.0 < d2s / d1m < 1.2 can ensure that there is sufficient overlap in the projection direction between the assembly support surfaces of the first spacer element and the second spacer element, and can effectively support the second lens; at the same time, it can help make the system structure more compact and is conducive to reducing the volume and weight of the system.

[0076] On the other hand, for the visual system according to the above-described embodiment of the present application, by providing 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 lens barrel, wherein the first lens, the second lens, and the third lens can each have a positive or negative optical power; and providing a lens barrel auxiliary element located between the front end (the inner end face of the first side) of the lens barrel and the first lens, 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; while controlling the inner diameter d0bs of the first side of the lens barrel auxiliary element and the effective focal length f of the visual system to satisfy the conditional expression 1.6 < d0bs / f < 2.4, it is possible to prevent the ratio of the inner diameter of the lens barrel auxiliary element to the effective focal length of the system from being too large, resulting in excessive incident light and generating stray light; at the same time, it can prevent the ratio from being too small, blocking light and causing the field of view of the system to be too small; which is conducive to improving the optical performance of the system.

[0077] On the other hand, for the visual system according to the above embodiments 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 assembled in the lens barrel and arranged in sequence along the optical axis from the first side to the second side, wherein the first lens, the second lens, and the third lens can each have a positive or negative optical power; and arranging a lens barrel auxiliary element between the front end (the inner end surface of the first side) of the lens barrel and the first lens, a first spacer element between the first lens and the second lens, and a second spacer element between the second lens and the third lens; at the same time, controlling the outer diameter D0m of the second side end surface of the lens barrel and the outer diameter D0s of the first side end surface of the lens barrel to satisfy the conditional formula 1.1 < D0m / D0s < 1.3, the size and the shape trend of the lens barrel can be controlled, avoiding too large a drop in the shape trend from the first side surface to the second side surface of the lens barrel, which is beneficial to ensuring the processability of the lens barrel; at the same time, avoiding too small a drop in the shape trend from the first side surface to the second side surface of the lens barrel, avoiding restricting the inner diameter size of the lens barrel and thus affecting the outer diameter of the lens, and avoiding increasing the difficulty of lens design and processing.

[0078] In addition, the present application also provides a VR device, which may include the visual system provided in any one of the above embodiments, wherein the first side is the human eye side and the second side is the display side. The VR device can have at least one beneficial effect such as miniaturization, light weight, and high imaging quality, and can enable the user to obtain a better application experience.

[0079] The following further describes specific embodiments of the visual system applicable to the above embodiments with reference to the drawings.

[0080] Example 1

[0081] The following refers to Figure 2 Describe the visual system according to Embodiment 1 of the present application. Figure 2 The structural schematic diagram of the visual system according to Embodiment 1 of the present application is shown.

[0082] As Figure 2 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 to the second side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, and a third lens E3. The visual system also includes an image plane IMG on the second side of the system.

[0083] In this embodiment, the first side surface (the surface close to the first side and far 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 far 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.

[0084] 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; a first spacing element P1, located between the first lens E1 and the second lens E2; and a second spacing element P2, located between the second lens E2 and the third lens E3.

[0085] 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.

[0086] 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).

[0087] 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 62.1320 2.4847 1.546 55.92 refraction S3 Reflective polarizer (RP) Spherical endless 0.1000 1.502 56.00 refraction S4 Quarter Wave Plate (QWP) Spherical endless 0.1000 1.502 56.00 refraction S5 Spherical endless 0.3184 refraction S6 Second lens (E2) Aspheric 486.3949 0.6000 1.645 23.52 refraction S7 Aspheric 48.0118 0.2260 refraction S8 Third lens (E3) Aspheric 44.7715 9.3206 1.546 55.92 refraction S9 Aspheric -60.5294 -9.3206 1.546 55.92 reflection S10 Aspheric 44.7715 -0.2260 refraction S11 Second lens (E2) Aspheric 48.0118 -0.6000 refraction S12 Aspheric 486.3949 -0.3184 refraction S13 Quarter Wave Plate (QWP) Spherical endless -0.1000 1.502 56.00 refraction S14 Reflective polarizer (RP) Spherical endless 0.1000 1.502 56.00 reflection S15 Spherical endless 0.3184 refraction S16 Second lens (E2) Aspheric 486.3949 0.6000 1.645 23.52 refraction S17 Aspheric 48.0118 0.2260 refraction S18 Third lens (E3) Aspheric 44.7715 9.3206 1.546 55.92 refraction S19 Aspheric -60.5294 0.8662 refraction S20 Image surface (IMG) Spherical endless 0.0000 refraction

[0088] In Embodiment 1, the first side surface S2 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:

[0089]

[0090] 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 .

[0091] Coefficient\Surface S2 S6 S7 S8 S9 A4 -6.1153E-01 -6.0641E-01 -1.0827E+00 -1.6093E+00 4.2211E-03 A6 -3.3166E-01 2.6268E-01 -2.2629E-01 -1.2201E-01 -1.3171E-02 A8 8.0580E-03 -7.4653E-02 -5.0583E-02 1.8394E-02 -1.4171E-03 A10 -1.1441E-02 8.7985E-02 5.2634E-02 -3.2984E-02 0.0000E+00 A12 -2.5244E-03 -2.9213E-02 -2.9721E-02 1.2357E-02 0.0000E+00 A14 8.2930E-03 1.9815E-03 1.0318E-02 -1.0253E-02 0.0000E+00 A16 1.6853E-03 -7.5513E-04 5.9363E-04 1.6463E-03 0.0000E+00 A18 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

[0092] Table 2

[0093] Referring to Table 9, the values ​​of the relevant parameters in this embodiment are respectively shown in the 'Example 1' column of Table 9, 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; d2s is the inner diameter of the first side surface of the second spacing element P2; d2m is the inner diameter of the second side of the second spacing element P2; D2s is the outer diameter of the first side of the second spacing element P2; D2m is the outer diameter of the second side of the second spacing 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 outer diameter of the second side end face of the lens barrel P0; CP1 is the maximum thickness of the first spacing element P1 along the optical axis; EP12 is the distance from the second side of the first spacing element P1 to the first side of the second spacing element P2 on the optical axis, CP2 is the maximum thickness of the second spacing element P2 along the optical axis; and, L is the maximum height of the lens barrel P0 along the optical axis. The units of the above parameters shown in Table 9 are all millimeters (mm), and the above parameters are schematically shown in the structural diagram of the visual system as follows Figure 1 shown.

[0094] Example 2

[0095] 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.

[0096] like Figure 3As 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 elements in the visual system also include: 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, a first spacing element P1 located between the first lens E1 and the second lens E2, and a second spacing element P2 located between the second lens E2 and the third lens E3. 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.

[0097] 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.

[0098] The difference between this embodiment and embodiment 1 is that the values ​​of the parameters shown in Table 9 are different. The values ​​of the parameters in this embodiment are shown in the 'Example 2' column in Table 9. 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.

[0099] Figure 4 The axial chromatic aberration curves of the visual systems of Example 1 and Example 2 are shown, which represent the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Figure 5 Astigmatism curves of the visual systems of Example 1 and Example 2 are shown, which represent the meridional field curvature and the sagittal field curvature. Figure 6 The distortion curves of the visual systems of Example 1 and Example 2 are shown, which represent the distortion values ​​corresponding to different field angles. Figures 4 to 6 It can be seen that the visual systems provided in Example 1 and Example 2 can achieve good imaging quality.

[0100] Example 3

[0101] The following reference Figure 7 Describe the visual system according to Example 3 of the present application. Figure 7 A structural schematic diagram of a visual system according to Example 3 of the present application is shown.

[0102] like Figure 7As shown, in this embodiment, 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.

[0103] In this embodiment, the first side surface of the reflective polarizing element 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 polarizing element RP.

[0104] 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; a first spacing element P1, located between the first lens E1 and the second lens E2; and a second spacing element P2, located between the second lens E2 and the third lens E3.

[0105] 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.

[0106] Table 3 shows the basic parameters of the visual system of Example 3, wherein the units of the radius of curvature and thickness / distance are all in millimeters (mm). In this embodiment, the first side surface S2 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. 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, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 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.

[0107]

[0108]

[0109] Table 3

[0110] Coefficient\Surface S2 S6 S7 S8 S9 A4 -7.7832E-02 -5.2647E-01 -2.6318E-01 -6.2284E-01 6.3214E-03 A6 -8.0278E-02 1.7378E-02 1.4742E-01 1.6363E-01 -1.1485E-02 A8 -4.4280E-02 1.4687E-03 -2.4382E-01 -1.1425E-01 -1.2245E-03 A10 1.4286E-02 -5.6363E-04 4.3098E-02 1.3515E-02 0.0000E+00 A12 -4.7680E-03 -5.7278E-03 -4.1613E-03 6.2756E-03 0.0000E+00 A14 -5.9445E-04 -2.4342E-03 -1.4102E-02 -5.2626E-03 0.0000E+00 A16 -3.2749E-04 4.0963E-04 3.0397E-03 1.3959E-03 0.0000E+00 A18 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

[0111] Table 4

[0112] Referring to Table 9, the relevant parameter values ​​in this embodiment are respectively shown in the 'Embodiment 3' column in Table 9, 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.

[0113] Example 4

[0114] The following reference Figure 8 Describe the visual system according to Example 4 of the present application. Figure 8 A schematic structural diagram of a visual system according to Example 4 of the present application is shown.

[0115] like Figure 8 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 elements in the visual system also include: 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, a first spacing element P1 located between the first lens E1 and the second lens E2, and a second spacing element P2 located between the second lens E2 and the third lens E3. 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 3, 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 3 is that the values ​​of the parameters shown in Table 9 are different. The values ​​of the parameters in this embodiment are shown in the 'Example 4' column in Table 9. 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] Fig. 9 The axial chromatic aberration curves of the visual systems of Example 3 and Example 4 are shown, which represent the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig.10 Astigmatism curves of the visual systems of Example 3 and Example 4 are shown, which represent the meridional field curvature and the sagittal field curvature. Fig.11 The distortion curves of the visual systems of Example 3 and Example 4 are shown, which represent the distortion values ​​corresponding to different field angles. Figures 9 to 11 It can be seen that the visual systems provided in Examples 3 and 4 can achieve good imaging quality.

[0119] Example 5

[0120] The following reference Fig.12Describe the visual system according to Example 5 of the present application. Fig.12 A schematic diagram of the structure of the visual system according to Example 5 of the present application is shown.

[0121] like Fig.12 As shown, in this embodiment, 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.

[0122] In this embodiment, the first side surface of the reflective polarizing element 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 polarizing element RP.

[0123] 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; a first spacing element P1, located between the first lens E1 and the second lens E2; and a second spacing element P2, located between the second lens E2 and the third lens E3.

[0124] 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.

[0125] Table 5 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 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. Table 6 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 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.

[0126] 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 -18.5496 0.7897 1.645 23.52 refraction S3 Reflective polarizer (RP) Aspheric -21.6377 0.1000 1.502 56.00 refraction S4 Quarter Wave Plate (QWP) Aspheric -21.6377 0.1000 1.502 56.00 refraction S5 Aspheric -21.6377 0.2500 refraction S6 Second lens (E2) Aspheric -30.7029 3.2751 1.546 55.92 refraction S7 Aspheric -15.9703 0.2500 refraction S8 Third lens (E3) Aspheric -16.2887 3.5000 1.645 23.52 refraction S9 Aspheric -21.5780 -3.5000 1.645 23.52 reflection S10 Aspheric -16.2887 -0.2500 refraction S11 Second lens (E2) Aspheric -15.9703 -3.2751 refraction S12 Aspheric -30.7029 -0.2500 refraction S13 Quarter Wave Plate (QWP) Aspheric -21.6377 -0.1000 1.502 56.00 refraction S14 Reflective polarizer (RP) Aspheric -21.6377 0.1000 1.502 56.00 reflection S15 Aspheric -21.6377 0.2500 refraction S16 Second lens (E2) Aspheric -30.7029 3.2751 1.546 55.92 refraction S17 Aspheric -15.9703 0.2500 refraction S18 Third lens (E3) Aspheric -16.2887 3.5000 1.645 23.52 refraction S19 Aspheric -21.5780 0.7538 refraction S20 Image surface (IMG) Spherical endless 0.0000 refraction

[0127] Table 5

[0128]

[0129]

[0130] Table 6

[0131] Referring to Table 9, the relevant parameter values ​​in this embodiment are respectively shown in the 'Example 5' column in Table 9, wherein the specific description of the meaning represented by each parameter is the same as that in the above Example 1, and will not be repeated here.

[0132] Example 6

[0133] The following reference Fig.13 Describe the visual system according to Example 6 of the present application. Fig.13 A structural schematic diagram of a visual system according to Example 6 of the present application is shown.

[0134] like Fig.13 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 elements in the visual system also include: 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, a first spacing element P1 located between the first lens E1 and the second lens E2, and a second spacing element P2 located between the second lens E2 and the third lens E3. 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.

[0135] 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 5, and the high-order coefficient table of the aspheric mirror surface is the same as Table 6.

[0136] The difference between this embodiment and embodiment 5 is that the values ​​of the parameters shown in Table 9 are different. The values ​​of the parameters in this embodiment are shown in the 'Example 6' column in Table 9. 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.

[0137] Fig.14 The axial chromatic aberration curves of the visual systems of Examples 5 and 6 are shown, which represent the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig.15 Astigmatism curves of the visual systems of Examples 5 and 6 are shown, which represent meridional field curvature and sagittal field curvature. Fig.16 The distortion curves of the visual systems of Example 5 and Example 6 are shown, which represent the distortion values ​​corresponding to different field angles. Figures 14 to 16It can be seen that the visual systems provided in Examples 5 and 6 can achieve good imaging quality.

[0138] Example 7

[0139] The following reference Fig.17 Describe the visual system according to Example 7 of the present application. Fig.17 A schematic diagram of the structure of the visual system according to Example 7 of the present application is shown.

[0140] like Fig.17 As shown, in this embodiment, 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.

[0141] In this embodiment, the first side surface of the reflective polarizing element 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 polarizing element RP.

[0142] 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; a first spacing element P1, located between the first lens E1 and the second lens E2; and a second spacing element P2, located between the second lens E2 and the third lens E3.

[0143] 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.

[0144] Table 7 shows the basic parameters of the visual system of Example 7, 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 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. Table 8 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, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 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.

[0145] 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 78.2443 5.6495 1.546 55.92 refraction S3 Reflective polarizer (RP) Aspheric -133.9283 0.1000 1.502 56.00 refraction S4 Quarter Wave Plate (QWP) Aspheric -133.9283 0.1000 1.502 56.00 refraction S5 Aspheric -133.9283 0.2605 refraction S6 Second lens (E2) Aspheric -200.0000 1.4997 1.546 55.92 refraction S7 Aspheric -1055.3909 0.2500 refraction S8 Third lens (E3) Aspheric 897.7500 7.1657 1.546 55.92 refraction S9 Aspheric -47.3077 -7.1657 1.546 55.92 reflection S10 Aspheric 897.7500 -0.2500 refraction S11 Second lens (E2) Aspheric -1055.3909 -1.4997 refraction S12 Aspheric -200.0000 -0.2605 refraction S13 Quarter Wave Plate (QWP) Aspheric -133.9283 -0.1000 1.502 56.00 refraction S14 Reflective polarizer (RP) Aspheric -133.9283 0.1000 1.502 56.00 reflection S15 Aspheric -133.9283 0.2605 refraction S16 Second lens (E2) Aspheric -200.0000 1.4997 1.546 55.92 refraction S17 Aspheric -1055.3909 0.2500 refraction S18 Third lens (E3) Aspheric 897.7500 7.1657 1.546 55.92 refraction S19 Aspheric -47.3077 0.8652 refraction S20 Image surface (IMG) Spherical endless 0.0000 refraction

[0146] Table 7

[0147] Coefficient\Surface S2 S3 S6 S7 S8 S9 A4 -2.3507E-01 1.6857E-01 -4.4543E-01 -2.3022E-01 -6.4525E-01 6.3214E-03 A6 -7.2111E-02 1.5702E-02 2.4933E-02 1.5647E-01 1.5977E-01 -1.1485E-02 A8 -4.9613E-02 1.5198E-03 -1.3528E-03 -2.4706E-01 -1.1449E-01 -1.2245E-03 A10 -5.2795E-04 -6.4110E-04 2.6530E-03 3.1457E-02 1.5670E-02 0.0000E+00 A12 -7.3031E-03 -2.8373E-03 -7.6516E-03 -3.8328E-04 6.5357E-03 0.0000E+00 A14 1.7584E-04 1.3518E-04 1.9565E-03 -9.1639E-03 -4.8091E-03 0.0000E+00 A16 -4.7630E-04 1.1613E-04 1.7073E-03 2.8351E-03 1.2567E-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

[0148] Table 8

[0149] Referring to Table 9, the relevant parameter values ​​in this embodiment are respectively shown in the 'Embodiment 7' column in Table 9, 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.

[0150] Example 8

[0151] The following reference Fig.18 Describe the visual system according to Example 8 of the present application. Fig.18 A schematic diagram of the structure of the visual system according to Example 8 of the present application is shown.

[0152] like Fig.18 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 elements in the visual system also include: 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, a first spacing element P1 located between the first lens E1 and the second lens E2, and a second spacing element P2 located between the second lens E2 and the third lens E3. 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.

[0153] The structure of the visual system of this embodiment is the same as that of the visual system of Example 7, that is, the basic parameter table of the visual system of this embodiment is the same as Table 7, and the high-order coefficient table of the aspheric mirror surface is the same as Table 8.

[0154] The difference between this embodiment and embodiment 7 is that the values ​​of the parameters shown in Table 9 are different. The values ​​of the parameters in this embodiment are shown in the 'Example 8' column in Table 9. 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.

[0155] Fig.19 The axial chromatic aberration curves of the visual systems of Examples 7 and 8 are shown, which indicate the deviation of light rays of different wavelengths from the convergent focus behind the lens. Fig. 20 Astigmatism curves of the visual systems of Example 7 and Example 8 are shown, which represent the meridional field curvature and the sagittal field curvature. Fig.21 The distortion curves of the visual systems of Example 7 and Example 8 are shown, which represent the distortion values ​​corresponding to different field angles. Figures 19 to 21 It can be seen that the visual systems provided in Examples 7 and 8 can achieve good imaging quality.

[0156] Parameters / Examples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 d0bs 35.6939 35.9609 37.5530 37.3078 23.4447 23.2083 36.5502 36.5237 d0bm 35.6939 35.9609 37.5530 37.3078 23.4447 23.2083 36.5502 36.5237 D0bs 39.7815 39.7815 42.9814 42.9814 28.4257 28.4257 42.7255 42.7255 D0bm 39.7815 39.7815 42.9814 42.9814 28.4257 28.4257 42.7255 42.7255 d1s 39.4065 40.0438 39.7466 39.9790 25.3295 25.1793 39.2692 39.4269 d1m 39.4065 40.0438 41.0506 40.8405 25.3295 25.1793 39.2692 39.4269 D1s 48.0369 48.0369 43.1709 43.2469 29.2124 29.2124 44.1267 44.1267 D1m 48.0369 48.0369 44.3585 44.0147 29.2124 29.2124 44.1267 44.1267 d2s 43.7758 43.4664 44.1628 44.2094 29.5426 29.6971 42.1911 42.4732 d2m 43.7758 43.4664 44.5656 44.6111 29.5426 29.6971 42.1911 42.4732 D2s 49.7621 49.5621 47.0923 47.0888 36.2207 36.2207 46.1770 46.1770 D2m 49.7621 49.5621 47.6141 47.4588 36.2207 36.2207 46.1770 46.1770 d0s 33.8107 34.5198 35.5344 35.5344 22.7425 23.3083 35.3299 35.8201 d0m 51.2585 51.0777 50.2423 50.4403 37.6893 37.3394 48.3153 48.5284 D0s 42.2547 41.4151 44.9250 44.9250 30.9742 30.7832 44.2300 45.0553 D0m 53.4529 53.4619 52.6032 52.6205 39.2328 39.1394 50.1600 50.5559 CP1 0.1000 0.1000 1.2180 1.2180 0.1000 0.1000 0.1000 0.1000 EP12 3.8589 3.9589 1.8305 1.8305 1.0499 1.0499 2.5016 2.5016 CP2 0.1000 0.1000 0.8378 0.8378 0.1000 0.1000 0.1000 0.1000 L 9.4812 9.4812 9.3946 9.4946 7.4568 7.4568 10.7515 10.8515

[0157] Table 9

[0158] In addition, in Examples 1 to 8, 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 sum of the center thicknesses ∑CT of the first lens, the second lens and the third lens on the optical axis, and the maximum field of view FOV of the visual system are respectively shown in Table 10 below.

[0159] Parameters / Examples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 f23(mm) 109.20 109.20 77.77 77.77 109.38 109.38 99.38 99.38 f1(mm) 113.80 113.80 121.98 121.98 -224.02 -224.02 91.32 91.32 f2(mm) -82.65 -82.65 3289.20 3289.20 56.52 56.52 -452.24 -452.24 f3(mm) 48.66 48.66 79.22 79.22 -139.15 -139.15 82.53 82.53 EPD(mm) 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 f(mm) 15.66 15.66 15.99 15.99 14.39 14.39 15.89 15.89 TD(mm) 13.15 13.15 13.57 13.57 8.26 8.26 15.03 15.03 ∑CT(mm) 12.41 12.41 12.63 12.63 7.56 7.56 14.31 14.31 FOV(°) 96.0 96.0 96.0 96.0 96.0 96.0 96.0 96.0

[0160] Table 10 and Examples 1 to 8 respectively satisfy the conditions shown in the following Table 11.

[0161] Conditional / Example Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 f / EPD 3.13 3.13 3.20 3.20 2.88 2.88 3.18 3.18 f×tan(FOV / 2)(mm) 17.39 17.39 17.76 17.76 15.98 15.98 17.65 17.65 TD / (CP1+EP12+CP2) 3.24 3.16 3.49 3.49 6.61 6.61 5.56 5.56 d0bs / f 2.28 2.30 2.35 2.33 1.63 1.61 2.30 2.30 CT1 / d0bm 0.07 0.07 0.10 0.10 0.03 0.03 0.15 0.15 d2s / d1m 1.11 1.09 1.08 1.08 1.17 1.18 1.07 1.08 (V2 / V1)×(D1s / d1s) 0.51 0.50 1.09 1.08 2.74 2.76 1.12 1.12 (N2 / N3)×(D2m / d2m) 1.21 1.21 1.07 1.06 1.15 1.15 1.09 1.09 d0s / f1 0.30 0.30 0.29 0.29 -0.10 -0.10 0.39 0.39 CT3 / d0m 0.18 0.18 0.14 0.14 0.09 0.09 0.15 0.15 f23 / D2s 2.19 2.20 1.65 1.65 3.02 3.02 2.15 2.15 (D0bs+D0bm) / |R1| 1.28 1.28 1.29 1.29 3.06 3.06 1.09 1.09 D0m / D0s 1.27 1.29 1.17 1.17 1.27 1.27 1.13 1.12 ∑CT / L 1.31 1.31 1.34 1.33 1.01 1.01 1.33 1.32

[0162] Table 11

[0163] 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.

[0164] 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 within 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 or negative optical power. The second lens has a positive or negative optical power. The third lens has a positive or negative 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; a first spacer element located between the first lens and the second lens; a second spacer element located between the second lens and the third lens. The visual system satisfies: 2.8 < f / EPD < 3.3; 15.8 mm < f × tan(FOV / 2) < 17.8 mm; and 3.1 < TD / (CP1 + EP12 + CP2) < 6.7, where f is the effective focal length of the visual system, EPD is the entrance pupil diameter of the visual system, FOV is the maximum field of view angle of the visual system, TD is the distance on the optical axis from the first side face of the first lens to the second side face of the third lens, CP1 is the maximum thickness of the first spacer element, EP12 is the distance on the optical axis from the second side face of the first spacer element to the first side face of the second spacer element, and CP2 is the maximum thickness of the second spacer element.

2. The visual system according to claim 1, characterized in that: The inner diameter d0bs of the first side face of the lens barrel auxiliary element satisfies: 1.6 < d0bs / f < 2.

4.

3. The visual system according to claim 1, characterized in that: The central thickness CT1 of the first lens on the optical axis and the inner diameter d0bm of the second side face of the lens barrel auxiliary element satisfy: 0 < CT1 / d0bm < 0.

2.

4. The visual system according to claim 1, characterized in that: The inner diameter d2s of the first side face of the second spacer element and the inner diameter d1m of the second side face of the first spacer element satisfy: 1.0 < d2s / d1m < 1.

2.

5. The visual system according to claim 1, characterized in that: The Abbe number V2 of the second lens, the Abbe number V1 of the first lens, the outer diameter D1s of the first side face of the first spacer element, and the inner diameter d1s of the first side face of the first spacer element satisfy: 0.4 < (V2 / V1) × (D1s / d1s) < 2.

8.

6. The visual system according to claim 1, characterized in that: The refractive index N2 of the second lens, the refractive index N3 of the third lens, the outer diameter D2m of the second side face of the second spacer element, and the inner diameter d2m of the second side face of the second spacer element satisfy: 1.0 < (N2 / N3) × (D2m / d2m) < 1.

3.

7. The visual system according to any one of claims 1 to 6, characterized in that: The inner diameter d0s of the first side end face of the lens barrel and the effective focal length f1 of the first lens satisfy: -0.2 < d0s / f1 < 0.

4.

8. The visual system according to any one of claims 1 to 6, characterized in that: The central thickness CT3 of the third lens on the optical axis and the inner diameter d0m of the second side end face of the lens barrel satisfy: 0.05 < CT3 / d0m < 0.

2.

9. The visual system according to any one of claims 1 to 6, characterized in that: The combined focal length f23 of the second lens and the third lens and the outer diameter D2s of the first side face of the second spacer element satisfy: 1.6 < f23 / D2s < 3.

1.

10. The visual system according to any one of claims 1 to 6, characterized in that: The outer diameter D0bs of the first side surface of the lens barrel auxiliary element, the outer diameter D0bm of the second side surface of the lens barrel auxiliary element, and the curvature radius R1 of the first side surface of the first lens satisfy: 1.0 < (D0bs + D0bm) / |R1| < 3.

1.

11. The visual system according to any one of claims 1 to 6, characterized in that: The outer diameter D0m of the second side end surface of the lens barrel and the outer diameter D0s of the first side end surface of the lens barrel satisfy: 1.1 < D0m / D0s < 1.

3.

12. The visual system according to any one of claims 1 to 6, characterized in that: The sum ∑CT of the central thicknesses of the first lens, the second lens, and the third lens on the optical axis and the maximum height L of the lens barrel in the optical axis direction satisfy: 1.0 < ∑CT / L < 1.

4.

13. A visual system, characterized in that: Comprising 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, wherein, The first lens has a positive or negative optical power; The second lens has a positive or negative optical power; The third lens has a positive or negative optical power; The spacer element group includes: a lens barrel auxiliary element located between the inner end surface of the first side of the lens barrel and the first lens; a first spacer element located between the first lens and the second lens; a second spacer element located between the second lens and the third lens; The visual system satisfies: 2.8 < f / EPD < 3.3; 15.8 mm < f×tan(FOV / 2) < 17.8 mm; and 1.0 < d2s / d1m < 1.2, wherein, f is the effective focal length of the visual system, EPD is the entrance pupil diameter of the visual system, FOV is the maximum field of view angle of the visual system, d2s is the inner diameter of the first side surface of the second spacer element, and d1m is the inner diameter of the second side surface of the first spacer element.

14. The visual system according to claim 13, characterized in that: The inner diameter d0bs of the first side surface of the lens barrel auxiliary element satisfies: 1.6 < d0bs / f < 2.

4.

15. The visual system according to claim 14, characterized in that: The distance TD on the optical axis from the first side surface of the first lens to the second side surface of the third lens, the maximum thickness CP1 of the first spacer element, the distance EP12 on 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 CP2 of the second spacer element satisfy: 3.1 < TD / (CP1 + EP12 + CP2) < 6.

7.

16. The visual system according to claim 13, characterized in that: The central thickness CT1 of the first lens on the optical axis and the inner diameter d0bm of the second side surface of the lens barrel auxiliary element satisfy: 0 < CT1 / d0bm < 0.

2.

17. The visual system according to claim 13, characterized in that: The Abbe number V2 of the second lens, the Abbe number V1 of the first lens, 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 satisfy: 0.4 < (V2 / V1)×(D1s / d1s) < 2.

8.

18. The visual system according to claim 13, characterized in that: The refractive index N2 of the second lens, the refractive index N3 of the third lens, the outer diameter D2m of the second side surface of the second spacer element, and the inner diameter d2m of the second side surface of the second spacer element satisfy: 1.0<(N2 / N3)×(D2m / d2m)<1.

3.

19. The visual system according to any one of claims 13 to 18, characterized in that: The inner diameter d0s of the first side end surface of the lens barrel and the effective focal length f1 of the first lens satisfy: -0.2 <d0s / f1<0.4。 20. The visual system according to any one of claims 13 to 18, characterized in that: The central thickness CT3 of the third lens on the optical axis and the inner diameter d0m of the second side end surface of the lens barrel satisfy: 0.05 <CT3 / d0m<0.2。 21. The visual system according to any one of claims 13 to 18, characterized in that: The combined focal length f23 of the second lens and the third lens and the outer diameter D2s of the first side surface of the second spacing element satisfy: 1.6 <f23 / D2s<3.1。 22. The visual system according to any one of claims 13 to 18, characterized in that: The outer diameter D0bs of the first side surface of the lens barrel auxiliary element, the outer diameter D0bm of the second side surface of the lens barrel auxiliary element and the curvature radius R1 of the first side surface of the first lens satisfy: 1.0<(D0bs+D0bm) / |R1|<3.

1.

23. The visual system according to any one of claims 13 to 18, characterized in that: The outer diameter D0m of the second side end surface of the lens barrel and the outer diameter D0s of the first side end surface of the lens barrel satisfy: 1.1 <D0m / D0s<1.3。 24. The visual system according to any one of claims 13 to 18, characterized in that: The sum of the center thicknesses ΣCT of the first lens, the second lens, and the third lens on the optical axis and the maximum height L of the lens barrel along the optical axis satisfy: 1.0<∑CT / L<1.

4.

25. A VR device, comprising the visual system according to any one of claims 1 to 24, wherein: The first side is a human eye side, and the second side is a display side.

Images