Optical imaging lens and imaging equipment

Abstract

The invention provides an optical imaging lens and imaging equipment, and belongs to the technical field of optical imaging. The optical imaging lens comprises a first lens with negative focal power, a second lens with positive focal power, a diaphragm, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power and an eighth lens with negative focal power which are sequentially arranged in the direction of an optical axis. The image side surface of the first lens is a concave surface, the Abbe number of the fourth lens is greater than that of the third lens, the object side surface and the image side surface of the fifth lens are rotationally symmetrical aspheric surfaces, the object side surface of the sixth lens is a concave surface, and the Abbe number of the seventh lens is greater than that of the sixth lens; the object side surface and the image side surface of the eighth lens are rotationally symmetrical aspheric surfaces and are respectively a concave surface and a convex surface, and the optical imaging lens meets set optical parameter conditions. According to the invention, the requirements of miniaturization, large wide angle, large aperture and high imaging quality can be met.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to an optical imaging lens and an imaging device. Background Art

[0002] The APSC (Advanced Photo System Type-C) format camera has a compact body design, small size and light weight, making it easy to carry and very suitable for daily photography and travel photography.

[0003] At the same time, because the wide-angle pancake lens has the characteristics of small size and wide viewing angle, it is very suitable for use with APSC format cameras when shooting scenes with a large field of view within a limited distance.

[0004] Although the thickness of wide-angle biscuit lenses is relatively small, in order to achieve the ultimate compression thickness, wide-angle biscuit lenses often use a relatively simple optical structure with a small number of lenses. This makes the wide-angle biscuit lenses limited in their ability to refract and focus light, and they cannot accurately restore the details and textures of objects like some lenses with complex optical structures, resulting in insufficient resolution. In addition, wide-angle biscuit lenses themselves have large distortion problems, especially barrel distortion. Moreover, due to the small thickness and limited internal space of wide-angle biscuit lenses, it is difficult to install complex optical correction elements to effectively correct distortion, which makes it difficult to obtain good distortion control effects in actual use. In this way, the interrelationship between the two problems of insufficient resolution and large distortion leads to the low quality of the actual shots taken by wide-angle biscuit lenses, such as loss of details in the picture, blurred edges, and distortion, making it difficult for the photos or videos taken to reach a high level in quality and unable to meet the needs of users with high requirements for image quality. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide an optical imaging lens and an imaging device, aiming to meet the requirements of miniaturization, wide angle, large aperture and high imaging quality.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides an optical imaging lens, comprising a front lens group with negative focal power, an aperture, and a rear lens group with positive focal power arranged in sequence along an optical axis, the front lens group comprising a first lens with negative focal power and a second lens with positive focal power arranged in sequence along the optical axis, the image side surface of the first lens being a concave surface, the rear lens group comprising a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, and a ninth lens with positive focal power arranged in sequence along the positive direction of the optical axis, the Abbe number of the fourth lens being greater than the Abbe number of the third lens, the object side surface and the image side surface of the fifth lens being both rotationally symmetric aspherical surfaces, the object side surface of the sixth lens being a concave surface, the Abbe number of the seventh lens being greater than the Abbe number of the sixth lens, the object side surface and the image side surface of the eighth lens being both rotationally symmetric aspherical surfaces, the object side surface of the eighth lens being a concave surface, and the image side surface of the eighth lens being a convex surface;

[0008] The optical imaging lens meets the following optical parameter conditions:

[0009]

[0010] Wherein, TTL is the total optical length of the optical imaging lens, and Y is the maximum image plane radius height.

[0011] In addition, the optical imaging lens according to the present invention may also have the following additional technical features:

[0012] Furthermore, the optical imaging lens also meets the following optical parameter conditions:

[0013]

[0014] Wherein, OAL is the distance from the object side surface of the first lens to the image side surface of the ninth lens on the optical axis.

[0015] Furthermore, the optical imaging lens also meets the following optical parameter conditions:

[0016]

[0017] Wherein, CT23 is the air gap between the second lens and the third lens on the optical axis.

[0018] Furthermore, the optical imaging lens also meets the following optical parameter conditions:

[0019]

[0020] Wherein, CTT is the sum of the air gaps between the first lens to the ninth lens on the optical axis.

[0021] Furthermore, the front lens group satisfies the following optical parameter conditions:

[0022]

[0023] Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0024] Furthermore, the rear lens group satisfies the following optical parameter conditions:

[0025]

[0026] Wherein, f5 is the effective focal length of the fifth lens, and f8 is the effective focal length of the eighth lens.

[0027] Furthermore, the rear lens group also satisfies the following optical parameter conditions:

[0028]

[0029] Wherein, R82 is the radius of curvature at the vertex of the image side surface of the eighth lens, and f is the total effective focal length of the optical imaging lens.

[0030] Further, the third lens and the fourth lens are combined into a doublet lens, and / or the sixth lens and the seventh lens are combined into a doublet lens, and the rear lens group also satisfies the following optical parameter conditions:

[0031]

[0032] Among them, f34 is the combined effective focal length of the third lens image and the fourth lens, and f67 is the combined effective focal length of the sixth lens image and the seventh lens.

[0033] Furthermore, TTL satisfies 35 mm ≤ TTL ≤ 45 mm.

[0034] In a second aspect, the present invention further provides an imaging device, comprising the aforementioned optical imaging lens and an imaging element, wherein the imaging element is located at the image plane of the optical imaging lens.

[0035] The beneficial effects of the present invention include at least: the combination of the front lens group with negative focal power before and after the aperture and the rear lens group with positive focal power constitutes a typical reverse telephoto architecture, which solves the problem of insufficient rear working distance in the design of wide-angle lenses and improves aberration correction and imaging quality; at the same time, in the specific structure, the first lens with negative focal power can quickly shrink the wide-angle light into a small field of view light, which is beneficial to reduce the optical distortion at the edge of the field of view and provide a solution for a small front aperture, and the second lens with positive focal power cooperates with the first lens to form a positive and negative combination of focal power, which can reduce the position difference of light of different colors during imaging, thereby helping to reduce chromatic aberration and spherical aberration, the third lens with negative focal power can compress the light height, especially the light height at the edge of the central field of view, which is beneficial to reduce the assembly sensitivity of the third lens, and the high and low Abbe number combination of the fourth lens with positive focal power and the third lens with negative focal power can make light of different wavelengths better focused on the imaging surface, so as to be able to well The axial chromatic aberration and spherical aberration can be corrected effectively. The fifth lens with positive optical power can optimize spherical aberration and field curvature through the setting of aspherical surface, and can improve shooting clarity without increasing the number of lenses. The sixth lens with negative optical power sets the object side as a concave surface, which can smoothly connect the refracted light of the fifth lens and reduce the tolerance sensitivity. The seventh lens with positive optical power forms a positive and negative combination of optical power with the sixth lens, which can reduce the chromatic aberration of the whole system. The eighth lens with negative optical power can quickly diffuse the light through the setting of aspherical surface. At the same time, the double-sided shape of the eighth lens is symmetrically combined with the double-sided shape of the first lens to a certain extent. In this way, with the help of aspherical surface, the optical distortion can be further reduced, so that almost no in-camera correction is required for shooting under wide-angle characteristics, reducing the number or size of lenses, thereby realizing a more compact optical system. The ninth lens with positive optical power can smoothly lift the light and lower the incident angle of the light to the image plane, so that it can match a variety of APSC format cameras and reduce the overall sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic structural diagram of an optical imaging lens in Embodiment 1 of the present invention;

[0037] Figure 2 A longitudinal spherical aberration diagram, a field curvature diagram, and a distortion diagram of the optical imaging lens according to Example 1 of the present invention;

[0038] Figure 3 is a schematic structural diagram of an optical imaging lens in Embodiment 2 of the present invention;

[0039] Figure 4 A longitudinal spherical aberration diagram, a field curvature diagram, and a distortion diagram of the optical imaging lens according to Example 2 of the present invention;

[0040] Figure 5is a schematic structural diagram of an optical imaging lens in Embodiment 3 of the present invention;

[0041] Figure 6 A longitudinal spherical aberration diagram, a field curvature diagram, and a distortion diagram of the optical imaging lens according to Example 3 of the present invention;

[0042] Figure 7 is a schematic structural diagram of an optical imaging lens in Embodiment 4 of the present invention;

[0043] Figure 8 A longitudinal spherical aberration diagram, a field curvature diagram, and a distortion diagram of the optical imaging lens according to Example 4 of the present invention;

[0044] Fig. 9 is a schematic structural diagram of an optical imaging lens in Embodiment 5 of the present invention;

[0045] Fig.10 Graphs showing longitudinal spherical aberration, field curvature and distortion of the optical imaging lens according to Embodiment 5 of the present invention;

[0046] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0047] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0048] It should be noted that in this specification, the expressions first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0049] In the drawings of the present application, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0050] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0051] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising" herein, when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplarily" is intended to refer to an example or illustration.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0053] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] The features, principles and other aspects of the present application are described in detail below.

[0055] Please refer to Figure 1 , Figure 3 , Figure 5 , Figure 7 , Fig. 9 , an optical imaging lens provided by the present invention, comprises a front lens group with negative optical focal length, an aperture STO and a rear lens group with positive optical focal length which are arranged in sequence along the optical axis.

[0056] Among them, the front lens group includes a first lens L1 with negative optical power and a second lens L2 with positive optical power arranged in sequence along the optical axis. The image side surface of the first lens L1 is a concave surface. In order to achieve the negative optical power of the first lens L1, the first lens L1 can be a plano-concave lens, a bi-concave lens, or a convex-concave lens. The rear lens group includes a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, an eighth lens L8 with negative optical power and a ninth lens L9 with positive optical power, which are arranged in sequence along the positive direction of the optical axis. The Abbe number of the fourth lens L4 is greater than the Abbe number of the third lens L3. The object side surface and the image side surface of the fifth lens L5 are both rotationally symmetric aspherical surfaces. The object side surface of the sixth lens L6 is concave. The Abbe number of the seventh lens L7 is greater than the Abbe number of the sixth lens L6. The object side surface and the image side surface of the eighth lens L8 are both rotationally symmetric aspherical surfaces. The object side surface of the eighth lens L8 is concave, and the image side surface of the eighth lens L8 is convex.

[0057] In addition, the optical imaging lens provided in this application also meets the following optical parameter conditions:

[0058]

[0059] Wherein, TTL is the total optical length of the optical imaging lens, and Y is the maximum image plane radius height.

[0060] Exemplarily, the value of TTL / Y can be 2.61, 2.65, 2.7, 2.97, and 2.8. When the optical imaging lens provided in the present application satisfies the above conditional formula, the optical imaging lens has strong overall compactness and miniaturization characteristics, which is helpful to further develop a biscuit-type lens that is light in weight, small in size, and easy to use. It should be noted that when the value of TTL / Y exceeds the upper limit of 3.0, the total optical length of the optical imaging lens will be larger, and the miniaturization feature will not be obvious. When the value of TTL / Y exceeds the lower limit of 2.5, the total optical length of the optical imaging lens will be smaller, and the internal space of the lens will increase the processing cost and assembly cost due to excessive compression.

[0061] Preferably, the second lens L2 is a meniscus convex lens with the convex surface being the object side surface, which can reduce spherical aberration and overall field curvature, thereby making the MTF concentration of the optical system higher.

[0062] In some optional embodiments, the optical imaging lens further satisfies the following optical parameter conditions:

[0063]

[0064] Wherein, OAL is the distance on the optical axis from the object side surface of the first lens L1 to the image side surface of the ninth lens L9.

[0065] Exemplarily, the values ​​of TTL / OAL can be 1.48, 1.5, 1.52, 1.54, and 1.6. When the optical imaging lens provided in the present application satisfies the above conditional formula, the ratio of the total physical length of the optical imaging lens to the total optical length is in a suitable range, thereby improving the compactness of the interior of the lens, ensuring that the internal space of the lens can be fully utilized, reducing the total thickness of the finished lens, and improving the portability of the lens. It should be noted that when the value of TTL / OAL exceeds the upper limit of 1.62, the total physical length of the lens accounts for a small proportion, the internal space of the lens is extremely compressed, and the choice of internal lens shape, material, and processability is reduced, which is not conducive to cost control and the design difficulty is greater. When the value of TTL / OAL exceeds the lower limit of 1.45, the total physical length of the lens accounts for a large proportion, and the internal space of the lens is large, which cannot meet the needs of miniaturization of wide-angle biscuit lenses.

[0066] In some optional embodiments, the optical imaging lens further satisfies the following optical parameter conditions:

[0067]

[0068] Wherein, CT23 is the air gap between the second lens L2 and the third lens L3 on the optical axis.

[0069] Exemplarily, the value of CT23 / OAL can be 0.11, 0.13, 0.137, 0.14, 0.15. When the optical imaging lens provided by the present application satisfies the above conditional formula, the air gap between the second lens L2 and the third lens L3 is appropriately proportional to the total physical length of the lens, so that there is enough space between the second lens L2 and the third lens L3 to place the aperture STO, for example, to place an electric aperture, and to achieve a wide range of aperture size adjustment, such as an adjustable aperture size range of F2 to F16; at the same time, the compactness of the lens interior can be maintained, which helps to reduce the thickness of the lens in the optical axis direction. It should be noted that when the value of CT23 / OAL exceeds the upper limit of 0.16, the gap between the second lens L2 and the third lens L3 is too large, and the internal compactness is insufficient, and when the value of CT23 / OAL exceeds the lower limit of 0.1, the gap between the second lens L2 and the third lens L3 is too small, and it is difficult to simultaneously achieve the purpose of reducing the total physical length of the lens and arranging the aperture STO.

[0070] In some optional embodiments, the optical imaging lens further satisfies the following optical parameter conditions:

[0071]

[0072] Wherein, CTT is the sum of the air gaps between the first lens L1 to the ninth lens L9 on the optical axis.

[0073] Exemplarily, the values ​​of CTT / TTL can be: 0.2, 0.206, 0.21, 0.22, 0.23. When the optical imaging lens provided by the present application satisfies the above conditional formula, the gap between the first lens L1 to the ninth lens L9 is compressed to a reasonable range, which can not only ensure that the internal space of the lens has sufficient utilization, but also ensure that the lens has sufficient layout space, so that there is redundant space for lens material selection and thickness control, which helps to reduce costs and improve product resolution. It should be noted that when the value of CTT / TTL exceeds the upper limit of 0.24, the internal space utilization of the lens is insufficient, and the overall miniaturization feature of the lens is insufficient. When the value of CTT / TTL exceeds the lower limit of 0.2, the internal space of the lens is overly compressed, which will have a greater impact on assembly and adjustment, appearance control, and stray light suppression.

[0074] In some optional embodiments, the front lens group satisfies the following optical parameter conditions:

[0075]

[0076] Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0077] Exemplarily, the value of f1 / f2 can be -0.73, -0.7, -0.64, -0.55, -0.53. When the optical imaging lens provided by the present application satisfies the above conditional formula, the effective focal length ratio of the first lens L1 and the second lens L2 is within a reasonable range, so that the first lens L1 and the second lens L2 in front of the aperture STO have suitable optical focal lengths, and form a combination of positive and negative optical focal lengths, which helps to reduce chromatic aberration, form a complementary relationship, disperse the optical focal length, and evenly distribute the overall tolerance sensitivity. It should be noted that when the value of f1 / f2 exceeds the upper and lower limits, the difference in the effective focal length ratio of the first lens L1 and the second lens L2 is too large, and the optical focal length is overly concentrated on a single lens, resulting in a poor complementary effect and increased tolerance sensitivity, which in turn affects the feasibility and yield of mass production.

[0078] In some optional embodiments, the rear lens group satisfies the following optical parameter conditions:

[0079]

[0080] Wherein, f5 is the effective focal length of the fifth lens L5, and f8 is the effective focal length of the eighth lens L8.

[0081] Exemplarily, the value of f5 / f8 can be -1.66, -1.6, -1.4, -0.6, -0.55. When the optical imaging lens provided by the present application satisfies the above conditional formula, the effective focal length ratio of the fifth lens L5 and the eighth lens L8 is within a reasonable range, and because the fifth lens L5 and the eighth lens L8 are both glass aspherical lenses, the introduction of aberrations can be further reduced, and the smooth curved surface of the fifth lens L5 and the eighth lens L8 can improve the compactness of the lens part. In addition, the glass aspherical lens can bear the optical focal length that is difficult to achieve with a spherical lens, and the surface of the glass aspherical lens is flatter and has better tolerance characteristics. Specifically, the eighth lens L8 can make full use of the aspherical characteristics, so that the optical distortion of the system with wide-angle characteristics can also be maintained at a level that is difficult for the human eye to detect, while reducing the edge chromatic aberration field curvature and improving the overall resolution. It should be noted that when the value of f5 / f8 exceeds the upper and lower limits, the effective focal length ratio of the fifth lens L5 and the eighth lens L8 is too large and too small, and the optical power is easily over-concentrated, making it difficult to achieve aspheric surface processing and tolerance, thereby reducing product yield.

[0082] In some optional embodiments, the rear lens group also satisfies the following optical parameter conditions:

[0083]

[0084] Wherein, R82 is the radius of curvature at the vertex of the image side surface of the eighth lens L8, and f is the total effective focal length of the optical imaging lens.

[0085] Exemplarily, the value of R82 / f can be -0.56, -0.51, -0.5, -0.38, -0.31. When the optical imaging lens provided by the present application satisfies the above conditional formula, the ratio of the image side curvature radius of the eighth lens L8 to the overall effective focal length of the lens is within a reasonable range, which not only maintains the proportion of the optical power of the eighth lens L8 in the entire system, but also avoids the image side curvature radius of the eighth lens L8 being too small, thereby making the surface transition smooth, and the processability and tolerance sensitivity are well guaranteed, and the eighth lens L8 can give full play to the aspheric characteristics, correct aberrations, and improve shooting performance. It should be noted that when the value of R82 / f exceeds the upper limit, the image side curvature radius of the eighth lens L8 is likely to cause transitional curvature of the surface, causing processing difficulties or even leading to processing failures, and when the value of R82 / f exceeds the lower limit, the image side curvature radius of the eighth lens L8 is too large, so that the optical power provided by the eighth lens L8 is too small, and it is difficult to compensate for the aberrations of the peripheral field of view, thereby reducing the image quality performance.

[0086] In some optional embodiments, the third lens image L3 and the fourth lens L4 are combined into a doublet lens, and / or the sixth lens image L6 and the seventh lens L7 are combined into a doublet lens, and the rear lens group further satisfies the following optical parameter conditions:

[0087]

[0088] Among them, f34 is the combined effective focal length of the third lens image L3 and the fourth lens L4, and f67 is the combined effective focal length of the sixth lens image L6 and the seventh lens L7.

[0089] Exemplarily, the value of f34 / f67 can be -0.78, -0.72, -0.69, -0.57, -0.42. When the optical imaging lens provided by the present application satisfies the above conditional formula, the effective focal length ratio of the third lens image L3 and the fourth lens L4 and the effective focal length ratio of the sixth lens image L6 and the seventh lens L7 are within a reasonable range. By utilizing the advantages of the combination of positive and negative optical powers of the two pairs of lenses, the internal space utilization of the lens can be improved, and it has good compensation advantages in spherical aberration, axial chromatic aberration, vertical axis chromatic aberration and field curvature, so that the light transition is smooth, and the tolerance is evenly distributed on each lens to avoid excessive concentration. At the same time, since the sixth lens image L6 and the seventh lens L7 are combined into a double-cemented lens, the internal compactness can be further improved, the tolerance sensitivity can be reduced, and the image quality performance can be improved. It should be noted that when the value of f34 / f67 exceeds the upper and lower limits, the effective focal lengths of the third lens image L3 and the fourth lens image L4 and the effective focal lengths of the sixth lens image L6 and the seventh lens image L7 are far away from the optical power distribution characteristics of the architecture, which can easily cause local optical power concentration, reduce the aberration compensation effect, and affect the overall image quality performance.

[0090] In some optional embodiments, TTL satisfies 35mm≤TTL≤45mm. By controlling the TTL value within the range of 35mm to 45mm, the APSC frame can be matched to obtain a low-cost, compact miniaturized lens device to meet people's needs for portable shooting.

[0091] In a second aspect, the present invention further provides an imaging device, comprising the aforementioned optical imaging lens and an imaging element, wherein the imaging element is located at the image plane of the optical imaging lens.

[0092] The following will be combined Figures 1 to 10 Some specific but non-limiting examples of the embodiments of the present application are described in more detail.

[0093] It should be noted that the embodiments of the present application do not specifically limit the material of each lens.

[0094] Embodiment 1:

[0095] like Figure 1As shown, an optical imaging lens provided by the present invention, in this embodiment, the optical imaging lens includes a first lens L1 with negative optical power, a second lens L2 with positive optical power, an aperture STO, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, an eighth lens L8 with negative optical power, a ninth lens L9 with positive optical power and a protective glass CG, which are sequentially arranged along the optical axis direction.

[0096] In terms of structure, the third lens L3 and the fourth lens L4 form a doublet lens, and the sixth lens L6 and the seventh lens L7 form a doublet lens.

[0097] In terms of optical parameters, the total effective focal length of the optical imaging lens is f=18.63 mm, the aperture F value F.No=2.03, the maximum field of view FOV=79°, and the distance OAL from the object side of the first lens L1 to the image side of the ninth lens L9 on the optical axis is 26.6 mm.

[0098] Specifically, the specific parameters of each lens in the optical imaging lens in this embodiment are shown in Table 1, where the units of the radius of curvature and thickness are both millimeters (mm):

[0099] Table 1

[0100]

[0101]

[0102] It should be noted that, in this embodiment, the reference wavelength of the effective focal length, the Abbe number, and the refractive index is 546 nm. In Table 1, the cemented surface of the doublet lens composed of the third lens L3 and the fourth lens L4 is regarded as one surface, and the cemented surface of the doublet lens composed of the sixth lens L6 and the seventh lens L7 is also regarded as one surface.

[0103] Specifically, surface number S0 represents an object plane, which represents a plane where an object photographed or imaged by the imaging lens is located; surface numbers S1, S3, S5, S6, S8, S10, S11, S13, S15, and S17 respectively represent object side surfaces of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a cover glass CG; surface numbers S2, S4, S6, S7, S9, S11, S12, S14, S16, and S18 respectively represent image side surfaces of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a cover glass CG; STO represents an aperture stop; and surface number S19 represents an image plane IMA.

[0104] In addition, in this embodiment, the aspherical surfaces of the aspherical lenses (the fifth lens L5 and the eighth lens L8) satisfy the following aspherical surface formula:

[0105]

[0106] Among them, Z is the vector height, c is the reciprocal of the radius of curvature R, y is the radial coordinate, k is the conic quadratic coefficient, A4, A6, A8, A10, A12, A14, A16 are the aspheric high-order coefficients, and the specific parameters are shown in Table 2:

[0107] Table 2

[0108] S8 S9 S13 S14 R -512.837 -12.4699 -7.00751 -9.5 K 0 -8.24839 -0.57677 -9.54702 A4 1.92E-04 -4.64E-04 2.46E-04 -8.52E-04 A6 2.46E-06 1.08E-05 1.74E-06 4.53E-05 A8 -5.50E-08 -2.34E-07 3.56E-07 -1.14E-06 A10 1.42E-09 5.09E-09 -9.76E-09 2.53E-08 A12 -6.76E-12 -4.85E-11 -2.44E-10 -4.51E-10 A14 0.00E+00 0 1.13E-11 4.95E-12 A16 0 0 -1.22E-13 -2.37E-14

[0109] It can be understood that the aspheric surface of each aspheric lens in the optical imaging lens in this embodiment can use the aspheric surface constrained by the above aspheric surface formula, or can use the aspheric surface constrained by other aspheric surface formulas, and this application does not limit it.

[0110] Figure 2 The optical performance of the optical imaging lens designed in the lens combination mode of the first embodiment is described. Specifically, Figure 2 1 and 1, from left to right, respectively include a longitudinal spherical aberration diagram (LONGITUDINALSPHERICAL ABER.) of the optical imaging lens in Example 1, a field curvature diagram (ASTIGMATIC FIELD CURVES) of the optical imaging lens in Example 1, and a distortion diagram (DISTORTION) of the optical imaging lens in Example 1.

[0111] Among them, the longitudinal spherical aberration diagram is a graph used to represent the deviation of the convergent focus of light of different wavelengths in the optical system after passing through the optical imaging lens. The field curvature diagram represents the degree of bending of the light on the meridian image plane and sagittal image plane of the optical imaging lens. The distortion diagram represents the degree of distortion of the light at different image heights on the image plane.

[0112] In the longitudinal spherical aberration diagram, the ordinate represents the normalized pupil coordinate from the pupil center to the pupil edge, and the abscissa represents the distance from the image plane to the intersection of the light and the optical axis (in mm). It can be seen from the longitudinal spherical aberration diagram that the degree of deviation of the convergence focus of each wavelength of light in this embodiment tends to be consistent and is within 0.1 mm, indicating that the diffuse spots or color halos in the imaging picture are effectively suppressed.

[0113] In the field curvature diagram, the horizontal axis represents the offset (in mm), and the vertical axis represents the field angle (in degrees), wherein the S curve represents the sagittal field curvature at a wavelength of 546 nm, and the T curve represents the meridian field curvature at a wavelength of 546 nm. It can be seen from the field curvature diagram that the field curvature of the optical imaging lens in this embodiment is within 0.2 mm, indicating that the field curvature and astigmatism of each field of view are well corrected, so that the center and edge of the field of view can have clear imaging.

[0114] In the distortion diagram, the horizontal axis represents the distortion value (in %), and the vertical axis represents the field of view angle (in degrees). It can be seen from the distortion diagram that the optical distortion is within -2.5%, indicating that the image deformation caused by the main light beam is small, making the imaging quality of the system present an excellent state.

[0115] In summary, the optical lens in this embodiment meets the requirements of miniaturization, wide angle, large aperture and high imaging quality.

[0116] Embodiment 2:

[0117] like Figure 3 As shown, an optical imaging lens provided by the present invention is different from the first embodiment in that, in this embodiment, in terms of structure, the third lens L3 and the fourth lens L4 form a doublet lens, and in terms of optical parameters, the total effective focal length of the optical imaging lens is f=18.6 mm, the aperture F value F.No=2.04, the maximum field of view FOV=79.9°, and the distance OAL on the optical axis from the object side surface of the first lens L1 to the image side surface of the ninth lens L9 is 27.8 mm.

[0118] Specifically, the specific parameters of each lens in the optical imaging lens in this embodiment are shown in Table 3, where the units of the radius of curvature and thickness are both millimeters (mm):

[0119] Table 3

[0120]

[0121]

[0122] It should be noted that the reference wavelength of the effective focal length, Abbe number and refractive index in this embodiment is 546 nm. In Table 3, the cemented surface of the doublet lens composed of the third lens L3 and the fourth lens L4 is regarded as one surface.

[0123] Specifically, surface number S0 represents an object plane, which represents a plane where an object photographed or imaged by the imaging lens is located; surface numbers S1, S3, S5, S6, S8, S10, S12, S14, S16, and S18 respectively represent object side surfaces of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a protective glass CG; surface numbers S2, S4, S6, S7, S9, S11, S13, S15, S17, and S20 respectively represent image side surfaces of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a protective glass CG; STO represents an aperture; and surface number S20 represents an image plane IMA.

[0124] In addition, in this embodiment, the parameters of the aspherical surfaces of the aspherical lenses (the fifth lens L5 and the eighth lens L8) are shown in Table 4:

[0125] Table 4

[0126] S8 S9 S14 S15 R 60.70814 -20.3346 -4.72209 -7.14539 K 0 0.316955 -0.93816 -5.3841 A4 -1.53E-05 -3.66E-04 7.90E-04 -6.22E-04 A6 3.03E-06 5.61E-06 1.36E-05 5.96E-05 A8 -1.08E-07 3.82E-08 4.74E-08 -1.63E-06 A10 4.15E-09 -1.13E-09 -3.87E-08 2.32E-08 A12 -6.39E-11 -9.94E-12 1.12E-09 -1.70E-10 A14 0.00E+00 0 -1.07E-11 5.01E-13 A16 0 0 0.00E+00 0.00E+00

[0127] Figure 4 The optical performance of the optical imaging lens designed in the lens combination mode of the second embodiment is described. Specifically, Figure 4 1 and 1, from left to right, respectively include a longitudinal spherical aberration diagram (LONGITUDINALSPHERICAL ABER.) of the optical imaging lens in Example 1, a field curvature diagram (ASTIGMATIC FIELD CURVES) of the optical imaging lens in Example 1, and a distortion diagram (DISTORTION) of the optical imaging lens in Example 1.

[0128] It can be seen from the longitudinal spherical aberration diagram that the degree of deviation of the convergence focus of each wavelength of light in this embodiment tends to be consistent and is within 0.2 mm, indicating that the diffuse spots or color halos in the imaging picture are effectively suppressed.

[0129] It can be seen from the field curvature diagram that the field curvature of the optical imaging lens in this embodiment is within 0.15 mm, indicating that the field curvature and astigmatism of each field of view are well corrected, so that clear imaging can be achieved at the center and edge of the field of view.

[0130] It can be seen from the distortion diagram that the optical distortion is within -3.5%, indicating that the image deformation caused by the main beam is small, making the imaging quality of the system excellent.

[0131] In summary, the optical lens in this embodiment meets the requirements of miniaturization, wide angle, large aperture and high imaging quality.

[0132] Embodiment 3:

[0133] like Figure 5 As shown, an optical imaging lens provided by the present invention is different from the first embodiment in that, in this embodiment, in terms of optical parameters, the total effective focal length f of the optical imaging lens is 18.18 mm, the maximum field of view FOV is 80.2°, and the distance OAL on the optical axis from the object side surface of the first lens L1 to the image side surface of the ninth lens L9 is 26.13 mm.

[0134] Specifically, the specific parameters of each lens in the optical imaging lens in this embodiment are shown in Table 5, where the units of the radius of curvature and thickness are both millimeters (mm):

[0135] Table 5

[0136]

[0137]

[0138] It should be noted that, in this embodiment, the reference wavelength of the effective focal length, the Abbe number and the refractive index is 546 nm. In Table 5, the cemented surface of the doublet lens composed of the third lens L3 and the fourth lens L4 is regarded as one surface, and the cemented surface of the doublet lens composed of the sixth lens L6 and the seventh lens L7 is also regarded as one surface.

[0139] Specifically, surface number S0 represents an object plane, which represents a plane where an object photographed or imaged by the imaging lens is located; surface numbers S1, S3, S5, S6, S8, S10, S11, S13, S15, and S17 respectively represent object side surfaces of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a cover glass CG; surface numbers S2, S4, S6, S7, S9, S11, S12, S14, S16, and S18 respectively represent image side surfaces of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a cover glass CG; STO represents an aperture stop; and surface number S19 represents an image plane IMA.

[0140] In addition, in this embodiment, the parameters of the aspherical surfaces of the aspherical lenses (the fifth lens L5 and the eighth lens L8) are shown in Table 6:

[0141] Table 6

[0142]

[0143]

[0144] It can be understood that the aspheric surface of each aspheric lens in the optical imaging lens in this embodiment can use the aspheric surface constrained by the above aspheric surface formula, or can use the aspheric surface constrained by other aspheric surface formulas, and this application does not limit it.

[0145] Figure 6 The optical performance of the optical imaging lens designed in the lens combination mode of the second embodiment is described. Specifically, Figure 6 1 and 1, from left to right, respectively include a longitudinal spherical aberration diagram (LONGITUDINALSPHERICAL ABER.) of the optical imaging lens in Example 1, a field curvature diagram (ASTIGMATIC FIELD CURVES) of the optical imaging lens in Example 1, and a distortion diagram (DISTORTION) of the optical imaging lens in Example 1.

[0146] It can be seen from the longitudinal spherical aberration diagram that the degree of deviation of the convergence focus of each wavelength of light in this embodiment tends to be consistent and is within 0.2 mm, indicating that the diffuse spots or color halos in the imaging picture are effectively suppressed.

[0147] It can be seen from the field curvature diagram that the field curvature of the optical imaging lens in this embodiment is within 0.3 mm, indicating that the field curvature and astigmatism of each field of view are well corrected, so that clear imaging can be achieved at the center and edge of the field of view.

[0148] It can be seen from the distortion diagram that the optical distortion is within -2.5%, indicating that the image deformation caused by the main beam is small, making the imaging quality of the system excellent.

[0149] In summary, the optical lens in this embodiment meets the requirements of miniaturization, wide angle, large aperture and high imaging quality.

[0150] Embodiment 4:

[0151] like Figure 7 As shown, an optical imaging lens provided by the present invention is different from the first embodiment in that, in this embodiment, in terms of structure, the third lens L3 and the fourth lens L4 form a doublet lens, and in terms of optical parameters, the total effective focal length of the optical imaging lens is f=18.69 mm, the aperture F value F.No=2.04, the maximum field of view FOV=78.72°, and the distance OAL on the optical axis from the object side surface of the first lens L1 to the image side surface of the ninth lens L9 is 23.31 mm.

[0152] Specifically, the specific parameters of each lens in the optical imaging lens in this embodiment are shown in Table 7, where the units of the radius of curvature and thickness are both millimeters (mm):

[0153] Table 7

[0154] Surface number Surface type Curvature radius (mm) Thickness(mm) Refractive Index Abbe number S0 Spherical unlimited 7000.00 S1 Spherical -256.19 0.90 1.60 38.00 S2 Spherical 10.59 1.23 S3 Spherical 16.02 2.12 2.00 28.30 S4 Spherical 48.43 2.90 STO Spherical unlimited 0.72 S5 Spherical 24.50 0.70 1.70 30.00 S6 Spherical 8.19 3.29 1.88 39.20 S7 Spherical -32.63 0.14 S8 Aspheric -130.72 2.87 1.50 81.50 S9 Aspheric -18.77 0.18 S10 Spherical -20.98 0.70 1.74 27.80 S11 Spherical 17.59 0.57 S12 Spherical 30.52 1.95 1.60 68.30 S13 Spherical -25.31 2.51 S14 Aspheric -4.11 1.39 1.85 40.50 S15 Aspheric -5.82 0.10 S16 Spherical 96.30 4.03 1.88 39.20 S17 Spherical -28.27 10.06 S18 Spherical unlimited 2.50 1.52 64.20 S19 Spherical unlimited 0.10 S20 Spherical unlimited 0.00

[0155] It should be noted that, in this embodiment, the reference wavelength of the effective focal length, the Abbe number and the refractive index is 546 nm. In Table 7, the cemented surface of the doublet lens composed of the third lens L3 and the fourth lens L4 is regarded as one surface.

[0156] Specifically, surface number S0 represents an object plane, which represents a plane where an object photographed or imaged by the imaging lens is located; surface numbers S1, S3, S5, S6, S8, S10, S12, S14, S16, and S18 respectively represent object side surfaces of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a protective glass CG; surface numbers S2, S4, S6, S7, S9, S11, S13, S15, S17, and S20 respectively represent image side surfaces of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a protective glass CG; STO represents an aperture; and surface number S20 represents an image plane IMA.

[0157] In addition, in this embodiment, the parameters of the aspherical surfaces of the aspherical lenses (the fifth lens L5 and the eighth lens L8) are shown in Table 8:

[0158] Table 8

[0159] S8 S9 S14 S15 R -130.72 -18.7678 -4.11124 -5.8169 K 0 8.136301 -1.11468 -4.39865 A4 -3.39E-04 -5.21E-04 3.21E-04 -1.42E-03 A6 -6.78E-07 5.87E-06 7.43E-05 1.19E-04 A8 -1.41E-07 2.60E-07 -1.70E-06 -3.23E-06 A10 4.90E-09 -1.16E-08 -4.30E-08 4.35E-08 A12 -1.24E-10 1.88E-10 2.10E-09 -2.71E-10 A14 0 0 -2.33E-11 4.68E-13 A16 0 0 0 0

[0160] Figure 8 The optical performance of the optical imaging lens designed in the lens combination mode of the fourth embodiment is described. Specifically, Figure 8 1 and 1, from left to right, respectively include a longitudinal spherical aberration diagram (LONGITUDINALSPHERICAL ABER.) of the optical imaging lens in Example 1, a field curvature diagram (ASTIGMATIC FIELD CURVES) of the optical imaging lens in Example 1, and a distortion diagram (DISTORTION) of the optical imaging lens in Example 1.

[0161] It can be seen from the longitudinal spherical aberration diagram that the degree of deviation of the convergence focus of each wavelength of light in this embodiment tends to be consistent and is within 0.2 mm, indicating that the diffuse spots or color halos in the imaging picture are effectively suppressed.

[0162] It can be seen from the field curvature diagram that the field curvature of the optical imaging lens in this embodiment is within 0.2 mm, indicating that the field curvature and astigmatism of each field of view are well corrected, so that clear imaging can be achieved at the center and edge of the field of view.

[0163] It can be seen from the distortion diagram that the optical distortion is within -2.5%, indicating that the image deformation caused by the main beam is small, making the imaging quality of the system excellent.

[0164] In summary, the optical lens in this embodiment meets the requirements of miniaturization, wide angle, large aperture and high imaging quality.

[0165] Embodiment 5:

[0166] like Fig. 9 As shown, an optical imaging lens provided by the present invention is different from the first embodiment in that, in this embodiment, in terms of optical parameters, the total effective focal length of the optical imaging lens is f=18.6 mm, the aperture F value F.No=2.01, and the distance OAL on the optical axis from the object side surface of the first lens L1 to the image side surface of the ninth lens L9 is 25.75 mm.

[0167] Specifically, the specific parameters of each lens in the optical imaging lens in this embodiment are shown in Table 9, where the units of the radius of curvature and thickness are both millimeters (mm):

[0168] Table 9

[0169] Surface number Surface type Curvature radius (mm) Thickness(mm) Refractive Index Abbe number S0 Spherical unlimited 5000.00 S1 Spherical -101.57 0.90 1.50 66.00 S2 Spherical 8.53 1.62 S3 Spherical 18.41 1.81 1.83 42.70 S4 Spherical 75.86 1.43 STO Spherical unlimited 2.02 S5 Spherical 16.71 0.70 1.85 23.70 S6 Spherical 9.68 3.41 1.88 39.20 S7 Spherical -58.25 0.09 S8 Aspheric 121.51 3.35 1.50 81.50 S9 Aspheric -12.69 0.12 S10 Spherical -14.51 0.70 1.69 31.10 S11 Spherical 17.48 1.70 1.83 42.70 S12 Spherical 118.58 2.79 S13 Aspheric -7.38 2.10 1.85 40.50 S14 Aspheric -10.40 0.10 S15 Spherical 66.86 2.91 1.83 42.70 S16 Spherical -55.19 11.24 S17 Spherical unlimited 2.50 1.52 64.20 S18 Spherical unlimited 0.10 S19 Spherical unlimited 0.00

[0170] It should be noted that, in this embodiment, the reference wavelength of the effective focal length, the Abbe number and the refractive index is 546 nm. In Table 9, the cemented surface of the doublet lens composed of the third lens L3 and the fourth lens L4 is regarded as one surface, and the cemented surface of the doublet lens composed of the sixth lens L6 and the seventh lens L7 is also regarded as one surface.

[0171] Specifically, surface number S0 represents an object plane, which represents a plane where an object photographed or imaged by the imaging lens is located; surface numbers S1, S3, S5, S6, S8, S10, S11, S13, S15, and S17 respectively represent object side surfaces of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a cover glass CG; surface numbers S2, S4, S6, S7, S9, S11, S12, S14, S16, and S18 respectively represent image side surfaces of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a cover glass CG; STO represents an aperture stop; and surface number S19 represents an image plane IMA.

[0172] In addition, in this embodiment, the parameters of the aspherical surfaces of the aspherical lenses (the fifth lens L5 and the eighth lens L8) are shown in Table 10:

[0173] Table 10

[0174] S8 S9 S13 S14 R 121.5106 -12.687 -7.37744 -10.3995 K 0 -7.9278 -0.51159 -11.4306 A4 1.81E-04 -4.63E-04 2.14E-04 -8.03E-04 A6 2.30E-06 1.02E-05 3.79E-06 4.25E-05 A8 -6.69E-08 -2.20E-07 2.85E-07 -1.12E-06 A10 2.78E-09 5.98E-09 -1.06E-08 2.59E-08 A12 -3.50E-11 -7.75E-11 -1.97E-10 -4.56E-10 A14 0 0 1.19E-11 4.81E-12 A16 0 0 -1.51E-13 -2.23E-14

[0175] Fig.10 The optical performance of the optical imaging lens designed in the lens combination mode of the fourth embodiment is described. Specifically, Fig.10 1 and 1, from left to right, respectively include a longitudinal spherical aberration diagram (LONGITUDINALSPHERICAL ABER.) of the optical imaging lens in Example 1, a field curvature diagram (ASTIGMATIC FIELD CURVES) of the optical imaging lens in Example 1, and a distortion diagram (DISTORTION) of the optical imaging lens in Example 1.

[0176] It can be seen from the longitudinal spherical aberration diagram that the degree of deviation of the convergence focus of each wavelength of light in this embodiment tends to be consistent and is within 0.2 mm, indicating that the diffuse spots or color halos in the imaging picture are effectively suppressed.

[0177] It can be seen from the field curvature diagram that the field curvature of the optical imaging lens in this embodiment is within 0.25 mm, indicating that the field curvature and astigmatism of each field of view are well corrected, so that clear imaging can be achieved at the center and edge of the field of view.

[0178] It can be seen from the distortion diagram that the optical distortion is within -2.5%, indicating that the image deformation caused by the main beam is small, making the imaging quality of the system excellent.

[0179] In summary, the optical lens in this embodiment meets the requirements of miniaturization, wide angle, large aperture and high imaging quality.

[0180] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0181] The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An optical imaging lens, characterized in that: The optical imaging lens comprises a front lens group with negative focal power, an aperture, and a rear lens group with positive focal power, which are sequentially arranged along the optical axis; The front lens group comprises a first lens with negative optical power and a second lens with positive optical power arranged in sequence along the optical axis, and the image side surface of the first lens is a concave surface; The rear lens group comprises a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power and a ninth lens with positive optical power, which are sequentially arranged along the positive direction of the optical axis; the Abbe number of the fourth lens is greater than the Abbe number of the third lens; the object side surface and the image side surface of the fifth lens are both rotationally symmetric aspherical surfaces; the object side surface of the sixth lens is a concave surface; the Abbe number of the seventh lens is greater than the Abbe number of the sixth lens; the object side surface and the image side surface of the eighth lens are both rotationally symmetric aspherical surfaces, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface; The optical imaging lens meets the following optical parameter conditions: Wherein, TTL is the total optical length of the optical imaging lens, and Y is the maximum image plane radius height.

2. The optical imaging lens according to claim 1, wherein: The optical imaging lens also meets the following optical parameter conditions: Wherein, OAL is the distance from the object side surface of the first lens to the image side surface of the ninth lens on the optical axis.

3. The optical imaging lens according to claim 2, wherein: The optical imaging lens also meets the following optical parameter conditions: Wherein, CT23 is the air gap between the second lens and the third lens on the optical axis.

4. The optical imaging lens according to claim 1, wherein: The optical imaging lens also meets the following optical parameter conditions: Wherein, CTT is the sum of the air gaps between the first lens to the ninth lens on the optical axis.

5. The optical imaging lens according to claim 1, wherein: The front lens group meets the following optical parameter conditions: Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

6. The optical imaging lens according to claim 1, wherein: The rear lens group meets the following optical parameter conditions: Wherein, f5 is the effective focal length of the fifth lens, and f8 is the effective focal length of the eighth lens.

7. The optical imaging lens according to claim 1, wherein: The rear lens group also meets the following optical parameter conditions: Wherein, R82 is the radius of curvature at the vertex of the image side surface of the eighth lens, and f is the total effective focal length of the optical imaging lens.

8. The optical imaging lens according to claim 1, wherein: The third lens and the fourth lens are combined into a doublet lens, and / or the sixth lens and the seventh lens are combined into a doublet lens, and the rear lens group also satisfies the following optical parameter conditions: Among them, f34 is the combined effective focal length of the third lens image and the fourth lens, and f67 is the combined effective focal length of the sixth lens image and the seventh lens.

9. The optical imaging lens according to any one of claims 1 to 8, characterized in that: TTL satisfies 35mm≤TTL≤45mm.

10. An imaging device, characterized in that: The optical imaging lens and the imaging element as claimed in any one of claims 1 to 9 are included, wherein the imaging element is located at the image plane of the optical imaging lens.

Images