CN212623293U

CN212623293U - Optical imaging lens

Info

Publication number: CN212623293U
Application number: CN202020918239.8U
Authority: CN
Inventors: 叶丽慧; 闻人建科; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2021-02-26
Anticipated expiration: 2030-05-26

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 positive refractive power, an object-side surface of which is convex; a second lens with focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; and a third lens with a focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following conditions: f/EPD is less than 1.2; and the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: CT1/CT2 are more than 0 and less than or equal to 0.6.

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 increasing application of AR (Augmented Reality) and VR (Virtual Reality) technologies to portable electronic products such as mobile phones, 3D TOF (Time of flight) sensors are becoming the core chip and the standard of portable electronic products such as mobile phones.

In order to meet the demand for miniaturization of portable electronic products such as mobile phones, the optical imaging lens applied to the portable electronic products such as mobile phones needs to use as few lenses as possible to shorten the total length of the lens, but the optical imaging lens has a reduced design freedom and is difficult to meet the demand for imaging quality.

SUMMERY OF THE UTILITY MODEL

An aspect of the present application 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 positive refractive power, an object-side surface of which is convex; a second lens with focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; and a third lens with a focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface. The total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens can satisfy the following conditions: f/EPD is less than 1.2; and the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis can satisfy: CT1/CT2 are more than 0 and less than or equal to 0.6.

In one embodiment, the object-side surface of the first lens element and the image-side surface of the third lens element have at least one aspherical mirror surface.

In one embodiment, the total effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens can satisfy: f/f1 is more than 0.5 and less than 1.5.

In one embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy: 0.3 < R3/(R3+ R4) < 0.8.

In one embodiment, 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: 0.3 < R6/R5 < 1.3.

In one embodiment, a distance BFL on the optical axis from the image-side surface of the third lens to the imaging surface of the optical imaging lens and a distance TD on the optical axis from the object-side surface of the first lens to the image-side surface of the third lens may satisfy: BFL/TD is more than 0.3 and less than 0.8.

In one embodiment, the edge thickness ET1 of the first lens and the edge thickness ET2 of the second lens may satisfy: 0.2 < ET1/ET2 < 0.6.

In one embodiment, the separation distance T12 between the first lens and the second lens on the optical axis and the separation distance T23 between the second lens and the third lens on the optical axis may satisfy: 0.3 < | T12-T23|/(T12+ T23) < 1.0.

In one embodiment, the central thickness CT3 of the third lens on the optical axis and the edge thickness ET3 of the third lens can satisfy: 0.5 < CT3/ET3 < 1.0.

In one embodiment, a distance SAG22 on the optical axis from the intersection point of the image-side surface of the second lens and the optical axis to the effective radius vertex of the image-side surface of the second lens and a distance SAG32 on the optical axis from the intersection point of the image-side surface of the third lens and the optical axis to the effective radius vertex of the image-side surface of the third lens may satisfy: -1.0 < SAG32/SAG22 < -0.5.

In one embodiment, the working wavelength band lambda of the optical imaging lens is 8000nm-14000 nm.

Another aspect of the present application further 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 positive refractive power, an object-side surface of which is convex; a second lens with focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; and a third lens with a focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface. The working wave band lambda of the optical imaging lens is 8000nm-14000 nm.

This application has adopted three lens, through the focal power of rational distribution each lens, face type, the center thickness of each lens and the epaxial interval between each lens etc for above-mentioned optical imaging lens has big light ring, high imaging quality, can be used to at least one beneficial effect such as TOF camera.

Drawings

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

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

fig. 2A to 2C show an astigmatism curve, a distortion curve, and a relative illuminance 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 4C show an astigmatism curve, a distortion curve, and a relative illuminance 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 6C show an astigmatism curve, a distortion curve, and a relative illuminance 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 8C show an astigmatism curve, a distortion curve, and a relative illuminance 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 10C show an astigmatism curve, a distortion curve, and a relative illuminance 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; and

fig. 12A to 12C show an astigmatism curve, a distortion curve, and a relative illuminance curve, respectively, of the optical imaging lens of embodiment 6.

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 used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens 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, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

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, for example, three lenses having optical powers, a first lens, a second lens, and a third lens. The three 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 third lens can have a spacing distance therebetween.

In an exemplary embodiment, the first lens may have a positive optical power, and the object-side surface thereof may be convex; the second lens has positive focal power or negative focal power, the object side surface can be a concave surface, and the image side surface can be a convex surface; and the third lens element can have positive or negative power, and its object-side surface can be convex and its image-side surface can be concave. By reasonably controlling the positive and negative distribution of the focal power of each lens of the system and the light inlet quantity, the low-order aberration of the system can be effectively balanced and controlled.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: f/EPD < 1.2, where f is the total effective focal length of the optical imaging lens and EPD is the entrance pupil diameter of the optical imaging lens. The f/EPD is less than 1.2, so that the optical imaging system has a larger aperture and the integral brightness of imaging is improved.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < CT1/CT2 < 0.6, wherein CT1 is the central thickness of the first lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis. More specifically, CT1 and CT2 further satisfy: CT1/CT2 is more than 0.4 and less than or equal to 0.6. The requirement of 0 < CT1/CT2 is less than or equal to 0.6, the size distribution of the lens is uniform, and the assembly stability is ensured.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.5 < f/f1 < 1.5, wherein f is the total effective focal length of the optical imaging lens, and f1 is the effective focal length of the first lens. More specifically, f and f1 further satisfy: f/f1 is more than 0.5 and less than 1.4. Satisfying f/f1 of 0.5 < 1.5 can increase the total effective focal length of the lens and is beneficial to balancing the curvature of field.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.3 < R3/(R3+ R4) < 0.8, wherein R3 is a radius of curvature of an object-side surface of the second lens, and R4 is a radius of curvature of an image-side surface of the second lens. More specifically, R3 and R4 may further satisfy: 0.4 < R3/(R3+ R4) < 0.7. Satisfying 0.3 < R3/(R3+ R4) < 0.8 helps to reduce spherical aberration and astigmatism generation.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.3 < R6/R5 < 1.3, wherein R5 is a radius of curvature of an object-side surface of the third lens, and R6 is a radius of curvature of an image-side surface of the third lens. More specifically, R6 and R5 may further satisfy: 0.4 < R6/R5 < 1.1. The requirement that R6/R5 is more than 0.3 and less than 1.3 is met, the curvature of field of the system can be effectively controlled, and the image quality of the system is improved.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.3 < BFL/TD < 0.8, wherein BFL is the distance on the optical axis from the image side surface of the third lens to the imaging surface of the optical imaging lens, and TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the third lens. More specifically, BFL and TD may further satisfy: BFL/TD is more than 0.3 and less than 0.6. The requirement that BFL/TD is more than 0.3 and less than 0.8 is met, the whole thickness and the imaging quality of the lens are favorably controlled, and then each lens is well matched with the lens barrel, so that each lens has good assembly manufacturability. Therefore, the overall length of the optical system is favorably reduced, each lens is conveniently matched with the lens barrel better, and the processing difficulty of the optical system is favorably reduced.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.2 < ET1/ET2 < 0.6, wherein ET1 is the edge thickness of the first lens and ET2 is the edge thickness of the second lens. The condition that ET1/ET2 is more than 0.2 and less than 0.6 is met, the space utilization rate is improved, and the first lens and the second lens can be well suitable for systems with limited sizes.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.3 < | T12-T23|/(T12+ T23) < 1.0, wherein T12 is a separation distance of the first lens and the second lens on the optical axis, and T23 is a separation distance of the second lens and the third lens on the optical axis. More specifically, T12 and T23 may further satisfy: 0.4 < | T12-T23|/(T12+ T23) < 0.9. The condition that the absolute value of T12-T23I (T12+ T23) < 1.0 is met, the size distribution of the lens is uniform, and the processing and assembling difficulty of the lens is reduced.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.5 < CT3/ET3 < 1.0, wherein CT3 is the central thickness of the third lens on the optical axis and ET3 is the edge thickness of the third lens. More specifically, CT3 and ET3 further satisfy: 0.5 < CT3/ET3 < 0.9. The requirement that CT3/ET3 is more than 0.5 and less than 1.0 is met, the incident light can be controlled to enter and exit the optical imaging system, and the lens has better capability of eliminating distortion.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -1.0 < SAG32/SAG22 < -0.5, wherein SAG22 is a distance on the optical axis from the intersection point of the image-side surface of the second lens and the optical axis to the vertex of the effective radius of the image-side surface of the second lens, and SAG32 is a distance on the optical axis from the intersection point of the image-side surface of the third lens and the optical axis to the vertex of the effective radius of the image-side surface of the third lens. More specifically, SAG32 and SAG22 further may satisfy: -0.9 < SAG32/SAG22 < -0.7. Satisfy-1.0 < SAG32/SAG22 < 0.5, can have greater refractive power to the off-axis field of view, thus be favorable to shortening the whole length of lens, still be favorable to promoting the resolving power of the system.

In an exemplary embodiment, the operating wavelength band λ of the optical imaging lens may be in the range of 8000nm-14000 nm. The working wave band lambda is within the range of 8000nm-14000nm, the working wave band of the lens can be ensured to be a far infrared spectrum, other wave bands can be effectively filtered, and the influence of other wave bands on the imaging of the lens is obviously reduced.

In an exemplary embodiment, the optical imaging lens according to the present application may further include a stop disposed between the first to third lenses, for example, between the first and second lenses. 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 far infrared working wavelength, large aperture, good imaging quality and the like. The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above three lenses. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, 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 beneficial to 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 third 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, and the third lens is an aspheric mirror surface. Optionally, the object-side surface and the image-side surface of each of the first lens, the second lens, and the third lens 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 three lenses are exemplified in the embodiment, the optical imaging lens is not limited to including three 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 2C. 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: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a filter E4 and an imaging surface S9.

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

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 2.70mm, 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 S9 of the optical imaging lens) is 4.22mm, half ImgH of the diagonal length of the effective pixel region on the imaging surface S9 of the optical imaging lens is 1.43mm, the maximum half field angle Semi-FOV of the optical imaging lens is 27.6 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.15.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the third lens E3 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S6 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-6.5137E-02

-5.6291E-02

-3.1764E-03

2.8613E-03

1.3262E-03

2.4110E-05

-1.1116E-04

0.0000E+00

S2

3.8691E-02

-3.6457E-02

2.3894E-03

3.0866E-03

5.7557E-04

-1.1777E-04

-4.3835E-05

5.3927E-05

-3.6650E-06

S3

5.1626E-01

-2.9131E-02

1.8327E-02

-1.7052E-03

-5.7783E-04

-5.1338E-04

2.5185E-04

0.0000E+00

S4

-2.1198E-01

1.8294E-02

1.4740E-03

9.9330E-04

7.0954E-04

2.0289E-06

1.1547E-04

0.0000E+00

S5

5.5284E-02

-1.0490E-01

1.9686E-02

-6.9362E-03

1.9760E-03

-8.4389E-04

3.2966E-04

0.0000E+00

S6

-3.3313E-01

-1.2456E-02

7.1004E-03

-1.5500E-03

3.2085E-04

-1.6526E-04

0.0000E+00

TABLE 2

Fig. 2A shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2B shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2C shows a relative illuminance curve of the optical imaging lens of embodiment 1, which represents relative illuminance magnitude values corresponding to different image heights. As can be seen from fig. 2A to 2C, the optical imaging lens 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 4C. 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: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a filter E4 and an imaging surface S9.

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

In this example, the total effective focal length f of the optical imaging lens is 2.65mm, the total length TTL of the optical imaging lens is 4.16mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S9 of the optical imaging lens is 1.43mm, the maximum half field angle Semi-FOV of the optical imaging lens is 28.0 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.15.

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-4.0955E-02

-5.5278E-02

-4.7730E-03

1.5706E-03

8.3060E-04

1.4254E-04

3.4123E-05

0.0000E+00

S2

4.1702E-02

-4.0182E-02

1.0762E-03

2.8409E-03

2.1672E-04

-2.4497E-05

-6.2725E-05

6.2555E-05

-1.4371E-05

S3

3.4149E-01

-2.5393E-02

1.8352E-02

3.9559E-04

-9.1747E-04

-8.1877E-04

8.0335E-05

0.0000E+00

S4

-1.9425E-01

2.3432E-02

4.2125E-03

2.3300E-03

1.1131E-03

2.0345E-04

1.2801E-04

0.0000E+00

S5

8.9785E-02

-1.0504E-01

1.8917E-02

-7.0312E-03

2.2208E-03

-7.1243E-04

4.4861E-04

0.0000E+00

S6

-2.9066E-01

-2.2271E-02

6.9411E-03

-8.2656E-04

5.1740E-04

9.2169E-05

0.0000E+00

TABLE 4

Fig. 4A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4B shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4C shows a relative illuminance curve of the optical imaging lens of embodiment 2, which represents relative illuminance magnitude values corresponding to different image heights. As can be seen from fig. 4A to 4C, 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 6C. Fig. 5 shows a schematic structural diagram 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: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a filter E4 and an imaging surface S9.

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

In this example, the total effective focal length f of the optical imaging lens is 2.81mm, the total length TTL of the optical imaging lens is 4.28mm, a half ImgH of the diagonal length of the effective pixel area on the imaging plane S9 of the optical imaging lens is 1.43mm, the maximum half field angle Semi-FOV of the optical imaging lens is 26.6 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.15.

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). Table 6 shows 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 formula (1) given in example 1 above.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-7.9244E-02

-5.7229E-02

-3.5224E-03

3.1609E-03

1.4840E-03

7.4978E-05

-1.4539E-04

0.0000E+00

S2

3.1399E-02

-3.6305E-02

2.6484E-03

3.1464E-03

7.4265E-04

-1.2876E-04

-1.7824E-05

4.4578E-05

1.2704E-05

S3

5.7912E-01

-2.6586E-02

2.0954E-02

-1.7923E-03

-5.6355E-04

-4.3511E-04

2.8572E-04

0.0000E+00

S4

-2.0661E-01

7.9089E-03

8.0252E-03

-1.4861E-03

2.2645E-03

-4.4668E-04

4.5930E-04

0.0000E+00

S5

5.8441E-02

-1.1487E-01

2.4797E-02

-7.1661E-03

2.7413E-03

-7.4831E-04

3.6182E-04

0.0000E+00

S6

-3.0508E-01

-1.4336E-02

8.0243E-03

-9.6158E-04

3.2536E-04

1.7465E-05

0.0000E+00

TABLE 6

Fig. 6A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6B shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6C shows a relative illuminance curve of the optical imaging lens of embodiment 3, which represents relative illuminance magnitude values corresponding to different image heights. As can be seen from fig. 6A to 6C, 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 8C. 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: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a filter E4 and an imaging surface S9.

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

In this example, the total effective focal length f of the optical imaging lens is 3.01mm, the total length TTL of the optical imaging lens is 4.53mm, half ImgH of the diagonal length of the effective pixel area on the imaging plane S9 of the optical imaging lens is 1.43mm, the maximum half field angle Semi-FOV of the optical imaging lens is 24.9 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.17.

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). Table 8 shows 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 formula (1) given in example 1 above.

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-8.6393E-02

-5.5969E-02

-1.4975E-03

2.9216E-03

1.0174E-03

-6.8420E-05

-1.4368E-04

0.0000E+00

S2

3.2621E-02

-3.8668E-02

6.8551E-03

2.8682E-03

2.2500E-04

-1.1990E-04

-1.1799E-05

5.0913E-05

-1.1600E-05

S3

6.1738E-01

-4.1770E-02

2.5221E-02

-2.5649E-03

-2.4989E-04

-5.7844E-04

2.7014E-04

0.0000E+00

S4

-2.1682E-01

2.9277E-02

-4.4565E-03

2.9301E-03

-5.1485E-04

3.7294E-04

-5.6457E-05

0.0000E+00

S5

-4.5777E-02

-8.1963E-02

1.3012E-02

-3.8865E-03

8.3346E-04

-4.4814E-04

1.4519E-04

0.0000E+00

S6

-2.9638E-01

-1.6060E-02

9.1599E-03

-2.1389E-03

5.3848E-04

-1.9798E-04

0.0000E+00

TABLE 8

Fig. 8A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8B shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8C shows a relative illuminance curve of the optical imaging lens of embodiment 4, which represents relative illuminance magnitude values corresponding to different image heights. As can be seen from fig. 8A to 8C, 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 10C. 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: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a filter E4 and an imaging surface S9.

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

In this example, the total effective focal length f of the optical imaging lens is 3.15mm, the total length TTL of the optical imaging lens is 4.76mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S9 of the optical imaging lens is 1.43mm, the maximum half field angle Semi-FOV of the optical imaging lens is 23.9 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.19.

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
						S1	-7.8624E-02	-3.7266E-02	-2.5871E-03	7.4395E-04	3.7964E-04
S2	-6.7300E-03	-2.6735E-02	1.9853E-03	2.2140E-03	1.8369E-04
						S3	6.4387E-01	-2.2424E-02	1.1182E-02	-1.4401E-03	3.2428E-04
S4	-1.7233E-01	2.7943E-02	-6.1560E-03	2.9752E-03	-4.7440E-04
						S5	-2.3692E-01	-3.7716E-02	1.4603E-02	-2.4213E-03	1.9364E-03
S6	-3.9054E-01	2.5688E-02	2.9798E-03	-4.1359E-05	1.2693E-03

TABLE 10-1

Flour mark	A14	A16	A18	A20	A22
						S1	1.1589E-04	-6.3590E-05	0.0000E+00	0.0000E+00	0.0000E+00
S2	1.5748E-04	-3.8556E-06	5.9582E-05	2.8224E-05	0.0000E+00
						S3	-7.9788E-05	-7.9862E-06	0.0000E+00	0.0000E+00	0.0000E+00
S4	3.3193E-04	-7.6662E-05	-3.9246E-06	-2.7368E-07	0.0000E+00
						S5	-4.1556E-04	2.5975E-04	-2.6851E-05	-2.8618E-05	-6.1471E-05
S6	-1.0674E-04	0.0000E+00	0.0000E+00	0.0000E+00	0.0000E+00

TABLE 10-2

Fig. 10A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 5. Fig. 10B shows a distortion curve of the optical imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10C shows a relative illuminance curve of the optical imaging lens of embodiment 5, which represents relative illuminance magnitude values corresponding to different image heights. As can be seen from fig. 10A to 10C, 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 12C. 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: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a filter E4 and an imaging surface S9.

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

In this example, the total effective focal length f of the optical imaging lens is 2.48mm, the total length TTL of the optical imaging lens is 3.84mm, half ImgH of the diagonal length of the effective pixel area on the imaging plane S9 of the optical imaging lens is 1.43mm, the maximum half field angle Semi-FOV of the optical imaging lens is 29.6 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.15.

Table 11 shows a basic parameter table of the optical imaging lens of embodiment 6, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 12 shows 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 formula (1) given in example 1 above.

TABLE 11

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-3.4039E-02

-5.4042E-02

-3.8531E-03

2.0438E-03

1.1654E-03

1.6380E-04

-1.0973E-04

0.0000E+00

S2

1.4108E-02

-3.6323E-02

2.7067E-03

2.8160E-03

5.9144E-04

-6.2994E-05

-1.6770E-05

3.9414E-05

1.4858E-05

S3

2.6052E-01

-1.9530E-02

1.4421E-02

9.5495E-04

-2.7235E-04

-5.5425E-04

6.8580E-05

0.0000E+00

S4

-1.7989E-01

1.1414E-02

3.5480E-03

-1.5491E-04

1.2437E-03

-1.5671E-04

2.2867E-04

0.0000E+00

S5

6.9082E-02

-1.1259E-01

2.2322E-02

-7.5459E-03

2.9512E-03

-6.9069E-04

5.4949E-04

0.0000E+00

S6

-3.0064E-01

-9.7330E-03

4.5851E-03

3.6539E-04

2.6374E-04

2.4698E-04

0.0000E+00

TABLE 12

Fig. 12A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 6. Fig. 12B shows a distortion curve of the optical imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12C shows a relative illuminance curve of the optical imaging lens of embodiment 6, which represents relative illuminance magnitude values corresponding to different image heights. As can be seen from fig. 12A to 12C, the optical imaging lens according to embodiment 6 can achieve good imaging quality.

In summary, examples 1 to 6 each satisfy the relationship shown in table 13.

Conditions/examples	1	2	3	4	5	6
							CT1/CT2	0.42	0.45	0.46	0.60	0.47	0.45
f/f1	0.76	0.57	0.80	0.85	1.30	0.66
							R3/(R3+R4)	0.53	0.61	0.63	0.42	0.42	0.64
R6/R5	0.86	0.91	0.50	0.99	0.74	0.73
							BFL/TD	0.53	0.54	0.51	0.54	0.39	0.58
ET1/ET2	0.40	0.55	0.46	0.56	0.26	0.46
							\|T12-T23\|/(T12+T23)	0.84	0.86	0.49	0.83	0.46	0.83
CT3/ET3	0.77	0.80	0.70	0.78	0.60	0.70
							SAG32/SAG22	-0.79	-0.87	-0.71	-0.87	-0.73	-0.78

Watch 13

The application also provides an imaging device, and the electronic photosensitive element can be a photosensitive coupling element (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

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 a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned 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 assembly, 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 with focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; and

a third lens with focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;

the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD is less than 1.2; and

a center thickness CT1 of the first lens on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy: CT1/CT2 are more than 0 and less than or equal to 0.6.

2. The optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: f/f1 is more than 0.5 and less than 1.5.

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

4. The optical imaging lens of claim 1, wherein 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: 0.3 < R6/R5 < 1.3.

5. The optical imaging lens of claim 1, wherein a distance BFL between an image side surface of the third lens and an image plane of the optical imaging lens on the optical axis and a distance TD between an object side surface of the first lens and the image side surface of the third lens on the optical axis satisfy: BFL/TD is more than 0.3 and less than 0.8.

6. The optical imaging lens of claim 1, wherein the edge thickness ET1 of the first lens and the edge thickness ET2 of the second lens satisfy: 0.2 < ET1/ET2 < 0.6.

7. The optical imaging lens according to claim 1, wherein a separation distance T12 between the first lens and the second lens on the optical axis and a separation distance T23 between the second lens and the third lens on the optical axis satisfy: 0.3 < | T12-T23|/(T12+ T23) < 1.0.

8. The optical imaging lens of claim 1, wherein a center thickness CT3 of the third lens on the optical axis and an edge thickness ET3 of the third lens satisfy: 0.5 < CT3/ET3 < 1.0.

9. The optical imaging lens of claim 1, wherein a distance SAG22 on the optical axis from an intersection point of the image-side surface of the second lens and the optical axis to an effective radius vertex of the image-side surface of the second lens to a distance SAG32 on the optical axis from an intersection point of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens satisfies: -1.0 < SAG32/SAG22 < -0.5.

10. The optical imaging lens of claim 1, wherein the working wavelength band λ of the optical imaging lens is 8000nm-14000 nm.

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

the working wave band lambda of the optical imaging lens is 8000nm-14000 nm.

12. The optical imaging lens of claim 11, wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.2.

13. The optical imaging lens of claim 11, wherein a central thickness CT1 of the first lens on the optical axis and a central thickness CT2 of the second lens on the optical axis satisfy: CT1/CT2 are more than 0 and less than or equal to 0.6.

14. The optical imaging lens of claim 11, wherein the total effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: f/f1 is more than 0.5 and less than 1.5.

15. The optical imaging lens of claim 11, wherein the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: 0.3 < R3/(R3+ R4) < 0.8.

16. The optical imaging lens of claim 11, wherein 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: 0.3 < R6/R5 < 1.3.

17. The optical imaging lens of claim 11, wherein a distance BFL between an image side surface of the third lens element and an image plane of the optical imaging lens on the optical axis and a distance TD between an object side surface of the first lens element and the image side surface of the third lens element on the optical axis satisfy: BFL/TD is more than 0.3 and less than 0.8.

18. The optical imaging lens of claim 11, wherein a separation distance T12 between the first lens and the second lens on the optical axis and a separation distance T23 between the second lens and the third lens on the optical axis satisfy: 0.3 < | T12-T23|/(T12+ T23) < 1.0.

19. The optical imaging lens of claim 11, wherein a center thickness CT3 of the third lens on the optical axis and an edge thickness ET3 of the third lens satisfy: 0.5 < CT3/ET3 < 1.0.

20. The optical imaging lens of claim 11, wherein a distance SAG22 on the optical axis from an intersection point of the image-side surface of the second lens and the optical axis to an effective radius vertex of the image-side surface of the second lens to a distance SAG32 on the optical axis from an intersection point of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens satisfies: -1.0 < SAG32/SAG22 < -0.5.

21. The optical imaging lens of claim 11, wherein the edge thickness ET1 of the first lens and the edge thickness ET2 of the second lens satisfy: 0.2 < ET1/ET2 < 0.6.