Optical imaging lens

Abstract

The utility model discloses an optical imaging lens, which comprises a lens barrel assembly, an imaging lens group and a spacer group, and is characterized in that the imaging lens group comprises a first lens group and a second lens group, and the first lens group comprises a first lens, a second lens and a third lens; the second lens group comprises a fourth lens, a fifth lens and a sixth lens; the spacer group comprises a fourth spacer in contact with the image side surface of the fourth lens and a fifth spacer in contact with the image side surface of the fifth lens; the lens barrel assembly comprises a first lens barrel for accommodating the first lens group and a second lens barrel for accommodating the second lens group; the aperture number FNO of the optical imaging lens meets the following formula: FNOlt; 1.6); the distance L between the object side end face of the first lens cone and the image side end face of the second lens cone in the direction of the optical axis and the total effective focal length f of the optical imaging lens meet the following formula: 1.4 lt; l / flt; 1.7, 1.7; the inner diameter d4m of the image side surface of the fourth spacer, the inner diameter d5m of the image side surface of the fifth spacer, the refractive index N4 of the fourth lens and the refractive index N5 of the fifth lens satisfy 14.5 lt; (d5m / d4m) / (N5-N4) lt; 55.2).

Description

Technical Field

[0001] This application relates to the field of optical devices, and particularly to a six-piece optical imaging lens. Background Art

[0002] With the popularization of portable electronic products such as mobile phones and tablet computers, more new requirements are put forward for the imaging function of portable electronic products. For example, the imaging lens of a portable electronic product needs to meet the characteristics of a large aperture and a long focal length.

[0003] In order to enable a six-piece imaging lens to simultaneously achieve the characteristics of a large aperture and a long focal length, the volume of the lens group closer to the image side of the imaging lens is smaller than that of the lens group closer to the image side of the imaging lens, and there are problems such as a smaller aperture of the lens in the lens group closer to the image side of the imaging lens and a larger deflection angle of the lens for light, which will cause the effective light at the edge to be easily refracted to the non-effective part of these lenses, thereby generating stray light and seriously affecting the imaging quality of the imaging lens. Summary of the Utility Model

[0004] This application provides an optical imaging lens that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0005] One aspect of this application provides such an optical imaging lens, which includes a lens barrel assembly, an imaging lens group and a spacer group disposed in the lens barrel assembly. The imaging lens group includes a first lens group and a second lens group arranged in sequence from the object side to the image side along the optical axis. The first lens group includes a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side along the optical axis. The second lens group includes a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. The refractive index of the fifth lens is greater than that of any one of the fourth lens and the sixth lens; the spacer group includes a fourth spacer disposed on and in contact with the image side surface of the fourth lens and a fifth spacer disposed on and in contact with the image side surface of the fifth lens; the lens barrel assembly includes a first lens barrel and a second lens barrel. The first lens barrel houses the first lens group, and the second lens barrel houses the second lens group; wherein, the aperture number FNO of the optical imaging lens satisfies: FNO < 1.6; the distance L between the object side end surface of the first lens barrel and the image side end surface of the second lens barrel in the direction of the optical axis and the total effective focal length f of the optical imaging lens satisfy: 1.4 < L / f < 1.7; the inner diameter d4m of the image side surface of the fourth spacer, the inner diameter d5m of the image side surface of the fifth spacer, the refractive index N4 of the fourth lens and the refractive index N5 of the fifth lens satisfy: 14.5 < (d5m / d4m) / (N5 - N4) < 55.2.

[0006] According to an exemplary embodiment of the present application, the distance L between the object side end surface of the first lens barrel and the image side end surface of the second lens barrel in the direction of the optical axis, the total effective focal length f of the optical imaging lens and the air interval T34 between the third lens and the fourth lens on the optical axis meet the following conditions: 5.5 mm <L / f×T34<6.1mm。

[0007] According to an exemplary embodiment of the present application, the maximum effective semi-aperture DT51 of the object side surface of the fifth lens, the inner diameter d4s of the object side surface of the fourth spacer, and the inner diameter d5s of the object side surface of the fifth spacer satisfy: -13.0 <DT51 / (d4s-d5s)<-4.5。

[0008] According to an exemplary embodiment of the present application, the center thickness CT5 of the fifth lens on the optical axis, the interval EP45 between the fourth spacer and the fifth spacer along the optical axis, and the refractive index N5 of the fifth lens satisfy: 2.2 <CT5 / EP45×N5<3.0。

[0009] According to an exemplary embodiment of the present application, the inner diameter d4s of the object side of the fourth spacer, the outer diameter D4s of the object side of the fourth spacer, the air gap T45 between the fourth lens and the fifth lens on the optical axis and the maximum thickness CP4 of the fourth spacer satisfy: 5.0<(D4s-d4s) / (T45-CP4)<8.0.

[0010] According to an exemplary embodiment of the present application, the inner diameter d5s of the object side of the fifth spacer, the outer diameter D5s of the object side of the fifth spacer, the air gap T56 between the fifth lens and the sixth lens on the optical axis, and the maximum thickness CP5 of the fifth spacer satisfy: 5.2<(D5s-d5s) / (T56-CP5)<7.0.

[0011] According to an exemplary embodiment of the present application, the effective focal length F2 of the second lens group, the effective focal length f5 of the fifth lens, and the interval EP45 between the fourth spacer and the fifth spacer along the optical axis satisfy: -1.5 mm <F2 / f5×EP45<0mm。

[0012] According to an exemplary embodiment of the present application, the inner diameter d4m of the image side surface of the fourth spacer, the curvature radius R8 of the image side surface of the fourth lens, and the curvature radius R9 of the object side surface of the fifth lens satisfy: -10.5 <d4m / (R8-R9)<9.0。

[0013] According to an exemplary embodiment of the present application, the inner diameter d5m of the image side surface of the fifth spacer, the curvature radius R10 of the image side surface of the fifth lens, and the curvature radius R11 of the object side surface of the sixth lens satisfy: -1.5 <d5m / (R10-R11)<0.1。

[0014] According to an exemplary embodiment of the present application, the outer diameter D4m of the image side of the fourth spacer, the outer diameter D5s of the object side of the fifth spacer, the radius of curvature R9 of the object side of the fifth lens, and the radius of curvature R10 of the image side of the fifth lens satisfy: -5.5 < D4m / R9 + R10 / D5s < 6.5.

[0015] According to an exemplary embodiment of the present application, the effective focal length F1 of the first lens group and the length L1 of the first lens barrel in the direction of the optical axis satisfy: 1.0 < F1 / L1 < 1.3, and the effective focal length F2 of the second lens group and the length L2 of the second lens barrel in the direction of the optical axis satisfy: -3.0 < F2 / L2 < -2.5.

[0016] According to an exemplary embodiment of the present application, the inner diameter d02s of the object side end face of the second lens barrel, the effective focal length f4 of the fourth lens, and the refractive index N4 of the fourth lens satisfy: -1.8 < d02s / (f4 / N4) < -1.0.

[0017] According to an exemplary embodiment of the present application, the inner diameter d01m of the image side end face of the first lens barrel, the inner diameter d02s of the object side end face of the second lens barrel, the maximum effective semi-aperture DT32 of the image side of the third lens, and the maximum effective semi-aperture DT41 of the object side of the fourth lens satisfy: 1.8 < (d01m - d02s) / (DT32 - DT41) < 3.3.

[0018] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on the image side of the first lens and in contact with the image side of the first lens, and a first auxiliary spacer disposed on the image side of the first spacer and in contact with the image side of the first spacer. The effective focal length f1 of the first lens, the effective focal length f4 of the fourth lens, the maximum thickness CP1b of the first auxiliary spacer, and the maximum thickness CP4 of the fourth spacer satisfy: -34.0 < f4 / CP4 / (f1 / CP1b) < -6.9.

[0019] According to an exemplary embodiment of the present application, the air gap between the third lens and the fourth lens on the optical axis is variable, and the variable is less than 3 mm.

[0020] The optical imaging lens provided by the present application includes two lens barrels. By reasonably distributing each lens and reasonably setting the refractive index of the fifth lens, the characteristics of large aperture and long focal length of the optical imaging lens can be achieved. For example, FNO < 1.6, 1.4 < L / f < 1.7. In this case, due to the limitation of the lens barrel volume, there will be more stray light generated by the spacers. Moreover, the volume of the second lens group is smaller than that of the first lens group, and the refractive index of the fifth lens in the second lens group is greater than that of the adjacent lens, so the deflection angle of light at the fifth lens is larger. The apertures of the fourth lens and the fifth lens are smaller than those of the lenses in the first lens group and are closer to the effective light at the edge. Therefore, by reasonably configuring the refractive indices of the fourth lens and the fifth lens and the inner diameters of the image sides of the fourth spacer and the fifth spacer, the refraction path of light passing through the fourth lens and the fifth lens can be adjusted. Without affecting the optical performance, it can ensure that the refraction focal length of light will not be too large. At the same time, the spacers can also block the excess light at the edge position and reduce the stray light generated by the light hitting the lens mechanism part. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings, in which:

[0022] Figure 1 Shows a parameter schematic diagram of the optical imaging lens according to the present application;

[0023] Figure 2 Shows a stray light spot diagram of the optical imaging lens when FNO = 1.4 and (d5m / d4m) / (N5 - N4) = 13.0;

[0024] Figure 3 Shows a stray light spot diagram of the optical imaging lens when FNO = 1.4 and (d5m / d4m) / (N5 - N4) = 20.0;

[0025] Figure 4 Shows a stray light spot diagram of the optical imaging lens when FNO = 1.4 and (d5m / d4m) / (N5 - N4) = 57.0;

[0026] Figure 5 Shows a structural schematic diagram of the optical imaging lens according to Embodiment 1 of the present application;

[0027] Figure 6 Shows a structural schematic diagram of the optical imaging lens according to Embodiment 2 of the present application;

[0028] Figure 7 Shows a structural schematic diagram of the optical imaging lens according to Embodiment 3 of the present application;

[0029] FIG. 8A to FIG. 8C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens according to Embodiment 1, 2 or 3 of the present application are respectively shown;

[0030] Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown;

[0031] Fig.10 A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application is shown;

[0032] Fig.11 A schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application is shown;

[0033] FIG. 12A to FIG. 12C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens according to Embodiment 4, 5 or 6 of the present application are respectively shown;

[0034] Fig.13 A schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application is shown;

[0035] Fig.14 A schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application is shown;

[0036] Fig.15 A schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application is shown; and

[0037] FIG. 16A to FIG. 16C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens according to Embodiment 7, 8 or 9 of the present application are respectively shown. DETAILED DESCRIPTION

[0038] 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 do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0039] 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 third lens.

[0040] In the 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 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 for illustration only and are not drawn strictly to scale.

[0041] 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.

[0042] It should also be understood that the terms "include", "comprising", "having", "including" 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 describing embodiments of the present application, the term "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.

[0043] 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.

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] The features, principles and other aspects of the present application are described in detail below.

[0046] Figure 1 Schematic diagram of the structure arrangement and some parameters of the optical imaging lens according to an exemplary embodiment of the present application. Figure 1, d4s represents the inner diameter of the object side surface of the fourth spacer, D4s represents the outer diameter of the object side surface of the fourth spacer, d4m represents the inner diameter of the image side surface of the fourth spacer, D4m represents the outer diameter of the image side surface of the fourth spacer, d5s represents the inner diameter of the object side surface of the fifth spacer, D5s represents the outer diameter of the object side surface of the fifth spacer, d5m represents the inner diameter of the image side surface of the fifth spacer, d01m represents the inner diameter of the image side end surface of the first lens barrel, d02s represents the inner diameter of the object side end surface of the second lens barrel, CP4 represents the maximum thickness of the fourth spacer, EP45 represents the interval between the fourth spacer and the fifth spacer along the optical axis, CP5 represents the maximum thickness of the fifth spacer, CP1b represents the maximum thickness of the first auxiliary spacer, L represents the distance between the object side end surface of the first lens barrel and the image side end surface of the second lens barrel in the direction of the optical axis, L1 represents the length of the first lens barrel in the direction of the optical axis, and L2 represents the length of the second lens barrel in the direction of the optical axis.

[0047] refer to Figures 5 to 7 , Figures 9 to 11 as well as Figures 13 to 15 In the first aspect of the present application, an optical imaging lens is provided. The optical imaging lens may include an imaging lens group. The imaging lens group may include a first lens group and a second lens group arranged in sequence from the object side to the image side along the optical axis. The first lens group includes a first lens, a second lens and a third lens arranged in sequence from the object side to the image side along the optical axis. The second lens group includes a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis. Among the first lens to the sixth lens, there may be an air gap between any two adjacent lenses. As an example, the first lens, the third lens and the fifth lens may have positive focal power, and the second lens, the fourth lens and the sixth lens may have negative focal power. As an example, the air gap between the third lens and the fourth lens on the optical axis is variable, and the variable is less than 3 mm. By changing the spacing between the first lens group and the second lens group, the zoom of the optical imaging lens can be achieved, so that the optical imaging lens can obtain more field of view space relative to the fixed focus lens, and is suitable for shooting more scenes.

[0048] In an exemplary embodiment, the optical imaging lens may further include a spacer group, and the spacer group may include one or more of a first spacer, a first auxiliary spacer, a second spacer, a fourth spacer, and a fifth spacer. The first spacer is disposed on the image side surface of the first lens and is at least partially in contact with the image side surface of the first lens. The first auxiliary spacer is disposed on the image side surface of the first spacer and is at least partially in contact with the image side surface of the first spacer. The second spacer is disposed on the image side surface of the second lens and is at least partially in contact with the image side surface of the second lens. The fourth spacer is disposed on the image side surface of the fourth lens and is at least partially in contact with the image side surface of the fourth lens. The fifth spacer is disposed on the image side surface of the fifth lens and is at least partially in contact with the image side surface of the fifth lens. Reasonable use of the spacers can effectively avoid the risk of stray light, reduce the interference to the image quality, and thus improve the imaging quality of the optical imaging lens.

[0049] In an exemplary embodiment, the optical imaging lens may further include a lens barrel assembly, and the imaging lens group and the spacer group are disposed within the lens barrel assembly. The lens barrel assembly may include a first lens barrel and a second lens barrel. The first lens barrel houses the first lens group. The second lens barrel houses the second lens group.

[0050] In an exemplary embodiment, the refractive index of the fifth lens is greater than that of any one of the fourth lens and the sixth lens. The aperture number FNO of the optical imaging lens may satisfy: FNO < 1.6. The distance L between the object-side end face of the first lens barrel and the image-side end face of the second lens barrel in the direction of the optical axis and the total effective focal length f of the optical imaging lens may satisfy: 1.4 < L / f < 1.7. The inner diameter d4m of the image side surface of the fourth spacer, the inner diameter d5m of the image side surface of the fifth spacer, the refractive index N4 of the fourth lens, and the refractive index N5 of the fifth lens may satisfy: 14.5 < (d5m / d4m) / (N5 - N4) < 55.2. By reasonably allocating each lens and reasonably setting the refractive index of the fifth lens, the optical imaging lens provided in the present application can achieve the characteristics of a large aperture and a long focal length of the optical imaging lens. For example, FNO < 1.6, 1.4 < L / f < 1.7. In this case, due to the limitation of the lens barrel volume, there will be more stray light generated by the spacers. Moreover, the volume of the second lens group is smaller than that of the first lens group, the refractive index of the fifth lens in the second lens group is greater than that of the adjacent lens, the deflection angle of the light at the fifth lens is larger, the apertures of the fourth lens and the fifth lens are smaller than those of the lenses in the first lens group, and they are closer to the effective light at the edge. Therefore, by reasonably configuring the refractive indices of the fourth lens and the fifth lens and the inner diameters of the image side surfaces of the fourth spacer and the fifth spacer, the refraction route of the light passing through the fourth lens and the fifth lens can be adjusted. Without affecting the optical performance, it can ensure that the refraction focal length of the light is not too large, and at the same time, the spacers can block the excess light at the edge position, reducing the stray light generated by the light hitting the lens mechanism part (i.e., the non-effective diameter part).

[0051] Figure 2 It is the stray light spot diagram when the optical imaging lens is at FNO = 1.4 and (d5m / d4m) / (N5 - N4) = 13.0. Figure 3 It is the stray light spot diagram when the optical imaging lens is at FNO = 1.4 and (d5m / d4m) / (N5 - N4) = 20.0. Figure 4 It is the stray light spot diagram when the optical imaging lens is at FNO = 1.4 and (d5m / d4m) / (N5 - N4) = 57.0. From Figure 2 , Figure 3 and Figure 4 it can be seen that when (d5m / d4m) / (N5 - N4) = 13.0 or (d5m / d4m) / (N5 - N4) = 57.0, the optical imaging lens has strong stray light, while when (d5m / d4m) / (N5 - N4) = 20.0, the stray light phenomenon of the optical imaging lens is significantly improved. It can be seen that by making (d5m / d4m) / (N5 - N4) within the range of 14.5 to 55.2, the stray light phenomenon of the optical imaging lens can be effectively improved.

[0052] In an exemplary embodiment, the distance L between the object - side end face of the first lens barrel and the image - side end face of the second lens barrel in the direction of the optical axis, the total effective focal length f of the optical imaging lens, and the air gap T34 between the third lens and the fourth lens on the optical axis may satisfy: 5.5mm < L / f×T34 < 6.1mm. Reasonably controlling the mutual relationship among the distance between the object - side end face of the first lens barrel and the image - side end face of the second lens barrel in the direction of the optical axis, the total effective focal length of the optical imaging lens, and the air gap between the third lens and the fourth lens on the optical axis can increase the rationality of the spacing arrangement between lens groups, reduce the gap sensitivity of the optical imaging lens, and improve the performance of the optical imaging lens.

[0053] In an exemplary embodiment, the maximum effective semi - aperture DT51 of the object - side surface of the fifth lens, the inner diameter d4s of the object - side surface of the fourth spacer, and the inner diameter d5s of the object - side surface of the fifth spacer may satisfy: - 13.0 < DT51 / (d4s - d5s) < - 4.5. Reasonably controlling the mutual relationship among the maximum effective semi - aperture of the object - side surface of the fifth lens and the inner diameters of the object - side surfaces of the fourth spacer and the fifth spacer can use the fourth spacer and the fifth spacer to block excess stray light and avoid light leakage problems in the optical imaging lens.

[0054] In an exemplary embodiment, the central thickness CT5 of the fifth lens on the optical axis, the interval EP45 between the fourth spacer and the fifth spacer along the optical axis, and the refractive index N5 of the fifth lens may satisfy: 2.2 < CT5 / EP45 × N5 < 3.0. By reasonably controlling the relationship among the central thickness of the fifth lens on the optical axis, the interval between the fourth spacer and the fifth spacer along the optical axis, and the refractive index of the fifth lens, the central thickness and the edge thickness of the fifth lens can be respectively constrained within a reasonable range, improving the processability and assembly stability of the fifth lens, and reducing the influence of the subsequent deformation of the fifth lens on the performance of the optical imaging lens.

[0055] In an exemplary embodiment, the inner diameter d4s of the object side surface of the fourth spacer, the outer diameter D4s of the object side surface of the fourth spacer, the air interval T45 between the fourth lens and the fifth lens on the optical axis, and the maximum thickness CP4 of the fourth spacer may satisfy: 5.0 < (D4s - d4s) / (T45 - CP4) < 8.0. By reasonably controlling the relationship among the inner and outer diameters of the object side surface of the fourth spacer, the air interval between the fourth lens and the fifth lens on the optical axis, and the maximum thickness of the fourth spacer, the outer diameter of the object side surface of the fourth spacer can be reduced while ensuring the assembly stability, thereby reducing the outer diameter and cost of the lens barrel assembly and improving the market competitiveness of the optical imaging lens.

[0056] In an exemplary embodiment, the inner diameter d5s of the object side surface of the fifth spacer, the outer diameter D5s of the object side surface of the fifth spacer, the air interval T56 between the fifth lens and the sixth lens on the optical axis, and the maximum thickness CP5 of the fifth spacer may satisfy: 5.2 < (D5s - d5s) / (T56 - CP5) < 7.0. By reasonably controlling the relationship among the inner and outer diameters of the object side surface of the fifth spacer, the air interval between the fifth lens and the sixth lens on the optical axis, and the maximum thickness of the fifth spacer, the gradient of the increase in the outer diameter of the fifth spacer can be reduced while ensuring the assembly stability, thereby reducing the outer diameter and cost of the lens barrel assembly and improving the market competitiveness of the optical imaging lens.

[0057] In an exemplary embodiment, the effective focal length F2 of the second lens group, the effective focal length f5 of the fifth lens, and the interval EP45 between the fourth spacer and the fifth spacer along the optical axis may satisfy: -1.5 mm < F2 / f5 × EP45 < 0 mm. By reasonably controlling the relationship among the effective focal length of the second lens group, the effective focal length of the fifth lens, and the interval between the fourth spacer and the fifth spacer along the optical axis, the thickness of the mechanical part (i.e., the non-effective diameter part) of the fifth lens can be constrained within a certain range, ensuring the strength and assembly stability of the fifth lens.

[0058] In an exemplary embodiment, the inner diameter d4m of the image side of the fourth spacer, the radius of curvature R8 of the image side of the fourth lens, and the radius of curvature R9 of the object side of the fifth lens may satisfy: -10.5 < d4m / (R8 - R9) < 9.0. By reasonably controlling the mutual relationship among the inner diameter of the image side of the fourth spacer, the radius of curvature of the image side of the fourth lens, and the radius of curvature of the object side of the fifth lens, it is possible to block excess stray light using the fourth spacer without affecting the marginal rays of the system, thereby improving the imaging quality of the optical imaging lens.

[0059] In an exemplary embodiment, the inner diameter d5m of the image side of the fifth spacer, the radius of curvature R10 of the image side of the fifth lens, and the radius of curvature R11 of the object side of the sixth lens may satisfy: -1.5 < d5m / (R10 - R11) < 0.1. By reasonably controlling the mutual relationship among the inner diameter of the image side of the fifth spacer, the radius of curvature of the image side of the fifth lens, and the radius of curvature of the object side of the sixth lens, it is possible to block excess stray light using the fifth spacer without affecting the marginal rays of the system, thereby improving the imaging quality of the optical imaging lens.

[0060] In an exemplary embodiment, the outer diameter D4m of the image side of the fourth spacer, the outer diameter D5s of the object side of the fifth spacer, the radius of curvature R9 of the object side of the fifth lens, and the radius of curvature R10 of the image side of the fifth lens may satisfy: -5.5 < D4m / R9 + R10 / D5s < 6.5. By reasonably controlling the mutual relationship among the outer diameter of the image side of the fourth spacer, the outer diameter of the object side of the fifth spacer, and the radii of curvature of the object side and the image side of the fifth lens, it is possible to ensure the rationality of the outer diameters of the fourth spacer and the fifth spacer, avoid deformation of the spacers due to excessive outer diameters in a high-temperature and high-humidity environment, and further avoid field curvature variation of the optical imaging lens caused by spacer deformation, thereby improving the reliability of the optical imaging lens.

[0061] In an exemplary embodiment, the effective focal length F1 of the first lens group and the length L1 of the first lens barrel in the direction of the optical axis may satisfy: 1.0 < F1 / L1 < 1.3, and the effective focal length F2 of the second lens group and the length L2 of the second lens barrel in the direction of the optical axis may satisfy: -3.0 < F2 / L2 < -2.5. By respectively constraining the ratio of the effective focal length of the first lens group to the length of the first lens barrel in the direction of the optical axis and the ratio of the effective focal length of the second lens group to the length of the second lens barrel in the direction of the optical axis within reasonable ranges, it is possible to reasonably distribute the optical power of the optical imaging lens, effectively reduce the sensitivity of the optical imaging lens while ensuring good imaging quality of the optical imaging lens, and improve the optical performance and assembly yield of the optical imaging lens.

[0062] In an exemplary embodiment, the inner diameter d02s of the object-side end face of the second lens barrel, the effective focal length f4 of the fourth lens, and the refractive index N4 of the fourth lens may satisfy: -1.8 < d02s / (f4 / N4) < -1.0. By reasonably controlling the mutual relationship among the inner diameter of the object-side end face of the second lens barrel, the effective focal length of the fourth lens, and the refractive index of the fourth lens, the distance between the sharp corner of the lens barrel assembly and the light system can be ensured, so that the light can be well refracted at the position of the fourth lens after entering the fourth lens from the object-side end face of the second lens barrel, which is beneficial to the large-aperture characteristic of the optical imaging lens.

[0063] In an exemplary embodiment, the inner diameter d01m of the image-side end face of the first lens barrel, the inner diameter d02s of the object-side end face of the second lens barrel, the maximum effective semi-aperture DT32 of the image-side surface of the third lens, and the maximum effective semi-aperture DT41 of the object-side surface of the fourth lens may satisfy: 1.8 < (d01m - d02s) / (DT32 - DT41) < 3.3. The air gap between the third lens and the fourth lens is the transition gap between the two lens groups. When the radial step difference of the lenses is large, it is difficult to adjust the light system. By reasonably controlling the maximum effective semi-aperture of the image-side surface of the third lens and the maximum effective semi-aperture of the object-side surface of the fourth lens, the smoothness of light transmission can be ensured. At the same time, by controlling the inner diameter of the image-side end face of the first lens barrel and the inner diameter of the object-side end face of the second lens barrel, a certain amount of stray light can be blocked when guiding the light into the second lens group, and redundant stray light can be prevented from entering the second lens group.

[0064] In an exemplary embodiment, the effective focal length f1 of the first lens, the effective focal length f4 of the fourth lens, the maximum thickness CP1b of the first auxiliary spacer, and the maximum thickness CP4 of the fourth spacer may satisfy: -34.0 < f4 / CP4 / (f1 / CP1b) < -6.9. The first lens and the fourth lens are the first lenses of the first lens group and the second lens group respectively. By reasonably controlling the mutual relationship among the effective focal length of the first lens, the effective focal length of the fourth lens, the maximum thickness of the first auxiliary spacer, and the maximum thickness of the fourth spacer, the sensitivity of the optical imaging lens can be reduced, the strength stability of the optical imaging lens can be ensured, and the production yield of the optical imaging lens can be improved.

[0065] In an exemplary embodiment, the optical imaging lens further includes a diaphragm, and the diaphragm can be disposed between the object side and the first lens according to actual needs.

[0066] According to the above-mentioned embodiment of the present application, the optical imaging lens can use six lenses and at least one spacer. By reasonably allocating the parameters of each lens and each spacer, the large aperture and long focus characteristics of the optical imaging lens can be achieved, the stray light phenomenon of the optical imaging lens can be improved, and the assembly stability and imaging quality of the optical imaging lens can be improved. The optical imaging lens provided by the present application further reduces the lens space while meeting the characteristics of large aperture and long focus, making the structure more compact.

[0067] In an embodiment of the present application, at least one of the surfaces of each lens in the first lens to the sixth lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side surface and the image side surface of each lens in the first lens to the sixth lens are both aspherical surfaces.

[0068] The second aspect of the present application provides such an optical imaging lens, which may include a lens barrel assembly and an imaging lens group. The imaging lens group may include a first lens group and a second lens group arranged in sequence from the object side to the image side along the optical axis, the first lens group includes a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side along the optical axis, the second lens group includes a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis, and the refractive index of the fifth lens is greater than the refractive index of any one of the fourth lens and the sixth lens. The lens barrel assembly may include a first lens barrel and a second lens barrel, the first lens barrel accommodating the first lens group, and the second lens barrel accommodating the second lens group.

[0069] The F-number FNO of the optical imaging lens can satisfy: FNO < 1.6. The distance L between the object-side end face of the first lens barrel and the image-side end face of the second lens barrel in the direction of the optical axis and the total effective focal length f of the optical imaging lens can satisfy: 1.4 < L / f < 1.7. The inner diameter d01m of the image-side end face of the first lens barrel, the inner diameter d02s of the object-side end face of the second lens barrel, the maximum effective semi-aperture DT32 of the image side surface of the third lens, and the maximum effective semi-aperture DT41 of the object side surface of the fourth lens can satisfy: 1.8 < (d01m - d02s) / (DT32 - DT41) < 3.3. The optical imaging lens provided in this application can achieve the characteristics of large aperture and long focal length of the optical imaging lens by reasonably allocating each lens and reasonably setting the refractive index of the fifth lens. For example, FNO < 1.6, 1.4 < L / f < 1.7; the air gap between the third lens and the fourth lens is the transition gap between the two lens groups. When the radial step difference of the lenses is large, it will be difficult to adjust the light system. Therefore, reasonably controlling the maximum effective semi-aperture of the image side surface of the third lens and the maximum effective semi-aperture of the object side surface of the fourth lens can ensure the smoothness of light transmission. At the same time, controlling the inner diameter of the image-side end face of the first lens barrel and the inner diameter of the object-side end face of the second lens barrel can block certain stray light when guiding light into the second lens group and avoid unnecessary stray light from entering the second lens group.

[0070] However, those skilled in the art should understand that without departing from the technical solutions claimed in this application, the number of lenses and spacers constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification.

[0071] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the drawings.

[0072] Example 1

[0073] The following refers to Figure 5 Describe the optical imaging lens according to Embodiment 1 of this application.

[0074] As Figure 5As shown, the optical imaging lens 100 includes a barrel assembly, an imaging lens group and a spacer group. The barrel assembly includes a first barrel P01 and a second barrel P02. The imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in order from the object side to the image side. The aperture STO can be arranged between the object side and the first lens E1. The first lens E1, the second lens E2 and the third lens E3 form a first lens group, the fourth lens E4, the fifth lens E5 and the sixth lens E6 form a second lens group, the first lens group is placed in the first barrel P01, and the second lens group is placed in the second barrel P02. The spacer group includes a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The spacer can block the excess light in the imaging process from entering the next lens, and at the same time make the lens and the barrel assembly better supported, thereby enhancing the structural stability of the optical imaging lens.

[0075] The first lens E1 has positive focal power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative focal power, its object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive focal power, its object side surface S5 is convex, and the image side surface S6 is convex. The fourth lens E4 has negative focal power, its object side surface S7 is concave, and the image side surface S8 is concave. The fifth lens E5 has positive focal power, its object side surface S9 is convex, and the image side surface S10 is convex. The sixth lens E6 has negative focal power, its object side surface S11 is concave, and the image side surface S12 is concave. The filter has an object side surface S13 (not shown) and an image side surface S14 (not shown). The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0076] Table 1 shows the basic parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0077]

[0078] Table 1

[0079] In this embodiment, the total effective focal length f of the optical imaging lens is 9.75 mm, the entrance pupil diameter EPD of the optical imaging lens is 7.04 mm, the maximum field of view FOV of the optical imaging lens is 25.20°, the effective focal length F1 of the first lens group is 8.82 mm, the effective focal length F2 of the second lens group is -9.12 mm, the maximum effective semi-aperture DT32 of the image side surface of the third lens is 3.14 mm, the maximum effective semi-aperture DT41 of the object side surface of the fourth lens is 2.38 mm, and the maximum effective semi-aperture DT51 of the object side surface of the fifth lens is 2.20 mm.

[0080] In this embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0081]

[0082] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A that can be used for each aspheric surface S1-S12 in Example 1 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0083]

[0084]

[0085] Table 2

[0086] Example 2

[0087] The following reference Figure 6 An optical imaging lens according to Embodiment 2 of the present application is described.

[0088] like Figure 6As shown, the optical imaging lens 200 includes a barrel assembly, an imaging lens group and a spacer group. The barrel assembly includes a first barrel P01 and a second barrel P02. The imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in order from the object side to the image side. The aperture STO can be arranged between the object side and the first lens E1. The first lens E1, the second lens E2 and the third lens E3 form a first lens group, the fourth lens E4, the fifth lens E5 and the sixth lens E6 form a second lens group, the first lens group is placed in the first barrel P01, and the second lens group is placed in the second barrel P02. The spacer group includes a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The spacer can block the excess light in the imaging process from entering the next lens, and at the same time make the lens and the barrel assembly better supported, thereby enhancing the structural stability of the optical imaging lens.

[0089] The structure of the lens of this embodiment is the same as that of the lens of Embodiment 1, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 is that the structural dimensions of the first lens barrel P01, the second lens barrel P02, the first auxiliary spacer P1b, the fourth spacer P4 and the fifth spacer P5 are different. For example, the parameters such as d4s, D4s, d4m, D4m, d5s, D5s, d5m, d01m, d02s, CP4, EP45, CP5, CP1b, L, L1 and L2 are different.

[0090] Example 3

[0091] The following reference Figure 7 An optical imaging lens according to Embodiment 3 of the present application is described.

[0092] like Figure 7As shown, the optical imaging lens 300 includes a barrel assembly, an imaging lens group and a spacer group. The barrel assembly includes a first barrel P01 and a second barrel P02. The imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in order from the object side to the image side. The aperture STO can be arranged between the object side and the first lens E1. The first lens E1, the second lens E2 and the third lens E3 form a first lens group, the fourth lens E4, the fifth lens E5 and the sixth lens E6 form a second lens group, the first lens group is placed in the first barrel P01, and the second lens group is placed in the second barrel P02. The spacer group includes a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The spacer can block the excess light in the imaging process from entering the next lens, and at the same time make the lens and the barrel assembly better supported, thereby enhancing the structural stability of the optical imaging lens.

[0093] The structure of the lens of this embodiment is the same as that of the lens of Embodiment 1, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 is that the structural dimensions of the first lens barrel P01, the second lens barrel P02, the first auxiliary spacer P1b, the fourth spacer P4 and the fifth spacer P5 are different. For example, the parameters such as d4s, D4s, d4m, D4m, d5s, D5s, d5m, d01m, d02s, CP4, EP45, CP5, CP1b, L, L1 and L2 are different.

[0094] Fig. 8A The axial chromatic aberration curves of the optical imaging lenses of Examples 1, 2, and 3 are shown, which indicate the deviation of the focal point of light rays of different wavelengths after passing through the optical imaging lens. Figure 8B The astigmatism curves of the optical imaging lenses of Examples 1, 2, and 3 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 8C The distortion curves of the optical imaging lenses of Examples 1, 2, and 3 are shown, which represent the distortion values ​​corresponding to different field angles. FIG. 8A to FIG. 8C It can be seen that the optical imaging lenses provided in Examples 1, 2, and 3 can achieve good imaging quality.

[0095] Example 4

[0096] The following reference Fig. 9 An optical imaging lens according to Embodiment 4 of the present application is described.

[0097] like Fig. 9As shown, the optical imaging lens 400 includes a barrel assembly, an imaging lens group and a spacer group. The barrel assembly includes a first barrel P01 and a second barrel P02. The imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in order from the object side to the image side. The aperture STO can be arranged between the object side and the first lens E1. The first lens E1, the second lens E2 and the third lens E3 form a first lens group, and the fourth lens E4, the fifth lens E5 and the sixth lens E6 form a second lens group. The first lens group is placed in the first barrel P01, and the second lens group is placed in the second barrel P02. The spacer group includes a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The spacer can block the excess light in the imaging process from entering the next lens, and at the same time make the lens and the barrel assembly better supported, thereby enhancing the structural stability of the optical imaging lens.

[0098] The first lens E1 has positive focal power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative focal power, its object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive focal power, its object side surface S5 is convex, and the image side surface S6 is convex. The fourth lens E4 has negative focal power, its object side surface S7 is convex, and the image side surface S8 is concave. The fifth lens E5 has positive focal power, its object side surface S9 is convex, and the image side surface S10 is concave. The sixth lens E6 has negative focal power, its object side surface S11 is convex, and the image side surface S12 is concave. The filter has an object side surface S13 (not shown) and an image side surface S14 (not shown). The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0099] Table 3 shows the basic parameters of the optical imaging lens of Example 4, wherein the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0100]

[0101] Table 3

[0102] In this embodiment, the total effective focal length f of the optical imaging lens is 9.68 mm, the entrance pupil diameter EPD of the optical imaging lens is 7.09 mm, the maximum field of view FOV of the optical imaging lens is 26.00°, the effective focal length F1 of the first lens group is 8.75 mm, the effective focal length F2 of the second lens group is -9.59 mm, the maximum effective semi-aperture DT32 of the image side surface of the third lens is 3.21 mm, the maximum effective semi-aperture DT41 of the object side surface of the fourth lens is 2.43 mm, and the maximum effective semi-aperture DT51 of the object side surface of the fifth lens is 2.22 mm.

[0103] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces. Table 4 lists the high-order coefficients A of the aspherical surfaces S1-S12 that can be used in Embodiment 4. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0104]

[0105]

[0106] Table 4

[0107] Example 5

[0108] The following reference Fig.10 An optical imaging lens according to Embodiment 5 of the present application is described.

[0109] like Fig.10 As shown, the optical imaging lens 500 includes a barrel assembly, an imaging lens group and a spacer group. The barrel assembly includes a first barrel P01 and a second barrel P02. The imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in order from the object side to the image side. The aperture STO can be arranged between the object side and the first lens E1. The first lens E1, the second lens E2 and the third lens E3 form a first lens group, the fourth lens E4, the fifth lens E5 and the sixth lens E6 form a second lens group, the first lens group is placed in the first barrel P01, and the second lens group is placed in the second barrel P02. The spacer group includes a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The spacer can block the excess light in the imaging process from entering the next lens, and at the same time make the lens and the barrel assembly better supported, thereby enhancing the structural stability of the optical imaging lens.

[0110] The structure of the lens of this embodiment is the same as that of the lens of Embodiment 4, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. The difference between this embodiment and Embodiment 4 is that the structural dimensions of the first lens barrel P01, the second lens barrel P02, the first auxiliary spacer P1b, the fourth spacer P4 and the fifth spacer P5 are different. For example, the parameters such as d4s, D4s, d4m, D4m, d5s, D5s, d5m, d01m, d02s, CP4, EP45, CP5, CP1b, L, L1 and L2 are different.

[0111] Example 6

[0112] The following reference Fig.11 An optical imaging lens according to Example 6 of the present application is described.

[0113] like Fig.11 As shown, the optical imaging lens 600 includes a barrel assembly, an imaging lens group and a spacer group. The barrel assembly includes a first barrel P01 and a second barrel P02. The imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in order from the object side to the image side. The aperture STO can be arranged between the object side and the first lens E1. The first lens E1, the second lens E2 and the third lens E3 form a first lens group, the fourth lens E4, the fifth lens E5 and the sixth lens E6 form a second lens group, the first lens group is placed in the first barrel P01, and the second lens group is placed in the second barrel P02. The spacer group includes a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The spacer can block the excess light in the imaging process from entering the next lens, and at the same time make the lens and the barrel assembly better supported, thereby enhancing the structural stability of the optical imaging lens.

[0114] The structure of the lens of this embodiment is the same as that of the lens of Embodiment 4, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. The difference between this embodiment and Embodiment 4 is that the structural dimensions of the first lens barrel P01, the second lens barrel P02, the first auxiliary spacer P1b, the fourth spacer P4 and the fifth spacer P5 are different. For example, the parameters such as d4s, D4s, d4m, D4m, d5s, D5s, d5m, d01m, d02s, CP4, EP45, CP5, CP1b, L, L1 and L2 are different.

[0115] Fig. 12A The axial chromatic aberration curves of the optical imaging lenses of Examples 4, 5, and 6 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig. 12BThe astigmatism curves of the optical imaging lenses of Examples 4, 5, and 6 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Fig. 12C The distortion curves of the optical imaging lenses of Examples 4, 5, and 6 are shown, which represent the distortion values ​​corresponding to different field angles. FIG. 12A to FIG. 12C It can be seen that the optical imaging lenses provided in Examples 4, 5 and 6 can achieve good imaging quality.

[0116] Example 7

[0117] The following reference Fig.13 An optical imaging lens according to Embodiment 7 of the present application is described.

[0118] like Fig.13 As shown, the optical imaging lens 700 includes a barrel assembly, an imaging lens group and a spacer group. The barrel assembly includes a first barrel P01 and a second barrel P02. The imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in order from the object side to the image side. The aperture STO can be arranged between the object side and the first lens E1. The first lens E1, the second lens E2 and the third lens E3 form a first lens group, the fourth lens E4, the fifth lens E5 and the sixth lens E6 form a second lens group, the first lens group is placed in the first barrel P01, and the second lens group is placed in the second barrel P02. The spacer group includes a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The spacer can block the excess light in the imaging process from entering the next lens, and at the same time make the lens and the barrel assembly better supported, thereby enhancing the structural stability of the optical imaging lens.

[0119] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The filter has an object side surface S13 (not shown) and an image side surface S14 (not shown). The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0120] Table 5 shows the basic parameters of the optical imaging lens of Example 7, wherein the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0121]

[0122] Table 5

[0123] In this embodiment, the total effective focal length f of the optical imaging lens is 9.97 mm, the entrance pupil diameter EPD of the optical imaging lens is 7.22 mm, the maximum field of view FOV of the optical imaging lens is 25.58°, the effective focal length F1 of the first lens group is 8.83 mm, the effective focal length F2 of the second lens group is -9.88 mm, the maximum effective semi-aperture DT32 of the image side surface of the third lens is 3.22 mm, the maximum effective semi-aperture DT41 of the object side surface of the fourth lens is 2.44 mm, and the maximum effective semi-aperture DT51 of the object side surface of the fifth lens is 2.19 mm.

[0124] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces. Table 6 shows the high-order coefficients A of the aspherical surfaces S1-S12 that can be used in Example 7. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0125]

[0126]

[0127] Table 6

[0128] Example 8

[0129] The following reference Fig.14 An optical imaging lens according to Example 8 of the present application is described.

[0130] like Fig.14As shown, the optical imaging lens 800 includes a barrel assembly, an imaging lens group and a spacer group. The barrel assembly includes a first barrel P01 and a second barrel P02. The imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in order from the object side to the image side. The aperture STO can be arranged between the object side and the first lens E1. The first lens E1, the second lens E2 and the third lens E3 form a first lens group, the fourth lens E4, the fifth lens E5 and the sixth lens E6 form a second lens group, the first lens group is placed in the first barrel P01, and the second lens group is placed in the second barrel P02. The spacer group includes a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The spacer can block the excess light in the imaging process from entering the next lens, and at the same time make the lens and the barrel assembly better supported, thereby enhancing the structural stability of the optical imaging lens.

[0131] The structure of the lens of this embodiment is the same as that of the lens of Embodiment 7, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 5, and the aspheric coefficient table is the same as Table 6. The difference between this embodiment and Embodiment 7 is that the structural dimensions of the first lens barrel P01, the second lens barrel P02, the first auxiliary spacer P1b, the fourth spacer P4 and the fifth spacer P5 are different. For example, the parameters such as d4s, D4s, d4m, D4m, d5s, D5s, d5m, d01m, d02s, CP4, EP45, CP5, CP1b, L, L1 and L2 are different.

[0132] Example 9

[0133] The following reference Fig.15 An optical imaging lens according to Example 9 of the present application is described.

[0134] like Fig.15As shown, the optical imaging lens 900 includes a barrel assembly, an imaging lens group and a spacer group. The barrel assembly includes a first barrel P01 and a second barrel P02. The imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in order from the object side to the image side. The aperture STO can be arranged between the object side and the first lens E1. The first lens E1, the second lens E2 and the third lens E3 form a first lens group, the fourth lens E4, the fifth lens E5 and the sixth lens E6 form a second lens group, the first lens group is placed in the first barrel P01, and the second lens group is placed in the second barrel P02. The spacer group includes a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The spacer can block the excess light in the imaging process from entering the next lens, and at the same time make the lens and the barrel assembly better supported, thereby enhancing the structural stability of the optical imaging lens.

[0135] The structure of the lens of this embodiment is the same as that of the lens of Embodiment 7, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 5, and the aspheric coefficient table is the same as Table 6. The difference between this embodiment and Embodiment 7 is that the structural dimensions of the first lens barrel P01, the second lens barrel P02, the first auxiliary spacer P1b, the fourth spacer P4 and the fifth spacer P5 are different. For example, the parameters such as d4s, D4s, d4m, D4m, d5s, D5s, d5m, d01m, d02s, CP4, EP45, CP5, CP1b, L, L1 and L2 are different.

[0136] Fig.16A The axial chromatic aberration curves of the optical imaging lenses of Examples 7, 8 and 9 are shown, which indicate the deviation of the focal point of light rays of different wavelengths after passing through the optical imaging lens. Fig. 16B The astigmatism curves of the optical imaging lenses of Examples 7, 8, and 9 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Fig. 16C The distortion curves of the optical imaging lenses of Examples 7, 8, and 9 are shown, which represent the distortion values ​​corresponding to different field angles. FIG. 16A to FIG. 16C It can be seen that the optical imaging lenses provided in Examples 7, 8 and 9 can achieve good imaging quality.

[0137] Table 7 shows the values ​​of parameters such as d4s, D4s, d4m, D4m, d5s, D5s, d5m, d01m, d02s, CP4, EP45, CP5, CP1b, L, L1 and L2 in each of Examples 1 to 9. The above parameters can be calculated according to Figure 1 The units of the parameters listed in Table 7 are all mm.

[0138] Parameters / Examples 1 2 3 4 5 6 7 8 9 d4s 4.336 4.443 4.233 4.363 4.479 4.285 4.262 4.315 4.101 d4m 4.336 4.443 4.233 4.363 4.479 4.285 4.262 4.315 4.101 D4s 7.295 7.295 7.295 7.300 7.300 7.300 7.300 7.300 7.300 D4m 7.295 7.295 7.295 7.300 7.300 7.300 7.300 7.300 7.300 d5s 4.795 4.837 4.662 4.650 4.650 4.582 4.636 4.744 4.462 d5m 4.795 4.837 4.662 4.650 4.650 4.582 4.636 4.744 4.462 D5s 7.495 7.495 7.495 7.500 7.500 7.500 7.500 7.500 7.500 d01m 7.211 7.032 7.032 7.289 7.289 7.289 7.280 7.279 7.441 d02s 4.923 5.085 5.483 5.354 5.354 5.354 5.354 5.077 5.074 CP4 0.022 0.022 0.022 0.022 0.022 0.022 0.022 0.022 0.022 EP45 0.846 0.846 0.846 0.542 0.542 0.542 0.551 0.551 0.551 CP5 0.022 0.022 0.022 0.022 0.022 0.022 0.022 0.022 0.022 CP1b 1.16 1.16 1.16 1.35 1.35 1.35 1.70 1.70 1.70 L 15.017 15.017 15.017 15.229 15.229 15.229 14.762 14.762 14.762 L1 7.8773 7.8773 7.8773 7.980 7.980 7.980 7.425 7.425 7.425 L2 3.430 3.430 3.430 3.430 3.430 3.430 3.430 3.430 3.430

[0139] Table 7

[0140] Table 8 shows the values ​​of the conditional expressions of each of Examples 1 to 9.

[0141] Conditional / Example 1 2 3 4 5 6 7 8 9 FNO 1.38 1.38 1.38 1.37 1.37 1.37 1.38 1.38 1.38 L / f 1.54 1.54 1.54 1.57 1.57 1.57 1.48 1.48 1.48 (d5m / d4m) / (N5-N4) 36.86 36.29 36.71 15.23 14.83 15.27 54.39 54.97 54.40 L / f×T34 5.94 5.94 5.94 6.03 6.03 6.03 5.74 5.74 5.74 DT51 / (d4s-d5s) -4.79 -5.58 -5.13 -7.72 -12.97 -7.48 -5.86 -5.11 -6.08 CT5 / EP45×N5 2.74 2.74 2.74 2.57 2.57 2.57 2.86 2.86 2.86 (D4s-d4s) / (T45-CP4) 5.56 5.36 5.75 5.34 5.13 5.48 7.44 7.31 7.84 (D5s-d5s) / (T56-CP5) 5.62 5.53 5.89 6.16 6.16 6.31 6.13 5.90 6.50 F2 / f5×EP45 -1.14 -1.14 -1.14 -0.62 -0.62 -0.62 -1.01 -1.01 -1.01 d4m / (R8-R9) -10.02 -10.26 -9.78 -4.91 -5.04 -4.82 8.56 8.67 8.24 d5m / (R10-R11) 0.02 0.02 0.02 -1.38 -1.38 -1.36 -0.09 -0.09 -0.09 D4m / R9+R10 / D5s -0.24 -0.24 -0.24 6.18 6.18 6.18 -5.14 -5.14 -5.14 F1 / L1 1.12 1.12 1.12 1.10 1.10 1.10 1.19 1.19 1.19 F2 / L2 -2.66 -2.66 -2.66 -2.80 -2.80 -2.80 -2.88 -2.88 -2.88 d02s / (f4 / N4) -1.09 -1.13 -1.21 -1.22 -1.22 -1.22 -1.60 -1.52 -1.51 (d01m-d02s) / (DT32-DT41) 3.05 2.60 2.06 2.46 2.46 2.46 2.46 2.82 3.03 f4 / CP4 / (f1 / CP1b) -12.02 -12.02 -12.02 -7.13 -7.13 -7.13 -33.81 -33.81 -33.81

[0142] Table 8

[0143] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0144] 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 inventive concept. 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.

Claims

1. An optical imaging lens, characterized in that: include: An imaging lens group, comprising a first lens group and a second lens group arranged in sequence from the object side to the image side along the optical axis, wherein the first lens group comprises a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side along the optical axis, and the second lens group comprises a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis, wherein the refractive index of the fifth lens is greater than the refractive index of any one of the fourth lens and the sixth lens; a spacer group, comprising a fourth spacer disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens, and a fifth spacer disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens; and A lens barrel assembly, comprising a first lens barrel and a second lens barrel, wherein the first lens barrel accommodates the first lens group, and the second lens barrel accommodates the second lens group; Wherein, the aperture number FNO of the optical imaging lens satisfies: 1.37≤FNO<1.6; The distance L between the object side end surface of the first lens barrel and the image side end surface of the second lens barrel in the direction of the optical axis and the total effective focal length f of the optical imaging lens satisfy: 1.4 <L / f<1.7; An inner diameter d4m of the image side surface of the fourth spacer, an inner diameter d5m of the image side surface of the fifth spacer, a refractive index N4 of the fourth lens, and a refractive index N5 of the fifth lens satisfy: 14.5<(d5m / d4m) / (N5-N4)<55.

2.

2. The optical imaging lens according to claim 1, wherein: The distance L between the object side end surface of the first lens barrel and the image side end surface of the second lens barrel in the direction of the optical axis, the total effective focal length f of the optical imaging lens, and the air interval T34 between the third lens and the fourth lens on the optical axis meet the following conditions: 5.5 mm <L / f×T34<6.1mm。 3. The optical imaging lens according to claim 1, wherein: The maximum effective semi-aperture DT51 of the object side surface of the fifth lens, the inner diameter d4s of the object side surface of the fourth spacer, and the inner diameter d5s of the object side surface of the fifth spacer satisfy: -13.0 <DT51 / (d4s-d5s)<-4.5。 4. The optical imaging lens according to claim 1, wherein: The center thickness CT5 of the fifth lens on the optical axis, the interval EP45 between the fourth spacer and the fifth spacer along the optical axis and the refractive index N5 of the fifth lens satisfy: 2.2 <CT5 / EP45×N5<3.0。 5. The optical imaging lens according to claim 1, wherein: An inner diameter d4s of the object side surface of the fourth spacer, an outer diameter D4s of the object side surface of the fourth spacer, an air gap T45 between the fourth lens and the fifth lens on the optical axis and a maximum thickness CP4 of the fourth spacer satisfy: 5.0<(D4s-d4s) / (T45-CP4)<8.

0.

6. The optical imaging lens according to claim 1, wherein: The inner diameter d5s of the object side of the fifth spacer, the outer diameter D5s of the object side of the fifth spacer, the air gap T56 between the fifth lens and the sixth lens on the optical axis and the maximum thickness CP5 of the fifth spacer satisfy: 5.2<(D5s-d5s) / (T56-CP5)<7.

0.

7. The optical imaging lens according to claim 1, wherein: The effective focal length F2 of the second lens group, the effective focal length f5 of the fifth lens, and the interval EP45 between the fourth spacer and the fifth spacer along the optical axis satisfy: -1.5 mm < F2 / f5 × EP45 < 0 mm.

8. The optical imaging lens according to any one of claims 1 to 7, characterized in that: The inner diameter d4m of the image side surface of the fourth spacer, the curvature radius R8 of the image side surface of the fourth lens, and the curvature radius R9 of the object side surface of the fifth lens satisfy: -10.5 < d4m / (R8 - R9) < 9.

0.

9. The optical imaging lens according to any one of claims 1 to 7, characterized in that: The inner diameter d5m of the image side surface of the fifth spacer, the curvature radius R10 of the image side surface of the fifth lens, and the curvature radius R11 of the object side surface of the sixth lens satisfy: -1.5 < d5m / (R10 - R11) < 0.

1.

10. The optical imaging lens according to any one of claims 1 to 7, characterized in that: The outer diameter D4m of the image side surface of the fourth spacer, the outer diameter D5s of the object side surface of the fifth spacer, the curvature radius R9 of the object side surface of the fifth lens, and the curvature radius R10 of the image side surface of the fifth lens satisfy: -5.5 < D4m / R9 + R10 / D5s < 6.

5.

11. The optical imaging lens according to any one of claims 1 to 7, characterized in that: The effective focal length F1 of the first lens group and the length L1 of the first lens barrel in the direction of the optical axis satisfy: 1.0 < F1 / L1 < 1.3, and the effective focal length F2 of the second lens group and the length L2 of the second lens barrel in the direction of the optical axis satisfy: -3.0 < F2 / L2 < -2.

5.

12. The optical imaging lens according to any one of claims 1 to 7, characterized in that: The inner diameter d02s of the object side end surface of the second lens barrel, the effective focal length f4 of the fourth lens, and the refractive index N4 of the fourth lens satisfy: -1.8 < d02s / (f4 / N4) < -1.

0.

13. The optical imaging lens according to any one of claims 1 to 7, characterized in that: The inner diameter d01m of the image side end surface of the first lens barrel, the inner diameter d02s of the object side end surface of the second lens barrel, the maximum effective semi-aperture DT32 of the image side surface of the third lens, and the maximum effective semi-aperture DT41 of the object side surface of the fourth lens satisfy: 1.8 < (d01m - d02s) / (DT32 - DT41) < 3.

3.

14. The optical imaging lens according to any one of claims 1 to 7, characterized in that: The spacer group further includes a first spacer disposed on and in contact with the image side surface of the first lens and a first auxiliary spacer disposed on and in contact with the image side surface of the first spacer. Wherein, the effective focal length f1 of the first lens, the effective focal length f4 of the fourth lens, the maximum thickness CP1b of the first auxiliary spacer, and the maximum thickness CP4 of the fourth spacer satisfy: -34.0 < f4 / CP4 / (f1 / CP1b) < -6.

9.

15. The optical imaging lens according to any one of claims 1 to 7, characterized in that: The air interval between the third lens and the fourth lens on the optical axis is variable, and the variable is less than 3 mm.

16. The optical imaging lens according to any one of claims 1-7, characterized in that The first lens has a positive optical power, and its object side surface is a convex surface; The second lens has a negative optical power, its object side surface is a convex surface, and its image side surface is a concave surface; The third lens has a positive optical power, and its object side surface and image side surface are both convex surfaces; The fourth lens has a negative optical power, and its image side surface is a concave surface; The fifth lens has a positive optical power, and its object side surface is a convex surface; and The sixth lens has negative refractive power.

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