Eyepiece lens module and optical system

Abstract

The invention relates to an eyepiece lens module and an optical system. The eyepiece lens module comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are coaxially arranged in sequence from an observation side to a display side; wherein the first lens is a biconvex spherical lens; the second lens is a first cemented lens comprising a first observation side lens assembly and a first display side lens assembly; the observation side surface of the first bonding lens is a concave surface, and the display side surface of the first bonding lens is a convex surface; the third lens is a biconvex spherical lens; any one of the fourth lens and the fifth lens is a biconvex spherical lens, and the other one of the fourth lens and the fifth lens is a second balsaming lens comprising a second observation side lens assembly and a second display side lens assembly; the sixth lens is a biconcave spherical lens. The eyepiece lens module with the structure has the advantages of high definition, strong immersion, small distortion and the like, and the display effect of three-dimensional imaging is better.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an eyepiece lens module and an optical system. Background Art

[0002] With the development of medical technology, minimally invasive surgery has the advantages of small incision, less pain, less bleeding and faster recovery compared to traditional surgery, and its application in the medical field is becoming more and more extensive. With the development of minimally invasive surgery, minimally invasive surgical robots that assist minimally invasive surgery have gradually become essential medical devices in the process of minimally invasive surgery.

[0003] Traditionally, an open 3D screen monitor is used to display 3D surgical images collected by a minimally invasive surgical robot. However, the open 3D screen monitor has the problem of poor 3D display effect. Summary of the invention

[0004] Based on this, it is necessary to provide an eyepiece lens module and an optical system that can improve the display effect of 3D images in order to solve the above technical problems.

[0005] In a first aspect, the present application provides an eyepiece lens module. The eyepiece lens module comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens coaxially arranged in sequence from an observation side to a display side;

[0006] The first lens is a biconvex spherical lens;

[0007] The second lens is a first cemented lens including a first observation side lens assembly and a first display side lens assembly; the observation side surface of the first cemented lens is a concave surface, and the display side surface of the first cemented lens is a convex surface;

[0008] The third lens is a biconvex spherical lens;

[0009] Any one of the fourth lens and the fifth lens is a biconvex spherical lens, and the other of the fourth lens and the fifth lens is a second cemented lens including a second observation side lens assembly and a second display side lens assembly;

[0010] The sixth lens is a biconcave spherical lens.

[0011] In one embodiment, the first observation side lens component is a biconcave spherical lens, and the first display side lens component is a biconvex spherical lens;

[0012] The second observation side lens assembly is a double convex spherical lens, and the second display side lens assembly is a double concave spherical lens.

[0013] In one embodiment, the image-side focal length f1 of the first lens satisfies The curvature radius R1 of the observation side surface of the first lens and the curvature radius R2 of the display side surface of the first lens satisfy

[0014] The refractive index of the first lens is n 1d Meet 1.55 <n 1d <1.75, Abbe number V of the first lens 1d Meet 45 <V 1d <65;

[0015] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0016] In one embodiment, the image-side focal length f2 of the first viewing-side lens assembly satisfies The curvature radius R3 of the observation side surface of the first observation side lens assembly and the curvature radius R4 of the display side surface of the first observation side lens assembly satisfy

[0017] The refractive index of the first viewing side lens component d is n 2d Meet 1.55 <n 2d <1.75, Abbe number V of d-light of the first observation side lens assembly 2d Meet 30 <V 2d <45; the distance d between the first lens and the first observation side lens assembly 12 satisfy

[0018] The image-side focal length f3 of the first display-side lens assembly satisfies The curvature radius R4 of the observation side surface of the first display side lens assembly and the curvature radius R5 of the display side surface of the first display side lens assembly satisfy

[0019] The refractive index of the first display side lens component d is n 3d Meet 1.55 <n 3d <1.75, d-light Abbe number V of the first display-side lens assembly 3d Meet 55 <V 3d <75;

[0020] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0021] In one embodiment, the image-side focal length f4 of the third lens satisfies The curvature radius R6 of the observation side surface of the third lens and the curvature radius R7 of the display side surface of the third lens satisfy

[0022] The refractive index of the third lens d light n 4dMeet 1.55 <n 4d <1.75, Abbe number V of the d-light of the third lens 4d Meet 55 <V 4d <75; the distance d between the first display side lens assembly and the third lens 34 satisfy

[0023] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0024] In one embodiment, the fourth lens is a biconvex spherical lens, and the image side focal length f5 of the fourth lens satisfies The curvature radius R8 of the observation side surface of the fourth lens and the curvature radius R9 of the display side surface of the fourth lens satisfy

[0025] The refractive index of the fourth lens d-light n 5d Satisfies 1.6 <n 5d <1.7, the d-light Abbe number V of the fourth lens 5d Meet 40 <V 5d <60; the distance d between the third lens and the fourth lens 45 satisfy

[0026] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0027] In one embodiment, the fifth lens is a second cemented lens, and the image-side focal length f6 of the second observation-side lens assembly satisfies The radius of curvature R of the observation side surface of the second observation side lens assembly 10 and the curvature radius R of the display side surface of the second viewing side lens assembly 11 satisfy

[0028] The refractive index of the second viewing side lens component d is n 6d Meet 1.55 <n 6d <1.65, Abbe number V of d-light of the second observation side lens assembly 6d Meet 60 <V 6d <70; the distance d between the fourth lens and the second observation side lens assembly 56 satisfy

[0029] The image-side focal length f7 of the second display-side lens assembly satisfies The curvature radius R of the observation side surface of the second display side lens assembly 11 and the curvature radius R of the display side surface of the second display side lens assembly 12 satisfy

[0030] The refractive index of the second display side lens component d is n 7d Meets 1.65 <n 7d <1.85, Abbe number V of d-light of the second display side lens assembly 7d Meet 25 <V 7d <35;

[0031] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0032] In one embodiment, the image-side focal length f8 of the sixth lens element satisfies The curvature radius R of the observation side surface of the sixth lens 13 and the curvature radius R of the display side surface of the sixth lens 14 satisfy

[0033] The refractive index of the sixth lens d-light n 8d Meets 1.65 <n 8d <1.85, Abbe number V of the sixth lens in d-light 8d Meet 20 <V 8d <35; the distance d between the second display side lens assembly and the sixth lens 78 satisfy

[0034] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0035] In one embodiment, the image-side focal length f1 of the first lens satisfies The curvature radius R1 of the observation side surface of the first lens and the curvature radius R2 of the display side surface of the first lens satisfy

[0036] The refractive index of the first lens is n 1d Meet 1.55 <n 1d <1.7, Abbe number V of the first lens 1d Meet 50 <V 1d <70;

[0037] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0038] In one embodiment, the image-side focal length f2 of the first viewing-side lens assembly satisfies The curvature radius R3 of the observation side surface of the first observation side lens assembly and the curvature radius R4 of the display side surface of the first observation side lens assembly satisfy

[0039] The refractive index of the first viewing side lens component d is n2d Satisfy 1.5 <n 2d <1.7, Abbe number V of d-light of the first observation side lens assembly 2d Meet 30 <V 2d <50; the distance d between the first lens and the first observation side lens assembly 12 satisfy

[0040] The image-side focal length f3 of the first display-side lens assembly satisfies The curvature radius R4 of the observation side surface of the first display side lens assembly and the curvature radius R5 of the display side surface of the first display side lens assembly satisfy

[0041] The refractive index of the first display side lens component d is n 3d Satisfies 1.4 <n 3d <1.6, Abbe number V of d-light of the first display-side lens assembly 3d Meet 70 <V 3d <90;

[0042] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0043] In one embodiment, the image-side focal length f4 of the third lens satisfies The curvature radius R6 of the observation side surface of the third lens and the curvature radius R7 of the display side surface of the third lens satisfy

[0044] The refractive index of the third lens d light n 4d Satisfy 1.5 <n 4d <1.7, Abbe number V of d-light of the third lens 4d Meet 55 <V 4d <75; the distance d between the first display side lens assembly and the third lens 34 satisfy

[0045] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0046] In one embodiment, the fourth lens is a second cemented lens, and the image side focal length f5 of the second observation side lens assembly satisfies The curvature radius R8 of the observation side surface of the second observation side lens assembly and the curvature radius R9 of the display side surface of the second observation side lens assembly meet

[0047] The refractive index of the second viewing side lens component d is n 5d Satisfy 1.5 <n 5d<1.7, Abbe number V of d-light of the second observation side lens assembly 5d Meet 45 <V 5d <65; the distance d between the third lens and the second observation side lens assembly 45 satisfy

[0048] The image-side focal length f6 of the second display-side lens assembly satisfies The curvature radius R9 of the observation side surface of the second display side lens assembly and the curvature radius R of the display side surface of the second display side lens assembly 10 satisfy

[0049] The refractive index of the second display side lens component d is n 6d Satisfy 1.5 <n 6d <1.7, Abbe number V of d-light of the second display side lens assembly 6d Meet 25 <V 6d <45;

[0050] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0051] In one embodiment, the fifth lens is a biconvex spherical lens, and the image-side focal length f7 of the fifth lens satisfies The curvature radius R of the observation side surface of the fifth lens 11 and the curvature radius R of the display side surface of the fifth lens 12 satisfy

[0052] The refractive index of the fifth lens d light n 7d Meets 1.65 <n 7d <1.85, the d-light Abbe number V of the fifth lens 7d Meet 45 <V 7d <65; the distance d between the second display side lens assembly and the fifth lens 67 satisfy

[0053] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0054] In one embodiment, the image-side focal length f8 of the sixth lens element satisfies The curvature radius R of the observation side surface of the sixth lens 13 and the curvature radius R of the display side surface of the sixth lens 14 satisfy

[0055] The refractive index of the sixth lens d-light n 8d Meets 1.65 <n 8d<1.85, Abbe number V of the sixth lens in d-light 8d Meet 15 <V 8d <35; the distance d between the fifth lens and the sixth lens 78 satisfy

[0056] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0057] In one embodiment, the eyepiece lens module further includes a seventh lens, which is disposed between the second lens and the third lens;

[0058] The seventh lens is a meniscus lens.

[0059] In one embodiment, the first observation side lens assembly is a meniscus lens; the first display side lens assembly is a meniscus moon lens;

[0060] The second observation side lens assembly is a biconcave spherical lens, and the second display side lens assembly is a meniscus lens.

[0061] In one embodiment, the image-side focal length f1 of the first lens satisfies The curvature radius R1 of the observation side surface of the first lens and the curvature radius R2 of the display side surface of the first lens satisfy

[0062] The refractive index of the first lens is n 1d Meets 1.5 <n 1d <1.7, Abbe number V of the first lens 1d Meet 50 <V 1d <70;

[0063] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0064] In one embodiment, the image-side focal length f2 of the first viewing-side lens assembly satisfies The curvature radius R3 of the observation side surface of the first observation side lens assembly and the curvature radius R4 of the display side surface of the first observation side lens assembly satisfy

[0065] The refractive index of the first viewing side lens component d is n 2d Meets 1.5 <n 2d <1.7, Abbe number V of d-light of the first observation side lens assembly 2d Meet 30 <V 2d <50; the distance d between the first lens and the first observation side lens assembly 12 satisfy

[0066] The image-side focal length f3 of the first display-side lens assembly satisfies The curvature radius R4 of the observation side surface of the first display side lens assembly and the curvature radius R5 of the display side surface of the first display side lens assembly satisfy

[0067] The refractive index of the first display side lens component d is n 3d Satisfies 1.4 <n 3d <1.6, Abbe number V of d-light of the first display-side lens assembly 3d Meet 70 <V 3d <90;

[0068] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0069] In one embodiment, the image-side focal length f4 of the seventh lens element satisfies The curvature radius R6 of the observation side surface of the seventh lens and the curvature radius R7 of the display side surface of the seventh lens satisfy

[0070] The refractive index of the seventh lens d light n 4d Satisfy 1.5 <n 4d <1.7, Abbe number V of d-light of the seventh lens 4d Meet 55 <V 4d <75; the distance d between the first display side lens assembly and the seventh lens 34 satisfy

[0071] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0072] In one embodiment, the image-side focal length f5 of the third lens element satisfies The curvature radius R8 of the observation side surface of the third lens and the curvature radius R9 of the display side surface of the third lens satisfy

[0073] The refractive index of the third lens d light n 5d Satisfies 1.6 <n 5d <1.8, Abbe number V of d-light of the third lens 5d Meet 45 <V 5d <65;

[0074] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0075] In one embodiment, the fourth lens is a biconvex spherical lens, and the image side focal length f6 of the fourth lens satisfies The curvature radius R of the observation side surface of the fourth lens 10 and the curvature radius R of the display side surface of the fourth lens11 satisfy

[0076] The refractive index of the fourth lens d-light n 6d Satisfy 1.5 <n 5d <1.7, the d-light Abbe number V of the fourth lens 6d Meet 50 <V 5d <70;

[0077] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0078] In one embodiment, the fifth lens is a second cemented lens, and the image side focal length f7 of the second observation side lens assembly satisfies The radius of curvature R of the observation side surface of the second observation side lens assembly 12 and the curvature radius R of the display side surface of the second viewing side lens assembly 13 satisfy

[0079] The refractive index of the second viewing side lens component d is n 7d Meets 1.7 <n 7d <1.9, Abbe number V of d-light of the second observation side lens assembly 7d Meet 15 <V 7d <35; the distance d between the fourth lens and the second observation side lens assembly 67 satisfy

[0080] The image-side focal length f8 of the second display-side lens assembly satisfies The curvature radius R of the observation side surface of the second display side lens assembly 13 and the curvature radius R of the display side surface of the second display side lens assembly 14 satisfy

[0081] The refractive index of the second display side lens component d is n 8d Meets 1.65 <n 8d <1.85, Abbe number V of d-light of the second display side lens assembly 8d Meet 25 <V 6d <45;

[0082] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0083] In one embodiment, the image-side focal length f9 of the sixth lens element satisfies The curvature radius R of the observation side surface of the sixth lens 15 and the curvature radius R of the display side surface of the sixth lens 16 satisfy

[0084] The refractive index of the sixth lens d-light n 9d Meets 1.7 <n 9d <1.9, Abbe number V of the sixth lens in d-light 9d Meet 30 <V 9d <50; the distance d between the second display side lens assembly and the sixth lens 89 satisfy

[0085] Among them, EFFL is the effective focal length of the eyepiece lens module.

[0086] In a second aspect, the present application further provides an optical system. The optical system comprises: a display screen and the eyepiece lens module in the first aspect; the display screen is arranged on the display side of the eyepiece lens module;

[0087] a display screen for emitting outgoing light;

[0088] The eyepiece lens module is used to receive the output light of the display screen and transmit the output light to the human eye to form a virtual image perceived by the human eye.

[0089] In one embodiment, the focal length of the optical system is greater than or equal to 35 mm, the exit pupil distance is greater than or equal to 20 mm, the exit pupil diameter is greater than or equal to 8 mm, and the full field of view angle is greater than or equal to 45°.

[0090] The above-mentioned eyepiece lens module and optical system, wherein the eyepiece lens module includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens coaxially arranged in sequence from the observation side to the display side; wherein the first lens is a biconvex spherical lens; the second lens is a first cemented lens including a first observation side lens assembly and a first display side lens assembly; the observation side surface of the first cemented lens is concave, and the display side surface of the first cemented lens is convex; the third lens is a biconvex spherical lens; any one of the fourth lens and the fifth lens is a biconvex spherical lens, and the other of the fourth lens and the fifth lens is a second cemented lens including a second observation side lens assembly and a second display side lens assembly; the sixth lens is a biconcave spherical lens. The eyepiece lens module of this structure has the characteristics of high clarity, strong immersion, small distortion, etc. When the eyepiece lens module is used for three-dimensional imaging, a higher full field of view angle and exit pupil distance can be provided, which not only does not affect the use of people wearing glasses, but also improves the display effect of three-dimensional images. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] Figure 1 A schematic diagram of the structure of an eyepiece lens module provided in an embodiment of the present application;

[0092] Figure 2Another structural schematic diagram of the eyepiece lens module provided in an embodiment of the present application;

[0093] Figure 3 for Figure 2 MTF curve diagram of the eyepiece lens module shown;

[0094] Figure 4 for Figure 2 A graph showing the field curvature and distortion of the eyepiece lens module as the field of view increases;

[0095] Figure 5 Another structural schematic diagram of the eyepiece lens module provided in an embodiment of the present application;

[0096] Figure 6 for Figure 5 MTF curve diagram of the eyepiece lens module shown;

[0097] Figure 7 for Figure 5 A graph showing the field curvature and distortion of the eyepiece lens module as the field of view increases;

[0098] Figure 8 Another structural schematic diagram of the eyepiece lens module provided in an embodiment of the present application;

[0099] Fig. 9 for Figure 8 MTF curve diagram of the eyepiece lens module shown;

[0100] Fig.10 for Figure 8 A graph showing the field curvature and distortion of the eyepiece lens module as the field of view increases. DETAILED DESCRIPTION

[0101] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0102] The eyepiece lens module provided in the embodiment of the present application is suitable for the field of 3D display technology, including but not limited to 3D glasses, virtual reality (VR) glasses, augmented reality (AR) glasses, 3D microscopes and other three-dimensional optical eyepieces.

[0103] For example, with the development of medical technology, minimally invasive surgical robots, as a medical device that uses advanced technology to perform surgery, have become an important part of the modern medical field. Traditionally, when performing minimally invasive surgery with a minimally invasive surgical robot, the doctor uses the 3D intraoperative image displayed on an open 3D screen monitor to operate the minimally invasive surgical robot to perform minimally invasive surgery.

[0104] However, with the development of medical technology, traditional open 3D display technology is increasingly unable to meet the needs of doctors; for example: traditional 3D displays can only provide limited stereoscopic perception and cannot provide a truly immersive experience. The image quality displayed by the resolution of traditional 3D displays is limited, and traditional 3D displays can only provide limited viewing angles. Users must maintain a certain distance and focal length to obtain the best stereoscopic effect. In general, the use of open 3D screen monitors for display has the problem of poor 3D display effects.

[0105] With the development of VR technology, the application of VR technology in the field of minimally invasive surgical robots has also attracted more and more attention. The use of VR technology can provide doctors with a more realistic and immersive surgical environment, thereby improving doctors' surgical skills and accuracy and reducing surgical risks and complications. In order to apply VR technology to the field of surgical robots, VR optical eyepieces are a key component to achieve this goal. VR eyepieces have better immersion in optics and can completely surround the user's visual range, thereby providing a more realistic and immersive surgical environment; in minimally invasive surgical robots, VR eyepieces can be used to display surgical areas and surgical instruments so that doctors can operate surgical robots more accurately. In addition, VR eyepieces can also add components that can track the user's head movement to provide a better spatial experience perception. VR eyepieces can also be equipped with a micro high-resolution display for each eye to provide higher resolution. In addition, VR eyepieces can also be used to train doctors, allowing doctors to practice in a simulated surgical environment.

[0106] Based on the above analysis, this application proposes a VR eyepiece with high definition, large field of view and small distortion, which provides a more efficient and safe surgical plan for minimally invasive surgical robots, provides a better surgical experience and effect, and improves the surgical success rate and patient survival rate.

[0107] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0108] Figure 1 This is a schematic diagram of the structure of the eyepiece lens module provided in the embodiment of the present application. Figure 1 As shown, the eyepiece lens module 100 includes: a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50 and a sixth lens 60 which are coaxially arranged in sequence from the observation side to the display side.

[0109] The observation side is the side where the eyepiece lens module 100 is close to the human eye (eg Figure 1 The display side is the side of the eyepiece lens module 100 away from the human eye, that is, close to the display screen (such as Figure 1 The display screen 102 is used to output and display a three-dimensional image. The light of the three-dimensional image displayed on the display screen 102 passes through the eyepiece lens module 100 and then irradiates the exit pupil surface 101 at the human eye, thereby forming a three-dimensional virtual image perceived by the human eye.

[0110] Exemplarily, the first lens 10 can be a biconvex spherical lens; the second lens 20 can be a first cemented lens including a first observation side lens assembly and a first display side lens assembly; and the observation side surface of the first cemented lens is concave, and the display side surface of the first cemented lens is convex; that is, the second lens 20 is a combined lens formed by gluing two lens assemblies, and the combined lens is called a first cemented lens; wherein, the lens assembly on the side close to the human eye in the first cemented lens can be called a first observation side lens assembly, and the lens assembly on the side close to the display screen can be called a first display side lens assembly.

[0111] In addition, since the first observation side lens assembly and the first display side lens assembly are glued together, the first observation side lens assembly originally includes a first surface on the side close to the human eye and a second surface on the side away from the human eye, and the first display side lens assembly includes a third surface on the side close to the human eye and a fourth surface on the side away from the human eye; then, after the first observation side lens assembly and the first display side lens assembly are glued together, the second surface of the first observation side lens assembly coincides with the third surface of the first display side lens assembly, so that the first glued lens after gluing, that is, the second lens 20 may include the first surface of the first observation side lens assembly close to the human eye, the fourth surface of the first display side lens assembly away from the human eye, and the glued surface (such as Figure 2 For example, for the three surfaces of the second lens 20 (i.e., the first cemented lens), the first surface of the first observation-side lens assembly close to the human eye can be referred to as the observation-side surface of the second lens 20 (i.e., the first cemented lens), and the fourth surface of the first display-side lens assembly away from the human eye can be referred to as the display-side surface of the second lens 20 (i.e., the first cemented lens).

[0112] Among them, the observation side surface of the second lens 20 (that is, the first cemented lens) is a concave surface, and the display side surface of the second lens 20 (that is, the first cemented lens) is a convex surface; optionally, the middle cemented surface of the second lens 20 (that is, the first cemented lens) can be a plane, and the middle cemented surface can also be close to the observation side surface of the second lens 20, or close to the display side surface of the second lens 20; in the embodiment of the present application, the shape of the middle cemented surface of the second lens 20 is not specifically limited.

[0113] For example, reference Figure 1 As shown, when the middle bonding surface of the second lens 20 (also known as the first bonding lens) is close to the observation side surface of the second lens 20, the first observation side lens assembly is a double concave spherical lens, and the first display side lens assembly is a double convex spherical lens; when the middle bonding surface of the second lens 20 (also known as the first bonding lens) is a plane, the first observation side lens assembly can be a meniscus lens, and the first display side lens assembly is a meniscus moon lens.

[0114] Exemplarily, the third lens 30 of the eyepiece lens module 100 may be a biconvex spherical lens; any one of the fourth lens 40 and the fifth lens 50 is a biconvex spherical lens, and the other of the fourth lens 40 and the fifth lens 50 is a second cemented lens including a second observation side lens assembly and a second display side lens assembly. That is, in one case, referring to Figure 1 As shown, the fourth lens 40 can be a biconvex spherical lens, and the fifth lens 50 can be a combined lens, that is, a second cemented lens; or, in another case, the fourth lens 40 can also be a combined lens, that is, a second cemented lens, and the fifth lens 50 can be a biconvex spherical lens. In addition, the sixth lens 60 can be a biconcave spherical lens.

[0115] Exemplarily, for the second cemented lens, referring to the above-mentioned first cemented lens, the second cemented lens may also include three surfaces, namely, the observation side surface of the second cemented lens, the middle cemented lens of the second cemented lens and the display side surface of the second cemented lens; the three surfaces of the second cemented lens may be concave or convex, respectively; in addition, the surface morphologies of the two side surfaces of the second cemented lens, namely, the observation side surface and the display side surface of the second cemented lens may be the same or different; for example, they may both be concave, or both be convex, or one of them may be concave and the other may be convex, etc.; the embodiments of the present application do not make specific limitations on this.

[0116] For each lens in the above-mentioned eyepiece lens module, it can be made of glass lenses, resin lenses, PC lenses and other materials, and the embodiments of the present application do not make specific limitations on this.

[0117] Refer to the above Figure 1As shown, when the above-mentioned eyepiece lens module is used for three-dimensional imaging, the light emitted by the display screen 102 passes through the sixth lens 60, the fifth lens 50, the fourth lens 40, the third lens 30, the second lens 20, and the first lens 10 in sequence and reaches the exit pupil surface 101 at the human eye, thereby forming a three-dimensional virtual image perceived by the human eye.

[0118] The eyepiece lens module provided in the embodiment of the present application has the advantage of high definition, and its central field of view MTF value can reach more than 0.7 at 70lp / mm, and the edge field of view MTF value can reach 0.2 at 70lp / mm, and can be matched with a 1.03-inch 2K resolution display screen. Among them, the MTF value (Modulation transfer function) is a numerical value for comprehensively evaluating the sharpness, contrast and resolution of the lens. In addition, the eyepiece lens module can have an exit pupil distance of about 20mm, which does not affect the use of people wearing glasses. Furthermore, the full field of view angle of the eyepiece lens module can reach about 45°, with a strong sense of immersion and small distortion, with a maximum of no more than 5%.

[0119] The eyepiece lens module provided in this embodiment includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens coaxially arranged in sequence from the observation side to the display side; wherein the first lens is a biconvex spherical lens; the second lens is a first cemented lens including a first observation side lens assembly and a first display side lens assembly; the observation side surface of the first cemented lens is concave, and the display side surface of the first cemented lens is convex; the third lens is a biconvex spherical lens; any one of the fourth lens and the fifth lens is a biconvex spherical lens, and the other of the fourth lens and the fifth lens is a second cemented lens including a second observation side lens assembly and a second display side lens assembly; the sixth lens is a biconcave spherical lens. The eyepiece lens module of this structure has the characteristics of high clarity, strong immersion, and small distortion. When the eyepiece lens module is used for three-dimensional imaging, a higher full field of view angle and exit pupil distance can be provided, which not only does not affect the use of people wearing glasses, but also improves the display effect of three-dimensional images.

[0120] In one embodiment, an eyepiece lens module is provided, in which the first observation side lens assembly can be a biconcave spherical lens, and the first display side lens assembly can be a biconvex spherical lens; the second observation side lens assembly can be a biconvex spherical lens, and the second display side lens assembly can be a biconcave spherical lens.

[0121] Based on the eyepiece lens module structure, two eyepiece lens modules with different parameter ranges are provided below.

[0122] The first one: reference Figure 2 The eyepiece lens module structure shown.

[0123] The eyepiece lens module in this embodiment includes 8 spherical lenses, with an effective focal length of up to 35mm, an exit pupil distance of up to 20mm, a full field of view angle of up to 45°, an exit pupil diameter of up to 8mm, an operating wavelength between 0.46um-0.66um, an object height of up to 13.3mm, and can be adapted to a 1.03-inch micro display screen.

[0124] Exemplarily, the first lens 10 is a biconvex spherical lens, and the image-side focal length f1 of the first lens 10 satisfies The curvature radius R1 of the observation side surface S1 of the first lens 10 and the curvature radius R2 of the display side surface S2 of the first lens 10 satisfy The refractive index n of the first lens 10 is 1d Meet 1.55 <n 1d <1.75, the d-light Abbe number V of the first lens 10 1d Meet 45 <V 1d <65; EFFL is the effective focal length of the eyepiece lens module. D-light is a light wave with a wavelength of 589.3nm. The wavelength to which the human eye is most sensitive is 555nm, and D-light is a light wave that is closer to this wavelength.

[0125] Exemplarily, the second lens 20 is a first cemented lens, including a first observation side lens assembly 201 and a first display side lens assembly 202; wherein the first observation side lens assembly 201 is a biconcave spherical lens, and the image side focal length f2 of the first observation side lens assembly 201 satisfies The curvature radius R3 of the observation side surface S3 of the first observation side lens assembly 201 and the curvature radius R4 of the display side surface S4 of the first observation side lens assembly 201 satisfy The refractive index n of the first viewing side lens assembly 201 is 2d Meet 1.55 <n 2d <1.75, d-light Abbe number V of the first observation side lens assembly 201 2d Meet 30 <V 2d <45; the distance d between the first lens 10 and the first observation side lens assembly 201 12 satisfy The first display side lens assembly 202 is a biconvex spherical lens, and the image side focal length f3 of the first display side lens assembly 202 satisfies The curvature radius R4 of the observation side surface S4 of the first display side lens assembly 202 and the curvature radius R5 of the display side surface S5 of the first display side lens assembly 202 satisfy The refractive index n of the first display-side lens assembly 202 is 3d Meet 1.55 <n 3d <1.75, the d-light Abbe number V of the first display-side lens assembly 202 3dMeet 55 <V 3d <75; where EFFL is the effective focal length of the eyepiece lens module.

[0126] Exemplarily, the third lens 30 is a biconvex spherical lens; the image-side focal length f4 of the third lens 30 satisfies The curvature radius R6 of the observation-side surface S6 of the third lens 30 and the curvature radius R7 of the display-side surface S7 of the third lens 30 satisfy The refractive index of the third lens 30 is n 4d Meet 1.55 <n 4d <1.75, the d-light Abbe number V of the third lens 30 4d Meet 55 <V 4d <75; the distance d between the first display side lens assembly and the third lens 30 34 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

[0127] Exemplarily, the fourth lens 40 is a biconvex spherical lens, and the image-side focal length f5 of the fourth lens 40 satisfies The curvature radius R8 of the observation side surface S8 of the fourth lens 40 and the curvature radius R9 of the display side surface S9 of the fourth lens 40 satisfy The refractive index of the d-light of the fourth lens 40 is n 5d Satisfies 1.6 <n 5d <1.7, the d-light Abbe number V of the fourth lens element 40 5d Meet 40 <V 5d <60; the distance d between the third lens 30 and the fourth lens 40 45 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

[0128] Exemplarily, the fifth lens 50 is a second cemented lens, including a second observation side lens assembly 501 and a second observation side lens assembly 502; wherein the second observation side lens assembly 501 is a biconvex spherical lens, and the image side focal length f6 of the second observation side lens assembly 501 satisfies The curvature radius R of the observation side surface S10 of the second observation side lens assembly 501 is 10 and the curvature radius R of the display side surface S11 of the second viewing side lens assembly 501 11 satisfy The refractive index of the second viewing side lens assembly 501 is n 6d Meet 1.55 <n 6d <1.65, d-light Abbe number V of the second observation side lens assembly 501 6d Meet 60 <V 6d<70; the distance d between the fourth lens 40 and the second observation side lens assembly 501 56 satisfy The second display side lens assembly 502 is a biconcave spherical lens, and the image side focal length f7 of the second display side lens assembly 502 satisfies The curvature radius R of the observation side surface S11 of the second display side lens assembly 502 11 and the curvature radius R of the display side surface S12 of the second display side lens assembly 502 12 satisfy The refractive index n of the second display-side lens assembly 502 is 7d Meets 1.65 <n 7d <1.85, the d-light Abbe number V of the second display-side lens assembly 502 7d Meet 25 <V 7d <35; where EFFL is the effective focal length of the eyepiece lens module.

[0129] Exemplarily, the sixth lens 60 is a biconcave spherical lens, and the image-side focal length f8 of the sixth lens 60 satisfies The curvature radius R of the observation side surface S13 of the sixth lens 60 is 13 and the curvature radius R of the display side surface S14 of the sixth lens 60 14 satisfy The refractive index of the sixth lens 60 for d light is n 8d Meets 1.65 <n 8d <1.85, the d-light Abbe number V of the sixth lens element 60 8d Meet 20 <V 8d <35; the distance d between the second display side lens assembly and the sixth lens 60 78 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

[0130] Exemplarily, the specific surface parameters of each lens of the above-mentioned eyepiece lens module are shown in Table 1.

[0131] Table 1

[0132]

[0133] Among them, the surface serial number represents the serial numbers of the exit pupil surface, each lens and each surface of the display screen arranged in sequence along the direction from the exit pupil surface to the display screen; the marking represents the marking serial number of each surface of each lens arranged in sequence along the direction from the exit pupil surface to the display screen; it should be noted that for the cemented lens, it includes three surfaces, namely the observation side surface, the cemented surface and the display side surface; for the non-cemented lens, it includes two surfaces, namely the observation side surface and the display side surface.

[0134] refer to Figure 3 As shown, it shows Figure 2 The modulation transfer function (MTF) curve of the eyepiece lens module shown in the figure includes the meridian sagittal MTF curves of 0 field of view, 9° field of view, 18° field of view and 22.5° field of view; the solid line represents the meridian MTF curve, the dotted line represents the sagittal MTF curve, and different colors represent different fields of view. The MTF value of the edge field of view is 0.2 at 70lp / mm, which meets the imaging requirements of the display screen with a minimum pixel size of 7.2um.

[0135] refer to Figure 4 As shown, it shows Figure 2 The curve diagram of the field curvature and distortion of the eyepiece lens module as the field of view increases is shown; the solid line represents the field curvature change curve in the meridian plane, the dotted line represents the field curvature change curve in the sagittal plane, and the curves of different colors represent the field curvature and distortion curves of different wavelengths. The sagittal field curvature is 0.0602mm, the meridian field curvature is 0.041mm, and the distortion is the maximum value of 5% at the edge of the field of view.

[0136] The second type: reference Figure 5 The eyepiece lens module structure shown.

[0137] The eyepiece lens module in this embodiment includes 8 spherical lenses, with an effective focal length of up to 35 mm, an exit pupil distance of up to 20 mm, a full field of view angle of up to 45°, and an exit pupil diameter of up to 8 mm.

[0138] Exemplarily, the first lens 10 is a biconvex spherical lens, and the image-side focal length f1 of the first lens 10 satisfies The curvature radius R1 of the observation side surface S1 of the first lens 10 and the curvature radius R2 of the display side surface S2 of the first lens 10 satisfy The refractive index n of the first lens 10 is 1d Meet 1.55 <n 1d <1.7, the d-light Abbe number V of the first lens 10 1d Meet 50 <V 1d <70; where EFFL is the effective focal length of the eyepiece lens module.

[0139] Exemplarily, the second lens 20 is a first cemented lens, including a first observation side lens assembly 201 and a first display side lens assembly 202; wherein the first observation side lens assembly 201 is a biconcave spherical lens, and the image side focal length f2 of the first observation side lens assembly 201 satisfies The curvature radius R3 of the observation side surface S3 of the first observation side lens assembly 201 and the curvature radius R4 of the display side surface S4 of the first observation side lens assembly 201 satisfy The refractive index n of the first viewing side lens assembly 201 is 2d Satisfy 1.5 <n 2d <1.7, d-light Abbe number V of the first observation side lens assembly 201 2d Meet 30 <V 2d <50; the distance d between the first lens 10 and the first observation side lens assembly 201 12 satisfy The first display side lens assembly 202 is a biconvex spherical lens, and the image side focal length f3 of the first display side lens assembly 202 satisfies The curvature radius R4 of the observation side surface S4 of the first display side lens assembly 202 and the curvature radius R5 of the display side surface S5 of the first display side lens assembly 202 satisfy The refractive index n of the first display-side lens assembly 202 is 3d Satisfies 1.4 <n 3d <1.6, the d-light Abbe number V of the first display-side lens assembly 202 3d Meet 70 <V 3d <90; where EFFL is the effective focal length of the eyepiece lens module.

[0140] Exemplarily, the third lens 30 is a biconvex spherical lens, and the image-side focal length f4 of the third lens 30 satisfies The curvature radius R6 of the observation-side surface S6 of the third lens 30 and the curvature radius R7 of the display-side surface S7 of the third lens 30 satisfy The refractive index of the third lens 30 is n 4d Satisfy 1.5 <n 4d <1.7, the d-light Abbe number V of the third lens 30 4d Meet 55 <V 4d <75; the distance d between the first display side lens assembly and the third lens 30 34 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

[0141] Exemplarily, the fourth lens 40 is a second cemented lens, including a second observation side lens assembly 401 and a second observation side lens assembly 402; wherein the second observation side lens assembly 401 is a biconvex spherical lens, and the image side focal length f5 of the second observation side lens assembly 401 satisfies The curvature radius R8 of the observation side surface S8 of the second observation side lens assembly 401 and the curvature radius R9 of the display side surface S9 of the second observation side lens assembly 401 satisfy The refractive index of the second viewing side lens assembly 401 is n 5d Satisfy 1.5 <n 5d <1.7, d-light Abbe number V of the second observation side lens assembly 4015d Meet 45 <V 5d <65; the distance d between the third lens 30 and the second observation side lens assembly 401 45 satisfy The second display side lens assembly 402 is a biconcave spherical lens, and the image side focal length f6 of the second display side lens assembly 402 satisfies The curvature radius R9 of the observation side surface S9 of the second display side lens assembly 402 and the curvature radius R of the display side surface S10 of the second display side lens assembly 402 are 10 satisfy The refractive index n of the second display-side lens assembly 402 is 6d Satisfy 1.5 <n 6d <1.7, the d-light Abbe number V of the second display-side lens assembly 402 6d Meet 25 <V 6d <45; where EFFL is the effective focal length of the eyepiece lens module.

[0142] Exemplarily, the fifth lens 50 is a biconvex spherical lens, and the image-side focal length f7 of the fifth lens 50 satisfies The curvature radius R of the observation side surface S11 of the fifth lens 50 is 11 and the curvature radius R of the display side surface S12 of the fifth lens 50 12 satisfy The refractive index n of the d-light of the fifth lens 50 is 7d Meets 1.65 <n 7d <1.85, the d-light Abbe number V of the fifth lens element 50 7d Meet 45 <V 7d <65; the distance d between the second display side lens assembly and the fifth lens 50 67 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

[0143] Exemplarily, the sixth lens 60 is a biconcave spherical lens, and the image-side focal length f8 of the sixth lens 60 satisfies The curvature radius R of the observation side surface S13 of the sixth lens 60 is 13 and the curvature radius R of the display side surface S14 of the sixth lens 60 14 satisfy The refractive index of the sixth lens 60 for d light is n 8d Meets 1.65 <n 8d <1.85, the d-light Abbe number V of the sixth lens element 60 8d Meet 15 <V 8d <35; the distance d between the fifth lens 50 and the sixth lens 60 78 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

[0144] Exemplarily, the specific surface parameters of each lens of the above-mentioned eyepiece lens module are shown in Table 2.

[0145] Table 2

[0146]

[0147] Among them, the surface serial number represents the serial number of each surface of the image plane, aperture, each lens and object plane arranged in sequence along the direction from the image plane to the object plane; the marking represents the marking serial number of each surface of each lens arranged in sequence along the direction from the image plane to the object plane; it should be noted that for the cemented lens, it includes three surfaces, namely the observation side surface, the cemented surface and the display side surface; for the non-cemented lens, it includes two surfaces, namely the observation side surface and the display side surface.

[0148] refer to Figure 6 As shown, it shows Figure 5 The modulation transfer function (MTF) curve of the eyepiece lens module shown in the figure includes the meridian sagittal MTF curves of 0 field of view, 9° field of view, 18° field of view and 22.5° field of view; the solid line represents the meridian MTF curve, the dotted line represents the sagittal MTF curve, and different colors represent different fields of view. The MTF value of the edge field of view is 0.2 at 70lp / mm, which meets the imaging requirements of the display screen with a minimum pixel size of 7.2um.

[0149] refer to Figure 7 As shown, it shows Figure 5 The curves of the field curvature and distortion of the eyepiece lens module as the field of view increases are shown. The solid line represents the field curvature change curve in the meridian plane, the dotted line represents the field curvature change curve in the sagittal plane, and the curves of different colors represent the field curvature and distortion curves of different wavelengths. The sagittal field curvature is 0.0558mm, the meridian field curvature is 0.0374mm, and the distortion is the maximum value of 5% at the edge of the field of view.

[0150] In one embodiment, reference Figure 8 As shown, the eyepiece lens module 100 further includes a seventh lens 70 , which is disposed between the second lens 20 and the third lens 30 ; the seventh lens 70 is a curved moon lens.

[0151] That is to say, in this embodiment, the eyepiece lens module includes 9 spherical lenses, the effective focal length of the eyepiece lens module can reach 35mm, the exit pupil diameter can reach 8mm, the exit pupil distance can reach 20mm, the full field of view angle can reach 45°, the half image height can reach 207mm, the half object height can reach 13.05mm, and can match a 1.03-inch micro display screen.

[0152] For example, in this embodiment, the first lens 10 is a biconvex spherical lens, and the image-side focal length f1 of the first lens 10 satisfies The curvature radius R1 of the observation side surface S1 of the first lens 10 and the curvature radius R2 of the display side surface S2 of the first lens 10 satisfy The refractive index n of the first lens 10 is 1d Meets 1.5 <n 1d <1.7, the d-light Abbe number V of the first lens 10 1d Meet 50 <V 1d <70; where EFFL is the effective focal length of the eyepiece lens module.

[0153] Exemplarily, the second lens 20 is a first cemented lens, including a first observation side lens assembly 201 and a first display side lens assembly 202, wherein the first observation side lens assembly 201 is a meniscus lens, and the image side focal length f2 of the first observation side lens assembly 201 satisfies The curvature radius R3 of the observation side surface S3 of the first observation side lens assembly 201 and the curvature radius R4 of the display side surface S4 of the first observation side lens assembly 201 satisfy The refractive index n of the first viewing side lens assembly 201 is 2d Meets 1.5 <n 2d <1.7, d-light Abbe number V of the first observation side lens assembly 201 2d Meet 30 <V 2d <50; the distance d between the first lens 10 and the first observation side lens assembly 201 12 satisfy The first display side lens assembly 202 is a meniscus lens, and the image side focal length f3 of the first display side lens assembly 202 satisfies The curvature radius R4 of the observation side surface S4 of the first display side lens assembly 202 and the curvature radius R5 of the display side surface S5 of the first display side lens assembly 202 satisfy The refractive index n of the first display-side lens assembly 202 is 3d Satisfies 1.4 <n 3d <1.6, the d-light Abbe number V of the first display-side lens assembly 202 3d Meet 70 <V 3d <90; where EFFL is the effective focal length of the eyepiece lens module.

[0154] Exemplarily, in this embodiment, the image-side focal length f4 of the seventh lens element 70 satisfies The curvature radius R6 of the observation side surface S6 of the seventh lens 70 and the curvature radius R7 of the display side surface S7 of the seventh lens 70 satisfy The refractive index of the seventh lens element 70 is n 4d Satisfy 1.5 <n 4d <1.7, the d-light Abbe number V of the seventh lens element 70 4d Meet 55 <V 4d <75; the distance d between the first display side lens assembly and the seventh lens 70 34 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

[0155] Exemplarily, the image-side focal length f5 of the third lens 30 satisfies The curvature radius R8 of the observation-side surface S8 of the third lens 30 and the curvature radius R9 of the display-side surface S9 of the third lens 30 satisfy The refractive index of the third lens 30 is n 5d Satisfies 1.6 <n 5d <1.8, the d-light Abbe number V of the third lens 30 5d Meet 45 <V 5d <65; where EFFL is the effective focal length of the eyepiece lens module.

[0156] Exemplarily, the fourth lens 40 is a biconvex spherical lens, and the image-side focal length f6 of the fourth lens 40 satisfies The curvature radius R of the observation side surface S10 of the fourth lens 40 is 10 and the curvature radius R of the display side surface S11 of the fourth lens 40 11 satisfy The refractive index of the d-light of the fourth lens 40 is n 6d Satisfy 1.5 <n 5d <1.7, the d-light Abbe number V of the fourth lens element 40 6d Meet 50 <V 5d <70; where EFFL is the effective focal length of the eyepiece lens module.

[0157] Exemplarily, the fifth lens 50 is a second cemented lens, including a second observation side lens assembly 501 and a second observation side lens assembly 502, wherein the second observation side lens assembly 501 is a biconcave spherical lens, and the image side focal length f7 of the second observation side lens assembly 501 satisfies The curvature radius R of the observation side surface S12 of the second observation side lens assembly 501 is 12 and the curvature radius R of the display side surface S13 of the second viewing side lens assembly 501 13 satisfy The refractive index of the second viewing side lens assembly 501 is n 7d Meets 1.7 <n 7d <1.9, d-light Abbe number V of the second observation side lens assembly 501 7dMeet 15 <V 7d <35; the distance d between the fourth lens 40 and the second observation side lens assembly 501 67 satisfy The second display side lens assembly 502 is a meniscus lens, and the image side focal length f8 of the second display side lens assembly 502 satisfies The curvature radius R of the observation side surface S13 of the second display side lens assembly 502 13 and the curvature radius R of the display side surface S14 of the second display side lens assembly 502 14 satisfy The refractive index n of the second display-side lens assembly 502 is 8d Meets 1.65 <n 8d <1.85, the d-light Abbe number V of the second display-side lens assembly 502 8d Meet 25 <V 6d <45; where EFFL is the effective focal length of the eyepiece lens module.

[0158] Exemplarily, the sixth lens 60 is a biconcave spherical lens, and the image-side focal length f9 of the sixth lens 60 satisfies The curvature radius R of the observation side surface S15 of the sixth lens 60 is 15 and the curvature radius R of the display side surface S16 of the sixth lens 60 16 satisfy The refractive index of the sixth lens 60 for d light is n 9d Meets 1.7 <n 9d <1.9, the d-light Abbe number V of the sixth lens 60 9d Meet 30 <V 9d <50; the distance d between the second display side lens assembly and the sixth lens 60 89 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

[0159] Exemplarily, the specific surface parameters of each lens of the above-mentioned eyepiece lens module are shown in Table 3.

[0160] Table 3

[0161]

[0162] Among them, the surface serial number represents the serial number of each surface of the image plane, aperture, each lens and object plane arranged in sequence along the direction from the image plane to the object plane; the marking represents the marking serial number of each surface of each lens arranged in sequence along the direction from the image plane to the object plane; it should be noted that for the cemented lens, it includes three surfaces, namely the observation side surface, the cemented surface and the display side surface; for the non-cemented lens, it includes two surfaces, namely the observation side surface and the display side surface.

[0163] refer to Fig. 9 As shown, it shows Figure 8 The modulation transfer function (MTF) curve of the eyepiece lens module shown in the figure includes the meridian sagittal MTF curves of 0 field of view, 9° field of view, 18° field of view and 22.5° field of view; the solid line represents the meridian MTF curve, the dotted line represents the sagittal MTF curve, and different colors represent different fields of view. The MTF value of the edge field of view is 0.2 at 70lp / mm, which meets the imaging requirements of the display screen with a minimum pixel size of 7.2um.

[0164] refer to Fig.10 As shown, it shows Figure 8 The curves of the field curvature and distortion of the eyepiece lens module as the field of view increases are shown. The solid line represents the field curvature change curve in the meridian plane, the dotted line represents the field curvature change curve in the sagittal plane, and the curves of different colors represent the field curvature and distortion curves of different wavelengths. The sagittal field curvature is 0.0551mm, the meridian field curvature is 0.0404mm, and the distortion is the maximum value of 5% at the edge of the field of view.

[0165] In one embodiment, reference Figure 1 As shown, an optical system is proposed, comprising: a display screen 102 and an eyepiece lens module 100 in any of the above embodiments; the display screen 102 is arranged on the display side of the eyepiece lens module 100, that is, the side away from the human eye. The display screen is used to emit outgoing light; the eyepiece lens module is used to receive the outgoing light of the display screen and incident the outgoing light into the human eye to form a virtual image perceived by the human eye.

[0166] Exemplarily, the focal length of the optical system may be greater than or equal to 35 mm, the exit pupil distance may be greater than or equal to 20 mm, the exit pupil diameter may be greater than or equal to 8 mm, and the full field of view angle may be greater than or equal to 45°.

[0167] The optical system provided in the embodiment of the present application can provide a high-definition three-dimensional image display effect, and has the advantages of high clarity, strong immersion, and less distortion. It is not only suitable for use by normal people, but also suitable for use by people wearing glasses. It has a strong sense of immersion, less distortion, and better display effect of three-dimensional imaging.

[0168] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0169] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An eyepiece lens module, characterized in that: include: A first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens are coaxially arranged in sequence from the observation side to the display side; The first lens is a biconvex spherical lens; The second lens is a first cemented lens including a first observation side lens assembly and a first display side lens assembly; the observation side surface of the first cemented lens is a concave surface, and the display side surface of the first cemented lens is a convex surface; The third lens is a biconvex spherical lens; Any one of the fourth lens and the fifth lens is a biconvex spherical lens, and the other of the fourth lens and the fifth lens is a second cemented lens including a second observation side lens assembly and a second display side lens assembly; The sixth lens is a biconcave spherical lens.

2. The eyepiece lens module according to claim 1, characterized in that: The image-side focal length f1 of the first lens satisfies The curvature radius R1 of the observation side surface of the first lens and the curvature radius R2 of the display side surface of the first lens satisfy The refractive index of the first lens is n 1d Meet 1.55 <n 1d <1.75, the d-light Abbe number V of the first lens 1d Meet 45 <V 1d <65; Among them, EFFL is the effective focal length of the eyepiece lens module.

3. The eyepiece lens module according to claim 1, characterized in that: The image side focal length f2 of the first observation side lens assembly satisfies The curvature radius R3 of the observation side surface of the first observation side lens assembly and the curvature radius R4 of the display side surface of the first observation side lens assembly satisfy The refractive index of the first viewing side lens component d is n 2d Meet 1.55 <n 2d <1.75, the d-light Abbe number V of the first observation side lens assembly 2d Meet 30 <V 2d <45; the distance d between the first lens and the first observation side lens assembly 12 satisfy The image side focal length f3 of the first display side lens assembly satisfies The curvature radius R4 of the observation side surface of the first display side lens assembly and the curvature radius R5 of the display side surface of the first display side lens assembly satisfy The refractive index of the first display side lens component is n 3d Meet 1.55 <n 3d <1.75, the d-light Abbe number V of the first display-side lens assembly 3d Meet 55 <V 3d <75; Among them, EFFL is the effective focal length of the eyepiece lens module.

4. The eyepiece lens module according to claim 1, characterized in that: The image side focal length f4 of the third lens satisfies The curvature radius R6 of the observation side surface of the third lens and the curvature radius R7 of the display side surface of the third lens satisfy The refractive index of the third lens d is n 4d Meet 1.55 <n 4d <1.75, the d-light Abbe number V of the third lens 4d Meet 55 <V 4d <75; the distance d between the first display side lens assembly and the third lens 34 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

5. The eyepiece lens module according to claim 1, characterized in that: The fourth lens is a biconvex spherical lens, and the image side focal length f5 of the fourth lens satisfies The curvature radius R8 of the observation side surface of the fourth lens and the curvature radius R9 of the display side surface of the fourth lens satisfy The refractive index of the fourth lens d is n 5d Satisfies 1.6 <n 5d <1.7, the d-light Abbe number V of the fourth lens 5d Meet 40 <V 5d <60; the distance d between the third lens and the fourth lens 45 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

6. The eyepiece lens module according to claim 5, characterized in that: The fifth lens is the second cemented lens, and the image side focal length f6 of the second observation side lens assembly satisfies The curvature radius R of the observation side surface of the second observation side lens assembly 10 and the curvature radius R of the display side surface of the second viewing side lens assembly 11 satisfy The refractive index of the second viewing side lens component d is n 6d Meet 1.55 <n 6d <1.65, the d-light Abbe number V of the second observation side lens assembly 6d Meet 60 <V 6d <70; the distance d between the fourth lens and the second observation side lens assembly 56 satisfy The image side focal length f7 of the second display side lens assembly satisfies The curvature radius R of the observation side surface of the second display side lens assembly 11 and the curvature radius R of the display side surface of the second display side lens assembly 12 satisfy The refractive index of the second display side lens component d is n 7d Meets 1.65 <n 7d <1.85, the d-light Abbe number V of the second display-side lens assembly 7d Meet 25 <V 7d <35; Among them, EFFL is the effective focal length of the eyepiece lens module.

7. The eyepiece lens module according to claim 1, characterized in that: The image side focal length f8 of the sixth lens satisfies The curvature radius R of the observation side surface of the sixth lens 13 and the curvature radius R of the display side surface of the sixth lens 14 satisfy The refractive index of the sixth lens d is n 8d Meets 1.65 <n 8d <1.85, the d-light Abbe number V of the sixth lens 8d Meet 20 <V 8d <35; the distance d between the second display side lens assembly and the sixth lens 78 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

8. The eyepiece lens module according to claim 1, characterized in that: The eyepiece lens module further includes a seventh lens, and the seventh lens is arranged between the second lens and the third lens; The seventh lens is a meniscus lens.

9. The eyepiece lens module according to claim 8, characterized in that: The image-side focal length f1 of the first lens satisfies The curvature radius R1 of the observation side surface of the first lens and the curvature radius R2 of the display side surface of the first lens satisfy The refractive index of the first lens is n 1d Meets 1.5 <n 1d <1.7, the d-light Abbe number V of the first lens 1d Meet 50 <V 1d <70; Among them, EFFL is the effective focal length of the eyepiece lens module.

10. The eyepiece lens module according to claim 8, characterized in that: The image side focal length f2 of the first observation side lens assembly satisfies The curvature radius R3 of the observation side surface of the first observation side lens assembly and the curvature radius R4 of the display side surface of the first observation side lens assembly satisfy The refractive index of the first viewing side lens component d is n 2d Meets 1.5 <n 2d <1.7, the d-light Abbe number V of the first observation side lens assembly 2d Meet 30 <V 2d <50; the distance d between the first lens and the first observation side lens assembly 12 satisfy The image side focal length f3 of the first display side lens assembly satisfies The curvature radius R4 of the observation side surface of the first display side lens assembly and the curvature radius R5 of the display side surface of the first display side lens assembly satisfy The refractive index of the first display side lens component is n 3d Satisfies 1.4 <n 3d <1.6, the d-light Abbe number V of the first display-side lens assembly 3d Meet 70 <V 3d <90; Among them, EFFL is the effective focal length of the eyepiece lens module.

11. The eyepiece lens module according to claim 8, characterized in that: The image-side focal length f4 of the seventh lens satisfies The curvature radius R6 of the observation side surface of the seventh lens and the curvature radius R7 of the display side surface of the seventh lens satisfy The refractive index of the seventh lens d is n 4d Meets 1.5 <n 4d <1.7, the d-light Abbe number V of the seventh lens 4d Meet 55 <V 4d <75; the distance d between the first display side lens assembly and the seventh lens 34 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

12. The eyepiece lens module according to claim 8, characterized in that: The image-side focal length f5 of the third lens satisfies The curvature radius R8 of the observation side surface of the third lens and the curvature radius R9 of the display side surface of the third lens satisfy The refractive index of the third lens d is n 5d Satisfies 1.6 <n 5d <1.8, the d-light Abbe number V of the third lens 5d Meet 45 <V 5d <65; Among them, EFFL is the effective focal length of the eyepiece lens module.

13. The eyepiece lens module according to claim 8, characterized in that: The fourth lens is a biconvex spherical lens, and the image side focal length f6 of the fourth lens satisfies The curvature radius R of the observation side surface of the fourth lens 10 and the curvature radius R of the display side surface of the fourth lens 11 satisfy The refractive index of the fourth lens d is n 6d Meets 1.5 <n 5d <1.7, the d-light Abbe number V of the fourth lens 6d Meet 50 <V 5d <70; Among them, EFFL is the effective focal length of the eyepiece lens module.

14. The eyepiece lens module according to claim 13, characterized in that: The fifth lens is the second cemented lens, and the image side focal length f7 of the second observation side lens assembly satisfies The curvature radius R of the observation side surface of the second observation side lens assembly 12 and the curvature radius R of the display side surface of the second viewing side lens assembly 13 satisfy The refractive index of the second viewing side lens component d is n 7d Meets 1.7 <n 7d <1.9, the d-light Abbe number V of the second observation side lens assembly 7d Meet 15 <V 7d <35; the distance d between the fourth lens and the second observation side lens assembly 67 satisfy The image side focal length f8 of the second display side lens assembly satisfies The curvature radius R of the observation side surface of the second display side lens assembly 13 and the curvature radius R of the display side surface of the second display side lens assembly 14 satisfy The refractive index of the second display side lens component d is n 8d Meets 1.65 <n 8d <1.85, the d-light Abbe number V of the second display-side lens assembly 8d Meet 25 <V 6d <45; Among them, EFFL is the effective focal length of the eyepiece lens module.

15. The eyepiece lens module according to claim 8, characterized in that: The image side focal length f9 of the sixth lens satisfies The curvature radius R of the observation side surface of the sixth lens 15 and the curvature radius R of the display side surface of the sixth lens 16 satisfy The refractive index of the sixth lens d is n 9d Meets 1.7 <n 9d <1.9, the d-light Abbe number V of the sixth lens 9d Meet 30 <V 9d <50; the distance d between the second display side lens assembly and the sixth lens 89 satisfy Among them, EFFL is the effective focal length of the eyepiece lens module.

16. An optical system, characterized in that: include: A display screen and an eyepiece lens module as claimed in any one of claims 1 to 15; The display screen is arranged on the display side of the eyepiece lens module; The display screen is used to emit outgoing light; The eyepiece lens module is used to receive the output light of the display screen and transmit the output light to the human eye to form a virtual image perceived by the human eye.

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