Optical imaging lens

Abstract

The present application discloses an optical imaging lens comprising, in order from the object side to the image side along the optical axis, a first lens having optical power, its object-side surface being convex; a second lens having optical power, its object-side surface being convex; a third lens having negative optical power; and a fourth lens having optical power, its image-side surface being convex. The optical imaging lens satisfies the following conditions: Semi-FOV>51°, and the center thicknesses CT1 and CT4 of the first and fourth lenses on the optical axis satisfy the following conditions: CT1 / CT4<2.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and in particular to an optical imaging lens comprising four lenses. Background Art

[0002] With the rapid development of smartphones in recent years, the requirements for optical imaging lenses in smartphones have become increasingly stringent. For example, optical imaging lenses must have a wide field of view, a long depth of field, and good perspective. However, existing optical imaging lenses, while meeting the requirements for a wide field of view, struggle to meet the high-quality imaging requirements, resulting in poor imaging quality.

[0003] Therefore, how to provide an optical imaging lens to improve the field of view and imaging quality of the optical imaging lens is an urgent problem to be solved in current optical imaging lens products. Summary of the Invention

[0004] The present application provides an optical imaging lens that can at least solve or partially solve at least one of the above-mentioned shortcomings in the prior art.

[0005] One aspect of the present application provides an optical imaging lens comprising, in order from the object side to the image side along the optical axis: a first lens having optical power, whose object-side surface is convex; a second lens having optical power, whose object-side surface is convex; a third lens having negative optical power; and a fourth lens having optical power, whose image-side surface is convex; wherein half of the maximum field of view (Semi-FOV) of the optical imaging lens satisfies the following: Semi-FOV>51°; and the center thickness CT1 of the first lens and the center thickness CT4 of the fourth lens on the optical axis satisfy the following: CT1 / CT4<2.

[0006] According to an exemplary embodiment of the present application, the air interval T34 between the third lens and the fourth lens on the optical axis and the air interval T23 between the second lens and the third lens on the optical axis satisfy the following conditions: <T34 / T23<1.5。

[0007] According to an exemplary embodiment of the present application, the combined focal length f234 of the second lens, the third lens, and the fourth lens and the total effective focal length f of the optical imaging lens satisfy: 1≤f234 / f<2.5.

[0008] According to an exemplary embodiment of the present application, the center thickness CT4 of the fourth lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 1.53 <CT4 / CT3<3.6。

[0009] According to an exemplary embodiment of the present application, the entrance pupil diameter EPD of the optical imaging lens and the effective focal length f1 of the first lens satisfy: -1.5mm 2<EPD×f1<0mm 2 .

[0010] According to an exemplary embodiment of the present application, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy the following conditions: -1.5 <f2 / f3<0。

[0011] According to an exemplary embodiment of the present application, the sum of the center thicknesses ΣCT of the first lens to the fourth lens on the optical axis and the sum of the air intervals ΣAT between any two adjacent lenses from the first lens to the fourth lens on the optical axis satisfy the following conditions: 1 mm 2 <ΣCT×ΣAT<3mm 2 .

[0012] According to an exemplary embodiment of the present application, the curvature radius R2 of the image side surface of the first lens and the curvature radius R3 of the object side surface of the second lens satisfy: <R2 / R3<1.6。

[0013] According to an exemplary embodiment of the present application, the curvature radius R8 of the image side surface of the fourth lens and the effective focal length f4 of the fourth lens satisfy: <R8 / f4<0。

[0014] According to an exemplary embodiment of the present application, the maximum effective radius DT31 of the object side surface of the third lens and the maximum effective radius DT21 of the object side surface of the second lens satisfy: 1 <DT31 / DT21<2。

[0015] According to an exemplary embodiment of the present application, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 1 <ET1 / CT1+ET2 / CT2<3。

[0016] According to an exemplary embodiment of the present application, the Abbe number V1 of the first lens, the Abbe number V2 of the second lens, and the Abbe number V4 of the fourth lens satisfy: V1 = V2 = V4.

[0017] According to an exemplary embodiment of the present application, the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens on the optical axis satisfy the following conditions: <ET4 / CT4<0.8。

[0018] According to an exemplary embodiment of the present application, the optical imaging lens further includes a stop located between the first lens and the second lens.

[0019] Another aspect of the present application provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens having optical power, whose object-side surface is convex and whose image-side surface is concave; a second lens having optical power, whose object-side surface is convex; a third lens having negative optical power; and a fourth lens having optical power, whose image-side surface is convex; wherein, half of the maximum field of view (Semi-FOV) of the optical imaging lens satisfies: Semi-FOV>51°; the curvature radius R2 of the image-side surface of the first lens and the curvature radius R3 of the object-side surface of the second lens satisfy: 0 <R2 / R3<1.6。

[0020] The optical imaging lens provided herein utilizes multiple lenses, such as first through fourth lenses. By rationally controlling the center thickness of the first and fourth lenses along the optical axis, the optical imaging lens can obtain sufficient spacing and a higher degree of surface freedom, thereby increasing the field of view of the optical imaging lens, resulting in a wide field of view and a significant range of sharpness. Furthermore, the optical imaging lens provided herein optimizes the focal length, surface shape, radius of curvature, center thickness, and edge thickness of each lens, enabling the optical imaging lens to achieve high imaging quality while improving the field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0022] Figure 1 1 shows a schematic structural diagram of an optical imaging lens according to Example 1 of the present application;

[0023] Figures 2A to 2D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 1 are respectively shown;

[0024] Figure 3 1 shows a schematic structural diagram of an optical imaging lens according to Example 2 of the present application;

[0025] Figures 4A to 4D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 2 are respectively shown;

[0026] Figure 5 1 shows a schematic structural diagram of an optical imaging lens according to Example 3 of the present application;

[0027] 6A to 6D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 3 are respectively shown;

[0028] Figure 7 1 shows a schematic structural diagram of an optical imaging lens according to Example 4 of the present application;

[0029] Figures 8A to 8D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 4 are respectively shown;

[0030] Figure 9 1 shows a schematic structural diagram of an optical imaging lens according to Example 5 of the present application;

[0031] 10A to 10D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 5 are respectively shown;

[0032] Figure 11 1 shows a schematic structural diagram of an optical imaging lens according to Example 6 of the present application;

[0033] 12A to 12D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 6 are respectively shown;

[0034] Figure 13 1 shows a schematic structural diagram of an optical imaging lens according to Example 7 of the present application;

[0035] 14A to 14D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 7 are shown respectively;

[0036] Figure 15 shows a schematic structural diagram of an optical imaging lens according to Example 8 of the present application; and

[0037] 16A to 16D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 8 are respectively shown. DETAILED DESCRIPTION

[0038] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] It should be noted that in this specification, the terms "first," "second," "third," "fourth," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens, the third lens, or the fourth lens without departing from the teachings of this application.

[0040] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0041] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0042] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0043] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0044] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] The features, principles and other aspects of the present application are described in detail below.

[0046] The optical imaging lens according to an exemplary embodiment of the present application may include four lenses with optical power, namely, a first lens, a second lens, a third lens, and a fourth lens. These four lenses are arranged in sequence from the object side to the image side along the optical axis. An air gap may be provided between any two adjacent lenses among the first lens to the fourth lens.

[0047] In the exemplary embodiment, the first lens has positive or negative optical power; the second lens has positive or negative optical power; the third lens may have negative optical power; and the fourth lens has positive or negative optical power. By reasonably matching the optical power and surface shape of each lens in the optical system, the low-order aberrations of the optical system can be effectively balanced, and the tolerance sensitivity can be reduced. As an example, the first lens may have negative optical power, the second lens may have positive optical power, the third lens may have negative optical power, and the fourth lens may have positive optical power.

[0048] In the exemplary embodiment, the object side surface of the first lens may be convex, and the image side surface may be concave.

[0049] In the exemplary embodiment, the object side surface of the second lens may be convex.

[0050] In the exemplary embodiment, the image side surface of the fourth lens may be convex.

[0051] In the exemplary embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: CT1 / CT4 < 2. In the example, 0.3 < CT1 / CT4 < 1.2, and further, 0.3 < CT1 / CT4 < 0.8. By reasonably controlling the mutual relationship between the central thicknesses of the first lens and the fourth lens on the optical axis, the optical imaging lens can obtain sufficient spacing space and higher surface freedom, thereby increasing the field angle of the optical imaging lens, making the optical imaging lens have a wide field of view and showing a relatively large clear range.

[0052] In the exemplary embodiment, half of the maximum field angle of the optical imaging lens, Semi-FOV, satisfies: Semi-FOV > 51°. In the example, 51° < Semi-FOV < 80°, and further, 55° < Semi-FOV < 70°. By reasonably controlling the maximum field angle of the optical imaging lens, image distortion and too low illuminance can be prevented.

[0053] In an exemplary embodiment, the air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 0 < T34 / T23 < 1.5. In an example, 0.2 < T34 / T23 < 0.8. Reasonably controlling the relationship between the air gap between the third lens and the fourth lens on the optical axis and the air gap between the second lens and the third lens on the optical axis can reasonably distribute the air gaps in the optical imaging lens, so as to reduce the assembly difficulty of the optical imaging lens.

[0054] In an exemplary embodiment, the combined focal length f234 of the second lens, the third lens and the fourth lens and the total effective focal length f of the optical imaging lens satisfy: 1 ≤ f234 / f < 2.5. In an example, 1 ≤ f234 / f < 2, and further, 1 ≤ f234 / f < 1.6. Reasonably controlling the relationship between the combined focal length of the second lens, the third lens and the fourth lens and the total effective focal length of the optical imaging lens can help improve the field angle of the optical imaging lens.

[0055] In an exemplary embodiment, the central thickness CT4 of the fourth lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 1.53 < CT4 / CT3 < 3.6. In an example, 2 < CT4 / CT3 < 3.1. Reasonably controlling the relationship between the central thicknesses of the third lens and the fourth lens on the optical axis can enable the optical imaging lens to obtain sufficient spacing space and higher surface freedom, while enhancing the ability of the optical imaging lens to correct field curvature and astigmatism.

[0056] In an exemplary embodiment, the entrance pupil diameter EPD of the optical imaging lens and the effective focal length f1 of the first lens satisfy: -1.5mm 2 <EPD×f1 < 0mm 2 . In an example, -0.8mm 2 <EPD×f1 < -0.5mm 2 . Reasonably controlling the optical power of the first lens is beneficial to improving the imaging performance of the lens.

[0057] In an exemplary embodiment, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -1.5 < f2 / f3 < 0. In an example, -1 < f2 / f3 < 0, and further, -0.8 < f2 / f3 < 0. Reasonably controlling the relationship between the effective focal lengths of the second lens and the third lens can reasonably distribute the light angles of the optical imaging lens and effectively improve the aberration of the optical imaging lens.

[0058] In an exemplary embodiment, the sum ΣCT of the central thicknesses of the first lens to the fourth lens on the optical axis respectively and the sum ΣAT of the air gaps on the optical axis between any two adjacent lenses among the first lens to the fourth lens satisfy: 1 mm 2 <ΣCT×ΣAT<3 mm 2 . In an example, 1.5 mm 2 <ΣCT×ΣAT<3 mm 2 , and further, 1.8 mm 2 ≤ΣCT×ΣAT<2.1 mm 2 . Reasonably controlling the relationship between the sum of the central thicknesses of the first lens to the fourth lens on the optical axis respectively and the sum of the air gaps on the optical axis between any two adjacent lenses among the first lens to the fourth lens can reduce the size of the optical imaging lens, avoid the optical imaging lens from being too large in volume, and reduce the assembly difficulty of the optical imaging lens, achieving a high space utilization rate.

[0059] In an exemplary embodiment, the radius of curvature R2 of the image side of the first lens and the radius of curvature R3 of the object side of the second lens satisfy: 0 < R2 / R3 < 1.6. In an example, 0 < R2 / R3 < 1, and further, 0.3 < R2 / R3 ≤ 0.9. Reasonably controlling the relationship between the radius of curvature of the image side of the first lens and the radius of curvature of the object side of the second lens can effectively balance the astigmatism of the optical imaging lens, reduce the back focal length of the optical imaging lens, and ensure the miniaturization of the optical imaging lens.

[0060] In an exemplary embodiment, the radius of curvature R8 of the image side of the fourth lens and the effective focal length f4 of the fourth lens satisfy: -3 < R8 / f4 < 0. In an example, -2.5 < R8 / f4 < -0.5. Reasonably controlling the relationship between the radius of curvature of the image side of the fourth lens and the effective focal length of the fourth lens can make the optical imaging lens have better aberration balance and is also beneficial to improving the resolution of the optical imaging lens.

[0061] In an exemplary embodiment, the maximum effective radius DT31 of the object side of the third lens and the maximum effective radius DT21 of the object side of the second lens satisfy: 1 < DT31 / DT21 < 2. In an example, 1.3 < DT31 / DT21 < 1.8, and further, 1.3 < DT31 / DT21 < 1.6. Reasonably controlling the relationship between the maximum effective radius of the object side of the third lens and the maximum effective radius of the object side of the second lens can reduce the assembly difficulty of the optical imaging lens and ensure that the optical imaging lens has small aberrations.

[0062] In an exemplary embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 1 < ET1 / CT1 + ET2 / CT2 < 3. In an example, 1.5 < ET1 / CT1 + ET2 / CT2 < 2.6. By reasonably controlling the mutual relationship among the edge thickness of the first lens, the edge thickness of the second lens, the central thickness of the first lens on the optical axis, and the central thickness of the second lens on the optical axis, the air gap in the optical imaging lens can be reasonably allocated, which is conducive to the assembly of the optical imaging lens.

[0063] In an exemplary embodiment, the Abbe number V1 of the first lens, the Abbe number V2 of the second lens, and the Abbe number V4 of the fourth lens satisfy: V1 = V2 = V4. By reasonably controlling the mutual relationship among the first lens, the second lens, and the fourth lens, it is helpful for chromatic aberration correction.

[0064] In an exemplary embodiment, the edge thickness ET4 of the fourth lens and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0 < ET4 / CT4 < 0.8. In an example, 0.3 < ET4 / CT4 < 0.8, 0.3 < ET4 / CT4 < 0.5. By reasonably controlling the mutual relationship between the edge thickness and the central thickness of the fourth lens, it is helpful for the injection molding of the fourth lens.

[0065] In an exemplary embodiment, the above optical imaging lens may further include an aperture to improve the relative illuminance of the optical imaging lens. The aperture can be set at an appropriate position according to actual needs. For example, the aperture can be set between the first lens and the second lens. Optionally, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0066] This application proposes an optical imaging lens that can maintain good optical performance while increasing the field of view. The optical imaging lens according to the above embodiment of this application can adopt multiple lenses, such as the four described above. By reasonably allocating the optical power, surface type, curvature radius, central thickness, edge thickness, etc. of each lens, the incident light can be effectively converged, the optical total length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, making the optical imaging lens more conducive to production and processing.

[0067] In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the fourth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that 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 adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, and the fourth lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, and the fourth lens are all aspherical mirror surfaces.

[0068] However, those skilled in the art will appreciate that the number of lenses comprising the optical imaging lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while the embodiments describe four lenses as an example, the optical imaging lens is not limited to four lenses. If desired, the optical imaging lens may also include other numbers of lenses.

[0069] Specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0070] Example 1

[0071] The following reference Figures 1 to 2D The optical imaging lens according to Example 1 of the present application is described. Figure 1 2 is a schematic structural diagram of an optical imaging lens according to Example 1 of the present application.

[0072] like Figure 1 As shown, the optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0073] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0074] Table 1 shows the basic parameters of the optical imaging lens of Example 1, wherein the units of curvature radius, thickness and focal length are all millimeters (mm).

[0075]

[0076]

[0077] Table 1

[0078] In this embodiment, the total effective focal length of the optical imaging lens is f = 1.13 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 3.78 mm, half the diagonal length of the effective pixel area on the imaging surface S11 is ImgH = 1.89 mm, half the maximum field of view (Semi-FOV) of the optical imaging lens is 66°, and the aperture factor Fno is 2.27.

[0079] In Example 1, the object-side surface and the image-side surface of any lens among the first lens E1 to the fourth lens E4 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0080]

[0081] in, x is the distance vector height from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below lists the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A50, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 and A 24 .

[0082]

[0083] Table 2

[0084] Figure 2A The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 2B The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 2CThe distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figure 2D The chromatic aberration curve of the optical imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 2A to 2D It can be seen that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0085] Example 2

[0086] The following reference Figures 3 to 4D The optical imaging lens according to Example 2 of the present application is described. Figure 3 A schematic structural diagram of an optical imaging lens according to Example 2 of the present application is shown.

[0087] like Figure 3 As shown, the optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0088] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0089] In this embodiment, the total effective focal length of the optical imaging lens is f = 0.81 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 3.90 mm, half the diagonal length of the effective pixel area on the imaging surface S11 is ImgH = 1.79 mm, half the maximum field of view (Semi-FOV) of the optical imaging lens is 60.73°, and the aperture factor Fno is 2.30.

[0090] Table 3 shows the basic parameters of the optical imaging lens of Example 2, wherein the units of the curvature radius, thickness and focal length are all millimeters (mm).

[0091]

[0092] Table 3

[0093] In Example 2, the object side surface and the image side surface of any lens from the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 4 below lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 and A 24 .

[0094]

[0095] Table 4

[0096] Figure 4A The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 4B The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 4C The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figure 4D The chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 4A to 4D It can be seen that the optical imaging lens provided in Example 2 can achieve good imaging quality.

[0097] Example 3

[0098] The following reference Figures 5 to 6D The optical imaging lens according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging lens according to Example 3 of the present application is shown.

[0099] like Figure 5 As shown, the optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0100] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0101] In this embodiment, the total effective focal length of the optical imaging lens is f = 0.81 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 3.90 mm, half the diagonal length of the effective pixel area on the imaging surface S11 is ImgH = 1.89 mm, half the maximum field of view of the optical imaging lens is Semi-FOV = 62.82°, and the aperture coefficient Fno is 2.30.

[0102] Table 5 shows the basic parameters of the optical imaging lens of Example 3, wherein the units of curvature radius, thickness and focal length are all millimeters (mm).

[0103]

[0104] Table 5

[0105] In Example 3, the object side surface and the image side surface of any lens from the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 6 below lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 and A 24 .

[0106]

[0107] Table 6

[0108] Figure 6A The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 6B The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 6C The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion values ​​corresponding to different field angles. Figure 6DThe 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 lens. 6A to 6D It can be seen that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0109] Example 4

[0110] The following reference Figures 7 to 8D An optical imaging lens according to Example 4 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging lens according to Example 4 of the present application is shown.

[0111] like Figure 7 As shown, the optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0112] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0113] In this embodiment, the total effective focal length of the optical imaging lens is f = 0.82 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 3.90 mm, half the diagonal length of the effective pixel area on the imaging surface S11 is ImgH = 1.89 mm, half the maximum field of view of the optical imaging lens is Semi-FOV = 62.52°, and the aperture coefficient Fno is 2.30.

[0114] Table 7 shows the basic parameters of the optical imaging lens of Example 4, where the units of curvature radius, thickness and focal length are all millimeters (mm).

[0115]

[0116]

[0117] Table 7

[0118] In Example 4, the object side surface and the image side surface of any lens from the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 8 below lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 and A 24 .

[0119]

[0120] Table 8

[0121] Figure 8A The axial chromatic aberration curve of the optical imaging lens of Example 4 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 8B The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 8C The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion values ​​corresponding to different field angles. Figure 8D The 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 lens. Figures 8A to 8D It can be seen that the optical imaging lens provided in Example 4 can achieve good imaging quality.

[0122] Example 5

[0123] The following reference Figures 9 to 10D The optical imaging lens according to Example 5 of the present application is described. Figure 9 A schematic structural diagram of an optical imaging lens according to Example 5 of the present application is shown.

[0124] like Figure 9 As shown, the optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0125] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0126] In this embodiment, the total effective focal length of the optical imaging lens is f = 0.83 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 3.90 mm, half the diagonal length of the effective pixel area on the imaging surface S11 is ImgH = 1.79 mm, half the maximum field of view (Semi-FOV) of the optical imaging lens is 60°, and the aperture coefficient Fno is 2.27.

[0127] Table 9 shows the basic parameters of the optical imaging lens of Example 5, where the units of curvature radius, thickness and focal length are all millimeters (mm).

[0128]

[0129] Table 9

[0130] In Example 5, the object side surface and the image side surface of any lens from the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 10 below lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 and A 24 .

[0131]

[0132] Table 10

[0133] Figure 10A The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 10B The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 10C The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figure 10DThe chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 10A to 10D It can be seen that the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0134] Example 6

[0135] The following reference Figures 11 to 12D The optical imaging lens according to Example 6 of the present application is described. Figure 11 A schematic structural diagram of an optical imaging lens according to Example 6 of the present application is shown.

[0136] like Figure 11 As shown, the optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0137] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0138] In this embodiment, the total effective focal length of the optical imaging lens is f = 0.82 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 3.87 mm, half the diagonal length of the effective pixel area on the imaging surface S11 is ImgH = 1.61 mm, half the maximum field of view (Semi-FOV) of the optical imaging lens is 56.21°, and the aperture factor Fno is 2.27.

[0139] Table 11 shows the basic parameters of the optical imaging lens of Example 6, where the units of curvature radius, thickness and focal length are all millimeters (mm).

[0140]

[0141] Table 11

[0142] In Example 6, the object side surface and the image side surface of any lens from the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 12 below lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A14 、A 16 、A 18 、A 20 、A 22 and A 24 .

[0143]

[0144]

[0145] Table 12

[0146] Figure 12A The axial chromatic aberration curve of the optical imaging lens of Example 6 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 12B The astigmatism curve of the optical imaging lens of Example 6 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 12C The distortion curve of the optical imaging lens of Example 6 is shown, which represents the distortion values ​​corresponding to different field angles. Figure 12D The chromatic aberration curve of the optical imaging lens of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 12A to 12D It can be seen that the optical imaging lens provided in Example 6 can achieve good imaging quality.

[0147] Example 7

[0148] The following reference Figures 13 to 14D An optical imaging lens according to Example 7 of the present application is described. Figure 13 A schematic structural diagram of an optical imaging lens according to Example 7 of the present application is shown.

[0149] like Figure 13 As shown, the optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0150] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0151] In this embodiment, the total effective focal length of the optical imaging lens is f = 0.80 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 3.90 mm, half the diagonal length of the effective pixel area on the imaging surface S11 is ImgH = 1.89 mm, half the maximum field of view of the optical imaging lens is Semi-FOV = 64.89°, and the aperture coefficient Fno is 2.27.

[0152] Table 13 shows the basic parameters of the optical imaging lens of Example 7, where the units of curvature radius, thickness and focal length are all millimeters (mm).

[0153]

[0154]

[0155] Table 13

[0156] In Example 7, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 14 below lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 and A 24 .

[0157]

[0158] Table 14

[0159] Figure 14A The axial chromatic aberration curve of the optical imaging lens of Example 7 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 14B The astigmatism curve of the optical imaging lens of Example 7 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 14C The distortion curve of the optical imaging lens of Example 7 is shown, which represents the distortion values ​​corresponding to different field angles. Figure 14D The chromatic aberration curve of the optical imaging lens of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 14A to 14D It can be seen that the optical imaging lens provided in Example 7 can achieve good imaging quality.

[0160] Example 8

[0161] The following reference Figures 15 to 16DThe optical imaging lens according to Example 8 of the present application is described. Figure 15 A schematic structural diagram of an optical imaging lens according to Example 8 of the present application is shown.

[0162] like Figure 15 As shown, the optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0163] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0164] In this embodiment, the total effective focal length of the optical imaging lens is f = 0.81 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 3.90 mm, half the diagonal length of the effective pixel area on the imaging surface S11 is ImgH = 1.89 mm, half the maximum field of view (Semi-FOV) of the optical imaging lens is 63.75°, and the aperture coefficient Fno is 2.27.

[0165] Table 15 shows the basic parameters of the optical imaging lens of Example 8, where the units of curvature radius, thickness and focal length are all millimeters (mm).

[0166]

[0167] Table 15

[0168] In Example 8, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 16 below lists the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 and A 24 .

[0169]

[0170] Table 16

[0171] Figure 16A The axial chromatic aberration curve of the optical imaging lens of Example 8 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 16B The astigmatism curve of the optical imaging lens of Example 8 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 16C The distortion curve of the optical imaging lens of Example 8 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figure 16D The chromatic aberration curve of the optical imaging lens of Example 8 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 16A to 16D It can be seen that the optical imaging lens provided in Example 8 can achieve good imaging quality.

[0172] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 17.

[0173] Conditional formula / Example 1 2 3 4 5 6 7 8 CT1 / CT4 0.76 0.39 0.37 0.37 0.65 0.64 0.33 0.36 T34 / T23 0.74 0.59 0.50 0.48 0.28 0.28 0.24 0.33 f234 / f 1.00 1.44 1.44 1.42 1.33 1.34 1.58 1.51 CT4 / CT3 2.47 2.59 2.67 2.67 2.60 2.62 3.07 2.76 EPD×f1 -0.78 -0.53 -0.53 -0.54 -0.57 -0.55 -0.50 -0.53 f2 / f3 -0.73 -0.01 -0.02 -0.01 -0.03 -0.01 -0.65 -0.61 ΣCT×ΣAT 1.80 1.96 1.99 1.98 1.99 1.96 2.07 2.05 R2 / R3 0.38 0.90 0.87 0.89 0.59 0.58 0.63 0.54 R8 / f4 -2.24 -0.75 -0.84 -0.80 -0.55 -0.54 -0.55 -0.55 DT31 / DT21 1.57 1.40 1.39 1.36 1.56 1.51 1.39 1.46 ET1 / CT1+ET2 / CT2 1.67 2.59 2.54 2.53 1.88 1.85 2.56 2.54 ET4 / CT4 0.47 0.39 0.37 0.37 0.43 0.47 0.33 0.36

[0174] Table 17

[0175] The present application also provides an imaging device, wherein the electronic photosensitive element thereof may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0176] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the present application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that: It includes in sequence from the object side to the image side along the optical axis: A first lens with negative optical power, whose object side is convex and image side is concave; A second lens with positive optical power, whose object side is convex; A third lens with negative optical power; and A fourth lens with positive optical power, whose image side is convex; where 66° ≥ Semi - FOV > 51°; 0.3 < CT1 / CT4 < 0.8, and 1.8mm 2 ≤ΣCT×ΣAT<2.1mm 2 ; where Semi - FOV is half of the maximum field angle of the optical imaging lens, CT1 is the central thickness of the first lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, ΣCT is the sum of the central thicknesses of the first lens to the fourth lens respectively on the optical axis, and ΣAT is the sum of the air gaps on the optical axis between any two adjacent lenses from the first lens to the fourth lens; The number of lenses with optical power in the optical imaging lens is four.

2. The optical imaging lens according to claim 1, wherein: The air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 0.2 < T34 / T23 ≤ 0.

74.

3. The optical imaging lens according to claim 1, wherein: The combined focal length f234 of the second lens, the third lens and the fourth lens and the total effective focal length f of the optical imaging lens satisfy: 1 ≤ f234 / f < 1.

6.

4. The optical imaging lens according to claim 1, wherein: The central thickness CT4 of the fourth lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 2.47 ≤ CT4 / CT3 < 3.

1.

5. The optical imaging lens according to claim 1, wherein: The entrance pupil diameter EPD of the optical imaging lens and the effective focal length f1 of the first lens satisfy: -0.8mm 2 <EPD×f1≤-0.50mm 2 。 6. The optical imaging lens according to claim 1, wherein: The effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: - 0.73 ≤ f2 / f3 < 0.

7. The optical imaging lens according to claim 1, wherein: The radius of curvature R2 of the image side of the first lens and the radius of curvature R3 of the object side of the second lens satisfy: 0.38 ≤ R2 / R3 ≤ 0.

9.

8. The optical imaging lens according to claim 1, wherein: The radius of curvature R8 of the image side of the fourth lens and the effective focal length f4 of the fourth lens satisfy: - 2.24 ≤ R8 / f4 < - 0.

5.

9. The optical imaging lens according to claim 1, wherein: The maximum effective radius DT31 of the object side of the third lens and the maximum effective radius DT21 of the object side of the second lens satisfy: 1.36 ≤ DT31 / DT21 < 1.

6.

10. The optical imaging lens according to claim 1, wherein: The edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1.67 ≤ ET1 / CT1 + ET2 / CT2 < 2.

6.

11. The optical imaging lens according to claim 1, wherein: The Abbe number V1 of the first lens, the Abbe number V2 of the second lens and the Abbe number V4 of the fourth lens satisfy: V1 = V2 = V4.

12. The optical imaging lens according to claim 1, wherein: The edge thickness ET4 of the fourth lens and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0.3 < ET4 / CT4 < 0.

5.

13. The optical imaging lens according to any one of claims 1 to 12, wherein: It further includes: An aperture, located between the first lens and the second lens.

Images