Virtual reality module

Abstract

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

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical devices, and in particular to a virtual reality module. BACKGROUND

[0002] A virtual reality module usually includes two types of lenses, such as a visual lens and a positioning lens. The visual lens brings the user into a virtual world, and the positioning lens acquires a picture of the surrounding environment or captures the pose of the user. The positioning lens in combination with the visual lens can link the real world and the virtual world, realize the interaction between the real world and the virtual world, and thus bring the user an immersive experience. However, the virtual reality module composed of multiple lenses has a large overall volume and a large weight, which affects the comfort and the immersive experience of the user when wearing. SUMMARY

[0003] The present application provides a virtual reality module that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0004] An aspect of the present application provides a virtual reality module, which includes a visual system and a positioning system. The visual system includes a first lens barrel and an optical element group disposed in the first lens barrel. The optical element group includes, in order from a first side to a second side along a first optical axis, a first lens, a second lens, and a third lens. The optical element group further includes a reflection assembly. The positioning system includes a second lens barrel and a five-piece lens group disposed in the second lens barrel. The five-piece lens group includes, in order from an object side to an image side along a second optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. A sum of effective focal lengths of the first lens to the third lens F', a length of the first lens barrel in a direction of the first optical axis L', a sum of air spacings of any two adjacent lenses among the first lens to the third lens on the first optical axis ∑AT', a sum of effective focal lengths of the first lens to the fifth lens F, a length of the second lens barrel in a direction of the second optical axis L, and a sum of air spacings of any two adjacent lenses among the first lens to the fifth lens on the second optical axis ∑AT satisfy: 88<|F'|×(L' / ∑AT') / (F×(L / ∑AT))<3510.

[0005] According to an example embodiment of the present application, the visual system further includes a first spacer disposed on and in contact with the second side of the first lens. A radius of curvature of the first side of the first lens R1', a radius of curvature of the second side of the first lens R2', an inner diameter of a first side of the first spacer d1s', and a spacing EP01' of 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') / EP01'<17.0.

[0006] According to an example 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 the reflecting assembly further comprises a reflective polarizing element and a quarter wave plate, wherein the total effective focal length f' of the visual system, the central thickness drp of the reflective polarizing element along the first optical axis, the central thickness dqwp of the quarter wave plate along the first optical axis, the sum of the central thicknesses of the first lens to the third lens along the first optical axis ∑CT', and the spacing EP01' of the first side end surface of the first lens barrel and the first spacer along the first optical axis satisfy: 1.0 < f' / (EP01' + drp + dqwp + ∑CT') < 1.5.

[0007] According to an example 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 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 satisfy: 0 < R2' / d1m' - R3' / d2s' < 1.0.

[0008] According to an example embodiment of the present application, 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 lens barrel, and the outer diameter D0m' of the second side end surface of the first lens barrel satisfy: 5.0 < |f1' + f3'| / (D0s' + D0m') < 128.0.

[0009] According to an example embodiment of the present application, the positioning system further comprises a first positioning member disposed on and in contact with the image side of the first lens, wherein 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 of the first positioning member satisfy: -4.0 < d0s / f1 + d1m / f2 < -2.5, wherein f1 < 0 and f2 < 0.

[0010] According to an example embodiment of the present application, the positioning system further comprises a first positioning member disposed on and in contact with the image side of the first lens and a second positioning member disposed on and in contact with the image side of the second lens, wherein the radius of curvature R2 of the image side of the first lens, the radius of curvature R4 of the image side of the second lens, the inner diameter d1m of the image side of the first positioning member, the outer diameter D1m of the image side of the first positioning member, the inner diameter d2m of the image side of the second positioning member, and the outer diameter D2m of the image side of the second positioning member satisfy: 10.0 mm 2< R2 x (D1m - d1m) + R4 x (D2m - d2m) < 14.0 mm 2 .

[0011] According to an exemplary embodiment of the present application, the positioning system further comprises a second positioning member disposed on and in contact with the image side surface of the second lens, and a third positioning member disposed on and in contact with the image side surface of the third lens, wherein 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 separation T23 of the second lens and the third lens on the second optical axis, and the separation EP23 of the second positioning member and the third positioning member along the second optical axis satisfy: 0 < f3 x (T23 / CT3) / |f2 x (EP23 / CT2)| < 5.0.

[0012] According to an exemplary embodiment of the present application, the positioning system further comprises a first positioning member disposed on and in contact with the image side surface of the first lens, a second positioning member disposed on and in contact with the image side surface of the second lens, and a third positioning member 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 separation EP12 of the first positioning member and the second positioning member along the second optical axis, and the separation EP23 of the second positioning member and the third positioning member along the second optical axis satisfy: 0.5 < |(f1 + f2 + f3)| / (EP12 + EP23) < 1.3.

[0013] According to an exemplary embodiment of the present application, the positioning system further comprises a third positioning member disposed on and in contact with the image side surface 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.

[0014] The virtual reality module provided in the application is configured in the form of a structure combined with a visual system and a 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, the field of view angles of the visual system and the positioning system can be constrained, so that the visual system and the positioning system meet the characteristics of a large field of view angle to achieve their functional requirements. At the same time, the sum of the lengths of the first lens barrel and the second lens barrel and the air spacing of all lenses and / or all lenses on the corresponding optical axis is reasonable, which can shorten the length of the visual system and the positioning system under the premise of ensuring the processability and optical performance, realize the miniaturization of the visual system and the positioning system, facilitate the overall layout, reduce the weight of the overall machine, and improve the comfort and immersive experience of the user when wearing. BRIEF DESCRIPTION OF DRAWINGS

[0015] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the drawings. In the drawings:

[0016] Figure 1 A structural schematic diagram of a virtual reality module according to the application is shown;

[0017] Figure 2 A parameter schematic diagram of a visual system according to the application is shown;

[0018] Figure 3 A structural schematic diagram of a visual system according to the application is shown;

[0019] Figure 4 A parameter schematic diagram of a positioning system according to the application is shown;

[0020] Figure 5 A structural schematic diagram of a positioning system according to the application is shown;

[0021] Figure 6 A structural schematic diagram of a visual system according to Embodiment One of the application is shown;

[0022] Figure 7 A structural schematic diagram of a visual system according to Embodiment Two of the application is shown;

[0023] Figure 8 A structural schematic diagram of a visual system according to Embodiment Three of the application is shown;

[0024] Figures 9A to 9C Axial chromatic aberration curves, astigmatism curves, and distortion curves of the visual systems according to Embodiments One, Two, and Three of the application are shown respectively;

[0025] Figure 10 A structural schematic diagram of a visual system according to Embodiment Four of the application is shown;

[0026] Figure 11 A structural diagram of a vision system according to an embodiment of the present application is shown;

[0027] Figure 12 A structural diagram of a vision system according to an embodiment of the present application is shown;

[0028] Figures 13A to 13C Axial chromatic aberration curves, astigmatism curves and distortion curves of the vision systems according to embodiments four, five and six of the present application are shown, respectively;

[0029] Figure 14 A structural diagram of a positioning system according to an embodiment of the present application is shown;

[0030] Figure 15 A structural diagram of a positioning system according to an embodiment of the present application is shown;

[0031] Figure 16 A structural diagram of a positioning system according to an embodiment of the present application is shown;

[0032] Figures 17A to 17C Axial chromatic aberration curves, astigmatism curves and distortion curves of the positioning systems according to embodiments seven, eight and nine of the present application are shown, respectively;

[0033] Figure 18 A structural diagram of a positioning system according to an embodiment of the present application is shown;

[0034] Figure 19 A structural diagram of a positioning system according to an embodiment of the present application is shown;

[0035] Figure 20 A structural diagram of a positioning system according to an embodiment of the present application is shown; and

[0036] Figures 21A to 21C Axial chromatic aberration curves, astigmatism curves and distortion curves of the positioning systems according to embodiments ten, eleven and twelve of the present application are shown, respectively. DETAILED DESCRIPTION

[0037] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of exemplary embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements.

[0038] It should be noted that the expressions first, second, third and the like in the present specification are used only to distinguish one feature from another, and do not denote any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0039] In the drawings, the thickness, size, and shape of the lenses and / or the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical surface or the aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0040] In the present specification, the paraxial region refers to a region near the optical axis. If the surface of the lens and / or the lens is convex and the position of the convex surface is not specified, it means that the surface of the lens and / or the lens is convex at least in the paraxial region. If the surface of the lens and / or the lens is concave and the position of the concave surface is not specified, it means that the surface of the lens and / or the lens 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 surface of the lens, and the surface of each lens closest to the second side (e.g., the emitting portion side) is referred to as the second side surface of the lens. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging surface is referred to as the image side surface of the lens.

[0041] It should also be understood that the words “comprise”, “comprising”, “include”, “including”, and / or “contain”, 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 the embodiments of the present application, the use of “may” means “one or more embodiments of the present application”. Also, the word “exemplary” is intended to mean an example or an illustration.

[0042] 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 should also be understood that the terms 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.

[0043] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0044] The features, principles, and other aspects of the present application are described in detail below.

[0045] Reference is made to Figure 1 The first aspect of the present application provides a virtual reality module, which can include a vision system and a positioning system. The positioning system is used to capture a picture in the surrounding environment or the pose of the user. The vision system dynamically adjusts the virtual image of the emitting part according to the positioning result obtained from the picture in the surrounding environment or the pose of the user and projects the virtual image. The number of vision systems can be one or more, and the number of positioning systems can be one or more. In an example, the virtual reality module can include two vision systems arranged symmetrically. It should be understood that the virtual reality module provided by the present application can also include any optical system other than the vision system and the positioning system, such as a first optical system.

[0046] The positioning system in the present application collects the picture in the surrounding environment or the pose of the user, which 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 and determines the information required to be displayed by the vision system according to the analysis result, and then transmits the information required to be displayed by the vision system to the vision system. The vision system dynamically adjusts the virtual image of the emitting part according to the received information required to be displayed, and finally projects the virtual image to the receiving part, such as the eyes of the user, so as to make the user feel immersive. The virtual reality module provided by the present application combines the virtual immersion of the vision system with the positioning function of the positioning system, breaks through the spatial limitation of the virtual reality device, and realizes the interaction between the real world and the virtual world of the virtual reality device.

[0047] In an example embodiment, with reference to Figure 2 and Figure 3 The vision system can include a first lens barrel and an optical element group disposed in the first lens barrel, and the optical element group can include a first lens, a second lens, and a third lens arranged in order from a first side to a second side along a first optical axis. There can be an air gap between adjacent two lenses among the first lens to the third lens.

[0048] In an example embodiment, with reference to Figure 2 The vision system can include a spacer group disposed in the first lens barrel, and the spacer group can include a first spacer and / or a second spacer. The first spacer can be disposed on and at least partially in contact with the second side of the first lens, and the second spacer can be disposed on and at least partially in contact with the second side of the second lens. Reasonable use of spacers can effectively avoid the risk of stray light, reduce the interference with the image quality, and thus improve the imaging quality of the vision system.

[0049] In an example embodiment, the optical element group can further include a reflection assembly. The reflection assembly can include a reflective polarizing element and a quarter-wave plate. In other examples, the reflection assembly can further include a partial reflection layer attached to the first side or the second side of the third lens, where the partial reflection layer has a semi-transmissive and semi-reflective effect on the light rays. By providing the partial reflection layer on the first side or the second side of the third lens, in combination with the reflective polarizing element and the quarter-wave plate, the light rays can be folded multiple times, effectively reducing the length of the visual system.

[0050] In an example embodiment, the reflective polarizing element can be attached to the first side of the first lens, and the quarter-wave plate can be attached to the second side of the second lens.

[0051] In an example embodiment, the second side of the second lens is configured as a plane, and the reflective polarizing element and the quarter-wave plate are bonded to form a film layer, where the bonded film layer is attached to the second side of the second lens, and the reflective polarizing element is closer to the second lens than the quarter-wave plate. By bonding the reflective polarizing element and the quarter-wave plate together to form a film layer, the number of attachment surfaces of the film layer can be reduced, improving the attachment yield of the film layer. Moreover, the bonded film layer is attached to a plane, which is conducive to improving the stability of the film layer after attachment, thereby improving the performance of the visual system.

[0052] In an example embodiment, the first side can be a receiving portion side, and the second side can be an emitting portion side. Accordingly, the first side of each element (the first lens, the second lens, and the third lens) can be referred to as a proximal receiving portion side, and the second side can be referred to as a proximal emitting portion side.

[0053] In an example embodiment, the visual system can further include a diaphragm, which can be disposed between the first side and the first lens, for example. The image light of the emitting portion is finally projected to the receiving portion after multiple refractions and reflections by the third lens, the quarter-wave plate, the second lens, the first lens, the reflective polarizing element, and the like.

[0054] In an example embodiment, the image light from the emitting portion can 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 the 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 is finally projected to the receiving portion. In other examples, the image light from the emitting portion can 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 the second reflected image light. The second reflected image light sequentially passes through the third lens, the quarter wave plate, the reflective polarizing element, the second lens, the first lens, to the diaphragm, and is finally projected to the receiving portion. The visual system provided in the present application effectively shortens the body length of the visual system by combining light reflection and refraction to fold the required optical path without affecting the projection quality.

[0055] In an example embodiment, referring to Figure 4 and Figure 5 , the positioning system can include a second lens barrel and a five-piece lens group disposed in the second lens barrel. The five-piece lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in order from an object side to an image side along a second optical axis. Adjacent two lenses among the first lens to the fifth lens can have an air gap. In an example, the first lens and the second lens both have negative refractive powers, and the third lens, the fourth lens, and the fifth lens all have positive refractive powers.

[0056] In an example embodiment, referring to Figure 4 , the positioning system can include a positioning member group disposed in the second lens barrel. The positioning member group can include one or more of a first positioning member, a second positioning member, and a third positioning member. The first positioning member can be disposed on and at least partially in contact with an image side surface of the first lens, the second positioning member can be disposed on and at least partially in contact with an image side surface of the second lens, and the third positioning member can be disposed on and at least partially in contact with an image side surface of the third lens. Reasonable use of the positioning member can effectively avoid stray light risk, reduce interference with image quality, and thus improve the imaging quality of the positioning system.

[0057] In the example embodiment, the sum of the effective focal lengths of the first lens to the third lens F', the length of the first lens barrel in the direction of the first optical axis L', the sum of the air intervals of any two adjacent lenses among the first lens to the third lens on the first optical axis ∑AT', the sum of the effective focal lengths of the first mirror to the fifth mirror F, the length of the second lens barrel in the direction of the second optical axis L, and the sum of the air intervals of any two adjacent mirrors among the first mirror to the fifth mirror on the second optical axis ∑AT can satisfy: 88<|F'|×(L' / ∑AT') / (F×(L / ∑AT))<3510. As an example, 2850<|F'|×(L' / ∑AT') / (F×(L / ∑AT))<3510. By controlling the sum of the focal lengths of all the lenses in the visual system and the sum of the focal lengths of all the mirrors in the positioning system, the field of view angles of the visual system and the positioning system can be constrained so that the visual system and the positioning system meet the characteristics of a large field of view angle to achieve their functional requirements; at the same time, by reasonably matching the length of the first lens barrel, the length of the second lens barrel, and the sum of the air intervals of all the lenses and / or all the mirrors on the corresponding optical axis, the length of the visual system and the positioning system can be shortened under the premise of ensuring the machinability and optical performance, the miniaturization of the visual system and the positioning system is achieved, the overall layout is facilitated, the overall weight is reduced, and the comfort and immersive experience of the user when wearing are improved.

[0058] In the example embodiment, the curvature radius of the first side surface of the first lens R1', the curvature radius of the second side surface of the first lens R2', the inner diameter of the first side surface of the first spacer d1s', and the interval EP01' of the first side end surface of the first lens barrel and the first spacer along the first optical axis can satisfy: 8.0<d1s'×(R1' / R2') / EP01'<17.0. By controlling the curvature radii of the first side surface and the second side surface of the first lens, the optical power of the first lens can be constrained, which is conducive to correcting imaging aberrations; at the same time, by reasonably matching the inner diameter of the first side surface of the first spacer and the interval of the first side end surface of the first lens barrel and the first spacer along the first optical axis, the front end thickness of the first lens barrel and the thickness of the non-effective diameter part of the first lens can be appropriate under the premise of ensuring the support of the first spacer to the first lens, so as to meet the requirements of its forming machining and assembly.

[0059] In the example embodiment, the total effective focal length f' of the visual system, the central thickness drp of the reflective polarizing element on the first optical axis, the central thickness dqwp of the quarter-wave plate on the first optical axis, the sum of the central thicknesses of the first lens to the third lens on the first optical axis, and the interval EP01' of the first side end face of the first lens barrel and the first spacer along the first optical axis can satisfy: 1.0 < f' / (EP01'+drp+dqwp+∑CT') < 1.5. By controlling the total effective focal length of the visual system, the field of view angle of the visual system can be constrained so that the visual system meets the characteristics of a large field of view angle; at the same time, by reasonably matching the interval of the first side end face 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 sum of the central thicknesses of the first lens to the third lens on the first optical axis, the body length of the visual system can be reduced, which is conducive to miniaturization of the visual system.

[0060] In the example embodiment, the radius of curvature R2' of the second side face of the first lens, the radius of curvature R3' of the first side face of the second lens, the inner diameter d1m' of the second side face of the first spacer, and the inner diameter d2s' of the first side face of the second spacer can satisfy: 0 < R2' / d1m'-R3' / d2s' < 1.0. By controlling the radii of curvature of the second side face of the first lens and the first side face of the second lens, the refractive powers of the first lens and the second lens can be constrained; at the same time, by reasonably matching 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, the support of the two spacers to the first lens and the second lens is ensured, and the excess light can be blocked and the stray light problem of the visual system can be improved.

[0061] In the example 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 face of the first lens barrel, and the outer diameter D0m' of the second side end face of the first lens barrel can satisfy: 5.0 < |f1'+f3'| / (D0s'+D0m') < 128.0. As an example, 120.0 < |f1'+f3'| / (D0s'+D0m') < 128.0. By controlling the effective focal lengths of the first lens and the third lens, the directions of the light rays entering and exiting the corresponding lenses can be constrained; at the same time, by reasonably matching the outer diameters of the first side end face and the second side end face of the first lens barrel, the uniformity of the overall wall thickness of the first lens barrel and the formability are ensured, and the abutting faces between the lenses have a reasonable step difference, which is conducive to improving the assembly stability of the visual system.

[0062] In the example 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 lens barrel, and the inner diameter d1m of the image side surface of the first positioning member can satisfy: -4.0 < d0s / f1 + d1m / f2 < -2.5, where f1 < 0 and f2 < 0. By controlling the effective focal lengths of the first lens and the second lens to be negative, the field of view of the positioning system can be increased. Meanwhile, by matching 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 member, the aperture of the second lens barrel can be reduced while ensuring the large field of view of the positioning system, and the support of the first positioning member to the first lens and the second lens can be ensured.

[0063] In the example embodiment, the curvature radius R2 of the image side surface of the first lens, the curvature radius 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 can satisfy: 10.0 mm < R2 < 20.0 mm, 10.0 mm < R4 < 20.0 mm, 0.0 mm < d1m < 2.0 mm, 0.0 mm < d2m < 2.0 mm, 2.0 mm < D1m < 4.0 mm, and 2.0 mm < D2m < 4.0 mm. By controlling the curvature radii 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 constrained, which is beneficial to ensuring the uniformity and processability of the two lenses. Meanwhile, by matching the inner and outer diameters of the image side surfaces of the first positioning member and the second positioning member, the support of the two positioning members to the first lens and the second lens can be ensured, and the excess light can be blocked, and the stray light problem of the positioning system can be improved. 2 2 By controlling the curvature radii 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 constrained, which is beneficial to ensuring the uniformity and processability of the two lenses. Meanwhile, by matching the inner and outer diameters of the image side surfaces of the first positioning member and the second positioning member, the support of the two positioning members to the first lens and the second lens can be ensured, and the excess light can be blocked, and the stray light problem of the positioning system can be improved.

[0064] In the example embodiment, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the central thickness CT2 of the second lens on the second optical axis, the central thickness CT3 of the third lens on the second optical axis, the air gap 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 can satisfy: 0 < f3 x (T23 / CT3) / |f2 x (EP23 / CT2)| < 5.0. By controlling the above condition, the optical power of the second lens and the third lens can be reasonably distributed, which is beneficial to constraining the light path. Meanwhile, the thickness ratio of the second lens and the third lens can also be limited, which is beneficial to the molding of the second lens and the third lens.

[0065] ​In the example 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 can satisfy: 0.5<|(f1+f2+f3)| / (EP12+EP23)<1.3. By reasonably allocating the effective focal lengths of the first lens, the second lens, and the third lens, the exit angle of the light from the third lens is limited. Meanwhile, by reasonably allocating the interval of the first positioning member and the second positioning member along the second optical axis and the interval of the second positioning member and the third positioning member along the second optical axis, the thickness of the non-effective diameter part of the second lens and the third lens is indirectly constrained, thereby improving the processability and assembly stability of the second lens and the third lens.

[0066] In the example 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 positioning member, and the inner diameter d0m of the image side end surface of the second lens barrel can satisfy: 0<d3m×R7 / |d0m×R10|<1.0. By controlling the radius of curvature of the object side surface of the fourth lens and the image side surface of the fifth lens, the final imaging quality of the positioning system is improved. Meanwhile, by reasonably allocating the inner diameter of the image side surface of the third positioning member and the inner diameter of the image side end surface of the second lens barrel, the excess light generated at the front end is blocked, and the imaging quality of the positioning system is improved.

[0067] The virtual reality module according to the above-described embodiments of the present application is composed of a visual system and a positioning system. The visual system can adopt multiple lenses, for example, the three lenses described above, and the positioning system can adopt multiple lenses, for example, the five lenses described above. By reasonably configuring the parameters of the visual system and the positioning system, the imaging quality and the visual immersion of the virtual reality module can be improved. The virtual reality module configured as described above has the characteristics of miniaturization and good imaging quality, and can well meet the use requirements of various portable electronic products in the projection scene.

[0068] In the embodiments of the present application, at least one of the surfaces of each of the first lens to the third lens is a non-spherical surface. The characteristic of the non-spherical lens is that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens with constant curvature from the center of the lens to the periphery of the lens, the non-spherical lens has better curvature radius characteristics, and has the advantages of improving the distortion aberration and improving the astigmatism aberration. After adopting the non-spherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Similarly, at least one of the surfaces of each of the first lens to the fifth lens is a non-spherical surface.

[0069] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses and / or mirrors can be changed to obtain the various results and advantages described in this specification.

[0070] Specific embodiments of the visual system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0071] Example One

[0072] The following is for reference Figure 6 A visual system according to Embodiment 1 of this application is described.

[0073] like Figure 6 As shown, the visual system 100 includes a first lens barrel P0' and an optical element group and a spacer group disposed within the first lens barrel P0'. The optical element group includes a first lens E1', a second lens E2', and a third lens E3' arranged sequentially from a first side to a second side along a first optical axis. The optical element group also includes a reflection assembly, which includes a reflective polarizing element RP, a quarter-wave plate QWP, and a partial reflective layer BS. The spacer group includes a first spacer P1' and a second spacer P2'. In this embodiment, the first side refers to the receiving side, and the second side refers to the transmitting 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 the side near the receiving side, and the second side is referred to as the side near the transmitting side.

[0074] The first lens E1' has positive optical power, with its receiving side S1 being concave and its emitting side S2 being convex. The second lens E2' has positive optical power, with its receiving side S3 being concave and its emitting side S4 being convex. The third lens E3' has positive optical power, with its receiving side S5 being concave and its emitting side S6 being convex. A reflective polarizing element RP is attached to the receiving side S1 of the first lens E1'. A quarter-wave plate QWP is attached to the emitting side S4 of the second lens E2'. A partial reflective layer BS can be attached to the receiving side S5 of the third lens E3'.

[0075] In this example, the image light from the emitting part sequentially passes through the third lens E3', the quarter wave plate QWP, the second lens E2', the first lens E1', and reaches the reflective polarizing element RP, and the first reflection occurs at the reflective polarizing element RP. The light after the first reflection passes through the first lens E1', the second lens E2', the quarter wave plate QWP, and reaches the partial reflection layer BS, and the second reflection occurs at the partial reflection layer BS. The light after the second reflection sequentially passes through the quarter wave plate QWP, the second lens E2', the first lens E1', the reflective polarizing element RP, and finally projects to the receiving part. For example, the light after two reflections of the visual system 100 finally projects to the receiving part.

[0076] Table 1 shows the basic parameter table of the visual system of Example 1, wherein the units of the radius of curvature, thickness / distance are millimeters (mm). The image light from the emitting part sequentially passes through each element in the order of No. 19 to No. 1 and finally projects into the receiving part.

[0077]

[0078] Table 1

[0079] In this embodiment, the total effective focal length f' of the visual system is 27.33 mm, the half of the maximum field of view angle Semi-FOV' of the visual system is 53.0°, the effective focal length f1' of the first lens E1' is 17586.47 mm, the effective focal length f2' of the second lens E2' is 243.09 mm, the effective focal length f3' of the third lens E3' is 1186.53 mm, and the sum F' of the effective focal lengths of the first lens to the third lens is 19016.09 mm.

[0080] In this embodiment, the near-receiving part side S1 and the near-emitting part side S2 of the first lens E1', the near-receiving part side S3 and the near-emitting part side S4 of the second lens E2', and the near-receiving part side S5 and the near-emitting part side S6 of the third lens E3' are all aspherical surfaces, and the surface type of each aspherical lens is The following aspherical formula can be used, but is not limited to, for definition:

[0081] (1)

[0082] wherein, is the sag of the aspherical surface at the height of h from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c =1 / R' (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R' in Table 1 above); kis a conic coefficient; Ai is a conic coefficient of the aspheric surface i -th order. Table 2 gives the conic coefficients k and high-order coefficients A 4 , A 6 , A 8 and A 10 .

[0083]

[0084] Table 2

[0085] Example Two

[0086] The visual system according to Embodiment Two of the present application is described below with reference to Figure 7 .

[0087] As shown in Figure 7 , the visual system 100 includes a first lens barrel P0' and an optical element group and a spacer group disposed in the first lens barrel P0'. The optical element group includes a first lens E1', a second lens E2', and a third lens E3' arranged in order from a first side to a second side along a first optical axis. The optical element group further includes a reflection assembly including a reflective 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'.

[0088] The structure of the optical element group of the present embodiment is the same as that of the optical element group of Embodiment One, i.e., the basic parameter table of the visual system of the present embodiment is the same as Table 1, and the aspheric surface coefficient table is the same as Table 2. The difference between the present embodiment and Embodiment One is that the structures and sizes of the first lens barrel P0', the first spacer P1', and the second spacer P2' are different. For example, the length L' of the first lens barrel in the direction of the first optical axis, the inner diameter d1s' of the first side surface of the first spacer, the inner diameter d1m' of the second side surface of the first spacer, the interval EP01' of the first side end surface of the first lens barrel and the first spacer along the first optical axis, the inner diameter d2s' of the first side surface of the second spacer, the outer diameter D0s' of the first side end surface of the first lens barrel, the outer diameter D0m' of the second side end surface of the first lens barrel, and the like are different.

[0089] Example Three

[0090] The visual system according to Embodiment Three of the present application is described below with reference to Figure 8 .

[0091] As shown in Figure 8As shown, the visual system 100 includes a first lens barrel P0' and an optical element group and a spacer group disposed in the first lens barrel P0'. The optical element group includes a first lens E1', a second lens E2' and a third lens E3' arranged in order from a first side to a second side along a first optical axis. The optical element group further includes a reflection assembly including a reflective 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'.

[0092] The structure of the optical element group of the present embodiment is the same as that of the optical element group of Embodiment One, i.e., the basic parameter table of the visual system of the present embodiment is the same as Table 1, and the aspherical coefficient table is the same as Table 2. The difference between the present embodiment and Embodiment One lies in the structural dimensions of the first lens barrel P0', the first spacer P1' and the second spacer P2'. For example, the length L' of the first lens barrel in the direction of the first optical axis, the inner diameter d1s' of the first side face of the first spacer, the inner diameter d1m' of the second side face of the first spacer, the interval EP01' of the first side end face of the first lens barrel and the first spacer along the first optical axis, the inner diameter d2s' of the first side face of the second spacer, the outer diameter D0s' of the first side end face of the first lens barrel, the outer diameter D0m' of the second side end face of the first lens barrel, etc. are different.

[0093] Table 3 gives some basic parameters of the first lens barrel P0', the first spacer P1' and the second spacer P2' of Embodiments One to Three, such as L', d1s', d1m', EP01', d2s', D0s' and D0m', etc. Some of the basic parameters listed in Table 3 are measured according to the labeling method shown in Table 1, and the units of the basic parameters listed in Table 3 are all millimeters (mm). Figure 2

[0094]

[0095] Table 3

[0096] Figure 9A The on-axis chromatic aberration curves of the visual system 100 of Embodiments One, Two and Three are shown, which represent the convergence focus deviation of light rays of different wavelengths after passing through the visual system 100. Figure 9B The astigmatism curves of the visual system 100 of Embodiments One, Two and Three are shown, which represent the meridional image surface curvature and sagittal image surface curvature corresponding to different half-visual field angles. Figure 9C The distortion curves of the visual system 100 of Embodiments One, Two and Three are shown, which represent the distortion size values corresponding to different half-visual field angles. According to the distortion curves, it can be known that the visual system 100 of Embodiments One, Two and Three can achieve good imaging quality. Figures 9A to 9C

[0097] Example Four ​​

[0098] The following description refers to Figure 10 A visual system according to Embodiment Four is described.

[0099] As Figure 10 shown, the visual system 100 includes a first lens barrel P0' and an optical element group and a spacer group disposed within the first lens barrel P0'. The optical element group includes a first lens E1', a second lens E2', and a third lens E3' arranged in order from a first side to a second side along a first optical axis. The optical element group also includes a reflection assembly including a reflective 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 this embodiment, the first side refers to the receiving portion side, and the second side refers to the emitting portion side. The first side of each element (e.g., the first lens E1', the second lens E2', the third lens E3') is referred to as a proximal receiving portion side, and the second side is referred to as a proximal emitting portion side.

[0100] The first lens E1' has a negative focal power, with a proximal receiving portion side S1 that is convex and a proximal emitting portion side S2 that is concave. The second lens E2' has a positive focal power, with a proximal receiving portion side S3 that is convex and a proximal emitting portion side S4 that is planar. The third lens E3' has a positive focal power, with a proximal receiving portion side S5 that is convex and a proximal emitting portion side S6 that is convex. The reflective polarizing element RP and the quarter wave plate QWP are bonded to form a film layer, and the film layer is attached to the proximal emitting portion side S4 of the second lens E2', with the reflective polarizing element RP closer to the second lens E2' than the quarter wave plate QWP. The partially reflective layer BS can be attached to the proximal emitting portion side S6 of the third lens E3'.

[0101] In this example, image light from the emitting portion passes through the third lens E3', the quarter wave plate QWP, and reaches the reflective polarizing element RP, where a first reflection occurs. The light after the first reflection passes through the quarter wave plate QWP, the third lens E3', and reaches the partially reflective layer BS, where a second reflection occurs. The light after the second reflection passes through the third lens E3', the quarter wave plate QWP, the reflective polarizing element RP, the second lens E2', the first lens E1', and finally projects into the receiving portion. For example, the light after two reflections of the visual system 100 finally projects into the receiving portion.

[0102] Table 4 shows a table of basic parameters of the visual system of Embodiment Four, where the units of the radius of curvature, thickness / distance are millimeters (mm). Image light from the emitting portion passes through each element in order of No. 15 to No. 1 and finally projects into the receiving portion.

[0103]

[0104] Table 4

[0105] In the present embodiment, the total effective focal length f' of the visual system is 30.62 mm, the half of the maximum field of view 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 229.74 mm, the effective focal length f3' of the third lens E3' is 147.17 mm, and the sum F' of the effective focal lengths of the first lens to the third lens is -700.92 mm.

[0106] 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 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 aspherical surfaces. Table 5 gives the conic coefficients k and the high order coefficients A 4 、 A 6 、 A 8 and A 10 .

[0107]

[0108] Table 5

[0109] Example Five

[0110] A visual system according to Embodiment Five of the present application is described below with reference to Figure 11 .

[0111] As shown in Figure 11 , the visual system 100 includes a first lens barrel P0' and an optical element group and a spacer group disposed in the first lens barrel P0'. The optical element group includes a first lens E1', a second lens E2', and a third lens E3' arranged in order from a first side to a second side along a first optical axis. The optical element group further includes a reflection assembly including a reflective polarizing element RP, a quarter-wave plate QWP, and a partially reflective layer BS. The spacer group includes a first spacer P1'.

[0112] The structure of the optical element group in this embodiment is the same as that in Embodiment 4. That is, the basic parameter table of the visual system in this embodiment is the same as Table 4, and the aspherical coefficient table is the same as Table 5. The difference between this embodiment and Embodiment 4 is that the structural dimensions of the first lens barrel P0' and the first spacer P1' are different. For example, the length L' of the first lens barrel in the direction of the first optical axis, the inner diameter d1s' of the first side of the first spacer, the inner diameter d1m' of the second side of the first spacer, the spacing EP01' between the first side end face of the first lens barrel and the first spacer along the first optical axis, the outer diameter D0s' of the first side end face of the first lens barrel, and the outer diameter D0m' of the second side end face of the first lens barrel are different.

[0113] Example Six

[0114] The following is for reference Figure 12 A visual system according to Embodiment Six of this application is described.

[0115] like Figure 12 As shown, the visual system 100 includes a first lens barrel P0' and an optical element assembly and a spacer assembly disposed within the first lens barrel P0'. The optical element assembly includes a first lens E1', a second lens E2', and a third lens E3' arranged sequentially along a first optical axis from a first side to a second side. The optical element assembly also includes a reflection assembly, which includes a reflective polarizing element RP, a quarter-wave plate QWP, and a partial reflective layer BS. The spacer assembly includes a first spacer P1' and a second spacer P2'.

[0116] The structure of the optical element group in this embodiment is the same as that in Embodiment 4. That is, the basic parameter table of the visual system in this embodiment is the same as Table 4, and the aspherical coefficient table is the same as Table 5. The difference between this embodiment and Embodiment 4 is that the structural dimensions of the first lens barrel P0', the first spacer P1', and the second spacer P2' are different. For example, the length L' of the first lens barrel in the direction of the first optical axis, the inner diameter d1s' of the first side of the first spacer, the inner diameter d1m' of the second side of the first spacer, the spacing EP01' between the first side end face of the first lens barrel and the first spacer along the first optical axis, the inner diameter d2s' of the first side of the second spacer, the outer diameter D0s' of the first side end face of the first lens barrel, and the outer diameter D0m' of the second side end face of the first lens barrel are different.

[0117] Table 6 provides some basic parameters of the first lens barrel P0', the first spacer P1', and the second spacer P2' in embodiments four to six, such as L', d1s', d1m', EP01', d2s', D0s', and D0m'. The basic parameters listed in Table 6 are based on... Figure 2 The measurements were obtained using the annotation method shown, and the units of the basic parameters listed in Table 6 are all millimeters (mm).

[0118]

[0119] Table 6

[0120] Figure 13A The on-axis chromatic aberration curves of the visual system 100 in embodiments four, five, and six are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the visual system 100. Figure 13B Astigmatism curves of the visual system 100 in embodiments four, five, and six are shown, representing the meridional and sagittal image plane curvatures corresponding to different half-field angles. Figure 13C The distortion curves of the visual system 100 in embodiments four, five, and six are shown, representing the distortion magnitude values ​​corresponding to different half-field angles. According to... Figures 13A to 13C It can be seen that the visual system 100 given in Examples 4, 5 and 6 can achieve good imaging quality.

[0121] The following describes specific embodiments of the positioning system applicable to the above-described embodiments with reference to the accompanying drawings.

[0122] Example Seven

[0123] The following is for reference Figure 14 The positioning system according to Embodiment Seven of this application is described.

[0124] like Figure 14 As shown, the positioning system 200 includes a second lens barrel P0 and a five-element lens group and a positioning element group disposed within the second lens barrel P0. The five-element lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the second optical axis from the object side to the image side. An aperture stop STO may be disposed between the third lens E3 and the fourth lens E4. The positioning element group includes a first positioning element P1, a second positioning element P2, and a third positioning element P3.

[0125] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13. The fourth and fifth lenses are cemented together to form a cemented lens.

[0126] Table 7 shows the basic parameter table of the positioning system of Example Seven, wherein the units of the radius of curvature, the thickness / distance are all millimeters (mm).

[0127]

[0128] Table 7

[0129] In this embodiment, the total effective focal length f of the positioning system is 0.93 mm, the half of the maximum field of view angle Semi-FOV of the positioning system is 83.3°, and the sum of the effective focal lengths of the first to fifth lenses F is 13.97 mm.

[0130] In this embodiment, the object side and the image side of any one of the second to fifth lenses E2-E5 are aspherical surfaces, and the surface types of the aspherical lenses are The aspherical surfaces can be defined by, but not limited to, the following aspherical formula:

[0131] (1)

[0132] wherein, is the sag of the aspherical surface at the position with the height h from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c =1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the aspherical surface at the i -th order. Table 8 shows the high-order coefficient A 4 , A 6 , A 8 , A 10 , A 12 , A 14 and A 16 .

[0133]

[0134] Table 8

[0135] Example Eight

[0136] The positioning system according to Example Eight of the present application is described below with reference to Figure 15 ​

[0137] As shown in Figure 15 , the positioning system 200 comprises a second lens barrel P0, and a five-piece lens group and a positioning piece group disposed in the second lens barrel P0. The five-piece lens group comprises, in order from the object side to the image side along the second optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. A stop STO can 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.

[0138] The structure of the five-piece lens group of the present embodiment is the same as that of the five-piece lens group of Embodiment Seven, i.e., the basic parameter table of the positioning system of the present embodiment is the same as Table 7, and the aspherical coefficient table is the same as Table 8. The difference between the present embodiment and Embodiment Seven lies in the structural dimensions of the second lens barrel P0, the first positioning piece P1, the second positioning piece P2, and the third positioning piece P3. For example, the length L of the second lens barrel in the direction of the second optical axis, the inner diameter d1s of the object side surface of the first positioning piece, the inner diameter d1m of the image side surface of the first positioning piece, the outer diameter D1m of the image side surface of the first positioning piece, the inner diameter d2m of the image side surface of the second positioning piece, the outer diameter D2m of the image side surface of the second positioning piece, the inner diameter d3m of the image side surface of the third positioning piece, the inner diameter d0s of the object side end surface of the second lens barrel, the inner diameter d0m of the image side end surface of the second lens barrel, the interval EP12 of the first positioning piece and the second positioning piece along the second optical axis, the interval EP23 of the second positioning piece and the third positioning piece along the second optical axis, and the like are different.

[0139] Example Nine

[0140] The positioning system according to Embodiment Nine of the present application is described below with reference to Figure 16 .

[0141] As shown in Figure 16 , the positioning system 200 comprises a second lens barrel P0, and a five-piece lens group and a positioning piece group disposed in the second lens barrel P0. The five-piece lens group comprises, in order from the object side to the image side along the second optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. A stop STO can 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.

[0142] The structure of the five-piece lens set of the embodiment is the same as that of the five-piece lens set of embodiment seven, i.e., the basic parameter table of the positioning system of the embodiment is the same as table 7, and the aspheric coefficient table is the same as table 8. The difference between the embodiment and embodiment seven is that the structure sizes of the second lens barrel P0, the first positioning member P1, the second positioning member P2, and the third positioning member P3 are different. For example, the length L of the second lens 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 lens barrel, the inner diameter d0m of the image side end surface of the second lens 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.

[0143] Table 9 gives some basic parameters of the second lens barrel P0, the first positioning member P1, the second positioning member P2, and the third positioning member P3 of embodiments seven to nine, such as L, d1m, D1m, d2m, D2m, d3m, d0s, d0m, EP12, EP23, and the like. Some of the basic parameters listed in table 9 are measured according to the labeling method shown in table 8, and the units of the basic parameters listed in table 9 are all millimeters (mm). Figure 4

[0144]

[0145] Table 9

[0146] Figure 17A The on-axis chromatic aberration curves of the positioning system 200 of embodiments seven, eight, and nine are shown, which represent the convergence focus deviation of light rays of different wavelengths after passing through the positioning system 200. Figure 17B The astigmatism curves of the positioning system 200 of embodiments seven, eight, and nine are shown, which represent the meridional image surface curvature and sagittal image surface curvature corresponding to different half view angles. Figure 17C The distortion curves of the positioning system 200 of embodiments seven, eight, and nine are shown, which represent the distortion size values corresponding to different half view angles. According to Figures 17A to 17C It can be known that the positioning system 200 given in embodiments seven, eight, and nine can achieve good imaging quality.

[0147] Example Ten

[0148] The positioning system according to embodiment ten of the present application is described below with reference to Figure 18

[0149] As Figure 18 ​​As shown, the positioning system 200 comprises a second lens barrel P0, and a five-piece lens group and a positioning member group disposed within the second lens barrel P0. The five-piece lens group comprises, in order from the object side to the image side along the second optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. A stop STO can be disposed between the third lens E3 and the fourth lens E4. The positioning member group comprises a first positioning member P1, a second positioning member P2, and a third positioning member P3.

[0150] The first lens E1 has a negative optical power, with a convex object side surface S1 and a concave image side surface S2. The second lens E2 has a negative optical power, with a convex object side surface S3 and a concave image side surface S4. The third lens E3 has a positive optical power, with a concave object side surface S5 and a convex image side surface S6. The fourth lens E4 has a negative optical power, with a convex object side surface S7 and a concave image side surface S8. The fifth lens E5 has a positive optical power, with a convex object side surface S9 and a convex image side surface S10. The filter E6 has an object side surface S11 and an image side surface S12. Light from an object passes through the surfaces S1 to S12 in order and is ultimately imaged on an image plane S13. The fourth lens and the fifth lens are cemented to form a cemented lens.

[0151] Table 10 shows a basic parameter table of the positioning system of Example Ten, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0152]

[0153] Table 10

[0154] In this embodiment, the total effective focal length f of the positioning system has a value of 1.09 mm, the half of the maximum field of view angle Semi-FOV of the positioning system has a value of 75.0°, and the sum F of the effective focal lengths of the first lens to the fifth lens has a value of 15.38 mm.

[0155] 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 surfaces. Table 11 shows the high-order term coefficients of the aspherical surfaces S3-S10 that can be used in Example Ten A 4 、 A 6 、 A 8 、 A 10 、 A 12 、 A 14 and A 16 .

[0156]

[0157] Table 11

[0158] Example Eleven

[0159] The following is for reference Figure 19 The positioning system according to Embodiment Eleven of this application is described.

[0160] like Figure 19 As shown, the positioning system 200 includes a second lens barrel P0 and a five-element lens group and a positioning element group disposed within the second lens barrel P0. The five-element lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the second optical axis from the object side to the image side. An aperture stop STO may be disposed between the third lens E3 and the fourth lens E4. The positioning element group includes a first positioning element P1, a second positioning element P2, and a third positioning element P3.

[0161] The structure of the five-element lens group in this embodiment is the same as that in Embodiment 10. That is, the basic parameter table of the positioning system in this embodiment is the same as Table 10, and the aspherical coefficient table is the same as Table 11. The difference between this embodiment and Embodiment 10 is that the structural dimensions of the second lens barrel P0, the first positioning member P1, the second positioning member P2, and the third positioning member P3 are different. For example, the length L of the second lens barrel in the direction of the second optical axis, the inner diameter d1s of the object side of the first positioning member, the inner diameter d1m of the image side of the first positioning member, the outer diameter D1m of the image side of the first positioning member, the inner diameter d2m of the image side of the second positioning member, the outer diameter D2m of the image side of the second positioning member, the inner diameter d3m of the image side of the third positioning member, the inner diameter d0s of the object side end face of the second lens barrel, the inner diameter d0m of the image side end face of the second lens barrel, the distance EP12 between the first and second positioning members along the second optical axis, and the distance EP23 between the second and third positioning members along the second optical axis are different.

[0162] Example Twelve

[0163] The following is for reference Figure 20 The positioning system according to Embodiment Twelve of this application is described.

[0164] like Figure 20 As shown, the positioning system 200 includes a second lens barrel P0 and a five-element lens group and a positioning element group disposed within the second lens barrel P0. The five-element lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the second optical axis from the object side to the image side. An aperture stop STO may be disposed between the third lens E3 and the fourth lens E4. The positioning element group includes a first positioning element P1, a second positioning element P2, and a third positioning element P3.

[0165] The five-piece lens set of the embodiment has the same structure as the five-piece lens set of embodiment ten, i.e., the basic parameter table of the positioning system of the embodiment is the same as table 10, and the aspherical coefficient table is the same as table 11. The difference between the embodiment and embodiment ten lies in that the structural sizes of the second lens barrel P0, the first positioning member P1, the second positioning member P2, and the third positioning member P3 are different. For example, the length L of the second lens 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 lens barrel, the inner diameter d0m of the image side end surface of the second lens 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.

[0166] Table 12 gives some basic parameters of the second lens barrel P0, the first positioning member P1, the second positioning member P2, and the third positioning member P3 of embodiments ten to twelve, such as L, d1m, D1m, d2m, D2m, d3m, d0s, d0m, EP12, EP23, and the like. Some of the basic parameters listed in table 12 are measured according to the labeling method shown in table 11, and the units of the basic parameters listed in table 12 are all millimeters (mm). Figure 4

[0167]

[0168] Table 12

[0169] Figure 21A The on-axis chromatic aberration curves of the positioning system 200 of embodiments ten, eleven, and twelve are shown, which represent the convergence focus deviation of light rays of different wavelengths after passing through the positioning system 200. Figure 21B The astigmatism curves of the positioning system 200 of embodiments ten, eleven, and twelve are shown, which represent the meridional image surface curvature and sagittal image surface curvature corresponding to different half view angles. Figure 21C The distortion curves of the positioning system 200 of embodiments ten, eleven, and twelve are shown, which represent the distortion size values corresponding to different half view angles. According to Figures 21A to 21C It can be known that the positioning system 200 given in embodiments ten, eleven, and twelve can achieve good imaging quality.

[0170] Reference Figure 1 ​The virtual reality module 10 provided in the present application can include the visual system 100 in any one of the above embodiments and the positioning system 200 in any one of the above embodiments. Two-by-two combinations of the visual system and the positioning system can form 36 virtual reality modules, i.e., the virtual reality module has 36 examples. Among them,

[0171] Example 1: The virtual reality module includes the visual system of embodiment one and the positioning system of embodiment seven of example seven;

[0172] Example 2: The virtual reality module includes the visual system of embodiment one and the positioning system of embodiment eight;

[0173] Example 3: The virtual reality module includes the visual system of embodiment one and the positioning system of embodiment nine;

[0174] Example 4: The virtual reality module includes the visual system of embodiment one and the positioning system of embodiment ten;

[0175] Example 5: The virtual reality module includes the visual system of embodiment one and the positioning system of embodiment eleven;

[0176] Example 6: The virtual reality module includes the visual system of embodiment one and the positioning system of embodiment twelve;

[0177] Example 7: The virtual reality module includes the visual system of embodiment two and the positioning system of embodiment seven;

[0178] Example 8: The virtual reality module includes the visual system of embodiment two and the positioning system of embodiment eight;

[0179] Example 9: The virtual reality module includes the visual system of embodiment two and the positioning system of embodiment nine;

[0180] Example 10: The virtual reality module includes the visual system of embodiment two and the positioning system of embodiment ten;

[0181] Example 11: The virtual reality module includes the visual system of embodiment two and the positioning system of embodiment eleven;

[0182] Example 12: The virtual reality module includes the visual system of embodiment two and the positioning system of embodiment twelve;

[0183] Example 13: The virtual reality module includes the visual system of embodiment three and the positioning system of embodiment seven;

[0184] Example 14: The virtual reality module includes the visual system of embodiment three and the positioning system of embodiment eight;

[0185] Example 15: The virtual reality module includes the visual system of embodiment three and the positioning system of embodiment nine;

[0186] Example 16: A virtual reality module comprising the vision system of embodiment three and the positioning system of embodiment ten;

[0187] Example 17: A virtual reality module comprising the vision system of embodiment three and the positioning system of embodiment eleven;

[0188] Example 18: A virtual reality module comprising the vision system of embodiment three and the positioning system of embodiment twelve;

[0189] Example 19: A virtual reality module comprising the vision system of embodiment four and the positioning system of embodiment seven;

[0190] Example 20: A virtual reality module comprising the vision system of embodiment four and the positioning system of embodiment eight;

[0191] Example 21 : A virtual reality module comprising the vision system of embodiment four and the positioning system of embodiment nine;

[0192] Example 22: A virtual reality module comprising the vision system of embodiment four and the positioning system of embodiment ten;

[0193] Example 23: A virtual reality module comprising the vision system of embodiment four and the positioning system of embodiment eleven;

[0194] Example 24: A virtual reality module comprising the vision system of embodiment four and the positioning system of embodiment twelve;

[0195] Example 25: A virtual reality module comprising the vision system of embodiment five and the positioning system of embodiment seven;

[0196] Example 26: A virtual reality module comprising the vision system of embodiment five and the positioning system of embodiment eight;

[0197] Example 27: A virtual reality module comprising the vision system of embodiment five and the positioning system of embodiment nine;

[0198] Example 28: A virtual reality module comprising the vision system of embodiment five and the positioning system of embodiment ten;

[0199] Example 29: A virtual reality module comprising the vision system of embodiment five and the positioning system of embodiment eleven;

[0200] Example 30: A virtual reality module comprising the vision system of embodiment five and the positioning system of embodiment twelve;

[0201] Example 31 : A virtual reality module comprising the vision system of embodiment six and the positioning system of embodiment seven;

[0202] Example 32: A virtual reality module comprising the vision system of embodiment six and the positioning system of embodiment eight;

[0203] Example 33: The virtual reality module includes the visual system of Embodiment Six and the positioning system of Embodiment Nine;

[0204] Example 34: The virtual reality module includes the visual system of Embodiment Six and the positioning system of Embodiment Ten;

[0205] Example 35: The virtual reality module includes the visual system of Embodiment Six and the positioning system of Embodiment Eleven; and

[0206] Example 36: The virtual reality module includes the visual system of Example 6 and the positioning system of Example 12.

[0207] In summary, Table 13 shows the values ​​of the conditional expressions for each of the examples in Examples 1 to 36.

[0208]

[0209]

[0210] Table 13

[0211] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A virtual reality module comprising a vision system and a positioning system, characterized in that, the vision system comprises a first barrel and an optical element group disposed in the first barrel, the optical element group comprises, in order from a first side to a second side along a first optical axis, a first lens, a second lens with positive refractive power, and a third lens with positive refractive power, the second side of the third lens is convex; the optical element group further comprises a reflection assembly, the reflection assembly comprises a reflective polarizing element, a quarter-wave plate, and a partially reflective layer; wherein the number of lenses with refractive power in the vision system is three; the first lens has positive refractive power, the reflective polarizing element is located on the first side of the first lens, the quarter-wave plate is located on the second side of the second lens, and the partially reflective layer is located on the first side of the third lens; or, the first lens has negative refractive power, the reflective polarizing element is located on the second side of the second lens, the quarter-wave plate is located on the second side of the reflective polarizing element, and the partially reflective layer is located on the second side of the third lens; the positioning system comprises a second barrel and a five-piece lens group disposed in the second barrel, the five-piece lens group comprises, in order from an object side to an image side along a second optical axis, a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens, and a fifth lens, the signs of the refractive powers of the fourth lens and the fifth lens are opposite; the object side of the first lens is convex, and the image side is concave; the image side of the second lens is concave; the object side of the fourth lens is convex; the image side of the fifth lens is convex; wherein the number of lenses with refractive power in the positioning system is five; wherein the vision system further comprises a first spacer and a second spacer, the first spacer is disposed on and in contact with the second side of the first lens, and the second spacer is disposed on and in contact with the second side of the second lens; 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 of the first lens, the second positioning member is disposed on and in contact with the image side of the second lens, and the third positioning member is disposed on and in contact with the image side of the third lens. A sum of effective focal lengths F' of the first lens to the third lens, a length L' of the first lens barrel in a direction in which the first optical axis is located, a sum ∑AT' of air intervals of any two adjacent lenses among the first lens to the third lens on the first optical axis, a sum F of effective focal lengths of the first lens piece to the fifth lens piece, a length L of the second lens barrel in a direction in which the second optical axis is located, a sum ∑AT of air intervals of any two adjacent lens pieces among the first lens piece to the fifth lens piece on the second optical axis satisfy: 105.07 ≤ |F'| × (L' / ∑AT') / (F × (L / ∑AT)) ≤ 3500.01; A curvature radius R2' of the second side surface of the first lens, a curvature radius R3' of the first side surface of the second lens, an inner diameter d1m' of the second side surface of the first spacer, and an inner diameter d2s' of the first side surface of the second spacer satisfy: 0.34 ≤ R2' / d1m' - R3' / d2s' ≤ 0.

75. An effective focal length f1 of the first lens piece, an effective focal length f2 of the second lens piece, an effective focal length f3 of the third lens piece, a spacing EP12 of the first positioning member and the second positioning member along the second optical axis, and a spacing EP23 of the second positioning member and the third positioning member along the second optical axis satisfy: 0.56 ≤ |(f1+f2+f3)| / (EP12+EP23) ≤ 1.

15.

2. The virtual reality module of claim 1, wherein, A curvature radius R1' of the first side surface of the first lens, a curvature radius 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 lens barrel and the first spacer along the first optical axis satisfy: 8.31 ≤ d1s' × (R1' / R2') / EP01' ≤ 11.

23.

3. The virtual reality module of claim 1, wherein, A total effective focal length f' of the visual system, a central thickness drp of the reflective polarizing element on the first optical axis, a central thickness dqwp of the quarter-wave plate on the first optical axis, a sum ∑CT' of central thicknesses of the first lens to the third lens on the first optical axis, and a spacing EP01' of the first side end surface of the first lens barrel and the first spacer along the first optical axis satisfy: 1.09 ≤ f' / (EP01' + drp + dqwp + ∑CT') < 1.

5.

4. 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 the first side end surface of the first lens barrel, and an outer diameter D0m' of the second side end surface of the first lens barrel satisfy: 5.05 ≤ |f1' + f3'| / (D0s' + D0m') ≤ 127.

23.

5. The virtual reality module according to any one of claims 1 to 4, characterized in that, 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 member satisfy: -3.61≤d0s / f1+d1m / f2≤-2.76, wherein f1<0 and f2<0.

6. The virtual reality module of any one of claims 1 to 4, 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: 10.17 mm 2 ≤ R2 x (D1m - d1m) + R4 x (D2m - d2m) ≤ 13.51 mm 2 .

7. The virtual reality module of any one of claims 1 to 4, wherein, The effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the central thickness CT2 of the second lens on the second optical axis, the central 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 satisfy: 0.31≤f3×(T23 / CT3) / |f2×(EP23 / CT2)|≤4.

79.

8. The virtual reality module of any one of claims 1 to 4, wherein, The curvature radius R7 of the object side surface of the fourth lens, the curvature radius 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: 0.24≤d3m×R7 / |d0m×R10|≤0.75.

Images