Optical lens

Abstract

The present invention provides an optical lens. The optical lens includes a lens barrel, as well as a lens group and a spacer element group located within the lens barrel. The lens group includes a first lens to a seventh lens arranged in sequence along the optical axis direction; the spacer element group at least includes a second spacer element, and the second spacer element is located between the second lens and the third lens and is in partial contact with the image side surface of the second lens; the following relationships are satisfied among the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, and the central thickness CT1 of the first lens on the optical axis: 1.60 < (DT11 - DT12) / CT1 < 2.10; the following relationship is satisfied between the combined focal length f12 of the first lens and the second lens and the inner diameter d2s of the object side surface of the second spacer element: -1.70 < f12 / d2s < -1.13. The present invention solves the problem of serious stray light in the prior art caused by the need to meet the requirements of the field angle for the optical lens.

Description

Technical Field

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

[0002] With the development of technology, more and more electronic products are equipped with optical lenses to enable them to have video recording capabilities. In the field of shooting, such as drones and action cameras, it is necessary to capture images with a wide field of view. For optical lenses with a wide field of view, in order to capture light within a wide field of view, the effective radius of the object side of the first lens is usually larger to increase the amount of light entering the optical lens and provide sufficient light for wide-angle imaging. When the effective radius of the object side of the first lens is larger than the effective radius of the image side of the first lens, the light is deflected at a large angle when passing through the first lens, causing some light to be deflected into the optical structure area of ​​the rear lens, forming stray light.

[0003] In other words, existing optical lenses suffer from severe stray light issues in order to meet the requirements of the field of view. Summary of the Invention

[0004] The main objective of this invention is to provide an optical lens to solve the problem of severe stray light caused by optical lenses in the prior art in order to meet the requirements of the field of view.

[0005] To achieve the above objectives, according to one aspect of the present invention, an optical lens is provided, comprising a lens barrel and a lens group and a spacer element group located within the lens barrel. The lens group consists of seven lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side along the optical axis. The first lens has a negative optical power. The spacer element group includes at least a second spacer element located between the second and third lenses and in contact with the image-side surface of the second lens. The maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, and the center thickness CT1 of the first lens along the optical axis satisfy the following: 1.60 < (DT11 - DT12) / CT1 < 2.10. The combined focal length f12 of the first and second lenses and the inner diameter d2s of the object side surface of the second spacer element satisfy the following: -1.70. <f12 / d2s<-1.13。

[0006] According to another aspect of the present invention, an optical lens is provided, comprising a lens barrel and a lens group and a spacer element group located within the lens barrel. The lens group consists of seven lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side along the optical axis. The first lens has a negative optical power. The spacer element group includes at least a second spacer element located between the second and third lenses and in contact with the image-side surface of the second lens. The maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, and the center thickness CT1 of the first lens on the optical axis satisfy the following: 1.60 < (DT11 - DT12) / CT1 < 2.10. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d2s of the object side surface of the second spacer element, and the axial distance SAG12 between the intersection of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens satisfy the following: -0.63. <f1 / f2*(d2s / SAG12)<1.30。

[0007] According to another aspect of the present invention, an optical lens is provided, comprising a lens barrel and a lens group and a spacer element group located within the lens barrel. The lens group consists of seven lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side along the optical axis. The object side surface of the seventh lens is convex, and the first lens has negative optical power. The spacer element group includes at least a fifth spacer element and a sixth spacer element, the fifth spacer element being located between the fifth and sixth lenses and in contact with the image side surface portion of the fifth lens. The sixth spacer element is located between the sixth and seventh lenses and contacts the image-side surface of the sixth lens. The central thickness CT6 of the sixth lens along the optical axis, the air gap T67 between the sixth and seventh lenses along the optical axis, and the distance EP56 between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element along the optical axis satisfy the following: 1.60 < (CT6 + T67) / EP56 < 3.75. The radius of curvature R13 of the object-side surface of the seventh lens, the refractive index N7 of the seventh lens, and the inner diameter d6m of the image-side surface of the sixth spacer element satisfy the following: 1.36 <R13*N7 / d6m<2.04。

[0008] Furthermore, the distance EP02 between the object-side end face of the lens barrel and the object-side surface of the second spacer element along the optical axis, the air gap T12 between the first and second lenses on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy the following: 1.22 <EP02 / (T12+CT2)<2.20。

[0009] Furthermore, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d2s of the object side surface of the second spacer element, and the axial distance SAG12 between the intersection of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens satisfy: -0.63 < f1 / f2 * (d2s / SAG12) < 1.30.

[0010] Furthermore, the third lens has a positive optical power, and the effective focal length f3 of the third lens, the inner diameter d2m of the image side surface of the second spacer element, and the refractive index N3 of the third lens satisfy: 2.57 < f3 / d2m * N3 < 4.68.

[0011] Furthermore, the spacer element group further includes a third spacer element, the third spacer element is located between the third lens and the fourth lens and is partially in contact with the image side surface of the third lens, and the axial spacing distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element and the air spacing T23 between the second lens and the third lens on the optical axis satisfy: 3.27 < EP23 / T23 < 8.29.

[0012] Furthermore, the spacer element group further includes a third spacer element, the third spacer element is located between the third lens and the fourth lens and is partially in contact with the image side surface of the third lens, and the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0.94 < CT3 / CT4 < 1.86; the central thickness CT4 of the fourth lens on the optical axis and the outer diameter D3s of the object side surface of the third spacer element satisfy: 6.31 < D3s / CT4 < 8.93.

[0013] Furthermore, the spacer element group further includes a fourth spacer element and a fifth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and is partially in contact with the image side surface of the fourth lens, the fifth spacer element is located between the fifth lens and the sixth lens and is partially in contact with the image side surface of the fifth lens, and the axial spacing distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element and the central thickness CT5 of the fifth lens on the optical axis satisfy: 3.10 < EP45 / CT5 < 3.46.

[0014] Furthermore, the spacer element group also includes a fourth spacer element and a fifth spacer element. The fourth spacer element is located between the fourth lens and the fifth lens and is in contact with the image-side surface of the fourth lens. The fifth spacer element is located between the fifth lens and the sixth lens and is in contact with the image-side surface of the fifth lens. The outer diameter D4m of the image-side surface of the fourth spacer element, the outer diameter D5s of the object-side surface of the fifth spacer element, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy the following: 2.05 < (D5s / D4m) * (CT6 / CT5) < 3.82.

[0015] Furthermore, the spacer group also includes a fifth spacer and a sixth spacer. The fifth spacer is located between the fifth lens and the sixth lens and is in contact with the image-side surface of the fifth lens. The sixth spacer is located between the sixth lens and the seventh lens and is in contact with the image-side surface of the sixth lens. The inner diameter d5m of the image-side surface of the fifth spacer, the inner diameter d6s of the object-side surface of the sixth spacer, and the maximum effective radius DT62 of the image-side surface of the sixth lens satisfy the following condition: 0.47 < (d6s - d5m) / DT62 < 0.93.

[0016] Furthermore, the spacer element group also includes a fifth spacer element and a sixth spacer element. The fifth spacer element is located between the fifth and sixth lenses and contacts the image-side surface of the fifth lens. The sixth spacer element is located between the sixth and seventh lenses and contacts the image-side surface of the sixth lens. The distance EP56 between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element along the optical axis, and the air gap T56 between the fifth and sixth lenses along the optical axis, satisfy: 0.26 <T56 / EP56<0.85。

[0017] Furthermore, the spacer element group also includes a sixth spacer element, which is located between the sixth and seventh lenses and contacts the image-side surface of the sixth lens. The inner diameter d6s of the object-side surface of the sixth spacer element and the distance YC62 from the inflection point of the effective diameter of the image-side surface of the sixth lens away from the optical axis satisfy the following condition: 2.27 <d6s / Yc62<2.89。

[0018] Furthermore, the seventh lens has negative optical power, and the spacer group also includes a sixth spacer element. The sixth spacer element is located between the sixth and seventh lenses and contacts the image-side surface of the sixth lens. The effective focal length f7 of the seventh lens, the outer diameter D6s of the object-side surface of the sixth spacer element, and the inner diameter d6s of the object-side surface of the sixth spacer element satisfy the following relationship: -3.51 <f7 / (D6s-d6s)<-1.99。

[0019] Furthermore, the spacer group also includes a sixth spacer element, which is located between the sixth and seventh lenses and contacts the image-side surface of the sixth lens. The combined focal length f56 of the fifth and sixth lenses and the inner diameter d6m of the image-side surface of the sixth lens satisfy the following condition: -2.16 <f56 / d6m<-1.07。

[0020] According to the technical solution of this invention, the optical lens includes a lens barrel and a lens group and a spacer element group located within the lens barrel. The lens group consists of seven lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side along the optical axis. The first lens has a negative optical power. The spacer element group includes at least a second spacer element, which is located between the second and third lenses and partially contacts the image side surface of the second lens. The maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, and the center thickness CT1 of the first lens on the optical axis satisfy the following: 1.60 < (DT11 - DT12) / CT1 < 2.10. The combined focal length f12 of the first and second lenses and the inner diameter d2s of the object side surface of the second spacer element satisfy the following: -1.70. <f12 / d2s<-1.13。

[0021] The optical lens of this application consists of a lens barrel, seven lenses, and at least one spacer element. When the maximum effective radius DT11 of the object side of the first lens, the maximum effective radius DT12 of the image side of the first lens, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 1.60 < (DT11-DT12) / CT1 < 2.10, the difference between the maximum effective radius of the object side of the first lens and the maximum effective radius of the image side of the first lens is greater than the center thickness of the first lens. This results in a larger difference between the maximum effective radius of the object side of the first lens and the maximum effective radius of the image side of the first lens. While ensuring the range of light collected by the first lens, this leads to a larger light deflection angle, allowing more light to enter the optical lens. At the same time, light entering the rear lens is easily deflected to the optical structure area, forming stray light. To reduce stray light generation, this application constrains f12 / d2s within a reasonable range, ensuring the degree of light deflection by the first and second lenses. This helps to constrain the exit angle of light from the second lens, reducing the amount of light incident on the optical structure area of ​​the third lens. Simultaneously, it constrains the inner diameter of the second spacer element to block light emitted from the optical structure area of ​​the second lens, while preventing the formation of reflected stray light on the inner diameter surface of the second spacer element. This ensures that the imaging surface is free of high-energy stray light spots that could affect the imaging quality of the optical lens. At the same time, it is necessary to ensure that the optical lens meets the requirements for relative illumination, field curvature, peak value, and other optical performance, thus ensuring the stability of the lens's optical performance. Attached Figure Description

[0022] 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:

[0023] Figure 1 A dimensioned diagram of an optical lens according to an alternative embodiment of the present invention is shown;

[0024] Figure 2 A schematic diagram of the structure of the optical lens of Embodiment 1-1 of the present invention is shown;

[0025] Figure 3 The diagram shows the structural schematics of the optical lenses of embodiments 1-2 of the present invention;

[0026] Figure 4 The diagram shows the structural schematics of the optical lenses of embodiments 1-3 of the present invention;

[0027] Figures 5 to 7 The on-axis chromatic aberration, astigmatism curves, and magnification chromatic aberration curves of the optical lens of Embodiment 1 of the present invention are shown respectively.

[0028] Figure 8 A schematic diagram of the optical lens of Embodiment 2-1 of the present invention is shown;

[0029] Figure 9 A schematic diagram of the optical lens of Embodiment 2-2 of the present invention is shown;

[0030] Figure 10 The diagram shows the structural schematics of the optical lenses of embodiments 2-3 of the present invention;

[0031] Figures 11 to 13 The on-axis chromatic aberration, astigmatism curves, and magnification chromatic aberration curves of the optical lens of Embodiment 2 of the present invention are shown respectively.

[0032] Figure 14 A schematic diagram of the optical lens of Embodiment 3-1 of the present invention is shown;

[0033] Figure 15 A schematic diagram of the optical lens of Embodiment 3-2 of the present invention is shown;

[0034] Figure 16 A schematic diagram of the optical lens of Embodiment 3-3 of the present invention is shown;

[0035] Figures 17 to 19 The on-axis chromatic aberration, astigmatism curves, and magnification chromatic aberration curves of the optical lens of Embodiment 3 of the present invention are shown respectively.

[0036] Figure 20A partial optical path diagram of an optical lens in an alternative embodiment of the present invention is shown;

[0037] Figure 21 It shows Figure 20 Stray light pattern of a medium optical lens;

[0038] Figure 22 A partial optical path diagram of an optical lens in an example is shown;

[0039] Figure 23 It shows Figure 22 Stray light pattern of a medium optical lens;

[0040] Figure 24 A partial optical path diagram of an optical lens in another example is shown;

[0041] Figure 25 It shows Figure 24 A stray light pattern on a medium optical lens.

[0042] The above figures include the following reference numerals:

[0043] E1, First lens; P1, First spacer element; E2, Second lens; P2, Second spacer element; E3, Third lens; P3, Third spacer element; E4, Fourth lens; P4, Fourth spacer element; E5, Fifth lens; P5, Fifth spacer element; E6, Sixth lens; P6, Sixth spacer element; E7, Seventh lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; S9, Object-side surface of the fifth lens; S10, Image-side surface of the fifth lens; S11, Object-side surface of the sixth lens; S12, Image-side surface of the sixth 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 the 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 the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to the judgment method commonly known in the art, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. 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. In this application, the left side is the object side, and the right side is the image side.

[0050] To address the problem of severe stray light caused by optical lenses in existing technologies in order to meet the requirements of field of view, this invention provides an optical lens.

[0051] like Figures 1 to 19As shown, the optical lens includes a lens barrel and a lens group and a spacer element group located within the lens barrel. The lens group consists of seven lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side along the optical axis. The first lens has negative optical power. The spacer element group includes at least a second spacer element, which is located between the second and third lenses and contacts the image side surface of the second lens. The maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 1.60 < (DT11 - DT12) / CT1 < 2.10. The combined focal length f12 of the first and second lenses and the inner diameter d2s of the object side surface of the second spacer element satisfy the following condition: -1.70. <f12 / d2s<-1.13。

[0052] The optical lens of this application consists of a lens barrel, seven lenses, and at least one spacer element. When the maximum effective radius DT11 of the object side of the first lens, the maximum effective radius DT12 of the image side of the first lens, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 1.60 < (DT11-DT12) / CT1 < 2.10, the difference between the maximum effective radius of the object side of the first lens and the maximum effective radius of the image side of the first lens is greater than the center thickness of the first lens. This results in a larger difference between the maximum effective radius of the object side of the first lens and the maximum effective radius of the image side of the first lens. While ensuring the range of light collected by the first lens, this leads to a larger light deflection angle, allowing more light to enter the optical lens. At the same time, light entering the rear lens is easily deflected to the optical structure area, forming stray light. To reduce stray light generation, this application constrains f12 / d2s within a reasonable range, ensuring the degree of light deflection by the first and second lenses. This helps to constrain the exit angle of light from the second lens, reducing the amount of light incident on the optical structure area of ​​the third lens. Simultaneously, it constrains the inner diameter of the second spacer element to block light emitted from the optical structure area of ​​the second lens, while preventing the formation of reflected stray light on the inner diameter surface of the second spacer element. This ensures that the imaging surface is free of high-energy stray light spots that could affect the imaging quality of the optical lens. At the same time, it is necessary to ensure that the optical lens meets the requirements for relative illumination, field curvature, peak value, and other optical performance, thus ensuring the stability of the lens's optical performance.

[0053] In addition, please refer to Table 1 below and Figures 20 to 25 As shown, Figure 20 The optical path diagram of the lens is shown when (DT11-DT12) / CT1=2 and f12 / d2s=-1.5. Figure 21 It shows Figure 20 Stray light pattern of a medium optical lens. Figure 22The optical path diagram of the lens is shown when (DT11-DT12) / CT1=2 and f12 / d2s=-1. Figure 23 It shows Figure 22 Stray light pattern of a medium optical lens. Figure 24 The optical path diagram of the lens is shown when (DT11-DT12) / CT1=2 and f12 / d2s=-2. Figure 25 It shows Figure 24 The image shows stray light patterns of a medium-sized optical lens. These stray light patterns simulate geometrical ray spots (Geometrical Ray SPOTS) formed on the imaging surface. The stray light patterns also display the energy intensity distribution of the stray light. The X and Y axes represent the spatial position of the stray light on the imaging surface, showing the peak position of the energy distribution on the imaging surface. The color intensity represents the strength of the stray light's energy, i.e., the luminous flux per square millimeter (FLUX / sq-MM) on the imaging surface.

[0054] Depend on Figures 20 to 25 As shown, when the optical lens satisfies (DT11-DT12) / CT1 = 2 and f12 / d2s = -1.5, the energy of the stray light spots produced by the incident light is generally small, resulting in higher image quality. When the optical lens satisfies (DT11-DT12) / CT1 = 2 and f12 / d2s = -1, the inner diameter of the object-side surface of the second spacer element is large. When the light passes through the optical structure area of ​​the second lens, some of the light is scattered and passes through the second spacer element into the rear optical system, producing high-energy stray light spots on the imaging surface, affecting the image quality of the optical lens. When the optical lens satisfies (DT11-DT12) / CT1 = 2 and f12 / d2s = -2, the inner diameter of the object-side surface of the second spacer element is small. The light undergoes strong reflection on the inner diameter surface of the second spacer element, presenting arc-shaped stray light on the imaging surface. In this case, the energy of the stray light spots is high, affecting the image quality of the optical lens. Therefore, by constraining f12 / d2s within the range of -1.70 to -1.13, this application can control the relationship between the light emission range from the second lens and the inner diameter of the second spacer element, thereby reducing stray light generation and improving imaging quality.

[0055]

[0056] Table 1

[0057] It should be noted that in this application, f12 / d2s is restricted within a reasonable range to constrain the relationship between the combined focal length of the first lens and the second lens and the second spacer element, control the degree of light deflection in the first lens and the second lens, and at the same time constrain the light-shielding range of the second spacer element to ensure that the second spacer element absorbs transmitted stray light and reflected stray light, which is conducive to reducing the generation of stray light and solving the problem of stray light caused when (DT11 - DT12) / CT1 is within the range of 1.60 to 2.10. When f12 / d2s meets the above range, the problem of severe stray light can be solved, and it does not depend on the optical power and surface shape of other lenses. The optical power and surface shape of other lenses are further optimizations of the optical lens based on this. The optical power of each of the other lenses can be positive or negative according to the design requirements of the actual optical system, and the surface shape of each of the other lenses can be convex or concave according to the design requirements of the optical system. When the optical system satisfies: 1.60 < (DT11 - DT12) / CT1 < 2.10; -1.70 < f12 / d2s < -1.13, it can meet the requirements of the field angle of the optical lens while reducing the influence of stray light.

[0058] For example, in some optional embodiments, the first lens has a negative optical power, which is conducive to expanding the field angle of the optical imaging device and making the shooting or observation range wider. For another example, in some optional embodiments, the third lens has a positive optical power, which can balance the aberration brought by the first lens and improve the imaging quality. For another example, in some optional embodiments, the fourth lens has a positive optical power, which is conducive to the gentle convergence of light to the rear optical system and ensures the imaging quality of the optical lens. For another example, in some optional embodiments, the fifth lens has a negative optical power, which balances the aberration brought by the front positive lens, improves the imaging quality, and at the same time appropriately diverges the light, which is conducive to the gentle transition of light to the rear optical system. For another example, in some optional embodiments, the sixth lens has a positive optical power, which appropriately converges the light to avoid serious light diffusion and mismatch with the chip. For another example, in some optional embodiments, the seventh lens has a negative optical power, which can balance the aberration brought by the front positive lens and at the same time is conducive to ensuring the field angle of the optical lens.

[0059] For another example, in some alternative embodiments, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the image side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave; the object side surface of the sixth lens is convex; the object side surface of the seventh lens is convex; the image side surface of the seventh lens is concave. By reasonably restricting the surface types of each lens, it is beneficial to reasonably restrict the light path, ensure a smooth transition of light, and is conducive to correcting aberration. The optical lens can be simulated through software and / or tools such as ZEMAX, CODEV, etc. Preferably, the optical lens can be simulated through ZEMAX. During the simulation process using software and / or tools such as the above, the surface types of each lens can be simulated according to the built-in surface types of the software and / or tool used and appropriately adjusted.

[0060] In some alternative embodiments, the spacing distance EP02 along the optical axis direction from the object side end surface of the lens barrel to the object side surface of the second spacer element, the air spacing T12 between the first lens and the second lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 1.22 < EP02 / (T12 + CT2) < 2.20. By restricting EP02 / (T12 + CT2) within a reasonable range, it is possible to ensure the spacing distance along the optical axis direction from the object side end surface of the lens barrel to the object side surface of the second spacer element, thereby ensuring that the minimum edge thicknesses of the first lens and the second lens meet the processing requirements. At the same time, it ensures the front wall thickness of the lens barrel and, to ensure the structural strength of the lens barrel, is conducive to improving the assembly stability of the optical lens. At the same time, it can also restrict the dispensing space to ensure smooth dispensing, which is beneficial to improving the stability of the optical performance before and after the reliability test of the optical lens. At the same time, restricting the air spacing T12 between the first lens and the second lens on the optical axis and the central thickness CT2 of the second lens on the optical axis can improve the sensitivity of the optical lens, which is beneficial to ensuring the stability of the optical back focus.

[0061] In some optional embodiments, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d2s of the object side surface of the second spacer element, and the axial distance SAG12 between the intersection of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens satisfy: -0.63 < f1 / f2 * (d2s / SAG12) < 1.30. By restricting f1 / f2 * (d2s / SAG12) within a reasonable range, the deflection angles of light rays in the first lens and the second lens can be limited, and further, the deflection angles of marginal rays passing through the first lens and the second lens can be controlled, effectively reducing the light rays incident on the optical structure area. At the same time, the second spacer element can effectively intercept the penetrating stray light generated by the first lens and the second lens and the reflected stray light generated at the flange surface position of the second lens, further reducing the generation of stray light, which is beneficial to improving the imaging quality of the optical lens. At the same time, restricting SAG12 ensures the machinability of the first lens, and further ensures the clamping feasibility of the first lens in the core-pulling process.

[0062] In some optional embodiments, the third lens has a positive optical power, and the effective focal length f3 of the third lens, the inner diameter d2m of the image side surface of the second spacer element, and the refractive index N3 of the third lens satisfy: 2.57 < f3 / d2m * N3 < 4.68. By restricting f3 / d2m * N3 within a reasonable range, it can ensure the interception of the stray light path by the second spacer element and ensure the improvement effect on the stray light. At the same time, by restricting the parameters of the third lens, the deflection angle of light rays in the third lens can be controlled, reducing the large-angle deflection of light rays, which is beneficial to further reducing the generation of stray light. At the same time, the radial size of the third lens can also be restricted to ensure the accurate transmission path of the chief ray.

[0063] In some optional embodiments, the spacer element group further includes a third spacer element. The third spacer element is located between the third lens and the fourth lens and is in partial contact with the image side surface of the third lens. The spacer distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 3.27 < EP23 / T23 < 8.29. By restricting EP23 / T23 within a reasonable range, it is beneficial to restrict the edge thickness of the third lens and the air gap between the second lens and the third lens on the optical axis, ensuring the assembly stability between the second lens and the third lens, preventing the surface shape of the object side surface of the third lens from being affected before and after the high-temperature and high-humidity reliability test of the optical lens, and further affecting the field curvature and peak value of each field of the optical lens.

[0064] In some alternative embodiments, the spacer element group further includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image-side surface portion of the third lens. The center thickness CT3 of the third lens on the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy: 0.94 < CT3 / CT4 < 1.86; the center thickness CT4 of the fourth lens on the optical axis and the outer diameter D3s of the object-side surface of the third spacer element satisfy: 6.31 < D3s / CT4 < 8.93. By restricting CT3 / CT4 within a reasonable range, the center thicknesses of the third lens and the fourth lens can be restricted to be relatively close, which is beneficial to ensuring the stability of the assembly of the optical lens group. At the same time, by restricting D3s / CT4 within a reasonable range, the molding property of the fourth lens can be optimized, which is beneficial to the demolding of the fourth lens.

[0065] In some alternative embodiments, the spacer element group further includes a fourth spacer element and a fifth spacer element. The fourth spacer element is located between the fourth lens and the fifth lens and contacts the image-side surface portion of the fourth lens. The fifth spacer element is located between the fifth lens and the sixth lens and contacts the image-side surface portion of the fifth lens. The spacing distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element in the optical axis direction and the center thickness CT5 of the fifth lens on the optical axis satisfy: 3.10 < EP45 / CT5 < 3.46. By restricting EP45 / CT5 within a reasonable range, the edge thickness and the center thickness of the fifth lens can be restricted within a reasonable range, ensuring the machinability of the fifth lens on the premise of meeting the requirements of light deflection, and preventing problems such as weld lines caused by an excessive ratio of the thick and thin parts of the lens structure of the fifth lens.

[0066] In some alternative embodiments, the spacer element group further includes a fourth spacer element and a fifth spacer element. The fourth spacer element is located between the fourth lens and the fifth lens and contacts the image-side surface portion of the fourth lens. The fifth spacer element is located between the fifth lens and the sixth lens and contacts the image-side surface portion of the fifth lens. The outer diameter D4m of the image-side surface of the fourth spacer element, the outer diameter D5s of the object-side surface of the fifth spacer element, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 2.05 < (D5s / D4m)*(CT6 / CT5) < 3.82. By restricting (D5s / D4m)*(CT6 / CT5) within a reasonable range, the outer diameter dimensions of the fifth lens and the sixth lens can be restricted, while ensuring the center thicknesses of the fifth lens and the sixth lens, which can ensure the assembly stability of the fifth lens and the sixth lens and reduce the sensitivity of the center thicknesses of the fifth lens and the sixth lens to the field curvature of the optical lens.

[0067] In some optional embodiments, the spacer element group further includes a fifth spacer element and a sixth spacer element. The fifth spacer element is located between the fifth lens and the sixth lens and contacts a part of the image-side surface of the fifth lens. The sixth spacer element is located between the sixth lens and the seventh lens and contacts a part of the image-side surface of the sixth lens. The inner diameter d5m of the image-side surface of the fifth spacer element, the inner diameter d6s of the object-side surface of the sixth spacer element, and the maximum effective radius DT62 of the image-side surface of the sixth lens satisfy: 0.47 < (d6s - d5m) / DT62 < 0.93. By constraining (d6s - d5m) / DT62 within a reasonable range, the range of the structural area of the sixth lens blocked by the fifth spacer element and the sixth spacer element can be constrained. Furthermore, it is beneficial to constrain the range of light entering the sixth lens and the range of light exiting the sixth lens. Consequently, the deflection angle of light at the edge position of the sixth lens can be ensured, reducing the sensitivity of the surface shape of the sixth lens to the performance of the optical lens. At the same time, by constraining the maximum effective radius of the image-side surface of the sixth lens and the inner diameter size of the sixth spacer element, the reflected stray light generated at the edge position of the maximum effective diameter of the image-side surface of the sixth lens can be intercepted, ensuring the imaging quality.

[0068] In some optional embodiments, the spacer element group further includes a fifth spacer element and a sixth spacer element. The fifth spacer element is located between the fifth lens and the sixth lens and contacts a part of the image-side surface of the fifth lens. The sixth spacer element is located between the sixth lens and the seventh lens and contacts a part of the image-side surface of the sixth lens. The spacing distance EP56 between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element in the optical axis direction, and the air spacing T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.26 < T56 / EP56 < 0.85. By constraining T56 / EP56 within a reasonable range, the relationship between EP56 and T56 is restricted, preventing the optical lens from being affected by air expansion and extrusion after baking due to excessive air spacing, which may affect the surface shape of the lens. At the same time, it helps to meet the notch depth at the notch position of the fifth lens, which is beneficial to the forming of the fifth lens.

[0069] In some optional embodiments, the spacer element group further includes a sixth spacer element. The sixth spacer element is located between the sixth lens and the seventh lens and contacts a part of the image-side surface of the sixth lens. The inner diameter d6s of the object-side surface of the sixth spacer element and the distance YC62 from the inflection point of the effective diameter of the image-side surface of the sixth lens away from the optical axis to the optical axis satisfy: 2.27 < d6s / Yc62 < 2.89. By constraining d6s / Yc62 within a reasonable range, it is beneficial to ensure the deflection angle of light in the sixth lens, enabling the light to be transmitted smoothly to the imaging surface. At the same time, the sixth spacer element intercepts the stray light exiting the sixth lens, reducing the stray light incident on the subsequent optical system, which is beneficial to improving the imaging quality of the optical lens.

[0070] Among them, the above-mentioned inflection point can be understood as the position where the concavity and convexity change within the effective diameter region of the image side of the sixth lens, and it can also be called an anti-curve point.

[0071] In some alternative embodiments, the seventh lens has a negative optical power, and the spacer element group further includes a sixth spacer element. The sixth spacer element is located between the sixth lens and the seventh lens and is partially in contact with the image side of the sixth lens. The following relationship is satisfied among the effective focal length f7 of the seventh lens, the outer diameter D6s of the object side of the sixth spacer element, and the inner diameter d6s of the object side of the sixth spacer element: -3.51 < f7 / (D6s - d6s) < -1.99. By constraining f7 / (D6s - d6s) within a reasonable range, the contact area between the seventh lens and the sixth spacer element can be ensured, thereby ensuring the stability of the support of the seventh lens, which is beneficial to improving the assembly yield rate of the optical lens during the production process. At the same time, the degree of deflection of light rays in the seventh lens is constrained, which is beneficial to the smooth transmission of light rays to the imaging surface.

[0072] In some alternative embodiments, the spacer element group further includes a sixth spacer element. The sixth spacer element is located between the sixth lens and the seventh lens and is partially in contact with the image side of the sixth lens. The following relationship is satisfied between the combined focal length f56 of the fifth lens and the sixth lens and the inner diameter d6m of the image side of the sixth lens: -2.16 < f56 / d6m < -1.07. By constraining f56 / d6m within a reasonable range, it is beneficial to improve the stray light between the fifth lens and the sixth lens, ensure the imaging quality of the optical lens, and at the same time ensure the transmission path of the chief ray and ensure its smooth transmission to the imaging surface.

[0073] In another alternative embodiment, the optical lens includes a lens barrel, a lens group, and a spacer element group located within the lens barrel. The lens group consists of seven lenses, and 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 arranged in sequence from the object side to the image side along the optical axis. The first lens has a negative optical power; the spacer element group at least includes a second spacer element. The second spacer element is located between the second lens and the third lens and is partially in contact with the image side of the second lens. The following relationship is satisfied among the maximum effective radius DT11 of the object side of the first lens, the maximum effective radius DT12 of the image side of the first lens, and the central thickness CT1 of the first lens on the optical axis: 1.60 < (DT11 - DT12) / CT1 < 2.10; the following relationship is satisfied among the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d2s of the object side of the second spacer element, and the axial distance SAG12 between the intersection of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens: -0.63 < f1 / f2 * (d2s / SAG12) < 1.30.

[0074] The optical lens of this application consists of a lens barrel, seven lenses, and at least one spacer element. When the maximum effective radius DT11 of the object side of the first lens, the maximum effective radius DT12 of the image side of the first lens, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 1.60 < (DT11-DT12) / CT1 < 2.10, the difference between the maximum effective radius of the object side of the first lens and the maximum effective radius of the image side of the first lens is greater than the center thickness of the first lens. This results in a larger difference between the maximum effective radius of the object side of the first lens and the maximum effective radius of the image side of the first lens. While ensuring the range of light collected by the first lens, this leads to a larger light deflection angle, allowing more light to enter the optical lens. At the same time, light entering the rear lens is easily deflected to the optical structure area, forming stray light. To reduce stray light generation, this application constrains f1 / f2*(d2s / SAG12) within a reasonable range, which limits the deflection angle of light in the first and second lenses, thereby controlling the deflection angle of edge light when passing through the first and second lenses. This effectively reduces the light rays incident on the optical structure area. At the same time, the second spacer element can effectively intercept the transmitted stray light generated by the first and second lenses, as well as the reflected stray light generated at the flange surface of the second lens, preventing the light rays from forming reflected stray light on the inner diameter surface of the second spacer element. This ensures that there are no high-energy stray light spots on the imaging surface, which is beneficial to improving the imaging quality of the optical lens.

[0075] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0076] In another alternative embodiment, the optical lens includes a lens barrel and a lens group and a spacer group located within the lens barrel. The lens group consists of seven lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side along the optical axis. The object side of the seventh lens is convex, and the first lens has negative optical power. The spacer group includes at least a fifth spacer element and a sixth spacer element. The fifth spacer element is located between the fifth and sixth lenses and contacts the image side of the fifth lens. The spacer element is located between the sixth and seventh lenses and contacts the image-side surface of the sixth lens. The central thickness CT6 of the sixth lens along the optical axis, the air gap T67 between the sixth and seventh lenses along the optical axis, and the distance EP56 between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element along the optical axis satisfy the following: 1.60 < (CT6 + T67) / EP56 < 3.75. The radius of curvature R13 of the object-side surface of the seventh lens, the refractive index N7 of the seventh lens, and the inner diameter d6m of the image-side surface of the sixth spacer element satisfy the following: 1.36 <R13*N7 / d6m<2.04。

[0077] The optical lens of this application consists of a lens barrel, seven lenses, and at least one spacer element. When the center thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth and seventh lenses on the optical axis, and the distance EP56 between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis satisfy the condition: 1.60 < (CT6 + T67) / EP56 < 3.75, the distance between the object side of the sixth lens and the object side of the seventh lens is relatively larger than the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis. This results in a longer transmission distance of light in the sixth lens and between the sixth and seventh lenses, which easily increases the risk of stray light entering the rear optical system. To reduce stray light generation, this application constrains R13*N7 / d6m within a reasonable range, which limits the deflection angle of light entering the image side of the seventh lens, thereby reducing large-angle deflected light and thus helping to reduce stray light generation. At the same time, constraining the inner diameter of the image side of the sixth spacer element can effectively block stray light incident on the optical structure area of ​​the seventh lens, ensuring that there are no high-energy stray light spots on the imaging surface, which is beneficial to improving the imaging quality of the optical lens.

[0078] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0079] Optionally, the aforementioned optical lens may also include protective glass for protecting the photosensitive element located on the imaging plane.

[0080] It should be noted that each lens consists of an effective diameter region at the center and a structural region at the edge. The structural region is located on the outer periphery of the effective diameter region and is arranged circumferentially around it. The effective diameter region is used for the passage of imaging light rays, while the structural region is not used for the passage of imaging light rays. The structural region is used to contact the lens barrel, adjacent lenses, or adjacent spacer elements. The structural region is also called the non-effective diameter region.

[0081] The optical lens in this application may employ multiple lenses, such as the seven lenses described above. 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 the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0082] However, those skilled in the art will understand that the number of lenses constituting the optical 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 lens is not limited to including seven lenses. If necessary, the optical lens may also include other numbers of lenses.

[0083] Figure 1 A schematic diagram showing the dimensions of an optical lens according to this application is provided. Figure 1 The parameters d2s, d2m, D3s, D4m, d5m, D5s, d6s, d6m, D6s, EP02, EP23, EP45, and EP56 are clearly and intuitively indicated to provide a clear understanding of their meaning. To facilitate the description of the optical lens and the specific lens shape, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0084] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical lenses applicable to the above embodiments.

[0085] It should be noted that in the following Embodiment 1, there are Embodiments 1-1, 1-2, and 1-3; in Embodiment 2, there are Embodiments 2-1, 2-2, and 2-3; and in Embodiment 3, there are Embodiments 3-1, 3-2, and 3-3. Within the same embodiment, the first to seventh lenses of the optical lens have the same radius of curvature, center thickness, and other parameters, as well as the inter-lens spacing and higher-order coefficients. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, the second spacer element, and the third spacer element, and the shape of some lenses are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0086] It should be noted that any of the embodiments described in Examples 1 to 3 below are applicable to all implementation methods of this application.

[0087] Example 1

[0088] like Figures 2 to 7 As shown, the optical lens of Embodiment 1 is described. Figure 2 A schematic diagram of the optical lens of Embodiment 1-1 is shown. Figure 3 A schematic diagram of the optical lens structure of Embodiments 1-2 is shown. Figure 4 A schematic diagram of the optical lens structure of Embodiments 1-3 is shown.

[0089] like Figures 2 to 4As shown, the optical lens includes a lens barrel, seven lenses, and multiple spacer elements. The lens barrel includes a first lens E1, 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, arranged sequentially from the object side to the image side.

[0090] like Figure 2 The diagram shown is a schematic representation of the optical lens structure of Embodiment 1-1. In this example, the object-side surface S1 of the first lens is in contact with the lens barrel. The image-side surface S2 of the first lens is in contact with the object-side surface S3 of the second lens. The object-side surface and image-side surface of the second spacer element are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer element are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer element are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the fifth spacer element are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side surface and image-side surface of the sixth spacer element are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The image-side surface S14 of the seventh lens is spaced apart from the lens barrel.

[0091] like Figure 3 The diagram shown is a schematic representation of the optical lens structure of Embodiments 1-2. In this example, the object-side surface S1 of the first lens is spaced apart from the lens barrel, and the image-side surface S14 of the seventh lens is in contact with part of the lens barrel. The bearing and contact methods of each spacer element are the same as in Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0092] like Figure 4 The diagram shows a schematic representation of the optical lens structure in Embodiments 1-3. In this example, the optical lens further includes a first spacer element P1. The object-side surface S1 of the first lens is spaced apart from the lens barrel. The object-side surface and image-side surface of the first spacer element partially contact the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The image-side surface S14 of the seventh lens partially contacts the lens barrel. The contact and abutment methods of the other spacer elements are the same as in Embodiments 1-1, and can be referred to the relevant descriptions in Embodiments 1-1, which will not be repeated here.

[0093] In summary, the structural parameters of the optical lens of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 9.

[0094] In Embodiment 1, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The sixth lens E6 has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens E7 has negative optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave. In Table 2, OBJ (not shown in the figure) is the object plane of the optical lens, and STO (not shown in the figure) is the aperture stop, which is located between the third lens and the fourth lens.

[0095] Table 2 shows the basic structural parameters of the optical lens in Embodiment 1, where the units for radius of curvature and thickness are millimeters (mm).

[0096]

[0097]

[0098] Table 2

[0099] In Embodiment 1, the object-side surface and image-side surface of the second lens E2 to the seventh lens E7 are both aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0100]

[0101] 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, i.e., 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 3 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S3-S14 in Example 1.

[0102] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 1.9909E-02 -8.9332E-03 2.9808E-03 -2.6022E-03 9.0670E-04 -1.2488E-04 5.5162E-06 0.0000E+00 0.0000E+00 S4 4.9165E-02 -1.0303E-02 5.9386E-03 -7.3318E-03 2.9740E-03 -5.6809E-04 6.7707E-05 0.0000E+00 0.0000E+00 S5 1.0440E-02 -2.9017E-03 -1.7643E-03 2.4337E-03 -2.2822E-03 8.6296E-04 -1.0877E-04 0.0000E+00 0.0000E+00 S6 7.5566E-03 -7.3319E-03 -1.6819E-03 5.6590E-03 -4.6200E-03 1.8671E-03 -3.0822E-04 0.0000E+00 0.0000E+00 S7 2.2186E-02 -1.8826E-02 9.2781E-03 -5.7651E-03 2.2585E-03 -5.3428E-04 3.7404E-05 0.0000E+00 0.0000E+00 S8 -5.8482E-02 1.5987E-02 -1.2013E-02 8.0015E-03 -3.5687E-03 8.7223E-04 -9.5512E-05 0.0000E+00 0.0000E+00 S9 -2.6705E-02 -4.4600E-02 3.6636E-02 -1.5409E-02 4.8774E-03 -1.0352E-03 9.8345E-05 0.0000E+00 0.0000E+00 S10 2.2678E-02 -4.6999E-02 3.6339E-02 -1.5937E-02 4.5686E-03 -7.6616E-04 5.5006E-05 0.0000E+00 0.0000E+00 S11 -2.2271E-02 2.2898E-02 -1.7201E-02 8.5572E-03 -2.9890E-03 6.4194E-04 -7.3907E-05 3.2225E-06 0.0000E+00 S12 -2.8496E-02 2.2939E-02 -1.2089E-02 5.5764E-03 -1.9710E-03 4.5520E-04 -6.3734E-05 4.9150E-06 -1.6059E-07 S13 -1.0914E-01 2.4504E-02 -3.8286E-03 3.6578E-04 9.0683E-06 -5.7522E-07 -1.2019E-06 1.7223E-07 -6.9116E-09 S14 -9.4474E-02 3.2138E-02 -9.0785E-03 1.9649E-03 -3.0972E-04 3.3568E-05 -2.3368E-06 9.2615E-08 -1.5541E-09

[0103] Table 3

[0104] Figure 5 The on-axis chromatic aberration curve of the optical lens of Embodiment 1 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical lens. Figure 6 The astigmatism curve of the optical lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 7 The magnification chromatic aberration curve of the optical lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens.

[0105] according to Figures 5 to 7 As can be seen, the optical lens given in Example 1 can achieve good imaging quality.

[0106] Example 2

[0107] like Figures 8 to 13 As shown, the optical lens of Embodiment 2 is described. Figure 8 A schematic diagram of the optical lens of Embodiment 1-1 is shown. Figure 9 A schematic diagram of the optical lens structure of Embodiments 1-2 is shown. Figure 10 A schematic diagram of the optical lens structure of Embodiments 1-3 is shown.

[0108] like Figures 8 to 10 As shown, the optical lens includes a lens barrel, seven lenses, and multiple spacer elements. The lens barrel includes a first lens E1, 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, arranged sequentially from the object side to the image side.

[0109] like Figure 8 The diagram shown is a schematic representation of the optical lens in Embodiment 1-1. In this example, the optical lens further includes a first spacer element P1, with the object-side surface S1 of the first lens spaced apart from the lens barrel. The object-side surface and image-side surface of the first spacer element partially contact the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer element partially contact the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer element partially contact the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively; the object-side surface and image-side surface of the fourth spacer element partially contact the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively; the object-side surface and image-side surface of the fifth spacer element partially contact the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively; the object-side surface and image-side surface of the sixth spacer element partially contact the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively; and the image-side surface S14 of the seventh lens partially contacts the lens barrel.

[0110] like Figure 9The diagram shown is a schematic representation of the optical lens structure of Embodiment 1-2. In this example, the image-side surface S2 of the first lens partially contacts the object-side surface S3 of the second lens. The contact method of the other spacer elements is the same as in Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0111] like Figure 10 The diagram shows a schematic representation of the optical lens structure in Embodiments 1-3. In this example, the object-side surface S1 of the first lens is in contact with the lens barrel, the image-side surface S2 of the first lens is in contact with the object-side surface S3 of the second lens, and the image-side surface S14 of the seventh lens is spaced apart from the lens barrel. The contact and abutment methods of the other spacer elements are the same as in Embodiments 1-1, and can be referred to the relevant descriptions in Embodiments 1-1, which will not be repeated here.

[0112] In summary, the structural parameters of the optical lens of Embodiment 2 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 9.

[0113] In Embodiment 2, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is concave, and its image-side surface S6 is convex. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The sixth lens E6 has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex. The seventh lens E7 has negative optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave. In Table 4, OBJ (not shown in the figure) is the object plane of the optical lens, and STO (not shown in the figure) is the aperture stop, which is located between the third lens and the fourth lens.

[0114] Table 4 shows the basic structural parameters of the optical lens in Embodiment 2, where the units for radius of curvature and thickness are millimeters (mm).

[0115]

[0116]

[0117] Table 4

[0118] Table 5 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, and A18 that can be used for each aspherical mirror S3-S14 in Example 2. Among them, each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0119] Face number A4 A6 A8 A10 A12 A14 A16 A18 S3 3.7795E-03 -1.5668E-02 5.8231E-03 -2.0263E-03 6.7829E-04 -1.1994E-04 8.0547E-06 0.0000E+00 S4 -3.3079E-03 -3.8440E-03 1.0935E-03 -2.7988E-04 7.3357E-04 -3.2617E-04 5.1696E-05 0.0000E+00 S7 -4.9225E-03 1.3179E-03 -1.8396E-02 2.6471E-02 -2.2399E-02 9.5075E-03 -1.7232E-03 0.0000E+00 S8 -3.3293E-02 -4.3991E-02 8.6676E-02 -7.8864E-02 4.1074E-02 -1.1627E-02 1.3541E-03 0.0000E+00 S9 -4.6414E-02 -5.3569E-02 7.5645E-02 -5.5500E-02 2.4517E-02 -6.0451E-03 5.8553E-04 0.0000E+00 S10 4.5235E-02 -7.1304E-02 6.8017E-02 -4.0790E-02 1.5835E-02 -3.5680E-03 3.5556E-04 0.0000E+00 S11 -1.4536E-02 1.6401E-02 -1.2117E-02 5.0465E-03 -1.0112E-03 -2.4096E-04 1.5926E-04 -2.3823E-05 S12 -1.6463E-02 1.7300E-02 -8.8270E-03 4.4613E-03 -1.5289E-03 2.9265E-04 -2.8899E-05 1.1545E-06 S13 -7.2211E-02 1.3988E-02 -2.5541E-03 4.0515E-04 -3.1761E-05 -3.4832E-07 2.0599E-07 -9.2295E-09 S14 -6.3617E-02 1.5784E-02 -3.5077E-03 5.8421E-04 -6.8050E-05 5.1243E-06 -2.2306E-07 4.2470E-09

[0120] Table 5

[0121] Figure 11 The on-axis chromatic aberration curve of the optical lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical lens. Figure 12 The astigmatism curve of the optical lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 13 The magnification chromatic aberration curve of the optical lens of Embodiment 2 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens.

[0122] according to Figures 11 to 13 It can be seen that the optical lens given in Example 2 can achieve good imaging quality.

[0123] Example 3

[0124] like Figures 14 to 19 As shown, the optical lens of Embodiment 3 is described. Figure 14 A schematic diagram of the optical lens of Embodiment 1-1 is shown. Figure 15 A schematic diagram of the optical lens structure of Embodiments 1-2 is shown. Figure 16 A schematic diagram of the optical lens structure of Embodiments 1-3 is shown.

[0125] like Figures 14 to 16 As shown, the optical lens includes a lens barrel, seven lenses, and multiple spacer elements. The lens barrel includes 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, arranged sequentially from the object side to the image side.

[0126] like Figure 14The diagram shows a schematic of the optical lens structure of Embodiment 1-1. In this example, the object-side surface S1 of the first lens is in contact with the lens barrel. The object-side surface and image-side surface of the first spacer element are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer element are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer element are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively; the object-side surface and image-side surface of the fourth spacer element are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively; the object-side surface and image-side surface of the fifth spacer element are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively; the object-side surface and image-side surface of the sixth spacer element are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively; and the image-side surface S14 of the seventh lens is spaced apart from the lens barrel.

[0127] like Figure 15 The diagram shown is a structural schematic of the optical lens of Embodiment 1-2. In this example, the bearing and contact method of each spacer element is the same as that of Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0128] like Figure 16 The diagram shown is a structural schematic of the optical lens in Embodiments 1-3. In this example, the bearing and contact method of each spacer element is the same as in Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0129] In summary, the structural parameters of the optical lens of Embodiment 3 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 9.

[0130] In Embodiment 3, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The sixth lens E6 has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex. The seventh lens E7 has negative optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave. In Table 6, OBJ (not shown in the figure) is the object plane of the optical lens, and STO (not shown in the figure) is the aperture stop, which is located between the third lens and the fourth lens.

[0131] Table 6 shows the basic structural parameters of the optical lens in Embodiment 3, where the units for radius of curvature and thickness are millimeters (mm).

[0132]

[0133]

[0134] Table 6

[0135] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S3-S14 in Example 3. Among them, each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0136] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 -7.9352E-03 1.8399E-03 -6.1117E-04 -4.1246E-04 3.2477E-04 -7.0631E-05 5.0971E-06 0.0000E+00 0.0000E+00 S4 9.0352E-03 3.8759E-03 -3.2769E-04 -7.7599E-04 -4.7200E-05 1.7041E-04 -2.1768E-05 0.0000E+00 0.0000E+00 S5 2.5308E-03 -1.8117E-03 4.0851E-04 -9.1894E-04 1.4815E-04 8.2578E-05 -1.8915E-05 0.0000E+00 0.0000E+00 S6 1.2121E-03 -6.5201E-03 9.5601E-03 -1.1730E-02 8.7772E-03 -3.4149E-03 5.3338E-04 0.0000E+00 0.0000E+00 S7 9.8354E-03 -7.6998E-03 2.3842E-03 1.4877E-03 -2.9275E-03 1.5079E-03 -2.5517E-04 0.0000E+00 0.0000E+00 S8 -3.3692E-02 1.6473E-02 -2.9271E-02 2.8564E-02 -1.4735E-02 3.9847E-03 -3.7489E-04 0.0000E+00 0.0000E+00 S9 -4.5937E-02 1.5957E-02 -4.1940E-02 4.2113E-02 -2.3622E-02 7.4908E-03 -9.8858E-04 0.0000E+00 0.0000E+00 S10 2.4050E-02 -1.1576E-02 -1.8747E-03 5.9410E-03 -3.2917E-03 8.8241E-04 -9.6414E-05 0.0000E+00 0.0000E+00 S11 -1.9416E-02 1.2207E-02 -3.9116E-03 1.2285E-04 5.7968E-04 -3.0649E-04 6.7597E-05 -5.8577E-06 0.0000E+00 S12 -1.5587E-02 5.5978E-03 6.8516E-04 -1.0117E-03 4.5350E-04 -9.8485E-05 1.0047E-05 -3.8688E-07 0.0000E+00 S13 -5.1906E-02 7.2867E-03 -1.8324E-03 7.4092E-04 -2.2177E-04 4.0925E-05 -4.3565E-06 2.4494E-07 -5.6519E-09 S14 -4.2473E-02 7.0609E-03 -1.1443E-03 1.5219E-04 -1.5900E-05 1.1684E-06 -5.4322E-08 1.3608E-09 -1.2421E-11

[0137] Table 7

[0138] Figure 17 The on-axis chromatic aberration curve of the optical lens of Embodiment 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical lens. Figure 18 The astigmatism curve of the optical lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 19 The magnification chromatic aberration curve of the optical lens of Embodiment 3 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens.

[0139] according to Figures 17 to 19 It can be seen that the optical lens given in Example 3 can achieve good imaging quality.

[0140] In summary, the optical lenses of Embodiments 1 to 3 respectively satisfy the relationships shown in Table 8.

[0141]

[0142]

[0143] Tables 8 and 9 show some parameters (unit: mm) of the optical lenses of Examples 1 to 3.

[0144]

[0145]

[0146] Table 9

[0147] 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 lens described above.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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 lens, characterized in that, It includes a lens barrel and a lens assembly and a spacer assembly located within the lens barrel. The lens group consists of seven lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side along the optical axis. The first lens has negative optical power and its object side is convex. The third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has negative optical power, the sixth lens has positive optical power, the seventh lens has negative optical power, and the image side of the seventh lens is concave. The spacer group includes at least a second spacer element, which is located between the second lens and the third lens and contacts the image-side portion of the second lens; The maximum effective radius DT11 of the object side of the first lens, the maximum effective radius DT12 of the image side of the first lens, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 1.65≤(DT11-DT12) / CT1≤2.06; The combined focal length f12 of the first lens and the second lens and the inner diameter d2s of the object side of the second spacer element satisfy the following condition: -1.64≤f12 / d2s≤-1.

18.

2. The optical lens according to claim 1, characterized in that, The following conditions must be met: 1.27≤EP02 / (T12+CT2)≤2.15 between the object-side end face of the lens barrel to the object-side side face of the second spacer element along the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis.

3. The optical lens according to claim 1, characterized in that, The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d2s of the object side of the second spacer element, and the axial distance SAG12 between the intersection of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens satisfy the following: -0.58≤f1 / f2*(d2s / SAG12) ≤1.

26.

4. The optical lens according to claim 1, characterized in that, The third lens has positive optical power, and the effective focal length f3 of the third lens, the inner diameter d2m of the image side of the second spacer element, and the refractive index N3 of the third lens satisfy the following condition: 2.62≤f3 / d2m*N3≤4.

62.

5. The optical lens according to claim 1, characterized in that, The spacer group further includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image-side surface of the third lens. The spacer distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element along the optical axis and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 3.32≤EP23 / T23≤8.

24.

6. The optical lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image-side surface of the third lens. The center thickness CT3 of the third lens on the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy the following condition: 0.98≤CT3 / CT4≤1.81; The central thickness CT4 of the fourth lens on the optical axis and the outer diameter D3s of the object side of the third spacer element satisfy the following condition: 6.36≤D3s / CT4≤8.

88.

7. The optical lens according to any one of claims 1 to 6, characterized in that, The spacer element group further includes a fourth spacer element and a fifth spacer element. The fourth spacer element is located between the fourth lens and the fifth lens and contacts the image-side surface of the fourth lens. The fifth spacer element is located between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The spacing distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis and the center thickness CT5 of the fifth lens along the optical axis satisfy the following: 3.15≤EP45 / CT5≤3.

40.

8. The optical lens according to any one of claims 1 to 6, characterized in that, The spacer element group further includes a fourth spacer element and a fifth spacer element. The fourth spacer element is located between the fourth lens and the fifth lens and contacts the image-side surface of the fourth lens. The fifth spacer element is located between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The outer diameter D4m of the image-side surface of the fourth spacer element, the outer diameter D5s of the object-side surface of the fifth spacer element, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy the following: 2.1≤(D5s / D4m)*(CT6 / CT5)≤3.

77.

9. The optical lens according to any one of claims 1 to 6, characterized in that, The spacer element group further includes a fifth spacer element and a sixth spacer element. The fifth spacer element is located between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The sixth spacer element is located between the sixth lens and the seventh lens and contacts the image-side surface of the sixth lens. The inner diameter d5m of the image-side surface of the fifth spacer element, the inner diameter d6s of the object-side surface of the sixth spacer element, and the maximum effective radius DT62 of the image-side surface of the sixth lens satisfy the following condition: 0.52≤(d6s-d5m) / DT62≤0.

88.

10. The optical lens according to any one of claims 1 to 6, characterized in that, The spacer element group further includes a fifth spacer element and a sixth spacer element. The fifth spacer element is located between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The sixth spacer element is located between the sixth lens and the seventh lens and contacts the image-side surface of the sixth lens. The spacing distance EP56 between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element along the optical axis, and the air gap T56 between the fifth lens and the sixth lens along the optical axis, satisfy the following: 0.31≤T56 / EP56≤0.

81.

11. The optical lens according to any one of claims 1 to 6, characterized in that, The spacer group further includes a sixth spacer element, which is located between the sixth lens and the seventh lens and contacts the image-side surface of the sixth lens. The inner diameter d6s of the object-side surface of the sixth spacer element and the distance YC62 from the inflection point of the effective diameter of the image-side surface of the sixth lens away from the optical axis satisfy the following condition: 2.32≤d6s / Yc62≤2.

84.

12. The optical lens according to any one of claims 1 to 6, characterized in that, The seventh lens has negative optical power. The spacer group also includes a sixth spacer element, which is located between the sixth lens and the seventh lens and contacts the image-side surface of the sixth lens. The effective focal length f7 of the seventh lens, the outer diameter D6s of the object-side surface of the sixth spacer element, and the inner diameter d6s of the object-side surface of the sixth spacer element satisfy the following: -3.45≤f7 / (D6s-d6s)≤-2.

04.

13. The optical lens according to any one of claims 1 to 6, characterized in that, The spacer element group further includes a sixth spacer element, which is located between the sixth lens and the seventh lens and contacts the image-side surface of the sixth lens. The combined focal length f56 of the fifth lens and the sixth lens, and the inner diameter d6m of the image-side surface of the sixth lens satisfy: -2.11 <f56 / d6m≤-1.12。

Images