CN112363300A

CN112363300A - Optical imaging lens group

Info

Publication number: CN112363300A
Application number: CN202011321329.XA
Authority: CN
Inventors: 闻人建科; 孔旭乐; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-02-12

Abstract

The application discloses an optical imaging lens assembly, which comprises, in order from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having an optical power; a third lens with focal power, wherein the image side surface of the third lens is convex; a fourth lens having a positive optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having a refractive power, an image-side surface of which is convex; and an eighth lens having a negative optical power. The effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging lens group satisfy that: 2 < f4/f < 3.

Description

Optical imaging lens group

Technical Field

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

Background

With the development of optical technology, higher requirements are also put forward on the market for the imaging quality of optical imaging lens groups applied to electronic products such as smart phones. Meanwhile, the imaging quality of the optical imaging lens group is higher and higher, and especially, the imaging quality of the mobile phone lens approaches reality in an environment with sufficient light. However, due to the limitation of the size of the lens, the imaging quality of the lens in a low-light environment is not ideal.

At present, most lens designers adopt a plurality of pictures with different exposure values to be simultaneously shot and synthesize a picture with accurate exposure of the whole picture through an algorithm in order to reduce noise generated by the lens during low-light shooting. Although the technology can effectively inhibit noise, the color distortion of the synthesized picture is obvious, and particularly when the wide-angle lens is used for shooting, the color distortion is more prominent.

Disclosure of Invention

An aspect of the present application provides an optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens having a negative optical power; a second lens having an optical power; a third lens with focal power, wherein the image side surface of the third lens is convex; a fourth lens having a positive optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having a refractive power, an image-side surface of which is convex; and an eighth lens having a negative optical power. The effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging lens group can satisfy: 2 < f4/f < 3.

In one embodiment, the object-side surface of the first lens element to the image-side surface of the eighth lens element has at least one aspherical mirror surface.

In one embodiment, the effective focal length f1 of the first lens and the effective focal length f8 of the eighth lens may satisfy: 0.5 < f1/f8 < 1.

In one embodiment, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens may satisfy: 0.8 < | f7/f8| < 1.3.

In one embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy: 0 < 10 × (R3-R4)/(R3+ R4) < 1.

In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R16 of the image-side surface of the eighth lens may satisfy: 0.5 < R2/R16 < 1.5.

In one embodiment, the central thickness CT2 of the second lens on the optical axis and the edge thickness ET2 of the second lens can satisfy: 0.9 < CT2/ET2 < 1.3.

In one embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis may satisfy: CT1/CT2+ CT1/CT3 < 1.

In one embodiment, a distance T45 between the image-side surface of the fourth lens and the object-side surface of the fifth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, a distance T56 between the image-side surface of the fifth lens and the object-side surface of the sixth lens on the optical axis, and a central thickness CT6 of the sixth lens on the optical axis may satisfy: 0.5 < T45/(CT5+ T56+ CT6) < 1.

In one embodiment, the central thickness CT7 of the seventh lens on the optical axis and the central thickness CT8 of the eighth lens on the optical axis may satisfy: 2.9 < CT7/CT8 < 4.5.

In one embodiment, the distance T78 between the image-side surface of the seventh lens element and the object-side surface of the eighth lens element on the optical axis and the central thickness CT8 of the eighth lens element on the optical axis satisfy: 0.9 < T78/CT8 < 1.4.

In one embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT82 of the image-side surface of the eighth lens may satisfy: 1 < DT11/DT82 < 1.5.

In one embodiment, the maximum effective radius DT41 of the object-side surface of the fourth lens and the maximum effective radius DT52 of the image-side surface of the fifth lens may satisfy: 0.6 < DT41/DT52 < 1.

In one embodiment, the distance SAG11 on the optical axis from the intersection point of the object-side surface of the first lens and the optical axis to the effective radius vertex of the object-side surface of the first lens and the central thickness CT1 on the optical axis of the first lens satisfy: 0.6 < SAG11/CT1 < 1.1.

In one embodiment, the edge thickness ET1 of the first lens and the edge thickness ET8 of the eighth lens may satisfy: 0.8 < ET1/ET8 < 1.2.

In one embodiment, a distance SAG72 on the optical axis from the intersection point of the image-side surface of the seventh lens and the optical axis to the effective radius vertex of the image-side surface of the seventh lens and a distance SAG81 on the optical axis from the intersection point of the object-side surface of the eighth lens and the optical axis to the effective radius vertex of the object-side surface of the eighth lens may satisfy: 0.3 < SAG72/SAG81 < 0.6.

In one embodiment, the distance SAG71 on the optical axis from the intersection point of the object-side surface of the seventh lens and the optical axis to the effective radius vertex of the object-side surface of the seventh lens and the central thickness CT7 on the optical axis of the seventh lens may satisfy: 0.2 < SAG71/CT7 < 0.5.

In one embodiment, the object side surface of the fourth lens is convex; and the object side surface of the seventh lens is a convex surface.

In one embodiment, the maximum field angle FOV of the optical imaging lens group may satisfy: tan (FOV/2) > 2.

Another aspect of the present disclosure provides an optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens having a negative optical power; a second lens having an optical power; a third lens with focal power, wherein the image side surface of the third lens is convex; a fourth lens having a positive refractive power, an object-side surface of which is convex; a fifth lens having optical power; a sixth lens having optical power; a seventh lens element with a focal power, wherein the object-side surface is convex and the image-side surface is convex; and an eighth lens having a negative optical power.

In one embodiment, the effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging lens group satisfy: 2 < f4/f < 3.

The application provides an optical imaging lens group which is applicable to portable electronic products, and has wide angle, miniaturization and good imaging quality through reasonable distribution focal power and optimization of optical parameters.

Drawings

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

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

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

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

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

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

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

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

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

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

fig. 10A to 10C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens group of example 5;

fig. 11 is a schematic view showing a structure of an optical imaging lens group according to embodiment 6 of the present application; and

fig. 12A to 12C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens group of embodiment 6;

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

fig. 14A to 14C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of an optical imaging lens group of example 7;

fig. 15 is a schematic view showing a structure of an optical imaging lens group according to embodiment 8 of the present application; and

fig. 16A to 16C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens group of example 8.

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 group according to an exemplary embodiment of the present application may include eight lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, respectively. The eight lenses are arranged in order from the object side to the image side along the optical axis. Any adjacent two lenses of the first lens to the eighth lens may have a spacing distance therebetween.

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 can have positive focal power or negative focal power, and the image side surface of the third lens can be a convex surface; the fourth lens may have a positive optical 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 can have positive focal power or negative focal power, and the image side surface of the seventh lens can be a convex surface; and the eighth lens may have a negative optical power.

In an exemplary embodiment, the object side surface of the fourth lens may be convex; and the object side surface of the seventh lens element may be convex.

In an exemplary embodiment, by reasonably setting the focal power and the surface type characteristics of the first lens to the eighth lens, various aberrations such as spherical aberration, coma aberration and chromatic aberration can be balanced by each lens, so that the performance of the optical imaging lens group can be effectively improved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 2 < f4/f < 3, wherein f4 is the effective focal length of the fourth lens, and f is the total effective focal length of the optical imaging lens group. More specifically, f4 and f further satisfy: 2.2 < f4/f < 2.6. Satisfying 2 < f4/f < 3, can effectively control the total effective focal length of the optical imaging lens group, and when the optical imaging lens group is matched with chips with the same size, the optical imaging lens group is beneficial to increasing the field angle and expanding the imaging range.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < f1/f8 < 1, wherein f1 is the effective focal length of the first lens and f8 is the effective focal length of the eighth lens. More specifically, f1 and f8 may further satisfy: f1/f8 is more than 0.6 and less than 0.9. Satisfying 0.5 < f1/f8 < 1, not only can effectively balance various aberrations and improve imaging quality, but also can make the first lens and the eighth lens mutually symmetrical.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.8 < | f7/f8| < 1.3, where f7 is the effective focal length of the seventh lens and f8 is the effective focal length of the eighth lens. More specifically, f7 and f8 may further satisfy: 0.9 < | f7/f8| < 1.1. The requirement that the power of the seventh lens and the power of the eighth lens are close to each other is less than 0.8 < | f7/f8| < 1.3, so that the balance of aberration of the seventh lens and the eighth lens is facilitated, and the performance of the optical imaging lens group is effectively improved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0 < 10 × (R3-R4)/(R3+ R4) < 1, where R3 is the radius of curvature of the object-side surface of the second lens and R4 is the radius of curvature of the image-side surface of the second lens. More specifically, R3 and R4 may further satisfy: 0.2 < 10 × (R3-R4)/(R3+ R4) < 0.6. The optical lens meets the requirement that 0 is more than 10 x (R3-R4)/(R3+ R4) < 1, can effectively control the effective focal length of the second lens, and is beneficial to the light convergence of the second lens.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < R2/R16 < 1.5, wherein R2 is a radius of curvature of an image-side surface of the first lens, and R16 is a radius of curvature of an image-side surface of the eighth lens. More specifically, R2 and R16 may further satisfy: 0.6 < R2/R16 < 1.0. The requirement that R2/R16 is more than 0.5 and less than 1.5 is met, the first lens and the eighth lens can be controlled to be in a symmetrical structure, and the balance of aberrations such as coma aberration and chromatic aberration of the optical imaging lens group is facilitated, so that the imaging quality is improved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.9 < CT2/ET2 < 1.3, wherein CT2 is the central thickness of the second lens on the optical axis and ET2 is the edge thickness of the second lens. More specifically, CT2 and ET2 further satisfy: 1.0 < CT2/ET2 < 1.2. The requirements of 0.9 < CT2/ET2 < 1.3 are met, the thickness uniformity of the lens of the second lens is favorably controlled, the machinability of the second lens can be effectively improved, and the production yield of the whole optical imaging lens group can be improved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: CT1/CT2+ CT1/CT3 < 1, wherein CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. More specifically, CT1, CT2, and CT3 may further satisfy: CT1/CT2+ CT1/CT3 < 0.9. The requirement of CT1/CT2+ CT1/CT3 < 1 is met, the central thickness of the first lens, the second lens and the third lens is controlled, and the manufacturability of the three lenses is enhanced.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < T45/(CT5+ T56+ CT6) < 1, wherein T45 is an axial separation distance between an image-side surface of the fourth lens and an object-side surface of the fifth lens, CT5 is an axial center thickness of the fifth lens, T56 is an axial separation distance between an image-side surface of the fifth lens and an object-side surface of the sixth lens, and CT6 is an axial center thickness of the sixth lens. More specifically, T45, CT5, T56 and CT6 may further satisfy: 0.8 < T45/(CT5+ T56+ CT6) < 1. The requirements of 0.5 < T45/(CT5+ T56+ CT6) < 1 are met, the molding manufacturability of the fifth lens and the sixth lens is facilitated, and the assembly manufacturability is facilitated to be improved by controlling the distance among the fourth lens, the fifth lens and the sixth lens.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 2.9 < CT7/CT8 < 4.5, where CT7 is the central thickness of the seventh lens on the optical axis and CT8 is the central thickness of the eighth lens on the optical axis. More specifically, CT7 and CT8 further satisfy: 2.9 < CT7/CT8 < 4.2. The requirements of 2.9 < CT7/CT8 < 4.5 are met, the process is favorable for the lens technology of the seventh lens and the eighth lens, and the forming risk of the optical imaging lens group can be effectively reduced.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.9 < T78/CT8 < 1.4, wherein T78 is a distance between an image-side surface of the seventh lens and an object-side surface of the eighth lens on an optical axis, and CT8 is a central thickness of the eighth lens on the optical axis. The requirement that T78/CT8 is more than 0.9 and less than 1.4 is met, so that the manufacturability of the eighth lens is improved, and the aberration is balanced.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 1 < DT11/DT82 < 1.5, where DT11 is the maximum effective radius of the object-side surface of the first lens and DT82 is the maximum effective radius of the image-side surface of the eighth lens. More specifically, DT11 and DT82 further satisfy: 1.1 < DT11/DT82 < 1.5. The optical imaging lens group satisfies 1 < DT11/DT82 < 1.5, which is beneficial to forming a symmetrical structure of the optical imaging lens group so as to effectively balance the aberration of the optical imaging lens group, thereby being beneficial to improving the imaging quality and simultaneously being beneficial to reducing the size of the optical imaging lens group.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.6 < DT41/DT52 < 1, where DT41 is the maximum effective radius of the object-side surface of the fourth lens and DT52 is the maximum effective radius of the image-side surface of the fifth lens. More specifically, DT41 and DT52 further satisfy: 0.6 < DT41/DT52 < 0.8. The optical imaging lens group satisfies 0.6 < DT41/DT52 < 1, which is beneficial to improving the imaging quality of the optical imaging lens group and reducing the size of the optical imaging lens group.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.6 < SAG11/CT1 < 1.1, wherein SAG11 is the distance on the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens, and CT1 is the central thickness of the first lens on the optical axis. The requirement that 0.6 < SAG11/CT1 < 1.1 is met is favorable for controlling the height loss of SAG11 and the central thickness CT1 of the object side of the first lens, and the forming manufacturability of the first lens can be effectively improved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.8 < ET1/ET8 < 1.2, wherein ET1 is the edge thickness of the first lens and ET8 is the edge thickness of the eighth lens. More specifically, ET1 and ET8 further satisfy: 0.8 < ET1/ET8 < 1.1. The requirements that ET1/ET8 is more than 0.8 and less than 1.2 are met, the manufacturability of the first lens and the eighth lens is improved, and the production yield of the optical imaging lens group is improved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.3 < SAG72/SAG81 < 0.6, wherein SAG72 is a distance on the optical axis from the intersection point of the image-side surface of the seventh lens and the optical axis to the effective radius vertex of the image-side surface of the seventh lens, and SAG81 is a distance on the optical axis from the intersection point of the object-side surface of the eighth lens and the optical axis to the effective radius vertex of the object-side surface of the eighth lens. More specifically, SAG72 and SAG81 further may satisfy: 0.4 < SAG72/SAG81 < 0.6. The requirements that the SAG72/SAG81 is more than 0.3 and less than 0.6 are met, the shapes of the seventh lens and the eighth lens are favorably controlled, the seventh lens and the eighth lens can meet the existing processing conditions, and the production yield of the optical imaging lens group is favorably improved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.2 < SAG71/CT7 < 0.5, wherein SAG71 is a distance on the optical axis from 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 CT7 is a center thickness of the seventh lens on the optical axis. The requirement that SAG71/CT7 is more than 0.2 and less than 0.5 is met, the shape of the seventh lens is favorably controlled, and the manufacturability of the seventh lens is improved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: tan (FOV/2) > 2, where FOV is the maximum field angle of the optical imaging lens group. More specifically, the FOV may further satisfy: tan (FOV/2) > 2.1. The requirement of tan (FOV/2) > 2 is favorable for increasing the field angle of the optical imaging lens group, so that the optical imaging lens group has wide-angle characteristics, and further the optical imaging lens group generates stronger perspective effect.

In an exemplary embodiment, an optical imaging lens group according to the present application further includes a stop disposed between the third lens and the fourth lens. Optionally, the optical imaging lens group may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on an imaging surface.

The application provides an optical imaging lens group with characteristics of miniaturization, wide angle, large aperture, high imaging quality and the like. The optical imaging lens group according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above eight lenses. This application is through providing eight big aperture super wide angle optical imaging lens group of formula, can provide more light incident volume, avoids producing the noise point when being favorable to super wide angle camera lens to shoot under the low light environment. By reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the axial distance between each lens and the like, incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the optical imaging lens group is more favorable for production and processing.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the eighth 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, the seventh lens, and the eighth lens is an aspherical mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.

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

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

Example 1

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

As shown in fig. 1, the optical imaging lens assembly includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a third lens element E3, a stop STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image plane S19.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave 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 positive power, and has a convex object-side surface S13 and a convex image-side surface S14. The eighth lens element E8 has negative power, and has a convex object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

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

TABLE 1

In this example, the total effective focal length f of the optical imaging lens group is 1.79mm, the maximum field angle FOV of the optical imaging lens group is 136.8 °, and the aperture value Fno of the optical imaging lens group is 2.00.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the eighth lens E8 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. The high-order term coefficients A that can be used for the aspherical mirror surfaces S1 through S18 in example 1 are shown in tables 2-1 and 2-2 below₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.9478E-02

-1.4242E-02

3.9887E-03

-7.0024E-04

7.3964E-05

-4.0628E-06

7.6833E-08

S2

-9.3128E-03

-4.6865E-02

7.1158E-01

-5.0209E+00

2.2473E+01

-6.8041E+01

1.4416E+02

S3

-3.7092E-02

2.8621E-02

-1.4155E-03

-1.3397E-02

1.1501E-02

-4.4412E-03

6.3418E-04

S4

1.9694E-03

4.5633E-02

5.8832E-02

-2.6178E-01

4.3356E-01

-3.3195E-01

9.2670E-02

S5

-1.1845E-02

4.7953E-02

-1.0810E-01

2.1688E-01

-2.5166E-01

1.6528E-01

-5.1984E-02

S6

8.4443E-02

-1.5019E-01

3.6397E-01

-6.3136E-01

6.6671E-01

-3.8273E-01

8.7238E-02

S7

3.7932E-02

-8.0729E-02

-9.3548E-02

2.0270E+00

-9.8486E+00

2.8192E+01

-5.3212E+01

S8

-1.3739E-01

2.0480E-01

-2.5072E+00

3.0194E+01

-2.3463E+02

1.2024E+03

-4.1794E+03

S9

-3.2970E-01

3.9061E-01

-2.2301E+00

1.2037E+01

-4.2446E+01

1.0455E+02

-1.8342E+02

S10

-3.8269E-01

9.2321E-01

-4.5008E+00

1.7510E+01

-4.5128E+01

7.9312E+01

-9.6819E+01

S11

-1.9250E-01

8.0274E-01

-4.0057E+00

1.4871E+01

-3.7545E+01

6.5581E+01

-8.1015E+01

S12

-1.7918E-01

1.7699E-01

7.2470E-03

-4.1359E-01

1.0715E+00

-1.7928E+00

2.0650E+00

S13

-1.1736E-01

7.7508E-02

2.1336E-03

-9.1074E-02

1.3092E-01

-1.1121E-01

6.5035E-02

S14

-9.6973E-03

-7.5806E-02

1.2392E-01

-9.5744E-02

2.8070E-03

5.7226E-02

-5.2792E-02

S15

-3.0251E-01

-1.7786E-01

5.8155E-01

-4.9956E-01

7.0003E-02

2.4597E-01

-2.6037E-01

S16

-2.5068E-01

-2.5635E-01

1.1003E+00

-2.1565E+00

2.9599E+00

-3.0271E+00

2.3258E+00

TABLE 2-1

Tables 2 to 2

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

Example 2

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

As shown in fig. 3, the optical imaging lens assembly includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a third lens element E3, a stop STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image plane S19.

In this example, the total effective focal length f of the optical imaging lens group is 1.80mm, the maximum field angle FOV of the optical imaging lens group is 131.6 °, and the aperture value Fno of the optical imaging lens group is 2.08.

Table 3 shows a basic parameter table of the optical imaging lens group of embodiment 2, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 4-1, 4-2 show the 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 the formula (1) given in example 1 above.

TABLE 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.4956E-02

-1.0752E-02

2.8352E-03

-4.8043E-04

4.9828E-05

-2.7608E-06

5.7356E-08

S2

-1.5189E-03

-2.1097E-02

2.8343E-01

-1.8094E+00

7.4647E+00

-2.0975E+01

4.1343E+01

S3

-2.7010E-02

1.6824E-02

2.0830E-03

-7.4215E-03

4.6193E-03

-1.5626E-03

2.0613E-04

S4

9.9309E-03

2.3767E-02

7.8915E-02

-2.3445E-01

3.5129E-01

-2.6262E-01

7.2798E-02

S5

-9.6803E-03

2.9728E-02

-5.1661E-02

1.1370E-01

-1.4397E-01

1.0023E-01

-3.2189E-02

S6

8.8846E-02

-1.7514E-01

4.2630E-01

-7.4861E-01

8.2046E-01

-4.8983E-01

1.1623E-01

S7

4.4278E-02

-2.6415E-02

-1.1322E+00

1.0156E+01

-4.8263E+01

1.4539E+02

-2.8857E+02

S8

-1.2395E-01

-4.4918E-03

1.5260E+00

-1.7336E+01

1.1987E+02

-5.5656E+02

1.8050E+03

S9

-3.2240E-01

2.5778E-01

-8.8290E-01

3.3717E+00

-5.2029E+00

-5.6211E+00

4.5637E+01

S10

-3.7959E-01

7.7477E-01

-3.3673E+00

1.2608E+01

-3.1529E+01

5.3970E+01

-6.4401E+01

S11

-1.9276E-01

6.9075E-01

-3.0580E+00

1.0663E+01

-2.5761E+01

4.3129E+01

-5.0804E+01

S12

-1.8923E-01

2.1917E-01

-1.1453E-01

-5.1309E-02

1.8570E-01

-2.9349E-01

3.5008E-01

S13

-1.2886E-01

9.9536E-02

-4.1310E-02

-1.5951E-02

3.3458E-02

-2.1155E-02

6.9826E-03

S14

-2.0476E-02

-4.9695E-02

7.2181E-02

-4.8574E-02

-3.1033E-04

2.2817E-02

-1.5023E-02

S15

-3.7844E-01

7.9889E-02

1.3195E-01

-1.6566E-02

-2.8912E-01

4.5181E-01

-3.6084E-01

S16

-3.5408E-01

1.4690E-01

2.0189E-01

-6.0201E-01

8.7226E-01

-8.7755E-01

6.4961E-01

TABLE 4-1

TABLE 4-2

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 2, which represents a 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 group of embodiment 2. Fig. 4C shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 2, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 4A to 4C, the optical imaging lens assembly according to embodiment 2 can achieve good imaging quality.

Example 3

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

As shown in fig. 5, the optical imaging lens assembly includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a third lens element E3, a stop STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image plane S19.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave 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 positive power, and has a convex object-side surface S13 and a convex image-side surface S14. The eighth lens element E8 has negative power, and has a convex object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens group is 1.81mm, the maximum field angle FOV of the optical imaging lens group is 131.1 °, and the aperture value Fno of the optical imaging lens group is 2.08.

Table 5 shows a basic parameter table of the optical imaging lens group of embodiment 3, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 6-1, 6-2 show the 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 the formula (1) given in example 1 above.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.1469E-02

-7.8714E-03

1.6024E-03

-1.7858E-04

6.6928E-06

6.0739E-07

-5.3947E-08

S2

-6.5908E-04

2.0038E-03

-7.8345E-03

3.1130E-01

-2.1946E+00

8.6064E+00

-2.1889E+01

S3

-2.6029E-02

1.8863E-02

-4.0429E-03

4.0699E-03

-4.5927E-03

1.6539E-03

-2.0749E-04

S4

8.3071E-03

3.5761E-02

1.5238E-02

-4.5043E-02

6.3635E-02

-5.4905E-02

1.5974E-02

S5

-1.0209E-02

1.9538E-02

-1.3557E-02

2.2234E-02

-2.4958E-02

1.8181E-02

-7.2167E-03

S6

9.2482E-02

-2.1612E-01

5.7180E-01

-1.0656E+00

1.2243E+00

-7.5368E-01

1.8356E-01

S7

5.5027E-02

-1.4420E-01

-1.4060E-01

3.9310E+00

-2.1359E+01

6.6071E+01

-1.3002E+02

S8

-1.1852E-01

2.1212E-02

7.9779E-01

-8.6617E+00

5.4611E+01

-2.2722E+02

6.5608E+02

S9

-3.1216E-01

2.1880E-01

-7.6261E-01

3.4587E+00

-8.6537E+00

1.3064E+01

-9.7238E+00

S10

-3.9834E-01

7.7834E-01

-2.7110E+00

8.3762E+00

-1.7460E+01

2.4583E+01

-2.3444E+01

S11

-2.3778E-01

7.7782E-01

-2.5355E+00

6.4205E+00

-1.1004E+01

1.1356E+01

-4.5137E+00

S12

-2.1247E-01

3.0827E-01

-3.2209E-01

3.7374E-01

-6.6131E-01

1.1278E+00

-1.4171E+00

S13

-1.4473E-01

1.4383E-01

-1.0909E-01

4.7134E-02

5.2233E-04

-1.7810E-02

1.5485E-02

S14

-3.2463E-02

-2.0699E-02

5.6522E-02

-9.0740E-02

9.9387E-02

-8.3674E-02

5.4492E-02

S15

-4.6171E-01

2.2378E-01

1.0031E-01

-3.1589E-01

3.0975E-01

-1.6736E-01

4.8466E-02

S16

-4.5562E-01

3.6253E-01

-6.5881E-02

-4.3212E-01

9.0385E-01

-1.0663E+00

8.6094E-01

TABLE 6-1

TABLE 6-2

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

Example 4

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

As shown in fig. 7, the optical imaging lens assembly includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a third lens element E3, a stop STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image plane S19.

In this example, the total effective focal length f of the optical imaging lens group is 1.74mm, the maximum field angle FOV of the optical imaging lens group is 138.0 °, and the aperture value Fno of the optical imaging lens group is 2.08.

Table 7 shows a basic parameter table of the optical imaging lens group of embodiment 4, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 8-1, 8-2 show the 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 the formula (1) given in example 1 above.

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.3569E-02

-8.0350E-03

1.4519E-03

-1.2316E-04

-1.1957E-06

1.0887E-06

-6.3007E-08

S2

-1.8388E-03

-9.9866E-03

-5.4981E-02

1.5671E+00

-1.0699E+01

4.0767E+01

-1.0027E+02

S3

-2.4742E-02

1.5653E-02

2.8500E-03

-3.8907E-03

2.0182E-04

2.6403E-04

-5.1817E-05

S4

1.4526E-02

2.7532E-02

3.9805E-02

-9.4704E-02

1.1251E-01

-7.6872E-02

1.9199E-02

S5

-8.2038E-03

1.4514E-02

-6.4771E-04

-1.0152E-02

1.7070E-02

-8.6410E-03

0.0000E+00

S6

8.1279E-02

-1.8864E-01

4.6662E-01

-7.8886E-01

8.1028E-01

-4.4321E-01

9.6093E-02

S7

4.3678E-02

-6.0510E-02

-7.8561E-01

7.2025E+00

-3.1997E+01

8.8260E+01

-1.5892E+02

S8

-1.1430E-01

-6.3993E-03

1.2900E+00

-1.4090E+01

9.2842E+01

-4.0906E+02

1.2581E+03

S9

-3.0763E-01

1.7575E-01

-5.7624E-01

3.2035E+00

-1.0277E+01

2.4422E+01

-4.5658E+01

S10

-4.0109E-01

7.3454E-01

-2.1745E+00

5.4749E+00

-7.9075E+00

3.8122E+00

7.1549E+00

S11

-2.5688E-01

8.4002E-01

-2.4815E+00

5.2763E+00

-6.4875E+00

1.2235E+00

1.0254E+01

S12

-2.4488E-01

4.2774E-01

-6.1333E-01

9.4118E-01

-1.6281E+00

2.5557E+00

-3.1040E+00

S13

-1.6908E-01

2.1690E-01

-2.3645E-01

1.8939E-01

-1.0119E-01

2.3751E-02

1.1428E-02

S14

-4.3736E-02

2.3821E-02

-5.0761E-03

-5.6086E-02

1.0951E-01

-1.1531E-01

8.0315E-02

S15

-5.4043E-01

3.7081E-01

2.4346E-03

-4.7604E-01

7.5929E-01

-6.8417E-01

4.0663E-01

S16

-5.3726E-01

5.5226E-01

-3.6790E-01

-9.5780E-02

6.3223E-01

-9.0427E-01

7.9054E-01

TABLE 8-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

1.6829E+02

-1.9704E+02

1.6113E+02

-9.0311E+01

3.3082E+01

-7.1377E+00

6.8817E-01

S3

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

1.8654E+02

-1.3726E+02

5.7317E+01

-1.0337E+01

0.0000E+00

S8

-2.7451E+03

4.2379E+03

-4.5266E+03

3.1805E+03

-1.3213E+03

2.4560E+02

0.0000E+00

S9

6.5602E+01

-6.9412E+01

5.1464E+01

-2.5019E+01

7.1098E+00

-8.9077E-01

0.0000E+00

S10

-1.5808E+01

1.4623E+01

-7.4957E+00

2.0765E+00

-2.4349E-01

0.0000E+00

S11

-1.9220E+01

1.8399E+01

-1.0793E+01

3.9174E+00

-8.1191E-01

7.3753E-02

0.0000E+00

S12

2.7016E+00

-1.5943E+00

5.9909E-01

-1.2863E-01

1.1978E-02

0.0000E+00

S13

-1.3136E-02

5.7084E-03

-1.3579E-03

1.7337E-04

-9.3015E-06

0.0000E+00

S14

-3.8369E-02

1.2358E-02

-2.5438E-03

2.9991E-04

-1.5321E-05

0.0000E+00

S15

-1.6045E-01

3.6099E-02

-2.7044E-04

-2.6764E-03

8.5357E-04

-1.2085E-04

6.8226E-06

S16

-4.7585E-01

2.0313E-01

-6.1468E-02

1.2898E-02

-1.7847E-03

1.4640E-04

-5.3909E-06

TABLE 8-2

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 4, which represents a 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 group of embodiment 4. Fig. 8C shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 4, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 8A to 8C, the optical imaging lens group according to embodiment 4 can achieve good imaging quality.

Example 5

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

As shown in fig. 9, the optical imaging lens assembly includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a third lens element E3, a stop STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image plane S19.

In this example, the total effective focal length f of the optical imaging lens group is 1.72mm, the maximum field angle FOV of the optical imaging lens group is 143.6 °, and the aperture value Fno of the optical imaging lens group is 2.08.

Table 9 shows a basic parameter table of the optical imaging lens group of embodiment 5, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 10-1, 10-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 9

TABLE 10-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

1.9111E+02

-2.2122E+02

1.7804E+02

-9.7904E+01

3.5111E+01

-7.4043E+00

6.9681E-01

S3

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

1.1619E+02

-8.5123E+01

3.5353E+01

-6.3315E+00

0.0000E+00

S8

-1.3268E+03

1.7958E+03

-1.7450E+03

1.1613E+03

-4.7448E+02

8.9411E+01

0.0000E+00

S9

1.8084E+02

-1.9508E+02

1.4524E+02

-7.0497E+01

1.9998E+01

-2.5082E+00

0.0000E+00

S10

-1.5356E+01

1.4885E+01

-7.7448E+00

2.1543E+00

-2.5239E-01

0.0000E+00

S11

-2.1756E+01

2.0775E+01

-1.2130E+01

4.3736E+00

-8.9903E-01

8.0877E-02

0.0000E+00

S12

2.5954E+00

-1.5326E+00

5.7599E-01

-1.2359E-01

1.1492E-02

0.0000E+00

S13

-6.0576E-03

3.9396E-03

-1.0830E-03

1.4986E-04

-8.4911E-06

0.0000E+00

S14

-1.8763E-02

6.9588E-03

-1.6089E-03

2.0784E-04

-1.1407E-05

0.0000E+00

S15

-3.3495E-02

-4.0011E-03

7.2120E-03

-3.2085E-03

7.7601E-04

-1.0145E-04

5.6017E-06

S16

-5.7004E-01

2.3924E-01

-7.1470E-02

1.4830E-02

-2.0301E-03

1.6475E-04

-5.9989E-06

TABLE 10-2

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 5, which represents a 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 group of embodiment 5. Fig. 10C shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 5, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 10A to 10C, the optical imaging lens group according to embodiment 5 can achieve good imaging quality.

Example 6

An optical imaging lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12C. Fig. 11 shows a schematic structural view of an optical imaging lens group according to embodiment 6 of the present application.

As shown in fig. 11, the optical imaging lens assembly includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a third lens element E3, a stop STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image plane S19.

In this example, the total effective focal length f of the optical imaging lens group is 1.70mm, the maximum field angle FOV of the optical imaging lens group is 148.3 °, and the aperture value Fno of the optical imaging lens group is 2.08.

Table 11 shows a basic parameter table of the optical imaging lens group of example 6, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 12-1, 12-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 11

TABLE 12-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

2.4393E+02

-2.6239E+02

1.9864E+02

-1.0359E+02

3.5437E+01

-7.1585E+00

6.4739E-01

S3

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

3.5905E+02

-2.6202E+02

1.0832E+02

-1.9283E+01

0.0000E+00

S8

6.4310E+03

-1.1432E+04

1.3675E+04

-1.0533E+04

4.7181E+03

-9.3371E+02

0.0000E+00

S9

9.7650E+01

-9.5627E+01

6.5447E+01

-2.9364E+01

7.6911E+00

-8.8419E-01

0.0000E+00

S10

5.3557E+00

2.6189E+00

-3.0437E+00

1.1015E+00

-1.4775E-01

0.0000E+00

S11

4.3003E+00

3.3103E+00

-3.9905E+00

1.8656E+00

-4.3961E-01

4.3006E-02

0.0000E+00

S12

2.9801E+00

-1.7712E+00

6.7309E-01

-1.4613E-01

1.3736E-02

0.0000E+00

S13

2.4797E-02

-3.6997E-03

1.4373E-04

3.5129E-05

-3.7631E-06

0.0000E+00

S14

-2.2201E-02

7.2818E-03

-1.5528E-03

1.9070E-04

-1.0132E-05

0.0000E+00

S15

-8.0173E-03

-1.8051E-02

1.0769E-02

-3.5201E-03

7.2682E-04

-8.7790E-05

4.6873E-06

S16

-6.2944E-01

2.6043E-01

-7.6772E-02

1.5726E-02

-2.1257E-03

1.7033E-04

-6.1242E-06

TABLE 12-2

Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 6, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 6. Fig. 12C shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 6, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 12A to 12C, the optical imaging lens group according to embodiment 6 can achieve good imaging quality.

Example 7

An optical imaging lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14C. Fig. 13 shows a schematic structural view of an optical imaging lens group according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging lens assembly includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a third lens element E3, a stop STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image plane S19.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave 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 positive power, and has a convex object-side surface S13 and a convex image-side surface S14. The eighth lens element E8 has negative power, and has a convex object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens group is 1.71mm, the maximum field angle FOV of the optical imaging lens group is 149.2 °, and the aperture value Fno of the optical imaging lens group is 2.08.

Table 13 shows a basic parameter table of the optical imaging lens group of example 7, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 14-1, 14-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

Watch 13

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.3670E-02

-7.7627E-03

1.3045E-03

-9.2679E-05

-4.3355E-06

1.1881E-06

-5.8198E-08

S2

-5.7090E-03

5.6922E-02

-7.0391E-01

5.0414E+00

-2.1899E+01

6.2739E+01

-1.2398E+02

S3

-2.0921E-02

1.2465E-02

3.9165E-03

-5.8280E-03

2.4830E-03

-6.6948E-04

8.0194E-05

S4

1.9363E-02

2.1002E-02

3.1897E-02

-8.0728E-02

1.0055E-01

-6.8006E-02

1.6617E-02

S5

-4.0837E-03

1.1619E-02

-1.1764E-02

1.9466E-02

-1.6663E-02

9.3364E-03

-3.2209E-03

S6

5.4478E-02

-1.2828E-01

3.3329E-01

-5.6213E-01

5.6333E-01

-2.9632E-01

6.1258E-02

S7

1.8288E-02

7.3216E-02

-1.6580E+00

1.1675E+01

-4.7606E+01

1.2442E+02

-2.1387E+02

S8

-1.0356E-01

5.5373E-02

-4.3622E-01

7.9550E+00

-7.6948E+01

4.4553E+02

-1.6723E+03

S9

-2.9497E-01

2.0323E-01

-7.9290E-01

4.0007E+00

-1.2092E+01

2.5824E+01

-4.1113E+01

S10

-4.0333E-01

9.1592E-01

-3.4813E+00

1.0960E+01

-2.3004E+01

3.2101E+01

-2.9696E+01

S11

-2.6666E-01

1.0188E+00

-3.8158E+00

1.1009E+01

-2.2434E+01

3.1730E+01

-3.1187E+01

S12

-2.6016E-01

4.9828E-01

-7.8075E-01

1.1261E+00

-1.5442E+00

1.9232E+00

-2.0413E+00

S13

-1.8564E-01

2.9931E-01

-4.1134E-01

4.4325E-01

-3.6944E-01

2.2983E-01

-1.0218E-01

S14

-6.1139E-02

6.9766E-02

-7.7293E-02

3.9886E-02

1.0530E-03

-1.8599E-02

1.6546E-02

S15

-5.2396E-01

3.3649E-01

2.8534E-05

-3.4099E-01

4.4016E-01

-2.7293E-01

7.3860E-02

S16

-5.0078E-01

4.7886E-01

-2.7506E-01

-1.7011E-01

6.4909E-01

-8.6205E-01

7.2462E-01

TABLE 14-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

1.7299E+02

-1.7188E+02

1.2090E+02

-5.8827E+01

1.8837E+01

-3.5711E+00

3.0373E-01

S3

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

2.3986E+02

-1.6834E+02

6.6863E+01

-1.1421E+01

0.0000E+00

S8

4.2286E+03

-7.2833E+03

8.4341E+03

-6.2850E+03

2.7226E+03

-5.2089E+02

0.0000E+00

S9

4.8859E+01

-4.2435E+01

2.5862E+01

-1.0328E+01

2.3858E+00

-2.3647E-01

0.0000E+00

S10

1.7669E+01

-6.2046E+00

9.6174E-01

5.8737E-02

-2.9219E-02

0.0000E+00

S11

2.1246E+01

-9.8576E+00

2.9820E+00

-5.3461E-01

4.4691E-02

-4.5271E-04

0.0000E+00

S12

1.6890E+00

-9.8750E-01

3.7203E-01

-8.0016E-02

7.4274E-03

0.0000E+00

S13

3.1058E-02

-6.0960E-03

6.9900E-04

-3.6874E-05

2.4199E-07

0.0000E+00

S14

-8.6839E-03

3.0003E-03

-6.5746E-04

8.1698E-05

-4.3453E-06

0.0000E+00

S15

1.2302E-02

-1.8772E-02

8.1446E-03

-2.1488E-03

3.7531E-04

-4.0304E-05

1.9977E-06

S16

-4.2277E-01

1.7513E-01

-5.1347E-02

1.0414E-02

-1.3889E-03

1.0953E-04

-3.8671E-06

TABLE 14-2

Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 7, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 7. Fig. 14C shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 7, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 14A to 14C, the optical imaging lens group according to embodiment 7 can achieve good imaging quality.

Example 8

An optical imaging lens group according to embodiment 8 of the present application is described below with reference to fig. 15 to 16C. Fig. 15 shows a schematic structural view of an optical imaging lens group according to embodiment 8 of the present application.

As shown in fig. 15, the optical imaging lens assembly includes, in order from an object side to an image side, a first lens element E1, a second lens element E2, a third lens element E3, a stop STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image plane S19.

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 concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave 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 positive power, and has a convex object-side surface S13 and a convex image-side surface S14. The eighth lens element E8 has negative power, and has a convex object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens group is 1.69mm, the maximum field angle FOV of the optical imaging lens group is 158.2 °, and the aperture value Fno of the optical imaging lens group is 2.08.

Table 15 shows a basic parameter table of the optical imaging lens group of embodiment 8, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 16-1, 16-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 8, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

Watch 15

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.7031E-02

-1.0441E-02

2.4441E-03

-3.7649E-04

3.7512E-05

-2.2138E-06

5.9391E-08

S2

-2.0507E-03

2.6244E-02

-3.4256E-01

2.5715E+00

-1.1344E+01

3.2557E+01

-6.3990E+01

S3

-1.9872E-02

1.3848E-02

1.3721E-03

-4.0687E-03

1.8690E-03

-5.5275E-04

7.0377E-05

S4

2.1365E-02

2.0549E-02

3.1831E-02

-8.4721E-02

9.9890E-02

-6.1249E-02

1.3273E-02

S5

-2.0739E-03

9.7080E-03

-7.2673E-03

4.3206E-03

4.3931E-03

-3.4825E-03

-2.3999E-04

S6

4.5382E-02

-1.0936E-01

2.9885E-01

-5.1923E-01

5.3194E-01

-2.8375E-01

5.9084E-02

S7

1.1677E-02

7.8822E-02

-1.5644E+00

1.0911E+01

-4.4372E+01

1.1566E+02

-1.9815E+02

S8

-1.0485E-01

1.6482E-01

-2.4552E+00

2.8547E+01

-2.0781E+02

9.9638E+02

-3.2588E+03

S9

-2.9820E-01

2.3599E-01

-1.0420E+00

5.3395E+00

-1.7044E+01

3.8606E+01

-6.4327E+01

S10

-3.9620E-01

8.2219E-01

-2.8883E+00

8.7244E+00

-1.7576E+01

2.3364E+01

-2.0288E+01

S11

-2.5236E-01

8.6082E-01

-2.8896E+00

7.5915E+00

-1.4090E+01

1.7772E+01

-1.4851E+01

S12

-2.7719E-01

5.5802E-01

-8.8424E-01

1.2648E+00

-1.8188E+00

2.4779E+00

-2.7977E+00

S13

-2.0467E-01

3.7505E-01

-5.5245E-01

6.1073E-01

-5.0895E-01

3.1512E-01

-1.4095E-01

S14

-7.1786E-02

8.1208E-02

-9.3587E-02

7.6227E-02

-6.3568E-02

5.5904E-02

-3.8666E-02

S15

-4.7152E-01

2.5882E-01

2.2056E-02

-2.2643E-01

1.8914E-01

1.9223E-02

-1.4497E-01

S16

-4.2817E-01

3.5284E-01

-1.1216E-01

-3.4034E-01

7.9090E-01

-9.5285E-01

7.6683E-01

TABLE 16-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

8.8437E+01

-8.6787E+01

6.0174E+01

-2.8821E+01

9.0746E+00

-1.6903E+00

1.4116E-01

S3

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

2.2127E+02

-1.5448E+02

6.0967E+01

-1.0334E+01

0.0000E+00

S8

7.3967E+03

-1.1653E+04

1.2503E+04

-8.7143E+03

3.5559E+03

-6.4447E+02

0.0000E+00

S9

7.8355E+01

-6.8185E+01

4.0781E+01

-1.5707E+01

3.4450E+00

-3.1800E-01

0.0000E+00

S10

1.0937E+01

-3.0925E+00

9.1618E-02

1.8576E-01

-3.5650E-02

0.0000E+00

S11

7.7472E+00

-2.0221E+00

-1.4123E-01

2.7795E-01

-7.9191E-02

7.9009E-03

0.0000E+00

S12

2.3486E+00

-1.3547E+00

4.9882E-01

-1.0480E-01

9.5239E-03

0.0000E+00

S13

4.3998E-02

-9.1596E-03

1.1829E-03

-8.2335E-05

2.1525E-06

0.0000E+00

S14

1.7796E-02

-5.1457E-03

8.8938E-04

-8.2787E-05

3.1129E-06

0.0000E+00

S15

1.1933E-01

-5.1306E-02

1.3176E-02

-2.0396E-03

1.8102E-04

-8.4278E-06

1.9668E-07

S16

-4.3546E-01

1.7667E-01

-5.0862E-02

1.0137E-02

-1.3288E-03

1.0295E-04

-3.5686E-06

TABLE 16-2

Fig. 16A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 8, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 16B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 8. Fig. 16C shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 8, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 16A to 16C, the optical imaging lens group according to embodiment 8 can achieve good imaging quality.

In summary, examples 1 to 8 each satisfy the relationship shown in table 17.

Conditional expression (A) example	1	2	3	4	5	6	7	8
									f4/f	2.53	2.45	2.35	2.34	2.36	2.29	2.28	2.27
f1/f8	0.67	0.73	0.78	0.76	0.74	0.74	0.75	0.72
									tan(FOV/2)	2.52	2.23	2.20	2.61	3.04	3.52	3.63	5.19
\|f7/f8\|	0.95	0.99	1.03	1.01	1.00	0.99	0.98	0.95
									10×(R3-R4)/(R3+R4)	0.53	0.51	0.59	0.52	0.41	0.39	0.40	0.30
R2/R16	0.66	0.74	0.82	0.87	0.85	0.85	0.90	0.84
									CT2/ET2	1.07	1.09	1.09	1.09	1.09	1.10	1.10	1.11
CT1/CT2+CT1/CT3	0.54	0.69	0.88	0.63	0.52	0.57	0.52	0.53
									T45/(CT5+T56+CT6)	0.96	0.95	0.94	0.92	0.88	0.87	0.88	0.85
CT7/CT8	3.52	3.62	3.86	4.09	3.81	3.53	3.57	3.00
									T78/CT8	1.16	1.20	1.28	1.34	1.24	1.15	1.16	0.97
DT11/DT82	1.23	1.19	1.23	1.30	1.32	1.36	1.35	1.38
									DT41/DT52	0.73	0.69	0.69	0.67	0.70	0.70	0.70	0.70
SAG11/CT1	1.06	0.76	0.63	0.85	0.97	0.86	0.83	0.70
									ET1/ET8	0.98	0.91	0.97	0.96	0.96	0.96	0.96	0.95
SAG72/SAG81	0.58	0.54	0.53	0.48	0.48	0.47	0.47	0.46
									SAG71/CT7	0.47	0.41	0.38	0.34	0.33	0.32	0.33	0.33

TABLE 17

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 may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens group 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 those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

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

a first lens having a negative optical power;

a second lens having an optical power;

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

a fourth lens having a positive optical power;

a fifth lens having optical power;

a sixth lens having optical power;

a seventh lens having a refractive power, an image-side surface of which is convex; and

an eighth lens having a negative optical power;

the effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging lens group satisfy that: 2 < f4/f < 3.

2. The optical imaging lens group of claim 1, wherein the effective focal length f1 of the first lens and the effective focal length f8 of the eighth lens satisfy: 0.5 < f1/f8 < 1.

3. The optical imaging lens group of claim 1, wherein the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: 0.8 < | f7/f8| < 1.3.

4. The optical imaging lens group of claim 1, wherein the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: 0 < 10 × (R3-R4)/(R3+ R4) < 1.

5. The optical imaging lens group of claim 1, wherein the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R16 of the image-side surface of the eighth lens satisfy: 0.5 < R2/R16 < 1.5.

6. The optical imaging lens group of claim 1 wherein a center thickness CT2 of the second lens on the optical axis and an edge thickness ET2 of the second lens satisfy: 0.9 < CT2/ET2 < 1.3.

7. The optical imaging lens group of claim 1, wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: CT1/CT2+ CT1/CT3 < 1.

8. The optical imaging lens group of claim 1, wherein a separation distance T45 between an image side surface of the fourth lens and an object side surface of the fifth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, a separation distance T56 between an image side surface of the fifth lens and an object side surface of the sixth lens on the optical axis, and a center thickness CT6 of the sixth lens on the optical axis satisfy: 0.5 < T45/(CT5+ T56+ CT6) < 1.

9. The optical imaging lens group of claim 1 wherein a center thickness CT7 of the seventh lens on the optical axis and a center thickness CT8 of the eighth lens on the optical axis satisfy: 2.9 < CT7/CT8 < 4.5.

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

a first lens having a negative optical power;

a second lens having an optical power;

a fourth lens having a positive refractive power, an object-side surface of which is convex;

a fifth lens having optical power;

a sixth lens having optical power;

a seventh lens element with a focal power, wherein the object-side surface is convex and the image-side surface is convex; and

an eighth lens having a negative optical power.