An optical imaging lens

Abstract

This invention discloses an optical imaging lens. It comprises, in order from the object side to the image side, a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, and a sixth lens. The first lens has negative refractive power, with a convex object side and a concave image side. The second lens has negative refractive power. The third lens has positive refractive power, with a convex object side and a convex image side. The fourth lens has positive refractive power, with a convex object side and a convex image side. The fifth lens has negative refractive power. The sixth lens has negative refractive power, etc. The optical imaging lens of this invention has an optical TTL of less than 9mm, employs a 6-element design, has a small overall size, and is easy to install and use. The lens has a DFOV of 165°, and an MTF greater than 0.5 at 125 lp / mm, exhibiting good image quality.

Description

Technical Field

[0001] This invention relates to the field of wide field-of-view lens technology, and more particularly to an optical imaging lens. Background Technology

[0002] A wide-angle lens is a photographic lens with a shorter focal length than a standard lens, a wider angle of view than a standard lens, a longer focal length than a fisheye lens, and a narrower angle of view than a fisheye lens. As CMOS / CCD sensor chips achieve increasingly higher pixel counts, the demands on wide-angle lenses, such as resolution, are also increasing. Existing wide-angle lenses suffer from the following three problems:

[0003] 1. The excessively large optical TTL and numerous lens elements result in excessively high overall lens cost and weight, and also limit its installation and use.

[0004] 2. If the incident angle of a conventional wide-angle lens is too large, it will result in poor image quality at the edges of the field of view;

[0005] 3. In order to improve resolution and correct chromatic aberration, wide-angle lenses on the market often use multiple glass elements or cemented lenses, which have the disadvantages of high cost and large size. Summary of the Invention

[0006] In view of this, the object of the present invention is to provide an optical imaging lens that can solve at least one of the technical problems mentioned in the background art.

[0007] According to one aspect of the present invention, an optical imaging lens is provided, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side;

[0008] The first lens has negative refractive power, the object side of the lens is convex, and the image side of the lens is concave.

[0009] The second lens has negative refractive power;

[0010] The third lens has positive refractive power, and the object-side surface of the lens is convex, as is the image-side surface of the lens.

[0011] The fourth lens has positive refractive power, and the object-side surface of the lens is convex, as is the image-side surface of the lens.

[0012] The fifth lens has negative refractive power;

[0013] The sixth lens has negative refractive power and its shape is slightly M-shaped;

[0014] The optical imaging lens satisfies the following condition:

[0015] 2.9mm <EFL<3.7mm

[0016] DFOV = 165°

[0017] Fno = 2.3

[0018] TTL < 9.0mm

[0019] Where EFL is the effective focal length, DFOV is the field of view, Fno is the relative aperture, and TTL is the total length of the lens.

[0020] In the above technical solution, a six-element lens architecture is adopted. By rationally allocating the optical power of each lens element and optimizing the surface shape, thickness, and inter-element distance, the lens can achieve a wide angle and good image quality. The lens has an optical TTL of less than 9mm, and the overall size of the lens is small due to the six-element design, making it easy to install and use. The lens has a DFOV of 165° and an MTF greater than 0.5 at 125lp / mm, exhibiting good image quality.

[0021] In some embodiments, the optical imaging lens satisfies the following condition:

[0022] -12 <f1<-6

[0023] -6.5 <f2<-4

[0024] 3 <f3<4.5

[0025] 2 <f4<3.5

[0026] -7 <f5<-4

[0027] -14 <f6<-5

[0028] Where f1, f2, f3, f4, f5, and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, respectively.

[0029] In the above technical solution, by reasonably matching the refractive power of each group of lenses, higher resolution and ultra-wide field of view are achieved.

[0030] In some embodiments, the optical imaging lens satisfies the following condition:

[0031] 2<|f1 / f|<4

[0032] 1<|f2 / f|<2

[0033] 1<|f3 / f|<2

[0034] 0.5 < |f4 / f| < 1.5

[0035] 1 < |f5 / f| < 2.5

[0036] 1 < |f6 / f| < 4.5

[0037] Where f is the overall focal length of the lens, 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, and f6 is the focal length of the sixth lens.

[0038] In the above technical solutions, the above formula can better eliminate advanced aberrations and improve lens performance, while also reducing the tolerance sensitivity of the lens caused by tilting / eccentricity during the assembly process.

[0039] In some embodiments, the optical imaging lens satisfies the following condition:

[0040] 1.5 <nd1<1.8,45<vd1<75

[0041] 1.5 <nd2<1.6,50<vd2<60

[0042] 1.5 <nd3<1.6,50<vd3<70

[0043] 1.5 <nd4<1.7,50<vd4<70

[0044] 1.6 <nd5<1.7,18<vd5<25

[0045] 1.5 <nd6<1.7,20<vd6<70

[0046] Wherein, nd1, nd2, nd3, nd4, nd5, and nd6 are the refractive indices of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are the Abbe numbers of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively.

[0047] In the above technical solutions, satisfying the above formula can help eliminate the influence of color difference, reduce field curvature, and correct coma.

[0048] In some embodiments, the optical imaging lens satisfies the following condition:

[0049] 1.7 <SD6 / AC5<2.2

[0050] Wherein, SD6 is the effective half-aperture of the sixth lens, and AC5 is the air gap between the fifth and sixth lenses on the optical axis.

[0051] In the above technical solution, under the condition that the sixth lens has a slightly M-shaped shape and the above-mentioned condition, the light can be kept relatively smooth, avoiding excessive optical bending angle that would affect the imaging. At the same time, the lens can also have a good imaging effect even with a large CRA.

[0052] In some embodiments, the optical imaging lens satisfies the following condition:

[0053] 1.5 <ALT / AAG<2.5

[0054] Wherein, ALT is the sum of the center thicknesses of the first to sixth lenses along the optical axis, and AAG is the sum of the air gaps of the first to sixth lenses along the optical axis.

[0055] In the above technical solutions, satisfying the above formula can effectively reduce the size of the lens group and avoid the optical lens group from being too large.

[0056] In some embodiments, the optical imaging lens satisfies the following condition:

[0057] 2.4 <f / BFL<3.7

[0058] Where f is the overall focal length of the lens, and BFL is the distance on the optical axis from the sixth lens to the image plane.

[0059] In the above technical solutions, satisfying the above formula can make the overall optical length of the lens shorter and the assembly sensitivity less.

[0060] In some embodiments, the optical imaging lens comprises two glass spherical lenses and four plastic aspherical lenses.

[0061] In the above technical solution, the design of four plastic aspherical lenses plus one glass lens is beneficial for correcting secondary spectral and higher-order aberrations. Simultaneously, the appropriate selection of glass lens material optimizes the optical structure, facilitates lens design, and reduces lens costs. The hybrid glass-plastic structure design effectively corrects lens temperature drift, ensuring stable operation under varying temperature conditions. Attached Figure Description

[0062] 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 these drawings without creative effort.

[0063] Figure 1 This is one of the schematic diagrams of the lens structure of one embodiment of the optical imaging lens of the present invention;

[0064] Figure 2 This is a second schematic diagram of the lens structure of one embodiment of the optical imaging lens of the present invention;

[0065] Figure 3This is an MTF curve of a lens in the visible light range of 435nm-650nm, representing one embodiment of the optical imaging lens of the present invention.

[0066] Figure 4 This is a defocus curve of a lens in the visible light range of 435nm-650nm, which is one of the optical imaging lens embodiments of the present invention.

[0067] Figure 5 This is a lateral chromatic aberration curve of a lens in the visible light range of 435nm-650nm, which is one embodiment of the optical imaging lens of the present invention.

[0068] Figure 6 This is a longitudinal chromatic aberration curve of a lens in the visible light range of 435nm-650nm, which is one of the optical imaging lens embodiments of the present invention.

[0069] Figure 7 This is a field curvature and distortion diagram of a lens in the visible light 435nm-650nm range, which is one of the optical imaging lens embodiments of the present invention.

[0070] Figure 8 This is a CRA curve of a lens in the visible light range of 435nm-650nm, representing one embodiment of the optical imaging lens of the present invention.

[0071] Figure 9 This is one of the schematic diagrams of the lens structure in the second embodiment of the optical imaging lens of the present invention;

[0072] Figure 10 This is the second schematic diagram of the lens structure of the second embodiment of the optical imaging lens of the present invention;

[0073] Figure 11 This is the MTF curve of the lens in the visible light 435nm-650nm range of the second embodiment of the optical imaging lens of the present invention;

[0074] Figure 12 This is a defocus curve of the lens in the visible light 435nm-650nm range of the second embodiment of the optical imaging lens of the present invention.

[0075] Figure 13 This is a lateral chromatic aberration curve of the lens in the visible light 435nm-650nm range, which is a second embodiment of the optical imaging lens of the present invention.

[0076] Figure 14 This is a longitudinal chromatic aberration curve of the lens in the visible light 435nm-650nm range of the second embodiment of the optical imaging lens of the present invention;

[0077] Figure 15 This is a field curvature and distortion diagram of the lens in the visible light 435nm-650nm range of the second embodiment of the optical imaging lens of the present invention;

[0078] Figure 16 This is a CRA curve of the lens in the visible light 435nm-650nm range of the second embodiment of the optical imaging lens of the present invention;

[0079] Figure 17 This is one of the schematic diagrams of the lens structure in the second embodiment of the optical imaging lens of the present invention;

[0080] Figure 18 This is the second schematic diagram of the lens structure of the second embodiment of the optical imaging lens of the present invention;

[0081] Figure 19 This is the MTF curve of the lens in the visible light 435nm-650nm range of the second embodiment of the optical imaging lens of the present invention;

[0082] Figure 20 This is a defocus curve of the lens in the visible light 435nm-650nm range of the second embodiment of the optical imaging lens of the present invention.

[0083] Figure 21 This is a lateral chromatic aberration curve of the lens in the visible light 435nm-650nm range, which is a second embodiment of the optical imaging lens of the present invention.

[0084] Figure 22 This is a longitudinal chromatic aberration curve of the lens in the visible light 435nm-650nm range of the second embodiment of the optical imaging lens of the present invention;

[0085] Figure 23 This is a field curvature and distortion diagram of the lens in the visible light 435nm-650nm range of the second embodiment of the optical imaging lens of the present invention;

[0086] Figure 24 This is a CRA curve of the lens in the visible light range of 435nm-650nm, which is a second embodiment of the optical imaging lens of the present invention. Detailed Implementation

[0087] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the invention. Similarly, the following embodiments are only some, not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0088] The present invention provides an optical imaging lens that can solve at least one of the technical problems mentioned in the background art.

[0089] Comprising: from the object side to the image side, there are a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, and a sixth lens in sequence; the first lens has a negative refractive power, the object side surface of this lens is convex, and the image side surface of this lens is concave; the second lens has a negative refractive power; the third lens has a positive refractive power, the object side surface of this lens is convex, and the image side surface of this lens is convex; the fourth lens has a positive refractive power, the object side surface of this lens is convex, and the image side surface of this lens is convex; the fifth lens has a negative refractive power; the sixth lens has a negative refractive power, and the shape of this lens presents a slight M shape; 1. A combination of two glass spherical surfaces and four plastic aspherical surfaces is used. The first lens to the third lens are the front group of the lens, and the fourth lens to the sixth lens are the rear group of the lens. 2. The aperture stop is located between the third lens and the fourth lens. The optical imaging lens satisfies the following conditional expressions: 2.9mm < EFL < 3.7mm, DFOV = 165°, Fno = 2.3, TTL < 9.0mm. Where, EFL is the effective focal length, DFOV is the field angle, Fno is the relative aperture, and TTL is the total length of the lens. This solution adopts a six-lens architecture. By reasonably distributing the optical power of each lens, optimizing the surface shape, thickness of each lens, and the distance between lenses, the lens can have a wide angle and good imaging quality. The optical TTL of the lens is less than 9mm. Using a 6-lens design, the overall volume of the lens is small, and it is convenient for installation and use; the DFOV of this lens is 165°, and the MTF at 125lp / mm is greater than 0.5, having good imaging quality.

[0090] The optical imaging lens satisfies the following conditional expressions: -12 < f1 < -6, -6.5 < f2 < -4, 3 < f3 < 4.5, 2 < f4 < 3.5, -7 < f5 < -4, -14 < f6 < -5; where, f1, f2, f3, f 4、 f5, f6 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively. By reasonably matching the refractive powers of the lenses in each group, there is a higher resolution and an ultra-wide field angle.

[0091] In this embodiment, the optical imaging lens satisfies the following conditional expressions: 2 < |f1 / f| < 4, 1 < |f2 / f| < 2, 1 < |f3 / f| < 2, 0.5 < |f4 / f| < 1.5, 1 < |f5 / f| < 2.5, 1 < |f6 / f| < 4.5; where, f is the overall focal length of the lens, 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, and f6 is the focal length of the sixth lens. Satisfying the above formula can better eliminate the higher-order aberrations, improve the lens performance, and at the same time can also reduce the tolerance sensitivity problems such as tilt / eccentricity generated by the lenses during the assembly process.

[0092] In some embodiments, the optical imaging lens satisfies the following conditional expressions: 1.5 < nd1 < 1.8, 45 < vd1 < 75, 1.5 < nd2 < 1.6, 50 < vd2 < 60, 1.5 < nd3 < 1.6, 50 < vd3 < 70,

[0093] 1.5 < nd4 < 1.7, 50 < vd4 < 70, 1.6 < nd5 < 1.7, 18 < vd5 < 25, 1.5 < nd6 < 1.7, 20 < vd6 < 70; where nd1, nd2, nd3, nd4, nd5, nd6 are the refractive indices of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively, and vd1, vd2, vd3, vd4, vd5, vd6 are the Abbe numbers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively. Satisfying the above formula can help eliminate the influence of chromatic aberration, reduce field curvature, and correct coma.

[0094] The optical imaging lens satisfies the following conditional expressions: 1.7 < SD6 / AC5 < 2.2, 1.5 < ALT / AAG < 2.5, 2.4 < f / BFL < 3.7; where SD6 is the effective semi-aperture of the sixth lens, AC5 is the air separation between the fifth lens and the sixth lens on the optical axis, ALT is the total central thickness of the first to the sixth lenses on the optical axis, AAG is the total air gap of the first to the sixth lenses on the optical axis, f is the overall focal length of the lens, and BFL is the distance from the sixth lens of the lens to the imaging plane on the optical axis. Under the condition that the shape of the sixth lens presents a slight M shape and 1.7 < SD6 / AC5 < 2.2, it can ensure that the light is relatively smooth, avoid excessive optical bending angles from affecting imaging, and at the same time enable the lens to have a good imaging effect even with a large CRA. Satisfying 1.5 < ALT / AAG < 2.5 can effectively reduce the size of the lens group and avoid the excessive volume of the optical lens group. Satisfying 2.4 < f / BFL < 3.7 can make the optical total length of the lens shorter and the assembly sensitivity smaller.

[0095] The optical imaging lens includes two glass spherical lenses and four plastic aspherical lenses. The design of using four plastic aspherical lenses plus one glass lens is beneficial for correcting secondary spectrum and higher-order aberrations; at the same time, reasonably selecting the material of the glass lens can better optimize the optical structure and is conducive to the lens structure design, reducing the lens cost. Adopting a glass-plastic hybrid structure design can well correct the temperature drift of the lens and can well ensure the working state under different temperature conditions. The optical TTL of the lens is less than 9 mm, and its small volume makes its installation and use extremely convenient. The large field of view angle, DFOV = 165°, improves the overall field of view range of the lens and enhances the practicality.

[0096] The present invention will be further described below with reference to several embodiments. In various embodiments, the aperture size, radius of curvature, thickness, material selection, refractive index, dispersion coefficient, and focal length of each lens in the wide-angle lens are different. For specific differences, please refer to the parameter tables of each embodiment. It should be noted that surfaces 0-17 in the table represent the surfaces through which light enters and exits from the object side to the image side. Those skilled in the art can understand the position represented by each surface number through the relevant parameter tables and lens structure diagrams, which will not be repeated here. In the figure, A represents the object side, B represents the image side, ST represents the aperture stop, first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, and filter 7. The meanings of the structural diagrams of each embodiment below are the same and will not be repeated. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered as equivalent substitutions and are included within the protection scope of the present invention.

[0097] Example 1

[0098] Please refer to Tables 1 and 2 for the relevant parameters of each lens provided in this embodiment, and refer to [Table 2 for lens structure]. Figure 1 , Figure 2 .

[0099] Table 1 Lens-related parameters in one of the embodiments.

[0100]

[0101] Table 2. Aspheric coefficient parameter table for one of the embodiments.

[0102]

[0103] Please see Figure 3-8 , Figure 3 The image shows the MTF curve of the lens in Example 1 under visible light (435nm-650nm). As can be seen from the image, the lens has an MTF greater than 0.6 at 125 lp / mm, indicating excellent image quality and high lens resolution. Figure 4 This is a defocus curve of the lens in Example 1 under visible light 435nm-650nm;

[0104] As can be seen from the figure, the defocus curves of the lens in each field of view under visible light are relatively concentrated, and the defocus amount is small; Figure 5 The image shows the lateral chromatic difference curve of the lens in Example 1 under visible light 435nm-650nm; as can be seen from the image, the chromatic difference is less than 3um, indicating small chromatic difference and high color reproduction. Figure 6The figure shows the longitudinal color difference curve of the lens in Example 1 under visible light 435nm-650nm. As can be seen from the figure, the color difference on the lens axis is less than ±0.03mm, the color reproduction is good, the color difference is small, and the blue-purple fringing phenomenon is not obvious. Figure 7 The image shows the field curvature and distortion of the lens in Example 1 under visible light 435nm-650nm; as can be seen from the image, the field curvature and distortion of the lens at each wavelength are well controlled, effectively improving image quality. Figure 8 The figure shows the CRA curve of the lens in Example 1 under visible light 435nm-650nm. As can be seen from the figure, the maximum CRA of the lens is greater than 34°, which can better match the sensor CRA and make the lens less prone to vignetting and color cast.

[0105] Example 2

[0106] Please refer to Tables 3 and 4 for the relevant parameters of each lens provided in this embodiment, and refer to [Table 4 for lens structure]. Figure 9 , Figure 10 .

[0107] Table 3 Lens-related parameters in Example 2

[0108]

[0109] Table 4. Aspheric coefficient parameter table for Example 2

[0110]

[0111] Please see Figure 11-16 , Figure 11 The image shows the MTF curve of the lens in Example 1 under visible light (435nm-650nm). As can be seen from the image, the lens has an MTF greater than 0.5 at 125 lp / mm, indicating excellent image quality and high lens resolution. Figure 12 The figure shows the defocus curves of the lens in Example 1 under visible light 435nm-650nm. As can be seen from the figure, the defocus curves of the lens in each field of view under visible light are relatively concentrated and the defocus amount is small. Figure 13 The image shows the lateral chromatic difference curve of the lens in Example 1 under visible light 435nm-650nm; as can be seen from the image, the chromatic difference is less than 3um, indicating small chromatic difference and high color reproduction. Figure 14 The figure shows the longitudinal color difference curve of the lens in Example 1 under visible light 435nm-650nm. As can be seen from the figure, the color difference on the lens axis is less than ±0.03mm, the color reproduction is good, the color difference is small, and the blue-purple fringing phenomenon is not obvious. Figure 15 The image shows the field curvature and distortion of the lens in Example 1 under visible light 435nm-650nm; as can be seen from the image, the field curvature and distortion of the lens at each wavelength are well controlled, effectively improving image quality. Figure 16The figure shows the CRA curve of the lens in Example 1 under visible light 435nm-650nm. As can be seen from the figure, the maximum CRA of the lens is greater than 34°, which can better match the sensor CRA and make the lens less prone to vignetting and color cast.

[0112] Example 3

[0113] Please refer to Tables 5 and 6 for the relevant parameters of each lens provided in this embodiment, and refer to [Table 6 for lens structure]. Figure 17 , Figure 18 .

[0114] Table 5. Parameters related to the three lenses in the embodiment.

[0115]

[0116] Table 6. Lens-related parameters in Example 3

[0117]

[0118] Please see Figure 19-24 , Figure 19 The image shows the MTF curve of the lens in Example 1 under visible light (435nm-650nm). As can be seen from the image, the lens has an MTF greater than 0.5 at 125 lp / mm, indicating excellent image quality and high lens resolution. Figure 20 The figure shows the defocus curves of the lens in Example 1 under visible light 435nm-650nm. As can be seen from the figure, the defocus curves of the lens in each field of view under visible light are relatively concentrated and the defocus amount is small. Figure 21 The image shows the lateral chromatic difference curve of the lens in Example 1 under visible light 435nm-650nm; as can be seen from the image, the chromatic difference is less than 3um, indicating small chromatic difference and high color reproduction. Figure 22 The figure shows the longitudinal color difference curve of the lens in Example 1 under visible light 435nm-650nm. As can be seen from the figure, the color difference on the lens axis is less than ±0.03mm, the color reproduction is good, the color difference is small, and the blue-purple fringing phenomenon is not obvious. Figure 23 The image shows the field curvature and distortion of the lens in Example 1 under visible light 435nm-650nm; as can be seen from the image, the field curvature and distortion of the lens at each wavelength are well controlled, effectively improving image quality. Figure 24 The figure shows the CRA curve of the lens in Example 1 under visible light 435nm-650nm. As can be seen from the figure, the maximum CRA of the lens is greater than 34°, which can better match the sensor CRA and make the lens less prone to vignetting and color cast.

[0119] The above description is only a part of the embodiments of the present invention and does not limit the scope of protection of the present invention. Any equivalent device or equivalent process transformation made based on the content of the present invention specification and drawings, or direct or indirect application in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that, include: From the object side to the image side, the lenses are arranged in the following order: first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens. The first lens has negative refractive power, the object side of the lens is convex, and the image side of the lens is concave. The second lens has negative refractive power; The third lens has positive refractive power, and the object-side surface of the lens is convex, as is the image-side surface of the lens. The fourth lens has positive refractive power, and the object-side surface of the lens is convex, as is the image-side surface of the lens. The fifth lens has negative refractive power; The sixth lens has negative refractive power; The optical imaging lens satisfies the following condition: 2.9mm <EFL<3.7mm DFOV = 165° Fno = 2.3 TTL < 9.0mm Where EFL is the effective focal length, DFOV is the field of view, Fno is the relative aperture, and TTL is the total length of the lens.

2. The optical imaging lens as described in claim 1, characterized in that, The optical imaging lens satisfies the following condition: -12<f1<-6 -6.5<f2<-4 3<f3<4.5 2<f4<3.5 -7<f5<-4 -14<f6<-5 Where f1, f2, f3, f4, f5, and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, respectively.

3. An optical imaging lens as described in claim 1, characterized in that, The optical imaging lens satisfies the following condition: 2<|f1 / f|<4 1<|f2 / f|<2 1<|f3 / f|<2 0.5 < |f4 / f| < 1.5 1 < |f5 / f| < 2.5 1 < |f6 / f| < 4.5 Where f is the overall focal length of the lens, 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, and f6 is the focal length of the sixth lens.

4. An optical imaging lens as described in claim 1, characterized in that, The optical imaging lens satisfies the following condition: 1.5 <nd1<1.8,45<vd1<75 1.5 <nd2<1.6,50<vd2<60 1.5 <nd3<1.6,50<vd3<70 1.5 <nd4<1.7,50<vd4<70 1.6 <nd5<1.7,18<vd5<25 1.5 <nd6<1.7,20<vd6<70 Wherein, nd1, nd2, nd3, nd4, nd5, and nd6 are the refractive indices of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are the Abbe numbers of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively.

5. An optical imaging lens as described in claim 1, characterized in that, The optical imaging lens satisfies the following condition: 1.7 <SD6 / AC5<2.2 Wherein, SD6 is the effective half-aperture of the sixth lens, and AC5 is the air gap between the fifth and sixth lenses on the optical axis.

6. An optical imaging lens as described in claim 1, characterized in that, The optical imaging lens satisfies the following condition: 1.5 <ALT / AAG<2.5 Wherein, ALT is the sum of the center thicknesses of the first to sixth lenses along the optical axis, and AAG is the sum of the air gaps of the first to sixth lenses along the optical axis.

7. An optical imaging lens as described in claim 1, characterized in that, The optical imaging lens satisfies the following condition: 2.4 <f / BFL<3.7 Where f is the overall focal length of the lens, and BFL is the distance on the optical axis from the sixth lens to the image plane.

8. An optical imaging lens as described in claim 1, characterized in that, Two of the first, second, third, fourth, fifth, and sixth lenses are glass spherical lenses, and the other four lenses are plastic aspherical lenses.

Images