Optical imaging lens

Abstract

The application provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a plurality of spacer elements, the lens group is composed of five lenses with optical power, the optical axis of the optical imaging lens comprises an X optical axis and a Y optical axis, the X optical axis is perpendicular to the Y optical axis; the optical imaging lens further comprises a prism, the prism is located between a first lens and a second lens; 0.10<EPD / (R1+R2)≤0.15 is satisfied; 3.25<d0s / (CT1xN1)<4.95 is satisfied. The application solves the problem that the five-piece optical imaging lens in the prior art controls the relationship between the entrance pupil diameter and the curvature radius of the first lens to meet the demand that the first lens satisfies large light quantity, thereby causing more light to enter and causing the problem of increased stray light and poor relative luminance performance.

Description

Technical Field

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

[0002] In the current field of optical imaging technology, five-element optical imaging lenses are widely used in devices such as smartphones, digital cameras, and surveillance cameras due to their superior image quality and compact structure. However, this design is not without its flaws. To meet the demand for high light throughput—that is, to allow more light to pass through the optical imaging lens to improve image brightness and capture details in low-light environments—designers typically increase the entrance pupil diameter of the optical imaging lens and adjust the radius of curvature of the first lens (i.e., the lens closest to the object being photographed) to increase the light throughput of the first lens. This design can significantly improve the light throughput of the optical imaging lens; however, this design approach may introduce two main problems.

[0003] First, when the relationship between the entrance pupil diameter of the optical imaging lens and the radius of curvature of the first lens is controlled to meet the requirement of high light throughput, more light can enter the optical imaging lens, which also brings more stray light, especially light rays at the edges of the first lens, which may produce a larger angle of refraction, thus increasing the generation of stray light. Stray light refers to light rays that are not directly projected onto the imaging sensor; they can degrade image quality and cause blurring or color distortion.

[0004] Secondly, while a large light throughput increases the amount of light entering the image, it can also lead to poor relative illumination performance in some situations. This is because when the optical imaging lens is designed to be too wide, the light at the edges may have a larger angle of refraction, reducing the effective intensity projected onto the imaging surface. This results in decreased brightness and contrast at the edges of the image, thus lowering the overall relative illumination level. Poor relative illumination performance means that the light distribution is uneven across different parts of the image, with significant differences in brightness between the center and the edges, affecting the final image quality.

[0005] In other words, the existing five-element optical imaging lens has the problem of controlling the relationship between the entrance pupil diameter and the radius of curvature of the first lens to make the first lens meet the requirement of large light transmission, which in turn leads to more light entering, causing increased stray light and poor relative illumination performance. Summary of the Invention

[0006] The main objective of this invention is to provide an optical imaging lens that solves the problems of existing five-element optical imaging lenses, such as the need to control the relationship between the entrance pupil diameter and the radius of curvature of the first lens to meet the requirement of large light transmission, which leads to more light entering and increased stray light and poor relative illumination performance.

[0007] To achieve the above objective, according to one aspect of the present invention, there is provided an optical imaging lens, comprising a lens barrel, a lens group assembled in the lens barrel, and a plurality of spacer elements. The lens group consists of five lenses with optical power, and the five lenses with optical power comprise a first lens with positive optical power, a second lens with optical power, a third lens with optical power, a fourth lens with optical power, and a fifth lens with optical power; the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface; the object-side surface of the third lens is a convex surface; the optical axis of the optical imaging lens comprises an X optical axis and a Y optical axis, and the X optical axis is perpendicular to the Y optical axis; the optical imaging lens further comprises a prism, the prism is located between the first lens and the second lens, the prism has an incident surface, a reflecting 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 reflecting surface is located between the incident surface and the exit surface, light is incident on the prism along the Y optical axis direction, and after being reflected by the reflecting surface, exits from the prism along the X optical axis direction; the lens barrel comprises 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, the first lens is arranged in the first lens barrel along the Y optical axis, the plurality of spacer elements comprise 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 third spacer element arranged between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and 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 second lens, the second spacer element, the third lens, the third spacer element, the fourth lens, the fourth spacer element and the fifth lens are sequentially arranged in the second lens barrel along the X optical axis from the side where the prism is located to the image side of the optical imaging lens; the entrance pupil diameter EPD of the optical imaging lens, the curvature radius R1 of the object-side surface of the first lens and the curvature radius R2 of the image-side surface of the first lens satisfy: 0.10 < EPD / (R1+R2) ≤ 0.15; the inner diameter d0s of the object-side surface of the first lens barrel, the central thickness CT1 of the first lens on the Y optical axis and the refractive index N1 of the first lens satisfy: 3.25 < d0s / (CT1×N1) < 4.95.

[0008] According to another aspect of the present invention, there is also provided an optical imaging lens, comprising a lens barrel, a lens group assembled in the lens barrel and a plurality of spacing elements. The lens group consists of five lenses with optical power, and the five lenses with optical power comprise a first lens with positive optical power, a second lens with optical power, a third lens with optical power, a fourth lens with optical power and a fifth lens with optical power; the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface; the object-side surface of the third lens is a convex surface; the optical axis of the optical imaging lens comprises an X optical axis and a Y optical axis, a prism has an incident surface, a reflecting 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 reflecting surface is located between the incident surface and the exit surface, light is incident on the prism along the direction of the Y optical axis, and exits from the prism along the direction of the X optical axis after being reflected by the reflecting surface; the plurality of spacing elements comprises a second spacing element arranged between the second lens and the third lens and in contact with the image-side surface of the second lens; the lens barrel comprises 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, the first lens is arranged in the first lens barrel along the Y optical axis, the plurality of spacing elements comprises a second spacing element arranged between the second lens and the third lens and in contact with the image-side surface of the second lens, a third spacing element arranged between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacing element arranged between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, the second lens, the second spacing element, the third lens, the third spacing element, the fourth lens, the fourth spacing element and the fifth lens are sequentially arranged in the second lens barrel along the X optical axis from the side where the prism is located to the image side of the optical imaging lens; the air gap T23 between the second lens and the third lens on the X optical axis, the curvature radius R4 of the image-side surface of the second lens and the curvature radius R5 of the object-side surface of the third lens satisfy: -0.10<T23×10 / (R4+R5)<0.25; the spacing distance EP0b2 between the object-side surface of the second lens barrel and the object-side surface of the second spacing element on the X optical axis, the central thickness CT2 of the second lens on the X optical axis and the central thickness CT3 of the third lens on the X optical axis satisfy: 0.55≤EP0b2 / (CT2+CT3)<0.70.

[0009] Further, the inner diameter d0bs of the object-side surface of the second lens barrel and the combined focal length f2345 of the second lens, the third lens, the fourth lens and the fifth lens satisfy: 0.10<d0bs / f2345<0.40.

[0010] Further, the spacing distance G0 between the object-side surface of the first lens barrel and the incident surface of the prism on the Y optical axis and the spacing distance G0b between the exit surface of the prism and the object-side surface of the second lens barrel on the X optical axis satisfy: 0.80<G0 / G0b<1.75.

[0011] Further, the optical imaging lens further includes a prism base, the prism is disposed on the prism base, the reflecting surface of the prism is in contact with the prism base, the image-side surface of the first lens barrel is in contact with the prism base, and among the length Dl of the surface of the prism base on a side away from the first lens along the X optical axis direction, the length Dw of the surface of the prism base on a side facing the first lens along the X optical axis direction, and the height Dh of the prism base along the Y optical axis direction, the following conditional expression is satisfied: 79.85<(Dl+Dw)×Dh<94.60.

[0012] Further, among the air gap T23 between the second lens and the third lens on the X optical axis, the curvature radius R4 of the image-side surface of the second lens, and the curvature radius R5 of the object-side surface of the third lens, the following conditional expression is satisfied: -0.10<T23×10 / (R4+R5)<0.25; among the spacing distance EP0b2 from the object-side surface of the second lens barrel to the object-side surface of the second spacer on the X optical axis, the central thickness CT2 of the second lens on the X optical axis, and the central thickness CT3 of the third lens on the X optical axis, the following conditional expression is satisfied: 0.55≤EP0b2 / (CT2+CT3)<0.70.

[0013] Further, between the inner diameter d2s of the object-side surface of the second spacer and the inner diameter d3s of the object-side surface of the third spacer, the following conditional expression is satisfied: 1.65<(d2s+d3s) / d2s<2.10.

[0014] Further, between the air gap T34 from the third lens to the fourth lens on the X optical axis and the spacing distance Tr3r10 from the object-side surface of the second lens to the image-side surface of the fifth lens on the X optical axis, the following conditional expression is satisfied: 0.10<T34 / Tr3r10≤0.25; between the maximum axial thickness CP3 of the third spacer and the inner diameter d3s of the object-side surface of the third spacer, the following conditional expression is satisfied: 0.00<CP3 / d3s<0.30.

[0015] Further, between the spacing distance EP23 from the image-side surface of the second spacer to the object-side surface of the third spacer on the X optical axis and the on-axis displacement SAG31 from the intersection of the object-side surface of the third lens and the X optical axis to the non-effective radius vertex of the object-side surface of the third lens, the following conditional expression is satisfied: 0.85<EP23 / SAG31<1.30.

[0016] Further, among the outer diameter D3m of the image-side surface of the third spacer, the outer diameter D4s of the object-side surface of the fourth spacer, and the spacing distance EP34 from the image-side surface of the third spacer to the object-side surface of the fourth spacer on the X optical axis, the following conditional expression is satisfied: 11.80<(D3m+D4s) / EP34<17.40.

[0017] Furthermore, the maximum axial thickness CP2 of the second spacer element, the center thickness CT2 of the second lens on the X-ray axis, and the center thickness CT3 of the third lens on the X-ray axis satisfy the following condition: 0.00 <CP2 / (CT2+CT3)<0.55。

[0018] Furthermore, the combined focal length f23 of the second and third lenses, and the inner diameter d2s of the object-side surface of the second spacer element and the inner diameter d3s of the object-side surface of the third spacer element satisfy the following relationship: 0.95 <f23 / (d2s+d3s)<7.90。

[0019] Furthermore, the inner diameter d4s of the object side of the fourth spacer element and the radius of curvature R9 of the object side of the fifth lens satisfy the following condition: -1.55≤d4s / R9<0.40.

[0020] Furthermore, the maximum height Lb of the second lens tube on the X-ray axis, the effective radius DT21 of the object-side surface of the second lens, and the effective radius DT51 of the object-side surface of the fifth lens satisfy the following relationship: 1.30 <Lb / (DT21+DT51)<1.75。

[0021] Furthermore, the effective radius DT21 of the object side of the second lens, the effective radius DT52 of the image side of the fifth lens, the inner diameter d0bm of the image side of the second lens barrel, and the inner diameter d0bs of the object side of the second lens barrel satisfy the following: -0.05<(DT52-DT21) / (d0bm-d0bs)<0.40.

[0022] By applying the technical solution of this invention, this application can control the ratio of EPD / (R1+R2) to increase the light transmission of the first lens while minimizing the impact of aberrations on image quality and ensuring the overall brightness of the optical system. However, at the same time, a larger light transmission means more light can enter the optical imaging lens, which also brings more stray light, leading to an increase in stray light in the first lens. Furthermore, a larger first lens size will reduce the effective intensity of edge light projected onto the imaging surface due to a larger refraction angle, resulting in a decrease in the brightness and contrast of the edge image, thereby reducing the overall relative illumination level. This application, by constraining the relationship between the inner diameter of the object side of the first lens barrel, the central thickness of the first lens on the Y-axis, and the refractive index of the first lens, can control the inner diameter of the object side of the first lens barrel within a reasonable range, thereby controlling the incident angle of light in the first lens. This effectively reduces the reflection of light on the inner wall of the lens barrel and reduces the possibility of stray light entering subsequent lenses. Simultaneously, by limiting the ratio of the above three factors, the light-converging ability of the first lens can be controlled, compensating for the illuminance attenuation in the edge field of view and ensuring that the illuminance in the edge field of view does not decrease significantly. Therefore, by controlling the ratio of d0s / (CT1×N1), it is possible to reduce stray light generation from the first lens while balancing the relative illumination of the optical imaging lens, ultimately improving the imaging quality and image performance of the optical imaging lens. Attached Figure Description

[0023] 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: Figure 1 A dimensioned diagram of an optical imaging lens according to an alternative embodiment of the present invention is shown; Figure 2 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-1 of the present invention is shown; Figure 3 The diagram shows a schematic representation of the optical imaging lens of Embodiments 1-2 of the present invention. Figure 4 The diagram shows the structural schematics of the optical imaging lenses of embodiments 1-3 of the present invention; Figures 5 to 8 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 of the present invention are shown respectively. Figure 9 A schematic diagram of the optical imaging lens of Embodiment 2-1 of the present invention is shown; Figure 10 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-2 of the present invention is shown; Figure 11The diagram shows a schematic representation of the optical imaging lens of Embodiments 2-3 of the present invention. Figures 12 to 15 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 of the present invention are shown respectively. Figure 16 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-1 of the present invention is shown; Figure 17 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-2 of the present invention is shown; Figure 18 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-3 of the present invention is shown; Figures 19 to 22 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 of the present invention are shown respectively. Figure 23 , Figure 24 , Figure 25 and Figure 26 The stray light path diagram, stray light spot diagram, stray light position diagram and relative illumination diagram of the optical imaging lens of Scheme 1 of the present invention when EPD / (R1+R2)=0.12 and d0s / (CT1×N1)=4.83 are shown respectively. Figure 27 , Figure 28 , Figure 29 and Figure 30 The stray light path diagram, stray light spot diagram, stray light position diagram and relative illumination diagram of the optical imaging lens of Comparative Example 1 when EPD / (R1+R2)=0.12 and d0s / (CT1×N1)=5.18 are shown respectively. Figure 31 , Figure 32 , Figure 33 and Figure 34 The stray light path diagram, stray light spot diagram, stray light position diagram and relative illumination diagram of the optical imaging lens of Comparative Example 2 when EPD / (R1+R2)=0.12 and d0s / (CT1×N1)=3.05 are shown respectively. Figure 35 Another dimensioned view of the optical imaging lens of an alternative embodiment of the present invention is shown.

[0024] The above figures include the following reference numerals: 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; P4, Fourth spacer element; P4b, Fourth auxiliary spacer element; P4c, Fourth secondary auxiliary spacer element; S3, Incident surface; S4, Exit surface. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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; when the R value is infinity, it is determined to be flat.

[0031] In this application, the object side refers to the side of the optical imaging lens facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical imaging lens facing the imaging plane (not shown in the figure). hereinafter, the object side of a lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of a lens refers to the surface of the lens facing the imaging plane (not shown in the figure).

[0032] To address the problem in existing five-element optical imaging lenses that require controlling the relationship between the entrance pupil diameter and the radius of curvature of the first lens to meet the requirement of high light throughput, which leads to increased stray light and poor relative illumination performance due to more light entering the lens, this invention provides an optical imaging lens.

[0033] like Figures 1 to 26 , Figure 35As shown, in an alternative implementation of the present application, the optical imaging lens includes a lens barrel, a lens group assembled in the lens barrel, and a plurality of spacing elements. The lens group consists of five lenses with optical power, and the five lenses with optical power include a first lens with positive optical power, a second lens with optical power, a third lens with optical power, a fourth lens with optical power, and a fifth lens with optical power; the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface; the object-side surface of the third lens is a convex surface; the optical axis of the optical imaging lens includes an X optical axis and a Y optical axis, and the X optical axis is perpendicular to the Y optical axis; the optical imaging lens further includes a prism, the prism is located between the first lens and the second lens, the prism has an incident surface, a reflecting 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 reflecting surface is located between the incident surface and the exit surface, light is incident on the prism along the Y optical axis direction, and is reflected by the reflecting surface and exits from the prism along the X optical axis direction; the lens barrel includes 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, the first lens is arranged in the first lens barrel along the Y optical axis, the plurality of spacing elements include a second spacing element arranged between the second lens and the third lens and in contact with the image-side surface of the second lens, a third spacing element arranged between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacing element arranged between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, the second lens, the second spacing element, the third lens, the third spacing element, the fourth lens, the fourth spacing element and the fifth lens are sequentially arranged in the second lens barrel from the side where the prism is located to the image side of the optical imaging lens along the X optical axis; the entrance pupil diameter EPD of the optical imaging lens, the curvature radius R1 of the object-side surface of the first lens, and the curvature radius R2 of the image-side surface of the first lens satisfy: 0.10<EPD / (R1+R2)≤0.15; the inner diameter d0s of the object-side surface of the first lens barrel, the central thickness CT1 of the first lens on the Y optical axis, and the refractive index N1 of the first lens satisfy: 3.25<d0s / (CT1×N1)<4.95.

[0034] This application, by controlling the ratio of EPD / (R1+R2), can increase the light transmission of the first lens while minimizing the impact of aberrations on image quality, thus ensuring the overall brightness of the optical system. However, a larger light transmission means more light can enter the optical imaging lens, which also brings more stray light, leading to an increase in stray light in the first lens. Furthermore, a larger first lens size reduces the effective intensity of edge light projected onto the imaging surface due to a larger refraction angle, resulting in decreased brightness and contrast of the edge image, thereby reducing the overall relative illumination level. This application, by constraining the relationship between the inner diameter of the object side of the first lens barrel, the central thickness of the first lens on the Y-axis, and the refractive index of the first lens, can control the inner diameter of the object side of the first lens barrel within a reasonable range, thereby controlling the incident angle of light in the first lens. This effectively reduces light reflection on the inner wall of the lens barrel, lowering the possibility of stray light entering subsequent lenses. Simultaneously, by limiting the ratio of these three factors, the light-converging ability of the first lens can be controlled, compensating for the illuminance attenuation in the edge field of view and ensuring that the illuminance in the edge field of view does not decrease significantly. Therefore, by controlling the ratio of d0s / (CT1×N1), it is possible to reduce stray light generation from the first lens while balancing the relative illumination of the optical imaging lens, ultimately improving the imaging quality and image performance of the optical imaging lens. It should be noted that the Y-axis and X-axis intersect at the reflecting surface of the prism.

[0035] In addition, please refer to Table 1 below. Figures 23 to 34 As shown, Figure 23 , Figure 24 , Figure 25 and Figure 26 The stray light path diagram, stray light spot diagram, stray light position diagram and relative illumination diagram of the optical imaging lens of Scheme 1 of the present invention are shown respectively when EPD / (R1+R2)=0.12 and d0s / (CT1×N1)=4.83. Figure 27 , Figure 28 , Figure 29 and Figure 30 The stray light path diagram, stray light spot diagram, stray light position diagram and relative illumination diagram of the optical imaging lens of Comparative Example 1 when EPD / (R1+R2)=0.12 and d0s / (CT1×N1)=5.18 are shown respectively. Figure 31 , Figure 32 , Figure 33 and Figure 34 The stray light path diagram, stray light spot diagram, stray light position diagram and relative illumination diagram of the optical imaging lens of Comparative Example 2 when EPD / (R1+R2)=0.12 and d0s / (CT1×N1)=3.05 are shown respectively.

[0036] Depend on Figures 23 to 34As shown, when the optical imaging lens satisfies EPD / (R1+R2)=0.12 and d0s / (CT1×N1)=4.83, it can be known from the stray light spot diagram, stray light optical path diagram and stray light position schematic diagram that the stray light spot is small and appears at the edge of the image, so stray light has little influence on imaging. It can be known from the relative illumination diagram that the relative illumination is high and the performance is good. When the optical imaging lens satisfies EPD / (R1+R2)=0.12 and d0s / (CT1×N1)=5.18, it can be known from the relative illumination diagram that the relative illumination is high and meets the design requirements, but it can be known from the stray light spot diagram, stray light optical path diagram and stray light position schematic diagram that the stray light spot appears at a position close to the center of the image, so stray light has a great influence on imaging and the performance is poor. When the optical imaging lens satisfies EPD / (R1+R2)=0.12 and d0s / (CT1×N1)=3.05, it can be known from the stray light spot diagram, stray light optical path diagram and stray light position schematic diagram that the stray light spot appears at the edge of the image, so stray light has little influence on imaging, but it can be known from the relative illumination diagram that the relative illumination is low, dropping to about 25%, which does not meet the design requirements and the performance is poor. It can be seen that when 0.10<EPD / (R1+R2)≤0.15 and 3.25<d0s / (CT1×N1)<4.95 are satisfied, on the basis that the optical imaging lens meets the relative illumination requirements, the stray light spot is small and located at the edge of the imaging image, which has little influence on imaging. Therefore, by restricting 0.10<EPD / (R1+R2)≤0.15 and 3.25<d0s / (CT1×N1)<4.95, the present application can not only ensure the relative illumination of the optical imaging lens, but also avoid excess stray light, reduce the possibility of stray light entering subsequent lenses, and improve the imaging quality of the optical imaging lens.

[0037] Table 1

[0038] In this embodiment, between the inner diameter d0bs of the object side surface of the second lens barrel and the combined focal length f2345 of the second lens, the third lens, the fourth lens and the fifth lens, the following condition is satisfied: 0.10<d0bs / f2345<0.40. Restricting this conditional expression is beneficial to control the relationship between the inner diameter of the object side surface of the second lens barrel and the effective focal length of the second lens, the third lens, the fourth lens and the fifth lens, and can control the size of the optical imaging lens on the premise of ensuring performance parameters, thereby reducing the overall length and height after the module is integrated with the optical imaging lens, which is conducive to realizing a thin and miniaturized product; meanwhile, it ensures that the light emitted from the exit surface of the prism can enter the rear lens group at an appropriate incident angle, avoiding aberration and light loss caused by excessively large or small incident angles, thereby improving the utilization rate of light and the clarity of imaging.

[0039] In this embodiment, the spacing distance G0 between the object side surface of the first lens barrel and the incident surface of the prism on the Y optical axis and the spacing distance G0b between the exit surface of the prism and the object side surface of the second lens barrel on the X optical axis satisfy: 0.80<G0 / G0b<1.75. Restricting this conditional expression can meet the limit size requirements for the assembly among the first lens barrel, the prism and the second lens barrel, and enable the optical imaging lens to be miniaturized as much as possible. Meanwhile, appropriate spacing distances can reduce such phenomena as reflection and diffraction of light between lenses, thereby reducing the occurrence of problems such as aberration and distortion, and improving the imaging quality of the optical imaging lens.

[0040] In this embodiment, the optical imaging lens further comprises a prism base, the prism is arranged on the prism base, the reflecting surface of the prism is in contact with the prism base, the image side surface of the first lens barrel is in contact with the surface of the prism base facing the first lens barrel, and the length Dl of the surface of the prism base away from the first lens along the X optical axis direction, the length Dw of the surface of the prism base facing the first lens along the X optical axis direction and the height Dh of the prism base along the Y optical axis direction satisfy: 79.85<(Dl+Dw)×Dh<94.60. Restricting this conditional expression can effectively improve the assembly stability of the prism and the first lens barrel. Furthermore, it can greatly reduce unstable eccentricity caused by assembly after light turning, which helps improve the assembly stability of the front-end lens and is beneficial to improving imaging quality.

[0041] In this embodiment, the air gap T23 between the second lens and the third lens on the X optical axis, the curvature radius R4 of the image side surface of the second lens and the curvature radius R5 of the object side surface of the third lens satisfy: -0.10<T23×10 / (R4+R5)<0.25; the spacing distance EP0b2 between the object side surface of the second lens barrel and the object side surface of the second spacer on the X optical axis, the central thickness CT2 of the second lens on the X optical axis and the central thickness CT3 of the third lens on the X optical axis satisfy: 0.55≤EP0b2 / (CT2+CT3)<0.70. Controlling T23×10 / (R4+R5) ensures that the gap between the second lens and the third lens is small and the difference in curvature radii is large, which can meet the miniaturization design requirements of the optical imaging lens. However, in this case, the deformation of the second lens and the third lens is relatively large, which brings certain risks to the molding of the second lens and the third lens. Controlling 0.55≤EP0b2 / (CT2+CT3)<0.70 can restrict the thickness ratio and bending degree of the second lens and the third lens within a reasonable range, reduce the deformation of the two lenses, and ensure the molding process stability of the two lenses.

[0042] In this embodiment, the inner diameter d2s of the object-side surface of the second spacer element and the inner diameter d3s of the object-side surface of the third spacer element satisfy: 1.65<(d2s+d3s) / d2s<2.10. By limiting this conditional expression, the deflection angle of light before and after passing through the third lens can be controlled, so that the sensitivity of the third lens can be controlled, and the overall sensitivity of the optical imaging lens can be reduced. At the same time, it can also effectively control the angle at which light enters the fourth lens, effectively suppress the generation of stray light, which is beneficial to improving the image definition.

[0043] In this embodiment, the air gap T34 between the third lens and the fourth lens on the X optical axis and the spacing distance Tr3r10 from the object-side surface of the second lens to the image-side surface of the fifth lens on the X optical axis satisfy: 0.10<T34 / Tr3r10≤0.25; the maximum axial thickness CP3 of the third spacer element and the inner diameter d3s of the object-side surface of the third spacer element satisfy: 0.00<CP3 / d3s<0.30. By controlling the ratio range of T34 / Tr3r10 and reasonably setting the air gap of the lenses at the rear end of the optical imaging lens, the field curvature generated by the front-end lenses can be compensated, the imaging surface can be flatter, and the aberration distribution of the optical imaging lens can be effectively balanced. However, when the air gap between the third lens and the fourth lens is large, light is more likely to reach the edge of the lenses when passing through these two lenses, resulting in the generation of stray light. By controlling the ratio of CP3 / d3s, the inner diameter and thickness-to-thickness ratio of the third spacer element can be controlled, the propagation path of light between the lenses can be optimized, which is conducive to the third spacer element blocking stray light, thereby improving the imaging definition of the optical imaging lens.

[0044] In this embodiment, the spacing distance EP23 from the image-side surface of the second spacer element to the object-side surface of the third spacer element on the X optical axis and the on-axis displacement SAG31 between the intersection of the object-side surface of the third lens and the X optical axis and the non-effective radius vertex of the object-side surface of the third lens satisfy: 0.85<EP23 / SAG31<1.30. Limiting this conditional expression can control the on-axis displacement on the X optical axis from the image-side surface of the second spacer element to the object-side surface of the third spacer element, which can ensure that the thickness-to-thickness ratio of the third lens is moderate; meanwhile, by controlling SAG31, it can ensure that the shape of the third lens is not excessively curved, and guarantee the molding processability of the third lens.

[0045] In this embodiment, among the outer diameter D3m of the image-side surface of the third spacer element, the outer diameter D4s of the object-side surface of the fourth spacer element, and the spacing distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the X optical axis, the following condition is satisfied: 11.80<(D3m+D4s) / EP34<17.40. By constraining this conditional expression, the ratio of the outer diameter to the edge thickness of the fourth lens can be controlled, thereby improving the processability of the fourth lens, which is beneficial to reducing surface deviation, distortion and appearance problems caused by molding, and improving the production yield of the fourth lens; at the same time, it can also control the outer diameter difference between the second lens and the fourth lens, ensure assembly stability, and improve the overall performance of the optical imaging lens.

[0046] In this embodiment, among the maximum axial thickness CP2 of the second spacer element, the central thickness CT2 of the second lens on the X optical axis and the central thickness CT3 of the third lens on the X optical axis, the following condition is satisfied: 0.00<CP2 / (CT2+CT3)<0.55. Through this conditional expression, it is ensured that the central thickness and edge thickness of the second lens and the third lens can be in a relatively reasonable range, reducing the risk of weld lines during molding of the second lens and the third lens, thereby reducing the risk of stray light caused by weld lines, improving the imaging cleanliness of the optical imaging lens, and at the same time reducing the demolding force when the plastic lens is demolded after molding, reducing the situation that the surface profile deviates from the design curve caused by lens demolding deformation, which is beneficial to improving the MTF quality of the optical imaging lens.

[0047] In this embodiment, among the combined focal length f23 of the second lens and the third lens, the inner diameter d2s of the object-side surface of the second spacer element and the inner diameter d3s of the object-side surface of the third spacer element, the following condition is satisfied: 0.95<f23 / (d2s+d3s)<7.90. Constraining this conditional expression is beneficial to controlling the combined focal length of the second lens and the third lens, and can improve the smoothness and moldability of the optically effective surfaces of the two lenses; in addition, controlling the inner diameters of the object-side surfaces of the second spacer element and the third spacer element can reduce cross-shaped stray light and trailing stray light reflected by the inner diameter surface of the spacer elements, thereby improving imaging quality. The optically effective surface herein is an aspheric surface used for transmitting effective light.

[0048] In this embodiment, between the inner diameter d4s of the object-side surface of the fourth spacer element and the curvature radius R9 of the object-side surface of the fifth lens, the following condition is satisfied: -1.55≤d4s / R9<0.40. By constraining this conditional expression, it can block light outside the field of view and improve the performance of the outer field of view, and ensure that the relative illumination is not too low, so that the picture brightness is relatively uniform, ensuring sufficient brightness of the optical imaging lens, and at the same time it can limit the size of the fifth lens and ensure the miniaturization of the optical imaging lens.

[0049] In this embodiment, the maximum height Lb of the second lens barrel on the optical axis satisfies the following condition among the effective radius DT21 of the object side surface of the second lens and the effective radius DT51 of the object side surface of the fifth lens: 1.30<Lb / (DT21+DT51)<1.75. Through this conditional expression, the dimension from the object side surface of the second lens to the object side surface of the second lens barrel and the dimension from the image side surface of the fifth lens to the image side surface of the second lens barrel can be controlled, which ensures the bearing thickness of the second lens and the glue dispensing space at the rear end of the fifth lens, helps improve the overall assembly stability of the optical imaging lens, ensures the appearance of the two lenses, and facilitates cooperation with other structures.

[0050] It should be noted that the maximum height Lb of the second lens barrel on the optical axis is specifically the separation distance between the object side surface of the second lens barrel and the image side surface of the second lens barrel on the optical axis.

[0051] In this embodiment, the effective radius DT21 of the object side surface of the second lens, the effective radius DT52 of the image side surface of the fifth lens, the inner diameter d0bm of the image side surface of the second lens barrel and the inner diameter d0bs of the object side surface of the second lens barrel satisfy the following condition: -0.05<(DT52-DT21) / (d0bm-d0bs)<0.40. Constraining this conditional expression can constrain the trend of light passing from the first lens to the fifth lens and ensure the assembly stability of the optical imaging lens; it can ensure that the exit height of light after passing through the fifth lens is relatively high, while constrain the outer dimension of the second lens barrel and ensure the miniaturization of the whole.

[0052] In addition, in another optional embodiment of the present application, there is further provided an optical imaging lens, comprising a lens barrel, a lens group assembled in the lens barrel and a plurality of spacing elements, wherein the lens group consists of five lenses with optical power, and the five lenses with optical power comprise a first lens with positive optical power, a second lens with optical power, a third lens with optical power, a fourth lens with optical power and a fifth lens with optical power; an object side surface of the first lens is a convex surface, and an image side surface of the first lens is a concave surface; an object side surface of the third lens is a convex surface; an optical axis of the optical imaging lens comprises an X optical axis and a Y optical axis, and the X optical axis is perpendicular to the Y optical axis; the optical imaging lens further comprises a prism, the prism is located between the first lens and the second lens, the prism is provided with an incident surface, a reflecting 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 reflecting surface is located between the incident surface and the exit surface, light is incident to the prism along the direction of the Y optical axis, is reflected by the reflecting surface and exits from the prism along the direction of the X optical axis; the plurality of spacing elements comprise a second spacing element arranged between the second lens and the third lens and in contact with the image side surface of the second lens; the lens barrel comprises 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, the first lens is arranged in the first lens barrel along the Y optical axis, the plurality of spacing elements comprise a second spacing element arranged between the second lens and the third lens and in contact with the image side surface of the second lens, a third spacing element arranged between the third lens and the fourth lens and in contact with the image side surface of the third lens, and a fourth spacing element arranged between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, the second lens, the second spacing element, the third lens, the third spacing element, the fourth lens, the fourth spacing element and the fifth lens are sequentially arranged in the second lens barrel along the X optical axis from a side where the prism is located to an image side of the optical imaging lens; an air gap T23 of the second lens and the third lens on the X optical axis, a curvature radius R4 of the image side surface of the second lens and a curvature radius R5 of the object side surface of the third lens satisfy: -0.10<T23×10 / (R4+R5)<0.25; a spacing distance EP0b2 between an object side surface of the second lens barrel and an object side surface of the second spacing element on the X optical axis, a central thickness CT2 of the second lens on the X optical axis and a central thickness CT3 of the third lens on the X optical axis satisfy: 0.55≤EP0b2 / (CT2+CT3)<0.70.

[0053] By controlling -0.10<T23×10 / (R4+R5)<0.25, the gap between the second lens and the third lens is small and the difference in curvature radii is large, which can meet the miniaturization design requirements of the optical imaging lens. However, at this time, the deformations of the second lens and the third lens are relatively large, which poses certain risks to the molding of the second lens and the third lens. By controlling 0.55≤EP0b2 / (CT2+CT3)<0.70, the thickness ratio and bending degree of the second lens and the third lens can be constrained within a reasonable range, reducing the deformation of the two lenses and ensuring the stability of the molding process of the two lenses.

[0054] Of course, this embodiment may also include other parameter expressions in the above embodiments, which will not be repeated one by one here.

[0055] Optionally, the above optical imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0056] In the present application, at least one of the mirror surfaces of each lens is an aspheric mirror surface. The aspheric lens is characterized in that: from the center of the lens to the periphery of the lens, the curvature changes continuously. Different from a spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, the aspheric lens has better curvature radius characteristics, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspheric lens, the aberrations occurring during imaging can be eliminated as much as possible, thereby improving imaging quality.

[0057] Figure 1 shows a dimensional marking diagram of an optional embodiment of the optical imaging lens of the present invention, Figure 1 d2s, d3s, D3m, d4s, D4s, d0s, d0bs, d0bm, G0, G0b, EP0b2, CP2, EP23, CP3, EP34, Lb, Dl, Dw, Dh are marked in the diagram, Figure 35 shows another dimensional marking diagram of an optional embodiment of the optical imaging lens of the present invention, Figure 35 SAG31, DT21, DT51, DT52 are marked in the diagram, so that the meaning of the parameter can be clearly and intuitively understood. In order to facilitate the description of the surface shapes of the optical imaging lens and specific lenses, when specific embodiments are described subsequently, these parameters will not be shown in the drawings any more.

[0058] Examples of specific surface shapes and parameters of the optical imaging lens applicable to the above embodiments will be further described below with reference to the accompanying drawings.

[0059] It should be noted that in the following Embodiment 1, there are three examples: Embodiment 1-1, Embodiment 1-2, and Embodiment 1-3; in Embodiment 2, there are three examples: Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3; and in Embodiment 3, there are three examples: Embodiment 3-1, Embodiment 3-2, and Embodiment 3-3. In the three examples within the same embodiment, the radii of curvature, center thickness, and other parameters of the optical imaging lens from the first to the fifth lens, as well as the spacing distance between the lenses and the higher-order coefficients, are the same. However, the thickness, inner diameter, and outer diameter of the first lens barrel, the second lens barrel, and the second to fourth spacers are different.

[0060] It should be noted that any one of the examples in Embodiments 1 to 3 described below is applicable to all implementations of this application.

[0061] Example 1 like Figures 2 to 8 As shown, the optical imaging lens of Embodiment 1 is described. Figure 2 A schematic diagram of the optical imaging lens of Embodiment 1-1 is shown. Figure 3 The diagram shows the structure of the optical imaging lens in Embodiments 1-2. Figure 4 A schematic diagram of the optical imaging lens of Embodiments 1-3 is shown.

[0062] like Figures 2 to 4 As shown, the optical imaging lens includes a first lens E1 disposed along the Y-axis in the first lens barrel P0, and a prism and a prism base disposed on the image side of the first lens E1. The prism is disposed on the prism base and the reflecting surface of the prism is in contact with the prism base. It also 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 sequentially along the X-axis from the object side to the image side in the second lens barrel P0b.

[0063] In this embodiment, the prism has an incident surface S3, an exit surface S4, and a reflecting surface. The incident surface S3, the exit surface S4, and the reflecting surface are all planar. Light rays from the object side pass through the first lens E1 along the Y-axis and then enter the prism through the incident surface S3. After being reflected by the reflecting surface of the prism, they exit through the exit surface S4 along the X-axis and then pass through the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 in sequence until they reach the imaging surface of the optical imaging lens.

[0064] like Figure 2The diagram shows a schematic representation of the optical imaging lens in Embodiment 1-1. In this example, the object-side and image-side surfaces 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 and image-side surfaces 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 and image-side surfaces 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.

[0065] like Figure 3 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 1-2. In this example, the contact method of each spacer element is the same as that of Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0066] like Figure 4 The diagram shown is a structural schematic of the optical imaging lens of Embodiments 1-3. In this example, the contact method of each spacer element is the same as that of Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0067] In summary, the structural parameters of the optical imaging lens of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 2.

[0068] Table 2

[0069] In Embodiment 1, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The third lens E3 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fourth lens E4 has positive optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The fifth lens E5 has negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is concave.

[0070] In Embodiment 1, the effective focal length f of the optical imaging lens is 13.62mm, the effective focal length f1 of the first lens is 26.34mm, the effective focal length f2 of the second lens is -8.49mm, the effective focal length f3 of the third lens is 4.08mm, the effective focal length f4 of the fourth lens is 9.89mm, the effective focal length f5 of the fifth lens is -3.84mm, the combined focal length f23 of the second and third lenses is 7.71mm, and the combined focal length f2345 of the second, third, fourth, and fifth lenses is 33.21mm.

[0071] Table 3 shows the basic structural parameters of the optical imaging lens in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, located between the prism and the second lens E2. S13 and S14 (not shown in the figure) can be the object-side side and image-side side of the filter, or the object-side side and image-side side of the protective glass. S15 (not shown in the figure) is the imaging plane.

[0072] Table 3

[0073] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the fifth lens E5 are both aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula: Formula (1).

[0074] 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 3 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the aspherical mirrors S1-S2, S5-S12 in Example 1.

[0075] Table 4

[0076] Figure 5 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 6 The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 7 The distortion curve of the optical imaging lens of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 8 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0077] according to Figures 5 to 8 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0078] Example 2 like Figures 9 to 15 As shown, the optical imaging lens of Embodiment 2 is described. Figure 9A schematic diagram of the optical imaging lens of Embodiment 2-1 is shown. Figure 10 A schematic diagram of the optical imaging lens of Embodiment 2-2 is shown. Figure 11 A schematic diagram of the optical imaging lens of Embodiments 2-3 is shown.

[0079] like Figures 9 to 11 As shown, the optical imaging lens includes a first lens E1 disposed along the Y-axis in the first lens barrel P0, and a prism and a prism base disposed on the image side of the first lens E1. The prism is disposed on the prism base and the reflecting surface of the prism is in contact with the prism base. It also 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, and a fifth lens E5 disposed sequentially along the X-axis from the object side to the image side in the second lens barrel P0b.

[0080] In this embodiment, the prism has an incident surface S3, an exit surface S4, and a reflecting surface. The incident surface S3, the exit surface S4, and the reflecting surface are all planar. Light rays from the object side pass through the first lens E1 along the Y-axis and then enter the prism through the incident surface S3. After being reflected by the reflecting surface of the prism, they exit through the exit surface S4 along the X-axis and then pass through the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 in sequence until they reach the imaging surface of the optical imaging lens.

[0081] like Figure 9 The diagram shows a schematic of the optical imaging lens in Embodiment 2-1. In this example, a fourth auxiliary spacer element P4c is also provided on the image side of the fourth auxiliary spacer element P4b. 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, respectively. 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.

[0082] like Figure 10 The diagram shown is a schematic representation of the optical imaging lens in Embodiment 2-2. In this example, the contact method of each spacer element is the same as in Embodiment 2-1, and can be found in the relevant description in Embodiment 2-1, which will not be repeated here.

[0083] like Figure 11The diagram shown is a schematic representation of the optical imaging lens in Embodiment 2-3. The difference between this example and Embodiment 2-1 is that the fourth auxiliary spacing element P4c is not provided. In this case, the image-side surface of the fourth auxiliary spacing element P4b contacts the object-side surface S11 of the fifth lens. The contact methods of the remaining spacing elements are the same as in Embodiment 2-1, and can be found in the relevant description in Embodiment 2-1, which will not be repeated here.

[0084] In summary, the structural parameters of the optical imaging lens of Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are shown in Table 5.

[0085] Table 5

[0086] 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 concave. The second lens E2 has negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is concave. The third lens E3 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave. The fourth lens E4 has positive optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The fifth lens E5 has negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex.

[0087] In Embodiment 2, the effective focal length f of the optical imaging lens is 13.64 mm, the effective focal length f1 of the first lens is 19.23 mm, the effective focal length f2 of the second lens is -11.93 mm, the effective focal length f3 of the third lens is 8.45 mm, the effective focal length f4 of the fourth lens is 15.30 mm, the effective focal length f5 of the fifth lens is -64.06 mm, the combined focal length f23 of the second and third lenses is 43.26 mm, and the combined focal length f2345 of the second, third, fourth, and fifth lenses is 19.57 mm.

[0088] Table 6 shows the basic structural parameters of the optical imaging lens in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, located between the prism and the second lens E2. S13 and S14 (not shown in the figure) can be the object-side side and image-side side of the filter, or the object-side side and image-side side of the protective glass. S15 (not shown in the figure) is the imaging plane.

[0089] Table 6

[0090] Table 7 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror S1-S2, S5-S12 in Example 2.

[0091] Table 7

[0092] Figure 12 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 13 The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14 The distortion curve of the optical imaging lens of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 15 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0093] according to Figures 12 to 15 It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0094] Example 3 like Figures 16 to 22 As shown, the optical imaging lens of Embodiment 3 is described. Figure 16 A schematic diagram of the optical imaging lens of Embodiment 3-1 is shown. Figure 17 A schematic diagram of the optical imaging lens of Embodiment 3-2 is shown. Figure 18 A schematic diagram of the optical imaging lens of Embodiment 3-3 is shown.

[0095] like Figures 16 to 18 As shown, the optical imaging lens includes a first lens E1 disposed along the Y-axis in the first lens barrel P0, and a prism and a prism base disposed on the image side of the first lens E1. The prism is disposed on the prism base and the reflecting surface of the prism is in contact with the prism base. It also 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 sequentially along the X-axis from the object side to the image side in the second lens barrel P0b.

[0096] In this embodiment, the prism has an incident surface S3, an exit surface S4, and a reflecting surface. The incident surface S3, the exit surface S4, and the reflecting surface are all planar. Light rays from the object side pass through the first lens E1 along the Y-axis and then enter the prism through the incident surface S3. After being reflected by the reflecting surface of the prism, they exit through the exit surface S4 along the X-axis and then pass through the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 in sequence until they reach the imaging surface of the optical imaging lens.

[0097] like Figure 16 The diagram shows a schematic of the optical imaging lens in Embodiment 3-1. 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, respectively. The object-side and image-side of the fourth auxiliary spacer element P4c are in contact with the image-side of the fourth auxiliary spacer element P4b and the object-side S11 of the fifth lens, respectively.

[0098] like Figure 17 The diagram shown is a schematic representation of the optical imaging lens in Embodiment 3-2. In this example, the contact method of each spacer element is the same as in Embodiment 3-1, and can be found in the relevant description in Embodiment 3-1, which will not be repeated here.

[0099] like Figure 18 The diagram shown is a schematic representation of the optical imaging lens in Embodiment 3-3. In this example, the contact method of each spacer element is the same as in Embodiment 3-1, and can be found in the relevant description in Embodiment 3-1, which will not be repeated here.

[0100] In summary, the structural parameters of the optical imaging lens of Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are shown in Table 8.

[0101] Table 8

[0102] 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 concave. The second lens E2 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The third lens E3 has negative optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave. The fourth lens E4 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The fifth lens E5 has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex.

[0103] In Embodiment 3, the effective focal length f of the optical imaging lens is 13.64 mm, the effective focal length f1 of the first lens is 98.24 mm, the effective focal length f2 of the second lens is 5.68 mm, the effective focal length f3 of the third lens is -12.44 mm, the effective focal length f4 of the fourth lens is -6.63 mm, the effective focal length f5 of the fifth lens is 12.71 mm, the combined focal length f23 of the second and third lenses is 8.35 mm, and the combined focal length f2345 of the second, third, fourth, and fifth lenses is 14.21 mm.

[0104] Table 9 shows the basic structural parameters of the optical imaging lens in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, located between the prism and the second lens E2. S13 and S14 (not shown in the figure) can be the object-side side and image-side side of the filter, or the object-side side and image-side side of the protective glass. S15 (not shown in the figure) is the imaging plane.

[0105] Table 9

[0106] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror S1-S2, S5-S12 in Example 3.

[0107] Table 10

[0108] Figure 19 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 20 The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 21The distortion curve of the optical imaging lens of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 22 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0109] according to Figures 19 to 22 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0110] In summary, Examples 1 to 3 satisfy the relationships shown in Table 11.

[0111] Table 11

[0112] Table 12 shows some optical parameters of the optical imaging lenses in various embodiments. Here, f is the effective focal length of the optical imaging lens.

[0113] Table 12

[0114] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical imaging lens, characterized in that, It includes a lens barrel and a lens assembly and multiple spacer elements assembled within the lens barrel. The lens group consists of five lenses with optical power, including a first lens with positive optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive 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 third lens is convex. The optical powers of the second, third, fourth, and fifth lenses are negative-positive-positive-negative or positive-negative-negative-positive, respectively. The optical axis of the optical imaging lens includes an X-axis and a Y-axis, and the X-axis is perpendicular to the Y-axis. The optical imaging lens further includes a prism located between the first lens and the second lens. The prism has an incident surface, a reflecting surface, and an exit surface. The incident surface is disposed near the image side of the first lens, and the exit surface is disposed near the object side of the second lens. The reflecting surface is located between the incident surface and the exit surface. Light rays are incident on the prism along the Y-axis and, after being reflected by the reflecting surface, exit the prism along the X-axis. The lens barrel includes a first lens barrel and a second lens barrel. The central axis of the first lens barrel coincides with the Y-axis, and the central axis of the second lens barrel coincides with the X-axis. The first lens is disposed in the first lens barrel along the Y-axis. The plurality of spacers include a second spacer placed between the second lens and the third lens and in contact with the image side of the second lens, a third spacer placed between the third lens and the fourth lens and in contact with the image side of the third lens, and a fourth spacer placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens. The second lens, the second spacer, the third lens, the third spacer, the fourth lens, the fourth spacer, and the fifth lens are sequentially disposed in the second lens barrel along the X-axis from the side where the prism is located to the image side of the optical imaging lens. Between the entrance pupil diameter EPD of the optical imaging lens, the curvature radius R1 of the object-side surface of the first lens and the curvature radius R2 of the image-side surface of the first lens, the following relation is satisfied: 0.10 < EPD / (R1+R2) ≤ 0.15; between the inner diameter d0s of the object-side surface of the first lens barrel, the central thickness CT1 of the first lens on the Y optical axis and the refractive index N1 of the first lens, the following relation is satisfied: 3.25 < d0s / (CT1×N1) < 4.95; between the maximum axial thickness CP3 of the third spacer element and the inner diameter d3s of the object-side surface of the third spacer element, the following relation is satisfied: 0.00 < CP3 / d3s < 0.30; between the inner diameter d4s of the object-side surface of the fourth spacer element and the curvature radius R9 of the object-side surface of the fifth lens, the following relation is satisfied: -1.55 ≤ d4s / R9 < 0.40; between the air gap T34 between the third lens and the fourth lens on the X optical axis and the spacing distance Tr3r10 from the object-side surface of the second lens to the image-side surface of the fifth lens on the X optical axis, the following relation is satisfied: 0.10 < T34 / Tr3r10 ≤ 0.

25.

2. The optical imaging lens according to claim 1, characterized in that, Between the inner diameter d0bs of the object-side surface of the second lens barrel and the combined focal length f2345 of the second lens, the third lens, the fourth lens and the fifth lens, the following relation is satisfied: 0.10 < d0bs / f2345 < 0.

40.

3. The optical imaging lens according to claim 1, characterized in that, Between the spacing distance G0 from the object-side surface of the first lens barrel to the incident surface of the prism on the Y optical axis and the spacing distance G0b from the exit surface of the prism to the object-side surface of the second lens barrel on the X optical axis, the following relation is satisfied: 0.80 < G0 / G0b < 1.

75.

4. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further comprises a prism base, the prism is arranged on the prism base, the reflecting surface of the prism is in contact with the prism base, and the image-side surface of the first lens barrel is in contact with the prism base, Between the length Dl of the side surface of the prism base away from the first lens along the X optical axis direction, the length Dw of the side surface of the prism base facing the first lens along the X optical axis direction and the height Dh of the prism base along the Y optical axis direction, the following relation is satisfied: 79.85 < (Dl+Dw)×Dh < 94.

60.

5. The optical imaging lens according to claim 1, characterized in that, Between the air gap T23 between the second lens and the third lens on the X optical axis, the curvature radius R4 of the image-side surface of the second lens and the curvature radius R5 of the object-side surface of the third lens, the following relation is satisfied: -0.10 < T23×10 / (R4+R5) < 0.25; between the spacing distance EP0b2 from the object-side surface of the second lens barrel to the object-side surface of the second spacer element, the central thickness CT2 of the second lens on the X optical axis and the central thickness CT3 of the third lens on the X optical axis, the following relation is satisfied: 0.55 ≤ EP0b2 / (CT2+CT3) < 0.

70.

6. The optical imaging lens according to claim 1, characterized in that, Between the inner diameter d2s of the object-side surface of the second spacer element and the inner diameter d3s of the object-side surface of the third spacer element, the following relation is satisfied: 1.65 < (d2s+d3s) / d2s < 2.

10.

7. The optical imaging lens according to claim 1, characterized in that, The 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-ray axis, and the axial displacement SAG31 between the intersection of the object-side surface of the third lens and the X-ray axis and the vertex of the non-effective radius of the object-side surface of the third lens, satisfy: 0.85 <EP23 / SAG31<1.30。 8. The optical imaging lens according to claim 1, characterized in that, The outer diameter D3m of the image side of the third spacer element, the outer diameter D4s of the object side of the fourth spacer element, and the distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element on the X-ray axis satisfy the following condition: 11.80 < (D3m + D4s) / EP34 < 17.

40.

9. The optical imaging lens according to claim 1, characterized in that, The maximum axial thickness CP2 of the second spacer element, the center thickness CT2 of the second lens on the X-ray axis, and the center thickness CT3 of the third lens on the X-ray axis satisfy the following condition: 0.00 <CP2 / (CT2+CT3)<0.55。 10. The optical imaging lens according to claim 1, characterized in that, The combined focal length f23 of the second lens and the third lens, and the inner diameter d2s of the object-side surface of the second spacer element and the inner diameter d3s of the object-side surface of the third spacer element satisfy the following relationship: 0.95 <f23 / (d2s+d3s)<7.90。 11. The optical imaging lens according to any one of claims 1 to 10, characterized in that, The maximum height Lb of the second lens barrel on the X-ray axis, the effective radius DT21 of the object-side surface of the second lens, and the effective radius DT51 of the object-side surface of the fifth lens satisfy the following relationship: 1.30 <Lb / (DT21+DT51)<1.75。 12. The optical imaging lens according to any one of claims 1 to 10, characterized in that, The effective radius DT21 of the object side of the second lens, the effective radius DT52 of the image side of the fifth lens, the inner diameter d0bm of the image side of the second lens barrel and the inner diameter d0bs of the object side of the second lens barrel satisfy the following: -0.05<(DT52-DT21) / (d0bm-d0bs)<0.40.

Images