CN220019989U

CN220019989U - Visual system and VR equipment comprising same

Info

Publication number: CN220019989U
Application number: CN202321076166.2U
Authority: CN
Inventors: 赵世一; 梁宁; 游金兴; 张晓彬; 戴付建; 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: 2023-11-14
Anticipated expiration: 2033-05-05

Abstract

The utility model discloses a visual system, which comprises 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 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 and the outer diameter D1s of the first side face of the first spacing element and the inner diameter D1s of the first side face of the first spacing element satisfy 3< fg1/(D1 s-D1 s) <6.

Description

Visual system and VR equipment comprising same

Technical Field

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

Background

Since the concept of "meta universe" was proposed, AR (augmented reality)/VR (virtual reality) has emerged as a trigger for the second development. As an entrance to human-computer interaction, VR imaging lenses play an important role. On one hand, the imaging quality of the VR imaging lens needs to meet the resolution requirement of human eyes; on the other hand, the aspheric surface or fresnel lens body in the early stage is long, and when the user experiences, the center of gravity of the device is positioned forward, so that the experience is poor, and improvement is needed.

Based on the above requirements, a foldback scheme is proposed, and the body length of the lens can be significantly compressed, for example, can be compressed to half of the original length by folding the optical path, so that the center of gravity of the display device is moved backwards, and the experience of consumers is improved. Currently, VR devices based on optical path refraction have been released, however, from the perspective of user experience, the external view field picture is blurred, and the imaging quality of the two-lens is to be improved. In addition, the presence of stray light between lenses also severely affects the imaging quality of the system.

Thus, based on the current state of development, those skilled in the art would like to further compress the body height, improve imaging quality, make the consumer better immersive experience, and promote further development and application of VR technology by improving the design.

Disclosure of Invention

The utility model 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 and a second lens; the second element group has positive optical power or negative optical power and comprises a third lens; and, a first spacing element is provided between the first lens and the second lens, and a second spacing element is provided between the second lens and the third lens. The effective focal length FG1 of the first element group, the outer diameter D1s of the first side of the first spacing element, and the inner diameter D1s of the first side of the first spacing element may satisfy: 3< FG1/(D1 s-D1 s) <6.

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 maximum thickness CP1 of the first spacer element along a direction parallel to the optical axis, a center thickness CTR of the reflective polarizing element on the optical axis, and a center thickness CT1 of the first lens on the optical axis may satisfy: 1.5< (EP 01+CP1)/(CTR+CT1) <3.5.

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

In one embodiment, the radius of curvature R1 of the first side surface of the first lens and the inner diameter d0s of the first side end surface of the lens barrel may satisfy: -3.5< R1/d0s < -0.5.

In one embodiment, the radius of curvature R2 of the second side of the first lens, the radius of curvature R3 of the first side of the second lens, the inner diameter D1m of the second side of the first spacing element, and the outer diameter D1m of the second side of the first spacing element may satisfy: 1.5< (R2×R3)/(d1mxD1m) <6.

In one embodiment, a distance L along the optical axis from the first side end surface of the lens barrel to the second side end surface of the lens barrel, and a distance TD along the optical axis from the first side surface of the first lens to the second side surface of the third lens may satisfy: 0.6< L/TD <1.6.

In one embodiment, a center thickness CT2 of the second lens on the optical axis, a distance T23 from the second side of the second lens to the first side of the third lens along the optical axis, a distance EP12 from the second side of the first spacer element to the first side of the second spacer element along the optical axis, and a maximum thickness CP2 of the second spacer element along a direction parallel to the optical axis may satisfy: 2.1< (CT2+T23)/(EP 12+CP2) <4.7.

In one embodiment, the visual system further comprises: the lens barrel auxiliary element is positioned between the inner end surface of the lens barrel, which is close to the first side, and the first lens, and is propped against the first side surface of the first lens, and the inner diameter d0bs of the first side surface of the lens barrel auxiliary element, the inner diameter d0bm of the second side surface of the lens barrel auxiliary element and the effective focal length f of the visual system can meet the following conditions: 3.3< (d0bs+d0bm)/f <4.3.

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

In one embodiment, the first element group further comprises: the quarter wave plate is located on the first side surface or the second side surface of the second lens, the maximum thickness CP0b of the lens barrel auxiliary element along the direction parallel to the optical axis, the maximum thickness CP1 of the first spacing element along the direction parallel to the optical axis, the central thickness CTR of the reflective polarizing element on the optical axis, and the central thickness CTQ of the quarter wave plate on the optical axis can satisfy: 0.3< (CP 0b+cp 1)/(ctr+ctq) <7.8.

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

In one embodiment, an outer diameter D0m of the second side end surface of the lens barrel, an inner diameter D0m of the second side end surface of the lens barrel, and a center thickness CT3 of the third lens on the optical axis may satisfy: 1< (D0 m-D0 m)/CT 3<1.5.

In another aspect, the present utility model 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 utility model discloses a visual system, which 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 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; at the same time, the effective focal length FG1 of the first element group, the outer diameter D1s of the first side surface of the first spacing element, and the inner diameter D1s of the first side surface of the first spacing element are controlled to satisfy the condition 3< fg1/(D1 s-D1 s) <6. The arrangement of the visual system disclosed by the utility model is beneficial to controlling the light emergent angles of the first lens and the second lens, weakening the stray light risk at the first interval element and further improving the imaging quality of the visual system.

Drawings

Other features, objects and advantages of the present utility model 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 utility model;

FIGS. 2, 3 and 4 show schematic structural views of the visual system according to example 1 of the present utility model 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 are schematic views showing the structure of the visual system according to example 2 of the present utility model 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 utility model 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 utility model, various aspects of the utility model will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the utility model and is not intended to limit the scope of the utility model 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 utility model.

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 utility model, use of "may" means "one or more embodiments of the utility model. 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 utility model 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, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The following examples merely illustrate a few embodiments of the present utility model, which are described in greater detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

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

The vision system according to an exemplary embodiment of the present utility model 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, 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 utility model may satisfy the condition 3< fg1/(D1 s-D1 s) <6, where FG1 is the effective focal length of the first element group, D1s is the outer diameter of the first side of the first spacing element, and D1s is the inner diameter of the first side of the first spacing element. It will be appreciated that the surface of each element in the visual system 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.

The visual system provided according to an exemplary embodiment of the present utility model includes 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 optical power and includes a reflective polarizing element, a first lens, 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; at the same time, the effective focal length FG1 of the first element group, the outer diameter D1s of the first side surface of the first spacing element, and the inner diameter D1s of the first side surface of the first spacing element are controlled to satisfy the condition 3< fg1/(D1 s-D1 s) <6. By this arrangement of the visual system, the light exit angles of the first lens and the second lens are advantageously controlled, the risk of stray light at the first spacer element is reduced, and the imaging quality of the visual system is further improved.

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 visual system of the present utility model may satisfy the conditional expression 1.5< (EP 01+cp 1)/(ctr+ct 1) <3.5, wherein EP01 is a distance from a first side end surface of the barrel (i.e., an end surface or surface closest to the first side of the barrel) to a first side surface of the first spacing element along the optical axis, CP1 is a maximum thickness of the first spacing element in a direction parallel to 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. By controlling the ratio of the sum of the distance from the first side end surface of the lens barrel to the first side surface of the first spacing element along the optical axis and the maximum thickness of the first spacing element along the direction parallel to the optical axis to the sum of the central thickness of the reflective polarizing element on the optical axis and the central thickness of the first lens on the optical axis within the range, the edge thickness of the first lens and the thickness of the first spacing element are reasonably distributed, and the workability of the first lens and the first spacing element can be improved on the premise of ensuring the assembly of the system.

In an exemplary embodiment, the visual system of the present utility model may satisfy the conditional expression 0.5< |fg2|/(d2m+d2m) <9.5, where FG2 is the effective focal length of the second element group, D2m is the inner diameter of the second side of the second spacing element, and D2m is the outer diameter of the second side of the second spacing element. The shape of the third lens can be limited by controlling the effective focal length of the second element group, the inner diameter of the second side surface of the second spacing element and the outer diameter of the second side surface of the second spacing element to meet the condition of 0.5< |FG2|/(d2m+D2m) <9.5, which is beneficial to reducing the sensitivity of the third lens, thereby improving the yield of the assembly; and the workability of the second spacer member can be ensured while satisfying the structural support to the lens by controlling the inner diameter and the outer diameter of the second side surface of the second spacer member.

In an exemplary embodiment, the visual system of the present utility model may satisfy the conditional expression-3.5 < R1/d0s < -0.5, where R1 is a radius of curvature of the first side surface of the first lens and d0s is an inner diameter of the first side end surface of the lens barrel. By controlling the ratio of the curvature radius of the first side surface of the first lens to the inner diameter of the first side end surface of the lens barrel within the range, the focal power value of the first lens can be limited, so that the light rays of the first lens have better trend, and the improvement of the image quality and the relative illumination of the system is facilitated.

In an exemplary embodiment, the visual system of the present utility model may satisfy the conditional expression 1.5< (r2×r3)/(d1m× d1m) <6, where R2 is a radius of curvature of the second side of the first lens, R3 is a radius of curvature of the first side of the second lens, D1m is an inner diameter of the second side of the first spacer element, and D1m is an outer diameter of the second side of the first spacer element. The radius of curvature of the second side surface of the first lens, the radius of curvature of the first side surface of the second lens, the inner diameter of the second side surface of the first spacing element and the outer diameter of the second side surface of the first spacing element are controlled to satisfy the condition 1.5< (R2×R3)/(d1mxD1m) <6, and the radius of curvature of the second side surface of the first lens and the first side surface of the second lens is limited, so that the sensitivity of the first lens and the second lens is reduced, and the yield of assembly is improved; and the workability of the first spacer element can be ensured while satisfying the lens support property of the first spacer element structure by controlling the inner diameter and the outer diameter of the second side surface of the first spacer element.

In an exemplary embodiment, the visual system of the present utility model may satisfy the conditional expression 0.6< L/TD <1.6, where L is a distance along the optical axis from the first side end face of the barrel to the second side end face of the barrel, i.e., a distance along the optical axis from the end face or surface closest to the first side of the barrel to the end face or surface closest to the second side of the barrel, and TD is a distance along the optical axis from the first side of the first lens to the second side of the third lens. The ratio of the distance from the first side end face of the lens barrel to the second side end face of the lens barrel along the optical axis to the distance from the first side face of the first lens to the second side face of the third lens along the optical axis is controlled within the range, so that the overall thickness of the lens assembly can be limited, the rear gravity center of the display device is facilitated, and the experience of the display device is guaranteed.

In an exemplary embodiment, the visual system of the present utility model may satisfy the conditional expression 2.1< (CT 2+t23)/(EP 12+cp 2) <4.7, wherein CT2 is a center thickness of the second lens on the optical axis, T23 is a distance from the second side of the second lens to the first side of the third lens along the optical axis, 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, and CP2 is a maximum thickness of the second spacer element along a direction parallel to the optical axis. By controlling the ratio of the center thickness of the second lens on the optical axis to the sum of the distances from the second side surface of the second lens to the first side surface of the third lens along the optical axis, to the sum of the distances from the second side surface of the first spacer element to the first side surface of the second spacer element along the optical axis and the maximum thickness of the second spacer element along the direction parallel to the optical axis in this range, the edge thickness of the second lens and the thickness of the second spacer element are reasonably distributed, and the workability of the second lens and the second spacer element can be improved on the premise of ensuring the system assembly.

In an exemplary embodiment, the visual system of the present utility model 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. The visual system of the utility model can satisfy the condition 3.3< (d0bs+d0bm)/f <4.3, wherein d0bs is the inner diameter of the first side surface of the lens barrel auxiliary element, d0bm is the inner diameter of the second side surface of the lens barrel auxiliary element, and f is the effective focal length of the visual system. By controlling the ratio of the sum of the inner diameter of the first side of the lens barrel auxiliary element and the inner diameter of the second side of the lens barrel auxiliary element to the effective focal length of the visual system within the range, the appearance of the lens barrel auxiliary element is reasonably limited, and the workability of the lens barrel auxiliary element can be improved on the premise of ensuring the assembly of the system.

In an exemplary embodiment, the inventive visual system may satisfy the conditional expression 11.2< D0s/EPD <13.2, where D0s is the outer diameter of the first side end surface of the lens barrel and EPD is the entrance pupil diameter of the visual system. By controlling the ratio of the outer diameter of the first side end surface of the lens barrel to the entrance pupil diameter of the visual system within the range, the appearance of the lens barrel element is limited, the size of the lens assembly is reduced as much as possible on the premise of ensuring the processability of the lens barrel element, and the experience of the display device can be improved.

In an exemplary embodiment, the visual system of the present utility model 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. The first element group may further include a quarter wave plate, which may be located at the first side or the second side of the second lens. The visual system of the utility model can satisfy the condition of 0.3< (CP 0b+cp 1)/(ctr+ctq) <7.8, wherein CP0b is the maximum thickness of the lens barrel auxiliary element in the direction parallel to the optical axis, CP1 is the maximum thickness of the first spacer element in the direction parallel to the optical axis, CTR is the central thickness of the reflective polarizing element on the optical axis, and CTQ is the central thickness of the quarter-wave plate on the optical axis. The ratio of the maximum thickness of the lens barrel auxiliary element along the direction parallel to the optical axis to the maximum thickness of the first interval element along the direction parallel to the optical axis to the sum of the central thickness of the reflective polarizing element on the optical axis and the central thickness of the quarter wave plate on the optical axis is controlled within the range, the thicknesses of the reflective polarizing element and the quarter wave plate are limited, and the loss of the reflective polarizing element and the quarter wave plate to light is reduced as much as possible on the premise that the optical folding requirement is met, so that the imaging quality is improved.

In an exemplary embodiment, the visual system of the present utility model may satisfy the conditional expression 0.4< (r4×r5)/(d2s×d2s) <1.6, where R4 is a radius of curvature of the second side of the second lens, R5 is a radius of curvature of the first side of the third lens, D2s is an inner diameter of the first side of the second spacer element, and D2s is an outer diameter of the first side of the second spacer element. The curvature radius of the second side surface of the second lens, the curvature radius of the first side surface of the third lens, the inner diameter of the first side surface of the second spacing element and the outer diameter of the first side surface of the second spacing element are controlled to meet the condition of 0.4< (R4×R5)/(d2s×D2s) <1.6, so that the sensitivity of the second lens and the third lens is reduced, and the assembly yield is improved; and the workability of the second spacer element can be ensured while satisfying the lens support property of the second spacer element structure.

In an exemplary embodiment, the vision system of the present utility model may satisfy the condition 1< (D0 m-D0 m)/CT 3<1.5, where D0m is an outer diameter of a second side end surface of the lens barrel (i.e., an end surface or surface of the lens barrel closest to the second side), D0m is an inner diameter of the second side end surface of the lens barrel, and CT3 is a center thickness of the third lens on the optical axis. By controlling the ratio of the difference between the outer diameter of the second side end surface of the lens barrel and the inner diameter of the second side end surface of the lens barrel to the center thickness of the third lens on the optical axis within the range, the overall dimension of the lens barrel can be made as small as possible on the premise of ensuring the processability of the lens barrel, thereby reducing the overall dimension.

In an exemplary embodiment, the vision system of the present disclosure 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 utility model, by providing 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 optical power and includes a reflective polarizing element, a first lens, 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; at the same time, the effective focal length FG1 of the first element group, the outer diameter D1s of the first side surface of the first spacing element, and the inner diameter D1s of the first side surface of the first spacing element are controlled to satisfy the condition 3< fg1/(D1 s-D1 s) <6. The arrangement of the visual system disclosed by the utility model is beneficial to controlling the light emergent angles of the first lens and the second lens, weakening the stray light risk at the first interval element and further improving the imaging quality of the visual system.

According to the visual system provided by the embodiment of the utility model, the height of the body can be better compressed and the imaging quality can be improved by designing a three-piece foldback scheme, adopting a curved surface attached two-piece type composite film design and the like.

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

Example 1

A visual system according to embodiment 1 of the present utility model is described below 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 utility model 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 second lens E2, a quarter wave plate QWP, and a third lens E3; the vision system also includes an image plane IMG.

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

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

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
							S0	Spherical surface	Infinity is provided	Infinity is provided			Refraction by refraction
S1	Spherical surface	Infinity is provided	20.1956			Refraction by refraction
							S2	Aspherical surface	-51.2244	0.2000	1.50	57.00	Refraction by refraction
S3	Aspherical surface	-51.2244	2.0894	1.67	19.00	Refraction by refraction
							S4	Aspherical surface	-62.2238	0.1000			Refraction by refraction
S5	Aspherical surface	-99.9462	7.2109	1.54	56.00	Refraction by refraction
							S6	Aspherical surface	-48.9883	0.2000	1.50	57.00	Refraction by refraction
S7	Aspherical surface	-48.9883	3.3357			Refraction by refraction
							S8	Aspherical surface	-45.1915	-3.3357			Reflection of
S9	Aspherical surface	-48.9883	-0.2000	1.50	57.00	Refraction by refraction
							S10	Aspherical surface	-48.9883	-7.2109	1.54	56.00	Refraction by refraction
S11	Aspherical surface	-99.9462	-0.1000			Refraction by refraction
							S12	Aspherical surface	-62.2238	-2.0894	1.67	19.00	Refraction by refraction
S13	Aspherical surface	-51.2244	2.0894	1.67	19.00	Reflection of
							S14	Aspherical surface	-62.2238	0.1000			Refraction by refraction
S15	Aspherical surface	-99.9462	7.2109	1.54	56.00	Refraction by refraction
							S16	Aspherical surface	-48.9883	0.2000	1.50	57.00	Refraction by refraction
S17	Aspherical surface	-48.9883	3.3357			Refraction by refraction
							S18	Aspherical surface	-45.1915	2.3734	1.67	19.00	Refraction by refraction
S19	Aspherical surface	-46.4248	3.2053			Refraction by refraction
							S20	Spherical surface	Infinity is provided	0.0000			Refraction by refraction

TABLE 1

In embodiment 1, the surfaces S2 to S19 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. Table 2 below shows the higher order coefficients A that can be used for the respective aspheres S3 to S6 and S18 and S19 in example 1 ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ And A ₂₀ 。

Coefficient/surface

S3

S4

S5

S6

S18

S19

A4

-2.8936E-01

-1.5113E-01

1.3327E-01

-4.8905E-03

-2.8988E-01

2.6714E-01

A6

1.9843E-01

-2.6197E-01

-2.7377E-01

3.2017E-01

8.8077E-02

-2.4404E-02

A8

-7.2904E-03

3.0361E-02

-4.9264E-03

-1.2643E-01

5.3540E-03

-1.8751E-01

A10

-1.6157E-03

5.3787E-03

-1.1425E-02

2.2082E-02

-7.6645E-03

9.1382E-03

A12

0.0000E+00

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; d0m is the inner diameter of the second side end surface of the lens barrel P0; d0s is the outer diameter of the first side end surface of the lens barrel P0; d0m is the outer diameter of the second side end 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; l is the distance from the first side end surface of the lens barrel P0 to the second side end surface of the lens barrel P0 along the optical axis; 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; 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 utility model 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 utility model 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.

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. The second element group has a negative optical power.

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 S19 are all aspherical, and Table 4 shows the higher order coefficients A of the aspherical surfaces S3, S4, S6, S7, S18 and S19 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

S18

S19

A4

1.9887E-01

-1.9268E-01

2.3843E-01

-5.2062E-02

2.7880E-01

-2.3371E-01

A6

1.4662E-01

-4.2712E-02

-1.4118E-01

2.9558E-01

7.2087E-02

-1.6573E-01

A8

-3.8664E-02

-1.4715E-01

2.1236E-02

9.3743E-02

-2.4548E-02

-7.1272E-02

A10

-6.5591E-03

-3.1046E-03

1.4213E-04

3.0666E-04

-2.9853E-03

7.2500E-03

A12

0.0000E+00

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

A visual system according to embodiment 3 of the present utility model is described below 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 utility model 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.

Table 5 shows the basic parameters of the visual system of example 3, 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 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
							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
							S4	Aspherical surface	-95.9737	0.1000			Refraction by refraction
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
S7	Aspherical surface	-40.0554	0.1000			Refraction by refraction
							S8	Aspherical surface	-42.1444	2.0000	1.64	21.46	Refraction by refraction
S9	Aspherical surface	-56.3156	-2.0000	1.64	21.46	Reflection of
							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 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	57.7864	54.6154	54.6154	57.3707	57.3707	57.3707	59.4580	58.4767	59.4580
d1m	57.7864	56.8515	56.4515	59.0434	59.0434	59.0429	59.4580	59.4318	59.4580
										D1s	64.6617	62.6762	61.1762	61.7664	61.7664	61.7664	65.5815	65.0429	65.5815
D1m	64.6617	63.0670	61.5670	63.3536	63.3536	63.3531	65.5815	64.9981	65.5815
										d2s	59.5585	59.5585	63.3121	59.7548	59.2865	59.2865	59.5674	59.5674	59.5668
d2m	60.6808	60.6808	63.3121	59.0954	59.2865	59.2865	59.5674	59.5674	59.5668
										D2s	64.3542	64.3542	68.5212	64.0361	66.8426	67.4426	67.6841	67.6841	67.6841
D2m	65.7352	65.7352	68.5212	64.2987	66.8426	67.4426	67.6841	67.6841	67.6841
										d0s	51.1312	51.1312	51.1312	56.9290	56.9290	56.9290	55.0162	59.9170	55.4071
d0m	71.0652	71.0652	71.0652	69.3277	69.3277	69.9277	70.9535	70.9535	70.9535
										D0s	59.5737	64.5963	64.5963	64.4639	64.4639	64.4639	60.5483	64.9758	60.5558
D0m	74.0531	74.0531	74.0531	71.9277	71.9277	72.5277	73.3691	73.3691	73.3691
										EP01	7.0717	6.2725	6.2725	4.3231	4.3231	4.4231	5.8850	5.2572	5.8329
CP1	0.1000	1.3759	1.3759	2.9906	2.9906	2.7906	0.1000	0.8278	0.1000
										EP12	2.2649	1.7882	3.3725	1.9295	2.1799	2.5799	2.3292	2.3292	2.3292
CP2	1.6843	1.6843	0.1000	0.9535	0.1000	0.1000	0.1000	0.1000	0.1000
										L	15.7856	15.7856	15.7856	17.9176	17.9176	17.9176	13.3856	13.4856	13.3335
d0bs	50.4789	50.4789	50.4789	56.3935	56.3935	56.3935	53.7271	57.7271	54.1180
										d0bm	50.4789	50.4789	50.4789	56.3935	56.3935	56.3935	53.7271	57.7271	54.1180
CP0b	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000	0.1000

TABLE 7

Further, in examples 1 to 3, the effective focal length FG1 of the first element group, the effective focal length FG2 of the second element group, the effective focal length f of the visual system, the entrance pupil diameter EPD of the visual system, the distance TD 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)	26.83	25.58	27.34
FG2(mm)	1186.53	-98.95	-258.94
				f(mm)	27.33	29.05	28.43
EPD(mm)	5.00	5.00	5.00
				TD(mm)	15.31	12.71	15.69
CTR(mm)	0.20	0.20	0.20
				CTQ(mm)	0.20	0.20	0.30

Table 8 examples 1 to 3 each satisfy the conditions shown in table 9.

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

TABLE 9

The utility model also provides an imaging device provided with an electron-sensitive element for imaging, which can 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 above description is only illustrative of the preferred embodiments of the present utility model and of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the utility model is not limited to the specific combination of the above technical features, but also encompasses other technical features which may be combined with any combination of the above technical features or their equivalents without departing from the spirit of the utility model. Such as the above-mentioned features and the technical features disclosed in the present utility model (but not limited to) having similar functions 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 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:

3<FG1/(D1s-d1s)<6，

where FG1 is the effective focal length of the first element group, D1s is the outer diameter of the first side of the first spacing element, and D1s is the inner diameter of the first side of the first spacing element.

2. The visual system according to claim 1, 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, a maximum thickness CP1 of the first spacer element along a direction parallel to the optical axis, a center thickness CTR of the reflective polarizing element on the optical axis, and a center thickness CT1 of the first lens on the optical axis satisfy:

1.5<(EP01+CP1)/(CTR+CT1)<3.5。

3. the visual system of claim 1, wherein the effective focal length FG2 of the second set of elements, the inner diameter D2m of the second side of the second spacer element, and the outer diameter D2m of the second side of the second spacer element satisfy:

0.5<|FG2|/(d2m+D2m)<9.5。

4. the visualization system of claim 1, wherein the radius of curvature R1 of the first side surface of the first lens and the inner diameter d0s of the first side end surface of the barrel satisfy:

-3.5<R1/d0s<-0.5。

5. the visual system of claim 1, wherein a radius of curvature R2 of the second side of the first lens, a radius of curvature R3 of the first side of the second lens, an inner diameter D1m of the second side of the first spacer element, and an outer diameter D1m of the second side of the first spacer element satisfy:

1.5<(R2×R3)/(d1m×D1m)<6。

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

0.6<L/TD<1.6。

7. the visual system according to any one of claims 1 to 6, wherein a center thickness CT2 of the second lens on the optical axis, a distance T23 from the second side of the second lens to the first side of the third lens along the optical axis, a distance EP12 from the second side of the first spacer element to the first side of the second spacer element along the optical axis, and a maximum thickness CP2 of the second spacer element along a direction parallel to the optical axis satisfy:

2.1<(CT2+T23)/(EP12+CP2)<4.7。

8. the visual system of any one of claims 1 to 6, further comprising: the lens barrel auxiliary element is positioned between the inner end surface of the lens barrel, which is close to the first side, and the first lens and is propped against the first side surface of the first lens;

an inner diameter d0bs of the first side of the barrel auxiliary element, an inner diameter d0bm of the second side of the barrel auxiliary element, and an effective focal length f of the vision system satisfy:

3.3<(d0bs+d0bm)/f<4.3。

9. the visual system according to any one of claims 1 to 6, wherein an outer diameter D0s of the first side end surface of the lens barrel and an entrance pupil diameter EPD of the visual system satisfy:

11.2<D0s/EPD<13.2。

10. the visualization system of claim 8, wherein the first element set further comprises: a quarter wave plate positioned on the first side or the second side of the second lens,

the maximum thickness CP0b of the lens barrel auxiliary element in the direction parallel to the optical axis, the maximum thickness CP1 of the first spacer element in the direction parallel to the optical axis, the central thickness CTR of the reflective polarizing element on the optical axis, and the central thickness CTQ of the quarter-wave plate on the optical axis satisfy:

0.3<(CP0b+CP1)/(CTR+CTQ)<7.8。

11. the visual system of any one of claims 1 to 6 wherein the radius of curvature R4 of the second side of the second lens, the radius of curvature R5 of the first side of the third lens, the inner diameter D2s of the first side of the second spacer element and the outer diameter D2s of the first side of the second spacer element satisfy:

0.4<(R4×R5)/(d2s×D2s)<1.6。

12. the visual system according to any one of claims 1 to 6, wherein an outer diameter D0m of the second side end surface of the lens barrel, an inner diameter D0m of the second side end surface of the lens barrel, and a center thickness CT3 of the third lens on the optical axis satisfy:

1<(D0m-d0m)/CT3<1.5。

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.