CN214751061U

CN214751061U - Image lens

Info

Publication number: CN214751061U
Application number: CN202120951966.9U
Authority: CN
Inventors: 崔甲臣; 黄林; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2021-11-16
Anticipated expiration: 2031-05-06

Abstract

The utility model discloses an image camera lens, include: at least 1 diaphragm and 4 lenses; a first lens having a negative refractive power, an object side surface of which is a concave surface; the image side surface of the second lens is a convex surface; a third lens element having a concave image-side surface; a fourth lens having a positive refractive power, an object-side surface of which is convex; the distance TTL from the object side surface of the first lens of the image lens to the image surface on the optical axis, the half ImgH of the diagonal length of the effective pixel area on the imaging surface and the half Semi-FOV of the maximum field angle of the image lens meet the following requirements: 2.2< TTL/ImgH × tan (Semi-FOV) < 3.1; the effective focal length f of the image lens, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens meet the following conditions: 0.65< f/(R3-R4) < 0.75. The utility model provides an image camera lens, the biggest field angle of image camera lens is promoted to bigger degree on the basis that keeps the image quality to promote, satisfies the demand of current cell-phone market to wide-angle camera lens.

Description

Image lens

Technical Field

The utility model belongs to the optical imaging field especially relates to an image camera lens including four lens.

Background

The requirements of the mobile phone market on the imaging quality of the mobile phone lens are higher and higher, the number of camera modules is also gradually increased for obtaining more camera functions and better adapting to the market, and multi-camera mobile phones with three cameras, four cameras and the like become trends. Many mobile phones on the market currently carry a wide-angle lens as a sub-camera, so that the mobile phones have a more excellent photographing function, and therefore how to increase the maximum field angle of the image lens to a greater extent on the basis of keeping the image quality improved is a main research direction of the wide-angle lens currently. Therefore, a 4P lens with these features is needed to meet the demand of the current market for wide-angle lenses.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an image camera lens that four lens are constituteed, this image camera lens the biggest field angle that the bigger degree ground promoted image camera lens on the basis that keeps the image quality to promote satisfies the demand of current cell-phone market to wide-angle camera lens.

An aspect of the utility model provides an image camera lens, include: at least 1 diaphragm and 4 lenses; a first lens having a negative refractive power, an object side surface of which is a concave surface; the image side surface of the second lens is a convex surface; a third lens element having a concave image-side surface; and a fourth lens having a positive refractive power, an object-side surface of which is convex.

The distance TTL from the object side surface of the first lens of the image lens to the image surface on the optical axis, the half ImgH of the diagonal length of the effective pixel area on the imaging surface and the half Semi-FOV of the maximum field angle of the image lens meet the following requirements: 2.2< TTL/ImgH × tan (Semi-FOV) < 3.1.

According to the utility model discloses an embodiment, the effective focal length f of image lens, the radius of curvature R3 of second lens object side and the radius of curvature R4 of second lens image side satisfy: 0.65< f/(R3-R4) < 0.75.

According to the utility model discloses an embodiment, the biggest field angle FOV of image lens satisfies: 100 ° < FOV <115 °.

According to an embodiment of the present invention, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: 1.7< | R1/R6| < 2.3.

According to an embodiment of the present invention, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 0.1< (f1+ f2)/(f1-f2) < 0.6.

According to an embodiment of the present invention, the central thickness CT4 of the fourth lens on the optical axis and the effective focal length f4 of the fourth lens satisfy: -4.5< ln (CT4/f4) < -2.2.

According to an embodiment of the present invention, the sum Σ CT of the center thicknesses of all lenses on the optical axis and the sum Σ Vd of all lens dispersion coefficients satisfy: 0.65mm <50 x Σ CT/Σ Vd <0.75 mm.

According to an embodiment of the present invention, the effective semi-bore DT41 of the object side surface of the fourth lens and the effective semi-bore DT21 of the object side surface of the second lens satisfy: 2.3< DT41/DT21< 3.3.

According to the utility model discloses an embodiment, the effective focal length f of image lens f, the effective focal length f3 of third lens and the effective focal length f4 of fourth lens satisfy: (f + | f3|)/f4< 0.6.

According to the utility model discloses an embodiment, diaphragm to fourth lens image side face distance SD on the optical axis satisfies with the entrance pupil diameter EPD of image camera lens among the image camera lens: 2.8< SD/EPD < 3.3.

According to an embodiment of the present invention, half ImgH of the diagonal length of the effective pixel area on the imaging plane and half Semi-FOV of the maximum field angle of the image lens satisfy: 1mm < ImgH/tan (Semi-FOV) ^2<1.5 mm.

Another aspect of the utility model provides an image camera lens, include: at least 1 diaphragm and 4 lenses; the first lens with negative focal power, the object side surface of the first lens is a concave surface, and the object side surface of the first lens is provided with at least one point of inflection; the second lens with positive focal power has a convex object-side surface and a convex image-side surface; a third lens element having a concave image-side surface; and a fourth lens having positive optical power.

Wherein, each lens is independent, and there is air space on the optical axis between each lens; the effective focal length f of the image lens, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens meet the following requirements: 0.65< f/(R3-R4) < 0.75.

The utility model has the advantages that:

the utility model provides an image camera lens includes multi-disc lens, like first lens to fourth lens. The image lens can improve the maximum field angle of the image lens to a greater extent on the basis of keeping the image quality improved, and the requirement of the current mobile phone market on the wide-angle lens is met.

Drawings

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

Fig. 1 is a schematic view of a lens assembly according to an embodiment 1 of the present invention;

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

fig. 3 is a schematic view of a lens assembly according to embodiment 2 of the present invention;

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

fig. 5 is a schematic view of a lens assembly according to embodiment 3 of the present invention;

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

fig. 7 is a schematic view of a lens assembly according to embodiment 4 of the present invention;

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

fig. 9 is a schematic view of a lens assembly according to embodiment 5 of the present invention;

fig. 10a to 10c are a distortion curve, an axial chromatic aberration curve, and an astigmatism curve, respectively, according to embodiment 5 of the present invention;

fig. 11 is a schematic view of a lens assembly according to embodiment 6 of the present invention;

fig. 12a to 12c are a distortion curve, an axial chromatic aberration curve, and an astigmatism curve, respectively, according to embodiment 6 of the present invention;

fig. 13 is a schematic view of a lens assembly according to embodiment 7 of the present invention;

fig. 14a to 14c respectively show a distortion curve, an axial chromatic aberration curve, and an astigmatism curve of an image lens system according to embodiment 7 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present invention.

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

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

In the description of the present invention, the paraxial region means a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

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

Exemplary embodiments

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

In the present exemplary embodiment, the first lens has a negative power, the object side surface of which is concave, the object side surface having at least one inflection point; the second lens has positive focal power, and the object side surface of the second lens is a convex surface; the third lens can have positive focal power or negative focal power, and the image side surface of the third lens is a concave surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface. At least 2 lenses are made of plastic. The first lens with negative focal power and the concave object-side surface and the second lens with positive focal power and the convex image-side surface play a role in light convergence, and the focal length can be improved to the maximum extent on the premise of keeping good convergence of light by matching with the rear 2 lenses. Meanwhile, the third lens with the concave image side surface and the fourth lens with positive focal power are carried, so that aberration can be effectively reduced.

In the present exemplary embodiment, the distance TTL on the optical axis from the object-side surface of the first lens of the image lens to the image plane, ImgH which is half the diagonal length of the effective pixel area on the image plane, and Semi-FOV which is half the maximum field angle of the image lens satisfy the conditional expressions: 2.2< TTL/ImgH × tan (Semi-FOV) < 3.1. The lens is controlled to be in a proper range of 2.2< TTL/ImgH × tan (Semi-FOV) <3.1, so that the lens has a wider imaging surface, and the application range of the lens is widened. More specifically, TTL, ImgH and Semi-FOV satisfy: 2.4< TTL/ImgH × tan (Semi-FOV) <3, for example, 2.43 ≦ TTL/ImgH × tan (Semi-FOV) ≦ 2.96.

In the present exemplary embodiment, the effective focal length f of the image lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy the following conditional expression: 0.65< f/(R3-R4) < 0.75. The ratio of the effective focal length to the difference value between the curvature radius of the object side surface and the curvature radius of the image side surface of the second lens is limited within a reasonable range, so that the astigmatism of the system can be effectively controlled, and the imaging quality of an off-axis field of view can be improved. More specifically, f, R3 and R4 satisfy: 0.66< f/(R3-R4) <0.75, for example, 0.67. ltoreq. f/(R3-R4). ltoreq.0.74.

In the present exemplary embodiment, the maximum field angle FOV of the image lens satisfies the conditional expression: 100 ° < FOV <115 °. By adjusting the FOV within a proper range, the imaging height of the system can be improved, and meanwhile, the overlarge aberration of the marginal field of view is avoided, so that the characteristics of wide imaging range and high imaging quality of the system can be better kept. Meanwhile, the full field angle of the imaging lens is increased, and more shooting space can be obtained during long-range shooting. More specifically, the FOV satisfies: 106 < FOV <112, e.g., 106.16 < FOV < 111.3.

In the present exemplary embodiment, the conditional expression that the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R6 of the image-side surface of the third lens satisfy is: 1.7< | R1/R6| < 2.3. The ratio of the curvature radius of the object side surface of the first lens to the curvature radius of the image side surface of the third lens is reasonably set, so that the system can well realize deflection of an optical path. More specifically, R1 and R6 satisfy:

1.8< | R1/R6| <2.2, e.g., 1.83 ≦ R1/R6| ≦ 2.19.

In the present exemplary embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy the conditional expression: 0.1< (f1+ f2)/(f1-f2) < 0.6. Through the effective focal length of the first lens and the second lens which are reasonably adjusted, on one hand, the focal power of the lens group can be more reasonably distributed, and the imaging quality of the system is favorably improved and the sensitivity of the system is favorably reduced. More specifically, f1 and f2 satisfy: 0.2< (f1+ f2)/(f1-f2) <0.57, for example, 0.21 ≦ (f1+ f2)/(f1-f2) ≦ 0.56.

In the present exemplary embodiment, the central thickness CT4 of the fourth lens on the optical axis and the effective focal length f4 of the fourth lens satisfy the conditional expression: -4.5< ln (CT4/f4) < -2.2. By controlling the effective focal length of the fourth lens and the effective focal length of the fourth lens within a reasonable range, the light convergence of the fourth lens is stronger, and the imaging quality of the mobile phone is better. More specifically, CT4 and f4 satisfy: -4.3< ln (CT4/f4) < -2.4, for example, -4.25. ltoreq. ln (CT4/f 4). ltoreq.2.47.

In the present exemplary embodiment, the conditional expression that the sum Σ CT of the center thicknesses on the optical axis of all lenses and the sum Σ Vd of all lens dispersion coefficients satisfy is: 0.65mm <50 x Σ CT/Σ Vd <0.75 mm. The ratio of the sum of the central thicknesses of all lenses on the optical axis of the image lens to the sum of the dispersion coefficients of all lenses is adjusted, the dispersion coefficient of the system is controlled, and the imaging quality of the lens is improved. More specifically, Σ CT and Σ Vd satisfy: 0.68mm <50 x Σ CT/Σ Vd <0.72mm, for example, 0.69mm ≦ 50 x Σ CT/Σ Vd ≦ 0.71 mm.

In the present exemplary embodiment, the effective half aperture DT41 of the object-side surface of the fourth lens and the effective half aperture DT21 of the object-side surface of the second lens satisfy the conditional expression: 2.3< DT41/DT21< 3.3. The size of the lens can be reduced by limiting the effective half aperture of the object side surface of the fourth lens and the effective half aperture of the object side surface of the second lens within a reasonable range, the miniaturization of the lens is met, and the resolving power is improved. More specifically, DT41 and DT21 satisfy: 2.5< DT41/DT21<3.1, e.g., 2.56 ≦ DT41/DT21 ≦ 3.09.

In the present exemplary embodiment, the effective focal length f of the image lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy the following conditional expression: (f + | f3|)/f4< 0.6. By reasonably adjusting the effective focal length of the image lens, on one hand, the focal power of the lens group can be more reasonably distributed, and further good imaging quality is obtained. More specifically, f3 and f4 satisfy: 0< (f + | f3|)/f4<0.57, e.g., 0.08 ≦ (f + | f3|)/f4 ≦ 0.56.

In the present exemplary embodiment, the distance SD between the stop and the image-side surface of the fourth lens in the image lens on the optical axis and the entrance pupil diameter EPD of the image lens satisfy the following conditional expression: 2.8< SD/EPD < 3.3. The ratio of the distance between the diaphragm and the image side surface of the fourth lens on the optical axis to the diameter of the entrance pupil is controlled, so that the light flux of the lens can be effectively increased, high relative illumination is possessed, and the imaging quality of the lens in a dark environment can be well improved. More specifically, SD and EPD satisfy: 2.9< SD/EPD <3.25, e.g., 2.96 ≦ SD/EPD ≦ 3.20.

In the present exemplary embodiment, the conditional expression that half ImgH of the diagonal length of the effective pixel area on the imaging plane and half Semi-FOV of the maximum field angle of the image lens satisfy is: 1mm < ImgH/tan (Semi-FOV) ^2<1.5 mm. Controlling ImgH/tan (Semi-FOV) ^2 within a proper range, and under the condition of keeping the lens group thinner, enabling the lens to have a wider imaging surface and being helpful for the larger field angle of the lens. More specifically, ImgH and Semi-FOV satisfy: 1.05mm < ImgH/tan (Semi-FOV) ^2<1.4mm, for example, 1.09mm ≦ ImgH/tan (Semi-FOV) ^2 ≦ 1.39 mm.

In this exemplary embodiment, the image lens may further include a diaphragm. The stop may be disposed at an appropriate position as needed, for example, the stop may be disposed between the object side and the first lens. Optionally, the imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface.

The image lens system according to the present invention can employ a plurality of lenses, such as the four lenses described above. The focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like are reasonably distributed, so that the imaging lens has a larger imaging image surface, has the characteristics of wide imaging range and high imaging quality, and ensures the ultrathin property of the mobile phone.

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

However, it will be appreciated by those skilled in the art that the number of lenses constituting the image lens can be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although four lenses are exemplified in the embodiment, the image lens is not limited to include four lenses, and the image lens may include other numbers of lenses if necessary.

Specific embodiments of the imaging lens suitable for the above embodiments are further described below with reference to the drawings.

Detailed description of the preferred embodiment 1

Fig. 1 is a schematic view of a lens assembly according to embodiment 1 of the present disclosure, wherein the image lens assembly sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

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

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

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Abbe number	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
S1	Aspherical surface	-2.7183	0.5198	-4.19	1.54	56.1	-12.6137
								S2	Aspherical surface	15.4919	0.5820				-61.5316
STO	Spherical surface	All-round	0.0300
								S3	Aspherical surface	1.4686	1.1945	1.39	1.54	56.1	3.6850
S4	Aspherical surface	-1.1139	0.0300				-0.2501
								S5	Aspherical surface	5.3579	0.2324	-2.44	1.67	19.2	29.1051
S6	Aspherical surface	1.2423	0.3591				-0.7395
								S7	Aspherical surface	1.1360	0.6409	7.84	1.54	55.7	-1.0915
S8	Aspherical surface	1.2488	0.3433				-0.7339
								S9	Spherical surface	All-round	0.2100		1.51	64.2
S10	Spherical surface	All-round	0.4415
								S11	Spherical surface	All-round

TABLE 1

As shown in table 2, in example 1, the total effective focal length f of the image lens is 1.90mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the image forming surface S11 is 4.58mm, the half ImgH of the diagonal line length of the effective pixel region on the image forming surface S11 is 2.47mm, and the half semifov of the maximum field angle of the optical imaging system is 54.75 °.

TABLE 2

The image shot in embodiment 1 satisfies:

TTL/ImgH × tan (Semi-FOV) is 2.63, where TTL is the distance on the optical axis from the object-side surface of the first lens of the image lens to the image plane, ImgH is half the diagonal length of the effective pixel area on the image plane, and Semi-FOV is half the maximum field angle of the image lens;

f/(R3-R4) is 0.74, where f is the effective focal length of the image lens, R3 is the radius of curvature of the object-side surface of the second lens element, and R4 is the radius of curvature of the image-side surface of the second lens element;

the FOV is 109.5 degrees, wherein the FOV is the maximum field angle of the image lens;

l R1/R6| ═ 2.19, where R1 is the radius of curvature of the object-side surface of the first lens and R6 is the radius of curvature of the image-side surface of the third lens;

(f1+ f2)/(f1-f2) ═ 0.50, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens;

ln (CT4/f4) — 2.50, where CT4 is the central thickness of the fourth lens on the optical axis, and f4 is the effective focal length of the fourth lens;

50 x sigma CT/sigma Vd is 0.69mm, wherein sigma CT is the sum of the central thicknesses of all lenses on the optical axis, and sigma Vd is the sum of all lens dispersion coefficients;

DT41/DT21 is 2.79, where DT41 is the effective half aperture of the object side surface of the fourth lens and DT21 is the effective half aperture of the object side surface of the second lens;

(f + | f3|)/f4 ═ 0.55, where f is the effective focal length of the image lens, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens;

SD/EPD is 2.96, where SD is the distance on the optical axis from the diaphragm to the image side of the fourth lens in the image lens, and EPD is the diameter of the entrance pupil of the image lens;

ImgH/tan (Semi-FOV) ^2 is 1.23mm, wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane, and Semi-FOV is half of the maximum field angle of the image lens.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the fourth lens E4 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); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface.

In example 1, the object-side surface and the image-side surface of any one of the first lens E1 through the fourth lens E4 are aspheric, and table 3 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S8 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂And A₂₄。

TABLE 3

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

Specific example 2

Fig. 3 is a schematic view of a lens assembly according to embodiment 2 of the present invention, the image lens assembly sequentially includes, along an optical axis, from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

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

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

TABLE 4

As shown in table 5, in example 2, the total effective focal length f of the image lens is 1.89mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the image forming surface S11 is 4.60mm, the half ImgH of the diagonal line length of the effective pixel region on the image forming surface S11 is 2.20mm, and the half semifov of the maximum field angle of the optical imaging system is 54.83 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 5

In example 2, the object-side surface and the image-side surface of any one of the first lens E1 to the fourth lens E4 are aspheric, and table 6 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S8 in example 2₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂And A₂₄。

TABLE 6

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

Specific example 3

Fig. 5 is a schematic view of a lens assembly according to embodiment 3 of the present disclosure, wherein the image lens assembly sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

As shown in table 7, the basic parameter table of the imaging lens system of embodiment 3 is shown, wherein the curvature radius, thickness and focal length are all in millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Abbe number	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
S1	Aspherical surface	-2.4821	0.5764	-3.67	1.54	56.1	-14.0960
								S2	Aspherical surface	11.2688	0.6090				-99.0000
STO	Spherical surface	All-round	0.0300
								S3	Aspherical surface	1.4758	1.1784	1.39	1.54	56.1	3.6626
S4	Aspherical surface	-1.1178	0.0300				-0.2058
								S5	Aspherical surface	4.2588	0.2468	-2.62	1.67	19.2	-1.0000
S6	Aspherical surface	1.2244	0.4140				-0.7336
								S7	Aspherical surface	1.1458	0.6640	7.88	1.54	55.7	-1.0990
S8	Aspherical surface	1.2526	0.3386				-0.7311
								S9	Spherical surface	All-round	0.2100		1.51	64.2
S10	Spherical surface	All-round	0.4003
								S11	Spherical surface	All-round

TABLE 7

As shown in table 8, in example 3, the total effective focal length f of the image lens is 1.82mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the image forming surface S11 is 4.70mm, the half ImgH of the diagonal line length of the effective pixel region on the image forming surface S11 is 2.47mm, and the half semifov of the maximum field angle of the optical imaging system is 55.65 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 8

In example 3, the object-side surface and the image-side surface of any one of the first lens E1 to the fourth lens E4 are aspheric, and table 9 shows the high-order term coefficients a usable for the aspheric mirror surfaces S1 to S8 in example 3₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂And A₂₄。

TABLE 9

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

Specific example 4

Fig. 7 is a schematic view of a lens assembly according to embodiment 4 of the present disclosure, wherein the image lens assembly sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

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

As shown in table 10, the basic parameter table of the imaging lens system of embodiment 4 is shown, wherein the curvature radius, thickness and focal length are all in millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Abbe number	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
S1	Aspherical surface	-2.2794	0.5049	-5.36	1.54	56.1	-13.8105
								S2	Aspherical surface	-11.1001	0.4733				-65.4214
STO	Spherical surface	All-round	0.0300
								S3	Aspherical surface	1.7872	1.1902	1.50	1.54	56.1	-0.5502
S4	Aspherical surface	-1.1609	0.0300				-0.3486
								S5	Aspherical surface	3.4696	0.2479	-2.97	1.67	19.2	-1.0000
S6	Aspherical surface	1.2379	0.4537				-0.6786
								S7	Aspherical surface	1.2327	0.7001	14.82	1.54	55.7	-1.0916
S8	Aspherical surface	1.1690	0.3497				-0.7334
								S9	Spherical surface	All-round	0.2100		1.51	64.2
S10	Spherical surface	All-round	0.3601
								S11	Spherical surface	All-round

Watch 10

As shown in table 11, in example 4, the total effective focal length f of the image lens is 2.01mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the image forming surface S11 is 4.55mm, the half ImgH of the diagonal line length of the effective pixel region on the image forming surface S11 is 2.47mm, and the half semifov of the maximum field angle of the optical imaging system is 53.08 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 11

In example 4, the object-side surface and the image-side surface of any one of the first lens E1 to the fourth lens E4 are aspheric, and table 12 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S8 in example 4₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.3323E-01

-2.0924E-01

2.7284E-01

-3.4907E-01

3.5821E-01

-2.5270E-01

1.1160E-01

S2

7.1632E-01

-2.5442E+00

2.2934E+01

-1.3638E+02

5.1526E+02

-1.2006E+03

1.6662E+03

S3

1.6940E-01

-3.3050E+00

1.5239E+02

-3.6948E+03

5.3883E+04

-5.1275E+05

3.3334E+06

S4

-1.2027E+00

1.8015E+01

-1.1852E+02

4.7363E+02

-1.2308E+03

2.0844E+03

-2.2146E+03

S5

-2.1042E+00

2.0346E+01

-1.1045E+02

2.9795E+02

1.4462E+02

-4.5643E+03

1.8663E+04

S6

-1.5066E+00

7.7686E+00

-2.8319E+01

7.0702E+01

-1.2207E+02

1.4219E+02

-1.0594E+02

S7

-4.9325E-01

4.9363E-01

-3.9659E-01

2.2940E-01

-8.3176E-02

1.4574E-02

2.9672E-04

S8

-3.4210E-01

1.6888E-01

-5.0749E-02

-1.1177E-02

1.7898E-02

-8.0068E-03

1.9116E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.7538E-02

2.8708E-03

0.0000E+00

S2

-1.2481E+03

3.8349E+02

0.0000E+00

S3

-1.5178E+07

4.8845E+07

-1.1048E+08

1.7158E+08

-1.7392E+08

1.0340E+08

-2.7275E+07

S4

1.3371E+03

-3.4927E+02

0.0000E+00

S5

-4.1056E+04

5.3227E+04

-3.8264E+04

1.1782E+04

0.0000E+00

S6

4.5360E+01

-8.4555E+00

0.0000E+00

S7

-4.9244E-04

5.0779E-05

0.0000E+00

S8

-2.4877E-04

1.3940E-05

0.0000E+00

TABLE 12

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

Specific example 5

Fig. 9 is a schematic view of a lens assembly according to embodiment 5 of the present disclosure, wherein the image lens assembly sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

As shown in table 13, the basic parameter tables of the imaging lens system of embodiment 5 are shown, wherein the curvature radius, thickness and focal length are all in millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Abbe number	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
S1	Aspherical surface	-2.3472	0.5091	-5.12	1.54	56.1	-13.7423
								S2	Aspherical surface	-15.7055	0.4689				-99.0000
STO	Spherical surface	All-round	0.0300
								S3	Aspherical surface	1.7497	1.1541	1.48	1.54	56.1	-0.4832
S4	Aspherical surface	-1.1516	0.0300				-0.3074
								S5	Aspherical surface	3.6475	0.2546	-2.84	1.67	19.2	-1.0000
S6	Aspherical surface	1.2236	0.4293				-0.7371
								S7	Aspherical surface	1.1946	0.7016	9.83	1.54	55.7	-1.0996
S8	Aspherical surface	1.2269	0.3478				-0.7312
								S9	Spherical surface	All-round	0.2100		1.51	64.2
S10	Spherical surface	All-round	0.3646
								S11	Spherical surface	All-round

Watch 13

As shown in table 14, in example 5, the total effective focal length f of the image lens is 1.96mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the image forming surface S11 is 4.50mm, the half ImgH of the diagonal line length of the effective pixel region on the image forming surface S11 is 2.47mm, and the half semifov of the maximum field angle of the optical imaging system is 53.55 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 14

In example 5, the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric, and table 15 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S8 in example 5₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Watch 15

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

Specific example 6

Fig. 11 is a schematic view of a lens assembly according to embodiment 6 of the present disclosure, wherein the image lens assembly sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

As shown in table 16, the basic parameter tables of the imaging lens system of embodiment 6 are shown, wherein the curvature radius, thickness and focal length are all in millimeters (mm).

TABLE 16

As shown in table 17, in example 6, the total effective focal length f of the image lens is 2.00mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the image forming surface S11 is 4.50mm, the half ImgH of the diagonal line length of the effective pixel region on the image forming surface S11 is 2.47mm, and the half semifov of the maximum field angle of the optical imaging system is 53.10 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 17

In example 6, the object-side surface and the image-side surface of any one of the first lens element E1 to the fourth lens element E4 are aspheric, and table 18 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S8 in example 6₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Watch 18

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

Specific example 7

Fig. 13 is a schematic view of a lens assembly according to embodiment 7 of the present disclosure, wherein the image lens assembly sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

As shown in table 19, the basic parameter tables of the imaging lens system of embodiment 7 are shown, wherein the curvature radius, thickness and focal length are all in millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Abbe number	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
S1	Aspherical surface	-2.1805	0.4941	-5.00	1.54	56.1	-13.1601
								S2	Aspherical surface	-11.6763	0.4942				6.5233
STO	Spherical surface	All-round	0.0300
								S3	Aspherical surface	1.7126	1.1962	1.47	1.54	56.1	-0.7558
S4	Aspherical surface	-1.1437	0.0308				-0.2782
								S5	Aspherical surface	3.3715	0.2506	-2.86	1.67	19.2	-6.5430
S6	Aspherical surface	1.1940	0.4496				-0.7829
								S7	Aspherical surface	1.2520	0.6854	13.75	1.54	55.7	-1.0982
S8	Aspherical surface	1.2191	0.3461				-0.7326
								S9	Spherical surface	All-round	0.2100		1.51	64.2
S10	Spherical surface	All-round	0.3629
								S11	Spherical surface	All-round

Watch 19

As shown in table 20, in example 7, the total effective focal length f of the image lens is 1.99mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the image forming surface S11 is 4.55mm, the half ImgH of the diagonal line length of the effective pixel region on the image forming surface S11 is 2.47mm, and the half semifov of the maximum field angle of the optical imaging system is 53.25 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

Watch 20

In example 7, the object-side surface and the image-side surface of any one of the first lens E1 to the fourth lens E4 are aspheric, and table 21 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S8 in example 7₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.3932E-01

-2.1137E-01

2.4253E-01

-2.7134E-01

2.6156E-01

-1.8352E-01

8.2805E-02

S2

6.5545E-01

-1.3313E+00

1.0282E+01

-5.8297E+01

2.1827E+02

-5.0532E+02

6.9822E+02

S3

1.4934E-02

1.0956E+01

-4.9094E+02

1.2782E+04

-2.1264E+05

2.3840E+06

-1.8612E+07

S4

-1.2950E+00

1.9881E+01

-1.3523E+02

5.5825E+02

-1.4975E+03

2.6164E+03

-2.8663E+03

S5

-2.2088E+00

2.1515E+01

-1.1502E+02

2.8677E+02

1.5203E+02

-2.2428E+03

-5.9509E+03

S6

-1.5463E+00

8.0774E+00

-2.9963E+01

7.5757E+01

-1.3193E+02

1.5487E+02

-1.1643E+02

S7

-4.6620E-01

4.5267E-01

-3.5511E-01

2.0229E-01

-7.3764E-02

1.4245E-02

-6.0794E-04

S8

-2.9277E-01

8.8400E-02

4.5912E-02

-8.9202E-02

6.0152E-02

-2.3058E-02

5.2670E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.1142E-02

2.2919E-03

0.0000E+00

S2

-5.1985E+02

1.5743E+02

0.0000E+00

S3

1.0303E+08

-4.0666E+08

1.1363E+09

-2.1947E+09

2.7859E+09

-2.0903E+09

7.0227E+08

S4

1.7832E+03

-4.7948E+02

0.0000E+00

S5

9.3203E+04

-4.1279E+05

1.0520E+06

-1.7118E+06

1.7708E+06

-1.0687E+06

2.8757E+05

S6

5.0421E+01

-9.5341E+00

0.0000E+00

S7

-2.1665E-04

2.5103E-05

0.0000E+00

S8

-6.6989E-04

3.6545E-05

0.0000E+00

TABLE 21

Fig. 14a shows distortion curves of the image lens of example 7, which indicate distortion magnitude values corresponding to different image heights. Fig. 14b shows an axial chromatic aberration curve of the imaging lens of example 7, which indicates the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 14c shows astigmatism curves representing meridional field curvature and sagittal field curvature of the image lens of example 7. As can be seen from fig. 14a to 14c, the imaging lens according to embodiment 7 can achieve good imaging quality.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, improvements, equivalents, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An imaging lens, comprising:

at least 1 diaphragm and 4 lenses;

a first lens having a negative refractive power, an object side surface of which is a concave surface;

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

a third lens element having a concave image-side surface;

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

2. The imaging lens of claim 1, wherein: the effective focal length f of the image lens, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens meet the following conditions: 0.65< f/(R3-R4) < 0.75.

3. The imaging lens of claim 1, wherein: the maximum field angle FOV of the image lens meets the following requirements: 100 ° < FOV <115 °.

4. The imaging lens of claim 1, wherein: a radius of curvature R1 of the first lens object-side surface and a radius of curvature R6 of the third lens image-side surface satisfy: 1.7< | R1/R6| < 2.3.

5. The imaging lens of claim 1, wherein: the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 0.1< (f1+ f2)/(f1-f2) < 0.6.

6. The imaging lens of claim 1, wherein: the central thickness CT4 of the fourth lens on the optical axis and the effective focal length f4 of the fourth lens meet the following conditions: -4.5< ln (CT4/f4) < -2.2.

7. The imaging lens of claim 1, wherein: the sum sigma CT of the central thicknesses of all the lenses on the optical axis and the sum sigma Vd of the dispersion coefficients of all the lenses satisfy: 0.65mm <50 x Σ CT/Σ Vd <0.75 mm.

8. The imaging lens of claim 1, wherein: the effective semi-aperture DT41 of the object side surface of the fourth lens and the effective semi-aperture DT21 of the object side surface of the second lens meet the following conditions: 2.3< DT41/DT21< 3.3.

9. The imaging lens of claim 1, wherein: the effective focal length f of the image lens, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy the following conditions: (f + | f3|)/f4< 0.6.

10. The imaging lens of claim 1, wherein: the distance SD between the diaphragm and the image side surface of the fourth lens in the image lens on the optical axis and the entrance pupil diameter EPD of the image lens meet the following requirements: 2.8< SD/EPD < 3.3.

11. The imaging lens of claim 1, wherein: half of the diagonal length ImgH of the effective pixel area on the imaging surface and half of the maximum field angle Semi-FOV of the image lens satisfy: 1mm < ImgH/tan (Semi-FOV) ^2<1.5 mm.

12. An imaging lens, comprising:

at least 1 diaphragm and 4 lenses;

the first lens with negative focal power, the object side surface of the first lens is a concave surface, and the object side surface of the first lens is provided with at least one point of inflection;

the second lens with positive focal power has a convex object-side surface and a convex image-side surface;

a third lens element having a concave image-side surface;

a fourth lens having a positive optical power;

wherein the effective focal length f of the image lens, the curvature radius R3 of the object-side surface of the second lens and the curvature radius R4 of the image-side surface of the second lens satisfy: 0.65< f/(R3-R4) < 0.75.

13. The imaging lens of claim 12, wherein: the distance TTL from the object side surface of the first lens of the image lens to the image surface on the optical axis, half ImgH of the diagonal length of the effective pixel area on the imaging surface and half Semi-FOV of the maximum field angle of the image lens meet the following requirements: 2.2< TTL/ImgH × tan (Semi-FOV) < 3.1.

14. The imaging lens of claim 12, wherein: the maximum field angle FOV of the image lens meets the following requirements: 100 ° < FOV <115 °.

15. The imaging lens of claim 12, wherein: a radius of curvature R1 of the first lens object-side surface and a radius of curvature R6 of the third lens image-side surface satisfy: 1.7< | R1/R6| < 2.3.

16. The imaging lens of claim 12, wherein: the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 0.1< (f1+ f2)/(f1-f2) < 0.6.

17. The imaging lens of claim 12, wherein: the central thickness CT4 of the fourth lens on the optical axis and the effective focal length f4 of the fourth lens meet the following conditions: -4.5< ln (CT4/f4) < -2.2.

18. The imaging lens of claim 12, wherein: the sum sigma CT of the central thicknesses of all the lenses on the optical axis and the sum sigma Vd of the dispersion coefficients of all the lenses satisfy: 0.65mm <50 x Σ CT/Σ Vd <0.75 mm.

19. The imaging lens of claim 12, wherein: the effective semi-aperture DT41 of the object side surface of the fourth lens and the effective semi-aperture DT21 of the object side surface of the second lens meet the following conditions: 2.3< DT41/DT21< 3.3.

20. The imaging lens of claim 12, wherein: the effective focal length f of the image lens, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy the following conditions: (f + | f3|)/f4< 0.6.

21. The imaging lens of claim 12, wherein: the distance SD between the diaphragm and the image side surface of the fourth lens in the image lens on the optical axis and the entrance pupil diameter EPD of the image lens meet the following requirements: 2.8< SD/EPD < 3.3.

22. The imaging lens of claim 12, wherein: half of the diagonal length ImgH of the effective pixel area on the imaging surface and half of the maximum field angle Semi-FOV of the image lens satisfy: 1mm < ImgH/tan (Semi-FOV) ^2<1.5 mm.