CN113759509B

CN113759509B - Optical imaging lens

Info

Publication number: CN113759509B
Application number: CN202111076882.6A
Authority: CN
Inventors: 徐鑫垚; 吕赛锋; 李林阳; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2022-09-30
Anticipated expiration: 2041-09-14
Also published as: CN113759509A

Abstract

The invention provides an optical imaging lens. Include along object side to image side in proper order: a first lens having a negative focal power; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; a third lens; a fourth lens having a negative focal power; wherein, the maximum effective radius 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 satisfy: DT11/ImgH < 0.4; the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following conditions: f/EPD <2. The invention solves the problem that the optical imaging lens in the prior art has small head and large aperture which are difficult to be considered simultaneously.

Description

Optical imaging lens

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to an optical imaging lens.

Background

With the continuous development of science and technology, people have higher and higher requirements on mobile phone lenses, not only are clear and large image planes, but also due to the continuous popularization of a full-screen mobile phone, the design of the small-head lens is convenient to hide, is convenient to carry and is more attractive; the demand for lenses with small heads is increasing along with the development of the industry. Meanwhile, the lens with the large aperture can obtain a relatively simple background in a messy environment, so that the main body is more prominent; and has higher light entering amount, thereby ensuring the imaging quality. At present, the aperture of some small-head optical imaging lenses is small, the light incoming quantity is small, and the requirements are difficult to meet.

That is, the optical imaging lens in the prior art has a problem that the small head and the large aperture are difficult to be compatible.

Disclosure of Invention

The invention mainly aims to provide an optical imaging lens, which solves the problem that the optical imaging lens in the prior art is difficult to realize both small head and large aperture.

In order to achieve the above object, according to an aspect of the present invention, there is provided an optical imaging lens comprising, in order from an object side to an image side: a first lens having a negative focal power; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; a third lens; a fourth lens having a negative focal power; wherein, the maximum effective radius 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 satisfy: DT11/ImgH < 0.4; the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: f/EPD <2.

Further, the maximum effective radius DT11 of the object side surface of the first lens and the aperture value fno of the optical imaging lens satisfy: DT11/fno <0.2 mm.

Further, an on-axis distance TTL from the object-side surface of the first lens element to the imaging surface satisfies: TTL <2 mm.

Further, the on-axis distance SL from the diaphragm to the imaging surface and the on-axis distance TTL from the object side surface of the first lens to the imaging surface satisfy: 0.9< SL/TTL <1.

Further, the effective focal length f of the optical imaging lens, half of the diagonal length ImgH of the effective pixel area on the imaging plane and half of the maximum field angle Semi-FOV of the optical imaging lens satisfy: 0.9< f/ImgH tan (Semi-FOV) < 1.1.

Further, an on-axis distance TTL from the object-side surface of the first lens element to the image plane and an on-axis distance TD from the object-side surface of the first lens element to the image-side surface of the fourth lens element satisfy: 0.7< TD/TTL < 0.8.

Further, the length of half of the diagonal line ImgH of the effective pixel area on the imaging surface, the on-axis distance SL from the diaphragm to the imaging surface and the aperture value fno of the optical imaging lens satisfy: 0.9< ImgH × fno/SL < 1.1.

Further, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.5< (f1-f2)/(f2-f3) <3.

Further, the effective focal length f of the optical imaging lens, the combined focal length f12 of the first lens and the second lens, and the combined focal length f23 of the second lens and the third lens satisfy: 0.6< (f12-f23)/f < 0.8.

Further, the combined focal length f12 of the first lens and the second lens, the combined focal length f34 of the third lens and the fourth lens, and the effective focal length f of the optical imaging lens satisfy: 3.5< (f12+ f34)/f < 5.5.

Further, the combined focal length f123 of the first lens, the second lens and the third lens and the combined focal length f234 of the second lens, the third lens and the fourth lens satisfy: 0.5< f234/f123< 0.6.

Further, a radius of curvature R1 of the object-side surface of the first lens, a radius of curvature R2 of the image-side surface of the first lens, a radius of curvature R7 of the object-side surface of the fourth lens, and a radius of curvature R8 of the image-side surface of the fourth lens satisfy: 2.5< (R1-R2)/(R7-R8) < 4.

Further, a sum Σ AT of air spaces on the optical axis between adjacent two lenses of the first to fourth lenses, a sum Σ CT of center thicknesses on the optical axis of the first to fourth lenses, and a distance BFL on the optical axis from the image-side surface of the fourth lens to the image-forming surface satisfy: 0.4< (∑ AT + BFL)/. Σ CT < 0.7.

Further, a sum Σ AT of air intervals on the optical axis between adjacent two lenses among the first lens to the fourth lens and an air interval T23 on the optical axis between the second lens and the third lens satisfy: 0.9< T23/∑ AT.

Further, the maximum center thickness CT of the first lens to the fourth lens on the optical axis _MAX Minimum center thickness CT on optical axis with the first to fourth lenses _MIN Satisfies the following conditions: 1.9<CT _MAX /CT _MIN <2.1。

Further, a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.7< (CT1+ CT2)/(CT3+ CT4) < 0.9.

Further, the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT21 of the object side surface of the second lens and the maximum effective radius DT41 of the object side surface of the fourth lens satisfy: 0< (DT21-DT11)/(DT41-DT11) < 0.1.

Further, the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT41 of the object side surface of the fourth lens and the maximum effective radius SR of the diaphragm satisfy: 1< (DT41-DT11)/SR < 1.5.

Further, the maximum effective radius DT31 of the object side surface of the third lens and the maximum effective radius DT41 of the object side surface of the fourth lens satisfy: 1.3< DT41/DT31< 1.6.

Further, the central thickness CT1 of the first lens on the optical axis and the edge thickness ET1 of the first lens satisfy: 0.9< CT1/ET1< 1.

Further, the edge thicknesses ET1, ET2, ET3 and ET4 of the first, second, third and fourth lenses satisfy: 0.8< (ET2+ ET3)/ET4< 1.2.

According to another aspect of the present invention, there is provided an optical imaging lens, comprising, in order from an object side to an image side: a first lens having a negative focal power; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; a third lens; a fourth lens having a negative focal power; wherein, the maximum effective radius 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 satisfy the following conditions: DT11/ImgH < 0.4; half of the diagonal length ImgH of the effective pixel area on the imaging surface, the on-axis distance SL from the diaphragm to the imaging surface and the aperture value fno of the optical imaging lens meet the following conditions: 0.9< ImgH × fno/SL < 1.1.

Further, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 2; the maximum effective radius DT11 of the object side surface of the first lens and the aperture value fno of the optical imaging lens satisfy that: DT11/fno <0.2 mm.

Further, an on-axis distance TTL from the object side surface of the first lens element to the image plane satisfies: TTL <2 mm.

Further, the effective focal length f of the optical imaging lens, 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 optical imaging lens satisfy: 0.9< f/ImgH tan (Semi-FOV) < 1.1.

Further, a sum Σ AT of air intervals on the optical axis between adjacent two lenses of the first to fourth lenses and an air interval T23 on the optical axis between the second lens and the third lens satisfy: 0.9< T23/∑ AT.

Further, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens and the edge thickness ET4 of the fourth lens satisfy: 0.8< (ET2+ ET3)/ET4< 1.2.

By applying the technical scheme of the invention, the optical imaging lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side, wherein the first lens has negative focal power; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the fourth lens has negative focal power; wherein, the maximum effective radius 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 satisfy: DT11/ImgH < 0.4; the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: f/EPD <2.

By reasonably distributing the focal power and the surface type of each lens, the field angle is increased, the light ray incidence angle at the position of the diaphragm is compressed, the pupil aberration is reduced, and the imaging quality of the optical imaging lens is greatly improved. By limiting the ratio between the maximum effective radius DT11 of the object side surface of the first lens and half ImgH of the diagonal length of the effective pixel area on the image plane to within a reasonable range, a small head design is facilitated. The characteristic of large aperture of the optical imaging lens is facilitated by limiting the ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens within a reasonable range. The optical imaging lens has the advantages of being small in head and large in aperture, and capable of guaranteeing imaging quality.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

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

fig. 2 to 5 respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens in fig. 1;

fig. 6 is a schematic view showing a configuration of an optical imaging lens according to a second example of the present invention;

fig. 7 to 10 respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens in fig. 6;

fig. 11 is a schematic structural view showing an optical imaging lens of example three of the present invention;

fig. 12 to 15 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 11;

fig. 16 is a schematic configuration diagram showing an optical imaging lens of example four of the present invention;

fig. 17 to 20 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 16;

fig. 21 is a schematic view showing a configuration of an optical imaging lens of example five of the present invention;

fig. 22 to 25 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 21.

Wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the object side surface of the first lens; s2, an image side surface of the first lens; e2, second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, third lens; s5, the object side surface of the third lens; s6, an image side surface of the third lens; e4, fourth lens; s7, the object side surface of the fourth lens; s8, an image side surface of the fourth lens element; e5, optical filters; s9, the object side surface of the optical filter; s10, the image side surface of the optical filter; and S11, imaging surface.

Detailed Description

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

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

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

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, 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 close to the object side becomes the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. Regarding the object side, when the R value is positive, the object side is judged to be convex, and when the R value is negative, the object side is judged to be concave; in the case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

The invention provides an optical imaging lens, which aims to solve the problem that the optical imaging lens in the prior art cannot give consideration to both small head and large aperture.

Example one

As shown in fig. 1 to 25, the optical imaging lens includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, and a fourth lens element, where the first lens element has a negative refractive power; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the fourth lens has negative focal power; wherein, the maximum effective radius 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 satisfy: DT11/ImgH < 0.4; the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: f/EPD <2.

Preferably, 0.3< DT11/ImgH < 0.4.

Preferably, f/EPD is 1.84.

By reasonably distributing the focal power and the surface type of each lens, the field angle is increased, the light ray incidence angle at the position of the diaphragm is compressed, the pupil aberration is reduced, and the imaging quality of the optical imaging lens is greatly improved. By limiting the ratio between the maximum effective radius DT11 of the object side surface of the first lens and half ImgH of the diagonal length of the effective pixel area on the imaging surface within a reasonable range, it is advantageous to achieve a small head design. The characteristic of large aperture of the optical imaging lens is facilitated by limiting the ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens within a reasonable range. The optical imaging lens has the advantages of being small in head and large in aperture, and capable of guaranteeing imaging quality.

In this embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the aperture value fno of the optical imaging lens satisfy: DT11/fno <0.2 mm. By constraining the ratio between the maximum effective radius DT11 of the object side surface of the first lens and the aperture value fno of the optical imaging lens to be within a reasonable range, the small head design is facilitated. Preferably, 0.1mm < DT11/fno <0.2 mm.

In this embodiment, the on-axis distance TTL from the object-side surface of the first lens element to the imaging surface satisfies: TTL <2 mm. The axial distance TTL from the object side surface of the first lens to the imaging surface is restrained within a reasonable range, so that the whole size of the optical imaging lens is reduced, and miniaturization is guaranteed. Preferably, 1.9mm < TTL <2 mm.

In this embodiment, the on-axis distance SL from the stop to the imaging surface and the on-axis distance TTL from the object-side surface of the first lens to the imaging surface satisfy: 0.9< SL/TTL <1. Through the position of reasonable setting diaphragm, can effectual correction with the coma, astigmatism, distortion and the axial chromatic aberration that the diaphragm is relevant. Preferably, SL/TTL ═ 0.98.

In the embodiment, the effective focal length f of the optical imaging lens, half of the diagonal length ImgH of the effective pixel area on the imaging plane, and half of the maximum field angle Semi-FOV of the optical imaging lens satisfy: 0.9< f/ImgH tan (Semi-FOV) < 1.1. The total length of a compression system is facilitated and miniaturization is realized by constraining the relation among the effective focal length f of the optical imaging lens, 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 optical imaging lens within a reasonable range. Preferably, 0.9< f/ImgH tan (Semi-FOV). ltoreq.1.0.

In this embodiment, an on-axis distance TTL from the object-side surface of the first lens element to the image plane and an on-axis distance TD from the object-side surface of the first lens element to the image-side surface of the fourth lens element satisfy: 0.7< TD/TTL < 0.8. By constraining the conditional expression in a reasonable range, the whole size of the optical imaging lens is favorably controlled, and the small head is realized.

In the embodiment, the length ImgH of the half diagonal line of the effective pixel area on the imaging plane, the on-axis distance SL from the diaphragm to the imaging plane, and the aperture value fno of the optical imaging lens satisfy: 0.9< ImgH × fno/SL < 1.1. Half of the diagonal length of an effective pixel area on an imaging surface is restrained, and the relation between the axial distance SL from the diaphragm to the imaging surface and the aperture value fno of the optical imaging lens is in a reasonable range, so that the miniaturization of the module is favorably realized in balance, the characteristic of a small head is ensured, the wide angle can be realized, and the imaging quality is ensured. Preferably, 0.9< ImgH x fno/SL ≦ 1.0.

In the present embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: 1.5< (f1-f2)/(f2-f3) <3. By constraining this conditional expression, the overall size is made smaller. Preferably 1.7< (f1-f2)/(f2-f3) < 2.7.

In the present embodiment, the effective focal length f of the optical imaging lens, the combined focal length f12 of the first lens and the second lens, and the combined focal length f23 of the second lens and the third lens satisfy: 0.6< (f12-f23)/f < 0.8. By constraining this conditional expression within a reasonable range, the focal power of the system can be reasonably distributed, thereby improving the imaging quality.

In the present embodiment, the combined focal length f12 of the first lens and the second lens, the combined focal length f34 of the third lens and the fourth lens, and the effective focal length f of the optical imaging lens satisfy: 3.5< (f12+ f34)/f < 5.5. By reasonably constraining the conditional expression, the focal power of the system can be reasonably distributed, so that the positive spherical aberration and the negative spherical aberration of the front group of lenses and the rear group of lenses are mutually offset, and the imaging effect is ensured. Preferably, 3.8< (f12+ f34)/f < 5.3.

In the present embodiment, the combined focal length f123 of the first lens, the second lens, and the third lens and the combined focal length f234 of the second lens, the third lens, and the fourth lens satisfy: 0.5< f234/f123< 0.6. By reasonably constraining the conditional expression, the field curvature of the constraint system can be reasonably controlled within a certain range.

In the present embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R7 of the object-side surface of the fourth lens, and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: 2.5< (R1-R2)/(R7-R8) < 4. By reasonably constraining the conditional expression, the refraction angle of the system beam can be effectively controlled, and the good processing characteristic of the system is realized. Preferably, 2.6< (R1-R2)/(R7-R8) < 3.8.

In the present embodiment, a sum Σ AT of air spaces on the optical axis between adjacent two lenses of the first to fourth lenses, a sum Σ CT of center thicknesses on the optical axis of the first to fourth lenses, and a distance BFL on the optical axis from the image-side surface of the fourth lens to the imaging surface satisfy: 0.4< (∑ AT + BFL)/. Σ CT < 0.7. By reasonably constraining the conditional expression, the overall length of the system is favorably controlled, and further miniaturization is realized. Preferably, 0.5 ≦ (∑ AT + BFL)/. Σ CT < 0.7.

In the present embodiment, a sum Σ AT of air intervals on the optical axis between adjacent two lenses of the first to fourth lenses and an air interval T23 on the optical axis between the second lens and the third lens satisfy: 0.9< T23/sigma AT. By reasonably constraining the conditional expression, the distortion of the system can be reasonably controlled, so that the system has good distortion performance. Preferably, 0.9< T23/∑ AT < 1.0.

In the present embodiment, the maximum center thickness CT of the first lens to the fourth lens on the optical axis _MAX Minimum center thickness CT on optical axis with the first to fourth lenses _MIN Satisfies the following conditions: 1.9<CT _MAX /CT _MIN <2.1. By reasonably constraining the conditional expression, the stability of the system is facilitated. Preferably, 1.8<CT _MAX /CT _MIN <2.1。

In the present 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, the central thickness CT3 of the third lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0.7< (CT1+ CT2)/(CT3+ CT4) < 0.9. By reasonably constraining the conditional expression, the distortion quantity of the system can be reasonably regulated and controlled, and finally the distortion of the system is in a reasonable range.

In the present embodiment, the maximum effective radius DT11 of the object-side surface of the first lens, the maximum effective radius DT21 of the object-side surface of the second lens, and the maximum effective radius DT41 of the object-side surface of the fourth lens satisfy: 0< (DT21-DT11)/(DT41-DT11) < 0.1. By constraining the conditional expression, the miniaturization of the optical imaging lens is favorably ensured.

In the present embodiment, the maximum effective radius DT11 of the object-side surface of the first lens, the maximum effective radius DT41 of the object-side surface of the fourth lens, and the maximum effective radius SR of the stop satisfy: 1< (DT41-DT11)/SR < 1.5. By constraining the conditional expression, the miniaturization of the module can be realized in a better balance manner. Preferably, 1.1< (DT41-DT11)/SR < 1.4.

In the present embodiment, the maximum effective radius DT31 of the object-side surface of the third lens and the maximum effective radius DT41 of the object-side surface of the fourth lens satisfy: 1.3< DT41/DT31< 1.6. By constraining this conditional expression, it is advantageous to control the relative sizes of the third lens and the fourth lens to be small.

In the present embodiment, the central thickness CT1 of the first lens on the optical axis and the edge thickness ET1 of the first lens satisfy: 0.9< CT1/ET1< 1. By constraining the conditional expression, the processing manufacturability of the first lens is improved, and the molding and manufacturing difficulty is reduced.

In the present embodiment, the edge thicknesses ET1, ET2, ET3 and ET4 of the first lens, the second lens and the fourth lens satisfy: 0.8< (ET2+ ET3)/ET4< 1.2. Through the constraint condition formula, the relationship among the sizes of the second lens, the third lens and the fourth lens flange is favorably increased, and then the assembly in the same direction is realized. Preferably, 0.8< (ET2+ ET3)/ET4 ≦ 1.1.

Example two

As shown in fig. 1 to 25, the optical imaging lens includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, and a fourth lens element, where the first lens element has a negative refractive power; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the fourth lens has negative focal power; wherein, the maximum effective radius 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 satisfy: DT11/ImgH < 0.4; half of the diagonal length ImgH of the effective pixel area on the imaging surface, the on-axis distance SL from the diaphragm to the imaging surface and the aperture value fno of the optical imaging lens meet the following conditions: 0.9< ImgH × fno/SL < 1.1.

Preferably, 0.3< DT11/ImgH < 0.4.

Preferably, 0.9< ImgH x fno/SL ≦ 1.0.

By reasonably distributing the focal power and the surface type of each lens, the field angle is increased, the light ray incidence angle at the position of the diaphragm is compressed, the pupil aberration is reduced, and the imaging quality of the optical imaging lens is greatly improved. By limiting the ratio between the maximum effective radius DT11 of the object side surface of the first lens and half ImgH of the diagonal length of the effective pixel area on the image plane to within a reasonable range, a small head design is facilitated. By restraining the relation among half of the diagonal length of an effective pixel area on an imaging surface, the axial distance SL from a diaphragm to the imaging surface and the aperture value fno of the optical imaging lens within a reasonable range, the method is beneficial to balancing and realizing the miniaturization of a module, ensures the characteristics of a small head, can realize a wide angle and ensures the imaging quality. The optical imaging lens has the advantages of being small in head and large in aperture, and capable of guaranteeing imaging quality.

In the embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD <2. The characteristic of large aperture of the optical imaging lens is facilitated by limiting the ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens within a reasonable range. Preferably, f/EPD is 1.84.

In this embodiment, the on-axis distance TTL from the object-side surface of the first lens element to the image plane satisfies: TTL <2 mm. The axial distance TTL from the object side surface of the first lens to the imaging surface is restrained within a reasonable range, so that the whole size of the optical imaging lens is reduced, and miniaturization is guaranteed. Preferably, 1.9mm < TTL <2 mm.

In this embodiment, the on-axis distance SL from the stop to the imaging surface and the on-axis distance TTL from the object-side surface of the first lens to the imaging surface satisfy: 0.9< SL/TTL <1. Through the position of reasonable setting diaphragm, can effectual correction with the coma, astigmatism, distortion and the axial chromatic aberration that the diaphragm is relevant. Preferably, SL/TTL is 0.98.

In the embodiment, the effective focal length f of the optical imaging lens, 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 optical imaging lens satisfy: 0.9< f/ImgH tan (Semi-FOV) < 1.1. The total length of a compression system is facilitated and miniaturization is realized by constraining the relation among the effective focal length f of the optical imaging lens, 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 optical imaging lens within a reasonable range. Preferably, 0.9< f/ImgH tan (Semi-FOV). ltoreq.1.0.

In the present embodiment, the combined focal length f12 of the first lens and the second lens, the combined focal length f34 of the third lens and the fourth lens, and the effective focal length f of the optical imaging lens satisfy: 3.5< (f12+ f34)/f < 5.5. By reasonably constraining the conditional expression, the focal power of the system can be reasonably distributed, so that the positive spherical aberration and the negative spherical aberration of the front group lens and the rear group lens are mutually offset, and the imaging effect is ensured. Preferably, 3.8< (f12+ f34)/f < 5.3.

In the present embodiment, a sum Σ AT of air intervals on the optical axis between adjacent two lenses of the first to fourth lenses and an air interval T23 on the optical axis between the second lens and the third lens satisfy: 0.9< T23/∑ AT. By reasonably constraining the conditional expression, the distortion of the system can be reasonably controlled, so that the system has good distortion performance. Preferably, 0.9< T23/∑ AT < 1.0.

In the present embodiment, the maximum effective radius DT31 of the object side surface of the third lens and the maximum effective radius DT41 of the object side surface of the fourth lens satisfy: 1.3< DT41/DT31< 1.6. By constraining this conditional expression, it is advantageous to control the relative sizes of the third lens and the fourth lens to be small.

Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on the imaging surface.

The optical imaging lens in the present application may employ a plurality of lenses, for example, four lenses as described above. By reasonably distributing the focal power, the surface shape, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the optical imaging lens is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. In 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 optical imaging lens may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although the description has been made taking four lenses as an example in the embodiment, the optical imaging lens is not limited to include four lenses. The optical imaging lens may also include other numbers of lenses, as desired.

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

It should be noted that any one of the following examples one to five is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 5, an optical imaging lens of the first example of the present application is described. Fig. 1 shows a schematic diagram of an optical imaging lens structure of example one.

As shown in fig. 1, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

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

In this example, the total effective focal length f of the optical imaging lens is 1.12mm, the maximum half field angle Semi-FOV of the optical imaging lens is 40.50 °, the total length TTL of the optical imaging lens is 1.92mm, and the image height ImgH is 0.97 mm.

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

TABLE 1

In the first example, the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20 that can be used for each of the aspherical mirrors S1-S8 in example one.

Flour mark	A4	A6	A8	A10	A12
						S1	-5.5853E+00	-1.8147E-02	-3.2406E+01	1.3356E+01	-6.8748E+00
S2	2.3575E-01	5.6771E-02	-5.8619E-03	1.2091E-02	-2.8856E-04
						S3	-1.6913E+03	-2.4646E+02	-1.1566E+02	-3.4382E+01	-2.5500E+01
S4	-2.6410E-02	-5.7770E-03	-9.2201E-05	5.2289E-05	4.6438E-05
						S5	1.2570E+00	2.7096E-01	6.7164E-02	-2.0740E-01	2.2165E-02
S6	7.7559E-02	2.2201E-02	7.1390E-03	-1.9981E-03	-1.8744E-03
						S7	-4.7810E-01	9.9576E-02	-4.3170E-02	5.8136E-02	1.7377E-02
S8	-2.3637E+00	-5.8875E-01	-1.6738E-01	-2.6971E-02	-2.5769E-02
						Flour mark	A14	A16	A18	A20
S1	4.1047E+00	-2.6895E+00	1.9310E+00	-1.4571E+00
						S2	1.4924E-03	2.3325E-03	5.6631E-03	-9.0193E-04
S3	-9.3343E+00	-8.8087E+00	-3.3775E+00	-3.7833E+00
						S4	1.3699E-05	3.0322E-06	1.0118E-05	2.4172E-07
S5	6.9953E-02	-2.7542E-03	-5.1381E-02	-5.6472E-03
						S6	7.9614E-04	7.4028E-05	3.0599E-04	-1.0176E-04
S7	5.4905E-03	8.9213E-03	-1.2095E-02	1.1239E-02
						S8	4.6445E-02	1.1057E-01	7.5094E-02	2.4472E-02

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve of the optical imaging lens of example one, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 3 shows astigmatism curves of the optical imaging lens of example one, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows distortion curves of the optical imaging lens of example one, which indicate distortion magnitude values corresponding to different angles of view. Fig. 5 shows a chromatic aberration of magnification curve of the optical imaging lens of the first example, which represents a deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 2 to 5, the optical imaging lens according to the first example can achieve good imaging quality.

Example two

As shown in fig. 6 to 10, an optical imaging lens of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 6 shows a schematic diagram of the optical imaging lens structure of example two.

As shown in fig. 6, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

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

In this example, the total effective focal length f of the optical imaging lens is 1.19mm, the maximum half field angle Semi-FOV of the optical imaging lens is 40.50 °, the total length TTL of the optical imaging lens is 1.90mm, and the image height ImgH is 1.02 mm.

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

TABLE 3

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

TABLE 4

Fig. 7 shows on-axis chromatic aberration curves of the optical imaging lens of example two, which represent deviation of the convergence focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 8 shows astigmatism curves of the optical imaging lens of example two, which represent meridional field curvature and sagittal field curvature. Fig. 9 shows distortion curves of the optical imaging lens of example two, which represent distortion magnitude values corresponding to different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the optical imaging lens of example two, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 7 to 10, the optical imaging lens according to the second example can achieve good imaging quality.

Example III

As shown in fig. 11 to 15, an optical imaging lens of example three of the present application is described. Fig. 11 shows a schematic diagram of an optical imaging lens structure of example three.

As shown in fig. 11, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

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

In this example, the total effective focal length f of the optical imaging lens is 1.14mm, the maximum half field angle Semi-FOV of the optical imaging lens is 40.60 °, the total length TTL of the optical imaging lens is 1.91mm, and the image height ImgH is 0.98 mm.

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

TABLE 5

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

Flour mark	A4	A6	A8	A10	A12
						S1	-6.2934E-03	1.3065E-02	9.5140E-04	-2.9591E-03	-1.6330E-03
S2	-1.7008E-01	-5.7081E-02	-3.1529E-04	2.0370E-02	-9.8920E-04
						S3	1.0595E+01	4.2714E+00	-3.2689E+00	-1.8732E+00	1.5779E+00
S4	-1.7241E-02	-3.2809E-03	1.7122E-04	5.2435E-05	5.5447E-05
						S5	2.0698E-01	-7.5700E-01	-2.4413E-02	1.0824E-01	4.1156E-02
S6	7.9596E-02	1.7072E-02	8.9529E-03	-1.7301E-03	-9.6186E-04
						S7	-1.0198E+00	2.6929E-02	-1.3642E-01	7.9913E-02	-3.6973E-04
S8	-2.6067E+00	-6.3121E-01	-2.2661E-01	3.5982E-02	2.2947E-02
						Flour mark	A14	A16	A18	A20
S1	3.5358E-05	4.0971E-04	2.1259E-04	4.5367E-05
						S2	2.6329E-03	4.1590E-03	3.0513E-03	-1.2691E-04
S3	1.2035E+00	-2.6041E-01	-3.6773E-01	-5.3804E-02
						S4	4.0323E-06	1.3194E-05	1.2348E-05	5.1625E-06
S5	-1.2746E-02	5.7021E-03	-1.4690E-02	-1.7109E-03
						S6	2.3953E-05	3.5293E-05	6.1138E-05	5.8913E-07
S7	-2.2595E-03	-4.2559E-03	-3.0438E-03	1.9711E-02
						S8	5.7271E-02	8.1783E-02	5.5067E-02	1.7724E-02

TABLE 6

Fig. 12 shows an on-axis chromatic aberration curve of the optical imaging lens of example three, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 13 shows astigmatism curves of the optical imaging lens of example three, which represent meridional field curvature and sagittal field curvature. Fig. 14 shows distortion curves of the optical imaging lens of example three, which represent distortion magnitude values corresponding to different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the optical imaging lens of example three, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 12 to 15, the optical imaging lens according to the third example can achieve good imaging quality.

Example four

As shown in fig. 16 to 20, an optical imaging lens of example four of the present application is described. Fig. 16 shows a schematic diagram of an optical imaging lens structure of example four.

As shown in fig. 16, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

In this example, the total effective focal length f of the optical imaging lens is 1.12mm, the maximum half field angle Semi-FOV of the optical imaging lens is 40.00 °, the total length TTL of the optical imaging lens is 1.93mm, and the image height ImgH is 0.96 mm.

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

TABLE 7

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

TABLE 8

Fig. 17 shows on-axis chromatic aberration curves of the optical imaging lens of example four, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the optical imaging lens. Fig. 18 shows astigmatism curves of the optical imaging lens of example four, which represent meridional field curvature and sagittal field curvature. Fig. 19 shows distortion curves of the optical imaging lens of example four, which represent distortion magnitude values corresponding to different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the optical imaging lens of example four, which represents a deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 17 to 20, the optical imaging lens according to example four can achieve good imaging quality.

Example five

As shown in fig. 21 to 25, an optical imaging lens of example five of the present application is described. Fig. 21 shows a schematic diagram of an optical imaging lens structure of example five.

As shown in fig. 21, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

In this example, the total effective focal length f of the optical imaging lens is 1.17mm, the maximum half field angle Semi-FOV of the optical imaging lens is 40.20 °, the total length TTL of the optical imaging lens is 1.90mm, and the image height ImgH is 1.00 mm.

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

TABLE 9

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

Flour mark	A4	A6	A8	A10	A12
						S1	-6.4772E-03	1.7203E-02	-1.6725E-03	-6.0332E-03	-2.4465E-03
S2	-1.1696E-01	-3.2439E-02	1.8107E-02	2.5844E-02	-7.4708E-03
						S3	2.7442E+08	5.1230E+07	8.5313E+06	6.1229E+06	-4.0189E+06
S4	-3.0360E-02	-3.7251E-03	-1.4621E-04	2.0794E-05	-2.9538E-07
						S5	-5.6547E-01	-6.5390E-01	-8.4913E-02	1.0934E-01	6.3518E-02
S6	7.9408E-02	1.2941E-02	5.7820E-03	4.3025E-05	-1.3819E-03
						S7	-1.2305E+00	-6.3433E-02	-9.6059E-02	1.2695E-01	-1.4594E-02
S8	-4.8045E+00	-8.2127E-01	-1.3818E-01	1.7974E-01	-4.6540E-02
						Flour mark	A14	A16	A18	A20
S1	8.0563E-04	1.1834E-03	5.0058E-04	8.4061E-05
						S2	3.3632E-03	5.9095E-03	4.0946E-03	5.2377E-04
S3	-2.9066E+06	-7.4806E+05	-4.3292E+05	-3.0884E+05
						S4	-1.5250E-06	3.1658E-07	1.1353E-06	5.8885E-07
S5	-2.8834E-02	9.2395E-03	-1.2979E-02	-4.2917E-03
						S6	1.7936E-04	-7.1068E-05	1.1718E-04	2.7717E-06
S7	-1.2731E-02	-8.2782E-03	4.8846E-03	2.7565E-02
						S8	3.2459E-02	8.8403E-02	6.8677E-02	1.5898E-02

Watch 10

Fig. 22 shows an on-axis chromatic aberration curve of the optical imaging lens of example five, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 23 shows astigmatism curves of the optical imaging lens of example five, which represent meridional field curvature and sagittal field curvature. Fig. 24 shows distortion curves of the optical imaging lens of example five, which represent distortion magnitude values corresponding to different angles of view. Fig. 25 shows a chromatic aberration of magnification curve of the optical imaging lens of example five, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 22 to 25, the optical imaging lens according to example five can achieve good imaging quality.

To sum up, examples one to five respectively satisfy the relationships shown in table 11.

Table 11 table 12 gives effective focal lengths f of the optical imaging lenses of example one to example five, and effective focal lengths f1 to f5 of the respective lenses.

Example parameters	1	2	3	4	5
						f1(mm)	-3.68	-2.53	-3.15	-2.32	-2.72
f2(mm)	1.03	0.93	0.99	0.89	0.97
						f3(mm)	2.81	2.30	3.39	2.51	2.52
f4(mm)	-15.33	-3.11	-63.37	-5.21	-4.94
						f12(mm)	1.78	1.69	1.76	1.70	1.74
f23(mm)	0.94	0.87	0.94	0.84	0.89
						f34(mm)	2.56	4.58	2.75	3.17	3.44
f123(mm)	1.39	1.25	1.45	1.29	1.31
						f234(mm)	0.74	0.73	0.73	0.68	0.74
f(mm)	1.12	1.19	1.14	1.12	1.17
						TTL(mm)	1.92	1.90	1.91	1.93	1.90
ImgH(mm)	0.97	1.02	0.98	0.96	1.00
						Semi-FOV(°)	40.50	40.50	40.60	40.00	40.20

TABLE 12

The present application also provides an imaging device comprising an electron-sensitive element, which may be a photo-coupled device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

It is to be understood that the above-described embodiments are only a few, and not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

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

Claims

1. An optical imaging lens, comprising, in order from an object side to an image side:

a first lens having a negative optical power;

the second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface;

a third lens having a positive optical power;

a fourth lens having a negative optical power;

the number of the lenses of the optical imaging lens with focal power is four;

wherein, the maximum effective radius 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 satisfy: DT11/ImgH < 0.4; the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following conditions: f/EPD <2.

2. The optical imaging lens of claim 1, wherein a maximum effective radius DT11 of the object side surface of the first lens and an aperture value fno of the optical imaging lens satisfy: DT11/fno <0.2 mm.

3. The optical imaging lens of claim 1, wherein the on-axis distance TTL from the object-side surface of the first lens element to the imaging surface satisfies: TTL <2 mm.

4. The optical imaging lens of claim 1, wherein an on-axis distance SL from a diaphragm to an imaging plane and an on-axis distance TTL from an object side surface of the first lens to the imaging plane satisfy: 0.9< SL/TTL <1.

5. The optical imaging lens of claim 1, wherein the effective focal length f of the optical imaging lens, the half ImgH of the diagonal length of the effective pixel area on the imaging plane, and the half Semi-FOV of the maximum field angle of the optical imaging lens satisfy: 0.9< f/ImgH tan (Semi-FOV) < 1.1.

6. The optical imaging lens of claim 1, wherein an on-axis distance TTL from an object-side surface of the first lens element to the imaging surface and an on-axis distance TD from the object-side surface of the first lens element to an image-side surface of the fourth lens element satisfy: 0.7< TD/TTL < 0.8.

7. The optical imaging lens of claim 1, wherein the length ImgH of the diagonal of the effective pixel area on the imaging plane, the on-axis distance SL from the diaphragm to the imaging plane, and the aperture value fno of the optical imaging lens satisfy: 0.9< ImgH × fno/SL < 1.1.

8. The optical imaging lens of claim 1, wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.5< (f1-f2)/(f2-f3) <3.

9. The optical imaging lens of claim 1, wherein an effective focal length f of the optical imaging lens, a combined focal length f12 of the first and second lenses, and a combined focal length f23 of the second and third lenses satisfy: 0.6< (f12-f23)/f < 0.8.

10. The optical imaging lens of claim 1, wherein a combined focal length f12 of the first and second lenses, a combined focal length f34 of the third and fourth lenses, and an effective focal length f of the optical imaging lens satisfy: 3.5< (f12+ f34)/f < 5.5.

11. The optical imaging lens of claim 1, wherein a combined focal length f123 of the first lens, the second lens and the third lens and a combined focal length f234 of the second lens, the third lens and the fourth lens satisfy: 0.5< f234/f123< 0.6.

12. The optical imaging lens of claim 1, wherein a radius of curvature R1 of the object-side surface of the first lens, a radius of curvature R2 of the image-side surface of the first lens, a radius of curvature R7 of the object-side surface of the fourth lens, and a radius of curvature R8 of the image-side surface of the fourth lens satisfy: 2.5< (R1-R2)/(R7-R8) < 4.

13. The optical imaging lens according to claim 1, wherein a sum Σ AT of air spaces on an optical axis between adjacent two lenses of the first to fourth lenses, a sum Σ CT of center thicknesses on the optical axis of the first to fourth lenses, and a distance BFL on the optical axis from an image side surface of the fourth lens to the imaging surface satisfy: 0.4< (∑ AT + BFL)/. Σ CT < 0.7.

14. The optical imaging lens according to claim 1, characterized in that a sum Σ AT of air intervals on an optical axis between adjacent two lenses among the first to fourth lenses and an air interval T23 on the optical axis between the second lens and the third lens satisfy: 0.9< T23/∑ AT.

15. The optical imaging lens of claim 1, characterized in that the first lens passesMaximum center thickness CT of mirror to the fourth lens on the optical axis _MAX A minimum center thickness CT on the optical axis with the first lens to the fourth lens _MIN Satisfies the following conditions: 1.9<CT _MAX /CT _MIN <2.1。

16. The optical imaging lens of claim 1, wherein a center thickness CT1 of the first lens on an optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.7< (CT1+ CT2)/(CT3+ CT4) < 0.9.

17. The optical imaging lens of claim 1, wherein the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT21 of the object side surface of the second lens, and the maximum effective radius DT41 of the object side surface of the fourth lens satisfy: 0< (DT21-DT11)/(DT41-DT11) < 0.1.

18. The optical imaging lens of claim 1, characterized in that the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT41 of the object side surface of the fourth lens and the maximum effective radius SR of the diaphragm satisfy: 1< (DT41-DT11)/SR < 1.5.

19. The optical imaging lens of claim 1, wherein a maximum effective radius DT31 of an object side surface of the third lens and a maximum effective radius DT41 of an object side surface of the fourth lens satisfy: 1.3< DT41/DT31< 1.6.

20. The optical imaging lens of claim 1, wherein a center thickness CT1 of the first lens on an optical axis and an edge thickness ET1 of the first lens satisfy: 0.9< CT1/ET1< 1.

21. The optical imaging lens according to claim 1, characterized in that the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens and the edge thickness ET4 of the fourth lens satisfy: 0.8< (ET2+ ET3)/ET4< 1.2.

22. An optical imaging lens, comprising, in order from an object side to an image side:

a first lens having a negative optical power;

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

a third lens having a positive optical power;

a fourth lens having a negative optical power;

the number of the lenses with focal power of the optical imaging lens is four; wherein, the maximum effective radius 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 satisfy: DT11/ImgH < 0.4; half of the diagonal length ImgH of the effective pixel area on the imaging surface, the on-axis distance SL from the diaphragm to the imaging surface and the aperture value fno of the optical imaging lens satisfy the following conditions: 0.9< ImgH × fno/SL < 1.1.

23. The optical imaging lens of claim 22, wherein an effective focal length f of the optical imaging lens and an entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 2; the maximum effective radius DT11 of the object side surface of the first lens and the aperture value fno of the optical imaging lens satisfy the following condition: DT11/fno <0.2 mm.

24. The optical imaging lens of claim 22, wherein the on-axis distance TTL from the object-side surface of the first lens element to the imaging surface satisfies: TTL <2 mm.

25. The optical imaging lens of claim 22, wherein an on-axis distance SL from a diaphragm to an imaging plane and an on-axis distance TTL from an object side surface of the first lens to the imaging plane satisfy: 0.9< SL/TTL <1.

26. The optical imaging lens of claim 22, wherein the effective focal length f of the optical imaging lens, the half ImgH of the diagonal length of the effective pixel area on the imaging plane, and the half Semi-FOV of the maximum field angle of the optical imaging lens satisfy: 0.9< f/ImgH tan (Semi-FOV) < 1.1.

27. The optical imaging lens of claim 22, wherein an on-axis distance TTL between an object-side surface of the first lens element and the imaging plane and an on-axis distance TD between the object-side surface of the first lens element and an image-side surface of the fourth lens element satisfy: 0.7< TD/TTL < 0.8.

28. The optical imaging lens of claim 22, wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.5< (f1-f2)/(f2-f3) <3.

29. The optical imaging lens of claim 22, wherein an effective focal length f of the optical imaging lens, a combined focal length f12 of the first and second lenses, and a combined focal length f23 of the second and third lenses satisfy: 0.6< (f12-f23)/f < 0.8.

30. The optical imaging lens of claim 22, wherein a combined focal length f12 of the first and second lenses, a combined focal length f34 of the third and fourth lenses, and an effective focal length f of the optical imaging lens satisfy: 3.5< (f12+ f34)/f < 5.5.

31. The optical imaging lens of claim 22, wherein a combined focal length f123 of the first lens, the second lens and the third lens and a combined focal length f234 of the second lens, the third lens and the fourth lens satisfy: 0.5< f234/f123< 0.6.

32. The optical imaging lens of claim 22, wherein the radius of curvature of the object-side surface of the first lens R1, the radius of curvature of the image-side surface of the first lens R2, the radius of curvature of the object-side surface of the fourth lens R7, and the radius of curvature of the image-side surface of the fourth lens R8 satisfy: 2.5< (R1-R2)/(R7-R8) < 4.

33. The optical imaging lens according to claim 22, wherein a sum Σ AT of air spaces on an optical axis between adjacent two lenses among the first to fourth lenses, a sum Σ CT of center thicknesses on the optical axis of the first to fourth lenses, and a distance BFL on the optical axis from an image side surface of the fourth lens to the imaging surface satisfy: 0.4< (∑ AT + BFL)/. Σ CT < 0.7.

34. The optical imaging lens according to claim 22, wherein a sum Σ AT of air intervals on an optical axis between adjacent two lenses among the first to fourth lenses and an air interval T23 on the optical axis between the second lens and the third lens satisfy: 0.9< T23/∑ AT.

35. The optical imaging lens of claim 22, wherein the maximum central thickness CT of the first to fourth lenses on the optical axis _MAX A minimum center thickness CT on the optical axis with the first lens to the fourth lens _MIN Satisfies the following conditions: 1.9<CT _MAX /CT _MIN <2.1。

36. The optical imaging lens of claim 22, wherein a center thickness CT1 of the first lens on an optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.7< (CT1+ CT2)/(CT3+ CT4) < 0.9.

37. The optical imaging lens of claim 22, wherein the maximum effective radius DT11 of the object-side surface of the first lens, the maximum effective radius DT21 of the object-side surface of the second lens, and the maximum effective radius DT41 of the object-side surface of the fourth lens satisfy: 0< (DT21-DT11)/(DT41-DT11) < 0.1.

38. The optical imaging lens of claim 22, wherein the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT41 of the object side surface of the fourth lens, and the maximum effective radius SR of the stop satisfy: 1< (DT41-DT11)/SR < 1.5.

39. The optical imaging lens of claim 22, wherein the maximum effective radius DT31 of the object side surface of the third lens and the maximum effective radius DT41 of the object side surface of the fourth lens satisfy: 1.3< DT41/DT31< 1.6.

40. The optical imaging lens of claim 22, wherein a center thickness CT1 of the first lens on an optical axis and an edge thickness ET1 of the first lens satisfy: 0.9< CT1/ET1< 1.

41. The optical imaging lens of claim 22, wherein the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, and the edge thickness ET4 of the fourth lens satisfy: 0.8< (ET2+ ET3)/ET4< 1.2.