Optical imaging lens group

Abstract

The present application discloses an optical imaging lens group, which sequentially includes, from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens with optical power; a third lens with optical power; a fourth lens with optical power, whose image side is concave; a fifth lens with positive optical power, whose image side is convex; wherein, the axial distance SAG41 between the intersection point of the object side of the fourth lens and the optical axis and the vertex of the effective radius of the object side of the fourth lens and the axial distance SAG42 between the intersection point of the image side of the fourth lens and the optical axis and the vertex of the effective radius of the image side of the fourth lens satisfy: SAG41 / SAG42 < 0; the interval distance T23 between the second lens and the third lens on the optical axis and the central thickness CT3 of the third lens satisfy: 1 < T23 / CT3 < 3.2.

Description

Technical Field

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

[0002] With the continuous development of science and technology, especially the continuous innovation of intelligent devices, the optical imaging lens group capable of acquiring environmental information plays an increasingly important role. In all aspects of people's work and life, there are modules equipped with optical imaging lens groups, such as the optical modules in devices such as mobile phones, computers, and smart watches related to the entertainment field or the life field, and the vehicle-mounted optical modules and security optical modules in the production and security fields.

[0003] There are various types of optical imaging lens groups. Among them, the long-focus optical imaging lens group has the advantage of long-distance photography. Although a general short-focus optical imaging lens group can clearly image when shooting scenes at a short distance, when using it to shoot at a long distance, it cannot clearly image the scene on the detector. If you want to observe a long-distance scene, you need to magnify the captured image. However, the magnified image shows more noise and has a smeared feeling. Compared with the short-focus optical imaging lens group,

[0004] In order to achieve clearer imaging when shooting at a long distance, an optical imaging lens group with a long focal length and high imaging quality is desired. Summary of the Invention

[0005] The present application provides an optical imaging lens group, which sequentially includes, along the optical axis from the object side to the image side: a first lens with positive optical power; a second lens with optical power; a third lens with optical power; a fourth lens with optical power, whose image side is concave; a fifth lens with positive optical power, whose image side is convex; wherein, the axial distance SAG41 between the intersection point of the object side of the fourth lens and the optical axis and the effective radius vertex of the object side of the fourth lens and the axial distance SAG42 between the intersection point of the image side of the fourth lens and the optical axis and the effective radius vertex of the image side of the fourth lens can satisfy: SAG41 / SAG42 < 0; the interval distance T23 between the second lens and the third lens on the optical axis and the central thickness CT3 of the third lens can satisfy: 1 < T23 / CT3 < 3.2.

[0006] In one embodiment, at least one of the object side of the first lens to the image side of the fifth lens is an aspherical mirror surface.

[0007] In one embodiment, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens can satisfy: 0.8 < f2 / f4 < 2.

[0008] In one embodiment, the distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging lens group on the optical axis and the total effective focal length f of the optical imaging lens group satisfy: TTL / f < 1.

[0009] In one embodiment, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f1 of the first lens satisfy: 0.3 < R1 / f1 < 0.7.

[0010] In one embodiment, the combined focal length f45 of the fourth lens and the fifth lens and the total effective focal length f of the optical imaging lens group satisfy: -5 < f45 / f < 0.

[0011] In one embodiment, the radius of curvature R10 of the image side surface of the fifth lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -3 < R10 / R4 < -1.

[0012] In one embodiment, the central thickness CT3 of the third lens and the distance T34 between the third lens and the fourth lens on the optical axis satisfy: 0.2 < CT3 / T34 < 0.7.

[0013] In one embodiment, the distance T45 between the fourth lens and the fifth lens on the optical axis, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens satisfy: T45 / (CT4 + CT5) < 0.5.

[0014] In one embodiment, the axial distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens and the central thickness CT2 of the second lens satisfy: |SAG21×10 / CT2| < 1.2.

[0015] In one embodiment, the distance T34 between the third lens and the fourth lens on the optical axis and the distance Tr7r10 between the object side surface of the fourth lens and the image side surface of the fifth lens on the optical axis satisfy: 0.5 < T34 / Tr7r10 < 1.2.

[0016] In one embodiment, the effective semi-aperture values of the respective mirror surfaces from the object side surface of the third lens to the image side surface of the fifth lens increase in sequence; the effective semi-aperture DT11 of the object side surface of the first lens and the effective semi-aperture DT42 of the image side surface of the fourth lens satisfy: 0.5 < DT11 / DT42 < 1.

[0017] In one embodiment, the axial distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens and the central thickness CT5 of the fifth lens satisfy: 0 < SAG51 / CT5 < 0.5.

[0018] In one embodiment, no filter element is provided between the image side surface of the fifth lens and the imaging surface of the optical imaging lens group.

[0019] In one embodiment, at least one mirror surface from the object side surface of the first lens to the image side surface of the fifth lens is coated with an infrared cut-off film.

[0020] On the other hand, the present application provides an optical imaging lens group, which sequentially includes, from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens with optical power; a third lens with optical power; a fourth lens with a concave image side surface; a fifth lens with positive optical power and a convex image side surface; wherein, the axial distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens and the axial distance SAG42 between the intersection point of the image side surface of the fourth lens and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens can satisfy: SAG41 / SAG42 < 0; the axial distance SAG21 between the intersection point of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens and the central thickness CT2 of the second lens can satisfy: |SAG21×10 / CT2| < 1.2.

[0021] In one embodiment, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens can satisfy: 0.8 < f2 / f4 < 2.

[0022] In one embodiment, the interval distance TTL on the optical axis between the object side surface of the first lens and the imaging surface of the optical imaging lens group and the total effective focal length f of the optical imaging lens group can satisfy: TTL / f < 1.

[0023] In one embodiment, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f1 of the first lens can satisfy: 0.3 < R1 / f1 < 0.7.

[0024] In one embodiment, the combined focal length f45 of the fourth lens and the fifth lens and the total effective focal length f of the optical imaging lens group can satisfy: -5 < f45 / f < 0.

[0025] In one embodiment, the radius of curvature R10 of the image side surface of the fifth lens and the radius of curvature R4 of the image side surface of the second lens can satisfy: -3 < R10 / R4 < -1.

[0026] In one embodiment, the central thickness CT3 of the third lens and the interval distance T34 on the optical axis between the third lens and the fourth lens can satisfy: 0.2 < CT3 / T34 < 0.7.

[0027] In one embodiment, the axial distance T45 between the fourth lens and the fifth lens, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens may satisfy: T45 / (CT4 + CT5) < 0.5.

[0028] In one embodiment, the axial distance T23 between the second lens and the third lens and the central thickness CT3 of the third lens may satisfy: 1 < T23 / CT3 < 3.2.

[0029] In one embodiment, the axial distance T34 between the third lens and the fourth lens and the axial distance Tr7r10 between the object side surface of the fourth lens and the image side surface of the fifth lens may satisfy: 0.5 < T34 / Tr7r10 < 1.2.

[0030] In one embodiment, the effective semi-aperture values of the respective mirror surfaces from the object side surface of the third lens to the image side surface of the fifth lens increase in sequence; the effective semi-aperture DT11 of the object side surface of the first lens and the effective semi-aperture DT42 of the image side surface of the fourth lens may satisfy: 0.5 < DT11 / DT42 < 1.

[0031] In one embodiment, the axial distance SAG51 between the intersection point of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens and the central thickness CT5 of the fifth lens may satisfy: 0 < SAG51 / CT5 < 0.5.

[0032] In one embodiment, no filter element is provided between the image side surface of the fifth lens and the imaging surface of the optical imaging lens group.

[0033] In one embodiment, an infrared cut-off film is deposited on at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the fifth lens.

[0034] This application uses five lenses. By reasonably allocating the optical power, surface shape, central thickness of each lens, and the axial spacing between each lens, etc., the above optical imaging lens group has at least one beneficial effect such as long focal length, high imaging quality, light weight, and low cost. The long-focus optical imaging lens group can achieve clear imaging at a long distance and still maintain a clear picture at a certain magnification. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In conjunction with the drawings, through the following detailed description of non-limiting embodiments, other features, objects, and advantages of this application will become more apparent. In the drawings:

[0036] Figure 1 A schematic structural diagram of the optical imaging lens group according to Embodiment 1 of this application is shown; Figures 2A to 2DThe astigmatism curve, distortion curve, longitudinal chromatic aberration curve, and relative illumination curve of the optical imaging lens group of Embodiment 1 are respectively shown;

[0037] Figure 3 The structural schematic diagram of the optical imaging lens group according to Embodiment 2 of the present application is shown; Figures 4A to 4D The astigmatism curve, distortion curve, longitudinal chromatic aberration curve, and relative illumination curve of the optical imaging lens group of Embodiment 2 are respectively shown;

[0038] Figure 5 The structural schematic diagram of the optical imaging lens group according to Embodiment 3 of the present application is shown; Figures 6A to 6D The astigmatism curve, distortion curve, longitudinal chromatic aberration curve, and relative illumination curve of the optical imaging lens group of Embodiment 3 are respectively shown;

[0039] Figure 7 The structural schematic diagram of the optical imaging lens group according to Embodiment 4 of the present application is shown; Figures 8A to 8D The astigmatism curve, distortion curve, longitudinal chromatic aberration curve, and relative illumination curve of the optical imaging lens group of Embodiment 4 are respectively shown;

[0040] Figure 9 The structural schematic diagram of the optical imaging lens group according to Embodiment 5 of the present application is shown; Figures 10A to 10D The astigmatism curve, distortion curve, longitudinal chromatic aberration curve, and relative illumination curve of the optical imaging lens group of Embodiment 5 are respectively shown;

[0041] Figure 11 The structural schematic diagram of the optical imaging lens group according to Embodiment 6 of the present application is shown; Figures 12A to 12D The astigmatism curve, distortion curve, longitudinal chromatic aberration curve, and relative illumination curve of the optical imaging lens group of Embodiment 6 are respectively shown. Detailed implementation manners

[0042] 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 the 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.

[0043] 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.

[0044] In the drawings, for ease of explanation, the thickness, dimensions, 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.

[0045] 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 to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0046] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when 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 an individual element in the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0047] Unless otherwise defined, all terms (including technical and scientific terms) used herein 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 commonly used 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 formal sense unless expressly so defined herein.

[0048] 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 drawings and in combination with embodiments.

[0049] The features, principles and other aspects of the present application will be described in detail below.

[0050] The optical imaging lens group 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 order from the object side to the image side along the optical axis. An air gap may be provided between any two adjacent lenses among the first lens to the fifth lens.

[0051] In an exemplary embodiment, the first lens may have a positive optical power; the second lens has a positive or negative optical power; the third lens has a positive or negative optical power; the fourth lens has a positive or negative optical power, and its image side is concave; the fifth lens may have a positive optical power, and its image side may be convex. By reasonably controlling the positive and negative distribution of the optical powers of the respective components of the lens and the curvature of the lens surface types, the low-order aberrations of the lens are effectively balanced and controlled.

[0052] In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional formula: SAG41 / SAG42 < 0, where SAG41 is the axial distance between the intersection of the object side of the fourth lens and the optical axis and the vertex of the effective radius of the object side of the fourth lens, and SAG42 is the axial distance between the intersection of the image side of the fourth lens and the optical axis and the vertex of the effective radius of the image side of the fourth lens. The optical imaging lens group satisfying SAG41 / SAG42 < 0 can avoid the fourth lens from being too curved, reduce the processing difficulty of the fourth lens, and at the same time enable the optical imaging lens group to have a better ability to balance chromatic aberration and distortion. More specifically, SAG41 and SAG42 may satisfy: -5 < SAG41 / SAG42 < -0.7;

[0053] In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional formula: 1 < T23 / CT3 < 3.2, where T23 is the distance between the second lens and the third lens on the optical axis, and CT3 is the central thickness of the third lens. The optical imaging lens group satisfying 1 < T23 / CT3 < 3.1 can effectively reduce the size of the optical imaging lens group, avoid the optical imaging lens group from being too large in volume, and at the same time reduce the assembly difficulty of the lens and achieve a high space utilization rate. More specifically, T23 and CT3 may satisfy: 1.01 < T23 / CT3 < 2.65.

[0054] In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional formula: 0.8 < f2 / f4 < 2, where f2 is the effective focal length of the second lens and f4 is the effective focal length of the fourth lens. The optical imaging lens group satisfying 0.8 < f2 / f4 < 2 can reasonably distribute the optical powers of the second lens and the fourth lens, prevent the optical powers of the second lens and the fourth lens from being too large, thereby reducing the sensitivity of the second lens and the fourth lens to the optical imaging lens group, and at the same time facilitating the optical imaging lens group to better balance aberrations. More specifically, f2 and f4 may satisfy: 0.83 < f2 / f4 < 1.52.

[0055] In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional formula: TTL / f < 1, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens group, and f is the total effective focal length of the optical imaging lens group. The optical imaging lens group satisfying TTL / f < 1 can control the total length of the optical imaging lens group within a certain range on the premise of ensuring a certain focal length, which is beneficial to the compactness of the optical imaging lens group, and at the same time is beneficial to preventing the excessive increase of aberration, and thus helps to improve the image quality. More specifically, TTL and f may satisfy: 0.85 < TTL / f < 0.95.

[0056] In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional formula: 0.3 < R1 / f1 < 0.7, where R1 is the radius of curvature of the object side surface of the first lens, and f1 is the effective focal length of the first lens. The optical imaging lens group satisfying 0.3 < R1 / f1 < 0.7 can reasonably distribute the optical power of the first lens, prevent the light rays from being bent too much, and is beneficial to the optical imaging lens group to better balance aberrations. More specifically, R1 and f1 may satisfy: 0.50 < R1 / f1 < 0.60.

[0057] In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional formula: -5 < f45 / f < 0, where f45 is the combined focal length of the fourth lens and the fifth lens, and f is the total effective focal length of the optical imaging lens group. The optical imaging lens group satisfying -5 < f45 / f < 0 can reasonably distribute the optical power of the fourth lens and the fifth lens, prevent the light rays from being bent too much, and is beneficial to correcting the field curvature of the optical imaging lens group and correcting the distortion of the optical imaging lens group. More specifically, f45 and f may satisfy: -3.7 < f45 / f < -0.8.

[0058] In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional formula: -3 < R10 / R4 < -1, where R10 is the radius of curvature of the image side surface of the fifth lens, and R4 is the radius of curvature of the image side surface of the second lens. The optical imaging lens group satisfying -3 < R10 / R4 < -1 helps to reasonably distribute the optical power of the second lens and the fifth lens, prevent the light rays from being bent too much, and is beneficial to the optical imaging lens group to better balance aberrations. More specifically, R10 and R4 may satisfy: -2.7 < R10 / R4 < -1.3.

[0059] In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional formula: 0.2 < CT3 / T34 < 0.7, where CT3 is the central thickness of the third lens, and T34 is the distance between the third lens and the fourth lens on the optical axis. The optical imaging lens group satisfying 0.2 < CT3 / T34 < 0.7 can effectively reduce the size of the optical imaging lens group, avoid the over-large volume of the optical imaging lens group, and at the same time reduce the assembly difficulty of the lenses and achieve a high space utilization rate. More specifically, CT3 and T34 may satisfy: 0.21 < CT3 / T34 < 0.60.

[0060] In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional formula: T23 / T34 < 1, where T23 is the distance between the second lens and the third lens on the optical axis, and T34 is the distance between the third lens and the fourth lens on the optical axis. The optical imaging lens group satisfying T23 / T34 < 1 is beneficial to the assembly of the optical imaging lens group. More specifically, T23 and T34 may satisfy 0.50 < T23 / T34 < 0.88.

[0061] In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional formula: T45 / (CT4 + CT5) < 0.5, where T45 is the distance between the fourth lens and the fifth lens on the optical axis, CT4 is the central thickness of the fourth lens, and CT5 is the central thickness of the fifth lens. The optical imaging lens group satisfying T45 / (CT4 + CT5) < 0.5 can effectively reduce the size of the optical imaging lens group, avoid the over-large volume of the optical imaging lens group, and at the same time reduce the assembly difficulty of the lenses and achieve a high space utilization rate. More specifically, T45, CT4, and CT5 may satisfy: T45 / (CT4 + CT5) < 0.15.

[0062] In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional formula: |SAG21×10 / CT2| < 1.2, where SAG21 is the axial distance between the intersection point of the object side of the second lens and the optical axis and the vertex of the effective radius of the object side of the second lens, and CT2 is the central thickness of the second lens. The optical imaging lens group satisfying |SAG21×10 / CT2| < 1.2 can avoid the second lens from being too curved, reduce the processing difficulty of the second lens, and at the same time balance the chromatic aberration and distortion of the optical imaging lens group better. More specifically, SAG21 and CT2 may satisfy: |SAG21×10 / CT2| < 1.05.

[0063] In an exemplary embodiment, the optical imaging lens group of the present application can satisfy the conditional formula: 0.5 < T34 / Tr7r10 < 1.2, where T34 is the axial distance between the third lens and the fourth lens, and Tr7r10 is the axial distance between the object side surface of the fourth lens and the image side surface of the fifth lens. The optical imaging lens group satisfying 0.5 < T34 / Tr7r10 < 1.2 can improve its space utilization rate and also help to ensure its imaging quality. More specifically, T34 and Tr7r10 can satisfy: 0.5 < T34 / Tr7r10 < 1.2.

[0064] In an exemplary embodiment, the optical imaging lens group of the present application can satisfy the conditional formula: 0.5 < DT11 / DT42 < 1, where DT11 is the effective semi-aperture of the object side surface of the first lens, DT42 is the effective semi-aperture of the image side surface of the fourth lens, and the values of the effective semi-apertures of the respective mirror surfaces from the object side surface of the third lens to the image side surface of the fifth lens increase in sequence. The optical imaging lens group satisfying 0.5 < DT11 / DT42 < 1 and satisfying DT31 < DT32 < DT41 < DT42 < DT51 < DT52 is beneficial to ensuring smooth convergence of light rays, avoiding excessive bending of light rays, and thus enabling the optical imaging lens group to have better image quality. More specifically, DT11 and DT42 can satisfy: 0.60 < DT11 / DT42 < 1.15.

[0065] In an exemplary embodiment, the optical imaging lens group of the present application can satisfy the conditional formula: 0 < SAG51 / CT5 < 0.5, where SAG51 is the axial distance between the intersection point of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens, and CT5 is the central thickness of the fifth lens. The optical imaging lens group satisfying 0 < SAG51 / CT5 < 0.5 can avoid excessive bending of the fifth lens, reduce the processing difficulty of the fifth lens, and at the same time achieve a better balance of chromatic aberration and distortion of the optical imaging lens group. More specifically, SAG51 and CT5 can satisfy: 0.08 < SAG51 / CT5 < 0.31.

[0066] In an exemplary embodiment, no filter element is provided between the image side surface of the fifth lens and the imaging surface of the optical imaging lens group. Usually, an independent filter is provided between the imaging surface of the optical imaging lens group and the lens closest to the imaging surface. The filter has a relatively large mass. The optical imaging lens group without an independent filter element has the characteristics of being lightweight and can reduce the manufacturing cost.

[0067] In an exemplary embodiment, an infrared cut-off film is deposited on at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the fifth lens. The cost of depositing an infrared cut-off film (IR film) on the lens of the optical imaging lens group is relatively low, and the mass of the optical imaging lens group is relatively light.

[0068] In an exemplary embodiment, the above optical imaging lens group may further include at least one aperture stop. The aperture stop can be disposed at an appropriate position as needed. For example, it can be disposed between the object side and the first lens.

[0069] The optical imaging lens group 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, central thickness of each lens, and the on-axis spacing between each lens, etc., the volume of the optical imaging lens group can be effectively reduced, the sensitivity of the optical imaging lens group can be decreased, and the processability of the optical imaging lens group can be improved, making the optical imaging lens group more conducive to production and processing and applicable to portable electronic products. At the same time, the optical imaging lens group of the present application also has excellent optical properties such as long focal length and good imaging quality.

[0070] In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object side surface of the first lens to the image side surface of the fifth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an 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 object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is an aspherical mirror surface. Optionally, both the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are aspherical mirror surfaces.

[0071] 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 group 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 group is not limited to including five lenses. If necessary, the optical imaging lens group may further include other numbers of lenses.

[0072] The specific embodiments of the optical imaging lens group applicable to the above embodiments will be further described below with reference to the accompanying drawings.

[0073] Example 1

[0074] The following refers to Figures 1 to 2D Describe the optical imaging lens group according to Embodiment 1 of the present application. Figure 1 The structural schematic diagram of the optical imaging lens group according to Embodiment 1 of the present application is shown.

[0075] like Figure 1 As shown, the optical imaging lens system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, and a fifth lens element E5. An IR film is provided on the object-side surface S5 of the third lens element E3.

[0076] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative focal power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being concave and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The optical imaging lens group has an imaging surface S11, and light from an object sequentially passes through each surface S1 to S10 and is ultimately imaged on the imaging surface S11.

[0077] Table 1 shows the basic parameters of the optical imaging lens assembly of Example 1, wherein the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0078]

[0079] Table 1

[0080] In Example 1, the total effective focal length f of the optical imaging lens assembly is 7.03 mm, the on-axis distance TTL from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 6.19 mm, and the half-diagonal length of the effective pixel area on the imaging surface S11, ImgH, is 2.29 mm.

[0081] In Example 1, the object-side surface and the image-side surface of any lens among the first lens E1 to the fifth lens E5 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0082]

[0083] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below lists the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39 10 , A 12 , A 14 , A 16 , A 18 and A20 .

[0084] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 4.3721E-03 -1.1774E-02 4.5094E-02 -9.6624E-02 1.2582E-01 -9.6808E-02 4.1957E-02 -9.0893E-03 6.9798E-04 S2 5.0281E-03 1.8478E-02 -1.7699E-02 6.0005E-03 3.4822E-02 -7.8984E-02 7.9000E-02 -3.8806E-02 7.3267E-03 S3 -3.3846E-02 1.0636E-01 -1.3827E-01 3.0659E-01 -6.0961E-01 8.3446E-01 -6.8935E-01 3.0168E-01 -5.4271E-02 S4 -4.7258E-02 1.4295E-01 -4.1587E-01 2.2641E+00 -7.1949E+00 1.4073E+01 -1.6312E+01 1.0266E+01 -2.7129E+00 S5 -1.3895E-01 1.6305E-01 -1.2542E-01 5.0469E-01 -8.1435E-01 5.9533E-01 -1.8302E-01 5.3054E-12 -4.8409E-12 S6 -6.6457E-02 1.0293E-01 1.6718E-01 -6.6388E-01 1.7391E+00 -2.6439E+00 2.2778E+00 -1.0532E+00 1.9893E-01 S7 -1.2388E-01 6.9167E-02 -3.6148E-02 1.9034E-02 1.0634E-02 -1.8666E-02 9.4330E-03 -2.1872E-03 1.9878E-04 S8 -5.2666E-02 5.0587E-02 -3.5436E-02 1.1846E-02 -1.7878E-04 -1.0400E-03 3.1256E-04 -3.7810E-05 1.4984E-06 S9 -1.1070E-01 1.6005E-01 -1.2107E-01 5.7970E-02 -1.7708E-02 3.4511E-03 -4.2083E-04 2.8853E-05 -7.9781E-07 S10 -9.2778E-02 5.2711E-02 -1.1630E-02 1.9773E-03 -1.6361E-04 -4.0014E-05 8.2787E-06 -5.7478E-07 7.0966E-08

[0085] Table 2

[0086] Figure 2A shows the astigmatism curve of the optical imaging lens group of Embodiment 1, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2B shows the distortion curve of the optical imaging lens group of Embodiment 1, which represents the distortion magnitude values corresponding to different image heights. Figure 2C shows the longitudinal chromatic aberration curve of the optical imaging lens group of Embodiment 1, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. Figure 2D shows the relative illumination curve of Embodiment 1, the relative illumination corresponding to different image heights on the imaging plane. According to Figures 2A to 2D it can be seen that the optical imaging lens group given in Embodiment 1 can achieve good imaging quality.

[0087] Example 2

[0088] The following refers to Figures 3 to 4D to describe the optical imaging lens group according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 3 shows a schematic structural diagram of the optical imaging lens group according to Embodiment 2 of the present application.

[0089] As Figure 3 shown, the optical imaging lens group sequentially includes, along the optical axis from the object side to the image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. An IR film is provided at the image side surface S2 of the second lens E2.

[0090] The first lens E1 has a positive optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface. The second lens E2 has a negative optical power, its object side surface S3 is a concave surface, and its image side surface S4 is a concave surface. The third lens E3 has a negative optical power, its object side surface S5 is a concave surface, and its image side surface S6 is a concave surface. The fourth lens E4 has a negative optical power, its object side surface S7 is a concave surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a positive optical power, its object side surface S9 is a convex surface, and its image side surface S10 is a convex surface. The optical imaging lens group has an imaging surface S11, and the light from the object sequentially passes through the surfaces S1 to S10 and finally forms an image on the imaging surface S11.

[0091] In Embodiment 2, the value of the total effective focal length f of the optical imaging lens group is 7.00 mm, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S11 is 6.19 mm, and the value of half of the diagonal length of the effective pixel region on the imaging surface S11, ImgH, is 2.29 mm.

[0092] Table 3 shows the basic parameter table of the optical imaging lens group of Embodiment 2, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 4 shows the higher-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.

[0093]

[0094] Table 3

[0095]

[0096]

[0097] Table 4

[0098] Figure 4A Shows the astigmatism curve of the optical imaging lens group of Embodiment 2, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4B Shows the distortion curve of the optical imaging lens group of Embodiment 2, which represents the distortion magnitude values corresponding to different image heights. Figure 4C Shows the longitudinal chromatic aberration curve of the optical imaging lens group of Embodiment 2, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. Figure 4D Shows the relative illumination curve of Embodiment 2, the relative illumination corresponding to different image heights on the imaging surface. According to Figures 4A to 4D It can be seen that the optical imaging lens group given in Embodiment 2 can achieve good imaging quality.

[0099] Example 3

[0100] The following refers to Figures 5 to 6D Describes the optical imaging lens group according to Embodiment 3 of the present application. Figure 5 Shows the structural schematic diagram of the optical imaging lens group according to Embodiment 3 of the present application.

[0101] As Figure 5 shown, the optical imaging lens group sequentially includes, from the object side to the image side along the optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. An IR film is provided at the object side surface S3 of the third lens E3.

[0102] The first lens E1 has a positive optical power. Its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a negative optical power. Its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a negative optical power. Its object side S5 is concave, and its image side S6 is concave. The fourth lens E4 has a negative optical power. Its object side S7 is concave, and its image side S8 is concave. The fifth lens E5 has a positive optical power. Its object side S9 is convex, and its image side S10 is convex. The optical imaging lens group has an imaging surface S11. The light from the object sequentially passes through the surfaces S1 to S10 and finally forms an image on the imaging surface S11.

[0103] In Embodiment 3, the value of the total effective focal length f of the optical imaging lens group is 7.04 mm. The on-axis distance TTL from the object side S1 of the first lens E1 to the imaging surface S11 is 6.26 mm. The value of half of the diagonal length of the effective pixel region on the imaging surface S11, ImgH, is 2.29 mm.

[0104] Table 5 shows the basic parameter table of the optical imaging lens group of Embodiment 3, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table ⑥ shows the higher-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.

[0105] <l

[0106]

[0107] Table 5

[0108] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 5.7404E-03 -1.0457E-02 4.4372E-02 -9.6596E-02 1.2602E-01 -9.6715E-02 4.1971E-02 -9.1013E-03 6.8614E-04 S2 5.9156E-03 1.7761E-02 -1.7823E-02 5.9338E-03 3.4771E-02 -7.9000E-02 7.9010E-02 -3.8787E-02 7.3443E-03 S3 -3.5734E-02 1.0436E-01 -1.4102E-01 3.0541E-01 -6.0913E-01 8.3561E-01 -6.8840E-01 3.0198E-01 -5.4660E-02 S4 -5.2706E-02 1.9735E-01 -7.3517E-01 3.4298E+00 -1.0070E+01 1.8374E+01 -1.9916E+01 1.1778E+01 -2.9210E+00 S5 -1.3637E-01 1.4899E-01 -1.2345E-01 5.1198E-01 -8.1339E-01 5.9464E-01 -1.7188E-01 1.1821E-11 -2.6331E-12 S6 -8.8251E-02 1.0197E-01 1.6372E-01 -6.7053E-01 1.7389E+00 -2.6368E+00 2.2857E+00 -1.0532E+00 1.9893E-01 S7 -1.2891E-01 6.6997E-02 -3.7167E-02 1.8901E-02 1.0668E-02 -1.8641E-02 9.4409E-03 -2.1867E-03 1.9724E-04 S8 -5.3148E-02 4.9557E-02 -3.5111E-02 1.1847E-02 -1.9729E-04 -1.0461E-03 3.1142E-04 -3.7799E-05 1.6323E-06 S9 -1.1520E-01 1.5917E-01 -1.2132E-01 5.7963E-02 -1.7700E-02 3.4541E-03 -4.2019E-04 2.8910E-05 -8.2642E-07 S10 -7.6755E-02 4.6751E-02 -1.2054E-02 2.0157E-03 -1.4943E-04 -3.7525E-05 8.5735E-06 -5.6100E-07 6.6079E-08

[0109] Table 6

[0110] Figure 6A Shows the astigmatism curve of the optical imaging lens group of Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6B Shows the distortion curve of the optical imaging lens group of Embodiment 3, which represents the distortion magnitude values corresponding to different image heights. Figure 6C Shows the longitudinal chromatic aberration curve of the optical imaging lens group of Embodiment 3, which represents the deviation of different image heights of the light rays on the imaging surface after passing through the lens. Figure 6D Shows the relative illumination curve of Embodiment 3, the relative illumination corresponding to different image heights on the imaging surface. According to Figures 6A to 6D It can be seen that the optical imaging lens group given in Embodiment 3 can achieve good imaging quality.

[0111] Example 4

[0112] The following refers toFigures 7 to 8D Describes an optical imaging lens group according to Embodiment 4 of the present application. Figure 7 Shows a schematic structural diagram of the optical imaging lens group according to Embodiment 4 of the present application.

[0113] As Figure 7 Shown, the optical imaging lens group sequentially includes, from the object side to the image side along the optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. An IR film is provided at the image side surface S2 of the second lens E2.

[0114] The first lens E1 has a positive optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a convex surface. The second lens E2 has a negative optical power, its object side surface S3 is a concave surface, and its image side surface S4 is a concave surface. The third lens E3 has a negative optical power, its object side surface S5 is a concave surface, and its image side surface S6 is a convex surface. The fourth lens E4 has a negative optical power, its object side surface S7 is a concave surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a positive optical power, its object side surface S9 is a convex surface, and its image side surface S10 is a convex surface. The optical imaging lens group has an imaging surface S11, and light from an object sequentially passes through each surface S1 to S10 and finally forms an image on the imaging surface S11.

[0115] In Embodiment 4, the value of the total effective focal length f of the optical imaging lens group is 7.03 mm, the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S11 is 6.24 mm, and the value of half of the diagonal length of the effective pixel region on the imaging surface S11, ImgH, is 2.29 mm.

[0116] Table 7 shows the basic parameter table of the optical imaging lens group of Embodiment 4, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 8 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 4, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0117]

[0118]

[0119] Table 7

[0120] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 5.5627E-03 -1.1667E-02 4.5102E-02 -9.6500E-02 1.2591E-01 -9.6780E-02 4.1960E-02 -9.0929E-03 6.9502E-04 S2 5.3401E-03 1.7940E-02 -1.7724E-02 6.0633E-03 3.4847E-02 -7.8988E-02 7.8990E-02 -3.8807E-02 7.3393E-03 S3 -3.5086E-02 1.0493E-01 -1.4006E-01 3.0570E-01 -6.0954E-01 8.3500E-01 -6.8882E-01 3.0190E-01 -5.4466E-02 S4 -6.0432E-02 2.8934E-01 -1.2488E+00 5.0789E+00 -1.3012E+01 2.1056E+01 -2.0610E+01 1.1129E+01 -2.5472E+00 S5 -1.3465E-01 1.6249E-01 -1.2370E-01 5.0535E-01 -8.1511E-01 5.9728E-01 -1.7632E-01 8.9927E-12 -3.7836E-12 S6 -6.9133E-02 1.0387E-01 1.6473E-01 -6.6616E-01 1.7399E+00 -2.6405E+00 2.2817E+00 -1.0532E+00 1.9893E-01 S7 -1.2804E-01 6.8460E-02 -3.6190E-02 1.9070E-02 1.0652E-02 -1.8662E-02 9.4329E-03 -2.1880E-03 1.9813E-04 S8 -5.2355E-02 5.0297E-02 -3.5393E-02 1.1843E-02 -1.8401E-04 -1.0418E-03 3.1224E-04 -3.7784E-05 1.5535E-06 S9 -1.1357E-01 1.5932E-01 -1.2115E-01 5.7971E-02 -1.7705E-02 3.4524E-03 -4.2050E-04 2.8916E-05 -7.9179E-07 S10 -9.5991E-02 5.1477E-02 -1.1706E-02 1.9836E-03 -1.6180E-04 -3.9757E-05 8.2841E-06 -5.8080E-07 6.9703E-08

[0121] Table 8

[0122] Figure 8A Shows the astigmatism curve of the optical imaging lens group of Embodiment 4, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8B Shows the distortion curve of the optical imaging lens group of Embodiment 4, which represents the distortion magnitude values corresponding to different image heights.Figure 8C Shows the longitudinal chromatic aberration curve of the optical imaging lens group of Embodiment 4, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. Figure 8D Shows the relative illumination curve of Embodiment 4, the relative illumination corresponding to different image heights on the imaging plane. According to Figures 8A to 8D It can be seen that the optical imaging lens group given in Embodiment 4 can achieve good imaging quality.

[0123] Example 5

[0124] The following refers to Figures 9 to 10D describes the optical imaging lens group according to Embodiment 5 of the present application. Figure 9 Shows a schematic structural diagram of the optical imaging lens group according to Embodiment 5 of the present application.

[0125] As Figure 9 shown, the optical imaging lens group sequentially includes, from the object side to the image side along the optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. An IR film is provided on the image side surface S2 of the second lens E2.

[0126] The first lens E1 has a positive optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface. The second lens E2 has a negative optical power, its object side surface S3 is a concave surface, and its image side surface S4 is a concave surface. The third lens E3 has a positive optical power, its object side surface S5 is a concave surface, and its image side surface S6 is a convex surface. The fourth lens E4 has a negative optical power, its object side surface S7 is a concave surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a positive optical power, its object side surface S9 is a concave surface, and its image side surface S10 is a convex surface. The optical imaging lens group has an imaging surface S11, and the light from the object sequentially passes through the surfaces S1 to S10 and finally forms an image on the imaging surface S11.

[0127] In Embodiment 5, the value of the total effective focal length f of the optical imaging lens group is 7.03 mm, the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S11 is 6.58 mm, and the value of half of the diagonal length of the effective pixel region on the imaging surface S11, ImgH, is 2.29 mm.

[0128] Table 9 shows the basic parameter table of the optical imaging lens group of Embodiment 5, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 10 shows the higher-order term coefficients that can be used 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.

[0129]

[0130] Table 9

[0131] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 7.2408E-03 -8.6825E-03 4.3960E-02 -9.6512E-02 1.2620E-01 -9.6636E-02 4.1981E-02 -9.1087E-03 6.8289E-04 S2 2.3949E-03 1.7886E-02 -1.5621E-02 7.7761E-03 3.5624E-02 -7.8776E-02 7.8964E-02 -3.8928E-02 7.1617E-03 S3 -2.6341E-02 1.0654E-01 -1.4112E-01 3.0631E-01 -6.0740E-01 8.3708E-01 -6.8775E-01 3.0187E-01 -5.5198E-02 S4 -1.3879E-02 1.3600E-01 -3.9424E-01 1.7208E+00 -4.7544E+00 7.9399E+00 -7.7019E+00 4.0097E+00 -8.6096E-01 S5 -1.4382E-01 9.6887E-02 -1.9044E-01 5.1120E-01 -7.7052E-01 6.2105E-01 -2.1359E-01 1.4565E-02 -5.2396E-12 S6 -9.8985E-02 3.8059E-02 1.2353E-01 -6.6831E-01 1.7549E+00 -2.6302E+00 2.2759E+00 -1.0555E+00 2.0345E-01 S7 -1.1361E-01 3.5839E-02 -4.3948E-02 1.9623E-02 1.2326E-02 -1.8098E-02 9.2159E-03 -2.4420E-03 3.1419E-04 S8 -2.9290E-02 4.0152E-02 -3.4414E-02 1.1974E-02 -2.4203E-04 -1.0554E-03 3.1241E-04 -3.6990E-05 1.6879E-06 S9 -9.2260E-02 1.6068E-01 -1.2182E-01 5.7810E-02 -1.7708E-02 3.4599E-03 -4.1800E-04 2.9254E-05 -9.7728E-07 S10 -7.4856E-02 4.1743E-02 -1.1660E-02 2.2652E-03 -1.2992E-04 -4.1434E-05 7.0850E-06 -7.9929E-07 9.9996E-08

[0132] Table 10

[0133] Figure 10A Shows the astigmatism curve of the optical imaging lens group of Example 5, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 10B Shows the distortion curve of the optical imaging lens group of Example 5, which represents the distortion magnitude values corresponding to different image heights. Figure 10C Shows the longitudinal chromatic aberration curve of the optical imaging lens group of Example 5, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. Figure 10D Shows the relative illumination curve of Example 5, the relative illumination corresponding to different image heights on the imaging plane. According to Figures 10A to 10D It can be seen that the optical imaging lens group given in Example 5 can achieve good imaging quality.

[0134] Example 6

[0135] The following refers to Figures 11 to 12D Describes an optical imaging lens group according to Embodiment 6 of the present application. Figure 11 Shows a schematic structural diagram of the optical imaging lens group according to Embodiment 6 of the present application.

[0136] As Figure 11 Shown, the optical imaging lens group sequentially includes, from the object side to the image side along the optical axis: a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. An IR film is provided on the image side surface S2 of the second lens E2.

[0137] The first lens E1 has a positive optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a convex surface. The second lens E2 has a negative optical power, its object side surface S3 is a concave surface, and its image side surface S4 is a concave surface. The third lens E3 has a negative optical power, its object side surface S5 is a concave surface, and its image side surface S6 is a concave surface. The fourth lens E4 has a negative optical power, its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a positive optical power, its object side surface S9 is a convex surface, and its image side surface S10 is a convex surface. The optical imaging lens group has an imaging surface S11, and the light from the object sequentially passes through the surfaces S1 to S10 and finally forms an image on the imaging surface S11.

[0138] In Embodiment 6, the value of the total effective focal length f of the optical imaging lens group is 7.02 mm, the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S11 is 6.49 mm, and the value of half of the diagonal length of the effective pixel region on the imaging surface S11, ImgH, is 2.29 mm.

[0139] Table 11 shows the basic parameter table of the optical imaging lens group of Example 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 Example 6, where each aspherical surface type can be defined by formula (1) given in the above Example 1.

[0140]

[0141] Table 11

[0142] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 6.9132E-03 -9.1446E-03 4.4066E-02 -9.6628E-02 1.2609E-01 -9.6670E-02 4.1981E-02 -9.1046E-03 6.8221E-04 S2 6.2386E-03 1.6776E-02 -1.7590E-02 6.4812E-03 3.5143E-02 -7.8840E-02 7.9038E-02 -3.8823E-02 7.2812E-03 S3 -2.8675E-02 1.0833E-01 -1.4021E-01 3.0563E-01 -6.0864E-01 8.3620E-01 -6.8801E-01 3.0206E-01 -5.4835E-02 S4 -4.3538E-02 1.7362E-01 -4.7314E-01 2.0418E+00 -5.8130E+00 1.0315E+01 -1.0807E+01 6.1355E+00 -1.4517E+00 S5 -1.3672E-01 1.2442E-01 -1.5407E-01 5.0832E-01 -7.9497E-01 6.0963E-01 -1.8579E-01 1.0771E-11 -3.0353E-12 S6 -1.0345E-01 7.4381E-02 1.4242E-01 -6.6974E-01 1.7462E+00 -2.6349E+00 2.2813E+00 -1.0502E+00 1.9893E-01 S7 -1.1162E-01 4.3339E-02 -3.5138E-02 2.0475E-02 1.0753E-02 -1.8787E-02 9.3814E-03 -2.1877E-03 2.0785E-04 S8 -3.9213E-02 4.8680E-02 -3.5401E-02 1.1746E-02 -2.2090E-04 -1.0490E-03 3.1129E-04 -3.7603E-05 1.7616E-06 S9 -9.7409E-02 1.5614E-01 -1.2165E-01 5.7963E-02 -1.7690E-02 3.4570E-03 -4.1963E-04 2.8933E-05 -8.6188E-07 S10 -4.9004E-02 3.5369E-02 -1.2019E-02 2.1839E-03 -1.1753E-04 -3.4216E-05 8.4077E-06 -7.1942E-07 1.7278E-08

[0143] Table 12

[0144] Figure 12A shows the astigmatism curve of the optical imaging lens group of Example 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12B shows the distortion curve of the optical imaging lens group of Example 6, which represents the distortion magnitude values corresponding to different image heights. Figure 12C shows the longitudinal chromatic aberration curve of the optical imaging lens group of Example 6, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. Figure 12D shows the relative illumination curve of Example 6, the relative illumination corresponding to different image heights on the imaging plane. According to Figures 12A to 12D it can be known that the optical imaging lens group given in Example 6 can achieve good imaging quality.

[0145] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 13.

[0146] Conditional / Example 1 2 3 4 5 6 SAG41 / SAG42 -1.01 -0.96 -0.82 -0.79 -4.57 -3.47 T23 / CT3 2.36 2.94 3.10 2.67 1.29 1.46 f2 / f4 1.21 1.51 1.38 1.45 0.99 0.85 TTL / f 0.88 0.88 0.89 0.89 0.94 0.93 R1 / f1 0.55 0.54 0.54 0.55 0.53 0.55 f45 / f -1.76 -2.03 -3.51 -2.07 -0.93 -3.64 R10 / R4 -2.46 -2.34 -2.63 -2.55 -1.44 -1.38 CT3 / T34 0.26 0.22 0.24 0.24 0.41 0.57 T23 / T34 < 1 0.72 0.64 0.73 0.64 0.52 0.84 T45 / (CT4 + CT5) 0.10 0.12 0.11 0.11 0.11 0.08 |SAG21×10 / CT2| 0.38 0.16 1.03 0.02 0.15 0.54 T34 / Tr7r10 1.14 0.99 0.92 0.94 0.89 0.64 DT11 / DT42 0.79 0.75 0.72 0.73 0.74 0.72 SAG51 / CT5 0.22 0.30 0.25 0.27 0.10 0.13

[0147] Table 13

[0148] This application also provides an imaging device, which is provided with an electronic photosensitive element for imaging. The electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens group described above.

[0149] The above description is only a preferred embodiment of the present application and an 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, but 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 technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. An optical imaging lens group, characterized in that, It sequentially includes from the object side to the image side along the optical axis: A first lens with positive optical power, whose object side is convex; A second lens with negative optical power, whose image side is concave; A third lens with positive or negative optical power, whose object side is concave; A fourth lens with negative optical power, whose image side is concave; A fifth lens with positive optical power, whose image side is convex; Wherein, the axial distance SAG41 between the intersection point of the object side of the fourth lens and the optical axis and the vertex of the effective radius of the object side of the fourth lens and the axial distance SAG42 between the intersection point of the image side of the fourth lens and the optical axis and the vertex of the effective radius of the image side of the fourth lens satisfy: -4.57 ≤ SAG41 / SAG42 ≤ -0.79; The interval distance T23 between the second lens and the third lens on the optical axis and the central thickness CT3 of the third lens satisfy: 1.29 ≤ T23 / CT3 ≤ 3.10; The interval distance T34 between the third lens and the fourth lens on the optical axis and the interval distance Tr7r10 between the object side of the fourth lens and the image side of the fifth lens on the optical axis satisfy: 0.64 ≤ T34 / Tr7r10 ≤ 1.14; The number of lenses with optical power in the optical imaging lens group is five.

2. The optical imaging lens group according to claim 1, wherein The effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy: 0.83 < f2 / f4 < 1.

52.

3. The optical imaging lens group according to claim 1, wherein, The interval distance TTL between the object side of the first lens and the imaging surface of the optical imaging lens group on the optical axis and the total effective focal length f of the optical imaging lens group satisfy: 0.85 < TTL / f < 0.

95.

4. The optical imaging lens group according to claim 1, characterized in that, The curvature radius R1 of the object side of the first lens and the effective focal length f1 of the first lens satisfy: 0.50 < R1 / f1 < 0.

60.

5. The optical imaging lens group according to claim 1, wherein, The combined focal length f45 of the fourth lens and the fifth lens and the total effective focal length f of the optical imaging lens group satisfy: -3.64 ≤ f45 / f ≤ -0.

93.

6. The optical imaging lens group according to claim 1, wherein, The curvature radius R10 of the image side of the fifth lens and the curvature radius R4 of the image side of the second lens satisfy: -2.63 ≤ R10 / R4 ≤ -1.

38.

7. The optical imaging lens group according to claim 1, characterized in that, The central thickness CT3 of the third lens and the interval distance T34 between the third lens and the fourth lens on the optical axis satisfy: 0.21 < CT3 / T34 < 0.

60.

8. The optical imaging lens group according to claim 1, characterized in that, The interval distance T45 between the fourth lens and the fifth lens on the optical axis, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens satisfy: 0.08 ≤ T45 / (CT4 + CT5) < 0.

15.

9. The optical imaging lens group according to claim 1, characterized in that, The axial distance SAG21 between the intersection point of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens and the central thickness CT2 of the second lens satisfy: 0.02 ≤ SAG21 × 10 / CT2 <1.

05.

10. The optical imaging lens group according to claim 1, characterized in that, The values of the effective semi-apertures of the respective mirror surfaces from the object side of the third lens to the image side of the fifth lens increase sequentially; The effective semi-aperture DT11 of the object side of the first lens and the effective semi-aperture DT42 of the image side of the fourth lens satisfy: 0.72 ≤ DT11 / DT42 ≤ 0.

79.

11. The optical imaging lens group according to claim 1, wherein, The axial distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens and the central thickness CT5 of the fifth lens satisfy: 0.08 < SAG51 / CT5 < 0.

31.

12. The optical imaging lens group according to any one of claims 1 to 11, characterized in that, No filter element is provided between the image side surface of the fifth lens and the imaging surface of the optical imaging lens group.

13. The optical imaging lens group according to claim 12, characterized in that, An infrared cut-off film is coated on at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the fifth lens.

14. The optical imaging lens group according to claim 1, characterized in that, The interval distance T23 between the second lens and the third lens on the optical axis and the interval distance T34 between the third lens and the fourth lens on the optical axis satisfy 0.50 < T23 / T34 < 0.

88.

15. Optical imaging lens group, characterized in that, In order from the object side to the image side along the optical axis, it includes: A first lens with positive optical power, whose object side surface is convex; A second lens with negative optical power, whose image side surface is concave; A third lens with positive or negative optical power, whose object side surface is concave; A fourth lens with negative optical power, whose image side surface is concave; A fifth lens with positive optical power, whose image side surface is convex; Among them, the axial distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens and the axial distance SAG42 between the intersection of the image side surface of the fourth lens and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens satisfy: -4.57 ≤ SAG41 / SAG42 ≤ -0.79; The axial distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens and the central thickness CT2 of the second lens satisfy: 0.02 ≤ SAG21×10 / CT2 <1.05; The interval distance T34 between the third lens and the fourth lens on the optical axis and the interval distance Tr7r10 between the object side surface of the fourth lens and the image side surface of the fifth lens on the optical axis satisfy: 0.64 ≤ T34 / Tr7r10 ≤ 1.14; The number of lenses with optical power in the optical imaging lens group is five.

16. The optical imaging lens group according to claim 15, characterized in that, The effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy: 0.83 < f2 / f4 < 1.

52.

17. The optical imaging lens group according to claim 15, wherein The interval distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging lens group on the optical axis and the total effective focal length f of the optical imaging lens group satisfy: 0.85 < TTL / f < 0.

95.

18. The optical imaging lens group according to claim 15, wherein The radius of curvature R1 of the object side surface of the first lens and the effective focal length f1 of the first lens satisfy: 0.50 < R1 / f1 < 0.

60.

19. The optical imaging lens group according to claim 15, characterized in that, The combined focal length f45 of the fourth lens and the fifth lens and the total effective focal length f of the optical imaging lens group satisfy: -3.64 ≤ f45 / f ≤ -0.

93.

20. The optical imaging lens group according to claim 15, characterized in that, The radius of curvature R10 of the image side surface of the fifth lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -2.63 ≤ R10 / R4 ≤ -1.

38.

21. The optical imaging lens group according to claim 15, characterized in that, The central thickness CT3 of the third lens and the interval distance T34 between the third lens and the fourth lens on the optical axis satisfy: 0.21 < CT3 / T34 < 0.

60.

22. The optical imaging lens group according to claim 15, wherein, The axial interval distance T45 between the fourth lens and the fifth lens, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens satisfy: 0.08 ≤ T45 / (CT4 + CT5) < 0.

15.

23. The optical imaging lens group according to claim 22, characterized in that, The axial interval distance T23 between the second lens and the third lens and the central thickness CT3 of the third lens satisfy: 1.29 ≤ T23 / CT3 ≤ 3.

10.

24. The optical imaging lens group according to claim 15, characterized in that, The effective semi-aperture values of the respective mirror surfaces from the object side surface of the third lens to the image side surface of the fifth lens increase in sequence; The effective semi-aperture DT11 of the object side surface of the first lens and the effective semi-aperture DT42 of the image side surface of the fourth lens satisfy: 0.72 ≤ DT11 / DT42 ≤ 0.

79.

25. The optical imaging lens group according to claim 15, characterized in that, The axial distance SAG51 between the intersection point of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens and the central thickness CT5 of the fifth lens satisfy: 0.08 < SAG51 / CT5 < 0.

31.

26. The optical imaging lens group according to any one of claims 15 to 25, characterized in that, No filter element is provided between the image side surface of the fifth lens and the imaging surface of the optical imaging lens group.

27. The optical imaging lens group according to claim 26, wherein An infrared cut-off film is coated on at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the fifth lens.

28. The optical imaging lens group according to claim 15, wherein The axial interval distance T23 between the second lens and the third lens and the axial interval distance T34 between the third lens and the fourth lens satisfy 0.50 < T23 / T34 < 0.88.

Images