CN220626780U

CN220626780U - Virtual reality system

Info

Publication number: CN220626780U
Application number: CN202322089331.4U
Authority: CN
Inventors: 游金兴; 陈威望; 宋立通; 姚嘉诚; 王丽; 金银芳; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2023-08-04
Filing date: 2023-08-04
Publication date: 2024-03-19
Anticipated expiration: 2033-08-04

Abstract

The application discloses a virtual reality system, comprising a first optical system and a second optical system, wherein the first optical system comprises a first lens barrel, a first spacing element, a second spacing element, a third spacing element, a fourth spacing element and a first element group, wherein the first spacing element, the second spacing element and the fourth spacing element are arranged in sequence from a first side to a second side along a first optical axis; the first element group comprises a first lens, a reflective polarizing element and a first quarter wave plate; the second element group comprises a second lens and a second quarter wave plate; the third and fourth element groups respectively comprise a third lens and a fourth lens. The second optical system comprises a second lens barrel, first to third positioning elements accommodated in the second lens barrel and first to fifth lenses sequentially arranged from an object side to an image side along a second optical axis. The maximum field angle of the first optical system and the second optical system and the inner diameter of the end face of the first lens barrel and the second lens barrel, which is closest to the first side, satisfy 1.0< [ tan (FOV/2) x d0s ]/[ tan (FOV '/2) x d0s' ] <2.5.

Description

Virtual reality system

Technical Field

The application relates to the field of optical devices, in particular to a virtual reality system.

Background

With the development of virtual reality technology, more and more shots are applied to various devices of virtual reality technology, and immersive experience and seamless interaction of virtual and reality are one of the key development directions of virtual reality devices. To enhance immersion, enhance the user experience, virtual reality devices typically have been configured with different types of other lenses in addition to the eyepiece that provides immersion, including, for example, a perspective lens that provides interaction with reality, a positioning lens that captures motion, a facial recognition lens that builds expression, and so forth.

For the current development situation of the virtual reality device, how to design and optimize various lenses, such as an eyepiece and a positioning lens, included in the virtual reality device so as to reduce the weight and the size of equipment while guaranteeing the optical performance of the lenses, and enable a real scene photographed by the positioning lens to be projected into the virtual world more reasonably so as to further improve the experience of a user, so that the device is one of the technical problems which are solved by the current technicians in the field.

Disclosure of Invention

The present application provides a virtual reality system that at least solves or partially solves at least one problem, or other problems, present in the prior art.

An aspect of the present application provides a virtual reality system, which may include a first optical system and a second optical system, the first optical system may include a first barrel and a spacer element group accommodated in the first barrel, and a first element group, a second element group, a third element group, and a fourth element group sequentially arranged from a first side to a second side along a first optical axis, wherein the first element group includes a first lens, a reflective polarizing element, and a first quarter wave plate; the second element group comprises a second lens and a second quarter wave plate; the third element group includes a third lens; the fourth element group includes a fourth lens; the set of spacing elements includes a first spacing element, a second spacing element, and a third spacing element; the second optical system may include a second lens barrel, and a positioning element group accommodated in the second lens barrel, and a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged from an object side to an image side along a second optical axis, wherein the positioning element group includes a first positioning element, a second positioning element, and a third positioning element. The real image formed by the second optical system may be transmitted to the first optical system in an electrical signal manner, and the first optical system may be used to project a virtual reality image and the real image of the image surface disposed on the second side. And the maximum field angle FOV of the second optical system, the inner diameter d0s of the end face of the second barrel closest to the object side, the maximum field angle FOV 'of the first optical system, and the inner diameter d0s' of the end face of the first barrel closest to the first side may satisfy: 1.0< [ tan (FOV/2) x d0s ]/[ tan (FOV '/2) x d0s' ] <2.5.

According to an exemplary embodiment of the present application, an inner diameter d0m' of an end surface of the first barrel closest to the second side and an inner diameter d0m of an end surface of the second barrel closest to the second side may satisfy: 1.0< (d 0s '-d0 m')/(d 0s-d0 m) <4.0.

According to an exemplary embodiment of the present application, a maximum height L 'of the first lens barrel in the first optical axis direction, a maximum height L of the second lens barrel in the second optical axis direction, an effective focal length f' of the first optical system, and an effective focal length f of the second optical system may satisfy: (L '+L)/(f' +f) <3.0.

According to an exemplary embodiment of the present application, the outer diameter D0s 'of the end surface of the first barrel closest to the first side and the distance TD' between the first side surface of the first element group and the second side surface of the fourth element group on the first optical axis may satisfy: 2.0< D0s '/TD' <5.0, and the distance TD between the outer diameter D0s of the end surface of the second lens barrel closest to the object side and the distance TD between the object side of the first lens and the image side of the fifth lens on the second optical axis may satisfy: 0< D0s/TD <2.0.

According to an exemplary embodiment of the present application, a radius of curvature R2' of the second side surface of the first lens, a radius of curvature R8' of the second side surface of the fourth lens, a maximum height L ' of the first lens barrel in the first optical axis direction, a radius of curvature R1 of the object side surface of the first lens, a radius of curvature R10 of the image side surface of the fifth lens, and a maximum height L of the second lens barrel in the second optical axis direction may satisfy: -10.0< [ (r2 ' +r8 ')/L ' ]/[ |r1+r10|/L ] < -5.0.

According to an exemplary embodiment of the present application, the first spacer element is located on the second side of the first lens and is at least partly in contact with the second side of the first lens; the second spacer element is located on the second side of the second lens and is at least partially in contact with the second side of the second lens; the distance EP12 'between the second side of the first spacing element and the first side of the second spacing element along the first optical axis direction, the effective focal length f2' of the second lens, the radius of curvature R4 'of the second side of the second lens, and the air spacing T12' between the first element group and the second element group on the first optical axis may satisfy: -20.0< ep12 '/(f 2'/R4'×t12') <0.

According to an exemplary embodiment of the present application, the third spacer element is located at the second side of the third lens and is at least partially in contact with the second side of the third lens, a radius of curvature R4 'of the second side of the second lens, a radius of curvature R5' of the first side of the third lens, a distance EP23 'of the second side of the second spacer element to the first side of the third spacer element in the first optical axis direction, a center thickness CT2' of the second lens on the first optical axis, a center thickness CT3 'of the third lens on the first optical axis, and an abbe number V2' of the second lens may satisfy: r4'+R5' |/[ (EP 23'+CT2' +CT3 '). Times.V 2' ] <10.0.

According to an exemplary embodiment of the present application, the effective focal length f1' of the first lens, the maximum thickness CP1' of the first spacing element along the first optical axis direction, and the air spacing T12' of the first element group and the second element group on the first optical axis may satisfy: 3.0< f1 '/(CP 1' -T12 ') <7.0.

According to an exemplary embodiment of the present application, the radius of curvature R6 'of the second side of the third lens, the radius of curvature R7' of the first side of the fourth lens, the outer diameter D3s 'of the first side of the third spacing element and the inner diameter D3s' of the first side of the third spacing element may satisfy: -5.0< (R6 '-R7')/D3 s '+ (R6' +r7 ')/D3 s' <0.

According to an exemplary embodiment of the present application, a maximum height L ' of the first lens barrel in the first optical axis direction, an effective focal length f ' of the first optical system, and a distance EP01' between an end surface of the first lens barrel closest to the first side and a first side surface of the first spacer element in the first optical axis direction may satisfy: 1.0< (L ' -f ')/EP 01' <3.0.

According to an exemplary embodiment of the present application, the refractive index NR of the reflective polarizing element, the refractive index NQ1 of the first quarter wave plate, the refractive index N1 'of the first lens, the center thickness CT1' of the first lens on the first optical axis, the distance EP01 'between the end surface closest to the first side of the first barrel and the first side surface of the first spacer element along the first optical axis direction and the maximum thickness CP1' of the first spacer element along the first optical axis direction may satisfy: 6.0< (NR+NQ1). Times.CT 1'/EP01' +N1 '. Times.CT 1'/CP1' <8.0.

According to an exemplary embodiment of the present application, a radius of curvature R6' of the second side of the third lens, an inner diameter d2s ' of the first side of the second spacer element, a refractive index N2' of the second lens, a refractive index N3' of the third lens, a refractive index NQ2 of the second quarter wave plate, and a distance EP23' between the second side of the second spacer element and the first side of the third spacer element in the first optical axis direction may satisfy: 15.0< (R6 ' -d2s ')/(N2 ' +N3' +NQ2). Times.EP 23' ] is less than or equal to-5.0.

According to an exemplary embodiment of the present application, the first positioning element is located at the image side of the first lens and is at least partially in contact with the image side of the first lens, and the radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens and the inner diameter d1s of the object side of the first positioning element may satisfy: r < 2 > +R3 >/(d 0s-d1 s) <10.0.

According to an exemplary embodiment of the present application, the first positioning element is located on and at least partially in contact with the image side of the first lens; the second positioning element is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the inner diameter d1s of the object side surface of the first positioning element and the inner diameter d2s of the object side surface of the second positioning element may satisfy: -5.0< (f1+f2) × (N1-N2)/(d 1s-d2 s) <0.

According to an exemplary embodiment of the present application, the distance EP12 between the image side surface of the first positioning element and the object side surface of the second positioning element along the second optical axis direction, among the abbe number V1 of the first lens, the abbe number V2 of the second lens, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R4 of the image side surface of the second lens, and the object side surface of the first positioning element, may satisfy: -50.0< (V1-V2) × (R1-R4)/EP 12< -20.0.

According to an exemplary embodiment of the present application, a distance EP12 from the image side surface of the first positioning element to the object side surface of the second positioning element along the second optical axis direction, a distance EP23 from the image side surface of the second positioning element to the object side surface of the third positioning element along the second optical axis direction, an air interval T23 between the second lens and the third lens on the second optical axis and an effective focal length f2 of the second lens may satisfy: -2.0< (EP 12-EP23+ T23)/f 2<0.

According to an exemplary embodiment of the present application, the radius of curvature R1 of the object side surface of the first lens, the outer diameter D1s of the object side surface of the first positioning element, the outer diameter D2s of the object side surface of the second positioning element, and the radius of curvature R3 of the object side surface of the second lens may satisfy: 0< R1/(D1 s-D2 s) -R3/(D1 s+D2 s) <5.0.

According to an exemplary embodiment of the present application, the combined focal length f45 of the fourth lens and the fifth lens, the outer diameter D3m of the image side surface of the third positioning element, the inner diameter D3m of the image side surface of the third positioning element, the refractive index N4 of the fourth lens and the refractive index N5 of the fifth lens may satisfy: 0< f45/[ (D3 m-D3 m) × (N4+N5) ] <5.0.

The virtual reality system provided by the application is configured into a structural form of a combination of a first optical system and a second optical system, wherein the first optical system can be arranged in, for example, and can be used for transmitting an image of a screen to human eyes so as to provide virtual immersion for consumers; the second optical system may be responsible for collecting position data of the handle etc., and transmits the position data to the screen of the first optical system through the chip, so as to help the user judge the position of both hands in the screen. The virtual immersion sense of the first optical system is combined with the positioning function of the second optical system, so that the space limitation of virtual reality can be broken through, and the interaction between the real world and the virtual world of the virtual device can be realized. The second optical system comprises five lenses, so that a smaller focal length can be achieved under a certain effective image plane, a larger field angle is achieved, and the system can be helped to capture the position and the direction of the handle more conveniently. By controlling the maximum angle of view of the first optical system, the second optical system, and the inner diameter of the end face of the barrel thereof closest to the first side and closest to the object side, respectively, to satisfy the condition 1.0< [ tan (FOV/2) ×d0s ]/[ tan (FOV '/2) ×d0s' ] <2.5, it is possible to effectively block the entry of ineffective light outside the maximum angle of view into the optical system to generate flare, control the two optical systems to satisfy the condition, and it is possible to better ensure the imaging quality of the two optical systems.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:

FIG. 1 shows a schematic plan view of a virtual reality system according to this application;

fig. 2 shows a schematic perspective view (front view) of a virtual reality system according to this application;

fig. 3 shows a schematic perspective view (rear view) of a virtual reality system according to this application;

fig. 4 shows a schematic structural view of a first optical system according to a first embodiment of the present application;

fig. 5 shows a schematic structural diagram of a first optical system according to a second embodiment of the present application;

fig. 6 shows a schematic structural view of a first optical system according to a third embodiment of the present application;

fig. 7, 8 and 9 show on-axis chromatic aberration curves, astigmatism curves and distortion curves of the first optical system according to the first, second and third embodiments of the present application, respectively;

fig. 10 shows a schematic structural view of a first optical system according to a fourth embodiment of the present application;

fig. 11 shows a schematic structural view of a first optical system according to a fifth embodiment of the present application;

fig. 12 is a schematic diagram showing the structure of a first optical system according to a sixth embodiment of the present application;

Fig. 13, 14 and 15 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the first optical systems according to the fourth, fifth, and sixth embodiments of the present application, respectively;

fig. 16 shows a schematic structural view of a second optical system according to a seventh embodiment of the present application;

fig. 17 shows a schematic structural diagram of a second optical system according to an eighth embodiment of the present application;

fig. 18, 19 and 20 show an on-axis chromatic aberration curve, an astigmatism curve, and an f- θ distortion curve of the second optical system according to the seventh and eighth embodiments of the present application, respectively;

fig. 21 shows a schematic structural view of a second optical system according to a ninth embodiment of the present application;

fig. 22 shows a schematic structural view of a second optical system according to embodiment ten of the present application;

fig. 23, 24 and 25 show an on-axis chromatic aberration curve, an astigmatism curve, and an f- θ distortion curve of the second optical system according to the ninth and tenth embodiments of the present application, respectively;

fig. 26 shows a schematic configuration diagram of a second optical system according to an eleventh embodiment of the present application;

fig. 27 shows a schematic structural view of a second optical system according to a twelfth embodiment of the present application; and

fig. 28, 29 and 30 show on-axis chromatic aberration curves, astigmatism curves, and f- θ distortion curves of the second optical system according to the eleventh and twelfth embodiments of the present application, respectively.

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.

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 and/or lenses have been slightly exaggerated for convenience of illustration. Specifically, 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 and/or lens surface is convex and the convex location is not defined, then it is meant that the lens and/or lens surface is convex at least in the paraxial region; if the lens and/or lens surface is concave and the concave location is not defined, it is meant that the lens and/or lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side (e.g., the human eye side) is referred to as the first side of the lens, and the surface of each lens closest to the second side (e.g., the display screen side) is referred to as the second side of the lens. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging surface is referred to as the image side of the lens.

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 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 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.

Referring to fig. 1, 2 and 3, a first aspect of the present application provides a virtual reality system that may include at least one first optical system and at least one second optical system. The second optical system is used for imaging a real scene, for example, for capturing pictures in the surrounding environment and limb actions of a user, and the generated real image is transmitted to the first optical system in an electric signal mode, and the first optical system is used for projecting a virtual reality image of an image surface arranged on the second side and the real image. The first optical system and the second optical system are combined, so that virtual reality fusion of the virtual reality system can be realized. The first optical system may be configured as a catadioptric optical system, the number of which may be one or more, and the second optical system may be configured as a transmissive optical system, the number of which may be one or more. In an example, the virtual reality system may include two first optical systems arranged symmetrically. In an example, the virtual reality system further includes a body, the first optical system may be disposed on an inner side of the body, and the second optical system may be disposed on an outer side of the body.

In an exemplary embodiment, the first optical system may include a first barrel and a spacing element group, a first element group, a second element group, a third element group, and a fourth element group accommodated in the first barrel, wherein the first element group to the fourth element group may be sequentially arranged from a first side to a second side along the first optical axis.

In an exemplary embodiment, the first element group may include a first lens, a reflective polarizing element, and a first quarter wave plate. The second element group may include a second lens and a second quarter wave plate. The third element group may include a third lens. The fourth element group may include a fourth lens.

In an exemplary embodiment, the spacer element group may include a first spacer element, a second spacer element, and a third spacer element. Wherein the first spacer element may be located on the second side of the first lens and at least partially in contact with the second side of the first lens; the second spacer element may be located on and at least partially in contact with the second side of the second lens; the third spacer element may be located on the second side of the third lens and at least partially in contact with the second side of the third lens. The reasonable use of the spacing element can effectively avoid the stray light risk, reduce the interference to the image quality, and can be beneficial to the assembly stability, thereby being beneficial to improving the imaging quality of the optical system.

In an exemplary embodiment, the first side may be a human eye side and the second side may be a display screen side. Accordingly, the first side of each optical element may be referred to as the near-eye side and the second side may be referred to as the near-screen side.

In an exemplary embodiment, the first optical system may further include a partially reflective layer, which may be attached to the second side of the first lens, for example. The partially reflective layer has a transflective effect on light. By providing a partially reflective layer on the second side of the first lens, for example, and combining the reflective polarizing element and the quarter wave plate, the light can be refracted multiple times, effectively reducing the body length of the first optical system.

In an exemplary embodiment, the first optical system may further comprise a diaphragm, which may be arranged, for example, between the first side and the first element group. Image light from the second side, such as a display screen, may be finally projected to, for example, a user's eyes after being refracted and reflected multiple times by the fourth lens, the third lens, the second quarter-wave plate, the first lens, the first quarter-wave plate, the reflective polarizing element, and the like.

In an exemplary embodiment, a display screen is disposed on the image surface of the second side of the first optical system. The image light from the display screen can sequentially pass through the fourth lens, the third lens, the second quarter wave plate, the first lens and the first quarter wave plate to reach the reflective polarizing element, and then be reflected at the reflective polarizing element to form first reflected image light. The first reflected image light passes through the first quarter wave plate, the first lens and reaches the partial reflecting layer in turn, and then is reflected at the partial reflecting layer to form second reflected image light. The second reflected image light then passes through the first lens, the first quarter wave plate, the reflective polarizing element to the aperture in that order and finally is projected into, for example, the user's eye at the first side. In other examples, the order in which the image light, the first reflected image light, and the second reflected image light pass through the elements may be adjusted as desired. The first optical system provided by the application folds the required optical path on the premise of not influencing the projection quality in a light reflection and refraction combined mode, and the length of the body of the first optical system is effectively shortened.

In an exemplary embodiment, the second optical system may include a second lens barrel and a positioning element group, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens accommodated in the second lens barrel, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens may be sequentially arranged from an object side to an image side along the second optical axis.

In an exemplary embodiment, the first lens may have a negative optical power. The second lens can have a negative optical power. The third lens may have positive optical power. The fourth lens may have positive or negative optical power. The fifth lens may have positive or negative optical power. In an exemplary embodiment, the fourth lens and the fifth lens can have optical powers of opposite properties.

In an exemplary embodiment, the fourth lens and the fifth lens may be cemented to form a cemented doublet.

In an exemplary embodiment, the positioning element group may include a first positioning element, a second positioning element, and a third positioning element. Wherein the first positioning element can be positioned at the image side of the first lens and at least partially contacted with the image side of the first lens; the second positioning element can be positioned on the image side of the second lens and at least partially contacted with the image side of the second lens; the third positioning element may be located on and at least partially in contact with the image side of the third lens. The reasonable use of the positioning element can effectively avoid the stray light risk, reduce the interference to the image quality, and be favorable to the assemblage stability, and then be favorable to promoting the imaging quality of the optical system.

The first optical system in the present application is configured to deliver a virtual image (e.g., including a virtual reality image) such as a display screen on the second side to an eye such as a user on the first side, and may provide a virtual immersion to the consumer. The second optical system is used for imaging a real scene, for example, the second optical system can be used for collecting position data of a handle and the like, the formed real image is transmitted to a display screen of the first optical system through a chip of the second optical system, and the first optical system transmits the real image on the display screen to a user, for example, the user can be helped to judge the positions of both hands of the user in the screen. The virtual immersion of the first optical system is combined with the positioning function of the second optical system, so that the space limitation of virtual reality can be broken through, the interaction between the real world of the virtual device and the virtual world can be realized, a user can watch an image fused by a virtual picture and a real scene, and the visual immersion of the virtual reality system is improved. The second optical system comprises five lenses, so that the condition that a smaller focal length exists under a certain effective image plane and a larger field angle is achieved, and the system can be helped to capture the position and the direction of the handle more conveniently.

In an exemplary embodiment, the maximum field angle FOV of the second optical system, the inner diameter d0s of the end face of the second barrel closest to the object side, the maximum field angle FOV 'of the first optical system, and the inner diameter d0s' of the end face of the first barrel closest to the first side may satisfy: 1.0< [ tan (FOV/2) x d0s ]/[ tan (FOV '/2) x d0s' ] <2.5. By controlling the conditional expression, invalid light outside the maximum field angle can be effectively blocked from entering the optical system to generate parasitic light, and the two optical systems are controlled to meet the conditional expression, so that the imaging quality of the two optical systems can be better ensured.

The virtual reality system according to an exemplary embodiment of the present application may be configured in a structure form in which a first optical system, which may be disposed, for example, inside, may be responsible for delivering an image of a screen to a human eye to give a virtual immersion feeling to a consumer, and a second optical system; the second optical system may be responsible for collecting position data of the handle etc., and transmits the position data to the screen of the first optical system through the chip, so as to help the user judge the position of both hands in the screen. The virtual immersion sense of the first optical system is combined with the positioning function of the second optical system, so that the space limitation of virtual reality can be broken through, and the interaction between the real world and the virtual world of the virtual device can be realized. The second optical system comprises five lenses, so that the condition that a smaller focal length exists under a certain effective image plane and a larger field angle is achieved, and the system can be helped to capture the position and the direction of the handle more conveniently. By controlling the maximum angle of view of the first optical system, the second optical system, and the inner diameter of the end face of the barrel thereof closest to the first side and closest to the object side, respectively, to satisfy the condition 1.0< [ tan (FOV/2) ×d0s ]/[ tan (FOV '/2) ×d0s' ] <2.5, it is possible to effectively block the entry of ineffective light outside the maximum angle of view into the optical system to generate flare, control the two optical systems to satisfy the condition, and it is possible to better ensure the imaging quality of the two optical systems.

In an exemplary embodiment, an inner diameter d0s 'of an end surface of the first barrel closest to the first side, an inner diameter d0m' of an end surface of the first barrel closest to the second side, an inner diameter d0s of an end surface of the second barrel closest to the object side, and an inner diameter d0m of an end surface of the second barrel closest to the second side may satisfy: 1.0< (d 0s '-d0 m')/(d 0s-d0 m) <4.0. By controlling the conditional expression, the sizes of the first optical system and the second optical system can be controlled, so that the image on the chip of the second optical system is more reasonably distributed to be transferred to the screen of the first optical system, and the ratio is controlled, thereby being beneficial to image conversion between the two optical systems. More specifically, d0s ', d0m', d0s, and d0m may further satisfy 2.0< (d 0s '-d0 m')/(d 0s-d0 m) <3.0.

In an exemplary embodiment, a maximum height L 'of the first barrel in the first optical axis direction, a maximum height L of the second barrel in the second optical axis direction, an effective focal length f' of the first optical system, and an effective focal length f of the second optical system may satisfy: (L '+L)/(f' +f) <3.0. By controlling the conditional expression, the shape of each lens in the optical system is controlled to ensure the refractive-back length of the first optical system, and the screen size is reduced, so that the height of the virtual reality device is compressed.

In an exemplary embodiment, an outer diameter D0s 'of an end surface of the first barrel closest to the first side and a distance TD' of the first to fourth element groups on the first optical axis may satisfy: 2.0< D0s '/TD' <5.0. The outer diameter D0s of the end surface closest to the object side of the second lens barrel and the distance TD between the object side surface of the first lens and the image side surface of the fifth lens on the second optical axis may satisfy: 0< D0s/TD <2.0. By controlling the conditional expression, the optical total length of the two systems can be controlled, the reasonable size of the appearance proportion of the two optical systems is facilitated, the structures of the lens and the lens barrel can be more reasonable, and the miniaturization of the virtual reality device is facilitated.

In an exemplary embodiment, the radius of curvature R2' of the second side surface of the first lens, the radius of curvature R8' of the second side surface of the fourth lens, the maximum height L ' of the first barrel in the first optical axis direction, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R10 of the image side surface of the fifth lens, and the maximum height L of the second barrel in the second optical axis direction may satisfy: -10.0< [ (r2 ' +r8 ')/L ' ]/[ |r1+r10|/L ] < -5.0. By controlling the conditional expression, on one hand, the sensitivity of the lenses or lenses of the first optical system and the second optical system is reduced, the assembly yield is improved, and meanwhile, the uniformity and the processability of the lenses or lenses are ensured; on the other hand, the sizes of the lens or the lens, the lens barrel and the spacing element or the positioning element can be controlled, so that the whole size of the virtual reality device is compressed.

In an exemplary embodiment, a distance EP12 'of the second side of the first spacing element to the first side of the second spacing element in the first optical axis direction, an effective focal length f2' of the second lens, a radius of curvature R4 'of the second side of the second lens, and an air spacing T12' of the first element group and the second element group on the first optical axis may satisfy: -20.0< ep12 '/(f 2'/R4'×t12') <0. By controlling the conditional expression, the thickness of the mechanism radial edge of the second lens is equivalent to the thickness of the effective diameter, the uniformity of the thickness of the whole lens is better, the thickness ratio of the lens is controlled in the optimal molding state, the curvature radius of the second lens is controlled to be beneficial to the reasonable size layout of the whole optical structure, and the assembly stability is ensured.

In an exemplary 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 distance EP23 'between the second side of the second spacer element and the first side of the third spacer element in the first optical axis direction, the center thickness CT2' of the second lens on the first optical axis, the center thickness CT3 'of the third lens on the first optical axis, and the dispersion coefficient V2' of the second lens may satisfy: r4'+R5' |/[ (EP 23'+CT2' +CT3 '). Times.V 2' ] <10.0. By controlling the conditional expression, the sensitivity of the optical system is reduced, and the assembly yield is improved; the thickness ratio of the lens is controlled, so that the lens is molded better, and meanwhile, the spacer is ensured to meet the requirements of supporting the lens and the processability; and is beneficial to improving the imaging quality of the whole optical system and ensuring the assembly stability of the whole optical system.

In an exemplary embodiment, the effective focal length f1' of the first lens, the maximum thickness CP1' of the first spacing element in the first optical axis direction, and the air spacing T12' of the first element group and the second element group on the first optical axis may satisfy: 3.0< f1 '/(CP 1' -T12 ') <7.0. By controlling the conditional expression, on one hand, the shape of the lens can be controlled, so that the first lens can be molded conveniently; on the other hand, the focal power of the two lenses can be controlled, and the aberration of the first optical system can be corrected by reasonably distributing the focal power of the system, so that the imaging quality is improved.

In an exemplary embodiment, the radius of curvature R6 'of the second side of the third lens, the radius of curvature R7' of the first side of the fourth lens, the outer diameter D3s 'of the first side of the third spacing element and the inner diameter D3s' of the first side of the third spacing element may satisfy: -5.0< (R6 '-R7')/D3 s '+ (R6' +r7 ')/D3 s' <0. By controlling the conditional expression, the emergence angle of the light is favorably controlled, and the CRA requirement of the chip is met; and is favorable for blocking redundant light rays and avoiding the occurrence of stray light.

In an exemplary embodiment, a maximum height L ' of the first barrel in the first optical axis direction, an effective focal length f ' of the first optical system, and a distance EP01' between an end surface of the first barrel closest to the first side surface of the first spacer element in the first optical axis direction may satisfy: 1.0< (L ' -f ')/EP 01' <3.0. By controlling the condition, the degradation of the pupil moving image distortion performance during the rotation of the human eye can be improved; and the first lens can be prevented from being scratched by the section of the first lens protruding out of the first side of the lens barrel.

In an exemplary embodiment, the refractive index NR of the reflective polarizing element, the refractive index NQ1 of the first quarter-wave plate, the refractive index N1 'of the first lens, the center thickness CT1' of the first lens on the first optical axis, the distance EP01 'from the end surface closest to the first side of the first barrel to the first side surface of the first spacing element in the first optical axis direction, and the maximum thickness CP1' of the first spacing element in the first optical axis direction may satisfy: 6.0< (NR+NQ1). Times.CT 1'/EP01' +N1 '. Times.CT 1'/CP1' <8.0. By controlling the conditional expression, on one hand, the element in the first optical system can be thicker, which is beneficial to the attachment of the diaphragm, and on the other hand, the effective focal length of the optical system can be reduced; and the reasonable distribution of other lenses of the whole optical system can be ensured, and the stability of the whole optical system is facilitated.

In an exemplary embodiment, a radius of curvature R6' of the second side surface of the third lens, an inner diameter d2s ' of the first side surface of the second spacer element, a refractive index N2' of the second lens, a refractive index N3' of the third lens, a refractive index NQ2 of the second quarter wave plate, and a distance EP23' between the second side surface of the second spacer element to the first side surface of the third spacer element in the first optical axis direction may satisfy: 15.0< (R6 ' -d2s ')/(N2 ' +N3' +NQ2). Times.EP 23' ] is less than or equal to-5.0. By controlling the condition, on one hand, the refractive index of the light of the whole optical system is favorably controlled to smoothly transit to the rear lens and the intensity of the second lens attached with the quarter wave plate is ensured; on the other hand, the effective focal length of the first optical system can be reduced, so that the field angle of the first optical system can be increased.

In an exemplary embodiment, the radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens, and the inner diameter d1s of the object side of the first positioning element may satisfy: r < 2 > +R3 >/(d 0s-d1 s) <10.0. By controlling the conditional expression, the surface types of the two lenses can be restrained, and the uniformity and the processability of the lenses are ensured; the optical system can be favorable for ensuring enough brightness of the field angle of the optical system, blocking redundant light rays to prevent stray light and ensuring the imaging quality of the optical system.

In an exemplary embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the inner diameter d1s of the object side surface of the first positioning element, and the inner diameter d2s of the object side surface of the second positioning element may satisfy: -5.0< (f1+f2) × (N1-N2)/(d 1s-d2 s) <0. By controlling the conditional expression, the trend of light is facilitated, the processability of the lens is ensured, the positioning element and the lens have a certain bearing area, the stability of the optical system is ensured, and meanwhile, the shielding of redundant light is facilitated, so that the generation of parasitic light is prevented.

In an exemplary embodiment, the abbe number V1 of the first lens, the abbe number V2 of the second lens, the radius of curvature R1 of the object side of the first lens, the radius of curvature R4 of the image side of the second lens, and the distance EP12 from the image side of the first positioning element to the object side of the second positioning element along the second optical axis direction may satisfy: -50.0< (V1-V2) × (R1-R4)/EP 12< -20.0. By controlling the conditional expression, the imaging quality of the optical system is improved; the method is favorable for realizing larger refraction of light rays, reducing the diameter of the second lens and ensuring the size of the whole optical system; the edge thickness of the second lens is favorable for ensuring the overall uniformity of the whole lens, and the lens forming is favorable.

In an exemplary embodiment, a distance EP12 from the image side surface of the first positioning element to the object side surface of the second positioning element along the second optical axis direction, a distance EP23 from the image side surface of the second positioning element to the object side surface of the third positioning element along the second optical axis direction, an air space T23 between the second lens and the third lens on the second optical axis, and an effective focal length f2 of the second lens may satisfy: -2.0< (EP 12-EP23+ T23)/f 2<0. By controlling the condition, on one hand, the mechanism diameter thickness of the second lens and the third lens is guaranteed, the lens thickness is more uniform, and the processability is guaranteed; on the other hand, the sensitivity of the optical system can be improved, so that the performance of the whole optical system is obviously improved.

In an exemplary embodiment, the radius of curvature R1 of the object side of the first lens, the outer diameter D1s of the object side of the first positioning element, the outer diameter D2s of the object side of the second positioning element, and the radius of curvature R3 of the object side of the second lens may satisfy: 0< R1/(D1 s-D2 s) -R3/(D1 s+D2 s) <5.0. By controlling the conditional expression, on one hand, the step difference of two adjacent lenses in the optical system is favorably reduced, the structural rationality of the optical system is ensured, the lens structure is more stable, on the other hand, the viewing angle of the optical system is favorably increased, the light is ensured to be incident into the optical system, and the light is favorably transmitted to the chip through reasonable refraction.

In an exemplary embodiment, the combined focal length f45 of the fourth lens and the fifth lens, the outer diameter D3m of the image side surface of the third positioning element, the inner diameter D3m of the image side surface of the third positioning element, the refractive index N4 of the fourth lens, and the refractive index N5 of the fifth lens may satisfy: 0< f45/[ (D3 m-D3 m) × (N4+N5) ] <5.0. By controlling the conditional expression, the aberration generated by the front-end optical element can be balanced, so that the overall aberration is at a reasonable level; the third positioning element can be made to meet the lens support while ensuring the workability of the positioning element.

The virtual reality system according to the above embodiment of the present application is composed of a first optical system and a second optical system, wherein the first optical system may employ a plurality of lenses, for example, four lenses as described above, and the first optical system may further include a spacer element group therein; the second optical system may employ a plurality of lenses, such as the five lenses described above, and may also include a set of positioning elements. By reasonably configuring the structures and parameters of the first optical system and the second optical system, the system performance can be improved, and the imaging quality and visual immersion feeling of the virtual reality system can be improved. The eyepiece (the first optical system) and the positioning lens (the second optical system) are matched together, so that the positioning effect of the handle is enhanced, and the user experience can be greatly improved. The virtual reality system with the configuration has the characteristics of miniaturization, good imaging quality and the like, and can well meet the use requirements of various portable electronic products in projection scenes.

In the embodiment of the present application, at least one of the mirror surfaces of each of the first to fourth lenses in the first optical system may be an aspherical mirror surface. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality. Similarly, at least one of the mirrors of each of the first to fifth lenses in the second optical system may also be an aspherical mirror.

However, those skilled in the art will appreciate that the number of lenses and/or lenses making up an optical system can be varied to achieve the various results and advantages described in this specification without departing from the technical solutions claimed herein.

Specific examples of the first optical system applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

A first optical system according to a first embodiment of the present application is described below with reference to fig. 4.

As shown in fig. 4, the first optical system 100 includes a first barrel P0 'and first, second, third, and fourth element groups accommodated in the first barrel P0' and sequentially arranged from a first side to a second side along a first optical axis. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. The second element group includes a second quarter wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. And, the first optical system 100 further includes a third quarter wave plate QWP3 and an image plane IMG located at the second side of the fourth element group.

In this embodiment, the first optical system 100 further comprises a set of spacer elements. The spacer element group comprises a first spacer element P1', a second spacer element P2' and a third spacer element P3', wherein the first spacer element P1' is located at the second side of the first lens E1 'and is at least partly in contact with the second side of the first lens E1'; the second spacer element P2' is located on the second side of the second lens E2' and is at least partially in contact with the second side of the second lens E2 '; the third spacer element P3' may be located at the second side of the third lens E3' and at least partially contact the second side of the third lens E3'.

In this embodiment, the first side may be the human eye side and the second side may be the display screen (display) side. The first side of each element is referred to as the near-eye side and the second side is referred to as the near-screen side.

In this embodiment, the reflective polarizing element RP has a near-eye side S1 and a near-screen side, the near-screen side of the reflective polarizing element RP is attached to the near-eye side S2 of the first quarter-wave plate QWP1, the near-screen side of the first quarter-wave plate QWP1 is attached to the near-eye side S3 of the first lens E1', and the first lens E1' further has a near-screen side S4. The first element group consisting of the reflective polarizer RP, the first quarter-wave plate QWP1 and the first lens E1' has positive optical power. The second quarter wave plate QWP2 has a near-eye side S5 and a near-screen side, the near-screen side of the second quarter wave plate QWP2 is attached to the near-eye side S6 of the second lens E2', and the second lens E2' also has a near-screen side S7. The second element group consisting of the second quarter wave plate QWP2 and the second lens E2' has negative optical power. The third lens E3' has positive optical power, having a near-human eye side S8 and a near-screen side S9. The fourth lens E4' has positive optical power, having a near-human eye side S10 and a near-screen side S11. The third quarter wave plate QWP3 has a near-human eye side S12 and a near-screen side, and the near-screen side of the third quarter wave plate QWP3 is attachable to the image plane IMG.

In this embodiment, the image plane IMG disposed on the second side of the first optical system 100 may be provided with a display screen, for example. Image light from the display screen sequentially passes through the third quarter-wave plate QWP3, the fourth lens E4', the third lens E3', the second lens E2', the second quarter-wave plate QWP2, the first lens E1', and the first quarter-wave plate QWP1 to reach the near-screen side of the reflective polarizing element RP, where the first reflection occurs. After the light reflected once passes through the first quarter wave plate QWP1 and the first lens E1' to the near-screen side surface S4 of the first lens E1', a second reflection occurs at the near-screen side surface S4 of the first lens E1 '. The light reflected the second time passes through the first lens E1', the first quarter-wave plate QWP1, and the reflective polarizing element RP in this order and finally projects onto a target object (not shown) in the space. For example, the light reflected twice by the first optical system 100 can be finally projected into the eyes of the user. Wherein the near-screen side S4 of the first lens E1' may be provided with a partially reflective layer BS, for example.

Table 1 shows basic parameters of the first optical system of the first embodiment, in which the unit of curvature radius, thickness/distance is millimeter (mm). Image light from a display screen (display) passes through the elements in order from the serial number 20 to the object plane and is finally projected into the human eye.

TABLE 1

In this embodiment, the near-screen side S4 of the first lens E1', the near-screen side S7 of the second lens E2', the near-eye side S8 and the near-screen side S9 of the third lens E3', and the near-eye side S10 and the near-screen side S11 of the fourth lens E4' are all aspheric, and the surface profile x of each aspheric lens 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. Tables 2-1 and 2-2 show the higher order coefficients A that can be used for each of the aspherical mirror surfaces S4, S7-S11 in example one ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ 、A ₂₀ 、A ₂₂ 、A ₂₄ 、A ₂₆ 、A ₂₈ And A ₃₀ 。

TABLE 2-1

Face number/coefficient

A18

A20

A22

A24

A26

A28

A30

S4

-5.4045E-04

-1.7521E-04

0.0000E+00

S7

-4.9533E-03

1.1891E-03

0.0000E+00

S8

-4.8332E-04

9.9544E-03

8.2879E-04

-1.5382E-03

3.3749E-04

-9.2403E-04

3.3040E-04

S9

4.3318E-02

2.4856E-02

-1.3026E-02

-2.4151E-02

-1.0752E-02

1.0956E-02

-7.5977E-04

S10

6.4787E-02

5.7288E-02

-2.7334E-02

-5.8990E-02

-2.2251E-02

5.7454E-02

2.2619E-02

S11

-6.7509E-02

6.3594E-02

-4.4459E-02

3.0919E-02

-3.2881E-02

2.0899E-02

-4.8703E-03

TABLE 2-2

Example two

A first optical system according to a second embodiment of the present application is described below with reference to fig. 5.

As shown in fig. 5, the first optical system 100 includes a first barrel P0', and first to fourth element groups and a spacing element group accommodated in the first barrel P0'. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. The second element group includes a second quarter wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. The spacer element group comprises a first spacer element P1', a second spacer element P2' and a third spacer element P3'. In this embodiment, the first optical system 100 further includes a third quarter wave plate QWP3 and an image plane IMG located on the second side of the fourth element group.

The optical element group of this embodiment has the same structure as that of the first embodiment, that is, the basic parameter table of the first optical system of this embodiment is the same as table 1, and the aspherical coefficient table is the same as tables 2-1 and 2-2. The embodiment differs from the first embodiment in that the first barrel P0 'and the respective spacing elements P1', P2', P3' are different in partial structural dimensions. For example, the parameters of the inner diameter D2s 'of the first side surface of the second spacer, the inner diameter D3s' of the first side surface of the third spacer, the outer diameter D3s 'of the first side surface of the third spacer, the inner diameter D0s' of the end surface closest to the first side of the first barrel, the inner diameter D0m 'of the end surface closest to the second side of the first barrel, the outer diameter D0s' of the end surface closest to the first side of the first barrel, the distance EP01 'of the end surface closest to the first side of the first barrel to the first side surface of the first spacer element in the first optical axis direction, the distance EP12' of the second side surface of the first spacer element to the first side surface of the second spacer element in the first optical axis direction, the distance EP23 'of the second side surface of the second spacer element to the first side surface of the third spacer element in the first optical axis direction, and the maximum height L' of the first spacer element in the first optical axis direction are different.

Example III

A first optical system according to a third embodiment of the present application is described below with reference to fig. 6.

As shown in fig. 6, the first optical system 100 includes a first barrel P0', and first to fourth element groups and a spacing element group accommodated in the first barrel P0'. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. The second element group includes a second quarter wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. The spacer element group comprises a first spacer element P1', a second spacer element P2' and a third spacer element P3'. In this embodiment, the first optical system 100 further includes a third quarter wave plate QWP3 and an image plane IMG located on the second side of the fourth element group.

Table 3 shows some basic parameters of the first lens barrel P0 'and the respective spacer elements P1', P2', P3' of the first to third embodiments, such as D2s ', D3s', D0m ', D0s', EP01', EP12', EP23', L', etc., and the basic parameters listed in table 3 are all in millimeters (mm).

Examples/parameters	d2s'	d3s'	D3s'	d0s'	d0m'	D0s'	EP01'	EP12'	EP23'	L'
											A first part	26.0090	23.6810	32.8760	40.2560	24.7140	43.0560	2.7608	3.5630	2.4690	16.2910
Two (II)	26.0880	23.5180	32.0760	39.4560	24.7140	42.2560	2.4608	3.4730	2.6790	16.7910
											Three kinds of	26.0420	26.4260	30.1820	40.2560	24.7140	43.0560	2.4608	3.0750	2.0450	15.4910

TABLE 3 Table 3

Fig. 7 shows on-axis chromatic aberration curves of the first optical system 100 of the first, second, and third embodiments, which represent the convergence focus deviation of light rays of different wavelengths through the vision system 100. Fig. 8 shows astigmatism curves of the first optical system 100 of the first, second, and third embodiments, which represent meridional image surface curvature and sagittal image surface curvature corresponding to different angles of view. Fig. 9 shows distortion curves of the first optical system 100 of the first, second, and third embodiments, which represent distortion magnitude values corresponding to different angles of view. As can be seen from fig. 7 to 9, the first optical system 100 according to the first, second and third embodiments can achieve good imaging quality.

Example IV

A first optical system according to a fourth embodiment of the present application is described below with reference to fig. 10.

As shown in fig. 10, the first optical system 100 includes a first barrel P0 'and first, second, third, and fourth element groups accommodated in the first barrel P0' and sequentially arranged from a first side to a second side along a first optical axis. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. The second element group includes a second quarter wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. And, the first optical system 100 further includes a third quarter wave plate QWP3 and an image plane IMG located at the second side of the fourth element group.

In this embodiment, the first optical system 100 further comprises a set of spacer elements. The spacer element group comprises a first spacer element P1', a second spacer element P2' and a third spacer element P3', wherein the first spacer element P1' is located at the second side of the first lens E1 'and is at least partly in contact with the second side of the first lens E1'; the second spacer element P2' is located on the second side of the second lens E2' and is at least partially in contact with the second side of the second lens E2 '; the third spacer element P3' may be located at the second side of the third lens E3' and at least partially contact the second side of the third lens E3 '.

Table 4 shows basic parameters of the first optical system of the fourth embodiment, in which the unit of radius of curvature, thickness/distance is millimeter (mm). Image light from a display screen (display) passes through the elements in order from the serial number 20 to the object plane and is finally projected into the human eye.

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TABLE 4 Table 4

In this embodiment, the near-screen side surface S4 of the first lens E1', the near-screen side surface S7 of the second lens E2', the near-eye side surfaces S8 and S9 of the third lens E3', and the near-eye side surface S10 and S11 of the fourth lens E4' are all aspherical surfaces, and each aspherical surface type can be defined by the formula (1) given in the above embodiment one. Tables 5-1 and 5-2 show the higher order coefficients A that can be used for each of the aspherical mirror surfaces S4, S7-S11 in example two ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ 、A ₂₀ 、A ₂₂ 、A ₂₄ 、A ₂₆ 、A ₂₈ And A ₃₀ 。

Face number/coefficient

A4

A6

A8

A10

A12

A14

A16

S4

4.0507E-01

-9.7521E-04

9.8533E-03

-1.0898E-02

2.2359E-03

-1.6931E-03

1.2606E-03

S7

-2.3396E-01

-5.9523E-02

-4.0733E-02

3.0980E-02

-6.2339E-03

6.6225E-03

-4.5979E-03

S8

3.6172E+00

-7.1397E-01

3.5204E-01

-1.6926E-01

6.8579E-02

-4.3574E-02

1.3397E-02

S9

1.4782E+00

-4.4897E-01

1.6446E-01

-7.5305E-02

4.0404E-02

-2.9539E-02

7.6127E-03

S10

-2.8597E+00

8.0379E-01

-3.0951E-01

1.7621E-01

-8.6553E-02

3.1946E-02

7.6151E-03

S11

5.8000E+00

-1.0412E+00

6.5245E-01

-3.7185E-01

2.0424E-01

-1.4671E-01

1.0293E-01

TABLE 5-1

Face number/coefficient

A18

A20

A22

A24

A26

A28

A30

S4

-6.4757E-04

1.6890E-04

0.0000E+00

S7

-2.7775E-03

4.2593E-03

0.0000E+00

S8

-2.5877E-03

6.1901E-03

2.3813E-03

-2.1571E-03

-1.3107E-03

-7.1599E-04

-7.8328E-04

S9

1.7334E-02

3.9287E-03

-4.3169E-03

-2.1883E-03

1.3586E-03

-2.9655E-03

1.3154E-03

S10

-2.1742E-03

1.0169E-02

-1.6729E-02

9.3804E-03

-2.1717E-03

5.0822E-04

-9.1804E-05

S11

-6.2282E-02

5.2324E-02

-4.3757E-02

3.0645E-02

-3.2821E-02

2.2228E-02

-5.1604E-03

TABLE 5-2

Example five

A first optical system according to a fifth embodiment of the present application is described below with reference to fig. 11.

As shown in fig. 11, the first optical system 100 includes a first barrel P0', and first to fourth element groups and a spacing element group accommodated in the first barrel P0'. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. The second element group includes a second quarter wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. The spacer element group comprises a first spacer element P1', a second spacer element P2' and a third spacer element P3'. In this embodiment, the first optical system 100 further includes a third quarter wave plate QWP3 and an image plane IMG located on the second side of the fourth element group.

The optical element group of this embodiment has the same structure as that of the optical element group of the fourth embodiment, that is, the basic parameter table of the first optical system of this embodiment is the same as that of table 4, and the aspherical coefficient table is the same as that of tables 5-1 and 5-2. This embodiment differs from the fourth embodiment in that the first barrel P0 'and the respective spacer elements P1', P2', P3' are different in partial structural dimensions. For example, the parameters of the inner diameter D2s 'of the first side surface of the second spacer, the inner diameter D3s' of the first side surface of the third spacer, the outer diameter D3s 'of the first side surface of the third spacer, the inner diameter D0s' of the end surface closest to the first side of the first barrel, the inner diameter D0m 'of the end surface closest to the second side of the first barrel, the outer diameter D0s' of the end surface closest to the first side of the first barrel, the distance EP01 'of the end surface closest to the first side of the first barrel to the first side surface of the first spacer element in the first optical axis direction, the distance EP12' of the second side surface of the first spacer element to the first side surface of the second spacer element in the first optical axis direction, the distance EP23 'of the second side surface of the second spacer element to the first side surface of the third spacer element in the first optical axis direction, and the maximum height L' of the first spacer element in the first optical axis direction are different.

Example six

A first optical system according to a sixth embodiment of the present application is described below with reference to fig. 12.

As shown in fig. 12, the first optical system 100 includes a first barrel P0', and first to fourth element groups and a spacing element group accommodated in the first barrel P0'. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. The second element group includes a second quarter wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. The spacer element group comprises a first spacer element P1', a second spacer element P2' and a third spacer element P3'. In this embodiment, the first optical system 100 further includes a third quarter wave plate QWP3 and an image plane IMG located on the second side of the fourth element group.

Table 6 shows some basic parameters of the first lens barrel P0 'and the respective spacer elements P1', P2', P3' of the fourth to sixth embodiments, such as D2s ', D3s', D0m ', D0s', EP01', EP12', EP23', L', etc., and the basic parameters listed in table 6 are all in millimeters (mm).

Examples/parameters	d2s'	d3s'	D3s'	d0s'	d0m'	D0s'	EP01'	EP12'	EP23'	L'
											Fourth, fourth	27.8450	23.0470	32.0000	36.6850	23.9490	36.6850	2.5908	1.3610	1.8090	14.7530
Five kinds of	27.8450	22.6470	31.6000	36.2850	23.9490	39.0860	2.7908	1.1880	2.2740	15.3150
											Six kinds of	27.8740	25.8080	29.2200	37.2850	23.9490	38.6860	2.8908	1.5880	1.6790	15.2150

TABLE 6

Fig. 13 shows on-axis chromatic aberration curves of the first optical system 100 of the fourth, fifth, and sixth embodiments, which represent the convergence focus deviation of light rays of different wavelengths through the vision system 100. Fig. 14 shows astigmatism curves of the first optical system 100 of the fourth, fifth, and sixth embodiments, which represent meridional image surface curvature and sagittal image surface curvature corresponding to different angles of view. Fig. 15 shows distortion curves of the first optical system 100 of the fourth, fifth, and sixth embodiments, which represent distortion magnitude values corresponding to different angles of view. As can be seen from fig. 13 to 15, the first optical system 100 according to the fourth, fifth and sixth embodiments can achieve good imaging quality.

Further, in the first to sixth embodiments, the total effective focal length f 'of the first optical system, the effective focal length f1' of the first element group, the effective focal length f2 'of the second element group, the effective focal length f3' of the third lens E3', the effective focal length f4' of the fourth lens E4', and the maximum field angle FOV' of the first optical system are shown in table 7.

Parameters/embodiments	A first part	Two (II)	Three kinds of	Fourth, fourth	Five kinds of	Six kinds of
							f'(mm)	11.25	11.25	11.25	11.16	11.16	11.16
f1'(mm)	12.35	12.35	12.35	12.47	12.47	12.47
							f2'(mm)	-193.70	-193.70	-193.70	-1788.64	-1788.64	-1788.64
f3'(mm)	71.23	71.23	71.23	154.30	154.30	154.30
							f4'(mm)	17.79	17.79	17.79	16.49	16.49	16.49
FOV'(°)	110.0	110.0	110.0	100.0	100.0	100.0

TABLE 7

Specific examples of the second optical system applicable to the above-described embodiments are further described below with reference to the drawings.

Example seven

A second optical system according to a seventh embodiment of the present application is described below with reference to fig. 16.

As shown in fig. 16, the second optical system 200 includes a second lens barrel P0, and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5, which are sequentially arranged from an object side to an image side along a second optical axis, and are accommodated in the second lens barrel P0. Wherein the fourth lens E4 and the fifth lens E5 are glued to form a double-glued lens.

In this embodiment, the second optical system 200 further includes a positioning element group including a first positioning element P1, a second positioning element P2, and a third positioning element P3. Wherein the first positioning element P1 is located at the image side of the first lens E1 and is at least partially contacted with the image side of the first lens E1; the second positioning element P2 is located at the image side of the second lens E2 and at least partially contacts the image side of the second lens E2; the third positioning element P3 is located at the image side of the third lens E3 and at least partially contacts the image side of the third lens E3.

In this embodiment, the first lens element E1 has a negative refractive power, the object-side surface S1 thereof is convex, and the image-side surface S2 thereof is concave. The second lens element E2 has a negative refractive power, and the object-side surface S3 thereof is concave, and the image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein the object-side surface S8 is concave and the image-side surface S9 is convex.

Table 8 shows basic parameters of the second optical system of the seventh embodiment, in which the unit of curvature radius, thickness/distance is millimeter (mm).

TABLE 8

In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the fifth lens E5 are aspheric, and the surface shape x of each aspheric lens 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 near of the aspheric surfaceAxis curvature, 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 9 shows the higher order coefficients A that can be used for each of the aspherical mirrors S3-S9 in example seven ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ And A ₁₆ 。

Face number/coefficient

A4

A6

A8

A10

A12

A14

A16

S3

1.3155E-02

-3.6933E-03

3.4686E-04

0.0000E+00

S4

6.5174E-02

-2.1988E-02

1.1033E-01

0.0000E+00

S5

7.4294E-02

-1.8085E-01

1.9049E+00

-6.9085E+00

1.4141E+01

-1.4612E+01

6.2110E+00

S6

8.7839E-02

-1.3037E-01

1.2584E+00

-2.2938E+00

9.7644E-01

3.1835E+00

-1.0456E+00

S7

4.1361E-02

-3.2929E-01

2.5555E+00

-9.8149E+00

2.1131E+01

-2.3910E+01

1.1126E+01

S8

-1.4142E+00

3.8135E+00

-5.1918E+00

1.2281E+01

-1.8193E+01

1.0674E+01

8.1662E-01

S9

-7.1809E-02

4.9566E-01

-3.1180E-01

8.7678E-01

-2.7390E+00

3.9152E+00

-1.9157E+00

TABLE 9

Example eight

The second optical system according to the eighth embodiment of the present application is described below with reference to fig. 17.

As shown in fig. 17, the second optical system 200 includes a second lens barrel P0, and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5, which are accommodated in the second lens barrel P0 and sequentially arranged from an object side to an image side along a second optical axis. Wherein the fourth lens E4 and the fifth lens E5 are glued to form a double-glued lens. In this embodiment, the second optical system 200 further includes a positioning element group including a first positioning element P1, a second positioning element P2, and a third positioning element P3.

The five-piece lens group of this embodiment has the same structure as the five-piece lens group of embodiment seven, i.e., the basic parameter table of the second optical system of this embodiment is the same as table 8, and the aspherical coefficient table is the same as table 9. The difference between this embodiment and the seventh embodiment is that the second barrel P0, the first positioning element P1, the second positioning element P2, and the third positioning element P3 are different in partial structural dimensions. For example, parameters such as an inner diameter D1s of the object side surface of the first positioning element P1, an outer diameter D1s of the object side surface of the first positioning element P1, an inner diameter D2s of the object side surface of the second positioning element P2, an outer diameter D2s of the object side surface of the second positioning element P2, an inner diameter D3m of the image side surface of the third positioning element P3, an outer diameter D3m of the image side end surface of the second barrel, an inner diameter D0s of the image side end surface of the second barrel, an outer diameter D0s of the object side end surface of the second barrel, a distance EP12 in the second optical axis direction from the image side surface of the first positioning element to the object side surface of the second positioning element, a distance EP23 in the second optical axis direction from the image side surface of the second positioning element to the object side surface of the third positioning element, and a maximum height L in the second optical axis direction of the second barrel P0 are different.

Table 10 shows some basic parameters of the second barrel P0, the first positioning element P1, the second positioning element P2, and the third positioning element P3 of the seventh and eighth embodiments, such as D1s, D2s, D3m, D0s, D0m, D0s, EP12, EP23, and L, etc., and the basic parameters listed in table 10 are all in millimeters (mm).

Examples/parameters	d1s	D1s	d2s	D2s	d3m	D3m	d0s	d0m	D0s	EP12	EP23	L
													Seven pieces of	3.0570	7.1000	2.6230	3.8430	1.8520	2.9560	7.5290	2.0280	8.0680	0.9680	0.3680	5.4610
Eight (eight)	3.0610	6.9000	2.4570	3.7310	1.8790	2.6860	7.3290	2.0280	7.8680	0.9550	0.3460	5.5610

Table 10

Fig. 18 shows on-axis chromatic aberration curves of the second optical system 200 of the seventh and eighth embodiments, which represent the convergent focus deviation of light rays of different wavelengths after passing through the second optical system 200. Fig. 19 shows astigmatism curves of the second optical system 200 of the seventh and eighth embodiments, which represent meridional image surface curvature and sagittal image surface curvature corresponding to different angles of view. Fig. 20 shows f- θ distortion curves of the second optical system 200 of the seventh and eighth embodiments, which represent distortion magnitude values corresponding to different angles of view. As can be seen from fig. 18 to 20, the second optical system 200 given in the seventh embodiment and the eighth embodiment can achieve good imaging quality.

Example nine

A second optical system according to a ninth embodiment of the present application is described below with reference to fig. 21.

As shown in fig. 21, the second optical system 200 includes a second lens barrel P0, and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5, which are accommodated in the second lens barrel P0 and sequentially arranged from an object side to an image side along a second optical axis. Wherein the fourth lens E4 and the fifth lens E5 are glued to form a double-glued lens.

In this embodiment, the first lens element E1 has a negative refractive power, the object-side surface S1 thereof is convex, and the image-side surface S2 thereof is concave. The second lens element E2 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface S9 thereof is convex.

Table 11 shows a basic parameter table of the second optical system of the ninth embodiment, in which the unit of curvature radius, thickness/distance is millimeter (mm).

TABLE 11

In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the fifth lens E5 are aspherical, and each aspherical surface profile can be defined by the formula (1) given in the fourth embodiment. Table 12 shows the higher order coefficients A that can be used for each of the aspherical mirrors S3-S9 in example five ₄ 、A ₆ 、A ₈ And A ₁₀ 。

Face number/coefficient	A4	A6	A8	A10
					S3	3.0393E-02	-9.4980E-03	1.3270E-03	-1.0643E-04
S4	8.7480E-02	3.4807E-02	2.5571E-02	2.6720E-02
					S5	-2.8300E-02	-1.7206E-02	0.0000E+00	0.0000E+00
S6	6.9885E-02	-5.5844E-02	5.1467E-02	-1.8065E-02
					S7	1.3521E-01	-5.7265E-01	5.4439E-01	-3.3193E-01
S8	1.3891E+00	-2.6572E+00	2.1738E+00	-7.2685E-01
					S9	-7.7499E-02	3.9585E-02	-4.6320E-02	2.2691E-02

Table 12

Examples ten

A second optical system according to embodiment ten of the present application is described below with reference to fig. 22.

As shown in fig. 22, the second optical system 200 includes a second lens barrel P0, and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5, which are sequentially arranged from an object side to an image side along a second optical axis, and are accommodated in the second lens barrel P0. Wherein the fourth lens E4 and the fifth lens E5 are glued to form a double-glued lens. In this embodiment, the second optical system 200 further includes a positioning element group including a first positioning element P1, a second positioning element P2, and a third positioning element P3.

The structure of the five-piece lens group of this embodiment is the same as that of the five-piece lens group of embodiment nine, that is, the basic parameter table of the second optical system of this embodiment is the same as table 11, and the aspherical coefficient table is the same as table 12. This embodiment differs from the ninth embodiment in that the second barrel P0, the first positioning element P1, the second positioning element P2, and the third positioning element P3 differ in part of the structural dimensions. For example, parameters such as an inner diameter D1s of the object side surface of the first positioning element P1, an outer diameter D1s of the object side surface of the first positioning element P1, an inner diameter D2s of the object side surface of the second positioning element P2, an outer diameter D2s of the object side surface of the second positioning element P2, an inner diameter D3m of the image side surface of the third positioning element P3, an outer diameter D3m of the image side end surface of the second barrel, an inner diameter D0s of the image side end surface of the second barrel, an outer diameter D0s of the object side end surface of the second barrel, a distance EP12 in the second optical axis direction from the image side surface of the first positioning element to the object side surface of the second positioning element, a distance EP23 in the second optical axis direction from the image side surface of the second positioning element to the object side surface of the third positioning element, and a maximum height L in the second optical axis direction of the second barrel P0 are different.

Table 13 shows some basic parameters of the second barrel P0, the first positioning element P1, the second positioning element P2, and the third positioning element P3 of the ninth and tenth embodiments, such as D1s, D2s, D3m, D0s, D0m, D0s, EP12, EP23, and L, etc., and the basic parameters listed in table 13 are all in millimeters (mm).

Examples/parameters	d1s	D1s	d2s	D2s	d3m	D3m	d0s	d0m	D0s	EP12	EP23	L
													Nine pieces	3.1920	7.5000	2.7250	4.7430	2.5680	3.5560	7.9290	2.4320	8.4680	0.9730	0.5170	6.5730
Ten times	3.1260	7.3000	2.7250	4.5730	2.5680	3.2860	7.7290	2.4320	8.2680	0.9730	0.5470	6.5730

TABLE 13

Fig. 23 shows on-axis chromatic aberration curves of the second optical system 200 of the ninth and tenth embodiments, which represent the convergent focus deviation of light rays of different wavelengths after passing through the second optical system 200. Fig. 24 shows astigmatism curves of the second optical system 200 of the ninth and tenth embodiments, which represent meridional image surface curvature and sagittal image surface curvature corresponding to different angles of view. Fig. 25 shows f- θ distortion curves of the second optical system 200 of the ninth and tenth embodiments, which represent distortion magnitude values corresponding to different angles of view. As can be seen from fig. 23 to 25, the second optical system 200 given in the ninth and tenth embodiments can achieve good imaging quality.

Example eleven

A second optical system according to an eleventh embodiment of the present application is described below with reference to fig. 26.

As shown in fig. 26, the second optical system 200 includes a second lens barrel P0, and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5, which are sequentially arranged from an object side to an image side along a second optical axis, and are accommodated in the second lens barrel P0. Wherein the fourth lens E4 and the fifth lens E5 are glued to form a double-glued lens.

Table 14 shows a basic parameter table of the second optical system of embodiment eleven, in which the unit of curvature radius, thickness/distance is millimeter (mm).

TABLE 14

In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the fifth lens E5 are aspherical, and each aspherical surface profile can be defined by the formula (1) given in the fourth embodiment. Table 15 shows the higher order coefficients A that can be used for each of the aspherical mirrors S3-S9 in example eleven ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ And A ₁₆ 。

Face number/coefficient

A4

A6

A8

A10

A12

A14

A16

S3

9.1872E-03

-2.1182E-03

2.2639E-04

0.0000E+00

S4

7.0950E-02

1.7984E-02

3.5413E-02

0.0000E+00

S5

1.7310E-01

-2.5361E-01

1.2545E+00

-3.4180E+00

5.3508E+00

-4.2483E+00

1.3739E+00

S6

-1.5233E-01

9.3159E-01

-2.2086E+00

3.3356E+00

-2.9783E+00

1.8414E+00

-5.5596E-01

S7

-4.0417E-01

1.2826E+00

-3.8607E+00

7.1462E+00

-8.2517E+00

5.3062E+00

-1.4945E+00

S8

-1.6284E+00

3.8855E+00

-3.6065E+00

3.6282E+00

-2.6240E+00

-6.8892E-01

1.8222E+00

S9

-1.2596E-01

6.8151E-01

-9.3562E-01

2.1473E+00

-3.9656E+00

4.1616E+00

-1.6772E+00

TABLE 15

Example twelve

A second optical system according to a twelfth embodiment of the present application is described below with reference to fig. 27.

As shown in fig. 27, the second optical system 200 includes a second lens barrel P0, and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5, which are accommodated in the second lens barrel P0 and sequentially arranged from an object side to an image side along a second optical axis. Wherein the fourth lens E4 and the fifth lens E5 are glued to form a double-glued lens. In this embodiment, the second optical system 200 further includes a positioning element group including a first positioning element P1, a second positioning element P2, and a third positioning element P3.

The five-piece lens group of this embodiment has the same structure as the five-piece lens group of embodiment eleven, that is, the basic parameter table of the second optical system of this embodiment is the same as table 14, and the aspherical coefficient table is the same as table 15. This embodiment differs from embodiment eleven in that the second barrel P0, the first positioning element P1, the second positioning element P2, and the third positioning element P3 differ in part of the structural dimensions. For example, parameters such as an inner diameter D1s of the object side surface of the first positioning element P1, an outer diameter D1s of the object side surface of the first positioning element P1, an inner diameter D2s of the object side surface of the second positioning element P2, an outer diameter D2s of the object side surface of the second positioning element P2, an inner diameter D3m of the image side surface of the third positioning element P3, an outer diameter D3m of the image side end surface of the second barrel, an inner diameter D0s of the image side end surface of the second barrel, an outer diameter D0s of the object side end surface of the second barrel, a distance EP12 in the second optical axis direction from the image side surface of the first positioning element to the object side surface of the second positioning element, a distance EP23 in the second optical axis direction from the image side surface of the second positioning element to the object side surface of the third positioning element, and a maximum height L in the second optical axis direction of the second barrel P0 are different.

Table 16 shows some basic parameters of the second barrel P0, the first positioning element P1, the second positioning element P2, and the third positioning element P3 of the eleventh and twelfth embodiments, such as D1s, D2s, D3m, D0s, D0m, D0s, EP12, EP23, and L, etc., and the basic parameters listed in table 16 are all in millimeters (mm).

Examples/parameters	d1s	D1s	d2s	D2s	d3m	D3m	d0s	d0m	D0s	EP12	EP23	L
													Eleven	3.6250	7.3000	2.5120	4.5300	1.8310	3.7000	7.7290	2.0900	8.2680	1.1940	0.5540	6.1530
Twelve pieces	3.6250	7.1000	2.5120	4.3130	1.8310	3.5000	7.5290	2.0900	8.0680	1.1460	0.5980	6.1530

Table 16

Fig. 28 shows on-axis chromatic aberration curves of the second optical system 200 of the eleventh and twelfth embodiments, which represent the convergent focus deviation of light rays of different wavelengths after passing through the second optical system 200. Fig. 29 shows astigmatism curves of the second optical system 200 of the eleventh and twelfth embodiments, which represent meridional image surface curvature and sagittal image surface curvature corresponding to different angles of view. Fig. 30 shows f- θ distortion curves of the second optical system 200 of the eleventh and twelfth embodiments, which represent distortion magnitude values corresponding to different angles of view. As can be seen from fig. 28 to 30, the second optical system 200 given in the eleventh embodiment and the twelfth embodiment can achieve good imaging quality.

Further, in the seventh to twelfth embodiments, the distance TTL on the axis from the object side surface of the first lens E1 of the second optical system to the imaging surface of the second optical system, half of the diagonal length ImgH of the effective pixel area on the imaging surface of the second optical system, the maximum field angle FOV of the second optical system, the aperture value Fno of the second optical system, the total effective focal length f of the second optical system, the effective focal lengths f1 to f5 of each lens of the first lens E1 to the fifth lens E5 in the second optical system, and the combined focal length f45 of the fourth lens E4 and the fifth lens E5 are shown in table 17.

TABLE 17

Referring to fig. 1 to 3, a virtual reality system 10 provided in this application may include a first optical system 100 in any of the above-described first to sixth embodiments and a second optical system 200 in any of the above-described seventh to twelfth embodiments. The above-described embodiments one to six regarding the first optical system 100 and the above-described embodiments seven to twelve regarding the second optical system 200 may be combined in 36 ways, that is, the virtual reality system may have 36 examples. Wherein,

the virtual reality system corresponding to example 1 includes the first optical system of the first embodiment and the second optical system of the seventh embodiment;

the virtual reality system corresponding to example 2 includes the first optical system of the second embodiment and the second optical system of the seventh embodiment;

the virtual reality system corresponding to example 3 includes the first optical system of the third embodiment and the second optical system of the seventh embodiment;

the virtual reality system corresponding to example 4 includes the first optical system of the fourth embodiment and the second optical system of the seventh embodiment;

the virtual reality system corresponding to example 5 includes the first optical system of the fifth embodiment and the second optical system of the seventh embodiment;

The virtual reality system corresponding to example 6 includes the first optical system of the sixth embodiment and the second optical system of the seventh embodiment;

the virtual reality system corresponding to example 7 includes the first optical system of the first embodiment and the second optical system of the eighth embodiment;

the virtual reality system corresponding to example 8 includes the first optical system of the second embodiment and the second optical system of the eighth embodiment;

the virtual reality system corresponding to example 9 includes the first optical system of the third embodiment and the second optical system of the eighth embodiment;

the virtual reality system corresponding to example 10 includes the first optical system of the fourth embodiment and the second optical system of the eighth embodiment;

the virtual reality system corresponding to example 11 includes the first optical system of the fifth embodiment and the second optical system of the eighth embodiment;

the virtual reality system corresponding to example 12 includes a first optical system of embodiment six and a second optical system of embodiment eight;

the virtual reality system corresponding to example 13 includes the first optical system of the first embodiment and the second optical system of the ninth embodiment;

the virtual reality system corresponding to example 14 includes the first optical system of the second embodiment and the second optical system of the ninth embodiment;

The virtual reality system corresponding to example 15 includes the first optical system of the third embodiment and the second optical system of the ninth embodiment;

the virtual reality system corresponding to example 16 includes the first optical system of the fourth embodiment and the second optical system of the ninth embodiment;

the virtual reality system corresponding to example 17 includes the first optical system of the fifth embodiment and the second optical system of the ninth embodiment;

the virtual reality system corresponding to example 18 includes the first optical system of the sixth embodiment and the second optical system of the ninth embodiment;

the virtual reality system corresponding to example 19 includes the first optical system of the first embodiment and the second optical system of the tenth embodiment;

the virtual reality system corresponding to example 20 includes the first optical system of the second embodiment and the second optical system of the tenth embodiment;

the virtual reality system corresponding to example 21 includes the first optical system of the third embodiment and the second optical system of the tenth embodiment;

the virtual reality system corresponding to example 22 includes the first optical system of the fourth embodiment and the second optical system of the tenth embodiment;

the virtual reality system corresponding to example 23 includes the first optical system of embodiment five and the second optical system of embodiment ten;

The virtual reality system corresponding to example 24 includes the first optical system of embodiment six and the second optical system of embodiment ten;

the virtual reality system corresponding to example 25 includes the first optical system of the first embodiment and the second optical system of the eleventh embodiment;

the virtual reality system corresponding to example 26 includes the first optical system of the second embodiment and the second optical system of the eleventh embodiment;

the virtual reality system corresponding to example 27 includes the first optical system of the third embodiment and the second optical system of the eleventh embodiment;

the virtual reality system corresponding to example 28 includes the first optical system of the fourth embodiment and the second optical system of the eleventh embodiment;

the virtual reality system corresponding to example 29 includes the first optical system of embodiment five and the second optical system of embodiment eleventh;

the virtual reality system corresponding to example 30 includes a first optical system of embodiment six and a second optical system of embodiment eleventh;

the virtual reality system corresponding to example 31 includes the first optical system of the first embodiment and the second optical system of the twelfth embodiment;

the virtual reality system corresponding to example 32 includes the first optical system of the second embodiment and the second optical system of the twelfth embodiment;

The virtual reality system corresponding to example 33 includes the first optical system of the third embodiment and the second optical system of the twelfth embodiment;

the virtual reality system corresponding to example 34 includes the first optical system of the fourth embodiment and the second optical system of the twelfth embodiment;

the virtual reality system corresponding to example 35 includes the first optical system of embodiment five and the second optical system of embodiment twelve; and

the virtual reality system corresponding to example 36 includes the first optical system of embodiment six and the second optical system of embodiment twelve.

In summary, each of examples 1 to 36 described above satisfies the conditions shown in tables 18-1, 18-2, 18-3 and 18-4, respectively.

Condition/example	1	2	3	4	5	6	7	8	9
										[tan(FOV/2)×d0s]/[tan(FOV'/2)×d0s']	1.11	1.13	1.11	1.46	1.47	1.43	1.08	1.10	1.08
(d0s'-d0m')/(d0s-d0m)	2.83	2.68	2.83	2.32	2.24	2.42	2.93	2.78	2.93
										(L'+L)/(f'+f)	1.80	1.85	1.74	1.69	1.74	1.73	1.81	1.85	1.75
D0s'/TD'	3.23	3.17	3.23	2.80	2.99	2.96	3.23	3.17	3.23
										D0s/TD	1.44	1.44	1.44	1.44	1.44	1.44	1.40	1.40	1.40
[(R2'+R8')/L']/[\|R1+R10\|/L]	-5.61	-5.44	-5.90	-6.32	-6.09	-6.13	-5.71	-5.54	-6.00
										EP12'/(f2'/R4'×T12')	-18.70	-18.23	-16.14	-7.14	-6.24	-8.34	-18.70	-18.23	-16.14
\|R4'+R5'\|/[(EP23'+CT2'+CT3')×V2']	5.14	5.01	5.42	6.09	5.72	6.20	5.14	5.01	5.42
										f1'/(CP1'-T12')	4.96	4.43	4.43	4.61	4.98	5.92	4.96	4.43	4.43
(R6'-R7')/D3s'+(R6'+R7')/d3s'	-2.29	-2.34	-2.46	-4.61	-4.68	-4.67	-2.29	-2.34	-2.46
										(L'-f')/EP01'	1.83	2.25	1.72	1.39	1.49	1.40	1.83	2.25	1.72
(NR+NQ1)×CT1'/EP01'+N1'×CT1'/CP1'	7.17	7.49	7.49	7.65	7.46	7.75	7.17	7.49	7.49
										(R6'-d2s')/[(N2'+N3'+NQ2)×EP23']	-5.42	-5.00	-6.55	-10.97	-8.72	-11.82	-5.42	-5.00	-6.55
\|R2+R3\|/(d0s-d1s)	5.03	5.03	5.03	5.03	5.03	5.03	5.27	5.27	5.27
										(f1+f2)×(N1-N2)/(d1s-d2s)	-2.70	-2.70	-2.70	-2.70	-2.70	-2.70	-1.94	-1.94	-1.94
(V1-V2)×(R1-R4)/EP12	-27.72	-27.72	-27.72	-27.72	-27.72	-27.72	-28.10	-28.10	-28.10
										(EP12-EP23+T23)/f2	-1.09	-1.09	-1.09	-1.09	-1.09	-1.09	-1.10	-1.10	-1.10
R1/(D1s-D2s)-R3/(D1s+D2s)	3.77	3.77	3.77	3.77	3.77	3.77	3.88	3.88	3.88
										f45/[(D3m-d3m)×(N4+N5)]	0.55	0.55	0.55	0.55	0.55	0.55	0.75	0.75	0.75

TABLE 18-1

TABLE 18-2

Condition/example	19	20	21	22	23	24	25	26	27
										[tan(FOV/2)×d0s]/[tan(FOV'/2)×d0s']	1.54	1.57	1.54	2.02	2.05	1.99	1.14	1.16	1.14
(d0s'-d0m')/(d0s-d0m)	2.93	2.78	2.93	2.40	2.33	2.52	2.76	2.61	2.76
										(L'+L)/(f'+f)	1.88	1.93	1.82	1.77	1.82	1.81	1.85	1.89	1.78
D0s'/TD'	3.23	3.17	3.23	2.80	2.99	2.96	3.23	3.17	3.23
										D0s/TD	1.27	1.27	1.27	1.27	1.27	1.27	1.36	1.36	1.36
[(R2'+R8')/L']/[\|R1+R10\|/L]	-8.41	-8.16	-8.84	-9.48	-9.14	-9.20	-6.50	-6.31	-6.84
										EP12'/(f2'/R4'×T12')	-18.70	-18.23	-16.14	-7.14	-6.24	-8.34	-18.70	-18.23	-16.14
\|R4'+R5'\|/[(EP23'+CT2'+CT3')×V2']	5.14	5.01	5.42	6.09	5.72	6.20	5.14	5.01	5.42
										f1'/(CP1'-T12')	4.96	4.43	4.43	4.61	4.98	5.92	4.96	4.43	4.43
(R6'-R7')/D3s'+(R6'+R7')/d3s'	-2.29	-2.34	-2.46	-4.61	-4.68	-4.67	-2.29	-2.34	-2.46
										(L'-f')/EP01'	1.83	2.25	1.72	1.39	1.49	1.40	1.83	2.25	1.72
(NR+NQ1)×CT1'/EP01'+N1'×CT1'/CP1	7.17	7.49	7.49	7.65	7.46	7.75	7.17	7.49	7.49
										(R6'-d2s')/[(N2'+N3'+NQ2)×EP23']	-5.42	-5.00	-6.55	-10.97	-8.72	-11.82	-5.42	-5.00	-6.55
\|R2+R3\|/(d0s-d1s)	7.22	7.22	7.22	7.22	7.22	7.22	3.22	3.22	3.22
										(f1+f2)×(N1-N2)/(d1s-d2s)	-3.40	-3.40	-3.40	-3.40	-3.40	-3.40	-1.33	-1.33	-1.33
(V1-V2)×(R1-R4)/EP12	-42.84	-42.84	-42.84	-42.84	-42.84	-42.84	-26.81	-26.81	-26.81
										(EP12-EP23+T23)/f2	-1.02	-1.02	-1.02	-1.02	-1.02	-1.02	-1.24	-1.24	-1.24
R1/(D1s-D2s)-R3/(D1s+D2s)	0.30	0.30	0.30	0.30	0.30	0.30	3.47	3.47	3.47
										f45/[(D3m-d3m)×(N4+N5)]	4.32	4.32	4.32	4.32	4.32	4.32	0.30	0.30	0.30

TABLE 18-3

TABLE 18-4

Referring to fig. 1 and 2, in an exemplary embodiment, the virtual reality system 10 provided herein may further include, for example, a third optical system 300, a fourth optical system 400, a fifth optical system 500, and a sixth optical system 600. In some embodiments, the third optical system 300 and/or the fourth optical system 400 and/or the fifth optical system 500 and/or the sixth optical system 600 may be, for example, the second optical system 200.

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 will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but also covers other technical solutions which may be formed by any combination of the features described above or their equivalents without departing from the inventive concept. 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 virtual reality system comprises a first optical system and a second optical system, and is characterized in that,

the first optical system comprises a first lens barrel, a spacing element group accommodated in the first lens barrel, and a first element group, a second element group, a third element group and a fourth element group which are sequentially arranged from a first side to a second side along a first optical axis, wherein the first element group comprises a first lens, a reflective polarizing element and a first quarter wave plate; the second element group comprises a second lens and a second quarter wave plate; the third element group includes a third lens; the fourth element group includes a fourth lens; the set of spacing elements includes a first spacing element, a second spacing element, and a third spacing element;

The second optical system comprises a second lens barrel, a positioning element group accommodated in the second lens barrel, and a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along a second optical axis, wherein the positioning element group comprises a first positioning element, a second positioning element and a third positioning element; and

the first optical system and the second optical system satisfy:

1.0<[tan(FOV/2)×d0s]/[tan(FOV'/2)×d0s']<2.5，

wherein FOV is the maximum angle of view of the second optical system, d0s is the inner diameter of the end face of the second barrel closest to the object side, FOV 'is the maximum angle of view of the first optical system, and d0s' is the inner diameter of the end face of the first barrel closest to the first side.

2. The virtual reality system of claim 1, wherein an inner diameter d0m' of an end face of the first barrel closest to the second side and an inner diameter d0m of an end face of the second barrel closest to the second side satisfy: 1.0< (d 0s '-d0 m')/(d 0s-d0 m) <4.0.

3. The virtual reality system according to claim 1, wherein a maximum height L 'of the first barrel in the first optical axis direction, a maximum height L of the second barrel in the second optical axis direction, an effective focal length f' of the first optical system, and an effective focal length f of the second optical system satisfy: (L '+L)/(f' +f) <3.0.

4. The virtual reality system according to claim 1, wherein an outer diameter D0s 'of an end face of the first barrel closest to the first side and a distance TD' on the first optical axis between a first side face of the first element group and a second side face of the fourth element group satisfy: 2.0< D0s '/TD' <5.0, and

an outer diameter D0s of an end surface of the second lens barrel closest to the object side and a distance TD between the object side surface of the first lens and the image side surface of the fifth lens on the second optical axis satisfy: 0< D0s/TD <2.0.

5. The virtual reality system according to claim 1, wherein a radius of curvature R2' of the second side surface of the first lens, a radius of curvature R8' of the second side surface of the fourth lens, a maximum height L ' of the first barrel in the first optical axis direction, a radius of curvature R1 of the object side surface of the first lens, a radius of curvature R10 of the image side surface of the fifth lens, and a maximum height L of the second barrel in the second optical axis direction satisfy: -10.0< [ (r2 ' +r8 ')/L ' ]/[ |r1+r10|/L ] < -5.0.

6. The virtual reality system of claim 1, wherein the first spacing element is located on and at least partially in contact with a second side of the first lens; the second spacer element is located on the second side of the second lens and is at least partially in contact with the second side of the second lens;

A distance EP12 'of the second side of the first spacing element to the first side of the second spacing element in the first optical axis direction, an effective focal length f2' of the second lens, a radius of curvature R4 'of the second side of the second lens, and an air spacing T12' of the first element group and the second element group on the first optical axis satisfy: -20.0< ep12 '/(f 2'/R4'×t12') <0.

7. The virtual reality system of claim 1, wherein the third spacer element is located on the second side of the third lens and is at least partially in contact with the second side of the third lens,

a radius of curvature R4 'of the second side surface of the second lens, a radius of curvature R5' of the first side surface of the third lens, a distance EP23 'from the second side surface of the second spacer element to the first side surface of the third spacer element in the first optical axis direction, a center thickness CT2' of the second lens on the first optical axis, a center thickness CT3 'of the third lens on the first optical axis, and an abbe number V2' of the second lens satisfy: r4'+R5' |/[ (EP 23'+CT2' +CT3 '). Times.V 2' ] <10.0.

8. The virtual reality system according to any one of claims 1-5, characterized in that an effective focal length f1' of the first lens, a maximum thickness CP1' of the first spacing element in the first optical axis direction, and an air spacing T12' of the first element group and the second element group on the first optical axis satisfy: 3.0< f1 '/(CP 1' -T12 ') <7.0.

9. The virtual reality system of any one of claims 1-5, wherein a radius of curvature R6 'of the second side of the third lens, a radius of curvature R7' of the first side of the fourth lens, an outer diameter D3s 'of the first side of the third spacing element and an inner diameter D3s' of the first side of the third spacing element satisfy: -5.0< (R6 '-R7')/D3 s '+ (R6' +r7 ')/D3 s' <0.

10. The virtual reality system according to any one of claims 1 to 5, characterized in that a maximum height L ' of the first barrel in the first optical axis direction, an effective focal length f ' of the first optical system, and a distance EP01' of an end face of the first barrel closest to the first side to a first side face of the first spacing element in the first optical axis direction satisfy: 1.0< (L ' -f ')/EP 01' <3.0.

11. The virtual reality system according to any one of claims 1 to 5, characterized in that a refractive index NR of the reflective polarizing element, a refractive index NQ1 of the first quarter wave plate, a refractive index N1 'of the first lens, a center thickness CT1' of the first lens on the first optical axis, a distance EP01 'from an end face of the first barrel closest to the first side to a first side face of the first spacing element in the first optical axis direction and a maximum thickness CP1' of the first spacing element in the first optical axis direction satisfy: 6.0< (NR+NQ1). Times.CT 1'/EP01' +N1 '. Times.CT 1'/CP1' <8.0.

12. The virtual reality system of any of claims 1-5, wherein a radius of curvature R6' of the second side of the third lens, an inner diameter d2s ' of the first side of the second spacer element, a refractive index N2' of the second lens, a refractive index N3' of the third lens, a refractive index NQ2 of the second quarter wave plate, and a distance EP23' of the second side of the second spacer element to the first side of the third spacer element in the first optical axis direction satisfy: 15.0< (R6 ' -d2s ')/(N2 ' +N3' +NQ2). Times.EP 23' ] is less than or equal to-5.0.

13. The virtual reality system of any one of claims 1-7, wherein the first positioning element is located on and at least partially in contact with an image side of the first lens,

the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens and the inner diameter d1s of the object side surface of the first positioning element satisfy: r < 2 > +R3 >/(d 0s-d1 s) <10.0.

14. The virtual reality system of any one of claims 1-7, wherein the first positioning element is located on and at least partially in contact with an image side of the first lens; the second positioning element is positioned on the image side of the second lens and at least partially contacts the image side of the second lens;

The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the inner diameter d1s of the object side surface of the first positioning element and the inner diameter d2s of the object side surface of the second positioning element satisfy: -5.0< (f1+f2) × (N1-N2)/(d 1s-d2 s) <0.

15. The virtual reality system of any one of claims 1 to 7, wherein a dispersion coefficient V1 of the first lens, a dispersion coefficient V2 of the second lens, a radius of curvature R1 of an object side surface of the first lens, a radius of curvature R4 of an image side surface of the second lens, and a distance EP12 in the second optical axis direction from the image side surface of the first positioning element to the object side surface of the second positioning element satisfy: -50.0< (V1-V2) × (R1-R4)/EP 12< -20.0.

16. The virtual reality system according to any one of claims 1 to 7, wherein a distance EP12 from an image side surface of the first positioning element to an object side surface of the second positioning element in the second optical axis direction, a distance EP23 from the image side surface of the second positioning element to the object side surface of the third positioning element in the second optical axis direction, an air interval T23 of the second lens and the third lens on the second optical axis, and an effective focal length f2 of the second lens satisfy: -2.0< (EP 12-EP23+ T23)/f 2<0.

17. The virtual reality system of any one of claims 1-7, wherein a radius of curvature R1 of an object side of the first lens, an outer diameter D1s of an object side of the first positioning element, an outer diameter D2s of an object side of the second positioning element, and a radius of curvature R3 of an object side of the second lens satisfy: 0< R1/(D1 s-D2 s) -R3/(D1 s+D2 s) <5.0.

18. The virtual reality system of any one of claims 1-7, wherein a combined focal length f45 of the fourth lens and the fifth lens, an outer diameter D3m of an image side of the third positioning element, an inner diameter D3m of the image side of the third positioning element, a refractive index N4 of the fourth lens, and a refractive index N5 of the fifth lens satisfy: 0< f45/[ (D3 m-D3 m) × (N4+N5) ] <5.0.