CN114047608B

CN114047608B - Optical imaging lens

Info

Publication number: CN114047608B
Application number: CN202111483533.6A
Authority: CN
Inventors: 杨泉锋; 周雨; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2023-07-04
Anticipated expiration: 2041-12-07
Also published as: CN114047608A

Abstract

The application provides an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the first lens has negative focal power, and the object side is a concave surface; the second lens has optical power, and the image side surface of the second lens is a convex surface; the third lens has positive optical power; the fourth lens has focal power, and the image side surface of the fourth lens is a convex surface; and the fifth, sixth and seventh lenses have optical power; the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the requirement that f/EPD is less than 1.9; an on-axis distance SAG21 between an intersection point of the object side surface of the second lens and the optical axis to an effective radius vertex of the object side surface of the second lens and an on-axis distance SAG11 between an intersection point of the object side surface of the first lens and the optical axis to an effective radius vertex of the object side surface of the first lens satisfy-2.0 < SAG21/SAG11 < -0.5.

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, various portable electronic products such as smartphones and tablet computers have become indispensable tools in life, and the portable electronic products have been rapidly developed, and as the portable electronic products are developed toward miniaturization and thinness, higher demands are also being made on optical imaging lenses mounted on the portable electronic products. While ensuring the imaging quality, the performance of the image sensor of the optical imaging lens needs to be improved and the size of the optical imaging lens needs to be reduced, so that the degree of freedom of the design of the optical imaging lens is smaller and smaller, and the design difficulty is increased. On the basis of ensuring miniaturization of the optical imaging lens, how to enable the optical imaging lens to have a large aperture and a larger image surface and good imaging quality is one of the problems to be solved in the field.

Disclosure of Invention

In some embodiments, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: -2.0 < R7/R8 < -0.5.

In some embodiments, the radius of curvature R2 of the image side of the first lens and the total effective focal length f of the optical imaging lens satisfy: 2.5 < |R2/f| < 3.5.

In some embodiments, the effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging lens satisfy: 1.0 < f4/f < 2.0.

In some embodiments, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: R7/R6 is more than 4.5 and less than 6.0.

In some embodiments, 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: -2.0 < (R3-R4)/(R3+R4) < -1.0.

In some embodiments, an on-axis distance SAG51 between an intersection of the object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens and an on-axis distance SAG42 between an intersection of the image side surface of the fourth lens and the optical axis and an effective radius vertex of the image side surface of the fourth lens satisfy: 2.5 < (SAG51+SAG42)/(SAG 51-SAG 42) < 3.5.

In some embodiments, an edge thickness ET7 of the seventh lens in a direction parallel to the optical axis and a center thickness CT7 of the seventh lens satisfy: ET7/CT7 is less than 1.5 and less than 4.5.

In some embodiments, a sum Σat of a separation distance T45 between the fourth lens and the fifth lens along the optical axis and an air separation distance along the optical axis between any adjacent two lenses of the first lens to the seventh lens satisfies: 0 < T45/ΣAT < 0.5.

In some embodiments, an on-axis distance SAG71 between an intersection of the object side surface of the seventh lens and the optical axis and an effective radius vertex of the object side surface of the seventh lens and an on-axis distance SAG72 between an intersection of the image side surface of the seventh lens and the optical axis and an effective radius vertex of the image side surface of the seventh lens satisfy: 0.5 < (SAG71+SAG72)/(SAG 71-SAG 72) < 3.0.

In some embodiments, the maximum half field angle Semi-FOV of the optical imaging lens satisfies: the Semi-FOV is more than or equal to 40.0 degrees.

In some embodiments, the distance TTL from the object side surface of the first lens to the imaging surface along the optical axis and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.7.

The application also provides an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the first lens has negative focal power, and the object side is a concave surface; the second lens has optical power, and the image side surface of the second lens is a convex surface; the third lens has positive optical power; the fourth lens has focal power, and the image side surface of the fourth lens is a convex surface; and the fifth, sixth and seventh lenses have optical power; the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the requirement that f/EPD is less than 1.9; the curvature radius R2 of the image side surface of the first lens and the total effective focal length f of the optical imaging lens meet the requirement that 2.5 < |R2/f| < 3.5.

The seven-piece lens architecture is adopted, and at least one beneficial effect of miniaturization, large aperture, large image surface, good imaging quality and the like is achieved when the optical imaging lens meets imaging requirements by reasonably distributing focal power, surface type, center thickness of each lens, axial spacing between each lens 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, taken in conjunction with the accompanying drawings. In the drawings:

Fig. 1 shows a schematic configuration diagram of an optical imaging lens according to embodiment 1 of the present application;

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

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

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

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

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

fig. 7 shows a schematic structural diagram of an optical imaging lens according to embodiment 4 of the present application;

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

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

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

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 these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

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

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

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

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "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, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

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

The optical imaging lens according to the exemplary embodiment of the present application may include, for example, seven lenses having optical power, 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 lens to the seventh lens, any adjacent two lenses may have an air space therebetween.

In an exemplary embodiment, the optical imaging lens may further include at least one diaphragm. The diaphragm may be provided at an appropriate position as required, for example, between the second lens and the third lens.

In an exemplary embodiment, the first lens may have negative optical power; the second lens may have positive or negative optical power; the third lens may have positive optical power; the fourth lens may have positive or negative optical power; the fifth lens may have positive or negative optical power; the sixth lens may have positive or negative optical power; the seventh lens may have positive or negative optical power. The imaging quality can be effectively improved by reasonably distributing the positive and negative focal power of each lens of the optical imaging lens. In addition, the first lens has negative focal power, and the third lens has positive focal power, so that spherical aberration and chromatic aberration generated by the lens group can be effectively balanced, the imaging quality is improved, and a clear image can be displayed on the photosensitive element.

In an exemplary embodiment, the object side surface of the first lens element may be concave, the image side surface of the second lens element may be convex, and the image side surface of the fourth lens element may be convex.

In an exemplary embodiment, the optical imaging lens may satisfy f/EPD < 1.9, 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 optical imaging lens satisfies f/EPD < 1.9, is favorable for effectively improving the energy density of an image plane and improves the signal-to-noise ratio of an output signal of an image sensor.

In an exemplary embodiment, the optical imaging lens may satisfy-2.0 < SAG21/SAG11 < -0.5, wherein SAG21 is an on-axis distance between an intersection point of the object side surface of the second lens and the optical axis to an effective radius vertex of the object side surface of the second lens, and SAG11 is an on-axis distance between an intersection point of the object side surface of the first lens and the optical axis to an effective radius vertex of the object side surface of the first lens. The optical imaging lens satisfies-2.0 < SAG21/SAG11 < -0.5, is beneficial to smaller incidence angle and higher relative illuminance when the principal ray of the optical imaging lens is incident on an image plane, and is beneficial to better processability of the second lens.

In an exemplary embodiment, the optical imaging lens may satisfy-2.0 < R7/R8 < -0.5, where R7 is a radius of curvature of an object-side surface of the fourth lens and R8 is a radius of curvature of an image-side surface of the fourth lens. The optical imaging lens satisfies R7/R8 < -0.5 which is less than-2.0, is favorable for reducing the sensitivity of the optical imaging lens, and ensures that the fourth lens has good manufacturability.

In an exemplary embodiment, the optical imaging lens may satisfy 2.5 < |r2/f| < 3.5, where R2 is a radius of curvature of an image side surface of the first lens and f is a total effective focal length of the optical imaging lens. The optical imaging lens meets the requirement that R2/f is less than 3.5, so that the field curvature and distortion of the optical imaging lens group can be improved, and the processing difficulty of the first lens is controlled.

In an exemplary embodiment, the optical imaging lens may satisfy 1.0 < f4/f < 2.0, where f4 is an effective focal length of the fourth lens and f is a total effective focal length of the optical imaging lens. The optical imaging lens satisfies the conditions that f4/f is smaller than 1.0 and smaller than 2.0, is favorable for controlling the ghost image formed by total reflection of the fourth lens, and can reduce the sensitivity of the fourth lens. More specifically, f4 and f may satisfy: 1.2 < f4/f < 1.8.

In an exemplary embodiment, the optical imaging lens may satisfy 4.5 < R7/R6 < 6.0, where R7 is a radius of curvature of an object side surface of the fourth lens element and R6 is a radius of curvature of an image side surface of the third lens element. The optical imaging lens satisfies R7/R6 being more than 4.5 and less than 6.0, is favorable for reducing deflection of light rays, reduces sensitivity of the optical imaging lens, and ensures that the third lens has good manufacturability.

In an exemplary embodiment, the optical imaging lens may satisfy-2.0 < (r3—r4)/(r3+r4) < -1.0, where R3 is a radius of curvature of the object side of the second lens and R4 is a radius of curvature of the image side of the second lens. The optical imaging lens satisfies-2.0 < (R3-R4)/(R3+R 4) < -1.0, is favorable for controlling the ghost image formed by total reflection between the second lens and the first lens, is favorable for correcting chromatic aberration and ensures good imaging quality of an optical system. More specifically, R3 and-R4 may satisfy-1.8 < (R3-R4)/(R3+R4) < -1.4.

In an exemplary embodiment, the optical imaging lens may satisfy 2.5 < (SAG51+SAG42)/(SAG 51-SAG 42) < 3.5, wherein SAG51 is an on-axis distance between an intersection point of the object side surface of the fifth lens and the optical axis to an effective radius vertex of the object side surface of the fifth lens, and SAG42 is an on-axis distance between an intersection point of the image side surface of the fourth lens and the optical axis to an effective radius vertex of the image side surface of the fourth lens. The optical imaging lens satisfies that (SAG51+SAG42)/(SAG 51-SAG 42) < 3.5, is favorable for avoiding the fourth lens and the fifth lens from being excessively bent, reduces the processing difficulty, and simultaneously ensures that the assembly of the optical imaging lens has higher stability. More specifically, SAG51 and SAG42 may satisfy 2.8 < (SAG51+SAG42)/(SAG 51-SAG 42) < 3.3.

In an exemplary embodiment, the optical imaging lens may satisfy 1.5 < ET7/CT7 < 4.5, wherein ET7 is an edge thickness of the seventh lens in a direction parallel to the optical axis, and CT7 is a center thickness of the seventh lens. The optical imaging lens satisfies the conditions of 1.5 < ET7/CT7 < 4.5, is favorable for reducing the processing difficulty of the optical lens, and can reduce the angle between the main light ray and the optical axis when entering the image plane and improve the relative illuminance of the image plane. More specifically, ET7 and CT7 may satisfy 1.9 < ET7/CT7 < 4.2.

In an exemplary embodiment, the optical imaging lens may satisfy 0 < T45/Σat < 0.5, where T45 is a distance between the fourth lens and the fifth lens along the optical axis, Σat is a sum of air distances between any adjacent two lenses of the first lens to the seventh lens along the optical axis. The optical imaging lens satisfies 0 < T45/ΣAT < 0.5, is favorable for slowing down the light deflection degree and reducing the sensitivity of the optical imaging lens. More specifically, T45 and ΣAT may satisfy 0.3 < T45/ΣAT < 0.5.

In an exemplary embodiment, the optical imaging lens may satisfy 0.5 < (SAG71+SAG72)/(SAG 71-SAG 72) < 3.0, wherein SAG71 is an on-axis distance between an intersection point of the object side surface of the seventh lens and the optical axis to an effective radius vertex of the object side surface of the seventh lens, and SAG72 is an on-axis distance between an intersection point of the image side surface of the seventh lens and the optical axis to an effective radius vertex of the image side surface of the seventh lens. The optical imaging lens satisfies that (SAG71+SAG72)/(SAG 71-SAG 72) < 3.0, is favorable for avoiding the excessive bending of the seventh lens, reduces the processing difficulty, and simultaneously ensures that the assembly of the optical imaging lens has higher stability.

In an exemplary embodiment, the optical imaging lens may satisfy a Semi-FOV of 40.0 or more, where Semi-FOV is the maximum half field angle of the optical imaging lens. The optical imaging lens meets the requirement that the Semi-FOV is more than or equal to 40.0 degrees, and is favorable for the optical imaging lens to still have a better imaging range under a certain volume. More specifically, 40.0.ltoreq.semi-FOV < 45.0.

In an exemplary embodiment, the optical imaging lens may satisfy TTL/ImgH < 1.7, where TTL is a distance along the optical axis from the object side surface of the first lens to the imaging surface, and ImgH is half of a diagonal length of the effective pixel region on the imaging surface. The optical imaging lens meets TTL/ImgH smaller than 1.7, is beneficial to realizing larger imaging height and shorter optical total length, is beneficial to realizing miniaturization of the optical imaging lens, and is beneficial to improving imaging quality.

In an exemplary embodiment, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.

The optical imaging lens according to the above-described embodiments of the present application may employ a plurality of lenses, such as seven lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like of each lens, the volume of the optical imaging lens can be effectively reduced, the sensitivity of the optical imaging lens can be reduced, and the processability of the optical imaging lens can be improved, so that the optical imaging lens is more beneficial to production and processing and is applicable to portable electronic products. The optical imaging lens according to the embodiment of the application has the characteristics of meeting imaging requirements and achieving a large aperture and a large image surface.

In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., 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. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving 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 aspherical mirror surface. Optionally, the object side surface and the 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 are aspherical mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging lens may be varied to achieve the various results and advantages described in the specification without departing from the technical solutions claimed herein. For example, although seven lenses are described as an example 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 the optical imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

Example 1

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

As shown in fig. 1, the optical imaging lens sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, 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 refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from an object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

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

TABLE 1

In embodiment 1, the total effective focal length f of the optical imaging lens is 4.10mm, the distance TTL from the object side surface of the first lens to the imaging surface along the optical axis is 6.22mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface is 3.99mm, and the maximum half field angle Semi-FOV of the optical imaging lens is 42.8 °.

In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 2 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1 to S14 in example 1 ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ 、A ₂₀ 、A ₂₂ 、A ₂₄ 、A ₂₆ 、A ₂₈ And A ₃₀ 。

TABLE 2

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

Example 2

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

As shown in fig. 3, the optical imaging lens sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, 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 refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from an object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In embodiment 2, the total effective focal length f of the optical imaging lens is 4.30mm, the distance TTL from the object side surface of the first lens to the imaging surface along the optical axis is 6.30mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface is 3.99mm, and the maximum half field angle Semi-FOV of the optical imaging lens is 41.5 °.

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

TABLE 3 Table 3

Face number

A4

A6

A8

A10

A12

A14

A16

S1

7.9059E-01

-1.7287E-02

1.6604E-02

1.7956E-03

-5.0660E-04

-1.5826E-04

-2.9014E-04

S2

7.0217E-02

2.2223E-02

-4.8180E-03

4.8548E-03

-7.0323E-04

4.6903E-04

-1.0055E-04

S3

-2.6793E-01

-1.7886E-02

-1.1840E-02

1.9895E-05

-1.8146E-03

-7.3975E-04

-4.8966E-04

S4

-1.2356E-02

-1.7913E-02

-6.8549E-04

-3.3890E-04

-1.7404E-04

-2.1265E-04

-9.2903E-05

S5

-1.6233E-01

-3.8679E-03

-1.7638E-03

4.2859E-05

-3.3633E-05

-1.0253E-06

-5.6563E-06

S6

-1.5734E-01

-4.1975E-03

-1.8765E-03

3.5824E-05

-2.9981E-05

-4.0068E-07

-4.4935E-06

S7

-9.7576E-03

-1.7367E-03

-2.0307E-04

-1.8369E-05

1.1562E-06

-1.8516E-06

1.1683E-06

S8

-5.3400E-02

-7.4968E-03

-5.6062E-04

-7.4396E-05

-8.4162E-08

-9.8465E-06

4.2641E-06

S9

4.9399E-01

-9.3487E-02

1.8576E-02

-4.6962E-03

1.2151E-03

-2.9080E-04

1.8045E-05

S10

7.9958E-01

-1.2266E-01

3.4530E-02

-9.3827E-03

2.4496E-03

-8.4064E-04

1.7479E-04

S11

-8.6554E-01

1.8358E-02

-5.4586E-03

1.0011E-02

-3.2287E-04

5.6638E-04

-4.4351E-04

S12

-1.9924E-01

1.9329E-02

-5.6021E-02

1.1565E-02

2.3842E-03

-1.3511E-03

-3.0194E-03

S13

2.2369E+00

1.8754E-02

-1.2131E-01

6.3452E-02

-9.5551E-02

5.3215E-02

-7.7744E-03

S14

-2.1288E+00

2.5326E-01

-1.2320E-01

5.5265E-02

-3.2656E-02

6.6064E-05

-1.2486E-02

Face number

A18

A20

A22

A24

A26

A28

A30

S1

-5.1548E-05

5.4217E-05

8.4945E-05

5.9159E-05

2.2022E-05

-3.6863E-06

-5.0392E-06

S2

4.8061E-05

-3.0425E-05

-5.2131E-06

-2.1984E-05

-1.2993E-05

-8.3842E-06

-2.8549E-06

S3

9.5363E-06

1.4783E-04

2.0780E-04

1.5368E-04

9.9896E-05

4.4221E-05

1.6015E-05

S4

-3.6646E-05

2.9427E-06

1.4019E-05

1.7915E-05

9.9804E-06

6.3354E-06

2.1333E-07

S5

0.0000E+00

S6

0.0000E+00

S7

0.0000E+00

S8

0.0000E+00

S9

1.0565E-06

1.3313E-07

5.2493E-08

0.0000E+00

S10

4.9268E-07

-2.8304E-08

0.0000E+00

S11

-6.9852E-06

0.0000E+00

S12

-2.9459E-04

-4.2422E-05

-6.1678E-06

0.0000E+00

S13

-2.8421E-05

0.0000E+00

S14

-1.4423E-04

-2.5692E-06

0.0000E+00

TABLE 4 Table 4

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

Example 3

An optical imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. 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 sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

In embodiment 3, the total effective focal length f of the optical imaging lens is 4.41mm, the distance TTL from the object side surface of the first lens to the imaging surface along the optical axis is 6.50mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface is 3.99mm, and the maximum half field angle Semi-FOV of the optical imaging lens is 40.4 °.

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

TABLE 5

Face number

A4

A6

A8

A10

A12

A14

A16

S1

7.4787E-01

-4.1246E-02

1.1437E-02

3.7938E-04

3.5856E-05

-2.5123E-04

-2.2932E-04

S2

2.1233E-02

2.9394E-02

-8.6586E-03

3.7086E-03

-5.7893E-04

5.0637E-04

-9.0626E-06

S3

-2.5827E-01

-9.5262E-03

-1.4109E-02

-6.2594E-04

-8.8646E-04

2.1528E-04

1.8446E-05

S4

4.7584E-02

-1.8560E-02

-1.2459E-03

-7.4648E-04

1.6119E-04

3.0152E-05

3.9517E-05

S5

-2.8768E-01

-1.9795E-02

-5.1961E-03

-7.0247E-04

-2.2658E-04

-8.7847E-05

-3.4938E-05

S6

-2.6124E-01

-1.3430E-02

-4.0381E-03

-1.3172E-04

-1.3419E-04

-3.2239E-05

-2.4380E-05

S7

-3.6365E-02

-9.7166E-03

-2.2345E-04

4.5862E-04

3.0025E-04

1.0197E-04

3.4461E-05

S8

-1.0105E-01

-1.6760E-02

-1.4762E-03

-2.5515E-04

1.3301E-05

4.4365E-06

1.4247E-05

S9

5.0523E-01

-1.0112E-01

2.0570E-02

-6.3294E-03

1.6107E-03

-3.5007E-04

-6.1387E-06

S10

8.7316E-01

-1.1944E-01

3.3363E-02

-1.2422E-02

3.9890E-03

-1.0372E-03

1.9719E-04

S11

-6.5306E-01

3.9607E-02

-3.1024E-03

6.0936E-03

-1.3454E-03

5.6416E-04

-2.4185E-04

S12

4.0109E-01

-7.6353E-02

-1.1544E-02

7.1801E-03

-1.3705E-03

1.3334E-03

-3.0068E-04

S13

1.0356E+00

1.1734E-01

-8.5288E-02

4.1474E-02

-8.5694E-03

1.0407E-03

-1.5132E-06

S14

-1.7396E+00

2.9642E-01

-1.1598E-01

3.5938E-02

-1.3018E-02

4.9331E-03

-1.1269E-03

Face number

A18

A20

A22

A24

A26

A28

A30

S1

-8.7679E-05

-6.9530E-07

3.2303E-06

1.4349E-05

3.1048E-05

2.3607E-05

9.6985E-06

S2

6.3930E-05

-2.4025E-05

6.3313E-07

-7.7446E-06

-4.9002E-07

-2.1355E-06

3.7234E-09

S3

7.8612E-05

-1.4843E-05

-1.0938E-05

-2.3344E-05

-6.2941E-06

-2.9539E-06

5.7036E-06

S4

-8.8046E-06

-1.2524E-05

-1.2137E-05

-2.1167E-06

-6.2166E-07

2.8641E-06

4.2100E-07

S5

-6.8028E-06

-1.5969E-06

0.0000E+00

S6

-5.1583E-06

0.0000E+00

S7

7.3957E-08

0.0000E+00

S8

2.9731E-07

0.0000E+00

S9

1.5749E-05

4.9486E-06

1.0219E-06

0.0000E+00

S10

-9.7710E-07

-8.3500E-08

0.0000E+00

S11

-1.6585E-07

0.0000E+00

S12

-9.8095E-06

-4.9733E-07

-2.6313E-08

0.0000E+00

S13

8.9121E-06

0.0000E+00

S14

-6.5267E-06

-1.1964E-07

0.0000E+00

TABLE 6

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

Example 4

An optical imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. 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 sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, 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 refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from an object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In embodiment 4, the total effective focal length f of the optical imaging lens is 4.30mm, the distance TTL from the object side surface of the first lens to the imaging surface along the optical axis is 6.28mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface is 3.99mm, and the maximum half field angle Semi-FOV of the optical imaging lens is 40.4 °.

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

TABLE 7

TABLE 8

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

Example 5

An optical imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. 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 sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

In embodiment 5, the total effective focal length f of the optical imaging lens is 4.48mm, the distance TTL from the object side surface of the first lens to the imaging surface along the optical axis is 6.43mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface is 3.99mm, and the maximum half field angle Semi-FOV of the optical imaging lens is 40.1 °.

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

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TABLE 9

Table 10

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

In summary, examples 1 to 5 satisfy the relationships shown in table 11, respectively.

Condition/example	1	2	3	4	5
						R7/R8	-1.82	-1.33	-1.58	-0.78	-1.69
R4/R5	-5.73	-5.34	-5.67	-6.00	-5.72
						\|R2/f\|	3.15	3.28	2.83	2.82	2.99
f4/f	1.46	1.32	1.33	1.77	1.28
						R7/R6	5.82	4.67	5.42	4.88	5.49
SAG21/SAG11	-1.65	-0.85	-1.62	-1.15	-1.90
						(R3-R4)/(R3+R4)	-1.47	-1.73	-1.55	-1.61	-1.52
(SAG51+SAG42)/(SAG51-SAG42)	3.18	2.88	3.23	2.93	2.95
						ET7/CT7	2.38	2.99	2.78	4.17	1.91
T45/∑AT	0.40	0.40	0.39	0.39	0.43
						(SAG71+SAG72)/(SAG71-SAG72)	1.90	1.78	1.66	0.53	2.68
TTL/ImgH	1.56	1.58	1.63	1.57	1.61
						f/EPD	1.83	1.83	1.83	1.83	1.83

TABLE 11

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

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It should be understood by those skilled in the art that the scope of protection referred to in this application is not limited to the specific combination of the above technical features, but also encompasses other technical solutions formed by any combination of the above technical features or their equivalents without departing from the spirit of the application. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

1. The optical imaging lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from an object side to an image side along an optical axis, wherein,

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

the second lens has positive focal power, and the image side surface of the second lens is a convex surface;

the third lens has positive optical power;

the fourth lens has positive focal power, and the image side surface of the fourth lens is a convex surface;

the fifth lens has optical power;

the sixth lens has positive optical power; and

the seventh lens has negative focal power;

the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the requirement that f/EPD is less than 1.9;

an on-axis distance SAG21 between an intersection point of the object side surface of the second lens and the optical axis and an effective radius vertex of the object side surface of the second lens and an on-axis distance SAG11 between an intersection point of the object side surface of the first lens and the optical axis and an effective radius vertex of the object side surface of the first lens satisfy-2.0 < SAG21/SAG11 < -0.5;

the distance TTL from the object side surface of the first lens to the imaging surface along the optical axis and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.7; and

the number of lenses having optical power in the optical imaging lens is seven.

2. The optical imaging lens of claim 1, wherein a radius of curvature R7 of an object side surface of the fourth lens and a radius of curvature R8 of an image side surface of the fourth lens satisfy:

-2.0＜R7/R8＜-0.5。

3. The optical imaging lens of claim 1, wherein a radius of curvature R2 of an image side surface of the first lens and a total effective focal length f of the optical imaging lens satisfy:

2.5＜|R2/f|＜3.5。

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

1.0＜f4/f＜2.0。

5. the optical imaging lens of claim 1, wherein a radius of curvature R7 of an object side surface of the fourth lens and a radius of curvature R6 of an image side surface of the third lens satisfy:

4.5＜R7/R6＜6.0。

6. the optical imaging lens of claim 1, wherein a radius of curvature R3 of an object side surface of the second lens and a radius of curvature R4 of an image side surface of the second lens satisfy:

-2.0＜(R3-R4)/(R3+R4)＜-1.0。

7. the optical imaging lens according to claim 1, wherein an on-axis distance SAG51 between an intersection of the object side surface of the fifth lens and the optical axis to an effective radius vertex of the object side surface of the fifth lens and an on-axis distance SAG42 between an intersection of the image side surface of the fourth lens and the optical axis to an effective radius vertex of the image side surface of the fourth lens satisfy:

2.5＜(SAG51+SAG42)/(SAG51-SAG42)＜3.5。

8. The optical imaging lens according to claim 1, wherein an edge thickness ET7 of the seventh lens in a direction parallel to the optical axis and a center thickness CT7 of the seventh lens satisfy:

1.5＜ET7/CT7＜4.5。

9. the optical imaging lens according to claim 1, wherein a sum Σat of a separation distance T45 of the fourth lens and the fifth lens along the optical axis and an air separation distance along the optical axis between any adjacent two lenses of the first lens to the seventh lens satisfies:

0＜T45/∑AT＜0.5。

10. the optical imaging lens according to claim 1, wherein an on-axis distance SAG71 between an intersection of the object side surface of the seventh lens and the optical axis to an effective radius vertex of the object side surface of the seventh lens and an on-axis distance SAG72 between an intersection of the image side surface of the seventh lens and the optical axis to an effective radius vertex of the image side surface of the seventh lens satisfy:

0.5＜(SAG71+SAG72)/(SAG71-SAG72)＜3.0。

11. the optical imaging lens of claim 1, wherein a maximum half field angle Semi-FOV of the optical imaging lens satisfies:

Semi-FOV≥40.0°。

12. the optical imaging lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from an object side to an image side along an optical axis, wherein,

the third lens has positive optical power;

the fifth lens has optical power;

the sixth lens has positive optical power; and

the seventh lens has negative focal power;

the curvature radius R2 of the image side surface of the first lens and the total effective focal length f of the optical imaging lens meet 2.5 < |R2/f| < 3.5; and

the number of lenses having optical power in the optical imaging lens is seven.

13. The optical imaging lens of claim 12, wherein a radius of curvature R7 of an object-side surface of the fourth lens and a radius of curvature R8 of an image-side surface of the fourth lens satisfy:

-2.0＜R7/R8＜-0.5。

14. the optical imaging lens of claim 12, wherein an effective focal length f4 of the fourth lens and a total effective focal length f of the optical imaging lens satisfy:

1.0＜f4/f＜2.0。

15. The optical imaging lens of claim 12, wherein a radius of curvature R7 of an object side surface of the fourth lens and a radius of curvature R6 of an image side surface of the third lens satisfy:

4.5＜R7/R6＜6.0。

16. the optical imaging lens of claim 12, wherein a radius of curvature R3 of an object side surface of the second lens and a radius of curvature R4 of an image side surface of the second lens satisfy:

-2.0＜(R3-R4)/(R3+R4)＜-1.0。

17. the optical imaging lens of claim 12, wherein an on-axis distance SAG51 between an intersection of the object side surface of the fifth lens and the optical axis to an effective radius vertex of the object side surface of the fifth lens and an on-axis distance SAG42 between an intersection of the image side surface of the fourth lens and the optical axis to an effective radius vertex of the image side surface of the fourth lens satisfy:

2.5＜(SAG51+SAG42)/(SAG51-SAG42)＜3.5。

18. the optical imaging lens according to claim 12, wherein an edge thickness ET7 of the seventh lens in a direction parallel to the optical axis and a center thickness CT7 of the seventh lens satisfy:

1.5＜ET7/CT7＜4.5。

19. the optical imaging lens according to claim 12, wherein a sum Σat of a separation distance T45 of the fourth lens and the fifth lens along the optical axis and an air separation distance along the optical axis between any adjacent two lenses of the first lens to the seventh lens satisfies:

0＜T45/∑AT＜0.5。

20. The optical imaging lens of claim 12, wherein an on-axis distance SAG71 between an intersection of the object side surface of the seventh lens and the optical axis to an effective radius vertex of the object side surface of the seventh lens and an on-axis distance SAG72 between an intersection of the image side surface of the seventh lens and the optical axis to an effective radius vertex of the image side surface of the seventh lens satisfy:

0.5＜(SAG71+SAG72)/(SAG71-SAG72)＜3.0。

21. the optical imaging lens of claim 12, wherein a maximum half field angle Semi-FOV of the optical imaging lens satisfies:

Semi-FOV≥40.0°。