Virtual reality devices

Abstract

This application discloses a virtual reality device, which includes a visual system and a positioning system. The visual system includes a first lens barrel and a first element group, a second element group, a third element group, and a fourth element group arranged sequentially from the first side to the second side along the first optical axis. The first element group includes a reflective polarizing element, a first quarter-wave plate, and a first lens. The second element group includes a second quarter-wave plate and a second lens. The third element group includes a third lens. The fourth element group includes a fourth lens. The positioning system includes a second lens barrel and a five-element lens group arranged in the second lens barrel. The five-element lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side to the image side along the second optical axis. The length L' of the first lens barrel in the direction of the first optical axis, the total effective focal length f' of the visual system, the length L of the second lens barrel in the direction of the second optical axis, and the total effective focal length f of the positioning system satisfy: 3.5 < (L / f) / (L' / f') < 5.5.

Description

Technical Field

[0001] This application relates to the field of optical devices, and more specifically to a virtual reality device. Background Technology

[0002] Virtual reality devices typically include two types of lenses: visual lenses and positioning lenses. Visual lenses immerse the user in the virtual world, while positioning lenses capture images of the surrounding environment and track the user's movements. The combination of visual and positioning lenses connects the real and virtual worlds, enabling interaction and providing an immersive experience. However, these multi-lens virtual reality devices tend to be bulky and heavy, negatively impacting the user experience. Summary of the Invention

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

[0004] One aspect of this application provides a virtual reality device comprising a visual system and a positioning system. The visual system includes a first lens barrel and an optical element group disposed within the first lens barrel. The optical element group, along a first optical axis from a first side to a second side, sequentially includes a first element group, a second element group, a third element group, and a fourth element group. The first element group includes a reflective polarizing element, a first quarter-wave plate, and a first lens. The second element group includes a second quarter-wave plate and a second lens. The third element group includes a third lens. The fourth element group includes a fourth lens. The positioning system includes a second lens barrel and a five-element lens group disposed within the second lens barrel. The five-element lens group, along a second optical axis from the object side to the image side, sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The length L' of the first lens barrel in the direction of the first optical axis, the total effective focal length f' of the visual system, the length L of the second lens barrel in the direction of the second optical axis, and the total effective focal length f of the positioning system satisfy: 3.5 < (L / f) / (L' / f') < 5.5.

[0005] According to an exemplary embodiment of this application, the length L′ of the first lens barrel in the direction of the first optical axis, the maximum field of view FOV' of the visual system, the length L of the second lens barrel in the direction of the second optical axis, and the maximum field of view FOV of the positioning system satisfy: 0.1<(tan(FOV′ / 2)×L') / (tan(FOV / 2)×L)<0.5.

[0006] According to an exemplary embodiment of the present application, the visual system further includes a first spacer disposed on the second side surface of the first lens, a second spacer disposed on the second side surface of the second lens, and a third spacer disposed on the second side surface of the third lens. The positioning system further includes a first positioning member disposed on the image side surface of the first lens, a second positioning member disposed on the image side surface of the second lens, and a third positioning member disposed on the image side surface of the third lens. Wherein, the on-axis distance TD' from the first side surface of the first element group to the second side surface of the fourth element group, the sum ∑EP' of the intervals between any two adjacent spacers among the first spacer to the third spacer along the first optical axis, the on-axis distance TD from the object side surface of the first lens to the image side surface of the fifth lens, and the sum ∑EP of the intervals between any two adjacent positioning members among the first positioning member to the third positioning member along the second optical axis satisfy: 1.0 < (∑EP' / TD') / (∑EP / TD) < 2.5.

[0007] According to an exemplary embodiment of the present application, the inner diameter d0s' of the first side end surface of the first lens barrel, the inner diameter d0m' of the second side end surface of the first lens barrel, the entrance pupil diameter EPD' of the visual system, 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, and the entrance pupil diameter EPD of the positioning system satisfy: 5.0 < ((d0s' - d0m') × EPD') / ((d0s - d0m) × EPD) < 17.0.

[0008] According to an exemplary embodiment of the present application, the inner diameter d0m' of the second side end surface of the first lens barrel and the total effective focal length f' of the visual system satisfy: 1.5 < d0m' / f' < 3.0, and the inner diameter d0m of the image side end surface of the second lens barrel and the total effective focal length f of the positioning system satisfy: 2.0 < d0m / f < 3.0.

[0009] According to an exemplary embodiment of the present application, the visual system further includes a third spacer disposed on the second side surface of the third lens, and the positioning system further includes a third positioning member disposed on the image side surface of the third lens. Wherein, the interval EP30' between the third spacer and the second side end surface of the first lens barrel along the first optical axis, the length L' of the first lens barrel in the direction of the first optical axis, the total effective focal length f' of the visual system, the interval EP30 between the third positioning member and the image side end surface of the second lens barrel along the second optical axis, the length L of the second lens barrel in the direction of the second optical axis, and the total effective focal length f of the positioning system satisfy: 3.0 < (L - EP30 - f) / (L' - EP30' - f') < 7.0.

[0010] According to an exemplary embodiment of this application, the visual system further includes a first spacer disposed on the second side of the first lens, wherein the effective focal length f1' of the first lens, the Abbe number V1' of the first lens, the effective focal length f2' of the second lens, the Abbe number V2' of the second lens, the inner diameter d1s' of the first side of the first spacer, and the inner diameter d1m' of the second side of the first spacer satisfy: -4.0<(f1′+f2′) / ((d1s'-d1m')×(V1'-V2′))<-1.0.

[0011] According to an exemplary embodiment of this application, the visual system further includes a first spacer disposed on a second side surface of the first lens, wherein the radius of curvature R2′ of the second side surface of the first lens, the outer diameter D1s′ of the first side surface of the first spacer, and the outer diameter D0s′ of the first side end face of the first lens barrel satisfy: 7.0 <R2′ / (D1s′-D0s′)<13.0。

[0012] According to an exemplary embodiment of this application, the visual system further includes a first spacer disposed on a second side of the first lens and a second spacer disposed on a second side of the second lens, wherein the effective focal length f1' of the first lens, the effective focal length f2' of the second lens, the maximum thickness CP1' of the first spacer, the spacing EP12' of the first spacer and the second spacer along the first optical axis, and the air spacing T12' of the first element group and the second element group on the first optical axis satisfy: -30.0<(f1'+f2') / (CP1'+EP12'+T12')<-25.0.

[0013] According to an exemplary embodiment of this application, the visual system further includes a first spacer disposed on a second side of a first lens and a second spacer disposed on a second side of a second lens, wherein the radius of curvature R2′ of the second side of the first lens, the radius of curvature R4′ of the second side of the second lens, the outer diameter D1m′ of the second side of the first spacer and the outer diameter D2s′ of the first side of the second spacer satisfy: -3.0<(R2′+R4′) / D1m′+(R2′-R4′) / D2s′<-1.0.

[0014] According to an exemplary embodiment of this application, the visual system further includes a second spacer disposed on a second side of the second lens and a third spacer disposed on a second side of the third lens, wherein the refractive index N3′ of the third lens, the refractive index N4′ of the fourth lens, the effective focal length f3′ of the third lens, the spacing EP23′ of the second spacer and the third spacer along the first optical axis and the maximum thickness CP3′ of the third spacer satisfy: -4.0<(N3′-N4′)×f3′ / (EP23′+CP3′)<-2.0.

[0015] According to an exemplary embodiment of this application, the visual system further includes a second spacer disposed on a second side of the second lens and a third spacer disposed on a second side of the third lens, wherein the radius of curvature R6' of the second side of the third lens, the radius of curvature R7' of the first side of the fourth lens, the center thickness CT3' of the third lens on the first optical axis, the center thickness CT4' of the fourth lens on the first optical axis, the spacing EP23' of the second spacer and the third spacer along the first optical axis and the spacing EP30' of the second side end face of the third spacer and the first lens barrel along the first optical axis satisfy: -8.5<(R6'-R7') / (CT3'+CT4'+EP23'+EP30')<-4.5.

[0016] According to an exemplary embodiment of this application, the visual system further includes a third spacer disposed on the second side of the third lens, wherein the radius of curvature R5' of the first side of the third lens, the Abbe number V3' of the third lens, the Abbe number V4' of the fourth lens, the inner diameter d3m' of the second side of the third spacer, and the outer diameter D3m' of the second side of the third spacer satisfy: 0 <R5' / ((V3'+V4')×(d3m'+D3m'))<10.0。

[0017] According to an exemplary embodiment of this application, the axial distance TD from the object-side surface of the first lens to the image-side surface of the fifth lens, the outer diameter D0s of the object-side end face of the second lens barrel, and the outer diameter D0m of the image-side end face of the second lens barrel satisfy: 1.0 <TD / (D0s-D0m)<2.5。

[0018] According to an exemplary embodiment of this application, the positioning system further includes a first positioning member disposed on the image side of the first lens, wherein the radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, the refractive index N1 of the first lens, the inner diameter d1s of the object side of the first positioning member and the outer diameter D1s of the object side of the first positioning member satisfy: 1.0 < (R1-R2)×N1 / (D1s-d1s) < 3.0.

[0019] According to an exemplary embodiment of the present application, the positioning system further includes a first positioning member disposed on the image side of the first lens and a second positioning member disposed on the image side of the second lens. Wherein, the total effective focal length f of the positioning system and the effective focal length f1 of the first lens satisfy: -6.0 < f1 / f < 0, and the total effective focal length f of the positioning system and the effective focal length f2 of the second lens satisfy: -6.0 < f2 / f < 0. The total effective focal length f of the positioning system, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the object-side end face of the second lens barrel, and the interval EP01 between the first positioning member along the second optical axis and the interval EP12 between the first positioning member and the second positioning member along the second optical axis satisfy: -3.0 < (f1 - f2) / EP12 - f / EP01 < 3.5.

[0020] According to an exemplary embodiment of the present application, the positioning system further includes a first positioning member disposed on the image side of the first lens and a second positioning member disposed on the image side of the second lens. Wherein, the radius of curvature R2 of the image side of the first lens, the Abbe number V1 of the first lens, the radius of curvature R3 of the object side of the second lens, the Abbe number V2 of the second lens, and the interval EP12 between the first positioning member and the second positioning member along the second optical axis satisfy: -15.0 < (V1 / R2 - V2 / R3)×EP12 < 40.0.

[0021] According to an exemplary embodiment of the present application, the positioning system further includes a second positioning member disposed on the image side of the second lens and a third positioning member disposed on the image side of the third lens. Wherein, the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, the inner diameter d2s of the object side of the second positioning member, the outer diameter D2s of the object side of the second positioning member, the inner diameter d3s of the object side of the third positioning member, and the outer diameter D3s of the object side of the third positioning member satisfy: -6.5 < (D2s + d2s) / R5 + (D3s + d3s) / R6 < 2.5.

[0022] According to an exemplary embodiment of the present application, the positioning system further includes a third positioning member disposed on the image side of the third lens. Wherein, the total effective focal length f of the positioning system, the combined focal length f45 of the fourth lens and the fifth lens, the radius of curvature R8 of the image side of the fourth lens, and the outer diameter D3m of the image side of the third positioning member satisfy: 0 < (f45 - f) / (D3m - R8) < 5.0.

[0023] The virtual reality device provided in this application is configured as a combination of a visual system and a positioning system. By controlling the relationship between the length of the first lens barrel along the first optical axis, the total effective focal length of the visual system, the length of the second lens barrel along the second optical axis, and the total effective focal length of the positioning system, the shape of each lens in the visual system and the stacking distance of the lenses can be constrained. This ensures that the visual system has a suitable reflection length, which is beneficial for reducing the size of the display of the visual system. At the same time, it can also reduce the length of the positioning system, reduce the space ratio of the visual system and the positioning system in the entire virtual reality device, and help to compress the length of the virtual reality device and reduce its weight. Through the design optimization of the visual system and the positioning system, this application, on the one hand, rationally configures the structure and matching space of the visual system and the positioning system, reducing the weight and size of the entire virtual reality device; on the other hand, it allows the real scene captured by the positioning system to be projected more reasonably into the virtual world, improving the user experience. Attached Figure Description

[0024] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. In the drawings:

[0025] Figure 1 A plan view of a virtual reality device according to this application is shown;

[0026] Figure 2 A front view of a virtual reality device according to this application is shown;

[0027] Figure 3 A rear view of the virtual reality device according to this application is shown;

[0028] Figure 4 A schematic diagram of the parameters of the visual system according to this application is shown;

[0029] Figure 5 A schematic diagram of the parameters of the positioning system according to this application is shown;

[0030] Figure 6 A schematic diagram of the structure of the visual system according to Embodiment 1 of this application is shown;

[0031] Figure 7 A schematic diagram of the visual system according to Embodiment 2 of this application is shown;

[0032] Figure 8 A schematic diagram of the visual system according to Embodiment 3 of this application is shown;

[0033] Figures 9A to 9CThe on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the visual systems according to Embodiments 1, 2, and 3 of this application are shown respectively.

[0034] Figure 10 A schematic diagram of the visual system according to Embodiment 4 of this application is shown;

[0035] Figure 11 A schematic diagram of the visual system according to Embodiment 5 of this application is shown;

[0036] Figure 12 A schematic diagram of the visual system according to Embodiment Six of this application is shown;

[0037] Figures 13A to 13C The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the visual systems according to embodiments four, five, and six of this application are shown respectively.

[0038] Figure 14 A schematic diagram of the positioning system according to Embodiment 7 of this application is shown;

[0039] Figure 15 A schematic diagram of the positioning system according to Embodiment 8 of this application is shown;

[0040] Figures 16A to 16C The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the positioning systems according to embodiments seven and eight of this application are shown respectively.

[0041] Figure 17 A schematic diagram of the positioning system according to Embodiment 9 of this application is shown;

[0042] Figure 18 A schematic diagram of the positioning system according to Embodiment 10 of this application is shown;

[0043] Figures 19A to 19C The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the positioning systems according to embodiments nine and ten of this application are shown respectively.

[0044] Figure 20 A schematic diagram of the positioning system according to Embodiment Eleven of this application is shown;

[0045] Figure 21 A schematic diagram of the positioning system according to Embodiment Twelve of this application is shown; and

[0046] Figures 22A to 22C The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the positioning systems according to embodiments eleven and twelve of this application are shown respectively. Detailed Implementation

[0047] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0048] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0049] In the accompanying drawings, for ease of illustration, the thickness, size, and shape of the lenses and / or mirrors have been slightly exaggerated. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0050] In this document, the paraxial region refers to the region near the optical axis. If the lens and / or lens surface is convex and the location of the convexity is not defined, it means 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 location of the concaveness is not defined, it means that the lens and / or lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side (e.g., the human eye side) is called the first side surface of the lens, and the surface of each lens closest to the second side (e.g., the display side) is called the second side surface of the lens. The surface of each lens closest to the object being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging plane is called the image side surface of the lens.

[0051] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising" as used in this specification indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0052] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0053] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] The features, principles and other aspects of this application are described in detail below.

[0055] refer to Figures 1 to 3 The first aspect of this application provides a virtual reality device that may include a visual system and a positioning system. The positioning system is used to capture the user's body movements, and the resulting real-world image is transmitted to the visual system via electrical signals. The visual system is used to project a virtual image onto a display screen. The number of visual systems and the number of positioning systems may be one or more. In one example, the virtual reality device may include two symmetrically arranged visual systems. It should be understood that the virtual reality device may also include any one or more optical systems other than the visual system and the positioning system; this application does not specifically limit this.

[0056] The visual system in this application transmits virtual images from the display to the user's eyes, providing a sense of virtual immersion. The positioning system collects position data of the controllers in the user's hands and transmits this data to the display of the visual system via its chip. The visual system then transmits the controller position data from the display to the user to help them determine the position of their hands on the screen. The virtual reality device provided in this application combines the immersive experience of the visual system with the positioning function of the positioning system, breaking through the spatial limitations of virtual reality devices and enabling interaction between the real and virtual worlds.

[0057] In an exemplary embodiment, the visual system may include a first lens barrel and an optical element group disposed within the first lens barrel. The optical element group sequentially includes a first element group, a second element group, a third element group, and a fourth element group along a first optical axis from a first side to a second side. The first element group may, for example, include a reflective polarizing element, a first quarter-wave plate, and a first lens. The second element group may, for example, include a second quarter-wave plate and a second lens. The third element group may, for example, include a third lens. The fourth element group may, for example, include a fourth lens. There may be an air gap between adjacent element groups from the first to the fourth element groups. In one example, the first element group may have positive optical power. The second element group may have negative optical power. The third element group may have positive optical power. The fourth element group may have positive optical power.

[0058] In an exemplary embodiment, the visual system may include a group of spacers disposed within a first lens barrel. The group of spacers may include one or more of a first spacer, a second spacer, and a third spacer. Specifically, the first spacer may be disposed on and at least partially in contact with a second side of the first lens; the second spacer may be disposed on and at least partially in contact with a second side of the second lens; and the third spacer may be disposed on and at least partially in contact with a second side of the third lens. Proper use of spacers can effectively mitigate stray light risks, reduce interference with image quality, and thus improve the imaging quality of the visual system.

[0059] In an exemplary embodiment, the first side may be the human eye side, and the second side may be the display side. Accordingly, the first side of each element (first lens, second lens, third lens, fourth lens, reflective polarizing element, first quarter-wave plate, second quarter-wave plate) may be referred to as the side near the human eye, and the second side may be referred to as the side near the display.

[0060] In an exemplary embodiment, the first side surface of the first lens is configured as a plane, and a reflective polarizing element is bonded to a first quarter-wave plate to form a film layer. The bonded film layer is attached to the first side surface of the first lens, wherein the reflective polarizing element is located on the first side surface of the first quarter-wave plate. By combining the reflective polarizing element and the first quarter-wave plate to form a film layer, the number of bonding surfaces of the film layer can be reduced, improving the bonding yield of the film layer. Furthermore, the bonded film layer is attached to a plane, which helps to improve the stability of the film layer after bonding, thereby improving the performance of the visual system.

[0061] In an exemplary embodiment, the visual system may further include a partially reflective layer, which may be attached, for example, to the second side surface of the first lens. The partially reflective layer has a semi-transmissive and semi-reflective effect on light. By providing a partially reflective layer on the second side surface of the first lens, and combining it with a reflective polarizing element and a first quarter-wave plate on the first side surface of the first lens, light can be refracted multiple times, effectively reducing the overall length of the visual system.

[0062] In an exemplary embodiment, the visual system may further include an aperture stop, which may be disposed, for example, between the first side and the first lens. The image light on the display is finally projected to the user's eyes after being refracted and reflected multiple times by a fourth lens, a third lens, a second lens, a second quarter-wave plate, a first lens, a first quarter-wave plate, and a reflective polarizing element.

[0063] In an exemplary embodiment, image light from the display sequentially passes through a fourth lens, a third lens, a second lens, a second quarter-wave plate, a first lens, and a first quarter-wave plate to reach a reflective polarizing element, where it is reflected to form a first reflected image light. The first reflected image light passes through the first quarter-wave plate and the first lens to reach a partial reflective layer, where it is reflected again to form a second reflected image light. The second reflected image light then sequentially passes through the first lens, the first quarter-wave plate, and the reflective polarizing element to the aperture stop and is finally projected into the user's eye. The viewing system provided in this application effectively shortens the overall length of the viewing system by folding the required optical path through a combination of light reflection and refraction without affecting projection quality.

[0064] In an exemplary embodiment, the positioning system may include a second lens barrel and a five-lens assembly disposed within the second lens barrel. The five-lens assembly includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side to the image side along a second optical axis. Air gaps may exist between adjacent lenses from the first to the fifth lens. In one example, the first lens may have negative optical power. The second lens may have negative optical power. The third lens may have positive optical power. The fourth lens may have either positive or negative optical power. The fifth lens may have either positive or negative optical power. By configuring the positioning system in a five-lens configuration, the positioning system can have a relatively small total effective focal length while maintaining a certain effective image plane, thereby ensuring a large field of view and facilitating the positioning system in capturing the position and orientation of the handle in the user's hand.

[0065] In an exemplary embodiment, the positioning system may include a group of positioning components disposed within a second lens barrel. This group may include one or more of a first positioning component, a second positioning component, and a third positioning component. Specifically, the first positioning component may be positioned on the image-side surface of the first lens and at least partially in contact with it; the second positioning component may be positioned on the image-side surface of the second lens and at least partially in contact with it; and the third positioning component may be positioned on the image-side surface of the third lens and at least partially in contact with it. Proper use of the positioning components can effectively mitigate stray light risks, reduce interference with image quality, and thus improve the imaging quality of the positioning system.

[0066] In an exemplary embodiment, the length L' of the first lens barrel along the first optical axis, the total effective focal length f' of the visual system, the length L of the second lens barrel along the second optical axis, and the total effective focal length f of the positioning system can satisfy: 3.5 < (L / f) / (L' / f') < 5.5. By controlling the above conditional expression, the shape of each lens in the visual system and the stacking distance of the lenses can be constrained, thereby ensuring that the visual system has a suitable reflection length, which is beneficial to reducing the size of the display of the visual system; at the same time, it can also reduce the length of the positioning system, reduce the space ratio of the visual system and the positioning system in the entire virtual reality device, and help to compress the length of the virtual reality device and reduce its own weight. By designing and optimizing the visual system and the positioning system, on the one hand, the structure and matching space of the visual system and the positioning system are reasonably configured, reducing the weight and size of the entire virtual reality device; on the other hand, the real scene captured by the positioning system is more reasonably projected into the virtual world, improving the user experience.

[0067] In an exemplary embodiment, the length L' of the first lens barrel along the first optical axis, the maximum field of view (FOV)' of the visual system, the length L of the second lens barrel along the second optical axis, and the maximum field of view (FOV) of the positioning system can satisfy: 0.1 < (tan(FOV' / 2) × L') / (tan(FOV / 2) × L) < 0.5. By controlling the above conditional expression, the overall size of the virtual reality device can be constrained, and the amount of light entering the device can be increased, enhancing the user's immersion; at the same time, the imaging quality of the visual system and the positioning system can be ensured.

[0068] In an exemplary embodiment, the axial distance TD′ between the first side of the first element group and the second side of the fourth element group, the sum of the intervals ∑EP′ between any two adjacent spacers from the first spacer to the third spacer along the first optical axis, the axial distance TD between the object side of the first lens and the image side of the fifth lens, and the sum of the intervals ∑EP between any two adjacent positioning members from the first positioning member to the third positioning member along the second optical axis can satisfy: 1.0 < (∑EP′ / TD′) / (∑EP / TD) < 2.5. By controlling the above conditional expressions, the body length of the visual system and the positioning system can be constrained, making the external proportions of the visual system and the positioning system reasonable, and the lens and / or lens and lens barrel structure reasonable, thereby realizing the miniaturization and portability of the virtual reality device.

[0069] In an exemplary embodiment, the inner diameter d0s′ of the first side end face of the first lens barrel, the inner diameter d0m′ of the second side end face of the first lens barrel, the entrance pupil diameter EPD' of the visual system, 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, and the entrance pupil diameter EPD of the positioning system may satisfy: 5.0 < ((d0s′ - d0m′) × EPD′) / ((d0s - d0m) × EPD) < 17.0. By controlling the above conditional expression, it is possible to make the visual system and the positioning system have reasonable overall diameters and entrance pupil diameters, and avoid the problem of stray light interference during the imaging of the virtual reality device, thereby improving the imaging quality of the virtual reality device.

[0070] In an exemplary embodiment, the inner diameter d0m′ of the second side end face of the first lens barrel and the total effective focal length f′ of the visual system may satisfy: 1.5 < d0m′ / f′ < 3.0, and the inner diameter d0m of the image side end face of the second lens barrel and the total effective focal length f of the positioning system may satisfy: 2.0 < d0m / f < 3.0. By controlling the above conditional expressions, it is possible to constrain the shapes of the lenses in the visual system and the stacking distances of the lenses, ensure that the visual system has an appropriate catadioptric length, which is beneficial to reducing the size of the display of the visual system; at the same time, it can also reduce the width of the visual system and the positioning system in the direction perpendicular to their respective optical axes, which helps to compress the width of the virtual reality device and reduce the self-weight of the virtual reality device.

[0071] In an exemplary embodiment, the interval EP30′ between the third spacer and the second side end face of the first lens barrel along the first optical axis, the length L′ of the first lens barrel in the direction of the first optical axis, the total effective focal length f′ of the visual system, the interval EP30 between the third positioning member and the image side end face of the second lens barrel along the second optical axis, the length L of the second lens barrel in the direction of the second optical axis, and the total effective focal length f of the positioning system may satisfy: 3.0 < (L - EP30 - f) / (L′ - EP30′ - f′) < 7.0. By controlling the above conditional expression, it is possible to constrain the shapes of the lenses in the visual system and the stacking distances of the lenses, ensure that the visual system has an appropriate catadioptric length, which is beneficial to reducing the size of the display of the visual system; at the same time, it can also reduce the length of the positioning system, which helps to compress the length of the virtual reality device and reduce the self-weight of the virtual reality device.

[0072] In an exemplary embodiment, the effective focal length f1' of the first lens, the Abbe number V1' of the first lens, the effective focal length f2' of the second lens, the Abbe number V2' of the second lens, the inner diameter d1s' of the first side surface of the first spacer and the inner diameter d1m' of the second side surface of the first spacer may satisfy: -4.0 < (f1' + f2') / ((d1s' - d1m') × (V1' - V2')) < -1.0. By controlling the above conditional expression, the first lens and the second lens can have reasonable central thicknesses, which is beneficial to improving the overall uniformity of these two lenses, ensuring the molding of these two lenses, and with reasonable Abbe numbers of the first lens and the second lens, which is beneficial to improving the imaging quality of the visual system; at the same time, it can also make the light refract greatly at the first lens and the second lens, reducing the stray light risk at the positions of the first lens and the second lens, and further reducing the influence of the first lens and the second lens on the imaging quality of the visual system.

[0073] In an exemplary embodiment, the curvature radius R2' of the second side surface of the first lens, the outer diameter D1s' of the first side surface of the first spacer and the outer diameter D0s' of the first side end surface of the first lens barrel may satisfy: 7.0 < R2' / (D1s' - D0s') < 13.0. By controlling the above conditional expression, the shape of the second side surface of the first lens can be constrained, which is beneficial to reducing the sensitivity of the first lens and improving the yield of the visual system; at the same time, it can also make the outer diameter of the first side surface of the first spacer and the outer diameter of the first side end surface of the first lens barrel within a reasonable range, improving the uniformity and machinability of the first lens and the first lens barrel.

[0074] In an exemplary embodiment, the effective focal length f1' of the first lens, the effective focal length f2' of the second lens, the maximum thickness CP1' of the first spacer, the interval EP12' between the first spacer and the second spacer along the first optical axis, and the air interval T12' between the first element group and the second element group on the first optical axis may satisfy: -30.0 < (f1' + f2') / (CP1' + EP12' + T12') < -25.0. By controlling the above conditional expression, the mechanical diameter edge thickness and the effective diameter thickness of the first lens and the second lens can be made to be quite equivalent, which is beneficial to improving the thickness uniformity of the first lens and the second lens and controlling the thickness ratio of the first lens and the second lens in the best molding state; at the same time, it can also constrain the maximum thickness of the first spacer, the interval between the first spacer and the second spacer along the first optical axis, and the air interval between the first element group and the second element group on the first optical axis, which is beneficial to reasonably allocate the size layout of the visual system and improve the assembly stability of the visual system.

[0075] In an exemplary embodiment, the radius of curvature R2′ of the second side surface of the first lens, the radius of curvature R4′ of the second side surface of the second lens, the outer diameter D1m′ of the second side surface of the first spacer, and the outer diameter D2s′ of the first side surface of the second spacer can satisfy: -3.0 < (R2′ + R4′) / D1m′ + (R2′ - R4′) / D2s′ < -1.0. By controlling the above conditional expression, the shapes of the second side surfaces of the first and second lenses can be constrained, which helps to reduce the sensitivity of the first and second lenses and improve the yield of the visual system; at the same time, it can also ensure the uniformity and manufacturability of the first and second lenses.

[0076] In an exemplary embodiment, the refractive index N3′ of the third lens, the refractive index N4′ of the fourth lens, the effective focal length f3′ of the third lens, the spacing EP23′ of the second and third spacers along the first optical axis, and the maximum thickness CP3′ of the third spacer can satisfy: -4.0 < (N3′ - N4′) × f3′ / (EP23′ + CP3′) < -2.0. By controlling the above conditional expression, the direction of light passing through the third and fourth lenses can be controlled, ensuring the manufacturability of the third and fourth lenses; at the same time, the spacing of the second and third spacers along the first optical axis and the maximum thickness of the third spacer can also be constrained, so that the third lens and the second and third spacers all have a certain bearing area, improving the assembly stability of the visual system. In addition, it can also block excess light and prevent stray light from being generated at the above-mentioned positions.

[0077] In an exemplary embodiment, the radius of curvature R6′ of the second side surface of the third lens, the radius of curvature R7′ of the first side surface of the fourth lens, the center thickness CT3′ of the third lens on the first optical axis, the center thickness CT4′ of the fourth lens on the first optical axis, the spacing EP23′ between the second and third spacers along the first optical axis, and the spacing EP30′ between the second side end face of the third spacer and the first lens barrel along the first optical axis can satisfy: -8.5<(R6′-R7′) / (CT3′+CT4′+EP23′+EP30′)<-4.5. By controlling the above-mentioned conditional expressions, the radii of curvature of the second side surface of the third lens and the first side surface of the fourth lens can be constrained. This helps to reduce the sensitivity of the third and fourth lenses while ensuring their uniformity and manufacturability, thereby improving the assembly yield of the visual system. At the same time, it also helps to constrain the center thickness of the third lens on the first optical axis, the center thickness of the fourth lens on the first optical axis, the spacing between the second and third spacers along the first optical axis, and the spacing between the third spacer and the second side end face of the first lens barrel along the first optical axis. This helps to compress the overall size of the visual system and realize the miniaturization of the virtual reality device.

[0078] In an exemplary embodiment, the radius of curvature R5′ of the first side surface of the third lens, the Abbe number V3′ of the third lens, the Abbe number V4′ of the fourth lens, the inner diameter d3m′ of the second side surface of the third spacer and the outer diameter D3m′ of the second side surface of the third spacer may satisfy: 0 < R5′ / ((V3′ + V4′)×(d3m′ + D3m')) < 10.0. By controlling the above conditional expression, the radius of curvature of the first side surface of the third lens can be constrained, so that light rays are refracted greatly at the third lens, which is beneficial to reducing the diameter of the third lens. Moreover, with reasonable inner and outer diameters of the second side surface of the third spacer, it is beneficial to reduce the influence of the position where the third lens is located on the outer dimensions of the visual system, ensuring that the size of the visual system is as small as possible. At the same time, the Abbe numbers of the third lens and the fourth lens can be reasonably allocated, reducing the chromatic aberration of the third lens and the fourth lens and improving the imaging quality of the visual system.

[0079] In an exemplary embodiment, the axial distance TD from the object side surface of the first lens to the image side surface of the fifth lens, the outer diameter D0s of the object side end surface of the second lens barrel and the outer diameter D0m of the image side end surface of the second lens barrel may satisfy: 1.0 < TD / (D0s - D0m) < 2.5. By controlling the above conditional expression, the outer shape ratio of the positioning system can be made reasonable, and the structure of the lens and the second lens barrel can be made more reasonable, which is beneficial to the miniaturization of the virtual reality device.

[0080] In an exemplary embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the refractive index N1 of the first lens, the inner diameter d1s of the object side surface of the first positioning member and the outer diameter D1s of the object side surface of the first positioning member may satisfy: 1.0 < (R1 - R2)×N1 / (D1s - d1s) < 3.0. By controlling the above conditional expression, the radii of curvature of the object side surface and the image side surface of the first lens and the refractive index can be constrained, so that light rays are refracted greatly at the first lens, which is beneficial to reducing the diameter of the first lens, thereby ensuring the size of the positioning system. At the same time, the inner and outer diameters of the object side surface of the first positioning member can be within a reasonable range, ensuring that the outer diameter of the first lens is not too large or too small, improving the overall uniformity of the first lens, and being beneficial to the molding of the first lens.

[0081] In an exemplary embodiment, the total effective focal length f of the positioning system and the effective focal length f1 of the first lens may satisfy: -6.0 < f1 / f < 0, the total effective focal length f of the positioning system and the effective focal length f2 of the second lens may satisfy: -6.0 < f2 / f < 0, and the total effective focal length f of the positioning system, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the object-side end face of the second lens barrel, and the interval EP01 between the first positioning member along the second optical axis and the interval EP12 between the first positioning member and the second positioning member along the second optical axis satisfy: -3.0 < (f1 - f2) / EP12 - f / EP01 < 3.5. By controlling the above conditional expressions, the optical powers of the first lens and the second lens can be reasonably distributed, which is beneficial to restricting the light path and ensuring the sizes and processability of the first lens and the second lens; at the same time, the interval between the object-side end face of the second lens barrel and the first positioning member along the second optical axis and the interval between the first positioning member and the second positioning member along the second optical axis can also be restricted, so that the second lens has a certain bearing area with the first positioning member and the second positioning member, improving the assembly stability of the positioning system. In addition, the length and overall size of the positioning system can be reduced.

[0082] In an exemplary embodiment, the radius of curvature R2 of the image-side surface of the first lens, the Abbe number V1 of the first lens, the radius of curvature R3 of the object-side surface of the second lens, the Abbe number V2 of the second lens, and the interval EP12 between the first positioning member and the second positioning member along the second optical axis may satisfy: -15.0 < (V1 / R2 - V2 / R3) × EP12 < 40.0. By controlling the above conditional expressions, the Abbe numbers of the first lens, the second lens, and the third lens can be reasonably distributed, reducing the influence of the first lens, the second lens, and the third lens on the imaging quality of the positioning system; at the same time, the edge thickness of the second lens can also be restricted, improving the overall uniformity of the first lens and the second lens and being beneficial to the forming of the first lens and the second lens.

[0083] In an exemplary embodiment, the radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R6 of the image-side surface of the third lens, the inner diameter d2s of the object-side surface of the second positioning member, the outer diameter D2s of the object-side surface of the second positioning member, the inner diameter d3s of the object-side surface of the third positioning member, and the outer diameter D3s of the object-side surface of the third positioning member may satisfy: -6.5 < (D2s + d2s) / R5 + (D3s + d3s) / R6 < 2.5. By controlling the above conditional expressions, the surface shapes of the object-side surface and the image-side surface of the third lens can be restricted, improving the uniformity and processability of the third lens; at the same time, the inner and outer diameters of the object-side surfaces of the second positioning member and the third positioning member can also be restricted, ensuring reasonable radial dimensions at the position where the third lens is located, being beneficial to a reasonable shape ratio of the positioning system, and achieving miniaturization and portability of the virtual reality device.

[0084] In an exemplary embodiment, the total effective focal length f of the positioning system, the combined focal length f45 of the fourth and fifth lenses, the radius of curvature R8 of the image-side surface of the fourth lens, and the outer diameter D3m of the image-side surface of the third positioning component can satisfy: 0 < (f45 - f) / (D3m - R8) < 5.0. By controlling the above conditional expression, the combined focal length of the fourth and fifth lenses can be kept within a reasonable range, which is beneficial for balancing the aberrations generated by the fourth and fifth lenses on the front-end lens and ensuring that the overall aberration of the positioning system is at a reasonable level. At the same time, it can also constrain the outer diameter of the image-side surface of the third positioning component, improve the manufacturability of the third positioning component, and ensure that the third positioning component has good support for the fourth lens.

[0085] The virtual reality device according to the above embodiments of this application comprises a visual system and a positioning system. The visual system may employ multiple lenses, such as the four lenses described above, and the positioning system may employ multiple lenses, such as the five lenses described above. By rationally configuring the parameters of the visual system and the positioning system, the imaging quality and visual immersion of the virtual reality device can be improved. Furthermore, the virtual reality device configured as described above features miniaturization and good imaging quality, effectively meeting the usage needs of various portable electronic products in projection scenarios.

[0086] In embodiments of this application, at least one surface of each of the first to fourth lenses is an aspherical surface. At least one surface of each of the first to fifth lenses is an aspherical surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0087] 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.

[0088] refer to Figures 1 to 3A second aspect of this application provides a virtual reality device comprising a viewing system and a positioning system. The viewing system includes a first lens barrel and an optical element group disposed within the first lens barrel. The optical element group, along a first optical axis from a first side to a second side, sequentially includes a first element group, a second element group, a third element group, and a fourth element group. The first element group includes a reflective polarizing element, a first quarter-wave plate, and a first lens. The second element group includes a second quarter-wave plate and a second lens. The third element group includes a third lens, and the fourth element group includes a fourth lens. The positioning system includes a second lens barrel and a five-element lens group disposed within the second lens barrel. The five-element lens group, along a second optical axis from the object side to the image side, sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens.

[0089] Specifically, the length L' of the first lens barrel along the first optical axis, the maximum field of view (FOV)' of the visual system, the length L of the second lens barrel along the second optical axis, and the maximum field of view (FOV) of the positioning system can satisfy: 0.1 < (tan(FOV' / 2) × L') / (tan(FOV / 2) × L) < 0.5. By controlling the above conditional expression, the overall size of the virtual reality device can be constrained, and the amount of light entering the device can be increased to enhance the user's immersion; at the same time, the imaging quality of the visual system and the positioning system can be ensured.

[0090] refer to Figures 1 to 3 A third aspect of this application provides a virtual reality device comprising a viewing system and a positioning system. The viewing system includes a first lens barrel and an optical element group disposed within the first lens barrel. The optical element group, along a first optical axis from a first side to a second side, sequentially includes a first element group, a second element group, a third element group, and a fourth element group. The first element group includes a reflective polarizing element, a first quarter-wave plate, and a first lens. The second element group includes a second quarter-wave plate and a second lens. The third element group includes a third lens, and the fourth element group includes a fourth lens. The positioning system includes a second lens barrel and a five-element lens group disposed within the second lens barrel. The five-element lens group, along a second optical axis from the object side to the image side, sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens.

[0091] Specifically, the inner diameters d0s' of the first side end face of the first lens tube, d0m' of the second side end face of the first lens tube, the entrance pupil diameter EPD' of the visual system, the inner diameters d0s and d0m of the object-side end face of the second lens tube, and the entrance pupil diameter EPD of the positioning system can satisfy: 5.0 < ((d0s'-d0m')×EPD') / ((d0s-d0m)×EPD) < 17.0. By controlling the above conditional expression, the visual system and the positioning system can have reasonable overall diameters and entrance pupil diameters, and the problem of stray light interference during imaging of the virtual reality device can be avoided, thereby improving the imaging quality of the virtual reality device.

[0092] Specific embodiments of the visual system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0093] Example 1

[0094] The following is for reference Figure 6 A visual system according to Embodiment 1 of this application is described.

[0095] 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 element group, a second element group, a third element group, and a fourth element group arranged sequentially from a first side to a second side along a first optical axis. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. In other examples, the first element group also includes a partially reflective layer BS (not shown). The second element group includes a second quarter-wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. The spacer group includes a first spacer P1', a second spacer P2', and a third spacer P3'. In this embodiment, the first side refers to the human eye side, and the second side refers to the display side. The first side of each component (first lens E1′, second lens E2′, third lens E3′, fourth lens E4′, reflective polarizing element RP, first quarter-wave plate QWP1 and second quarter-wave plate QWP2) is referred to as the side closest to the human eye, and the second side is referred to as the side closest to the display.

[0096] The first lens E1' has positive optical power. Its side near the human eye (S3) is flat, and its side near the display (S4) is convex, with a partial reflective layer (BS) attached. The reflective polarizing element RP has a side near the human eye (S1) and a side near the display. The first quarter-wave plate QWP1 has a side near the human eye (S2) and a side near the display. The side near the display of the reflective polarizing element RP is attached to the side near the human eye (S2) of the first quarter-wave plate QWP1, and the side near the display of the first quarter-wave plate QWP1 is attached to the side near the human eye (S3) of the first lens E1'. The second lens E2' has negative optical power. Its side near the human eye (S6) is flat, and its side near the display (S7) is concave. The second quarter-wave plate QWP2 has a side near the human eye (S5) and a side near the display. Its side near the display is attached to the side near the human eye (S6) of the second lens E2. The third lens E3' has positive optical power. Its side near the human eye (S8) is convex, and its side near the display (S9) is convex. The fourth lens E4' has positive optical power, and its side S10 near the human eye is convex, while its side S11 near the display screen is convex.

[0097] In this example, the second side of the visual system 100 may be provided with an image surface S14. The image surface S14 may, for example, be provided with a fifth element group. The fifth element group may include a display and a third quarter-wave plate QWP3. The third quarter-wave plate QWP3 has a near-eye side S12 and a near-display side, with its near-display side attached to the near-eye side S13 of the display. Image light from the display passes sequentially through the fourth lens E4', the third lens E3', the second lens E2', the second quarter-wave plate QWP2, the first lens E1', and the first quarter-wave plate QWP1, and reaches the reflective polarizing element RP, where it undergoes a first reflection. The light after the first reflection passes through the first quarter-wave plate QWP1 and the first lens E1', and reaches the partial reflective layer BS, where it undergoes a second reflection. The light after the second reflection passes sequentially through the first lens E1', the first quarter-wave plate QWP1, and the reflective polarizing element RP, and is finally projected onto a target object (not shown) in space. For example, the light from the visual system 100, after being reflected twice, is finally projected into the user's eyes.

[0098] Table 1 shows the basic parameters of the visual system in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm). Image light from the display passes through each element in the order of number 20 to number 2 and is finally projected into the human eye.

[0099]

[0100]

[0101] Table 1

[0102] In this embodiment, the effective focal length f1' of the first lens is 12.85mm, the effective focal length f2' of the second lens is -189.57mm, the effective focal length f3' of the third lens is 69.02mm, the effective focal length f4' of the fourth lens is 13.72mm, the total effective focal length f' of the visual system is 11.42mm, the maximum field of view FOV' of the visual system is 86.0°, and the entrance pupil diameter EPD' of the visual system is 4.00mm.

[0103] In this embodiment, the near-display side S4 of the first lens E1', the near-display side S7 of the second lens E2', the near-eye side S8 and the near-display side S9 of the third lens E3', and the near-eye side S10 and the near-display side S11 of the fourth lens E4' are all aspherical. The surface shape x of each aspherical lens can be limited by, but is not limited to, the following aspherical formula:

[0104]

[0105] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; 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 i-th order correction coefficient of the aspherical surface. Table 2 gives the higher-order coefficients A4, A6, A8, A11 that can be used for each aspherical mirror S4, S7-S11 in Example 1. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0106]

[0107]

[0108] Table 2

[0109] Example 2

[0110] The following is for reference Figure 7 A visual system according to Embodiment 2 of this application is described.

[0111] like Figure 7As 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 element group, a second element group, a third element group, and a fourth element group arranged sequentially from a first side to a second side along a first optical axis. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1′. In other examples, the first element group also includes a partially reflective layer BS (not shown). The second element group includes a second quarter-wave plate QWP2 and a second lens E2′. The third element group includes a third lens E3′. The fourth element group includes a fourth lens E4′. The spacer group includes a first spacer P1′, a second spacer P2′, and a third spacer P3′.

[0112] The structure of the optical element group in this embodiment is the same as that in Embodiment 1. That is, the basic parameter table of the visual system in this embodiment is the same as Table 1, and the aspherical coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 is that the structural dimensions of the first lens barrel P0′, the first spacer P1′, the second spacer P2′, and the third spacer P3′ are different. For example, the parameters such as 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 outer diameter D1s′ of the first side of the first spacer, the outer diameter D1m′ of the second side of the first spacer, the outer diameter D2s′ of the first side of the second spacer, the inner diameter d3m′ of the second side of the third spacer, the outer diameter D3m′ of the second side of the third spacer, the inner diameter d0s′ of the first end face of the first lens barrel, the inner diameter d0m′ of the second end face of the first lens barrel, the outer diameter D0s′ of the first end face of the first lens barrel, the maximum thickness CP1′ of the first spacer, the spacing EP12′ between the first and second spacers along the first optical axis, the spacing EP23′ between the second and third spacers along the first optical axis, the maximum thickness CP3′ of the third spacer, the spacing EP30′ between the third spacer and the second end face of the first lens barrel along the first optical axis, and the length L′ of the first lens barrel in the direction of the first optical axis are different.

[0113] Example 3

[0114] The following is for reference Figure 8 A visual system according to Embodiment 3 of this application is described.

[0115] like Figure 8As 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 element group, a second element group, a third element group, and a fourth element group arranged sequentially from a first side to a second side along a first optical axis. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. In other examples, the first element group also includes a partially reflective layer BS (not shown). The second element group includes a second quarter-wave plate QWP2 and a second lens E2′. The third element group includes a third lens E3′. The fourth element group includes a fourth lens E4′. The spacer group includes a first spacer P1′, a second spacer P2′, and a third spacer P3′.

[0116] The structure of the optical element group in this embodiment is the same as that in Embodiment 1. That is, the basic parameter table of the visual system in this embodiment is the same as Table 1, and the aspherical coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 is that the structural dimensions of the first lens barrel P0′, the first spacer P1′, the second spacer P2′, and the third spacer P3′ are different. For example, the parameters such as 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 outer diameter D1s′ of the first side of the first spacer, the outer diameter D1m′ of the second side of the first spacer, the outer diameter D2s′ of the first side of the second spacer, the inner diameter d3m′ of the second side of the third spacer, the outer diameter D3m′ of the second side of the third spacer, the inner diameter d0s′ of the first end face of the first lens barrel, the inner diameter d0m′ of the second end face of the first lens barrel, the outer diameter D0s' of the first end face of the first lens barrel, the maximum thickness CP1′ of the first spacer, the spacing EP12′ between the first and second spacers along the first optical axis, the spacing EP23′ between the second and third spacers along the first optical axis, the maximum thickness CP3′ of the third spacer, the spacing EP30′ between the third spacer and the second end face of the first lens barrel along the first optical axis, and the length L' of the first lens barrel in the direction of the first optical axis are different.

[0117] Table 3 lists some basic parameters of the first lens barrel P0', first spacer P1', second spacer P2', and third spacer P3' in embodiments one to three, such as d1s', d1m', D1s', D1m', D2s', d3m', D3m', d0s', d0m', D0s', CP1', EP12', EP23', CP3', EP30', and L', etc. The basic parameters listed in Table 3 are based on... Figure 4 The measurements were obtained using the annotation method shown, and the units of the basic parameters listed in Table 3 are all millimeters (mm).

[0118] Example / Parameters d1s' d1m' D1s' D1m' D2s' d3m' D3m' d0s' one 26.3728 25.1838 30.472 30.5863 30.6000 23.4138 29.0081 33.3898 two 26.3728 25.1838 30.4845 30.5863 30.6000 21.0436 29.0081 33.3898 three 26.1996 24.3838 29.672 29.7863 29.8000 21.0436 29.0081 32.5898 Example / Parameters d0m′ D0s′ CP1′ EP12' EP23' CP3′ L′ EP30' one 21.8253 36.1993 2.254 4.3455 2.8584 0.0330 15.4985 3.1785 two 21.8252 35.9993 2.254 4.3785 2.8284 0.0330 15.5267 3.1785 three 21.8252 35.1993 2.254 4.5765 2.6214 0.0330 15.4985 3.1785

[0119] Table 3

[0120] Figure 9A The on-axis chromatic aberration curves of the visual system 100 in Embodiments 1, 2, and 3 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the visual system 100. Figure 9B The astigmatic curves of the visual system 100 in Embodiments 1, 2, and 3 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view angles. Figure 9C The distortion curves of the visual system 100 in Embodiments 1, 2, and 3 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 9A to 9C It can be seen that the visual system 100 given in Examples 1, 2 and 3 can achieve good imaging quality.

[0121] Example 4

[0122] The following is for reference Figure 10 A visual system according to Embodiment 4 of this application is described.

[0123] like Figure 10 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 element group, a second element group, a third element group, and a fourth element group arranged sequentially from a first side to a second side along a first optical axis. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. In other examples, the first element group also includes a partially reflective layer BS (not shown). The second element group includes a second quarter-wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. The spacer group includes a first spacer P1', a second spacer P2', and a third spacer P3'. In this embodiment, the first side refers to the human eye side, and the second side refers to the display side. The first side of each component (first lens E1′, second lens E2′, third lens E3′, fourth lens E4′, reflective polarizing element RP, first quarter-wave plate QWP1 and second quarter-wave plate QWP2) is referred to as the side closest to the human eye, and the second side is referred to as the side closest to the display.

[0124] The first lens E1' has positive optical power. Its side near the human eye (S3) is flat, and its side near the display (S4) is convex, with a partial reflective layer (BS) attached. The reflective polarizing element RP has a side near the human eye (S1) and a side near the display. The first quarter-wave plate QWP1 has a side near the human eye (S2) and a side near the display. The side near the display of the reflective polarizing element RP is attached to the side near the human eye (S2) of the first quarter-wave plate QWP1, and the side near the display of the first quarter-wave plate QWP1 is attached to the side near the human eye (S3) of the first lens E1'. The second lens E2' has negative optical power. Its side near the human eye (S6) is flat, and its side near the display (S7) is concave. The second quarter-wave plate QWP2 has a side near the human eye (S5) and a side near the display. Its side near the display is attached to the side near the human eye (S6) of the second lens E2. The third lens E3' has positive optical power. Its side near the human eye (S8) is convex, and its side near the display (S9) is convex. The fourth lens E4' has positive optical power, and its side S10 near the human eye is convex, while its side S11 near the display screen is convex.

[0125] In this example, the second side of the visual system 100 may be provided with an image surface S14. The image surface S14 may, for example, be provided with a fifth element group. The fifth element group may include a display and a third quarter-wave plate QWP3. The third quarter-wave plate QWP3 has a near-eye side S12 and a near-display side, with its near-display side attached to the near-eye side S13 of the display. Image light from the display passes sequentially through the fourth lens E4', the third lens E3', the second lens E2', the second quarter-wave plate QWP2, the first lens E1', and the first quarter-wave plate QWP1, and reaches the reflective polarizing element RP, where it undergoes a first reflection. The light after the first reflection passes through the first quarter-wave plate QWP1 and the first lens E1', and reaches the partial reflective layer BS, where it undergoes a second reflection. The light after the second reflection passes sequentially through the first lens E1', the first quarter-wave plate QWP1, and the reflective polarizing element RP, and is finally projected onto a target object (not shown) in space. For example, the light from the visual system 100, after being reflected twice, is finally projected into the user's eyes.

[0126] Table 4 shows the basic parameters of the visual system in Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm). Image light from the display passes through each element in the order of number 20 to number 2 and is finally projected into the human eye.

[0127]

[0128] Table 4

[0129] In this embodiment, the effective focal length f1′ of the first lens is 12.20 mm, the effective focal length f2′ of the second lens is -192.23 mm, the effective focal length f3′ of the third lens is 43.35 mm, the effective focal length f4′ of the fourth lens is 17.10 mm, the total effective focal length f' of the visual system is 11.17 mm, the maximum field of view FOV′ of the visual system is 110.0°, and the entrance pupil diameter EPD′ of the visual system is 4.00 mm.

[0130] In this embodiment, the near-display side S4 of the first lens E1', the near-display side S7 of the second lens E2', the near-eye side S8 and the near-display side S9 of the third lens E3', and the near-eye side S10 and the near-display side S11 of the fourth lens E4' are all aspherical. Table 5 shows the higher-order coefficients A4, A6, A8, and A11 that can be used for each aspherical mirror S4, S7-S11 in Embodiment 2. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0131]

[0132]

[0133] Table 5

[0134] Example 5

[0135] The following is for reference Figure 11 A visual system according to Embodiment 5 of this application is described.

[0136] like Figure 11As 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 element group, a second element group, a third element group, and a fourth element group arranged sequentially from a first side to a second side along a first optical axis. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. In other examples, the first element group also includes a partially reflective layer BS (not shown). The second element group includes a second quarter-wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. The spacer group includes a first spacer P1', a second spacer P2', and a third spacer P3'.

[0137] 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 that in Table 4, and the aspherical coefficient table is the same as that in 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', the second spacer P2', and the third spacer P3' are different. For example, the parameters such as 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 outer diameter D1s' of the first side of the first spacer, the outer diameter D1m' of the second side of the first spacer, the outer diameter D2s' of the first side of the second spacer, the inner diameter d3m' of the second side of the third spacer, the outer diameter D3m' of the second side of the third spacer, the inner diameter d0s' of the first end face of the first lens barrel, the inner diameter d0m' of the second end face of the first lens barrel, the outer diameter D0s' of the first end face of the first lens barrel, the maximum thickness CP1' of the first spacer, the spacing EP12' of the first and second spacers along the first optical axis, the spacing EP23' of the second and third spacers along the first optical axis, the maximum thickness CP3' of the third spacer, the spacing EP30' of the third spacer and the second end face of the first lens barrel along the first optical axis, and the length L' of the first lens barrel in the direction of the first optical axis are different.

[0138] Example 6

[0139] The following is for reference Figure 12 A visual system according to Embodiment Six of this application is described.

[0140] like Figure 12As 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 element group, a second element group, a third element group, and a fourth element group arranged sequentially from a first side to a second side along a first optical axis. The first element group includes a reflective polarizing element RP, a first quarter-wave plate QWP1, and a first lens E1'. In other examples, the first element group also includes a partially reflective layer BS (not shown). The second element group includes a second quarter-wave plate QWP2 and a second lens E2'. The third element group includes a third lens E3'. The fourth element group includes a fourth lens E4'. The spacer group includes a first spacer P1', a second spacer P2', and a third spacer P3'.

[0141] 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 that in Table 4, and the aspherical coefficient table is the same as that in 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′, the second spacer P2′, and the third spacer P3′ are different. For example, the parameters such as 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 outer diameter D1s' of the first side of the first spacer, the outer diameter D1m' of the second side of the first spacer, the outer diameter D2s' of the first side of the second spacer, the inner diameter d3m' of the second side of the third spacer, the outer diameter D3m' of the second side of the third spacer, the inner diameter d0s' of the first end face of the first lens barrel, the inner diameter d0m' of the second end face of the first lens barrel, the outer diameter D0s' of the first end face of the first lens barrel, the maximum thickness CP1' of the first spacer, the spacing EP12' of the first and second spacers along the first optical axis, the spacing EP23' of the second and third spacers along the first optical axis, the maximum thickness CP3' of the third spacer, the spacing EP30' of the third spacer and the second end face of the first lens barrel along the first optical axis, and the length L' of the first lens barrel in the direction of the first optical axis are different.

[0142] Table 6 lists some basic parameters of the first lens barrel P0', first spacer P1', second spacer P2', and third spacer P3' in Examples 4 to 6, such as d1s', d1m', D1s', D1m', D2s', d3m', D3m', d0s', d0m', D0s', CP1', EP12', EP23', CP3', EP30', and L', etc. The basic parameters listed in Table 6 are based on... Figure 4 The measurements were obtained using the annotation method shown, and the units of the basic parameters listed in Table 6 are all millimeters (mm).

[0143] Example / Parameters d1s' d1m' D1s' D1m' D2s' d3m' D3m' d0s' Four 33.1898 31.3898 35.7079 33.9896 33.8720 25.6385 34.0000 37.2602 five 33.025 30.4419 35.3878 33.0417 31.6720 23.4567 31.8000 36.6600 six 33.025 30.4419 35.3878 33.0417 30.6720 23.6205 29.8000 36.2600 Example / Parameters d0m' D0s' CP1' EP12' EP23' CP3' L' EP30' Four 31.0602 38.8602 3.4447 2.498 2.4000 0.0490 14.9903 3.1000 five 24.8956 39.2697 3.4447 2.498 2.4000 0.0490 15.0903 3.2000 six 23.3304 38.8697 3.4447 2.498 2.2070 0.0490 15.1903 3.4000

[0144] Table 6

[0145] 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 The astigmatic curves of the visual system 100 in embodiments four, five, and six are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view 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 field of view 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.

[0146] The following describes specific embodiments of the positioning system applicable to the above-described embodiments with reference to the accompanying drawings.

[0147] Example 7

[0148] The following is for reference Figure 14 The positioning system according to Embodiment Seven of this application is described.

[0149] 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.

[0150] 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 convex 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 convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface being convex and its image-side surface S9 being convex. The filter has an object-side surface S10 and an image-side surface S11. Light from the object passes sequentially through each surface S1 to S11 and is finally imaged on the imaging surface S12. The fourth lens E4 can be cemented with the fifth lens E5 to form a cemented lens.

[0151] Table 7 shows the basic parameters of the positioning system in Example 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0152]

[0153] Table 7

[0154] In this embodiment, the total effective focal length f of the positioning system is 1.02 mm, half the diagonal length of the effective pixel area on the imaging surface of the positioning system (ImgH) is 1.46 mm, the maximum field of view (FOV) of the positioning system is 170.01°, the on-axis distance TTL from the object side of the first lens to the imaging surface is 8.80 mm, the aperture number Fno of the positioning system is 1.79, and the combined focal length f45 of the fourth and fifth lenses is 11.51 mm.

[0155] In this embodiment, the object-side surface and image-side surface of any one of the second lens E2 to the fifth lens E5 are aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0156]

[0157] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; 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 i-th order correction coefficient of the aspherical surface. Table 8 shows the higher-order coefficients A4, A6, A8 and A1 that can be used for the aspherical mirrors S3-S9 in Example 7. 10 .

[0158] Face number A4 A6 A8 A10 S3 2.2835E-02 -5.8975E-03 6.8097E-04 -4.5138E-05 S4 5.6351E-02 1.6723E-02 9.1635E-03 7.1419E-03 S5 -1.8230E-02 -8.2667E-03 0.0000E+00 0.0000E+00 S6 4.5017E-02 -2.6831E-02 1.8444E-02 -4.8286E-03 S7 8.7096E-02 -2.7514E-01 1.9508E-01 -8.8720E-02 S8 8.9480E-01 -1.2767E+00 7.7901E-01 -1.9428E-01 S9 -4.9922E-02 1.9019E-02 -1.6599E-02 6.0651E-03

[0159] Table 8

[0160] Example 8

[0161] The following is for reference Figure 15 The positioning system according to Embodiment 8 of this application is described.

[0162] like Figure 15 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.

[0163] The structure of the five-element lens group in this embodiment is the same as that in Embodiment 7. That is, the basic parameter table of the positioning system in this embodiment is the same as that in Table 7, and the aspherical coefficient table is the same as that in Table 8. The difference between this embodiment and Embodiment 7 is that the structural dimensions of the second lens barrel P0, the first positioning element P1, the second positioning element P2, and the third positioning element P3 are different. For example, the parameters such as the inner diameter d1s of the object side of the first positioning member, the outer diameter D1s of the object side of the first positioning member, the inner diameter d2s of the object side of the second positioning member, the outer diameter D2s of the object side of the second positioning member, the inner diameter d3s of the object side of the third positioning member, the outer diameter D3s of the object side of the third positioning member, the outer 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 outer diameter D0s of the object side end face of the second lens barrel, the outer diameter D0m of the image side end face of the second lens barrel, the distance EP01 between the object side end face of the second lens barrel and the first positioning member along the second optical axis, the distance EP12 between the first positioning member and the second positioning member along the second optical axis, the distance EP30 between the image side end faces of the third positioning member and the second lens barrel, the length L of the second lens barrel in the direction of the second optical axis, and the sum of the distances ∑EP between any two adjacent positioning members from the first positioning member to the third positioning member along the second optical axis are different.

[0164] Table 9 provides 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 in embodiments seven and eight, such as d1s, D1s, d2s, D2s, d3s, D3s, D3m, d0s, d0m, D0s, D0m, EP01, EP12, EP30, L, and ∑EP, etc. Some of the basic parameters listed in Table 9 are based on... Figure 5 The measurements were obtained using the annotation method shown, and the units for the basic parameters listed in Table 9 are all millimeters (mm).

[0165]

[0166]

[0167] Table 9

[0168] Figure 16A The on-axis chromatic aberration curves of the positioning system 200 of embodiments seven and eight are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the positioning system 200. Figure 16B The astigmatic curves of the positioning system 200 of Embodiments 7 and 8 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view angles. Figure 16C The distortion curves of the positioning system 200 in embodiments seven and eight are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 16A to 16CIt can be seen that the positioning system 200 given in Examples 7 and 8 can achieve good imaging quality.

[0169] Example 9

[0170] The following is for reference Figure 17 The positioning system according to Embodiment 9 of this application is described.

[0171] like Figure 17 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.

[0172] 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 being concave and its image-side surface S9 being convex. The filter has an object-side surface S10 and an image-side surface S11. Light from the object passes sequentially through each surface S1 to S11 and is finally imaged on the imaging surface S12. The fourth lens E4 can be cemented with the fifth lens E5 to form a cemented lens.

[0173] Table 10 shows the basic parameters of the positioning system in Example 9, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0174]

[0175] Table 10

[0176] In this embodiment, the total effective focal length f of the positioning system is 1.07 mm, half the diagonal length of the effective pixel area on the imaging surface of the positioning system (ImgH) is 1.50 mm, the maximum field of view (FOV) of the positioning system is 166.51°, the on-axis distance TTL from the object side of the first lens to the imaging surface is 9.20 mm, the aperture number Fno of the positioning system is 1.79, and the combined focal length f45 of the fourth and fifth lenses is 2.14 mm.

[0177] In this embodiment, the object-side surface and image-side surface of any one of the second lens E2 to the fifth lens E5 are aspherical. Table 11 lists the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S3-S9 in Embodiment Nine. 10 A 12 A 14 and A 16 .

[0178] Face number A4 A6 A8 A10 A12 A14 A16 S3 5.5132E-03 -9.0433E-04 6.8767E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 4.2577E-02 7.6780E-03 1.0757E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 1.0388E-01 -1.0828E-01 3.8104E-01 -7.3865E-01 8.2268E-01 -4.6470E-01 1.0692E-01 S6 -9.1412E-02 3.9774E-01 -6.7085E-01 7.2085E-01 -4.5791E-01 2.0142E-01 -4.3267E-02 S7 -2.4254E-01 5.4760E-01 -1.1727E+00 1.5443E+00 -1.2687E+00 5.8042E-01 -1.1630E-01 S8 -9.7722E-01 1.6589E+00 -1.0955E+00 7.8408E-01 -4.0344E-01 -7.5358E-02 1.4181E-01 S9 -7.5589E-02 2.9097E-01 -2.8420E-01 4.6404E-01 -6.0970E-01 4.5522E-01 -1.3052E-01

[0179] Table 11

[0180] Example 10

[0181] The following is for reference Figure 18 The positioning system according to Embodiment 10 of this application is described.

[0182] like Figure 18 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.

[0183] The structure of the five-element lens group in this embodiment is the same as that in Embodiment 9. That is, the basic parameter table of the positioning system in this embodiment is the same as that in Table 10, and the aspherical coefficient table is the same as that in Table 11. The difference between this embodiment and Embodiment 9 is that the structural dimensions of the second lens barrel P0, the first positioning element P1, the second positioning element P2, and the third positioning element P3 are different. For example, the parameters such as the inner diameter d1s of the object side of the first positioning member, the outer diameter D1s of the object side of the first positioning member, the inner diameter d2s of the object side of the second positioning member, the outer diameter D2s of the object side of the second positioning member, the inner diameter d3s of the object side of the third positioning member, the outer diameter D3s of the object side of the third positioning member, the outer 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 outer diameter D0s of the object side end face of the second lens barrel, the outer diameter D0m of the image side end face of the second lens barrel, the distance EP01 between the object side end face of the second lens barrel and the first positioning member along the second optical axis, the distance EP12 between the first positioning member and the second positioning member along the second optical axis, the distance EP30 between the image side end faces of the third positioning member and the second lens barrel, the length L of the second lens barrel in the direction of the second optical axis, and the sum of the distances ∑EP between any two adjacent positioning members from the first positioning member to the third positioning member along the second optical axis are different.

[0184] Table 12 lists 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 in embodiments nine and ten, such as d1s, D1s, d2s, D2s, d3s, D3s, D3m, d0s, d0m, D0s, D0m, EP01, EP12, EP30, L, and ∑EP, etc. Some of the basic parameters listed in Table 12 are based on... Figure 5 The measurements were obtained using the annotation method shown, and the units of the basic parameters listed in Table 12 are all millimeters (mm).

[0185] Example / Parameters d1s D1s d2s D2s d3s D3s D3m d0s Nine 4.4176 9.0000 2.5400 4.2388 2.3113 4.0160 4.0160 9.0000 ten 4.4168 9.0000 2.5400 4.8191 2.3113 4.2000 4.2000 9.4900 Example / Parameters d0m D0s D0m EP01 EP12 L EP30 ∑EP Nine 2.4405 10.7458 4.5425 1.2396 1.7697 6.9508 2.3312 2.4184 ten 2.4405 10.5400 4.5425 1.2396 1.7697 6.9500 2.3312 2.4184

[0186] Table 12

[0187] Figure 19A The on-axis chromatic aberration curves of the positioning system 200 of Embodiments 9 and 10 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the positioning system 200. Figure 19B The astigmatic curves of the positioning system 200 of Embodiments 9 and 10 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view angles. Figure 19C The distortion curves of the positioning system 200 in Embodiments 9 and 10 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 19A to 19C It can be seen that the positioning system 200 given in Examples 9 and 10 can achieve good imaging quality.

[0188] Example 11

[0189] The following is for reference Figure 20 The positioning system according to Embodiment Eleven of this application is described.

[0190] 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.

[0191] 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 convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface being convex and its image-side surface S9 being convex. The filter has an object-side surface S10 and an image-side surface S11. Light from the object passes sequentially through each surface S1 to S11 and is finally imaged on the imaging surface S12. The fourth lens E4 can be cemented with the fifth lens E5 to form a cemented lens.

[0192] Table 13 shows the basic parameters of the positioning system in Example 11, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0193]

[0194]

[0195] Table 13

[0196] In this embodiment, the total effective focal length f of the positioning system is 1.16 mm, half the diagonal length of the effective pixel area on the imaging surface of the positioning system (ImgH) is 1.44 mm, the maximum field of view (FOV) of the positioning system is 170.14°, the on-axis distance TTL from the object side of the first lens to the imaging surface is 8.54 mm, the aperture number Fno of the positioning system is 2.23, and the combined focal length f45 of the fourth and fifth lenses is 2.30 mm.

[0197] In this embodiment, the object-side surface and image-side surface of any one of the second lens E2 to the fifth lens E5 are aspherical. Table 14 lists the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S3-S9 in Embodiment Eleven. 10 A 12 A 14 and A 16 .

[0198] Face number A4 A6 A8 A10 A12 A14 A16 S3 -1.4988E-01 -3.4651E-01 4.2843E-01 -3.1818E-01 2.2939E-01 -1.2734E-01 2.7679E-02 S4 -2.3320E-01 -3.5119E-01 -1.5219E+00 8.9955E+00 -2.0106E+01 2.1715E+01 -9.2567E+00 S5 4.2405E-02 -1.3906E-01 1.4925E-01 -9.9117E-03 7.9512E-02 -1.1613E-01 6.5487E-02 S6 -7.9369E-02 -2.8792E-02 7.0347E-02 -6.5074E-02 8.0555E-14 -6.0224E-18 1.2971E-19 S7 -6.8316E-02 3.0303E-02 -8.3753E-02 7.2499E-02 -2.0747E-15 -7.5578E-18 -3.0084E-20 S8 4.1886E-01 -8.5807E-01 1.1506E+00 -1.2658E+00 -2.6034E-01 1.7275E+00 -1.1336E+00 S9 -8.4059E-03 4.7364E-02 -1.8098E-01 5.2189E-01 -8.5377E-01 7.4396E-01 -2.5384E-01

[0199] Table 14

[0200] Example 12

[0201] The following is for reference Figure 21 A positioning system according to Embodiment Twelve of this application is described.

[0202] like Figure 21As 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.

[0203] The structure of the five-element lens group in this embodiment is the same as that in Embodiment 11. That is, the basic parameter table of the positioning system in this embodiment is the same as that in Table 13, and the aspherical coefficient table is the same as that in Table 14. The difference between this embodiment and Embodiment 11 is that the structural dimensions of the second lens barrel P0, the first positioning element P1, the second positioning element P2, and the third positioning element P3 are different. For example, the parameters such as the inner diameter d1s of the object side of the first positioning member, the outer diameter D1s of the object side of the first positioning member, the inner diameter d2s of the object side of the second positioning member, the outer diameter D2s of the object side of the second positioning member, the inner diameter d3s of the object side of the third positioning member, the outer diameter D3s of the object side of the third positioning member, the outer 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 outer diameter D0s of the object side end face of the second lens barrel, the outer diameter D0m of the image side end face of the second lens barrel, the distance EP01 between the object side end face of the second lens barrel and the first positioning member along the second optical axis, the distance EP12 between the first positioning member and the second positioning member along the second optical axis, the distance EP30 between the image side end faces of the third positioning member and the second lens barrel, the length L of the second lens barrel in the direction of the second optical axis, and the sum of the distances ∑EP between any two adjacent positioning members from the first positioning member to the third positioning member along the second optical axis are different.

[0204] Table 15 lists 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 in Examples 11 and 12, such as d1s, D1s, d2s, D2s, d3s, D3s, D3m, d0s, d0m, D0s, D0m, EP01, EP12, EP30, L, and ∑EP, etc. Some of the basic parameters listed in Table 15 are based on... Figure 5 The measurements were obtained using the annotation method shown, and the units for the basic parameters listed in Table 15 are all millimeters (mm).

[0205] Example / Parameter d1s D1s d2s D2s d3s D3s D3m d0s eleven 3.6025 8.8185 1.7725 4.7460 2.7390 3.9700 4.0302 9.2472 twelve 3.6025 9.0000 1.9335 4.8000 2.7390 3.9704 4.0430 9.4448 Example / Parameters d0m D0s D0m EP01 EP12 L EP30 ∑EP eleven 2.4108 9.9867 4.7933 2.0842 0.7326 6.1789 1.8510 1.6078 twelve 2.4108 10.4000 4.8000 2.0842 0.7366 6.1789 1.8510 1.5918

[0206] Table 15

[0207] Figure 22AThe on-axis chromatic aberration curves of the positioning system 200 in Embodiments 11 and 12 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the positioning system 200. Figure 22B The astigmatic curves of the positioning system 200 in Examples 11 and 12 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different field of view angles. Figure 22C The distortion curves of the positioning system 200 in Examples 11 and 12 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 22A to 22C It can be seen that the positioning system 200 given in Examples 11 and 12 can achieve good imaging quality.

[0208] refer to Figure 1 The virtual reality device 10 provided in this application includes the visual system 100 in any of the above embodiments and the positioning system 200 in any of the above embodiments. The visual system and the positioning system can be combined in pairs to form 36 virtual reality devices, meaning there are 36 examples of virtual reality devices.

[0209] Example 1: The virtual reality device includes the visual system of Embodiment 1 and the positioning system of Embodiment 7;

[0210] Example 2: The virtual reality device includes the visual system of Embodiment 2 and the positioning system of Embodiment 7;

[0211] Example 3: The virtual reality device includes the visual system of Embodiment 3 and the positioning system of Embodiment 7;

[0212] Example 4: The virtual reality device includes the visual system of Embodiment 4 and the positioning system of Embodiment 7;

[0213] Example 5: The virtual reality device includes the visual system of Embodiment 5 and the positioning system of Embodiment 7;

[0214] Example 6: The virtual reality device includes the visual system of Example 6 and the positioning system of Example 7;

[0215] Example 7: The virtual reality device includes the visual system of Embodiment 1 and the positioning system of Embodiment 8;

[0216] Example 8: The virtual reality device includes the visual system of Embodiment 2 and the positioning system of Embodiment 8;

[0217] Example 9: The virtual reality device includes the visual system of Embodiment 3 and the positioning system of Embodiment 8;

[0218] Example 10: The virtual reality device includes the visual system of Embodiment 4 and the positioning system of Embodiment 8;

[0219] Example 11: The virtual reality device includes the visual system of Embodiment 5 and the positioning system of Embodiment 8;

[0220] Example 12: The virtual reality device includes the visual system of Embodiment Six and the positioning system of Embodiment Eight;

[0221] Example 13: The virtual reality device includes the visual system of Embodiment 1 and the positioning system of Embodiment 9;

[0222] Example 14: The virtual reality device includes the visual system of Embodiment 2 and the positioning system of Embodiment 9;

[0223] Example 15: The virtual reality device includes the visual system of Embodiment 3 and the positioning system of Embodiment 9;

[0224] Example 16: The virtual reality device includes the visual system of Embodiment 4 and the positioning system of Embodiment 9;

[0225] Example 17: The virtual reality device includes the visual system of Embodiment 5 and the positioning system of Embodiment 9;

[0226] Example 18: The virtual reality device includes the visual system of Embodiment Six and the positioning system of Embodiment Nine;

[0227] Example 19: The virtual reality device includes the visual system of Embodiment 1 and the positioning system of Embodiment 10;

[0228] Example 20: The virtual reality device includes the visual system of Embodiment 2 and the positioning system of Embodiment 10;

[0229] Example 21: The virtual reality device includes the visual system of Embodiment 3 and the positioning system of Embodiment 10;

[0230] Example 22: The virtual reality device includes the visual system of Embodiment 4 and the positioning system of Embodiment 10;

[0231] Example 23: The virtual reality device includes the visual system of Embodiment 5 and the positioning system of Embodiment 10;

[0232] Example 24: The virtual reality device includes the visual system of Embodiment Six and the positioning system of Embodiment Ten;

[0233] Example 25: The virtual reality device includes the visual system of Embodiment 1 and the positioning system of Embodiment 11;

[0234] Example 26: The virtual reality device includes the visual system of Embodiment 2 and the positioning system of Embodiment 11;

[0235] Example 27: The virtual reality device includes the visual system of Embodiment 3 and the positioning system of Embodiment 11;

[0236] Example 28: The virtual reality device includes the visual system of Embodiment 4 and the positioning system of Embodiment 11;

[0237] Example 29: The virtual reality device includes the visual system of Embodiment 5 and the positioning system of Embodiment 11;

[0238] Example 30: The virtual reality device includes the visual system of Example 6 and the positioning system of Example 11;

[0239] Example 31: The virtual reality device includes the visual system of Embodiment 1 and the positioning system of Embodiment 12;

[0240] Example 32: The virtual reality device includes the visual system of Embodiment 2 and the positioning system of Embodiment 12;

[0241] Example 33: The virtual reality device includes the visual system of Embodiment 3 and the positioning system of Embodiment 12;

[0242] Example 34: The virtual reality device includes the visual system of Embodiment 4 and the positioning system of Embodiment 12;

[0243] Example 35: The virtual reality device includes the visual system of Embodiment 5 and the positioning system of Embodiment 12; and

[0244] Example 36: The virtual reality device includes the visual system of Example 6 and the positioning system of Example 12.

[0245] It should be understood that, such as Figure 1 As shown, the virtual reality device 10 provided in this application may further include a first optical system 300 and a second optical system 400. The structure of the first optical system 300 may be different from the structure of the positioning system 200, and the structure of the second optical system 400 may be the same as or different from the structure of the positioning system 200.

[0246] In summary, Table 16 shows the values ​​of the conditional expressions for each of the examples in Examples 1 through 36.

[0247]

[0248]

[0249]

[0250] Table 16

[0251] 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 device, comprising a visual system and a positioning system, characterized in that, The visual system includes a first lens barrel and an optical element assembly disposed within the first lens barrel. The optical element group comprises, sequentially from the first side to the second side along the first optical axis: The first element group includes a reflective polarizing element, a first quarter-wave plate, and a first lens with positive optical power. The reflective polarizing element is located on a first side of the first quarter-wave plate, and the first quarter-wave plate is located on a first side of the first lens. A partial reflective layer is provided on a second side of the first lens. The first side of the first lens is planar, and the second side is convex. The second element group includes a second quarter-wave plate and a second lens with negative optical power, wherein the second quarter-wave plate is located on a first side surface of the second lens; the first side surface of the second lens is a plane and the second side surface is a concave surface; The third element group includes a third lens with positive optical power; the first side surface of the third lens is convex, and the second side surface is convex. The fourth element group includes a fourth lens with positive optical power; the first side surface of the fourth lens is convex, and the second side surface is convex. Third quarter-wave plate; The positioning system includes a second lens barrel and a five-element lens assembly placed inside the second lens barrel. The five-element lens group comprises, sequentially from the object side to the image side along the second optical axis: The first lens with negative optical power has a convex object side and a concave image side. The second lens has negative optical power and its image side is concave. A third lens with positive optical power; The fourth lens has a convex side. The fifth lens has a convex side image. The fourth lens and the fifth lens are cemented together, and the signs of the optical power of the fourth lens and the fifth lens are opposite. The visual system has four lenses with optical power; the positioning system has five lenses with optical power. The length L' of the first lens barrel in the direction of the first optical axis, the total effective focal length f' of the visual system, the length L of the second lens barrel in the direction of the second optical axis, and the total effective focal length f of the positioning system satisfy: 3.93≤(L / f) / (L' / f')≤5.

14.

2. The virtual reality device according to claim 1, characterized in that, The length L' of the first lens barrel in the direction of the first optical axis, the maximum field of view FOV' of the visual system, the length L of the second lens barrel in the direction of the second optical axis, and the maximum field of view FOV of the positioning system satisfy: 0.18≤(tan(FOV' / 2)×L') / (tan(FOV / 2)×L)≤0.

37.

3. The virtual reality device according to claim 1, characterized in that, The visual system further includes a first spacer disposed on a second side of the first lens, a second spacer disposed on a second side of the second lens, and a third spacer disposed on a second side of the third lens. The positioning system further includes a first positioning member disposed on the image side of the first lens, a second positioning member disposed on the image side of the second lens, and a third positioning member disposed on the image side of the third lens. Wherein, the axial distance TD' between the first side of the first element group and the second side of the fourth element group, the sum of the intervals ∑EP' between any two adjacent spacers in the first spacer and the third spacer along the first optical axis, the axial distance TD between the object side of the first lens and the image side of the fifth lens, and the sum of the intervals ∑EP between any two adjacent positioning members in the first positioning member and the third positioning member along the second optical axis satisfy: 1.05≤(∑EP' / TD') / (∑EP / TD)≤2.

07.

4. The virtual reality device according to claim 1, characterized in that, The inner diameter d0s' of the first side end face of the first lens tube, the inner diameter d0m' of the second side end face of the first lens tube, the entrance pupil diameter EPD' of the visual system, the inner diameter d0s of the object side end face of the second lens tube, the inner diameter d0m of the image side end face of the second lens tube, and the entrance pupil diameter EPD of the positioning system satisfy: 5.88≤((d0s'-d0m')×EPD') / ((d0s-d0m)×EPD)≤16.

33.

5. The virtual reality device according to claim 1, characterized in that, The inner diameter d0m' of the second side end face of the first lens tube and the total effective focal length f' of the visual system satisfy: 1.91≤d0m' / f'≤2.78, and the inner diameter d0m of the image side end face of the second lens tube and the total effective focal length f of the positioning system satisfy: 2.09≤d0m / f≤2.

83.

6. The virtual reality device according to claim 1, characterized in that, The visual system further includes a third spacer disposed on the second side of the third lens, and the positioning system further includes a third positioning member disposed on the image side of the third lens. Wherein, the distance EP30' between the third spacer and the second side end face of the first lens barrel along the first optical axis, the length L' of the first lens barrel in the direction of the first optical axis, the total effective focal length f' of the visual system, the distance EP30 between the third positioning member and the image side end face of the second lens barrel along the second optical axis, the length L of the second lens barrel in the direction of the second optical axis, and the total effective focal length f of the positioning system satisfy: 3.40≤(L-EP30-f) / (L'-EP30'-f')≤6.

79.

7. The virtual reality device according to any one of claims 1 to 6, characterized in that, The visual system also includes a first spacer disposed on a second side of the first lens. Wherein, the effective focal length f1' of the first lens, the Abbe number V1' of the first lens, the effective focal length f2' of the second lens, the Abbe number V2' of the second lens, the inner diameter d1s' of the first side of the first spacer, and the inner diameter d1m' of the second side of the first spacer satisfy: -3.84≤(f1'+f2') / ((d1s'-d1m')×(V1'-V2'))≤-1.

80.

8. The virtual reality device according to any one of claims 1 to 6, characterized in that, The visual system also includes a first spacer disposed on a second side of the first lens. Wherein, the radius of curvature R2' of the second side of the first lens, the outer diameter D1s' of the first side of the first spacer and the outer diameter D0s' of the first side end face of the first lens barrel satisfy: 7.37≤R2' / (D1s'-D0s')≤12.

66.

9. The virtual reality device according to any one of claims 1 to 6, characterized in that, The visual system further includes a first spacer disposed on a second side of the first lens and a second spacer disposed on a second side of the second lens. Wherein, the effective focal length f1' of the first lens, the effective focal length f2' of the second lens, the maximum thickness CP1' of the first spacer, the spacing EP12' of the first spacer and the second spacer along the first optical axis, and the air spacing T12' of the first element group and the second element group on the first optical axis satisfy: -29.66≤(f1'+f2') / (CP1'+EP12'+T12')≤-25.

40.

10. The virtual reality device according to any one of claims 1 to 6, characterized in that, The visual system further includes a first spacer disposed on a second side of the first lens and a second spacer disposed on a second side of the second lens. Wherein, the radius of curvature R2' of the second side of the first lens, the radius of curvature R4' of the second side of the second lens, the outer diameter D1m' of the second side of the first spacer and the outer diameter D2s' of the first side of the second spacer satisfy: -2.83≤(R2'+R4') / D1m'+(R2'-R4') / D2s'≤-2.

37.

11. The virtual reality device according to any one of claims 1 to 6, characterized in that, The visual system further includes a second spacer disposed on a second side of the second lens and a third spacer disposed on a second side of the third lens. Wherein, the refractive index N3' of the third lens, the refractive index N4' of the fourth lens, the effective focal length f3' of the third lens, the spacing EP23' of the second spacer and the third spacer along the first optical axis and the maximum thickness CP3' of the third spacer satisfy: -3.61≤(N3'-N4')×f3' / (EP23'+CP3')≤-2.

45.

12. The virtual reality device according to any one of claims 1 to 6, characterized in that, The visual system further includes a second spacer disposed on a second side of the second lens and a third spacer disposed on a second side of the third lens. Wherein, the radius of curvature R6' of the second side surface of the third lens, the radius of curvature R7' of the first side surface of the fourth lens, the center thickness CT3' of the third lens on the first optical axis, the center thickness CT4' of the fourth lens on the first optical axis, the spacing EP23' between the second spacer and the third spacer along the first optical axis and the spacing EP30' between the second side end face of the third spacer and the first lens barrel along the first optical axis satisfy: -8.16≤(R6'-R7') / (CT3'+CT4'+EP23'+EP30')≤-4.

95.

13. The virtual reality device according to any one of claims 1 to 6, characterized in that, The visual system also includes a third spacer disposed on the second side of the third lens. Wherein, the radius of curvature R5' of the first side of the third lens, the Abbe number V3' of the third lens, the Abbe number V4' of the fourth lens, the inner diameter d3m' of the second side of the third spacer, and the outer diameter D3m' of the second side of the third spacer satisfy: 0.60≤R5' / ((V3'+V4')×(d3m'+D3m'))≤9.

01.

14. The virtual reality device according to any one of claims 1 to 6, characterized in that, The axial distance TD between the object side of the first lens and the image side of the fifth lens, the outer diameter D0s of the object side end face of the second lens barrel and the outer diameter D0m of the image side end face of the second lens barrel satisfy: 1.16≤TD / (D0s-D0m)≤1.

89.

15. The virtual reality device according to any one of claims 1 to 6, characterized in that, The positioning system further includes a first positioning element placed on the image side of the first lens. Wherein, the radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, the refractive index N1 of the first lens, the inner diameter d1s of the object side of the first positioning member and the outer diameter D1s of the object side of the first positioning member satisfy: 1.78≤(R1-R2)×N1 / (D1s-d1s)<3.

0.

16. The virtual reality device according to any one of claims 1 to 6, characterized in that, The positioning system further includes a first positioning element placed on the image side of the first lens and a second positioning element placed on the image side of the second lens. Wherein, the total effective focal length f of the positioning system and the effective focal length f1 of the first lens satisfy: -5.11≤f1 / f≤-2.98, the total effective focal length f of the positioning system and the effective focal length f2 of the second lens satisfy: -5.28≤f2 / f≤-2.06, and the total effective focal length f of the positioning system, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the object-side end face of the second lens barrel and the first positioning member along the second optical axis, the interval EP01 and the interval EP12 of the first positioning member and the second positioning member along the second optical axis satisfy: -2.71≤(f1-f2) / EP12-f / EP01≤3.

08.

17. The virtual reality device according to any one of claims 1 to 6, characterized in that, The positioning system further includes a first positioning element placed on the image side of the first lens and a second positioning element placed on the image side of the second lens. Wherein, the radius of curvature R2 of the image side of the first lens, the Abbe number V1 of the first lens, the radius of curvature R3 of the object side of the second lens, the Abbe number V2 of the second lens, and the distance EP12 between the first positioning member and the second positioning member along the second optical axis satisfy: -11.41≤(V1 / R2-V2 / R3)×EP12<40.

0.

18. The virtual reality device according to any one of claims 1 to 6, characterized in that, The positioning system further includes a second positioning element placed on the image side of the second lens and a third positioning element placed on the image side of the third lens. Wherein, the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, the inner diameter d2s of the object side of the second positioning member, the outer diameter D2s of the object side of the second positioning member, the inner diameter d3s of the object side of the third positioning member, and the outer diameter D3s of the object side of the third positioning member satisfy: -6.32≤(D2s+d2s) / R5+(D3s+d3s) / R6≤2.

17.

19. The virtual reality device according to any one of claims 1 to 6, characterized in that, The positioning system also includes a third positioning element placed on the image side of the third lens. Wherein, the total effective focal length f of the positioning system, the combined focal length f45 of the fourth lens and the fifth lens, the radius of curvature R8 of the image side of the fourth lens and the outer diameter D3m of the image side of the third positioning element satisfy: 0.20≤(f45-f) / (D3m-R8)≤4.81.

Images