CN214669826U

CN214669826U - Optical imaging lens

Info

Publication number: CN214669826U
Application number: CN202120847929.3U
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: 2021-04-23
Filing date: 2021-04-23
Publication date: 2021-11-09
Anticipated expiration: 2031-04-23

Abstract

The utility model provides an optical imaging lens. The imaging lens sequentially comprises the following components from the object side of the imaging lens to the image side of the imaging lens along the optical axis: a flat glass; the image side surface of the first lens is a concave surface; a second lens; a third lens; a fourth lens having a negative focal power; wherein, half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfies: Semi-FOV >40 °; the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy the following conditions: -1.0< f34/f12< -0.5. The utility model provides an optical imaging lens have the problem that the detail picture is taken unclear among the prior art.

Description

Optical imaging lens

Technical Field

The utility model relates to an optical imaging equipment technical field particularly, relates to an optical imaging camera lens.

Background

With the popularization and use of mobile phones, the application of the mobile phones is rapidly developed, the requirements of users on mobile phone shooting are higher and higher, and the requirements of the users on the mobile phones are not limited to single shooting functions any more. When a user takes a picture, when the lens is close to an object, the user cannot take a clear picture, and therefore, a detailed picture cannot be taken easily in the process of taking a picture by a mobile phone in the prior art.

That is to say, the optical imaging lens in the prior art has the problem that the detailed image shooting is unclear.

SUMMERY OF THE UTILITY MODEL

The main object of the utility model is to provide an optical imaging lens to there is the problem that the detail picture shooting is unclear in the optical imaging lens among the solution prior art.

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 along an optical axis from an object side of the optical imaging lens to an image side of the optical imaging lens: a flat glass; the image side surface of the first lens is a concave surface; a second lens; a third lens; a fourth lens having a negative focal power; wherein, half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfies: Semi-FOV >40 °; the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy the following conditions: -1.0< f34/f12< -0.5.

Further, the magnification M of the optical imaging lens satisfies: 0.3< M < 1.0.

Further, an on-axis distance TOL of the object to be photographed to the object side surface of the first lens satisfies: 0mm < TOL <32.0 mm.

Further, an on-axis distance TTL2 from the object-side surface of the first lens element to the imaging surface of the optical imaging lens when the optical imaging lens is in the maximum object distance state and a maximum on-axis distance TOL2 from the object to the object-side surface of the first lens element when the optical imaging lens is in the maximum object distance state satisfy: 3.0< TOL2/TTL2< 8.0.

Further, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: -0.8< f/f1< -0.3.

Further, an air interval T12 between the first lens and the second lens on the optical axis and a distance BFL2 between the image side surface of the fourth lens and the imaging surface of the optical imaging lens on the optical axis when the optical imaging lens is in the maximum object distance state satisfy: 0< T12/BFL2< 1.0.

Further, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: 0.5< (f4+ f3)/(f4-f3) < 1.0.

Further, an on-axis distance SAG12 between an intersection point of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens and an edge thickness ET1 of the first lens satisfies: 0.5< SAG12/ET1< 1.0.

Further, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT41 of the object side surface of the fourth lens satisfy: 0.3< DT41/DT11< 0.8.

Further, 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: 0.5< ET2/(ET3+ ET4) < 1.0.

Further, a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R2 of the image-side surface of the first lens satisfy: 0< (R1-R2)/(R1+ R2) < 1.0.

Further, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, and the effective focal length f2 of the second lens satisfy: -0.8< (R3+ R4)/f2< -0.3.

Further, a radius of curvature R5 of the object-side surface of the third lens, a radius of curvature R6 of the image-side surface of the third 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 0.5< (R7+ R8)/(R5-R6) < 1.0.

Further, 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 sum Σ CT of the thicknesses of the first lens to the fourth lens on the optical axis, respectively, satisfy: 0.5< (CT2+ CT 3)/sigma CT < 1.0.

Furthermore, the first lens has negative focal power, and the object side surface of the first lens is a convex surface; the second 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 concave surface; the third lens has negative focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface.

According to another aspect of the present invention, there is provided an optical imaging lens, comprising, in order from an object side of the optical imaging lens to an image side of the optical imaging lens along an optical axis: a flat glass; the image side surface of the first lens is a concave surface; a second lens; a third lens; a fourth lens; the fourth lens has negative focal power; wherein, half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfies: Semi-FOV >40 °; the on-axis distance TTL2 between the object side surface of the first lens and the imaging surface of the optical imaging lens in the maximum object distance state of the optical imaging lens and the maximum on-axis distance TOL2 between the object to the object side surface of the first lens in the maximum object distance state of the optical imaging lens satisfy the following conditions: 3.0< TOL2/TTL2< 8.0.

By applying the technical scheme of the utility model, the lens comprises a plane glass, a first lens, a second lens, a third lens and a fourth lens in sequence from the object side of the optical imaging lens to the image side of the optical imaging lens along the optical axis, and the image side surface of the first lens is a concave surface; the fourth lens has negative focal power; wherein, half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfies: Semi-FOV >40 °; the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy the following conditions: -1.0< f34/f12< -0.5.

The plane glass is arranged on the object side of the first lens, so that the plane glass can protect the rear lens, meanwhile, the image side surface of the first lens is set to be a concave surface, the fourth lens is set to be negative focal power, and on the premise that light rays have good convergence, the optical imaging lens can shoot more delicate things, the application range of the optical imaging lens is widened, and meanwhile, the optical imaging lens can obtain clearer pictures when a detail picture is shot. By adjusting the Semi-FOV within a proper range, the imaging height of the optical imaging lens can be improved, and meanwhile, overlarge aberration of the marginal field of view can be avoided, so that the characteristics of wide imaging range and high imaging quality of the optical imaging lens can be better kept. By reasonably adjusting the ratio of the combined focal length of the third lens and the fourth lens to the combined focal length of the first lens and the second lens, on one hand, the focal power of the optical imaging lens can be more reasonably distributed, and the distortion and astigmatism of the whole optical system can be better balanced.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments 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 structural diagram 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 structural view 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 of an optical imaging lens according to a third example 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 structural view of an optical imaging lens according to a fourth example 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 structural view of an optical imaging lens according to 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.

Fig. 26 is a schematic structural view of an optical imaging lens according to a sixth example of the present invention;

fig. 27 to 30 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. 26.

Wherein the figures include the following reference numerals:

p, plane glass; p1, object side of flat glass; p2, image side of plane glass; 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 accompanying drawings in conjunction with embodiments.

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 application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; 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. For the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface 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.

In order to solve the problem that the optical imaging lens in the prior art has the problem that the detailed picture is unclear, the utility model provides an optical imaging lens.

Example one

As shown in fig. 1 to fig. 30, the optical imaging lens includes, in order from an object side to an image side, a planar glass, a first lens element, a second lens element, a third lens element and a fourth lens element, wherein an image-side surface of the first lens element is a concave surface; the fourth lens has negative focal power; wherein, half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfies: Semi-FOV >40 °; the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy the following conditions: -1.0< f34/f12< -0.5.

The plane glass is arranged on the object side of the first lens, so that the plane glass can protect the lens behind the first lens, meanwhile, the image side surface of the first lens is set to be the concave surface, the fourth lens is set to be the negative focal power, and on the premise that light rays have good convergence, the optical imaging lens can shoot more delicate things, the application range of the optical imaging lens is widened, and meanwhile, the optical imaging lens can obtain clearer pictures when a detail picture is shot. By adjusting the Semi-FOV within a proper range, the imaging height of the optical imaging lens can be improved, and meanwhile, overlarge aberration of the marginal field of view can be avoided, so that the characteristics of wide imaging range and high imaging quality of the optical imaging lens can be better kept. By reasonably adjusting the ratio of the combined focal length of the third lens and the fourth lens to the combined focal length of the first lens and the second lens, on one hand, the focal power of the optical imaging lens can be more reasonably distributed, and the distortion and astigmatism of the whole optical system can be better balanced.

Preferably, half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfies: 40 ° < Semi-FOV <50 °; the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy the following conditions: -0.9< f34/f12< -0.7.

In the present embodiment, the magnification M of the optical imaging lens satisfies: 0.3< M < 1.0. The high pixel of the optical imaging system is realized by restricting the magnification of the optical imaging lens, so that the optical imaging lens can be better matched with electronic products which take pictures more clearly in the market.

In the present embodiment, the on-axis distance TOL from the object to the object-side surface of the first lens satisfies: 0mm < TOL <32.0 mm. The arrangement is favorable for ensuring that the magnification and the field angle of the whole optical imaging system are in a reasonable range, the problem that the microscopic shooting effect cannot be achieved due to the fact that the magnification is small because the field angle is too large is avoided, and the effect that the optical imaging lens can realize microscopic shooting is ensured. Preferably, 3mm < TOL <31.0 mm.

In this embodiment, the on-axis distance TTL2 from the object-side surface of the first lens element to the imaging surface of the optical imaging lens in the maximum object distance state of the optical imaging lens and the maximum on-axis distance TOL2 from the object to the object-side surface of the first lens element in the maximum object distance state of the optical imaging lens satisfy: 3.0< TOL2/TTL2< 8.0. By enabling the optical imaging lens to meet 3.0< TOL2/TTL2<8.0, the imaging device is beneficial to enabling the optical imaging lens to clearly image when being used in a macro working environment, ensures the imaging quality when the optical imaging lens is used for macro shooting, is beneficial to reducing the total length of the optical imaging lens and is beneficial to the miniaturization of the optical imaging lens. Preferably, 5< TOL2/TTL2<8.

In the present embodiment, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: -0.8< f/f1< -0.3. The field curvature aberration of the optical imaging lens is effectively corrected by reasonably distributing the focal power of the first lens, and the imaging quality of the optical imaging lens is improved. Preferably, -0.7< f/f1< -0.5.

In the present embodiment, an air interval T12 between the first lens and the second lens on the optical axis and a distance BFL2 between the image-side surface of the fourth lens and the imaging surface of the optical imaging lens on the optical axis when the optical imaging lens is in the maximum object distance state satisfy: 0< T12/BFL2< 1.0. By reasonably controlling the ratio of the air interval of the first lens and the second lens on the optical axis to the distance from the image side surface of the fourth lens to the imaging surface on the optical axis, the size of the optical imaging lens can be effectively reduced, the miniaturization of the optical imaging lens is guaranteed, and the field curvature and distortion of the system can be improved. Preferably, 0.5< T12/BFL2< 0.9.

In the present embodiment, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: 0.5< (f4+ f3)/(f4-f3) < 1.0. By reasonably adjusting (f4+ f3)/(f4-f3) within a reasonable range, on one hand, the focal power of the optical imaging lens can be more reasonably distributed, which is beneficial to improving the imaging quality of the optical imaging lens and reducing the sensitivity of the optical imaging lens. Preferably, 0.6< (f4+ f3)/(f4-f3) < 0.9.

In the present embodiment, an on-axis distance SAG12 between an intersection point of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens and an edge thickness ET1 of the first lens satisfies: 0.5< SAG12/ET1< 1.0. The incidence angle of chief rays on the imaging surface of the optical imaging lens can be reduced by the arrangement, meanwhile, the incidence angle of marginal rays of the maximum view field on the object side surface of the lens closest to the imaging surface is effectively controlled, and when the slope change of the object side surface of the first lens is large, the reflection energy caused by uneven coating is reduced, stray light is avoided, and the imaging quality of the optical imaging lens is ensured. Preferably, 0.7< SAG12/ET1< 1.0.

In the present embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT41 of the object-side surface of the fourth lens satisfy: 0.3< DT41/DT11< 0.8. The size of the optical imaging lens is favorably reduced by controlling the maximum effective radius of the object side surface of the first lens and the maximum effective radius of the image side surface of the fourth lens. When the optical imaging lens is arranged on the mobile terminal, a smaller installation space can be occupied, and the miniaturization and the lightness and thinness of the mobile terminal are facilitated. Preferably 0.4< DT41/DT11< 0.7.

In the present embodiment, 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: 0.5< ET2/(ET3+ ET4) < 1.0. By controlling ET2/(ET3+ ET4) within a reasonable range, the edge thicknesses of the second lens, the third lens and the fourth lens are reasonably distributed, the longitudinal spherical aberration of the optical imaging system and ghost images of edge image surfaces are improved, meanwhile, the stability of the optical imaging lens can be enhanced, and the optical imaging lens can stably work. Preferably, 0.55< ET2/(ET3+ ET4) < 0.95.

In the present embodiment, a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R2 of the image-side surface of the first lens satisfy: 0< (R1-R2)/(R1+ R2) < 1.0. The arrangement enables the image side surface of the first lens to have proper curvature so as to control the angle of light rays entering the imaging surface, and is beneficial to controlling the shape of the first lens, so that the first lens has good manufacturability. Preferably, 0.4< (R1-R2)/(R1+ R2) < 0.6.

In the present embodiment, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, and the effective focal length f2 of the second lens satisfy: -0.8< (R3+ R4)/f2< -0.3. By controlling (R3+ R4)/f2 within a reasonable range, the focal power value near the aperture of the second lens is reduced, the focal powers of the lenses can be effectively balanced, and the imaging quality of the optical imaging lens is ensured. Preferably, -0.7< (R3+ R4)/f2< -0.4.

In the present embodiment, a radius of curvature R5 of the object-side surface of the third lens, a radius of curvature R6 of the image-side surface of the third 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 0.5< (R7+ R8)/(R5-R6) < 1.0. By controlling (R7+ R8)/(R5-R6) within a reasonable range, the curvature radius of the third lens and the curvature radius of the fourth lens are controlled, the third lens and the fourth lens can effectively have better convergence effect on marginal field rays, the image quality of the optical imaging lens is improved, and great help is brought to the improvement of the relative illumination of the optical imaging system; meanwhile, the second lens can keep good processing manufacturability, and the practicability of the optical imaging lens is improved. Preferably, 0.6< (R7+ R8)/(R5-R6) < 0.8.

In the present embodiment, 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 sum Σ CT of the thicknesses of the first lens to the fourth lens on the optical axis, respectively, satisfy: 0.5< (CT2+ CT 3)/sigma CT < 1.0. By controlling the ratio of the sum of the central thicknesses of the second lens and the third lens to the sum of the central thicknesses of the first lens to the fourth lens within a reasonable range, the thickness sensitivity and tolerance sensitivity of the optical imaging lens can be reduced. Preferably, 0.6< (CT2+ CT3)/Σ CT < 0.8.

In this embodiment, the first lens has a negative focal power, and the object-side surface of the first lens is a convex surface; the second 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 concave surface; the third lens has negative focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface. The second lens with negative focal power, the object side surface of which is a concave surface and the second lens with negative focal power, the object side surface of which is a convex surface and the image side surface of which is a convex surface bear the function of light convergence, and the third lens with positive focal power and the fourth lens with the object side surface of which is a convex surface and the image side surface of which is a concave surface can effectively reduce aberration and ensure the imaging quality of the lens of the optical imager by matching with the two lenses at the back to furthest improve the focal length on the premise of keeping good convergence of light.

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.

Example two

As shown in fig. 1 to 30, the optical imaging lens includes, in order from an object side to an image side, a planar glass, a first lens, a second lens, a third lens, and a fourth lens; the image side surface of the first lens is a concave surface; the fourth lens has negative focal power; wherein, half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfies: Semi-FOV >40 °; the on-axis distance TTL2 between the object side surface of the first lens and the imaging surface of the optical imaging lens in the maximum object distance state of the optical imaging lens and the maximum on-axis distance TOL2 between the object to the object side surface of the first lens in the maximum object distance state of the optical imaging lens satisfy the following conditions: 3.0< TOL2/TTL2< 8.0.

The plane glass is arranged on the object side of the first lens, so that the plane glass can protect the rear lens, meanwhile, the image side surface of the first lens is set to be a concave surface, the fourth lens is set to be negative focal power, and on the premise that light rays have good convergence, the optical imaging lens can shoot more delicate things, the application range of the optical imaging lens is widened, and meanwhile, the optical imaging lens can obtain clearer pictures when a detail picture is shot. By adjusting the Semi-FOV within a proper range, the imaging height of the optical imaging lens can be improved, and meanwhile, overlarge aberration of the marginal field of view can be avoided, so that the characteristics of wide imaging range and high imaging quality of the optical imaging lens can be better kept. By enabling the optical imaging lens to meet 3.0< TOL2/TTL2<8.0, the imaging device is beneficial to enabling the optical imaging lens to clearly image when being used in a macro working environment, ensures the imaging quality when the optical imaging lens is used for macro shooting, is beneficial to reducing the total length of the optical imaging lens and is beneficial to the miniaturization of the optical imaging lens.

Preferably, half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfies: 40 ° < Semi-FOV <50 °; the on-axis distance TTL2 between the object side surface of the first lens and the imaging surface of the optical imaging lens in the maximum object distance state of the optical imaging lens and the maximum on-axis distance TOL2 between the object to the object side surface of the first lens in the maximum object distance state of the optical imaging lens satisfy the following conditions: 5< TOL2/TTL2<8.

The optical imaging lens can shoot tiny things such as flowers, birds, fishes and insects, details can be fully displayed, and users can freely express the originality of the users in the aspects of topic selection, composition and light utilization, so that the mobile phone with the optical imaging lens has higher cost performance. 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. The optical imaging lens also has large aperture and large field angle. The advantages of ultra-thin and good imaging quality can meet the miniaturization requirement of intelligent electronic products.

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 four lenses are exemplified in the embodiment, the optical imaging lens is not limited to including 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 six 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 view 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: the lens comprises a plane glass P, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface 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 negative power, and the object-side surface S3 of the second lens element is convex and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element are 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. Light from the object sequentially passes through the object side P1 of the planar glass and the image side P2 of the planar glass, and the 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 1.56 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, and the focal length are all millimeters (mm).

TABLE 1

In example one, 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 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, A22, A24, A26 that can be used for each of the aspherical mirrors S1-S14 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

S1

-1.0812E-01

2.0384E-02

7.0611E-01

-2.5744E+00

5.3410E+00

-7.2749E+00

S2

-5.4294E-01

3.8544E+00

-3.5057E+01

2.1459E+02

-8.8009E+02

2.4758E+03

S3

-3.0948E-01

-5.6712E+00

2.1094E+02

-5.2585E+03

8.4558E+04

-9.0468E+05

S4

-3.4492E-01

-2.4208E-01

5.7871E+00

-2.2584E+02

3.6602E+03

-3.5126E+04

S5

-8.3191E-02

9.0044E-02

-3.0063E+00

2.9909E+01

-2.2024E+02

1.1652E+03

S6

-3.7927E-01

1.3395E+00

-1.5745E+00

-2.0790E+01

2.0479E+02

-9.3786E+02

S7

-1.3757E+00

5.6830E+00

-1.2653E+02

1.6296E+03

-1.3347E+04

7.3560E+04

S8

-1.1562E+00

-3.5463E+00

3.8283E+01

-2.3689E+02

1.0290E+03

-3.1498E+03

Flour mark

A16

A18

A20

A22

A24

A26

S1

6.6717E+00

-4.0970E+00

1.6350E+00

-3.9633E-01

5.0262E-02

-2.2039E-03

S2

-4.8325E+03

6.5252E+03

-5.9715E+03

3.5313E+03

-1.2166E+03

1.8537E+02

S3

6.4999E+06

-3.0981E+07

9.3921E+07

-1.6387E+08

1.2523E+08

0.0000E+00

S4

2.2037E+05

-9.2739E+05

2.5942E+06

-4.6233E+06

4.7468E+06

-2.1354E+06

S5

-4.1993E+03

9.9232E+03

-1.4534E+04

1.1490E+04

-2.8277E+03

-1.1359E+03

S6

2.4505E+03

-3.4894E+03

1.7151E+03

1.9421E+03

-3.0003E+03

1.1153E+03

S7

-2.7911E+05

7.3068E+05

-1.2967E+06

1.4893E+06

-9.9866E+05

2.9686E+05

S8

6.6885E+03

-9.5940E+03

8.8144E+03

-4.6178E+03

9.8043E+02

5.3505E+01

TABLE 2

Fig. 2 shows an axial chromatic aberration curve of the optical imaging lens of example one, which represents the convergent focus deviation 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 structural diagram of an optical imaging lens of example two.

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

In this example, the total effective focal length f of the optical imaging lens is 1.53 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, and the focal length 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 an on-axis chromatic aberration curve of the optical imaging lens of example two, which indicates that light rays of different wavelengths are converged to deviate from a focal point 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 indicate 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. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 11 shows a schematic view of the 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: the lens comprises a plane glass P, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 1.50 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, the thickness/distance, and the focal length 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

A

A10

A12

A14

S1

-1.5714E-01

4.1775E-01

-1.1391E+00

2.4999E+00

-3.9249E+00

4.3989E+00

S2

-5.0484E-01

2.3613E+00

-1.5984E+01

7.7877E+01

-2.6483E+02

6.3461E+02

S3

-3.7090E-01

4.7388E-01

-3.9864E+01

7.3932E+02

-7.3438E+03

2.7767E+04

S4

-2.4272E-01

-3.4713E+00

1.0562E+02

-2.2573E+03

3.0548E+04

-2.7623E+05

S5

-7.1359E-02

-1.8063E-02

-4.4601E+00

7.9715E+01

-9.6530E+02

7.7757E+03

S6

-4.1456E-01

1.5134E+00

-4.1191E+00

1.7333E+01

-2.4197E+02

2.7560E+03

S7

-1.3749E+00

6.2373E+00

-1.2982E+02

1.6520E+03

-1.3736E+04

7.7801E+04

S8

-1.1487E+00

-2.4130E+00

2.7427E+01

-1.7209E+02

7.4885E+02

-2.1939E+03

Flour mark

A16

A18

A20

A22

A24

A26

S1

-3.5442E+00

2.0406E+00

-8.1897E-01

2.1729E-01

-3.4185E-02

2.4102E-03

S2

-1.0749E+03

1.2754E+03

-1.0344E+03

5.4541E+02

-1.6826E+02

2.3033E+01

S3

1.7478E+05

-2.6654E+06

1.3812E+07

-3.4464E+07

3.4579E+07

0.0000E+00

S4

1.7135E+06

-7.3156E+06

2.1114E+07

-3.9309E+07

4.2571E+07

-2.0355E+07

S5

-4.1665E+04

1.4963E+05

-3.5653E+05

5.4102E+05

-4.7313E+05

1.8134E+05

S6

-1.8012E+04

7.1506E+04

-1.7724E+05

2.6876E+05

-2.2839E+05

8.3377E+04

S7

-3.0517E+05

8.2839E+05

-1.5264E+06

1.8213E+06

-1.2689E+06

3.9177E+05

S8

4.0240E+03

-3.7150E+03

-7.2158E+02

5.7532E+03

-5.6674E+03

1.9370E+03

TABLE 6

Fig. 12 shows an on-axis chromatic aberration curve of the optical imaging lens of example three, which represents the convergent focus deviation 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. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 16 shows a schematic view of the 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: the lens comprises a plane glass P, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

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, and the focal length are all millimeters (mm).

TABLE 7

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

TABLE 8

Fig. 17 shows an on-axis chromatic aberration curve of the optical imaging lens of example four, which represents the convergent focus deviation 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. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 21 shows a schematic view of the 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: the lens comprises a plane glass P, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 1.61 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, the thickness/distance, and the focal length 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

A14

S1

-2.0945E-01

6.7578E-01

-2.6223E+00

9.5772E+00

-2.4993E+01

4.4916E+01

S2

-3.8272E-01

1.3611E+00

-1.0619E+01

6.2886E+01

-2.4441E+02

6.3281E+02

S3

-3.5993E-01

-7.5884E-01

-4.1010E+01

1.6723E+03

-3.4829E+04

4.3705E+05

S4

-3.0320E-01

1.5508E+00

-5.2477E+01

6.5993E+02

-5.2436E+03

2.6914E+04

S5

-4.5850E-02

2.6865E-01

-8.0993E+00

4.6032E+01

4.8009E+01

-2.4747E+03

S6

-3.4115E-01

-1.5600E+00

5.9600E+01

-7.8242E+02

6.3417E+03

-3.4259E+04

S7

-1.3456E+00

5.4051E+00

-9.8828E+01

1.1540E+03

-8.9095E+03

4.7254E+04

S8

-1.2889E+00

9.2421E-01

-1.3053E+01

1.5683E+02

-1.0768E+03

4.8188E+03

Flour mark

A16

A18

A20

A22

A24

A26

S1

-5.5741E+01

4.7666E+01

-2.7566E+01

1.0290E+01

-2.2359E+00

2.1457E-01

S2

-1.1119E+03

1.3310E+03

-1.0689E+03

5.5105E+02

-1.6470E+02

2.1676E+01

S3

-3.4957E+06

1.7975E+07

-5.7582E+07

1.0459E+08

-8.2254E+07

0.0000E+00

S4

-8.1383E+04

8.4113E+04

3.3983E+05

-1.5236E+06

2.5089E+06

-1.5969E+06

S5

1.8119E+04

-7.2378E+04

1.7743E+05

-2.6608E+05

2.2451E+05

-8.1795E+04

S6

1.2666E+05

-3.2166E+05

5.5176E+05

-6.1073E+05

3.9370E+05

-1.1227E+05

S7

-1.7481E+05

4.5010E+05

-7.9032E+05

9.0170E+05

-6.0216E+05

1.7849E+05

S8

-1.4743E+04

3.1067E+04

-4.4324E+04

4.0849E+04

-2.1921E+04

5.1953E+03

Watch 10

Fig. 22 shows an on-axis chromatic aberration curve of the optical imaging lens of example five, which represents the convergent focus deviation 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.

Example six

As shown in fig. 21 to 25, an optical imaging lens of example six 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. 21 shows a schematic view of the optical imaging lens structure of example six.

In this example, the total effective focal length f of the optical imaging lens is 1.46 mm.

Table 11 shows a basic structural parameter table of the optical imaging lens of example six, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 11

Table 12 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 12

Fig. 27 shows on-axis chromatic aberration curves of the optical imaging lens of example six, which represent the convergent focus deviations of light rays of different wavelengths after passing through the optical imaging lens. Fig. 28 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical imaging lens of example six. Fig. 29 shows distortion curves of the optical imaging lens of example six, which represent distortion magnitude values corresponding to different angles of view. Fig. 30 shows a chromatic aberration of magnification curve of the optical imaging lens of example six, 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. 27 to 30, the optical imaging lens according to example six can achieve good imaging quality.

To sum up, examples one to six satisfy the relationships shown in table 13, respectively.

Conditions/examples	1	2	3	4	5	6
							f34/f12	-0.81	-0.76	-0.74	-0.77	-0.74	-0.74
TOL2/TTL2	5.86	5.93	6.01	7.83	6.46	6.41
							f/f1	-0.57	-0.54	-0.53	-0.54	-0.60	-0.58
T12/BFL2	0.59	0.70	0.74	0.69	0.52	0.85
							(f4+f3)/(f4-f3)	0.88	0.83	0.82	0.82	0.85	0.66
SAG12/ET1	0.91	0.76	0.77	0.77	0.96	0.89
							DT41/DT11	0.53	0.47	0.47	0.50	0.65	0.51
ET2/(ET3+ET4)	0.92	0.84	0.78	0.82	0.59	0.56
							(R1-R2)/(R1+R2)	0.52	0.50	0.49	0.49	0.47	0.44
(R3+R4)/f2	-0.61	-0.56	-0.53	-0.57	-0.63	-0.45
							(R7+R8)/(R5-R6)	0.61	0.62	0.62	0.62	0.63	0.70
(CT2+CT3)/ΣCT	0.72	0.67	0.65	0.67	0.68	0.65

Watch 13

Table 14 shows the effective focal lengths f of the optical imaging lenses of examples one to six, the effective focal lengths f1 to f4 of the respective lenses, the maximum half field angle Semi-FOV, the on-axis distance TTL2 from the object-side surface of the first lens to the imaging surface of the optical imaging lens in the maximum object distance state of the optical imaging lens, the image height ImgH, the aperture value Fno2 corresponding to the maximum entrance pupil of the optical imaging lens, the minimum on-axis distance TOL1 from the object to the object-side surface of the first lens in the minimum object distance state of the optical imaging lens, and the minimum on-axis distance TOL2 from the object to the object-side surface of the first lens in the maximum object distance state of the optical imaging lens.

Basic data/embodiment	1	2	3	4	5	6
							f1(mm)	-2.73	-2.83	-2.85	-2.81	-2.69	-2.51
f2(mm)	-5.70	-5.99	-6.21	-5.92	-5.68	-7.06
							f3(mm)	1.29	1.26	1.25	1.26	1.26	1.17
f4(mm)	-19.44	-13.24	-12.31	-13.11	-15.15	-5.66
							f(mm)	1.56	1.53	1.50	1.53	1.61	1.46
TTL2(mm)	5.13	5.09	5.03	3.84	4.72	4.79
							ImgH(mm)	1.94	1.94	1.94	1.94	1.94	1.94
Fno2	2.88	2.70	2.69	2.79	2.76	2.76
							Semi-FOV(°)	43.7	45.1	45.5	45.0	41.6	47.0
TOL1	3.02	3.14	3.23	3.10	3.50	3.66
							TOL2	30.02	30.14	30.23	30.10	30.50	30.67

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to 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 example 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 of the optical imaging lens along an optical axis:

a flat glass;

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

a second lens;

a third lens;

a fourth lens; the fourth lens has a negative optical power;

wherein a half Semi-FOV of a maximum field angle of the optical imaging lens satisfies: Semi-FOV >40 °;

the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy that: -1.0< f34/f12< -0.5.

2. The optical imaging lens according to claim 1, wherein the magnification M of the optical imaging lens satisfies: 0.3< M < 1.0.

3. The optical imaging lens according to claim 1, wherein an on-axis distance TOL of a subject to an object side surface of the first lens satisfies: 0mm < TOL <32.0 mm.

4. The optical imaging lens of claim 1, wherein an on-axis distance TTL2 from the object-side surface of the first lens to the imaging surface of the optical imaging lens when the optical imaging lens is in the maximum object distance state and a maximum on-axis distance TOL2 from the object to the object-side surface of the first lens when the optical imaging lens is in the maximum object distance state satisfy: 3.0< TOL2/TTL2< 8.0.

5. The optical imaging lens of claim 1, wherein the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: -0.8< f/f1< -0.3.

6. The optical imaging lens of claim 1, wherein an air interval T12 between the first lens and the second lens on the optical axis and a distance BFL2 between an image side surface of the fourth lens and an imaging surface of the optical imaging lens on the optical axis when the optical imaging lens is in a maximum object distance state satisfy: 0< T12/BFL2< 1.0.

7. The optical imaging lens of claim 1, wherein an effective focal length f3 of the third lens and an effective focal length f4 of the fourth lens satisfy: 0.5< (f4+ f3)/(f4-f3) < 1.0.

8. The optical imaging lens of claim 1, wherein an on-axis distance SAG12 between an intersection point of the image side surface of the first lens and the optical axis to an effective radius vertex of the image side surface of the first lens and an edge thickness ET1 of the first lens satisfies: 0.5< SAG12/ET1< 1.0.

9. The optical imaging lens of claim 1, wherein a maximum effective radius DT11 of an object side surface of the first lens and a maximum effective radius DT41 of an object side surface of the fourth lens satisfy: 0.3< DT41/DT11< 0.8.

10. The optical imaging lens according to claim 1, characterized in that 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: 0.5< ET2/(ET3+ ET4) < 1.0.

11. The optical imaging lens of claim 1, wherein a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R2 of the image-side surface of the first lens satisfy: 0< (R1-R2)/(R1+ R2) < 1.0.

12. The optical imaging lens of claim 1, wherein the radius of curvature of the object-side surface of the second lens, R3, the radius of curvature of the image-side surface of the second lens, R4, and the effective focal length f2 of the second lens satisfy: -0.8< (R3+ R4)/f2< -0.3.

13. The optical imaging lens of claim 1, wherein a radius of curvature R5 of the object-side surface of the third lens, a radius of curvature R6 of the image-side surface of the third 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 0.5< (R7+ R8)/(R5-R6) < 1.0.

14. The optical imaging lens of claim 1, wherein 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 sum Σ CT of the thicknesses of the first to fourth lenses on the optical axis, respectively, satisfy: 0.5< (CT2+ CT 3)/sigma CT < 1.0.

15. The optical imaging lens according to claim 1,

the first lens has negative focal power, and the object side surface of the first lens is a convex surface;

the second 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 concave surface;

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

the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface.

16. An optical imaging lens, comprising, in order from an object side to an image side of the optical imaging lens along an optical axis:

a flat glass;

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

a second lens;

a third lens;

a fourth lens; the fourth lens has a negative optical power;

the axial distance TTL2 between the object side surface of the first lens and the imaging surface of the optical imaging lens in the maximum object distance state of the optical imaging lens and the maximum axial distance TOL2 between the object to the object side surface of the first lens in the maximum object distance state of the optical imaging lens satisfy the following conditions: 3.0< TOL2/TTL2< 8.0.

17. The optical imaging lens according to claim 16, wherein the magnification M of the optical imaging lens satisfies: 0.3< M < 1.0.

18. The optical imaging lens of claim 16, wherein an on-axis distance TOL of a subject to an object side surface of the first lens satisfies: 0mm < TOL <32.0 mm.

19. The optical imaging lens of claim 16, wherein an effective focal length f3 of the third lens and an effective focal length f4 of the fourth lens satisfy: 0.5< (f4+ f3)/(f4-f3) < 1.0.

20. The optical imaging lens of claim 16, wherein the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: -0.8< f/f1< -0.3.

21. The optical imaging lens of claim 16, wherein an air interval T12 between the first lens and the second lens on the optical axis and a distance BFL2 between an image side surface of the fourth lens to an imaging surface of the optical imaging lens on the optical axis when the optical imaging lens is in a maximum object distance state satisfy: 0< T12/BFL2< 1.0.

22. The optical imaging lens of claim 16, wherein an on-axis distance SAG12 between an intersection point of the image side surface of the first lens and the optical axis to an effective radius vertex of the image side surface of the first lens and an edge thickness ET1 of the first lens satisfies: 0.5< SAG12/ET1< 1.0.

23. The optical imaging lens of claim 16, wherein a maximum effective radius DT11 of the object side surface of the first lens and a maximum effective radius DT41 of the object side surface of the fourth lens satisfy: 0.3< DT41/DT11< 0.8.

24. The optical imaging lens according to claim 16, characterized in that 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: 0.5< ET2/(ET3+ ET4) < 1.0.

25. The optical imaging lens of claim 16, wherein a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R2 of the image-side surface of the first lens satisfy: 0< (R1-R2)/(R1+ R2) < 1.0.

26. The optical imaging lens of claim 16, wherein the radius of curvature of the object-side surface of the second lens, R3, the radius of curvature of the image-side surface of the second lens, R4, and the effective focal length f2 of the second lens satisfy: -0.8< (R3+ R4)/f2< -0.3.

27. The optical imaging lens of claim 16, wherein a radius of curvature R5 of the object-side surface of the third lens, a radius of curvature R6 of the image-side surface of the third 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 0.5< (R7+ R8)/(R5-R6) < 1.0.

28. The optical imaging lens of claim 16, wherein 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 sum Σ CT of the thicknesses of the first to fourth lenses on the optical axis satisfy: 0.5< (CT2+ CT 3)/sigma CT < 1.0.

29. The optical imaging lens of claim 16,