Optical imaging lens

Abstract

The utility model discloses an optical imaging lens, which comprises a first lens barrel, a second lens barrel, an optical lens group and a spacer group, and is characterized in that the spacer group comprises a fourth spacer and a fifth spacer; the optical lens group comprises a first lens group and a second lens group. The first lens group comprises first, second and third lenses; the second lens group has negative focal power and comprises a fourth lens, a fifth lens and a sixth lens, the fourth lens has positive focal power, and the fifth lens and the sixth lens have negative focal power; the first lens group is arranged in the first lens barrel, and the second lens group, the fourth spacer and the fifth spacer are arranged in the second lens barrel; the combined focal length f456 of the fourth lens, the fifth lens and the sixth 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 meet the following conditions:-1.1 lt; (d4s + d5s) / f456lt; 0; an air interval T45 between the fourth lens and the fifth lens on the optical axis, an air interval T56 between the fifth lens and the sixth lens on the optical axis, a maximum thickness CP4 of the fourth spacer and a maximum thickness CP5 of the fifth spacer satisfy: 0.2 lt; cP4 / T45-CP5 / T56lt, and T56lt; and 0.8.

Description

Technical Field

[0001] The present application relates to the field of optical devices, and in particular to a six-lens optical imaging lens. Background Art

[0002] In recent years, with the ever-changing consumer demand, the requirements for optical imaging lenses have gradually become more complex and diversified. In different application scenarios, the performance of optical imaging lenses is not the same.

[0003] Six-element optical imaging lenses have become mainstream and are widely used in the fields of mobile phones, security, automobiles, drones, etc. The rear lens has a great influence on the overall imaging of the six-element optical imaging lens. However, the structure of the rear lens in the existing six-element optical imaging lens is unreasonable, which will cause the rear lens to have high surface sensitivity and easy deformation, thus affecting the performance of the optical imaging lens. Utility Model Content

[0004] One aspect of the present application provides such an optical imaging lens, which includes a barrel assembly, an optical lens group and a spacer group. The optical lens group includes a first lens group and a second lens group with negative optical power 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; the second lens group includes a fourth lens with positive optical power, a fifth lens with negative optical power and a sixth lens with negative optical power. The spacer group includes a fourth spacer placed on the image side of the fourth lens and in contact with the image side of the fourth lens and a fifth spacer placed on the image side of the fifth lens and in contact with the image side of the fifth lens. The barrel assembly includes a first barrel and a second barrel, the first lens group is placed in the first barrel, and the second lens group, the fourth spacer and the fifth spacer are placed in the second barrel. The optical imaging lens has six lenses with optical power; the combined focal length f456 of the fourth lens, the fifth lens and the sixth 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: -1.1<(d4s+d5s) / f456<0; the air gap T45 between the fourth lens and the fifth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the maximum thickness CP4 of the fourth spacer and the maximum thickness CP5 of the fifth spacer satisfy: 0.2 <CP4 / T45-CP5 / T56<0.8。

[0005] According to an exemplary embodiment of the present application, the effective aperture DT41 of the object side of the fourth lens, the effective aperture DT62 of the image side of the sixth lens, the inner diameter d02s of the object side end surface of the second lens barrel and the inner diameter d02m of the image side end surface of the second lens barrel satisfy: -0.3 <d02s / DT41-d02m / DT62<0。

[0006] According to an exemplary embodiment of the present application, the curvature radius R6 of the image side surface of the third lens, the curvature radius R7 of the object side surface of the fourth lens, the inner diameter d01m of the image side end surface of the first lens barrel and the inner diameter d02s of the object side end surface of the second lens barrel satisfy: -0.3 <d01m / R6-d02s / R7<0.3。

[0007] According to an exemplary embodiment of the present application, the center thickness CT5 of the fifth lens on the optical axis, the refractive index N5 of the fifth lens, the inner diameter d4m of the image side surface of the fourth spacer and the inner diameter d5m of the image side surface of the fifth spacer satisfy: 0.2<(d4m-d5m) / CT5×N5<0.8.

[0008] According to an exemplary embodiment of the present application, an axial distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the effective half-aperture vertex of the object side surface of the fifth lens, an axial distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis to the effective half-aperture vertex of the image side surface of the fifth lens, and an interval EP45 between the fourth spacer and the fifth spacer along the optical axis satisfy: 2 <EP45 / (SAG51+SAG52)<5。

[0009] According to an exemplary embodiment of the present application, the combined focal length f123 of the first lens, the second lens and the third lens, the combined focal length f456 of the fourth lens, the fifth lens and the sixth lens, the length L1 of the first lens barrel along the direction where the optical axis is located, and the length L2 of the second lens barrel along the direction where the optical axis is located satisfy: <f123 / L1+f456 / L2<-0.8。

[0010] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens. The effective focal length f1 of the first lens, the Abbe number V1 of the first lens, the inner diameter d01s of the object side end surface of the first lens barrel, and the inner diameter d1s of the object side surface of the first spacer satisfy: 4<(d01s-d1s) / f1×V1<8.

[0011] According to an exemplary embodiment of the present application, the spacer set further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens, wherein the effective aperture DT12 of the image side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer, and the outer diameter D1s of the object side surface of the first spacer satisfy: 0<(D1s-d1s) / DT12<0.3.

[0012] 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 air gap T12 between the first lens and the second lens on the optical axis, the maximum thickness CP1 of the first spacer, and the maximum thickness CP1b of the first auxiliary spacer satisfy: 0.5<(CP1+CP1b) / T12<2.5.

[0013] According to an exemplary embodiment of the present application, the spacer set further includes a second spacer disposed on the image side of the second lens and in contact with the image side of the second lens. The effective aperture DT22 of the image side of the second lens, the effective aperture DT31 of the object side of the third lens, the inner diameter d2s of the object side of the second spacer, and the inner diameter d2m of the image side of the second spacer satisfy: -0.1 <d2m / DT31-d2s / DT22<0.1。

[0014] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens, and a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens. Wherein, the axial distance SAG21 between the intersection of the object side surface of the second lens and the optical axis to the effective half-aperture vertex of the object side surface of the second lens, the axial distance SAG22 between the intersection of the image side surface of the second lens and the optical axis to the effective half-aperture vertex of the image side surface of the second lens, and the interval EP12 between the first spacer and the second spacer along the optical axis satisfy: 1 <EP12 / (SAG21+SAG22)<2。

[0015] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens, and a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens. Wherein, the interval EP01 between the object side end surface of the first lens barrel and the first spacer along the optical axis, the interval EP12 between the first spacer and the second spacer along the optical axis, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: 0.4<(EP01+EP12) / (f1+f2)<0.8.

[0016] The optical imaging lens provided by the present application controls the ratio of the sum of the inner diameters of the object side surfaces of the fourth spacer and the fifth spacer to the combined focal length of the fourth lens, the fifth lens and the sixth lens, so that the fourth spacer and the fifth spacer can effectively block excess light without affecting the trend of the main light in the second lens group, thereby reducing the lens surface sensitivity of the entire field of view; at the same time, by limiting the ratio of the air gap between the spacer in the second lens group and the corresponding lens, the air gap between the fourth lens and the fifth lens and the air gap between the fifth lens and the sixth lens can be reasonably constrained to avoid an excessively large difference between the two air gaps, effectively reduce the sensitivity of the two air gaps, and thus reduce the performance loss caused by the deformation of the optical imaging lens, thereby improving the yield of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings, in which:

[0018] Figure 1 A parameter annotation diagram of an optical imaging lens according to the present application is shown;

[0019] Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown;

[0020] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown;

[0021] Figure 4 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown;

[0022] FIG. 5A to FIG. 5C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Embodiment 1, 2 or 3 of the present application are respectively shown;

[0023] Figure 6 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown;

[0024] Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application is shown;

[0025] Figure 8 A schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application is shown;

[0026] 9A to 9C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Embodiment 4, 5 or 6 of the present application are respectively shown;

[0027] Fig.10A schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application is shown;

[0028] Fig.11 A schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application is shown;

[0029] Fig.12 A schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application is shown;

[0030] FIG. 13A to FIG. 13C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Embodiment 7, 8 or 9 of the present application are respectively shown;

[0031] Fig.14A shows the Modulation Transfer Function (MTF) curve when the optical imaging lens satisfies CP4 / T45-CP5 / T56=2; and

[0032] Fig. 14B The modulation transfer function curve when the optical imaging lens satisfies CP4 / T45-CP5 / T56=0.43 is shown. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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 image plane is called the image side of the lens.

[0037] It should also be understood that the terms "including" and / or "having", 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 the 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.

[0038] 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.

[0039] 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.

[0040] Figure 1 : is a parameter annotation diagram of an optical imaging lens according to an exemplary embodiment of the present application. Figure 1, d1s represents the inner diameter of the object side surface of the first spacer, D1s represents the outer diameter of the object side surface of the first spacer, d2s represents the inner diameter of the object side surface of the second spacer, d2m represents the inner diameter of the image side surface of the second spacer, d4s represents the inner diameter of the object side surface of the fourth spacer, d4m represents the inner diameter of the image side surface of the fourth spacer, d5s represents the inner diameter of the object side surface of the fifth spacer, d5m represents the inner diameter of the image side surface of the fifth spacer, d01s represents the inner diameter of the object side end surface of the first lens barrel, d01m represents the inner diameter of the image side end surface of the first lens barrel, and d02s represents the inner diameter of the object side end surface of the second lens barrel , d02m represents the inner diameter of the image-side end face of the second lens barrel, EP01 represents the interval between the object-side end face of the first lens barrel and the first spacer along the optical axis, CP1 represents the maximum thickness of the first spacer, CP1b represents the maximum thickness of the first auxiliary spacer, EP12 represents the interval between the first spacer and the second spacer along the optical axis, 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, L1 represents the length of the first lens barrel along the direction of the optical axis, and L2 represents the length of the second lens barrel along the direction of the optical axis.

[0041] refer to Figures 2 to 4 , Figures 6 to 8 as well as Figures 10 to 12 In a first aspect of the present application, an optical imaging lens is provided. The optical imaging lens may include an optical lens group. The optical 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. An air gap may be provided between the first lens group and the second lens group.

[0042] In example embodiments, the first lens group may include a first lens, a second lens, and a third lens in order from the object side to the image side along the optical axis.

[0043] In an exemplary embodiment, the first lens group may have positive power. The first lens may have positive power. The second lens may have negative power. The third lens may have positive power.

[0044] In exemplary embodiments, the second lens group may have negative power and include, in order from the object side to the image side along the optical axis, a fourth lens having positive power, a fifth lens having negative power, and a sixth lens having negative power.

[0045] In example embodiments, the object-side surface of the first lens may be a convex surface, and the image-side surface may be a concave surface.

[0046] In example embodiments, the object-side surface of the second lens may be a convex surface, and the image-side surface may be a concave surface.

[0047] In example embodiments, the object-side surface of the third lens may be a convex surface, and the image-side surface may be a convex surface.

[0048] In example embodiments, the object-side surface of the fourth lens may be a concave surface, and the image-side surface may be a convex surface.

[0049] In example embodiments, the object-side surface of the fifth lens may be a convex surface, and the image-side surface may be a concave surface.

[0050] In example embodiments, the object-side surface of the sixth lens may be a concave surface, and the image-side surface may be a convex surface or a concave surface.

[0051] In an exemplary embodiment, the number of lenses having optical power of the optical imaging lens may be six.

[0052] In an exemplary embodiment, the position of the first lens group on the optical axis relative to the image plane is fixed. The second lens group can move relative to the first lens group along the optical axis, that is, the distance of the second lens group relative to the first lens group on the optical axis is adjustable. When the distance of the object to be photographed from far to near from the optical imaging lens is adjusted, the distance between the second lens group and the first lens group on the optical axis can be switched between the telephoto state and the close-up state to achieve the focus adjustment of the optical imaging lens.

[0053] By adjusting the gap between the first lens group and the second lens group to achieve the focus adjustment of the optical imaging lens, it is possible to effectively avoid the pollution problem caused by external substances (such as dust) entering the interior of the lens, and avoid the problems of poor imaging effect, module friction, and large loss caused by zooming in a digital zoom manner, thereby improving the imaging effect and service life of the optical imaging lens.

[0054] In an exemplary embodiment, the positions of the first lens group and the second lens group on the optical axis relative to the image plane are fixed, that is, the distance between the first lens group and the second lens group on the optical axis is a constant value.

[0055] In an exemplary embodiment, the optical imaging lens may further include a lens barrel assembly, which may include a first lens barrel and a second lens barrel arranged in sequence from the object side to the image side along the optical axis. The first lens group may be disposed in the first lens barrel. The second lens group may be disposed in the second lens barrel.

[0056] In an exemplary embodiment, the optical imaging lens may further include a spacer group, and the spacer group includes one or more of a first spacer, a first auxiliary spacer, a second spacer, a fourth spacer, and a fifth spacer. The first spacer and / or the second spacer is disposed in the first lens barrel. The first auxiliary spacer is disposed in the first lens barrel. The fourth spacer and / or the fifth spacer is disposed in the second lens barrel. The first spacer may be disposed on the image side of the first lens and at least partially in contact with the image side of the first lens. The first auxiliary spacer may be disposed on the image side of the first spacer and at least partially in contact with the image side of the first spacer. The second spacer may be disposed on the image side of the second lens and at least partially in contact with the image side of the second lens. The fourth spacer may be disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The fifth spacer may be disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. Reasonable use of the spacers can effectively avoid the risk of stray light, reduce the interference with the image quality, and thus improve the imaging quality of the optical imaging lens; at the same time, it can also ensure the bearing stability of the lens.

[0057] In an exemplary embodiment, the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens, the inner diameter d4s of the object side of the fourth spacer, and the inner diameter d5s of the object side of the fifth spacer may satisfy: -1.1 < (d4s + d5s) / f456 < 0. By reasonably configuring the ratio of the sum of the inner diameters of the object sides of the fourth spacer and the fifth spacer to the combined focal length of the fourth lens, the fifth lens, and the sixth lens, without affecting the trend of the chief ray in the second lens group, the fourth spacer and the fifth spacer can effectively block the excess light, reducing the lens surface sensitivity of the entire field of view.

[0058] In an exemplary embodiment, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the maximum thickness CP4 of the fourth spacer, and the maximum thickness CP5 of the fifth spacer may satisfy: 0.2 < CP4 / T45 - CP5 / T56 < 0.8. When the optical imaging lens satisfies "-1.1 < (d4s + d5s) / f456 < 0", by reasonably configuring the ratio of the maximum thickness of the fourth spacer to the air gap between the fourth lens and the fifth lens and the ratio of the maximum thickness of the fifth spacer to the air gap between the fifth lens and the sixth lens, the two air gaps can be constrained within an appropriate range, avoiding too large a difference between the two air gaps, effectively reducing the sensitivity of the two air gaps, and thus reducing the performance loss caused by the deformation of the optical imaging lens and improving the yield of the optical imaging lens.

[0059] The relationship between the deformation of the air gap of the lens and the sensitivity will be further described below in conjunction with Table 1 and Table 2. In Table 1 and Table 2, "F" in "0.1F", "0.2F", "0.3F", "0.4F", "0.5F", "0.6F", "0.7F", "0.8F", "0.9F" and "1.0F" represents the field of view.

[0060] Table 1 shows that the optical imaging lens satisfies "0.2 < CP4 / T45 - CP5 / T56 < 0.8". For example, when CP4 / T45 - CP5 / T56 of the optical imaging lens is 0.43, the sensitivities of T45 and T56 to the field curvature in the S direction and the field curvature in the T direction are shown. For example, at a field of view of 0.7, when T45 is slightly deformed, the offset of the field curvature in the S direction is 0.29 μm, and the offset of the field curvature in the T direction is 0.98 μm; when T56 is slightly deformed, the offset of the field curvature in the S direction is 0.21 μm, and the offset of the field curvature in the T direction is 0.56 μm.

[0061] Table 2 shows that the optical imaging lens does not satisfy "0.2 < CP4 / T45 - CP5 / T56 < 0.8". For example, when CP4 / T45 - CP5 / T56 of the optical imaging lens is 2, the sensitivities of T45 and T56 to the field curvature in the S direction and the field curvature in the T direction are shown. For example, at a field of view of 0.7, when T45 is slightly deformed, the offset of the field curvature in the S direction is -1.02 μm, and the offset of the field curvature in the T direction is -1.66 μm; when T56 is slightly deformed, the offset of the field curvature in the S direction is -1.25 μm, and the offset of the field curvature in the T direction is -1.74 μm.

[0062] Judging from the data provided in Table 1 and Table 2, when the optical imaging lens satisfies "0.2 < CP4 / T45 - CP5 / T56 < 0.8", the sensitivities of the deformations of T45 and T56 to the field curvature in the S direction and the field curvature in the T direction are significantly reduced, thereby effectively improving the MTF yield of the optical imaging lens.

[0063]

[0064]

[0065] Table 1

[0066]

[0067]

[0068] Table 2

[0069] Fig.14A is the modulation transfer function curve when the optical imaging lens satisfies CP4 / T45 - CP5 / T56 = 2; Fig. 14BIt is the modulation transfer function curve when the optical imaging lens satisfies CP4 / T45 - CP5 / T56 = 0.43. From Fig.14A it can be seen that when the optical imaging lens satisfies CP4 / T45 - CP5 / T56 = 2, the peak value of the optical modulation function value of the optical imaging lens is mainly concentrated at the defocus position of -0.015 mm to 0.025 mm. From Fig. 14B it can be seen that when the optical imaging lens satisfies CP4 / T45 - CP5 / T56 = 0.43, the peak value of the optical modulation function value of the optical imaging lens is mainly concentrated at the defocus position of -0.01 mm to 0.01 mm. It can be seen that by controlling the optical imaging lens to satisfy "0.2 < CP4 / T45 - CP5 / T56 < 0.8", it helps to improve the performance of the optical imaging lens.

[0070] In an exemplary embodiment, the effective aperture DT41 of the object side surface of the fourth lens, the effective aperture DT62 of the image side surface of the sixth lens, the inner diameter d02s of the object side end surface of the second barrel and the inner diameter d02m of the image side end surface of the second barrel may satisfy: -0.3 < d02s / DT41 - d02m / DT62 < 0. By controlling the above conditional formula, the effective apertures of the front and rear two surfaces of the second lens group can be restricted, and then the inner diameters of the object side end surface and the image side end surface of the second barrel can be adjusted. Without affecting the imaging of the optical imaging lens, it can effectively prevent excess light from entering the system and block the excess stray light brought by the spacer, thereby improving the imaging quality of the optical imaging lens.

[0071] In an exemplary embodiment, the radius of curvature R6 of the image side surface of the third lens, the radius of curvature R7 of the object side surface of the fourth lens, the inner diameter d01m of the image side end surface of the first barrel and the inner diameter d02s of the object side end surface of the second barrel may satisfy: -0.3 < d01m / R6 - d02s / R7 < 0.3. By controlling the above conditional formula, the radius of curvature of the adjacent surfaces of the two lens groups and the inner diameters of the adjacent side end surfaces of the two barrels can be restricted, ensuring the refraction angle and transition of the light entering and leaving between the two lens groups, and then ensuring the light transmittance of the optical imaging lens.

[0072] In an exemplary embodiment, the central thickness CT5 of the fifth lens on the optical axis, the refractive index N5 of the fifth lens, the inner diameter d4m of the image side surface of the fourth spacer and the inner diameter d5m of the image side surface of the fifth spacer may satisfy: 0.2 < (d4m - d5m) / CT5 × N5 < 0.8. By controlling the above conditional formula, the central thickness, refractive index of the fifth lens and the inner diameters of the image side surfaces of the adjacent two spacers can be restricted, ensuring the smoothness of the light passing through the fifth lens before and after, and blocking the excess light, thereby improving the optical performance of the optical imaging lens.

[0073] In an exemplary embodiment, the axial distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective semi-aperture of the object side surface of the fifth lens, the axial distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective semi-aperture of the image side surface of the fifth lens, and the interval EP45 between the fourth spacer and the fifth spacer along the optical axis may satisfy: 2 < EP45 / (SAG51 + SAG52) < 5. By controlling the above conditional expression, it is possible to constrain the ratio of the interval between the fourth spacer and the fifth spacer along the optical axis to the sum of the sag heights of the object side surface and the image side surface of the fifth lens, ensure that the fifth lens has an appropriate thickness-to-thinness ratio, facilitate the processing and molding of the fifth lens, and reduce the surface sensitivity of the fifth lens.

[0074] In an exemplary embodiment, the combined focal length f123 of the first lens, the second lens, and the third lens, the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens, the length L1 of the first lens barrel in the direction of the optical axis, and the length L2 of the second lens barrel in the direction of the optical axis may satisfy: -2 < f123 / L1 + f456 / L2 < -0.8. By controlling the above conditional expression, it is possible to constrain the ratio of the focal length of the first lens group to the length of the first lens barrel and the ratio of the focal length of the second lens group to the length of the second lens barrel, facilitate the reasonable distribution of the optical power of each lens group according to the length of each lens barrel, while enabling the optical imaging lens to have good imaging quality, effectively reducing the sensitivity of the optical imaging lens, and improving the optical performance and assembly yield of the optical imaging lens.

[0075] In an exemplary embodiment, the effective focal length f1 of the first lens, the Abbe number V1 of the first lens, the inner diameter d01s of the object-side end face of the first lens barrel, and the inner diameter d1s of the object side surface of the first spacer may satisfy: 4 < (d01s - d1s) / f1 × V1 < 8. By controlling the above conditional expression, it is possible to constrain the effective focal length and the Abbe number of the first lens, and then adjust the inner diameters of the shielding elements on the front and rear sides of the first lens (for example, the inner diameter of the object-side end face of the first lens barrel, the inner diameter of the object side surface of the first spacer), avoid unnecessary light from entering the system, and block the stray light caused by the reflection of the mechanism part (non-effective diameter part) of the first lens, thereby improving the imaging quality of the optical imaging lens.

[0076] In an exemplary embodiment, the effective aperture DT12 of the image side of the first lens, the inner diameter d1s of the object side of the first spacer, and the outer diameter D1s of the object side of the first spacer may satisfy: 0 < (D1s - d1s) / DT12 < 0.3. By controlling the above conditional expression, the size of the effective diameter portion of the first lens can be constrained, and then the inner and outer diameters of the adjacent spacer can be adjusted. Without affecting the processability of the first spacer and the imaging of the optical imaging lens, the outer diameter of the object side of the first spacer can be reduced, the occupied space of the first spacer can be reduced, the cost can be saved, and the market competitiveness of the optical imaging lens can be improved.

[0077] In an exemplary embodiment, the air gap T12 between the first lens and the second lens on the optical axis, the maximum thickness CP1 of the first spacer, and the maximum thickness CP1b of the first auxiliary spacer may satisfy: 0.5 < (CP1 + CP1b) / T12 < 2.5. By controlling the above conditional expression, the air gap between the first lens and the second lens can be constrained, and then the thicknesses of the first spacer and the first auxiliary spacer can be adjusted to ensure the assembly strength of the optical imaging lens and improve the assembly stability of the optical imaging lens.

[0078] In an exemplary embodiment, the effective aperture DT22 of the image side of the second lens, the effective aperture DT31 of the object side of the third lens, the inner diameter d2s of the object side of the second spacer, and the inner diameter d2m of the image side of the second spacer may satisfy: -0.1 < d2m / DT31 - d2s / DT22 < 0.1. By controlling the above conditional expression, the effective apertures of the image side of the second lens and the object side of the third lens can be constrained, and then the inner diameters of the object side and the image side of the second spacer can be adjusted. Without affecting the imaging of the optical imaging lens, it can be ensured that the second spacer can effectively block excess stray light and improve the imaging quality of the optical imaging lens.

[0079] In an exemplary embodiment, the axial distance SAG21 between the intersection of the object side of the second lens and the optical axis and the vertex of the effective semi-aperture of the object side of the second lens, the axial distance SAG22 between the intersection of the image side of the second lens and the optical axis and the vertex of the effective semi-aperture of the image side of the second lens, and the interval EP12 between the first spacer and the second spacer along the optical axis may satisfy: 1 < EP12 / (SAG21 + SAG22) < 2. By controlling the above conditional expression, the ratio of the interval between the first spacer and the second spacer along the optical axis to the sum of the sag heights of the object side and the image side of the second lens can be constrained, ensuring that the second lens has an appropriate thickness ratio, which is beneficial to the processing and forming of the second lens and reduces the surface sensitivity of the second lens.

[0080] In an exemplary embodiment, the interval EP01 between the object side end face of the first lens barrel and the first spacer along the optical axis, the interval EP12 between the first spacer and the second spacer along the optical axis, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens can satisfy: 0.4<(EP01+EP12) / (f1+f2)<0.8. By controlling the above conditional expressions, the effective focal lengths of the first lens and the second lens can be constrained within a reasonable range. At the same time, by limiting the interval between the object side end face of the first lens barrel and the first spacer along the optical axis, and the interval between the first spacer and the second spacer along the optical axis, it can be ensured that the first spacer and the second spacer are reasonably arranged in the first lens barrel, which is conducive to improving the assembly stability of the optical imaging lens and reducing the risk of assembly deformation.

[0081] According to the above-mentioned embodiment of the present application, the optical imaging lens can use six lenses, two lens barrels, and at least one spacer. By reasonably allocating the parameters of each lens, each lens barrel, and each spacer, the sensitivity of the optical imaging lens can be reduced, the stray light risk of the optical imaging lens can be improved, and the imaging quality, assembly stability, and assembly yield of the optical imaging lens can be improved.

[0082] 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.

[0083] The second aspect of the present application provides such an optical imaging lens, which includes a lens barrel assembly and an optical lens group. The optical lens group includes a first lens group and a second lens group with negative optical power 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; the second lens group includes a fourth lens with positive optical power, a fifth lens with negative optical power and a sixth lens with negative optical power. The lens barrel assembly includes a first lens barrel and a second lens barrel, the first lens group is placed in the first lens barrel, and the second lens group is placed in the second lens barrel. The number of lenses with optical power in the optical imaging lens is six.

[0084] Among them, the radius of curvature R6 of the image side surface of the third lens, the radius of curvature R7 of the object side surface of the fourth lens, the inner diameter d01m of the image side end surface of the first lens barrel, and the inner diameter d02s of the object side end surface of the second lens barrel may satisfy: -0.3 < d01m / R6 - d02s / R7 < 0.3. By controlling the above conditional formula, the radius of curvature of the adjacent surfaces of the two lens groups and the inner diameters of the adjacent side end surfaces of the two lens barrels can be restricted, ensuring the refraction angle and transition condition of the light entering and exiting between the two lens groups, and further ensuring the light passing amount of the optical imaging lens.

[0085] The third aspect of the present application provides such an optical imaging lens, which includes a lens barrel assembly and an optical lens group. The optical lens group includes a first lens group and a second lens group with negative optical power 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; the second lens group includes a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with negative optical power. The lens barrel assembly includes a first lens barrel and a second lens barrel, the first lens group is placed in the first lens barrel, and the second lens group is placed in the second lens barrel. The number of lenses with optical power in the optical imaging lens is six.

[0086] Among them, the combined focal length f123 of the first lens, the second lens, and the third lens, the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens, the length L1 of the first lens barrel in the direction of the optical axis, and the length L2 of the second lens barrel in the direction of the optical axis may satisfy: -2 < f123 / L1 + f456 / L2 < -0.8. By controlling the above conditional formula, the ratio of the focal length of the first lens group to the length of the first lens barrel and the ratio of the focal length of the second lens group to the length of the second lens barrel can be restricted, facilitating the reasonable distribution of the optical power of each lens group according to the length of each lens barrel. While enabling the optical imaging lens to have good imaging quality, the sensitivity of the optical imaging lens is effectively reduced, and the optical performance and assembly yield of the optical imaging lens are improved.

[0087] Those skilled in the art should understand that without departing from the technical solutions claimed in the present 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.

[0088] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings.

[0089] Example 1

[0090] The following refers to Figure 2 Describe the optical imaging lens according to Embodiment 1 of the present application.

[0091] As Figure 2As shown, the optical imaging lens comprises a lens barrel assembly, an optical lens group and a spacer group. The lens barrel assembly comprises a first lens barrel P01 and a second lens barrel P02.

[0092] The optical lens group includes a first lens group placed in a first lens barrel P01 and a second lens group placed in a second lens barrel P02 and having negative optical power in order from the object side to the image side along the optical axis. The first lens group includes a first lens E1, a second lens E2 and a third lens E3. The second lens group includes a fourth lens E4, a fifth lens E5 and a sixth lens E6.

[0093] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has 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 positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. A filter is also arranged between the sixth lens E6 and the imaging surface S15, and 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 (not shown).

[0094] 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 first spacer P1, the first auxiliary spacer P1b and the second spacer P2 are placed in the first lens barrel P01. The fourth spacer P4 and the fifth spacer P5 are placed in the second lens barrel P02. The spacers can block the excess light in the imaging process from entering the next lens, and at the same time make the lens better supported by the first lens barrel P01 or the second lens barrel P02, thereby enhancing the structural stability of the optical imaging lens.

[0095] Table 3 shows the basic parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature, thickness / distance, focal length, and effective semi-aperture are all millimeters (mm).

[0096]

[0097] Table 3

[0098] In this embodiment, the total effective focal length f of the optical imaging lens is 18.61 mm. The value of Semi-FOV, half of the maximum field of view angle of the optical imaging lens, is 17.24°. The combined focal length f123 of the first lens, the second lens, and the third lens is 12.19 mm. The combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens is -13.75 mm.

[0099] 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:

[0100]

[0101] 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 3 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 4 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0102] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.3104E-04 -7.3965E-05 1.4102E-05 -1.9312E-06 1.6852E-07 -9.5470E-09 3.3653E-10 S2 8.2430E-04 -2.9512E-04 6.2876E-05 -8.7419E-06 7.6592E-07 -4.3167E-08 1.5189E-09 S3 -4.3191E-03 -2.0257E-03 5.6623E-04 -6.5325E-05 -2.2696E-06 2.0674E-06 -3.7006E-07 S4 -2.1628E-03 -3.8062E-03 1.2592E-03 -2.2499E-04 2.4914E-05 -1.7477E-06 7.5623E-08 S5 1.4914E-03 -7.9252E-04 3.6413E-05 4.3693E-05 -1.4067E-05 2.2081E-06 -2.1290E-07 S6 1.4590E-03 -1.1088E-03 5.5341E-04 -1.8032E-04 4.0727E-05 -6.4890E-06 7.3137E-07 S7 1.5329E-02 -5.5218E-03 2.1829E-03 -6.1800E-04 1.2106E-04 -1.6467E-05 1.5539E-06 S8 5.7299E-03 -2.3502E-03 2.2094E-03 -1.1046E-03 3.5890E-04 -8.4081E-05 1.4864E-05 S9 -2.3824E-02 3.3607E-03 1.3982E-03 -1.1566E-03 4.0126E-04 -8.4788E-05 1.1562E-05 S10 -1.9037E-02 2.5103E-03 2.7974E-04 -3.7375E-04 1.4355E-04 -3.3465E-05 5.2536E-06 S11 -3.8520E-03 2.1161E-03 -2.0755E-03 1.2719E-03 -5.2826E-04 1.5369E-04 -3.1865E-05 S12 -1.1451E-03 -4.4117E-04 2.6253E-04 -9.8765E-05 2.5141E-05 -4.4905E-06 5.7608E-07 Face number A18 A20 A22 A24 A26 A28 A30 S1 -6.7134E-12 5.7898E-14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -3.0352E-11 2.6320E-13 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 3.8800E-08 -2.6730E-09 1.2154E-10 -3.4355E-12 5.0159E-14 -1.0526E-16 -4.3850E-18 S4 -1.8421E-09 1.9331E-11 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 1.3449E-08 -5.6404E-10 1.5325E-11 -2.4796E-13 1.8433E-15 0.0000E+00 0.0000E+00 S6 -5.7688E-08 3.0982E-09 -1.0709E-10 2.1052E-12 -1.6033E-14 -5.7145E-17 0.0000E+00 S7 -1.0001E-07 4.1912E-09 -1.0286E-10 1.1146E-12 0.0000E+00 0.0000E+00 0.0000E+00 S8 -2.0038E-06 2.0357E-07 -1.5187E-08 7.9925E-10 -2.7818E-11 5.6818E-13 -5.0782E-15 S9 -9.6639E-07 3.4160E-08 2.1362E-09 -3.4946E-10 2.0288E-11 -5.8832E-13 7.0609E-15 S10 -5.6879E-07 4.1945E-08 -2.0057E-09 5.5658E-11 -6.7172E-13 0.0000E+00 0.0000E+00 S11 4.7277E-06 -4.9761E-07 3.6236E-08 -1.7334E-09 4.8931E-11 -6.1647E-13 0.0000E+00 S12 -5.3803E-08 3.6691E-09 -1.8099E-10 6.2895E-12 -1.4592E-13 2.0237E-15 -1.2633E-17

[0103] Table 4

[0104] Example 2

[0105] The following reference Figure 3 An optical imaging lens according to Embodiment 2 of the present application is described.

[0106] like Figure 3 As shown, the optical imaging lens comprises a barrel assembly, an optical lens group and a spacer group. The barrel assembly comprises a first barrel P01 and a second barrel P02. The structure of the optical lens group is the same as that of the optical lens group of Example 1. The spacer group comprises a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The first spacer P1, the first auxiliary spacer P1b and the second spacer P2 are placed in the first barrel P01. The fourth spacer P4 and the fifth spacer P5 are placed in the second barrel P02.

[0107] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Embodiment 1, 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 1 is that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, the first spacer P1, the first auxiliary spacer P1b, the second spacer P2, the fourth spacer P4 and the fifth spacer P5 are different.

[0108] Example 3

[0109] The following reference Figure 4 An optical imaging lens according to Embodiment 3 of the present application is described.

[0110] like Figure 4 As shown, the optical imaging lens comprises a barrel assembly, an optical lens group and a spacer group. The barrel assembly comprises a first barrel P01 and a second barrel P02. The structure of the optical lens group is the same as that of the optical lens group of Example 1. The spacer group comprises a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The first spacer P1, the first auxiliary spacer P1b and the second spacer P2 are placed in the first barrel P01. The fourth spacer P4 and the fifth spacer P5 are placed in the second barrel P02.

[0111] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Embodiment 1, 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 1 is that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, the first spacer P1, the first auxiliary spacer P1b, the second spacer P2, the fourth spacer P4 and the fifth spacer P5 are different.

[0112] Figure 5A The axial chromatic aberration curve of the optical imaging lens of Example 1, 2 or 3 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical imaging lens. Figure 5B The astigmatism curves of the optical imaging lens of Example 1, 2 or 3 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 5C The distortion curve of the optical imaging lens of Embodiment 1, 2 or 3 is shown, which indicates the distortion magnitude value corresponding to different field angles. FIG. 5A to FIG. 5C It can be seen that the optical imaging lens of Example 1, 2 or 3 can achieve good imaging quality.

[0113] Example 4

[0114] The following reference Figure 6 An optical imaging lens according to Embodiment 4 of the present application is described.

[0115] like Figure 6 As shown, the optical imaging lens comprises a lens barrel assembly, an optical lens group and a spacer group. The lens barrel assembly comprises a first lens barrel P01 and a second lens barrel P02.

[0116] The optical lens group includes a first lens group placed in a first lens barrel P01 and a second lens group placed in a second lens barrel P02 and having negative optical power in order from the object side to the image side along the optical axis. The first lens group includes a first lens E1, a second lens E2 and a third lens E3. The second lens group includes a fourth lens E4, a fifth lens E5 and a sixth lens E6.

[0117] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has 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 positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave. A filter is also arranged between the sixth lens E6 and the imaging surface S15, and 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 (not shown).

[0118] 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 first spacer P1, the first auxiliary spacer P1b and the second spacer P2 are placed in the first lens barrel P01. The fourth spacer P4 and the fifth spacer P5 are placed in the second lens barrel P02. The spacers can block the excess light in the imaging process from entering the next lens, and at the same time make the lens better supported by the first lens barrel P01 or the second lens barrel P02, thereby enhancing the structural stability of the optical imaging lens.

[0119] Table 5 shows the basic parameters of the optical imaging lens of Example 4, wherein the units of the radius of curvature, thickness / distance, focal length, and effective semi-aperture are all millimeters (mm).

[0120]

[0121] Table 5

[0122] In this embodiment, the total effective focal length f of the optical imaging lens is 18.61 mm. The value of Semi-FOV, half of the maximum field of view angle of the optical imaging lens, is 17.18°. The combined focal length f123 of the first lens, the second lens, and the third lens is 12.22 mm. The combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens is -13.83 mm.

[0123] 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 lists the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A5 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0124]

[0125]

[0126] Table 6

[0127] Example 5

[0128] The following reference Figure 7 An optical imaging lens according to Embodiment 5 of the present application is described.

[0129] like Figure 7 As shown, the optical imaging lens comprises a barrel assembly, an optical lens group and a spacer group. The barrel assembly comprises a first barrel P01 and a second barrel P02. The structure of the optical lens group is the same as that of the optical lens group of Example 4. The spacer group comprises a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The first spacer P1, the first auxiliary spacer P1b and the second spacer P2 are placed in the first barrel P01. The fourth spacer P4 and the fifth spacer P5 are placed in the second barrel P02.

[0130] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Embodiment 4, 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 4 is that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, the first spacer P1, the first auxiliary spacer P1b, the second spacer P2, the fourth spacer P4 and the fifth spacer P5 are different.

[0131] Example 6

[0132] The following reference Figure 8 An optical imaging lens according to Example 6 of the present application is described.

[0133] like Figure 8 As shown, the optical imaging lens comprises a barrel assembly, an optical lens group and a spacer group. The barrel assembly comprises a first barrel P01 and a second barrel P02. The structure of the optical lens group is the same as that of the optical lens group of Example 4. The spacer group comprises a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The first spacer P1, the first auxiliary spacer P1b and the second spacer P2 are placed in the first barrel P01. The fourth spacer P4 and the fifth spacer P5 are placed in the second barrel P02.

[0134] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Embodiment 4, 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 4 is that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, the first spacer P1, the first auxiliary spacer P1b, the second spacer P2, the fourth spacer P4 and the fifth spacer P5 are different.

[0135] Fig.9A The axial chromatic aberration curve of the optical imaging lens of Example 4, 5 or 6 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig. 9B The astigmatism curves of the optical imaging lens of Example 4, 5 or 6 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Fig. 9C The distortion curves of the optical imaging lenses of Embodiments 4, 5 or 6 are shown, which represent the distortion values ​​corresponding to different field angles. 9A to 9C It can be seen that the optical imaging lens of Example 4, 5 or 6 can achieve good imaging quality.

[0136] Example 7

[0137] The following reference Fig.10An optical imaging lens according to Embodiment 7 of the present application is described.

[0138] like Fig.10 As shown, the optical imaging lens comprises a lens barrel assembly, an optical lens group and a spacer group. The lens barrel assembly comprises a first lens barrel P01 and a second lens barrel P02.

[0139] The optical lens group includes a first lens group placed in a first lens barrel P01 and a second lens group placed in a second lens barrel P02 and having negative optical power in order from the object side to the image side along the optical axis. The first lens group includes a first lens E1, a second lens E2 and a third lens E3. The second lens group includes a fourth lens E4, a fifth lens E5 and a sixth lens E6.

[0140] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has 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 positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. A filter is also arranged between the sixth lens E6 and the imaging surface S15, and 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 (not shown).

[0141] 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 first spacer P1, the first auxiliary spacer P1b and the second spacer P2 are placed in the first lens barrel P01. The fourth spacer P4 and the fifth spacer P5 are placed in the second lens barrel P02. The spacers can block the excess light in the imaging process from entering the next lens, and at the same time make the lens better supported by the first lens barrel P01 or the second lens barrel P02, thereby enhancing the structural stability of the optical imaging lens.

[0142] Table 7 shows the basic parameters of the optical imaging lens of Example 7, wherein the units of the radius of curvature, thickness / distance, focal length, and effective semi-aperture are all millimeters (mm).

[0143]

[0144]

[0145] Table 7

[0146] In this embodiment, the total effective focal length f of the optical imaging lens is 18.46 mm. The value of Semi-FOV, half of the maximum field of view angle of the optical imaging lens, is 17.37°. The combined focal length f123 of the first lens, the second lens, and the third lens is 12.27 mm. The combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens is -15.33 mm.

[0147] 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 8 lists the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A63, A70, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0148] Face number A4 A6 A8 A10 A12 A14 A16 S1 9.3628E-04 -6.2240E-04 2.5256E-04 -6.0762E-05 8.1124E-06 -3.6759E-07 -6.6051E-08 S2 4.4538E-03 -3.3752E-03 2.0190E-03 -7.8632E-04 2.0655E-04 -3.8188E-05 5.1009E-06 S3 -3.6028E-03 -3.4912E-03 2.2224E-03 -8.9437E-04 2.4315E-04 -4.6549E-05 6.4580E-06 S4 -1.0613E-03 -7.6465E-03 5.2749E-03 -2.3098E-03 6.9025E-04 -1.4539E-04 2.2083E-05 S5 5.0770E-03 -5.5672E-03 3.3741E-03 -1.3731E-03 3.8911E-04 -7.9084E-05 1.1760E-05 S6 3.7922E-04 -3.6514E-04 3.5342E-04 -2.2705E-04 9.8573E-05 -2.8996E-05 5.8972E-06 S7 1.1138E-02 -4.1283E-03 2.6722E-03 -1.4212E-03 5.5718E-04 -1.5931E-04 3.3278E-05 S8 1.1055E-02 -1.0290E-02 9.4301E-03 -5.5666E-03 2.2817E-03 -6.7738E-04 1.4814E-04 S9 -9.0391E-03 -5.4035E-03 6.4744E-03 -3.7620E-03 1.4891E-03 -4.3718E-04 9.7710E-05 S10 -1.1042E-02 -2.8817E-03 4.7961E-03 -3.4489E-03 1.6289E-03 -5.4434E-04 1.3277E-04 S11 -6.2656E-03 2.3564E-03 -2.2372E-03 1.5013E-03 -7.5421E-04 2.8339E-04 -7.8560E-05 S12 -1.6685E-03 -9.2664E-04 7.6255E-04 -3.6829E-04 1.1725E-04 -2.5759E-05 4.0195E-06 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.4712E-08 -1.4648E-09 8.9722E-11 -3.5636E-12 8.9887E-14 -1.3137E-15 8.4935E-18 S2 -4.9851E-07 3.5673E-08 -1.8479E-09 6.7411E-11 -1.6415E-12 2.3936E-14 -1.5801E-16 S3 -6.5988E-07 4.9843E-08 -2.7558E-09 1.0858E-10 -2.8886E-12 4.6525E-14 -3.4263E-16 S4 -2.4498E-06 1.9893E-07 -1.1705E-08 4.8603E-10 -1.3508E-11 2.2542E-13 -1.7073E-15 S5 -1.2921E-06 1.0488E-07 -6.2117E-09 2.6092E-10 -7.3578E-12 1.2478E-13 -9.6055E-16 S6 -8.4374E-07 8.5580E-08 -6.1228E-09 3.0224E-10 -9.7989E-12 1.8783E-13 -1.6134E-15 S7 -5.0818E-06 5.6491E-07 -4.5125E-08 2.5206E-09 -9.3416E-11 2.0635E-12 -2.0561E-14 S8 -2.3947E-05 2.8441E-06 -2.4434E-07 1.4741E-08 -5.9151E-10 1.4161E-11 -1.5295E-13 S9 -1.6580E-05 2.1011E-06 -1.9405E-07 1.2604E-08 -5.4349E-10 1.3934E-11 -1.6051E-13 S10 -2.3924E-05 3.1816E-06 -3.0802E-07 2.1078E-08 -9.6492E-10 2.6479E-11 -3.2904E-13 S11 1.5896E-05 -2.3250E-06 2.4215E-07 -1.7470E-08 8.2842E-10 -2.3201E-11 2.9055E-13 S12 -4.5235E-07 3.6836E-08 -2.1504E-09 8.7711E-11 -2.3729E-12 3.8249E-14 -2.7796E-16

[0149] Table 8

[0150] Example 8

[0151] The following reference Fig.11 An optical imaging lens according to Example 8 of the present application is described.

[0152] like Fig.11 As shown, the optical imaging lens comprises a barrel assembly, an optical lens group and a spacer group. The barrel assembly comprises a first barrel P01 and a second barrel P02. The structure of the optical lens group is the same as that of the optical lens group of Example 7. The spacer group comprises a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The first spacer P1, the first auxiliary spacer P1b and the second spacer P2 are placed in the first barrel P01. The fourth spacer P4 and the fifth spacer P5 are placed in the second barrel P02.

[0153] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Embodiment 7, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 7, and the aspheric coefficient table is the same as Table 8. The difference between this embodiment and Embodiment 7 is that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, the first spacer P1, the first auxiliary spacer P1b, the second spacer P2, the fourth spacer P4 and the fifth spacer P5 are different.

[0154] Example 9

[0155] The following reference Fig.12 An optical imaging lens according to Example 9 of the present application is described.

[0156] like Fig.12 As shown, the optical imaging lens comprises a barrel assembly, an optical lens group and a spacer group. The barrel assembly comprises a first barrel P01 and a second barrel P02. The structure of the optical lens group is the same as that of the optical lens group of Example 7. The spacer group comprises a first spacer P1, a first auxiliary spacer P1b, a second spacer P2, a fourth spacer P4 and a fifth spacer P5. The first spacer P1, the first auxiliary spacer P1b and the second spacer P2 are placed in the first barrel P01. The fourth spacer P4 and the fifth spacer P5 are placed in the second barrel P02.

[0157] The structure of the optical lens group of this embodiment is the same as that of the optical lens group of Embodiment 7, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 7, and the aspheric coefficient table is the same as Table 8. The difference between this embodiment and Embodiment 7 is that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, the first spacer P1, the first auxiliary spacer P1b, the second spacer P2, the fourth spacer P4 and the fifth spacer P5 are different.

[0158] Fig.13A The axial chromatic aberration curve of the optical imaging lens of Example 7, 8 or 9 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig. 13B The astigmatism curves of the optical imaging lens of Example 7, 8 or 9 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Fig. 13C The distortion curves of the optical imaging lenses of Embodiments 7, 8 or 9 are shown, which represent the distortion values ​​corresponding to different field angles. FIG. 13A to FIG. 13C It can be seen that the optical imaging lens of Example 7, 8 or 9 can achieve good imaging quality.

[0159] Table 9 shows the values ​​of parameters such as d1s, D1s, d2s, d2m, d4s, d4m, d5s, d5m, d01s, d01m, d02s, d02m, EP01, CP1, CP1b, EP12, CP4, EP45, CP5, L1, L2, SAG21, SAG22, SAG51, and SAG52 in each of Examples 1 to 9. Among them, some of the above parameters can be calculated according to Figure 1 The units of the parameters listed in Table 9 are all mm.

[0160]

[0161]

[0162] Table 9

[0163] Table 10 shows the values ​​of the conditional expressions of each of Examples 1 to 9.

[0164] Conditional / Example 1 2 3 4 5 6 7 8 9 (d4s+d5s) / f456 -0.99 -0.99 -1.00 -1.02 -1.01 -1.03 -0.89 -0.89 -0.90 CP4 / T45-CP5 / T56 0.43 0.43 0.79 0.72 0.72 0.72 0.25 0.24 0.46 d02s / DT41-d02m / DT62 -0.13 -0.13 -0.13 -0.13 -0.12 -0.16 -0.19 -0.20 -0.20 d01m / R6-d02s / R7 0.17 0.16 0.17 -0.09 -0.03 -0.08 -0.18 -0.23 -0.20 (d01s-d1s) / f1×V1 6.96 7.24 7.65 5.72 6.66 5.98 5.53 4.85 4.85 (D1s-d1s) / DT12 0.24 0.25 0.26 0.15 0.18 0.16 0.24 0.20 0.20 (EP01+EP12) / (f1+f2) 0.53 0.53 0.53 0.67 0.67 0.67 0.42 0.42 0.42 (CP1+CP1b) / T12 0.65 0.66 0.66 1.44 1.44 1.45 2.11 2.11 2.11 EP12 / (SAG21+SAG22) 1.34 1.34 1.34 1.66 1.66 1.66 1.47 1.47 1.47 d2m / DT31-d2s / DT22 -0.02 -0.02 -0.02 0.00 0.00 0.03 -0.01 -0.01 -0.01 (d4m-d5m) / CT5×N5 0.74 0.67 0.65 0.39 0.37 0.38 0.31 0.26 0.25 EP45 / (SAG51+SAG52) 2.42 2.42 2.42 4.78 4.78 4.78 4.29 4.29 4.29 f123 / L1+f456 / L2 -0.89 -0.89 -0.89 -0.93 -0.93 -0.93 -1.59 -1.59 -1.59

[0165] Table 10

[0166] 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.

[0167] 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 optical lens group, comprising a first lens group and a second lens group having negative optical power, which are 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; the second lens group includes a fourth lens with positive power, a fifth lens with negative power and a sixth lens with negative power; 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 group is disposed in the first lens barrel, and the second lens group, the fourth spacer and the fifth spacer are disposed in the second lens barrel; Wherein, the number of lenses having optical power of the optical imaging lens is six; The combined focal length f456 of the fourth lens, the fifth lens and the sixth 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: -1.1<(d4s+d5s) / f456<0; The air gap T45 between the fourth lens and the fifth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the maximum thickness CP4 of the fourth spacer and the maximum thickness CP5 of the fifth spacer satisfy: 0.2 <CP4 / T45-CP5 / T56<0.8。 2. The optical imaging lens according to claim 1, wherein: The effective aperture DT41 of the object side surface of the fourth lens, the effective aperture DT62 of the image side surface of the sixth lens, the inner diameter d02s of the object side end surface of the second lens barrel and the inner diameter d02m of the image side end surface of the second lens barrel satisfy: -0.3 <d02s / DT41-d02m / DT62<0。 3. The optical imaging lens according to claim 1, wherein: The curvature radius R6 of the image side surface of the third lens, the curvature radius R7 of the object side surface of the fourth lens, the inner diameter d01m of the image side end surface of the first lens barrel and the inner diameter d02s of the object side end surface of the second lens barrel satisfy: -0.3 <d01m / R6-d02s / R7<0.3。 4. The optical imaging lens according to claim 1, wherein: The center thickness CT5 of the fifth lens on the optical axis, the refractive index N5 of the fifth lens, the inner diameter d4m of the image side surface of the fourth spacer and the inner diameter d5m of the image side surface of the fifth spacer satisfy: 0.2<(d4m-d5m) / CT5×N5<0.

8.

5. The optical imaging lens according to claim 1, wherein: The on-axis distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the effective half-aperture vertex of the object side surface of the fifth lens, the on-axis distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis to the effective half-aperture vertex of the image side surface of the fifth lens, and the interval EP45 between the fourth spacer and the fifth spacer along the optical axis satisfy: 2 <EP45 / (SAG51+SAG52)<5。 6. The optical imaging lens according to claim 1, wherein: The combined focal length f123 of the first lens, the second lens and the third lens, the combined focal length f456 of the fourth lens, the fifth lens and the sixth lens, the length L1 of the first lens barrel along the direction of the optical axis and the length L2 of the second lens barrel along the direction of the optical axis satisfy: <f123 / L1+f456 / L2<-0.8。 7. The optical imaging lens according to any one of claims 1 to 6, characterized in that: The spacer set further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; The effective focal length f1 of the first lens, the Abbe number V1 of the first lens, the inner diameter d01s of the object side end surface of the first lens barrel and the inner diameter d1s of the object side surface of the first spacer satisfy: 4<(d01s-d1s) / f1×V1<8.

8. The optical imaging lens according to any one of claims 1 to 6, characterized in that: The spacer set further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; The effective aperture DT12 of the image side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer, and the outer diameter D1s of the object side surface of the first spacer satisfy: 0<(D1s-d1s) / DT12<0.

3.

9. The optical imaging lens according to any one of claims 1 to 6, characterized in that: The spacer set further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens, and a first auxiliary spacer disposed on the image side surface of the first spacer and in contact with the image side surface of the first spacer; The air gap T12 between the first lens and the second lens on the optical axis, the maximum thickness CP1 of the first spacer, and the maximum thickness CP1b of the first auxiliary spacer satisfy the following: 0.5<(CP1+CP1b) / T12<2.

5.

10. The optical imaging lens according to any one of claims 1 to 6, characterized in that: The spacer set further includes a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; The effective aperture DT22 of the image side surface of the second lens, the effective aperture DT31 of the object side surface of the third lens, the inner diameter d2s of the object side surface of the second spacer and the inner diameter d2m of the image side surface of the second spacer satisfy: -0.1 <d2m / DT31-d2s / DT22<0.1。 11. The optical imaging lens according to any one of claims 1 to 6, characterized in that: The spacer group further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens, and a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; Among them, the on-axis distance SAG21 between the intersection of the object side surface of the second lens and the optical axis to the effective half-aperture vertex of the object side surface of the second lens, the on-axis distance SAG22 between the intersection of the image side surface of the second lens and the optical axis to the effective half-aperture vertex of the image side surface of the second lens, and the interval EP12 between the first spacer and the second spacer along the optical axis satisfy: 1 <EP12 / (SAG21+SAG22)<2。 12. The optical imaging lens according to any one of claims 1 to 6, characterized in that: The spacer group further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens, and a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; Among them, the interval EP01 between the object side end surface of the first lens barrel and the first spacer along the optical axis, the interval EP12 between the first spacer and the second spacer along the optical axis, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 0.4<(EP01+EP12) / (f1+f2)<0.8.

Images