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

Abstract

The invention 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, an image source is arranged on the light inlet side of the lens group, human eyes are located on the light outlet side of the lens group, and the image light emitted by the image source is shaped by the lens group and then enters the human eyes for imaging. The first aspheric part of the first lens can meet the high-resolution requirement of human eyes for a central field of view. The annular protrusions sequentially surrounding the first aspheric portion can be equivalent to a Fresnel lens, the first array annular protrusions can collect image light in a larger range, that is, the image light in the larger range can be collected and focused by the first array annular protrusions, and it is guaranteed that the lens is not too thick. The lens group can focus the central field of view on the premise of not losing the resolution of the central field of view, and can collect image light of an edge field of view in a larger range beyond the central field of view.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and in particular to a lens group, 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 not 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 smaller, that is, the image light cannot be collected over a large range. If the field of view angle of the lens group is designed to be larger, that is, if image light needs to be collected over a large range, the image in the central area cannot guarantee high resolution. That is, in the current imaging process of the lens group, 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 collect a large range of image light, is a technical problem that needs to be solved in this field. Summary of the invention

[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 and imaging of the image in the central field of view, and at the same time collect a wide range of image light.

[0004] In order to solve the above technical problems, the present invention provides a lens group, including two imaging lenses, wherein the lens close to the screen is a first lens, and the lens close 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 focal length is a negative value; the surface of the first lens facing the screen is a first light-incoming surface, the first light-incoming surface includes: a first aspherical surface portion, located in the middle part of the first lens, the optical axis of the first lens passes through the center of the first aspherical surface portion, and the optical focal length of the first aspherical surface portion is a positive value; and a first array annular convex portion, including a plurality of first convex portions arranged in a ring shape, and the plurality of first convex portions are sequentially arranged around the first aspherical surface 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 focal length is a negative value; the surface of the second lens facing the screen is a second light-incoming surface, the second light-incoming surface includes: a second array annular convex portion, including a plurality of second convex portions arranged in a ring shape.

[0005] Optionally, the second light-entering surface also includes: a second aspheric portion, the aperture of the second aspheric portion is smaller than 1 / 2 of the aperture of the first aspheric portion, and the optical focal length of the second aspheric portion is positive; wherein a plurality of the second protrusions are sequentially arranged around the second aspheric 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, a first lens thickness at the optical axis of the first lens satisfies the condition: 4 mm<thickness of the first lens<20 mm.

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

[0013] Optionally, a radius of curvature of the first light incident surface at the optical axis>1.5*a radius of curvature of the second light incident surface at the optical axis.

[0014] 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: 0.1<φ1 / φ<0.7; 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: 0.3<φ2 / φ<0.9.

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

[0016] In another embodiment, the present invention provides an optical system, comprising: two of the aforementioned lens groups, 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 left and 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 further comprises a housing, wherein the lens group is accommodated in the housing.

[0019] In another embodiment, the present invention provides a head-mounted display device, including 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.

[0020] Optionally, the head-mounted display device further includes: a camera, wherein the lens of the camera 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, 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.

[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 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.

[0024] 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-incoming side of the lens group, the human eye is located on the light-outgoing side of the lens group, and the image light emitted by the image source is incident on the human eye for imaging after being shaped by the lens group. The aspherical part can meet the high-resolution requirements of the human eye for the central field of view. The annular convex parts surrounding the aspherical part in sequence can be equivalent to the Fresnel lens, and the array annular convex parts can collect a wider range of image light, that is, a wider range of image light can be collected and focused by the array annular convex parts. In the lens group, the optical focal length of all light-emitting optical surfaces is a negative value, which can make the focal plane position far away from the lens group, and the human eye does not need to be close to the lens group to view the image corresponding to the image light, so that the lens group of the present application can achieve long-distance imaging. 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 of the edge field of view in a larger range outside the central field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Shown is a schematic structural diagram of a lens assembly provided in one embodiment of the present application.

[0026] Figure 2 Shown is a cross-sectional view of the first lens in a lens group provided in an embodiment of the present application.

[0027] Figure 3 FIG. 4 is a cross-sectional view of a second lens in a lens group provided in an embodiment of the present application.

[0028] Figure 4 Shown is a schematic diagram of the structure of a display system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Embodiment 1

[0031] Figure 1FIG. 1 is 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 1 As shown, the lens group 1 includes two imaging lenses, wherein the lens close to the screen 2 is the first lens 10 , and the lens close 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, and the surface shape of the first light emitting surface 100 is a smooth aspherical surface with a negative optical power. The surface of the first lens 10 facing the screen 2 is the first light incident surface 101, and the first light incident surface 101 includes a first aspherical surface portion 102 and a first array annular convex portion 103.

[0033] The first aspheric surface 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 aspheric surface portion 102, and the optical power of the first aspheric surface portion 102 is positive. The first array annular convex portion 103 includes a plurality of first convex portions 1031 arranged in an annular shape, and the plurality of first convex portions 1031 are sequentially arranged around the first aspheric surface portion 102. The optical power of the entire surface of the first array annular convex portion 103 is positive, that is, the overall optical power of the first light-entering 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 with a negative optical power. The surface of the second lens 11 facing the screen 2 is the second light entering surface 111. The second light entering surface 111 includes a second array annular convex portion 113. The second array annular convex portion 113 includes a plurality of second convex portions 1131 arranged in an annular shape.

[0035] When in use, this embodiment can be applied to image light, and the screen 2 as the image source is arranged on the light-incoming side of the lens group 1, and the human eye 3 is located on the light-exiting side of the lens group 1. The image light emitted from the screen 2 is shaped by the lens group 1 and then incident on the human eye 3 for imaging. Specifically, the lens group 1 can collimate and expand the pupil of the image light emitted from each pixel point of the screen 2 as the image source, and the image light emitted from each pixel point becomes collimated light after being shaped, and the human eye can see the image corresponding to the collimated and expanded pupil image light on the focal plane of the lens group 1.

[0036] When the image light enters the first aspheric surface portion 102 and the first array annular convex portion 103 on the first light-entering surface 101 of the first lens 10, the optical focal length of the first light-entering surface 101 is positive, so the first light-entering surface 101 as a whole will focus the image light to a certain extent. The first aspheric surface portion 102 located in the middle of the first lens 10 focuses the image light, and compared with the surrounding first array annular convex portion 103, the smooth first aspheric surface portion 102 can achieve clearer imaging, that is, it can focus and expand the pupil more clearly in a small area of ​​the central field of view.

[0037] 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 not too high requirements for the resolution of the edge field of view. Therefore, the first aspheric portion 102 can meet the human eye's high-resolution requirements for the central field of view. The annular first convex portion 1031 that surrounds the first aspheric portion 102 in sequence can be equivalent to a Fresnel lens, so that the first array annular convex portion 103 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 portion 103. Further, the second array annular convex portion 113 can further collect a larger range of image light, thereby improving the effect of collecting and focusing a larger range of image light.

[0038] Based on the principle of Fresnel lens, the first array annular convex portion 103 and the second array annular convex portion 113 make the edge field of view outside the central field of view have less stray light, high transmittance and small aberration. Compared with other types of lens groups, at the same distance from the screen 2 as the image source, the first array annular convex portion 103 and the second array annular convex portion 113 in the lens group 1 of the present application can collect and focus image light in a larger area. Compared with an aspherical mirror without an array annular convex portion, under the same image light collection ability and focusing ability, the aspherical mirror needs to be thicker and have a larger curvature to collect and focus image light in a larger range, while the first array annular convex portion 103 and the second array annular convex portion 113 in the lens group 1 of the present application can make the first lens 10 and the second lens 11 thinner.

[0039] In the lens group 1, the focal powers of the first light-emitting surface 100 and the second light-emitting surface 110 are both negative values, that is, all light-emitting optical surfaces bring negative focal powers to the image light, and the focal powers of the light-emitting optical surface and the light-incoming optical surface can determine the distance of the focal plane position of the image light after being shaped by the lens group 1 from the lens group 1, that is, determine the viewing position of the human eye in the light-emitting direction of the lens group 1. When the focal powers of all light-emitting optical surfaces are negative values, the focal plane position can be far away from the lens group 1, and the human eye does not need to be close to the lens group 1 to view the image corresponding to the image light, so that the lens group 1 of the present application can achieve long-distance imaging.

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

[0041] Alternatively, if Figure 1 As shown, the second light-entering surface 111 also includes a second aspheric surface portion 112, the aperture of the second aspheric surface portion 112 is less than 1 / 2 of the aperture of the first aspheric surface portion 102, and the optical focal length of the second aspheric surface portion 112 is positive. Among them, a plurality of second protrusions 1131 are sequentially arranged around the second aspheric surface portion 112. An aspheric surface portion is also arranged on the second lens 11, and the second aspheric surface portion 112 focuses the image light. Compared with the surrounding second array annular protrusions 113, the smooth second aspheric surface portion 112 can achieve clearer imaging, that is, it can focus and expand the pupil more clearly on 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 Shown is a cross-sectional view of the first lens in a lens group provided in an embodiment of the present application. Figure 3 FIG. 1 is a cross-sectional view of the second lens in the lens group provided by an embodiment of the present 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 recorded as the first draft angle θ1, and the first draft angles θ1 corresponding to the first protrusions 1031 increase in sequence in the direction away from the optical axis of the first lens 10. Between two adjacent first draft angles θ1, the first draft angle θ1 away from the optical axis of the first lens 10 and the first draft angle θ1 facing the optical axis of the first lens 10, the increase value △θ of the two satisfies: 0.01°<△θ<5°. Similarly, 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 recorded as a second draft angle θ2, and the second draft angle θ2 increases successively in the direction away from the optical axis of the second lens 11, and the increase value △θ of each second draft angle θ2 relative to the adjacent draft angle toward the optical axis of the second lens 11 satisfies: 0.01°<△θ<5°.

[0043] The first raised portion 1031 is in a sawtooth shape in the cross-sectional view. The first raised portion 1031 may have two surfaces, one of which faces the optical axis of the first lens 10. This surface is a non-working surface, and the image light generally does not shine on this non-working surface. The first draft angle θ1 is the angle between the non-working surface of the first raised portion 1031 and the optical axis of the first lens 10. The other surface of the first raised portion 1031 faces away from the optical axis of the first lens 10. This surface is a working surface, and the image light shines on this working surface. Since the optical focal length of the first light-incoming surface 101 where the first array annular raised portion 103 is located is a positive value, and the first light-incoming surface 101 is in a convex shape, the first draft angle θ1 gradually increases, so that the angle between the working surface and the optical axis gradually increases. 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 first raised portion 1031 can receive a wider range of image light, 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.

[0044] Similarly, the second raised portion 1131 is in a sawtooth shape in the cross-sectional view. The second raised portion 1131 may have two surfaces, one of which faces the optical axis of the second lens 11. This surface is a non-working surface, and the image light generally does not shine on this non-working surface. The second draft angle θ2 is the angle between the non-working surface of the second raised portion 1131 and the optical axis of the second lens 11. The other surface of the second raised portion 1131 faces away from the optical axis of the second lens 11. This surface is a working surface, and the image light shines on this working surface. Since the optical focal length of the second light-incoming surface 111 where the second array annular raised portion 113 is located is a positive value, and the second light-incoming surface 111 is in a convex shape, the second draft angle θ2 gradually increases, so that the angle between the working surface and the optical axis gradually increases. The closer the working surface is to the edge of the second lens 11, 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 second raised portion 1131 can receive a wider range of image light, which can increase the transmittance of the entire second lens 11. 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.

[0045] Optionally, the first draft angle θ1 corresponding to each first 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 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 on 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] For each second protrusion portion 1131 on the second lens 11, the corresponding second draft angle θ2 satisfies the condition: 0.95 * the angle between the outgoing light on the working surface of the second protrusion 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 protrusion 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 protrusion portion 1031 or second protrusion portion 1131, the light rays irradiating on the working surface of the protrusion portion are the incident light corresponding to the working surface, and the light rays incident into the interior of the protrusion portion after passing through the working surface are the outgoing light corresponding to the working surface. On the premise that each protrusion 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 protrusion spacing d1 between adjacent first 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 first protrusion 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 protrusion spacing d1. The second protrusion spacing d2 between adjacent second protrusion 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 protrusion 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 protrusion spacing d2. When the protrusion spacing satisfies the above conditions, the protrusion portions in the array annular protrusion portion can be made dense enough with respect to each other to well realize the functions and effects equivalent to those of a Fresnel lens, and the protrusion 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 aspheric surface portion 102 satisfies the condition: 0.1*the aperture of the first light incident surface 101<the aperture of the first aspheric surface portion 102<0.9*the aperture of the first light incident surface 101. Limiting the apertures of the first light incident surface 101 and the first aspheric surface portion 102 can ensure that the size of the first aspheric surface portion 102 is large enough to clearly image the central image of a larger area.

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

[0051] Optionally, the thickness of the first lens 10 at the optical axis satisfies the condition: 4 mm<first lens thickness<20 mm, so that the first lens can be reduced in size and the imaging quality is guaranteed.

[0052] Optionally, the thickness of the second lens at the optical axis of the second lens 11 satisfies the condition: 0.8 mm < thickness of the second lens < 0.9 * thickness of the first lens. This allows the second lens to be small in size and ensures imaging quality. For the first lens 10 and the second lens 11 having both an aspheric portion and an array annular convex portion, when the lens thickness at the optical axis satisfies the above condition, it can save space while having a sufficient optical power, so that light can be focused or defocused.

[0053] 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 first aspheric portion 102 at the optical axis, the size of the first aspheric portion 102 will not be too large, and the first aspheric portion 102 will only focus on the image light of the central field of view, and the first array annular convex portion 103 around the first 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 can also improve the ability to collect image light outside the central field of view.

[0054] Optionally, the relationship between the focal power φ1 of the first lens and the total focal power φ of the lens group satisfies the condition: 0.1<φ1 / φ<0.7; the relationship between the focal power φ2 of the second lens and the total focal power φ of the lens group satisfies the condition: 0.3<φ2 / φ<0.9. Limiting the focal power of the first lens and the second lens can limit the distance range and the focusing range between the two lenses, so that the two lenses can cooperate to achieve a better imaging effect.

[0055] Optionally, the materials of the first lens 10 and the second lens 11 are both optical plastics, and the refractive index of both lenses meets the condition: 1.46<refractive index<1.69; the dispersion coefficient of both lenses meets the condition: 40<dispersion coefficient<69. Limiting the refractive index and dispersion coefficient can ensure that the image light passing through the first lens 10 and the second lens 11 achieves better color accuracy and chromaticity.

[0056] Embodiment 2

[0057] The present invention 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, and the left-eye viewing component and the right-eye viewing component are symmetrically distributed left and right.

[0058] The optical system can also be applied to virtual reality devices or augmented reality devices. The optical system also includes a fixing structure, which is used to fix the two lens groups.

[0059] The optical system also includes a housing, in which the lens group is accommodated.

[0060] Embodiment 3

[0061] The present invention also provides a head-mounted display device, including the aforementioned optical system and a head-mounted component, 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. The head-mounted component includes a glasses frame, the glasses frame includes temples, and the optical system is fixed between the temples. In this embodiment, the temples can be hung on the user's ears, so that the head-mounted display device can be conveniently worn on the user's head, providing the user with virtual reality display or augmented reality display.

[0062] Optionally, the head-mounted display device also includes a camera, with the lens of the camera facing the human eye to perform eye tracking.

[0063] Embodiment 4

[0064] Figure 4 The present invention also provides a display system, which is a virtual reality and / or augmented reality display system. Figure 4As shown, the display system includes a signal input module 13 and the aforementioned head-mounted display device, and the head-mounted display device receives the signal from the signal input module 13 and transmits it 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 display all-in-one machine, and the processing module 4 is also used to control the handle controller.

[0065] In some embodiments, 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 .

[0066] 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.

[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 (cache), etc. 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 run the program instructions to control the handle controller.

[0068] 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.

[0069] Of course, to simplify, Figure 4 Only some of the components related to the present invention in the display system are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, according to specific application conditions, the display system may also include any other appropriate components.

[0070] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0071] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0072] It should also be noted that in the device and apparatus of the present application, each component can be decomposed and / or reassembled, and these decompositions and / or reassemblies should be regarded as equivalent solutions of the present application.

[0073] 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.

[0074] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A lens assembly, characterized in that: It includes two imaging lenses, wherein the lens close to the screen is the first lens, and the lens close to the human eye is the 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 power is a negative value; The surface of the first lens facing the screen is a first light-incoming surface, and the first light-incoming surface includes: a first aspheric surface portion, which is located in the middle of the first lens, wherein the optical axis of the first lens passes through the center of the first aspheric surface portion, and the optical power of the first aspheric surface portion is positive; and A first array annular convex portion includes a plurality of first convex portions arranged in an annular shape, wherein the plurality of first convex portions are sequentially arranged around the first aspherical surface portion; The surface of the second lens facing the human eye is a second light-emitting surface, and the surface shape of the second light-emitting surface is a smooth aspherical surface and the optical power is a negative value; the surface of the second lens facing the screen is a second light-incoming surface, and the second light-incoming surface includes: The second array annular protrusion portion includes a plurality of second protrusions arranged in an annular shape.

2. The lens assembly according to claim 1, characterized in that: The second light incident surface further includes: a second aspheric surface portion, wherein the aperture of the second aspheric surface portion is smaller than 1 / 2 of the aperture of the first aspheric surface portion, and the optical power of the second aspheric surface portion is a positive value; Wherein, a plurality of the second protrusions are sequentially arranged around the second aspherical surface portion.

3. The lens assembly according to claim 1, characterized in that: The included angle between the non-working surface of each first protrusion facing the optical axis of the first lens and the optical axis of the first lens is a first draft angle θ1, and the first draft angle θ1 increases in sequence in a direction away from the optical axis of the first lens; an increase Δθ of the first draft angle θ1 relative to an 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 second protrusion facing the optical axis of the lens and the optical axis of the second lens is a second draft angle θ2, and the second draft angle θ2 increases successively in the direction away from the optical axis of the second lens, and an increase value △θ of each second draft angle θ2 relative to the adjacent draft angle toward the optical axis of the second lens satisfies: 0.01°<△θ<5°.

4. The lens assembly according to claim 3, characterized in that: The first draft angle θ1 satisfies the condition: 0.95*the angle between the outgoing 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 first draft angle θ1<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 condition: 0.95*the angle between the outgoing 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<the second draft angle θ2<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.

5. The lens assembly according to claim 2, characterized in that: The first protrusion pitch d1 between adjacent first protrusion portions on the first light incident surface satisfies the condition: 0.1 mm < d1 < 5 mm, and the height h1 of the first protrusion portion 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 protrusion portions on the second light incident surface satisfies the condition: 0.1 mm < d2 < 5 mm, and the height h2 of the second protrusion portion 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.

6. The lens assembly according to claim 1, characterized in that: 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.

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

8. 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 condition: 4 mm < the thickness of the first lens < 20 mm.

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

10. The lens assembly according to claim 1, characterized in that: 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.

11. 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.

12. The lens assembly according to claim 1, characterized in that: The materials of the first lens and the second lens are both optical plastics, and their refractive indices both satisfy the condition: 1.46 < refractive index < 1.69; their Abbe numbers both satisfy the condition: 40 < Abbe number < 69.

13. An optical system, characterized in that: Comprising: Two lens groups as described in any one of claims 1 to 12, 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 left and right.

14. The optical system according to claim 13, characterized in that Applied to a virtual reality device or an augmented reality device, the system further includes: A fixing structure for fixing the two lens groups.

15. The optical system according to claim 13, characterized in that Further comprising: A housing, and the lens groups are accommodated in the housing.

16. A head mounted display device, characterized in that: Comprising: An optical system as described in any one of claims 13 to 15; And A head-mounted component connected to the optical system, and the head-mounted component is used for wearing on a person's head.

17. The head mounted display device according to claim 16, wherein: Further comprising: A camera, and the lens of the camera faces the human eye.

18. 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 16 or 17, and the head-mounted display device receives the signal from the signal input module and processes the signal.

19. According to the display system described in claim 18, wherein The signal input module includes a handle controller electrically connected to the head-mounted display device.

20. The display system according to claim 19, characterized in that: 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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