Optical imaging lens

Abstract

The application provides an optical imaging lens, which comprises a lens barrel, a lens group and a spacer group, the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, and the air interval T34 of the third lens and the fourth lens on the optical axis satisfy the following relationship: (CT3+CT4+T34) / L<0.5; the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the air interval T34 of the third lens and the fourth lens on the optical axis, and the interval distance EP34 of the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis direction satisfy the following relationship: -90.0<(f3-f4) / (T34+EP34)<-75.0; the air interval T34 of the third lens and the fourth lens on the optical axis, and the interval distance EP34 of the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis direction satisfy the following relationship: 6.5<EP34 / T34<8.0. The application solves the problem that the existing optical imaging lens is unstable after the middle lens is thinned.

Description

Technical Field

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

[0002] In recent years, with the rapid development of science and technology, smart products have become indispensable tools in people's daily lives. People have increasingly higher demands for the photo quality of smart mobile terminals, which has prompted major mobile phone manufacturers to set increasingly higher specifications for rear main camera lenses. These lenses must not only be small and thin, but also possess high image quality. Therefore, how to improve image quality while ensuring a thin and light camera lens, and reduce assembly risks and appearance interference, is one of the key factors in the actual quality of camera lens products.

[0003] Especially in multi-lens systems, the lenses in the middle are less sensitive than those at the edges. Thinning the middle lens in an optical imaging lens can solve this problem, but thinning the middle lens can easily cause assembly instability.

[0004] In other words, existing optical imaging lenses suffer from instability during assembly due to the thinning of the central lens. Summary of the Invention

[0005] The main objective of this invention is to provide an optical imaging lens to solve the problem of instability caused by thinning of the central lens in existing optical imaging lenses.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical imaging lens is provided, comprising: a lens barrel; a lens group disposed within the lens barrel, the lens group comprising, sequentially from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; a spacer group disposed within the lens barrel, the spacer group comprising a third spacer, a fourth spacer, and a sixth spacer, wherein the third spacer is located between the third lens and the fourth lens and at least partially contacts the third lens, the fourth spacer is located between the fourth lens and the fifth lens and at least partially contacts the fifth lens, and the sixth spacer is at least partially in contact with the image side of the sixth lens; the air gap between the first lens and the seventh lens along the optical axis is smaller than the air gap between any two adjacent lenses. The air gap on the optical axis; the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the air gap T34 between the third and fourth lenses on the optical axis, and the height L of the lens barrel satisfy: (CT3+CT4+T34) / L<0.5; the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the air gap T34 between the third and fourth lenses on the optical axis, and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis satisfy: -90.0<(f3-f4) / (T34+EP34)<-75.0; the air gap T34 between the third and fourth lenses on the optical axis, and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis satisfy: 6.5 <EP34 / T34<8.0。

[0007] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group, the lens group being housed within the lens barrel, the lens group comprising, sequentially from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; and a spacer group, housed within the lens barrel, the spacer group comprising a third spacer, a fourth spacer, and a sixth spacer, wherein the third spacer is located between the third and fourth lenses and at least partially in contact with the third lens, the fourth spacer is located between the fourth and fifth lenses and at least partially in contact with the fifth lens, and the sixth spacer is at least partially in contact with the image side of the sixth lens; the air gap between the first and seventh lenses along the optical axis is less than the air gap between any two adjacent lenses along the optical axis; the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis satisfies the following condition between EP34 < 0.45 mm and CT4 / EP34 < 1.7. The effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy the following relationship: 2.0 <f4 / f<3.0。

[0008] The present application provides an optical imaging lens with a seven-piece lens that is miniaturized and thin. In order to meet the requirement of thinning the optical imaging lens and reducing the size of the optical imaging lens in the axial direction of the optical axis, the third lens and the fourth lens at non-sensitive positions are thinned. The air gap between the third lens and the fourth lens on the optical axis is set to be smaller than the air gap between any other two adjacent lenses on the optical axis, and EP34 is limited to be less than 0.45 mm. This places extremely high requirements on the fourth lens, making it difficult to process and form the fourth lens. At the same time, the bearing force of the fourth lens on the lenses on both sides is insufficient, easily resulting in problems of unstable assembly. By restricting the center thickness of the fourth lens, the effective focal length, the effective focal length of the optical imaging lens, and the distance between the image side of the third spacer and the object side of the fourth spacer along the optical axis direction, it is beneficial to the rational distribution of the optical power of the lens, beneficial to the optical imaging lens to achieve small aberrations, and at the same time beneficial to controlling the ratio of the edge thickness to the middle thickness of the fourth lens, beneficial to the fourth lens having good processability, and ensuring the assembly stability of the fourth lens.

[0009] According to another aspect of the present invention, there is provided an optical imaging lens including a lens barrel and a lens group. The lens group is accommodated in the lens barrel. The lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens from the object side to the image side along the optical axis direction; a spacer group, the spacer group is accommodated in the lens barrel, the spacer group includes a third spacer, a fourth spacer, and a sixth spacer, wherein the third spacer is located between the third lens and the fourth lens and at least partially contacts the third lens, the fourth spacer is located between the fourth lens and the fifth lens and at least partially contacts the fifth lens, and the sixth spacer at least partially contacts the image side of the sixth lens; between the first lens and the seventh lens, the air gap between the third lens and the fourth lens on the optical axis is smaller than the air gap between any other two adjacent lenses on the optical axis; the air gap T34 between the third lens and the fourth lens on the optical axis and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis direction satisfy: 6.5 < EP34 / T34 < 8.0; the effective focal length f4 of the fourth lens and the height L of the lens barrel satisfy: f4 / L < 2.4.

[0010] This application provides a miniaturized and thin seven-element optical imaging lens. To achieve this, the application thins the lens and reduces its size along the optical axis, but the third and fourth lenses in non-sensitive positions are designed with reduced thickness. This results in a smaller air gap between the third and fourth lenses along the optical axis compared to the air gap between any two adjacent lenses, leading to poor image quality and assembly issues. This application addresses these problems by adjusting the relationships between the lengths of the third and fourth lenses, the third and fourth spacers, and the lens barrel. This balances the low-order aberrations generated by the front and rear optical systems, achieving good image quality while reducing system size and maintaining the system's ultra-thinness.

[0011] Furthermore, the spacer assembly also includes a first spacer, which is located between the first lens and the second lens and is at least partially in contact with the first lens. The distance EP01 between the object-side end face of the lens barrel and the object-side side face of the first spacer along the optical axis, the distance EP12 between the image-side side face of the first spacer and the object-side side face of the second spacer along the optical axis, and the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy the following: -1.0 < (EP01 + EP12) / (f1 + f2) < 0.

[0012] Furthermore, the air gap T23 between the second and third lenses on the optical axis, the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis, and the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy the following: -0.5 < (T23 + EP34) / (f2 - f3) < 0.5.

[0013] Furthermore, the spacer assembly also includes a fifth spacer, which is located between the fifth lens and the sixth lens and is at least in partial contact with the fifth lens. The air gap T67 between the sixth and seventh lenses on the optical axis and the distance EP56 between the image-side surface of the fifth spacer and the object-side surface of the sixth spacer along the optical axis satisfy: 1.6 <T67 / EP56<2.5。

[0014] Furthermore, the distance EP34 between the image-side surface of the third spacer and the object-side surface of the fourth spacer along the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy the following: EP34 < 0.45 mm, CT4 / EP34 < 1.7; the effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy the following: 2.0 <f4 / f<3.0。

[0015] Furthermore, the effective focal length f4 of the fourth lens and the height L of the lens barrel satisfy the condition: f4 / L<2.4.

[0016] Further, the spacer group further includes a second spacer located between the second lens and the third lens and at least partially contacting the second lens. The interval distance EP23 along the optical axis direction between the image side surface of the second spacer and the object side surface of the third spacer, and the combined focal length f23 of the second lens and the third lens satisfy: -32.0 < f23 / EP23 < -20.0.

[0017] Further, the spacer group further includes a first spacer and a second spacer. The first spacer is located between the first lens and the second lens and at least partially contacts the first lens. The second spacer is located between the second lens and the third lens and at least partially contacts the second lens. The refractive index N1 of the first lens, the refractive index N2 of the second lens, the interval distance EP12 along the optical axis direction between the image side surface of the first spacer and the object side surface of the second spacer, and the effective focal length f1 of the first lens satisfy: (N1 + N2) EP12 / |f1| < 0.8.

[0018] Further, the effective focal length f of the optical imaging lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0 < R6 / f; the radius of curvature R6 of the image side surface of the third lens, the inner diameter d3m of the image side surface of the third spacer, and the effective focal length f3 of the third lens satisfy: -10.0 mm < d3m / (R6 / f3) < -5.0 mm.

[0019] Further, the refractive index N4 of the fourth lens, the central thickness CT4 of the fourth lens on the optical axis, and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0 < N4 CT4 / R7 < 0.5; the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 2.5 < f4 / d4s < 5.0.

[0020] Further, the spacer group further includes a first spacer and a second spacer. The first spacer is located between the first lens and the second lens and at least partially contacts the first lens. The second spacer is located between the second lens and the third lens and at least partially contacts the second lens. The radius of curvature R2 of the image side surface of the first lens and the radius of curvature R3 of the object side surface of the second lens satisfy: 1.0 < R2 / R3 < 1.5; the inner diameter d1m of the image side surface of the first spacer and the inner diameter d2m of the image side surface of the second spacer satisfy: 1.01 < d1m / d2m < 1.20.

[0021] Furthermore, the spacer group further includes a fifth spacer. The fifth spacer is located between the fifth lens and the sixth lens and is at least partially in contact with the fifth lens. The axial spacing distance EP56 between the image side surface of the fifth spacer and the object side surface of the sixth spacer, the maximum thickness CP6 of the sixth spacer in the axial direction, and the air spacing T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.90 < (EP56 + CP6) / T67 < 1.30.

[0022] Furthermore, the inner diameter d0s of the object side end face of the lens barrel, the inner diameter d0m of the image side end face of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field angle Semi-FOV of the optical imaging lens satisfy: 1.0 < (d0m - d0s) / [f tan(Semi-FOV)] < 1.5.

[0023] Furthermore, the spacer group further includes a sixth auxiliary spacer. The sixth auxiliary spacer is located between the sixth spacer and the seventh lens. The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -2.0 < f6 / f7 < 0; the outer diameter D6m of the image side surface of the sixth spacer, the outer diameter D6bs of the object side surface of the sixth auxiliary spacer, and the inner diameter d6bs of the object side surface of the sixth auxiliary spacer satisfy: 3.0 < D6m / (D6bs - d6bs) < 5.0.

[0024] Furthermore, the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens and the height L of the lens barrel satisfy: 0.1 < f456 / L < 1.0.

[0025] Furthermore, the maximum effective radius DT42 of the image side surface of the fourth lens, the maximum effective radius DT51 of the object side surface of the fifth lens, and the outer diameter D4s of the object side surface of the fourth spacer satisfy: 0.2 < (DT42 + DT51) / D4s < 0.7.

[0026] According to the technical solution of the present invention, an optical imaging lens includes a lens barrel and a lens group. The lens group is housed within the lens barrel and includes, sequentially from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. A spacer group is also housed within the lens barrel and includes a third spacer, a fourth spacer, and a sixth spacer. The third spacer is located between the third and fourth lenses and is at least partially in contact with the third lens. The fourth spacer is located between the fourth and fifth lenses and is at least partially in contact with the fifth lens. The sixth spacer is at least partially in contact with the image side of the sixth lens. Between the first to the seventh lenses, the air gap between the third and fourth lenses on the optical axis is smaller than the air gap between any two adjacent lenses on the optical axis. The central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the air gap T34 between the third and fourth lenses on the optical axis, and the height L of the lens barrel satisfy the following condition: (CT3+CT4+T34) / L<0.5; the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the air gap T34 between the third and fourth lenses on the optical axis, and the distance EP34 between the image-side surface of the third spacer and the object-side surface of the fourth spacer along the optical axis satisfy the following condition: -90.0<(f3-f4) / (T34+EP34)<-75.0; the air gap T34 between the third and fourth lenses on the optical axis and the distance EP34 between the image-side surface of the third spacer and the object-side surface of the fourth spacer along the optical axis satisfy the following condition: 6.5. <EP34 / T34<8.0。

[0027] This application provides a miniaturized and thin seven-element optical imaging lens. To achieve this, the application thins the third and fourth lenses in non-sensitive positions, limiting their thickness and the air gap between them to (CT3+CT4+T34) / L<0.5. However, the air gap between the third and fourth lenses on the optical axis is smaller than that between any two adjacent lenses, leading to poor image quality and assembly issues. This application addresses this by designing the focal lengths of the third and fourth lenses, the air gap, and the relationship between the third and fourth spacers. This balances low-order aberrations generated by the front and rear optical systems, resulting in good image quality. Furthermore, it allows for reasonable control of the ratio of the thickness of the third spacer to the center thickness of the lens, preventing interference between the assembled thick lens and the effective diameter of the lens on the optical axis, thus avoiding lens appearance and performance problems. Attached Figure Description

[0028] 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:

[0029] Figure 1 A schematic diagram of the structure of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0030] Figure 2 A schematic diagram of the structure of the optical imaging lens according to Embodiment 1 of the present invention is shown;

[0031] 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.

[0032] Figure 7 A schematic diagram of the structure of the optical imaging lens according to Embodiment 2 of the present invention is shown;

[0033] Figure 8 A schematic diagram of the optical imaging lens according to Embodiment 3 of the present invention is shown;

[0034] Figures 9 to 12 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Embodiment 3 of the present invention are shown respectively.

[0035] Figure 13 A schematic diagram of the structure of the optical imaging lens according to Embodiment 4 of the present invention is shown;

[0036] Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiment 5 of the present invention is shown;

[0037] Figures 15 to 18 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.

[0038] Figure 19 A schematic diagram of the structure of the optical imaging lens according to Embodiment 2 of the present invention is shown;

[0039] Figure 20 A schematic diagram of the structure of the optical imaging lens according to Embodiment 1 of the present invention is shown;

[0040] Figures 21 to 24 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.

[0041] Figure 25 A schematic diagram of the structure of the optical imaging lens according to Embodiment 2 of the present invention is shown;

[0042] Figure 26The diagram shows the stress distribution cloud map of an optical imaging lens according to an optional embodiment of the present invention when an axial assembly force of 5N is applied.

[0043] Figure 27 The diagram shows a stress distribution cloud of an optical imaging lens according to an optional embodiment of the present invention when an axial assembly force of 10N is applied.

[0044] Figure 28 The stress distribution cloud map of the optical imaging lens of the prior art solution 1 is shown when a 5N assembly force is applied axially.

[0045] Figure 29 The stress distribution cloud map of the optical imaging lens of the prior art solution 1 is shown when a 10N assembly force is applied axially.

[0046] Figure 30 The stress distribution cloud map of the optical imaging lens of the prior art solution 2 is shown when a 5N assembly force is applied axially.

[0047] Figure 31 The stress distribution cloud map of the optical imaging lens of the prior art solution 2 is shown when a 10N assembly force is applied axially.

[0048] The above figures include the following reference numerals:

[0049] E1, First lens; P1, First spacer; E2, Second lens; P2, Second spacer; E3, Third lens; P3, Third spacer; E4, Fourth lens; P4, Fourth spacer; E5, Fifth lens; P5, Fifth spacer; E6, Sixth lens; P6, Sixth spacer; P6b, Sixth auxiliary spacer; E7, Seventh lens. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0056] To address the problem of instability caused by thinning the central lens in existing optical imaging lenses, this invention provides an optical imaging lens.

[0057] First Implementation Method

[0058] like Figures 1 to 27As shown, the optical imaging lens includes a lens barrel and a lens group. The lens group is housed within the lens barrel and includes, sequentially from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. A spacer group is also housed within the lens barrel and includes a third spacer, a fourth spacer, and a sixth spacer. The third spacer is located between the third and fourth lenses and is in at least partial contact with the third lens. The fourth spacer is located between the fourth and fifth lenses and is in at least partial contact with the fifth lens. The sixth spacer is in at least partial contact with the image side of the sixth lens. The air gap between the third and fourth lenses along the optical axis is smaller than the air gap between any two adjacent lenses along the optical axis. The following conditions must be met between the center thickness CT3 on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the air gap T34 between the third and fourth lenses on the optical axis, and the height L of the lens barrel: (CT3+CT4+T34) / L<0.5; the following conditions must be met between the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the air gap T34 between the third and fourth lenses on the optical axis, and the distance EP34 between the image-side surface of the third spacer and the object-side surface of the fourth spacer along the optical axis: -90.0<(f3-f4) / (T34+EP34)<-75.0; and the following conditions must be met between the air gap T34 between the third and fourth lenses on the optical axis and the distance EP34 between the image-side surface of the third spacer and the object-side surface of the fourth spacer along the optical axis: 6.5. <EP34 / T34<8.0。

[0059] This application provides a miniaturized and thin seven-element optical imaging lens. To achieve this, the application thins the third and fourth lenses in non-sensitive positions, limiting their thickness and the air gap between them to (CT3+CT4+T34) / L<0.5. However, the air gap between the third and fourth lenses on the optical axis is smaller than that between any two adjacent lenses, leading to poor image quality and assembly issues. This application addresses this by designing the focal lengths of the third and fourth lenses, the air gap, and the relationship between the third and fourth spacers. This balances low-order aberrations generated by the front and rear optical systems, resulting in good image quality. Furthermore, it allows for reasonable control of the ratio of the thickness of the third spacer to the center thickness of the lens, ensuring minimal stress distribution at the third and fourth lens positions. This prevents interference between the assembled thick lens and the effective diameter of the lens on the optical axis, avoiding lens appearance and performance problems.

[0060] The first prior art solution shown in Table 12 is a structure in the prior art where EP34 / T34 is less than 6.5. When assembling forces of 5N and 10N are applied axially, the average stresses borne by the edge part of the sensitive lens are 0.90733N and 1.26185N respectively. The stress distribution diagrams when assembling forces of 5N and 10N are applied axially are as shown in Figure 28 and Figure 29 shown.

[0061] The first prior art solution shown in Table 12 is a structure in the prior art where EP34 / T34 is less than 8.0. When assembling forces of 5N and 10N are applied axially, the average stresses borne by the edge part of the sensitive lens are 0.382019N and 1.13198N respectively. The stress distribution diagrams when assembling forces of 5N and 10N are applied axially are as shown in Figure 30 and Figure 31 shown.

[0062] The solution of the present application shown in Table 12 is for an optical imaging lens with a structure satisfying 6.5 < EP34 / T34 < 8.0. When assembling forces of 5N and 10N are applied axially, the average stresses borne by the edge part of the sensitive lens are 0.000242N and 0.001249N respectively. The stress distribution diagrams when assembling forces of 5N and 10N are applied axially are as shown in Figure 26 and Figure 27 shown. Compared with the first prior art solution and the second prior art solution, it can be seen from the figure that when assembling, different forces are applied, and the stress distribution at the positions of the third lens and the fourth lens of the optical imaging lens in the solution of the present application is relatively uniform, without obvious deformation, and no interference occurs between the lenses.

[0063] Preferably, 0.1 < (CT3 + CT4 + T34) / L < 0.25.

[0064] Preferably, -88 < (f3 - f4) / (T34 + EP34) < -76.

[0065] Preferably, 6.55 < EP34 / T34 < 7.9.

[0066] In this embodiment, the spacer group further includes a first spacer located between the first lens and the second lens and at least partially contacting the first lens. The spacing distance EP01 along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer, the spacing distance EP12 along the optical axis between the image-side surface of the first spacer and the object-side surface of the second spacer, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -1.0 < (EP01 + EP12) / (f1 + f2) < 0. By reasonably controlling this conditional expression, it is beneficial to the processing and forming requirements of the first lens and the second lens, beneficial to controlling the edge thickness of the first lens, reducing the forming difficulty of the first lens, and at the same time improving the influence of the first lens and the second lens on the aberration of the optical imaging lens and improving the low-order aberration of the optical imaging lens. Preferably, -0.5 < (EP01 + EP12) / (f1 + f2) < 0.

[0067] In this embodiment, the air spacing T23 between the second lens and the third lens on the optical axis, the spacing distance EP34 along the optical axis between the image-side surface of the third spacer and the object-side surface of the fourth spacer, and the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -0.5 < (T23 + EP34) / (f2 - f3) < 0.5. By controlling this conditional expression, it helps to control the edge thickness of the third lens and is beneficial to ensuring the normal imaging of the optical imaging lens. Preferably, -0.3 < (T23 + EP34) / (f2 - f3) < 0.3.

[0068] In this embodiment, the spacer group further includes a fifth spacer located between the fifth lens and the sixth lens and at least partially contacting the fifth lens. The air spacing T67 between the sixth lens and the seventh lens on the optical axis and the spacing distance EP56 along the optical axis between the image-side surface of the fifth spacer and the object-side surface of the sixth spacer satisfy: 1.6 < T67 / EP56 < 2.5. By controlling this conditional expression, it is possible to prevent the effective diameter surfaces of the sixth lens and the seventh lens from interfering in the optical axis direction after assembly, avoiding lens appearance problems and performance abnormality problems; at the same time, it helps to ensure the thickness and position of the fifth spacer and the sixth spacer, so as to effectively adjust the field curvature by adjusting the thickness of the spacers at sensitive positions and improve the performance yield. Preferably, 1.62 < T67 / EP56 < 2.49.

[0069] In this embodiment, the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis direction and the central thickness CT4 of the fourth lens on the optical axis satisfy: EP34 < 0.45 mm, CT4 / EP34 < 1.7; the effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy: 2.0 < f4 / f < 3.0. The edge thickness of the fourth lens is small, which easily leads to difficulty in processing the fourth lens. Such a setting is beneficial to ensuring the rationality of the optical power distribution of the lens, facilitating the optical imaging lens to achieve small aberration, and reasonably controlling the ratio of the edge thickness to the central thickness of the fourth lens is beneficial to the fourth lens having good processability. Preferably, 1.4 < CT4 / EP34 < 1.7.

[0070] In this embodiment, the effective focal length f4 of the fourth lens and the height L of the lens barrel satisfy: f4 / L < 2.4. By controlling the effective focal length of the fourth lens, the optical power distribution of each lens can be ensured to be reasonable, which is beneficial to the realization of small aberration of the optical imaging lens; by controlling the ratio between the effective focal length of the fourth lens and the height of the lens barrel, it is beneficial to reduce the size of the system and maintain the ultra-thinness of the system. Preferably, 1.5 < f4 / L < 2.4.

[0071] In this embodiment, the spacer group further includes a second spacer. The second spacer is located between the second lens and the third lens and at least partially contacts the second lens. The distance EP23 between the image side of the second spacer and the object side of the third spacer along the optical axis direction and the combined focal length f23 of the second lens and the third lens satisfy: -32.0 < f23 / EP23 < -20.0. By controlling this conditional expression, it helps to control the edge thickness of the third lens, reduce the difficulty of forming the third lens, reasonably control the combined focal length of the second lens and the third lens, and is beneficial to reducing the spherical aberration contribution of the first lens and realizing the correction of the aberration of the optical imaging lens. Preferably, -31.0 < f23 / EP23 < -20.0.

[0072] In this embodiment, the spacer group further includes a first spacer and a second spacer. The first spacer is located between the first lens and the second lens and at least partially contacts the first lens. The second spacer is located between the second lens and the third lens and at least partially contacts the second lens. The refractive index N1 of the first lens, the refractive index N2 of the second lens, the distance EP12 between the image side of the first spacer and the object side of the second spacer along the optical axis direction, and the effective focal length f1 of the first lens satisfy: (N1 + N2) EP12 / |f1| < 0.8. By controlling the combination of the refractive indices of the first lens and the second lens, as well as the ratio between the distance between the image side of the first spacer and the object side of the second spacer along the optical axis direction and the effective focal length of the first lens within a reasonable range, it is beneficial to improve the lateral axial chromatic aberration and spherical aberration in the optical system. Preferably, 0 < (N1 + N2) EP12 / |f1| < 0.4.

[0073] In this embodiment, the effective focal length f of the optical imaging lens and the radius of curvature R6 of the image side of the third lens satisfy: 0 < R6 / f; the radius of curvature R6 of the image side of the third lens, the inner diameter d3m of the image side of the third spacer, and the effective focal length f3 of the third lens satisfy: -10.0 mm < d3m / (R6 / f3) < -5.0 mm. Reasonably controlling the ratio of the radius of curvature of the image side of the third lens to the effective focal length of the optical imaging lens is beneficial to controlling the contribution of spherical aberration of the third lens. By controlling the inner diameter of the image side of the third spacer, it is beneficial to improving the internal stray light between the third lens and the fourth lens. Preferably, 0 < R6 / f < 1.8, -10.0 mm < d3m / (R6 / f3) < -8.0 mm.

[0074] In this embodiment, the refractive index N4 of the fourth lens, the central thickness CT4 of the fourth lens on the optical axis, and the radius of curvature R7 of the object side of the fourth lens satisfy: 0 < N4 CT4 / R7 < 0.5; the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side of the fourth spacer satisfy: 2.5 < f4 / d4s < 5.0. By controlling the optical power of the fourth lens, the central thickness and surface shape on the optical axis are beneficial to balancing the aberration generated by the front-end optical system and the rear-end optical system of the system, while making the lens distribution uniform and the thickness reasonable, which is beneficial to processing. Preferably, 0 < N4 CT4 / R7 < 0.05, 2.5 < f4 / d4s < 4.5.

[0075] In this embodiment, the spacer group further includes a first spacer and a second spacer. The first spacer is located between the first lens and the second lens and is at least partially in contact with the first lens. The second spacer is located between the second lens and the third lens and is at least partially in contact with the second lens. The following conditions are satisfied between the radius of curvature R2 of the image side surface of the first lens and the radius of curvature R3 of the object side surface of the second lens: 1.0 < R2 / R3 < 1.5; the following conditions are satisfied between the inner diameter d1m of the image side surface of the first spacer and the inner diameter d2m of the image side surface of the second spacer: 1.01 < d1m / d2m < 1.20. Reasonably controlling this conditional expression is beneficial to improving the axial chromatic aberration of the optical imaging lens and the shape of the lens, enhancing the processability of the first lens processing, reducing the stray light caused by the positions of the first lens and the second lens to the optical imaging lens, and improving the imaging quality. Preferably, 1.0 < R2 / R3 < 1.3; 1.01 < d1m / d2m < 1.15.

[0076] In this embodiment, the spacer group further includes a fifth spacer. The fifth spacer is located between the fifth lens and the sixth lens and is at least partially in contact with the fifth lens. The following conditions are satisfied among the spacing distance EP56 along the optical axis direction between the image side surface of the fifth spacer and the object side surface of the sixth spacer, the maximum thickness CP6 of the sixth spacer along the optical axis direction, and the air spacing T67 between the sixth lens and the seventh lens on the optical axis: 0.90 < (EP56 + CP6) / T67 < 1.30. Reasonably controlling the edge thickness and the center thickness of the fifth lens can ensure that the fifth lens has good processing feasibility, and effectively ensure the accuracy of the lens-to-lens bearing position after assembly, so that the parameters of the optical imaging lens meet the design requirements. By controlling the air spacing between the sixth lens and the seventh lens on the optical axis, it is beneficial to improving the consistency of the field curvature of the optical imaging lens. Preferably, 0.90 < (EP56 + CP6) / T67 < 1.28.

[0077] In this embodiment, the following conditions are satisfied among the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field angle Semi-FOV of the optical imaging lens: 1.0 < (d0m - d0s) / [f tan(Semi-FOV)] < 1.5. By controlling the relationship between the inner diameter of the object side end surface of the lens barrel, the inner diameter of the image side end surface of the lens barrel, and the image surface size, the large image surface requirement of the optical imaging lens can be ensured, which is beneficial to ensuring that the optical imaging lens meets normal shooting. At the same time, under the condition that the optical effective aperture is fixed, the better the thickness uniformity of the lens barrel wall, the more stable the reliability of the optical imaging lens. Preferably, 1.0 < (d0m - d0s) / [f tan(Semi-FOV)] < 1.3.

[0078] In this embodiment, the spacer group further includes a sixth auxiliary spacer located between the sixth spacer and the seventh lens. The ratio between the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfies: -2.0 < f6 / f7 < 0. The ratio between the outer diameter D6m of the image side of the sixth spacer, the outer diameter D6bs of the object side of the sixth auxiliary spacer, and the inner diameter d6bs of the object side of the sixth auxiliary spacer satisfies: 3.0 < D6m / (D6bs - d6bs) < 5.0. Reasonably controlling the ratio between the effective focal length of the sixth lens and the effective focal length of the seventh lens is beneficial to adjusting the field curvature of the optical imaging lens. By controlling the relationship between the outer diameter of the image side of the sixth spacer and the inner and outer diameters of the object side of the sixth auxiliary spacer, the stability of the bearing position between the sixth lens and the seventh lens can be effectively ensured, which is beneficial to improving the overall assembly yield of the optical imaging lens. Preferably, -1.5 < f6 / f7 < -0.3; 3.0 < D6m / (D6bs - d6bs) < 4.8.

[0079] In this embodiment, the ratio between the combined focal length f456 of the fourth, fifth, and sixth lenses and the height L of the lens barrel satisfies: 0.1 < f456 / L < 1.0. Controlling the ratio between the combined focal length of the fourth to sixth lenses of the optical imaging lens and the height of the lens barrel within a reasonable range can ensure a reasonable distribution of the optical power of the fourth to sixth lenses, which is beneficial to the realization of small aberration of the optical imaging lens. At the same time, it is also beneficial to reduce the height of the lens barrel and achieve the thin and light of the optical imaging lens. Preferably, 0.5 < f456 / L < 1.0.

[0080] In this embodiment, the ratio between the maximum effective radius DT42 of the image side of the fourth lens, the maximum effective radius DT51 of the object side of the fifth lens, and the outer diameter D4s of the object side of the fourth spacer satisfies: 0.2 < (DT42 + DT51) / D4s < 0.7. Reasonably controlling the ratio between the maximum effective radius of the image side of the fourth lens, the maximum effective radius of the object side of the fifth lens, and the outer diameter of the object side of the fourth spacer can effectively block the excess light at the edges of the fourth and fifth lenses and avoid the generation of stray light. Preferably, 0.3 < (DT42 + DT51) / D4s < 0.6.

[0081] Second Embodiment

[0082] As Figures 1 to 27As shown, the optical imaging lens includes a lens barrel and a lens group. The lens group is housed within the lens barrel and includes, sequentially from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. A spacer group is also housed within the lens barrel and includes a third spacer, a fourth spacer, and a sixth spacer. The third spacer is located between the third and fourth lenses and is in at least partial contact with the third lens. The fourth spacer is located between the fourth and fifth lenses and is in at least partial contact with the fifth lens. The sixth spacer is in at least partial contact with the image side of the sixth lens. The air gap between the third and fourth lenses along the optical axis is smaller than the air gap between any two adjacent lenses. The distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis satisfies the following condition: EP34 < 0.45 mm, CT4 / EP34 < 1.7. The effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy the following relationship: 2.0 <f4 / f<3.0。

[0083] This application provides a miniaturized and thin seven-element optical imaging lens. To achieve this, the application thins the third and fourth lenses in non-sensitive positions, reducing their dimensions along the optical axis. The air gap between the third and fourth lenses on the optical axis is set smaller than the air gap between any two adjacent lenses, and the EP34 is limited to less than 0.45 mm. This places extremely high demands on the fourth lens, making it difficult to manufacture and causing insufficient support for the lenses on either side, leading to assembly instability. This application addresses this by limiting the center thickness of the fourth lens, its effective focal length, the effective focal length of the optical imaging lens, and the distance between the image-side and object-side surfaces of the third and fourth spacers along the optical axis. This improves the rationality of the lens's power distribution, facilitates smaller aberrations in the optical imaging lens, helps control the ratio of the edge thickness to the center thickness of the fourth lens, enhances its manufacturability, and ensures assembly stability.

[0084] Preferably, 1.4 <CT4 / EP34<1.7。

[0085] Third Implementation Method

[0086] like Figures 1 to 27As shown in the figure, the optical imaging lens includes a lens barrel and a lens group. The lens group is accommodated in the lens barrel. Along the optical axis direction from the object side to the image side, the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; a spacer group, which is accommodated in the lens barrel. The spacer group includes a third spacer, a fourth spacer, and a sixth spacer. The third spacer is located between the third lens and the fourth lens and is at least partially in contact with the third lens. The fourth spacer is located between the fourth lens and the fifth lens and is at least partially in contact with the fifth lens. The sixth spacer is at least partially in contact with the image side surface of the sixth lens; between the first lens and the seventh lens, the air gap on the optical axis between the third lens and the fourth lens is smaller than the air gaps on the optical axis between any other two adjacent lenses; the air gap T34 on the optical axis between the third lens and the fourth lens and the interval distance EP34 along the optical axis direction between the image side surface of the third spacer and the object side surface of the fourth spacer satisfy: 6.5 < EP34 / T34 < 8.0; the effective focal length f4 of the fourth lens and the height L of the lens barrel satisfy: f4 / L < 2.4.

[0087] This application provides an optical imaging lens with a miniaturized and thin seven-piece lens. In order to meet the requirement of making the optical imaging lens thinner and reducing the size of the optical imaging lens in the extending direction of the optical axis, the third lens and the fourth lens at non-sensitive positions are thinned. The air gap on the optical axis between the third lens and the fourth lens is set to be smaller than the air gaps on the optical axis between any other two adjacent lenses, which may easily lead to problems such as poor imaging quality and appearance assembly of the optical imaging lens. However, through the relationship between the third lens, the fourth lens, the third spacer and the fourth spacer, and the length of the lens barrel, this application balances the low-order aberrations generated by the front-stage optical system and the rear-stage optical system, enabling the optical imaging lens to have good imaging quality while reducing the size of the system and maintaining the ultrathin nature of the system.

[0088] Preferably, 6.55 < EP34 / T34 < 7.9.

[0089] Preferably, 1.5 < f4 / L < 2.4.

[0090] Optionally, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The optical imaging lens in this application can use multiple lenses, such as the above seven pieces. By reasonably allocating the effective focal length, surface shape, central thickness of each lens, and the axial distance between each lens, etc., the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the optical imaging lens more conducive to production and processing and applicable to portable electronic devices such as smartphones.

[0091] Preferably, the optical imaging lens in this application is suitable for infrared imaging.

[0092] In this application, at least one of the mirror surfaces of each lens is 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 improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0093] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although seven lenses are described as an example in the embodiments, the optical imaging lens is not limited to including seven lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0094] Figure 1 A schematic diagram of the structure of an optical imaging lens of this application is shown. Figure 1 The accompanying drawings also indicate parameters such as d0m, d1s, and D2m to provide a clear and intuitive understanding of their meaning. To facilitate the demonstration of the optical imaging lens structure and specific surface shape, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0095] Where Dis refers to the outer diameter of the object side of the i-th spacer, dis refers to the inner diameter of the object side of the i-th spacer, Dim refers to the outer diameter of the image side of the i-th spacer, dim refers to the inner diameter of the image side of the i-th spacer, CPi refers to the maximum thickness of the i-th spacer, which is also the maximum distance along the optical axis from the object side to the image side of the i-th spacer, and EPij refers to the distance along the optical axis between the image side of the i-th spacer and the object side of the j-th spacer, where i and j are both positive integers greater than or equal to 1. d0s is the inner diameter of the object side end face of the lens barrel, and D0m is the outer diameter of the image side end face of the lens barrel. The maximum height L of the lens barrel P0 refers to the maximum distance along the optical axis from the object side end face to the image side end face of the lens barrel P0.

[0096] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical imaging lenses applicable to the above embodiments.

[0097] It should be noted that any one of the following embodiments, from Embodiment 1 to Embodiment 8, is applicable to all implementation methods of this application.

[0098] Example 1

[0099] like Figures 2 to 6The image shows an optical imaging lens according to an embodiment of this application.

[0100] like Figure 2 As shown, the optical imaging lens includes, in sequence from the object side to the image side, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a sixth auxiliary spacer P6b, and a seventh lens E7.

[0101] 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.

[0102] Table 1 shows the basic structural parameters of the optical imaging lens in Embodiment 1, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0103]

[0104] Table 1

[0105] Table 1 also shows the object side surface S5, the image side surface S16, and the imaging surface S17 of the filter.

[0106] 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:

[0107] Formula (1);

[0108] 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, and A20 that can be used for each aspherical mirror in this embodiment.

[0109]

[0110] Table 2

[0111] Figure 3 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which indicates the focal point deviation of light of different wavelengths after passing through the optical imaging lens. Figure 4 The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The distortion curve of the optical imaging lens of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 6 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0112] according to Figures 3 to 6 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0113] Example 2

[0114] The difference from Embodiment 1 is that the parameters of the lens barrel P0 and the spacer are different.

[0115] like Figure 7 The image shows an optical imaging lens according to Embodiment 2 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0116] In Embodiment 2, the curvature radius, center thickness, and other parameters of the first to seventh lenses of the optical imaging lens are the same as those in Embodiment 1, as are the inter-lens spacing and higher-order image coefficients, as shown in Tables 1 and 2. However, parameters such as the lens barrel P0, the thickness of the spacers, the inner and outer diameters of the spacers, the distance between the spacers, and the edge thickness of the lenses are different. Therefore, the imaging quality of the optical imaging lens in this embodiment is as follows: Figures 3 to 6 As shown.

[0117] Example 3

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

[0119] like Figures 8 to 12 The image shows an optical imaging lens according to Embodiment 3 of this application.

[0120] like Figure 8 As shown, the optical imaging lens includes, in sequence from the object side to the image side, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a sixth auxiliary spacer P6b, and a seventh lens E7.

[0121] Table 3 shows the basic structural parameters of the optical imaging lens in Embodiment 3, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0122]

[0123] Table 3

[0124] Table 4 provides the conic coefficients and higher-order coefficients for each aspherical mirror S4-S14 in Example 3.

[0125]

[0126] Table 4

[0127] Figure 9 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which indicates the focal point deviation of light of different wavelengths after passing through the optical imaging lens. Figure 10 The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 11 The distortion curve of the optical imaging lens of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 12 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0128] according to Figures 9 to 12 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0129] Example 4

[0130] The difference from Embodiment 3 is that the parameters of the lens barrel P0 and the spacer are different.

[0131] like Figure 13 The image shows an optical imaging lens according to Embodiment 4 of this application. For the sake of brevity, descriptions similar to those in Embodiment 3 will be omitted.

[0132] In Embodiment 4 and Embodiment 3, the curvature radius, center thickness, and other parameters of the first to seventh lenses of the optical imaging lens, as well as the spacing between the lenses and the higher-order image coefficients, are the same, as shown in Tables 3 and 4. However, parameters such as the lens barrel P0, the thickness of the spacers, the inner and outer diameters of the spacers, the distance between the spacers, and the edge thickness of the lenses are different. Therefore, the imaging quality of the optical imaging lens in this embodiment is as follows: Figures 9 to 12 As shown.

[0133] Example 5

[0134] The difference from Embodiment 1 is that some parameters of the lens barrel P0, the spacer, and the lens are different.

[0135] like Figures 14 to 18 The image shows an optical imaging lens according to Embodiment 5 of this application.

[0136] like Figure 14 As shown, the optical imaging lens includes, in sequence from the object side to the image side, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a sixth auxiliary spacer P6b, and a seventh lens E7.

[0137] Table 5 shows the basic structural parameters of the optical imaging lens in Embodiment 5, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0138]

[0139] Table 5

[0140] Table 6 provides the conic coefficients and higher-order coefficients for each aspherical mirror S4-S14 in Example 5.

[0141]

[0142] Table 6

[0143] Figure 15 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 5 is shown, which indicates the focal point deviation of light of different wavelengths after passing through the optical imaging lens. Figure 16 The astigmatism curve of the optical imaging lens of Embodiment 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 17 The distortion curve of the optical imaging lens of Embodiment 5 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 18 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 5 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0144] according to Figures 15 to 18 It can be seen that the optical imaging lens given in Example 5 can achieve good imaging quality.

[0145] Example 6

[0146] The difference from Example 5 is that the parameters of the lens barrel P0 and the spacer are different.

[0147] like Figure 19The image shows an optical imaging lens according to Embodiment Six of this application. For the sake of brevity, descriptions similar to those in Embodiment Five will be omitted.

[0148] In Embodiment Six and Embodiment Five, the curvature radius, center thickness, and other parameters of the first to seventh lenses of the optical imaging lens, as well as the spacing between the lenses and the higher-order image coefficients, are the same, as shown in Tables 5 and 6. However, parameters such as the lens barrel P0, the thickness of the spacers, the inner and outer diameters of the spacers, the distance between the spacers, and the edge thickness of the lenses are somewhat different. Therefore, the imaging quality of the optical imaging lens in this embodiment is as follows: Figures 15 to 18 As shown.

[0149] Example 7

[0150] The difference from Embodiment 1 is that some parameters of the lens barrel P0, the spacer, and the lens are different.

[0151] like Figures 20 to 24 The image shows an optical imaging lens according to Embodiment Seven of this application.

[0152] like Figure 20 As shown, the optical imaging lens includes, in sequence from the object side to the image side, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a sixth auxiliary spacer P6b, and a seventh lens E7.

[0153] Table 7 shows the basic structural parameters of the optical imaging lens of Embodiment 7, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0154]

[0155] Table 7

[0156] Table 8 provides the conic coefficients and higher-order coefficients for each aspherical mirror S4-S14 in Example 7.

[0157]

[0158] Table 8

[0159] Figure 21 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 7 is shown, which indicates the focal point deviation of light of different wavelengths after passing through the optical imaging lens. Figure 22 The astigmatism curve of the optical imaging lens of Embodiment 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 23The distortion curve of the optical imaging lens of Embodiment 7 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 24 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 7 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0160] according to Figures 21 to 24 It can be seen that the optical imaging lens given in Example 7 can achieve good imaging quality.

[0161] Example 8

[0162] The difference from Embodiment 7 is that the parameters of the lens barrel P0 and the spacer are different.

[0163] like Figure 25 The image shows an optical imaging lens according to Embodiment 8 of this application. For the sake of brevity, descriptions similar to those in Embodiment 7 will be omitted.

[0164] In Embodiment 8 and Embodiment 7, the parameters such as the radius of curvature, center thickness, inter-lens spacing, and higher-order image coefficients of the optical imaging lens from the first to the seventh lens are the same, as shown in Tables 7 and 8. However, parameters such as the lens barrel P0, the thickness of the spacers, the inner and outer diameters of the spacers, the distance between the spacers, and the edge thickness of the lenses are different. Therefore, the imaging quality of the optical imaging lens in this embodiment is as follows: Figures 21 to 24 As shown.

[0165] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 9.

[0166]

[0167] Table 9

[0168] Table 10 provides some parameters of the optical imaging lenses for Examples 1 to 8.

[0169]

[0170] Table 10

[0171] Table 11 shows the effective focal lengths of the first to seventh lenses of the optical imaging lenses in Embodiments 1 to 9.

[0172]

[0173] Table 11

[0174] Table 12 provides a comparison between optical imaging lenses in the prior art and the optical imaging lens of this application.

[0175]

[0176] Table 12

[0177] This application also provides an imaging device, whose 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 optical imaging lens described above.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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 optical imaging lens, characterized in that, include: Lens tube; A lens group, housed within the lens barrel, comprises seven lenses of varying optical power. Along the optical axis, from the object side to the image side, the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has positive optical power, with a convex object side and a concave image side. The second lens has negative optical power, with a convex object side and a concave image side. The third lens has negative optical power... The third lens has a convex object-side surface and a concave image-side surface; the fourth lens has positive optical power, and both its object-side and image-side surfaces are convex; the fifth lens has negative optical power, and both its object-side and image-side surfaces are convex; the sixth lens has positive optical power, and both its object-side and image-side surfaces are convex; the seventh lens has negative optical power, and both its object-side and image-side surfaces are convex. A spacer assembly, the spacer assembly being housed within the lens barrel, the spacer assembly including a third spacer, a fourth spacer, and a sixth spacer, wherein the third spacer is located between the third lens and the fourth lens and is at least partially in contact with the third lens, the fourth spacer is located between the fourth lens and the fifth lens and is at least partially in contact with the fifth lens, and the sixth spacer is at least partially in contact with the image-side surface of the sixth lens; Between the first lens and the seventh lens, the air gap between the third lens and the fourth lens on the optical axis is smaller than the air gap between any two other adjacent lenses on the optical axis; The central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the air gap T34 between the third and fourth lenses on the optical axis, and the height L of the lens barrel satisfy the following condition: 0.1 < (CT3 + CT4 + T34) / L ≤ 0.15; The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the air gap T34 between the third and fourth lenses on the optical axis, and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis satisfy the following: -87.73≤(f3-f4) / (T34+EP34)≤-77.32; The air gap T34 between the third lens and the fourth lens on the optical axis, and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis, satisfy the following: 6.61≤EP34 / T34<8.0; The effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy the following condition: 2.07 ≤ f4 / f < 3.0; The radius of curvature R2 of the image side of the first lens and the radius of curvature R3 of the object side of the second lens satisfy the following condition: 1.08 ≤ R2 / R3 ≤ 1.

1.

2. The optical imaging lens according to claim 1, characterized in that, The spacer assembly further includes a first spacer and a second spacer. The first spacer is located between the first lens and the second lens and is at least partially in contact with the first lens. The second spacer is located between the second lens and the third lens and is at least partially in contact with the second lens. The distance EP01 between the object-side end face of the lens barrel and the object-side face of the first spacer along the optical axis, the distance EP12 between the image-side face of the first spacer and the object-side face of the second spacer along the optical axis, and the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy the following: -0.16≤(EP01+EP12) / (f1+f2)≤-0.

06.

3. The optical imaging lens according to claim 1, characterized in that, The air gap T23 between the second lens and the third lens on the optical axis, the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis, and the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy the following: -0.12≤(T23+EP34) / (f2-f3)≤0.

17.

4. The optical imaging lens according to claim 1, characterized in that, The spacer group further includes a fifth spacer, which is located between the fifth lens and the sixth lens and is at least partially in contact with the fifth lens. The air gap T67 between the sixth lens and the seventh lens on the optical axis and the distance EP56 between the image side of the fifth spacer and the object side of the sixth spacer along the optical axis satisfy the following: 1.65≤T67 / EP56<2.

5.

5. The optical imaging lens according to claim 1, characterized in that, The distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy the following: EP34 < 0.45 mm, 1.47 ≤ CT4 / EP34 < 1.

7.

6. The optical imaging lens according to claim 1, characterized in that, The effective focal length f4 of the fourth lens and the height L of the lens barrel satisfy the following condition: 1.73 ≤ f4 / L < 2.

4.

7. The optical imaging lens according to claim 1, characterized in that, The spacer group further includes a second spacer located between the second lens and the third lens and in at least partial contact with the second lens. The spacing distance EP23 between the image side of the second spacer and the object side of the third spacer along the optical axis and the combined focal length f23 of the second lens and the third lens satisfy the following: -30.72≤f23 / EP23≤-20.

36.

8. The optical imaging lens according to claim 1, characterized in that, The spacer group further includes a first spacer and a second spacer. The first spacer is located between the first lens and the second lens and is at least partially in contact with the first lens. The second spacer is located between the second lens and the third lens and is at least partially in contact with the second lens. The refractive index N1 of the first lens, the refractive index N2 of the second lens, the axial spacing distance EP12 between the image side surface of the first spacer and the object side surface of the second spacer, and the effective focal length f1 of the first lens satisfy: 0.27 ≤ (N1 + N2) * EP12 / |f1| ≤ 0.

32.

9. The optical imaging lens according to claim 1, characterized in that, The effective focal length f of the optical imaging lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 1.52 ≤ R6 / f ≤ 1.63; the radius of curvature R6 of the image side surface of the third lens, the inner diameter d3m of the image side surface of the third spacer, and the effective focal length f3 of the third lens satisfy: -9.25 mm ≤ d3m / (R6 / f3) ≤ -8.81 mm.

10. The optical imaging lens according to claim 1, characterized in that, The refractive index N4 of the fourth lens, the central thickness CT4 of the fourth lens on the optical axis, and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0 < N4 * CT4 / R7 < 0.05; the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 3.01 ≤ f4 / d4s ≤ 4.

05.

11. The optical imaging lens according to claim 1, characterized in that, The spacer group further includes a first spacer and a second spacer. The first spacer is located between the first lens and the second lens and is at least partially in contact with the first lens. The second spacer is located between the second lens and the third lens and is at least partially in contact with the second lens. The inner diameter d1m of the image side surface of the first spacer and the inner diameter d2m of the image side surface of the second spacer satisfy: 1.06 ≤ d1m / d2m ≤ 1.

11.

12. The optical imaging lens according to any one of claims 1-11, characterized in that, The spacer group further includes a fifth spacer. The fifth spacer is located between the fifth lens and the sixth lens and is at least partially in contact with the fifth lens. The axial spacing distance EP56 between the image side surface of the fifth spacer and the object side surface of the sixth spacer, the maximum thickness CP6 of the sixth spacer along the optical axis, and the air spacing T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.90 < (EP56 + CP6) / T67 < 1.

30.

13. The optical imaging lens according to any one of claims 1-11, characterized in that, The inner diameter d0s of the object side end face of the lens barrel, the inner diameter d0m of the image side end face of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field angle Semi-FOV of the optical imaging lens satisfy: 1.05 ≤ (d0m - d0s) / [f * tan(Semi-FOV)] ≤ 1.

15.

14. The optical imaging lens according to any one of claims 1-11, characterized in that, The spacer assembly further includes a sixth auxiliary spacer located between the sixth spacer and the seventh lens. The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy the following condition: -1.17 ≤ f6 / f7 ≤ -0.

52. The outer diameter D6m of the image-side surface of the sixth spacer, the outer diameter D6bs of the object-side surface of the sixth auxiliary spacer, and the inner diameter d6bs of the object-side surface of the sixth auxiliary spacer satisfy the following condition: 3.

0. <D6m / (D6bs-d6bs)≤4.67。 15. The optical imaging lens according to any one of claims 1-11, characterized in that, The combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens satisfies the following relationship with the height L of the lens barrel: 0.79 ≤ f456 / L ≤ 0.

82.

16. The optical imaging lens according to any one of claims 1-11, characterized in that, The maximum effective radius DT42 of the image side of the fourth lens, the maximum effective radius DT51 of the object side of the fifth lens, and the outer diameter D4s of the object side of the fourth spacer satisfy the following condition: 0.54≤(DT42+DT51) / D4s<0.6.

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