CN107422459B

CN107422459B - Camera lens

Info

Publication number: CN107422459B
Application number: CN201710820224.0A
Authority: CN
Inventors: 黄林
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2017-09-13
Filing date: 2017-09-13
Publication date: 2020-01-07
Anticipated expiration: 2037-09-13
Also published as: CN107422459A

Abstract

The application discloses camera lens, this camera lens includes by the preface from the thing side to image side along the optical axis: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens has negative focal power; the third lens has positive focal power; the second lens and the fourth lens both have focal power; the object-side surface of the third lens element is convex, the image-side surface of the fourth lens element is concave, and the radius of curvature R5 of the object-side surface of the third lens element and the radius of curvature R8 of the image-side surface of the fourth lens element satisfy 0.7 < R5/R8 < 1.2.

Description

Camera lens

Technical Field

The present application relates to an image pickup lens, and more particularly, to an image pickup lens including four lenses.

Background

With the improvement of performance and the reduction of size of a common photosensitive device such as a photosensitive coupling device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS), higher requirements are placed on the high imaging quality and miniaturization of a camera lens.

In order to meet the requirement of miniaturization, the conventional imaging lens is usually configured with an f-number Fno (total effective focal length of the lens/entrance pupil diameter of the lens) of 2.0 or more than 2.0, so as to achieve good optical performance while achieving miniaturization. However, with the continuous development of portable electronic products such as smartphones, higher requirements are put forward on the matched camera lenses, and especially under the conditions of insufficient light (such as overcast and rainy days, dusk, and the like), shaking hands, and the like, the camera lenses with the f-number Fno of 2.0 or more than 2.0 cannot meet the higher-order imaging requirements.

In particular, with the widespread proliferation of laser range finding cameras, the demand for an imaging lens suitable for a laser range finding camera is also increasing. The lens of a common distance detection camera has a large volume and cannot meet the requirement of miniaturization; the aperture of the conventional small lens is too small to be used in a distance detection camera. Therefore, the lens is required to satisfy both the requirements of large aperture and miniaturization while ensuring the imaging quality.

Disclosure of Invention

The present application provides an image pickup lens, for example, a wide-angle lens, applicable to a portable electronic product, which can solve at least or partially at least one of the above-mentioned disadvantages of the related art.

In one aspect, the present application provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens may have a negative optical power; the third lens may have a positive optical power; the second lens and the fourth lens both have focal power; the object-side surface of the third lens element can be convex, the image-side surface of the fourth lens element can be concave, and the radius of curvature R5 of the object-side surface of the third lens element and the radius of curvature R8 of the image-side surface of the fourth lens element can satisfy 0.7 < R5/R8 < 1.2.

In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the image pickup lens can satisfy-3 < f1/f < -1.5.

In one embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy 0.9 < CT3/(CT1+ CT2) < 1.5.

In one embodiment, the first lens and the second lens are separated by a distance T12 on an optical axis and a distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the camera lens can satisfy 0.1 < T12/TTL < 0.3.

In one embodiment, the distance T23 between the second lens element and the third lens element on the optical axis and the distance TTL between the object-side surface of the first lens element and the imaging surface of the imaging lens system on the optical axis may satisfy 0.1 < T23 × 10/TTL < 0.6.

In one embodiment, the length of one half of the diagonal ImgH of the effective pixel area on the imaging surface of the imaging lens and the total effective focal length f of the imaging lens can satisfy 1 < ImgH/f < 1.5.

In one embodiment, the effective half aperture DT11 of the object side surface of the first lens and the effective half aperture DT42 of the image side surface of the fourth lens can satisfy 1.3 < DT11/DT42 < 1.8.

In one embodiment, the effective half aperture DT11 of the object side surface of the first lens and the half length ImgH of the diagonal line of the effective pixel area on the imaging surface of the camera lens can satisfy 1.2 < DT11/ImgH < 1.7.

In one embodiment, the effective half aperture DT42 of the image side surface of the fourth lens and the half length ImgH of the diagonal line of the effective pixel area on the imaging surface of the camera lens can satisfy 0.7 < DT42/ImgH < 1.

In one embodiment, the effective half aperture DT32 of the image side surface of the third lens and the effective half aperture DT41 of the object side surface of the fourth lens can satisfy 0.9 < DT32/DT41 < 1.4.

In one embodiment, a distance SAG42 between an intersection point of an image-side surface of the fourth lens and the optical axis and an effective semi-aperture vertex of the image-side surface of the fourth lens on the optical axis and a central thickness CT4 of the fourth lens on the optical axis may satisfy 0 < SAG42/CT4 < 0.8.

In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens, a second lens, a third lens, and at least one subsequent lens. At least one of the object-side surface and the image-side surface of the first lens may be concave; at least one of the object-side surface and the image-side surface of the second lens may be convex; the object-side surface and the image-side surface of the third lens element can be convex, wherein the central thickness CT1 of the first lens element on the optical axis, the central thickness CT2 of the second lens element on the optical axis, and the central thickness CT3 of the third lens element on the optical axis satisfy 0.9 < CT3/(CT1+ CT2) < 1.5.

In one embodiment, the at least one subsequent lens may include a fourth lens positioned between the third lens and the image side, and an image side surface of the fourth lens may be concave.

In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens may have a negative optical power; the second lens has positive focal power or negative focal power; the third lens may have a positive optical power; the fourth lens may have a negative optical power. The length of a diagonal ImgH of an effective pixel area on an imaging surface of the camera lens and the total effective focal length f of the camera lens can meet the condition that the ImgH/f is more than 1 and less than 1.5.

In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens may have a negative optical power; the second lens has positive focal power or negative focal power; the third lens can have positive focal power, and the object side surface of the third lens is a convex surface; the fourth lens has positive focal power or negative focal power, and the image side surface of the fourth lens is a concave surface. The effective focal length f1 of the first lens and the total effective focal length f of the camera lens can satisfy-3 < f1/f < -1.5.

In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens may have a negative optical power; the second lens has positive focal power or negative focal power; the third lens can have positive focal power, and the object side surface of the third lens is a convex surface; the fourth lens has positive focal power or negative focal power, and the image side surface of the fourth lens is a concave surface. The effective half-aperture DT11 of the object side surface of the first lens and the effective half-aperture DT42 of the image side surface of the fourth lens can satisfy 1.3 < DT11/DT42 < 1.8.

In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens may have a negative optical power; the second lens has positive focal power or negative focal power; the third lens can have positive focal power, and the object side surface of the third lens is a convex surface; the fourth lens has positive focal power or negative focal power, and the image side surface of the fourth lens is a concave surface. The effective half-aperture DT11 of the object side surface of the first lens and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the camera lens can meet the requirement that DT11/ImgH is less than 1.2 and less than 1.7.

In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens may have a negative optical power; the second lens has positive focal power or negative focal power; the third lens can have positive focal power, and the object side surface of the third lens is a convex surface; the fourth lens has positive focal power or negative focal power, and the image side surface of the fourth lens is a concave surface. The distance T12 between the first lens and the second lens on the optical axis and the distance TTL between the object side surface of the first lens and the imaging surface of the camera lens on the optical axis can satisfy 0.1 < T12/TTL < 0.3.

In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens may have a negative optical power; the second lens has positive focal power or negative focal power; the third lens can have positive focal power, and the object side surface of the third lens is a convex surface; the fourth lens has positive focal power or negative focal power, and the image side surface of the fourth lens is a concave surface. The distance T23 between the second lens and the third lens on the optical axis and the distance TTL between the object side surface of the first lens and the imaging surface of the camera lens on the optical axis can satisfy 0.1 < T23 x 10/TTL < 0.6.

In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens may have a negative optical power; the second lens has positive focal power or negative focal power; the third lens can have positive focal power, and the object side surface of the third lens is a convex surface; the fourth lens has positive focal power or negative focal power, and the image side surface of the fourth lens is a concave surface. The effective half-aperture DT32 of the image side surface of the third lens and the effective half-aperture DT41 of the object side surface of the fourth lens can satisfy 0.9 < DT32/DT41 < 1.4.

In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens may have a negative optical power; the second lens has positive focal power or negative focal power; the third lens can have positive focal power, and the object side surface of the third lens is a convex surface; the fourth lens has positive focal power or negative focal power, and the image side surface of the fourth lens is a concave surface. The effective half-aperture DT42 of the image side surface of the fourth lens and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the camera lens can meet the requirement that DT42/ImgH is less than 0.7 and less than 1.

In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens may have a negative optical power; the second lens has positive focal power or negative focal power; the third lens can have positive focal power, and the object side surface of the third lens is a convex surface; the fourth lens has positive focal power or negative focal power, and the image side surface of the fourth lens is a concave surface. The distance SAG42 between the intersection point of the image side surface of the fourth lens and the optical axis and the effective semi-caliber vertex of the image side surface of the fourth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis can satisfy 0 & lt SAG42/CT4 & lt 0.8.

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, the pick-up lens has at least one beneficial effect of miniaturization, large aperture, high brightness and the like while realizing good imaging quality

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

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 on-axis chromatic aberration curve, an astigmatism curve, a magnification chromatic aberration curve, and a relative illuminance 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 on-axis chromatic aberration curve, an astigmatism curve, a magnification chromatic aberration curve, and a relative illuminance 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 on-axis chromatic aberration curve, an astigmatism curve, a magnification chromatic aberration curve, and a relative illuminance 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 magnification chromatic aberration curve, and a relative illuminance 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 magnification chromatic aberration curve, and a relative illuminance 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;

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

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, and the surface of each lens closest to the image plane is called the image side surface.

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 includes, for example, four lenses having optical power, i.e., a first lens, a second lens, a third lens, and a fourth lens. The four lenses are arranged in order from the object side to the image side along the optical axis. The camera lens can further comprise a photosensitive element arranged on an imaging surface.

The first lens may have a negative optical power; the second lens has positive focal power or negative focal power; the third lens may have a positive optical power; the fourth lens has positive power or negative power.

Alternatively, the fourth lens may have a negative power.

The effective focal length f1 of the first lens and the total effective focal length f of the camera lens can satisfy-3 < f1/f < 1.5, more specifically, f1 and f further satisfy-2.62 < f1/f < 1.86. The focal power of the first lens is reasonably configured, so that the field angle of the lens can be effectively enlarged.

The separation distance T12 between the first lens and the second lens on the optical axis and the total optical length TTL of the imaging lens (i.e., the on-axis distance from the object side surface of the first lens to the imaging surface of the imaging lens) can satisfy 0.1 < T12/TTL < 0.3, and more specifically, T12 and TTL can further satisfy 0.15 < T12/TTL < 0.22. Through the reasonable configuration of T12 and TTL, the relative illumination and the diaphragm effect of the lens can be improved while a large wide angle is realized.

The distance T23 between the second lens and the third lens on the optical axis and the total optical length TTL of the camera lens can satisfy 0.1 < T23 x 10/TTL < 0.6, and more specifically, T23 and TTL can further satisfy 0.28 < T23 x 10/TTL < 0.51. The T23 and the TTL are reasonably configured, so that the resolution power of the lens is improved; meanwhile, the lens is favorable for ensuring that the lens has shorter total optical length, and the miniaturization of the lens is realized.

The central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis can satisfy 0.9 < CT3/(CT1+ CT2) < 1.5, more specifically, CT1, CT2 and CT3 can further satisfy 1.01 < CT3/(CT1+ CT2) < 1.49. The center thicknesses of the first lens, the second lens and the third lens are reasonably configured, and the miniaturization effect is favorably realized.

The object-side surface of the third lens element can be convex, and the image-side surface of the fourth lens element can be concave. The radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R8 of the image-side surface of the fourth lens can satisfy 0.7 < R5/R8 < 1.2, and more specifically, R5 and R8 can further satisfy 0.80 ≦ R5/R8 ≦ 1.07. The curvature radius of each surface of the third lens and the curvature radius of each surface of the fourth lens are reasonably controlled, correction of various aberrations is facilitated, and imaging quality of the lens is improved.

Optionally, at least one of the object-side surface and the image-side surface of the first lens may be concave; at least one of the object-side surface and the image-side surface of the second lens may be convex; the object side surface of the third lens can be a convex surface, and the image side surface of the third lens can be a convex surface; the object-side surface of the fourth lens element can be convex, and the image-side surface can be concave.

The effective semi-aperture DT11 of the object side surface of the first lens and the effective semi-aperture DT42 of the image side surface of the fourth lens can satisfy 1.3 < DT11/DT42 < 1.8, more specifically, DT11 and DT42 further satisfy 1.42 < DT11/DT42 < 1.69, so that the miniaturization effect is realized.

The effective half aperture DT11 of the object side surface of the first lens and the half length ImgH of the diagonal line of the effective pixel area on the imaging surface of the camera lens can satisfy 1.2 < DT11/ImgH < 1.7, more specifically, DT11 and ImgH can further satisfy 1.33 < DT11/ImgH < 1.54, so as to realize the miniaturization effect.

The effective half aperture DT42 of the image side surface of the fourth lens and the half length ImgH of the diagonal line of the effective pixel area on the imaging surface of the camera lens can satisfy 0.7 < DT42/ImgH < 1, more specifically, DT42 and ImgH can further satisfy 0.89 < DT42/ImgH < 0.98, so as to improve the relative illumination of the lens.

The effective half-aperture DT32 of the image side surface of the third lens and the effective half-aperture DT41 of the object side surface of the fourth lens can satisfy 0.9 < DT32/DT41 < 1.4, and more specifically, DT32 and DT41 further satisfy 1.00 < DT32/DT41 < 1.33, so that the resolving power of the lens is improved.

The distance SAG42 on the optical axis between the intersection point of the image-side surface of the fourth lens and the optical axis and the effective semi-aperture vertex of the image-side surface of the fourth lens and the central thickness CT4 of the fourth lens on the optical axis can satisfy 0 < SAG42/CT4 < 0.8, and more specifically, SAG42 and CT4 can further satisfy 0.31 < SAG42/CT4 < 0.64. SAG42 and CT4 are reasonably arranged, distortion is reduced, and imaging quality of the lens is improved.

The half of the diagonal length of an effective pixel area on the imaging surface of the camera lens, namely ImgH/f, and the total effective focal length f of the camera lens can meet the condition that 1 is more than 1 and less than 1.5, and more specifically, ImgH and f further meet the condition that 1.17 is more than or equal to ImgH/f and less than or equal to 1.34.

In an exemplary embodiment, the camera lens may further be provided with at least one diaphragm to improve the imaging quality of the lens. The diaphragm may be disposed at any position between the object side and the image side as required.

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, four 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, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the camera lens is more beneficial to production and processing and can be suitable for portable electronic products. Meanwhile, the camera lens with the configuration has the beneficial effects of large aperture, high brightness, high imaging quality and the like, and can be well applied to the fields of distance detection 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. 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.

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 four lenses are exemplified in the embodiment, the imaging lens is not limited to including four 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 the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an image plane S11. The imaging lens may further include a photosensitive element provided on the imaging surface S11.

The first lens element L1 has negative power, the object-side surface S1 is concave, the image-side surface S2 is concave, and both the object-side surface S1 and the image-side surface S2 of the first lens element L1 are aspheric.

The second lens L2 has positive power, the object-side surface S3 is concave, the image-side surface S4 is convex, and both the object-side surface S3 and the image-side surface S4 of the second lens L2 are aspheric.

The third lens element L3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6, and both the object-side surface S5 and the image-side surface S6 of the third lens element L3 are aspheric.

The fourth lens element L4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are aspheric.

Alternatively, the imaging lens may further include a filter L5 having an object side surface S9 and an image side surface S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

Alternatively, a stop STO may be provided between the first lens L1 and the second lens L2 to improve the imaging quality.

Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 1, where the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 1

As can be seen from table 1, the radius of curvature R5 of the object-side surface S5 of the third lens L3 and the radius of curvature R8 of the image-side surface S8 of the fourth lens L4 satisfy R5/R8 of 1.03; the central thickness CT1 of the first lens L1 on the optical axis, the central thickness CT2 of the second lens L2 on the optical axis, and the central thickness CT3 of the third lens L3 on the optical axis satisfy CT3/(CT1+ CT2) ═ 1.24.

In embodiment 1, each lens may be an aspherical lens, and each aspherical surface type x is defined by the following 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 the conic coefficient (given in table 1); 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 S8 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄And A₁₆。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.0642E-02

-7.2951E-03

1.2109E-03

-1.2987E-04

8.2620E-06

-2.7182E-07

3.1667E-09

S2

1.1256E-01

-7.4553E-02

1.1962E-01

-1.1722E-01

6.4425E-02

-1.7817E-02

1.8859E-03

S3

-9.6298E-02

3.2387E-01

-1.1075E+00

2.0286E+00

-2.1221E+00

1.1737E+00

-2.6935E-01

S4

-1.4363E-01

1.1071E-01

-1.1036E-01

7.7104E-02

-3.4727E-02

8.7770E-03

-9.6168E-04

S5

8.5990E-03

-7.0148E-04

-1.1257E-03

5.2453E-04

-1.1488E-04

1.3396E-05

-6.6236E-07

S6

8.6813E-03

-3.2359E-03

-2.5427E-03

1.2039E-03

-2.2194E-04

2.0108E-05

-7.5337E-07

S7

-7.4705E-03

-4.1334E-03

-6.6334E-04

-1.7190E-05

-3.6760E-06

2.0842E-05

-3.0230E-06

S8

-1.5401E-02

1.3561E-02

-8.0973E-03

2.1632E-03

-2.8327E-04

1.6408E-05

-2.8401E-07

TABLE 2

Table 3 below gives the total effective focal length f of the imaging lens, the effective focal lengths f1 to f4 of the respective lenses, the total optical length TTL of the imaging lens (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the imaging surface S11), and half ImgH of the diagonal length of the effective pixel region on the imaging surface S11 of the imaging lens in embodiment 1.

TABLE 3

The spacing distance T12 between the first lens L1 and the second lens L2 on the optical axis and the total optical length TTL of the photographic lens satisfy that T12/TTL is 0.15; the spacing distance T23 between the second lens L2 and the third lens L3 on the optical axis and the total optical length TTL of the photographic lens meet the condition that T23 x 10/TTL is 0.37; f1/f is equal to-2.11 between the effective focal length f1 of the first lens L1 and the total effective focal length f of the imaging lens; ImgH/f is 1.26 between half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the imaging lens and the total effective focal length f of the imaging lens.

In embodiment 1, DT11/DT42 is 1.43 between the effective half-aperture DT11 of the object-side surface S1 of the first lens L1 and the effective half-aperture DT42 of the image-side surface S8 of the fourth lens L4; the effective half-aperture DT11 of the object side surface S1 of the first lens L1 and the half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the camera lens meet the condition that DT11/ImgH is 1.33; the effective half-aperture DT42 of the image side surface S8 of the fourth lens L4 and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S11 satisfy that DT42/ImgH is 0.93; the effective half-aperture DT32 of the image side S6 of the third lens L3 and the effective half-aperture DT41 of the object side S7 of the fourth lens L4 meet the requirement that DT32/DT41 is 1.33; the axial distance between the intersection point of the image side surface S8 of the fourth lens L4 and the optical axis and the effective semi-aperture vertex of the image side surface S8 of the fourth lens L4, namely SAG42, and the central thickness CT4 of the fourth lens L4 on the optical axis satisfy 0.43 of SAG42/CT 4.

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 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. Fig. 2D shows a relative illuminance curve of the imaging lens of embodiment 1, which represents relative illuminance corresponding to different angles of view. 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 the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an image plane S11. The imaging lens may further include a photosensitive element provided on the imaging surface S11.

The second lens element L2 has positive power, the object-side surface S3 is convex, the image-side surface S4 is convex, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are aspheric.

Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 2, where the unit of the radius of curvature and the thickness are both millimeters (mm). Table 5 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 6 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f4 of the respective lenses, the total optical length TTL of the imaging lens, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the imaging lens in embodiment 2.

TABLE 4

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.2289E-02

-4.2682E-03

5.2154E-04

-3.2167E-05

-6.5861E-09

1.0613E-07

-3.8767E-09

S2

8.3413E-02

-4.6106E-02

6.1582E-02

-4.9594E-02

2.2677E-02

-5.1310E-03

4.3856E-04

S3

-7.7210E-02

2.2969E-01

-6.3031E-01

9.5376E-01

-8.3010E-01

3.8396E-01

-7.3574E-02

S4

-1.0983E-01

6.3218E-02

-5.1160E-02

2.9146E-02

-1.0614E-02

2.1446E-03

-1.8642E-04

S5

6.3913E-03

7.3420E-04

-1.6498E-03

6.9869E-04

-1.5284E-04

1.7182E-05

-7.5579E-07

S6

7.3652E-03

-4.1759E-03

3.8963E-04

-1.5330E-04

6.4190E-05

-1.0426E-05

6.1475E-07

S7

2.6001E-05

-1.1399E-02

4.9366E-03

-1.7443E-03

3.3698E-04

-3.2219E-05

1.2035E-06

S8

-2.1226E-02

1.1221E-02

-3.7164E-03

7.4355E-04

-8.1779E-05

3.3695E-06

1.1787E-08

TABLE 5

TABLE 6

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 chromatic aberration of magnification curve of the imaging lens of embodiment 2, which represents a deviation of different image heights on the imaging plane after light passes through the lens. Fig. 4D shows a relative illuminance curve of the imaging lens of example 2, which represents relative illuminance corresponding to different angles of view. 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 the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an image plane S11. The imaging lens may further include a photosensitive element provided on the imaging surface S11.

The second lens element L2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are aspheric.

Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 3, where the unit of the radius of curvature and the thickness are both millimeters (mm). Table 8 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 9 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f4 of the respective lenses, the total optical length TTL of the imaging lens, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the imaging lens in embodiment 3.

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.1698E-02

-4.8541E-03

8.0127E-04

-8.3661E-05

4.8322E-06

-1.2574E-07

6.0448E-10

S2

5.4816E-02

-4.6444E-02

6.1798E-02

-4.9551E-02

2.2696E-02

-5.1364E-03

4.2446E-04

S3

-6.3615E-02

1.1774E-01

-3.1590E-01

4.3047E-01

-3.3423E-01

1.3046E-01

-1.9150E-02

S4

-1.0435E-01

4.3045E-02

-2.6015E-02

4.6346E-03

3.1642E-03

-2.0783E-03

3.5438E-04

S5

6.3587E-03

2.1999E-03

-2.5964E-03

1.0024E-03

-2.1783E-04

2.6311E-05

-1.2972E-06

S6

2.8861E-03

-6.1943E-03

6.0177E-03

-3.2723E-03

8.4682E-04

-1.0625E-04

5.3215E-06

S7

7.3554E-03

-1.4720E-02

6.8602E-03

-1.9286E-03

1.3716E-04

2.3213E-05

-2.8750E-06

S8

-1.4432E-02

1.6791E-03

4.2821E-03

-2.7722E-03

7.1596E-04

-8.6196E-05

3.9515E-06

TABLE 8

TABLE 9

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 chromatic aberration of magnification curve of the imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the lens. Fig. 6D shows a relative illuminance curve of the imaging lens of example 3, which represents relative illuminance corresponding to different angles of view. 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 the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an image plane S11. The imaging lens may further include a photosensitive element provided on the imaging surface S11.

The first lens element L1 has negative power, the object-side surface S1 is convex, the image-side surface S2 is concave, and both the object-side surface S1 and the image-side surface S2 of the first lens element L1 are aspheric.

Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 4, where the unit of the radius of curvature and the thickness are both millimeters (mm). Table 11 shows high-order term coefficients that can be used for each aspherical mirror surface in embodiment 4, wherein each aspherical mirror surface type can be defined by the formula (1) given in embodiment 1 above. Table 12 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f4 of the respective lenses, the total optical length TTL of the imaging lens, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the imaging lens in embodiment 4.

Watch 10

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

5.3925E-03

1.3960E-04

-2.1237E-04

4.3406E-05

-4.3647E-06

2.2423E-07

-4.7155E-09

S2

-6.3116E-04

2.9146E-02

-4.7154E-02

4.8565E-02

-2.8868E-02

9.0888E-03

-1.1811E-03

S3

-1.0530E-01

3.6547E-01

-1.1996E+00

2.1243E+00

-2.1431E+00

1.1400E+00

-2.4991E-01

S4

-1.5961E-01

1.1440E-01

-1.1717E-01

8.3431E-02

-3.8259E-02

9.8471E-03

-1.0958E-03

S5

1.2268E-02

-9.1803E-03

3.7129E-03

-1.5761E-03

4.4957E-04

-6.1599E-05

3.1724E-06

S6

5.0505E-03

-2.7187E-03

-3.7048E-03

1.8038E-03

-3.6432E-04

3.8496E-05

-1.7088E-06

S7

-1.2627E-04

-1.0610E-02

3.1536E-03

-2.0136E-03

6.3007E-04

-6.8055E-05

9.4689E-07

S8

1.9575E-03

7.6049E-04

-1.7800E-03

2.6516E-05

1.5704E-04

-3.2119E-05

1.8879E-06

TABLE 11

TABLE 12

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 chromatic aberration of magnification curve of the imaging lens of embodiment 4, which represents a deviation of different image heights on the imaging plane after light passes through the lens. Fig. 8D shows a relative illuminance curve of the imaging lens of example 4, which indicates relative illuminance corresponding to different angles of view. 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 the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an image plane S11. The imaging lens may further include a photosensitive element provided on the imaging surface S11.

Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 5, where the unit of the radius of curvature and the thickness are both millimeters (mm). Table 14 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 15 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f4 of the respective lenses, the total optical length TTL of the imaging lens, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the imaging lens in embodiment 5.

Watch 13

TABLE 14

Watch 15

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 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. Fig. 10D shows a relative illuminance curve of the imaging lens of example 5, which shows relative illuminance corresponding to different angles of view. 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 the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an image plane S11. The imaging lens may further include a photosensitive element provided on the imaging surface S11.

Alternatively, a stop STO may be provided between the second lens L2 and the third lens L3 to improve the imaging quality.

Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 6, where the unit of the radius of curvature and the thickness are both millimeters (mm). Table 17 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 18 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f4 of the respective lenses, the total optical length TTL of the imaging lens, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the imaging lens in embodiment 6.

TABLE 16

TABLE 17

Watch 18

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 chromatic aberration of magnification curve of the imaging lens of embodiment 6, which represents a deviation of different image heights on the imaging plane after light passes through the lens. Fig. 12D shows a relative illuminance curve of the imaging lens of example 6, which shows relative illuminance corresponding to different angles of view. As can be seen from fig. 12A to 12D, the imaging lens according to embodiment 6 can achieve good imaging quality.

In summary, examples 1 to 6 each satisfy the relationship shown in table 19 below.

Conditional expression (A) example	1	2	3	4	5	6
							f1/f	-2.11	-2.16	-2.21	-1.86	-2.14	-2.62
R5/R8	1.03	0.94	1.00	0.80	1.07	1.03
							CT3/(CT1+CT2)	1.24	1.04	1.49	1.04	1.01	1.26
DT11/DT42	1.43	1.55	1.50	1.42	1.66	1.69
							DT11/ImgH	1.33	1.39	1.38	1.39	1.49	1.54
T12/TTL	0.15	0.19	0.21	0.19	0.22	0.17
							T23*10/TTL	0.37	0.28	0.28	0.30	0.30	0.51
DT32/DT41	1.33	1.07	1.08	1.05	1.11	1.00
							DT42/ImgH	0.93	0.90	0.91	0.98	0.89	0.91
SAG42/CT4	0.43	0.41	0.41	0.31	0.64	0.46
							ImgH/f	1.26	1.26	1.25	1.34	1.26	1.17

Watch 19

The present application also provides an image pickup apparatus, wherein the electronic photosensitive element may be a photosensitive coupling element (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). The camera device can be a stand-alone camera device such as a digital camera, and can also be a camera module integrated on a mobile electronic device such as a mobile phone and a tablet computer. The image pickup apparatus is equipped with the image pickup lens described above.

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

1. The image pickup lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, and a fourth lens,

the first lens has a negative optical power;

the third lens has positive optical power;

the second lens and the fourth lens each have optical power;

the object side surface of the third lens is convex, the image side surface of the fourth lens is concave, the curvature radius R5 of the object side surface of the third lens and the curvature radius R8 of the image side surface of the fourth lens meet the condition that R5/R8 is more than 0.7 and less than 1.2,

the effective semi-aperture DT11 of the object side surface of the first lens and the effective semi-aperture DT42 of the image side surface of the fourth lens meet 1.3 < DT11/DT42 < 1.8, an

At least one of the mirror surfaces of the first lens, the second lens, the third lens, and the fourth lens is an aspherical mirror surface.

2. The imaging lens of claim 1, wherein the effective focal length f1 of the first lens and the total effective focal length f of the imaging lens satisfy-3 < f1/f < -1.5.

3. The imaging lens of claim 1, wherein a center thickness CT1 of the first lens element on the optical axis, a center thickness CT2 of the second lens element on the optical axis, and a center thickness CT3 of the third lens element on the optical axis satisfy 0.9 < CT3/(CT1+ CT2) < 1.5.

4. The imaging lens of claim 1, wherein the first lens element and the second lens element are spaced apart on the optical axis by a distance T12, and a distance TTL on the optical axis from the object-side surface of the first lens element to the imaging surface of the imaging lens element satisfies 0.1 < T12/TTL < 0.3.

5. The imaging lens system of claim 1, wherein a distance T23 between the second lens element and the third lens element on the optical axis and a distance TTL between the object-side surface of the first lens element and the imaging surface of the imaging lens system on the optical axis satisfy 0.1 < T23 x 10/TTL < 0.6.

6. The imaging lens according to any one of claims 1 to 5, wherein a length of a diagonal half of an effective pixel region on an imaging surface of the imaging lens, ImgH, and a total effective focal length f of the imaging lens satisfy 1 < ImgH/f < 1.5.

7. The imaging lens of claim 1, wherein an effective half aperture DT11 of the object side surface of the first lens and a half ImgH of a diagonal length of an effective pixel region on the imaging surface of the imaging lens satisfy 1.2 < DT11/ImgH < 1.7.

8. The imaging lens system according to claim 1, wherein an effective half aperture DT42 of the image side surface of the fourth lens element and a half ImgH of a diagonal length ImgH of an effective pixel region on the imaging surface of the imaging lens satisfy 0.7 < DT42/ImgH < 1.

9. The imaging lens system according to claim 1, wherein an effective half-aperture DT32 of the image-side surface of the third lens and an effective half-aperture DT41 of the object-side surface of the fourth lens satisfy 0.9 < DT32/DT41 < 1.4.

10. The imaging lens of claim 1, wherein a distance SAG42 on the optical axis between an intersection point of an image-side surface of the fourth lens and the optical axis and an effective semi-aperture vertex of the image-side surface of the fourth lens and a central thickness CT4 on the optical axis of the fourth lens satisfy 0 < SAG42/CT4 < 0.8.

11. The image pickup lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, and a fourth lens,

at least one of the object side surface and the image side surface of the first lens is a concave surface;

at least one of the object side surface and the image side surface of the second lens is a convex surface;

the object side surface and the image side surface of the third lens are convex surfaces,

wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy 0.9 < CT3/(CT1+ CT2) < 1.5,

a radius of curvature R5 of the object-side surface of the third lens element and a radius of curvature R8 of the image-side surface of the fourth lens element satisfy 0.7 < R5/R8 < 1.2, and

12. The imaging lens of claim 11, wherein the first lens has a negative power, and an effective focal length f1 of the first lens and a total effective focal length f of the imaging lens satisfy-3 < f1/f < -1.5.

13. The imaging lens of claim 11, wherein the first lens element and the second lens element are spaced apart on the optical axis by a distance T12, and a distance TTL on the optical axis from the object-side surface of the first lens element to the imaging surface of the imaging lens element satisfies 0.1 < T12/TTL < 0.3.

14. The image-capturing lens system of claim 11, wherein the distance T23 between the second lens element and the third lens element on the optical axis and the distance TTL between the object-side surface of the first lens element and the image plane of the image-capturing lens system on the optical axis satisfy 0.1 < T23 x 10/TTL < 0.6.

15. The imaging lens assembly according to claim 11, wherein an image side surface of the fourth lens is a concave surface.

16. The imaging lens system according to claim 15, wherein an effective half-aperture DT11 of the object-side surface of the first lens and an effective half-aperture DT42 of the image-side surface of the fourth lens satisfy 1.3 < DT11/DT42 < 1.8.

17. The imaging lens of claim 16, wherein an effective half aperture DT11 of the object side surface of the first lens and a half ImgH of a diagonal length of an effective pixel region on an imaging surface of the imaging lens satisfy 1.2 < DT11/ImgH < 1.7.

18. The imaging lens system according to claim 16, wherein an effective half aperture DT42 of the image side surface of the fourth lens element and a half ImgH of a diagonal length ImgH of an effective pixel region on the imaging surface of the imaging lens satisfy 0.7 < DT42/ImgH < 1.

19. The imaging lens system according to claim 15, wherein an effective half-aperture DT32 of the image-side surface of the third lens and an effective half-aperture DT41 of the object-side surface of the fourth lens satisfy 0.9 < DT32/DT41 < 1.4.

20. The imaging lens of claim 15, wherein a distance SAG42 on the optical axis between an intersection point of the image-side surface of the fourth lens and the optical axis and an effective semi-aperture vertex of the image-side surface of the fourth lens and a central thickness CT4 on the optical axis of the fourth lens satisfy 0 < SAG42/CT4 < 0.8.

21. An imaging lens according to any one of claims 11 to 20, wherein a length of a diagonal half ImgH of an effective pixel region on an imaging surface of the imaging lens and a total effective focal length f of the imaging lens satisfy 1 < ImgH/f < 1.5.

22. The image pickup lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, and a fourth lens,

the first lens has a negative optical power;

the second lens has positive focal power or negative focal power;

the third lens has positive optical power;

the fourth lens has a negative optical power;

half of the diagonal length ImgH of an effective pixel area on the imaging surface of the camera lens and the total effective focal length f of the camera lens meet the condition that the ImgH/f is more than 1 and less than 1.5,

23. The imaging lens assembly of claim 22, wherein the object side surface of the third lens element is convex and the image side surface of the fourth lens element is concave.

24. The imaging lens of claim 22, wherein an effective half aperture DT11 of the object side surface of the first lens and a half ImgH of a diagonal length of an effective pixel region on the imaging surface of the imaging lens satisfy 1.2 < DT11/ImgH < 1.7.

25. An imaging lens system according to claim 22 or 24, wherein an effective half aperture DT42 of the image side surface of the fourth lens element and a half ImgH of a diagonal length ImgH of an effective pixel region on an imaging surface of the imaging lens system satisfy 0.7 < DT42/ImgH < 1.

26. An imaging lens system according to claim 25, wherein an effective half-aperture DT11 of the object-side surface of the first lens element and an effective half-aperture DT42 of the image-side surface of the fourth lens element satisfy 1.3 < DT11/DT42 < 1.8.

27. An imaging lens system according to claim 22, wherein an effective half-aperture ratio DT32 of the image-side surface of the third lens element and an effective half-aperture ratio DT41 of the object-side surface of the fourth lens element satisfy 0.9 < DT32/DT41 < 1.4.

28. The imaging lens of claim 23, wherein a distance SAG42 on the optical axis between an intersection point of the image-side surface of the fourth lens and the optical axis and an effective semi-aperture vertex of the image-side surface of the fourth lens and a central thickness CT4 on the optical axis of the fourth lens satisfy 0 < SAG42/CT4 < 0.8.

29. The imaging lens of claim 22, wherein the first lens has a negative power, and an effective focal length f1 of the first lens and a total effective focal length f of the imaging lens satisfy-3 < f1/f < -1.5.

30. An image pickup lens as recited in claim 22 or 29, wherein the first lens element and the second lens element are spaced apart on the optical axis by a distance T12, and a distance TTL on the optical axis from the object side surface of the first lens element to the image plane of the image pickup lens satisfies 0.1 < T12/TTL < 0.3.

31. The image capture lens of claim 30, wherein the distance T23 separating the second and third lenses on the optical axis and the distance TTL between the object-side surface of the first lens and the image capture lens surface on the optical axis satisfy 0.1 < T23 x 10/TTL < 0.6.

32. The imaging lens assembly of claim 31, wherein a center thickness CT1 of the first lens element on the optical axis, a center thickness CT2 of the second lens element on the optical axis, and a center thickness CT3 of the third lens element on the optical axis satisfy 0.9 < CT3/(CT1+ CT2) < 1.5.