Optical imaging lens

Abstract

The present application provides an optical imaging lens, including: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. Each lens has a human-eye side facing the human eye and an image-source side facing the image source. Among them, the first lens has a positive optical power, the paraxial part of its human-eye side is convex, and the paraxial part of its image-source side is convex; the second lens has an optical power, and the paraxial part of its human-eye side is concave; the third lens has a positive optical power; the fifth lens has a negative optical power, and the paraxial part of its image-source side is concave; wherein, the maximum field of view FOV of the optical imaging lens, the entrance pupil diameter EPD of the optical imaging lens, and the total effective focal length f of the optical imaging lens satisfy: 0.35 < tan(FOV / 2) * EPD / f < 1; and the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 1.8 < CT1 / CT2 < 4.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to an optical imaging lens. Background Art

[0002] Virtual Reality (VR) is a computer simulation system that allows users to create and experience a virtual world. It uses computers to generate a simulated environment, integrating multiple information, interactive three-dimensional dynamic scenes, and physical behaviors, immersing users in the virtual world. However, existing VR display devices are bulky and difficult to carry, significantly impacting user experience. This is one of the reasons VR has not yet gained widespread acceptance.

[0003] Optical imaging lenses, as display eyepieces, are the core optical components of VR headsets. Key indicators such as the eyepiece's image quality, weight, and size are directly related to the user experience and comfort when wearing a VR headset. Therefore, miniaturization of the eyepiece is a key trend in the development of VR headsets. On the other hand, with the advancement of display technology, higher requirements are being placed on the imaging quality of the matching eyepieces. Typically, to meet the miniaturization requirements of VR headset eyepieces, the number of lenses in the eyepiece ranges from one to three, but this cannot achieve the higher requirements for clarity and imaging quality. Furthermore, increasing the number of eyepiece lenses makes it difficult to meet the demand for miniaturization. Therefore, how to ensure that VR headsets have good imaging quality while maintaining miniaturization is one of the most pressing issues in this field. Summary of the Invention

[0004] The present application provides an optical imaging lens, which includes, in order from the human eye side to the image source side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, each lens having a human eye side surface close to the human eye side and an image source side surface close to the image source side, wherein the first lens has positive optical power, and the paraxial portion of the human eye side surface is convex, and the paraxial portion of the image source side surface is convex; the second lens has optical power, and the paraxial portion of the human eye side surface is concave; the third lens has positive optical power; the fifth lens has negative optical power, and the paraxial portion of the image source side surface is concave; wherein the maximum field of view FOV of the optical imaging lens, the entrance pupil diameter EPD of the optical imaging lens, and the total effective focal length f of the optical imaging lens satisfy the following conditions: 0.35 <tan(FOV / 2)*EPD / f<1;以及所述第一透镜的中心厚度CT1与所述第二透镜的中心厚度CT2满足:1.8<CT1 / CT2<4。

[0005] In some embodiments, the curvature radius R3 of the side surface of the second lens and the center thickness CT2 of the second lens satisfy: <R3 / CT2<0。

[0006] In some embodiments, the maximum refractive index N1max among the first lens, the second lens, and the third lens and the maximum refractive index N2max among the fourth lens and the fifth lens satisfy: N2max > N1max, where N2max > 1.8.

[0007] In some embodiments, the radius of curvature R7 of the eye side of the fourth lens and the radius of curvature R10 of the image source side of the fifth lens satisfy: 0.7 < R7 / R10 < 1.1.

[0008] In some embodiments, the radius of curvature R10 of the image source side of the fifth lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.2 < R10 / f45 < 0.6.

[0009] In some embodiments, the central thickness CT2 of the second lens and the central thickness CT4 of the fourth lens satisfy: 0.2 < CT2 / CT4 < 0.6.

[0010] In some embodiments, the maximum value DTmax of the maximum effective semi-aperture from the eye side of the first lens to the image source side of the fifth lens and the on-axis distance TD from the eye side of the first lens to the image source side of the fifth lens satisfy: 0.4 < DTmax / TD < 0.7.

[0011] In some embodiments, the edge thickness ET3 of the third lens at the maximum effective semi-aperture and the edge thickness ET2 of the second lens at the maximum effective semi-aperture satisfy: ET3 / ET2 < 0.5.

[0012] In some embodiments, the central thickness CT4 of the fourth lens, the central thickness CT5 of the fifth lens, the edge thickness ET4 of the fourth lens at the maximum effective semi-aperture, and the edge thickness ET5 of the fifth lens at the maximum effective semi-aperture satisfy: 1.2 < (CT4 + CT5) / (ET4 + ET5) < 1.7.

[0013] In some embodiments, the maximum effective semi-aperture DT32 of the image source side of the third lens and the maximum effective semi-aperture DT41 of the eye side of the fourth lens satisfy: 1 < DT32 / DT41 < 1.5.

[0014] In some embodiments, the on-axis distance Tr1r6 from the eye side of the first lens to the image source side of the third lens, the central thickness CT4 of the fourth lens, the spacing distance T45 between the fourth lens and the fifth lens along the optical axis, and the central thickness CT5 of the fifth lens satisfy: 0.3 < (CT4 + T45 + CT5) / Tr1r6 < 0.7.

[0015] In some embodiments, the maximum effective semi-aperture DT12 of the image source side of the first lens and the maximum effective semi-aperture DT21 of the eye side of the second lens satisfy: 0.8 < DT12 / DT21 < 1.1.

[0016] In some embodiments, the sum ∑ET of the edge thicknesses of the first lens to the fifth lens at the maximum effective semi-aperture and the sum ∑CT of the central thicknesses of the first lens to the fifth lens satisfy: 0.6 < ∑ET / ∑CT < 1.

[0017] In some embodiments, the spacing distance T12 between the first lens and the second lens along the optical axis, the spacing distance T23 between the second lens and the third lens along the optical axis, and the sum ∑AT of the air spaces on the optical axis between any two adjacent lenses among the first lens to the fifth lens satisfy: 0.7 < (T12 + T23) / ∑AT < 1.

[0018] In some embodiments, the effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy: -1 < f2 / f1 < -0.3.

[0019] In some embodiments, the maximum refractive index N1max among the first lens, the second lens, and the third lens and the refractive index N2 of the second lens satisfy: 0.05 < (N1max - N2) / N2 < 0.15.

[0020] The present application also provides an optical imaging lens, which sequentially includes, along the optical axis from the human eye side to the image source side: a first lens group and a second lens group, wherein the first lens group includes a first lens, a second lens and a third lens, and the second lens group includes a fourth lens and a fifth lens. Each lens has a human eye side surface close to the human eye side and an image source side surface close to the image source side. Among them, the first lens has a positive optical power, the second lens has a negative optical power, and at least one of the first lens, the second lens and the third lens is a biconvex lens; the second lens group has a positive optical power, the optical power positive and negative attributes of the fourth lens and the fifth lens are different, and the paraxial part of the image source side surface of the fifth lens is concave; and the combined focal length f45 of the fourth lens and the fifth lens and the axial distance TD from the human eye side surface of the first lens to the image source side surface of the fifth lens satisfy: 1 < f45 / TD < 3.

[0021] In some embodiments, the radius of curvature R3 of the human eye side surface of the second lens and the central thickness CT2 of the second lens satisfy: -1 < R3 / CT2 < 0.

[0022] In some embodiments, the maximum refractive index N1max among the first lens, the second lens and the third lens and the maximum refractive index N2max among the fourth lens and the fifth lens satisfy: N2max > N1max, where N2max > 1.8.

[0023] In some embodiments, the radius of curvature R7 of the human eye side surface of the fourth lens and the radius of curvature R10 of the image source side surface of the fifth lens satisfy: 0.7 < R7 / R10 < 1.1.

[0024] In some embodiments, the radius of curvature R10 of the image source side surface of the fifth lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.2 < R10 / f45 < 0.6.

[0025] In some embodiments, the central thickness CT2 of the second lens and the central thickness CT4 of the fourth lens satisfy: 0.2 < CT2 / CT4 < 0.6.

[0026] In some embodiments, the maximum value DTmax of the maximum effective semi-aperture from the human eye side surface of the first lens to the image source side surface of the fifth lens and the axial distance TD from the human eye side surface of the first lens to the image source side surface of the fifth lens satisfy: 0.4 < DTmax / TD < 0.7.

[0027] In some embodiments, the edge thickness ET3 of the third lens at the maximum effective semi-aperture and the edge thickness ET2 of the second lens at the maximum effective semi-aperture satisfy: ET3 / ET2 < 0.5.

[0028] In some embodiments, the central thickness CT4 of the fourth lens, the central thickness CT5 of the fifth lens, the edge thickness ET4 of the fourth lens at the maximum effective semi-aperture, and the edge thickness ET5 of the fifth lens at the maximum effective semi-aperture satisfy: 1.2 < (CT4 + CT5) / (ET4 + ET5) < 1.7.

[0029] In some embodiments, the maximum effective semi-aperture DT32 of the image source side of the third lens and the maximum effective semi-aperture DT41 of the eye side of the fourth lens satisfy: 1 < DT32 / DT41 < 1.5.

[0030] In some embodiments, the on-axis distance Tr1r6 from the eye side of the first lens to the image source side of the third lens, the central thickness CT4 of the fourth lens, the distance T45 between the fourth lens and the fifth lens along the optical axis, and the central thickness CT5 of the fifth lens satisfy: 0.3 < (CT4 + T45 + CT5) / Tr1r6 < 0.7.

[0031] In some embodiments, the maximum effective semi-aperture DT12 of the image source side of the first lens and the maximum effective semi-aperture DT21 of the eye side of the second lens satisfy: 0.8 < DT12 / DT21 < 1.1. [[ID=!13]]

[0032] In some embodiments, the sum ∑ET of the edge thicknesses of the first lens to the fifth lens at the maximum effective semi-aperture and the sum ∑CT of the central thicknesses of the first lens to the fifth lens satisfy: 0.6 < ∑ET / ∑CT < 1.

[0033] In some embodiments, the distance T12 between the first lens and the second lens along the optical axis, the distance T23 between the second lens and the third lens along the optical axis, and the sum ∑AT of the air gaps on the optical axis between any two adjacent lenses among the first lens to the fifth lens satisfy: 0.7 < (T12 + T23) / ∑AT < 1.

[0034] In some embodiments, the effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy: -1 < f2 / f1 < -0.3.

[0035] In some embodiments, it is characterized in that the maximum refractive index N1max among the first lens, the second lens and the third lens and the refractive index N2 of the second lens satisfy: 0.05 < (N1max - N2) / N2 < 0.15.

[0036] This application adopts a five-piece lens structure. By reasonably distributing the optical powers of the first lens, the third lens and the fifth lens, the surface shapes of the first lens, the second lens and the fifth lens, the maximum field of view angle, entrance pupil diameter and focal length of the optical imaging lens, and the central thicknesses of the first lens and the second lens, the above optical imaging lens can meet the requirements of miniaturization while better correcting the aberrations of the optical imaging lens and obtaining good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] With reference to the accompanying drawings, through the following detailed description of non-limiting embodiments, other features, objectives and advantages of this application will become more apparent. In the drawings:

[0038] Figure 1 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 1 of this application;

[0039] Figures 2A to 2D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and relative illumination curve of the optical imaging lens of Embodiment 1;

[0040] Figure 3 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 2 of this application;

[0041] Figures 4A to 4D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and relative illumination curve of the optical imaging lens of Embodiment 2;

[0042] Figure 5 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 3 of this application;

[0043] Figures 6A to 6D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and relative illumination curve of the optical imaging lens of Embodiment 3;

[0044] Figure 7 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 4 of this application;

[0045] Figures 8A to 8D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and relative illumination curve of the optical imaging lens of Embodiment 4;

[0046] Figure 9 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 5 of this application;

[0047] Figures 10A to 10D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and relative illumination curve of the optical imaging lens of Embodiment 5;

[0048] Figure 11 shows a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present application; and

[0049] Figures 12A to 12D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and relative illumination curve of the optical imaging lens of Embodiment 6. Detailed Embodiments

[0050] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0051] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0052] In the drawings, for the sake of clarity, the thickness, size and shape of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0053] In this document, 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 being photographed is called the object side of the lens, and the surface of each lens closest to the image source surface is called the image source side of the lens.

[0054] It should also be understood that the terms "comprising", "comprises", "having", "including" and / or "includes", when used in this specification, denote the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. Further, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than individual elements in the list. Further, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0055] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formalized sense unless expressly so defined herein.

[0056] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0057] The features, principles and other aspects of the present application will be described in detail below.

[0058] The optical imaging lens according to an exemplary embodiment of the present application may include, for example, five lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens and a fifth lens. These five lenses are arranged in sequence along the optical axis from the human eye side to the image source side. An air gap may be provided between any two adjacent lenses among the first lens to the fifth lens.

[0059] In an exemplary embodiment, the above optical imaging lens may further include at least one aperture stop. The aperture stop may be disposed at an appropriate position as needed. For example, it may be disposed between the human eye side and the first lens.

[0060] In an exemplary embodiment, the first lens may have a positive optical power; the second lens may have a positive or negative optical power; the third lens may have a positive optical power; the fourth lens may have a positive or negative optical power; the fifth lens may have a negative optical power. By reasonably distributing the positive and negative optical powers of the respective lenses of the optical imaging lens, the low-order aberrations of the control system can be effectively balanced and the imaging quality can be improved.

[0061] In an exemplary embodiment, the side of the first lens facing the human eye may be convex, the side facing the image source may be convex, the side of the second lens facing the human eye may be concave, and the side of the fifth lens facing the image source may be concave. By reasonably configuring the shapes of the first lens, the second lens, and the fifth lens, a relatively large adjustment space can be ensured to a certain extent.

[0062] In an exemplary embodiment, the optical imaging lens may satisfy 0.35 < tan(FOV / 2) * EPD / f < 1, where FOV is the maximum field of view angle of the optical imaging lens, EPD is the entrance pupil diameter of the optical imaging lens, and f is the total effective focal length of the optical imaging lens. The optical imaging lens satisfying 0.35 < tan(FOV / 2) * EPD / f < 1 is beneficial to correcting the aberration of the optical imaging lens, obtaining better imaging quality, and at the same time meeting the requirements of miniaturization of the optical imaging lens.

[0063] In an exemplary embodiment, the optical imaging lens may satisfy 1.8 < CT1 / CT2 < 4, where CT1 is the central thickness of the first lens and CT2 is the central thickness of the second lens. The optical imaging lens satisfying 1.8 < CT1 / CT2 < 4 is beneficial to reducing the sensitivity of the first lens and the fourth lens, correcting the field curvature, and achieving a better imaging effect. More specifically, CT1 and CT2 may satisfy: 1.8 < CT1 / CT2 < 3.5.

[0064] In an exemplary embodiment, the optical imaging lens may satisfy -1 < R3 / CT2 < 0, where R3 is the radius of curvature of the side of the second lens facing the human eye and CT2 is the central thickness of the second lens. The optical imaging lens satisfying -1 < R3 / CT2 < 0 is beneficial to correcting the coma and aberration of the off-axis field of view and obtaining good edge image clarity.

[0065] In an exemplary embodiment, the optical imaging lens may satisfy N2max > N1max, where N2max > 1.8, N1max is the maximum refractive index among the first lens, the second lens, and the third lens, and N2max is the maximum refractive index among the fourth lens and the fifth lens. The optical imaging lens satisfying N2max > N1max and N2max > 1.8, configuring lenses with high refractive indices in the optical imaging lens is beneficial to reducing the spherical aberration of the optical imaging lens, correcting the system chromatic aberration at the same time, and improving the imaging quality.

[0066] In an exemplary embodiment, the optical imaging lens may satisfy 0.7 < R7 / R10 < 1.1, where R7 is the radius of curvature of the side of the fourth lens facing the human eye and R10 is the radius of curvature of the side of the fifth lens facing the image source. The optical imaging lens satisfying 0.7 < R7 / R10 < 1.1 is beneficial to the optical imaging lens to correct the lateral chromatic aberration. More specifically, R7 and R10 may satisfy: 0.7 < R7 / R10 < 1.0.

[0067] In an exemplary embodiment, the optical imaging lens may satisfy 0.2 < R10 / f45 < 0.6, where R10 is the radius of curvature of the image source side of the fifth lens, and f45 is the combined focal length of the fourth lens and the fifth lens. The optical imaging lens satisfying 0.2 < R10 / f45 < 0.6 is conducive to the optical imaging lens obtaining a smaller chief ray angle and achieving better picture brightness.

[0068] In an exemplary embodiment, the optical imaging lens may satisfy 0.2 < CT2 / CT4 < 0.6, where CT2 is the central thickness of the second lens, and CT4 is the central thickness of the fourth lens. The optical imaging lens satisfying 0.2 < CT2 / CT4 < 0.6 is conducive to the distance from the human eye side of the first lens of the optical imaging lens to the image source plane along the optical axis being shorter, so as to meet the requirement of miniaturization of the eyepiece.

[0069] In an exemplary embodiment, the optical imaging lens may satisfy 0.4 < DTmax / TD < 0.7, where DTmax is the maximum value of the maximum effective semi-aperture from the human eye side of the first lens to the image source side of the fifth lens, and TD is the axial distance from the human eye side of the first lens to the image source side of the fifth lens. The optical imaging lens satisfying 0.4 < DTmax / TD < 0.7 is conducive to being compatible with a wider eye movement range during the use of the eyepiece, making the experience more comfortable. More specifically, DTmax and TD may satisfy: 0.4 < DTmax / TD < 0.5.

[0070] In an exemplary embodiment, the optical imaging lens may satisfy ET3 / ET2 < 0.5, where ET3 is the edge thickness of the third lens at the maximum effective semi-aperture, and ET2 is the edge thickness of the second lens at the maximum effective semi-aperture. The optical imaging lens satisfying ET3 / ET2 < 0.5 is conducive to correcting the chromatic aberration of the optical imaging lens while ensuring the manufacturability of the second lens and the third lens. More specifically, ET3 and ET2 may satisfy: 0 < ET3 / ET2 < 0.5.

[0071] In an exemplary embodiment, the optical imaging lens may satisfy 1.2 < (CT4 + CT5) / (ET4 + ET5) < 1.7, where CT4 is the central thickness of the fourth lens, CT5 is the central thickness of the fifth lens, ET5 is the edge thickness of the fifth lens at the maximum effective semi-aperture, and ET4 is the edge thickness of the fourth lens at the maximum effective semi-aperture. The optical imaging lens satisfying 1.2 < (CT4 + CT5) / (ET4 + ET5) < 1.7 is conducive to correcting the chromatic aberration of the optical imaging lens while ensuring the manufacturability of the fourth lens and the fifth lens. More specifically, CT4, CT5, ET5 and ET4 may satisfy: 1.3 ≤ (CT4 + CT5) / (ET4 + ET5) < 1.6.

[0072] In an exemplary embodiment, the optical imaging lens may satisfy 1 < DT32 / DT41 < 1.5, where DT32 is the maximum effective semi-aperture of the image source side of the third lens, and DT41 is the maximum effective semi-aperture of the human eye side of the fourth lens. The optical imaging lens satisfying 1 < DT32 / DT41 < 1.5 is beneficial to correcting the coma of the off-axis field of view of the optical imaging lens and avoiding the trailing phenomenon that easily appears in the edge picture during the visual experience. More specifically, DT32 and DT41 may satisfy: 1 < DT32 / DT41 < 1.2.

[0073] In an exemplary embodiment, the optical imaging lens may satisfy 0.3 < (CT4 + T45 + CT5) / Tr1r6 < 0.7, where Tr1r6 is the on-axis distance from the human eye side of the first lens to the image source side of the third lens, CT4 is the central thickness of the fourth lens, CT5 is the central thickness of the fifth lens, and T45 is the distance between the fourth lens and the fifth lens along the optical axis. The optical imaging lens satisfying 0.3 < (CT4 + T45 + CT5) / Tr1r6 < 0.7 is beneficial to the compact arrangement of the lenses in the optical imaging lens, achieving good imaging quality while being miniaturized.

[0074] In an exemplary embodiment, the optical imaging lens may satisfy 0.8 < DT12 / DT21 < 1.1, where DT12 is the maximum effective semi-aperture of the image source side of the first lens, and DT21 is the maximum effective semi-aperture of the human eye side of the second lens. The optical imaging lens satisfying 0.8 < DT12 / DT21 < 1.1 is beneficial to eliminating the astigmatism and aberration of the optical imaging lens, improving the imaging quality, and ensuring the assemblability of the optical imaging lens at the same time. More specifically, DT12 and DT21 may satisfy: 0.9 < DT12 / DT21 < 1.1.

[0075] In an exemplary embodiment, the optical imaging lens may satisfy 0.6 < ∑ET / ∑CT < 1, where ∑ET is the sum of the edge thicknesses of the first lens to the fifth lens at the maximum effective semi-aperture, and ∑CT is the sum of the central thicknesses of the first lens to the fifth lens. The optical imaging lens satisfying 0.6 < ∑ET / ∑CT < 1 is beneficial to reasonably distributing the optical power of each lens in the optical imaging lens and correcting the spherical aberration and aberration of the optical imaging lens. More specifically, ∑ET and ∑CT may satisfy 0.6 < ∑ET / ∑CT < 0.8.

[0076] In an exemplary embodiment, the optical imaging lens may satisfy 0.7 < (T12 + T23) / ∑AT < 1, where T12 is the distance between the first lens and the second lens along the optical axis, T23 is the distance between the second lens and the third lens along the optical axis, and ∑AT is the sum of the air gaps on the optical axis between any two adjacent lenses among the first lens to the fifth lens. The optical imaging lens satisfying 0.7 < (T12 + T23) / ∑AT < 1 is beneficial to correcting the field curvature and aberration of the optical imaging lens, and at the same time ensuring that the distance from the human eye side of the first lens to the image source plane along the optical axis is short, so as to meet the requirements of eyepiece miniaturization.

[0077] In an exemplary embodiment, the optical imaging lens may satisfy -1 < f2 / f1 < -0.3, where f2 is the effective focal length of the second lens and f1 is the effective focal length of the first lens. The optical imaging lens satisfying -1 < f2 / f1 < -0.3 is beneficial to correcting the axial chromatic aberration and improving the sharpness of the image quality in the central region that the human eye pays attention to. More specifically, f2 and f1 satisfy -0.8 < f2 / f1 < -0.4.

[0078] In an exemplary embodiment, the optical imaging lens may satisfy 0.05 < (N1max - N2) / N2 < 0.15, where N1max is the maximum refractive index among the first lens, the second lens and the third lens, and N2 is the refractive index of the second lens. The optical imaging lens satisfying 0.05 < (N1max - N2) / N2 < 0.15 is beneficial to correcting the lateral chromatic aberration in other eye movement ranges by reasonably matching the refractive indices of the first lens, the second lens and the third lens, and ensuring the smoothness of the picture during visual experience.

[0079] In an exemplary embodiment, the optical imaging lens may sequentially include, along the optical axis from the human eye side to the image source side: a first lens group and a second lens group, where the first lens group includes a first lens, a second lens and a third lens, and the second lens group includes a fourth lens and a fifth lens. The first lens has a positive optical power, the second lens has a negative optical power, and at least one of the first lens, the second lens and the third lens is a biconvex lens; the second lens group has a positive optical power, the optical power positive and negative attributes of the fourth lens and the fifth lens are different, and the paraxial part of the image source side of the fifth lens is concave.

[0080] By reasonably distributing the positive and negative optical powers of the first lens group and the second lens group of the optical imaging lens and each lens included in the two lens groups, the spherical aberration and chromatic aberration of the optical imaging lens can be effectively corrected, the modulation transfer function (MTF) of the polychromatic light can be improved, and the common monochromatic trailing phenomenon in visual experience can be avoided.

[0081] In an exemplary embodiment, the optical imaging lens may satisfy 1 < f45 / TD < 3, where f45 is the combined focal length of the fourth lens and the fifth lens, and TD is the on-axis distance from the eye side of the first lens to the image source side of the fifth lens. The optical imaging lens satisfying 1 < f45 / TD < 3 can reasonably control the ratio of the focal length of the rear lens group to the comprehensive ratio of the central thickness and spacing of each lens, which is beneficial to obtaining a larger field of view angle while having a shorter total lens length.

[0082] In an exemplary embodiment, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the image source surface.

[0083] The optical imaging lens according to the above embodiment of the present application may employ multiple lenses, such as the five lenses described above. By reasonably allocating the optical power, surface shape, thickness, maximum field of view angle of the optical imaging lens, entrance pupil diameter of the optical imaging lens, and total effective focal length of the optical imaging lens, etc., the aberration of the optical imaging lens can be corrected, good imaging quality can be obtained, and at the same time, the requirements for miniaturization of the optical imaging lens can be met, so that the optical imaging lens can be used as an eyepiece and can be applied to products such as head-mounted devices. The optical imaging lens according to the embodiment of the present application also has the characteristics of correcting the spherical aberration and chromatic aberration of the optical imaging lens, improving the modulation transfer function (MTF) of the polychromatic light, avoiding the monochromatic trailing phenomenon common in the visual experience, and better improving the performance of the optical lens as an eyepiece.

[0084] In an embodiment of the present application, at least one of the lens surfaces of each lens is an aspherical surface, that is, at least one of the eye side of the first lens to the image source side of the fifth lens is an aspherical surface. The characteristics of the aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from the spherical lens with a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using the aspherical lens, the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the eye side and the image source side of each of the first lens, the second lens, the third lens, and the fifth lens is an aspherical surface. Optionally, both the eye side and the image source side of each of the first lens, the second lens, and the third lens are aspherical surfaces.

[0085] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although five lenses are described as an example in the embodiment, the optical imaging lens is not limited to including five lenses. If necessary, the optical imaging lens may further include other numbers of lenses.

[0086] The following further describes specific embodiments of an optical imaging lens applicable to the above embodiments with reference to the accompanying drawings.

[0087] Example 1

[0088] The following refers to Figures 1 to 2D Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 The structural schematic diagram of the optical imaging lens according to Embodiment 1 of the present application is shown.

[0089] As Figure 1 shown, the optical imaging lens sequentially includes, along the optical axis from the human eye side to the image source side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

[0090] The first lens E1 has a positive optical power, its human eye side S1 is a convex surface, and its image source side S2 is a convex surface. The second lens E2 has a negative optical power, its human eye side S3 is a concave surface, and its image source side S4 is a convex surface. The third lens E3 has a positive optical power, its human eye side S5 is a convex surface, and its image source side S6 is a convex surface. The fourth lens E4 has a positive optical power, its human eye side S7 is a convex surface, and its image source side S8 is a convex surface. The fifth lens E5 has a negative optical power, its human eye side S9 is a concave surface, and its image source side S10 is a concave surface. The filter E6 has a human eye side S11 and an image source side S12, and the optical imaging lens has an image source surface S13.

[0091] Table 1 shows the basic parameter table of the optical imaging lens of Embodiment 1, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0092]

[0093] Table 1

[0094] In Embodiment 1, the total effective focal length f of the optical imaging lens is 13.35 mm, the distance TTL along the optical axis from the human eye side of the first lens to the image source surface is 30.15 mm, half of the diagonal length of the effective pixel region on the image source surface ImgH is 2.98 mm, the maximum field of view FOV of the optical imaging lens is 25.2°, and the aperture value Fno of the optical imaging lens is 1.67.

[0095] In Embodiment 1, the human eye side and the image source side of any one of the first lens E1, 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 formula:

[0096]

[0097] Wherein, x is the sagitta, which is the distance from the vertex of the aspheric surface to the position at height h along the optical axis of the aspheric surface; 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 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 .

[0098] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 8.7581E-05 2.3138E-06 -9.3055E-08 1.4590E-09 -1.7078E-11 1.1404E-13 -2.8995E-16 0.0000E+00 0.0000E+00 S2 -2.9527E-04 1.2434E-05 -1.2051E-07 -9.2568E-10 2.2316E-11 -1.4062E-13 3.2040E-16 0.0000E+00 0.0000E+00 S3 8.2905E-04 -5.8381E-06 -2.1718E-07 9.6049E-09 -1.8645E-10 2.0240E-12 -1.2616E-14 4.2286E-17 -5.8984E-20 S4 2.8412E-04 1.5305E-05 -7.7302E-07 1.6889E-08 -2.1196E-10 1.6084E-12 -7.3186E-15 1.8427E-17 -1.9666E-20 S5 -4.2185E-04 1.3421E-05 -3.0457E-07 4.2547E-09 -3.3969E-11 1.4216E-13 -2.4141E-16 0.0000E+00 0.0000E+00 S6 -2.5245E-04 3.7634E-06 -3.2829E-08 6.3414E-12 2.8208E-12 -1.9669E-14 3.9249E-17 0.0000E+00 0.0000E+00

[0099] Table 2

[0100] Figure 2A shows the axial chromatic aberration curve of the optical imaging lens of Example 1, which represents the deviation of the convergence focal points of light rays of different wavelengths after passing through the lens. Figure 2B shows the astigmatism curve of the optical imaging lens of Example 1, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2C shows the distortion curve of the optical imaging lens of Example 1, which represents the distortion magnitude values corresponding to different image heights. Figure 2D shows the relative illumination curve of the optical imaging lens when the working distance of the optical imaging lens of Example 1 is 1000 mm, which represents the magnitude values of the relative illumination corresponding to different image heights. According to Figures 2A to 2D it can be seen that the optical imaging lens given in Example 1 can achieve good imaging quality.

[0101] Example 2

[0102] The following will refer to Figures 3 to 4D to describe the optical imaging lens according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Example 1 will be omitted. Figure 3 shows a schematic structural diagram of the optical imaging lens according to Embodiment 2 of the present application.

[0103] As Figure 3 shown, the optical imaging lens sequentially includes, along the optical axis from the human eye side to the image source side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

[0104] The first lens E1 has a positive optical power, its eye side S1 is convex, and its image source side S2 is convex. The second lens E2 has a negative optical power, its eye side S3 is concave, and its image source side S4 is concave. The third lens E3 has a positive optical power, its eye side S5 is convex, and its image source side S6 is convex. The fourth lens E4 has a positive optical power, its eye side S7 is convex, and its image source side S8 is concave. The fifth lens E5 has a negative optical power, its eye side S9 is concave, and its image source side S10 is concave. The filter E6 has an eye side S11 and an image source side S12, and the optical imaging lens has an image source surface S13.

[0105] In Embodiment 2, the total effective focal length f of the optical imaging lens is 13.41 mm, the distance TTL along the optical axis from the eye side of the first lens to the image source surface is 29.65 mm, half of the diagonal length of the effective pixel region on the image source surface ImgH is 6.45 mm, the maximum field of view angle FOV of the optical imaging lens is 53.9°, and the aperture number Fno of the optical imaging lens is 1.68.

[0106] Table 3 shows the basic parameter table of the optical imaging lens in Embodiment 2, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 4 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 2, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0107]

[0108] Table 3

[0109] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.7319E-05 -1.8153E-06 2.8091E-08 -4.6389E-10 4.3603E-12 -2.0605E-14 4.0463E-17 0.0000E+00 0.0000E+00 S2 3.0405E-04 -3.0832E-06 -6.2952E-09 3.4831E-10 -3.4654E-12 1.6395E-14 -3.0087E-17 0.0000E+00 0.0000E+00 S3 4.1513E-04 -4.1720E-06 7.8703E-08 -2.1836E-09 3.8838E-11 -4.0108E-13 2.3381E-15 -7.0092E-18 8.1817E-21 S4 -1.6591E-04 3.1729E-06 -5.8488E-08 5.3712E-10 -5.2948E-12 6.3609E-14 -5.6850E-16 2.7369E-18 -5.1969E-21 S5 -1.2721E-05 2.6828E-06 -5.7359E-08 3.0597E-10 1.9255E-12 -2.5251E-14 6.9815E-17 0.0000E+00 0.0000E+00 S6 2.6423E-04 -3.0565E-06 1.0584E-07 -2.4205E-09 2.9297E-11 -1.6838E-13 3.6957E-16 0.0000E+00 0.0000E+00 S9 2.0877E-03 -8.9293E-05 1.9528E-06 -2.6435E-08 2.3392E-10 -1.5778E-12 1.1018E-14 -6.5384E-17 1.7567E-19 S10 1.8255E-03 -1.3012E-05 -5.2139E-06 3.2394E-07 -1.0366E-08 2.0352E-10 -2.4930E-12 1.7768E-14 -5.6658E-17

[0110] Table 4

[0111] Figure 4A Shows the axial chromatic aberration curve of the optical imaging lens in Embodiment 2, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 4B Shows the astigmatism curve of the optical imaging lens in Embodiment 2, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 4C Shows the distortion curve of the optical imaging lens in Embodiment 2, which represents the distortion magnitude values corresponding to different image heights. Figure 4D Shows the relative illumination curve of the optical imaging lens when the working distance of the optical imaging lens in Embodiment 2 is 1000 mm, which represents the magnitude values of the relative illumination corresponding to different image heights. According to Figures 4A to 4D It can be seen that the optical imaging lens given in Embodiment 2 can achieve good imaging quality.

[0112] Example 3

[0113] The following refers toFigures 5 to 6D Describes an optical imaging lens according to Embodiment 3 of the present application. Figure 5 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application.

[0114] As Figure 5 Shown, the optical imaging lens sequentially includes, along the optical axis from the human eye side to the image source side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

[0115] The first lens E1 has a positive optical power, its human eye side S1 is a convex surface, and its image source side S2 is a convex surface. The second lens E2 has a negative optical power, its human eye side S3 is a concave surface, and its image source side S4 is a concave surface. The third lens E3 has a positive optical power, its human eye side S5 is a convex surface, and its image source side S6 is a convex surface. The fourth lens E4 has a positive optical power, its human eye side S7 is a convex surface, and its image source side S8 is a convex surface. The fifth lens E5 has a negative optical power, its human eye side S9 is a concave surface, and its image source side S10 is a concave surface. The filter E6 has a human eye side S11 and an image source side S12, and the optical imaging lens has an image source surface S13.

[0116] In Embodiment 3, the total effective focal length f of the optical imaging lens is 13.19 mm, the distance TTL along the optical axis from the human eye side of the first lens to the image source surface is 29.80 mm, half of the diagonal length of the effective pixel region on the image source surface ImgH is 6.45 mm, the maximum field of view FOV of the optical imaging lens is 54.3°, and the aperture number Fno of the optical imaging lens is 1.65.

[0117] Table 5 shows the basic parameter table of the optical imaging lens of Embodiment 3, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 6 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 3, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0118]

[0119] Table 5

[0120]

[0121]

[0122] Table 6

[0123] Figure 6A Shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 3, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 6BThe astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 6C The distortion curve of the optical imaging lens of Embodiment 3 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 6D The relative illumination curve of the optical imaging lens when the working distance of the optical imaging lens of Embodiment 3 is 1000 mm is shown, which represents the relative illumination magnitude values corresponding to different image heights. According to Figures 6A to 6D It can be seen that the optical imaging lens given in Embodiment 3 can achieve good imaging quality.

[0124] Example 4

[0125] The following refers to Figures 7 to 8D The optical imaging lens according to Embodiment 4 of the present application is described. Figure 7 The structural schematic diagram of the optical imaging lens according to Embodiment 4 of the present application is shown.

[0126] As Figure 7 shown, the optical imaging lens sequentially includes, along the optical axis from the human eye side to the image source side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

[0127] The first lens E1 has a positive optical power, its human eye side S1 is a convex surface, and its image source side S2 is a convex surface. The second lens E2 has a negative optical power, its human eye side S3 is a concave surface, and its image source side S4 is a concave surface. The third lens E3 has a positive optical power, its human eye side S5 is a convex surface, and its image source side S6 is a convex surface. The fourth lens E4 has a positive optical power, its human eye side S7 is a convex surface, and its image source side S8 is a concave surface. The fifth lens E5 has a negative optical power, its human eye side S9 is a concave surface, and its image source side S10 is a concave surface. The filter E6 has a human eye side S11 and an image source side S12, and the optical imaging lens has an image source surface S13.

[0128] In Embodiment 4, the total effective focal length f of the optical imaging lens is 13.18 mm, the distance TTL along the optical axis from the human eye side of the first lens to the image source surface is 29.11 mm, half of the diagonal length of the effective pixel region on the image source surface ImgH is 6.45 mm, the maximum field of view FOV of the optical imaging lens is 54.2°, and the aperture number Fno of the optical imaging lens is 1.65.

[0129] Table 7 shows the basic parameter table of the optical imaging lens of Embodiment 4, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 8 shows the high-order term coefficients that can be used for each aspherical mirror surface in Embodiment 4, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0130]

[0131] Table 7

[0132] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.2283E-05 -2.8456E-06 1.6442E-08 5.7521E-10 -1.4842E-11 1.2628E-13 -3.6330E-16 0.0000E+00 0.0000E+00 S2 5.0301E-04 -1.6220E-05 4.5766E-07 -8.3588E-09 8.4493E-11 -4.4611E-13 9.8098E-16 0.0000E+00 0.0000E+00 S3 5.6224E-04 -1.0169E-05 3.4831E-07 -8.0387E-09 9.2298E-11 -4.3275E-13 -7.8425E-16 1.5088E-17 -3.9719E-20 S4 -4.7382E-04 2.1967E-05 -6.4031E-07 1.1360E-08 -1.3509E-10 1.1008E-12 -5.8782E-15 1.8214E-17 -2.4505E-20 S5 -4.1374E-05 4.7983E-06 -1.2075E-07 1.4678E-09 -8.8537E-12 2.4809E-14 -2.6346E-17 0.0000E+00 0.0000E+00 S6 2.0113E-04 3.4468E-06 -1.4399E-07 2.5534E-09 -2.2729E-11 1.0099E-13 -1.7760E-16 0.0000E+00 0.0000E+00 S9 8.5400E-04 1.4765E-05 -1.5113E-06 2.3305E-08 3.1806E-10 -1.5125E-11 2.0655E-13 -1.2869E-15 3.1169E-18 S10 3.1423E-04 8.2557E-05 -4.7399E-06 1.1236E-07 -2.1439E-09 5.7093E-11 -1.2248E-12 1.3400E-14 -5.5379E-17

[0133] Table 8

[0134] Figure 8A shows the axial chromatic aberration curve of the optical imaging lens of Example 4, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 8B shows the astigmatism curve of the optical imaging lens of Example 4, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8C shows the distortion curve of the optical imaging lens of Example 4, which represents the distortion magnitude values corresponding to different image heights. Figure 8D shows the relative illumination curve of the optical imaging lens when the working distance of the optical imaging lens of Example 4 is 1000 mm, which represents the magnitude values of the relative illumination corresponding to different image heights. According to Figures 8A to 8D it can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0135] Example 5

[0136] The following refers to Figures 9 to 10D describes the optical imaging lens according to Embodiment 5 of the present application. Figure 9 shows a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application.

[0137] As Figure 9 shown, the optical imaging lens sequentially includes, along the optical axis from the human eye side to the image source side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

[0138] The first lens E1 has a positive optical power, its human eye side S1 is a convex surface, and its image source side S2 is a convex surface. The second lens E2 has a negative optical power, its human eye side S3 is a concave surface, and its image source side S4 is a convex surface. The third lens E3 has a positive optical power, its human eye side S5 is a convex surface, and its image source side S6 is a convex surface. The fourth lens E4 has a positive optical power, its human eye side S7 is a convex surface, and its image source side S8 is a convex surface. The fifth lens E5 has a negative optical power, its human eye side S9 is a concave surface, and its image source side S10 is a concave surface. The filter E6 has a human eye side S11 and an image source side S12, and the optical imaging lens has an image source surface S13.

[0139] In Embodiment 5, the total effective focal length f of the optical imaging lens is 13.21 mm, the distance TTL from the human eye side of the first lens to the image source plane along the optical axis is 29.63 mm, half of the diagonal length of the effective pixel area on the image source plane ImgH is 3.54 mm, the maximum field of view angle FOV of the optical imaging lens is 30.1°, and the aperture value Fno of the optical imaging lens is 1.65.

[0140] Table 9 shows the basic parameter table of the optical imaging lens of Embodiment 5, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 10 shows the high-order term coefficients available for each aspherical mirror surface in Embodiment 5, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0141]

[0142]

[0143] Table 9

[0144] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.4831E-05 4.8864E-06 -1.8558E-07 2.7917E-09 -2.4641E-11 1.2159E-13 -2.4529E-16 0.0000E+00 0.0000E+00 S2 -4.6106E-04 1.7407E-05 -2.5104E-07 1.6711E-09 -6.7335E-12 1.9479E-14 -2.0018E-17 0.0000E+00 0.0000E+00 S3 -2.3709E-04 7.2836E-05 -2.7202E-06 5.9822E-08 -8.6773E-10 8.2265E-12 -4.8930E-14 1.6603E-16 -2.4549E-19 S4 5.9155E-04 -2.5179E-05 1.3149E-06 -3.2248E-08 4.3600E-10 -3.5509E-12 1.7456E-14 -4.7743E-17 5.5681E-20 S5 7.4871E-06 -1.0340E-05 1.9194E-07 -7.9352E-10 -9.1258E-12 9.7366E-14 -2.5741E-16 0.0000E+00 0.0000E+00 S6 2.1218E-04 -1.1349E-05 1.7508E-07 -1.3874E-09 6.0352E-12 -9.0183E-15 -1.3530E-17 0.0000E+00 0.0000E+00

[0145] Table 10

[0146] Figure 10A shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 5, which represents the deviation of the convergence focal points of light rays of different wavelengths after passing through the lens. Figure 10B shows the astigmatism curve of the optical imaging lens of Embodiment 5, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 10C shows the distortion curve of the optical imaging lens of Embodiment 5, which represents the distortion magnitude values corresponding to different image heights. Figure 10D shows the relative illumination curve of the optical imaging lens when the working distance of the optical imaging lens of Embodiment 5 is 1000 mm, which represents the magnitude values of the relative illumination corresponding to different image heights. According to Figures 10A to 10D it can be known that the optical imaging lens given in Embodiment 5 can achieve good imaging quality.

[0147] Example 6

[0148] The following refers to Figures 11 to 12D to describe the optical imaging lens according to Embodiment 6 of the present application. Figure 11 shows a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present application.

[0149] As Figure 11 shown, the optical imaging lens sequentially includes, along the optical axis from the human eye side to the image source side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6.

[0150] The first lens E1 has a positive optical power. Its eye side S1 is convex, and its image source side S2 is convex. The second lens E2 has a negative optical power. Its eye side S3 is concave, and its image source side S4 is concave. The third lens E3 has a positive optical power. Its eye side S5 is convex, and its image source side S6 is convex. The fourth lens E4 has a positive optical power. Its eye side S7 is convex, and its image source side S8 is concave. The fifth lens E5 has a negative optical power. Its eye side S9 is concave, and its image source side S10 is concave. The filter E6 has an eye side S11 and an image source side S12, and the optical imaging lens has an image source plane S13.

[0151] In Embodiment 6, the total effective focal length f of the optical imaging lens is 12.97 mm, the distance TTL along the optical axis from the eye side of the first lens to the image source plane is 31.87 mm, half of the diagonal length of the effective pixel region on the image source plane ImgH is 6.60 mm, the maximum field of view angle FOV of the optical imaging lens is 55.9°, and the aperture value Fno of the optical imaging lens is 1.44.

[0152] Table 11 shows the basic parameter table of the optical imaging lens of Embodiment 6, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 12 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 6, where each aspherical surface type can be defined by Formula (1) given in Embodiment 1 above.

[0153]

[0154]

[0155] Table 11

[0156] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.4051E-05 -6.0697E-07 2.8914E-09 -3.6059E-12 0.0000E+00 0.0000E+00 0.0000E+00 3.4051E-05 -6.0697E-07 S2 7.4343E-05 -4.1837E-07 3.8074E-09 -1.2066E-11 0.0000E+00 0.0000E+00 0.0000E+00 7.4343E-05 -4.1837E-07 S3 -4.0479E-05 5.2640E-06 -1.4201E-07 2.2047E-09 -1.9841E-11 9.4175E-14 -1.7938E-16 -4.0479E-05 5.2640E-06 S4 6.8795E-05 -9.7071E-07 -6.9858E-09 1.8447E-10 -1.5169E-12 5.6296E-15 -7.8660E-18 6.8795E-05 -9.7071E-07 S5 1.8262E-05 -6.3078E-07 5.3173E-09 -1.3596E-11 0.0000E+00 0.0000E+00 0.0000E+00 1.8262E-05 -6.3078E-07 S6 1.1126E-04 -5.8158E-07 4.9919E-09 -1.2205E-11 0.0000E+00 0.0000E+00 0.0000E+00 1.1126E-04 -5.8158E-07

[0157] Table 12

[0158] Figure 12A shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 6, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 12B shows the astigmatism curve of the optical imaging lens of Embodiment 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12C shows the distortion curve of the optical imaging lens of Embodiment 6, which represents the distortion magnitude values corresponding to different image heights. Figure 12D shows the relative illumination curve of the optical imaging lens when the working distance of the optical imaging lens of Embodiment 6 is infinity, which represents the relative illumination magnitude values corresponding to different image heights. According to Figures 12A to 12D it can be seen that the optical imaging lens given in Embodiment 6 can achieve good imaging quality.

[0159] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 13.

[0160]

[0161]

[0162] Table 13

[0163] The above description is only the preferred embodiments of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of protection involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the present application. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features having similar functions disclosed in the present application.

Claims

1. An optical imaging lens, characterized in that, It sequentially includes, from the human eye side to the image source side along the optical axis: a first lens group and a second lens group, wherein the first lens group includes a first lens, a second lens, and a third lens, and the second lens group includes a fourth lens and a fifth lens. Each lens has a human eye side facing the human eye and an image source side facing the image source. The first lens has a positive optical power, the second lens has a negative optical power, the third lens has a positive optical power. Both the first lens and the third lens are biconvex lenses, and the paraxial part of the human eye side of the second lens is concave. The second lens group has a positive optical power, the fourth lens has a positive optical power, the fifth lens has a negative optical power. The paraxial part of the human eye side of the fourth lens is convex, and the paraxial part of the human eye side of the fifth lens is concave, and the paraxial part of the image source side is concave. The number of lenses with optical power in the optical imaging lens is five. The maximum field of view FOV, the entrance pupil diameter EPD, and the total effective focal length f of the optical imaging lens satisfy: 0.35 < tan(FOV / 2) * EPD / f ≤ 0.85; and The combined focal length f45 of the fourth lens and the fifth lens and the axial distance TD from the human eye side of the first lens to the image source side of the fifth lens satisfy: 1.28 ≤ f45 / TD ≤ 2.48; The maximum effective semi-aperture DT32 of the image source side of the third lens and the maximum effective semi-aperture DT41 of the human eye side of the fourth lens satisfy: 1 < DT32 / DT41 < 1.

2.

2. The optical imaging lens according to claim 1, wherein The maximum refractive index N1max among the first lens, the second lens, and the third lens and the maximum refractive index N2max among the fourth lens and the fifth lens satisfy: N2max > N1max, where 1.95 ≤ N2max ≤ 2.

01.

3. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R7 of the human eye side of the fourth lens and the radius of curvature R10 of the image source side of the fifth lens satisfy: 0.80 ≤ R7 / R10 < 1.

0.

4. The optical imaging lens according to claim 1, wherein The radius of curvature R10 of the image source side of the fifth lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.29 ≤ R10 / f45 < 0.

6.

5. The optical imaging lens according to claim 1, characterized in that, The central thickness CT2 of the second lens and the central thickness CT4 of the fourth lens satisfy: 0.18 ≤ CT2 / CT4 < 0.

6.

6. The optical imaging lens according to any one of claims 1-5, characterized in that, The maximum value DTmax of the maximum effective semi-aperture from the human eye side of the first lens to the image source side of the fifth lens and the axial distance TD from the human eye side of the first lens to the image source side of the fifth lens satisfy: 0.45 ≤ DTmax / TD < 0.

5.

7. The optical imaging lens according to claim 1, characterized in that, The edge thickness ET3 of the third lens at the maximum effective semi-aperture and the edge thickness ET2 of the second lens at the maximum effective semi-aperture satisfy: 0.19 ≤ ET3 / ET2 ≤ 0.

41.

8. The optical imaging lens according to any one of claims 1-5, characterized in that, The central thickness CT4 of the fourth lens, the central thickness CT5 of the fifth lens, the edge thickness ET4 of the fourth lens at the maximum effective semi-aperture, and the edge thickness ET5 of the fifth lens at the maximum effective semi-aperture satisfy: 1.3 ≤ (CT4 + CT5) / (ET4 + ET5) < 1.

6.

9. The optical imaging lens according to any one of claims 1-5, characterized in that, The on-axis distance Tr1r6 from the eye side of the first lens to the image source side of the third lens, the central thickness CT4 of the fourth lens, the spacing distance T45 between the fourth lens and the fifth lens along the optical axis, and the central thickness CT5 of the fifth lens satisfy: 0.35 ≤ (CT4 + T45 + CT5) / Tr1r6 ≤ 0.

64.

10. The optical imaging lens according to any one of claims 1-5, characterized in that, The maximum effective semi-aperture DT12 of the image source side of the first lens and the maximum effective semi-aperture DT21 of the eye side of the second lens satisfy: 0.99 ≤ DT12 / DT21 ≤ 1.

01.

11. The optical imaging lens according to any one of claims 1-5, characterized in that, The sum ∑ET of the edge thicknesses of the first lens to the fifth lens at the maximum effective semi-aperture and the sum ∑CT of the central thicknesses of the first lens to the fifth lens satisfy: 0.69 ≤ ∑ET / ∑CT < 0.

8.

12. The optical imaging lens according to any one of claims 1-5, characterized in that, The spacing distance T12 between the first lens and the second lens along the optical axis, the spacing distance T23 between the second lens and the third lens along the optical axis, and the sum ∑AT of the air gaps on the optical axis between any two adjacent lenses among the first lens to the fifth lens satisfy: 0.7 < (T12 + T23) / ∑AT < 1.

13. The optical imaging lens according to claim 1, characterized in that, The effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy: -0.72 ≤ f2 / f1 < -0.

4.

14. The optical imaging lens according to any one of claims 1-5, characterized in that, The maximum refractive index N1max among the first lens, the second lens, and the third lens and the refractive index N2 of the second lens satisfy: 0.08 ≤ (N1max - N2) / N2 ≤ 0.13.

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