CN211741693U - Camera lens - Google Patents

Abstract

The application discloses a camera lens, which comprises in order from an object side to an image side along an optical axis: a first lens having a positive optical power; a second lens having optical power, an object side surface of which is concave at a paraxial region and convex at a paraxial region; a third lens having optical power; a fourth lens having an optical power; and a fifth lens having a negative optical power. The distance TTL from the object side surface of the first lens to the imaging surface of the camera lens on the optical axis and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the camera lens satisfy that: TTL/ImgH is less than or equal to 1.4; and the vertical distance Yc21 between the critical point of the object side surface of the second lens and the optical axis and the spacing distance T12 between the first lens and the second lens on the optical axis satisfy that: 3.5 < Yc21/T12 < 4.5.

Description

Camera lens

Technical Field

The present application relates to the field of optical elements, and in particular, to an imaging lens.

Background

With the continuous development of portable electronic products such as smart phones, people have higher and higher requirements on the performance of optical camera lenses, such as imaging quality. In addition, for cost reasons, a five-piece lens system is still an important choice in most portable electronic products such as smart phones.

In recent years, smart terminal manufacturers are increasingly pursuing high resolution of lenses and high imaging quality. How to achieve sharp imaging with fewer lenses has become a major factor of their attention. The difficulty of optical design is greatly improved while the production cost is reduced by designing the lens with fewer lenses.

SUMMERY OF THE UTILITY MODEL

An aspect of the present disclosure provides an image capturing lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens having a positive optical power; a second lens having optical power, an object side surface of which is concave at a paraxial region and convex at a paraxial region; a third lens having optical power; a fourth lens having an optical power; and a fifth lens having a negative optical power. The distance TTL from the object side surface of the first lens to the imaging surface of the camera lens on the optical axis and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the camera lens can satisfy the following conditions: TTL/ImgH is less than or equal to 1.4; and the vertical distance Yc21 from the critical point of the object side surface of the second lens to the optical axis and the separation distance T12 between the first lens and the second lens on the optical axis can satisfy the following conditions: 3.5 < Yc21/T12 < 4.5.

In one embodiment, at least one of the object-side surface of the first lens element and the image-side surface of the fifth lens element is an aspheric surface.

In one embodiment, the total effective focal length f of the image pickup lens and the radius of curvature R3 of the object side surface of the second lens may satisfy: f/R3 is less than or equal to-0.5.

In one embodiment, the total effective focal length f of the imaging lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens may satisfy: f/(CT2+ CT3) > 7.0.

In one embodiment, the entrance pupil diameter EPD of the imaging lens may be separated from the second and third lenses by a distance T23 on the optical axis that satisfies: 5.0 < EPD/T23 < 7.5.

In one embodiment, the maximum effective radius DT41 of the object-side surface of the fourth lens, the maximum effective radius DT32 of the image-side surface of the third lens, and the separation distance ET34 from the edge of the third lens to the edge of the fourth lens on the optical axis may satisfy: 0.8 < (DT41-DT32)/ET34 < 1.5.

In one embodiment, the total effective focal length f of the image pickup lens and the radius of curvature R9 of the object side surface of the fifth lens may satisfy: f/R9 is more than 0 and less than or equal to 0.5.

In one embodiment, the effective focal length f5 of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -2.5 < f5/R10 < -1.5.

In one embodiment, the maximum effective radius DT41 of the object-side surface of the fourth lens is separated from the third lens and the fourth lens by a distance T34 on the optical axis, which satisfies: DT41/T34 is more than or equal to 1.9 and less than 2.5.

In one embodiment, the distance T45 between the fourth lens and the fifth lens on the optical axis and the distance SAG51 on the optical axis from the intersection point of the object side surface of the fifth lens and the optical axis to the effective radius vertex of the object side surface of the fifth lens may satisfy: i T45+ SAG 51I < 0.3 mm.

In one embodiment, the total effective focal length f of the image pickup lens, the effective focal length f1 of the first lens, and the effective focal length f5 of the fifth lens may satisfy: f/f1-f/f5 is more than 2.0 and less than 3.0.

In one embodiment, the total effective focal length f of the image pickup lens and the effective focal length f2 of the second lens may satisfy: -0.7 < f/f2 < 0.1.

Another aspect of the present disclosure provides an imaging lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens having a positive optical power; a second lens having optical power, an object side surface of which is concave at a paraxial region and convex at a paraxial region; a third lens having optical power; a fourth lens having an optical power; and a fifth lens having a negative optical power. The entrance pupil diameter EPD of the imaging lens and the separation distance T23 on the optical axis between the second lens and the third lens can satisfy: 5.0 < EPD/T23 < 7.5.

The imaging lens adopts a plurality of lenses (for example, five lenses), and has at least one beneficial effect of ultrathin, good processing formability, high imaging quality and the like by reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application;

fig. 2A to 2D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 1;

fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application;

fig. 4A to 4D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 2;

fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application;

fig. 6A to 6D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 3;

fig. 7 is a schematic configuration diagram showing an imaging lens according to embodiment 4 of the present application;

fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 4;

fig. 9 is a schematic configuration diagram showing an imaging lens according to embodiment 5 of the present application;

fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 5;

fig. 11 is a schematic configuration diagram showing an imaging lens according to embodiment 6 of the present application; and

fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 6;

fig. 13 is a schematic configuration diagram showing an imaging lens according to embodiment 7 of the present application;

fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 7;

fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 8 of the present application; and

fig. 16A to 16D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens of embodiment 8.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

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 application.

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.

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 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.

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.

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 in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles, and other aspects of the present application are described in detail below.

An image pickup lens according to an exemplary embodiment of the present application may include five lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, respectively. The five lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the fifth lens can have a spacing distance therebetween.

In an exemplary embodiment, the first lens may have a positive optical power; the second lens may have a positive or negative power, and its object-side surface may be concave at the paraxial region and convex at the paraxial region; the third lens may have a positive optical power or a negative optical power; the fourth lens may have a positive power or a negative power; the fifth lens may have a negative optical power.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: TTL/ImgH is less than or equal to 1.4, wherein the TTL is the distance between the object side surface of the first lens and the imaging surface of the camera lens on the optical axis, and the ImgH is half of the length of the diagonal line of the effective pixel area on the imaging surface of the camera lens. The TTL/ImgH is less than or equal to 1.4, the image height is favorably avoided being too small, and the system miniaturization is favorably realized.

Alternatively, the object side surface of the second lens may be aspherical. In an exemplary embodiment, the object side surface of the second lens may be concave in the paraxial region and convex in the paraxial region, such that the object side surface of the second lens has a negative curvature in the paraxial region and a positive curvature in the paraxial region. In the present application, a point at which the curvature on the object-side surface of the second lens transitions from a negative value to a positive value may be referred to as a critical point of the object-side surface of the second lens. At this critical point, the curvature is zero.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 3.5 < Yc21/T12 < 4.5, wherein Yc21 is the perpendicular distance from the critical point of the object side surface of the second lens to the optical axis, and T12 is the separation distance between the first lens and the second lens on the optical axis. More specifically, Yc21 and T12 further may satisfy: 3.6 < Yc21/T12 < 4.3. The requirements that Yc21/T12 is more than 3.5 and less than 4.5 are met, and the off-axis aberration is effectively corrected while the processing difficulty and the processing cost are reduced.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: and f/R3 is less than or equal to-0.5, wherein f is the total effective focal length of the camera lens, and R3 is the curvature radius of the object side surface of the second lens. More specifically, f and R3 further satisfy-1.0. ltoreq. f/R3. ltoreq. 0.5. The f/R3 is less than or equal to-0.5, which is beneficial to controlling the angle of the chief ray and leading the optical system to better match the chip CRA.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: f/(CT2+ CT3) > 7.0, where f is the total effective focal length of the imaging lens, CT2 is the center thickness of the second lens, and CT3 is the center thickness of the third lens. More specifically, f, CT2, and CT3 further satisfy: 7.5 < f/(CT2+ CT3) < 10. The method satisfies f/(CT2+ CT3) > 7.0, can effectively improve the degree of freedom of lens surface change, and can enhance the capability of the camera lens for correcting curvature of field and astigmatism.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 5.0 < EPD/T23 < 7.5, wherein EPD is the entrance pupil diameter of the camera lens, and T23 is the separation distance between the second lens and the third lens on the optical axis. More specifically, EPD and T23 may further satisfy: 5.5 < EPD/T23 < 7.4. The requirements of EPD/T23 being more than 5.0 and less than 7.5 are met, the miniaturization of the system is facilitated, the camera is better suitable for continuously developed portable electronic products, the light flux and the relative illumination of the camera can be ensured, and the imaging effect in a dark environment is enhanced.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.8 < (DT41-DT32)/ET34 < 1.5, wherein DT41 is the maximum effective radius of the object side surface of the fourth lens, DT32 is the maximum effective radius of the image side surface of the third lens, and ET34 is the separation distance on the optical axis from the edge of the third lens to the edge of the fourth lens. More specifically, DT41, DT32 and ET34 may further satisfy: 0.8 < (DT41-DT32)/ET34 < 1.3. Satisfies 0.8 < (DT41-DT32)/ET34 < 1.5, is beneficial to reducing the processing difficulty and the processing cost, and can effectively reduce the off-axis aberration by controlling the size of the maximum effective radius of the lens.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: f/R9 is more than 0 and less than or equal to 0.5, wherein f is the total effective focal length of the camera lens, and R9 is the curvature radius of the object side surface of the fifth lens. More specifically, f and R9 further satisfy: f/R9 is more than 0.1 and less than or equal to 0.5. The requirement that f/R9 is more than 0 and less than or equal to 0.5 can ensure that the lens can improve the aberration correction capability of the system and can obtain better manufacturability while keeping the ultrathin characteristic.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: -2.5 < f5/R10 < -1.5, wherein f5 is the effective focal length of the fifth lens and R10 is the radius of curvature of the image-side surface of the fifth lens. More specifically, f5 and R10 may further satisfy: -2.5 < f5/R10 < -1.9. Satisfying-2.5 < f5/R10 < -1.5 can ensure that the deflection angle of the fifth lens is in a reasonable range, effectively control the sensitivity of the system, and simultaneously be beneficial to reducing the face inclination angle at the edge of the image side surface of the fifth lens and eliminating the ghost image risk.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1.9 ≦ DT41/T34 < 2.5, where DT41 is the maximum effective radius of the object-side surface of the fourth lens, and T34 is the separation distance between the third lens and the fourth lens on the optical axis. The requirement that DT41/T34 is more than or equal to 1.9 and less than 2.5 is met, the assembly difficulty of the system is favorably reduced, the capability of the optical camera system for correcting the off-axis aberration is favorably improved, and therefore higher image quality is achieved.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: | T45+ SAG51| < 0.3mm, where T45 is the separation distance on the optical axis of the fourth lens and the fifth lens, and SAG51 is the distance on the optical axis from the intersection of the object-side surface of the fifth lens and the optical axis to the effective radius vertex of the object-side surface of the fifth lens. The requirement of | T45+ SAG51| is less than 0.3mm, so that the system can obtain enough spacing distance and higher degree of freedom of lens surface change, and the capability of correcting astigmatism and curvature of field of the optical pick-up lens is improved.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 2.0 < f/f1-f/f5 < 3.0, where f is the total effective focal length of the image capture lens, f1 is the effective focal length of the first lens, and f5 is the effective focal length of the fifth lens. More specifically, f1, and f5 may further satisfy: f/f1-f/f5 is more than 2.1 and less than 2.9. The requirement that f/f1-f/f5 is more than 2.0 and less than 3.0 is met, the size of the system can be effectively shortened, the ultra-thin characteristic is kept, meanwhile, the over-concentration of the focal power of the system is avoided, and the system can better correct aberration by matching with other lenses.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: -0.7 < f/f2 < 0.1, where f is the total effective focal length of the camera lens and f2 is the effective focal length of the second lens. The optical lens meets the condition that f/f2 is more than-0.7 and less than 0.1, and is beneficial to adjusting the light focusing position, thereby improving the light converging capability of the system, shortening the total length of the lens and being beneficial to improving chromatic aberration.

In an exemplary embodiment, an imaging lens according to the present application further includes a stop disposed between the object side and the first lens. Alternatively, the above-described image pickup lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an image forming surface.

The imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, five lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, incident light can be effectively converged, the total length of the camera lens is reduced, and the machinability of the camera lens is improved, so that the structure of each lens is more compact, the camera lens is more beneficial to production and processing, and the practicability is higher. With the above configuration, the imaging lens according to the exemplary embodiment of the present application can have characteristics such as a large image plane, ultra-thinning, good imaging quality, and the like.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the fifth lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, 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. 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, second, third, fourth, and fifth lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting an imaging lens may be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the imaging lens is not limited to including five lenses. The camera lens may also include other numbers of lenses, if desired.

Specific examples of an imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application.

As shown in fig. 1, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, 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 concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave 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 concave image-side surface S10. Filter E6 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 surface S13.

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

TABLE 1

In this example, the total effective focal length f of the imaging lens is 4.63mm, and the maximum field angle FOV of the imaging lens is 78.4 °.

In embodiment 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 the surface shape x 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 shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S10 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.3177E-02

2.4539E-02

-1.2598E-01

3.8235E-01

-8.3165E-01

1.1542E+00

-9.6880E-01

4.4239E-01

-8.4846E-02

S2

-9.5643E-03

-1.6109E-01

8.4587E-01

-2.5680E+00

4.7608E+00

-5.4907E+00

3.8322E+00

-1.4768E+00

2.3955E-01

S3

-4.3630E-02

1.7737E-01

-4.4952E-01

1.2253E+00

-2.2016E+00

2.4270E+00

-1.5696E+00

5.5150E-01

-8.3357E-02

S4

1.1540E-02

1.0873E-01

-9.9301E-02

4.9530E-01

-1.8673E+00

4.0349E+00

-4.8722E+00

3.1099E+00

-8.0804E-01

S5

-1.3786E-01

-1.3452E-01

9.2673E-01

-3.4188E+00

7.5338E+00

-1.0287E+01

8.5007E+00

-3.8819E+00

7.5775E-01

S6

-1.2338E-01

-7.2690E-03

1.1703E-01

-3.4517E-01

5.3868E-01

-4.7564E-01

2.3208E-01

-5.1961E-02

3.0093E-03

S7

-1.9067E-02

-2.4258E-03

-2.0769E-02

3.6341E-02

-3.3587E-02

1.6657E-02

-4.5942E-03

6.7841E-04

-4.2095E-05

S8

-2.2936E-03

7.6514E-03

-1.2924E-02

1.8156E-02

-1.3852E-02

5.4119E-03

-1.1183E-03

1.1678E-04

-4.8390E-06

S9

-2.7582E-01

1.7507E-01

-6.4802E-02

1.5678E-02

-2.5167E-03

2.6559E-04

-1.7737E-05

6.8085E-07

-1.1469E-08

S10

-1.1474E-01

6.2048E-02

-2.1277E-02

4.8123E-03

-7.2307E-04

7.0549E-05

-4.2598E-06

1.4415E-07

-2.0910E-09

TABLE 2

Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 1. Fig. 2C shows a distortion curve of the imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 1, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the imaging lens system according to embodiment 1 can achieve good imaging quality.

Example 2

An imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application.

As shown in fig. 3, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, 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 concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave 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 concave image-side surface S10. Filter E6 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 surface S13.

In the present example, the total effective focal length f of the imaging lens is 4.59mm, and the maximum field angle FOV of the imaging lens is 76.3 °.

Table 3 shows a basic parameter table of the imaging lens of embodiment 2, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-8.9327E-03

-6.2771E-03

-1.7556E-02

1.6283E-01

-5.6240E-01

9.6232E-01

-9.0339E-01

4.4243E-01

-8.9507E-02

S2

-1.3673E-02

-6.3906E-02

2.9996E-01

-8.1198E-01

1.3612E+00

-1.4483E+00

9.4287E-01

-3.3877E-01

4.9847E-02

S3

-5.3867E-02

1.6626E-01

-2.8919E-02

-5.7799E-01

1.7524E+00

-2.6788E+00

2.3270E+00

-1.0729E+00

2.0197E-01

S4

3.2392E-02

7.4155E-02

1.9032E-01

-7.9551E-01

1.4014E+00

-1.0699E+00

-1.3609E-02

5.1607E-01

-2.0611E-01

S5

-1.6676E-01

1.5459E-01

-7.0059E-01

1.7362E+00

-2.2249E+00

5.6912E-01

1.9239E+00

-2.1945E+00

7.5054E-01

S6

-1.1074E-01

-6.8008E-02

3.4300E-01

-9.2485E-01

1.4501E+00

-1.3397E+00

6.9947E-01

-1.7823E-01

1.5214E-02

S7

-4.8088E-03

-4.8631E-02

7.9244E-02

-7.4190E-02

4.2149E-02

-1.5968E-02

3.8361E-03

-5.0600E-04

2.7238E-05

S8

-9.8586E-03

-7.4640E-03

1.8483E-02

2.5452E-03

-1.2634E-02

6.8999E-03

-1.6939E-03

2.0250E-04

-9.6032E-06

S9

-3.8369E-01

2.8739E-01

-1.2575E-01

3.6040E-02

-6.8641E-03

8.5980E-04

-6.8108E-05

3.0968E-06

-6.1672E-08

S10

-1.4751E-01

9.1552E-02

-3.5162E-02

8.7207E-03

-1.4231E-03

1.5004E-04

-9.7572E-06

3.5489E-07

-5.5327E-09

TABLE 4

Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 2. Fig. 4C shows a distortion curve of the imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 2, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 4A to 4D, the imaging lens according to embodiment 2 can achieve good imaging quality.

Example 3

An imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application.

As shown in fig. 5, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, 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 concave 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 concave 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 concave image-side surface S10. Filter E6 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 surface S13.

In the present example, the total effective focal length f of the imaging lens is 4.68mm, and the maximum field angle FOV of the imaging lens is 77.3 °.

Table 5 shows a basic parameter table of the imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.5900E-02

5.5078E-02

-2.7617E-01

7.9562E-01

-1.4678E+00

1.7023E+00

-1.2047E+00

4.7298E-01

-7.9214E-02

S2

-1.5677E-02

-5.3845E-02

2.8235E-01

-8.2131E-01

1.4701E+00

-1.6696E+00

1.1648E+00

-4.5251E-01

7.4112E-02

S3

-3.7189E-02

2.0913E-01

-5.8084E-01

1.3585E+00

-2.0393E+00

1.8244E+00

-8.8322E-01

1.8511E-01

-5.1146E-03

S4

2.8224E-02

2.6777E-02

3.7782E-01

-1.5773E+00

3.4640E+00

-4.4390E+00

3.3055E+00

-1.2929E+00

2.0178E-01

S5

-1.2517E-01

-7.9488E-02

5.6060E-01

-2.0517E+00

4.3024E+00

-5.4807E+00

4.1535E+00

-1.7082E+00

2.9584E-01

S6

-8.5266E-02

-1.1394E-01

4.7096E-01

-1.1118E+00

1.5763E+00

-1.3619E+00

6.9587E-01

-1.8859E-01

2.0499E-02

S7

-3.2265E-03

-7.4900E-02

1.1811E-01

-1.0814E-01

6.1106E-02

-2.2891E-02

5.4633E-03

-7.2869E-04

4.0378E-05

S8

-1.7330E-02

9.5662E-03

-2.0572E-02

4.1304E-02

-3.3912E-02

1.3978E-02

-3.1193E-03

3.6260E-04

-1.7316E-05

S9

-3.7102E-01

2.7661E-01

-1.1922E-01

3.3371E-02

-6.1783E-03

7.4984E-04

-5.7390E-05

2.5148E-06

-4.8147E-08

S10

-1.4239E-01

8.7754E-02

-3.2635E-02

7.8758E-03

-1.2649E-03

1.3363E-04

-8.8943E-06

3.3772E-07

-5.5754E-09

TABLE 6

Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 3. Fig. 6C shows a distortion curve of the imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 6A to 6D, the imaging lens system according to embodiment 3 can achieve good imaging quality.

Example 4

An imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic configuration diagram of an imaging lens according to embodiment 4 of the present application.

As shown in fig. 7, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, 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 concave 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 concave 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 concave image-side surface S10. Filter E6 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 surface S13.

In the present example, the total effective focal length f of the imaging lens is 4.71mm, and the maximum field angle FOV of the imaging lens is 82.0 °.

Table 7 shows a basic parameter table of the imaging lens of embodiment 4, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 7

TABLE 8

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

Example 5

An imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic configuration diagram of an imaging lens according to embodiment 5 of the present application.

As shown in fig. 9, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, 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 concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave 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 concave image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter E6 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 surface S13.

In this example, the total effective focal length f of the imaging lens is 4.85mm, and the maximum field angle FOV of the imaging lens is 81.7 °.

Table 9 shows a basic parameter table of the imaging lens of embodiment 5, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.1813E-02

9.0217E-03

-7.2035E-02

2.2222E-01

-4.6492E-01

6.0151E-01

-4.6999E-01

2.0085E-01

-3.6183E-02

S2

-1.9610E-02

-6.2307E-02

3.2861E-01

-9.8708E-01

1.8121E+00

-2.0797E+00

1.4479E+00

-5.5738E-01

9.0282E-02

S3

-3.7828E-02

1.7783E-01

-4.3483E-01

1.2052E+00

-2.3384E+00

2.8573E+00

-2.0941E+00

8.4624E-01

-1.4641E-01

S4

1.9868E-02

1.3990E-01

-3.2627E-01

1.1190E+00

-2.7252E+00

4.2386E+00

-3.9886E+00

2.0809E+00

-4.5764E-01

S5

-1.1048E-01

-1.5536E-01

1.1714E+00

-4.6700E+00

1.1136E+01

-1.6438E+01

1.4705E+01

-7.3028E+00

1.5502E+00

S6

-1.2788E-01

5.5901E-02

-7.9241E-02

1.3778E-01

-2.0982E-01

2.2373E-01

-1.4643E-01

5.3592E-02

-8.2321E-03

S7

-6.1197E-03

-2.9664E-02

3.1225E-02

-1.7766E-02

4.1617E-03

-1.3416E-04

-1.0185E-04

1.6312E-05

-7.6901E-07

S8

-1.1856E-02

-1.9554E-02

3.6347E-02

-2.4328E-02

8.2340E-03

-1.5811E-03

1.7608E-04

-1.0660E-05

2.7251E-07

S9

-2.0961E-01

1.0729E-01

-3.0229E-02

5.4193E-03

-6.3947E-04

4.9499E-05

-2.4195E-06

6.7671E-08

-8.2376E-10

S10

-7.6820E-02

3.4743E-02

-9.8038E-03

1.7331E-03

-1.8804E-04

1.1761E-05

-3.5950E-07

2.1060E-09

8.9070E-11

Watch 10

Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 5. Fig. 10C shows a distortion curve of the imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 5, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 10A to 10D, the imaging lens according to embodiment 5 can achieve good imaging quality.

Example 6

An imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic configuration diagram of an imaging lens according to embodiment 6 of the present application.

As shown in fig. 11, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, 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 concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave 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 concave image-side surface S10. Filter E6 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 surface S13.

In this example, the total effective focal length f of the imaging lens is 4.58mm, and the maximum field angle FOV of the imaging lens is 82.1 °.

Table 11 shows a basic parameter table of the imaging lens of embodiment 6, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 11

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.0707E-02

3.0995E-03

-6.5484E-02

2.8436E-01

-7.5581E-01

1.1648E+00

-1.0402E+00

4.9598E-01

-9.8359E-02

S2

-2.1229E-02

-5.8485E-02

3.2745E-01

-1.0220E+00

1.9594E+00

-2.3610E+00

1.7348E+00

-7.0790E-01

1.2148E-01

S3

-4.5015E-02

1.6070E-01

-3.2048E-01

8.0201E-01

-1.3207E+00

1.2127E+00

-5.1405E-01

2.9772E-02

2.6951E-02

S4

5.3662E-04

1.3607E-01

-1.4643E-01

6.2649E-01

-2.2160E+00

4.7281E+00

-5.7514E+00

3.7268E+00

-9.8933E-01

S5

-1.4148E-01

-1.4929E-01

1.0526E+00

-4.0192E+00

9.1824E+00

-1.2959E+01

1.1025E+01

-5.1580E+00

1.0264E+00

S6

-1.1714E-01

-7.7459E-02

4.1242E-01

-1.1360E+00

1.8335E+00

-1.7735E+00

1.0025E+00

-2.9743E-01

3.5065E-02

S7

4.1037E-03

-6.3640E-02

9.5373E-02

-8.7531E-02

4.9288E-02

-1.8844E-02

4.6793E-03

-6.4884E-04

3.7093E-05

S8

5.0349E-03

-2.4859E-02

3.5557E-02

-7.8376E-03

-1.0151E-02

7.0817E-03

-1.8939E-03

2.3770E-04

-1.1662E-05

S9

-3.8474E-01

2.8793E-01

-1.2556E-01

3.5727E-02

-6.7276E-03

8.3022E-04

-6.4600E-05

2.8779E-06

-5.6016E-08

S10

-1.5182E-01

9.4474E-02

-3.6430E-02

9.0288E-03

-1.4582E-03

1.4965E-04

-9.2189E-06

3.0401E-07

-3.9939E-09

TABLE 12

Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 6. Fig. 12C shows a distortion curve of the imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 6, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 12A to 12D, the imaging lens according to embodiment 6 can achieve good imaging quality.

Example 7

An imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an imaging lens according to embodiment 7 of the present application.

As shown in fig. 13, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, 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 positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave 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 concave image-side surface S10. Filter E6 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 surface S13.

In this example, the total effective focal length f of the imaging lens is 4.39mm, and the maximum field angle FOV of the imaging lens is 82.5 °.

Table 13 shows a basic parameter table of the imaging lens of embodiment 7, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 13

TABLE 14

Fig. 14A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 7, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 7. Fig. 14C shows a distortion curve of the imaging lens of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 7, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 14A to 14D, the imaging lens according to embodiment 7 can achieve good imaging quality.

Example 8

An imaging lens according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 8 of the present application.

As shown in fig. 15, the imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, 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 concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. Filter E6 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 surface S13.

In the present example, the total effective focal length f of the imaging lens is 4.78mm, and the maximum field angle FOV of the imaging lens is 79.0 °.

Table 15 shows a basic parameter table of the imaging lens of embodiment 8, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 16 shows high-order term coefficients that can be used for each aspherical mirror surface in example 8, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 15

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.2031E-02

1.4627E-03

-6.3156E-02

2.4308E-01

-5.7354E-01

8.0194E-01

-6.6397E-01

2.9801E-01

-5.6259E-02

S2

-2.2030E-02

-8.0890E-02

5.0715E-01

-1.7158E+00

3.5612E+00

-4.6145E+00

3.6209E+00

-1.5693E+00

2.8663E-01

S3

-5.4956E-02

1.7222E-01

-2.0260E-01

3.3537E-01

-5.0275E-01

4.1474E-01

-8.3161E-02

-8.3275E-02

3.5795E-02

S4

-5.5218E-03

1.2928E-01

2.0560E-01

-1.3655E+00

3.8358E+00

-6.2258E+00

5.9071E+00

-2.9851E+00

6.2233E-01

S5

-1.6118E-01

2.7631E-01

-1.5841E+00

5.8690E+00

-1.3672E+01

1.9774E+01

-1.7188E+01

8.1950E+00

-1.6299E+00

S6

-1.4267E-01

1.0647E-01

-2.5762E-01

4.6845E-01

-5.5421E-01

4.2004E-01

-1.9874E-01

5.7966E-02

-8.2456E-03

S7

-1.5453E-03

-5.0322E-02

4.2714E-02

-2.8212E-02

1.1475E-02

-4.1686E-03

1.3632E-03

-2.5633E-04

1.8683E-05

S8

-3.5349E-02

2.1915E-03

1.4399E-02

-1.2455E-02

4.5373E-03

-8.6825E-04

9.1109E-05

-4.9218E-06

1.0517E-07

S9

-2.6855E-01

1.6937E-01

-6.2149E-02

1.4861E-02

-2.3495E-03

2.4259E-04

-1.5697E-05

5.7651E-07

-9.1532E-09

S10

-1.3869E-01

6.8143E-02

-1.7830E-02

1.6001E-03

3.0276E-04

-1.0167E-04

1.1946E-05

-6.6401E-07

1.4543E-08

TABLE 16

Fig. 16A shows an on-axis chromatic aberration curve of an imaging lens of embodiment 8, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 16B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 8. Fig. 16C shows a distortion curve of the imaging lens of embodiment 8, which represents distortion magnitude values corresponding to different image heights. Fig. 16D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 8, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 16A to 16D, the imaging lens according to embodiment 8 can achieve good imaging quality.

In summary, examples 1 to 8 each satisfy the relationship shown in table 17.

Conditions/examples	1	2	3	4	5	6	7	8
									TTL/ImgH	1.35	1.38	1.38	1.32	1.27	1.23	1.36	1.29
Yc21/T12	4.25	3.78	4.20	3.65	3.89	4.02	3.93	4.09
									f/R3	-0.58	-0.85	-0.67	-0.61	-0.71	-0.52	-0.95	-0.69
f/(CT2+CT3)	8.44	8.29	8.67	8.94	7.65	8.48	9.41	7.94
									EPD/T23	5.56	7.30	6.21	6.81	6.57	5.94	6.27	7.32
(DT41-DT32)/ET34	0.92	0.89	1.01	0.91	1.28	1.25	1.12	1.21
									f/R9	0.28	0.27	0.25	0.26	0.41	0.25	0.18	0.44
f5/R10	-2.04	-2.02	-2.01	-2.01	-2.20	-2.00	-1.97	-2.40
									DT41/T34	2.25	1.96	2.10	1.98	2.33	2.35	2.35	1.99
|T45+SAG51|(mm)	0.05	0.21	0.14	0.12	0.00	0.21	0.14	0.10
									f/f1-f/f5	2.72	2.81	2.79	2.83	2.54	2.80	2.31	2.20
f/f2	-0.48	-0.58	-0.54	-0.55	-0.60	-0.52	0.02	-0.64

TABLE 17

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 above-described image pickup lens.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (23)

1. The imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a first lens having a positive optical power;

a second lens having optical power, an object side surface of which is concave at a paraxial region and convex at a paraxial region;

a third lens having optical power;

a fourth lens having an optical power; and

a fifth lens having a negative optical power;

the distance TTL from the object side surface of the first lens to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the camera lens satisfy that: TTL/ImgH is less than or equal to 1.4; and

a perpendicular distance Yc21 from a critical point of an object-side surface of the second lens to the optical axis and a separation distance T12 of the first lens and the second lens on the optical axis satisfy: 3.5 < Yc21/T12 < 4.5.

2. The imaging lens according to claim 1, wherein a total effective focal length f of the imaging lens and a radius of curvature R3 of an object side surface of the second lens satisfy: f/R3 is less than or equal to-0.5.

3. The imaging lens of claim 1, wherein the total effective focal length f of the imaging lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens satisfy: f/(CT2+ CT3) > 7.0.

4. The imaging lens of claim 1, wherein an entrance pupil diameter EPD of the imaging lens is spaced from the second and third lenses by a distance T23 on the optical axis that satisfies: 5.0 < EPD/T23 < 7.5.

5. The imaging lens according to claim 1, wherein a maximum effective radius DT41 of an object side surface of the fourth lens, a maximum effective radius DT32 of an image side surface of the third lens, and a distance ET34 between an edge of the third lens and an edge of the fourth lens on the optical axis satisfy: 0.8 < (DT41-DT32)/ET34 < 1.5.

6. The imaging lens according to claim 1, wherein a total effective focal length f of the imaging lens and a radius of curvature R9 of an object side surface of the fifth lens satisfy: f/R9 is more than 0 and less than or equal to 0.5.

7. The imaging lens according to claim 1, wherein an effective focal length f5 of the fifth lens and a radius of curvature R10 of an image side surface of the fifth lens satisfy: -2.5 < f5/R10 < -1.5.

8. The imaging lens according to claim 1, wherein a maximum effective radius DT41 of an object side surface of the fourth lens and a distance T34 between the third lens and the fourth lens on the optical axis satisfy: DT41/T34 is more than or equal to 1.9 and less than 2.5.

9. The imaging lens according to claim 1, wherein a distance T45 separating the fourth lens and the fifth lens on the optical axis, and a distance SAG51 on the optical axis from an intersection point of an object side surface of the fifth lens and the optical axis to an effective radius vertex of the object side surface of the fifth lens satisfy: i T45+ SAG 51I < 0.3 mm.

10. The imaging lens according to claim 1, wherein a total effective focal length f of the imaging lens, an effective focal length f1 of the first lens, and an effective focal length f5 of the fifth lens satisfy: f/f1-f/f5 is more than 2.0 and less than 3.0.

11. The imaging lens according to claim 1, wherein a total effective focal length f of the imaging lens and an effective focal length f2 of the second lens satisfy: -0.7 < f/f2 < 0.1.

12. The imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a first lens having a positive optical power;

a second lens having optical power, an object side surface of which is concave at a paraxial region and convex at a paraxial region;

a third lens having optical power;

a fourth lens having an optical power; and

a fifth lens having a negative optical power;

an entrance pupil diameter EPD of the imaging lens and a separation distance T23 on the optical axis between the second lens and the third lens satisfy: 5.0 < EPD/T23 < 7.5.

13. The imaging lens of claim 12, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the imaging lens on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the imaging lens satisfy: TTL/ImgH is less than or equal to 1.4.

14. The imaging lens of claim 12, wherein a perpendicular distance Yc21 from a critical point of an object-side surface of the second lens to the optical axis satisfies a separation distance T12 on the optical axis between the first lens and the second lens: 3.5 < Yc21/T12 < 4.5.

15. An imaging lens according to claim 12, wherein a total effective focal length f of the imaging lens and a radius of curvature R3 of an object side surface of the second lens satisfy: f/R3 is less than or equal to-0.5.

16. The imaging lens of claim 12, wherein the total effective focal length f of the imaging lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens satisfy: f/(CT2+ CT3) > 7.0.

17. The imaging lens according to claim 12, wherein a maximum effective radius DT41 of an object side surface of the fourth lens, a maximum effective radius DT32 of an image side surface of the third lens, and a distance ET34 between an edge of the third lens and an edge of the fourth lens on the optical axis satisfy: 0.8 < (DT41-DT32)/ET34 < 1.5.

18. An imaging lens according to claim 12, wherein a total effective focal length f of the imaging lens and a radius of curvature R9 of an object side surface of the fifth lens satisfy: f/R9 is more than 0 and less than or equal to 0.5.

19. The imaging lens of claim 12, wherein an effective focal length f5 of the fifth lens and a radius of curvature R10 of an image side surface of the fifth lens satisfy: -2.5 < f5/R10 < -1.5.

20. The imaging lens according to claim 12, wherein a maximum effective radius DT41 of an object side surface of the fourth lens and a distance T34 between the third lens and the fourth lens on the optical axis satisfy: DT41/T34 is more than or equal to 1.9 and less than 2.5.

21. The imaging lens according to claim 12, wherein a distance T45 separating the fourth lens and the fifth lens on the optical axis, and a distance SAG51 on the optical axis from an intersection point of an object side surface of the fifth lens and the optical axis to an effective radius vertex of the object side surface of the fifth lens satisfy: i T45+ SAG 51I < 0.3 mm.

22. The imaging lens of claim 12, wherein the total effective focal length f of the imaging lens, the effective focal length f1 of the first lens, and the effective focal length f5 of the fifth lens satisfy: f/f1-f/f5 is more than 2.0 and less than 3.0.

23. An imaging lens according to claim 12, wherein a total effective focal length f of the imaging lens and an effective focal length f2 of the second lens satisfy: -0.7 < f/f2 < 0.1.

Images