Optical lens

Abstract

The application provides an optical lens. The optical lens comprises a lens barrel, a lens group arranged in the lens barrel and a plurality of spacing elements, the lens group is composed of five lenses with optical power and a prism, the five lenses with optical power comprise a first lens with positive optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with negative optical power and a fifth lens with positive optical power; the following conditions are met: -1.75 < f45 / f < -0.90; the following condition is met: -6.15 mm <= V4 / V5 x R8 < 8.85 mm and V4 / V5 x R8 is not equal to 0; the following condition is met: 1.30 < D4s / d4s < 2.15. The application solves the problem that the optical parameters of the rear-end lens are constrained in the prior art five-piece optical lens, the light collecting capacity of the optical lens is poor, the rear-end lens generates invalid light paths, and the MTF defocus curve performance is affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging devices, in particular to an optical lens. BACKGROUND

[0002] With the continuous development of modern optical system design, the use of long-focus lenses in mobile phone cameras is also increasing, and the performance and small size requirements of long-focus lenses by major manufacturers are also increasing. Five-piece long-focus optical lenses are widely used in various electronic devices because they can meet the demand for small size, such as in the camera systems of mobile devices such as mobile phones. At the same time, in order to improve the performance of the optical lens, the design of the five-piece optical lens faces many challenges.

[0003] At present, the five-piece optical lens introduces a prism to constrain the light transmission path, reducing the volume ratio of the optical lens and the camera module it applies to, meeting the market demand for small size, and by constraining the optical parameters of the rear lens, such as effective focal length, Abbe number and curvature radius, the rear lens has the characteristics of long focal length and low dispersion, but the above characteristics reduce the light collection ability of the rear lens, increase the light rays of the edge part of the rear lens, and cause the generation of invalid light path, affecting the final imaging quality of the optical lens, especially the MTF defocus curve.

[0004] That is, the five-piece optical lens in the prior art has the problem that constraining the optical parameters of the rear lens leads to poor light collection ability, which in turn leads to the generation of invalid light path in the rear lens, thereby affecting the MTF defocus curve performance. SUMMARY

[0005] The main purpose of the present application is to provide an optical lens to solve the problem that the five-piece optical lens in the prior art has the problem that constraining the optical parameters of the rear lens leads to poor light collection ability, which in turn leads to the generation of invalid light path in the rear lens, thereby affecting the MTF defocus curve performance.

[0006] In order to achieve the above object, according to one aspect of the present application, an optical lens is provided, comprising a lens barrel, a lens group arranged in the lens barrel, and a plurality of spacer elements, the lens group is composed of a prism and five lenses with optical power, the five lenses with optical power comprise a first lens with positive optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power; the object side surface of the first lens is convex, the image side surface of the first lens is concave; the object side surface of the second lens is convex, the image side surface of the second lens is convex; the object side surface of the third lens is convex, the image side surface of the third lens is concave; the image side surface of the fifth lens is convex; the optical axis of the optical lens comprises an X optical axis and a Y optical axis, the first lens is arranged along the Y optical axis from the object side to the prism, the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged along the X optical axis from the prism to the image side, and the X optical axis is perpendicular to the Y optical axis; the prism has an incident surface, a reflection surface and an exit surface, the incident surface is arranged close to the image side surface of the first lens, the exit surface is arranged close to the object side surface of the second lens, the reflection surface is located between the incident surface and the exit surface, light is incident on the prism along the Y optical axis, and is emitted from the prism along the X optical axis after being reflected by the reflection surface; the plurality of spacer elements comprise a fourth spacer element arranged between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; wherein the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: -1.75 < f45 / f < -0.90; the dispersion coefficient V4 of the fourth lens, the dispersion coefficient V5 of the fifth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -6.15 mm ≤ V4 / V5×R8 < 8.85 mm and V4 / V5×R8 is not equal to 0; the outer diameter D4s of the object side surface of the fourth spacer element and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: 1.30 < D4s / d4s < 2.15.

[0007] According to another aspect of the present application, an optical lens is provided, comprising a lens barrel, and a lens group and a plurality of spacer elements arranged in the lens barrel, the lens group consisting of five lenses with optical power and a prism, the five lenses with optical power comprising a first lens with positive optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power; the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the object side surface of the second lens is convex, and the image side surface of the second lens is convex; the object side surface of the third lens is convex, and the image side surface of the third lens is concave; the image side surface of the fifth lens is convex; the optical axis of the optical lens comprises an X optical axis and a Y optical axis, the first lens is arranged along the Y optical axis from the object side to the prism, the second lens, the third lens, the fourth lens, and the fifth lens are sequentially arranged along the X optical axis from the prism to the image side, and the X optical axis is perpendicular to the Y optical axis; the prism has an entrance surface, a reflection surface, and an exit surface, the entrance surface is arranged close to the image side surface of the first lens, the exit surface is arranged close to the object side surface of the second lens, the reflection surface is located between the entrance surface and the exit surface, light is incident on the prism along the Y optical axis, and is emitted from the prism along the X optical axis after being reflected by the reflection surface; the plurality of spacer elements comprises a fourth spacer element arranged between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; wherein the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: -1.75 < f45 / f < -0.90; the dispersion coefficient V4 of the fourth lens, the dispersion coefficient V5 of the fifth lens, and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -6.15 mm ≤ V4 / V5×R8 < 8.85 mm and V4 / V5×R8 is not equal to 0; the outer diameter D4s of the object side surface of the fourth spacer element, the inner diameter d4s of the object side surface of the fourth spacer element, and the central thickness CT4 of the fourth lens on the X optical axis satisfy: 3.00 < (D4s-d4s) / CT4 < 8.05.

[0008] Further, the plurality of spacer elements further comprises a second spacer element arranged between the second lens and the third lens and in contact with the image side surface of the second lens, and a third spacer element arranged between the third lens and the fourth lens and in contact with the image side surface of the third lens, the interval distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element on the X optical axis, the maximum axial thickness CP3 of the third spacer element, and the refractive index N3 of the third lens satisfy: 1.60 < EP23 / CP3×N3 < 44.90.

[0009] Further, the plurality of spacer elements further comprises a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, wherein a central thickness CT2 of the second lens in the X optical axis direction and a radius of curvature R3 of the object side surface of the second lens satisfy 0.05 < CT2 / R3 < 0.40, and wherein an outer diameter D2m of the image side surface of the second spacer element and an inner diameter d2m of the image side surface of the second spacer element satisfy 1.20 < D2m / d2m < 1.70.

[0010] Further, a sum CTx of the central thicknesses of all the lenses arranged in the X optical axis direction and a sum CTy of the central thicknesses of all the lenses arranged in the Y optical axis direction satisfy 1.20 < CTx / CTy < 2.05.

[0011] Further, the lens having the smallest central thickness among the first lens to the fifth lens is the thinnest lens, and a central thickness CTa of the thinnest lens in the optical axis direction thereof and an outer diameter Das of the object side surface of the spacer element disposed on the image side of the thinnest lens and in contact with the image side surface of the thinnest lens satisfy 0.05 ≤ CTa / Das < 0.15.

[0012] Further, the plurality of spacer elements further comprises a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, wherein an outer diameter D3s of the object side surface of the third spacer element, an inner diameter d3s of the object side surface of the third spacer element, and an effective focal length f3 of the third lens satisfy 0.05 ≤ π × (D3s 2 -d3s 2 ) / f3 2 < 2.35.

[0013] Further, the plurality of spacer elements further comprises a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, wherein a radius of curvature R3 of the object side surface of the second lens and a radius of curvature R4 of the image side surface of the second lens satisfy -0.95 < R3 / R4 ≤ -0.15, and wherein an inner diameter d2m of the image side surface of the second spacer element and an outer diameter D2m of the image side surface of the second spacer element satisfy 0.60 ≤ d2m / D2m < 0.85.

[0014] Further, the lens barrel is composed of a first lens barrel and a second lens barrel, wherein a central axis of the first lens barrel coincides with the Y optical axis, and a central axis of the second lens barrel coincides with the X optical axis, and wherein the second lens barrel is movably disposed with respect to the prism.

[0015] Further, an outer diameter D0m of the image-side end surface of the first lens barrel satisfies 4.65 < D0m / L < 5.35 with respect to a maximum axial height L of the first lens barrel; and an effective focal length f1 of the first lens satisfies 4.70 < f1 / DT11 < 7.00 with respect to an effective radius DT11 of the object-side surface of the first lens.

[0016] Further, an outer diameter D0bs of the object-side end surface of the second lens barrel satisfies 1.10 < D0bs / d0bs < 1.55 with respect to an inner diameter d0bs of the object-side end surface of the second lens barrel; and an effective focal length f of the optical lens satisfies 2.45 < f / EPD < 2.95 with respect to an entrance pupil diameter EPD of the optical lens.

[0017] With the technical scheme of the present application, the optical lens of the present application has a long focal length and low dispersion characteristics by reasonably arranging the positions of the prism and the fourth spacer element and the refractive powers and surface shapes of the five lenses, and setting -1.75 < f45 / f < -0.90 and -6.15 mm ≤ V4 / V5 x R8 < 8.85 mm and V4 / V5 x R8 ≠ 0, but the fourth lens and the fifth lens have poor light condensing ability, which leads to poor consistency of light rays of different wavelengths, and thus easily increases the light rays at the edge of the fourth lens at the rear end, and thus causes the generation of invalid light paths, affecting the final imaging quality of the optical lens, especially having a large impact on the MTF defocus curve. Therefore, by limiting 1.30 < D4s / d4s < 2.15, the ratio of the outer diameter of the object-side surface of the fourth spacer element to the inner diameter of the object-side surface of the fourth spacer element can be controlled, so that the invalid light paths reflected by the fourth lens and the object-side structure thereof can be effectively intercepted by the fourth spacer element, which is conducive to improving the optical performance of the optical lens, effectively improving the peak concentration of the MTF defocus curve, and thus improving the imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the application, and together with the description of the application, serve to explain the application. In the drawings:

[0019] Figure 1 A size labeling diagram of the optical lens of one optional embodiment of the present application is shown;

[0020] Figure 2 A structure schematic diagram of the optical lens of embodiment 1-1 of the present application is shown;

[0021] Figure 3 A structure schematic diagram of the optical lens of embodiment 1-2 of the present application is shown;

[0022] Figure 4A structural diagram of an optical lens of the embodiment 1 of the present application is shown;

[0023] Figure 5 An on-axis chromatic aberration curve of the optical lens of the embodiment one of the present application is shown;

[0024] Figure 6 A distortion curve of the optical lens of the embodiment one of the present application is shown;

[0025] Figure 7 A distortion curve of the optical lens of the embodiment one of the present application is shown;

[0026] Figure 8 A structural diagram of an optical lens of the embodiment 2-1 of the present application is shown;

[0027] Figure 9 A structural diagram of an optical lens of the embodiment 2-2 of the present application is shown;

[0028] Figure 10 A structural diagram of an optical lens of the embodiment 2-3 of the present application is shown;

[0029] Figure 11 An on-axis chromatic aberration curve of the optical lens of the embodiment two of the present application is shown;

[0030] Figure 12 An on-axis chromatic aberration curve of the optical lens of the embodiment two of the present application is shown;

[0031] Figure 13 A distortion curve of the optical lens of the embodiment two of the present application is shown;

[0032] Figure 14 A structural diagram of an optical lens of the embodiment 3-1 of the present application is shown;

[0033] Figure 15 A structural diagram of an optical lens of the embodiment 3-2 of the present application is shown;

[0034] Figure 16 A structural diagram of an optical lens of the embodiment 3-3 of the present application is shown;

[0035] Figure 17 An on-axis chromatic aberration curve of the optical lens of the embodiment three of the present application is shown;

[0036] Figure 18 An on-axis chromatic aberration curve of the optical lens of the embodiment three of the present application is shown;

[0037] Figure 19 A distortion curve of the optical lens of the embodiment three of the present application is shown;

[0038] Figure 20The MTF defocus curve diagram of the optical lens of the scheme 1 of the present application is shown when f45 / f=-1.43, V4 / V5xR8=8.81 and D4s / d4s=1.81 are satisfied;

[0039] Figure 21 The MTF defocus curve diagram of the optical lens of the comparative example 1 is shown when f45 / f=-1.43, V4 / V5xR8=8.81 and D4s / d4s=1.10 are satisfied;

[0040] Figure 22 The MTF defocus curve diagram of the optical lens of the comparative example 2 is shown when f45 / f=-1.43, V4 / V5xR8=8.81 and D4s / d4s=2.30 are satisfied.

[0041] Wherein, the above figures include the following reference signs:

[0042] P0, first lens barrel; P0b, second lens barrel; E1, first lens; S1, object side surface of the first lens; S2, image side surface of the first lens; E2, second lens; S5, object side surface of the second lens; S6, image side surface of the second lens; E3, third lens; S7, object side surface of the third lens; S8, image side surface of the third lens; E4, fourth lens; S9, object side surface of the fourth lens; S10, image side surface of the fourth lens; E5, fifth lens; S11, object side surface of the fifth lens; S12, image side surface of the fifth lens; P2, second spacer element; P3, third spacer element; P3b, third auxiliary spacer element; P4, fourth spacer element; P4b, fourth auxiliary spacer element; P4c, fourth auxiliary spacer element; S3, entrance surface; S4, exit surface. DETAILED DESCRIPTION

[0043] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0044] It should be noted that, unless otherwise specified, all the technical and scientific terms used in the present application have the same meaning as that generally understood by the ordinary skilled in the art to which the present application belongs.

[0045] In the present application, unless otherwise specified, the orientation words such as "upper", "lower", "top", "bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0046] It should be noted that in the present specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0047] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn strictly to scale.

[0048] In the present specification, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be made in accordance with the judgment method of those skilled in the art, with the R value (R refers to the radius of curvature in the paraxial region, usually refers to the R value on the lens data in the optical software) being positive or negative to judge the convexity or concavity. In terms of the object side surface, 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. In terms of the image side surface, 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. When the R value is infinite, it is determined to be a plane.

[0049] In the present application, the object side refers to the side of the optical lens facing the photographed object (not shown in the figure), and the image side refers to the side of the optical lens facing the imaging surface. Hereinafter, the object side surface of the lens refers to the surface on the side of the lens facing the photographed object (not shown in the figure), and the image side surface of the lens refers to the surface on the side of the lens facing the imaging surface.

[0050] In order to solve the problem that the optical parameter of the rear lens is constrained in the prior art five-piece optical lens, the light collecting ability is poor, and the rear lens generates invalid light path, thereby affecting the MTF defocus curve performance, the present application provides an optical lens.

[0051] As Figures 1 to 20In an optional embodiment of the present application, an optical lens is provided, which includes a lens barrel, a lens set arranged in the lens barrel, and a plurality of spacer elements. The lens set is composed of five lenses with optical power and a prism. The five lenses with optical power include a first lens with positive optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power. The object side surface of the first lens is convex, and the image side surface of the first lens is concave. The object side surface of the second lens is convex, and the image side surface of the second lens is convex. The object side surface of the third lens is convex, and the image side surface of the third lens is concave. The image side surface of the fifth lens is convex. The optical axis of the optical lens includes an X optical axis and a Y optical axis. The first lens is arranged on the object side of the prism along the Y optical axis. The second lens, the third lens, the fourth lens, and the fifth lens are sequentially arranged on the image side of the prism along the X optical axis. The X optical axis is perpendicular to the Y optical axis. The prism has an incident surface, a reflection surface, and an exit surface. The incident surface is arranged close to the image side surface of the first lens. The exit surface is arranged close to the object side surface of the second lens. The reflection surface is located between the incident surface and the exit surface. Light is incident on the prism along the Y optical axis, and is emitted from the prism along the X optical axis after being reflected by the reflection surface. The plurality of spacer elements includes a fourth spacer element arranged between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. The combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy -1.75 < f45 / f < -0.90. The dispersion coefficient V4 of the fourth lens, the dispersion coefficient V5 of the fifth lens, and the radius of curvature R8 of the image side surface of the fourth lens satisfy -6.15 mm ≤ V4 / V5×R8 < 8.85 mm and V4 / V5×R8 is not equal to 0. The outer diameter D4s of the object side surface of the fourth spacer element and the inner diameter d4s of the object side surface of the fourth spacer element satisfy 1.30 < D4s / d4s < 2.15.

[0052] The optical lens of the present application has the characteristics of long focal length and low dispersion by reasonably arranging the positions of the prism and the fourth spacer element and the refractive power and surface shape of the five lenses, and setting -1.75 < f45 / f < -0.90 and -6.15 mm ≤ V4 / V5 x R8 < 8.85 mm and V4 / V5 x R8 not equal to 0, but the condensing ability of the fourth lens and the fifth lens is poor, which leads to the inconsistency of the light rays of different wavelengths, and then easily increases the light rays of the edge part of the rear fourth lens, and then leads to the generation of invalid light path, which affects the final imaging quality of the optical lens, especially the MTF defocus curve. Therefore, by constraining 1.30 < D4s / d4s < 2.15, the ratio of the outer diameter of the object side of the fourth spacer element to the inner diameter of the object side of the fourth spacer element can be controlled, so that the invalid light path reflected by the fourth lens and its object side structure can be effectively intercepted by the fourth spacer element, which is beneficial to improve the optical performance of the optical lens, effectively improve the peak concentration of the MTF defocus curve, and then improve the imaging quality.

[0053] It should be noted that the invalid light path refers to the light rays that do not participate in the imaging process. This includes light rays that enter the optical lens but will not be focused on the imaging surface, or light rays that are scattered, reflected, absorbed inside the optical lens. The invalid light path can be caused by physical limitations of the design, or by factors such as unevenness of the lens surface, dust, scratches or uneven coating.

[0054] In addition, as shown in Table 1 below, Figures 20 to 22 Under the premise that the optical lens satisfies -1.75 < f45 / f < -0.90 and -6.15 mm ≤ V4 / V5 x R8 < 8.85 mm and V4 / V5 x R8 not equal to 0, for example f45 / f = -1.43, V4 / V5 x R8 = 8.81, Figure 20 Fig. 6 shows the MTF defocus curve diagram of the optical lens of the scheme 1 of the present application when D4s / d4s = 1.81; Figure 21 Fig. 7 shows the MTF defocus curve diagram of the optical lens of the comparative example 1 when D4s / d4s = 1.10; Figure 22 Fig. 8 shows the MTF defocus curve diagram of the optical lens of the comparative example 2 when D4s / d4s = 2.30. In Figures 20 to 22 In the figures, the first field of view is 0F, the second field of view is 0.6F, the third field of view is 0.8F, and the fourth field of view is 1F.

[0055] From Figures 20 to 22As shown, when the optical lens satisfies D4s / d4s=1.81, the parameter design of the object side surface of the fourth spacer element of the optical lens is reasonable, the peak values of the MTF defocus curves are relatively concentrated, and the overall performance is better. When the optical lens satisfies D4s / d4s=1.10, the excessive invalid light cannot be effectively intercepted by the fourth spacer element, the peak values of the central field of view and the edge field of view of the optical lens obviously drop, the final imaging performance of the optical lens is poor, and the overall performance is poor. When the optical lens satisfies D4s / d4s=2.30, the inner diameter of the object side surface of the fourth spacer element is too small, at this time, the fourth spacer element excessively intercepts the light of the edge field of view, according to the principle of the conservation of energy, the light of the central field of view is insufficient, and the peak values of the central field of view and the edge field of view of the optical lens obviously drop. As shown, the field curvature is obviously offset to the left and right, and the performance is poor. It can be seen that when-1.75 Figure 22 As shown, the field curvature is obviously offset to the left and right, and the performance is poor. It can be seen that when-1.75

[0056] Table 1

[0057]

[0058] In the embodiment, the plurality of spacer elements further include a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, and a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens.

[0059] In the embodiment, a distance EP23 between an image-side surface of the second spacer element to an object-side surface of the third spacer element on the X optical axis, a maximum axial thickness CP3 of the third spacer element, and a refractive index N3 of the third lens satisfy: 1.60 < EP23 / CP3 x N3 < 44.90. By controlling the conditional expression, the edge thickness and the center thickness of the third lens can be controlled within a reasonable range, the stability of the third lens forming is ensured, and the light rays can be indirectly controlled to enter the fourth lens smoothly after passing through the third lens, the thickness-to-thickness ratio of the third lens and the machining feasibility of the mold are ensured, thereby being beneficial to the surface stability of the third lens after forming, and finally being helpful to improve the imaging quality of the optical lens.

[0060] In the embodiment, a center thickness CT2 of the second lens on the X optical axis and a curvature radius R3 of the object-side surface of the second lens satisfy: 0.05 < CT2 / R3 < 0.40; an outer diameter D2m of the image-side surface of the second spacer element and an inner diameter d2m of the image-side surface of the second spacer element satisfy: 1.20 < D2m / d2m < 1.70. By controlling the conditional expressions, the ratio of the center thickness of the second lens on the X optical axis and the curvature radius of the object-side surface of the second lens, and the ratio of the inner diameter and the outer diameter of the image-side surface of the second spacer element can be controlled, so as to control the bending degree of the object-side surface of the second lens and the length of the edge structure part, and ensure the stability of the second lens forming.

[0061] In the embodiment, a sum CTx of the center thicknesses of all the lenses arranged in the direction of the X optical axis and a sum CTy of the center thicknesses of all the lenses arranged in the direction of the Y optical axis satisfy: 1.20 < CTx / CTy < 2.05. By controlling the conditional expression, the center thickness of the first lens in the direction of the Y optical axis can be controlled to be moderate, it is ensured that the outgoing light rays in the direction of the Y optical axis can be sufficiently converged, and the machining feasibility and the forming stability of the first lens can be avoided to be affected, and at the same time, the second lens, the third lens, the fourth lens and the fifth lens in the direction of the X optical axis can be constrained to be small in size, and the optical performance and the process requirement of the optical lens on the second lens to the fifth lens are met.

[0062] It should be noted that CTx is specifically the sum of the center thicknesses of the second lens, the third lens, the fourth lens and the fifth lens arranged in the direction of the X optical axis, and Cty is the center thickness of the first lens arranged in the direction of the Y optical axis.

[0063] In the embodiment, the lens with the minimum center thickness among the first lens to the fifth lens is the thinnest lens, and a center thickness CTa of the thinnest lens on an optical axis where the thinnest lens is located and an outer diameter Das of an object side surface of a spacer element located on an image side of the thinnest lens and in contact with the image side surface of the thinnest lens satisfy: 0.05≤CTa / Das<0.15. By controlling the conditional expression, the ratio of the center thickness of the thinnest lens in the optical lens and the outer diameter of the object side surface of the spacer element located on the image side of the thinnest lens and in contact with the image side surface of the thinnest lens can be controlled within a reasonable range, thereby ensuring the forming stability of the thinnest lens and ultimately helping to improve the imaging quality of the optical lens.

[0064] It should be noted that, in some optional embodiments, the thinnest lens is the third lens, and the spacer element located on the image side of the third lens and in contact with the image side surface of the third lens is the third spacer element; in other optional embodiments, the thinnest lens is the fourth lens, and the spacer element located on the image side of the fourth lens and in contact with the image side surface of the fourth lens is the fourth spacer element.

[0065] In the embodiment, an outer diameter D3s of the object side surface of the third spacer element, an inner diameter d3s of the object side surface of the third spacer element, and an effective focal length f3 of the third lens satisfy: 0.05≤π×(D3s 2 -d3s 2 ) / f3 2 <2.35. By controlling the conditional expression, the radial length of the edge structure part of the third lens can be constrained, the structural rationality of the third lens is ensured, thereby ensuring the forming stability of the third lens, which is beneficial to keeping the surface shape of the third lens stable after forming, and the effective focal length of the third lens can also be controlled, so that the light is refracted and transmitted along the required path, which helps to improve the imaging quality of the optical lens.

[0066] In the embodiment, a curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: -0.95<R3 / R4≤-0.15; and an inner diameter d2m of the image side surface of the second spacer element and an outer diameter D2m of the image side surface of the second spacer element satisfy: 0.60≤d2m / D2m<0.85. By controlling the conditional expressions, the curvature radius of the second lens can be controlled, thereby improving the processing feasibility and production yield of the second lens, reducing the risk of surface shape deviation, distortion, and appearance defects caused by poor forming of the second lens, and the proportion of the inner diameter and the outer diameter of the object side surface of the second spacer element can also be constrained, so that the second spacer element can effectively block the stray light between the second lens and the third lens, improve the stray light, and thereby improve the imaging quality of the optical lens.

[0067] In the embodiment, the lens barrel is composed of a first lens barrel and a second lens barrel, the central axis of the first lens barrel coincides with the Y optical axis, the central axis of the second lens barrel coincides with the X optical axis, and the second lens barrel is movably arranged relative to the prism. By arranging the positions of the first lens barrel and the second lens barrel, the second lens barrel can be moved along the X optical axis to adapt to different object distance conditions, the axial length of the optical lens is compressed, the requirement that the optical lens works in multiple object distance conditions is met, and the optical performance of the optical lens in the macro condition is improved.

[0068] It should be noted that the first lens is arranged in the first lens barrel, and the second lens, the third lens, the fourth lens and the fifth lens are arranged in the second lens barrel. The Y optical axis and the X optical axis intersect at the reflecting surface of the prism.

[0069] In the embodiment, the ratio between the outer diameter D0m of the image side end surface of the first lens barrel and the maximum axial height L of the first lens barrel satisfies 4.65 < D0m / L < 5.35, and the ratio between the effective focal length f1 of the first lens and the effective radius DT11 of the object side surface of the first lens satisfies 4.70 < f1 / DT11 < 7.00. By controlling the above condition formula, the ratio between the outer diameter of the image side end surface of the first lens barrel and the maximum axial height of the first lens barrel is controlled within a reasonable range, so as to ensure the small size of the first lens arranged in the first lens barrel, thereby reducing the screen ratio of the optical lens in the portable electronic device and meeting the miniaturization requirement of the optical lens. Meanwhile, the ratio between the effective focal length of the first lens and the effective radius of the object side surface of the first lens is also constrained within a reasonable range, which is conducive to controlling the surface stability of the first lens, and further ensures that the range of light exiting from the first lens matches the light receiving range of the prism.

[0070] It should be noted that the maximum axial height L of the first lens barrel is the distance between the object side end surface of the first lens barrel and the image side end surface of the first lens barrel in the direction of the Y optical axis.

[0071] In the embodiment, the ratio between the outer diameter D0bs of the object side end surface of the second lens barrel and the inner diameter d0bs of the object side end surface of the second lens barrel satisfies 1.10 < D0bs / d0bs < 1.55, and the ratio between the effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfies 2.45 < f / EPD < 2.95. By controlling the above condition formula, the ratio between the inner and outer diameters of the object side end surface of the second lens barrel and the ratio between the effective focal length of the optical lens and the entrance pupil diameter of the optical lens are controlled, the aperture size of the optical lens is effectively constrained, the light amount of the optical lens is ensured to be sufficient, and the overall light amount of the optical lens is improved, so that the optical lens can also obtain better imaging clarity in a darker environment. Meanwhile, the size of the second lens barrel can be reduced, and the aesthetic appearance of the optical lens is improved.

[0072] In addition, in another optional embodiment of the present application, an optical lens is also provided, comprising a lens barrel, a lens set and a plurality of spacer elements arranged in the lens barrel, the lens set is composed of five lenses with optical power and a prism, the five lenses with optical power include a first lens with positive optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with negative optical power and a fifth lens with positive optical power; the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the object side surface of the second lens is convex, and the image side surface of the second lens is convex; the object side surface of the third lens is convex, and the image side surface of the third lens is concave; the image side surface of the fifth lens is convex; the optical axis of the optical lens includes an X optical axis and a Y optical axis, the first lens is arranged along the Y optical axis from the object side to the prism, the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged along the X optical axis from the prism to the image side, and the X optical axis is perpendicular to the Y optical axis; the prism has an incident surface, a reflection surface and an exit surface, the incident surface is arranged close to the image side surface of the first lens, the exit surface is arranged close to the object side surface of the second lens, the reflection surface is located between the incident surface and the exit surface, light is incident on the prism along the Y optical axis, and is emitted from the prism along the X optical axis after being reflected by the reflection surface; the plurality of spacer elements includes a fourth spacer element arranged between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; wherein the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: -1.75 < f45 / f < -0.90; the dispersion coefficient V4 of the fourth lens, the dispersion coefficient V5 of the fifth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -6.15 mm ≤ V4 / V5×R8 < 8.85 mm and V4 / V5×R8 is not equal to 0; the outer diameter D4s of the object side surface of the fourth spacer element, the inner diameter d4s of the object side surface of the fourth spacer element and the central thickness CT4 of the fourth lens on the X optical axis satisfy: 3.00 < (D4s-d4s) / CT4 < 8.05.

[0073] The optical lens of the present application arranges the positions of the prism and the fourth spacer element and the refractive powers and surface shapes of the five lenses reasonably, and sets -1.75 < f45 / f < -0.90 and -6.15 mm ≤ V4 / V5 x R8 < 8.85 mm and V4 / V5 x R8 is not equal to 0, so that the fourth lens and the fifth lens of the present application have the characteristics of long focal length and low dispersion, but the condensing ability of the fifth lens and the fifth lens is poor, which leads to the inconsistency of the light rays of different wavelengths, and then easily increases the light rays of the edge part of the rear fourth lens, and then leads to the generation of invalid light path, which affects the final imaging quality of the optical lens, especially the MTF defocus curve. Therefore, by constraining 3.00 < (D4s-d4s) / CT4 < 8.05, the ratio of the outer diameter of the object side of the fourth spacer element to the inner and outer diameter difference of the object side of the fourth spacer element and the central thickness of the fourth lens on the X optical axis can be controlled, the light passing through the fourth lens is adjusted, so that the invalid light path reflected at the front end can be effectively intercepted by the fourth spacer element, effectively improving the peak concentration of the MTF defocus curve, which is beneficial to improve the optical performance of the optical lens, and then improve the imaging quality.

[0074] Optionally, the optical lens described above can further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0075] The optical lens in the present application can adopt multiple lenses, for example, the five lenses described above. In the present application, at least one of the mirror surfaces of each lens is a non-spherical mirror surface. The characteristic of the aspherical lens is that the curvature is continuously changed from the center of the lens to the periphery of the lens. Unlike the spherical lens which has constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics, which has the advantages of improving the distortion aberration and improving the astigmatism aberration. After adopting the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0076] Figure 1 The size annotation diagram of the optical lens of the present application is shown, Figure 1 The parameters d2m, D2m, d3s, D3s, d4s, D4s, D0m, d0bs, D0bs, EP23, CP3 and L are marked in the figure, so that the meaning of the parameters can be clearly and intuitively understood. In order to facilitate the description of the optical lens and the surface shape of the specific lens, these parameters will not be embodied in the figure when the specific embodiments are described below.

[0077] The specific surface shape and parameters of the optical lens applicable to the above embodiments are further described below with reference to the drawings.

[0078] It should be noted that there are three examples of Example 1-1, Example 1-2, and Example 1-3 in the following Example One, three examples of Example 2-1, Example 2-2, and Example 2-3 in Example Two, and three examples of Example 3-1, Example 3-2, and Example 3-3 in Example Three. The curvature radius, center thickness, and other parameters of the first lens to the fifth lens of the optical lens in the three examples in the same example are the same, but the thickness, inner diameter, and outer diameter of the first lens barrel, the second lens barrel, the second spacer element to the fourth spacer element are different.

[0079] It should be noted that any one of the following Examples One to Three is applicable to all embodiments of the present application.

[0080] Example One

[0081] As shown in the following, Figures 2 to 7 the optical lens of Example One is described. Figure 2 shows a structural schematic diagram of the optical lens of Example 1-1, Figure 3 shows a structural schematic diagram of the optical lens of Example 1-2, Figure 4 shows a structural schematic diagram of the optical lens of Example 1-3.

[0082] As shown in the following, Figures 2 to 4 the optical lens includes a first lens E1 disposed in a first lens barrel P0 along a Y optical axis, a prism disposed on an image side of the first lens E1, and a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fourth secondary auxiliary spacer element P4c, and a fifth lens E5 disposed in a second lens barrel P0b in order from an object side to an image side along an X optical axis.

[0083] In the present embodiment, the prism has an incident surface S3, an exit surface S4, and a reflecting surface, all of which are planes. Light from the object side enters the prism through the incident surface S3 after passing through the first lens E1 along the direction of the Y optical axis, is then reflected by the reflecting surface of the prism and exits through the exit surface S4 along the direction of the X optical axis, and then passes through the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 in order until the imaging surface of the optical lens.

[0084] As shown in the following, Figure 2Fig. 1-1 shows a structural schematic diagram of the optical lens of Example 1-1. In this example, the object side and image side of the second spacer element P2 are in contact with the image side S6 of the second lens and the object side S7 of the third lens, respectively. The object side and image side of the third spacer element P3 are in contact with the image side S8 of the third lens and the object side S9 of the fourth lens, respectively. The object side and image side of the fourth spacer element P4 are in contact with the image side S10 of the fourth lens and the object side of the fourth auxiliary spacer element P4b, the image side of the fourth auxiliary spacer element P4b is in contact with the object side of the fourth auxiliary spacer element P4c, and the image side of the fourth auxiliary spacer element P4c is in contact with the object side S11 of the fifth lens.

[0085] As shown in Fig. 1-2, a structural schematic diagram of the optical lens of Example 1-2 is shown. In this example, the abutting contact mode of each spacer element is the same as that of Example 1-1, and the relevant description in Example 1-1 can be referred to, which will not be repeated here. Figure 3 As shown in Fig. 1-3, a structural schematic diagram of the optical lens of Example 1-3 is shown. In this example, the abutting contact mode of each spacer element is the same as that of Example 1-1, and the relevant description in Example 1-1 can be referred to, which will not be repeated here.

[0086] Figure 4 In summary, the structural parameters of the optical lens of Example 1 under Example 1-1, Example 1-2, and Example 1-3 are shown in Table 2.

[0087] Table 2

[0088] Table 2

[0089]

[0090] In Example 1, the first lens E1 has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens E2 has positive refractive power, the object side S5 of the second lens is convex, and the image side S6 of the second lens is convex. The third lens E3 has positive refractive power, the object side S7 of the third lens is convex, and the image side S8 of the third lens is concave. The fourth lens E4 has negative refractive power, the object side S9 of the fourth lens is convex, and the image side S10 of the fourth lens is concave. The fifth lens E5 has positive refractive power, the object side S11 of the fifth lens is concave, and the image side S12 of the fifth lens is convex.

[0091] ​In the embodiment one, the Fno of the optical lens is 2.86, the EPD of the optical lens is 4.76 mm, the effective focal length f of the optical lens is 13.62 mm, the effective focal length f1 of the first lens is 21.15 mm, the effective focal length f2 of the second lens is 7.22 mm, the effective focal length f3 of the third lens is 19.97 mm, the effective focal length f4 of the fourth lens is -3.79 mm, the effective focal length f5 of the fifth lens is 10.14 mm, the combined focal length f45 of the fourth lens and the fifth lens is -12.40 mm, the sum of the center thicknesses of all the lenses arranged along the Y optical axis on the Y optical axis CTy is 1.5517 mm, the sum of the center thicknesses of all the lenses arranged along the X optical axis on the X optical axis CTx is 1.9258 mm, the center thickness of the thinnest lens on the optical axis CTa is 0.2849 mm, and the effective radius of the object side of the first lens DT11 is 4.4808 mm.

[0092] Table 3 shows the basic structure parameter table of the optical lens of the embodiment one, wherein the units of the radius of curvature, thickness / distance are millimeters mm. In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the diaphragm, which is located between the prism and the second lens E2. S13 and S14 (not shown in the figure) can be the object side of the filter and the image side of the filter or the object side of the protection glass and the image side of the protection glass. S15 (not shown in the figure) is the imaging surface.

[0093] Table 3

[0094]

[0095] In the embodiment one, the object side and the image side of the first lens E1 to the fifth lens E5 are all aspherical surfaces, and the surface type of each aspherical lens can be defined by using but not limited to the following aspherical surface formula:

[0096] Formula (1).

[0097] Wherein, x is the distance sag of the aspherical surface at a height of h along the optical axis direction from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 4 below gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18 and A20 which can be used for the aspherical surfaces S1-S2, S5-S12 in the embodiment one.

[0098] Table 4

[0099]

[0100] Figure 5 An axial chromatic aberration curve of the optical lens according to Embodiment 1 is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical lens. Figure 6 An astigmatism curve of the optical lens according to Embodiment 1 is shown, which represents the meridional image curvature and sagittal image curvature. Figure 7 A distortion curve of the optical lens according to Embodiment 1 is shown, which represents the distortion size values corresponding to different image heights.

[0101] According to Figures 5 to 7 It can be known that the optical lens provided in Embodiment 1 can achieve good imaging quality.

[0102] Embodiment 2

[0103] As shown in Figures 8 to 13 , the optical lens according to Embodiment 2 is described. Figure 8 A structural schematic diagram of the optical lens according to Embodiment 2-1 is shown, Figure 9 A structural schematic diagram of the optical lens according to Embodiment 2-2 is shown, Figure 10 A structural schematic diagram of the optical lens according to Embodiment 2-3 is shown.

[0104] As shown in Figures 8 to 10 , the optical lens includes a first lens E1 disposed in a first lens barrel P0 along a Y optical axis, further includes a prism disposed on an image side of the first lens E1, and further includes a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fourth secondary auxiliary spacer element P4c, and a fifth lens E5 disposed in a second lens barrel P0b in sequence from an object side to an image side along an X optical axis.

[0105] In this embodiment, the prism has an incident surface S3, an exit surface S4, and a reflecting surface, all of which are planes. Light from the object side enters the prism through the incident surface S3 after passing through the first lens E1 along the direction of the Y optical axis, is then reflected by the reflecting surface of the prism and exits through the exit surface S4 along the direction of the X optical axis, and then passes through the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 in sequence until the imaging surface of the optical lens.

[0106] As shown in Figure 8Fig. 2-1 shows a structural schematic diagram of the optical lens of Example 2-1. In this example, the object side and image side of the second spacer element P2 are in contact with the image side S6 of the second lens and the object side S7 of the third lens, respectively. The object side and image side of the third spacer element P3 are in contact with the image side S8 of the third lens and the object side S9 of the fourth lens, respectively. The object side and image side of the fourth spacer element P4 are in contact with the image side S10 of the fourth lens and the object side of the fourth auxiliary spacer element P4b, the image side of the fourth auxiliary spacer element P4b is in contact with the object side of the fourth auxiliary spacer element P4c, and the image side of the fourth auxiliary spacer element P4c is in contact with the object side S11 of the fifth lens.

[0107] As shown in Fig. 2-2, a structural schematic diagram of the optical lens of Example 2-2 is shown. In this example, the abutting contact mode of each spacer element is the same as that of Example 2-1, and the relevant description in Example 2-1 can be referred to, which will not be repeated here. Figure 9

[0108] As shown in Fig. 2-3, a structural schematic diagram of the optical lens of Example 2-3 is shown. In this example, the abutting contact mode of each spacer element is the same as that of Example 2-1, and the relevant description in Example 2-1 can be referred to, which will not be repeated here. Figure 10

[0109] In summary, the structural parameters of the optical lens of Example 2 under Example 2-1, Example 2-2, and Example 2-3 are shown in Table 5.

[0110] Table 5

[0111]

[0112] In Example 2, the first lens E1 has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens E2 has positive refractive power, the object side S5 of the second lens is convex, and the image side S6 of the second lens is convex. The third lens E3 has negative refractive power, the object side S7 of the third lens is convex, and the image side S8 of the third lens is concave. The fourth lens E4 has negative refractive power, the object side S9 of the fourth lens is convex, and the image side S10 of the fourth lens is concave. The fifth lens E5 has positive refractive power, the object side S11 of the fifth lens is concave, and the image side S12 of the fifth lens is convex.

[0113] ​​In the embodiment two, the Fno of the optical lens is 2.91, the EPD of the optical lens is 4.68mm, the effective focal length f of the optical lens is 13.62mm, the effective focal length f1 of the first lens is 24.69mm, the effective focal length f2 of the second lens is 4.24mm, the effective focal length f3 of the third lens is -7.63mm, the effective focal length f4 of the fourth lens is -7.24mm, the effective focal length f5 of the fifth lens is 18.78mm, the combined focal length f45 of the fourth lens and the fifth lens is -19.43mm, the sum of the central thicknesses of all the lenses arranged along the Y optical axis on the Y optical axis CTy is 1.2162mm, the sum of the central thicknesses of all the lenses arranged along the X optical axis on the X optical axis CTx is 2.3637mm, the central thickness of the thinnest lens on the optical axis CTa is 0.3682mm, and the effective radius of the object side of the first lens DT11 is 3.8507mm.

[0114] Table 6 shows the basic structure parameter table of the optical lens of the embodiment two, wherein the units of the curvature radius and the thickness / distance are millimeter mm. In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the diaphragm, which is located between the prism and the second lens E2. S13 and S14 (not shown in the figure) can be the object side of the filter and the image side of the filter or the object side of the protection glass and the image side of the protection glass. S15 (not shown in the figure) is the imaging surface.

[0115] Table 6

[0116]

[0117] The following table 7 gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of the aspherical surfaces S1-S2, S5-S12 which can be used in the embodiment two. Wherein, the surface type of each aspherical lens is defined according to the formula (1) in the embodiment one.

[0118] Table 7

[0119]

[0120] Figure 11 The axial chromatic aberration curve of the optical lens of the embodiment two is shown, which represents the convergence focal point deviation of light rays of different wavelengths after passing through the optical lens. Figure 12 The astigmatism curve of the optical lens of the embodiment two is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 13 The distortion curve of the optical lens of the embodiment two is shown, which represents the distortion size value corresponding to different image heights.

[0121] According to the above description, the optical lens of the embodiment two has the following advantages: Figures 11 to 13It can be seen that the optical lens given in Embodiment Two can achieve good imaging quality.

[0122] Embodiment Three

[0123] As shown in Figures 14 to 19 , the optical lens of Embodiment Three is described. Figure 14 A structural schematic diagram of the optical lens of Embodiment 3-1 is shown, Figure 15 A structural schematic diagram of the optical lens of Embodiment 3-2 is shown, Figure 16 A structural schematic diagram of the optical lens of Embodiment 3-3 is shown.

[0124] As shown in Figures 14 to 16 , the optical lens includes a first lens E1 disposed in a first lens barrel P0 along a Y optical axis, further includes a prism disposed on an image side of the first lens E1, and further includes a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, and a fifth lens E5 disposed in a second lens barrel P0b in order from an object side to an image side along an X optical axis.

[0125] In this embodiment, the prism has an incident surface S3, an exit surface S4, and a reflecting surface, all of which are planes. Light from the object side enters the prism through the incident surface S3 after passing through the first lens E1 along the direction of the Y optical axis, is then reflected by the reflecting surface of the prism, and exits through the exit surface S4 along the direction of the X optical axis, and then sequentially passes through the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 until reaching the imaging surface of the optical lens.

[0126] As shown in Figure 14 , a structural schematic diagram of the optical lens of Embodiment 3-1 is shown. In this example, the object side surface and the image side surface of the second spacer element P2 are in contact with the image side surface S6 of the second lens and the object side surface S7 of the third lens, respectively. The object side surface and the image side surface of the third spacer element P3 are in contact with the image side surface S8 of the third lens and the object side surface S9 of the fourth lens, respectively. The object side surface and the image side surface of the fourth spacer element P4 are in contact with the image side surface S10 of the fourth lens and the object side surface S11 of the fifth lens, respectively.

[0127] As shown in Figure 15 , a structural schematic diagram of the optical lens of Embodiment 3-2 is shown. In this example, the abutting contact mode of each spacer element is the same as that of Embodiment 3-1, and reference can be made to the related description in Embodiment 3-1, which will not be repeated here.

[0128] As shown in Figure 16The structure of the optical lens of Example 3-3 is shown in the structural schematic diagram. The difference between this example and Example 3-1 is that the third auxiliary spacing element P3b is additionally arranged on the image side of the third spacing element P3, and the object side surface and the image side surface of the third auxiliary spacing element P3b are in contact with the image side surface of the third spacing element P3 and the object side surface S9 of the fourth lens, respectively. The abutting modes of the remaining spacing elements are the same as those of Example 3-1, and the relevant descriptions in Example 3-1 can be referred to, and will not be repeated here.

[0129] In summary, the structural parameters of the optical lens of Example Three under Examples 3-1, 3-2 and 3-3 are shown in Table 8.

[0130] Table 8

[0131]

[0132] In Example Three, the first lens E1 has positive refractive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has positive refractive power, the object side surface S5 of the second lens is convex, and the image side surface S6 of the second lens is convex. The third lens E3 has negative refractive power, the object side surface S7 of the third lens is convex, and the image side surface S8 of the third lens is concave. The fourth lens E4 has negative refractive power, the object side surface S9 of the fourth lens is concave, and the image side surface S10 of the fourth lens is convex. The fifth lens E5 has positive refractive power, the object side surface S11 of the fifth lens is convex, and the image side surface S12 of the fifth lens is convex.

[0133] In Example Three, the aperture value Fno of the optical lens is 2.49, the entrance pupil diameter EPD of the optical lens is 5.48 mm, the effective focal length f of the optical lens is 13.62 mm, the effective focal length f1 of the first lens is 27.37 mm, the effective focal length f2 of the second lens is 4.41 mm, the effective focal length f3 of the third lens is -5.21 mm, the effective focal length f4 of the fourth lens is -6.21 mm, the effective focal length f5 of the fifth lens is 9.43 mm, the combined focal length f45 of the fourth lens and the fifth lens is -23.62 mm, the sum of the center thicknesses CTy of all the lenses arranged along the Y optical axis on the Y optical axis is 1.2410 mm, the sum of the center thicknesses CTx of all the lenses arranged along the X optical axis on the X optical axis is 2.5369 mm, the center thickness CTa of the thinnest lens on the optical axis where it is located is 0.2900 mm, and the effective radius DT11 of the object side surface of the first lens is 3.9182 mm.

[0134] Table 9 shows the basic structure parameter table of the optical lens of Example Three, wherein the units of the radius of curvature, thickness / distance are millimeter mm. In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the stop, which is located between the prism and the second lens E2. S13 and S14 (not shown in the figure) are the object side of the filter and the image side of the filter or the object side of the protection glass and the image side of the protection glass. S15 (not shown in the figure) is the imaging surface.

[0135] Table 9

[0136]

[0137] The following Table 10 gives the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspherical surface S1-S2, S5-S12 which can be used in Example Three. Wherein the surface type of each aspherical lens is defined according to the formula (1) in Example One.

[0138] Table 10

[0139]

[0140] Figure 17 The on-axis chromatic aberration curve of the optical lens of Example Three is shown, which represents the convergence focus deviation of light rays of different wavelengths after passing through the optical lens. Figure 18 The astigmatism curve of the optical lens of Example Three is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 19 The distortion curve of the optical lens of Example Three is shown, which represents the distortion size value corresponding to different image heights.

[0141] According to Figures 17 to 19 It can be seen that the optical lens given in Example Three can achieve good imaging quality.

[0142] In summary, Examples One to Three respectively satisfy the relationships shown in Table 11.

[0143] Table 11

[0144]

[0145] Table 12 shows some optical parameters of the optical lenses of Examples One to Three.

[0146] Table 12

[0147]

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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 barrel comprises a lens barrel, a lens group and a plurality of spacer elements arranged in the lens barrel, The lens group is composed of five lenses with optical power and a prism, the five lenses with optical power include a first lens with positive optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with negative optical power and a fifth lens with positive optical power; the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the object side surface of the second lens is convex, and the image side surface of the second lens is convex; the object side surface of the third lens is convex, and the image side surface of the third lens is concave; the image side surface of the fifth lens is convex; the optical axis of the optical lens includes an X optical axis and a Y optical axis, the first lens is arranged along the Y optical axis from the object side to the prism, and the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged along the X optical axis from the prism to the image side, and the X optical axis is perpendicular to the Y optical axis; The prism has an incident surface, a reflection surface and an exit surface, the incident surface is arranged close to the image side surface of the first lens, the exit surface is arranged close to the object side surface of the second lens, and the reflection surface is located between the incident surface and the exit surface; light is incident to the prism along the Y optical axis, and is emitted from the prism along the X optical axis after being reflected by the reflection surface; The plurality of spacer elements includes a fourth spacer element arranged between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; Wherein, the combination focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: -1.75 < f45 / f < -0.90; the dispersion coefficient V4 of the fourth lens, the dispersion coefficient V5 of the fifth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -6.15 mm < V4 / V5 x R8 < 8.85 mm and V4 / V5 x R8 is not equal to 0; the outer diameter D4s of the object side surface of the fourth spacer element and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: 1.30 < D4s / d4s < 2.

15.

2. The optical lens of claim 1, wherein, The plurality of spacer elements further includes a second spacer element arranged between the second lens and the third lens and in contact with the image side surface of the second lens, and a third spacer element arranged between the third lens and the fourth lens and in contact with the image side surface of the third lens, The interval distance EP23 of the image side surface of the second spacer element to the object side surface of the third spacer element on the X optical axis, the maximum axial thickness CP3 of the third spacer element and the refractive index N3 of the third lens satisfy: 1.60 < EP23 / CP3 x N3 < 44.

90.

3. The optical lens of claim 1, wherein, The plurality of spacer elements further includes a second spacer element arranged between the second lens and the third lens and in contact with the image side surface of the second lens, A center thickness CT2 of the second lens on the X optical axis satisfies: 0.05 < CT2 / R3 < 0.40, where R3 is a radius of curvature of an object side surface of the second lens; and an outer diameter D2m of an image side surface of the second spacer element satisfies: 1.20 < D2m / d2m < 1.70, where d2m is an inner diameter of the image side surface of the second spacer element.

4. The optical lens of claim 1, wherein, A sum CTx of center thicknesses of all lenses arranged along the direction of the X optical axis satisfies: 1.20 < CTx / CTy < 2.05, where CTy is a sum of center thicknesses of all lenses arranged along the direction of the Y optical axis.

5. The optical lens of claim 1, wherein, A lens with a minimum center thickness among the first lens to the fifth lens is a thinnest lens, A center thickness CTa of the thinnest lens on the optical axis on which the thinnest lens is located satisfies: 0.05 ≤ CTa / Das < 0.15, where Das is an outer diameter of an object side surface of a spacer element located on an image side of the thinnest lens and in contact with the image side surface of the thinnest lens.

6. The optical lens of claim 1, wherein, The plurality of spacer elements further includes a third spacer element located between the third lens and the fourth lens and in contact with an image side surface of the third lens, An outer diameter D3s of the object side surface of the third spacer element, an inner diameter d3s of the object side surface of the third spacer element, and an effective focal length f3 of the third lens satisfy: 0.05 ≤ π × (D3s - d3s) / f3 < 2.

35. 2 - d3s 2 / f3 2 < 2.

35.

7. The optical lens of claim 1, wherein, The plurality of spacer elements further includes a second spacer element located between the second lens and the third lens and in contact with an image side surface of the second lens, A radius of curvature R3 of the object side surface of the second lens satisfies: -0.95 < R3 / R4 ≤ -0.15, where R4 is a radius of curvature of the image side surface of the second lens; and an inner diameter d2m of the image side surface of the second spacer element satisfies: 0.60 ≤ d2m / D2m < 0.85, where D2m is an outer diameter of the image side surface of the second spacer element.

8. The optical lens of claim 1, wherein, The lens barrel is composed of a first lens barrel and a second lens barrel, a central axis of the first lens barrel coincides with the Y optical axis, a central axis of the second lens barrel coincides with the X optical axis, and the second lens barrel is movably arranged relative to the prism.

9. The optical lens of claim 8, wherein, An outer diameter D0m of an image side end surface of the first lens barrel satisfies: 4.65 < D0m / L < 5.35, where L is a maximum axial height of the first lens barrel; and an effective focal length f1 of the first lens satisfies: 4.70 < f1 / DT11 < 7.00, where DT11 is an effective radius of an object side surface of the first lens.

10. The optical lens of claim 8, wherein, An outer diameter D0bs of an object side end surface of the second lens barrel satisfies: 1.10 < D0bs / d0bs < 1.55, where d0bs is an inner diameter of the object side end surface of the second lens barrel; and an effective focal length f of the optical lens satisfies: 2.45 < f / EPD < 2.95, where EPD is an entrance pupil diameter of the optical lens.

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