A near-eye display lens

Abstract

The present invention discloses a near-eye display lens, which sequentially includes, from the inside to the outside along the optical axis: a first lens with positive optical power; a second lens with optical power, the inner side surface of which is convex; a third lens with optical power, the outer side surface of which is convex; and a fourth lens with positive optical power; the material of at least one lens among the first lens to the fourth lens is glass; wherein, the effective focal length f of the near-eye display lens, the effective focal length f1 of the first lens, and the effective focal length f4 of the fourth lens satisfy: 0.4 < f / f1 + f / f4 < 1.5. The near-eye display lens provided by the present invention takes into account both the optical performance and the volume and weight of the lens, compresses the volume of the lens and reduces the weight of the lens while ensuring high image quality, bringing a better visual experience and comfort to users, and has great application prospects.

Description

Technical Field

[0001] The invention belongs to the field of optical imaging, and in particular relates to a near-eye display lens comprising four lenses. Background Art

[0002] In recent years, terminal manufacturers at home and abroad, such as ByteDance and Facebook, have once again focused their attention on virtual reality products (VR). As one of the core components of VR products, the near-eye display lens determines the optical performance of VR products and the user's wearing experience. The near-eye display lens connects the screen device and the pupil of the human eye, projecting the image displayed on the screen into the glasses to achieve the immersive and interactive application characteristics of VR products. Optical performance is one of the key indicators of near-eye display lenses, which directly determines the clarity of the picture. High-definition pictures can bring better visual experience effects. Volume and weight are one of the key indicators of near-eye display lenses, which determines the user's wearing experience. Lightweight and compact lenses can reduce user discomfort.

[0003] Therefore, there is a need for a near-eye display lens that takes into account both optical performance and volume and weight, which can compress the volume and reduce the weight of the lens while ensuring high image quality, thus giving users a better visual experience and comfort. Summary of the invention

[0004] The present invention aims to provide a near-eye display lens composed of four lenses, taking into account both the optical performance and the volume and weight of the lens, while ensuring high image quality, compressing the volume of the lens and reducing the weight of the lens, thereby bringing users a better visual experience and comfort.

[0005] One aspect of the present invention provides a near-eye display lens, which includes, from the inside to the outside along the optical axis, a first lens with positive optical power; a second lens with optical power, whose inner side surface is convex; a third lens with optical power, whose outer side surface is convex; and a fourth lens with positive optical power. At least one of the first lens to the fourth lens is made of glass.

[0006] Among them, the effective focal length f of the near-eye display lens, the effective focal length f1 of the first lens, and the effective focal length f4 of the fourth lens satisfy: 0.4 <f / f1+f / f4<1.5。

[0007] According to one embodiment of the present invention, a distance T23 from the outer side of the second lens to the inner side of the third lens on the optical axis and a distance T34 from the outer side of the third lens to the inner side of the fourth lens on the optical axis satisfy: log(T23 / T34)<2.

[0008] According to one embodiment of the present invention, the numerical aperture Fno of the near-eye display lens, the Abbe number v2 of the second lens material, and the Abbe number v4 of the fourth lens material satisfy: -1.3 <log(Fno / (v2+v4))<-1.1。

[0009] According to one embodiment of the present invention, the numerical aperture Fno of the near-eye display lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy: 2.5mm<(f4-f3) / Fno.

[0010] According to one embodiment of the present invention, the distance SL from the aperture to the display screen on the optical axis and the distance TD from the inner side of the first lens to the outer side of the fourth lens on the optical axis satisfy: 1.4 <SL / TD<2.2。

[0011] According to one embodiment of the present invention, the effective semi-aperture DT41 of the inner side of the fourth lens and the effective semi-aperture DT32 of the outer side of the third lens satisfy: 1 <DT41 / DT32<1.4。

[0012] According to one embodiment of the present invention, the effective semi-aperture DT42 of the outer side of the fourth lens and the center thickness CT4 of the fourth lens satisfy: 1.7 <DT42 / CT4<2.9。

[0013] According to one embodiment of the present invention, the edge thickness ET3 of the third lens and the center thickness CT3 of the third lens satisfy: 0.2 <ET3 / CT3<1.8。

[0014] According to one embodiment of the present invention, the center thickness CT1 of the first lens, the center thickness CT4 of the fourth lens, the Abbe number v1 of the first lens material, and the Abbe number v4 of the fourth lens material satisfy: 1.7<(v4+v1)×CT4 / (CT1×(v1-v4))<3.7.

[0015] According to one embodiment of the present invention, the curvature radius R3 of the inner side of the second lens, the curvature radius R6 of the outer side of the third lens, and half of the maximum field of view angle Semi-FOV of the near-eye display lens satisfy: 0.8<(R3-R6)×tan(Semi-FOV) / |(R3+R6)|<8.7.

[0016] According to one embodiment of the present invention, the effective focal length f4 of the fourth lens and the Abbe number v4 of the fourth lens material satisfy: 1.3 mm <f4 / v4。

[0017] Another aspect of the present invention provides a near-eye display lens, which includes, from the inside to the outside along the optical axis, a first lens with positive optical power; a second lens with optical power, whose inner side surface is convex; a third lens with optical power, whose outer side surface is convex; and a fourth lens with positive optical power. At least one of the first lens to the fourth lens is made of glass.

[0018] Among them, each lens is independent of each other, and there is an air gap between each lens on the optical axis; the distance SL from the aperture to the display screen on the optical axis and the distance TD from the inside of the first lens to the outside of the fourth lens on the optical axis satisfy: 1.4 <SL / TD<2.2。

[0019] Beneficial effects of the present invention:

[0020] The near-eye display lens provided by the present invention includes multiple lenses, such as the first lens to the fourth lens. The near-eye display lens of the present invention takes into account both the optical performance and the volume and weight of the lens, compresses the volume of the lens and reduces the weight of the lens while ensuring high image quality, brings users a better visual experience and comfort, and has great application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 Schematic diagram of the lens group structure of embodiment 1 of the near-eye display lens of the present invention;

[0023] Figure 2 axial chromatic aberration curve of the near-eye display lens embodiment 1 of the present invention;

[0024] Figure 3 Schematic diagram of the diffuse spots of the near-eye display lens embodiment 1 of the present invention;

[0025] Figure 4 Schematic diagram of the lens group structure of embodiment 2 of the near-eye display lens of the present invention;

[0026] Figure 5 axial chromatic aberration curve of the near-eye display lens embodiment 2 of the present invention;

[0027] Figure 6 Schematic diagram of the diffuse spots of the near-eye display lens embodiment 2 of the present invention;

[0028] Figure 7Schematic diagram of the lens group structure of embodiment 3 of the near-eye display lens of the present invention;

[0029] Figure 8 axial chromatic aberration curve of the near-eye display lens embodiment 3 of the present invention;

[0030] Fig. 9 Schematic diagram of the diffuse spots of the near-eye display lens embodiment 3 of the present invention;

[0031] Fig.10 Schematic diagram of the lens group structure of a near-eye display lens embodiment 4 of the present invention;

[0032] Fig.11 axial chromatic aberration curve of the near-eye display lens embodiment 4 of the present invention;

[0033] Fig.12 Schematic diagram of the diffuse spots of the near-eye display lens embodiment 4 of the present invention;

[0034] Fig.13 Schematic diagram of the lens group structure of embodiment 5 of the near-eye display lens of the present invention;

[0035] Fig.14 axial chromatic aberration curve of the near-eye display lens embodiment 5 of the present invention;

[0036] Fig.15 Schematic diagram of the diffuse spots of the near-eye display lens embodiment 5 of the present invention;

[0037] Fig.16 Schematic diagram of the lens group structure of embodiment 6 of the near-eye display lens of the present invention;

[0038] Fig.17 axial chromatic aberration curve of the near-eye display lens embodiment 6 of the present invention;

[0039] Fig.18 Schematic diagram of the diffuse spots of the near-eye display lens embodiment 6 of the present invention;

[0040] Fig.19 Schematic diagram of the lens group structure of embodiment 7 of the near-eye display lens of the present invention;

[0041] Fig. 20 axial chromatic aberration curve of the near-eye display lens embodiment 7 of the present invention;

[0042] Fig.21 Schematic diagram of the diffuse spots of the near-eye display lens embodiment 7 of the present invention. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0045] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0046] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0047] In the description of the present invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the inner side of the lens, and the surface of each lens closest to the imaging surface is called the outer side of the lens.

[0048] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal way unless explicitly defined in this article.

[0049] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention may be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0050] Exemplary Embodiment

[0051] The near-eye display lens of the exemplary embodiment of the present invention includes four lenses, which are sequentially arranged from the inner side to the outer side along the optical axis: a first lens, a second lens, a third lens, and a fourth lens. Among them, each lens is independent of each other, and there is an air gap between the lenses on the optical axis. The inner side is the side where the object to be photographed is located, and the outer side is the side where the imaging surface is located.

[0052] In this exemplary embodiment, the first lens has a positive optical power; the second lens may have a positive optical power or a negative optical power, and its inner surface is convex; the third lens may have a positive optical power or a negative optical power, and its outer surface is convex; the fourth lens has a positive optical power. The material of at least one of the first lens to the fourth lens is glass. When the above optical power and surface shape conditions are met, it is beneficial to reasonably distribute the optical power of the near-eye display lens and is conducive to the imaging system to balance and correct various aberrations.

[0053] In this exemplary embodiment, the condition formula satisfied by the effective focal length f of the near-eye display lens, the effective focal length f1 of the first lens, and the effective focal length f4 of the fourth lens is: 0.4 < f / f1 + f / f4 < 1.5. When the above effective focal length condition is met, the proportion of the refractive power of the first lens and the fourth lens in the near-eye display lens can be controlled, which is beneficial to reducing the volume and weight of the first lens and the fourth lens, realizing the miniaturization and light weight of the near-eye display lens, and is also conducive to the near-eye display lens to adapt to larger-size screen devices to obtain a good visual experience effect. More specifically, f, f1, and f4 satisfy: 0.6 ≤ f / f1 + f / f4 ≤ 1.3. For example, 0.61 ≤ f / f1 + f / f4 ≤ 1.27.

[0054] In this exemplary embodiment, the condition formula satisfied by the distance T23 on the optical axis from the outer side of the second lens to the inner side of the third lens and the distance T34 on the optical axis from the outer side of the third lens to the inner side of the fourth lens is: log(T23 / T34) < 2. When the above condition is met, the air gaps between the second lens, the third lens, and the fourth lens are restricted, which is beneficial to reducing the risk of ghosting caused by light reflection between the three lenses, and is also conducive to ensuring the compact arrangement of the three lenses to realize the miniaturization of the volume of the near-eye display lens. More specifically, T23 and T34 satisfy: 0.20 ≤ log(T23 / T34) ≤ 1.8. For example, 0.20 ≤ log(T23 / T34) ≤ 1.79.

[0055] In this exemplary embodiment, the conditional formula satisfied by the numerical aperture Fno of the near-eye display lens, the Abbe number v2 of the second lens material, and the Abbe number v4 of the fourth lens material is: -1.3 < log(Fno / (v2 + v4)) < -1.1. When the above conditions are met, while ensuring the numerical aperture of the near-eye display lens, the axial chromatic aberration of the near-eye display lens can be corrected to achieve a larger eye movement range and better color performance of the lens. More specifically, Fno, v2, and v4 satisfy: -1.28 ≤ log(Fno / (v2 + v4)) ≤ -1.2. For example, -1.26 ≤ log(Fno / (v2 + v4)) ≤ -1.21.

[0056] In this exemplary embodiment, the conditional formula satisfied by the numerical aperture Fno of the near-eye display lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens is: 2.5 mm < (f4 - f3) / Fno. When the above conditions are met, the refractive power of the third lens and the fourth lens is restricted, which is beneficial to reasonably allocate the proportion of the refractive power of each lens in the near-eye display lens. More specifically, Fno, f3, and f4 satisfy: 2.8 mm ≤ (f4 - f3) / Fno ≤ 138 mm. For example, 2.81 mm ≤ (f4 - f3) / Fno ≤ 137.58 mm.

[0057] In this exemplary embodiment, the conditional formula satisfied by the distance SL from the aperture stop to the display screen on the optical axis and the distance TD from the inner side of the first lens to the outer side of the fourth lens on the optical axis is: 1.4 < SL / TD < 2.2. When the above conditions are met, the overall volume of the near-eye display lens is controlled, which is beneficial to improving the portability and wearing experience of the end user. More specifically, SL and TD satisfy: 1.6 ≤ SL / TD ≤ 2. For example, 1.61 ≤ SL / TD ≤ 1.99.

[0058] In this exemplary embodiment, the conditional formula satisfied by the effective semi-aperture DT41 on the inner side of the fourth lens and the effective semi-aperture DT32 on the outer side of the third lens is: 1 < DT41 / DT32 < 1.4. When the above conditions are met, the aperture sizes of the adjacent surfaces of the third lens and the fourth lens are controlled, which is beneficial to reducing the risk of ghosting caused by light reflection at the edges of the third and fourth lenses, so as to improve the display clarity of the near-eye display lens. More specifically, DT41 and DT32 satisfy: 1.1 ≤ DT41 / DT32 ≤ 1.3. For example, 1.12 ≤ DT41 / DT32 ≤ 1.26.

[0059] In this exemplary embodiment, the conditional expression satisfied by the effective semi-aperture DT42 outside the fourth lens and the central thickness CT4 of the fourth lens is: 1.7 < DT42 / CT4 < 2.9. When the above conditions are met, the aperture size of the fourth lens is restricted, which is beneficial to reducing the volume and weight of the fourth lens and also beneficial to improving the processing and forming yield of the fourth lens. More specifically, DT42 and CT4 satisfy: 1.8 ≤ DT42 / CT4 ≤ 2.8. For example, 1.86 ≤ DT42 / CT4 ≤ 2.72.

[0060] In this exemplary embodiment, the conditional expression satisfied by the edge thickness ET3 of the third lens and the central thickness CT3 of the third lens is: 0.2 < ET3 / CT3 < 1.8. When the above conditions are met, the ratio of the edge thickness to the central thickness of the third lens is restricted, which is beneficial to improving the processing and forming yield of the third lens. More specifically, ET3 and CT3 satisfy: 0.3 ≤ ET3 / CT3 ≤ 1.75. For example, 0.35 ≤ ET3 / CT3 ≤ 1.73.

[0061] In this exemplary embodiment, the conditional expression satisfied by the central thickness CT1 of the first lens, the central thickness CT4 of the fourth lens, the Abbe number v1 of the first lens material, and the Abbe number v4 of the fourth lens material is: 1.7 < (v4 + v1) × CT4 / (CT1 × (v1 - v4)) < 3.7. When the above conditions are met, the optical path differences of the RGB three-color lights in the first lens and the fourth lens are reasonably allocated, which is beneficial to correcting the axial chromatic aberration of the near-eye display lens. More specifically, CT1, CT4, v1, and v4 satisfy: 1.8 ≤ (v4 + v1) × CT4 / (CT1 × (v1 - v4)) ≤ 3.65. For example, 1.84 ≤ (v4 + v1) × CT4 / (CT1 × (v1 - v4)) ≤ 3.60.

[0062] In this exemplary embodiment, the conditional expression satisfied by the curvature radius R3 on the inner side of the second lens, the curvature radius R6 on the outer side of the third lens, and half of the maximum field of view Semi-FOV of the near-eye display lens is: 0.8 < (R3 - R6) × tan(Semi-FOV) / |(R3 + R6)| < 8.7. When the above conditions are met, the maximum field of view of the near-eye display lens is restricted, which is beneficial to making the field of view of the near-eye display lens as large as possible to obtain a good immersive visual experience effect. More specifically, R3, R6, and Semi-FOV satisfy: 1 ≤ (R3 - R6) × tan(Semi-FOV) / |(R3 + R6)| ≤ 8.5. For example, 1.04 ≤ (R3 - R6) × tan(Semi-FOV) / |(R3 + R6)| ≤ 8.49.

[0063] In this exemplary embodiment, the conditional formula satisfied by the effective focal length f4 of the fourth lens and the Abbe number v4 of the fourth lens material is: 1.3 mm < f4 / v4. When the above conditions are satisfied, the focal length and Abbe number of the fourth lens are controlled, which is beneficial to correcting the axial chromatic aberration of the near-eye display lens. More specifically, f4 and v4 satisfy: 1.4 mm ≤ f4 / v4 ≤ 12 mm. For example, 1.50 mm ≤ f4 / v4 ≤ 11.75 mm.

[0064] In this exemplary embodiment, the above near-eye display lens may further include a diaphragm. The diaphragm can be set at an appropriate position according to needs. For example, the diaphragm can be set between the inner side and the first lens. Optionally, the above near-eye display lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0065] The near-eye display lens according to the above embodiment of the present invention may employ multiple lenses, such as the four lenses described above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the axial spacing between each lens, etc., the near-eye display lens has a large imaging image plane, has the characteristics of a wide imaging range and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[0066] In an exemplary embodiment, at least one of the lens surfaces of each lens is an aspherical surface, that is, at least one of the inner surface of the first lens to the outer surface of the fourth lens is an aspherical surface. The characteristics of an aspherical lens are: from the center of the lens to the periphery of the lens, the curvature changes continuously. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, at least one of the inner surface and the outer surface of each of the first lens, the second lens, the third lens, and the fourth lens is an aspherical surface. Optionally, both the inner surface and the outer surface of each of the first lens, the second lens, the third lens, and the fourth lens are aspherical surfaces.

[0067] However, those skilled in the art should understand that without departing from the technical solutions claimed in this application, the number of lenses constituting the near-eye display lens can be changed to obtain the various results and advantages described in this specification. For example, although four lenses are described as an example in the embodiment, the near-eye display lens is not limited to including four lenses. If necessary, the near-eye display lens may further include other numbers of lenses.

[0068] The following further describes specific embodiments of the near-eye display lens applicable to the above embodiments with reference to the accompanying drawings. Specific Embodiment 1

[0070] Figure 1 Schematic diagram of the lens group structure of the near-eye display lens embodiment 1 of the present invention, Figure 1 The left side is the inner side of the near-eye display lens, and the right side is the outer side. The near-eye display lens includes, from the inner side to the outer side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0071] The first lens E1 has positive power, its inner side surface S1 is convex, and its outer side surface S2 is concave. The second lens E2 has negative power, its inner side surface S3 is convex, and its outer side surface S4 is concave. The third lens E3 has positive power, its inner side surface S5 is concave, and its outer side surface S6 is convex. The fourth lens E4 has positive power, its inner side surface S7 is convex, and its outer side surface S8 is concave. The filter E5 has an inner side surface S9 and an outer side surface S10. The light from the object passes through each surface of the surfaces S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0072] As shown in Table 1, it is a basic parameter table of the near-eye display lens of Example 1, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0073] Face number Surface type Radius of curvature Thickness / distance focal length Refractive Index Dispersion coefficient Cone coefficient STO Spherical endless 12 S1 Spherical 23.9135 6.6987 32.49 1.82 46.6 0.0000 S2 Spherical 199.8365 0.1000 0.0000 S3 Aspheric 22.2273 3.2120 -82.00 1.64 22.5 0.4070 S4 Aspheric 14.8054 5.6762 -0.0145 S5 Aspheric -82.5850 3.0347 66.02 1.54 56.1 10.4788 S6 Aspheric -25.4615 1.9699 -17.4397 S7 Spherical 21.1807 9.2403 131.06 1.95 17.9 0.0000 S8 Spherical 20.0000 5.3840 0.0000 S9 Spherical endless 0.7000 1.51 64.2 S10 Spherical endless 0.0600 DIS Spherical endless

[0074] Table 1

[0075] As shown in Table 2, in Example 1, the total effective focal length of the near-eye display lens is f=23.48 mm, the distance TTL from the inner side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis is 36.08 mm, and half of the maximum field of view angle of the near-eye display lens is Semi-FOV=29.9°.

[0076]

[0077]

[0078] Table 2

[0079] The near-eye display lens in Example 1 satisfies:

[0080] f / f1+f / f4=0.90, where f is the effective focal length of the near-eye display lens, f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens;

[0081] log(T23 / T34)=0.46, where T23 is the distance on the optical axis from the outer side of the second lens to the inner side of the third lens, and T34 is the distance on the optical axis from the outer side of the third lens to the inner side of the fourth lens;

[0082] log(Fno / (v2+v4))=-1.24, where Fno is the numerical aperture of the near-eye display lens, v2 is the Abbe number of the second lens material, and v4 is the Abbe number of the fourth lens material;

[0083] (f4-f3) / Fno=27.70 mm, where Fno is the numerical aperture of the near-eye display lens, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens;

[0084] SL / TD=1.61, where SL is the distance from the aperture to the display screen on the optical axis, and TD is the distance from the inner side of the first lens to the outer side of the fourth lens on the optical axis;

[0085] DT41 / DT32=1.26, where DT41 is the effective semi-aperture of the inner side of the fourth lens, and DT32 is the effective semi-aperture of the outer side of the third lens;

[0086] DT42 / CT4=1.86, where DT42 is the effective semi-aperture of the outer side of the fourth lens, and CT4 is the center thickness of the fourth lens;

[0087] ET3 / CT3=0.83, where ET3 is the edge thickness of the third lens, and CT3 is the center thickness of the third lens;

[0088] (v4+v1)×CT4 / (CT1×(v1-v4))=3.10, wherein CT1 is the center thickness of the first lens, CT4 is the center thickness of the fourth lens, v1 is the Abbe number of the first lens material, and v4 is the Abbe number of the fourth lens material;

[0089] (R3-R6)×tan(Semi-FOV) / |(R3+R6)|=8.49, where R3 is the inner radius of curvature of the second lens, R6 is the outer radius of curvature of the third lens, and Semi-FOV is half of the maximum field of view of the near-eye display lens;

[0090] f4 / v4=7.32 mm, wherein f4 is the effective focal length of the fourth lens, and v4 is the Abbe number of the material of the fourth lens.

[0091] In Embodiment 1, the inner side surface and the outer side surface of any one of the second lens E2 and the third lens E3 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0092]

[0093] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1); k is the cone coefficient; Ai is the correction coefficient of the i-th order aspheric surface.

[0094] In Example 1, the inner side surface and the outer side surface of any one of the second lens E2 and the third lens E3 are both aspherical surfaces. Table 3 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A73, A74, A75 10 , A 12 , A 14 and A 16 .

[0095] Face number A4 A6 A8 A10 A12 A14 A16 S3 2.5374E-04 -8.2298E-06 1.1365E-07 -9.3271E-10 4.5736E-12 -1.2144E-14 1.3288E-17 S4 3.2685E-04 -9.5178E-06 1.0631E-07 -5.6332E-10 3.0319E-14 1.2434E-14 -3.6108E-17 S5 -1.9771E-04 6.6054E-06 -8.9174E-08 6.5561E-10 -2.7157E-12 6.1517E-15 -6.1275E-18 S6 -2.6954E-04 3.8452E-06 4.6209E-09 -5.8527E-10 6.4335E-12 -2.8379E-14 4.4974E-17

[0096] Table 3

[0097] Figure 2 The axial chromatic aberration curve of the near-eye display lens of Example 1 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 3 FIG. 1 is a schematic diagram showing the diffuse spots of the near-eye display lens of Example 1. Figure 2 and Figure 3 It can be seen from the figure that the near-eye display lens provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0099] Figure 4 Schematic diagram of the lens group structure of the near-eye display lens embodiment 2 of the present invention, Figure 4 The left side is the inner side of the near-eye display lens, and the right side is the outer side. The near-eye display lens includes, from the inner side to the outer side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0100] The first lens E1 has positive power, its inner side surface S1 is convex, and its outer side surface S2 is concave. The second lens E2 has negative power, its inner side surface S3 is convex, and its outer side surface S4 is concave. The third lens E3 has positive power, its inner side surface S5 is concave, and its outer side surface S6 is convex. The fourth lens E4 has positive power, its inner side surface S7 is convex, and its outer side surface S8 is concave. The filter E5 has an inner side surface S9 and an outer side surface S10. The light from the object passes through each surface of the surfaces S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0101] As shown in Table 4, it is a basic parameter table of the near-eye display lens of Example 2, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0102]

[0103]

[0104] Table 4

[0105] As shown in Table 5, in Example 2, the total effective focal length f of the near-eye display lens is 22.76 mm, the distance TTL from the inner side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis is 36.08 mm, and the half of the maximum field of view angle Semi-FOV of the near-eye display lens is 30.0°. The parameters of each relational expression are as explained in the first embodiment, and the values ​​of each relational expression are listed in the following table.

[0106]

[0107] Table 5

[0108] In Example 2, the inner side surface and the outer side surface of any one of the second lens E2 and the third lens E3 are both aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A 10 , A 12 , A 14 and A 16 .

[0109] Face number A4 A6 A8 A10 A12 A14 A16 S3 -3.7669E-05 -2.1981E-07 -1.2497E-09 3.0839E-11 -1.7200E-13 5.5205E-16 -8.7671E-19 S4 1.5075E-04 -2.0445E-06 6.6756E-09 6.0743E-11 -1.0258E-12 5.7082E-15 -1.0856E-17 S5 -1.3213E-04 5.7509E-06 -1.2299E-07 1.4420E-09 -9.4785E-12 3.2823E-14 -4.6904E-17 S6 -1.9160E-04 4.1052E-06 -5.3914E-08 3.9923E-10 -1.1008E-12 4.5038E-17 1.9205E-18

[0110] Table 6

[0111] Figure 5 The axial chromatic aberration curve of the near-eye display lens of Example 2 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6 FIG. 2 shows a schematic diagram of the diffuse spots of the near-eye display lens of Example 2. Figure 5 and Figure 6 As shown, the near-eye display lens provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0113] Figure 7 Schematic diagram of the lens group structure of the near-eye display lens embodiment 3 of the present invention, Figure 7 The left side is the inner side of the near-eye display lens, and the right side is the outer side. The near-eye display lens includes, from the inner side to the outer side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0114] The first lens E1 has positive power, its inner side surface S1 is convex, and the outer side surface S2 is concave. The second lens E2 has negative power, its inner side surface S3 is convex, and the outer side surface S4 is concave. The third lens E3 has positive power, its inner side surface S5 is convex, and the outer side surface S6 is convex. The fourth lens E4 has positive power, its inner side surface S7 is convex, and the outer side surface S8 is concave. The filter E5 has an inner side surface S9 and an outer side surface S10. The light from the object passes through each surface of the surfaces S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0115] As shown in Table 7, it is a basic parameter table of the near-eye display lens of Example 3, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0116] Face number Surface type Radius of curvature Thickness / distance focal length Refractive Index Dispersion coefficient Cone coefficient STO Spherical endless 12 S1 Spherical 24.8702 4.7936 49.14 1.82 46.6 0.0000 S2 Spherical 59.0883 0.1000 0.0000 S3 Aspheric 10.7976 2.5310 -69.86 1.64 22.5 -4.9053 S4 Aspheric 7.9211 6.4580 -3.8899 S5 Aspheric 35.0827 4.9794 30.47 1.54 56.1 -27.5627 S6 Aspheric -30.1813 0.5136 2.3974 S7 Spherical 19.4806 6.6644 170.34 1.95 17.9 0.0000 S8 Spherical 18.3927 9.2146 0.0000 S9 Spherical endless 0.7000 1.51 64.2 S10 Spherical endless 0.0501 DIS Spherical endless

[0117] Table 7

[0118] As shown in Table 8, in Example 3, the total effective focal length of the near-eye display lens f=23.24 mm, the distance TTL from the inner side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis=36.00 mm, and the half of the maximum field of view angle Semi-FOV of the near-eye display lens=29.3°. The parameters of each relational expression are as explained in the first embodiment, and the values ​​of each relational expression are listed in the following table.

[0119]

[0120] Table 8

[0121] In Example 3, the inner side surface and the outer side surface of any one of the second lens E2 and the third lens E3 are both aspherical surfaces. Table 9 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A 10 , A 12 , A 14 and A 16 .

[0122]

[0123]

[0124] Table 9

[0125] Figure 8 The axial chromatic aberration curve of the near-eye display lens of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 9 FIG. 3 shows a schematic diagram of the diffuse spots of the near-eye display lens of Example 3. Figure 8 and Fig. 9It can be seen from the figure that the near-eye display lens provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0127] Fig.10 Schematic diagram of the lens group structure of the near-eye display lens embodiment 4 of the present invention, Fig.10 The left side is the inner side of the near-eye display lens, and the right side is the outer side. The near-eye display lens includes, from the inner side to the outer side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0128] The first lens E1 has positive power, its inner side surface S1 is convex, and the outer side surface S2 is concave. The second lens E2 has positive power, its inner side surface S3 is convex, and the outer side surface S4 is concave. The third lens E3 has negative power, its inner side surface S5 is concave, and the outer side surface S6 is convex. The fourth lens E4 has positive power, its inner side surface S7 is convex, and the outer side surface S8 is convex. The filter E5 has an inner side surface S9 and an outer side surface S10. The light from the object passes through each surface of the surfaces S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0129] As shown in Table 10, it is a basic parameter table of the near-eye display lens of Example 4, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0130] Face number Surface type Radius of curvature Thickness / distance focal length Refractive Index Dispersion coefficient Cone coefficient STO Spherical endless 12 S1 Spherical 32.6738 4.3138 50.82 1.82 46.6 0.0000 S2 Spherical 141.1133 0.1000 0.0000 S3 Aspheric 14.2095 3.7180 292.41 1.64 22.5 -1.9662 S4 Aspheric 13.7678 5.6123 -8.7717 S5 Aspheric -9.8486 3.1842 -280.02 1.54 56.1 -9.8389 S6 Aspheric -11.7286 0.5391 -5.0542 S7 Spherical 29.1436 6.9171 26.87 1.95 17.9 0.0000 S8 Spherical -205.4713 10.8649 0.0000 S9 Spherical endless 0.7000 1.51 64.2 S10 Spherical endless 0.0879 DIS Spherical endless

[0131] Table 10

[0132] As shown in Table 11, in Example 4, the total effective focal length f of the near-eye display lens is 22.31 mm, the distance TTL from the inner side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis is 36.04 mm, and the half of the maximum field of view angle Semi-FOV of the near-eye display lens is 30.0°. The parameters of each relational expression are as explained in the first embodiment, and the values ​​of each relational expression are listed in the following table.

[0133]

[0134] Table 11

[0135] In Example 4, the inner side surface and the outer side surface of any one of the second lens E2 and the third lens E3 are both aspherical surfaces. Table 12 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, 10 , A 12 , A 14 and A 16 .

[0136] Face number A4 A6 A8 A10 A12 A14 A16 S3 -1.3994E-05 1.0161E-06 8.3266E-10 -3.3382E-10 3.4646E-12 -1.3660E-14 1.9391E-17 S4 2.1916E-04 -4.9087E-06 1.1563E-07 -1.7119E-09 1.2753E-11 -4.5842E-14 6.3887E-17 S5 -8.3296E-04 1.4914E-05 3.1938E-08 -2.4181E-09 2.2354E-11 -8.7595E-14 1.2910E-16 S6 -1.1496E-04 -2.1825E-06 1.8099E-07 -2.2565E-09 1.3182E-11 -4.0730E-14 5.4909E-17

[0137] Table 12

[0138] Fig.11 The axial chromatic aberration curve of the near-eye display lens of Example 4 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.12 FIG. 4 is a schematic diagram showing the diffuse spots of the near-eye display lens of Example 4. Fig.11 and Fig.12 As shown, the near-eye display lens provided in Example 4 can achieve good imaging quality. Specific embodiment 5

[0140] Fig.13 Schematic diagram of the lens group structure of embodiment 5 of the near-eye display lens of the present invention, Fig.13 The left side is the inner side of the near-eye display lens, and the right side is the outer side. The near-eye display lens includes, from the inner side to the outer side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0141] The first lens E1 has positive power, its inner side surface S1 is convex, and the outer side surface S2 is concave. The second lens E2 has negative power, its inner side surface S3 is convex, and the outer side surface S4 is concave. The third lens E3 has positive power, its inner side surface S5 is convex, and the outer side surface S6 is convex. The fourth lens E4 has positive power, its inner side surface S7 is convex, and the outer side surface S8 is concave. The filter E5 has an inner side surface S9 and an outer side surface S10. The light from the object passes through each surface of the surfaces S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0142] As shown in Table 13, it is a basic parameter table of the near-eye display lens of Example 5, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0143] Face number Surface type Radius of curvature Thickness / distance focal length Refractive Index Dispersion coefficient Cone coefficient STO Spherical endless 12 S1 Spherical 25.2031 5.7776 37.93 1.82 46.6 0.0000 S2 Spherical 117.8872 0.1000 0.0000 S3 Aspheric 8.9178 2.0000 -51.82 1.65 21.7 -4.5567 S4 Aspheric 6.4426 5.6585 -3.2394 S5 Aspheric 31.4882 5.8188 29.67 1.54 56.1 -31.5480 S6 Aspheric -31.3671 3.5580 3.8446 S7 Spherical 19.0118 5.5733 210.28 1.95 17.9 0.0000 S8 Spherical 17.9619 6.8302 0.0000 S9 Spherical endless 0.7000 1.51 64.2 S10 Spherical endless 0.0433 DIS Spherical endless

[0144] Table 13

[0145] As shown in Table 14, in Example 5, the total effective focal length f of the near-eye display lens is 23.08 mm, the distance TTL from the inner side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis is 36.06 mm, and the half of the maximum field angle Semi-FOV of the near-eye display lens is 30.0°. The parameters of each relational expression are as explained in the first embodiment, and the values ​​of each relational expression are listed in the following table.

[0146]

[0147] Table 14

[0148] In Example 5, the inner side surface and the outer side surface of any one of the second lens E2 and the third lens E3 are both aspherical surfaces. Table 15 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A63, A70, A71, A72, A73, A74, A75 10 , A 12 , A 14 and A 16 .

[0149] Face number A4 A6 A8 A10 A12 A14 A16 S3 4.2639E-05 -1.1734E-06 7.7306E-09 -4.4183E-11 2.9389E-13 -1.1672E-15 1.8165E-18 S4 1.3594E-04 -1.9694E-06 1.6088E-08 -1.0055E-10 4.4782E-13 -1.1483E-15 9.1348E-19 S5 -4.8592E-05 1.0687E-06 -1.4242E-08 2.5268E-10 -2.4170E-12 1.1311E-14 -2.2163E-17 S6 -2.3009E-05 -3.4386E-08 1.7582E-08 -3.0635E-10 3.1159E-12 -1.5489E-14 2.8810E-17

[0150] Table 15

[0151] Fig.14 The axial chromatic aberration curve of the near-eye display lens of Example 5 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig.15 FIG. 5 shows a schematic diagram of the diffuse spots of the near-eye display lens of Example 5. Fig.14 and Fig.15 As shown, the near-eye display lens provided in Example 5 can achieve good imaging quality. Specific embodiment 6

[0153] Fig.16 Schematic diagram of the lens group structure of embodiment 6 of the near-eye display lens of the present invention, Fig.16 The left side is the inner side of the near-eye display lens, and the right side is the outer side. The near-eye display lens includes, from the inner side to the outer side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0154] The first lens E1 has positive power, its inner side surface S1 is convex, and the outer side surface S2 is concave. The second lens E2 has negative power, its inner side surface S3 is convex, and the outer side surface S4 is concave. The third lens E3 has positive power, its inner side surface S5 is convex, and the outer side surface S6 is convex. The fourth lens E4 has positive power, its inner side surface S7 is convex, and the outer side surface S8 is concave. The filter E5 has an inner side surface S9 and an outer side surface S10. The light from the object passes through each surface of the surfaces S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0155] As shown in Table 16, it is a basic parameter table of the near-eye display lens of Example 6, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0156] Face number Surface type Radius of curvature Thickness / distance focal length Refractive Index Dispersion coefficient Cone coefficient STO Spherical endless 12 S1 Spherical 28.8112 4.7986 45.40 1.82 46.5 0.0000 S2 Spherical 116.9148 0.1000 0.0000 S3 Aspheric 12.0917 2.8792 -54.40 1.66 20.4 -4.9097 S4 Aspheric 8.2141 6.1235 -3.9975 S5 Aspheric 30.8944 5.1567 30.09 1.54 56.1 -62.8294 S6 Aspheric -33.2122 0.1000 3.5717 S7 Spherical 18.4649 4.9842 119.03 1.95 17.9 0.0000 S8 Spherical 19.0922 11.1828 0.0000 S9 Spherical endless 0.7000 1.51 64.2 S10 Spherical endless 0.0454 DIS Spherical endless

[0157] Table 16

[0158] As shown in Table 17, in Example 6, the total effective focal length f of the near-eye display lens is 23.62 mm, the distance TTL from the inner side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis is 36.14 mm, and the half of the maximum field of view angle Semi-FOV of the near-eye display lens is 30.0°. The parameters of each relational expression are as explained in the first embodiment, and the values ​​of each relational expression are listed in the following table.

[0159]

[0160]

[0161] Table 17

[0162] In Example 6, the inner side surface and the outer side surface of any one of the second lens E2 and the third lens E3 are both aspherical surfaces. Table 18 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, 10 , A 12 , A 14 and A 16 .

[0163] Face number A4 A6 A8 A10 A12 A14 A16 S3 -3.3374E-05 3.5930E-07 -6.0801E-09 4.1636E-11 -1.2830E-13 1.8644E-16 -1.0412E-19 S4 1.0470E-04 -1.9831E-06 1.9796E-08 -1.4208E-10 5.7721E-13 -1.1961E-15 1.0040E-18 S5 5.5565E-05 -1.4992E-06 2.5684E-08 -2.8241E-10 2.0738E-12 -8.7497E-15 1.4519E-17 S6 -5.4182E-05 1.7249E-06 -2.6684E-08 2.7897E-10 -1.4897E-12 3.8739E-15 -3.9514E-18

[0164] Table 18

[0165] Fig.17 The axial chromatic aberration curve of the near-eye display lens of Example 6 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.18 FIG. 6 is a schematic diagram showing the diffuse spots of the near-eye display lens of Example 6. Fig.17 and Fig.18 As shown, the near-eye display lens provided in Example 6 can achieve good imaging quality. Specific embodiment 7

[0167] Fig.19 Schematic diagram of the lens group structure of embodiment 7 of the near-eye display lens of the present invention, Fig.19 The left side is the inner side of the near-eye display lens, and the right side is the outer side. The near-eye display lens includes, from the inner side to the outer side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0168] The first lens E1 has positive power, its inner side surface S1 is convex, and the outer side surface S2 is concave. The second lens E2 has negative power, its inner side surface S3 is convex, and the outer side surface S4 is concave. The third lens E3 has positive power, its inner side surface S5 is convex, and the outer side surface S6 is convex. The fourth lens E4 has positive power, its inner side surface S7 is convex, and the outer side surface S8 is concave. The filter E5 has an inner side surface S9 and an outer side surface S10. The light from the object passes through each surface of the surfaces S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0169] As shown in Table 19, it is a basic parameter table of the near-eye display lens of Example 7, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0170]

[0171]

[0172] Table 19

[0173] As shown in Table 20, in Example 7, the total effective focal length f of the near-eye display lens is 22.92 mm, the distance TTL from the inner side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis is 36.05 mm, and the half of the maximum field angle Semi-FOV of the near-eye display lens is 30.0°. The parameters of each relational expression are as explained in the first embodiment, and the values ​​of each relational expression are listed in the following table.

[0174]

[0175] Table 20

[0176] In Example 7, the inner side surface and the outer side surface of any one of the second lens E2 and the third lens E3 are both aspherical surfaces. Table 21 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, 10 , A 12 , A 14 and A 16 .

[0177] Face number A4 A6 A8 A10 A12 A14 A16 S3 1.2301E-04 -3.2267E-06 2.6788E-08 -1.1199E-10 2.5365E-13 -2.9414E-16 1.3655E-19 S4 1.9032E-04 -2.9774E-06 1.6053E-08 3.5412E-11 -8.2330E-13 3.3095E-15 -4.2924E-18 S5 -1.0634E-04 1.9750E-07 5.3891E-08 -8.1457E-10 5.6422E-12 -1.9629E-14 2.6953E-17 S6 -3.1026E-05 -2.2387E-07 1.6825E-08 -9.8108E-11 3.3385E-13 -9.0908E-16 1.1018E-18

[0178] Table 21

[0179] Fig. 20 The axial chromatic aberration curve of the near-eye display lens of Example 7 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig.21 FIG. 4 is a schematic diagram showing the diffuse spots of the near-eye display lens of Example 7. Fig. 20 and Fig.21As shown, the near-eye display lens provided in Example 7 can achieve good imaging quality.

[0180] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A near-eye display lens, characterized in that: The near-eye display lens has four lenses with optical power, and the near-eye display lens includes the following in order from the inside to the outside along the optical axis: A first lens having positive power, wherein the inner side surface is convex and the outer side surface is concave; A second lens having optical power, wherein the inner side surface is convex and the outer side surface is concave; a third lens having optical power, the outer side of which is convex; a fourth lens element having positive refractive power, the inner side surface of which is convex; The second lens has negative optical power and the third lens has positive optical power, or the second lens has positive optical power and the third lens has negative optical power; At least one of the first to fourth lenses is made of glass; The effective focal length f of the near-eye display lens, the effective focal length f1 of the first lens, and the effective focal length f4 of the fourth lens satisfy: 0.61≤f / f1+f / f4≤1.27; The center thickness CT1 of the first lens, the center thickness CT4 of the fourth lens, the Abbe number v1 of the first lens material, and the Abbe number v4 of the fourth lens material satisfy: 1.84≤(v4+v1)×CT4 / (CT1×(v1-v4))≤3.

6.

2. The near-eye display lens according to claim 1, characterized in that: A distance T23 on the optical axis from the outer side of the second lens to the inner side of the third lens and a distance T34 on the optical axis from the outer side of the third lens to the inner side of the fourth lens satisfy: 0.2≤log(T23 / T34)≤1.

79.

3. The near-eye display lens according to claim 1, characterized in that: The numerical aperture Fno of the near-eye display lens, the Abbe number v2 of the second lens material, and the Abbe number v4 of the fourth lens material satisfy: -1.3 <log(Fno / (v2+v4))≤-1.21。 4. The near-eye display lens according to claim 1, characterized in that: The numerical aperture Fno of the near-eye display lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy: 2.81 mm ≤ (f4 - f3) / Fno ≤ 137.58 mm.

5. The near-eye display lens according to claim 1, characterized in that: A distance SL from the aperture to the display screen on the optical axis and a distance TD from the inner side of the first lens to the outer side of the fourth lens on the optical axis satisfy: 1.61≤SL / TD≤1.

99.

6. The near-eye display lens according to claim 1, characterized in that: The effective half-aperture DT41 of the inner side of the fourth lens and the effective half-aperture DT32 of the outer side of the third lens satisfy: 1.12≤DT41 / DT32≤1.

26.

7. The near-eye display lens according to claim 1, characterized in that: The effective semi-aperture DT42 of the outer side of the fourth lens and the center thickness CT4 of the fourth lens satisfy: 1.86≤DT42 / CT4≤2.

72.

8. The near-eye display lens according to claim 1, characterized in that: An edge thickness ET3 of the third lens and a center thickness CT3 of the third lens satisfy: 0.35≤ET3 / CT3≤1.

73.

9. The near-eye display lens according to claim 1, characterized in that: The curvature radius R3 on the inner side of the second lens, the curvature radius R6 on the outer side of the third lens, and half of the maximum field of view angle Semi-FOV of the near-eye display lens satisfy: 1.04≤(R3-R6)×tan(Semi-FOV) / |(R3+R6)|≤8.

49.

10. The near-eye display lens according to claim 1, characterized in that: An effective focal length f4 of the fourth lens and an Abbe number v4 of a material of the fourth lens satisfy: 1.5 mm ≤ f4 / v4 ≤ 11.75 mm.

Images