Imaging lens

Abstract

The embodiment of the utility model discloses an imaging lens. From an object side to an image side along an optical axis, the imaging lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens, a second lens group including at least one lens; the third lens has positive focal power; the fourth lens has negative focal power; a diaphragm; the fifth lens has negative focal power; the sixth lens has positive focal power; the seventh lens has positive focal power; the eighth lens has negative focal power; the ninth lens has positive focal power; the tenth lens has negative focal power; the eleventh lens has positive focal power; wherein the holographic height IH of the imaging lens, the total effective focal length f of the imaging lens and the aperture number FNO of the imaging lens meet the condition that IH / f / FNO is larger than or equal to 0.53 and smaller than or equal to 0.68.

Description

Technical Field

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

[0002] With the development of modern economic construction and management, the demand for road monitoring has become increasingly important, and more requirements have been put forward for its matching lenses.

[0003] The smart traffic cameras on the market today have the following shortcomings:

[0004] 1. The lens distortion is large, making the image restoration unrealistic;

[0005] 2. The lens aperture is small, which makes the picture uniformity not high;

[0006] 3. The lens has a problem of narrow object distance, which makes the lens unsuitable for use scenarios;

[0007] 4. Existing lenses have a short back focus, which makes them unsuitable for a variety of interfaces;

[0008] 5. The existing lens CRA (Chief Ray Angle) is too large to match a variety of chips;

[0009] In summary, the current intelligent traffic lenses have large distortion, small aperture, narrow object distance range, short back focus, do not meet the scene usage, have a large CRA, and are difficult to cope with future market development trends. Utility Model Content

[0010] According to an embodiment of the present application, an imaging lens is provided, which includes, in order from the object side to the image side along the optical axis: a first lens with negative optical power; a second lens group, which includes at least one lens; a third lens with positive optical power; a fourth lens with negative optical power; an aperture; a fifth lens with negative optical power; a sixth lens with positive optical power; a seventh lens with positive optical power; an eighth lens with negative optical power; a ninth lens with positive optical power; a tenth lens with negative optical power; and an eleventh lens with positive optical power; wherein the total image height IH of the imaging lens, the total effective focal length f of the imaging lens, and the aperture number FNO of the imaging lens satisfy: 0.53≤IH / f / FNO≤0.68.

[0011] In some embodiments, the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the lens closest to the object side in the second lens group is concave, and the image side surface of the lens closest to the image side is convex; the object side surface of the third lens is convex; the image side surface of the fourth lens is concave; the object side surface and the image side surface of the fifth lens are both concave; the object side surface and the image side surface of the sixth lens are both convex; the object side surface and the image side surface of the seventh lens are both convex; the object side surface of the eighth lens is convex, and the image side surface is concave; the object side surface and the image side surface of the ninth lens are both convex; the object side surface and the image side surface of the tenth lens are both concave; and the object side surface and the image side surface of the eleventh lens are both convex.

[0012] In some embodiments, the second lens group includes a second lens with negative optical power, and the object-side surface of the second lens is concave, and the image-side surface is convex.

[0013] In some embodiments, the second lens group includes a first cemented lens and a second cemented lens, and the first cemented lens and the second cemented lens form a cemented lens; wherein the first cemented lens has negative optical power, and its object side surface is concave; and the second cemented lens has positive optical power, and its image side surface is convex.

[0014] In some embodiments, the curvature radius R21 of the object side surface and the curvature radius R22 of the image side surface of the first cemented lens, and the curvature radius R31 of the object side surface and the curvature radius R32 of the image side surface of the second cemented lens satisfy: -0.01≤(R21 / R22) / (R31 / R32)≤0.04.

[0015] In some embodiments, the effective focal length fB21 of the first cemented lens and the effective focal length fB22 of the second cemented lens satisfy: -1.03≤fB22 / fB21≤-0.88.

[0016] In some embodiments, the eighth lens to the eleventh lens form a quadruple-cemented lens, and the effective focal length fB4 of the quadruple-cemented lens and the total effective focal length f of the imaging lens satisfy: 2.09≤fB4 / f≤2.91.

[0017] In some embodiments, the effective focal length f1 of the first lens and the total effective focal length f of the imaging lens satisfy: -3.46≤f1 / f≤-2.43.

[0018] In some embodiments, a curvature radius R81 on the object side surface and a curvature radius R82 on the image side surface of the eighth lens, and a curvature radius R101 on the object side surface and a curvature radius R102 on the image side surface of the tenth lens satisfy: -62.34≤(R81+R82) / (R101+R102)≤-2.4.

[0019] In some embodiments, the optical back focal length BFL of the imaging lens and the optical total length TTL of the imaging lens satisfy: 0.27≤BFL / TTL≤0.29.

[0020] In some embodiments, the effective focal length f3 of the third lens and the total effective focal length f of the imaging lens satisfy: 1.14≤f3 / f≤1.62.

[0021] In some embodiments, the effective focal length f4 of the fourth lens and the total effective focal length f of the imaging lens satisfy: -1.66≤f4 / f≤-1.19.

[0022] In some embodiments, the effective focal length f5 of the fifth lens and the total effective focal length f of the imaging lens satisfy: -0.85≤f5 / f≤-0.62.

[0023] In some embodiments, the effective focal length f6 of the sixth lens and the total effective focal length f of the imaging lens satisfy: 0.86≤f6 / f≤1.14.

[0024] In some embodiments, the effective focal length f7 of the seventh lens and the total effective focal length f of the imaging lens satisfy: 1.28≤f7 / f≤2.23.

[0025] In some embodiments, the effective focal length f8 of the eighth lens and the total effective focal length f of the imaging lens satisfy: -1.84≤f8 / f≤-1.28.

[0026] In some embodiments, the effective focal length f9 of the ninth lens and the total effective focal length f of the imaging lens satisfy: 0.75≤f9 / f≤0.94.

[0027] In some embodiments, the effective focal length f10 of the tenth lens and the total effective focal length f of the imaging lens satisfy: -0.71≤f10 / f≤-0.6.

[0028] In some embodiments, the effective focal length f11 of the eleventh lens and the total effective focal length f of the imaging lens satisfy: 0.76≤f11 / f≤0.83.

[0029] According to the imaging lens provided in the embodiment of the present application, through the distribution of the focal power of each lens and the surface design, a large aperture can be achieved on the one hand, and chromatic aberration, aberration and distortion can be well corrected on the other hand, and at least one of the design requirements of low distortion, large aperture, wide range of object distance, back focal length and small CRA can be met. The imaging lens provided in the present application can be applied to intelligent traffic lenses, for example, to meet the market development needs for road monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0031] Figure 1 A schematic structural diagram of an imaging lens according to Embodiment 1 of the present application is shown;

[0032] Figure 2 shows an optical distortion curve of an imaging lens according to Example 1 of the present application;

[0033] Figure 3 A schematic structural diagram of an imaging lens according to Embodiment 2 of the present application is shown;

[0034] Figure 4 shows an optical distortion curve of an imaging lens according to Example 2 of the present application;

[0035] Figure 5 A schematic structural diagram of an imaging lens according to Embodiment 3 of the present application is shown;

[0036] Figure 6 shows an optical distortion curve of an imaging lens according to Example 3 of the present application;

[0037] Figure 7 A schematic structural diagram of an imaging lens according to Embodiment 4 of the present application is shown;

[0038] Figure 8 shows an optical distortion curve of an imaging lens according to Example 4 of the present application;

[0039] Fig. 9 A schematic structural diagram of an imaging lens according to Embodiment 5 of the present application is shown;

[0040] Fig.10 shows an optical distortion curve of an imaging lens according to Example 5 of the present application;

[0041] Fig.11 A schematic structural diagram of an imaging lens according to Embodiment 6 of the present application is shown; and

[0042] Fig.12 The optical distortion curve of the imaging lens according to Example 6 of the present application is shown. DETAILED DESCRIPTION

[0043] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present 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.

[0044] 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 application, the first lens discussed below may also be referred to as the second lens or the first lens.

[0045] 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.

[0046] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0047] 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.

[0048] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those 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 sense unless explicitly defined in this article.

[0049] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following examples only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can also be made, which all belong to the protection scope of the present application.

[0050] The features, principles and other aspects of the present application are described in detail below.

[0051] refer to Figure 1 As shown, according to an embodiment of the present application, an imaging lens is provided, including: a first lens L1, a second lens group B2, a third lens L3, a fourth lens L4, an aperture STO, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10 and an eleventh lens L11, which are arranged in sequence from the object side to the image side along the optical axis.

[0052] In an exemplary embodiment, the first lens L1 may have negative power, and its object side surface may be convex, and its image side surface may be concave. By setting the first lens of the imaging lens to have negative power, it is beneficial to increase the entrance pupil diameter of the imaging lens and increase the aperture of the imaging lens, thereby achieving a large aperture effect.

[0053] In some exemplary embodiments, the second lens group B2 includes at least one lens, for example, a second lens L2. The second lens L2 may have negative refractive power, and its object-side surface may be a concave surface, and its image-side surface may be a convex surface.

[0054] In some other exemplary embodiments, the second lens group B2 may include a first cemented lens B21 and a second cemented lens B22, and the first cemented lens B21 and the second cemented lens B22 may form a cemented lens, wherein the first cemented lens B21 may have negative optical power, and its object side surface may be a concave surface; the second cemented lens B22 may have positive optical power, and its image side surface may be a convex surface. By reasonably setting the optical power and shape of each lens in the second lens group, the deflection of light passing through the second lens group can be reduced, which is conducive to correcting the distortion of the imaging lens, thereby achieving a low distortion effect.

[0055] In an exemplary embodiment, the third lens L3 may have positive power, and its object side surface may be convex; the fourth lens L4 may have negative power, and its image side surface may be concave; the fifth lens L5 may have negative power, and both its object side surface and image side surface are concave; the sixth lens L6 may have positive power, and both its object side surface and image side surface are convex. In an exemplary embodiment, the imaging lens may further include an aperture (STO), for example, the aperture may be arranged between the fourth lens L4 and the fifth lens L5, and the position relative to the imaging plane (IMA) is fixed. The aperture is arranged here, which is conducive to the lens or lens group before and after the aperture to form a double Gaussian symmetric structure, thereby achieving the effect of using a wide range of object distances. By reasonably setting the power and shape of the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 of the imaging lens, the third lens L3, the fourth lens L4 and the fifth lens L5, the sixth lens L6 form a double Gaussian symmetric structure, thereby achieving the effect of using a wide range of object distances. In addition, by properly using materials with a refractive index temperature coefficient, for example, the refractive index temperature coefficient dn / dT of the sixth lens is -3.5 to -3.1, and properly setting the optical focal length and shape of the sixth lens, it is helpful to achieve a lens athermal effect.

[0056] In an exemplary embodiment, the seventh lens L7 may have positive power, and its object side surface and image side surface are both convex. By properly setting the power and shape of the seventh lens of the imaging lens, it is beneficial for light to smoothly transition from the object side surface of the seventh lens to the image side surface of the seventh lens, resulting in a smaller coma aberration, thereby achieving a high resolution effect.

[0057] In an exemplary embodiment, the eighth lens L8 may have negative optical power, with a convex object side and a concave image side. By properly setting the optical power and shape of the eighth lens, it is helpful to raise the light, increase the image plane and back focus length of the imaging lens, and thus achieve a large target surface and long back focus effect.

[0058] In an exemplary embodiment, the ninth lens L9 may have positive optical power, and its object side surface and image side surface are both convex. By properly using a material with a refractive index temperature coefficient, for example, the refractive index temperature coefficient dn / dT of the ninth lens is -7.7 to -7.0, and properly setting the optical power and shape of the ninth lens, it is beneficial to achieve a lens athermal effect.

[0059] In an exemplary embodiment, the tenth lens L10 has negative optical power, and its object side and image side are both concave. Reasonable setting of the optical power and shape of the tenth lens is conducive to raising the light, increasing the image plane and back focus length of the imaging lens, thereby achieving a large target surface and long back focus effect.

[0060] In an exemplary embodiment, the eleventh lens L11 has positive refractive power, and its object side surface and image side surface are both convex. By properly setting the image side surface shape of the eleventh lens of the imaging lens, and matching it with the object side surface shape of the third lens, the spherical aberration generated by other lenses can be compensated together, which is conducive to achieving a high resolution effect.

[0061] In an exemplary embodiment, the cemented lens in the second lens group B2 satisfies: -0.01≤(R21 / R22) / (R31 / R32)≤0.04, where R21 and R22 are the curvature radii of the object side and image side of the first cemented lens B21, respectively, and R31 and R32 are the curvature radii of the object side and image side of the second cemented lens B22, respectively. By properly controlling the curvature radii of the first cemented lens B21 and the second cemented lens B22, the light is smoothly transitioned from the object side of the first cemented lens B21 to the image side of the second cemented lens B22, which is beneficial to correcting the distortion of the imaging lens and achieving a low distortion effect.

[0062] In an exemplary embodiment, the cemented lens in the second lens group satisfies: -1.03≤fB22 / fB21≤-0.88, where fB21 is the effective focal length of the first cemented lens B21, and fB22 is the effective focal length of the second cemented lens B22. By properly controlling the focal length ratio of the first cemented lens B21 and the second cemented lens B22, the deflection of light passing through the first cemented lens B21 and the second cemented lens B22 can be reduced, which is beneficial to correcting the distortion of the imaging lens and achieving a low distortion effect.

[0063] In an exemplary embodiment, the eighth lens L8, the ninth lens L9, the tenth lens L10 and the eleventh lens L11 form a four-cemented lens, and the four-cemented lens satisfies: 2.09≤fB4 / f≤2.91, where fB4 is the effective focal length of the four-cemented lens, and f is the total effective focal length of the imaging lens. The use of a four-cemented lens can reduce chromatic aberration and is conducive to achieving a high resolution effect; and by reasonably controlling the ratio of the focal length of the four-cemented lens to the focal length of the imaging lens, it is conducive to lowering the upper and lower rays of the maximum field of view, and achieving a small CRA effect.

[0064] In some other exemplary embodiments, the eighth lens L8 and the ninth lens L9 may form a doublet lens, and the tenth lens L10 and the eleventh lens L11 may form a doublet lens.

[0065] In an exemplary embodiment, the imaging lens satisfies: 0.53≤IH / f / FNO≤0.68, where IH is the total image height of the imaging lens, f is the total effective focal length of the imaging lens, and FNO is the aperture number of the imaging lens. By properly controlling the relationship between the image height, effective focal length, and aperture of the imaging lens, it is beneficial to balance the relationship between the image height and the aperture, achieve image quality balance, and enable the imaging lens to achieve a large aperture effect at a certain image height.

[0066] In an exemplary embodiment, the imaging lens satisfies: -3.46≤f1 / f≤-2.43, where f1 is the effective focal length of the first lens, and f is the total effective focal length of the imaging lens. By setting the first lens to a suitable focal length, it is helpful to increase the entrance pupil diameter of the imaging lens, increase the aperture of the imaging lens, and achieve a large aperture effect.

[0067] In an exemplary embodiment, the imaging lens satisfies: -62.34≤(R81+R82) / (R101+R102)≤-2.4, where R81 is the radius of curvature of the first surface (e.g., object side) of the eighth lens, R82 is the radius of curvature of the second surface (e.g., image side) of the eighth lens, R101 is the radius of curvature of the first surface (e.g., object side) of the tenth lens, and R102 is the radius of curvature of the second surface (e.g., image side) of the tenth lens. By reasonably controlling the parameter relationship of the radius of curvature of the eighth lens and the tenth lens of the imaging lens, it is beneficial to increase the image plane and back focus length of the imaging lens, and achieve a large image plane and long back focus effect.

[0068] In an exemplary embodiment, the imaging lens satisfies: 0.27≤BFL / TTL≤0.29, where BFL is the optical back focus length of the imaging lens, and TT is the total optical length of the imaging lens. By reasonably controlling the ratio of the optical back focus to the total optical length, the imaging lens can achieve a long back focus effect under a certain total optical length, so that it can be applied to a variety of interfaces.

[0069] In an exemplary embodiment, the imaging lens satisfies: 1.14≤f3 / f≤1.62, where f3 is the effective focal length of the third lens, and f is the total effective focal length of the imaging lens. By properly setting the focal length ratio of the third lens to the optical lens, the deflection of light passing through the third lens can be reduced, resulting in less distortion, thereby achieving a low distortion effect.

[0070] In an exemplary embodiment, the imaging lens satisfies: -1.66≤f4 / f≤-1.19, where f4 is the effective focal length of the fourth lens and f is the total effective focal length of the imaging lens. By properly setting the focal length ratio of the fourth lens to the imaging lens, positive spherical aberration is generated to compensate for the positive spherical aberration generated by the third lens, which is conducive to achieving a high resolution effect.

[0071] In an exemplary embodiment, the imaging lens satisfies: -0.85≤f5 / f≤-0.62, where f5 is the effective focal length of the fifth lens, and f is the total effective focal length of the imaging lens. By properly setting the focal length ratio of the fifth lens to the imaging lens, a smaller magnification chromatic aberration is generated, which is conducive to achieving a high resolution effect.

[0072] In an exemplary embodiment, the imaging lens satisfies: 0.86≤f6 / f≤1.14, where f6 is the effective focal length of the sixth lens and f is the total effective focal length of the imaging lens. By properly setting the focal length ratio of the sixth lens to the imaging lens, a smaller vertical axis chromatic aberration is generated, which is beneficial for achieving a high resolution effect while satisfying the non-thermal effect.

[0073] In an exemplary embodiment, the imaging lens satisfies: 1.28≤f7 / f≤2.23, where f7 is the effective focal length of the seventh lens, and f is the total effective focal length of the imaging lens. By properly setting the focal length ratio of the seventh lens to the imaging lens, a smaller coma aberration is generated, which is conducive to achieving a high resolution effect.

[0074] In an exemplary embodiment, the imaging lens satisfies: -1.84≤f8 / f≤-1.28, where f8 is the effective focal length of the eighth lens, and f is the total effective focal length of the imaging lens. By setting the eighth lens of the imaging lens to have a negative focal length, it is beneficial to raise the light, increase the image plane and back focus length of the imaging lens, and thus achieve a large target surface and long back focus effect; at the same time, the focal length ratio of the eighth lens to the imaging lens is reasonably set to produce a smaller field curvature, which is beneficial to achieving a high resolution effect, and can slow down the deflection of the light passing through the eighth lens, so that it produces a smaller distortion, which is beneficial to achieving a low distortion effect.

[0075] In an exemplary embodiment, the imaging lens satisfies: 0.75≤f9 / f≤0.94, where f9 is the effective focal length of the ninth lens and f is the total effective focal length of the imaging lens. By properly setting the focal length ratio of the ninth lens to the imaging lens, a positive spherical aberration is generated to compensate for the negative spherical aberration generated by other lenses, which is conducive to achieving a high resolution effect while satisfying the non-thermal effect.

[0076] In an exemplary embodiment, the imaging lens satisfies: -0.71≤f10 / f≤-0.6, where f10 is the effective focal length of the tenth lens, and f is the total effective focal length of the imaging lens. By setting the tenth lens of the imaging lens to have a negative focal power, it is beneficial to raise the light, increase the image plane and back focus length of the imaging lens, and thus achieve a large target surface and long back focus effect; at the same time, the focal length ratio of the tenth lens to the imaging lens is reasonably set to produce smaller coma, field curvature and vertical axis chromatic aberration, which is beneficial to achieve a high resolution effect.

[0077] In an exemplary embodiment, the imaging lens satisfies: 0.76≤f11 / f≤0.83, where f11 is the effective focal length of the eleventh lens, and f is the total effective focal length of the imaging lens. By properly setting the focal length ratio of the eleventh lens to the imaging lens, positive spherical aberration is generated to compensate for the negative spherical aberration generated by other lenses, which is conducive to achieving a high resolution effect.

[0078] In an exemplary embodiment, the imaging lens may include multiple groups of cemented lenses, for example, the first cemented lens B21 and the second cemented lens B22 in the second lens group B2 may form a double cemented lens, the third lens L3 and the fourth lens L4 may form a double cemented lens, the fifth lens L5 and the sixth lens L6 may form a double cemented lens, the eighth lens L8 and the ninth lens L9 may form a double cemented lens, the tenth lens L10 and the eleventh lens L11 may form a double cemented lens, or the eighth lens L8 to the eleventh lens L11 may form a quadruple cemented lens, etc. The use of cemented lenses is beneficial to reducing lens tolerance sensitivity, improving yield, reducing chromatic aberration, and improving resolution.

[0079] In an exemplary embodiment, the imaging lens may further include a protective glass or a color filter (CG) for protecting a photosensitive element located on an imaging surface (IMA).

[0080] In an exemplary embodiment, each lens of the imaging lens may be made of glass, which is beneficial for balancing high and low temperatures and reducing production costs.

[0081] The imaging lens according to the implementation mode of the present application can meet the requirements of low distortion, large aperture, wide object distance range, small back focal length, and small CRA, so as to be able to cope well with future market development trends.

[0082] The imaging lens according to the implementation mode of the present application has the following characteristics: low distortion, DIS (optical distortion) absolute value ≤ 9.81%, so that the imaging picture restoration is more realistic; large target surface, full image height IH ≥ 16mm; large aperture, aperture number FNO ≥ 1.10, which can improve the uniformity of the imaging picture; wide object distance range, WD (Working Distance, working distance) is 1.5m ~ inf (infinity), so that the lens can be used in a variety of scenes; no heat (-30 ° C ~ 70 ° C), so that the lens can maintain performance stability under most ambient temperatures; long back focal length, applicable to a variety of interfaces (such as C / CS, etc.); small CRA (CRA ≤ 7.533 °), can match a variety of chips.

[0083] Specific embodiments 1-6 of the imaging lens applicable to the above-mentioned embodiment will be further described below with reference to the accompanying drawings.

[0084] Example 1

[0085] The following reference Figure 1 An imaging lens according to Embodiment 1 of the present application is described.

[0086] like Figure 1 As shown, the imaging lens of this embodiment includes 12 lenses with optical power, which are arranged in order from the object side to the image side along the optical axis: a first lens L1, a first cemented lens B21, a second cemented lens B22, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10 and an eleventh lens L11.

[0087] In this embodiment, the first lens L1 has negative refractive power, the object-side surface is convex, and the image-side surface is concave.

[0088] In this embodiment, the second lens group B2 includes a cemented lens consisting of a first cemented lens B21 and a second cemented lens B22, wherein the first cemented lens B21 has negative optical power, and its object side surface and image side surface are both concave surfaces; the second cemented lens B22 has positive optical power, and its object side surface and image side surface are both convex surfaces.

[0089] In this embodiment, the third lens L3 and the fourth lens L4 can form a cemented lens, wherein the third lens L3 has positive focal power, the object side surface is convex, and the image side surface is concave; the fourth lens L4 has negative focal power, the object side surface is convex, and the image side surface is concave. At the same time, the fifth lens L5 and the sixth lens L6 can form a cemented lens, wherein the fifth lens L5 has negative focal power, and both the object side surface and the image side surface are concave; the sixth lens L6 has positive focal power, and both the object side surface and the image side surface are convex. A stop is provided between the fourth lens L4 and the fifth lens L5.

[0090] In this embodiment, the seventh lens L7 has positive refractive power, and both the object-side surface and the image-side surface thereof are convex surfaces.

[0091] In this embodiment, the eighth lens L8 has negative focal power, the object side surface is convex, and the image side surface is concave; the ninth lens L9 has positive focal power, and both the object side surface and the image side surface are convex; the tenth lens L10 has negative focal power, and both the object side surface and the image side surface are concave; the eleventh lens L11 has positive focal power, and both the object side surface and the image side surface are convex.

[0092] In this embodiment, the eighth lens L8 to the eleventh lens L11 may form a quadruple cemented lens.

[0093] In this embodiment, the imaging lens may further include a filter CG for protecting the photosensitive element located on the imaging surface (IMA). Light from an object passes through each of the optical surfaces surf1 to surf21 in sequence and is finally imaged on the imaging surface surf22.

[0094] Table 1 shows some basic parameters of each lens of the imaging lens of this embodiment, including surface type, curvature radius, thickness, refractive index of the material, and Abbe number, wherein the units of curvature radius and thickness / distance are all millimeters (mm).

[0095]

[0096]

[0097] Table 1

[0098] According to the imaging lens of Example 1 of the present application, the aperture number FNO=1.20, the total image height IH is 17.706 mm, and the main light angle CRA=6.087°.

[0099] Figure 2 The optical distortion curve of the imaging lens of Example 1 is shown as follows: Figure 2 As shown, the absolute value of the optical distortion DIS of the imaging lens is less than 8.87%. Therefore, the imaging lens provided in Example 1 can achieve low distortion and has good aberration correction capability, and can present good imaging quality.

[0100] Example 2

[0101] The following reference Figure 3 An imaging lens according to Embodiment 2 of the present application is described. In Embodiment 2 and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0102] like Figure 3 As shown, the imaging lens of this embodiment includes 11 lenses with optical power, which are arranged in sequence from the object side to the image side along the optical axis: a first lens L1, a second lens L2 (second lens group B2), a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10 and an eleventh lens L11.

[0103] In this embodiment, the second lens group B2 includes a second lens L2, which has negative optical power, a concave object side surface, and a convex image side surface. By properly setting the optical power and shape of the second lens L2, the deflection of light passing through the second lens group B2 can be reduced, which is conducive to correcting the distortion of the imaging lens, thereby achieving a low distortion effect.

[0104] In this embodiment, except for the second lens group B2, the refractive power and surface shape of other lenses having refractive power (the first lens L1, and the third lens L3 to the eleventh lens L11) are the same as those in the aforementioned embodiment 1. The specific description of the characteristics of each lens can be referred to the aforementioned embodiment 1, which will not be repeated here.

[0105] Table 2 shows some basic parameters of each lens of the imaging lens of this embodiment, including surface type, curvature radius, thickness, refractive index of the material, and Abbe number, wherein the units of curvature radius and thickness / distance are all millimeters (mm).

[0106]

[0107]

[0108] Table 2

[0109] According to the imaging lens of Example 2 of the present application, the aperture number FNO=1.29, the total image height IH is 17.710 mm, and the main light angle CRA=5.813°.

[0110] Figure 4 The optical distortion curve of the imaging lens of Example 2 is shown as follows: Figure 4 As shown, the absolute value of the optical distortion DIS of the imaging lens is less than 8.40%. Therefore, the imaging lens provided in Example 2 can achieve low distortion and has good aberration correction capability, and can present good imaging quality.

[0111] Example 3

[0112] The following reference Figure 5 An imaging lens according to Embodiment 3 of the present application is described.

[0113] like Figure 5 As shown, the imaging lens of this embodiment includes 12 lenses with optical power, which are arranged in order from the object side to the image side along the optical axis: a first lens L1, a first cemented lens B21, a second cemented lens B22, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10 and an eleventh lens L11.

[0114] In this embodiment, the second lens group B2 includes a cemented lens consisting of a first cemented lens B21 and a second cemented lens B22, wherein the first cemented lens B21 has negative optical power, its object side surface is concave, and its image side surface is convex; the second cemented lens B22 has positive optical power, its object side surface is concave, and its image side surface is convex.

[0115] In this embodiment, except for the second lens group B2, the refractive power and surface shape of other lenses having refractive power (the first lens L1, and the third lens L3 to the eleventh lens L11) are the same as those in the aforementioned embodiment 1. The specific description of the characteristics of each lens can be referred to the aforementioned embodiment 1, which will not be repeated here.

[0116] Table 3 shows some basic parameters of each lens of the imaging lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, and Abbe number, wherein the units of radius of curvature and thickness / distance are all millimeters (mm).

[0117]

[0118]

[0119] Table 3

[0120] According to the imaging lens of Example 3 of the present application, the aperture number FNO=1.21, the total image height IH is 17.517 mm, and the main light angle CRA=4.925°.

[0121] Figure 6 The optical distortion curve of the imaging lens of Example 3 is shown as follows: Figure 6 As shown, the absolute value of the optical distortion DIS of the imaging lens is less than 8.58%. Therefore, the imaging lens provided in Example 3 can achieve low distortion and has good aberration correction capability, and can present good imaging quality.

[0122] Example 4

[0123] The following reference Figure 7 An imaging lens according to Embodiment 4 of the present application is described.

[0124] like Figure 7 As shown, the imaging lens of this embodiment includes 12 lenses with optical power, which are arranged in order from the object side to the image side along the optical axis: a first lens L1, a first cemented lens B21, a second cemented lens B22, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10 and an eleventh lens L11.

[0125] Different from the aforementioned embodiment 1, in this embodiment, the eighth lens L8 and the ninth lens L9 form a doublet lens, and the ninth lens L9 and the tenth lens L10 form a doublet lens.

[0126] In this embodiment, the power and surface shape of each lens (first lens L1, and third lens L3 to eleventh lens L11) are the same as those in the aforementioned embodiment 1, and the number of lenses included in the second lens group B2, and the power and surface shape of each lens in the second lens group B2 (first cemented lens B21 and second cemented lens B22) are the same as those in the aforementioned embodiment 1. The specific description of the features of each lens and lens group can be referred to the aforementioned embodiment 1, which will not be repeated here.

[0127] Table 4 shows some basic parameters of each lens of the imaging lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number, wherein the units of radius of curvature and thickness / distance are all millimeters (mm).

[0128]

[0129]

[0130] Table 4

[0131] According to the imaging lens of Example 4 of the present application, the aperture number FNO=1.20, the total image height IH is 16.595 mm, and the main light angle CRA=5.067°.

[0132] Figure 8 The optical distortion curve of the imaging lens of Example 4 is shown as follows: Figure 8 As shown, the absolute value of the optical distortion DIS of the imaging lens is less than 7.29%. Therefore, the imaging lens provided in Example 4 can achieve low distortion and has good aberration correction capability, and can present good imaging quality.

[0133] Example 5

[0134] The following reference Fig. 9 An imaging lens according to Embodiment 5 of the present application is described.

[0135] like Fig. 9 As shown, the imaging lens of this embodiment includes 12 lenses with optical power, which are arranged in order from the object side to the image side along the optical axis: a first lens L1, a first cemented lens B21, a second cemented lens B22, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10 and an eleventh lens L11.

[0136] In this embodiment, the power and surface shape of each lens (first lens L1, and third lens L3 to eleventh lens L11) are the same as those in the aforementioned embodiment 1, and the number of lenses included in the second lens group B2, and the power and surface shape of each lens in the second lens group B2 (first cemented lens B21 and second cemented lens B22) are the same as those in the aforementioned embodiment 1. The specific description of the features of each lens and lens group can be referred to the aforementioned embodiment 1, which will not be repeated here.

[0137] Table 5 shows some basic parameters of each lens of the imaging lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, and Abbe number, wherein the units of radius of curvature and thickness / distance are all millimeters (mm).

[0138]

[0139]

[0140] Table 5

[0141] According to the imaging lens of Example 5 of the present application, the aperture number FNO=1.20, the total image height IH is 18.992 mm, and the main light angle CRA=7.533°.

[0142] Fig.10 The optical distortion curve of the imaging lens of Example 5 is shown as follows: Fig.10 As shown, the absolute value of the optical distortion DIS of the imaging lens is less than 9.81%. Therefore, the imaging lens provided in Example 5 can achieve low distortion and has good aberration correction capability, and can present good imaging quality.

[0143] Example 6

[0144] The following reference Fig.11 An imaging lens according to Embodiment 6 of the present application is described.

[0145] like Fig.11 As shown, the imaging lens of this embodiment includes 12 lenses with optical power, which are arranged in order from the object side to the image side along the optical axis: a first lens L1, a first cemented lens B21, a second cemented lens B22, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10 and an eleventh lens L11.

[0146] In this embodiment, the third lens L3 and the fourth lens L4 form a cemented lens, wherein the third lens L3 has positive focal power, and both the object side and the image side are convex; the fourth lens L4 has negative focal power, and both the object side and the image side are concave. At the same time, the fifth lens L5 and the sixth lens L6 form a cemented lens, wherein the fifth lens L5 has negative focal power, and both the object side and the image side are concave; the sixth lens L6 has positive focal power, and both the object side and the image side are convex. A stop is provided between the fourth lens L4 and the fifth lens L5.

[0147] In this embodiment, the second lens group B2 includes a cemented lens consisting of a first cemented lens B21 and a second cemented lens B22, wherein the optical power and surface shape of the first cemented lens B21 and the second cemented lens B22 are the same as those in the aforementioned embodiment 1. For details, please refer to the description in embodiment 1, which will not be repeated here.

[0148] In this embodiment, the optical power and surface shape of the first lens L1, and the seventh lens L7 to the eleventh lens L11 are the same as those in the aforementioned embodiment 1. The specific description of the characteristics of each lens can be referred to the aforementioned embodiment 1, which will not be repeated here.

[0149] Table 6 shows some basic parameters of each lens of the imaging lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, and Abbe number, wherein the units of radius of curvature and thickness / distance are all millimeters (mm).

[0150]

[0151]

[0152] Table 6

[0153] According to the imaging lens of Example 6 of the present application, the aperture number FNO=1.20, the total image height IH is 17.705 mm, and the main light angle CRA=6.170°.

[0154] Fig.12 The optical distortion curve of the imaging lens of Example 6 is shown as follows: Fig.12 As shown, the absolute value of the optical distortion DIS of the imaging lens is less than 8.45%. Therefore, the imaging lens provided in Example 6 can achieve low distortion and has good aberration correction capability, and can present good imaging quality.

[0155] In summary, the lenses in the above-mentioned embodiments 1 to 6 respectively satisfy the conditional expressions shown in Table 7 below.

[0156]

[0157]

[0158] Table 7

[0159] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a 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 concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. An imaging lens, characterized in that: Along the optical axis from the object side to the image side, they include: a first lens having negative optical power; A second lens group includes at least one lens; a third lens having positive refractive power; a fourth lens having negative optical power; Aperture; a fifth lens having negative optical power; a sixth lens having positive refractive power; a seventh lens having positive refractive power; an eighth lens having negative optical power; a ninth lens having positive refractive power; a tenth lens having negative optical power; and an eleventh lens having positive refractive power; The overall image height IH of the imaging lens, the total effective focal length f of the imaging lens, and the aperture number FNO of the imaging lens satisfy: 0.53≤IH / f / FNO≤0.

68.

2. The imaging lens according to claim 1, wherein: The object side surface of the first lens is convex, and the image side surface is concave; The object side surface of the lens closest to the object side in the second lens group is concave, and the image side surface of the lens closest to the image side is convex; The object side surface of the third lens is a convex surface; The image side surface of the fourth lens is a concave surface; The object side surface and the image side surface of the fifth lens are both concave surfaces; The object side surface and the image side surface of the sixth lens are both convex surfaces; The object side surface and the image side surface of the seventh lens are both convex surfaces; The object side surface of the eighth lens is convex, and the image side surface is concave; The object side surface and the image side surface of the ninth lens are both convex surfaces; The object side surface and the image side surface of the tenth lens are both concave surfaces; and The object side surface and the image side surface of the eleventh lens are both convex surfaces.

3. The imaging lens according to claim 1, wherein: The second lens group includes a second lens with negative optical power. The object side surface of the second lens is a concave surface, and the image side surface is a convex surface.

4. The imaging lens according to claim 1, wherein: The second lens group includes a first glued lens and a second glued lens, wherein the first glued lens and the second glued lens form a glued lens; wherein the first glued lens has negative optical power, and its object side surface is concave; and the second glued lens has positive optical power, and its image side surface is convex.

5. The imaging lens according to claim 4, wherein: The curvature radius R21 of the object side surface and the curvature radius R22 of the image side surface of the first glued lens, and the curvature radius R31 of the object side surface and the curvature radius R32 of the image side surface of the second glued lens satisfy: -0.01≤(R21 / R22) / (R31 / R32)≤0.

04.

6. The imaging lens according to claim 4, wherein: The effective focal length fB21 of the first bonded lens and the effective focal length fB22 of the second bonded lens satisfy: -1.03≤fB22 / fB21≤-0.

88.

7. The imaging lens according to any one of claims 1 to 6, wherein: The eighth lens to the eleventh lens form a quadruple-cemented lens, and the effective focal length fB4 of the quadruple-cemented lens and the total effective focal length f of the imaging lens satisfy: 2.09≤fB4 / f≤2.

91.

8. The imaging lens according to any one of claims 1 to 6, wherein: The effective focal length f1 of the first lens and the total effective focal length f of the imaging lens satisfy: -3.46≤f1 / f≤-2.

43.

9. The imaging lens according to any one of claims 1 to 6, wherein: The effective focal length f7 of the seventh lens and the total effective focal length f of the imaging lens satisfy: 1.28≤f7 / f≤2.

23.

10. The imaging lens according to any one of claims 1 to 6, wherein: The imaging lens satisfies one of the following conditions: -62.34≤(R81+R82) / (R101+R102)≤-2.4; 0.27≤BFL / TTL≤0.29; 1.14≤f3 / f≤1.62; -1.66≤f4 / f≤-1.19; -0.85≤ f5 / f≤-0.62; 0.86≤f6 / f≤1.14; -1.84≤f8 / f≤-1.28; 0.75≤f9 / f≤0.94; -0.71≤f10 / f≤-0.6; 0.76≤f11 / f≤0.83; Among them, R81 is the curvature radius of the object side surface of the eighth lens, R82 is the curvature radius of the image side surface of the eighth lens, R101 is the curvature radius of the object side surface of the tenth lens, R102 is the curvature radius of the image side surface of the tenth lens, BFL is the optical back focal length of the imaging lens, TTL is the total optical length of the imaging lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f8 is the effective focal length of the eighth lens, f9 is the effective focal length of the ninth lens, f10 is the effective focal length of the tenth lens, f11 is the effective focal length of the eleventh lens, and f is the total effective focal length of the imaging lens.

Images