CN215986691U

CN215986691U - Image capturing system

Info

Publication number: CN215986691U
Application number: CN202122283891.4U
Authority: CN
Inventors: 俞力奇; 孟祥月; 宋立通; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-03-08
Anticipated expiration: 2031-09-18

Abstract

The utility model discloses an image capturing system, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens having an optical power; the image side of the second lens is a concave surface; a third lens having positive refractive power, an object side of which is a convex surface; a fourth lens with positive refractive power, wherein the object side of the fourth lens is a convex surface, and the image side of the fourth lens is a convex surface; a fifth lens having a negative optical power; wherein the central thickness CT4 of the fourth lens and the effective focal length f of the image capturing system satisfy: 0.5< CT4/f < 0.9. When the focal power and the surface type conditions are met, the reasonable distribution of the focal power of the image capturing system is facilitated, and the image capturing system is easy to balance and correct various aberrations; when the requirements for the central thickness and the effective focal length of the lens are met, the volume proportion of the fourth lens in the optical system can be controlled, and the miniaturization of the size of the image capturing system is facilitated.

Description

Image capturing system

Technical Field

The utility model belongs to the field of optical imaging, and particularly relates to an image capturing system comprising five lenses.

Background

In recent years, an ultra-wide-angle image capturing system of each smart device becomes a new hotspot. The ultra-wide-angle imaging system can achieve the imaging effect which is nearly the fish eye. The general fisheye imaging system is difficult to miniaturize, which affects the thickness and weight of the intelligent device. The great pain point of above-mentioned fisheye lens volume is overcome to this patent objective. The fish eye imaging system has the characteristics of the fish eye imaging effect of the imaging system, and the small-size fish eye imaging system is provided. Which has a higher imaging quality and a smaller system volume. The small-size fisheye imaging system has a great application space.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an image capturing system with small volume, which has higher imaging quality and smaller system volume. The small-size fisheye imaging system has a great application space.

The present application provides an image capturing system, sequentially comprising, from an object side to an image side along an optical axis:

a first lens having an optical power;

a second lens having a negative optical power;

a third lens having positive refractive power, an object side of which is a convex surface;

a fourth lens with positive refractive power, wherein the object side of the fourth lens is a convex surface, and the image side of the fourth lens is a convex surface;

a fifth lens having a negative optical power;

wherein the central thickness CT4 of the fourth lens and the effective focal length f of the image capturing system satisfy: 0.5< CT4/f < 0.9.

According to one embodiment of the present application, a half Semi-FOV of the maximum field angle of the image capture system satisfies: tan (Semi-FOV) > 3.7.

According to one embodiment of the present application, the abbe number Vd2 of the second lens, the abbe number Vd3 of the third lens and the abbe number Vd4 of the fourth lens satisfy: (Vd2-Vd3+ Vd4)/3< 31.

According to one embodiment of the present application, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the effective focal length f of the image capturing system satisfy: 2< (f3+ f4)/f < 4.

According to one embodiment of the present application, the maximum radius SD of the aperture stop and the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfy: SD/ImgH < 0.25.

According to one embodiment of the present application, the effective focal length f of the image capturing system and the entrance pupil diameter EPD of the image capturing system satisfy: 2.1< f/EPD < 2.4.

According to one embodiment of the present application, a distance TTL on an optical axis from an object-side surface of the first lens to an image surface of the image capturing system, a central thickness CT3 of the third lens, a central thickness CT4 of the fourth lens, and a distance T34 on the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens satisfy: 2.3< TTL/(CT3+ T34+ CT4) < 3.3.

According to one embodiment of the present application, a distance TD on the optical axis from the object-side surface of the first lens to the image-side surface of the fifth lens and a half ImgH of a diagonal length of the effective pixel area on the imaging plane satisfy: 2.0< TD/ImgH < 2.3.

According to one embodiment of the present application, the entrance pupil diameter EPD of the image capturing system, the half ImgH of the diagonal length of the effective pixel area on the imaging plane, and the effective half aperture DT52 of the image side surface of the fifth lens satisfy: 0.15< EPD/(ImgH + DT52) < 0.3.

According to one embodiment of the present application, a radius of curvature R7 of the object-side surface of the fourth lens and a radius of curvature R8 of the image-side surface of the fourth lens satisfy: 0.6< (R7+ R8)/(R7-R8) < 0.8.

The present application further provides an image capturing system, sequentially comprising, from an object side to an image side along an optical axis:

a first lens having an optical power;

a second lens having a negative optical power;

a fifth lens having a negative optical power;

wherein, effective focal length f of the image capturing system and entrance pupil diameter EPD of the image capturing system satisfy: 2.1< f/EPD < 2.4.

According to an embodiment of the present application, the fourth lens center thickness CT4 and the effective focal length f of the image capturing system satisfy: 0.5< CT4/f < 0.9.

The utility model has the beneficial effects that:

the image capturing system provided by the utility model comprises a plurality of lenses, such as a first lens, a second lens, a third lens and a fourth lens. When the focal power and the surface type conditions are met, the reasonable distribution of the focal power of the image capturing system is facilitated, and the image capturing system is easy to balance and correct various aberrations; when the requirements for the central thickness and the effective focal length of the lens are met, the volume proportion of the fourth lens in the optical system can be controlled, and the miniaturization of the size of the image capturing system is facilitated.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a lens assembly of an image capturing system according to an embodiment 1 of the present invention;

fig. 2a to fig. 2c are a distortion curve, an axial chromatic aberration curve and an astigmatism curve of an image capturing system in embodiment 1 of the present invention, respectively;

FIG. 3 is a schematic diagram of a lens assembly of an image capturing system according to embodiment 2 of the present invention;

fig. 4a to 4c are a distortion curve, an axial chromatic aberration curve and an astigmatism curve of an image capturing system in embodiment 2 of the present invention, respectively;

FIG. 5 is a schematic diagram of a lens assembly of an image capturing system according to embodiment 3 of the present invention;

fig. 6a to 6c are a distortion curve, an axial chromatic aberration curve and an astigmatism curve of an image capturing system in embodiment 3 of the present invention, respectively;

FIG. 7 is a schematic diagram of a lens assembly of an image capturing system according to embodiment 4 of the present invention;

fig. 8a to 8c are a distortion curve, an axial chromatic aberration curve and an astigmatism curve of an image capturing system in embodiment 4 of the present invention, respectively;

FIG. 9 is a schematic diagram of a lens assembly of an image capturing system according to embodiment 5 of the present invention;

fig. 10a to 10c are a distortion curve, an axial chromatic aberration curve and an astigmatism curve of an image capturing system in accordance with an embodiment 5 of the present invention;

FIG. 11 is a schematic view of a lens assembly of an image capturing system according to embodiment 6 of the present invention;

fig. 12a to 12c are a distortion curve, an axial chromatic aberration curve and an astigmatism curve of an image capturing system in embodiment 6 of the utility model.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present 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, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present invention.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for 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.

In the description of the present invention, 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 closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

Unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. Features, principles and other aspects of the present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Exemplary embodiments

The image capturing system of the exemplary embodiment of the present invention includes five lenses, in order from an object side to an image side along an optical axis: the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the lenses are independent from each other, and an air space is formed between the lenses on an optical axis.

In this exemplary embodiment, an image capturing system, in order from an object side to an image side along an optical axis, includes: a first lens having an optical power; a second lens having a negative optical power; a third lens having positive refractive power, an object side of which is a convex surface; a fourth lens with positive refractive power, wherein the object side of the fourth lens is a convex surface, and the image side of the fourth lens is a convex surface; a fifth lens having a negative optical power; when the focal power and the surface type conditions are met, the reasonable distribution of the focal power of the image capturing system is facilitated, and the image capturing system is easy to balance and correct various aberrations.

In the exemplary embodiment, the fourth lens center thickness CT4 and the effective focal length f of the image capturing system satisfy: 0.5< CT4/f < 0.9. When the requirements for the central thickness and the effective focal length of the lens are met, the volume proportion of the fourth lens in the optical system can be controlled, and the miniaturization of the size of the image capturing system is facilitated. More specifically, in the present exemplary embodiment, the fourth lens center thickness CT4 and the effective focal length f of the image capturing system satisfy: 0.5< CT4/f < 0.87.

In the present exemplary embodiment, half of the maximum field angle Semi-FOV of the image capture system satisfies: tan (Semi-FOV) > 3.7. When the condition of the viewing angle is met, the optical performance of the image capturing system with a large viewing angle is favorably realized, so that the imaging effect of the fisheye is obtained. More specifically, half of the Semi-FOV of the maximum field angle of the image capture system satisfies: tan (Semi-FOV) > 3.72.

In the present exemplary embodiment, the abbe number Vd2 of the second lens, the abbe number Vd3 of the third lens, and the abbe number Vd4 of the fourth lens satisfy: (Vd2-Vd3+ Vd4)/3< 31. When the condition of the dispersion coefficient of each lens is satisfied, the optical path difference of the polychromatic light in each lens is reasonably distributed, and the correction of the vertical axis chromatic aberration of the image capturing system is facilitated. More specifically, the abbe number Vd2 of the second lens, the abbe number Vd3 of the third lens and the abbe number Vd4 of the fourth lens satisfy: (Vd2-Vd3+ Vd4)/3< 30.7.

In the present exemplary embodiment, the effective focal length f2 of the second lens, the effective focal length f5 of the fifth lens, and the effective focal length f of the image taking system satisfy: -8< (f2+ f5)/f < -1.5. When the above-mentioned effective focal length condition is satisfied, the effective focal length of second lens and fifth lens has been restricted, is favorable to reducing the volume of second lens and fifth lens, realizes getting for instance the system volume miniaturization. More specifically, the effective focal length f2 of the second lens, the effective focal length f5 of the fifth lens, and the effective focal length f of the image capturing system satisfy: -7.2< (f2+ f5)/f < -1.94.

In the present exemplary embodiment, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the effective focal length f of the image taking system satisfy: 2< (f3+ f4)/f < 4. When the above-mentioned effective focal length condition is satisfied, the effective focal length of third lens and fourth lens has been restricted, is favorable to reducing the volume of third lens and fourth lens, realizes getting for instance the system volume miniaturization. More specifically, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the effective focal length f of the image capturing system satisfy: 2.45< (f3+ f4)/f < 3.82.

In the present exemplary embodiment, the maximum radius SD of the aperture stop and the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfy: SD/ImgH < 0.25. When the conditions are met, the aperture of the diaphragm is controlled, and ghost risks are reduced. More specifically, the maximum radius SD of the aperture stop and the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfy: SD/ImgH is less than or equal to 0.24.

In the present exemplary embodiment, the effective focal length f of the image capturing system and the entrance pupil diameter EPD of the image capturing system satisfy: 2.1< f/EPD < 2.4. When the conditions are met, the caliber of the image capturing system is limited, and the miniaturization of the caliber of the image capturing system is facilitated. More specifically, the effective focal length f of the image capturing system and the entrance pupil diameter EPD of the image capturing system satisfy: 2.15< f/EPD < 2.38.

In the present exemplary embodiment, the distance TTL on the optical axis from the object-side surface of the first lens to the image plane, the center thickness CT3 of the third lens, the center thickness CT4 of the fourth lens, and the distance T34 on the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens of the image taking system satisfy: 2.3< TTL/(CT3+ T34+ CT4) < 3.3. When the conditions are met, the central thicknesses of the third lens and the fourth lens are reasonably distributed, the axial aberration of the image capturing system is favorably corrected, and meanwhile, the processing and production requirements are also met. More specifically, the distance TTL on the optical axis from the object-side surface of the first lens to the image plane, the central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens, and the distance T34 on the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens of the image capturing system satisfy: 2.33< TTL/(CT3+ T34+ CT4) < 3.3.

In the present exemplary embodiment, the distance TD on the optical axis from the object-side surface of the first lens to the image-side surface of the fifth lens and the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfy: 2.05< TD/ImgH < 2.25.

In the present exemplary embodiment, the entrance pupil diameter EPD of the image taking system, half ImgH of the diagonal length of the effective pixel area on the imaging plane, and the effective half aperture DT52 of the image side surface of the fifth lens satisfy: 0.15< EPD/(ImgH + DT52) < 0.3. When the conditions are met, the optical total length of the image capturing system is limited, and the miniaturization of the total length of the image capturing system is facilitated. More specifically, the entrance pupil diameter EPD of the image capturing system, the half ImgH of the diagonal length of the effective pixel region on the imaging plane, and the effective half aperture DT52 of the image side surface of the fifth lens satisfy: 0.17< EPD/(ImgH + DT52) < 0.29.

In the present exemplary embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: 0.6< (R7+ R8)/(R7-R8) < 0.8. When the conditions are met, the shapes of the object side surface and the image side surface of the fourth lens are limited, and the monochromatic aberration of the image capturing system is balanced. More specifically, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: 0.61< (R7+ R8)/(R7-R8) < 0.78.

In the present exemplary embodiment, the object-side surface and the image-side surface of any one of the first lens E1 through the fifth lens E5 are aspheric, and the profile x of each aspheric lens can be defined using, but not limited to, the following aspheric 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); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface.

In the present exemplary embodiment, the image capturing system may further include a diaphragm. The diaphragm may be disposed at an appropriate position as needed, for example, the diaphragm may be disposed between the third lens and the fourth lens. Optionally, the image capturing system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the image forming surface.

The image capturing system according to the above embodiment of the present invention may employ a plurality of lenses, such as the above five lenses. The focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like are reasonably distributed, so that the image capturing system has a larger imaging image surface, has the characteristics of wide imaging range and high imaging quality, and ensures the miniaturization of the volume of the image capturing system.

In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspheric mirror surface. The aspheric lens is characterized in that: the aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and astigmatic aberration, unlike a spherical lens having a constant curvature from the lens center to the lens periphery, in which the curvature is continuously varied from the lens center to the lens periphery. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is an aspheric mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens and the fifth lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.

However, it will be understood by those skilled in the art that the number of lenses constituting the image capturing system 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 five lenses are exemplified in the embodiment, the image capturing system is not limited to include five lenses, and the image capturing system may include other numbers of lenses if necessary.

Specific embodiments of an image capturing system suitable for use in the above embodiments are further described below with reference to the drawings.

Detailed description of the preferred embodiment 1

Fig. 1 is a schematic view of a lens assembly in an image capturing system according to embodiment 1 of the present invention, the image capturing system sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. Filter E8 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane S13.

As shown in table 1, the basic parameter table of the image capturing system of embodiment 1 is shown, wherein the unit of the curvature radius, the thickness, and the focal length are all millimeters (mm).

TABLE 1

As shown in table 2, in embodiment 1, the total effective focal length f of the image taking system is 0.83mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the image taking system image forming surface S13 is 3.20mm, and the half ImgH of the diagonal length of the effective pixel region on the image forming surface S13 is 1.18 mm.

Half of the maximum field angle Semi-FOV of the optical imaging lens is 75.0 °.

TABLE 2

The image capturing system in embodiment 1 satisfies:

CT 4/f-0.86; wherein, CT4 is the central thickness of the fourth lens element, and f is the effective focal length of the image capturing system.

tan (Semi-FOV) ═ 3.73; wherein, the Semi-FOV is half of the maximum field angle of the image capturing system.

(Vd2-Vd3+ Vd4)/3 ═ 30.60; vd2, Vd3, and Vd4 are abbe numbers of the second lens, the third lens, and the fourth lens, respectively.

(f2+ f 5)/f-7.10; wherein f2 and f5 are the effective focal lengths of the second lens element and the fifth lens element, respectively, and f is the effective focal length of the image capturing system.

(f3+ f4)/f is 3.81; wherein f3 and f4 are the effective focal lengths of the third lens element and the fourth lens element, respectively, and f is the effective focal length of the image capturing system.

SD/ImgH is 0.17; wherein SD is the maximum radius of the aperture diaphragm, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

f/EPD is 2.20; wherein f is the effective focal length of the image capturing system, and EPD is the entrance pupil diameter of the image capturing system.

TTL/(CT3+ T34+ CT4) ═ 2.35; wherein, TTL is the distance on the optical axis from the object-side surface of the first lens element to the image plane of the image capturing system, CT3 and CT4 are the central thicknesses of the third lens element and the fourth lens element, respectively, and T34 is the distance on the optical axis from the image-side surface of the third lens element to the object-side surface of the fourth lens element.

TD/ImgH is 2.14; and TD is the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

EPD/(ImgH + DT52) ═ 0.19; the EPD is the entrance pupil diameter of the image capturing system, ImgH is half of the diagonal length of the effective pixel area on the image plane, and DT52 is the effective half aperture of the image side surface of the fifth lens element.

(R7+ R8)/(R7-R8) ═ 0.75; wherein R7 and R8 are radii of curvature of the object-side surface and the image-side surface of the fourth lens, respectively.

In example 1, the object-side surface and the image-side surface of any one of the first lens E1 to the fifth lens E5 are aspheric surfaces, and table 3 shows high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 to S14 in example 1.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-5.2853E-01

2.9147E+00

-9.9224E+00

1.8101E+01

-1.9056E+01

1.2115E+01

-4.6119E+00

9.6971E-01

-8.6717E-02

S2

-3.6497E+00

1.5041E+01

-2.4538E+01

-8.3639E+01

5.9134E+02

-1.5054E+03

1.9990E+03

-1.3640E+03

3.7618E+02

S3

7.4027E+00

-1.3808E+02

9.8555E+02

-3.7094E+03

8.2080E+03

-1.1046E+04

8.8720E+03

-3.8918E+03

7.1216E+02

S4

9.0347E+00

-2.7107E+02

1.6868E+03

1.3325E+04

-2.2743E+05

1.2533E+06

-3.4578E+06

4.8291E+06

-2.7225E+06

S5

2.1964E+00

-9.3122E+01

1.6863E+03

-1.7202E+04

1.1798E+05

-5.4829E+05

1.5995E+06

-2.5811E+06

1.7367E+06

S6

-6.3438E-01

1.6383E+02

-7.0264E+03

1.6550E+05

-1.9487E+06

5.8475E+06

1.0446E+08

-1.0846E+09

3.0949E+09

S7

-1.4477E+00

1.0492E+02

-4.8358E+03

1.2533E+05

-1.9190E+06

1.7683E+07

-9.5852E+07

2.8105E+08

-3.4584E+08

S8

1.0495E+01

-2.7191E+02

4.3373E+03

-4.9482E+04

3.9131E+05

-2.0677E+06

6.9392E+06

-1.3383E+07

1.1336E+07

S9

1.2666E+01

-2.1296E+02

2.5832E+03

-2.5037E+04

1.7878E+05

-8.7453E+05

2.7338E+06

-4.8857E+06

3.7705E+06

S10

6.2389E+00

-5.2531E+01

2.3621E+02

-7.1132E+02

1.4999E+03

-2.1460E+03

1.9342E+03

-9.7546E+02

2.0914E+02

TABLE 3

Fig. 2a shows a distortion curve of the image capturing system of embodiment 1, which represents values of distortion magnitude corresponding to different image heights. Fig. 2b shows an on-axis chromatic aberration curve of the image capturing system of embodiment 1, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 2c shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the image capturing system of example 1. As can be seen from fig. 2a to 2c, the image capturing system of embodiment 1 can achieve good imaging quality.

Detailed description of the preferred embodiment 1

Fig. 3 is a schematic view of a lens assembly in an image capturing system according to embodiment 2 of the present invention, the image capturing system sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. Filter E8 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane S13.

As shown in table 4, the basic parameter table of the image capturing system of embodiment 2 is shown, wherein the unit of the curvature radius, the thickness, and the focal length are all millimeters (mm).

TABLE 4

As shown in table 5, in embodiment 2, the total effective focal length f of the image taking system is 0.84mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the image taking system imaging surface S13 is 3.20mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S13 is 1.06 mm.

TABLE 5

The image capturing system in embodiment 2 satisfies:

CT4/f is 0.70; wherein, CT4 is the central thickness of the fourth lens element, and f is the effective focal length of the image capturing system.

tan (Semi-FOV) ═ 3.74; wherein, the Semi-FOV is half of the maximum field angle of the image capturing system.

(Vd2-Vd3+ Vd4)/3 ═ 6.80; vd2, Vd3, and Vd4 are abbe numbers of the second lens, the third lens, and the fourth lens, respectively.

(f2+ f5)/f ═ 2.51; wherein f2 and f5 are the effective focal lengths of the second lens element and the fifth lens element, respectively, and f is the effective focal length of the image capturing system.

(f3+ f4)/f ═ 3.04; wherein f3 and f4 are the effective focal lengths of the third lens element and the fourth lens element, respectively, and f is the effective focal length of the image capturing system.

SD/ImgH is 0.24; wherein SD is the maximum radius of the aperture diaphragm, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

f/EPD 2.26; wherein f is the effective focal length of the image capturing system, and EPD is the entrance pupil diameter of the image capturing system.

TTL/(CT3+ T34+ CT4) ═ 2.99; wherein, TTL is the distance on the optical axis from the object-side surface of the first lens element to the image plane of the image capturing system, CT3 and CT4 are the central thicknesses of the third lens element and the fourth lens element, respectively, and T34 is the distance on the optical axis from the image-side surface of the third lens element to the object-side surface of the fourth lens element.

TD/ImgH is 2.22; and TD is the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

EPD/(ImgH + DT52) ═ 0.21; the EPD is the entrance pupil diameter of the image capturing system, ImgH is half of the diagonal length of the effective pixel area on the image plane, and DT52 is the effective half aperture of the image side surface of the fifth lens element.

(R7+ R8)/(R7-R8) ═ 0.66; wherein R7 and R8 are radii of curvature of the object-side surface and the image-side surface of the fourth lens, respectively.

In example 2, the object-side surface and the image-side surface of any one of the first lens E1 to the fifth lens E5 are aspheric, and table 6 shows the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 to S14 in example 2.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-3.6827E-03

-4.2246E-01

7.7970E-01

-5.7253E-01

1.9324E-01

-1.2107E-02

-1.2058E-02

3.6595E-03

-3.3462E-04

S2

-3.6793E-01

-4.8480E+00

6.9551E+01

-3.5987E+02

1.0159E+03

-1.6894E+03

1.6475E+03

-8.6868E+02

1.9050E+02

S3

-1.1783E+00

1.2159E+01

-6.4329E+01

2.8481E+02

-9.4784E+02

2.0161E+03

-2.5426E+03

1.7347E+03

-4.9415E+02

S4

-7.6732E-01

6.7208E+01

-1.0869E+03

9.9927E+03

-6.0962E+04

2.3870E+05

-5.6322E+05

7.1876E+05

-3.7566E+05

S5

5.6218E-01

-1.1882E+01

-6.0475E-01

1.2854E+03

-1.7955E+04

1.3429E+05

-5.7614E+05

1.3120E+06

-1.2192E+06

S6

2.3948E+00

-1.5607E+02

5.7814E+03

-1.3662E+05

2.1552E+06

-2.1957E+07

1.3549E+08

-4.5206E+08

6.1437E+08

S7

-3.9560E-02

-2.7089E+01

5.7043E+02

-8.8718E+03

1.0811E+05

-8.8701E+05

4.4473E+06

-1.2269E+07

1.4318E+07

S8

-3.2999E-01

-2.9053E+01

6.0865E+02

-7.6850E+03

6.0684E+04

-3.0164E+05

9.1772E+05

-1.5530E+06

1.1190E+06

S9

5.8727E-01

-1.8000E+01

1.9452E+01

1.3696E+03

-1.4075E+04

6.7371E+04

-1.7730E+05

2.4886E+05

-1.4660E+05

S10

-5.3236E-01

-1.0068E+01

8.7541E+01

-3.7314E+02

9.7089E+02

-1.6063E+03

1.6474E+03

-9.5255E+02

2.3614E+02

TABLE 6

Fig. 4a shows a distortion curve of the image capturing system of embodiment 2, which represents values of distortion magnitude corresponding to different image heights. Fig. 4b shows an on-axis chromatic aberration curve of the image capturing system of embodiment 2, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 4c shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the image capturing system of example 2. As can be seen from fig. 4a to 4c, the image capturing system of embodiment 2 can achieve good imaging quality.

Specific example 3

Fig. 5 is a schematic view of a lens assembly in accordance with embodiment 3 of the present invention, the image capturing system sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

As shown in table 4, the basic parameter table of the image capturing system of embodiment 3 is shown, wherein the unit of the curvature radius, the thickness, and the focal length are all millimeters (mm).

TABLE 7

As shown in table 8, in embodiment 3, the total effective focal length f of the image taking system is 0.83mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the image taking system imaging surface S13 is 3.20mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S13 is 1.13 mm.

TABLE 8

The image capturing system in embodiment 3 satisfies:

CT 4/f-0.79; wherein, CT4 is the central thickness of the fourth lens element, and f is the effective focal length of the image capturing system.

(f2+ f5)/f ═ 2.34; wherein f2 and f5 are the effective focal lengths of the second lens element and the fifth lens element, respectively, and f is the effective focal length of the image capturing system.

(f3+ f4)/f 2.93; wherein f3 and f4 are the effective focal lengths of the third lens element and the fourth lens element, respectively, and f is the effective focal length of the image capturing system.

SD/ImgH is 0.20; wherein SD is the maximum radius of the aperture diaphragm, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

f/EPD 2.37; wherein f is the effective focal length of the image capturing system, and EPD is the entrance pupil diameter of the image capturing system.

TTL/(CT3+ T34+ CT4) ═ 2.53; wherein, TTL is the distance on the optical axis from the object-side surface of the first lens element to the image plane of the image capturing system, CT3 and CT4 are the central thicknesses of the third lens element and the fourth lens element, respectively, and T34 is the distance on the optical axis from the image-side surface of the third lens element to the object-side surface of the fourth lens element.

TD/ImgH is 2.24; and TD is the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

EPD/(ImgH + DT52) ═ 0.18; the EPD is the entrance pupil diameter of the image capturing system, ImgH is half of the diagonal length of the effective pixel area on the image plane, and DT52 is the effective half aperture of the image side surface of the fifth lens element.

(R7+ R8)/(R7-R8) ═ 0.67; wherein R7 and R8 are radii of curvature of the object-side surface and the image-side surface of the fourth lens, respectively.

In example 3, the object-side surface and the image-side surface of any one of the first lens E1 to the fifth lens E5 are aspheric, and table 9 shows high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 to S14 in example 3.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-5.4500E-02

-1.9330E-01

4.2427E-01

-3.5213E-01

1.5710E-01

-3.7053E-02

3.5918E-03

-5.4500E-02

-1.9330E-01

S2

-3.7522E-01

1.6773E+00

-4.1639E+00

6.7405E+00

-6.5730E+00

3.5510E+00

-8.0346E-01

-3.7522E-01

1.6773E+00

S3

-4.3177E-01

3.3113E+00

-8.6462E+00

9.9169E+00

-4.6953E+00

9.3020E-02

4.1592E-01

-4.3177E-01

3.3113E+00

S4

9.3923E-01

-4.8534E+00

7.0567E+01

-5.7511E+02

1.7896E+03

-2.4551E+03

1.2650E+03

9.3923E-01

-4.8534E+00

S5

-7.4147E-02

2.9973E+00

-2.4560E+01

1.8177E+02

-9.7518E+02

2.3328E+03

-1.9473E+03

-7.4147E-02

2.9973E+00

S6

-6.4931E-02

2.9155E+01

-4.6704E+02

3.8979E+03

-1.8818E+04

5.7712E+04

-9.6951E+04

-6.4931E-02

2.9155E+01

S7

-2.6987E-01

-1.4366E+01

2.6743E+02

-2.3656E+03

1.1627E+04

-2.9797E+04

3.0575E+04

-2.6987E-01

-1.4366E+01

S8

-2.5614E+00

6.0443E+01

-8.9849E+02

6.7452E+03

-2.7196E+04

5.6320E+04

-4.6577E+04

-2.5614E+00

6.0443E+01

S9

1.2370E+00

7.0048E+00

-2.7881E+02

2.0095E+03

-6.7338E+03

1.1018E+04

-7.0973E+03

1.2370E+00

7.0048E+00

S10

-9.2904E-01

4.4511E+00

-3.3321E+01

1.2002E+02

-2.1447E+02

1.8899E+02

-6.5973E+01

-9.2904E-01

4.4511E+00

TABLE 9

Fig. 6a shows a distortion curve of the image capturing system of embodiment 3, which represents values of distortion magnitude corresponding to different image heights. Fig. 6b shows an on-axis chromatic aberration curve of the image capturing system of embodiment 3, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 6c shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the image capturing system of example 3. As can be seen from fig. 6a to 6c, the image capturing system of embodiment 3 can achieve good imaging quality.

Specific example 4

Fig. 7 is a schematic diagram of a lens assembly structure in an image capturing system according to embodiment 4 of the present invention, the image capturing system sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

As shown in table 10, the basic parameter table of the image capturing system of embodiment 4 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).

Watch 10

As shown in table 11, in example 4, the total effective focal length f of the image taking system is 0.83mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the image taking system imaging surface S13 is 3.20mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S13 is 1.16 mm.

TABLE 11

The image capturing system in embodiment 4 satisfies:

CT 4/f-0.80; wherein, CT4 is the central thickness of the fourth lens element, and f is the effective focal length of the image capturing system.

(f2+ f5)/f ═ 2.21; wherein f2 and f5 are the effective focal lengths of the second lens element and the fifth lens element, respectively, and f is the effective focal length of the image capturing system.

(f3+ f4)/f 2.82; wherein f3 and f4 are the effective focal lengths of the third lens element and the fourth lens element, respectively, and f is the effective focal length of the image capturing system.

SD/ImgH is 0.19; wherein SD is the maximum radius of the aperture diaphragm, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

TTL/(CT3+ T34+ CT4) ═ 2.54; wherein, TTL is the distance on the optical axis from the object-side surface of the first lens element to the image plane of the image capturing system, CT3 and CT4 are the central thicknesses of the third lens element and the fourth lens element, respectively, and T34 is the distance on the optical axis from the image-side surface of the third lens element to the object-side surface of the fourth lens element.

TD/ImgH is 2.20; and TD is the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

(R7+ R8)/(R7-R8) ═ 0.70; wherein R7 and R8 are radii of curvature of the object-side surface and the image-side surface of the fourth lens, respectively.

In example 4, the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric, and table 12 shows the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 through S14 in example 4.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-6.1284E-02

-1.7213E-01

4.0335E-01

-3.5598E-01

1.7141E-01

-4.3864E-02

4.6142E-03

-6.1284E-02

-1.7213E-01

S2

-4.1774E-01

1.9388E+00

-4.9795E+00

8.6043E+00

-9.1490E+00

5.3612E+00

-1.2936E+00

-4.1774E-01

1.9388E+00

S3

-4.4408E-01

3.0665E+00

-6.3601E+00

2.7471E+00

5.9932E+00

-7.6351E+00

2.5940E+00

-4.4408E-01

3.0665E+00

S4

1.1982E+00

-9.1929E+00

9.2849E+01

-6.1717E+02

1.7920E+03

-2.3745E+03

1.1966E+03

1.1982E+00

-9.1929E+00

S5

1.2820E-01

1.7010E+00

-3.4441E+01

4.2873E+02

-2.4652E+03

5.9729E+03

-5.1377E+03

1.2820E-01

1.7010E+00

S6

7.0153E-01

-9.7379E+00

9.8516E+02

-2.3385E+04

2.5254E+05

-1.2984E+06

2.5695E+06

7.0153E-01

-9.7379E+00

S7

-6.9072E-01

-1.5272E+00

7.8397E+01

-8.1630E+02

4.5061E+03

-1.2762E+04

1.4044E+04

-6.9072E-01

-1.5272E+00

S8

-2.1445E+00

5.1395E+01

-8.0225E+02

6.2181E+03

-2.5746E+04

5.4620E+04

-4.6146E+04

-2.1445E+00

5.1395E+01

S9

3.2615E+00

-1.9887E+01

-9.5642E+01

1.3350E+03

-5.4633E+03

1.0016E+04

-6.9894E+03

3.2615E+00

-1.9887E+01

S10

-6.0489E-01

1.2255E+00

-1.8293E+01

8.2895E+01

-1.6348E+02

1.5159E+02

-5.4376E+01

-6.0489E-01

1.2255E+00

TABLE 12

Fig. 8a shows a distortion curve of the image capturing system of embodiment 4, which represents values of distortion magnitude corresponding to different image heights. Fig. 8b shows an on-axis chromatic aberration curve of the image capturing system of embodiment 4, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 8c shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image capturing system of example 4. As can be seen from fig. 8a to 8c, the image capturing system of embodiment 4 can achieve good imaging quality.

Specific example 5

Fig. 9 is a schematic view of a lens assembly structure of an image capturing system according to embodiment 5 of the present invention, the image capturing system sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. Filter E8 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane S13.

As shown in table 13, the basic parameter table of the image capturing system of example 5 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).

Watch 13

As shown in table 14, in example 5, the total effective focal length f of the image taking system is 0.83mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the image taking system imaging surface S13 is 3.20mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S13 is 1.13 mm.

TABLE 14

The image capturing system in embodiment 5 satisfies:

CT 4/f-0.78; wherein, CT4 is the central thickness of the fourth lens element, and f is the effective focal length of the image capturing system.

(f2+ f5)/f ═ 1.95; wherein f2 and f5 are the effective focal lengths of the second lens element and the fifth lens element, respectively, and f is the effective focal length of the image capturing system.

(f3+ f4)/f 2.91; wherein f3 and f4 are the effective focal lengths of the third lens element and the fourth lens element, respectively, and f is the effective focal length of the image capturing system.

f/EPD is 2.23; wherein f is the effective focal length of the image capturing system, and EPD is the entrance pupil diameter of the image capturing system.

EPD/(ImgH + DT52) ═ 0.20; the EPD is the entrance pupil diameter of the image capturing system, ImgH is half of the diagonal length of the effective pixel area on the image plane, and DT52 is the effective half aperture of the image side surface of the fifth lens element.

(R7+ R8)/(R7-R8) ═ 0.77; wherein R7 and R8 are radii of curvature of the object-side surface and the image-side surface of the fourth lens, respectively.

In example 5, the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric, and table 15 shows the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 through S14 in example 5.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-6.1284E-02

-1.7213E-01

4.0335E-01

-3.5598E-01

1.7141E-01

-4.3864E-02

4.6142E-03

-6.1284E-02

-1.7213E-01

S2

-4.1774E-01

1.9388E+00

-4.9795E+00

8.6043E+00

-9.1490E+00

5.3612E+00

-1.2936E+00

-4.1774E-01

1.9388E+00

S3

-4.4408E-01

3.0665E+00

-6.3601E+00

2.7471E+00

5.9932E+00

-7.6351E+00

2.5940E+00

-4.4408E-01

3.0665E+00

S4

1.1982E+00

-9.1929E+00

9.2849E+01

-6.1717E+02

1.7920E+03

-2.3745E+03

1.1966E+03

1.1982E+00

-9.1929E+00

S5

1.2820E-01

1.7010E+00

-3.4441E+01

4.2873E+02

-2.4652E+03

5.9729E+03

-5.1377E+03

1.2820E-01

1.7010E+00

S6

7.0153E-01

-9.7379E+00

9.8516E+02

-2.3385E+04

2.5254E+05

-1.2984E+06

2.5695E+06

7.0153E-01

-9.7379E+00

S7

-6.9072E-01

-1.5272E+00

7.8397E+01

-8.1630E+02

4.5061E+03

-1.2762E+04

1.4044E+04

-6.9072E-01

-1.5272E+00

S8

-2.1445E+00

5.1395E+01

-8.0225E+02

6.2181E+03

-2.5746E+04

5.4620E+04

-4.6146E+04

-2.1445E+00

5.1395E+01

S9

3.2615E+00

-1.9887E+01

-9.5642E+01

1.3350E+03

-5.4633E+03

1.0016E+04

-6.9894E+03

3.2615E+00

-1.9887E+01

S10

-6.0489E-01

1.2255E+00

-1.8293E+01

8.2895E+01

-1.6348E+02

1.5159E+02

-5.4376E+01

-6.0489E-01

1.2255E+00

Watch 15

Fig. 10a shows a distortion curve of the image capturing system of embodiment 5, which represents values of distortion magnitude corresponding to different image heights. Fig. 10b shows an on-axis chromatic aberration curve of the image capturing system of embodiment 5, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 10c shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image capturing system of example 5. As can be seen from fig. 10a to 10c, the image capturing system of embodiment 5 can achieve good imaging quality.

Specific example 6

Fig. 11 is a schematic view of a lens assembly in an image capturing system according to embodiment 6 of the present invention, the image capturing system sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a convex image-side surface S10. Filter E8 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane S13.

As shown in table 16, the basic parameter table of the image capturing system of example 6 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).

TABLE 16

As shown in table 17, in example 6, the total effective focal length f of the image taking system is 0.99mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the image taking system imaging surface S13 is 2.71mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S13 is 0.98 mm.

Half of the maximum field angle Semi-FOV of the optical imaging lens is 76.7 °.

TABLE 17

The image capturing system in embodiment 6 satisfies:

CT 4/f-0.51; wherein, CT4 is the central thickness of the fourth lens element, and f is the effective focal length of the image capturing system.

tan (Semi-FOV) ═ 4.22; wherein, the Semi-FOV is half of the maximum field angle of the image capturing system.

(f2+ f5)/f ═ 3.26; wherein f2 and f5 are the effective focal lengths of the second lens element and the fifth lens element, respectively, and f is the effective focal length of the image capturing system.

(f3+ f4)/f 2.49; wherein f3 and f4 are the effective focal lengths of the third lens element and the fourth lens element, respectively, and f is the effective focal length of the image capturing system.

SD/ImgH ═ 0.22; wherein SD is the maximum radius of the aperture diaphragm, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

f/EPD is 2.30; wherein f is the effective focal length of the image capturing system, and EPD is the entrance pupil diameter of the image capturing system.

TTL/(CT3+ T34+ CT4) ═ 3.29; wherein, TTL is the distance on the optical axis from the object-side surface of the first lens element to the image plane of the image capturing system, CT3 and CT4 are the central thicknesses of the third lens element and the fourth lens element, respectively, and T34 is the distance on the optical axis from the image-side surface of the third lens element to the object-side surface of the fourth lens element.

TD/ImgH is 2.06; and TD is the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

EPD/(ImgH + DT52) ═ 0.28; the EPD is the entrance pupil diameter of the image capturing system, ImgH is half of the diagonal length of the effective pixel area on the image plane, and DT52 is the effective half aperture of the image side surface of the fifth lens element.

(R7+ R8)/(R7-R8) ═ 0.62; wherein R7 and R8 are radii of curvature of the object-side surface and the image-side surface of the fourth lens, respectively.

In example 6, the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric, and table 18 shows high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 through S14 in example 6.

Watch 18

Fig. 12a shows a distortion curve of the image capturing system of embodiment 6, which represents values of distortion magnitude corresponding to different image heights. Fig. 12b shows an on-axis chromatic aberration curve of the image capturing system of embodiment 6, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 12c shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image capturing system of example 6. As can be seen from fig. 12a to 12c, the image capturing system of embodiment 6 can achieve good imaging quality.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, improvements, equivalents and the like that fall within the spirit and principle of the present invention are intended to be included within the scope of the present invention. .

Claims

1. An image capturing system, in order from an object side to an image side along an optical axis, comprising:

a first lens having an optical power;

the image side of the second lens is a concave surface;

a fifth lens having a negative optical power;

2. The image capture system of claim 1, wherein: half of the maximum field angle of the image capturing system Semi-FOV satisfies: tan (Semi-FOV) > 3.7.

3. The image capture system of claim 1, wherein: the abbe number Vd2 of the second lens, the abbe number Vd3 of the third lens and the abbe number Vd4 of the fourth lens satisfy: (Vd2-Vd3+ Vd4)/3< 31.

4. The image capture system of claim 1, wherein: the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens and the effective focal length f of the image capturing system satisfy the following conditions: 2< (f3+ f4)/f < 4.

5. The image capture system of claim 1, wherein: the maximum radius SD of the aperture diaphragm and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: SD/ImgH < 0.25.

6. The image capture system of claim 1, wherein: the effective focal length f of the image capturing system and the entrance pupil diameter EPD of the image capturing system satisfy: 2.1< f/EPD < 2.4.

7. The image capture system of claim 1, wherein: the distance TTL from the object side surface of the first lens to the image surface of the image taking system on the optical axis, the central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens and the distance T34 from the image side surface of the third lens to the object side surface of the fourth lens on the optical axis satisfy that: 2.3< TTL/(CT3+ T34+ CT4) < 3.3.

8. The image capture system of claim 1, wherein: the distance TD of the object side surface of the first lens to the image side surface of the fifth lens on the optical axis and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: 2.0< TD/ImgH < 2.3.

9. The image capture system of claim 1, wherein: the entrance pupil diameter EPD of the image capturing system, half of the diagonal length ImgH of the effective pixel area on the imaging surface and the effective half caliber DT52 of the image side surface of the fifth lens meet the following requirements: 0.15< EPD/(ImgH + DT52) < 0.3.

10. The image capture system of claim 1, wherein: the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: 0.6< (R7+ R8)/(R7-R8) < 0.8.

11. An image capturing system, in order from an object side to an image side along an optical axis, comprising:

a first lens having an optical power;

a second lens having a negative optical power;

a fifth lens having a negative optical power;

12. The image capture system of claim 11, wherein: the central thickness CT4 of the fourth lens and the effective focal length f of the image capturing system satisfy: 0.5< CT4/f < 0.9.

13. The image capture system of claim 11, wherein: half of the maximum field angle of the image capturing system Semi-FOV satisfies: tan (Semi-FOV) > 3.7.

14. The image capture system of claim 11, wherein: the abbe number Vd2 of the second lens, the abbe number Vd3 of the third lens and the abbe number Vd4 of the fourth lens satisfy: (Vd2-Vd3+ Vd4)/3< 31.

15. The image capture system of claim 11, wherein: the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens and the effective focal length f of the image capturing system satisfy the following conditions: 2< (f3+ f4)/f < 4.

16. The image capture system of claim 11, wherein: the maximum radius SD of the aperture diaphragm and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: SD/ImgH < 0.25.

17. The image capture system of claim 11, wherein: the distance TTL from the object side surface of the first lens to the image surface of the image taking system on the optical axis, the central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens and the distance T34 from the image side surface of the third lens to the object side surface of the fourth lens on the optical axis satisfy that: 2.3< TTL/(CT3+ T34+ CT4) < 3.3.

18. The image capture system of claim 11, wherein: the distance TD of the object side surface of the first lens to the image side surface of the fifth lens on the optical axis and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: 2.0< TD/ImgH < 2.3.

19. The image capture system of claim 11, wherein: the entrance pupil diameter EPD of the image capturing system, half of the diagonal length ImgH of the effective pixel area on the imaging surface and the effective half caliber DT52 of the image side surface of the fifth lens meet the following requirements: 0.15< EPD/(ImgH + DT52) < 0.3.

20. The image capture system of claim 11, wherein: the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: 0.6< (R7+ R8)/(R7-R8) < 0.8.