Imaging lens and mobile device

Abstract

The application discloses an imaging lens and a mobile device. The imaging lens comprises a lens barrel, a first lens group and a second lens group. The first lens group and the second lens group are movably installed on the lens barrel along the optical axis. When the imaging lens works, the first lens group and the second lens group move towards the object side. When the imaging lens focuses on different object distances, the second lens group moves towards or away from the first lens group according to the working requirement, and the distance between the first lens group and the imaging surface is constant, so that the distance between the first lens group and the second lens group is adjusted, and clear focusing under different object distances is ensured. When the imaging lens is in a non-working state, the first lens group and the second lens group move towards the image side, so that the length and volume of the imaging lens are reduced, and the imaging lens can meet the use of the mobile device as much as possible.

Description

Technical Field

[0001] This invention relates to the field of optical lens design technology, specifically to an imaging lens and a mobile device. Background Technology

[0002] Existing mobile devices, including mobile phones, tablets, and laptops, are generally equipped with imaging lenses. Among them, the imaging lenses in mobile phones are generally periscope telephoto lenses. While mobile phones are constantly developing towards miniaturization and lightness, periscope telephoto lenses are large and heavy, which limits the size of mobile phones and makes it difficult to meet the needs of current mobile phone design. Summary of the Invention

[0003] The main objective of this invention is to propose an imaging lens and a mobile device that addresses the problem that traditional imaging lenses are too long and have too large an overall size, thus failing to meet the design requirements of mobile devices.

[0004] To achieve the above objectives, the present invention provides an imaging lens having an object side and an image side arranged opposite to each other along the optical axis, the imaging lens comprising:

[0005] Lens tube;

[0006] A first lens group, movably mounted on the lens barrel along the optical axis, comprises a first lens with positive optical power, a second lens with positive optical power, and a third lens with negative optical power, arranged sequentially from the object side to the image side; and...

[0007] The second lens group is movably disposed between the first lens group and the image side along the optical axis. The second lens group includes a fourth lens with negative optical power and a fifth lens with positive optical power arranged sequentially from the object side to the image side. The second lens group has a movement stroke that moves closer to and away from the first lens group to adjust the distance between the third lens and the fourth lens to meet the focusing requirements of different object distances.

[0008] The imaging lens satisfies the following conditions: 0.25≤|f1 / f2|≤0.35, and 0.56≤|f1 / f3|≤1.2, and 0.36≤|f1 / f4|≤1.1, and 0.24≤|f1 / f5|≤0.84, and 0.31≤|d15 / TTL|≤0.51;

[0009] Wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, d15 is the distance on the optical axis from the object side of the first lens to the image side of the fifth lens, and TTL is the total optical length of the imaging lens.

[0010] Optionally, the refractive index of the first lens is Nd1, and the Abbe number is Vd1, wherein 1.5 ≤ Nd1 ≤ 1.6, and 50 ≤ Vd1 ≤ 60; and / or,

[0011] The second lens has a refractive index of Nd² and an Abbe number of Vd², wherein 1.5 ≤ Nd² ≤ 1.6 and 50 ≤ Vd² ≤ 60; and / or,

[0012] The third lens has a refractive index of Nd³ and an Abbe number of Vd³, wherein 1.6 ≤ Nd³ ≤ 1.7 and 20 ≤ Vd³ ≤ 35; and / or,

[0013] The fourth lens has a refractive index of Nd⁴ and an Abbe number of Vd⁴, wherein 1.6 ≤ Nd⁴ ≤ 1.7 and 20 ≤ Vd⁴ ≤ 35; and / or,

[0014] The fifth lens has a refractive index of Nd5 and an Abbe number of Vd5, wherein 1.6 ≤ Nd5 ≤ 1.7 and 20 ≤ Vd5 ≤ 35.

[0015] Optionally, the imaging lens further includes an imaging element disposed between the fifth lens and the image side. The imaging element includes an imaging surface facing the fifth lens, and the imaging element is used to receive light signals incident from the outside through the imaging surface.

[0016] Optionally, the imaging lens satisfies the following condition: 0.3 ≤ |HI / TTL| ≤ 0.7;

[0017] Wherein, HI is the maximum image plane diameter of the imaging plane.

[0018] Optionally, the imaging lens further includes a filter located between the fifth lens and the imaging element.

[0019] Optionally, the first lens is a biconvex lens, the second lens is a biconvex lens, the third lens is a biconcave lens, the fourth lens is a concave-convex lens, and the fifth lens is a convex-concave lens.

[0020] Optionally, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all aspherical lenses; and / or,

[0021] The first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all made of plastic.

[0022] Optionally, the first lens group is a positive power lens group and the second lens group is a negative power lens group, so that the total optical length of the imaging lens is less than the focal length of the imaging lens.

[0023] Optionally, the imaging lens further includes an aperture stop located between the first lens and the second lens.

[0024] The present invention also proposes a mobile device, the mobile device including an imaging lens, the imaging lens having an object side and an image side disposed opposite to each other along the optical axis, the imaging lens comprising:

[0025] Lens tube;

[0026] A first lens group, movably mounted on the lens barrel along the optical axis, comprises a first lens with positive optical power, a second lens with positive optical power, and a third lens with negative optical power, arranged sequentially from the object side to the image side; and...

[0027] The second lens group is movably disposed between the first lens group and the image side along the optical axis. The second lens group includes a fourth lens with negative optical power and a fifth lens with positive optical power arranged sequentially from the object side to the image side. The second lens group has a movement stroke that moves closer to and away from the first lens group to adjust the distance between the third lens and the fourth lens to meet the focusing requirements of different object distances.

[0028] The imaging lens satisfies the following conditions: 0.25≤|f1 / f2|≤0.35, and 0.56≤|f1 / f3|≤1.2, and 0.36≤|f1 / f4|≤1.1, and 0.24≤|f1 / f5|≤0.84, and 0.31≤|d15 / TTL|≤0.51;

[0029] Wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, d15 is the distance on the optical axis from the object side of the first lens to the image side of the fifth lens, and TTL is the total optical length of the imaging lens.

[0030] In the technical solution of this invention, by movably mounting the first lens group and the second lens group along the optical axis, when the imaging lens is working, the first lens group and the second lens group move toward the object side to the working position. When the imaging lens needs to zoom, the second lens group moves toward and away from the first lens group according to the working requirements, thereby adjusting the distance between the third lens and the fourth lens, thus adjusting the focal length of the imaging lens. When the imaging lens stops working, the first lens group and the second lens group move together toward the image side, thereby shortening the length and volume of the imaging lens. Specifically, when the imaging lens is in working condition, the mechanical length ranges from 17.0 to 19.5 mm; when the imaging lens is retracted, the optical length ranges from 6.0 to 6.75 mm, and the mechanical length ranges from 7.0 to 8.0 mm, thus enabling the imaging lens to meet the needs of mobile devices as much as possible. This solution uses a second lens group for object distance focusing, which reduces the weight of the driver, increases driving stability, ensures focusing accuracy, and reduces the outer diameter of the driver components due to the smaller aperture of the second lens group, effectively compressing the overall size of the product. In addition, the lens has a 5-element structure, which can effectively improve the imaging performance of the product. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the structure of an embodiment of the imaging lens provided by the present invention;

[0033] Figure 2 A schematic diagram of the non-working state of an embodiment of the imaging lens provided by the present invention;

[0034] Figure 3 for Figure 1 A schematic diagram of the MTF curve of a medium imaging lens;

[0035] Figure 4 for Figure 1 A schematic diagram of the optical aberration curves of a medium imaging lens.

[0036] Explanation of icon numbers:

[0037] label name label name 1 First lens 6 camera element 2 Second lens 7 Aperture 3 Third lens 8 Filter 4 Fourth lens 5 Fifth lens

[0038] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0041] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0042] Existing mobile devices, including mobile phones, tablets, and laptops, are generally equipped with imaging lenses. Among them, the imaging lenses in mobile phones are generally periscope telephoto lenses. While mobile phones are constantly developing towards miniaturization and lightness, periscope telephoto lenses are large and heavy, which limits the size of mobile phones and makes it difficult to meet the needs of current mobile phone design.

[0043] In view of this, the present invention provides a mobile device, the mobile device including an imaging lens, and any mobile device including the imaging lens belongs to the mobile device described in the present invention. Figures 1 to 4 This is an embodiment of the imaging lens provided by the present invention.

[0044] Please see Figures 1 to 4The imaging lens has an object side and an image side arranged opposite each other along the optical axis. The imaging lens includes a lens barrel, a first lens group, and a second lens group. The first lens group is movably mounted on the lens barrel along the optical axis. The first lens group includes a first lens 1 with positive optical power, a second lens 2 with positive optical power, and a third lens 3 with negative optical power, arranged sequentially from the object side to the image side. The second lens group is movably disposed between the first lens group and the image side along the optical axis. The second lens group includes a fourth lens 4 with negative optical power and a fifth lens 5 with positive optical power, arranged sequentially from the object side to the image side. The second lens group has a movement range that moves closer to and away from the first lens group to adjust the distance between the third lens 3 and the fourth lens 4, satisfying focusing requirements for different object distances. The imaging lens satisfies the following conditions: 0.25≤|f1 / f2|≤0.35, and 0.56≤|f1 / f3|≤1.2, and 0.36≤|f1 / f4|≤1.1, and 0.24≤|f1 / f5|≤0.84, and 0.31≤|d15 / TTL|≤0.51; where f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, f4 is the focal length of the fourth lens 4, f5 is the focal length of the fifth lens 5, d15 is the distance from the object side of the first lens 1 to the image side of the fifth lens 5 on the optical axis, and TTL is the total optical length of the imaging lens.

[0045] In the technical solution of this invention, by movably mounting the first lens group and the second lens group along the optical axis, when the imaging lens is working, the first lens group and the second lens group move toward the object side to the working position. When the imaging lens needs to zoom, the second lens group moves toward and away from the first lens group according to the working requirements, thereby adjusting the distance between the third lens 3 and the fourth lens 4, thus adjusting the focal length of the imaging lens. When the imaging lens stops working, the first lens group and the second lens group move together toward the image side, thereby shortening the length and volume of the imaging lens. Specifically, when the imaging lens is in working condition, the mechanical length ranges from 17.0 to 19.5 mm; when the imaging lens is retracted, the optical length ranges from 6.0 to 6.75 mm, and the mechanical length ranges from 7.0 to 8.0 mm, thus enabling the imaging lens to meet the needs of mobile devices as much as possible. This solution uses two groups of second lenses for object distance focusing, which reduces the weight of the driver, increases driving stability, and ensures focusing accuracy. Furthermore, since the aperture of the second group of lenses is small, the outer diameter of the driver structure can be reduced accordingly, effectively compressing the overall size of the product. In addition, the lens has a 5-element structure, which can effectively improve the imaging performance of the product.

[0046] In this invention, the object side refers to the direction in which the imaging lens captures the object, and the image side refers to the direction in which the imaging surface of the imaging lens is located.

[0047] It should be noted that optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam; it characterizes the ability of an optical system to deflect light rays. The larger the absolute value of the optical power, the stronger its ability to bend light rays; the smaller the absolute value, the weaker its ability to bend light rays. When the optical power is positive, the refraction of light rays is converging; when the optical power is negative, the refraction of light rays is diverging.

[0048] Furthermore, the refractive index of the first lens 1 is Nd1, and the Abbe number is Vd1, wherein 1.5 ≤ Nd1 ≤ 1.6, and 50 ≤ Vd1 ≤ 60. The first lens 1 is a positive power lens, and the refractive index of the first lens 1 is greater than or equal to 1.5 and less than or equal to 1.6, and the Abbe number of the first lens 1 is greater than or equal to 50 and less than or equal to 60, which can effectively converge light and control the dispersion of each wavelength.

[0049] The refractive index of the second lens 2 is Nd2, and the Abbe number is Vd2, wherein 1.5≤Nd2≤1.6 and 50≤Vd2≤60; the second lens 2 is a positive power lens, and the refractive index of the second lens 2 is greater than or equal to 1.5 and less than or equal to 1.6, and the Abbe number of the second lens 2 is greater than or equal to 50 and less than or equal to 60, thereby further converging the light.

[0050] The refractive index of the third lens 3 is Nd3, and the Abbe number is Vd3, wherein 1.6≤Nd3≤1.7 and 20≤Vd3≤35; the third lens 3 is a negative power lens, and the refractive index of the third lens 3 is greater than or equal to 1.6 and less than or equal to 1.7, and the Abbe number of the third lens 3 is greater than or equal to 20 and less than or equal to 35, which can effectively improve chromatic aberration.

[0051] The fourth lens 4 has a refractive index of Nd4 and an Abbe number of Vd4, wherein 1.6 ≤ Nd4 ≤ 1.7 and 20 ≤ Vd4 ≤ 35; the fourth lens 4 is a negative power lens, and the refractive index of the fourth lens 4 is greater than or equal to 1.6 and less than or equal to 1.7, and the Abbe number of the fourth lens 4 is greater than or equal to 20 and less than or equal to 35, thereby effectively improving chromatic aberration.

[0052] The fifth lens 5 has a refractive index of Nd5 and an Abbe number of Vd5, wherein 1.6 ≤ Nd5 ≤ 1.7 and 20 ≤ Vd5 ≤ 35. The fifth lens 5 is a positive power lens, and its refractive index is greater than or equal to 1.6 and less than or equal to 1.7, and its Abbe number is greater than or equal to 20 and less than or equal to 35, effectively improving chromatic aberration and further converging light.

[0053] Of course, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 can all adopt the above-described embodiments simultaneously, which makes the imaging capability of the imaging lens more excellent and can improve chromatic aberration to a greater extent.

[0054] Furthermore, the imaging lens also includes an image sensor 6, which is disposed between the fifth lens 5 and the image side. The image sensor 6 has an imaging surface facing the fifth lens 5, and the image sensor 6 is used to receive light signals incident from the outside through the imaging surface.

[0055] In this embodiment, the light from the object captured by the imaging lens enters the imaging lens from the object side, and then passes through the first lens group and the second lens group in sequence before entering the imaging surface, thereby enabling the imaging element 6 to obtain a light signal for subsequent image processing.

[0056] Furthermore, the imaging lens satisfies the following condition: 0.3≤|HI / TTL|≤0.7; where HI is the maximum image plane diameter of the imaging surface, and TTL is the total optical length of the imaging lens.

[0057] In this embodiment, there are several limitations in the design of the imaging lens. For example, the maximum image plane diameter limits the total optical length of the imaging lens. If the maximum image plane diameter is too long, the imaging lens needs a longer total optical length to achieve such a large image plane, which undoubtedly increases the overall length of the imaging lens and is inconvenient to use. In this embodiment, the ratio of the maximum image plane diameter to the total optical length of the imaging lens can be less than or equal to 0.7. Therefore, even with a larger maximum image plane diameter, the total optical length of the imaging lens generally will not be excessively long, making it more suitable for use in mobile devices.

[0058] Specifically, the imaging lens further includes a filter 7, which is located between the fifth lens 5 and the imaging element 6. It should be noted that the filter 7 can be an infrared filter 7, thereby enabling the imaging lens to filter out infrared light, preventing infrared light from reaching the imaging element 6 and interfering with normal visible light imaging, thus improving image quality.

[0059] Specifically, the first lens 1 is a biconvex lens, the second lens 2 is a biconvex lens, the third lens 3 is a biconcave lens, the fourth lens 4 is a concave-convex lens, and the fifth lens 5 is a convex-concave lens.

[0060] Specifically, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are all aspherical lenses.

[0061] It should be noted that the curvature of an aspherical lens changes continuously from the center to the periphery, unlike the constant curvature of a spherical lens. Aspherical lenses have better curvature radius characteristics, which can improve distortion aberrations and astigmatism. By using aspherical lenses, aberrations that occur during imaging can be eliminated as much as possible, thereby improving the imaging quality of the imaging lens.

[0062] Specifically, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are all made of plastic.

[0063] In this embodiment, the plastic lens can reduce the weight of the imaging lens, thereby reducing the burden on the driving mechanism in the imaging lens, which is beneficial to reducing the size of the driving mechanism, and thus further reducing the size of the imaging lens.

[0064] Specifically, the first lens group is a positive power lens group, and the second lens group is a negative power lens group, so that the total optical length of the imaging lens is less than the focal length of the imaging lens. This effectively shortens the thickness of the first and second lens groups, ensuring that the entire imaging lens can be retracted to a mechanical length of 7.0-8.0 mm when not in use, thus meeting the length requirements of mobile devices for the imaging lens.

[0065] Specifically, the imaging lens further includes an aperture stop 7, which is located between the first lens 1 and the second lens 2. In this embodiment, the aperture stop 7 is used to limit the light beam to further improve the imaging quality of the imaging lens.

[0066] Specifically, the parameters of the imaging lens are shown in Tables 1 to 3 below.

[0067]

[0068]

[0069] Table 1 shows the parameters of each lens when the imaging lens is focused at infinity.

[0070]

[0071]

[0072] Table 2 shows the parameters of each lens when the imaging lens is focused at 3M.

[0073] Wherein, S1 represents the object-side surface of the first lens 1, S2 represents the image-side surface of the first lens 1, S3 represents the object-side surface of the second lens 2, S4 represents the image-side surface of the second lens 2, S5 represents the object-side surface of the third lens 3, S6 represents the image-side surface of the third lens 3, S7 represents the object-side surface of the fourth lens 4, S8 represents the image-side surface of the fourth lens 4, S9 represents the object-side surface of the fifth lens 5, S10 represents the image-side surface of the fifth lens 5, S11 represents the object-side surface of the filter 7, S12 represents the image-side surface of the filter 7, R represents the radius of curvature of the optical element, D represents the thickness or air gap of the optical element, Nd represents the d-ray refractive index of the optical material used, and Vd represents the d-ray Abbe number of the optical material used.

[0074] Focal length f F-number Half field of view ω Fixed focus 18.96 2.487 15°

[0075] Table 3 lists the focal length, F-number, and half-field-of-view parameters for fixed-focus imaging lenses.

[0076] Where f represents the focal length of the imaging lens, F-number is the F-number of the imaging lens, and ω is the half field of view of the imaging lens.

[0077] Specifically, the surface shape Z of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0078]

[0079] Where Z is the distance vector from the vertex of the aspherical surface along the optical axis at a height of h, c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature in the table above), and K is the conic coefficient, A4, A6, A8, A 10 A 12 A 14 A 16 The coefficients for the higher-order terms are shown in Tables 3 and 4 below.

[0080] In this embodiment, the coefficients of even-order terms for each aspherical surface are shown in Table 4 below.

[0081] Face number S1 S2 S4 S5 S6 <![CDATA[A4]]> 0.000803191 0.002370929 0.005908448 0.004294456 0.007238395 <![CDATA[A6]]> -2.18E-05 0.000215656 1.66E-04 -2.12E-04 -6.05E-05 <![CDATA[A8]]> -1.21E-05 -1.76E-05 -1.14E-05 -6.23E-07 -1.43E-05 <![CDATA[A 10 ]]> 2.05E-06 1.89E-06 9.56E-07 2.39E-08 -1.12E-06 <![CDATA[A 12 ]]> -7.86E-08 -1.31E-08 -1.06E-07 -1.89E-09 2.62E-07 <![CDATA[A 14 ]]> 0 -1.33E-08 3.12E-09 2.29E-09 -1.04E-08 <![CDATA[A 16 ]]> 0 5.05E-10 -1.17E-10 -1.80E-10 -3.24E-11 Face number S7 S9 S10 S11 S12 <![CDATA[A4]]> 0.005596663 0.005121045 0.006035851 -0.00837593 -0.00446215 <![CDATA[A6]]> 0.000605984 3.36E-04 0.000462971 -5.62E-06 -0.000715603 <![CDATA[A8]]> 1.26E-05 -1.18E-04 -0.000174076 -6.01E-05 3.24E-05 <![CDATA[A 10 ]]> -1.71E-05 4.14E-06 3.20E-05 4.16E-06 -3.02E-06 <![CDATA[A 12 ]]> 1.09E-06 5.31E-06 4.53E-08 1.53E-06 1.98E-06 <![CDATA[A 14 ]]> 2.11E-07 -8.75E-07 -1.82E-07 -1.42E-07 -2.92E-07 <![CDATA[A 16 ]]> -1.90E-08 3.99E-08 2.48E-09 -4.94E-09 9.98E-09

[0082] Table 4 lists the even-order term coefficients of the aspherical lenses used in imaging.

[0083] In this context, E-01 represents 10 to the power of -1, E-02 represents 10 to the power of -2, and so on, with EN representing 10 to the power of -N.

[0084] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An imaging lens, characterized in that, An imaging lens has an object side and an image side arranged oppositely along an optical axis direction, the imaging lens comprising: a lens barrel; a first lens group movably mounted on the lens barrel along the optical axis direction, the first lens group comprising, from the object side to the image side, a first lens having positive refractive power, a second lens having positive refractive power, and a third lens having negative refractive power; and a second lens group movably arranged between the first lens group and the image side along the optical axis direction, the second lens group comprising, from the object side to the image side, a fourth lens having negative refractive power and a fifth lens having positive refractive power, and the second lens group having a movement stroke close to and away from the first lens group to adjust the distance between the third lens and the fourth lens to meet the focusing requirements of different object distances; wherein the imaging lens satisfies the following conditions: 0.25≤ |f1 / f2| ≤0.35, and 0.56≤ |f1 / f3| ≤1.2, and 0.36≤ |f1 / f4| ≤1.1, and 0.24≤ |f1 / f5| ≤0.84, and 0.31≤ |d15 / TTL| ≤0.51; wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, d15 is the distance on the optical axis from the object side surface of the first lens to the image side surface of the fifth lens, and TTL is the total optical length of the imaging lens; the refractive index of the first lens is Nd1 and the Abbe number is Vd1, wherein 1.5≤Nd1≤1.6 and 50≤Vd1≤60; the refractive index of the second lens is Nd2 and the Abbe number is Vd2, wherein 1.5≤Nd2≤1.6 and 50≤Vd2≤60; the refractive index of the third lens is Nd3 and the Abbe number is Vd3, wherein 1.6≤Nd3≤1.7 and 20≤Vd3≤35; the refractive index of the fourth lens is Nd4 and the Abbe number is Vd4, wherein 1.6≤Nd4≤1.7 and 20≤Vd4≤35; the refractive index of the fifth lens is Nd5 and the Abbe number is Vd5, wherein 1.6≤Nd5≤1.7 and 20≤Vd5≤35; the imaging lens further comprises an image sensor, the image sensor being arranged between the fifth lens and the image side, the image sensor comprising an imaging surface facing the fifth lens, and the image sensor being configured to receive an external light signal through the imaging surface.

2. The imaging lens of claim 1, wherein, the imaging lens satisfies the following condition: 0.3≤ |HI / TTL| ≤0.7; wherein HI is the maximum image surface diameter of the imaging surface.

3. The imaging lens of claim 1, wherein, The imaging lens further comprises a filter located between the fifth lens and the image sensor.

4. The imaging lens of claim 1, wherein, The first lens is a biconvex lens, the second lens is a biconvex lens, the third lens is a biconcave lens, the fourth lens is a meniscus lens, and the fifth lens is a meniscus lens.

5. The imaging lens of claim 3, wherein, The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspherical lenses; and / or, The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all made of plastic material.

6. The imaging lens of claim 1, wherein, The first lens group is a positive focal length lens group, and the second lens group is a negative focal length lens group, so that the total optical length of the imaging lens is less than the focal length of the imaging lens.

7. The imaging lens of claim 1, wherein, The imaging lens further comprises a diaphragm, which is located between the first lens and the second lens.

8. A mobile device, comprising: The mobile device comprises the imaging lens according to any one of claims 1 to 7.

Images