Optical imaging lens and imaging equipment

Abstract

The utility model provides an optical imaging lens and imaging equipment, and belongs to the technical field of optical imaging. The 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, an eighth lens with negative focal power and a ninth lens with positive focal power which are sequentially arranged in the direction of an optical axis. The object side surface and the image side surface of the fifth lens are both rotational symmetric aspheric surfaces; the object side surface of the sixth lens is a concave surface; 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 both rotational symmetric aspheric surfaces; the optical imaging lens has a concave surface and a convex surface, and satisfies set optical parameter conditions. According to the utility model, the requirements of miniaturization, large wide angle, large aperture and high imaging quality can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical imaging technical field, especially optical imaging lens and imaging equipment. BACKGROUND

[0002] The APSC (Advanced Photo System Type-C) format camera is compact in design, small in size and weight, convenient to carry, and very suitable for daily photography and travel photography.

[0003] At the same time, the wide-angle pancake lens is small in size and wide in angle of view, and is very suitable for being matched with the APSC format camera for shooting a large field of view within a limited distance.

[0004] Although the wide-angle pancake lens is relatively small in thickness, in order to realize extreme compression thickness, the wide-angle pancake lens often adopts a relatively simple optical structure with a small number of lenses, which limits the refraction and focusing ability of the wide-angle pancake lens, and the wide-angle pancake lens cannot accurately restore the details and textures of the object like some lenses with complex optical structures, thereby resulting in insufficient resolving power. In addition, the wide-angle pancake lens itself also has a large distortion problem, especially barrel distortion, and because the wide-angle pancake lens is small in thickness and has a limited internal space, it is difficult to install complex optical correction elements to effectively correct the distortion, which makes it difficult to obtain good distortion control effect in actual use. Thus, under the mutual influence of the problems of insufficient resolving power and large distortion, the wide-angle pancake lens has low actual shooting quality, such as loss of details in the picture, edge blur and distortion, which makes the photographed photos or videos difficult to reach a high level in quality and unable to meet the requirements of users who have high requirements for the quality. CONTENT OF THE UTILITY MODEL

[0005] Therefore, the utility model aims to provide an optical imaging lens and an imaging device, which meet the requirements of miniaturization, large wide angle, large aperture and high imaging quality.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a kind of optical imaging lens, including negative focal length's front group lens group, diaphragm and positive focal length's rear group lens group sequentially arranged along optical axis direction, the front group lens group includes negative focal length's first lens and positive focal length's second lens sequentially arranged along optical axis direction, the image side surface of the first lens is concave, the rear group lens group includes negative focal length's third lens, positive focal length's fourth lens, positive focal length's fifth lens, negative focal length's sixth lens, positive focal length's seventh lens, negative focal length's eighth lens and positive focal length's ninth lens sequentially arranged along optical axis positive direction, the Abbe number of the fourth lens is greater than the Abbe number of the third lens, the object side surface and image side surface of the fifth lens are all rotationally symmetrical aspherical surface, the object side surface of the sixth lens is concave, the Abbe number of the seventh lens is greater than the Abbe number of the sixth lens, the object side surface and image side surface of the eighth lens are all rotationally symmetrical aspherical surface, and the object side surface of the eighth lens is concave, the image side surface of the eighth lens is convex;

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

[0009]

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

[0011] In addition, the optical imaging lens according to the utility model has the following additional technical features:

[0012] Further, the optical imaging lens also satisfies 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] Further, the optical imaging lens also satisfies the following optical parameter conditions:

[0016]

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

[0018] Further, the optical imaging lens also satisfies the following optical parameter conditions:

[0019]

[0020] Wherein, CTT is the air gap sum from the first lens to the ninth lens on the optical axis.

[0021] Further, the front lens group satisfies the following optical parameter condition:

[0022]

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

[0024] Further, the back lens group satisfies the following optical parameter condition:

[0025]

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

[0027] Further, the back lens group also satisfies the following optical parameter condition:

[0028]

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

[0030] Further, the third lens and the fourth lens are combined into a double cemented lens, and / or the sixth lens and the seventh lens are combined into a double cemented lens, and the back lens group also satisfies the following optical parameter condition:

[0031]

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

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

[0034] In a second aspect, the utility model also provides a kind of imaging equipment, including the optical imaging lens and imaging element of preceding, the imaging element is located at the image surface of the optical imaging lens.

[0035] The beneficial effects of the utility model at least include: the collocation of the front lens group with negative focal length and the rear lens group with positive focal length before and after the diaphragm, which constitutes a typical reverse telephoto framework, solves the problem of insufficient rear working distance in wide-angle lens design, and improves aberration correction and imaging quality; meanwhile, in the specific structure, the first lens with negative focal length can quickly shrink wide-angle light into small field of view light, which is beneficial to reducing optical distortion at the edge of the field of view and providing a solution for a small-diameter front end, the second lens with positive focal length cooperates with the first lens to form a positive and negative collocation combination of focal length, which can reduce the position difference of different colors of light during imaging, thereby helping to reduce chromatic aberration and spherical aberration, the third lens with negative focal length can compress light height, especially the light height at the edge of the central field of view, which is beneficial to reducing the assembly sensitivity of the third lens, the fourth lens with positive focal length and the third lens with negative focal length form a high and low Abbe combination, which can better focus different wavelengths of light on the imaging surface, thereby well correcting axial chromatic aberration and spherical aberration, the fifth lens with positive focal length can optimize spherical aberration and field curvature by the arrangement of the aspheric surface, and can improve the shooting clarity without increasing the number of lenses, the sixth lens with negative focal length is provided with a concave surface on the object side, which can smoothly connect the refracted light of the fifth lens and reduce the tolerance sensitivity, the seventh lens with positive focal length cooperates with the sixth lens to form a positive and negative collocation combination of focal length, which can reduce the chromatic aberration of the whole system, the eighth lens with negative focal length is provided with an aspheric surface, which can quickly diffuse light, and the double surface shape of the eighth lens and the double surface shape of the first lens are symmetrically collocated to some extent, so that the optical distortion can be further reduced under the support of the aspheric surface, the shooting under the wide-angle feature almost does not need in-machine correction, the number of lenses or the size is reduced, and a more compact optical system is realized, and the ninth lens with positive focal length can smoothly lift the light and lower the incident angle of the light to the imaging surface, so that a plurality of APSC format cameras can be matched, and the overall sensitivity is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a structure schematic view of the optical imaging lens in the utility model embodiment 1.

[0037] Figure 2 It is a longitudinal spherical aberration diagram, a field curvature diagram and a distortion diagram of the optical imaging lens of the utility model embodiment 1. Figure 3 It is a structure schematic view of the optical imaging lens in the utility model embodiment 2.

[0038] Figure 4 It is a longitudinal spherical aberration diagram, a field curvature diagram and a distortion diagram of the optical imaging lens of the utility model embodiment 2.

[0039] Figure 5It is a structure schematic view of the optical imaging lens in the embodiment 3 of the utility model;

[0040] Figure 6 It is longitudinal spherical aberration diagram, field curvature diagram and distortion diagram of the optical imaging lens in the embodiment 3 of the utility model;

[0041] Figure 7 It is a structure schematic view of the optical imaging lens in the embodiment 4 of the utility model;

[0042] Figure 8 It is longitudinal spherical aberration diagram, field curvature diagram and distortion diagram of the optical imaging lens in the embodiment 4 of the utility model;

[0043] Figure 9 It is a structure schematic view of the optical imaging lens in the embodiment 5 of the utility model;

[0044] Figure 10 It is longitudinal spherical aberration diagram, field curvature diagram and distortion diagram of the optical imaging lens in the embodiment 5 of the utility model;

[0045] The following detailed description will further illustrate the utility model in combination with the above-mentioned drawings. DETAILED DESCRIPTION

[0046] In order to facilitate understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The drawings show several embodiments of the utility model. However, the utility model can be realized 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 utility model more thorough and comprehensive.

[0047] It should be noted that in the present specification, the first, second, third and the like are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0048] In the drawings of the present application, the thickness, size and shape of the lens have been slightly exaggerated for ease of illustration. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not strictly drawn to scale.

[0049] In the present disclosure, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0050] It should also be understood that the terms "comprise", "comprising", "including", "has", "having" and / or "contain", "containing", when used in this specification, mean the presence of stated features, elements and / or components but do not preclude 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 items, it modifies the entire list of items and not the individual items in the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application herein is only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0052] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] The features, principles and other aspects of the present application are described in detail below.

[0054] Please refer to Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9 , an optical imaging lens provided by the present application comprises a front lens group with negative focal length, a stop STO and a rear lens group with positive focal length arranged in sequence along the optical axis.

[0055] The front lens group comprises, in sequence along the optical axis, a first lens L1 with negative focal power and a second lens L2 with positive focal power, the image side surface of the first lens L1 is a concave surface, and in order to realize the negative focal power of the first lens L1, the first lens L1 can be a plano-concave lens, a double-concave lens or a convex-concave lens. The rear lens group comprises, in sequence along the optical axis, a third lens L3 with negative focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with positive focal power, a sixth lens L6 with negative focal power, a seventh lens L7 with positive focal power, an eighth lens L8 with negative focal power and a ninth lens L9 with positive focal power, 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 symmetrical aspheric surfaces, the object side surface of the sixth lens L6 is a concave surface, 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 symmetrical aspheric surfaces, the object side surface of the eighth lens L8 is a concave surface, and the image side surface of the eighth lens L8 is a convex surface.

[0056] In addition, the optical imaging lens provided in the present application also satisfies the following optical parameter conditions:

[0057]

[0058] wherein TTL is the total optical length of the optical imaging lens, and Y is the maximum image surface radius height.

[0059] Exemplarily, the value of TTL / Y can be 2.61, 2.65, 2.7, 2.97 or 2.8. When the optical imaging lens provided in the present application satisfies the above condition formula, the optical imaging lens has strong overall compactness and small size characteristics, which is helpful to further develop a biscuit lens with light weight, small size and convenient use. It should be noted that when the value of TTL / Y exceeds the upper limit value 3.0, the total optical length of the optical imaging lens will be larger, and the small size characteristic is not obvious, and when the value of TTL / Y exceeds the lower limit value 2.5, the total optical length of the optical imaging lens is smaller, and the internal space of the lens will be compressed too much, which will increase the processing cost and assembly cost.

[0060] Preferably, the second lens L2 is a meniscus convex lens, and the convex surface is the object side surface, which can reduce the spherical aberration, reduce the overall field curvature, and make the MTF of the optical system more concentrated.

[0061] In some optional embodiments, the optical imaging lens also satisfies the following optical parameter conditions:

[0062]

[0063] wherein OAL is the distance between the object side surface of the first lens L1 and the image side surface of the ninth lens L9 along the optical axis.

[0064] Exemplarily, the TTL / OAL can be 1.48, 1.5, 1.52, 1.54, 1.6. When the optical imaging lens provided in the present application satisfies the above condition, the ratio of the physical total length of the optical imaging lens to the total optical length is in a proper range, thereby the compactness of the lens can be improved, the internal space of the lens can be fully utilized, the total thickness of the finished lens is reduced, and the portability of the lens is improved. It should be noted that when the TTL / OAL exceeds the upper limit value 1.62, the ratio of the physical total length of the lens is small, the internal space of the lens is extremely compressed, the selection of the internal lens shape, material and processability is reduced, which is not conducive to cost control and the design is more difficult. When the TTL / OAL exceeds the lower limit value 1.45, the ratio of the physical total length of the lens is large, the internal space of the lens is large, and the demand for miniaturization of the wide-angle cookie lens cannot be met.

[0065] In some optional embodiments, the optical imaging lens further satisfies the following optical parameter condition:

[0066]

[0067] CT23 is the air gap of the second lens L2 to the third lens L3 on the optical axis.

[0068] Exemplarily, the CT23 / OAL can be 0.11, 0.13, 0.137, 0.14, 0.15. When the optical imaging lens provided in the present application satisfies the above condition, the ratio of the air gap between the second lens L2 and the third lens L3 to the physical total length of the lens is appropriate, so that there is enough space between the second lens L2 and the third lens L3 to place the stop STO, for example, to place a motorized aperture, and to realize a large range of aperture size adjustment, such as the aperture size adjustable range is F2~F16; at the same time, the compactness of the lens can be maintained, which helps to reduce the thickness of the lens in the optical axis direction. It should be noted that when the CT23 / OAL exceeds the upper limit value 0.16, the gap between the second lens L2 and the third lens L3 is too large, and the internal compactness is insufficient. When the CT23 / OAL exceeds the lower limit value 0.1, the gap between the second lens L2 and the third lens L3 is too small, and it is difficult to simultaneously realize the purpose of reducing the physical total length of the lens and arranging the stop STO.

[0069] In some optional embodiments, the optical imaging lens further satisfies the following optical parameter condition:

[0070]

[0071] CTT is the sum of the air gaps of the first lens L1 to the ninth lens L9 on the optical axis.

[0072] Exemplarily, the CTT / TTL value can be 0.2, 0.206, 0.21, 0.22, 0.23. When the optical imaging lens provided in the present application satisfies the above condition formula, the gap between the first lens L1 and the ninth lens L9 is compressed to a reasonable range, which can not only guarantee sufficient utilization of the internal space of the lens, but also guarantee sufficient arrangement space of the lens, so that the lens material selection and thickness control have redundant space, which helps to reduce the cost and improve the product resolution. It should be noted that when the CTT / TTL value exceeds the upper limit value 0.24, the internal space utilization of the lens is not enough, and the overall lens miniaturization feature is insufficient, and when the CTT / TTL value exceeds the lower limit value 0.2, the internal space of the lens is compressed too much, which will have a greater impact on assembly, appearance control and stray light suppression.

[0073] In some optional embodiments, the front lens group satisfies the following optical parameter condition:

[0074]

[0075] Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0076] Exemplarily, the f1 / f2 value can be -0.73, -0.7, -0.64, -0.55, -0.53. When the optical imaging lens provided in the present application satisfies the above condition 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 before the stop STO have appropriate optical power, and form a positive and negative optical power combination, which helps to reduce the chromatic spherical aberration, form a complementary relationship, disperse the optical power, and divide the overall tolerance sensitivity. It should be noted that when the f1 / f2 value exceeds the upper and lower limit values, the effective focal length ratio of the first lens L1 and the second lens L2 is too different, and the optical power is too concentrated on a single lens, which causes the complementary effect to be poor, the tolerance sensitivity to increase, and then affects the production feasibility and yield.

[0077] In some optional embodiments, the rear lens group satisfies the following optical parameter condition:

[0078]

[0079] Wherein, f5 is the effective focal length of the fifth lens L5, and f8 is the effective focal length of the eighth lens L8.

[0080] Exemplarily, f5 / f8 can be -1.66, -1.6, -1.4, -0.6, -0.55. When the optical imaging lens provided in the present application satisfies the above condition, the effective focal length ratio of the fifth lens L5 and the eighth lens L8 is within a reasonable range, and since the fifth lens L5 and the eighth lens L8 are both glass aspheric lenses, the introduction of aberration 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 aspheric lens can bear the refractive power that the spherical lens cannot achieve, and the surface of the glass aspheric lens is smoother and the tolerance characteristic is better. Specifically, the eighth lens L8 can make full use of the aspheric feature to keep the system optical distortion with wide-angle characteristics at a level that the human eye cannot 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 limit values, the effective focal length ratio of the fifth lens L5 and the eighth lens L8 is too large and too small, and the refractive power is easy to concentrate too much, making it difficult to achieve aspheric processing and tolerance, and reducing product yield.

[0081] In some optional embodiments, the rear lens group further satisfies the following optical parameter condition:

[0082]

[0083] Wherein, R82 is the curvature radius of the image side vertex of the eighth lens L8, and f is the total effective focal length of the optical imaging lens.

[0084] Exemplarily, R82 / f can be -0.56, -0.51, -0.5, -0.38, -0.31. When the optical imaging lens provided in the present application satisfies the above condition, the curvature radius of the image side of the eighth lens L8 and the total effective focal length of the lens are within a reasonable range, which not only maintains the proportion of the refractive power of the eighth lens L8 in the entire system, but also avoids the curvature radius of the image side of the eighth lens L8 being too small, so that the surface is smoothly transitioned, the processing and tolerance sensitivity are well guaranteed, and the eighth lens L8 can fully play the aspheric feature to correct aberration and improve the shooting performance. It should be noted that when the value of R82 / f exceeds the upper limit value, the curvature radius of the image side of the eighth lens L8 is easy to cause the transition of the surface to bend, causing processing difficulty, and even leading to inability to process, and when the value of R82 / f exceeds the lower limit value, the curvature radius of the image side of the eighth lens L8 is too large, and the refractive power provided by the eighth lens L8 is too small, which is difficult to compensate for the aberration of the peripheral field of view, thereby reducing the image quality performance.

[0085] In some optional embodiments, the third lens L3 and the fourth lens L4 are combined into a doublet lens, and / or the sixth lens L6 and the seventh lens L7 are combined into a doublet lens, and the rear lens group further satisfies the following optical parameter condition:

[0086]

[0087] Wherein, f34 is the combined effective focal length of the third lens L3 and the fourth lens L4, and f67 is the combined effective focal length of the sixth lens L6 and the seventh lens L7.

[0088] Exemplarily, the value of f34 / f67 can be -0.78, -0.72, -0.69, -0.57, -0.42. When the optical imaging lens provided in the present application satisfies the above condition formula, the ratio of the effective focal length of the third lens L3 and the fourth lens L4 and the effective focal length of the sixth lens L6 and the seventh lens L7 is within a reasonable range, and by utilizing the advantages of the positive and negative optical power combination of the two pairs of lenses, the internal space utilization of the lens can be improved, and good compensation advantages in spherical aberration, on-axis chromatic aberration, off-axis chromatic aberration and field curvature are obtained, so that the light transition is smooth, and the tolerance is distributed on each lens, avoiding excessive concentration. At the same time, since the sixth lens L6 and the seventh lens L7 are combined into a double cemented lens, the internal compactness can be further improved, the tolerance sensitivity is reduced, and the image quality performance is improved. It should be noted that when the value of f34 / f67 exceeds the upper and lower limit values, the effective focal length of the third lens L3 and the fourth lens L4 and the effective focal length of the sixth lens L6 and the seventh lens L7 deviate from the architectural optical power distribution characteristics, which is easy to cause local optical power concentration, reduce aberration compensation effect, and affect overall image quality performance.

[0089] In some optional embodiments, TTL satisfies 35mm≤TTL≤45mm, by controlling the value of TTL within the range of 35mm-45mm, the APSC format can be matched, a small-sized lens device with low cost and compact structure is obtained, and the demand of people for portable shooting is met.

[0090] In a second aspect, the utility model also provides an imaging device, including the optical imaging lens and imaging element of foregoing, imaging element is located at the image surface of optical imaging lens.

[0091] Some specific but non-limiting examples of the embodiments of the present application will be described in more detail below. Figures 1 to 10 Some specific but non-limitive examples of the embodiments of the present application will be described in more detail below.

[0092] It should be noted that the embodiments of the present application do not specifically limit the material of each lens.

[0093] Embodiment 1:

[0094] As Figure 1The utility model provides a kind of optical imaging lens, in the embodiment, optical imaging lens includes negative power's first lens L1 and positive power's second lens L2, diaphragm STO, negative power's third lens L3, positive power's fourth lens L4, positive power's fifth lens L5, negative power's sixth lens L6, positive power's seventh lens L7, negative power's eighth lens L8, positive power's ninth lens L9 and protection glass CG, which are sequentially arranged along the optical axis direction.

[0095] In structural aspect, third lens L3 and fourth lens L4 constitute double cemented lens, sixth lens L6 and seventh lens L7 constitute double cemented lens.

[0096] In optical parameter aspect, the total effective focal length f of optical imaging lens is 18.63mm, the aperture F value F.No is 2.03, the maximum field of view angle FOV is 79°, the distance OAL on the optical axis from the object side of first lens L1 to the image side of ninth lens L9 is 26.6mm.

[0097] Specifically, the specific parameters of each lens in the optical imaging lens in the embodiment are shown in Table 1, wherein the units of curvature radius and thickness are millimeters (mm):

[0098] Table 1

[0099] Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Refractive Index Abbe Number S0 Sphere Infinite 5000.00 S1 Sphere -214.18 0.90 1.50 66.00 S2 Sphere 8.46 1.79 S3 Sphere 18.20 1.87 1.83 42.70 S4 Sphere 60.91 2.04 STO Sphere Infinite 1.67 S5 Sphere 16.76 0.70 1.85 23.78 S6 Sphere 9.78 3.52 1.88 39.20 S7 Sphere -42.76 0.18 S8 Asphere -512.84 3.12 1.50 81.50 S9 Asphere -12.47 0.10 S10 Sphere -13.76 1.28 1.69 31.10 S11 Sphere 14.32 1.81 1.83 42.70 S12 Sphere 70.83 2.89 S13 Asphere -7.01 1.45 1.85 40.50 S14 Asphere -9.50 0.10 S15 Sphere 117.59 3.19 1.83 42.70 S16 Sphere -33.91 11.20 S17 Sphere Infinite 2.50 1.52 64.20 S18 Sphere Infinite 0.10 S19 Sphere Infinite 0.00

[0100] It should be noted that the reference wavelength of effective focal length, Abbe number and refractive index in the embodiment is 546nm, in Table 1, the cemented surface of the double cemented lens composed of third lens L3 and fourth lens L4 is regarded as one surface, and the cemented surface of the double cemented lens composed of sixth lens L6 and seventh lens L7 is also regarded as one surface.

[0101] Specifically, the surface number S0 represents the object plane, which represents the plane where the object to be imaged or photographed by the optical imaging lens is located, the surface numbers S1, S3, S5, S6, S8, S10, S11, S13, S15 and S17 respectively represent the object side of first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, ninth lens L9 and protection glass CG, the surface numbers S2, S4, S6, S7, S9, S11, S12, S14, S16 and S18 respectively represent the image side of first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, ninth lens L9 and protection glass CG, STO represents the diaphragm, and the surface number S19 represents the image plane IMA.

[0102] Further, in the present embodiment, the aspheric surface of the aspheric lenses (the fifth lens L5 and the eighth lens L8) satisfies the following aspheric surface formula:

[0103]

[0104] wherein Z is the sag, c is the inverse 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:

[0105] Table 2

[0106] 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

[0107] It can be understood that the aspheric surface of each aspheric lens in the optical imaging lens in the present embodiment can use the aspheric surface constrained by the aspheric surface formula described above, or can use the aspheric surface constrained by other aspheric surface formula, which is not limited in the present application.

[0108] Figure 2 The optical performance of the optical imaging lens designed in the lens combination manner of Embodiment One is described. Specifically, Figure 2 from left to right in the figure include the longitudinal spherical aberration graph of the optical imaging lens in Embodiment One, the astigmatic field curves of the optical imaging lens in Embodiment One, and the distortion graph of the optical imaging lens in Embodiment One.

[0109] The longitudinal spherical aberration graph is a graph for representing the convergence point deviation of light rays of different wavelengths in an optical system after passing through the optical imaging lens, the astigmatic field curves represent the bending degree of light rays on the meridional image surface and the sagittal image surface of the optical imaging lens, and the distortion graph represents the distortion degree of light rays at different image heights on the image surface.

[0110] In the longitudinal spherical aberration graph, the longitudinal coordinate represents the normalized pupil coordinate from the pupil center to the pupil edge, and the transverse coordinate represents the distance (in mm) from the image surface to the intersection point of the light ray and the optical axis. It can be known from the longitudinal spherical aberration graph that the convergence point deviation degrees of the light rays of different wavelengths in the present embodiment tend to be consistent, and are all within 0.1 mm, indicating that the diffraction spot or color fringe in the imaging picture is effectively suppressed.

[0111] In the field curvature graph, the horizontal coordinate represents the offset (unit: mm), and the vertical coordinate represents the field angle (unit: degree), wherein the S curve represents the sagittal field curvature at the wavelength of 546 nm, and the T curve represents the tangential field curvature at the wavelength of 546 nm. It can be known from the field curvature graph that the field curvature of the optical imaging lens in the embodiment is within 0.2 mm, which indicates that the field curvature and the astigmatism of each field of view are well corrected, so that the center and the edge of the field of view can have clear imaging.

[0112] In the distortion graph, the horizontal coordinate represents the distortion value (unit: %), and the vertical coordinate represents the field angle (unit: degree). It can be known from the distortion graph that the optical distortion is within-2.5%, which indicates that the image distortion caused by the main light beam is small, so that the imaging quality of the system is in an excellent state.

[0113] In summary, the optical lens in the embodiment meets the requirements of miniaturization, large wide angle, large aperture and high imaging quality.

[0114] Embodiment 2:

[0115] As shown in Figure 3 The optical imaging lens provided by the utility model is different from that in embodiment one in that, in the embodiment, the third lens L3 and the fourth lens L4 form a double cemented lens in terms of structure, and the total effective focal length f of the optical imaging lens is 18.6 mm, the aperture F value F.No is 2.04, the maximum field of view FOV is 79.9°, and the distance OAL between the object side of the first lens L1 and the image side of the ninth lens L9 on the optical axis is 27.8 mm in terms of optical parameters.

[0116] Specifically, the specific parameters of each lens in the optical imaging lens in the embodiment are shown in Table 3, wherein the units of the curvature radius and the thickness are millimeters (mm):

[0117] Table 3

[0118] Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Refractive Index Abbe Number S0 Sphere Infinite 7000.00 S1 Sphere 215.7598 0.90 1.44 94.50 S2 Sphere 8.053191 2.87 S3 Sphere 25.0579 1.83 2.00 28.30 S4 Sphere 145.7118 2.45 STO Sphere Infinite 0.70 S5 Sphere 22.21515 0.70 1.85 23.78 S6 Sphere 10.53157 3.16 1.88 39.20 S7 Sphere -33.8355 0.10 S8 Asphere 60.70814 2.54 1.50 81.50 S9 Asphere -20.3346 0.10 S10 Sphere -24.8082 0.70 1.76 26.60 S11 Sphere 14.75447 0.51 S12 Sphere 25.91151 1.65 1.44 94.50 S13 Sphere -33.8859 2.51 S14 Asphere -4.72209 1.40 1.85 40.50 S15 Asphere -7.14539 0.10 S16 Sphere 2149.47 5.58 1.88 39.20 S17 Sphere -15.9728 14.00 S18 Sphere Infinite 2.50 1.52 64.20 S19 Sphere Infinite 0.10 S20 Sphere Infinite 0.00

[0119] It should be noted that the effective focal length, the Abbe number and the reference wavelength of the refractive index in the embodiment are all 546 nm, and in Table 3, the cemented surface of the double cemented lens formed by the third lens L3 and the fourth lens L4 is regarded as one surface.

[0120] Specifically, the surface number S0 represents an object plane, the object plane is represented as a plane where an object to be imaged is located, the surface numbers S1, S3, S5, S6, S8, S10, S12, S14, S16, S18 represent object side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9 and the protection glass CG respectively, the surface numbers S2, S4, S6, S7, S9, S11, S13, S15, S17, S20 represent image side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9 and the protection glass CG respectively, STO represents a stop, and the surface number S20 represents an image plane IMA.

[0121] In addition, in the present embodiment, the parameters of the aspheric surfaces of the aspheric lenses (the fifth lens L5 and the eighth lens L8) are shown in Table 4:

[0122] Table 4

[0123] 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

[0124] Figure 4 The optical performance of the optical imaging lens designed in the manner of the lens combination of Embodiment Two is described. Specifically, Figure 4 The longitudinal spherical aberration graph (LONGITUDINAL SPHERICAL ABER.) of the optical imaging lens in Embodiment One, the astigmatic field curves of the optical imaging lens in Embodiment One, and the distortion graph of the optical imaging lens in Embodiment One are sequentially contained from left to right in the figure.

[0125] As can be seen from the longitudinal spherical aberration graph, the convergence of the focus points of the light rays of each wavelength in the present embodiment tends to be consistent, and is within 0.2 mm, indicating that the diffraction spots or color fringes in the imaging picture are effectively inhibited.

[0126] As can be seen from the astigmatic field curves, the astigmatic field curves of the optical imaging lens in the present embodiment are all within 0.15 mm, indicating that the astigmatic field curves and the astigmatism of each field of view are well corrected, so that the center and the edge of the field of view can have clear imaging.

[0127] As can be seen from the distortion graph, the optical distortion is all within -3.5%, indicating that the image distortion caused by the chief ray is small, so that the imaging quality of the system presents an excellent state.

[0128] In summary, the optical lens in the present embodiment meets the requirements of miniaturization, large wide angle, large aperture and high imaging quality.

[0129] Embodiment 3

[0130] As Figure 5 shown, the optical imaging lens provided by the utility model is different from that of embodiment one in that, in the embodiment, 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 between the object side of the first lens L1 and the image side of the ninth lens L9 on the optical axis is 26.13 mm.

[0131] Specifically, the specific parameters of each lens in the optical imaging lens in the embodiment are shown in Table 5, wherein the units of the curvature radius and the thickness are millimeters (mm):

[0132] Table 5

[0133] Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Refractive Index Abbe Number S0 Sphere Infinite 5000.00 S1 Sphere -272.83 0.89 1.48 70.40 S2 Sphere 8.82 1.78 S3 Sphere 18.03 2.08 1.83 42.70 S4 Sphere 122.63 1.96 STO Sphere Infinite 1.38 S5 Sphere 27.70 0.70 1.70 30.00 S6 Sphere 7.36 4.00 1.88 39.20 S7 Sphere -33.61 0.08 S8 Asphere -55.45 2.36 1.50 81.50 S9 Asphere -15.57 0.08 S10 Sphere -19.67 0.70 1.74 27.70 S11 Sphere 15.45 1.67 1.83 42.70 S12 Sphere 85.63 2.85 S13 Asphere -6.55 1.44 1.85 40.50 S14 Asphere -10.15 0.10 S15 Sphere 135.99 4.06 1.83 42.70 S16 Sphere -21.49 10.48 S17 Sphere Infinite 2.50 1.52 64.20 S18 Sphere Infinite 0.10 S19 Sphere Infinite 0.00

[0134] It should be noted that the effective focal length, the Abbe number, and the reference wavelength of the refractive index in the embodiment are all 546 nm, in Table 5, the cemented surface of the double cemented lens composed of the third lens L3 and the fourth lens L4 is regarded as one surface, and the cemented surface of the double cemented lens composed of the sixth lens L6 and the seventh lens L7 is also regarded as one surface.

[0135] Specifically, the surface number S0 represents the object plane, the object plane represents the plane where the object to be imaged or photographed by the optical imaging lens is located, the surface numbers S1, S3, S5, S6, S8, S10, S11, S13, S15, and S17 respectively represent the object side of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, and the protective glass CG, the surface numbers S2, S4, S6, S7, S9, S11, S12, S14, S16, and S18 respectively represent the image side of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, and the protective glass CG, STO represents the diaphragm, and the surface number S19 represents the image plane IMA.

[0136] In addition, in the embodiment, the parameters of the aspheric surface of the aspheric lens (the fifth lens L5 and the eighth lens L8) are shown in Table 6:

[0137] Table 6

[0138] S8 S9 S13 S14 R -55.4522 -15.5734 -6.5501 -10.1489 K 0 -5.99334 -0.65422 -12.5717 A4 3.10E-05 -3.15E-04 3.97E-04 -7.01E-04 A6 6.65E-06 -2.86E-07 6.66E-06 5.22E-05 A8 -9.68E-07 -2.26E-08 -3.95E-07 -1.60E-06 A10 5.40E-08 -1.08E-09 1.72E-08 3.29E-08 A12 -1.83E-09 -7.95E-12 -1.21E-09 -4.72E-10 A14 3.09E-11 0 3.81E-11 4.33E-12 A16 -2.24E-13 0 -4.55E-13 -1.94E-14

[0139] It can be understood that the aspheres of the various aspherical lenses in the optical imaging lens in the embodiment can use aspheres constrained by the aspherical formula described above, or can use aspheres constrained by other aspherical formulas, which are not limited in the present application.

[0140] Figure 6 The optical performance of the optical imaging lens designed in the lens combination manner of embodiment two is described. Figure 6 The longitudinal spherical aberration (LONGITUDINAL SPHERICAL ABER.) of the optical imaging lens in embodiment one, the astigmatic field curves of the optical imaging lens in embodiment one, and the distortion of the optical imaging lens in embodiment one are sequentially contained from left to right in the figure.

[0141] It can be known from the longitudinal spherical aberration figure that the convergence point deviation degrees of the light rays of various wavelengths in the embodiment tend to be consistent, and are all within 0.2 mm, indicating that the diffraction spots or color fringes in the imaging picture are effectively inhibited.

[0142] It can be known from the astigmatic field curves that the astigmatic field curves of the optical imaging lens in the embodiment are all within 0.3 mm, indicating that the astigmatic field curves and the astigmatism of various fields are well corrected, so that the center and the edge of the field of view can have clear imaging.

[0143] It can be known from the distortion figure that the optical distortion is all within-2.5%, indicating that the image deformation caused by the main light beam is small, so that the imaging quality of the system presents an excellent state.

[0144] In summary, the optical lens in the embodiment meets the requirements of miniaturization, large wide angle, large aperture and high imaging quality.

[0145] Embodiment 4:

[0146] As Figure 7 shown, the optical imaging lens provided by the utility model is different from that in embodiment one in that, in the embodiment, in the structure aspect, the third lens L3 and the fourth lens L4 form a double cemented lens, in the optical parameter aspect, the total effective focal length f of the optical imaging lens is 18.69 mm, the aperture F value F.No is 2.04, the maximum field of view angle FOV is 78.72°, and the distance OAL on the optical axis from the object side of the first lens L1 to the image side of the ninth lens L9 is 23.31 mm.

[0147] Specifically, the specific parameters of the various lenses in the optical imaging lens in the embodiment are shown in Table 7, wherein the units of the curvature radius and the thickness are millimeters (mm):

[0148] Table 7

[0149]

[0150]

[0151] It should be noted that the effective focal length, Abbe number, and reference wavelength of the refractive index in the embodiment are all 546 nm, and in Table 7, the cemented surface of the double cemented lens composed of the third lens L3 and the fourth lens L4 is regarded as one surface.

[0152] Specifically, the surface number S0 represents the object plane, which is the plane where the object to be imaged is located; the surface numbers S1, S3, S5, S6, S8, S10, S12, S14, S16, and S18 represent the object side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, and the protective glass CG, respectively; the surface numbers S2, S4, S6, S7, S9, S11, S13, S15, S17, and S20 represent the image side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, and the protective glass CG, respectively; STO represents the stop; and S20 represents the image plane IMA.

[0153] In addition, in the embodiment, the parameters of the aspheric surface of the aspheric lens (the fifth lens L5 and the eighth lens L8) are shown in Table 8:

[0154] Table 8

[0155] 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

[0156] Figure 8 The optical performance of the optical imaging lens designed in the manner of the lens combination of Embodiment Four is described. Specifically, Figure 8 The longitudinal spherical aberration graph (LONGITUDINAL SPHERICAL ABER.) of the optical imaging lens in Embodiment One, the astigmatic field curves of the optical imaging lens in Embodiment One, and the distortion graph (DISTORTION) of the optical imaging lens in Embodiment One are sequentially contained from left to right in the middle.

[0157] As shown in the longitudinal spherical aberration graph, the convergence of the light rays of each wavelength in the embodiment deviates to a consistent degree, and is all within 0.2 mm, indicating that the diffraction spot or color halo in the imaging picture is effectively suppressed.

[0158] From the field curvature diagram, the field curvature of the optical imaging lens in the embodiment is all within 0.2mm, which indicates 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.

[0159] From the distortion diagram, the optical distortion is all within-2.5%, which indicates that the image distortion caused by the main beam is small, so that the imaging quality of the system presents an excellent state.

[0160] In summary, the optical lens in the embodiment meets the requirements of miniaturization, large wide angle, large aperture and high imaging quality.

[0161] Embodiment 5:

[0162] As shown in Figure 9 The optical imaging lens provided by the utility model is different from embodiment one in that, in the embodiment, the total effective focal length f of the optical imaging lens is 18.6mm, the aperture F value F.No is 2.01, and the distance OAL between the object side of the first lens L1 and the image side of the ninth lens L9 on the optical axis is 25.75mm.

[0163] Specifically, the specific parameters of each lens in the optical imaging lens in the embodiment are shown in Table 9, wherein the units of the curvature radius and the thickness are both millimeters (mm):

[0164] Table 9

[0165]

[0166]

[0167] It should be noted that the effective focal length, Abbe number and reference wavelength of the refractive index in the embodiment are all 546nm, in Table 9, the cemented surface of the double cemented lens composed of the third lens L3 and the fourth lens L4 is regarded as one surface, and the cemented surface of the double cemented lens composed of the sixth lens L6 and the seventh lens L7 is also regarded as one surface.

[0168] Specifically, the surface number S0 represents an object plane, the object plane is represented as a plane where an object is located and is imaged by the optical imaging lens, the surface numbers S1, S3, S5, S6, S8, S10, S11, S13, S15, S17 represent object side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9 and the protection glass CG respectively, the surface numbers S2, S4, S6, S7, S9, S11, S12, S14, S16, S18 represent image side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9 and the protection glass CG respectively, STO represents a stop, and the surface number S19 represents an image plane IMA.

[0169] In addition, in the present embodiment, the parameters of the aspheric surfaces of the aspheric lenses (the fifth lens L5 and the eighth lens L8) are shown in Table 10:

[0170] Table 10

[0171] 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

[0172] Figure 10 The optical performance of the optical imaging lens designed in the manner of the lens combination of Embodiment Four is described. Specifically, Figure 10 The longitudinal spherical aberration graph (LONGITUDINAL SPHERICAL ABER.) of the optical imaging lens in Embodiment One, the astigmatic field curves of the optical imaging lens in Embodiment One, and the distortion graph of the optical imaging lens in Embodiment One are sequentially contained from left to right in the figure.

[0173] It can be seen from the longitudinal spherical aberration graph that the deviation degrees of the converging focal points of the light rays of each wavelength in the present embodiment tend to be consistent, and are all within 0.2 mm, indicating that the diffraction spots or color fringes in the imaging picture are effectively inhibited.

[0174] It can be seen from the astigmatic field curves that the astigmatic field curves of the optical imaging lens in the present embodiment are all within 0.25 mm, indicating that the astigmatic field curves and the astigmatism of each field of view are well corrected, so that the center and the edge of the field of view can both have clear imaging.

[0175] It can be seen from the distortion graph that the optical distortion is all within -2.5%, indicating that the image deformation caused by the chief ray is small, so that the imaging quality of the system presents an excellent state.

[0176] In summary, the optical lens in the present embodiment meets the requirements of miniaturization, large wide angle, large aperture and high imaging quality.

[0177] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0178] The above-described embodiments only express several implementation manners of the present application, the description is relatively specific and detailed, but it cannot be understood as the limitation of the protection scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An optical imaging lens, characterized in that, The optical imaging lens includes a front lens group with negative optical power, an aperture, and a rear lens group with positive optical power arranged sequentially along the optical axis. The front lens group includes a first lens with negative optical power and a second lens with positive optical power arranged sequentially along the optical axis, wherein the image side of the first lens is concave. The rear lens group includes 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, arranged sequentially along the positive optical axis. The Abbe number of the fourth lens is greater than that of the third lens. The object-side and image-side surfaces of the fifth lens are both rotationally symmetric aspherical surfaces. The object-side surface of the sixth lens is concave. The Abbe number of the seventh lens is greater than that of the sixth lens. The object-side and image-side surfaces of the eighth lens are both rotationally symmetric aspherical surfaces, and the object-side surface of the eighth lens is concave, while the image-side surface of the eighth lens is convex. The optical imaging lens meets the following optical parameter conditions: Where 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, characterized in that, The optical imaging lens also meets the following optical parameter conditions: Wherein, OAL is the distance on the optical axis from the object side of the first lens to the image side of the ninth lens.

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

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

5. The optical imaging lens according to claim 1, characterized in that, The front lens group satisfies the following optical parameter conditions: Where 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, characterized in that, The rear lens group satisfies 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, characterized in that, The rear lens group also meets the following optical parameter conditions: Wherein, R82 is the radius of curvature at the vertex of the side 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, characterized in that, The third lens and the fourth lens are combined to form a cemented doublet lens, and / or the sixth lens and the seventh lens are combined to form a cemented doublet lens. The latter lens group also satisfies the following optical parameter conditions: Wherein, 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, It includes an optical imaging lens and an imaging element as described in any one of claims 1 to 9, wherein the imaging element is located at the image plane of the optical imaging lens.

Images