Optical imaging lens set

Abstract

The present invention provides an optical imaging lens group. The optical imaging lens group sequentially includes, from the object side to the image side along the optical axis of the optical imaging lens group: a first lens with a positive optical power; a second lens with an optical power, the image side surface of the second lens being concave; a third lens with an optical power; a fourth lens with an optical power, the image side surface of the fourth lens being concave; a fifth lens with an optical power; a sixth lens with an optical power, the image side surface of the sixth lens being concave; a seventh lens with a negative optical power; the maximum field of view FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group satisfy: tan(FOV / 2)*f > 5 mm; the radius of curvature R12 of the image side surface of the sixth lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: 1 < R12 / R14 < 2. The present invention solves the problem of poor imaging quality existing in the camera lens in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an optical imaging lens group. Background Art

[0002] Mobile phone cameras have experienced rapid growth along with the development of smartphones, from 8 megapixels in 2010 to 100 megapixels in 2020, and from single-camera lenses a few years ago to multi-camera combination lenses today. As one of the key members of multi-camera combination lenses, the main camera lens has gradually become the focus of continuous research and improvement by major mobile phone brands due to its high pixels and good overall picture shooting effect.

[0003] With the continuous development of portable electronic products such as smartphones, people have put forward higher requirements for the performance of mobile phone camera lens groups. Multi-lens camera lens groups provide more design freedom and provide greater possibilities for improving mobile phone performance. In the case of insufficient light (such as rainy days, dusk, etc.) and hand shaking, F numbers above 2.0 can no longer meet higher-level imaging requirements. In recent years, the main camera lens has gradually assumed the function of macro shooting, and major mobile phone terminals have increasingly higher requirements for the macro function of the lens.

[0004] That is to say, the camera lens in the prior art has the problem of poor imaging quality. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical imaging lens group to solve the problem of poor imaging quality of the camera lens in the prior art.

[0006] In order to achieve the above-mentioned object, according to one aspect of the present invention, an optical imaging lens group is provided, which includes, in order from the object side to the image side along the optical axis of the optical imaging lens group: a first lens with positive optical power; a second lens with optical power, the image side surface of the second lens is a concave surface; a third lens with optical power; a fourth lens with optical power, the image side surface of the fourth lens is a concave surface; a fifth lens with optical power; a sixth lens with optical power, the image side surface of the sixth lens is a concave surface; a seventh lens with negative optical power; the maximum field of view FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group satisfy the following relationship: tan(FOV / 2)*f>5mm; the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R14 of the image side surface of the seventh lens satisfy the following relationship: 1 <R12 / R14<2。

[0007] Furthermore, the optical imaging lens group is arranged on the electronic photosensitive element, and the distance TTL from the object side surface of the first lens to the imaging surface of the electronic photosensitive element on the optical axis and half of the diagonal length ImgH of the effective pixel area of ​​the electronic photosensitive element satisfy: TTL / ImgH<1.5.

[0008] Furthermore, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -2 <f6 / f7<-1。

[0009] Further, a curvature radius R2 of the image side surface of the first lens, a curvature radius R3 of the object side surface of the second lens, and a spacing distance T12 between the first lens and the second lens on the optical axis satisfy: |R2-R3| / T12<12.

[0010] Furthermore, a curvature radius R11 of the object-side surface of the sixth lens element and an effective focal length f of the optical imaging lens group satisfy: R11 / f<0.5.

[0011] Further, a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 100*|CT3-CT4|<10.

[0012] Further, a distance T45 between the fourth lens and the fifth lens on the optical axis and a distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: T45 / T56<1.5.

[0013] Furthermore, the on-axis spacing distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis satisfy: -1.5 <SAG62 / CT6<-0.9。

[0014] Furthermore, an effective half aperture DT11 of the object side surface of the first lens and half of the diagonal length ImgH of an effective pixel area of ​​the electronic photosensitive element satisfy DT11 / ImgH<0.4.

[0015] Furthermore, the effective half-aperture DT61 of the object side surface of the sixth lens, the effective half-aperture DT52 of the image side surface of the fifth lens, the effective half-aperture DT51 of the object side surface of the fifth lens and the effective half-aperture DT42 of the image side surface of the fourth lens satisfy: 2<(DT61-DT52) / (DT51-DT42)<20.

[0016] Furthermore, the edge thickness ET5 of the fifth lens and the center thickness CT5 of the fifth lens on the optical axis satisfy: 0.8 <ET5 / CT5<1.2。

[0017] Furthermore, the object side surface of the sixth lens and the image side surface of the sixth lens each have at least one critical point, and the critical point sag YT61 of the object side surface of the sixth lens closest to the optical axis and the critical point sag YT62 of the image side surface of the sixth lens closest to the optical axis satisfy: 0.8 <YT61 / YT62<1.3。

[0018] Furthermore, a distance OT from the object to the object side surface of the first lens on the optical axis and a distance TTL from the object side surface of the first lens to the imaging surface of the electronic photosensitive element on the optical axis satisfy: OT / TTL<30.

[0019] Further, the Abbe number V3 of the third lens element and the Abbe number V4 of the fourth lens element satisfy: V3>V4.

[0020] Furthermore, the maximum distortion DISTmax of the optical imaging lens group satisfies: 5%<|DISTmax|<50%.

[0021] According to another aspect of the present invention, an optical imaging lens group is provided, which includes, in order from the object side to the image side along the optical axis of the optical imaging lens group: a first lens with positive optical power; a second lens with optical power, the image side surface of the second lens is a concave surface; a third lens with optical power; a fourth lens with optical power, the image side surface of the fourth lens is a concave surface; a fifth lens with optical power; a sixth lens with optical power, the image side surface of the sixth lens is a concave surface; a seventh lens with negative optical power; the maximum field of view FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group satisfy the following conditions: tan(FOV / 2)*f>5mm; the spacing distance T67 between the sixth lens and the seventh lens on the optical axis and the spacing distance TD between the object side surface of the first lens and the image side surface of the seventh lens on the optical axis satisfy the following conditions: 1 <T67 / TD<2。

[0022] Furthermore, the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: 1 <R12 / R14<2。

[0023] Furthermore, the optical imaging lens group is arranged on the electronic photosensitive element, and the distance TTL from the object side surface of the first lens to the imaging surface of the electronic photosensitive element on the optical axis and half of the diagonal length ImgH of the effective pixel area of ​​the electronic photosensitive element satisfy: TTL / ImgH<1.5.

[0024] Furthermore, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -2 <f6 / f7<-1。

[0025] Further, a curvature radius R2 of the image side surface of the first lens, a curvature radius R3 of the object side surface of the second lens, and a spacing distance T12 between the first lens and the second lens on the optical axis satisfy: |R2-R3| / T12<12.

[0026] Furthermore, a curvature radius R11 of the object-side surface of the sixth lens element and an effective focal length f of the optical imaging lens group satisfy: R11 / f<0.5.

[0027] Further, a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 100*|CT3-CT4|<10.

[0028] Further, a distance T45 between the fourth lens and the fifth lens on the optical axis and a distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: T45 / T56<1.5.

[0029] Furthermore, the on-axis spacing distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis satisfy: -1.5 <SAG62 / CT6<-0.9。

[0030] Furthermore, an effective half aperture DT11 of the object side surface of the first lens and half of the diagonal length ImgH of an effective pixel area of ​​the electronic photosensitive element satisfy DT11 / ImgH<0.4.

[0031] Furthermore, the effective half-aperture DT61 of the object side surface of the sixth lens, the effective half-aperture DT52 of the image side surface of the fifth lens, the effective half-aperture DT51 of the object side surface of the fifth lens and the effective half-aperture DT42 of the image side surface of the fourth lens satisfy: 2<(DT61-DT52) / (DT51-DT42)<20.

[0032] Furthermore, the edge thickness ET5 of the fifth lens and the center thickness CT5 of the fifth lens on the optical axis satisfy: 0.8 <ET5 / CT5<1.2。

[0033] Furthermore, the object side surface of the sixth lens and the image side surface of the sixth lens each have at least one critical point, and the critical point sag YT61 of the object side surface of the sixth lens closest to the optical axis and the critical point sag YT62 of the image side surface of the sixth lens closest to the optical axis satisfy: 0.8 <YT61 / YT62<1.3。

[0034] Furthermore, a distance OT from the object to the object side surface of the first lens on the optical axis and a distance TTL from the object side surface of the first lens to the imaging surface of the electronic photosensitive element on the optical axis satisfy: OT / TTL<30.

[0035] Further, the Abbe number V3 of the third lens element and the Abbe number V4 of the fourth lens element satisfy: V3>V4.

[0036] Furthermore, the maximum distortion DISTmax of the optical imaging lens group satisfies: 5%<|DISTmax|<50%.

[0037] By applying the technical solution of the present invention, the optical imaging lens group includes, from the object side to the image side along the optical axis of the optical imaging lens group, a first lens with positive optical power, a second lens with optical power, a third lens with optical power, a fourth lens with optical power, a fifth lens with optical power, a sixth lens with optical power and a seventh lens with negative optical power; wherein the image side surface of the second lens is a concave surface, the image side surface of the fourth lens is a concave surface, and the image side surface of the sixth lens is a concave surface. The maximum field of view FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group satisfy: tan(FOV / 2)*f>5mm; the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: 1 <R12 / R14<2。

[0038] Through the reasonable arrangement of the optical power, the astigmatism and distortion can be effectively reduced, and the imaging quality of the optical imaging lens group can be greatly improved. The first lens with positive optical power, the second lens with optical power, and the image side surface of the second lens are concave. Such an arrangement is conducive to increasing the field of view angle, and is also conducive to compressing the incident angle of the light at the aperture STO, reducing the pupil aberration, and improving the imaging quality. The third lens with optical power, the fourth lens with optical power, and the image side surface of the fourth lens are concave. Such an arrangement is conducive to reducing the spherical aberration and astigmatism of the optical imaging lens group. The fifth lens with optical power, the sixth lens with optical power, and the image side surface of the sixth lens are concave. Such an arrangement is conducive to ensuring that the optical imaging lens group has the characteristics of compact structure, large aperture and good imaging quality, and at the same time ensures that the optical imaging lens group has loose processing characteristics. The seventh lens with negative optical power is arranged in such a way that it is conducive to reasonably controlling the contribution of spherical aberration within a reasonable range, so that the on-axis field of view can obtain good imaging quality, and at the same time can realize the characteristics of a large image surface, so that the external field of view obtains a higher light flux. The maximum field of view FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group satisfy: tan(FOV / 2)*f>5mm, and this setting ensures the large image surface characteristics of the optical imaging lens group. By reasonably controlling the ratio of the curvature radius R12 of the image side surface of the sixth lens to the curvature radius R14 of the image side surface of the seventh lens, the assembly step difference of the sixth lens and the seventh lens can be effectively controlled within a reasonable range, which is convenient for processing and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0040] Figure 1 A schematic diagram showing the structure of an optical imaging lens assembly according to Example 1 of the present invention is shown;

[0041] Figures 2 to 4 They are shown respectively Figure 1 The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens group;

[0042] Figure 5 A schematic diagram showing the structure of an optical imaging lens assembly according to Example 2 of the present invention is shown;

[0043] Figures 6 to 8 They are shown respectively Figure 5 The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens group;

[0044] Fig. 9 A schematic diagram showing the structure of an optical imaging lens assembly according to Example 3 of the present invention is shown;

[0045] Figures 10 to 12 They are shown respectively Fig. 9 The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens group;

[0046] Fig.13 A schematic diagram showing the structure of an optical imaging lens assembly according to Example 4 of the present invention is shown;

[0047] Figures 14 to 16 They are shown respectively Fig.13 The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens group;

[0048] Fig.17 A schematic diagram showing the structure of an optical imaging lens assembly according to Example 5 of the present invention is shown;

[0049] Figures 18 to 20 They are shown respectively Fig.17 The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens group;

[0050] Fig.21 A schematic diagram showing the structure of an optical imaging lens assembly according to Example 6 of the present invention is shown;

[0051] Figure 22 to Figure 24 They are shown respectively Fig.21 The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens group.

[0052] The above drawings include the following reference numerals:

[0053] STO, aperture; E1, first lens; S1, object-side surface of the first lens; S2, image-side surface of the first lens; E2, second lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; E3, third lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; E4, fourth lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; E6, sixth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; E7, seventh lens; S13, object-side surface of the seventh lens; S14, image-side surface of the seventh lens; E8, filter; S15, object-side surface of the filter; S16, image-side surface of the filter; S17, imaging surface. DETAILED DESCRIPTION

[0054] 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 invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0055] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0056] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0057] 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.

[0058] 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 those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0059] 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 close to the object side is called the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The judgment of the surface shape in the paraxial region can be based on the judgment method of the general knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial region, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the concave and convex. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0060] In order to solve the problem of poor imaging quality of camera lenses in the prior art, the present invention provides an optical imaging lens group.

[0061] Embodiment 1

[0062] like Figures 1 to 24 As shown, the optical imaging lens group includes a first lens E1 with positive optical power, a second lens E2 with optical power, a third lens E3 with optical power, a fourth lens E4 with optical power, a fifth lens E5 with optical power, a sixth lens E6 with optical power and a seventh lens E7 with negative optical power along the optical axis of the optical imaging lens group from the object side to the image side; wherein the image side surface S4 of the second lens is a concave surface, the image side surface S8 of the fourth lens is a concave surface, and the image side surface S12 of the sixth lens is a concave surface. The maximum field of view FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group satisfy: tan(FOV / 2)*f>5mm; the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: 1 <R12 / R14<2。

[0063] Through the reasonable arrangement of optical focal power, astigmatism and distortion can be effectively reduced, and the imaging quality of the optical imaging lens group can be greatly improved. The first lens E1 with positive optical focal power, the second lens E2 with optical focal power, and the image side surface S4 of the second lens are concave. Such an arrangement is conducive to increasing the field of view angle, and is also conducive to compressing the incident angle of the light at the aperture STO, reducing pupil aberration, and improving imaging quality. The third lens E3 with optical focal power, the fourth lens E4 with optical focal power, and the image side surface S8 of the fourth lens are concave. Such an arrangement is conducive to reducing the spherical aberration and astigmatism of the optical imaging lens group. The fifth lens E5 with optical focal power, the sixth lens E6 with optical focal power, and the image side surface S12 of the sixth lens are concave. Such an arrangement is conducive to ensuring that the optical imaging lens group has the characteristics of compact structure, large aperture and good imaging quality, while ensuring that the optical imaging lens group has loose processing characteristics. The seventh lens E7 with negative focal power is arranged in such a way that it is conducive to reasonably controlling the contribution of spherical aberration within a reasonable range, so that the on-axis field of view can obtain good imaging quality, and at the same time, it can realize the characteristics of a large image surface, so that the external field of view obtains a higher light flux. The maximum field of view angle FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group satisfy: tan(FOV / 2)*f>5mm. Such an arrangement ensures the large image surface characteristics of the optical imaging lens group. By reasonably controlling the ratio of the radius of curvature R12 of the image side surface of the sixth lens to the radius of curvature R14 of the image side surface of the seventh lens, the assembly step difference of the sixth lens E6 and the seventh lens E7 can be effectively controlled within a reasonable range, which is convenient for processing and assembly.

[0064] Preferably, the maximum field of view FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group can satisfy: 5.3 mm <tan(FOV / 2)*f<5.4mm。

[0065] Preferably, the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R14 of the image side surface of the seventh lens satisfy the following relationship: 1.1 <R12 / R14<1.5。

[0066] In this embodiment, the optical imaging lens group is arranged on the electronic photosensitive element, and the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the electronic photosensitive element and half of the diagonal length of the effective pixel area of ​​the electronic photosensitive element ImgH satisfy: TTL / ImgH<1.5. Preferably, the ratio between the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the electronic photosensitive element and half of the diagonal length of the effective pixel area of ​​the electronic photosensitive element ImgH is 1.24. Such a setting is conducive to ensuring the ultra-thin characteristics of the optical imaging lens group.

[0067] In this embodiment, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -2 < f6 / f7 < -1. Preferably, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens can satisfy: -1.9 < f6 / f7 < -1.2. Such a setting can reasonably control the spherical aberration contributions of the seventh lens E7 and the sixth lens E6 within a reasonable range, which is beneficial to ensuring good imaging quality in the on-axis field of view.

[0068] In this embodiment, the radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens, and the axial distance T12 between the first lens and the second lens satisfy: |R2 - R3| / T12 < 12. Preferably, the radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens, and the axial distance T12 between the first lens and the second lens satisfy: 1.6 < |R2 - R3| / T12 < 10.7. Such a setting can effectively control the shape of the first lens E1 and the distance from the second lens E2, so that the shapes of the first lens E1 and the second lens E2 can better complement each other, improve spherical aberration, and further improve the imaging quality of the optical imaging lens group.

[0069] In this embodiment, the radius of curvature R11 of the object side of the sixth lens and the effective focal length f of the optical imaging lens group satisfy: R11 / f < 0.5. Preferably, the radius of curvature R11 of the object side of the sixth lens and the effective focal length f of the optical imaging lens group satisfy: 0.3 < R11 / f < 0.5. Such a setting is beneficial to the reasonable arrangement of the optical power of the sixth lens E6, is beneficial to controlling the spherical aberration contributed by the sixth lens E6 within a reasonable range, facilitates the correction of spherical aberration, and ensures the imaging quality of the on-axis field of view of the optical imaging lens group.

[0070] In this embodiment, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: 100*|CT3 - CT4| < 10. Preferably, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0 < 100*|CT3 - CT4| < 3.6. Such a setting can effectively control the shapes of the third lens E3 and the fourth lens E4, make the thicknesses of the third lens E3 and the fourth lens E4 more uniform, and facilitate molding and processing.

[0071] In this embodiment, the distance T45 between the fourth lens and the fifth lens on the optical axis and the distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: T45 / T56 < 1.5. Preferably, the distance T45 between the fourth lens and the fifth lens on the optical axis and the distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.4 < T45 / T56 < 1.2. Such a setting enables the fourth lens E4, the fifth lens E5, and the sixth lens E6 to be reasonably distributed in the optical imaging lens group, which is beneficial to reducing the assembly step difference between the lenses and facilitating assembly.

[0072] In this embodiment, the distance T67 between the sixth lens and the seventh lens on the optical axis and the distance TD between the object side of the first lens and the image side of the seventh lens on the axis satisfy: 1 < T67 / TD < 2. Preferably, the distance T67 between the sixth lens and the seventh lens on the optical axis and the distance TD between the object side of the first lens and the image side of the seventh lens on the axis satisfy: 1.3 < T67 / TD < 1.5. Such a setting can effectively control the reasonable distribution of each lens in the optical imaging lens group and facilitate assembly.

[0073] In this embodiment, the axial distance SAG62 between the intersection point of the image side of the sixth lens and the optical axis and the vertex of the effective radius of the image side of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: -1.5 < SAG62 / CT6 < -0.9. Preferably, the axial distance SAG62 between the intersection point of the image side of the sixth lens and the optical axis and the vertex of the effective radius of the image side of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: -1.2 < SAG62 / CT6 < -1. Such a setting can reasonably control the incident angle of the chief ray of each field of view on the imaging surface S17 and meet the requirements of the optical system design CRA (Chief Ray Angle).

[0074] In this embodiment, the effective semi-aperture DT11 of the object side of the first lens and half of the diagonal length ImgH of the effective pixel region of the electronic photosensitive element satisfy: DT11 / ImgH < 0.4. Preferably, the effective semi-aperture DT11 of the object side of the first lens and half of the diagonal length ImgH of the effective pixel region of the electronic photosensitive element satisfy: 0.2 < DT11 / ImgH < 0.4. Such a setting is beneficial to increasing the field of view angle. At the same time, it is also beneficial to compressing the incident angle of the light rays at the aperture STO, reducing the pupil aberration, and improving the imaging quality.

[0075] In this embodiment, the effective semi-aperture DT61 of the object side of the sixth lens, the effective semi-aperture DT52 of the image side of the fifth lens, the effective semi-aperture DT51 of the object side of the fifth lens, and the effective semi-aperture DT42 of the image side of the fourth lens satisfy: 2 < (DT61 - DT52) / (DT51 - DT42) < 20. Preferably, the effective semi-aperture DT61 of the object side of the sixth lens, the effective semi-aperture DT52 of the image side of the fifth lens, the effective semi-aperture DT51 of the object side of the fifth lens, and the effective semi-aperture DT42 of the image side of the fourth lens satisfy: 2.9 < (DT61 - DT52) / (DT51 - DT42) < 11.5. Such a setting can effectively restrict the apertures of the fourth lens E4, the fifth lens E5, and the sixth lens E6, ensure that the assembly step difference of the optical imaging lens group is within a reasonable processing range, facilitate molding and assembly, and at the same time is conducive to obtaining a higher light transmission amount in the outer field of view.

[0076] In this embodiment, the edge thickness ET5 of the fifth lens and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.8 < ET5 / CT5 < 1.2. Preferably, the edge thickness ET5 of the fifth lens and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.8 < ET5 / CT5 < 1.1. Such a setting makes the thickness of the fifth lens E5 more uniform, facilitating molding and processing.

[0077] In this embodiment, each of the object side S11 and the image side S12 of the sixth lens has at least one critical point. The sagittal height YT61 of the critical point on the object side of the sixth lens closest to the optical axis and the sagittal height YT62 of the critical point on the image side of the sixth lens closest to the optical axis satisfy: 0.8 < YT61 / YT62 < 1.3. Preferably, each of the object side and the image side of the sixth lens has at least one critical point. The sagittal height YT61 of the critical point on the object side of the sixth lens closest to the optical axis and the sagittal height YT62 of the critical point on the image side of the sixth lens closest to the optical axis satisfy: 0.9 < YT61 / YT62 < 1.2. Such a setting can effectively control the field curvature and distortion of the optical imaging lens group, enabling good imaging quality to be obtained under different object distance conditions.

[0078] In this embodiment, the distance OT on the optical axis from the object to the object side of the first lens and the spacing TTL on the optical axis from the object side of the first lens to the imaging surface of the electronic photosensitive element satisfy: OT / TTL < 30. Preferably, the distance OT on the optical axis from the object to the object side of the first lens and the spacing TTL on the optical axis from the object side of the first lens to the imaging surface of the electronic photosensitive element satisfy: 13.8 < OT / TTL < 27.8. Such a setting can effectively ensure the structural feasibility of the optical imaging lens group and lower system sensitivity.

[0079] In this embodiment, the Abbe number V3 of the third lens and the Abbe number V4 of the fourth lens satisfy: V3>V4. This arrangement facilitates the selection of lens materials, and can reasonably control the spherical aberration contribution of the third lens E3 and the fourth lens E4 within a reasonable range, so that the on-axis field of view obtains good imaging quality, and at the same time can achieve a large image plane characteristic, which is conducive to obtaining a higher light flux in the external field of view.

[0080] In this embodiment, the maximum distortion DISTmax of the optical imaging lens group satisfies: 5%<|DISTmax|<50%. Preferably, the maximum distortion DISTmax of the optical imaging lens group satisfies: 7.7%<|DISTmax|<8.1%. Such a setting is conducive to increasing the field of view angle, so that better imaging quality can be obtained under different object distance conditions.

[0081] Embodiment 2

[0082] The present invention provides an optical imaging lens group, which comprises, from the object side to the image side along the optical axis of the optical imaging lens group, a first lens with positive optical power, a second lens with optical power, a third lens with optical power, a fourth lens with optical power, a fifth lens with optical power, a sixth lens with optical power and a seventh lens with negative optical power; the image side surface of the second lens is a concave surface; the image side surface of the fourth lens is a concave surface; the image side surface of the sixth lens is a concave surface; the maximum field angle FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group satisfy: tan(FOV / 2)*f>5mm; the spacing distance T67 between the sixth lens and the seventh lens on the optical axis and the spacing distance TD between the object side surface of the first lens and the image side surface of the seventh lens on the optical axis satisfy: 1 <T67 / TD<2。

[0083] Through the reasonable arrangement of the optical power, astigmatism and distortion can be effectively reduced, and the imaging quality of the optical imaging lens group can be greatly improved. The first lens E1 has a positive optical power, the second lens E2 has an optical power, and the image side S4 of the second lens is concave. Such a setting is beneficial to increasing the field of view angle and also beneficial to compressing the incident angle of the light rays at the aperture STO, reducing the pupil aberration, and improving the imaging quality. The third lens E3 has an optical power, the fourth lens E4 has an optical power, and the image side S8 of the fourth lens is concave. Such a setting is beneficial to reducing the spherical aberration and astigmatism of the optical imaging lens group. The fifth lens E5 has an optical power, the sixth lens E6 has an optical power, and the image side S12 of the sixth lens is concave. Such a setting is beneficial to ensuring that the optical imaging lens group has the characteristics of a compact structure, a large aperture, and good imaging quality, and at the same time ensuring that the optical imaging lens group has loose processing characteristics. The seventh lens E7 has a negative optical power. Such a setting is beneficial to reasonably controlling the contribution amount of spherical aberration within a reasonable range, enabling good imaging quality to be obtained in the on-axis field of view, and at the same time enabling the characteristics of a large image plane to be realized, so that a higher light passing amount can be obtained in the off-axis field of view. The maximum field of view angle FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group satisfy: tan(FOV / 2)*f > 5 mm. Such a setting ensures the characteristics of a large image plane of the optical imaging lens group. The spacing distance T67 between the sixth lens and the seventh lens on the optical axis and the spacing distance TD between the object side of the first lens and the image side of the seventh lens on the optical axis satisfy: 1 < T67 / TD < 2. Such a setting can effectively control the reasonable distribution of each lens in the optical imaging lens group and facilitate assembly.

[0084] Preferably, the maximum field of view angle FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group may satisfy: 5.3 mm < tan(FOV / 2)*f < 5.4 mm.

[0085] Preferably, the spacing distance T67 between the sixth lens and the seventh lens on the optical axis and the spacing distance TD between the object side of the first lens and the image side of the seventh lens on the axis satisfy: 1.3 < T67 / TD < 1.5.

[0086] In this embodiment, the radius of curvature R12 of the image side of the sixth lens and the radius of curvature R14 of the image side of the seventh lens satisfy: 1 < R12 / R14 < 2. Preferably, the radius of curvature R12 of the image side of the sixth lens and the radius of curvature R14 of the image side of the seventh lens satisfy: 1.1 < R12 / R14 < 1.5. By reasonably controlling the ratio of the radius of curvature R12 of the image side of the sixth lens to the radius of curvature R14 of the image side of the seventh lens, the assembly step difference between the sixth lens E6 and the seventh lens E7 can be effectively controlled within a reasonable range, facilitating processing and assembly.

[0087] In this embodiment, the optical imaging lens group is disposed on the electronic photosensitive element, and the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the electronic photosensitive element and half of the diagonal length ImgH of the effective pixel region of the electronic photosensitive element satisfy: TTL / ImgH < 1.5. Preferably, the ratio between the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the electronic photosensitive element and half of the diagonal length ImgH of the effective pixel region of the electronic photosensitive element is 1.24. Such a setting is beneficial to ensuring the ultra-thin characteristics of the optical imaging lens group.

[0088] In this embodiment, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -2 < f6 / f7 < -1. Preferably, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens can satisfy: -1.9 < f6 / f7 < -1.2. Such a setting can reasonably control the spherical aberration contributions of the seventh lens E7 and the sixth lens E6 within a reasonable range, which is beneficial to ensuring good imaging quality in the on-axis field of view.

[0089] In this embodiment, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, and the distance T12 between the first lens and the second lens on the optical axis satisfy: |R2 - R3| / T12 < 12. Preferably, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, and the distance T12 between the first lens and the second lens on the optical axis satisfy: 1.6 < |R2 - R3| / T12 < 10.7. Such a setting can effectively control the shape of the first lens E1 and the distance from the second lens E2, so that the shapes of the first lens E1 and the second lens E2 can better complement each other, improve spherical aberration, and further improve the imaging quality of the optical imaging lens group.

[0090] In this embodiment, the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f of the optical imaging lens group satisfy: R11 / f < 0.5. Preferably, the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f of the optical imaging lens group satisfy: 0.3 < R11 / f < 0.5. Such a setting is beneficial to the reasonable arrangement of the optical power of the sixth lens E6, beneficial to controlling the spherical aberration contributed by the sixth lens E6 within a reasonable range, facilitating the correction of spherical aberration, and ensuring the imaging quality of the on-axis field of view of the optical imaging lens group.

[0091] In this embodiment, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: 100 * |CT3 - CT4| < 10. Preferably, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0 < 100 * |CT3 - CT4| < 3.6. Such a setting can effectively control the shapes of the third lens E3 and the fourth lens E4, making the thicknesses of the third lens E3 and the fourth lens E4 more uniform, which is convenient for molding and processing.

[0092] In this embodiment, the interval distance T45 between the fourth lens and the fifth lens on the optical axis and the interval distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: T45 / T56 < 1.5. Preferably, the interval distance T45 between the fourth lens and the fifth lens on the optical axis and the interval distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.4 < T45 / T56 < 1.2. Such a setting enables the fourth lens E4, the fifth lens E5, and the sixth lens E6 to be reasonably distributed in the optical imaging lens group, which is beneficial to reducing the assembly step difference between the lenses and facilitating assembly.

[0093] In this embodiment, the axial interval distance SAG62 between the intersection point of the image side of the sixth lens and the optical axis and the vertex of the effective radius of the image side of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: -1.5 < SAG62 / CT6 < -0.9. Preferably, the axial interval distance SAG62 between the intersection point of the image side of the sixth lens and the optical axis and the vertex of the effective radius of the image side of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: -1.2 < SAG62 / CT6 < -1. Such a setting can reasonably control the incident angle of the chief ray of each field of view on the imaging surface S17, meeting the requirements of the optical system design CRA (Chief Ray Angle).

[0094] In this embodiment, the effective semi-aperture DT11 of the object side of the first lens and half of the diagonal length ImgH of the effective pixel region of the electronic photosensitive element satisfy DT11 / ImgH < 0.4. Preferably, the effective semi-aperture DT11 of the object side of the first lens and half of the diagonal length ImgH of the effective pixel region of the electronic photosensitive element satisfy 0.2 < DT11 / ImgH < 0.4. Such a setting is beneficial to increasing the field of view angle. At the same time, it is also beneficial to compressing the incident angle of the light rays at the aperture STO, reducing the pupil aberration, and improving the imaging quality.

[0095] In this embodiment, the following relationship is satisfied among the effective semi-aperture DT61 of the object side of the sixth lens, the effective semi-aperture DT52 of the image side of the fifth lens, the effective semi-aperture DT51 of the object side of the fifth lens, and the effective semi-aperture DT42 of the image side of the fourth lens: 2 < (DT61 - DT52) / (DT51 - DT42) < 20. Preferably, the following relationship is satisfied among the effective semi-aperture DT61 of the object side of the sixth lens, the effective semi-aperture DT52 of the image side of the fifth lens, the effective semi-aperture DT51 of the object side of the fifth lens, and the effective semi-aperture DT42 of the image side of the fourth lens: 2.9 < (DT61 - DT52) / (DT51 - DT42) < 11.5. Such a setting can effectively restrict the apertures of the fourth lens E4, the fifth lens E5, and the sixth lens E6, ensure that the assembly step difference of the optical imaging lens group is within a reasonable processing range, facilitate molding processing and assembly, and at the same time is beneficial to obtaining a higher light transmission amount in the outer field of view.

[0096] In this embodiment, the following relationship is satisfied between the edge thickness ET5 of the fifth lens and the central thickness CT5 of the fifth lens on the optical axis: 0.8 < ET5 / CT5 < 1.2. Preferably, the following relationship is satisfied between the edge thickness ET5 of the fifth lens and the central thickness CT5 of the fifth lens on the optical axis: 0.8 < ET5 / CT5 < 1.1. Such a setting makes the thickness of the fifth lens E5 more uniform, facilitating molding and processing.

[0097] In this embodiment, there is at least one critical point on each of the object side and the image side of the sixth lens. The following relationship is satisfied between the sagittal height YT61 of the critical point closest to the optical axis on the object side of the sixth lens and the sagittal height YT62 of the critical point closest to the optical axis on the image side of the sixth lens: 0.8 < YT61 / YT62 < 1.3. Preferably, there is at least one critical point on each of the object side and the image side of the sixth lens. The following relationship is satisfied between the sagittal height YT61 of the critical point closest to the optical axis on the object side of the sixth lens and the sagittal height YT62 of the critical point closest to the optical axis on the image side of the sixth lens: 0.9 < YT61 / YT62 < 1.2. Such a setting can effectively control the field curvature and distortion of the optical imaging lens group, enabling better imaging quality under different object distance conditions.

[0098] In this embodiment, the following relationship is satisfied between the distance OT on the optical axis from the object to the object side of the first lens and the spacing TTL on the optical axis from the object side of the first lens to the imaging surface of the electronic photosensitive element: OT / TTL < 30. Preferably, the following relationship is satisfied between the distance OT on the optical axis from the object to the object side of the first lens and the spacing TTL on the optical axis from the object side of the first lens to the imaging surface of the electronic photosensitive element: 13.8 < OT / TTL < 27.8. Such a setting can effectively ensure the structural feasibility of the optical imaging lens group and lower system sensitivity.

[0099] In this embodiment, the Abbe number V3 of the third lens and the Abbe number V4 of the fourth lens satisfy: V3>V4. This arrangement facilitates the selection of lens materials, and can reasonably control the spherical aberration contribution of the third lens E3 and the fourth lens E4 within a reasonable range, so that the on-axis field of view obtains good imaging quality, and at the same time can achieve a large image plane characteristic, which is conducive to obtaining a higher light flux in the external field of view.

[0100] In this embodiment, the maximum distortion DISTmax of the optical imaging lens group satisfies: 5%<|DISTmax|<50%. Preferably, the maximum distortion DISTmax of the optical imaging lens group satisfies: 7.7%<|DISTmax|<8.1%. Such a setting is conducive to increasing the field of view angle, so that better imaging quality can be obtained under different object distance conditions.

[0101] The optical imaging lens group may further include at least one aperture STO to improve the imaging quality of the optical imaging lens group. Optionally, the aperture STO may be arranged before the first lens E1. Optionally, the optical imaging lens group may further include a filter E8 for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0102] The optical imaging lens group in the present application may use multiple lenses, such as the seven lenses mentioned above. By reasonably allocating the optical power, surface shape, center thickness of each lens, and axial distance between each lens, etc., the aperture of the optical imaging lens group can be effectively increased, the sensitivity of the optical imaging lens group can be reduced, and the processability of the optical imaging lens group can be improved, making the optical imaging lens group more conducive to production and processing and applicable to portable electronic devices such as smart phones. The above-mentioned optical imaging lens group also has the advantages of large aperture, ultra-thinness, and good imaging quality, which can meet the needs of miniaturization of smart electronic products.

[0103] In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror 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 using an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0104] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens group can be changed to obtain the various results and advantages described in this specification. For example, although seven lenses are used as an example in the embodiments, the optical imaging lens group is not limited to including seven lenses. If necessary, the optical imaging lens group may also include other numbers of lenses.

[0105] The following further describes examples of specific surface shapes and parameters of the optical imaging lens group applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0106] It should be noted that any one of the following examples 1 to 6 is applicable to all embodiments of the present application.

[0107] Example 1

[0108] like Figures 1 to 4 As shown, the optical imaging lens group of Example 1 of the present application is described. Figure 1 A schematic structural diagram of the optical imaging lens group of Example 1 is shown.

[0109] like Figure 1 As shown, the optical imaging lens group includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0110] The first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is concave. Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0111] In this example, the total effective focal length f of the optical imaging lens group is 6.06 mm, the maximum field of view FOV of the optical imaging lens group is 83.23°, the distance TTL from the object side of the first lens to the imaging surface of the electronic photosensitive element on the optical axis is 7.20 mm, and half of the diagonal length of the effective pixel area of ​​the electronic photosensitive element ImgH is 5.80 mm.

[0112] Table 1 shows a basic structural parameter table of the optical imaging lens assembly of Example 1, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0113]

[0114]

[0115] Table 1

[0116] In Example 1, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0117]

[0118] 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 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each aspheric mirror surface S1-S14 in Example 1.

[0119]

[0120]

[0121] Table 2

[0122] Figure 2 The axial chromatic aberration curve of the optical imaging lens assembly of Example 1 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens assembly. Figure 3 An astigmatism curve of the optical imaging lens group of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 4 The distortion curve of the optical imaging lens assembly of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0123] according to Figures 2 to 4 It can be seen that the optical imaging lens group given in Example 1 can achieve good imaging quality.

[0124] Example 2

[0125] like Figures 5 to 8 As shown, the optical imaging lens assembly of Example 2 of the present application is described. In this example and the following examples, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Figure 5 A schematic structural diagram of the optical imaging lens group of Example 2 is shown.

[0126] like Figure 5As shown, the optical imaging lens group includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0127] The first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is concave. Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0128] In this example, the total effective focal length f of the optical imaging lens group is 6.04 mm, the maximum field of view FOV of the optical imaging lens group is 83.20°, the distance TTL from the object side of the first lens to the imaging surface of the electronic photosensitive element on the optical axis is 7.20 mm, and half of the diagonal length of the effective pixel area of ​​the electronic photosensitive element ImgH is 5.80 mm.

[0129] Table 3 shows the basic structural parameters of the optical imaging lens assembly of Example 2, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0130]

[0131] Table 3

[0132] Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0133]

[0134]

[0135] Table 4

[0136] Figure 6The axial chromatic aberration curve of the optical imaging lens assembly of Example 1 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens assembly. Figure 7 An astigmatism curve of the optical imaging lens group of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 8 The distortion curve of the optical imaging lens assembly of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0137] according to Figures 6 to 8 It can be seen that the optical imaging lens assembly provided in Example 2 can achieve good imaging quality.

[0138] Example 3

[0139] like Figures 9 to 12 As shown, the optical imaging lens assembly of Example 3 of the present application is described. In this example and the following examples, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Fig. 9 A schematic structural diagram of the optical imaging lens group of Example 3 is shown.

[0140] like Fig. 9 As shown, the optical imaging lens group includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0141] The first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is concave. Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0142] In this example, the total effective focal length f of the optical imaging lens group is 6.06 mm, the maximum field of view FOV of the optical imaging lens group is 83.15°, the distance TTL from the object side of the first lens to the imaging surface of the electronic photosensitive element on the optical axis is 7.20 mm, and half of the diagonal length of the effective pixel area of ​​the electronic photosensitive element ImgH is 5.80 mm.

[0143] Table 5 shows a basic structural parameter table of the optical imaging lens group of Example 3, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0144]

[0145] Table 5

[0146] Table 6 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 1.

[0147]

[0148]

[0149] Table 6

[0150] Fig.10 The axial chromatic aberration curve of the optical imaging lens group of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens group. Fig.11 The astigmatism curve of the optical imaging lens group of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.12 The distortion curve of the optical imaging lens group of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0151] according to Figures 10 to 12 It can be seen that the optical imaging lens group given in Example 3 can achieve good imaging quality.

[0152] Example 4

[0153] like Figures 13 to 16 As shown, the optical imaging lens assembly of Example 4 of the present application is described. In this example and the following examples, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Fig.13 A schematic diagram of the structure of the optical imaging lens group of Example 4 is shown.

[0154] like Fig.13 As shown, the optical imaging lens group includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0155] The first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is concave. Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0156] In this example, the total effective focal length f of the optical imaging lens group is 6.06 mm, the maximum field of view FOV of the optical imaging lens group is 83.31°, the distance TTL from the object side of the first lens to the imaging surface of the electronic photosensitive element on the optical axis is 7.20 mm, and half of the diagonal length of the effective pixel area of ​​the electronic photosensitive element ImgH is 5.80 mm.

[0157] Table 7 shows the basic structural parameter table of the optical imaging lens group of Example 4, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0158]

[0159] Table 7

[0160] Table 8 shows the high-order coefficients that can be used for each aspheric mirror surface in Example 4, where each aspheric surface shape can be defined by formula (1) given in the above Example 1.

[0161]

[0162]

[0163] Table 8

[0164] Fig.14 The axial chromatic aberration curve of the optical imaging lens group of Example 4 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens group. Fig.15 An astigmatism curve of the optical imaging lens group of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.16 The distortion curve of the optical imaging lens assembly of Example 4 is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figures 14 to 16 It can be seen that the optical imaging lens group given in Example 4 can achieve good imaging quality.

[0165] according to Figures 14 to 16 It can be seen that the optical imaging lens group given in Example 4 can achieve good imaging quality.

[0166] Example 5

[0167] like Figures 17 to 20 As shown, the optical imaging lens assembly of Example 5 of the present application is described. In this example and the following examples, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Fig.17 A schematic structural diagram of the optical imaging lens group of Example 5 is shown.

[0168] like Fig.17 As shown, the optical imaging lens group includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0169] The first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is concave. Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0170] In this example, the total effective focal length f of the optical imaging lens group is 6.06 mm, the maximum field of view FOV of the optical imaging lens group is 83.22°, the distance TTL from the object side of the first lens to the imaging surface of the electronic photosensitive element on the optical axis is 7.20 mm, and half of the diagonal length of the effective pixel area of ​​the electronic photosensitive element ImgH is 5.80 mm.

[0171] Table 9 shows the basic structural parameter table of the optical imaging lens group of Example 5, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0172]

[0173] Table 9

[0174] Table 10 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 5, where each aspherical surface shape can be defined by formula (1) given in the above Example 1.

[0175]

[0176]

[0177] Table 10

[0178] Fig.18 The axial chromatic aberration curve of the optical imaging lens group of Example 5 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens group. Fig.19 An astigmatism curve of the optical imaging lens group of Example 5 is shown, which indicates meridional image curvature and sagittal image curvature. Fig. 20 The distortion curve of the optical imaging lens group of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0179] according to Figures 18 to 20 It can be seen that the optical imaging lens group given in Example 5 can achieve good imaging quality.

[0180] Example 6

[0181] like Figure 21 to Figure 24 As shown, the optical imaging lens assembly of Example 6 of the present application is described. In this example and the following examples, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Fig.21 A schematic diagram of the structure of the optical imaging lens group of Example 6 is shown.

[0182] like Fig.21 As shown, the optical imaging lens group includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0183] The first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has positive focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is concave. Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0184] In this example, the total effective focal length f of the optical imaging lens group is 6.06 mm, the maximum field of view FOV of the optical imaging lens group is 83.00°, the distance TTL from the object side of the first lens to the imaging surface of the electronic photosensitive element on the optical axis is 7.20 mm, and half of the diagonal length of the effective pixel area of ​​the electronic photosensitive element ImgH is 5.80 mm.

[0185] Table 11 shows the basic structural parameter table of the optical imaging lens group of Example 6, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0186]

[0187] Table 11

[0188] Table 12 shows the high-order coefficients that can be used for each aspheric mirror surface in Example 6, where each aspheric surface shape can be defined by formula (1) given in the above Example 1.

[0189]

[0190]

[0191] Table 12

[0192] Fig. 22 The axial chromatic aberration curve of the optical imaging lens group of Example 6 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens group. Fig.23 An astigmatism curve of the optical imaging lens group of Example 6 is shown, which indicates meridional image curvature and sagittal image curvature. Fig.24 The distortion curve of the optical imaging lens group of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0193] according to Figure 22 to Figure 24 It can be seen that the optical imaging lens group given in Example 6 can achieve good imaging quality.

[0194] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 13.

[0195] Conditional\Example 1 2 3 4 5 6 tan(FOV / 2)*f(mm) 5.38 5.36 5.37 5.39 5.38 5.36 R12 / R14 1.13 1.46 1.22 1.18 1.16 1.23 TTL / ImgH 1.24 1.24 1.24 1.24 1.24 1.24 f6 / f7 -1.65 -1.35 -1.41 -1.27 -1.69 -1.87 |R2-R3| / T12 3.92 1.66 1.72 2.67 2.64 10.68 R11 / f 0.40 0.39 0.38 0.37 0.41 0.40 100*|CT3-CT4| 0.48 0.56 3.51 2.54 0.09 3.22 T45 / T56 0.72 1.02 0.56 1.14 0.46 0.75 T67 / TD 1.42 1.34 1.48 1.43 1.36 1.45 SAG62 / CT6 -1.12 -1.20 -1.03 -1.09 -1.17 -1.00 DT11 / ImgH 0.27 0.31 0.27 0.27 0.27 0.27 (DT61-DT52) / (DT51-DT42) 7.69 3.34 11.42 5.59 5.79 2.94 ET5 / CT5 0.91 1.06 1.04 1.09 0.92 0.85 YT61 / YT62 0.96 0.94 1.19 1.19 1.05 0.92 OT / TTL 27.79 13.89 27.78 27.78 20.83 20.84 |DISTmax|(%) 7.92 7.96 8.04 7.85 7.97 7.78

[0196] Table 13

[0197] Table 14 gives the effective focal length f of the optical imaging lens group of Examples 1 to 6, the effective focal length f1 to f7 of each lens, and the maximum field of view FOV.

[0198] Parameters_Example 1 2 3 4 5 6 TTL(mm) 7.20 7.20 7.20 7.20 7.20 7.20 ImgH(mm) 5.80 5.80 5.80 5.80 5.80 5.80 FOV(°) 83.23 83.20 83.15 83.31 83.22 83.00 Fno 1.93 1.70 1.93 1.93 1.93 1.92 f(mm) 6.06 6.04 6.06 6.06 6.06 6.06 f1(mm) 5.48 5.55 5.27 5.40 5.41 6.01 f2(mm) -15.97 -16.64 -17.16 -14.21 -14.82 200.00 f3(mm) 27.56 39.13 -166.66 29.74 24.45 39.78 f4(mm) -31.97 -39.39 -133.25 200.00 -17.75 -11.25 f5(mm) -53.41 -36.72 -36.47 -13.59 157.25 487.44 f6(mm) 10.41 10.28 8.83 8.25 10.71 11.12 f7(mm) -6.32 -7.62 -6.28 -6.52 -6.35 -5.94

[0199] Table 14

[0200] 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 group described above.

[0201] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0202] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0203] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0204] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens assembly, characterized in that: The optical imaging lens group has seven lenses with optical power, and the optical imaging lens group includes the following lenses in order from the object side to the image side along the optical axis: a first lens having positive refractive power, wherein the object-side surface of the first lens is convex, and the image-side surface of the first lens is concave; a second lens having optical power, wherein the object-side surface of the second lens is a convex surface, and the image-side surface of the second lens is a concave surface; a third lens having optical power; a fourth lens having optical power, wherein the image side surface of the fourth lens is a concave surface; a fifth lens having optical power; a sixth lens having positive refractive power, wherein the object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is concave; a seventh lens having negative optical power, wherein the object-side surface of the seventh lens is convex, and the image-side surface of the seventh lens is concave; The optical power signs of the second lens to the fifth lens are respectively negative, positive, negative, negative, or the optical power signs of the second lens to the fifth lens are respectively negative, negative, negative, negative, or the optical power signs of the second lens to the fifth lens are respectively negative, positive, positive, negative, or the optical power signs of the second lens to the fifth lens are respectively negative, positive, negative, positive, or the optical power signs of the second lens to the fifth lens are respectively negative, positive, negative, positive, or the optical power signs of the second lens to the fifth lens are respectively positive, positive, negative, positive; The maximum field of view FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group satisfy the following conditions: 5.36 mm ≤ tan (FOV / 2) * f ≤ 5.39 mm; The curvature radius R12 of the image side surface of the sixth lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: 1.13≤R12 / R14≤1.46; The curvature radius R2 of the image side surface of the first lens, the curvature radius R3 of the object side surface of the second lens, and the interval T12 between the first lens and the second lens on the optical axis satisfy: 1.66≤|R2-R3| / T12≤10.68; The curvature radius R11 of the object side surface of the sixth lens and the effective focal length f of the optical imaging lens group satisfy the following: 0.37≤R11 / f≤0.41; A distance T45 between the fourth lens and the fifth lens on the optical axis and a distance T56 between the fifth lens and the sixth lens on the optical axis satisfy the following: 0.46≤T45 / T56≤1.

14.

2. The optical imaging lens assembly according to claim 1, characterized in that: The optical imaging lens group is arranged on the electronic photosensitive element, and the distance TTL from the object side of the first lens to the imaging surface of the electronic photosensitive element on the optical axis and half of the diagonal length ImgH of the effective pixel area of ​​the electronic photosensitive element satisfy the following condition: TTL / ImgH<1.

5.

3. The optical imaging lens assembly according to claim 1, characterized in that: The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy the following: -1.87≤f6 / f7≤-1.

27.

4. The optical imaging lens assembly according to claim 1, characterized in that: A center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy the following: 0.09≤100*|CT3-CT4|≤3.

51.

5. The optical imaging lens assembly according to claim 1, characterized in that: An axial spacing distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image side surface of the sixth lens and a center thickness CT6 of the sixth lens on the optical axis satisfy: -1.2≤SAG62 / CT6≤-1.

0.

6. The optical imaging lens assembly according to claim 1, characterized in that: The effective half aperture DT11 of the object side surface of the first lens and half the diagonal length ImgH of the effective pixel area of ​​the electronic photosensitive element satisfy 0.27≤DT11 / ImgH≤0.

31.

7. The optical imaging lens assembly according to claim 1, characterized in that: The effective half-aperture DT61 of the object side surface of the sixth lens, the effective half-aperture DT52 of the image side surface of the fifth lens, the effective half-aperture DT51 of the object side surface of the fifth lens and the effective half-aperture DT42 of the image side surface of the fourth lens satisfy the following: 2.94≤(DT61-DT52) / (DT51-DT42)≤11.

42.

8. The optical imaging lens assembly according to claim 1, characterized in that: An edge thickness ET5 of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis satisfy the following: 0.85≤ET5 / CT5≤1.

09.

9. The optical imaging lens assembly according to claim 1, characterized in that: The object side surface of the sixth lens and the image side surface of the sixth lens each have at least one critical point, and the critical point sag YT61 of the object side surface of the sixth lens closest to the optical axis and the critical point sag YT62 of the image side surface of the sixth lens closest to the optical axis satisfy the following: 0.92≤YT61 / YT62≤1.

19.

10. The optical imaging lens assembly according to claim 1, characterized in that: A distance OT from the object to the object side surface of the first lens on the optical axis and a distance TTL from the object side surface of the first lens to the imaging surface of the electronic photosensitive element on the optical axis satisfy the following relationship: 13.89≤OT / TTL≤27.

79.

11. The optical imaging lens assembly according to claim 1, characterized in that: The Abbe number V3 of the third lens and the Abbe number V4 of the fourth lens satisfy: V3>V4.

12. The optical imaging lens assembly according to claim 1, characterized in that: The maximum distortion DISTmax of the optical imaging lens group satisfies: 7.78%≤|DISTmax|≤8.04%.

13. The optical imaging lens assembly according to claim 1, characterized in that: A distance T67 between the sixth lens and the seventh lens on the optical axis and a distance TD between the object-side surface of the first lens and the image-side surface of the seventh lens on the optical axis satisfy the following: 1.34≤10*T67 / TD≤1.48.

Images