CN113866952A

CN113866952A - Optical imaging lens group

Info

Publication number: CN113866952A
Application number: CN202111174537.6A
Authority: CN
Inventors: 徐鑫垚; 李林阳; 吕赛锋; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2021-12-31
Anticipated expiration: 2041-10-09
Also published as: CN113866952B

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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens having optical power. The second lens has positive focal power; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; half of diagonal length ImgH of an effective pixel area on an imaging surface of the optical imaging lens group, total effective focal length F of the optical imaging lens group, and F number Fno of the optical imaging lens group satisfy: 1 < ImgH/f × Fno < 1.3; and the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens group satisfy: 0.2 < | f2+ f3|/f < 0.5.

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 rapid development of scientific technology, the optical imaging lens group suitable for portable electronic products such as smart phones is changing day by day, and the requirements of users on the imaging characteristics of the optical imaging lens group are higher and higher. In order to improve the competitiveness of the products of many lens manufacturers, researches are being carried out on how to balance the aberration generated by each lens by reasonably setting the focal power, the surface type and other characteristics of each lens, so that the imaging quality of the optical imaging lens group can be improved, and characteristics such as large aperture and large image plane can be obtained.

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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens having optical power. The second lens has positive focal power; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the half of diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group, the total effective focal length F of the optical imaging lens group and the F number Fno of the optical imaging lens group can satisfy: 1 < ImgH/f × Fno < 1.3; and the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens group can satisfy: 0.2 < | f2+ f3|/f < 0.5.

In one embodiment, at least one mirror surface of the object side surface of the first lens to the image side surface of the ninth lens is an aspherical mirror surface.

In one embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the combined focal length f12 of the first and second lenses may satisfy: 1 < (f1-f2)/f12 < 3.

In one embodiment, the effective focal length f9 of the ninth lens and the combined focal length f89 of the eighth lens and the ninth lens may satisfy: f9/f89 is more than 0.9 and less than 1.2.

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, the edge thickness ET1 of the first lens, and the edge thickness ET2 of the second lens may satisfy: 0.6 < (CT1-ET1)/(CT2-ET2) < 1.4.

In one embodiment, the central thickness CT9 of the ninth lens on the optical axis and the edge thickness ET9 of the ninth lens may satisfy: CT9/ET9 < 1.

In one embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT92 of the image-side surface of the ninth lens may satisfy: 0.4 < DT11/DT92 < 0.6.

In one embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT52 of the image-side surface of the fifth lens may satisfy: 0.9 < DT11/DT52 < 1.1.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy: l (R1-R2)/(R1+ R2) | < 0.3.

In one embodiment, the radius of curvature R17 of the object-side surface of the ninth lens, the radius of curvature R18 of the image-side surface of the ninth lens, and the effective focal length f9 of the ninth lens may satisfy: -3 < (R18-R17)/f9 < -2.

In one embodiment, a sum Σ AT of air intervals on the optical axis of any adjacent two lenses of the first to ninth lenses and a sum Σ CT of center thicknesses on the optical axis of the first to ninth lenses may satisfy: 0.6 < ∑ AT/Σ CT < 0.9.

In one embodiment, a sum Σ CT of 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 center thicknesses of the first to ninth lenses on the optical axis may satisfy: 0.3 < (CT1+ CT 2)/. Sigma CT < 0.4.

In one embodiment, a central thickness CT8 of the eighth lens on the optical axis, a central thickness CT9 of the ninth lens on the optical axis, and an air interval T89 of the eighth lens and the ninth lens on the optical axis may satisfy: 0.6 < (CT8+ CT9)/T89 < 1.3.

In one embodiment, the abbe number V3 of the third lens, the abbe number V4 of the fourth lens, the abbe number V8 of the eighth lens, and the abbe number V9 of the ninth lens may satisfy: 1 < (V3+ V4+ V8)/V9 < 1.1.

In one embodiment, a distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens group, a half ImgH of a diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group, and a half Semi-FOV of a maximum field angle of the optical imaging lens group may satisfy: 1 < TTL/ImgH × tan (Semi-FOV) < 1.5.

In one embodiment, the total effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group may satisfy: f/EPD < 1.6.

In one embodiment, the optical imaging lens group further includes a stop disposed between the object side and the first lens, and a distance SD on the optical axis from the stop to an image side surface of the ninth lens and a distance TTL on the optical axis from an object side surface of the first lens to an imaging surface of the optical imaging lens group satisfy: SD/TTL is more than 0.75 and less than 0.85.

In one embodiment, the total effective focal length f of the optical imaging lens group and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group may satisfy: imgH/f is more than 0.7 and less than 0.9.

In one embodiment, the entrance pupil diameter EPD of the optical imaging lens group and the distance SL on the optical axis from the diaphragm to the imaging surface of the optical imaging lens group may satisfy: 0.5 < EPD/SL < 0.8.

In one embodiment, the fourth lens element has a convex object-side surface and a concave image-side surface.

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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens having optical power. The second lens has positive focal power; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the half of diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group, the total effective focal length F of the optical imaging lens group and the F number Fno of the optical imaging lens group can satisfy: 1 < ImgH/f × Fno < 1.3; and the abbe number V3 of the third lens, the abbe number V4 of the fourth lens, the abbe number V8 of the eighth lens, and the abbe number V9 of the ninth lens may satisfy: 1 < (V3+ V4+ V8)/V9 < 1.1.

In one embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the total effective focal length f of the optical imaging lens group may satisfy: 0.2 < | f2+ f3|/f < 0.5.

The application provides an optical imaging lens group which is applicable to portable electronic products and has at least one beneficial effect of high pixel, large aperture, large image plane, good imaging quality and the like 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 2D respectively show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve 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 4D show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion 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 6D show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of an 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 8D show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of an optical imaging lens group of example 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 10D respectively show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve 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;

fig. 12A to 12D respectively show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve 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 14D respectively show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve 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 16D show an on-axis chromatic aberration curve, a chromatic aberration of magnification curve, an astigmatism curve, and a distortion curve, respectively, of an 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 nine 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, an eighth lens, and a ninth lens, respectively. The nine lenses are arranged along the optical axis in order from the object side to the image side. Any adjacent two lenses of the first lens to the ninth lens may have a spacing distance therebetween.

In an exemplary embodiment, the optical imaging lens group further includes a stop disposed between the object side and the first lens.

In an exemplary embodiment, the second lens may have a positive optical power. The second lens has positive focal power, and is beneficial to increasing the field angle and compressing the light ray incidence angle at the position of the diaphragm so as to reduce pupil aberration and improve the imaging quality.

In an exemplary embodiment, the object-side surface of the sixth lens element may be convex, and the image-side surface may be concave. The surface type arrangement of the sixth lens can adjust aberration and improve imaging quality.

In an exemplary embodiment, the object-side surface of the fourth lens element may be convex and the image-side surface may be concave. The surface type arrangement of the fourth lens can adjust aberration and improve imaging quality.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 1 < ImgH/F × Fno < 1.3, wherein ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group, F is the total effective focal length of the optical imaging lens group, and Fno is the F number of the optical imaging lens group. The requirement that ImgH/f is multiplied by Fno is more than 1.3 is met, and the effects of large image surface and large aperture can be realized.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.2 < | f2+ f3|/f < 0.5, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f is the total effective focal length of the optical imaging lens group. Satisfy 0.2 < | f2+ f3|/f < 0.5, be favorable to controlling optical imaging lens group's total effective focal length, be favorable to making optical imaging lens group possess the function of adjusting the light position, be favorable to shortening optical imaging lens group's overall length.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 1 < (f1-f2)/f12 < 3, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f12 is the combined focal length of the first lens and the second lens. Satisfying 1 < (f1-f2)/f12 < 3 is beneficial to fine adjustment of the spherical aberration of the lens group so as to reduce the aberration of the on-axis field of view.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.9 < f9/f89 < 1.2, wherein f9 is the effective focal length of the ninth lens and f89 is the combined focal length of the eighth lens and the ninth lens. The optical imaging lens group can meet the requirement that f9/f89 is more than 0.9 and less than 1.2, correct aberration and simultaneously help to shorten the total length of the optical imaging lens group properly so as to meet the requirement of light and thin lens group.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.6 < (CT1-ET1)/(CT2-ET2) < 1.4, wherein CT1 is the central thickness of the first lens in the optical axis, CT2 is the central thickness of the second lens in the optical axis, ET1 is the edge thickness of the first lens, and ET2 is the edge thickness of the second lens. Satisfies 0.6 < (CT1-ET1)/(CT2-ET2) < 1.4, which is beneficial to the stability of the lens group structure.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: CT9/ET9 < 1, wherein CT9 is the central thickness of the ninth lens on the optical axis, and ET9 is the edge thickness of the ninth lens. The requirement of CT9/ET9 is less than 1, which is beneficial to reducing the processing and assembling difficulty.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.4 < DT11/DT92 < 0.6, where DT11 is the maximum effective radius of the object-side surface of the first lens and DT92 is the maximum effective radius of the image-side surface of the ninth lens. The requirement of DT11/DT92 being more than 0.4 and less than 0.6 is met, the off-axis aberration can be corrected, and high image quality is realized.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.9 < DT11/DT52 < 1.1, where DT11 is the maximum effective radius of the object-side surface of the first lens and DT52 is the maximum effective radius of the image-side surface of the fifth lens. The condition that DT11/DT52 is more than 0.9 and less than 1.1 is met, the off-axis aberration can be corrected, and high image quality is achieved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: l (R1-R2)/(R1+ R2) | < 0.3, where R1 is the radius of curvature of the object-side surface of the first lens and R2 is the radius of curvature of the image-side surface of the first lens. Satisfy | (R1-R2)/(R1+ R2) | < 0.3, be favorable to making the coma of on-axis field of view and off-axis field of view less, make the optical imaging lens group have good image quality.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: -3 < (R18-R17)/f9 < -2, wherein R17 is the radius of curvature of the object-side surface of the ninth lens, R18 is the radius of curvature of the image-side surface of the ninth lens, and f9 is the effective focal length of the ninth lens. More specifically, R18, R17, and f9 may further satisfy: -3 < (R18-R17)/f9 < -2.2. Satisfy-3 < (R18-R17)/f9 < -2, is favorable for adjusting the power distribution of the whole lens group, is favorable for shortening the total length of the lens group, realizes miniaturization and is favorable for balancing the tolerance sensitivity of the lens group.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.6 < ∑ AT/Σ CT < 0.9, where Σ AT is a sum of air spaces on the optical axis of any adjacent two lenses of the first lens to the ninth lens, and Σ CT is a sum of central thicknesses on the optical axis of the first lens to the ninth lens. Satisfy 0.6 < ∑ AT/Σ CT < 0.9, help to control the distortion range of the lens battery rationally, make the lens battery have minor distortion.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.3 < (CT1+ CT 2)/. SIGMA CT < 0.4, where 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, SIGMA CT is the sum of the central thicknesses of the first to ninth lenses on the optical axis. The requirement of 0.3 < (CT1+ CT 2)/. Sigma CT < 0.4 is met, and the stability of the optical imaging lens group can be improved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.6 < (CT8+ CT9)/T89 < 1.3, wherein CT8 is the central thickness of the eighth lens on the optical axis, CT9 is the central thickness of the ninth lens on the optical axis, and T89 is the air space between the eighth lens and the ninth lens on the optical axis. Satisfying 0.6 < (CT8+ CT9)/T89 < 1.3 is beneficial to controlling the field curvature contribution quantity of each field of view of the optical imaging lens group in a reasonable range.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 1 < (V3+ V4+ V8)/V9 < 1.1, wherein V3 is the Abbe number of the third lens, V4 is the Abbe number of the fourth lens, V8 is the Abbe number of the eighth lens, and V9 is the Abbe number of the ninth lens. Satisfying 1 < (V3+ V4+ V8)/V9 < 1.1, the chromatic aberration of the optical imaging lens group can be made small.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 1 < TTL/ImgH × tan (Semi-FOV) < 1.5, where TTL is a distance on an optical axis from an object side surface of the first lens to an imaging surface of the optical imaging lens group, ImgH is half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens group, and Semi-FOV is half of a maximum field angle of the optical imaging lens group. The total effective focal length of the optical imaging lens group can be controlled within a reasonable range, and the lens group can be ensured to have a large field angle and simultaneously have a large enough image surface to present more detailed information of the shot scene. In an example, the Semi-FOV may satisfy a Semi-FOV > 37 °.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: f/EPD < 1.6, wherein f is the total effective focal length of the optical imaging lens group, and EPD is the entrance pupil diameter of the optical imaging lens group. More specifically, f and EPD may further satisfy: f/EPD is more than 1.1 and less than 1.6. The requirement that F/EPD is less than 1.6 is met, the optical imaging lens group has a large image surface and a small F number, the large-aperture imaging effect of the lens group can be ensured, and the imaging quality is good in a dark environment.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: and 0.75 < SD/TTL < 0.85, wherein SD is the distance between the diaphragm and the image side surface of the ninth lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the image plane of the optical imaging lens group on the optical axis. The requirement that SD/TTL is more than 0.75 and less than 0.85 is met, and the aberration generated by the diaphragm can be effectively controlled.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.7 < ImgH/f < 0.9, wherein f is the total effective focal length of the optical imaging lens group, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group. The requirement that ImgH/f is more than 0.7 and less than 0.9 is met, the whole lens group is lighter and thinner, and the miniaturization is favorably realized. The optical imaging lens group according to the present application may have a large image plane characteristic, and in an exemplary embodiment, ImgH may satisfy ImgH > 7.5 mm. In addition, the optical imaging lens group according to the present application may also have a short optical length while having a large image plane characteristic, for example, TTL may be in the range of 11.50mm to 12.80 mm.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < EPD/SL < 0.8, wherein EPD is the diameter of an entrance pupil of the optical imaging lens group, and SL is the distance on the optical axis from a diaphragm to an imaging surface of the optical imaging lens group. The requirement that EPD/SL is more than 0.5 and less than 0.8 is met, and coma, astigmatism, distortion, axial chromatic aberration and the like generated by the diaphragm can be effectively controlled.

In an exemplary embodiment, the effective focal length f1 of the first lens may be, for example, in the range of 19.96mm to 36.86mm, the effective focal length f2 of the second lens may be, for example, in the range of 10.7mm to 11.95mm, the effective focal length f3 of the third lens may be, for example, in the range of-16.04 mm to-13.98 mm, the effective focal length f5 of the fifth lens may be, for example, in the range of 49.24mm to 99.35mm, the effective focal length f7 of the seventh lens may be, for example, in the range of 9.59mm to 18.85mm, and the effective focal length f9 of the ninth lens may be, for example, in the range of-10.58 mm to-6.94 mm.

In an exemplary embodiment, an optical imaging lens group according to the present application further includes a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging surface. The application provides an optical imaging lens group with the characteristics of miniaturization, large image surface, large aperture, high pixel, 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 nine lenses. 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 ninth 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, the eighth lens, and the ninth lens is an aspherical mirror surface. Optionally, each of the object-side surface and the image-side surface of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens is an aspheric mirror surface.

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 nine lenses are exemplified in the embodiment, the optical imaging lens group is not limited to include nine 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 2D. 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, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an image plane S21.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave 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 concave image-side surface S8. The fifth lens element E5 has positive 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 concave object-side surface S15 and a concave image-side surface S16. The ninth lens element E9 has negative power, and has a concave object-side surface S17 and a concave image-side surface S18. Filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the respective surfaces S1 to S20 and is finally imaged on the imaging surface S21.

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 the present example, the total effective focal length f of the optical imaging lens group is 9.93mm, the total length TTL of the optical imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S21 of the optical imaging lens group) is 12.50mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S21 of the optical imaging lens group is 8.11mm, the half semifov of the maximum field angle of the optical imaging lens group is 38.40 °, and the entrance pupil diameter EPD of the optical imaging lens group is 7.32 mm.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 to the ninth lens E9 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、A₂₀And A₂₂。

TABLE 2-1

Flour mark	A14	A16	A18	A20	A22
						S1	6.0960E-08	-5.0456E-09	2.1300E-10	-3.6723E-12	0.0000E+00
S2	-5.3462E-07	2.4655E-08	-5.8893E-10	5.4097E-12	0.0000E+00
						S3	-4.5833E-07	1.4031E-08	-3.7342E-11	-4.8225E-12	0.0000E+00
S4	-3.8697E-07	1.9034E-08	-5.6167E-10	7.4910E-12	0.0000E+00
						S5	-4.8377E-07	3.2458E-08	-1.4355E-09	2.7258E-11	0.0000E+00
S6	2.4162E-06	-2.5389E-07	1.4740E-08	-3.6320E-10	0.0000E+00
						S7	3.2421E-06	-3.2438E-07	1.8060E-08	-4.3223E-10	0.0000E+00
S8	1.7995E-06	-1.6594E-07	8.5118E-09	-1.9004E-10	0.0000E+00
						S9	2.5766E-06	-1.7605E-07	6.2069E-09	-8.5186E-11	0.0000E+00
S10	4.2152E-08	1.9343E-08	-1.6702E-09	4.3755E-11	0.0000E+00
						S11	2.1322E-06	-1.3636E-07	4.8205E-09	-7.1948E-11	0.0000E+00
S12	3.2214E-06	-2.0055E-07	7.2662E-09	-1.3162E-10	7.6736E-13
						S13	1.1949E-06	-5.3228E-08	1.3261E-09	-1.4171E-11	0.0000E+00
S14	1.0750E-06	-3.8333E-08	7.4566E-10	-6.0890E-12	0.0000E+00
						S15	6.0400E-07	-1.9966E-08	3.6047E-10	-2.7228E-12	0.0000E+00
S16	9.5905E-08	-2.6097E-09	3.8555E-11	-2.3720E-13	0.0000E+00
						S17	-1.1998E-08	3.3250E-10	-4.5261E-12	2.4405E-14	0.0000E+00
S18	-3.5763E-09	7.8197E-11	-9.1987E-13	4.5152E-15	0.0000E+00

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 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. Fig. 2C shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 1. Fig. 2D shows a distortion curve of the optical imaging lens group of embodiment 1, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 2A to 2D, the optical imaging lens assembly of 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 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 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, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an image plane S21.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave 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 concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative 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 concave object-side surface S15 and a concave image-side surface S16. The ninth lens element E9 has negative power, and has a concave object-side surface S17 and a concave image-side surface S18. Filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the respective surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In the present example, the total effective focal length f of the optical imaging lens group is 9.80mm, the total length TTL of the optical imaging lens group is 12.50mm, a half ImgH of the diagonal length of the effective pixel area on the imaging surface S21 of the optical imaging lens group is 8.16mm, a half Semi-FOV of the maximum field angle of the optical imaging lens group is 38.98 °, and the entrance pupil diameter EPD of the optical imaging lens group is 6.99 mm.

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
						S1	-3.2986E-04	-5.9502E-05	2.2396E-05	-5.4568E-06	7.3585E-07
S2	-2.1884E-03	-7.2610E-05	4.4288E-05	-1.0663E-05	1.3851E-06
						S3	-2.0816E-03	4.3808E-05	-4.3588E-05	1.8892E-05	-4.3102E-06
S4	8.9448E-03	-5.7439E-03	1.7860E-03	-3.3350E-04	3.9521E-05
						S5	1.4638E-02	-6.9881E-03	2.2231E-03	-4.6891E-04	6.7210E-05
S6	5.8940E-03	-1.8683E-03	5.5606E-04	-1.2022E-04	1.5557E-05
						S7	-9.0616E-03	1.3560E-03	-6.4112E-04	2.0786E-04	-4.8508E-05
S8	-6.9461E-03	1.1924E-03	-5.5834E-04	1.7283E-04	-3.8367E-05
						S9	-6.5759E-03	8.4015E-04	-4.0058E-04	1.1811E-04	-2.2744E-05
S10	-8.1912E-03	9.7399E-04	-2.6972E-04	4.5464E-05	-4.1349E-06
						S11	-1.1931E-02	2.1128E-03	-3.8082E-04	5.2500E-05	-6.1125E-06
S12	-1.3465E-02	1.8823E-03	-2.2642E-04	4.4576E-06	4.0771E-06
						S13	-4.4260E-03	3.0132E-04	1.9298E-05	-2.3680E-05	4.2899E-06
S14	-7.5484E-03	4.3860E-03	-1.0956E-03	1.4575E-04	-1.2001E-05
						S15	-1.1771E-02	4.4726E-03	-1.1141E-03	1.5823E-04	-1.3848E-05
S16	-4.5939E-03	9.1281E-04	-2.3057E-04	3.0909E-05	-2.4366E-06
						S17	-1.1613E-02	1.9909E-03	-2.6664E-04	2.2169E-05	-1.0959E-06
S18	-3.9019E-03	2.1826E-04	-5.5447E-07	-1.2591E-06	1.1227E-07

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 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. Fig. 4C shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 2. Fig. 4D shows a distortion curve of the optical imaging lens group of embodiment 2, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 4A to 4D, the optical imaging lens assembly of 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 6D. 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, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an image plane S21.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative 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 concave object-side surface S15 and a convex image-side surface S16. The ninth lens element E9 has negative power, and has a concave object-side surface S17 and a concave image-side surface S18. Filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the respective surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In the present example, the total effective focal length f of the optical imaging lens group is 9.78mm, the total length TTL of the optical imaging lens group is 12.50mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S21 of the optical imaging lens group is 8.16mm, the half Semi-FOV of the maximum field angle of the optical imaging lens group is 39.07 °, and the entrance pupil diameter EPD of the optical imaging lens group is 6.85 mm.

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

TABLE 6-1

Flour mark	A14	A16	A18	A20	A22
						S1	-1.5872E-07	1.1337E-08	-4.3056E-10	6.4759E-12	0.0000E+00
S2	-1.1394E-07	5.5139E-09	-1.5769E-10	2.0066E-12	0.0000E+00
						S3	2.8438E-07	-2.3983E-08	9.9733E-10	-1.6036E-11	0.0000E+00
S4	-1.7327E-06	8.8794E-08	-2.6724E-09	3.5776E-11	0.0000E+00
						S5	-4.0839E-06	2.7219E-07	-1.0389E-08	1.6965E-10	0.0000E+00
S6	7.2725E-08	-8.1691E-08	7.9245E-09	-2.4972E-10	0.0000E+00
						S7	6.1074E-06	-5.6592E-07	2.7813E-08	-5.6451E-10	0.0000E+00
S8	5.2751E-06	-4.7504E-07	2.2688E-08	-4.4577E-10	0.0000E+00
						S9	3.0673E-06	-2.2820E-07	9.0620E-09	-1.4519E-10	0.0000E+00
S10	9.7298E-07	-5.1922E-08	1.3871E-09	-1.2155E-11	0.0000E+00
						S11	1.1300E-06	-7.4500E-08	2.8731E-09	-4.7337E-11	0.0000E+00
S12	-1.9063E-06	1.7914E-07	-1.0077E-08	3.1749E-10	-4.2902E-12
						S13	-8.0827E-07	3.7024E-08	-8.9066E-10	8.7334E-12	0.0000E+00
S14	6.5672E-09	2.8461E-09	-1.1177E-10	1.3708E-12	0.0000E+00
						S15	3.8014E-07	-1.2633E-08	2.3129E-10	-1.7964E-12	0.0000E+00
S16	5.6506E-08	-1.6005E-09	2.4161E-11	-1.5061E-13	0.0000E+00
						S17	4.6668E-08	-8.8997E-10	9.4997E-12	-4.3697E-14	0.0000E+00
S18	-1.9302E-09	5.2088E-11	-6.5520E-13	3.2084E-15	0.0000E+00

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 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. Fig. 6C shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 3. Fig. 6D shows a distortion curve of the optical imaging lens group of embodiment 3, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 6A to 6D, 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 8D. 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, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an image plane S21.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative 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 concave 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. The ninth lens element E9 has negative power, and has a concave object-side surface S17 and a concave image-side surface S18. Filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the respective surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In the present example, the total effective focal length f of the optical imaging lens group is 10.42mm, the total length TTL of the optical imaging lens group is 12.50mm, a half ImgH of the diagonal length of the effective pixel area on the imaging surface S21 of the optical imaging lens group is 8.16mm, a half Semi-FOV of the maximum field angle of the optical imaging lens group is 37.23 °, and the entrance pupil diameter EPD of the optical imaging lens group is 6.97 mm.

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

TABLE 8-1

Flour mark	A14	A16	A18	A20	A22
						S1	-4.3719E-07	3.2731E-08	-1.2876E-09	2.0252E-11	0.0000E+00
S2	-3.1169E-07	2.5131E-08	-1.0968E-09	1.9328E-11	0.0000E+00
						S3	-1.5431E-07	1.4409E-08	-6.9851E-10	1.3460E-11	0.0000E+00
S4	-2.9764E-06	1.7761E-07	-6.0032E-09	8.7350E-11	0.0000E+00
						S5	-4.0443E-06	2.4897E-07	-8.4355E-09	1.1927E-10	0.0000E+00
S6	3.0569E-06	-3.8772E-07	2.5022E-08	-6.4567E-10	0.0000E+00
						S7	4.0849E-06	-3.3714E-07	1.4215E-08	-2.4242E-10	0.0000E+00
S8	2.8080E-06	-1.9306E-07	5.3466E-09	-1.1961E-11	0.0000E+00
						S9	2.9304E-06	-1.9322E-07	5.0330E-09	7.5406E-12	0.0000E+00
S10	1.1506E-06	-6.3400E-08	1.4653E-09	-1.0168E-12	0.0000E+00
						S11	3.9656E-06	-2.4680E-07	8.6712E-09	-1.2901E-10	0.0000E+00
S12	1.0098E-05	-7.7782E-07	3.7689E-08	-1.0276E-09	1.1930E-11
						S13	-5.2039E-08	2.4811E-09	-2.5603E-11	-3.3126E-13	0.0000E+00
S14	2.1416E-07	-8.2557E-09	1.7008E-10	-1.4501E-12	0.0000E+00
						S15	1.6578E-07	-6.0807E-09	1.1827E-10	-9.4074E-13	0.0000E+00
S16	4.2678E-08	-1.2453E-09	1.9163E-11	-1.2044E-13	0.0000E+00
						S17	4.4209E-08	-8.2430E-10	8.5449E-12	-3.7996E-14	0.0000E+00
S18	1.8251E-08	-2.9685E-10	2.6673E-12	-1.0194E-14	0.0000E+00

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 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. Fig. 8C shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 4. Fig. 8D shows a distortion curve of the optical imaging lens group of embodiment 4, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 8A to 8D, the optical imaging lens assembly 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 10D. 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, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an image plane S21.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative 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 concave 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. The ninth lens element E9 has negative power, and has a concave object-side surface S17 and a concave image-side surface S18. Filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the respective surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In the present example, the total effective focal length f of the optical imaging lens group is 9.22mm, the total length TTL of the optical imaging lens group is 11.50mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S21 of the optical imaging lens group is 7.50mm, the half Semi-FOV of the maximum field angle of the optical imaging lens group is 38.37 °, and the entrance pupil diameter EPD of the optical imaging lens group is 6.12 mm.

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

Flour mark	A4	A6	A8	A10	A12
						S1	-5.5743E-01	-1.1499E-01	-2.2522E-02	-3.1062E-02	-3.1650E-03
S2	-5.3091E-01	1.7886E-01	-3.0555E-02	-3.7785E-02	6.6031E-03
						S3	-2.0915E-01	2.5094E-01	-8.9117E-02	-4.4431E-02	1.9460E-02
S4	-1.4366E-01	8.0218E-02	-1.6797E-02	-1.5803E-02	1.8369E-02
						S5	6.5939E-01	7.2239E-03	3.7149E-02	-1.8985E-02	-4.4722E-03
S6	8.4871E-01	1.8088E-01	7.5679E-02	-4.2735E-03	-1.2184E-02
						S7	-7.8377E-01	1.4705E-01	-6.0657E-03	-4.0652E-02	-1.7876E-02
S8	-5.7609E-01	1.8932E-01	2.6806E-02	-1.8960E-02	-5.7556E-03
						S9	-6.7988E-01	4.4568E-02	1.1507E-02	-2.0221E-03	8.1122E-03
S10	-1.0408E+00	1.2030E-01	3.1554E-02	3.2829E-03	-1.1270E-03
						S11	-2.0433E+00	-5.3724E-02	6.4042E-02	-2.6153E-03	-6.4008E-02
S12	-2.2132E+00	2.8741E-01	-1.1401E-02	2.2190E-02	-3.3876E-02
						S13	-1.5586E+00	1.4958E-01	4.6496E-02	-3.4233E-02	5.2136E-03
S14	-5.0535E-01	-2.0607E-01	6.7602E-02	-4.9607E-02	8.0340E-03
						S15	-5.0535E-01	-2.0607E-01	6.7602E-02	-4.9607E-02	8.0340E-03
S16	-1.8609E+00	3.3803E-02	4.5809E-02	-2.6591E-02	-8.7819E-03
						S17	-5.9360E-01	5.4015E-01	-2.4245E-01	6.2822E-02	-8.8511E-03
S18	-4.0690E+00	1.1389E+00	-2.5323E-01	1.2800E-01	1.0284E-02

TABLE 10-1

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 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. Fig. 10C shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 5. Fig. 10D shows a distortion curve of the optical imaging lens group of embodiment 5, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 10A to 10D, the optical imaging lens assembly 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 12D. 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, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an image plane S21.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave 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 concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative 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 positive power, and has a concave object-side surface S15 and a convex image-side surface S16. The ninth lens element E9 has negative power, and has a concave object-side surface S17 and a concave image-side surface S18. Filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the respective surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In the present example, the total effective focal length f of the optical imaging lens group is 9.91mm, the total length TTL of the optical imaging lens group is 12.50mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S21 of the optical imaging lens group is 8.11mm, the half Semi-FOV of the maximum field angle of the optical imaging lens group is 38.45 °, and the entrance pupil diameter EPD of the optical imaging lens group is 7.64 mm.

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	A14	A16	A18	A20	A22
						S1	1.5799E-07	-1.0464E-08	3.7917E-10	-5.8242E-12	0.0000E+00
S2	8.6333E-08	-1.2163E-08	5.7260E-10	-9.6666E-12	0.0000E+00
						S3	6.1024E-07	-5.1997E-08	2.1433E-09	-3.4516E-11	0.0000E+00
S4	-1.2132E-06	7.4166E-08	-2.4882E-09	3.5148E-11	0.0000E+00
						S5	-2.8063E-06	1.9157E-07	-7.3251E-09	1.1845E-10	0.0000E+00
S6	-1.2071E-06	7.0024E-08	-1.9197E-09	1.2894E-11	0.0000E+00
						S7	1.5811E-07	-2.1868E-08	1.4453E-09	-3.8023E-11	0.0000E+00
S8	1.5773E-06	-1.4511E-07	7.2753E-09	-1.5572E-10	0.0000E+00
						S9	3.1944E-06	-2.1825E-07	7.8984E-09	-1.1677E-10	0.0000E+00
S10	-1.2906E-07	3.0256E-08	-2.0501E-09	4.9172E-11	0.0000E+00
						S11	2.1022E-06	-1.3550E-07	4.6995E-09	-6.7676E-11	0.0000E+00
S12	4.4776E-06	-3.0705E-07	1.2651E-08	-2.8345E-10	2.6165E-12
						S13	1.9286E-06	-9.5531E-08	2.5889E-09	-2.9511E-11	0.0000E+00
S14	9.7286E-07	-3.7069E-08	7.6116E-10	-6.5017E-12	0.0000E+00
						S15	6.9411E-07	-2.3403E-08	4.2644E-10	-3.2322E-12	0.0000E+00
S16	1.6569E-07	-4.6035E-09	6.8788E-11	-4.2542E-13	0.0000E+00
						S17	-2.0340E-08	5.4387E-10	-7.3767E-12	4.0378E-14	0.0000E+00
S18	-1.0694E-09	8.7242E-12	5.0074E-14	-8.9786E-16	0.0000E+00

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 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. Fig. 12C shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 6. Fig. 12D shows a distortion curve of the optical imaging lens group of embodiment 6, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 12A to 12D, 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 14D. 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, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an image plane S21.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave 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 concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative 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 concave object-side surface S15 and a convex image-side surface S16. The ninth lens element E9 has negative power, and has a concave object-side surface S17 and a concave image-side surface S18. Filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the respective surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In the present example, the total effective focal length f of the optical imaging lens group is 9.46mm, the total length TTL of the optical imaging lens group is 12.79mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S21 of the optical imaging lens group is 8.11mm, the half Semi-FOV of the maximum field angle of the optical imaging lens group is 39.71 °, and the entrance pupil diameter EPD of the optical imaging lens group is 7.90 mm.

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
						S1	-2.3934E-04	7.4893E-05	-4.0958E-05	1.0868E-05	-1.7420E-06
S2	-1.2717E-03	-1.3420E-04	1.6820E-05	-6.7439E-07	-2.0852E-07
						S3	-1.0687E-03	-3.4169E-04	9.1851E-05	-2.0473E-05	2.9975E-06
S4	3.1196E-03	-1.3400E-03	2.4810E-04	-2.4520E-05	1.0931E-06
						S5	8.3633E-03	-2.1925E-03	4.2443E-04	-5.6622E-05	5.5392E-06
S6	4.5782E-03	-8.6539E-04	1.0850E-04	9.3479E-06	-7.4998E-06
						S7	-6.0813E-03	3.1638E-04	-8.1040E-05	6.4470E-06	-6.5054E-07
S8	-3.9079E-03	4.3156E-04	-2.0098E-04	5.7243E-05	-1.2241E-05
						S9	-3.1321E-03	8.1055E-04	-4.2160E-04	1.1869E-04	-2.0658E-05
S10	-7.4313E-03	1.1031E-03	-2.5864E-04	3.4137E-05	-2.6635E-06
						S11	-1.5253E-02	3.5434E-03	-8.3538E-04	1.5348E-04	-2.1667E-05
S12	-1.6865E-02	3.8677E-03	-9.2723E-04	1.7765E-04	-2.5266E-05
						S13	-6.9846E-03	2.4565E-03	-7.9848E-04	1.5956E-04	-2.0389E-05
S14	-3.1759E-03	1.6995E-03	-5.1646E-04	8.3164E-05	-8.2840E-06
						S15	-7.8845E-03	1.3990E-03	-3.9639E-04	6.6542E-05	-6.4900E-06
S16	-3.6063E-03	4.4208E-04	-1.6661E-04	2.9182E-05	-2.7464E-06
						S17	1.0806E-03	-2.6729E-03	5.3478E-04	-5.6160E-05	3.5013E-06
S18	2.2287E-04	-9.8696E-04	1.4516E-04	-1.1272E-05	5.2456E-07

TABLE 14-1

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 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. Fig. 14C shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 7. Fig. 14D shows a distortion curve of the optical imaging lens group of embodiment 7, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 14A to 14D, 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 16D. 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, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an image plane S21.

In the present example, the total effective focal length f of the optical imaging lens group is 9.41mm, the total length TTL of the optical imaging lens group is 11.70mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S21 of the optical imaging lens group is 7.90mm, the half Semi-FOV of the maximum field angle of the optical imaging lens group is 39.90 °, and the entrance pupil diameter EPD of the optical imaging lens group is 6.28 mm.

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

TABLE 16-1

Flour mark	A14	A16	A18	A20	A22
						S1	1.7996E-02	1.4404E-02	4.6030E-03	4.9797E-04	0.0000E+00
S2	1.5429E-02	7.6994E-03	1.3645E-03	8.9995E-05	0.0000E+00
						S3	1.4038E-02	3.6285E-03	-1.0609E-04	-2.1514E-04	0.0000E+00
S4	1.0939E-02	5.4042E-03	1.3391E-03	7.9428E-04	0.0000E+00
						S5	-4.4735E-03	-3.4202E-03	-1.0675E-03	4.3700E-04	0.0000E+00
S6	-6.0272E-03	-2.6569E-03	-9.2307E-04	-1.2534E-04	0.0000E+00
						S7	-1.9909E-03	-1.1967E-03	-1.4110E-03	-7.3728E-04	0.0000E+00
S8	5.3501E-03	3.4495E-03	6.2903E-04	-3.1107E-04	0.0000E+00
						S9	1.0076E-02	3.1251E-03	-9.0937E-04	-9.5110E-04	0.0000E+00
S10	1.5139E-03	-8.1453E-04	-1.1103E-03	-8.5974E-04	0.0000E+00
						S11	-3.5884E-02	-2.0799E-02	-5.2290E-03	-1.1044E-03	0.0000E+00
S12	5.7448E-03	-5.1026E-03	8.9787E-04	8.7965E-04	4.4335E-04
						S13	5.8274E-03	6.6377E-06	-1.4747E-03	3.0310E-04	0.0000E+00
S14	3.7437E-04	1.7996E-03	2.6596E-05	-1.8583E-04	0.0000E+00
						S15	1.8862E-02	1.7160E-03	-3.8179E-03	-1.4118E-03	0.0000E+00
S16	1.9196E-03	1.3908E-03	6.5240E-04	-3.4077E-04	0.0000E+00
						S17	-1.5786E-03	-1.8269E-02	5.8556E-03	1.2289E-03	0.0000E+00
S18	3.2822E-03	-1.4907E-02	2.3211E-02	1.1688E-02	0.0000E+00

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 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. Fig. 16C shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 8. Fig. 16D shows a distortion curve of the optical imaging lens group of embodiment 8, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 16A to 16D, the optical imaging lens assembly according to embodiment 8 can achieve good imaging quality.

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

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 comprises, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens having optical power,

the second lens has positive optical power;

the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface;

half of diagonal length ImgH of an effective pixel area on an imaging surface of the optical imaging lens group, total effective focal length F of the optical imaging lens group, and F-number Fno of the optical imaging lens group satisfy: 1 < ImgH/f × Fno < 1.3; and

the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 0.2 < | f2+ f3|/f < 0.5.

2. The optical imaging lens group of claim 1, wherein a center thickness CT8 of the eighth lens on the optical axis, a center thickness CT9 of the ninth lens on the optical axis, and an air space T89 of the eighth lens and the ninth lens on the optical axis satisfy: 0.6 < (CT8+ CT9)/T89 < 1.3.

3. The optical imaging lens group of claim 1 wherein the effective focal length f1 of the first lens and the combined focal length f12 of the first and second lenses satisfy: 1 < (f1-f2)/f12 < 3.

4. The optical imaging lens group of claim 1 wherein the effective focal length f9 of the ninth lens and the combined focal length f89 of the eighth lens and the ninth lens satisfy: f9/f89 is more than 0.9 and less than 1.2.

5. The optical imaging lens group of claim 1 wherein the center thickness CT1 of the first lens in the optical axis, the center thickness CT2 of the second lens in the optical axis, the edge thickness ET1 of the first lens, and the edge thickness ET2 of the second lens satisfy: 0.6 < (CT1-ET1)/(CT2-ET2) < 1.4.

6. The optical imaging lens group of claim 1 wherein a center thickness CT9 of the ninth lens on the optical axis and an edge thickness ET9 of the ninth lens satisfy: CT9/ET9 < 1.

7. The optical imaging lens group of claim 1, wherein the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT92 of the image side surface of the ninth lens satisfy: 0.4 < DT11/DT92 < 0.6.

8. The optical imaging lens group of claim 1, wherein the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT52 of the image side surface of the fifth lens satisfy: 0.9 < DT11/DT52 < 1.1.

9. The optical imaging lens group of claim 1, wherein the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: l (R1-R2)/(R1+ R2) | < 0.3.

10. The optical imaging lens assembly comprises, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens having optical power,

the second lens has positive optical power;

the abbe number V3 of the third lens, the abbe number V4 of the fourth lens, the abbe number V8 of the eighth lens, and the abbe number V9 of the ninth lens satisfy: 1 < (V3+ V4+ V8)/V9 < 1.1.