CN114047608A

CN114047608A - Optical imaging lens

Info

Publication number: CN114047608A
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: 2022-02-15
Anticipated expiration: 2041-12-07
Also published as: CN114047608B

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 surface of the first lens is a concave surface; the second lens has 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 focal power, and the image side surface of the fourth lens is a convex surface; and the fifth lens, the sixth lens and the seventh lens have optical powers; wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy f/EPD < 1.9; an on-axis distance SAG21 between an intersection point of an object-side surface of the second lens and the optical axis to an effective radius vertex of an object-side surface of the second lens and an on-axis distance SAG11 between an intersection point of an object-side surface of the first lens and the optical axis to an effective radius vertex of an 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 smart phones, tablet computers, and the like 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 lightness, higher requirements are also 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 the miniaturization of the optical imaging lens, how to make the optical imaging lens have a large aperture and a large image plane and have good imaging quality is one of the problems to be solved urgently in the field.

Disclosure of Invention

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 surface of the first lens is a concave surface; the second lens has 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 focal power, and the image side surface of the fourth lens is a convex surface; and the fifth lens, the sixth lens and the seventh lens have optical powers; wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy f/EPD < 1.9; an on-axis distance SAG21 between an intersection point of an object-side surface of the second lens and the optical axis to an effective radius vertex of an object-side surface of the second lens and an on-axis distance SAG11 between an intersection point of an object-side surface of the first lens and the optical axis to an effective radius vertex of an object-side surface of the first lens satisfy-2.0 < SAG21/SAG11 < -0.5.

In some embodiments, 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.

In some embodiments, the radius of curvature R2 of the image-side surface 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: f4/f is more than 1.0 and less than 2.0.

In some embodiments, a radius of curvature R7 of the object-side surface of the fourth lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 4.5 < R7/R6 < 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 an 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 an image-side surface of the fourth lens and the optical axis to an effective radius vertex of an image-side surface of the fourth lens satisfy: 2.5 < (SAG51+ SAG42)/(SAG51-SAG42) < 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: 1.5 < ET7/CT7 < 4.5.

In some embodiments, a distance T45 between the fourth lens and the fifth lens along the optical axis and a sum Σ AT of distances between any adjacent two lenses of the first lens to the seventh lens along the air on the optical axis satisfy: 0 < T45/∑ AT < 0.5.

In some embodiments, an on-axis distance SAG71 between an intersection of an 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 an 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.

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

The present application further provides an optical imaging lens, which sequentially includes, from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein the first lens element has a negative focal power, and an object-side surface of the first lens element is a concave surface; the second lens has 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 focal power, and the image side surface of the fourth lens is a convex surface; and the fifth lens, the sixth lens and the seventh lens have optical powers; wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy f/EPD < 1.9; 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 2.5 < | R2/f | < 3.5.

The optical imaging lens adopts a seven-piece lens framework, and at least one beneficial effect of miniaturization, large aperture, large image plane, good imaging quality and the like is realized while the imaging requirement is met by reasonably distributing the focal power of each lens, the surface type, the central thickness of each lens, the on-axis distance 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 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;

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

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

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

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

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

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 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 second lens and the third lens.

In an exemplary embodiment, the first lens may have a negative power; the second lens may have a positive or negative optical power; the third lens may have a positive optical power; the fourth lens may have a positive power or a negative power; the fifth lens may have a positive power or a negative power; the sixth lens may have a positive optical power or a negative optical power; the seventh lens may have a positive power or a negative power. By reasonably distributing the positive and negative focal powers of all the lenses of the optical imaging lens, the imaging quality can be effectively improved. In addition, the first lens has negative focal power, and the third lens has positive focal power, so that the 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 presented on the photosensitive element.

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

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 meets the condition that f/EPD is less than 1.9, thereby being beneficial to effectively improving the image surface energy density and improving the signal-to-noise ratio of the output signal of the image sensor.

In an exemplary embodiment, the optical imaging lens may satisfy-2.0 < SAG21/SAG11 < -0.5, where SAG21 is an on-axis distance between an intersection of an 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 of an 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 meets the requirements that-2.0 < SAG21/SAG11 < 0.5, the optical imaging lens is favorable for having a smaller incident angle and higher relative illumination when the chief ray of the optical imaging lens is incident on an image surface, and the second lens is favorable for having better processability.

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 meets the requirements that R7/R8 is more than-2.0 and less than-0.5, the sensitivity of the optical imaging lens is favorably reduced, and meanwhile, 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, which is favorable for improving the curvature of field and distortion of the optical imaging lens group and controlling the processing difficulty of the first lens.

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 meets the requirement that f4/f is more than 1.0 and less than 2.0, is favorable for controlling a 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: f4/f is more than 1.2 and less than 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 and R6 is a radius of curvature of an image-side surface of the third lens. The optical imaging lens meets the requirements that R7/R6 is more than 4.5 and less than 6.0, light deflection is reduced, the sensitivity of the optical imaging lens is reduced, and meanwhile, the third lens is guaranteed to have 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 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 meets the condition that-2.0 < (R3-R4)/(R3+ R4) < -1.0, is favorable for controlling a ghost image formed by total reflection between the second lens and the first lens, and is favorable for correcting chromatic aberration and ensuring 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)/(SAG51-SAG42) < 3.5, where SAG51 is an on-axis distance between an intersection of an 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 of an 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 meets the requirement that (SAG51+ SAG42)/(SAG51-SAG42) < 3.5, the fourth lens and the fifth lens are prevented from being bent too much, the processing difficulty is reduced, and meanwhile the assembly of the optical imaging lens has higher stability. More specifically, SAG51 and SAG42 may satisfy 2.8 < (SAG51+ SAG42)/(SAG51-SAG42) < 3.3.

In an exemplary embodiment, the optical imaging lens may satisfy 1.5 < ET7/CT7 < 4.5, where 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 meets the requirement that ET7/CT7 is more than 1.5 and less than 4.5, the processing difficulty of the optical lens is favorably reduced, the angle between a chief ray and an optical axis when the chief ray is incident on an image surface can be reduced, and the relative illumination of the image surface is improved. 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/∑ AT < 0.5, where T45 is a separation distance of the fourth lens and the fifth lens along the optical axis, and Σ AT is a sum of air separation distances along the optical axis between any adjacent two lenses of the first lens to the seventh lens. The optical imaging lens meets the requirements that T45 and Sigma AT are more than 0 and less than 0.5, and is beneficial to reducing the light deflection degree and reducing the sensitivity of the optical imaging lens. More specifically, T45 and Σ AT can satisfy 0.3 < T45/∑ AT < 0.5.

In an exemplary embodiment, the optical imaging lens may satisfy 0.5 < (SAG71+ SAG72)/(SAG71-SAG72) < 3.0, where SAG71 is an on-axis distance between an intersection of an 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 of an 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 meets the condition that (SAG71+ SAG72)/(SAG71-SAG72) < 3.0 & lt 0.5, which is beneficial to avoiding the seventh lens from being too bent, reducing the processing difficulty and simultaneously ensuring that the assembly of the optical imaging lens has higher stability.

In an exemplary embodiment, the optical imaging lens may satisfy a Semi-FOV ≧ 40.0, where the Semi-FOV is a maximum half field angle of the optical imaging lens. The optical imaging lens meets the condition 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 ≦ 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 plane, and ImgH is a half of a diagonal length of the effective pixel area on the imaging plane. The optical imaging lens meets the condition that TTL/ImgH is less than 1.7, is favorable for realizing larger imaging height and shorter optical total length, is favorable for realizing miniaturization of the optical imaging lens, and is favorable for 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 an 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 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 can be suitable for portable electronic products. The optical imaging lens has the advantages that imaging requirements are met, and meanwhile large aperture and a large image plane are achieved.

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 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 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 convex object-side surface S5 and a concave 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 convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a concave 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/distance, 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 4.10mm, the distance TTL from the object-side surface of the first lens to the imaging plane along the optical axis is 6.22mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane 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 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 the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to 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 image heights. 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 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 power, and has a concave object-side surface S1 and a convex 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 convex object-side surface S5 and a concave 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 convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a concave 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 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 plane along the optical axis is 6.30mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 3.99mm, and the maximum half field angle Semi-FOV of the optical imaging lens is 41.5 °.

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

TABLE 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

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

Flour mark

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

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 image heights. Fig. 4D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the optical imaging lens 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 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 plane along the optical axis is 6.50mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 3.99mm, and the maximum half field angle Semi-FOV of the optical imaging lens is 40.4 °.

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

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

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

Flour mark

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 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 image heights. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the optical imaging lens according to embodiment 3 can achieve good imaging quality.

Example 4

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

As shown in fig. 7, the optical imaging lens, in order from an object side to an image side along an optical axis, comprises: 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 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 convex object-side surface S5 and a concave 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 positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a concave 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 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 plane along the optical axis is 6.28mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane 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 embodiment 4, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 7

TABLE 8

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

Example 5

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

As shown in fig. 9, the optical imaging lens, in order from an object side to an image side along an optical axis, comprises: 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 plane along the optical axis is 6.43mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane 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 the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Watch 10

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

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

Conditions/examples	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 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. An optical imaging lens assembly includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element,

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

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

the fifth lens, the sixth lens and the seventh lens have focal power;

wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy f/EPD < 1.9;

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

2. The optical imaging lens of claim 1, wherein 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。

3. the optical imaging lens of claim 1, wherein the radius of curvature R2 of the image side surface of the first lens and the 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 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。

5. the optical imaging lens of claim 1, wherein 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:

4.5＜R7/R6＜6.0。

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

-2.0＜(R3-R4)/(R3+R4)＜-1.0。

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

2.5＜(SAG51+SAG42)/(SAG51-SAG42)＜3.5。

8. the optical imaging lens of 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, characterized in that a sum Σ AT of a spacing distance T45 of the fourth lens and the fifth lens along the optical axis and an air spacing distance on the optical axis between any adjacent two lenses among the first lens to the seventh lens satisfies:

0＜T45/∑AT＜0.5。

10. an optical imaging lens assembly includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element,

the third lens has positive optical power;

the fifth lens, the sixth lens and the seventh lens have 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.