Optical imaging lens

Abstract

The application discloses an optical imaging lens, which is composed of a lens barrel, a lens group and a plurality of spacer elements accommodated in the lens barrel. The lens barrel has an eye side end facing a human eye and an image source side end facing an image source. The lens group comprises, in sequence along an optical axis from the eye side to the image source side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens. At least one surface of at least one lens among the first lens to the fifth lens is aspherical. The first lens, the second lens and the third lens form a first lens group, and the fourth lens and the fifth lens form a second lens group with positive refractive power. The on-axis distance between any two adjacent lenses in the first lens group is greater than the on-axis distance between two lenses in the second lens group. The on-axis distance TD from the eye side surface of the first lens to the image source side surface of the fifth lens, the maximum height L of the lens barrel extending in the direction of the optical axis, the outer diameter D0s of the eye side end of the lens barrel and the outer diameter D0m of the image source side end of the lens barrel satisfy the condition: |TD / L-D0s / D0m|<1.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical imaging lens. Background Technology

[0002] With the rapid development of optoelectronic technology, the application scenarios of lenses are also showing diversified demands. These demands include different lens types, varying application environments, and the need for lenses to maintain stable performance and image quality under different temperatures. Virtual Reality (VR) is a computer simulation system that can create and experience virtual worlds. It uses computers to generate a simulated environment, a multi-dimensional, interactive, dynamic three-dimensional visual and physical behavior system simulation that immerses the user in a virtual world. However, existing virtual reality display devices are bulky and inconvenient to carry, severely impacting the user experience. This is one of the reasons why VR has not yet been widely accepted.

[0003] An optical imaging lens can include a lens barrel, a lens group housed within the lens barrel, and multiple spacer elements. It can be used as a display eyepiece, which is a core optical component of VR headsets. The eyepiece's imaging quality, weight, size, and other key indicators directly affect the user's experience and comfort when wearing a VR headset. Therefore, miniaturization of the eyepiece is an important trend in the development of VR headsets. On the other hand, with the advancement of display technology, higher demands are being placed on the imaging quality of the matching eyepieces. To meet these higher market requirements, it is necessary to increase the number of lenses in the eyepiece to ensure high-quality imaging. However, with the increase in the number of lenses, the assembly efficiency of the eyepiece and the stability of the overall structure after assembly also need to be further improved. Therefore, how to ensure that VR headsets are miniaturized and have good imaging quality while also being easy to assemble and stable is one of the urgent problems to be solved in this field. Summary of the Invention

[0004] This application provides an optical imaging lens comprising a lens barrel, a lens group housed within the lens barrel, and a plurality of spacer elements. The lens barrel has an eye-side end facing the human eye and an image-source end facing the image source. The lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis from the eye-side to the image-source side. At least one surface of at least one of the first to fifth lenses is aspherical. The first lens, the second lens, and the third lens constitute the first... The lens group, wherein the fourth lens and the fifth lens form a second lens group with positive optical power, wherein the axial distance between any two adjacent lenses in the first lens group is greater than the axial distance between two lenses in the second lens group; the lens group and the plurality of spacers are housed in the lens barrel, wherein the axial distance TD from the eye side of the first lens to the image source side of the fifth lens, the maximum height L of the lens barrel extending along the optical axis, the outer diameter D0s of the eye side end of the lens barrel, and the outer diameter D0m of the image source side end of the lens barrel satisfy: |TD / L-D0s / D0m|<1.

[0005] In one embodiment, the plurality of spacer elements includes a second spacer element disposed on the image source side of the second lens, wherein the image source side of the second lens is in contact with the eye-side side of the second spacer element, wherein the radius of curvature R3 of the eye-side side of the second lens, the center thickness CT2 of the second lens, the axial distance T23 from the second lens to the third lens, the inner diameter d2s of the eye-side side of the second spacer element, the inner diameter d2m of the image source side of the second spacer element, and the radius of curvature R4 of the image source side of the second lens satisfy: -3mm -1 <(R3 / CT2+R4 / T23) / (d2s+d2m)<5mm -1 .

[0006] In one embodiment, the plurality of spacer elements includes at least one spacer element disposed between the second lens and the third lens, wherein the radius of curvature R4 of the image source side of the second lens, the radius of curvature R5 of the human eye side of the third lens, the axial distance T23 between the second lens and the third lens, and the sum of the maximum thickness of each of the at least one spacer element ∑CP2 satisfy: 0<|R4 / R5|+(∑CP2 / T23)<25.

[0007] In one embodiment, the plurality of spacer elements between the first lens and the fourth lens include at least two spacer elements disposed between adjacent lenses in the first lens to the fourth lens, the at least two spacer elements being fixedly bonded to each other by adhesive.

[0008] In one embodiment, the eye-side surface of the first lens is convex, the image-source surface of the third lens is concave, and the image-source surface of the fifth lens is concave.

[0009] In one embodiment, the center thickness CT1 of the first lens, the axial distance T12 from the first lens to the second lens, the center thickness CT2 of the second lens, the axial distance T23 from the second lens to the third lens, the center thickness CT3 of the third lens, the radius of curvature R6 of the image source side of the third lens, the radius of curvature R1 of the human eye side of the first lens, and the maximum height L of the lens barrel extending along the optical axis satisfy: -2<(CT1+T12+CT2+T23+CT3)*(R1 / R6) / L<0.

[0010] In one embodiment, the radius of curvature R1 of the eye-side side of the first lens, the radius of curvature R10 of the image-source side of the fifth lens, the outer diameter D0s of the eye-side end of the lens barrel, the inner diameter d0s of the eye-side end of the lens barrel, the outer diameter D0m of the image-source side end of the lens barrel, and the inner diameter d0m of the image-source side end of the lens barrel satisfy: 0 <R1 / R10*|D0s-d0s| / |D0m-d0m|<10。

[0011] In one embodiment, the sum of the maximum thicknesses of each of the plurality of spacers, ∑CP, the sum of the spacings between any two adjacent lenses from the first lens to the fifth lens on the optical axis, ∑AT, the sum of the center thicknesses of the first lens to the fifth lens, ∑CT, and the maximum height L of the lens barrel extending along the optical axis satisfy: 1 ​​< ∑CP / ∑AT + ∑CT / L < 5.

[0012] In one embodiment, the third lens is a biconvex lens, and the axial distance T34 between the third lens and the fourth lens, the radius of curvature R6 of the image source side of the third lens, the radius of curvature R7 of the human eye side of the fourth lens, and the maximum height L of the lens barrel extending along the optical axis satisfy: -2 <T34 / L-|R6 / R7|<0。

[0013] In one embodiment, in the lens group, at least one of the first to the fifth lenses is a glass lens, and at least one of the human eye side and the image source side of the glass lens is a glass aspherical surface.

[0014] In one embodiment, the refractive index n1 of the first lens, the refractive index n2 of the second lens, the refractive index n3 of the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, the central thickness CT3 of the third lens, and the maximum height L of the lens barrel extending along the optical axis satisfy: 1 < 2*n3 / (n1 + n2) + (CT1 + CT2 + CT3) / L < 2.

[0015] In one embodiment, the refractive index n4 of the fourth lens, the refractive index n5 of the fifth lens, the central thickness CT4 of the fourth lens, the central thickness CT5 of the fifth lens, and the maximum height L of the lens barrel extending along the optical axis satisfy: 0 < (n4 - 1.8) / (n4 - n5) + (L - CT4) / (L - CT5) < 5.

[0016] In one embodiment, the outer diameter D0s of the human eye side end of the lens barrel, the outer diameter D0m of the image source side end of the lens barrel, the aperture value Fno of the optical imaging lens, the total effective focal length f of the optical imaging lens, and the maximum height L of the lens barrel extending along the optical axis satisfy: 0 mm < max(D0s, D0m)*L / (Fno*f) < 55 mm, where max(D0s, D0m) refers to the maximum value between D0s and D0m.

[0017] In one embodiment, the combined focal length f45 of the fourth lens and the fifth lens and the inner diameter d0m of the image source side end of the lens barrel satisfy: 1 < f45 / d0m < 5.

[0018] In one embodiment, the outer diameter D2s of the human eye side surface of the second spacer element, the inner diameter d2s of the human eye side surface of the second spacer element, the outer diameter D2m of the image source side surface of the second spacer element, the inner diameter d2m of the image source side surface of the second spacer element, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy:

[0019] -10 < (D2s - d2s) / (D2m - d2m)*(f2 - f3) / (f2 + f3) < -5.

[0020] In one embodiment, the connection method of one of the first lens and the fifth lens to the lens barrel is direct abutment, and the connection method of the other lens to the lens barrel is glue fixing or retaining ring fixing.

[0021] In another aspect, this application provides an optical imaging lens comprising a lens barrel, a lens group housed within the lens barrel, and a plurality of spacer elements. The lens barrel has an eye-side end facing the human eye and an image-source end facing the image source. The lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis from the eye-side to the image-source side. At least one surface of at least one of the first to fifth lenses is aspherical, wherein the eye-side surface of the first lens is convex, and the image-source surface of the third lens is concave. In the first lens to the fifth lens, at least one lens is a glass lens, and at least one of the human eye side and the image source side of the glass lens is a glass aspherical surface; and the refractive index n1 of the first lens, the refractive index n2 of the second lens, the refractive index n3 of the third lens, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, the center thickness CT3 of the third lens, and the maximum height L of the lens barrel extending along the optical axis satisfy: 1<2*n3 / (n1+n2)+(CT1+CT2+CT3) / L<2.

[0022] In one embodiment, the plurality of spacer elements includes a second spacer element disposed on the image source side of the second lens, wherein the image source side of the second lens is in contact with the eye-side side of the second spacer element, wherein the radius of curvature R3 of the eye-side side of the second lens, the center thickness CT2 of the second lens, the axial distance T23 from the second lens to the third lens, the inner diameter d2s of the eye-side side of the second spacer element, the inner diameter d2m of the image source side of the second spacer element, and the radius of curvature R4 of the image source side of the second lens satisfy: -3mm -1 <(R3 / CT2+R4 / T23) / (d2s+d2m)<5mm -1 .

[0023] In one embodiment, the plurality of spacer elements includes at least one spacer element disposed between the second lens and the third lens, wherein the radius of curvature R4 of the image source side of the second lens, the radius of curvature R5 of the human eye side of the third lens, the axial distance T23 between the second lens and the third lens, and the sum of the maximum thickness of each of the at least one spacer element ∑CP2 satisfy: 0<|R4 / R5|+(∑CP2 / T23)<25.

[0024] In one embodiment, the plurality of spacer elements between the first lens and the fourth lens include at least two spacer elements disposed between adjacent lenses in the first lens to the fourth lens, the at least two spacer elements being fixedly bonded to each other by adhesive.

[0025] In one embodiment, the eye-side surface of the first lens is convex, the image-source surface of the third lens is concave, and the image-source surface of the fifth lens is concave.

[0026] In one embodiment, the center thickness CT1 of the first lens, the axial distance T12 from the first lens to the second lens, the center thickness CT2 of the second lens, the axial distance T23 from the second lens to the third lens, the center thickness CT3 of the third lens, the radius of curvature R6 of the image source side of the third lens, the radius of curvature R1 of the human eye side of the first lens, and the maximum height L of the lens barrel extending along the optical axis satisfy: -2<(CT1+T12+CT2+T23+CT3)*(R1 / R6) / L<0.

[0027] In one embodiment, the radius of curvature R1 of the eye-side side of the first lens, the radius of curvature R10 of the image-source side of the fifth lens, the outer diameter D0s of the eye-side end of the lens barrel, the inner diameter d0s of the eye-side end of the lens barrel, the outer diameter D0m of the image-source side end of the lens barrel, and the inner diameter d0m of the image-source side end of the lens barrel satisfy: 0 <R1 / R10*|D0s-d0s| / |D0m-d0m|<10。

[0028] In one embodiment, the sum of the maximum thicknesses of each of the plurality of spacers, ∑CP, the sum of the spacings between any two adjacent lenses from the first lens to the fifth lens on the optical axis, ∑AT, the sum of the center thicknesses of the first lens to the fifth lens, ∑CT, and the maximum height L of the lens barrel extending along the optical axis satisfy: 1 ​​< ∑CP / ∑AT + ∑CT / L < 5.

[0029] In one embodiment, the third lens is a biconvex lens, and the axial distance T34 between the third lens and the fourth lens, the radius of curvature R6 of the image source side of the third lens, the radius of curvature R7 of the human eye side of the fourth lens, and the maximum height L of the lens barrel extending along the optical axis satisfy: -2 <T34 / L-|R6 / R7|<0。

[0030] In one embodiment, the refractive index n4 of the fourth lens, the refractive index n5 of the fifth lens, the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, and the maximum height L of the lens barrel extending along the optical axis satisfy: 0 < (n4 - 1.8) / (n4 - n5) + (L - CT4) / (L - CT5) < 5.

[0031] In one embodiment, the outer diameter D0s of the human eye side end of the lens barrel, the outer diameter D0m of the image source side end of the lens barrel, the aperture value Fno of the optical imaging lens, the total effective focal length f of the optical imaging lens, and the maximum height L of the lens barrel extending along the optical axis satisfy: 0 mm < max(D0s, D0m) * L / (Fno * f) < 55 mm, where max(D0s, D0m) refers to the maximum value between D0s and D0m.

[0032] In one embodiment, the combined focal length f45 of the fourth lens and the fifth lens and the inner diameter d0m of the image source side end of the lens barrel satisfy: 1 < f45 / d0m < 5.

[0033] In one embodiment, the outer diameter D2s of the human eye side surface of the second spacer element, the inner diameter d2s of the human eye side surface of the second spacer element, the outer diameter D2m of the image source side surface of the second spacer element, the inner diameter d2m of the image source side surface of the second spacer element, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -10 < (D2s - d2s) / (D2m - d2m) * (f2 - f3) / (f2 + f3) < -5.

[0034] In one embodiment, one of the first lens and the fifth lens is directly abutted against the lens barrel, and the other lens is fixed by dispensing or pressing ring to the lens barrel.

[0035] The optical imaging lens of the present application is composed of a lens barrel, a lens group and a plurality of spacer elements accommodated in the lens barrel. The lens group includes a first lens group and a second lens group. The first lens group includes a first lens, a second lens and a third lens. The second lens group includes a fourth lens and a fifth lens. By reasonably distributing the optical power of the second lens group, the axial distance between any two adjacent lenses in the first lens group, the axial distance between the two lenses in the second lens group, the axial distance from the human eye side surface of the first lens to the image source side surface of the fifth lens, the maximum height of the lens barrel extending along the optical axis, the outer diameter D0s of the human eye side end of the lens barrel, and the outer diameter of the image source side end of the lens barrel, the assembly efficiency and structural stability of the above optical imaging lens can be improved. While ensuring the compact structure of the optical imaging lens, the reliability of the optical imaging lens is improved, the imaging quality is effectively improved, and the market competitiveness of the optical imaging lens product is greatly enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] By reading the detailed description of the non-restrictive embodiments made with reference to the following drawings, other features, objects and advantages of the present application will become more obvious:

[0037] Figure 1AA schematic diagram of the lens group in an optical imaging lens according to Embodiment 1 of this application is shown;

[0038] Figures 1B to 1D Schematic diagrams of the lens barrel and various spacer elements under three different implementations of the optical imaging system of Embodiment 1 are shown respectively.

[0039] Figures 2A to 2D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and relative illumination curve of the optical imaging lens of Example 1 are shown respectively.

[0040] Figure 3A A schematic diagram of the lens group in an optical imaging lens according to Embodiment 2 of this application is shown;

[0041] Figures 3B to 3D Schematic diagrams of the lens barrel and various spacer elements under three different implementations of the optical imaging system of Embodiment 2 are shown respectively.

[0042] Figures 4A to 4D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and relative illumination curve of the optical imaging system of Example 2 are shown respectively.

[0043] Figure 5A A schematic diagram of the lens group in an optical imaging lens according to Embodiment 3 of this application is shown;

[0044] Figures 5B to 5D Schematic diagrams of the lens barrel and various spacer elements under three different implementations of the optical imaging system of Embodiment 3 are shown respectively.

[0045] Figures 6A to 6D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and relative illumination curve of the optical imaging system of Example 3 are shown respectively; and

[0046] Figure 7A and Figure 7B A schematic diagram showing partial parameters of an optical imaging system according to an embodiment of this application is provided, wherein, Figure 7B yes Figure 7A A magnified view of part A in the diagram. Detailed Implementation

[0047] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this 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.

[0048] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0049] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0050] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject is called the near-eye side of the lens, and the surface of each lens closest to the image source surface is called the near-image source side of the lens.

[0051] It should also be understood that the terms "comprising," "including," "having," "containing," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0052] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0053] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] The features, principles and other aspects of this application are described in detail below.

[0055] An optical imaging lens according to an exemplary embodiment of this application may include two lens groups, such as a first lens group and a second lens group. 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. These five lenses are arranged sequentially along the optical axis from the human eye side to the image source side. Each lens has a human eye side facing the human eye and an image source side facing the image source side, and at least one surface of at least one lens is aspherical. In the first to fifth lenses, any two adjacent lenses can have an air gap in the on-axis region, which is beneficial to effectively improve the temperature drift problem of the optical imaging lens and effectively expand the application scenarios of the optical imaging lens. The second lens group has positive optical power, and the on-axis distance between any two adjacent lenses in the first lens group is greater than the on-axis distance between two lenses in the second lens group. Through the reasonable matching of the optical power and lens spacing of the two lens groups, it is beneficial to improve the assembly efficiency and structural stability of the lens group, spacer element, and lens barrel. While ensuring the compact structure of the optical imaging lens, it enhances the reliability of the optical imaging lens and greatly improves the market competitiveness of the optical imaging lens product.

[0056] According to an exemplary embodiment of this application, each of the first to fifth lenses may have an optical region for optical imaging and a non-optical region extending outward from the outer periphery of the optical region. Generally speaking, the optical region refers to the area of ​​the lens used for optical imaging, while the non-optical region is the structural area of ​​the lens. During the assembly of the optical imaging system, spacer elements can be set at the non-optical regions of each lens using processes such as adhesive bonding, and each lens can be connected to the lens barrel respectively. During the imaging process of the optical imaging lens, the optical regions of each lens can transmit light from the object to form an optical path, forming the final optical image; while the non-optical regions of each assembled lens are housed in the lens barrel, which cannot transmit light, thus the non-optical regions do not directly participate in the imaging process of the optical imaging lens. It should be noted that, for ease of description, this application describes each lens as divided into two parts: an optical region and a non-optical region. However, it should be understood that the optical region and the non-optical region of the lens can be formed as a whole during the manufacturing process, rather than as two separate parts.

[0057] An optical imaging lens according to an exemplary embodiment of this application may include a plurality of spacer elements, each spacer element having an eye-side facing the human eye and an image-source side facing the image-source side, wherein the eye-side and image-source side of each spacer element may contact non-optical regions of the image-source side and eye-side of two adjacent lenses. Exemplarily, as... Figure 1B As shown, the eye-side of the first spacer element P1 contacts the non-optical area of ​​the image source side of the first lens, and the image source side of the first spacer element P1 contacts the non-optical area of ​​the eye-side of the second lens. By adding spacer elements between the lenses while ensuring a proper assembly sequence, light rays outside the optical area can be effectively blocked, thus significantly improving image quality.

[0058] An optical imaging lens according to an exemplary embodiment of this application may include a lens barrel housing a first to a fifth lens. For example, as... Figures 1B to 3B As shown, the lens barrel P0 can be a one-piece lens barrel or a separate lens barrel. The optical imaging lens may include multiple spacer elements.

[0059] According to an exemplary embodiment of this application, at least two spacer elements are provided between at least two adjacent lenses between the first to fourth lenses, and the spacer elements between two adjacent lenses are fixedly bonded to each other with adhesive. By providing at least two spacer elements, the light transmission of the optical imaging lens can be effectively controlled, and a wider spacing for fixing and support can be achieved, effectively blocking more invalid light rays and reducing the risk of stray light while ensuring sufficient light transmission.

[0060] According to an exemplary embodiment of this application, the eye-side of the first lens is convex, which can ensure that the optical imaging lens can better and more effectively acquire external light, and has the advantages of being aesthetically pleasing, waterproof, dustproof and scratch-resistant; the image source side of the third lens is concave, and the image source side of the fifth lens is concave, which is beneficial to change the light path of the light and the position of the light in the final imaging area, thereby improving the imaging quality and effectively enhancing the imaging level.

[0061] According to an exemplary embodiment of this application, the optical imaging lens can satisfy |TD / L-D0s / D0m|<1, where TD is the axial distance from the eye-side side of the first lens to the image-source side of the fifth lens, and L is the maximum height of the lens barrel extending along the optical axis. Figure 7A As shown, D0s is the outer diameter of the lens barrel at the eye-side end, and D0m is the outer diameter of the lens barrel at the image source-side end. An optical imaging lens that satisfies |TD / L - D0s / D0m| < 1 is beneficial for controlling the rear end size of a large image sensor lens and the height of the lens barrel, ensuring a balance in size at both ends of the lens, and limiting the overall height of the lens barrel, thus contributing to the ultra-thin and miniaturized characteristics of the lens. More specifically, TD, L, D0s, and D0m can satisfy: 0 < |TD / L - D0s / D0m| < 1.

[0062] According to an exemplary embodiment of this application, a second spacer element is provided on the image source side of the second lens. The second spacer element has an eye-side facing the human eye and an image source side facing the image source side. The image source side of the second lens and the eye-side of the second spacer element are in contact with each other, and the optical imaging lens can meet the requirement of -3mm. -1 <(R3 / CT2+R4 / T23) / (d2s+d2m)<5mm -1 Where R3 is the radius of curvature of the second lens on the eye side, CT2 is the center thickness of the second lens, T23 is the axial distance between the second and third lenses, and d2s is the inner diameter of the second spacer element on the eye side (see details). Figure 7B ), d2m is the inner diameter of the image source side of the second spacer element (see details). Figure 7B R4 is the radius of curvature of the image source side of the second lens. The optical imaging lens satisfies -3mm. -1 <(R3 / CT2+R4 / T23) / (d2s+d2m)<5mm -1 A second spacer element is provided on the image source side of the second lens to prevent invalid light from passing through, which helps to reduce the impact of stray light on image quality, thereby ensuring optimal performance and best image quality.

[0063] According to an exemplary embodiment of the present application, a plurality of spacer elements include at least one spacer element disposed between the second lens and the third lens. The optical imaging lens can satisfy 0 < |R4 / R5| + (∑CP2 / T23) < 25, where R4 is the radius of curvature of the image source side of the second lens, R5 is the radius of curvature of the eye side of the third lens, ∑CP2 is the total maximum thickness of each spacer element in at least one spacer element, and the direction of the maximum thickness is the direction of the optical axis, T23 is the on-axis distance from the second lens to the third lens, and d2s is the inner diameter of the eye side of the second spacer element. The optical imaging lens satisfies 0 < |R4 / R5| + (∑CP2 / T23) < 25. By matching the radius of curvature of the eye side and the image source side of the second lens, a better optical path for light can be obtained. At the same time, defining the axial thickness of the spacer element between the second lens and the third lens is beneficial for adjusting the field curvature, thereby obtaining better optical performance, improving the production yield, and reducing costs.

[0064] According to an exemplary embodiment of the present application, the optical imaging lens can satisfy -2 < (CT1 + T12 + CT2 + T23 + CT3) * (R1 / R6) / L < 0, where CT1 is the central thickness of the first lens, T12 is the on-axis distance from the first lens to the second lens, CT2 is the central thickness of the second lens, T23 is the on-axis distance from the second lens to the third lens, CT3 is the central thickness of the third lens, R6 is the radius of curvature of the image source side of the third lens, R1 is the radius of curvature of the eye side of the first lens, and L is the maximum height of the lens barrel extending along the optical axis. The optical imaging lens satisfies -2 < (CT1 + T12 + CT2 + T23 + CT3) * (R1 / R6) / L < 0. By adjusting the central thickness and gaps of the first lens to the third lens, it is beneficial to change the length of light in any two adjacent lenses from the first to the third lens. At the same time, reasonably setting the ratio of the radius of curvature of the eye side of the first lens, the radius of curvature of the image source side of the third lens, and the length of the lens barrel is beneficial for correcting the field curvature aberration of the off-axis field, achieving the purpose of optimizing the optical performance, and ensuring a smaller size of the optical imaging lens. More specifically, CT1, T12, CT2, T23, CT, R1, R6, and L can satisfy: -1.2 < (CT1 + T12 + CT2 + T23 + CT3) * (R1 / R6) / L < -0.5.

[0065] According to an exemplary embodiment of the present application, the optical imaging lens can satisfy 0 < R1 / R10 * |D0s - d0s| / |D0m - d0m| < 10, where R1 is the radius of curvature of the eye side of the first lens, R10 is the radius of curvature of the image source side of the fifth lens, as Figure 7AAs shown, D0s is the outer diameter of the eyepiece side end of the lens barrel, D0m is the outer diameter of the image source side end of the lens barrel, d0s is the inner diameter of the eyepiece side end of the lens barrel, and d0m is the inner diameter of the image source side end of the lens barrel. The optical imaging lens satisfies 0 < R1 / R10 * |D0s - d0s| / |D0m - d0m| < 10. By reasonably setting the inner diameter of the eyepiece side end of the lens barrel, the first lens cooperating with the lens barrel can obtain the optimal bearing length, effectively improving the fixing firmness of the first lens, the fifth lens and the lens barrel, and effectively improving the reliability of the optical imaging lens; reasonably setting the inner diameter of the image source side end of the lens barrel can obtain a reasonable and sufficient space for dispensing, which can also effectively improve the reliability of the lens barrel. At the same time, reasonably configuring the outer diameter of the lens barrel can reduce the uneven wall thickness of the lens barrel, avoiding appearance problems or molding problems. More specifically, R1, R10, D0s, d0s, D0m and d0m can satisfy: 0 < R1 / R10 * |D0s - d0s| / |D0m - d0m| < 8.

[0066] According to an exemplary embodiment of the present application, the optical imaging lens can satisfy 1 < ∑CP / ∑AT + ∑CT / L < 5, where ∑CP is the sum of the maximum thicknesses of each spacer element among multiple spacer elements, and the direction of the maximum thickness is the direction of the optical axis; ∑AT is the sum of the intervals on the optical axis between any two adjacent lenses from the first lens to the fifth lens; ∑CT is the sum of the central thicknesses of the first lens to the fifth lens; and L is the maximum height of the lens barrel extending along the direction of the optical axis. The optical imaging lens satisfying 1 < ∑CP / ∑AT + ∑CT / L < 5 is beneficial to controlling the axial dimensions of each lens and spacer element, ensuring that the lenses and spacer elements are all accommodated within the lens barrel, and effectively preventing the loss of the yield rate during the lens assembly process due to the protrusion of the lens and the scratch caused by the protrusion of the lens, thereby affecting the optical imaging system and normal use of the optical imaging lens.

[0067] According to an exemplary embodiment of the present application, the third lens is a biconvex lens, and the optical imaging lens can satisfy -2 < T34 / L - |R6 / R7| < 0, where T34 is the on-axis distance from the third lens to the fourth lens, L is the maximum height of the lens barrel extending along the direction of the optical axis, R6 is the radius of curvature of the image source side surface of the third lens, and R7 is the radius of curvature of the eyepiece side surface of the fourth lens. The optical imaging lens satisfying -2 < T34 / L - |R6 / R7| < 0, by specifying that both the eyepiece side surface and the image source side surface of the third lens are convex surfaces, enables the third lens to converge light well. At the same time, by reasonably setting the on-axis distance between the third lens and the fourth lens, the overall structural height dimension of the lens barrel can be effectively controlled, achieving the purpose of minimizing the lens volume and making the mass lighter while ensuring the performance of the optical imaging lens. More specifically, T34, L, R6 and R7 can satisfy: -1.5 < T34 / L - |R6 / R7| < -0.5.

[0068] According to an exemplary embodiment of the present application, the material of at least one of the first lens to the fifth lens is glass, and at least one of the human eye side and the image source side of the glass lens is an aspherical surface. By reasonably increasing the number of glass lenses, especially aspherical glass lenses, the temperature drift problem of the optical imaging lens can be effectively improved. At the same time, the combination of aspherical glass surfaces can increase the design freedom of the lens. Under the same conditions, it helps to improve the performance of the optical imaging lens.

[0069] According to an exemplary embodiment of the present application, the optical imaging lens can satisfy 1 < 2*n3 / (n1 + n2) + (CT1 + CT2 + CT3) / L < 2, where n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, CT1 is the central thickness of the first lens, CT2 is the central thickness of the second lens, CT3 is the central thickness of the third lens, and L is the maximum height of the lens barrel extending along the optical axis. The optical imaging lens satisfies 1 < 2*n3 / (n1 + n2) + (CT1 + CT2 + CT3) / L < 2. By adjusting the central thickness and refractive index combination of the first to third lenses, it is beneficial to correct the lateral chromatic aberration in other eye movement ranges, ensure the smoothness of the picture during visual experience, enable the optical imaging lens to obtain better imaging quality, and effectively control the height dimension of the optical imaging lens and reduce the processing difficulty of the later lenses, thereby reducing costs and improving the competitiveness of the product in the market.

[0070] According to an exemplary embodiment of the present application, the optical imaging lens can satisfy 0 < (n4 - 1.8) / (n4 - n5) + (L - CT4) / (L - CT5) < 5, where n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, CT4 is the central thickness of the fourth lens, CT5 is the central thickness of the fifth lens, and L is the maximum height of the lens barrel extending along the optical axis. The optical imaging lens satisfies 0 < (n4 - 1.8) / (n4 - n5) + (L - CT4) / (L - CT5) < 5. By reasonably configuring the materials and refractive indices of the fourth lens and the fifth lens, and at the same time coordinating the configuration of the lens thickness and the lens barrel length, it is beneficial to correct the coma aberration of the off-axis field of view. The proportion of the lens thickness accommodated in the rear section of the lens barrel is reasonable, which is conducive to obtaining good edge picture clarity, improving the imaging effect and improving the assembly yield.

[0071] According to an exemplary embodiment of the present application, the optical imaging lens can satisfy 0mm < max(D0s, D0m)*L / (Fno*f) < 55mm, where D0s is the outer diameter of the human eye side end of the lens barrel (see Figure 7A ) and D0m is the outer diameter of the image source side end of the lens barrel (see Figure 7A), where Fno is the aperture value of the optical imaging lens, f is the total effective focal length of the optical imaging lens, L is the maximum height of the lens barrel extending along the optical axis, and max(D0s, D0m) refers to the maximum value between D0s and D0m. The optical imaging lens satisfies 0 mm < max(D0s, D0m) * L / (Fno * f) < 55 mm. By setting the outer diameters of the human eye side end and the image source side end of the lens barrel, the size of the lens in the radial direction is controlled, and at the same time, the size of the overall structure of the lens barrel in the axial direction is controlled, which is beneficial to the miniaturization and light weight of the optical imaging lens. More specifically, D0s, D0m, L, Fno, and f can satisfy: 20 mm < max(D0s, D0m) * L / (Fno * f) < 55 mm.

[0072] According to an exemplary embodiment of the present application, the optical imaging lens can satisfy 1 < f45 / d0m < 5, where f45 is the combined focal length of the fourth lens and the fifth lens, and d0m is the inner diameter of the image source side end of the lens barrel (see details in Figure 7A ). The optical imaging lens satisfies 1 < f45 / d0m < 5. By taking the fourth lens and the fifth lens as a group and reasonably configuring them with the opening on the human eye side of the lens barrel, the chromatic aberration of the image quality can be better adjusted, and at the same time, the optical precision of the lens can be effectively improved, the error can be reduced, and the performance can be improved and better image quality can be obtained.

[0073] According to an exemplary embodiment of the present application, the optical imaging lens can satisfy -10 < (D2s - d2s) / (D2m - d2m) * (f2 - f3) / (f2 + f3) < -5, where, as Figure 7B shown, D2s is the outer diameter of the human eye side of the second spacer element, d2s is the inner diameter of the human eye side of the second spacer element, D2m is the outer diameter of the image source side of the second spacer element, d2m is the inner diameter of the image source side of the second spacer element, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens. The optical imaging lens satisfies -10 < (D2s - d2s) / (D2m - d2m) * (f2 - f3) / (f2 + f3) < -5. By reasonably setting the outer diameter of the spacer element in contact with the image source side of the second lens and cooperating with the lens barrel, the reliability of the bearing can be ensured, and at the same time, by reasonably controlling the inner diameter of the spacer element, the light transmission amount can be effectively controlled, and the effect of reducing stray light can be achieved.

[0074] In an exemplary embodiment, in the optical imaging lens, one of the first and fifth lenses is directly supported to the lens barrel, while the other lens is fixed to the lens barrel via adhesive application or a pressure ring. The optical imaging lens of this application satisfies the above-mentioned configuration, effectively accommodating the lens assembly and spacer elements within the lens barrel. Furthermore, it ensures that lenses at one or both ends of the lens barrel can be supported and fixed to the inner wall of the lens barrel, guaranteeing the stability of the optical imaging lens during use, reducing the risk of displacement, improving the reliability of the optical imaging lens, and simultaneously ensuring the passage of normal light.

[0075] In embodiments of this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface; that is, at least one of the eye-side surface of the first lens to the image-source surface of the fifth lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has better curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. Optionally, at least one of the eye-side and image-source surfaces of each of the first, second, third, and fifth lenses is an aspherical mirror surface. Optionally, both the eye-side and image-source surfaces of each of the first, second, and third lenses are aspherical mirror surfaces.

[0076] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although five lenses are described as an example in the embodiments, the optical imaging lens is not limited to including five lenses. If desired, the optical imaging lens may also include other numbers of lenses.

[0077] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the optical imaging lens applicable to the above-described embodiments.

[0078] Example 1

[0079] The following is for reference Figures 1A to 2D Describes an optical imaging lens according to Embodiment 1 of this application. Figure 1A A schematic diagram of the lens group in an optical imaging lens according to Embodiment 1 of this application is shown; and Figures 1B to 1D Schematic diagrams of the lens barrel and various spacer elements in three different embodiments of the optical imaging lens of Example 1 are shown respectively.

[0080] like Figure 1AAs shown, the optical imaging lens includes, in order from the human eye side to the image source side: first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, and filter E6.

[0081] The first lens E1 has positive optical power, with its eye-side surface S1 being convex and its image-source surface S2 being convex. The second lens E2 has negative optical power, with its eye-side surface S3 being concave and its image-source surface S4 being convex. The third lens E3 has positive optical power, with its eye-side surface S5 being convex and its image-source surface S6 being convex. The fourth lens E4 has positive optical power, with its eye-side surface S7 being convex and its image-source surface S8 being convex. The fifth lens E5 has negative optical power, with its eye-side surface S9 being concave and its image-source surface S10 being concave. The filter E6 has image-source surfaces S11 and S12, and the optical imaging lens has an image-source surface S13.

[0082] The exemplary optical imaging lens of this application is as follows: Figure 1B As shown, the optical imaging lens includes a plurality of spacer elements, including a first spacer element, a second spacer element, a third spacer element, and a fourth spacer element. The first spacer element is disposed on the image source side of the first lens E1 and at least partially in contact with the first lens E1; the second spacer element is disposed on the image source side of the second lens E2 and at least partially in contact with the second lens E2; the third spacer element is disposed on the image source side of the third lens E3 and at least partially in contact with the third lens E3; and the fourth spacer element is disposed on the image source side of the fourth lens E4 and at least partially in contact with the fourth lens E4. In an exemplary embodiment of this application, the first spacer element may include a first spacer ring P1 and a first spacer shim P1b; the second spacer element may include a second spacer ring P2 and a second spacer shim P2b; the third spacer element may include a third spacer ring P3; and the fourth spacer element may include a fourth spacer ring P4. By appropriately setting the spacer shims, it is beneficial to block stray light and improve the imaging quality of the optical imaging lens. The first lens E1 is directly supported by the lens barrel, and the fifth lens E5 is fixed by applying adhesive at point M, ensuring that the optical imaging lens is stable and will not fall off during use, reducing the risk of displacement, improving the reliability of the optical imaging lens, and ensuring the passage of normal light.

[0083] The exemplary optical imaging lens of this application is as follows: Figure 1CAs shown, the optical imaging lens includes a second spacer element, a third spacer element, and a fourth spacer element. The second spacer element is disposed on the image source side of the second lens E2 and at least partially contacts the second lens E2; the third spacer element is disposed on the image source side of the third lens E3 and at least partially contacts the third lens E3; and the fourth spacer element is disposed on the image source side of the fourth lens E4 and at least partially contacts the fourth lens E4. In an exemplary embodiment of this application, the second spacer element may include a second spacer ring P2 and a second spacer pad P2b; the third spacer element may include a third spacer ring P3, a third spacer pad P3b, and a third additional spacer ring P3c; and the fourth spacer element may include a fourth spacer ring P4. Appropriately setting the spacer pads helps to block stray light and improve the imaging quality of the optical imaging lens. The first lens E1 is directly supported by the lens barrel, and the fifth lens E5 is fixed by adhesive at point M, ensuring the optical imaging lens remains stable and does not fall off during use, reducing the risk of displacement, improving the reliability of the optical imaging lens, and ensuring the passage of normal light.

[0084] The exemplary optical imaging lens of this application is as follows: Figure 1D As shown, the optical imaging lens includes a second spacer element and a third spacer element. The second spacer element is disposed on the image source side of the second lens E2 and at least partially contacts the second lens E2, while the third spacer element is disposed on the image source side of the third lens E3 and at least partially contacts the third lens E3. In an exemplary embodiment of this application, the second spacer element may include a second spacer ring P2 and a second spacer pad P2b, and the third spacer element may include a third spacer ring P3, a third spacer pad P3b, and a third additional spacer ring P3c. Appropriately setting the spacer pad helps to block stray light and improve the imaging quality of the optical imaging lens. The first lens E1 is directly supported by the lens barrel, and the fifth lens E5 is fixed by adhesive at point M, ensuring the optical imaging lens remains stable and does not fall off during use, reducing the risk of displacement, improving the reliability of the optical imaging lens, and ensuring the passage of normal light.

[0085] Table 1 shows the basic parameters of the optical imaging system of Example 1, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm).

[0086]

[0087] Table 1

[0088] In Example 1, the total effective focal length f of the optical imaging lens is 13.35mm, half the diagonal length of the effective pixel area on the image source surface ImgH is 2.98mm, and the aperture value Fno of the optical imaging lens is 1.67.

[0089] In Example 1, the human eye side and image source side of any one of the first lens E1, the second lens E2, and the third lens E3 are both aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0090]

[0091] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A9, and A1 that can be used for the aspherical mirrors S1 to S6 in Example 1. 10 A 12 A 14 A 16 A 18 and A 20 .

[0092] 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

[0093] Table 2

[0094] Table 3 shows the basic parameters of the lens barrel and each spacer element under three implementations of the optical imaging lens of Example 1. In Table 3, the unit of each parameter is millimeters (mm).

[0095]

[0096] Table 3

[0097] Figure 2A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 2B The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2C The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 2D The relative illumination curve of the optical imaging lens of Example 1 is shown, representing the magnitude 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.

[0098] Example 2

[0099] The following is for reference Figures 3A to 4D Describes an optical imaging lens according to Embodiment 2 of this application. Figure 3AA schematic diagram of the lens group in an optical imaging lens according to Embodiment 2 of this application is shown; and Figures 4B to 4D Schematic diagrams of the lens barrel and various spacer elements in three different embodiments of the optical imaging lens of Example 2 are shown respectively.

[0100] like Figure 3A As shown, the optical imaging lens includes, in order from the human eye side to the image source side: first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, and filter E6.

[0101] The first lens E1 has positive optical power, with its eye-side surface S1 being convex and its image-source surface S2 being convex. The second lens E2 has negative optical power, with its eye-side surface S3 being concave and its image-source surface S4 being concave. The third lens E3 has positive optical power, with its eye-side surface S5 being convex and its image-source surface S6 being convex. The fourth lens E4 has positive optical power, with its eye-side surface S7 being convex and its image-source surface S8 being concave. The fifth lens E5 has negative optical power, with its eye-side surface S9 being concave and its image-source surface S10 being concave. The filter E6 has an eye-side surface S11 and an image-source surface S12, and the optical imaging lens has an image-source surface S13.

[0102] The exemplary optical imaging lens of this application is as follows: Figure 3B As shown, the optical imaging lens includes a first spacer element, a second spacer element, and a fourth spacer element. The first spacer element is disposed on the image source side of the first lens E1 and at least partially contacts the first lens E1; the second spacer element is disposed on the image source side of the second lens E2 and at least partially contacts the second lens E2; and the fourth spacer element is disposed on the image source side of the fourth lens E4 and at least partially contacts the fourth lens E4. In an exemplary embodiment of this application, the first spacer element may include a first spacer ring P1 and a first spacer pad P1b; the second spacer element may include a second spacer ring P2; and the fourth spacer element may include a fourth spacer ring P4. Appropriately setting the spacer pad helps to block stray light and improve the imaging quality of the optical imaging lens. The first lens E1 is directly supported by the lens barrel, and the fifth lens E5 is fixed by adhesive at point M, ensuring the optical imaging lens remains stable and does not fall off during use, reducing the risk of displacement, improving the reliability of the optical imaging lens, and ensuring the passage of normal light.

[0103] The exemplary optical imaging lens of this application is as follows: Figure 3CAs shown, the optical imaging lens includes multiple spacer elements, including a first spacer element, a second spacer element, and a third spacer element. The first spacer element is disposed on the image source side of the first lens E1 and at least partially contacts the first lens E1; the second spacer element is disposed on the image source side of the second lens E2 and at least partially contacts the second lens E2; and the third spacer element is disposed on the image source side of the third lens E3 and at least partially contacts the third lens E3. In an exemplary embodiment of this application, the first spacer element may include a first spacer ring P1 and a first spacer shim P1b; the second spacer element may include a second spacer ring P2; and the third spacer element may include a third spacer ring P3. Appropriately setting the spacer shims helps to block stray light and improve the imaging quality of the optical imaging lens. The first lens E1 and the fifth lens E5 directly abut against the lens barrel, ensuring the optical imaging lens remains stable and does not fall off during use, reducing the risk of displacement, improving the reliability of the optical imaging lens, and ensuring the passage of normal light.

[0104] The exemplary optical imaging lens of this application is as follows: Figure 3D As shown, the optical imaging lens includes multiple spacer elements, including a first spacer element, a second spacer element, and a third spacer element. The first spacer element is disposed on the image source side of the first lens E1 and at least partially contacts the first lens E1; the second spacer element is disposed on the image source side of the second lens E2 and at least partially contacts the second lens E2; and the third spacer element is disposed on the image source side of the third lens E3 and at least partially contacts the third lens E3. In an exemplary embodiment of this application, the first spacer element may include a first spacer ring P1 and a first spacer pad P1b; the second spacer element may include a second spacer ring P2; and the third spacer element may include a third spacer ring P3. Appropriately setting the spacer pad helps to block stray light and improve the imaging quality of the optical imaging lens. The first lens E1 is fixed at point M by adhesive application, and the fifth lens E5 directly rests against the lens barrel, ensuring the optical imaging lens is stable and does not fall off during use, reducing the risk of displacement, improving the reliability of the optical imaging lens, and ensuring the passage of normal light.

[0105] In Example 2, the total effective focal length f of the optical imaging lens is 13.41 mm, half the diagonal length of the effective pixel area on the image source surface ImgH is 6.45 mm, the maximum field of view FOV of the optical imaging lens is 53.9°, and the aperture value Fno of the optical imaging lens is 1.68.

[0106] Table 4 shows the basic parameters of the optical imaging lens of Embodiment 2, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm). Table 5 shows the higher-order coefficients applicable to each aspherical mirror in Embodiment 2, where each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above. Table 6 shows the basic parameters of the lens barrel and each spacer element under three implementations of the optical imaging lens of Embodiment 2, where the units for each parameter in Table 6 are millimeters (mm).

[0107]

[0108] Table 4

[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 5

[0111]

[0112]

[0113] Table 6

[0114] Figure 4A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 4B The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4C The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 4D The relative illumination curve of the optical imaging lens of Example 2 is shown, representing the magnitude 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 Example 2 can achieve good imaging quality.

[0115] Example 3

[0116] The following is for reference Figures 5A to 6D Describes an optical imaging lens according to Embodiment 3 of this application. Figure 5A A schematic diagram of the lens group in an optical imaging lens according to Embodiment 3 of this application is shown; and Figures 6B to 6D Schematic diagrams of the lens barrel and various spacer elements in three different embodiments of the optical imaging lens of Example 3 are shown respectively.

[0117] like Figure 5A As shown, the optical imaging lens includes, in order from the human eye side to the image source side: first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, and filter E6.

[0118] The first lens E1 has positive optical power, with its eye-side surface S1 being convex and its image-source surface S2 being convex. The second lens E2 has negative optical power, with its eye-side surface S3 being concave and its image-source surface S4 being concave. The third lens E3 has positive optical power, with its eye-side surface S5 being convex and its image-source surface S6 being convex. The fourth lens E4 has positive optical power, with its eye-side surface S7 being convex and its image-source surface S8 being convex. The fifth lens E5 has negative optical power, with its eye-side surface S9 being concave and its image-source surface S10 being concave. The filter E6 has an eye-side surface S11 and an image-source surface S12, and the optical imaging lens has an image-source surface S13.

[0119] The exemplary optical imaging lens of this application is as follows: Figure 5B As shown, the optical imaging lens includes a first spacer element and a second spacer element. The first spacer element is disposed on the image source side of the first lens E1 and at least partially contacts the first lens E1, while the second spacer element is disposed on the image source side of the second lens E2 and at least partially contacts the second lens E2. In an exemplary embodiment of this application, the first spacer element may include a first spacer ring P1, and the second spacer element may include a second spacer ring P2 and a second spacer pad P2b. Appropriately setting the spacer pad helps to block stray light and improve the imaging quality of the optical imaging lens. The first lens E1 is directly supported by the lens barrel, and the fifth lens E5 is fixed at point M by adhesive application, ensuring the optical imaging lens remains stable and does not fall off during use, reducing the risk of displacement, improving the reliability of the optical imaging lens, and ensuring the passage of normal light.

[0120] The exemplary optical imaging lens of this application is as follows: Figure 5CAs shown, the optical imaging lens includes a plurality of spacer elements, including a first spacer element, a second spacer element, a third spacer element, and a sixth spacer element. The first spacer element is disposed on the image source side of the first lens E1 and at least partially in contact with the first lens E1; the second spacer element is disposed on the image source side of the second lens E2 and at least partially in contact with the second lens E2; the third spacer element is disposed on the image source side of the third lens E3 and at least partially in contact with the third lens E3; and the sixth spacer element is disposed on the eye side of the first lens E1 and at least partially in contact with the first lens E1. In an exemplary embodiment of this application, the first spacer element may include a first spacer ring P1, the second spacer element may include a second spacer ring P2 and a second spacer shim P2b, the third spacer element may include a third spacer ring P3, and the sixth spacer element may include a sixth spacer ring P6. By appropriately setting the spacer shims, it is beneficial to block stray light and improve the imaging quality of the optical imaging lens. The first lens E1 is connected to the sixth spacer P6, and the fifth lens E5 is directly supported by the lens barrel, ensuring that the optical imaging lens is stable and does not fall off during use, reducing the risk of displacement, improving the reliability of the optical imaging lens, and ensuring the passage of normal light.

[0121] The exemplary optical imaging lens of this application is as follows: Figure 5D As shown, the optical imaging lens comprises multiple spacer elements, including a first spacer element, a second spacer element, and a third spacer element. The first spacer element is disposed on the image source side of the first lens E1 and at least partially contacts the first lens E1; the second spacer element is disposed on the image source side of the second lens E2 and at least partially contacts the second lens E2; and the third spacer element is disposed on the image source side of the third lens E3 and at least partially contacts the third lens E3. In an exemplary embodiment of this application, the first spacer element may include a first spacer ring P1, the second spacer element may include a second spacer ring P2 and a second spacer pad P2b, and the third spacer element may include a third spacer ring P3. Appropriately setting the spacer pad helps to block stray light and improve the imaging quality of the optical imaging lens. The first lens E1 is fixed at point M by adhesive application, and the fifth lens E5 directly rests against the lens barrel, ensuring the optical imaging lens remains stable and does not fall off during use, reducing the risk of displacement, improving the reliability of the optical imaging lens, and ensuring the passage of normal light.

[0122] In Example 3, the total effective focal length f of the optical imaging lens is 13.19 mm, half the diagonal length of the effective pixel area on the image source surface ImgH is 6.45 mm, and the aperture value Fno of the optical imaging lens is 1.65.

[0123] Table 7 shows the basic parameters of the optical imaging lens of Embodiment 3, wherein the units of radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 8 shows the higher-order coefficients applicable to each aspherical mirror in Embodiment 3, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above. Table 9 shows the basic parameters of the lens barrel and each spacer element under three implementations of the optical imaging lens of Embodiment 9, wherein the units of each parameter in Table 9 are all millimeters (mm).

[0124]

[0125] Table 7

[0126] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.3447E-05 2.8081E-06 -1.1271E-07 1.8297E-09 -1.9339E-11 1.1432E-13 -2.6373E-16 0.0000E+00 0.0000E+00 S2 -2.3840E-05 9.3170E-06 -1.5115E-07 2.7118E-10 8.6910E-12 -6.9062E-14 1.7923E-16 0.0000E+00 0.0000E+00 S3 -3.6416E-04 2.6789E-05 -6.7210E-07 1.0956E-08 -1.3710E-10 1.2658E-12 -7.8610E-15 2.9108E-17 -4.8220E-20 S4 -8.1232E-04 4.8490E-05 -1.3730E-06 2.3236E-08 -2.5893E-10 1.9615E-12 -9.8958E-15 3.0045E-17 -4.1110E-20 S5 -1.4235E-03 5.9674E-05 -1.2472E-06 1.3000E-08 -3.2468E-11 -6.9660E-13 7.9989E-15 -3.5328E-17 5.9361E-20 S6 1.4586E-05 3.2660E-06 -7.3724E-08 3.5504E-09 -9.4448E-11 1.3273E-12 -9.7835E-15 3.5520E-17 -4.9390E-20

[0127] Table 8

[0128]

[0129]

[0130] Table 9

[0131] Figure 6A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 6B The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6C The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 6D The relative illumination curve of the optical imaging lens of Example 3 is shown, representing the magnitude of the relative illumination corresponding to different image heights. According to... Figures 6A to 6D It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0132] In summary, Examples 1 to 3 satisfy the relationships shown in Table 10.

[0133]

[0134] Table 10

[0135] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that, The optical imaging lens is composed of a lens barrel, a lens group and a plurality of spacer elements accommodated in the lens barrel, wherein, the lens barrel has an eye side end facing a human eye and an image source side end facing an image source; the lens group comprises, in sequence along the optical axis from the eye side to the image source side: a first lens with positive refractive power, the eye side surface of which is convex, and the image source side surface of which is convex; a second lens with negative refractive power, the eye side surface of which is concave; a third lens with positive refractive power, the eye side surface of which is convex, and the image source side surface of which is convex; a fourth lens with positive refractive power, the eye side surface of which is convex; and a fifth lens with negative refractive power, the eye side surface of which is concave, and the image source side surface of which is concave; the number of lenses with refractive power in the optical imaging lens is five; at least one surface of at least one lens among the first lens to the fifth lens is aspherical, wherein the first lens, the second lens and the third lens constitute a first lens group, the fourth lens and the fifth lens constitute a second lens group with positive refractive power, and the on-axis distance between any two adjacent lenses in the first lens group is greater than the on-axis distance between two lenses in the second lens group; and the plurality of spacer elements comprises a second spacer element arranged on the image source side surface of the second lens, the image source side surface of the second lens and the eye side surface of the second spacer element being in contact with each other; the on-axis distance TD from the eye side surface of the first lens to the image source side surface of the fifth lens, the maximum height L of the lens barrel extending in the direction of the optical axis, the outer diameter D0s of the eye side end of the lens barrel and the outer diameter D0m of the image source side end of the lens barrel, the refractive index n4 of the fourth lens, the refractive index n5 of the fifth lens, the central thickness CT4 of the fourth lens, the central thickness CT5 of the fifth lens, the outer diameter D2s of the eye side surface of the second spacer element, the inner diameter d2s of the eye side surface of the second spacer element, the outer diameter D2m of the image source side surface of the second spacer element, the inner diameter d2m of the image source side surface of the second spacer element, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the combined focal length f45 of the fourth lens and the fifth lens, and the inner diameter d0m of the image source side end of the lens barrel satisfy: 0<|TD / L-D0s / D0m|≤0.57; 1.36≤(n4-1.8) / (n4-n5)+(L-CT4) / (L-CT5)≤4.32; -7.44 < (D2s - d2s) / (D2m - d2m) (f2 - f3) / (f2 + f3) < -5.32; 1.35≤f45 / d0m≤4.

21. 2.The optical imaging lens according to claim 1, characterized in that, the curvature radius R3 of the eye side surface of the second lens, the central thickness CT2 of the second lens, the on-axis distance T23 from the second lens to the third lens, the inner diameter d2s of the eye side surface of the second spacer element, the inner diameter d2m of the image source side surface of the second spacer element, and the curvature radius R4 of the image source side surface of the second lens satisfy: - 2.70 mm -1 ≤ (R3 / CT2 + R4 / T23) / (d2s + d2m) ≤ 4.15 mm -1 . 3.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements includes at least one spacer element disposed between the second lens and the third lens, a sum ∑CP2 of a radius of curvature R4 of an image source side surface of the second lens, a radius of curvature R5 of a human eye side surface of the third lens, an on-axis distance T23 from the second lens to the third lens, and a maximum thickness of each of the at least one spacer element satisfies: 0.67≤|R4 / R5|+(∑CP2 / T23)≤21.

28. 4.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements includes at least two spacer elements disposed between adjacent two lenses of the first lens to the fourth lens, and the at least two spacer elements are fixedly adhered to each other by glue.

5. The optical imaging lens according to claim 1, characterized in that, A center thickness CT1 of the first lens, an on-axis distance T12 from the first lens to the second lens, a center thickness CT2 of the second lens, an on-axis distance T23 from the second lens to the third lens, a center thickness CT3 of the third lens, a radius of curvature R6 of an image source side surface of the third lens, a radius of curvature R1 of a human eye side surface of the first lens, and a maximum height L of the lens barrel extending in the direction of the optical axis satisfy: -1.12 < (CT1+T12+CT2+T23+CT3) (R1 / R6) / L < -0.

5. 6.The optical imaging lens according to claim 1, wherein, A radius of curvature R1 of a human eye side surface of the first lens, a radius of curvature R10 of an image source side surface of the fifth lens, an outer diameter D0s of a human eye side end of the lens barrel, an inner diameter d0s of the human eye side end of the lens barrel, an outer diameter D0m of an image source side end of the lens barrel, and an inner diameter d0m of the image source side end of the lens barrel satisfy: 0.11 < R1 / R10 |D0s-d0s| / |D0m-d0m| < 8. 7.The optical imaging lens according to claim 1, wherein, A sum ∑CP of the maximum thickness of each of the plurality of spacer elements, a sum ∑AT of the spacing of any adjacent two lenses of the first lens to the fifth lens on the optical axis, a sum ∑CT of the center thickness of the first lens to the fifth lens, and a maximum height L of the lens barrel extending in the direction of the optical axis satisfy: 1.23≤∑CP / ∑AT+∑CT / L≤4.

82. 8.The optical imaging lens according to claim 1, wherein, An on-axis distance T34 from the third lens to the fourth lens, a radius of curvature R6 of an image source side surface of the third lens, a radius of curvature R7 of a human eye side surface of the fourth lens, and a maximum height L of the lens barrel extending in the direction of the optical axis satisfy: -1.21≤T34 / L-|R6 / R7|≤-0.

62. 9.The optical imaging lens according to claim 1, wherein, At least one lens of the first lens to the fifth lens is a glass lens, and at least one of a human eye side surface and an image source side surface of the glass lens is a glass aspheric surface.

10. The optical imaging lens according to claim 9, characterized in that, A refractive index n1 of the first lens, a refractive index n2 of the second lens, a refractive index n3 of the third lens, a center thickness CT1 of the first lens, a center thickness CT2 of the second lens, a center thickness CT3 of the third lens, and a maximum height L of the lens barrel extending in the direction of the optical axis satisfy: 1.30 < 2 n3 / (n1+n2)+(CT1+CT2+CT3) / L < 1.

63.

11. The optical imaging lens according to claim 9, characterized in that, An outer diameter D0s of a human eye side end of the lens barrel, an outer diameter D0m of an image source side end of the lens barrel, an aperture value Fno of the optical imaging lens, a total effective focal length f of the optical imaging lens, and a maximum height L of the lens barrel extending in the direction of the optical axis satisfy: 26.75mm ≤ max(D0s, D0m) L / (Fno f) ≤ 50.23mm, wherein max(D0s, D0m) means the maximum value between D0s and D0m.

12. The optical imaging lens according to any one of claims 1-9, wherein, One of the first lens and the fifth lens is directly abutted with the lens barrel, and the other is glued or fixed by a pressing ring.

13. An optical imaging lens characterized in that, The optical imaging lens is composed of a lens barrel, a lens group and a plurality of spacer elements accommodated in the lens barrel, wherein, The lens barrel has an eye side end facing the human eye and an image source side end facing the image source; The lens group comprises, in sequence from the eye side to the image source side along the optical axis, a first lens with positive refractive power, the eye side surface of which is convex, and the image source side surface of which is convex; a second lens with negative refractive power, the eye side surface of which is concave; a third lens with positive refractive power, the eye side surface of which is convex, and the image source side surface of which is convex; a fourth lens with positive refractive power, the eye side surface of which is convex; and a fifth lens with negative refractive power, the eye side surface of which is concave, and the image source side surface of which is concave; The number of lenses with refractive power in the optical imaging lens is five; At least one surface of at least one of the first lens to the fifth lens is aspherical, wherein at least one of the eye side surface and the image source side surface of the glass lens is a glass aspherical surface; and The plurality of spacer elements comprises a second spacer element arranged on the image source side surface of the second lens, and the image source side surface of the second lens and the eye side surface of the second spacer element are in contact with each other; The refractive index n1 of the first lens, the refractive index n2 of the second lens, the refractive index n3 of the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, the central thickness CT3 of the third lens, the maximum height L of the lens barrel extending in the direction of the optical axis, the refractive index n4 of the fourth lens, the refractive index n5 of the fifth lens, the central thickness CT4 of the fourth lens, the central thickness CT5 of the fifth lens, the outer diameter D2s of the eye side surface of the second spacer element, the inner diameter d2s of the eye side surface of the second spacer element, the outer diameter D2m of the image source side surface of the second spacer element, the inner diameter d2m of the image source side surface of the second spacer element, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the combined focal length f45 of the fourth lens and the fifth lens, and the inner diameter d0m of the image source side end of the lens barrel satisfy: 1.30 < 2 n3 / (n1+n2)+(CT1+CT2+CT3) / L < 1.63; 1.36≤(n4-1.8) / (n4-n5)+(L-CT4) / (L-CT5)≤4.32; -7.44 < (D2s - d2s) / (D2m - d2m) (f2 - f3) / (f2 + f3) < -5.32; 1.35≤f45 / d0m≤4.

21.

14. The optical imaging lens according to claim 13, characterized in that, The curvature radius R3 of the eye side surface of the second lens, the central thickness CT2 of the second lens, the on-axis distance T23 from the second lens to the third lens, the inner diameter d2s of the eye side surface of the second spacer element, the inner diameter d2m of the image source side surface of the second spacer element, and the curvature radius R4 of the image source side surface of the second lens satisfy: - 2.70 mm -1 ≤ (R3 / CT2 + R4 / T23) / (d2s + d2m) ≤ 4.15 mm -1 .

15. The optical imaging lens according to claim 13, characterized in that, The plurality of spacer elements includes at least one spacer element disposed between the second lens and the third lens, and a sum ∑CP2 of a radius of curvature R4 of an image source side surface of the second lens, a radius of curvature R5 of an eye side surface of the third lens, an on-axis distance T23 from the second lens to the third lens, and a maximum thickness of each of the at least one spacer element satisfies: 0.67≤|R4 / R5|+(∑CP2 / T23)≤21.

28.

16. The optical imaging lens according to claim 13, characterized in that, The plurality of spacer elements includes at least two spacer elements disposed between adjacent two lenses among the first lens to the fourth lens, and the at least two spacer elements are fixedly adhered to each other by glue.

17. The optical imaging lens according to claim 13, characterized in that, A center thickness CT1 of the first lens, an on-axis distance T12 from the first lens to the second lens, a center thickness CT2 of the second lens, an on-axis distance T23 from the second lens to the third lens, a center thickness CT3 of the third lens, a radius of curvature R6 of an image source side surface of the third lens, a radius of curvature R1 of an eye side surface of the first lens, and a maximum height L of the lens barrel extending in the direction of the optical axis satisfy: -1.12 < (CT1+T12+CT2+T23+CT3) (R1 / R6) / L < -0.

5.

18. The optical imaging lens according to claim 13, characterized in that, A radius of curvature R1 of an eye side surface of the first lens, a radius of curvature R10 of an image source side surface of the fifth lens, an outer diameter D0s of an eye side end of the lens barrel, an inner diameter d0s of the eye side end of the lens barrel, an outer diameter D0m of an image source side end of the lens barrel, and an inner diameter d0m of the image source side end of the lens barrel satisfy: 0.11 < R1 / R10 |D0s-d0s| / |D0m-d0m| < 8.

19. The optical imaging lens according to claim 13, characterized in that, A sum ∑CP of the maximum thickness of each of the plurality of spacer elements, a sum ∑AT of the spacing of any adjacent two lenses among the first lens to the fifth lens on the optical axis, a sum ∑CT of the center thickness of the first lens to the fifth lens, and a maximum height L of the lens barrel extending in the direction of the optical axis satisfy: 1.23≤∑CP / ∑AT+∑CT / L≤4.

82.

20. The optical imaging lens according to claim 13, characterized in that, An on-axis distance T34 from the third lens to the fourth lens, a radius of curvature R6 of an image source side surface of the third lens, a radius of curvature R7 of an eye side surface of the fourth lens, and a maximum height L of the lens barrel extending in the direction of the optical axis satisfy: -1.21≤T34 / L-|R6 / R7|≤-0.

62.

21. The optical imaging lens according to claim 13, characterized in that, An outer diameter D0s of an eye side end of the lens barrel, an outer diameter D0m of an image source side end of the lens barrel, an aperture value Fno of the optical imaging lens, a total effective focal length f of the optical imaging lens, and a maximum height L of the lens barrel extending in the direction of the optical axis satisfy: 26.75mm ≤ max(D0s, D0m) L / (Fno f) ≤ 50.23mm, wherein max(D0s, D0m) means the maximum value between D0s and D0m.

22. The optical imaging lens according to any one of claims 13-21, wherein, One of the first lens and the fifth lens is directly abutted with the lens barrel, and the other is fixed by point gluing or ring pressing.

Images