An optical imaging lens

Abstract

The present invention 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 optical power; a second lens with negative optical power, whose object side surface is convex; an aperture; a third lens with optical power; a fourth lens with optical power; a fifth lens with positive optical power; and a sixth lens with optical power; wherein the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 1.0<R3 / R4<3.5. By reasonably controlling the positive and negative distribution of the optical power of each component of the system, the low-order aberrations of the control system can be effectively balanced, and controlling the ratio of the radius of curvature of the second lens can reduce the sensitivity of the tolerance and maintain the miniaturization of the system. By reasonably controlling the ratio, the inclination angle of the image side surface of the third lens and the image side surface of the second lens can be effectively controlled, reducing the risk of ghost images between the third lens and the second lens.

Description

Technical Field

[0001] The present invention belongs to the field of optical imaging, and in particular relates to an optical imaging lens comprising six lenses. Background Art

[0002] With the popularity of portable electronic products such as mobile phones and tablet computers, people have put forward higher requirements for the diversity of electronic product functions. At the same time, with the development of science and technology, camera technology has become more and more mature, and higher requirements have been put forward for imaging quality. Therefore, the present invention proposes a camera lens set based on the infrared band, which has small distortion and can achieve good imaging effect on the basis of ensuring the miniaturization and ultra-thin characteristics of the lens. Summary of the invention

[0003] The present invention aims to provide an optical imaging lens composed of six lenses, which has small distortion and can achieve good imaging effect while ensuring the miniaturization and ultra-thinness of the lens.

[0004] The present invention proposes an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with optical power; a second lens with negative optical power, whose object side surface is convex; an aperture; a third lens with optical power; a fourth lens with optical power; a fifth lens with positive optical power; and a sixth lens with optical power; wherein a curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: 1.0<R3 / R4<3.5.

[0005] According to one embodiment of the present application, the on-axis distance SAG31 between the intersection of the objective side surface of the third lens and the optical axis to the effective radius vertex of the objective side surface of the third lens and the on-axis distance SAG21 between the intersection of the objective side surface of the second lens and the optical axis to the effective radius vertex of the objective side surface of the second lens satisfy: 2.4<SAG31 / SAG21<6.8.

[0006] According to one embodiment of the present application, the maximum field of view FOV of the imaging lens satisfies: FOV>90°.

[0007] According to one embodiment of the present application, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD<2.5.

[0008] According to one embodiment of the present application, the on-axis distance TTL from the object side of the first lens to the imaging plane and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following: TTL / ImgH<1.6.

[0009] According to one embodiment of the present application, the on-axis distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the effective radius vertex of the object side surface of the fifth lens and the on-axis distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens satisfy: 1.5<SAG62 / SAG51<2.5.

[0010] According to one embodiment of the present application, an edge thickness ET1 of the first lens and a center thickness CT1 of the first lens on the optical axis satisfy: 1.5<CT1 / ET1<2.0.

[0011] According to one embodiment of the present application, the combined focal length f123 of the first lens, the second lens and the third lens and the effective focal length f of the optical imaging lens satisfy: 1.5<f123 / f<3.0.

[0012] According to one embodiment of the present application, half of the diagonal length of the effective pixel area on the imaging plane ImgH and the axial distance TD from the object side of the first lens to the image side of the last lens satisfy: 0.5<ImgH / TD<1.5.

[0013] According to one embodiment of the present application, an air interval T45 between the fourth lens and the fifth lens on the optical axis and an air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 3.7<T56 / T45<8.4.

[0014] According to one embodiment of the present application, the distance SD from the aperture to the image side surface of the last lens and the sum ∑AT of the air intervals on the optical axis between any two adjacent lenses with optical focal length from the first lens to the lens closest to the imaging surface satisfy: 2.0<SD / ∑AT<3.1.

[0015] According to one embodiment of the present application, the absolute value of optical distortion |OPD| satisfies: |OPD|<1.5%.

[0016] The present invention also provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with optical focal power; a second lens with negative optical focal power, whose object side surface is convex; an aperture; a third lens with optical focal power; a fourth lens with optical focal power; a fifth lens with positive optical focal power; and a sixth lens with optical focal power; wherein an axial distance SAG31 between the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens and an axial distance SAG21 between the intersection of the object side surface of the second lens and the optical axis to the vertex of the effective radius of the object side surface of the second lens satisfy the following conditions: 2.4<SAG31 / SAG21<6.8.

[0017] According to one embodiment of the present application, a curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: 1.0<R3 / R4<3.5.

[0018] According to one embodiment of the present application, the maximum field of view FOV of the imaging lens satisfies: FOV>90°.

[0019] According to one embodiment of the present application, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD<2.5.

[0020] According to one embodiment of the present application, the on-axis distance TTL from the object side of the first lens to the imaging plane and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following: TTL / ImgH<1.6.

[0021] According to one embodiment of the present application, the on-axis distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the effective radius vertex of the object side surface of the fifth lens and the on-axis distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens satisfy: 1.5<SAG62 / SAG51<2.5.

[0022] According to one embodiment of the present application, an edge thickness ET1 of the first lens and a center thickness CT1 of the first lens on the optical axis satisfy: 1.5<CT1 / ET1<2.0.

[0023] According to one embodiment of the present application, the combined focal length f123 of the first lens, the second lens and the third lens and the effective focal length f of the optical imaging lens satisfy: 1.5<f123 / f<3.0.

[0024] According to one embodiment of the present application, half of the diagonal length of the effective pixel area on the imaging plane ImgH and the axial distance TD from the object side of the first lens to the image side of the last lens satisfy: 0.5<ImgH / TD<1.5.

[0025] According to one embodiment of the present application, an air interval T45 between the fourth lens and the fifth lens on the optical axis and an air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 3.7<T56 / T45<8.4.

[0026] According to one embodiment of the present application, the distance SD from the aperture to the image side surface of the last lens and the sum ∑AT of the air intervals on the optical axis between any two adjacent lenses with optical focal length from the first lens to the lens closest to the imaging surface satisfy: 2.0<SD / ∑AT<3.1.

[0027] According to one embodiment of the present application, the absolute value of optical distortion |OPD| satisfies: |OPD|<1.5%.

[0028] Beneficial effects of the present invention:

[0029] The optical imaging lens provided by the present invention includes multiple lenses, such as the first lens to the sixth lens. By reasonably controlling the positive and negative distribution of the focal power of each component of the system, the low-order aberrations of the control system can be effectively balanced, and controlling the curvature radius ratio of the second lens can reduce the sensitivity of the tolerance and maintain the miniaturization of the system. By reasonably controlling the ratio, the inclination angle of the image side surface of the third lens and the image side surface of the second lens can be effectively controlled, reducing the risk of ghost images between the third lens and the second lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 Schematic diagram of the structure of a lens assembly of an optical imaging lens embodiment 1 of the present invention;

[0032] Figure 2a to Figure 2d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens embodiment 1 of the present invention;

[0033] Figure 3 Schematic diagram of the lens group structure of Embodiment 2 of the optical imaging lens of the present invention;

[0034] Figures 4a to 4d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 2 of the optical imaging lens of the present invention;

[0035] Figure 5 Schematic diagram of the lens group structure of Embodiment 3 of the optical imaging lens of the present invention;

[0036] Figures 6a to 6d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of Example 3 of the optical imaging lens of the present invention;

[0037] Figure 7 Schematic diagram of the lens group structure of Embodiment 4 of the optical imaging lens of the present invention;

[0038] Figures 8a to 8d They are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 4 of the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] 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 invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0041] 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.

[0042] 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.

[0043] In the description of the present invention, 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.

[0044] 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 way unless explicitly defined in this article.

[0045] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0046] Exemplary Embodiments

[0047] The optical imaging lens of an exemplary embodiment of the present invention includes six lenses, which include, in order from the object side to the image side along the optical axis: a first lens, a second lens, an aperture, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein each lens is independent of each other and has an air gap between each lens on the optical axis.

[0048] In this exemplary embodiment, the optical system includes, in order from the object side to the image side along the optical axis: a first lens having optical focal power; a second lens having negative optical focal power, whose object side surface is convex; an aperture; a third lens having optical focal power; a fourth lens having optical focal power; a fifth lens having positive optical focal power; and a sixth lens having optical focal power.

[0049] In this exemplary embodiment, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy: 1.0<R3 / R4<3.5. By reasonably controlling the positive and negative distribution of the focal length of each component of the system, the low-order aberrations of the control system can be effectively balanced, and controlling the ratio of the radius of curvature of the second lens can reduce the sensitivity of the tolerance and maintain the miniaturization of the system. More specifically, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy: 1.20<R3 / R4<3.15.

[0050] In this exemplary embodiment, the on-axis distance SAG31 between the intersection of the object side of the third lens and the optical axis to the effective radius vertex of the object side of the third lens and the on-axis distance SAG21 between the intersection of the object side of the second lens and the optical axis to the effective radius vertex of the object side of the second lens satisfy: 2.4<SAG31 / SAG21<6.8. By reasonably controlling this ratio, the inclination angle of the image side of the third lens and the image side of the second lens can be effectively controlled to reduce the risk of ghost images between the third lens and the second lens. More specifically, the on-axis distance SAG31 between the intersection of the object side of the third lens and the optical axis to the effective radius vertex of the object side of the third lens and the on-axis distance SAG21 between the intersection of the object side of the second lens and the optical axis to the effective radius vertex of the object side of the second lens satisfy: 2.40<SAG31 / SAG21<6.75.

[0051] In this exemplary embodiment, the center thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens satisfy: 3.0<CT4 / ET4<3.5. By controlling the ratio of the center thickness and the edge thickness of the fourth lens, the thickness ratio of the fourth lens can be controlled to prevent the problem of the fourth lens being too thick or too thin during the design process, ensure the processing feasibility of the fourth lens, and also avoid difficulties in the later molding stress, coating, etc. More specifically, the center thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens satisfy: 3.10<CT4 / ET4<3.30.

[0052] In this exemplary embodiment, the maximum field of view FOV of the imaging lens satisfies: FOV>90°. By optimizing the optical system, the maximum field of view of the imaging lens is greater than 90°, thereby achieving the wide-angle characteristic of the system. More specifically, the maximum field of view FOV of the imaging lens satisfies: FOV>95°.

[0053] In this exemplary embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD<2.5. By allocating the system focal power, the F number of the imaging system is less than 2.5, completing the large aperture feature of the system. More specifically, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD<2.10.

[0054] In this exemplary embodiment, the axial distance TTL from the object side of the first lens to the imaging surface and half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy: TTL / ImgH<1.6. By constraining the total length of the imaging system to a half-image surface ratio of less than 1.6, the ultra-thin feature of the optical system is achieved. More specifically, the axial distance TTL from the object side of the first lens to the imaging surface and half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy: TTL / ImgH<1.55.

[0055] In this exemplary embodiment, the on-axis distance SAG51 between the intersection of the fifth lens object side and the optical axis to the effective radius vertex of the fifth lens object side and the on-axis distance SAG62 between the intersection of the sixth lens image side and the optical axis to the effective radius vertex of the sixth lens image side satisfy: 1.5<SAG62 / SAG51<2.5. By reasonably controlling this ratio, the inclination angles of the image side of the fifth lens and the image side of the sixth lens can be effectively controlled to reduce the risk of ghost images between the fifth lens and the sixth lens. More specifically, the on-axis distance SAG51 between the intersection of the fifth lens object side and the optical axis to the effective radius vertex of the fifth lens object side and the on-axis distance SAG62 between the intersection of the sixth lens image side and the optical axis to the effective radius vertex of the sixth lens image side satisfy: 1.52<SAG62 / SAG51<2.40.

[0056] In this exemplary embodiment, the edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: 1.5<CT1 / ET1<2.0. By controlling the ratio of the center thickness to the edge thickness of the first lens, the uneven thickness of the lens during the design process is effectively prevented. More specifically, the edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: 1.70<CT1 / ET1<1.95.

[0057] In this exemplary embodiment, the combined focal length f123 of the first lens, the second lens, and the third lens and the effective focal length f of the optical imaging lens satisfy: 1.5<f123 / f<3.0. By constraining the ratio of the combined focal length of the first lens, the second lens, and the third lens to the effective focal length of the optical imaging lens to be within a certain range, the field curvature of the system can be reasonably controlled within a certain range. More specifically, the combined focal length f123 of the first lens, the second lens, and the third lens and the effective focal length f of the optical imaging lens satisfy: 1.70<f123 / f<2.70.

[0058] In this exemplary embodiment, half of the diagonal length of the effective pixel area on the imaging plane ImgH and the on-axis distance TD from the object side of the first lens to the image side of the last lens satisfy: 0.5<ImgH / TD<1.5. By constraining the ratio of half of the diagonal length of the effective pixel area on the imaging plane to the on-axis distance from the object side of the first lens to the image side of the last lens, the field of view size is effectively controlled to obtain better imaging quality. More specifically, half of the diagonal length of the effective pixel area on the imaging plane ImgH and the on-axis distance TD from the object side of the first lens to the image side of the last lens satisfy: 0.75<ImgH / TD<1.20.

[0059] In this exemplary embodiment, the air interval T45 between the fourth lens and the fifth lens on the optical axis and the air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 3.7<T56 / T45<8.4. By constraining the ratio of the air interval between the fifth lens and the fourth lens to the air interval between the fourth lens and the fifth lens, the field curvature contribution of each field of view can be controlled within a reasonable range. More specifically, the air interval T45 between the fourth lens and the fifth lens on the optical axis and the air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 3.75<T56 / T45<8.35.

[0060] In this exemplary embodiment, the distance SD from the aperture to the image side surface of the last lens and the sum of the air intervals on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface ∑AT satisfy: 2.0<SD / ∑AT<3.1. By controlling the ratio of the distance from the aperture to the image side surface of the last lens and the sum of the air intervals on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface, the distortion contribution of each field of view of the optical imaging lens is controlled within a reasonable range to improve the imaging quality. More specifically, the distance SD from the aperture to the image side surface of the last lens and the sum of the air intervals on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface ∑AT satisfy: 2.45<SD / ∑AT<3.1.

[0061] In this exemplary embodiment, the absolute value of optical distortion |OPD| satisfies: |OPD|<1.5%. The optical distortion of the imaging lens is controlled to be less than 1.5%, so that the lens has the characteristic of small distortion. More specifically, the absolute value of optical distortion |OPD| satisfies: |OPD|<1.5%.

[0062] In this exemplary embodiment, the object side surface and the image side surface of any lens of the first lens E1 to the sixth lens E6 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:

[0063]

[0064] 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); k is the cone coefficient; Ai is the correction coefficient of the i-th order aspheric surface.

[0065] In this exemplary embodiment, the optical imaging lens may further include a stop. The stop may be disposed at an appropriate position as required, for example, the stop may be disposed between the object side and the first lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0066] The optical imaging lens according to the above embodiment of the present invention may use multiple lenses, such as the above six lenses. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, the optical imaging lens has a larger imaging surface, a wide imaging range, and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[0067] In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side of the first lens to the image side of the sixth lens is an aspherical mirror surface. The characteristics of the aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike the spherical lens with a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side and image side of each lens in 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, the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspherical mirror surfaces.

[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 seven lenses are described as an example in the embodiments, the optical imaging lens is not limited to including seven lenses, and the optical imaging lens may also include other numbers of lenses if necessary.

[0069] Specific embodiments of the optical imaging lens applicable to the above embodiments are further described below with reference to the accompanying drawings. Specific embodiment 1

[0071] Figure 1 1 is a schematic diagram of the lens group structure of Embodiment 1 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture 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.

[0072] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each of the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0073] As shown in Table 1, it is a basic parameter table of the optical imaging lens of Example 1, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0074]

[0075]

[0076] Table 1

[0077] As shown in Table 2, in Example 1, the total effective focal length of the optical imaging lens is f=3.38 mm, the distance TTL 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 is 5.11 mm, and half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH=3.71 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV=47.8°. The axial distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens is -0.06. The axial distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens is -0.09. The edge thickness ET4 of the fourth lens is 0.25.

[0078]

[0079] Table 2

[0080] The optical imaging lens in Example 1 satisfies:

[0081] R3 / R4=1.23; wherein R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0082] SAG31 / SAG21=3.43; wherein, SAG31 is the on-axis distance between the intersection of the object side of the third lens and the optical axis to the vertex of the effective radius of the object side of the third lens, and SAG21 is the on-axis distance between the intersection of the object side of the second lens and the optical axis to the vertex of the effective radius of the object side of the second lens.

[0083] CT4 / ET4=3.11; wherein CT4 is the center thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens.

[0084] FOV = 95.6°; FOV is the maximum field of view of the imaging lens.

[0085] f / EPD=2.05; wherein f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

[0086] TTL / ImgH=1.38; wherein TTL is the axial distance from the object side of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0087] SAG62 / SAG51=1.55; wherein, SAG51 is the on-axis distance between the intersection of the object side of the fifth lens and the optical axis to the vertex of the effective radius of the object side of the fifth lens, and SAG62 is the on-axis distance between the intersection of the image side of the sixth lens and the optical axis to the vertex of the effective radius of the image side of the sixth lens.

[0088] CT1 / ET1=1.91; wherein ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.

[0089] f123 / f=2.10; wherein f123 is the combined focal length of the first lens, the second lens and the third lens, and f is the effective focal length of the optical imaging lens.

[0090] ImgH / TD=0.85; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane, and TD is the axial distance from the object side of the first lens to the image side of the last lens.

[0091] T56 / T45=8.31; wherein T45 is the air space between the fourth lens and the fifth lens on the optical axis, and T56 is the air space between the fifth lens and the sixth lens on the optical axis.

[0092] SD / ∑AT=2.49; wherein SD is the distance from the aperture to the image side of the last lens, and ∑AT is the sum of the air intervals on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface.

[0093] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 3 shows the high-order coefficients A of the aspherical mirror surfaces S1-S12 that can be used in Example 1. 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 .

[0094]

[0095]

[0096] Table 3

[0097] Figure 2a The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 2b The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image 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. Figure 2a to Figure 2d It can be seen from the figure that the optical imaging lens provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0099] Figure 3 2 is a schematic diagram of the lens group structure of an optical imaging lens embodiment 2 of the present invention. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture 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.

[0100] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each surface of surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0101] As shown in Table 4, it is a basic parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0102]

[0103]

[0104] Table 4

[0105] As shown in Table 5, in Example 2, the total effective focal length of the optical imaging lens is f=3.21 mm, the distance TTL 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 is 5.12 mm, and half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH=3.41 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV=47.8°. The axial distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens is 0.25. The axial distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens is 0.40. The edge thickness ET4 of the fourth lens is 0.25.

[0106]

[0107] Table 5

[0108] The optical imaging lens in Example 2 satisfies:

[0109] R3 / R4=1.63; wherein R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0110] SAG31 / SAG21=6.41; wherein, SAG31 is the on-axis distance between the intersection of the object side of the third lens and the optical axis to the vertex of the effective radius of the object side of the third lens, and SAG21 is the on-axis distance between the intersection of the object side of the second lens and the optical axis to the vertex of the effective radius of the object side of the second lens.

[0111] CT4 / ET4=3.28; wherein CT4 is the center thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens.

[0112] FOV = 95.6°; FOV is the maximum field of view of the imaging lens.

[0113] f / EPD=2.05; wherein f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

[0114] TTL / ImgH=1.50; wherein TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0115] SAG62 / SAG51=1.58; wherein, SAG51 is the on-axis distance between the intersection of the object side of the fifth lens and the optical axis to the vertex of the effective radius of the object side of the fifth lens, and SAG62 is the on-axis distance between the intersection of the image side of the sixth lens and the optical axis to the vertex of the effective radius of the image side of the sixth lens.

[0116] CT1 / ET1=1.80; wherein ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.

[0117] f123 / f=2.44; wherein f123 is the combined focal length of the first lens, the second lens and the third lens, and f is the effective focal length of the optical imaging lens.

[0118] ImgH / TD=0.78; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane, and TD is the axial distance from the object side of the first lens to the image side of the last lens.

[0119] T56 / T45=5.61; wherein T45 is the air space between the fourth lens and the fifth lens on the optical axis, and T56 is the air space between the fifth lens and the sixth lens on the optical axis.

[0120] SD / ∑AT=3.09; wherein SD is the distance from the aperture to the image side of the last lens, and ∑AT is the sum of the air intervals on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface.

[0121] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 6 shows the high-order coefficients A of the aspherical mirror surfaces S1-S12 that can be used in Example 2. 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 .

[0122]

[0123] Table 6

[0124] 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. Figures 4a to 4d It can be seen from the figure that the optical imaging lens provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0126] Figure 5 Schematic diagram of the lens group structure of Embodiment 3 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture 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.

[0127] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each surface of surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0128] As shown in Table 7, it is a basic parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0129]

[0130]

[0131] Table 7

[0132] As shown in Table 8, in Example 3, the total effective focal length of the optical imaging lens is f=3.25 mm, the distance TTL 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 is 5.11 mm, and half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH=3.45 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV=47.8°. The axial distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens is 0.26. The axial distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens is 0.48. The edge thickness ET4 of the fourth lens is 0.25.

[0133]

[0134] Table 8

[0135] The optical imaging lens in Example 3 satisfies:

[0136] R3 / R4=2.19; wherein R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0137] SAG31 / SAG21=6.74; wherein, SAG31 is the on-axis distance between the intersection of the object side of the third lens and the optical axis to the vertex of the effective radius of the object side of the third lens, and SAG21 is the on-axis distance between the intersection of the object side of the second lens and the optical axis to the vertex of the effective radius of the object side of the second lens.

[0138] CT4 / ET4=3.27; wherein CT4 is the center thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens.

[0139] FOV = 95.6°; FOV is the maximum field of view of the imaging lens.

[0140] f / EPD=2.05; wherein f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

[0141] TTL / ImgH=1.48; wherein TTL is the axial distance from the object side of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0142] SAG62 / SAG51=1.85; wherein, SAG51 is the on-axis distance between the intersection of the object side of the fifth lens and the optical axis to the vertex of the effective radius of the object side of the fifth lens, and SAG62 is the on-axis distance between the intersection of the image side of the sixth lens and the optical axis to the vertex of the effective radius of the image side of the sixth lens.

[0143] CT1 / ET1=1.78; wherein ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.

[0144] f123 / f=2.44; wherein f123 is the combined focal length of the first lens, the second lens and the third lens, and f is the effective focal length of the optical imaging lens.

[0145] ImgH / TD=0.79; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane, and TD is the axial distance from the object side of the first lens to the image side of the last lens.

[0146] T56 / T45=5.49; wherein T45 is the air space between the fourth lens and the fifth lens on the optical axis, and T56 is the air space between the fifth lens and the sixth lens on the optical axis.

[0147] SD / ∑AT=2.91; wherein SD is the distance from the aperture to the image side of the last lens, and ∑AT is the sum of the air intervals on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface.

[0148] In Example 3, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 9 shows the high-order coefficients A of the aspherical mirror surfaces S1-S12 that can be used in Example 3. 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 .

[0149]

[0150] Table 9

[0151] Figure 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. Figure 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. Figures 6a to 6d It can be seen from the figure that the optical imaging lens provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0153] Figure 7 Schematic diagram of the lens group structure of embodiment 4 of the optical imaging lens of the present invention. The optical imaging lens includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, an aperture 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.

[0154] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each surface of surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0155] As shown in Table 10, it is a basic parameter table of the optical imaging lens of Example 4, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0156]

[0157] Table 10

[0158] As shown in Table 11, in Example 4, the total effective focal length of the optical imaging lens is f=3.23 mm, the distance TTL 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 is 5.07 mm, and half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH=3.43 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV=47.8°. The axial distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens is 0.06. The axial distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens is 0.13. The edge thickness ET4 of the fourth lens is 0.26.

[0159]

[0160] Table 11

[0161] The optical imaging lens in Example 4 satisfies:

[0162] R3 / R4=3.11; wherein R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0163] SAG31 / SAG21=2.45; wherein, SAG31 is the on-axis distance between the intersection of the object side of the third lens and the optical axis to the vertex of the effective radius of the object side of the third lens, and SAG21 is the on-axis distance between the intersection of the object side of the second lens and the optical axis to the vertex of the effective radius of the object side of the second lens.

[0164] CT4 / ET4=3.15; wherein CT4 is the center thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens.

[0165] FOV = 95.6°; FOV is the maximum field of view of the imaging lens.

[0166] f / EPD=2.05; wherein f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

[0167] TTL / ImgH=1.48; wherein TTL is the axial distance from the object side of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0168] SAG62 / SAG51=2.35; wherein, SAG51 is the on-axis distance between the intersection of the object side of the fifth lens and the optical axis to the vertex of the effective radius of the object side of the fifth lens, and SAG62 is the on-axis distance between the intersection of the image side of the sixth lens and the optical axis to the vertex of the effective radius of the image side of the sixth lens.

[0169] CT1 / ET1=1.72; wherein ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.

[0170] f123 / f=2.69; wherein f123 is the combined focal length of the first lens, the second lens and the third lens, and f is the effective focal length of the optical imaging lens.

[0171] ImgH / TD=0.79; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane, and TD is the axial distance from the object side of the first lens to the image side of the last lens.

[0172] T56 / T45=3.76; wherein T45 is the air space between the fourth lens and the fifth lens on the optical axis, and T56 is the air space between the fifth lens and the sixth lens on the optical axis.

[0173] SD / ∑AT=2.98; wherein SD is the distance from the aperture to the image side of the last lens, and ∑AT is the sum of the air intervals on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface.

[0174] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 12 shows the high-order coefficients A of the aspherical mirror surfaces S1-S12 that can be used in Example 4. 4 , A 6 , A 8 , A 10 , A12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0175]

[0176] Table 12

[0177] Figure 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 8c The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 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. Figures 8a to 8d It can be seen from the figure that the optical imaging lens provided in Example 4 can achieve good imaging quality.

[0178] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, It is characterized in that The optical imaging lens has six lenses with optical power, and the optical imaging lens includes, in order from the object side to the image side along the optical axis: The first lens has positive refractive power, and its object side surface is convex and its image side surface is concave; The second lens has a negative optical power, and its object side surface is convex and its image side surface is concave; Aperture; a third lens having negative optical power; a fourth lens element having positive refractive power and a convex image-side surface; a fifth lens element having positive refractive power and a convex image-side surface; a sixth lens having negative optical power, whose object side surface is convex and whose image side surface is concave; 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: 1.23≤R3 / R4≤3.11; The combined focal length f123 of the first lens, the second lens and the third lens and the effective focal length f of the optical imaging lens satisfy: 1.72≤f123 / f≤2.69; An air interval T45 between the fourth lens and the fifth lens on the optical axis and an air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 3.76≤T56 / T45≤8.

31.

2. The optical imaging lens according to claim 1, It is characterized in that The on-axis distance SAG31 between the intersection of the third lens object side and the optical axis to the effective radius vertex of the third lens object side and the on-axis distance SAG21 between the intersection of the second lens object side and the optical axis to the effective radius vertex of the second lens object side satisfy: 2.4<SAG31 / SAG21≤6.

74.

3. The optical imaging lens according to claim 1, It is characterized in that The maximum field of view FOV of the optical imaging lens satisfies: FOV = 95.6°.

4. The optical imaging lens according to claim 1, It is characterized in that The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD=2.

05.

5. The optical imaging lens according to claim 1, It is characterized in that The axial distance TTL from the object side of the first lens to the imaging plane and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following: 1.38≤TTL / ImgH≤1.

5.

6. The optical imaging lens according to claim 1, It is characterized in that The on-axis distance SAG51 between the intersection of the fifth lens object side and the optical axis to the effective radius vertex of the fifth lens object side and the on-axis distance SAG62 between the intersection of the sixth lens image side and the optical axis to the effective radius vertex of the sixth lens image side satisfy: 1.5<SAG62 / SAG51≤2.

35.

7. The optical imaging lens according to claim 1, It is characterized in that The edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: 1.72≤CT1 / ET1≤1.

91.

8. The optical imaging lens according to claim 1, It is characterized in that Half of the diagonal length of the effective pixel area on the imaging plane ImgH and the axial distance TD from the object side of the first lens to the image side of the last lens satisfy: 0.89≤ImgH / TD≤1.

13.

9. The optical imaging lens according to claim 1, It is characterized in that The distance SD from the aperture to the image side surface of the last lens and the sum ∑AT of the air interval on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface satisfy: 2.49≤SD / ∑AT<3.

1.

10. The optical imaging lens according to claim 1, It is characterized in that The absolute value of optical distortion |OPD| satisfies: |OPD|<1.5%.

Images