CN116880073A

CN116880073A - Virtual reality module

Info

Publication number: CN116880073A
Application number: CN202310979820.9A
Authority: CN
Inventors: 李开荣; 宋立通; 冯梦怡; 游金兴; 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: 2023-10-13

Abstract

The application discloses a virtual reality module, which comprises a visual system and a positioning system, wherein the visual system comprises a first lens barrel, a first lens, a second lens and a third lens which are arranged in the first lens barrel in sequence from a first side to a second side along a first optical axis; the positioning system comprises a second lens barrel, and a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged in the second lens barrel along a second optical axis from an object side to an image side in sequence; the sum F ' of the effective focal lengths of the respective lenses of the first lens to the third lens, the length L ' of the first barrel in the direction of the first optical axis, the sum Σat ' of the air intervals of any adjacent two lenses of the first lens to the third lens in the first optical axis, the sum F of the effective focal lengths of the respective lenses of the first lens to the fifth lens, the length L of the second barrel in the direction of the second optical axis, the sum Σat of the air intervals of any adjacent two lenses of the first lens to the fifth lens in the second optical axis satisfy: 88< |F ' |× (L '/ΣAT ')/(F× (L/ΣAT)) <3510.

Description

Virtual reality module

Technical Field

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

Background

Virtual reality modules typically include two forms of lenses, such as a visual lens and a positioning lens. The visual lens brings the user into the virtual world, the positioning lens acquires the picture of the surrounding environment or captures the pose of the user, and the positioning lens and the visual lens are matched to link the real world with the virtual world, so that the interaction between the real world and the virtual world is realized, and the immersive experience is brought to the user. However, the whole virtual reality module formed by combining multiple lenses is large in size and weight, and comfort and immersive experience of a user are affected.

Disclosure of Invention

The present application provides a virtual reality module 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 module including a vision system and a positioning system, the vision system including a first barrel and an optical element group disposed in the first barrel, the optical element group including a first lens, a second lens, and a third lens in order from a first side to a second side along a first optical axis, the optical element group further including a reflection assembly; the positioning system comprises a second lens cone and five lens groups arranged in the second lens cone, wherein the five lens groups sequentially comprise a first lens, a second lens, a third lens, a fourth lens and a fifth lens from the object side to the image side along a second optical axis; the sum F ' of the effective focal lengths of the respective lenses of the first lens to the third lens, the length L ' of the first barrel in the direction of the first optical axis, the sum Σat ' of the air intervals of any adjacent two lenses of the first lens to the third lens in the first optical axis, the sum F of the effective focal lengths of the respective lenses of the first lens to the fifth lens, the length L of the second barrel in the direction of the second optical axis, the sum Σat of the air intervals of any adjacent two lenses of the first lens to the fifth lens in the second optical axis satisfy: 88< |F ' |× (L '/ΣAT ')/(F× (L/ΣAT)) <3510.

According to an exemplary embodiment of the present application, the visual system further comprises a first spacer disposed on and in contact with the second side surface of the first lens, wherein a radius of curvature R1 'of the first side surface of the first lens, a radius of curvature R2' of the second side surface of the first lens, an inner diameter d1s 'of the first side surface of the first spacer and a spacing EP01' of the first side end surface of the first barrel and the first spacer along the first optical axis satisfy: 8.0< d1s '× (R1'/R2 ')/EP 01' <17.0.

According to an exemplary embodiment of the present application, the visual system further comprises a first spacer disposed on and in contact with the second side of the first lens, the reflection assembly further comprises a reflective polarizing element and a quarter wave plate, wherein a total effective focal length f ' of the visual system, a center thickness drp of the reflective polarizing element on the first optical axis, a center thickness dqwp of the quarter wave plate on the first optical axis, a sum Σct ' of center thicknesses of each of the first to third lenses on the first optical axis, and a spacing EP01' of the first side end surface of the first barrel and the first spacer along the first optical axis satisfy: 1.0< f '/(EP 01' +drp+dqwp+ ΣCT ') <1.5.

According to an exemplary embodiment of the present application, the visual system further comprises a first spacer disposed on and in contact with the second side of the first lens and a second spacer disposed on and in contact with the second side of the second lens, wherein a radius of curvature R2 'of the second side of the first lens, a radius of curvature R3' of the first side of the second lens, an inner diameter d1m 'of the second side of the first spacer and an inner diameter d2s' of the first side of the second spacer satisfy: 0< R2'/d1m' -R3'/d2s' <1.0.

According to an exemplary embodiment of the present application, the effective focal length f1 'of the first lens, the effective focal length f3' of the third lens, and the outer diameter D0s 'of the first side end surface of the first barrel and the outer diameter D0m' of the second side end surface of the first barrel satisfy: 5.0< |f1'+f3' |/(D0 s '+D0m') <128.0.

According to an exemplary embodiment of the present application, the positioning system further includes a first positioning member disposed on and in contact with the image side surface of the first lens, wherein an effective focal length f1 of the first lens, an effective focal length f2 of the second lens, an inner diameter d0s of the object side end surface of the second lens barrel, and an inner diameter d1m of the image side surface of the first positioning member satisfy: -4.0< d0s/f1+d1m/f2< -2.5, wherein f1<0, f2<0.

According to an exemplary embodiment of the present application, the positioning system further includes a first positioning member disposed at and in contact with the image side surface of the first lens and a second positioning member disposed at and in contact with the image side surface of the second lens, wherein a radius of curvature R2 of the image side surface of the first lens, a radius of curvature R4 of the image side surface of the second lens, an inner diameter D1m of the image side surface of the first positioning member, an outer diameter D1m of the image side surface of the first positioning member, an inner diameter D2m of the image side surface of the second positioning member, and an outer diameter D2m of the image side surface of the second positioning member satisfy: 10.0mm ² <R2×(D1m-d1m)+R4×(D2m-d2m)<14.0mm ² 。

According to an exemplary embodiment of the present application, the positioning system further comprises a second positioning member disposed at and in contact with the image side surface of the second lens and a third positioning member disposed at and in contact with the image side surface of the third lens, wherein an effective focal length f2 of the second lens, an effective focal length f3 of the third lens, a center thickness CT2 of the second lens on the second optical axis, a center thickness CT3 of the third lens on the second optical axis, an air interval T23 of the second lens and the third lens on the second optical axis and an interval EP23 of the second positioning member and the third positioning member along the second optical axis satisfy: 0< f3× (T23/CT 3)/|f2× (EP 23/CT 2) | <5.0.

According to an exemplary embodiment of the present application, the positioning system further comprises a first positioning member, a second positioning member and a third positioning member, the first positioning member is disposed on and in contact with the image side surface of the first lens, the second positioning member is disposed on and in contact with the image side surface of the second lens, and the third positioning member is disposed on and in contact with the image side surface of the third lens, wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the spacing EP12 of the first positioning member and the second positioning member along the second optical axis and the spacing EP23 of the second positioning member and the third positioning member along the second optical axis satisfy: 0.5< (f1+f2+f3)/(EP 12+ep 23) <1.3.

According to an exemplary embodiment of the present application, the positioning system further includes a third positioning member disposed on and in contact with the image side surface of the third lens, wherein a radius of curvature R7 of the object side surface of the fourth lens, a radius of curvature R10 of the image side surface of the fifth lens, an inner diameter d3m of the image side surface of the third positioning member, and an inner diameter d0m of the image side end surface of the second lens barrel satisfy: 0< d3m x R7/|d0m x R10| <1.0.

The virtual reality module provided by the application is configured into a structural form of a combination of the visual system and the positioning system, and can restrict the visual angles of the visual system and the positioning system by controlling the sum of the focal lengths of all lenses in the visual system and the sum of the focal lengths of all lenses in the positioning system, so that the visual system and the positioning system meet the characteristic of large visual angles to realize the functional requirements; meanwhile, the length of the first lens cone, the length of the second lens cone and the sum of air intervals of all lenses and/or all lenses on the corresponding optical axis are matched reasonably, the length of a visual system and the length of a positioning system can be shortened on the premise of guaranteeing the processability and the optical performance, the miniaturization of the visual system and the positioning system is realized, the overall machine layout is facilitated, the overall machine weight is reduced, and the comfort and immersive experience of a user in wearing are improved.

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 the drawings:

fig. 1 shows a schematic structural diagram of a virtual reality module according to this application;

FIG. 2 shows a parameter diagram of a visual system according to the present application;

FIG. 3 shows a schematic structural diagram of a visual system according to the present application;

FIG. 4 shows a parameter diagram of a positioning system according to the present application;

FIG. 5 shows a schematic structural view of a positioning system according to the present application;

FIG. 6 shows a schematic diagram of a visual system according to a first embodiment of the application;

FIG. 7 shows a schematic diagram of a visual system according to a second embodiment of the application;

FIG. 8 shows a schematic structural diagram of a vision system in accordance with a third embodiment of the present disclosure;

9A-9C illustrate on-axis chromatic aberration curves, astigmatism curves, and distortion curves, respectively, for a vision system in accordance with embodiments of the present application;

FIG. 10 shows a schematic diagram of a visual system according to a fourth embodiment of the present application;

FIG. 11 shows a schematic diagram of a visual system according to a fifth embodiment of the application;

FIG. 12 is a schematic diagram showing the structure of a visual system according to a sixth embodiment of the present application;

13A-13C illustrate on-axis chromatic aberration curves, astigmatism curves, and distortion curves, respectively, for a visual system according to embodiments four, five, and six of the present application;

FIG. 14 is a schematic diagram showing the structure of a positioning system according to a seventh embodiment of the present application;

FIG. 15 shows a schematic diagram of a positioning system according to an eighth embodiment of the application;

FIG. 16 is a schematic diagram showing the structure of a positioning system according to a ninth embodiment of the present application;

17A-17C illustrate on-axis chromatic aberration curves, astigmatism curves, and distortion curves, respectively, for a positioning system according to embodiments seven, eight, and nine of the present application;

FIG. 18 shows a schematic diagram of a positioning system according to an embodiment of the application;

FIG. 19 is a schematic diagram showing the structure of a positioning system according to an eleventh embodiment of the present application;

FIG. 20 shows a schematic diagram of a positioning system according to a twelfth embodiment of the application; and

fig. 21A to 21C show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of positioning systems according to the tenth, eleventh, and twelfth embodiments of the present application, respectively.

Detailed Description

For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is 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 receiving portion 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 transmitting portion 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 application, use of "may" means "one or more embodiments of the 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, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

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

Referring to fig. 1, a first aspect of the present application provides a virtual reality module that may include a vision system and a positioning system. The positioning system is used for capturing pictures in the surrounding environment or the pose of a user. The visual system dynamically adjusts and projects the virtual image of the transmitting part according to a positioning result obtained from a picture in the surrounding environment or the pose of the user. The number of visual systems may be one or more and the number of positioning systems may be one or more. In one example, the virtual reality module may include two vision systems arranged symmetrically. It should be understood that the virtual reality module provided by the present application may further include any optical system other than a visual system and a positioning system, such as the first optical system.

The positioning system in the application collects the pictures in the surrounding environment or the pose of the user, and the collected pictures in the surrounding environment or the pose of the user can be transmitted to the processing system through the chip of the positioning system. The processing system analyzes the picture in the surrounding environment or the pose of the user, determines information of the needed performance of the visual system according to the analysis result, and then transmits the information of the needed performance of the visual system to the visual system. The visual system dynamically adjusts the virtual image of the transmitting part according to the received information of the required performance, and finally projects the virtual image to the receiving part, such as eyes of a user, so that the user can feel as if the user is in the scene. The virtual reality module provided by the application combines the virtual immersion of the visual system with the positioning function of the positioning system, breaks through the space limitation of the virtual reality device, and realizes the interaction between the real world and the virtual world of the virtual reality device.

In an exemplary embodiment, referring to fig. 2 and 3, the vision system may include a first barrel and an optical element group disposed within the first barrel, the optical element group including a first lens, a second lens, and a third lens sequentially arranged from a first side to a second side along a first optical axis. An air space may be provided between adjacent two lenses of the first to third lenses.

In an exemplary embodiment, referring to fig. 2, the visualization system may include a spacer group disposed within the first barrel, which may include the first spacer and/or the second spacer. Wherein the first spacer may be disposed on and at least partially in contact with the second side of the first lens; the second spacer may be disposed on and at least partially in contact with the second side of the second lens. The spacer is reasonably used, so that the stray light risk can be effectively avoided, the interference to the image quality is reduced, and the imaging quality of a visual system is improved.

In an exemplary embodiment, the optical element group may further include a reflection assembly. The reflection assembly may include a reflection type polarizing element and a quarter wave plate. In other examples, the reflective assembly may further include a partially reflective layer attached to the first side or the second side of the third lens, wherein the partially reflective layer has a transflective effect on light. By arranging the partial reflecting layer on the first side surface or the second side surface of the third lens and combining the reflecting type polarizing element and the quarter wave plate, light rays can be reflected repeatedly, and the length of a body of the visual system is effectively reduced.

In an exemplary embodiment, the reflective polarizing element may be attached to a first side of the first lens and the quarter wave plate may be attached to a second side of the second lens.

In an exemplary embodiment, the second side of the second lens is configured to be planar, and the reflective polarizing element is attached to the quarter-wave plate to form a film layer, and the attached film layer is attached to the second side of the second lens, wherein the reflective polarizing element is closer to the second lens than the quarter-wave plate. The reflective polarizing element and the quarter-wave plate are combined together to form one film layer, so that the number of attached surfaces of the film layer can be reduced, and the attached yield of the film layer can be improved. And the film layer after compounding is attached to the plane, so that the stability of the film layer after attaching is improved, and the performance of a visual system is improved.

In an exemplary embodiment, the first side may be a receiving portion side and the second side may be a transmitting portion side. Accordingly, the first side of each element (first lens, second lens, third lens) may be referred to as a near-receiver side, and the second side may be referred to as a near-emitter side.

In an exemplary embodiment, the visual system may further comprise a stop, which may be arranged, for example, between the first side and the first lens. The image light of the emitting part is refracted and reflected for many times by the third lens, the quarter wave plate, the second lens, the first lens, the reflective polarizing element and the like, and finally is projected to the receiving part.

In an exemplary embodiment, the image light from the emitting part may sequentially pass through the third lens, the quarter-wave plate, the second lens, the first lens, reach the reflective polarizing element, and then be reflected at the reflective polarizing element to form the first reflected image light. The first reflected image light passes through the first lens, the second lens, the quarter wave plate and reaches the partially reflective layer, and then is reflected at the partially reflective layer to form second reflected image light. The second reflected image light sequentially passes through the quarter wave plate, the second lens, the first lens, the reflective polarizing element to the diaphragm and finally is projected to the receiving part. In other examples, the image light from the emission portion may sequentially pass through the third lens, the quarter-wave plate, reach the reflective polarizing element, and then be reflected at the reflective polarizing element to form the first reflected image light. The first reflected image light passes through the quarter wave plate, the third lens and reaches the partially reflective layer, and then is reflected at the partially reflective layer to form second reflected image light. The second reflected image light passes through the third lens, the quarter wave plate, the reflective polarizing element, the second lens, the first lens, the diaphragm and finally is projected to the receiving part. The visual 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, so that the length of the body of the visual system is effectively shortened.

In an exemplary embodiment, referring to fig. 4 and 5, the positioning system may include a second barrel and a five-lens group disposed within the second barrel, the five-lens group including 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. An air space may be provided between adjacent two of the first lens to the fifth lens. In an example, the first lens and the second lens each have negative optical power, and the third lens, the fourth lens, and the fifth lens each have positive optical power.

In an exemplary embodiment, referring to fig. 4, the positioning system may include a positioning member group disposed within the second barrel, and the positioning member group may include one or more of a first positioning member, a second positioning member, and a third positioning member. The first positioning element can be arranged on the image side surface of the first lens and at least partially contacted with the image side surface of the first lens, the second positioning element can be arranged on the image side surface of the second lens and at least partially contacted with the image side surface of the second lens, and the third positioning element can be arranged on the image side surface of the third lens and at least partially contacted with the image side surface of the third lens. The locating piece is reasonably used, the stray light risk can be effectively avoided, the interference to image quality is reduced, and then the imaging quality of a locating system is improved.

In an exemplary embodiment, a sum F ' of effective focal lengths of each of the first to third lenses, a length L ' of the first barrel in a direction in which the first optical axis is located, a sum Σat ' of air intervals of any adjacent two of the first to third lenses in the first optical axis, a sum F of effective focal lengths of each of the first to fifth lenses, a length L of the second barrel in a direction in which the second optical axis is located, a sum Σat of air intervals of any adjacent two of the first to fifth lenses in the second optical axis may satisfy: 88< |F ' |× (L '/ΣAT ')/(F× (L/ΣAT)) <3510. As an example, 2850< |f ' |× (L '/Σat ')/(f× (L/Σat)) <3510. The visual field angles of the visual system and the positioning system can be restrained by controlling the sum of the focal lengths of all lenses in the visual system and the sum of the focal lengths of all lenses in the positioning system, so that the visual system and the positioning system meet the characteristic of large visual field angles to realize the functional requirements; meanwhile, the length of the first lens cone, the length of the second lens cone and the sum of air intervals of all lenses and/or all lenses on the corresponding optical axis are matched reasonably, the length of a visual system and the length of a positioning system can be shortened on the premise of guaranteeing the processability and the optical performance, the miniaturization of the visual system and the positioning system is realized, the overall machine layout is facilitated, the overall machine weight is reduced, and the comfort and immersive experience of a user in wearing are improved.

In an exemplary embodiment, a radius of curvature R1 'of the first side surface of the first lens, a radius of curvature R2' of the second side surface of the first lens, an inner diameter d1s 'of the first side surface of the first spacer, and a spacing EP01' of the first side end surface of the first barrel and the first spacer along the first optical axis may satisfy: 8.0< d1s '× (R1'/R2 ')/EP 01' <17.0. By controlling the radius of curvature of the first side and the second side of the first lens, the optical power of the first lens can be restrained, which is beneficial to correcting imaging aberration; meanwhile, the inner diameter of the first side face of the first spacer and the interval between the first side end face of the first lens barrel and the first spacer along the first optical axis are matched reasonably, and on the premise that the supportability of the first spacer on the first lens is guaranteed, the thickness of the front end of the first lens barrel and the thickness of the non-effective diameter part of the first lens are enabled to be suitable, so that the requirements of forming, processing and assembling of the first lens barrel are met.

In an exemplary embodiment, the total effective focal length f ' of the visual system, the center thickness drp of the reflective polarizing element on the first optical axis, the center thickness dqwp of the quarter-wave plate on the first optical axis, the sum Σct ' of the center thicknesses of the respective lenses of the first to third lenses on the first optical axis, and the interval EP01' of the first side end face of the first barrel and the first spacer along the first optical axis may satisfy: 1.0< f '/(EP 01' +drp+dqwp+ ΣCT ') <1.5. The visual angle of the visual system can be restrained by controlling the total effective focal length of the visual system, so that the visual system meets the characteristic of large visual angle; meanwhile, the length of the body of the visual system can be reduced by matching the reasonable sum of the interval between the first side end surface of the first lens barrel and the first spacer along the first optical axis, the central thickness of the reflective polarizing element on the first optical axis, the central thickness of the quarter wave plate on the first optical axis and the central thickness of each lens of the first lens to the third lens on the first optical axis, and the visual system is beneficial to realizing miniaturization.

In an exemplary embodiment, the radius of curvature R2 'of the second side of the first lens, the radius of curvature R3' of the first side of the second lens, the inner diameter d1m 'of the second side of the first spacer and the inner diameter d2s' of the first side of the second spacer may satisfy: 0< R2'/d1m' -R3'/d2s' <1.0. By controlling the radii of curvature of the second side of the first lens and the first side of the second lens, the optical powers of the first lens and the second lens can be constrained; meanwhile, the inner diameter of the second side face of the first spacer and the inner diameter of the first side face of the second spacer are matched reasonably, redundant light can be blocked on the premise that the supportability of the two spacers for the first lens and the second lens is guaranteed, and the flare problem of a visual system is improved.

In an exemplary embodiment, the effective focal length f1 'of the first lens, the effective focal length f3' of the third lens, the outer diameter D0s 'of the first side end surface of the first barrel, and the outer diameter D0m' of the second side end surface of the first barrel may satisfy: 5.0< |f1'+f3' |/(D0 s '+D0m') <128.0. As an example, 120.0< |f1'+f3' |/(D0 s '+d0m') <128.0. The effective focal lengths of the first lens and the third lens are controlled, so that the trend of light entering and exiting the corresponding lenses is restrained; meanwhile, the outer diameters of the first side end face and the second side end face of the first lens barrel are matched reasonably, and on the premise of ensuring the uniformity of the whole wall thickness and the formability of the first lens barrel, the bearing surfaces between the lenses have reasonable step difference, so that the assembly stability of a visual system is improved.

In an exemplary embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d0s of the object side end surface of the second barrel, and the inner diameter d1m of the image side surface of the first positioning member may satisfy: -4.0< d0s/f1+d1m/f2< -2.5, wherein f1<0, f2<0. The effective focal lengths of the first lens and the second lens are controlled to be negative, so that the visual angle of the positioning system is increased; meanwhile, the inner diameter of the object side end surface of the second lens barrel and the inner diameter of the image side surface of the first positioning piece are matched reasonably, so that the caliber of the second lens barrel can be reduced on the premise of ensuring a large field angle of a positioning system, and the supportability of the first positioning piece on the first lens and the second lens is ensured.

In an exemplary embodiment, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R4 of the image side surface of the second lens, the inner diameter D1m of the image side surface of the first positioner, the outer diameter D1m of the image side surface of the first positioner, the inner diameter D2m of the image side surface of the second positioner, and the outer diameter D2m of the image side surface of the second positioner may satisfy: 10.0mm ² <R2×(D1m-d1m)+R4×(D2m-d2m)<14.0mm ² . By controlling the curvature radius of the image side surfaces of the first lens and the second lens, the surface shapes of the image side surfaces of the first lens and the second lens can be restrained, and uniformity and processability of the two lenses are guaranteed; meanwhile, the inner diameter and the outer diameter of the image side surfaces of the first positioning piece and the second positioning piece are matched reasonably, redundant light can be blocked on the premise that the supportability of the first lens and the second lens by the two positioning pieces is guaranteed, and the parasitic light problem of a positioning system is improved.

In an exemplary embodiment, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the center thickness CT2 of the second lens on the second optical axis, the center thickness CT3 of the third lens on the second optical axis, the air interval T23 of the second lens and the third lens on the second optical axis, and the interval EP23 of the second positioning member and the third positioning member along the second optical axis may satisfy: 0< f3× (T23/CT 3)/|f2× (EP 23/CT 2) | <5.0. By controlling the conditions, the focal power of the second lens and the third lens can be reasonably distributed, which is beneficial to restricting the trend of light rays; meanwhile, the thickness ratio of the second lens and the third lens can be limited, and the forming of the second lens and the third lens is facilitated.

In an exemplary embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the interval EP12 of the first positioning member and the second positioning member along the second optical axis, and the interval EP23 of the second positioning member and the third positioning member along the second optical axis may satisfy: 0.5< (f1+f2+f3)/(EP 12+ep 23) <1.3. The effective focal lengths of the first lens, the second lens and the third lens are reasonably distributed, so that the limitation of the emergence angle of light rays from the third lens is facilitated; meanwhile, reasonable intervals of the first locating piece and the second locating piece along the second optical axis and intervals of the second locating piece and the third locating piece along the second optical axis are matched, and the thicknesses of non-effective diameter parts of the second lens and the third lens are indirectly restrained, so that the processability and the assembly stability of the second lens and the third lens are improved.

In an exemplary embodiment, the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R10 of the image side surface of the fifth lens, the inner diameter d3m of the image side surface of the third positioner, and the inner diameter d0m of the image side end surface of the second barrel may satisfy: 0< d3m x R7/|d0m x R10| <1.0. The curvature radius of the object side surface of the fourth lens and the curvature radius of the image side surface of the fifth lens are controlled, so that the final imaging quality of the positioning system is improved; meanwhile, the inner diameter of the image side surface of the third positioning piece and the inner diameter of the image side end surface of the second lens barrel are matched reasonably, redundant light generated at the front end is shielded, and the imaging quality of the positioning system is improved.

The virtual reality module according to the above embodiment of the application is composed of a visual system and a positioning system, wherein the visual system may employ a plurality of lenses, such as the three lenses described above, and the positioning system may employ a plurality of lenses, such as the five lenses described above. Through reasonable configuration of parameters of the visual system and the positioning system, imaging quality and visual immersion of the virtual reality module can be improved. The virtual reality module 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 an embodiment of the present application, at least one of the surfaces of each of the first to third lenses is an aspherical 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 surfaces of each of the first to fifth lenses is an aspherical surface.

However, those skilled in the art will appreciate that the number of lenses and/or lenses can be varied to achieve the various results and advantages described in the specification without departing from the scope of the application as claimed.

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

Example 1

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

As shown in fig. 6, the vision system 100 includes a first barrel P0 'and an optical element group and a spacer group disposed within the first barrel P0'. The optical element group includes a first lens E1', a second lens E2', and a third lens E3' sequentially arranged from a first side to a second side along the first optical axis. The optical element group further includes a reflection assembly including a reflection type polarizing element RP, a quarter wave plate QWP, and a partially reflective layer BS. The spacer group includes a first spacer P1 'and a second spacer P2'. In the present embodiment, the first side refers to the receiving portion side, and the second side refers to the transmitting portion side. The first side of each element (e.g., the first lens E1', the second lens E2', and the third lens E3 ') is referred to as a near-receiving portion side, and the second side is referred to as a near-emitting portion side.

The first lens E1' has positive optical power, and its near-receiving portion side surface S1 is concave and near-emitting portion side surface S2 is convex. The second lens E2' has negative optical power, and its near-receiving portion side S3 is concave and near-emitting portion side S4 is convex. The third lens E3' has positive optical power, and its near-receiving portion side surface S5 is concave and near-emitting portion side surface S6 is convex. The reflective polarizer RP is attached to the near-receiving-section side surface S1 of the first lens E1'. The quarter wave plate QWP is attached to the near-emission portion side S4 of the second lens E2'. The partially reflective layer BS may be attached to the near-receiving portion side S5 of the third lens E3'.

In this example, after the image light from the emission portion passes through the third lens E3', the quarter-wave plate QWP, the second lens E2', the first lens E1' in this order, and reaches the reflective polarizing element RP, the first reflection occurs at the reflective polarizing element RP. After the light reflected once passes through the first lens E1', the second lens E2', the quarter wave plate QWP and reaches the partially reflective layer BS, a second reflection occurs at the partially reflective layer BS. The light reflected for the second time passes through the quarter wave plate QWP, the second lens E2', the first lens E1', the reflective polarizing element RP, and finally the receiving part in this order. For example, the light reflected twice by the visual system 100 is finally projected to the receiving portion.

Table 1 shows a basic parameter table for the visual system of example one, in which the radius of curvature, thickness/distance are all in millimeters (mm). The image light from the emitting section passes through the elements in the order of number 19 to number 1 and is finally projected into the receiving section.

TABLE 1

In this embodiment, the total effective focal length F ' of the visual system is 27.33mm, the half of the Semi-FOV ' of the maximum field angle of the visual system is 53.0 °, the effective focal length F1' of the first lens E1' is 17586.47mm, the effective focal length F2' of the second lens E2' is 243.09mm, the effective focal length F3' of the third lens E3' is 1186.53mm, and the total effective focal length F ' of each of the first to third lenses is 19016.09mm.

In the present embodiment, the near-receiving side surface S1 and the near-emitting side surface S2 of the first lens E1', the near-receiving side surface S3 and the near-emitting side surface S4 of the second lens E2', and the near-receiving side surface S5 and the near-emitting side surface S6 of the third lens E3' are all 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 paraxial curvature of the aspheric surface, c=1/R '(i.e., paraxial curvature c is the inverse of radius of curvature R' in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 2 shows the cone coefficients k and the higher order coefficients A that can be used for the aspherical surfaces S1 to S6 in example one ₄ 、A ₆ 、A ₈ And A ₁₀ 。

Face number	k	A4	A6	A8	A10
						S1	0.0000	-4.24E-01	1.07E-01	7.32E-03	-2.71E-04
S2	0.0000	1.02E+00	-9.26E-02	-1.94E-02	1.24E-03
						S3	0.0000	1.01E+00	-1.96E-01	1.09E-02	-3.39E-03
S4	0.0000	-7.90E-01	2.88E-02	3.44E-02	8.89E-03
						S5	0.0000	9.22E-03	5.56E-02	8.50E-03	-2.08E-03
S6	0.0000	9.64E-01	-2.74E-01	6.23E-02	5.81E-03

TABLE 2

Example two

A visual system according to a second embodiment of the present application is described below with reference to fig. 7.

As shown in fig. 7, the vision system 100 includes a first barrel P0 'and an optical element group and a spacer group disposed within the first barrel P0'. The optical element group includes a first lens E1', a second lens E2', and a third lens E3' sequentially arranged from a first side to a second side along the first optical axis. The optical element group further includes a reflection assembly including a reflection type polarizing element RP, a quarter wave plate QWP, and a partially reflective layer BS. The spacer group includes a first spacer P1 'and a second spacer P2'.

The optical element group of this example has the same structure as that of the optical element group of the first example, that is, the basic parameter table of the visual system of this example is the same as that of table 1, and the aspherical parameter table is the same as that of table 2. The difference between this embodiment and the first embodiment is that: the first barrel P0', the first spacer P1', and the second spacer P2' are different in structural size. For example, parameters such as a length L ' of the first barrel in the direction of the first optical axis, an inner diameter D1s ' of the first side surface of the first spacer, an inner diameter D1m ' of the second side surface of the first spacer, a spacing EP01' of the first side surface of the first barrel along the first optical axis, an inner diameter D2s ' of the first side surface of the second spacer, an outer diameter D0s ' of the first side surface of the first barrel, an outer diameter D0m ' of the second side surface of the first barrel, and the like are different.

Example III

A visual system according to a third embodiment of the present application is described below with reference to fig. 8.

As shown in fig. 8, the vision system 100 includes a first barrel P0 'and an optical element group and a spacer group disposed within the first barrel P0'. The optical element group includes a first lens E1', a second lens E2', and a third lens E3' sequentially arranged from a first side to a second side along the first optical axis. The optical element group further includes a reflection assembly including a reflection type polarizing element RP, a quarter wave plate QWP, and a partially reflective layer BS. The spacer group includes a first spacer P1 'and a second spacer P2'.

Table 3 shows some basic parameters of the first lens barrel P0', the first spacer P1', the second spacer P2', such as L ', D1s ', D1m ', EP01', D2s ', D0m ', etc. of the first to third embodiments, some of the basic parameters listed in table 3 are measured according to the labeling method shown in fig. 2, and the basic parameters listed in table 3 are all in millimeters (mm).

Examples/parameters	L'	d1s'	d1m'	EP01'	d2s'	D0s'	D0m'
								A first part	17.867	56.487	56.487	6.529	63.261	73.632	76.994
Two (II)	17.647	60.460	61.092	6.529	61.425	72.154	75.397
								Three kinds of	17.628	55.253	55.253	6.578	61.251	75.707	72.997

TABLE 3 Table 3

Fig. 9A shows on-axis chromatic aberration curves for the vision system 100 of the first, second, and third embodiments, which represent the focus offset of light rays of different wavelengths after passing through the vision system 100. Fig. 9B shows astigmatism curves for the vision system 100 of the first, second, and third embodiments, which represent meridional image surface curvature and sagittal image surface curvature for different half angles of view. Fig. 9C shows distortion curves for the first, second, and third embodiments of the vision system 100, which represent distortion magnitude values corresponding to different half angles of view. As can be seen from fig. 9A to 9C, the visual system 100 according to the first, second and third embodiments can achieve good imaging quality.

Example IV

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

As shown in fig. 10, the vision system 100 includes a first barrel P0 'and an optical element group and a spacer group disposed within the first barrel P0'. The optical element group includes a first lens E1', a second lens E2', and a third lens E3' sequentially arranged from a first side to a second side along the first optical axis. The optical element group further includes a reflection assembly including a reflection type polarizing element RP, a quarter wave plate QWP, and a partially reflective layer BS. The spacer group includes a first spacer P1 'and a second spacer P2'. In the present embodiment, the first side refers to the receiving portion side, and the second side refers to the transmitting portion side. The first side of each element (e.g., the first lens E1', the second lens E2', and the third lens E3 ') is referred to as a near-receiving portion side, and the second side is referred to as a near-emitting portion side.

The first lens E1' has negative optical power, and its near-receiving portion side surface S1 is convex and its near-emitting portion side surface S2 is concave. The second lens E2' has positive optical power, and its near-receiving portion side S3 is convex and near-emitting portion side S4 is planar. The third lens E3' has positive optical power, and its near-receiving portion side surface S5 is convex, and its near-emitting portion side surface S6 is convex. The reflective polarizing element RP is attached to the quarter-wave plate QWP to form a film layer, and the attached film layer is attached to the side surface S4 of the near-emitting portion of the second lens E2', wherein the reflective polarizing element RP is closer to the second lens E2' than the quarter-wave plate QWP. The partially reflective layer BS may be attached to the near-emission portion side S6 of the third lens E3'.

In this example, the image light from the emission portion passes through the third lens E3', the quarter-wave plate QWP, and reaches the rear reflection type polarizing element RP, where the first reflection occurs. After the light reflected once passes through the quarter wave plate QWP, the third lens E3', and reaches the partially reflective layer BS, a second reflection occurs at the partially reflective layer BS. The light reflected for the second time passes through the third lens E3', the quarter wave plate QWP, the reflective polarizing element RP, the second lens E2', the first lens E1' in this order, and finally, the receiving part is projected. For example, the light reflected twice by the visual system 100 is finally projected to the receiving portion.

Table 4 shows a basic parameter table for the visual system of example four, where the radius of curvature, thickness/distance units are millimeters (mm). The image light from the emitting section passes through the elements in the order of number 15 to number 1 and is finally projected into the receiving section.

TABLE 4 Table 4

In this embodiment, the total effective focal length F ' of the visual system is 30.62mm, the half of the maximum field angle Semi-FOV ' of the visual system is 53.0 °, the effective focal length F1' of the first lens E1' is-1077.83 mm, the effective focal length F2' of the second lens E2' is 229.74mm, the effective focal length F3' of the third lens E3' is 147.17mm, and the total effective focal length F ' of each of the first to third lenses is-700.92 mm.

In the present embodiment, the near-receiving portion side surface S1 and the near-emitting portion side surface S2 of the first lens E1', the near-receiving portion side surface S3 of the second lens E2', and the near-receiving portion side surface S5 and the near-emitting portion side surface S6 of the third lens E3' are aspherical surfaces. Table 5 shows the cone coefficients k and the higher order coefficients A that can be used for the aspherical surfaces S1-S3, S5-S6 in example four ₄ 、A ₆ 、A ₈ And A ₁₀ 。

Face number	k	A4	A6	A8	A10
						S1	0.0000	1.51E+00	-3.26E-01	5.47E-02	1.99E-04
S2	0.0000	2.40E+00	-6.22E-01	1.38E-01	-1.31E-02
						S3	0.0000	1.21E+00	-4.10E-01	1.06E-01	-1.04E-02
S5	0.0000	-1.01E+00	5.38E-02	5.68E-02	-6.83E-03
						S6	0.0000	1.07E-01	-1.14E-02	1.10E-02	7.21E-04

TABLE 5

Example five

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

As shown in fig. 11, the vision system 100 includes a first barrel P0 'and an optical element group and a spacer group disposed within the first barrel P0'. The optical element group includes a first lens E1', a second lens E2', and a third lens E3' sequentially arranged from a first side to a second side along the first optical axis. The optical element group further includes a reflection assembly including a reflection type polarizing element RP, a quarter wave plate QWP, and a partially reflective layer BS. The spacer group includes a first spacer P1'.

The optical element group of this example has the same structure as that of the optical element group of example four, that is, the basic parameter table of the visual system of this example is the same as that of table 4, and the aspherical coefficient table is the same as that of table 5. The difference between this embodiment and the fourth embodiment is that: the first barrel P0', the first spacer P1' are different in structural size. For example, parameters such as a length L 'of the first barrel in the direction of the first optical axis, an inner diameter D1s' of the first side surface of the first spacer, an inner diameter D1m 'of the second side surface of the first spacer, a spacing EP01' of the first side end surface of the first barrel and the first spacer along the first optical axis, an outer diameter D0s 'of the first side end surface of the first barrel, an outer diameter D0m' of the second side end surface of the first barrel, and the like are different.

Example six

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

As shown in fig. 12, the vision system 100 includes a first barrel P0 'and an optical element group and a spacer group disposed within the first barrel P0'. The optical element group includes a first lens E1', a second lens E2', and a third lens E3' sequentially arranged from a first side to a second side along the first optical axis. The optical element group further includes a reflection assembly including a reflection type polarizing element RP, a quarter wave plate QWP, and a partially reflective layer BS. The spacer group includes a first spacer P1 'and a second spacer P2'.

The optical element group of this example has the same structure as that of the optical element group of example four, that is, the basic parameter table of the visual system of this example is the same as that of table 4, and the aspherical coefficient table is the same as that of table 5. The difference between this embodiment and the fourth embodiment is that: the first barrel P0', the first spacer P1', and the second spacer P2' are different in structural size. For example, parameters such as a length L ' of the first barrel in the direction of the first optical axis, an inner diameter D1s ' of the first side surface of the first spacer, an inner diameter D1m ' of the second side surface of the first spacer, a spacing EP01' of the first side surface of the first barrel along the first optical axis, an inner diameter D2s ' of the first side surface of the second spacer, an outer diameter D0s ' of the first side surface of the first barrel, an outer diameter D0m ' of the second side surface of the first barrel, and the like are different.

Table 6 shows some basic parameters of the first lens barrel P0', the first spacer P1', the second spacer P2', such as L ', D1s ', D1m ', EP01', D2s ', D0m ', etc. of the fourth to sixth embodiments, some of the basic parameters listed in table 6 are measured according to the labeling method shown in fig. 2, and the basic parameters listed in table 6 are all in millimeters (mm).

Examples/parameters	L'	d1s'	d1m'	EP01'	d2s'	D0s'	D0m'
								Fourth, fourth	25.321	67.487	67.487	8.047	76.730	89.598	89.598
Five kinds of	21.048	71.514	71.514	5.543	/	86.169	86.169
								Six kinds of	25.047	67.487	67.487	7.748	76.920	90.557	90.557

TABLE 6

Fig. 13A shows on-axis chromatic aberration curves for the vision system 100 of embodiments four, five, and six, which represent the focus offset of light rays of different wavelengths after passing through the vision system 100. Fig. 13B shows astigmatism curves for the vision system 100 of the fourth, fifth, and sixth embodiments, which represent meridional image surface curvature and sagittal image surface curvature for different half angles of view. Fig. 13C shows distortion curves for the visual system 100 of embodiments four, five, and six, which represent distortion magnitude values corresponding to different half angles of view. As can be seen from fig. 13A to 13C, the visual system 100 according to the fourth, fifth and sixth embodiments can achieve good imaging quality.

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

Example seven

A positioning system according to a seventh embodiment of the present application is described below with reference to fig. 14.

As shown in fig. 14, the positioning system 200 includes a second barrel P0, and a five-piece lens group and a positioning member group disposed within the second barrel P0. The five-lens group includes 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. The stop STO may be disposed between the third lens E3 and the fourth lens E4. The positioning piece group comprises a first positioning piece P1, a second positioning piece P2 and a third positioning piece P3.

The first lens element E1 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an 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 positive refractive power, the object-side surface S9 thereof is concave, and the image-side surface S10 thereof is convex. The filter E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13. Wherein the fourth lens and the fifth lens are cemented to form a cemented lens.

Table 7 shows a basic parameter table of the positioning system of the seventh embodiment, wherein the radius of curvature, thickness/distance are all in millimeters (mm).

TABLE 7

In this embodiment, the total effective focal length F of the positioning system is 0.93mm, the half of the Semi-FOV of the maximum field angle of the positioning system is 83.3 °, and the sum F of the effective focal lengths of the lenses in the first lens to the fifth lens is 13.97mm.

In the present 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 paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 8 shows the higher order coefficients A that can be used for each of the aspherical surfaces S3-S10 in example seven ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ And A ₁₆ 。

Face number

A4

A6

A8

A10

A12

A14

A16

S3

8.3850E-03

-1.8189E-03

1.8292E-04

0.0000E+00

S4

6.4754E-02

1.5443E-02

2.8613E-02

0.0000E+00

S5

1.5799E-01

-2.1779E-01

1.0136E+00

-2.5985E+00

3.8274E+00

-2.8592E+00

8.7003E-01

S6

-1.3903E-01

7.9999E-01

-1.7845E+00

2.5359E+00

-2.1304E+00

1.2393E+00

-3.5206E-01

S7

-3.6888E-01

1.1014E+00

-3.1194E+00

5.4328E+00

-5.9024E+00

3.5712E+00

-9.4638E-01

S8/S9

-1.4862E+00

3.3366E+00

-2.9140E+00

2.7583E+00

-1.8770E+00

-4.6366E-01

1.1539E+00

S10

-1.1496E-01

5.8524E-01

-7.5596E-01

1.6325E+00

-2.8366E+00

2.8009E+00

-1.0621E+00

TABLE 8

Example eight

A positioning system according to an eighth embodiment of the present application is described below with reference to fig. 15.

As shown in fig. 15, the positioning system 200 includes a second barrel P0, and a five-piece lens group and a positioning member group disposed within the second barrel P0. The five-lens group includes 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. The stop STO may be disposed between the third lens E3 and the fourth lens E4. The positioning piece group comprises a first positioning piece P1, a second positioning piece P2 and a third positioning piece P3.

The five-piece lens group of this embodiment has the same structure as the five-piece lens group of the seventh embodiment, i.e., the basic parameter table of the positioning system of this embodiment is the same as table 7, and the aspherical coefficient table is the same as table 8. The difference between this embodiment and the seventh embodiment is that: the second barrel P0, the first positioning member P1, the second positioning member P2, and the third positioning member P3 are different in structural size. For example, the length L of the second barrel in the direction of the second optical axis, the inner diameter D1s of the object side surface of the first positioning member, the inner diameter D1m of the image side surface of the first positioning member, the outer diameter D1m of the image side surface of the first positioning member, the inner diameter D2m of the image side surface of the second positioning member, the outer diameter D2m of the image side surface of the second positioning member, the inner diameter D3m of the image side surface of the third positioning member, the inner diameter D0s of the object side end surface of the second barrel, the inner diameter D0m of the image side end surface of the second barrel, the interval EP12 of the first positioning member and the second positioning member along the second optical axis, the interval EP23 of the second positioning member and the third positioning member along the second optical axis, and the like are different.

Example nine

A positioning system according to a ninth embodiment of the present application is described below with reference to fig. 16.

As shown in fig. 16, the positioning system 200 includes a second barrel P0, and a five-piece lens group and a positioning member group disposed within the second barrel P0. The five-lens group includes 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. The stop STO may be disposed between the third lens E3 and the fourth lens E4. The positioning piece group comprises a first positioning piece P1, a second positioning piece P2 and a third positioning piece P3.

Table 9 shows some basic parameters of the second barrel P0, the first positioning member P1, the second positioning member P2, and the third positioning member P3 of the seventh to ninth embodiments, such as L, D m, D1m, D2m, D3m, D0s, D0m, EP12, EP23, and the like, some of the basic parameters listed in table 9 were measured according to the labeling method shown in fig. 4, and the basic parameters listed in table 9 were all in millimeters (mm).

Examples/parameters	L	d1m	D1m	d2m	D2m	d3m	d0s	d0m	EP12	EP23
											Seven pieces of	5.941	3.452	6.600	1.934	5.155	1.546	7.089	2.305	1.241	1.396
Eight (eight)	5.965	3.568	6.800	1.923	5.591	1.547	7.289	2.182	1.372	1.316
											Nine pieces	5.987	4.022	6.700	1.909	5.672	1.544	7.189	2.182	1.341	1.242

TABLE 9

Fig. 17A shows on-axis chromatic aberration curves for the positioning system 200 of embodiments seven, eight, and nine, which represent the convergent focus deviation of light rays of different wavelengths after passing through the positioning system 200. Fig. 17B shows astigmatic curves of the positioning system 200 of the seventh, eighth, and ninth embodiments, which represent meridional image surface curvature and sagittal image surface curvature corresponding to different half field angles. Fig. 17C shows distortion curves for the positioning system 200 of embodiments seven, eight, and nine, which represent distortion magnitude values corresponding to different half field angles. As can be seen from fig. 17A to 17C, the positioning system 200 according to the seventh, eighth and ninth embodiments can achieve good imaging quality.

Examples ten

A positioning system according to an embodiment of the present application is described below with reference to fig. 18.

As shown in fig. 18, the positioning system 200 includes a second barrel P0, and a five-piece lens group and a positioning member group disposed within the second barrel P0. The five-lens group includes 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. The stop STO may be disposed between the third lens E3 and the fourth lens E4. The positioning piece group comprises a first positioning piece P1, a second positioning piece P2 and a third positioning piece P3.

The first lens element E1 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an 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, the object-side surface S5 thereof is concave, and the image-side surface S6 thereof is convex. 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 concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The filter E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13. Wherein the fourth lens and the fifth lens are cemented to form a cemented lens.

Table 10 shows a basic parameter table for the positioning system of embodiment ten, wherein the radius of curvature, thickness/distance are in millimeters (mm).

Table 10

In this embodiment, the total effective focal length F of the positioning system is 1.09mm, the half of the Semi-FOV of the maximum field angle of the positioning system is 75.0 °, and the sum F of the effective focal lengths of the lenses in the first lens to the fifth lens is 15.38mm.

In the present 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. Table 11 shows the higher order coefficients A that can be used for each of the aspherical surfaces S3-S10 in example ten ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ And A ₁₆ 。

Face number

A4

A6

A8

A10

A12

A14

A16

S3

-1.7850E-01

-4.6370E-01

6.4421E-01

-5.3757E-01

4.3546E-01

-2.7162E-01

6.6334E-02

S4

-2.7775E-01

-4.6998E-01

-2.2883E+00

1.5198E+01

-3.8166E+01

4.6316E+01

-2.2184E+01

S5

5.0505E-02

-1.8609E-01

2.2441E-01

-1.6746E-02

1.5094E-01

-2.4771E-01

1.5694E-01

S6

-9.4530E-02

-3.8530E-02

1.0578E-01

-1.0994E-01

1.5292E-13

-1.2845E-17

3.1087E-19

S7

-8.1366E-02

4.0552E-02

-1.2593E-01

1.2249E-01

-3.9384E-15

-1.6120E-17

-7.2098E-20

S8/S9

4.9887E-01

-1.1483E+00

1.7300E+00

-2.1385E+00

-4.9420E-01

3.6846E+00

-2.7167E+00

S10

-1.0012E-02

6.3384E-02

-2.7212E-01

8.8171E-01

-1.6207E+00

1.5868E+00

-6.0835E-01

TABLE 11

Example eleven

A positioning system according to an eleventh embodiment of the present application is described below with reference to fig. 19.

As shown in fig. 19, the positioning system 200 includes a second barrel P0, and a five-piece lens group and a positioning member group disposed within the second barrel P0. The five-lens group includes 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. The stop STO may be disposed between the third lens E3 and the fourth lens E4. The positioning piece group comprises a first positioning piece P1, a second positioning piece P2 and a third positioning piece P3.

The five-piece lens group of the present embodiment has the same structure as the five-piece lens group of the tenth embodiment, that is, the basic parameter table of the positioning system of the present embodiment is the same as table 10, and the aspherical coefficient table is the same as table 11. The present embodiment differs from the tenth embodiment in that: the second barrel P0, the first positioning member P1, the second positioning member P2, and the third positioning member P3 are different in structural size. For example, the length L of the second barrel in the direction of the second optical axis, the inner diameter D1s of the object side surface of the first positioning member, the inner diameter D1m of the image side surface of the first positioning member, the outer diameter D1m of the image side surface of the first positioning member, the inner diameter D2m of the image side surface of the second positioning member, the outer diameter D2m of the image side surface of the second positioning member, the inner diameter D3m of the image side surface of the third positioning member, the inner diameter D0s of the object side end surface of the second barrel, the inner diameter D0m of the image side end surface of the second barrel, the interval EP12 of the first positioning member and the second positioning member along the second optical axis, the interval EP23 of the second positioning member and the third positioning member along the second optical axis, and the like are different.

Example twelve

A positioning system according to a twelfth embodiment of the present application is described below with reference to fig. 20.

As shown in fig. 20, the positioning system 200 includes a second barrel P0, and a five-piece lens group and a positioning member group disposed within the second barrel P0. The five-lens group includes 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. The stop STO may be disposed between the third lens E3 and the fourth lens E4. The positioning piece group comprises a first positioning piece P1, a second positioning piece P2 and a third positioning piece P3.

Table 12 shows some basic parameters of the second barrel P0, the first positioning member P1, the second positioning member P2, and the third positioning member P3 of the tenth to twelfth embodiments, such as L, D m, D1m, D2m, D3m, D0s, D0m, EP12, EP23, etc., some of the basic parameters listed in table 12 are measured according to the labeling method shown in fig. 4, and the basic parameters listed in table 12 are all in millimeters (mm).

Table 12

Fig. 21A shows on-axis chromatic aberration curves for the positioning system 200 of embodiments ten, eleven, twelve, which represent the convergent focus deviation of light rays of different wavelengths after passing through the positioning system 200. Fig. 21B shows astigmatic curves of the positioning system 200 of embodiments ten, eleven, twelve, representing meridional image surface curvature and sagittal image surface curvature corresponding to different half field angles. Fig. 21C shows distortion curves for the positioning system 200 of embodiments ten, eleven, twelve, representing distortion magnitude values corresponding to different half field angles. As can be seen from fig. 21A to 21C, the positioning system 200 according to the tenth, eleventh and twelfth embodiments can achieve good imaging quality.

Referring to fig. 1, the virtual reality module 10 provided by the present application may include the vision system 100 in any one of the embodiments and the positioning system 200 in any one of the embodiments, and the combination of the vision system and the positioning system may form 36 virtual reality modules, that is, the virtual reality modules have 36 examples. Wherein,,

Example 1: the virtual reality module comprises a positioning system of a seventh embodiment of the visual system of the first embodiment;

example 2: the virtual reality module comprises a visual system of the first embodiment and a positioning system of the eighth embodiment;

example 3: the virtual reality module comprises a visual system of the first embodiment and a positioning system of the ninth embodiment;

example 4: the virtual reality module comprises a visual system of the first embodiment and a positioning system of the tenth embodiment;

example 5: the virtual reality module comprises a visual system of the first embodiment and a positioning system of the eleventh embodiment;

example 6: the virtual reality module comprises a visual system of the first embodiment and a positioning system of the twelfth embodiment;

example 7: the virtual reality module comprises a visual system of the second embodiment and a positioning system of the seventh embodiment;

example 8: the virtual reality module comprises a visual system of the second embodiment and a positioning system of the eighth embodiment;

example 9: the virtual reality module comprises a visual system of the second embodiment and a positioning system of the ninth embodiment;

example 10: the virtual reality module comprises a visual system of the second embodiment and a positioning system of the tenth embodiment;

example 11: the virtual reality module comprises a visual system of the second embodiment and a positioning system of the eleventh embodiment;

Example 12: the virtual reality module comprises a visual system of the second embodiment and a positioning system of the twelfth embodiment;

example 13: the virtual reality module comprises a visual system of the third embodiment and a positioning system of the seventh embodiment;

example 14: the virtual reality module comprises a visual system of the third embodiment and a positioning system of the eighth embodiment;

example 15: the virtual reality module comprises a visual system of the third embodiment and a positioning system of the ninth embodiment;

example 16: the virtual reality module comprises a visual system of the third embodiment and a positioning system of the tenth embodiment;

example 17: the virtual reality module comprises a visual system of the third embodiment and a positioning system of the eleventh embodiment;

example 18: the virtual reality module comprises a visual system of the third embodiment and a positioning system of the twelfth embodiment;

example 19: the virtual reality module comprises a visual system of the fourth embodiment and a positioning system of the seventh embodiment;

example 20: the virtual reality module comprises a visual system of the fourth embodiment and a positioning system of the eighth embodiment;

example 21: the virtual reality module comprises a visual system of the fourth embodiment and a positioning system of the ninth embodiment;

example 22: the virtual reality module comprises a visual system of the fourth embodiment and a positioning system of the tenth embodiment;

Example 23: the virtual reality module comprises a visual system of the fourth embodiment and a positioning system of the eleventh embodiment;

example 24: the virtual reality module comprises a visual system of the fourth embodiment and a positioning system of the twelfth embodiment;

example 25: the virtual reality module comprises a visual system of the fifth embodiment and a positioning system of the seventh embodiment;

example 26: the virtual reality module comprises a visual system of the fifth embodiment and a positioning system of the eighth embodiment;

example 27: the virtual reality module comprises a visual system of the fifth embodiment and a positioning system of the ninth embodiment;

example 28: the virtual reality module comprises a visual system of the fifth embodiment and a positioning system of the tenth embodiment;

example 29: the virtual reality module comprises a visual system of the fifth embodiment and a positioning system of the eleventh embodiment;

example 30: the virtual reality module comprises a visual system of the fifth embodiment and a positioning system of the twelfth embodiment;

example 31: the virtual reality module comprises a visual system of the sixth embodiment and a positioning system of the seventh embodiment;

example 32: the virtual reality module comprises a visual system in the sixth embodiment and a positioning system in the eighth embodiment;

example 33: the virtual reality module comprises a visual system of the sixth embodiment and a positioning system of the ninth embodiment;

Example 34: the virtual reality module comprises a visual system in the sixth embodiment and a positioning system in the tenth embodiment;

example 35: the virtual reality module comprises a visual system in the sixth embodiment and a positioning system in the eleventh embodiment; and

Example 36: the virtual reality module comprises a visual system of the sixth embodiment and a positioning system of the twelfth embodiment.

In summary, table 13 shows the values of the conditional expressions of each of examples 1 to 36.

TABLE 13

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims

1. The virtual reality module comprises a visual system and a positioning system, and is characterized in that,

the visual system comprises a first lens barrel and an optical element group arranged in the first lens barrel, wherein the optical element group comprises a first lens, a second lens and a third lens in sequence from a first side to a second side along a first optical axis, and the optical element group further comprises a reflecting component;

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

a sum F ' of effective focal lengths of each of the first to third lenses, a length L ' of the first barrel in a direction in which the first optical axis is located, a sum Σat ' of air intervals of any adjacent two of the first to third lenses in the first optical axis, a sum F of effective focal lengths of each of the first to fifth lenses, a length L of the second barrel in a direction in which the second optical axis is located, and a sum Σat of air intervals of any adjacent two of the first to fifth lenses in the second optical axis satisfy: 88< |F ' |× (L '/ΣAT ')/(F× (L/ΣAT)) <3510.

2. The virtual reality module of claim 1, wherein the vision system further comprises a first spacer disposed on and in contact with the second side of the first lens,

Wherein, the radius of curvature R1 'of the first side surface of the first lens, the radius of curvature R2' of the second side surface of the first lens, the inner diameter d1s 'of the first side surface of the first spacer, and the interval EP01' between the first side end surface of the first lens barrel and the first spacer along the first optical axis satisfy: 8.0< d1s '× (R1'/R2 ')/EP 01' <17.0.

3. The virtual reality module of claim 1, wherein the vision system further comprises a first spacer disposed on and in contact with the second side of the first lens, the reflective assembly further comprises a reflective polarizing element and a quarter wave plate,

wherein a total effective focal length f ' of the visual system, a center thickness drp of the reflective polarizing element on the first optical axis, a center thickness dqwp of the quarter-wave plate on the first optical axis, a sum Σct ' of center thicknesses of each of the first lens to the third lens on the first optical axis, and a first side end face of the first barrel and a spacing EP01' of the first spacer along the first optical axis satisfy: 1.0< f '/(EP 01' +drp+dqwp+ ΣCT ') <1.5.

4. The virtual reality module of claim 1, wherein the vision system further comprises a first spacer disposed on and in contact with the second side of the first lens and a second spacer disposed on and in contact with the second side of the second lens,

wherein a radius of curvature R2 'of the second side of the first lens, a radius of curvature R3' of the first side of the second lens, an inner diameter d1m 'of the second side of the first spacer and an inner diameter d2s' of the first side of the second spacer satisfy: 0< R2'/d1m' -R3'/d2s' <1.0.

5. The virtual reality module of claim 1, wherein an effective focal length f1 'of the first lens, an effective focal length f3' of the third lens, an outer diameter D0s 'of a first side end surface of the first lens barrel, and an outer diameter D0m' of a second side end surface of the first lens barrel satisfy: 5.0< |f1'+f3' |/(D0 s '+D0m') <128.0.

6. The virtual reality module of any one of claims 1-5, wherein the positioning system further comprises a first positioning member disposed on and in contact with an image side of the first lens,

The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d0s of the object side end surface of the second lens barrel, and the inner diameter d1m of the image side surface of the first positioning element satisfy: -4.0< d0s/f1+d1m/f2< -2.5, wherein f1<0, f2<0.

7. The virtual reality module of any one of claims 1-5, wherein the positioning system further comprises a first positioning member disposed on and in contact with an image side of the first lens and a second positioning member disposed on and in contact with an image side of the second lens,

wherein the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R4 of the image side surface of the second lens, the inner diameter D1m of the image side surface of the first positioning member, the outer diameter D1m of the image side surface of the first positioning member, the inner diameter D2m of the image side surface of the second positioning member and the outer diameter D2m of the image side surface of the second positioning member satisfy: 10.0mm ² <R2×(D1m-d1m)+R4×(D2m-d2m)<14.0mm ² 。

8. The virtual reality module of any one of claims 1-5, wherein the positioning system further comprises a second positioning member disposed on and in contact with an image side of the second lens and a third positioning member disposed on and in contact with an image side of the third lens,

Wherein an effective focal length f2 of the second lens, an effective focal length f3 of the third lens, a center thickness CT2 of the second lens on the second optical axis, a center thickness CT3 of the third lens on the second optical axis, an air interval T23 of the second lens and the third lens on the second optical axis, and an interval EP23 of the second positioning member and the third positioning member along the second optical axis satisfy: 0< f3× (T23/CT 3)/|f2× (EP 23/CT 2) | <5.0.

9. The virtual reality module of any one of claims 1-5, wherein the positioning system further comprises a first positioning member disposed on and in contact with an image side of the first lens, a second positioning member disposed on and in contact with an image side of the second lens, and a third positioning member disposed on and in contact with an image side of the third lens,

the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the interval EP12 between the first positioning member and the second positioning member along the second optical axis, and the interval EP23 between the second positioning member and the third positioning member along the second optical axis satisfy: 0.5< (f1+f2+f3)/(EP 12+ep 23) <1.3.

10. The virtual reality module of any one of claims 1-5, wherein the positioning system further comprises a third positioning member disposed on and in contact with an image side of the third lens,

wherein the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R10 of the image side surface of the fifth lens, the inner diameter d3m of the image side surface of the third positioning member, and the inner diameter d0m of the image side end surface of the second lens barrel satisfy: 0< d3m x R7/|d0m x R10| <1.0.