A photographic lens

Abstract

The application discloses a photographic lens, which comprises, in sequence from the object side to the image side along the optical axis, a first lens with negative refractive power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with refractive power, the image side of which is a concave surface; a third lens with refractive power; a diaphragm; a fourth lens with positive refractive power, the object side of which is a convex surface; a fifth lens with refractive power; a sixth lens with refractive power, the object side of which is a convex surface and the image side of which is a concave surface; wherein half of the diagonal length of the effective pixel area on the imaging surface is Imgh, the axial distance from the object side of the first lens to the image side of the sixth lens is TD, and the maximum field of view angle of the photographic lens is FOV, and the following conditions are met: 0.9 < Imgh / TD x TAN(FOV / 2) < 2.5. Based on the technical scheme, the ratio of the lens length to the lens image height can be controlled, the lens miniaturization can be realized, and the space utilization rate of the whole machine can be improved. The production cost can be reduced while the machinability of the lens is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of photography, and particularly relates to a photographic lens comprising six lenses. BACKGROUND

[0002] The existing portable terminals such as smart phones, pads and the like mainly rely on rear cameras when taking pictures in daily life. However, with the increasing demand of users for taking pictures, such as super wide angle and super long focus, the size of the camera lens is becoming larger and larger. Since the existing mobile phone manufacturers mainly design smart phones, pads and the like to be thin and light, the existing smart phones are becoming thinner and thinner, but the installed cameras are becoming more and more prominent. On the one hand, the prominent camera makes the appearance of the terminal not very beautiful, and on the other hand, the prominent camera is more likely to be damaged by collision.

[0003] The present application provides a photographic lens with a smaller size, which satisfies the improvement of the space utilization of the whole machine. SUMMARY

[0004] The present application aims to provide a photographic lens comprising six lenses, which has a smaller size and satisfies the improvement of the space utilization of the whole machine.

[0005] The present application provides a photographic lens, which comprises, in order from the object side to the image side along the optical axis: a first lens with negative refractive power, the object side surface of which is a convex surface and the image side surface of which is a concave surface; a second lens with refractive power, the image side surface of which is a concave surface; a third lens with refractive power; a diaphragm; a fourth lens with positive refractive power, the object side surface of which is a convex surface; a fifth lens with refractive power; and a sixth lens with refractive power, the object side surface of which is a convex surface and the image side surface of which is a concave surface; wherein the air separation thickness T12 of the first lens and the second lens on the optical axis, the air separation thickness T23 of the second lens and the third lens on the optical axis, and the air separation thickness T45 of the fourth lens and the fifth lens on the optical axis satisfy: 12.5 < (T12+T23) / T45 < 34.

[0006] According to one embodiment of the present application, the edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis satisfy: 0.7 < ET6 / CT6 < 1.2.

[0007] According to one embodiment of the present application, the sum ∑CT of the center thicknesses of the first to sixth lenses on the optical axis and the sum ∑AT of the air separation thicknesses between any two adjacent lenses of the first to sixth lenses on the optical axis satisfy: 1.9 < ∑CT / ∑AT < 2.7.

[0008] According to one embodiment of the present invention, the center thickness CT3 of the third lens on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: CT3 / CT5 < 21.

[0009] According to one embodiment of the present invention, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy: 1.1 < -f1 / f4 < 5.8.

[0010] According to one embodiment of the present invention, Imgh (half the diagonal length of the effective pixel area on the imaging plane), TD (the axial distance TD from the object-side surface of the first lens to the image-side surface of the sixth lens), and the maximum field of view (FOV) of the photographic lens satisfy: 0.9 <Imgh / TD×TAN(FOV / 2)<2.5。

[0011] According to one embodiment of the present invention, the center thickness CT4 of the fourth lens on the optical axis, the effective focal length f4 of the fourth lens, the center thickness CT5 of the fifth lens, the effective focal length f5 of the fifth lens, the center thickness CT6 of the sixth lens, and the effective focal length f6 of the sixth lens satisfy: 0.3 < CT4 / f4 - CT5 / f5 + CT6 / f6 < 1.5.

[0012] According to one embodiment of the present invention, the radius of curvature R4 of the image side of the second lens and the radius of curvature R5 of the object side of the third lens satisfy: 0 < (R5 - R4) / (R5 + R4) < 2.

[0013] According to one embodiment of the present invention, the radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens satisfy: 0 < |R11-R12| / CT6 < 2.2.

[0014] According to one embodiment of the present invention, the distance SD from the aperture to the image side of the sixth lens on the optical axis and the distance TTL from the object side of the first lens to the imaging surface on the optical axis satisfy: 0.2 < SD / TTL < 0.4.

[0015] The beneficial effects of this invention are:

[0016] This invention provides a photographic lens comprising multiple lenses, such as a first lens to a sixth lens. By controlling the ratio of lens length to image height, lens miniaturization can be achieved, improving overall space utilization. By controlling the center and edge thickness of the photographic lens elements, production costs can be reduced while ensuring lens manufacturability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the lens group structure of Embodiment 1 of the photographic lens of the present invention;

[0019] Figures 2a-2b These are the astigmatism curve and distortion curve of the photographic lens embodiment 1 of the present invention, respectively;

[0020] Figure 3 This is a schematic diagram of the lens group structure of Embodiment 2 of the photographic lens of the present invention;

[0021] Figures 4a-4b These are the astigmatism curve and distortion curve of the photographic lens embodiment 2 of the present invention, respectively;

[0022] Figure 5 This is a schematic diagram of the lens group structure of embodiment 3 of the photographic lens of the present invention;

[0023] Figures 6a-6b These are the astigmatism curve and distortion curve of the photographic lens embodiment 3 of the present invention, respectively;

[0024] Figure 7 This is a schematic diagram of the lens group structure of embodiment 4 of the photographic lens of the present invention;

[0025] Figures 8a-8b These are the astigmatism curve and distortion curve of the photographic lens embodiment 4 of the present invention, respectively;

[0026] Figure 9 This is a schematic diagram of the lens group structure of embodiment 5 of the photographic lens of the present invention;

[0027] Figures 10a-10b These are the astigmatism curve and distortion curve of the photographic lens embodiment 5 of the present invention, respectively. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0030] It should also be understood that the terms "comprising," "including," "having," "containing," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0031] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0032] In the description of this invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 plane is called the image-side surface of the lens.

[0033] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized manner unless expressly so specified herein.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The features, principles, and other aspects of the present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] Exemplary Implementation

[0036] The photographic lens according to an exemplary embodiment of the present invention includes six lenses, which are sequentially arranged 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. Among them, each lens is independent of each other, and there is an air gap on the optical axis between each lens.

[0037] In this exemplary embodiment, the photographic lens includes: a first lens with a negative optical power, whose object side is convex and image side is concave; a second lens with an optical power, whose image side is concave; a third lens with an optical power; an aperture stop; a fourth lens with a positive optical power, whose object side is convex; a fifth lens with an optical power; a sixth lens with an optical power, whose object side is convex and image side is concave.

[0038] In this exemplary embodiment, half of the diagonal length of the effective pixel region on the imaging surface ImgH and the on-axis distance TTL from the object side of the first lens to the image side of the sixth lens satisfy: 0.9 < Imgh / TD × TAN(FOV / 2) < 2.5; by controlling the ratio of the lens length to the lens image height, lens miniaturization can be achieved, and the overall space utilization rate of the machine can be improved. More specifically, half of the diagonal length of the effective pixel region on the imaging surface ImgH and the on-axis distance TTL from the object side of the first lens to the image side of the sixth lens satisfy: 0.91 < Imgh / TD × TAN(FOV / 2) < 2.49.

[0039] In this exemplary embodiment, the edge thickness ET6 of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.7 < ET6 / CT6 < 1.2; by controlling the ratio of the central thickness to the edge thickness of the lens, the processability of the lens can be ensured, and the production cost can be reduced. More specifically, the edge thickness ET6 of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.71 < ET6 / CT6 < 1.19.

[0040] In this exemplary embodiment, the sum ∑CT of the central thicknesses of the first lens to the sixth lens on the optical axis and the sum ∑AT of the air gap thicknesses between any two adjacent lenses of the first lens to the sixth lens on the optical axis satisfy: 1.9 < ∑CT / ∑AT < 2.7; by controlling the ratio of the sum of the central thicknesses of the lenses of the photographic lens to the sum of the air gaps between the lenses within this range, it is easy to process and manufacture the lens, and the overall performance can be improved. More specifically, the sum ∑CT of the central thicknesses of the first lens to the sixth lens on the optical axis and the sum ∑AT of the air gap thicknesses between any two adjacent lenses of the first lens to the sixth lens on the optical axis satisfy: 1.91 < ∑CT / ∑AT < 2.69.

[0041] In this exemplary embodiment, the center thickness CT3 of the third lens on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: CT3 / CT5 < 21. By constraining the ratio of the center thicknesses of the third and fifth lenses within a reasonable range, both processing performance and thinness are guaranteed. More specifically, the center thickness CT3 of the third lens on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: CT3 / CT5 < 20.99.

[0042] In this exemplary embodiment, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy: 1.1 < -f1 / f4 < 5.8; by controlling the deflection angles of the edge field of view of the first and fourth lenses, the sensitivity of the system can be effectively reduced. More specifically, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy: 1.11 < -f1 / f4 < 5.79.

[0043] In this exemplary embodiment, the air gap thickness T12 of the first and second lenses on the optical axis, the air gap thickness T23 of the second and third lenses on the optical axis, and the air gap thickness T45 of the fourth and fifth lenses on the optical axis satisfy: 12.5 < (T12 + T23) / T45 < 34. By reasonably allocating the median thickness of the lenses in the photographic lens, the photographic lens can have good imaging quality, reduce process sensitivity, and improve product yield. More specifically, the air gap thickness T12 of the first and second lenses on the optical axis, the air gap thickness T23 of the second and third lenses on the optical axis, and the air gap thickness T45 of the fourth and fifth lenses on the optical axis satisfy: 12.51 < (T12 + T23) / T45 < 33.99.

[0044] In this exemplary embodiment, the center thickness CT4 of the fourth lens on the optical axis, the effective focal length f4 of the fourth lens, the center thickness CT5 of the fifth lens, the effective focal length f5 of the fifth lens, the center thickness CT6 of the sixth lens, and the effective focal length f6 of the sixth lens satisfy: 0.3 < CT4 / f4 - CT5 / f5 + CT6 / f6 < 1.5. By reasonably allocating the focal length and center thickness of the photographic lenses, the system can achieve good imaging quality, reduce process sensitivity, and improve product yield. More specifically, the center thickness CT4 of the fourth lens on the optical axis, the effective focal length f4 of the fourth lens, the center thickness CT5 of the fifth lens, the effective focal length f5 of the fifth lens, the center thickness CT6 of the sixth lens, and the effective focal length f6 of the sixth lens satisfy: 0.31 < CT4 / f4 - CT5 / f5 + CT6 / f6 < 1.49.

[0045] In this exemplary embodiment, the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R5 of the object-side surface of the third lens satisfy: 0 < (R5 - R4) / (R5 + R4) < 2; by constraining the radii of curvature of the second and third lenses within a reasonable range, processing performance can be guaranteed. More specifically, the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R5 of the object-side surface of the third lens satisfy: 0.01 < (R5 - R4) / (R5 + R4) < 1.99.

[0046] In this exemplary embodiment, the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0 < |R11-R12| / CT6 < 2.2. By controlling the ratio of the radius of curvature and the thickness of the sixth lens, the incident angle of the principal rays in each field of view of the photographic lens on the image plane can be reasonably controlled, meeting the requirements of the principal ray incident angle in the optical system design. More specifically, the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0.01 < |R11-R12| / CT6 < 2.19.

[0047] In this exemplary embodiment, the distance SD from the aperture stop to the image side of the sixth lens on the optical axis and the distance TTL from the object side of the first lens to the imaging plane on the optical axis satisfy: 0.2 < SD / TTL < 0.4. By controlling the distance from the aperture stop to the image side of the last lens on the optical axis, the distance from the object side of the first lens to the imaging plane on the optical axis, and the ratio of the curvature radius of the fourth lens's object side and image side to the thickness of the sixth lens, the lens can be made easier to manufacture, improving overall performance. More specifically, the distance SD from the aperture stop to the image side of the sixth lens on the optical axis and the distance TTL from the object side of the first lens to the imaging plane on the optical axis satisfy: 0.21 < SD / TTL < 0.39.

[0048] In this exemplary embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0049]

[0050] Where x is the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface.

[0051] In this exemplary embodiment, the photographic lens may further include an aperture stop. The aperture stop may be positioned as needed, for example, it may be positioned between the third lens and the fourth lens. Optionally, the photographic lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging plane.

[0052] The photographic lens according to the above embodiments of the present invention can employ multiple lenses, such as the six lenses described above. By rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis spacing between each lens, the photographic lens has a large imaging plane, resulting in a wide imaging range and high imaging quality, while ensuring the ultra-thinness of the mobile phone.

[0053] In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspherical mirror surface; that is, at least one mirror surface from the object-side surface of the first lens to the image-side surface of the sixth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that its curvature changes continuously from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has better curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. Using an aspherical lens can eliminate aberrations that occur during imaging as much as possible, thereby improving image quality. Optionally, at least one of the object-side and image-side surfaces of each of the first, second, third, fourth, fifth, and sixth lenses is an aspherical mirror surface. Optionally, both the object-side and image-side surfaces of each of the first, second, third, fourth, fifth, and sixth lenses are aspherical mirror surfaces.

[0054] However, those skilled in the art will understand that the number of lenses constituting the photographic lens can be changed to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although six lenses are described as an example in the embodiments, the photographic lens is not limited to including six lenses, and may include other numbers of lenses if necessary.

[0055] The following describes a specific embodiment of the photographic lens applicable to the above embodiments with reference to the accompanying drawings. Specific Implementation Example 1

[0057] Figure 1 This is a schematic diagram of the lens group structure of embodiment 1 of the photographic lens of the present invention. The photographic lens includes, in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0058] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0059] Table 1 shows the basic parameters of the photographic lens in Example 1, where the units for radius of curvature, thickness, and focal length are all millimeters (mm).

[0060]

[0061] Table 1

[0062] As shown in Table 2, in Example 1, the total effective focal length of the camera lens is f = 1.03 mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 of the camera lens on the optical axis is 7.00 mm, and half the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 1.51 mm.

[0063]

[0064]

[0065] Table 2

[0066] The camera lens in Example 1 satisfies:

[0067] ET6 / CT6 = 0.82, where ET6 is the edge thickness of the sixth lens and CT6 is the center thickness of the sixth lens on the optical axis.

[0068] ∑CT / ∑AT=2.41, where ∑CT is the sum of the center thicknesses of the first to sixth lenses on the optical axis, and ∑AT is the sum of the air gap thicknesses between any two adjacent lenses on the optical axis.

[0069] CT3 / CT5 = 3.98, where CT3 is the center thickness of the third lens on the optical axis and CT5 is the center thickness of the fifth lens on the optical axis.

[0070] Imgh / TD×tan(fov / 2)=2.31, where Imgh is half the diagonal length of the effective pixel area on the imaging plane, TD is the on-axis distance from the object side of the first lens to the image side of the sixth lens, and FOV is the maximum field of view of the camera lens.

[0071] -f1 / f4 = 3.34, where f1 is the effective focal length of the first lens and f4 is the effective focal length of the fourth lens.

[0072] (T12+T23) / T45=33.64, where T12 is the air gap thickness between the first lens and the second lens on the optical axis, T23 is the air gap thickness between the second lens and the third lens on the optical axis, and T45 is the air gap thickness between the fourth lens and the fifth lens on the optical axis.

[0073] (R5-R4) / (R4+R5)=0.54, where R4 is the radius of curvature of the image side of the second lens and R5 is the radius of curvature of the object side of the third lens.

[0074] |R11-R12| / CT6=2.02, where R11 is the radius of curvature of the object side of the sixth lens, and R12 is the radius of curvature of the image side of the sixth lens.

[0075] SD / TTL = 0.32, where SD is the distance on the optical axis from the aperture stop to the image side of the sixth lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging plane.

[0076] CT4 / f4-CT5 / f5+CT6 / f6=1.21, where CT4 is the center thickness of the fourth lens on the optical axis, f4 is the effective focal length of the fourth lens, CT5 is the center thickness of the fifth lens, f5 is the effective focal length of the fifth lens, CT6 is the center thickness of the sixth lens, and f6 is the effective focal length of the sixth lens.

[0077] In Example 1, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the sixth lens E6, are aspherical. Table 3 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S12 in Example 1. 10 A 12 A 14 and A 16 .

[0078]

[0079]

[0080] Table 3

[0081] Figure 2aThe astigmatism curve of the camera lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2b The distortion curve of the photographic lens of Embodiment 1 is shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 2a-2b As can be seen, the camera lens given in Example 1 can achieve good image quality. Specific Implementation Example 2

[0083] Figure 3 This is a schematic diagram of the lens group structure of embodiment 2 of the photographic lens of the present invention. The photographic lens includes, in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0084] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0085] Table 4 shows the basic parameters of the camera lens in Example 2, where the units for radius of curvature, thickness, and focal length are all millimeters (mm).

[0086]

[0087]

[0088] Table 4

[0089] As shown in Table 5, in Example 2, the total effective focal length of the camera lens is f = 1.04 mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 of the camera lens on the optical axis is 7.50 mm, and half the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 1.41 mm.

[0090]

[0091] Table 5

[0092] The camera lens in Example 2 satisfies:

[0093] ET6 / CT6 = 1.03, where ET6 is the edge thickness of the sixth lens and CT6 is the center thickness of the sixth lens on the optical axis.

[0094] ∑CT / ∑AT=2.10, where ∑CT is the sum of the center thicknesses of the first to sixth lenses on the optical axis, and ∑AT is the sum of the air gap thicknesses between any two adjacent lenses on the optical axis.

[0095] CT3 / CT5 = 17.7, where CT3 is the center thickness of the third lens on the optical axis and CT5 is the center thickness of the fifth lens on the optical axis.

[0096] Imgh / TD×tan(fov / 2)=1.08, where Imgh is half the diagonal length of the effective pixel area on the imaging plane, TD is the on-axis distance from the object side of the first lens to the image side of the sixth lens, and FOV is the maximum field of view of the camera lens.

[0097] -f1 / f4 = 5.59, where f1 is the effective focal length of the first lens and f4 is the effective focal length of the fourth lens.

[0098] (T12+T23) / T45=29.26, where T12 is the air gap thickness between the first lens and the second lens on the optical axis, T23 is the air gap thickness between the second lens and the third lens on the optical axis, and T45 is the air gap thickness between the fourth lens and the fifth lens on the optical axis.

[0099] (R5-R4) / (R4+R5)=0.63, where R4 is the radius of curvature of the image side of the second lens and R5 is the radius of curvature of the object side of the third lens.

[0100] |R11-R12| / CT6=0.89, where R11 is the radius of curvature of the object side of the sixth lens, and R12 is the radius of curvature of the image side of the sixth lens.

[0101] SD / TTL = 0.27, where SD is the distance on the optical axis from the aperture stop to the image side of the sixth lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging plane.

[0102] CT4 / f4-CT5 / f5+CT6 / f6=0.67, where CT4 is the center thickness of the fourth lens on the optical axis, f4 is the effective focal length of the fourth lens, CT5 is the center thickness of the fifth lens, f5 is the effective focal length of the fifth lens, CT6 is the center thickness of the sixth lens, and f6 is the effective focal length of the sixth lens.

[0103] In Example 2, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the sixth lens E6, are aspherical. Table 6 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S12 in Example 2. 10 A 12 A 14 and A 16 .

[0104] Face Number A4 A6 A8 A10 A12 A14 A16 S3 -6.2590E-02 6.8499E-02 -6.9541E-02 4.5113E-02 -1.7464E-02 3.6901E-03 -3.1616E-04 S4 3.4902E-01 -4.3721E-01 2.3483E+00 -6.1087E+00 9.0200E+00 -7.0886E+00 2.1441E+00 S5 9.4170E-02 -1.0414E-01 2.2169E-01 -3.6221E-01 3.3116E-01 -2.1576E-01 0.0000E+00 S6 -1.5018E-01 8.4057E-03 4.8265E-01 -1.2149E+01 4.9259E+01 -8.0001E+01 0.0000E+00 S7 3.1023E-01 -5.0132E-01 5.7165E+00 -4.1214E+01 1.3436E+02 -1.9215E+02 5.6347E+01 S8 -8.2079E-01 -6.2955E-01 9.2836E+00 -2.9506E+01 4.8534E+01 -6.0326E+01 3.2992E+01 S9 -8.5094E-01 -3.8172E-01 6.8301E+00 -2.1271E+01 3.9634E+01 -3.0802E+01 -8.5550E+01 S10 8.0491E-03 1.4145E+00 -3.5232E+00 1.7372E+01 -2.2925E+01 6.0990E+00 3.8036E+00 S11 3.1027E-02 4.0549E-01 -9.1698E-01 1.5788E+00 -1.4371E+00 6.3454E-01 -5.2776E-01 S12 2.4516E-01 -2.4449E-01 3.0321E-01 -3.8066E-01 3.0893E-01 -1.2106E-01 1.4432E-02

[0105] Table 6

[0106] Figure 4a The astigmatism curve of the camera lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4b The distortion curve of the camera lens in Example 2 is shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 4a-4b As can be seen from the image, the camera lens provided in Example 2 can achieve good image quality. Specific Implementation Example 3

[0108] Figure 5 This is a schematic diagram of the lens group structure of embodiment 3 of the photographic lens of the present invention. The photographic lens includes, in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0109] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0110] Table 7 shows the basic parameters of the camera lens in Example 3, where the units for radius of curvature, thickness, and focal length are all millimeters (mm).

[0111]

[0112]

[0113] Table 7

[0114] As shown in Table 8, in Example 3, the total effective focal length of the camera lens is f = 1.04 mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 of the camera lens on the optical axis is 7.50 mm, and half the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 1.41 mm.

[0115]

[0116] Table 8

[0117] The camera lens in Example 3 satisfies:

[0118] ET6 / CT6 = 1.08, where ET6 is the edge thickness of the sixth lens and CT6 is the center thickness of the sixth lens on the optical axis.

[0119] ∑CT / ∑AT=2.39, where ∑CT is the sum of the center thicknesses of the first to sixth lenses on the optical axis, and ∑AT is the sum of the air gap thicknesses between any two adjacent lenses on the optical axis.

[0120] CT3 / CT5 = 20.20, where CT3 is the center thickness of the third lens on the optical axis and CT5 is the center thickness of the fifth lens on the optical axis.

[0121] Imgh / TD×tan(fov / 2)=1.07, where Imgh is half the diagonal length of the effective pixel area on the imaging plane, TD is the on-axis distance from the object side of the first lens to the image side of the sixth lens, and FOV is the maximum field of view of the camera lens.

[0122] -f1 / f4 = 4.91, where f1 is the effective focal length of the first lens and f4 is the effective focal length of the fourth lens.

[0123] (T12+T23) / T45=26.85, where T12 is the air gap thickness between the first lens and the second lens on the optical axis, T23 is the air gap thickness between the second lens and the third lens on the optical axis, and T45 is the air gap thickness between the fourth lens and the fifth lens on the optical axis.

[0124] (R5-R4) / (R4+R5)=0.73, where R4 is the radius of curvature of the image side of the second lens and R5 is the radius of curvature of the object side of the third lens.

[0125] |R11-R12| / CT6=0.46, where R11 is the radius of curvature of the object side of the sixth lens, and R12 is the radius of curvature of the image side of the sixth lens.

[0126] SD / TTL = 0.28, where SD is the distance on the optical axis from the aperture stop to the image side of the sixth lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging plane.

[0127] CT4 / f4-CT5 / f5+CT6 / f6=0.56, where CT4 is the center thickness of the fourth lens on the optical axis, f4 is the effective focal length of the fourth lens, CT5 is the center thickness of the fifth lens, f5 is the effective focal length of the fifth lens, CT6 is the center thickness of the sixth lens, and f6 is the effective focal length of the sixth lens.

[0128] In Example 3, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the sixth lens E6, are aspherical. Table 9 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S12 in Example 3. 10 A 12 A 14 and A 16 .

[0129] Face Number A4 A6 A8 A10 A12 A14 A16 S3 -4.3467E-02 7.5499E-02 -7.2445E-02 4.3571E-02 -1.7476E-02 4.0285E-03 -3.9105E-04 S4 2.0953E-01 -3.8994E-01 2.3506E+00 -6.1828E+00 9.1728E+00 -7.1362E+00 2.1802E+00 S5 -3.3984E-02 -1.2127E-01 3.0002E-01 -4.1481E-01 1.5461E-01 -3.3499E-02 5.0814E-02 S6 -2.4813E-01 9.3442E-02 2.5458E+00 -1.0488E+01 2.1969E+01 -2.5131E+01 1.9106E+01 S7 -1.8406E-02 -4.4189E-01 7.1015E+00 -4.3086E+01 1.2766E+02 -1.9125E+02 1.1648E+02 S8 -1.6704E-01 -1.0051E+00 8.9941E+00 -2.8588E+01 5.1728E+01 -5.1770E+01 2.3577E+01 S9 -4.2364E-01 -2.1474E-01 7.0612E+00 -2.0770E+01 3.6058E+01 -3.5823E+01 1.5274E+01 S10 -1.2884E-01 1.6437E+00 -5.2082E+00 1.4516E+01 -2.2324E+01 1.6936E+01 -5.5200E+00 S11 -1.4843E-01 4.0413E-01 -1.1003E+00 1.4157E+00 -1.1918E+00 1.1313E+00 -5.7030E-01 S12 1.1854E-01 -2.0315E-01 3.0640E-01 -3.9166E-01 3.1868E-01 -1.4629E-01 3.0080E-02

[0130] Table 9

[0131] Figure 6a The astigmatism curve of the camera lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6b The distortion curve of the camera lens in Example 3 is shown, representing the distortion magnitude corresponding to different image heights. According to... Figures 6a-6b As can be seen from the image, the camera lens provided in Example 3 can achieve good image quality. Specific Implementation Example 4

[0133] Figure 7 This is a schematic diagram of the lens group structure of embodiment 4 of the present invention. The camera lens includes, in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0134] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0135] Table 10 shows the basic parameters of the camera lens in Example 4, where the units for radius of curvature, thickness, and focal length are all millimeters (mm).

[0136]

[0137]

[0138] Table 10

[0139] As shown in Table 11, in Example 4, the total effective focal length of the camera lens is f = 1.04 mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 of the camera lens on the optical axis is 7.50 mm, and half the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 1.41 mm.

[0140]

[0141] Table 11

[0142] The camera lens in Example 4 satisfies:

[0143] ET6 / CT6 = 0.93, where ET6 is the edge thickness of the sixth lens and CT6 is the center thickness of the sixth lens on the optical axis.

[0144] ∑CT / ∑AT=3.13, where ∑CT is the sum of the center thicknesses of the first to sixth lenses on the optical axis, and ∑AT is the sum of the air gap thicknesses between any two adjacent lenses on the optical axis.

[0145] CT3 / CT5 = 8.13, where CT3 is the center thickness of the third lens on the optical axis and CT5 is the center thickness of the fifth lens on the optical axis.

[0146] Imgh / TD×tan(fov / 2)=1.05, where Imgh is half the diagonal length of the effective pixel area on the imaging plane, TD is the on-axis distance from the object side of the first lens to the image side of the sixth lens, and FOV is the maximum field of view of the camera lens.

[0147] -f1 / f4 = 1.32, where f1 is the effective focal length of the first lens and f4 is the effective focal length of the fourth lens.

[0148] (T12+T23) / T45=13.04, where T12 is the air gap thickness between the first lens and the second lens on the optical axis, T23 is the air gap thickness between the second lens and the third lens on the optical axis, and T45 is the air gap thickness between the fourth lens and the fifth lens on the optical axis.

[0149] (R5-R4) / (R4+R5)=1.90, where R4 is the radius of curvature of the image side of the second lens and R5 is the radius of curvature of the object side of the third lens.

[0150] |R11-R12| / CT6=1.28, where R11 is the radius of curvature of the object side of the sixth lens, and R12 is the radius of curvature of the image side of the sixth lens.

[0151] SD / TTL = 0.31, where SD is the distance on the optical axis from the aperture stop to the image side of the sixth lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging plane.

[0152] CT4 / f4-CT5 / f5+CT6 / f6=1.12, where CT4 is the center thickness of the fourth lens on the optical axis, f4 is the effective focal length of the fourth lens, CT5 is the center thickness of the fifth lens, f5 is the effective focal length of the fifth lens, CT6 is the center thickness of the sixth lens, and f6 is the effective focal length of the sixth lens.

[0153] In Example 4, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the sixth lens E6, are aspherical. Table 12 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S12 in Example 4. 10 A 12 A 14 and A 16 .

[0154] Face Number A4 A6 A8 A10 A12 A14 A16 S3 9.8571E-02 1.1654E-01 -6.2377E-02 5.3586E-02 -1.0522E-02 3.7766E-03 -8.3446E-03 S4 1.8488E-01 -3.9882E-01 2.3952E+00 -6.2317E+00 9.1115E+00 -7.1429E+00 2.2606E+00 S5 -3.6933E-02 -9.3399E-02 2.8373E-01 -4.3075E-01 2.2474E-01 1.5535E-02 0.0000E+00 S6 -2.9967E-01 1.4609E-01 2.5822E+00 -1.1073E+01 2.0289E+01 -1.3876E+01 0.0000E+00 S7 -1.6030E-01 -4.4934E-01 7.4809E+00 -4.2676E+01 1.2643E+02 -1.9355E+02 1.1992E+02 S8 -2.6877E-01 -9.9996E-01 9.0426E+00 -2.8728E+01 5.1595E+01 -5.1671E+01 2.2083E+01 S9 -3.7346E-01 -4.6978E-01 7.1087E+00 -2.0812E+01 3.5138E+01 -3.6618E+01 1.8071E+01 S10 -1.9535E-01 1.7122E+00 -5.7062E+00 1.4234E+01 -2.1904E+01 1.7709E+01 -5.7541E+00 S11 -9.9213E-03 3.2119E-01 -9.1764E-01 1.5053E+00 -1.4620E+00 8.1366E-01 -2.0012E-01 S12 1.1218E-01 -1.9086E-01 3.2485E-01 -3.8991E-01 3.1154E-01 -1.5101E-01 3.5362E-02

[0155] Table 12

[0156] Figure 8a The astigmatism curve of the camera lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8bThe distortion curve of the camera lens in Example 4 is shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 8a-8b As can be seen from the image, the camera lens given in Example 4 can achieve good image quality. Specific Implementation Example 5

[0158] Figure 9 This is a schematic diagram of the lens group structure of embodiment 5 of the photographic lens of the present invention. The photographic lens includes, in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0159] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0160] Table 13 shows the basic parameters of the photographic lens in Example 5, where the units for radius of curvature, thickness, and focal length are all millimeters (mm).

[0161]

[0162] Table 13

[0163] As shown in Table 14, in Example 5, the total effective focal length of the camera lens is f = 1.04 mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 of the camera lens on the optical axis is 7.50 mm, and half the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 1.41 mm.

[0164]

[0165] Table 14

[0166] The camera lens in Example 5 satisfies:

[0167] ET6 / CT6 = 0.90, where ET6 is the edge thickness of the sixth lens and CT6 is the center thickness of the sixth lens on the optical axis.

[0168] ∑CT / ∑AT=2.45, where ∑CT is the sum of the center thicknesses of the first to sixth lenses on the optical axis, and ∑AT is the sum of the air gap thicknesses between any two adjacent lenses on the optical axis.

[0169] CT3 / CT5 = 3.38, where CT3 is the center thickness of the third lens on the optical axis and CT5 is the center thickness of the fifth lens on the optical axis.

[0170] Imgh / TD×tan(fov / 2)=1.04, where Imgh is half the diagonal length of the effective pixel area on the imaging plane, TD is the on-axis distance from the object side of the first lens to the image side of the sixth lens, and FOV is the maximum field of view of the camera lens.

[0171] -f1 / f4 = 3.17, where f1 is the effective focal length of the first lens and f4 is the effective focal length of the fourth lens.

[0172] (T12+T23) / T45=29.31, where T12 is the air gap thickness between the first lens and the second lens on the optical axis, T23 is the air gap thickness between the second lens and the third lens on the optical axis, and T45 is the air gap thickness between the fourth lens and the fifth lens on the optical axis.

[0173] (R5-R4) / (R4+R5)=0.55, where R4 is the radius of curvature of the image side of the second lens and R5 is the radius of curvature of the object side of the third lens.

[0174] |R11-R12| / CT6=1.89, where R11 is the radius of curvature of the object side of the sixth lens, and R12 is the radius of curvature of the image side of the sixth lens.

[0175] SD / TTL = 0.29, where SD is the distance on the optical axis from the aperture stop to the image side of the sixth lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging plane.

[0176] CT4 / f4-CT5 / f5+CT6 / f6=1.16, where CT4 is the center thickness of the fourth lens on the optical axis, f4 is the effective focal length of the fourth lens, CT5 is the center thickness of the fifth lens, f5 is the effective focal length of the fifth lens, CT6 is the center thickness of the sixth lens, and f6 is the effective focal length of the sixth lens.

[0177] In Example 5, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the sixth lens E6, are aspherical. Table 15 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S12 in Example 5. 10 A 12A 14 and A 16 .

[0178] Face Number A4 A6 A8 A10 A12 A14 A16 S3 -4.0272E-02 7.7936E-02 -7.2005E-02 4.3576E-02 -1.7498E-02 4.0230E-03 -3.9306E-04 S4 1.9369E-01 -4.2733E-01 2.3980E+00 -6.1656E+00 9.1440E+00 -7.1684E+00 2.2175E+00 S5 -8.3515E-02 -1.4015E-01 2.9912E-01 -3.9977E-01 2.2130E-01 5.0320E-03 0.0000E+00 S6 -2.9401E-01 1.7605E-01 2.3448E+00 -1.0992E+01 2.3365E+01 -1.7326E+01 0.0000E+00 S7 -1.6958E-01 -5.1981E-01 7.3956E+00 -4.3040E+01 1.2669E+02 -1.9392E+02 1.1496E+02 S8 -2.7459E-01 -8.5675E-01 8.8194E+00 -2.9114E+01 5.1749E+01 -5.0826E+01 2.1047E+01 S9 -3.7127E-01 -7.2782E-01 7.1114E+00 -2.0797E+01 3.4878E+01 -3.6722E+01 2.1193E+01 S10 -2.4435E-01 1.6755E+00 -5.8140E+00 1.4267E+01 -2.1698E+01 1.7866E+01 -5.9618E+00 S11 -5.7263E-02 3.4932E-01 -8.9872E-01 1.4830E+00 -1.4844E+00 8.1562E-01 -1.8182E-01 S12 7.9952E-02 -1.7025E-01 3.0709E-01 -3.9210E-01 3.1854E-01 -1.4827E-01 2.9826E-02

[0179] Table 12

[0180] Figure 10a The astigmatism curve of the camera lens of Embodiment 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 10b The distortion curve of the camera lens in Example 5 is shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 10a-10b As can be seen, the camera lens given in Example 5 can achieve good image quality.

[0181] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, improvements, or equivalent substitutions made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A photographic lens, characterized in that, The photographic lens has six lenses with optical power, and the photographic lens includes, in sequence from the object side to the image side along the optical axis: The first lens with negative optical power has a convex object side and a concave image side. The second lens with optical power has a convex object side and a concave image side. A third lens with optical power; Aperture; The fourth lens with positive optical power has a convex object-side surface and a convex image-side surface. The fifth lens, which has optical power, has a concave image-side surface; The sixth lens, which has optical power, has a convex object side and a concave image side. The second lens and the third lens have negative optical power, and the fifth lens and the sixth lens have positive optical power; or the second lens, the fifth lens and the sixth lens have negative optical power, and the third lens has positive optical power; or the second lens, the third lens and the sixth lens have positive optical power, and the fifth lens has negative optical power. Wherein, the air gap thickness T12 between the first lens and the second lens on the optical axis, the air gap thickness T23 between the second lens and the third lens on the optical axis, and the air gap thickness T45 between the fourth lens and the fifth lens on the optical axis satisfy: 13.04≤(T12+T23) / T45≤29.26; The following conditions must be met: Imgh (half the diagonal length of the effective pixel area on the imaging surface), TD (the on-axis distance from the object side of the first lens to the image side of the sixth lens), and the maximum field of view (FOV) of the photographic lens: 1.05 ≤ Imgh / TD × TAN(FOV / 2) ≤ 1.

08. The center thickness CT3 of the third lens on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: 8.13≤CT3 / CT5≤20.

2.

2. The photographic lens according to claim 1, characterized in that, The edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis satisfy: 0.93≤ET6 / CT6≤1.

08.

3. The photographic lens according to claim 1, characterized in that, The sum of the center thicknesses of the first lens to the sixth lens on the optical axis, ∑CT, and the sum of the air gap thicknesses between any two adjacent lenses on the optical axis, ∑AT, satisfy: 2.1≤∑CT / ∑AT≤3.

13.

4. The photographic lens according to claim 1, characterized in that, The effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy: 1.32≤-f1 / f4≤5.

59.

5. The photographic lens according to claim 1, characterized in that, The center thickness CT4 of the fourth lens on the optical axis, the effective focal length f4 of the fourth lens, the center thickness CT5 of the fifth lens, the effective focal length f5 of the fifth lens, the center thickness CT6 of the sixth lens, and the effective focal length f6 of the sixth lens satisfy: 0.56≤CT4 / f4-CT5 / f5+CT6 / f6≤1.

12.

6. The photographic lens according to claim 1, characterized in that: The radius of curvature R4 of the image side of the second lens and the radius of curvature R5 of the object side of the third lens satisfy: 0.63≤(R5-R4) / (R5+R4)≤1.

9.

7. The photographic lens according to claim 1, characterized in that: The radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens satisfy: 0.46≤|R11-R12| / CT6≤1.

28.

8. The photographic lens according to claim 1, characterized in that: The distance SD from the aperture to the image side of the sixth lens on the optical axis and the distance TTL from the object side of the first lens to the imaging plane on the optical axis satisfy: 0.27≤SD / TTL≤0.31.

Images