CN114967055B

CN114967055B - Optical imaging lens

Info

Publication number: CN114967055B
Application number: CN202210469823.3A
Authority: CN
Inventors: 张韵; 姚嘉诚; 唐梦娜; 吕赛锋; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2024-05-28
Anticipated expiration: 2042-04-28
Also published as: CN114967055A

Abstract

The application provides an optical imaging lens, which sequentially comprises from an object side to an image side along an optical axis: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the second lens element with negative refractive power has a concave object-side surface; the third lens element with positive refractive power has a concave object-side surface and a convex image-side surface; the fourth lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the conditional expression is satisfied: 1.5 < Σct/T23-CT4/T34 < 15.5, wherein Σct is the sum of the center thicknesses of the first lens to the fourth lens on the optical axis, respectively, T23 is the air interval of the second lens and the third lens on the optical axis, T34 is the air interval of the third lens and the fourth lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis.

Description

Optical imaging lens

Technical Field

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

Background

In recent years, along with the progress of technology, the requirements of people on mobile lenses are also higher and higher, and various wide-angle, ultra-wide-angle, long-focus and zoom lenses are rapidly developed, and the development of infrared lenses is also included. The working wave band of the infrared lens is a long wave band longer than the visible light wave band, and the infrared lens has the characteristics of strong anti-interference capability, strong smoke dust penetrating and haze penetrating capabilities and the like. The front FACE ID lens in the mobile phone field usually uses an infrared lens to realize the FACE recognition function. In addition, infrared lenses are also widely used in the military field. The important application scene of the infrared lens further improves the requirements of users on the performance of the infrared lens, and how to acquire the high resolution, high relative illuminance and small distortion performance of the infrared lens and better balance the relationship among the three is a difficult problem of the development of the infrared lens.

Disclosure of Invention

In some embodiments, the optical imaging lens satisfies: 5.0 < R1/(CT 1-T12) < 10.5, wherein R1 is the radius of curvature of the surface of the first lens facing the object side, CT1 is the center thickness of the first lens on the optical axis, and T12 is the air gap between the first lens and the second lens on the optical axis.

In some embodiments, the optical imaging lens satisfies: 0 < (R2-f 1)/(R7+R8) < 2.5, wherein R2 is the radius of curvature of the surface of the first lens facing the image side, R7 is the radius of curvature of the surface of the fourth lens facing the object side, R8 is the radius of curvature of the surface of the fourth lens facing the image side, and f1 is the effective focal length of the first lens.

In some embodiments, the optical imaging lens satisfies: 18.0 < (f 3-R5)/T23 < 53.5, wherein f3 is an effective focal length of the third lens, R5 is a radius of curvature of a face of the third lens facing an object side, and T23 is an air gap of the second lens and the third lens on the optical axis.

In some embodiments, the optical imaging lens satisfies: 1.0 < (Σct- Σat)/(CT 2+ CT 3) < 1.5, wherein Σat is the sum of air intervals on the optical axis of any adjacent two lenses of the first lens to the fourth lens, CT2 is the center thickness on the optical axis of the second lens, and CT3 is the center thickness on the optical axis of the third lens.

In some embodiments, the optical imaging lens satisfies: -20.0 < R3/TD < -5.0, where R3 is the radius of curvature of the face of the second lens towards the object side and TD is the on-axis distance from the face of the first lens towards the object side to the face of the fourth lens towards the image side.

In some embodiments, the optical imaging lens satisfies: -2.5 < (f Σat)/(R4 χt34) < 2.5, wherein f is the effective focal length of the optical imaging lens, R4 is the radius of curvature of the surface of the second lens facing the image side, T34 is the air separation of the third lens and the fourth lens on the optical axis, and Σat is the sum of the air separation of any adjacent two lenses of the first lens to the fourth lens on the optical axis.

In any of the above embodiments, the optical imaging lens is applied to a near infrared lens of a near infrared band.

The application provides a four-lens framework, which can effectively control the deflection angle of the whole light by reasonably configuring the sum of the refractive power, the surface shape and the center thickness of each lens, the interval between the second lens and the third lens and the interval between the third lens and the fourth lens, is beneficial to balancing the aberration of the whole system, reduces the sensitivity of the field curvature of a marginal field and realizes higher 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 accompanying drawings in which:

Fig. 1 shows a schematic configuration diagram 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 astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 1;

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

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

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

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

fig. 7 shows a schematic configuration diagram of 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 magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 4;

fig. 9 shows a schematic configuration diagram of 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 magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 5;

Fig. 11 shows a schematic structural view of 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 magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 6;

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

Fig. 14 to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens of embodiment 7, respectively.

Detailed Description

For a better understanding of the application, various aspects of the 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 application and is not intended to limit the scope of the 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 the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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, then 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 referred to as the object-side facing surface of the lens, and the surface of each lens closest to the imaging surface is referred to as the image-side facing surface of the lens.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more 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, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

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

The optical imaging lens according to the exemplary embodiment of the present application includes four lenses, which are a first lens, a second lens, a third lens, and a fourth lens, respectively. The four lenses are sequentially arranged from the light incidence side to the light emergence side. Any two adjacent lenses in the first lens to the fourth lens can have a spacing distance.

In an exemplary embodiment, the first lens element may have positive refractive power with a convex surface facing the object-side surface and a concave surface facing the image-side surface; the second lens element with negative refractive power has a concave object-side surface; the third lens element with positive refractive power has a concave surface facing the object-side surface and a convex surface facing the image-side surface; the fourth lens element with negative refractive power has a convex object-side surface and a concave image-side surface. By setting the refractive power of the first lens to be positive and the refractive power of the second lens to be negative, the deflection angle of the whole light can be effectively controlled, the aberration of the whole system can be balanced, and higher imaging quality can be realized. By arranging the concave surface of the third lens towards the object side and the convex surface of the fourth lens towards the object side and the concave surface of the fourth lens towards the image side, spherical aberration generated by the front lens is balanced and curvature of field of the fringe field is controlled.

In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.5 < ΣCT/T23-CT4/T34 < 15.5, ΣCT is the sum of the central thicknesses of the first lens to the fourth lens on the optical axis respectively, T23 is the air interval of the second lens and the third lens on the optical axis, T34 is the air interval of the third lens and the fourth lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis. By controlling the difference between the sum Σct of the center thicknesses of the first lens to the fourth lens on the optical axis and the ratio of the air interval T23 of the second lens and the third lens on the optical axis and the ratio of the center thickness CT4 of the fourth lens on the optical axis and the air interval T34 of the third lens and the fourth lens on the optical axis, respectively, the high sensitivity of the on-axis spacing pair and the fringe field curvature between the second lens and the third lens and between the third lens and the fourth lens can be effectively reduced. More specifically, Σct, T23, CT4, and T34 < 15.5 may further satisfy: sigma CT/T23-CT4/T34 < 10.5.0.

In an exemplary embodiment, the optical imaging lens according to the present application satisfies: R1/(CT 1-T12) < 10.5, R1 is the radius of curvature of the surface of the first lens facing the object side, CT1 is the center thickness of the first lens on the optical axis, and T12 is the air gap between the first lens and the second lens on the optical axis. The distortion amount of each view field of the lens can be effectively controlled by controlling the curvature radius R1 of the surface of the first lens facing the object side, the central thickness CT1 of the first lens on the optical axis and the air interval T12 of the first lens and the second lens on the optical axis within a reasonable range, and finally, the distortion amount of the lens is ensured to be within 3 percent, so that the imaging quality is improved. More specifically, the difference between CT1 and T12 and R1 may further satisfy: R1/(CT 1-T12) < 6.5 < 8.5.

In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 0 < (R2-f 1)/(R7+R8) < 2.5, R2 is the radius of curvature of the surface of the first lens element facing the image side, R7 is the radius of curvature of the surface of the fourth lens element facing the object side, R8 is the radius of curvature of the surface of the fourth lens element facing the image side, and f1 is the effective focal length of the first lens element. By controlling the sum of the difference between the radius of curvature R2 of the first lens element facing the image side and the effective focal length f1 of the first lens element and the radius of curvature R7 of the fourth lens element facing the object side and the radius of curvature R8 of the surface facing the image side to be within a reasonable range, aberrations generated by the first lens element and the fourth lens element can be effectively compensated, and the sensitivity of the first lens element and the fourth lens element can be reduced. More specifically: the sum of the difference between R2 and f1 and R7 and R8 can further satisfy: 0.5 < (R2-f 1)/(R7+R8) < 1.5.

In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 18.0 < (f 3-R5)/T23 < 53.5, f3 being the effective focal length of the third lens, R5 being the radius of curvature of the face of the third lens facing the object side, T23 being the air separation of the second lens and the third lens on the optical axis. The refractive angle of the light beam propagating in the lens in the third lens can be effectively controlled by controlling the ratio of the difference value of the effective focal length f3 of the third lens and the curvature radius R5 of the surface of the third lens facing the object side to the air interval T23 of the second lens and the third lens on the optical axis within a reasonable range, so that good processing characteristics are realized. More specifically, the difference between f3 and R5 and T23 may further satisfy: 30.0 < (f 3-R5)/T23 < 40.5.

In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 1.0 < (ΣCT- ΣAT)/(CT2+CT3) < 1.5, ΣCT being the sum of the thicknesses of the centers of the first lens to the fourth lens on the optical axis, respectively, ΣAT being the sum of the air intervals of any adjacent two lenses of the first lens to the fourth lens on the optical axis, CT2 being the thickness of the center of the second lens on the optical axis, CT3 being the thickness of the center of the third lens on the optical axis. The sum of the center thicknesses of the first lens and the fourth lens on the optical axis ΣCT, the sum of the air intervals of any two adjacent lenses of the first lens and the fourth lens on the optical axis ΣAT, and the sum of the center thicknesses of the second lens and the third lens on the optical axis CT2 and CT3 are controlled within a reasonable range, so that the processing manufacturability of the second lens and the third lens is improved, the molding manufacturing difficulty is reduced, and the sensitivity of the second lens and the third lens is reduced. More specifically, the sum of the difference between Σct and Σat and the sum of CT2 and CT3 further satisfies: 1.2 < (ΣCT- ΣAT)/(CT2+CT3) < 1.4.

In an exemplary embodiment, the optical imaging lens according to the present application satisfies: -20.0 < R3/TD < -5.0, R3 being the radius of curvature of the face of the second lens towards the object side, TD being the on-axis distance from the face of the first lens towards the object side to the face of the fourth lens towards the image side. The curvature radius R3 of the second lens facing the object side and the axial distance TD from the first lens facing the object side to the fourth lens facing the image side are controlled within a reasonable range, so that the deflection angle of the edge view field in the second lens can be controlled, the sensitivity of the system is effectively reduced, the surface shape of the lens is effectively controlled, and the second lens has better processing and molding manufacturability. More specifically, R3 and TD may further satisfy: -15.0 < R3/TD < -10.0.

In an exemplary embodiment, the optical imaging lens according to the present application satisfies: -2.5 < (f Σat)/(R4 ×t34) < 2.5, f is the effective focal length of the optical imaging lens, R4 is the radius of curvature of the surface of the second lens element facing the image side, T34 is the air separation of the third lens element and the fourth lens element on the optical axis, Σat is the sum of the air separation of any two adjacent lens elements of the first lens element to the fourth lens element on the optical axis, and R4 is the radius of curvature of the second lens element facing the image side. The effective focal length f of the optical imaging lens, the product of the total sigma AT of the air interval between any two adjacent lenses on the optical axis in the first lens to the fourth lens, the curvature radius R4 of the surface of the second lens facing the image side and the product of the air interval T34 between the third lens and the fourth lens on the optical axis are controlled within a certain range, the field curvature contribution of each view field can be effectively controlled within a reasonable range, the aberration of the view field of the lens outside the axis is smaller, so that the off-axis view field of the lens can obtain good imaging quality, and the sensitivity and the processing difficulty of the second lens can be reduced. More specifically, the product of f, Σat, and the product of R4, T34 satisfies: 0 < (f × Σat)/(R4 × T34) < 2.0.

In an exemplary embodiment, the optical imaging lens is a near infrared lens, has the working wavelength of 930-950nm in a near infrared band, and has the characteristics of strong anti-interference capability, strong smoke and haze penetrating capability and the like.

In an exemplary embodiment, the effective focal length f of the optical imaging lens may be, for example, in a range of 1.0mm to 2.0mm, the total length TTL of the optical imaging lens (i.e., the distance on the optical axis from the object-side facing surface of the first lens to the imaging surface of the optical imaging lens) may be, for example, in a range of 2.5mm to 3.5mm, and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens may be, for example, in a range of 1.0mm to 2.0mm, and the half of the maximum field angle Semi-FOV of the optical imaging lens may be, for example, in a range of 45.0 ° to 46.0 °.

In an exemplary embodiment, the optical imaging lens according to the present application further includes a diaphragm disposed between the object side and the first 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 located on the imaging surface. The application provides an optical imaging lens with the characteristics of small aberration, high imaging quality, strong anti-change capability and the like. The optical imaging lens according to the above embodiment of the present application may employ a plurality of lenses, for example, four lenses described above. By reasonably configuring the sum of the refractive power, the surface shape and the center thickness of each lens, the interval between the second lens and the third lens and the interval between the third lens and the fourth lens, the deflection angle of the whole light can be effectively controlled, the aberration of the whole system can be balanced, and higher imaging quality can be realized.

In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, that is, at least one of the mirrors of the first lens toward the object side to the fourth lens toward the image side is an aspherical mirror. The aspherical 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 a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of a surface facing the object side and a surface facing the image side of each of the first lens, the second lens, the third lens, and the fourth lens is an aspherical mirror surface. Optionally, a surface of each of the first lens, the second lens, the third lens and the fourth lens facing the object side and a surface facing the image side are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging lens can be varied to achieve the various results and advantages described in this specification without departing from the technical solution claimed in the present application. For example, although four lenses are described as an example in the embodiment, the optical imaging lens is not limited to include four lenses. The optical imaging lens may also include other numbers of lenses, if desired.

Specific examples of the optical imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying 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 configuration diagram of an optical imaging lens according to embodiment 1 of the present application.

As shown in fig. 1, the optical imaging lens of embodiment 1 sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, filter E5 and imaging surface S12.

The first lens element E1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with negative refractive power has a concave surface on an object-side surface S3 and a convex surface on an image-side surface S4. The third lens element E3 with positive refractive power has a concave surface on an object-side surface S5 and a convex surface on an image-side surface S6. The fourth lens element E4 with negative refractive power has a convex object-side surface S7 and a concave image-side surface S8. The filter E5 has a surface S9 facing the object side and a surface S11 facing the image side. Light from the object sequentially passes through the respective surfaces S1 to S11 and is finally imaged on the imaging surface S12.

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

TABLE 1

In embodiment 1, the effective focal length f of the optical imaging lens is 1.80mm, the total length TTL of the optical imaging lens is 3.01mm, and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens is 1.79mm, and half of the maximum field angle Semi-FOV of the optical imaging lens is 45.5 °.

In embodiment 1, the surface of any one of the first lens E1 to the fourth lens E4 facing the object side and the surface facing the image side are both aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 aspherical i-th order. The following Table 2 shows the higher order coefficients A ₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈ and A ₂₀ that can be used for each of the aspherical mirrors S1-S8 in example 1.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.1087E-02

-5.9100E-03

-2.1989E-03

-1.4379E-03

-6.9001E-04

-3.9147E-04

-1.0750E-04

-2.3023E-05

3.1343E-05

S2

-8.0536E-02

-1.4523E-02

-1.9540E-03

-2.6229E-04

-1.9565E-04

-6.7340E-05

-4.1420E-05

1.3015E-05

1.0537E-06

S3

-2.4774E-01

-2.1236E-02

6.1264E-03

1.7169E-03

-4.7663E-04

-1.0921E-04

5.6997E-04

4.1943E-04

1.5568E-04

S4

-1.6951E-01

-2.3344E-02

-2.3674E-03

-1.2419E-03

-1.4296E-03

-3.1046E-04

2.3650E-04

3.0816E-04

6.9143E-05

S5

-5.2215E-02

-1.7070E-02

-8.0004E-03

-2.6878E-03

-1.4890E-03

-4.4217E-04

1.1682E-04

3.0825E-04

1.4395E-04

S6

4.8469E-02

2.2104E-02

1.6808E-02

4.2505E-03

7.4447E-04

1.9746E-03

6.0798E-05

3.6889E-04

-1.3157E-04

S7

-1.5991E+00

3.8691E-02

-6.4079E-03

1.5081E-02

2.2747E-02

-5.0219E-02

-8.7887E-03

1.1456E-02

1.7436E-02

S8

-2.1087E+00

-5.4079E-01

-2.5838E-01

-5.7231E-02

3.0371E-02

4.6606E-02

3.7539E-02

1.4123E-02

3.9800E-03

TABLE 2

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. Fig. 2B shows an astigmatism curve of the optical imaging lens of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents the 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 provided in 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 portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration of an optical imaging lens according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging lens of embodiment 2 sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, filter E5 and imaging surface S12.

In embodiment 2, the effective focal length f of the optical imaging lens is 1.80mm, the total length TTL of the optical imaging lens is 2.90mm, and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens is 1.79mm, and half of the maximum field angle Semi-FOV of the optical imaging lens is 45.5 °.

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

TABLE 3 Table 3

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.5228E-03

-1.8643E-02

5.3542E-03

7.6075E-03

-1.1789E-03

-7.1314E-03

-6.5082E-03

-3.0606E-03

-6.6716E-04

S2

-7.7663E-02

-3.6080E-02

-6.6666E-03

-2.4998E-04

6.5106E-04

3.0459E-04

-3.1990E-05

-9.5173E-05

-7.1586E-05

S3

-2.8737E-01

-2.9548E-02

8.4771E-03

-1.2465E-03

-9.3704E-03

-7.9707E-03

-3.7295E-03

-9.8490E-04

-1.2108E-04

S4

-1.4481E-01

1.3815E-02

1.1263E-02

7.2029E-03

3.2394E-03

2.0499E-03

8.3327E-04

2.4622E-04

4.0012E-05

S5

-7.8592E-02

-6.8141E-03

-3.9949E-02

4.0955E-03

8.5296E-03

1.7019E-03

1.2598E-03

1.5649E-03

7.6223E-04

S6

8.5774E-02

3.6339E-02

5.2082E-03

-6.6137E-03

-1.4954E-03

8.1188E-04

3.0080E-04

-1.1892E-05

-4.0116E-05

S7

8.0461E+02

2.1861E+02

-1.0237E+02

-7.7201E+01

1.6329E+01

1.9342E+01

-2.8929E+00

-1.7022E+00

-2.6671E-01

S8

-8.3074E+00

-1.0185E+00

2.3260E-02

1.4410E-01

-3.1974E-02

-4.9970E-03

-3.0031E-02

-2.3543E-02

-1.2124E-02

TABLE 4 Table 4

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. Fig. 4B shows an astigmatism curve of the optical imaging lens of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. 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 plane after light passes through the lens. As can be seen from fig. 4A to 4D, the optical imaging lens provided in 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. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 5 shows a schematic configuration diagram of an optical imaging lens according to embodiment 3 of the present application.

As shown in fig. 5, the optical imaging lens of embodiment 3 sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, filter E5 and imaging surface S12.

In embodiment 3, the effective focal length f of the optical imaging lens is 1.80mm, the total length TTL of the optical imaging lens is 3.03mm, and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens is 1.79mm, and half of the maximum field angle Semi-FOV of the optical imaging lens is 45.5 °.

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

TABLE 5

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

6.2031E-03

-9.9789E-03

-1.0981E-03

2.6907E-03

3.8802E-03

3.2697E-03

2.0056E-03

8.5687E-04

2.0419E-04

S2

-7.9587E-02

-1.6423E-02

-2.4102E-03

-4.5118E-04

-2.2201E-04

-8.5689E-05

-3.1886E-05

1.6760E-05

8.1855E-06

S3

-2.6127E-01

-3.2106E-02

1.9236E-03

1.4697E-03

-1.4689E-03

-8.8191E-04

3.0462E-05

3.3888E-04

1.2694E-04

S4

-1.6337E-01

-2.5347E-02

-5.5506E-03

1.8193E-03

-5.9240E-05

-3.7971E-04

-1.9562E-04

5.7594E-05

2.4798E-05

S5

-4.1069E-02

-1.5172E-02

-1.0947E-02

-1.7969E-03

-2.1972E-04

-7.4183E-04

2.1768E-04

4.4778E-04

2.2318E-04

S6

8.7526E-02

6.3849E-02

4.8922E-02

2.1710E-02

2.0164E-02

1.2811E-02

6.7956E-03

2.3718E-03

6.7069E-04

S7

1.1311E+01

1.8955E+00

-2.3782E+00

1.1923E+00

-8.7975E-01

6.4152E-01

-2.7075E-01

-4.9665E-02

6.8718E-02

S8

-3.5265E+00

-7.2220E-01

-2.7241E-01

6.1915E-03

-3.2470E-02

-6.0488E-02

-6.1490E-02

-2.9683E-02

-7.9385E-03

TABLE 6

Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve of the optical imaging lens of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents the 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 provided in 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. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 7 shows a schematic configuration diagram of an optical imaging lens according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging lens of embodiment 4 sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, filter E5 and imaging surface S12.

In embodiment 4, the effective focal length f of the optical imaging lens is 1.81mm, the total length TTL of the optical imaging lens is 3.02mm, and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens is 1.79mm, and half of the maximum field angle Semi-FOV of the optical imaging lens is 45.4 °.

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

TABLE 7

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-3.2242E-02

-3.0798E-02

1.3545E-02

3.1362E-03

-6.4191E-03

-1.8848E-03

5.0088E-03

4.7340E-03

1.6392E-03

S2

-6.5463E-02

-1.4829E-02

-2.7044E-03

-4.0090E-04

3.5578E-05

-2.4355E-05

-3.9796E-05

-3.7444E-05

2.8897E-05

S3

-2.7609E-01

-2.1608E-02

5.2048E-03

4.4384E-04

-2.3545E-03

-1.8948E-03

-6.6097E-04

5.7911E-05

8.5926E-05

S4

-1.8021E-01

-2.5987E-02

1.8563E-03

6.6773E-03

-2.9072E-03

-7.7308E-04

-9.0615E-04

-3.4993E-04

-3.5336E-04

S5

4.8941E-03

-3.9649E-02

-2.0901E-02

-4.0507E-03

-8.5728E-03

-3.1258E-03

-1.4326E-03

-5.3731E-04

-2.9768E-04

S6

3.8276E-01

-1.6260E-02

-4.5641E-03

4.1252E-02

7.1168E-03

7.9554E-03

7.9106E-03

-4.1926E-03

-5.8218E-03

S7

1.7127E+00

3.7123E-01

-6.0277E-01

3.5329E-01

-2.5046E-01

1.0290E-01

-4.8723E-02

-1.3615E-02

1.0505E-01

S8

-3.5947E+00

7.8148E-01

-1.5113E-01

-1.0855E-01

8.3379E-02

5.3058E-02

-4.0437E-02

-2.6132E-02

-4.2158E-03

TABLE 8

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve of the optical imaging lens of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the optical imaging lens provided in 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. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 9 shows a schematic configuration of an optical imaging lens according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging lens of embodiment 5 sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, filter E5 and imaging surface S12.

In embodiment 5, the effective focal length f of the optical imaging lens is 1.80mm, the total length TTL of the optical imaging lens is 2.97mm, and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens is 1.79mm, and half of the maximum field angle Semi-FOV of the optical imaging lens is 45.5 °.

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

TABLE 9

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.3122E-03

-1.8416E-02

2.0762E-03

6.6580E-03

2.9527E-03

-1.3334E-03

-2.5709E-03

-1.6111E-03

-4.3245E-04

S2

-7.4224E-02

-2.1512E-02

-4.3380E-03

-6.6453E-04

-2.2356E-04

-4.3634E-05

-3.8137E-05

1.3396E-05

-1.8358E-05

S3

-2.7862E-01

-2.5493E-02

7.5098E-03

-1.4153E-03

-5.9272E-03

-3.3354E-03

-3.8839E-05

7.8658E-04

3.6405E-04

S4

-1.6650E-01

3.0306E-02

2.0210E-02

5.4720E-04

-6.2808E-03

-4.4228E-03

-1.8805E-03

-5.8932E-04

-6.5120E-05

S5

-1.5472E-01

6.2345E-03

-3.1348E-02

6.9182E-03

2.0720E-03

-8.8974E-03

-3.7845E-03

1.9278E-03

1.9624E-03

S6

1.4256E-01

1.0635E-01

1.6923E-02

-8.6775E-03

-9.4064E-03

-9.8719E-03

-9.7675E-03

-4.5404E-03

-1.4493E-03

S7

-1.4457E+01

-1.8518E+00

3.0796E-01

-3.3886E-01

-4.3349E-01

7.3734E-01

-7.0424E-01

3.7761E-01

-1.3976E-01

S8

-1.9502E+00

-3.4330E-01

-2.7662E-01

-1.0148E-01

-5.7368E-02

-1.3011E-02

-4.9951E-03

-3.4329E-04

-7.5797E-04

Table 10

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve of the optical imaging lens of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the optical imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the optical imaging lens provided in 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. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 11 shows a schematic structural diagram of an optical imaging lens according to embodiment 6 of the present application.

As shown in fig. 11, the optical imaging lens of embodiment 1 sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, filter E5 and imaging surface S12.

In embodiment 6, the effective focal length f of the optical imaging lens is 1.81mm, the total length TTL of the optical imaging lens is 2.94mm, and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens is 1.79mm, and half of the maximum field angle Semi-FOV of the optical imaging lens is 45.4 °.

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

TABLE 11

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-5.7802E-02

-2.3748E-02

1.1310E-02

-1.0666E-03

-5.0453E-03

1.3572E-03

5.0093E-03

3.1219E-03

7.5507E-04

S2

-7.6722E-02

-1.0571E-02

-1.1546E-03

3.2467E-04

5.6720E-05

6.7963E-05

-3.6559E-05

2.0183E-05

-2.2770E-05

S3

-2.5162E-01

-6.5444E-03

9.7053E-03

2.6189E-03

-1.0387E-03

-5.9759E-04

2.2817E-05

2.2490E-04

1.7726E-05

S4

-2.3801E-01

-3.5503E-02

1.2111E-03

1.8750E-03

-1.5059E-03

3.0118E-05

2.2869E-04

4.0270E-04

7.4996E-05

S5

-7.1697E-02

-4.2526E-02

-1.3283E-02

-3.1190E-03

-4.3162E-03

-2.8221E-03

-1.6304E-03

-6.8999E-04

-1.6945E-04

S6

1.3252E-01

5.7900E-02

3.8561E-02

6.9536E-03

-4.0513E-03

-9.1889E-05

1.8310E-03

1.7079E-03

1.0204E-04

S7

1.7742E+00

7.3702E-01

-6.3065E-01

2.8682E-01

-1.8630E-01

-1.7335E-01

6.7255E-02

6.0317E-02

4.8026E-02

S8

-8.3940E+00

1.1757E+00

-3.5068E-01

-1.9534E-01

1.8687E-01

5.9500E-02

-7.0958E-02

-9.0551E-03

1.0648E-02

Table 12

Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 6, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve of the optical imaging lens of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the optical imaging lens of embodiment+ which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment+ that represents deviations of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, the optical imaging lens provided in 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. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 13 shows a schematic configuration diagram of an optical imaging lens according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging lens of embodiment 7 sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, filter E5 and imaging surface S12.

In embodiment 7, the effective focal length f of the optical imaging lens is 1.80mm, the total length TTL of the optical imaging lens is 2.91mm, and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens is 1.79mm, and half of the maximum field angle Semi-FOV of the optical imaging lens is 45.5 °.

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

TABLE 13

TABLE 14

Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 7, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve of the optical imaging lens of embodiment 7, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14C shows a distortion curve of the optical imaging lens of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 7, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 14A to 14D, the optical imaging lens provided in embodiment 7 can achieve good imaging quality.

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

Condition/example	1	2	3	4	5	6	7
								R1/(CT1-T12)	5.42	7.35	6.33	6.49	8.40	10.04	5.69
(R2-f1)/(R7+R8)	1.52	0.14	1.24	1.05	0.55	2.01	1.71
								∑CT/T23-CT4/T34	2.98	5.93	2.32	15.49	5.58	1.62	8.40
(f3-R5)/T23	22.41	24.47	18.26	53.49	24.26	22.92	27.95
								(∑CT-∑AT)/(CT2+CT3)	1.43	1.27	1.33	1.37	1.25	1.26	1.40
R3/TD	-17.82	-5.61	-12.72	-7.82	-7.07	-5.18	-19.22
								(f∑AT)/(R4T34)	-0.22	-2.14	-0.95	2.21	-1.60	0.90	0.79

TABLE 15

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

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims

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

the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface;

The second lens element with negative refractive power has a concave object-side surface;

the third lens element with positive refractive power has a concave object-side surface and a convex image-side surface;

The fourth lens element with negative refractive power has a convex object-side surface and a concave image-side surface;

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

The optical imaging lens satisfies the following conditions:

1.5 < ΣCT/T23-CT4/T34 < 15.5,0 < (R2-f 1)/(R7+R8) < 2.5, -20.0 < R3/TD < -5.0, and 18.0 < (f 3-R5)/T23 < 53.5,

Wherein Σct is the sum of the thicknesses of the centers of the first lens and the fourth lens on the optical axis, T23 is the air space between the second lens and the third lens on the optical axis, T34 is the air space between the third lens and the fourth lens on the optical axis, CT4 is the thickness of the center of the fourth lens on the optical axis, R2 is the radius of curvature of the surface of the first lens facing the image side, R3 is the radius of curvature of the surface of the second lens facing the object side, R5 is the radius of curvature of the surface of the third lens facing the object side, R7 is the radius of curvature of the surface of the fourth lens facing the object side, R8 is the radius of curvature of the surface of the fourth lens facing the image side, f1 is the effective focal length of the first lens, f3 is the effective focal length of the third lens, and TD is the axial distance of the surface of the first lens facing the object side to the surface of the fourth lens facing the image side.

2. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies:

5.0＜R1/(CT1-T12)＜10.5，

Wherein R1 is a radius of curvature of a surface of the first lens facing the object side, CT1 is a center thickness of the first lens on the optical axis, and T12 is an air gap between the first lens and the second lens on the optical axis.

3. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies:

1.0＜(∑CT-∑AT)/(CT2+CT3)＜1.5，

Wherein Σat is the sum of the air intervals on the optical axis of any two adjacent lenses from the first lens to the fourth lens, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

4. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies:

-2.5＜(f*∑AT)/(R4*T34)＜2.5，

Wherein f is an effective focal length of the optical imaging lens, R4 is a radius of curvature of a surface of the second lens facing the image side, T34 is an air space between the third lens and the fourth lens on the optical axis, and Σat is a sum of air spaces between any two adjacent lenses of the first lens to the fourth lens on the optical axis.

5. The optical imaging lens according to any one of claims 1 to 4, wherein the optical imaging lens is applied to a near infrared lens of a near infrared band.