Eyepiece lens module and optical system

Abstract

This application relates to an eyepiece lens module and an optical system. The eyepiece lens module includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged coaxially from the observation side to the display side. 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 cemented lens is concave, and the display-side surface is convex; the third lens is a biconvex spherical lens; either the fourth or fifth lens is a biconvex spherical lens, and the other lens is a second cemented lens comprising a second observation-side lens assembly and a second display-side lens assembly; the sixth lens is a biconcave spherical lens. This eyepiece lens module has advantages such as high clarity, strong immersion, and low distortion, resulting in better 3D imaging display.

Description

Technical Field

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

[0002] With the development of medical technology, minimally invasive surgery has advantages over traditional surgery, including smaller incisions, less pain, less bleeding, and faster recovery, leading to its increasingly widespread application in the medical field. Along with the development of minimally invasive surgery, minimally invasive surgical robots have gradually become essential medical devices in the minimally invasive surgical process.

[0003] Traditionally, open-screen 3D monitors are used to display 3D surgical images captured by minimally invasive surgical robots. However, this method suffers from poor 3D display quality. Summary of the Invention

[0004] Therefore, it is necessary to provide an eyepiece lens module and optical system that can improve the display effect of 3D images to address the above-mentioned technical problems.

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

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

[0007] 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 cemented lens is concave, and the display-side surface of the first cemented lens is convex.

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

[0009] Either the fourth lens or the fifth lens is a biconvex spherical lens, and the other lens is a second cemented lens that includes 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 assembly is a biconcave spherical lens, and the first display-side lens assembly is a biconvex spherical lens;

[0012] The second observation side lens assembly is a biconvex spherical lens, and the second display side lens assembly is a biconcave spherical lens.

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

[0014] The refractive index n of the first lens 1d Satisfies 1.55 <n 1d <1.75, the Abbe number V of the d-beam of the first lens 1d Satisfy 45 <V 1d <65;

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

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

[0017] The refractive index n of the first observation side lens assembly 2d Satisfies 1.55 <n 2d <1.75, the d-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

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

[0019] The refractive index n of the first display-side lens assembly 3d Satisfies 1.55 <n 3d <1.75, the d-abbe number V of the first display-side lens assembly. 3d Satisfy 55 <V 3d <75;

[0020] 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 radius of curvature R6 of the observation side surface of the third lens and the radius of curvature R7 of the display side surface of the third lens satisfy the following conditions:

[0022] The refractive index n of the third lens (d-axis) 4dSatisfies 1.55 <n 4d <1.75, the Abbe number V of the d-beam of the third lens 4d Satisfy 55 <V 4d <75; the distance d between the first display-side lens assembly and the third lens 34 satisfy

[0023] 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 radius of curvature R8 of the observation side surface and the radius of curvature R9 of the display side surface of the fourth lens satisfy the following conditions:

[0025] The refractive index n of the fourth lens (d-ray) 5d Satisfies 1.6 <n 5d <1.7, the Abbe number V of the d-beam of the fourth lens 5d Satisfy 40 <V 5d <60; the distance d between the third and fourth lenses 45 satisfy

[0026] 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 The radius of curvature R of the display-side surface of the second observation-side lens assembly 11 satisfy

[0028] The refractive index n of the second observation side lens assembly 6d Satisfies 1.55 <n 6d <1.65, the d-abbe number V of the second observation side lens assembly. 6d Satisfy 60 <V 6d <70; 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 radius of curvature R of the observation side surface of the second display-side lens assembly 11 The radius of curvature R of the display-side surface of the second display-side lens assembly 12 satisfy

[0030] The refractive index n of the second display-side lens assembly 7d Satisfies 1.65 <n 7d <1.85, the d-abbe number V of the second display-side lens assembly. 7d Satisfy 25 <V 7d <35;

[0031] 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 satisfies The radius of curvature R of the observation side surface of the sixth lens 13 The radius of curvature R of the display side surface of the sixth lens 14 satisfy

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

[0034] 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 radius of curvature R1 of the observation side surface and the radius of curvature R2 of the display side surface of the first lens satisfy the following conditions:

[0036] The refractive index n of the first lens 1d Satisfies 1.55 <n 1d <1.7, the Abbe number V of the d-beam of the first lens 1d Satisfy 50 <V 1d <70;

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

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

[0039] The refractive index n of the first observation side lens assembly2d Satisfies 1.5 <n 2d <1.7, the d-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

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

[0041] The refractive index n of the first display-side lens assembly 3d Satisfies 1.4 <n 3d <1.6, the d-abbe number V of the first display-side lens assembly 3d Satisfy 70 <V 3d <90;

[0042] 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 radius of curvature R6 of the observation side surface of the third lens and the radius of curvature R7 of the display side surface of the third lens satisfy the following conditions:

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

[0045] 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 radius of curvature R8 of the observation side surface of the second observation side lens assembly and the radius of curvature R9 of the display side surface of the second observation side lens assembly satisfy the following conditions:

[0047] The refractive index n of the second observation side lens assembly 5d Satisfies 1.5 <n 5d<1.7, the d-abbe number V of the second observation side lens assembly 5d Satisfy 45 <V 5d <65; 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 radius of curvature R9 of the observation side surface of the second display-side lens assembly and the radius of curvature R of the display side surface of the second display-side lens assembly. 10 satisfy

[0049] The refractive index n of the second display-side lens assembly 6d Satisfies 1.5 <n 6d <1.7, the d-abbe number V of the second display-side lens assembly 6d Satisfy 25 <V 6d <45;

[0050] 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 radius of curvature R of the observation side surface of the fifth lens 11 The radius of curvature R of the display side surface of the fifth lens 12 satisfy

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

[0053] 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 satisfies The radius of curvature R of the observation side surface of the sixth lens 13 The radius of curvature R of the display side surface of the sixth lens 14 satisfy

[0055] The refractive index n of the sixth lens (d-ray) 8d Meets 1.65 <n 8d<1.85, the Abbe number V of the d-beam of the sixth lens 8d Satisfy 15 <V 8d <35; the distance d between the fifth and sixth lenses 78 satisfy

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

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

[0058] The seventh lens is a crescent-shaped lens.

[0059] In one embodiment, the first observation-side lens assembly is a meniscus lens; the first display-side lens assembly is a crescent 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 radius of curvature R1 of the observation side surface and the radius of curvature R2 of the display side surface of the first lens satisfy the following conditions:

[0062] The refractive index n of the first lens 1d Satisfies 1.5 <n 1d <1.7, the Abbe number V of the d-beam of the first lens 1d Satisfy 50 <V 1d <70;

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

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

[0065] The refractive index n of the first observation side lens assembly 2d Satisfies 1.5 <n 2d <1.7, the d-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

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

[0067] The refractive index n of the first display-side lens assembly 3d Satisfies 1.4 <n 3d <1.6, the d-abbe number V of the first display-side lens assembly 3d Satisfy 70 <V 3d <90;

[0068] 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 satisfies The radius of curvature R6 of the observation side surface and the radius of curvature R7 of the display side surface of the seventh lens satisfy the following conditions:

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

[0071] 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 satisfies The radius of curvature R8 of the observation side surface of the third lens and the radius of curvature R9 of the display side surface of the third lens satisfy the following conditions:

[0073] The refractive index n of the third lens (d-axis) 5d Satisfies 1.6 <n 5d <1.8, the Abbe number V of the d-beam of the third lens 5d Satisfy 45 <V 5d <65;

[0074] 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 radius of curvature R of the observation side surface of the fourth lens 10 The radius of curvature R of the display side surface of the fourth lens11 satisfy

[0076] The refractive index n of the fourth lens (d-ray) 6d Satisfies 1.5 <n 5d <1.7, the Abbe number V of the d-beam of the fourth lens 6d Satisfy 50 <V 5d <70;

[0077] 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 The radius of curvature R of the display-side surface of the second observation-side lens assembly 13 satisfy

[0079] The refractive index n of the second observation side lens assembly 7d Satisfies 1.7 <n 7d <1.9, the d-abbe number V of the second observation side lens assembly 7d Satisfy 15 <V 7d <35; 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 radius of curvature R of the observation side surface of the second display-side lens assembly 13 The radius of curvature R of the display-side surface of the second display-side lens assembly 14 satisfy

[0081] The refractive index n of the second display-side lens assembly 8d Meets 1.65 <n 8d <1.85, the d-abbe number V of the second display-side lens assembly. 8d Satisfy 25 <V 6d <45;

[0082] 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 satisfies The radius of curvature R of the observation side surface of the sixth lens 15 The radius of curvature R of the display side surface of the sixth lens 16 satisfy

[0084] The refractive index n of the sixth lens (d-ray) 9d Satisfies 1.7 <n 9d <1.9, the Abbe number V of the d-beam 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

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

[0086] Secondly, this application also provides an optical system. The optical system includes: a display screen and the eyepiece lens module described in the first aspect; the display screen is disposed on the display side of the eyepiece lens module;

[0087] The display screen is used to emit emitted light;

[0088] The eyepiece lens module is used to receive the light emitted from the display screen and direct the emitted 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 35mm, the exit pupil distance is greater than or equal to 20mm, the exit pupil diameter is greater than or equal to 8mm, and the full field of view is greater than or equal to 45°.

[0090] The aforementioned eyepiece lens module and optical system include an eyepiece lens module comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged coaxially from the observation side to the display side. 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 cemented lens is concave, and the display-side surface is convex; the third lens is a biconvex spherical lens; either the fourth or fifth lens is a biconvex spherical lens, and the other lens is a second cemented lens comprising a second observation-side lens assembly and a second display-side lens assembly; the sixth lens is a biconcave spherical lens. This eyepiece lens module features high clarity, strong immersion, and low distortion. When using this eyepiece lens module for 3D imaging, it can provide a high full field of view and exit pupil distance, not only without affecting the use by people wearing glasses but also improving the display effect of 3D images. Attached Figure Description

[0091] Figure 1 This is a schematic diagram of the structure of the eyepiece lens module provided in the embodiments of this application;

[0092] Figure 2This is another structural schematic diagram of the eyepiece lens module provided in the embodiments of this application;

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

[0094] Figure 4 for Figure 2 The graph shows the field curvature and distortion of the eyepiece lens module as the field of view increases.

[0095] Figure 5 This is another structural schematic diagram of the eyepiece lens module provided in the embodiments of this application;

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

[0097] Figure 7 for Figure 5 The graph shows the field curvature and distortion of the eyepiece lens module as the field of view increases.

[0098] Figure 8 This is another structural schematic diagram of the eyepiece lens module provided in the embodiments of this application;

[0099] Figure 9 for Figure 8 The MTF curve of the eyepiece lens module is shown below;

[0100] Figure 10 for Figure 8 The graph shows the field curvature and distortion of the eyepiece lens module as the field of view increases. Detailed Implementation

[0101] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0102] The eyepiece lens module provided in this application embodiment is applicable to 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 medical devices that use advanced technology to perform surgery, have become an important part of the modern medical field. Traditionally, when performing minimally invasive surgery using a minimally invasive surgical robot, the doctor operates the robot to perform the surgery using 3D intraoperative images displayed on an open 3D screen monitor.

[0104] However, with the development of medical technology, traditional open-screen 3D display technology is increasingly unable to meet the needs of doctors. For example, traditional 3D displays can only provide limited stereoscopic effect and cannot offer a truly immersive experience. The resolution of traditional 3D displays has limited image quality, and they only offer limited viewing angles; users must maintain a certain distance and focus to obtain the best stereoscopic effect. In general, using open-screen 3D monitors results in poor 3D display quality.

[0105] With the development of VR technology, its application in minimally invasive surgical robots is attracting increasing attention. VR technology can provide doctors with a more realistic and immersive surgical environment, thereby improving their surgical skills and accuracy, and reducing surgical risks and complications. For VR technology to be applied to surgical robots, VR optical eyepieces are a key component. VR eyepieces offer better immersion optically, completely surrounding the user's field of vision, thus providing a more realistic and immersive surgical environment. In minimally invasive surgical robots, VR eyepieces can be used to display the surgical area and surgical instruments, allowing doctors to operate the robot more accurately. Furthermore, VR eyepieces can be equipped with components that track the user's head movements to provide better spatial perception. VR eyepieces can also be paired with miniature high-resolution displays for each eye to provide higher resolution. In addition, VR eyepieces can be used to train doctors, allowing them to practice in simulated surgical environments.

[0106] Based on the above analysis, this application proposes a high-definition VR eyepiece with a wide field of view and low distortion, which provides a more efficient and safer surgical solution for minimally invasive surgical robots, offers a better surgical experience and results, and improves the success rate of surgery and the survival rate of patients.

[0107] The technical solution of this application and how it solves the above-mentioned technical problems will be described in detail below with specific embodiments. These 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 this application will be described below with reference to the accompanying drawings.

[0108] Figure 1 This is a schematic diagram of the eyepiece lens module provided in an embodiment of this 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 arranged coaxially from the observation side to the display side.

[0109] Among them, the observation side has an eyepiece lens module 100 close to the human eye (such as...). Figure 1 The exit pupil surface 101 (as shown in the diagram) is on one side, while the display side is the side of the eyepiece module 100 furthest from the human eye, i.e., closer to the display screen (such as...). Figure 1 The display screen 102 shown is located on one side. The display screen 102 is used to output and display three-dimensional images. The light from the three-dimensional image displayed on the display screen 102 passes through the eyepiece lens module 100 and shines on the exit pupil surface 101 of the human eye, thereby forming a three-dimensional virtual image perceived by the human eye.

[0110] For example, 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 cementing two lens assemblies together, and the combined lens is called the first cemented lens; wherein, the lens assembly closer to the human eye in the first cemented lens can be called the first observation-side lens assembly, and the lens assembly closer to the display screen can be called the first display-side lens assembly.

[0111] Furthermore, since the first observation-side lens assembly and the first display-side lens assembly are cemented together, the first observation-side lens assembly originally includes a first surface near the human eye and a second surface away from the human eye, while the first display-side lens assembly includes a third surface near the human eye and a fourth surface away from the human eye. After cementing the first observation-side lens assembly and the first display-side lens assembly, the second surface of the first observation-side lens assembly overlaps with the third surface of the first display-side lens assembly. This results in the cemented first lens, i.e., the second lens 20, including the first surface of the first observation-side lens assembly near the human eye, the fourth surface of the first display-side lens assembly away from the human eye, and the cemented surface where the two lens assemblies overlap (e.g., the first surface near the human eye). Figure 2 (The middle dashed surface of the second lens 20). 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 closer 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 farther 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] The observation-side surface of the second lens 20 (i.e., the first cemented lens) is concave, and the display-side surface of the second lens 20 (i.e., the first cemented lens) is convex. Optionally, the intermediate cemented surface of the second lens 20 (i.e., the first cemented lens) can be flat, and the intermediate 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 this embodiment, the shape of the intermediate cemented surface of the second lens 20 is not specifically limited.

[0113] For example, refer to Figure 1 As shown, when the middle cemented surface of the second lens 20 (i.e., the first cemented lens) is close to the observation side surface of the second lens 20, the first observation side lens assembly is a biconcave spherical lens, and the first display side lens assembly is a biconvex spherical lens; when the middle cemented surface of the second lens 20 (i.e., the first cemented lens) is flat, the first observation side lens assembly can be a meniscus lens, and the first display side lens assembly is a meniscus lens.

[0114] For example, the third lens 30 of the eyepiece lens module 100 can be a biconvex spherical lens; either the fourth lens 40 or the fifth lens 50 is a biconvex spherical lens, and the other lens of the fourth lens 40 or 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 composite lens, i.e., a second cemented lens; or, in another case, the fourth lens 40 can also be a composite lens, i.e., a second cemented lens, and the fifth lens 50 can be a biconvex spherical lens. Additionally, the sixth lens 60 can be a biconcave spherical lens.

[0115] For example, referring to the first cemented lens described above, the second cemented lens may also include three surfaces: the observation-side surface of the second cemented lens, the intermediate 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 can be concave or convex. In addition, the surface morphology 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, can be the same or different. For example, they can both be concave, or both can be convex, or one can be concave and the other can be convex, etc. The embodiments of this application do not specifically limit this.

[0116] The lenses in the eyepiece lens module described above can be made of materials such as glass, resin, or PC. This application does not specifically limit the materials used in this embodiment.

[0117] Refer to the above Figure 1As shown, when using the above-mentioned eyepiece lens module for three-dimensional imaging, the light emitted from 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 before reaching 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 this application has the advantage of high definition, with a central field-of-view MTF value of over 0.7 at 70 lp / mm and a peripheral field-of-view MTF value of 0.2 at 70 lp / mm, making it compatible with a 1.03-inch 2K resolution display. The MTF value (Modulation Transfer Function) is a numerical value that comprehensively evaluates the sharpness, contrast, and resolution of a lens. Furthermore, this eyepiece lens module has an exit pupil distance of approximately 20mm, which does not affect the use by people who wear glasses. Moreover, the full field of view of this eyepiece lens module can reach approximately 45°, providing a strong sense of immersion and minimal distortion, with a maximum distortion 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 arranged coaxially from the observation side to the display side. 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 cemented lens is concave, and the display-side surface is convex; the third lens is a biconvex spherical lens; either the fourth or fifth lens is a biconvex spherical lens, and the other lens is a second cemented lens comprising a second observation-side lens assembly and a second display-side lens assembly; the sixth lens is a biconcave spherical lens. This eyepiece lens module features high clarity, strong immersion, and low distortion. When using this eyepiece lens module for 3D imaging, it can provide a high full field of view and exit pupil distance, not only without affecting the use by people wearing glasses but also improving the display effect of 3D images.

[0120] In one embodiment, an eyepiece lens module is provided, wherein the first observation-side lens assembly of the eyepiece lens module can be a biconcave spherical lens, 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 this eyepiece lens module structure, two eyepiece lens modules with different parameter ranges are provided below.

[0122] First type: Reference Figure 2 The eyepiece lens module structure is 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 of up to 45°, an exit pupil diameter of up to 8mm, a working wavelength between 0.46um and 0.66um, and an object height of up to 13.3mm, which can be adapted to a 1.03-inch micro display screen.

[0124] For example, the first lens 10 is a biconvex spherical lens, and the image-side focal length f1 of the first lens 10 satisfies The radius of curvature R1 of the observation side surface S1 of the first lens 10 and the radius of curvature R2 of the display side surface S2 of the first lens 10 satisfy the following conditions: The refractive index n of the first lens 10 is d-ray. 1d Satisfies 1.55 <n 1d <1.75, the Abbe number V of the d-ray of the first lens 10 1d Satisfy 45 <V 1d <65; where 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 at which the human eye is most sensitive is 555nm, and d light is a light wave that is relatively close to this wavelength.

[0125] For example, 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 radius of curvature R3 of the observation side surface S3 of the first observation side lens assembly 201 and the radius of curvature R4 of the display side surface S4 of the first observation side lens assembly 201 satisfy the following conditions: The d-ray refractive index n of the first observation side lens assembly 201 2d Satisfies 1.55 <n 2d <1.75, the d-optical 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 radius of curvature R4 of the observation side surface S4 of the first display side lens assembly 202 and the radius of curvature R5 of the display side surface S5 of the first display side lens assembly 202 satisfy the following conditions: The d-ray refractive index n of the first display-side lens assembly 202 3d Satisfies 1.55 <n 3d <1.75, the d-optical Abbe number V of the first display-side lens assembly 202 3dSatisfy 55 <V 3d <75; where EFFL is the effective focal length of the eyepiece lens module.

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

[0127] For example, the fourth lens 40 is a biconvex spherical lens, and the image-side focal length f5 of the fourth lens 40 satisfies The radius of curvature R8 of the observation side surface S8 of the fourth lens 40 and the radius of curvature R9 of the display side surface S9 of the fourth lens 40 satisfy the following conditions: The refractive index n of the fourth lens 40 is d-ray. 5d Satisfies 1.6 <n 5d <1.7, the Abbe number V of the fourth lens at 40° is d-ray. 5d Satisfy 40 <V 5d <60; the distance d between the third lens 30 and the fourth lens 40 45 satisfy EFFL is the effective focal length of the eyepiece lens module.

[0128] For example, 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 radius of curvature R of the observation side surface S10 of the second observation side lens assembly 501 10 The radius of curvature R of the display side surface S11 of the second observation side lens assembly 501 11 satisfy The refractive index n of the second observation side lens assembly 501 6d Satisfies 1.55 <n 6d <1.65, the d-optical Abbe number V of the second observation side lens assembly 501 6d Satisfy 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 radius of curvature R of the observation side surface S11 of the second display side lens assembly 502 11 The radius of curvature 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 7d Meets 1.65 <n 7d <1.85, the d-abbe number V of the second display-side lens assembly 502. 7d Satisfy 25 <V 7d <35; where EFFL is the effective focal length of the eyepiece lens module.

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

[0130] For example, Table 1 shows the specific surface parameters of each lens in the above-described eyepiece lens module.

[0131] Table 1

[0132]

[0133] The surface number indicates the sequence number of the exit pupil surface, each lens, and each surface of the display screen arranged sequentially along the direction from the exit pupil surface to the display screen; the label indicates the label number of each surface of each lens arranged sequentially along the direction from the exit pupil surface to the display screen; it should be noted that for cemented lenses, there are three surfaces, namely the observation side surface, the cemented surface, and the display side surface; for non-cemented lenses, there are two surfaces, namely the observation side surface and the display side surface.

[0134] refer to Figure 3 As shown, it illustrates Figure 2 The modulation transfer function (MTF) curves of the eyepiece lens module shown include meridional and sagittal MTF curves for 0°, 9°, 18°, and 22.5° fields of view. Solid lines represent meridional MTF curves, dashed lines represent sagittal MTF curves, and different colors represent different fields of view. The MTF value at the edge field of view is 0.2 at 70 lp / mm, meeting the imaging requirement of a minimum display pixel size of 7.2 μm.

[0135] refer to Figure 4 As shown, it illustrates Figure 2 The graph shows the field curvature and distortion of the eyepiece lens module as the field of view increases. Solid lines represent the field curvature variation in the meridional plane, dashed lines represent the field curvature variation in the sagittal plane, and different colored curves represent field curvature and distortion curves at different wavelengths. The sagittal field curvature is 0.0602 mm, the meridional field curvature is 0.041 mm, and the distortion reaches its maximum value of 5% at the edge of the field of view.

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

[0137] 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 of up to 45°, and an exit pupil diameter of up to 8mm.

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

[0139] For example, 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 radius of curvature R3 of the observation side surface S3 of the first observation side lens assembly 201 and the radius of curvature R4 of the display side surface S4 of the first observation side lens assembly 201 satisfy the following conditions: The d-ray refractive index n of the first observation side lens assembly 201 2d Satisfies 1.5 <n 2d <1.7, the d-optical 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 radius of curvature R4 of the observation side surface S4 of the first display side lens assembly 202 and the radius of curvature R5 of the display side surface S5 of the first display side lens assembly 202 satisfy the following conditions: The d-ray refractive index n of the first display-side lens assembly 202 3d Satisfies 1.4 <n 3d <1.6, the d-optical Abbe number V of the first display-side lens assembly 202 3d Satisfy 70 <V 3d <90; where EFFL is the effective focal length of the eyepiece lens module.

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

[0141] For example, 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 radius of curvature R8 of the observation side surface S8 of the second observation side lens assembly 401 and the radius of curvature R9 of the display side surface S9 of the second observation side lens assembly 401 satisfy the following conditions: The refractive index n of the second observation side lens assembly 401 5d Satisfies 1.5 <n 5d <1.7, the d-abbe number V of the second observation side lens assembly 4015d Satisfy 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 radius of curvature R9 of the observation side surface S9 of the second display side lens assembly 402 and the radius of curvature R of the display side surface S10 of the second display side lens assembly 402. 10 satisfy The refractive index n of the second display side lens assembly 402 6d Satisfies 1.5 <n 6d <1.7, the d-abbe number V of the second display side lens assembly 402 6d Satisfy 25 <V 6d <45; where EFFL is the effective focal length of the eyepiece lens module.

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

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

[0144] For example, Table 2 shows the specific surface parameters of each lens in the above-described eyepiece lens module.

[0145] Table 2

[0146]

[0147] The surface number indicates the sequence number of the image plane, aperture, each lens, and each surface of the object plane arranged sequentially along the direction from the image plane to the object plane; the label indicates the label number of each surface of each lens arranged sequentially along the direction from the image plane to the object plane; it should be noted that for cemented lenses, there are three surfaces, namely the observation side surface, the cemented surface, and the display side surface; for non-cemented lenses, there are two surfaces, namely the observation side surface and the display side surface.

[0148] refer to Figure 6 As shown, it illustrates Figure 5 The modulation transfer function (MTF) curves of the eyepiece lens module shown include meridional and sagittal MTF curves for 0°, 9°, 18°, and 22.5° fields of view. Solid lines represent meridional MTF curves, dashed lines represent sagittal MTF curves, and different colors represent different fields of view. The MTF value at the edge field of view is 0.2 at 70 lp / mm, meeting the imaging requirement of a minimum display pixel size of 7.2 μm.

[0149] refer to Figure 7 As shown, it illustrates Figure 5 The graph shows the field curvature and distortion of the eyepiece lens module as the field of view increases. The solid line represents the field curvature variation curve in the meridional plane, and the dashed line represents the field curvature variation curve in the sagittal plane. Different colored curves represent the field curvature and distortion curves for different wavelengths. The sagittal field curvature is 0.0558 mm, the meridional field curvature is 0.0374 mm, and the distortion reaches its 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 also includes a seventh lens 70, which is disposed between the second lens 20 and the third lens 30; the seventh lens 70 is a crescent-shaped lens.

[0151] In other words, 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 can reach 45°, the half-image height can reach 207mm, the half-object height can reach 13.05mm, and it can be matched with 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 radius of curvature R1 of the observation side surface S1 of the first lens 10 and the radius of curvature R2 of the display side surface S2 of the first lens 10 satisfy the following conditions: The refractive index n of the first lens 10 is d-ray. 1d Satisfies 1.5 <n 1d <1.7, the Abbe number V of the d-ray of the first lens 10 1d Satisfy 50 <V 1d <70; where EFFL is the effective focal length of the eyepiece lens module.

[0153] For example, 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 radius of curvature R3 of the observation side surface S3 of the first observation side lens assembly 201 and the radius of curvature R4 of the display side surface S4 of the first observation side lens assembly 201 satisfy the following conditions: The d-ray refractive index n of the first observation side lens assembly 201 2d Satisfies 1.5 <n 2d <1.7, the d-optical 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 crescent-shaped lens, and the image-side focal length f3 of the first display-side lens assembly 202 satisfies The radius of curvature R4 of the observation side surface S4 of the first display side lens assembly 202 and the radius of curvature R5 of the display side surface S5 of the first display side lens assembly 202 satisfy the following conditions: The d-ray refractive index n of the first display-side lens assembly 202 3d Satisfies 1.4 <n 3d <1.6, the d-optical Abbe number V of the first display-side lens assembly 202 3d Satisfy 70 <V 3d <90; where EFFL is the effective focal length of the eyepiece lens module.

[0154] For example, in this embodiment, the image-side focal length f4 of the seventh lens 70 satisfies The radius of curvature R6 of the observation side surface S6 of the seventh lens 70 and the radius of curvature R7 of the display side surface S7 of the seventh lens 70 satisfy the following conditions: The d-index of the seventh lens 70 is n 4d Satisfies 1.5 <n 4d <1.7, Abbe number V of the d-ray of the seventh lens at 70° 4d Satisfy 55 <V 4d <75; the distance d between the first display-side lens assembly and the seventh lens 70 34 satisfy EFFL is the effective focal length of the eyepiece lens module.

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

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

[0157] For example, 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 radius of curvature R of the observation side surface S12 of the second observation side lens assembly 501 12 The radius of curvature R of the display side surface S13 of the second observation side lens assembly 501 13 satisfy The refractive index n of the second observation side lens assembly 501 7d Satisfies 1.7 <n 7d <1.9, the d-abbe number V of the second observation side lens assembly 501 7dSatisfy 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 radius of curvature R of the observation side surface S13 of the second display side lens assembly 502 13 The radius of curvature 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 8d Meets 1.65 <n 8d <1.85, the d-abbe number V of the second display-side lens assembly 502. 8d Satisfy 25 <V 6d <45; where EFFL is the effective focal length of the eyepiece lens module.

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

[0159] For example, Table 3 shows the specific surface parameters of each lens in the above-described eyepiece lens module.

[0160] Table 3

[0161]

[0162] The surface number indicates the sequence number of the image plane, aperture, each lens, and each surface of the object plane arranged sequentially along the direction from the image plane to the object plane; the label indicates the label number of each surface of each lens arranged sequentially along the direction from the image plane to the object plane; it should be noted that for cemented lenses, there are three surfaces, namely the observation side surface, the cemented surface, and the display side surface; for non-cemented lenses, there are two surfaces, namely the observation side surface and the display side surface.

[0163] refer to Figure 9 As shown, it illustrates Figure 8 The modulation transfer function (MTF) curves of the eyepiece lens module shown include meridional and sagittal MTF curves for 0°, 9°, 18°, and 22.5° fields of view. Solid lines represent meridional MTF curves, dashed lines represent sagittal MTF curves, and different colors represent different fields of view. The MTF value at the edge field of view is 0.2 at 70 lp / mm, meeting the imaging requirement of a minimum display pixel size of 7.2 μm.

[0164] refer to Figure 10 As shown, it illustrates Figure 8 The graph shows the field curvature and distortion of the eyepiece lens module as the field of view increases. The solid line represents the field curvature variation curve in the meridional plane, and the dashed line represents the field curvature variation curve in the sagittal plane. Different colored curves represent the field curvature and distortion curves for different wavelengths. The sagittal field curvature is 0.0551 mm, the meridional field curvature is 0.0404 mm, and the distortion reaches its 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, including: a display screen 102 and an eyepiece lens module 100 as described in any of the above embodiments; the display screen 102 is disposed on the display side of the eyepiece lens module 100, i.e., 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 from the display screen and direct the outgoing light to the human eye to form a virtual image perceived by the human eye.

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

[0167] The optical system provided in this application embodiment can provide a high-definition three-dimensional image display effect, with advantages such as high clarity, strong immersion, and low distortion. It is not only suitable for use by normal people, but also for people who wear glasses. It has a strong immersion, low distortion, and better three-dimensional imaging display effect.

[0168] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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 are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An eyepiece lens module, characterized in that, include: The first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens are arranged coaxially from the observation side to the display side. 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 cemented lens is concave, and the display-side surface of the first cemented lens is convex; the third lens is a biconvex spherical lens; Either the fourth lens or the fifth lens is a biconvex spherical lens, and the other lens is a second cemented 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 also includes a seventh lens, which is disposed between the second lens and the third lens; The seventh lens is a crescent-shaped 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 radius of curvature R1 of the observation side surface of the first lens and the radius of curvature R2 of the display side surface of the first lens satisfy... The d-index of the first lens is n 1d Satisfies 1.55 <n 1d <1.75, the Abbe number V of the first lens is d-ray. 1d Satisfy 45 <V 1d <65; Wherein, 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 radius of curvature R3 of the observation-side surface of the first observation-side lens assembly and the radius of curvature R4 of the display-side surface of the first observation-side lens assembly satisfy the following conditions: The d-ray refractive index n of the first observation-side lens assembly 2d Satisfies 1.55 <n 2d <1.75, the d-optical Abbe number V of the first observation-side lens assembly 2d Satisfy 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 radius of curvature R4 of the observation side surface of the first display-side lens assembly and the radius of curvature R5 of the display side surface of the first display-side lens assembly satisfy the following conditions: The d-index of the first display-side lens assembly 3d Satisfies 1.55 <n 3d <1.75, the d-abbe number V of the first display-side lens assembly 3d Satisfy 55 <V 3d <75; Wherein, 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 radius of curvature R6 of the observation side surface of the third lens and the radius of curvature R7 of the display side surface of the third lens satisfy the following conditions: The refractive index n of the third lens is d. 4d Satisfies 1.55 <n 4d <1.75, the Abbe number V of the third lens is d-ray. 4d Satisfy 55 <V 4d <75; the distance d between the first display-side lens assembly and the third lens 34 satisfy Wherein, 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 radius of curvature R8 of the observation side surface of the fourth lens and the radius of curvature R9 of the display side surface of the fourth lens satisfy the following conditions: The refractive index n of the fourth lens 5d Satisfies 1.6 <n 5d <1.7, the Abbe number V of the fourth lens. 5d Satisfy 40 <V 5d <60; the distance d between the third lens and the fourth lens 45 satisfy Wherein, 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 radius of curvature R of the observation side surface of the second observation side lens assembly 10 and the radius of curvature R of the display-side surface of the second observation-side lens assembly 11 satisfy The d-index of the second observation-side lens assembly 6d Satisfies 1.55 <n 6d <1.65, the d-abbe number V of the second observation-side lens assembly. 6d Satisfy 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 radius of curvature R of the observation side surface of the second display-side lens assembly 11 The radius of curvature R of the display-side surface of the second display-side lens assembly 12 satisfy The d-index of the second display-side lens assembly 7d Meets 1.65 <n 7d <1.85, the d-abbe number V of the second display-side lens assembly. 7d Satisfy 25 <V 7d <35; Wherein, 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 radius of curvature R of the observation side surface of the sixth lens 13 and the radius of curvature R of the display side surface of the sixth lens 14 satisfy The refractive index n of the sixth lens 8d Meets 1.65 <n 8d <1.85, the Abbe number V of the sixth lens is d-ray. 8d Satisfy 20 <V 8d <35; The distance d between the second display-side lens assembly and the sixth lens 78 satisfy Wherein, EFFL is the effective focal length of the eyepiece lens module.

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

9. 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 radius of curvature R3 of the observation-side surface of the first observation-side lens assembly and the radius of curvature R4 of the display-side surface of the first observation-side lens assembly satisfy the following conditions: The d-ray refractive index n of the first observation-side lens assembly 2d Satisfies 1.5 <n 2d <1.7, the d-abbe number V of the first observation-side lens assembly 2d Satisfy 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 radius of curvature R4 of the observation side surface of the first display-side lens assembly and the radius of curvature R5 of the display side surface of the first display-side lens assembly satisfy the following conditions: The d-index of the first display-side lens assembly 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; Wherein, EFFL is the effective focal length of the eyepiece lens module.

10. The eyepiece lens module according to claim 1, characterized in that, The image-side focal length f4 of the seventh lens satisfies The radius of curvature R6 of the observation side surface of the seventh lens and the radius of curvature R7 of the display side surface of the seventh lens satisfy the following conditions: The refractive index n of the seventh lens 4d Satisfies 1.5 <n 4d <1.7, the Abbe number V of the seventh lens in d-rays 4d Satisfy 55 <V 4d <75; the distance d between the first display-side lens assembly and the seventh lens 34 satisfy Wherein, EFFL is the effective focal length of the eyepiece lens module.

11. The eyepiece lens module according to claim 1, characterized in that, The image-side focal length f5 of the third lens satisfies The radius of curvature R8 of the observation side surface of the third lens and the radius of curvature R9 of the display side surface of the third lens satisfy the following conditions: The refractive index n of the third lens is d. 5d Satisfies 1.6 <n 5d <1.8, the Abbe number V of the third lens. 5d Satisfy 45 <V 5d <65; Wherein, EFFL is the effective focal length of the eyepiece lens module.

12. 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 f6 of the fourth lens satisfies... The radius of curvature R of the observation side surface of the fourth lens 10 and the radius of curvature R of the display side surface of the fourth lens 11 satisfy The refractive index n of the fourth lens 6d Satisfies 1.5 <n 5d <1.7, the Abbe number V of the fourth lens. 6d Satisfy 50 <V 5d <70; Wherein, EFFL is the effective focal length of the eyepiece lens module.

13. The eyepiece lens module according to claim 12, 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 radius of curvature R of the observation side surface of the second observation side lens assembly 12 and the radius of curvature R of the display-side surface of the second observation-side lens assembly 13 satisfy The d-index of the second observation-side lens assembly 7d Satisfies 1.7 <n 7d <1.9, the d-abbe number V of the second observation-side lens assembly 7d Satisfy 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 radius of curvature R of the observation side surface of the second display-side lens assembly 13 The radius of curvature R of the display-side surface of the second display-side lens assembly 14 satisfy The d-index of the second display-side lens assembly 8d Meets 1.65 <n 8d <1.85, the d-abbe number V of the second display-side lens assembly. 8d Satisfy 25 <V 6d <45; Wherein, EFFL is the effective focal length of the eyepiece lens module.

14. The eyepiece lens module according to claim 1, characterized in that, The image-side focal length f9 of the sixth lens satisfies The radius of curvature R of the observation side surface of the sixth lens 15 and the radius of curvature R of the display side surface of the sixth lens 16 satisfy The refractive index n of the sixth lens 9d Satisfies 1.7 <n 9d <1.9, the Abbe number V of the sixth lens is d-ray. 9d Satisfy 30 <V 9d <50; the distance d between the second display-side lens assembly and the sixth lens 89 satisfy Wherein, EFFL is the effective focal length of the eyepiece lens module.

15. An optical system, characterized in that, include: The display screen and the eyepiece lens module as described in any one of claims 1 to 14; The display screen is located on the display side of the eyepiece lens module; The display screen is used to emit emitted light; The eyepiece lens module is used to receive the light emitted from the display screen and direct the emitted light into the human eye to form a virtual image perceived by the human eye.

Images