Optical lens

Abstract

The application provides an optical lens. The optical lens comprises a first group, a second group and a subsequent element arranged in sequence along the optical axis direction of the optical lens from the object side to the image side, the first group at least comprising a first lens, a first spacer element and a second lens accommodated in a first lens barrel; the radius of curvature R2 of the image side surface of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy: -17.17<=R2 / R1<=-10.22; the radius of curvature R3 of the object side surface of the second lens and the inner diameter d1m of the image side surface of the first spacer element satisfy: -15.86<=R3 / d1m<=-2.88. The application solves the problem that in the prior art, non-imaging light passes through the edge of the optical effective diameter area of the second lens into the rear system, resulting in poor imaging quality.

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 iterative upgrades of smartphone optical lenses, manufacturers are increasingly demanding higher imaging performance from their lenses.

[0003] Currently, the object side of the first lens in some four-element optical lenses has a strong ability to deflect light, causing some non-imaging light rays to enter the first lens. The first lens converges these non-imaging light rays, causing the incident angle of these non-imaging light rays to approach the maximum receiving angle of the optical effective diameter area of ​​the second lens. As a result, these rays pass through the edge of the optical effective diameter area of ​​the second lens, forming stray light and aberrations that interfere with normal imaging, thus affecting the imaging quality of the optical lens.

[0004] In other words, existing optical lenses suffer from poor image quality because non-imaging rays pass through the edge of the effective optical diameter of the second lens and enter the rear system. Summary of the Invention

[0005] The main objective of this invention is to provide an optical lens that solves the problem in the prior art where non-imaging light rays pass through the edge of the effective optical diameter region of the second lens and enter the rear system, resulting in poor image quality.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical lens is provided, comprising four lenses. The optical lens includes a first group, a second group, and subsequent elements arranged sequentially from the object side to the image side along the optical axis of the optical lens. The first group includes only two lenses, the second group includes only two lenses, and the subsequent elements are reflective or transmissive elements. The first group includes a first lens barrel and a first lens, a first spacer element, and a second lens disposed within the first lens barrel. The first spacer element is located between the first lens and the second lens and contacts the image-side surface of the first lens. The radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R1 of the object-side surface of the first lens satisfy the following: -17.17 ≤ R2 / R1 ≤ -10.22. The radius of curvature R3 of the object-side surface of the second lens and the inner diameter d1m of the image-side surface of the first spacer element satisfy the following: -15.86 ≤ R3 / d1m ≤ -2.88.

[0007] According to another aspect of the present invention, an optical lens is provided, comprising four lenses. The optical lens includes a first group, a second group, and subsequent elements arranged sequentially from the object side to the image side along the optical axis of the optical lens. The first group includes only two lenses, the second group includes only two lenses, and the subsequent elements are reflective or transmissive elements. The first group includes a first lens barrel and a first lens, a first spacer element, and a second lens disposed within the first lens barrel. The first lens has positive optical power, and the first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens. The radius of curvature R2 of the image side surface of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy the following: -17.17≤R2 / R1≤-10.22. The effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis of the optical lens, and the distance EP101 between the object side end face of the first lens barrel and the object side surface of the first spacer element along the optical axis satisfy the following: 1.73≤f1 / (CT1+EP101)≤2.13.

[0008] According to another aspect of the present invention, an optical lens is provided, comprising four lenses. The optical lens includes a first group, a second group, and a reflecting element arranged sequentially from the object side to the image side along the optical axis of the optical lens. The first group includes only two lenses, and the second group includes only two lenses. The first group includes a first lens barrel and a first lens, a first spacer element, and a second lens housed within the first lens barrel. The first spacer element is located between the first lens and the second lens and contacts the image-side surface of the first lens. The radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R1 of the object-side surface of the first lens satisfy the following condition: -17.17 ≤ R2 / R1 ≤ -10.22. The radius of curvature R2 of the image-side surface of the first lens, the inner diameter d1s of the object-side surface of the first spacer element, and the inner diameter d10s of the object-side end face of the first lens barrel satisfy the following condition: -1.65 mm. -1 ≤R2 / d1s / d10s≤-1.06mm -1 .

[0009] Furthermore, the distance EP101 between the object-side end face of the first lens barrel and the object-side surface of the first spacer element along the optical axis, and the on-axis distance SAG11 between the intersection of the object-side surface of the first lens and the optical axis of the optical lens and the vertex of the effective radius of the object-side surface of the first lens, satisfy the following: 1.66≤EP101 / SAG11≤2.11.

[0010] Furthermore, the air gap T12 between the image side of the first lens and the object side of the second lens on the optical axis of the optical lens, and the maximum thickness CP1 of the first spacer element in the optical axis direction, satisfy the following: 2.42≤T12 / CP1≤6.12.

[0011] Furthermore, the first lens has positive optical power, the second lens has positive optical power, and the maximum height L10 of the first lens barrel and the combined focal length f12 of the first and second lenses satisfy the following condition: 1.80≤f12 / L10≤2.45.

[0012] Furthermore, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis of the optical lens, and the distance EP101 between the object-side end face of the first lens barrel and the object-side surface of the first spacer element along the optical axis direction satisfy the following: 1.73≤f1 / (CT1+EP101)≤2.13.

[0013] Furthermore, the radius of curvature R1 of the object side surface of the first lens, the outer diameter D10s of the object side end face of the first lens barrel, and the inner diameter d10s of the object side end face of the first lens barrel satisfy the following condition: 4.14≤R1 / (D10s-d10s)≤14.52.

[0014] Furthermore, the radius of curvature R2 of the image side of the first lens, the outer diameter D1s of the object side of the first spacer element, and the inner diameter d1s of the object side of the first spacer element satisfy the following: -36.67≤R2 / (D1s-d1s)≤-21.09.

[0015] Furthermore, the second group includes a second lens barrel and a third lens, a third spacer element, and a fourth lens housed within the second lens barrel. The third spacer element is located between the third lens and the fourth lens and contacts the image-side portion of the third lens. The second group is movable along the optical axis.

[0016] Furthermore, the radius of curvature R4 of the image side of the second lens, the inner diameter d20s of the object side end face of the second lens tube, and the refractive index N2 of the second lens satisfy the following condition: -10.41≤R4×N2 / d20s≤-4.04.

[0017] Furthermore, the central thickness CT3 of the third lens on the optical axis of the optical lens, the refractive index N3 of the third lens, and the distance EP203 between the object-side end face of the second lens barrel and the object-side surface of the third spacer element along the optical axis satisfy the following: 0.60≤CT3×N3 / EP203≤1.00.

[0018] Furthermore, the third lens has negative optical power, the image-side surface of the third lens is concave, and the radius of curvature R6 of the image-side surface of the third lens and the effective focal length f3 of the third lens satisfy the following condition: -2.66≤R6 / f3≤-0.59.

[0019] Furthermore, the outer diameter D20m of the image-side end face of the second lens tube, the inner diameter d20m of the image-side end face of the second lens tube, the outer diameter D3s of the object-side side face of the third spacer element, and the inner diameter d3s of the object-side side face of the third spacer element satisfy the following condition: 0.14≤(D20m-d20m) / (D3s-d3s)≤1.50.

[0020] Furthermore, the following conditions must be met: 1.61≤L20 / (SAG32+SAG41)≤4.24. The following conditions must be met:

[0021] Furthermore, the object-side surface of the fourth lens is convex, and the radius of curvature R8 of the image-side surface of the fourth lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy the following condition: 0.86≤|R8 / R7|≤1.67.

[0022] Furthermore, the third lens has negative optical power, and the combined focal length f34 of the third and fourth lenses and the maximum height L20 of the second lens barrel satisfy the following condition: -5.36≤f34 / L20≤-3.12.

[0023] Furthermore, the reflecting element is an isosceles trapezoidal prism.

[0024] Furthermore, the optical lens satisfies at least one of the following: the reflecting element is an isosceles trapezoidal prism; the reflecting element has a microstructure.

[0025] According to the technical solution of this invention, the optical lens is composed of four lenses. The optical lens includes a first group, a second group, and subsequent elements arranged sequentially from the object side to the image side along the optical axis of the optical lens. The first group includes only two lenses, the second group includes only two lenses, and the subsequent elements are reflective or transmissive elements. The first group includes a first lens barrel and a first lens, a first spacer element, and a second lens housed within the first lens barrel. The first spacer element is located between the first lens and the second lens and is in contact with the image side surface of the first lens. The radius of curvature R2 of the image side surface of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy the following: -17.17≤R2 / R1≤-10.22. The radius of curvature R3 of the object side surface of the second lens and the inner diameter d1m of the image side surface of the first spacer element satisfy the following: -15.86≤R3 / d1m≤-2.88.

[0026] The optical lens of this application consists of a first group, a second group, and a reflective element, and satisfies -17.17≤R2 / R1≤-10.22. This indicates that the object-side surface of the first lens has a strong refractive power, causing some non-imaging rays to enter the first lens. The first lens converges on these rays, resulting in their incident angle being close to the maximum receiving angle of the second lens's optical effective diameter region. This causes the non-imaging rays to pass through the edge of the second lens's optical effective diameter region, forming stray light and aberrations that interfere with normal imaging, thus affecting the image quality of the optical lens. Based on this, this application constrains the ratio of the curvature radius R3 of the object-side surface of the second lens to the inner diameter d1m of the image-side surface of the first spacer element within a reasonable range. By adjusting the curvature radius of the object-side surface of the second lens and the inner diameter of the first spacer element appropriately, while ensuring the refractive power of the object-side surface of the second lens, the first spacer element can effectively intercept non-imaging rays entering the edge of the second lens's optical effective diameter region, avoiding the risk of further stray light formation and thus ensuring the image quality of the optical lens. In other words, the optical lens of this application effectively improves the imaging quality by constraining R3 / d1m within a reasonable range. Attached Figure Description

[0027] 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:

[0028] Figure 1 A dimensioned diagram of an optical lens according to an alternative embodiment of the present invention is shown;

[0029] Figure 2 A structural diagram of an optical lens according to an alternative embodiment of the present invention is shown;

[0030] Figure 3 and Figure 4 The following are partial structural schematic diagrams of the optical lens in the telephoto state and the macro state of Embodiment 1-1 of the present invention, respectively.

[0031] Figure 5 and Figure 6 The following are partial structural schematic diagrams of the optical lenses of Embodiments 1-2 of the present invention in telephoto mode and in macro mode, respectively.

[0032] Figure 7 , Figure 8 , Figure 9 and Figure 10 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical lens in the telephoto state of Embodiment 1 of the present invention are shown respectively.

[0033] Figure 11 , Figure 12 , Figure 13 and Figure 14 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical lens of Embodiment 1 of the present invention are shown respectively in macro mode.

[0034] Figure 15 and Figure 16 The following are partial structural schematic diagrams of the optical lens in the telephoto state and the macro state of Embodiment 2-1 of the present invention, respectively.

[0035] Figure 17 and Figure 18 The following are partial structural schematic diagrams of the optical lens in the telephoto state and the macro state of Embodiment 2-2 of the present invention, respectively.

[0036] Figure 19 , Figure 20 , Figure 21 and Figure 22 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical lens in the telephoto state of Embodiment 2 of the present invention are shown respectively.

[0037] Figure 23 , Figure 24 , Figure 25 and Figure 26 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical lens of Embodiment 2 of the present invention are shown respectively in macro mode.

[0038] Figure 27 and Figure 28 The following are partial structural schematic diagrams of the optical lens in the telephoto state and the macro state of Embodiment 3-1 of the present invention, respectively.

[0039] Figure 29 and Figure 30 The following are partial structural schematic diagrams of the optical lens in the telephoto state and the macro state of Embodiments 3-2 of the present invention, respectively.

[0040] Figure 31 , Figure 32 , Figure 33 and Figure 34 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical lens of Embodiment 3 of the present invention are shown respectively in the telephoto state.

[0041] Figure 35 , Figure 36 , Figure 37 and Figure 38The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical lens of Embodiment 3 of the present invention are shown respectively in macro mode.

[0042] Figure 39 and Figure 40 The following are partial structural schematic diagrams of the optical lens in the telephoto state and the macro state of Embodiment 4-1 of the present invention, respectively.

[0043] Figure 41 and Figure 42 The following are partial structural schematic diagrams of the optical lens in the telephoto state and the macro state of Embodiment 4-2 of the present invention, respectively.

[0044] Figure 43 , Figure 44 , Figure 45 and Figure 46 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical lens in the telephoto state of Embodiment 4 of the present invention are shown respectively.

[0045] Figure 47 , Figure 48 , Figure 49 and Figure 50 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical lens of Embodiment 4 of the present invention are shown respectively in macro mode.

[0046] Figure 51 and Figure 52 The optical path diagram and stray light spot diagram of an optical lens according to an optional embodiment of the present invention are shown respectively;

[0047] Figure 53 and Figure 54 The optical path diagram and stray light spot diagram of an example optical lens are shown respectively;

[0048] Figure 55 and Figure 56 The optical path diagram and stray light spot diagram of another example optical lens are shown respectively.

[0049] The above figures include the following reference numerals:

[0050] D1, First group; D2, Second group; D3, Reflecting element; P10, First lens barrel; P20, Second lens barrel; E1, First lens; P1, First spacer element; E2, Second lens; E3, Third lens; P3, Third spacer element; E4, Fourth 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; S6, Object-side surface of the third lens; S7, Image-side surface of the third lens; S8, Object-side surface of the fourth lens; S9, Image-side surface of the fourth lens. Detailed Implementation

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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 database of 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.

[0057] To address the problem in existing optical lenses where non-imaging rays pass through the edge of the effective optical diameter region of the second lens and enter the rear system, resulting in poor image quality, this invention provides an optical lens.

[0058] like Figures 1 to 52 As shown, the optical lens consists of four lenses. The optical lens includes a first group D1, a second group D2, and subsequent elements arranged sequentially from the object side to the image side along the optical axis of the lens. The first group D1 includes only two lenses, the second group D2 includes only two lenses, and the subsequent element is a reflective element D3. The first group D1 includes a first lens barrel and a first lens, a first spacer element, and a second lens housed within the first lens barrel. The first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens. The radius of curvature R2 of the image side surface of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy the following condition: -17.17≤R2 / R1≤-10.22. The radius of curvature R3 of the object side surface of the second lens and the inner diameter d1m of the image side surface of the first spacer element satisfy the following condition: -15.86≤R3 / d1m≤-2.88.

[0059] The optical lens of this application consists of a first group D1, a second group D2, and a reflective element D3, satisfying -17.17≤R2 / R1≤-10.22. This indicates that the object-side surface of the first lens has a strong refractive power, causing some non-imaging rays to enter the first lens. The first lens converges these rays, resulting in their incident angle being close to the maximum receiving angle of the second lens's optical effective diameter region. This causes the non-imaging rays to pass through the edge of the second lens's optical effective diameter region, forming stray light and aberrations that interfere with normal imaging, thus affecting the image quality of the optical lens. Based on this, this application constrains the ratio of the curvature radius R3 of the object-side surface of the second lens to the inner diameter d1m of the image-side surface of the first spacer element within a reasonable range. By adjusting the curvature radius of the object-side surface of the second lens and the inner diameter of the first spacer element appropriately, while ensuring the refractive power of the object-side surface of the second lens, the first spacer element can effectively intercept non-imaging rays entering the edge of the second lens's optical effective diameter region, avoiding the risk of further stray light formation and thus ensuring the image quality of the optical lens. In other words, the optical lens of this application effectively improves the imaging quality by constraining R3 / d1m within a reasonable range.

[0060] Optionally, the reflective element D3 can be replaced with a parallel plate, which facilitates the design of the optical lens. Specifically, the reflective element D3 and the vignetting stop behind it can be replaced with a parallel plate.

[0061] Alternatively, the subsequent element can be a transmission element, such as a parallel plate.

[0062] In addition, refer to Figures 51 to 56 As shown, assuming the optical lens satisfies -17.17 ≤ R2 / R1 ≤ -10.22, for example, R2 / R1 = -17.17, Figure 51 and Figure 52 The optical path diagram and stray light spot diagram of an optical lens according to an optional embodiment of the present invention are shown respectively. Specifically, the optical lens in this embodiment satisfies R3 / d1m=-2.93, and this embodiment is referred to as Scheme 1. Figure 53 and Figure 54 The optical path diagram and stray light spot diagram of an example optical lens are shown respectively. Specifically, the optical lens in this example satisfies R3 / d1m = -16.30. This example is referred to as Example 1. Figure 55 and Figure 56 The optical path diagram and stray light spot diagram of another example optical lens are shown respectively. Specifically, the optical lens in this example satisfies R3 / d1m = -2.66, and this example is referred to as Example 2.

[0063] like Figure 51As shown, when the optical lens satisfies R3 / d1m = -2.93, the inner diameter of the first spacer element is reasonably set, enabling the first spacer element to intercept non-imaging rays entering the edge of the effective optical diameter region of the second lens. Combined with... Figure 52 As shown, there are very few stray light spots on the imaging surface of the optical lens, indicating that the optical lens of Scheme 1 performs better.

[0064] like Figure 53 As shown, when the optical lens satisfies R3 / d1m = -16.30, the inner diameter of the first spacer element is small, resulting in an excessively long radial length of the first spacer element. This leads to excessive interception of the imaging light rays used for imaging. In this case, part of the imaging light rays is completely blocked, while the other part, based on diffraction theory, bypasses the first spacer element and continues to propagate, forming diffraction stray light. Combined with... Figure 54 As shown, the stray light spots on the imaging plane of the optical lens are severe, indicating that the optical lens of Example 1 performs poorly.

[0065] like Figure 55 As shown, when the optical lens satisfies R3 / d1m = -2.66, the inner diameter of the first spacer element is too large, resulting in an excessively short radial length. This allows non-imaging rays from the first lens to completely pass through the second lens, causing light leakage. Combined with... Figure 56 As shown, there are many stray light spots on the imaging surface of the optical lens, indicating that the optical lens of Example 2 performs poorly.

[0066] In summary, as Figures 51 to 56 As shown, when the optical lens satisfies -17.17 ≤ R2 / R1 ≤ -10.22 and ensures that R3 / d1m is within the range of -15.86 to -2.88, the stray light spots on the imaging surface of the optical lens are minimal, resulting in the best imaging quality. This indicates that the optical lens of Embodiment 1 performs optimally. Therefore, by constraining R2 / R1 and R3 / d1m within a reasonable range, this application adjusts the radius of curvature of the object-side surface of the second lens and the inner diameter of the first spacer element appropriately. While ensuring the refractive power of the object-side surface of the second lens, it enables the first spacer element to effectively intercept non-imaging light rays entering the edge of the effective optical diameter region of the second lens, avoiding the risk of further stray light formation from non-imaging light rays, thereby ensuring the imaging quality of the optical lens. In other words, the optical lens of this application effectively improves the imaging quality by constraining R3 / d1m within a reasonable range.

[0067] It should be noted that this application constrains R3 / d1m within a reasonable range, effectively avoiding light leakage and thus ensuring the imaging quality of the optical lens. This is not dependent on the optical power and surface shape of other lenses, which are further optimizations of the optical lens based on this constraint. The other lenses can be positive or negative depending on the actual design requirements of the optical lens, and their surface shapes can also be convex or concave. The optical lens can guarantee imaging quality when -17.17≤R2 / R1≤-10.22 and -15.86≤R3 / d1m≤-2.88.

[0068] For example, in some optional embodiments, the first lens has positive optical power, which can effectively converge light rays and ensure that the light rays are focused after entering the first lens. In other optional embodiments, the second lens has positive optical power, further enhancing the light-converging effect. In yet another optional embodiment, the third lens has negative optical power, balancing the aberrations introduced by the previous lens group and enabling accurate image formation. In yet another optional embodiment, the object-side and image-side of the first lens are convex. The object-side and image-side of the second lens are concave. The image-side of the third lens is concave. The object-side of the fourth lens is convex. By reasonably constraining the surface shape of each lens, it is beneficial to reasonably constrain the light trajectory, ensure a smooth light transition, and facilitate the correction of aberrations.

[0069] In some optional embodiments, the distance EP101 between the object-side end face of the first lens barrel and the object-side surface of the first spacer element along the optical axis, and the axial distance SAG11 between the intersection of the object-side surface of the first lens and the optical axis of the optical lens and the vertex of the effective radius of the object-side surface of the first lens, satisfy the following: 1.66 ≤ EP101 / SAG11 ≤ 2.11. EP101 determines the reserved size between the object-side end face of the first lens barrel and the first spacer element, while SAG11 reflects the degree of protrusion of the object-side surface of the first lens towards the object side. Therefore, by controlling the ratio of EP101 / SAG11 within a reasonable range, not only can sufficient structural strength of the first lens barrel be ensured, but also an appropriate gap can be maintained between the optical effective diameter area of ​​the first lens and the object-side end of the first lens barrel during assembly, preventing excessive contact and thus avoiding appearance risks such as scratches caused by the outward protrusion of the first lens. In addition, constraining the above formula within a reasonable range can also ensure the uniformity of the surface shape of the first lens, which helps to improve the machinability of the first lens and thus reduce the molding risk of the first lens.

[0070] In some optional embodiments, the air gap T12 between the image-side surface of the first lens and the object-side surface of the second lens on the optical axis of the lens, and the maximum thickness CP1 of the first spacer element in the optical axis direction, satisfy the following condition: 2.42 ≤ T12 / CP1 ≤ 6.12. Since the distance between the first and second lenses in the first group D1 is small, it is necessary to control the minimum distance between the first and second lenses and the thickness of the first spacer element within a reasonable range by setting T12 / CP1, thus avoiding poor optical performance caused by contact between the first and second lenses during assembly. Simultaneously, constraining the above formula within a reasonable range can prevent baking deformation caused by excessively thin first spacer elements, reducing the risk of light leakage, and also prevent stray light problems caused by excessively thick first spacer elements, i.e., reducing stray light formed by excessive reflection or scattering of light on the inner ring surface of the first spacer element, thereby improving the imaging quality of the optical lens.

[0071] In some alternative embodiments, the first lens has positive optical power, the second lens has positive optical power, and the maximum height L10 of the first lens barrel and the combined focal length f12 of the first and second lenses satisfy the following condition: 1.80 ≤ f12 / L10 ≤ 2.45. By setting f12 / L10 within a reasonable range, it not only helps to optimize the direction and path of light within the first group D1, but also limits the size of the first lens barrel in the optical axis direction, achieving miniaturization of the optical lens. Furthermore, controlling the value of f12 / L10 can prevent collisions between the first group D1 and the second group D2 during the assembly or use of the optical lens, avoiding any impact on the optical lens.

[0072] In some optional embodiments, the first lens has positive optical power, and the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis of the optical lens, and the distance EP101 between the object-side end face of the first lens barrel and the object-side surface of the first spacer element along the optical axis satisfy the following: 1.73 ≤ f1 / (CT1+EP101) ≤ 2.13. By setting f1 / (CT1+EP101) within a reasonable range, it helps to control the effective focal length and surface uniformity of the first lens, improve the molding yield of the first lens, and ensure that the path of light passing through the first lens is more gentle. This, in turn, adjusts the focusing position of the light on the surface of the second lens after passing through the first lens, reduces the risk of stray light from the optical lens, and ensures the imaging quality of the optical lens. In addition, this also helps to maintain an appropriate gap between the first lens and the object-side end of the first lens barrel during assembly, avoiding scratches and other appearance problems caused by excessive contact, thereby ensuring good processing performance of the first lens and ensuring the assembly stability of the first lens.

[0073] In some optional embodiments, the radius of curvature R1 of the object-side surface of the first lens, the outer diameter D10s of the object-side end face of the first lens barrel, and the inner diameter d10s of the object-side end face of the first lens barrel satisfy the following condition: 4.14 ≤ R1 / (D10s-d10s) ≤ 14.52. By setting R1 / (D10s-d10s) within a reasonable range, the radial thickness design of the object-side end face of the first lens barrel can be made more reasonable, thereby improving the assembly bearing width of the object-side end of the first lens barrel, ensuring stability and reliability during the assembly process, and also helping the first lens maintain good optical performance.

[0074] In some alternative embodiments, the radius of curvature R2 of the image-side surface of the first lens, the outer diameter D1s of the object-side surface of the first spacer element, and the inner diameter d1s of the object-side surface of the first spacer element satisfy the following: -36.67 ≤ R2 / (D1s-d1s) ≤ -21.09. By setting R2 / (D1s-d1s) within a reasonable range, it helps to control the shape of the effective optical diameter region of the first lens, thereby controlling the radial dimension of the first lens within a reasonable range. Simultaneously, this also ensures that the first lens has sufficient flange width (i.e., the radial length of the structural portion of the first lens), improving the fabrication feasibility of the first lens and the fit between the first lens and the first spacer element, thereby enhancing the stability of the assembly between the first lens and the first spacer element.

[0075] In some optional embodiments, the second group D2 includes a second lens barrel and a third lens, a third spacer element, and a fourth lens housed within the second lens barrel. The third spacer element is located between the third and fourth lenses and contacts the image-side surface of the third lens. The second group D2 is movable along the optical axis. By combining the third and fourth lenses within the second group D2, the light path can be effectively adjusted, enabling the optical lens to meet the requirements of a large image plane. Simultaneously, the third spacer element can effectively avoid unnecessary stray light, improving the structural stability and reliability of the optical lens. The ability of the second group D2 to move along the optical axis ensures that the optical lens achieves the optimal imaging point in both telephoto and macro modes, greatly enriching the imaging characteristics of the optical lens.

[0076] In some optional embodiments, the image-side surface of the second lens is convex, and the radius of curvature R4 of the image-side surface of the second lens, the inner diameter d20s of the object-side end face of the second lens barrel, and the refractive index N2 of the second lens satisfy the following: -10.41≤R4×N2 / d20s≤-4.04. By setting R4×N2 / d20s within a reasonable range, it helps to optimize the surface shape of the second lens and its ability to control light, so that the effective light can smoothly transition from the second lens of the first group D1 to the second group D2, reducing energy loss and aberrations in the optical path. While ensuring the optical performance of the second lens, it is beneficial to improve the manufacturability of the second lens. In addition, it helps to limit the aperture size of the second group D2, reduce the overall size and weight of the optical lens, and thus help to ensure the miniaturization of the optical lens.

[0077] In some optional embodiments, the center thickness CT3 of the third lens on the optical axis, the refractive index N3 of the third lens, and the distance EP203 between the object-side end face of the second lens barrel and the object-side surface of the third spacer element along the optical axis satisfy the following: 0.60 ≤ CT3 × N3 / EP203 ≤ 1.00. By setting CT3 × N3 / EP203 within a reasonable range, the surface shape of the third lens and the light path through the third lens are ensured to be more reasonable, thereby improving the manufacturing feasibility of the third lens. At the same time, the position of the object-side end face of the second group D2 is controlled to avoid collision problems caused by the excessively small distance between the first group D1 and the second group D2.

[0078] In some alternative embodiments, the third lens has negative optical power, and its image-side surface is concave. The radius of curvature R6 of the image-side surface and the effective focal length f3 of the third lens satisfy the following condition: -2.66 ≤ R6 / f3 ≤ -0.59. By constraining the ratio of R6 / f3 to between -2.66 and -0.59, the refraction angle of light passing through the third lens can be controlled, reducing the degree of light deflection in the third lens, thereby reducing light deviation caused by refraction deviation (e.g., spherical aberration), ultimately reducing the sensitivity of the third lens and improving the imaging quality of the optical lens.

[0079] In some optional embodiments, the outer diameter D20m of the image-side end face of the second lens barrel, the inner diameter d20m of the image-side end face of the second lens barrel, the outer diameter D3s of the object-side surface of the third spacer element, and the inner diameter d3s of the object-side surface of the third spacer element satisfy the following: 0.14 ≤ (D20m - d20m) / (D3s - d3s) ≤ 1.50. By setting (D20m - d20m) / (D3s - d3s) within a reasonable range, the ratio of the annular width of the object-side surface of the second lens barrel to that of the object-side surface of the third spacer element is constrained. This not only helps to improve the forming strength and manufacturability of the second lens barrel, but also helps to optimize the size and position of the third spacer element, so that the third spacer element blocks stray light from the third lens, thereby improving the imaging quality of the optical lens.

[0080] In some optional embodiments, the maximum height L20 of the second lens barrel, the axial distance SAG32 between the intersection of the image-side surface of the third lens and the optical axis of the optical lens and the vertex of the effective radius of the image-side surface of the third lens, and the axial distance SAG41 between the intersection of the object-side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fourth lens satisfy the following condition: 1.61 ≤ L20 / (SAG32+SAG41) ≤ 4.24. By setting L20 / (SAG32+SAG41) within a reasonable range, it not only helps to ensure the good manufacturability of the third and fourth lenses, but also promotes a more compact second group D2, thereby effectively avoiding the risk of the second group D2 colliding with the first group D1 and the reflecting element D3 during movement.

[0081] In some optional embodiments, the object-side surface of the fourth lens is convex, and the radius of curvature R8 of the image-side surface and the radius of curvature R7 of the object-side surface of the fourth lens satisfy the following condition: 0.86 ≤ |R8 / R7| ≤ 1.67. By setting |R8 / R7| within a reasonable range, the surface shape of the fourth lens is controlled to be more reasonable, thereby effectively constraining the trend of light rays emitted from the fourth lens of the optical lens, making the light rays in the multi-wavelength range converge more concentrated, reducing the generation of chromatic aberration, and also ensuring the feasibility of the fourth lens manufacturing, thereby improving the reliability of the optical performance of the optical lens.

[0082] In some alternative embodiments, the third lens has a negative optical power, and the combined focal length f34 of the third and fourth lenses and the maximum height L20 of the second lens barrel satisfy the following condition: -5.36 ≤ f34 / L20 ≤ -3.12. By setting f34 / L20 within a reasonable range, the third and fourth lenses are ensured to have excellent refractive properties, allowing light to be transmitted reasonably to the imaging surface. This also helps to ensure the miniaturization of the second group D2 and avoids collisions between the second group D2 and the first group D1 or the reflective element D3 during movement.

[0083] In some alternative embodiments, the spacing between the first group D1 and the second group D2 is variable, and the zoom of the optical lens is achieved by changing the distance between the first group D1 and the second group D2.

[0084] In some alternative embodiments, such as Figure 2 As shown, the reflecting element D3 is a trapezoidal prism. In an optical lens, the reflecting element D3 can be a trapezoidal prism, a three-dimensional structure located on the image side of the optical lens. It reflects the light rays emitted through the fourth lens back to the imaging plane, where the light rays are rotated 180° and received by the inverted imaging chip. The trapezoidal prism increases the optical path of the optical lens, reducing its size while also increasing its effective focal length range. Specifically, the trapezoidal prism is a three-dimensional isosceles trapezoid, and its surface can be enhanced with microstructures to improve stray light. The top surface of the trapezoidal prism is located on the side of its base away from the second group D2.

[0085] It should be noted that the trapezoidal prism has a top surface, a bottom surface, and four side surfaces connected to the top and bottom surfaces. Light rays pass coaxially through the first group D1 and the second group D2. The central axes of the first group D1 and the second group D2 are both located on the first plane, as is the central axis of the imaging plane. The trapezoidal prism has two side surfaces parallel to the first plane. The other two side surfaces connected to the top and bottom surfaces serve as the waist surfaces of the trapezoidal prism.

[0086] Preferably, the reflecting element D3 is an isosceles trapezoidal prism.

[0087] In some alternative embodiments, the image height Imgh of the optical lens satisfies: 4.4mm < Imgh < 4.5mm. Wherein, Imgh(inf) represents the image height when the object distance (OBJ) is at infinity, which is also the image height in telephoto mode, and Imgh(200) represents the image height when the object distance (OBJ) is 200mm, which is also the image height in macro mode.

[0088] In some alternative embodiments, the half field of view (HFOV) of the optical lens satisfies: 13.65° < HFOV < 14.6°. Here, HFOV(inf) represents the half field of view when the object distance (OBJ) is at infinity, which is also the half field of view in telephoto mode, and HFOV(200) represents the half field of view when the object distance (OBJ) is 200mm, which is also the half field of view in macro mode.

[0089] In some alternative embodiments, the aperture value Fno of the optical lens satisfies: 2.85 < Fno < 3.0. Wherein, Fno(inf) represents the aperture value when the object distance (OBJ) is at infinity, which is also the aperture value in telephoto mode, and Fno(200) represents the aperture value when the object distance (OBJ) is 200mm, which is also the aperture value in macro mode.

[0090] In some optional embodiments, the effective focal length f of the optical lens satisfies: 15.4mm < f < 17.6mm. Here, f(inf) represents the effective focal length at infinity (OBJ), which is also the effective focal length in telephoto mode, and f(200) represents the effective focal length at 200mm (OBJ), which is also the effective focal length in macro mode. The effective focal length f of the optical lens enables continuous zoom within the range of 15.4mm to 17.6mm.

[0091] In another aspect, in another alternative embodiment, an optical lens is provided, which consists of four lenses. The optical lens includes a first group D1, a second group D2, and a reflecting element D3 arranged sequentially from the object side to the image side along the optical axis of the optical lens. The first group D1 includes only two lenses, and the second group D2 includes only two lenses. The first group D1 includes a first lens barrel and a first lens, a first spacer element, and a second lens housed within the first lens barrel. The first lens has positive optical power, and the first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens. The radius of curvature R2 of the image side surface of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy the following: -17.17≤R2 / R1≤-10.22. The effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis of the optical lens, and the distance EP101 between the object side end face of the first lens barrel and the object side surface of the first spacer element along the optical axis satisfy the following: 1.73≤f1 / (CT1+EP101)≤2.13.

[0092] The optical lens of this application consists of a first group D1, a second group D2, and a reflective element D3, and satisfies -17.17≤R2 / R1≤-10.22. This indicates a significant difference in the radii of curvature between the object-side and image-side surfaces of the first lens. Light passing through the first lens tends to enter the second lens at a steeper angle, increasing the risk of diffraction and stray light at the edge of the second lens, thus affecting the imaging quality of the optical lens. Therefore, this application constrains the relationship between the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis of the optical lens, and the distance EP101 between the object-side end face of the first lens barrel and the object-side surface of the first spacer element along the optical axis. This helps control the effective focal length and surface uniformity of the first lens, improving the forming yield of the first lens while ensuring a gentler path for light passing through it. This, in turn, adjusts the focusing position of the light on the surface of the second lens after passing through the first lens, reducing the risk of stray light and ensuring the imaging quality of the optical lens. Furthermore, this also helps maintain an appropriate gap between the first lens and the object-side end of the first lens barrel during assembly, avoiding scratches and other appearance problems caused by excessive contact, thereby ensuring good processing performance of the first lens while guaranteeing the assembly stability of the first lens. In other words, the optical lens of this application effectively improves the imaging quality of the optical lens by constraining f1 / (CT1+EP101) within a reasonable range.

[0093] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0094] In another aspect, in another alternative embodiment, an optical lens is provided, comprising four lenses. The optical lens includes a first group D1, a second group D2, and a reflecting element D3 arranged sequentially from the object side to the image side along the optical axis of the optical lens. The first group D1 includes only two lenses, and the second group D2 includes only two lenses. The first group D1 includes a first lens barrel and a first lens, a first spacer element, and a second lens housed within the first lens barrel. The first spacer element is located between the first lens and the second lens and contacts the image-side surface of the first lens. The radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R1 of the object-side surface of the first lens satisfy the condition: -17.17 ≤ R2 / R1 ≤ -10.22. The radius of curvature R2 of the image-side surface of the first lens, the inner diameter d1s of the object-side surface of the first spacer element, and the inner diameter d10s of the object-side end face of the first lens barrel satisfy the condition: -1.65 mm. -1 ≤R2 / d1s / d10s≤-1.06mm -1 .

[0095] The optical lens of this application consists of a first group D1, a second group D2, and a reflective element D3, and satisfies -17.17≤R2 / R1≤-10.22. It can be seen that the object side of the first lens has a strong ability to deflect light, causing some non-imaging light rays to enter the first lens. The first lens converges these light rays, causing the incident angle of these non-imaging light rays to be close to the maximum receiving angle of the optical effective diameter area of ​​the second lens. As a result, the non-imaging light rays pass through the edge of the optical effective diameter area of ​​the second lens, forming stray light and aberrations that interfere with normal imaging, thus affecting the imaging quality of the optical lens. Based on this, this application, by constraining the relationship between the radius of curvature R2 of the image-side surface of the first lens, the inner diameter d1s of the object-side surface of the first spacer element, and the inner diameter d10s of the object-side end face of the first lens barrel, can control the light rays to achieve appropriate convergence after passing through the image-side surface of the first lens, while ensuring the light incident range. This allows the light rays to pass smoothly through the first spacer element after passing through the first lens, avoiding the blocking of imaging light rays by the first spacer element and preventing non-imaging light rays from entering the edge of the optical effective diameter region of the second lens, thus avoiding the risk of non-imaging light rays further forming stray light and ensuring the imaging quality of the optical lens. In other words, the optical lens of this application effectively improves the imaging quality of the optical lens by constraining R2 / d1s / d10s within a reasonable range.

[0096] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0097] Optionally, the optical lens may also include a filter located between the imaging plane and the fourth lens.

[0098] Optionally, the aforementioned optical lens may also include protective glass for protecting the photosensitive element located on the imaging plane.

[0099] Optionally, the above-mentioned multiple lenses may include at least one tangent lens. The outer peripheral surface of the tangent lens may have a tangent portion and a non-tangent portion, and the outer diameter of the tangent portion of the lens is smaller than the outer diameter of the non-tangent portion of the lens. When the outer peripheral surface of the lens has a tangent portion, the outer diameter of the lens usually refers to the outer diameter of the non-tangent portion of the lens.

[0100] Optionally, at least one of the aforementioned multiple spacer elements may be a truncated spacer element. The outer peripheral surface of the truncated spacer element may have a truncated portion and a non-truncated portion, and the outer diameter of the truncated portion of the truncated spacer element is smaller than the outer diameter of the non-truncated portion of the truncated spacer element. The outer diameter of the spacer element usually refers to the maximum outer diameter of the non-truncated portion.

[0101] It should be noted that each lens consists of an effective optical diameter region at the center and an optical structure region at the edge. The optical structure region is located on the outer periphery of the effective optical diameter region and is arranged circumferentially around it. The effective optical diameter region is used for the passage of imaging light rays, while the optical structure region is not used for the passage of imaging light rays. The optical structure region is used to contact the lens barrel, adjacent lenses, or adjacent spacer elements. The optical structure region is also called the non-effective optical diameter region.

[0102] The optical lens in this application may employ multiple lenses, such as the four 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.

[0103] 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 four lenses have been described as an example in the embodiments, the optical lens is not limited to including four lenses. If necessary, the optical lens may also include other numbers of lenses.

[0104] Figure 1 A schematic diagram showing the dimensions of an optical lens according to this application is provided. Figure 1 The figures clearly indicate parameters such as EP101, EP203, CP1, L10, L20, d1s, d1m, D1s, d3s, D3s, d10s, D10s, d20s, d20m, D20m, SAG11, SAG32, and SAG41 to provide a clear and intuitive understanding of their meaning. To facilitate the description of optical lenses and specific lens shapes, these parameters will not be shown in the accompanying figures when describing specific embodiments.

[0105] It should be noted that, in the process of light traveling from the object being photographed to the imaging surface, along the direction of light transmission, the object side refers to the side of the optical element that receives the light, or, with the imaging element as the boundary, the side where the scene to be imaged is located along the direction of light transmission. The image side refers to the side of the optical element that emits light, or, with the imaging element as the boundary, the side where the image of the scene to be imaged is located along the direction of light transmission. The object-side end face of the lens barrel is the surface of the lens barrel located in front of the optical element in the direction of light transmission and perpendicular to the optical axis. The image-side end face of the lens barrel is the surface of the lens barrel located behind the optical element in the direction of light transmission and perpendicular to the optical axis. The object-side surface of the spacer element is the surface of the spacer element that contacts the optical element located in front of it and is perpendicular to the optical axis; the image-side surface of the spacer element is the surface of the spacer element that contacts the optical element located behind it and is perpendicular to the optical axis. In the direction of light transmission, among two adjacent optical elements, the light first passes through the optical element located in front and then through the optical element located behind.

[0106] It should be noted that the "axial distance" defined in SAG11, SAG32, and SAG41 specifically refers to the distance along the optical axis, also known as displacement. It is positive along the direction of light transmission and negative otherwise. L10 is the maximum height of the first lens tube, specifically the distance between the object-side end face and the image-side end face of the first lens tube along the optical axis. L20 is the maximum height of the second lens tube, specifically the distance between the object-side end face and the image-side end face of the second lens tube along the optical axis.

[0107] 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.

[0108] It should be noted that in the following Embodiment 1, there are Embodiments 1-1 and 1-2; in Embodiment 2, there are Embodiments 2-1 and 2-2; in Embodiment 3, there are Embodiments 3-1 and 3-2; and in Embodiment 4, there are Embodiments 4-1 and 4-2. In the two embodiments within the same embodiment, the curvature radius, center thickness, and other parameters of the first to fourth lenses, as well as the spacing distance and higher-order coefficients between the lenses, are the same. However, the thickness, inner diameter, and outer diameter of the first lens barrel, second lens barrel, first spacer element, and 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.

[0109] It should be noted that any of the embodiments described in Examples 1 to 4 below are applicable to all implementation methods of this application.

[0110] Example 1

[0111] like Figures 3 to 14As shown, the optical lens of Embodiment 1 is described. Figure 3 and Figure 4 The following are partial structural schematic diagrams of the optical lens in the telephoto and macro states of Embodiments 1-1 of the present invention, respectively. Figure 5 and Figure 6 The diagrams show partial structural schematics of the optical lenses in the telephoto and macro states of embodiments 1-2 of the present invention, respectively.

[0112] like Figures 3 to 6 As shown, the optical lens includes a first lens barrel P10, a second lens barrel 20, four lenses and multiple spacers. The first lens barrel P10 includes a first lens E1, a first spacer P1 and a second lens E2 arranged sequentially from the object side to the image side. The second lens barrel P20 includes a third lens E3, a third spacer P3 and a fourth lens E4 arranged sequentially from the object side to the image side.

[0113] like Figure 3 and Figure 4 The diagram shown is a partial structural schematic of the optical lens of Embodiment 1-1. In this embodiment, the object-side surface S1 of the first lens is in partial contact with the first lens barrel P0; the object-side surface and image-side surface of the first spacer element P1 are in partial 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 third spacer element P3 are in partial contact with the image-side surface S7 of the third lens and the object-side surface S8 of the fourth lens, respectively; and the image-side surface S9 of the fourth lens is in partial contact with the second lens barrel P20.

[0114] like Figure 5 and Figure 6 The diagram shown is a partial structural schematic of the optical lens in Embodiments 1-2. The support method of each spacer element is the same as in Embodiment 1-1, and will not be described in detail here.

[0115] It should be noted that in telephoto mode, such as Figure 3 and Figure 5 As shown, the object distance of the optical lenses in Examples 1-1 and 1-2 is infinite. In macro mode, such as Figure 4 and Figure 6 As shown, the object distance of the optical lenses in Examples 1-1 and 1-2 is 200mm. The optical lenses can achieve continuous zoom between the effective focal length in telephoto mode and the effective focal length in macro mode.

[0116] In summary, the structural parameters of the optical lens of Embodiment 1 under Embodiments 1-1 and 1-2 are shown in Table 11.

[0117] In Embodiment 1, the first lens E1 has positive optical power, and both its object-side surface S1 and image-side surface S2 are convex. The second lens E2 has positive optical power, and both its object-side surface S3 and image-side surface S4 are convex. The third lens E3 has negative optical power, and both its object-side surface S6 and image-side surface S7 are concave. The fourth lens E4 has positive optical power, and both its object-side surface S8 and image-side surface S9 are concave.

[0118] In Table 1 below, 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 on the first lens E1.

[0119] Table 1 shows the basic structural parameters of the optical lens in Embodiment 1, where the units for radius of curvature and thickness are millimeters (mm). Positive numbers in the thickness represent the distance from the object side to the image side, and negative numbers represent the distance from the image side to the object side.

[0120]

[0121] Table 1

[0122] It should be noted that the trapezoidal prism and vignetting stop S12 in Table 1 can be replaced with a parallel plate. For the data after replacing the trapezoidal prism and vignetting stop S12 with a parallel plate, please refer to Table 2. The data in Table 1 and Table 2 can be converted between each other. The basic structural parameter tables in Embodiments 2, 3, and 4 below are all based on data from a parallel plate. Specific data regarding the trapezoidal prism are not presented in Embodiments 2 to 4.

[0123] In Table 2 below, OBJ (not shown in the figure) is the object plane of the optical lens, the thickness of the object plane OBJ (not shown in the figure) is the object distance, STO (not shown in the figure) is the aperture stop, and the aperture stop is located on the first lens E1. S5 (not shown in the figure) is the virtual point of the first group D1, ensuring that the distance from the image side of the second lens to the virtual point of the first group D1 remains unchanged. S10 (not shown in the figure) is the virtual point of the second group D2, ensuring that the distance from the image side of the fourth lens to the virtual point of the second group D2 remains unchanged. This design helps to maintain a certain gap behind the first group D1 and the second group D2 to meet the zoom requirements of the second group D2. S11 and S12 (not shown in the figure) are the object side and image side of the parallel plate. S13 and S14 (not shown in the figure) can be the object side and image side of the filter or protective glass. S15 (not shown in the figure) is the imaging plane of the optical lens. That is to say, the light from the object plane passes through S1 to S14 to reach the imaging plane S15 (not shown in the figure).

[0124] 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). Positive numbers in the thickness represent the distance from the object side to the image side, and negative numbers represent the distance from the image side to the object side. The thickness data corresponding to plane numbers S5 and S10 change with the object distance, while the thickness data corresponding to other plane numbers do not change with the object distance.

[0125]

[0126] Table 2

[0127] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the fourth lens E4 are both aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0128]

[0129] 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, A20, A22, A24, A26, A28 and A30 that can be used for the aspherical mirrors S1-S4, S6-S9 in Example 1.

[0130] S1 -4.25E-02 -1.13E-02 -6.73E-03 -2.20E-03 -7.53E-04 -2.31E-04 -2.60E-05 S2 7.75E-02 -9.29E-03 -1.92E-03 -3.83E-03 1.09E-03 -7.16E-04 8.02E-04 S3 5.22E-02 2.00E-02 8.24E-03 -4.10E-03 1.93E-03 -8.07E-04 8.44E-04 S4 1.05E-01 2.96E-02 5.93E-03 7.82E-05 6.51E-04 -8.83E-05 1.08E-04 S6 2.68E-01 -4.50E-02 7.56E-03 -6.51E-05 -7.47E-04 5.07E-04 -1.42E-04 S7 2.25E-01 -3.98E-02 2.07E-03 1.09E-03 -9.50E-04 2.29E-05 5.51E-04 S8 7.62E-02 -3.93E-02 4.83E-03 -1.47E-03 2.45E-04 -4.79E-04 6.80E-04 S9 -5.36E-02 -1.23E-02 1.80E-03 -8.49E-04 3.14E-04 -2.04E-04 1.53E-04 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.42E-05 1.15E-05 2.09E-06 1.69E-06 0.00E+00 0.00E+00 0.00E+00 S2 -1.32E-04 -4.09E-05 3.86E-06 -4.43E-07 0.00E+00 0.00E+00 0.00E+00 S3 -1.32E-04 -6.83E-05 4.80E-05 -2.56E-05 0.00E+00 0.00E+00 0.00E+00 S4 1.42E-05 -4.46E-05 3.04E-05 -1.94E-05 0.00E+00 0.00E+00 0.00E+00 S6 -6.91E-05 1.37E-04 -1.05E-04 5.91E-05 -2.93E-05 6.48E-06 0.00E+00 S7 -7.18E-04 5.50E-04 -2.78E-04 9.76E-05 -2.63E-05 4.01E-06 0.00E+00 S8 -6.74E-04 4.99E-04 -2.30E-04 7.04E-05 -2.49E-05 5.80E-06 0.00E+00 S9 -1.21E-04 8.66E-05 -2.32E-05 -5.56E-06 3.01E-06 -1.59E-07 0.00E+00

[0131] Table 3

[0132] Figure 7 The image shows the on-axis chromatic aberration curve of the optical lens in the telephoto state of Embodiment 1, which represents the deflection of the focal point of light of different wavelengths after passing through the optical lens. Figure 8 The astigmatism curve of the optical lens in the first embodiment is shown in the telephoto state, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 9 The distortion curve of the optical lens of Embodiment 1 in the telephoto state is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 10 The magnification chromatic aberration curve of the optical lens in the first embodiment is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical lens.

[0133] Figure 11 The image shows the on-axis chromatic aberration curve of the optical lens in the first embodiment in a macro state, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical lens. Figure 12The astigmatism curve of the optical lens of Embodiment 1 in macro mode is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 13 The distortion curve of the optical lens of Embodiment 1 in macro mode is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 14 The magnification chromatic aberration curve of the optical lens in Embodiment 1 in macro mode is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical lens.

[0134] according to Figures 7 to 14 As can be seen, the optical lens given in Example 1 can achieve good imaging quality.

[0135] Example 2

[0136] like Figures 15 to 26 As shown, the optical lens of Embodiment 2 is described. Figure 15 and Figure 16 The following are schematic diagrams showing partial structures of the optical lens in telephoto and macro modes according to Embodiment 2-1 of the present invention. Figure 17 and Figure 18 The diagrams show partial structural schematics of the optical lens in telephoto mode and partial structural schematics in macro mode of Embodiment 2-2 of the present invention.

[0137] like Figures 15 to 18 As shown, the optical lens includes a first lens barrel P10, a second lens barrel 20, four lenses and multiple spacers. The first lens barrel P10 includes a first lens E1, a first spacer P1 and a second lens E2 arranged sequentially from the object side to the image side. The second lens barrel P20 includes a third lens E3, a third spacer P3 and a fourth lens E4 arranged sequentially from the object side to the image side.

[0138] like Figure 15 and Figure 16 The diagram shows a partial structural schematic of the optical lens in Embodiment 2-1. In this embodiment, the object-side surface S1 of the first lens is in partial contact with the first lens barrel P0; the object-side surface and image-side surface of the first spacer element P1 are in partial 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 third spacer element P3 are in partial contact with the image-side surface S7 of the third lens and the object-side surface S8 of the fourth lens, respectively; and the image-side surface S9 of the fourth lens is in partial contact with the second lens barrel P20.

[0139] like Figure 17 and Figure 18 The diagram shown is a partial structural schematic of the optical lens in Embodiment 2-2. The support method of each spacer element is the same as that in Embodiment 2-1, and will not be described in detail here.

[0140] It should be noted that in telephoto mode, such as Figure 15 and Figure 17 As shown, the object distance of the optical lenses in Examples 2-1 and 2-2 is infinite. In macro mode, such as Figure 16 and Figure 18 As shown, the object distance of the optical lenses in Examples 2-1 and 2-2 is 200mm. The optical lenses can achieve continuous zoom between the effective focal length in telephoto mode and the effective focal length in macro mode.

[0141] In summary, the structural parameters of the optical lens in Embodiment 2 under Embodiments 2-1 and 2-2 are shown in Table 11.

[0142] In Embodiment 2, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is convex. The second lens E2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S6 is concave, and its image-side surface S7 is concave. The fourth lens E4 has negative optical power, its object-side surface S8 is convex, and its image-side surface S9 is concave. In Table 4, OBJ (not shown in the figure) represents the object surface of the optical lens, the thickness of OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture stop, which is located on the first lens E1. S5 (not shown in the figure) is the virtual point of the first group D1, ensuring that the distance from the image side of the second lens to the virtual point of the first group D1 remains unchanged. S10 (not shown in the figure) is the virtual point of the second group D2, ensuring that the distance from the image side of the fourth lens to the virtual point of the second group D2 remains unchanged. This design helps to maintain a certain gap behind the first group D1 and the second group D2 to meet the zoom requirements of the second group D2. S11 and S12 (not shown in the figure) are the object side and image side of the parallel plate. S13 and S14 (not shown in the figure) can be the object side and image side of the filter or protective glass. S15 (not shown in the figure) is the imaging surface of the optical lens. That is, light from the object surface passes through S1 to S14 to reach the imaging surface S15 (not shown in the figure).

[0143] 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). Positive numbers in the thickness represent the distance from the object side to the image side, and negative numbers represent the distance from the image side to the object side. The thickness data corresponding to plane numbers S5 and S10 change with the object distance, while the thickness data corresponding to other plane numbers do not change with the object distance.

[0144]

[0145] Table 5 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1-S4 and S6-S9 in Example 2. The surface shape of each aspherical mirror can be defined by formula (1) given in Example 1 above.

[0146]

[0147]

[0148] Table 5

[0149] Figure 19 The image shows the on-axis chromatic aberration curve of the optical lens in the telephoto state of Embodiment 2, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical lens. Figure 20 The astigmatism curve of the optical lens in embodiment 2 at telephoto is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 21 The distortion curve of the optical lens in embodiment 2 in telephoto mode is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 22 The magnification chromatic aberration curve of the optical lens in embodiment 2 at telephoto is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical lens.

[0150] Figure 23 The image shows the on-axis chromatic aberration curve of the optical lens in the macro state of Embodiment 2, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical lens. Figure 24 The astigmatism curve of the optical lens in embodiment 2 in macro mode is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 25 The distortion curve of the optical lens of Embodiment 2 in macro mode is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 26 The magnification chromatic aberration curve of the optical lens in embodiment 2 in macro mode is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical lens.

[0151] according to Figures 19 to 26 It can be seen that the optical lens given in Example 2 can achieve good imaging quality.

[0152] Example 3

[0153] like Figures 27 to 38 As shown, the optical lens of Embodiment 3 is described. Figure 27 and Figure 28 The following are partial structural schematic diagrams of the optical lens in embodiment 3-1 of the present invention in telephoto mode and in macro mode, respectively. Figure 29 and Figure 30 The diagrams show partial structural schematics of the optical lens in telephoto mode and macro mode of Embodiments 3-2 of the present invention, respectively.

[0154] like Figures 27 to 30 As shown, the optical lens includes a first lens barrel P10, a second lens barrel 20, four lenses and multiple spacers. The first lens barrel P10 includes a first lens E1, a first spacer P1 and a second lens E2 arranged sequentially from the object side to the image side. The second lens barrel P20 includes a third lens E3, a third spacer P3 and a fourth lens E4 arranged sequentially from the object side to the image side.

[0155] like Figure 27 and Figure 28 The diagram shown is a partial structural schematic of the optical lens of Embodiment 3-1. In this embodiment, the object-side surface S1 of the first lens is in partial contact with the first lens barrel P0; the object-side surface and image-side surface of the first spacer element P1 are in partial 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 third spacer element P3 are in partial contact with the image-side surface S7 of the third lens and the object-side surface S8 of the fourth lens, respectively; and the image-side surface S9 of the fourth lens is in partial contact with the second lens barrel P20.

[0156] like Figure 29 and Figure 30 The diagram shown is a partial structural schematic of the optical lens in Embodiment 3-2. The support method of each spacer element is the same as in Embodiment 3-1, and will not be described in detail here.

[0157] It should be noted that in telephoto mode, such as Figure 27 and Figure 29 As shown, the object distance of the optical lenses in Examples 3-1 and 3-2 is infinite. In macro mode, such as Figure 28 and Figure 30 As shown, the object distance of the optical lenses in Examples 3-1 and 3-2 is 200mm. The optical lenses can achieve continuous zoom between the effective focal length in telephoto mode and the effective focal length in macro mode.

[0158] In summary, the structural parameters of the optical lens in Embodiment 3 under Embodiments 3-1 and 3-2 are shown in Table 11.

[0159] In Embodiment 3, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is convex. The second lens E2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S6 is convex, and its image-side surface S7 is concave. The fourth lens E4 has positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is concave. In Table 6, OBJ (not shown in the figure) represents the object surface of the optical lens, the thickness of OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture stop, which is located on the first lens E1. S5 (not shown in the figure) is the virtual point of the first group D1, ensuring that the distance from the image side of the second lens to the virtual point of the first group D1 remains unchanged. S10 (not shown in the figure) is the virtual point of the second group D2, ensuring that the distance from the image side of the fourth lens to the virtual point of the second group D2 remains unchanged. This design helps to maintain a certain gap behind the first group D1 and the second group D2 to meet the zoom requirements of the second group D2. S11 and S12 (not shown in the figure) are the object side and image side of the parallel plate. S13 and S14 (not shown in the figure) can be the object side and image side of the filter or protective glass. S15 (not shown in the figure) is the imaging surface of the optical lens. That is, light from the object surface passes through S1 to S14 to reach the imaging surface S15 (not shown in the figure).

[0160] 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). Positive numbers in the thickness represent the distance from the object side to the image side, and negative numbers represent the distance from the image side to the object side. The thickness data corresponding to plane numbers S5 and S10 change with the object distance, while the thickness data corresponding to other plane numbers do not change with the object distance.

[0161]

[0162] Table 6

[0163] Table 7 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1-S4 and S6-S9 in Example 3. The surface shape of each aspherical mirror can be defined by formula (1) given in Example 1 above.

[0164] S1 -9.08E-02 -2.52E-02 -7.66E-03 -2.12E-03 -3.94E-04 -9.12E-05 2.02E-06 S2 5.70E-02 -2.51E-02 -4.04E-03 -1.69E-03 1.82E-03 -3.35E-04 -1.25E-04 S3 1.07E-01 2.39E-02 5.94E-05 -7.45E-04 1.24E-03 -2.02E-04 -1.41E-04 S4 1.95E-01 2.83E-02 3.35E-03 9.26E-04 6.12E-05 2.90E-05 -5.88E-05 S6 3.35E-01 -6.38E-02 1.86E-02 -7.09E-03 3.58E-03 -1.53E-03 9.53E-04 S7 1.99E-01 -1.14E-01 9.91E-03 -1.94E-02 3.10E-03 -3.96E-03 1.20E-03 S8 3.02E-02 -8.54E-02 1.50E-02 -1.49E-02 3.12E-03 -2.66E-03 1.10E-03 S9 -1.50E-01 -2.90E-02 5.51E-03 -3.88E-03 1.48E-03 -5.18E-04 3.76E-04 Face number A18 A20 A22 A24 A26 A28 A30 S1 -2.18E-06 1.22E-05 -9.61E-07 -1.26E-10 0.00E+00 0.00E+00 0.00E+00 S2 1.61E-04 -1.22E-04 -3.35E-05 4.98E-05 0.00E+00 0.00E+00 0.00E+00 S3 1.93E-04 -1.66E-04 -9.82E-06 1.61E-05 0.00E+00 0.00E+00 0.00E+00 S4 2.53E-05 -5.55E-05 -2.57E-06 -1.65E-05 0.00E+00 0.00E+00 0.00E+00 S6 -5.19E-04 2.58E-04 -1.45E-04 4.89E-05 -2.67E-05 9.06E-06 0.00E+00 S7 -1.11E-03 3.38E-04 -2.42E-04 7.00E-05 -3.01E-05 -4.05E-06 0.00E+00 S8 -7.08E-04 3.02E-04 -1.39E-04 8.51E-05 -2.26E-06 1.46E-06 0.00E+00 S9 -2.06E-04 1.03E-04 -4.59E-05 3.39E-05 -8.57E-06 -6.13E-07 0.00E+00

[0165] Table 7

[0166] Figure 31The image shows the on-axis chromatic aberration curve of the optical lens in the telephoto state of Embodiment 3, which represents the deflection of the focal point of light of different wavelengths after passing through the optical lens. Figure 32 The astigmatism curve of the optical lens in embodiment three at telephoto is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 33 The distortion curve of the optical lens in the telephoto state of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 34 The magnification chromatic aberration curve of the optical lens in the telephoto state of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical lens.

[0167] Figure 35 The on-axis chromatic aberration curve of the optical lens in embodiment three in macro mode is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical lens. Figure 36 The astigmatism curve of the optical lens of Embodiment 3 in macro mode is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 37 The distortion curve of the optical lens of Embodiment 3 in macro mode is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 38 The magnification chromatic aberration curve of the optical lens in embodiment three in macro mode is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical lens.

[0168] according to Figures 31 to 38 It can be seen that the optical lens given in Example 3 can achieve good imaging quality.

[0169] Example 4

[0170] like Figures 39 to 50 As shown, the optical lens of Embodiment 4 is described. Figure 39 and Figure 40 The following are partial structural schematic diagrams of the optical lens in embodiment 4-1 of the present invention in telephoto mode and in macro mode, respectively. Figure 41 and Figure 42 The diagrams show partial structural schematics of the optical lens in telephoto mode and macro mode of Embodiment 4-2 of the present invention, respectively.

[0171] like Figures 39 to 42 As shown, the optical lens includes a first lens barrel P10, a second lens barrel 20, four lenses and multiple spacers. The first lens barrel P10 includes a first lens E1, a first spacer P1 and a second lens E2 arranged sequentially from the object side to the image side. The second lens barrel P20 includes a third lens E3, a third spacer P3 and a fourth lens E4 arranged sequentially from the object side to the image side.

[0172] like Figure 39 and Figure 40 The diagram shown is a partial structural schematic of the optical lens of Embodiment 4-1. In this embodiment, the object-side surface S1 of the first lens is in partial contact with the first lens barrel P0; the object-side surface and image-side surface of the first spacer element P1 are in partial 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 third spacer element P3 are in partial contact with the image-side surface S7 of the third lens and the object-side surface S8 of the fourth lens, respectively; and the image-side surface S9 of the fourth lens is in partial contact with the second lens barrel P20.

[0173] like Figure 41 and Figure 42 The diagram shown is a partial structural schematic of the optical lens in Embodiment 4-2. The support method of each spacer element is the same as in Embodiment 4-1, and will not be described in detail here.

[0174] It should be noted that in telephoto mode, such as Figure 39 and Figure 41 As shown, the object distance of the optical lenses in Examples 4-1 and 4-2 is infinite. In macro mode, such as Figure 40 and Figure 42 As shown, the object distance of the optical lenses in Examples 4-1 and 4-2 is 200mm. The optical lenses can achieve continuous zoom between the effective focal length in telephoto mode and the effective focal length in macro mode.

[0175] In summary, the structural parameters of the optical lens in Embodiment 4 under Embodiments 4-1 and 4-2 are shown in Table 11.

[0176] In Embodiment 4, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is convex. The second lens E2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S6 is concave, and its image-side surface S7 is concave. The fourth lens E4 has positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. In Table 8, OBJ (not shown in the figure) represents the object surface of the optical lens, the thickness of OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture stop, which is located on the first lens E1. S5 (not shown in the figure) is the virtual point of the first group D1, ensuring that the distance from the image side of the second lens to the virtual point of the first group D1 remains unchanged. S10 (not shown in the figure) is the virtual point of the second group D2, ensuring that the distance from the image side of the fourth lens to the virtual point of the second group D2 remains unchanged. This design helps to maintain a certain gap behind the first group D1 and the second group D2 to meet the zoom requirements of the second group D2. S11 and S12 (not shown in the figure) are the object side and image side of the parallel plate. S13 and S14 (not shown in the figure) can be the object side and image side of the filter or protective glass. S15 (not shown in the figure) is the imaging surface of the optical lens. That is, light from the object surface passes through S1 to S14 to reach the imaging surface S15 (not shown in the figure).

[0177] Table 8 shows the basic structural parameters of the optical lens in Embodiment 4, where the units for radius of curvature and thickness are millimeters (mm). Positive numbers in the thickness represent the distance from the object side to the image side, and negative numbers represent the distance from the image side to the object side. The thickness data corresponding to plane numbers S5 and S10 change with the object distance, while the thickness data corresponding to other plane numbers do not change with the object distance.

[0178]

[0179]

[0180] Table 8

[0181] Table 9 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1-S4 and S6-S9 in Example 4. The aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0182] S1 -7.26E-02 -2.73E-02 -9.51E-03 -3.80E-03 -1.01E-03 -2.66E-04 -2.90E-05 S2 9.99E-02 -1.65E-02 -6.62E-03 -2.81E-04 4.88E-04 4.55E-04 -3.41E-04 S3 1.03E-01 3.67E-02 -1.62E-03 2.84E-03 -2.28E-04 7.46E-04 -4.16E-04 S4 1.14E-01 4.19E-02 4.26E-04 3.86E-03 -7.44E-04 6.71E-04 -3.12E-04 S6 2.41E-01 -4.75E-02 1.17E-02 -2.90E-03 8.88E-04 2.17E-04 -2.84E-04 S7 3.34E-01 -7.07E-02 7.19E-03 -6.21E-03 5.44E-04 -7.23E-05 -2.17E-04 S8 4.29E-02 -4.13E-02 -7.83E-04 -5.11E-03 1.32E-04 -2.91E-04 -1.66E-06 S9 -6.43E-02 -3.22E-02 -4.81E-04 -2.42E-03 5.94E-04 -1.65E-04 7.67E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.36E-05 2.36E-05 3.20E-06 -1.65E-06 0.00E+00 0.00E+00 0.00E+00 S2 4.76E-04 -4.52E-04 1.80E-04 -1.97E-05 0.00E+00 0.00E+00 0.00E+00 S3 5.26E-04 -4.55E-04 1.73E-04 -4.86E-05 0.00E+00 0.00E+00 0.00E+00 S4 2.02E-04 -1.64E-04 6.23E-05 -3.80E-05 0.00E+00 0.00E+00 0.00E+00 S6 2.26E-04 -1.80E-04 1.11E-04 -6.86E-05 2.05E-05 -1.31E-06 0.00E+00 S7 6.55E-05 -9.14E-05 6.09E-05 -1.47E-05 -6.02E-07 -4.33E-06 0.00E+00 S8 -5.09E-05 -1.69E-05 2.18E-05 1.80E-05 9.15E-06 -4.86E-06 0.00E+00 S9 -6.01E-05 1.43E-05 1.27E-06 1.25E-05 -4.84E-06 3.14E-07 0.00E+00

[0183] Figure 43The image shows the on-axis chromatic aberration curve of the optical lens in the telephoto state of Embodiment 4, which represents the deflection of the focal point of light of different wavelengths after passing through the optical lens. Figure 44 The astigmatism curve of the optical lens in embodiment four at telephoto is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 45 The distortion curve of the optical lens in embodiment four in the telephoto state is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 46 The magnification chromatic aberration curve of the optical lens in embodiment four at telephoto is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical lens.

[0184] Figure 47 The image shows the on-axis chromatic aberration curve of the optical lens in the macro state of Embodiment 4, which represents the deflection of the focal point of light of different wavelengths after passing through the optical lens. Figure 48 The astigmatism curve of the optical lens of Embodiment 4 in macro mode is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 49 The distortion curve of the optical lens of Embodiment 4 in macro mode is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 50 The magnification chromatic aberration curve of the optical lens in embodiment four in macro mode is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical lens.

[0185] according to Figures 43 to 50 It can be seen that the optical lens given in Example 4 can achieve good imaging quality.

[0186] In summary, the optical lenses of Examples 1 to 4 respectively satisfy the relationships shown in Table 10.

[0187] R3 / d1m -10.24 -10.32 -4.11 -4.08 -2.93 -2.88 -15.60 -15.86 EP101 / SAG11 1.67 1.72 1.79 1.70 2.11 2.03 1.66 1.77 T12 / CP1 6.12 4.08 6.05 4.84 5.94 4.75 3.33 2.42 f12 / L10 1.99 1.97 2.45 2.31 2.01 2.15 1.80 1.90 f34 / L20 -3.64 -3.44 -4.34 -5.36 -5.04 -5.01 -3.55 -3.12 f1 / (CT1+EP101) 2.01 1.97 2.07 2.13 1.76 1.80 1.79 1.74 R2 / R1 -14.98 -14.98 -10.22 -10.22 -17.17 -17.17 -13.84 -13.84 R1 / (D10s-d10s) 6.15 6.47 8.75 14.52 4.14 4.14 7.27 7.18 R2 / (D1s-d1s) -30.08 -36.67 -22.89 -25.00 -27.23 -25.00 -27.73 -21.09 R4×N2 / d20s -4.65 -4.75 -5.82 -5.15 -4.05 -5.36 -7.42 -10.41 CT3×N3 / EP203 0.60 0.63 0.75 1.00 0.82 0.72 0.65 0.60 R6 / f3 -1.24 -1.24 -2.66 -2.66 -0.59 -0.59 -1.40 -1.40 (D20m-d20m) / (D3s-d3s) 1.28 1.47 1.50 1.16 1.28 0.14 1.25 0.18 L20 / (SAG32+SAG41) 1.71 1.81 2.57 2.08 1.61 1.62 3.73 4.24 |R8 / R7| 1.18 1.18 0.86 0.86 0.93 0.93 1.67 1.67 <![CDATA[R2 / d1s / d10s(mm -1 )]]> -1.45 -1.50 -1.06 -1.06 -1.65 -1.55 -1.25 -1.18

[0188] Table 10

[0189] Table 11 shows some parameters of the optical lenses in Examples 1 to 4 (HFOV is in °, Fno is dimensionless, and other parameters are in mm). Here, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f12 is the combined focal length of the first and second lenses, and f34 is the combined focal length of the third and fourth lenses. In Table 11, the parameters with (inf) and (200) change with the object distance, while the other parameters without (inf) and (200) do not change with the object distance. That is, in Table 11, ImgH, FOV, Fno, and f change with the object distance, while the data for other parameters remain unchanged.

[0190]

[0191]

[0192] Table 11

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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, The optical lens is composed of four lenses. The optical lens includes a first group, a second group, and subsequent elements arranged sequentially from the object side to the image side along the optical axis of the optical lens. The first group includes only two lenses, the second group includes only two lenses, and the subsequent elements are reflective or transmissive elements. The first group includes a first lens barrel and a first lens, a first spacer element, and a second lens disposed within the first lens barrel. The first spacer element is located between the first lens and the second lens and is in contact with the image-side surface of the first lens. The first lens has positive optical power, the object-side surface of the first lens is convex, and the image-side surface of the first lens is convex. The second lens has positive optical power, the object-side surface of the second lens is concave, and the image-side surface of the second lens is convex. The second group includes a second lens barrel and a third lens, a third spacer element, and a fourth lens housed within the second lens barrel. The third spacer element is located between the third lens and the fourth lens and is in contact with the image-side surface of the third lens. The third lens has negative optical power, the image-side surface of the third lens is concave, and the object-side surface of the fourth lens is convex. The radius of curvature R2 of the image side of the first lens and the radius of curvature R1 of the object side of the first lens satisfy the following condition: -17.17≤R2 / R1≤-10.22; The radius of curvature R3 of the object side of the second lens and the inner diameter d1m of the image side of the first spacer element satisfy the following condition: -15.86≤R3 / d1m≤-2.88; The combined focal length f34 of the third lens and the fourth lens and the maximum height L20 of the second lens barrel satisfy the following condition: -5.36≤f34 / L20≤-3.

12.

2. The optical lens according to claim 1, characterized in that, The distance EP101 between the object-side end face of the first lens barrel and the object-side surface of the first spacer element along the optical axis, and the axial distance SAG11 between the intersection of the object-side surface of the first lens and the optical axis of the optical lens and the vertex of the effective radius of the object-side surface of the first lens, satisfy the following: 1.66≤EP101 / SAG11≤2.

11.

3. The optical lens according to claim 1, characterized in that, The air gap T12 between the image side of the first lens and the object side of the second lens on the optical axis of the optical lens, and the maximum thickness CP1 of the first spacer element in the optical axis direction, satisfy the following: 2.42≤T12 / CP1≤6.

12.

4. The optical lens according to claim 1, characterized in that, The maximum height L10 of the first lens barrel and the combined focal length f12 of the first lens and the second lens satisfy the following condition: 1.80≤f12 / L10≤2.

45.

5. The optical lens according to claim 1, characterized in that, The effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis of the optical lens, and the distance EP101 between the object-side end face of the first lens barrel and the object-side surface of the first spacer element along the optical axis direction satisfy the following: 1.74≤f1 / (CT1+EP101)≤2.

13.

6. The optical lens according to claim 1, characterized in that, The radius of curvature R1 of the object side surface of the first lens, the outer diameter D10s of the object side end face of the first lens barrel, and the inner diameter d10s of the object side end face of the first lens barrel satisfy the following condition: 4.14≤R1 / (D10s-d10s)≤14.

52.

7. The optical lens according to claim 1, characterized in that, The radius of curvature R2 of the image side of the first lens, the outer diameter D1s of the object side of the first spacer element, and the inner diameter d1s of the object side of the first spacer element satisfy the following: -36.67≤R2 / (D1s-d1s)≤-21.

09.

8. The optical lens according to claim 1, characterized in that, The second group is capable of moving along the optical axis.

9. The optical lens according to claim 8, characterized in that, The radius of curvature R4 of the image side of the second lens, the inner diameter d20s of the object side end face of the second lens barrel, and the refractive index N2 of the second lens satisfy the following condition: -10.41≤R4×N2 / d20s≤-4.

05.

10. The optical lens according to claim 8, characterized in that, The central thickness CT3 of the third lens on the optical axis of the optical lens, the refractive index N3 of the third lens, and the spacing distance EP203 between the object-side end face of the second lens barrel and the object-side surface of the third spacer element along the optical axis direction satisfy the following: 0.60≤CT3×N3 / EP203≤1.

00.

11. The optical lens according to claim 8, characterized in that, The image-side surface of the third lens is concave, and the radius of curvature R6 of the image-side surface of the third lens and the effective focal length f3 of the third lens satisfy the following condition: -2.66≤R6 / f3≤-0.

59.

12. The optical lens according to claim 8, characterized in that, The outer diameter D20m of the image-side end face of the second lens tube, the inner diameter d20m of the image-side end face of the second lens tube, the outer diameter D3s of the object-side side face of the third spacer element, and the inner diameter d3s of the object-side side face of the third spacer element satisfy the following condition: 0.14≤(D20m-d20m) / (D3s-d3s)≤1.

50.

13. The optical lens according to claim 8, characterized in that, The maximum height L20 of the second lens barrel, the axial distance SAG32 between the intersection of the image-side surface of the third lens and the optical axis of the optical lens and the vertex of the effective radius of the image-side surface of the third lens, and the axial distance SAG41 between the intersection of the object-side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fourth lens satisfy the following condition: 1.61≤L20 / (SAG32+SAG41)≤4.

24.

14. The optical lens according to claim 8, characterized in that, The radius of curvature R8 of the image side of the fourth lens and the radius of curvature R7 of the object side of the fourth lens satisfy the following condition: 0.86≤|R8 / R7|≤1.

67.

15. The optical lens according to any one of claims 1 to 14, characterized in that, The reflective element is a trapezoidal prism.

16. The optical lens according to any one of claims 1 to 14, characterized in that, The optical lens satisfies at least one of the following: The reflective element is an isosceles trapezoidal prism; The reflective element has a microstructure.

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