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

Abstract

The application provides a lens group, an optical system, a head-mounted display device and a display system. The lens group of the application can be applied to image image light. An image source is arranged on the light inlet side of the lens group, and a human eye is located on the light outlet side of the lens group. Image light emitted by the image source is incident on the human eye for imaging after being shaped by the lens group. The first aspheric surface part of the first lens can meet the high resolution requirement of the human eye for the central field of view. The annular convex parts around the first aspheric surface part in sequence can be equivalent to a Fresnel lens. The first array annular convex part can collect a larger range of image light, that is, a larger range of image light can be collected and focused by the first array annular convex part, and the thickness of the lens is ensured to be not too thick. The lens group of the application can focus the central field of view without losing the resolution of the central field of view, and can collect image light of a larger range of edge fields of view outside the central field of view.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, specifically to lens groups, optical systems, head-mounted display devices, and display systems. Background Technology

[0002] Based on human visual habits, the human eye only requires high resolution in the central field of view, while having less demanding requirements for resolution in the peripheral field of view. Furthermore, the larger the field of view observed by the human eye, the better the viewing experience. Currently, in lens groups used for imaging image sources, if high-resolution imaging is desired, the field of view of the lens group is relatively small, meaning it cannot collect image light over a wide area. If the field of view of the lens group is designed to be large, meaning that if image light needs to be collected over a wide area, the image in the central region cannot guarantee high resolution. In other words, current lens imaging processes cannot simultaneously achieve high-resolution imaging and large-area image light collection. How to achieve high-resolution imaging of the central field of view while simultaneously collecting image light over a wide area is a technical problem that needs to be solved in this field. Summary of the Invention

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

[0004] To solve the above-mentioned technical problems, the present invention provides a lens assembly, including two imaging lenses, wherein the lens closer to the screen is a first lens and the lens closer to the human eye is a second lens; the surface of the first lens facing the human eye is a first light-emitting surface, the surface shape of the first light-emitting surface is a smooth aspherical surface and the optical power is negative; the surface of the first lens facing the screen is a first light-entering surface, the first light-entering surface including: a first aspherical portion located in the middle part of the first lens, the optical axis of the first lens passing through the center of the first aspherical portion, and the optical power of the first aspherical portion being positive; and a first array of annular protrusions including a plurality of first protrusions arranged in a ring, the plurality of first protrusions being sequentially arranged around the first aspherical portion; the surface of the second lens facing the human eye is a second light-emitting surface, the surface shape of the second light-emitting surface is a smooth aspherical surface and the optical power is negative; the surface of the second lens facing the screen is a second light-entering surface, the second light-entering surface including: a second array of annular protrusions including a plurality of second protrusions arranged in a ring.

[0005] Optionally, the second light-gathering surface further includes: a second aspherical portion, the diameter of which is less than 1 / 2 of the diameter of the first aspherical portion, and the optical power of the second aspherical portion is positive; wherein, a plurality of second protrusions are sequentially arranged around the second aspherical portion.

[0006] Optionally, the included angle between the non-working surface of each of the first protrusions facing the first lens optical axis and the first lens optical axis is a first draft angle θ1, and the first draft angle θ1 increases sequentially in the direction away from the first lens optical axis; the increase value △θ of the first draft angle θ1 relative to the adjacent first draft angle θ1 facing the first lens optical axis satisfies: 0.01° < △θ < 5°; the included angle between the non-working surface of each of the second protrusions facing the optical axis of the lens and the second lens optical axis is a second draft angle θ2, and the second draft angle θ2 increases sequentially in the direction away from the second lens optical axis, and the increase value △θ of each second draft angle θ2 relative to the adjacent draft angle facing the second lens optical axis satisfies: 0.01° < △θ < 5°.

[0007] Optionally, the first draft angle θ1 satisfies the condition: 0.95 * the included angle between the outgoing light on the working surface of the first protrusion facing away from the first lens optical axis and the first lens optical axis < the first draft angle θ1 < 1.05 * the included angle between the incident light on the working surface of the first protrusion facing away from the first lens optical axis and the first lens optical axis; the second draft angle θ2 satisfies the condition: 0.95 * the included angle between the outgoing light on the working surface of the second protrusion facing away from the second lens optical axis and the second lens optical axis < the second draft angle θ2 < 1.05 * the included angle between the incident light on the working surface of the second protrusion facing away from the second lens optical axis and the second lens optical axis.

[0008] Optionally, the first protrusion pitch d1 between adjacent first protrusions on the first light incident surface satisfies the condition: 0.1 mm < d1 < 5 mm, and the height h1 of the first protrusion satisfies the condition: 0.01 mm < h1 < 0.9 mm; and the first semi-aperture R1 of the first aspherical portion > 5 * the first protrusion pitch d1; the second protrusion pitch d2 between adjacent second protrusions on the second light incident surface satisfies the condition: 0.1 mm < d2 < 5 mm, and the height h2 of the second protrusion satisfies the condition: 0.01 mm < h2 < 0.9 mm; and the second semi-aperture R2 of the second aspherical portion > 5 * the second protrusion pitch d2.

[0009] Optionally, the aperture of the first aspherical portion satisfies the condition: 0.1 * the aperture of the first light incident surface < the aperture of the first aspherical portion < 0.9 * the aperture of the first light incident surface.

[0010] Optionally, the minimum distance L between the first lens and the second lens satisfies the condition: 0.1 mm < the minimum distance L < 10 mm.

[0011] Optionally, the thickness of the first lens at the optical axis of the first lens satisfies the condition: 4mm < first lens thickness < 20mm.

[0012] Optionally, the thickness of the second lens at the optical axis of the second lens satisfies the condition: 0.8mm < second lens thickness < 0.9 * first lens thickness.

[0013] Optionally, the radius of curvature of the first light-gathering surface at the optical axis is greater than 1.5 * the radius of curvature of the second light-gathering surface at the optical axis.

[0014] Optionally, the relationship between the optical power φ1 of the first lens and the total optical power φ of the lens group satisfies the condition: 0.1 < φ1 / φ < 0.7; the relationship between the optical power φ2 of the second lens and the total optical power φ of the lens group satisfies the condition: 0.3 < φ2 / φ < 0.9.

[0015] Optionally, both the first lens and the second lens are made of optical plastic, and their refractive indices both meet the condition: 1.46 < refractive index < 1.69; their dispersion coefficients both meet the condition: 40 < dispersion coefficient < 69.

[0016] 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, the left-eye viewing component and the right-eye viewing component being symmetrically distributed from left to right.

[0017] 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.

[0018] Optionally, the optical system also includes a housing in which the lens group is housed.

[0019] In another embodiment, the present invention provides a head-mounted display device, including the aforementioned optical system and a head-wearing component, the head-wearing component being connected to the optical system and for wearing on a person's head.

[0020] Optionally, the head-mounted display device further includes a camera, the lens of which faces the human eye.

[0021] In another embodiment, the present invention provides a display system, which is a virtual reality and / or augmented reality display system. The display system includes a signal input module and the aforementioned head-mounted display device, wherein the head-mounted display device receives signals from the signal input module and processes the signals.

[0022] Optionally, the signal input module includes a handle controller electrically connected to the head-mounted display device.

[0023] Optionally, the display system is a virtual and / or augmented reality all-in-one display, and the display system further includes a processing module, which is communicatively connected to the game controller.

[0024] The beneficial effects of this invention are as follows: The lens group of this application can be used to image light. The image source is placed on the light-inlet side of the lens group, and the human eye is located on the light-outlet side of the lens group. The image light emitted from the image source is shaped by the lens group and then enters the human eye for imaging. The aspherical portion can meet the high-resolution requirement of the human eye for the central field of view. The annular protrusions surrounding the aspherical portion can be equivalent to a Fresnel lens. The array of annular protrusions can collect a wider range of image light, that is, a wider range of image light can be collected and focused by the array of annular protrusions. In the lens group, the optical power of all light-outlet optical surfaces is negative, which allows the focal plane to be located far from the lens group. The human eye does not need to be close to the lens group to view the image light corresponding to the image light, enabling the lens group of this application to achieve long-distance imaging. In summary, the lens group of this application can focus the central field of view without sacrificing the resolution of the central field of view, and can collect image light from a wider range of edge fields of view outside the central field of view. Attached Figure Description

[0025] Figure 1 The diagram shown is a schematic diagram of a lens assembly provided in an embodiment of this application.

[0026] Figure 2 The image shown is a cross-sectional view of the first lens in a lens group provided in an embodiment of this application.

[0027] Figure 3 The image shown is a cross-sectional view of the second lens in a lens group provided in an embodiment of this application.

[0028] Figure 4 The diagram shown is a schematic diagram of the structure of a display system provided in an embodiment of this application. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] Example 1

[0031] Figure 1The diagram shown is a structural schematic of a lens assembly according to an embodiment of this application. This application provides a lens assembly, such as... Figure 1 As shown, the lens group 1 includes two imaging lenses, wherein the lens closer to the screen 2 is the first lens 10, and the lens closer to the human eye 3 is the second lens 11.

[0032] The surface of the first lens 10 facing the human eye is the first light-emitting surface 100, which has a smooth aspherical shape and a negative optical power. The surface of the first lens 10 facing the screen 2 is the first light-entering surface 101, which includes a first aspherical portion 102 and a first array of annular protrusions 103.

[0033] The first aspherical 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 first aspherical portion 102, and the optical power of the first aspherical portion 102 is positive. The first array annular protrusion portion 103 includes a plurality of first protrusions 1031 arranged in a ring, which are sequentially arranged around the first aspherical portion 102. Furthermore, the optical power of the entire surface of the first array annular protrusion portion 103 is positive, meaning the overall optical power of the first light-gathering surface 101 is positive.

[0034] The surface of the second lens 11 facing the human eye 3 is the second light-emitting surface 110. The surface of the second light-emitting surface 110 is a smooth aspherical surface and has a negative optical power. The surface of the second lens 11 facing the screen 2 is the second light-entry surface 111. The second light-entry surface 111 includes a second array of annular protrusions 113, which includes a plurality of second protrusions 1131 arranged in a ring.

[0035] In this embodiment, the image light emitted from the screen 2, which serves as the image source, is positioned on the light-inlet side of the lens group 1, while the human eye 3 is located on the light-outlet side of the lens group 1. The image light emitted from the screen 2 is shaped by the lens group 1 and then enters the human eye 3 to form an image. Specifically, the lens group 1 can collimate and dilate the image light emitted from each pixel of the screen 2, which serves as the image source. After being shaped, the image light emitted from each pixel becomes collimated light, and the human eye can view the image corresponding to the collimated and dilated image light at the focal plane of the lens group 1.

[0036] When image light is incident on the first aspherical portion 102 and the first array annular protrusion portion 103 on the first light-incident surface 101 of the first lens 10, the optical power of the first light-incident surface 101 is initially positive, thus the first light-incident surface 101 as a whole will focus the image light to a certain extent. The first aspherical portion 102 located in the middle of the first lens 10 focuses the image light. Compared with the surrounding first array annular protrusion portion 103, the smooth first aspherical portion 102 can achieve clearer imaging, that is, it can focus more clearly and dilate the pupil in a small area of ​​the central field of view.

[0037] Based on the visual habits of the human eye, the human eye only has high requirements for the resolution of the central field of view, while the resolution of the peripheral field of view is not very high. Therefore, the first aspherical portion 102 can meet the human eye's requirement for high resolution in the central field of view. The annular first protrusions 1031 surrounding the first aspherical portion 102 can be equivalent to Fresnel lenses, enabling the first array of annular protrusions 103 to collect a wider range of image light, that is, a wider range of image light can be collected and focused by the first array of annular protrusions 103. Furthermore, the second array of annular protrusions 113 can further collect a wider range of image light, improving the effect of collecting and focusing a wider range of image light.

[0038] Based on the principle of Fresnel lenses, the first array of annular protrusions 103 and the second array of annular protrusions 113 reduce stray light in the edge fields of view outside the central field of view, resulting in high light transmittance and small aberrations. Compared to other types of lens groups, at the same distance from the screen 2, which serves as the image source, the first array of annular protrusions 103 and the second array of annular protrusions 113 in the lens group 1 of this application can collect and focus image light over a larger area. Compared to aspherical mirrors without annular protrusions, under the same image light collection and focusing capabilities, aspherical mirrors require greater thickness and curvature to collect and focus a wider range of image light. However, the first array of annular protrusions 103 and the second array of annular protrusions 113 in the lens group 1 of this application allow the first lens 10 and the second lens 11 to be thinner and lighter.

[0039] In lens group 1, the optical power of both the first light-emitting surface 100 and the second light-emitting surface 110 is negative. That is, all light-emitting optical surfaces introduce negative optical power into the image light. The optical power of the light-emitting and light-entry optical surfaces determines the distance between the focal plane position of the image light after it has been shaped by lens group 1 and lens group 1, thus determining the viewing position of the human eye in the light-emitting direction of lens group 1. With all light-emitting optical surfaces having negative optical power, the focal plane position is farther from lens group 1, so the human eye does not need to be close to lens group 1 to view the image corresponding to the image light, enabling lens group 1 of this application to achieve long-distance imaging.

[0040] In summary, the lens group 1 of this embodiment can focus the central field of view without sacrificing the resolution of the central field of view, and can collect image light from a larger range of edge fields of view beyond the central field of view.

[0041] Optionally, such as Figure 1 As shown, the second light-gathering surface 111 also includes a second aspherical portion 112. The aperture of the second aspherical portion 112 is less than half the aperture of the first aspherical portion 102, and the optical power of the second aspherical portion 112 is positive. Multiple second protrusions 1131 are sequentially arranged around the second aspherical portion 112. An aspherical portion is also provided on the second lens 11. The second aspherical portion 112 focuses the image light. Compared to the surrounding second array of annular protrusions 113, the smooth second aspherical portion 112 can achieve clearer imaging, that is, it can more clearly focus and expand the pupil in a small area of ​​the central field of view, meeting the high-resolution requirements of the human eye for the central field of view.

[0042] Figure 2 The image shown is a cross-sectional view of the first lens in a lens group provided in an embodiment of this application. Figure 3 The image shown is a cross-sectional view of the second lens in a lens assembly provided in an embodiment of this application. Figure 2 As shown, the angle between the non-working surface 1032 of each first protrusion 1031 facing the optical axis of the first lens 10 and the optical axis of the lens 10 is denoted as the first draft angle θ1. The multiple first draft angles θ1 corresponding to the multiple first protrusions 1031 increase sequentially in the direction away from the optical axis of the first lens 10. Between two adjacent first draft angles θ1, the increase Δθ between the first draft angle θ1 located away from the optical axis of the first lens 10 and the first draft angle θ1 located towards the optical axis of the first lens 10 satisfies: 0.01° < Δθ < 5°. Similarly, as... Figure 3 As shown, the angle between the non-working surface of each second protrusion 1131 facing the optical axis of the second lens 11 and the optical axis of the second lens 11 is denoted as the second draft angle θ2. The second draft angle θ2 increases sequentially in the direction away from the optical axis of the second lens 11. The increase value Δθ of each second draft angle θ2 relative to the adjacent draft angle facing the optical axis of the second lens 11 satisfies: 0.01° < Δθ < 5°.

[0043] The first protrusion 1031 appears as a sawtooth shape in cross-section. The first protrusion 1031 may have two surfaces. One surface faces the optical axis of the first lens 10; this surface is a non-working surface, and image light generally does not illuminate it. The first draft angle θ1 is the angle between the non-working surface of the first protrusion 1031 and the optical axis of the first lens 10. The other surface of the first protrusion 1031 faces away from the optical axis of the first lens 10; this surface is the working surface, and image light illuminates it. Since the optical power of the first light-gathering surface 101, where the first array annular protrusion 103 is located, is positive, and the first light-gathering surface 101 is convex, the first draft angle θ1 gradually increases, causing the angle between the working surface and the optical axis to gradually increase. The working surface closer to the edge of the first lens 10 is less likely to be blocked by other non-working surfaces from receiving image light. With this structure, the working surface of the first protrusion 1031 can receive a wider range of image light, increasing the overall light transmittance of the first lens 10. As the angle between the working surface and the optical axis gradually increases, the working surface with the gradually changing angle receives the image light in the range that the working surface is facing, while stray light in other ranges is blocked by other non-working surfaces, which can effectively reduce stray light.

[0044] Similarly, the second protrusion 1131 appears as a sawtooth shape in cross-section. The second protrusion 1131 can have two surfaces. One surface faces the optical axis of the second lens 11; this surface is a non-working surface, and image light generally does not illuminate this non-working surface. The second draft angle θ2 is the angle between the non-working surface of the second protrusion 1131 and the optical axis of the second lens 11. The other surface of the second protrusion 1131 faces away from the optical axis of the second lens 11; this surface is the working surface, and image light illuminates this working surface. Since the optical power of the second light-gathering surface 111, where the second array annular protrusion 113 is located, is positive, and the second light-gathering surface 111 is convex, the second draft angle θ2 gradually increases, causing the angle between the working surface and the optical axis to gradually increase. The working surface closer to the edge of the second lens 11 is less likely to be blocked by other non-working surfaces from receiving image light. With this structure, the working surface of the second protrusion 1131 can receive a wider range of image light, which can increase the overall light transmittance of the second lens 11. As the angle between the working surface and the optical axis gradually increases, the working surface with the gradually changing angle receives the image light in the range that the working surface is facing, while stray light in other ranges is blocked by other non-working surfaces, which can effectively reduce stray light.

[0045] Optionally, the first draft angle θ1 corresponding to each of the first protrusions 1031 on the first lens 10 satisfies the following condition: 0.95 * the angle between the outgoing light from the working surface of the first protrusion 1031 facing away from the optical axis of the first lens 10 and the optical axis of the first lens 10 < the first draft angle θ1 < 1.05 * the angle between the incident light from the working surface of the first protrusion 1031 facing away from the optical axis of the first lens 10 and the optical axis of the first lens 10.

[0046] Each second draft angle θ2 corresponding to each second convex portion 1131 on the second lens 11 satisfies the condition: 0.95 * the angle between the outgoing light on the working surface of the second convex portion 1131 facing away from the optical axis of the second lens 11 and the optical axis of the second lens 11 < the second draft angle θ2 < 1.05 * the angle between the incident light on the working surface of the second convex portion 1131 facing away from the optical axis of the second lens 11 and the optical axis of the second lens 11.

[0047] When the image light irradiates the working surface, on a certain first convex portion 1031 or second convex portion 1131, the light rays irradiating on the working surface of the convex portion are the incident light corresponding to the working surface, and the light rays incident into the convex portion after passing through the working surface are the outgoing light corresponding to the working surface. On the premise that each convex portion satisfies the above conditions, it can be ensured that the light rays of the image light can irradiate on the working surface, and the non-working surface will not excessively block the light rays of the image light.

[0048] Optionally, referring to Figure 1 、 Figure 2 and Figure 3 , the first convex spacing d1 between adjacent first convex portions 1031 on the first light incident surface 101 satisfies the condition: 0.1 mm < d1 < 5 mm, and the height h1 of the first convex portion 1031 satisfies the condition: 0.01 mm < h1 < 0.9 mm; and the first semi-aperture R1 of the first aspherical portion 102 > 5 * the first convex spacing d1. The second convex spacing d2 between adjacent second convex portions 1131 on the second light incident surface 111 satisfies the condition: 0.1 mm < d2 < 5 mm, and the height h2 of the second convex portion 1131 satisfies the condition: 0.01 mm < h2 < 0.9 mm. The second semi-aperture R2 of the second aspherical portion 112 > 5 * the second convex spacing d2. When the convex spacing satisfies the above conditions, the convex portions in the array annular convex portion can be made dense enough with respect to each other to well realize the function and effect equivalent to that of a Fresnel lens, and the convex portions 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 first aspherical portion 102 is substantially equivalent to an aspherical lens. The first semi-aperture R1 of the first aspherical portion 102 refers to half of the aperture of the aspherical lens. The second semi-aperture R2 of the second aspherical portion 112 refers to half of the aperture of the aspherical lens. When the first semi-aperture R1 and the second semi-aperture R2 satisfy the above conditions, the sizes of the first aspherical portion 102 and the second aspherical portion 112 can be made sufficient, and the first aspherical portion 102 and the second aspherical portion 112 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.

[0049] Optionally, the aperture of the first aspherical portion 102 satisfies the condition: 0.1 * aperture of the first light-gathering surface 101 < aperture of the first aspherical portion 102 < 0.9 * aperture of the first light-gathering surface 101. Limiting the apertures of the first light-gathering surface 101 and the first aspherical portion 102 ensures that the size of the first aspherical portion 102 is large enough to clearly image the center of a larger area.

[0050] Optionally, the minimum distance L between the first lens 10 and the second lens 11 satisfies the condition: 0.1mm < minimum distance L < 10mm. When the distance between the first lens 10 and the second lens 11 satisfies the above condition, the overall space occupied by the lens group 1 is smaller, and when the lens distance meets this value, the basic optical design conditions can be met, and the required optical design can be completed under this value condition.

[0051] Optionally, the thickness of the first lens at the optical axis of the first lens 10 satisfies the condition: 4mm < first lens thickness < 20mm. This allows the first lens to be miniaturized while ensuring image quality.

[0052] Optionally, the thickness of the second lens 11 at its optical axis satisfies the condition: 0.8mm < second lens thickness < 0.9 * first lens thickness. This allows the second lens to be miniaturized while maintaining image quality. For both the first lens 10 and the second lens 11, which simultaneously have aspherical portions and arrayed annular protrusions, when the lens thickness at its optical axis meets the above condition, sufficient optical power can be achieved while saving space, thus enabling the focusing or defocusing of light.

[0053] Optionally, the radius of curvature of the first light-gathering surface 101 at the optical axis is greater than 1.5 * the radius of curvature of the second light-gathering surface 111 at the optical axis. By limiting the curvature at the optical axis of the first lens 10 with the first aspherical portion 102, the size of the first aspherical portion 102 is prevented from becoming excessive. The first aspherical portion 102 focuses only on the image light in the central field of view, while the first array of annular protrusions 103 surrounding the first aspherical portion 102 can normally collect image light outside the central field of view. This ensures that the image resolution in the central field of view is sufficiently high to meet the high resolution requirements of the human eye for the central field of view, and also improves the ability to collect image light outside the central field of view.

[0054] Optionally, the relationship between the optical power φ1 of the first lens and the total optical power φ of the lens group satisfies the condition: 0.1 < φ1 / φ < 0.7; the relationship between the optical power φ2 of the second lens and the total optical power φ of the lens group satisfies the condition: 0.3 < φ2 / φ < 0.9. Limiting the optical power of the first and second lenses can define the distance range and focusing range between the two lenses, allowing them to work together to achieve better imaging results.

[0055] Optionally, both the first lens 10 and the second lens 11 are made of optical plastic, and both have a refractive index that meets the condition: 1.46 < refractive index < 1.69; and a dispersion coefficient that meets the condition: 40 < dispersion coefficient < 69. Limiting the refractive index and dispersion coefficient ensures that the image light transmitted through the first lens 10 and the second lens 11 achieves better color accuracy and chromaticity.

[0056] Example 2

[0057] 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, the left-eye viewing component and the right-eye viewing component being symmetrically distributed from left to right.

[0058] This optical system can also be used in virtual reality or augmented reality devices. The optical system also includes a fixing structure for fixing the two lens groups.

[0059] The optical system also includes a housing, within which the lens assembly is housed.

[0060] Example 3

[0061] The present invention also provides a head-mounted display device, including the aforementioned optical system and a head-wearing assembly. The head-wearing assembly is connected to the optical system and is worn on a person's head. The head-wearing assembly includes an eyeglass frame with temples, and the optical system is fixed between the temples. In this embodiment, the temples can be hung on the user's ears, thereby allowing the head-mounted display device to be conveniently worn on the user's head, providing virtual reality or augmented reality displays.

[0062] Optionally, the head-mounted display device also includes a camera with its lens facing the user's eyes for eye tracking.

[0063] Example 4

[0064] Figure 4 The diagram shown is a structural schematic of the display system of the present invention. The present invention also provides a display system, which is a virtual reality and / or augmented reality display system, such as... Figure 4As 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 a virtual and / or augmented reality all-in-one display, and the processing module 4 is also used to control the handle controller.

[0065] In some embodiments, such as Figure 4 As shown, the display system also includes a memory 15. The processing module 4 and the signal input module 13 are electrically connected respectively. The memory 15 is used to store the executable instructions of the processing module 4.

[0066] In use, the processing module 4 can be a central processing unit (CPU) or other form of processing unit with data processing and / or instruction execution capabilities, and can control other components in the display system to perform the desired functions.

[0067] 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), 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.

[0068] The signal input module 13 can be interconnected with the processing module 4 via a bus system and / or other forms of connection mechanism (not shown). The signal input module 13 may include, for example, a keyboard, mouse, joystick, and touch screen.

[0069] Of course, for the sake of simplicity, Figure 4 Only some of the components in the display system relevant to this invention are shown; components such as buses, input / output interfaces, etc., are omitted. In addition, the display system may include any other suitable components depending on the specific application.

[0070] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0071] The block diagrams of devices, apparatuses, devices, 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 those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0072] It should also be noted that the components in the apparatus and equipment of this application can be disassembled and / or reassembled. These disassemblies and / or reassemblies should be considered as equivalent solutions of this application.

[0073] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be applied within the widest scope consistent with the principles and novel features of this application.

[0074] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lens assembly, characterized in that, It includes two imaging lenses, with the lens closer to the screen being the first lens and the lens closer to the human eye being the second lens; The surface of the first lens facing the human eye is the first light-emitting surface, and the surface shape of the first light-emitting surface is a smooth aspherical surface with a negative optical power. The surface of the first lens facing the screen is the first light-increasing surface, which includes: A first aspherical portion is located in the middle of the first lens, the optical axis of the first lens passes through the center of the first aspherical portion, and the optical power of the first aspherical portion is positive; and The first array of annular protrusions includes a plurality of first protrusions arranged in a ring, and the plurality of first protrusions are sequentially arranged around the first aspherical portion. The surface of the second lens facing the human eye is the second light-emitting surface, which has a smooth aspherical shape and a negative optical power; the surface of the second lens facing the screen is the second light-receiving surface, which includes: The second array of annular protrusions includes a plurality of second protrusions arranged in an annular pattern; The angle between the non-working surface of each of the first protrusions facing the optical axis of the first lens and the optical axis of the first lens is the first draft angle θ1. The first draft angle θ1 increases sequentially in the direction away from the optical axis of the first lens. The increase Δθ of the first draft angle θ1 relative to the adjacent first draft angle θ1 facing the optical axis of the first lens satisfies: 0.01° < Δθ < 5°. The angle between the non-working surface of each of the second protrusions facing the optical axis of the second lens and the optical axis of the second lens is the second draft angle θ2. The second draft angle θ2 increases sequentially in the direction away from the optical axis of the second lens. The increase value Δθ of each second draft angle θ2 relative to the adjacent draft angle facing the optical axis of the second lens satisfies: 0.01° < Δθ < 5°.

2. The lens assembly according to claim 1, characterized in that, The second light-gathering surface also includes: The second aspherical portion has an aperture smaller than half the aperture of the first aspherical portion, and the optical power of the second aspherical portion is positive. The second protrusions are arranged sequentially around the second aspherical portion.

3. The lens assembly according to claim 1, characterized in that, The first draft angle θ1 satisfies the following condition: 0.95 The angle between the emitted light from the working surface of the first protrusion facing away from the optical axis of the first lens and the optical axis of the first lens is less than the first draft angle θ1, which is less than 1.

05. The angle between the incident light on the working surface of the first protrusion facing away from the optical axis of the first lens and the optical axis of the first lens; The second draft angle θ2 satisfies the following condition: 0.95 The angle between the emitted light from the working surface of the second protrusion facing away from the optical axis of the second lens and the optical axis of the second lens is less than the second draft angle θ2, which is less than 1.

05. The angle between the incident light on the working surface of the second protrusion facing away from the optical axis of the second lens and the optical axis of the second lens.

4. The lens assembly according to claim 2, characterized in that, The first protrusion pitch d1 between adjacent first protrusion parts on the first light incident surface satisfies the condition: 0.1 mm < d1 < 5 mm, and the height h1 of the first protrusion part satisfies the condition: 0.01 mm < h1 < 0.9 mm; and the first semi-aperture R1 of the first aspherical part > 5 The first protrusion pitch d1; The second protrusion pitch d2 between adjacent second protrusion parts on the second light incident surface satisfies the condition: 0.1 mm < d2 < 5 mm, and the height h2 of the second protrusion part satisfies the condition: 0.01 mm < h2 < 0.9 mm; and the second semi-aperture R2 of the second aspherical part > 5 The second protrusion pitch d2.

5. The lens assembly according to claim 1, characterized in that, The aperture of the first aspherical portion meets the following condition: 0.1 The aperture of the first light-gathering surface is less than the aperture of the first aspherical portion, which is less than 0.

9. First light-gathering aperture diameter.

6. The lens assembly according to claim 1, characterized in that, The minimum distance L between the first lens and the second lens satisfies the following condition: 0.1mm < the minimum spacing L < 10mm.

7. The lens assembly according to claim 1, characterized in that, The thickness of the first lens at the optical axis of the first lens satisfies the following condition: 4mm < thickness of the first lens < 20mm.

8. The lens assembly according to claim 7, characterized in that, The thickness of the second lens at the optical axis of the second lens satisfies the following condition: 0.8mm < second lens thickness < 0.9mm The thickness of the first lens.

9. The lens assembly according to claim 1, characterized in that, The radius of curvature of the first light-gathering surface at the optical axis is >1.

5. The radius of curvature of the second light-gathering surface at the optical axis.

10. The lens assembly according to claim 1, characterized in that, The relationship between the optical power φ1 of the first lens and the total optical power φ of the lens group satisfies the condition: 0.1 < φ1 / φ < 0.7; the relationship between the optical power φ2 of the second lens and the total optical power φ of the lens group satisfies the condition: 0.3 < φ2 / φ < 0.

9.

11. The lens assembly according to claim 1, characterized in that, Both the first and second lenses are made of optical plastic, and their refractive indices meet the condition: 1.46 < refractive index < 1.69; their dispersion coefficients meet the condition: 40 < dispersion coefficient < 69.

12. An optical system, characterized in that, include: Two lens groups as described in any one of claims 1 to 11, the two lens groups being used for a left-eye viewing component and a right-eye viewing component respectively, the left-eye viewing component and the right-eye viewing component being symmetrically distributed.

13. The optical system according to claim 12, characterized in that, The system, applied to virtual reality or augmented reality devices, further includes: A fixing structure is used to fix the two lens groups.

14. The optical system according to claim 12, characterized in that, Also includes: The housing contains the lens assembly.

15. A head-mounted display device, characterized in that, include: The optical system as described in any one of claims 12 to 14; as well as A head-wearing assembly, connected to the optical system, for wearing on a person's head.

16. The head-mounted display device according to claim 15, characterized in that, Also includes: A camera, wherein the lens of the camera faces the human eye.

17. A display system, said display system being 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 15 or 16, wherein the head-mounted display device receives signals from the signal input module and processes the signals.

18. The display system according to claim 17, characterized in that, The signal input module includes a handle controller electrically connected to the head-mounted display device.

19. The display system according to claim 18, characterized in that, The display system is a virtual and / or augmented reality all-in-one display machine, and the display system also includes a processing module, which is communicatively connected to the game controller.

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