Lens group, optical system, head-mounted display device and display system

Abstract

The utility model provides a lens group, an optical system, a head-mounted display device and a display system, the lens group can be applied to imaging of image light, and the image light emitted by an image source is shaped by the lens group and then enters human eyes for imaging. And the aspheric part can meet the high-resolution requirement of human eyes on a central view field. The annular protruding parts sequentially surrounding the aspheric surface part are equivalent to a Fresnel lens, image light in a larger range can be collected, and in other words, the image light in the larger range can be collected and focused by the array annular protruding parts. The first lens is mainly responsible for bearing most of focal power of the lens group, and the second lens is mainly responsible for correcting residual aberration of the first lens, so that the imaging effect of the lens group is optimized while the focusing capability of the lens group is ensured. In conclusion, the lens group provided by the utility model can focus the central view field on the premise of not losing the resolution of the central view field, and can collect the image light of the edge view field in a larger range beyond the central view field.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and in particular to a lens assembly, an optical system, a head-mounted display device, and a display system. Background Art

[0002] Based on the visual habits of the human eye, the human eye can only have high requirements for the resolution of the central field of view, but does not have too high requirements for the resolution of the edge field of view. At the same time, the larger the field of view angle observed by the human eye, the better the experience. In the lens group currently used to image the image source, if high-resolution imaging is desired, the field of view angle of the lens group will be small, that is, it is impossible to collect image light over a large range. If the field of view angle of the lens group is designed to be large, that is, if image light needs to be collected over a large range, then the image in the central area cannot be guaranteed to have high resolution. That is, in the current lens group imaging process, it is impossible to take into account both high-resolution imaging and large-scale collection of image light. How to achieve high-resolution shaping of the image in the central field of view, and at the same time, to collect a large range of image light, is a technical problem that needs to be solved in this field. Utility Model Content

[0003] In view of this, the present application provides a lens group, an optical system, a head-mounted display device and a display system, which can perform high-resolution shaping of the image in the central field of view and simultaneously collect a wide range of image light.

[0004] In order to solve the above technical problems, the utility model provides a lens group, including a first lens and a second lens; the surface of the first lens facing the human eye is a first light-emitting surface, and the surface shape of the first light-emitting surface is a smooth aspherical surface and the optical focal length is positive; the surface of the first lens facing the screen is a first light-incoming surface, and the first light-incoming surface includes: an aspherical portion, located in the middle part of the first lens, the optical axis of the first lens passes through the center of the aspherical portion, and the optical focal length of the aspherical portion is positive; and an array annular convex portion, including a plurality of convex portions arranged in a ring, and the plurality of convex portions are sequentially arranged around the aspherical portion; the surface of the second lens facing the screen is a second light-incoming surface, and the surface of the second lens facing the human eye is a second light-emitting surface, and the second light-incoming surface and the second light-emitting surface are both smooth aspherical surfaces.

[0005] Optionally, the optical focal length of the aspheric portion is greater than four times the optical focal length of the second light incident surface, and the optical focal length of the aspheric portion is greater than four times the optical focal length of the second light emitting surface.

[0006] Optionally, the second lens is located between the human eye and the first lens, and a second light-clearance aperture of the second lens is smaller than or equal to a first light-clearance aperture of the first lens.

[0007] Optionally, the optical power of the second light-emitting surface is positive.

[0008] Optionally, the second lens is located between the screen and the first lens, and the first light-passing aperture of the first lens is less than or equal to the second light-passing aperture of the second lens.

[0009] Optionally, the optical power of the second light-emitting surface is negative.

[0010] Optionally, the included angle between the non-working surface of each protrusion facing the optical axis of the first lens and the optical axis of the first lens is a draft angle θ, and the draft angle θ increases successively in the direction away from the optical axis of the first lens; the increment △θ of the draft angle θ relative to the adjacent draft angle θ facing the optical axis of the first lens satisfies: 0.01° < △θ < 5°.

[0011] Optionally, the draft angle θ satisfies the condition: 0.95 * the included angle between the outgoing light on the working surface of the protrusion facing away from the optical axis of the first lens and the optical axis of the first lens < the draft angle θ < 1.05 * the included angle between the incident light on the working surface of the protrusion facing away from the optical axis of the first lens and the optical axis of the first lens.

[0012] Optionally, the first protrusion pitch d1 between adjacent protrusions on the first light-incident surface satisfies the condition: 0.1 mm < d1 < 5 mm, and the height h1 of the protrusion satisfies the condition: 0.01 mm < h1 < 0.9 mm; and the aspherical semi-aperture R of the aspherical part > 5 * the first protrusion pitch d1.

[0013] Optionally, the aperture of the aspherical part satisfies the condition: 0.2 * the aperture of the first lens < the aperture of the aspherical part < 0.8 * the aperture of the first lens.

[0014] Optionally, the minimum distance d2 between the first lens and the second lens satisfies the condition: 0.2 mm < the minimum distance d2 < 10 mm.

[0015] Optionally, the first lens thickness d3 at the optical axis of the first lens satisfies the condition: 4 mm < the first lens thickness d3 < 20 mm.

[0016] Optionally, the second lens thickness d4 at the optical axis of the second lens satisfies the condition: 2 mm < the second lens thickness d4 < 10 mm.

[0017] Optionally, the radius of curvature of the first light-incident surface at the optical axis > 1.5 * the radius of curvature of the second light-incident surface at the optical axis.

[0018] Optionally, the relationship between the optical focal power φ1 of the first lens and the total optical focal power φ of the lens group satisfies the condition: 0.7<φ1 / φ<1.5; the relationship between the optical focal power φ2 of the second lens and the total optical focal power φ of the lens group satisfies the condition: -0.4<φ2 / φ<0.5.

[0019] Optionally, the first lens and the second lens are both made of optical plastic, and their refractive indices both satisfy the condition: 1.46<refractive index<1.69; and their dispersion coefficients both satisfy the condition: 40<dispersion coefficient<69.

[0020] In another embodiment, the present invention provides an optical system comprising: two aforementioned lens groups, the two lens groups being used for a left-eye viewing component and a right-eye viewing component respectively, and the left-eye viewing component and the right-eye viewing component being symmetrically distributed left and right.

[0021] Optionally, the optical system is applied to a virtual reality device or an augmented reality device, and the system further includes: a fixing structure for fixing the two lens groups.

[0022] Optionally, the optical system further comprises a housing, wherein the lens group is accommodated in the housing.

[0023] In another embodiment, the present invention provides a head-mounted display device, comprising the aforementioned optical system and a head-mounted component, wherein the head-mounted component is connected to the optical system, and the head-mounted component is used to be worn on a person's head.

[0024] Optionally, the head-mounted display device further includes: a camera, wherein the lens of the camera faces the human eye.

[0025] In another embodiment, the present invention provides a display system, which is a virtual reality and / or augmented reality display system, and the display system includes a signal input module and the aforementioned head-mounted display device, and the head-mounted display device receives the signal from the signal input module and processes the signal.

[0026] Optionally, the signal input module includes a handle controller electrically connected to the head-mounted display device.

[0027] Optionally, the display system is a virtual and / or augmented reality display all-in-one machine, and the display system further includes a processing module, and the processing module is communicatively connected to the handle controller.

[0028] The beneficial effects of the present invention are embodied in that the lens group of the present application can be used to image image light, the image source is set on the light input side of the lens group, the human eye is located on the light output side of the lens group, and the image light emitted by the image source is shaped by the lens group and incident on the human eye for imaging. The aspheric portion can meet the high-resolution requirements of the human eye for the central field of view. The annular raised portions sequentially surrounding the aspheric portion can be equivalent to a Fresnel lens, and the array of annular raised portions can collect image light in a wider range, that is, image light in a wider range can be collected and focused by the array of annular raised portions. The first lens is mainly responsible for assuming most of the optical power of the lens group, and the second lens is mainly responsible for correcting the residual aberration of the first lens, ensuring the focusing ability of the lens group while optimizing the imaging effect of the lens group. In summary, the lens group of the present application can focus on the central field of view without losing the resolution of the central field of view, and can collect image light from a wider range of edge fields outside the central field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Shown is a structural schematic diagram of a lens assembly provided in one embodiment of the present application.

[0030] Figure 2 Shown is a schematic structural diagram of another lens assembly provided in another embodiment of the present application.

[0031] Figure 3 FIG. 1 is a cross-sectional view of the first lens in the lens assembly according to an embodiment of the present application.

[0032] Figure 4 Shown is a schematic structural diagram of a display system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0034] Example 1

[0035] Figure 1 The figure shows a schematic diagram of the structure of a lens assembly provided by an embodiment of the present application. The present application provides a lens assembly, such as Figure 1As shown, the lens assembly 1 includes a first lens 10 and a second lens 11. The surface of the first lens 10 facing the eye 3 is a first light-emitting surface 100, which is a smooth aspherical surface with positive optical power. The surface of the first lens 10 facing the screen 2 is a first light-incoming surface 101, which includes an aspherical portion 102 and an array of annular raised portions 103.

[0036] The aspheric portion 102 is located in the middle of the first lens 10. The optical axis of the first lens 10 passes through the center of the aspheric portion 102, and the optical power of the aspheric portion 102 is positive. The array of annular raised portions 103 includes a plurality of raised portions 1031 arranged in a circular pattern, which are sequentially arranged around the aspheric portion 102. The optical power of the entire surface of the array of annular raised portions 103 is positive, that is, the overall optical power of the first light-entering surface 101 is positive.

[0037] The surface of the second lens 11 facing the screen 2 is a second light-incoming surface 111 , and the surface of the second lens 11 facing the human eye 3 is a second light-emitting surface 110 . Both the second light-incoming surface 111 and the second light-emitting surface 110 are smooth aspherical surfaces.

[0038] When in use, this embodiment can be applied to image light. A screen 2, serving as an image source, is positioned on the light-entry side of the lens assembly 1, and a human eye 3 is positioned on the light-exit side of the lens assembly 1. Image light emitted from the screen 2 is shaped by the lens assembly 1 before entering the human eye 3 for imaging. Specifically, the lens assembly 1 can collimate and expand the pupil of the image light emitted from each pixel of the screen 2, serving as the image source. After shaping, the image light emitted from each pixel becomes collimated light, and the human eye can perceive the image corresponding to the collimated and expanded image light on the focal plane of the lens assembly 1.

[0039] When image light enters the aspheric portion 102 and the array of annular raised portions 103 on the first light-entering surface 101 of the first lens 10, the optical power of the first light-entering surface 101 is initially positive, so the entire first light-entering surface 101 focuses the image light to a certain extent. The aspheric portion 102 located in the center of the first lens 10 focuses the image light. Compared to the surrounding annular raised portions 103, the smooth aspheric portion 102 achieves clearer imaging, namely, clearer focus and pupil expansion in a small area of ​​the central field of view.

[0040] Based on the human eye's visual habits, the human eye only has high requirements for resolution in the central field of view, but not for resolution in the peripheral fields of view. Therefore, the aspheric portion 102 can meet the human eye's high-resolution requirements for the central field of view. The annular raised portions 1031 surrounding the aspheric portion 102 can be equivalent to a Fresnel lens, allowing the array of annular raised portions 103 to collect and focus image light from a wider range.

[0041] Based on the principle of a Fresnel lens, the array of annular raised portions 103 reduces stray light in the peripheral fields of view outside the central field of view, achieves high light transmittance, and minimizes aberrations. Compared to other types of lens systems, at the same distance from the screen 2 serving as the image source, the array of annular raised portions 103 in the lens system 1 of the present application can collect and focus image light from a larger area. Compared to an aspheric lens without an array of annular raised portions, with the same image light collection and focusing capabilities, an aspheric lens requires a thicker thickness and greater curvature to collect and focus image light from a larger range. However, the array of annular raised portions 103 in the lens system 1 of the present application can make the first lens 10 thinner and lighter.

[0042] In lens assembly 1, the first light-emitting surface 100 has a positive optical power. The cooperation between the first light-emitting surface 100 and the first light-incoming surface 101 enhances the focusing capability of the first lens 10. While providing a strong focusing effect, the second lens 11 corrects aberrations, improving the overall imaging quality of lens assembly 1.

[0043] In summary, the lens assembly 1 of this embodiment is able to focus the central field of view without sacrificing resolution in the central field of view, and can also collect image light from a wider range of peripheral fields outside the central field of view. The first lens 10 is primarily responsible for assuming the majority of the focal length of the lens assembly 1, while the second lens 11 is primarily responsible for correcting the residual aberrations of the first lens 10, thereby ensuring the focusing capability of the lens assembly 1 while optimizing the imaging effect of the lens assembly 1.

[0044] Optionally, the optical power of the aspheric portion 102 is greater than four times the optical power of the second light-incoming surface 111, and the optical power of the aspheric portion 102 is greater than four times the optical power of the second light-exiting surface 110. In this embodiment, the optical power of the aspheric portion 102 is limited to enhance the focusing capability of the aspheric portion 102, allowing the first lens 10 to assume the primary focusing function of the lens assembly 1. The focusing function of the second lens 11 is relatively small. Based on the optical path simulation of the first lens 10, the aspheric surface shape of the second lens 11 is designed so that the second lens 11 corrects the aberrations of the first lens 10.

[0045] Alternatively, as Figure 1As shown, the second lens 11 is located between the human eye 3 and the first lens 10, and the second clear aperture of the second lens 11 is smaller than or equal to the first clear aperture of the first lens 10. Because both the first light-entry surface 101 and the first light-exit surface 100 of the first lens 10 focus, the waist radius of the light beam after passing through the first lens 10 is smaller, so the size of the second clear aperture can be reduced. The area outside the clear aperture of the second lens 11 is used for aberration correction. The smaller second clear aperture can increase the aberration correction area of ​​the second lens 11.

[0046] Alternatively, as Figure 1 As shown, when the second lens 11 is located between the human eye 3 and the first lens 10, the optical power of the second light-emitting surface 110 is positive. Since the second lens 11 is located between the human eye 3 and the first lens 10, the second light-emitting surface 110 with a positive optical power can further focus the image light emitted by the first lens 10, thereby further improving the focusing ability of the entire lens assembly 1, allowing the human eye 3 to be closer to the lens assembly 1, thereby reducing the space between the human eye 3 and the lens assembly 1.

[0047] Alternatively, as Figure 2 As shown, the second lens 11 is located between the screen 2 and the first lens 10, and the first light-clearing aperture of the first lens 10 is smaller than or equal to the second light-clearing aperture of the second lens 11. Since both the first light-incoming surface 101 and the first light-outgoing surface 100 of the first lens 10 are focused, and since the image light first passes through the second lens 11, it is necessary to ensure that more image light passes through the second lens 11. Therefore, the size of the second light-clearing aperture is designed to be larger to ensure that sufficient image light enters the first lens 10.

[0048] Optionally, when the second lens 11 is located between the screen 2 and the first lens 10, the optical power of the second light-emitting surface 110 is negative. Since the second lens 11 is located between the human eye 3 and the first lens 10, the second light-emitting surface 110 with a negative optical power can diverge the image light emitted from the screen 2, thereby allowing more image light to enter the first lens 10.

[0049] Figure 3 FIG. 1 is a cross-sectional view of the first lens in the lens assembly provided by an embodiment of the present application. Figure 3As shown, the angle between the non-working surface 1032 of each raised portion 1031 facing the optical axis of the first lens 10 and the optical axis of the first lens 10 is a draft angle θ. The draft angle θ increases in a direction away from the optical axis of the first lens 10. The increase Δθ of the draft angle θ relative to the adjacent draft angle θ facing the optical axis of the first lens 10 satisfies the following: 0.01° < Δθ < 5°. The raised portion 1031 appears as a sawtooth shape in a cross-sectional view. The raised portion 1031 may have two surfaces. One surface faces the optical axis of the first lens 10, which is the non-working surface 1032 and is generally not illuminated by image light. The draft angle θ is the angle between the non-working surface 1032 of the raised portion 1031 and the optical axis of the first lens 10. The other surface of the raised portion 1031 faces away from the optical axis of the first lens 10, which is the working surface and is illuminated by image light. Since the optical focal length of the first light-entering surface 101 where the array annular raised portion 103 is located is positive and the first light-entering surface 101 is convex, the draft angle θ gradually increases, causing the angle between the working surface and the optical axis to gradually increase. The closer the working surface is to the edge of the first lens 10, the less likely it is to be blocked by other non-working surfaces and unable to receive image light. Under such a structure, the working surface of the raised portion 1031 can receive image light from a wider range, which can increase the transmittance of the entire first lens 10. As the angle between the working surface and the optical axis gradually increases, the working surface with a gradually changing angle receives image light from the range facing the working surface, and stray light from other ranges will be blocked by other non-working surfaces, which can effectively reduce stray light.

[0050] Optionally, the draft angle θ corresponding to each protrusion 1031 on the first lens 10 satisfies the following condition: 0.95*the angle between the outgoing light on the working surface of the protrusion 1031 facing away from the optical axis of the first lens 10 and the optical axis of the first lens 10<draft angle θ<1.05*the angle between the incident light on the working surface of the protrusion 1031 facing away from the optical axis of the first lens 10 and the optical axis of the first lens 10.

[0051] When image light is directed toward the working surface, the light that strikes the working surface of a particular raised portion 1031 is the incident light corresponding to that working surface, while the light that passes through the working surface and enters the interior of the raised portion 1031 is the outgoing light corresponding to that working surface. Provided that each raised portion 1031 meets the above conditions, the image light can be guaranteed to strike the working surface, and non-working surfaces will not excessively block the image light.

[0052] Optionally, the first protrusion pitch d1 between adjacent protrusion portions 1031 on the first light-incident surface 101 satisfies the condition: 0.1 mm < d1 < 5 mm, and the height h1 of the protrusion portion 1031 satisfies the condition: 0.01 mm < h1 < 0.9 mm; and the aspherical semi-aperture R of the aspherical portion 102 > 5 * the first protrusion pitch d1. When the protrusion pitch satisfies the above conditions, the protrusion portions 1031 in the array annular protrusion portion 103 can be dense enough with respect to each other to well achieve the function and effect equivalent to a Fresnel lens, and the protrusion portions 1031 being dense enough with respect to each other can also reduce the annular fringe phenomenon in the image formed after the image light passes through the lens group 1. The aspherical portion 102 is substantially equivalent to an aspherical lens, and the aspherical semi-aperture R of the aspherical portion 102 refers to half of the aperture of the aspherical lens. When the aspherical semi-aperture R satisfies the above conditions, the size of the aspherical portion 102 can be sufficient, and the aspherical portion 102 can focus the image light in the central field of view, thereby ensuring that the image resolution in the central field of view is high enough to meet the high-resolution requirements of the human eye for the central field of view.

[0053] Optionally, the aperture of the aspherical portion 102 satisfies the condition: 0.2 * the aperture of the first lens 10 < the aperture of the aspherical portion 102 < 0.8 * the aperture of the first lens 10. Limiting the apertures of the first lens 10 and the aspherical portion 102 can ensure that the size of the aspherical portion 102 is large enough to clearly image a larger area of the central image.

[0054] Optionally, the minimum distance d2 between the first lens 10 and the second lens 11 satisfies the condition: 0.2 mm < minimum distance d2 < 10 mm. When the distance between the first lens 10 and the second lens 11 satisfies the above conditions, the overall occupied space of the lens group 1 can be small, and when the lens distance satisfies this value, the basic optical design conditions can be met, and under this numerical condition, the required optical design can be completed.

[0055] Optionally, the first lens thickness d3 at the optical axis of the first lens 10 satisfies the condition: 4 mm < first lens thickness d3 < 20 mm. This enables the first lens 10 to achieve miniaturization and ensure the imaging quality.

[0056] Optionally, the second lens thickness d4 at the optical axis of the second lens 11 satisfies the condition: 2 mm < second lens thickness d4 < 10 mm. This enables the second lens 11 to achieve miniaturization and ensure the imaging quality.

[0057] For the second lens 11 and the first lens 10 having an aspheric portion and an array of annular convex portions, when the lens thickness at the optical axis meets the above conditions, it can save space while having a sufficient optical focal length, thereby being able to focus or defocus light.

[0058] Optionally, the radius of curvature of the first light-entering surface 101 at the optical axis is greater than 1.5*the radius of curvature of the second light-entering surface 111 at the optical axis. By limiting the curvature of the first lens 10 having the aspheric portion 102 at the optical axis, the size of the aspheric portion 102 is not too large. The aspheric portion 102 only focuses the image light in the central field of view, and the array of annular raised portions 103 surrounding the aspheric portion 102 can normally collect image light outside the central field of view. This ensures that the image resolution of the central field of view is high enough to meet the human eye's high-resolution requirements for the central field of view, and also improves the ability to collect image light outside the central field of view.

[0059] Optionally, the relationship between the focal power φ1 of the first lens 10 and the total focal power φ of the lens assembly 1 satisfies the following conditions: 0.7 < φ1 / φ < 1.5; and the relationship between the focal power φ2 of the second lens 11 and the total focal power φ of the lens assembly 1 satisfies the following conditions: -0.4 < φ2 / φ < 0.5. Limiting the focal power of the first lens 10 and the second lens 11 can limit the distance range and focusing range between the two lenses, allowing them to work together to achieve better imaging results.

[0060] Optionally, both the first lens 10 and the second lens 11 are made of optical plastic, and their refractive indices satisfy the following conditions: 1.46 < refractive index < 1.69; and their Abbe number satisfies the following conditions: 40 < Abbe number < 69. Limiting the refractive index and Abbe number ensures that the image light passing through the first lens 10 and the second lens 11 achieves better color accuracy and chromaticity.

[0061] Example 2

[0062] The utility model provides an optical system, which comprises two lens groups mentioned above. The two lens groups are respectively used for a left-eye viewing component and a right-eye viewing component. The left-eye viewing component and the right-eye viewing component are symmetrically distributed.

[0063] The optical system can also be applied to virtual reality devices or augmented reality devices. The optical system also includes a fixing structure for fixing the two lens groups.

[0064] The optical system further comprises a housing, wherein the lens group is accommodated in the housing.

[0065] Example 3

[0066] The present invention also provides a head-mounted display device, comprising the aforementioned optical system and a head-mounted assembly, the head-mounted assembly being connected to the optical system and being designed to be worn on a person's head. The head-mounted assembly includes a glasses frame, the glasses frame including temples, and the optical system is secured between the temples. In this embodiment, the temples can be hung on the user's ears, thereby conveniently allowing the head-mounted display device to be worn on the user's head, providing the user with a virtual reality or augmented reality display.

[0067] Optionally, the head-mounted display device further includes a camera, with the camera lens facing the human eye, thereby performing eye tracking.

[0068] Example 4

[0069] Figure 4 The present invention also provides a display system, which is a virtual reality and / or augmented reality display system. Figure 4 As shown, the display system includes a signal input module 13 and the aforementioned head-mounted display device. The head-mounted display device receives signals from the signal input module 13 and transmits them to the head-mounted display device for processing. The signal input module 13 includes a handle controller electrically connected to the head-mounted display device. Optionally, the display system is an all-in-one virtual and / or augmented reality display device, and the processing module 4 is also used to control the handle controller.

[0070] In some embodiments, as Figure 4 As shown, the display system further includes a memory 15 , the processing module 4 and the signal input module 13 are electrically connected respectively, and the memory 15 is used to store executable instructions of the processing module 4 .

[0071] When in use, the processing module 4 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the display system to perform desired functions.

[0072] The memory 15 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Non-volatile memory may include, for example, read-only memory (ROM), a hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processing module 4 may execute the program instructions to control the handle controller.

[0073] The signal input module 13 may be interconnected with the processing module 4 via a bus system and / or other forms of connection mechanisms (not shown). The signal input module 13 may include, for example, a keyboard, a mouse, a joystick, a touch screen, and the like.

[0074] Of course, to simplify, Figure 4 Only some of the components in the display system related to the present invention are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, the display system may further include any other appropriate components according to specific application conditions.

[0075] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0076] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0077] It should also be noted that in the devices and apparatuses of the present application, the components can be decomposed and / or reassembled, and such decompositions and / or reassemblies should be regarded as equivalent solutions of the present application.

[0078] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features of the present application.

[0079] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A lens assembly, characterized in that: It includes a first lens and a second lens; The surface of the first lens facing the human eye is the first light-emitting surface, the surface shape of the first light-emitting surface is a smooth aspherical surface and its optical power is positive; The surface of the first lens facing the screen is the first light-incident surface, and the first light-incident surface includes: An aspherical part, located in the middle part of the first lens, the optical axis of the first lens passes through the center of the aspherical part, and the optical power of the aspherical part is positive; And An array of annular protrusions, including a plurality of protrusions arranged in a ring, and the plurality of protrusions are sequentially arranged around the aspherical part; The surface of the second lens facing the screen is the second light-incident surface, the surface of the second lens facing the human eye is the second light-emitting surface, and both the second light-incident surface and the second light-emitting surface are smooth aspherical surfaces.

2. The lens assembly according to claim 1, wherein: The optical power of the aspherical part is greater than four times the optical power of the second light-incident surface, and the optical power of the aspherical part is greater than four times the optical power of the second light-emitting surface.

3. The lens assembly according to claim 1, wherein: The second lens is located between the human eye and the first lens, and the second light-passing aperture of the second lens is less than or equal to the first light-passing aperture of the first lens.

4. The lens group according to claim 3, wherein The optical power of the second light-emitting surface is positive.

5. The lens assembly according to claim 1, wherein: The second lens is located between the screen and the first lens, and the first light-passing aperture of the first lens is less than or equal to the second light-passing aperture of the second lens.

6. The lens group according to claim 5, wherein The optical power of the second light-emitting surface is negative.

7. The lens group according to claim 1, wherein The included angle between the non-working surface of each protrusion facing the optical axis of the first lens and the optical axis of the first lens is the draft angle θ, and the draft angle θ increases sequentially in the direction away from the optical axis of the first lens; the increase value △θ of the draft angle θ relative to the adjacent draft angle θ facing the optical axis of the first lens satisfies: 0.01° < △θ < 5°.

8. The lens assembly according to claim 7, wherein: The draft angle θ satisfies the condition: 0.95 * the included angle between the outgoing light on the working surface of the protrusion facing away from the optical axis of the first lens and the optical axis of the first lens < the draft angle θ < 1.05 * the included angle between the incident light on the working surface of the protrusion facing away from the optical axis of the first lens and the optical axis of the first lens.

9. The lens assembly according to claim 1, wherein: The first protrusion pitch d1 between adjacent protrusions on the first light-incident surface satisfies the condition: 0.1 mm < d1 < 5 mm, and the height h1 of the protrusion satisfies the condition: 0.01 mm < h1 < 0.9 mm; and the aspherical semi-aperture R of the aspherical part > 5 * the first protrusion pitch d1.

10. The lens assembly according to claim 1, wherein: The aperture of the aspherical part satisfies the condition: 0.2 * the aperture of the first lens < the aperture of the aspherical part < 0.8 * the aperture of the first lens.

11. The lens assembly according to claim 1, wherein: The minimum distance d2 between the first lens and the second lens satisfies the condition: 0.2 mm < the minimum distance d2 < 10 mm.

12. The lens assembly according to claim 1, wherein: The thickness d3 of the first lens at the optical axis of the first lens satisfies the condition: 4 mm < the thickness d3 of the first lens < 20 mm.

13. The lens assembly according to claim 12, wherein: The thickness d4 of the second lens at the optical axis of the second lens satisfies the condition: 2mm<the second lens thickness d4<10mm.

14. The lens assembly according to claim 1, wherein: The curvature radius of the first light incident surface at the optical axis is greater than 1.5*the curvature radius of the second light incident surface at the optical axis.

15. The lens assembly according to claim 1, wherein: The relationship between the focal power φ1 of the first lens and the total focal power φ of the lens group satisfies the condition: 0.7<φ1 / φ<1.5; the relationship between the focal power φ2 of the second lens and the total focal power φ of the lens group satisfies the condition: -0.4<φ2 / φ<0.

5.

16. The lens assembly according to claim 1, wherein: The materials of the first lens and the second lens are both optical plastics, and the refractive index meets the condition: 1.46<refractive index<1.69; the dispersion coefficient meets the condition: 40<dispersion coefficient<69.

17. An optical system, characterized in that include: Two lens groups according to any one of claims 1 to 16, wherein the two lens groups are respectively used for a left-eye viewing component and a right-eye viewing component, and the left-eye viewing component and the right-eye viewing component are symmetrically distributed.

18. The optical system according to claim 17, wherein: Applied to a virtual reality device or an augmented reality device, the system further includes: The fixing structure is used to fix the two lens groups.

19. The optical system according to claim 17, wherein: Also includes: The lens group is accommodated in the housing.

20. A head-mounted display device, characterized in that: include: The optical system according to any one of claims 17 to 19; as well as A head-worn component is connected to the optical system, and the head-worn component is used to be worn on a person's head.

21. The head-mounted display device according to claim 20, wherein: Also includes: A camera, wherein the lens of the camera faces the human eye.

22. A display system, wherein the display system is a virtual reality and / or augmented reality display system, characterized in that: The display system includes a signal input module and a head-mounted display device as described in claim 20 or 21, and the head-mounted display device receives the signal from the signal input module and processes the signal.

23. The display system according to claim 22, wherein: The signal input module includes a handle controller electrically connected to the head-mounted display device.

24. The display system according to claim 23, wherein: The display system is a virtual and / or augmented reality display all-in-one machine, and the display system also includes a processing module, and the processing module is communicatively connected to the handle controller.

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