Optical imaging lens

Abstract

The present application discloses an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens and a fourth lens with optical focal power; the total effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: 2.0<f1 / f<6.5; and the center thickness CT3 of the third lens on the optical axis and the edge thickness ET3 of the third lens satisfy: 2.5<CT3 / ET3<4.0.

Description

Technical Field

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

[0002] As people's requirements for the camera function of portable electronic products such as mobile phones continue to increase, the camera function of mobile phones has become more and more perfect. The camera on the mobile phone has also gradually developed from the initial single camera to dual cameras, triple cameras, quad cameras and even penta cameras. Obviously, the camera function of mobile phones has become one of the core competitive points of mobile phone manufacturers.

[0003] In order to meet the market development needs of portable electronic products such as mobile phones, the imaging lenses installed in portable electronic products need to use as few lenses as possible to shorten the overall length of the lens. However, this reduces the design freedom, making it difficult for the imaging lenses to meet the imaging quality requirements. Summary of the invention

[0004] On one hand, 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, a second lens, a third lens and a fourth lens with optical power; the total effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens can satisfy: 2.0<f1 / f<6.5, and the center thickness CT3 of the third lens on the optical axis and the edge thickness ET3 of the third lens can satisfy: 2.5<CT3 / ET3<4.0.

[0005] In one embodiment, there is at least one aspherical mirror surface from the object side surface of the first lens to the image side surface of the fourth lens.

[0006] In one embodiment, half of the maximum field of view Semi-FOV of the optical imaging lens may satisfy: Semi-FOV ≥ 45°.

[0007] In one embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the center thickness CT1 of the first lens on the optical axis may satisfy: 1.0<DT11 / CT1<1.5.

[0008] In one embodiment, the distance TTL from the object side of the first lens to the imaging plane of the optical imaging lens on the optical axis and half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens ImgH may satisfy: 1.4<TTL / ImgH<2.0.

[0009] In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens element and the total effective focal length f of the optical imaging lens may satisfy: 0<R7 / f≤0.7.

[0010] In one embodiment, the effective focal length f3 of the third lens and the total effective focal length f of the optical imaging lens may satisfy: 0.5<f3 / f<1.0.

[0011] In one embodiment, a distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the effective radius vertex of the image side surface of the third lens on the optical axis and a curvature radius R6 of the image side surface of the third lens may satisfy: 0.5<SAG32 / R6<1.0.

[0012] In one embodiment, a curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens may satisfy: 0.5<R3 / R4<1.5.

[0013] In one embodiment, the sum ΣAT of the spacing distances between any two adjacent lenses from the first lens to the fourth lens on the optical axis may satisfy: ΣAT≤0.65 mm.

[0014] In one embodiment, the combined focal length f123 of the first lens, the second lens, and the third lens and the total effective focal length f of the optical imaging lens may satisfy: 0.5<f123 / f<1.0.

[0015] In one embodiment, the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy: f / EPD≤2.20.

[0016] In one embodiment, a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT4 of the fourth lens on the optical axis may satisfy: 1.0<CT3 / (CT2+CT4)<2.0.

[0017] On the other hand, the present application provides such an optical imaging lens. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, and a fourth lens with optical focal power; the maximum effective radius DT11 of the object side surface of the first lens and the center thickness CT1 of the first lens on the optical axis can satisfy: 1.0<DT11 / CT1<1.5; and the distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the effective radius vertex of the image side surface of the third lens on the optical axis and the curvature radius R6 of the image side surface of the third lens can satisfy: 0.5<SAG32 / R6<1.0.

[0018] The present application adopts four lenses, and through the reasonable allocation of the optical focal length, surface shape, center thickness of each lens and axial spacing between each lens, the above-mentioned optical imaging lens has at least one beneficial effect of ultra-thinness, high resolution, high imaging quality, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown;

[0021] Figure 2A and Figure 2B axial chromatic aberration curve and astigmatism curve of the optical imaging lens of Example 1 are respectively shown;

[0022] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown;

[0023] Figure 4A and Figure 4B axial chromatic aberration curve and astigmatism curve of the optical imaging lens of Example 2 are respectively shown;

[0024] Figure 5 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown;

[0025] Fig. 6A and Figure 6B axial chromatic aberration curve and astigmatism curve of the optical imaging lens of Example 3 are respectively shown;

[0026] Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown;

[0027] Fig. 8A and Figure 8B axial chromatic aberration curve and astigmatism curve of the optical imaging lens of Example 4 are respectively shown;

[0028] Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application is shown;

[0029] Fig. 10A and Fig. 10B axial chromatic aberration curve and astigmatism curve of the optical imaging lens of Example 5 are respectively shown;

[0030] Fig.11 A schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application is shown; and

[0031] Fig. 12A and Fig. 12B The axial chromatic aberration curve and the astigmatism curve of the optical imaging lens of Example 6 are respectively shown. DETAILED DESCRIPTION

[0032] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only 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.

[0033] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0034] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0035] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0036] 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 exclude 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 listed 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.

[0037] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] The features, principles and other aspects of the present application are described in detail below.

[0040] The optical imaging lens according to the exemplary embodiment of the present application may include, for example, four lenses with optical power, namely, a first lens, a second lens, a third lens, and a fourth lens. The four lenses are arranged in sequence from the object side to the image side along the optical axis. Any two adjacent lenses from the first lens to the fourth lens may have a spacing distance between them.

[0041] In exemplary embodiments, the first lens may have positive or negative power; the second lens may have positive or negative power; the third lens may have positive or negative power; and the fourth lens may have positive or negative power.

[0042] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: Semi-FOV ≥ 45°, where Semi-FOV is half of the maximum field of view of the optical imaging lens. More specifically, Semi-FOV may further satisfy: Semi-FOV ≥ 49°. Satisfying Semi-FOV ≥ 45° is conducive to obtaining a larger field of view range, so that the optical imaging lens has a wider imaging range.

[0043] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 2.0<f1 / f<6.5, where f is the total effective focal length of the optical imaging lens, and f1 is the effective focal length of the first lens. More specifically, f1 and f may further satisfy: 2.2<f1 / f<6.5. Satisfying 2.0<f1 / f<6.5 causes the first lens to generate negative spherical aberration, which in turn balances the positive spherical aberration generated by other lenses of the optical imaging lens, so that the optical imaging lens has good imaging quality.

[0044] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.0<DT11 / CT1<1.5, wherein DT11 is the maximum effective radius of the object side of the first lens, and CT1 is the center thickness of the first lens on the optical axis. Satisfying 1.0<DT11 / CT1<1.5 can make the optical imaging lens have the characteristic of a small head, thereby making the lens of portable electronic products such as mobile phones more beautiful.

[0045] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.4<TTL / ImgH<2.0, wherein TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging lens on the optical axis, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens. More specifically, TTL and ImgH may further satisfy: 1.4<TTL / ImgH<1.9. Satisfying 1.4<TTL / ImgH<2.0 can effectively shorten the overall size of the lens, realize the ultra-thin characteristics of the lens group, and avoid limiting its application range due to excessive size, so that the lens group can better meet the needs.

[0046] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0<R7 / f≤0.7, where R7 is the radius of curvature of the object side of the fourth lens, and f is the total effective focal length of the optical imaging lens. More specifically, R7 and f may further satisfy: 0.5<R7 / f≤0.7. Satisfying 0<R7 / f≤0.7 is conducive to avoiding the processing difficulties caused by R7 being too small, and also avoids the imaging lens being unable to support a larger FOV due to R7 being too large.

[0047] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.5<f3 / f<1.0, where f3 is the effective focal length of the third lens, and f is the total effective focal length of the optical imaging lens. More specifically, f3 and f may further satisfy: 0.6<f3 / f<0.8. Satisfying 0.5<f3 / f<1.0 can effectively reduce the size of the system, while controlling the spherical aberration contribution of the third lens within a reasonable range, which is conducive to the system obtaining better imaging quality.

[0048] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 2.5<CT3 / ET3<4.0, wherein CT3 is the center thickness of the third lens on the optical axis, and ET3 is the edge thickness of the third lens. More specifically, CT3 and ET3 may further satisfy: 2.9<CT3 / ET3<3.7. Satisfying 2.5<CT3 / ET3<4.0 can maintain good processability of the optical imaging lens, while balancing the amount of system distortion, thereby obtaining better imaging effects.

[0049] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.5<SAG32 / R6<1.0, wherein SAG32 is the distance from the intersection of the image side surface of the third lens and the optical axis to the effective radius vertex of the image side surface of the third lens on the optical axis, and R6 is the curvature radius of the image side surface of the third lens. More specifically, SAG32 and R6 may further satisfy: 0.7<SAG32 / R6<1.0. Satisfying 0.5<SAG32 / R6<1.0 helps the system obtain a smaller Fno while avoiding the processing difficulties caused by the excessive curvature of the third lens.

[0050] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.5<R3 / R4<1.5, wherein R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens. More specifically, R3 and R4 may further satisfy: 0.9<R3 / R4<1.5. Satisfying 0.5<R3 / R4<1.5 can effectively constrain the shape of the second lens, thereby effectively controlling the aberration contribution rate of the object side surface and the image side surface of the second lens, and achieving a balance of various aberrations.

[0051] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: ∑AT≤0.65mm, where ∑AT is the sum of the distances between any two adjacent lenses from the first lens to the fourth lens on the optical axis. Satisfying ∑AT≤0.65mm can avoid excessive light deflection, which is conducive to reducing the difficulty of lens processing and assembly.

[0052] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.5<f123 / f<1.0, wherein f123 is the combined focal length of the first lens, the second lens, and the third lens, and f is the total effective focal length of the optical imaging lens. More specifically, f123 and f may further satisfy: 0.6<f123 / f<0.9. Satisfying 0.5<f123 / f<1.0 can avoid excessive concentration of system optical power, so that system aberrations can be better corrected.

[0053] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: f / EPD≤2.20, where f is the total effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens. Satisfying f / EPD≤2.20 can effectively increase the light throughput of the lens, so that the optical imaging lens has a higher relative illumination, and improves the imaging quality of the lens in a darker environment.

[0054] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.0<CT3 / (CT2+CT4)<2.0, wherein CT2 is the center thickness of the second lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis. More specifically, CT3, CT2, and CT4 may further satisfy: 1.3<CT3 / (CT2+CT4)<1.9. Satisfying 1.0<CT3 / (CT2+CT4)<2.0 can enable the optical imaging lens to better balance the system chromatic aberration, and at the same time avoid the processing difficulties caused by the excessive thickness of one of the second lens, the third lens, or the fourth lens, making the system structure distribution more reasonable.

[0055] In an exemplary embodiment, the optical imaging lens according to the present application further includes an aperture provided between the object side and the first lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface. The present application proposes an optical imaging lens having the characteristics of ultra-thinness, high definition, miniaturization, and high imaging quality. The optical imaging lens according to the above-mentioned embodiment of the present application may adopt multiple lenses, such as the four lenses described above. By reasonably allocating the optical power, surface shape, center thickness of each lens, and axial spacing between each lens, etc., the incident light can be effectively converged, the total optical length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, so that the optical imaging lens is more conducive to production and processing.

[0056] In the embodiment of the present application, 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 having 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 occurring 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.

[0057] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although four lenses are described as an example in the embodiments, the optical imaging lens is not limited to including four lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0058] Specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0059] Example 1

[0060] The following reference Figures 1 to 2B An optical imaging lens according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown.

[0061] like Figure 1 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0062] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0063] Table 1 shows the basic parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0064]

[0065] Table 1

[0066] In this example, the total effective focal length f of the optical imaging lens is 1.60 mm, the total length TTL of the optical imaging lens (i.e., the distance from the object-side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens on the optical axis) is 2.91 mm, half of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens ImgH is 1.99 mm, and half of the maximum field of view Semi-FOV of the optical imaging lens is 57.7°.

[0067] In Example 1, the object-side surface S1 of the first lens E1 to the image-side surface S8 of the fourth lens E4 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0068]

[0069] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the 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 cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives 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, 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0070] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -9.6468E-03 -3.9733E-04 -6.7023E-06 2.5686E-06 1.4748E-07 1.1937E-06 -1.8927E-06 -1.9258E-06 -1.9175E-06 S2 -6.7844E-02 3.9678E-03 -4.0090E-05 3.4002E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -1.2596E-01 9.2042E-03 1.6879E-03 -1.1578E-03 -9.9911E-05 -2.2714E-05 -5.0478E-05 -2.5938E-05 -5.9761E-06 S4 -1.5763E-01 5.9155E-03 -3.7620E-03 -1.7863E-03 -4.6201E-04 -3.8001E-04 -7.9468E-05 -2.3448E-05 8.1695E-06 S5 1.6765E-01 9.3403E-03 4.0136E-03 -3.1805E-04 -7.4632E-04 -2.7469E-04 1.4804E-04 -2.8639E-06 -4.3517E-05 S6 1.4680E-01 1.9285E-02 2.2374E-02 3.3265E-03 1.4310E-03 -5.3777E-04 -4.5581E-04 -2.9797E-04 -5.8711E-05 S7 -9.6995E-01 1.3341E-01 -1.4441E-02 5.5383E-03 -1.6218E-03 -2.1634E-03 5.0050E-05 -2.9696E-05 -2.8773E-05 S8 -8.2284E-01 1.0160E-01 -2.9286E-02 7.1527E-03 -6.1766E-03 -3.1779E-03 -1.5304E-04 -5.3999E-04 4.8761E-04

[0071] Table 2

[0072] Figure 2A The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 2B The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2A and Figure 2B It can be seen that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0073] Example 2

[0074] The following reference Figures 3 to 4B The optical imaging lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown.

[0075] like Figure 3 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0076] The first lens E1 has positive power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative power, its object side surface S7 is convex, and its image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0077] In this example, the total effective focal length f of the optical imaging lens is 2.28 mm, the total length TTL of the optical imaging lens is 4.03 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the optical imaging lens is 2.54 mm, and half of the maximum field of view Semi-FOV of the optical imaging lens is 54.7°.

[0078] Table 3 shows the basic parameters of the optical imaging lens of Example 2, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0079]

[0080] Table 3

[0081] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -5.7949E-03 -4.5478E-04 -9.5670E-05 -1.1034E-05 -2.3345E-05 -1.0391E-05 -1.3581E-05 -6.0319E-06 -6.7475E-06 S2 -1.0071E-01 -8.5803E-03 -1.4588E-03 -1.5949E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -1.7864E-01 -2.3457E-02 -5.2909E-03 -1.2367E-03 -3.7770E-04 -3.2674E-05 -3.8582E-05 -1.5095E-05 -2.0879E-05 S4 -2.1579E-01 -2.5567E-02 -3.1524E-03 -1.4397E-03 1.7488E-04 6.0286E-05 -3.5694E-05 -2.4856E-05 6.9215E-06 S5 1.0737E-01 -9.6431E-03 4.8342E-03 -4.1220E-04 5.2150E-04 -1.0825E-04 -4.3736E-05 -1.6229E-05 2.8730E-05 S6 1.9767E-01 2.3617E-02 2.0647E-02 1.6380E-03 -5.6655E-04 -1.3527E-04 8.0040E-05 1.2381E-04 1.0149E-06 S7 -9.2060E-01 8.4795E-02 -1.7837E-02 6.0006E-03 -1.1983E-03 5.0846E-04 -6.5964E-04 -2.4615E-04 -2.6990E-04 S8 -9.4178E-01 9.9016E-02 -3.7980E-02 1.2231E-02 -3.3746E-03 2.5186E-04 -1.3762E-03 -5.1242E-04 -1.5913E-04

[0082] Table 4

[0083] Figure 4A The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4B The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4A and Figure 4B It can be seen that the optical imaging lens provided in Example 2 can achieve good imaging quality.

[0084] Example 3

[0085] The following reference Figures 5 to 6B An optical imaging lens according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown.

[0086] like Figure 5As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0087] The first lens E1 has positive focal power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has positive focal power, its object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive focal power, its object side surface S5 is concave, and the image side surface S6 is convex. The fourth lens E4 has negative focal power, its object side surface S7 is convex, and the image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0088] In this example, the total effective focal length f of the optical imaging lens is 2.06 mm, the total length TTL of the optical imaging lens is 3.59 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the optical imaging lens is 2.37 mm, and half of the maximum field of view Semi-FOV of the optical imaging lens is 53.7°.

[0089] Table 5 shows the basic parameters of the optical imaging lens of Example 3, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0090]

[0091] Table 5

[0092] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.0832E-02 -4.5643E-04 -4.2432E-05 7.0834E-06 -1.2673E-05 -2.7764E-06 -7.4491E-06 -1.4842E-06 -4.0384E-06 S2 -6.1937E-02 -1.3411E-03 1.5837E-04 9.8083E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -1.3595E-01 -1.0762E-02 1.5877E-03 6.3451E-04 1.9148E-05 -2.7342E-05 -1.1491E-05 7.4352E-06 -8.3276E-07 S4 -1.5241E-01 -1.0642E-02 1.9250E-03 -5.5690E-04 -1.1988E-04 -2.5422E-05 3.7990E-05 -1.1296E-06 4.8428E-06 S5 1.4169E-01 -8.0331E-03 1.7996E-03 3.1029E-04 3.8363E-05 -1.8697E-04 1.3603E-04 -4.2682E-05 6.3823E-06 S6 1.8042E-01 1.4028E-02 1.7877E-02 8.0918E-04 2.1263E-04 -6.5535E-05 3.0236E-05 4.0484E-05 -8.0132E-06 S7 -1.0870E+00 1.1244E-01 -1.9674E-02 1.0338E-02 -2.3093E-03 -1.6597E-03 -1.8806E-03 -8.7049E-04 -3.7892E-04 S8 -1.0778E+00 1.1696E-01 -4.8774E-02 1.8131E-02 -7.9999E-03 -4.9231E-04 -2.8944E-03 -8.6913E-04 -4.2960E-04

[0093] Table 6

[0094] Fig. 6A The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6B The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig. 6A and Figure 6B It can be seen that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0095] Example 4

[0096] The following reference Figures 7 to 8B An optical imaging lens according to Embodiment 4 of the present application is described. Figure 7A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown.

[0097] like Figure 7 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0098] The first lens E1 has positive focal power, its object side surface S1 is concave, and the image side surface S2 is convex. The second lens E2 has positive focal power, its object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive focal power, its object side surface S5 is concave, and the image side surface S6 is convex. The fourth lens E4 has negative focal power, its object side surface S7 is convex, and the image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0099] In this example, the total effective focal length f of the optical imaging lens is 2.39 mm, the total length TTL of the optical imaging lens is 4.23 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the optical imaging lens is 2.45 mm, and half of the maximum field of view Semi-FOV of the optical imaging lens is 50.3°.

[0100] Table 7 shows the basic parameters of the optical imaging lens of Example 4, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0101]

[0102] Table 7

[0103]

[0104]

[0105] Table 8

[0106] Fig. 8A The axial chromatic aberration curve of the optical imaging lens of Example 4 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 8B The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig. 8A and Figure 8B It can be seen that the optical imaging lens provided in Example 4 can achieve good imaging quality.

[0107] Example 5

[0108] The following reference Figures 9 to 10B An optical imaging lens according to Embodiment 5 of the present application is described. Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application is shown.

[0109] like Fig. 9 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0110] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0111] In this example, the total effective focal length f of the optical imaging lens is 2.73 mm, the total length TTL of the optical imaging lens is 5.04 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.05 mm, and half of the maximum field of view Semi-FOV of the optical imaging lens is 54.8°.

[0112] Table 9 shows the basic parameters of the optical imaging lens of Example 5, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0113]

[0114]

[0115] Table 9

[0116] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.2928E-02 -3.7682E-04 -1.6131E-05 7.1985E-06 -4.7298E-06 1.9530E-06 -2.4347E-06 1.4859E-06 4.4488E-08 S2 -7.9651E-02 1.7207E-03 3.0885E-04 1.9610E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -1.7868E-01 -1.1883E-02 6.9913E-03 -7.8453E-04 -1.9662E-05 -3.4716E-04 -9.5241E-05 -8.5047E-05 -2.1195E-05 S4 -3.1742E-01 3.2149E-03 -3.3969E-03 -9.1639E-04 -2.6297E-04 1.1065E-05 -1.1130E-04 -3.9900E-05 -2.3110E-05 S5 9.7132E-02 6.2559E-03 4.3255E-03 -4.6256E-05 -6.8769E-04 -2.0456E-04 -3.8632E-05 -9.2944E-05 2.3395E-05 S6 3.0738E-01 1.3243E-02 3.6447E-02 3.5357E-03 2.2455E-03 -1.0551E-03 -6.4610E-05 -1.5642E-04 -4.4821E-06 S7 -9.5293E-01 8.4491E-02 1.6238E-02 -3.9581E-03 5.3492E-03 -3.7228E-03 1.8548E-03 -7.0756E-04 4.8995E-04 S8 -4.5206E+00 7.9379E-01 -2.3556E-01 8.4924E-02 -2.6840E-02 1.1004E-02 -4.0140E-03 9.3751E-04 -3.7742E-04

[0117] Table 10

[0118] Fig. 10A The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig. 10BThe astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig. 10A and Fig. 10B It can be seen that the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0119] Example 6

[0120] The following reference Figures 11 to 12B An optical imaging lens according to Embodiment 6 of the present application is described. Fig.11 A schematic structural diagram of an optical imaging lens according to Example 6 of the present application is shown.

[0121] like Fig.11 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0122] The first lens E1 has positive power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is convex, and the image side surface S6 is convex. The fourth lens E4 has negative power, its object side surface S7 is convex, and the image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0123] In this example, the total effective focal length f of the optical imaging lens is 1.72 mm, the total length TTL of the optical imaging lens is 3.15 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the optical imaging lens is 1.69 mm, and half of the maximum field of view Semi-FOV of the optical imaging lens is 49.9°.

[0124] Table 11 shows the basic parameters of the optical imaging lens of Example 6, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 12 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0125]

[0126]

[0127] Table 11

[0128] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -8.3962E-03 -4.3273E-04 -8.1568E-05 1.3488E-06 -1.0364E-05 -3.3871E-06 -6.6631E-06 -3.5021E-06 -3.9409E-06 S2 -6.2359E-02 -4.8011E-03 -1.2519E-03 -4.4485E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -1.1944E-01 -2.2540E-02 -5.8288E-03 -2.2239E-03 -6.7478E-04 -2.1700E-04 -7.3423E-05 -2.4503E-05 -9.2190E-06 S4 -2.2462E-01 -1.1946E-02 -6.8134E-03 -1.1176E-03 -4.4667E-04 -1.6033E-05 -5.1386E-05 7.6049E-06 6.1187E-06 S5 2.3906E-02 -1.7438E-03 1.0302E-03 2.7985E-04 7.2779E-05 8.3902E-05 9.5905E-06 1.6130E-05 1.5519E-05 S6 6.7669E-02 4.1588E-02 1.2852E-02 2.3058E-03 -1.1897E-03 -2.6273E-04 7.4655E-05 1.3544E-04 3.3281E-05 S7 -5.4558E-01 3.5448E-02 2.5268E-04 -7.2025E-04 1.6625E-03 -9.3401E-04 3.7476E-04 -2.0119E-04 6.3095E-05 S8 -2.6261E+00 4.4877E-01 -1.3491E-01 5.0519E-02 -1.4870E-02 6.5559E-03 -2.5184E-03 5.7537E-04 -3.9910E-04

[0129] Table 12

[0130] Fig. 12A The axial chromatic aberration curve of the optical imaging lens of Example 6 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig. 12B The astigmatism curve of the optical imaging lens of Example 6 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig. 12A and Fig. 12B It can be seen that the optical imaging lens provided in Example 6 can achieve good imaging quality.

[0131] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 13.

[0132]

[0133]

[0134] Table 13

[0135] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0136] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical imaging lens, characterized in that: The lens includes, in order from the object side to the image side along the optical axis: a first lens having positive refractive power, a second lens having positive refractive power, a third lens having positive refractive power, and a fourth lens having negative refractive power; Wherein, the object side surface of the first lens is convex or concave, and the image side surface is convex or concave; The object side surface of the second lens is convex, and the image side surface is concave; The object side surface of the third lens is convex or concave, and the image side surface is convex; The object side surface of the fourth lens is convex, and the image side surface is concave; The optical imaging lens has four lenses with optical power; The total effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: 2.29≤f1 / f≤6.41; The center thickness CT3 of the third lens on the optical axis and the edge thickness ET3 of the third lens satisfy: 2.99≤CT3 / ET3≤3.64; and Half of the maximum field of view Semi-FOV of the optical imaging lens satisfies: 49.9°≤Semi-FOV≤57.7°.

2. The optical imaging lens according to claim 1, wherein: The maximum effective radius DT11 of the object-side surface of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: 1.09≤DT11 / CT1<1.

5.

3. The optical imaging lens according to claim 1, wherein: The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH satisfy: 1.46≤TTL / ImgH<1.

9.

4. The optical imaging lens according to claim 1, wherein: The curvature radius R7 of the object-side surface of the fourth lens element and the total effective focal length f of the optical imaging lens satisfy the following: 0.5<R7 / f≤0.

7.

5. The optical imaging lens according to claim 1, wherein: The effective focal length f3 of the third lens and the total effective focal length f of the optical imaging lens satisfy: 0.67≤f3 / f<0.

8.

6. The optical imaging lens according to claim 1, wherein: A distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the effective radius vertex of the image side surface of the third lens on the optical axis and a curvature radius R6 of the image side surface of the third lens satisfy: 0.78≤SAG32 / R6<1.

0.

7. The optical imaging lens according to claim 1, wherein: A curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens satisfy: 0.9<R3 / R4<1.

5.

8. The optical imaging lens according to claim 1, wherein: The sum ∑AT of the spacing distances between any two adjacent lenses from the first lens to the fourth lens on the optical axis satisfies: 0.29 mm≤∑AT≤0.65 mm.

9. The optical imaging lens according to claim 1, wherein: The combined focal length f123 of the first lens, the second lens and the third lens and the total effective focal length f of the optical imaging lens satisfy the following: 0.69≤f123 / f<0.

9.

10. The optical imaging lens according to claim 1, wherein: The total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: 2.06≤f / EPD≤2.

20.

11. The optical imaging lens according to claim 1, wherein: A center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT4 of the fourth lens on the optical axis satisfy: 1.3<CT3 / (CT2+CT4)<1.9.

Images