Optical imaging lens

Abstract

The utility model 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 a three-piece type optical imaging lens in the prior art is easy to cause unstable assembly of a front-end lens and increase of internal reflection stray light when meeting appearance requirements.

Description

Technical Field

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

[0002] With the popularization of smart electronic devices and the continuous advancement of technology, optical under-display fingerprint recognition technology has become an important means of secure unlocking of smart electronic devices, and the optical imaging lenses used in optical under-display fingerprint recognition are attracting increasing attention from users. Three-element optical imaging lenses are widely used in various electronic devices due to their high fingerprint recognition accuracy and strong adaptability.

[0003] Currently, to control the appearance of a three-element optical imaging lens to match the size of the phone's fingerprint sensor, the front-end size of the lens typically needs to be controlled. This is achieved by optimizing the front-end size and aperture to meet performance requirements. However, this approach can easily affect the stable assembly of the front-end lens and lead to internal reflections and stray light, directly reducing the clarity and efficiency of fingerprint recognition.

[0004] In other words, existing three-element optical imaging lenses have the problem that meeting aesthetic requirements can easily lead to instability in the front lens assembly and an increase in internal reflection stray light. Utility Model Content

[0005] The main objective of this invention is to provide an optical imaging lens to solve the problems of existing three-element optical imaging lenses, which easily lead to unstable front-end lens assembly and increased internal reflection stray light in order to meet appearance requirements.

[0006] To achieve the above objectives, 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 disposed within the lens barrel. The lens group consists of three lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, and a third lens; among the first to third lenses, the third lens has the highest refractive index; the spacer element group includes a first spacer element disposed between the first and second lenses and in contact with the image-side surface of the first lens; wherein, the outer diameter D0s of the object-side end face of the lens barrel, the inner diameter d0s of the object-side end face of the lens barrel, and the radius of curvature R1 of the object-side surface of the first lens satisfy the following: -1.11≤(D0s-d0s) / R1≤-0.68; the radius of curvature 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: -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 disposed in the lens barrel. The lens group consists of three lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, and a third lens. Among the first to third lenses, the third lens has the highest refractive index. The spacer element group includes a first spacer element disposed between the first and second lenses and in contact with the image side surface of the first lens. The outer diameter D0s of the object side end face of the lens barrel, the inner diameter d0s of the object side end face of the lens barrel, and the radius of curvature R1 of the object side surface of the first lens satisfy the following condition: -1.11≤(D0s-d0s) / R1≤-0.68. The axial spacing distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element, the air spacing T12 between the first and second lenses on the optical axis of the optical imaging lens, and the effective focal length f1 of the first lens satisfy the following condition: -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 disposed in the lens barrel. The lens group consists of three lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, and a third lens. Among the first to third lenses, the third lens has the highest refractive index. The spacer element group includes a first spacer element disposed between the first and second lenses and in contact with the image side surface of the first lens. The outer diameter D0s of the object side end face of the lens barrel, the inner diameter d0s of the object side end face of the lens barrel, and the radius of curvature R1 of the object side surface of the first lens satisfy the following condition: -1.11≤(D0s-d0s) / R1≤-0.68. The axial spacing distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element, the air spacing T12 between the first and second lenses 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 condition: 0.42≤(T12+CP1) / d1s≤0.67.

[0009] Furthermore, the axial spacing distance EP01 between the object-side end face of the lens barrel and the object-side side face of the first spacer 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 the following: -1.23≤(EP01+T12) / f1≤-0.83.

[0010] 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 surface of the second lens. The radius of curvature R3 of the object-side surface of the second lens, the radius of curvature 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 the following condition: 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. The air gap T23 between the second lens and the third lens on the optical axis of the optical imaging lens satisfies the following condition with respect to the maximum axial thickness CP2 of the second spacer element: 4.91≤T23 / CP2≤9.14.

[0012] Furthermore, the axial spacing distance EP01 between the object-side end face of the lens barrel and the object-side side face of the first spacer element, the maximum axial thickness CP1 of the first spacer 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.

[0013] 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 surface of the second lens. The air gap T12 between the first lens and the second lens on the optical axis of the optical imaging lens, the air gap T23 between the second lens and the third lens on the optical axis, and the axial spacing distance EP12 between the image-side surface of the first spacer element and the object-side surface of the second spacer element satisfy the following: 1.26≤(T12+T23) / EP12≤1.82.

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

[0015] Furthermore, the central thickness CT3 of the third lens on the optical axis of the optical imaging lens satisfies the following condition with respect to the maximum axial height L of the lens barrel: 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. 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 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.

[0017] 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 surface 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 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 the following: -1.47≤f12 / (EP01+EP12)≤-0.74.

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

[0019] Applying the technical solution of this utility model, the optical imaging lens of this application consists of a lens barrel and three lenses and a spacer element disposed within the lens barrel. By rationally arranging the positions of the three lenses and the first spacer 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, thereby controlling the light transmission aperture of the lens barrel, and thus controlling the amount of light entering the optical imaging lens; controlling the outer diameter of the object-side end face of the lens barrel allows control over the size of the lens barrel head; by optimizing the head size and light transmission 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. Since the overall appearance is optimal when the head size of the optical imaging lens is slightly larger than the window size; the overall appearance is second best when the head size of the optical imaging lens is larger than the window size; and the overall appearance is worst when the head size of the optical imaging lens is smaller than the window size. Therefore, this arrangement can ensure both appearance and fingerprint recognition performance of the optical imaging lens. However, this situation can easily affect the stable assembly of the front-end lens, especially the first lens, and can also easily lead to internal reflection stray light from the first lens, reducing the clarity and efficiency of fingerprint recognition by the optical imaging lens. Therefore, this application constrains the radius of curvature of the image side of the first lens to the difference between the inner and outer diameters of the object side of the first spacer element by -1.22≤R2 / (D1s-d1s)≤-0.68. This ensures a larger contact area between the first spacer element and the first lens, thereby improving the assembly stability of the first lens and the first spacer element in the lens barrel, and thus improving the assembly stability of the front-end structure of the optical imaging lens. At the same time, it can also control the inner diameter of the object side of the first spacer element to be within a smaller range, so that the first spacer element can effectively intercept stray light, reduce internal reflection stray light from the first lens, and effectively improve the clarity and efficiency of fingerprint recognition by the optical imaging lens. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

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

[0022] Figure 2 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-1 of this utility model is shown;

[0023] Figure 3 A schematic diagram of the structure of the optical imaging lens of Embodiments 1-2 of this utility model is shown;

[0024] Figures 4 to 7 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 of this utility model are shown respectively.

[0025] Figure 8 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-1 of this utility model is shown;

[0026] Figure 9 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-2 of this utility model is shown;

[0027] Figures 10 to 13 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 of this utility model are shown respectively.

[0028] Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-1 of this utility model is shown;

[0029] Figure 15 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-2 of this utility model is shown;

[0030] Figures 16 to 19 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 of this utility model are shown.

[0031] Figure 20 A schematic diagram of the structure of the optical imaging lens of Embodiment 4-1 of this utility model is shown;

[0032] Figure 21 A schematic diagram of the structure of the optical imaging lens of Embodiment 4-2 of this utility model is shown;

[0033] Figures 22 to 25The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 of this utility model are shown.

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

[0035] Figure 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.

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

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

[0038] P0, Lens tube; E1, First lens; P1, First spacer element; E2, Second lens; P2, Second spacer 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 Implementation

[0039] 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.

[0040] 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.

[0041] In this utility model, 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 used to limit this utility model.

[0042] 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.

[0043] 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.

[0044] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the 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 the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to the judgment method commonly known 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 database of optical software) to determine concavity or convexity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex. In this application, the left side is the object side, and the right side is the image side.

[0045] In-display fingerprint technology primarily employs two methods: ultrasonic and optical. Ultrasonic in-display fingerprint technology utilizes the penetrating power of ultrasound, analyzing the differences in ultrasound reflection on the fingerprint to depict its pattern. Optical in-display fingerprint technology leverages the self-emissive properties of OLED screens, using an electronic photosensitive element beneath the screen to capture the light reflected from the fingerprint for recognition. This method offers advantages such as high recognition accuracy, wide applicability, and relatively low cost. This invention aims to provide an optical imaging lens for in-display fingerprint recognition, consisting of three lenses. In other words, the optical imaging lens of this invention is used for in-display fingerprint recognition.

[0046] To address the problems of unstable front-end lens assembly and increased internal reflection stray light in existing three-element optical imaging lenses that easily lead to instability in the front-end lens assembly due to meeting aesthetic requirements, this invention provides an optical imaging lens.

[0047] like Figures 1 to 26As shown, in an optional embodiment of this application, the optical imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of three lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, and a third lens. Among the first to third lenses, the third lens has the highest refractive index. The spacer element group includes a first spacer element disposed between the first and second lenses and in contact with the image side surface of the first lens. The outer diameter D0s of the object side end face of the lens barrel, the inner diameter d0s of the object side end face of the lens barrel, and the radius of curvature R1 of the object side surface of the first lens satisfy the following: -1.11≤(D0s-d0s) / R1≤-0.68. The radius of curvature 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: -1.22≤R2 / (D1s-d1s)≤-0.68.

[0048] The optical imaging lens of this application consists of a lens barrel and three lenses and a spacer element disposed within the lens barrel. By rationally arranging the positions of the three lenses and the first spacer 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, thereby controlling the light transmission aperture of the lens barrel and thus controlling the amount of light entering the optical imaging lens. Controlling the outer diameter of the object-side end face of the lens barrel allows control over the size of the lens barrel's head. By optimizing the head size and light transmission 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. Since the overall appearance is optimal when the head size of the optical imaging lens is slightly larger than the window size, the overall appearance is second best when the head size is larger than the window size, and the overall appearance is worst when the head size is smaller than the window size. Therefore, this arrangement ensures both aesthetics and the fingerprint recognition performance of the optical imaging lens. However, this situation can easily affect the stable assembly of the front-end lens, especially the first lens, and can also easily lead to internal reflection stray light from the first lens, reducing the clarity and efficiency of fingerprint recognition by the optical imaging lens. Therefore, this application constrains the radius of curvature of the image side of the first lens to the difference between the inner and outer diameters of the object side of the first spacer element by -1.22≤R2 / (D1s-d1s)≤-0.68. This ensures a larger contact area between the first spacer element and the first lens, thereby improving the assembly stability of the first lens and the first spacer element in the lens barrel, and thus improving the assembly stability of the front-end structure of the optical imaging lens. At the same time, it can also control the inner diameter of the object side of the first spacer element to be within a smaller range, so that the first spacer element can effectively intercept stray light, reduce internal reflection stray light from the first lens, and effectively improve the clarity and efficiency of fingerprint recognition by the optical imaging lens.

[0049] In addition, please refer to Table 1 below. Figures 26 to 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, Figure 26 The stray light energy distribution diagram of the optical imaging lens of Scheme 1 of this application is shown when (D0s-d0s) / R1=-0.82 and R2 / (D1s-d1s)=-1.19. Figure 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. Figure 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 Figures 26 to 28 It can be seen that when the optical imaging lens satisfies R2 / (D1s-d1s)=-1.19, the contact area between the first spacer element and the first lens is large, the assembly stability of the first lens and the first spacer element is good, and the front end assembly stability of the optical imaging lens is good. At the same time, the inner diameter of the object side of the first spacer element is small, the internal reflection stray light of the first lens is relatively slight, and the maximum energy intensity of the stray light is approximately 0.000002875lm / mm. 2 The total energy intensity is approximately 0.000001528 lm, which is relatively good. When the optical imaging lens satisfies R2 / (D1s-d1s)=-1.60, the 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 relatively serious. The maximum energy intensity of the stray light is approximately 0.000197675 lm / mm. 2 The total energy intensity is approximately 0.0000643128 lm, indicating poor overall performance. When the optical imaging lens satisfies R2 / (D1s-d1s)=-0.15, the contact area between the first spacer element and the first lens is small, resulting in poor assembly stability. Furthermore, the inner diameter of the object side of the first spacer element is small, leading to severe internal reflection stray light from the first lens. The maximum energy intensity of the stray light is approximately 0.00023725 lm / mm. 2 The total energy intensity is approximately 0.000065651 lm, which is a poor overall performance.

[0051] Therefore, it can be seen that when -1.11≤(D0s-d0s) / R1≤-0.68 and R2 / (D1s-d1s) is controlled within the range of -1.22 to -0.68, the assembly stability of the first lens and the first spacer 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 reduced, resulting in the best performance. Therefore, by constraining -1.11≤(D0s-d0s) / R1≤-0.68 and -1.22≤R2 / (D1s-d1s)≤-0.68, this application can ensure a large contact area between the first spacer element and the first lens, thereby improving the assembly stability of the first lens and the first spacer element in the lens barrel, and further improving the assembly stability of the front-end structure of the optical imaging lens. Simultaneously, it can control the inner diameter of the object-side surface of the first spacer element to be within a small range, reducing the internal reflection stray light of the first lens, and effectively improving the clarity and efficiency of fingerprint recognition by the optical imaging lens.

[0052] Table 1

[0053]

[0054]

[0055] In this embodiment, the spacer group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side portion of the second lens.

[0056] In this embodiment, the axial distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element, the air gap 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 the following condition: -1.23 ≤ (EP01 + T12) / f1 ≤ -0.83. By controlling this condition, it can be ensured that the projections of the contact surfaces of the first lens and the lens barrel and the contact surfaces of the first lens and the first spacer element on each other are at least partially overlapping, and 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 condition, the interception of light emitted from the first lens by the first spacer element can be controlled. While ensuring the relative illumination of the optical imaging lens, it can be ensured that the first spacer element can effectively intercept stray light from the edges, thereby improving stray light and ensuring high imaging quality of the optical imaging lens.

[0057] In this embodiment, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature 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 the following relationship: 0.79 mm. -1 ≤|R3 / R4| / d2s≤3.62mm -1By controlling this conditional expression, the surface shape 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 spherical aberration and astigmatism in the optical imaging lens. At the same time, it can also constrain the inner diameter of the object-side surface of the second spacer element, ensuring that the inner diameter of the object-side surface of the second spacer element is close to the optical outer diameter of the image-side surface of the second lens, and that the inner diameter of the image-side surface of the second spacer element is close to the optical outer diameter of the object-side surface of the third lens. This helps to improve the effect of the second spacer element in intercepting stray light between the second and third lenses.

[0058] In this embodiment, the air gap T23 between the second and third lenses on the optical axis of the optical imaging lens and the maximum axial thickness CP2 of the second spacer element satisfy the condition: 4.91 ≤ T23 / CP2 ≤ 9.14. By controlling this condition, the air gap between the second and third lenses on the optical axis and the maximum axial thickness of the second spacer element can be controlled, optimizing the surface profile of the image side of the second lens and the object side of the third lens, thereby reducing internal reflection stray light from the second and third lenses and thus helping to improve the imaging quality of the optical imaging lens.

[0059] In this embodiment, the axial spacing distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element, the maximum axial thickness CP1 of the first spacer element, and the center thickness CT1 of the first lens on the optical axis of the optical imaging lens satisfy the following condition: 1.62≤(EP01+CP1) / CT1≤2.70. By controlling this condition, the ratio of the axial spacing distance between the object-side end face of the lens barrel and the image-side surface of the first spacer element to the center thickness of the first lens on the optical axis is ensured to be appropriate, which is beneficial to improving the forming stability of the first lens and facilitating its formation. At the same time, it also ensures 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 spacer element, at least partially overlap in their projections, and ensures that the overlapping area of ​​the projections of the two bearing surfaces on each other is large, thereby effectively improving the front end assembly stability of the optical imaging lens.

[0060] In this embodiment, the air gap T12 between the first and second lenses on the optical axis of the optical imaging lens, the air gap T23 between the second and third lenses on the optical axis, and the axial distance EP12 between the image side of the first spacer element and the object side of the second spacer element satisfy the following condition: 1.26 ≤ (T12 + T23) / EP12 ≤ 1.82. By controlling this condition, the positions of the first, second, and third lenses can be precisely limited, which is beneficial to improving the structural compactness of the optical imaging lens and also helps to correct off-axis aberrations 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 radius of curvature R6 of the image-side surface of the third lens satisfy the following condition: -10.09≤(D2m-d2m) / R6≤-4.98. By controlling this condition, the ratio between the difference between the inner and outer diameters of the image-side surface of the second spacer element and the radius of curvature of the image-side surface of the third lens can be controlled. This ensures that the second spacer element can adequately block stray light from the edges of the second lens, reducing the possibility of stray light propagating to the rear, while not affecting the stable passage of imaging light, thereby improving the imaging quality of the optical imaging lens.

[0062] In this embodiment, the central thickness CT3 of the third lens along the optical axis of the optical imaging lens satisfies the following relationship with the maximum axial height L of the lens barrel: 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 to the image-side end face of the lens barrel. By controlling this condition, the ratio of the central thickness of the third lens along the optical axis to the maximum axial height of the lens barrel can be controlled within a certain range. This helps to make the thickness distribution of the third lens more uniform, ensures the assembly stability of the third lens, and also balances the aberrations of the optical imaging lens, effectively shortening the total length of the optical imaging lens along the optical axis.

[0063] In this embodiment, the combined focal length f23 of the second and third lenses, the maximum axial thickness CP2 of the second spacer element, and the air gap T23 between the second and third lenses on the optical axis of the imaging lens satisfy the following condition: 2.56 ≤ f23 / (CP2+T23) ≤ 3.20. By controlling this condition, the optical power and surface shape of the second and third lenses can be controlled, resulting in a uniform thickness distribution of the second and third lenses. This ensures the manufacturability and structural strength of the second and third lenses, and also helps to balance the aberrations generated at the front and rear ends of the imaging lens, thus shortening the total length of the imaging lens along the optical axis.

[0064] In this embodiment, the combined focal length f12 of the first and second lenses, the axial spacing EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element, and the axial spacing EP12 between the image-side surface of the first spacer element and the object-side surface of the second spacer element satisfy the following condition: -1.47 ≤ f12 / (EP01+EP12) ≤ -0.74. By controlling this condition, the range of the combined focal length of the first and second lenses can be constrained, which is beneficial for reasonably controlling the optical power contribution range of the first and second lenses, thereby controlling the contribution of the negative spherical aberration of the first and second lenses. This allows them to reasonably balance the positive spherical aberration generated by the third lens with positive optical power, and also helps to improve the thickness uniformity of the first and second lenses, thus ensuring the shaping of the first and second lenses.

[0065] In this embodiment, the first lens has negative optical power, its object-side surface is concave, and its image-side surface is convex; the second lens has negative optical power; and the third lens has positive optical power, with its image-side surface also convex. The negative optical power of the first and second lenses, and the positive optical power of the third lens, ensure a reasonable sequence of light divergence followed by convergence within the lens group, optimizing the light propagation path, reducing spherical aberration, and improving the imaging quality of the optical imaging lens, while also meeting the miniaturization requirements of a three-element optical imaging lens. The lens surface configuration described above ensures that light undergoes reasonable refraction and reflection within the optical imaging lens, optimizing light focusing and divergence, and improving the image sharpness of the optical imaging lens.

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

[0067] In this embodiment, each lens can be optionally configured as a tangent lens. The outer diameter surface of the tangent lens has a tangent structure and a non-tangent structure, with the outer diameter of the tangent structure being smaller than the outer diameter of the non-tangent structure. The outer diameter of the tangent lens typically refers to the outer diameter of the non-tangent structure.

[0068] In this embodiment, each spacer element can be optionally configured as a truncated spacer element. The outer ring surface of the truncated spacer element has a truncated portion and a non-truncated portion, with the outer diameter of the truncated portion being smaller than the outer diameter of the non-truncated portion. The outer diameter of the truncated spacer element typically refers to the maximum outer diameter of the non-truncated portion.

[0069] In another optional embodiment of this application, an optical imaging lens is provided, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of three lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, and a third lens. Among the first to third lenses, the third lens has the highest refractive index. The spacer element group includes a first spacer element disposed between the first and second lenses and in contact with the image side surface of the first lens. The outer diameter D0s of the object side end face of the lens barrel, the inner diameter d0s of the object side end face of the lens barrel, and the radius of curvature R1 of the object side surface of the first lens satisfy the following: -1.11≤(D0s-d0s) / R1≤-0.68. The axial spacing distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element, the air spacing T12 between the first and second lenses on the optical axis of the optical imaging lens, and the effective focal length f1 of the first lens satisfy the following: -1.23≤(EP01+T12) / f1≤-0.83.

[0070] The optical imaging lens of this application consists of a lens barrel and three lenses and a spacer element disposed within the lens barrel. By rationally arranging the positions of the three lenses and the first spacer 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, thereby controlling the light transmission aperture of the lens barrel and thus controlling the amount of light entering the optical imaging lens. Controlling the outer diameter of the object-side end face of the lens barrel allows control over the size of the lens barrel's head. By optimizing the head size and light transmission 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. Since the overall appearance is optimal when the head size of the optical imaging lens is slightly larger than the window size, the overall appearance is second best when the head size is larger than the window size, and the overall appearance is worst when the head size is smaller than the window size. Therefore, this arrangement ensures both aesthetics and the fingerprint recognition performance of the optical imaging lens. However, this condition can easily affect the stable assembly of the front-end lens, especially the first lens, and can also easily lead to internal reflection stray light from the first lens, reducing the clarity and efficiency of fingerprint recognition by the optical imaging lens. Therefore, this application, by constraining -1.23≤(EP01+T12) / f1≤-0.83, ensures that the projections of the contact surfaces of the first lens and the lens barrel and the contact surfaces of the first lens and the first spacer element on each other are at least partially overlapping, and ensures 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 condition, the interception of the light emitted from the first lens by the first spacer element can be controlled. While ensuring the relative illumination of the optical imaging lens, the first spacer element can effectively intercept edge stray light, thereby improving stray light and ensuring high imaging quality of the optical imaging lens.

[0071] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0072] In another optional embodiment of this application, an optical imaging lens is also provided, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of three lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, and a third lens. Among the first to third lenses, the third lens has the highest refractive index. The spacer element group includes a first spacer element disposed between the first and second lenses and in contact with the image side surface of the first lens. The outer diameter D0s of the object side end face of the lens barrel, the inner diameter d0s of the object side end face of the lens barrel, and the radius of curvature R1 of the object side surface of the first lens satisfy the following: -1.11≤(D0s-d0s) / R1≤-0.68. The axial spacing distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element, the air gap T12 between the first and second lenses 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: 0.42≤(T12+CP1) / d1s≤0.67.

[0073] The optical imaging lens of this application consists of a lens barrel and three lenses and a spacer element disposed within the lens barrel. By rationally arranging the positions of the three lenses and the first spacer 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, thereby controlling the light transmission aperture of the lens barrel and thus controlling the amount of light entering the optical imaging lens. Controlling the outer diameter of the object-side end face of the lens barrel allows control over the size of the lens barrel's head. By optimizing the head size and light transmission 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. Since the overall appearance is optimal when the head size of the optical imaging lens is slightly larger than the window size, the overall appearance is second best when the head size is larger than the window size, and the overall appearance is worst when the head size is smaller than the window size. Therefore, this arrangement ensures both aesthetics and the fingerprint recognition performance of the optical imaging lens. However, this situation can easily affect the stable assembly of the front-end lens, especially the first lens, and can also easily lead to internal reflection stray light from the first lens, reducing the clarity and efficiency of fingerprint recognition by the optical imaging lens. Therefore, this application optimizes the relative position of the first and second lenses by constraining 0.42≤(T12+CP1) / d1s≤0.67, improving the assembly accuracy and stability of the front-end structure of the optical imaging lens. It also helps reduce the reflection of stray light between the first and second lenses, reducing the generation of internal reflection stray light from the first and second lenses, ensuring that the first spacer element can effectively intercept edge stray light, thereby improving the clarity and contrast of the image.

[0074] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

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

[0076] The optical imaging lens in this application may employ multiple lenses, such as the three lenses described above. 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 the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0077] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although a three-lens configuration has been described in the embodiments, the optical imaging lens is not limited to including three lenses. If desired, the optical imaging lens may also include other numbers of lenses.

[0078] Figure 1 A schematic diagram showing the dimensions of an optical imaging lens according to this application is provided. Figure 1 The figures clearly indicate parameters such as d0s, D0s, d1s, D1s, d2s, d2m, D2m, EP01, CP1, EP12, CP2, and L to provide a clear and intuitive understanding of their meaning. To facilitate the description of the optical imaging lens and the surface shape of specific lenses, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0079] 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.

[0080] It should be noted that in the following Embodiment 1, there are two examples: Embodiment 1-1 and Embodiment 1-2; in Embodiment 2, there are two examples: Embodiment 2-1 and Embodiment 2-2; in Embodiment 3, there are two examples: Embodiment 3-1 and Embodiment 3-2; and in Embodiment 4, there are two examples: Embodiment 4-1 and Embodiment 4-2. In the two examples within the same embodiment, the curvature radius, center thickness, and other parameters of the optical imaging lens from the first to the third lens, as well as the spacing distance between the lenses and the higher-order coefficients, are the same. However, the thickness, inner diameter, and outer diameter of the lens barrel and each spacer element are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0081] It should be noted that any one of the examples in Embodiments 1 to 4 described below is applicable to all implementations of this application.

[0082] Example 1

[0083] like Figures 2 to 7 As shown, the optical imaging lens of Embodiment 1 is described. Figure 2 A schematic diagram of the optical imaging lens of Embodiment 1-1 is shown. Figure 3 A schematic diagram of the optical imaging lens of Embodiments 1-2 is shown.

[0084] like Figures 2 to 3 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer element P1, a second lens E2, a second spacer 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 and an image-side surface S8.

[0085] like Figure 2 The diagram shows a schematic of the optical imaging lens in Embodiment 1-1. In this example, the object-side and image-side surfaces 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 and image-side surfaces 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 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 1-2. The bearing and contact method of each spacer element in this example is the same as that in Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0087] In summary, the structural parameters of the optical imaging lens of Embodiment 1 under Embodiments 1-1 and 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 Embodiment 1, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex.

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

[0092] Table 3 shows the basic structural parameters of the optical imaging lens in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0093] Table 3

[0094]

[0095] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the third lens E3 are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0096]

[0097] 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, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 and A28 that can be used for the aspherical lens surfaces S1-S6 in Example 1.

[0098] Table 4

[0099]

[0100]

[0101] Figure 4 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 5 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 6 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 7 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0102] according to Figures 4 to 7As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0103] Example 2

[0104] like Figures 8 to 13 As shown, the optical imaging lens of Embodiment 2 is described. Figure 8 A schematic diagram of the optical imaging lens of Embodiment 2-1 is shown. Figure 9 A schematic diagram of the optical imaging lens of Embodiment 2-2 is shown.

[0105] like Figures 8 to 9 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer element P1, a second lens E2, a second spacer 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 and an image-side surface S8.

[0106] like Figure 8 The diagram shows a schematic of the optical imaging lens in Embodiment 2-1. In this example, the object-side and image-side of the first spacer element P1 are in partial contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer element P2 are in partial contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively.

[0107] like Figure 9 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 2-2. The abutment and contact method of each spacer element in this example is the same as that in Embodiment 2-1, and can be referred to the relevant description in Embodiment 2-1, which will not be repeated here.

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

[0109] Table 5

[0110]

[0111]

[0112] In Embodiment 2, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex.

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

[0114] Table 6 shows the basic structural parameters of the optical imaging lens in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0115] Table 6

[0116]

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

[0118] Table 7

[0119]

[0120]

[0121] Figure 10 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 11 The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12 The distortion curve of the optical imaging lens of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 13 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0122] according to Figures 10 to 13 It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0123] Example 3

[0124] like Figures 14 to 19 As shown, the optical imaging lens of Embodiment 3 is described. Figure 14 A schematic diagram of the optical imaging lens of Embodiment 3-1 is shown. Figure 15 A schematic diagram of the optical imaging lens of Embodiment 3-2 is shown.

[0125] like Figures 14 to 15 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer element P1, a second lens E2, a second spacer 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 and an image-side surface S8.

[0126] like Figure 14 The diagram shows a schematic of the optical imaging lens in Embodiment 3-1. In this example, the object-side and image-side surfaces 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 and image-side surfaces 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 Figure 15 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 3-2. The abutment and contact method of each spacer element in this example is the same as that in Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0128] In summary, the structural parameters of the optical imaging lens of Embodiment 3 under Embodiments 3-1 and 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 Embodiment 3, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is convex. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex.

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

[0133] Table 9 shows the basic structural parameters of the optical imaging lens in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0134] Table 9

[0135]

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

[0137] Table 10

[0138]

[0139] Figure 16 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 17 The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 18 The distortion curve of the optical imaging lens of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 19 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0140] according to Figures 16 to 19 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0141] Example 4

[0142] like Figures 20 to 25 As shown, the optical imaging lens of Embodiment 4 is described. Figure 20 A schematic diagram of the optical imaging lens of Embodiment 4-1 is shown. Figure 21 A schematic diagram of the optical imaging lens of Embodiment 4-2 is shown.

[0143] like Figures 20 to 21 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer element P1, a second lens E2, a second spacer 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 and an image-side surface S8.

[0144] like Figure 20 The diagram shows a schematic of the optical imaging lens in Embodiment 4-1. In this example, the object-side and image-side of the first spacer element P1 are in partial contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer element P2 are in partial contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively.

[0145] like Figure 21 The diagram shown is a structural schematic of the optical imaging lens of Example 4-2. The abutment method of each spacer element in this example is the same as that in Example 4-1, and can be referred to the relevant description in Example 4-1, which will not be repeated here.

[0146] In summary, the structural parameters of the optical imaging lens of Embodiment 4 under Embodiments 4-1 and 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 Embodiment 4, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is convex. The object-side surface S5 of the third lens is concave, and the image-side surface S6 of the third lens is convex.

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

[0151] Table 12 shows the basic structural parameters of the optical imaging lens in Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0152] Table 12

[0153]

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

[0155] Table 13

[0156]

[0157] Figure 22 The 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 23 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 24The 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 25 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0158] according to Figures 22 to 25 It can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0159] In summary, Examples 1 to 4 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 the effective focal length and other parameters of each lens of the optical imaging lens in 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] This application also provides an optical device whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The optical device is equipped with the optical imaging lens described above. This optical device can be integrated into an imaging module in a mobile electronic device such as a mobile phone, as described in this invention, or it can be a standalone imaging device such as a digital camera.

[0166] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0167] 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.

[0168] 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.

[0169] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An optical imaging lens, characterized in that, It includes a lens barrel and a lens assembly and a spacer assembly disposed within the lens barrel. The lens group consists of three lenses, which are arranged in sequence from the object side to the image side as a first lens, a second lens, and a third lens; among the first lens to the third lens, the third lens has the highest 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 portion of the first lens; The outer diameter D0s of the object-side end face of the lens barrel, the inner diameter d0s of the object-side end face of the lens barrel, and the radius of curvature R1 of the object-side surface of the first lens satisfy the following: -1.11≤(D0s-d0s) / R1≤-0.68; the radius of curvature 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: -1.22≤R2 / (D1s-d1s)≤-0.

68.

2. The optical imaging lens according to claim 1, characterized in that, The axial distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element, the air gap 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 the following: -1.23≤(EP01+T12) / f1≤-0.

83.

3. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side surface portion of the second lens. The radius of curvature R3 of the object-side surface of the second lens, the radius of curvature 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 the following condition: 0.79 mm. -1 ≤|R3 / R4| / d2s≤3.62mm -1 .

4. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side surface portion of the second lens. The air gap T23 between the second lens and the third lens on the optical axis of the optical imaging lens satisfies the following condition with respect to the maximum axial thickness CP2 of the second spacer element: 4.91≤T23 / CP2≤9.

14.

5. The optical imaging lens according to claim 1, characterized in that, The axial distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element, the maximum axial thickness CP1 of the first spacer element, and the center thickness CT1 of the first lens on the optical axis of the optical imaging lens satisfy the following condition: 1.62≤(EP01+CP1) / CT1≤2.

70.

6. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side surface portion of the second lens. The air gap T12 between the first lens and the second lens on the optical axis of the optical imaging lens, the air gap T23 between the second lens and the third lens on the optical axis, and the axial distance EP12 between the image side of the first spacer element and the object side of the second spacer element satisfy the following: 1.26≤(T12+T23) / EP12≤1.

82.

7. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side surface portion of the second lens. The outer diameter D2m of the image side of the second spacer element, the inner diameter d2m of the image side of the second spacer element, and the radius of curvature R6 of the image side of the third lens satisfy the following condition: -10.09≤(D2m-d2m) / R6≤-4.

98.

8. The optical imaging lens according to claim 1, characterized in that, The central thickness CT3 of the third lens on the optical axis of the optical imaging lens satisfies the following condition with respect to the maximum axial height L of the lens barrel: 5.88≤L / CT3≤7.

68.

9. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side 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 spacer element, and the air gap 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, characterized in that, The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side 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 spacer element, and the axial spacing distance EP12 from the image side face of the first spacer element to the object side face of the second spacer element satisfy the following: -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 of the first lens is concave, and the image side of the first lens is convex; the second lens has negative optical power; the third lens has positive optical power, and the image side of the third lens is convex.

Images