Optical imaging lens

Abstract

The present invention provides an optical imaging lens. The optical imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; satisfying: 5.30 < TD / T34×n3 ≤ 5.95; satisfying: -5.05 ≤ f3 / d3s < -4.55; satisfying: 1.30 ≤ CP3b / (d3cm - d3m) < 1.80. The present invention solves the problem that in the prior art, a five-piece optical imaging lens has a large gap in the middle lens due to meeting the lens processing feasibility and assembly stability, thereby generating stray light.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and more particularly, to an optical imaging lens. Background Art

[0002] In the field of optical imaging, with the continuous miniaturization of electronic devices, major manufacturers have increasingly higher requirements for the imaging performance of optical imaging lenses applied therein. Five-piece optical imaging lenses are widely used in various fields due to their compact structure, high cost-effectiveness, and ability to achieve good optical performance. For example, in the camera systems of mobile devices such as mobile phones and tablet computers, the demand for five-piece optical imaging lenses is gradually increasing. Currently, optical imaging lenses need to be realized in a very small space to ensure the thin and light design of portable electronic devices.

[0003] Currently, in order to meet the requirements of lens processing feasibility and assembly stability for five-piece optical imaging lenses applied in portable electronic device imaging, it is usually necessary to control the lens thickness and the spacing between the middle lenses. However, in this case, it is easy to make the air gap between the middle lenses larger, resulting in reflection, scattering, or diffraction of light at the edge part of the middle lenses, generating stray light. The problem of stray light seriously affects the final imaging clarity and imaging quality of the optical imaging lens.

[0004] That is to say, the five-piece optical imaging lens in the prior art has the problem that to meet the lens processing feasibility and assembly stability, the gap between the middle lenses is large, and further stray light is generated. Summary of the Invention

[0005] The main object of the present invention is to provide an optical imaging lens to solve the problem that the five-piece optical imaging lens in the prior art has a large gap between the middle lenses to meet the lens processing feasibility and assembly stability, and further generates stray light.

[0006] In order to achieve the above object, according to one aspect of the present invention, an optical imaging lens is provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the first lens has a positive optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is convex; the second lens has a negative optical power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the third lens has a negative optical power, the object side surface of the third lens is concave; the fourth lens has a positive optical power; the fifth lens has a negative optical power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave; the spacer element group includes a third spacer element, a third spacer first auxiliary element, and a third spacer second auxiliary element disposed between the third lens and the fourth lens, and also includes a fourth spacer element and a fourth spacer first auxiliary element disposed between the fourth lens and the fifth lens; the object side surface of the third spacer element is in partial contact with the image side surface of the third lens, the object side surface of the third spacer first auxiliary element is in partial contact with the image side surface of the third spacer element, and the object side surface of the third spacer second auxiliary element is in partial contact with the image side surface of the third spacer first auxiliary element; the object side surface of the fourth spacer element is in partial contact with the image side surface of the fourth lens, and the object side surface of the fourth spacer first auxiliary element is in partial contact with the image side surface of the fourth spacer element; wherein, the distance TD on the optical axis of the optical imaging lens from the object side surface of the first lens to the image side surface of the fifth lens, the air gap T34 on the optical axis between the third lens and the fourth lens, and the refractive index n3 of the third lens satisfy: 5.30 < TD / T34 × n3 ≤ 5.95; the effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacer element satisfy: -5.05 ≤ f3 / d3s < -4.55; the maximum axial thickness CP3b of the third spacer first auxiliary element, the inner diameter d3cm of the image side surface of the third spacer second auxiliary element, and the inner diameter d3m of the image side surface of the third spacer element satisfy: 1.30 ≤ CP3b / (d3cm - d3m) < 1.80.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the first lens has a positive optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is convex; the second lens has a negative optical power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the third lens has a negative optical power, the object side surface of the third lens is concave; the fourth lens has a positive optical power; the fifth lens has a negative optical power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave; the spacer element group includes a third spacer element, a third spacer first auxiliary element, and a third spacer second auxiliary element disposed between the third lens and the fourth lens, and further includes a fourth spacer element and a fourth spacer first auxiliary element disposed between the fourth lens and the fifth lens; the object side surface of the third spacer element is in partial contact with the image side surface of the third lens, the object side surface of the third spacer first auxiliary element is in partial contact with the image side surface of the third spacer element, and the object side surface of the third spacer second auxiliary element is in partial contact with the image side surface of the third spacer first auxiliary element; the object side surface of the fourth spacer element is in partial contact with the image side surface of the fourth lens, and the object side surface of the fourth spacer first auxiliary element is in partial contact with the image side surface of the fourth spacer element; wherein, the distance TD on the optical axis of the optical imaging lens from the object side surface of the first lens to the image side surface of the fifth lens, the air gap T34 on the optical axis between the third lens and the fourth lens, and the refractive index n3 of the third lens satisfy: 5.30 < TD / T34 × n3 ≤ 5.95; the effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacer element satisfy: -5.05 ≤ f3 / d3s < -4.55; the axial distance L from the object side end face of the lens barrel to the image side end face of the lens barrel and the sum SP3t4 of the maximum axial thicknesses of all spacer elements between the third lens and the fourth lens satisfy: 5.25 ≤ L / SP3t4 ≤ 6.36.

[0008] Further, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, and the sum SP2t3 of the maximum axial thicknesses of all spacer elements between the second lens and the third lens satisfy: -12.50 < (R4 + R5) / SP2t3 < -5.73.

[0009] Further, the radius of curvature R1 of the object side surface of the first lens, the outer diameter D0s of the object side end face of the lens barrel, and the inner diameter d0s of the object side end face of the lens barrel satisfy: 1.23 ≤ R1 / (D0s - d0s) < 2.50.

[0010] Furthermore, the spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side portion of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image-side portion of the second lens. The following relationship is satisfied between the radius of curvature R3 of the object-side surface of the second lens and the axial distance EP12 from the image-side surface of the first spacer element to the object-side surface of the second spacer element: 8.90 < R3 / EP12 ≤ 10.86.

[0011] Furthermore, the spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side portion of the first lens. The following relationship is satisfied between the axial distance EP01 from the object-side end surface of the lens barrel to the object-side surface of the first spacer element, the central thickness CT1 of the first lens on the optical axis, and the Abbe number V1 of the first lens: 51.09 ≤ EP01 / CT1 × V1 ≤ 62.15.

[0012] Furthermore, the spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side portion of the second lens. The following relationship is satisfied between the outer diameter D2s of the object-side surface of the second spacer element and the sum SP2t3 of the maximum axial thicknesses of all spacer elements between the second lens and the third lens: 10.85 ≤ D2s / SP2t3 < 13.30.

[0013] Furthermore, the spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side portion of the first lens. The following relationship is satisfied between the inner diameter d1s of the object-side surface of the first spacer element and the air space T12 on the optical axis from the first lens to the second lens: 26.80 < d1s / T12 ≤ 32.38.

[0014] Furthermore, the spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side portion of the second lens. The following relationship is satisfied between the combined focal length f12 of the first lens and the second lens and the axial distance EP02 from the object-side end surface of the lens barrel to the object-side surface of the second spacer element: 2.35 < f12 / EP02 < 3.26.

[0015] Furthermore, the spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side portion of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image-side portion of the second lens. The following relationship is satisfied between the axial distance EP12 from the image-side surface of the first spacer element to the object-side surface of the second spacer element and the central thickness CT2 of the second lens on the optical axis: 2.20 < EP12 / CT2 ≤ 2.67.

[0016] Further, the spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with a part of the image side surface of the second lens. The axial distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element satisfies: 1.75 < EP23 / CT3 < 5.05 with respect to the central thickness CT3 of the third lens on the optical axis.

[0017] Further, the axial distance L from the object side end face of the lens barrel to the image side end face of the lens barrel satisfies: 5.25 ≤ L / SP3t4 ≤ 6.36 with respect to the sum SP3t4 of the maximum axial thicknesses of all spacer elements between the third lens and the fourth lens.

[0018] Further, the spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with a part of the image side surface of the second lens. The axial distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element satisfies: 1.85 ≤ EP34 / EP23 < 4.75 with respect to the axial distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element.

[0019] Further, the maximum axial thickness CP4b of the fourth spacer first auxiliary element satisfies: 2.20 < CP4b / T45 < 2.70 with respect to the air gap T45 between the fourth lens and the fifth lens on the optical axis.

[0020] Further, the inner diameter d4s of the object side surface of the fourth spacer element satisfies: 4.85 ≤ d4s / CP4b < 5.90 with respect to the maximum axial thickness CP4b of the fourth spacer first auxiliary element.

[0021] Further, the effective focal length f of the optical imaging lens, the outer diameter D0m of the image side end face of the lens barrel, and the outer diameter D0s of the object side end face of the lens barrel satisfy: 4.15 ≤ f / (D0m - D0s) < 10.35.

[0022] Further, the inner diameter d4m of the image side surface of the fourth spacer element, the curvature radius R9 of the object side surface of the fifth lens, and the curvature radius R10 of the image side surface of the fifth lens satisfy: 2.80 < d4m / (R9 - R10) < 4.80.

[0023] Applying the technical solution of the present invention, the optical imaging lens of the present application is composed of a lens barrel and five lenses and spacer elements arranged in the lens barrel. By reasonably arranging the optical power and surface shape of the five lenses and the position of the spacer element, and setting the optical imaging lens to satisfy 5.30 < TD / T34×n3 ≤ 5.95, while restricting the overall size of the optical imaging lens, maintaining good lens molding and stable assembly, the axial distance between the third lens and the fourth lens in the middle of the optical imaging lens will be relatively large, which affects the reflection, scattering or diffraction of light between the third lens and the fourth lens, resulting in a large amount of reflection and scattering of light at the edge part of the third lens or the fourth lens, generating new stray light and affecting the imaging clarity and imaging quality of the optical imaging lens. Therefore, by restricting -5.05 ≤ f3 / d3s < -4.55 and 1.30 ≤ CP3b / (d3cm - d3m) < 1.80, the present application can ensure that the size of the third spacer element matches the effective focal length of the third lens, prevent light from passing through the edge part of the third lens, thereby avoiding the generation of stray light, effectively reducing the reflection, scattering and diffraction of light at the edge part of the third spacer element or the fourth lens, improving the stray light problem generated between the third lens and the fourth lens, and further improving the imaging quality of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 Shows the dimension marking diagram of the optical imaging lens of an optional embodiment of the present invention;

[0026] Figure 2 Shows the schematic structural diagram of the optical imaging lens of Embodiment 1-1 of the present invention;

[0027] Figure 3 Shows the schematic structural diagram of the optical imaging lens of Embodiment 1-2 of the present invention;

[0028] Figure 4 Shows the schematic structural diagram of the optical imaging lens of Embodiment 1-3 of the present invention;

[0029] Figures 5 to 8 Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens of Embodiment 1 of the present invention;

[0030] Figure 9 Shows the schematic structural diagram of the optical imaging lens of Embodiment 2-1 of the present invention;

[0031] Figure 10Shows a schematic structural diagram of the optical imaging lens according to Embodiment 2-2 of the present invention;

[0032] Figure 11 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 2-3 of the present invention;

[0033] Figures 12 to 15 Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 2 of the present invention;

[0034] Figure 16 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 3-1 of the present invention;

[0035] Figure 17 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 3-2 of the present invention;

[0036] Figure 18 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 3-3 of the present invention;

[0037] Figures 19 to 22 Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 3 of the present invention;

[0038] Figure 23 Shows the stray light energy diagram of the optical imaging lens of Application Solution 1 of the present application when 5.30 < TD / T34 × n3 ≤ 5.95, f3 / d3s = -4.89 and CP3b / (d3cm - d3m) = 1.48;

[0039] Figure 24 Shows the stray light energy diagram of the optical imaging lens of Application Solution 2 of the present application when 5.30 < TD / T34 × n3 ≤ 5.95, f3 / d3s = -4.56 and CP3b / (d3cm - d3m) = 1.76;

[0040] Figure 25 Shows the stray light energy diagram of the optical imaging lens of Example 1 when 5.30 < TD / T34 × n3 ≤ 5.95, f3 / d3s = -6.03 and CP3b / (d3cm - d3m) = 1.09;

[0041] Figure 26 Shows the stray light energy diagram of the optical imaging lens of Example 2 when 5.30 < TD / T34 × n3 ≤ 5.95, f3 / d3s = -3.65 and CP3b / (d3cm - d3m) = 2.13.

[0042] Among them, the above-mentioned drawings include the following reference numerals:

[0043] P0, lens barrel; E1, first lens; P1, first spacer element; P1b, first auxiliary spacer element of the first spacer; E2, second lens; P2, second spacer element; P2b, first auxiliary spacer element of the second spacer; E3, third lens; P3, third spacer element; P3b, first auxiliary spacer element of the third spacer; P3c, second auxiliary spacer element of the third spacer; P3d, third auxiliary spacer element of the third spacer; P3e, fourth auxiliary spacer element of the third spacer; E4, fourth lens; P4, fourth spacer element; P4b, first auxiliary spacer element of the fourth spacer; P4c, second auxiliary spacer element of the fourth spacer; E5, fifth lens; S1, object side surface of the first lens; S2, image side surface of the first lens; S3, object side surface of the second lens; S4, image side surface of the second lens; S5, object side surface of the third lens; S6, image side surface of the third lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens; S9, object side surface of the fifth lens; S10, image side surface of the fifth lens. Detailed implementation mode

[0044] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0045] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0046] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in reference to the direction shown in the drawings, or in reference to the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation terms do not limit the present invention.

[0047] It should be noted that in this specification, the expressions of the first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0048] In the drawings, for the convenience of explanation, the thickness, size and shape of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0049] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface is not defined, 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 based on the judgment method of those with ordinary knowledge in the field, and the positive or negative of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database (lens data) in optical software) is used to judge the convexity and concavity. Taking the object side as an example, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; taking the image side as an example, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In this application, the left side is the object side and the right side is the image side.

[0050] In order to solve the problem that the five-piece optical imaging lens in the prior art has a large gap in the middle lens due to meeting the lens processing feasibility and assembly stability, thereby generating stray light, the present invention provides an optical imaging lens.

[0051] Such as Figures 1 to 26As shown, in an optional embodiment of the present application, the optical imaging lens includes a lens barrel, a lens group, and a spacer element group disposed in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens. The first lens has a positive optical power. The object side surface of the first lens is convex, and the image side surface of the first lens is convex. The second lens has a negative optical power. The object side surface of the second lens is convex, and the image side surface of the second lens is concave. The third lens has a negative optical power. The object side surface of the third lens is concave. The fourth lens has a positive optical power. The fifth lens has a negative optical power. The object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave. The spacer element group includes a third spacer element, a third spacer first auxiliary element, and a third spacer second auxiliary element disposed between the third lens and the fourth lens, and further includes a fourth spacer element and a fourth spacer first auxiliary element disposed between the fourth lens and the fifth lens. The object side surface of the third spacer element is in partial contact with the image side surface of the third lens. The object side surface of the third spacer first auxiliary element is in partial contact with the image side surface of the third spacer element. The object side surface of the third spacer second auxiliary element is in partial contact with the image side surface of the third spacer first auxiliary element. The object side surface of the fourth spacer element is in partial contact with the image side surface of the fourth lens. The object side surface of the fourth spacer first auxiliary element is in partial contact with the image side surface of the fourth spacer element. Among them, the distance TD on the optical axis of the optical imaging lens from the object side surface of the first lens to the image side surface of the fifth lens, the air gap T34 on the optical axis between the third lens and the fourth lens, and the refractive index n3 of the third lens satisfy: 5.30 < TD / T34 × n3 ≤ 5.95. The effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacer element satisfy: -5.05 ≤ f3 / d3s < -4.55. The maximum axial thickness CP3b of the third spacer first auxiliary element, the inner diameter d3cm of the image side surface of the third spacer second auxiliary element, and the inner diameter d3m of the image side surface of the third spacer element satisfy: 1.30 ≤ CP3b / (d3cm - d3m) < 1.80.

[0052] The optical imaging lens of the present application is composed of a lens barrel and five lenses and spacer elements arranged in the lens barrel. By reasonably arranging the optical powers and surface shapes of the five lenses and the positions of the spacer elements, and setting the optical imaging lens to satisfy 5.30 < TD / T34×n3 ≤ 5.95, while restricting the overall size of the optical imaging lens, maintaining good lens molding and stable assembly, the axial distance between the third lens and the fourth lens in the middle of the optical imaging lens will be relatively large, which affects the reflection, scattering or diffraction of light between the third lens and the fourth lens, resulting in a large amount of reflection and scattering of light at the edge of the third lens or the fourth lens, generating new stray light and affecting the imaging clarity and imaging quality of the optical imaging lens. Therefore, by restricting -5.05 ≤ f3 / d3s < -4.55 and 1.30 ≤ CP3b / (d3cm - d3m) < 1.80, the present application can ensure that the size of the third spacer element matches the effective focal length of the third lens, prevent light from passing through the edge of the third lens, thereby avoiding the generation of stray light, effectively reducing the reflection, scattering and diffraction of light at the edge of the third spacer element or the fourth lens, improving the problem of stray light generated between the third lens and the fourth lens, and further improving the imaging quality of the optical imaging lens.

[0053] In addition, referring to Table 1 below, Figures 23 to 26 as shown, on the premise that the optical imaging lens satisfies 5.30 < TD / T34×n3 ≤ 5.95, for example, TD / T34×n3 = 5.66 or TD / T34×n3 = 5.95, Figure 23 shows the stray light energy diagram of the optical imaging lens of Solution 1 of the present application when f3 / d3s = -4.89 and CP3b / (d3cm - d3m) = 1.48, Figure 24 shows the stray light energy diagram of the optical imaging lens of Solution 2 of the present application when f3 / d3s = -4.56 and CP3b / (d3cm - d3m) = 1.76, Figure 25 shows the stray light energy diagram of the optical imaging lens of Example 1 when f3 / d3s = -6.03 and CP3b / (d3cm - d3m) = 1.09, Figure 26 shows the stray light energy diagram of the optical imaging lens of Example 2 when f3 / d3s = -3.65 and CP3b / (d3cm - d3m) = 2.13.

[0054] From Figures 23 to 26It can be known that when the optical imaging lens satisfies f3 / d3s = -4.89, CP3b / (d3cm - d3m) = 1.48 or f3 / d3s = -4.56, CP3b / (d3cm - d3m) = 1.76, the optical path of the optical imaging lens is normal and stable, no new stray light is generated at the spacer element, and the performance is better. When the optical imaging lens satisfies f3 / d3s = -6.03, CP3b / (d3cm - d3m) = 1.09, light is reflected at the edge structure part of the third lens, and part of the light leaks at the edge part of the spacer element to become stray light, interfering with the final imaging, and the performance is poor. When the optical imaging lens satisfies f3 / d3s = -3.65, CP3b / (d3cm - d3m) = 2.13, the spacer element on the image side of the third lens is relatively thick, which easily reflects and scatters light, generating arc-shaped stray light inside the optical imaging lens, resulting in an increase in stray light and a poor performance. Thus, it can be seen that when 5.30 < TD / T34×n3 ≤ 5.95 and -5.05 ≤ f3 / d3s < -4.55 and 1.30 ≤ CP3b / (d3cm - d3m) < 1.80 are satisfied, the size of the third spacer element can be ensured to match the effective focal length of the third lens, preventing light from passing through the edge part of the third lens, thereby avoiding the generation of stray light, effectively reducing the reflection, scattering, and diffraction of light at the edge part of the third spacer element or the fourth lens, improving the stray light problem generated between the third lens and the fourth lens, and further improving the imaging quality of the optical imaging lens.

[0055] Table 1

[0056]

[0057] In this embodiment, the spacer element group further includes a first spacer element disposed between the first lens and the second lens and in partial contact with the image side surface of the first lens, and a second spacer element disposed between the second lens and the third lens and in partial contact with the image side surface of the second lens.

[0058] In this embodiment, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, and the sum SP2t3 of the maximum axial thicknesses of all the spacer elements between the second lens and the third lens satisfy: -12.50 < (R4 + R5) / SP2t3 < -5.73. Since the axial distance between the second lens and the third lens is relatively large, for assembly stability, through this conditional expression, the radius of curvature of the image side surface of the second lens and the radius of curvature of the object side surface of the third lens can be restricted, and at the same time, the sum of the maximum axial thicknesses of all the spacer elements between the second lens and the third lens can be controlled, restricting the concave shape change trend of the image side surface of the second lens and the object side surface of the third lens. On the premise of ensuring assembly stability, the refraction trend of light between the second lens and the third lens can be further controlled, which is beneficial to reducing light scattering.

[0059] It should be noted that the above-mentioned SP2t3 is the maximum axial thickness CP2 of the second spacer element, and can also be the sum of the maximum axial thickness CP2 of the second spacer element and the maximum axial thickness CP2b of the second auxiliary spacer element.

[0060] In this embodiment, the radius of curvature R1 of the object side surface of the first lens, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel satisfy: 1.23 ≤ R1 / (D0s - d0s) < 2.50. Through this conditional expression, it is beneficial to meet the control requirements of the optical imaging lens for the appearance, ensure that the front end size and the module window size of the optical imaging lens are appropriate, ensure that sufficient light enters the optical imaging lens, which is beneficial to ensuring the light input amount and further beneficial to improving the imaging brightness.

[0061] In this embodiment, the radius of curvature R3 of the object side surface of the second lens and the axial distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element satisfy: 8.90 < R3 / EP12 ≤ 10.86. Through this conditional expression, the edge thickness of the second lens can be controlled, avoiding the situation that the edge of the second lens is too thick, resulting in an increase in the internal reflection optical path in the lens and thus an increase in stray light, which is not conducive to improving the imaging quality. At the same time, the refractive index of the second lens is set relatively high and the surface shape is relatively sensitive. Restricting the above formula can also improve the processing feasibility of the second lens, ensure good formability of the second lens, effectively ensure the surface shape stability of the second lens, and improve the performance of the optical imaging lens.

[0062] In this embodiment, the axial distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element, the central thickness CT1 of the first lens on the optical axis, and the Abbe number V1 of the first lens satisfy: 51.09 ≤ EP01 / CT1 × V1 ≤ 62.15. Through this conditional formula, it can be ensured that the front-end thickness of the lens barrel and the thickness of the first lens are appropriate, avoiding the risk of deformation of the front end of the lens barrel and the first lens during the assembly process, thereby ensuring the imaging performance of the optical imaging lens. At the same time, it can also effectively converge the incident light into the interior of the optical imaging lens, improving the imaging quality of the optical imaging lens.

[0063] In this embodiment, the outer diameter D2s of the object-side surface of the second spacer element and the sum SP2t3 of the maximum axial thicknesses of all spacer elements between the second lens and the third lens satisfy: 10.85 ≤ D2s / SP2t3 < 13.30. Since the axial distance between the second lens and the third lens is relatively large, through this conditional formula, it is ensured that the change amount of the axial distance when the second lens and the third lens are affected by external forces after assembly is small, and the impact on the imaging performance of the entire optical imaging lens will also be small, and the relative stability of the second lens and the third lens can be maintained. At the same time, by reasonably arranging the thicknesses of the spacer elements, the assembly stability of the optical imaging lens can be effectively ensured.

[0064] In this embodiment, the inner diameter d1s of the object-side surface of the first spacer element and the air gap T12 on the optical axis from the first lens to the second lens satisfy: 26.80 < d1s / T12 ≤ 32.38. Through this conditional formula, the relationship between the inner diameter of the object-side surface of the first spacer element and the air gap on the optical axis from the first lens to the second lens can be reasonably controlled, ensuring that the light from the first lens is converging when it enters the second lens. At the same time, due to the appropriate air gap on the optical axis from the first lens to the second lens, it is beneficial to improve the assembly stability of the first lens and the second lens. Controlling the inner diameter of the object-side surface of the first spacer element can also effectively block the stray light from the front end, improving the imaging quality of the optical imaging lens.

[0065] In this embodiment, the combined focal length f12 of the first lens and the second lens and the axial distance EP02 from the object-side end face of the lens barrel to the object-side surface of the second spacer element satisfy: 2.35 < f12 / EP02 < 3.26. Through this conditional formula, it can be ensured that the thicknesses of the first lens and the second lens are appropriate, optimizing the lens shape on the basis of meeting the lens strength, effectively preventing the front-end lens from deforming. At the same time, by controlling the combined focal length of the first lens and the second lens, the deflection angle of the edge field of view at the front end of the optical imaging lens can be controlled, effectively reducing the sensitivity of the optical imaging lens.

[0066] In this embodiment, the axial distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element and the central thickness CT2 of the second lens on the optical axis satisfy: 2.20 < EP12 / CT2 ≤ 2.67. Through this conditional expression, the ratio of the axial distance from the image side surface of the first spacer element to the object side surface of the second spacer element to the central thickness of the second lens on the optical axis can be controlled within a reasonable range, ensuring the thickness uniformity of the second lens, which is beneficial to improving the surface form stability of the second lens during actual processing and further enhancing the assembly yield of the optical imaging lens.

[0067] In this embodiment, the axial distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element and the central thickness CT3 of the third lens on the optical axis satisfy: 1.75 < EP23 / CT3 < 5.05. Through this conditional expression, the thickness uniformity of the third lens is ensured, meeting the processing requirements of the optical imaging lens for the third lens and also ensuring the surface form stability of the third lens during actual processing.

[0068] In this embodiment, the axial distance L from the object side end surface of the lens barrel to the image side end surface of the lens barrel and the sum SP3t4 of the maximum axial thicknesses of all spacer elements between the third lens and the fourth lens satisfy: 5.25 ≤ L / SP3t4 ≤ 6.36. Since the air gap between the third lens and the fourth lens is relatively large, through this conditional expression, the sum of the thicknesses of all spacer elements between the third lens and the fourth lens can be controlled. At the same time, the spacer elements with different thicknesses are reasonably arranged, and the spacer elements between the third lens and the fourth lens are arranged in the way that the spacer rings are adjacent to the spacer sheets to ensure the assembly stability. Among them, the relatively thin spacer sheets can also intercept the excess stray light from the front end to ensure the imaging quality.

[0069] It should be noted that SP3t4 is the sum of the maximum axial thickness CP3 of the third spacer element, the maximum axial thickness CP3b of the first auxiliary element of the third spacer, and the maximum axial thickness CP3c of the second auxiliary element of the third spacer. It can also be the sum of the maximum axial thickness CP3 of the third spacer element, the maximum axial thickness CP3b of the first auxiliary element of the third spacer, the maximum axial thickness CP3c of the second auxiliary element of the third spacer, and the maximum axial thickness CP3d of the third auxiliary element of the third spacer. It can also be the sum of the maximum axial thickness CP3 of the third spacer element, the maximum axial thickness CP3b of the first auxiliary element of the third spacer, the maximum axial thickness CP3c of the second auxiliary element of the third spacer, the maximum axial thickness CP3d of the third auxiliary element of the third spacer, and the maximum axial thickness CP3e of the fourth auxiliary element of the third spacer.

[0070] In this embodiment, the axial distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element and the axial distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element satisfy: 1.85 ≤ EP34 / EP23 < 4.75. Through this conditional expression, the thickness uniformity of the edge portions of the third lens and the fourth lens can be effectively controlled, thereby ensuring uniform stress on the third lens and the fourth lens during the assembly process, preventing lens displacement or deformation caused by uneven stress during assembly or use, and making the surface shape change of the assembled lens smaller.

[0071] In this embodiment, the maximum axial thickness CP4b of the fourth spacer first auxiliary element and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 2.20 < CP4b / T45 < 2.70. Through this conditional expression, by arranging the spacer element between the fourth lens and the fifth lens in a manner of a spacer adjacent to a spacer ring, the thickness of the fourth spacer first auxiliary element can be effectively adjusted to ensure a uniform air gap between the fourth lens and the fifth lens, and the field curvature can be optimized by adjusting the spacer while ensuring the assembly stability.

[0072] In this embodiment, the inner diameter d4s of the object side surface of the fourth spacer element and the maximum axial thickness CP4b of the fourth spacer first auxiliary element satisfy: 4.85 ≤ d4s / CP4b < 5.90. Through this conditional expression, by arranging the spacer element between the fourth lens and the fifth lens in a manner of a spacer adjacent to a spacer ring, stray light can be absorbed by the inner ring inclined surface of the spacer ring to prevent the stray light from passing through the fifth lens and entering the imaging surface, which is beneficial to improving the stray light and enhancing the imaging clarity and contrast of the optical imaging lens.

[0073] In this embodiment, the effective focal length f of the optical imaging lens, the outer diameter D0m of the image side end surface of the lens barrel, and the outer diameter D0s of the object side end surface of the lens barrel satisfy: 4.15 ≤ f / (D0m - D0s) < 10.35. Through this conditional expression, the relationship between the difference in the outer diameters of the front and rear ends of the lens barrel and the effective focal length of the optical imaging lens is controlled. On the basis of meeting the appearance control requirements, it is ensured that the optical imaging lens meets the long focal length performance, and the size of the lens barrel can be effectively controlled to be relatively uniform, meeting the overall trend of lightness, thinness, and miniaturization of the optical imaging lens.

[0074] In this embodiment, the inner diameter d4m of the image side surface of the fourth spacer element, the curvature radius R9 of the object side surface of the fifth lens, and the curvature radius R10 of the image side surface of the fifth lens satisfy: 2.80 < d4m / (R9 - R10) < 4.80. Since the angle of the light rays emitted from the fourth lens is relatively steep, through this conditional expression, the fourth spacer element can effectively intercept the excess light rays from entering the fifth lens, reducing the stray light and further reducing the stray light on the basis of ensuring the optical illuminance.

[0075] Optionally, the optical imaging lens in the embodiments of the present application can be simulated using software and / or tools such as ZEMAX and CODEV. During the simulation using such software and / or tools, the surface profile of each lens can be appropriately adjusted based on the surface profiles inherent in the software and / or tools used.

[0076] In addition, in another optional embodiment of the present application, an optical imaging lens is also provided, including a lens barrel and a lens group and a spacer element group arranged in the lens barrel, the lens group consisting of five lenses, and the five lenses are, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens; the first lens has positive focal power, the object side surface of the first lens is convex, and the image side surface of the first lens is convex; the second lens has negative focal power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the third lens has negative focal power, and the object side surface of the third lens is concave; the fourth lens has positive focal power; the fifth lens has negative focal power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave; the spacer element group includes a third spacer element, a third spacer first auxiliary element and a third spacer second auxiliary element placed between the third lens and the fourth lens, and also includes a fourth spacer element and a fourth spacer first auxiliary element placed between the fourth lens and the fifth lens; the object side surface of the third spacer element and the image side surface of the third lens The object side surface of the fourth lens element is partially in contact with the image side surface of the fourth lens element, and the object side surface of the fourth lens element is partially in contact with the image side surface of the fourth lens element. The object side surface of the fourth lens element is partially in contact with the image side surface of the fourth lens element, and the object side surface of the fourth lens element is partially in contact with the image side surface of the fourth lens element. In particular, the distance TD on the optical axis of the optical imaging lens from the object side surface of the first lens element to the image side surface of the fifth lens element, the air gap T34 on the optical axis between the third lens element and the fourth lens element, and the refractive index n3 of the third lens satisfy the following conditions: 5.30 < TD / T34 × n3 ≤ 5.95; the effective focal length f3 of the third lens element and the inner diameter d3s of the object side surface of the third lens element satisfy the following conditions: -5.05 ≤ f3 / d3s < -4.55; and the axial distance L from the object-side end surface of the lens barrel to the image-side end surface of the lens barrel and the maximum axial thickness sum SP3t4 of all the spacers between the third lens and the fourth lens element satisfy the following conditions: 5.25 ≤ L / SP3t4 ≤ 6.36.

[0077] The optical imaging lens of the present application is composed of a lens barrel and five lenses and spacer elements arranged in the lens barrel. By reasonably arranging the optical powers and surface shapes of the five lenses and the positions of the spacer elements, and setting the optical imaging lens to satisfy 5.30 < TD / T34×n3 ≤ 5.95, while restricting the overall size of the optical imaging lens, maintaining good lens forming and stable assembly, the axial distance between the third lens and the fourth lens in the middle of the optical imaging lens is relatively large, which affects the reflection, scattering or diffraction of light between the third lens and the fourth lens, resulting in a large amount of reflection and scattering of light at the edge part of the third lens or the fourth lens, generating new stray light and affecting the imaging clarity and imaging quality of the optical imaging lens. Therefore, by restricting -5.05 ≤ f3 / d3s < -4.55 and 5.25 ≤ L / SP3t4 ≤ 6.36, the present application can ensure that the size of the third spacer element matches the effective focal length of the third lens, prevent light from passing through the edge part of the third lens, thus avoiding the generation of stray light, effectively reducing the reflection, scattering and diffraction of light at the edge part of the third spacer element or the fourth lens, controlling the sum of the thicknesses of all spacer elements between the third lens and the fourth lens, and reasonably arranging spacer elements with different thicknesses. The spacer elements between the third lens and the fourth lens are arranged in a way that a spacer ring is adjacent to a spacer sheet to ensure assembly stability. Among them, the thinner spacer sheet can also intercept the excess stray light from the front end, which is beneficial to improving the imaging quality of the optical imaging lens.

[0078] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0079] Optionally, the above optical imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0080] In the optical imaging lens of the present application, multiple lenses can be used, such as the five lenses mentioned above. In the present application, at least one of the lens surfaces of each lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0081] However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although the five-lens case is described as an example in the embodiment, the optical imaging lens is not limited to including five lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0082] Figure 1 The figure shows a dimension marking schematic diagram of an optical imaging lens of the present application. Figure 1 Parameters such as EP01, EP12, EP23, EP34, d1s, D2s, d3s, d3m, d3cm, d4s, d4m, CP2, CP2b, CP3, CP3b, CP3c, CP3d, CP3e, CP4b, d0s, D0s, D0m, L, and EP02 are marked in the figure to clearly and intuitively understand the meaning of the parameters. For the convenience of describing the surface shape of the optical imaging lens and specific lenses, these parameters will no longer be shown in the accompanying drawings when specific embodiments are described later.

[0083] The following further describes specific examples of the surface shape and parameters of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings.

[0084] It should be noted that in the following Example 1, there are three examples: Example 1-1, Example 1-2, and Example 1-3; in Example 2, there are three examples: Example 2-1, Example 2-2, and Example 2-3; in Example 3, there are three examples: Example 3-1, Example 3-2, and Example 3-3. The curvature radii, central thicknesses, and other parameters of the first lens to the fifth lens of the optical imaging lens, as well as the spacing distances and high-order term coefficients between the lenses, are the same under the three examples in the same embodiment, but the parameters such as the lens barrel, the thicknesses, inner diameters, and outer diameters of each spacer element are different. Or rather, the main structures for imaging are the same, while the auxiliary structures for imaging are different.

[0085] It should be noted that any one of the following Examples 1 to 3 is applicable to all embodiments of the present application.

[0086] Example 1

[0087] As Figures 2 to 8 shown, the optical imaging lens of Example 1 is described. Figure 2 The figure shows a schematic structural diagram of the optical imaging lens of Example 1-1. Figure 3 The figure shows a schematic structural diagram of the optical imaging lens of Example 1-2. Figure 4 The figure shows a schematic structural diagram of the optical imaging lens of Example 1-3.

[0088] As Figures 2 to 4As shown in the figure, the optical imaging lens includes a lens barrel P0, and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a second spacer first auxiliary element P2b, a third lens E3, a third spacer P3, a third spacer first auxiliary element P3b, a third spacer second auxiliary element P3c, a fourth lens E4, a fourth spacer P4, a fourth spacer first auxiliary element P4b, and a fifth lens E5, which are sequentially arranged in the lens barrel P0 from the object side to the image side.

[0089] As Figure 2 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 1-1. In this example, the object side surface and the image side surface of the first spacer P1 are respectively in partial contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer P2 are respectively in partial contact with the image side surface S4 of the second lens and the object side surface of the second spacer first auxiliary element P2b. The image side surface of the second spacer first auxiliary element P2b is in partial contact with the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer P3 are respectively in partial contact with the image side surface S6 of the third lens and the object side surface of the third spacer first auxiliary element P3b. The image side surface of the third spacer first auxiliary element P3b is in partial contact with the object side surface of the third spacer second auxiliary element P3c, and the image side surface of the third spacer second auxiliary element P3c is in partial contact with the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer P4 are respectively in partial contact with the image side surface S8 of the fourth lens and the object side surface of the fourth spacer first auxiliary element P4b. The image side surface of the fourth spacer first auxiliary element P4b is in partial contact with the object side surface S9 of the fifth lens.

[0090] As Figure 3 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 1-2. The abutting and contacting manner of the spacer elements in this example is the same as that in Embodiment 1-1, and reference can be made to the relevant description in Embodiment 1-1, which will not be elaborated here.

[0091] As Figure 4 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 1-3. The difference from Embodiment 1-1 is that a third spacer third auxiliary element P3d and a third spacer fourth auxiliary element P3e are further provided on the image side of the third spacer second auxiliary element P3c. At this time, the image side surface of the third spacer second auxiliary element P3c is in partial contact with the object side surface of the third spacer third auxiliary element P3d, the image side surface of the third spacer third auxiliary element P3d is in partial contact with the object side surface of the third spacer fourth auxiliary element P3e, and the image side surface of the third spacer fourth auxiliary element P3e is in partial contact with the object side surface S8 of the fourth lens. The abutting and contacting manner of the remaining spacer elements in this example is the same as that in Embodiment 1-1, and reference can be made to the relevant description in Embodiment 1-1, which will not be elaborated here.

[0092] In summary, the structural parameters of the optical imaging lens in the first embodiment under Embodiment 1-1, Embodiment 1-2, and Embodiment 1-3 are shown in Table 2 below.

[0093] Table 2

[0094]

[0095] In the first embodiment, the object side S1 of the first lens is convex, and the image side S2 of the first lens is convex. The object side S3 of the second lens is convex, and the image side S4 of the second lens is concave. The object side S5 of the third lens is concave, and the image side S6 of the third lens is concave. The object side S7 of the fourth lens is convex, and the image side S8 of the fourth lens is concave. The object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is concave.

[0096] In the first embodiment, the effective focal length f1 of the first lens is 4.91 mm, the effective focal length f2 of the second lens is -8.83 mm, the effective focal length f3 of the third lens is -17.19 mm, the effective focal length f4 of the fourth lens is 40.56 mm, the effective focal length f5 of the fifth lens is -26.61 mm. The distance TD from the object side of the first lens to the image side of the fifth lens on the optical axis of the optical imaging lens is 8.42 mm. The image height ImgH corresponding to the maximum field of view angle of the optical imaging lens is 3.40 mm. Half of the maximum field of view angle of the optical imaging lens, HFOV, is 18.98°. The aperture number Fno of the optical imaging lens is 2.00. The effective focal length f of the optical imaging lens is 9.70 mm. The combined focal length f12 of the first lens and the second lens is 8.06 mm.

[0097] Table 3 shows the basic structural parameter table of the optical imaging lens in the first embodiment, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0098] Table 3

[0099]

[0100] In the first embodiment, the object side and the image side of the first lens E1 to the fifth lens E5 are all aspherical surfaces. The surface profiles of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0101] Formula (1).

[0102] Among them, when the aspheric surface is at a position with a height of h along the optical axis direction, x is the sagitta, which is the distance from the vertex of the aspheric surface; c is the paraxial curvature of the aspheric surface, and 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 aspheric surface. Table 4 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the surfaces S1 - S10 of each aspheric lens in Embodiment 1.

[0103] Table 4

[0104]

[0105] Figure 5 The axial chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of the focusing points of light rays with 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 values corresponding to different image heights. Figure 8 The lateral chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after the light rays pass through the optical imaging lens.

[0106] According to Figures 5 to 8 It can be known that the optical imaging lens given in Embodiment 1 can achieve good imaging quality.

[0107] Embodiment 2

[0108] As Figures 9 to 15 shown, the optical imaging lens of Embodiment 2 is described. Figure 9 The structural schematic diagram of the optical imaging lens of Embodiment 2 - 1 is shown, Figure 10 The structural schematic diagram of the optical imaging lens of Embodiment 2 - 2 is shown, Figure 11 The structural schematic diagram of the optical imaging lens of Embodiment 2 - 3 is shown.

[0109] As Figures 9 to 11 shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a third spacer first auxiliary element P3b, a third spacer second auxiliary element P3c, a fourth lens E4, a fourth spacer P4, a fourth spacer first auxiliary element P4b, and a fifth lens E5 that are sequentially arranged in the lens barrel P0 from the object side to the image side.

[0110] As Figure 9As shown in the figure, it is a schematic structural diagram of the optical imaging lens of Embodiment 2-1. In this example, a second spacer first auxiliary element P2b is further provided on the image side of the second spacer element P2. The object side surface and the image side surface of the first spacer element P1 are in partial contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer element P2 are in partial contact with the image side surface S4 of the second lens and the object side surface of the second spacer first auxiliary element P2b, respectively. The image side surface of the second spacer first auxiliary element P2b is in partial contact with the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer element P3 are in partial contact with the image side surface S6 of the third lens and the object side surface of the third spacer first auxiliary element P3b, respectively. The image side surface of the third spacer first auxiliary element P3b is in partial contact with the object side surface of the third spacer second auxiliary element P3c. The image side surface of the third spacer second auxiliary element P3c is in partial contact with the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer element P4 are in partial contact with the image side surface S8 of the fourth lens and the object side surface of the fourth spacer first auxiliary element P4b, respectively. The image side surface of the fourth spacer first auxiliary element P4b is in partial contact with the object side surface S9 of the fifth lens.

[0111] As Figure 10 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 2-2. The difference from Embodiment 2-1 is that a first spacer first auxiliary element P1b is further provided on the image side of the first spacer element P1 in this example. At this time, the image side surface of the first spacer element P1 is in partial contact with the object side surface of the first spacer first auxiliary element P1b, and the image side surface of the first spacer first auxiliary element P1b is in partial contact with the object side surface S3 of the second lens. The bearing and abutting manners of the remaining spacer elements in this example are the same as those in Embodiment 2-1, and reference can be made to the relevant descriptions in Embodiment 2-1, which will not be elaborated here.

[0112] As Figure 11 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 2-3. The difference from Embodiment 2-1 is that the second spacer first auxiliary element P2b is cancelled in this example. At this time, the object side surface and the image side surface of the second spacer element P2 are in partial contact with the image side surface S2 of the second lens and the object side surface S3 of the third lens, respectively. The bearing and abutting manners of the remaining spacer elements in this example are the same as those in Embodiment 2-1, and reference can be made to the relevant descriptions in Embodiment 2-1, which will not be elaborated here.

[0113] In summary, the structural parameters of the optical imaging lens in Embodiment 2 under Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3 are as shown in Table 5.

[0114] Table 5

[0115]

[0116] In the second embodiment, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is convex. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave. The object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex. The object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is convex.

[0117] In the second embodiment, the effective focal length f1 of the first lens is 4.92 mm, the effective focal length f2 of the second lens is -8.69 mm, the effective focal length f3 of the third lens is -17.50 mm, the effective focal length f4 of the fourth lens is 36.70 mm, the effective focal length f5 of the fifth lens is -25.87 mm. The distance TD from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis of the optical imaging lens is 7.34 mm. The image height ImgH corresponding to the maximum field of view angle of the optical imaging lens is 3.31 mm. Half of the maximum field of view angle HFOV of the optical imaging lens is 18.69°. The f-number Fno of the optical imaging lens is 2.00. The effective focal length f of the optical imaging lens is 9.70 mm. The combined focal length f12 of the first lens and the second lens is 8.11 mm.

[0118] Table 6 shows the basic structural parameter table of the optical imaging lens in the second embodiment, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0119] Table 6

[0120]

[0121] The following Table 7 gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface S1 - S10 in the second embodiment.

[0122] Table 7

[0123]

[0124] Figure 12 Shows the axial chromatic aberration curve of the optical imaging lens in the second embodiment, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the optical imaging lens. Figure 13 Shows the astigmatism curve of the optical imaging lens in the second embodiment, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14 Shows the distortion curve of the optical imaging lens in the second embodiment, which represents the distortion magnitude values corresponding to different image heights. Figure 15 Shows the lateral chromatic aberration curve of the optical imaging lens in the second embodiment, which represents the deviation of different image heights on the imaging plane after light rays pass through the optical imaging lens.

[0125] According to Figures 12 to 15 it can be seen that the optical imaging lens given in the second embodiment can achieve good imaging quality.

[0126] Embodiment Three

[0127] As Figures 16 to 22 shown, the optical imaging lens of Embodiment Three is described. Figure 16 Fig. shows the schematic structural diagram of the optical imaging lens of Embodiment 3-1, Figure 17 Fig. shows the schematic structural diagram of the optical imaging lens of Embodiment 3-2, Figure 18 Fig. shows the schematic structural diagram of the optical imaging lens of Embodiment 3-3.

[0128] As Figures 16 to 18 shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a third spacer first auxiliary element P3b, a third spacer second auxiliary element P3c, a fourth lens E4, a fourth spacer P4, a fourth spacer first auxiliary element P4b, and a fifth lens E5, which are sequentially arranged in the lens barrel P from the object side to the image side.

[0129] As Figure 16 shown, it is the schematic structural diagram of the optical imaging lens of Embodiment 3-1. In this example, a second spacer first auxiliary element P2b is further provided on the image side of the second spacer P2. The object side and the image side of the first spacer P1 are respectively in partial contact with the image side S2 of the first lens and the object side S3 of the second lens. The object side and the image side of the second spacer P2 are respectively in partial contact with the image side S4 of the second lens and the object side of the second spacer first auxiliary element P2b. The image side of the second spacer first auxiliary element P2b is in partial contact with the object side S5 of the third lens. The object side and the image side of the third spacer P3 are respectively in partial contact with the image side S6 of the third lens and the object side of the third spacer first auxiliary element P3b. The image side of the third spacer first auxiliary element P3b is in partial contact with the object side of the third spacer second auxiliary element P3c, and the image side of the third spacer second auxiliary element P3c is in partial contact with the object side S7 of the fourth lens. The object side and the image side of the fourth spacer P4 are respectively in partial contact with the image side S8 of the fourth lens and the object side of the fourth spacer first auxiliary element P4b. The image side of the fourth spacer first auxiliary element P4b is in partial contact with the object side S9 of the fifth lens.

[0130] As Figure 17As shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 3-2. The difference from Embodiment 3-1 is that in this example, the second spacer first auxiliary element P2b is not provided. At this time, the object side and the image side of the second spacer element P2 are respectively in partial contact with the image side S2 of the second lens and the object side S3 of the third lens. The abutting and contacting manners of the remaining spacer elements in this example are the same as those in Embodiment 3-1, and reference can be made to the relevant descriptions in Embodiment 3-1, which will not be elaborated here.

[0131] As Figure 18 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 3-3. The difference from Embodiment 3-2 is that in this example, a fourth spacer second auxiliary element P4c is further provided on the image side of the fourth spacer first auxiliary element P4b. At this time, the image side of the fourth spacer first auxiliary element P4b is in partial contact with the object side of the fourth spacer second auxiliary element P4c, and the image side of the fourth spacer second auxiliary element P4c is in partial contact with the object side S9 of the fifth lens. The abutting and contacting manners of the remaining spacer elements in this example are the same as those in Embodiment 3-2, and reference can be made to the relevant descriptions in Embodiment 3-2, which will not be elaborated here.

[0132] In summary, the structural parameters of the optical imaging lens in Embodiment 3 under Embodiment 3-1, Embodiment 3-2, and Embodiment 3-3 are shown in Table 8.

[0133] Table 8

[0134]

[0135] In Embodiment 3, the object side S1 of the first lens is a convex surface, and the image side S2 of the first lens is a convex surface. The object side S3 of the second lens is a convex surface, and the image side S4 of the second lens is a concave surface. The object side S5 of the third lens is a concave surface, and the image side S6 of the third lens is a convex surface. The object side S7 of the fourth lens is a concave surface, and the image side S8 of the fourth lens is a convex surface. The object side S9 of the fifth lens is a convex surface, and the image side S10 of the fifth lens is a concave surface.

[0136] In Embodiment 3, the effective focal length f1 of the first lens is 4.88 mm, the effective focal length f2 of the second lens is -8.86 mm, the effective focal length f3 of the third lens is -17.69 mm, the effective focal length f4 of the fourth lens is 28.65 mm, the effective focal length f5 of the fifth lens is -18.90 mm, the distance TD from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis of the optical imaging lens is 8.29 mm, the image height ImgH corresponding to the maximum field of view angle of the optical imaging lens is 3.31 mm, half of the maximum field of view angle HFOV of the optical imaging lens is 18.46°, the f-number Fno of the optical imaging lens is 2.00, the effective focal length f of the optical imaging lens is 9.84 mm, and the combined focal length f12 of the first lens and the second lens is 7.98 mm.

[0137] Table 9 shows the basic structural parameter table of the optical imaging lens in Embodiment 3, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0138] Table 9

[0139]

[0140] The following Table 10 gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface S1 - S10 in Embodiment 3.

[0141] Table 10

[0142]

[0143] Figure 19 shows the axial chromatic aberration curve of the optical imaging lens in Embodiment 3, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the optical imaging lens. Figure 20 shows the astigmatism curve of the optical imaging lens in Embodiment 3, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 21 shows the distortion curve of the optical imaging lens in Embodiment 3, which represents the distortion magnitude values corresponding to different image heights. Figure 22 shows the longitudinal chromatic aberration curve of the optical imaging lens in Embodiment 3, which represents the deviation of different image heights on the imaging plane after light rays pass through the optical imaging lens.

[0144] According to Figures 19 to 22 it can be known that the optical imaging lens given in Embodiment 3 can achieve good imaging quality.

[0145] In summary, Embodiments 1 to 3 respectively satisfy the relationships shown in Table 11.

[0146] Table 11

[0147]

[0148] Table 12 shows parameters such as half of the maximum field of view angle HFOV of the optical imaging lens of Embodiment 1 to Embodiment 3, the total optical length TTL of the optical imaging lens, and the effective focal length f of the optical imaging lens.

[0149] Table 12

[0150]

[0151] The present application also provides an optical device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The optical device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The optical device is equipped with the optical imaging lens described above.

[0152] In the present application, the above-mentioned optical imaging lens can be used as a telephoto lens in the field of photography.

[0153] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0154] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0155] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings 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 under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0156] The above are only the preferred embodiments of the present invention, and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that, It includes a lens barrel, a lens group and a spacer element group arranged in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, the first lens, the second lens, the third lens, the fourth lens and the fifth lens. The first lens has a positive optical power. The object side surface of the first lens is convex, and the image side surface of the first lens is convex. The second lens has a negative optical power. The object side surface of the second lens is convex, and the image side surface of the second lens is concave. The third lens has a negative optical power. The object side surface of the third lens is concave. The fourth lens has a positive optical power. The fifth lens has a negative optical power. The object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave. The spacer element group includes a third spacer element, a third spacer first auxiliary element and a third spacer second auxiliary element disposed between the third lens and the fourth lens, and also includes a fourth spacer element and a fourth spacer first auxiliary element disposed between the fourth lens and the fifth lens. The object side surface of the third spacer element is in partial contact with the image side surface of the third lens. The object side surface of the third spacer first auxiliary element is in partial contact with the image side surface of the third spacer element. The object side surface of the third spacer second auxiliary element is in partial contact with the image side surface of the third spacer first auxiliary element. The object side surface of the fourth spacer element is in partial contact with the image side surface of the fourth lens. The object side surface of the fourth spacer first auxiliary element is in partial contact with the image side surface of the fourth spacer element. Wherein, the distance TD on the optical axis of the object side surface of the first lens to the image side surface of the fifth lens, the air interval T34 on the optical axis between the third lens and the fourth lens, and the refractive index n3 of the third lens satisfy: 5.30 < TD / T34 × n3 ≤ 5.

95. The effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacer element satisfy: -5.05 ≤ f3 / d3s < -4.

55. The maximum axial thickness CP3b of the third spacer first auxiliary element, the inner diameter d3cm of the image side surface of the third spacer second auxiliary element and the inner diameter d3m of the image side surface of the third spacer element satisfy: 1.30 ≤ CP3b / (d3cm - d3m) < 1.

80.

2. The optical imaging lens according to claim 1, wherein The curvature radius R4 of the image side surface of the second lens, the curvature radius R5 of the object side surface of the third lens and the sum SP2t3 of the maximum axial thicknesses of all spacer elements between the second lens and the third lens satisfy: -12.50 < (R4 + R5) / SP2t3 < -5.

73.

3. The optical imaging lens according to claim 1, wherein The curvature radius R1 of the object side surface of the first lens, the outer diameter D0s of the object side end face of the lens barrel and the inner diameter d0s of the object side end face of the lens barrel satisfy: 1.23 ≤ R1 / (D0s - d0s) < 2.

50.

4. The optical imaging lens according to claim 1, wherein The spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side portion of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image-side portion of the second lens. The following condition is satisfied between the radius of curvature R3 of the object-side surface of the second lens and the axial distance EP12 from the image-side surface of the first spacer element to the object-side surface of the second spacer element: 8.90 < R3 / EP12 ≤ 10.

86.

5. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side portion of the first lens. The following condition is satisfied among the axial distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element, the central thickness CT1 of the first lens on the optical axis, and the Abbe number V1 of the first lens: 51.09 ≤ EP01 / CT1 × V1 ≤ 62.

15.

6. The optical imaging lens according to claim 1, wherein The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side portion of the second lens. The following condition is satisfied between the outer diameter D2s of the object-side surface of the second spacer element and the sum SP2t3 of the maximum axial thicknesses of all spacer elements between the second lens and the third lens: 10.85 ≤ D2s / SP2t3 < 13.

30.

7. The optical imaging lens according to claim 1, wherein The spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side portion of the first lens. The following condition is satisfied between the inner diameter d1s of the object-side surface of the first spacer element and the air gap T12 on the optical axis from the first lens to the second lens: 26.80 < d1s / T12 ≤ 32.

38.

8. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side portion of the second lens. The following condition is satisfied between the combined focal length f12 of the first lens and the second lens and the axial distance EP02 from the object-side end face of the lens barrel to the object-side surface of the second spacer element: 2.35 < f12 / EP02 < 3.

26.

9. The optical imaging lens according to claim 1, wherein The spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side portion of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image-side portion of the second lens. The following condition is satisfied between the axial distance EP12 from the image-side surface of the first spacer element to the object-side surface of the second spacer element and the central thickness CT2 of the second lens on the optical axis: 2.20 < EP12 / CT2 ≤ 2.

67.

10. The optical imaging lens according to claim 1, wherein The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side portion of the second lens. The following condition is satisfied between the axial distance EP23 from the image-side surface of the second spacer element to the object-side surface of the third spacer element and the central thickness CT3 of the third lens on the optical axis: 1.75 < EP23 / CT3 < 5.

05.

11. The optical imaging lens according to claim 1, characterized in that, The axial distance L from the object-side end face to the image-side end face of the lens barrel satisfies the following relationship with the sum SP3t4 of the maximum axial thicknesses of all spacer elements between the third lens and the fourth lens: 5.25 ≤ L / SP3t4 ≤ 6.

36.

12. The optical imaging lens according to claim 1, wherein, The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in partial contact with the image-side surface of the second lens. The axial distance EP34 from the image-side surface of the third spacer element to the object-side surface of the fourth spacer element satisfies the following relationship with the axial distance EP23 from the image-side surface of the second spacer element to the object-side surface of the third spacer element: 1.85 ≤ EP34 / EP23 < 4.

75.

13. The optical imaging lens according to claim 1, characterized in that, The maximum axial thickness CP4b of the fourth spacer first auxiliary element satisfies the following relationship with the air gap T45 between the fourth lens and the fifth lens on the optical axis: 2.20 < CP4b / T45 < 2.

70.

14. The optical imaging lens according to claim 1, wherein, The inner diameter d4s of the object-side surface of the fourth spacer element satisfies the following relationship with the maximum axial thickness CP4b of the fourth spacer first auxiliary element: 4.85 ≤ d4s / CP4b < 5.

90.

15. The optical imaging lens according to claim 1, wherein The effective focal length f of the optical imaging lens, the outer diameter D0m of the image-side end face of the lens barrel, and the outer diameter D0s of the object-side end face of the lens barrel satisfy the following relationship: 4.15 ≤ f / (D0m - D0s) < 10.

35.

16. The optical imaging lens according to claim 1, wherein The inner diameter d4m of the image-side surface of the fourth spacer element, the curvature radius R9 of the object-side surface of the fifth lens, and the curvature radius R10 of the image-side surface of the fifth lens satisfy the following relationship: 2.80 < d4m / (R9 - R10) < 4.80.

Images