CN213957733U

CN213957733U - Optical imaging lens

Info

Publication number: CN213957733U
Application number: CN202120199955.XU
Authority: CN
Inventors: 闻人建科; 赵烈烽; 戴付建
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2021-08-13
Anticipated expiration: 2031-01-25

Abstract

The application discloses optical imaging lens includes following preface from object side to image side along optical axis: a first lens having a negative optical power; a second lens having a positive optical power; a third lens; a fourth lens having a positive optical power; a fifth lens having a negative optical power; a sixth lens having positive optical power; and a seventh lens. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and half of the Semi-FOV of the maximum field angle of the optical imaging lens meet the following conditions: TTL/Tan (Semi-FOV) <1.0 mm; and the total effective focal length f of the optical imaging lens, the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -5.0< f/(R11-R12) < -2.0.

Description

Optical imaging lens

Technical Field

The present application relates to the field of optical elements, and more particularly, to an optical imaging lens.

Background

In recent years, portable electronic products having a camera function have been increasingly developed, and the quality of an image formed by a lens as an important component of a camera system has been receiving more and more attention.

With the rapid development of camera systems of portable electronic products, higher requirements are put on optical imaging lenses. In order to provide a high-quality photographing function to a user in all directions, a large-field optical imaging lens having a higher imaging quality has become a trend of lens development. The wide-angle lens has the characteristics of large field angle and long scene depth, so that the wide-angle lens can easily bring a sense of perspective to a photographer and is favorable for enhancing the infectivity of pictures. However, the wide-angle lens generally has a problem of imaging quality such as a large vertical axis chromatic aberration, resulting in poor imaging effect. How to realize the super wide angle of the lens while improving the imaging quality is one of the problems to be solved urgently in the field of lenses.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical imaging lens, sequentially comprising, from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having a positive optical power; a third lens; a fourth lens having a positive optical power; a fifth lens having a negative optical power; a sixth lens having positive optical power; and a seventh lens. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and half of the Semi-FOV of the maximum field angle of the optical imaging lens can satisfy the following conditions: TTL/Tan (Semi-FOV) <1.0 mm; and the total effective focal length f of the optical imaging lens, the radius of curvature R11 of the object-side surface of the sixth lens, and the radius of curvature R12 of the image-side surface of the sixth lens may satisfy: -5.0< f/(R11-R12) < -2.0.

In some embodiments, the effective focal length f7 of the seventh lens and the effective focal length f6 of the sixth lens may satisfy: 1.0< f7/f6< 2.0.

In some embodiments, the effective focal length f2 of the second lens and the effective focal length f1 of the first lens may satisfy: 3.5< f2/f1 is less than or equal to-3.0.

In some embodiments, the total effective focal length f of the optical imaging lens, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens may satisfy: -2.5< f/(f4+ f5) < -2.0.

In some embodiments, the effective focal length f2 of the second lens, 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: -1.5< f2/(R3+ R4) < -0.8.

In some embodiments, the total effective focal length f of the optical imaging lens, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis may satisfy: 4.5< f/CT2+ f/CT4< 5.5.

In some embodiments, the total effective focal length f of the optical imaging lens and the separation distance T45 between the fourth lens and the fifth lens on the optical axis may satisfy: 2.5< f/T45< 3.5.

In some embodiments, the total effective focal length f of the optical imaging lens and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 1.5< f/CT7< 2.5.

In some embodiments, the effective focal length f1 of the first lens and the radius of curvature R1 of the object side of the first lens may satisfy: 0< f1/R1< 0.2.

In some embodiments, the radius of curvature R10 of the image-side surface of the fifth lens and the radius of curvature R9 of the object-side surface of the fifth lens may satisfy: -3.0< R10/R9< -2.0.

In some embodiments, the total effective focal length f of the optical imaging lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens may satisfy: 11< f/(R5-R6) < 15.

In some embodiments, the effective radius DT11 of the object side surface of the first lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy: 2.5< DT11/EPD < 3.5.

The present application further provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens having a negative optical power; a second lens having a positive optical power; a third lens; a fourth lens having a positive optical power; a fifth lens having a negative optical power; a sixth lens having positive optical power; and a seventh lens. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and half of the Semi-FOV of the maximum field angle of the optical imaging lens can satisfy the following conditions: TTL/Tan (Semi-FOV) <1.0 mm; and the effective focal length f2 of the second lens and the effective focal length f1 of the first lens can satisfy the following conditions: 3.5< f2/f1 is less than or equal to-3.0.

In some embodiments, the total effective focal length f of the optical imaging lens, the radius of curvature R11 of the object-side surface of the sixth lens, and the radius of curvature R12 of the image-side surface of the sixth lens may satisfy: -5.0< f/(R11-R12) < -2.0.

The optical imaging lens has the advantages that the seven-piece type lens framework is adopted, and the focal power, the surface type, the center thickness of each lens, the on-axis distance between each lens and the like of each lens are reasonably distributed, so that the optical imaging lens has at least one beneficial effect of large field angle, high imaging quality and the like.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

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

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

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

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

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

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

Detailed Description

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

It should be noted that in this specification, the expressions first, second, third, etc. are 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.

The optical imaging lens according to an exemplary embodiment of the present application may include, for example, seven lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in sequence from the object side to the image side along the optical axis. In the first to seventh lenses, any adjacent two lenses may have an air space therebetween.

In an exemplary embodiment, the first lens may have a negative power; the second lens may have a positive optical power; the third lens may have a positive optical power or a negative optical power; the fourth lens may have a positive optical power; the fifth lens may have a negative optical power; the sixth lens may have a positive optical power; the seventh lens may have a positive power or a negative power. The imaging quality of the optical imaging lens can be effectively improved by reasonably distributing the positive and negative focal powers of all the lenses of the optical imaging lens.

In an exemplary embodiment, the optical imaging lens may satisfy TTL/Tan (Semi-FOV) <1.0mm, where TTL is a distance on an optical axis from an object-side surface of the first lens to an imaging plane of the optical imaging lens, and Semi-FOV is half of a maximum field angle of the optical imaging lens. Specifically, TTL and Semi-FOV can satisfy: TTL/Tan (Semi-FOV) <0.90 mm.

In an exemplary embodiment, the optical imaging lens may satisfy-5.0 < f/(R11-R12) < -2.0, where f is an overall effective focal length of the optical imaging lens, R11 is a radius of curvature of an object-side surface of the sixth lens, and R12 is a radius of curvature of an image-side surface of the sixth lens. The optical imaging lens satisfies: the-5.0 < f/(R11-R12) < -2.0, the smooth transition of light can be maintained, the field angle of the optical imaging lens can be increased, and more scenes can be obtained when shooting by using the optical imaging lens. More specifically, f, R11, and R12 may satisfy: -3.0< f/(R11-R12) < -2.0.

In an exemplary embodiment, the optical imaging lens may satisfy 1.0< f7/f6<2.0, where f7 is an effective focal length of the seventh lens and f6 is an effective focal length of the sixth lens. And the focal power of the sixth lens and the seventh lens is reasonably distributed, so that the on-axis spherical aberration of the optical imaging lens is optimized. More specifically, f7 and f6 satisfy: f7/f6 is more than or equal to 1.50 and less than 2.0.

In an exemplary embodiment, the optical imaging lens may satisfy-3.5 < f2/f1 ≦ -3.0, where f2 is the effective focal length of the second lens and f1 is the effective focal length of the first lens. The optical power of the first lens and the second lens is reasonably distributed, which is beneficial to optimizing the vertical axis chromatic aberration of the optical imaging lens, and simultaneously, the sensitivity of the second lens can be reduced, and the shape of the first lens is optimized. More specifically, f2 and f1 satisfy: f2/f1 is more than-3.4 and less than or equal to-3.0.

In an exemplary embodiment, the optical imaging lens may satisfy-2.5 < f/(f4+ f5) < -2.0, where f is an overall effective focal length of the optical imaging lens, f4 is an effective focal length of the fourth lens, and f5 is an effective focal length of the fifth lens. The optical imaging lens satisfies: -2.5< f/(f4+ f5) < -2.0, which is effective in reducing decentering sensitivity of the fourth lens and the fifth lens.

In an exemplary embodiment, the optical imaging lens may satisfy-1.5 < f2/(R3+ R4) < -0.8, where f2 is an effective focal length of the second lens, 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. The optical imaging lens satisfies: -1.5< f2/(R3+ R4) < -0.8, which is advantageous for optimizing the shape of the second lens while being capable of correcting the on-axis chromatic aberration of the optical imaging lens. More specifically, f2, R3, and R4 may satisfy: -1.2< f2/(R3+ R4) < -0.8.

In an exemplary embodiment, the optical imaging lens may satisfy 4.5< f/CT2+ f/CT4<5.5, where f is a total effective focal length of the optical imaging lens, CT2 is a central thickness of the second lens on an optical axis, and CT4 is a central thickness of the fourth lens on the optical axis. The optical imaging lens satisfies: 4.5< f/CT2+ f/CT4<5.5, which helps to control the ghost image generated by the mutual reflection of the light rays between the second lens and the fourth lens, so as to reduce the intensity of the ghost image. More specifically, f, CT2, and CT4 may satisfy: 4.7< f/CT2+ f/CT4< 5.4.

In an exemplary embodiment, the optical imaging lens may satisfy 2.5< f/T45<3.5, where f is a total effective focal length of the optical imaging lens, and T45 is a separation distance of the fourth lens and the fifth lens on an optical axis. The optical imaging lens satisfies: 2.5< f/T45<3.5, which is helpful for making the optical imaging lens have the characteristic of miniaturization, thereby expanding the application range of the optical imaging lens. More specifically, f and T45 may satisfy: 2.9< f/T45< 3.4.

In an exemplary embodiment, the optical imaging lens may satisfy 1.5< f/CT7<2.5, where f is a total effective focal length of the optical imaging lens, and CT7 is a center thickness of the seventh lens on an optical axis. The optical imaging lens satisfies: 1.5< f/CT7<2.5, which can increase the strength of the seventh lens element, improve the process performance, and reduce the deformation degree of the lens element after the optical imaging lens assembly, thereby improving the assembly yield. More specifically, f and CT7 may satisfy: 1.8< f/CT7< 2.2.

In an exemplary embodiment, the optical imaging lens may satisfy 0< f1/R1<0.2, where f1 is an effective focal length of the first lens and R1 is a radius of curvature of an object side surface of the first lens. The shape of the first lens is reasonably controlled, so that the optical imaging lens has a larger field angle, the focal power of the first lens is reduced, and the sensitivity of the first lens is reduced. More specifically, f1 and R1 may satisfy: 0.1< f1/R1< 0.2.

In an exemplary embodiment, the optical imaging lens may satisfy-3.0 < R10/R9< -2.0, where R10 is a radius of curvature of an image-side surface of the fifth lens and R9 is a radius of curvature of an object-side surface of the fifth lens. The optical imaging lens satisfies: -3.0< R10/R9< -2.0, the effect of increasing the aperture of the optical imaging lens can be realized. More specifically, R10 and R9 may satisfy: -2.6< R10/R9< -2.2.

In an exemplary embodiment, the optical imaging lens may satisfy 11< f/(R5-R6) <15, where f is a total effective focal length of the optical imaging lens, 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. The optical imaging lens meets the requirement that the f/(R5-R6) <15, and is beneficial to reducing the optical distortion of the optical imaging lens, so that the imaging quality of the lens is improved. More specifically, f, R5, and R6 may satisfy: 11.0< f/(R5-R6) < 13.5.

In an exemplary embodiment, the optical imaging lens may satisfy 2.5< DT11/EPD <3.5, where DT11 is the effective radius of the object side of the first lens and EPD is the entrance pupil diameter of the optical imaging lens. The size of the first lens is reasonably controlled, so that the effect of enlarging the aperture of the optical imaging lens can be realized, and the light inlet quantity of the lens is improved. More specifically, DT11 and EPD may satisfy: 2.80< DT11/EPD < 3.40.

In an exemplary embodiment, the optical imaging lens may further include at least one diaphragm. The diaphragm may be disposed at an appropriate position as needed, for example, between the third lens and the fourth lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on the imaging surface.

The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, seven lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the optical imaging lens can be effectively reduced, the sensitivity of the optical imaging lens is reduced, and the machinability of the optical imaging lens group is improved, so that the optical imaging lens is more beneficial to production and processing and can be suitable for portable electronic products. The optical imaging lens according to the embodiment of the application can improve the imaging quality and has an ultra-wide angle.

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 seventh 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 an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspheric mirror surface. Optionally, each of the first, second, third, fourth, fifth, sixth, and seventh lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical imaging lens may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although seven lenses are exemplified in the embodiment, the optical imaging lens is not limited to include seven lenses. The optical imaging lens may also include other numbers of lenses, if desired.

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

Example 1

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

As shown in fig. 1, the optical imaging lens, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The optical imaging lens has an imaging surface S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

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

TABLE 1

In embodiment 1, the total effective focal length f of the optical imaging lens is 1.86mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 7.50mm, and the maximum field angle FOV is 166.3 °.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the seventh lens E7 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 a position of the aspheric surface at a height h in the optical axis directionWhen the device is set, the distance from the vertex of the aspheric surface is increased; 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 S14 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

TABLE 2

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

Example 2

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

As shown in fig. 3, the optical imaging lens, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

In embodiment 2, the total effective focal length f of the optical imaging lens is 1.86mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 7.50mm, and the maximum field angle FOV is 166.5 °.

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, and the focal length are all millimeters (mm). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 3

TABLE 4

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

Example 3

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

As shown in fig. 5, the optical imaging lens, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The optical imaging lens has an imaging surface S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In embodiment 3, the total effective focal length f of the optical imaging lens is 1.67mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 7.64mm, and the maximum field angle FOV is 175.2 °.

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, 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

S1

5.6760E-01

-7.1940E-02

2.3582E-02

-1.0408E-02

5.1748E-03

-3.2167E-03

1.8733E-03

S2

1.7070E-01

4.1102E-02

1.1124E-02

3.2917E-03

1.2445E-03

5.6372E-04

-4.0510E-04

S3

-1.6271E-01

1.6588E-02

1.4654E-03

-2.9851E-04

5.4201E-05

-6.8516E-05

5.6288E-05

S4

1.8885E-02

3.4651E-03

6.4614E-04

4.4072E-06

1.2393E-05

-4.1294E-05

1.1847E-05

S5

-4.8254E-03

-3.9875E-03

4.4311E-04

5.6608E-05

-8.0296E-06

2.0320E-05

-1.5126E-05

S6

-1.3109E-02

1.4366E-03

3.3642E-04

1.1894E-05

6.9963E-05

-4.7627E-05

1.1433E-05

S7

-1.2317E-02

2.7250E-03

-2.4574E-04

1.5282E-04

-5.2849E-05

4.0932E-05

-2.4636E-05

S8

-2.0130E-02

1.9488E-03

4.4259E-04

6.2661E-05

2.1683E-05

-1.7915E-05

7.2408E-06

S9

-2.2067E-01

2.1981E-02

-1.6394E-03

-4.7498E-04

-1.5519E-04

2.9897E-05

-6.2132E-05

S10

-2.0675E-01

6.4306E-02

-1.2888E-02

2.0011E-03

-4.0301E-04

2.0160E-04

-1.5166E-04

S11

5.1648E-01

-5.5068E-02

4.3205E-03

-1.6245E-03

-5.2242E-04

2.7498E-04

-1.5809E-04

S12

3.9611E-01

-5.2393E-03

-1.9276E-02

-9.4450E-03

8.3015E-04

-1.6833E-03

8.2749E-04

S13

-1.0637E+00

1.2144E-01

-3.7525E-02

1.1542E-02

3.5201E-03

-2.4430E-03

1.6802E-03

S14

-5.1252E-01

8.8843E-02

-5.0377E-02

1.5245E-02

5.3569E-03

-3.5854E-03

2.1997E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.0410E-03

5.9475E-04

-2.5662E-04

1.1655E-04

-5.0398E-05

1.0078E-05

-8.5179E-06

S2

5.7195E-04

-2.4295E-04

2.1345E-04

-1.9714E-04

5.4661E-05

-6.1770E-05

4.3205E-05

S3

-3.0588E-05

1.5201E-05

-1.4584E-05

4.7656E-06

-1.7883E-06

4.4972E-06

2.9882E-08

S4

-7.4032E-06

1.3814E-05

-2.4011E-06

7.1819E-06

-3.2972E-06

-3.8750E-07

-3.0815E-06

S5

5.3170E-06

-7.2815E-07

8.5864E-06

3.0500E-07

-2.4566E-07

-4.7009E-06

2.7745E-07

S6

-1.6123E-05

2.2270E-05

-4.5100E-06

8.5738E-06

-3.8066E-06

4.8637E-06

-6.9702E-06

S7

1.1266E-05

-1.2056E-05

1.3580E-05

-1.1798E-06

6.2463E-06

-6.6592E-06

1.3069E-06

S8

-2.7448E-06

7.8488E-06

-5.3033E-06

1.4117E-06

-1.1651E-06

8.4570E-07

-2.6248E-07

S9

2.2714E-05

-2.9039E-05

1.5647E-05

-7.0037E-06

1.2472E-05

-4.6866E-06

3.2565E-06

S10

7.8427E-05

-5.9001E-05

4.9631E-06

2.5047E-06

1.7011E-05

-1.1208E-05

9.0502E-06

S11

1.4467E-04

-2.6032E-05

-1.7635E-05

-5.6774E-06

1.5439E-05

-2.4906E-05

9.5308E-06

S12

-3.1238E-04

3.5720E-04

-1.1867E-04

7.8838E-05

-9.4449E-05

4.5278E-05

-2.9364E-05

S13

-1.3071E-03

3.3913E-04

-1.6889E-04

3.6427E-04

-8.5788E-05

3.5973E-05

-4.6514E-05

S14

-5.2111E-04

-1.7150E-04

1.1512E-04

2.1775E-04

-2.0702E-05

-1.1439E-04

-5.5904E-05

TABLE 6

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

In summary, examples 1 to 3 each satisfy the relationship shown in table 7.

Conditional expression (A) example	1	2	3
				TTL/Tan(Semi-FOV)(mm)	0.90	0.89	0.32
f/(R11-R12)	-2.56	-2.51	-2.18
				f7/f6	1.86	1.79	1.58
f2/f1	-3.04	-3.03	-3.31
				f/(f4+f5)	-2.33	-2.44	-2.18
f2/(R3+R4)	-1.04	-0.97	-0.89
				f/CT2+f/CT4	5.36	5.35	4.72
f/T45	3.33	3.32	2.99
				f/CT7	2.03	2.03	1.82
f1/R1	0.13	0.13	0.14
				R10/R9	-2.48	-2.40	-2.51
f/(R5-R6)	11.47	11.34	13.16
				DT11/EPD	2.95	2.95	3.27

TABLE 7

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera or 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 protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the scope of the present application. 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 negative optical power;

a second lens having a positive optical power;

a third lens;

a fourth lens having a positive optical power;

a fifth lens having a negative optical power;

a sixth lens having positive optical power;

a seventh lens;

wherein, a distance TTL between an object side surface of the first lens and an imaging surface of the optical imaging lens on the optical axis and a half Semi-FOV of a maximum field angle of the optical imaging lens satisfy:

TTL/Tan (Semi-FOV) <1.0 mm; and

the total effective focal length f of the optical imaging lens, the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy that:

-5.0<f/(R11-R12)<-2.0。

2. the optical imaging lens of claim 1, wherein the effective focal length f7 of the seventh lens and the effective focal length f6 of the sixth lens satisfy:

1.0<f7/f6<2.0。

3. the optical imaging lens of claim 1, wherein the effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy:

-3.5<f2/f1≤-3.0。

4. the optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy:

-2.5<f/(f4+f5)<-2.0。

5. the optical imaging lens of claim 1, wherein the effective focal length f2 of the second lens, 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:

-1.5<f2/(R3+R4)<-0.8。

6. the optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy:

4.5<f/CT2+f/CT4<5.5。

7. the optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens and the separation distance T45 between the fourth lens and the fifth lens on the optical axis satisfy:

2.5<f/T45<3.5。

8. the optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens and the center thickness CT7 of the seventh lens on the optical axis satisfy:

1.5<f/CT7<2.5。

9. the optical imaging lens of claim 1, wherein the effective focal length f1 of the first lens and the radius of curvature R1 of the object side of the first lens satisfy:

0<f1/R1<0.2。

10. the optical imaging lens of claim 1, wherein the radius of curvature R10 of the image-side surface of the fifth lens and the radius of curvature R9 of the object-side surface of the fifth lens satisfy:

-3.0<R10/R9<-2.0。

11. the optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens satisfy:

11<f/(R5-R6)<15。

12. the optical imaging lens of any one of claims 1 to 11, wherein an effective radius DT11 of the object side surface of the first lens and an entrance pupil diameter EPD of the optical imaging lens satisfy:

2.5<DT11/EPD<3.5。

13. 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 negative optical power;

a second lens having a positive optical power;

a third lens;

a fourth lens having a positive optical power;

a fifth lens having a negative optical power;

a sixth lens having positive optical power;

a seventh lens;

TTL/Tan (Semi-FOV) <1.0 mm; and

the effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy:

-3.5<f2/f1≤-3.0。

14. the optical imaging lens of claim 13, wherein the effective focal length f7 of the seventh lens and the effective focal length f6 of the sixth lens satisfy:

1.0<f7/f6<2.0。

15. the optical imaging lens of claim 14, wherein the total effective focal length f of the optical imaging lens, the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy:

-5.0<f/(R11-R12)<-2.0。

16. the optical imaging lens of claim 13, wherein the total effective focal length f of the optical imaging lens, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy:

-2.5<f/(f4+f5)<-2.0。

17. the optical imaging lens of claim 13, wherein the effective focal length f2 of the second lens, 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:

-1.5<f2/(R3+R4)<-0.8。

18. the optical imaging lens of claim 13 wherein the total effective focal length f of the optical imaging lens, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy:

4.5<f/CT2+f/CT4<5.5。

19. the optical imaging lens of claim 13, wherein the total effective focal length f of the optical imaging lens and the separation distance T45 between the fourth lens and the fifth lens on the optical axis satisfy:

2.5<f/T45<3.5。

20. the optical imaging lens of claim 13, wherein the total effective focal length f of the optical imaging lens and the center thickness CT7 of the seventh lens on the optical axis satisfy:

1.5<f/CT7<2.5。

21. the optical imaging lens of claim 13, wherein the effective focal length f1 of the first lens and the radius of curvature R1 of the object side of the first lens satisfy:

0<f1/R1<0.2。

22. the optical imaging lens of claim 13, wherein the radius of curvature R10 of the image-side surface of the fifth lens and the radius of curvature R9 of the object-side surface of the fifth lens satisfy:

-3.0<R10/R9<-2.0。

23. the optical imaging lens of claim 13, wherein the total effective focal length f of the optical imaging lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens satisfy:

11<f/(R5-R6)<15。

24. the optical imaging lens of any one of claims 13 to 23, wherein an effective radius DT11 of the object side surface of the first lens and an entrance pupil diameter EPD of the optical imaging lens satisfy:

2.5<DT11/EPD<3.5。