Virtual reality devices

Abstract

This application discloses a virtual reality device, including a first optical system and a second optical system. The first optical system, along a first optical axis from the human eye side to the image side, sequentially includes a filter, a reflective polarizing element, a quarter-wave plate, a first lens, and a second lens, wherein the first lens has positive or negative optical power, and the second lens has 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, a second lens, a third lens, a fourth lens, and a fifth lens, each with optical power, wherein the first lens has negative optical power, the second lens has positive optical power, and the third lens has positive optical power. The 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 onto the display screen and the real image transmitted to the display screen. The virtual reality device satisfies: 0 < |f1B + f5B| / fA < 3 and 0 < (CT1A + CT2A) / (|R9B + R10B|) < 5.1.

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, virtual reality devices are widely used in various fields. Typically, a virtual reality device includes at least one of the following optical systems: eyepieces for providing immersion, perspective lenses for interacting with reality, positioning lenses for capturing motion, and facial recognition lenses for constructing facial expressions.

[0003] Currently, most manufacturers typically configure multiple different types of optical systems on various virtual reality devices to enhance immersion and improve user experience. However, how to optimize the architecture and performance of these multiple optical systems to improve the user experience of virtual reality devices has become one of the most pressing challenges for optical system designers. Summary of the Invention

[0004] 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 filter, a reflective polarizing element, a quarter-wave plate, a first lens, and a second lens, wherein the first lens has positive or negative optical power, and the second lens has 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, a second lens, a third lens, a fourth lens, and a fifth lens, each with optical power, wherein the first lens has negative optical power, the second lens has positive optical power, and the third lens has positive optical power. The 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 onto the display screen and the real image transmitted to the display screen. The virtual reality device can satisfy: 0 < |f1B+f5B| / fA < 3 and 0 < (CT1A+CT2A) / (|R9B+R10B|) < 5.1, where fA is the effective focal length of the first optical system, f1B is the effective focal length of the first lens, f5B is the effective focal length of the fifth lens, 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, R9B is the radius of curvature of the object side of the fifth lens, and R10B is the radius of curvature of the image side of the fifth lens.

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

[0006] In one embodiment, the virtual reality device may satisfy: 26 < R1A / (R1B+R2B) < 134, where R1A is the radius of curvature of the side of the first lens closest to the human eye, R1B is the radius of curvature of the object side of the first lens, and R2B is the radius of curvature of the image side of the first lens.

[0007] In one embodiment, the virtual reality device may satisfy: 3 < FG2A / (f2B+f3B) < 4, where FG2A is the combined focal length of the quarter-wave plate and the first lens, f2B is the effective focal length of the second lens, and f3B is the effective focal length of the third lens.

[0008] In one embodiment, the virtual reality device may satisfy: 3 < R2A / (R3B+R4B) < 12, where R2A is the radius of curvature of the near-image side of the first 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.

[0009] In one embodiment, the virtual reality device may satisfy: 1.2 < CT2A / (T45B+CT5B) < 3.7, where CT2A is the center thickness of the second lens on the first optical axis, T45B is the air gap between the fourth and fifth lenses on the second optical axis, and CT5B is the center thickness of the fifth lens on the second optical axis.

[0010] In one embodiment, the virtual reality device can satisfy: 7 < |R3A| / (CT1A+CTQA) < 30.5, where R3A is the radius of curvature of the side of the second lens closest to the human eye, CT1A is the center thickness of the first lens on the first optical axis, and CTQA is the center thickness of the quarter-wave plate on the first optical axis.

[0011] In one embodiment, the virtual reality device may satisfy: 9.3 < TDA / (CTFA+CTRA+CTQA) < 15, where 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, CTFA is the center thickness of the filter on the first optical axis, CTRA is the center thickness of the reflective polarizing element on the first optical axis, and CTQA is the center thickness of the quarter-wave plate on the first optical axis.

[0012] In one embodiment, the virtual reality device may satisfy: 1.7 < (R6B - R5B) / (R7B + R8B) < 2.7, where R5B is the radius of curvature of the object side of the third lens, R6B is the radius of curvature of the image side of the third lens, R7B is the radius of curvature of the object side of the fourth lens, and R8B is the radius of curvature of the image side of the fourth lens.

[0013] In one embodiment, the virtual reality device may satisfy: 6.8 < (fA / EPDA) × (fB / EPDB) < 8.8, where fA is the effective focal length of the first optical system, EPDA is the entrance pupil diameter of the first optical system, fB is the effective focal length of the second optical system, and EPDB is the entrance pupil diameter of the second optical system.

[0014] In one embodiment, the virtual reality device may satisfy: 3.5 < (fA × tan(FOVA / 2)) / (fB × tan(FOVB / 2)) < 11, where fA is the effective focal length of the first optical system, FOVA is the maximum field of view of the first optical system, fB is the effective focal length of the second optical system, and FOVB is the maximum field of view of the second optical system.

[0015] In one embodiment, the virtual reality device can satisfy: 2.1mm < TDA / (tan(FOVB / 2)) < 8.6mm, where 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, and FOVB is the maximum field of view of the second optical system.

[0016] In one embodiment, the object-side surface of the second lens is concave and the image-side surface is convex; and the object-side surface of the third lens is convex and the image-side surface is convex.

[0017] In one embodiment, a reflective polarizing element is attached to the near-image side of the filter; and a quarter-wave plate is attached to the near-eye side of the first lens.

[0018] In one embodiment, the virtual reality device further includes a portion of the reflective element 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.

[0019] In an exemplary embodiment of this application, by reasonably setting the architecture of the first optical system and the second optical system, and setting the optical power and optical technical parameters 0 < |f1B+f5B| / fA < 3 and 0 < (CT1A+CT2A) / (|R9B+R10B|) < 5.1 for each lens, the first optical system can have a shorter length and the second optical system can have a larger field of view. This is beneficial for aberration compensation generated by the first lens and the fifth lens in the second optical system, thereby improving the performance of the second optical system and the user experience of the virtual reality device. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1This is a schematic diagram of the structure of a virtual reality device according to an exemplary embodiment of this application;

[0022] Figure 2A and Figure 2B These are schematic diagrams of the first and second perspectives of a virtual reality device according to exemplary embodiments of this application;

[0023] Figure 3 This is a schematic diagram of the structure of the first optical system in Embodiment 1;

[0024] Figures 4A to 4C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the first optical system of Embodiment 1 are shown respectively.

[0025] Figure 5 This is a schematic diagram of the structure of the first optical system in Embodiment 2;

[0026] Figures 6A to 6C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the first optical system of Embodiment 2 are shown respectively.

[0027] Figure 7 This is a schematic diagram of the structure of the first optical system in Embodiment 3;

[0028] 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.

[0029] Figure 9 This is a schematic diagram of the structure of the second optical system in Example 4;

[0030] 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.

[0031] Figure 11 This is a schematic diagram of the structure of the second optical system in Embodiment 5;

[0032] 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.

[0033] Figure 13 This is a schematic diagram of the structure of the second optical system in Example 6;

[0034] 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.

[0035] Figure 15 This is a schematic diagram of the structure of the second optical system in Example 7;

[0036] Figures 16A to 16C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the second optical system in Embodiment 7 are shown respectively.

[0037] Figure 17 This is a schematic diagram of the structure of the second optical system in Example 8;

[0038] Figures 18A to 18C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the second optical system of Embodiment 8 are shown respectively.

[0039] Figure 19 This is a schematic diagram of the structure of the second optical system in Embodiment 9; and

[0040] Figures 20A to 20C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the second optical system of Embodiment 9 are shown respectively. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 9. 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 9. The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] The features, principles and other aspects of this application are described in detail below.

[0049] 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 recognizing facial expressions. 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.

[0050] The second optical system 120 can capture real-world images 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 the virtual and real worlds. The virtual reality device 100 provided in this application can combine the immersive experience of the first optical system 110 with the perspective function of the second optical system 120 to realize the interaction between the real world and the virtual world of the virtual device, so that the virtual device is no longer limited by space.

[0051] In an exemplary embodiment, the first optical system includes, sequentially along the first optical axis from the eye side to the image side, a filter, a reflective polarizing element, a quarter-wave plate, a first lens, and a second lens. The reflective polarizing element can be attached to the image side of the filter. The quarter-wave plate can be attached to the eye side of the first lens. Exemplarily, the filter can be planar to facilitate attaching the reflective polarizing element to the filter. 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 helps to shorten the length of the first optical system.

[0052] 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.

[0053] In an exemplary embodiment, the second optical system includes five lenses with optical power: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. These five lenses are arranged sequentially from the object side to the image side along a second optical axis. Any two adjacent lenses from the first to the fifth lens may have a gap between them.

[0054] In an exemplary embodiment, the first lens may have positive or negative optical power; the second lens may have positive or negative optical power; the first lens may have negative optical power; the second lens may have positive optical power; the third lens may have positive optical power; the fourth lens may have positive or negative optical power; and the fifth lens may have positive or negative optical power. Exemplarily, the combination of the quarter-wave plate and the first lens may have positive optical power.

[0055] In an exemplary embodiment, the virtual reality device according to this application can satisfy: 0 < |f1B+f5B| / fA < 3 and 0 < (CT1A+CT2A) / (|R9B+R10B|) < 5.1, where fA is the effective focal length of the first optical system, f1B is the effective focal length of the first lens, f5B is the effective focal length of the fifth lens, 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, R9B is the radius of curvature of the object side of the fifth lens, and R10B is the radius of curvature of the image side of the fifth lens.

[0056] In this application, by reasonably setting the architecture of the first optical system and the second optical system, and setting the optical power and optical technical parameters of each lens and lens as 0 < |f1B+f5B| / fA < 3 and 0 < (CT1A+CT2A) / (|R9B+R10B|) < 5.1, the first optical system can have a shorter length and the second optical system can have a larger field of view. This is beneficial for aberration compensation generated by the first lens and the fifth lens in the second optical system, thereby improving the performance of the second optical system and the user experience of the virtual reality device.

[0057] In an exemplary embodiment, the virtual reality device according to this application satisfies: 26 < R1A / (R1B+R2B) < 134, where R1A is the radius of curvature of the eye-side of the first lens, R1B is the radius of curvature of the object-side of the first lens, and R2B is the radius of curvature of the image-side of the first lens. Satisfying 26 < R1A / (R1B+R2B) < 134 allows for control of the radius of curvature of the first lens, minimizing the curvature of its eye-side, thus facilitating the attachment of the quarter-wave plate. Simultaneously, by controlling the radii of curvature of the object-side and image-side of the first lens, the light rays in the edge field of view of the second optical system can be controlled, thereby reducing vignetting in the edge field of view and increasing the light intensity of the edge field of view.

[0058] In an exemplary embodiment, the virtual reality device according to this application satisfies: 3 < FG2A / (f2B+f3B) < 4, where FG2A is the combined focal length of the quarter-wave plate and 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 < FG2A / (f2B+f3B) < 4 allows for the compression of light rays in the first optical system by controlling the ratio of the combined focal length of the quarter-wave plate and the first lens to the effective focal length of the second and third lenses, thereby reducing the image plane size. Simultaneously, the combination of the second and third lenses can compress the light rays passing through the first lens, facilitating a reduction in chip size.

[0059] In an exemplary embodiment, the virtual reality device according to this application satisfies: 3 < R2A / (R3B+R4B) < 12, where R2A is the radius of curvature of the near-image side of the first 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 3 < R2A / (R3B+R4B) < 12 allows for reasonable control of the shapes of the first and second lenses by controlling the radius of curvature of the first lens and the object and image sides of the second lens, ensuring the uniformity of the first and second lenses, and reducing the risk of the surface shapes of the first and second lenses affecting the performance of the first and second optical systems, respectively.

[0060] In an exemplary embodiment, the virtual reality device according to this application satisfies: 1.2 < CT2A / (T45B+CT5B) < 3.7, where CT2A is the center thickness of the second lens on the first optical axis, T45B is the air gap between the fourth and fifth lenses on the second optical axis, and CT5B is the center thickness of the fifth lens on the second optical axis. Satisfying 1.2 < CT2A / (T45B+CT5B) < 3.7 allows for improved shaping of the second, fourth, and fifth lenses by controlling the ratio of the center thickness of the second lens, the air gap between the fourth and fifth lenses, and the center thickness of the fifth lens. Simultaneously, it enables a compact structure for both the first and second optical systems, reducing the length of the optical system while ensuring the lenses can be formed, thus meeting the requirements for a thinner and lighter virtual reality device.

[0061] In an exemplary embodiment, the virtual reality device according to this application satisfies: 7 < |R3A| / (CT1A+CTQA) < 30.5, where R3A is the radius of curvature of the second lens on the side closest to the human eye, CT1A is the center thickness of the first lens on the first optical axis, and CTQA is the center thickness of the quarter-wave plate on the first optical axis. Satisfying 7 < |R3A| / (CT1A+CTQA) < 30.5 allows control of the light path in the first optical system by controlling the ratio of the radius of curvature of the second lens, the center thickness of the first lens, and the center thickness of the quarter-wave plate. This reduces the height of the off-axis field of view rays, decreases reflection between the second lens and the image surface, and thus helps reduce the intensity of ghosting.

[0062] In an exemplary embodiment, the virtual reality device according to this application satisfies: 9.3 < TDA / (CTFA+CTRA+CTQA) < 15, where 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, CTFA is the center thickness of the filter on the first optical axis, CTRA is the center thickness of the reflective polarizing element on the first optical axis, and CTQA is the center thickness of the quarter-wave plate on the first optical axis. Satisfying 9.3 < TDA / (CTFA+CTRA+CTQA) < 15 allows for the control of the ratio of 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, the center thickness of the filter, the center thickness of the reflective polarizing element, and the center thickness of the quarter-wave plate, thereby ensuring the reflection length of the first optical system and facilitating the reduction of the overall height of the virtual reality device.

[0063] In an exemplary embodiment, the virtual reality device according to this application satisfies: 1.7 < (R6B - R5B) / (R7B + R8B) < 2.7, where R5B is the radius of curvature of the object-side surface of the third lens, R6B is the radius of curvature of the image-side surface of the third lens, R7B is the radius of curvature of the object-side surface of the fourth lens, and R8B is the radius of curvature of the image-side surface of the fourth lens. Satisfying 1.7 < (R6B - R5B) / (R7B + R8B) < 2.7 allows for the constraint of the surface shape of the object-side and image-side surfaces of the third and fourth lenses by controlling their radii of curvature, thereby ensuring the uniformity and manufacturability of the third and fourth lenses.

[0064] In an exemplary embodiment, the virtual reality device according to this application satisfies: 6.8 < (fA / EPDA) × (fB / EPDB) < 8.8, where fA is the effective focal length of the first optical system, EPDA is the entrance pupil diameter of the first optical system, fB is the effective focal length of the second optical system, and EPDB is the entrance pupil diameter of the second optical system. Satisfying 6.8 < (fA / EPDA) × (fB / EPDB) < 8.8 allows for control of the effective focal length and entrance pupil diameter of the first optical system, reducing the decrease in image distortion performance due to pupil movement when the human eye rotates. Simultaneously, by controlling the effective focal length and entrance pupil diameter of the second optical system, the luminous flux of the second optical system can be controlled, potentially increasing the luminous flux and thus improving image brightness.

[0065] In an exemplary embodiment, the virtual reality device according to this application satisfies: 3.5 < (fA × tan(FOVA / 2)) / (fB × tan(FOVB / 2)) < 11, where fA is the effective focal length of the first optical system, FOVA is the maximum field of view of the first optical system, fB is the effective focal length of the second optical system, and FOVB is the maximum field of view of the second optical system. Satisfying 3.5 < (fA × tan(FOVA / 2)) / (fB × tan(FOVB / 2)) < 11 allows control of the image plane size of the first optical system and the chip size of the second optical system by controlling the effective focal length and maximum field of view of the first and second optical systems. In the virtual reality device, image information on the chip of the second optical system can be transmitted to the image plane of the first optical system and then enter the human eye. Controlling the above ratio facilitates image conversion between the two optical systems.

[0066] In an exemplary embodiment, the virtual reality device according to this application satisfies the following condition: 2.1mm < TDA / (tan(FOVB / 2)) < 8.6mm, where 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, and FOVB is the maximum field of view of the second optical system. Satisfying 2.1mm < TDA / (tan(FOVB / 2)) < 8.6mm can be achieved by controlling the ratio of 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 to the maximum field of view of the second optical system, making TDA smaller and FOVB larger. This benefits both the thinness of the first optical system and the large field of view of the second optical system.

[0067] In an exemplary embodiment, in the second optical system, the object-side surface of the second lens may be concave, and the image-side surface may be convex; and the object-side surface of the third lens may be convex, and the image-side surface may be convex. This application, by reasonably setting the optical power of the second and third lenses and the shapes of their object-side and image-side surfaces, facilitates the convergence of light rays by the second and third lenses, while also increasing the field of view of the second optical system and reducing the boundary effects of the virtual reality device.

[0068] In an exemplary embodiment, in the first optical system, a partial reflective element 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 partial reflective element BS is, for example, but not limited to, a semi-transparent and semi-reflective film layer, which can be configured to allow a portion of the light to pass through while another portion of the light is reflected.

[0069] 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 five lenses described 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.

[0070] In embodiments of this application, at least one of the mirror surfaces of each lens and / or lens is an aspherical mirror surface. Specifically, 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 fifth 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 mirror surfaces of the first and second lenses, from the side closest to the human eye to the side closest to the image, is an aspherical mirror, and at least one of the object-side and image-side surfaces of each of the first, second, third, fourth, and fifth lenses is an aspherical mirror. Optionally, both the object-side and image-side surfaces of the first, second, third, fourth, and fifth lenses are aspherical mirrors.

[0071] 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 five lenses as examples, the first optical system is not limited to comprising two lenses and the second optical system is not limited to comprising five lenses. If necessary, the first optical system and / or the second optical system may also include other numbers of lenses.

[0072] 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.

[0073] Example 1

[0074] 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 9 below. Figure 3 This is a schematic diagram of the structure of the first optical system in Embodiment 1.

[0075] like Figure 3 As shown, the first optical system includes, in sequence from the human eye side to the image side: aperture STO, filter IR, reflective polarizing element RP, quarter-wave plate QWP, first lens L1, second lens L2, partial reflective element BS, and image plane IMG.

[0076] The side of filter IR closest to the human eye is flat, and the side closest to the image is also flat. The first lens L1 has a convex side closest to the human eye, and the side closest to the image is also convex. The second lens L2 has a concave side closest to the human eye, and the side closest to the image is convex. A reflective polarizing element RP is attached to the side of filter IR closest to the image. A quarter-wave plate QWP is attached to the side of the first lens L1 closest to the human eye. A partial reflective element BS is attached to the side of the second lens L2 closest to the image.

[0077] 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 second lens L2, where it undergoes a second reflection. The light after the second reflection sequentially passes through the second lens L2, the first lens L1, the quarter-wave plate QWP, the reflective polarizer RP, and the filter IR, 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 a VR headset, the light after two reflections is ultimately projected into the eyes of the user.

[0078] 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 each component in the order of number 20 to number 1 and is finally projected onto the target object in space, such as the human eye.

[0079]

[0080]

[0081] Table 1

[0082] In this example, the combined focal length FG2A of the quarter-wave plate and the first lens is 23.43 mm, the effective focal length fA of the first optical system is 23.60 mm, the entrance pupil diameter EPDA of the first optical system is 4.00 mm, the maximum field of view FOVA of the first optical system is 106.00°, the distance TDA between the near-eye side of the first lens and the near-image side of the second lens on the first optical axis is 14.99 mm, the center thickness CTFA of the filter on the first optical axis is 0.64 mm, the center thickness CTRA of the reflective polarizing element on the first optical axis is 0.16 mm, and the center thickness CTQA of the quarter-wave plate on the first optical axis is 0.40 mm.

[0083] In Example 1, the near-image side of the first lens L1 is aspherical, and the surface shape x of the aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0084]

[0085] 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 .

[0086]

[0087]

[0088] Table 2

[0089] 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.

[0090] Example 2

[0091] The following is for reference Figures 5 to 6C The first optical system in a 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 9 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.

[0092] like Figure 5 As shown, the first optical system includes, in sequence from the human eye side to the image side: aperture STO, filter IR, reflective polarizing element RP, quarter-wave plate QWP, first lens L1, partial reflective element BS, second lens L2, and image plane IMG.

[0093] The side of filter IR closest to the human eye is flat, and the side closest to the image is also flat. The side of the first lens L1 closest to the human eye is convex, and the side closest to the image is also convex. The side of the second lens L2 closest to the human eye is concave, and the side closest to the image is convex. A reflective polarizing element RP is attached to the side of filter IR closest to the image. A quarter-wave plate QWP is attached to the side of the first lens L1 closest to the human eye. A partial reflective element BS is attached to the side of the first lens L1 closest to the image.

[0094] 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 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 filter IR, 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.

[0095] In this example, the combined focal length FG2A of the quarter-wave plate and the first lens is 25.36 mm, the effective focal length fA of the first optical system is 25.20 mm, the entrance pupil diameter EPDA of the first optical system is 4.50 mm, the maximum field of view FOVA of the first optical system is 106.00°, the distance TDA between the near-eye side of the first lens and the near-image side of the second lens on the first optical axis is 10.93 mm, the center thickness CTFA of the filter on the first optical axis is 0.72 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 0.27 mm.

[0096] 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 the components in the order of number 16 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 the aspherical mirrors in Embodiment 2.

[0097]

[0098] Table 3

[0099] surface The side of the second lens L2 closest to the human eye The near-image side view of the second lens L2 A4 -2.9842E-06 -8.4684E-06 A6 -2.7804E-09 3.5811E-08 A8 -3.8702E-12 -2.2283E-11 A10 -2.8278E-15 -3.4163E-14 A12 3.9693E-18 2.4206E-17 A14 0.0000E+00 0.0000E+00 A16 0.0000E+00 0.0000E+00 A18 0.0000E+00 0.0000E+00 A20 0.0000E+00 0.0000E+00

[0100] Table 4

[0101] Figure 6A The 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.

[0102] Example 3

[0103] 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 9 below. Figure 7 This is a schematic diagram of the structure of the first optical system in Embodiment 3.

[0104] like Figure 7 As shown, the first optical system includes, in sequence from the human eye side to the image side: aperture STO, filter IR, reflective polarizing element RP, quarter-wave plate QWP, first lens L1, partial reflective element BS, second lens L2, and image plane IMG.

[0105] The side of filter IR closest to the human eye is flat, and the side closest to the image is also flat. The first lens L1 has a convex surface both near the human eye and near the image. The second lens L2 has a concave surface near the human eye and a flat surface near the image. A reflective polarizing element RP is attached to the near-image side of filter IR. A quarter-wave plate QWP is attached to the near-eye side of the first lens L1. A partial reflective element BS is attached to the near-eye side of the second lens L2.

[0106] 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 eye-friendly side of the second lens L2, 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 filter IR, 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 a VR headset, the light after two reflections is ultimately projected into the user's eyes.

[0107] In this example, the combined focal length FG2A of the quarter-wave plate and the first lens is 25.74 mm, the effective focal length fA of the first optical system is 26.41 mm, the entrance pupil diameter EPDA of the first optical system is 4.50 mm, the maximum field of view FOVA of the first optical system is 106.00°, the distance TDA between the near-eye side of the first lens and the near-image side of the second lens on the first optical axis is 16.15 mm, the center thickness CTFA of the filter on the first optical axis is 0.72 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.

[0108] 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 18 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.

[0109]

[0110]

[0111] Table 5

[0112] surface The near-view image of the first lens L1 (lateral view) A4 1.6112E-06 A6 -3.2482E-11 A8 4.1111E-13 A10 -4.2810E-16 A12 1.6348E-19 A14 0.0000E+00 A16 0.0000E+00 A18 0.0000E+00 A20 0.0000E+00

[0113] Table 6

[0114] 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.

[0115] Example 4

[0116] 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.

[0117] like Figure 9 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 filter E6, and an imaging surface S13.

[0118] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged on the imaging surface S13.

[0119] 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).

[0120]

[0121] Table 7

[0122] In this example, the effective focal length fB of the second optical system is 1.74 mm, the entrance pupil diameter EPDB of the second optical system is 1.40 mm, and the maximum field of view FOVB of the second optical system is 153.45°.

[0123] In embodiment 4, the object-side surface and image-side surface of any one of the first lens E1 to the fifth lens E5 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:

[0124]

[0125] 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. Tables 8-1 and 8-2 below give the higher-order coefficients A4, A6, A8, A10 that can be used for each aspherical mirror S1-S10 in Example 4. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0126]

[0127]

[0128] Table 8-1

[0129] Face number A18 A20 A22 A24 A26 A28 A30 S1 4.0751E-02 -1.2777E-02 2.8391E-03 -4.3691E-04 4.4285E-05 -2.6591E-06 7.1645E-08 S2 -1.1936E+04 2.1364E+04 -2.6469E+04 2.2342E+04 -1.2265E+04 3.9473E+03 -5.6478E+02 S3 -9.7030E+02 3.7265E+02 -3.8072E+01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 3.1708E-01 -6.8766E-02 5.9834E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 -9.6825E-03 2.1257E-03 -2.9245E-04 1.8263E-05 0.0000E+00 0.0000E+00 0.0000E+00 S6 -3.1720E-01 1.1241E-01 -2.4827E-02 3.1199E-03 -1.7054E-04 0.0000E+00 0.0000E+00 S7 -6.4738E-01 2.2417E-01 -4.8401E-02 5.9287E-03 -3.1435E-04 0.0000E+00 0.0000E+00 S8 -3.2740E+01 2.1050E+01 -9.8246E+00 3.2240E+00 -7.0339E-01 9.1436E-02 -5.3523E-03 S9 -4.8436E+01 3.3202E+01 -1.6276E+01 5.5440E+00 -1.2445E+00 1.6538E-01 -9.8477E-03 S10 8.1084E+00 -3.9492E+00 1.3501E+00 -3.1722E-01 4.8777E-02 -4.4173E-03 1.7852E-04

[0130] Table 8-2

[0131] 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.

[0132] Example 5

[0133] 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.

[0134] 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 filter E6, and an imaging surface S13.

[0135] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged on the imaging surface S13.

[0136] In this example, the effective focal length fB of the second optical system is 1.70 mm, the entrance pupil diameter EPDB of the second optical system is 1.15 mm, and the maximum field of view FOVB of the second optical system is 124.21°.

[0137] Table 9 shows the basic parameters of the second optical system of Example 5, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm). Tables 10-1 and 10-2 give the higher-order coefficients that can be used for each aspherical mirror S1-S10 in Example 5.

[0138]

[0139] Table 9

[0140] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.7787E-01 -1.7428E-02 -1.6082E-01 2.9414E-01 -2.9601E-01 1.9680E-01 -9.1131E-02 S2 4.5053E-01 -6.2100E+00 1.1038E+02 -1.1322E+03 7.4782E+03 -3.3705E+04 1.0717E+05 S3 1.1877E-01 -2.3050E+00 2.2732E+01 -1.3285E+02 4.8033E+02 -1.0859E+03 1.4940E+03 S4 -1.5916E-02 4.8503E-01 -2.7700E+00 7.6040E+00 -1.2288E+01 1.2244E+01 -7.3980E+00 S5 5.6226E-02 -2.7849E-02 -1.3134E-01 -1.2477E+00 9.3626E+00 -2.9119E+01 5.4881E+01 S6 4.3883E-01 -9.1517E+00 6.0299E+01 -2.3000E+02 5.7513E+02 -9.9853E+02 1.2431E+03 S7 6.3335E-01 -8.2390E+00 6.0418E+01 -2.5244E+02 6.8055E+02 -1.2640E+03 1.6765E+03 S8 -1.9036E-01 3.2772E+00 -1.5983E+01 5.4347E+01 -1.3795E+02 2.5977E+02 -3.5922E+02 S9 -2.9958E-01 1.9635E+00 -8.3719E+00 2.2140E+01 -3.9767E+01 5.0433E+01 -4.5974E+01 S10 1.5606E-01 -1.0710E+00 4.6177E+00 -1.2314E+01 2.1240E+01 -2.5024E+01 2.0888E+01

[0141] Table 10-1

[0142]

[0143]

[0144] Table 10-2

[0145] 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 12CThe 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.

[0146] Example 6

[0147] 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.

[0148] 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 filter E6, and an imaging surface S13.

[0149] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged on the imaging surface S13.

[0150] In this example, the effective focal length fB of the second optical system is 1.73 mm, the entrance pupil diameter EPDB of the second optical system is 1.39 mm, and the maximum field of view FOVB of the second optical system is 157.49°.

[0151] 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). Tables 12-1 and 12-2 give the higher-order coefficients that can be used for each aspherical mirror S1-S10 in Example 6.

[0152]

[0153]

[0154] Table 11

[0155] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.2321E-01 -1.7400E-01 1.6549E-01 -1.7499E-01 1.8568E-01 -1.7181E-01 1.2557E-01 S2 2.9880E-01 8.9848E-01 -2.0580E+01 2.4351E+02 -1.8193E+03 9.1665E+03 -3.2264E+04 S3 1.3950E-02 -2.6611E-01 1.3912E+00 -4.0157E+00 5.9918E+00 -3.2773E+00 -1.5286E+00 S4 3.3995E-02 -9.1199E-02 1.7773E-01 -2.6831E-01 2.7482E-01 -1.7571E-01 6.2389E-02 S5 3.1289E-02 -6.7758E-02 8.3689E-02 -7.1096E-02 3.8224E-02 -1.2616E-02 2.3598E-03 S6 -2.0062E-01 1.8324E-01 1.2026E-01 -4.0222E-01 3.9443E-01 -2.1641E-01 7.4041E-02 S7 2.3565E-01 -3.4258E-02 -3.7162E-02 5.8437E-02 -7.8251E-02 6.3851E-02 -2.7956E-02 S8 1.4235E-01 1.0248E-01 -1.4720E-01 -1.9132E-01 6.4904E-01 -7.4387E-01 4.6633E-01 S9 -1.6343E-01 1.1878E-01 -8.0955E-03 -3.0342E-01 5.8088E-01 -5.4386E-01 2.7324E-01 S10 1.6150E-01 -5.5349E-01 8.8429E-01 -9.5696E-02 -2.5683E+00 5.6429E+00 -6.6004E+00

[0156] Table 12-1

[0157] Face number A18 A20 A22 A24 A26 A28 A30 S1 -6.8851E-02 2.7560E-02 -7.8762E-03 1.5586E-03 -2.0249E-04 1.5516E-05 -5.3111E-07 S2 8.0842E+04 -1.4502E+05 1.8488E+05 -1.6352E+05 9.5387E+04 -3.2998E+04 5.1270E+03 S3 1.8628E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -9.3453E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 -1.9015E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -1.5949E-02 2.0202E-03 -1.1672E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 6.1285E-03 -5.0128E-04 -9.2754E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -1.6979E-01 3.3771E-02 -2.8430E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 -5.8312E-02 -6.8814E-03 5.7196E-03 -7.8275E-04 0.0000E+00 0.0000E+00 0.0000E+00 S10 4.9795E+00 -2.5603E+00 9.0879E-01 -2.1959E-01 3.4522E-02 -3.1860E-03 1.3101E-04

[0158] Table 12-2

[0159] 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.

[0160] Example 7

[0161] The following is for reference Figures 15 to 16C The 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.

[0162] 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 filter E6, and an imaging surface S13.

[0163] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. 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 filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged on the imaging surface S13.

[0164] In this example, the effective focal length fB of the second optical system is 1.69 mm, the entrance pupil diameter EPDB of the second optical system is 1.16 mm, and the maximum field of view FOVB of the second optical system is 128.87°.

[0165] Table 13 shows the basic parameters of the second optical system of Example 7, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm). Tables 14-1 and 14-2 give the higher-order coefficients that can be used for each aspherical mirror S1-S10 in Example 7.

[0166]

[0167] Table 13

[0168]

[0169]

[0170] Table 14-1

[0171] Face number A18 A20 A22 A24 A26 A28 A30 S1 -8.1375E-01 2.2378E-01 -4.4399E-02 6.1850E-03 -5.7364E-04 3.1793E-05 -7.9631E-07 S2 5.3652E+06 -9.7182E+06 1.2647E+07 -1.1519E+07 6.9676E+06 -2.5135E+06 4.0908E+05 S3 -1.6542E+03 6.6747E+02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 3.3305E-01 -3.9513E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 -1.8858E+02 1.1778E+02 -5.2622E+01 1.6394E+01 -3.3813E+00 4.1474E-01 -2.2895E-02 S6 1.6498E+02 -9.9253E+01 4.2482E+01 -1.2635E+01 2.4831E+00 -2.9004E-01 1.5254E-02 S7 6.7377E+01 -4.4458E+01 2.0187E+01 -6.2306E+00 1.2505E+00 -1.4733E-01 7.7368E-03 S8 1.2482E+01 -6.0083E+00 2.0438E+00 -4.8076E-01 7.4439E-02 -6.8277E-03 2.8112E-04 S9 3.4591E-01 -1.3969E-01 3.9095E-02 -7.4457E-03 9.2090E-04 -6.6686E-05 2.1450E-06 S10 9.7917E-01 -2.9989E-01 6.5084E-02 -9.7172E-03 9.4237E-04 -5.2882E-05 1.2812E-06

[0172] Table 14-2

[0173] Figure 16A The 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.

[0174] Example 8

[0175] The following is for reference Figures 17 to 18C The second optical system in a virtual reality device according to Embodiment 8 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 17 A schematic diagram of the structure of a second optical system according to Embodiment 8 of this application is shown.

[0176] like Figure 17 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 filter E6, and an imaging surface S13.

[0177] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged on the imaging surface S13.

[0178] In this example, the effective focal length fB of the second optical system is 1.69 mm, the entrance pupil diameter EPDB of the second optical system is 1.14 mm, and the maximum field of view FOVB of the second optical system is 138.52°.

[0179] Table 15 shows the basic parameters of the second optical system of Example 8, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm). Tables 16-1 and 16-2 give the higher-order coefficients that can be used for each aspherical mirror S1-S10 in Example 8.

[0180]

[0181] Table 15

[0182] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.7074E-01 -1.7256E-01 -3.0000E-02 4.1882E-01 -8.4595E-01 1.0250E+00 -8.4671E-01 S2 4.8783E-01 -3.7795E+00 7.4797E+01 -9.5360E+02 8.1166E+03 -4.7856E+04 2.0011E+05 S3 4.7079E-02 -1.0302E+00 1.5961E+01 -1.4940E+02 8.5000E+02 -2.9607E+03 6.1623E+03 S4 5.8580E-02 -2.1672E-01 4.4972E-01 -7.4777E-01 1.0099E+00 -1.0107E+00 6.6077E-01 S5 8.1071E-02 -3.4031E-01 9.5486E-01 -2.0225E+00 2.9551E+00 -2.5341E+00 3.3421E-01 S6 -1.0714E-01 -1.6982E+00 1.3611E+01 -5.4155E+01 1.3496E+02 -2.2760E+02 2.7112E+02 S7 2.6525E-01 -1.6410E+00 1.2804E+01 -5.3195E+01 1.3639E+02 -2.3447E+02 2.8324E+02 S8 2.3881E-01 -1.4721E+00 1.0474E+01 -4.2046E+01 1.0845E+02 -1.9308E+02 2.4609E+02 S9 -4.2552E-02 -8.8113E-01 5.5257E+00 -1.9149E+01 4.2447E+01 -6.4333E+01 6.9052E+01 S10 2.7000E-01 -1.1579E+00 3.6629E+00 -8.5906E+00 1.4404E+01 -1.7403E+01 1.5342E+01

[0183] Table 16-1

[0184] Face number A18 A20 A22 A24 A26 A28 A30 S1 4.9512E-01 -2.0717E-01 6.1654E-02 -1.2745E-02 1.7395E-03 -1.4093E-04 5.1322E-06 S2 -6.0099E+05 1.2994E+06 -2.0036E+06 2.1484E+06 -1.5216E+06 6.3975E+05 -1.2089E+05 S3 -7.0309E+03 3.3811E+03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -2.4345E-01 3.7900E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 2.1613E+00 -3.0578E+00 2.2409E+00 -1.0129E+00 2.8377E-01 -4.5351E-02 3.1681E-03 S6 -2.3347E+02 1.4648E+02 -6.6481E+01 2.1291E+01 -4.5664E+00 5.8869E-01 -3.4482E-02 S7 -2.4658E+02 1.5610E+02 -7.1426E+01 2.3062E+01 -4.9924E+00 6.5102E-01 -3.8694E-02 S8 -2.2835E+02 1.5465E+02 -7.5651E+01 2.6024E+01 -5.9703E+00 8.1986E-01 -5.0960E-02 S9 -5.3379E+01 2.9813E+01 -1.1912E+01 3.3168E+00 -6.1066E-01 6.6744E-02 -3.2764E-03 S10 -9.9302E+00 4.7079E+00 -1.6137E+00 3.8881E-01 -6.2399E-02 5.9843E-03 -2.5927E-04

[0185] Table 16-2

[0186] Figure 18A The on-axis chromatic aberration curve of the second optical system of Embodiment 8 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system. Figure 18B The astigmatism curves of the second optical system of Embodiment 8 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 18C The distortion curves of the second optical system in Embodiment 8 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 18A to 18C It can be seen that the second optical system given in Example 8 can achieve good imaging quality.

[0187] Example 9

[0188] The following is for reference Figures 19 to 20CThe second optical system in a virtual reality device according to Embodiment 9 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 19 A schematic diagram of the structure of a second optical system according to Embodiment 9 of this application is shown.

[0189] like Figure 19 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 filter E6, and an imaging surface S13.

[0190] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. 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 filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged on the imaging surface S13.

[0191] In this example, the effective focal length fB of the second optical system is 1.66 mm, the entrance pupil diameter EPDB of the second optical system is 1.12 mm, and the maximum field of view FOVB of the second optical system is 125.84°.

[0192] Table 17 shows the basic parameters of the second optical system of Embodiment 9, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm). Tables 18-1 and 18-2 give the higher-order coefficients that can be used for each aspherical mirror S1-S10 in Embodiment 9.

[0193]

[0194] Table 17

[0195] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.7355E-01 -3.0246E-01 4.1559E-01 -4.7359E-01 3.8882E-01 -2.1817E-01 7.9140E-02 S2 -1.6540E+00 5.7676E+01 -9.2013E+02 9.1241E+03 -6.0262E+04 2.7641E+05 -9.0288E+05 S3 4.8310E-02 -5.4677E-01 4.2558E+00 -2.1257E+01 6.9268E+01 -1.4478E+02 1.8599E+02 S4 -6.1927E-02 7.6799E-01 -3.7088E+00 9.5562E+00 -1.4845E+01 1.4328E+01 -8.4076E+00 S5 -6.7445E-02 9.7609E-01 -5.2384E+00 1.6732E+01 -3.6367E+01 5.6698E+01 -6.4759E+01 S6 2.4038E-01 -4.2295E+00 2.3310E+01 -8.0374E+01 1.9018E+02 -3.1967E+02 3.9015E+02 S7 3.6515E-01 -2.2595E+00 1.2238E+01 -4.2685E+01 1.0203E+02 -1.7347E+02 2.1512E+02 S8 -1.2338E-01 2.3320E+00 -1.0985E+01 3.3226E+01 -6.9534E+01 1.0416E+02 -1.1384E+02 S9 -2.4481E-01 1.2031E+00 -4.6673E+00 1.1315E+01 -1.8261E+01 2.0550E+01 -1.6565E+01 S10 -6.6123E-02 4.0155E-01 -1.7103E+00 4.5150E+00 -7.8715E+00 9.4925E+00 -8.1327E+00

[0196] Table 18-1

[0197] Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.5525E-02 -1.9658E-04 1.0382E-03 -3.0023E-04 4.3857E-05 -3.4095E-06 1.1232E-07 S2 2.1269E+06 -3.6186E+06 4.3987E+06 -3.7192E+06 2.0738E+06 -6.8404E+05 1.0081E+05 S3 -1.3305E+02 4.0382E+01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 2.7465E+00 -3.8303E-01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 5.4400E+01 -3.3329E+01 1.4586E+01 -4.3916E+00 8.5091E-01 -9.3206E-02 4.1833E-03 S6 -3.5013E+02 2.3150E+02 -1.1157E+02 3.8134E+01 -8.7557E+00 1.2102E+00 -7.6018E-02 S7 -1.9761E+02 1.3492E+02 -6.7733E+01 2.4286E+01 -5.8777E+00 8.5842E-01 -5.7008E-02 S8 9.1546E+01 -5.4082E+01 2.3175E+01 -7.0048E+00 1.4154E+00 -1.7154E-01 9.4268E-03 S9 9.6914E+00 -4.1227E+00 1.2623E+00 -2.7101E-01 3.8722E-02 -3.3073E-03 1.2777E-04 S10 5.0195E+00 -2.2378E+00 7.1381E-01 -1.5879E-01 2.3386E-02 -2.0487E-03 8.0795E-05

[0198] Table 18-2

[0199] Figure 20A The on-axis chromatic aberration curve of the second optical system of Embodiment 9 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system. Figure 20BThe astigmatism curves of the second optical system of Embodiment 9 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 20C The distortion curves of the second optical system in Embodiment 9 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 20A to 20C It can be seen that the second optical system given in Example 9 can achieve good imaging quality.

[0200] 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 1 and the second optical system of embodiment 8. 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 9. 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 2 and the second optical system of embodiment 8. 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 9. 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 of embodiment 3 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 8. 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 9.

[0201] The above 18 virtual reality devices satisfy the relationships shown in Tables 19-1, 19-2, and 19-3, respectively.

[0202] Conditional / Example Combination 1+4 1+5 1+6 1+7 1+8 1+9 |f1B+f5B| / fA 0.67 0.05 2.54 0.06 0.36 0.05 (CT1A+CT2A) / (|R9B+R10B|) 5.04 2.05 4.50 0.06 4.45 0.13 R1A / (R1B+R2B) 28.91 47.55 30.55 118.79 49.23 114.52 (fA / EPDA)×(fB / EPDB) 7.38 8.73 7.38 8.56 8.73 8.73 FG2A / (f2B+f3B) 3.21 3.37 3.25 3.17 3.45 3.37 R2A / (R3B+R4B) 7.23 3.13 7.63 4.20 6.79 3.45 (fA×tan(FOVA / 2)) / (fB×tan(FOVB / 2)) 4.24 9.76 3.60 8.87 7.00 9.67 CT2A / (T45B+CT5B) 2.68 2.02 2.06 1.29 1.89 1.81 TDA / (tan(FOVB / 2))(mm) 3.54 7.94 2.98 7.17 5.68 7.67 |R3A| / (CT1A+CTQA) 7.01 7.01 7.01 7.01 7.01 7.01 TDA / (CTFA+CTRA+CTQA) 12.49 12.49 12.49 12.49 12.49 12.49 (R6B-R5B) / (R7B+R8B) 2.53 1.75 2.46 2.22 2.23 1.85

[0203] Table 19-1

[0204]

[0205]

[0206] Table 19-2

[0207] Conditional / Example Combination 3+4 3+5 3+6 3+7 3+8 3+9 |f1B+f5B| / fA 0.60 0.05 2.27 0.06 0.33 0.04 (CT1A+CT2A) / (|R9B+R10B|) 3.68 1.50 3.29 0.04 3.25 0.09 R1A / (R1B+R2B) 26.09 42.90 27.56 107.17 44.41 103.32 (fA / EPDA)×(fB / EPDB) 7.34 8.69 7.34 8.51 8.69 8.69 FG2A / (f2B+f3B) 3.52 3.70 3.57 3.48 3.79 3.71 R2A / (R3B+R4B) 9.19 3.99 9.71 5.35 8.64 4.39 (fA×tan(FOVA / 2)) / (fB×tan(FOVB / 2)) 4.74 10.92 4.03 9.93 7.84 10.82 CT2A / (T45B+CT5B) 3.67 2.76 2.82 1.76 2.59 2.48 TDA / (tan(FOVB / 2))(mm) 3.81 8.55 3.21 7.72 6.11 8.26 |R3A| / (CT1A+CTQA) 14.35 14.35 14.35 14.35 14.35 14.35 TDA / (CTFA+CTRA+CTQA) 14.95 14.95 14.95 14.95 14.95 14.95 (R6B-R5B) / (R7B+R8B) 2.53 1.75 2.46 2.22 2.23 1.85

[0208] Table 19-3

[0209] 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, The first optical system comprises a filter, a reflective polarizing element, a quarter-wave plate, a first lens and a second lens in sequence from the human eye side to the image side along a first optical axis, wherein the first lens has positive focal power, the second lens has positive or negative focal power, the near-human eye side of the first lens is convex and the near-image side is convex, the near-human eye side of the second lens is concave and the near-image side is convex or flat, the reflective polarizing element is attached to the near-image side of the filter, the quarter-wave plate is attached to the near-human eye side of the first lens, and the number of lenses with focal power in the first optical system is two. The second optical system comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence from the object side to the image side along a second optical axis, wherein the first lens has negative focal power, the second lens has positive focal power, the third lens has positive focal power, the fourth lens and the fifth lens have focal powers with different positive and negative properties, the object side and the image side of the first lens are both concave, the object side of the second lens is concave and the image side is convex, the object side and the image side of the third lens are both convex, the object side of the fourth lens is concave and the image side is convex, the object side of the fifth lens is convex, and the number of lenses with focal power in the second optical system is five. The first optical system further comprises a partial reflection element attached to the near-image side of the first lens, the near-human eye side of the second lens or the near-image side of the second lens. The 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 transmit the real image to the display screen, and the virtual reality device satisfies: 0<|f1B+f5B| / fA≤2.54, 0< (CT1A+CT2A) / (|R9B+R10B|)≤5.04, 3.13≤R2A / (R3B+R4B)≤11.79 and 7.00≤(fA / EPDA)×(fB / EPDB)≤8.73, wherein fA is the effective focal length of the first optical system, f1B is the effective focal length of the first lens, f5B is the effective focal length of the fifth lens, 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, R9B is the curvature radius of the object side of the fifth lens, R10B is the curvature radius of the image side of the fifth lens, R2A is the curvature radius of the near-image side of the first lens, R3B is the curvature radius of the object side of the second lens, R4B is the curvature radius of the image side of the second lens, EPDA is the entrance pupil diameter of the first optical system, fB is the effective focal length of the second optical system, and EPDB is the entrance pupil diameter of the second optical system. ​ 2. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 26.09 ≤ R1A / (R1B+R2B) ≤ 133.64, where R1A is a radius of curvature of a proximal eye side surface of the first lens, R1B is a radius of curvature of an object side surface of the first lens, and R2B is a radius of curvature of an image side surface of the first lens.

3. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 3.17 ≤ FG2A / (f2B+f3B) ≤ 3.79, where FG2A is a combined focal length of the quarter wave plate and the first lens, f2B is an effective focal length of the second lens, and f3B is an effective focal length of the third lens.

4. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 1.29 ≤ CT2A / (T45B+CT5B) < 3.7, where CT2A is a center thickness of the second lens on the first optical axis, T45B is an air separation of the fourth lens and the fifth lens on the second optical axis, and CT5B is a center thickness of the fifth lens on the second optical axis.

5. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 7 < |R3A| / (CT1A+CTQA) ≤ 30.38, where R3A is a radius of curvature of a proximal eye side surface of the second lens, CT1A is a center thickness of the first lens on the first optical axis, and CTQA is a center thickness of the quarter wave plate on the first optical axis.

6. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 9.3 < TDA / (CTFA+CTRA+CTQA) ≤ 14.95, where TDA is a distance from a proximal eye side surface of the first lens to a proximal image side surface of the second lens on the first optical axis, CTFA is a center thickness of the filter on the first optical axis, CTRA is a center thickness of the reflective polarizing element on the first optical axis, and CTQA is a center thickness of the quarter wave plate on the first optical axis.

7. The virtual reality device of claim 1, wherein, The virtual reality device satisfies: 1.75 ≤ (R6B-R5B) / (R7B+R8B) ≤ 2.53, where R5B is a radius of curvature of an object side surface of the third lens, R6B is a radius of curvature of an image side surface of the third lens, R7B is a radius of curvature of an object side surface of the fourth lens, and R8B is a radius of curvature of an image side surface of the fourth lens.

8. The virtual reality apparatus of any one of claims 1-7, wherein, The virtual reality device satisfies: 3.60 ≤ (fA x tan(FOVA / 2)) / (fB x tan(FOVB / 2)) ≤ 10.92, where fA is an effective focal length of the first optical system, FOVA is a maximum field of view angle of the first optical system, fB is an effective focal length of the second optical system, and FOVB is a maximum field of view angle of the second optical system.

9. The virtual reality apparatus of any one of claims 1-7, wherein, The virtual reality device satisfies: 2.18 mm ≤ TDA / (tan(FOVB / 2)) ≤ 8.55 mm, where TDA is a distance from a proximal eye side surface of the first lens to a proximal image side surface of the second lens on the first optical axis, and FOVB is a maximum field of view angle of the second optical system.

Images