Imaging lens

Abstract

The utility model discloses an imaging lens, which sequentially comprises a first lens with negative diopter from an object side to an image side along an optical axis, a second lens with negative diopter, a third lens with negative diopter, a fourth lens with negative diopter and a fifth lens with negative diopter, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface; the object side surface of the fourth lens is a concave surface; the fifth lens has positive diopter, and the object side surface and the image side surface of the fifth lens are convex surfaces; the sixth lens has positive diopter, and the object side surface and the image side surface of the sixth lens are convex surfaces; the object side surface of the seventh lens is a concave surface; the image side surface of the eighth lens is a convex surface; the ninth lens has positive diopter, and the object side surface of the ninth lens is a convex surface; wherein the effective focal length F1 of the first lens and the effective focal length F of the imaging lens meet the condition that F1 / F is greater than or equal to-14 and less than or equal to-5; the total optical length TTL of the imaging lens and the effective focal length F of the imaging lens meet the condition that TTL / F is larger than or equal to 8.5 and smaller than or equal to 10.5.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more particularly, to an imaging lens. Background Art

[0002] In recent years, with the continuous upgrading and development of Internet technology, imaging lenses have been widely used in fields such as video conferencing, security monitoring, and sports photography. Moreover, the market demand tends to be a large field of view angle, and the requirement for image quality is also getting higher and higher.

[0003] The existing video conferencing lenses generally have the following technical problems:

[0004] 1. The picture size is generally small;

[0005] 2. It is difficult to achieve a field of view angle above 140°;

[0006] 3. It is difficult to ensure high imaging quality while ensuring a large field of view angle and a large target surface;

[0007] 4. If we want to take into account a large target surface, a large field of view angle, and high resolution at the same time, we need to increase the number of lenses to improve performance. At this time, there may be problems such as too long total lens length and too large volume, resulting in relatively high lens volume, weight, and cost.

[0008] Therefore, in view of the current development status of imaging lenses, an imaging lens with a large target surface, a large field of view angle, high resolution, and a small volume is one of the current market demands. Summary of the Utility Model

[0009] The present application provides an imaging lens that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0010] The present application provides an imaging lens. Along the optical axis, from the object side to the image side, the imaging lens sequentially includes: a first lens with a negative refractive power, whose object side is convex and image side is concave; a second lens with a negative refractive power, whose object side is convex and image side is concave; a third lens with a positive refractive power, whose object side is convex; a fourth lens, whose object side is concave; a fifth lens with a positive refractive power, whose object side and image side are both convex; a sixth lens with a positive refractive power, whose object side and image side are both convex; a seventh lens with a negative refractive power, whose object side is concave; an eighth lens with a positive refractive power, whose image side is convex; and a ninth lens with a positive refractive power, whose object side is convex.

[0011] In some embodiments, the effective focal length F1 of the first lens and the effective focal length F of the imaging lens satisfy: -14 ≤ F1 / F ≤ -5.

[0012] In some embodiments, the radius of curvature R11 of the object side surface of the first lens and the radius of curvature R12 of the image side surface of the first lens satisfy: 1.2 ≤ R11 / R12 ≤ 2.8.

[0013] In some embodiments, the effective focal length F1 of the first lens and the central thickness d1 of the first lens on the optical axis satisfy: -45 ≤ F1 / d1 ≤ -20.

[0014] In some embodiments, the radius of curvature R31 of the object side surface of the third lens, the radius of curvature R32 of the image side surface of the third lens, and the effective focal length F of the imaging lens satisfy: |F / R31| + |F / R32| ≤ 1.2.

[0015] In some embodiments, the sixth lens and the seventh lens form a doublet lens.

[0016] In some embodiments, the radius of curvature R of the cemented surface of the doublet lens and the maximum effective aperture of the cemented surface of the doublet lens Satisfy:

[0017] In some embodiments, the radius of curvature R62 of the image side surface of the sixth lens and the effective focal length F6 of the sixth lens satisfy: 1.4 ≤ |F6 / R62| ≤ 2.2.

[0018] In some embodiments, the radius of curvature R81 of the object side surface of the eighth lens and the radius of curvature R82 of the image side surface of the eighth lens satisfy: 0.5 ≤ (R81 + R82) / (R81 - R82) ≤ 1.9.

[0019] In some embodiments, the combined focal length F12 of the first lens and the second lens and the effective focal length F of the imaging lens satisfy: -1.8 ≤ F12 / F ≤ -1.0.

[0020] In some embodiments, the central thickness d3 of the third lens on the optical axis, the central thickness d4 of the fourth lens on the optical axis, and the combined focal length F34 of the third lens and the fourth lens satisfy: |(d3 + d4) / F34| ≤ 0.3.

[0021] In some embodiments, the air space C45 between the fourth lens and the fifth lens on the optical axis and the air space C56 between the fifth lens and the sixth lens on the optical axis satisfy: C45 / C56 ≤ 2.

[0022] In some embodiments, the effective focal length F6 of the sixth lens and the effective focal length F7 of the seventh lens satisfy: 1.35 ≤ |F6 / F7| ≤ 2.3.

[0023] In some embodiments, the Abbe number Vd6 of the sixth lens and the Abbe number Vd7 of the seventh lens satisfy: |Vd6 - Vd7| ≥ 45.

[0024] In some embodiments, the total optical length TTL of the imaging lens and the effective focal length F of the imaging lens satisfy: 8.5 ≤ TTL / F ≤ 10.5.

[0025] In some embodiments, the total optical length TTL of the imaging lens and the semi-image height H of the imaging lens satisfy: 4.3 ≤ TTL / H ≤ 5.7.

[0026] In some embodiments, the effective focal length F of the imaging lens and the semi-image height H of the imaging lens satisfy: 0.47 ≤ F / H ≤ 0.65.

[0027] The imaging lens provided in this application adopts nine lenses. By reasonably setting the optical power of each lens, the imaging lens provided in this application has at least one beneficial effect such as a large target surface (the diagonal size of the imaging surface can reach 9 mm), a large field of view FOV ≥ 140°, high resolution (the highest resolution can reach 20 MP), and a small volume (TTL ≤ 23 mm). BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In the drawings:

[0029] Figure 1 is a schematic structural diagram of the imaging lens according to Embodiment 1 of this application;

[0030] Figure 2 is a schematic structural diagram of the imaging lens according to Embodiment 2 of this application;

[0031] Figure 3 is a schematic structural diagram of the imaging lens according to Embodiment 3 of this application;

[0032] Figure 4 is a schematic structural diagram of the imaging lens according to Embodiment 4 of this application; and

[0033] Figure 5 is a schematic structural diagram of the imaging lens according to Embodiment 5 of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To facilitate the understanding of this application, the following will describe this application more comprehensively with reference to the relevant drawings. It should be understood that these detailed descriptions are only descriptions of the exemplary embodiments of this application, and do not limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0036] In the drawings, for the sake of clarity, the thickness, dimensions, and shape of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are presented by way of example. That is, the spherical or aspherical shapes are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0037] In this context, 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 side is called the image side of the lens.

[0038] It should also be understood that the terms "comprises", "comprising", "has", "including", and / or "including having", when used in this specification, denote the presence of the 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. Further, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than individual elements in the list. Additionally, when describing embodiments of the present application, the use of "may" indicates "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0039] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formalized sense unless expressly so defined herein.

[0040] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0041] The features, principles, and other aspects of the present application are described in detail below.

[0042] In an exemplary embodiment, the imaging lens includes nine lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens. These nine lenses are arranged in sequence along the optical axis from the object side to the image side.

[0043] In an exemplary embodiment, the imaging lens may further include an image sensor disposed on the image side of the ninth lens. Optionally, the image sensor disposed on the image side of the ninth lens may be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS).

[0044] In an exemplary embodiment, the imaging lens may further include a diaphragm for restricting the light beam to further improve the imaging quality of the imaging lens. Exemplarily, when the imaging lens includes nine lenses, the diaphragm may be disposed between the fourth lens and the fifth lens, or the diaphragm may be disposed between the fifth lens and the sixth lens. The diaphragm is beneficial to converge the light rays entering the imaging lens, shorten the total length of the optical system, reduce the maximum aperture of the imaging lens, facilitate miniaturization, and reduce the assembly sensitivity of the system. However, it should be noted that the position of the diaphragm disclosed herein is only an example and not a limitation; in alternative embodiments, the diaphragm may also be disposed at other positions according to actual needs.

[0045] In an exemplary embodiment, the first lens has a negative optical power, its object side is convex, and its image side is concave. With this setting of the first lens, in reasonable combination with the second lens, the trend of the light rays incident on the imaging lens can be effectively controlled, and the incident light rays with a larger field of view angle can be collected, achieving the effect of a field of view angle FOV≥140°.

[0046] In an exemplary embodiment, the second lens has a negative optical power, its object side is convex, and its image side is concave. With this setting of the second lens, in reasonable combination with the first lens, the trend of the light rays incident on the imaging lens can be effectively controlled, and the incident light rays with a larger field of view angle can be collected, achieving the effect of a field of view angle FOV≥140°. At the same time, the distortion introduced by the first lens can be balanced, and the pressure on the subsequent optical system to correct the distortion can be reduced.

[0047] In an exemplary embodiment, the third lens has a positive optical power, and its object side is convex. With this setting of the third lens, it is beneficial to collect the light rays exiting from the front optical system, enable the light rays to smoothly transition to the subsequent optical system, suppress the generation of astigmatism, and improve the resolving power of the imaging lens.

[0048] In an exemplary embodiment, the object side of the fourth lens is concave. The fourth lens may be set as an aspherical lens. With this setting of the fourth lens, it is beneficial to correct the aberration in the central field of view region, improve the resolving power of the imaging lens, and also beneficial to obtain a larger aperture.

[0049] In an exemplary embodiment, the fifth lens has a positive optical power, and both its object side and image side are convex surfaces. This arrangement of the fifth lens is conducive to depressing the light path after the aperture, allowing more light to enter the subsequent optical system and increasing the illuminance of the image plane.

[0050] In an exemplary embodiment, the sixth lens has a positive optical power, and both its object side and image side are convex surfaces. The sixth lens and the seventh lens can form a doublet lens. This arrangement of the sixth lens helps to correct chromatic aberration and effectively reduces the tolerance sensitivity of the optical system, which is beneficial to improving the lens assembly yield.

[0051] In an exemplary embodiment, the seventh lens has a negative optical power, and its object side is concave. The seventh lens and the sixth lens can form a doublet lens. This arrangement of the seventh lens helps to correct chromatic aberration and effectively reduces the tolerance sensitivity of the optical system, which is beneficial to improving the lens assembly yield.

[0052] In an exemplary embodiment, the eighth lens has a positive optical power, and its image side is convex. This arrangement of the eighth lens can limit the projection height of the subsequent light, making the light imaging height match the imaging chip.

[0053] In an exemplary embodiment, the ninth lens has a positive optical power, and its object side is convex. The ninth lens can be set as an aspherical surface. This arrangement of the ninth lens can balance various off-axis aberrations of the front optical system by introducing the aspherical surface, which is beneficial to improving the imaging quality of the optical system and the resolution of the imaging lens.

[0054] In an exemplary embodiment, the imaging lens of the present application satisfies: -14 ≤ F1 / F ≤ -5, where F1 is the effective focal length of the first lens and F is the effective focal length of the imaging lens. Satisfying -14 ≤ F1 / F ≤ -5 is beneficial for the first lens to provide sufficient bending power to the optical system while enabling the imaging lens to maintain the characteristic of a large field of view, achieving a field of view FOV ≥ 140°.

[0055] In an exemplary embodiment, the imaging lens of the present application satisfies: 1.2 ≤ R11 / R12 ≤ 2.8, where R11 is the curvature radius of the object side of the first lens and R12 is the curvature radius of the image side of the first lens. Satisfying -1.2 ≤ R11 / R12 ≤ 2.8 can collect light at a larger angle and enter the subsequent optical system, enabling the imaging lens to maintain the characteristic of a large field of view, achieving a field of view FOV ≥ 140°.

[0056] In an exemplary embodiment, the imaging lens of the present application satisfies: -45 ≤ F1 / d1 ≤ -20, where F1 is the effective focal length of the first lens, and d1 is the central thickness of the first lens on the optical axis. Satisfying -45 ≤ F1 / d1 ≤ -20 enables the optical lens to have a larger field of view angle and is beneficial to the miniaturization of the lens.

[0057] In an exemplary embodiment, the imaging lens of the present application satisfies: |F / R31| + |F / R32| ≤ 1.2, where R31 is the curvature radius of the object side surface of the third lens, R32 is the curvature radius of the image side surface of the third lens, and F is the effective focal length of the imaging lens. Satisfying |F / R31| + |F / R32| ≤ 1.2 is beneficial to correcting astigmatism and improving the resolving power of the imaging lens.

[0058] In an exemplary embodiment, the sixth lens and the seventh lens of the imaging lens according to the present application form a doublet lens, and the curvature radius R of the cemented surface of the doublet lens and the maximum effective aperture of the cemented surface of the doublet lens Satisfy: Satisfy It can effectively control the higher-order aberrations of the cemented lens and is beneficial to improving the resolving power of the imaging lens.

[0059] In an exemplary embodiment, the imaging lens of the present application satisfies: 1.4 ≤ |F6 / R62| ≤ 2.2, where R62 is the curvature radius of the image side surface of the sixth lens, and F6 is the effective focal length of the sixth lens. Satisfying 1.4 ≤ |F6 / R62| ≤ 2.2 is beneficial to compressing the outgoing light rays of the front optical system, enabling the light rays to transition to the rear optical system relatively smoothly, while effectively correcting the aberrations of the optical system and reducing the tolerance sensitivity of the optical system, which is beneficial to improving the lens assembly yield.

[0060] In an exemplary embodiment, the imaging lens of the present application satisfies: 0.5 ≤ (R81 + R82) / (R81 - R82) ≤ 1.9, where R81 is the curvature radius of the object side surface of the eighth lens, and R82 is the curvature radius of the image side surface of the eighth lens. Satisfying 0.5 ≤ (R81 + R82) / (R81 - R82) ≤ 1.9 effectively controls the direction of the light rays, slows down the deflection angles of the incident light rays and the outgoing light rays of the eighth lens, enables the light rays to transition to the rear optical system smoothly, is beneficial to reducing the tolerance sensitivity of the optical system, and is beneficial to improving the lens assembly yield.

[0061] In an exemplary embodiment, the imaging lens of the present application satisfies: -1.8 ≤ F12 / F ≤ -1.0, where F12 is the combined focal length of the first lens and the second lens, and F is the effective focal length of the imaging lens. Satisfying -1.8 ≤ F12 / F ≤ -1.0 is beneficial to improving the ability of the front end of the optical system to collect light at large angles, enabling the imaging lens to maintain the characteristic of a large field of view angle, and achieving a field of view angle FOV ≥ 140°.

[0062] In an exemplary embodiment, the imaging lens of the present application satisfies: |(d3 + d4) / F34| ≤ 0.3, where d is the central thickness of the third lens on the optical axis, d4 is the central thickness of the fourth lens on the optical axis, and F34 is the combined focal length F34 of the third lens and the fourth lens. Satisfying |(d3 + d4) / F34| ≤ 0.3 enables light to transition smoothly to the rear optical system, can effectively correct astigmatism and spherical aberration, is beneficial to improving the resolution of the imaging lens, and enables the lens resolution to reach up to 20MP.

[0063] In an exemplary embodiment, the imaging lens of the present application satisfies: C45 / C56 ≤ 2, where C45 is the air gap between the fourth lens and the fifth lens on the optical axis, and C56 is the air gap C56 between the fifth lens and the sixth lens on the optical axis. Satisfying C45 / C56 ≤ 2 allows light to pass through the optical system smoothly, is beneficial to reducing the tolerance sensitivity of the optical system, and is beneficial to improving the lens assembly yield.

[0064] In an exemplary embodiment, the imaging lens of the present application satisfies: 1.35 ≤ |F6 / F7| ≤ 2.3, where F6 is the effective focal length of the sixth lens, and F7 is the effective focal length F7 of the seventh lens. Satisfying 1.35 ≤ |F6 / F7| ≤ 2.3 allows light to pass through the optical system smoothly, is beneficial to correcting chromatic aberration, improving the resolution of the imaging lens, and at the same time reducing the tolerance sensitivity of the optical system, and is beneficial to improving the lens assembly yield.

[0065] In an exemplary embodiment, the imaging lens of the present application satisfies: |Vd6 - Vd7| ≥ 45, where Vd6 is the Abbe number of the sixth lens, and Vd7 is the Abbe number Vd7 of the seventh lens. Satisfying |Vd6 - Vd7| ≥ 45 effectively corrects the chromatic aberration of the optical system, and is beneficial to improving the resolution of the imaging lens.

[0066] In an exemplary embodiment, the imaging lens of the present application satisfies: 8.5 ≤ TTL / F ≤ 10.5, where TTL is the overall optical length of the imaging lens, and F is the effective focal length of the imaging lens. Satisfying 8.5 ≤ TTL / F ≤ 10.5 limits the optical system to have a relatively small overall length, controls the overall optical length range within TTL ≤ 23mm, and is beneficial to realizing the miniaturization of the imaging lens.

[0067] In an exemplary embodiment, the imaging lens of the present application satisfies: 4.3 ≤ TTL / H ≤ 5.7, where TTL is the total optical length of the imaging lens and H is the semi-image height of the imaging lens. Satisfying 4.3 ≤ TTL / H ≤ 5.7 limits the total length of the optical system to be relatively small, and controls the total optical length range to TTL ≤ 23 mm, which is beneficial to realizing the miniaturization of the imaging lens.

[0068] In an exemplary embodiment, the imaging lens of the present application satisfies: 0.47 ≤ F / H ≤ 0.65, where F is the effective focal length of the imaging lens and H is the semi-image height of the imaging lens. Satisfying 0.47 ≤ F / H ≤ 0.65 enables the optical system to have a larger imaging height, which is beneficial to realizing the large target surface effect of the imaging lens.

[0069] Optionally, in an exemplary embodiment, as needed, the imaging lens of the present application may further include a filter and / or a protective glass disposed between the ninth lens and the imaging surface to filter light rays with different wavelengths and prevent damage to the image-side elements (such as chips) of the imaging lens.

[0070] In an exemplary embodiment, each lens of the imaging lens of the present application can be a spherical lens or an aspherical lens. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on reflecting the imaging quality, the number of aspherical lenses can be increased, and even all lenses can use aspherical mirrors. The characteristic of an aspherical lens is that the curvature continuously changes from the center to the periphery of the lens. Different from a spherical lens with a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality of the lens. Optionally, the object side and the image side of the second lens to the fourth lens, and the eighth lens to the ninth lens are aspherical mirrors, and the object side and the image side of the first lens, the fifth lens to the seventh lens are spherical mirrors.

[0071] The imaging lens according to the above embodiment of the present application can adopt nine lenses. By reasonably distributing optical technical characteristics such as the optical power of each lens, at least one beneficial effect such as a large target surface, a large field of view angle, high resolution, and a small volume of the imaging lens can be achieved.

[0072] The imaging lens provided by the present application can achieve technical effects such as a large target surface (the diagonal size of the imaging surface can reach 9 mm), a large field of view angle (FOV ≥ 140°), high resolution (the highest resolution can reach 20 MP), and a small volume (TTL ≤ 23 mm), and can be adapted to the video conferencing field.

[0073] The imaging lens according to the above-described embodiment of the present application may employ nine lenses. 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 lens may be changed to obtain the various results and advantages described in this specification. For example, although the nine-lens or ten-lens example is described in the embodiment, the imaging lens is not limited to including nine lenses or ten lenses. If necessary, the imaging lens may also include other numbers of lenses. Specific embodiments of the imaging lens applicable to the above-described embodiment will be further described below with reference to the accompanying drawings.

[0074] Example 1

[0075] The following refers to Figure 1 an imaging lens according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of the imaging lens according to Embodiment 1 of the present application is shown.

[0076] As Figure 1 shown, the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 from the object side to the image side along the optical axis.

[0077] The first lens L1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave.

[0078] The second lens L2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave.

[0079] The third lens L3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex.

[0080] The fourth lens L4 has a negative optical power, its object side surface S7 is concave, and its image side surface S8 is concave.

[0081] The fifth lens L5 has a positive optical power, its object side surface S10 is convex, and its image side surface S11 is convex.

[0082] The sixth lens L6 has a positive optical power, its object side surface S12 is convex, and its image side surface S13 is convex.

[0083] The seventh lens L7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave.

[0084] The eighth lens L8 has a positive optical power, its object side surface S15 is convex, and its image side surface S16 is convex.

[0085] The ninth lens L9 has a positive optical power, its object side surface S17 is convex, and its image side surface S18 is convex.

[0086] The sixth lens L6 and the seventh lens L7 form a doublet lens.

[0087] The imaging lens may further include a stop STO (S9), and the stop STO (S9) may be disposed between the fourth lens L4 and the fifth lens L5. Optionally, the imaging lens may further include a filter CG having an object side S19 and an image side S20 and / or a protective glass (not shown) having an object side and an image side. The filter CG and / or the protective glass may be used to correct color deviation, and the filter CG and / or the protective glass may also be used to protect the image sensing chip located at the imaging surface IMA (S21). Light from an object sequentially passes through the surfaces S1 to S20 and finally forms an image on the imaging surface IMA (S21).

[0088] Table 1 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens of the imaging lens of Example 1, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0089] Table 1

[0090]

[0091] In this embodiment, the object side and the image side of any one of the second lens L2 to the fourth lens L4 and the eighth lens L8 to the ninth lens L9 are aspherical surfaces, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0092]

[0093] where x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis direction; 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 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 gives the conic coefficient k and the high-order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 and A 16 .

[0094] Table 2

[0095] Surface number K A4 A6 A8 A10 A12 A14 A16 S3 0.00 -1.40E-03 -4.45E-06 1.97E-07 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 -0.98 7.59E-05 -4.75E-05 -1.65E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 6.85 -6.56E-04 2.94E-05 -3.37E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 7.22 -4.23E-04 5.37E-05 -3.31E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S7 0.68 1.07E-04 5.70E-04 -4.97E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 27.13 7.38E-03 7.11E-04 1.15E-04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S15 0.00 2.59E-03 -1.88E-04 5.94E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S16 -0.69 3.02E-03 -8.26E-05 4.96E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S17 0.96 -2.42E-03 -1.71E-04 5.59E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S18 -27.17 -1.90E-03 -5.73E-05 4.84E-07 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0096] In this embodiment, the f-number Fno of the imaging lens is 2.40, and the maximum field of view FOV of the imaging lens is 141.7°.

[0097] Example 2

[0098] The following refers to Figure 2 an imaging lens according to Embodiment 2 of the present application. Figure 2 A schematic structural diagram of the imaging lens according to Embodiment 2 of the present application is shown.

[0099] As Figure 2 shown, the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 from the object side to the image side along the optical axis.

[0100] The first lens L1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave.

[0101] The second lens L2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave.

[0102] The third lens L3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex.

[0103] The fourth lens L4 has a negative optical power, its object side surface S7 is concave, and its image side surface S8 is convex.

[0104] The fifth lens L5 has a positive optical power, its object side surface S10 is convex, and its image side surface S11 is convex.

[0105] The sixth lens L6 has a positive optical power, its object side surface S12 is convex, and its image side surface S13 is convex.

[0106] The seventh lens L7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave.

[0107] The eighth lens L8 has a positive optical power, its object side surface S15 is convex, and its image side surface S16 is convex.

[0108] The ninth lens L9 has a positive optical power, its object side surface S17 is convex, and its image side surface S18 is concave.

[0109] The sixth lens L6 and the seventh lens L7 form a doublet lens.

[0110] The imaging lens may further include a diaphragm STO (S9), and the diaphragm STO (S9) may be disposed between the fourth lens L4 and the fifth lens L5. Optionally, the imaging lens may further include a filter CG having an object side S19 and an image side S20 and / or a protective glass (not shown) having an object side and an image side. The filter CG and / or the protective glass may be used to correct color deviation, and the filter CG and / or the protective glass may also be used to protect the image sensing chip located at the imaging surface IMA (S21). Light from an object sequentially passes through the surfaces S1 to S20 and finally forms an image on the imaging surface IMA (S21).

[0111] Table 3 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens of the imaging lens according to Embodiment 2, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0112] Table 3

[0113]

[0114] In this embodiment, the object side and the image side of any one of the second lens L2 to the fourth lens L4 and the eighth lens L8 to the ninth lens L9 are aspherical surfaces, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0115]

[0116] where x is the sagitta, the distance from the vertex of the aspherical surface at a position with a height of h along the optical axis; 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 3 above); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 4 gives the conic coefficient k and the high-order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 and A 16 for each of the aspherical surfaces S1 - S6, S13 - S16 in Embodiment 2.

[0117] Table 4

[0118] Surface number K A4 A6 A8 A10 A12 A14 A16 S3 78.44 1.61E-03 -7.82E-05 2.49E-06 -3.84E-08 9.82E-11 5.19E-12 -4.17E-14 S4 -0.87 7.97E-04 5.77E-04 -1.06E-04 5.02E-06 1.48E-06 -2.13E-07 8.51E-10 S5 -51.24 -5.73E-03 -6.10E-04 -6.99E-05 1.84E-07 2.05E-06 2.48E-08 -1.64E-09 S6 13.22 -1.21E-02 1.33E-03 3.15E-05 1.67E-06 4.51E-07 3.15E-07 -5.04E-08 S7 -1.75 9.27E-03 3.65E-03 -1.23E-03 1.02E-04 2.22E-06 -1.30E-06 2.10E-07 S8 -7.26 1.21E-02 3.83E-03 -4.11E-04 -9.69E-05 6.08E-06 8.70E-07 -1.42E-07 S15 -38.32 2.94E-03 -1.34E-04 -1.30E-05 -4.62E-07 1.23E-07 -3.87E-09 -2.08E-10 S16 -0.70 4.08E-03 1.75E-05 9.23E-06 -8.64E-07 -1.56E-09 -1.22E-09 -4.65E-11 S17 -28.88 -7.05E-03 2.10E-04 -1.41E-05 -3.44E-07 4.86E-09 1.95E-09 6.32E-11 S18 -90.00 -7.15E-03 2.92E-04 -1.81E-05 2.79E-07 1.12E-08 -1.12E-10 1.86E-11

[0119] In this embodiment, the aperture number Fno of the imaging lens is 2.40, and the maximum field of view FOV of the imaging lens is 140.5°.

[0120] Example 3

[0121] The following refers toFigure 3 Describes an imaging lens according to Embodiment 3 of the present application. Figure 3 Shows a schematic structural diagram of an imaging lens according to Embodiment 3 of the present application.

[0122] As Figure 3 shown, the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 from the object side to the image side along the optical axis.

[0123] The first lens L1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave.

[0124] The second lens L2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave.

[0125] The third lens L3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is concave.

[0126] The fourth lens L4 has a positive optical power, its object side surface S7 is concave, and its image side surface S8 is convex.

[0127] The fifth lens L5 has a positive optical power, its object side surface S10 is convex, and its image side surface S11 is convex.

[0128] The sixth lens L6 has a positive optical power, its object side surface S12 is convex, and its image side surface S13 is convex.

[0129] The seventh lens L7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave.

[0130] The eighth lens L8 has a positive optical power, its object side surface S15 is concave, and its image side surface S16 is convex.

[0131] The ninth lens L9 has a positive optical power, its object side surface S17 is convex, and its image side surface S18 is concave.

[0132] The sixth lens L6 and the seventh lens L7 form a doublet lens.

[0133] The imaging lens may further include a stop STO (S9), and the stop STO (S9) may be disposed between the fourth lens L4 and the fifth lens L5. Optionally, the imaging lens may further include a filter CG having an object side surface S19 and an image side surface S20 and / or a protective glass (not shown) having an object side surface and an image side surface. The filter CG and / or the protective glass can be used to correct color deviation, and the filter CG and / or the protective glass can also be used to protect the image sensing chip located at the imaging surface IMA (S21). Light from the object sequentially passes through the surfaces S1 to S20 and finally forms an image on the imaging surface IMA (S21).

[0134] Table 5 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens of the imaging lens of Example 3, where the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0135] Table 5

[0136]

[0137] In this embodiment, the object side and the image side of any one of the second lens L2 to the fourth lens L4, and the eighth lens L8 to the ninth lens L9 are both aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0138]

[0139] 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 (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 5 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 6 gives the conic coefficient k and the high-order term coefficients A 4 、A 6 、A 8 、A 10 、A 12 、A 14 and A 16 .

[0140] Table 6

[0141]

[0142]

[0143] In this embodiment, the f-number Fno of the imaging lens is 2.20, and the maximum field of view FOV of the imaging lens is 140.0°.

[0144] Example 4

[0145] The following refers to Figure 4 to describe the imaging lens according to Embodiment 4 of the present application. Figure 4 shows a schematic structural diagram of the imaging lens according to Embodiment 4 of the present application.

[0146] As Figure 4As shown, the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 from the object side to the image side along the optical axis.

[0147] The first lens L1 has a negative focal power, its object side surface S1 is convex, and its image side surface S2 is concave.

[0148] The second lens L2 has a negative focal power, its object side surface S3 is convex, and its image side surface S4 is concave.

[0149] The third lens L3 has a positive focal power, its object side surface S5 is convex, and its image side surface S6 is concave.

[0150] The fourth lens L4 has a negative focal power, its object side surface S7 is concave, and its image side surface S8 is convex.

[0151] The fifth lens L5 has a positive focal power, its object side surface S9 is convex, and its image side surface S10 is convex.

[0152] The sixth lens L6 has a positive focal power, its object side surface S12 is convex, and its image side surface S13 is convex.

[0153] The seventh lens L7 has a negative focal power, its object side surface S13 is concave, and its image side surface S14 is concave.

[0154] The eighth lens L8 has a positive focal power, its object side surface S15 is convex, and its image side surface S16 is convex.

[0155] The ninth lens L9 has a positive focal power, its object side surface S17 is convex, and its image side surface S18 is concave.

[0156] The sixth lens L6 and the seventh lens L7 form a doublet lens.

[0157] The imaging lens may further include a diaphragm STO (S11), and the diaphragm STO (S11) may be disposed between the fifth lens L5 and the sixth lens L6. Optionally, the imaging lens may further include a filter CG having an object side surface S19 and an image side surface S20 and / or a protective glass (not shown) having an object side surface and an image side surface. The filter CG and / or the protective glass can be used to correct color deviation, and the filter CG and / or the protective glass can also be used to protect the image sensing chip located at the imaging surface IMA (S21). Light from the object sequentially passes through the surfaces S1 to S20 and finally forms an image on the imaging surface IMA (S21).

[0158] Table 7 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens of the imaging lens of Example 4, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0159] Table 7

[0160]

[0161]

[0162] In this embodiment, the object side and the image side of any one of the second lens L2 to the fourth lens L4, and the eighth lens L8 to the ninth lens L9 are both aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0163]

[0164] where x is the sagitta, which is 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 7 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 8 gives the conic coefficients k and the higher-order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 and A 16 .

[0165] Table 8

[0166]

[0167]

[0168] In this embodiment, the f-number Fno of the imaging lens is 2.20, and the maximum field of view FOV of the imaging lens is 140.3°.

[0169] Example 5

[0170] The following refers to Figure 5 to describe the imaging lens according to Embodiment 4 of the present application. Figure 5 FIG. shows a schematic structural diagram of the imaging lens according to Embodiment 4 of the present application.

[0171] As Figure 5 shown, the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 along the optical axis from the object side to the image side.

[0172] The first lens L1 has a negative optical power, with its object side S1 being convex and its image side S2 being concave.

[0173] The second lens L2 has a negative optical power, with its object side S3 being convex and its image side S4 being concave.

[0174] The third lens L3 has a positive optical power, with its object side S5 being convex and its image side S6 being concave.

[0175] The fourth lens L4 has a negative optical power, with its object side S7 being concave and its image side S8 being concave.

[0176] The fifth lens L5 has a positive optical power, with its object side S9 being convex and its image side S10 being convex.

[0177] The sixth lens L6 has a positive optical power, with its object side S12 being convex and its image side S13 being convex.

[0178] The seventh lens L7 has a negative optical power, with its object side S13 being concave and its image side S14 being convex.

[0179] The eighth lens L8 has a positive optical power, with its object side S15 being concave and its image side S16 being convex.

[0180] The ninth lens L9 has a positive optical power, with its object side S17 being convex and its image side S18 being concave.

[0181] The sixth lens L6 and the seventh lens L7 form a doublet lens.

[0182] The imaging lens may further include a diaphragm STO (S11), and the diaphragm STO (S11) may be disposed between the fifth lens L5 and the sixth lens L6. Optionally, the imaging lens may further include a filter CG having an object side S19 and an image side S20 and / or a protective glass (not shown) having an object side and an image side. The filter CG and / or the protective glass can be used to correct color deviation, and the filter CG and / or the protective glass can also be used to protect the image sensing chip located at the imaging surface IMA (S21). Light from the object sequentially passes through the surfaces S1 to S20 and finally forms an image on the imaging surface IMA (S21).

[0183] Table 9 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens of the imaging lens in Embodiment 4, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0184] Table 9

[0185]

[0186]

[0187] In this embodiment, the object side and the image side of any one of the second lens L2 to the fourth lens L4, and the eighth lens L8 to the ninth lens L9 are aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0188]

[0189] 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 (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 9 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 10 gives the conic coefficient k and the high-order term coefficients A 4 、A 6 、A 8 、A 10 、A 12 、A 14 and A 16 .

[0190] Table 10

[0191] Surface number K A4 A6 A8 A10 A12 A14 A16 S3 3.06 2.95E-03 -1.87E-04 5.37E-06 -5.00E-08 -4.68E-10 3.07E-12 1.54E-13 S4 -1.03 6.13E-03 -1.06E-03 7.34E-04 -2.07E-04 2.77E-05 -1.86E-06 4.99E-08 S5 -90.00 -3.39E-04 -6.81E-04 9.25E-06 8.32E-07 4.10E-07 5.46E-08 -6.59E-09 S6 90.00 -9.89E-03 1.99E-03 -6.36E-04 1.01E-04 1.23E-05 -5.39E-06 4.85E-07 S7 -6.23 2.19E-04 1.36E-04 1.03E-06 -3.84E-05 1.93E-05 -3.36E-06 2.24E-07 S8 -90.00 2.87E-02 -4.38E-03 8.32E-04 -8.86E-05 -2.52E-06 2.26E-06 -3.15E-07 S15 -90.00 -4.75E-03 7.02E-04 -6.14E-05 -1.26E-06 2.81E-07 7.39E-08 -5.54E-09 S16 -0.59 -1.33E-03 -3.44E-05 8.50E-05 -7.56E-06 -1.88E-07 1.99E-08 8.51E-10 S17 -3.04 -2.83E-03 -1.47E-04 1.31E-06 1.23E-06 -1.56E-07 2.40E-09 -4.34E-11 S18 90.00 6.01E-04 -7.47E-04 4.66E-05 -8.73E-07 -3.33E-08 -1.52E-10 4.85E-11

[0192] In this embodiment, the f-number Fno of the imaging lens is 2.40, and the maximum field of view FOV of the imaging lens is 140.8°.

[0193] In summary, Embodiments 1 to 5 satisfy the relationships shown in Table 11 below.

[0194] Table 11

[0195] The present application also provides an electronic device, which may include an imaging lens according to the above-described embodiments of the present application and an imaging element for converting the optical image formed by the imaging lens into an electrical signal.

[0196] The above description is only the preferred embodiments of the present application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features having similar functions disclosed in the present application.

Claims

1. An imaging lens, characterized in that: The imaging lens includes, in order from the object side to the image side along the optical axis: The first lens has a negative refractive power, and its object side surface is convex and its image side surface is concave; The second lens has a negative refractive power, and its object side surface is convex and its image side surface is concave; a third lens element having positive refractive power and a convex object side surface; The fourth lens has a concave object side surface; A fifth lens element with positive refractive power, whose object side surface and image side surface are both convex; A sixth lens element having positive refractive power, whose object side surface and image side surface are both convex; a seventh lens element having negative refractive power, whose object side surface is concave; an eighth lens element having positive refractive power, the image-side surface of which is convex; and A ninth lens element having positive refractive power, whose object side surface is convex; Wherein, the effective focal length F1 of the first lens and the effective focal length F of the imaging lens satisfy: -14≤F1 / F≤-5; The total optical length TTL of the imaging lens and the effective focal length F of the imaging lens satisfy the following conditions: 8.5≤TTL / F≤10.

5.

2. The imaging lens according to claim 1, characterized in that: A curvature radius R11 of the object-side surface of the first lens and a curvature radius R12 of the image-side surface of the first lens satisfy: 1.2≤R11 / R12≤2.

8.

3. The imaging lens according to claim 1, wherein: The combined effective focal length F12 of the first lens and the second lens and the effective focal length F of the imaging lens satisfy the following: -1.8≤F12 / F≤-1.

0.

4. The imaging lens according to claim 1, wherein: The effective focal length F1 of the first lens and the center thickness d1 of the first lens on the optical axis satisfy: -45≤F1 / d1≤-20.

5. The imaging lens according to claim 1, wherein: A curvature radius R31 of the object side surface of the third lens, a curvature radius R32 of the image side surface of the third lens, and an effective focal length F of the imaging lens satisfy: |F / R31|+|F / R32|≤1.

2.

6. The imaging lens according to claim 1, wherein: The sixth lens and the seventh lens form a doublet lens.

7. The imaging lens according to claim 6, characterized in that: The radius of curvature R of the bonding surface of the double-cemented lens and the maximum effective aperture φ of the bonding surface of the double-cemented lens satisfy the following: 0.3≤|R / φ|≤0.

9.

8. The imaging lens according to claim 1, wherein: A radius of curvature R62 of the image-side surface of the sixth lens and an effective focal length F6 of the sixth lens satisfy: 1.4≤|F6 / R62|≤2.

2.

9. The imaging lens according to claim 1, wherein: An effective focal length F6 of the sixth lens and an effective focal length F7 of the seventh lens satisfy: 1.35≤|F6 / F7|≤2.

3.

10. The imaging lens according to any one of claims 1 to 9, characterized in that: A curvature radius R81 of the object-side surface of the eighth lens and a curvature radius R82 of the image-side surface of the eighth lens satisfy: 0.5≤(R81+R82) / (R81-R82)≤1.

9.

11. The imaging lens according to any one of claims 1 to 9, characterized in that: The center thickness d3 of the third lens on the optical axis, the center thickness d4 of the fourth lens on the optical axis, and the combined focal length F34 of the third lens and the fourth lens satisfy: |(d3+d4) / F34|≤0.

3.

12. The imaging lens according to any one of claims 1 to 9, characterized in that: An air interval C45 between the fourth lens and the fifth lens on the optical axis and an air interval C56 between the fifth lens and the sixth lens on the optical axis satisfy: C45 / C56≤2.

13. The imaging lens according to any one of claims 1 to 9, characterized in that: The Abbe number Vd6 of the sixth lens and the Abbe number Vd7 of the seventh lens satisfy: |Vd6-Vd7|≥45.

14. The imaging lens according to any one of claims 1 to 9, characterized in that: The total optical length TTL of the imaging lens and the half image height H of the imaging lens satisfy: 4.3≤TTL / H≤5.

7.

15. The imaging lens according to any one of claims 1 to 9, characterized in that: The effective focal length F of the imaging lens and the half image height H of the imaging lens satisfy: 0.47≤F / H≤0.65.

Images