Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a spacing element group, the lens group and the spacing element group are arranged in the lens barrel, the lens group is composed of three lenses, and the three lenses are sequentially a first lens, a second lens and a third lens from the object side to the image side; in the first to third lenses, the refractive index of the third lens is the largest; the spacer element group includes a first spacer element interposed between the first lens and the second lens and in contact with an image-side surface portion of the first lens; wherein (D0s-d0s) / R1 is greater than or equal to-1.11 and less than or equal to-0.68; r2 / (D1s-d1s) is greater than or equal to-1.22 and less than or equal to-0.68. The three-piece type optical imaging lens solves the problems that in the prior art, a three-piece type optical imaging lens meets the appearance requirement, so that the front-end lens assembly is not stable, and internal reflection stray light is increased easily.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an optical imaging lens. Background Art

[0002] With the popularization of smart electronic devices and the continuous advancement of technology, optical under-screen fingerprint recognition technology has become an important means of securely unlocking smart electronic devices, and the optical imaging lens applied to optical under-screen fingerprint recognition has received increasing attention from users. The three-piece optical imaging lens is widely used in various electronic devices due to its high fingerprint recognition accuracy and strong adaptability.

[0003] At present, in order to control the appearance of the optical imaging lens to match the size of the mobile phone window, the three-piece optical imaging lens usually needs to control the front-end size of the optical imaging lens, and optimize the front-end size and aperture of the optical imaging lens to meet performance requirements. However, in this case, it is easy to affect the stable assembly of the front-end lens, and it is easy to cause internal reflection stray light in the front-end lens, which directly reduces the clarity and efficiency of fingerprint recognition by the optical imaging lens.

[0004] That is to say, the three-piece optical imaging lens in the prior art has the problem that meeting the appearance requirements may easily lead to unstable front-end lens assembly and increased internal reflection stray light. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem that the three-piece optical imaging lens in the prior art easily leads to unstable front lens assembly and increased internal reflection stray light in order to meet the appearance requirements.

[0006] To achieve the above-mentioned object, according to one aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group and a spacer element group arranged in the lens barrel, wherein the lens group consists of three lenses, and the three lenses are, from the object side to the image side, a first lens, a second lens and a third lens in order; among the first to third lenses, the refractive index of the third lens is the largest; the spacer element group comprises a first spacer element disposed between the first lens and the second lens and in contact with the image side surface portion of the first lens; wherein the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens satisfy the following relationship: -1.11≤(D0s-d0s) / R1≤-0.68; and the curvature radius R2 of the image side surface of the first lens, the outer diameter D1s of the object side surface of the first spacer element and the inner diameter d1s of the object side surface of the first spacer element satisfy the following relationship: -1.22≤R2 / (D1s-d1s)≤-0.68.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group and a spacer element group arranged in the lens barrel, wherein the lens group consists of three lenses, which are a first lens, a second lens and a third lens in order from the object side to the image side; among the first to third lenses, the third lens has the largest refractive index; the spacer element group comprises a first spacer element disposed between the first lens and the second lens and in contact with the image side surface portion of the first lens; wherein the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens satisfy the following relationship: -1.11≤(D0s-d0s) / R1≤-0.68; and the axial spacing distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element, the air spacing T12 from the first lens to the second lens on the optical axis of the optical imaging lens and the effective focal length f1 of the first lens satisfy the following relationship: -1.23≤(EP01+T12) / f1≤-0.83.

[0008] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group and a spacer element group arranged in the lens barrel, wherein the lens group consists of three lenses, which are a first lens, a second lens and a third lens in order from the object side to the image side; among the first to third lenses, the third lens has the largest refractive index; the spacer element group comprises a first spacer element disposed between the first lens and the second lens and partially in contact with the image side surface of the first lens; wherein the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens satisfy the following relationship: -1.11≤(D0s-d0s) / R1≤-0.68; and the axial spacing distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element, the air spacing T12 from the first lens to the second lens on the optical axis of the optical imaging lens and the inner diameter d1s of the object side surface of the first spacer element satisfy the following relationship: 0.42≤(T12+CP1) / d1s≤0.67.

[0009] Furthermore, the axial spacing distance EP01 from the object side end face of the lens barrel to the object side face of the first spacing element, the air spacing T12 from the first lens to the second lens on the optical axis of the optical imaging lens, and the effective focal length f1 of the first lens satisfy: -1.23≤(EP01+T12) / f1≤-0.83.

[0010] Furthermore, the spacer element group further includes a second spacer element disposed between the second lens and the third lens and partially in contact with the image side surface of the second lens, and the curvature radius R3 of the object side surface of the second lens, the curvature radius R4 of the image side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer element satisfy: 0.79 mm -1 ≤|R3 / R4| / d2s≤3.62mm -1 .

[0011] Furthermore, the spacer element group also includes a second spacer element placed between the second lens and the third lens and in contact with the image side portion of the second lens, and the air gap T23 between the second lens and the third lens on the optical axis of the optical imaging lens and the maximum axial thickness CP2 of the second spacer element satisfy: 4.91≤T23 / CP2≤9.14.

[0012] Furthermore, an axial spacing distance EP01 from the object side end face of the lens barrel to the object side face of the first spacing element, a maximum axial thickness CP1 of the first spacing element, and a center thickness CT1 of the first lens on the optical axis of the optical imaging lens satisfy: 1.62≤(EP01+CP1) / CT1≤2.70.

[0013] Furthermore, the spacer element group also includes a second spacer element placed between the second lens and the third lens and partially in contact with the image side surface of the second lens, and the air gap T12 from the first lens to the second lens on the optical axis of the optical imaging lens, the air gap T23 from the second lens to the third lens on the optical axis, and the axial spacing distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element satisfy the following: 1.26≤(T12+T23) / EP12≤1.82.

[0014] Furthermore, the spacer element group also includes a second spacer element placed between the second lens and the third lens and partially in contact with the image side surface of the second lens, and the outer diameter D2m of the image side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element and the curvature radius R6 of the image side surface of the third lens satisfy: -10.09≤(D2m-d2m) / R6≤-4.98.

[0015] Further, a center thickness CT3 of the third lens on the optical axis of the optical imaging lens and a maximum axial height L of the lens barrel satisfy: 5.88≤L / CT3≤7.68.

[0016] Furthermore, the spacer element group also includes a second spacer element placed between the second lens and the third lens and in contact with the image side portion of the second lens, and the combined focal length f23 of the second lens and the third lens, the maximum axial thickness CP2 of the second spacer element and the air gap T23 from the second lens to the third lens on the optical axis of the optical imaging lens satisfy: 2.56≤f23 / (CP2+T23)≤3.20.

[0017] Furthermore, the spacer element group also includes a second spacer element placed between the second lens and the third lens and partially in contact with the image side surface of the second lens, and the combined focal length f12 of the first lens and the second lens, the axial spacing distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element, and the axial spacing distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element satisfy: -1.47≤f12 / (EP01+EP12)≤-0.74.

[0018] Furthermore, the first lens has negative optical power, the object side surface of the first lens is concave, and the image side surface of the first lens is convex; the second lens has negative optical power; the third lens has positive optical power, and the image side surface of the third lens is convex.

[0019] By applying the technical solution of the present invention, the optical imaging lens of the present application is composed of a lens barrel, three lenses and a spacing element arranged in the lens barrel. By reasonably arranging the positions of the three lenses and the first spacing element, and setting the optical imaging lens to satisfy -1.11≤(D0s-d0s) / R1≤-0.68, the inner diameter of the object side end face of the lens barrel is constrained, the aperture of the lens barrel can be controlled, and then the amount of light entering the optical imaging lens can be controlled; the outer diameter of the object side end face of the lens barrel can be controlled to control the size of the head of the lens barrel; by optimizing the head size and the aperture of the optical imaging lens, the appearance of the optical imaging lens can be controlled to match the window size of the electronic device, because when the head size of the optical imaging lens is slightly larger than the window size, the overall appearance is optimal; when the head size of the optical imaging lens is larger than the window size, the overall appearance is second; when the head size of the optical imaging lens is smaller than the window size, the overall appearance is the worst. Therefore, such a setting can ensure the appearance while ensuring the fingerprint recognition performance of the optical imaging lens. However, in this case, it is easy to affect the stable assembly of the front-end lens, especially the first lens, and it is easy to cause the first lens to have internal reflected stray light, which reduces the clarity and efficiency of the optical imaging lens in identifying fingerprints. Therefore, the present application constrains -1.22≤R2 / (D1s-d1s)≤-0.68, constrains the radius of curvature of the image side of the first lens and the inner and outer diameter difference of the object side of the first spacing element, and can ensure that the bearing contact area between the first spacing element and the first lens is large, thereby improving the assembly stability of the first lens and the first spacing element in the lens barrel, and then improving the assembly stability of the front-end structure of the optical imaging lens. At the same time, the inner diameter of the object side of the first spacing element can be controlled to be in a smaller range, so that the first spacing element can effectively intercept stray light, reduce the internal reflected stray light of the first lens, and effectively improve the clarity and efficiency of the optical imaging lens in identifying fingerprints. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 A dimensioning diagram of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0022] Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1-1 of the present invention is shown;

[0023] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 1-2 of the present invention is shown;

[0024] Figures 4 to 7 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the first embodiment of the present invention are respectively shown;

[0025] Figure 8 A schematic structural diagram of an optical imaging lens according to Embodiment 2-1 of the present invention is shown;

[0026] Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 2-2 of the present invention is shown;

[0027] Figures 10 to 13 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the second embodiment of the present invention are respectively shown;

[0028] Fig.14 A schematic structural diagram of an optical imaging lens according to Embodiment 3-1 of the present invention is shown;

[0029] Fig.15 A schematic structural diagram of an optical imaging lens according to Embodiment 3-2 of the present invention is shown;

[0030] Figures 16 to 19 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the third embodiment of the present invention are shown;

[0031] Fig. 20 A schematic structural diagram of an optical imaging lens according to Embodiment 4-1 of the present invention is shown;

[0032] Fig.21 A schematic structural diagram of an optical imaging lens according to Embodiment 4-2 of the present invention is shown;

[0033] Figure 22 to Figure 25 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the fourth embodiment of the present invention are shown;

[0034] Fig.26 The stray light energy distribution diagram is shown when the optical imaging lens of Solution 1 of the present application satisfies (D0s-d0s) / R1=-0.82 and R2 / (D1s-d1s)=-1.19;

[0035] Fig. 27 The stray light energy distribution diagram of the optical imaging lens of Comparative Example 1 when (D0s-d0s) / R1=-0.82 and R2 / (D1s-d1s)=-1.60 is shown;

[0036] Fig.28 The stray light energy distribution diagram of the optical imaging lens of Comparative Example 2 is shown when (D0s-d0s) / R1=-0.82 and R2 / (D1s-d1s)=-0.15.

[0037] The above drawings include the following reference numerals:

[0038] P0, lens barrel; E1, first lens; P1, first spacing element; E2, second lens; P2, second spacing element; E3, third lens; E4, electronic photosensitive element; 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 electronic photosensitive element; S8, image side surface of the electronic photosensitive element. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0041] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0042] It should be noted that in this specification, the expressions of 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 teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0043] In the 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 shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0044] In this article, the paraxial area refers to the area 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 area; 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 area. The judgment of the surface type in the paraxial area can be based on the judgment method of the general knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the concave and convex. For the object side, 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; for the image side, 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 the present application, the left side is the object side and the right side is the image side.

[0045] There are two main implementation methods of under-screen fingerprint technology: ultrasonic and optical. Ultrasonic under-screen fingerprint technology uses the penetration of ultrasound to depict the fingerprint map by analyzing the difference in reflection of ultrasound on the fingerprint. The optical under-screen fingerprint technology uses the self-luminous properties of the OLED screen to capture the light reflected by the fingerprint through the electronic photosensitive element under the screen to achieve recognition. It has the characteristics of high recognition accuracy, wide range of applications, and relatively low cost. The present invention aims to provide an optical imaging lens for optical under-screen fingerprints composed of three lenses. In other words, the optical imaging lens of the present invention is used for under-screen fingerprint recognition.

[0046] In order to solve the problem that the three-piece optical imaging lens in the prior art may easily lead to unstable front lens assembly and increased internal reflection stray light in order to meet the appearance requirements, the present invention provides an optical imaging lens.

[0047] like Figures 1 to 26As shown, in an optional embodiment of the present application, the optical imaging lens includes a lens barrel and a lens group and a spacer element group arranged in the lens barrel, the lens group is composed of three lenses, and the three lenses are a first lens, a second lens and a third lens in order from the object side to the image side; among the first to third lenses, the refractive index of the third lens is the largest; the spacer element group includes a first spacer element placed between the first lens and the second lens and in contact with the image side surface portion of the first lens; wherein, the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens satisfy: -1.11≤(D0s-d0s) / R1≤-0.68; the curvature radius R2 of the image side surface of the first lens, the outer diameter D1s of the object side surface of the first spacer element and the inner diameter d1s of the object side surface of the first spacer element satisfy: -1.22≤R2 / (D1s-d1s)≤-0.68.

[0048] The optical imaging lens of the present application is composed of a lens barrel, three lenses and a spacing element arranged in the lens barrel. By reasonably arranging the positions of the three lenses and the first spacing element, and setting the optical imaging lens to satisfy -1.11≤(D0s-d0s) / R1≤-0.68, the inner diameter of the object side end face of the lens barrel is constrained, the aperture of the lens barrel can be controlled, and then the amount of light entering the optical imaging lens can be controlled; the outer diameter of the object side end face of the lens barrel can be controlled to control the size of the head of the lens barrel; by optimizing the head size and the aperture of the optical imaging lens, the appearance of the optical imaging lens can be controlled to match the window size of the electronic device, because when the head size of the optical imaging lens is slightly larger than the window size, the overall appearance is optimal; when the head size of the optical imaging lens is larger than the window size, the overall appearance is second; when the head size of the optical imaging lens is smaller than the window size, the overall appearance is the worst. Therefore, such a setting can ensure the appearance while ensuring the fingerprint recognition performance of the optical imaging lens. However, in this case, it is easy to affect the stable assembly of the front-end lens, especially the first lens, and it is easy to cause the first lens to have internal reflected stray light, which reduces the clarity and efficiency of the optical imaging lens in identifying fingerprints. Therefore, the present application constrains -1.22≤R2 / (D1s-d1s)≤-0.68, constrains the radius of curvature of the image side of the first lens and the inner and outer diameter difference of the object side of the first spacing element, and can ensure that the bearing contact area between the first spacing element and the first lens is large, thereby improving the assembly stability of the first lens and the first spacing element in the lens barrel, and then improving the assembly stability of the front-end structure of the optical imaging lens. At the same time, the inner diameter of the object side of the first spacing element can be controlled to be in a smaller range, so that the first spacing element can effectively intercept stray light, reduce the internal reflected stray light of the first lens, and effectively improve the clarity and efficiency of the optical imaging lens in identifying fingerprints.

[0049] In addition, refer to the following table 1, Figure 26 to Figure 28As shown, under the premise that the optical imaging lens satisfies -1.11≤(D0s-d0s) / R1≤-0.68, for example, (D0s-d0s) / R1=-0.82, Fig.26 The stray light energy distribution diagram is shown when the optical imaging lens of Scheme 1 of the present application satisfies (D0s-d0s) / R1=-0.82 and R2 / (D1s-d1s)=-1.19; Fig. 27 The stray light energy distribution diagram of the optical imaging lens of Comparative Example 1 is shown when (D0s-d0s) / R1=-0.82 and R2 / (D1s-d1s)=-1.60; Fig.28 The stray light energy distribution diagram of the optical imaging lens of Comparative Example 2 is shown when (D0s-d0s) / R1=-0.82 and R2 / (D1s-d1s)=-0.15.

[0050] Depend on Figure 26 to Figure 28 It can be seen that when the optical imaging lens satisfies R2 / (D1s-d1s)=-1.19, the bearing contact area between the first spacer element and the first lens is larger, the assembly stability of the first lens and the first spacer element is better, the front end assembly stability of the optical imaging lens is better, and at the same time, the inner diameter of the object side of the first spacer element is smaller, the internal reflection stray light of the first lens is relatively slight, and the maximum energy intensity of the stray light is about 0.000002875lm / mm 2 , the total energy intensity is about 0.000001528lm, which is a good performance. When the optical imaging lens satisfies R2 / (D1s-d1s)=-1.60, the bearing contact area between the first spacer element and the first lens is large, and the assembly stability of the first lens and the first spacer element is good. However, the inner diameter of the object side of the first spacer element is large, and the internal reflection stray light of the first lens is more serious. The maximum energy intensity of the stray light is about 0.000197675lm / mm 2 , the total energy intensity is about 0.0000643128lm, and the overall performance is poor. When the optical imaging lens satisfies R2 / (D1s-d1s)=-0.15, the bearing contact area between the first spacing element and the first lens is small, the assembly stability is poor, and the inner diameter of the object side of the first spacing element is small. The internal reflection stray light of the first lens is more serious, and the maximum energy intensity of the stray light is about 0.00023725lm / mm 2 , the total energy intensity is about 0.000065651lm, and the overall performance is poor.

[0051] It can be seen that when -1.11≤(D0s-d0s) / R1≤-0.68 is satisfied and R2 / (D1s-d1s) is controlled to be within the range of -1.22 to -0.68, the assembly stability of the first lens and the first spacing element in the lens barrel is optimal, the front end assembly stability of the optical imaging lens is good, and the internal reflection stray light of the first lens is less, and the performance is optimal. Therefore, by constraining -1.11≤(D0s-d0s) / R1≤-0.68 and -1.22≤R2 / (D1s-d1s)≤-0.68, the present application can ensure that the bearing contact area between the first spacing element and the first lens is larger, thereby improving the assembly stability of the first lens and the first spacing element in the lens barrel, and then improving the assembly stability of the front end structure of the optical imaging lens. At the same time, the inner diameter of the object side of the first spacing element can be controlled to be within a smaller range, reducing the internal reflection stray light of the first lens, and effectively improving the clarity and efficiency of fingerprint recognition of the optical imaging lens.

[0052] Table 1

[0053]

[0054]

[0055] In this embodiment, 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 surface portion of the second lens.

[0056] In this embodiment, the axial spacing distance EP01 from the object side end face of the lens barrel to the object side face of the first spacing element, the air spacing T12 from the first lens to the second lens on the optical axis of the optical imaging lens and the effective focal length f1 of the first lens satisfy: -1.23≤(EP01+T12) / f1≤-0.83. By controlling this conditional expression, it can be ensured that the projections of the contact surface between the first lens and the lens barrel and the contact surface between the first lens and the first spacing element on each other at least partially overlap, and it is ensured that the overlapping area of ​​the projections of the two contact surfaces on each other is large, effectively improving the assembly stability of the front end structure of the optical imaging lens. In addition, by controlling this conditional expression, it is possible to control the interception of the outgoing light of the first lens by the first spacing element, and on the basis of ensuring the relative illumination of the optical imaging lens, ensure that the first spacing element can effectively intercept the edge stray light, thereby achieving the purpose of improving the stray light, and further ensuring that the imaging quality of the optical imaging lens is high.

[0057] In this embodiment, the curvature radius R3 of the object side surface of the second lens, the curvature radius R4 of the image side surface of the second lens, and the inner diameter d2s of the object side surface of the second spacer element satisfy: 0.79 mm -1 ≤|R3 / R4| / d2s≤3.62mm -1By controlling the conditional expression, the surface shapes of the object side surface of the second lens and the image side surface of the second lens can be optimized, thereby helping to reduce the generation of spherical aberration and astigmatism of the optical imaging lens. At the same time, the inner diameter of the object side surface of the second spacing element can be constrained to ensure that the inner diameter of the object side surface of the second spacing element is close to the optical outer diameter of the image side surface of the second lens, and the inner diameter of the image side surface of the second spacing element is close to the optical outer diameter of the object side surface of the third lens, which helps to improve the effect of the second spacing element in intercepting stray light between the second lens and the third lens.

[0058] In this embodiment, the air interval T23 between the second lens and the third lens on the optical axis of the optical imaging lens and the maximum axial thickness CP2 of the second spacer element satisfy: 4.91≤T23 / CP2≤9.14. By controlling this conditional expression, the air interval between the second lens and the third lens on the optical axis and the maximum axial thickness of the second spacer element can be controlled, the surface shapes of the image side surface of the second lens and the object side surface of the third lens can be optimized, and the internal reflected stray light of the second lens and the third lens can be reduced, which helps to improve the imaging quality of the optical imaging lens.

[0059] In this embodiment, the axial spacing distance EP01 from the object side end face of the lens barrel to the object side face of the first spacing element, the maximum axial thickness CP1 of the first spacing element and the center thickness CT1 of the first lens on the optical axis of the optical imaging lens satisfy: 1.62≤(EP01+CP1) / CT1≤2.70. By controlling this conditional expression, it is ensured that the ratio of the axial spacing distance from the object side end face of the lens barrel to the image side face of the first spacing element to the center thickness of the first lens on the optical axis is appropriate, which is beneficial to improving the molding stability of the first lens and facilitating the molding of the first lens; at the same time, it can also ensure that the front end of the lens barrel and the bearing surface of the first lens, and the bearing surface of the first lens and the first spacing element at least partially overlap in the projection of each other, and ensure that the overlapping area of ​​the projections of the two bearing surfaces on each other is large, so as to effectively improve the front end assembly stability of the optical imaging lens.

[0060] In this embodiment, the air interval T12 between the first lens and the second lens on the optical axis of the optical imaging lens, the air interval T23 between the second lens and the third lens on the optical axis, and the axial spacing distance EP12 from the image side surface of the first spacing element to the object side surface of the second spacing element satisfy: 1.26≤(T12+T23) / EP12≤1.82. By controlling this conditional expression, the positions of the first lens, the second lens, and the third lens can be accurately limited, which is beneficial to improving the compactness of the optical imaging lens structure, and at the same time helps to correct the off-axis aberration of the optical imaging lens, thereby improving the imaging quality of the optical imaging lens.

[0061] In this embodiment, the outer diameter D2m of the image side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element, and the curvature radius R6 of the image side surface of the third lens satisfy: -10.09≤(D2m-d2m) / R6≤-4.98. By controlling this conditional expression, the ratio between the inner and outer diameter difference of the image side surface of the second spacer element and the curvature radius of the image side surface of the third lens can be controlled, thereby ensuring that the second spacer element can appropriately block the edge stray light of the second lens, reduce the possibility of stray light being transmitted to the rear, and at the same time do not affect the stable passage of imaging light, thereby improving the imaging quality of the optical imaging lens.

[0062] In this embodiment, the center thickness CT3 of the third lens on the optical axis of the optical imaging lens and the maximum axial height L of the lens barrel satisfy: 5.88≤L / CT3≤7.68. The maximum axial height L of the lens barrel is the maximum axial distance from the object side end face of the lens barrel to the image side end face of the lens barrel. By controlling this conditional expression, the ratio of the center thickness of the third lens on the optical axis to the maximum axial height of the lens barrel can be controlled within a certain range, which helps to make the thickness distribution of the third lens more uniform, ensure the assembly stability of the third lens, and balance the aberrations of the optical imaging lens, effectively shortening the total length of the optical imaging lens in the optical axis direction.

[0063] In this embodiment, the combined focal length f23 of the second lens and the third lens, the maximum axial thickness CP2 of the second spacing element, and the air interval T23 from the second lens to the third lens on the optical axis of the optical imaging lens satisfy: 2.56≤f23 / (CP2+T23)≤3.20. By controlling this conditional expression, the optical power and surface shape of the second lens and the third lens can be controlled, so that the thickness distribution of the second lens and the third lens is uniform, the processability and structural strength of the second lens and the third lens are guaranteed, and it is also beneficial to balance the aberrations generated at the front end and the rear end of the optical imaging lens, and shorten the total length of the optical imaging lens in the optical axis direction.

[0064] In this embodiment, the combined focal length f12 of the first lens and the second lens, the axial spacing distance EP01 from the object side end face of the lens barrel to the object side face of the first spacing element, and the axial spacing distance EP12 from the image side face of the first spacing element to the object side face of the second spacing element satisfy: -1.47≤f12 / (EP01+EP12)≤-0.74. By controlling this conditional expression, the range of the combined focal length of the first lens and the second lens can be constrained, which is conducive to reasonably controlling the optical power contribution range of the first lens and the second lens, and then controlling the contribution amount of the negative spherical aberration of the first lens and the second lens, so that it can reasonably balance the positive spherical aberration generated by the third lens with positive optical power, and at the same time, it is also helpful to improve the thickness uniformity of the first lens and the second lens, thereby ensuring the molding of the first lens and the second lens.

[0065] In this embodiment, the first lens has negative optical power, the object side surface of the first lens is concave, and the image side surface of the first lens is convex; the second lens has negative optical power; the third lens has positive optical power, and the image side surface of the third lens is convex. The first lens and the second lens have negative optical power, and the third lens has positive optical power, which can ensure the reasonable order of light first diverging and then converging in the lens group, optimize the propagation path of light, reduce spherical aberration, improve the imaging quality of the optical imaging lens, and meet the miniaturization requirements of the three-piece optical imaging lens. The surface shape of the lens set as above can ensure that the light is reasonably refracted and reflected in the optical imaging lens, optimize the focusing and divergence of light, and improve the imaging clarity of the optical imaging lens.

[0066] Optionally, the optical imaging lens in the embodiments of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. In the process of simulation using the above software and / or tools, the surface profile of each lens can be simulated and appropriately adjusted according to the surface profile provided by the software and / or tool used.

[0067] In this embodiment, each lens can be selected as a trimmed lens. The outer diameter surface of the trimmed lens has a trimmed structure and a non-trimmed structure, and the outer diameter of the trimmed structure is smaller than the outer diameter of the non-trimmed structure. The outer diameter of the trimmed lens usually refers to the outer diameter of the non-trimmed structure.

[0068] In this embodiment, each spacer element can be selected as a trimming spacer element. The outer annular surface of the trimming spacer element has a trimming portion and a non-trimming portion, and the outer diameter of the trimming portion is smaller than the outer diameter of the non-trimming portion. The outer diameter of the trimming spacer element usually refers to the maximum outer diameter of the non-trimming portion.

[0069] 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 is composed of three lenses, and the three lenses are a first lens, a second lens and a third lens in order from the object side to the image side; among the first to third lenses, the refractive index of the third lens is the largest; the spacer element group includes a first spacer element placed between the first lens and the second lens and in contact with the image side surface portion of the first lens; wherein the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens satisfy: -1.11≤(D0s-d0s) / R1≤-0.68; the axial spacing distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element, the air spacing T12 from the first lens to the second lens on the optical axis of the optical imaging lens and the effective focal length f1 of the first lens satisfy: -1.23≤(EP01+T12) / f1≤-0.83.

[0070] The optical imaging lens of the present application is composed of a lens barrel, three lenses and a spacing element arranged in the lens barrel. By reasonably arranging the positions of the three lenses and the first spacing element, and setting the optical imaging lens to satisfy -1.11≤(D0s-d0s) / R1≤-0.68, the inner diameter of the object side end face of the lens barrel is constrained, the aperture of the lens barrel can be controlled, and then the amount of light entering the optical imaging lens can be controlled; the outer diameter of the object side end face of the lens barrel can be controlled to control the size of the head of the lens barrel; by optimizing the head size and the aperture of the optical imaging lens, the appearance of the optical imaging lens can be controlled to match the window size of the electronic device, because when the head size of the optical imaging lens is slightly larger than the window size, the overall appearance is optimal; when the head size of the optical imaging lens is larger than the window size, the overall appearance is second; when the head size of the optical imaging lens is smaller than the window size, the overall appearance is the worst. Therefore, such a setting can ensure the appearance while ensuring the fingerprint recognition performance of the optical imaging lens. However, in this case, it is easy to affect the stable assembly of the front-end lens, especially the first lens, and it is easy to cause the first lens to have internally reflected stray light, which reduces the clarity and efficiency of fingerprint recognition of the optical imaging lens. Therefore, the present application can ensure that the projections of the contact surface between the first lens and the lens barrel and the contact surface between the first lens and the first spacing element on each other at least partially overlap by constraining -1.23≤(EP01+T12) / f1≤-0.83, and ensure that the overlapping area of ​​the projections of the two contact surfaces on each other is large, thereby effectively improving the assembly stability of the front-end structure of the optical imaging lens. In addition, by controlling this conditional expression, it is possible to control the interception of the outgoing light of the first lens by the first spacing element, and on the basis of ensuring the relative illumination of the optical imaging lens, ensure that the first spacing element can effectively intercept the edge stray light, thereby achieving the purpose of improving the stray light, and further ensuring that the imaging quality of the optical imaging lens is high.

[0071] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0072] 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 is composed of three lenses, and the three lenses are a first lens, a second lens and a third lens in order from the object side to the image side; among the first to third lenses, the refractive index of the third lens is the largest; the spacer element group includes a first spacer element placed between the first lens and the second lens and in contact with the image side surface portion of the first lens; wherein the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens satisfy: -1.11≤(D0s-d0s) / R1≤-0.68; the axial spacing distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element, the air spacing T12 from the first lens to the second lens on the optical axis of the optical imaging lens and the inner diameter d1s of the object side surface of the first spacer element satisfy: 0.42≤(T12+CP1) / d1s≤0.67.

[0073] The optical imaging lens of the present application is composed of a lens barrel, three lenses and a spacing element arranged in the lens barrel. By reasonably arranging the positions of the three lenses and the first spacing element, and setting the optical imaging lens to satisfy -1.11≤(D0s-d0s) / R1≤-0.68, the inner diameter of the object side end face of the lens barrel is constrained, the aperture of the lens barrel can be controlled, and then the amount of light entering the optical imaging lens can be controlled; the outer diameter of the object side end face of the lens barrel can be controlled to control the size of the head of the lens barrel; by optimizing the head size and the aperture of the optical imaging lens, the appearance of the optical imaging lens can be controlled to match the window size of the electronic device, because when the head size of the optical imaging lens is slightly larger than the window size, the overall appearance is optimal; when the head size of the optical imaging lens is larger than the window size, the overall appearance is second; when the head size of the optical imaging lens is smaller than the window size, the overall appearance is the worst. Therefore, such a setting can ensure the appearance while ensuring the fingerprint recognition performance of the optical imaging lens. However, in this case, it is easy to affect the stable assembly of the front lens, especially the first lens, and it is easy to cause internal reflection stray light in the first lens, reducing the clarity and efficiency of fingerprint recognition of the optical imaging lens. Therefore, the present application can optimize the relative position of the first lens and the second lens by constraining 0.42≤(T12+CP1) / d1s≤0.67, improve the assembly accuracy and assembly stability of the front structure of the optical imaging lens, and also help reduce the reflection of stray light between the first lens and the second lens, reduce the generation of internal reflection stray light of the first lens and the second lens, and ensure that the first spacing element can effectively intercept edge stray light, thereby improving the clarity and contrast of imaging.

[0074] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0075] Optionally, the optical imaging lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0076] The optical imaging lens in the present application may use multiple lenses, such as the three lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0077] 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 three lenses are described as an example in the embodiments, the optical imaging lens is not limited to including three lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0078] Figure 1 A schematic diagram of the dimensions of an optical imaging lens of the present application is shown. Figure 1 Parameters such as d0s, D0s, d1s, D1s, d2s, d2m, D2m, EP01, CP1, EP12, CP2 and L are indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the optical imaging lens and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0079] The following further describes examples of specific surface shapes and parameters of the optical imaging lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0080] It should be noted that in the following embodiment 1, there are two examples of embodiment 1-1 and embodiment 1-2, in embodiment 2, there are two examples of embodiment 2-1 and embodiment 2-2, in embodiment 3, there are two examples of embodiment 3-1 and embodiment 3-2, and in embodiment 4, there are two examples of embodiment 4-1 and embodiment 4-2. In the two examples of the same embodiment, the parameters such as the radius of curvature, center thickness, and the spacing distance between the lenses and the coefficients of high-order terms of the optical imaging lens are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel and each spacing element are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[0081] It should be noted that any one of the following embodiments 1 to 4 is applicable to all implementation methods of the present application.

[0082] Embodiment 1

[0083] like Figures 2 to 7 As shown, the optical imaging lens of the first embodiment is described. Figure 2 FIG. 1 is a schematic diagram showing the structure of the optical imaging lens of Example 1-1. Figure 3 A schematic structural diagram of the optical imaging lens of Embodiment 1-2 is shown.

[0084] like Figures 2 to 3 As shown, the optical imaging lens comprises a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, and an electronic photosensitive element E4 which are sequentially arranged in the lens barrel P0 from the object side to the image side. The electronic photosensitive element E4 has an object side surface S7 of the electronic photosensitive element and an image side surface S8 of the electronic photosensitive element.

[0085] like Figure 2 , which is a schematic diagram of the structure of the optical imaging lens of Example 1-1. In this example, 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 S5 of the third lens, respectively.

[0086] like Figure 3 , which is a schematic diagram of the structure of the optical imaging lens of Example 1-2. The supporting and abutting manner of each spacing element in this example is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0087] In summary, the structural parameters of the optical imaging lens of Example 1 in Example 1-1 and Example 1-2 are shown in Table 2.

[0088] Table 2

[0089] Parameters / Examples 1-1 1-2 d0s(mm) 3.004 3.005 D0s(mm) 3.396 3.396 d1s(mm) 0.980 0.980 D1s(mm) 2.780 1.980 d2s(mm) 0.672 0.672 d2m(mm) 0.672 0.672 D2m(mm) 2.860 2.860 EP01(mm) 0.606 0.606 CP1(mm) 0.012 0.022 EP12(mm) 0.443 0.433 CP2(mm) 0.019 0.019 L(mm) 2.465 2.465

[0090] In the first embodiment, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a convex surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface.

[0091] In Example 1, the effective focal length f1 of the first lens is -1.00 mm, the effective focal length f2 of the second lens is -423.32 mm, the effective focal length f3 of the third lens is 0.57 mm, the combined focal length f12 of the first lens and the second lens is -0.99 mm, and the combined focal length f23 of the second lens and the third lens is 0.57 mm.

[0092] Table 3 shows the basic structural parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0093] Table 3

[0094]

[0095] In the first embodiment, the object side surface and the image side surface of the first lens E1 to the third lens E3 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0096]

[0097] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the direction of the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in the above Table 3; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 4 gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 and A28 that can be used for each aspheric lens surface S1-S6 in Example 1.

[0098] Table 4

[0099]

[0100]

[0101] Figure 4 The axial chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 5 The astigmatism curve of the optical imaging lens of the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 6 The distortion curve of the optical imaging lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figure 7 The magnification chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0102] according to Figures 4 to 7It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0103] Embodiment 2

[0104] like Figures 8 to 13 As shown, the optical imaging lens of the second embodiment is described. Figure 8 FIG. 2 shows a schematic structural diagram of an optical imaging lens of Example 2-1. Fig. 9 A schematic structural diagram of the optical imaging lens of Example 2-2 is shown.

[0105] like Figures 8 to 9 As shown, the optical imaging lens comprises a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, and an electronic photosensitive element E4 which are sequentially arranged in the lens barrel P0 from the object side to the image side. The electronic photosensitive element E4 has an object side surface S7 of the electronic photosensitive element and an image side surface S8 of the electronic photosensitive element.

[0106] like Figure 8 , which is a schematic diagram of the structure of the optical imaging lens of Example 2-1. In this example, 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 S5 of the third lens, respectively.

[0107] like Fig. 9 , which is a schematic diagram of the structure of the optical imaging lens of Example 2-2. The supporting and abutting manner of each spacing element in this example is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0108] In summary, the structural parameters of the optical imaging lens of Example 2 in Example 2-1 and Example 2-2 are shown in Table 5.

[0109] Table 5

[0110]

[0111]

[0112] In the second embodiment, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a convex surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface.

[0113] In Example 2, the effective focal length f1 of the first lens is -1.15 mm, the effective focal length f2 of the second lens is -11.25 mm, the effective focal length f3 of the third lens is 0.57 mm, the combined focal length f12 of the first lens and the second lens is -0.97 mm, and the combined focal length f23 of the second lens and the third lens is 0.58 mm.

[0114] Table 6 shows a basic structural parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0115] Table 6

[0116]

[0117] Table 7 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 and A28 that can be used for the aspheric mirror surfaces S1-S6 in Example 2. The surface shape of each aspheric lens is defined according to formula (1) in Example 1.

[0118] Table 7

[0119]

[0120]

[0121] Fig.10 The axial chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.11 The astigmatism curve of the optical imaging lens of the second embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.12 The distortion curve of the optical imaging lens of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.13 The magnification chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0122] according to Figures 10 to 13 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0123] Embodiment 3

[0124] like Figures 14 to 19 As shown, the optical imaging lens of embodiment 3 is described. Fig.14 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-1. Fig.15 A schematic structural diagram of the optical imaging lens of Example 3-2 is shown.

[0125] like Figure 14 to Figure 15 As shown, the optical imaging lens comprises a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, and an electronic photosensitive element E4 which are sequentially arranged in the lens barrel P0 from the object side to the image side. The electronic photosensitive element E4 has an object side surface S7 of the electronic photosensitive element and an image side surface S8 of the electronic photosensitive element.

[0126] like Fig.14 , which is a schematic diagram of the structure of the optical imaging lens of Example 3-1. In this example, 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 S5 of the third lens, respectively.

[0127] like Fig.15 , which is a schematic diagram of the structure of the optical imaging lens of Example 3-2. The supporting and abutting manner of each spacing element in this example is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0128] In summary, the structural parameters of the optical imaging lens of Example 3 in Example 3-1 and Example 3-2 are shown in Table 8.

[0129] Table 8

[0130] Parameters / Examples 3-1 3-2 d0s(mm) 4.005 4.005 D0s(mm) 4.381 4.381 d1s(mm) 1.093 1.093 D1s(mm) 2.980 3.780 d2s(mm) 0.634 0.634 d2m(mm) 0.634 0.634 D2m(mm) 3.040 3.860 EP01(mm) 0.919 0.919 CP1(mm) 0.020 0.012 EP12(mm) 0.528 0.536 CP2(mm) 0.030 0.030 L(mm) 2.794 2.794

[0131] In the third embodiment, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a convex surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface.

[0132] In Example 3, the effective focal length f1 of the first lens is -1.15 mm, the effective focal length f2 of the second lens is -73.62 mm, the effective focal length f3 of the third lens is 0.59 mm, the combined focal length f12 of the first lens and the second lens is -1.12 mm, and the combined focal length f23 of the second lens and the third lens is 0.59 mm.

[0133] Table 9 shows a basic structural parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters.

[0134] Table 9

[0135]

[0136] Table 10 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 and A28 that can be used for the aspheric mirror surfaces S1-S6 in Example 3. The surface shape of each aspheric lens is defined according to formula (1) in Example 1.

[0137] Table 10

[0138]

[0139] Fig.16 The axial chromatic aberration curve of the optical imaging lens of the third embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.17 The astigmatism curve of the optical imaging lens of the third embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.18 The distortion curve of the optical imaging lens of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.19 The magnification chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0140] according to Figures 16 to 19 It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0141] Embodiment 4

[0142] like Figure 20 to Figure 25 As shown, the optical imaging lens of Example 4 is described. Fig. 20 FIG. 4 is a schematic diagram showing the structure of the optical imaging lens of Example 4-1. Fig.21 A schematic structural diagram of the optical imaging lens of Example 4-2 is shown.

[0143] like Figure 20 to Figure 21 As shown, the optical imaging lens comprises a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, and an electronic photosensitive element E4 which are sequentially arranged in the lens barrel P0 from the object side to the image side. The electronic photosensitive element E4 has an object side surface S7 of the electronic photosensitive element and an image side surface S8 of the electronic photosensitive element.

[0144] like Fig. 20 , which is a schematic diagram of the structure of the optical imaging lens of Example 4-1. In this example, 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 S5 of the third lens, respectively.

[0145] like Fig.21 , which is a schematic diagram of the structure of the optical imaging lens of Example 4-2. The supporting and abutting manner of each spacing element in this example is the same as that of Example 4-1, and the relevant description in Example 4-1 may be referred to, and will not be repeated here.

[0146] In summary, the structural parameters of the optical imaging lens of Example 4 in Example 4-1 and Example 4-2 are shown in Table 11.

[0147] Table 11

[0148] Parameters / Examples 4-1 4-2 d0s(mm) 3.705 3.705 D0s(mm) 4.081 4.081 d1s(mm) 1.249 1.249 D1s(mm) 2.680 2.623 d2s(mm) 0.620 0.620 d2m(mm) 0.620 0.620 D2m(mm) 2.740 3.560 EP01(mm) 0.769 0.769 CP1(mm) 0.020 0.020 EP12(mm) 0.528 0.528 CP2(mm) 0.030 0.030 L(mm) 2.338 2.338

[0149] In the fourth embodiment, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a convex surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. The object side surface S5 of the third lens is a concave surface, and the image side surface S6 of the third lens is a convex surface.

[0150] In Example 4, the effective focal length f1 of the first lens is -1.90 mm, the effective focal length f2 of the second lens is -94.56 mm, the effective focal length f3 of the third lens is 0.53 mm, the combined focal length f12 of the first lens and the second lens is -1.91 mm, and the combined focal length f23 of the second lens and the third lens is 0.51 mm.

[0151] Table 12 shows a basic structural parameter table of the optical imaging lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0152] Table 12

[0153]

[0154] Table 13 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 and A28 that can be used for the aspheric mirror surfaces S1-S6 in Example 4. The surface shape of each aspheric lens is defined according to formula (1) in Example 1.

[0155] Table 13

[0156]

[0157] Fig. 22 The axial chromatic aberration curve of the optical imaging lens of the fourth embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.23 The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.24The distortion curve of the optical imaging lens of the fourth embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.25 The magnification chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0158] according to Figure 22 to Figure 25 It can be seen that the optical imaging lens provided in the fourth embodiment can achieve good imaging quality.

[0159] In summary, Embodiments 1 to 4 respectively satisfy the relationships shown in Table 14.

[0160] Table 14

[0161] Conditional / Example 1-1 1-2 2-1 2-2 3-1 3-2 4-1 4-2 (D0s-d0s) / R1 -1.11 -1.11 -0.93 -0.93 -0.82 -0.82 -0.68 -0.68 R2 / (D1s-d1s) -0.68 -1.22 -0.68 -0.68 -1.19 -0.83 -1.09 -1.14 (EP01+T12) / f1 -1.01 -1.01 -1.15 -1.15 -1.23 -1.23 -0.83 -0.83 |R3 / R4| / d2s 1.56 1.56 3.62 3.62 0.79 0.79 1.50 1.50 T23 / CP2 8.42 8.42 6.09 9.14 6.68 6.68 4.91 4.91 (EP01+CP1) / CT1 2.65 2.70 2.33 2.33 2.14 2.12 1.62 1.62 (T12+T23) / EP12 1.26 1.29 1.41 1.41 1.32 1.30 1.82 1.82 (D2m-d2m) / R6 -5.49 -5.49 -7.11 -4.98 -5.54 -7.42 -7.27 -10.09 L / CT3 5.88 5.88 6.58 6.58 7.68 7.68 7.40 7.40 f23 / (CP2+T23) 3.20 3.20 2.73 2.86 2.56 2.56 2.88 2.88 f12 / (EP01+EP12) -0.94 -0.95 -0.74 -0.74 -0.77 -0.77 -1.47 -1.47 (T12+CP1) / d1s 0.42 0.43 0.49 0.49 0.47 0.47 0.67 0.67

[0162] Table 15 shows parameters such as the effective focal length of each lens of the optical imaging lens of Examples 1 to 4.

[0163] Table 15

[0164] Parameters / Examples one two three Four f1(mm) -1.00 -1.15 -1.15 -1.90 f2(mm) -423.32 -11.25 -73.62 -94.56 f3(mm) 0.57 0.57 0.59 0.53 f12(mm) -0.99 -0.97 -1.12 -1.91 f23(mm) 0.57 0.58 0.59 0.51

[0165] The present application also provides an optical device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The optical device is equipped with the optical imaging lens described above, and the optical device can be an imaging module integrated in a mobile electronic device such as a mobile phone as in the present invention, or can be an independent imaging device such as a digital camera.

[0166] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0167] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0168] 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 the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0169] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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: The invention comprises a lens barrel and a lens group and a spacer element group arranged in the lens barrel, The lens group is composed of three lenses, and the three lenses are a first lens, a second lens and a third lens in order from the object side to the image side; among the first lens to the third lens, the third lens has the largest refractive index; The spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface portion of the first lens; Among them, the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens satisfy: -1.11≤(D0s-d0s) / R1≤-0.68; the curvature radius R2 of the image side surface of the first lens, the outer diameter D1s of the object side surface of the first spacing element and the inner diameter d1s of the object side surface of the first spacing element satisfy: -1.22≤R2 / (D1s-d1s)≤-0.

68.

2. The optical imaging lens according to claim 1, wherein: The axial spacing distance EP01 between the object side end face of the lens barrel and the object side face of the first spacing element, the air spacing T12 between the first lens and the second lens on the optical axis of the optical imaging lens, and the effective focal length f1 of the first lens satisfy: -1.23≤(EP01+T12) / f1≤-0.

83.

3. 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 surface portion of the second lens, The curvature radius R3 of the object side surface of the second lens, the curvature radius R4 of the image side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer element satisfy: 0.79 mm -1 ≤|R3 / R4| / d2s≤3.62mm -1 .

4. 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 surface portion of the second lens, An air interval T23 between the second lens to the third lens on the optical axis of the optical imaging lens and a maximum axial thickness CP2 of the second spacing element satisfy the following: 4.91≤T23 / CP2≤9.

14.

5. The optical imaging lens according to claim 1, wherein: The axial spacing distance EP01 from the object side end face of the lens barrel to the object side face of the first spacing element, the maximum axial thickness CP1 of the first spacing element, and the center thickness CT1 of the first lens on the optical axis of the optical imaging lens satisfy the following: 1.62≤(EP01+CP1) / CT1≤2.

70.

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 surface portion of the second lens, An air gap T12 between the first lens and the second lens on the optical axis of the optical imaging lens, an air gap T23 between the second lens and the third lens on the optical axis, and an axial spacing distance EP12 from the image side surface of the first spacing element to the object side surface of the second spacing element satisfy the following: 1.26≤(T12+T23) / EP12≤1.

82.

7. 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 surface portion of the second lens, The outer diameter D2m of the image side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element, and the curvature radius R6 of the image side surface of the third lens satisfy: -10.09≤(D2m-d2m) / R6≤-4.

98.

8. The optical imaging lens according to claim 1, wherein: The central thickness CT3 of the third lens on the optical axis of the optical imaging lens and the maximum axial height L of the lens barrel satisfy the following: 5.88≤L / CT3≤7.

68.

9. 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 surface portion of the second lens, The combined focal length f23 of the second lens and the third lens, the maximum axial thickness CP2 of the second spacing element, and the air interval T23 between the second lens and the third lens on the optical axis of the optical imaging lens satisfy the following: 2.56≤f23 / (CP2+T23)≤3.

20.

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 surface portion of the second lens, The combined focal length f12 of the first lens and the second lens, the axial spacing distance EP01 from the object side end face of the lens barrel to the object side face of the first spacing element, and the axial spacing distance EP12 from the image side face of the first spacing element to the object side face of the second spacing element satisfy: -1.47≤f12 / (EP01+EP12)≤-0.

74.

11. The optical imaging lens according to any one of claims 1 to 10, characterized in that: The first lens has negative optical power, the object side surface of the first lens is concave, and the image side surface of the first lens is convex; the second lens has negative optical power; the third lens has positive optical power, and the image side surface of the third lens is convex.

Images