Virtual reality devices

Abstract

The application discloses a virtual reality device, which comprises a first optical system and a second optical system. The first optical system comprises, in sequence from the human eye side to the image side along a first optical axis, a reflective polarizing element, a quarter-wave plate, a first lens and a second lens; the second optical system comprises, in sequence from the object side to the image side along a second optical optical axis, a first lens with negative optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens, a fifth lens with positive optical power and a sixth lens with negative optical power; a real image formed by the second optical system is transmitted to a display screen in the form of an electrical signal; the first optical system is used for projecting a virtual image on the display screen and transmitting a real image to the display screen; and the virtual reality device satisfies the condition: 6 < (fA*tan(FOVA / 2)) / (fB*tan(FOVB / 2)) < 8, wherein fA is the effective focal length of the first optical system, fB is the effective focal length of the second optical system, FOVA is the maximum field of view angle of the first optical system, and FOVB is the maximum field of view angle of the second optical system.

Description

Technical Field

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

[0002] With the development of virtual reality technology, more and more functional types and performance boundaries are being explored and optimized. Beyond providing users with immersive virtual images, virtual reality devices increasingly emphasize information complementarity with the real environment and individual interaction. Different types and combinations of optical lenses serve as the basic windows for realizing different visual functions. However, the relatively large size and low image quality resulting from complex functions remain major problems for optical lens assemblies. Therefore, how to improve the user experience of virtual reality devices by optimizing the architecture of multiple optical systems, reducing their size, and enhancing their performance has become one of the most pressing challenges for many optical system designers. Summary of the Invention

[0003] The first aspect of this application provides a virtual reality device. The virtual reality device includes a first optical system and a second optical system. The first optical system, along a first optical axis from the eye side to the image side, sequentially includes a reflective polarizing element, a quarter-wave plate, a first lens, and a second lens, wherein the combination of the reflective polarizing element, the quarter-wave plate, and the first lens has positive optical power, and the second lens has either positive or negative optical power; and the second optical system, along a second optical axis from the object side to the image side, sequentially includes a first lens with negative optical power, a second lens with positive optical power, a third lens with either positive or negative optical power, a fourth lens with either positive or negative optical power, and a fifth lens with positive optical power. The system comprises a first optical system and a second optical system and a sixth lens with negative optical power; wherein the real image formed by the second optical system is transmitted to the display screen in the form of an electrical signal, the first optical system is used to project a virtual image on the display screen and a real image transmitted to the display screen, and the virtual reality device satisfies: 6<(fA×tan(FOVA / 2)) / (fB×tan(FOVB / 2))<8, where fA is the effective focal length of the first optical system, fB is the effective focal length of the second optical system, FOVA is the maximum field of view of the first optical system, and FOVB is the maximum field of view of the second optical system.

[0004] The second aspect of the present application provides such a virtual reality device. The virtual reality device includes a first optical system and a second optical system. The first optical system sequentially includes a reflective polarizing element, a quarter-wave plate, a first lens, and a second lens along the first optical axis from the human eye side to the image side. Among them, the combination of the reflective polarizing element, the quarter-wave plate, and the first lens has a positive optical power, and the second lens has a positive optical power or a negative optical power; and the second optical system sequentially includes a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power or a negative optical power, a fourth lens with a positive optical power or a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power along the second optical axis from the object side to the image side; wherein, the real image formed by the second optical system is transmitted to the display screen in the form of an electrical signal, and the first optical system is used to project the virtual image on the display screen and the real image transmitted to the display screen. The virtual reality device satisfies: -1.8 < (FG1A / fA) × (f1B / fB) < -1.2, where FG1A is the combined focal length of the reflective polarizing element, the quarter-wave plate, and the first lens, fA is the effective focal length of the first optical system, f1B is the effective focal length of the first lens, and fB is the effective focal length of the second optical system.

[0005] In one embodiment, at least one mirror surface from the object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror surface.

[0006] In one embodiment, the virtual reality device satisfies: -15 < R2A / (R1B + R2B) < -3.5, where R2A is the radius of curvature of the near image side surface of the first lens, R1B is the radius of curvature of the object side surface of the first lens, and R2B is the radius of curvature of the image side surface of the first lens.

[0007] In one embodiment, the virtual reality device satisfies: 7.5 < (CT1A + CT2A) / ∑CTB < 8.5, where CT1A is the central thickness of the first lens on the first optical axis, CT2A is the central thickness of the second lens on the first optical axis, T12A is the air gap between the first lens and the second lens on the first optical axis, and ∑CTB is the sum of the central thicknesses of the first lens to the sixth lens on the second optical axis.

[0008] In one embodiment, the virtual reality device satisfies: 2.5 < (CT1A + CTR A + CTQA) / TDB < 3.5, where CT1A is the central thickness of the first lens on the first optical axis, CTR A is the central thickness of the reflective polarizing element on the first optical axis, CTQA is the central thickness of the quarter-wave plate on the first optical axis, and TDB is the distance between the object side surface of the first lens and the image side surface of the sixth lens on the second optical axis.

[0009] In one embodiment, the virtual reality device satisfies: 3 < FG1A / |f1B + f2B + f3B| < 7, where FG1A is the combined focal length of the reflective polarizing element, the quarter-wave plate, and the first lens, f1B is the effective focal length of the first lens, f2B is the effective focal length of the second lens, and f3B is the effective focal length of the third lens.

[0010] In one embodiment, the virtual reality device satisfies: 30 < |FG2A / (f4B + f5B + f6B)| < 40.5, where FG2A is the effective focal length of the second lens, f4B is the effective focal length of the fourth lens, f5B is the effective focal length of the fifth lens, and f6B is the effective focal length of the sixth lens.

[0011] In one embodiment, the virtual reality device satisfies: -5.5 < fA / (f1B + f6B) < -4.5, where fA is the effective focal length of the first optical system, f1B is the effective focal length of the first lens, and f6B is the effective focal length of the sixth lens.

[0012] In one embodiment, the virtual reality device satisfies: 42.5 < |FG1A + FG2A| / fB < 72.5, where FG1A is the combined focal length of the reflective polarizing element, the quarter-wave plate, and the first lens, FG2A is the effective focal length of the second lens, and fB is the effective focal length of the second optical system.

[0013] In one embodiment, the virtual reality device satisfies: 5.3 < CT2A / (R11B + R12B) < 11.3, where CT2A is the central thickness of the second lens on the first optical axis, R11B is the radius of curvature of the object side surface of the sixth lens, and R12B is the radius of curvature of the image side surface of the sixth lens.

[0014] In one embodiment, the virtual reality device satisfies: 0.9 < fA / (CTRA + CTQA + TDA) < 1.3, where fA is the effective focal length of the first optical system, CTRA is the central thickness of the reflective polarizing element on the first optical axis, CTQA is the central thickness of the quarter-wave plate on the first optical axis, and TDA is the distance on the first optical axis from the near-eye side surface of the first lens to the near-image side surface of the second lens.

[0015] In one embodiment, the virtual reality device satisfies: 2.7 mm < (T12B + T56B) × tan(FOVB / 2) < 3.7 mm, where T12B is the air gap between the first lens and the second lens on the second optical axis, T56B is the air gap between the fifth lens and the sixth lens on the second optical axis, and FOVB is the maximum field of view angle of the second optical system.

[0016] In one embodiment, the virtual reality device satisfies: 1.1 < R10B / (R3B + R4B) < 1.6, where R10B is the radius of curvature of the image side of the fifth lens, R3B is the radius of curvature of the object side of the second lens, and R4B is the radius of curvature of the image side of the second lens.

[0017] In one embodiment, the object side of the first lens is convex, and the image side is concave; the object side of the second lens is convex, and the image side is convex; the object side of the sixth lens is concave, and the image side is concave.

[0018] In the exemplary embodiments of the present application, by reasonably setting the architectures of the first optical system and the second optical system, and setting the optical powers and optical technical parameters of each lens and lens, 6 < (fA × tan(FOVA / 2)) / (fB × tan(FOVB / 2)) < 8, the relationship between the screen size of the first optical system and the chip size of the second optical system can be reasonably adjusted, which is beneficial to further improving the viewing angle of the first optical system and enhancing the immersion feeling on the basis of ensuring the image conversion between the two optical systems, and making the overall size of the second optical system smaller under the condition of meeting the design indexes, which is beneficial to the arrangement of the whole machine. By combining the first optical system and the second optical system, the present application can bring the positions and movements of the limbs in the real world into the virtual world to realize the interaction between the virtual world and the real world. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0020] Figure 1 is a schematic structural diagram of a virtual reality device according to an exemplary embodiment of the present application;

[0021] Figure 2A and Figure 2B are respectively schematic structural diagrams of the virtual reality device from the first perspective and the second perspective according to an exemplary embodiment of the present application;

[0022] Figure 3 is a schematic structural diagram of the first optical system in Embodiment 1;

[0023] Figures 4A to 4C respectively show the axial chromatic aberration curve, astigmatism curve, and distortion curve of the first optical system of Embodiment 1;

[0024] Figure 5 is a schematic structural diagram of the first optical system in Embodiment 2;

[0025] Figures 6A to 6CThe on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the first optical system of Embodiment 2 are shown respectively.

[0026] Figure 7 This is a schematic diagram of the structure of the first optical system in Embodiment 3;

[0027] Figures 8A to 8C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the first optical system of Embodiment 3 are shown respectively.

[0028] Figure 9 This is a schematic diagram of the structure of the second optical system in Example 4;

[0029] Figures 10A to 10C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the second optical system of Embodiment 4 are shown respectively.

[0030] Figure 11 This is a schematic diagram of the structure of the second optical system in Embodiment 5;

[0031] Figures 12A to 12C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the second optical system of Embodiment 5 are shown respectively.

[0032] Figure 13 This is a schematic diagram of the structure of the second optical system in Example 6;

[0033] Figures 14A to 14C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the second optical system of Embodiment 6 are shown respectively.

[0034] Figure 15 This is a schematic diagram of the structure of the second optical system in Embodiment 7; and

[0035] Figures 16A to 16C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the second optical system of Embodiment 7 are shown respectively. Detailed Implementation

[0036] 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.

[0037] 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, and the first lens may also be referred to as the second lens or the third lens.

[0038] 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 drawn strictly to scale.

[0039] In this document, the paraxial region refers to the region near the first or second 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 eye side refers to, for example, the side closer to the user's eye, and the image side refers to, for example, the side closer to the display screen, where the display screen may have an image surface. The surface of each lens closest to the eye side is called the eye-side surface of the lens, and the surface of each lens closest to the image side is called the image-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 image surface is called the image-side surface of the lens.

[0040] 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.

[0041] 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.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. For example, the first optical system and the second optical system in the various embodiments of this application can be arbitrarily combined. Specifically, any first optical system in embodiments 1 to 3 can be combined with any second optical system in embodiments 4 to 7. In other words, the virtual reality device provided by this application may include any first optical system in embodiments 1 to 3 and any second optical system in embodiments 4 to 7. The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] The features, principles and other aspects of this application are described in detail below.

[0044] like Figures 1 to 2B As shown, a virtual reality device 100 according to an exemplary embodiment of this application may include a first optical system 110 and a second optical system 120. Exemplarily, the virtual reality device 100 may include two first optical systems 110 and one second optical system 120, wherein the two first optical systems 110 may correspond to the user's left and right eyes, respectively. Exemplarily, as... Figure 1 As shown, the virtual reality device 100 may also include other optical systems, such as an optical system 130 for interacting with reality. It should be understood that this application only exemplifies the number of optical systems in the virtual reality device 100 and does not specifically limit the number of optical systems in the virtual reality device 100.

[0045] The second optical system 120 can capture the user's limb position and movements to form a real image on the imaging surface, wherein the real image formed by the second optical system 120 is transmitted to the display screen in the form of an electrical signal. The image surface of the first optical system 110 can be located on the display screen. The first optical system 110 can be used to project virtual images on the display screen and real images transmitted to the display screen. Specifically, the first optical system 110 can project virtual images on the display screen, such as projecting them into the user's eyes, to enhance the user's sense of immersion. The real image formed by the second optical system 120 can pass through the first optical system 110 through the display screen and be projected out, such as projecting them into the user's eyes, ultimately enabling the user to see a picture that combines virtual and real elements. The virtual reality device 100 provided in this application, by combining the first and second optical systems, can bring the position and movements of limbs in the real world into the virtual world, thereby realizing the interaction between the virtual and real worlds.

[0046] In an exemplary embodiment, the first optical system includes, sequentially from the human eye side to the image side along a first optical axis, a reflective polarizing element, a quarter-wave plate, a first lens, and a second lens. The reflective polarizing element can be attached to the side of the quarter-wave plate closest to the human eye. The quarter-wave plate can be attached to the side of the first lens closest to the human eye. In this application, when light passes through the reflective polarizing element, the reflective polarizing element can reflect light in a certain direction and transmit light orthogonal to the reflected light. The quarter-wave plate can be used to convert between circularly polarized light and linearly polarized light to achieve optical path refraction, which is beneficial for shortening the length of the first optical system.

[0047] In an exemplary embodiment, the first optical system further includes a partially reflective element, which may be attached to the near-image side of the first lens, the near-eye side of the second lens, or the near-image side of the second lens. The partially reflective element is, for example, but not limited to, a semi-transparent, semi-reflective film layer, which may be configured to allow a portion of light to pass through while another portion is reflected.

[0048] In an exemplary embodiment, the first optical system according to this application further includes an aperture stop disposed on the side of the user's eye. The user's eye can view the image projected from the image surface at the position of the aperture stop; that is, the image light on the image surface is finally projected to the user's eye after multiple refractions and reflections through the second lens, the first lens, the quarter-wave plate, and the reflective polarizing element. By reasonably arranging the reflective polarizing element, the quarter-wave plate, the partially reflective element, and multiple lenses such as the first lens and the second lens, this application can reduce the length of the lens group required for projection of the first optical system without affecting the projection quality by utilizing light reflection and / or refraction.

[0049] In an exemplary embodiment, the second optical system includes six lenses with optical power: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. These six lenses are arranged sequentially along the second optical axis from the object side to the image side. Any two adjacent lenses from the first to the sixth lens may have a gap between them.

[0050] In an exemplary embodiment, the first lens may have positive or negative optical power; the second lens may have positive or negative optical power; exemplaryly, the combination of the reflective polarizing element, the quarter-wave plate, and the first lens has positive optical power. The first lens may have negative optical power; the second lens may have positive optical power; the third lens may have positive or negative optical power; the fourth lens may have positive or negative optical power; the fifth lens may have positive optical power; and the sixth lens may have negative optical power.

[0051] In an exemplary embodiment, the virtual reality device according to this application can satisfy 6<(fA×tan(FOVA / 2)) / (fB×tan(FOVB / 2))<8, where fA is the effective focal length of the first optical system, fB is the effective focal length of the second optical system, FOVA is the maximum field of view of the first optical system, and FOVB is the maximum field of view of the second optical system.

[0052] In an exemplary embodiment of this application, the virtual reality device includes a first optical system and a second optical system. The first optical system, along a first optical axis from the eye side to the image side, sequentially includes a reflective polarizing element, a quarter-wave plate, a first lens, and a second lens, wherein the combination of the reflective polarizing element, the quarter-wave plate, and the first lens has positive optical power, and the second lens has either positive or negative optical power. The second optical system, along a second optical axis from the object side to the image side, sequentially includes a first lens with negative optical power, a second lens with positive optical power, a third lens with either positive or negative optical power, a fourth lens with either positive or negative optical power, and a fifth lens with positive optical power. The system comprises a first optical system and a second optical system, and a third optical system and a fourth optical system. The second optical system projects a virtual image onto the display screen and transmits the real image onto the display screen. The virtual reality device satisfies the condition: 6 < (fA × tan(FOVA / 2)) / (fB × tan(FOVB / 2)) < 8, where fA is the effective focal length of the first optical system, fB is the effective focal length of the second optical system, FOVA is the maximum field of view of the first optical system, and FOVB is the maximum field of view of the second optical system. By rationally setting the architecture of the first and second optical systems and setting the optical powers and optical parameters 6 < (fA × tan(FOVA / 2)) / (fB × tan(FOVB / 2)) < 8 for each lens, the relationship between the screen size of the first optical system and the chip size of the second optical system can be reasonably adjusted. This is beneficial for further improving the field of view of the first optical system to enhance the immersive experience while ensuring image conversion between the two optical systems, and for making the overall size of the second optical system smaller while meeting design specifications, which is beneficial for overall device layout. This application combines a first optical system and a second optical system to bring the position and movement of limbs in the real world into the virtual world, thereby realizing the interaction between the virtual world and the real world.

[0053] In an exemplary embodiment, the virtual reality device according to this application can satisfy: -1.8 < (FG1A / fA) × (f1B / fB) < -1.2, where FG1A is the combined focal length of the reflective polarizing element, the quarter-wave plate and the first lens, fA is the effective focal length of the first optical system, f1B is the effective focal length of the first lens and fB is the effective focal length of the second optical system.

[0054] In an exemplary embodiment of the present application, the virtual reality device includes a first optical system and a second optical system. The first optical system sequentially includes a reflective polarizing element, a quarter-wave plate, a first lens, and a second lens along the first optical axis from the human eye side to the image side. Among them, the combination of the reflective polarizing element, the quarter-wave plate, and the first lens has a positive optical power, and the second lens has a positive optical power or a negative optical power; and the second optical system sequentially includes a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power or a negative optical power, a fourth lens with a positive optical power or a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power along the second optical axis from the object side to the image side; wherein, the real image formed by the second optical system is transmitted to the display screen in the form of an electrical signal, and the first optical system is used to project the virtual image on the display screen and the real image transmitted to the display screen. The virtual reality device satisfies: -1.8 < (FG1A / fA) × (f1B / fB) < -1.2, where FG1A is the combined focal length of the reflective polarizing element, the quarter-wave plate, and the first lens, fA is the effective focal length of the first optical system, f1B is the effective focal length of the first lens, and fB is the effective focal length of the second optical system. By reasonably setting the architectures of the first optical system and the second optical system, and setting the optical powers and optical technical parameters of each lens and lens -1.8 < (FG1A / fA) × (f1B / fB) < -1.2, it is beneficial to control the optical power distribution of the lenses and lenses in the first optical system and the second optical system, so as to flexibly perform aberration compensation, and is beneficial to limit the ray height on the basis of ensuring a large field of view of the system, indirectly control the screen and chip sizes, and is beneficial to the overall miniaturization design of the device.

[0055] In an exemplary embodiment, the virtual reality device according to the present application may satisfy: -15 < R2A / (R1B + R2B) < -3.5, where R2A is the curvature radius of the near image side surface of the first lens, R1B is the curvature radius of the object side surface of the first lens, and R2B is the curvature radius of the image side surface of the first lens. Satisfying -15 < R2A / (R1B + R2B) < -3.5 is beneficial to expanding the field of view on the one hand; on the other hand, it can control the light rays in the peripheral field of view, reduce the vignetting in the peripheral field of view, and is beneficial to increasing the light intensity in the peripheral field of view.

[0056] In an exemplary embodiment, the virtual reality device according to the present application may satisfy: 7.5 < (CT1A + CT2A) / ∑CTB < 8.5, where CT1A is the central thickness of the first lens on the first optical axis, CT2A is the central thickness of the second lens on the first optical axis, T12A is the air gap between the first lens and the second lens on the first optical axis, and ∑CTB is the sum of the central thicknesses of the first lens to the sixth lens on the second optical axis. Satisfying 7.5 < (CT1A + CT2A) / ∑CTB < 8.5 is conducive to making the optical system compact while ensuring the molding of the lens by controlling the central thicknesses of the first lens and the second lens on the first optical axis in the first optical system and the sum of the central thicknesses of the first lens to the sixth lens on the second optical axis in the second optical system, thereby controlling the length of the optical system and meeting the requirement of thinning the virtual device.

[0057] In an exemplary embodiment, the virtual reality device according to the present application may satisfy: 2.5 < (CT1A + CTR A + CTQ A) / TDB < 3.5, where CT1A is the central thickness of the first lens on the first optical axis, CTR A is the central thickness of the reflective polarizing element on the first optical axis, CTQ A is the central thickness of the quarter-wave plate on the first optical axis, and TDB is the distance from the object side of the first lens to the image side of the sixth lens on the second optical axis. Satisfying 2.5 < (CT1A + CTR A + CTQ A) / TDB < 3.5 further compresses the height of the virtual reality device on the basis of indirectly controlling the total optical length of the first optical system and the second optical system, which is conducive to the miniaturization of the virtual reality device.

[0058] In an exemplary embodiment, the virtual reality device according to the present application may satisfy: 3 < FG1A / |f1B + f2B + f3B| < 7, where FG1A is the combined focal length of the reflective polarizing element, the quarter-wave plate and the first lens, f1B is the effective focal length of the first lens, f2B is the effective focal length of the second lens, and f3B is the effective focal length of the third lens. Satisfying 3 < FG1A / |f1B + f2B + f3B| < 7 reasonably balances the refractive power of the first optical system and the second optical system and the optical power of the second optical system by controlling the ratio of the combined focal length of the reflective polarizing element, the quarter-wave plate and the first lens in the first optical system to the sum of the effective focal lengths of the first lens, the second lens and the third lens in the second optical system, which is conducive to controlling the image conversion and field-of-view connection between the two optical systems.

[0059] In an exemplary embodiment, the virtual reality device according to the present application may satisfy: 30 < |FG2A / (f4B + f5B + f6B)| < 40.5, where FG2A is the effective focal length of the second lens, f4B is the effective focal length of the fourth lens, f5B is the effective focal length of the fifth lens, and f6B is the effective focal length of the sixth lens. Satisfying 30 < |FG2A / (f4B + f5B + f6B)| < 40.5, by controlling the ratio of the effective focal length of the second lens in the first optical system to the sum of the effective focal lengths of the fourth, fifth, and sixth lenses in the second optical system, on the one hand, it is beneficial for the second lens in the first optical system to compress the light height and reduce the screen size, and on the other hand, it is beneficial for the focal length distribution of the second optical system and reduces the chip size.

[0060] In an exemplary embodiment, the virtual reality device according to the present application may satisfy: -5.5 < fA / (f1B + f6B) < -4.5, where fA is the effective focal length of the first optical system, f1B is the effective focal length of the first lens, and f6B is the effective focal length of the sixth lens. Satisfying -5.5 < fA / (f1B + f6B) < -4.5, by controlling the ratio of the effective focal length of the first optical system to the sum of the effective focal lengths of the first and sixth lenses in the second optical system, the refractive power and optical power of the second optical system are reasonably balanced.

[0061] In an exemplary embodiment, the virtual reality device according to the present application may satisfy: 42.5 < |FG1A + FG2A| / fB < 72.5, where FG1A is the combined focal length of the reflective polarizing element, quarter-wave plate, and first lens, FG2A is the effective focal length of the second lens, and fB is the effective focal length of the second optical system. Satisfying 42.5 < |FG1A + FG2A| / fB < 72.5 can indirectly control the F-number of the second optical system, making the light flux of the second optical system larger and ensuring the spatial positioning function of the second optical system in a dark environment.

[0062] In an exemplary embodiment, the virtual reality device according to the present application may satisfy: 5.3 < CT2A / (R11B + R12B) < 11.3, where CT2A is the central thickness of the second lens on the first optical axis, R11B is the curvature radius of the object side surface of the sixth lens, and R12B is the curvature radius of the image side surface of the sixth lens. Satisfying 5.3 < CT2A / (R11B + R12B) < 11.3, on the one hand, it is beneficial for the shaping of the lenses in the two optical systems, and on the other hand, it can effectively control the refraction angle of the light beam, thus meeting the CRA requirements of the two optical systems.

[0063] In an exemplary embodiment, the virtual reality device according to the present application may satisfy: 0.9 < fA / (CTRA + CTQA + TDA) < 1.3, where fA is the effective focal length of the first optical system, CTRA is the central thickness of the reflective polarizing element on the first optical axis, CTQA is the central thickness of the quarter-wave plate on the first optical axis, and TDA is the distance on the first optical axis from the near-eye side of the first lens to the near-image side of the second lens. Satisfying 0.9 < fA / (CTRA + CTQA + TDA) < 1.3, by controlling the ratio of the effective focal length of the first optical system to the sum of the central thicknesses of the reflective polarizing element, the quarter-wave plate, and the distance on the first optical axis from the near-eye side of the first lens to the near-image side of the second lens, it is beneficial to meet the design requirements of the short focal length and wide angle of the first optical system, and ensure the thickness of the polarizing element, which is beneficial for actual processing and film layer attachment.

[0064] In an exemplary embodiment, the virtual reality device according to the present application may satisfy: 2.7 mm < (T12B + T56B) × tan(FOVB / 2) < 3.7 mm, where T12B is the air gap between the first lens and the second lens on the second optical axis, T56B is the air gap between the fifth lens and the sixth lens on the second optical axis, and FOVB is the maximum field of view angle of the second optical system. Satisfying 2.7 mm < (T12B + T56B) × tan(FOVB / 2) < 3.7 mm, by controlling the product of the air gaps between the first lens and the second lens and between the fifth lens and the sixth lens in the second optical system and the maximum half field of view angle of the second optical system, the second optical system can obtain a larger field of view while avoiding assembly interference.

[0065] In an exemplary embodiment, the virtual reality device according to the present application may satisfy: 1.1 < R10B / (R3B + R4B) < 1.6, where R10B is the radius of curvature of the image side of the fifth lens, R3B is the radius of curvature of the object side of the second lens, and R4B is the radius of curvature of the image side of the second lens. Satisfying 1.1 < R10B / (R3B + R4B) < 1.6, by controlling the ratio of the radius of curvature of the image side of the fifth lens in the second optical system to the sum of the radii of curvature of the object side and the image side of the second lens, it is beneficial to control the light rays in the edge field of view, reduce the vignetting in the edge field of view, and increase the light intensity in the edge field of view.

[0066] In an exemplary embodiment, the object-side surface of the first lens is convex, and the image-side surface is concave; the object-side surface of the second lens is convex, and the image-side surface is convex; the object-side surface of the sixth lens is concave, and the image-side surface is concave. This application controls the shape of the first lens so that its object-side surface is convex and its image-side surface is concave, and its optical power is negative, which helps to increase the field of view. The object-side surface and image-side surface of the second lens are both convex, making its optical power positive, which can effectively converge light and reduce the boundary effect of the virtual reality device. Simultaneously, controlling the sides of the sixth lens to be concave further increases the field of view.

[0067] In an exemplary embodiment, the second optical system according to this application may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the image side. The second optical system according to the above embodiments of this application may employ multiple lenses, such as the six lenses mentioned above. By rationally allocating the structure of each lens and the on-axis spacing between them, the size of the second optical system can be effectively reduced and its manufacturability improved, making the second optical system more conducive to manufacturing and suitable for portable electronic products.

[0068] In embodiments of this application, at least one of the mirror surfaces of each lens and / or lens is an aspherical mirror surface. That is, at least one mirror surface from the near-eye side of the first lens to the near-image side of the second lens is an aspherical mirror surface, and at least one mirror surface from the object side of the first lens to the image side of the sixth lens is an aspherical mirror surface. The characteristic of aspherical lenses and / or lenses is that the curvature changes continuously from the center to the periphery of the lens and / or lens. Unlike spherical lenses and / or lenses, which have a constant curvature from the center to the periphery, aspherical lenses and / or lenses have better radius of curvature characteristics, offering advantages in improving distortion aberrations and astigmatism. By using aspherical lenses and / or lenses, aberrations occurring during imaging or projection can be eliminated as much as possible, thereby improving imaging or projection quality. Optionally, at least one of the near-eye side and near-image side of the first and second lenses is an aspherical mirror, and the object side and image side of each of the first, second, third, fourth, fifth, and sixth lenses are aspherical mirrors.

[0069] However, those skilled in the art will understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the first optical system and the number of lenses constituting the second optical system can be changed to obtain the various results and advantages described in this specification. For example, although the embodiments are described with the first optical system comprising two lenses and the second optical system comprising six lenses as examples, the first optical system is not limited to comprising two lenses and the second optical system is not limited to comprising six lenses. If necessary, the first optical system and / or the second optical system may also include other numbers of lenses.

[0070] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the first or second optical system applicable to the above-described embodiments.

[0071] Example 1

[0072] The following is for reference Figures 3 to 4C A first optical system in a virtual reality device according to Embodiment 1 of this application is described. It should be understood that the second optical system in the virtual reality device may be any of the second optical systems provided in Embodiments 4 to 7 below. Figure 3 This is a schematic diagram of the structure of the first optical system in Embodiment 1.

[0073] like Figure 3 As shown, the first optical system includes, in sequence from the human eye side to the image side: aperture STO, reflective polarizing element RP, quarter-wave plate QWP, first lens L1, partial reflective element BS, second lens L2, and image plane IMG.

[0074] The first lens L1 has a flat surface on the side closest to the human eye and a convex surface on the side closest to the image. The second lens L2 has a convex surface on the side closest to the human eye and a concave surface on the side closest to the image. A reflective polarizing element RP is attached to the side closest to the human eye of a quarter-wave plate QWP. The quarter-wave plate QWP is attached to the side closest to the human eye of the first lens L1. A partially reflective element BS is attached to the side closest to the image of the first lens L1.

[0075] In this example, image light from the image plane IMG sequentially passes through the second lens L2, the first lens L1, the quarter-wave plate QWP, and reaches the reflective polarizer RP, where it undergoes a first reflection. The light after the first reflection passes through the quarter-wave plate QWP, the first lens L1, and reaches the partial reflective element BS on the near-image side of the first lens L1, where it undergoes a second reflection. The light after the second reflection sequentially passes through the first lens L1, the quarter-wave plate QWP, the reflective polarizer RP, and the aperture stop STO, and is finally projected onto a target object (not shown) in space. For example, when this virtual reality device is mounted on an electronic device such as VR, the light after the two reflections is ultimately projected into the eyes of the user.

[0076] Table 1 shows the basic parameters of the first optical system of Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm). Image light from the image plane IMG passes through the components in the order of number 14 to number 1 and is finally projected onto the target object in space, such as the human eye.

[0077]

[0078]

[0079] Table 1

[0080] In this example, the combined focal length FG1A of the reflective polarizing element, the quarter-wave plate, and the first lens is 26.96 mm; the effective focal length FG2A of the second lens is 122.26 mm; the effective focal length fA of the first optical system is 25.20 mm; the maximum field of view FOVA of the first optical system is 106.00°; the distance TDA on the first optical axis from the near-eye side of the first lens to the near-image side of the second lens is 22.00 mm; the center thickness CTRA of the reflective polarizing element on the first optical axis is 0.18 mm, and the center thickness CTQA of the quarter-wave plate on the first optical axis is 0.18 mm.

[0081] In Example 1, the near-image side of the first lens L1, the near-eye side of the second lens, and the near-image side are aspherical. The surface shape x of the aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0082]

[0083] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the first 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 below gives the higher-order coefficients A4, A6, A8, A... that can be used for each aspherical mirror in Example 1. 10 A 12 A 14 A 16 A 18 and A 20 .

[0084]

[0085]

[0086] Table 2

[0087] Figure 4A The on-axis chromatic aberration curve of the first optical system of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the first optical system. Figure 4B The astigmatism curves of the first optical system of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 4C The distortion curves of the first optical system of Embodiment 1 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 4A to 4C It can be seen that the first optical system given in Example 1 can achieve good projection quality.

[0088] Example 2

[0089] The following is for reference Figures 5 to 6C The first optical system in the virtual reality device according to Embodiment 2 of this application is described. It should be understood that the second optical system in the virtual reality device can be any of the second optical systems provided in Embodiments 4 to 7 below. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 5 This is a schematic diagram of the structure of the first optical system in Embodiment 2.

[0090] like Figure 5 As shown, the first optical system includes, in sequence from the human eye side to the image side: aperture STO, reflective polarizing element RP, quarter-wave plate QWP, first lens L1, partial reflective element BS, second lens L2, and image plane IMG.

[0091] The first lens L1 has a concave surface on the side closest to the human eye and a convex surface on the side closest to the image. The second lens L2 has a convex surface on both the side closest to the human eye and the side closest to the image. A reflective polarizing element RP is attached to the side closest to the human eye of a quarter-wave plate QWP. The quarter-wave plate QWP is attached to the side closest to the human eye of the first lens L1. A partially reflective element BS is attached to the side closest to the image of the first lens L1.

[0092] In this example, image light from the image plane IMG sequentially passes through the second lens L2, the first lens L1, the quarter-wave plate QWP, and reaches the reflective polarizer RP, where it undergoes a first reflection. The light after the first reflection passes through the quarter-wave plate QWP, the first lens L1, and reaches the partial reflective element BS on the near-image side of the first lens L1, where it undergoes a second reflection. The light after the second reflection sequentially passes through the first lens L1, the quarter-wave plate QWP, the reflective polarizer RP, and the aperture stop STO, and is finally projected onto a target object (not shown) in space. For example, when this virtual reality device is mounted on an electronic device such as VR, the light after the two reflections is ultimately projected into the eyes of the user.

[0093] In this example, the combined focal length FG1A of the reflective polarizing element, the quarter-wave plate, and the first lens is 26.96 mm; the effective focal length FG2A of the second lens is -115.49 mm; the effective focal length fA of the first optical system is 25.34 mm; the maximum field of view FOVA of the first optical system is 100.00°; the distance TDA on the first optical axis from the near-eye side of the first lens to the near-image side of the second lens is 22.88 mm; the center thickness CTRA of the reflective polarizing element on the first optical axis is 0.18 mm, and the center thickness CTQA of the quarter-wave plate on the first optical axis is 0.18 mm.

[0094] Table 3 shows the basic parameters of the first optical system in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm). Image light from the image plane IMG passes through each component in the order of number 14 to number 1 and is finally projected onto the target object in space, such as the human eye. Table 4 gives the higher-order coefficients that can be used for each aspherical mirror in Embodiment 2.

[0095]

[0096] Table 3

[0097]

[0098] Table 4

[0099] Figure 6AThe on-axis chromatic aberration curve of the first optical system of Embodiment 2 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the first optical system. Figure 6B The astigmatism curves of the first optical system of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 6C The distortion curves of the first optical system in Embodiment 2 are shown, representing the distortion magnitudes corresponding to different field of view angles. According to... Figures 6A to 6C It can be seen that the first optical system given in Example 2 can achieve good projection quality.

[0100] Example 3

[0101] The following is for reference Figures 7 to 8C The first optical system in a virtual reality device according to Embodiment 3 of this application is described. It should be understood that the second optical system in the virtual reality device may be any of the second optical systems provided in Embodiments 4 to 7 below. Figure 7 This is a schematic diagram of the structure of the first optical system in Embodiment 3.

[0102] like Figure 7 As shown, the first optical system includes, in sequence from the human eye side to the image side: aperture STO, reflective polarizing element RP, quarter-wave plate QWP, first lens L1, partial reflective element BS, second lens L2, and image plane IMG.

[0103] The first lens L1 has a concave surface on the side closest to the human eye and a convex surface on the side closest to the image. The second lens L2 has a concave surface on the side closest to the human eye and a convex surface on the side closest to the image. A reflective polarizing element RP is attached to the side closest to the human eye of a quarter-wave plate QWP. The quarter-wave plate QWP is attached to the side closest to the human eye of the first lens L1. A partially reflective element BS is attached to the side closest to the image of the first lens L1.

[0104] In this example, image light from the image plane IMG sequentially passes through the second lens L2, the first lens L1, the quarter-wave plate QWP, and reaches the reflective polarizer RP, where it undergoes a first reflection. The light after the first reflection passes through the quarter-wave plate QWP, the first lens L1, and reaches the partial reflective element BS on the near-image side of the first lens L1, where it undergoes a second reflection. The light after the second reflection sequentially passes through the first lens L1, the quarter-wave plate QWP, the reflective polarizer RP, and the aperture stop STO, and is finally projected onto a target object (not shown) in space. For example, when this virtual reality device is mounted on an electronic device such as VR, the light after the two reflections is ultimately projected into the eyes of the user.

[0105] In this example, the combined focal length FG1A of the reflective polarizing element, the quarter-wave plate, and the first lens is 26.50 mm; the effective focal length FG2A of the second lens is -121.17 mm; the effective focal length fA of the first optical system is 25.33 mm; the maximum field of view FOVA of the first optical system is 100.00°; the distance TDA on the first optical axis from the near-eye side of the first lens to the near-image side of the second lens is 22.30 mm; the center thickness CTRA of the reflective polarizing element on the first optical axis is 0.18 mm, and the center thickness CTQA of the quarter-wave plate on the first optical axis is 0.18 mm.

[0106] Table 5 shows the basic parameters of the first optical system in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm). Image light from the image plane IMG passes through the components in the order of number 14 to number 1 and is finally projected onto the target object in space, such as the human eye. Table 6 gives the higher-order coefficients that can be used for the aspherical mirrors in Embodiment 3.

[0107]

[0108]

[0109] Table 5

[0110]

[0111] Table 6

[0112] Figure 8A The on-axis chromatic aberration curve of the first optical system of Embodiment 3 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the first optical system. Figure 8B The astigmatism curves of the first optical system of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 8C The distortion curves of the first optical system in Embodiment 3 are shown, representing the distortion magnitudes corresponding to different field of view angles. According to... Figures 8A to 8C It can be seen that the first optical system given in Example 3 can achieve good projection quality.

[0113] Example 4

[0114] The following is for reference Figures 9 to 10C The second optical system in a virtual reality device according to Embodiment 4 of this application is described. It should be understood that the first optical system in this virtual reality device can be any of the first optical systems provided in Embodiments 1 to 3 above. Figure 9 A schematic diagram of the structure of a second optical system according to Embodiment 4 of this application is shown.

[0115] like Figure 9As shown, the second optical system includes, in sequence from the object side to the image side: a first lens E1, an aperture stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0116] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0117] Table 1 shows the basic parameters of the second optical system of Embodiment 1, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm).

[0118]

[0119] Table 7

[0120] In this example, the effective focal length fB of the second optical system is 2.08 mm, the maximum field of view FOVB of the second optical system is 130.04°, the distance TDB between the object side of the first lens and the image side of the sixth lens on the second optical axis is 4.58 mm, and the sum of the center thicknesses of the first lens to the sixth lens on the second optical axis, ∑CTB, is 2.70 mm.

[0121] In embodiment 4, the object-side surface and image-side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0122]

[0123] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the second 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 below gives the higher-order coefficients A4, A6, A8, A12 that can be used for each aspherical mirror S1-S12 in Example 4. 10 A 12 A 14 and A16 .

[0124]

[0125]

[0126] Table 8

[0127] Figure 10A The on-axis chromatic aberration curve of the second optical system of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system. Figure 10B The astigmatism curves of the second optical system of Embodiment 4 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 10C The distortion curves of the second optical system in Embodiment 4 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 10A to 10C It can be seen that the second optical system given in Example 4 can achieve good imaging quality.

[0128] Example 5

[0129] The following is for reference Figures 11 to 12C The second optical system in a virtual reality device according to Embodiment 5 of this application is described. It should be understood that the first optical system in this virtual reality device can be any of the first optical systems provided in Embodiments 1 to 3 above. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 4 will be omitted. Figure 11 A schematic diagram of the structure of a second optical system according to Embodiment 5 of this application is shown.

[0130] like Figure 11 As shown, the second optical system includes, in sequence from the object side to the image side: a first lens E1, an aperture stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0131] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0132] In this example, the effective focal length fB of the second optical system is 2.08 mm, the maximum field of view FOVB of the second optical system is 130.03°, the distance TDB between the object side of the first lens and the image side of the sixth lens on the second optical axis is 4.58 mm, and the sum of the center thicknesses ∑CTB of the first lens to the sixth lens on the second optical axis is 2.83 mm.

[0133] Table 9 shows the basic parameters of the second optical system in Example 5, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm). Table 10 gives the higher-order coefficients that can be used for each aspherical mirror S1-S12 in Example 5.

[0134]

[0135]

[0136] Table 9

[0137] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.9148E-02 -2.7769E-02 7.8505E-03 6.4953E-03 -6.1509E-03 1.9591E-03 -2.2629E-04 S2 8.9940E-03 1.1417E-01 -1.0871E-01 -4.0774E-01 1.7844E+00 -2.2748E+00 1.0847E+00 S3 -2.7367E-02 9.6631E-02 -8.3434E-01 2.6383E+00 -4.6587E+00 4.2075E+00 -1.5837E+00 S4 -1.3157E-01 5.1854E-02 -4.4191E-01 1.4787E+00 -2.0125E+00 1.2534E+00 -3.0177E-01 S5 -2.9236E-01 8.1080E-01 -3.1915E+00 6.6097E+00 -7.3968E+00 4.3036E+00 -1.0232E+00 S6 -2.6548E-01 1.5373E+00 -4.2813E+00 6.7295E+00 -6.0756E+00 2.9684E+00 -6.0777E-01 S7 -1.6551E-01 5.1091E-01 -7.9355E-01 5.5945E-01 -1.4156E-01 1.7841E-02 -9.6757E-03 S8 -1.1761E-01 -2.4183E-01 4.8083E-01 -3.2036E-01 -5.2476E-02 1.6609E-01 -5.0943E-02 S9 1.2184E-01 -4.6127E-01 5.5739E-01 -2.6243E-01 -3.3659E-02 8.3198E-02 -2.4343E-02 S10 -4.7643E-02 1.3275E-01 -4.1622E-01 6.9424E-01 -5.6626E-01 2.2478E-01 -3.5021E-02 S11 -1.4284E-01 -9.2956E-02 2.9412E-01 -2.1082E-01 4.2042E-02 1.4448E-02 -5.0986E-03 S12 -2.6446E-01 1.4930E-01 -5.7894E-02 1.4272E-02 -5.3630E-03 2.3216E-03 -4.1956E-04

[0138] Table 10

[0139] Figure 12A The on-axis chromatic aberration curve of the second optical system of Embodiment 5 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system. Figure 12B The astigmatism curves of the second optical system of Embodiment 5 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 12C The distortion curves of the second optical system in Embodiment 5 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 12A to 12C It can be seen that the second optical system given in Example 5 can achieve good imaging quality.

[0140] Example 6

[0141] The following is for reference Figures 13 to 14C The second optical system in a virtual reality device according to Embodiment 6 of this application is described. It should be understood that the first optical system in this virtual reality device can be any of the first optical systems provided in Embodiments 1 to 3 above. Figure 13 A schematic diagram of the structure of a second optical system according to Embodiment 6 of this application is shown.

[0142] like Figure 13 As shown, the second optical system includes, in sequence from the object side to the image side: a first lens E1, an aperture stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

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

[0144] In this example, the effective focal length fB of the second optical system is 2.08 mm, the maximum field of view FOVB of the second optical system is 130.08°, the distance TDB between the object side of the first lens and the image side of the sixth lens on the second optical axis is 4.52 mm, and the sum of the center thicknesses of the first lens to the sixth lens on the second optical axis, ∑CTB, is 2.85 mm.

[0145] Table 11 shows the basic parameters of the second optical system of Example 6, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm). Table 12 gives the higher-order coefficients that can be used for each aspherical mirror S1-S12 in Example 6.

[0146]

[0147] Table 11

[0148]

[0149]

[0150] Table 12

[0151] Figure 14A The on-axis chromatic aberration curve of the second optical system of Embodiment 6 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system. Figure 14B The astigmatism curves of the second optical system of Embodiment 6 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 14C The distortion curves of the second optical system in Embodiment 6 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 14A to 14C It can be seen that the second optical system given in Example 6 can achieve good imaging quality.

[0152] Example 7

[0153] The following is for reference Figures 15 to 16CThe second optical system in a virtual reality device according to Embodiment 7 of this application is described. It should be understood that the first optical system in this virtual reality device can be any of the first optical systems provided in Embodiments 1 to 3 above. Figure 15 A schematic diagram of the structure of a second optical system according to Embodiment 7 of this application is shown.

[0154] like Figure 15 As shown, the second optical system includes, in sequence from the object side to the image side: a first lens E1, an aperture stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0155] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0156] In this example, the effective focal length fB of the second optical system is 2.08 mm, the maximum field of view FOVB of the second optical system is 130.01°, the distance TDB between the object side of the first lens and the image side of the sixth lens on the second optical axis is 4.59 mm, and the sum of the center thicknesses of the first lens to the sixth lens on the second optical axis, ∑CTB, is 2.72 mm.

[0157] Table 13 shows the basic parameters of the second optical system in Example 7, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm). Table 14 gives the higher-order coefficients that can be used for each aspherical mirror S1-S12 in Example 7.

[0158]

[0159]

[0160] Table 13

[0161] Face number A4 A6 A8 A10 A12 A14 A16 S1 7.5887E-03 -1.7130E-02 7.4595E-03 3.8535E-03 -5.3059E-03 2.0347E-03 -2.7219E-04 S2 7.8517E-02 -1.2575E-01 7.7041E-01 -2.3239E+00 4.0801E+00 -3.6416E+00 1.3468E+00 S3 -2.4704E-02 2.7609E-02 -3.7068E-01 1.0432E+00 -1.7148E+00 1.4439E+00 -5.2895E-01 S4 -8.0427E-02 -1.0804E-01 -1.9391E-01 1.1513E+00 -1.6314E+00 9.8870E-01 -2.2806E-01 S5 -2.9455E-01 7.9995E-01 -3.0975E+00 6.0917E+00 -6.3764E+00 3.4653E+00 -7.7278E-01 S6 -1.9388E-01 1.1210E+00 -3.1683E+00 4.8531E+00 -4.1726E+00 1.9367E+00 -3.7969E-01 S7 -7.7450E-02 9.9294E-02 6.1611E-02 -6.0148E-01 8.8645E-01 -4.9832E-01 9.9316E-02 S8 6.1741E-02 -7.8135E-01 1.2150E+00 -8.6289E-01 2.7553E-01 -1.0065E-02 -6.4964E-03 S9 1.6078E-01 -6.5052E-01 4.5306E-01 5.2481E-01 -9.0612E-01 4.7171E-01 -8.7235E-02 S10 -2.9990E-02 4.0891E-02 -3.0933E-01 5.8714E-01 -4.4380E-01 1.4261E-01 -1.4748E-02 S11 -1.7737E-01 -1.5765E-03 2.1500E-01 -2.0450E-01 7.6347E-02 -6.6406E-03 -1.2598E-03 S12 -2.9377E-01 2.1673E-01 -1.2184E-01 4.9745E-02 -1.5595E-02 3.4638E-03 -4.0341E-04

[0162] Table 14

[0163] Figure 16AThe on-axis chromatic aberration curve of the second optical system of Embodiment 7 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system. Figure 16B The astigmatism curves of the second optical system of Embodiment 7 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 16C The distortion curves of the second optical system in Embodiment 7 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 16A to 16C It can be seen that the second optical system given in Example 7 can achieve good imaging quality.

[0164] In summary, in one embodiment of this application, the virtual reality device may include the first optical system of embodiment 1 and the second optical system of embodiment 4. In another embodiment of this application, the virtual reality device may include the first optical system of embodiment 1 and the second optical system of embodiment 5. In another embodiment of this application, the virtual reality device may include the first optical system of embodiment 1 and the second optical system of embodiment 6. In another embodiment of this application, the virtual reality device may include the first optical system of embodiment 1 and the second optical system of embodiment 7. In another embodiment of this application, the virtual reality device may include the first optical system of embodiment 2 and the second optical system of embodiment 4. In another embodiment of this application, the virtual reality device may include the first optical system of embodiment 2 and the second optical system of embodiment 5. In another embodiment of this application, the virtual reality device may include the first optical system of embodiment 2 and the second optical system of embodiment 6. In another embodiment of this application, the virtual reality device may include the first optical system of embodiment 2 and the second optical system of embodiment 7. In another embodiment of this application, the virtual reality device may include the first optical system of embodiment 3 and the second optical system of embodiment 4. In another embodiment of this application, the virtual reality device may include the first optical system of embodiment 3 and the second optical system of embodiment 5. In another embodiment of this application, the virtual reality device may include the first optical system of embodiment 3 and the second optical system of embodiment 6. In another embodiment of this application, the virtual reality device may include the first optical system in embodiment 3 and the second optical system in embodiment 7.

[0165] The above 12 virtual reality devices satisfy the relationships shown in Tables 15-1, 15-2, and 15-3, respectively.

[0166] Conditional / Example Combination 1+4 1+5 1+6 1+7 (fA×tan(FOVA / 2)) / (fB×tan(FOVB / 2)) 7.49 7.49 7.52 7.50 (FG1A / fA)×(f1B / fB) -1.65 -1.60 -1.62 -1.59 R2A / (R1B+R2B) -11.83 -14.91 -6.33 -4.53 (CT1A+CT2A) / ∑CTB 8.11 7.75 7.67 8.06 (CT1A+CTRA+CTQA) / TDB 3.35 3.35 3.39 3.34 FG1A / |f1B+f2B+f3B| 6.94 6.77 3.32 6.70 |FG2A / (f4B+f5B+f6B)| 39.34 39.99 31.98 34.81 fA / (f1B+f6B) -4.99 -5.06 -5.31 -5.08 |FG1A+FG2A| / fB 71.74 71.74 72.09 71.74 CT2A / (R11B+R12B) 5.47 6.00 7.91 6.03 fA / (CTRA+CTQA+TDA) 1.13 1.13 1.13 1.13 (T12B+T56B)×tan(FOVB / 2)(mm) 3.36 3.12 2.93 3.45 R10B / (R3B+R4B) 1.52 1.56 1.18 1.39

[0167] Table 15-1

[0168] Conditional / Example Combination 2+4 2+5 2+6 2+7 (fA×tan(FOVA / 2)) / (fB×tan(FOVB / 2)) 6.76 6.76 6.79 6.77 (FG1A / fA)×(f1B / fB) -1.62 -1.57 -1.59 -1.57 R2A / (R1B+R2B) -11.78 -14.86 -6.30 -4.51 (CT1A+CT2A) / ∑CTB 8.43 8.06 7.98 8.38 (CT1A+CTRA+CTQA) / TDB 2.99 2.99 3.02 2.98 FG1A / |f1B+f2B+f3B| 6.87 6.71 3.29 6.64 |FG2A / (f4B+f5B+f6B)| 37.16 37.77 30.21 32.88 fA / (f1B+f6B) -5.02 -5.09 -5.34 -5.11 |FG1A+FG2A| / fB 42.69 42.69 42.90 42.69 CT2A / (R11B+R12B) 7.47 8.20 10.81 8.23 fA / (CTRA+CTQA+TDA) 1.09 1.09 1.09 1.09 (T12B+T56B)×tan(FOVB / 2)(mm) 3.36 3.12 2.93 3.45 R10B / (R3B+R4B) 1.52 1.56 1.18 1.39

[0169] Table 15-2

[0170]

[0171]

[0172] Table 15-3

[0173] 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 apparatus, characterized by, Comprise: a first optical system comprising, in order from a human eye side to an image side along a first optical axis, a reflective polarizing element, a quarter-wave plate, a first lens, and a second lens, wherein a combination of the reflective polarizing element, the quarter-wave plate, and the first lens has positive refractive power, and the second lens has positive refractive power or negative refractive power; and a second optical system comprising, in order from an object side to an image side along a second optical axis, a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive refractive power or negative refractive power, a fourth lens having positive refractive power or negative refractive power, a fifth lens having positive refractive power, and a sixth lens having negative refractive power; wherein a real image formed by the second optical system is transmitted to a display screen in the form of an electric signal, the first optical system is used for projecting a virtual image on the display screen and transmitting the real image to the display screen, and the virtual reality device satisfies 6.76≤(fA×tan(FOVA / 2)) / (fB×tan(FOVB / 2))≤7.52, where fA is an effective focal length of the first optical system, fB is an effective focal length of the second optical system, FOVA is a maximum field of view angle of the first optical system, and FOVB is a maximum field of view angle of the second optical system; the virtual reality device satisfies 2.93mm≤(T12B+T56B)×tan(FOVB / 2)≤3.45mm, where T12B is an air interval of the first lens and the second lens on the second optical axis, T56B is an air interval of the fifth lens and the sixth lens on the second optical axis, and FOVB is a maximum field of view angle of the second optical system; the virtual reality device satisfies 1.18≤R10B / (R3B+R4B)<1.6, where R10B is a curvature radius of an image side surface of the fifth lens, R3B is a curvature radius of an object side surface of the second lens, and R4B is a curvature radius of an image side surface of the second lens; a number of lenses having refractive power in the first optical system is two; a number of lenses having refractive power in the second optical system is six; an object side surface of the first lens is a convex surface, and an image side surface is a concave surface; an object side surface of the second lens is a convex surface, and an image side surface is a convex surface; an image side surface of the fifth lens is a convex surface; an object side surface of the sixth lens is a concave surface, and an image side surface is a concave surface; a positive or negative attribute of refractive power of the third lens and the fourth lens is opposite; the first optical system further comprises a partial reflection element attached to a proximal image side surface of the first lens.

2. The virtual reality device of claim 1, wherein, the virtual reality device satisfies -14.91≤R2A / (R1B+R2B)≤-3.79, where R2A is a curvature radius of a proximal image side surface of the first lens, R1B is a curvature radius of an object side surface of the first lens, and R2B is a curvature radius of an image side surface of the first lens.

3. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 7.67 ≤ (CT1A + CT2A) / ∑CTB ≤ 8.43, where CT1A is the center thickness of the first lens on the first optical axis, CT2A is the center thickness of the second lens on the first optical axis, T12A is the air gap of the first lens and the second lens on the first optical axis, and ∑CTB is the sum of the center thicknesses of the first lens to the sixth lens on the second optical axis.

4. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 2.77 ≤ (CT1A + CTRA + CTQA) / TDB ≤ 3.39, where CT1A is the center thickness of the first lens on the first optical axis, CTRA is the center thickness of the reflective polarizing element on the first optical axis, CTQA is the center thickness of the quarter-wave plate on the first optical axis, and TDB is the distance from the object side of the first lens to the image side of the sixth lens on the second optical axis.

5. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 3.26 ≤ FG1A / |f1B + f2B + f3B| ≤ 6.94, where FG1A is the combined focal length of the reflective polarizing element, the quarter-wave plate, and the first lens, f1B is the effective focal length of the first lens, f2B is the effective focal length of the second lens, and f3B is the effective focal length of the third lens.

6. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 30.21 ≤ |FG2A / (f4B + f5B + f6B)| ≤ 39.99, where FG2A is the effective focal length of the second lens, f4B is the effective focal length of the fourth lens, f5B is the effective focal length of the fifth lens, and f6B is the effective focal length of the sixth lens.

7. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: -5.34 ≤ fA / (f1B + f6B) ≤ -4.99, where fA is the effective focal length of the first optical system, f1B is the effective focal length of the first lens, and f6B is the effective focal length of the sixth lens.

8. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 42.69 ≤ |FG1A + FG2A| / fB ≤ 72.09, where FG1A is the combined focal length of the reflective polarizing element, the quarter-wave plate, and the first lens, FG2A is the effective focal length of the second lens, and fB is the effective focal length of the second optical system.

9. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 5.47 ≤ CT2A / (R11B + R12B) < 11.3, where CT2A is the center thickness of the second lens on the first optical axis, R11B is the radius of curvature of the object side of the sixth lens, and R12B is the radius of curvature of the image side of the sixth lens.

10. The virtual reality apparatus of any one of claims 1-9, wherein, The virtual reality device satisfies: 1.09 ≤ fA / (CTRA+CTQA+TDA) ≤ 1.13, where fA is an effective focal length of the first optical system, CTRA is a central thickness of the reflective polarizing element on the first optical axis, CTQA is a central thickness of the quarter-wave plate on the first optical axis, and TDA is a distance from a near-eye side of the first lens to a near-image side of the second lens on the first optical axis.

11. A virtual reality apparatus, characterized by Comprise: a first optical system comprising, in order from an eye side to an image side along a first optical axis, a reflective polarizing element, a quarter-wave plate, a first lens, and a second lens, wherein a combination of the reflective polarizing element, the quarter-wave plate, and the first lens has positive optical power, and the second lens has positive optical power or negative optical power; and a second optical system comprising, in order from an object side to an image side along a second optical axis, a first lens having negative optical power, a second lens having positive optical power, a third lens having positive optical power or negative optical power, a fourth lens having positive optical power or negative optical power, a fifth lens having positive optical power, and a sixth lens having negative optical power; wherein a real image formed by the second optical system is transmitted to a display screen in the form of an electrical signal, the first optical system is used to project a virtual image on the display screen and to transmit the real image to the display screen, and the virtual reality device satisfies: -1.65 ≤ (FG1A / fA) × (f1B / fB) ≤ -1.56, where FG1A is a combined focal length of the reflective polarizing element, the quarter-wave plate, and the first lens, fA is an effective focal length of the first optical system, f1B is an effective focal length of the first lens, and fB is an effective focal length of the second optical system; The virtual reality device satisfies: 2.93 mm ≤ (T12B+T56B) × tan(FOVB / 2) ≤ 3.45 mm, where T12B is an air separation of the first lens and the second lens on the second optical axis, T56B is an air separation of the fifth lens and the sixth lens on the second optical axis, and FOVB is a maximum field of view angle of the second optical system; The virtual reality device satisfies: 1.18 ≤ R10B / (R3B+R4B) < 1.6, where R10B is a curvature radius of an image side of the fifth lens, R3B is a curvature radius of an object side of the second lens, and R4B is a curvature radius of an image side of the second lens; The number of lenses having optical power in the first optical system is two; The number of lenses having optical power in the second optical system is six; The object side of the first lens is convex, and the image side is concave; The object side of the second lens is convex, and the image side is convex; The image side of the fifth lens is convex; The object side of the sixth lens is concave, and the image side is concave; The third lens and the fourth lens have opposite positive and negative attributes of optical power; The first optical system further comprises a partial reflection element attached to a near-image side of the first lens.

Images