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 with negative optical power, whose image side surface is a concave surface; a second lens with positive optical power; a third lens with negative optical power, whose image side surface is a concave surface; and a fourth lens with positive optical power, whose object side surface is a convex surface and image side surface is a concave surface, wherein the maximum field of view FOV of the optical imaging lens satisfies: 100°<FOV<150°; and the optical imaging lens also includes an aperture, and the distance SL from the aperture to the imaging surface of the optical imaging lens on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface on the optical axis satisfy: 1.2<TTL / SL<1.6, so that the optical imaging lens has the characteristics of high image quality, large viewing angle, etc.

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 advancement of technology, electronic products such as smart phones, tablet computers, and phone watches have become rapidly popular due to their portable features. Optical imaging lenses used in portable electronic products have higher requirements not only for their miniaturization, but also for their imaging quality.

[0003] For example, the optical imaging lenses currently used in mainstream mobile phones are usually configured as a combination lens including a large image lens, a wide-angle lens and a telephoto lens to achieve different shooting effects and meet the various needs of portable electronic products. The wide-angle lens in the above combination lens has the characteristics of a large viewing angle and a long depth of field, which can make the shooting range wider and the imaging range clearer, and thus has become one of the important lenses used in portable electronic products.

[0004] Therefore, how to make the optical imaging lens used in portable electronic products obtain clearer imaging pictures while taking into account the shooting range is a problem that needs to be solved urgently. Summary of the invention

[0005] The present application provides an optical imaging lens applicable to portable electronic products, which can at least solve or partially solve at least one of the above-mentioned shortcomings in the prior art, such as an optical imaging lens with a large viewing angle and high image quality.

[0006] One aspect of the present application provides an optical imaging lens, which may include, in order from the object side to the image side along the optical axis: a first lens with negative optical power, whose image side surface is a concave surface; a second lens with positive optical power; a third lens with negative optical power, whose image side surface is a concave surface; and a fourth lens with positive optical power, whose object side surface is a convex surface and image side surface is a concave surface; wherein the maximum field of view FOV of the optical imaging lens may satisfy: 100°<FOV<150°; and the optical imaging lens also includes an aperture, and a distance SL from the aperture to the imaging surface of the optical imaging lens on the optical axis and a distance TTL from the object side surface of the first lens to the imaging surface on the optical axis may satisfy: 1.2<TTL / SL<1.6.

[0007] In one embodiment, the effective focal length f1 of the first lens and the curvature radius R2 of the image-side surface of the first lens may satisfy: -2.1<f1 / R2<-1.6.

[0008] In one embodiment, the effective focal length f2 of the second lens, the curvature radius R3 of the object-side surface of the second lens, and the curvature radius R4 of the image-side surface of the second lens may satisfy: 1.5<f2 / (R3+R4)<2.2.

[0009] In one embodiment, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the total effective focal length f of the optical imaging lens may satisfy: 1.0<(f3+f4) / f<1.5.

[0010] In one embodiment, a curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens may satisfy: 5.5<(R8+R7) / (R8-R7)<6.5.

[0011] 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<CT2 / (CT3+CT4)<1.4.

[0012] In one embodiment, an air interval T12 between half of the diagonal length ImgH of the effective pixel area on the imaging plane and the first lens and the second lens on the optical axis may satisfy: 0.2<T12 / ImgH<0.6.

[0013] In one embodiment, the maximum effective radius DT22 of the image-side surface of the second lens and the maximum effective radius DT42 of the image-side surface of the fourth lens may satisfy: 2.2<DT42 / DT22<2.7.

[0014] In one embodiment, the combined focal length f23 of the second lens and the third lens and the total effective focal length f of the optical imaging lens may satisfy: 1.0<f23 / f<1.5.

[0015] In one embodiment, the on-axis distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens and the on-axis distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens may satisfy: -1.9<SAG12 / SAG22<-1.3.

[0016] In one embodiment, an edge thickness ET2 of the second lens and an edge thickness ET3 of the third lens may satisfy: 0.7<ET2 / ET3<1.3.

[0017] Another aspect of the present application provides an optical imaging lens, which may include, in order from the object side to the image side along the optical axis: a first lens with negative optical power, whose image side surface is a concave surface; a second lens with positive optical power; a third lens with negative optical power, whose image side surface is a concave surface; and a fourth lens with positive optical power, whose object side surface is a convex surface and image side surface is a concave surface, wherein the effective focal length f1 of the first lens and the curvature radius R2 of the image side surface of the first lens may satisfy: -2.1<f1 / R2<-1.6.

[0018] In one embodiment, the maximum field of view FOV of the optical imaging lens satisfies: 100°<FOV<150°.

[0019] In one embodiment, the effective focal length f2 of the second lens, the curvature radius R3 of the object-side surface of the second lens, and the curvature radius R4 of the image-side surface of the second lens may satisfy: 1.5<f2 / (R3+R4)<2.2.

[0020] In one embodiment, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the total effective focal length f of the optical imaging lens may satisfy: 1.0<(f3+f4) / f<1.5.

[0021] In one embodiment, a curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens may satisfy: 5.5<(R8+R7) / (R8-R7)<6.5.

[0022] 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<CT2 / (CT3+CT4)<1.4.

[0023] In one embodiment, an air gap T12 between half of the diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging lens and the first lens and the second lens on the optical axis may satisfy: 0.2<T12 / ImgH<0.6.

[0024] In one embodiment, the maximum effective radius DT22 of the image-side surface of the second lens and the maximum effective radius DT42 of the image-side surface of the fourth lens may satisfy: 2.2<DT42 / DT22<2.7.

[0025] In one embodiment, the optical imaging lens further includes an aperture, wherein a distance SL from the aperture to the imaging plane on the optical axis and a distance TTL from the object side surface of the first lens to the imaging plane on the optical axis may satisfy: 1.2<TTL / SL<1.6.

[0026] In one embodiment, the combined focal length f23 of the second lens and the third lens and the total effective focal length f of the optical imaging lens may satisfy: 1.0<f23 / f<1.5.

[0027] In one embodiment, the on-axis distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens and the on-axis distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens may satisfy: -1.9<SAG12 / SAG22<-1.3.

[0028] In one embodiment, an edge thickness ET2 of the second lens and an edge thickness ET3 of the third lens may satisfy: 0.7<ET2 / ET3<1.3.

[0029] The optical imaging lens provided in the present application uses multiple lenses, such as the first lens to the fourth lens. By reasonably controlling the maximum field angle of the optical imaging system and optimizing the optical focal length and surface shape of each lens, the optical imaging lens has high imaging quality while achieving a large field angle. At the same time, each lens in the optical imaging lens has a compact structure and good molding and processing performance, which can make the optical imaging lens have a high manufacturing yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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:

[0031] Figure 1 A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown;

[0032] FIG. 2A to FIG. 2D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of Example 1 are respectively shown;

[0033] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown;

[0034] FIG. 4A to FIG. 4D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of Example 2 are respectively shown;

[0035] Figure 5 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown;

[0036] FIG. 6A to FIG. 6D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of Example 3 are respectively shown;

[0037] Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown;

[0038] FIG. 8A to FIG. 8D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of Example 4 are respectively shown;

[0039] Fig. 9 shows a schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application; and

[0040] FIG. 10A to FIG. 10D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of Example 5 are respectively shown. DETAILED DESCRIPTION

[0041] 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.

[0042] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0043] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The features, principles and other aspects of the present application are described in detail below.

[0049] The optical imaging lens according to the 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. The four lenses are arranged in sequence from the object side to the image side along the optical axis. In the first lens to the fourth lens, each adjacent two lenses may have an air gap between them.

[0050] In an exemplary embodiment, the first lens may have a negative optical power, and its image side surface may be a concave surface; the second lens may have a positive optical power; the third lens may have a negative optical power, and its image side surface may be a concave surface; and the fourth lens may have a positive optical power, and its object side surface may be a convex surface, and its image side surface may be a concave surface. By controlling the optical power and surface shape of the first lens, it is helpful to reduce the inclination angle of the incident light entering the optical imaging lens, so that the optical imaging lens has a larger field of view angle range; by controlling the optical power and surface shape of the second lens and the third lens, it is helpful to correct the off-axis aberration of the optical imaging system and improve the imaging quality of the optical imaging lens; by controlling the optical power and surface shape of the fourth lens, the tolerance sensitivity of the optical imaging system can be effectively reduced and the maximum field of view of the optical imaging system can be further improved, so that the optical imaging lens has a better object information collection capability.

[0051] In example embodiments, the object-side surface of the second lens may be a convex surface, and the image-side surface thereof may be a convex surface.

[0052] In an exemplary embodiment, the maximum field of view FOV of the optical imaging lens may satisfy: 100°<FOV<150°. By controlling the maximum field of view of the optical imaging lens within a reasonable numerical range, the optical imaging lens is advantageously capable of obtaining a larger field of view, a wider imaging range, and a larger and clearer imaging picture.

[0053] In an exemplary embodiment, the effective focal length f1 of the first lens and the curvature radius R2 of the image side surface of the first lens may satisfy: -2.1<f1 / R2<-1.6. By controlling the ratio of the effective focal length of the first lens to the curvature radius of the image side surface of the first lens within a reasonable numerical range, the optical imaging lens may not have excessive aberrations when achieving a large field of view; at the same time, the tolerance sensitivity of the first lens may be effectively reduced to ensure the manufacturing yield of the optical imaging lens.

[0054] In an exemplary embodiment, the effective focal length f2 of the second lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens may satisfy: 1.5<f2 / (R3+R4)<2.2. By properly controlling the relationship between the effective focal length of the second lens, the curvature radius of the object side surface of the second lens, and the curvature radius of the image side surface of the second lens, the astigmatism value and the coma value of the second lens may be controlled within a reasonable numerical range, and the astigmatism and coma generated by the first lens may be effectively balanced, so that the optical imaging lens has better imaging quality.

[0055] In an exemplary embodiment, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the total effective focal length f of the optical imaging lens may satisfy: 1.0<(f3+f4) / f<1.5. For example, 1.1<(f3+f4) / f<1.4. Reasonable control of the relationship between the effective focal length of the third lens, the effective focal length of the fourth lens, and the total effective focal length of the optical imaging lens can ensure that the optical imaging system has a high aberration correction capability while keeping the optical imaging system small in size.

[0056] In an exemplary embodiment, the curvature radius R7 of the object-side surface of the fourth lens and the curvature radius R8 of the image-side surface of the fourth lens may satisfy: 5.5<(R8+R7) / (R8-R7)<6.5. For example, 5.7<(R8+R7) / (R8-R7)<6.3. By controlling the ratio of the curvature radius of the object-side surface and the image-side surface of the fourth lens within a reasonable numerical range, the configuration of the optical imaging lens can be optimized, which is beneficial to correcting the aberration and chromatic aberration of the optical imaging lens.

[0057] In an exemplary embodiment, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, and the center thickness CT4 of the fourth lens on the optical axis may satisfy: 1.0<CT2 / (CT3+CT4)<1.4. Reasonable control of the relationship between the center thicknesses of the second lens, the third lens, and the fourth lens on the optical axis can effectively improve the stray light generated by the third lens, and improve the illumination of the imaging surface of the optical imaging lens on the basis of comprehensively improving the ghost image generated by the stray light; it can reduce the sensitivity of the optical imaging system, optimize the configuration of the optical imaging lens, and improve the manufacturing yield of the optical imaging lens.

[0058] In an exemplary embodiment, half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens ImgH and the air interval T12 between the first lens and the second lens on the optical axis may satisfy: 0.2<T12 / ImgH<0.6. By controlling the ratio of half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens to the air interval between the first lens and the second lens on the optical axis within a reasonable numerical range, it is beneficial to increase the field angle of the combined structure including the first lens and the second lens, improve the angular magnification, and enable the optical imaging lens to present clearer object details. At the same time, it is beneficial to increase the full field angle of the optical imaging lens, so that more shooting space can be obtained when shooting in telephoto mode.

[0059] In an exemplary embodiment, the maximum effective radius DT22 of the image side surface of the second lens and the maximum effective radius DT42 of the image side surface of the fourth lens may satisfy: 2.2<DT42 / DT22<2.7. By controlling the ratio of the maximum effective radius of the image side surface of the second lens to that of the fourth lens within a reasonable numerical range, the size of the second lens and the fourth lens can be effectively prevented from being too large, so as to avoid processing difficulties caused by too large an inclination angle of the incident light, and at the same time, the processability of the optical imaging lens can be improved, the manufacturing yield of the optical imaging lens can be improved, and assembly risks can be avoided.

[0060] In an exemplary embodiment, the optical imaging lens further includes an aperture, wherein the distance SL from the aperture to the imaging plane on the optical axis and the distance TTL from the object side of the first lens to the imaging plane on the optical axis can satisfy: 1.2<TTL / SL<1.6. By controlling the ratio of the distance from the aperture to the imaging plane to the distance from the object side of the first lens to the imaging plane on the optical axis within a reasonable numerical range, the light flux of the optical imaging lens can be effectively increased, so that the optical imaging lens has a relatively high illumination, and at the same time, the imaging quality of the optical imaging lens in darker environments can be effectively improved, making the optical imaging lens more practical.

[0061] In an exemplary embodiment, the combined focal length f23 of the second lens and the third lens and the total effective focal length f of the optical imaging lens may satisfy: 1.0<f23 / f<1.5. Reasonable control of the relationship between the combined focal length of the second lens and the third lens and the total effective focal length of the optical imaging lens can effectively reduce the aberration of the optical imaging system, reduce the sensitivity of the optical imaging system, avoid excessive concentration of optical power in the optical imaging system, and compress the inclination angle of the incident light on the basis of achieving good convergence of the incident light, so that the light can be transmitted smoothly, which is beneficial to the processing of the optical imaging lens while increasing the field angle of the optical imaging lens.

[0062] In an exemplary embodiment, the axial distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens and the axial distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens can satisfy: -1.9<SAG12 / SAG22<-1.3. By controlling the ratio of the sagittal height of the image side surface of the first lens to that of the second lens within a reasonable numerical range, it is beneficial to improve the spherical aberration of the intermediate field of view and the coma aberration of the edge field of view of the optical imaging lens, so that the optical imaging lens has better aberration correction capability, and at the same time, it is beneficial to improve the effective focal length of the optical imaging lens while maintaining the imaging quality of the optical imaging lens.

[0063] In an exemplary embodiment, the edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens may satisfy: 0.7<ET2 / ET3<1.3. Reasonable control of the relationship between the edge thicknesses of the second lens and the third lens can not only effectively balance the chromatic aberration and distortion of the optical imaging system, but also avoid the situation where the second lens and the third lens are too thin and thus cause processing difficulties.

[0064] In an exemplary embodiment, the optical imaging lens may further include an aperture. The aperture may be disposed at an appropriate position as required. For example, the aperture may be disposed between the first lens and the second lens. Optionally, the optical imaging lens may further include a filter and a protective glass for protecting a photosensitive element located on the imaging surface.

[0065] The present application proposes an optical imaging lens with characteristics such as a wide viewing angle and high image quality. The optical imaging lens according to the above-mentioned embodiment of the present application can use multiple lenses, such as the four lenses described above. By reasonably allocating the focal length, 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, making the optical imaging lens more conducive to production and processing.

[0066] 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 of the first lens to the image side 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 and image side 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 and image side of each lens in the first lens, the second lens, the third lens and the fourth lens are all aspherical mirror surfaces.

[0067] 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.

[0068] 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.

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

[0070] Example 1

[0071] The following reference Figures 1 to 2D An optical imaging lens according to Embodiment 1 of the present application is described. Figure 1 is a schematic diagram showing the structure 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 and an imaging surface S11.

[0073] The first lens E1 has negative power, its object side surface S1 is concave, and the image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is convex, and the image side surface S4 is convex. The third lens E3 has negative power, its object side surface S5 is concave, and the image side surface S6 is concave. The fourth lens E4 has positive 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.

[0074] 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).

[0075]

[0076]

[0077] Table 1

[0078] In this embodiment, the total effective focal length of the optical imaging lens is f=1.35 mm, the distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis is 3.97 mm, and half of the diagonal length of the effective pixel area on the imaging surface S11 is ImgH=1.81 mm.

[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, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0080]

[0081] 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 .

[0082] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 8.1408E-01 -1.7651E+00 3.6372E+00 -6.0347E+00 7.3826E+00 -6.4371E+00 3.7828E+00 -1.3291E+00 2.0764E-01 S2 1.2908E+00 -4.4873E-01 8.0507E+00 -2.1445E+02 1.9852E+03 -9.0876E+03 2.2404E+04 -2.8355E+04 1.4348E+04 S3 -3.3863E-01 -9.5355E-01 -5.3827E+01 2.2196E+03 -4.1048E+04 4.0361E+05 -2.2109E+06 6.3757E+06 -7.5738E+06 S4 -3.1568E+00 7.4255E+01 -8.7096E+02 6.4481E+03 -3.1750E+04 1.0348E+05 -2.1408E+05 2.5425E+05 -1.3185E+05 S5 -5.0221E+00 8.7184E+01 -9.6807E+02 7.1545E+03 -3.6198E+04 1.2310E+05 -2.6855E+05 3.3898E+05 -1.8807E+05 S6 -3.4628E+00 3.0186E+01 -1.9518E+02 8.9057E+02 -2.8016E+03 5.8729E+03 -7.7819E+03 5.8764E+03 -1.9237E+03 S7 -1.6266E+00 5.1639E+00 -1.5507E+01 3.5373E+01 -5.6078E+01 5.8589E+01 -3.8189E+01 1.4019E+01 -2.2069E+00 S8 -6.8229E-01 1.1107E+00 -2.1085E+00 3.1459E+00 -3.2905E+00 2.2331E+00 -9.2570E-01 2.1109E-01 -2.0130E-02

[0083] Table 2

[0084] Figure 2AThe 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 curvature and the sagittal image curvature. Figure 2C The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 2D The magnification 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. FIG. 2A to FIG. 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 An optical imaging lens according to Embodiment 2 of the present application is described. Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 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 and an imaging surface S11.

[0088] The first lens E1 has negative power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is convex, and the image side surface S4 is convex. The third lens E3 has negative power, its object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive 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.

[0089] In this embodiment, the total effective focal length of the optical imaging lens is f=1.26 mm, the distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis is 4.00 mm, and half of the diagonal length of the effective pixel area on the imaging surface S11 is ImgH=1.95 mm.

[0090] 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 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 both aspherical surfaces. Table 4 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 and A 20 .

[0094] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 8.9934E-01 -2.1730E+00 4.6988E+00 -8.3317E+00 1.1309E+01 -1.0935E+01 6.9369E+00 -2.5513E+00 4.0706E-01 S2 1.5842E+00 -6.5974E+00 7.1731E+01 -5.8686E+02 2.9985E+03 -9.2916E+03 1.7004E+04 -1.6728E+04 6.6724E+03 S3 -4.4548E-01 3.1183E+00 -1.9846E+02 4.8112E+03 -6.7493E+04 5.6467E+05 -2.7931E+06 7.5345E+06 -8.5589E+06 S4 -3.3293E+00 7.4764E+01 -8.8220E+02 6.5671E+03 -3.2392E+04 1.0546E+05 -2.1744E+05 2.5665E+05 -1.3185E+05 S5 -5.1617E+00 9.5128E+01 -1.1228E+03 8.6240E+03 -4.4129E+04 1.4802E+05 -3.1091E+05 3.6909E+05 -1.8807E+05 S6 -3.2216E+00 3.1755E+01 -2.3043E+02 1.1575E+03 -3.9379E+03 8.8315E+03 -1.2431E+04 9.9122E+03 -3.4027E+03 S7 -1.5488E+00 5.1857E+00 -1.5887E+01 3.6366E+01 -5.8474E+01 6.2962E+01 -4.2801E+01 1.6470E+01 -2.7164E+00 S8 -7.4403E-01 1.3598E+00 -2.5660E+00 3.5695E+00 -3.4773E+00 2.2641E+00 -9.2570E-01 2.1109E-01 -2.0130E-02

[0095] Table 4

[0096] 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 curvature and the sagittal image curvature. Figure 4C The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4D The magnification 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. FIG. 4A to FIG. 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 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.

[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 and an imaging surface S11.

[0100] The first lens E1 has negative power, its object side surface S1 is concave, and the image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is convex, and the image side surface S4 is convex. The third lens E3 has negative power, its object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive 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.

[0101] In this embodiment, the total effective focal length of the optical imaging lens is f=1.13 mm, the distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis is 4.00 mm, and half of the diagonal length of the effective pixel area on the imaging surface S11 is ImgH=1.95 mm.

[0102] 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 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 both aspherical surfaces. Table 6 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 and A 20 .

[0106] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 8.1592E-01 -1.5833E+00 2.6443E+00 -3.2208E+00 2.5371E+00 -1.1754E+00 2.4948E-01 7.1463E-03 -8.6765E-03 S2 1.7262E+00 -1.7626E+01 2.2479E+02 -1.5717E+03 6.3510E+03 -1.5307E+04 2.1708E+04 -1.6701E+04 5.3658E+03 S3 -4.1993E-01 6.1298E-01 -5.9423E+01 1.3540E+03 -1.9937E+04 1.7989E+05 -9.7218E+05 2.8613E+06 -3.5358E+06 S4 -3.4558E+00 8.2626E+01 -9.6063E+02 6.9214E+03 -3.2716E+04 1.0115E+05 -1.9637E+05 2.1651E+05 -1.0318E+05 S5 -5.1928E+00 8.7395E+01 -9.0633E+02 6.0468E+03 -2.6942E+04 7.8991E+04 -1.4550E+05 1.5159E+05 -6.7493E+04 S6 -3.5034E+00 2.8543E+01 -1.6638E+02 6.7075E+02 -1.8639E+03 3.4784E+03 -4.1387E+03 2.8264E+03 -8.4059E+02 S7 -1.4120E+00 3.9958E+00 -1.0898E+01 2.1935E+01 -3.0979E+01 2.9996E+01 -1.8928E+01 6.9220E+00 -1.0962E+00 S8 -3.1605E-01 -3.6114E-01 1.7206E+00 -3.3970E+00 3.8338E+00 -2.5912E+00 1.0348E+00 -2.2527E-01 2.0593E-02

[0107] Table 6

[0108] 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 curvature and the sagittal image curvature. Figure 6C The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.6D The magnification chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 6A to FIG. 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 Embodiment 4 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown.

[0111] like Figure 7As 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 and an imaging surface S11.

[0112] The first lens E1 has negative power, its object side surface S1 is concave, and the image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is convex, and the image side surface S4 is convex. The third lens E3 has negative power, its object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive 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.

[0113] In this embodiment, the total effective focal length of the optical imaging lens is f=1.07 mm, the distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis is 4.00 mm, and half of the diagonal length of the effective pixel area on the imaging surface S11 is ImgH=1.90 mm.

[0114] Table 7 shows a basic parameter table of the optical imaging lens of Example 4, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0115]

[0116] Table 7

[0117] 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 both aspherical surfaces. Table 8 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 and A 20 .

[0118]

[0119]

[0120] Table 8

[0121] 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 curvature and the sagittal image curvature. Figure 8CThe distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.8D The magnification chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 8A to FIG. 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 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.

[0124] like Fig. 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 and an imaging surface S11.

[0125] The first lens E1 has negative power, its object side surface S1 is concave, and the image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is convex, and the image side surface S4 is convex. The third lens E3 has negative power, its object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive 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.

[0126] In this embodiment, the total effective focal length of the optical imaging lens is f=1.14 mm, the distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S11 on the optical axis is 4.00 mm, and half of the diagonal length of the effective pixel area on the imaging surface S11 is ImgH=1.95 mm.

[0127] Table 9 shows a basic parameter table of the optical imaging lens of Example 5, wherein the units of the radius of curvature, thickness / distance 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 one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 10 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 , A14 , A 16 , A 18 and A 20 .

[0131] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 8.2631E-01 -1.6135E+00 2.7161E+00 -3.3334E+00 2.6460E+00 -1.2381E+00 2.6832E-01 5.5311E-03 -8.9621E-03 S2 1.1751E+00 1.9521E+00 -4.1819E+01 3.0977E+02 -1.3180E+03 3.4323E+03 -5.3789E+03 4.6478E+03 -1.7035E+03 S3 -4.2393E-01 7.4740E-01 -5.9749E+01 1.2758E+03 -1.8020E+04 1.5894E+05 -8.5171E+05 2.5097E+06 -3.1258E+06 S4 -3.5085E+00 8.4812E+01 -9.9877E+02 7.3061E+03 -3.5148E+04 1.1086E+05 -2.1996E+05 2.4824E+05 -1.2118E+05 S5 -5.2294E+00 8.8546E+01 -9.2291E+02 6.1796E+03 -2.7572E+04 8.0677E+04 -1.4755E+05 1.5141E+05 -6.5504E+04 S6 -3.5192E+00 2.8862E+01 -1.6960E+02 6.8937E+02 -1.9298E+03 3.6229E+03 -4.3272E+03 2.9576E+03 -8.7683E+02 S7 -1.4025E+00 3.9193E+00 -1.0733E+01 2.1759E+01 -3.1022E+01 3.0363E+01 -1.9364E+01 7.1516E+00 -1.1429E+00 S8 -3.8169E-01 2.3549E-01 -3.9605E-01 5.0258E-01 -3.2394E-01 7.1745E-02 2.3820E-02 -1.5634E-02 2.3055E-03

[0132] Table 10

[0133] 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. 10B The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 10C The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig. 10D The magnification 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. FIG. 10A to FIG. 10D It can be seen that the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0134] In summary, Examples 1 to 5 respectively satisfy the relationships shown in Table 11.

[0135] Conditional / Example 1 2 3 4 5 FOV(°) 116.1 113.8 139.3 140.6 134.8 f1 / R2 -1.67 -2.02 -1.68 -1.71 -1.68 f2 / (R3+R4) 1.90 2.02 1.68 1.64 1.71 (f3+f4) / f 1.25 1.34 1.32 1.27 1.32 (R8+R7) / (R8-R7) 5.98 6.19 6.16 5.95 6.11 CT2 / (CT3+CT4) 1.17 1.29 1.15 1.14 1.15 T12 / ImgH 0.37 0.44 0.48 0.53 0.49 DT42 / DT22 2.45 2.25 2.53 2.49 2.63 TTL / SL 1.33 1.37 1.46 1.48 1.46 f23 / f 1.12 1.20 1.32 1.40 1.32 SAG12 / SAG22 -1.69 -1.39 -1.60 -1.46 -1.79 ET2 / ET3 1.20 1.05 0.90 0.76 0.99

[0136] Table 11

[0137] 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: Along the optical axis from the object side to the image side, they include: a first lens having negative optical power and a concave image-side surface; a second lens having positive refractive power, its object-side surface being convex and its image-side surface being convex; a third lens element having negative optical power and a concave image-side surface; and The fourth lens has positive optical power, its object side surface is convex and its image side surface is concave. The optical imaging lens has four lenses with optical power. The maximum field of view (FOV) of the optical imaging lens satisfies the following conditions: 113.8°≤FOV≤140.6°; The optical imaging lens further includes an aperture, and a distance SL from the aperture to the imaging plane of the optical imaging lens on the optical axis and a distance TTL from the object-side surface of the first lens to the imaging plane on the optical axis satisfy the following conditions: 1.33≤TTL / SL≤1.48; and A curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens satisfy: 5.95≤(R8+R7) / (R8-R7)≤6.

19.

2. The optical imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -2.02≤f1 / R2≤-1.

67.

3. The optical imaging lens according to claim 1, wherein: The effective focal length f2 of the second lens, the curvature radius R3 of the object-side surface of the second lens, and the curvature radius R4 of the image-side surface of the second lens satisfy: 1.64≤f2 / (R3+R4)≤2.

02.

4. The optical imaging lens according to claim 1, wherein: The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the total effective focal length f of the optical imaging lens satisfy the following requirements: 1.25≤(f3+f4) / f≤1.

34.

5. The optical imaging lens according to claim 1, wherein: The center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, and the center thickness CT4 of the fourth lens on the optical axis satisfy: 1.14≤CT2 / (CT3+CT4)≤1.

29.

6. The optical imaging lens according to any one of claims 1 to 5, wherein: The air gap T12 between the first lens and the second lens on the optical axis and half the diagonal length ImgH of the effective pixel area on the imaging plane satisfy: 0.37≤T12 / ImgH≤0.

53.

7. The optical imaging lens according to any one of claims 1 to 5, wherein: The maximum effective radius DT22 of the image side surface of the second lens and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 2.2<DT42 / DT22≤2.

63.

8. The optical imaging lens according to any one of claims 1 to 5, wherein: The combined focal length f23 of the second lens and the third lens and the total effective focal length f of the optical imaging lens satisfy: 1.12≤f23 / f≤1.

40.

9. The optical imaging lens according to any one of claims 1 to 5, wherein: The on-axis distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens and the on-axis distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens satisfy: -1.79≤SAG12 / SAG22≤-1.

39.

10. The optical imaging lens according to any one of claims 1 to 5, wherein: The edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens satisfy: 0.76≤ET2 / ET3≤1.20.

Images