An optical imaging lens

Abstract

The present invention discloses an optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis: a first lens with a positive optical power; a second lens with a negative optical power, whose object side is convex and image side is concave; a third lens with an optical power, whose object side is concave; and a fourth lens with an optical power; wherein, the distance TTL from the object side of the first lens of the optical imaging lens to the imaging surface on the optical axis and the effective focal length f of the optical imaging lens satisfy: TTL / f < 1.1; the distance BFL from the image side of the last lens to the imaging surface on the optical axis satisfies: 5.0 mm < BFL < 12.0 mm. This condition constraint enables the system to obtain a longer focal length while ensuring miniaturization, which helps to improve the ability of the lens to highlight the main body and the ability to photograph distant scenes. By constraining the distance from the image side of the last lens to the imaging surface on the optical axis, the lens has a large telescopic length, and while obtaining a long focal length, it is more suitable for ultra-thin electronic devices.

Description

Technical Field

[0001] The present invention belongs to the field of optical imaging, and in particular relates to an optical imaging lens comprising four lenses. Background Art

[0002] With the rapid development of science and technology, portable electronic devices such as mobile phones and tablets are rapidly popular among the crowd; professional photographic equipment such as SLR lenses and digital cameras are expensive, not easy to carry, and difficult to meet people's diverse usage scenarios and needs; therefore, integrating high-quality photographic systems on electronic products such as mobile phones and tablets has become a general trend. In order to improve competitiveness, smartphone manufacturers have put forward more and higher requirements for mobile phone lenses, especially in high-end and flagship models, which often use a variety of lenses such as large image planes, wide angles, and telephoto lenses. Among them, telephoto lenses have longer focal lengths and smaller viewing angles, which can highlight the subject of the photo in a smaller picture; small distortion can better restore the original outline proportions of the subject of the photo and reduce distortion; small depth of field can reduce the depth of distant and near scenes. However, telephoto lenses are generally long, and in order to ensure portability and aesthetics, smartphones tend to be ultra-thin. Based on the above background, the present invention proposes a four-piece telephoto lens with a novel structure. Under the premise of meeting the long focal length, a larger lens telescopic length is reserved. The lens is extended when taking pictures, and the lens is retracted when the mobile phone is not in use for daily photography, which better solves the incompatibility problem of ultra-thin mobile phones with telephoto lenses. Summary of the invention

[0003] The present application aims to provide an optical imaging lens composed of four lenses, which has the characteristics of a large lens telescopic length.

[0004] The present application provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis:

[0005] a first lens having positive optical power;

[0006] The second lens has a negative optical power, and its object side surface is convex and its image side surface is concave;

[0007] a third lens element having optical power and having a concave object-side surface; and

[0008] a fourth lens having optical power;

[0009] Wherein, the distance TTL from the object side of the first lens of the optical imaging lens to the imaging plane on the optical axis and the effective focal length f of the optical imaging lens satisfy: TTL / f<1.1;

[0010] The distance BFL from the image side of the last lens to the imaging surface on the optical axis meets the following requirements: 5.0mm <BFL<12.0mm。

[0011] According to one embodiment of the present application, the effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: <f / f1+f / f2<0.5。

[0012] According to one embodiment of the present application, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the edge thickness ET1 of the first lens and the edge thickness ET2 of the second lens satisfy: 1.0 <ET2 / CT2-ET1 / CT1<1.5。

[0013] According to one embodiment of the present application, the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy: <f12 / f34<1.0。

[0014] According to one embodiment of the present application, the center thickness CT1 of the first lens on the optical axis and the air interval T12 between the first lens and the second lens on the optical axis satisfy: <T12×50 / CT1<1.0。

[0015] According to one embodiment of the present application, the sum of the air interval T23 on the optical axis between the second lens and the third lens and the air interval ΣAT on the optical axis between any two adjacent lenses from the first lens to the fourth lens satisfies: <T23 / ΣAT<1.0。

[0016] According to one embodiment of the present application, the edge thickness ET3 of the third lens and the maximum effective radius DT31 of the object side of the third lens satisfy: <ET3 / DT31<1.0。

[0017] According to one embodiment of the present application, the on-axis distance SAG11 between the intersection of the first lens object side surface and the optical axis to the effective radius vertex of the first lens object side surface and the on-axis distance SAG22 between the intersection of the second lens image side surface and the optical axis to the effective radius vertex of the second lens image side surface satisfies: 0.5 <SAG22 / SAG11<1.0。

[0018] According to one embodiment of the present application, the on-axis distance SAG21 between the intersection of the second lens object side and the optical axis to the effective radius vertex of the second lens object side and the on-axis distance SAG41 between the intersection of the fourth lens object side and the optical axis to the effective radius vertex of the fourth lens object side satisfy: 0 <SAG21 / (SAG21+SAG41)<1.0。

[0019] According to one embodiment of the present application, the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the maximum effective radius DT32 of the image side of the third lens, and the maximum effective radius DT42 of the image side of the fourth lens satisfy: <CT3 / DT32+CT4 / DT42<1.0。

[0020] According to one embodiment of the present application, the curvature radius R1 of the object side surface of the first lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: <R1 / (R3+R4)<1.0。

[0021] According to one embodiment of the present application, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.3 <R6 / (R5+R6)<1.3。

[0022] According to one embodiment of the present application, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.3 <R8 / (R7+R8)<1.3。

[0023] According to one embodiment of the present application, the object-side surface of the fourth lens element having optical power is convex.

[0024] According to one embodiment of the present application, half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: ImgH>3mm.

[0025] According to one embodiment of the present application, the entrance pupil diameter EPD of the optical imaging lens, half the diagonal length of the effective pixel area on the imaging plane ImgH, and the effective focal length f of the optical imaging lens satisfy: f / EPD-ImgH / f<2.

[0026] The present application also provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis:

[0027] a first lens having positive optical power;

[0028] The second lens has a negative optical power, and its object side surface is convex and its image side surface is concave;

[0029] a third lens element having optical power and having a concave object-side surface; and

[0030] a fourth lens having optical power;

[0031] Among them, half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfies: ImgH>3mm;

[0032] An entrance pupil diameter EPD of the optical imaging lens, half of the diagonal length of an effective pixel area on an imaging surface ImgH, and an effective focal length f of the optical imaging lens satisfy: f / EPD-ImgH / f<2.

[0033] According to one embodiment of the present application, the effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: <f / f1+f / f2<0.5。

[0034] According to one embodiment of the present application, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the edge thickness ET1 of the first lens and the edge thickness ET2 of the second lens satisfy: 1.0 <ET2 / CT2-ET1 / CT1<1.5。

[0035] According to one embodiment of the present application, the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy: <f12 / f34<1.0。

[0036] According to one embodiment of the present application, the center thickness CT1 of the first lens on the optical axis and the air interval T12 between the first lens and the second lens on the optical axis satisfy: <T12×50 / CT1<1.0。

[0037] According to one embodiment of the present application, the sum of the air interval T23 on the optical axis between the second lens and the third lens and the air interval ΣAT on the optical axis between any two adjacent lenses from the first lens to the fourth lens satisfies: <T23 / ΣAT<1.0。

[0038] According to one embodiment of the present application, the edge thickness ET3 of the third lens and the maximum effective radius DT31 of the object side of the third lens satisfy: <ET3 / DT31<1.0。

[0039] According to one embodiment of the present application, the on-axis distance SAG11 between the intersection of the first lens object side surface and the optical axis to the effective radius vertex of the first lens object side surface and the on-axis distance SAG22 between the intersection of the second lens image side surface and the optical axis to the effective radius vertex of the second lens image side surface satisfies: 0.5 <SAG22 / SAG11<1.0。

[0040] According to one embodiment of the present application, the on-axis distance SAG21 between the intersection of the second lens object side and the optical axis to the effective radius vertex of the second lens object side and the on-axis distance SAG41 between the intersection of the fourth lens object side and the optical axis to the effective radius vertex of the fourth lens object side satisfy: 0 <SAG21 / (SAG21+SAG41)<1.0。

[0041] According to one embodiment of the present application, the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the maximum effective radius DT32 of the image side of the third lens, and the maximum effective radius DT42 of the image side of the fourth lens satisfy: <CT3 / DT32+CT4 / DT42<1.0。

[0042] According to one embodiment of the present application, the curvature radius R1 of the object side surface of the first lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: <R1 / (R3+R4)<1.0。

[0043] According to one embodiment of the present application, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.3 <R6 / (R5+R6)<1.3。

[0044] According to one embodiment of the present application, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.3 <R8 / (R7+R8)<1.3。

[0045] According to one embodiment of the present application, the object-side surface of the fourth lens element having optical power is convex.

[0046] According to one embodiment of the present application, the distance TTL from the object side surface of the first lens element of the optical imaging lens to the imaging surface on the optical axis and the effective focal length f of the optical imaging lens satisfy: TTL / f<1.1.

[0047] According to one embodiment of the present application, the distance BFL from the image side of the last lens to the imaging surface on the optical axis satisfies: 5.0 mm <BFL<12.0mm。

[0048] Beneficial effects of the present invention:

[0049] The optical imaging lens provided by the present invention includes multiple lenses, such as the first lens to the fourth lens. By constraining the ratio range of the total length of the optical imaging system to the focal length, the system can obtain a longer focal length while ensuring miniaturization, which helps to improve the lens's ability to highlight the subject and shoot distant scenes; by constraining the distance from the image side of the last lens to the imaging surface on the optical axis, the lens has a larger telescopic length, which is more suitable for ultra-thin electronic devices while obtaining a long focal length; by constraining the maximum half-field angle of the imaging system and controlling the effective focal length of the imaging system, the imaging effect of the system with a large image surface is achieved, thereby having higher optical performance and better processing technology; by constraining the ratio of the effective focal length of the imaging system to the entrance pupil diameter, the imaging system F number is small, which can ensure that the system has a large aperture and has good imaging quality even in a dark environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 Schematic diagram of the structure of a lens assembly of an optical imaging lens embodiment 1 of the present invention;

[0052] Figure 2a to Figure 2d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens embodiment 1 of the present invention;

[0053] Figure 3 Schematic diagram of the lens group structure of Embodiment 2 of the optical imaging lens of the present invention;

[0054] Figures 4a to 4d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 2 of the optical imaging lens of the present invention;

[0055] Figure 5 Schematic diagram of the lens group structure of Embodiment 3 of the optical imaging lens of the present invention;

[0056] Figures 6a to 6d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 3 of the optical imaging lens of the present invention;

[0057] Figure 7 Schematic diagram of the lens group structure of Embodiment 4 of the optical imaging lens of the present invention;

[0058] Figures 8a to 8d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 4 of the optical imaging lens of the present invention;

[0059] Fig. 9 Schematic diagram of the lens group structure of Embodiment 5 of the optical imaging lens of the present invention;

[0060] Figures 10a to 10d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 5 of the optical imaging lens of the present invention;

[0061] Fig.11 Schematic diagram of the structure of a lens group of an optical imaging lens embodiment 6 of the present invention;

[0062] Figures 12a to 12d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 6 of the optical imaging lens of the present invention;

[0063] Fig.13 Schematic diagram of the structure of a lens group of an optical imaging lens embodiment 7 of the present invention;

[0064] Figures 14a to 14d They are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 7 of the present invention. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0066] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0067] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0068] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0069] In the description of the present invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0070] 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 commonly used dictionaries, should be interpreted as having a meaning that is 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.

[0071] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0072] Exemplary Embodiments

[0073] The optical imaging lens according to the exemplary embodiment of the present invention includes four lenses, which are sequentially arranged from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, and a fourth lens. Among them, each lens is independent of each other, and there is an air gap between the lenses on the optical axis.

[0074] In this exemplary embodiment, the distance TTL from the object side surface of the first lens of the optical imaging lens to the imaging surface on the optical axis and the effective focal length f of the optical imaging lens satisfy: TTL / f < 1.1. This condition constraint enables the system to obtain a longer focal length while ensuring miniaturization, which helps to improve the ability of the lens to highlight the subject and the ability to photograph distant scenes. More specifically, in this exemplary embodiment, the distance TTL from the object side surface of the first lens of the optical imaging lens to the imaging surface on the optical axis and the effective focal length f of the optical imaging lens satisfy: TTL / f ≤ 1.0.

[0075] In this exemplary embodiment, the distance BFL from the image side surface of the last lens to the imaging surface on the optical axis satisfies: 5.0 mm < BFL < 12.0 mm. By constraining the distance from the image side surface of the last lens to the imaging surface on the optical axis, the lens has a larger telescopic length, and while obtaining a long focal length, it is more suitable for ultra-thin electronic devices. More specifically, the distance BFL from the image side surface of the last lens to the imaging surface on the optical axis satisfies: 5.61 mm ≤ BFL ≤ 7.29 mm.

[0076] In this exemplary embodiment, half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfies: ImgH > 3 mm. By controlling half of the diagonal length of the effective pixel region on the imaging surface, the imaging effect of a large image surface of the system is realized, and thus higher optical performance is obtained. More specifically, half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfies: ImgH ≥ 3.27 mm.

[0077] In this exemplary embodiment, the entrance pupil diameter EPD of the optical imaging lens, half of the diagonal length ImgH of the effective pixel region on the imaging surface, and the effective focal length f of the optical imaging lens satisfy: f / EPD - ImgH / f < 2. By reasonably controlling the ratio of the effective focal length to the entrance pupil diameter and the ratio of half of the diagonal length of the effective pixel region on the imaging surface to the effective focal length, the F-number of the imaging system with a large image surface is relatively small, which can ensure that the system has a large aperture and good imaging quality in a dark environment. More specifically, the entrance pupil diameter EPD of the optical imaging lens, half of the diagonal length ImgH of the effective pixel region on the imaging surface, and the effective focal length f of the optical imaging lens satisfy: 1.56 ≤ f / EPD - ImgH / f ≤ 1.96.

[0078] In this exemplary embodiment, the effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: 0 < f / f1 + f / f2 < 0.5. By satisfying the above conditions, the system optical power is reasonably distributed, avoiding excessive concentration of the optical power of the camera lens group, so that the aberrations of the camera lens group can be better corrected; on the other hand, the sensitivities of the first lens and the second lens are reduced, making the application of the lens more stable. More specifically, the effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: 0.10 ≤ f / f1 + f / f2 ≤ 0.34.

[0079] In this exemplary embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the edge thickness ET1 of the first lens, and the edge thickness ET2 of the second lens satisfy: 1.0 < ET2 / CT2 - ET1 / CT1 < 1.5. By satisfying the above conditions, the lens shape is effectively controlled, which can ensure that the first lens and the second lens have good processability. More specifically, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the edge thickness ET1 of the first lens, and the edge thickness ET2 of the second lens satisfy: 1.04 ≤ ET2 / CT2 - ET1 / CT1 ≤ 1.32.

[0080] In this exemplary embodiment, the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy: 0 < f12 / f34 < 1.0. By constraining the ratio range of the combined focal length of the first lens and the second lens to the combined focal length of the third lens and the fourth lens, the system optical power is reasonably distributed, so that the aberration generated by the first two lenses and the aberration generated by the last two lenses are better balanced, thereby obtaining good imaging quality and achieving the effect of high resolution. More specifically, the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy: 0.27 ≤ f12 / f34 ≤ 0.68.

[0081] In this exemplary embodiment, the central thickness CT1 of the first lens on the optical axis and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 0 < T12×50 / CT1 < 1.0. By constraining the ratio range of the air gap between the first lens and the second lens on the optical axis to the central thickness of the first lens on the optical axis, the field curvature contribution of the first lens is reasonably controlled, so that the system has reasonable field curvature. More specifically, the central thickness CT1 of the first lens on the optical axis and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 0.3 ≤ T12×50 / CT1 ≤ 0.8.

[0082] In this exemplary embodiment, the air gap T23 between the second lens and the third lens on the optical axis and the sum ΣAT of the air gaps between any two adjacent lenses of the first lens to the fourth lens on the optical axis satisfy: 0 < T23 / ΣAT < 1.0. By satisfying the above conditions, the field curvature generated by the front lenses of the system and the field curvature generated by the rear lenses can be balanced, so that the system field curvature is balanced in a reasonable state. More specifically, the air gap T23 between the second lens and the third lens on the optical axis and the sum ΣAT of the air gaps between any two adjacent lenses of the first lens to the fourth lens on the optical axis satisfy: 0.55 ≤ T23 / ΣAT ≤ 0.98.

[0083] In this exemplary embodiment, the edge thickness ET3 of the third lens and the maximum effective radius DT31 of the object side of the third lens satisfy: 0 < ET3 / DT31 < 1.0. By controlling the ratio of the edge thickness of the third lens to the maximum effective radius of the object side of the third lens within a reasonable range, the shape of the third lens is effectively controlled, which is beneficial to injection molding and enables the third lens to have good processability. More specifically, the edge thickness ET3 of the third lens and the maximum effective radius DT31 of the object side of the third lens satisfy: 0.21 ≤ ET3 / DT31 ≤ 0.50.

[0084] In the present exemplary embodiment, the axial distance SAG11 between the intersection point of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, and the axial distance SAG22 between the intersection point of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens satisfy: 0.5 < SAG22 / SAG11 < 1.0. By satisfying the above conditions, the curvature degrees of the first lens and the second lens are effectively controlled, the sensitivities of the first lens and the second lens are reduced, while it is more conducive to processing and forming, the assembly yield is improved, and good imaging quality is ensured. More specifically, the axial distance SAG11 between the intersection point of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, and the axial distance SAG22 between the intersection point of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens satisfy: 0.57 ≤ SAG22 / SAG11 ≤ 0.65.

[0085] In the present exemplary embodiment, 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 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 satisfy: 0 < SAG21 / (SAG21 + SAG41) < 1.0. By satisfying the above conditions, the size layout of the lens is made more reasonable, which is conducive to the assembly of the lens, improves the mass production yield, and enhances the use stability of the lens; at the same time, the aberration contribution amounts of the second lens and the fourth lens are reasonably controlled, so that the system has better imaging quality. More specifically, 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 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 satisfy: 0.47 ≤ SAG21 / (SAG21 + SAG41) ≤ 0.74.

[0086] In the present exemplary embodiment, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the maximum effective radius DT32 of the image side surface of the third lens, and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 0 < CT3 / DT32 + CT4 / DT42 < 1.0. By satisfying the above conditions, the ratio of the central thickness to the outer diameter of the third lens and the fourth lens is reasonably controlled, ensuring the forming and assembly of the lens, so that the system has better imaging quality, lower sensitivity, is easy to injection mold, and has a high yield. More specifically, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the maximum effective radius DT32 of the image side surface of the third lens, and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 0.33 ≤ CT3 / DT32 + CT4 / DT42 ≤ 0.73.

[0087] In this exemplary embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the image side surface of the second lens satisfy: 0 < R1 / (R3 + R4) < 1.0. By reasonably controlling the ratio of the radius of curvature of the object side surface of the first lens to the sum of the radii of curvature of the object side surface and the image side surface of the second lens within a certain range, the axial aberration generated by the imaging optical system can be effectively balanced. More specifically, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the image side surface of the second lens satisfy: 0.55 ≤ R1 / (R3 + R4) ≤ 0.78.

[0088] In this exemplary embodiment, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.3 < R6 / (R5 + R6) < 1.3. By reasonably controlling the curvatures of both sides of the third lens according to the above conditions, the generation of image blurring can be avoided, and at the same time, it is beneficial to avoid the ghost image formed by the reflection of the third lens. More specifically, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.45 ≤ R6 / (R5 + R6) ≤ 1.00.

[0089] In this exemplary embodiment, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 0.3 < R8 / (R7 + R8) < 1.3. By controlling the ratio of the radius of curvature of the image side surface of the fourth lens to the sum of the radii of curvature of the object side surface and the image side surface of the fourth lens within a reasonable range and adjusting the chief ray angle of the optical imaging lens, the relative brightness of the optical imaging lens group can be effectively improved, and the image plane clarity can be enhanced. More specifically, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 0.48 ≤ R8 / (R7 + R8) ≤ 1.02.

[0090] In this exemplary embodiment, for the fourth lens having a focal power, its object side surface is a convex surface. By means of the fourth lens having a focal power, it is helpful for the lens group to balance the vertical chromatic aberration and the lateral chromatic aberration; the object side surface being a convex surface can effectively reduce the aberration of the edge field of view while increasing the light passing amount, which is beneficial to the reasonable distribution of the focal power of the entire lens group and improves the imaging quality.

[0091] In this exemplary embodiment, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0092]

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

[0094] The optical imaging lens according to the above embodiment of the present invention may use multiple lenses, such as the above four lenses. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, the optical imaging lens has a larger imaging surface, a wide imaging range, and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[0095] In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side of the first lens to the image side of the fourth lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side and image side of each lens in the first lens, the second lens, the third lens and the fourth lens is an aspherical mirror surface. Optionally, the object side and image side of each lens in the first lens, the second lens, the third lens and the fourth lens are all aspherical mirror surfaces.

[0096] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although four lenses are used as an example in the embodiments, the optical imaging lens is not limited to including four lenses, and the optical imaging lens may also include other numbers of lenses if necessary.

[0097] Specific embodiments of the optical imaging lens applicable to the above embodiments are further described below with reference to the accompanying drawings. Specific embodiment 1

[0099] Figure 1 Schematic diagram of the lens group structure of the optical imaging lens embodiment 1 of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

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

[0101] As shown in Table 1, it is a basic parameter table of the optical imaging lens of Example 1, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0102]

[0103] Table 1

[0104] As shown in Table 2, in Example 1, the total effective focal length of the optical imaging lens is f=11.34 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 11.33 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=3.27 mm. Half of the maximum field of view of the optical imaging lens is Semi-FOV=15.9°.

[0105]

[0106] Table 2

[0107] The optical imaging lens in Example 1 satisfies:

[0108] TTL / f=1.00; wherein TTL is the distance from the object side of the first lens of the optical imaging lens to the imaging surface on the optical axis, and f is the effective focal length of the optical imaging lens.

[0109] f / EPD-ImgH / f=1.78; wherein f is the effective focal length of the optical imaging lens, EPD is the entrance pupil diameter of the optical imaging lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0110] f / f1+f / f2=0.22; wherein f is the effective focal length of the optical imaging lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0111] ET2 / CT2-ET1 / CT1=1.14; wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, ET1 is the edge thickness of the first lens, and ET2 is the edge thickness of the second lens.

[0112] f12 / f34=0.62; wherein f12 is the combined focal length of the first lens and the second lens, and f34 is the combined focal length of the third lens and the fourth lens.

[0113] T12×50 / CT1=0.46; wherein CT1 is the center thickness of the first lens on the optical axis, and T12 is the air interval between the first lens and the second lens on the optical axis.

[0114] T23 / ΣAT=0.98; wherein T23 is the air spacing between the second lens and the third lens on the optical axis, and ΣAT is the sum of the air spacings between any two adjacent lenses from the first lens to the fourth lens on the optical axis.

[0115] ET3 / DT31=0.30; wherein ET3 is the edge thickness of the third lens, and DT31 is the maximum effective radius of the object side of the third lens.

[0116] SAG22 / SAG11=0.65; wherein, SAG11 is the on-axis distance between the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens, and SAG22 is the on-axis distance between the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens.

[0117] SAG21 / (SAG21+SAG41)=0.55; wherein, SAG21 is the on-axis distance between the intersection of the object side of the second lens and the optical axis to the vertex of the effective radius of the object side of the second lens, and SAG41 is the on-axis distance between the intersection of the object side of the fourth lens and the optical axis to the vertex of the effective radius of the object side of the fourth lens.

[0118] CT3 / DT32+CT4 / DT42=0.48; wherein CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, DT32 is the maximum effective radius of the image side of the third lens, and DT42 is the maximum effective radius of the image side of the fourth lens.

[0119] R1 / (R3+R4)=0.59; wherein R1 is the radius of curvature of the object side of the first lens, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0120] R6 / (R5+R6)=0.54; wherein R5 is the radius of curvature of the object side of the third lens, and R6 is the radius of curvature of the image side of the third lens.

[0121] R8 / (R7+R8)=0.53; wherein R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens.

[0122] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 3 shows the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 1. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 20 A 24 , A 26 , A 28 and A 30 .

[0123] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.0829E-03 -1.0163E-03 1.9997E-03 -2.4502E-03 1.9228E-03 -1.0154E-03 3.7338E-04 S2 6.3516E-04 2.7938E-02 -6.0622E-02 7.5122E-02 -6.0780E-02 3.3971E-02 -1.3527E-02 S3 -1.4778E-02 2.8682E-02 -5.7059E-02 7.1071E-02 -5.8042E-02 3.2574E-02 -1.2910E-02 S4 -3.4386E-02 1.3239E-02 -3.1786E-02 6.1720E-02 -8.3283E-02 7.7728E-02 -5.0986E-02 S5 -4.1029E-02 1.7298E-01 -3.2923E-01 4.7582E-01 -5.2961E-01 4.5057E-01 -2.9271E-01 S6 -1.0950E-01 3.2917E-01 -5.6647E-01 7.5452E-01 -7.7345E-01 5.9617E-01 -3.3995E-01 S7 -6.9036E-02 1.2593E-01 -1.6035E-01 1.4175E-01 -8.1604E-02 1.9183E-02 1.3216E-02 S8 5.6517E-02 -1.7933E-01 3.5127E-01 -5.1082E-01 5.5213E-01 -4.4566E-01 2.6901E-01 Face number A18 A20 A22 A24 A26 A28 A30 S1 -9.7373E-05 1.8091E-05 -2.3721E-06 2.1377E-07 -1.2544E-08 4.2916E-10 -6.4467E-12 S2 3.8960E-03 -8.1387E-04 1.2210E-04 -1.2817E-05 8.9346E-07 -3.7141E-08 6.9663E-10 S3 3.6560E-03 -7.3789E-04 1.0422E-04 -9.8970E-06 5.8375E-07 -1.8050E-08 1.7841E-10 S4 2.3641E-02 -7.6931E-03 1.7160E-03 -2.4955E-04 2.1292E-05 -8.0789E-07 0.0000E+00 S5 1.4514E-01 -5.4633E-02 1.5383E-02 -3.1441E-03 4.4066E-04 -3.7844E-05 1.4988E-06 S6 1.4148E-01 -4.2209E-02 8.7606E-03 -1.1986E-03 9.7032E-05 -3.5176E-06 0.0000E+00 S7 -1.6205E-02 8.5865E-03 -2.8035E-03 5.9448E-04 -8.0029E-05 6.2307E-06 -2.1398E-07 S8 -1.2107E-01 4.0278E-02 -9.7357E-03 1.6579E-03 -1.8817E-04 1.2757E-05 -3.9030E-07

[0124] Table 3

[0125] Figure 2a The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 2b The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 2c The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 2d The magnification chromatic aberration curve of the optical imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 2a to Figure 2d It can be seen from the figure that the optical imaging lens provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0127] Figure 3 Schematic diagram of the lens group structure of the optical imaging lens embodiment 2 of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

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

[0129] As shown in Table 4, it is a basic parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0130]

[0131] Table 4

[0132] As shown in Table 5, in Example 2, the total effective focal length of the optical imaging lens is f=11.34 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 11.34 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=3.27 mm. Half of the maximum field of view of the optical imaging lens is Semi-FOV=15.7°.

[0133]

[0134] Table 5

[0135] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 6 shows the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 2. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 20 A 24 , A 26 , A 28 and A 30 .

[0136] Face number A4 A6 A8 A10 A12 A14 A16 S1 3.0345E-04 4.8732E-04 -9.2446E-04 9.5983E-04 -6.3921E-04 2.8940E-04 -9.1962E-05 S2 -4.9698E-03 3.3262E-02 -4.3905E-02 3.5057E-02 -1.8909E-02 7.1771E-03 -1.9519E-03 S3 -2.6769E-02 3.6349E-02 -3.8938E-02 2.6690E-02 -1.1053E-02 2.0958E-03 3.9201E-04 S4 -4.2749E-02 5.9155E-03 1.7300E-02 -4.1198E-02 4.9374E-02 -3.8310E-02 2.0395E-02 S5 -2.1239E-02 8.2347E-02 -1.2245E-01 1.4745E-01 -1.4514E-01 1.1366E-01 -6.9433E-02 S6 5.4939E-02 2.2626E-02 -5.9747E-02 6.9831E-02 -5.7454E-02 3.6391E-02 -1.8412E-02 S7 -3.7947E-02 7.3712E-02 -1.1906E-01 1.5636E-01 -1.6475E-01 1.3485E-01 -8.3803E-02 S8 8.4870E-03 -3.4248E-02 6.2465E-02 -7.9726E-02 7.0780E-02 -4.4069E-02 1.9051E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 2.0869E-05 -3.3988E-06 3.9419E-07 -3.1771E-08 1.6911E-09 -5.3452E-11 7.5989E-13 S2 3.8180E-04 -5.3212E-05 5.1474E-06 -3.2748E-07 1.2232E-08 -1.9623E-10 -4.1564E-13 S3 -3.9542E-04 1.3182E-04 -2.6135E-05 3.3332E-06 -2.6942E-07 1.2615E-08 -2.6135E-10 S4 -7.5924E-03 1.9736E-03 -3.5082E-04 4.0607E-05 -2.7543E-06 8.2928E-08 0.0000E+00 S5 3.2562E-02 -1.1526E-02 3.0103E-03 -5.6045E-04 7.0183E-05 -5.2872E-06 1.8076E-07 S6 7.4407E-03 -2.3194E-03 5.2667E-04 -8.0692E-05 7.3796E-06 -3.0240E-07 0.0000E+00 S7 3.8917E-02 -1.3314E-02 3.2929E-03 -5.7108E-04 6.5773E-05 -4.5138E-06 1.3962E-07 S8 -5.5048E-03 9.4311E-04 -4.5417E-05 -1.8428E-05 4.5906E-06 -4.5496E-07 1.7706E-08

[0137] Table 6

[0138] Figure 4aThe axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4b The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 4c The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4d The magnification chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 4a to 4d It can be seen from the figure that the optical imaging lens provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0140] Figure 5 Schematic diagram of the lens group structure of Embodiment 3 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

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

[0142] As shown in Table 7, it is a basic parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0143]

[0144]

[0145] Table 7

[0146] As shown in Table 8, in Example 3, the total effective focal length of the optical imaging lens is f=11.34 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 10.79 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=3.27 mm. Half of the maximum field of view of the optical imaging lens is Semi-FOV=15.9°.

[0147]

[0148] Table 8

[0149] In Example 3, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 9 shows the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 3. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 20 A 24 , A 26 , A 28 and A 30 .

[0150]

[0151]

[0152] Table 9

[0153] Figure 6a The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6b The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 6c The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 6d The magnification chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 6a to 6d It can be seen from the figure that the optical imaging lens provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0155] Figure 7 Schematic diagram of the lens group structure of Embodiment 4 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0156] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative power, and its object side surface S5 is concave, and its image side surface S6 is concave. The fourth lens E4 has positive power, and its object side surface S7 is convex, and its image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface of surfaces S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0157] As shown in Table 10, it is a basic parameter table of the optical imaging lens of Example 4, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0158]

[0159]

[0160] Table 10

[0161] As shown in Table 11, in Example 4, the total effective focal length f of the optical imaging lens is 12.22 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 11.77 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=3.27 mm. Half of the maximum field of view angle Semi-FOV of the optical imaging lens is 14.7°.

[0162]

[0163] Table 11

[0164] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 12 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 4. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 20 A 24 , A 26 , A 28 and A 30 .

[0165] Face number A4 A6 A8 A10 A12 A14 A16 S1 6.4041E-04 -1.0313E-03 1.5859E-03 -1.4777E-03 9.1133E-04 -3.9158E-04 1.2042E-04 S2 -1.3203E-03 3.8888E-02 -5.5115E-02 4.4293E-02 -2.3633E-02 8.8528E-03 -2.3796E-03 S3 -2.6184E-02 3.5205E-02 -2.7598E-02 2.6357E-03 1.4202E-02 -1.4485E-02 7.8710E-03 S4 -4.1557E-02 2.7909E-03 3.4067E-02 -7.0381E-02 7.7216E-02 -5.5327E-02 2.7556E-02 S5 -3.4832E-02 1.1786E-01 -1.7788E-01 2.0874E-01 -1.9445E-01 1.4211E-01 -8.0565E-02 S6 -1.3944E-01 3.9564E-01 -6.3468E-01 7.2833E-01 -6.0753E-01 3.6787E-01 -1.5998E-01 S7 -1.2521E-01 3.1809E-01 -5.0222E-01 5.5334E-01 -4.3348E-01 2.3858E-01 -8.7730E-02 S8 2.5146E-02 -1.0276E-01 2.6716E-01 -4.9683E-01 6.6267E-01 -6.4218E-01 4.5667E-01 Face number A18 A20 A22 A24 A26 A28 A30 S1 -2.6836E-05 4.3377E-06 -5.0300E-07 4.0745E-08 -2.1875E-09 6.9899E-11 -1.0058E-12 S2 4.5931E-04 -6.2403E-05 5.6606E-06 -2.9895E-07 4.7279E-09 3.4142E-10 -1.4683E-11 S3 -2.8122E-03 6.9972E-04 -1.2272E-04 1.4932E-05 -1.2024E-06 5.7686E-08 -1.2490E-09 S4 -9.7526E-03 2.4517E-03 -4.2828E-04 4.9358E-05 -3.3613E-06 1.0180E-07 0.0000E+00 S5 3.5020E-02 -1.1499E-02 2.7914E-03 -4.8415E-04 5.6619E-05 -3.9923E-06 1.2799E-07 S6 4.8715E-02 -9.8274E-03 1.1428E-03 -3.8562E-05 -6.4339E-06 5.9364E-07 0.0000E+00 S7 1.7930E-02 3.0264E-04 -1.4396E-03 4.6166E-04 -7.5882E-05 6.6959E-06 -2.5162E-07 S8 -2.3931E-01 9.2099E-02 -2.5675E-02 5.0390E-03 -6.5961E-04 5.1654E-05 -1.8292E-06

[0166] Table 12

[0167] Figure 8a The axial chromatic aberration curve of the optical imaging lens of Example 4 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 8b The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 8c The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 8d The magnification chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 8a to 8d It can be seen from the figure that the optical imaging lens provided in Example 4 can achieve good imaging quality. Specific embodiment 5

[0169] Fig. 9 Schematic diagram of the lens group structure of the optical imaging lens embodiment 5 of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0170] The first lens E1 has positive power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is concave, and the image side surface S6 is convex. The fourth lens E4 has negative power, its object side surface S7 is convex, and the image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface of surfaces S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0171] As shown in Table 13, it is a basic parameter table of the optical imaging lens of Example 5, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0172]

[0173] Table 13

[0174] As shown in Table 14, in Example 5, the total effective focal length f of the optical imaging lens is 12.22 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 11.73 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=3.27 mm. Half of the maximum field of view angle Semi-FOV of the optical imaging lens is 14.7°.

[0175]

[0176]

[0177] Table 14

[0178] In Example 5, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 15 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 5. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 20 A 24 , A 26 , A 28 and A 30 .

[0179] Face number A4 A6 A8 A10 A12 A14 A16 S1 8.2976E-04 -6.3205E-04 9.0280E-04 -8.4087E-04 5.4586E-04 -2.5654E-04 8.9040E-05 S2 -4.3351E-02 1.2037E-01 -1.5680E-01 1.3333E-01 -7.9935E-02 3.5012E-02 -1.1413E-02 S3 -5.6855E-02 1.0028E-01 -1.0910E-01 7.5397E-02 -3.3459E-02 8.7947E-03 -7.7465E-04 S4 -4.0798E-02 -7.3138E-03 6.0565E-02 -1.1173E-01 1.2027E-01 -8.6569E-02 4.3380E-02 S5 -1.9366E-02 6.3288E-02 -7.8866E-02 8.6326E-02 -8.3955E-02 6.6521E-02 -4.0846E-02 S6 -7.1491E-02 2.1477E-01 -3.1292E-01 3.4550E-01 -2.9863E-01 2.0063E-01 -1.0353E-01 S7 -5.1427E-02 5.1348E-02 3.0221E-02 -1.6075E-01 2.4365E-01 -2.2558E-01 1.4387E-01 S8 3.7100E-02 -1.3252E-01 2.8109E-01 -4.1412E-01 4.3689E-01 -3.3712E-01 1.9241E-01 Face number A18 A20 A22 A24 A26 A28 A30 S1 -2.2854E-05 4.2921E-06 -5.7840E-07 5.4179E-08 -3.3375E-09 1.2123E-10 -1.9630E-12 S2 2.7885E-03 -5.0883E-04 6.8326E-05 -6.5512E-06 4.2421E-07 -1.6613E-08 2.9694E-10 S3 -3.4149E-04 1.5797E-04 -3.3360E-05 4.2578E-06 -3.3576E-07 1.5129E-08 -2.9905E-10 S4 -1.5324E-02 3.8004E-03 -6.4734E-04 7.2061E-05 -4.7151E-06 1.3728E-07 0.0000E+00 S5 1.8986E-02 -6.5741E-03 1.6641E-03 -2.9877E-04 3.6036E-05 -2.6192E-06 8.6708E-08 S6 4.0377E-02 -1.1619E-02 2.3789E-03 -3.2658E-04 2.6878E-05 -1.0006E-06 0.0000E+00 S7 -6.5797E-02 2.1837E-02 -5.2279E-03 8.8092E-04 -9.9168E-05 6.6953E-06 -2.0499E-07 S8 -8.1589E-02 2.5619E-02 -5.8775E-03 9.5758E-04 -1.0495E-04 6.9372E-06 -2.0896E-07

[0180] Table 15

[0181] Fig.10a The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig.10b The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.10c The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.10d The magnification chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 10a to 10d It can be seen from the figure that the optical imaging lens provided in Example 5 can achieve good imaging quality. Specific embodiment 6

[0183] Fig.11 Schematic diagram of the lens group structure of Embodiment 6 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0184] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is convex, and its image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface of surfaces S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0185] As shown in Table 16, it is a basic parameter table of the optical imaging lens of Example 6, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0186]

[0187] Table 16

[0188] As shown in Table 17, in Example 6, the total effective focal length f of the optical imaging lens is 11.50 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 11.22 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=3.27 mm. Half of the maximum field of view angle Semi-FOV of the optical imaging lens is 15.5°.

[0189]

[0190] Table 17

[0191] In Example 6, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 18 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 6. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 20 A 24 , A 26 , A 28 and A 30 .

[0192] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.2072E-03 -1.8446E-03 3.3738E-03 -3.6462E-03 2.5930E-03 -1.2718E-03 4.4214E-04 S2 2.2387E-03 1.8229E-02 -2.6286E-02 2.2942E-02 -1.3952E-02 6.1610E-03 -2.0084E-03 S3 -1.5645E-02 2.1193E-02 -2.9504E-02 2.8319E-02 -2.0123E-02 1.0867E-02 -4.4544E-03 S4 -2.7820E-02 7.8216E-03 -6.2061E-03 3.2540E-03 -8.2096E-04 8.0171E-05 2.1223E-06 S5 2.5519E-02 9.1422E-03 -1.9596E-02 1.4559E-02 -1.9058E-03 -7.9538E-03 9.7383E-03 S6 8.3372E-02 -3.7897E-02 3.5300E-02 -4.9763E-02 6.0683E-02 -5.2840E-02 3.2240E-02 S7 3.4875E-02 -3.6574E-02 1.9819E-02 2.3678E-03 -2.2720E-02 3.0007E-02 -2.3430E-02 S8 9.0004E-03 -1.5053E-02 8.3177E-03 3.2987E-04 -6.7440E-03 7.0090E-03 -3.5100E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.1050E-04 1.9906E-05 -2.5606E-06 2.2925E-07 -1.3563E-08 4.7624E-10 -7.5113E-12 S2 4.8574E-04 -8.6817E-05 1.1304E-05 -1.0412E-06 6.4243E-08 -2.3799E-09 3.9993E-11 S3 1.3755E-03 -3.1649E-04 5.3265E-05 -6.3518E-06 5.0726E-07 -2.4295E-08 5.2690E-10 S4 -6.6256E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 -6.2306E-03 2.5263E-03 -6.6876E-04 1.1233E-04 -1.0886E-05 4.6403E-07 0.0000E+00 S6 -1.3670E-02 3.9353E-03 -7.3241E-04 7.9405E-05 -3.8059E-06 0.0000E+00 0.0000E+00 S7 1.2414E-02 -4.6418E-03 1.2320E-03 -2.2793E-04 2.8024E-05 -2.0620E-06 6.8811E-08 S8 6.9984E-04 1.8843E-04 -1.6796E-04 5.1695E-05 -8.6472E-06 7.8123E-07 -2.9985E-08

[0193] Table 18

[0194] Fig.12aThe axial chromatic aberration curve of the optical imaging lens of Example 6 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 12b The astigmatism curve of the optical imaging lens of Example 6 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.12c The distortion curve of the optical imaging lens of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.12d The magnification chromatic aberration curve of the optical imaging lens of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 12a to 12d It can be seen from the figure that the optical imaging lens provided in Example 6 can achieve good imaging quality. Specific embodiment 7

[0196] Fig.13 2 is a schematic diagram of the structure of a lens group of Embodiment 7 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0197] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is convex, and its image side surface S8 is convex. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface of surfaces S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0198] As shown in Table 19, it is a basic parameter table of the optical imaging lens of Example 7, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0199]

[0200]

[0201] Table 19

[0202] As shown in Table 20, in Example 7, the total effective focal length f of the optical imaging lens is 12.04 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 11.54 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=3.27 mm. Half of the maximum field of view angle Semi-FOV of the optical imaging lens is 14.9°.

[0203]

[0204] Table 20

[0205] In Example 7, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 21 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 7. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 20 A 24 , A 26 , A 28 and A 30 .

[0206]

[0207]

[0208] Table 21

[0209] Fig.14a The axial chromatic aberration curve of the optical imaging lens of Example 7 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig.14b The astigmatism curve of the optical imaging lens of Example 7 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.14c The distortion curve of the optical imaging lens of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.14d The magnification chromatic aberration curve of the optical imaging lens of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 14a to 14d It can be seen from the figure that the optical imaging lens provided in Example 7 can achieve good imaging quality.

[0210] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, It is characterized in that The optical imaging lens has four lenses with optical power, and the four lenses include, in order from the object side to the image side along the optical axis: A first lens having positive optical power, whose object side surface is convex; The second lens has a negative optical power, and its object side surface is convex and its image side surface is concave; a third lens element having optical power and having a concave object-side surface; and a fourth lens having optical power and having a convex object-side surface; At least one of the third lens and the fourth lens has positive refractive power; Wherein, the distance TTL from the object side of the first lens of the optical imaging lens to the imaging plane on the optical axis and the effective focal length f of the optical imaging lens satisfy: 0.95≤TTL / f≤1.00; The distance BFL from the image side of the last lens to the imaging surface on the optical axis satisfies: 5.61mm≤BFL≤7.29mm; The center thickness CT1 of the first lens on the optical axis and the air interval T12 between the first lens and the second lens on the optical axis satisfy: 0.30≤T12×50 / CT1≤0.80; The curvature radius R1 of the object side surface of the first lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: 0.55≤R1 / (R3+R4)≤0.

78.

2. The optical imaging lens according to claim 1, It is characterized in that The effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 0.10≤f / f1+f / f2≤0.

34.

3. The optical imaging lens according to claim 1, It is characterized in that The center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the edge thickness ET1 of the first lens and the edge thickness ET2 of the second lens satisfy: 1.0 <ET2 / CT2-ET1 / CT1≤1.32。 4. The optical imaging lens according to claim 1, It is characterized in that The combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy: 0.27≤f12 / f34≤0.

68.

5. The optical imaging lens according to claim 1, It is characterized in that An air interval T23 between the second lens and the third lens on the optical axis and a sum ΣAT of air intervals between any two adjacent lenses from the first lens to the fourth lens on the optical axis satisfy: 0.55≤T23 / ΣAT<1.

0.

6. The optical imaging lens according to claim 1, It is characterized in that The edge thickness ET3 of the third lens and the maximum effective radius DT31 of the object side of the third lens satisfy: 0.21≤ET3 / DT31≤0.

50.

7. The optical imaging lens according to claim 1, It is characterized in that The on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens and the on-axis distance SAG22 between the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens satisfy: 0.57≤SAG22 / SAG11≤0.

65.

8. The optical imaging lens according to claim 1, It is characterized in that The on-axis distance SAG21 between the intersection of the second lens object side and the optical axis to the effective radius vertex of the second lens object side and the on-axis distance SAG41 between the intersection of the fourth lens object side and the optical axis to the effective radius vertex of the fourth lens object side satisfy: 0.47≤SAG21 / (SAG21+SAG41)≤0.

74.

9. The optical imaging lens according to claim 1, It is characterized in that The center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the maximum effective radius DT32 of the image side of the third lens and the maximum effective radius DT42 of the image side of the fourth lens satisfy: 0.33≤CT3 / DT32+CT4 / DT42≤0.

73.

10. The optical imaging lens according to claim 1, It is characterized in that A curvature radius R5 of the object side surface of the third lens and a curvature radius R6 of the image side surface of the third lens satisfy: 0.45≤R6 / (R5+R6)≤1.

00.

11. The optical imaging lens according to claim 1, It is characterized in that A curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens satisfy: 0.48≤R8 / (R7+R8)≤1.

02.

12. The optical imaging lens according to claim 1, It is characterized in that Half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: ImgH=3.

27.

13. The optical imaging lens according to claim 1, It is characterized in that An entrance pupil diameter EPD of the optical imaging lens, half of the diagonal length of an effective pixel area on an imaging surface ImgH, and an effective focal length f of the optical imaging lens satisfy: 1.56≤f / EPD-ImgH / f≤1.96.

Images