Imaging lens

Abstract

This application discloses an imaging lens that, along the optical axis from the object side to the image side, sequentially includes: a first lens having negative optical power; a second lens group including at least one lens; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens having negative optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; an eighth lens having negative optical power; a ninth lens having positive optical power; a tenth lens having negative optical power; and an eleventh lens having positive optical power.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an imaging lens. Background Technology

[0002] With the development of modern economic construction and management, the demand for road monitoring is increasing, and at the same time, more requirements are being placed on the cameras used in its monitoring.

[0003] The intelligent traffic cameras currently on the market have the following shortcomings:

[0004] 1. Significant lens distortion results in unrealistic image reproduction;

[0005] 2. The lens aperture is relatively small, resulting in poor image uniformity;

[0006] 3. The lens has a narrow working distance, which makes it unsuitable for certain usage scenarios;

[0007] 4. Existing lenses have a short back focal length, making them unsuitable for various interfaces;

[0008] 5. Existing lenses have a large CRA (Chief Ray Angle), which cannot be matched with many different chips.

[0009] In summary, current intelligent transportation lenses suffer from significant distortion, small aperture, narrow applicable object distance range, and short back focal length, making them unsuitable for various scenarios. Furthermore, their large CRA (Cost Aspect Ratio) makes them ill-suited to future market trends. Summary of the Invention

[0010] An imaging lens is provided according to an embodiment of this application, comprising, in sequence along the optical axis from the object side to the image side: a first lens having negative optical power; a second lens group including at least one lens; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens having negative optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; an eighth lens having negative optical power; a ninth lens having positive optical power; a tenth lens having negative optical power; and an eleventh lens having positive optical power.

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

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

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

[0014] In some embodiments, the curvature radius R21 of the object side and the curvature radius R22 of the image side of the first cemented lens, and the curvature radius R31 of the object side and the curvature radius R32 of the image side 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 to eleventh lenses form a cemented four-layer lens, and the effective focal length fB4 of the cemented four-layer lens and the total effective focal length f of the imaging lens satisfy: 2.09≤fB4 / f≤2.91.

[0017] In some implementations, 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 satisfy: 0.53≤IH / f / FNO≤0.68.

[0018] In some implementations, 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.

[0019] In some embodiments, the curvature radius R81 of the object side and the curvature radius R82 of the image side of the eighth lens, and the curvature radius R101 of the object side and the curvature radius R102 of the image side of the tenth lens satisfy: -62.34≤(R81+R82) / (R101+R102)≤-2.4.

[0020] In some implementations, the optical back focal length (BFL) of the imaging lens and the total optical length (TTL) of the imaging lens satisfy the following condition: 0.27 ≤ BFL / TTL ≤ 0.29.

[0021] In some implementations, 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.

[0022] In some implementations, 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.

[0023] In some implementations, 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.

[0024] In some implementations, the effective focal length f6 of the sixth lens and the total effective focal length f of the imaging lens satisfy the condition: 0.86 ≤ f6 / f ≤ 1.14.

[0025] In some implementations, 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.

[0026] In some implementations, 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.

[0027] In some implementations, the effective focal length f9 of the ninth lens and the total effective focal length f of the imaging lens satisfy the condition: 0.75≤f9 / f≤0.94.

[0028] In some implementations, 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.

[0029] In some implementations, 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.

[0030] The imaging lens provided according to the embodiments of this application, through the allocation of optical power and surface design of each lens, can achieve a large aperture on the one hand, and can effectively correct chromatic aberration, aberration, and distortion on the other hand, thus meeting at least one of the design requirements of low distortion, large aperture, wide range of applicable object distances, long back focal length, and small CRA. The imaging lens provided by this application can be applied, for example, to intelligent traffic lenses to meet the market development needs of road monitoring. Attached Figure Description

[0031] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0032] Figure 1 A schematic diagram of the imaging lens according to Embodiment 1 of this application is shown;

[0033] Figure 2 The optical distortion curve of the imaging lens according to Embodiment 1 of this application is shown;

[0034] Figure 3 A schematic diagram of the imaging lens according to Embodiment 2 of this application is shown;

[0035] Figure 4 The optical distortion curve of the imaging lens according to Embodiment 2 of this application is shown;

[0036] Figure 5 A schematic diagram of the imaging lens according to Embodiment 3 of this application is shown;

[0037] Figure 6 The optical distortion curve of the imaging lens according to Embodiment 3 of this application is shown;

[0038] Figure 7 A schematic diagram of the imaging lens according to Embodiment 4 of this application is shown;

[0039] Figure 8 The optical distortion curve of the imaging lens according to Embodiment 4 of this application is shown;

[0040] Figure 9 A schematic diagram of the imaging lens according to Embodiment 5 of this application is shown;

[0041] Figure 10 The optical distortion curve of the imaging lens according to Embodiment 5 of this application is shown;

[0042] Figure 11 A schematic diagram of the imaging lens according to Embodiment 6 of this application is shown; and

[0043] Figure 12 The optical distortion curve of the imaging lens according to Embodiment 6 of this application is shown. Detailed Implementation

[0044] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to 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.

[0045] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the first lens.

[0046] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0047] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0048] It should also be understood that the terms "comprising," "including," "having," "containing," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0049] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0050] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application.

[0051] The features, principles and other aspects of this application are described in detail below.

[0052] refer to Figure 1 As shown, according to an embodiment of this application, an imaging lens is provided, comprising the following lenses arranged sequentially along the optical axis from the object side to the image side: a first lens L1, a 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.

[0053] In an exemplary embodiment, the first lens L1 may have negative optical power, with its object-side surface being convex and its image-side surface being concave. By setting the first lens of the imaging lens to negative optical 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.

[0054] In some exemplary embodiments, the second lens group B2 includes at least one lens, such as the second lens L2, which may have negative optical power, with its object side being concave and its image side being convex.

[0055] In some other exemplary embodiments, the second lens group B2 may include a first cemented lens B21 and a second cemented lens B22, which together form a cemented lens. The first cemented lens B21 may have negative optical power, and its object-side surface may be concave; the second cemented lens B22 may have positive optical power, and its image-side surface may be convex. By rationally setting the optical power and shape of each lens in the second lens group, the refraction of light passing through the second lens group can be reduced, which is beneficial for correcting the distortion of the imaging lens, thereby achieving a low-distortion effect.

[0056] In an exemplary embodiment, the third lens L3 may have positive optical power, and its object-side surface may be convex; the fourth lens L4 may have negative optical power, and its image-side surface may be concave; the fifth lens L5 may have negative optical power, and both its object-side and image-side surfaces are concave; the sixth lens L6 may have positive optical power, and both its object-side and image-side surfaces are convex. By reasonably setting the optical power and shape of the third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 of the imaging lens, a double Gaussian symmetrical structure is formed, thereby achieving a wide range of usable object distances. Furthermore, by reasonably using a material with a refractive index temperature coefficient (e.g., the refractive index temperature coefficient dn / dT of the sixth lens is -3.5 to -3.1), and by reasonably setting the optical power and shape of the sixth lens, it is beneficial to achieve a lens without pyrolysis.

[0057] In an exemplary embodiment, the seventh lens L7 may have positive optical power, and both its object-side and image-side surfaces are convex. By reasonably setting the optical 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 smaller coma and thus achieving high resolution.

[0058] In an exemplary embodiment, the eighth lens L8 may have negative optical power, with its object-side surface being convex and its image-side surface being concave. By reasonably setting the optical power and shape of the eighth lens, it is beneficial to raise the light rays, increase the image plane and back focal length of the imaging lens, thereby achieving a large target area and a long back focal length effect.

[0059] In an exemplary embodiment, the ninth lens L9 may have positive optical power, and both its object-side and image-side surfaces are convex. By appropriately using a material with a refractive index temperature coefficient, such as the ninth lens having a refractive index temperature coefficient dn / dT of -7.7 to -7.0, and by appropriately setting the optical power and shape of the ninth lens, it is beneficial to achieve a lens without heat generation.

[0060] In an exemplary embodiment, the tenth lens L10 has a negative optical power, and both its object-side and image-side surfaces are concave. Properly setting the optical power and shape of the tenth lens helps to elevate the light rays, increase the image plane and back focal length of the imaging lens, thereby achieving a large target area and a long back focal length effect.

[0061] In an exemplary embodiment, the eleventh lens L11 has positive optical power, and both its object-side and image-side surfaces are convex. By appropriately setting the shape of the image-side surface of the eleventh lens of the imaging lens to match the shape of the object-side surface of the third lens, they jointly compensate for the spherical aberration generated by other lenses, which is beneficial to achieving a high resolution effect.

[0062] 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 radii of curvature of the object-side and image-side surfaces of the first cemented lens B21, respectively, and R31 and R32 are the radii of curvature of the object-side and image-side surfaces of the second cemented lens B22, respectively. By reasonably controlling the radii of curvature of the first cemented lens B21 and the second cemented lens B22, light can smoothly transition from the object-side surface of the first cemented lens B21 to the image-side surface of the second cemented lens B22, which is beneficial for correcting the distortion of the imaging lens and achieving a low distortion effect.

[0063] In an exemplary embodiment, the cemented lens in the second lens group B2 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 reasonably 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 for correcting the distortion of the imaging lens and achieving a low distortion effect.

[0064] In an exemplary embodiment, the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11 form a cemented four-lens system. This cemented four-lens system satisfies the condition: 2.09 ≤ fB4 / f ≤ 2.91, where fB4 is the effective focal length of the cemented four-lens system and f is the total effective focal length of the imaging lens. Using a cemented four-lens system can reduce chromatic aberration, which is beneficial for achieving high resolution. Furthermore, by reasonably controlling the ratio of the focal length of the cemented four-lens system to the focal length of the imaging lens, it is beneficial for reducing the upper and lower rays in the maximum field of view, achieving a smaller CRA effect.

[0065] In some other exemplary embodiments, the eighth lens L8 can also form a cemented doublet with the ninth lens L9, and the tenth lens L10 can form a cemented doublet with the eleventh lens L11.

[0066] 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 reasonably controlling the relationship between the image height, effective focal length, and aperture of the imaging lens, it is beneficial to balance the relationship between image height and aperture, achieve image quality balance, and enable the imaging lens to achieve a large aperture effect at a certain image height.

[0067] 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 an appropriate optical power, it is beneficial to increase the entrance pupil diameter of the imaging lens, increase the aperture of the imaging lens, and achieve a large aperture effect.

[0068] 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., the object-side surface) of the eighth lens, R82 is the radius of curvature of the second surface (e.g., the image-side surface) of the eighth lens, R101 is the radius of curvature of the first surface (e.g., the object-side surface) of the tenth lens, and R102 is the radius of curvature of the second surface (e.g., the image-side surface) of the tenth lens. By reasonably controlling the parameter relationship of the radii of curvature of the eighth and tenth lenses of the imaging lens, it is beneficial to increase the image plane and back focal length of the imaging lens, achieving a large image plane and long back focal length effect.

[0069] In an exemplary embodiment, the imaging lens satisfies: 0.27 ≤ BFL / TTL ≤ 0.29, where BFL is the optical back focal 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 focal length to the total optical length, the imaging lens can achieve a long back focal length effect with a certain total optical length, thus making it suitable for various interfaces.

[0070] 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 reasonably setting the focal length ratio between the third lens and the optical lens, the deflection of light passing through the third lens can be reduced, resulting in less distortion and achieving a low-distortion effect.

[0071] 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 reasonably setting the focal length ratio between the fourth lens and the imaging lens, positive spherical aberration is generated to compensate for the positive spherical aberration generated by the third lens, which is beneficial to achieving high resolution.

[0072] 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 reasonably setting the focal length ratio between the fifth lens and the imaging lens, a smaller magnification chromatic aberration is achieved, which is beneficial for realizing high resolution.

[0073] 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 reasonably setting the focal length ratio between the sixth lens and the imaging lens, a smaller transverse chromatic aberration is achieved, which is beneficial to achieve high resolution while satisfying the requirement of no pyrolysis.

[0074] 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 reasonably setting the focal length ratio of the seventh lens to the imaging lens, a smaller coma is produced, which is beneficial to achieving high resolution.

[0075] 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 a negative optical power, it is beneficial to raise the light beam, increase the image plane and back focal length of the imaging lens, thereby achieving a large target area and a long back focal length effect. At the same time, by reasonably setting the focal length ratio of the eighth lens to the imaging lens, it produces a smaller field curvature, which is beneficial to achieving a high resolution effect. Moreover, it can reduce the deflection of light passing through the eighth lens, resulting in a smaller distortion and thus achieving a low distortion effect.

[0076] 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 reasonably setting the focal length ratio between the ninth lens and the imaging lens, positive spherical aberration is generated to compensate for the negative spherical aberration generated by other lenses, which is beneficial to achieve high resolution while satisfying the requirement of no pyrolysis.

[0077] 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 a negative optical power, it is beneficial to raise the light beam, increase the image plane and back focal length of the imaging lens, thereby achieving a large target area and a long back focal length effect; at the same time, by reasonably setting the focal length ratio of the tenth lens to the imaging lens, it produces smaller coma, field curvature and transverse chromatic aberration, which is beneficial to achieving high resolution.

[0078] 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 reasonably setting the focal length ratio between the eleventh lens and the imaging lens, positive spherical aberration is generated to compensate for the negative spherical aberration generated by other lenses, which is beneficial to achieving high resolution.

[0079] In an exemplary embodiment, the imaging lens may include multiple sets of cemented lenses. For example, the first cemented lens B21 and the second cemented lens B22 in the second lens group B2 can form a cemented doublet lens; the third lens L3 and the fourth lens L4 can form a cemented doublet lens; the fifth lens L5 and the sixth lens L6 can form a cemented doublet lens; the eighth lens L8 and the ninth lens L9 can form a cemented doublet lens; the tenth lens L10 and the eleventh lens L11 can form a cemented doublet lens; or the eighth lens L8 to the eleventh lens L11 can form a cemented quadruple lens, etc. Using cemented lenses helps to reduce lens tolerance sensitivity, improve yield, reduce chromatic aberration, and improve resolution.

[0080] In an exemplary embodiment, the imaging lens may further include an aperture stop (STO), for example, the aperture stop may be disposed between the fourth lens L4 and the fifth lens L5, with its position fixed relative to the imaging plane (IMA). Distributing the aperture stop here facilitates the formation of a double Gaussian symmetrical structure between the lenses or lens groups before and after the aperture stop, thereby achieving a wide range of usable object distances.

[0081] In an exemplary embodiment, the imaging lens may further include a protective glass or a filter (CG) for protecting the photosensitive element located on the imaging plane (IMA).

[0082] In an exemplary embodiment, each lens of the imaging lens can be made of glass, which helps to balance high and low temperatures and reduce production costs.

[0083] The imaging lens according to the embodiments of this application can meet the usage requirements of low distortion, large aperture, wide range of applicable object distances, long back focal length, and small CRA, thus being able to well cope with future market development trends.

[0084] The imaging lens according to the embodiments of this application has the following characteristics: low distortion, with an absolute value of DIS (optical distortion) ≤ 9.81%, resulting in more realistic image reproduction; large target area, with a holographic height IH ≥ 16mm; large aperture, with an aperture number FNO ≥ 1.10, which can improve the uniformity of the image; wide working distance range, with a WD (working distance) of 1.5m to inf (infinity), making the lens suitable for various scenarios; no pyrolysis (-30℃ to 70℃), allowing the lens to maintain performance stability in most ambient temperatures; long back focal length, compatible with various interfaces (such as C / CS); and small CRA (CRA ≤ 7.533°), compatible with various chips.

[0085] The following describes in further detail, with reference to the accompanying drawings, specific embodiments 1-6 of the imaging lens applicable to the above embodiments.

[0086] Example 1

[0087] The following is for reference Figure 1 The imaging lens according to Embodiment 1 of this application is described.

[0088] like Figure 1 As shown, the imaging lens of this embodiment includes a total of 11 lenses with optical power, which are arranged in sequence from the object side to the image side along the optical axis: first lens L1, second lens L2 (second lens group B2), third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, ninth lens L9, tenth lens L10 and eleventh lens L11.

[0089] In this embodiment, the first lens L1 has negative optical power, the object side is convex, and the image side is concave.

[0090] In this embodiment, the second lens group B2 includes a second lens L2, which has negative optical power, a concave object side, and a convex image side.

[0091] In this embodiment, the third lens L3 and the fourth lens L4 can form a cemented lens, wherein the third lens L3 has positive optical power, a convex object-side surface, and a concave image-side surface; the fourth lens L4 has negative optical power, a convex object-side surface, and a concave image-side surface. Simultaneously, the fifth lens L5 and the sixth lens L6 can form a cemented lens, wherein the fifth lens L5 has negative optical power, and both its object-side and image-side surfaces are concave; the sixth lens L6 has positive optical power, and both its object-side and image-side surfaces are convex. An aperture stop is provided between the fourth lens L4 and the fifth lens L5.

[0092] In this embodiment, the seventh lens L7 has positive optical power, and both its object side and image side are convex.

[0093] In this embodiment, the eighth lens L8 has negative optical power, the object side is convex, and the image side is concave; the ninth lens L9 has positive optical power, and both the object side and the image side are convex; the tenth lens L10 has negative optical power, and both the object side and the image side are concave; the eleventh lens L11 has positive optical power, and both the object side and the image side are convex.

[0094] Furthermore, in this embodiment, the eighth lens L8 to the eleventh lens L11 can form a four-colloidal lens.

[0095] 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 the object passes sequentially through the optical surfaces surf1 to surf20 and is finally imaged on the imaging surface surf21.

[0096] Table 1 shows some basic parameters of each lens in the imaging lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number. The units for radius of curvature and thickness / distance are millimeters (mm).

[0097]

[0098]

[0099] Table 1

[0100] According to Embodiment 1 of this application, the imaging lens has an aperture number FNO = 1.29, a holographic height IH of 17.710 mm, and a principal angle CRA = 5.813°.

[0101] Figure 2 The optical distortion curve of the imaging lens of Embodiment 1 is shown, as follows: Figure 2 As shown, the absolute value of optical distortion (DIS) of the imaging lens is less than 8.40%. Therefore, the imaging lens given in Example 1 can achieve low distortion while having good aberration correction capability, and can present good image quality.

[0102] Example 2

[0103] The following is for reference Figure 3 An imaging lens according to Embodiment 2 of this application is described. In Embodiment 2 and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted.

[0104] like Figure 3 As shown, the imaging lens of this embodiment includes a total of 12 lenses with optical power, which are arranged in sequence from the object side to the image side along the optical axis: first lens L1, first cemented lens B21, second cemented lens B22, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, ninth lens L9, tenth lens L10 and eleventh lens L11.

[0105] In this embodiment, the second lens group B2 includes a cemented lens composed of a first cemented lens B21 and a second cemented lens B22. The first cemented lens B21 has negative optical power, with its object side being concave and its image side being convex. The second cemented lens B22 has positive optical power, with its object side being concave and its image side being convex.

[0106] In this embodiment, except for the second lens group B2, the optical power and surface shape of the other lenses with optical 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. For a detailed description of the characteristics of each lens, please refer to the aforementioned embodiment 1, which will not be repeated here.

[0107] Table 2 shows some basic parameters of each lens in the imaging lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number. The units for radius of curvature and thickness / distance are millimeters (mm).

[0108]

[0109]

[0110] Table 2

[0111] According to Embodiment 2 of this application, the imaging lens has an aperture number FNO = 1.21, a holographic height IH of 17.517 mm, and a principal angle CRA = 4.925°.

[0112] Figure 4 The optical distortion curve of the imaging lens in Embodiment 2 is shown, as follows: Figure 4 As shown, the absolute value of optical distortion (DIS) of the imaging lens is less than 8.58%. Therefore, the imaging lens given in Example 2 can achieve low distortion while having good aberration correction capability, and can present good image quality.

[0113] Example 3

[0114] The following is for reference Figure 5 The imaging lens according to Embodiment 3 of this application is described.

[0115] like Figure 5 As shown, the imaging lens of this embodiment includes a total of 12 lenses with optical power, which are arranged in sequence from the object side to the image side along the optical axis: first lens L1, first cemented lens B21, second cemented lens B22, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, ninth lens L9, tenth lens L10 and eleventh lens L11.

[0116] In this embodiment, the second lens group B2 includes a cemented lens composed of a first cemented lens B21 and a second cemented lens B22. The first cemented lens B21 has negative optical power, and both its object-side and image-side surfaces are concave. The second cemented lens B22 has positive optical power, and both its object-side and image-side surfaces are convex. By rationally setting the optical power and shape of each lens in the second lens group B2, the deflection of light passing through the second lens group B2 can be reduced, which is beneficial for correcting the distortion of the imaging lens, thereby achieving a low-distortion effect.

[0117] In this embodiment, except for the second lens group B2, the optical power and surface shape of the other lenses with optical 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. For a detailed description of the characteristics of each lens, please refer to the aforementioned embodiment 1, which will not be repeated here.

[0118] Table 3 shows some basic parameters of each lens in the imaging lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number. The units for radius of curvature and thickness / distance are millimeters (mm).

[0119]

[0120]

[0121] Table 3

[0122] According to the imaging lens of Embodiment 3 of this application, the aperture number FNO = 1.21, the holographic height IH is 17.513mm, and the principal angle CRA = 5.451°.

[0123] Figure 6 The optical distortion curve of the imaging lens of Embodiment 3 is shown, as follows: Figure 6 As shown, the absolute value of optical distortion (DIS) of the imaging lens is less than 8.29%. Therefore, the imaging lens given in Example 3 can achieve low distortion while having good aberration correction capability, and can present good image quality.

[0124] Example 4

[0125] The following is for reference Figure 7 The imaging lens according to Embodiment 4 of this application is described.

[0126] like Figure 7 As shown, the imaging lens of this embodiment includes a total of 12 lenses with optical power, which are arranged in sequence from the object side to the image side along the optical axis: first lens L1, first cemented lens B21, second cemented lens B22, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, ninth lens L9, tenth lens L10 and eleventh lens L11.

[0127] Unlike the aforementioned Embodiment 3, in this embodiment, the eighth lens L8 and the ninth lens L9 form a cemented doublet, and the ninth lens L9 and the tenth lens L10 form a cemented doublet.

[0128] In this embodiment, the optical power and surface shape of each lens (first lens L1, and third lenses L3 to eleventh lenses L11) are the same as in the aforementioned embodiment 3. Furthermore, the number of lenses included in the second lens group B2, as well as the optical 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 in the aforementioned embodiment 3. For a detailed description of the characteristics of each lens and lens group, please refer to the aforementioned embodiment 3; it will not be repeated here.

[0129] Table 4 shows some basic parameters of each lens in the imaging lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number. The units for radius of curvature and thickness / distance are millimeters (mm).

[0130]

[0131] Table 4

[0132] According to the imaging lens of Embodiment 4 of this application, the aperture number FNO = 1.20, the holographic height IH is 16.595mm, and the principal angle CRA = 5.067°.

[0133] Figure 8 The optical distortion curve of the imaging lens in Example 4 is shown, as follows: Figure 8 As shown, the absolute value of optical distortion (DIS) of the imaging lens is less than 7.29%. Therefore, the imaging lens given in Example 4 can achieve low distortion while having good aberration correction capability, and can present good image quality.

[0134] Example 5

[0135] The following is for reference Figure 9 The imaging lens according to Embodiment 5 of this application is described.

[0136] like Figure 9 As shown, the imaging lens of this embodiment includes a total of 12 lenses with optical power, which are arranged in sequence from the object side to the image side along the optical axis: first lens L1, first cemented lens B21, second cemented lens B22, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, ninth lens L9, tenth lens L10 and eleventh lens L11.

[0137] In this embodiment, the optical power and surface shape of each lens (first lens L1, and third lenses L3 to eleventh lenses L11) are the same as in the aforementioned embodiment 3. Furthermore, the number of lenses included in the second lens group B2, as well as the optical 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 in the aforementioned embodiment 3. For a detailed description of the characteristics of each lens and lens group, please refer to the aforementioned embodiment 3; it will not be repeated here.

[0138] Table 5 shows some basic parameters of each lens in the imaging lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number. The units for radius of curvature and thickness / distance are millimeters (mm).

[0139]

[0140]

[0141] Table 5

[0142] According to the imaging lens of Embodiment 5 of this application, the aperture number FNO = 1.20, the holographic height IH is 18.992mm, and the principal angle CRA = 7.533°.

[0143] Figure 10 The optical distortion curve of the imaging lens of Embodiment 5 is shown, as follows: Figure 10 As shown, the absolute value of optical distortion (DIS) of the imaging lens is less than 9.81%. Therefore, the imaging lens given in Example 5 can achieve low distortion while having good aberration correction capability, and can present good image quality.

[0144] Example 6

[0145] The following is for reference Figure 11 The imaging lens according to Embodiment 6 of this application is described.

[0146] like Figure 11 As shown, the imaging lens of this embodiment includes a total of 12 lenses with optical power, which are arranged in sequence from the object side to the image side along the optical axis: first lens L1, first cemented lens B21, second cemented lens B22, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, ninth lens L9, tenth lens L10 and eleventh lens L11.

[0147] In this embodiment, the third lens L3 and the fourth lens L4 form a cemented lens, wherein the third lens L3 has positive optical power and both its object-side and image-side surfaces are convex; the fourth lens L4 has negative optical power and both its object-side and image-side surfaces are concave. Simultaneously, the fifth lens L5 and the sixth lens L6 form a cemented lens, wherein the fifth lens L5 has negative optical power and both its object-side and image-side surfaces are concave; the sixth lens L6 has positive optical power and both its object-side and image-side surfaces are convex. An aperture stop is provided between the fourth lens L4 and the fifth lens L5.

[0148] In this embodiment, the second lens group B2 includes a cemented lens composed of a first cemented lens B21 and a second cemented lens B22. 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 3. For details, please refer to the description in embodiment 3, which will not be repeated here.

[0149] In this embodiment, the optical power and surface shape of the first lens L1, as well as the seventh lens L7 to the eleventh lens L11, are the same as those in the aforementioned embodiment 3. For a detailed description of the characteristics of each lens, please refer to the aforementioned embodiment 3, which will not be repeated here.

[0150] Table 6 shows some basic parameters of each lens in the imaging lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number. The units for radius of curvature and thickness / distance are millimeters (mm).

[0151] Face number Surface type radius of curvature Thickness / Distance Refractive index Nd Abbe number Vd surf1 spherical 76.114 1.048 1.517 52.19 surf2 spherical 22.751 8.075 surf3 spherical -25.184 1.326 1.500 62.09 surf4 spherical 448.474 5.652 1.871 40.73 surf5 spherical -43.593 0.100 surf6 spherical 30.862 6.810 1.954 32.32 surf7 spherical -300.000 6.968 1.581 40.92 surf8 spherical 19.189 5.438 surf9 (STO) spherical Infinity 6.249 surf10 spherical -18.120 1.572 1.626 35.71 surf11 spherical 36.058 7.735 1.618 63.41 surf12 spherical -25.740 0.100 surf13 spherical 74.114 4.582 surf14 spherical -62.573 0.100 surf15 spherical 47.220 0.800 1.847 23.78 surf16 spherical 19.756 9.689 1.593 68.53 surf17 spherical -27.002 4.364 1.728 28.31 surf18 spherical 22.554 8.000 1.923 20.88 surf19 spherical -87.801 6.200 surf20 spherical Infinity 20.550 1.517 64.21 surf21 spherical Infinity 3.650 surf22(IMA) spherical Infinity - - -

[0152] Table 6

[0153] According to Embodiment 6 of this application, the imaging lens has an aperture number FNO = 1.20, a holographic height IH of 17.705 mm, and a principal angle CRA = 6.170°.

[0154] Figure 12 The optical distortion curve of the imaging lens of Embodiment 6 is shown, as follows: Figure 12 As shown, the absolute value of the optical distortion (DIS) of the imaging lens is less than 8.45%. Therefore, the imaging lens given in Example 6 can achieve low distortion while having good aberration correction capability, and can present good image quality.

[0155] In summary, the lenses in Embodiments 1 to 6 satisfy the conditions shown in Table 7 below.

[0156]

[0157]

[0158] Table 7

[0159] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An imaging lens, characterized in that, Along the optical axis from the object side to the image side, the sequence includes: A first lens with negative optical power; The second lens group includes a first cemented lens and a second cemented lens, the first cemented lens and the second cemented lens forming a cemented lens, wherein the first cemented lens has negative optical power and the second cemented lens has positive optical power; A third lens with positive optical power; A fourth lens with negative optical power; 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 The eleventh lens with positive optical power; The imaging lens contains twelve lenses with optical power. The effective focal length f7 of the seventh lens and the total effective focal length f of the imaging lens satisfy the following condition: 1.28 ≤ f7 / f ≤ 2.

23.

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. In the second lens group, the object-side surface of the lens closest to the object side 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. Both the object-side and image-side surfaces of the fifth lens are concave. Both the object-side and image-side surfaces of the sixth lens are convex. Both the object-side and image-side surfaces of the seventh lens are convex. The object-side surface of the eighth lens is convex, and the image-side surface is concave. Both the object-side and image-side surfaces of the ninth lens are convex. Both the object-side and image-side surfaces of the tenth lens are concave; and The object-side and image-side surfaces of the eleventh lens are both convex.

3. The imaging lens according to claim 2, wherein, The curvature radius R21 of the object side and the curvature radius R22 of the image side of the first cemented lens, and the curvature radius R31 of the object side and the curvature radius R32 of the image side of the second cemented lens satisfy: -0.01≤(R21 / R22) / (R31 / R32)≤0.

04.

4. The imaging lens according to claim 2, wherein, The effective focal length fB21 of the first cemented lens and the effective focal length fB22 of the second cemented lens satisfy the following condition: -1.03≤fB22 / fB21≤-0.

88.

5. The imaging lens according to any one of claims 1-4, wherein, The eighth to eleventh lenses form a cemented four-layer lens, and the effective focal length fB4 of the cemented four-layer lens and the total effective focal length f of the imaging lens satisfy: 2.09≤fB4 / f≤2.

91.

6. The imaging lens according to any one of claims 1-4, 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 satisfy the following condition: 0.53≤IH / f / FNO≤0.

68.

7. The imaging lens according to any one of claims 1-4, 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.

8. The imaging lens according to any one of claims 1-4, wherein, The curvature radii R81 and R82 of the object side and the image side of the eighth lens, and the curvature radii R101 and R102 of the object side and the image side of the tenth lens satisfy: -62.34≤(R81+R82) / (R101+R102)≤-2.

4.

9. The imaging lens according to any one of claims 1-4, wherein, The optical back focal length BFL of the imaging lens and the optical total length TTL of the imaging lens satisfy the following condition: 0.27≤BFL / TTL≤0.

29.

10. The imaging lens according to any one of claims 1-4, wherein, The effective focal length f3 of the third lens and the total effective focal length f of the imaging lens satisfy the following condition: 1.14≤f3 / f≤1.

62.

11. The imaging lens according to any one of claims 1-4, wherein, The effective focal length f4 of the fourth lens and the total effective focal length f of the imaging lens satisfy the following condition: -1.66≤f4 / f≤-1.

19.

12. The imaging lens according to any one of claims 1-4, wherein, The effective focal length f5 of the fifth lens and the total effective focal length f of the imaging lens satisfy the condition: -0.85≤f5 / f≤-0.

62.

13. The imaging lens according to any one of claims 1-4, wherein, The effective focal length f6 of the sixth lens and the total effective focal length f of the imaging lens satisfy the condition: 0.86≤f6 / f≤1.

14.

14. The imaging lens according to any one of claims 1-4, wherein, The effective focal length f8 of the eighth lens and the total effective focal length f of the imaging lens satisfy the following condition: -1.84≤f8 / f≤-1.

28.

15. The imaging lens according to any one of claims 1-4, wherein, The effective focal length f9 of the ninth lens and the total effective focal length f of the imaging lens satisfy the condition: 0.75≤f9 / f≤0.

94.

16. The imaging lens according to any one of claims 1-4, wherein, The effective focal length f10 of the tenth lens and the total effective focal length f of the imaging lens satisfy the following condition: -0.71≤f10 / f≤-0.

6.

17. The imaging lens according to any one of claims 1-4, wherein, The effective focal length f11 of the eleventh lens and the total effective focal length f of the imaging lens satisfy the following condition: 0.76≤f11 / f≤0.

83.

18. An imaging lens, characterized in that, Along the optical axis from the object side to the image side, the sequence includes: A first lens with negative optical power; The second lens group includes a second lens with negative optical power; A third lens with positive optical power; A fourth lens with negative optical power; 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 The eleventh lens with positive optical power; The imaging lens contains eleven lenses with optical power. The effective focal length f7 of the seventh lens and the total effective focal length f of the imaging lens satisfy the following condition: 1.28 ≤ f7 / f ≤ 2.

23.

19. The imaging lens according to claim 18, wherein, The object-side surface of the first lens is convex, and the image-side surface is concave. The object-side surface of the second lens is concave, and the image-side surface is convex. The object-side surface of the third lens is convex. The image-side surface of the fourth lens is concave. Both the object-side and image-side surfaces of the fifth lens are concave. Both the object-side and image-side surfaces of the sixth lens are convex. Both the object-side and image-side surfaces of the seventh lens are convex. The object-side surface of the eighth lens is convex, and the image-side surface is concave. Both the object-side and image-side surfaces of the ninth lens are convex. Both the object-side and image-side surfaces of the tenth lens are concave; and The object-side and image-side surfaces of the eleventh lens are both convex.

20. The imaging lens according to claim 18 or 19, wherein, The eighth to eleventh lenses form a cemented four-layer lens, and the effective focal length fB4 of the cemented four-layer lens and the total effective focal length f of the imaging lens satisfy: 2.09≤fB4 / f≤2.

91.

21. The imaging lens according to claim 18 or 19, 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 satisfy the following condition: 0.53≤IH / f / FNO≤0.

68.

22. The imaging lens according to claim 18 or 19, 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.

23. The imaging lens according to claim 18 or 19, wherein, The curvature radii R81 and R82 of the object side and the image side of the eighth lens, and the curvature radii R101 and R102 of the object side and the image side of the tenth lens satisfy: -62.34≤(R81+R82) / (R101+R102)≤-2.

4.

24. The imaging lens according to claim 18 or 19, wherein, The optical back focal length BFL of the imaging lens and the optical total length TTL of the imaging lens satisfy the following condition: 0.27≤BFL / TTL≤0.

29.

25. The imaging lens according to claim 18 or 19, wherein, The effective focal length f3 of the third lens and the total effective focal length f of the imaging lens satisfy the following condition: 1.14≤f3 / f≤1.

62.

26. The imaging lens according to claim 18 or 19, wherein, The effective focal length f4 of the fourth lens and the total effective focal length f of the imaging lens satisfy the following condition: -1.66≤f4 / f≤-1.

19.

27. The imaging lens according to claim 18 or 19, wherein, The effective focal length f5 of the fifth lens and the total effective focal length f of the imaging lens satisfy the condition: -0.85≤f5 / f≤-0.

62.

28. The imaging lens according to claim 18 or 19, wherein, The effective focal length f6 of the sixth lens and the total effective focal length f of the imaging lens satisfy the condition: 0.86≤f6 / f≤1.

14.

29. The imaging lens according to claim 18 or 19, wherein, The effective focal length f8 of the eighth lens and the total effective focal length f of the imaging lens satisfy the following condition: -1.84≤f8 / f≤-1.

28.

30. The imaging lens according to claim 18 or 19, wherein, The effective focal length f9 of the ninth lens and the total effective focal length f of the imaging lens satisfy the condition: 0.75≤f9 / f≤0.

94.

31. The imaging lens according to claim 18 or 19, wherein, The effective focal length f10 of the tenth lens and the total effective focal length f of the imaging lens satisfy the following condition: -0.71≤f10 / f≤-0.

6.

32. The imaging lens according to claim 18 or 19, wherein, The effective focal length f11 of the eleventh lens and the total effective focal length f of the imaging lens satisfy the following condition: 0.76≤f11 / f≤0.83.

Images