Optical imaging system

Abstract

The present invention provides an optical imaging system, which sequentially includes, from the object side to the image side of the optical imaging system: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; the following conditions are satisfied between the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens: 0 < R14 / R13 < 10; the following condition is satisfied between the distance TTL on the optical axis of the optical imaging system from the object side surface of the first lens to the imaging surface of the optical imaging system and half ImgH of the diagonal length of the effective pixel region on the imaging surface: TTL / ImgH < 1.3; the following condition is satisfied between the effective focal length f7 of the seventh lens and the radius of curvature R13 of the object side surface of the seventh lens: 2.0 < f7 / R13 < 2.5; the following condition is satisfied between the dispersion coefficient V6 of the sixth lens, the dispersion coefficient V7 of the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens: 7.5 < (V6 + V7) / 2 / (f6 - f7) < 9.0. The present invention solves at least one of the problems in the prior art that the optical imaging system has a large volume, poor imaging quality, and poor matching with the chip.

Description

Technical Field

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

[0002] With the development of science and technology, users have higher and higher requirements for smart phones. In order to obtain a better hand feeling, mobile phones are developing towards being thinner and lighter. However, due to the high requirements of users for the camera function, the optical imaging systems installed on mobile phones usually use a relatively large number of lenses to obtain the characteristics of a large image plane and high image quality, which makes the volume of the optical imaging system relatively large and difficult to match with thinner and lighter mobile phones. At the same time, a relatively large number of lenses also bring more difficulties to the correction of aberration. In addition, with the development of semiconductor technology, the chip industry has developed rapidly, and it is more difficult to match the principal ray angle of the optical imaging system with the principal ray angle of the chip, resulting in difficulty in ensuring the imaging quality.

[0003] That is to say, in the prior art, the optical imaging system has at least one of the problems of relatively large volume, poor imaging quality, and poor matching with the chip. Summary of the Invention

[0004] The main object of the present invention is to provide an optical imaging system to solve at least one of the problems of relatively large volume, poor imaging quality, and poor matching with the chip in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an optical imaging system. The optical imaging system only has seven lenses, and sequentially includes from the object side to the image side of the optical imaging system: a first lens with a positive focal length; a second lens with a negative focal length; a third lens with a negative focal length; a fourth lens with a positive focal length; a fifth lens with a negative focal length; a sixth lens with a positive focal length; a seventh lens with a negative focal length, and the curvature radius of the object side surface and the curvature radius of the image side surface of the seventh lens are less than zero; the following relationships are satisfied between the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens: 0 < R14 / R13 < 10; the following relationship is satisfied between the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis and half ImgH of the diagonal length of the effective pixel area on the imaging surface: TTL / ImgH < 1.3; the following relationship is satisfied between the effective focal length f7 of the seventh lens and the curvature radius R13 of the object side surface of the seventh lens: 2.0 < f7 / R13 < 2.5; the following relationship is satisfied between the dispersion coefficient V6 of the sixth lens, the dispersion coefficient V7 of the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens: 7.5 < (V6 + V7) / 2 / (f6 - f7) < 9.0.

[0006] Furthermore, the effective focal length f of the optical imaging system and the maximum field of view angle FOV of the optical imaging system satisfy: f * tan(FOV / 2) > 4.5.

[0007] Furthermore, the effective focal length f1 of the first lens, the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, the effective focal length f2 of the second lens, the maximum effective radius DT21 of the object side surface of the second lens, and the maximum effective radius DT22 of the image side surface of the second lens satisfy: -5.0 < f1 / (DT11 + DT12) + f2 / (DT21 + DT22) < -2.0.

[0008] Furthermore, the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfies: T67 > Tij, where Tij is the air gap between the i-th lens and the j-th lens on the optical axis, i takes 1, 2, 3, 4, 5, j = i + 1, and the air gap T67 between the sixth lens and the seventh lens on the optical axis and the sum ∑AT of the air gaps between adjacent lenses of the optical imaging system on the optical axis satisfy: T67 / ∑AT < 0.5.

[0009] Furthermore, the curvature radius R11 of the object side surface of the sixth lens is less than 1.5, the curvature radius of the object side surface of the sixth lens is less than the curvature radius of the object side surface of the seventh lens, and the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R13 of the object side surface of the seventh lens satisfy: 0 < (R11 / f6) / (R13 / f7) < 1.5.

[0010] Furthermore, the curvature radius R2 of the image side surface of the first lens, the refractive index N1 of the first lens, the curvature radius R4 of the image side surface of the second lens, the refractive index N2 of the second lens, the curvature radius R6 of the image side surface of the third lens, and the refractive index N3 of the third lens satisfy: 0 < R2 / (N1 - 1) / [R4 / (N2 - 1)] + R4 / (N2 - 1) / [R6 / (N3 - 1)] < 4.0.

[0011] Furthermore, the dispersion coefficient V1 of the first lens, the central thickness CT1 of the first lens, the air gap T12 between the first lens and the second lens on the optical axis, the dispersion coefficient V2 of the second lens, the central thickness CT2 of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, the dispersion coefficient V3 of the third lens, the central thickness CT3 of the third lens, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: -5.0 < [V1 / (CT1 + T12) - V2 / (CT2 + T23) - V3 / (CT3 + T34)] / 3 < 0.

[0012] Furthermore, the axial distance SAG11 between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, the effective focal length f1 of the first lens, the axial distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens, the effective focal length f4 of the fourth lens, the axial distance SAG61 between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens, and the effective focal length f6 of the sixth lens satisfy: 2.0 < 1 / (SAG11 / f1 - SAG41 / f4 - SAG61 / f6) < 5.0.

[0013] Furthermore, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: 0 < (f3 + f4) / (f3 - f4) < 1.0.

[0014] Furthermore, the combined focal length f123 of the first lens, the second lens and the third lens, the combined focal length f45 of the fourth lens and the fifth lens, the curvature radius R1 of the object side surface of the first lens, the curvature radius R3 of the object side surface of the second lens, the curvature radius R5 of the object side surface of the third lens, the curvature radius R7 of the object side surface of the fourth lens, and the curvature radius R9 of the object side surface of the fifth lens satisfy: 0 < f123 / (R1 + R3 + R5) - f45 / (R7 + R9) < 1.0.

[0015] Furthermore, the air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the third lens and the fourth lens on the optical axis, and the air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the fifth lens and the sixth lens on the optical axis. The air gap T45 between the fourth lens and the fifth lens on the optical axis, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens satisfy: 1.5 < T45 / (ET4 + ET5) + T45 / (CT4 + CT5) < 2.5.

[0016] Furthermore, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: |f6 / f7| < 1.0, the effective focal length f6 of the sixth lens and the effective focal length f5 of the fifth lens satisfy: |f6 / f5| < 1.0, and the effective focal length f6 of the sixth lens and the effective focal length f4 of the fourth lens satisfy: |f6 / f4| < 1.0.

[0017] Furthermore, the combined focal length f67 of the sixth lens and the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: 2.0 < f67 / f6 - f67 / f7 < 3.0.

[0018] Furthermore, the maximum effective radius of the object side surface of the seventh lens is less than 5, and the following condition is satisfied between the maximum effective radius DT71 of the object side surface of the seventh lens and the maximum effective radius DT72 of the image side surface of the seventh lens: DT72 / DT71 > 1.0.

[0019] Furthermore, the central thickness CT7 of the seventh lens is less than the thickness CT7i in the extending direction of the optical axis at any position from the half of the maximum effective radius of the object side surface of the seventh lens to the center of the seventh lens.

[0020] Furthermore, the following condition is satisfied among the curvature radius R12 of the image side surface of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens, the central thickness CT6 of the sixth lens, and the air gap T56 on the optical axis between the fifth lens and the sixth lens: 0 < (R12 + R11) / CT6 - (R12 - R11) / (T56 + CT6) < 10.0.

[0021] Furthermore, the following condition is satisfied among the entrance pupil diameter EPD of the optical imaging system, the curvature radius R2 of the image side surface of the first lens, the curvature radius R1 of the object side surface of the first lens, the maximum effective radius DT11 of the object side surface of the first lens, and the maximum effective radius DT12 of the image side surface of the first lens: 1.0 < EPD / (R2 - R1) + EPD / (DT11 + DT12) < 2.0.

[0022] Furthermore, the object side surface of the first lens is convex, the image side surface of the first lens is concave, the object side surface of the second lens is convex, and the image side surface of the second lens is concave.

[0023] Furthermore, the image side surface of the third lens is concave, and the object side surface of the fourth lens is convex.

[0024] Furthermore, the object side surface of the fifth lens is convex, the image side surface of the fifth lens is concave, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave.

[0025] Furthermore, the first lens to the seventh lens are all non-cemented lenses.

[0026] According to another aspect of the present invention, an optical imaging system is provided. The optical imaging system has only seven lenses, which sequentially include, from the object side to the image side of the optical imaging system: a first lens with a positive focal length; a second lens with a negative focal length; a third lens with a negative focal length; a fourth lens with a positive focal length; a fifth lens with a negative focal length; a sixth lens with a positive focal length; and a seventh lens with a negative focal length, where the radius of curvature of the object side surface of the seventh lens and the radius of curvature of the image side surface of the seventh lens are less than zero. The distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging system and half ImgH of the diagonal length of the effective pixel region on the imaging surface satisfy: TTL / ImgH < 1.3. The Abbe number V6 of the sixth lens, the Abbe number V7 of the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: 7.5 < (V6 + V7) / 2 / (f6 - f7) < 9.0. The Abbe number V1 of the first lens, the central thickness CT1 of the first lens, the air gap T12 on the optical axis between the first lens and the second lens, the Abbe number V2 of the second lens, the central thickness CT2 of the second lens, the air gap T23 on the optical axis between the second lens and the third lens, the Abbe number V3 of the third lens, the central thickness CT3 of the third lens, and the air gap T34 on the optical axis between the third lens and the fourth lens satisfy: -5.0 < [V1 / (CT1 + T12) - V2 / (CT2 + T23) - V3 / (CT3 + T34)] / 3 < 0.

[0027] Further, the effective focal length f of the optical imaging system and the maximum field of view FOV of the optical imaging system satisfy: f * tan(FOV / 2) > 4.5.

[0028] Further, the effective focal length f1 of the first lens, the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, the effective focal length f2 of the second lens, the maximum effective radius DT21 of the object side surface of the second lens, and the maximum effective radius DT22 of the image side surface of the second lens satisfy: -5.0 < f1 / (DT11 + DT12) + f2 / (DT21 + DT22) < -2.0.

[0029] Further, the air gap T67 on the optical axis between the sixth lens and the seventh lens satisfies: T67 > Tij, where Tij is the air gap on the optical axis between the i-th lens and the j-th lens, i takes 1, 2, 3, 4, 5, and j = i + 1. The air gap T67 on the optical axis between the sixth lens and the seventh lens and the sum ∑AT of the air gaps on the optical axis of adjacent lenses of the optical imaging system satisfy: T67 / ∑AT < 0.5.

[0030] Further, the radius of curvature R11 of the object side surface of the sixth lens is less than 1.5, the radius of curvature of the object side surface of the sixth lens is less than the radius of curvature of the object side surface of the seventh lens, and the following relationship is satisfied among the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the radius of curvature R11 of the object side surface of the sixth lens, and the radius of curvature R13 of the object side surface of the seventh lens: 0 < (R11 / f6) / (R13 / f7) < 1.5.

[0031] Further, the following relationship is satisfied among the radius of curvature R2 of the image side surface of the first lens, the refractive index N1 of the first lens, the radius of curvature R4 of the image side surface of the second lens, the refractive index N2 of the second lens, the radius of curvature R6 of the image side surface of the third lens, and the refractive index N3 of the third lens: 0 < R2 / (N1 - 1) / [R4 / (N2 - 1)] + R4 / (N2 - 1) / [R6 / (N3 - 1)] < 4.0.

[0032] Further, the following relationship is satisfied among the axial distance SAG11 between the intersection point of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, the effective focal length f1 of the first lens, the axial distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens, the effective focal length f4 of the fourth lens, the axial distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens, and the effective focal length f6 of the sixth lens: 2.0 < 1 / (SAG11 / f1 - SAG41 / f4 - SAG61 / f6) < 5.0.

[0033] Further, the following relationship is satisfied between the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens: 0 < (f3 + f4) / (f3 - f4) < 1.0.

[0034] Further, the following relationship is satisfied among the combined focal length f123 of the first lens, the second lens, and the third lens, the combined focal length f45 of the fourth lens and the fifth lens, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R7 of the object side surface of the fourth lens, and the radius of curvature R9 of the object side surface of the fifth lens: 0 < f123 / (R1 + R3 + R5) - f45 / (R7 + R9) < 1.0.

[0035] Further, the air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the third lens and the fourth lens on the optical axis, and the air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the fifth lens and the sixth lens on the optical axis. The following relationship is satisfied among the air gap T45 between the fourth lens and the fifth lens on the optical axis, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens: 1.5 < T45 / (ET4 + ET5) + T45 / (CT4 + CT5) < 2.5.

[0036] Further, the following relationships are satisfied among the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens: |f6 / f7| < 1.0; among the effective focal length f6 of the sixth lens, the effective focal length f5 of the fifth lens: |f6 / f5| < 1.0; and among the effective focal length f6 of the sixth lens, the effective focal length f4 of the fourth lens: |f6 / f4| < 1.0.

[0037] Further, the following relationship is satisfied among the combined focal length f67 of the sixth lens and the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens: 2.0 < f67 / f6 - f67 / f7 < 3.0.

[0038] Further, the maximum effective radius of the object side of the seventh lens is less than 5, and the following relationship is satisfied between the maximum effective radius DT71 of the object side of the seventh lens and the maximum effective radius DT72 of the image side of the seventh lens: DT72 / DT71 > 1.0.

[0039] Further, the central thickness CT7 of the seventh lens is less than the thickness CT7i along the optical axis direction at any position from the half of the maximum effective radius of the object side of the seventh lens to the center of the seventh lens.

[0040] Further, the following relationship is satisfied among the curvature radius R12 of the image side of the sixth lens, the curvature radius R11 of the object side of the sixth lens, the central thickness CT6 of the sixth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis: 0 < (R12 + R11) / CT6 - (R12 - R11) / (T56 + CT6) < 10.0.

[0041] Further, the following relationship is satisfied among the entrance pupil diameter EPD of the optical imaging system, the curvature radius R2 of the image side of the first lens, the curvature radius R1 of the object side of the first lens, the maximum effective radius DT11 of the object side of the first lens, and the maximum effective radius DT12 of the image side of the first lens: 1.0 < EPD / (R2 - R1) + EPD / (DT11 + DT12) < 2.0.

[0042] Further, the object side surface of the first lens is convex, the image side surface of the first lens is concave, the object side surface of the second lens is convex, and the image side surface of the second lens is concave.

[0043] Further, the image side surface of the third lens is concave, and the object side surface of the fourth lens is convex.

[0044] Further, the object side surface of the fifth lens is convex, the image side surface of the fifth lens is concave, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave.

[0045] Applying the technical solution of the present invention, the optical imaging system only has seven lenses, which sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens from the object side to the image side of the optical imaging system. The focal length of the first lens is positive; the focal length of the second lens is negative; the focal length of the third lens is negative; the focal length of the fourth lens is positive; the focal length of the fifth lens is negative; the focal length of the sixth lens is positive; the focal length of the seventh lens is negative. The curvature radius of the object side surface of the seventh lens and the curvature radius of the image side surface of the seventh lens are less than zero; between the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens, it satisfies: 0 < R14 / R13 < 10; between the distance TTL on the optical axis of the object side surface of the first lens to the imaging surface of the optical imaging system and half of the diagonal length ImgH of the effective pixel area on the imaging surface, it satisfies: TTL / ImgH < 1.3; between the effective focal length f7 of the seventh lens and the curvature radius R13 of the object side surface of the seventh lens, it satisfies: 2.0 < f7 / R13 < 2.5; between the dispersion coefficient V6 of the sixth lens, the dispersion coefficient V7 of the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens, it satisfies: 7.5 < (V6 + V7) / 2 / (f6 - f7) < 9.0.

[0046] By setting the focal lengths of the first lens to the seventh lens to be positive and negative, the optical imaging system can have the characteristic of a large aperture, and it is also beneficial to correct various aberrations. By setting the curvature radii of the object side and the image side of the seventh lens to be less than zero, that is, the object side of the seventh lens is concave and the image side of the seventh lens is convex, and at the same time limiting R14 / R13 within a reasonable range, in cooperation with the negative focal length of the seventh lens, the incident angle of the principal ray when the light emerging from the seventh lens reaches the imaging surface can be controlled within a reasonable range, thereby improving the matching with the chip, ensuring the imaging quality. At the same time, by controlling f7 / R13 within a reasonable range, the shape of the seventh lens can be ensured, and the risk of ghost images generated by the seventh lens can be reduced. By controlling TTL / ImgH within a reasonable range, it is beneficial to control the total length of the optical imaging system and is conducive to reducing the volume to achieve miniaturization. By limiting (V6+V7) / 2 / (f6-f7) within a reasonable range, it can be ensured that both the sixth lens and the seventh lens are high-dispersion materials, which is beneficial to reducing the aberration of the optical imaging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0048] Figure 1 FIG. shows a schematic structural diagram of an optical imaging system according to Example 1 of the present invention;

[0049] Figures 2 to 5 respectively show Figure 1 the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging system in;

[0050] Figure 6 FIG. shows a schematic structural diagram of an optical imaging system according to Example 2 of the present invention;

[0051] Figures 7 to 10 respectively show Figure 6 the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging system in;

[0052] Figure 11 FIG. shows a schematic structural diagram of an optical imaging system according to Example 3 of the present invention;

[0053] Figures 12 to 15 respectively show Figure 11 the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging system in;

[0054] Figure 16 FIG. shows a schematic structural diagram of an optical imaging system according to Example 4 of the present invention;

[0055] Figures 17 to 20 respectively show Figure 16 the axial chromatic aberration curve, astigmatism curve, distortion curve and longitudinal chromatic aberration curve of the optical imaging system in

[0056] Figure 21 shows the structural schematic diagram of the optical imaging system of Example 5 of the present invention;

[0057] Figures 22 to 25 respectively show Figure 21 the axial chromatic aberration curve, astigmatism curve, distortion curve and longitudinal chromatic aberration curve of the optical imaging system in

[0058] Figure 26 shows the structural schematic diagram of the optical imaging system of Example 6 of the present invention;

[0059] Figures 27 to 30 respectively show Figure 26 the axial chromatic aberration curve, astigmatism curve, distortion curve and longitudinal chromatic aberration curve of the optical imaging system in

[0060] Figure 31 shows the structural schematic diagram of the optical imaging system of Example 7 of the present invention;

[0061] Figures 32 to 35 respectively show Figure 31 the axial chromatic aberration curve, astigmatism curve, distortion curve and longitudinal chromatic aberration curve of the optical imaging system in

[0062] Figure 36 shows the structural schematic diagram of the optical imaging system of Example 8 of the present invention;

[0063] Figures 37 to 40 respectively show Figure 36 the axial chromatic aberration curve, astigmatism curve, distortion curve and longitudinal chromatic aberration curve of the optical imaging system in

[0064] Among them, the above-mentioned drawings include the following reference numerals:

[0065] STO, diaphragm; E1, the first lens; S1, the object side of the first lens; S2, the image side of the first lens; E2, the second lens; S3, the object side of the second lens; S4, the image side of the second lens; E3, the third lens; S5, the object side of the third lens; S6, the image side of the third lens; E4, the fourth lens; S7, the object side of the fourth lens; S8, the image side of the fourth lens; E5, the fifth lens; S9, the object side of the fifth lens; S10, the image side of the fifth lens; E6, the sixth lens; S11, the object side of the sixth lens; S12, the image side of the sixth lens; E7, the seventh lens; S13, the object side of the seventh lens; S14, the image side of the seventh lens; E8, filter; S15, the object side of the filter; S16, the image side of the filter; S17, imaging surface. Detailed implementation mode

[0066] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments 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.

[0067] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0068] In the present invention, unless otherwise stated, the orientation words such as "upper, lower, top, bottom" are usually in reference to the direction shown in the drawings, or in reference to the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation words do not limit the present invention.

[0069] It should be noted that in this specification, the expressions such as the first, the second, the 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 teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0070] In the drawings, for the sake of convenience of explanation, the thickness, size and shape of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0071] In this text, 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 closer to the object side is the object side surface of the lens, and the surface of each lens closer 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 those with ordinary knowledge in this field, and the concavity and convexity are judged by the positive and negative values of the R value (the R value refers to the radius of curvature of the paraxial region, usually the R value on the lens database (lens data) in optical software). For the object side surface, when the R value is positive, it is judged as convex, and when the R value is negative, it is judged as concave; for the image side surface, when the R value is positive, it is judged as concave, and when the R value is negative, it is judged as convex.

[0072] In order to solve at least one of the problems in the prior art, such as the large volume of the optical imaging system, poor imaging quality, and poor matching with the chip, the present invention provides an optical imaging system.

[0073] Embodiment 1

[0074] As Figures 1 to 40 shown, the optical imaging system only has seven lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from the object side to the image side of the optical imaging system. The focal length of the first lens is positive; the focal length of the second lens is negative; the focal length of the third lens is negative; the focal length of the fourth lens is positive; the focal length of the fifth lens is negative; the focal length of the sixth lens is positive; the focal length of the seventh lens is negative. The radius of curvature of the object side surface of the seventh lens and the radius of curvature of the image side surface of the seventh lens are less than zero; between the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens, it satisfies: 0 < R14 / R13 < 10; between the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis and half of the diagonal length ImgH of the effective pixel region on the imaging surface, it satisfies: TTL / ImgH < 1.3; between the effective focal length f7 of the seventh lens and the radius of curvature R13 of the object side surface of the seventh lens, it satisfies: 2.0 < f7 / R13 < 2.5; between the dispersion coefficient V6 of the sixth lens, the dispersion coefficient V7 of the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens, it satisfies: 7.5 < (V6 + V7) / 2 / (f6 - f7) < 9.0.

[0075] By setting the focal lengths of the first lens to the seventh lens to change between positive and negative values, the optical imaging system can have the characteristic of a large aperture, and it is also beneficial to correct various aberrations. By setting the curvature radii of the object side and the image side of the seventh lens to be less than zero, that is, the object side of the seventh lens is concave and the image side of the seventh lens is convex, and at the same time restricting R14 / R13 within a reasonable range and cooperating with the negative focal length of the seventh lens, the incident angle of the principal ray when the light emerging from the seventh lens reaches the imaging surface can be controlled within a reasonable range, thereby improving the matching with the chip, ensuring the imaging quality. At the same time, by controlling f7 / R13 within a reasonable range, the shape of the seventh lens can be ensured, and the risk of ghost images generated by the seventh lens can be reduced.

[0076] By controlling TTL / ImgH within a reasonable range, it is beneficial to control the total length of the optical imaging system and is conducive to reducing the volume to achieve miniaturization. By restricting (V6 + V7) / 2 / (f6 - f7) within a reasonable range, it can be ensured that both the sixth lens and the seventh lens are high-dispersion materials, which is beneficial to reducing the aberrations of the optical imaging system.

[0077] Preferably, the curvature radius R13 of the object side of the seventh lens and the curvature radius R14 of the image side of the seventh lens satisfy: 6.69 ≤ R14 / R13 ≤ 10.

[0078] Preferably, the distance TTL from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: 1.10 ≤ TTL / ImgH ≤ 1.18.

[0079] Preferably, the effective focal length f7 of the seventh lens and the curvature radius R13 of the object side of the seventh lens satisfy: 2.10 ≤ f7 / R13 ≤ 2.19;

[0080] Preferably, the dispersion coefficient V6 of the sixth lens, the dispersion coefficient V7 of the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: 7.94 ≤ (V6 + V7) / 2 / (f6 - f7) ≤ 8.56.

[0081] In this embodiment, the effective focal length f of the optical imaging system and the maximum field of view FOV of the optical imaging system satisfy: f * tan(FOV / 2) > 4.5. By restricting f * tan(FOV / 2) within a reasonable range, the shooting range of the optical imaging system can be ensured, enabling the system to have a larger image surface and enhancing the sense of the picture of the system. Preferably, 4.66 ≤ f * tan(FOV / 2) ≤ 5.29.

[0082] In this embodiment, the following relationships are satisfied among the effective focal length f1 of the first lens, the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, the effective focal length f2 of the second lens, the maximum effective radius DT21 of the object side surface of the second lens, and the maximum effective radius DT22 of the image side surface of the second lens: -5.0 < f1 / (DT11 + DT12) + f2 / (DT21 + DT22) < -2.0. By restricting f1 / (DT11 + DT12) + f2 / (DT21 + DT22) within a reasonable range, the effective focal lengths of the first lens and the second lens can be reasonably allocated, the aberration of the system can be reduced, and the imaging quality of the system can be improved. Preferably, -4.41 ≤ f1 / (DT11 + DT12) + f2 / (DT21 + DT22) ≤ -2.69.

[0083] In this embodiment, the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfies: T67 > Tij, where Tij is the air gap between the i-th lens and the j-th lens on the optical axis, i takes 1, 2, 3, 4, 5, and j = i + 1. The air gap T67 between the sixth lens and the seventh lens on the optical axis and the sum ∑AT of the air gaps between adjacent lenses of two optical imaging systems on the optical axis satisfy: T67 / ∑AT < 0.5. By setting the air gap between the sixth lens and the seventh lens on the optical axis to be the largest, it can ensure that the large-aperture sixth lens and seventh lens have a sufficiently large assembly space and reduce the assembly difficulty. At the same time, with T67 / ∑AT within a reasonable range, the intervals of the lenses on the optical axis can be reasonably allocated, which can avoid excessive light deflection and reduce the processing difficulty of the optical imaging lens. Preferably, 0.39 ≤ T67 / ∑AT ≤ 0.41.

[0084] In this embodiment, the curvature radius R11 of the object side surface of the sixth lens is less than 1.5, the curvature radius of the object side surface of the sixth lens is less than the curvature radius of the object side surface of the seventh lens. The following relationship is satisfied among the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R13 of the object side surface of the seventh lens: 0 < (R11 / f6) / (R13 / f7) < 1.5. By restricting (R11 / f6) / (R13 / f7) within a reasonable range, the bending degrees of the object side surfaces of the sixth lens and the seventh lens can be controlled. At the same time, in combination with the effective focal lengths of the sixth lens and the seventh lens, the surface shapes of the sixth lens and the seventh lens are more reasonable, and the sixth lens and the seventh lens have better molding and processing characteristics. Preferably, 1.02 ≤ (R11 / f6) / (R13 / f7) ≤ 1.07.

[0085] In this embodiment, the following relationship is satisfied among the radius of curvature R2 of the image side surface of the first lens, the refractive index N1 of the first lens, the radius of curvature R4 of the image side surface of the second lens, the refractive index N2 of the second lens, the radius of curvature R6 of the image side surface of the third lens, and the refractive index N3 of the third lens: 0 < R2 / (N1 - 1) / [R4 / (N2 - 1)] + R4 / (N2 - 1) / [R6 / (N3 - 1)] < 4.0. By restricting R2 / (N1 - 1) / [R4 / (N2 - 1)] + R4 / (N2 - 1) / [R6 / (N3 - 1)] within a reasonable range, it can be ensured that the first lens is made of a low-refractive-index material, and the second and third lenses are made of high-refractive-index materials, which can reduce the distortion of the optical imaging system, reduce aberration, and thus improve the image quality. Preferably, 1.89 ≤ R2 / (N1 - 1) / [R4 / (N2 - 1)] + R4 / (N2 - 1) / [R6 / (N3 - 1)] ≤ 2.81.

[0086] In this embodiment, the following relationship is satisfied among the Abbe number V1 of the first lens, the central thickness CT1 of the first lens, the air gap T12 between the first lens and the second lens on the optical axis, the Abbe number V2 of the second lens, the central thickness CT2 of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, the Abbe number V3 of the third lens, the central thickness CT3 of the third lens, and the air gap T34 between the third lens and the fourth lens on the optical axis: -5.0 < [V1 / (CT1 + T12) - V2 / (CT2 + T23) - V3 / (CT3 + T34)] / 3 < 0. By restricting [V1 / (CT1 + T12) - V2 / (CT2 + T23) - V3 / (CT3 + T34)] / 3 within a reasonable range, it can be ensured that the first lens is made of a high-dispersion material, and the second and third lenses are made of low-dispersion materials, which can reduce the distortion of the optical imaging system, reduce aberration, and thus improve the image quality. Preferably, -4.04 ≤ [V1 / (CT1 + T12) - V2 / (CT2 + T23) - V3 / (CT3 + T34)] / 3 ≤ -2.22.

[0087] In this embodiment, the following relationships are satisfied among the axial distance SAG11 between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, the effective focal length f1 of the first lens, the axial distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens, the effective focal length f4 of the fourth lens, the axial distance SAG61 between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens, and the effective focal length f6 of the sixth lens: 2.0 < 1 / (SAG11 / f1 - SAG41 / f4 - SAG61 / f6) < 5.0. By restricting 1 / (SAG11 / f1 - SAG41 / f4 - SAG61 / f6) within a reasonable range, the distortion contribution amounts of the first lens, the fourth lens, and the sixth lens can be controlled within a reasonable range, such that the distortion variation amounts of each field of view of the optical imaging system are within a reasonable range, which is beneficial to meeting the requirements of subsequent software debugging and ensuring the imaging quality. Preferably, 3.80 ≤ 1 / (SAG11 / f1 - SAG41 / f4 - SAG61 / f6) ≤ 4.52.

[0088] In this embodiment, the following relationship is satisfied between the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens: 0 < (f3 + f4) / (f3 - f4) < 1.0. By restricting (f3 + f4) / (f3 - f4) within a reasonable range, it is beneficial to better balance the aberrations at the third lens and the fourth lens and improve the imaging quality. Preferably, 0.22 ≤ (f3 + f4) / (f3 - f4) ≤ 0.76.

[0089] In this embodiment, the following relationship is satisfied among the combined focal length f123 of the first lens, the second lens, and the third lens, the combined focal length f45 of the fourth lens and the fifth lens, the curvature radius R1 of the object side surface of the first lens, the curvature radius R3 of the object side surface of the second lens, the curvature radius R5 of the object side surface of the third lens, the curvature radius R7 of the object side surface of the fourth lens, and the curvature radius R9 of the object side surface of the fifth lens: 0 < f123 / (R1 + R3 + R5) - f45 / (R7 + R9) < 1.0. By restricting f123 / (R1 + R3 + R5) - f45 / (R7 + R9) within a reasonable range, the effective focal lengths of the first lens to the fifth lens can be reasonably allocated, the aberrations of the optical imaging system can be reduced, and the imaging quality can be improved. At the same time, it is also beneficial to improve the surface type rationality of the first lens to the fifth lens and facilitate the processing and shaping of the first lens to the fifth lens. Preferably, 0.25 ≤ f123 / (R1 + R3 + R5) - f45 / (R7 + R9) ≤ 0.53.

[0090] In this embodiment, the air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the third lens and the fourth lens on the optical axis. The air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the fifth lens and the sixth lens on the optical axis. The following relationship is satisfied among the air gap T45 between the fourth lens and the fifth lens on the optical axis, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens: 1.5 < T45 / (ET4 + ET5) + T45 / (CT4 + CT5) < 2.5. Setting the air gap between the fourth lens and the fifth lens on the optical axis to be greater than the air gaps between the third lens and the fourth lens and between the fifth lens and the sixth lens on the optical axis can ensure that the fourth lens and the fifth lens have more reasonable positions on the optical axis. By restricting T45 / (ET4 + ET5) + T45 / (CT4 + CT5) within a reasonable range, on the premise of ensuring the miniaturization of the optical imaging system, the processing and forming of the third lens, the fourth lens, and the fifth lens can be ensured, and the performance loss caused by poor surface shape can be reduced. Preferably, 1.78 ≤ T45 / (ET4 + ET5) + T45 / (CT4 + CT5) ≤ 2.02.

[0091] In this embodiment, the following relationships are satisfied among the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens: |f6 / f7| < 1.0. The following relationship is satisfied between the effective focal length f6 of the sixth lens and the effective focal length f5 of the fifth lens: |f6 / f5| < 1.0. The following relationship is satisfied between the effective focal length f6 of the sixth lens and the effective focal length f4 of the fourth lens: |f6 / f4| < 1.0. By controlling the proportional relationships between the effective focal length of the sixth lens and the effective focal lengths of the seventh lens, the fifth lens, and the fourth lens, the effective focal lengths of the fourth lens, the fifth lens, the sixth lens, and the seventh lens can be reasonably allocated, the distortion of the outer field of view can be reduced, and thus the distortion of the optical imaging system can be controlled and the imaging quality can be improved. Preferably, 0.69 ≤ |f6 / f7| ≤ 0.73, 0.56 ≤ |f6 / f5| ≤ 0.60, 0.07 ≤ |f6 / f4| ≤ 0.11.

[0092] In this embodiment, the following relationship is satisfied among the combined focal length f67 of the sixth lens and the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens: 2.0 < f67 / f6 - f67 / f7 < 3.0. By restricting f67 / f6 - f67 / f7 within a reasonable range, the effective focal lengths of the sixth lens and the seventh lens can be reasonably allocated, and then the CRA (the incident angle of the chief ray on the imaging surface) under the condition of half of the maximum field of view angle of the optical imaging system can be controlled, the matching between the CRA and the chip can be ensured, the chip response problem caused by the mismatch of the CRA can be reduced, and the imaging quality can be ensured. Preferably, 2.75 ≤ f67 / f6 - f67 / f7 ≤ 2.95.

[0093] In this embodiment, the maximum effective radius of the object side surface of the seventh lens is less than 5, and the following relationship is satisfied between the maximum effective radius DT71 of the object side surface of the seventh lens and the maximum effective radius DT72 of the image side surface of the seventh lens: DT72 / DT71 > 1.0. By controlling DT72 / DT71 within a reasonable range, the processing and forming of the large-aperture seventh lens can be ensured, which is also helpful to reduce the sagittal astigmatism of the system and improve the imaging quality. Preferably, 1.04 ≤ DT72 / DT71 ≤ 1.11.

[0094] In this embodiment, the central thickness CT7 of the seventh lens is less than the thickness CT7i in the extending direction of the optical axis at any position from the half of the maximum effective radius of the object side surface of the seventh lens to the center of the seventh lens. Such a setting can ensure the processing and forming of the seventh lens and reduce the performance loss caused by poor surface shape.

[0095] It should be noted that the center of the seventh lens in this application refers to the part of the half of the maximum effective radius of the seventh lens close to the optical axis. That is to say, CT7i is the thickness in the extending direction of the optical axis at any position of the part of the half of the maximum effective radius of the seventh lens close to the optical axis. Or it is the thickness in the extending direction of the optical axis at any position in the area excluding the center point of the seventh lens within the range of a circle with the center point of the object side surface of the seventh lens as the center and half of the maximum effective radius as the radius.

[0096] In this embodiment, the following relationship is satisfied among the curvature radius R12 of the image side surface of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens, the central thickness CT6 of the sixth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis: 0 < (R12 + R11) / CT6 - (R12 - R11) / (T56 + CT6) < 10.0. By restricting (R12 + R11) / CT6 - (R12 - R11) / (T56 + CT6) within a reasonable range, the processing and forming of the sixth lens can be ensured, and the performance loss caused by poor surface shape can be reduced. Preferably, 8.41 ≤ (R12 + R11) / CT6 - (R12 - R11) / (T56 + CT6) ≤ 9.99.

[0097] In this embodiment, the following conditions are satisfied among the entrance pupil diameter EPD of the optical imaging system, the curvature radius R2 of the image side of the first lens, the curvature radius R1 of the object side of the first lens, the maximum effective radius DT11 of the object side of the first lens, and the maximum effective radius DT12 of the image side of the first lens: 1.0 < EPD / (R2 - R1) + EPD / (DT11 + DT12) < 2.0. By restricting EPD / (R2 - R1) + EPD / (DT11 + DT12) within a reasonable range, the light input of the system can be ensured, and a better photographing effect can be achieved in a relatively dark environment. At the same time, the shape of the first lens can be controlled, the sensitivity of the system can be reduced, and the yield of the system can be improved. Preferably, 1.41 ≤ EPD / (R2 - R1) + EPD / (DT11 + DT12) ≤ 1.65.

[0098] In this embodiment, the object side of the first lens is convex, the image side of the first lens is concave, the object side of the second lens is convex, and the image side of the second lens is concave. Such a setting can reduce the spherical aberration contribution of the first lens and the second lens to the entire system, thereby improving the imaging quality.

[0099] In this embodiment, the image side of the third lens is concave, and the object side of the fourth lens is convex. Such a setting can weaken the ghost images brought by the third lens and the fourth lens, reduce the noise in the photographed image, and make the imaging image clearer.

[0100] In this embodiment, the object side of the fifth lens is convex, the image side of the fifth lens is concave, the object side of the sixth lens is convex, and the image side of the sixth lens is concave. Such a setting can control the surface shapes of the fifth lens and the sixth lens, reduce the off-axis aberration of the system, and thus improve the image quality of the system.

[0101] In this embodiment, the first lens to the seventh lens are all non-cemented lenses. Using non-cemented lenses can facilitate the maintenance of the optical imaging system.

[0102] Embodiment Two

[0103] As Figures 1 to 40As shown, the optical imaging system only has seven lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from the object side to the image side of the optical imaging system. The focal length of the first lens is positive; the focal length of the second lens is negative; the focal length of the third lens is negative; the focal length of the fourth lens is positive; the focal length of the fifth lens is negative; the focal length of the sixth lens is positive; the focal length of the seventh lens is negative. The radius of curvature of the object side surface of the seventh lens and the radius of curvature of the image side surface of the seventh lens are less than zero. The distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging system and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL / ImgH < 1.3. The Abbe number V6 of the sixth lens, the Abbe number V7 of the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: 7.5 < (V6 + V7) / 2 / (f6 - f7) < 9.0. The Abbe number V1 of the first lens, the central thickness CT1 of the first lens, the air gap T12 between the first lens and the second lens on the optical axis, the Abbe number V2 of the second lens, the central thickness CT2 of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, the Abbe number V3 of the third lens, the central thickness CT3 of the third lens, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: -5.0 < [V1 / (CT1 + T12) - V2 / (CT2 + T23) - V3 / (CT3 + T34)] / 3 < 0.

[0104] By setting the focal lengths of the first lens to the seventh lens to change between positive and negative, the optical imaging system can have the characteristic of a large aperture and is also beneficial to correcting various aberrations. By setting the radii of curvature of both the object side surface and the image side surface of the seventh lens to be less than zero, that is, the object side surface of the seventh lens is concave and the image side surface of the seventh lens is convex, and combined with the negative focal length of the seventh lens, the incident angle of the chief ray when the light rays emerging from the seventh lens reach the imaging surface can be controlled within a reasonable range, thereby improving the matching with the chip and ensuring the imaging quality.

[0105] By controlling TTL / ImgH within a reasonable range, it is beneficial to control the total length of the optical imaging system and is conducive to reducing the volume to achieve miniaturization. By restricting (V6 + V7) / 2 / (f6 - f7) within a reasonable range, it can be ensured that both the sixth lens and the seventh lens are high-dispersion materials, which is beneficial to reducing the aberrations of the optical imaging system. By restricting [V1 / (CT1 + T12) - V2 / (CT2 + T23) - V3 / (CT3 + T34)] / 3 within a reasonable range, it can be ensured that the first lens is a high-dispersion material, and the second lens and the third lens are low-dispersion materials, which can reduce the distortion of the optical imaging system, reduce aberrations, and thus improve the image quality.

[0106] Preferably, the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis of the optical imaging system and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: 1.10 ≤ TTL / ImgH ≤ 1.18.

[0107] Preferably, the dispersion coefficient V6 of the sixth lens, the dispersion coefficient V7 of the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: 7.94 ≤ (V6 + V7) / 2 / (f6 - f7) ≤ 8.56.

[0108] Preferably, the dispersion coefficient V1 of the first lens, the central thickness CT1 of the first lens, the air gap T12 between the first lens and the second lens on the optical axis, the dispersion coefficient V2 of the second lens, the central thickness CT2 of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, the dispersion coefficient V3 of the third lens, the central thickness CT3 of the third lens, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: -4.04 ≤ [V1 / (CT1 + T12) - V2 / (CT2 + T23) - V3 / (CT3 + T34)] / 3 ≤ -2.22.

[0109] In this embodiment, the effective focal length f of the optical imaging system and the maximum field of view FOV of the optical imaging system satisfy: f * tan(FOV / 2) > 4.5. By limiting f * tan(FOV / 2) within a reasonable range, the shooting range of the optical imaging system can be guaranteed, enabling the system to have a larger image surface and enhancing the sense of the image of the system. Preferably, 4.66 ≤ f * tan(FOV / 2) ≤ 5.29.

[0110] In this embodiment, the effective focal length f1 of the first lens, the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, the effective focal length f2 of the second lens, the maximum effective radius DT21 of the object side surface of the second lens, and the maximum effective radius DT22 of the image side surface of the second lens satisfy: -5.0 < f1 / (DT11 + DT12) + f2 / (DT21 + DT22) < -2.0. By limiting f1 / (DT11 + DT12) + f2 / (DT21 + DT22) within a reasonable range, the effective focal lengths of the first lens and the second lens can be reasonably allocated, reducing the aberration of the system and improving the imaging quality of the system. Preferably, -4.41 ≤ f1 / (DT11 + DT12) + f2 / (DT21 + DT22) ≤ -2.69.

[0111] In this embodiment, the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfies: T67 > Tij, where Tij is the air gap between the i-th lens and the j-th lens on the optical axis, i takes 1, 2, 3, 4, 5, and j = i + 1. The air gap T67 between the sixth lens and the seventh lens on the optical axis and the sum ∑AT of the air gaps between adjacent lenses of two optical imaging systems on the optical axis satisfy: T67 / ∑AT < 0.5. Controlling the air gap between the sixth lens and the seventh lens on the optical axis to be the largest can ensure that the large-diameter sixth lens and seventh lens have a sufficiently large assembly space and reduce the assembly difficulty. At the same time, with T67 / ∑AT within a reasonable range, the intervals of the lenses on the optical axis can be reasonably distributed, which can avoid excessive light deflection and reduce the processing difficulty of the optical imaging lens. Preferably, 0.39 ≤ T67 / ∑AT ≤ 0.41.

[0112] In this embodiment, the curvature radius R11 of the object side surface of the sixth lens is less than 1.5, the curvature radius of the object side surface of the sixth lens is less than that of the object side surface of the seventh lens, and the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R13 of the object side surface of the seventh lens satisfy: 0 < (R11 / f6) / (R13 / f7) < 1.5. By limiting (R11 / f6) / (R13 / f7) within a reasonable range, the bending degrees of the object side surfaces of the sixth lens and the seventh lens can be controlled. At the same time, in combination with the effective focal lengths of the sixth lens and the seventh lens, the surface shapes of the sixth lens and the seventh lens are more reasonable, and the sixth lens and the seventh lens have better molding and processing characteristics. Preferably, 1.02 ≤ (R11 / f6) / (R13 / f7) ≤ 1.07.

[0113] In this embodiment, the curvature radius R2 of the image side surface of the first lens, the refractive index N1 of the first lens, the curvature radius R4 of the image side surface of the second lens, the refractive index N2 of the second lens, the curvature radius R6 of the image side surface of the third lens, and the refractive index N3 of the third lens satisfy: 0 < R2 / (N1 - 1) / [R4 / (N2 - 1)] + R4 / (N2 - 1) / [R6 / (N3 - 1)] < 4.0. By limiting R2 / (N1 - 1) / [R4 / (N2 - 1)] + R4 / (N2 - 1) / [R6 / (N3 - 1)] within a reasonable range, it can be ensured that the first lens is a low-refractive-index material, and the second lens and the third lens are high-refractive-index materials, which can reduce the distortion of the optical imaging system, reduce the aberration, and thus improve the image quality. Preferably, 1.89 ≤ R2 / (N1 - 1) / [R4 / (N2 - 1)] + R4 / (N2 - 1) / [R6 / (N3 - 1)] ≤ 2.81.

[0114] In this embodiment, the following relationships are satisfied among the axial distance SAG11 between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, the effective focal length f1 of the first lens, the axial distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens, the effective focal length f4 of the fourth lens, the axial distance SAG61 between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens, and the effective focal length f6 of the sixth lens: 2.0 < 1 / (SAG11 / f1 - SAG41 / f4 - SAG61 / f6) < 5.0. By limiting 1 / (SAG11 / f1 - SAG41 / f4 - SAG61 / f6) within a reasonable range, the distortion contribution amounts of the first lens, the fourth lens, and the sixth lens can be controlled within a reasonable range, such that the distortion variation amounts of each field of view of the optical imaging system are within a reasonable range, which is conducive to meeting the requirements of subsequent software debugging and ensuring the imaging quality. Preferably, 3.80 ≤ 1 / (SAG11 / f1 - SAG41 / f4 - SAG61 / f6) ≤ 4.52.

[0115] In this embodiment, the following relationship is satisfied between the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens: 0 < (f3 + f4) / (f3 - f4) < 1.0. By limiting (f3 + f4) / (f3 - f4) within a reasonable range, it is beneficial to better balance the aberration at the third lens and the fourth lens, which is conducive to improving the imaging quality. Preferably, 0.22 ≤ (f3 + f4) / (f3 - f4) ≤ 0.76.

[0116] In this embodiment, the following relationship is satisfied among the combined focal length f123 of the first lens, the second lens, and the third lens, the combined focal length f45 of the fourth lens and the fifth lens, the curvature radius R1 of the object side surface of the first lens, the curvature radius R3 of the object side surface of the second lens, the curvature radius R5 of the object side surface of the third lens, the curvature radius R7 of the object side surface of the fourth lens, and the curvature radius R9 of the object side surface of the fifth lens: 0 < f123 / (R1 + R3 + R5) - f45 / (R7 + R9) < 1.0. By limiting f123 / (R1 + R3 + R5) - f45 / (R7 + R9) within a reasonable range, the effective focal lengths of the first lens to the fifth lens can be reasonably allocated, the aberration of the optical imaging system can be reduced, and the imaging quality can be improved. At the same time, it is also beneficial to improve the surface type rationality of the first lens to the fifth lens, which is conducive to the processing and forming of the first lens to the fifth lens. Preferably, 0.25 ≤ f123 / (R1 + R3 + R5) - f45 / (R7 + R9) ≤ 0.53.

[0117] In this embodiment, the air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the third lens and the fourth lens on the optical axis, and the air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the fifth lens and the sixth lens on the optical axis. The following relationship is satisfied among the air gap T45 between the fourth lens and the fifth lens on the optical axis, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens: 1.5 < T45 / (ET4 + ET5) + T45 / (CT4 + CT5) < 2.5. Setting the air gap between the fourth lens and the fifth lens on the optical axis to be greater than the air gaps between the third lens and the fourth lens, and between the fifth lens and the sixth lens on the optical axis can ensure that the fourth lens and the fifth lens have a more reasonable position on the optical axis. By restricting T45 / (ET4 + ET5) + T45 / (CT4 + CT5) within a reasonable range, on the premise of ensuring the miniaturization of the optical imaging system, it can ensure the processing and shaping of the third lens, the fourth lens, and the fifth lens, and reduce the performance loss caused by poor surface shape. Preferably, 1.78 ≤ T45 / (ET4 + ET5) + T45 / (CT4 + CT5) ≤ 2.02.

[0118] In this embodiment, the following relationships are satisfied among the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens: |f6 / f7| < 1.0; among the effective focal length f6 of the sixth lens and the effective focal length f5 of the fifth lens: |f6 / f5| < 1.0; and among the effective focal length f6 of the sixth lens and the effective focal length f4 of the fourth lens: |f6 / f4| < 1.0. By controlling the proportional relationships of the effective focal length of the sixth lens with those of the seventh lens, the fifth lens, and the fourth lens, the effective focal lengths of the fourth lens, the fifth lens, the sixth lens, and the seventh lens can be reasonably allocated, the distortion of the outer field of view can be reduced, and further the distortion of the optical imaging system can be controlled to improve the imaging quality. Preferably, 0.69 ≤ |f6 / f7| ≤ 0.73, 0.56 ≤ |f6 / f5| ≤ 0.60, 0.07 ≤ |f6 / f4| ≤ 0.11.

[0119] In this embodiment, the following relationship is satisfied among the combined focal length f67 of the sixth lens and the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens: 2.0 < f67 / f6 - f67 / f7 < 3.0. By restricting f67 / f6 - f67 / f7 within a reasonable range, the effective focal lengths of the sixth lens and the seventh lens can be reasonably allocated, and further the CRA (the incident angle of the chief ray on the imaging surface) under the condition of half of the maximum field of view angle of the optical imaging system can be controlled, ensuring the matching of the CRA with the chip, reducing the chip response problem caused by the mismatch of the CRA, and ensuring the imaging quality. Preferably, 2.75 ≤ f67 / f6 - f67 / f7 ≤ 2.95.

[0120] In this embodiment, the maximum effective radius of the object side surface of the seventh lens is less than 5, and the following relationship is satisfied between the maximum effective radius DT71 of the object side surface of the seventh lens and the maximum effective radius DT72 of the image side surface of the seventh lens: DT72 / DT71 > 1.0. By controlling DT72 / DT71 within a reasonable range, the processing and forming of the large-aperture seventh lens can be ensured, which is also helpful for reducing the sagittal astigmatism of the system and improving the imaging quality. Preferably, 1.04 ≤ DT72 / DT71 ≤ 1.11.

[0121] In this embodiment, the central thickness CT7 of the seventh lens is less than the thickness CT7i along the optical axis direction at any position from the half of the maximum effective radius of the object side surface of the seventh lens to the center of the seventh lens. Such a setting can ensure the processing and forming of the seventh lens and reduce the performance loss caused by poor surface shape.

[0122] It should be noted that the center of the seventh lens in this application refers to the part of the seventh lens where half of the maximum effective radius is close to the optical axis. That is to say, CT7i is the thickness along the optical axis direction at any position of the part where half of the maximum effective radius of the seventh lens is close to the optical axis.

[0123] In this embodiment, the following relationship is satisfied among the curvature radius R12 of the image side surface of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens, the central thickness CT6 of the sixth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis: 0 < (R12 + R11) / CT6 - (R12 - R11) / (T56 + CT6) < 10.0. By restricting (R12 + R11) / CT6 - (R12 - R11) / (T56 + CT6) within a reasonable range, the processing and forming of the sixth lens can be ensured, and the performance loss caused by poor surface shape can be reduced. Preferably, 8.41 ≤ (R12 + R11) / CT6 - (R12 - R11) / (T56 + CT6) ≤ 9.99.

[0124] In this embodiment, the following relationship is satisfied among the entrance pupil diameter EPD of the optical imaging system, the curvature radius R2 of the image side surface of the first lens, the curvature radius R1 of the object side surface of the first lens, the maximum effective radius DT11 of the object side surface of the first lens, and the maximum effective radius DT12 of the image side surface of the first lens: 1.0 < EPD / (R2 - R1) + EPD / (DT11 + DT12) < 2.0. By restricting EPD / (R2 - R1) + EPD / (DT11 + DT12) within a reasonable range, the light input of the system can be ensured, and a better photographing effect can be obtained in a darker environment. At the same time, the shape of the first lens can be controlled, the sensitivity of the system can be reduced, and the yield of the system can be improved. Preferably, 1.41 ≤ EPD / (R2 - R1) + EPD / (DT11 + DT12) ≤ 1.65.

[0125] In this embodiment, the object side of the first lens is convex, the image side of the first lens is concave, the object side of the second lens is convex, and the image side of the second lens is concave. Such a setting can reduce the contribution of spherical aberration of the first lens and the second lens to the entire system, thereby improving the imaging quality.

[0126] In this embodiment, the image side of the third lens is concave, and the object side of the fourth lens is convex. Such a setting can weaken the ghost images brought by the third lens and the fourth lens, reduce the noise in the photographed image, and make the imaging image clearer.

[0127] In this embodiment, the object side of the fifth lens is convex, the image side of the fifth lens is concave, the object side of the sixth lens is convex, and the image side of the sixth lens is concave. Such a setting can control the surface shape of the fifth lens and the sixth lens, reduce the off-axis aberration of the system, and thus improve the image quality of the system.

[0128] In this embodiment, the first lens to the seventh lens are all non-cemented lenses. Using non-cemented lenses can facilitate the maintenance of the optical imaging system.

[0129] Optionally, the above optical imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0130] The optical imaging system in this application can use multiple lenses, such as the seven lenses mentioned above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the on-axis distance between each lens, etc., the aperture of the optical imaging system can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the optical imaging system more conducive to production and processing and applicable to portable electronic devices such as smart phones. The above optical imaging system also has the advantages of large aperture, large field of view, and good imaging quality, and can meet the requirements of miniaturization of smart electronic products.

[0131] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0132] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification. For example, although seven lenses are described as an example in the embodiments, the optical imaging system is not limited to including seven lenses. If necessary, the optical imaging system may also include other numbers of lenses.

[0133] The following further describes, with reference to the accompanying drawings, examples of the specific surface types and parameters of the optical imaging system applicable to the above embodiments.

[0134] It should be noted that any one of Examples 1 to 8 below is applicable to all embodiments of this application.

[0135] Example 1

[0136] As Figures 1 to 5 shown, the optical imaging system of Example 1 of this application is described. Figure 1 The structural schematic diagram of the optical imaging system of Example 1 is shown.

[0137] As Figure 1 shown, the optical imaging system sequentially includes, from the object side to the image side, a stop 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.

[0138] The first lens E1 has a positive optical power. The object surface S1 of the first lens is convex, and the image surface S2 of the first lens is concave. The second lens E2 has a negative optical power. The object surface S3 of the second lens is convex, and the image surface S4 of the second lens is concave. The third lens E3 has a negative optical power. The object surface S5 of the third lens is convex, and the image surface S6 of the third lens is concave. The fourth lens E4 has a positive optical power. The object surface S7 of the fourth lens is convex, and the image surface S8 of the fourth lens is concave. The fifth lens E5 has a negative optical power. The object surface S9 of the fifth lens is convex, and the image surface S10 of the fifth lens is concave. The sixth lens E6 has a positive optical power. The object surface S11 of the sixth lens is convex, and the image surface S12 of the sixth lens is concave. The seventh lens E7 has a negative optical power. The object surface S13 of the seventh lens is concave, and the image surface S14 of the seventh lens is convex. The filter E8 has an object surface S15 of the filter and an image surface S16 of the filter. The light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0139] In this example, the total effective focal length f of the optical imaging system is 5.34 mm, the maximum field of view angle FOV of the optical imaging system is 88.0°, the total length TTL of the optical imaging system is 6.20 mm, half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH is 5.27 mm, and the aperture number f / EPD of the optical imaging system is 1.88.

[0140] Table 1 shows the basic structural parameter table of the optical imaging system in Example 1, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0141]

[0142] Table 1

[0143] In Example 1, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are both aspherical surfaces, and the surface profiles of the aspherical lenses can be defined by, but not limited to, the following aspherical formula:

[0144]

[0145] Among them, x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface extends along the optical axis at a position with a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for the aspherical mirrors S1 - S14 in Example 1.

[0146]

[0147]

[0148] Table 2

[0149] Figure 2 Shows the axial chromatic aberration curve of the optical imaging system in Example 1, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the optical imaging system. Figure 3 Shows the astigmatism curve of the optical imaging system in Example 1, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4 Shows the distortion curve of the optical imaging system in Example 1, which represents the distortion magnitude values corresponding to different field of view angles. Figure 5 Shows the lateral chromatic aberration curve of the optical imaging system in Example 1, which represents the deviation of different image heights on the imaging surface after the light rays pass through the optical imaging system.

[0150] According toFigures 2 to 5 It can be seen that the optical imaging system given in Example 1 can achieve good imaging quality.

[0151] Example 2

[0152] As Figures 6 to 10 shown, the optical imaging system of Example 2 of this application is described. Figure 1 The structural schematic diagram of the optical imaging system of Example 2 is shown. For the sake of brevity, some descriptions similar to those of Example 1 will be omitted.

[0153] As Figure 6 shown, the optical imaging system sequentially includes a stop 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 from the object side to the image side.

[0154] The first lens E1 has a positive optical 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 a negative optical 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 a negative optical 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 a positive optical 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 a negative optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has a positive optical 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 a negative optical power. The object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The filter E8 has an object side surface S15 of the filter and an image side surface S16 of the filter. The light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0155] In this example, the total effective focal length f of the optical imaging system is 5.58 mm, the maximum field of view angle FOV of the optical imaging system is 86.8°, the total length TTL of the optical imaging system is 6.50 mm, half of the diagonal length of the effective pixel region on the imaging surface of the optical imaging system ImgH is 5.53 mm, and the f-number f / EPD of the optical imaging system is 1.86.

[0156] Table 3 shows the basic structural parameter table of the optical imaging system of Example 2, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0157]

[0158] Table 3

[0159] Table 4 gives the coefficients of the higher-order terms that can be used for each aspherical mirror S1 - S14 in Example 2, and the surface profiles of the aspherical surfaces can be defined by formula (1) given in Example 1.

[0160]

[0161]

[0162] Table 4

[0163] Figure 7 shows the axial chromatic aberration curve of the optical imaging system of Example 2, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical imaging system. Figure 8 shows the astigmatism curve of the optical imaging system of Example 2, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 9 shows the distortion curve of the optical imaging system of Example 2, which represents the distortion magnitude values corresponding to different field angles. Figure 10 shows the lateral chromatic aberration curve of the optical imaging system of Example 2, which represents the deviation of different image heights on the imaging plane after light rays pass through the optical imaging system.

[0164] According to Figures 7 to 10 it can be known that the optical imaging system given in Example 2 can achieve good imaging quality.

[0165] Example 3

[0166] As Figures 11 to 15 shown, the optical imaging system of Example 3 of the present application is described. Figure 11 shows the structural schematic diagram of the optical imaging system of Example 3.

[0167] As Figure 11 shown, the optical imaging system sequentially includes a stop 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 from the object side to the image side.

[0168] The first lens E1 has a positive optical 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 a negative optical 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 a negative optical 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 a positive optical 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 a negative optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has a positive optical 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 a negative optical power. The object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The filter E8 has an object side surface S15 of the filter and an image side surface S16 of the filter. The light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0169] In this example, the total effective focal length f of the optical imaging system is 5.30 mm, the maximum field of view angle FOV of the optical imaging system is 86.7°, the total length TTL of the optical imaging system is 6.20 mm, half of the diagonal length of the effective pixel region on the imaging surface of the optical imaging system ImgH is 5.27 mm, and the f-number f / EPD of the optical imaging system is 1.84.

[0170] Table 5 shows the basic structural parameter table of the optical imaging system in Example 3. Among them, the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0171]

[0172] Table 5

[0173] Table 6 gives the higher-order term coefficients that can be used for the aspherical mirror surfaces S1 - S14 in Example 3. The surface profiles of the aspherical surfaces can be defined by the formula (1) given in Example 1.

[0174]

[0175]

[0176] Table 6

[0177] Figure 12 shows the axial chromatic aberration curve of the optical imaging system in Example 3, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the optical imaging system. Figure 13 shows the astigmatism curve of the optical imaging system in Example 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14The distortion curve of the optical imaging system of Example 3 is shown, which represents the distortion magnitude values corresponding to different field angles of view. Figure 15 The longitudinal chromatic aberration curve of the optical imaging system of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after light passes through the optical imaging system.

[0178] According to Figures 12 to 15 it can be known that the optical imaging system given in Example 3 can achieve good imaging quality.

[0179] Example 4

[0180] As Figures 16 to 20 shown, the optical imaging system of Example 4 of the present application is described. Figure 16 The structural schematic diagram of the optical imaging system of Example 4 is shown.

[0181] As Figure 16 shown, the optical imaging system sequentially includes a stop 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 from the object side to the image side.

[0182] The first lens E1 has a positive optical 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 a negative optical 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 a negative optical 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 a positive optical 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 a negative optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has a positive optical 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 a negative optical power. The object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The filter E8 has an object side surface S15 of the filter and an image side surface S16 of the filter. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0183] In this example, the total effective focal length f of the optical imaging system is 5.31 mm, the maximum field angle of view FOV of the optical imaging system is 84.3°, the total length TTL of the optical imaging system is 6.20 mm, half of the diagonal length of the effective pixel region on the imaging surface of the optical imaging system ImgH is 5.64 mm, and the aperture number f / EPD of the optical imaging system is 1.76.

[0184] Table 7 shows the basic structural parameter table of the optical imaging system in Example 4, where the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0185]

[0186] Table 7

[0187] Table 8 gives the higher-order term coefficients that can be used for each aspherical mirror S1 - S14 in Example 4, and the surface profiles of each aspherical surface can be defined by the formula (1) given in Example 1.

[0188]

[0189]

[0190] Table 8

[0191] Figure 17 shows the axial chromatic aberration curve of the optical imaging system in Example 4, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical imaging system. Figure 18 shows the astigmatism curve of the optical imaging system in Example 4, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 19 shows the distortion curve of the optical imaging system in Example 4, which represents the distortion magnitude values corresponding to different field angles. Figure 20 shows the lateral chromatic aberration curve of the optical imaging system in Example 4, which represents the deviation of different image heights on the imaging plane after the light rays pass through the optical imaging system.

[0192] According to Figures 17 to 20 it can be seen that the optical imaging system given in Example 4 can achieve good imaging quality.

[0193] Example 5

[0194] As Figures 21 to 25 shown, the optical imaging system of Example 5 of the present application is described. Figure 21 shows the structural schematic diagram of the optical imaging system in Example 5.

[0195] As Figure 21 shown, the optical imaging system sequentially includes a stop 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 from the object side to the image side.

[0196] The first lens E1 has a positive optical 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 a negative optical 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 a negative optical 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 a positive optical 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 a negative optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has a positive optical 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 a negative optical power. The object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The filter E8 has an object side surface S15 of the filter and an image side surface S16 of the filter. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0197] In this example, the total effective focal length f of the optical imaging system is 5.18 mm, the maximum field of view angle FOV of the optical imaging system is 84.0°, the total length TTL of the optical imaging system is 6.11 mm, half of the diagonal length of the effective pixel region on the imaging surface of the optical imaging system ImgH is 5.27 mm, and the f-number f / EPD of the optical imaging system is 1.74.

[0198] Table 9 shows the basic structural parameter table of the optical imaging system of Example 5, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0199]

[0200] Table 9

[0201] Table 10 gives the higher-order term coefficients that can be used for the aspherical mirror surfaces S1 - S14 in Example 5. The surface shape of each aspherical surface can be defined by the formula (1) given in Example 1.

[0202]

[0203]

[0204] Table 10

[0205] Figure 22 shows the axial chromatic aberration curve of the optical imaging system of Example 5, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the optical imaging system. Figure 23 shows the astigmatism curve of the optical imaging system of Example 5, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 24The distortion curve of the optical imaging system of Example 5 is shown, which represents the distortion magnitude values corresponding to different field angles of view. Figure 25 The longitudinal chromatic aberration curve of the optical imaging system of Example 5 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging system.

[0206] According to Figures 22 to 25 it can be known that the optical imaging system given in Example 5 can achieve good imaging quality.

[0207] Example 6

[0208] As Figures 26 to 30 shown, the optical imaging system of Example 6 of the present application is described. Figure 26 The structural schematic diagram of the optical imaging system of Example 6 is shown.

[0209] As Figure 26 shown, the optical imaging system sequentially includes a stop 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 plane S17 from the object side to the image side.

[0210] The first lens E1 has a positive optical 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 a negative optical 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 a negative optical 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 a positive optical power. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has a negative optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has a positive optical 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 a negative optical power. The object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The filter E8 has an object side surface S15 of the filter and an image side surface S16 of the filter. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging plane S17.

[0211] In this example, the total effective focal length f of the optical imaging system is 5.56 mm, the maximum field angle of view FOV of the optical imaging system is 87.2°, the total length TTL of the optical imaging system is 6.49 mm, half of the diagonal length of the effective pixel region on the imaging plane of the optical imaging system ImgH is 5.53 mm, and the f-number f / EPD of the optical imaging system is 1.86.

[0212] Table 11 shows the basic structural parameter table of the optical imaging system in Example 6, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0213]

[0214] Table 11

[0215] Table 12 gives the higher-order term coefficients available for each aspherical mirror S1 - S14 in Example 6, and the surface profiles of each aspherical surface can be defined by the formula (1) given in Example 1.

[0216]

[0217]

[0218] Table 12

[0219] Figure 27 shows the axial chromatic aberration curve of the optical imaging system in Example 6, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical imaging system. Figure 28 shows the astigmatism curve of the optical imaging system in Example 6, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 29 shows the distortion curve of the optical imaging system in Example 6, which represents the distortion magnitude values corresponding to different field angles. Figure 30 shows the longitudinal chromatic aberration curve of the optical imaging system in Example 6, which represents the deviation of different image heights of light rays on the imaging plane after passing through the optical imaging system.

[0220] According to Figures 27 to 30 it can be known that the optical imaging system given in Example 6 can achieve good imaging quality.

[0221] Example 7

[0222] As Figures 31 to 35 shown, the optical imaging system in Example 7 of the present application is described. Figure 31 shows the structural schematic diagram of the optical imaging system in Example 7.

[0223] As Figure 31 shown, the optical imaging system sequentially includes a stop 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 from the object side to the image side.

[0224] The first lens E1 has a positive optical 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 a negative optical 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 a negative optical power. The object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave. The fourth lens E4 has a positive optical 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 a negative optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has a positive optical 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 a negative optical power. The object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The filter E8 has an object side surface S15 of the filter and an image side surface S16 of the filter. The light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0225] In this example, the total effective focal length f of the optical imaging system is 5.30 mm, the maximum field of view angle FOV of the optical imaging system is 84.96°, the total length TTL of the optical imaging system is 6.21 mm, half of the diagonal length of the effective pixel region on the imaging surface of the optical imaging system ImgH is 5.27 mm, and the f-number f / EPD of the optical imaging system is 1.84.

[0226] Table 13 shows the basic structural parameter table of the optical imaging system in Example 7, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0227]

[0228] Table 13

[0229] Table 14 gives the higher-order term coefficients available for the aspherical mirror surfaces S1 - S14 in Example 7. The surface shape of each aspherical surface can be defined by the formula (1) given in Example 1.

[0230] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -1.7187E-02 -4.9129E-03 -2.2851E-03 -7.2628E-04 -2.2210E-04 -1.7180E-05 -9.3287E-06 S2 -5.0364E-02 7.6862E-03 -1.6605E-03 6.9181E-04 5.8685E-05 -3.9429E-05 -2.2969E-05 S3 1.2328E-02 1.6201E-02 8.1266E-04 1.5233E-03 1.6708E-04 -5.4304E-06 -2.5361E-05 S4 4.6584E-02 8.1526E-03 1.1767E-03 1.0085E-03 3.7103E-04 1.4601E-04 6.9252E-05 S5 -9.9493E-02 -7.3343E-03 3.8041E-07 7.8722E-04 3.9538E-04 1.5940E-04 7.7821E-05 S6 1.1243E-02 5.8775E-02 -2.6317E-02 8.4884E-03 -1.9476E-03 1.1515E-03 -7.3265E-04 S7 -1.9770E-01 3.6940E-02 6.3314E-03 -1.1614E-04 -1.4696E-03 -1.3039E-04 9.7190E-05 S8 -2.5532E-01 3.2458E-02 1.2523E-02 2.6635E-03 -1.1831E-03 -5.0077E-04 -2.2853E-04 S9 -7.7767E-01 3.6765E-03 6.7109E-03 2.9501E-02 3.2786E-04 9.4382E-05 -2.2081E-03 S10 -2.5250E+00 4.7857E-01 -1.1956E-01 4.7521E-02 -3.0554E-02 9.6441E-03 -1.6218E-03 S11 -4.7048E+00 1.0309E+00 -1.7262E-01 2.2454E-03 -7.0827E-03 1.5061E-02 -1.4562E-02 S12 -1.1650E+00 -1.1945E-01 1.8813E-01 -8.5069E-02 4.5461E-02 -1.3164E-02 2.8302E-03 S13 -1.2041E+00 -2.3428E-01 -2.0278E-01 -1.3129E-01 -5.3753E-02 -2.3371E-02 4.8369E-02 S14 -6.3356E-01 8.1979E-02 5.8768E-02 -1.7253E-02 -5.1915E-03 8.0606E-05 2.3751E-04 Surface number A18 A20 A22 A24 A26 A28 A30 S1 1.1536E-05 -4.8272E-06 4.4854E-07 -2.9069E-06 1.6223E-06 -5.3189E-06 0.0000E+00 S2 -2.1096E-05 -1.1592E-07 -2.4638E-07 3.7628E-06 9.2720E-07 2.8829E-06 0.0000E+00 S3 -2.0010E-05 -1.0380E-05 -5.9592E-06 -8.2612E-06 -4.4128E-06 -3.9060E-06 0.0000E+00 S4 1.8550E-05 6.7811E-06 -6.5151E-06 -5.3039E-06 -3.9075E-06 1.4881E-06 0.0000E+00 S5 3.0671E-05 1.6291E-05 5.5790E-06 8.8054E-09 -1.2000E-07 -2.7209E-06 0.0000E+00 S6 2.9573E-04 -1.5909E-05 -1.1172E-04 1.2716E-04 -8.0065E-05 3.7692E-05 0.0000E+00 S7 1.1190E-04 -2.1617E-05 1.6615E-06 -1.0073E-05 8.5907E-06 -2.0369E-06 0.0000E+00 S8 7.3697E-05 1.4290E-05 2.9363E-05 -6.0338E-06 -2.0318E-06 -2.2787E-06 0.0000E+00 S9 -3.6216E-05 -1.3071E-04 1.2185E-04 -1.8395E-05 -1.3412E-05 -1.5650E-05 1.1667E-05 S10 2.2869E-03 -1.3449E-03 2.4788E-04 -1.4435E-04 4.7335E-05 -3.7368E-05 5.1152E-06 S11 8.8639E-03 -2.1175E-03 -3.5224E-04 6.7242E-05 5.4005E-04 -3.4554E-04 -1.4060E-05 S12 -5.1716E-03 9.4580E-04 -3.4134E-04 7.7004E-04 -3.0681E-04 4.5114E-04 -1.0310E-04 S13 4.2081E-02 7.6558E-03 -1.5533E-03 -8.5339E-03 -6.8745E-03 -1.5648E-03 -2.9325E-04 S14 2.1348E-03 -1.6879E-03 -1.2614E-03 1.6058E-03 -8.5665E-04 3.0021E-04 -6.0953E-05

[0231] Table 14

[0232] Figure 32 Shows the axial chromatic aberration curve of the optical imaging system in Example 7, which represents the deviation of the focus points of light rays with different wavelengths after passing through the optical imaging system. Figure 33 Shows the astigmatism curve of the optical imaging system in Example 7, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 34 Shows the distortion curve of the optical imaging system in Example 7, which represents the distortion magnitude values corresponding to different field of view angles. Figure 35The longitudinal chromatic aberration curve of the optical imaging system of Example 7 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging system.

[0233] According to Figures 32 to 35 it can be seen that the optical imaging system given in Example 7 can achieve good imaging quality.

[0234] Example 8

[0235] As Figures 36 to 40 shown, the optical imaging system of Example 8 of the present application is described. Figure 36 The structural schematic diagram of the optical imaging system of Example 8 is shown.

[0236] As Figure 36 shown, the optical imaging system sequentially includes a stop 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 plane S17 from the object side to the image side.

[0237] The first lens E1 has a positive optical 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 a negative optical 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 a negative optical 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 a positive optical power. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has a negative optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has a positive optical 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 a negative optical power. The object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The filter E8 has an object side surface S15 of the filter and an image side surface S16 of the filter. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging plane S17.

[0238] In this example, the total effective focal length f of the optical imaging system is 5.17 mm, the maximum field of view angle FOV of the optical imaging system is 85.55°, the total length TTL of the optical imaging system is 6.20 mm, half of the diagonal length of the effective pixel region on the imaging plane of the optical imaging system ImgH is 5.59 mm, and the f-number f / EPD of the optical imaging system is 1.80.

[0239] Table 15 shows the basic structural parameter table of the optical imaging system of Example 8, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0240]

[0241] Table 16 gives the higher-order term coefficients that can be used for each aspherical mirror surface S1 - S14 in Example 8, and the surface shape of each aspherical surface can be defined by formula (1) given in Example 1.

[0242] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -2.4669E-02 -1.5595E-03 -1.8023E-03 -6.1702E-05 -2.6727E-04 1.0234E-04 -8.8761E-05 S2 -4.3739E-02 1.1132E-02 -4.5998E-03 1.1408E-03 -1.7590E-04 4.3486E-05 4.2375E-05 S3 1.1846E-02 1.2420E-02 -3.7039E-03 1.4477E-03 -1.1659E-04 1.6203E-05 5.5357E-05 S4 4.2187E-02 7.3994E-03 -1.0168E-03 3.5331E-04 2.1451E-05 -5.2952E-06 3.7607E-05 S5 -8.8894E-02 -5.7664E-03 -7.3152E-04 -5.0295E-06 -2.6646E-05 2.3700E-05 -1.7345E-05 S6 -1.3946E-01 7.8256E-03 2.9629E-03 1.5609E-03 1.4664E-04 1.1876E-04 3.3641E-05 S7 -2.1111E-01 4.1920E-02 5.9469E-03 -6.7260E-04 -1.3059E-03 4.2972E-05 1.5921E-04 S8 -2.6828E-01 3.2823E-02 1.0986E-02 2.3877E-03 -6.8047E-04 -1.7892E-04 4.7143E-05 S9 -6.9640E-01 -1.6576E-02 -1.2690E-02 2.1862E-02 1.9760E-03 1.7183E-03 -7.7813E-04 S10 -2.2327E+00 4.0656E-01 -1.0371E-01 4.7834E-02 -2.1984E-02 4.4210E-03 -1.5083E-03 S11 -4.0225E+00 7.4088E-01 -8.2443E-02 8.5526E-03 -1.8053E-02 1.7314E-02 -1.1098E-02 S12 -9.1718E-01 -2.0531E-01 1.6843E-01 -7.8592E-02 3.4675E-02 -5.5097E-03 3.5678E-03 S13 3.1800E+00 -4.9651E-01 1.1346E-01 -7.5979E-03 -2.0720E-02 2.0845E-02 -8.7235E-03 S14 -4.2034E-01 4.4062E-02 5.3226E-02 -1.0027E-02 -6.0944E-03 1.5306E-03 -1.4627E-03 Surface number A18 A20 A22 A24 A26 A28 A30 S1 5.7094E-05 -3.1636E-05 2.7441E-05 2.6942E-06 1.9102E-05 -2.1549E-05 0.0000E+00 S2 -5.3381E-05 2.4179E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -2.5769E-05 3.8838E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -2.6420E-05 2.4318E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 -1.9916E-06 -1.7498E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.7513E-05 -1.1393E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -2.6676E-05 -1.6231E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -2.2575E-05 -4.9548E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 1.7074E-04 -1.8573E-04 -3.7989E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 1.5383E-03 -8.6769E-04 2.3330E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 3.1116E-03 9.5328E-05 3.0285E-04 -9.8927E-04 4.7101E-04 9.4890E-06 -3.8176E-05 S12 -2.2307E-03 8.4238E-04 -5.4528E-04 -2.3487E-04 -2.6324E-04 -1.1278E-04 1.6813E-04 S13 -1.0846E-03 4.2194E-03 -3.5422E-03 1.6395E-03 -1.0630E-04 -2.3310E-04 6.1535E-05 S14 1.5963E-03 -1.4324E-05 -1.2555E-03 1.1911E-03 -7.6378E-04 3.0696E-05 7.8379E-05

[0243] Table 16

[0244] Figure 37 shows the axial chromatic aberration curve of the optical imaging system in Example 8, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical imaging system. Figure 38 shows the astigmatism curve of the optical imaging system in Example 8, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 39 shows the distortion curve of the optical imaging system in Example 8, which represents the distortion magnitude values corresponding to different field angles of view. Figure 40 shows the longitudinal chromatic aberration curve of the optical imaging system in Example 8, which represents the deviation of different image heights on the imaging plane after light rays pass through the optical imaging system.

[0245] According to Figures 37 to 40 it can be known that the optical imaging system given in Example 8 can achieve good imaging quality.

[0246] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 17.

[0247] Conditional expression / Example 1 2 3 4 5 6 7 8 TTL / ImgH 1.18 1.17 1.18 1.10 1.16 1.17 1.18 1.11 f7 / R13 2.18 2.16 2.15 2.14 2.10 2.16 2.15 2.19 (V6 + V7) / 2 / (f6 - f7) 8.41 8.02 8.43 7.94 8.56 8.02 8.42 7.94 R14 / R13 6.76 7.19 7.29 7.52 8.47 7.19 7.32 6.69 f * tan(FOV / 2) 5.15 5.28 5.00 4.81 4.66 5.29 4.85 4.79 f1 / (DT11 + DT12)+f2 / (DT21 + DT22) -4.41 -3.71 -3.50 -2.99 -2.69 -3.65 -3.88 -3.30 T67 / ∑AT 0.40 0.40 0.40 0.41 0.40 0.40 0.39 0.42 (R11 / f6) / (R13 / f7) 1.06 1.05 1.04 1.04 1.02 1.05 1.04 1.07 R2 / (N1 - 1) / [R4 / (N2 - 1)]+R4 / (N2 - 1) / [R6 / (N3 - 1)] 1.89 2.19 2.29 3.13 3.03 2.05 2.24 2.81 [V1 / (CT1 + T12)-V2 / (CT2 + T23)-V3 / (CT3 + T34)] / 3 -3.40 -3.36 -3.66 -4.04 -2.89 -3.36 -2.22 -3.05 1 / (SAG11 / f1 - SAG41 / f4 - SAG61 / f6) 4.14 4.01 3.97 4.13 3.80 4.01 3.83 4.52 (f3 + f4) / (f3 - f4) 0.32 0.30 0.31 0.66 0.47 0.68 0.22 0.76 f123 / (R1 + R3 + R5)-f45 / (R7 + R9) 0.53 0.52 0.50 0.43 0.42 0.28 0.25 0.38 T45 / (ET4 + ET5)+T45 / (CT4 + CT5) 1.88 1.85 1.84 2.02 1.78 1.85 1.83 1.92 |f6 / f7| 0.71 0.71 0.71 0.71 0.73 0.71 0.71 0.69 |f6 / f5| 0.56 0.56 0.57 0.60 0.58 0.56 0.58 0.59 |f6 / f4| 0.11 0.11 0.11 0.11 0.11 0.07 0.11 0.11 f67 / f6 - f67 / f7 2.82 2.85 2.86 2.85 2.95 2.85 2.84 2.75 DT72 / DT71 1.04 1.05 1.05 1.08 1.08 1.05 1.06 1.11 (R12 + R11) / CT6-(R12 - R11) / (T56 + CT6) 9.99 9.85 9.79 8.56 9.60 9.86 9.47 8.41 EPD / (R2 - R1)+EPD / (DT11 + DT12) 1.65 1.56 1.54 1.44 1.41 1.55 1.53 1.48

[0248] Table 17

[0249] Table 18 gives the effective focal lengths f of the optical imaging systems of Examples 1 to 8, and the effective focal lengths f1 to f7 of each lens.

[0250] Basic data / Example 1 2 3 4 5 6 7 8 f1(mm) 5.06 5.11 4.81 4.90 4.55 5.10 4.78 4.94 f2(mm) -15.58 -14.45 -13.21 -12.49 -11.20 -14.22 -14.22 -13.06 f3(mm) -49.47 -49.64 -48.87 -126.96 -70.12 -213.68 -37.82 -195.94 f4(mm) 25.74 26.61 25.52 26.31 25.42 40.50 24.07 26.42 f5(mm) -4.91 -5.15 -4.89 -4.93 -4.78 -5.15 -4.77 -4.95 f6(mm) 2.76 2.91 2.77 2.94 2.77 2.91 2.76 2.90 f7(mm) -3.91 -4.09 -3.88 -4.13 -3.79 -4.08 -3.90 -4.17 f(mm) 5.34 5.58 5.30 5.31 5.18 5.56 5.30 5.17 TTL(mm) 6.20 6.50 6.20 6.20 6.11 6.49 6.21 6.20 ImgH(mm) 5.27 5.53 5.27 5.64 5.27 5.53 5.27 5.59 FOV(°) 88.0 86.8 86.7 84.3 84.0 87.2 84.96 85.55 f / EPD 1.88 1.86 1.84 1.76 1.74 1.86 1.84 1.80

[0251] Table 18

[0252] This application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0253] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0254] 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 forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0255] It should be noted that the terms "first", "second", etc. in the description 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 such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein.

[0256] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An optical imaging system, characterized in that, The optical imaging system only has seven lenses, which sequentially include, from the object side to the image side of the optical imaging system: A first lens, the focal length of the first lens is positive, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; A second lens, the focal length of the second lens is negative, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; A third lens, the focal length of the third lens is negative, and the image side surface of the third lens is concave; A fourth lens, the focal length of the fourth lens is positive, and the object side surface of the fourth lens is convex; A fifth lens, the focal length of the fifth lens is negative, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave; A sixth lens, the focal length of the sixth lens is positive, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave; A seventh lens, the focal length of the seventh lens is negative, and the curvature radius of the object side surface and the curvature radius of the image side surface of the seventh lens are less than zero; The following is satisfied between the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens: 6.69 ≤ R14 / R13 ≤ 8.47; The following is satisfied between the distance TTL on the optical axis of the optical imaging system from the object side surface of the first lens to the imaging surface of the optical imaging system and half ImgH of the diagonal length of the effective pixel area on the imaging surface: 1.10 ≤ TTL / ImgH ≤ 1.18; The following is satisfied between the effective focal length f7 of the seventh lens and the curvature radius R13 of the object side surface of the seventh lens: 2.10 ≤ f7 / R13 ≤ 2.19; The following is satisfied between the dispersion coefficient V6 of the sixth lens, the dispersion coefficient V7 of the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens: 7.94 ≤ (V6 + V7) / 2 / (f6 - f7) ≤ 8.

56.

2. The optical imaging system according to claim 1, wherein, The following is satisfied between the effective focal length f of the optical imaging system and the maximum field of view angle FOV of the optical imaging system: 4.66 ≤ f*tan(FOV / 2) ≤ 5.

29.

3. The optical imaging system according to claim 1, wherein The following is satisfied between the effective focal length f1 of the first lens, the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, the effective focal length f2 of the second lens, the maximum effective radius DT21 of the object side surface of the second lens, and the maximum effective radius DT22 of the image side surface of the second lens: -4.41 ≤ f1 / (DT11 + DT12) + f2 / (DT21 + DT22) ≤ -2.

69.

4. The optical imaging system according to claim 1, wherein The air space T67 between the sixth lens and the seventh lens on the optical axis satisfies: T67 > Tij, where Tij is the air space between the i-th lens and the j-th lens on the optical axis, i takes values from 1, 2, 3, 4, 5, and j = i + 1. The air space T67 between the sixth lens and the seventh lens on the optical axis and the sum ∑AT of the air spaces between adjacent two lenses in the optical imaging system on the optical axis satisfy: 0.39 ≤ T67 / ∑AT ≤ 0.

41.

5. The optical imaging system according to claim 1, wherein The curvature radius R11 of the object side surface of the sixth lens is less than 1.5, the curvature radius of the object side surface of the sixth lens is less than that of the object side surface of the seventh lens. The effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R13 of the object side surface of the seventh lens satisfy: 1.02 ≤ (R11 / f6) / (R13 / f7) ≤ 1.

07.

6. The optical imaging system according to claim 1, wherein The curvature radius R2 of the image side surface of the first lens, the refractive index N1 of the first lens, the curvature radius R4 of the image side surface of the second lens, the refractive index N2 of the second lens, the curvature radius R6 of the image side surface of the third lens, and the refractive index N3 of the third lens satisfy: 1.89 ≤ R2 / (N1 - 1) / [R4 / (N2 - 1)] + R4 / (N2 - 1) / [R6 / (N3 - 1)] ≤ 3.

13.

7. The optical imaging system according to claim 1, wherein The Abbe number V1 of the first lens, the central thickness CT1 of the first lens, the air space T12 between the first lens and the second lens on the optical axis, the Abbe number V2 of the second lens, the central thickness CT2 of the second lens, the air space T23 between the second lens and the third lens on the optical axis, the Abbe number V3 of the third lens, the central thickness CT3 of the third lens, and the air space T34 between the third lens and the fourth lens on the optical axis satisfy: -4.04 ≤ [V1 / (CT1 + T12) - V2 / (CT2 + T23) - V3 / (CT3 + T34)] / 3 ≤ -2.

22.

8. The optical imaging system according to any one of claims 1 to 7, characterized in that, The axial distance SAG11 between the intersection point of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, the effective focal length f1 of the first lens, the axial distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens, the effective focal length f4 of the fourth lens, the axial distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens, and the effective focal length f6 of the sixth lens satisfy: 3.80 ≤ 1 / (SAG11 / f1 - SAG41 / f4 - SAG61 / f6) ≤ 4.

52.

9. The optical imaging system according to any one of claims 1 to 7, characterized in that, The effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: 0.22 ≤ (f3 + f4) / (f3 - f4) ≤ 0.

76.

10. The optical imaging system according to any one of claims 1 to 7, characterized in that, The combined focal length f123 of the first lens, the second lens, and the third lens, the combined focal length f45 of the fourth lens and the fifth lens, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R7 of the object side surface of the fourth lens, and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 0.25 ≤ f123 / (R1 + R3 + R5) - f45 / (R7 + R9) ≤ 0.

53.

11. The optical imaging system according to any one of claims 1 to 7, characterized in that, The air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the third lens and the fourth lens on the optical axis, and the air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the fifth lens and the sixth lens on the optical axis. The air gap T45 between the fourth lens and the fifth lens on the optical axis, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the center thickness CT4 of the fourth lens, and the center thickness CT5 of the fifth lens satisfy: 1.78 ≤ T45 / (ET4 + ET5) + T45 / (CT4 + CT5) ≤ 2.

02.

12. The optical imaging system according to any one of claims 1 to 7, characterized in that, The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: 0.69 ≤ |f6 / f7| ≤ 0.

73. The effective focal length f6 of the sixth lens and the effective focal length f5 of the fifth lens satisfy: 0.56 ≤ |f6 / f5| ≤ 0.

60. The effective focal length f6 of the sixth lens and the effective focal length f4 of the fourth lens satisfy: 0.07 ≤ |f6 / f4| ≤ 0.

11.

13. The optical imaging system according to any one of claims 1 to 7, characterized in that, The combined focal length f67 of the sixth lens and the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: 2.75 ≤ f67 / f6 - f67 / f7 < 3.

0.

14. The optical imaging system according to any one of claims 1 to 7, characterized in that, The maximum effective radius of the object side surface of the seventh lens is less than 5. The maximum effective radius DT71 of the object side surface of the seventh lens and the maximum effective radius DT72 of the image side surface of the seventh lens satisfy: 1.0 < DT72 / DT71 ≤ 1.

11.

15. The optical imaging system according to any one of claims 1 to 7, characterized in that, The center thickness CT7 of the seventh lens is less than the thickness CT7i along the extension direction of the optical axis at any position from the half of the maximum effective radius of the object side surface of the seventh lens to the center of the seventh lens.

16. The optical imaging system according to any one of claims 1 to 7, characterized in that, The radius of curvature R12 of the image side surface of the sixth lens, the radius of curvature R11 of the object side surface of the sixth lens, the center thickness CT6 of the sixth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 8.41 ≤ (R12 + R11) / CT6 - (R12 - R11) / (T56 + CT6) < 10.

0.

17. The optical imaging system according to any one of claims 1 to 7, characterized in that, The entrance pupil diameter EPD of the optical imaging system, the radius of curvature R2 of the image side of the first lens, the radius of curvature R1 of the object side of the first lens, the maximum effective radius DT11 of the object side of the first lens, and the maximum effective radius DT12 of the image side of the first lens satisfy: 1.41 ≤ EPD / (R2 - R1) + EPD / (DT11 + DT12) ≤ 1.

65.

18. The optical imaging system according to any one of claims 1 to 7, characterized in that, The first lens to the seventh lens are all non-cemented lenses.

19. An optical imaging system, characterized in that, The optical imaging system only has seven lenses, which sequentially include from the object side to the image side of the optical imaging system: A first lens, the focal length of the first lens is positive, the object side of the first lens is convex, and the image side of the first lens is concave; A second lens, the focal length of the second lens is negative, the object side of the second lens is convex, and the image side of the second lens is concave; A third lens, the focal length of the third lens is negative, and the image side of the third lens is concave; A fourth lens, the focal length of the fourth lens is positive, and the object side of the fourth lens is convex; A fifth lens, the focal length of the fifth lens is negative, the object side of the fifth lens is convex, and the image side of the fifth lens is concave; A sixth lens, the focal length of the sixth lens is positive, the object side of the sixth lens is convex, and the image side of the sixth lens is concave; A seventh lens, the focal length of the seventh lens is negative, and the radius of curvature of the object side of the seventh lens and the radius of curvature of the image side of the seventh lens are less than zero; The distance TTL on the optical axis of the object side of the first lens to the imaging surface of the optical imaging system and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: 1.10 ≤ TTL / ImgH ≤ 1.18; The Abbe number V6 of the sixth lens, the Abbe number V7 of the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: 7.94 ≤ (V6 + V7) / 2 / (f6 - f7) ≤ 8.56; The Abbe number V1 of the first lens, the central thickness CT1 of the first lens, the air gap T12 on the optical axis between the first lens and the second lens, the Abbe number V2 of the second lens, the central thickness CT2 of the second lens, the air gap T23 on the optical axis between the second lens and the third lens, the Abbe number V3 of the third lens, the central thickness CT3 of the third lens, and the air gap T34 on the optical axis between the third lens and the fourth lens satisfy: -4.04 ≤ [V1 / (CT1 + T12) - V2 / (CT2 + T23) - V3 / (CT3 + T34)] / 3 ≤ -2.

22.

20. The optical imaging system according to claim 19, wherein, The effective focal length f of the optical imaging system and the maximum field of view FOV of the optical imaging system satisfy: 4.66 ≤ f*tan(FOV / 2) ≤ 5.

29.

21. The optical imaging system according to claim 19, wherein The following relationships are satisfied among the effective focal length f1 of the first lens, the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, the effective focal length f2 of the second lens, the maximum effective radius DT21 of the object side surface of the second lens, and the maximum effective radius DT22 of the image side surface of the second lens: -4.41 ≤ f1 / (DT11 + DT12) + f2 / (DT21 + DT22) ≤ -2.

69.

22. The optical imaging system according to claim 19, wherein The air space T67 between the sixth lens and the seventh lens on the optical axis satisfies: T67 > Tij, where Tij is the air space between the i-th lens and the j-th lens on the optical axis, i takes values of 1, 2, 3, 4, 5, and j = i + 1. The following relationship is satisfied between the air space T67 between the sixth lens and the seventh lens on the optical axis and the sum ∑AT of the air spaces between adjacent lenses of the optical imaging system on the optical axis: 0.39 ≤ T67 / ∑AT ≤ 0.

41.

23. The optical imaging system according to claim 19, wherein The curvature radius R11 of the object side surface of the sixth lens is less than 1.

5. The curvature radius of the object side surface of the sixth lens is less than that of the object side surface of the seventh lens. The following relationship is satisfied among the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R13 of the object side surface of the seventh lens: 1.02 ≤ (R11 / f6) / (R13 / f7) ≤ 1.

07.

24. The optical imaging system according to claim 19, wherein The following relationship is satisfied among the curvature radius R2 of the image side surface of the first lens, the refractive index N1 of the first lens, the curvature radius R4 of the image side surface of the second lens, the refractive index N2 of the second lens, the curvature radius R6 of the image side surface of the third lens, and the refractive index N3 of the third lens: 1.89 ≤ R2 / (N1 - 1) / [R4 / (N2 - 1)] + R4 / (N2 - 1) / [R6 / (N3 - 1)] ≤ 3.

13.

25. The optical imaging system according to claim 19, wherein The following relationship is satisfied among the axial distance SAG11 between the intersection point of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, the effective focal length f1 of the first lens, the axial distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens, the effective focal length f4 of the fourth lens, the axial distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens, and the effective focal length f6 of the sixth lens: 3.80 ≤ 1 / (SAG11 / f1 - SAG41 / f4 - SAG61 / f6) ≤ 4.

52.

26. The optical imaging system according to any one of claims 19 to 25, characterized in that, The following relationship is satisfied between the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens: 0.22 ≤ (f3 + f4) / (f3 - f4) ≤ 0.

76.

27. The optical imaging system according to any one of claims 19 to 25, characterized in that, The combined focal length f123 of the first lens, the second lens and the third lens, the combined focal length f45 of the fourth lens and the fifth lens, the curvature radius R1 of the object side of the first lens, the curvature radius R3 of the object side of the second lens, the curvature radius R5 of the object side of the third lens, the curvature radius R7 of the object side of the fourth lens, and the curvature radius R9 of the object side of the fifth lens satisfy: 0.25 ≤ f123 / (R1 + R3 + R5) - f45 / (R7 + R9) ≤ 0.

53.

28. The optical imaging system according to any one of claims 19 to 25, characterized in that The air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the third lens and the fourth lens on the optical axis, and the air gap between the fourth lens and the fifth lens on the optical axis is greater than the air gap between the fifth lens and the sixth lens on the optical axis. The air gap T45 between the fourth lens and the fifth lens on the optical axis, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens satisfy: 1.78 ≤ T45 / (ET4 + ET5) + T45 / (CT4 + CT5) ≤ 2.

02.

29. The optical imaging system according to any one of claims 19 to 25, characterized in that, The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: 0.69 ≤ |f6 / f7| ≤ 0.

73. The effective focal length f6 of the sixth lens and the effective focal length f5 of the fifth lens satisfy: 0.56 ≤ |f6 / f5| ≤ 0.

60. The effective focal length f6 of the sixth lens and the effective focal length f4 of the fourth lens satisfy: 0.07 ≤ |f6 / f4| ≤ 0.

11.

30. The optical imaging system according to any one of claims 19 to 25, characterized in that The combined focal length f67 of the sixth lens and the seventh lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: 2.75 ≤ f67 / f6 - f67 / f7 < 3.

0.

31. The optical imaging system according to any one of claims 19 to 25, characterized in that, The maximum effective radius of the object side of the seventh lens is less than 5. The maximum effective radius DT71 of the object side of the seventh lens and the maximum effective radius DT72 of the image side of the seventh lens satisfy: 1.0 < DT72 / DT71 ≤ 1.

11.

32. The optical imaging system according to any one of claims 19 to 25, characterized in that, The central thickness CT7 of the seventh lens is less than the thickness CT7i in the extension direction of the optical axis at any position from the half of the maximum effective radius of the object side of the seventh lens to the center of the seventh lens.

33. The optical imaging system according to any one of claims 19 to 25, characterized in that, The curvature radius R12 of the image side of the sixth lens, the curvature radius R11 of the object side of the sixth lens, the central thickness CT6 of the sixth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 8.41 ≤ (R12 + R11) / CT6 - (R12 - R11) / (T56 + CT6) < 10.

0.

34. The optical imaging system according to any one of claims 19 to 25, characterized in that, The entrance pupil diameter EPD of the optical imaging system, the curvature radius R2 of the image side of the first lens, the curvature radius R1 of the object side of the first lens, the maximum effective radius DT11 of the object side of the first lens, and the maximum effective radius DT12 of the image side of the first lens satisfy: 1.41 ≤ EPD / (R2 - R1) + EPD / (DT11 + DT12) ≤ 1.65.

Images