CN220252290U

CN220252290U - Visual system and VR equipment comprising same

Info

Publication number: CN220252290U
Application number: CN202321071901.0U
Authority: CN
Inventors: 赵世一; 梁宁; 游金兴; 张晓彬; 金银芳; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2023-05-05
Filing date: 2023-05-05
Publication date: 2023-12-26
Anticipated expiration: 2033-05-05

Abstract

The application discloses a visual system and VR equipment comprising the visual system, wherein the visual system comprises a lens barrel, a first element group and a second element group 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 element group has positive focal power and comprises a reflective polarizing element, a first lens, a quarter wave plate and a second lens; the second element group has positive optical power or negative optical power and comprises a third lens; the first lens and the second lens are provided with a first spacing element therebetween, and the second lens and the third lens are provided with a second spacing element therebetween. The effective focal length FG1 of the first element group, the center thickness CT1 of the first lens on the optical axis, the maximum thickness CP1 of the first spacing element in the direction parallel to the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 1.5< FG1/(CT1+CP1+CT2) <3.

Description

Visual system and VR equipment comprising same

Technical Field

The present application relates to the field of optical elements, and more particularly, to a vision system and VR device including the same.

Background

In recent years, with the proposal of the concept of "meta universe", entertainment ways of people are increasingly abundant, and devices such as AR (augmented reality)/VR (virtual reality) and the like of man-machine interaction are increasingly favored by people. However, VR lenses generally have problems such as large volume and high processing difficulty.

In order to solve the above-mentioned problem, a foldback scheme is proposed, and a person skilled in the art hopes that by improving the design of the VR lens structure, the optical path folding can be realized to a greater extent, so that the thickness of the VR device is further compressed, the lens structure is more compact and light, meanwhile, the workability of the lens barrel and each lens can be reasonably ensured, the assembly yield is improved, and further development and application of the VR technology are promoted.

Disclosure of Invention

The application provides a visual system which can comprise a lens barrel, a first element group and a second element group, wherein the first element group and the second element group 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 element group has positive focal power and comprises a reflective polarizing element, a first lens, a quarter wave plate and a second lens; the second element group has positive optical power or negative optical power and comprises a third lens; a first spacing element is between the first lens and the second lens, and a second spacing element is between the second lens and the third lens. The effective focal length FG1 of the first element group, the center thickness CT1 of the first lens on the optical axis, the maximum thickness CP1 of the first spacer element in the direction parallel to the optical axis, and the center thickness CT2 of the second lens on the optical axis may satisfy: 1.5< FG1/(CT1+CP1+CT2) <3.

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

In one embodiment, a distance EP12 along the optical axis from the second side of the first spacing element to the first side of the second spacing element, a distance T12 on the optical axis from the second side of the first lens to the first side of the second lens, and a center thickness CTQ of the quarter-wave plate on the optical axis may satisfy: 3.2< ep 12/(t12+ctq) <5.6.

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

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

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

In one embodiment, the visual system further comprises a lens barrel auxiliary element positioned between an inner end surface of the lens barrel adjacent to the first side and the first lens and abutting against a first side surface of the first lens; the radius of curvature R1 of the first side surface of the first lens, the radius of curvature R2 of the second side surface of the first lens, the inner diameter d0bs of the first side surface of the barrel auxiliary member, and the inner diameter d0bm of the second side surface of the barrel auxiliary member may satisfy: 2< (R1×R2)/(d0bs×d0bm) <4.

In one embodiment, the effective focal length f of the visual system, the outer diameter D0m of the second side end surface of the lens barrel, and the outer diameter D0s of the first side end surface of the lens barrel may satisfy: 2.2< f/(D0 m-D0 s) <4.2.

In one embodiment, the visual system further comprises a lens barrel auxiliary element positioned between an inner end surface of the lens barrel adjacent to the first side and the first lens and abutting against a first side surface of the first lens; a distance TD on the optical axis from the first side surface of the first lens to the second side surface of the third lens, a maximum thickness CP0b of the barrel auxiliary element in a direction parallel to the optical axis, a maximum thickness CP1 of the first spacer element in a direction parallel to the optical axis, and a maximum thickness CP2 of the second spacer element in a direction parallel to the optical axis may satisfy: 7.5< TD/(CP0b+CP1+CP2) <52.5.

In one embodiment, the outer diameter D1s of the first side of the first spacing element, the outer diameter D1m of the second side of the first spacing element and the effective focal length FG1 of the first element group may satisfy: 4< (D1s+D1m)/FG1 <5.

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

In one embodiment, the visual system further comprises a lens barrel auxiliary element positioned between an inner end surface of the lens barrel adjacent to the first side and the first lens and abutting against a first side surface of the first lens; an outer diameter D0bs of the first side surface of the barrel auxiliary member, an outer diameter D0bm of the second side surface of the barrel auxiliary member, and a radius of curvature R6 of the second side surface of the third lens may satisfy: -2.5< (d0bs+d0bm)/R6 < -2.

In another aspect, the present application further provides a VR device, where the VR device includes a visual system provided in at least one of the foregoing embodiments, and the first side is a human eye side and the second side is a display side.

The visual system comprises a first element group and a second element group which are assembled in a lens barrel and are sequentially arranged from a first side to a second side along an optical axis, wherein the first element group has positive focal power and comprises a reflective polarizing element, a first lens, a quarter wave plate and a second lens; the second element group has positive optical power or negative optical power and comprises a third lens; a first spacing element is arranged between the first lens and the second lens, and a second spacing element is arranged between the second lens and the third lens; meanwhile, the effective focal length FG1 of the first element group, the center thickness CT1 of the first lens on the optical axis, the maximum thickness CP1 of the first spacing element in the direction parallel to the optical axis, and the center thickness CT2 of the second lens on the optical axis are controlled to satisfy the condition 1.5< fg1/(CT 1+cp1+ct 2) <3. The arrangement of the visual system disclosed in the application can control the assembly deformation amount and strength of the first lens, the first spacing element and the second lens in the first element group, reduce the tolerance sensitivity of the two lenses and improve the processability and assembly yield of the two lenses.

Drawings

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

FIG. 1 illustrates a schematic view of the structure and some parameters of a visual system according to an exemplary embodiment of the present application;

FIGS. 2, 3 and 4 show schematic structural views of a visual system according to example 1 of the present application in three embodiments, respectively;

FIGS. 5, 6 and 7 show on-axis chromatic aberration curves, astigmatism curves and distortion curves, respectively, for the visual system of example 1;

FIGS. 8, 9 and 10 show schematic structural views of a visual system according to example 2 of the present application in three embodiments, respectively;

FIGS. 11, 12 and 13 show on-axis chromatic aberration curves, astigmatism curves and distortion curves, respectively, for the visual system of example 2;

FIGS. 14, 15 and 16 show schematic structural views of a visual system according to example 3 of the present application in three embodiments, respectively; and

fig. 17, 18 and 19 show on-axis chromatic aberration curves, astigmatism curves and distortion curves, respectively, of the visual system of example 3.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in the present 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 feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then 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.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

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

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The following examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

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

The vision system according to the exemplary embodiment of the present application may include a lens barrel and a lens group assembled in the lens barrel, and the lens group may include a first element group and a second element group sequentially arranged from a first side to a second side along an optical axis.

In an exemplary embodiment, the first element group may have positive optical power. The first element group may include a reflective polarizing element, a first lens, a quarter wave plate, and a second lens.

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

In an exemplary embodiment, the visual system may further include a first spacing element between the first lens and the second lens, and a second spacing element between the second lens and the third lens.

In an exemplary embodiment, the visual system of the present application may satisfy the conditional expression 1.5< fg1/(CT 1+cp1+ct 2) <3, where FG1 is the effective focal length of the first element group, CT1 is the center thickness of the first lens on the optical axis, CP1 is the maximum thickness of the first spacer element in the direction parallel to the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

The visual system provided according to the exemplary embodiment of the present application includes a first element group and a second element group which are assembled in a lens barrel and sequentially arranged from a first side to a second side along an optical axis, wherein the first element group has positive optical power and includes a reflective polarizing element, a first lens, a quarter-wave plate, and a second lens; the second element group has positive optical power or negative optical power and comprises a third lens; a first spacing element is arranged between the first lens and the second lens, and a second spacing element is arranged between the second lens and the third lens; meanwhile, the effective focal length FG1 of the first element group, the center thickness CT1 of the first lens on the optical axis, the maximum thickness CP1 of the first spacing element in the direction parallel to the optical axis, and the center thickness CT2 of the second lens on the optical axis are controlled to satisfy the condition 1.5< fg1/(CT 1+cp1+ct 2) <3. By this arrangement of the vision system, the amount and strength of the assembly deformation of the first lens, the first spacer element and the second lens in the first element group can be controlled, the tolerance sensitivity of the two lenses can be reduced, and the workability and assembly yield can be improved.

It will be appreciated that the surface of each element in the visual system of the present application that is closer to the first side and farther from the second side is the first side of the element and the surface of each element that is closer to the second side and farther from the first side is the second side of the element.

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

In an exemplary embodiment, the vision system of the present application may satisfy the condition 1< |r3|/(d1s+d1m) <2.5, where R3 is a radius of curvature of the first side of the second lens, d1s is an inner diameter of the first side of the first spacer element, and d1m is an inner diameter of the second side of the first spacer element. By controlling the radius of curvature of the first side of the second lens, the inner diameter of the first side of the first spacer element and the inner diameter of the second side of the first spacer element to satisfy the condition 1< |r3|/(d1s+d1m) <2.5, it is advantageous to ensure the workability of the second lens, avoid the generation of excessive parasitic light from the first side surface of the second lens, and improve the imaging effect.

In an exemplary embodiment, the vision system of the present application may satisfy the conditional expression 3.2< EP 12/(t12+ctq) <5.6, where EP12 is a distance from the second side of the first spacer element to the first side of the second spacer element along the optical axis, T12 is a distance from the second side of the first lens to the first side of the second lens on the optical axis, and CTQ is a center thickness of the quarter wave plate on the optical axis. By controlling the distance from the second side surface of the first spacing element to the first side surface of the second spacing element along the optical axis, the distance from the second side surface of the first lens to the first side surface of the second lens on the optical axis, and the center thickness of the quarter wave plate on the optical axis to satisfy the condition 3.2< ep 12/(t12+ctq) <5.6, the problems of reduced transmissivity, increased haze, and the like caused by the too thick quarter wave plate can be avoided, thereby ensuring the imaging quality of the whole optical system.

In an exemplary embodiment, the vision system of the present application may satisfy the condition-4 < (d2s+d2s)/R4 < "2, where D2s is the inner diameter of the first side of the second spacer element, D2s is the outer diameter of the first side of the second spacer element, and R4 is the radius of curvature of the second side of the second lens. By controlling the inner diameter of the first side of the second spacer element, the outer diameter of the first side of the second spacer element and the radius of curvature of the second side of the second lens to satisfy the condition-4 < (d2s+d2s)/R4 < -2, the overall dimension of the second spacer element can be controlled, the supporting range of the second lens can be ensured, the assembly yield of the lens can be ensured, the too thin processing difficulty of the thickness of the second spacer element can be avoided, and the processability of the second lens can be ensured.

In an exemplary embodiment, the vision system of the present application may satisfy the conditional expression 10.5< d0s/EPD <12.5, where d0s is the inner diameter of the first side end surface of the lens barrel and EPD is the entrance pupil diameter of the vision system. By controlling the ratio of the inner diameter of the first side end surface of the lens barrel to the entrance pupil diameter of the visual system in this range, the amount of light entering can be effectively controlled, and the light can be used more efficiently to participate in imaging.

In an exemplary embodiment, the vision system of the present application may satisfy the conditional expression-3.5 < (d2m+d2m)/R5 < -1.5, where D2m is an inner diameter of the second side of the second spacing element, D2m is an outer diameter of the second side of the second spacing element, and R5 is a radius of curvature of the first side of the third lens. By controlling the inner diameter of the second side surface of the second spacing element, the outer diameter of the second side surface of the second spacing element and the curvature radius of the first side surface of the third lens to meet the condition-3.5 < (d2m+d2m)/R5 < -1.5, the overall dimension of the second spacing element can be controlled, the supporting range of the third lens can be ensured, the assembly yield of the lens can be ensured, the too thin processing difficulty can be avoided, and the processability of the third lens can be ensured.

In an exemplary embodiment, the visual system of the present application may further include a barrel auxiliary member located between an inner end surface of the barrel adjacent to the first side (i.e., an end surface of the barrel interior closest to the first side) and the first lens and abutting the first side surface of the first lens.

In an exemplary embodiment, the vision system of the present application may satisfy the conditional expression 2< (r1×r2)/(d 0bs×d0 bm) <4, where R1 is a radius of curvature of the first side surface of the first lens, R2 is a radius of curvature of the second side surface of the first lens, d0bs is an inner diameter of the first side surface of the barrel auxiliary member, and d0bm is an inner diameter of the second side surface of the barrel auxiliary member. The curvature radius of the first side surface of the first lens, the curvature radius of the second side surface of the first lens, the inner diameter of the first side surface of the lens barrel auxiliary element and the inner diameter of the second side surface of the lens barrel auxiliary element are controlled to meet the condition of 2< (R1×R2)/(d0bs×d0bm) <4, and the curvature radius of the far-light surface (the first side surface) and the near-light surface (the second side surface) of the first lens is reasonably controlled, so that on one hand, off-axis aberration can be corrected, on the other hand, stray light reflected to the first lens by the lens barrel mechanism can be avoided, and the overall image quality of the system is improved.

In an exemplary embodiment, the vision system of the present application may satisfy the condition 2.2< f/(D0 m-D0 s) <4.2, where f is an effective focal length of the vision system, D0m is an outer diameter of a second side end surface of the lens barrel (i.e., an end surface or surface closest to the second side of the lens barrel), and D0s is an outer diameter of a first side end surface of the lens barrel (i.e., an end surface or surface closest to the first side of the lens barrel). By controlling the effective focal length of the visual system, the outer diameter of the second side end surface of the lens barrel and the outer diameter of the first side end surface of the lens barrel to meet the condition of 2.2< f/(D0 m-D0 s) <4.2, the outline dimension of the lens barrel can be reasonably controlled, the first side surface of the lens barrel is ensured to be smoothly transited to the second side surface, the processing difficulty of the lens barrel is avoided to be overlarge, and meanwhile, the lens assembly yield is improved.

In an exemplary embodiment, the vision system of the present application may satisfy the conditional expression 7.5< TD/(CP 0b+cp1+cp 2) <52.5, where TD is the distance on the optical axis between the first side of the first lens and the second side of the third lens, CP0b is the maximum thickness of the barrel auxiliary member in the direction parallel to the optical axis, CP1 is the maximum thickness of the first spacer member in the direction parallel to the optical axis, and CP2 is the maximum thickness of the second spacer member in the direction parallel to the optical axis. By controlling the distance from the first side surface of the first lens to the second side surface of the third lens on the optical axis, the maximum thickness of the lens barrel auxiliary element along the direction parallel to the optical axis, the maximum thickness of the first spacing element along the direction parallel to the optical axis and the maximum thickness of the second spacing element along the direction parallel to the optical axis to satisfy the condition 7.5< TD/(CP0b+CP1+CP2) <52.5, the thicknesses of the elements are reasonably distributed, the thickness of the whole lens can be compressed as much as possible, the user experience of the whole lens can be ensured, and the rationality of the thicknesses of the lens barrel auxiliary element, the first spacing element and the second spacing element can be maintained, so that the processability of the lens barrel auxiliary element is ensured.

In an exemplary embodiment, the visual system of the present application may satisfy the condition 4< (d1s+d1m)/FG 1<5, where D1s is the outer diameter of the first side of the first spacing element, D1m is the outer diameter of the second side of the first spacing element, FG1 is the effective focal length of the first element group. The outer diameter of the first side surface of the first spacing element, the outer diameter of the second side surface of the first spacing element and the effective focal length of the first element group are controlled to meet the condition 4< (D1s+D1m)/FG1 <5, so that the trend of light rays in the first lens and the second lens is controlled, the sensitivity of the first lens and the second lens is reduced, the excessive smooth and smooth of the first side surface and the second side surface of the first spacing element is further ensured, the machinability of the first spacing element is ensured, and the assembly yield is improved.

In an exemplary embodiment, the visual system of the present application may satisfy the condition 2< EP 01/(ctr+ct1) <3.5, where EP01 is a distance from the first side end surface of the lens barrel to the first side surface of the first spacer element along the optical axis, CTR is a center thickness of the reflective polarizing element on the optical axis, and CT1 is a center thickness of the first lens on the optical axis. The distance from the first side surface of the lens barrel to the first side surface of the first interval element along the optical axis, the central thickness of the reflective polarizing element on the optical axis and the central thickness of the first lens on the optical axis are controlled to meet the condition formula 2< EP01/(CTR+CT1) <3.5, which is favorable for ensuring field curvature of the system, improving the assembly yield of the lens and further ensuring the processability of the first lens.

In an exemplary embodiment, the vision system of the present application may satisfy the conditional expression-2.5 < (d0bs+d0bm)/R6 < -2, where D0bs is an outer diameter of the first side of the barrel auxiliary member, D0bm is an outer diameter of the second side of the barrel auxiliary member, and R6 is a radius of curvature of the second side of the third lens. By controlling the outer diameter of the first side of the lens barrel auxiliary element, the outer diameter of the second side of the lens barrel auxiliary element and the radius of curvature of the second side of the third lens to meet the condition-2.5 < (D0bs+D0bm)/R6 < -2, on one hand, light divergence is facilitated, and on the other hand, processing and assembly of the lens barrel auxiliary element are facilitated.

In an exemplary embodiment, the vision system of the present application may include at least one aperture. The diaphragm can restrict the light path and control the intensity of light. The aperture may be provided in a suitable position of the visual system as desired, for example, the aperture may be provided between the first side (the human eye side) and the first lens.

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

According to the visual system of the above embodiment of the present application, by providing a first element group and a second element group which are assembled in a lens barrel and sequentially arranged from a first side to a second side along an optical axis, wherein the first element group has positive optical power and includes a reflective polarizing element, a first lens, a quarter-wave plate, and a second lens; the second element group has positive optical power or negative optical power and comprises a third lens; a first spacing element is arranged between the first lens and the second lens, and a second spacing element is arranged between the second lens and the third lens; meanwhile, the effective focal length FG1 of the first element group, the center thickness CT1 of the first lens on the optical axis, the maximum thickness CP1 of the first spacing element in the direction parallel to the optical axis, and the center thickness CT2 of the second lens on the optical axis are controlled to satisfy the condition 1.5< fg1/(CT 1+cp1+ct 2) <3. The assembly deformation amount and strength of the first lens, the first spacing element and the second lens in the first element group can be controlled, the tolerance sensitivity of the two lenses is reduced, and the processability and assembly yield of the two lenses are improved.

According to the visual system of the embodiment of the application, by designing a three-piece foldback scheme, adopting reasonable film layer arrangement and the like, the light path folding of a greater degree can be realized, so that the thickness of VR equipment is further compressed; meanwhile, the imaging quality can be improved, and the improvement of user experience is facilitated.

Specific examples of visual systems applicable to the above embodiments are further described below with reference to the accompanying drawings.

Example 1

The following describes a visual system according to embodiment 1 of the present application with reference to fig. 2, 3, 4, and 5, 6, and 7. Fig. 2, 3 and 4 show schematic structural views of the visual system according to example 1 of the present application in three different embodiments (embodiment 1-1, embodiment 1-2, embodiment 1-3), respectively.

As shown in fig. 2, 3 and 4, the visual system includes a lens barrel P0 and a lens assembly mounted in the lens barrel P0, arranged in order from a first side (human eye side) to a second side (display side) along an optical axis: a reflective polarizing element RP, a first lens E1, a quarter wave plate QWP, a second lens E2, and a third lens E3; the vision system also includes an image plane IMG on the second side.

In this embodiment, the reflective polarizing element RP, the first lens E1, the quarter-wave plate QWP and the second lens E2 may constitute a first element group, and in particular, the second side of the reflective polarizing element RP (the surface near the display side, the surface far the human eye side) may be attached to the first side of the first lens E1 (the surface near the human eye side, the surface far the display side), and the second side of the quarter-wave plate QWP (the surface near the display side, the surface far the human eye side) may be attached to the first side of the second lens E2 (the surface near the human eye side, the surface far the display side). The first element group has positive optical power.

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

In this embodiment, the visualization system further comprises: a lens barrel auxiliary member P0b located between an inner end surface of the lens barrel P0 near the first side (i.e., an end surface of the lens barrel interior nearest to the first side) and the first lens E1, and the lens barrel auxiliary member P0b abuts against the first side surface of the first lens E1; a first spacing element P1 located between the first lens E1 and the second lens E2; and a second spacing element P2 located between the second lens E2 and the third lens E3.

Table 1 shows the basic parameters of the visual system of example 1, wherein the radius of curvature and the thickness/distance are both in millimeters (mm).

Surface of the body	Surface type	Radius of curvature	Thickness/distance	Refractive index	Abbe number	Refraction/reflection	Coefficient of taper
								S0	Spherical surface	Infinity is provided	Infinity is provided			Refraction by refraction
S1	Spherical surface	Infinity is provided	18.5927			Refraction by refraction
								S2	Aspherical surface	-71.7746	0.2000	1.50	57.00	Refraction by refraction
S3	Aspherical surface	-71.7746	1.9700	1.60	26.13	Refraction by refraction	0.0000
								S4	Aspherical surface	-95.9737	0.1000			Refraction by refraction	0.0000
S5	Aspherical surface	-140.7247	0.3000	1.50	57.00	Refraction by refraction
								S6	Aspherical surface	-140.7247	11.2197	1.56	46.39	Refraction by refraction	0.0000
S7	Aspherical surface	-40.0554	0.1000			Refraction by refraction	0.0000
								S8	Aspherical surface	-42.1444	2.0000	1.64	21.46	Refraction by refraction	0.0000
S9	Aspherical surface	-56.3156	-2.0000	1.64	21.46	Reflection of	0.0000
								S10	Aspherical surface	-42.1444	-0.1000			Refraction by refraction
S11	Aspherical surface	-40.0554	-11.2197	1.56	46.39	Refraction by refraction
								S12	Aspherical surface	-140.7247	-0.3000	1.50	57.00	Refraction by refraction
S13	Aspherical surface	-140.7247	-0.1000			Refraction by refraction
								S14	Aspherical surface	-95.9737	-1.9700	1.60	26.13	Refraction by refraction
S15	Aspherical surface	-71.7746	1.9700	1.60	26.13	Reflection of
								S16	Aspherical surface	-95.9737	0.1000			Refraction by refraction
S17	Aspherical surface	-140.7247	0.3000	1.50	57.00	Refraction by refraction
								S18	Aspherical surface	-140.7247	11.2197	1.56	46.39	Refraction by refraction
S19	Aspherical surface	-40.0554	0.1000			Refraction by refraction
								S20	Aspherical surface	-42.1444	2.0000	1.64	21.46	Refraction by refraction
S21	Aspherical surface	-56.3156	5.3777			Refraction by refraction
								S22	Spherical surface	Infinity is provided	0.0000			Refraction by refraction

TABLE 1

In embodiment 1, the surfaces S2 to S21 are all aspheric, and each aspheric surface pattern x can be defined by, but not limited to, the following aspheric formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The higher order coefficients A that can be used for the respective aspheres S3, S4, S6 to S9 in example 1 are given in Table 2 below ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ And A ₂₀ 。

Coefficient/surface

S3

S4

S6

S7

S8

S9

A4

-3.9844E-02

-1.5037E-01

2.5695E-01

5.9157E-02

-1.4120E-01

-2.9627E-02

A6

1.1446E-01

-2.1338E-01

1.3168E-02

2.5578E-01

-2.0257E-01

-1.6513E-03

A8

-2.8323E-02

1.3476E-01

7.5666E-02

-9.2370E-02

1.2953E-01

-1.2735E-02

A10

-4.4345E-03

-2.4579E-03

-3.4733E-02

-5.1424E-03

8.8666E-03

1.4788E-02

A12

0.0000E+00

A14

0.0000E+00

A16

0.0000E+00

A18

0.0000E+00

A20

0.0000E+00

TABLE 2

The relevant parameter values in this embodiment are shown in table 7, in combination with fig. 2, 3, 4 and 1, respectively, wherein d1s is the inner diameter of the first side of the first spacer element P1; d1m is the inner diameter of the second side of the first spacer element P1; d1s is the outer diameter of the first side of the first spacer element P1; d1m is the outer diameter of the second side of the first spacer element P1; d2s is the inner diameter of the first side of the second spacer element P2; d2m is the inner diameter of the second side of the second spacer element P2; d2s is the outer diameter of the first side of the second spacer element P2; d2m is the outer diameter of the second side of the second spacer element P2; d0s is the inner diameter of the first side end face 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 face of the lens barrel P0; EP01 is a distance along the optical axis from the first side end surface of the lens barrel P0 to the first side surface of the first interval element P1; CP1 is the maximum thickness of the first spacer element P1 in the direction parallel to the optical axis; EP12 is the distance along the optical axis from the second side of the first spacer element P1 to the first side of the second spacer element P2; CP2 is the maximum thickness of the second spacer element P2 in the direction parallel to the optical axis; d0bs is the inner diameter of the first side of the lens barrel auxiliary member P0 b; d0bm is the inner diameter of the second side surface of the barrel auxiliary member P0 b; d0bs is the outer diameter of the first side surface of the lens barrel auxiliary member P0 b; d0bm is the outer diameter of the second side surface of the barrel auxiliary member P0 b; and CP0b is the maximum thickness of the barrel auxiliary member P0b in the direction parallel to the optical axis. The unit of each of the above parameters shown in Table 7 is millimeter (mm).

Fig. 5 shows on-axis chromatic aberration curves for the vision system of example 1, which represent the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6 shows astigmatism curves for the visual system of example 1, which represent meridional and sagittal image surface curvature. Fig. 7 shows distortion curves for the visual system of example 1, which represent distortion magnitude values for different field angles. As can be seen from fig. 5 to 7, the visual system according to embodiment 1 can achieve good imaging quality.

Example 2

A visual system according to embodiment 2 of the present application is described below with reference to fig. 8, 9, 10, and 11, 12, and 13. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 8, 9 and 10 show schematic structural views of the visual system according to example 2 of the present application in three different embodiments (embodiment 2-1, embodiment 2-2, embodiment 2-3), respectively.

As shown in fig. 8, 9, and 10, the visual system includes a lens barrel P0 and a lens assembly mounted in the lens barrel P0, arranged in order from a first side (human eye side) to a second side (display side) along an optical axis: a reflective polarizing element RP, a first lens E1, a quarter wave plate QWP, a second lens E2, and a third lens E3; the vision system also includes an image plane IMG on the second side.

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

In this embodiment, the visualization system further comprises: a lens barrel auxiliary element P0b located between an inner end surface of the lens barrel P0 near the first side and the first lens E1, and the lens barrel auxiliary element P0b abuts against the first side surface of the first lens E1; a first spacing element P1 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.

Table 3 shows the basic parameters of the visual system of example 2, wherein the radius of curvature and the thickness/distance are both in millimeters (mm). In this example, the surfaces S2 to S21 are all aspherical, and Table 4 shows the higher order coefficients A of the aspherical surfaces S3, S4, S6 to S9 that can be used in example 2 ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ And A ₂₀ Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 3 Table 3

Coefficient/surface

S3

S4

S6

S7

S8

S9

A4

-8.4010E-02

-7.8546E-02

1.9036E-01

-2.1572E-02

5.2745E-02

-1.3152E-01

A6

2.2228E-01

1.1684E-02

1.6292E-01

2.4958E-01

-2.4073E-01

1.4465E-01

A8

-2.7025E-02

-4.2279E-02

1.1215E-01

3.7177E-02

5.8821E-02

-2.5503E-02

A10

-2.2199E-03

8.6666E-02

6.9469E-02

5.8298E-02

8.0173E-02

-2.5179E-03

A12

0.0000E+00

A14

0.0000E+00

A16

0.0000E+00

A18

0.0000E+00

A20

0.0000E+00

TABLE 4 Table 4

The values of the relevant parameters in example 2 are shown in Table 7, respectively, wherein the meanings of the parameters are as described above, and the description thereof will not be repeated, and the units of the parameters shown in Table 7 are millimeters (mm).

Fig. 11 shows on-axis chromatic aberration curves for the vision system of example 2, which represent the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12 shows astigmatism curves for the visual system of example 2, which represent meridional image surface curvature and sagittal image surface curvature. Fig. 13 shows distortion curves of the visual system of example 2, which represent distortion magnitude values corresponding to different angles of view. As can be seen from fig. 11 to 13, the visual system according to embodiment 2 can achieve good imaging quality.

Example 3

The following describes a visual system according to embodiment 3 of the present application with reference to fig. 14, 15, 16, and 17, 18, and 19. Fig. 14, 15 and 16 show schematic structural views of the visual system according to example 3 of the present application in three different embodiments (embodiment 3-1, embodiment 3-2, embodiment 3-3), respectively.

As shown in fig. 14, 15, and 16, the visual system includes a lens barrel P0 and a lens assembly mounted in the lens barrel P0, arranged in order from a first side (human eye side) to a second side (display side) along an optical axis: a reflective polarizing element RP, a first lens E1, a quarter wave plate QWP, a second lens E2, and a third lens E3; the vision system also includes an image plane IMG on the second side.

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

Table 5 shows the implementationThe basic parameters of the visual system of example 3, wherein the radius of curvature and thickness/distance are in millimeters (mm). In this example, the surfaces S2 to S21 are all aspherical, and Table 6 shows the higher order coefficients A of the aspherical surfaces S3, S4, S6 to S9 that can be used in example 3 ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ And A ₂₀ Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.

Surface of the body	Surface type	Radius of curvature	Thickness/distance	Refractive index	Abbe number	Refraction/reflection	Coefficient of taper
								S0	Spherical surface	Infinity is provided	Infinity is provided			Refraction by refraction
S1	Spherical surface	Infinity is provided	18.5927			Refraction by refraction
								S2	Aspherical surface	-71.7746	0.2000	1.60	26.13	Refraction by refraction
S3	Aspherical surface	-71.7746	1.9700	1.60	26.13	Refraction by refraction	0.0000
								S4	Aspherical surface	-95.9737	0.1000			Refraction by refraction	0.0000
S5	Aspherical surface	-140.7247	0.2000	1.50	57.00	Refraction by refraction
								S6	Aspherical surface	-140.7247	11.3197	1.56	46.39	Refraction by refraction	0.0000
S7	Aspherical surface	-40.0554	0.1000			Refraction by refraction	0.0000
								S8	Aspherical surface	-42.1444	2.0000	1.64	21.46	Refraction by refraction	0.0000
S9	Aspherical surface	-56.3156	-2.0000	1.64	21.46	Reflection of	0.0000
								S10	Aspherical surface	-42.1444	-0.1000			Refraction by refraction
S11	Aspherical surface	-40.0554	-11.3197	1.56	46.39	Refraction by refraction
								S12	Aspherical surface	-140.7247	-0.2000	1.50	57.00	Refraction by refraction
S13	Aspherical surface	-140.7247	-0.1000			Refraction by refraction
								S14	Aspherical surface	-95.9737	-1.9700	1.60	26.13	Refraction by refraction
S15	Aspherical surface	-71.7746	1.9700	1.60	26.13	Reflection of
								S16	Aspherical surface	-95.9737	0.1000			Refraction by refraction
S17	Aspherical surface	-140.7247	0.2000	1.50	57.00	Refraction by refraction
								S18	Aspherical surface	-140.7247	11.3197	1.56	46.39	Refraction by refraction
S19	Aspherical surface	-40.0554	0.1000			Refraction by refraction
								S20	Aspherical surface	-42.1444	2.0000	1.64	21.46	Refraction by refraction
S21	Aspherical surface	-56.3156	5.3828			Refraction by refraction
								S22	Spherical surface	Infinity is provided	0.0000			Refraction by refraction

TABLE 5

TABLE 6

The values of the relevant parameters in example 3 are shown in Table 7, respectively, wherein the meanings of the parameters are as described above, and the description thereof will not be repeated, and the units of the parameters shown in Table 7 are millimeters (mm).

Fig. 17 shows on-axis chromatic aberration curves for the vision system of example 3, which represent the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 18 shows astigmatism curves for the visual system of example 3, which represent meridional image surface curvature and sagittal image surface curvature. Fig. 19 shows distortion curves of the visual system of example 3, which represent distortion magnitude values corresponding to different angles of view. As can be seen from fig. 17 to 19, the visual system according to embodiment 3 can achieve good imaging quality.

Parameters/embodiments	1-1	1-2	1-3	2-1	2-2	2-3	3-1	3-2	3-3
										d1s	59.4580	58.4767	59.4580	59.8046	59.8589	59.8046	60.5125	58.4455	60.5125
d1m	59.4580	59.4318	59.4580	59.8046	60.2140	59.8046	60.5125	58.8006	60.5125
										D1s	65.5815	65.0429	65.5815	65.8197	64.4252	65.8197	65.5045	63.0118	65.5045
D1m	65.5815	64.9981	65.5815	65.8197	64.9803	65.8197	65.5045	63.5669	65.5045
										d2s	59.5674	59.5674	59.5668	59.8051	59.8051	59.8057	58.8905	58.8905	58.8893
d2m	59.5674	59.5674	59.5668	59.8046	59.8051	59.8057	58.8905	58.8905	58.8893
										D2s	67.6841	67.6841	67.6841	59.8057	67.4959	67.2959	67.8084	66.8084	67.8084
D2m	67.6841	67.6841	67.6841	59.8057	67.4959	67.2959	67.8084	66.8084	67.8084
										d0s	55.0162	59.9170	55.4071	55.7926	60.0934	55.7926	54.6006	58.6800	54.6006
D0s	60.5483	64.9758	60.5558	60.3339	65.1521	60.3339	60.2248	63.7387	60.2248
										D0m	73.3691	73.3691	73.3691	72.1063	72.1063	72.1063	72.9187	72.9187	72.9187
EP01	5.8850	5.2572	5.8329	7.0965	5.7380	7.0965	5.4864	4.9380	5.6014
										CP1	0.1000	0.8278	0.1000	0.1000	1.6084	0.1000	0.1000	1.6084	0.1000
EP12	2.3292	2.3292	2.3292	1.8704	1.8704	1.8704	2.7204	2.0506	2.4611
										CP2	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000
d0bs	53.7271	57.7271	54.1180	54.5035	57.9035	55.4753	53.7778	56.4901	53.7778
										d0bm	53.7271	57.7271	54.1180	54.5035	57.9035	55.4753	53.7778	56.4901	53.7778
D0bs	59.8506	63.8506	60.1766	60.6328	64.0328	60.6328	58.9608	62.4194	59.1608
										D0bm	59.8506	63.8506	60.1766	60.6328	64.0328	60.6328	58.9608	62.4194	59.1608
CP0b	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000

TABLE 7

Further, in examples 1 to 3, the effective focal length FG1 of the first element group, the effective focal length f of the visual system, the entrance pupil diameter EPD of the visual system, the distance TD along the optical axis between the first side surface of the first lens and the second side surface of the third lens, the center thickness CTR of the reflective polarizing element on the optical axis, and the center thickness CTQ of the quarter-wave plate on the optical axis are shown in table 8.

Parameters/embodiments	1	2	3
				FG1(mm)	27.34	27.92	27.34
f(mm)	28.43	28.44	28.43
				EPD(mm)	5.00	5.00	5.00
TD(mm)	15.69	14.27	15.69
				CTR(mm)	0.20	0.20	0.20
CTQ(mm)	0.30	0.20	0.20

TABLE 8

Examples 1 to 3 each satisfy the conditions shown in table 9.

TABLE 9

The present application also provides an imaging device provided with an electron-sensitive element for imaging, which may be a photosensitive coupling element (Charge Coupled Device, CCD) or a complementary metal oxide semiconductor element (Complementary Metal Oxide Semiconductor, CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the above-described visual system.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It should be understood by those skilled in the art that the scope of protection referred to in this application is not limited to the specific combination of the above technical features, but also encompasses other technical solutions formed by any combination of the above technical features or their equivalents without departing from the spirit of the application. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

1. The visual system is characterized by comprising a lens barrel, a first element group and a second element group which are assembled in the lens barrel and are sequentially arranged from a first side to a second side along an optical axis, wherein,

the first element group has positive focal power and comprises a reflective polarizing element, a first lens, a quarter wave plate and a second lens;

the second element group has positive optical power or negative optical power and comprises a third lens;

a first spacing element is arranged between the first lens and the second lens, and a second spacing element is arranged between the second lens and the third lens;

the visual system satisfies:

1.5<FG1/(CT1+CP1+CT2)<3，

FG1 is an effective focal length of the first element group, CT1 is a center thickness of the first lens on the optical axis, CP1 is a maximum thickness of the first spacer element along a direction parallel to the optical axis, and CT2 is a center thickness of the second lens on the optical axis.

2. The visual system of claim 1, wherein the radius of curvature R3 of the first side of the second lens, the inner diameter d1s of the first side of the first spacer element, and the inner diameter d1m of the second side of the first spacer element satisfy:

1<|R3|/(d1s+d1m)<2.5。

3. the visualization system of claim 1, wherein a distance EP12 along the optical axis from the second side of the first spacer element to the first side of the second spacer element, a distance T12 on the optical axis from the second side of the first lens to the first side of the second lens, and a center thickness CTQ of the quarter wave plate on the optical axis satisfy:

3.2<EP12/(T12+CTQ)<5.6。

4. the visual system of claim 1, wherein an inner diameter D2s of the first side of the second spacer element, an outer diameter D2s of the first side of the second spacer element, and a radius of curvature R4 of the second side of the second lens satisfy:

-4<(d2s+D2s)/R4<-2。

5. the vision system of claim 1, wherein an inner diameter d0s of the first side end surface of the lens barrel and an entrance pupil diameter EPD of the vision system satisfy:

10.5<d0s/EPD<12.5。

6. the visual system of claim 1, wherein an inner diameter D2m of the second side of the second spacer element, an outer diameter D2m of the second side of the second spacer element, and a radius of curvature R5 of the first side of the third lens satisfy:

-3.5<(d2m+D2m)/R5<-1.5。

7. the visualization system of any of claims 1-6, further comprising a barrel auxiliary element positioned between an inner end surface of the barrel proximate the first side and the first lens and abutting a first side surface of the first lens;

the radius of curvature R1 of the first side surface of the first lens, the radius of curvature R2 of the second side surface of the first lens, the inner diameter d0bs of the first side surface of the barrel auxiliary member, and the inner diameter d0bm of the second side surface of the barrel auxiliary member satisfy:

2<(R1×R2)/(d0bs×d0bm)<4。

8. the visual system according to any one of claims 1 to 6, wherein an effective focal length f of the visual system, an outer diameter D0m of the second side end face of the lens barrel, and an outer diameter D0s of the first side end face of the lens barrel satisfy:

2.2<f/(D0m-D0s)<4.2。

9. the visualization system of any of claims 1-6, further comprising a barrel auxiliary element positioned between an inner end surface of the barrel proximate the first side and the first lens and abutting a first side surface of the first lens;

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 CP0b of the barrel auxiliary element in the direction parallel to the optical axis, and the maximum thickness CP2 of the second spacer element in the direction parallel to the optical axis satisfy:

7.5<TD/(CP0b+CP1+CP2)<52.5。

10. the visual system of any one of claims 1 to 6, wherein an outer diameter D1s of the first side of the first spacer element and an outer diameter D1m of the second side of the first spacer element satisfy:

4<(D1s+D1m)/FG1<5。

11. the visual system according to any one of claims 1 to 6, wherein a distance EP01 from a first side end surface of the lens barrel to a first side surface of the first spacer element along the optical axis and a center thickness CTR of the reflective polarizing element on the optical axis satisfy:

2<EP01/(CTR+CT1)<3.5。

12. the visualization system of any of claims 1-6, further comprising a barrel auxiliary element positioned between an inner end surface of the barrel proximate the first side and the first lens and abutting a first side surface of the first lens;

an outer diameter D0bs of the first side surface of the barrel auxiliary member, an outer diameter D0bm of the second side surface of the barrel auxiliary member, and a radius of curvature R6 of the second side surface of the third lens satisfy:

-2.5<(D0bs+D0bm)/R6<-2。

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