Virtual reality devices

Abstract

This application discloses a virtual reality device, comprising a visual system and a positioning system. The visual system includes a first lens, a second lens, and a third lens sequentially from the first side to the second side along a first optical axis. The positioning system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially from the object side to the image side along a second optical axis. The aperture number Fno' of the visual system, the effective focal length f2' of the second lens, the radius of curvature R3' of the first side of the second lens, and the radius of curvature R5' of the first side of the third lens satisfy: 1.0 < (R5' - R3') × Fno' / f2' < 5.5. The aperture number Fno of the positioning system, the radius of curvature R15 of the object side of the eighth lens, the radius of curvature R16 of the image side of the eighth lens, and the refractive index N8 of the eighth lens satisfy: 0.5 ≤ R15 × N8 / (Fno × R16) < 1.0. The aperture number Fno' of the visual system and the aperture number Fno of the positioning system satisfy: 2.0. <Fno' / Fno<5.0。

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 optical systems: visual systems and positioning systems. The visual system immerses the user in the virtual world, while the positioning system captures images of the surrounding environment or the user's posture. The combination of the positioning and visual systems connects the real and virtual worlds, enabling interaction between them and providing the user with an immersive experience.

[0003] However, this type of virtual reality device, composed of multiple systems, has many problems. For example, the images produced by the visual system are relatively dark, and the light flux of the visual system and the positioning system is easily misconfigured, which can cause the positioning system to lose its way in environments with uneven lighting, greatly reducing the user's immersive experience. Summary of the Invention

[0004] 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.

[0005] One aspect of this application provides a virtual reality device comprising a viewing system and a positioning system. The viewing system includes a first lens, a second lens, and a third lens sequentially from a first side to a second side along a first optical axis. The positioning system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially from the object side to the image side along a second optical axis. The aperture number Fno' of the viewing system, the effective focal length f2' of the second lens, the radius of curvature R3' of the first side surface of the second lens, and the radius of curvature R5' of the first side surface of the third lens satisfy: 1.0 < (R5' - R3') × Fno' / f2' < 5.5. The aperture number Fno of the positioning system, the radius of curvature R15 of the object side surface of the eighth lens, the radius of curvature R16 of the image side surface of the eighth lens, and the refractive index N8 of the eighth lens satisfy: 0.5 ≤ R15 × N8 / (Fno × R16) < 1.0. The aperture number Fno' of the viewing system and the aperture number Fno of the positioning system satisfy: 2.0. <Fno' / Fno<5.0。

[0006] According to an exemplary embodiment of this application, the effective focal length f1' of the first lens, the refractive index N1' of the first lens, the radius of curvature R1' of the first side surface of the first lens, and half of the maximum field of view (Semi-FOV) of the visual system satisfy: 0 <f1'×N1' / R1'×TAN(Semi-FOV')<2.5。

[0007] According to an exemplary embodiment of this application, the radius of curvature R1' of the first side surface of the first lens, the radius of curvature R3' of the first side surface of the second lens, the air gap T12' between the first lens and the second lens on the first optical axis, the refractive index N1' of the first lens and the center thickness CT1' of the first lens on the first optical axis satisfy: 1mm < (R1' + R3') × T12' / (CT1' × N1') < 5.5mm.

[0008] According to an exemplary embodiment of this application, 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, and the Abbe number V2' of the second lens satisfy: -2.5 <f1'×V1' / (f2'×V2')<-2.0。

[0009] According to an exemplary embodiment of this application, the radius of curvature R1' of the first side surface of the first lens, the radius of curvature R3' of the first side surface of the second lens, the radius of curvature R5' of the first side surface of the third lens, and the radius of curvature R6' of the second side surface of the third lens satisfy: -2.0 <R5' / R1'+R3' / R6'<-1.0。

[0010] According to an exemplary embodiment of this application, the visual system further includes a reflective polarizing element attached to the second side of the second lens, and the center thickness CT2' of the second lens on the first optical axis, the center thickness CT3' of the third lens on the first optical axis, the air gap T23' between the second lens and the third lens on the first optical axis and the center thickness dRP of the reflective polarizing element on the first optical axis satisfy: 2.0 < (CT2' + CT3') / (T23' + dRP) < 4.0.

[0011] According to an exemplary embodiment of this application, the effective focal length f2 of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the center thickness CT2 of the second lens on the second optical axis, and the refractive index N2 of the second lens satisfy: -0.5mm <R4×CT2 / f2×N2<0mm。

[0012] According to an exemplary embodiment of this application, the effective focal length f4 of the fourth lens, the radius of curvature R8 of the image-side surface of the fourth lens, the effective focal length f7 of the seventh lens, and the radius of curvature R13 of the object-side surface of the seventh lens satisfy: -0.5 <R8×R13 / (f4×f7)<0。

[0013] According to an exemplary embodiment of this application, the refractive index N4 of the fourth lens, the center thickness CT4 of the fourth lens on the second optical axis, and the air gap T45 between the fourth and fifth lenses on the second optical axis satisfy: 20 <CT4×N4 / T45<120。

[0014] According to an exemplary embodiment of this application, the effective focal length f1 of the first lens, the radius of curvature R1 of the object side of the first lens, the effective focal length f2 of the second lens, and the radius of curvature R4 of the image side of the second lens satisfy: -2.0 < (f1 + f2) / (R1 - R4) < -1.

[0015] According to an exemplary embodiment of this application, the total effective focal length f of the positioning system, the effective focal length f3 of the third lens, the refractive index N3 of the third lens, the effective focal length f5 of the fifth lens, and the refractive index N5 of the fifth lens satisfy: 8.5 <f3×N3 / f+f5×N5 / f<13。

[0016] According to an exemplary embodiment of this application, the center thickness CT2 of the second lens on the second optical axis, the center thickness CT3 of the third lens on the second optical axis, and the center thickness CT4 of the fourth lens on the second optical axis satisfy: 2.0 < (CT2 + CT4) / CT3 < 3.5.

[0017] 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 aperture number of the visual system, the effective focal length of the second lens, and the curvature radii of the first sides of the second and third lenses, it is beneficial to rationally allocate the optical power of the lenses, increase the light flux of the visual system, and thus improve the brightness of the image formed by the visual system. By controlling the relationship between the aperture number of the positioning system, the curvature radii of the object side and image side of the eighth lens, and the refractive index of the eighth lens, it is beneficial to constrain the shape of the eighth lens, thereby increasing the light flux of the positioning system while ensuring light convergence. At the same time, rationally constraining the ratio of the aperture numbers of the visual system and the positioning system can make the aperture number of the visual system greater than that of the positioning system, thereby further increasing the light flux of the positioning system while ensuring the brightness of the image formed by the visual system, which helps the positioning system to locate in dark environments. Attached Figure Description

[0018] 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:

[0019] Figure 1 A schematic diagram of the structure of a virtual reality device according to this application is shown;

[0020] Figure 2 A schematic diagram of the visual system according to this application is shown;

[0021] Figure 3 A schematic diagram of the positioning system according to this application is shown;

[0022] Figure 4A schematic diagram of the structure of the visual system according to Embodiment 1 of this application is shown;

[0023] Figure 5 A schematic diagram of the optical path of the visual system according to Embodiment 1 of this application is shown;

[0024] Figures 6A to 6C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual system according to Embodiment 1 of this application are shown respectively.

[0025] Figure 7 A schematic diagram of the visual system according to Embodiment 2 of this application is shown;

[0026] Figure 8 A schematic diagram of the optical path of the visual system according to Embodiment 2 of this application is shown;

[0027] Figures 9A to 9C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual system according to Embodiment 2 of this application are shown respectively.

[0028] Figure 10 A schematic diagram of the visual system according to Embodiment 3 of this application is shown;

[0029] Figure 11 A schematic diagram of the optical path of the visual system according to Embodiment 3 of this application is shown;

[0030] Figures 12A to 12C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual system according to Embodiment 3 of this application are shown respectively.

[0031] Figure 13 A schematic diagram of the positioning system according to Embodiment 4 of this application is shown;

[0032] Figures 14A to 14C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the positioning system according to Embodiment 4 of this application are shown respectively.

[0033] Figure 15 A schematic diagram of the positioning system according to Embodiment 5 of this application is shown;

[0034] Figures 16A to 16C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the positioning system according to Embodiment 5 of this application are shown respectively.

[0035] Figure 17 A schematic diagram of the positioning system according to Embodiment Six of this application is shown; and

[0036] Figures 18A to 18C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the positioning system according to Embodiment Six of this application are shown respectively. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] In this text, 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 receiving side) is called the first side surface of the lens, and the surface of each lens closest to the second side (e.g., the emitting 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.

[0041] 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.

[0042] 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.

[0043] 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.

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

[0045] refer to Figure 1 The first aspect of this application provides a virtual reality device that may include a viewing system and a positioning system. The positioning system is used to capture images from the surrounding environment or the user's pose. The viewing system dynamically adjusts and projects a virtual image from a transmitter based on the positioning results obtained from the images from the surrounding environment or the user's pose. The number of viewing systems and positioning systems may be one or more. In one example, the virtual reality device may include two symmetrically arranged viewing systems. It should be understood that the virtual reality device provided in this application may also include any optical system other than the viewing system and the positioning system.

[0046] The positioning system in this application collects images from the surrounding environment or the user's pose. This collected imagery or pose is transmitted to a processing system via the positioning system's chip. The processing system analyzes the imagery or pose and determines the information required for the visual system to display based on the analysis results. This information is then transmitted to the visual system. The visual system dynamically adjusts the virtual image emitted by the transmitter based on the received information and ultimately projects the virtual image onto a receiver, such as the user's eyes, to create an immersive experience. The virtual reality device provided in this application combines the virtual immersion of a visual system with the positioning function of a positioning system, breaking through the spatial limitations of virtual reality devices and enabling interaction between the real and virtual worlds.

[0047] In an exemplary implementation, reference Figure 2The visual system may include a first lens, a second lens, and a third lens arranged sequentially from a first side to a second side along a first optical axis. An air gap may exist between adjacent lenses in the first to third lenses. As an example, the first and third lenses have positive optical power, and the second lens has negative optical power.

[0048] In an exemplary implementation, reference Figure 2 The visual system may also include a reflective polarizing element and a quarter-wave plate. The reflective polarizing element and the quarter-wave plate are bonded together to form a film layer, which is then attached to the second side of the second lens. The reflective polarizing element is positioned closer to the second lens than the quarter-wave plate. By combining the reflective polarizing element and the quarter-wave plate to form a single film layer, the number of bonding surfaces can be reduced, improving the bonding yield. In other examples, the visual system may also include a partially reflective layer attached to the second side of the third lens, where the partially reflective layer exhibits semi-transmissive and semi-reflective properties. By providing a partially reflective layer on the second side of the third lens and combining it with the reflective polarizing element and the quarter-wave plate, light can be refracted multiple times, effectively reducing the overall length of the visual system.

[0049] In an exemplary embodiment, the first side can be the receiving side, and the second side can be the transmitting side. Accordingly, the first side of each element (first lens, second lens, third lens) can be referred to as the side near the receiving part, and the second side can be referred to as the side near the transmitting part.

[0050] In an exemplary embodiment, the visual system may further include a first aperture stop, which may be disposed, for example, between the first side and the first lens. The image light from the emitting unit is finally projected onto the receiving unit after multiple refractions and reflections through the third lens, quarter-wave plate, reflective polarizing element, second lens, and first lens.

[0051] In an exemplary embodiment, image light from the transmitting unit sequentially passes through the third lens and the quarter-wave plate, reaches the reflective polarizing element, and is then reflected at the reflective polarizing element to form the first reflected image light. The first reflected image light passes through the quarter-wave plate and reaches the partial reflective layer on the second side of the third lens, and is then reflected at the partial reflective layer to form the second reflected image light. The second reflected image light sequentially passes through the third lens, the quarter-wave plate, the reflective polarizing element, the second lens, the first lens to the first aperture, and is finally projected onto the receiving unit. The visual system provided in this application effectively shortens the body length of the visual system by folding the required optical path through a combination of light reflection and refraction without affecting the projection quality.

[0052] In an exemplary implementation, reference Figure 3, the positioning system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side to the image side along the second optical axis. There may be an air gap between adjacent two of the first lens to the eighth lens. The second aperture stop may be disposed between the third lens and the fourth lens. As an example, the first lens and the second lens have negative optical powers.

[0053] In an exemplary embodiment, the f-number Fno' of the visual system, the effective focal length f2' of the second lens, the radius of curvature R3' of the first side of the second lens, and the radius of curvature R5' of the first side of the third lens may satisfy: 1.0 < (R5' - R3') × Fno' / f2' < 5.5. The f-number Fno of the positioning system, the radius of curvature R15 of the object side of the eighth lens, the radius of curvature R16 of the image side of the eighth lens, and the refractive index N8 of the eighth lens may satisfy: 0.5 ≤ R15 × N8 / (Fno × R16) < 1.0, and the f-number Fno' of the visual system and the f-number Fno of the positioning system may satisfy: 2.0 < Fno' / Fno < 5.0. By controlling the relationship between the f-number of the visual system, the effective focal length of the second lens, and the radii of curvature of the first sides of the second lens and the third lens, it is beneficial to reasonably distribute the optical powers of the lenses, increase the light flux of the visual system, and thus improve the brightness of the image formed by the visual system; by the relationship between the f-number of the positioning system, the radii of curvature of the object side and the image side of the eighth lens, and the refractive index of the eighth lens, it is beneficial to constrain the shape of the eighth lens and improve the light flux of the positioning system on the premise of ensuring light convergence; at the same time, reasonably constraining the ratio of the f-numbers of the visual system and the positioning system can make the f-number of the visual system greater than that of the positioning system, further improve the light flux of the positioning system while ensuring the brightness of the image formed by the visual system, and contribute to the positioning of the positioning system in a dark environment.

[0054] In an exemplary embodiment, the effective focal length f1' of the first lens, the refractive index N1' of the first lens, the radius of curvature R1' of the first side of the first lens, and half of the maximum field angle Semi-FOV' of the visual system may satisfy: 0 < f1' × N1' / R1' × TAN(Semi-FOV') < 2.5. By controlling the relationship between the effective focal length of the first lens, the refractive index of the first lens, the radius of curvature of the first side of the first lens, and half of the maximum field angle of the visual system, the shape of the first lens can be constrained on the premise of ensuring light convergence, thereby increasing the field angle of the visual system.

[0055] In an exemplary embodiment, the radius of curvature R1' of the first side surface of the first lens, the radius of curvature R3' of the first side surface of the second lens, the air gap T12' between the first lens and the second lens on the first optical axis, the refractive index N1' of the first lens, and the central thickness CT1' of the first lens on the first optical axis may satisfy: 1 mm < (R1' + R3') × T12' / (CT1' × N1') < 5.5 mm. By controlling the mutual relationship among the radius of curvature of the first side surfaces of the first lens and the second lens, the air gap between the first lens and the second lens on the first optical axis, the refractive index of the first lens, and the central thickness of the first lens on the first optical axis, it is beneficial to constrain the shapes of the first lens and the second lens, ensure the uniformity and formability of the first lens and the second lens, and at the same time enable the arrangement of the first lens and the second lens to be more compact, ensuring the miniaturization of the virtual reality device.

[0056] 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, and the Abbe number V2' of the second lens may satisfy: -2.5 < f1' × V1' / (f2' × V2') < -2.0. By controlling the effective focal lengths of the first lens and the second lens, the optical powers of the first lens and the second lens can be reasonably allocated, which is beneficial to achieving the convergence of light rays. At the same time, reasonably constraining the Abbe numbers of the first lens and the second lens is beneficial to reducing the chromatic aberration of the visual system, thereby improving the imaging quality of the visual system.

[0057] In an exemplary embodiment, the radius of curvature R1' of the first side surface of the first lens, the radius of curvature R3' of the first side surface of the second lens, the radius of curvature R5' of the first side surface of the third lens, and the radius of curvature R6' of the second side surface of the third lens may satisfy: -2.0 < R5' / R1' + R3' / R6' < -1.0. By controlling the mutual relationship among the radius of curvature of the first side surfaces of the first lens and the second lens and the radius of curvature of the first side surface and the second side surface of the third lens, the optical powers of the lenses in the visual system can be reasonably allocated, the direction of light rays can be constrained, which is beneficial to achieving the convergence of off-axis field light rays, thereby improving the performance and imaging quality of the visual system.

[0058] In an exemplary embodiment, the central thickness CT2' of the second lens on the first optical axis, the central thickness CT3' of the third lens on the first optical axis, the air gap T23' between the second lens and the third lens on the first optical axis, and the central thickness dRP of the reflective polarizing element on the first optical axis may satisfy: 2.0 < (CT2' + CT3') / (T23' + dRP) < 4.0. By controlling the mutual relationship among the central thicknesses of the second lens, the third lens, and the reflective polarizing element and the air gap between the second lens and the third lens, it is beneficial to the shaping and processing of the second lens, the third lens, and the reflective polarizing element, and is also beneficial to the attachment of the reflective polarizing element.

[0059] In an exemplary embodiment, the effective focal length f2 of the second lens, the radius of curvature R4 of the image side surface of the second lens, the central thickness CT2 of the second lens on the second optical axis, and the refractive index N2 of the second lens may satisfy: -0.5 mm < R4 × CT2 / (f2 × N2) < 0 mm. By controlling the mutual relationship among the effective focal length of the second lens, the radius of curvature of the image side surface of the second lens, the central thickness of the second lens on the second optical axis, and the refractive index of the second lens, it is beneficial to control the shape of the second lens, ensure the formability of the second lens, and at the same time, the optical power of the second lens can be negative, increasing the field angle of the positioning system. In addition, an appropriate refractive index is beneficial to reducing the chromatic aberration of the positioning system.

[0060] In an exemplary embodiment, the effective focal length f4 of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, the effective focal length f7 of the seventh lens, and the radius of curvature R13 of the object side surface of the seventh lens may satisfy: -0.5 < R8 × R13 / (f4 × f7) < 0. By controlling the mutual relationship among the effective focal lengths of the fourth lens and the seventh lens, the radius of curvature of the image side surface of the fourth lens, and the radius of curvature of the object side surface of the seventh lens, it is beneficial to reasonably distribute the optical powers of the fourth lens and the seventh lens, and make the optical powers of both the fourth lens and the seventh lens positive. The negative spherical aberration generated by these two lenses can balance the positive spherical aberration generated by other lenses in the positioning system, improving the imaging quality of the positioning system.

[0061] In an exemplary embodiment, the refractive index N4 of the fourth lens, the central thickness CT4 of the fourth lens on the second optical axis, and the air gap T45 between the fourth lens and the fifth lens on the second optical axis may satisfy: 20 < CT4 × N4 / T45 < 120. By controlling the mutual relationship among the refractive index of the fourth lens, the central thickness of the fourth lens on the second optical axis, and the air gap between the fourth lens and the fifth lens on the second optical axis, it is beneficial to the shaping of the fourth lens and the fifth lens, and is also beneficial to restricting the optical powers of the fourth lens and the fifth lens, achieving the convergence of marginal field light rays, correcting the aberration of the positioning system, and thus improving the imaging quality of the positioning system.

[0062] In an exemplary embodiment, the effective focal length f1 of the first lens, the radius of curvature R1 of the object side surface of the first lens, the effective focal length f2 of the second lens, and the radius of curvature R4 of the image side surface of the second lens may satisfy: -2.0 < (f1 + f2) / (R1 - R4) < -1. By controlling the interrelationship among the effective focal lengths of the first lens and the second lens, the radius of curvature of the object side surface of the first lens, and the radius of curvature of the image side surface of the second lens, the optical powers of the first lens and the second lens can be reasonably distributed, and the optical powers of both the first lens and the second lens are negative, which is beneficial to increasing the field angle of the positioning system, thereby expanding the positioning range of the positioning system.

[0063] In an exemplary embodiment, the total effective focal length f of the positioning system, the effective focal length f3 of the third lens, the refractive index N3 of the third lens, the effective focal length f5 of the fifth lens, and the refractive index N5 of the fifth lens may satisfy: 8.5 < f3×N3 / f + f5×N5 / f < 13. By controlling the interrelationship among the total effective focal length of the positioning system, the effective focal lengths of the third lens and the fifth lens, and the refractive indices of the third lens and the fifth lens, the optical powers of the third lens and the fifth lens can be reasonably distributed, which is beneficial to correcting the aberration of the positioning system. At the same time, the height of the light rays can be restricted, so that the outgoing light rays meet the requirements of the Chief Ray Angle (CRA) of the system.

[0064] In an exemplary embodiment, the central thickness CT2 of the second lens on the second optical axis, the central thickness CT3 of the third lens on the second optical axis, and the central thickness CT4 of the fourth lens on the second optical axis may satisfy: 2.0 < (CT2 + CT4) / CT3 < 3.5. By controlling the central thicknesses of the second lens, the third lens, and the fourth lens, the shapes of these three lenses can be restricted, thereby ensuring the uniformity and processability of these three lenses, which is beneficial to the shaping of these three lenses.

[0065] The virtual reality device according to the above embodiment of the present application consists of a visual system and a positioning system. Among them, the visual system may adopt multiple lenses, such as the three lenses described above, and the positioning system may adopt multiple lenses, such as the eight lenses described above. By reasonably 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. And the virtual reality device configured as above has characteristics such as miniaturization and good imaging quality, and can well meet the usage requirements of various portable electronic products in the projection scenario.

[0066] In embodiments of this application, at least one surface of each of the first to third 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. Similarly, at least one surface of each of the first to eighth lenses is an aspherical surface.

[0067] 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.

[0068] Specific embodiments of the visual system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0069] Example 1

[0070] The following is for reference Figure 4 and Figure 5 A visual system according to Embodiment 1 of this application is described.

[0071] like Figure 4 As shown, the visual system 110 may include a first lens E1', a second lens E2', and a third lens E3' arranged sequentially from the first side to the second side along a first optical axis. A first aperture stop STO' is disposed between the first side and the first lens E1'. The visual system 110 may also include a reflective polarizing element RP, a quarter-wave plate QWP, and a partial reflective layer BS. In this embodiment, the first side refers to the receiving side, and the second side refers to the emitting side. The first side surface of each element (e.g., the first lens E1', the second lens E2', and the third lens E3') is referred to as the near-receiving side surface, and the second side surface is referred to as the near-emitting side surface.

[0072] The first lens E1' has positive optical power, with its receiving side S1' being convex and its emitting side S2' being concave. The second lens E2' has negative optical power, with its receiving side S3' being concave and its emitting side S4' being convex. The third lens E3' has positive optical power, with its receiving side S5' being concave and its emitting side S6' being convex. The reflective polarizing element RP and the quarter-wave plate QWP are both attached to the emitting side S4' of the second lens E2', with the reflective polarizing element RP being closer to the second lens E2' than the quarter-wave plate QWP. A portion of the reflective layer BS can be attached to the emitting side S6' of the third lens E3'.

[0073] In this example, such as Figure 5 As shown, the image light from the transmitting unit sequentially passes through the third lens E3', the quarter-wave plate QWP, and reaches the reflective polarizing element RP, where it undergoes a first reflection. The light after the first reflection passes through the quarter-wave plate QWP and reaches the partial reflective layer BS on the second side of the third lens E3', where it undergoes a second reflection. The light after the second reflection sequentially passes through the third lens E3', the quarter-wave plate QWP, the reflective polarizing element RP, the second lens E2', and the first lens E1', and is finally projected onto the receiving unit. For example, the light from this visual system 110, after two reflections, is finally projected onto the receiving unit.

[0074] 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 emitting unit passes through each element in the order of number 15 to number 1 and is finally projected into the receiving unit.

[0075]

[0076] Table 1

[0077] In this embodiment, the total effective focal length f' of the visual system is 17.58 mm, the effective focal length f1' of the first lens E1' is 64.48 mm, the effective focal length f2' of the second lens E2' is -76.23 mm, the effective focal length f3' of the third lens E3' is 111.93 mm, half of the maximum field of view of the visual system (Semi-FOV') is 30°, and the aperture number Fno' of the visual system is 2.46.

[0078] In this embodiment, the near-receiving and near-emitting sides of the first lens E1' to the third lens E3' are both aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0079]

[0080] Where x is the distance vector from the vertex of the aspherical surface at a height 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 conic coefficient k and the higher-order coefficients A4, A6, A8 and A6 that can be used for each aspherical surface S1'-S6' in Example 1. 10 .

[0081] Face number k A4 A6 A8 A10 S1' 0.0000 -1.64E-01 1.57E-02 4.15E-03 2.52E-03 S2' 0.0000 -4.80E-01 3.71E-02 -1.52E-02 2.24E-03 S3' 0.0000 -1.01E+00 2.55E-01 -8.03E-02 1.11E-02 S4' 0.0000 -3.92E-01 9.34E-02 -3.22E-02 1.33E-02 S5' 0.0000 -1.15E-01 -4.28E-02 -8.03E-03 5.55E-03 S6' 0.0000 4.73E-02 6.11E-02 -1.37E-02 1.65E-03

[0082] Table 2

[0083] Figure 6A The on-axis chromatic aberration curve of the visual system 110 of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the visual system 110. Figure 6B The astigmatic curves of the visual system 110 of Embodiment 1 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different half-field angles. Figure 6C The distortion curves of the visual system 110 of Embodiment 1 are shown, representing the distortion magnitude values ​​corresponding to different half-field angles. According to... Figures 6A to 6C As can be seen, the visual system 110 given in Example 1 can achieve good imaging quality.

[0084] Example 2

[0085] The following is for reference Figure 7 and Figure 8 A visual system according to Embodiment 2 of this application is described.

[0086] like Figure 7 As shown, the visual system 110 may include a first lens E1', a second lens E2', and a third lens E3' arranged sequentially from the first side to the second side along a first optical axis. A first aperture stop STO' is disposed between the first side and the first lens E1'. The visual system 110 may also include a reflective polarizing element RP, a quarter-wave plate QWP, and a partial reflective layer BS. In this embodiment, the first side refers to the receiving side, and the second side refers to the emitting side. The first side surface of each element (e.g., the first lens E1', the second lens E2', and the third lens E3') is referred to as the near-receiving side surface, and the second side surface is referred to as the near-emitting side surface.

[0087] The first lens E1' has positive optical power, with its receiving side S1' and emitting side S2' both being convex. The second lens E2' has negative optical power, with its receiving side S3' being concave and its emitting side S4' being convex. The third lens E3' has positive optical power, with its receiving side S5' being concave and its emitting side S6' being convex. The reflective polarizing element RP and the quarter-wave plate QWP are both attached to the emitting side S4' of the second lens E2', with the reflective polarizing element RP being closer to the second lens E2' than the quarter-wave plate QWP. A portion of the reflective layer BS can be attached to the emitting side S6' of the third lens E3'.

[0088] In this example, such as Figure 8As shown, the image light from the transmitting unit sequentially passes through the third lens E3', the quarter-wave plate QWP, and reaches the reflective polarizing element RP, where it undergoes a first reflection. The light after the first reflection passes through the quarter-wave plate QWP and reaches the partial reflective layer BS on the second side of the third lens E3', where it undergoes a second reflection. The light after the second reflection sequentially passes through the third lens E3', the quarter-wave plate QWP, the reflective polarizing element RP, the second lens E2', and the first lens E1', and is finally projected onto the receiving unit. For example, the light from this visual system 110, after two reflections, is finally projected onto the receiving unit.

[0089] Table 3 shows the basic parameters of the visual system in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm). The image light from the emitting unit passes through each element in the order of number 15 to number 1 and is finally projected into the receiving unit.

[0090]

[0091] Table 3

[0092] In this embodiment, the total effective focal length f' of the visual system is 16.01 mm, the effective focal length f1' of the first lens E1' is 50.83 mm, the effective focal length f2' of the second lens E2' is -68.39 mm, the effective focal length f3' of the third lens E3' is 92.00 mm, half of the maximum field of view of the visual system (Semi-FOV') is 30°, and the aperture number Fno' of the visual system is 2.23.

[0093] In this embodiment, the near-receiving and near-emitting sides of the first lens E1' to the third lens E3' are both aspherical surfaces. Table 4 shows the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical surface S1'-S6' in Embodiment 2. 10 .

[0094] Face number k A4 A6 A8 A10 S1' 0.0000 -8.71E-01 6.54E-02 4.99E-02 -1.21E-02 S2' 0.0000 -1.14E+00 2.05E-01 -1.11E-02 9.11E-03 S3' 0.0000 -9.10E-01 2.26E-01 -1.34E-01 5.68E-02 S4' 0.0000 -4.50E-01 4.87E-02 -8.40E-03 2.24E-02 S5' 0.0000 -6.24E-01 1.86E-02 2.34E-02 1.44E-02 S6' 0.0000 -2.83E-01 2.03E-03 -1.49E-02 1.18E-02

[0095] Table 4

[0096] Figure 9A The on-axis chromatic aberration curve of the visual system 110 of Embodiment 2 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the visual system 110. Figure 9B The astigmatism curves of the visual system 110 of Embodiment 2 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different half-field angles. Figure 9C The distortion curve of the visual system 110 in Embodiment 2 is shown, representing the distortion magnitude corresponding to different half-field angles. According to... Figures 9A to 9CIt can be seen that the visual system 110 given in Embodiment 2 can achieve good imaging quality.

[0097] Example 3

[0098] The following is for reference Figure 10 and Figure 11 A visual system according to Embodiment 3 of this application is described.

[0099] like Figure 10 As shown, the visual system 110 may include a first lens E1', a second lens E2', and a third lens E3' arranged sequentially from the first side to the second side along a first optical axis. A first aperture stop STO' is disposed between the first side and the first lens E1'. The visual system 110 may also include a reflective polarizing element RP, a quarter-wave plate QWP, and a partial reflective layer BS. In this embodiment, the first side refers to the receiving side, and the second side refers to the emitting side. The first side surface of each element (e.g., the first lens E1', the second lens E2', and the third lens E3') is referred to as the near-receiving side surface, and the second side surface is referred to as the near-emitting side surface.

[0100] The first lens E1' has positive optical power, with its receiving side S1' being convex and its emitting side S2' being concave. The second lens E2' has negative optical power, with its receiving side S3' being concave and its emitting side S4' being convex. The third lens E3' has positive optical power, with its receiving side S5' being concave and its emitting side S6' being convex. The reflective polarizing element RP and the quarter-wave plate QWP are both attached to the emitting side S4' of the second lens E2', with the reflective polarizing element RP being closer to the second lens E2' than the quarter-wave plate QWP. A portion of the reflective layer BS can be attached to the emitting side S6' of the third lens E3'.

[0101] In this example, such as Figure 11 As shown, the image light from the transmitting unit sequentially passes through the third lens E3', the quarter-wave plate QWP, and reaches the reflective polarizing element RP, where it undergoes a first reflection. The light after the first reflection passes through the quarter-wave plate QWP and reaches the partial reflective layer BS on the second side of the third lens E3', where it undergoes a second reflection. The light after the second reflection sequentially passes through the third lens E3', the quarter-wave plate QWP, the reflective polarizing element RP, the second lens E2', and the first lens E1', and is finally projected onto the receiving unit. For example, the light from this visual system 110, after two reflections, is finally projected onto the receiving unit.

[0102] Table 5 shows the basic parameters of the visual system in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm). The image light from the emitting unit passes through each element in the order of number 15 to number 1 and is finally projected into the receiving unit.

[0103]

[0104]

[0105] Table 5

[0106] In this embodiment, the total effective focal length f' of the visual system is 18.58 mm, the effective focal length f1' of the first lens E1' is 66.83 mm, the effective focal length f2' of the second lens E2' is -86.49 mm, the effective focal length f3' of the third lens E3' is 124.90 mm, half of the maximum field of view of the visual system (Semi-FOV') is 30°, and the aperture number Fno' of the visual system is 4.94.

[0107] In this embodiment, the near-receiving and near-emitting sides of the first lens E1' to the third lens E3' are both aspherical surfaces. Table 6 shows the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical surface S1'-S6' in Embodiment 3. 10 .

[0108] Face number k A4 A6 A8 A10 S1' 0.0000 -5.73E-02 2.75E-03 -5.72E-04 1.33E-04 S2' 0.0000 -2.70E-01 2.39E-02 -4.98E-03 3.46E-04 S3' 0.0000 -6.51E-01 1.33E-01 -2.06E-02 1.26E-03 S4' 0.0000 -2.77E-01 7.16E-02 -1.82E-02 2.89E-03 S5' 0.0000 -4.17E-02 -1.59E-02 -7.59E-03 1.68E-03 S6' 0.0000 -6.63E-03 4.35E-02 -7.27E-03 5.77E-04

[0109] Table 6

[0110] Figure 12A The on-axis chromatic aberration curve of the visual system 110 of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the visual system 110. Figure 12B The astigmatic curves of the visual system 110 of Embodiment 3 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different half-field angles. Figure 12C The distortion curve of the visual system 110 of Embodiment 3 is shown, representing the distortion magnitude corresponding to different half-field angles. According to... Figures 12A to 12C It can be seen that the visual system 110 given in Embodiment 3 can achieve good imaging quality.

[0111] The following describes specific embodiments of the positioning system applicable to the above-described embodiments with reference to the accompanying drawings.

[0112] Example 4

[0113] The following is for reference Figure 13 The positioning system according to Embodiment 4 of this application is described.

[0114] like Figure 13 As shown, the positioning system 120 may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the second optical axis from the object side to the image side. The second aperture STO may be disposed between the third lens E3 and the fourth lens E4.

[0115] The first lens, E1, has negative power; its object-side surface, S1, is convex, and its image-side surface, S2, is concave. The second lens, E2, has negative power; its object-side surface, S3, is concave, and its image-side surface, S4, is concave. The third lens, E3, has positive power; its object-side surface, S5, is convex, and its image-side surface, S6, is concave. The fourth lens, E4, has positive power; its object-side surface, S7, is concave, and its image-side surface, S8, is convex. The fifth lens, E5, has positive power; its object-side surface, S9, is convex, and its image-side surface, S10, is convex. The sixth lens, E6, has negative power; its object-side surface, S11, is concave, and its image-side surface, S12, is concave. The seventh lens, E7, has positive power; its object-side surface, S13, is convex, and its image-side surface, S14, is convex. The eighth lens, E8, has positive power; its object-side surface, S15, is convex, and its image-side surface, S16, is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0116] Table 7 shows the basic parameters of the positioning system in Example 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0117]

[0118] Table 7

[0119] In this embodiment, the total effective focal length f of the positioning system is 1.13 mm, and the aperture number Fno of the positioning system is 1.10.

[0120] In this embodiment, the object-side surface and image-side surface of any one of the second lens E2 to the eighth lens E8 are aspherical, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0121]

[0122] 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 gives the higher-order coefficients A4, A6, A8, A16 that can be used for the aspherical surfaces S3-S16 in Example 4.10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0123]

[0124]

[0125] Table 8

[0126] Figure 14A The on-axis chromatic aberration curve of the positioning system 120 of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the positioning system 120. Figure 14B The astigmatic curves of the positioning system 120 of Embodiment 4 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different half-field angles. Figure 14C The distortion curves of the positioning system 120 in Embodiment 4 are shown, representing the distortion magnitude values ​​corresponding to different half-field angles. According to... Figures 14A to 14C As can be seen, the positioning system 120 given in Embodiment 4 can achieve good imaging quality.

[0127] Example 5

[0128] The following is for reference Figure 15 The positioning system according to Embodiment 5 of this application is described.

[0129] like Figure 15 As shown, the positioning system 120 may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the second optical axis from the object side to the image side. The second aperture STO may be disposed between the third lens E3 and the fourth lens E4.

[0130] The first lens, E1, has negative power; its object-side surface, S1, is convex, and its image-side surface, S2, is concave. The second lens, E2, has negative power; its object-side surface, S3, is concave, and its image-side surface, S4, is concave. The third lens, E3, has positive power; its object-side surface, S5, is convex, and its image-side surface, S6, is concave. The fourth lens, E4, has positive power; its object-side surface, S7, is concave, and its image-side surface, S8, is convex. The fifth lens, E5, has positive power; its object-side surface, S9, is convex, and its image-side surface, S10, is convex. The sixth lens, E6, has negative power; its object-side surface, S11, is concave, and its image-side surface, S12, is convex. The seventh lens, E7, has positive power; its object-side surface, S13, is convex, and its image-side surface, S14, is convex. The eighth lens, E8, has positive power; its object-side surface, S15, is convex, and its image-side surface, S16, is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0131] Table 9 shows the basic parameters of the positioning system in Example 5, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0132]

[0133] Table 9

[0134] In this embodiment, the total effective focal length f of the positioning system is 1.15 mm, and the aperture number Fno of the positioning system is 1.08.

[0135] In this embodiment, the object-side surface and image-side surface of any one of the second lens E2 to the eighth lens E8 are aspherical. Table 10 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical surfaces S3-S16 in Embodiment 5. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0136]

[0137]

[0138] Table 10

[0139] Figure 16A The on-axis chromatic aberration curve of the positioning system 120 of Embodiment 5 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the positioning system 120. Figure 16B The astigmatic curves of the positioning system 120 of Embodiment 5 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different half-field angles. Figure 16C The distortion curves of the positioning system 120 in Embodiment 5 are shown, representing the distortion magnitude values ​​corresponding to different half-field angles. According to... Figures 16A to 16C As can be seen, the positioning system 120 given in Embodiment 5 can achieve good imaging quality.

[0140] Example 6

[0141] The following is for reference Figure 17 The positioning system according to Embodiment Six of this application is described.

[0142] like Figure 17 As shown, the positioning system 120 may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the second optical axis from the object side to the image side. The second aperture STO may be disposed between the third lens E3 and the fourth lens E4.

[0143] The first lens, E1, has negative power; its object-side surface, S1, is convex, and its image-side surface, S2, is concave. The second lens, E2, has negative power; its object-side surface, S3, is concave, and its image-side surface, S4, is concave. The third lens, E3, has positive power; its object-side surface, S5, is convex, and its image-side surface, S6, is concave. The fourth lens, E4, has positive power; its object-side surface, S7, is concave, and its image-side surface, S8, is convex. The fifth lens, E5, has positive power; its object-side surface, S9, is convex, and its image-side surface, S10, is convex. The sixth lens, E6, has negative power; its object-side surface, S11, is concave, and its image-side surface, S12, is concave. The seventh lens, E7, has positive power; its object-side surface, S13, is convex, and its image-side surface, S14, is convex. The eighth lens, E8, has positive power; its object-side surface, S15, is convex, and its image-side surface, S16, is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0144] Table 11 shows the basic parameters of the positioning system in Example 6, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0145]

[0146] Table 11

[0147] In this embodiment, the total effective focal length f of the positioning system is 1.27 mm, and the aperture number Fno of the positioning system is 1.10.

[0148] In this embodiment, the object-side surface and image-side surface of any one of the second lens E2 to the eighth lens E8 are aspherical. Table 12 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical surface S3-S16 in Embodiment Six. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0149]

[0150]

[0151] Table 12

[0152] Figure 18A The on-axis chromatic aberration curve of the positioning system 120 of Embodiment Six is ​​shown, which represents the deflection of the focal point of light of different wavelengths after passing through the positioning system 120. Figure 18B The astigmatic curves of the positioning system 120 of Embodiment Six are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different half-field angles. Figure 18C The distortion curves of the positioning system 120 in Embodiment Six are shown, representing the distortion magnitude values ​​corresponding to different half-field angles. According to... Figures 18A to 18C As can be seen, the positioning system 120 given in Embodiment Six can achieve good imaging quality.

[0153] Continue to refer to Figure 1 The virtual reality device 100 provided in this application may include the visual system 110 and the positioning system 120 in any of the above embodiments. The visual system and the positioning system can be combined in pairs to form nine virtual reality devices, meaning there are nine examples of virtual reality devices.

[0154] Example 1: The virtual reality device includes the visual system of Embodiment 1 and the positioning system of Embodiment 4;

[0155] Example 2: The virtual reality device includes the visual system of Embodiment 1 and the positioning system of Embodiment 5;

[0156] Example 3: The virtual reality device includes the visual system of Embodiment 1 and the positioning system of Embodiment 6;

[0157] Example 4: The virtual reality device includes the visual system of Embodiment 2 and the positioning system of Embodiment 4;

[0158] Example 5: The virtual reality device includes the visual system of Embodiment 2 and the positioning system of Embodiment 5;

[0159] Example 6: The virtual reality device includes the visual system of Embodiment 2 and the positioning system of Embodiment 6;

[0160] Example 7: The virtual reality device includes the visual system of Embodiment 3 and the positioning system of Embodiment 4;

[0161] Example 8: The virtual reality device includes the visual system of Embodiment 3 and the positioning system of Embodiment 5; and

[0162] Example 9: The virtual reality device includes the visual system of Embodiment 3 and the positioning system of Embodiment 6.

[0163] In summary, Table 13 shows the values ​​of the conditional expressions for each of the examples in Examples 1 through 9.

[0164]

[0165]

[0166] Table 13

[0167] 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 comprises, sequentially from the first side to the second side along the first optical axis, the following: A first lens with positive optical power has a convex first side surface; A second lens with negative optical power has a concave first side and a convex second side. A reflective polarizing element is located on the second side of the second lens; A quarter-wave plate is located on the second side of the reflective polarizing element; A third lens with positive optical power has a concave first side and a convex second side. A partial reflective layer is located on the second side of the third lens; The positioning system, along the second optical axis from the object side to the image side, includes, in sequence: The first lens with negative optical power has a convex object side and a concave image side. The second lens has negative optical power, with both its object side and image side being concave. The third lens with positive power has a convex object side and a concave image side. The fourth lens has positive optical power, with a concave object side and a convex image side. The fifth lens has positive optical power, with both its object side and image side being convex. The sixth lens has negative optical power and its object side is concave. The seventh lens has positive optical power, and its object side and image side are both convex. The eighth lens, which has positive optical power, has a convex object side and a concave image side. The visual system has three lenses with optical power, the first side being the receiving side and the second side being the transmitting side; The number of lenses with optical power in the positioning system is eight; The aperture number Fno' of the visual system, the effective focal length f2' of the second lens, the radius of curvature R3' of the first side surface of the second lens, and the radius of curvature R5' of the first side surface of the third lens satisfy: 1.26≤(R5'-R3')×Fno' / f2'≤5.36; The aperture number Fno of the positioning system, the radius of curvature R15 of the object side of the eighth lens, the radius of curvature R16 of the image side of the eighth lens, and the refractive index N8 of the eighth lens satisfy: 0.50≤R15×N8 / (Fno×R16)≤0.78; and The aperture number Fno' of the visual system and the aperture number Fno of the positioning system satisfy the following condition: 2.0 < Fno' / Fno ≤ 4.

58.

2. The virtual reality device according to claim 1, characterized in that, The effective focal length f1' of the first lens, the refractive index N1' of the first lens, the radius of curvature R1' of the first side surface of the first lens, and half of the maximum field of view of the visual system, Semi-FOV', satisfy the following condition: 0.59≤f1'×N1' / R1'×TAN(Semi-FOV')≤2.

20.

3. The virtual reality device according to claim 1, characterized in that, The radius of curvature R1' of the first side surface of the first lens, the radius of curvature R3' of the first side surface of the second lens, the air gap T12' between the first lens and the second lens on the first optical axis, the refractive index N1' of the first lens, and the center thickness CT1' of the first lens on the first optical axis satisfy: 1.42mm≤(R1'+R3')×T12' / (CT1'×N1')≤5.19mm.

4. The virtual reality device according to claim 1, characterized in that, 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, and the Abbe number V2' of the second lens satisfy: -2.32≤f1'×V1' / (f2'×V2')<-2.

0.

5. The virtual reality device according to claim 1, characterized in that, The radius of curvature R1' of the first side surface of the first lens, the radius of curvature R3' of the first side surface of the second lens, the radius of curvature R5' of the first side surface of the third lens, and the radius of curvature R6' of the second side surface of the third lens satisfy: -1.77≤R5' / R1'+R3' / R6'≤-1.

47.

6. The virtual reality device according to claim 1, characterized in that, The center thickness CT2' of the second lens on the first optical axis, the center thickness CT3' of the third lens on the first optical axis, the air gap T23' of the second lens and the third lens on the first optical axis, and the center thickness dRP of the reflective polarizing element on the first optical axis satisfy: 2.45≤(CT2'+CT3') / (T23'+dRP)≤3.

29.

7. The virtual reality device according to any one of claims 1 to 6, characterized in that, The effective focal length f2 of the second lens, the radius of curvature R4 of the image side of the second lens, the center thickness CT2 of the second lens on the second optical axis and the refractive index N2 of the second lens satisfy: -0.26mm≤R4×CT2 / f2×N2≤-0.24mm.

8. The virtual reality device according to any one of claims 1 to 6, characterized in that, The effective focal length f4 of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the effective focal length f7 of the seventh lens, and the radius of curvature R13 of the object side of the seventh lens satisfy: -0.5 < R8 × R13 / (f4 × f7) ≤ -0.

32.

9. The virtual reality device according to any one of claims 1 to 6, characterized in that, The refractive index N4 of the fourth lens, the center thickness CT4 of the fourth lens on the second optical axis, and the air gap T45 between the fourth lens and the fifth lens on the second optical axis satisfy the following condition: 20.32≤CT4×N4 / T45≤118.

13.

10. The virtual reality device according to any one of claims 1 to 6, characterized in that, The effective focal length f1 of the first lens, the radius of curvature R1 of the object side of the first lens, the effective focal length f2 of the second lens, and the radius of curvature R4 of the image side of the second lens satisfy: -1.67≤(f1+f2) / (R1-R4)≤-1.

41.

11. The virtual reality device according to any one of claims 1 to 6, characterized in that, The total effective focal length f of the positioning system, the effective focal length f3 of the third lens, the refractive index N3 of the third lens, the effective focal length f5 of the fifth lens, and the refractive index N5 of the fifth lens satisfy the following condition: 8.90≤f3×N3 / f+f5×N5 / f≤12.

93.

12. The virtual reality device according to any one of claims 1 to 6, characterized in that, The center thickness CT2 of the second lens on the second optical axis, the center thickness CT3 of the third lens on the second optical axis, and the center thickness CT4 of the fourth lens on the second optical axis satisfy: 2.30≤(CT2+CT4) / CT3≤3.01.

Images