An optical imaging lens

Abstract

The present invention discloses an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens having positive optical power; a second lens having negative optical power, and its object side surface is concave; a third lens may have negative optical power; a fourth lens may have positive optical power or negative optical power; a fifth lens may have positive optical power or negative optical power, and its object side surface is convex; wherein the center thickness CT1 of the first lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy: 4.5<CT1 / CT2<5.5. The optical imaging lens provided by the present invention has the characteristics of a small head, a large image plane, and a high resolution. While improving the screen-to-body ratio and module stability, it also meets the requirements of a high image plane resolution and clear imaging, making the full screen more beautiful and helping to improve user experience.

Description

Technical Field

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

[0002] With the update and iteration of portable smart terminals, in order to meet the portrait shooting needs of customers, smartphones are also developing towards high screen-to-body ratio, high light transmittance, and ultra-thinness. Optical imaging lenses, as important functional modules and selling points of mobile phones, are also developing towards smaller heads, smaller total lengths, high resolutions, large apertures, and high stability. The smaller lens head size makes the opening of the mobile phone screen smaller, which is more conducive to improving the screen-to-body ratio of the mobile phone. At the same time, the smaller head size is conducive to improving the stability of the mobile phone module.

[0003] Therefore, the present invention proposes an optical imaging lens, which has the characteristics of a small head, a large image surface, and a high resolution. While improving the screen-to-body ratio and module stability, it also meets the requirements of higher image surface resolution and clear imaging, making the full screen more beautiful and helping to improve user experience. Summary of the invention

[0004] The present invention aims to propose an optical imaging lens which has the characteristics of a small head, a large image plane, and a high resolution. While improving the screen-to-body ratio and module stability, it also meets the requirements of a higher image plane resolution and clear imaging.

[0005] The present invention provides an optical imaging lens, which comprises, in order from the object side to the image side along the optical axis: an aperture; a first lens with optical power; a second lens with negative optical power, whose object side surface is a concave surface; a third lens with negative optical power; a fourth lens with optical power; and a fifth lens with optical power, whose object side surface is a convex surface; wherein a center thickness CT1 of the first lens on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy: 4.5<CT1 / CT2<5.5.

[0006] According to one embodiment of the present invention, the effective focal length f of the optical imaging lens and the combined focal length f12 of the first lens and the second lens satisfy the following: 0.8<f12 / f<1.6.

[0007] According to one embodiment of the present invention, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD≤2.6.

[0008] According to one embodiment of the present invention, the combined focal length f45 of the fourth lens and the fifth lens and the curvature radius R8 of the image-side surface of the fourth lens satisfy: 1.0<|f45 / R8|<7.5.

[0009] According to one embodiment of the present invention, the effective focal length f of the optical imaging lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: 0.9<f123 / f<2.0.

[0010] According to one embodiment of the present invention, a curvature radius R6 of the image-side surface of the third lens and a curvature radius R9 of the object-side surface of the fifth lens satisfy: 1.0<|R9 / R6|<5.8.

[0011] According to one embodiment of the present invention, the effective focal length f1 of the first lens and the curvature radius R1 of the object side surface of the first lens satisfy: 1.5<f1 / R1<2.5.

[0012] According to one embodiment of the present invention, an air interval T23 between the second lens and the third lens on the optical axis and an air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.0<T45 / T23<3.6.

[0013] According to one embodiment of the present invention, the on-axis distance TTL from the object side of the first lens to the imaging plane and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following: TTL / ImgH<1.4.

[0014] According to one embodiment of the present invention, the maximum effective radius DT51 of the object-side surface of the fifth lens and the maximum effective radius DT52 of the image-side surface of the fifth lens satisfy: 1.0<DT52 / DT51<1.5.

[0015] According to one embodiment of the present invention, a refractive index N3 of the third lens element and a refractive index N5 of the fifth lens element satisfy: 1.0<N3 / N5<1.5.

[0016] According to one embodiment of the present invention, the second lens and the third lens are made of the same material, and have a refractive index greater than 1.6.

[0017] According to one embodiment of the present invention, half of the maximum field of view Semi-FOV of the optical imaging lens satisfies: 35°<Semi-FOV<45°.

[0018] According to one embodiment of the present invention, half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: ImgH>3.0mm.

[0019] Beneficial effects of the present invention:

[0020] The optical imaging lens provided by the present invention includes multiple lenses, such as the first lens to the fifth lens. Reasonably controlling the ratio of the air gap between the first lens and the second lens on the optical axis to the air gap between the third lens and the fourth lens on the optical axis, and reasonably adjusting the air gap between the lenses can better balance the distortion of the system, reduce the ghost image energy, and ensure that the system obtains better imaging quality. The optical imaging lens of the present invention has the characteristics of a small head, a large image surface, and a high resolution. While improving the screen-to-body ratio and module stability, it also meets the requirements of higher image resolution and clear imaging, making the full screen more beautiful and helping to improve user experience. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 1 Schematic diagram of the structure of a lens assembly of an optical imaging lens embodiment 1 of the present invention;

[0023] Figure 2 is an axial chromatic aberration curve of the optical imaging lens embodiment 1 of the present invention;

[0024] Figure 3 is the astigmatism curve of the optical imaging lens embodiment 1 of the present invention;

[0025] Figure 4 Schematic diagram of the lens group structure of Embodiment 2 of the optical imaging lens of the present invention;

[0026] Figure 5 axial chromatic aberration curve of the optical imaging lens embodiment 2 of the present invention;

[0027] Figure 6 is the astigmatism curve of the optical imaging lens embodiment 2 of the present invention;

[0028] Figure 7 Schematic diagram of the lens group structure of Embodiment 3 of the optical imaging lens of the present invention;

[0029] Figure 8 axial chromatic aberration curve of the optical imaging lens embodiment 3 of the present invention;

[0030] Fig. 9 is the astigmatism curve of the optical imaging lens embodiment 3 of the present invention;

[0031] Fig.10 Schematic diagram of the lens group structure of Embodiment 4 of the optical imaging lens of the present invention;

[0032] Fig.11 axial chromatic aberration curve of the optical imaging lens embodiment 4 of the present invention;

[0033] Fig.12 is the astigmatism curve of the optical imaging lens embodiment 4 of the present invention;

[0034] Fig.13 Schematic diagram of the lens group structure of Embodiment 5 of the optical imaging lens of the present invention;

[0035] Fig.14 axial chromatic aberration curve of the optical imaging lens embodiment 5 of the present invention;

[0036] Fig.15 : is the astigmatism curve of the optical imaging lens embodiment 5 of the present invention. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal way unless explicitly defined in this article.

[0043] It should be noted that, in the absence of conflict, the embodiments of 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 drawings and in combination with the embodiments.

[0044] Exemplary Embodiments

[0045] The optical imaging lens of an exemplary embodiment of the present invention includes five lenses, which include: an aperture, a first lens, a second lens, a third lens, a fourth lens and a fifth lens in order from the object side to the image side along the optical axis, wherein each lens is independent of each other and has an air gap between each lens on the optical axis.

[0046] In this exemplary embodiment, the first lens has positive optical power; the second lens has negative optical power, and its object side surface is concave; the third lens may have negative optical power; the fourth lens may have positive optical power or negative optical power; the fifth lens may have positive optical power or negative optical power, and its object side surface is convex.

[0047] In this exemplary embodiment, the center thickness CT1 of the first lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy: 4.5<CT1 / CT2<5.5. Reasonable control of the ratio range of the center thickness of the first lens and the center thickness of the third lens can achieve an orderly combination of the thicknesses of the two lenses. This combination is conducive to reducing lens distortion, positive and negative astigmatism, and has a good complementary buffering effect for the performance under different temperature environments, showing good temperature drift performance; it can also reduce the size of the optical imaging lens, avoid the optical imaging lens from being too large, and improve the space utilization of the optical imaging system. More specifically, the center thickness CT1 of the first lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy: 4.54<CT1 / CT2<5.35.

[0048] In this exemplary embodiment, the effective focal length f of the optical imaging lens and the combined focal length f12 of the first lens and the second lens satisfy: 0.8<f12 / f<1.6. Reasonable configuration of the combined focal length of the first lens and the second lens can, on the one hand, effectively reduce the sensitivity of the first lens and the second lens and avoid overly strict tolerance requirements. On the other hand, it can also balance the spherical aberration, chromatic aberration and astigmatism generated by the first lens and the second lens, thereby improving the resolution of the system and making the imaging effect of the system better. More specifically, the effective focal length f of the optical imaging lens and the combined focal length f12 of the first lens and the second lens satisfy: 0.9<f12 / f<1.55.

[0049] In this exemplary embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD≤2.6. Controlling the ratio of the effective focal length of the optical imaging lens to the entrance pupil diameter can ensure that the optical imaging lens can meet the requirement of a smaller head while ensuring that sufficient light flux reaches the image plane, so that the system still has good imaging quality in a weak light environment.

[0050] In this exemplary embodiment, the combined focal length f45 of the fourth lens and the fifth lens and the radius of curvature R8 of the image side of the fourth lens satisfy: 1.0<|f45 / R8|<7.5. Reasonable control of the ratio of the combined focal length of the fourth lens and the fifth lens and the radius of curvature of the object side of the fourth lens can effectively reduce the degree of deflection of light in the fourth lens, reduce the sensitivity of the lens, facilitate the convergence of light, and avoid total reflection of the lens surface and the generation of ghost images. More specifically, the combined focal length f45 of the fourth lens and the fifth lens and the radius of curvature R8 of the image side of the fourth lens satisfy: 1.15<|f45 / R8|<7.45.

[0051] In this exemplary embodiment, the effective focal length f of the optical imaging lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: 0.9<f123 / f<2.0. Reasonable allocation of the combined focal lengths of the first lens, the second lens and the third lens can better reduce the sensitivity of the three lenses, avoid overly strict tolerance requirements, and balance the distortion and astigmatism of the entire system. In addition, a larger image plane can be obtained by controlling the ratio to match a larger imaging image plane, so as to have higher imaging quality. More specifically, the effective focal length f of the optical imaging lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: 0.95<f123 / f<1.95.

[0052] In this exemplary embodiment, the radius of curvature R6 of the image side of the third lens and the radius of curvature R9 of the object side of the fifth lens satisfy: 1.0<|R9 / R6|<5.8. Reasonable control of the ratio of the radius of curvature of the image side of the third lens and the object side of the fifth lens can avoid the difficulty of processing due to excessive mirror inclination, and at the same time reduce the process sensitivity of the fifth lens. Cooperating with the third lens of the optical imaging lens can ensure better convergence of external light, effectively balance the spherical aberration and field curvature of the optical imaging lens, and allow the lens to have better imaging quality. More specifically, the radius of curvature R6 of the image side of the third lens and the radius of curvature R9 of the object side of the fifth lens satisfy: 1.30<|R9 / R6|<5.55.

[0053] In this exemplary embodiment, the effective focal length f1 of the first lens and the radius of curvature R1 of the object side of the first lens satisfy: 1.5<f1 / R1<2.5. Reasonable allocation of the ratio of the focal length of the first lens and the radius of curvature of the object side of the first lens can effectively reduce the degree of deflection of light in the first lens, reduce the sensitivity of the lens, and enable the system to have a higher aberration correction ability while maintaining a small head, and can obtain better processability. More specifically, the effective focal length f1 of the first lens and the radius of curvature R1 of the object side of the first lens satisfy: 1.85<f1 / R1<2.4.

[0054] In this exemplary embodiment, the air interval T23 between the second lens and the third lens on the optical axis and the air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.0<T45 / T23<3.6. Reasonable control of the ratio of the air interval between the second lens and the third lens on the optical axis to the air interval between the fourth lens and the fifth lens on the optical axis is conducive to slowing down the deflection of light, adjusting the field curvature of the lens, reducing the sensitivity, balancing the distortion of the system, reducing the ghost image energy between the fourth lens and the fifth lens, and ensuring that the system has good imaging quality. More specifically, the air interval T23 between the second lens and the third lens on the optical axis and the air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.30<T45 / T23<3.8.

[0055] In this exemplary embodiment, the on-axis distance TTL from the object side of the first lens to the imaging surface and half the diagonal length of the effective pixel area on the imaging surface ImgH satisfy: TTL / ImgH<1.4. Reasonable control of the on-axis distance from the object side of the first lens to the imaging surface and the half image height makes the optical imaging lens have a smaller size and saves space. More specifically, the on-axis distance TTL from the object side of the first lens to the imaging surface and half the diagonal length of the effective pixel area on the imaging surface ImgH satisfy: TTL / ImgH<1.38.

[0056] In this exemplary embodiment, the maximum effective radius DT51 of the object side of the fifth lens and the maximum effective radius DT52 of the image side of the fifth lens satisfy: 1.0<DT52 / DT51<1.5. Reasonable control of the aperture ratio of the fifth lens can, on the one hand, effectively control the vignetting value of the system and intercept the part of light with poor imaging quality, thereby improving the resolution of the entire system; on the other hand, it is beneficial to control the step difference of each lens of the system, facilitate molding and assembly, and ensure the stability of assembly. More specifically, the maximum effective radius DT51 of the object side of the fifth lens and the maximum effective radius DT52 of the image side of the fifth lens satisfy: 1.10<DT52 / DT51<1.35.

[0057] In this exemplary embodiment, the refractive index N3 of the third lens and the refractive index N5 of the fifth lens satisfy: 1.0<N3 / N5<1.5. Reasonable control of the refractive index ratio of the third lens and the fifth lens can help reduce the magnification chromatic aberration of the system's off-axis field of view and offset part of the spherical aberration in the system. More specifically, the refractive index N3 of the third lens and the refractive index N5 of the fifth lens satisfy: 1.0<N3 / N5<1.10.

[0058] In this exemplary embodiment, the second lens and the third lens are made of the same material, and the refractive index is greater than 1.6. Reasonable control of the refractive index of the second lens and the third lens can effectively balance the spherical aberration and chromatic aberration generated by the two lenses, ensure processability, obtain better refractive power, and improve imaging quality. More specifically, the refractive index of the second lens and the third lens is greater than 1.65.

[0059] In this exemplary embodiment, the Semi-FOV, half of the maximum field of view angle of the optical imaging lens, satisfies: 35°<Semi-FOV<45°. Controlling half of the maximum field of view angle of the optical imaging system to be greater than 35° and less than 45° is not only conducive to obtaining object surface information within a larger angle range during actual shooting, but also can quickly find the imaging position of the photographed object during shooting, giving consumers a better user experience. More specifically, the Semi-FOV, half of the maximum field of view angle of the optical imaging lens, satisfies: 37.5°<Semi-FOV<42.5°.

[0060] In this exemplary embodiment, half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: ImgH>3.0mm. Setting ImgH to be greater than 3.0mm ensures that the system has a sufficiently large image plane to present more detailed information of the photographed scene. More specifically, half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: ImgH>3.30mm.

[0061] In this exemplary embodiment, the optical imaging lens may further include a stop. The stop may be disposed at an appropriate position as required, for example, the stop may be disposed between the object side and the first lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0062] The optical imaging lens according to the above embodiment of the present invention may use multiple lenses, such as the above five 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.

[0063] 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 fifth 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, the fourth lens and the fifth 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, the fourth lens and the fifth lens are all aspherical mirror surfaces.

[0064] In Examples 1-5, the object side surface and the image side surface of any lens of the first lens E1 to the fifth lens E5 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0065]

[0066] 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.

[0067] 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 five lenses are described as an example in the embodiments, the optical imaging lens is not limited to including five lenses, and the optical imaging lens may also include other numbers of lenses if necessary.

[0068] 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

[0070] 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: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0071] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface of surfaces S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0072] 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).

[0073]

[0074] Table 1

[0075] As shown in Table 2, in Example 1, the total effective focal length of the optical imaging lens is f=3.62 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens is 4.55 mm, and half of the diagonal length of the effective pixel area on the imaging surface S13 is ImgH=3.38 mm. Half of the maximum field of view of the optical imaging lens is Semi-FOV=42.2°. The maximum effective radius DT51 of the object side surface of the fifth lens is 2.28 mm.

[0076]

[0077]

[0078] Table 2

[0079] The optical imaging lens in Example 1 satisfies:

[0080] CT1 / CT2=4.78, wherein CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0081] f12 / f=1.52, where f is the effective focal length of the optical imaging lens, and f12 is the combined focal length of the first lens and the second lens.

[0082] f / EPD=2.55, where f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

[0083] |f45 / R8|=7.43, wherein f45 is the combined focal length of the fourth lens and the fifth lens, and R8 is the radius of curvature of the image side of the fourth lens.

[0084] f123 / f=1.52, where f is the effective focal length of the optical imaging lens, and f123 is the combined focal length of the first lens, the second lens, and the third lens.

[0085] |R9 / R6|=2.44, wherein R6 is the radius of curvature of the image side surface of the third lens, and R9 is the radius of curvature of the object side surface of the fifth lens.

[0086] f1 / R1=2.01, wherein f1 is the effective focal length of the first lens, and R1 is the radius of curvature of the object side of the first lens.

[0087] T45 / T23=2.27, wherein T23 is the air space between the second lens and the third lens on the optical axis, and T45 is the air space between the fourth lens and the fifth lens on the optical axis.

[0088] TTL / ImgH=1.35, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0089] DT52 / DT51=1.12, wherein DT51 is the maximum effective radius of the object side of the fifth lens, and DT52 is the maximum effective radius of the image side of the fifth lens.

[0090] N3 / N5=1.08, where N3 is the refractive index of the third lens, and N5 is the refractive index of the fifth lens.

[0091] The second lens is made of the same material as the third lens and has a refractive index of 1.68°.

[0092] Semi-FOV=42.2°, where Semi-FOV is half of the maximum field of view of the optical imaging system.

[0093] ImgH=3.38 mm, where ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0094] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 3 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A5 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0095]

[0096]

[0097] Table 3

[0098] Figure 2 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 3 The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figures 2 to 3 It can be seen from the figure that the optical imaging lens provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0100] Figure 4 Schematic diagram of the lens group structure of embodiment 2 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: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0101] The first lens E1 has positive focal power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative focal power, its object side surface S3 is concave, and the image side surface S4 is concave. The third lens E3 has negative focal power, its object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive focal power, its object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has positive focal power, its object side surface S9 is convex, and the image side surface S10 is convex. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface of surfaces S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0102] 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).

[0103]

[0104]

[0105] Table 4

[0106] As shown in Table 5, in Example 2, the total effective focal length of the optical imaging lens is f=3.09 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens is 4.55 mm, and half of the diagonal length of the effective pixel area on the imaging surface S13 is ImgH=3.38 mm. Half of the maximum field of view of the optical imaging lens is Semi-FOV=41.2°. The maximum effective radius DT51 of the object side surface of the fifth lens is 2.10 mm.

[0107]

[0108] Table 5

[0109] The optical imaging lens in Example 2 satisfies:

[0110] CT1 / CT2=4.78, wherein CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0111] f12 / f=1.43, where f is the effective focal length of the optical imaging lens, and f12 is the combined focal length of the first lens and the second lens.

[0112] f / EPD=2.55, where f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

[0113] |f45 / R8|=1.20, wherein f45 is the combined focal length of the fourth lens and the fifth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0114] f123 / f=1.53, where f is the effective focal length of the optical imaging lens, and f123 is the combined focal length of the first lens, the second lens, and the third lens.

[0115] |R9 / R6|=2.85, wherein R6 is the radius of curvature of the image side surface of the third lens, and R9 is the radius of curvature of the object side surface of the fifth lens.

[0116] f1 / R1=2.04, wherein f1 is the effective focal length of the first lens, and R1 is the radius of curvature of the object side of the first lens.

[0117] T45 / T23=1.34, wherein T23 is the air distance between the second lens and the third lens on the optical axis, and T45 is the air distance between the fourth lens and the fifth lens on the optical axis.

[0118] TTL / ImgH=1.35, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0119] DT52 / DT51=1.17, wherein DT51 is the maximum effective radius of the object side of the fifth lens, and DT52 is the maximum effective radius of the image side of the fifth lens.

[0120] N3 / N5=1.08, where N3 is the refractive index of the third lens, and N5 is the refractive index of the fifth lens.

[0121] The second lens is made of the same material as the third lens and has a refractive index of 1.68°.

[0122] Semi-FOV=41.2°, where Semi-FOV is half of the maximum field of view of the optical imaging system.

[0123] ImgH=3.38 mm, where ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0124] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0125] Face number A4 A6 A8 A10 A12 A14 A16 S1 5.2197E-04 -3.7723E-04 -2.7621E-04 -2.2269E-04 -1.7791E-04 -1.1877E-04 -7.1824E-05 S2 -8.7612E-02 -5.0682E-03 1.9847E-03 -1.0008E-04 -5.5779E-04 -2.6311E-04 -1.0777E-04 S3 -1.3734E-01 9.7305E-03 7.0881E-03 -1.3643E-03 -2.8140E-03 -1.4545E-04 6.3410E-04 S4 -6.2497E-02 2.6293E-02 -1.4692E-03 1.2607E-03 1.9616E-04 -5.8037E-04 2.9088E-04 S5 -1.8531E-01 2.4606E-02 -3.3809E-03 -4.6915E-03 1.6800E-03 -7.8426E-04 2.1841E-05 S6 -2.7362E-01 3.7030E-02 -1.0469E-02 -1.6605E-04 -1.1022E-04 5.9928E-04 -4.7868E-04 S7 -2.6028E-01 4.9499E-02 -8.2717E-02 4.0384E-02 -1.4835E-02 1.1512E-02 -6.0079E-03 S8 -1.7032E-01 2.9282E-01 -1.8962E-01 7.5780E-02 -2.2879E-02 7.7949E-03 -6.2149E-03 S9 -1.2437E+00 4.7879E-01 -1.8289E-01 -3.3377E-02 3.9521E-02 -4.5645E-02 1.6852E-02 S10 1.1167E-01 -4.2055E-01 2.8353E-01 -1.5676E-01 1.2284E-01 -8.8274E-02 5.8634E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.0699E-05 -8.1318E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -1.4858E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 2.6812E-04 1.3764E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.6745E-04 1.2008E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 6.2127E-05 -2.9174E-05 -5.1155E-06 1.2651E-05 8.2457E-07 0.0000E+00 0.0000E+00 S6 5.4355E-04 -1.5557E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 3.2299E-03 -1.9043E-03 8.1158E-04 8.2805E-04 6.4774E-04 4.8049E-04 4.9938E-05 S8 5.2237E-03 -1.7305E-03 -7.4235E-04 2.5774E-04 5.6144E-04 -3.9160E-04 7.2834E-05 S9 -2.1394E-02 7.4588E-03 -2.8627E-03 -7.9348E-04 0.0000E+00 0.0000E+00 0.0000E+00 S10 -3.3590E-02 2.1961E-02 -1.2299E-02 7.3703E-03 -4.4923E-03 1.5121E-03 -1.8766E-03

[0126] Table 6

[0127] Figure 5 The 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 6 The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figures 5 and 6 It can be seen from the figure that the optical imaging lens provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0129] Figure 7 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: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0130] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface of surfaces S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0131] 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).

[0132]

[0133] Table 7

[0134] As shown in Table 8, in Example 3, the total effective focal length of the optical imaging lens is f=3.55 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens is 4.62 mm, and half of the diagonal length of the effective pixel area on the imaging surface S13 is ImgH=3.37 mm. Half of the maximum field of view of the optical imaging lens is Semi-FOV=38.1°. The maximum effective radius DT51 of the object side surface of the fifth lens is 1.98 mm.

[0135]

[0136]

[0137] Table 8

[0138] The optical imaging lens in Example 3 satisfies:

[0139] CT1 / CT2=5.31, wherein CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0140] f12 / f=0.91, where f is the effective focal length of the optical imaging lens, and f12 is the combined focal length of the first lens and the second lens.

[0141] f / EPD=2.60, where f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

[0142] |f45 / R8|=1.18, wherein f45 is the combined focal length of the fourth lens and the fifth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0143] f123 / f=0.99, where f is the effective focal length of the optical imaging lens, and f123 is the combined focal length of the first lens, the second lens, and the third lens.

[0144] |R9 / R6|=1.31, wherein R6 is the radius of curvature of the image side surface of the third lens, and R9 is the radius of curvature of the object side surface of the fifth lens.

[0145] f1 / R1=2.00, wherein f1 is the effective focal length of the first lens, and R1 is the radius of curvature of the object side of the first lens.

[0146] T45 / T23=1.31, wherein T23 is the air distance between the second lens and the third lens on the optical axis, and T45 is the air distance between the fourth lens and the fifth lens on the optical axis.

[0147] TTL / ImgH=1.37, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0148] DT52 / DT51=1.34, wherein DT51 is the maximum effective radius of the object side of the fifth lens, and DT52 is the maximum effective radius of the image side of the fifth lens.

[0149] N3 / N5=1.08, where N3 is the refractive index of the third lens, and N5 is the refractive index of the fifth lens.

[0150] The second lens is made of the same material as the third lens and has a refractive index of 1.68°.

[0151] Semi-FOV=41.2°, where Semi-FOV is half of the maximum field of view of the optical imaging system.

[0152] ImgH=3.37 mm, where ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0153] In Example 3, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 9 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A5 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0154]

[0155]

[0156] Table 9

[0157] Figure 8 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. Fig. 9 The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figures 8 to 9 It can be seen from the figure that the optical imaging lens provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0159] Fig.10 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: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0160] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface of surfaces S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0161] 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).

[0162]

[0163]

[0164] Table 10

[0165] As shown in Table 11, in Example 4, the total effective focal length of the optical imaging lens is f=3.65 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens is 4.59 mm, and half of the diagonal length of the effective pixel area on the imaging surface S13 is ImgH=3.38 mm. Half of the maximum field of view of the optical imaging lens is Semi-FOV=37.8°. The maximum effective radius DT51 of the object side surface of the fifth lens is 2.16 mm.

[0166]

[0167] Table 11

[0168] The optical imaging lens in Example 4 satisfies:

[0169] CT1 / CT2=4.68, wherein CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0170] f12 / f=1.17, where f is the effective focal length of the optical imaging lens, and f12 is the combined focal length of the first lens and the second lens.

[0171] f / EPD=2.55, where f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

[0172] |f45 / R8|=4.59, wherein f45 is the combined focal length of the fourth lens and the fifth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0173] f123 / f=1.62, where f is the effective focal length of the optical imaging lens, and f123 is the combined focal length of the first lens, the second lens, and the third lens.

[0174] |R9 / R6|=1.78, wherein R6 is the curvature radius of the image side surface of the third lens, and R9 is the curvature radius of the object side surface of the fifth lens.

[0175] f1 / R1=1.86, wherein f1 is the effective focal length of the first lens, and R1 is the radius of curvature of the object side of the first lens.

[0176] T45 / T23=2.79, wherein T23 is the air distance between the second lens and the third lens on the optical axis, and T45 is the air distance between the fourth lens and the fifth lens on the optical axis.

[0177] TTL / ImgH=1.36, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0178] DT52 / DT51=1.26, wherein DT51 is the maximum effective radius of the object side of the fifth lens, and DT52 is the maximum effective radius of the image side of the fifth lens.

[0179] N3 / N5=1.08, where N3 is the refractive index of the third lens, and N5 is the refractive index of the fifth lens.

[0180] The second lens is made of the same material as the third lens and has a refractive index of 1.68°.

[0181] Semi-FOV=37.8°, where Semi-FOV is half of the maximum field of view of the optical imaging system.

[0182] ImgH=3.38 mm, where ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0183] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 12 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A24 , A 26 , A 28 and A 30 .

[0184] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.8042E-03 -5.0156E-04 -3.8293E-04 -2.8782E-04 -2.1872E-04 -1.3589E-04 -7.6580E-05 S2 -5.9775E-02 5.6208E-03 5.0001E-04 -2.1860E-04 -1.8206E-04 7.7207E-06 3.0137E-05 S3 -4.6404E-02 1.9345E-02 -4.3292E-03 -2.4486E-03 -7.2365E-04 1.9926E-05 -1.5174E-04 S4 4.8208E-02 1.4336E-02 -3.6172E-03 -3.3399E-03 -3.0991E-03 -1.5587E-03 -6.7652E-04 S5 -1.8756E-01 -1.2077E-02 -2.0294E-03 4.2028E-03 2.6226E-03 1.2481E-03 3.4496E-04 S6 -3.4009E-01 2.4192E-02 -1.7068E-02 6.7532E-03 -4.9317E-04 2.0250E-03 -1.0785E-03 S7 -1.9473E-01 4.7606E-02 -4.0468E-02 8.5157E-03 -4.0364E-03 3.8090E-03 -1.2569E-03 S8 4.5207E-01 1.1712E-02 -1.8504E-02 -5.9025E-03 1.6042E-03 2.4416E-03 -1.5421E-03 S9 -1.4434E+00 4.9070E-01 -1.1620E-01 -3.0843E-02 1.3710E-02 2.7083E-03 5.7266E-04 S10 -2.2716E+00 3.7695E-01 -4.7875E-02 1.6786E-02 2.0878E-04 -1.0285E-02 9.0683E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.1702E-05 -1.0405E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 1.3263E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -1.4853E-04 -5.3918E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -2.1738E-04 -4.8847E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 9.9353E-05 1.3288E-05 -3.2535E-06 1.7182E-05 -6.8363E-06 0.0000E+00 0.0000E+00 S6 4.3815E-04 -1.4045E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 3.0080E-03 -2.6208E-04 8.8023E-04 2.1600E-04 2.3778E-04 2.3086E-05 2.6717E-05 S8 2.3685E-04 -5.2904E-05 -4.4988E-05 -1.0396E-04 8.5479E-05 -7.4336E-05 -4.8605E-05 S9 -3.6176E-03 5.5659E-03 -2.3270E-04 1.1571E-03 0.0000E+00 0.0000E+00 0.0000E+00 S10 -7.2766E-03 5.1229E-03 -3.3423E-03 2.6263E-03 -1.3762E-03 4.6145E-04 -9.7979E-05

[0185] Table 12

[0186] Fig.11 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. Fig.12 The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 11 to Figure 12 It can be seen from the figure that the optical imaging lens provided in Example 4 can achieve good imaging quality. Specific embodiment 5

[0188] Fig.13 Schematic diagram of the lens group structure of embodiment 5 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: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0189] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface of surfaces S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0190] 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).

[0191]

[0192] Table 13

[0193] As shown in Table 14, in Example 5, the total effective focal length of the optical imaging lens is f=3.33 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens is 4.45 mm, and half of the diagonal length of the effective pixel area on the imaging surface S13 is ImgH=3.38 mm. Half of the maximum field of view of the optical imaging lens is Semi-FOV=41.1°. The maximum effective radius DT51 of the object side surface of the fifth lens is 2.40 mm.

[0194]

[0195]

[0196] Table 14

[0197] The optical imaging lens in Example 5 satisfies:

[0198] CT1 / CT2=4.55, wherein CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0199] f12 / f=1.33, where f is the effective focal length of the optical imaging lens, and f12 is the combined focal length of the first lens and the second lens.

[0200] f / EPD=2.45, where f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

[0201] |f45 / R8|=4.31, wherein f45 is the combined focal length of the fourth lens and the fifth lens, and R8 is the radius of curvature of the image side of the fourth lens.

[0202] f123 / f=1.93, where f is the effective focal length of the optical imaging lens, and f123 is the combined focal length of the first lens, the second lens, and the third lens.

[0203] |R9 / R6|=5.52, wherein R6 is the radius of curvature of the image side surface of the third lens, and R9 is the radius of curvature of the object side surface of the fifth lens.

[0204] f1 / R1=2.04, wherein f1 is the effective focal length of the first lens, and R1 is the radius of curvature of the object side of the first lens.

[0205] T45 / T23=3.56, wherein T23 is the air distance between the second lens and the third lens on the optical axis, and T45 is the air distance between the fourth lens and the fifth lens on the optical axis.

[0206] TTL / ImgH=1.32, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0207] DT52 / DT51=1.23, wherein DT51 is the maximum effective radius of the object side of the fifth lens, and DT52 is the maximum effective radius of the image side of the fifth lens.

[0208] N3 / N5=1.08, where N3 is the refractive index of the third lens, and N5 is the refractive index of the fifth lens.

[0209] The second lens is made of the same material as the third lens and has a refractive index of 1.68°.

[0210] Semi-FOV=41.1°, where Semi-FOV is half of the maximum field of view of the optical imaging system.

[0211] ImgH=3.38 mm, where ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0212] In Example 5, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 15 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0213]

[0214]

[0215] Table 15

[0216] Fig.14 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.15 The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14 to Figure 15 It can be seen from the figure that the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0217] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: The optical imaging lens has five lenses with optical power, and the optical imaging lens includes, in order from the object side to the image side along the optical axis: Aperture; The first lens has positive refractive power, and its object side surface is convex and its image side surface is concave; a second lens having negative optical power and a concave object-side surface; a third lens having negative optical power; a fourth lens having optical power; a fifth lens having optical power and having a convex object-side surface; Wherein, the center thickness CT1 of the first lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy: 4.5<CT1 / CT2≤4.78; The curvature radius R6 of the image side surface of the third lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 1.78≤|R9 / R6|≤5.52; A ratio of an air interval t12 between the first lens and the second lens on the optical axis to an air interval t34 between the third lens and the fourth lens on the optical axis satisfies: 0.1537 / 0.1517≤t12 / t34≤0.2113 / 0.1547.

2. The optical imaging lens according to claim 1, wherein: The effective focal length f of the optical imaging lens and the combined focal length f12 of the first lens and the second lens satisfy: 0.91≤f12 / f≤1.

52.

3. The optical imaging lens according to claim 1, wherein: The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: 2.45≤f / EPD≤2.

6.

4. The optical imaging lens according to claim 1, wherein: The combined focal length f45 of the fourth lens and the fifth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 1.18≤|f45 / R8|≤7.

43.

5. The optical imaging lens according to claim 1, wherein: The effective focal length f of the optical imaging lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: 0.99≤f123 / f≤1.

93.

6. The optical imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens and the curvature radius R1 of the object side surface of the first lens satisfy: 1.86≤f1 / R1≤2.

04.

7. The optical imaging lens according to claim 1, wherein: An air interval T23 between the second lens and the third lens on the optical axis and an air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy the following: 1.31≤T45 / T23<3.

6.

8. The optical imaging lens according to claim 1, wherein: The axial distance TTL from the object side of the first lens to the imaging plane and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following: 1.32≤TTL / ImgH<1.

4.

9. The optical imaging lens according to claim 1, wherein: The maximum effective radius DT51 of the object side surface of the fifth lens and the maximum effective radius DT52 of the image side surface of the fifth lens satisfy: 1.12≤DT52 / DT51≤1.

34.

10. The optical imaging lens according to claim 1, wherein: A refractive index N3 of the third lens and a refractive index N5 of the fifth lens satisfy: N3 / N5=1.

08.

11. The optical imaging lens according to claim 1, wherein: The second lens is made of the same material as the third lens, and has a refractive index greater than 1.

6.

12. The optical imaging lens according to claim 1, wherein: Half of the maximum field of view Semi-FOV of the optical imaging lens satisfies: 37.8°≤Semi-FOV≤42.2°.

13. The optical imaging lens according to claim 1, wherein: Half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: 3.37mm≤ImgH≤3.38mm.

Images