VR Eyepiece System

Abstract

The present invention relates to a VR eyepiece system, comprising: a lens assembly, which includes a first lens, a second lens, a third lens, and a fourth lens coaxially arranged in sequence from the eye side to the image side; a quarter-wave plate, which is attached to the image side of the polarization reflection film; a semi-transmissive and semi-reflective film, which is attached to the image side of the third lens; a display component, which is arranged on the image side of the fourth lens; the VR eyepiece system satisfies the following relational expression: 1.35 < TTL·tan(SEMI-FOV) / IMGh < 1.6; wherein, TTL is the axial distance from the eye side of the first lens to the display component, SEMI-FOV is the half field of view angle of the VR eyepiece system, and IMGh is half of the diagonal length of the effective pixel area on the image plane of the VR eyepiece system. The VR eyepiece system of the present application can optimize the imaging quality, provide a comfortable visual experience, and reduce the eye fatigue of users during long-term use by designing the ratio relationship between multiple key parameters.

Description

Technical Field

[0001] The present invention relates to the technical field of VR devices, and particularly to a VR eyepiece system. Background Art

[0002] The rapid development of virtual reality (VR) technology has brought many benefits to users. VR technology can provide an immersive experience, enabling users to be in a virtual world, and has brought revolutionary changes to fields such as education, entertainment training, etc. VR technology is widely used in fields such as games, virtual tourism, healthcare, and architectural design, showing great commercial potential in the market.

[0003] Currently, existing VR devices still have deficiencies in imaging quality and visual experience, and cannot meet the needs of users for high-quality virtual experiences. Summary of the Invention

[0004] Based on this, it is necessary to provide a VR eyepiece system to address the problems that the imaging quality and visual experience of existing VR devices are poor and cannot meet the needs of users.

[0005] A VR eyepiece system includes:

[0006] A lens assembly, the lens assembly includes a first lens, a second lens, a third lens, and a fourth lens coaxially arranged in sequence from the eyepiece side to the image side. The image side surface of the first lens is a plane, and both the eyepiece side surface and the image side surface of the first lens are spherical surfaces; the image side surface of the second lens is a convex surface, and both the eyepiece side surface and the image side surface of the second lens are spherical surfaces; the third lens has a negative optical power, the eyepiece side surface and the image side surface of the third lens are a concave surface and a convex surface respectively, and both the eyepiece side surface and the image side surface of the third lens are aspherical surfaces; both the eyepiece side surface and the image side surface of the fourth lens are aspherical surfaces;

[0007] A polarization reflective film, the polarization reflective film is attached to the image side surface of the first lens;

[0008] A quarter-wave plate, the quarter-wave plate is attached to the image side surface of the polarization reflective film;

[0009] A semi-transmissive semi-reflective film, the semi-transmissive semi-reflective film is attached to the image side surface of the third lens;

[0010] A display component, the display component is arranged on the image side surface of the fourth lens;

[0011] The VR eyepiece system satisfies the following relationship:

[0012] 1.35 < TTL·tan(SEMI - FOV) / IMGh < 1.6;

[0013] Wherein, TTL is the axial distance from the ocular side of the first lens to the display component, SEMI-FOV is the half field of view angle of the VR eyepiece system, and IMGh is half of the diagonal length of the effective pixel area on the image plane of the VR eyepiece system.

[0014] In one embodiment, the VR eyepiece system satisfies the following relational expression:

[0015] 1.35 < f / IMGh < 1.5;

[0016] Wherein, f is the effective focal length of the VR eyepiece system, and IMGh is half of the diagonal length of the effective pixel area on the image plane of the VR eyepiece system.

[0017] In one embodiment, the VR eyepiece system satisfies the following relational expression:

[0018] -2 < f1 / f2 < 2.5;

[0019] Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0020] In one embodiment, the VR eyepiece system satisfies the following relational expression:

[0021] -1 < f3 / f4 < 1.4;

[0022] Wherein, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

[0023] In one embodiment, the lens assembly further includes an adhesive layer having a refractive index, and the adhesive layer is disposed between the second lens and the third lens to glue the second lens and the third lens.

[0024] In one embodiment, the VR eyepiece system satisfies the following relational expression:

[0025] N polarization reflection film RP = N quarter-wave plate QWP = Ng;

[0026] Wherein, N polarization reflection film RP is the refractive index of the polarization reflection film, N quarter-wave plate QWP is the refractive index of the quarter-wave plate, and Ng is the refractive index of the adhesive layer.

[0027] In one embodiment, the VR eyepiece system satisfies the following relational expression:

[0028] 1.9 ≤ V2 / V3 < 2.6;

[0029] Wherein, V2 is the Abbe number of the second lens, and V3 is the Abbe number of the third lens.

[0030] In one embodiment, the VR eyepiece system satisfies the following relationship:

[0031] 2.1 < (CT2 + CTg + CT3) / CT1 < 5.6;

[0032] Wherein, CT1 is the central thickness of the first lens, CT2 is the central thickness of the second lens, CTg is the central thickness of the adhesive layer, and CT3 is the central thickness of the third lens.

[0033] In one embodiment, the VR eyepiece system satisfies the following relationship:

[0034] 0.6 < (CT4·N4) / BFL < 3.7;

[0035] Wherein, CT4 is the central thickness of the fourth lens, N4 is the refractive index of the fourth lens, and BFL is the on-axis distance from the image side of the fourth lens to the display screen.

[0036] In one embodiment, the VR eyepiece system satisfies the following relationship:

[0037] 3.3 < FNO / TAN(SEMI-FOV) < 4.1;

[0038] Wherein, SEMI-FOV is the half field of view angle of the VR eyepiece system, and FNO is the numerical aperture of the VR eyepiece system.

[0039] In one embodiment, the VR eyepiece system satisfies the following relationship:

[0040] 0.75 < IMGh / DT42 < 0.95;

[0041] Wherein, IMGh is half of the diagonal length of the effective pixel area on the image plane of the VR eyepiece system, and DT42 is the effective radius of the image side of the fourth lens.

[0042] In one embodiment, the VR eyepiece system satisfies the following relationship:

[0043] 2.7 < DT11 / EPD < 3.3;

[0044] Wherein, DT11 is the effective radius of the ocular side of the first lens, and EPD is the entrance pupil diameter of the VR eyepiece system.

[0045] In one embodiment, the VR eyepiece system satisfies the following relationship:

[0046] 1.1 ≤ TD / ED < 1.35;

[0047] Among them, TD is the on-axis distance from the ocular side of the first lens to the image side of the fourth lens, and ED is the on-axis distance from the human eye to the ocular side of the first lens.

[0048] By designing the ratio relationship between multiple key parameters, the VR eyepiece system of the present application can optimize the imaging quality, provide a comfortable visual experience, and reduce the eye fatigue of users during long-term use.

[0049] By attaching a polarization reflection surface and a quarter-wave plate to the image side of the first lens, the VR eyepiece system of the present application helps to control the propagation direction and polarization state of light, improve the display effect and reduce glare. At the same time, it can reduce the total length of the optical system, and reduce the volume and mass of the VR eyepiece system. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1A is a schematic optical path diagram of the VR eyepiece system according to the first embodiment of the present application;

[0051] Figure 1B shows the axial chromatic aberration curve of the VR eyepiece system according to the first embodiment of the present application;

[0052] Figure 1C shows the astigmatism curve of the VR eyepiece system according to the first embodiment of the present application;

[0053] Figure 1D shows the distortion curve of the VR eyepiece system according to the first embodiment of the present application;

[0054] Figure 1E shows the MTF diagram of the VR eyepiece system according to the first embodiment of the present application;

[0055] Figure 2A is a schematic optical path diagram of the VR eyepiece system according to the second embodiment of the present application;

[0056] Figure 2B shows the axial chromatic aberration curve of the VR eyepiece system according to the second embodiment of the present application;

[0057] Figure 2C shows the astigmatism curve of the VR eyepiece system according to the second embodiment of the present application;

[0058] Figure 2D shows the distortion curve of the VR eyepiece system according to the second embodiment of the present application;

[0059] Figure 2E shows the MTF diagram of the VR eyepiece system according to the second embodiment of the present application;

[0060] Figure 3AOptical path schematic diagram of the VR eyepiece system according to the third embodiment of the present application;

[0061] Figure 3B Shows the axial chromatic aberration curve of the VR eyepiece system according to the above-mentioned third embodiment of the present application;

[0062] Figure 3C Shows the astigmatism curve of the VR eyepiece system according to the above-mentioned third embodiment of the present application;

[0063] Figure 3D Shows the distortion curve of the VR eyepiece system according to the above-mentioned third embodiment of the present application;

[0064] Figure 3E Shows the MTF diagram of the VR eyepiece system according to the above-mentioned third embodiment of the present application;

[0065] Figure 4A Optical path schematic diagram of the VR eyepiece system according to the fourth embodiment of the present application;

[0066] Figure 4B Shows the axial chromatic aberration curve of the VR eyepiece system according to the above-mentioned fourth embodiment of the present application;

[0067] Figure 4C Shows the astigmatism curve of the VR eyepiece system according to the above-mentioned fourth embodiment of the present application;

[0068] Figure 4D Shows the distortion curve of the VR eyepiece system according to the above-mentioned fourth embodiment of the present application;

[0069] Figure 4E Shows the MTF diagram of the VR eyepiece system according to the above-mentioned fourth embodiment of the present application;

[0070] Figure 5A Optical path schematic diagram of the VR eyepiece system according to the fifth embodiment of the present application;

[0071] Figure 5B Shows the axial chromatic aberration curve of the VR eyepiece system according to the above-mentioned fifth embodiment of the present application;

[0072] Figure 5C Shows the astigmatism curve of the VR eyepiece system according to the above-mentioned fifth embodiment of the present application;

[0073] Figure 5D Shows the distortion curve of the VR eyepiece system according to the above-mentioned fifth embodiment of the present application;

[0074] Figure 5E Shows the MTF diagram of the VR eyepiece system according to the above-mentioned fifth embodiment of the present application.

[0075] Reference numerals: 10, display component; E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; RP, polarization reflection film; QWP, quarter-wave plate. Detailed implementation manners

[0076] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0077] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0078] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0079] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0081] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0082] Based on this, in order to improve the imaging quality and visual experience of VR devices. The present application provides a VR eyepiece system, which considers the ratio relationship between multiple key parameters in the optical design, can optimize the imaging quality, and enhance the visual experience.

[0083] Specifically, the VR eyepiece system of the present application may include: a lens assembly, a polarization reflection film, a quarter-wave plate, a semi-transmissive and semi-reflective film, and a display assembly. The lens assembly includes a first lens, a second lens, a third lens, and a fourth lens coaxially arranged in sequence from the eye side to the image side. The image side surface of the first lens is a plane, and the eye side surface and the image side surface of the first lens are both spherical surfaces; the image side surface of the second lens is a convex surface, and the eye side surface and the image side surface of the second lens are both spherical surfaces; the third lens has a negative optical power, the eye side surface and the image side surface of the third lens are concave and convex surfaces respectively, and the eye side surface and the image side surface of the third lens are both aspherical surfaces; the eye side surface and the image side surface of the fourth lens are both aspherical surfaces. The polarization reflection film is attached to the first lens and is used to transmit P light and reflect S light or transmit S light and reflect P light. The quarter-wave plate is attached to the image side surface of the polarization reflection surface. The semi-transmissive and semi-reflective film is attached to the image side surface of the third lens. The display assembly is disposed on the image side of the fourth lens and is used to emit circularly polarized light.

[0084] It can be understood that the circularly polarized light emitted by the display component passes through the fourth lens, passes through the semi-transmissive semi-reflective film on the image side of the third lens, loses half of its energy and passes through the third lens and the fourth lens. After passing through the quarter-wave plate on the image side of the first lens, it is converted into linearly polarized light (P light or S light). After reaching the polarization reflection film, it is reflected, passes through the second lens and the third lens again, reaches the semi-reflective semi-transmissive component on the image side of the third lens, and part of the light is reflected and enters the human eye successively through the third lens, the second lens, the quarter-wave plate, the polarization reflection film, and the first lens. In this way, by attaching the polarization reflection surface and the quarter-wave plate on the image side of the first lens, it helps to control the propagation direction and polarization state of the light, improve the display effect and reduce glare, while being able to reduce the total length of the optical system, and reduce the volume and mass of the VR eyepiece system. Generally speaking, the VR eyepiece system of the present application achieves excellent optical performance and a comfortable visual experience through a carefully designed lens configuration and surface treatment, providing users with an immersive virtual reality experience.

[0085] The VR eyepiece system of the present application satisfies the following relationship: 1.35 < TTL·tan(SEMI-FOV) / IMGh < 1.6; where TTL is the axial distance from the ocular side of the first lens to the display component, SEMI-FOV is the half field of view angle of the VR eyepiece system, and IMGh is half of the diagonal length of the effective pixel area on the image plane of the VR eyepiece system. Designing the VR eyepiece system according to this relationship can ensure that the propagation path and display effect of the light are within a certain range in the lens assembly, so as to ensure that users can obtain a relatively real and comfortable virtual reality experience.

[0086] Optionally, in some embodiments, the VR eyepiece system of the present application satisfies the following relationship: 1.35 < f / IMGh < 1.5; where f is the effective focal length of the VR eyepiece system, and IMGh is half of the diagonal length of the effective pixel area on the image plane of the VR eyepiece system. Designing the VR eyepiece system according to this relationship can achieve the limitation of the focal length and the pixel area size in the optical system design. By controlling the parameters of the VR eyepiece system within the above range, the performance in aspects such as improving image clarity and reducing user eye fatigue can be improved. In this way, a better visual experience can be provided for users, enabling users to obtain a clearer and more comfortable image effect when using the VR device. It can effectively balance the relationship between the focal length and the pixel area size, thereby improving the performance of the entire system and the user experience.

[0087] Optionally, in some embodiments, the VR eyepiece system of the present application satisfies the following relationship: -2 < f1 / f2 < 2.5; where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens. By designing the VR eyepiece system according to this relationship and controlling the focal length ratio of the first lens and the second lens, the imaging quality can be improved, the light focusing ability can be enhanced, and the distortion can be reduced, so as to optimize the performance of the optical system.

[0088] Optionally, in some embodiments, the VR eyepiece system of the present application satisfies the following relationship: -1 < f3 / f4 < 1.4; where f3 is the effective focal length of the third lens and f4 is the effective focal length of the fourth lens. By designing the VR eyepiece system according to this relationship and controlling the focal length ratio of the third lens and the fourth lens, the imaging quality can be improved, the light focusing ability can be enhanced, and the distortion can be reduced, so as to optimize the performance of the optical system.

[0089] Optionally, in some embodiments, the lens assembly further includes an adhesive layer with a refractive index, and the adhesive layer is disposed between the second lens and the third lens to glue the second lens and the third lens. In other words, the second lens and the third lens adopt a glued structure. This can avoid total reflection and scattering caused by the air gap between the lenses. By adjusting the refractive index between the second lens and the third lens, an achromatic lens group can be formed to correct chromatic aberration. In addition, by integrating the second lens and the third lens to form an integral structure, the system stability and durability can be improved, ensuring the long-term stable operation of the system. It can also simplify the assembly process, maintain the consistency of system performance, and reduce costs.

[0090] Optionally, in some embodiments, the quarter-wave plate, the polarization reflection film, and the adhesive layer all have a certain thickness. The quarter-wave plate can precisely control the phase of the light wave, causing the light passing through the quarter-wave plate to undergo a specific polarization state change, which helps to reduce interference and stray light in the image. The polarization reflection film can selectively absorb or reflect light waves in a specific direction, improving the polarization efficiency of the light, thereby enhancing the contrast and clarity of the image. With such settings, by precisely controlling the thicknesses of the quarter-wave plate, the polarization reflection film, and the adhesive layer, the film pasting and gluing difficulties can be reduced, the structural strength of the lens group can be enhanced, and the stability of the system can be improved.

[0091] Preferably, in some embodiments, the VR eyepiece system of the present application satisfies the following relationship: refractive index of N-polarization reflective film RP = refractive index of N-quarter wave plate QWP = refractive index of adhesive layer Ng; where the refractive index of N-polarization reflective film RP is the refractive index of the polarization reflective film, the refractive index of N-quarter wave plate QWP is the refractive index of the quarter wave plate, and Ng is the refractive index of the adhesive layer. By controlling the refractive index of the polarization reflective film to be equal to the refractive index of the quarter wave plate, the reflectivity between the film layers can be reduced. By controlling the refractive index of the adhesive layer to be equal to the refractive indices of the polarization reflective film and the quarter wave plate, the reflectivity between the second lens and the third lens can be avoided, achieving the purpose of reducing ghost images due to less light.

[0092] Preferably, in some embodiments, the VR eyepiece system of the present application satisfies the following relationship: 1.9 ≤ V2 / V3 < 2.6; where V2 is the Abbe number of the second lens and V3 is the Abbe number of the third lens. Designing the VR eyepiece system according to this relationship makes the imaging of the lens combination composed of the second lens and the third lens more consistent at different wavelengths. Within the given range of V2 / V3, the lens combination may have a better chromatic aberration correction effect. Glued lenses can reduce spherical aberration and chromatic aberration, thereby improving the clarity of imaging.

[0093] Preferably, in some embodiments, the VR eyepiece system of the present application satisfies the following relationship: 2.1 < (CT2 + CTg + CT3) / CT1 < 5.6; where CT1 is the central thickness of the first lens, CT2 is the central thickness of the second lens, CTg is the central thickness of the adhesive layer, and CT3 is the central thickness of the third lens. Designing the VR eyepiece system according to this relationship can control the total thickness and volume of the VR lens, which helps to design a more lightweight and portable head-mounted device, improving the convenience of users to carry and wear. By controlling the central thickness, the difficulty and cost of the film pasting process can be reduced, ensuring the performance of the optical system after film pasting.

[0094] Preferably, in some embodiments, the VR eyepiece system of the present application satisfies the following relationship: 0.6 < (CT4·N4) / BFL < 3.7; where CT4 is the central thickness of the fourth lens, N4 is the refractive index of the fourth lens, and BFL is the axial distance from the image side of the fourth lens to the display screen. Designing the VR eyepiece system according to this relationship, by controlling the ratio between the central thickness CT4, the refractive index N4 of the fourth lens, and the axial distance BFL from the image side to the display screen to be between 0.6 and 3.7, can help optimize the design of the optical system and ensure that the propagation and focusing effects of light in the fourth lens are within a reasonable range.

[0095] Optionally, in some embodiments, the ratio of the numerical aperture FNO to the semi-field of view SEMI-FOV of the VR eyepiece system reflects the light propagation and collection efficiency. For a virtual reality system, the range of this ratio can affect the light transmission performance and image quality of the system. The VR eyepiece system of the present application satisfies the following relationship: 3.3 < FNO / TAN(SEMI-FOV) < 4.1; where SEMI-FOV is the semi-field of view of the VR eyepiece system, and FNO is the numerical aperture of the VR eyepiece system. By designing the VR eyepiece system according to this relationship, with the ratio of the numerical aperture FNO to the semi-field of view SEMI-FOV of the VR eyepiece system between 3.3 and 4.1, the light transmission performance and image quality of the system can be improved.

[0096] Optionally, in some embodiments, by comprehensively considering the above conditional formula, the VR eyepiece system of the present application needs to consider the ratio between the size of the pixel area and the effective radius of the fourth lens in the design of the fourth lens. The VR eyepiece system of the present application satisfies the following relationship: 0.75 < IMGh / DT42 < 0.95; where IMGh is half of the diagonal length of the effective pixel area on the image plane of the VR eyepiece system, and DT42 is the effective radius of the image side of the fourth lens. By reasonably controlling this ratio, the pixel resolution and image quality of the system can be optimized, and the visual experience of the user in the virtual reality environment can be improved.

[0097] Optionally, in some embodiments, considering that the VR eyepiece system of the present application needs to obtain an appropriate ratio between the effective radius of the ocular side of the first lens and the entrance pupil diameter during design. The VR eyepiece system of the present application satisfies the following relationship: 2.7 < DT11 / EPD < 3.3; where DT11 is the effective radius of the ocular side of the first lens, and EPD is the entrance pupil diameter of the VR eyepiece system. By reasonably controlling this ratio, the optical performance of the system can be optimized, the clarity and vividness of the image can be improved, and thus the virtual reality experience of the user can be enhanced.

[0098] Optionally, in some embodiments, when designing the VR eyepiece system of the present application, it is necessary to consider the ratio between the axial distance from the ocular side of the first lens to the image side of the fourth lens and the axial distance from the human eye to the ocular side of the first lens. For a virtual reality system, the range of this ratio can affect the visual comfort and experience of the user. The VR eyepiece system of the present application satisfies the following relationship: 1.1 ≤ TD / ED < 1.35; where TD is the axial distance from the ocular side of the first lens to the image side of the fourth lens, and ED is the axial distance from the human eye to the ocular side of the first lens. Designing the VR eyepiece system according to this relationship, by controlling the axial distance from the ocular side of the first lens to the image side of the fourth lens within a certain range, on the one hand, it can ensure that the overall optical length is not too large, avoiding the VR system from being too large in volume and weight, nor will it cause the overall length to be too small to meet the performance requirements of the optical system; on the other hand, by controlling the axial distance from the human eye to the ocular side of the first lens within a certain range, and requiring the ratio between the axial distance TD from the ocular side of the first lens to the image side of the fourth lens and the axial distance ED from the human eye to the ocular side of the first lens to be 1.1, it can optimize the optical design of the system, improve the vividness of the image and the comfort of the user, thereby enhancing the virtual reality experience.

[0099] The following further describes specific embodiments of the VR eyepiece system applicable to the above embodiments with reference to the accompanying drawings.

[0100] As Figure 1A shown, in the first embodiment of the present application, the optical camera lens includes a lens assembly, a polarization reflection film RP, a quarter-wave plate QWP, a semi-transmissive semi-reflective film, and a display assembly 10. The lens assembly includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 coaxially arranged in sequence from the ocular side to the image side. The polarization reflection film RP is attached to the first lens E1. The quarter-wave plate QWP is attached to the image side of the polarization reflection surface. The semi-transmissive semi-reflective film is attached to the third lens E3. The display assembly 10 is arranged on the image side of the fourth lens E4.

[0101] The ocular side and the side surface of the first lens E1 are convex and flat respectively, and the ocular side and the image side of the first lens E1 are both spherical surfaces; the ocular side and the image side of the second lens E2 are flat and convex respectively, and the ocular side and the image side of the second lens E2 are both spherical surfaces; the third lens E3 has a negative optical power, the ocular side and the image side of the third lens E3 are concave and convex respectively, and the ocular side and the image side of the third lens E3 are both aspherical surfaces; the ocular side and the image side of the fourth lens E4 are both convex, and the ocular side and the image side of the fourth lens E4 are both aspherical surfaces.

[0102] Table 1 shows the basic parameter table of the lenses of the VR eyepiece system in the first embodiment, where the units of the radius of curvature and the thickness are both millimeters (mm).

[0103] Table 1: Basic Parameter Table of Lenses of the VR Eyepiece System in the First Embodiment

[0104]

[0105] In the first embodiment, the ocular side and the image side of the third lens E3 and the fourth lens E4 are both aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0106]

[0107] where x is the distance from the vertex of the aspherical surface to the aspherical surface at the position with a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 gives the higher-order term coefficients A4, A6, and A8 of each aspherical mirror surface S7 - S10 in the first embodiment.

[0108] Table 2: Conic Coefficient Table of Aspherical Mirror Surfaces of the VR Eyepiece System in the First Embodiment

[0109]

[0110] Figure 1B Shows the axial chromatic aberration curve of the VR eyepiece system in the first embodiment, Figure 1C Shows the astigmatism curve of the VR eyepiece system in the first embodiment. Figure 1D Shows the distortion curve of the VR eyepiece system in the first embodiment. Figure 1E Shows the MTF diagram of the VR eyepiece system in the first embodiment. According to Figures 1B to 1E it can be seen that the VR eyepiece system given in the first embodiment has good imaging quality.

[0111] As Figure 2A shown, in the second embodiment of the present application, the optical camera lens includes a lens assembly, a polarization reflection film RP, a quarter-wave plate QWP, a semi-transmissive and semi-reflective film, and a display component 10. The lens assembly includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 coaxially arranged in sequence from the ocular side to the image side. The polarization reflection film RP is attached to the first lens E1. The quarter-wave plate QWP is attached to the image side of the polarization reflection surface. The semi-transmissive and semi-reflective film is attached to the third lens E3. The display component 10 is arranged on the image side of the fourth lens E4.

[0112] The ocular side and the lateral side of the first lens E1 are convex and flat respectively, and both the ocular side and the image side of the first lens E1 are spherical surfaces; both the ocular side and the image side of the second lens E2 are convex, and both the ocular side and the image side of the second lens E2 are spherical surfaces; the third lens E3 has a negative optical power, the ocular side and the image side of the third lens E3 are concave and convex respectively, and both the ocular side and the image side of the third lens E3 are aspherical surfaces; both the ocular side and the image side of the fourth lens E4 are concave, and both the ocular side and the image side of the fourth lens E4 are aspherical surfaces.

[0113] Table 3 shows the basic parameter table of the lenses of the VR eyepiece system of the second embodiment, where the units of the radius of curvature and the thickness are both millimeters (mm).

[0114] Table 3: Basic Parameter Table of the Lenses of the VR Eyepiece System of the Second Embodiment

[0115]

[0116] In the second embodiment, both the ocular side and the image side of the third lens E3 and the fourth lens E4 are aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0117]

[0118] where x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is along the optical axis at a position with a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 4 gives the higher-order coefficients A4, A6, and A8 that can be used for the aspherical mirrors S7 - S10 in the second embodiment.

[0119] Table 4: Conic Coefficient Table of the Aspherical Mirrors of the VR Eyepiece System of the Second Embodiment

[0120]

[0121] Figure 2B shows the axial chromatic aberration curve of the VR eyepiece system of the second embodiment, Figure 2C shows the astigmatism curve of the VR eyepiece system of the second embodiment. Figure 2D shows the distortion curve of the VR eyepiece system of the second embodiment. Figure 2E shows the MTF graph of the VR eyepiece system of the second embodiment. According to Figures 2B to 2E it can be seen that the VR eyepiece system given in the second embodiment has good imaging quality.

[0122] As Figure 3AAs shown, in the third embodiment of the present application, the optical camera lens includes a lens assembly, a polarization reflection film RP, a quarter-wave plate QWP, a semi-transmissive and semi-reflective film, and a display component 10. The lens assembly includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 coaxially arranged in sequence from the eye side to the image side. The polarization reflection film RP is attached to the first lens E1. The quarter-wave plate QWP is attached to the image side of the polarization reflection surface. The semi-transmissive and semi-reflective film is attached to the third lens E3. The display component 10 is arranged on the image side of the fourth lens E4.

[0123] The eye side and the side surface of the first lens E1 are convex and flat respectively, and the eye side and the image side of the first lens E1 are both spherical surfaces; the eye side and the image side of the second lens E2 are both convex, and the eye side and the image side of the second lens E2 are both spherical surfaces; the third lens E3 has a negative optical power, the eye side and the image side of the third lens E3 are concave and convex respectively, and the eye side and the image side of the third lens E3 are both aspherical surfaces; the eye side and the image side of the fourth lens E4 are convex and concave respectively, and the eye side and the image side of the fourth lens E4 are both aspherical surfaces.

[0124] Table 5 shows the basic parameter table of the lenses of the VR eyepiece system in the third embodiment, where the units of the radius of curvature and the thickness are both millimeters (mm).

[0125] Table 5: Basic Parameter Table of the Lenses of the VR Eyepiece System in the Third Embodiment

[0126]

[0127] In the third embodiment, the eye side and the image side of the third lens E3 and the fourth lens E4 are both aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0128]

[0129] Where x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 5 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 6 gives the higher-order term coefficients A4, A6, and A8 that can be used for the aspherical mirrors S7 - S10 in the third embodiment.

[0130] Table 6: Conic Coefficient Table of the Aspherical Mirrors of the VR Eyepiece System in the Third Embodiment

[0131]

[0132] Figure 3BShows the axial chromatic aberration curve of the VR eyepiece system of the third embodiment. Figure 3C Shows the astigmatism curve of the VR eyepiece system of the third embodiment. Figure 3D Shows the distortion curve of the VR eyepiece system of the third embodiment. Figure 3E Shows the MTF diagram of the VR eyepiece system of the third embodiment. According to Figures 3B to 3E It can be seen that the VR eyepiece system given in the third embodiment has good imaging quality.

[0133] As Figure 4A Shown, in the fourth embodiment of the present application, the optical camera lens includes a lens assembly, a polarization reflection film RP, a quarter-wave plate QWP, a semi-transmissive and semi-reflective film, and a display assembly 10. The lens assembly includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 that are coaxially arranged in sequence from the eyepiece side to the image side. The polarization reflection film RP is attached to the first lens E1. The quarter-wave plate QWP is attached to the image side of the polarization reflection surface. The semi-transmissive and semi-reflective film is attached to the third lens E3. The display assembly 10 is disposed on the image side of the fourth lens E4.

[0134] The eyepiece side and the side surface of the first lens E1 are convex and flat respectively, and the eyepiece side and the image side of the first lens E1 are both spherical surfaces; the eyepiece side and the image side of the second lens E2 are concave and convex respectively, and the eyepiece side and the image side of the second lens E2 are both spherical surfaces; the third lens E3 has a negative optical power, the eyepiece side and the image side of the third lens E3 are concave and convex respectively, and the eyepiece side and the image side of the third lens E3 are both aspherical surfaces; the eyepiece side and the image side of the fourth lens E4 are both convex, and the eyepiece side and the image side of the fourth lens E4 are both aspherical surfaces.

[0135] Table 7 shows the basic parameter table of the lenses of the VR eyepiece system of the fourth embodiment, where the units of the radius of curvature and the thickness are both millimeters (mm).

[0136] Table 7: Basic Parameter Table of the Lenses of the VR Eyepiece System of the Fourth Embodiment

[0137]

[0138] In the fourth embodiment, the eyepiece side and the image side of the third lens E3 and the fourth lens E4 are both aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but is not limited to, the following aspherical formula:

[0139]

[0140] Wherein, x is the distance from the vertex of the aspheric surface when the aspheric surface is at a position with a height of h along the optical axis; the sagittal height: c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 7 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 8 gives the higher-order term coefficients A4, A6, and A8 of each aspheric mirror surface S7 - S10 in the fourth embodiment.

[0141] Table 8: Table of conic coefficients of aspheric mirror surfaces of the VR eyepiece system in the fourth embodiment

[0142]

[0143] Figure 4B Shows the axial chromatic aberration curve of the VR eyepiece system in the fourth embodiment, Figure 4C Shows the astigmatism curve of the VR eyepiece system in the fourth embodiment. Figure 4D Shows the distortion curve of the VR eyepiece system in the fourth embodiment. Figure 4E Shows the MTF diagram of the VR eyepiece system in the fourth embodiment. According to Figures 4B to 4E It can be seen that the VR eyepiece system given in the fourth embodiment has good imaging quality.

[0144] As Figure 5A Shown, in the fifth embodiment of the present application, the optical camera lens includes a lens assembly, a polarization reflection film RP, a quarter-wave plate QWP, a semi-transmissive and semi-reflective film, and a display assembly 10. The lens assembly includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 coaxially arranged in sequence from the eyepiece side to the image side. The polarization reflection film RP is attached to the first lens E1. The quarter-wave plate QWP is attached to the image side of the polarization reflection surface. The semi-transmissive and semi-reflective film is attached to the third lens E3. The display assembly 10 is arranged on the image side of the fourth lens E4.

[0145] The eyepiece side and the side surface of the first lens E1 are respectively concave and flat, and the eyepiece side and the image side of the first lens E1 are both spherical surfaces; the eyepiece side and the image side of the second lens E2 are both convex, and the eyepiece side and the image side of the second lens E2 are both spherical surfaces; the third lens E3 has a negative optical power, the eyepiece side and the image side of the third lens E3 are respectively concave and convex, and the eyepiece side and the image side of the third lens E3 are both aspheric surfaces; the eyepiece side and the image side of the fourth lens E4 are both convex, and the eyepiece side and the image side of the fourth lens E4 are both aspheric surfaces.

[0146] Table 9 shows the basic parameter table of the lenses of the VR eyepiece system in the fifth embodiment, where the units of the radius of curvature and the thickness are both millimeters (mm).

[0147] Table 9: Basic Parameter Table of the Lenses of the VR Eyepiece System of the Fifth Embodiment

[0148]

[0149] In the fifth embodiment, both the ocular side and the image side of the third lens E3 and the fourth lens E4 are aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0150]

[0151] where x is the sagitta, which is the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 9 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 10 gives the higher-order coefficients A4, A6, and A8 that can be used for the aspherical surfaces S7 - S10 in the fifth embodiment.

[0152] Table 10: Conic Coefficient Table of the Aspherical Surfaces of the VR Eyepiece System of the Fifth Embodiment

[0153]

[0154] Figure 5B Shows the axial chromatic aberration curve of the VR eyepiece system of the fifth embodiment, Figure 5C Shows the astigmatism curve of the VR eyepiece system of the fifth embodiment. Figure 5D Shows the distortion curve of the VR eyepiece system of the fifth embodiment. Figure 5E Shows the MTF graph of the VR eyepiece system of the fifth embodiment. According to Figures 5B to 5E it can be known that the VR eyepiece system given in the fifth embodiment has good imaging quality.

[0155] The optical parameters of the VR eyepiece systems of the first to fifth embodiments are shown in the following table.

[0156]

[0157] The VR eyepiece systems of the first to fifth embodiments satisfy the following relationships.

[0158]

[0159] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered to be within the scope described in this specification.

[0160] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A VR eyepiece system, characterized in that: include: A lens assembly, the lens assembly is composed of a first lens, a second lens, a third lens and a fourth lens coaxially arranged in sequence from the eye side to the image side, the image side surface of the first lens is a plane, and the eye side surface and the image side surface of the first lens are both spherical surfaces; the image side surface of the second lens is a convex surface, and the eye side surface and the image side surface of the second lens are both spherical surfaces; the third lens has negative optical power, the eye side surface and the image side surface of the third lens are concave and convex respectively, and the eye side surface and the image side surface of the third lens are both aspherical surfaces; the eye side surface and the image side surface of the fourth lens are both aspherical surfaces; a polarizing reflective film, the polarizing reflective film being attached to the image side surface of the first lens; A quarter wave plate, the quarter wave plate being attached to the image side surface of the polarizing reflective film; A semi-transparent and semi-reflective film, wherein the semi-transparent and semi-reflective film is attached to the image side surface of the third lens; A display component, the display component is arranged on the image side surface of the fourth lens; The VR eyepiece system satisfies the following relationship: 1.35 <TTL·tan(SEMI-FOV) / IMGh<1.6; Among them, TTL is the on-axis distance from the eye side of the first lens to the display component, SEMI-FOV is the half field of view angle of the VR eyepiece system, and IMGh is half of the diagonal length of the effective pixel area on the image plane of the VR eyepiece system.

2. The VR eyepiece system according to claim 1, characterized in that: The VR eyepiece system satisfies the following relationship: 1.35 <f / IMGh<1.5; Among them, f is the effective focal length of the VR eyepiece system, and IMGh is half of the diagonal length of the effective pixel area on the image plane of the VR eyepiece system.

3. The VR eyepiece system according to claim 1, characterized in that: The VR eyepiece system satisfies the following relationship: -2 <f1 / f2<2.5; Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

4. The VR eyepiece system according to claim 1, characterized in that: The VR eyepiece system satisfies the following relationship: -1 <f3 / f4<1.4; Wherein, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

5. The VR eyepiece system according to any one of claims 1 to 4, characterized in that: The lens assembly further includes a glue layer having a refractive index, and the glue layer is disposed between the second lens and the third lens to glue the second lens and the third lens together.

6. The VR eyepiece system according to claim 5, characterized in that: The VR eyepiece system satisfies the following relationship: N polarization reflective film RP = N quarter wave plate QWP = Ng; Among them, N polarized reflective film RP is the refractive index of the polarized reflective film, N quarter wave plate QWP is the refractive index of the quarter wave plate, and Ng is the refractive index of the adhesive layer.

7. The VR eyepiece system according to claim 5, characterized in that: The VR eyepiece system satisfies the following relationship: 1.9≤V2 / V3<2.6; Wherein, V2 is the Abbe number of the second lens, and V3 is the Abbe number of the third lens.

8. The VR eyepiece system according to claim 5, characterized in that: The VR eyepiece system satisfies the following relationship: 2.1<(CT2+CTg+CT3) / CT1<5.6; Among them, CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, CTg is the center thickness of the glue layer, and CT3 is the center thickness of the third lens.

9. The VR eyepiece system according to any one of claims 1 to 4, characterized in that: The VR eyepiece system satisfies the following relationship: 0.6<(CT4·N4) / BFL<3.7; Wherein, CT4 is the center thickness of the fourth lens, N4 is the refractive index of the fourth lens, and BFL is the axial distance from the image side of the fourth lens to the display screen.

10. The VR eyepiece system according to any one of claims 1 to 4, characterized in that: The VR eyepiece system satisfies the following relationship: 3.3 <FNO / TAN(SEMI-FOV)<4.1; Among them, SEMI-FOV is the half field of view angle of the VR eyepiece system, and FNO is the numerical aperture of the VR eyepiece system.

11. The VR eyepiece system according to any one of claims 1 to 4, characterized in that: The VR eyepiece system satisfies the following relationship: 0.75 <IMGh / DT42<0.95; Among them, IMGh is half of the diagonal length of the effective pixel area on the image plane of the VR eyepiece system, and DT42 is the effective radius of the image side surface of the fourth lens.

12. The VR eyepiece system according to any one of claims 1 to 4, characterized in that: The VR eyepiece system satisfies the following relationship: 2.7 <DT11 / EPD<3.3; Among them, DT11 is the effective radius of the eye side of the first lens, and EPD is the entrance pupil diameter of the VR eyepiece system.

13. The VR eyepiece system according to any one of claims 1 to 4, characterized in that: The VR eyepiece system satisfies the following relationship: 1.1≤TD / ED<1.35; Wherein, TD is the on-axis distance from the eye side of the first lens to the image side of the fourth lens, and ED is the on-axis distance from the human eye to the eye side of the first lens.

Images