CN114047606B

CN114047606B - Photographic lens

Info

Publication number: CN114047606B
Application number: CN202111467742.1A
Authority: CN
Inventors: 李洋; 王浩; 邢天祥; 黄林; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2024-04-19
Anticipated expiration: 2041-12-02
Also published as: CN114047606A

Abstract

The invention provides a photographic lens. The photographic lens sequentially comprises from an object side to an image side along an optical axis: the first lens has negative focal power, and the object side surface of the first lens is a concave surface; a second lens having optical power, the second lens having a concave image-side surface; a third lens having optical power; a fourth lens with negative focal power, wherein the object side surface of the fourth lens is a concave surface; a fifth lens with optical power, wherein the object side surface of the fifth lens is a convex surface; a sixth lens having optical power; at least one of the first lens to the sixth lens is a glass lens; the on-axis distance SAG31 between the intersection point of the object side surface of the third lens and the optical axis and the effective radius vertex of the object side surface of the third lens and the on-axis distance SAG32 between the intersection point of the image side surface of the third lens and the optical axis and the effective radius vertex of the image side surface of the third lens satisfy: -2.0 < (SAG 31-SAG 32)/(SAG31+SAG32) < -1.0. The invention solves the problem that the photographic lens in the prior art has high image quality and is difficult to be compatible with high and low temperature.

Description

Photographic lens

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to a photographic lens.

Background

At present, the development of the optical imaging field is mature, taking a photographing lens of a mobile phone as an example, a traditional mobile phone lens is generally composed of a plurality of plastic lenses, so that the light weight and low cost of the mobile phone lens are guaranteed, but due to the problem of the material of the plastic lenses, deformation easily occurs in a high-temperature or low-temperature environment, and due to the limitation of materials, the image quality is sacrificed, and the final imaging effect is difficult to meet the requirements of users. Meanwhile, the size of the photographing lens is also required to be higher by a user, the ultra-thin photographing lens is ultra-thin, the photographing range is large, and the large aperture is more and more favored by the user, and meanwhile, the lens can be matched with the photosensitive element of the mobile phone stably.

That is, the photographing lens in the prior art has a problem that it is difficult to achieve both high image quality and high and low temperature adaptation.

Disclosure of Invention

The invention mainly aims to provide a photographic lens, which solves the problem that the photographic lens in the prior art has high image quality and difficult compatibility of high and low temperature adaptation.

In order to achieve the above object, according to one aspect of the present invention, there is provided a photographing lens comprising, in order from an object side to an image side along an optical axis: the first lens has negative focal power, and the object side surface of the first lens is a concave surface; a second lens having optical power, the second lens having a concave image-side surface; a third lens having optical power; a fourth lens with negative focal power, wherein the object side surface of the fourth lens is a concave surface; a fifth lens with optical power, wherein the object side surface of the fifth lens is a convex surface; a sixth lens having optical power; wherein at least one of the first lens to the sixth lens is a glass lens; the on-axis distance SAG31 between the intersection point of the object side surface of the third lens and the optical axis and the effective radius vertex of the object side surface of the third lens and the on-axis distance SAG32 between the intersection point of the image side surface of the third lens and the optical axis and the effective radius vertex of the image side surface of the third lens satisfy: -2.0 < (SAG 31-SAG 32)/(SAG31+SAG32) < -1.0.

Further, the maximum field angle FOV of the photographing lens satisfies: FOV >110 °.

Further, the effective focal length f of the photographing lens and the entrance pupil diameter EPD of the photographing lens satisfy: f/EPD < 3.5.

Further, the on-axis distance TTL from the object side surface of the first lens element to the imaging surface and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.8.

Further, the effective focal length f2 of the second lens and the curvature radius R3 of the object side surface of the second lens satisfy: 2.5 < f2/R3 < 4.5.

Further, the effective focal length f5 of the fifth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: r9/f5 is more than 1.5 and less than 7.5.

Further, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 4.0 < (R5-R6)/(R5+R6) < 11.0.

Further, the effective focal length f6 of the sixth lens and the radius of curvature R11 of the object side of the sixth lens satisfy: -10.5 < f6/R11 < -3.5.

Further, the center thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 of the sixth lens satisfy: ET6/CT6 is more than 1.0 and less than 2.0.

Further, the on-axis distance SAG52 between the center thickness CT5 of the fifth lens on the optical axis and the point of intersection of the image side surface of the fifth lens and the optical axis to the effective radius vertex of the image side surface of the fifth lens satisfies: -2.0 < CT5/SAG52 < -1.5.

Further, the center thickness CT1 of the first lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: CT3/CT1 is more than 1.5 and less than 2.5.

Further, the photographing lens further comprises a diaphragm, and the diaphragm is arranged between the second lens and the third lens.

According to another aspect of the present invention, there is provided a photographing lens including, in order from an object side to an image side along an optical axis: the first lens has negative focal power, and the object side surface of the first lens is a concave surface; a second lens having optical power, the second lens having a concave image-side surface; a third lens having optical power; a fourth lens with negative focal power, wherein the object side surface of the fourth lens is a concave surface; a fifth lens with optical power, wherein the object side surface of the fifth lens is a convex surface; a sixth lens having optical power; wherein at least one of the first lens to the sixth lens is a glass lens; the maximum field angle FOV of the photographic lens satisfies: FOV >110 °; the effective focal length f of the photographing lens and the entrance pupil diameter EPD of the photographing lens satisfy: f/EPD < 3.5.

Further, an on-axis distance SAG31 between an intersection point of the object side surface of the third lens and the optical axis and an effective radius vertex of the object side surface of the third lens and an on-axis distance SAG32 between an intersection point of the image side surface of the third lens and the optical axis and an effective radius vertex of the image side surface of the third lens satisfy: -2.0 < (SAG 31-SAG 32)/(SAG31+SAG32) < -1.0.

By applying the technical scheme of the invention, the photographic lens sequentially comprises a first lens with negative focal power, a second lens with focal power, a third lens with focal power, a fourth lens with negative focal power, a fifth lens with focal power and a sixth lens with focal power from the object side to the image side along the optical axis; the object side surface of the first lens is a concave surface; the image side surface of the second lens is a concave surface; the object side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface; wherein at least one of the first lens to the sixth lens is a glass lens; the on-axis distance SAG31 between the intersection point of the object side surface of the third lens and the optical axis and the effective radius vertex of the object side surface of the third lens and the on-axis distance SAG32 between the intersection point of the image side surface of the third lens and the optical axis and the effective radius vertex of the image side surface of the third lens satisfy: -2.0 < (SAG 31-SAG 32)/(SAG31+SAG32) < -1.0.

Through the optical power and the face type of each lens of rational distribution, can realize the characteristic of wide angle, effectively increase photographic lens's shooting scope to the rational distribution of optical power can reduce sensitivity, improves the image quality. At least one lens in the first lens to the sixth lens is a glass lens, so that the temperature drift can be effectively controlled, the photographic lens can adapt to high and low temperature environments, and the imaging quality is improved. By restricting the relational expression between the on-axis distance SAG31 between the intersection point of the object side surface of the third lens and the optical axis and the effective radius vertex of the object side surface of the third lens and the on-axis distance SAG32 between the intersection point of the image side surface of the third lens and the optical axis and the effective radius vertex of the image side surface of the third lens within a reasonable range, the processing characteristics of the third lens can be ensured.

In addition, the photographic lens has the characteristics of wide angle, strong high and low temperature adaptability, large aperture and ultra-thin, and the wide angle is wider in shooting range than that of a common lens; because the glass lens is added in the photographic lens, the imaging quality can be improved, and the photographic lens can adapt to high and low temperature environments; the large aperture ensures better image quality in a darker environment; satisfies ultra-thin, makes photographic lens holistic volume less, improves pleasing to the eye degree.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

Fig. 1 is a schematic view showing a configuration of a photographing lens according to an example one of the present invention;

fig. 2 to 4 show an on-axis chromatic aberration curve, an astigmatic curve, and a magnification chromatic aberration curve of the photographing lens of fig. 1, respectively;

Fig. 5 is a schematic view showing a configuration of a photographing lens according to an example two of the present invention;

Fig. 6 to 8 show an on-axis chromatic aberration curve, an astigmatic curve, and a magnification chromatic aberration curve of the photographing lens of fig. 5, respectively;

fig. 9 is a schematic view showing the structure of a photographic lens of example three of the present invention;

fig. 10 to 12 show an on-axis chromatic aberration curve, an astigmatic curve, and a magnification chromatic aberration curve of the photographing lens of fig. 9, respectively;

fig. 13 is a schematic view showing the structure of a photographic lens of example four of the present invention;

fig. 14 to 16 show an on-axis chromatic aberration curve, an astigmatic curve, and a magnification chromatic aberration curve of the photographing lens of fig. 13, respectively;

fig. 17 is a schematic diagram showing the configuration of a photographic lens of example five of the present invention;

fig. 18 to 20 show an on-axis chromatic aberration curve, an astigmatic curve, and a magnification chromatic aberration curve of the photographing lens of fig. 17, respectively;

fig. 21 is a schematic view showing the structure of a photographic lens of example six of the present invention;

Fig. 22 to 24 show an on-axis chromatic aberration curve, an astigmatism curve, and a magnification chromatic aberration curve of the photographing lens in fig. 21, respectively.

Wherein the above figures include the following reference numerals:

E1, a first lens; s1, an object side surface of a first lens; s2, an image side surface of the first lens; e2, a second lens; s3, the object side surface of the second lens; s4, the image side surface of the second lens; STO and diaphragm; e3, a third lens; s5, the object side surface of the third lens; s6, the image side surface of the third lens; e4, a fourth lens; s7, the object side surface of the fourth lens; s8, the image side surface of the fourth lens is provided; e5, a fifth lens; s9, the object side surface of the fifth lens; s10, an image side surface of a fifth lens; e6, a sixth lens; s11, the object side surface of the sixth lens; s12, an image side surface of the sixth lens; e7, an optical filter; s13, the object side surface of the optical filter; s14, an image side surface of the optical filter; s15, an imaging surface.

Detailed Description

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

It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.

In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present invention.

It should be noted that in the present 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 feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens near the object side becomes the object side of the lens, and the surface of each lens near the image side is called the image side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). In the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the image side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.

The invention provides a photographic lens, which aims to solve the problem that the photographic lens in the prior art has high image quality and difficult high-low temperature adaptation capability.

Example 1

As shown in fig. 1 to 24, the photographing lens includes, in order from an object side to an image side along an optical axis, a first lens having negative optical power, a second lens having optical power, a third lens having optical power, a fourth lens having negative optical power, a fifth lens having optical power, and a sixth lens having optical power; the object side surface of the first lens is a concave surface; the image side surface of the second lens is a concave surface; the object side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface; wherein at least one of the first lens to the sixth lens is a glass lens; the on-axis distance SAG31 between the intersection point of the object side surface of the third lens and the optical axis and the effective radius vertex of the object side surface of the third lens and the on-axis distance SAG32 between the intersection point of the image side surface of the third lens and the optical axis and the effective radius vertex of the image side surface of the third lens satisfy: -2.0 < (SAG 31-SAG 32)/(SAG31+SAG32) < -1.0.

Preferably, -1.9 < (SAG 31-SAG 32)/(SAG31+SAG32) < -1.3.

In the present embodiment, the maximum field angle FOV of the photographing lens satisfies: FOV >110 °. The obtained object information can be enlarged and the shooting range can be enlarged by reasonably restricting the maximum field angle FOV of the photographic lens. Preferably, FOV >118 °.

In the present embodiment, the effective focal length f of the photographing lens and the entrance pupil diameter EPD of the photographing lens satisfy: f/EPD < 3.5. The characteristic of a large aperture of the photographic lens can be realized by restraining the ratio between the effective focal length f of the photographic lens and the entrance pupil diameter EPD of the photographic lens in a reasonable range, so that the high image quality can be ensured in a dark-light environment. Preferably, f/EPD < 3.3.

In this embodiment, the on-axis distance TTL from the object side surface of the first lens element to the imaging surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.8. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length of the effective pixel area on the imaging surface is in a reasonable range, so that miniaturization is facilitated, the whole photographic lens is ensured to have a smaller volume, and the appearance attractiveness of the photographic lens is improved. Preferably, TTL/ImgH < 1.7.

In this embodiment, the effective focal length f2 of the second lens and the radius of curvature R3 of the object side surface of the second lens satisfy: 2.5 < f2/R3 < 4.5. The method meets the conditional expression, is favorable for controlling the bending degree of the second lens, and ensures that the second lens has better molding and processing characteristics. Preferably, 2.6 < f2/R3 < 4.2.

In the present embodiment, the effective focal length f5 of the fifth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: r9/f5 is more than 1.5 and less than 7.5. The curvature and the focal power of the fifth lens can be ensured by satisfying the conditional expression, and the aberration can be reduced while improving the molding processability of the fifth lens. Preferably, 1.8 < R9/f5 < 7.4.

In the present embodiment, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 4.0 < (R5-R6)/(R5+R6) < 11.0. The curvature and the focal power of the third lens can be ensured by meeting the conditional expression, the molding processability of the third lens can be improved, and meanwhile, the aberration is reduced. Preferably, 4.2 < (R5-R6)/(R5+R6) < 10.6.

In the present embodiment, the effective focal length f6 of the sixth lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: -10.5 < f6/R11 < -3.5. The curvature and focal power of the sixth lens can be ensured by meeting the conditional expression, and meanwhile, the molding processability of the sixth lens is improved, and the aberration is reduced. Preferably, -10.1 < f6/R11 < -3.9.

In the present embodiment, the center thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 of the sixth lens satisfy: ET6/CT6 is more than 1.0 and less than 2.0. The ratio of the center thickness CT6 of the sixth lens on the optical axis to the edge thickness ET6 of the sixth lens is controlled by meeting the conditional expression, so that the sixth lens has better molding and processing characteristics. Preferably, 1.2 < ET6/CT6 < 1.5.

In the present embodiment, the on-axis distance SAG52 between the center thickness CT5 of the fifth lens on the optical axis and the point of intersection of the image side surface of the fifth lens and the optical axis to the effective radius vertex of the image side surface of the fifth lens satisfies: -2.0 < CT5/SAG52 < -1.5. The center thickness of the fifth lens can be effectively ensured by meeting the conditional expression, and the processing formability of the fifth lens can be improved. Preferably, -1.9 < CT5/SAG52 < -1.6.

In the present embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: CT3/CT1 is more than 1.5 and less than 2.5. The central thicknesses of the first lens and the third lens can be reasonably distributed when the conditional expression is met, the aberration is reduced, and the assembly property is improved. Preferably, 1.9 < CT3/CT1 < 2.3.

In this embodiment, the photographing lens further includes a diaphragm disposed between the second lens and the third lens. The arrangement is favorable for effectively converging light rays entering the system, reduces the lens caliber of the optical system, ensures that the whole photographic lens is more compact, and is favorable for miniaturization.

Example two

As shown in fig. 1 to 24, the photographing lens includes, in order from an object side to an image side along an optical axis, a first lens having negative optical power, a second lens having optical power, a third lens having optical power, a fourth lens having negative optical power, a fifth lens having optical power, and a sixth lens having optical power; the object side surface of the first lens is a concave surface; the image side surface of the second lens is a concave surface; the object side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface; wherein at least one of the first lens to the sixth lens is a glass lens; the maximum field angle FOV of the photographic lens satisfies: FOV >110 °; the effective focal length f of the photographing lens and the entrance pupil diameter EPD of the photographing lens satisfy: f/EPD < 3.5.

Preferably, FOV >118 °.

Preferably, f/EPD < 3.3.

Through the optical power and the face type of each lens of rational distribution, can realize the characteristic of wide angle, effectively increase photographic lens's shooting scope to the rational distribution of optical power can reduce sensitivity, improves the image quality. At least one lens in the first lens to the sixth lens is a glass lens, so that the temperature drift can be effectively controlled, the photographic lens can adapt to high and low temperature environments, and the imaging quality is improved. The obtained object information can be enlarged and the shooting range can be enlarged by reasonably restricting the maximum field angle FOV of the photographic lens. The characteristic of a large aperture of the photographic lens can be realized by restraining the ratio between the effective focal length f of the photographic lens and the entrance pupil diameter EPD of the photographic lens in a reasonable range, so that the high image quality can be ensured in a dark-light environment.

In the present embodiment, an on-axis distance SAG31 between an intersection point of the object side surface of the third lens and the optical axis and an effective radius vertex of the object side surface of the third lens and an on-axis distance SAG32 between an intersection point of the image side surface of the third lens and the optical axis and an effective radius vertex of the image side surface of the third lens satisfy: -2.0 < (SAG 31-SAG 32)/(SAG31+SAG32) < -1.0. By restricting the relational expression between the on-axis distance SAG31 between the intersection point of the object side surface of the third lens and the optical axis and the effective radius vertex of the object side surface of the third lens and the on-axis distance SAG32 between the intersection point of the image side surface of the third lens and the optical axis and the effective radius vertex of the image side surface of the third lens within a reasonable range, the processing characteristics of the third lens can be ensured. Preferably, -1.9 < (SAG 31-SAG 32)/(SAG31+SAG32) < -1.3.

The photographic lens may optionally further include a filter for correcting color deviation or a protective glass for protecting a photosensitive element located on the imaging surface.

The photographic lens in the present application may employ a plurality of lenses, for example, the six lenses described above. Through the optical power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like of the reasonable distribution, the aperture of the photographic lens can be effectively increased, the sensitivity of the lens is reduced, and the processability of the lens is improved, so that the photographic lens is more beneficial to production and processing and is applicable to portable electronic equipment such as smart phones and the like. The left side is the object side and the right side is the image side.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses making up a photographic lens can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although six lenses are described as an example in the embodiment, the photographing lens is not limited to include six lenses. The photographic lens may also include other numbers of lenses, if desired.

Examples of specific surface types and parameters applicable to the photographing lens of the above embodiment are further described below with reference to the drawings.

Any of the following examples one to six is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 4, a photographic lens according to an example of the present application is described. Fig. 1 shows a schematic diagram of a photographic lens structure of example one.

As shown in fig. 1, the photographing lens sequentially includes, from an object side to an image side: the optical system comprises a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7 and an imaging surface S15.

The first lens E1 has negative focal power, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is convex, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex, and the image-side surface S12 of the sixth lens element is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the effective focal length f of the photographic lens is 2.07mm, the half of the maximum field angle Semi-FOV of the photographic lens is 61.5 °, the total length TTL of the photographic lens is 5.10mm and the image height ImgH is 3.03mm.

Table 1 shows a basic structural parameter table of a photographic lens of example one, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 1

In the first example, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspheric, and the surface shape of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 that can be used for each of the aspherical mirrors S1-S12 in example one.

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve of the photographing lens of example one, which indicates the convergence focus deviation of light rays of different wavelengths after passing through the photographing lens. Fig. 3 shows an astigmatism curve of the photographing lens of example one, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4 shows a magnification chromatic aberration curve of the photographing lens of example one, which represents the deviation of different image heights on the imaging plane after the light passes through the photographing lens.

As can be seen from fig. 2 to fig. 4, the photographing lens provided in example one can achieve good imaging quality.

Example two

As shown in fig. 5 to 8, a photographing lens of example two of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 5 shows a schematic diagram of a photographic lens structure of example two.

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

In this example, the effective focal length f of the photographing lens is 1.91mm, the half of the maximum field angle Semi-FOV of the photographing lens is 61.4 °, the total length TTL of the photographing lens is 5.20mm and the image height ImgH is 3.09mm.

Table 3 shows a basic structural parameter table of a photographic lens of example two, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 3 Table 3

Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example two, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.3124E-01

-8.2836E-02

1.7448E-02

-4.7424E-03

1.3856E-03

-3.6909E-04

6.7245E-05

0.0000E+00

S2

3.3608E-01

-5.0667E-02

4.5524E-04

-1.4715E-03

7.3346E-04

1.5185E-04

4.6469E-05

0.0000E+00

S3

1.9105E-02

-8.5336E-03

-1.0715E-03

-3.6293E-04

1.6024E-04

5.6848E-05

2.3396E-05

0.0000E+00

S4

2.1363E-02

-7.3760E-05

-1.3226E-04

-5.1112E-05

1.9953E-05

1.7040E-06

2.8736E-06

0.0000E+00

S5

2.4834E-03

-9.2070E-04

-2.2049E-04

-4.9656E-05

-1.2211E-05

-3.8656E-06

-1.3039E-06

-4.1163E-07

1.0117E-06

S6

-1.0080E-01

-1.0715E-02

-1.3727E-03

-5.6573E-05

-1.4385E-04

-2.9935E-05

1.2464E-05

-2.6805E-05

5.4145E-06

S7

-1.8066E-01

-1.3518E-03

-3.9137E-03

1.4306E-03

-2.2318E-04

1.4196E-04

2.3425E-05

2.9128E-05

-1.0894E-05

S8

-1.6093E-01

2.4767E-02

-4.6600E-03

2.5519E-03

-5.2481E-04

1.2313E-04

4.5023E-05

-6.7785E-06

-5.3668E-06

S9

-6.4988E-02

1.5157E-02

-1.0374E-02

1.5664E-03

-6.3780E-04

1.2186E-04

1.5929E-04

-3.9417E-05

1.8547E-05

S10

5.3056E-01

1.2420E-01

-2.6061E-02

3.2971E-03

-6.1746E-04

2.5628E-03

-1.0217E-03

6.0661E-04

-2.9701E-04

S11

-1.0212E+00

2.1086E-01

1.7445E-03

3.0577E-04

-9.0651E-03

-1.2936E-03

1.7953E-03

1.0516E-03

-8.2950E-04

S12

-1.6074E+00

2.2398E-01

-8.1497E-02

3.6109E-02

-8.4041E-03

3.6673E-03

-1.7608E-03

2.1229E-04

-1.0424E-03

TABLE 4 Table 4

Fig. 6 shows an on-axis chromatic aberration curve of a photographing lens of example two, which indicates the convergence focus deviation of light rays of different wavelengths after passing through the photographing lens. Fig. 7 shows an astigmatism curve of the photographing lens of example two, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8 shows a magnification chromatic aberration curve of the photographing lens of example two, which represents the deviation of different image heights on the imaging plane after the light passes through the photographing lens.

As can be seen from fig. 6 to 8, the photographing lens assembly of the second example can achieve good imaging quality.

Example three

As shown in fig. 9 to 12, a photographic lens of example three of the present application is described. Fig. 9 shows a schematic diagram of a photographic lens structure of example three.

As shown in fig. 9, the photographing lens includes, in order from an object side to an image side: the optical system comprises a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7 and an imaging surface S15.

In this example, the effective focal length f of the photographic lens is 2.07mm, the half of the maximum field angle Semi-FOV of the photographic lens is 59.1 °, the total length TTL of the photographic lens is 5.00mm and the image height ImgH is 3.03mm.

Table 5 shows a basic structural parameter table of a photographic lens of example three, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 5

Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example three, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.1040E-01

-8.9885E-02

1.4882E-02

-4.9472E-03

1.4928E-03

-3.0167E-04

1.9718E-04

0.0000E+00

S2

3.5130E-01

-7.3273E-02

6.8103E-03

1.7174E-03

7.1959E-04

-7.6184E-04

-2.6235E-04

0.0000E+00

S3

1.7644E-02

-4.3924E-03

7.2842E-03

2.4855E-03

3.4297E-04

-2.5890E-04

-8.1792E-05

0.0000E+00

S4

3.7202E-02

7.4143E-03

2.5892E-03

7.9843E-04

1.5670E-04

1.1883E-05

-4.4245E-06

0.0000E+00

S5

3.1591E-03

-1.3183E-03

-4.6793E-05

9.7558E-05

7.1628E-05

3.9606E-05

1.8592E-05

6.5476E-06

1.3622E-06

S6

-1.0333E-01

-1.1713E-03

9.0188E-04

1.7529E-04

-5.8499E-05

1.8142E-05

2.5305E-05

3.0692E-06

5.7427E-06

S7

-1.8724E-01

1.7119E-02

3.1530E-03

1.0654E-03

-5.6916E-04

-1.4408E-05

-6.5392E-05

8.9630E-06

-4.4100E-05

S8

-1.3675E-01

3.3166E-02

-2.8671E-04

1.9596E-03

-3.0913E-04

6.5258E-05

-6.3077E-05

1.7928E-05

-2.8056E-05

S9

-3.6480E-02

8.4407E-03

-5.9940E-03

2.2382E-04

-2.2969E-04

-1.7161E-04

3.9251E-06

2.5516E-06

-4.7823E-06

S10

2.3857E-01

1.1941E-01

-1.8628E-02

1.6497E-03

-1.7297E-03

1.3202E-03

-3.5019E-04

2.2631E-04

1.1557E-05

S11

-1.8519E+00

3.0665E-01

-2.9704E-02

2.5027E-02

-1.7433E-02

-7.1918E-04

1.2651E-03

3.1504E-03

4.5191E-04

S12

-3.4506E+00

5.2745E-01

-1.7049E-01

6.9915E-02

-2.2287E-02

1.0376E-02

-3.9909E-03

2.4339E-03

-1.1211E-03

TABLE 6

Fig. 10 shows an on-axis chromatic aberration curve of the photographing lens of example three, which indicates the convergence focus deviation of light rays of different wavelengths after passing through the photographing lens. Fig. 11 shows an astigmatism curve of the photographing lens of example three, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12 shows a magnification chromatic aberration curve of the photographing lens of example three, which represents the deviation of different image heights on the imaging plane after light passes through the photographing lens.

As can be seen from fig. 10 to 12, the photographic lens given in example three can achieve good imaging quality.

Example four

As shown in fig. 13 to 16, a photographic lens of example four of the present application is described. Fig. 13 shows a schematic diagram of a photographic lens structure of example four.

As shown in fig. 13, the photographing lens includes, in order from an object side to an image side: the optical system comprises a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7 and an imaging surface S15.

In this example, the effective focal length f of the photographing lens is 1.97mm, the half of the maximum field angle Semi-FOV of the photographing lens is 62.9 °, the total length TTL of the photographing lens is 5.09mm and the image height ImgH is 3.03mm.

Table 7 shows a basic structural parameter table of a photographic lens of example four in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 7

Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example four, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

TABLE 8

Fig. 14 shows an on-axis chromatic aberration curve of the photographing lens of example four, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the photographing lens. Fig. 15 shows an astigmatism curve of the photographing lens of example four, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 16 shows a magnification chromatic aberration curve of the photographing lens of example four, which represents the deviation of different image heights on the imaging plane after light passes through the photographing lens.

As can be seen from fig. 14 to 16, the photographing lens assembly of example four can achieve good imaging quality.

Example five

As shown in fig. 17 to 20, a photographic lens of example five of the present application is described. Fig. 17 shows a schematic diagram of a photographic lens structure of example five.

As shown in fig. 17, the photographing lens includes, in order from an object side to an image side: the optical system comprises a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7 and an imaging surface S15.

In this example, the effective focal length f of the photographic lens is 2.16mm, the half of the maximum field angle Semi-FOV of the photographic lens is 60.8 °, the total length TTL of the photographic lens is 5.10mm and the image height ImgH is 3.03mm.

Table 9 shows a basic structural parameter table of a photographic lens of example five, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 9

Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example five, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.0242E-01

-9.0430E-02

1.5741E-02

-4.4180E-03

1.3923E-03

-2.1166E-04

2.1262E-04

0.0000E+00

S2

3.5299E-01

-7.3112E-02

5.2409E-03

1.7044E-03

1.4411E-03

-1.0947E-04

-2.4392E-05

0.0000E+00

S3

1.5144E-02

-3.8848E-03

6.8778E-03

2.2254E-03

2.5090E-04

-2.5084E-04

-4.4000E-05

0.0000E+00

S4

3.8479E-02

7.4600E-03

2.6062E-03

8.3834E-04

1.7961E-04

2.4697E-05

1.4913E-06

0.0000E+00

S5

3.4147E-03

-1.5386E-03

-5.1311E-05

9.4114E-05

6.8152E-05

4.4609E-05

2.7227E-05

1.1130E-05

3.0989E-06

S6

-1.0398E-01

-1.5720E-03

8.1341E-04

5.3711E-04

-1.9271E-05

3.8322E-05

-5.2413E-05

-2.4179E-05

-1.9429E-05

S7

-1.8763E-01

1.5705E-02

3.7119E-03

1.3759E-03

-5.1140E-04

-9.0995E-05

-6.0691E-05

-2.8073E-06

-4.8501E-06

S8

-1.3804E-01

3.2357E-02

-1.1912E-03

1.9031E-03

-3.9970E-04

5.2827E-05

2.1723E-06

-7.7520E-06

1.0134E-05

S9

-3.6402E-02

8.4019E-03

-6.0009E-03

3.3559E-04

-2.5818E-04

-1.6664E-04

7.4121E-05

-4.2276E-05

7.1003E-06

S10

1.8473E-01

1.0572E-01

-2.1391E-02

1.3394E-04

-2.2904E-03

9.2445E-04

-2.7808E-04

2.5594E-04

-3.6781E-05

S11

-1.9018E+00

3.4186E-01

-4.2728E-02

2.2334E-02

-1.6372E-02

1.3762E-04

1.9260E-03

2.5554E-03

1.5868E-04

S12

-3.9059E+00

6.5429E-01

-2.2555E-01

9.2353E-02

-3.1424E-02

1.4492E-02

-6.0923E-03

2.6728E-03

-1.9397E-03

Table 10

Fig. 18 shows an on-axis chromatic aberration curve of the photographing lens of example five, which indicates the convergence focus deviation of light rays of different wavelengths after passing through the photographing lens. Fig. 19 shows an astigmatism curve of the photographing lens of example five, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 20 shows a magnification chromatic aberration curve of the photographing lens of example five, which represents the deviation of different image heights on the imaging plane after light passes through the photographing lens.

As can be seen from fig. 18 to 20, the photographic lens provided in example five can achieve good imaging quality.

Example six

As shown in fig. 21 to 24, a photographic lens of example six of the present application is described. Fig. 21 shows a schematic diagram of a photographic lens structure of example six.

As shown in fig. 21, the photographing lens includes, in order from an object side to an image side: the optical system comprises a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7 and an imaging surface S15.

In this example, the effective focal length f of the photographic lens is 2.23mm, the half of the maximum field angle Semi-FOV of the photographic lens is 59.4 °, the total length TTL of the photographic lens is 5.00mm and the image height ImgH is 3.03mm.

Table 11 shows a basic structural parameter table of a photographic lens of example six, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 11

Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example six, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.9728E-01

-9.4200E-02

1.3390E-02

-4.2897E-03

2.2578E-03

3.2713E-04

4.3007E-04

0.0000E+00

S2

3.4108E-01

-7.9326E-02

9.3979E-03

4.3087E-03

2.5738E-03

2.6344E-04

1.2012E-04

0.0000E+00

S3

5.8576E-03

-3.1869E-03

7.5192E-03

1.3727E-03

-1.4074E-04

-2.5877E-04

-4.1821E-06

0.0000E+00

S4

3.6611E-02

8.4222E-03

2.7346E-03

6.3141E-04

2.5571E-05

-3.7017E-05

-1.1046E-05

0.0000E+00

S5

1.9373E-03

-9.9569E-04

1.5949E-04

-7.6239E-05

-5.4384E-05

1.2330E-04

1.7903E-04

1.0252E-04

2.6701E-05

S6

-1.0376E-01

-8.2448E-03

-6.2899E-04

6.6259E-04

5.0194E-04

4.0828E-04

1.2407E-04

3.1974E-05

-7.2371E-06

S7

-1.9135E-01

1.1986E-02

5.0048E-03

2.4449E-03

-5.1811E-04

-3.7538E-04

-3.5812E-04

-1.3575E-04

-4.8666E-05

S8

-1.4845E-01

3.0836E-02

-1.3222E-03

1.8508E-03

-8.1255E-04

5.4176E-05

-1.5554E-04

-4.0749E-05

-3.8480E-05

S9

-4.2879E-02

9.5475E-03

-5.6428E-03

5.1539E-04

-3.5355E-04

-1.6711E-05

3.6137E-05

-2.5684E-05

-4.0032E-06

S10

1.8473E-01

1.0572E-01

-2.1391E-02

1.3394E-04

-2.2904E-03

9.2445E-04

-2.7808E-04

2.5594E-04

-3.6781E-05

S11

-1.9018E+00

3.4186E-01

-4.2728E-02

2.2334E-02

-1.6372E-02

1.3762E-04

1.9260E-03

2.5554E-03

1.5868E-04

S12

-3.9059E+00

6.5429E-01

-2.2555E-01

9.2353E-02

-3.1424E-02

1.4492E-02

-6.0923E-03

2.6728E-03

-1.9397E-03

Table 12

Fig. 22 shows an on-axis chromatic aberration curve of the photographic lens of example six, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the photographic lens. Fig. 23 shows an astigmatism curve of the photographing lens of example six, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 24 shows a magnification chromatic aberration curve of the photographing lens of example six, which represents the deviation of different image heights on the imaging plane after light passes through the photographing lens.

As can be seen from fig. 22 to 24, the photographic lens given in example six can achieve good imaging quality.

In summary, examples one to six satisfy the relationships shown in table 13, respectively.

TABLE 13

Table 14 shows the effective focal lengths f of the photographing lenses of examples one to six, the effective focal lengths f1 to f6 of the respective lenses, and the like.

Parameters/examples	1	2	3	4	5	6
							f(mm)	2.07	1.91	2.07	1.97	2.16	2.23
f1(mm)	-3.27	-2.98	-3.27	-3.18	-3.25	-3.42
							f2(mm)	7.22	4.75	6.45	6.39	6.76	6.47
f3(mm)	2.58	2.65	2.66	2.64	2.48	2.50
							f4(mm)	-4.37	-2.72	-4.75	-4.90	-4.20	-3.77
f5(mm)	2.18	1.94	2.40	2.52	2.48	2.47
							f6(mm)	-6.03	-10.68	-8.83	-11.47	-7.17	-7.53
TTL(mm)	5.10	5.20	5.00	5.09	5.10	5.00
							ImgH(mm)	3.03	3.09	3.03	3.03	3.03	3.03
Semi-FOV(°)	61.5	61.4	59.1	62.9	60.8	59.4

TABLE 14

The application also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the photographic lens described above.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A photographic lens, comprising, in order from an object side to an image side along an optical axis:

A first lens having negative optical power, the object side of the first lens being concave;

a second lens having positive optical power, the image side of the second lens being concave;

a third lens having positive optical power;

A fourth lens with negative focal power, wherein the object side surface of the fourth lens is a concave surface;

a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface;

A sixth lens having negative optical power;

Wherein at least one of the first lens to the sixth lens is a glass lens; an on-axis distance SAG31 between an intersection point of the object side surface of the third lens and the optical axis and an effective radius vertex of the object side surface of the third lens and an on-axis distance SAG32 between an intersection point of the image side surface of the third lens and the optical axis and an effective radius vertex of the image side surface of the third lens satisfy: -2.0 < (SAG 31-SAG 32)/(SAG31+SAG32) < -1.0; the maximum field angle FOV of the photographic lens satisfies: FOV >110 °; an on-axis distance TTL from an object side surface of the first lens to an imaging surface and a half of a diagonal length ImgH of an effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.8; the effective focal length f6 of the sixth lens and the curvature radius R11 of the object side of the sixth lens satisfy:

-10.5 < f6/R11 < -3.5; the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy the following conditions: 4.0 < (R5-R6)/(R5+R6) < 11.0.

2. The photographic lens of claim 1, wherein an effective focal length f of the photographic lens and an entrance pupil diameter EPD of the photographic lens satisfy: f/EPD < 3.5.

3. The photographic lens of claim 1, wherein an effective focal length f2 of the second lens element and a radius of curvature R3 of an object side surface of the second lens element satisfy: 2.5 < f2/R3 < 4.5.

4. The photographic lens of claim 1, wherein an effective focal length f5 of the fifth lens element and a radius of curvature R9 of an object side surface of the fifth lens element satisfy: r9/f5 is more than 1.5 and less than 7.5.

5. The photographic lens of claim 1, wherein a center thickness CT6 of the sixth lens on the optical axis and an edge thickness ET6 of the sixth lens satisfy: ET6/CT6 is more than 1.0 and less than 2.0.

6. The photographic lens of claim 1, wherein an on-axis distance SAG52 between a center thickness CT5 of the fifth lens on the optical axis and an intersection point of the image side surface of the fifth lens and the optical axis to an effective radius vertex of the image side surface of the fifth lens satisfies: -2.0 < CT5/SAG52 < -1.5.

7. The photographic lens of claim 1, wherein a center thickness CT1 of the first lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy: CT3/CT1 is more than 1.5 and less than 2.5.

8. The photographic lens of claim 1, further comprising a diaphragm disposed between the second optic and the third optic.

9. A photographic lens, comprising, in order from an object side to an image side along an optical axis:

a third lens having positive optical power;

A sixth lens having negative optical power;

Wherein at least one of the first lens to the sixth lens is a glass lens; the maximum field angle FOV of the photographic lens satisfies: FOV >110 °; the effective focal length f of the photographic lens and the entrance pupil diameter EPD of the photographic lens satisfy: f/EPD < 3.5; an on-axis distance TTL from an object side surface of the first lens to an imaging surface and a half of a diagonal length ImgH of an effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.8; the effective focal length f6 of the sixth lens and the curvature radius R11 of the object side of the sixth lens satisfy: -10.5 < f6/R11 < -3.5; the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy the following conditions: 4.0 < (R5-R6)/(R5+R6) < 11.0.

10. The photographic lens of claim 9, wherein an effective focal length f2 of the second lens element and a radius of curvature R3 of an object side surface of the second lens element satisfy: 2.5 < f2/R3 < 4.5.

11. The photographic lens of claim 9, wherein an effective focal length f5 of the fifth lens element and a radius of curvature R9 of an object side surface of the fifth lens element satisfy: r9/f5 is more than 1.5 and less than 7.5.

12. The photographic lens of claim 9, wherein a center thickness CT6 of the sixth lens on the optical axis and an edge thickness ET6 of the sixth lens satisfy: ET6/CT6 is more than 1.0 and less than 2.0.

13. The photographic lens of claim 9, wherein an on-axis distance SAG52 between a center thickness CT5 of the fifth lens on the optical axis and an intersection point of the image side surface of the fifth lens and the optical axis to an effective radius vertex of the image side surface of the fifth lens satisfies: -2.0 < CT5/SAG52 < -1.5.

14. The photographic lens of claim 9, wherein a center thickness CT1 of the first lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy: CT3/CT1 is more than 1.5 and less than 2.5.

15. The photographic lens of claim 9, further comprising a diaphragm disposed between the second optic and the third optic.