CN114047606A

CN114047606A - Photographic lens

Info

Publication number: CN114047606A
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: 2022-02-15
Anticipated expiration: 2041-12-02
Also published as: CN114047606B

Abstract

The invention provides a photographic lens. The photographic lens includes along optical axis from the object side to image side in proper order: the first lens with negative focal power, the object side surface of the first lens is a concave surface; the second lens with focal power, the image side surface of the second lens is a concave surface; a third lens having an 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 focal power, wherein the object side surface of the fifth lens is a convex surface; a sixth lens having an optical power; at least one of the first lens to the sixth lens is a glass lens; an 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 an 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 < (SAG31-SAG32)/(SAG31+ SAG32) < -1.0. The invention solves the problem that the photographic lens in the prior art has high image quality and high and low temperature adaptability and is difficult to simultaneously consider.

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 gradually mature, taking a photographic lens of a mobile phone as an example, a traditional mobile phone lens generally consists of a plurality of plastic lenses, so as to ensure the light weight and low cost of the mobile phone lens, but due to the problem of the material of the plastic lenses, the deformation condition easily occurs in a high-temperature or low-temperature environment, and due to the limitation of the material, the image quality is sacrificed, so that the final imaging effect is difficult to meet the requirements of users. Meanwhile, users also put higher requirements on the size of the photographic lens, the ultrathin camera lens is more popular with users due to the large shooting range and the large aperture, and meanwhile, the lens can be stably matched with a photosensitive element of a mobile phone.

That is, the conventional imaging lens has a problem that it is difficult to achieve both high image quality and high/low temperature adaptability.

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 high and low temperature adaptability and is difficult to simultaneously consider.

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 with negative focal power, the object side surface of the first lens is a concave surface; the second lens with focal power, the image side surface of the second lens is a concave surface; a third lens having an 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 focal power, wherein the object side surface of the fifth lens is a convex surface; a sixth lens having an optical power; wherein at least one of the first lens to the sixth lens is a glass lens; an 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 an 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 < (SAG31-SAG32)/(SAG31+ SAG32) < -1.0.

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

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 to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 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 curvature radius 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 radius of curvature R5 of the object-side surface of the third lens and the radius of curvature 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 curvature radius R11 of the object side surface 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: 1.0 < ET6/CT6 < 2.0.

Further, the on-axis distance SAG52 from the center thickness CT5 of the fifth lens on the optical axis to the intersection point 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 the following condition: 2.0 < CT5/SAG52 < -1.5.

Further, 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: 1.5 < CT3/CT1 < 2.5.

Further, the photographic lens also 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 comprising, in order from an object side to an image side along an optical axis: the first lens with negative focal power, the object side surface of the first lens is a concave surface; the second lens with focal power, the image side surface of the second lens is a concave surface; a third lens having an 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 focal power, wherein the object side surface of the fifth lens is a convex surface; a sixth lens having an 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 meet the following conditions: 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 to 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 to an effective radius vertex of the image-side surface of the third lens satisfy: -2.0 < (SAG31-SAG32)/(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 an object side to an image side along an 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; an 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 an 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 < (SAG31-SAG32)/(SAG31+ SAG32) < -1.0.

Through the focal power and the surface type of each lens which are reasonably distributed, the wide-angle characteristic can be realized, the shooting range of the photographic lens is effectively enlarged, the sensitivity can be reduced through the reasonable distribution of the focal power, and the image quality is improved. At least one lens is the glass lens in first lens to the sixth lens, sets up like this and can effectively control the temperature and float for photographic lens can adapt to high cryogenic environment, improves imaging quality simultaneously. The processing characteristics of the third lens can be ensured by constraining the relation between the on-axis distance SAG31 from the intersection point of the object side surface of the third lens and the optical axis to the effective radius vertex of the object side surface of the third lens and the on-axis distance SAG32 from the intersection point of the image side surface of the third lens and the optical axis to the effective radius vertex of the image side surface of the third lens to be within a reasonable range.

In addition, the photographic lens has the characteristics of wide angle, strong high and low temperature adaptability, large aperture and ultrathin thickness, and the wide angle is wider in shooting range compared with the common lens; due to the fact that the glass lens is added into the photographic lens, imaging quality can be improved, and the photographic lens can adapt to high and low temperature environments; the large aperture ensures that the image quality is better in a darker environment; the requirement of ultra-thinness is met, the overall size of the photographic lens is small, and the attractiveness is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view showing a configuration of a photographic lens according to a first example of the present invention;

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

fig. 5 is a schematic view showing a configuration of a photographic lens of example two of the present invention;

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

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

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

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

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

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

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

fig. 21 is a schematic view showing a configuration 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 chromatic aberration of magnification curve, respectively, of the photographing lens in fig. 21.

Wherein the figures include the following reference numerals:

e1, a first lens; s1, the object side surface of the first lens; s2, the 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, stop; e3, third lens; s5, the object side surface of the third lens; s6, the image side surface of the third lens; e4, fourth lens; s7, the object side surface of the fourth lens; s8, the image side surface of the fourth lens; e5, fifth lens; s9, the object side surface of the fifth lens; s10, the image side surface of the fifth lens; e6, sixth lens; s11, the object side surface of the sixth lens; s12, the image side surface of the sixth lens; e7, optical filters; s13, the object side surface of the optical filter; s14, the image side surface of the optical filter; and S15, imaging surface.

Detailed Description

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

It is noted that, unless otherwise indicated, 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.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, 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 the convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and 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, it means that 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 close to the object side becomes the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The determination of the surface shape in the paraxial region can be made by determining whether or not the surface shape is concave or convex using an R value (R denotes a radius of curvature of the paraxial region, and usually denotes an R value in a lens database (lens data) in optical software) according to a determination method by a person ordinarily skilled in the art. For 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 case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

The invention provides a photographic lens, aiming at solving the problem that the photographic lens in the prior art has high image quality and high and low temperature adaptability which are difficult to be considered simultaneously.

Example one

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 power, a second lens having power, a third lens having power, a fourth lens having negative power, a fifth lens having power, and a sixth lens having 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; an 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 an 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 < (SAG31-SAG32)/(SAG31+ SAG32) < -1.0.

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

In the present embodiment, the maximum field angle FOV of the photographing lens satisfies: FOV >110 deg. By reasonably restricting the maximum field angle FOV of the photographic lens, the obtained object information can be enlarged, and the shooting range is enlarged. Preferably, the FOV is >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. By restraining the ratio of the effective focal length f of the photographic lens to the entrance pupil diameter EPD of the photographic lens within a reasonable range, the characteristic of a large aperture of the photographic lens can be realized, and better image quality can be ensured in a dark 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 the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.8. The ratio of the on-axis distance TTL from the object side surface of the first lens to the imaging surface to the half of the diagonal length ImgH of the effective pixel area on the imaging surface is in a reasonable range, so that the miniaturization is favorably realized, the whole photographic lens is ensured to have smaller volume, and the appearance attractiveness of the photographic lens is improved. Preferably, TTL/ImgH < 1.7.

In the embodiment, 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. The method satisfies the conditional expression, and is beneficial to controlling the bending degree of the second lens, so that the second lens has better molding processing characteristics. Preferably, 2.6 < f2/R3 < 4.2.

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

In the present embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: 4.0 < (R5-R6)/(R5+ R6) < 11.0. Satisfying the conditional expression, the curvature and focal power of the third lens can be ensured, the forming processability of the third lens can be improved, and the aberration can be 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, the forming processability of the sixth lens is improved, and aberration is reduced. Preferably, -10.1 < f6/R11 < -3.9.

In the present embodiment, the central thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 of the sixth lens satisfy: 1.0 < ET6/CT6 < 2.0. Satisfying the conditional expression is beneficial to controlling the ratio of the central thickness CT6 of the sixth lens on the optical axis to the edge thickness ET6 of the sixth lens, so that the sixth lens has better molding processing characteristics. Preferably, 1.2 < ET6/CT6 < 1.5.

In the embodiment, the on-axis distance SAG52 from the center thickness CT5 of the fifth lens on the optical axis to the intersection point 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 the following condition: 2.0 < CT5/SAG52 < -1.5. The condition is satisfied, the center thickness of the fifth lens can be effectively ensured, 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: 1.5 < CT3/CT1 < 2.5. Satisfying this conditional expression, can rationally distribute the central thickness of first lens and third lens, reduce the aberration and improve the assembling nature. 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, enables the whole photographic lens to be 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 power, a second lens having power, a third lens having power, a fourth lens having negative power, a fifth lens having power, and a sixth lens having 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 photographic lens and the entrance pupil diameter EPD of the photographic lens meet the following conditions: f/EPD < 3.5.

Preferably, the FOV is >118 °.

Preferably, f/EPD < 3.3.

Through the focal power and the surface type of each lens which are reasonably distributed, the wide-angle characteristic can be realized, the shooting range of the photographic lens is effectively enlarged, the sensitivity can be reduced through the reasonable distribution of the focal power, and the image quality is improved. At least one lens is the glass lens in first lens to the sixth lens, sets up like this and can effectively control the temperature and float for photographic lens can adapt to high cryogenic environment, improves imaging quality simultaneously. By reasonably restricting the maximum field angle FOV of the photographic lens, the obtained object information can be enlarged, and the shooting range is enlarged. By restraining the ratio of the effective focal length f of the photographic lens to the entrance pupil diameter EPD of the photographic lens within a reasonable range, the characteristic of a large aperture of the photographic lens can be realized, and better image quality can be ensured in a dark environment.

In this embodiment, 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 < (SAG31-SAG32)/(SAG31+ SAG32) < -1.0. The processing characteristics of the third lens can be ensured by constraining the relation between the on-axis distance SAG31 from the intersection point of the object side surface of the third lens and the optical axis to the effective radius vertex of the object side surface of the third lens and the on-axis distance SAG32 from the intersection point of the image side surface of the third lens and the optical axis to the effective radius vertex of the image side surface of the third lens to be within a reasonable range. Preferably, -1.9 < (SAG31-SAG32)/(SAG31+ SAG32) < -1.3.

The above-mentioned photographic lens may further optionally include a filter for correcting color deviation or a protective glass for protecting a photosensitive element located on the image plane.

The photographic lens in the present application may employ a plurality of lenses, for example, the above-mentioned six lenses. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between the lenses and the like, the aperture of the photographic lens can be effectively increased, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the photographic lens is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. 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 aspheric lens has the characteristics 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 lens center to the lens periphery, an aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.

However, it will be understood by those skilled in the art that the number of lenses constituting the photographic lens may be varied to obtain the respective results and advantages described in the present specification without departing from the technical solutions claimed in the present application. For example, although six lenses are exemplified in the embodiment, the photographing lens is not limited to including six lenses. The photographic lens may also include other numbers of lenses, as desired.

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

It should be noted that any one 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 of the first 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 includes, in order from an object side to an image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

The first lens E1 has negative power, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is concave. The second lens E2 has positive power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The third lens E3 has positive power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The fourth lens E4 has negative power, and the object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is concave. The fifth lens E5 has positive power, the object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The sixth lens E6 has negative power, and the object-side surface S11 of the sixth lens is convex and the image-side surface S12 of the sixth lens is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The 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 photographing lens is 2.07mm, the Semi-FOV of the maximum field angle of the photographing lens is 61.5 °, the total length TTL of the photographing lens is 5.10mm, and the image height ImgH is 3.03 mm.

Table 1 shows a basic structural parameter table of the photographing lens of example one, in which the units of the radius of curvature, the thickness/distance, the focal length, and the 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 through the sixth lens E6 are aspheric surfaces, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 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 i-th order of the aspherical surface. Table 2 below gives the high-order coefficient 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 represents the deviation of the convergent focus of light rays of different wavelengths after passing through the photographing lens. Fig. 3 shows astigmatism curves of the photographing lens of the first example, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows a chromatic aberration of magnification curve of the photographing lens of the first example, which shows the deviation of different image heights on the image plane after the light passes through the photographing lens.

As can be seen from fig. 2 to 4, the photographing lens of the first example can achieve good imaging quality.

Example two

As shown in fig. 5 to 8, a photographic lens of example two of the present application is described. In this example and the following examples, descriptions of parts similar to 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 includes, in order from an object side to an image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

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

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

TABLE 3

Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

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

Fig. 6 shows an on-axis chromatic aberration curve of the photographing lens of example two, which indicates that light rays of different wavelengths are deviated from a convergent focus after passing through the photographing lens. Fig. 7 shows astigmatism curves of the photographing lens of the second example, which represent meridional field curvature and sagittal field curvature. Fig. 8 shows a chromatic aberration of magnification curve of the photographing lens of the second example, which shows the deviation of different image heights on the image plane after the light passes through the photographing lens.

As can be seen from fig. 6 to 8, the photographing lens according to example two can achieve good imaging quality.

Example III

As shown in fig. 9 to 12, a photographic lens of a third example 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: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

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

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

TABLE 5

Table 6 shows the high-order term coefficients that can be used for each aspherical mirror surface in example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

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 represents the deviation of the convergent focus of light rays of different wavelengths after passing through the photographing lens. Fig. 11 shows astigmatism curves of the photographing lens of example three, which represent meridional field curvature and sagittal field curvature. Fig. 12 shows a chromatic aberration of magnification curve of the photographing lens of example three, which represents the deviation of different image heights on the image plane after light passes through the photographing lens.

As can be seen from fig. 10 to 12, the photographing lens according to the third example can achieve good imaging quality.

Example four

As shown in fig. 13 to 16, a photographic lens of the present example four 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: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

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

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

TABLE 7

Table 8 shows the high-order term coefficients that can be used for each aspherical mirror surface in example four, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 8

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

As can be seen from fig. 14 to 16, the photographing lens according to 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, in order from an object side to an image side, 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, a filter E7 and an imaging surface S15.

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

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

TABLE 9

Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

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

Watch 10

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

As can be seen from fig. 18 to 20, the photographing lens according to 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: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

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

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

TABLE 11

Table 12 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

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 photographing lens of example six, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the photographing lens. Fig. 23 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the photographing lens of example six. Fig. 24 shows a chromatic aberration of magnification curve of the photographing lens of example six, which represents a deviation of different image heights on the image plane after light passes through the photographing lens.

As can be seen from fig. 22 to 24, the photographing lens according to example six can achieve good imaging quality.

To sum up, examples one to six satisfy the relationships shown in table 13, respectively.

Watch 13

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

Parameter/example	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 present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the photographing lens described above.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection 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 example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of 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 claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

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

a first lens having a negative optical power, an object side surface of the first lens being a concave surface;

the second lens with focal power, the image side surface of the second lens is a concave surface;

a third lens having an optical power;

a fourth lens having a negative optical power, an object side surface of the fourth lens being a concave surface;

a fifth lens having a focal power, an object side surface of the fifth lens being a convex surface;

a sixth lens having an 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 an 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 an 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 < (SAG31-SAG32)/(SAG31+ SAG32) < -1.0.

2. The photographic lens of claim 1, wherein a maximum field angle FOV of the photographic lens satisfies: FOV >110 deg.

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

4. The photographing lens of claim 1, wherein an on-axis distance TTL from an object side surface of the first lens element to an imaging surface satisfies, with ImgH, half a diagonal length of an effective pixel area on the imaging surface: TTL/ImgH is less than 1.8.

5. The photographing lens according to claim 1, wherein an effective focal length f2 of the second lens and a radius of curvature R3 of an object side of the second lens satisfy: 2.5 < f2/R3 < 4.5.

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

7. The photographing lens according to claim 1, wherein a radius of curvature R5 of an object side surface of the third lens and a radius of curvature R6 of an image side surface of the third lens satisfy: 4.0 < (R5-R6)/(R5+ R6) < 11.0.

8. The photographing lens according to claim 1, wherein an effective focal length f6 of the sixth lens and a radius of curvature R11 of an object side of the sixth lens satisfy: -10.5 < f6/R11 < -3.5.

9. Photographic lens according to claim 1, characterized in that the sixth lens has a central thickness CT6 on the optical axis and an edge thickness ET6 satisfying: 1.0 < ET6/CT6 < 2.0.

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

a third lens having an optical power;

a sixth lens having an 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.