CN113341542B

CN113341542B - Optical imaging lens

Info

Publication number: CN113341542B
Application number: CN202110715865.6A
Authority: CN
Inventors: 李建林; 李洋; 邢天祥; 贺凌波; 黄林; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2022-11-11
Anticipated expiration: 2041-06-24
Also published as: CN113341542A

Abstract

The application discloses an optical imaging lens, which sequentially comprises from an object side to an image side along an optical axis: a first lens having a focal power, an object-side surface of which is convex; a second lens having an optical power; a third lens having a positive optical power; and a fourth lens having a concave object-side surface and having a refractive power. Half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfies: 10 ° < Semi-FOV < 25 °; and the distance TOL of the object to be shot to the object side surface of the first lens on the optical axis satisfies: TOL is more than 2.0mm and less than 32.0mm.

Description

Optical imaging lens

Technical Field

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

Background

With the rapid development of portable electronic products such as smart phones, consumers increasingly apply the shooting function of the smart phones, and the requirements on the imaging quality of the camera lenses under different conditions are higher and higher. However, in most of the existing smart phones in the market, the camera lens is difficult to clearly image tiny details, and the detailed parts of objects are difficult to embody.

Disclosure of Invention

An aspect of the present application provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens having a focal power, an object-side surface of which is convex; a second lens having an optical power; a third lens having a positive optical power; and a fourth lens having a concave object-side surface and having a refractive power. Half of the Semi-FOV of the maximum field angle of the optical imaging lens may satisfy: 10 ° < Semi-FOV < 25 °; and the distance TOL on the optical axis from the shot object to the object side surface of the first lens can satisfy the following conditions: TOL is more than 2.0mm and less than 32.0mm.

In one embodiment, at least one mirror surface of the object side surface of the first lens to the image side surface of the fourth lens is an aspherical mirror surface.

In one embodiment, the combined focal length f12 of the first and second lenses and the combined focal length f23 of the second and third lenses may satisfy: 0 < | f12/f23| < 0.8.

In one embodiment, the central thickness CT2 of the second lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis may satisfy: CT2/CT4 is more than 0 and less than 1.2.

In one embodiment, the combined focal length f12 of the first lens and the second lens and the total effective focal length f of the optical imaging lens may satisfy: f12/f is more than 0.5 and less than 1.5.

In one embodiment, a sum Σ AT of a separation distance T23 on the optical axis of the second lens and the third lens and a separation distance on the optical axis of any adjacent two lenses among the first lens to the fourth lens may satisfy: T23/SIGMA AT ≧ 0.79.

In one embodiment, a distance SAG21 on the optical axis from the intersection point of the object-side surface of the second lens and the optical axis to the effective radius vertex of the object-side surface of the second lens and a distance SAG31 on the optical axis from the intersection point of the object-side surface of the third lens and the optical axis to the effective radius vertex of the object-side surface of the third lens may satisfy: 0 < SAG21/SAG31 < 0.6.

In one embodiment, the effective focal length f3 of the third lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens may satisfy: 0 < f3/| R5+ R6| < 2.

In one embodiment, the edge thickness ET2 of the second lens and the central thickness CT2 of the second lens on the optical axis may satisfy: ET2/CT2 is more than 1 and less than 2.

In one embodiment, the edge thickness ET1 of the first lens, the edge thickness ET4 of the fourth lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT4 of the fourth lens on the optical axis may satisfy: ET1/CT1+ ET4/CT4 is more than 0.5 and less than 2.0.

In one embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT31 of the object-side surface of the third lens may satisfy: 0.5 < DT31/DT11 < 1.

In one embodiment, the maximum effective radius DT12 of the image side surface of the first lens and the separation distance T23 on the optical axis between the second lens and the third lens can satisfy: DT12/T23 is more than 0.2 and less than or equal to 1.

In one embodiment, a separation distance T12 of the first lens and the second lens on the optical axis, a separation distance T23 of the second lens and the third lens on the optical axis, and a separation distance T34 of the third lens and the fourth lens on the optical axis may satisfy: T23/(T12 + T34) > 3.

In one embodiment, the effective focal length f1 of the first lens, the radius of curvature R1 of the object-side surface of the first lens, and the radius of curvature R2 of the image-side surface of the first lens may satisfy: i (R1 + R2)/f 1I is less than 2.

In one embodiment, the magnification M of the optical imaging lens may satisfy: m is more than 0 and less than 0.5.

In one embodiment, the relative F-number Fno of the optical imaging lens and half of the Semi-FOV of the maximum field angle of the optical imaging lens may satisfy: 6.5 < Fno/Tan (Semi-FOV) < 7.5.

In one embodiment, the distance TTL between the object side surface of the first lens element and the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens may satisfy: TTL/f is less than or equal to 1.33.

Another aspect of the present disclosure provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens having a focal power, an object-side surface of which is convex; a second lens having an optical power; a third lens having a positive optical power; and a fourth lens having a concave object-side surface and having a refractive power. Half of the Semi-FOV of the maximum field angle of the optical imaging lens may satisfy: 10 ° < Semi-FOV < 25 °; and a combined focal length f12 of the first lens and the second lens and a combined focal length f23 of the second lens and the third lens may satisfy: 0 < | f12/f23| < 0.8.

In one embodiment, a sum Σ AT of a separation distance T23 of the second lens and the third lens on the optical axis and a separation distance on the optical axis of any adjacent two lenses of the first lens to the fourth lens may satisfy: T23/SIGMA AT ≧ 0.79.

In one embodiment, the maximum effective radius DT12 of the image-side surface of the first lens and the distance T23 between the second lens and the third lens on the optical axis satisfy: DT12/T23 is more than 0.2 and less than or equal to 1.

The optical imaging lens is applicable to portable electronic products and has at least one of magnified detail, miniaturization and good imaging quality.

Drawings

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

fig. 1 shows a schematic structural view of an optical imaging lens according to embodiment 1 of the present application;

fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 1;

fig. 3 is a schematic structural view showing an optical imaging lens according to embodiment 2 of the present application;

fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 2;

fig. 5 is a schematic structural view showing an optical imaging lens according to embodiment 3 of the present application;

fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 3;

fig. 7 is a schematic structural view showing an optical imaging lens according to embodiment 4 of the present application;

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

fig. 9 is a schematic structural view showing an optical imaging lens according to embodiment 5 of the present application;

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

fig. 11 is a schematic structural view showing an optical imaging lens according to embodiment 6 of the present application;

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

fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application; and

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

Detailed Description

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

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

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

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

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

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

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

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

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

In an exemplary embodiment, the first lens may have a positive or negative optical power, and the object-side surface thereof may be convex; the second lens may have a positive or negative optical power; the third lens may have a positive optical power; and the fourth lens can have positive power or negative power, and the object side surface of the fourth lens can be a concave surface.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 10 ° < Semi-FOV < 25 °, where Semi-FOV is half of the maximum field angle of the optical imaging lens. More specifically, the Semi-FOV further satisfies: 17 < Semi-FOV < 23. Satisfying 10 DEG < Semi-FOV < 25 DEG is advantageous for presenting object information on the effective image plane as much as possible.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: T23/(T12 + T34) > 3, where T12 is the distance between the first lens and the second lens on the optical axis, T23 is the distance between the second lens and the third lens on the optical axis, and T34 is the distance between the third lens and the fourth lens on the optical axis. More specifically, T23, T12, and T34 may further satisfy: T23/(T12 + T34) > 3.5. The optical imaging lens meets the requirement that T23/(T12 + T34) > 3, can effectively reduce the gap sensitivity of the lens, can correct field curvature, and can control the total length of the optical imaging lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: l (R1 + R2)/f 1 l < 2, where f1 is an effective focal length of the first lens, R1 is a radius of curvature of an object-side surface of the first lens, and R2 is a radius of curvature of an image-side surface of the first lens. More specifically, R1, R2 and f1 may further satisfy: i (R1 + R2)/f 1I is less than 1.2. Satisfying (R1 + R2)/f 1 < 2, not only can effectively control the shape of the first lens and improve the machinability of the first lens, but also can eliminate the spherical aberration and off-axis aberration of the optical imaging lens and improve the imaging quality of the optical imaging lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < | f12/f23| < 0.8, where f12 is the combined focal length of the first and second lenses and f23 is the combined focal length of the second and third lenses. More specifically, f12 and f23 further satisfy: 0 < | f12/f23| < 0.6. The requirement that f12/f23 is less than 0.8 is met, the off-axis aberration generated by each lens is favorably corrected, and the imaging quality of the lens is improved.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < CT2/CT4 < 1.2, where CT2 is the central thickness of the second lens on the optical axis and CT4 is the central thickness of the fourth lens on the optical axis. More specifically, CT2 and CT4 further satisfy: CT2/CT4 is more than 0.3 and less than 1.0. The requirement that CT2/CT4 is more than 0 and less than 1.2 is met, the thickness sensitivity of the lens can be reduced, and the curvature of field of the lens can be corrected.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: and f12/f is more than 0.5 and less than 1.5, wherein f12 is the combined focal length of the first lens and the second lens, and f is the total effective focal length of the optical imaging lens. More specifically, f12 and f further satisfy: f12/f is more than 0.7 and less than 1.1. F12/f is more than 0.5 and less than 1.5, which is not only beneficial to realizing large view field of object space, but also beneficial to correcting off-axis aberration generated by each lens and improving the imaging quality of the optical imaging lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: t23/sigma AT is more than or equal to 0.79, wherein T23 is the spacing distance between the second lens and the third lens on the optical axis, and sigma AT is the sum of the spacing distances between any two adjacent lenses in the first lens to the fourth lens on the optical axis. The lens meets the requirement that T23/sigma AT is more than or equal to 0.79, can effectively reduce the clearance sensitivity of the lens and correct the field curvature of the lens, and can ensure that the distance between adjacent lenses is larger, thereby being convenient for processing.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < SAG21/SAG31 < 0.6, wherein SAG21 is a distance on the optical axis from an intersection of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens, and SAG31 is a distance on the optical axis from an intersection of the object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens. The requirements that SAG21/SAG31 is more than 0 and less than 0.6 are met, and the surface types of the surfaces of the second lens and the third lens can be effectively controlled, so that the processing of the second lens and the third lens is facilitated, and the reduction of the imaging performance of the lens caused by the total reflection of light rays at the surfaces of the second lens and the third lens is avoided.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < f3/| R5+ R6| < 2, where f3 is the effective focal length of the third lens, R5 is the radius of curvature of the object-side surface of the third lens, and R6 is the radius of curvature of the image-side surface of the third lens. More specifically, f3, R5 and R6 may further satisfy: f3/| R5+ R6| < 0.3 < 1.5. The curvature of the object side surface and the curvature of the image side surface of the third lens can be reasonably controlled to ensure that the field curvature contribution of the third lens is in a reasonable range, and the optical sensitivity of each surface of the third lens is reduced.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1 < ET2/CT2 < 2, wherein ET2 is the edge thickness of the second lens and CT2 is the central thickness of the second lens on the optical axis. More specifically, ET2 and CT2 further satisfy: ET2/CT2 is more than 1.2 and less than 1.8. The requirement that ET2/CT2 is more than 1 and less than 2 is met, the production yield of the second lens can be effectively improved, and the processing of the second lens is facilitated.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.5 < ET1/CT1+ ET4/CT4 < 2.0, wherein ET1 is the edge thickness of the first lens, ET4 is the edge thickness of the fourth lens, CT1 is the central thickness of the first lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis. More specifically, ET1, CT1, ET4, and CT4 further may satisfy: ET1/CT1+ ET4/CT4 is more than 0.8 and less than 1.7. The requirements that ET1/CT1+ ET4/CT4 is more than 0.5 and less than 2.0 are met, the thickness sensitivity of the lens at the first lens and the fourth lens is favorably reduced, the performance of correcting the field curvature of the lens is improved, and the injection molding of each lens is favorably realized.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.5 < DT31/DT11 < 1, where DT11 is the maximum effective radius of the object-side surface of the first lens and DT31 is the maximum effective radius of the object-side surface of the third lens. The requirement that DT31/DT11 is more than 0.5 and less than 1 is met, the convergence of light rays at the edge of the field of view in the optical imaging lens is controlled, and the imaging quality of the field of view in the optical imaging lens is improved.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.2 < DT12/T23 ≦ 1, wherein DT12 is the maximum effective radius of the image side surface of the first lens, and T23 is the distance between the second lens and the third lens on the optical axis. More specifically, DT12 and T23 further satisfy: DT12/T23 is more than 0.5 and less than or equal to 1. The requirement that DT12/T23 is more than 0.2 and less than or equal to 1 is met, the object space view field can be effectively controlled, marginal light rays can be well converged, the illumination of the outer view field is improved, and the distortion of a lens can be corrected.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: and M is more than 0 and less than 0.5, wherein M is the magnification of the optical imaging lens. More specifically, M further may satisfy: m is more than 0.1 and less than 0.4. M is more than 0 and less than 0.5, and the object distance of the optical imaging lens can be effectively controlled, so that the micro-distance effect of the lens can be realized.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 6.5 < Fno/Tan (Semi-FOV) < 7.5, wherein Fno is the relative F number of the optical imaging lens, and Semi-FOV is half of the maximum field angle of the optical imaging lens. More specifically, the Fno and Semi-FOV further satisfy: 6.5 < Fno/Tan (Semi-FOV) < 7.2. The requirements that Fno/Tan (Semi-FOV) is more than 6.5 and less than 7.5 are met, the brightness of the optical imaging lens can be effectively controlled, the illumination of the optical imaging lens is improved, and the size of a chip can be reasonably configured.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 2.0mm < TOL < 32.0mm, wherein TOL is the distance on the optical axis from the object to the object-side surface of the first lens. More specifically, the TOL may further satisfy: TOL is more than 15.0mm and less than 32.0mm. The requirement that the lens has the magnification ratio is favorably realized when TOL is more than 2.0mm and less than 32.0mm, and the imaging performance of the macro lens is favorably improved by reasonably controlling the object distance in consideration of the fact that the macro lens is sensitive to the object distance.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: TTL/f is less than or equal to 1.33, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis, and f is the total effective focal length of the optical imaging lens. The TTL/f is less than or equal to 1.33, and the optical imaging lens has the characteristics of reasonable focal length, total lens length and the like, so that the characteristics of protruding the long focal length of the lens are facilitated, and the characteristics of protruding the small depth of field and high magnification of the lens, miniaturization of the imaging lens and the like are facilitated.

In an exemplary embodiment, the optical imaging lens according to the present application further includes a stop disposed between the second lens and the third lens. 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 application provides an optical imaging lens with characteristics of miniaturization, detail amplification, high imaging quality and the like. Optionally, the optical imaging lens provided by the application can be a macro lens, that is, the optical imaging lens can amplify details of an object shot in a close range to obtain a clear detailed amplified image, so that the requirements of a user on object imaging under different conditions can be met. The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above four lenses. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the axial distance between each lens and the like, the incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the optical imaging lens is more favorable for production and processing.

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

However, it will be appreciated by those skilled in the art that the number of lenses constituting an 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 include four lenses. The optical imaging lens may also include other numbers of lenses, if desired.

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

Example 1

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

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

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

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

TABLE 1

In the present example, the total effective focal length F of the optical imaging lens is 4.36mm, the total length TTL of the optical imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens) is 5.68mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens is 2.19mm, the half Semi-FOV of the maximum angle of view of the optical imaging lens is 19.71 °, and the relative F-number Fno of the optical imaging lens is 2.40.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 to the fourth lens E4 are aspheric, and the surface shape x 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 =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 aspheric surface. Tables 2-1 and 2-2 below show examples that can be used for the experimentsThe high-order coefficient A of each of the aspherical mirror surfaces S1 to S8 in example 1 ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ 、A ₂₀ 、A ₂₂ 、A ₂₄ 、A ₂₆ 、A ₂₈ And A ₃₀ 。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-7.1116E-02

-1.9439E-02

-1.0163E-02

-5.9397E-03

-3.3465E-03

-1.6729E-03

-7.1916E-04

S2

3.6899E-02

-1.3952E-02

-1.5719E-03

-1.7655E-03

6.5335E-05

1.4252E-04

2.5297E-04

S3

1.0588E-01

-1.5795E-02

3.0485E-03

-1.1169E-03

1.3587E-04

-1.2641E-04

2.8346E-05

S4

3.5887E-02

-3.8267E-03

6.2806E-04

-1.2187E-04

2.6686E-05

-9.0454E-06

3.8914E-06

S5

2.0312E-01

-1.7328E-02

-7.9551E-03

1.1464E-02

-1.1562E-02

8.3824E-03

-5.5030E-03

S6

-2.1462E-01

9.9154E-02

-7.0241E-02

3.2797E-02

-2.9352E-02

7.4159E-03

-4.1457E-03

S7

-1.8295E-01

-2.3754E-02

3.8904E-02

-1.1672E-02

1.1198E-02

-9.2264E-04

-1.3774E-04

S8

-3.5261E-01

-3.5442E-02

3.3931E-02

-1.1984E-02

1.1687E-02

-2.1570E-03

1.8932E-03

TABLE 2-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.3695E-04

-5.5025E-05

0.0000E+00

S2

1.0063E-04

4.7869E-05

0.0000E+00

S3

-1.5245E-06

1.4759E-05

0.0000E+00

S4

-1.0835E-07

-2.9204E-07

0.0000E+00

S5

3.3735E-03

-1.6923E-03

6.9881E-04

-1.9638E-04

5.6740E-05

0.0000E+00

S6

2.3215E-03

-1.3839E-03

5.6078E-04

4.7718E-05

-1.4495E-04

6.4753E-05

-5.2380E-05

S7

-4.9429E-04

-5.7628E-05

0.0000E+00

S8

-3.2099E-04

3.0214E-04

0.0000E+00

Tables 2 to 2

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

Example 2

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

As shown in fig. 3, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image forming surface S11.

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

In this example, the total effective focal length F of the optical imaging lens is 4.52mm, the total length TTL of the optical imaging lens is 5.70mm, a half ImgH of a diagonal length of an effective pixel area on the imaging surface S11 of the optical imaging lens is 2.19mm, a half Semi-FOV of a maximum field angle of the optical imaging lens is 19.35 °, and the relative F-number Fno of the optical imaging lens is 2.49.

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

TABLE 3

TABLE 4

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

Example 3

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

As shown in fig. 5, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image forming surface S11.

In this example, the total effective focal length F of the optical imaging lens is 4.37mm, the total length TTL of the optical imaging lens is 5.68mm, a half ImgH of a diagonal length of an effective pixel area on the imaging surface S11 of the optical imaging lens is 2.19mm, a half Semi-FOV of a maximum field angle of the optical imaging lens is 19.63 °, and the relative F-number Fno of the optical imaging lens is 2.40.

Table 5 shows a basic parameter table of the optical imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 6-1, 6-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-7.1116E-02

-1.9439E-02

-1.0163E-02

-5.9397E-03

-3.3465E-03

-1.6729E-03

-7.1916E-04

S2

3.6899E-02

-1.3952E-02

-1.5719E-03

-1.7655E-03

6.5335E-05

1.4252E-04

2.5297E-04

S3

1.0588E-01

-1.5795E-02

3.0485E-03

-1.1169E-03

1.3587E-04

-1.2641E-04

2.8346E-05

S4

3.5887E-02

-3.8267E-03

6.2806E-04

-1.2187E-04

2.6686E-05

-9.0454E-06

3.8914E-06

S5

2.0312E-01

-1.7328E-02

-7.9551E-03

1.1464E-02

-1.1562E-02

8.3824E-03

-5.5030E-03

S6

-2.1462E-01

9.9154E-02

-7.0241E-02

3.2797E-02

-2.9352E-02

7.4159E-03

-4.1457E-03

S7

-1.8295E-01

-2.3754E-02

3.8904E-02

-1.1672E-02

1.1198E-02

-9.2264E-04

-1.3774E-04

S8

-3.5261E-01

-3.5442E-02

3.3931E-02

-1.1984E-02

1.1687E-02

-2.1570E-03

1.8932E-03

TABLE 6-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.3695E-04

-5.5025E-05

0.0000E+00

S2

1.0063E-04

4.7869E-05

0.0000E+00

S3

-1.5245E-06

1.4759E-05

0.0000E+00

S4

-1.0835E-07

-2.9204E-07

0.0000E+00

S5

3.3735E-03

-1.6923E-03

6.9881E-04

-1.9638E-04

5.6740E-05

0.0000E+00

S6

2.3215E-03

-1.3839E-03

5.6078E-04

4.7718E-05

-1.4495E-04

6.4753E-05

-5.2380E-05

S7

-4.9429E-04

-5.7628E-05

0.0000E+00

S8

-3.2099E-04

3.0214E-04

0.0000E+00

TABLE 6-2

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

Example 4

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

As shown in fig. 7, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image forming surface S11.

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

In this example, the total effective focal length F of the optical imaging lens is 4.26mm, the total length TTL of the optical imaging lens is 5.45mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens is 2.19mm, the half Semi-FOV of the maximum field angle of the optical imaging lens is 19.44 °, and the relative F-number Fno of the optical imaging lens is 2.47.

Table 7 shows a basic parameter table of the optical imaging lens of embodiment 4, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 8-1, 8-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.1209E-01

-3.0498E-02

-9.7798E-03

-2.8012E-03

-8.9120E-04

-2.5450E-04

-1.1869E-04

S2

6.2139E-02

-1.9994E-02

4.1388E-03

-2.5354E-03

1.3491E-04

-4.6930E-04

-4.2285E-06

S3

1.3581E-01

-1.9949E-02

7.2302E-03

-2.0381E-03

5.9825E-04

-2.0816E-04

7.8475E-05

S4

4.8920E-02

-1.9367E-03

9.7827E-04

-1.3848E-04

3.9647E-05

-5.6088E-06

-4.2142E-06

S5

-1.9894E-01

9.3075E-03

-3.7592E-02

-4.5884E-02

-3.7487E-02

-3.2541E-02

-2.6893E-02

S6

1.2754E-01

4.1981E-02

2.5690E-02

-8.6717E-03

2.8916E-04

4.7054E-04

4.3124E-04

S7

-8.3276E-02

2.7924E-02

3.5256E-02

-2.3961E-02

8.7296E-03

-1.3978E-03

2.5763E-04

S8

-4.9213E-01

-3.6081E-03

2.7911E-02

-1.3310E-02

6.1570E-03

-1.3658E-03

9.7569E-04

TABLE 8-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-3.3983E-05

-2.3478E-05

-1.5103E-06

-4.0814E-06

3.6366E-06

-4.5499E-06

0.0000E+00

S2

-6.8504E-05

-2.6786E-06

0.0000E+00

S3

-4.8527E-06

1.0516E-05

0.0000E+00

S4

-3.1108E-06

1.8238E-06

0.0000E+00

S5

-2.0086E-02

-1.4084E-02

-8.8908E-03

-5.2700E-03

-3.0983E-03

-1.8381E-03

-8.0452E-04

S6

-2.9594E-05

-3.9939E-05

7.9552E-05

7.7849E-05

1.9574E-05

6.3780E-06

-8.8897E-06

S7

-2.0534E-04

4.7398E-05

0.0000E+00

S8

-1.2286E-04

1.3582E-04

0.0000E+00

TABLE 8-2

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

Example 5

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

As shown in fig. 9, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image forming surface S11.

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

In this example, the total effective focal length F of the optical imaging lens is 4.23mm, the total length TTL of the optical imaging lens is 5.36mm, a half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens is 2.19mm, a half Semi-FOV of the maximum field angle of the optical imaging lens is 19.52 °, and the relative F-number Fno of the optical imaging lens is 2.52.

Table 9 shows a basic parameter table of the optical imaging lens of embodiment 5, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 10-1, 10-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.8747E-01

-6.2236E-02

-2.5393E-02

-1.1465E-02

-5.7095E-03

-3.0389E-03

-1.7146E-03

S2

7.4042E-02

-1.9428E-02

6.6676E-04

-1.4569E-03

-2.1563E-04

-1.2537E-04

-4.1986E-05

S3

1.5220E-01

-1.5899E-02

4.7206E-03

-1.0535E-03

3.4921E-04

-6.4488E-05

5.5840E-05

S4

6.6420E-02

-2.1264E-03

1.1712E-03

-1.1664E-04

3.4813E-05

-1.0709E-05

1.6155E-06

S5

-1.7939E-01

2.4686E-03

-3.3784E-02

-5.0146E-02

-3.7567E-02

-2.7189E-02

-2.3040E-02

S6

1.3414E-01

-2.4994E-02

4.8017E-02

-8.7825E-03

5.3304E-03

-2.5585E-03

6.1053E-05

S7

-1.5049E-01

1.1473E-02

4.0209E-02

-2.1917E-02

9.1851E-03

-2.4624E-03

3.1524E-04

S8

-5.7443E-01

1.3170E-02

1.4763E-02

-9.1147E-03

3.9615E-03

-3.8397E-04

1.7272E-04

TABLE 10-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-9.9102E-04

-6.0445E-04

-3.8020E-04

-2.5960E-04

-1.9937E-04

-1.2683E-04

0.0000E+00

S2

-1.2070E-05

-1.2103E-05

0.0000E+00

S3

8.5741E-06

9.0822E-06

0.0000E+00

S4

2.5768E-06

3.4284E-06

0.0000E+00

S5

-1.8141E-02

-1.1502E-02

-5.9020E-03

-2.9066E-03

-1.5813E-03

-8.8299E-04

-3.6357E-04

S6

-3.1357E-04

1.8168E-04

1.3059E-04

1.5040E-04

3.3287E-05

3.6381E-05

-8.3444E-06

S7

-9.9152E-05

3.4055E-05

0.0000E+00

S8

5.6856E-05

-1.0206E-05

0.0000E+00

TABLE 10-2

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

Example 6

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

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

In this example, the total effective focal length F of the optical imaging lens is 4.10mm, the total length TTL of the optical imaging lens is 5.30mm, a half ImgH of a diagonal length of an effective pixel area on the imaging surface S11 of the optical imaging lens is 2.19mm, a half Semi-FOV of a maximum field angle of the optical imaging lens is 19.49 °, and the relative F-number Fno of the optical imaging lens is 2.52.

Table 11 shows a basic parameter table of the optical imaging lens of embodiment 6, in which the units of the radius of curvature, thickness/distance, and focal length are millimeters (mm). Tables 12-1, 12-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 11

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

9.0494E-02

-3.9626E-03

-3.5509E-03

-1.1624E-03

-4.0175E-04

-1.3263E-04

-7.6799E-05

S2

6.9513E-02

-2.1712E-02

8.4859E-04

-1.6648E-03

-1.5300E-04

-1.2691E-04

-1.3995E-05

S3

1.6482E-01

-1.3409E-02

4.5752E-03

-7.8320E-04

2.5050E-04

-9.4583E-06

3.7919E-05

S4

7.9059E-02

-3.7681E-03

1.4612E-03

-1.7067E-04

5.8610E-05

-1.5949E-05

7.9073E-07

S5

-1.4580E-01

9.3957E-05

-3.2598E-02

-4.8919E-02

-3.8493E-02

-2.8913E-02

-2.4999E-02

S6

9.6609E-02

-1.8492E-02

5.4279E-02

-3.9956E-03

3.2664E-03

-4.7668E-03

7.2981E-05

S7

-1.7946E-01

5.5102E-03

4.1202E-02

-1.3158E-02

6.4926E-03

-4.4321E-03

1.3942E-03

S8

-5.6622E-01

4.8683E-03

1.0015E-02

-2.7413E-03

3.9263E-03

-9.7983E-04

3.6751E-04

TABLE 12-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.8028E-05

-1.2367E-05

1.3194E-06

-1.7871E-06

2.3073E-06

-1.4614E-06

0.0000E+00

S2

-1.0612E-05

-5.3188E-06

0.0000E+00

S3

1.9439E-05

4.7745E-06

0.0000E+00

S4

-3.6126E-06

3.0387E-06

0.0000E+00

S5

-2.0220E-02

-1.3250E-02

-7.0776E-03

-3.5957E-03

-1.9888E-03

-1.1714E-03

-4.9784E-04

S6

1.7744E-04

7.4272E-04

4.3756E-04

2.1688E-04

-1.1406E-05

-4.1161E-05

-4.7742E-05

S7

-2.5003E-04

5.2437E-05

0.0000E+00

S8

-2.7359E-05

-1.6146E-05

0.0000E+00

TABLE 12-2

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

Example 7

An optical imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image forming surface S11.

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

In this example, the total effective focal length F of the optical imaging lens is 3.97mm, the total length TTL of the optical imaging lens is 5.30mm, a half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens is 2.19mm, a half Semi-FOV of the maximum field angle of the optical imaging lens is 19.34 °, and the relative F-number Fno of the optical imaging lens is 2.44.

Table 13 shows a basic parameter table of the optical imaging lens of embodiment 7, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 14-1, 14-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

Watch 13

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.2608E-01

-8.7650E-02

-4.1511E-02

-2.2433E-02

-1.3477E-02

-8.7318E-03

-5.9397E-03

S2

6.0880E-02

-2.4106E-02

-1.1971E-03

-1.8647E-03

-2.9986E-04

-1.7673E-04

-1.9043E-05

S3

1.6715E-01

-1.0217E-02

3.3473E-03

-1.4391E-04

-3.4138E-05

5.6058E-05

-5.7883E-05

S4

1.3394E-01

-5.7070E-03

2.4751E-03

-1.9034E-04

1.0359E-04

-4.1181E-06

7.7714E-06

S5

-6.3983E-02

-9.5624E-04

4.5205E-03

1.6337E-03

6.0321E-05

-2.3642E-04

-1.1701E-04

S6

1.8033E-01

-3.7055E-02

5.3110E-02

-4.0578E-03

3.6456E-03

-5.0169E-03

-2.8026E-04

S7

-1.8067E-01

-5.2848E-03

4.1079E-02

-9.7277E-03

6.3155E-03

-5.0465E-03

8.7003E-04

S8

-5.7235E-01

8.0139E-03

7.3309E-03

-2.1866E-03

4.4835E-03

-1.4019E-03

1.2847E-04

TABLE 14-1

TABLE 14-2

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

In conclusion, examples 1 to 7 each satisfy the relationship shown in table 15.

Conditions/examples	1	2	3	4	5	6	7
								T23/(T12+T34)	3.80	5.45	3.89	3.95	6.22	6.25	5.69
T23/∑AT	0.79	0.84	0.80	0.80	0.86	0.86	0.85
								\|(R1+R2)/f1\|	0.58	0.99	0.61	0.38	0.58	0.54	0.76
M	0.20	0.20	0.20	0.23	0.24	0.27	0.30
								\|f12/f23\|	0.31	0.44	0.31	0.30	0.18	0.15	0.22
f12/f	0.96	0.94	0.96	0.84	0.81	0.81	0.82
								CT2/CT4	0.46	0.52	0.43	0.61	0.86	0.68	0.63
Fno/Tan(Semi-FOV)	6.70	7.09	6.73	7.00	7.11	7.13	6.94
								ET2/CT2	1.62	1.53	1.63	1.56	1.32	1.41	1.55
ET1/CT1+ET4/CT4	1.53	1.57	1.52	0.99	0.99	0.97	1.04
								DT31/DT11	0.81	0.85	0.81	0.66	0.68	0.69	0.74
SAG21/SAG31	0.51	0.35	0.50	0.32	0.26	0.27	0.24
								f3/\|R5+R6\|	0.43	0.42	0.42	1.34	1.19	1.38	1.21
DT12/T23	0.77	0.69	0.77	0.94	1.00	0.99	0.90
								TTL/f	1.30	1.26	1.30	1.28	1.27	1.29	1.33

Watch 15

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.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

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

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

a second lens having a negative optical power;

a third lens having a positive optical power; and

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

half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfies: 10 ° < Semi-FOV < 25 °;

the distance TOL on the optical axis from the object to the object side surface of the first lens satisfies: TOL is more than 2.0mm and less than 32.0mm;

a separation distance T23 of the second lens and the third lens on the optical axis and a sum Σ AT of separation distances on the optical axis of any adjacent two lenses of the first lens to the fourth lens satisfy: T23/Sigma AT is more than or equal to 0.79;

the optical imaging lens has four lenses with focal power.

2. The optical imaging lens according to claim 1, wherein a combined focal length f12 of the first lens and the second lens and a combined focal length f23 of the second lens and the third lens satisfy: 0 < | f12/f23| < 0.8.

3. The optical imaging lens according to claim 1, wherein a center thickness CT2 of the second lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: CT2/CT4 is more than 0 and less than 1.2.

4. The optical imaging lens of claim 1, wherein a combined focal length f12 of the first lens and the second lens and a total effective focal length f of the optical imaging lens satisfy: f12/f is more than 0.5 and less than 1.5.

5. The optical imaging lens according to claim 1, wherein a distance SAG21 on the optical axis from an intersection point of an object side surface of the second lens and the optical axis to an effective radius vertex of an object side surface of the second lens to a distance SAG31 on the optical axis from an intersection point of an object side surface of the third lens and the optical axis to an effective radius vertex of an object side surface of the third lens satisfies: 0 < SAG21/SAG31 < 0.6.

6. The optical imaging lens according to claim 1, wherein an effective focal length f3 of the third lens, a radius of curvature R5 of an object side surface of the third lens, and a radius of curvature R6 of an image side surface of the third lens satisfy: 0 < f3/| R5+ R6| < 2.

7. The optical imaging lens according to claim 1, wherein the edge thickness ET2 of the second lens and the center thickness CT2 of the second lens on the optical axis satisfy: ET2/CT2 is more than 1 and less than 2.

8. The optical imaging lens according to claim 1, wherein the edge thickness ET1 of the first lens, the edge thickness ET4 of the fourth lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy: ET1/CT1+ ET4/CT4 is more than 0.5 and less than 2.0.

9. The optical imaging lens of claim 1, wherein the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT31 of the object-side surface of the third lens satisfy: 0.5 < DT31/DT11 < 1.

10. The optical imaging lens according to claim 1, wherein a maximum effective radius DT12 of an image side surface of the first lens and a separation distance T23 on the optical axis between the second lens and the third lens satisfy: DT12/T23 is more than 0.2 and less than or equal to 1.

11. The optical imaging lens according to claim 1, wherein a separation distance T12 on the optical axis between the first lens and the second lens, a separation distance T23 on the optical axis between the second lens and the third lens, and a separation distance T34 on the optical axis between the third lens and the fourth lens satisfy: T23/(T12 + T34) > 3.

12. The optical imaging lens according to claim 1, wherein the effective focal length f1 of the first lens, the radius of curvature R1 of the object side surface of the first lens, and the radius of curvature R2 of the image side surface of the first lens satisfy: l (R1 + R2)/f 1 l is less than 2.

13. An optical imaging lens according to any one of claims 1 to 12, wherein the magnification M of the optical imaging lens satisfies: m is more than 0 and less than 0.5.

14. The optical imaging lens according to any one of claims 1 to 12, wherein the relative F-number Fno of the optical imaging lens and half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfy: 6.5 < Fno/Tan (Semi-FOV) < 7.5.

15. The optical imaging lens assembly as claimed in any one of claims 1 to 12, wherein a distance TTL between an object side surface of the first lens and an imaging surface of the optical imaging lens assembly on the optical axis and a total effective focal length f of the optical imaging lens assembly satisfy: TTL/f is less than or equal to 1.33.

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

a second lens having a negative optical power;

a third lens having a positive optical power; and

a combined focal length f12 of the first lens and the second lens and a combined focal length f23 of the second lens and the third lens satisfy: 0 < | f12/f23| < 0.8;

the optical imaging lens has four lenses with focal power.

17. The optical imaging lens according to claim 16, wherein a center thickness CT2 of the second lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: CT2/CT4 is more than 0 and less than 1.2.

18. The optical imaging lens of claim 16, wherein a combined focal length f12 of the first lens and the second lens and a total effective focal length f of the optical imaging lens satisfy: f12/f is more than 0.5 and less than 1.5.

19. The optical imaging lens according to claim 16, wherein a distance SAG21 on the optical axis from an intersection point of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens to a distance SAG31 on the optical axis from an intersection point of the object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens satisfies: 0 < SAG21/SAG31 < 0.6.

20. The optical imaging lens of claim 16, wherein the effective focal length f3 of the third lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens satisfy: 0 < f3/| R5+ R6| < 2.

21. The optical imaging lens according to claim 16, wherein the edge thickness ET2 of the second lens and the center thickness CT2 of the second lens on the optical axis satisfy: ET2/CT2 is more than 1 and less than 2.

22. The optical imaging lens according to claim 16, wherein the edge thickness ET1 of the first lens, the edge thickness ET4 of the fourth lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy: ET1/CT1+ ET4/CT4 is more than 0.5 and less than 2.0.

23. The optical imaging lens of claim 16, wherein the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT31 of the object side surface of the third lens satisfy: 0.5 < DT31/DT11 < 1.

24. The optical imaging lens according to claim 16, wherein a maximum effective radius DT12 of an image side surface of the first lens and a separation distance T23 on the optical axis between the second lens and the third lens satisfy: DT12/T23 is more than 0.2 and less than or equal to 1.

25. The optical imaging lens according to claim 16, wherein a separation distance T12 on the optical axis between the first lens and the second lens, a separation distance T23 on the optical axis between the second lens and the third lens, and a separation distance T34 on the optical axis between the third lens and the fourth lens satisfy: T23/(T12 + T34) > 3.

26. The optical imaging lens of claim 16, wherein the effective focal length f1 of the first lens, the radius of curvature R1 of the object-side surface of the first lens, and the radius of curvature R2 of the image-side surface of the first lens satisfy: l (R1 + R2)/f 1 l is less than 2.

27. An optical imaging lens according to any one of claims 16 to 26, characterized in that the magnification M of the optical imaging lens satisfies: m is more than 0 and less than 0.5.

28. The optical imaging lens of any one of claims 16 to 26, wherein the relative F-number Fno of the optical imaging lens and half of the Semi-FOV of the maximum field angle of the optical imaging lens satisfy: 6.5 < Fno/Tan (Semi-FOV) < 7.5.

29. The optical imaging lens of any one of claims 16 to 26, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens on the optical axis and a total effective focal length f of the optical imaging lens satisfy: TTL/f is less than or equal to 1.33.