Virtual reality device

Abstract

The application discloses a virtual reality device, comprising a visual system and a positioning system; the visual system comprises: a first lens which is a positive lens; a second lens which is a negative lens; and a third lens which is a positive lens; the positioning system comprises: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with optical power and a fifth lens; the distance TDm of the first side of the first lens to the second side of the third lens on the first optical axis in the visual system and the sum of the air intervals of any two adjacent lenses of the first lens to the third lens on the first optical axis ∑ATm and the distance TDn of the object side of the first lens to the image side of the fifth lens on the second optical axis in the positioning system and the sum of the air intervals of any two adjacent lenses of the first lens to the fifth lens on the second optical axis ∑ATn satisfy: 6.0 < TDm / ∑ATm+TDn / ∑ATn < 14.0.

Description

Technical Field

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

[0002] In virtual reality (VR) devices, the visual system is the user's entry point into the virtual reality world and the exit point for the user's visual perception. The positioning system connects the real world and the virtual world by capturing the user's body movements. By working together, the visual system and the positioning system can achieve interaction between the real world and the virtual world, allowing users to have an immersive experience.

[0003] Currently, the visual and positioning systems in virtual reality devices are quite long and contain a large number of lenses, resulting in larger and heavier virtual reality devices and a poorer user experience. Summary of the Invention

[0004] This application provides a virtual reality device, including a visual system and a positioning system; wherein, the visual system includes, along a first optical axis from a first side to a second side, a first lens, which is a positive lens; a second lens, which is a negative lens; and a third lens, which is a positive lens; the positioning system includes, along the second optical axis from the object side to the image side, a first lens having negative optical power; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having optical power; and a fifth lens having optical power; the first side of the first lens in the visual system extends to the third side... The distance TDm of the second side surface of the mirror on the first optical axis, the distance TDn of the object side surface of the first lens to the image side surface of the fifth lens in the positioning system on the second optical axis, and the sum of the air gaps ∑Atm of any two adjacent lenses with optical power among the first to third lenses in the visual system and the sum of the air gaps ∑ATn of any two adjacent lenses with optical power among the first to fifth lenses in the positioning system on the second optical axis satisfy: 6.0<TDm / ∑ATm+TDn / ∑ATn<14.0.

[0005] In one embodiment, the effective focal length fm of the visual system and the effective focal length fn of the positioning system satisfy: 25.0 < fm / fn < 35.0.

[0006] In one embodiment, the entrance pupil diameter EPDm of the visual system, the entrance pupil diameter EPDn of the positioning system, the effective focal length fm of the visual system, and the effective focal length fn of the positioning system satisfy: 7.0 < fm / EPDm + fn / EPDn < 9.0.

[0007] In one embodiment, the effective focal length f2m of the second lens in the visual system, the effective focal length fm of the visual system, and the refractive index N2m of the second lens in the visual system satisfy: -15.0 < f2m N2m / fm < 15.0.

[0008] In one embodiment, the visual system further includes a reflective polarizing element, wherein the radius of curvature R2m of the second side surface of the first lens in the visual system, the center thickness CT1m of the first lens in the visual system on the first optical axis, the air gap T12m between the first lens and the second lens in the visual system on the first optical axis, and the center thickness dRPm of the reflective polarizing element in the visual system on the first optical axis satisfy: -28.0 < R2m / (CT1m + T12m - dRPm) < -4.0.

[0009] In one embodiment, the radius of curvature R4m of the second side surface of the second lens in the visual system, the radius of curvature R5m of the first side surface of the third lens in the visual system, and the air gap T23m between the second lens and the third lens in the visual system on the first optical axis satisfy: 2.0 < |R4m - R5m| / T23m < 30.0.

[0010] In one embodiment, the radius of curvature R5m of the first side surface of the third lens in the visual system, the radius of curvature R6m of the second side surface of the third lens in the visual system, and the radius of curvature R2m of the second side surface of the first lens in the visual system satisfy: -17.0 < |R5m-R6m| / R2m < 0.0.

[0011] In one embodiment, the visual system further includes a reflective polarizing element and a quarter-wave plate. The effective focal length fm of the visual system, the sum of the center thicknesses of all lenses in the visual system on the first optical axis ∑CTm, the center thickness dRPm of the reflective polarizing element in the visual system on the first optical axis, and the center thickness dQWPm of the quarter-wave plate in the visual system on the first optical axis satisfy: 1.0 < fm / (∑CTm + dRPm + dQWPm) < 2.5.

[0012] In one embodiment, the air gap T12n between the first and second lenses on the second optical axis, the air gap T23n between the second and third lenses on the second optical axis, the center thickness CT1n of the first lens on the second optical axis, and the center thickness CT2n of the second lens on the second optical axis satisfy: 6.0 < T12n / CT1n (T23n / CT2n) < 10.0.

[0013] In one embodiment, the effective focal length f1n of the first lens in the positioning system, the refractive index N1n of the first lens in the positioning system, the radius of curvature R1n of the object-side surface of the first lens in the positioning system, and the radius of curvature R2n of the image-side surface of the first lens in the positioning system satisfy: -2.5 < f1n N1n / (R1n-R2n)<-0.5.

[0014] In one embodiment, the effective focal length f4n of the fourth lens in the positioning system, the effective focal length f5n of the fifth lens in the positioning system, the radius of curvature R8n of the image-side surface of the fourth lens in the positioning system, the radius of curvature R9n of the object-side surface of the fifth lens in the positioning system, and the radius of curvature R10n of the image-side surface of the fifth lens in the positioning system satisfy: 0.1 < |(f4n+f5n) / (R8n+R9n+R10n)|.

[0015] In one embodiment, the effective focal length f3n of the third lens in the positioning system, the refractive index N3n of the third lens in the positioning system, and the radius of curvature R5n of the object-side surface of the third lens in the positioning system satisfy: 1.5 < |f3n| N3n / R5n|<4.5.

[0016] The virtual reality device of this application, by setting five lenses for the positioning system, and making the first and second lenses have negative optical power, is beneficial to increasing the field of view of the positioning system. By setting three lenses for the visual system, optical path folding can be achieved, which can reduce the length of the visual system. While ensuring the molding process and imaging quality, by controlling the distance from the first surface to the last surface of the lenses in the visual system and the positioning system, as well as the sum of the air gaps between any two adjacent lenses with optical power, to satisfy 6.0 < TDm / ∑ATm + TDn / ∑ATn < 14.0, the total length of the positioning system and the visual system can be reduced, thereby achieving miniaturization of the virtual reality device 100, reducing the weight of the virtual reality device, making the virtual reality device more comfortable to wear, enhancing the user's immersive experience, and meeting the user's needs. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0018] Figures 1A to 1C A schematic diagram of the structure of a virtual reality device, a visual system, and a positioning system according to an exemplary embodiment of this application is shown.

[0019] Figures 2A to 2BA schematic diagram of the structure of Embodiment 1 of the visual system according to this application is shown;

[0020] Figures 3A to 3C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Embodiment 1 of the visual system are shown respectively.

[0021] Figures 4A to 4B A schematic diagram of the structure of Embodiment 2 of the visual system according to this application is shown;

[0022] Figures 5A to 5C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Embodiment 2 of the visual system are shown respectively.

[0023] Figures 6A to 6B A schematic diagram of the structure of embodiment 3 of the visual system according to this application is shown;

[0024] Figures 7A to 7C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of embodiment 3 of the visual system are shown respectively.

[0025] Figure 8 A schematic diagram of the structure of Embodiment 1 of the positioning system according to this application is shown;

[0026] Figures 9A to 9C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of embodiment 1 of the positioning system are shown respectively;

[0027] Figure 10 A schematic diagram of the structure of Embodiment 2 of the positioning system according to this application is shown;

[0028] Figures 11A to 11C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of embodiment 2 of the positioning system are shown respectively.

[0029] Figure 12 A schematic diagram of the structure of embodiment 3 of the positioning system according to this application is shown; and

[0030] Figures 13A to 13C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of embodiment 3 of the positioning system are shown respectively. Detailed Implementation

[0031] 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. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0032] It should be noted that in this specification, the terms "first," "second," 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, and the second lens may also be referred to as the first lens.

[0033] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. 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 strictly to scale.

[0034] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region.

[0035] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when 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 expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, 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.

[0036] 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 a 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.

[0037] 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.

[0038] The features, principles and other aspects of this application are described in detail below.

[0039] Figures 1A to 1CSchematic diagrams of a virtual reality device, a visual system, and a positioning system according to exemplary embodiments of this application are shown. Figure 1A As shown, a virtual reality device 100 according to an exemplary embodiment of this application may include a viewing system 110 and a positioning system 120. For example... Figure 1B As shown, the visual system 110 may include a first lens E1m, a second lens E2m, and a third lens E3m arranged sequentially from the first side to the second side along a first optical axis. The first lens E1m may be a positive lens, the second lens E2m may be a negative lens, and the third lens E3m may be a positive lens. Figure 1C As shown, the positioning system 120 may include a first lens E1n, a second lens E2n, a third lens E3n, a fourth lens E4n, and a fifth lens E5n arranged sequentially from the object side to the image side along the second optical axis. The first lens E1n has negative optical power, the second lens E2n has negative optical power, the third lens E3n has positive optical power, the fourth lens E4n has optical power, and the fifth lens E5n has optical power.

[0040] In an exemplary embodiment, the first side of the first lens E1m of the visual system 110 may be concave or flat, and the second side may be convex. The first side of the second lens E2m of the visual system 110 may be concave or flat, and the second side may be convex or concave. The first side of the third lens E3m of the visual system 110 may be concave or convex, and the second side may be convex.

[0041] In an exemplary embodiment, at least one of the first lens E1m to the third lens E3m of the visual system 110 may be an aspherical lens. Aspherical lenses have better radius of curvature characteristics and have the advantages of improving distortion aberration and astigmatism aberration. By using an aspherical lens, aberrations that occur during imaging can be eliminated as much as possible, thereby improving image quality.

[0042] In an exemplary embodiment, the object-side surface of the first lens E1n of the positioning system 120 may be convex, and the image-side surface may be concave; the object-side surface of the second lens E2n of the positioning system 120 may be convex, and the image-side surface may be concave; the object-side surface of the third lens E3n of the positioning system 120 may be convex or concave, and the image-side surface may be convex or concave; the object-side surface of the fourth lens E4n of the positioning system 120 may be convex, and the image-side surface may be concave or convex; the object-side surface of the fifth lens E5n of the positioning system 120 may be convex or concave, and the image-side surface may be convex.

[0043] In an exemplary embodiment, at least one of the second lens E2n to the fifth lens E5n of the positioning system 120 may be an aspherical lens.

[0044] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy the condition 6.0 < TDm / ∑ATm + TDn / ∑ATn < 14.0, where TDm is the distance on the first optical axis from the first side surface of the first lens E1m to the second side surface of the third lens E3m in the visual system 110, TDn is the distance on the second optical axis from the object side surface of the first lens E1n to the image side surface of the fifth lens E5n in the positioning system 120, ∑ATm is the sum of the air gaps on the first optical axis between any two adjacent lenses with optical power among the first lens E1m to the third lens E3m in the visual system 110, and ∑ATn is the sum of the air gaps on the second optical axis between any two adjacent lenses with optical power among the first lens E1n to the fifth lens E5n in the positioning system 120.

[0045] According to an exemplary embodiment of this application, the virtual reality device 100, by providing five lenses for the positioning system 120, and making the first lens E1n and the second lens E2n have negative optical power, is beneficial to increasing the field of view of the positioning system 120. By providing three lenses for the viewing system 110, optical path folding is achieved, which can reduce the length of the viewing system 110. While ensuring the molding process and imaging quality, by controlling the distance from the first surface to the last surface of the lenses in the viewing system 110 and the positioning system 120, as well as the sum of the air gaps between any two adjacent lenses with optical power, to satisfy 6.0 < TDm / ∑ATm + TDn / ∑ATn < 14.0, the total system length of the positioning system 120 and the viewing system 110 can be reduced, thereby achieving miniaturization of the virtual reality device 100, reducing the weight of the virtual reality device 100, making the virtual reality device 100 more comfortable to wear, enhancing the user's immersive experience, and meeting the user's usage needs.

[0046] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy the condition 25.0 < fm / fn < 35.0, where fm is the effective focal length of the visual system 110 and fn is the effective focal length of the positioning system 120. By controlling the ratio of the effective focal length of the visual system 110 to the effective focal length of the positioning system 120, the optical power of each lens in the two systems can be effectively controlled, thereby controlling the direction of light and improving the aberrations of the two systems.

[0047] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy the condition 7.0 < fm / EPDm + fn / EPDn < 9.0, where EPDm is the entrance pupil diameter of the visual system 110, EPDn is the entrance pupil diameter of the positioning system 120, fm is the effective focal length of the visual system 110, and fn is the effective focal length of the positioning system 120. By controlling the ratio of the effective focal length to the entrance pupil diameter of the visual system 110 and the positioning system 120, the F-numbers of the two systems can be controlled, thereby increasing the light flux of the positioning system 120, which is beneficial for positioning in dark environments.

[0048] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy the condition -15.0 < f2m N2m / fm < 15.0, where f2m is the effective focal length of the second lens E2m in the visual system 110, fm is the effective focal length of the visual system 110, and N2m is the refractive index of the second lens E2m in the visual system 110. By controlling the ratio of the effective focal length and refractive index of the second lens in the visual system 110 to the effective focal length of the visual system 110, the chromatic aberration of the visual system 110 can be reduced, thereby improving the imaging quality of the visual system 110.

[0049] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy the condition -28.0 < R2m / (CT1m+T12m-dRPm) < -4.0, wherein the visual system 110 further includes a reflective polarizing element RP, R2m is the radius of curvature of the second side surface of the first lens E1m in the visual system 110, CT1m is the center thickness of the first lens E1m in the visual system 110 on the first optical axis, T12m is the air gap between the first lens E1m and the second lens E2m in the visual system 110 on the first optical axis, and dRPm is the center thickness of the reflective polarizing element RP in the visual system 110 on the first optical axis. By controlling the ratio of the radius of curvature of the first side surface of the first lens in the visual system 110 to the center thickness of the first lens, the air gap between the first lens and the second lens, and the center thickness of the reflective polarizing element, the visual system 110 can be made more compact, which is beneficial to shortening the length of the visual system 110 and making the virtual reality device 100 thinner and lighter.

[0050] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy the condition 2.0 < |R4m - R5m| / T23m < 30.0, where R4m is the radius of curvature of the second side surface of the second lens E2m in the visual system 110, R5m is the radius of curvature of the first side surface of the third lens E3m in the visual system 110, and T23m is the air gap between the second lens E2m and the third lens E3m in the visual system 110 on the first optical axis. By controlling the ratio of the radius of curvature of the second side surface of the second lens and the radius of curvature of the first side surface of the third lens in the visual system 110 to the air gap between the second lens and the third lens, the optical power of the first lens and the third lens of the visual system 110 can be reasonably allocated, which is beneficial to the convergence of light, can improve the aberration of the visual system 110, and at the same time shorten the length of the visual system 110, which is beneficial to reducing the weight of the virtual reality device 100.

[0051] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy the condition -17.0 < |R5m - R6m| / R2m < 0.0, where R5m is the radius of curvature of the first side surface of the third lens E3m in the visual system 110, R6m is the radius of curvature of the second side surface of the third lens E3m in the visual system 110, and R2m is the radius of curvature of the second side surface of the first lens E1m in the visual system 110. By controlling the ratio of the radii of curvature of the first and second sides of the third lens in the visual system 110 to the radius of curvature of the second side surface of the first lens, the shape of the lens in the visual system 110 can be reasonably controlled, ensuring the uniformity and manufacturability of the lens, and reducing the risk of the lens surface shape degrading the system performance.

[0052] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy the condition 1.0 < fm / (∑CTm+dRPm+dQWPm) < 2.5. The visual system 110 further includes a reflective polarizing element RP and a quarter-wave plate QWP. fm is the effective focal length of the visual system 110, ∑CTm is the sum of the center thicknesses of all lenses in the visual system 110 along the first optical axis, dRPm is the center thickness of the reflective polarizing element RP in the visual system 110 along the first optical axis, and dQWPm is the center thickness of the quarter-wave plate QWP in the visual system 110 along the first optical axis. By controlling the ratio of the effective focal length of the visual system 110 to the sum of the center thicknesses of all lenses in the visual system 110, and the center thicknesses of the reflective polarizing element and the quarter-wave plate, the center thickness of each optical element in the visual system 110 can be reasonably controlled. While ensuring system performance and lens formability, the overall length of the visual system 110 can be shortened, which is beneficial for the miniaturization of the virtual reality device 100.

[0053] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy condition 6.0 < T12n / CT1n (T23n / CT2n) < 10.0, where T12n is the air gap between the first lens E1n and the second lens E2n in the positioning system 120 on the second optical axis, T23n is the air gap between the second lens E2n and the third lens E3n in the positioning system 120 on the second optical axis, CT1n is the center thickness of the first lens E1n in the positioning system 120 on the second optical axis, and CT2n is the center thickness of the second lens E2n in the positioning system 120 on the second optical axis. By controlling the ratio of the air gap between the first and second lenses in the positioning system 120 to the air gap between the second and third lenses, the center thickness of the first lens, and the center thickness of the second lens, the positions of the lenses in the positioning system 120 can be reasonably allocated. While ensuring the manufacturability of the lenses, the positioning system 120 is made more compact, facilitating the overall layout of the virtual reality device 100.

[0054] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy the condition -2.5 < f1n. N1n / (R1n-R2n) < -0.5, where f1n is the effective focal length of the first lens E1n in the positioning system 120, N1n is the refractive index of the first lens E1n in the positioning system 120, R1n is the radius of curvature of the object-side surface of the first lens E1n in the positioning system 120, and R2n is the radius of curvature of the image-side surface of the first lens E1n in the positioning system 120. By controlling the ratio of the effective focal length and refractive index of the first lens in the positioning system 120 to the radii of curvature of the object-side and image-side surfaces of the first lens, the negative optical power of the first lens can be reasonably controlled, which is beneficial to increasing the field of view of the positioning system 120.

[0055] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy the condition 0.1 < |(f4n+f5n) / (R8n+R9n+R10n)|, where f4n is the effective focal length of the fourth lens E4n in the positioning system 120, f5n is the effective focal length of the fifth lens E5n in the positioning system 120, R8n is the radius of curvature of the image-side surface of the fourth lens E4n in the positioning system 120, R9n is the radius of curvature of the object-side surface of the fifth lens E5n in the positioning system 120, and R10n is the radius of curvature of the image-side surface of the fifth lens E5n in the positioning system 120. By controlling the ratio of the effective focal length of the fourth and fifth lenses in the positioning system 120 to the radius of curvature of the image-side surface of the fourth and fifth lenses and the radius of curvature of the object-side surface of the fifth lens, it is beneficial to control the exit angle of the light and meet the requirements of the principal ray angle of the positioning system 120.

[0056] In an exemplary embodiment, the virtual reality device 100 of this application can satisfy the condition 1.5 < |f3n N3n / R5n|<4.5, where f3n is the effective focal length of the third lens E3n in the positioning system 120, N3n is the refractive index of the third lens E3n in the positioning system 120, and R5n is the radius of curvature of the object-side surface of the third lens E3n in the positioning system 120. By controlling the ratio of the effective focal length and refractive index of the third lens to the radius of curvature of the object-side surface of the third lens in the positioning system 120, the optical power of the third lens can be ensured to be positive, thereby generating negative spherical aberration. This can balance the positive spherical aberration generated by other lenses in the positioning system 120, which is beneficial to improving the imaging quality of the positioning system 120.

[0057] In an exemplary embodiment, the visual system 110 may further include an aperture stop, which may be disposed at an appropriate location within the visual system 110, for example, the aperture stop may be located between the first side and the first lens E1m. The aperture stop can constrain the optical path and control the light intensity.

[0058] In an exemplary embodiment, the positioning system 120 may further include an aperture stop, which may be disposed at an appropriate position in the positioning system 120. For example, the aperture stop may be located between the third lens E3n and the fourth lens E4n in the positioning system 120.

[0059] In an exemplary embodiment, the visual system 110 further includes a partial reflective element BS, which may be a semi-transparent and semi-reflective film layer deposited on the first side of the second lens E2m or the first side of the third lens E3m or the second side of the third lens E3m in the visual system 110.

[0060] In an exemplary embodiment, the positioning system in the positioning system 120 may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0061] In an exemplary implementation, such as Figure 1B As shown, the visual system 110 may also include a transmitter F and a receiver J. The first lens E1m to the third lens E3m of the visual system 110 may be an imaging unit, which is disposed between the transmitter F and the receiver J. The first side may be the receiver J side and the second side may be the transmitter F side.

[0062] The positioning system 120 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 a chip in the positioning system 120. 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 110. The visual system 110 dynamically adjusts the virtual image of the transmitting unit F based on the received information and ultimately projects the virtual image onto the receiving unit J, such as the user's eyes, to create an immersive experience for the user. The virtual reality device 100 provided in this application combines the virtual immersion of the visual system 110 with the positioning function of the positioning system 120, breaking through the spatial limitations of virtual reality devices and enabling interaction between the real and virtual worlds.

[0063] In an exemplary embodiment, the transmitting unit F may be a display, the second side may be the display side, and the first side may be the eye side, such as... Figure 1A As shown, the visual system 110 may include two identical imaging units arranged side by side, corresponding to the human eye.

[0064] Those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the above embodiments do not limit the number of positioning systems 120, for example, such as Figure 1A As shown, the virtual reality device 100 may include two positioning systems 120, and if necessary, the virtual reality device 100 may also include three positioning systems 120 or other numbers of positioning systems 120.

[0065] The following describes a specific embodiment of the visual system 110 applicable to the above-described embodiments with reference to the accompanying drawings.

[0066] Example 1

[0067] The following is for reference Figures 2A to 3C Description of Embodiment 1 of the visual system 110 according to this application. Figures 2A to 2B A schematic diagram of the structure of Embodiment 1 of the visual system 110 according to this application is shown.

[0068] like Figures 2A to 2B As shown, the visual system 110 includes, in sequence from the first side to the second side along the first optical axis: an aperture stop STO, a first lens E1m, a second lens E2m, a third lens E3m, and an image surface. A reflective polarizing element RP is attached to the first side of the first lens E1m, a quarter-wave plate QWP is attached to the second side of the second lens E2m, and a partially reflective element BS is attached to the first side of the third lens E3m.

[0069] The light beam emitted from the image surface passes sequentially through the third lens E3m, the partial reflector BS, the quarter-wave plate QWP, the second lens E2m, the first lens E1m, and reaches the reflective polarizer RP. It is reflected at the reflective polarizer RP and passes again through the first lens E1m, the second lens E2m, the quarter-wave plate QWP, and reaches the partial reflector BS. After that, the light beam is reflected again at the partial reflector BS and passes sequentially through the quarter-wave plate QWP, the second lens E2m, the first lens E1m, and the reflective polarizer RP to exit towards the first side.

[0070] In this embodiment, the first side of the first lens E1m is concave and the second side is convex; the first side of the second lens E2m is concave and the second side is convex; and the first side of the third lens E3m is concave and the second side is convex.

[0071] Table 1 shows the basic parameters of Embodiment 1 of the visual system 110, where the units for radius of curvature and thickness are millimeters (mm).

[0072]

[0073] Table 1

[0074] In Embodiment 1, the first side surface S1 and the second side surface S2 of the first lens Em1, the first side surface S3 and the second side surface S4 of the second lens E2m, and the first side surface S5 and the second side surface S6 of the third lens E3m are all aspherical surfaces, and the surface shape of each aspherical lens is... The following aspherical formulas can be used for limitation:

[0075] (1)

[0076] in, For an aspherical surface along the optical axis at a height of h When the position is such that the distance from the vertex of the non-spherical surface is the sag; c For the paraxial curvature of an aspherical surface, c =1 / R (i.e., paraxial curvature) c (The reciprocal of the radius of curvature R in Table 1 above). k The conic coefficient; Ai Is it an aspherical first i -th order correction coefficients. Table 2 below shows the conic coefficients of each aspherical mirror S1, S2, S3, S4, S5 and S6 in Embodiment 1, which can be used in visual system 110. k and coefficients of higher-order terms A 4 , A 6 , A 8 andA 10 .

[0077]

[0078] Table 2

[0079] Figure 3A An on-axis chromatic aberration curve of embodiment 1 of the visual system 110 is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the visual system 110. Figure 3B The astigmatic curves of Embodiment 1 of the visual system 110 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 3C The distortion curve of Embodiment 1 of the visual system 110 is shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 3A to 3C It can be seen that Embodiment 1 of the visual system 110 can achieve good imaging quality.

[0080] Example 2

[0081] The following is for reference Figures 4A to 5C This section describes Embodiment 2 of the visual system 110 according to this application. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in this embodiment and the following embodiments. Figures 4A to 4B A schematic diagram of the structure of Embodiment 2 of the visual system 110 according to this application is shown.

[0082] like Figures 4A to 4B As shown, the visual system 110 includes, in sequence from the first side to the second side along the first optical axis: an aperture stop STO, a first lens E1m, a second lens E2m, a third lens E3m, and an image surface. A reflective polarizing element RP and a quarter-wave plate QWP are attached to the first side of the second lens E2m, and a partially reflective element BS is attached to the second side of the third lens E3m.

[0083] The light beam emitted from the image surface passes sequentially through the partial reflective element BS, the third lens E3m, the second lens E2m, the quarter-wave plate QWP, and reaches the reflective polarizing element RP. It is reflected at the reflective polarizing element RP and passes through the quarter-wave plate QWP, the second lens E2m, the third lens E3m again and reaches the partial reflective element BS. After that, the light beam is reflected again at the partial reflective element BS and passes sequentially through the third lens E3m, the second lens E2m, the quarter-wave plate QWP, the reflective polarizing element RP, and the first lens E1m to exit towards the first side.

[0084] In this embodiment, the first side of the first lens E1m is concave and the second side is convex; the first side of the second lens E2m is flat and the second side is concave; and the first side of the third lens E3m is convex and the second side is convex.

[0085] Table 3 shows the basic parameters of Embodiment 2 of the visual system 110, where the units for radius of curvature and thickness are millimeters (mm). In this embodiment, the first side surface S1 and the second side surface S2 of the first lens E1m, the second side surface S4 of the second lens E2m, and the first side surface S5 and the second side surface S6 of the third lens E3m are all aspherical. Table 4 shows the conic coefficients of each aspherical mirror surface S1, S2, S4, S5, and S6 in Embodiment 2 of the visual system 110. k and coefficients of higher-order terms A 4 , A 6 , A 8 and A 10 Each aspherical surface shape can be defined by formula (1) given in embodiment 1 of the above-mentioned visual system 110.

[0086]

[0087] Table 3

[0088]

[0089] Table 4

[0090] Figure 5A An on-axis chromatic aberration curve of embodiment 2 of visual system 110 is shown, which represents the deflection of the convergence focal point of light of different wavelengths after passing through visual system 110. Figure 5B The astigmatic curves of embodiment 2 of the visual system 110 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5C The distortion curves of Embodiment 2 of the visual system 110 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 5A to 5C It can be seen that Embodiment 2 of the visual system 110 can achieve good imaging quality.

[0091] Example 3

[0092] The following is for reference Figures 6A to 7C This section describes an embodiment 3 of the visual system 110 according to this application. For the sake of brevity, descriptions similar to those in embodiment 1 will be omitted in this embodiment and the following embodiments. Figures 6A to 6B A schematic diagram of the structure of Embodiment 3 of the visual system 110 according to this application is shown.

[0093] like Figures 6A to 6BAs shown, the visual system 110 includes, in sequence from the first side to the second side along the first optical axis: an aperture stop STO, a first lens E1m, a second lens E2m, a third lens E3m, and an image surface. A reflective polarizing element RP and a quarter-wave plate QWP are attached to the first side of the first lens E1m, and a partially reflective element BS is attached to the first side of the second lens E2m.

[0094] The light beam emitted from the image surface passes sequentially through the third lens E3m, the second lens E2m, the partial reflector BS, the first lens E1m, the quarter-wave plate QWP, and reaches the reflective polarizer RP. It is reflected at the reflective polarizer RP and passes through the quarter-wave plate QWP and the first lens E1m again to reach the partial reflector BS. After that, the light beam is reflected again at the partial reflector BS and passes sequentially through the first lens E1m, the quarter-wave plate QWP, and the reflective polarizer RP to exit towards the first side.

[0095] In this embodiment, the first side of the first lens E1m is a plane and the second side is a convex surface; the first side of the second lens E2m is a concave surface and the second side is a concave surface; and the first side of the third lens E3m is a convex surface and the second side is a convex surface.

[0096] Table 5 shows the basic parameters of Embodiment 3 of the visual system 110, where the units for radius of curvature and thickness are millimeters (mm). In this embodiment, the second side surface S2 of the first lens E1, the first side surface S3 and the second side surface S2 of the second lens E2m, and the first side surface S5 and the second side surface S6 of the third lens E3m are all aspherical. Table 6 shows the conic coefficients of each aspherical mirror surface S2, S3, S4, S5 and S6 in Embodiment 3 of the visual system 110. k and coefficients of higher-order terms A 4 , A 6 , A 8 and A 10 Each aspherical surface shape can be defined by formula (1) given in embodiment 1 of the above-mentioned visual system 110.

[0097]

[0098] Table 5

[0099]

[0100] Table 6

[0101] Figure 7AAn on-axis chromatic aberration curve for embodiment 3 of the visual system 110 is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the visual system 110. Figure 7B The astigmatic curves of embodiment 3 of the visual system 110 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7C The distortion curves of embodiment 3 of the visual system 110 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 7A to 7C It can be seen that embodiment 3 of the visual system 110 can achieve good imaging quality.

[0102] Furthermore, in embodiments 1 to 3 of the visual system 110, the effective focal length fm of the visual system 110, the effective focal length f1m of the first lens E1m in the visual system 110, the effective focal length f2m of the second lens E2m in the visual system 110, and the effective focal length f3m of the third lens E3m in the visual system 110 are shown in Table 7.

[0103]

[0104] Table 7

[0105] The following describes a specific embodiment of the positioning system 120 applicable to the above-described embodiments with reference to the accompanying drawings.

[0106] Example 1

[0107] The following is for reference Figures 8 to 9C Embodiment 1 of the positioning system 120 according to this application is described. Figure 8 A schematic diagram of the structure of a positioning system 120 according to an embodiment of this application is shown.

[0108] like Figure 8 As shown, the positioning system 120 includes, in sequence from the object side to the image side along the second optical axis: a first lens E1n, a second lens E2n, a third lens E3n, an aperture stop STO, a fourth lens E4n, a fifth lens E5n, a filter E6n, and an imaging surface S13.

[0109] In this embodiment, the first lens E1n has negative optical power, its object side is convex, and its image side is concave; the second lens E2n has negative optical power, its object side is convex, and its image side is concave; the third lens E3n has positive optical power, its object side is convex, and its image side is convex; the fourth lens E4n has negative optical power, its object side is convex, and its image side is concave; and the fifth lens E5n has positive optical power, its object side is convex, and its image side is convex.

[0110] Table 8 shows the basic parameters of Embodiment 1 of the positioning system 120, where the units for radius of curvature and thickness are millimeters (mm). In this embodiment, the object-side and image-side surfaces of the second lens E2n to the fifth lens E5n are aspherical. Table 9 shows the higher-order coefficients of each aspherical mirror S3-S10 in Embodiment 1 that can be used in the positioning system 120. A 4 , A 6 , A 8 and A 10 Each aspherical surface shape can be defined by formula (1) given in embodiment 1 of the above-mentioned visual system 110.

[0111]

[0112] Table 8

[0113]

[0114] Table 9

[0115] Figure 9A An on-axis chromatic aberration curve of embodiment 1 of the positioning system 120 is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the lens. Figure 9B The astigmatic curves of embodiment 1 of the positioning system 120 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 9C The distortion curves of Embodiment 1 of the positioning system 120 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 embodiment 1 of the positioning system 120 can achieve good imaging quality.

[0116] Example 2

[0117] The following is for reference Figures 10 to 11C Embodiment 2 of the positioning system 120 according to this application is described. Figure 10 A schematic diagram of the structure of embodiment 2 of the positioning system 120 according to this application is shown.

[0118] like Figure 10 As shown, the positioning system 120 includes, in sequence from the object side to the image side along the second optical axis: a first lens E1n, a second lens E2n, a third lens E3n, an aperture stop STO, a fourth lens E4n, a fifth lens E5n, a filter E6n, and an imaging surface S13.

[0119] In this embodiment, the first lens E1n has negative optical power, its object side is convex, and its image side is concave; the second lens E2n has negative optical power, its object side is convex, and its image side is concave; the third lens E3n has positive optical power, its object side is convex, and its image side is concave; the fourth lens E4n has positive optical power, its object side is convex, and its image side is convex; and the fifth lens E5n has negative optical power, its object side is concave, and its image side is convex.

[0120] Table 10 shows the basic parameters of Embodiment 2 of the positioning system 120, where the units for radius of curvature and thickness are millimeters (mm). In this embodiment, the object-side and image-side surfaces of the second lens E2n to the fifth lens E5n are aspherical. Table 11 shows the higher-order coefficients of each aspherical mirror S3-S10 in Embodiment 2 that can be used in the positioning system 120. A 4 , A 6 , A 8 , A 10 , A 12 , A 14 and A 16 Each aspherical surface shape can be defined by formula (1) given in embodiment 1 of the above-mentioned visual system 110.

[0121]

[0122] Table 10

[0123]

[0124] Table 11

[0125] Figure 11A An on-axis chromatic aberration curve of embodiment 2 of the positioning system 120 is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the lens. Figure 11B The astigmatic curves of embodiment 2 of the positioning system 120 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 11C The distortion curves of embodiment 2 of the positioning system 120 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 11A to 11C It can be seen that embodiment 2 of the positioning system 120 can achieve good imaging quality.

[0126] Example 3

[0127] The following is for reference Figures 12 to 13C Embodiment 3 of the positioning system 120 according to this application is described. Figure 12 A schematic diagram of the structure of embodiment 3 of the positioning system 120 according to this application is shown.

[0128] like Figure 12 As shown, the positioning system 120 includes, in sequence from the object side to the image side along the second optical axis: a first lens E1n, a second lens E2n, a third lens E3n, an aperture stop STO, a fourth lens E4n, a fifth lens E5n, a filter E6n, and an imaging surface S13.

[0129] In this embodiment, the first lens E1n has negative optical power, its object side is convex, and its image side is concave; the second lens E2n has negative optical power, its object side is convex, and its image side is concave; the third lens E3n has positive optical power, its object side is concave, and its image side is convex; the fourth lens E4n has negative optical power, its object side is convex, and its image side is concave; and the fifth lens E5n has positive optical power, its object side is convex, and its image side is convex.

[0130] Table 12 shows the basic parameters of Embodiment 3 of the positioning system 120, where the units for radius of curvature and thickness are millimeters (mm). In this embodiment, the object-side and image-side surfaces of the second lens E2n to the fifth lens E5n are aspherical. Table 13 shows the higher-order coefficients of each aspherical mirror S3-S10 in Embodiment 3 that can be used in the positioning system 120. A 4 , A 6 , A 8 , A 10 , A 12 , A 14 and A 16 Each aspherical surface shape can be defined by formula (1) given in embodiment 1 of the above-mentioned visual system 110.

[0131]

[0132] Table 12

[0133]

[0134] Table 13

[0135] Figure 13A An on-axis chromatic aberration curve of embodiment 3 of the positioning system 120 is shown, which represents the deviation of the convergence focus of light of different wavelengths after passing through the lens. Figure 13B The astigmatic curves of embodiment 3 of the positioning system 120 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 13C The distortion curves of embodiment 3 of the positioning system 120 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 embodiment 3 of the positioning system 120 can achieve good imaging quality.

[0136] Furthermore, in embodiments 1 to 3 of the positioning system 120, the effective focal length fn of the positioning system 120, the effective focal length f1n of the first lens E1n in the positioning system 120, the effective focal length f2n of the second lens E2n in the positioning system 120, the effective focal length f3n of the third lens E3n in the positioning system 120, the effective focal length f4n of the fourth lens E4n in the positioning system 120, and the effective focal length f5n of the fifth lens E5n in the positioning system 120 are shown in Table 14.

[0137]

[0138] Table 14

[0139] By combining Embodiment 1 of the visual system 110 with Embodiments 1, 2, and 3 of the positioning system 120, respectively, embodiments 1-1, 1-2, and 1-3 of the virtual reality device 100 are formed. By combining Embodiment 2 of the visual system 110 with Embodiments 1, 2, and 3 of the positioning system 120, embodiments 2-1, 2-2, and 2-3 of the virtual reality device 100 are formed. By combining Embodiment 3 of the visual system 110 with Embodiments 1, 2, and 3 of the positioning system 120, embodiments 3-1, 3-2, and 3-3 of the virtual reality device 100 are formed. Embodiments 1-1 to 3-3 of the virtual reality device 100 respectively satisfy the conditions shown in Tables 15, 16, and 17.

[0140]

[0141] Table 15

[0142]

[0143] Table 16

[0144]

[0145] Table 17

[0146] 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 protection 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 concept of this application. 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, characterized in that, Includes visual systems and positioning systems; among which, The visual system comprises, sequentially from the first side to the second side along the first optical axis, the following: The first lens is a positive lens, and its second side surface is a convex surface; The second lens is a negative lens, and its second side surface is concave; and The third lens is a positive lens, with its first side surface being convex and its second side surface being convex. The positioning system, along the second optical axis from the object side to the image side, includes, in sequence: The first lens has negative optical power, and its object side is convex while its image side is concave. The second lens has negative optical power and its image-side surface is concave. The third lens has positive optical power; The fourth lens has optical power and its object-side surface is convex; and The fifth lens has optical power, and its image-side surface is convex. The visual system further includes a reflective polarizing element, a quarter-wave plate, and a partially reflective element; the reflective polarizing element is located on a first side of the quarter-wave plate; the quarter-wave plate is located on a first side of a first lens in the visual system, or the quarter-wave plate is located on a first side of a second lens in the visual system; the partially reflective element is located on a first side of a second lens in the visual system, or the partially reflective element is located on a second side of a third lens in the visual system. The visual system has three lenses with optical power, the positioning system has five lenses with optical power, and at least one of the fourth and fifth lenses in the positioning system has positive optical power. Wherein, the distance TDm between the first side surface of the first lens and the second side surface of the third lens in the visual system on the first optical axis, the distance TDn between the object side surface of the first lens and the image side surface of the fifth lens in the positioning system on the second optical axis, the sum of the air gaps ∑Atm between any two adjacent lenses with optical power among the first to third lenses in the visual system, the sum of the air gaps ∑ATn between any two adjacent lenses with optical power among the first to fifth lenses in the positioning system on the second optical axis, the effective focal length f2m of the second lens in the visual system, the effective focal length fm of the visual system, the refractive index N2m of the second lens in the visual system, the effective focal length f1n of the first lens in the positioning system, the refractive index N1n of the first lens in the positioning system, the radius of curvature R1n of the object side surface of the first lens in the positioning system, and the radius of curvature R2n of the image side surface of the first lens in the positioning system satisfy: 6.0<TDm / ∑ATm+TDn / ∑ATn<14.0,-13.40≤f2m N2m / fm≤-4.47,-2.11≤f1n N1n / (R1n-R2n)≤-0.93。 2. The virtual reality device according to claim 1, characterized in that, The effective focal length fm of the visual system and the effective focal length fn of the positioning system satisfy the following: 25.93≤fm / fn≤34.

34.

3. The virtual reality device according to claim 1, characterized in that, The entrance pupil diameter EPDm of the visual system, the entrance pupil diameter EPDn of the positioning system, the effective focal length fm of the visual system, and the effective focal length fn of the positioning system satisfy the following: 7.44≤fm / EPDm+fn / EPDn≤8.

60.

4. The virtual reality device according to any one of claims 1 to 3, characterized in that, The radius of curvature R2m of the second side surface of the first lens in the visual system, the center thickness CT1m of the first lens on the first optical axis in the visual system, the air gap T12m between the first lens and the second lens on the first optical axis in the visual system, and the center thickness dRPm of the reflective polarizing element on the first optical axis in the visual system satisfy the following: -7.79≤R2m / (CT1m+T12m-dRPm)≤-4.

39.

5. The virtual reality device according to any one of claims 1 to 3, characterized in that, The radius of curvature R4m of the second side surface of the second lens in the visual system, the radius of curvature R5m of the first side surface of the third lens in the visual system, and the air gap T23m between the second and third lenses on the first optical axis in the visual system satisfy the following: 14.61≤|R4m-R5m| / T23m<30.0, or |R4m-R5m| / T23m=32.

70.

6. The virtual reality device according to any one of claims 1 to 3, characterized in that, The radius of curvature R5m of the first side surface of the third lens in the visual system, the radius of curvature R6m of the second side surface of the third lens in the visual system, and the radius of curvature R2m of the second side surface of the first lens in the visual system satisfy the following: -16.07≤|R5m-R6m| / R2m≤-8.

16.

7. The virtual reality device according to any one of claims 1 to 3, characterized in that, The effective focal length fm of the visual system, the sum of the center thicknesses of all lenses in the visual system on the first optical axis ∑CTm, the center thickness dRPm of the reflective polarizing element in the visual system on the first optical axis, and the center thickness dQWPm of the quarter-wave plate in the visual system on the first optical axis satisfy the following: 1.25≤fm / (∑CTm+dRPm+dQWPm)≤1.

37.

8. The virtual reality device according to any one of claims 1 to 3, characterized in that, The air gap T12n between the first and second lenses on the second optical axis in the positioning system, the air gap T23n between the second and third lenses on the second optical axis in the positioning system, and the center thickness CT1n and center thickness CT2n of the first lens on the second optical axis in the positioning system satisfy the following: 6.92≤T12n / CT1n (T23n / CT2n)≤9.23。 9. The virtual reality device according to any one of claims 1 to 3, characterized in that, The effective focal length f4n of the fourth lens in the positioning system, the effective focal length f5n of the fifth lens in the positioning system, the radius of curvature R8n of the image-side surface of the fourth lens in the positioning system, the radius of curvature R9n of the object-side surface of the fifth lens in the positioning system, and the radius of curvature R10n of the image-side surface of the fifth lens in the positioning system satisfy the following: 0.18≤|(f4n+f5n) / (R8n+R9n+R10n)|≤9.

36.

10. The virtual reality device according to any one of claims 1 to 3, characterized in that, The effective focal length f3n of the third lens in the positioning system, the refractive index N3n of the third lens in the positioning system, and the radius of curvature R5n of the object-side surface of the third lens in the positioning system satisfy the following: 1.85 ≤ |f3n N3n / R5n|≤4.37。

Images