Optical imaging lens

Abstract

The present invention provides an optical imaging lens. The number of lenses with optical power in the optical imaging lens is three. The optical imaging lens includes a lens group, a supporting element group, and a lens barrel. Among them, the axial distance T12 from the image side of the first lens to the object side of the second lens and the axial distance T23 from the image side of the second lens to the object side of the third lens satisfy: 1.4 < T12 / T23 < 2.0; the inner diameter d2m of the image side of the second supporting element, the inner diameter d1m of the image side of the first supporting element, and the distance EP12 from the image side of the first supporting element to the object side of the second supporting element along the optical axis of the optical imaging lens satisfy: 0.25 < (d2m - d1m) / EP12 < 1.5. This application solves the problem that the miniaturization and high imaging quality of the optical imaging lens in the prior art cannot be兼顾. It should be noted that the word "兼顾" in the original text is not a common English word. I've used a literal translation for now, but it might be better to find a more appropriate English expression to accurately convey the meaning. Maybe "be balanced" or "be taken into account" could be considered.

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] With the development of optical imaging lenses, users have increasingly higher requirements for the imaging quality and appearance of optical imaging lenses. In electronic products such as mobile phones, laptops, and tablets, the volume of the optical imaging lens accounts for a relatively large proportion, reducing the display space of the display screen and affecting the aesthetics. For a three-piece optical imaging lens, although it is easy to achieve miniaturized design due to the small number of lenses, the relatively thick thickness of the second lens seriously affects the refraction accuracy of light when passing through the center and edge of the second lens, resulting in discrete MTF curves and low peaks. Therefore, how to control the dimensional parameters of the supporting elements on both sides of the second lens to optimize the MTF performance while ensuring miniaturized design is a very important issue. Summary of the Invention

[0003] The main object of the present invention is to provide an optical imaging lens to solve the problem in the prior art that the miniaturization and high imaging quality of optical imaging lenses cannot be兼顾 simultaneously.

[0004] To achieve the above object, according to one aspect of the present invention, there is provided an optical imaging lens. The number of lenses with optical power in the optical imaging lens is three. The optical imaging lens includes: a lens group, from the object side to the image side of the optical imaging lens, the lens group includes a first lens to a third lens arranged sequentially at intervals. The refractive index of the first lens is the smallest among all the lenses in the lens group, and the Abbe number of the first lens is the largest among all the lenses in the lens group. The first lens has a negative optical power, the object side surface of the first lens is concave, the second lens has a positive optical power, the object side surface of the second lens is convex, the image side surface of the second lens is convex, the third lens has a negative optical power, and the paraxial region of the image side surface of the third lens is concave; a supporting element group, the supporting element group at least includes a first supporting element located between the first lens and the second lens and at least partially contacting the image side surface of the first lens, and a second supporting element located between the second lens and the third lens and at least partially contacting the image side surface of the second lens; a barrel, the lens group and the supporting element group are accommodated in the barrel; wherein, the axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the axial distance T23 from the image side surface of the second lens to the object side surface of the third lens satisfy: 1.4 < T12 / T23 < 2.0; the inner diameter d2m of the image side surface of the second supporting element, the inner diameter d1m of the image side surface of the first supporting element, and the distance EP12 from the image side surface of the first supporting element to the object side surface of the second supporting element along the optical axis of the optical imaging lens satisfy: 0.25 < (d2m - d1m) / EP12 < 1.5.

[0005] According to another aspect of the present invention, an optical imaging lens is provided. The number of lenses with optical power in the optical imaging lens is three. The optical imaging lens includes: a lens group. From the object side to the image side of the optical imaging lens, the lens group includes a first lens to a third lens arranged at intervals in sequence. The refractive index of the first lens is the smallest among all the lenses in the lens group, and the Abbe number of the first lens is the largest among all the lenses in the lens group. The first lens has a negative optical power, the object side surface of the first lens is concave, the second lens has a positive optical power, the object side surface of the second lens is convex, the image side surface of the second lens is convex, the third lens has a negative optical power, and the paraxial region of the image side surface of the third lens is concave; a supporting element group. The supporting element group at least includes a first supporting element located between the first lens and the second lens and at least partially contacting the image side surface of the first lens; a lens barrel. The lens group and the supporting element group are accommodated in the lens barrel; wherein, the curvature radius R1 of the object side surface of the first lens and the effective focal length f1 of the first lens satisfy: 0.45 < R1 / f1 < 0.80; the sagittal height SAG11 of the object side surface of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: -0.6 < SAG11 / CT1 < -0.3; the outer diameter D1s of the object side surface of the first supporting element and the inner diameter d1s of the object side surface of the first supporting element satisfy: 2.35 < (D1s - d1s) / d1s < 3.05.

[0006] Further, the curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical imaging lens satisfy: -0.75 < R1 / f < -0.55; the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first supporting element satisfy: -2.1 < f1 / d1s < -1.15.

[0007] Further, the entrance pupil diameter EPD of the optical imaging lens, the inner diameter d0s of the object side end surface of the lens barrel, and the inner diameter d1s of the object side surface of the first supporting element satisfy: 0.35 < EPD / (d0s - d1s) < 0.50; the inner diameter d0s of the object side end surface of the lens barrel, the effective focal length f of the optical imaging lens, and the maximum field angle FOV of the optical imaging lens satisfy: 1.60 < d0s / (f × tan(FOV / 2)) < 2.10.

[0008] Further, the sagittal height SAG11 of the object side surface of the first lens and the sagittal height SAG22 of the image side surface of the second lens satisfy: 0.30 < SAG11 / SAG22 ≤ 0.80; the distance EP12 along the optical axis from the image side surface of the first supporting element to the object side surface of the second supporting element and the central thickness CT2 of the second lens on the optical axis satisfy: 0.50 < EP12 / CT2 < 0.90.

[0009] Furthermore, the central thickness of the second lens on the optical axis is the largest among all the lenses in the lens group. The central thickness CT2 of the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.1 < CT2 / (CT1 + CT3) < 1.55; the central thickness CT2 of the second lens on the optical axis and the inner diameter d2m of the image side surface of the second supporting element satisfy: 0.4 < CT2 / d2m < 0.9.

[0010] Furthermore, the on-axis distance TD from the object side surface of the first lens to the image side surface of the third lens is less than the height L of the lens barrel. The on-axis distance TD from the object side surface of the first lens to the image side surface of the third lens, the height L of the lens barrel, and the sum ∑CT of the central thicknesses of the first lens, the second lens, and the third lens on the optical axis satisfy: 0.2 < (L - TD) / ∑CT < 1.45; the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first supporting element along the optical axis direction, the central thickness CT1 of the first lens on the optical axis, and the on-axis distance T12 from the image side surface of the first lens to the object side surface of the second lens satisfy: 1.25 ≤ (EP01 - CT1 - T12) / CT1 < 2.55.

[0011] Furthermore, the distance EP12 from the image side surface of the first supporting element to the object side surface of the second supporting element along the optical axis direction, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: 0.15 < EP12 / (R3 - R4) < 0.45.

[0012] Furthermore, the curvature radius R1 of the object side surface of the first lens and the effective focal length f1 of the first lens satisfy: 0.45 < R1 / f1 < 0.80; the sag SAG11 of the object side surface of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: -0.6 < SAG11 / CT1 < -0.3; the outer diameter D1s of the object side surface of the first supporting element and the inner diameter d1s of the object side surface of the first supporting element satisfy: 2.35 < (D1s - d1s) / d1s < 3.05.

[0013] Furthermore, the absolute value of the effective focal length of the second lens is the smallest among all the lenses in the lens group. The inner diameter d0m of the image side end surface of the lens barrel, the outer diameter D2m of the image side surface of the second supporting element, and the inner diameter d2m of the image side surface of the second supporting element satisfy: 0.2 < (d0m - D2m) / (D2m - d2m) < 0.85.

[0014] Furthermore, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -1.80 < f1 / f2 < -1.30; the effective radius DT11 of the object side of the first lens, the effective radius DT22 of the image side of the second lens, and the inner diameter d1s of the object side of the first supporting element satisfy: |DT11 - DT22| / d1s ≤ 0.05.

[0015] Furthermore, the effective radius DT32 of the image side of the third lens, the effective radius DT22 of the image side of the second lens, and the effective radius DT11 of the object side of the first lens satisfy: -3 < (DT32 - DT22) / (DT22 - DT11) < -0.65; the inner diameter d2s of the object side of the second supporting element and the inner diameter d1s of the object side of the first supporting element satisfy: 1.2 < d2s / d1s < 2.1.

[0016] Applying the technical solution of the present invention, the number of lenses with optical power in the optical imaging lens is three. The optical imaging lens includes a lens group, a supporting element group, and a lens barrel. From the object side to the image side of the optical imaging lens, the lens group includes the first lens to the third lens arranged at intervals in sequence. The refractive index of the first lens is the smallest among all the lenses in the lens group, and the Abbe number of the first lens is the largest among all the lenses in the lens group. The first lens has a negative optical power, the object side of the first lens is concave, the second lens has a positive optical power, the object side of the second lens is convex, the image side of the second lens is convex, the third lens has a negative optical power, and the paraxial region of the image side of the third lens is concave; the supporting element group at least includes a first supporting element located between the first lens and the second lens and at least partially contacting the image side of the first lens, and a second supporting element located between the second lens and the third lens and at least partially contacting the image side of the second lens; the lens group and the supporting element group are accommodated in the lens barrel; wherein, the axial distance T12 from the image side of the first lens to the object side of the second lens and the axial distance T23 from the image side of the second lens to the object side of the third lens satisfy: 1.4 < T12 / T23 < 2.0; the inner diameter d2m of the image side of the second supporting element, the inner diameter d1m of the image side of the first supporting element, and the distance EP12 from the image side of the first supporting element to the object side of the second supporting element along the optical axis of the optical imaging lens satisfy: 0.25 < (d2m - d1m) / EP12 < 1.5.

[0017] The optical imaging lens of the present application uses three lenses with optical power, and the first lens to the third lens are arranged in sequence at intervals. In the optical imaging lens of the present application, the axial distance from the image side of the first lens to the object side of the second lens and the axial distance from the image side of the second lens to the object side of the third lens satisfy 1.4 < T12 / T23 < 2.0. The overall length of the entire optical imaging lens is relatively small, having the characteristics of miniaturization. However, the central thickness of the second lens on the optical axis is relatively thick, reducing the refraction accuracy of light when passing through the center and edge of the second lens, resulting in discrete MTF curves and low peaks. The present application adjusts the degree of light deflection when passing through the second lens by restricting (d2m - d1m) / EP12 within a reasonable range, reasonably configuring the inner diameter difference of the supporting elements on both sides of the second lens and the thickness of the second lens along the optical axis at the non-effective diameter, reducing the eccentricity and tilt sensitivity of the optical imaging lens, making the field curvature reach the optimal state, improving the problems of discrete MTF and low peaks, and making the performance of the optical imaging lens more stable. Description of the Drawings

[0018] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 It shows a partial parameter schematic diagram of an optical imaging lens according to any optional embodiment of the present invention;

[0020] Figure 2 It shows a schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present invention;

[0021] Figure 3 It shows a schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present invention;

[0022] Figure 4 It shows a schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present invention;

[0023] Figure 5 It shows the axial chromatic aberration curve of the optical imaging lens according to Embodiment 1;

[0024] Figure 6 It shows the astigmatism curve of the optical imaging lens according to Embodiment 1;

[0025] Figure 7 It shows the distortion curve of the optical imaging lens according to Embodiment 1;

[0026] Figure 8 It shows the lateral chromatic aberration curve of the optical imaging lens according to Embodiment 1;

[0027] Figure 9The relative illumination curve of the optical imaging lens of Embodiment 1 is shown;

[0028] Figure 10 A schematic diagram of the structure of the optical imaging lens of Embodiment 4 of the present invention is shown;

[0029] Figure 11 A schematic diagram of the structure of the optical imaging lens according to Embodiment 5 of the present invention is shown;

[0030] Figure 12 A schematic diagram of the structure of the optical imaging lens according to Embodiment Six of the present invention is shown;

[0031] Figure 13 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown;

[0032] Figure 14 The astigmatism curve of the optical imaging lens of Embodiment 4 is shown;

[0033] Figure 15 The distortion curve of the optical imaging lens in Embodiment 4 is shown;

[0034] Figure 16 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown;

[0035] Figure 17 The relative illumination curve of the optical imaging lens of Embodiment 4 is shown;

[0036] Figure 18 A schematic diagram of the structure of the optical imaging lens of Embodiment 7 of the present invention is shown;

[0037] Figure 19 A schematic diagram of the structure of the optical imaging lens of Embodiment 8 of the present invention is shown;

[0038] Figure 20 A schematic diagram of the structure of the optical imaging lens of Embodiment 9 of the present invention is shown;

[0039] Figure 21 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment Seven is shown;

[0040] Figure 22 The astigmatism curve of the optical imaging lens of Embodiment 7 is shown;

[0041] Figure 23 The distortion curve of the optical imaging lens of Embodiment 7 is shown;

[0042] Figure 24 The magnification chromatic aberration curve of the optical imaging lens of Embodiment Seven is shown;

[0043] Figure 25The relative illumination curve of the optical imaging lens of Embodiment Seven is shown;

[0044] Figure 26 The defocus MTF curve of the optical imaging lens of Embodiment 4 of the present invention is shown under the conditions of T12 / T23=1.94 and (d2m-d1m) / EP12=0.50;

[0045] Figure 27 The defocus MTF curve of the optical imaging lens of Comparative Example 1 is shown under the conditions of T12 / T23=1.94 and (d2m-d1m) / EP12=0.15.

[0046] Figure 28 The defocus MTF curve of the optical imaging lens of Comparative Example 2 is shown under the conditions of T12 / T23=1.94 and (d2m-d1m) / EP12=2.45.

[0047] The above figures include the following reference numerals:

[0048] P0, Lens tube; E1, First lens; P1, First support element; E2, Second lens; P2, Second support element; E3, Third lens; S1, Object side of the first lens; S2, Image side of the first lens; S3, Object side of the second lens; S4, Image side of the second lens; S5, Object side of the third lens; S6, Image side of the third lens. Detailed Implementation

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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 skilled in the art, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens data in optical software) to determine convexity or concavity. For the eye-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the display-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0055] To address the problem of the inability to simultaneously achieve miniaturization and high imaging quality in existing optical imaging lenses, this invention provides an optical imaging lens.

[0056] First Implementation Method

[0057] like Figures 1 to 26As shown, the number of lenses with optical power in the optical imaging lens is three. The optical imaging lens includes a lens group, a supporting element group, and a lens barrel. From the object side to the image side of the optical imaging lens, the lens group includes the first lens to the third lens arranged at intervals in sequence. The refractive index of the first lens is the smallest among all the lenses in the lens group, and the Abbe number of the first lens is the largest among all the lenses in the lens group. The first lens has a negative optical power, the object side surface of the first lens is concave, the second lens has a positive optical power, the object side surface of the second lens is convex, the image side surface of the second lens is convex, the third lens has a negative optical power, and the paraxial region of the image side surface of the third lens is concave; the supporting element group at least includes a first supporting element located between the first lens and the second lens and at least partially contacting the image side surface of the first lens, and a second supporting element located between the second lens and the third lens and at least partially contacting the image side surface of the second lens; the lens group and the supporting element group are accommodated in the lens barrel; wherein, the axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the axial distance T23 from the image side surface of the second lens to the object side surface of the third lens satisfy: 1.4 < T12 / T23 < 2.0; the inner diameter d2m of the image side surface of the second supporting element, the inner diameter d1m of the image side surface of the first supporting element, and the distance EP12 from the image side surface of the first supporting element to the object side surface of the second supporting element along the optical axis of the optical imaging lens satisfy: 0.25 < (d2m - d1m) / EP12 < 1.5.

[0058] The optical imaging lens of the present application uses three lenses with optical power, and the first lens to the third lens are arranged at intervals in sequence. In the optical imaging lens of the present application, the axial distance from the image side surface of the first lens to the object side surface of the second lens and the axial distance from the image side surface of the second lens to the object side surface of the third lens satisfy 1.4 < T12 / T23 < 2.0, and the height of the entire optical imaging lens is controlled within a range not greater than 1.6 mm, having the feature of miniaturization. However, the central thickness of the second lens on the optical axis is relatively thick, reducing the refraction accuracy of light when passing through the center and edge of the second lens, resulting in a discrete MTF curve and a lower peak value. The present application limits (d2m - d1m) / EP12 within a reasonable range, rationally configures the inner diameter difference of the supporting elements on both sides of the second lens and the thickness along the optical axis at the non-effective diameter of the second lens, adjusts the deflection degree of light when passing through the second lens, reduces the eccentricity and tilt sensitivity of the optical imaging lens, makes the field curvature reach the best state, improves the problems of discrete MTF and lower peak value, and makes the performance of the optical imaging lens more stable.

[0059] As shown in Table 1 and Figures 26 to 28As shown, the defocus MTF curves of the optical imaging lenses of Embodiment 4 of this application and Comparative Examples 1 and 2 are presented under different conditions of T12 / T23=1.94 and (d2m-d1m) / EP12 values. The defocus MTF curves are used to illustrate the changes in the imaging quality of the optical imaging lens and describe its image transmission capability at different spatial frequencies. The X-axis represents the defocus position (unit: mm), indicating the position where the image deviates from the optimal focus (X=0mm), and the Y-axis represents the MTF value.

[0060] Table 1

[0061]

[0062] As shown in Comparative Examples 1 and 2, with T12 / T23 = 1.94, the value of (d2m-d1m) / EP12 in Comparative Example 1 is 0.15. Figure 27 As shown, when the value of (d2m-d1m) / EP12 is too small, the light rays emitted from the third lens become steeper, the field curvature of the optical imaging lens is larger, the MTF peak value decreases in most fields of view, and the optical imaging lens is more sensitive to eccentricity and tilt; in Comparative Example 2, the value of (d2m-d1m) / EP12 is 2.45, as... Figure 28 As shown, when the value of (d2m-d1m) / EP12 is too large, the edge surface sensitivity of the second lens increases, the MTF peak value decreases in most fields of view, and the field curvature is more positive.

[0063] The value of the conditional expression corresponding to the optical imaging lens shown in Embodiment 4 of this application is T12 / T23=1.94, and (d2m-d1m) / EP12=0.50, satisfying 0.25<(d2m-d1m) / EP12<1.5. Figure 26 As shown, the MTF peak is relatively high in most fields of view, which means that the optical sensitivity of the optical imaging lens is low and the performance is more stable.

[0064] In this embodiment, the relationship between the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical imaging lens satisfies: -0.75 < R1 / f < -0.55; the relationship between the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first supporting element satisfies: -2.1 < f1 / d1s < -1.15. By restricting R1 / f and f1 / d1s within a reasonable range, the refractive power of the first lens, the inner diameter size of the first supporting element, and the effective focal length of the optical imaging lens are constrained, ensuring that all the light rays passing through the first lens enter the second lens, and the effective light rays after passing through the inner diameter of the first supporting element can be captured and transmitted by the second lens, ensuring that the light rays present a certain angle when passing through the third lens, and finally all the effective light rays are received by the imaging surface when exiting the optical imaging lens. At the same time, it also helps to correct off-axis aberrations, thereby improving the overall image quality of the optical imaging lens.

[0065] In this embodiment, the relationship between the entrance pupil diameter EPD of the optical imaging lens, the inner diameter d0s of the object side end surface of the lens barrel, and the inner diameter d1s of the object side surface of the first supporting element satisfies: 0.35 < EPD / (d0s - d1s) < 0.50; the relationship between the inner diameter d0s of the object side end surface of the lens barrel, the effective focal length f of the optical imaging lens, and the maximum field angle FOV of the optical imaging lens satisfies: 1.60 < d0s / (f × tan(FOV / 2)) < 2.10. By restricting EPD / (d0s - d1s) within a reasonable range, on the premise of ensuring that all the effective light paths enter the optical imaging lens, excess light paths can be blocked to reduce the generation of stray light. At the same time, by restricting d0s / (f × tan(FOV / 2)) within a reasonable range, the length of the entire optical imaging lens along the optical axis can be effectively reduced, making the length of the entire optical imaging lens along the optical axis reach the minimum. Preferably, the length of the optical imaging lens along the optical axis direction is less than or equal to 1.6 mm.

[0066] In this embodiment, the relationship between the sag SAG11 of the object side surface of the first lens and the sag SAG22 of the image side surface of the second lens satisfies: 0.30 < SAG11 / SAG22 ≤ 0.80; the relationship between the distance EP12 along the optical axis from the image side surface of the first supporting element to the object side surface of the second supporting element and the central thickness CT2 of the second lens on the optical axis satisfies: 0.50 < EP12 / CT2 < 0.90. By restricting SAG11 / SAG22 within a reasonable range, the outer diameter size of the lens barrel can be controlled, making the layout of the entire optical imaging lens more reasonable. At the same time, in combination with the relationship between the first supporting element, the second supporting element, and the central thickness of the second lens, the trend of the effective light path within the optical imaging lens can be constrained, making the light ray angles in the marginal field of view within a reasonable range, effectively reducing the sensitivity of the optical imaging lens, which is beneficial to improving the MTF peak value of the optical imaging lens.

[0067] In this embodiment, the central thickness of the second lens on the optical axis is the largest among all the lenses of the lens group. The central thickness CT2 of the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.1 < CT2 / (CT1 + CT3) < 1.55; the central thickness CT2 of the second lens on the optical axis and the inner diameter d2m of the image side surface of the second supporting element satisfy: 0.4 < CT2 / d2m < 0.9. On the premise that the central thickness of the second lens on the optical axis is the largest, by restricting CT2 / (CT1 + CT3) and CT2 / d2m within a reasonable range, not only is the lens layout within the entire optical imaging lens optimized, improving the structural stability of the optical imaging lens, but also the overall size of the optical imaging lens is effectively controlled, which is conducive to the miniaturized design of the module. In addition, the performance upper limit of the optical imaging lens is increased, the axial chromatic aberration and field curvature are optimized, and thus the MTF performance of the optical imaging lens is improved.

[0068] In this embodiment, the on-axis distance TD from the object side surface of the first lens to the image side surface of the third lens is less than the height L of the lens barrel. The on-axis distance TD from the object side surface of the first lens to the image side surface of the third lens, the height L of the lens barrel, and the sum ∑CT of the central thicknesses of the first lens, the second lens, and the third lens on the optical axis satisfy: 0.2 < (L - TD) / ∑CT < 1.45; the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first supporting element along the optical axis, the central thickness CT1 of the first lens on the optical axis, and the on-axis distance T12 from the image side surface of the first lens to the object side surface of the second lens satisfy: 1.25 ≤ (EP01 - CT1 - T12) / CT1 < 2.55. By controlling the total length of the lenses of the optical imaging lens to be less than the height of the lens barrel and restricting (L - TD) / ∑CT within a reasonable range, it is ensured that both ends of the first lens to the third lens of the entire small optical imaging lens are disposed within the object side end surface and the image side end surface of the lens barrel, thereby preventing the lenses at both ends, that is, the first lens and the third lens, from being scratched during the assembly and transportation processes. At the same time, the center of the object side surface of the first lens is closer to the image side surface than the edge, resulting in a larger opening space at the front end of the optical imaging lens, ensuring a larger viewing angle and improving the imaging quality of the entire optical imaging lens.

[0069] In this embodiment, the distance EP12 from the image side of the first supporting element to the object side of the second supporting element in the direction of the optical axis, the radius of curvature R3 of the object side of the second lens, and the radius of curvature R4 of the image side of the second lens satisfy: 0.15 < EP12 / (R3 - R4) < 0.45. By limiting EP12 / (R3 - R4) within a reasonable range, the light rays can be effectively diverged after passing through the second lens, and at the same time, the optical path can be optimized, so that the third lens can balance the amount of third-order distortion aberration introduced by the first lens and the second lens. Furthermore, the optical imaging lens can reasonably control the distortion. Especially at a wide viewing angle, the distortion phenomenon at the edge of the imaging surface can be significantly improved, and the imaging clarity and picture realism of the optical imaging lens can be enhanced.

[0070] In this embodiment, the radius of curvature R1 of the object side of the first lens and the effective focal length f1 of the first lens satisfy: 0.45 < R1 / f1 < 0.80; the sag SAG11 of the object side of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: -0.6 < SAG11 / CT1 < -0.3; the outer diameter D1s of the object side of the first supporting element and the inner diameter d1s of the object side of the first supporting element satisfy: 2.35 < (D1s - d1s) / d1s < 3.05. The optical lens of the present application satisfies 0.45 < R1 / f1 < 0.80, which controls the incident angle of the light rays when entering the first lens, ensures that the light rays can be effectively received and processed by the subsequent lens group, and thus improves the light flux and imaging efficiency of the entire optical imaging lens. However, at the same time, since the first lens has a negative optical power, it is difficult to control the large-angle light rays after diffusion, resulting in relatively serious spherical aberration of the optical imaging lens. Therefore, by limiting SAG11 / CT1 and (D1s - d1s) / d1s within a reasonable range, the shape of the first lens and its ability to control the light rays can be effectively controlled, ensuring that the light rays can smoothly transition from the first lens to the second lens, balancing the positive third-order spherical aberration and the subsequent fifth-order spherical aberration generated at the front end of the optical imaging lens, which is beneficial to improving the imaging quality of the on-axis field of view.

[0071] In this embodiment, the absolute value of the effective focal length of the second lens is the smallest among all the lenses of the lens group. The following relationship is satisfied among the inner diameter d0m of the image-side end face of the lens barrel, the outer diameter D2m of the image-side surface of the second bearing element, and the inner diameter d2m of the image-side surface of the second bearing element: 0.2 < (d0m - D2m) / (D2m - d2m) < 0.85. The absolute value of the effective focal length of the second lens is the smallest among all the lenses of the lens group, which reduces the sensitivity of the second lens while balancing the optical powers of the first lens and the third lens. At the same time, by restricting (d0m - D2m) / (D2m - d2m) within a reasonable range, it can ensure that all the effective light paths are incident on the imaging surface after passing through the lens group, block the redundant light paths, reduce the generation of stray light, and improve the imaging cleanliness. In addition, on the premise that the wall thickness of the lens barrel ensures sufficient strength, the outer diameter of the lens barrel can be minimized, further reducing the volume of the optical imaging lens, which is beneficial to the miniaturization design.

[0072] In this embodiment, the following relationships are satisfied between the effective focal length f1 of the first lens and the effective focal length f2 of the second lens: -1.80 < f1 / f2 < -1.30; and between the effective radius DT11 of the object-side surface of the first lens, the effective radius DT22 of the image-side surface of the second lens, and the inner diameter d1s of the object-side surface of the first bearing element: |DT11 - DT22| / d1s ≤ 0.05. By restricting f1 / f2 and |DT11 - DT22| / d1s within a reasonable range, the trend of light rays can be reasonably controlled, and the difference in the effective radii of the object-side surface of the first lens and the image-side surface of the second lens can also be reduced, which helps to achieve a compact layout of the lens group, reduce the length and end dimensions of the optical imaging lens, improve the compactness of the optical imaging lens, and at the same time helps to correct off-axis aberrations, avoiding the deviation of the light path and the increase in aberrations caused by too large difference in the effective radii of the lenses, thereby improving the overall image quality of the optical imaging lens.

[0073] In this embodiment, the following relationships are satisfied among the effective radius DT32 of the image-side surface of the third lens, the effective radius DT22 of the image-side surface of the second lens, and the effective radius DT11 of the object-side surface of the first lens: -3 < (DT32 - DT22) / (DT22 - DT11) < -0.65; and between the inner diameter d2s of the object-side surface of the second bearing element and the inner diameter d1s of the object-side surface of the first bearing element: 1.2 < d2s / d1s < 2.1. By restricting (DT32 - DT22) / (DT22 - DT11) within a reasonable range, the radii of the optical effective regions of the three lenses can be controlled, so that the difference in the outer diameters of the three lenses is within a reasonable range, reducing the assembly step difference between adjacent lenses and ensuring the structural stability of the optical imaging lens. At the same time, by restricting d2s / d1s within a reasonable range and controlling the inner diameters of the object-side surfaces of the first bearing element and the second bearing element, the non-effective light paths can be effectively blocked, the risk of stray light can be reduced, and the imaging quality of the optical imaging lens can be improved.

[0074] Second Embodiment

[0075] As Figures 1 to 26 shown, the number of lenses with optical power in the optical imaging lens is three. The optical imaging lens includes a lens group, a supporting element group, and a lens barrel. From the object side to the image side of the optical imaging lens, the lens group includes the first lens to the third lens arranged at intervals in sequence. The refractive index of the first lens is the smallest among all the lenses in the lens group, and the Abbe number of the first lens is the largest among all the lenses in the lens group. The first lens has a negative optical power, the object side surface of the first lens is concave, the second lens has a positive optical power, the object side surface of the second lens is convex, the image side surface of the second lens is convex, the third lens has a negative optical power, and the paraxial region of the image side surface of the third lens is concave; at least the first supporting element located between the first lens and the second lens and at least partially contacting the image side surface of the first lens is included in the supporting element group; the lens group and the supporting element group are accommodated in the lens barrel; wherein, the following relationships are satisfied between the radius of curvature R1 of the object side surface of the first lens and the effective focal length f1 of the first lens: 0.45 < R1 / f1 < 0.80; the following relationships are satisfied between the sag SAG11 of the object side surface of the first lens and the central thickness CT1 of the first lens on the optical axis: -0.6 < SAG11 / CT1 < -0.3; the following relationship is satisfied between the outer diameter D1s and the inner diameter d1s of the object side surface of the first supporting element: 2.35 < (D1s - d1s) / d1s < 3.05.

[0076] The optical imaging lens of the present application uses three lenses with optical power, and the first lens to the third lens are arranged at intervals in sequence. The optical lens of the present application satisfies 0.45 < R1 / f1 < 0.80, controls the incident angle of light when entering the first lens, ensures that the light can be effectively received and processed by the subsequent lens group, and thus improves the light flux and imaging efficiency of the entire optical imaging lens. However, at the same time, since the first lens has a negative optical power, it is more difficult to control the large-angle light after diffusion, resulting in a relatively serious spherical aberration of the optical imaging lens. Therefore, by restricting SAG11 / CT1 and (D1s - d1s) / d1s within a reasonable range, the shape of the first lens and its light control ability can be effectively controlled, ensuring that the light can smoothly transition from the first lens to the second lens, balancing the positive third-order spherical aberration and the posterior fifth-order spherical aberration generated at the front end of the optical imaging lens, and being beneficial to improving the imaging quality of the on-axis field.

[0077] It should be noted that other conditional expressions in the above embodiments are also included in this embodiment, which will not be elaborated here one by one.

[0078] Optionally, the above optical imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0079] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0080] Figure 1 A schematic diagram showing the dimensions of an optical imaging lens according to this application is provided. Figure 1 The parameters d1s, D2m, L, EP12, etc., are clearly and intuitively indicated to provide a clear understanding of their meaning. To facilitate the description of the optical imaging lens and the specific lens shape, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0081] It should be noted that in an optical imaging lens, the sagitta SAG11 of the object-side surface of the first lens represents the axial displacement between the intersection of the object-side surface of the first lens and the optical axis and the vertex of the effective radius of the object-side surface of the first lens. Similarly, the sagitta SAG22 of the image-side surface of the second lens represents the axial displacement between the intersection of the image-side surface of the second lens and the optical axis and the vertex of the effective radius of the image-side surface of the second lens. The height L of the lens barrel represents the distance along the optical axis from the object-side end face of the lens barrel to the image-side end face of the lens barrel.

[0082] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical imaging lenses applicable to the above embodiments.

[0083] It should be noted that any one of the following embodiments, from Embodiment 1 to Embodiment 9, is applicable to all implementation methods of this application.

[0084] Example 1

[0085] like Figure 2 As shown, an optical imaging lens according to Embodiment 1 of this application is described. Figure 2 A schematic diagram of the optical imaging lens of Embodiment 1 is shown.

[0086] like Figure 2 As shown, the optical imaging lens includes, from the object side to the image side, the following components housed within the lens barrel P0: a first lens E1, a first support element P1, a second lens E2, a second support element P2, and a third lens E3.

[0087] In this embodiment, the first lens E1 has negative optical power, its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens E2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S5 has a concave paraxial region, and its image-side surface S6 has a concave paraxial region. The optical imaging lens also includes a filter (not shown in the figure), which has an object-side surface S7 and an image-side surface S8. Light rays from the object surface pass through S1 to S8 to reach the imaging surface S9.

[0088] Table 2 shows the basic structural parameters of the optical imaging lens in Embodiment 1, where the units for radius of curvature, thickness / distance, effective radius, and focal length are all millimeters (mm).

[0089] Table 2

[0090]

[0091] In Embodiment 1, all lenses are aspherical lenses. In particular, the image-side surface S2 of the first lens and the image-side surface S6 of the third lens are odd-order aspherical surfaces.

[0092] Specifically, the shape of an aspherical surface can be defined using, but is not limited to, the following aspherical formulas:

[0093] Formula (1);

[0094] Where x is the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface.

[0095] Specifically, the surface shape of odd-order aspherical lenses can be defined using, but is not limited to, the following aspherical formulas:

[0096] Formula (2);

[0097] Where z is the distance vector from the vertex of the aspherical surface along the optical axis at a height of r; c is the curvature of the surface pole c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 2 above); k is the conic coefficient; A, B, C, D, E, F, G, H, J, L, M are the correction coefficients of the aspherical surface at the 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th, 20th, 22nd, and 24th orders, respectively.

[0098] Table 3 below shows the higher-order coefficients that can be used for each aspherical mirror S1-S6 in Example 1.

[0099] Table 3

[0100]

[0101] 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 field of view angles. Figure 8 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the degree to which the focal points of light of different wavelengths do not completely coincide. Figure 9 The relative illumination curve of the optical imaging lens in Embodiment 1 is shown, which represents the brightness variation of the imaging surface of the optical imaging lens at different field of view angles.

[0102] according to Figures 5 to 9 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0103] Example 2

[0104] like Figure 3 As shown, an optical imaging lens according to Embodiment 2 of this application is described. The difference between it and Embodiment 1 is that the distance and thickness between the various supporting elements, lenses, lens barrels, etc. are different.

[0105] Figure 3 A schematic diagram of the optical imaging lens of Embodiment 2 is shown. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted. In this embodiment, the outer diameter of the object side of the first supporting element P1, the outer diameter of the image side of the second supporting element P2, and the height of the lens barrel P0 are all appropriately reduced, which is beneficial to the miniaturization of the optical imaging lens.

[0106] Example 3

[0107] like Figure 4 As shown, an optical imaging lens according to Embodiment 3 of this application is described. The difference between this lens and Embodiment 1 is that the distance and thickness between the various supporting elements, lenses, lens barrels, etc. are different.

[0108] Figure 4A schematic diagram of the optical imaging lens of Embodiment 3 is shown. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted. In this embodiment, the wall thickness in the middle of the lens barrel P0 is reduced, and the width of the annular band of the second supporting element P2 is increased while the thickness is moderately reduced. This not only helps to reduce the weight and volume of the optical imaging lens, but also helps to improve the supporting stability of the second lens E2 and the third lens E3.

[0109] Example 4

[0110] like Figure 10 As shown, an optical imaging lens according to Embodiment 4 of this application is described. Figure 10 A schematic diagram of the optical imaging lens of Embodiment 4 is shown.

[0111] like Figure 10 As shown, the optical imaging lens includes, from the object side to the image side, the following components housed in the lens barrel P0: a first lens E1, a first support element P1, a second lens E2, a second support element P2, and a third lens E3.

[0112] In this embodiment, the first lens E1 has negative optical power, its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens E2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its paraxial region of the object-side surface S5 is convex, and its paraxial region of the image-side surface S6 is concave. The optical imaging lens also includes a filter (not shown in the figure), which has an object-side surface S7 and an image-side surface S8. Light rays from the object surface pass through S1 to S8 to reach the imaging surface S9.

[0113] Table 4 shows the basic structural parameters of the optical imaging lens of Embodiment 4, where the units for radius of curvature, thickness / distance, effective radius and focal length are all millimeters (mm).

[0114] Table 4

[0115]

[0116] Table 5 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formulas (1) and (2) given in Embodiment 1 above. In this embodiment, each lens is an aspherical lens, and in particular, the image-side surface S2 of the first lens and the image-side surface S6 of the third lens are odd-order aspherical surfaces.

[0117] Table 5

[0118]

[0119] Figure 13The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 14 The astigmatism curve of the optical imaging lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 15 The distortion curve of the optical imaging lens of Embodiment 4 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 16 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the degree to which the focal points of light of different wavelengths do not completely coincide. Figure 17 The relative illumination curve of the optical imaging lens in Embodiment 4 is shown, which represents the brightness variation of the imaging surface of the optical imaging lens at different field of view angles.

[0120] according to Figures 13 to 17 It can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0121] Example 5

[0122] like Figure 11 As shown, an optical imaging lens according to Embodiment 5 of this application is described. The difference between this lens and Embodiment 4 is that the distance and thickness between the various supporting elements, lenses, lens barrels, etc. are different.

[0123] Figure 11 A schematic diagram of the optical imaging lens of Embodiment 5 is shown. For the sake of brevity, descriptions similar to those in Embodiment 4 are omitted. In this embodiment, the thickness of the second support element P2 is significantly reduced, making the structure of the optical imaging lens more compact. At the same time, the outer diameter of the object side of the first support element P1, the outer diameter of the image side of the second support element P2, and the height of the lens barrel P0 are all moderately reduced, which is beneficial to the miniaturization of the optical imaging lens.

[0124] Example 6

[0125] like Figure 12 As shown, an optical imaging lens according to Embodiment Six of this application is described. The difference between this lens and Embodiment Four is that the distances and thicknesses between the various supporting elements, lenses, lens barrels, etc., are different.

[0126] Figure 12 A schematic diagram of the optical imaging lens of Embodiment Six is ​​shown. For the sake of brevity, descriptions similar to those in Embodiment Four are omitted. In this embodiment, the thickness of the second support element P2 is significantly reduced, making the structure of the optical imaging lens more compact. At the same time, the outer diameter of the object side of the first support element P1, the outer diameter of the image side of the second support element P2, and the height of the lens barrel P0 are all moderately reduced, which is beneficial to the miniaturization of the optical imaging lens.

[0127] Example 7

[0128] like Figure 18 The image shows an optical imaging lens according to Embodiment Seven of this application. Figure 18 A schematic diagram of the optical imaging lens of Embodiment 7 is shown.

[0129] like Figure 18 As shown, the optical imaging lens includes, from the object side to the image side, the following components housed within the lens barrel P0: a first lens E1, a first support element P1, a second lens E2, a second support element P2, and a third lens E3.

[0130] In this embodiment, the first lens E1 has negative optical power, and both its object-side surface S1 and image-side surface S2 are concave. The second lens E2 has positive optical power, and both its object-side surface S3 and image-side surface S4 are convex. The third lens E3 has negative optical power, and both its object-side surface S5 and image-side surface S6 are concave. The optical imaging lens also includes a filter (not shown in the figure), which has an object-side surface S7 and an image-side surface S8. Light rays from the object surface pass through S1 to S8 to reach the imaging surface S9.

[0131] Table 6 shows the basic structural parameters of the optical imaging lens of Embodiment 7, wherein the units of radius of curvature, thickness / distance, effective radius and focal length are all millimeters (mm).

[0132] Table 6

[0133]

[0134] Table 7 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formulas (1) and (2) given in Embodiment 1 above. In this embodiment, each lens is an aspherical lens, and in particular, the image-side surface S2 of the first lens and the image-side surface S6 of the third lens are odd-order aspherical surfaces.

[0135] Table 7

[0136]

[0137] Figure 21 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 7 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 22 The astigmatism curve of the optical imaging lens of Embodiment 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 23 The distortion curve of the optical imaging lens of Embodiment 7 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 24The magnification chromatic aberration curve of the optical imaging lens of Embodiment 7 is shown, which represents the degree to which the focal points of light of different wavelengths do not completely coincide. Figure 25 The relative illumination curve of the optical imaging lens of Embodiment 7 is shown, which represents the brightness variation of the imaging surface of the optical imaging lens at different field of view angles.

[0138] according to Figures 21 to 25 It can be seen that the optical imaging lens given in Example 7 can achieve good imaging quality.

[0139] Example 8

[0140] like Figure 19 As shown, an optical imaging lens of Embodiment 8 of this application is described. The difference between this lens and Embodiment 7 is that the distances and thicknesses between the various supporting elements, lenses, lens barrels, etc., are different.

[0141] Figure 19 A schematic diagram of the optical imaging lens of Embodiment 8 is shown. For the sake of brevity, descriptions similar to those in Embodiment 7 are omitted. In this embodiment, the inner and outer diameters of the first supporting element P1, the outer diameter of the image-side surface of the second supporting element P2, and the height of the lens barrel P0 are all appropriately reduced. This not only helps to block non-imaging light rays in the middle of the optical imaging lens, but also facilitates the miniaturization of the optical imaging lens.

[0142] Example 9

[0143] like Figure 20 As shown, an optical imaging lens of Embodiment Nine of this application is described. The difference between Embodiment Seven and Embodiment Nine is that the distance and thickness between the various supporting elements, lenses, lens barrels, etc. are different.

[0144] Figure 20 A schematic diagram of the optical imaging lens of Embodiment Nine is shown. For the sake of brevity, descriptions similar to those in Embodiment Seven are omitted. In this embodiment, the inner and outer diameters of the first supporting element P1, the outer diameter of the image-side surface of the second supporting element P2, and the height of the lens barrel P0 are all appropriately reduced. This not only helps to block non-imaging light rays in the middle of the optical imaging lens, but also facilitates the miniaturization of the optical imaging lens.

[0145] In summary, embodiments one through nine of the optical imaging lens satisfy the relationships shown in Table 8.

[0146] Table 8

[0147]

[0148] Table 9 provides the parameters of each lens, support element, and lens barrel of the optical imaging lens in Examples 1 to 9, in mm. Here, f3 is the effective focal length of the third lens in mm; FOV is the field of view of the optical imaging lens in °.

[0149] Table 9

[0150]

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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, The optical imaging lens has three pieces of lenses with optical power, and the optical imaging lens comprises: A lens group, the lens group comprises first to third lenses arranged in sequence from the object side to the image side of the optical imaging lens, the first lens has the smallest refractive index among all the lenses of the lens group, and the first lens has the largest Abbe number among all the lenses of the lens group, The first lens has negative optical power, the object side surface of the first lens is a concave surface, the second lens has positive optical power, the object side surface of the second lens is a convex surface, the image side surface of the second lens is a convex surface, and the third lens has negative optical power, the near-axis region of the image side surface of the third lens is a concave surface; A bearing element group, the bearing element group at least comprises a first bearing element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, and a second bearing element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens; A lens barrel, the lens group and the bearing element group are accommodated in the lens barrel; Wherein, the axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the axial distance T23 from the image side surface of the second lens to the object side surface of the third lens satisfy: 1.4 < T12 / T23 < 2.0; The inner diameter d2m of the image side surface of the second bearing element, the inner diameter d1m of the image side surface of the first bearing element, and the distance EP12 from the image side surface of the first bearing element to the object side surface of the second bearing element along the optical axis of the optical imaging lens satisfy: 0.25 < (d2m-d1m) / EP12 < 1.

5. 2.The optical imaging lens according to claim 1, wherein, The curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical imaging lens satisfy: -0.75 < R1 / f < -0.55; the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first bearing element satisfy: -2.1 < f1 / d1s < -1.

15. 3.The optical imaging lens according to claim 1, wherein, The entrance pupil diameter EPD of the optical imaging lens, the inner diameter d0s of the object side end surface of the lens barrel, and the inner diameter d1s of the object side surface of the first bearing element satisfy: 0.35 < EPD / (d0s-d1s) < 0.50; the inner diameter d0s of the object side end surface of the lens barrel, the effective focal length f of the optical imaging lens, and the maximum field of view FOV of the optical imaging lens satisfy: 1.60 < d0s / (f*tan(FOV / 2)) < 2.

10. 4.The optical imaging lens according to claim 1, wherein, The sagittal height SAG11 of the object side surface of the first lens and the sagittal height SAG22 of the image side surface of the second lens satisfy: 0.30 < SAG11 / SAG22 ≤ 0.80; the distance EP12 from the image side surface of the first bearing element to the object side surface of the second bearing element along the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 0.50 < EP12 / CT2 < 0.

90.

5. The optical imaging lens according to claim 1, characterized in that, The central thickness of the second lens on the optical axis is the largest among all the lenses of the lens group, and the following conditions are satisfied among the central thickness CT2 of the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis: 1.1 < CT2 / (CT1+CT3) < 1.55; and the following condition is satisfied between the central thickness CT2 of the second lens on the optical axis and the inner diameter d2m of the image side surface of the second abutting element: 0.4 < CT2 / d2m < 0.

9. 6.The optical imaging lens according to claim 1, wherein, The on-axis distance TD from the object side surface of the first lens to the image side surface of the third lens is smaller than the height L of the lens barrel, and the following condition is satisfied among the on-axis distance TD from the object side surface of the first lens to the image side surface of the third lens, the height L of the lens barrel, and the sum ∑CT of the central thicknesses of the first lens, the second lens, and the third lens on the optical axis: 0.2 < (L-TD) / ∑CT < 1.45; and the following condition is satisfied among the distance EP01 in the direction of the optical axis from the object side end surface of the lens barrel to the object side surface of the first abutting element, the central thickness CT1 of the first lens on the optical axis, and the on-axis distance T12 from the image side surface of the first lens to the object side surface of the second lens: 1.25 ≤ (EP01-CT1-T12) / CT1 < 2.

55. 7.The optical imaging lens according to claim 1, wherein, The following condition is satisfied among the distance EP12 in the direction of the optical axis from the image side surface of the first abutting element to the object side surface of the second abutting element, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the image side surface of the second lens: 0.15 < EP12 / (R3-R4) < 0.

45. 8.The optical imaging lens according to claim 1, wherein, The following conditions are satisfied among the radius of curvature R1 of the object side surface of the first lens and the effective focal length f1 of the first lens: 0.45 < R1 / f1 < 0.80; among the sag SAG11 of the object side surface of the first lens and the central thickness CT1 of the first lens on the optical axis: -0.6 < SAG11 / CT1 < -0.3; and among the outer diameter D1s of the object side surface of the first abutting element and the inner diameter d1s of the object side surface of the first abutting element: 2.35 < (D1s-d1s) / d1s < 3.

05. 9.The optical imaging lens according to claim 1, wherein, The absolute value of the effective focal length of the second lens is the smallest among all the lenses of the lens group, and the following condition is satisfied among the inner diameter d0m of the image side end surface of the lens barrel, the outer diameter D2m of the image side surface of the second abutting element, and the inner diameter d2m of the image side surface of the second abutting element: 0.2 < (d0m-D2m) / (D2m-d2m) < 0.

85. 10.The optical imaging lens according to claim 1, wherein, The following condition is satisfied among the effective focal length f1 of the first lens and the effective focal length f2 of the second lens: -1.80 < f1 / f2 < -1.30; and the following condition is satisfied among the effective radius DT11 of the object side surface of the first lens, the effective radius DT22 of the image side surface of the second lens, and the inner diameter d1s of the object side surface of the first abutting element: |DT11-DT22| / d1s ≤ 0.

05. 11.The optical imaging lens according to claim 1, wherein, An effective radius DT32 of an image side surface of the third lens, an effective radius DT22 of an image side surface of the second lens, an effective radius DT11 of an object side surface of the first lens satisfy: -3 < (DT32-DT22) / (DT22-DT11) <-0.65; an inner diameter d2s of an object side surface of the second abutting element, an inner diameter d1s of an object side surface of the first abutting element satisfy: 1.2 < d2s / d1s < 2.1.

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