Imaging system

Abstract

The application provides an imaging system, comprising: a first lens to a seventh lens; a plurality of spacer elements, a fifth spacer element being located on an image side of a fifth lens and at least partially in contact with an image side surface of the fifth lens, and a sixth spacer element being located on an image side of a sixth lens and at least partially in contact with an image side surface of the sixth lens; a lens barrel; wherein an F number FNO of the imaging system satisfies: FNO < 2; an Abbe number V5 of the fifth lens, an Abbe number V6 of the sixth lens, an Abbe number V7 of the seventh lens, an on-axis distance EP56 of the fifth spacer element to the sixth spacer element, and an air interval T67 of the sixth lens and the seventh lens on an optical axis of the imaging system satisfy: -13 mm < (V5+V6-V7)*(EP56+T67) < 0 mm; a combined focal length f567 of the fifth lens, the sixth lens and the seventh lens, an outer diameter D6m of an image side surface of the sixth spacer element, and an inner diameter d5m of an image side surface of the fifth lens satisfy: -6 < f567 / (D6m-d5m) < 0. The application solves the problem of poor processing of the rear end lens of the imaging system in the prior art.

Description

Technical Field

[0001] This invention relates to the field of imaging equipment technology, and more specifically, to an imaging system. Background Technology

[0002] The continuous upgrading of mobile electronic devices has driven the optimization and upgrading of related industries, with the mobile phone industry being the most representative example, driving the continuous iteration and upgrading of imaging systems. As mobile phone memory continues to increase and people's pursuit of ultimate image quality grows, the number of lenses and spacers in imaging systems is also increasing. For seven-element imaging systems, the rear lens plays a significant role in correcting aberrations. However, to accommodate the size of the spacers, the lens has a large curvature and a relatively thick center, making it easy to design unreasonable dimensions in the lens structure. The shape of the effective diameter region and the thickness ratio between the edge and center are often pushed to design limits, resulting in high manufacturing difficulty. Therefore, how to design the shape of the rear lens and the size of the spacers in an imaging system to ensure high image quality while improving the manufacturability of the rear lens is an urgent problem to be solved. Summary of the Invention

[0003] The main objective of this invention is to provide an imaging system that solves the problem of poor manufacturability of the rear-end lens in existing imaging systems.

[0004] To achieve the above objectives, according to one aspect of the present invention, an imaging system is provided, comprising: a plurality of lenses, including a first lens to a seventh lens arranged sequentially from the object side to the image side of the imaging system; a plurality of spacers, wherein a fifth spacer is located on the image side of a fifth lens and at least partially contacts the image side surface of the fifth lens, and a sixth spacer is located on the image side of a sixth lens and at least partially contacts the image side surface of the sixth lens; a lens barrel, wherein the plurality of lenses and the plurality of spacers are all housed within the lens barrel; wherein the F-number of the imaging system is FNO. The following conditions must be met: FNO < 2; the Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, the Abbe number V7 of the seventh lens, the axial distance EP56 between the fifth and sixth spacers, and the air gap T67 between the sixth and seventh lenses on the optical axis of the imaging system must satisfy: -13mm < (V5 + V6 - V7) * (EP56 + T67) < 0mm; the combined focal length f567 of the fifth, sixth, and seventh lenses, the outer diameter D6m of the image-side surface of the sixth spacer, and the inner diameter d5m of the image-side surface of the fifth lens must satisfy: -6 <f567 / (D6m-d5m)<0。

[0005] According to another aspect of the present invention, an imaging system is provided, comprising: a plurality of lenses, the plurality of lenses including a first lens to a seventh lens arranged in sequence from the object side to the image side of the imaging system; a plurality of spacer elements, among the plurality of spacer elements, the fifth spacer element is located on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the sixth spacer element is located on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; a lens barrel, the plurality of lenses and the plurality of spacer elements are all accommodated in the lens barrel; wherein, the F-number FNO of the imaging system satisfies: FNO < 2; the following relationship is satisfied among the thickness CP6 of the sixth spacer element, the central thickness CT7 of the seventh lens on the optical axis, 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: -8 < (CP6 + CT7) / (R14 - R13) < 0; the following relationship is satisfied among the effective focal length f6 of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer element, the outer diameter D5m of the image side surface of the fifth spacer element, and the on-axis distance EP56 from the fifth spacer element to the sixth spacer element: 0 mm < f6 / (D6s + D5m) * EP56 < 38 mm. The present application provides a seven-lens imaging system. Since in the existing imaging system, the rear lenses, especially the sixth lens to the seventh lens, play a greater role in correcting aberrations, the lens shape is easily at the limit design, resulting in poor processability. However, in the present application, by controlling the effective focal length of the sixth lens, the central thickness and curvature radius of the seventh lens, the thickness, spacing, inner and outer diameters of the fifth spacer element and the sixth spacer element, etc., it is beneficial to ensure that the edge thickness ratio of the sixth lens and the seventh lens is within a suitable range, and improve the molding quality of the lens.

[0006] According to another aspect of the present invention, there is provided an imaging system, comprising: a plurality of lenses, including a first lens to a seventh lens arranged in sequence from the object side to the image side of the imaging system; a plurality of spacer elements, among which the fifth spacer element is located on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the sixth spacer element is located on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; a lens barrel, in which the plurality of lenses and the plurality of spacer elements are accommodated; wherein, the F-number FNO of the imaging system satisfies: FNO < 2; the air gap T56 between the fifth lens and the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, the on-axis distance EP56 from the fifth spacer element to the sixth spacer element, the refractive index N5 of the fifth lens, the refractive index N6 of the sixth lens, and the refractive index N7 of the seventh lens satisfy: -5 mm < (T56 + T67 - EP56) * (N5 + N6 + N7) < 0 mm. The present application provides a seven-lens imaging system. Since in existing imaging systems, the rear lenses, especially the fifth lens to the seventh lens, play a greater role in correcting aberrations, the lens shape is prone to being in an extreme design, resulting in poor processability. However, in the present application, by controlling the refractive indices, spacings of the fifth lens, the sixth lens, and the seventh lens, and the spacing between the fifth spacer element and the sixth spacer element, the central thickness and edge thickness of the seventh lens can be in a relatively reasonable range, reducing the risk of welding marks during the molding of the seventh lens, thereby reducing the risk of stray light caused by welding marks and improving the imaging cleanliness of the imaging system.

[0007] According to still another aspect of the present invention, there is provided an imaging system, comprising: a plurality of lenses, including a first lens to a seventh lens arranged in sequence from the object side to the image side of the imaging system; a plurality of spacer elements, among which the fifth spacer element is located on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the sixth spacer element is located on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; a lens barrel, in which the plurality of lenses and the plurality of spacer elements are accommodated; wherein, the F-number FNO of the imaging system satisfies: FNO < 2; the effective focal length f6 of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer element, the outer diameter D5m of the image side surface of the fifth spacer element, and the on-axis distance EP56 from the fifth spacer element to the sixth spacer element satisfy: 0 mm < f6 / (D6s + D5m) * EP56 < 38 mm. The present application provides a seven-lens imaging system. Since in existing imaging systems, the rear lenses, especially the sixth lens to the seventh lens, play a greater role in correcting aberrations, the lens shape is prone to being in an extreme design, resulting in poor processability. However, in the present application, by controlling the effective focal length of the sixth lens, the spacing, inner and outer diameters of the fifth spacer element and the sixth spacer element, it is beneficial to ensure that the edge thickness ratio of the sixth lens is within a suitable range and improve the molding quality of the lens.

[0008] Furthermore, the thickness CP6 of the sixth spacer element, the center thickness CT7 of the seventh lens on the optical axis, the radius of curvature R13 of the object side of the seventh lens, and the radius of curvature R14 of the image side of the seventh lens satisfy the following: -8 < (CP6 + CT7) / (R14 - R13) < 0.

[0009] Furthermore, the effective focal length f7 of the seventh lens, the outer diameter D0m of the image-side surface of the lens barrel, the inner diameter d0m of the image-side surface of the lens barrel, and the F-number FNO of the imaging system satisfy the following relationship: f7 / (D0m+d0m)*FNO>0.

[0010] Furthermore, the effective focal length f6 of the sixth lens, the outer diameter D6s of the object side of the sixth spacer element, the outer diameter D5m of the image side of the fifth spacer element, and the axial distance EP56 between the fifth and sixth spacer elements satisfy the following condition: 0mm <f6 / (D6s+D5m)*EP56<38mm。

[0011] Furthermore, the plurality of spacer elements also includes a fourth spacer element located on the image side of the fourth lens and in at least partial contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens, the inner diameter d4s of the object side of the fourth spacer element, the radius of curvature R9 of the object side of the fifth lens, and the inner diameter d4m of the image side of the fourth spacer element satisfy the following: -10<(f4 / d4s)*(R9 / d4m)<24.

[0012] Furthermore, the effective focal length f5 of the fifth lens, the radius of curvature R11 of the object side of the sixth lens, the inner diameter d5s of the object side of the fifth spacer element, and the inner diameter d5m of the image side of the fifth spacer element satisfy the following: 10 < (f5 * R11) / (d5s * d5m) < 38.

[0013] Furthermore, the plurality of spacers also includes a fourth spacer located on the image side of the fourth lens and in at least partial contact with the image side of the fourth lens. The effective focal length f5 of the fifth lens, the air gap T45 between the fourth and fifth lenses on the optical axis, the radius of curvature R8 of the image side of the fourth lens, and the axial distance EP45 between the fourth spacer and the fifth spacer satisfy the following: -2<(f5*T45) / (R8*EP45)<0.

[0014] Furthermore, the plurality of spacer elements also includes a third spacer element located on the image side of the third lens and in at least partial contact with the image side of the third lens. The radius of curvature R5 of the object side of the third lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D3s of the object side of the third spacer element, and the inner diameter d3m of the image side of the third spacer element satisfy the following: 0 < (R5 + R8) / (D3s - d3m) < 8.

[0015] Furthermore, the air gap T56 between the fifth and sixth lenses on the optical axis, the air gap T67 between the sixth and seventh lenses on the optical axis, the axial distance EP56 between the fifth and sixth spacer elements, the refractive index N5 of the fifth lens, the refractive index N6 of the sixth lens, and the refractive index N7 of the seventh lens satisfy the following: -5mm < (T56 + T67 - EP56) * (N5 + N6 + N7) < 0mm.

[0016] Furthermore, the plurality of spacer elements also includes a second spacer element located on the image side of the second lens and in at least partial contact with the image side of the second lens, and a third spacer element located on the image side of the third lens and in at least partial contact with the image side of the third lens. The radius of curvature R3 of the object side of the second lens, the axial distance EP23 between the second spacer element and the third spacer element, the radius of curvature R4 of the image side of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, the refractive index N2 of the second lens, and the refractive index N3 of the third lens satisfy the following: 0 < (R3 / EP23 + R4 / T23) * (N2 - N3) < 10.

[0017] Furthermore, the plurality of spacer elements also includes a first spacer element located on the image side of the first lens and in at least partial contact with the image side of the first lens, a second spacer element located on the image side of the second lens and in at least partial contact with the image side of the second lens, and a third spacer element located on the image side of the third lens and in at least partial contact with the image side of the third lens. The effective focal length f1 of the first lens, the inner diameter d1s of the object side of the first spacer element, the effective focal length f2 of the second lens, the inner diameter d2s of the object side of the second spacer element, the effective focal length f3 of the third lens, the inner diameter d3s of the object side of the third spacer element, and the combined focal length f123 of the first lens, the second lens, and the third lens satisfy the following: 0mm < (f1*d1s + f2*d2s + f3*d3s) / f123 < 3mm.

[0018] Furthermore, the plurality of spacer elements also includes a first spacer element located on the image side of the first lens and in at least partial contact with the image side surface of the first lens. The inner diameter d1s of the object side surface of the first spacer element, the outer diameter D1m of the image side surface of the first spacer element, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R2 of the image side surface of the first lens satisfy the following: 6mm < (d1s + D1m) * R3 / R2 < 18mm.

[0019] Furthermore, the Abbe numbers of the fifth and sixth lenses are both less than 30, and the Abbe number V6 of the sixth lens, the Abbe number V5 of the fifth lens, the inner diameter d5s of the object side of the fifth spacer element, and the inner diameter d6m of the image side of the sixth spacer element satisfy the following: 45mm < (V6-V5)*(d5s+d6m) < 57mm.

[0020] Furthermore, the maximum value of the center thickness CTmax of the first to seventh lenses on the optical axis and the minimum value of the on-axis distance EPmin between two adjacent spacer elements satisfy the following: 2 <CTmax / EPmin<7。

[0021] Furthermore, the plurality of spacers also includes a first spacer located on the image side of the first lens and in at least partial contact with the image side of the first lens, and a second spacer located on the image side of the second lens and in at least partial contact with the image side of the second lens. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d1m of the image side of the first spacer, the inner diameter d2m of the image side of the second spacer, and the axial distance EP12 between the first spacer and the second spacer satisfy the following: -26<(f1+f2) / (d1m-d2m)*EP12<0.

[0022] Furthermore, among the multiple spacer elements, the one located on the image side of the i-th lens and in at least partial contact with the image side of the i-th lens is the i-th spacer element, where i takes the values ​​1, 2, 3, 4, 5, 6. The outer diameter D4m of the image side of the fourth spacer element, the inner diameter d4m of the image side of the fourth spacer element, the outer diameter Djm of the image side of the j-th spacer element, and the inner diameter djm of the image side of the j-th spacer element satisfy the following relationship: D4m - d4m > Djm - djm, where j takes the values ​​1, 2, 3, 5, 6.

[0023] Furthermore, the plurality of spacer elements also includes a third spacer element located on the image side of the third lens and in at least partial contact with the image side of the third lens, and a fourth spacer element located on the image side of the fourth lens and in at least partial contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens, the outer diameter D4m of the image side of the fourth spacer element, and the outer diameter D3m of the image side of the third spacer element satisfy the following: 5<|f4| / (D4m-D3m)<23.

[0024] According to the technical solution of the present invention, the imaging system includes multiple lenses, multiple spacer elements, and a lens barrel. The multiple lenses include a first lens to a seventh lens arranged sequentially from the object side to the image side of the imaging system. Among the multiple spacer elements, the one located on the image side of the fifth lens and in at least partial contact with the image side surface of the fifth lens is the fifth spacer element, and the one located on the image side of the sixth lens and in at least partial contact with the image side surface of the sixth lens is the sixth spacer element. The multiple lenses and the multiple spacer elements are all housed within the lens barrel. The F-number FNO of the imaging system satisfies: FNO < 2. The Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, the Abbe number V7 of the seventh lens, the axial distance EP56 between the fifth and sixth spacers, and the air gap T67 between the sixth and seventh lenses on the optical axis of the imaging system satisfy: -13mm < (V5 + V6 - V7) * (EP56 + T67) < 0mm; the combined focal length f567 of the fifth, sixth, and seventh lenses, the outer diameter D6m of the image-side surface of the sixth spacer, and the inner diameter d5m of the image-side surface of the fifth lens satisfy: -6 <f567 / (D6m-d5m)<0。

[0025] This application provides a seven-element imaging system. In existing imaging systems, the rear lenses, especially the fifth to seventh lenses, play a significant role in correcting aberrations, and their shapes are often designed to be at their limits, resulting in poor manufacturability. However, this application, under the premise that the F-number of the imaging system is greater than 2, can effectively improve the smoothness and formability of the effective surface of the lens (the aspherical surface used to transmit effective light) by controlling the Abbe number, effective focal length, lens spacing, and the outer diameter and spacing of the fifth and sixth spacer elements of the fifth, sixth, and seventh lenses. This ensures that the lens does not have a large curved surface shape and improves the lens manufacturability. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 A schematic diagram of an imaging system according to an optional embodiment of the present invention is shown;

[0028] Figure 2 A schematic diagram of the imaging system according to Embodiment 1 of the present invention is shown;

[0029] Figures 3 to 6 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Embodiment 1 of the present invention are shown respectively.

[0030] Figure 7 A schematic diagram of the imaging system according to Embodiment 2 of the present invention is shown;

[0031] Figure 8 Shows a schematic structural diagram of the imaging system according to the third embodiment of the present invention;

[0032] Figure 9 Shows a schematic structural diagram of the imaging system according to the fourth embodiment of the present invention;

[0033] Figures 10 to 13 Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the imaging system according to the fourth embodiment of the present invention;

[0034] Figure 14 Shows a schematic structural diagram of the imaging system according to the fifth embodiment of the present invention;

[0035] Figure 15 Shows a schematic structural diagram of the imaging system according to the sixth embodiment of the present invention; <000就84> Figure 16 Shows a schematic structural diagram of the imaging system according to the seventh embodiment of the present invention;

[0037] Figures 17 to 20 Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the imaging system according to the seventh embodiment of the present invention;

[0038] [[ID=就0]] Figure 21 Shows a schematic structural diagram of the imaging system according to the eighth embodiment of the present invention;

[0039] Figure 22 Shows a schematic structural diagram of the imaging system according to the ninth embodiment of the present invention;

[0040] Figure 23 Shows a schematic diagram of the stress distribution of the imaging system according to an optional embodiment of the present invention under the condition of -6 < f567 / (D6m - d5m) < 0;

[0041] [[ID=就2]] Figure 24 Shows a schematic diagram of the stress distribution of the imaging system of the prior art under the condition of f567 / (D6m - d5m) > 0 or f567 / (D6m - d就m) < -6.

[0042] Among them, the above-mentioned drawings include the following reference numerals:

[0043] P0, Lens tube; E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; P1, First spacer element; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; P2, Second spacer element; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; P3, Third spacer element; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; P4, Fourth spacer element; E5, Fifth lens; S9, Object-side surface of the fifth lens; S10, Image-side surface of the fifth lens; P5, Fifth spacer element; E6, Sixth lens; S11, Object-side surface of the sixth lens; S12, Image-side surface of the sixth lens; P6, Sixth spacer element; E7, Seventh lens; S13, Object-side surface of the seventh lens; S14, Image-side surface of the seventh lens. Detailed Implementation

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0046] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0047] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0048] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0049] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens data in optical software) to determine convexity or concavity. For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0050] The main objective of this invention is to provide an imaging system that solves the problem of poor manufacturability of the rear-end lens in existing imaging systems.

[0051] First Implementation Method

[0052] like Figures 1 to 23 As shown, the imaging system includes multiple lenses, multiple spacers, and a lens barrel. The multiple lenses include a first lens to a seventh lens arranged sequentially from the object side to the image side of the imaging system. Among the multiple spacers, the one located on the image side of the fifth lens and in at least partial contact with the image side surface of the fifth lens is the fifth spacer, and the one located on the image side of the sixth lens and in at least partial contact with the image side surface of the sixth lens is the sixth spacer. The multiple lenses and multiple spacers are all housed within the lens barrel. The F-number FNO of the imaging system satisfies: FNO < 2. The fifth lens... The Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, the Abbe number V7 of the seventh lens, the axial distance EP56 between the fifth and sixth spacers, and the air gap T67 between the sixth and seventh lenses on the optical axis of the imaging system satisfy: -13mm < (V5 + V6 - V7) * (EP56 + T67) < 0mm; the combined focal length f567 of the fifth, sixth, and seventh lenses, the outer diameter D6m of the image-side surface of the sixth spacer, and the inner diameter d5m of the image-side surface of the fifth lens satisfy: -6 <f567 / (D6m-d5m)<0。

[0053] This application provides a seven-element imaging system. In existing imaging systems, the rear lenses, especially the fifth to seventh lenses, play a significant role in correcting aberrations, and their shapes are often designed to be at their limits, resulting in poor manufacturability. However, this application, under the premise that the F-number of the imaging system is greater than 2, can effectively improve the smoothness and formability of the effective surface of the lens (the aspherical surface used to transmit effective light) by controlling the Abbe number, effective focal length, lens spacing, and the outer diameter and spacing of the fifth and sixth spacer elements of the fifth, sixth, and seventh lenses. This ensures that the lens does not have a large curved surface shape and improves the lens manufacturability.

[0054] The imaging system of the present application also effectively balances system aberrations and reduces costs by controlling the Abbe numbers of the fifth lens, the sixth lens, and the seventh lens. At the same time, in cooperation with the fifth spacer element and the sixth spacer element, the stability during the assembly of the imaging system is improved, and the risk of assembly deformation is reduced.

[0055] As Figure 23 For the imaging system of the present application shown, under the condition of -6 < f567 / (D6m - d5m) < 0, in cooperation with the spacer element and the lens barrel at the fifth lens to the seventh lens of the rear lens, the stress is small and the distribution is relatively uniform, and the risk of assembly deformation is low, ensuring the stability of the assembly. Figure 24 In the prior art shown, under the condition of f567 / (D6m - d5m) > 0 or f567 / (D6m - d5m) < -6, the overall stress of the imaging system is large and concentrated on the structural part of the lens and the inner wall surface of the lens barrel, resulting in a high risk of deformation of the lens and the lens barrel and poor assembly stability. Figure 23 Compared with the prior art, the stress distribution of the design of the present application is greatly improved, effectively improving the assembly stability.

[0056] Preferably, -10 mm < (V5 + V6 - V7) * (EP56 + T67) < -2 mm; -5 < f567 / (D6m - d5m) < -1.

[0057] In this embodiment, between the thickness CP6 of the sixth spacer element, the central thickness CT7 of the seventh lens on the optical axis, 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: -8 < (CP6 + CT7) / (R14 - R13) < 0. By restricting (CP6 + CT7) / (R14 - R13) within a reasonable range, it is beneficial to control the edge thickness ratio of the seventh lens within a reasonable range, beneficial to the processing and forming of the seventh lens, and also helpful to meet the requirement of a large image plane within a smaller volume of the imaging system. Preferably, -6 < (CP6 + CT7) / (R14 - R13) < -2. [[ID=U18]] [[ID=U19]]

[0058] [[ID=U20]]In this embodiment, between the effective focal length f7 of the seventh lens, the outer diameter D0m of the image side surface of the lens barrel, the inner diameter d0m of the image side surface of the lens barrel, and the F number FNO of the imaging system, it satisfies: f7 / (D0m + d0m) * FNO > 0. By restricting f7 / (D0m + d0m) * FNO within a reasonable range, it is beneficial to the overall head design of the imaging system, enabling it to take into account the characteristics of a small head; at the same time, it is beneficial to the design of the aperture number of the imaging system, improving the quality of the imaging system. Preferably, 5 < f7 / (D0m + d0m) * FNO < 95.

[0059] In this embodiment, the effective focal length f6 of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer element, the outer diameter D5m of the image side surface of the fifth spacer element, and the on-axis distance EP56 from the fifth spacer element to the sixth spacer element satisfy: 0 mm < f6 / (D6s + D5m) * EP56 < 38 mm. By restricting f6 / (D6s + D5m) * EP56 within a reasonable range, it is beneficial to ensure that the edge thickness ratio of the sixth lens is within an appropriate range, improving the molding quality of the sixth lens; at the same time, by constraining the aspherical apertures of both surfaces of the sixth lens, the light transition becomes smoother, improving the light blocking efficiency of the sixth spacer element and reducing the risk of stray light. Preferably, 1.0 mm < f6 / (D6s + D5m) * EP56 < 35.0 mm.

[0060] In this embodiment, among the plurality of spacer elements, there is also a fourth spacer element located on the image side of the fourth lens and at least partially contacting the image side surface of the fourth lens. The effective focal length f4 of the fourth lens, the inner diameter d4s of the object side surface of the fourth spacer element, the curvature radius R9 of the object side surface of the fifth lens, and the inner diameter d4m of the image side surface of the fourth spacer element satisfy: -10 < (f4 / d4s) * (R9 / d4m) < 24. By restricting (f4 / d4s) * (R9 / d4m) within a reasonable range, the smoothness and easy formability of the effective surface (the aspherical surface for transmitting effective light) of the fourth lens can be improved, ensuring that the fourth lens does not have a significantly curved surface shape and improving the imaging quality. Preferably, -9 < (f4 / d4s) * (R9 / d4m) < 23.

[0061] In this embodiment, the effective focal length f5 of the fifth lens, the curvature radius R11 of the object side surface of the sixth lens, the inner diameter d5s of the object side surface of the fifth spacer element, and the inner diameter d5m of the image side surface of the fifth spacer element satisfy: 10 < (f5 * R11) / (d5s * d5m) < 38. By restricting (f5 * R11) / (d5s * d5m) within a reasonable range, the assembly step difference between the fifth lens and the sixth lens can be reduced, improving the assembly stability. Preferably, 12 < (f5 * R11) / (d5s * d5m) < 35. [[ID=In this embodiment, the plurality of spacers also includes a fourth spacer located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The effective focal length f5 of the fifth lens, the air gap T45 between the fourth and fifth lenses on the optical axis, the radius of curvature R8 of the image side surface of the fourth lens, and the axial distance EP45 between the fourth and fifth spacers satisfy the following condition: -2 < (f5*T45) / (R8*EP45) < 0. By limiting (f5*T45) / (R8*EP45) within a reasonable range, the fourth and fifth lenses are arranged more compactly while ensuring the strength of the fifth lens, which is beneficial to reducing the overall length of the imaging system. Preferably, -1.50 < (f5*T45) / (R8*EP45) < -0.05.

[0063] In this embodiment, the plurality of spacer elements further includes a third spacer element located on the image side of the third lens and at least partially in contact with the image side of the third lens. The radius of curvature R5 of the object side of the third lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D3s of the object side of the third spacer element, and the inner diameter d3m of the image side of the third spacer element satisfy the following condition: 0 < (R5 + R8) / (D3s - d3m) < 8. By limiting (R5 + R8) / (D3s - d3m) within a reasonable range, the feasibility of manufacturing the third spacer element can be ensured, and the third spacer element can be placed in a more powerful position to improve lens stray light and enhance image quality. Preferably, 1 < (R5 + R8) / (D3s - d3m) < 7.

[0064] In this embodiment, the air gap T56 between the fifth and sixth lenses on the optical axis, the air gap T67 between the sixth and seventh lenses on the optical axis, the axial distance EP56 between the fifth and sixth spacer elements, the refractive index N5 of the fifth lens, the refractive index N6 of the sixth lens, and the refractive index N7 of the seventh lens satisfy the following condition: -5mm < (T56 + T67 - EP56) * (N5 + N6 + N7) < 0mm. By limiting (T56 + T67 - EP56) * (N5 + N6 + N7) within a reasonable range, the center thickness and edge thickness of the seventh lens can be within a relatively reasonable range, reducing the risk of weld lines during the molding of the seventh lens, thereby reducing the risk of stray light caused by weld lines and improving the imaging cleanliness of the imaging system. Preferably, -4mm < (T56 + T67 - EP56) * (N5 + N6 + N7) < -1mm.

[0065] In this embodiment, the plurality of spacer elements further includes a second spacer element located on the image side of the second lens and at least partially in contact with the image side of the second lens, and a third spacer element located on the image side of the third lens and at least partially in contact with the image side of the third lens. The radius of curvature R3 of the object side of the second lens, the axial distance EP23 between the second spacer element and the third spacer element, the radius of curvature R4 of the image side of the second lens, the air gap T23 between the second and third lenses on the optical axis, the refractive index N2 of the second lens, and the refractive index N3 of the third lens satisfy the following condition: 0 < (R3 / EP23 + R4 / T23) * (N2 - N3) < 10. By limiting (R3 / EP23 + R4 / T23) * (N2 - N3) within a reasonable range, the center thickness and edge thickness of the second lens can be within a relatively reasonable range, reducing the risk of weld lines during the molding of the second lens, thereby reducing the risk of stray light caused by weld lines and improving the imaging cleanliness of the imaging system. Preferably, 2 < (R3 / EP23 + R4 / T23) * (N2 - N3) < 8.

[0066] In this embodiment, the plurality of spacer elements further includes a first spacer element located on the image side of the first lens and at least partially in contact with the image side of the first lens, a second spacer element located on the image side of the second lens and at least partially in contact with the image side of the second lens, and a third spacer element located on the image side of the third lens and at least partially in contact with the image side of the third lens. The effective focal length f1 of the first lens, the inner diameter d1s of the object side of the first spacer element, the effective focal length f2 of the second lens, the inner diameter d2s of the object side of the second spacer element, the effective focal length f3 of the third lens, the inner diameter d3s of the object side of the third spacer element, and the combined focal length f123 of the first, second, and third lenses satisfy the following: 0mm < (f1*d1s + f2*d2s + f3*d3s) / f123 < 3mm. By limiting (f1*d1s + f2*d2s + f3*d3s) / f123 within a reasonable range, the first, second, and third lenses can be made more compact, which is beneficial for reducing the overall length of the imaging system. Preferably, 0.5mm < (f1*d1s+f2*d2s+f3*d3s) / f123 < 2.5mm.

[0067] In this embodiment, among the multiple spacer elements, there is also a first spacer element located on the image side of the first lens and at least partially contacting the image side surface of the first lens. The inner diameter d1s of the object side surface of the first spacer element, the outer diameter D1m of the image side surface of the first spacer element, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R2 of the image side surface of the first lens satisfy: 6 mm < (d1s + D1m) * R3 / R2 < 18 mm. By restricting (d1s + D1m) * R3 / R2 within a reasonable range, the processing and molding feasibility of the first lens and the second lens are ensured. Preferably, 8 mm < (d1s + D1m) * R3 / R2 < 16 mm.

[0068] In this embodiment, the Abbe numbers of the fifth lens and the sixth lens are both less than 30. The Abbe number V6 of the sixth lens, the Abbe number V5 of the fifth lens, the inner diameter d5s of the object side surface of the fifth spacer element, and the inner diameter d6m of the image side surface of the sixth spacer element satisfy: 45 mm < (V6 - V5) * (d5s + d6m) < 57 mm. By restricting (V6-V5)*(d5s + d6m) within a reasonable range, the aberration of the imaging system can be better balanced. Preferably, 47 mm < (V6 - V5) * (d5s + d6m) < 55 mm.

[0069] In this embodiment, the maximum value CTmax of the central thickness of the first lens to the seventh lens on the optical axis and the minimum value EPmin of the axial distance between adjacent two spacer elements satisfy: 2 < CTmax / EPmin < 7. By restricting CTmax / EPmin within a reasonable range, each component in the imaging system has processability, and at the same time, the reliability risk of the imaging system can be reduced. Preferably, 2.5 < CTmax / EPmin < 5.5.

[0070] In this embodiment, among the multiple spacer elements, there is also a first spacer element located on the image side of the first lens and at least partially contacting the image side surface of the first lens and a second spacer element located on the image side of the second lens and at least partially contacting the image side surface of the second lens. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d1m of the image side surface of the first spacer element, the inner diameter d2m of the image side surface of the second spacer element, and the axial distance EP12 from the first spacer element to the second spacer element satisfy: -26 < (f1 + f2) / (d1m - d2m) * EP12 < 0. By restricting (f1 + f2) / (d1m - d2m) * EP12 within a reasonable range, the step difference of the effective diameters of the first lens and the second lens is restricted, which can make the light rays in the imaging system transition smoothly and reduce the optical sensitivity of the first lens and the second lens. Preferably, -24 < (f1 + f2) / (d1m - d2m) * EP12 < -3.

[0071] In this embodiment, the spacer element located on the image side of the i-th lens and in at least partial contact with the image side of the i-th lens is the i-th spacer element, where i takes the values ​​1, 2, 3, 4, 5, 6. The outer diameter D4m of the image side of the fourth spacer element, the inner diameter d4m of the image side of the fourth spacer element, the outer diameter Djm of the image side of the j-th spacer element, and the inner diameter djm of the image side of the j-th spacer element satisfy the following relationship: D4m - d4m > Djm - djm, where j takes the values ​​1, 2, 3, 5, 6. By controlling the inner and outer diameters of each spacer element, especially the fourth spacer element, it is beneficial to balance the overall sensitivity of the imaging system, making the light transition smoother, and at the same time improving the assembly stability of the imaging system.

[0072] In this embodiment, the plurality of spacer elements further includes a third spacer element located on the image side of the third lens and at least partially in contact with the image side of the third lens, and a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens, the outer diameter D4m of the image side of the fourth spacer element, and the outer diameter D3m of the image side of the third spacer element satisfy the following condition: 5 < |f4| / (D4m-D3m) < 23. By limiting |f4| / (D4m-D3m) within a reasonable range, the smoothness and formability of the effective surface of the fourth lens can be improved, ensuring that the fourth lens does not have a surface shape with large curvature, thereby improving image quality. Preferably, 7 < |f4| / (D4m-D3m) < 22.

[0073] Second Implementation Method

[0074] like Figures 1 to 23 As shown, the imaging system includes multiple lenses, multiple spacers, and a lens barrel. The multiple lenses include lenses numbered one through seven arranged sequentially from the object side to the image side of the imaging system. Among the multiple spacers, the one located on the image side of the fifth lens and in at least partial contact with its image-side surface is the fifth spacer, and the one located on the image side of the sixth lens and in at least partial contact with its image-side surface is the sixth spacer. All lenses and spacers are housed within the lens barrel. The F-number FNO of the imaging system satisfies: FNO < 2. The thickness CP6 of the sixth spacer, the center thickness CT7 of the seventh lens on the optical axis, 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 satisfy: -8 < (CP6 + CT7) / (R14 - R13) < 0. The effective focal length f6 of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer, the outer diameter D5m of the image side surface of the fifth spacer, and the axial distance EP56 between the fifth and sixth spacers satisfy: 0 mm. <f6 / (D6s+D5m)*EP56<38mm。

[0075] The present application provides a seven-piece imaging system. In the existing imaging system, the rear lenses, especially the sixth lens to the seventh lens, play a major role in correcting aberrations, and the lens shape is prone to being at the limit design, resulting in poor processability. On the premise that the F-number of the imaging system satisfies being greater than 2, by controlling the effective focal length of the sixth lens, the central thickness and curvature radius of the seventh lens, the thickness, interval, inner and outer diameters of the fifth spacer element and the sixth spacer element, it is beneficial to ensure that the edge thickness ratio of the sixth lens and the seventh lens is within a suitable range, and improve the molding quality of the lens.

[0076] The present application can also, by restricting the aspherical aperture on both sides of the sixth lens, make the light transition smoother, improve the light blocking efficiency of the sixth spacer element, reduce the risk of stray light, and at the same time meet the requirement of a large image plane within a smaller volume of the imaging system.

[0077] As Figure 23 For the imaging system of the present application shown, under the condition of -6 < f567 / (D6m - d5m) < 0, in the fifth lens to the seventh lens of the rear lens, with the cooperation of the spacer element and the lens barrel, the stress is small and the distribution is relatively uniform, and the risk of assembly deformation is low, ensuring the stability of the assembly. Figure 24 In the prior art shown, under the condition of f567 / (D6m - d5m) > 0 or f567 / (D6m - d5m) < -6, the overall stress of the imaging system is large, and it is concentrated on the structural part of the lens and the inner wall surface of the lens barrel, resulting in a high risk of deformation of the lens and the lens barrel, and poor assembly stability. Figure 23 Compared with the prior art, the stress distribution of the design of the present application is greatly improved, effectively improving the assembly stability.

[0078] Preferably, -6 < (CP6 + CT7) / (R14 - R13) < -2.

[0079] Preferably, 1.0 mm < f6 / (D6s + D5m) * EP56 < 35.0 mm.

[0080] This embodiment may also include other parametric formulas in the first embodiment, which will not be elaborated here one by one.

[0081] The third embodiment

[0082] As Figures 1 to 23As shown in the figure, the imaging system includes multiple lenses, multiple spacer elements, and a lens barrel. The multiple lenses include a first lens to a seventh lens arranged in sequence from the object side to the image side of the imaging system. Among the multiple spacer elements, the fifth spacer element is located on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the sixth spacer element is located on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens. The multiple lenses and multiple spacer elements are all accommodated in the lens barrel. Among them, the F-number FNO of the imaging system satisfies: FNO < 2; the air gap T56 between the fifth lens and the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, the axial distance EP56 from the fifth spacer element to the sixth spacer element, the refractive index N5 of the fifth lens, the refractive index N6 of the sixth lens, and the refractive index N7 of the seventh lens satisfy: -5 mm < (T56 + T67 - EP56) * (N5 + N6 + N7) < 0 mm.

[0083] The present application provides a seven-piece imaging system. Since the rear lenses, especially the fifth lens to the seventh lens, play a greater role in correcting aberrations in the existing imaging system, the lens shape is easily at the limit design, resulting in poor processability. On the premise that the F-number of the imaging system in the present application satisfies greater than 2, by controlling the refractive indices, spacings of the fifth lens, the sixth lens, and the seventh lens, and the spacing between the fifth spacer element and the sixth spacer element, the central thickness and edge thickness of the seventh lens can be in a relatively reasonable range, reducing the risk of welding marks during the molding of the seventh lens, thereby reducing the risk of stray light caused by welding marks and improving the imaging cleanliness of the imaging system.

[0084] As Figure 23 shown, when the imaging system of the present application satisfies the condition of -6 < f567 / (D6m-d5m) < 0, in cooperation with the spacer element and the lens barrel at the fifth lens to the seventh lens of the rear lens, the stress is small and the distribution is relatively uniform, and the risk of assembly deformation is low, ensuring the stability of assembly. Figure 24 In the prior art shown, when f567 / (D6m-d5m) > 0 or f567 / (D6m-d5m) < -6, the overall stress of the imaging system is large, and it is concentrated on the structural part of the lens and the inner wall surface of the lens barrel, resulting in a high risk of deformation of the lens and the lens barrel and poor assembly stability. Figure 23 As shown, compared with the prior art, the stress distribution of the design of the present application is greatly improved, effectively improving the assembly stability.

[0085] Preferably, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, the on-axis distance EP56 from the fifth spacer element to the sixth spacer element, the refractive index N5 of the fifth lens, the refractive index N6 of the sixth lens, and the refractive index N7 of the seventh lens satisfy: -4 mm < (T56 + T67 - EP56) * (N5 + N6 + N7) < -1 mm.

[0086] This embodiment may also include other parametric formulas in the first embodiment, which will not be elaborated here one by one.

[0087] The fourth embodiment

[0088] As Figures 1 to 23 shown, the imaging system includes a plurality of lenses, a plurality of spacer elements, and a lens barrel. The plurality of lenses include a first lens to a seventh lens arranged in sequence from the object side to the image side of the imaging system. Among the plurality of spacer elements, the fifth spacer element is located on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the sixth spacer element is located on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens. The plurality of lenses and the plurality of spacer elements are all accommodated in the lens barrel. Among them, the F number FNO of the imaging system satisfies: FNO < 2. The effective focal length f6 of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer element, the outer diameter D5m of the image side surface of the fifth spacer element, and the on-axis distance EP56 from the fifth spacer element to the sixth spacer element satisfy: 0 mm < f6 / (D6s + D5m) * EP56 < 38 mm.

[0089] The present application provides a seven-piece imaging system. Since the rear lenses in the existing imaging system, especially the sixth lens to the seventh lens, play a greater role in correcting aberrations, the lens shape is easily at the limit of design, resulting in poor processability. On the premise that the F number of the imaging system in the present application satisfies greater than 2, by controlling the effective focal length of the sixth lens, the interval, inner and outer diameters, etc. of the fifth spacer element and the sixth spacer element, it is beneficial to ensure that the edge thickness ratio of the sixth lens is within a suitable range and improve the forming quality of the lens.

[0090] As [[ID=​​​ Figure 23 Compared with the prior art, the design shown in this application has a greatly improved stress distribution, which effectively improves assembly stability.

[0091] Preferably, 1.0mm <f6 / (D6s+D5m)*EP56<35.0mm。

[0092] This embodiment may also include other parametric expressions as described in the first embodiment, which will not be elaborated here.

[0093] Optionally, the imaging system described above may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0094] The imaging system in this application can employ multiple lenses, such as the seven lenses mentioned above. By rationally allocating the effective focal length, surface shape, center thickness of each lens, and on-axis distance between each lens, the aperture of the imaging system can be effectively increased, the sensitivity of the lens can be reduced, and the manufacturability of the lens can be improved, making the imaging system more conducive to manufacturing and suitable for portable electronic devices such as smartphones.

[0095] In this application, at least one lens has an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in reducing distortion and astigmatism. By using an aspherical lens, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0096] However, those skilled in the art will understand that the number of lenses constituting the imaging system can be changed to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although seven lenses have been described as an example in the embodiments, the imaging system is not limited to including seven lenses. If necessary, the imaging system may also include other numbers of lenses.

[0097] Figure 1 A schematic diagram of the structure of an imaging system according to this application is shown. Figure 1 The figure also labels parameters such as d2s, D6S, and d2m to clearly and intuitively explain their meaning. To facilitate the demonstration of the imaging system structure and specific surface features, these parameters will not be shown in the accompanying figures when explaining specific examples later.

[0098] Where Dis refers to the outer diameter of the object-side surface of the i-th spacer element, dis refers to the inner diameter of the object-side surface of the i-th spacer element, Dim refers to the outer diameter of the image-side surface of the i-th spacer element, and dim refers to the inner diameter of the image-side surface of the i-th spacer element, where i is a value taken from 1, 2, 3, 4, 5, and 6. EPij refers to the distance along the optical axis between the image-side surface of the i-th spacer element and the object-side surface of the j-th spacer element, where j > i, and i is a value taken from 1, 2, 3, 4, and 5, while j is a value taken from 2, 3, 4, 5, and 6. d0s is the inner diameter of the object-side end face of the lens barrel P0, and d0m is the inner diameter of the image-side end face of the lens barrel P0. The object-side end face of the lens barrel P0 is the surface of the lens barrel P0 closest to the object side, and the image-side end face of the lens barrel P0 is the surface of the lens barrel P0 closest to the image side.

[0099] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface features and parameters applicable to the imaging systems described above.

[0100] It should be noted that any one of the following embodiments, from Embodiment 1 to Embodiment 9, is applicable to all implementation methods of this application.

[0101] Example 1

[0102] like Figures 2 to 6 The image system of Embodiment 1 of this application is described in the figure.

[0103] like Figure 2 As shown, the imaging system, from the object side to the image side, includes, in sequence, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7. The first to fourth lenses are interlocked, with the spacer element located inside the interlocking structure. The spacer element between adjacent lenses in the fourth to seventh lenses directly abuts against the lens.

[0104] like Figure 2 As shown, the object-side surface of the first lens is S1, the image-side surface of the first lens is S2, the object-side surface of the second lens is S3, the image-side surface of the second lens is S4, the object-side surface of the third lens is S5, the image-side surface of the third lens is S6, the object-side surface of the fourth lens is S7, the image-side surface of the fourth lens is S8, the object-side surface of the fifth lens is S9, the image-side surface of the fifth lens is S10, the object-side surface of the sixth lens is S11, the image-side surface of the sixth lens is S12, the object-side surface of the seventh lens is S13, and the image-side surface of the seventh lens is S14.

[0105] Table 1 shows the basic structural parameters of the imaging system in Embodiment 1, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0106]

[0107]

[0108] Table 1

[0109] Table 1 also shows the object side surface S15 and the image side surface S16 of the filter.

[0110] In this embodiment, the object-side and image-side surfaces of the first to seventh lenses are all aspherical surfaces, and the surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0111]

[0112] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; 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 i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each aspherical mirror in this embodiment.

[0113] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.6112E-01 -6.1518E-02 -1.9028E-02 -3.6395E-03 1.5561E-04 3.5968E-04 1.3563E-04 S2 -3.0450E-01 -6.8766E-04 5.9356E-03 5.8258E-05 -1.1438E-03 2.7856E-04 -1.8358E-04 S3 -1.2694E-01 7.1776E-02 5.1346E-03 -7.2669E-04 -2.3365E-03 2.5398E-04 -1.4916E-04 S4 -7.5075E-02 5.7776E-02 1.0612E-02 2.8013E-03 -1.1344E-03 -5.4702E-04 -5.9539E-04 S5 -2.6728E-01 1.1737E-02 1.5852E-02 2.2271E-03 -2.0225E-03 -1.2460E-03 -6.4889E-04 S6 -4.3915E-01 3.4481E-02 -1.5503E-03 -7.9593E-04 3.4561E-04 -2.1840E-04 -8.6394E-05 S7 -4.5051E-01 5.7871E-02 -6.2349E-03 8.7114E-04 1.4083E-03 -1.2192E-04 -7.4512E-05 S8 -1.8942E-01 3.5546E-03 6.5089E-04 4.0370E-03 1.2141E-03 2.9421E-04 1.1495E-04 S9 -3.4130E-01 -3.7821E-02 -1.3938E-02 1.7782E-03 -1.5543E-05 -9.2184E-04 -6.5727E-04 S10 -6.6391E-01 5.3369E-02 5.2368E-02 -5.2138E-03 6.6231E-03 -1.0252E-02 1.9147E-03 S11 -3.5879E-01 -2.8589E-01 1.6511E-01 -7.1354E-03 2.9414E-02 -1.6936E-02 -2.0962E-04 S12 -3.1376E-01 -2.5330E-01 6.3374E-02 -3.0290E-02 1.5001E-02 -5.7575E-04 4.3515E-05 S13 -1.9372E+00 4.8102E-01 -1.2076E-01 1.0771E-02 2.2028E-02 -3.2792E-03 -1.6163E-03 S14 -2.3821E+00 4.2164E-01 -9.2448E-02 2.1111E-02 -7.1119E-03 5.4052E-03 1.1024E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 2.0195E-05 9.1044E-05 9.4860E-05 9.0354E-05 7.0234E-05 5.0434E-05 5.2075E-05 S2 -1.0436E-04 -1.0959E-04 -7.3484E-05 2.9226E-05 1.0488E-04 1.6251E-04 7.7501E-05 S3 1.3728E-04 -1.1084E-04 -1.8560E-04 -1.9589E-04 -1.1791E-04 -4.3580E-05 -5.1526E-06 S4 -1.2276E-04 -2.7389E-08 9.5806E-05 6.8603E-05 2.7142E-05 -1.4699E-05 -3.9741E-05 S5 -1.5890E-04 4.8096E-05 1.2704E-04 8.5818E-05 3.5146E-05 7.4376E-06 7.2493E-06 S6 -9.2802E-05 1.1889E-04 -5.7342E-05 7.2569E-05 -4.9125E-05 3.1337E-05 -2.0405E-05 S7 -9.4461E-05 1.2752E-04 -6.7859E-05 8.0775E-05 -4.7676E-05 2.1846E-05 -2.4350E-05 S8 5.2971E-05 3.2563E-05 -5.6074E-06 -8.2904E-08 -6.7985E-06 2.1858E-06 -4.9617E-06 S9 -4.4414E-04 -1.0969E-04 -2.0309E-05 -5.1702E-06 1.1644E-05 3.4158E-06 1.3791E-05 S10 -3.9964E-04 1.0769E-03 -2.3208E-04 -1.0019E-04 -1.0374E-04 -2.0480E-05 4.3548E-05 S11 -2.9962E-03 1.5290E-03 -2.1397E-04 2.7716E-04 -3.9994E-05 1.8205E-05 -1.7142E-05 S12 4.4576E-05 1.8150E-04 2.2372E-04 3.0266E-04 -7.3320E-05 -3.5639E-05 -1.3869E-05 S13 6.5932E-04 2.1466E-03 -1.6252E-03 6.0756E-05 -1.7541E-04 2.8725E-04 -8.6015E-05 S14 -1.3133E-04 3.9716E-04 -7.0616E-05 3.9132E-04 -1.2126E-04 1.0426E-04 -7.4418E-05

[0114] Table 2

[0115] Figure 3 The on-axis chromatic aberration curve of the imaging system of Embodiment 1 is shown, which represents the deflection of the focal point after light of different wavelengths passes through the imaging system. Figure 4 The astigmatism curves of the imaging system of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The distortion curves of the imaging system of Embodiment 1 are shown, which represent the distortion magnitude values ​​corresponding to different field of view angles. Figure 6 The magnification chromatic aberration curve of the imaging system of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the imaging system.

[0116] Depend on Figures 3 to 6 It can be seen that the imaging system in this embodiment has good imaging quality.

[0117] Example 2

[0118] The difference from Embodiment 1 is that the parameters of the lens barrel P0 and the spacer element are different.

[0119] like Figure 7The image system of Embodiment 2 of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0120] In Embodiment 2, the curvature radius, center thickness, and other parameters of the first to seventh lenses, as well as the inter-lens spacing and higher-order image coefficients, are the same as in Embodiment 1, as shown in Tables 1 and 2. However, the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter and outer diameter of the spacer element, and the distance between the spacer elements are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the imaging system in this embodiment is as follows: Figures 3 to 6 As shown.

[0121] like Figure 7 As shown, the spacer elements are all located between two adjacent lenses and are directly attached to the lenses.

[0122] Example 3

[0123] The difference from Embodiment 1 is that the parameters of the lens barrel P0 and the spacer element are different.

[0124] like Figure 8 The image system of Embodiment 3 of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0125] In Embodiment 3, the curvature radius, center thickness, and other parameters of the first to seventh lenses, as well as the inter-lens spacing and higher-order image coefficients, are the same as in Embodiment 1, as shown in Tables 1 and 2. However, the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter and outer diameter of the spacer element, and the distance between the spacer elements are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the imaging system in this embodiment is as follows: Figures 3 to 6 As shown.

[0126] like Figure 8 As shown, the spacer elements are all located between two adjacent lenses and are directly attached to the lenses.

[0127] Example 4

[0128] The difference from Embodiment 1 is that the parameters of the lens barrel P0, the spacer element, and the lens are different.

[0129] like Figures 9 to 13 The image system of Embodiment 4 of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0130] like Figure 9As shown, the imaging system, from the object side to the image side, includes, in sequence, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7. The first to fourth lenses are interlocked, with the spacer element located inside the interlocking structure. The spacer element between adjacent lenses in the fourth to seventh lenses directly abuts against the lens.

[0131] like Figure 9 As shown, the object-side surface of the first lens is S1, the image-side surface of the first lens is S2, the object-side surface of the second lens is S3, the image-side surface of the second lens is S4, the object-side surface of the third lens is S5, the image-side surface of the third lens is S6, the object-side surface of the fourth lens is S7, the image-side surface of the fourth lens is S8, the object-side surface of the fifth lens is S9, the image-side surface of the fifth lens is S10, the object-side surface of the sixth lens is S11, the image-side surface of the sixth lens is S12, the object-side surface of the seventh lens is S13, and the image-side surface of the seventh lens is S14.

[0132] Table 3 shows the basic structural parameters of the imaging system in Embodiment 4, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0133] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless -0.9096 S1 aspherical 2.9982 1.3535 1.55 55.02 0.0001 S2 aspherical 5.8561 0.0366 -0.0291 S3 aspherical 5.5842 0.2989 1.67 20.38 -0.0208 S4 aspherical 3.5477 0.3763 0.0066 S5 aspherical 3.5835 0.6084 1.55 55.02 0.0017 S6 aspherical 4.0985 0.1920 -0.0015 S7 aspherical 3.8859 0.3690 1.55 55.02 -0.0113 S8 aspherical 6.6182 0.9274 0.1675 S9 aspherical -8.8184 0.5040 1.66 21.53 -49.3737 S10 aspherical -28.7201 0.1481 -98.9030 S11 aspherical -17.9605 0.7696 1.62 25.80 -87.8234 S12 aspherical -10.7912 0.0720 -24.9273 S13 aspherical 1.6923 0.5407 1.54 55.71 -9.6040 S14 aspherical 1.5629 1.1905 -6.1030 S15 spherical endless 0.1650 1.52 64.20 S16 spherical endless 1.9214

[0134] Table 3

[0135] Table 3 also shows the object side surface S15 and the image side surface S16 of the filter.

[0136] In this embodiment, the object-side surface and image-side surface of the first to seventh lenses are both aspherical, and the surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Embodiment 1.

[0137] Table 4 provides the higher-order coefficients that can be used for each aspherical mirror in this embodiment.

[0138]

[0139]

[0140] Table 4

[0141] Figure 10 The on-axis chromatic aberration curve of the imaging system of Embodiment 4 is shown, which represents the deflection of the focal point after light of different wavelengths passes through the imaging system. Figure 11 The astigmatism curves of the imaging system of Embodiment 4 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 12The distortion curves of the imaging system in Embodiment 4 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 13 The magnification chromatic aberration curve of the imaging system of Embodiment 4 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the imaging system.

[0142] Depend on Figures 10 to 13 It can be seen that the imaging system in this embodiment has good imaging quality.

[0143] Example 5

[0144] The difference from Embodiment 4 is that the parameters of the lens barrel P0 and the spacer element are different.

[0145] like Figure 14 The image system of Embodiment 5 of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment 4 are omitted.

[0146] In Embodiment 5 and Embodiment 4, the parameters such as the radius of curvature, center thickness, and inter-lens spacing and higher-order image coefficients of the imaging systems from the first to the seventh lens are the same, as shown in Tables 3 and 4. However, the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter and outer diameter of the spacer element, and the distance between the spacer elements are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the imaging system in this embodiment is as follows: Figures 10 to 13 As shown.

[0147] like Figure 14 As shown, the spacer elements are all located between two adjacent lenses and are directly attached to the lenses.

[0148] Example 6

[0149] The difference from Embodiment 4 is that the parameters of the lens barrel P0 and the spacer element are different.

[0150] like Figure 15 The image system of Embodiment Six of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment Four are omitted.

[0151] In Embodiment Six and Embodiment Four, the curvature radius, center thickness, and other parameters of the first to seventh lenses, as well as the inter-lens spacing and higher-order image coefficients, are the same, as shown in Tables 3 and 4. However, the parameters of the lens barrel P0, the thickness of the spacer element, the inner diameter and outer diameter of the spacer element, and the distance between the spacer elements are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the imaging system in this embodiment is as follows: Figures 10 to 13 As shown.

[0152] like Figure 15 As shown, the spacer elements are all located between two adjacent lenses and are directly attached to the lenses.

[0153] Example 7

[0154] The difference from Embodiment 1 is that the parameters of the lens barrel P0, the spacer element, and the lens are different.

[0155] like Figures 16 to 20 The image system of Embodiment Seven of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment One are omitted.

[0156] like Figure 16 As shown, the imaging system, from the object side to the image side, includes, in sequence, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7. The first to third lenses are interlocked, with the spacer element located inside the interlocking structure. The spacer element between adjacent lenses in the third to seventh lenses directly abuts against the lens.

[0157] like Figure 16 As shown, the object-side surface of the first lens is S1, the image-side surface of the first lens is S2, the object-side surface of the second lens is S3, the image-side surface of the second lens is S4, the object-side surface of the third lens is S5, the image-side surface of the third lens is S6, the object-side surface of the fourth lens is S7, the image-side surface of the fourth lens is S8, the object-side surface of the fifth lens is S9, the image-side surface of the fifth lens is S10, the object-side surface of the sixth lens is S11, the image-side surface of the sixth lens is S12, the object-side surface of the seventh lens is S13, and the image-side surface of the seventh lens is S14.

[0158] Table 5 shows the basic structural parameters of the imaging system in Embodiment 7, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0159] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless -1.0752 S1 aspherical 3.0562 1.4403 1.55 55.02 0.0335 S2 aspherical 6.5650 0.1624 0.0701 S3 aspherical 6.1073 0.4700 1.67 20.38 -0.4291 S4 aspherical 3.6699 0.2108 0.0819 S5 aspherical 3.4989 0.4962 1.55 55.02 0.1134 S6 aspherical 3.1235 0.0404 0.0000 S7 aspherical 3.0414 0.3989 1.55 55.02 0.0183 S8 aspherical 6.8142 1.0128 2.2098 S9 aspherical -10.2566 1.1108 1.66 21.53 -25.0746 S10 aspherical -45.9895 0.1840 -60.2025 S11 aspherical -23.2277 0.7876 1.62 25.80 34.5392 S12 aspherical -22.6791 0.0961 21.6581 S13 aspherical 3.0026 1.0117 1.54 55.71 -12.7571 S14 aspherical 2.6642 0.7704 -6.2690 S15 spherical endless 0.1650 1.52 64.20 S16 spherical endless 1.5259

[0160] Table 5

[0161] Table 5 also shows the object side surface S15 and the image side surface S16 of the filter.

[0162] In this embodiment, the object-side surface and image-side surface of the first to seventh lenses are both aspherical, and the surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Embodiment 1.

[0163] Table 6 provides the higher-order coefficients that can be used for each aspherical mirror in this embodiment.

[0164]

[0165]

[0166] Table 6

[0167] Figure 17 The on-axis chromatic aberration curve of the imaging system of Embodiment 7 is shown, which represents the deflection of the focal point after light of different wavelengths passes through the imaging system. Figure 18 The astigmatism curves of the imaging system of Embodiment 7 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 19 The distortion curves of the imaging system of Embodiment 7 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 20 The magnification chromatic aberration curve of the imaging system of Embodiment 7 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the imaging system.

[0168] Depend on Figures 17 to 20 It can be seen that the imaging system in this embodiment has good imaging quality.

[0169] Example 8

[0170] The difference from Embodiment 7 is that the parameters of the lens barrel P0 and the spacer element are different.

[0171] like Figure 21 The image system of Embodiment Eight of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment Seven are omitted.

[0172] In Embodiment 8 and Embodiment 7, the parameters such as the radius of curvature, center thickness, and inter-lens spacing and higher-order image coefficients of the imaging systems from the first to the seventh lens are the same, as shown in Tables 5 and 6. However, the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter and outer diameter of the spacer element, and the distance between the spacer elements are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the imaging system in this embodiment is as follows: Figures 17 to 20 As shown.

[0173] like Figure 21 As shown, the spacer elements are all located between two adjacent lenses and are directly attached to the lenses.

[0174] Example 9

[0175] The difference from Embodiment 7 is that the parameters of the lens barrel P0 and the spacer element are different.

[0176] like Figure 22 The image system of Embodiment Nine of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment Seven are omitted.

[0177] In Embodiment 9 and Embodiment 7, the parameters such as the radius of curvature, center thickness, and inter-lens spacing and higher-order image coefficients of the imaging systems from the first to the seventh lens are the same, as shown in Tables 5 and 6. However, the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter and outer diameter of the spacer element, and the distance between the spacer elements are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different. Therefore, the imaging quality of the imaging system in this embodiment is as follows: Figures 17 to 20 As shown.

[0178] like Figure 22 As shown, the spacer elements are all located between two adjacent lenses and are directly attached to the lenses.

[0179] In summary, Examples 1 to 9 satisfy the relationships shown in Table 7.

[0180] Conditional / Example 1 2 3 4 5 6 7 8 9 (V5+V6-V7)*(EP56+T67) -6.8156 -6.8156 -7.2363 -6.1093 -6.1093 -6.7798 -5.7470 -5.7470 -5.7470 f567 / (D6m-d5m) -3.8783 -3.8783 -3.8783 -4.6963 -4.6963 -4.6963 -1.3257 -1.3257 -1.3257 (CP6+CT7) / (R14-R13) -4.1975 -4.1975 -4.1975 -4.3466 -4.3466 -4.3466 -3.0540 -3.0540 -3.0540 f7 / (D0m+d0m)*FNO 6.9765 6.9765 6.9765 7.2942 7.2942 7.2942 92.1991 92.1991 92.1991 f6 / (D6s+D5m)*EP56 4.3972 4.3972 4.6790 1.5551 1.5551 1.7444 33.3164 33.3164 33.3164 (f5*R11) / (d5s*d5m) 33.1014 33.1014 33.1014 13.1663 13.1663 13.1663 15.9206 15.9206 15.9206 (f4 / d4s)*(R9 / d4m) 21.8000 21.8000 21.8000 -8.4313 -8.4313 -8.4313 -6.1059 -6.1059 -6.1059 (f5*T45) / (R8*EP45) -0.2356 -0.2356 -0.2356 -0.8893 -0.8893 -0.8893 -0.1013 -0.1013 -0.1013 (T56+T67-EP56)*(N5+N6+N7) -2.8445 -2.8445 -3.0861 -2.1022 -2.1022 -2.4871 -1.4899 -1.4899 -1.4899 (R5+R8) / (D3s-d3m) 5.0874 3.5815 3.5815 4.1378 2.7373 2.8925 2.7137 2.7137 2.8644 f2 / (D2s-d2s) -5.2779 -3.7996 -3.8930 -6.2463 -4.3814 -4.3814 -5.5439 -4.0922 -4.0922 (R3 / EP23+R4 / T23)*(N2-N3) 5.8553 5.8553 5.8553 2.5961 2.5961 2.5961 3.8371 3.8371 3.8371 (f1*d1s+f2*d2s+f3*d3s) / f123 1.7934 1.3300 1.2396 1.1587 1.3020 0.9769 1.0377 1.0377 0.8007 (d1s+D1m)*R3 / R2 13.1457 14.1735 13.9760 10.7493 11.7478 11.6212 10.3458 11.4129 11.2825 (V6-V5)*(d5s+d6m) 51.9852 51.9852 52.7492 49.2373 49.2373 50.1093 51.2985 51.2985 52.1521 CTmax / EPmin 4.4712 4.4712 4.4712 2.9391 2.9391 2.9391 3.4073 3.4073 3.4073 (f1+f2) / (d1m-d2m)*EP12 -5.7957 -10.7347 -21.5398 -6.8485 -6.8485 -7.4827 -7.4604 -7.4604 -8.2854 |f4| / (D4m-D3m) 9.6110 21.2668 21.2668 7.8968 17.4737 17.4737 10.2998 10.2998 10.2998 D1m-d1m 1.5895 3.2211 3.3869 1.7502 2.7973 2.9301 1.7016 2.8487 2.9889 D2m-d2m 2.7157 3.7723 3.6818 2.4824 3.5390 3.5390 2.6966 3.6532 3.6532 D3m-d3m 2.7157 3.8575 3.8575 2.4655 3.7269 3.5269 3.8004 3.8004 3.6004 D4m-d4m 4.5290 4.5290 4.5290 4.5519 4.5519 4.5519 4.6640 4.6640 4.6640 D5m-d5m 3.4343 3.4343 3.4343 3.6288 3.6288 3.6288 3.3469 3.3469 3.3469 D6m-d6m 2.0863 2.0863 1.9073 2.5356 2.5356 2.3313 2.3346 2.3346 2.1346

[0181] Table 7

[0182] Table 8 provides some parameters of the imaging systems in Examples 1 to 9.

[0183]

[0184]

[0185] Table 8

[0186] Table 9 shows the effective focal lengths of the first to seventh lenses of the imaging systems of Embodiments 1 to 9.

[0187] Optical parameters / examples 1 2 3 4 5 6 7 8 9 FNO 1.7245 1.7245 1.7245 1.6900 1.6900 1.6900 1.7834 1.7834 1.7834 f(mm) 7.8365 7.8365 7.8365 8.3302 8.3302 8.3302 8.7003 8.7003 8.7003 f1(mm) 7.8665 7.8665 7.8665 9.6384 9.6384 9.6384 9.1453 9.1453 9.1453 f2 (mm) -14.3331 -14.3331 -14.3331 -15.5058 -15.5058 -15.5058 -14.9497 -14.9497 -14.9497 f3 (mm) 9.3817 9.3817 9.3817 36.8473 36.8473 36.8473 -100.0000 -100.0000 -100.0000 f4 (mm) -20.0227 -20.0227 -20.0227 16.4515 16.4515 16.4515 9.6973 9.6973 9.6973 f5 (mm) -26.2308 -26.2308 -26.2308 -19.6033 -19.6033 -19.6033 -20.3817 -20.3817 -20.3817 f6 (mm) 99.3621 99.3621 99.3621 41.8946 41.8946 41.8946 1000.0000 1000.0000 1000.0000 f7 (mm) 78.2862 78.2862 78.2862 83.0532 83.0532 83.0532 1006.8694 1006.8694 1006.8694

[0188] Table 9

[0189] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging system described above.

[0190] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0191] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0192] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application 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 where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0193] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An imaging system, characterized by, The imaging system has seven pieces of lenses with optical power, comprising: a plurality of lenses, the plurality of lenses comprising first to seventh lenses arranged in sequence from an object side to an image side of the imaging system, the first lens having positive optical power, an object side surface of the first lens being convex, an image side surface of the first lens being concave, the second lens having negative optical power, an object side surface of the second lens being convex, an image side surface of the second lens being concave, at least one of the third lens and the fourth lens having positive optical power, an object side surface of the third lens being convex, an object side surface of the fourth lens being convex, an image side surface of the fourth lens being concave, the fifth lens having negative optical power, an object side surface of the fifth lens being concave, the sixth lens having positive optical power, an object side surface of the sixth lens being concave, an image side surface of the sixth lens being convex, the seventh lens having positive optical power, an object side surface of the seventh lens being convex, an image side surface of the seventh lens being concave; a plurality of spacer elements, the fifth spacer element being located on an image side of the fifth lens and at least partially in contact with an image side surface of the fifth lens, the sixth spacer element being located on an image side of the sixth lens and at least partially in contact with an image side surface of the sixth lens; a lens barrel, the plurality of lenses and the plurality of spacer elements being accommodated in the lens barrel; wherein an F number FNO of the imaging system satisfies: 1.6900≤FNO≤1.7834; an Abbe number V5 of the fifth lens, an Abbe number V6 of the sixth lens, an Abbe number V7 of the seventh lens, an on-axis distance EP56 of the fifth spacer element to the sixth spacer element, and an air separation T67 of the sixth lens and the seventh lens on an optical axis of the imaging system satisfy: -7.2363mm≤(V5+V6-V7)*(EP56+T67)≤-5.7470mm; a combined focal length f567 of the fifth lens, the sixth lens and the seventh lens, an outer diameter D6m of an image side surface of the sixth spacer element, and an inner diameter d5m of an image side surface of the fifth lens satisfy: -4.6963≤f567 / (D6m-d5m)≤-1.3257.

2. The imaging system of claim 1, wherein, a thickness CP6 of the sixth spacer element, a central thickness CT7 of the seventh lens on the optical axis, a curvature radius R13 of an object side surface of the seventh lens, and a curvature radius R14 of an image side surface of the seventh lens satisfy: -4.3466≤(CP6+CT7) / (R14-R13)≤-3.0540.

3. The imaging system of claim 1, wherein, an effective focal length f7 of the seventh lens, an outer diameter D0m of an image side surface of the lens barrel, an inner diameter d0m of the image side surface of the lens barrel, and an F number FNO of the imaging system satisfy: 6.9765≤f7 / (D0m+d0m)*FNO≤92.1991.

4. The imaging system of claim 1, wherein, An effective focal length f6 of the sixth lens, an outer diameter D6s of an object side surface of the sixth spacer element, an outer diameter D5m of an image side surface of the fifth spacer element, and an on-axis distance EP56 of the fifth spacer element to the sixth spacer element satisfy: 1.5551 mm ≤ f6 / (D6s+D5m)*EP56 ≤ 33.3164 mm.

5. The imaging system of claim 1, wherein, An effective focal length f4 of the fourth lens, an inner diameter d4s of an object side surface of the fourth spacer element, a radius of curvature R9 of an object side surface of the fifth lens, and an inner diameter d4m of an image side surface of the fourth spacer element satisfy: -8.4313 ≤ (f4 / d4s)*(R9 / d4m) ≤ 21.8000.

6. The imaging system of claim 1, wherein, An effective focal length f5 of the fifth lens, a radius of curvature R11 of an object side surface of the sixth lens, an inner diameter d5s of an object side surface of the fifth spacer element, and an inner diameter d5m of an image side surface of the fifth spacer element satisfy: 13.1663 ≤ (f5*R11) / (d5s*d5m) ≤ 33.1014.

7. The imaging system of claim 1, wherein, An effective focal length f5 of the fifth lens, an air separation T45 of the fourth lens and the fifth lens on the optical axis, a radius of curvature R8 of an image side surface of the fourth lens, and an on-axis distance EP45 of the fourth spacer element to the fifth spacer element satisfy: -0.8893 ≤ (f5*T45) / (R8*EP45) ≤ -0.1013.

8. The imaging system of claim 1, wherein, A radius of curvature R5 of an object side surface of the third lens, a radius of curvature R8 of an image side surface of the fourth lens, an outer diameter D3s of an object side surface of the third spacer element, and an inner diameter d3m of an image side surface of the third spacer element satisfy: 2.7137 ≤ (R5+R8) / (D3s-d3m) ≤ 5.0874.

9. The imaging system of claim 1, wherein, An air separation T56 of the fifth lens and the sixth lens on the optical axis, an air separation T67 of the sixth lens and the seventh lens on the optical axis, an on-axis distance EP56 of the fifth spacer element to the sixth spacer element, a refractive index N5 of the fifth lens, a refractive index N6 of the sixth lens, and a refractive index N7 of the seventh lens satisfy: -3.0861 mm ≤ (T56+T67-EP56)*(N5+N6+N7) ≤ -1.4899 mm.

10. The imaging system of any one of claims 1 to 9, wherein, The second spacer element and the third spacer element are located on the image side of the second lens and at least partially contact the image side surface of the second lens, and the radius of curvature R3 of the object side surface of the second lens, the axial distance EP23 from the second spacer element to the third spacer element, the radius of curvature R4 of the image side surface of the second lens, the air separation T23 of the second lens and the third lens on the optical axis, the refractive index N2 of the second lens, and the refractive index N3 of the third lens satisfy: 2.5961≤(R3 / EP23+R4 / T23)*(N2-N3)≤5.8553.

11. The imaging system of any one of claims 1 to 9, wherein, The first spacer element, the second spacer element, and the third spacer element are located on the image side of the first lens, the image side of the second lens, and the image side of the third lens, respectively, and at least partially contact the image side surface of the first lens, the image side surface of the second lens, and the image side surface of the third lens, respectively, and the effective focal length f1 of the first lens, the inner diameter d1s of the object side surface of the first spacer element, the effective focal length f2 of the second lens, the inner diameter d2s of the object side surface of the second spacer element, the effective focal length f3 of the third lens, the inner diameter d3s of the object side surface of the third spacer element, and the combined focal length f123 of the first lens, the second lens, and the third lens satisfy: 0.8007mm≤(f1*d1s+f2*d2s+f3*d3s) / f123≤1.7934mm.

12. The imaging system of any one of claims 1 to 9, wherein, The first spacer element is located on the image side of the first lens and at least partially contacts the image side surface of the first lens, and the inner diameter d1s of the object side surface of the first spacer element, the outer diameter D1m of the image side surface of the first spacer element, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R2 of the image side surface of the first lens satisfy: 10.3458mm≤(d1s+D1m)*R3 / R2≤14.1735mm.

13. The imaging system of any one of claims 1 to 9, wherein, The Abbe numbers of the fifth lens and the sixth lens are both less than 30, the Abbe number V6 of the sixth lens, the Abbe number V5 of the fifth lens, the inner diameter d5s of the object side surface of the fifth spacer element, and the inner diameter d6m of the image side surface of the sixth spacer element satisfy: 49.2373mm≤(V6-V5)*(d5s+d6m)≤52.7492mm.

14. The imaging system of any one of claims 1 to 9, wherein, The maximum value CTmax of the center thickness of the first lens to the seventh lens on the optical axis and the minimum value EPmin of the axial distance of the adjacent two spacer elements satisfy: 2.9391≤CTmax / EPmin≤4.4712.

15. The imaging system of any one of claims 1 to 9, wherein, The first spacer element is located on the image side of the first lens and at least partially contacts the image side surface of the first lens, and the second spacer element is located on the image side of the second lens and at least partially contacts the image side surface of the second lens, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d1m of the image side surface of the first spacer element, the inner diameter d2m of the image side surface of the second spacer element, and the axial distance EP12 between the first spacer element and the second spacer element satisfy: -21.5398 <= (f1+f2) / (d1m-d2m)*EP12 <= -5.7957.

16. The imaging system of any one of claims 1 to 9, wherein, The i-th spacer element is located on the image side of the i-th lens and at least partially contacts the image side surface of the i-th lens, i is 1, 2, 3, 4, 5, or 6, the outer diameter D4m of the image side surface of the fourth spacer element, the inner diameter d4m of the image side surface of the fourth spacer element, the outer diameter Djm of the image side surface of the j-th spacer element, and the inner diameter djm of the image side surface of the j-th spacer element satisfy: D4m-d4m>Djm-djm, where j is 1, 2, 3, 5, or 6.

17. The imaging system of any one of claims 1 to 9, wherein, The third spacer element is located on the image side of the third lens and at least partially contacts the image side surface of the third lens, and the fourth spacer element is located on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens, the effective focal length f4 of the fourth lens, the outer diameter D4m of the image side surface of the fourth spacer element, and the outer diameter D3m of the image side surface of the third spacer element satisfy: 7.8968 <= |f4| / (D4m-D3m) <= 21.2668.

Images