Optical imaging lens

Abstract

The present application discloses an optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens having optical powers. The first lens has a negative optical power, and its object side surface is concave. The object side surface of the second lens is convex, and the image side surface is concave. The third lens has a positive optical power, its object side surface is convex, and the image side surface is convex. The fourth lens has a negative optical power. The fifth lens has a positive optical power, its object side surface is concave, and the image side surface is convex. The sixth lens has a negative optical power. Among them, the optical imaging lens satisfies: 120° < FOV < 130°; and 0.5 < f3 / (R5 + R6) < 5.5, where FOV is the maximum field of view angle of the optical imaging lens, f3 is the effective focal length of the third lens, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens.

Description

Technical Field

[0001] This application relates to the field of optical elements, and specifically, to an optical imaging lens. Background Art

[0002] In recent years, with the rapid development of technology, image sensor technologies such as CCD and CMOS have also been continuously evolving, resulting in a trend of gradually increasing the number of pixels per chip and gradually decreasing the size of a single pixel. However, while the image sensing technology is developing, the requirements for the imaging performance of optical systems have become increasingly high. It is not only required that the system can clearly image the scene, but also required to have performance such as ultra-wide angle and thin and light. In addition, the balance of system optical aberrations is also one of the performance improvements that people continuously pursue. Therefore, how to obtain an imaging lens that meets user requirements has become an urgent problem to be solved. Summary of the Invention

[0003] On the one hand, this application provides an optical imaging lens. The optical imaging lens sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens having optical power along the optical axis from the object side to the image side. The first lens has a negative optical power, and its object side surface is concave; the object side surface of the second lens is convex, and the image side surface is concave; the third lens has a positive optical power, its object side surface is convex, and the image side surface is convex; the fourth lens has a negative optical power; the fifth lens has a positive optical power, its object side surface is concave, and the image side surface is convex; the sixth lens has a negative optical power. Among them, the optical imaging lens satisfies: 120° < FOV < 130°; and 0.5 < f3 / (R5 + R6) < 5.5, where FOV is the maximum field of view angle of the optical imaging lens, f3 is the effective focal length of the third lens, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens.

[0004] In one embodiment, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror surface.

[0005] In one embodiment, the optical imaging lens satisfies: 1.4 < f1 / R1 < 2.6, where f1 is the effective focal length of the first lens, and R1 is the curvature radius of the object side surface of the first lens.

[0006] In one embodiment, the optical imaging lens satisfies: 1.8 < (f5 - f4) / (R8 + R10) < 4.4, where f5 is the effective focal length of the fifth lens, f4 is the effective focal length of the fourth lens, R8 is the curvature radius of the image side surface of the fourth lens, and R10 is the curvature radius of the image side surface of the fifth lens.

[0007] In one embodiment, the optical imaging lens satisfies: 1.7 < f6 / (R12 - R11) < 3.7, where f6 is the effective focal length of the sixth lens, R11 is the curvature radius of the object side surface of the sixth lens, and R12 is the curvature radius of the image side surface of the sixth lens.

[0008] In one embodiment, the optical imaging lens satisfies: 3.2 < (DT12 + DT32) / (DT12 - DT32) < 3.9, where DT12 is the effective semi-aperture of the image side surface of the first lens, and DT32 is the effective semi-aperture of the image side surface of the third lens.

[0009] In one embodiment, the optical imaging lens satisfies: 2.9 < DT61 / DT31 < 3.4, where DT61 is the effective semi-aperture of the object side surface of the sixth lens, and DT31 is the effective semi-aperture of the object side surface of the third lens.

[0010] In one embodiment, the optical imaging lens satisfies: 1.8 < f23 / (CT2 + T23 + CT3) < 2.9, where f23 is the combined focal length of the second lens and the third lens, CT2 is the central thickness of the second lens on the optical axis, T23 is the distance between the second lens and the third lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis.

[0011] In one embodiment, the optical imaging lens satisfies: 1.6 < f45 / CT5 < 2.3, where f45 is the combined focal length of the fourth lens and the fifth lens, and CT5 is the central thickness of the fifth lens on the optical axis.

[0012] In one embodiment, the optical imaging lens satisfies: 1 < T12 / SAG12 < 1.5, where T12 is the distance between the first lens and the second lens on the optical axis, and SAG12 is the axial distance between the intersection of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens.

[0013] In one embodiment, the optical imaging lens satisfies: 1.6 < SAG52 / (SAG41 + SAG61) < 2.6, where SAG41 is the axial distance between the intersection of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens, SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens, and SAG52 is the axial distance between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens.

[0014] In one embodiment, the optical imaging lens satisfies: 0.8 < (ET3 + ET4) / ET6 < 1.4, where ET3 is the edge thickness of the third lens, ET4 is the edge thickness of the fourth lens, and ET6 is the edge thickness of the sixth lens.

[0015] This application adopts a six-lens structure, which can achieve at least one of the following beneficial effects. By reasonably distributing the optical power, surface shape, etc. of each lens, the optical imaging lens can effectively balance the low-order aberrations of the imaging lens while meeting the imaging requirements, and reduce the tolerance sensitivity; by controlling the field of view angle of the imaging lens within a certain range, the characteristic of ultra-wide angle can be achieved; by restricting the effective focal length of the third lens and the curvature radius of the object and image sides within a certain range, the optical aberrations can be balanced, thereby improving the imaging effect of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects, and advantages of this application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0017] Figure 1 FIG. 1 shows a schematic structural diagram of an optical imaging lens according to Embodiment 1 of this application;

[0018] Figures 2A to 2D FIGS. 2-5 respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 1;

[0019] Figure 3 FIG. 6 shows a schematic structural diagram of an optical imaging lens according to Embodiment 2 of this application;

[0020] Figures 4A to 4D FIGS. 7-10 respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 2;

[0021] Figure 5 FIG. 11 shows a schematic structural diagram of an optical imaging lens according to Embodiment 3 of this application;

[0022] Figures 6A to 6D FIGS. 12-15 respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 3;

[0023] Figure 7 FIG. 16 shows a schematic structural diagram of an optical imaging lens according to Embodiment 4 of this application;

[0024] Figures 8A to 8D FIGS. 17-20 respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 4;

[0025] Figure 9Shows a schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application;

[0026] Figures 10A to 10D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 5;

[0027] Figure 11 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application; and

[0028] Figures 12A to 12D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 6. Detailed implementation manners

[0029] To better understand the present application, more detailed descriptions of various aspects of the present application will be made 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 do not 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.

[0030] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0031] In the drawings, for the sake of clarity, the thickness, size, and shape of the lenses have been slightly exaggerated. 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 spherical or aspherical surfaces shown in the drawings. The drawings are only for illustration and are not drawn to an exact scale.

[0032] In this document, 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 being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0033] It should also be understood that the terms "comprising", "comprises", "having", "includes" and / or "including", when used in this specification, denote the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. Further, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than an individual element in the list. Further, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0034] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0035] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0036] The features, principles and other aspects of the present application will be described in detail below.

[0037] The optical imaging lens according to an exemplary embodiment of the present application may include six lenses having optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. These six lenses are arranged in sequence along the optical axis from the object side to the image side. There may be a spacing distance between any two adjacent lenses among the first lens to the sixth lens.

[0038] In an exemplary embodiment, the first lens may have a negative optical power, and its object side surface is concave; the object side surface of the second lens is convex and the image side surface is concave; the third lens has a positive optical power, its object side surface is convex and the image side surface is convex; the fourth lens has a negative optical power; the fifth lens has a positive optical power, its object side surface is concave and the image side surface is convex; the sixth lens has a negative optical power. By reasonably controlling the optical power and surface shape of each component of the system, the low-order aberrations of the system can be effectively balanced and the tolerance sensitivity can be reduced.

[0039] FOV is the maximum field of view angle of the optical imaging lens. By controlling the maximum field of view angle FOV of the lens within a certain range, the characteristics of an ultra-wide angle can be achieved. Specifically, FOV may satisfy: 120° < FOV < 130°.

[0040] f3 is the effective focal length of the third lens, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens. By restricting the sum R5 + R6 of the effective focal length f3 of the third lens and the curvature radii of the object side surface and the image side surface within a certain range, optical aberrations can be balanced to ensure better imaging quality. Specifically, the ratio of the effective focal length f3 of the third lens to the sum of the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface can satisfy: 0.5 < f3 / (R5 + R6) < 5.5. Further, it can satisfy 0.5 < f3 / (R5 + R6) < 3.0.

[0041] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.4 < f1 / R1 < 2.6, where f1 is the effective focal length of the first lens and R1 is the curvature radius of the object side surface of the first lens. By setting the ratio of the effective focal length f1 of the first lens to the curvature radius R1 of the object side surface of the first lens within a reasonable range, optical aberrations can be balanced to ensure better imaging quality. More specifically, the ratio of f1 to R1 can further satisfy: 1.5 < f1 / R1 < 2.5.

[0042] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 1.8 < (f5 - f4) / (R8 + R10) < 4.4, where f5 is the effective focal length of the fifth lens, f4 is the effective focal length of the fourth lens, R8 is the curvature radius of the image side surface of the fourth lens, and R10 is the curvature radius of the image side surface of the fifth lens. By reasonably controlling the ratio of the effective focal length difference between the fifth lens and the fourth lens to the sum of the curvature radii of the image side surfaces of the fourth lens and the fifth lens within a certain range, the optical path deflection of the system can be better realized, and the high-order spherical aberration generated by the imaging system can be balanced. More specifically, the difference between f5 and f4 and the sum of R8 and R10 can further satisfy: 1.9 < (f5 - f4) / (R8 + R10) < 4.3.

[0043] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 1.7 < f6 / (R12 - R11) < 3.7, where f6 is the effective focal length of the sixth lens, R11 is the curvature radius of the object side surface of the sixth lens, and R12 is the curvature radius of the image side surface of the sixth lens. By controlling the ratio of the effective focal length f6 of the sixth lens to the difference between the curvature radii of its object and image side surfaces, the deflection angle of the marginal rays of the system can be reasonably controlled, ensuring that the optical lens has good processability and reducing the system sensitivity. More specifically, the ratio of f6 to the difference between R12 and R11 can further satisfy: 1.8 ≤ f6 / (R12 - R11) < 3.6.

[0044] In an exemplary embodiment, the optical imaging lens according to the present application satisfies 3.2 < (DT12 + DT32) / (DT12 - DT32) < 3.9, where DT12 is the effective semi-aperture of the image side of the first lens, and DT32 is the effective semi-aperture of the image side of the third lens. By controlling the ratio of the effective semi-apertures of the image sides of the first lens and the third lens within a certain range, the step difference of the lens structure can be reduced, the processability can be improved, and the sensitivity can be reduced. More specifically, the ratio of the sum of DT12 and DT32 to the difference between DT12 and DT32 can further satisfy: 3.4 < (DT12 + DT32) / (DT12 - DT32) < 3.8.

[0045] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 2.9 < DT61 / DT31 < 3.4, where DT61 is the effective semi-aperture of the object side of the sixth lens, and DT31 is the effective semi-aperture of the object side of the third lens. By limiting the effective semi-apertures of the object sides of the sixth lens and the third lens within a reasonable range, the size of the lens can be reduced, the miniaturization of the lens can be achieved, and the resolution can be improved. More specifically, DT61 and DT31 can further satisfy: 3.0 < DT61 / DT31 < 3.3.

[0046] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 1.8 < f23 / (CT2 + T23 + CT3) < 2.9, where f23 is the combined focal length of the second lens and the third lens, CT2 is the central thickness of the second lens on the optical axis, T23 is the air gap between the second lens and the third lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. By controlling the ratio of the combined focal length of the second and third lenses to the sum of their central thicknesses and air gaps on the optical axis, the optical powers of the second and third lenses can be reasonably distributed, the off-axis aberration of the system can be balanced, and the aberration correction ability can be improved. More specifically, the ratio of f23 to the sum of CT2, T23, and CT3 can further satisfy: 1.9 < f23 / (CT2 + T23 + CT3) < 2.8.

[0047] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 1.6 < f45 / CT5 < 2.3, where f45 is the combined focal length of the fourth lens and the fifth lens, and CT5 is the central thickness of the fifth lens on the optical axis. By controlling the ratio of the combined focal length of the fourth and fifth lenses to the central thickness of the fifth lens on the optical axis, the coma of the optical system can be reasonably controlled, so that the optical system has good optical performance. Further, the ratio of f45 to CT5 can satisfy: 1.7 < f45 / CT5 < 2.2.

[0048] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 1.1 < T12 / SAG12 < 1.5, where T12 is the distance between the first lens and the second lens on the optical axis, and SAG12 is the axial distance between the intersection of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens. By constraining the distance T12 between the first lens and the second lens on the optical axis and the sagitta SAG12 of the image side surface of the first lens within a reasonable range, it is beneficial to ensure the processing and shaping of the lens, reduce sensitivity, and thus improve the imaging effect of the system. More specifically, the distance T12 between the first lens and the second lens on the optical axis and the sagitta SAG12 of the image side surface of the first lens may satisfy 1.15 < T12 / SAG12 < 1.45.

[0049] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 1.6 < SAG52 / (SAG41 + SAG61) < 2.6, where SAG41 is the axial distance between the intersection of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens, SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens, and SAG52 is the axial distance between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens. By reasonably controlling the sagitta SAG52 of the image side surface of the fifth lens and the sagittas SAG41 and SAG61 of the object side surfaces of the fourth and sixth lenses within a certain range, the principal ray angle of the optical imaging lens can be adjusted, effectively improving the relative luminance of the optical imaging lens group and enhancing the image plane clarity. More specifically, SAG52, SAG41, and SAG61 may satisfy: 1.7 < SAG52 / (SAG41 + SAG61) < 2.6.

[0050] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 0.8 < (ET3 + ET4) / ET6 < 1.4, where ET3 is the edge thickness of the third lens, ET4 is the edge thickness of the fourth lens, and ET6 is the edge thickness of the sixth lens. By controlling the edge thicknesses ET3, ET4, and ET6 of the third lens, the fourth lens, and the sixth lens within a certain range, it is beneficial to the manufacturing and shaping of each lens, and thus beneficial to assembling an optical imaging lens with better quality. More specifically, ET3, ET4, and ET6 may satisfy: 1.0 < (ET3 + ET4) / ET6 < 1.3.

[0051] In an exemplary embodiment, the effective focal length f1 of the first lens may be, for example, in the range of -6 mm to -3 mm, the effective focal length f2 of the second lens may be, for example, in the range of -91 mm to 8 mm, the effective focal length f3 of the third lens may be, for example, in the range of 2 mm to 3 mm, the effective focal length f4 of the fourth lens may be, for example, in the range of -8 mm to -4 mm, the effective focal length f5 of the fifth lens may be, for example, in the range of 1 mm to 2 mm, and the effective focal length f6 of the sixth lens may be, for example, in the range of -2 mm to -3 mm.

[0052] In an exemplary embodiment, the total effective focal length f of the optical imaging lens may be, for example, in the range of 1.5 mm to 2 mm, the total length TTL of the optical imaging lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 of the optical imaging lens) may be, for example, in the range of 5 mm to 5.5 mm, and half of the diagonal length of the effective pixel region on the imaging surface S15 of the optical imaging lens, ImgH, may be, for example, in the range of 3.0 mm to 3.2 mm.

[0053] In an exemplary embodiment, the optical imaging lens according to the present application further includes a diaphragm disposed between the object side and the first lens. Optionally, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The present application proposes an optical imaging lens having characteristics such as miniaturization, high imaging quality, and ultra-wide angle. The optical imaging lens according to the above embodiment of the present application may employ multiple lenses, such as the six lenses described above. By reasonably distributing the optical power, surface shape, field of view angle of the imaging lens, and the axial spacing between the lenses, etc., the low-order aberrations of the imaging lens can be effectively balanced, the tolerance sensitivity can be reduced, which is beneficial to ensuring the processing and shaping of the lenses, reducing the sensitivity, and thus improving the imaging effect of the system.

[0054] In an 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 sixth lens is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberrations that occur during imaging 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 of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspherical mirror surface. Optionally, both the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are aspherical mirror surfaces.

[0055] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this 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 six lenses are described as an example in the embodiments, the optical imaging lens is not limited to including six lenses. If necessary, the optical imaging lens may further include other numbers of lenses.

[0056] The specific embodiments of the optical imaging lens applicable to the above embodiments will be further described below with reference to the accompanying drawings.

[0057] Example 1

[0058] The following refers to Figures 1 to 2D Describe the optical imaging lens according to Embodiment 1 of this application. Figure 1 The schematic structural diagram of the optical imaging lens according to Embodiment 1 of this application is shown.

[0059] As Figure 1 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0060] The first lens E1 has a negative focal power, its object surface S1 is concave, and its image surface S2 is concave. The second lens E2 has a positive focal power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive focal power, its object surface S5 is convex, and its image surface S6 is convex. The fourth lens E4 has a negative focal power, its object surface S7 is concave, and its image surface S8 is concave. The fifth lens E5 has a positive focal power, its object surface S9 is concave, and its image surface S10 is convex. The sixth lens E6 has a negative focal power, its object surface S11 is convex, and its image surface S12 is concave. The filter E10 has an object surface S13 and an image surface S14. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0061] Table 1 shows the basic parameter table of the optical imaging lens of Embodiment 1, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0062]

[0063] Table 1

[0064] In this example, the total effective focal length f of the optical imaging lens is 1.83 mm, the maximum field of view FOV of the optical imaging lens is 125.7°, the total length TTL of the optical imaging lens is 5.29 mm, and half of the diagonal length of the effective pixel region on the imaging surface S15 of the optical imaging lens is ImgH = 3.19 mm.

[0065] In Embodiment 1, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface profiles of the respective aspherical lenses can be defined by, but not limited to, the following aspherical formula:

[0066] (1)

[0067] where is the sagitta, the distance from the vertex of the aspherical surface to the aspherical surface along the optical axis at a position with a height of h ; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i -th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order term coefficients that can be used for the respective aspherical mirror surfaces S1 - S12 in Embodiment 1 A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0068]

[0069] Table 2

[0070] Figure 2AShows the axial chromatic aberration curve of the optical imaging lens of Embodiment 1, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 2B Shows the astigmatism curve of the optical imaging lens of Embodiment 1, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2C Shows the distortion curve of the optical imaging lens of Embodiment 1, which represents the distortion magnitude values corresponding to different image heights. Figure 2D Shows the lateral chromatic aberration curve of the optical imaging lens of Embodiment 1, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 2A to 2D it can be seen that the optical imaging lens given in Embodiment 1 can achieve good imaging quality.

[0071] Example 2

[0072] The following refers to Figures 3 to 4D Describe the optical imaging lens according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 3 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 2 of the present application.

[0073] As Figure 3 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0074] The first lens E1 has a negative optical power, its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has a positive optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a negative optical power, its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has a negative optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The filter E10 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0075] In this example, the total effective focal length f of the optical imaging lens is 1.83 mm, the maximum field of view FOV of the optical imaging lens is 125.2°, the total length TTL of the optical imaging lens is 5.28 mm, and half of the diagonal length of the effective pixel region on the imaging surface S15 of the optical imaging lens is ImgH = 3.19 mm.

[0076] Table 3 shows the basic parameter table of the optical imaging lens of Embodiment 2, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 4 shows the high-order term coefficients of each aspherical mirror surface that can be used in Embodiment 2, where each aspherical surface type can be defined by Formula (1) given in Embodiment 1 above.

[0077]

[0078] Table 3

[0079]

[0080] Table 4

[0081] Figure 4A shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 2, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 4B shows the astigmatism curve of the optical imaging lens of Embodiment 2, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4C shows the distortion curve of the optical imaging lens of Embodiment 2, which represents the distortion magnitude values corresponding to different image heights. Figure 4D shows the longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 2, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 4A to 4D it can be known that the optical imaging lens given in Embodiment 2 can achieve good imaging quality.

[0082] Example 3

[0083] The following refers to Figures 5 to 6D to describe the optical imaging lens according to Embodiment 3 of the present application. Figure 5 shows a schematic structural diagram of the optical imaging lens according to Embodiment 3 of the present application.

[0084] As Figure 5 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0085] The first lens E1 has a negative optical power, its object side S1 is concave, and its image side S2 is concave. The second lens E2 has a positive optical power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a positive optical power, its object side S5 is convex, and its image side S6 is convex. The fourth lens E4 has a negative optical power, its object side S7 is convex, and its image side S8 is concave. The fifth lens E5 has a positive optical power, its object side S9 is concave, and its image side S10 is convex. The sixth lens E6 has a negative optical power, its object side S11 is convex, and its image side S12 is concave. The filter E10 has an object side S13 and an image side S14. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0086] In this example, the total effective focal length f of the optical imaging lens is 1.83 mm, the maximum field of view angle FOV of the optical imaging lens is 125.5°, the total length TTL of the optical imaging lens is 5.28 mm, and half of the diagonal length of the effective pixel region on the imaging surface S15 of the optical imaging lens, ImgH, is 3.19 mm.

[0087] Table 5 shows the basic parameter table of the optical imaging lens of Example 3, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 6 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Example 3, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0088]

[0089] Table 5

[0090]

[0091] Table 6

[0092] Figure 6A Shows the axial chromatic aberration curve of the optical imaging lens of Example 3, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 6B Shows the astigmatism curve of the optical imaging lens of Example 3, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 6C Shows the distortion curve of the optical imaging lens of Example 3, which represents the distortion magnitude values corresponding to different image heights. Figure 6D Shows the lateral chromatic aberration curve of the optical imaging lens of Example 3, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 6A to 6D It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0093] Example 4

[0094] The following is a reference to 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 the optical imaging lens according to Embodiment 4 of the present application is shown.

[0095] As Figure 7 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0096] The first lens E1 has a negative optical power, its object surface S1 is concave, and its image surface S2 is convex. The second lens E2 has a positive optical power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive optical power, its object surface S5 is convex, and its image surface S6 is convex. The fourth lens E4 has a negative optical power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a positive optical power, its object surface S9 is concave, and its image surface S10 is convex. The sixth lens E6 has a negative optical power, its object surface S11 is convex, and its image surface S12 is concave. The filter E10 has an object surface S13 and an image surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0097] In this example, the total effective focal length f of the optical imaging lens is 1.83 mm, the maximum field of view FOV of the optical imaging lens is 125.8°, the total length TTL of the optical imaging lens is 5.24 mm, and half of the diagonal length of the effective pixel region on the imaging surface S15 of the optical imaging lens, ImgH, is 3.20 mm.

[0098] Table 7 shows the basic parameter table of the optical imaging lens of Embodiment 4, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 8 shows the high-order term coefficients of the aspherical mirrors that can be used in Embodiment 4, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0099]

[0100] Table 7

[0101]

[0102] Table 8

[0103] Figure 8A shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 4, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 8BThe astigmatism curve of the optical imaging lens of Embodiment 4 is shown, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 8C The distortion curve of the optical imaging lens of Embodiment 4 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 8D The longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 8A to 8D it can be seen that the optical imaging lens given in Embodiment 4 can achieve good imaging quality.

[0104] Example 5

[0105] The following refers to Figures 9 to 10D to describe the optical imaging lens according to Embodiment 5 of the present application. Figure 9 The structural schematic diagram of the optical imaging lens according to Embodiment 5 of the present application is shown.

[0106] As Figure 9 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0107] The first lens E1 has a negative optical power, its object side surface S1 is concave, and its image side surface S2 is convex. The second lens E2 has a positive optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a negative optical power, its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has a negative optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The filter E10 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0108] In this example, the total effective focal length f of the optical imaging lens is 1.83 mm, the maximum field of view FOV of the optical imaging lens is 125.8°, the total length TTL of the optical imaging lens is 5.24 mm, and half of the diagonal length of the effective pixel region on the imaging surface S15 of the optical imaging lens, ImgH, is 3.20 mm.

[0109] Table 9 shows the basic parameter table of the optical imaging lens of Embodiment 5, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in Embodiment 5, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0110]

[0111] Table 9

[0112]

[0113] Table 10

[0114] Figure 10A The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 10B The 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. Figure 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. Figure 10D The lateral chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 10A to 10D it can be seen that the optical imaging lens given in Example 5 can achieve good imaging quality.

[0115] Example 6

[0116] The following is a reference to Figures 11 to 12D which describes the optical imaging lens according to Embodiment 6 of the present application. Figure 11 The structural schematic diagram of the optical imaging lens according to Embodiment 6 of the present application is shown.

[0117] As Figure 11 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0118] The first lens E1 has a negative optical power, its object side surface S1 is concave, and its image side surface S2 is convex. The second lens E2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has a negative optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The filter E10 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through each surface S1 to S14 and finally forms an image on the imaging surface S15.

[0119] In this example, the total effective focal length f of the optical imaging lens is 1.83 mm, the maximum field of view angle FOV of the optical imaging lens is 124.7°, the total length TTL of the optical imaging lens is 5.28 mm, half of the diagonal length ImgH of the effective pixel region on the imaging surface S15 of the optical imaging lens is 3.20 mm, and the effective focal length f1 of the first lens is -5.56 mm.

[0120] Table 11 shows the basic parameter table of the optical imaging lens of Embodiment 6. Among them, the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 12 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 6. Among them, each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0121]

[0122] Table 11

[0123]

[0124] Table 12

[0125] Figure 12A shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 6, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 12B shows the astigmatism curve of the optical imaging lens of Embodiment 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12C shows the distortion curve of the optical imaging lens of Embodiment 6, which represents the distortion magnitude values corresponding to different image heights. Figure 12D shows the lateral chromatic aberration curve of the optical imaging lens of Embodiment 6, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 12A to 12D it can be seen that the optical imaging lens given in Embodiment 6 can achieve good imaging quality.

[0126] In summary, Embodiments 1 to 6 respectively satisfy the relationships shown in Table 13.

[0127]

[0128] Table 13

[0129] This application also provides an imaging device, and its electronic photosensitive element can be a charge-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 on a mobile electronic device such as a mobile phone. This imaging device is equipped with the optical imaging lens described above.

[0130] The above description is only a preferred embodiment of the present application and an explanation of the technical principles applied. 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 the 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, a technical solution formed by mutually replacing the above features with technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. An optical imaging lens, characterized in that, It sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens having optical power from the object side to the image side along the optical axis. The first lens has a negative optical power, and its object side is concave. The object side of the second lens is convex, and the image side is concave. The third lens has a positive optical power, its object side is convex, and the image side is convex. The fourth lens has a negative optical power, and its image side is concave. The fifth lens has a positive optical power, its object side is concave, and the image side is convex. The sixth lens has a negative optical power, its object side is convex, and the image side is concave. Among them, the number of lenses with optical power in the optical imaging lens is six. The optical imaging lens satisfies: 120° < FOV ≤ 125.8°; 1.47 ≤ f3 / (R5 + R6) < 5.5; and 3.14 ≤ f6 / (R12 - R11) ≤ 3.54, where FOV is the maximum field of view angle of the optical imaging lens, f3 is the effective focal length of the third lens, R5 is the curvature radius of the object side of the third lens, R6 is the curvature radius of the image side of the third lens, f6 is the effective focal length of the sixth lens, R11 is the curvature radius of the object side of the sixth lens, and R12 is the curvature radius of the image side of the sixth lens.

2. The optical imaging lens according to claim 1, wherein The optical imaging lens satisfies: 1.58 ≤ f1 / R1 < 2.5, where f1 is the effective focal length of the first lens, and R1 is the curvature radius of the object side of the first lens.

3. The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies: 2.29 ≤ (f5 - f4) / (R8 + R10) ≤ 4.25, where f5 is the effective focal length of the fifth lens, f4 is the effective focal length of the fourth lens, R8 is the curvature radius of the image side of the fourth lens, and R10 is the curvature radius of the image side of the fifth lens.

4. The optical imaging lens according to claim 1, wherein The optical imaging lens satisfies: 3.45 ≤ (DT12 + DT32) / (DT12 - DT32) ≤ 3.72, where DT12 is the effective semi-aperture of the image side of the first lens, and DT32 is the effective semi-aperture of the image side of the third lens.

5. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 3.12 ≤ DT61 / DT31 < 3.3, where DT61 is the effective semi-aperture of the object side of the sixth lens, and DT31 is the effective semi-aperture of the object side of the third lens.

6. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 2.02 ≤ f23 / (CT2 + T23 + CT3) ≤ 2.75, where f23 is the combined focal length of the second lens and the third lens, CT2 is the central thickness of the second lens on the optical axis, T23 is the distance between the second lens and the third lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis.

7. The optical imaging lens according to claim 3, wherein The optical imaging lens satisfies: 1.90 ≤ f45 / CT5 ≤ 2.10, where f45 is the combined focal length of the fourth lens and the fifth lens, and CT5 is the central thickness of the fifth lens on the optical axis.

8. The optical imaging lens according to claim 1, wherein The optical imaging lens satisfies: 1.15 < T12 / SAG12 < 1.45, Wherein, T12 is the spacing distance between the first lens and the second lens on the optical axis, and SAG12 is the axial distance between the intersection point of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens.

9. The optical imaging lens according to any one of claims 1-8, characterized in that, The optical imaging lens satisfies: 1.7 < SAG52 / (SAG41 + SAG61) ≤ 2.55, Wherein, SAG41 is the axial distance between the intersection point of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens, SAG61 is the axial distance between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens, and SAG52 is the axial distance between the intersection point of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens.

10. The optical imaging lens according to any one of claims 1-8, characterized in that, The optical imaging lens satisfies: 1.07 ≤ (ET3 + ET4) / ET6 ≤ 1.23, Wherein, ET3 is the edge thickness of the third lens, ET4 is the edge thickness of the fourth lens, and ET6 is the edge thickness of the sixth lens.

Images