Light-weight large-light-flux imaging lens and electronic equipment

Abstract

The utility model discloses a light-weight large-light-flux imaging lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged in a direction from an object side to an image side along an optical axis, the first lens has positive diopter, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has positive diopter, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the lens adopts a seven-piece design, so that the weight of the lens is reduced, and the lightweight design of the lens is realized; the imaging wave band of the lens is in the range of 400-1000 nm, and in the wave band, the imaging resolution of the lens is high, and the imaging quality is good. And by reasonably distributing the diopters of the first lens to the seventh lens, the imaging aberration of the lens can be balanced, the large light transmission and the large image surface of the lens are realized, and the color image quality can be presented under low light.

Description

Technical Field

[0001] The utility model relates to the technical field of large-aperture imaging lenses, in particular to a lightweight large-aperture imaging lens and an electronic device. Background Art

[0002] The optical lens industry has been continuously developing and progressing along with various market demands. With the continuous complexity and diversification of the lens application environment, the demands for long focal length, large aperture, wide band, and high-resolution lenses have also been increasing. Theoretically speaking, in terms of optical design, long focal length and wide band bring chromatic aberration that is difficult to correct, and a large aperture is also likely to introduce high-order aberrations into the optical system, resulting in an increase in the tolerance sensitivity of the system. The resolution of such lenses is easily limited, and it is not easy to make the lens length short, which is not conducive to miniaturization design and lightweight design. The increase in the image plane size will also bring an increase in distortion, resulting in deformation of the object image. Summary of the Utility Model

[0003] In view of this, the purpose of the present utility model is to provide a lightweight large-aperture imaging lens and an electronic device. This lens can at least solve one of the technical drawbacks mentioned in the background art.

[0004] According to one aspect of the present utility model, a lightweight large-aperture imaging lens is provided, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence along the optical axis from the object side to the image side; the first lens has a positive refractive power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has a positive refractive power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the third lens has a negative refractive power, the object side surface of the third lens is convex, and the image side surface of the third lens is concave; the fourth lens has a positive refractive power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the fifth lens has a negative refractive power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is concave; the sixth lens has a positive refractive power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex; the seventh lens has a negative refractive power. The lens adopts a seven-piece design to reduce the lens weight and achieve the lightweight design of the lens; the imaging band of the lens is in the range of 400nm to 1000nm. In this band, the lens has high-resolution imaging and good imaging quality. And by reasonably distributing the refractive powers of the first lens to the seventh lens, the imaging aberrations of the lens can be balanced, achieving large-aperture light transmission, large image plane of the lens, and presenting color image quality even in low light.

[0005] According to another aspect of the present utility model, there is provided an electronic device, including a lightweight large-aperture imaging lens as described above; and an image sensor configured to receive an image formed by the lightweight large-aperture imaging lens. In this technical solution, the advantages of the electronic device rely on the lightweight large-aperture imaging lens, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0007] Figure 1 is a schematic structural diagram of Embodiment 1 of the lightweight large-aperture imaging lens of the present utility model;

[0008] Figure 2 is the MTF curve graph of Embodiment 1 of the lightweight large-aperture imaging lens of the present utility model.

[0009] Figure 3 is the field curvature and distortion graph of Embodiment 1 of the lightweight large-aperture imaging lens of the present utility model.

[0010] Figure 4 is the optical system structure diagram of Embodiment 2 of the lightweight large-aperture imaging lens of the present utility model.

[0011] Figure 5 is the MTF curve graph of Embodiment 2 of the lightweight large-aperture imaging lens of the present utility model.

[0012] Figure 6 is the field curvature and distortion graph of Embodiment 2 of the lightweight large-aperture imaging lens of the present utility model.

[0013] Figure 7 is the optical system structure diagram of Embodiment 3 of the lightweight large-aperture imaging lens of the present utility model.

[0014] Figure 8 is the MTF curve graph of Embodiment 3 of the lightweight large-aperture imaging lens of the present utility model.

[0015] Figure 9 is the field curvature and distortion graph of Embodiment 3 of the lightweight large-aperture imaging lens of the present utility model;

[0016] Figure 10 is the schematic structural diagram of the electronic device of the present utility model.

[0017] L1, the first lens; L2, the second lens; L3, the third lens; L4, the fourth lens; L5, the fifth lens; L6, the sixth lens; L7, the seventh lens; ST, the aperture stop; G, the protective glass; IMA, the imaging surface. Detailed implementation manners

[0018] The following will further describe the present utility model in detail in conjunction with the accompanying drawings and embodiments. It should be specifically pointed out that the following embodiments are only used to illustrate the present utility model, but do not limit the scope of the present utility model. Similarly, the following embodiments are only partial embodiments of the present utility model rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present utility model.

[0019] The purpose of the present utility model is to provide a lightweight large-aperture imaging lens, which includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged in sequence along the optical axis from the object side to the image side;

[0020] The first lens L1 has a positive refractive power. The object side surface of the first lens L1 is convex, and the image side surface of the first lens L1 is concave;

[0021] The second lens L2 has a positive refractive power. The object side surface of the second lens L2 is convex, and the image side surface of the second lens L2 is concave;

[0022] The third lens L3 has a negative refractive power. The object side surface of the third lens L3 is convex, and the image side surface of the third lens L3 is concave;

[0023] The fourth lens L4 has a positive refractive power. The object side surface of the fourth lens L4 is convex, and the image side surface of the fourth lens L4 is convex;

[0024] The fifth lens L5 has a negative refractive power. The object side surface of the fifth lens L5 is concave, and the image side surface of the fifth lens L5 is concave;

[0025] The sixth lens L6 has a positive refractive power. The object side surface of the sixth lens L6 is convex, and the image side surface of the sixth lens L6 is convex;

[0026] The seventh lens L7 has a negative refractive power.

[0027] The beneficial effects of the above embodiments are as follows: The lens adopts a seven-element design, which reduces the lens weight and realizes the lightweight design of the lens; the imaging wavelength band of the lens is 400nm - 1000nm. In this wavelength band, the lens has high resolution imaging and good imaging quality. And by reasonably distributing the diopter of the first lens L1 to the seventh lens L7, the imaging aberration of the lens can be balanced, realizing large aperture and large image plane of the lens, and presenting color image quality even in low light conditions.

[0028] Further, the first lens L1 to the fifth lens L5 form the front lens group, and the sixth lens L6 and the seventh lens L7 form the rear lens group, and the rear lens group can move back and forth.

[0029] The beneficial effects of the above embodiments are as follows: By designing the rear lens group to be floating, with the change of the object distance or the ambient temperature, the rear lens group is adjusted back and forth along the optical axis for focusing, thereby improving the imaging quality.

[0030] The lens satisfies the following relationship:

[0031] 1.2 < |f1 / f| < 2; 0.8 < |f2 / f| < 2.4;

[0032] Wherein, f1 is the focal length of the front lens group, f2 is the focal length of the rear lens group, and f is the total focal length of the lens system.

[0033] The beneficial effects of the above embodiments are as follows: By setting the ratios of the front lens group and the rear lens group to the total focal length, if the ratio of the front lens group to the total focal length is higher than the upper limit value, the front aperture will become larger and the lens weight will increase, which is not conducive to the lightweight design. However, if the ratio of the front lens group to the total focal length is lower than the lower limit value, the sensitivity of the front group will become worse and the resolution will decrease; if the ratio of the rear lens group to the total focal length is higher than the upper limit value, the aperture of the rear group of lenses will become larger and the lens weight will increase, which is not conducive to the lightweight design. However, if the ratio of the rear lens group to the total focal length is lower than the lower limit value, the total length of the system will become longer, which is also not conducive to the lightweight design. In summary, satisfying the above formula is beneficial to the lightweight design.

[0034] It further includes a diaphragm ST, the diameter of the diaphragm ST is adjustable, and the lens aperture F can be changed within the range of 1.4 - 22 through the diaphragm ST.

[0035] The beneficial effects of the above embodiments are as follows: By adjusting the light incident amount through the diaphragm ST, the maximum aperture of the lens F = 1.4, with large aperture. The imaging wavelength band of the lens is 400nm - 1000nm, covering the visible light and near-infrared wavelength bands, which is beneficial for use in low light conditions, and the lens weight is small, which is beneficial for handheld use.

[0036] The lens satisfies the following relationship:

[0037] vd4 - vd5 > 35;

[0038] Among them, vd4 is the Abbe number of the fourth lens L4, and vd5 is the Abbe number of the fifth lens L5.

[0039] The beneficial effects of the above embodiments are as follows: The combination of high and low dispersion of the fourth lens L4 and the fifth lens L5 is beneficial to correcting secondary chromatic aberration and can effectively improve the imaging quality.

[0040] Furthermore, the fourth lens L4 has a positive optical power and is made of low-dispersion crown glass, and the fifth lens L5 has a negative optical power and is made of flint glass, effectively correcting the chromatic aberration of the lens and being beneficial to maintaining good imaging under a wide spectrum.

[0041] The present invention will be described in more detail below with reference to the following table. It should be noted that the following table is only a specific embodiment of the present invention and not a restrictive example.

[0042] For the convenience of description, in Table 1, surface number 1 and surface number 2 are the object side and the image side of the first lens L1 respectively; surface number 3 and surface number 4 are the object side and the image side of the second lens L2 respectively; surface number 5 is the surface of the aperture ST; surface number 6 and surface number 7 are the object side and the image side of the third lens L3 respectively; surface number 7 and surface number 8 are the object side and the image side of the fourth lens L4 respectively; surface number 8 and surface number 9 are the object side and the image side of the fifth lens L5 respectively; surface number 10 and surface number 11 are the object side and the image side of the sixth lens L6 respectively; surface number 12 and surface number 13 are the object side and the image side of the seventh lens L7 respectively; surface number 14 and surface number 15 are the object side and the image side of the protective glass G respectively; surface number 16 is the imaging surface IMA.

[0043] For the optical structure of Embodiment 1, please refer to Figure 1 , and the specific parameters of this Embodiment 1 are shown in Table 1 below. In this Embodiment 1, the lens focal length f' = 65mm, the field of view FOV = 19, and the total length TTL = 76.9mm.

[0044] Table 1 Lens Parameter Table of Embodiment 1

[0045]

[0046]

[0047] Among them, the conditional formula of Embodiment 1 of the present invention is as follows:

[0048] (1) The focal length of the front lens group f1 = 118.1mm; the focal length of the rear lens group f2 = 66.9mm; the lens focal length f' = 65mm. From this, it can be deduced that |f1 / f| = 1.817 and |f2 / f| = 1.029

[0049] (2) vd4 - vd5 = 39.601

[0050] The following are the explanatory notes for each drawing in Embodiment 1:

[0051] Figure 1 It is the optical system structure diagram of the lens in Embodiment 1. It can be seen from the figure that the aperture stop ST is located between the second lens L2 and the third lens L3, which is beneficial to reducing the apertures of the first lens L1 and the second lens L2 and realizing the lightweight design of the lens. The third lens L3, the fourth lens L4, and the fifth lens L5 are a three - cemented lens group, which is beneficial to the lightweight design of the lens and reduces the assembly tolerance of the lens. In this embodiment, both the object side and the image side of the seventh lens L7 are concave surfaces.

[0052] Figure 2 It is the MTF curve graph of Embodiment 1. Among them, the abscissa is the frequency, and the unit is line pairs. The ordinate is the MTF value, and the unit is none. It can be seen from the figure that this MTF (Modulation Transfer Function) curve graph shows in detail the excellent optical performance of the lens in a wide spectral range (covering the ultraviolet light from 400nm to the infrared light region of 1000nm). In this figure, under the full - field condition, the lens can still stably maintain a contrast above 0.3 at a spatial frequency as high as 42 line pairs per millimeter (lp / mm), and this data significantly proves that the lens has extremely high resolution ability and excellent imaging.

[0053] Figure 3 It is the distortion curve graph of Embodiment 1. It can be seen from the figure that the distortion of each field of view of the lens is positive and less than 3%, the imaging picture has no deformation, the imaging quality is excellent, and there is no common edge compression phenomenon. This means that even at the outermost edge of the picture, details and colors can be clearly shown without sacrificing the imaging quality due to the increase in the field - of - view angle.

[0054] For the convenience of description, in Table 2, surface number 1 and surface number 2 are the object side and the image side of the first lens L1 respectively; surface number 3 is the surface of the aperture stop ST; surface number 4 and surface number 5 are the object side and the image side of the second lens L2 respectively; surface number 6 and surface number 7 are the object side and the image side of the third lens L3 respectively; surface number 7 and surface number 8 are the object side and the image side of the fourth lens L4 respectively; surface number 8 and surface number 9 are the object side and the image side of the fifth lens L5 respectively; surface number 10 and surface number 11 are the object side and the image side of the sixth lens L6 respectively; surface number 12 and surface number 13 are the object side and the image side of the seventh lens L7 respectively; surface number 14 and surface number 15 are the object side and the image side of the protective glass G respectively; surface number 16 is the surface of the imaging plane IMA.

[0055] For the optical structure of Embodiment 2, please refer to Figure 2, the specific parameters of this Embodiment 2 are shown in Table 2 below. In this Embodiment 2, the focal length of the lens f' = 65 mm, the field of view FOV = 19.2, and the total length TTL = 75 mm.

[0056] Table 2 Lens Parameter Table of Embodiment 2

[0057] Surface Number Type Radius of Curvature Thickness Interval Material Refractive Index Abbe Number Diopter 1 First Lens 41.76324 5.289626 Glass 1.945958 17.943914 80.1 2 87.32759 2.755228 3 Diaphragm Infinity -1.146493 4 Second Lens 42.89821 4.637886 Glass 1.754998 52.337421 75.5 5 165.2748 2.723707 6 Third Lens 198.6229 0.9299658 Glass 1.805189 25.47729 -24.5 7 Fourth Lens 17.92206 12.02715 Glass 1.617998 63.405767 22.7 8 Fifth Lens -48.44748 0.9541603 Glass 1.846666 23.787324 -33.3 9 68.09598 23.18571 10 Sixth Lens 41.16376 4.005662 Glass 1.784721 25.719658 34.4 11 -75.09623 9.191008 12 Seventh Lens -27.4924 0.6781623 Glass 1.772501 49.613485 -31.2 13 195.6921 1.989053 14 Protective Glass Infinity 0.9097122 Glass 1.516797 64.212351 15 Infinity 6.880729 16 Imaging Plane Infinity

[0058] Among them, the conditional formula of Embodiment 2 of the present invention is as follows:

[0059] (1) The focal length of the front lens group f1 = 104.1 mm; the focal length of the rear lens group f2 = 143.34 mm; the focal length of the lens f' = 65 mm. From this, it can be deduced that |f1 / f| = 1.602 and |f2 / f| = 2.025

[0060] (2) vd4 - vd5 = 39.618

[0061] The following are the explanatory notes for each drawing in Embodiment 2:

[0062] Figure 4 is the optical system structure diagram of the lens in Embodiment 2. It can be seen from the figure that the aperture stop ST is located between the first lens L1 and the second lens L2, which is beneficial to reducing the aperture of the first lens L1 and realizing the lightweight design of the lens. The third lens L3, the fourth lens L4, and the fifth lens L5 are a triplet lens group, which is beneficial to the lightweight design of the lens and reduces the assembly tolerance of the lens. In this embodiment, both the object side and the image side of the seventh lens L7 are concave surfaces.

[0063] Figure 5 is the MTF curve graph of Embodiment 2. Among them, the abscissa is the frequency, and the unit is line pairs. The ordinate is the MTF value, and the unit is none. It can be seen from the figure that this MTF (Modulation Transfer Function) curve graph shows in detail the excellent optical performance of the lens in a wide spectral range (covering the ultraviolet light from 400 nm to the infrared light region of 1000 nm). In this figure, under the full field of view condition, the contrast of the lens can still be stably maintained above 0.3 at a spatial frequency as high as 42 line pairs per millimeter (lp / mm), which significantly proves that the lens has extremely high resolution ability and excellent imaging quality.

[0064] Figure 6 is the distortion curve graph of Embodiment 2. It can be seen from the figure that the distortion of each field of view of the lens is positive and less than 3%, the imaging picture is not deformed, the imaging quality is excellent, and there is no common edge compression phenomenon. This means that even at the outermost edge of the picture, details and colors can be clearly displayed without sacrificing the imaging quality due to the increase in the field of view.

[0065] For convenience of description, in Table 3, surface number 1 and surface number 2 are the object side and the image side of the first lens L1 respectively; surface number 3 is the surface of the aperture ST; surface number 4 and surface number 5 are the object side and the image side of the second lens L2 respectively; surface number 5 and surface number 6 are the object side and the image side of the third lens L3 respectively; surface number 7 and surface number 8 are the object side and the image side of the fourth lens L4 respectively; surface number 8 and surface number 9 are the object side and the image side of the fifth lens L5 respectively; surface number 10 and surface number 11 are the object side and the image side of the sixth lens L6 respectively; surface number 12 and surface number 13 are the object side and the image side of the seventh lens L7 respectively; surface number 14 and surface number 15 are the object side and the image side of the protective glass G respectively; surface number 16 is the surface of the imaging plane IMA.

[0066] For the optical structure of Embodiment 3, please refer to Figure 3 , and the specific parameters of this Embodiment 3 are shown in Table 3 below. In this Embodiment 3, the focal length of the lens f' = 65 mm, the field of view FOV = 19.5, and the total length TTL = 75 mm.

[0067] Table 3 Lens Parameter Table of Embodiment 3

[0068] Surface Number Type Radius of Curvature Thickness Interval Material Refractive Index Abbe Number Diopter 1 First Lens 46.41361 5.576219 Glass 1.945958 17.943914 73.6 2 130.8366 2.002478 3 Diaphragm Infinity 0.8445762 4 Second Lens 38.83135 5.248919 Glass 1.772501 49.613485 61.3 5 Third Lens 202.6977 1.154132 Glass 1.805189 25.47729 -27.2 6 19.74377 0.1 7 Fourth Lens 19.80344 11.28072 Glass 1.617998 63.405767 24.9 8 Fifth Lens -54.08745 0.9719981 Glass 1.846666 23.787324 -28 9 42.56614 23.2392 10 Sixth Lens 45.48068 3.855122 Glass 1.784721 25.719658 37.9 11 -82.68551 10.88606 12 Seventh Lens -27.90344 0.6854517 Glass 1.772501 49.613485 -36.2 13 -10726.08 1.130055 14 Protective Glass Infinity 0.9097122 Glass 1.516797 64.212351 15 Infinity 7.160686 16 Imaging Plane Infinity

[0069] Among them, the conditional expressions of Embodiment 3 of the present invention are as follows:

[0070] (1) The focal length of the front lens group f1 = 106.9 mm; the focal length of the rear lens group f2 = 129.2 mm; the focal length of the lens f' = 65 mm. From this, it can be deduced that |f1 / f| = 1.645 and |f2 / f| = 1.988

[0071] (2) vd4 - vd5 = 39.618

[0072] The following are the explanatory notes for each drawing in Embodiment 3:

[0073] Figure 7 It is the optical system structure diagram of the lens in Embodiment 3. It can be seen from the figure that the aperture ST is located between the first lens L1 and the second lens L2, which is beneficial to reducing the aperture of the first lens L1 and realizing the lightweight design of the lens. The second lens L2 and the third lens L3 are a cemented lens group, and the fourth lens L4 and the fifth lens L5 are a cemented lens group, which is beneficial to the lightweight design of the lens and reduces the assembly tolerance of the lens. In this embodiment, the object side of the seventh lens L7 is concave and the image side is flat.

[0074] Figure 8MTF curve graph for Embodiment 3. Among them, the abscissa is the frequency, with the unit of line pairs. The ordinate is the MTF value, without unit. It can be seen from the figure that this MTF (Modulation Transfer Function) curve graph shows in detail the excellent optical performance of the lens within a wide spectral range (covering the ultraviolet light from 400 nm to the infrared light region of 1000 nm). In this figure, under the full field of view condition, the contrast of the lens can still be stably maintained above 0.3 at a spatial frequency as high as 42 line pairs per millimeter (lp / mm). This data significantly proves that the lens has extremely high resolution ability and excellent imaging quality.

[0075] Figure 9 Distortion curve graph for Embodiment 3. It can be seen from the figure that the distortion of each field of view of the lens is positive and less than 3%. The imaging picture has no distortion, the imaging quality is excellent, and there is no common edge compression phenomenon. This means that even at the outermost edge of the picture, details and colors can be clearly shown without sacrificing imaging quality due to the increase in the field of view angle.

[0076] On the other hand, now referring to Figure 10 , a schematic structural diagram of the electronic device A according to the present utility model will be given. Figure 10 It is a schematic diagram of an electronic device (camera) that uses any one of the lightweight large-aperture imaging lenses according to Embodiments 1 to 3 in a camera optical system.

[0077] In Figure 10 , the reference numeral A2 represents the main body of the electronic device, and the reference numeral A1 represents a camera optical system (interchangeable lens) including any one of the lightweight large-aperture imaging lenses according to Examples 1 to 3. The reference numeral A3 represents an image sensor (photoelectric conversion element) such as a CMOS image sensor or a CCD image sensor. The image sensor is built into the camera body A2 and receives light (the optical image formed by the camera optical system A1) from the camera optical system A1 and performs photoelectric conversion.

[0078] By using the lightweight large-aperture imaging lens according to any one of Embodiments 1 to 3 in an electronic device such as a digital still camera, an electronic device with high optical performance can be obtained.

[0079] Each example can provide an electronic device with high optical performance.

[0080] Although the present utility model has been described with reference to typical embodiments, it should be understood that the present utility model is not limited to the disclosed typical embodiments. The scope of the following claims will be given the broadest interpretation to cover all such modifications and equivalent structures and functions.

Claims

1. A lightweight large-aperture imaging lens, characterized in that, It includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence in a direction from the object side to the image side along the optical axis; The first lens has a positive refractive power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; The second lens has a positive refractive power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; The third lens has a negative refractive power, the object side surface of the third lens is convex, and the image side surface of the third lens is concave; The fourth lens has a positive refractive power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; The fifth lens has a negative refractive power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is concave; The sixth lens has a positive refractive power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex; The seventh lens has a negative refractive power; The lens satisfies the following relational expressions: 1.2 < |f1 / f| < 2; 0.8 < |f2 / f| < 2.4; Wherein, f1 is the focal length of the front lens group, f2 is the focal length of the rear lens group, and f is the total focal length of the lens system.

2. The lightweight large-aperture imaging lens according to claim 1, wherein The first lens to the fifth lens form a front lens group, and the sixth lens and the seventh lens form a rear lens group, and the rear lens group can move back and forth along the optical axis.

3. The lightweight large-aperture imaging lens according to claim 1, wherein It further includes a diaphragm, and the diaphragm is an adjustable diaphragm, and the aperture adjustment range is between 1.4 and 22.

4. The lightweight large-aperture imaging lens according to claim 1, wherein The lens satisfies the following relational expression: vd4 - vd5 > 35; Wherein, vd4 is the Abbe number of the fourth lens, and vd5 is the Abbe number of the fifth lens.

5. A lightweight large-aperture imaging lens according to claim 1, characterized in that, The third lens, the fourth lens, and the fifth lens form a first cemented lens group.

6. The lightweight large-aperture imaging lens according to claim 1, wherein The second lens and the third lens form a second cemented lens group; the fourth lens and the fifth lens form a third cemented lens group.

7. The lightweight large-aperture imaging lens according to claim 1, wherein The fourth lens has a positive optical power and is made of a low-dispersion crown glass, and the fifth lens has a negative optical power and is made of a flint glass.

8. An electronic device, characterized in that, A lightweight large-aperture imaging lens according to any one of claims 1-7; and An image sensor configured to receive an image formed by the lightweight large-aperture imaging lens.

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