An optical imaging lens

Abstract

The present application discloses an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive focal power; a second lens with positive focal power; a third lens with negative focal power; a fourth lens with positive focal power; a fifth lens with negative focal power; a sixth lens; a seventh lens; an eighth lens with positive focal power; and a ninth lens with negative focal power; wherein half of the diagonal length of the effective pixel area on the imaging plane ImgH and the effective focal length f of the optical imaging lens satisfy: ImgH*EPD / f>5.5mm. The present invention provides a nine-piece optical imaging lens with high imaging quality.

Description

Technical Field

[0001] The present invention belongs to the field of optical imaging, and in particular relates to an optical imaging lens comprising nine lenses. Background Art

[0002] With the rapid development of science and technology, people's demand for diversified functions of products is increasing, and portable electronic products are widely used. However, as portable electronic products will develop towards miniaturization, and as the performance of CCD and COMS image sensors improves and the size decreases, higher requirements are put forward for camera lenses. In order to meet the market demand for camera lenses, the present invention provides a nine-piece optical imaging lens with high imaging quality. Summary of the invention

[0003] The present invention aims to provide an optical imaging lens composed of nine lenses, which has the characteristics of increasing the field of view angle, improving the relative illumination of the off-axis field of view, achieving an imaging effect of a large image surface, reducing pupil aberration, and improving imaging quality.

[0004] The present invention provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens having positive focal power; a second lens having positive focal power; a third lens having negative focal power; a fourth lens having positive focal power; a fifth lens having negative focal power; a sixth lens having focal power; a seventh lens having focal power; an eighth lens having positive focal power; and a ninth lens having negative focal power; wherein half of the diagonal length of an effective pixel area on an imaging plane ImgH and an effective focal length f of the optical imaging lens satisfy the following conditions: ImgH*EPD / f>5.5mm.

[0005] According to one embodiment of the present application, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: 0<(f2+f3) / f1<2.5.

[0006] According to one embodiment of the present application, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens, and the effective focal length f8 of the eighth lens satisfy: 0<(f4+f8) / f6<1.2.

[0007] According to one embodiment of the present application, a curvature radius R2 of the image-side surface of the first lens and a curvature radius R1 of the object-side surface of the first lens satisfy 1.0<(R2+R1) / (R2-R1)<2.5.

[0008] According to one embodiment of the present application, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 1.1 <R5 / R6<1.7。

[0009] According to one embodiment of the present application, the curvature radius R15 of the object side surface of the eighth lens and the curvature radius R16 of the image side surface of the eighth lens satisfy: 1.1 <R16 / R15<2.4。

[0010] According to one embodiment of the present application, a curvature radius R17 of the object side surface of the ninth lens, a curvature radius R18 of the image side surface of the ninth lens, and an effective focal length f9 of the ninth lens satisfy: 0<(R18-R17) / f9<1.6.

[0011] According to one embodiment of the present application, half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfies: 7.5 mm <ImgH<9mm。

[0012] According to one embodiment of the present application, the composite focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 4.0 <f12 / (CT1+CT2)<7.0。

[0013] According to one embodiment of the present application, the composite focal length f78 of the seventh lens and the eighth lens, the center thickness CT7 of the seventh lens on the optical axis, and the center thickness CT8 of the eighth lens on the optical axis satisfy: 5.0 <f78 / (CT7+CT8)<11.0。

[0014] According to one embodiment of the present application, the air interval T89 between the eighth lens and the ninth lens on the optical axis and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 0.5 <T89 / T34<3.0。

[0015] According to one embodiment of the present application, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET8 of the eighth lens and the edge thickness ET9 of the ninth lens satisfy: 1.0<(ET8+ET9) / (ET3+ET4+ET5)<1.8.

[0016] According to an embodiment of the present application, at least four lenses among the first lens to the ninth lens are made of plastic.

[0017] According to one embodiment of the present application, air gaps are independently provided between each of the first lens to the ninth lens.

[0018] The present invention also provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens has positive optical focal power; a second lens has positive optical focal power; a third lens has negative optical focal power; a fourth lens has positive optical focal power; a fifth lens has negative optical focal power; a sixth lens has optical focal power; a seventh lens has optical focal power; an eighth lens has positive optical focal power; and a ninth lens has negative optical focal power; wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 0<(f2+f3) / f1<2.5.

[0019] According to one embodiment of the present application, half of the diagonal length of the effective pixel area on the imaging plane ImgH and the effective focal length f of the optical imaging lens satisfy the following conditions: ImgH*EPD / f>5.5mm.

[0020] According to one embodiment of the present application, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens, and the effective focal length f8 of the eighth lens satisfy: 0<(f4+f8) / f6<1.2.

[0021] According to one embodiment of the present application, a curvature radius R2 of the image-side surface of the first lens and a curvature radius R1 of the object-side surface of the first lens satisfy 1.0<(R2+R1) / (R2-R1)<2.5.

[0022] According to one embodiment of the present application, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 1.1 <R5 / R6<1.7。

[0023] According to one embodiment of the present application, the curvature radius R15 of the object side surface of the eighth lens and the curvature radius R16 of the image side surface of the eighth lens satisfy: 1.1 <R16 / R15<2.4。

[0024] According to one embodiment of the present application, a curvature radius R17 of the object side surface of the ninth lens, a curvature radius R18 of the image side surface of the ninth lens, and an effective focal length f9 of the ninth lens satisfy: 0<(R18-R17) / f9<1.6.

[0025] According to one embodiment of the present application, half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfies: 7.5 mm <ImgH<9mm。

[0026] According to one embodiment of the present application, the composite focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 4.0 <f12 / (CT1+CT2)<7.0。

[0027] According to one embodiment of the present application, the composite focal length f78 of the seventh lens and the eighth lens, the center thickness CT7 of the seventh lens on the optical axis, and the center thickness CT8 of the eighth lens on the optical axis satisfy: 5.0 <f78 / (CT7+CT8)<11.0。

[0028] According to one embodiment of the present application, the air interval T89 between the eighth lens and the ninth lens on the optical axis and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 0.5 <T89 / T34<3.0。

[0029] According to one embodiment of the present application, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET8 of the eighth lens and the edge thickness ET9 of the ninth lens satisfy: 1.0<(ET8+ET9) / (ET3+ET4+ET5)<1.8.

[0030] According to an embodiment of the present application, at least four lenses among the first lens to the ninth lens are made of plastic.

[0031] According to one embodiment of the present application, air gaps are independently provided between each of the first lens to the ninth lens.

[0032] Beneficial effects of the present invention:

[0033] The optical imaging lens provided by the present invention comprises a plurality of lenses, such as a first lens to a ninth lens. The first lens and the second lens of the present invention have positive optical power, which are beneficial to increasing the field angle; the third lens with negative optical power is beneficial to improving the relative illumination of the off-axis field of view; the fourth lens with positive optical power can reduce pupil aberration and improve imaging quality; the eighth lens with positive optical power is beneficial to increasing image height; the ninth lens with negative optical power can achieve an imaging effect of a large image surface by constraining the ratio of image height to F number. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 Schematic diagram of the structure of a lens assembly of an optical imaging lens embodiment 1 of the present invention;

[0036] Figure 2a to Figure 2dThey are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens embodiment 1 of the present invention;

[0037] Figure 3 Schematic diagram of the lens group structure of Embodiment 2 of the optical imaging lens of the present invention;

[0038] Figures 4a to 4d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 2 of the optical imaging lens of the present invention;

[0039] Figure 5 Schematic diagram of the lens group structure of Embodiment 3 of the optical imaging lens of the present invention;

[0040] Figures 6a to 6d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 3 of the optical imaging lens of the present invention;

[0041] Figure 7 Schematic diagram of the lens group structure of Embodiment 4 of the optical imaging lens of the present invention;

[0042] Figures 8a to 8d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 4 of the optical imaging lens of the present invention;

[0043] Fig. 9 Schematic diagram of the lens group structure of Embodiment 5 of the optical imaging lens of the present invention;

[0044] Figures 10a to 10d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 5 of the optical imaging lens of the present invention;

[0045] Fig.11 Schematic diagram of the structure of a lens group of an optical imaging lens embodiment 6 of the present invention;

[0046] Figures 12a to 12d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 6 of the optical imaging lens of the present invention;

[0047] Fig.13 Schematic diagram of the structure of a lens group of an optical imaging lens embodiment 7 of the present invention;

[0048] Figures 14a to 14d They are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 7 of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0050] It should be noted that in this specification, the expressions of 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 the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0051] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", 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 "exemplary" is intended to refer to an example or illustration.

[0052] In the drawings, 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.

[0053] In the description of the present invention, 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.

[0054] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal way unless explicitly defined in this article.

[0055] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0056] Exemplary Embodiments

[0057] The optical imaging lens of an exemplary embodiment of the present invention includes nine lenses, which include, in order from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens with positive optical power; a third lens with negative optical power; a fourth lens with positive optical power; a fifth lens with negative optical power; a sixth lens with optical power; a seventh lens with optical power; an eighth lens with positive optical power; and a ninth lens with negative optical power.

[0058] Among them, half of the diagonal length of the effective pixel area on the imaging plane ImgH and the effective focal length f of the optical imaging lens satisfy: ImgH*EPD / f>5.5mm. The first lens and the second lens with positive optical power are conducive to increasing the field of view angle; the third lens with negative optical power is conducive to improving the relative illumination of the off-axis field of view; the fourth lens with positive optical power can reduce pupil aberration and improve imaging quality; the eighth lens with positive optical power is conducive to increasing the image height; the ninth lens with negative optical power can achieve the imaging effect of a large image surface by constraining the ratio of image height and F number. More specifically, half of the diagonal length of the effective pixel area on the imaging plane ImgH and the effective focal length f of the optical imaging lens satisfy: ImgH*EPD / f>6.3mm.

[0059] In this exemplary embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: 0<(f2+f3) / f1<2.5. By constraining the ratio of the sum of the effective focal length of the second lens and the effective focal length of the third lens to the effective focal length of the first lens, the spherical aberration remaining after balancing can be used to balance the spherical aberration generated by the first lens, thereby fine-tuning the spherical aberration of the system and reducing the aberration of the on-axis field of view. More specifically, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: 0.22<(f2+f3) / f1<2.42.

[0060] In the present exemplary embodiment, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens, and the effective focal length f8 of the eighth lens satisfy: 0 < (f4 + f8) / f6 < 1.2. By constraining the ratio of the sum of the effective focal lengths of the fourth lens and the eighth lens to the effective focal length of the sixth lens within a reasonable range, the field curvature of the constraint system can be reasonably controlled within a certain range. More specifically, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens, and the effective focal length f8 of the eighth lens satisfy: 0.25 < (f4 + f8) / f6 < 1.

[0061] In the present exemplary embodiment, the radius of curvature R2 of the image side of the first lens and the radius of curvature R1 of the object side of the first lens satisfy: 1.0 < (R2 + R1) / (R2 - R1) < 2.5. By constraining the ratio of the difference and sum of the radii of curvature of the object side and the image side of the first lens within a certain range, the coma of the on-axis field of view and the off-axis field of view is made smaller, and the imaging system has good imaging quality. More specifically, the radius of curvature R2 of the image side of the first lens and the radius of curvature R1 of the object side of the first lens satisfy: 1.3 < (R2 + R1) / (R2 - R1) < 2.2.

[0062] In the present exemplary embodiment, the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy: 1.1 < R5 / R6 < 1.7. By constraining the ratio of the radius of curvature of the object side to the radius of curvature of the image side of the third lens, the contribution of the third lens to the astigmatism of the imaging system can be reasonably controlled. More specifically, the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy: 1.25 < R5 / R6 < 1.6.

[0063] In the present exemplary embodiment, the radius of curvature R15 of the object side of the eighth lens and the radius of curvature R16 of the image side of the eighth lens satisfy: 1.1 < R16 / R15 < 2.4. By constraining the ratio of the radius of curvature of the object side to the radius of curvature of the image side of the eighth lens, the contribution of the eighth lens to the astigmatism of the imaging system can be reasonably controlled, and the imaging system has better imaging quality. More specifically, the radius of curvature R15 of the object side of the eighth lens and the radius of curvature R16 of the image side of the eighth lens satisfy: 1.3 < R16 / R15 < 2.25.

[0064] In this exemplary embodiment, the radius of curvature R17 of the object side surface of the ninth lens, the radius of curvature R18 of the image side surface of the ninth lens, and the effective focal length f9 of the ninth lens satisfy: 0 < (R18 - R17) / f9 < 1.6. By constraining the ratio of the difference in the radius of curvature of the object side surface of the ninth lens to the effective focal length, the deflection of the incident light of the system in the ninth lens can be effectively controlled, thereby reducing the sensitivity of the system. More specifically, the radius of curvature R17 of the object side surface of the ninth lens, the radius of curvature R18 of the image side surface of the ninth lens, and the effective focal length f9 of the ninth lens satisfy: 0.03 < (R18 - R17) / f9 < 1.5.

[0065] In this exemplary embodiment, half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfies: 7.5 mm < ImgH < 9 mm. By controlling the full image height, the imaging range of the system can be effectively controlled. More specifically, half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfies: 7.7 mm < ImgH < 8.6 mm

[0066] In this exemplary embodiment, the combined focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 4.0 < f12 / (CT1 + CT2) < 7.0. By constraining the ratio of the combined focal length of the first lens and the second lens to the sum of the central thicknesses of the first lens and the second lens on the axis, the manifestation of coma of the system can be reasonably controlled, enabling the optical system to have good optical performance. More specifically, the combined focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 4.5 < f12 / (CT1 + CT2) < 6.6.

[0067] In this exemplary embodiment, the combined focal length f78 of the seventh lens and the eighth lens, the central thickness CT7 of the seventh lens on the optical axis, and the central thickness CT8 of the eighth lens on the optical axis satisfy: 5.0 < f78 / (CT7 + CT8) < 11.0. By constraining the ratio of the combined focal length of the seventh lens and the eighth lens to the sum of the central thicknesses of the seventh lens and the eighth lens on the axis, the manifestation of coma of the system can be reasonably controlled, enabling the optical system to have good optical performance. More specifically, the combined focal length f78 of the seventh lens and the eighth lens, the central thickness CT7 of the seventh lens on the optical axis, and the central thickness CT8 of the eighth lens on the optical axis satisfy: 5.5 < f78 / (CT7 + CT8) < 10.8.

[0068] In the present exemplary embodiment, the air gap T89 between the eighth lens and the ninth lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 0.5 < T89 / T34 < 3.0. By constraining the ratio of the air gap between the eighth lens and the ninth lens to the air gap between the third lens and the fourth lens, the field curvature contribution of each field of view can be controlled within a reasonable range. More specifically, the air gap T89 between the eighth lens and the ninth lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 0.7 < T89 / T34 < 2.9.

[0069] In the present exemplary embodiment, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET8 of the eighth lens, and the edge thickness ET9 of the ninth lens satisfy: 1.0 < (ET8 + ET9) / (ET3 + ET4 + ET5) < 1.8. By constraining the ratio of the sum of the edge thickness of the eighth lens and the edge thickness of the ninth lens to the sum of the edge thickness of the third lens, the edge thickness of the fourth lens, and the edge thickness of the fifth lens, the stability of the optical system is improved. More specifically, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET8 of the eighth lens, and the edge thickness ET9 of the ninth lens satisfy: 1.2 < (ET8 + ET9) / (ET3 + ET4 + ET5) < 1.6

[0070] In the present exemplary embodiment, at least 4 of the first lens to the ninth lens are made of plastic. Setting the lens material as a plastic material enables the optical element to have good processability.

[0071] In the present exemplary embodiment, there are air gaps independently between each of the first lens to the ninth lens. Having air gaps independently between each lens is beneficial to the stability of the system and enables the optical system to have good processability.

[0072] In the present exemplary embodiment, the object side and the image side of any one of the first lens E1 to the ninth lens E9 are aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0073]

[0074] where x is the sagitta, the distance from the vertex of the aspherical surface to the aspherical surface along the optical axis at a position with a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface.

[0075] In this exemplary embodiment, the optical imaging lens may further include a stop. The stop may be disposed at an appropriate position as required, for example, the stop may be disposed between the object side and the first lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0076] The optical imaging lens according to the above embodiment of the present invention may use multiple lenses, such as the above nine lenses. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, the optical imaging lens has a larger imaging surface, a wide imaging range, and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[0077] In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side of the first lens to the image side of the ninth lens is an aspherical mirror surface. The characteristics of the aspherical lens are: from the center of the lens to the periphery of the lens, the curvature changes continuously. Unlike the spherical lens with a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens is an aspherical mirror surface. Optionally, the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are all aspherical mirror surfaces.

[0078] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although nine lenses are described as an example in the embodiments, the optical imaging lens is not limited to including nine lenses, and the optical imaging lens may also include other numbers of lenses if necessary.

[0079] Specific embodiments of the optical imaging lens applicable to the above embodiments are further described below with reference to the accompanying drawings. Specific embodiment 1

[0081] Figure 11 is a schematic diagram of the structure of a lens group of Embodiment 1 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10 and an imaging surface S21.

[0082] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The ninth lens E9 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E10 has an object side surface S19 and an image side surface S20. Light from the object passes through each surface S1 to S20 in sequence and is finally imaged on the imaging surface S21.

[0083] As shown in Table 1, it is a basic parameter table of the optical imaging lens of Example 1, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0084]

[0085] Table 1

[0086] As shown in Table 2, in Example 1, the total effective focal length of the optical imaging lens is f=9.65 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S21 of the optical imaging lens is 13.80 mm, and half of the diagonal length of the effective pixel area on the imaging surface S21 is ImgH=8.10 mm. The maximum field of view of the optical imaging lens is FOV=79.1°.

[0087]

[0088]

[0089] Table 2

[0090] The optical imaging lens in Example 1 satisfies:

[0091] ImgH*EPD / f=6.64mm, where ImgH is half of the diagonal length of the effective pixel area on the imaging surface, and f is the effective focal length of the optical imaging lens.

[0092] (f2+f3) / f1=0.66, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens.

[0093] (f4+f8) / f6=0.98, wherein f4 is the effective focal length of the fourth lens, f6 is the effective focal length of the sixth lens, and f8 is the effective focal length of the eighth lens.

[0094] (R2+R1) / (R2-R1)=1.72, wherein R2 is the radius of curvature of the image side surface of the first lens, and R1 is the radius of curvature of the object side surface of the first lens.

[0095] R5 / R6=1.34, wherein R5 is the radius of curvature of the object side surface of the third lens, and R6 is the radius of curvature of the image side surface of the third lens.

[0096] R16 / R15=1.45, wherein R15 is the radius of curvature of the object side of the eighth lens, and R16 is the radius of curvature of the image side of the eighth lens.

[0097] (R18-R17) / f9=1.47, wherein R17 is the curvature radius of the object side surface of the ninth lens, R18 is the curvature radius of the image side surface of the ninth lens, and f9 is the effective focal length of the ninth lens.

[0098] ImgH=8.10 mm, where ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0099] f12 / (CT1+CT2)=5.89, wherein f12 is the combined focal length of the first and second lenses, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0100] f78 / (CT7+CT8)=10.14, wherein f78 is the combined focal length of the seventh and eighth lenses, CT7 is the center thickness of the seventh lens on the optical axis, and CT8 is the center thickness of the eighth lens on the optical axis.

[0101] T89 / T34=1.73, wherein T89 is the air space between the eighth lens and the ninth lens on the optical axis, and T34 is the air space between the third lens and the fourth lens on the optical axis.

[0102] (ET8+ET9) / (ET3+ET4+ET5)=1.56, wherein ET3 is the edge thickness of the third lens, ET4 is the edge thickness of the fourth lens, ET5 is the edge thickness of the fifth lens, ET8 is the edge thickness of the eighth lens, and ET9 is the edge thickness of the ninth lens.

[0103] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the ninth lens E9 are aspherical surfaces. Table 3 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S18 that can be used in Example 1. 4 , A 6 , A 8 , A 1 0. A 12 , A 14 , A 16 , A 18 and A 20 .

[0104]

[0105]

[0106] Table 3

[0107] Figure 2a The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 2b The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 2c The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 2d The magnification chromatic aberration curve of the optical imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 2a to Figure 2d It can be seen from the figure that the optical imaging lens provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0109] Figure 3 2 is a schematic diagram of the structure of a lens group of an optical imaging lens embodiment 2 of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10 and an imaging surface S21.

[0110] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The ninth lens E9 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E10 has an object side surface S19 and an image side surface S20. Light from the object passes through each surface S1 to S20 in sequence and is finally imaged on the imaging surface S21.

[0111] As shown in Table 4, it is a basic parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0112]

[0113] Table 4

[0114] As shown in Table 5, in Example 2, the total effective focal length of the optical imaging lens is f=9.52 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S21 of the optical imaging lens is 13.50 mm, and half of the diagonal length of the effective pixel area on the imaging surface S21 is ImgH=8.20 mm. The maximum field of view of the optical imaging lens is FOV=80.7°.

[0115]

[0116] Table 5

[0117] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the ninth lens E9 are aspherical surfaces. Table 6 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S18 that can be used in Example 2. 4 , A 6 , A 8 , A 1 0. A 12 , A 14 , A 16 , A 18 and A 20 .

[0118]

[0119]

[0120] Table 6

[0121] Figure 4a The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4b The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 4c The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4d The magnification chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 4a to 4d It can be seen from the figure that the optical imaging lens provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0123] Figure 5 2 is a schematic diagram of the structure of a lens group of Embodiment 3 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10 and an imaging surface S21.

[0124] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The ninth lens E9 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E10 has an object side surface S19 and an image side surface S20. Light from the object passes through each surface S1 to S20 in sequence and is finally imaged on the imaging surface S21.

[0125] As shown in Table 7, it is a basic parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0126]

[0127]

[0128] Table 7

[0129] As shown in Table 8, in Example 3, the total effective focal length f of the optical imaging lens is 9.57 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S21 of the optical imaging lens is 13.50 mm, and half of the diagonal length of the effective pixel area on the imaging surface S21 is ImgH=8.50 mm. The maximum field of view FOV of the optical imaging lens is 82.1°.

[0130]

[0131] Table 8

[0132] In Example 3, the object side surface and the image side surface of any one of the first lens E1 to the ninth lens E9 are aspherical surfaces. Table 9 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S18 that can be used in Example 3. 4 , A 6 , A 8 , A 1 0. A 12 , A 14 , A 16 , A 18 and A 20 .

[0133]

[0134]

[0135] Table 9

[0136] Figure 6a The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6b The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 6c The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 6d The magnification chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 6a to 6dIt can be seen from the figure that the optical imaging lens provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0138] Figure 7 2 is a schematic diagram of the structure of a lens group of an optical imaging lens embodiment 4 of the present invention. The optical imaging lens includes, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10 and an imaging surface S21.

[0139] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The ninth lens E9 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E10 has an object side surface S19 and an image side surface S20. Light from the object passes through each surface S1 to S20 in sequence and is finally imaged on the imaging surface S21.

[0140] As shown in Table 10, it is a basic parameter table of the optical imaging lens of Example 4, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0141]

[0142] Table 10

[0143] As shown in Table 11, in Example 4, the total effective focal length f of the optical imaging lens is 8.17 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S21 of the optical imaging lens is 12.00 mm, and half of the diagonal length of the effective pixel area on the imaging surface S21 is ImgH=8.05 mm. The maximum field of view FOV of the optical imaging lens is 87.8°.

[0144]

[0145] Table 11

[0146] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the ninth lens E9 are aspherical surfaces. Table 12 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S18 that can be used in Example 4. 4 , A 6 , A 8 , A 1 0. A 12 , A 14 , A 16 , A 18 and A 20 .

[0147]

[0148]

[0149] Table 12

[0150] Figure 8a The axial chromatic aberration curve of the optical imaging lens of Example 4 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 8b The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 8c The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 8d The magnification chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 8a to 8d It can be seen from the figure that the optical imaging lens provided in Example 4 can achieve good imaging quality. Specific embodiment 5

[0152] Fig. 9 2 is a schematic diagram of the structure of a lens group of an optical imaging lens embodiment 5 of the present invention. The optical imaging lens includes, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10 and an imaging surface S21.

[0153] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The ninth lens E9 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E10 has an object side surface S19 and an image side surface S20. Light from the object passes through each surface S1 to S20 in sequence and is finally imaged on the imaging surface S21.

[0154] As shown in Table 13, it is a basic parameter table of the optical imaging lens of Example 5, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0155]

[0156]

[0157] Table 13

[0158] As shown in Table 14, in Example 5, the total effective focal length f of the optical imaging lens is 8.14 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S21 of the optical imaging lens is 12.00 mm, and half of the diagonal length of the effective pixel area on the imaging surface S21 is ImgH=8.08 mm. The maximum field of view FOV of the optical imaging lens is 87.4°.

[0159]

[0160] Table 14

[0161] In Example 5, the object side surface and the image side surface of any one of the first lens E1 to the ninth lens E9 are aspherical surfaces. Table 15 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S18 that can be used in Example 5. 4 , A 6 , A 8 , A 1 0. A 12 , A 14 , A 16 , A 18 and A20 .

[0162]

[0163]

[0164] Table 15

[0165] Fig.10a The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig.10b The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.10c The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.10d The magnification chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 10a to 10d It can be seen from the figure that the optical imaging lens provided in Example 5 can achieve good imaging quality. Specific embodiment 6

[0167] Fig.11 2 is a schematic diagram of the structure of a lens group of Embodiment 6 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10 and an imaging surface S21.

[0168] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The ninth lens E9 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E10 has an object side surface S19 and an image side surface S20. Light from the object passes through each surface S1 to S20 in sequence and is finally imaged on the imaging surface S21.

[0169] As shown in Table 16, it is a basic parameter table of the optical imaging lens of Example 6, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0170]

[0171] Table 16

[0172] As shown in Table 17, in Example 6, the total effective focal length f of the optical imaging lens is 7.28 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S21 of the optical imaging lens is 10.84 mm, and half of the diagonal length of the effective pixel area on the imaging surface S21 is ImgH=7.90 mm. The maximum field of view FOV of the optical imaging lens is 79.0°.

[0173]

[0174] Table 17

[0175] In Example 6, the object side surface and the image side surface of any one of the first lens E1 to the ninth lens E9 are aspherical surfaces. Table 18 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S18 that can be used in Example 6. 4 , A 6 , A 8 , A 1 0. A 12 , A 14 , A 16 , A 18 and A 20 .

[0176]

[0177]

[0178] Table 18

[0179] Fig.12a The axial chromatic aberration curve of the optical imaging lens of Example 6 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 12b The astigmatism curve of the optical imaging lens of Example 6 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.12c The distortion curve of the optical imaging lens of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.12d The magnification chromatic aberration curve of the optical imaging lens of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 12a to 12d It can be seen from the figure that the optical imaging lens provided in Example 6 can achieve good imaging quality. Specific embodiment 7

[0181] Fig.13 2 is a schematic diagram of the structure of a lens group of Embodiment 7 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10 and an imaging surface S21.

[0182] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The ninth lens E9 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E10 has an object side surface S19 and an image side surface S20. Light from the object passes through each surface S1 to S20 in sequence and is finally imaged on the imaging surface S21.

[0183] As shown in Table 19, it is a basic parameter table of the optical imaging lens of Example 7, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0184]

[0185]

[0186] Table 19

[0187] As shown in Table 20, in Example 7, the total effective focal length of the optical imaging lens is f=7.31 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S21 of the optical imaging lens is 7.80 mm, and the half of the diagonal length of the effective pixel area on the imaging surface S21 is ImgH=7.80 mm. The maximum field of view of the optical imaging lens is FOV=78.5°.

[0188]

[0189] Table 20

[0190] In Example 7, the object side surface and the image side surface of any one of the first lens E1 to the ninth lens E9 are aspherical surfaces. Table 21 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S18 that can be used in Example 7. 4 , A 6 , A 8 , A 1 0. A 12 , A 14 , A 16 , A 18 and A 20 .

[0191]

[0192]

[0193] Table 21

[0194] Fig.14a The axial chromatic aberration curve of the optical imaging lens of Example 7 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig.14b The astigmatism curve of the optical imaging lens of Example 7 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.14c The distortion curve of the optical imaging lens of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.14d The magnification chromatic aberration curve of the optical imaging lens of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 14a to 14d It can be seen from the figure that the optical imaging lens provided in Example 7 can achieve good imaging quality.

[0195] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, It is characterized in that The optical imaging lens has nine lenses with optical power, and the optical imaging lens includes, in order from the object side to the image side along the optical axis: The first lens has positive refractive power, and its object side surface is convex and its image side surface is concave; A second lens having positive refractive power and a convex image-side surface; The third lens has a negative optical power, and its object side surface is convex and its image side surface is concave; a fourth lens element having positive refractive power and a convex image-side surface; A fifth lens having negative optical power, whose object side surface is convex and image side surface is concave; a sixth lens having positive refractive power, whose object side surface is concave and image side surface is convex; a seventh lens having positive or negative power, whose object side surface is concave and whose image side surface is convex; An eighth lens having positive refractive power, whose object side surface is convex and image side surface is concave; The ninth lens has a negative optical power, and its object side surface is convex and its image side surface is concave; Wherein, half of the diagonal length of the effective pixel area on the imaging surface ImgH and the effective focal length f of the optical imaging lens satisfy: 6.39mm≤ImgH*EPD / f≤6.97mm; A combined focal length f78 of the seventh lens and the eighth lens, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy: 5.7≤f78 / (CT7+CT8)≤10.

14.

2. The optical imaging lens according to claim 1, Features: The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: 0.24≤(f2+f3) / f1≤1.

35.

3. The optical imaging lens according to claim 1, Features: The effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens and the effective focal length f8 of the eighth lens satisfy: 0.29≤(f4+f8) / f6≤0.

98.

4. The optical imaging lens according to claim 1, Features: A curvature radius R2 of the image-side surface of the first lens and a curvature radius R1 of the object-side surface of the first lens satisfy 1.38≤(R2+R1) / (R2-R1)≤2.

19.

5. The optical imaging lens according to claim 1, Features: A curvature radius R5 of the object side surface of the third lens and a curvature radius R6 of the image side surface of the third lens satisfy: 1.28≤R5 / R6≤1.

57.

6. The optical imaging lens according to claim 1, Features: A curvature radius R15 of the object side surface of the eighth lens and a curvature radius R16 of the image side surface of the eighth lens satisfy: 1.32≤R16 / R15≤2.

2.

7. The optical imaging lens according to claim 1, Features: The curvature radius R17 of the object side surface of the ninth lens, the curvature radius R18 of the image side surface of the ninth lens and the effective focal length f9 of the ninth lens satisfy: 0<(R18-R17) / f9≤1.

47.

8. The optical imaging lens according to claim 1, Features: Half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: 7.8mm≤ImgH≤8.5mm.

9. The optical imaging lens according to claim 1, Features: The combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 4.59≤f12 / (CT1+CT2)≤6.

57.

10. The optical imaging lens according to claim 1, Features: An air interval T89 between the eighth lens and the ninth lens on the optical axis and an air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 0.72≤T89 / T34≤2.

89.

11. The optical imaging lens according to claim 1, Features: An edge thickness ET3 of the third lens, an edge thickness ET4 of the fourth lens, an edge thickness ET5 of the fifth lens, an edge thickness ET8 of the eighth lens, and an edge thickness ET9 of the ninth lens satisfy: 1.29≤(ET8+ET9) / (ET3+ET4+ET5)≤1.

56.

12. The optical imaging lens according to claim 1, Features: At least four lenses from the first lens to the ninth lens are made of plastic.

13. The optical imaging lens according to claim 1, Features: There is an air gap between each lens among the first lens to the ninth lens independently.

Images