CN111427134A - Optical imaging lens group - Google Patents

Abstract

The application discloses an optical imaging lens group, which sequentially comprises 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 from an object side to an image side along an optical axis, wherein the fourth lens has negative focal power, the image side surface of the fourth lens is a concave surface, the image side surface of the fifth lens is a convex surface, the eighth lens has positive focal power, and the distance TT L from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis, half of diagonal length ImgH of an effective pixel area of the optical imaging lens group and the F number Fno of the optical imaging lens group satisfy Fno × TT L/Imgh < 2.5.

Description

Optical imaging lens group

technical field

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

Background technique

In recent years, with the rapid development of portable electronic products such as smart phones, the competition among brands of portable electronic products such as smart phones has obviously entered a fever pitch. In order to enhance the attractiveness of their products, major brands have spared no effort to invest a lot of time and money in product innovation. The camera function is one of the core functions of portable electronic products such as smartphones, and the development trend of cameras towards the characteristics of high pixels, large aperture and large image area is becoming more and more obvious. Therefore, major brands urgently need to design lenses for portable electronic products such as smartphones with higher image quality, larger aperture and larger image area to adapt to the development of the market.

In theory, various aberrations can be balanced by increasing the number of lenses in the lens, greatly improving the imaging quality of the lens and obtaining a larger aperture and image surface. However, if the number of lenses of the lens is increased without limitation, the size of the lens will undoubtedly increase, which is contrary to the continuous pursuit of ultra-thinning of portable electronic products such as smartphones.

Therefore, how to design a lens with higher imaging quality and matching higher pixel sensors and stronger image processing technology while the lens size remains the same or even smaller has become an urgent problem for major brands to solve. one.

SUMMARY OF THE INVENTION

One aspect of the present application provides such an optical imaging lens group, the optical imaging lens group sequentially includes from the object side to the image side along the optical axis: a first lens having optical power, 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. The fourth lens has negative refractive power, and its image side is concave; the image side of the fifth lens is convex; the eighth lens has positive refractive power; and the object side of the first lens to the imaging surface of the optical imaging lens group is on the optical axis. The upper distance TTL, half the diagonal length of the effective pixel area of the optical imaging lens group ImgH, and the F number Fno of the optical imaging lens group can satisfy: Fno×TTL/ImgH<2.5.

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

In one embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens may satisfy: -2<f5/f6<-1.2.

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 may satisfy: f4/f<-1.

In one embodiment, the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R10 of the image side surface of the fifth lens may satisfy: -2<(R8-R10)/(R8+R10)<-1.

In one embodiment, the image side surface of the eighth lens is concave, and the curvature radius R16 of the image side surface of the eighth lens and the effective focal length f8 of the eighth lens may satisfy: 0<R16/f8<0.5.

In one embodiment, the combined focal length f56 of the fifth lens and the sixth lens and the total effective focal length f of the optical imaging lens group may satisfy: f56/f<-5.

In one embodiment, the combined focal length f78 of the seventh lens and the eighth lens and the total effective focal length f of the optical imaging lens group may satisfy: 0.9<f78/f<1.5.

In one embodiment, the center thickness CT4 of the fourth lens on the optical axis and the separation distance T45 of the fourth lens and the fifth lens on the optical axis may satisfy: 0.3<CT4/T45<0.8.

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: 0.7<CT7/CT8<1.2.

In one embodiment, the central thickness CT6 of the sixth lens on the optical axis, 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: 0.5<CT6×2/ (CT7+CT8)<1.

In one embodiment, the separation distance T23 between the second lens and the third lens on the optical axis, the separation distance T34 between the third lens and the fourth lens on the optical axis, and the image from the object side of the second lens to the fourth lens The distance Tr3r8 of the side surface on the optical axis can satisfy: 0<10×(T23+T34)/Tr3r8<1.

In one embodiment, the center thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens may satisfy: 0.2<CT4/ET4<0.8.

In one embodiment, the central thickness CT5 of the fifth lens on the optical axis and the edge thickness ET5 of the fifth lens may satisfy: 2<CT5/ET5<4.

In one embodiment, the separation distance SAG42 on the optical axis from the intersection of the image side surface of the fourth lens and the optical axis to the effective radius vertex of the image side surface of the fourth lens and the center thickness CT4 of the fourth lens on the optical axis can satisfy: 1<SAG42/CT4<2.

In one embodiment, the maximum effective radius DT11 of the object side of the first lens and the maximum effective radius DT21 of the object side of the second lens may satisfy: 1<DT11/DT21<1.5.

Another aspect of the present application provides an optical imaging lens group, the optical imaging lens group sequentially includes from an object side to an image side along an optical axis: a first lens having optical power, 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. The fourth lens has negative refractive power, and its image side is concave; the image side of the fifth lens is convex; the eighth lens has positive refractive power; The separation distance T34 between the three lenses and the fourth lens on the optical axis and the distance Tr3r8 from the object side of the second lens to the image side of the fourth lens on the optical axis can satisfy: 0<10×(T23+T34)/Tr3r8< 1.

The present application provides an optical imaging lens group with ultra-thin and good imaging quality, which can be applied to portable electronic products by reasonably allocating optical power and optimizing optical parameters.

Description of drawings

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

1 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 1 of the present application;

2A to 2D respectively show the on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens group of Embodiment 1;

FIG. 3 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 2 of the present application;

4A to 4D respectively show the on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens group of Embodiment 2;

FIG. 5 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 3 of the present application;

6A to 6D respectively show the on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens group of Embodiment 3;

FIG. 7 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 4 of the present application;

8A to 8D respectively show the on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens group of Embodiment 4;

FIG. 9 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 5 of the present application;

10A to 10D respectively show the on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens group of Embodiment 5;

11 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 6 of the present application;

12A to 12D respectively show the on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens group of Embodiment 6;

FIG. 13 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 7 of the present application;

14A to 14D respectively show the on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens group of Example 7;

FIG. 15 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 8 of the present application; and

16A to 16D respectively show the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens group of Embodiment 8.

Detailed ways

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. 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 only used to distinguish one feature from another feature and do not imply any limitation on the feature. Accordingly, the first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

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

Herein, the paraxial region refers to the 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 at least in the paraxial region. Concave. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens.

It will also be understood that the terms "comprising", "comprising", "having", "comprising" and/or "comprising" when used in this specification mean that the stated features, elements and/or components are present , but does not preclude the presence or addition of one or more other features, elements, components and/or combinations thereof. Furthermore, when an expression such as "at least one of" appears after a list of listed features, it modifies the entire listed feature and not the individual elements of the list. Furthermore, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application." Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted to have meanings consistent with their meanings in the context of the related art, and will not be interpreted in an idealized or overly formal sense unless It is expressly so limited herein.

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

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

The optical imaging lens group according to the exemplary embodiment of the present application may include nine lenses with optical power, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a Seven lenses, eighth lenses, and ninth lenses. The nine lenses are arranged in sequence from the object side to the image side along the optical axis. Any two adjacent lenses among the first lens to the ninth lens may have a separation distance.

In an exemplary embodiment, the first lens may have positive power or negative power; the second lens may have positive power or negative power; the third lens may have positive power or negative power; The fourth lens may have negative power, and its image side may be concave; the fifth lens may have positive or negative power, and its image side may be convex; the sixth lens may have positive or negative power the seventh lens may have positive power or negative power; the eighth lens may have positive power; and the ninth lens may have positive power or negative power.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: Fno×TTL/ImgH<2.5, where TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical imaging lens group, ImgH is half the diagonal length of the effective pixel area of the optical imaging lens group, and Fno is the F-number of the optical imaging lens group. Satisfying Fno×TTL/ImgH<2.5 can effectively reduce the overall size of the optical imaging lens group while obtaining a larger image surface, and obtain a larger aperture, which is conducive to realizing the ultra-thin, large aperture and Large image surface and other characteristics.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: -2<f5/f6<-1.2, where f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. More specifically, f5 and f6 may further satisfy: -1.6<f5/f6<-1.2. Satisfying -2<f5/f6<-1.2, the aberration of the entire system can be effectively reduced, the sensitivity of the system can be reduced, and the manufacturability loss caused by the excessive power difference between the fifth lens and the sixth lens can be avoided.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: f4/f<-1, where 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 may further satisfy: -10<f4/f<-1. Satisfying f4/f<-1, the aberration of the entire system can be effectively reduced, and at the same time, the influence on the process performance of the fourth lens caused by the excessive concentration of the optical power on the fourth lens can be avoided.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: -2<(R8-R10)/(R8+R10)<-1, where R8 is the curvature radius of the image side surface of the fourth lens, R10 is the radius of curvature of the image side surface of the fifth lens. More specifically, R8 and R10 may further satisfy: -2<(R8-R10)/(R8+R10)<-1.2. Satisfying -2<(R8-R10)/(R8+R10)<-1, it can effectively correct the chromatic aberration of the optical imaging lens group, achieve the balance of various aberrations, and can effectively reduce the size of the optical imaging lens group, The optical power of the optical imaging lens group is reasonably distributed.

In an exemplary embodiment, the image side surface of the eighth lens may be concave. And the optical imaging lens group according to the present application can satisfy: 0<R16/f8<0.5, where R16 is the curvature radius of the image side surface of the eighth lens, and f8 is the effective focal length of the eighth lens. More specifically, R16 and f8 may further satisfy: 0.2<R16/f8<0.5. The image side surface of the eighth lens is concave and satisfies 0<R16/f8<0.5, so that the astigmatism and coma of the eighth lens can be controlled within a reasonable range, and the astigmatism and coma left by the front lens can be effectively balanced. Therefore, the lens group has better imaging quality, and the manufacturability of the eighth lens image can be guaranteed.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: f56/f<-5, where f56 is the combined focal length of the fifth lens and the sixth lens, and f is the total effective focal length of the optical imaging lens group . More specifically, f56 and f may further satisfy: f56/f<-5.2. Satisfying f56/f<-5, and with other lenses, it can further enhance the correction of high-order composite aberrations on the basis of reducing spherical aberration, coma, field curvature and other third-order aberrations; in addition, this structure can also Increase the aperture, enhance the light throughput of the optical system, improve the brightness of the image surface, and improve the image quality.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: 0.9<f78/f<1.5, where f78 is the combined focal length of the seventh lens and the eighth lens, and f is the total effective of the optical imaging lens group focal length. More specifically, f78 and f may further satisfy: 1<f78/f<1.3. Satisfying 0.9<f78/f<1.5, the lens group can keep the ultra-thin characteristics, and can effectively avoid excessive concentration of the system optical power on the seventh lens and the eighth lens, and cooperate with the fifth lens and the sixth lens. By combining the focal lengths, the system aberrations can be better corrected and the aberrations can be effectively balanced.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: 0.3<CT4/T45<0.8, wherein CT4 is the center thickness of the fourth lens on the optical axis, and T45 is the fourth lens and the fifth lens The separation distance on the optical axis. More specifically, CT4 and T45 may further satisfy: 0.4<CT4/T45<0.8. Satisfying 0.3<CT4/T45<0.8 is conducive to the ultra-thinning of the system, making the distribution of the fourth lens and the fifth lens more reasonable, reducing the risk of ghost images caused by the image side of the fourth lens, and avoiding the Difficulties in processing due to too thin lenses.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: 0.7<CT7/CT8<1.2, where CT7 is the center thickness of the seventh lens on the optical axis, and CT8 is the eighth lens on the optical axis the center thickness. Satisfying 0.7<CT7/CT8<1.2 can make the optical imaging lens group better balance the aberrations of the optical imaging lens group, and can effectively avoid the problem of difficult processing due to the thin seventh lens and the eighth lens, And the size of the optical imaging lens group can be reduced to keep it ultra-thin.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: 0.5<CT6×2/(CT7+CT8)<1, where CT6 is the center thickness of the sixth lens on the optical axis, and CT7 is the first The central thickness of the seventh lens on the optical axis, CT8 is the central thickness of the eighth lens on the optical axis. Satisfying 0.5<CT6×2/(CT7+CT8)<1, it can effectively avoid the problem of difficult processing technology caused by the sixth lens, seventh lens and eighth lens being too thin, and can reduce the size of the optical imaging lens group, It keeps the ultra-thin characteristics, and at the same time, the optical imaging lens group can better balance the aberrations of the optical imaging lens group.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: 0<10×(T23+T34)/Tr3r8<1, where T23 is the separation distance between the second lens and the third lens on the optical axis , T34 is the separation distance between the third lens and the fourth lens on the optical axis, Tr3r8 is the distance on the optical axis from the object side of the second lens to the image side of the fourth lens. More specifically, T23, T34 and Tr3r8 may further satisfy: 0.4<10×(T23+T34)/Tr3r8<1. Satisfying 0<10×(T23+T34)/Tr3r8<1, the ghost image risk brought by the second lens and the third lens, as well as the third lens and the fourth lens can be effectively reduced; The structure between the lens and the fourth lens is more compact, which is beneficial to reduce the size of the system, making it easier for the optical imaging lens group to maintain the ultra-thin characteristics.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: 0.2<CT4/ET4<0.8, wherein CT4 is the center thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens. More specifically, CT4 and ET4 may further satisfy: 0.3<CT4/ET4<0.7. Satisfying 0.2<CT4/ET4<0.8 can reduce the system size and maintain good workability while balancing the influence of system distortion.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: 2<CT5/ET5<4, where CT5 is the center thickness of the fifth lens on the optical axis, and ET5 is the edge thickness of the fifth lens. More specifically, CT5 and ET5 can further satisfy: 2.2<CT5/ET5<3.4. Satisfying 2<CT5/ET5<4 can reduce the system size and maintain good processability while balancing the influence of system distortion.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: 1<SAG42/CT4<2, where SAG42 is the effective radius from the intersection of the image side surface and the optical axis of the fourth lens to the image side surface of the fourth lens The distance between the vertices on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis. More specifically, SAG42 and CT4 can further satisfy: 1.1<SAG42/CT4<1.7. Satisfying 1<SAG42/CT4<2, the light can have a certain divergence function when passing through the image side of the fourth lens, which helps to obtain a larger image surface on the premise of ensuring the image quality of the system; Satisfying SAG42/CT4<2 , can avoid process problems such as processing difficulties caused by excessive SAG42.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy: 1<DT11/DT21<1.5, wherein DT11 is the maximum effective radius of the object side of the first lens, and DT21 is the maximum effective radius of the object side of the second lens. Maximum effective radius. More specifically, DT11 and DT21 may further satisfy: 1<DT11/DT21<1.3. Satisfying 1<DT11/DT21<1.5, it can effectively increase the light throughput of the optical imaging lens group to improve the relative illuminance of the system, especially the edge field of view, so that the system still has good imaging quality in a dark environment; It helps to improve the processability of the first lens and the second lens, so that the optical imaging lens group has higher practicability.

In an exemplary embodiment, the optical imaging lens group according to the present application further includes a diaphragm disposed between the first lens and the second lens or the second lens and the third lens. Optionally, the above-mentioned optical imaging lens group may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface. The present application proposes an optical imaging lens group with characteristics such as miniaturization, large image surface, large aperture, ultra-thinness, and high imaging quality. The optical imaging lens set according to the above-mentioned embodiments of the present application may employ multiple lenses, such as the above nine lenses. By rationally distributing the focal power, surface shape, central thickness of each lens, and on-axis distance between each lens, etc., the incident light can be effectively converged, the overall optical length of the imaging lens can be reduced, and the machinability of the imaging lens can be improved. , making the optical imaging lens group more conducive to production and processing.

In the embodiments of the present application, at least one of the mirror surfaces of each lens is an aspheric mirror surface, that is, at least one mirror surface from the object side of the first lens to the image side of the ninth lens is an aspheric mirror surface. The characteristic of aspheric lenses is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike spherical lenses, which have a constant curvature from the center of the lens to the periphery of the lens, aspheric lenses have better curvature radius characteristics, and have the advantages of improving distortion and astigmatism. After the aspherical lens is used, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side and the image side 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 At least one of them is an aspherical mirror surface. Optionally, the object side and the image side 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 All are aspherical mirrors.

However, those skilled in the art should understand that the number of lenses constituting the optical imaging lens group can be changed to obtain the various results and advantages described in this specification without departing from the technical solutions claimed in the present application. For example, although nine lenses are described as an example in the embodiment, the optical imaging lens group is not limited to including nine lenses. The optical imaging lens set 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 accompanying drawings.

Example 1

The following describes the optical imaging lens group according to Embodiment 1 of the present application with reference to FIGS. 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 group sequentially includes from the object side to the image side: a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a Six lenses E6, seventh lens E7, eighth lens E8, ninth lens E9, filter E10 and imaging surface S21.

The first lens E1 has positive refractive power, the object side S1 is convex, and the image side S2 is concave. The second lens E2 has positive refractive power, the object side S3 is convex, and the image side S4 is convex. The third lens E3 has positive refractive power, the object side S5 is convex, and the image side S6 is convex. The fourth lens E4 has negative refractive power, the object side S7 is convex, and the image side S8 is concave. The fifth lens E5 has positive refractive power, the object side S9 is convex, and the image side S10 is convex. The sixth lens E6 has negative refractive power, the object side S11 is concave, and the image side S12 is convex. The seventh lens E7 has positive refractive power, the object side S13 is convex, and the image side S14 is concave. The eighth lens E8 has positive refractive power, the object side S15 is convex, and the image side S16 is concave. The ninth lens E9 has negative refractive power, the object side S17 is convex, and the image side S18 is concave. The filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the surfaces S1 to S20 and is finally imaged on the imaging surface S21.

Table 1 shows the basic parameter table of the optical imaging lens group of Example 1, wherein the units of curvature radius, 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 5.66 mm, and the total length TTL of the optical imaging lens group (that is, from the object side S1 of the first lens E1 to the imaging surface S21 of the optical imaging lens group is on the optical axis The distance from above) is 7.60mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S21 of the optical imaging lens group is 5.80mm, the maximum field of view FOV of the optical imaging lens group is 89.5°, and the optical imaging lens group The F-number Fno is 1.70.

In Embodiment 1, the object side and the image side of any one of the first lens E1 to the ninth lens E9 are aspherical, and the surface type x of each aspherical lens can be defined by, but not limited to, the following aspherical formula :

Among them, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is the above table 1 is the reciprocal of the radius of curvature R); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the higher order coefficients A ₄ , A ₆ , A ₈ , A ₁₀ , A ₁₂ , A ₁₄ , A ₁₆ , A ₁₈ and A ₂₀ that can be used for each of the aspheric mirror surfaces S1-S18 in Example 1 .

face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.6632E-02 -2.2749E-03 8.3243E-04 -6.7474E-04 6.3481E-04 -3.0314E-04 9.2435E-05 -1.6306E-05 1.2201E-06 S2 -2.6665E-02 4.5783E-04 -7.7423E-04 4.8047E-03 -4.6048E-03 2.4293E-03 -7.4801E-04 1.2550E-04 -8.7700E-06 S3 -1.2470E-02 -3.4257E-03 1.8309E-03 -1.9505E-03 1.9423E-03 -1.2920E-03 4.6268E-04 -7.7172E-05 4.5872E-06 S4 -6.4394E-03 1.5306E-02 -4.8823E-02 5.1171E-02 -3.2150E-02 1.3631E-02 -3.8295E-03 6.4265E-04 -4.8257E-05 S5 -1.4615E-02 1.9671E-02 -4.0046E-02 3.6417E-02 -1.8602E-02 6.2779E-03 -1.4771E-03 2.2359E-04 -1.6110E-05 S6 1.1883E-02 -3.3862E-02 2.9699E-02 -1.8914E-02 8.1718E-03 -2.1968E-03 2.9648E-04 -3.0469E-06 -2.5483E-06 S7 -1.0311E-03 -2.8340E-02 2.2243E-02 -1.1834E-02 4.1904E-03 -9.6141E-04 1.6480E-04 -2.1489E-05 1.4137E-06 S8 -2.5793E-02 9.0760E-03 -1.0312E-02 9.7805E-03 -6.0041E-03 2.3620E-03 -5.6595E-04 7.5307E-05 -4.2709E-06 S9 -1.3221E-02 5.5884E-03 -5.2299E-03 3.7727E-03 -2.1211E-03 9.0217E-04 -2.6631E-04 4.4976E-05 -3.1368E-06 S10 -3.4751E-02 2.1975E-02 -1.8969E-02 1.2824E-02 -6.5918E-03 2.3044E-03 -5.0083E-04 6.0270E-05 -3.0352E-06 S11 -5.3013E-02 3.4195E-02 -1.0920E-02 2.3087E-03 -8.1684E-04 3.3867E-04 -7.5958E-05 8.1181E-06 -3.3374E-07 S12 -7.4286E-02 4.3504E-02 -2.2060E-02 1.0271E-02 -3.7362E-03 9.1453E-04 -1.3562E-04 1.0905E-05 -3.6456E-07 S13 -3.2162E-02 3.8023E-02 -2.8232E-02 1.2038E-02 -3.2558E-03 5.5841E-04 -5.9009E-05 3.5101E-06 -8.9779E-08 S14 -8.5700E-03 2.2534E-02 -1.7086E-02 6.5592E-03 -1.5407E-03 2.2378E-04 -1.9395E-05 9.1678E-07 -1.8192E-08 S15 1.6438E-02 -2.2029E-02 7.0038E-03 -1.4236E-03 1.5898E-04 -7.1529E-06 -1.6221E-07 2.5910E-08 -6.4846E-10 S16 4.8015E-02 -3.6268E-02 1.1809E-02 -2.5740E-03 3.6733E-04 -3.3334E-05 1.8419E-06 -5.6146E-08 7.1913E-10 S17 -8.9327E-02 8.3184E-03 5.0989E-04 -2.2730E-04 3.0513E-05 -2.3139E-06 1.0312E-07 -2.5046E-09 2.5556E-11 S18 -1.0944E-01 2.5640E-02 -4.6949E-03 6.0279E-04 -5.1909E-05 2.9330E-06 -1.0477E-07 2.1536E-09 -1.9438E-11

Table 2

FIG. 2A shows the on-axis chromatic aberration curve of the optical imaging lens group of Embodiment 1, which represents the deviation of the converging point of light of different wavelengths after passing through the lens. 2B shows astigmatism curves of the optical imaging lens group of Example 1, which represent the meridional curvature of the image plane and the sagittal image plane curvature. FIG. 2C shows a distortion curve of the optical imaging lens group of Example 1, which represents the distortion magnitude values corresponding to different image heights. FIG. 2D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to FIG. 2A to FIG. 2D , it can be seen that the optical imaging lens group given in Embodiment 1 can achieve good imaging quality.

Example 2

The following describes the optical imaging lens group according to Embodiment 2 of the present application with reference to FIGS. 3 to 4D . In this embodiment and the following embodiments, descriptions similar to those in Embodiment 1 will be omitted for the sake of brevity. FIG. 3 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 2 of the present application.

As shown in FIG. 3, the optical imaging lens group sequentially includes from the object side to the image side: a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a Six lenses E6, seventh lens E7, eighth lens E8, ninth lens E9, filter E10 and imaging surface S21.

The first lens E1 has positive refractive power, the object side S1 is convex, and the image side S2 is concave. The second lens E2 has positive refractive power, the object side S3 is convex, and the image side S4 is concave. The third lens E3 has negative refractive power, the object side S5 is convex, and the image side S6 is concave. The fourth lens E4 has negative refractive power, the object side S7 is convex, and the image side S8 is concave. The fifth lens E5 has positive refractive power, the object side S9 is convex, and the image side S10 is convex. The sixth lens E6 has negative refractive power, the object side S11 is concave, and the image side S12 is concave. The seventh lens E7 has positive refractive power, the object side S13 is convex, and the image side S14 is concave. The eighth lens E8 has positive refractive power, the object side S15 is convex, and the image side S16 is concave. The ninth lens E9 has negative refractive power, the object side S17 is convex, and the image side S18 is concave. The filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In this example, the total effective focal length f of the optical imaging lens group is 5.57mm, the total length TTL of the optical imaging lens group is 7.55mm, and the half of the diagonal length of the effective pixel area on the imaging plane S21 of the optical imaging lens group is ImgH It is 5.60mm, the maximum field of view FOV of the optical imaging lens group is 88.4°, and the F number Fno of the optical imaging lens group is 1.71.

Table 3 shows the basic parameter table of the optical imaging lens group of Example 2, wherein the units of curvature radius, thickness/distance and focal length are all millimeters (mm). Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in Example 2, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

table 3

Table 4

FIG. 4A shows the on-axis chromatic aberration curve of the optical imaging lens group of Embodiment 2, which represents the deviation of the confocal point of light of different wavelengths after passing through the lens. 4B shows astigmatism curves of the optical imaging lens group of Example 2, which represent the meridional curvature of the image plane and the sagittal image plane curvature. FIG. 4C shows the distortion curve of the optical imaging lens group of Example 2, which represents the distortion magnitude values corresponding to different image heights. FIG. 4D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to FIGS. 4A to 4D , it can be seen that the optical imaging lens group given in Embodiment 2 can achieve good imaging quality.

Example 3

The optical imaging lens group according to Embodiment 3 of the present application is described below with reference to FIGS. 5 to 6D . FIG. 5 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 3 of the present application.

As shown in FIG. 5 , the optical imaging lens group sequentially includes from the object side to the image side: a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a Six lenses E6, seventh lens E7, eighth lens E8, ninth lens E9, filter E10 and imaging surface S21.

The first lens E1 has positive refractive power, the object side S1 is convex, and the image side S2 is concave. The second lens E2 has positive refractive power, the object side S3 is convex, and the image side S4 is concave. The third lens E3 has negative refractive power, the object side S5 is convex, and the image side S6 is concave. The fourth lens E4 has negative refractive power, the object side S7 is convex, and the image side S8 is concave. The fifth lens E5 has positive refractive power, the object side S9 is convex, and the image side S10 is convex. The sixth lens E6 has negative refractive power, the object side S11 is concave, and the image side S12 is concave. The seventh lens E7 has positive refractive power, the object side S13 is convex, and the image side S14 is concave. The eighth lens E8 has positive refractive power, the object side S15 is convex, and the image side S16 is concave. The ninth lens E9 has negative refractive power, the object side S17 is concave, and the image side S18 is concave. The filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In this example, the total effective focal length f of the optical imaging lens group is 5.88mm, the total length TTL of the optical imaging lens group is 7.60mm, and the half of the diagonal length of the effective pixel area on the imaging plane S21 of the optical imaging lens group is ImgH It is 5.60mm, the maximum field of view FOV of the optical imaging lens group is 87.4°, and the F number Fno of the optical imaging lens group is 1.75.

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

table 5

Table 6

FIG. 6A shows the on-axis chromatic aberration curve of the optical imaging lens group of Embodiment 3, which represents the deviation of the confocal point of light of different wavelengths after passing through the lens. 6B shows astigmatism curves of the optical imaging lens group of Example 3, which represent the meridional curvature of the image plane and the sagittal image plane curvature. FIG. 6C shows the distortion curve of the optical imaging lens group of Example 3, which represents the distortion magnitude values corresponding to different image heights. FIG. 6D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to FIG. 6A to FIG. 6D , it can be seen that the optical imaging lens group given in Embodiment 3 can achieve good imaging quality.

Example 4

The optical imaging lens group according to Embodiment 4 of the present application is described below with reference to FIGS. 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 group sequentially includes from the object side to the image side: a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a Six lenses E6, seventh lens E7, eighth lens E8, ninth lens E9, filter E10 and imaging surface S21.

The first lens E1 has positive refractive power, the object side S1 is convex, and the image side S2 is convex. The second lens E2 has negative refractive power, the object side S3 is convex, and the image side S4 is concave. The third lens E3 has positive refractive power, the object side S5 is convex, and the image side S6 is convex. The fourth lens E4 has negative refractive power, the object side S7 is convex, and the image side S8 is concave. The fifth lens E5 has positive refractive power, the object side S9 is convex, and the image side S10 is convex. The sixth lens E6 has negative refractive power, the object side S11 is concave, and the image side S12 is concave. The seventh lens E7 has positive refractive power, the object side S13 is convex, and the image side S14 is concave. The eighth lens E8 has positive refractive power, the object side S15 is convex, and the image side S16 is concave. The ninth lens E9 has negative refractive power, the object side S17 is convex, and the image side S18 is concave. The filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In this example, the total effective focal length f of the optical imaging lens group is 5.60mm, the total length TTL of the optical imaging lens group is 7.50mm, and the half of the diagonal length of the effective pixel area on the imaging plane S21 of the optical imaging lens group is ImgH It is 5.55mm, the maximum field of view FOV of the optical imaging lens group is 84.2°, and the F number Fno of the optical imaging lens group is 1.72.

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

Table 7

Table 8

FIG. 8A shows the on-axis chromatic aberration curve of the optical imaging lens group of Embodiment 4, which represents the deviation of the confocal point of light of different wavelengths after passing through the lens. 8B shows astigmatism curves of the optical imaging lens group of Example 4, which represent the meridional curvature of the field and the sagittal curvature of the field. FIG. 8C shows the distortion curve of the optical imaging lens group of Example 4, which represents the distortion magnitude values corresponding to different image heights. FIG. 8D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to FIGS. 8A to 8D , it can be seen that the optical imaging lens group provided in Embodiment 4 can achieve good imaging quality.

Example 5

The optical imaging lens group according to Embodiment 5 of the present application is described below with reference to FIGS. 9 to 10D . FIG. 9 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 5 of the present application.

As shown in FIG. 9 , the optical imaging lens group sequentially includes from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a Six lenses E6, seventh lens E7, eighth lens E8, ninth lens E9, filter E10 and imaging surface S21.

The first lens E1 has positive refractive power, the object side S1 is convex, and the image side S2 is concave. The second lens E2 has positive refractive power, the object side S3 is convex, and the image side S4 is concave. The third lens E3 has positive refractive power, the object side S5 is convex, and the image side S6 is convex. The fourth lens E4 has negative refractive power, the object side S7 is convex, and the image side S8 is concave. The fifth lens E5 has positive refractive power, the object side S9 is convex, and the image side S10 is convex. The sixth lens E6 has negative refractive power, the object side S11 is concave, and the image side S12 is convex. The seventh lens E7 has positive refractive power, the object side S13 is convex, and the image side S14 is concave. The eighth lens E8 has positive refractive power, the object side S15 is convex, and the image side S16 is concave. The ninth lens E9 has negative refractive power, the object side S17 is convex, and the image side S18 is concave. The filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In this example, the total effective focal length f of the optical imaging lens group is 6.00mm, the total length TTL of the optical imaging lens group is 7.80mm, and the half of the diagonal length of the effective pixel area on the imaging plane S21 of the optical imaging lens group is ImgH It is 5.60mm, the maximum field of view FOV of the optical imaging lens group is 84.7°, and the F number Fno of the optical imaging lens group is 1.69.

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

Table 9

face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.1343E-02 2.8218E-04 -2.4265E-03 2.6407E-03 -1.5618E-03 5.8670E-04 -1.3309E-04 1.6386E-05 -8.3196E-07 S2 -2.8564E-02 -4.0076E-03 1.0547E-02 -7.3097E-03 3.7487E-03 -1.4053E-03 3.4821E-04 -5.0455E-05 3.2631E-06 S3 -1.9817E-02 -2.5337E-03 2.8837E-03 1.8249E-03 -3.0338E-03 1.6161E-03 -4.8881E-04 8.4598E-05 -6.2544E-06 S4 -8.6889E-03 -4.1080E-03 -7.4073E-03 1.2840E-02 -8.6535E-03 3.2916E-03 -7.6380E-04 1.0515E-04 -6.6206E-06 S5 -2.5495E-03 -3.9477E-07 -1.4482E-02 1.9324E-02 -1.1583E-02 4.0185E-03 -8.3587E-04 9.6522E-05 -4.7497E-06 S6 3.3842E-03 -2.1283E-03 -1.4787E-02 2.0147E-02 -1.2933E-02 4.6392E-03 -9.3531E-04 9.4872E-05 -3.1947E-06 S7 -2.2267E-02 1.6441E-02 -2.8112E-02 3.2426E-02 -2.2598E-02 9.6609E-03 -2.5019E-03 3.6578E-04 -2.3387E-05 S8 -3.6452E-02 2.0679E-02 -2.0519E-02 1.9563E-02 -1.3435E-02 6.1224E-03 -1.7543E-03 2.8842E-04 -2.0708E-05 S9 -7.0933E-03 -8.8155E-03 1.3541E-02 -1.8603E-02 1.5060E-02 -7.6370E-03 2.3384E-03 -3.9806E-04 2.9264E-05 S10 -1.6568E-02 -6.1947E-03 5.4874E-03 -5.2346E-03 2.5056E-03 -6.3028E-04 7.7530E-05 -3.3418E-06 0.0000E+00 S11 -3.4048E-02 9.0251E-03 3.3198E-03 -5.6482E-03 3.3971E-03 -1.0462E-03 1.7657E-04 -1.5661E-05 5.7225E-07 S12 -6.1222E-02 1.9811E-02 -4.6712E-03 4.7411E-04 4.3894E-04 -2.2684E-04 4.7110E-05 -4.6705E-06 1.8145E-07 S13 -2.2957E-02 1.3605E-02 -1.2703E-02 6.6050E-03 -2.2786E-03 5.0955E-04 -7.0461E-05 5.4288E-06 -1.7624E-07 S14 -1.9806E-04 6.3438E-03 -5.4357E-03 1.8976E-03 -4.2993E-04 6.4687E-05 -5.9255E-06 2.9123E-07 -5.7918E-09 S15 -1.1504E-02 -1.2215E-02 4.0642E-03 -4.3300E-04 -7.7718E-05 2.9128E-05 -3.6350E-06 2.1311E-07 -4.9214E-09 S16 1.8930E-02 -2.6536E-02 9.6624E-03 -2.1549E-03 3.0850E-04 -2.8070E-05 1.5464E-06 -4.5954E-08 5.4413E-10 S17 -5.8735E-02 1.0282E-02 -1.5329E-03 2.1925E-04 -2.1621E-05 1.3006E-06 -4.5775E-08 8.6655E-10 -6.8069E-12 S18 -6.4904E-02 1.4990E-02 -2.8152E-03 3.8657E-04 -3.6851E-05 2.3472E-06 -9.4754E-08 2.1819E-09 -2.1723E-11

Table 10

FIG. 10A shows the on-axis chromatic aberration curve of the optical imaging lens group of Example 5, which represents the deviation of the converging point of light of different wavelengths after passing through the lens. 10B shows astigmatism curves of the optical imaging lens group of Example 5, which represent the meridional curvature of the image plane and the sagittal image plane curvature. FIG. 10C shows the distortion curve of the optical imaging lens group of Example 5, which represents the distortion magnitude values corresponding to different image heights. FIG. 10D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to FIGS. 10A to 10D , it can be seen that the optical imaging lens group given in Embodiment 5 can achieve good imaging quality.

Example 6

The optical imaging lens group according to Embodiment 6 of the present application is described below with reference to FIGS. 11 to 12D . FIG. 11 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 6 of the present application.

As shown in FIG. 11 , the optical imaging lens group sequentially includes from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a Six lenses E6, seventh lens E7, eighth lens E8, ninth lens E9, filter E10 and imaging surface S21.

The first lens E1 has positive refractive power, the object side S1 is convex, and the image side S2 is concave. The second lens E2 has positive refractive power, the object side S3 is convex, and the image side S4 is concave. The third lens E3 has positive refractive power, the object side S5 is convex, and the image side S6 is concave. The fourth lens E4 has negative refractive power, the object side S7 is convex, and the image side S8 is concave. The fifth lens E5 has positive refractive power, the object side S9 is convex, and the image side S10 is convex. The sixth lens E6 has negative refractive power, the object side S11 is concave, and the image side S12 is convex. The seventh lens E7 has positive refractive power, the object side S13 is convex, and the image side S14 is concave. The eighth lens E8 has positive refractive power, the object side S15 is convex, and the image side S16 is concave. The ninth lens E9 has negative refractive power, the object side S17 is convex, and the image side S18 is concave. The filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In this example, the total effective focal length f of the optical imaging lens group is 5.86mm, the total length TTL of the optical imaging lens group is 7.60mm, and half the diagonal length of the effective pixel area on the imaging plane S21 of the optical imaging lens group is ImgH is 5.60mm, the maximum field of view FOV of the optical imaging lens group is 86.2°, and the F number Fno of the optical imaging lens group is 1.69.

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

Table 11

face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.0587E-02 -3.5201E-03 3.2671E-03 -2.5643E-03 1.2888E-03 -3.5691E-04 5.2952E-05 -3.7973E-06 9.8521E-08 S2 -2.9154E-02 -5.1156E-03 1.2934E-02 -1.0084E-02 5.8671E-03 -2.3873E-03 6.1537E-04 -9.0226E-05 5.7933E-06 S3 -1.9741E-02 -1.8119E-03 1.5782E-03 3.2253E-03 -4.1675E-03 2.2911E-03 -7.4953E-04 1.3973E-04 -1.0974E-05 S4 -9.1290E-03 1.5767E-03 -2.3267E-02 2.9248E-02 -1.7197E-02 5.4948E-03 -9.1595E-04 5.9690E-05 9.7264E-07 S5 -2.2754E-03 3.4418E-03 -2.7706E-02 3.5564E-02 -2.1662E-02 7.6045E-03 -1.5801E-03 1.8049E-04 -8.7338E-06 S6 9.6942E-04 6.1026E-03 -3.4175E-02 4.6952E-02 -3.5370E-02 1.6110E-02 -4.4500E-03 6.8863E-04 -4.5678E-05 S7 -2.1716E-02 1.2577E-02 -2.0279E-02 2.3166E-02 -1.6074E-02 6.8112E-03 -1.7411E-03 2.5419E-04 -1.6709E-05 S8 -3.6282E-02 1.9945E-02 -2.0027E-02 1.9863E-02 -1.4250E-02 6.7696E-03 -2.0073E-03 3.3876E-04 -2.4800E-05 S9 -7.6575E-03 -4.2532E-03 1.9582E-03 -2.8167E-03 2.4357E-03 -1.5029E-03 5.5257E-04 -1.1208E-04 9.9483E-06 S10 -1.5604E-02 -3.6325E-03 1.5855E-03 -2.2690E-03 1.1668E-03 -2.5065E-04 5.0156E-06 5.9072E-06 -5.7947E-07 S11 -3.5048E-02 1.3675E-02 -2.8865E-03 -1.2244E-03 1.5111E-03 -5.5299E-04 9.9505E-05 -9.0927E-06 3.3810E-07 S12 -6.2212E-02 2.1537E-02 -7.0452E-03 1.8528E-03 4.6695E-05 -1.7348E-04 4.5398E-05 -5.0015E-06 2.0772E-07 S13 -2.3679E-02 1.6514E-02 -1.5650E-02 7.9740E-03 -2.6595E-03 5.8139E-04 -8.0061E-05 6.2409E-06 -2.0702E-07 S14 -6.4541E-03 1.5653E-02 -1.1750E-02 4.2550E-03 -9.5770E-04 1.3747E-04 -1.1970E-05 5.6751E-07 -1.1105E-08 S15 -1.3434E-02 -1.2019E-02 4.0527E-03 -4.0988E-04 -9.9341E-05 3.5870E-05 -4.6074E-06 2.8059E-07 -6.7489E-09 S16 1.9693E-02 -2.8046E-02 1.0376E-02 -2.3342E-03 3.3461E-04 -3.0197E-05 1.6290E-06 -4.6467E-08 5.0690E-10 S17 -5.9536E-02 1.0377E-02 -1.4109E-03 1.8518E-04 -1.7472E-05 1.0176E-06 -3.4484E-08 6.1855E-10 -4.4669E-12 S18 -6.5993E-02 1.5349E-02 -2.7931E-03 3.6796E-04 -3.4047E-05 2.1358E-06 -8.5852E-08 1.9826E-09 -1.9879E-11

Table 12

FIG. 12A shows the on-axis chromatic aberration curve of the optical imaging lens group of Example 6, which represents the deviation of the converging point of light of different wavelengths after passing through the lens. 12B shows astigmatism curves of the optical imaging lens group of Example 6, which represent the meridional curvature of the image plane and the sagittal image plane curvature. FIG. 12C shows the distortion curve of the optical imaging lens group of Example 6, which represents the distortion magnitude values corresponding to different image heights. FIG. 12D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 6, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to FIGS. 12A to 12D , it can be seen that the optical imaging lens group given in Embodiment 6 can achieve good imaging quality.

Example 7

The optical imaging lens group according to Embodiment 7 of the present application is described below with reference to FIGS. 13 to 14D . FIG. 13 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 7 of the present application.

As shown in FIG. 13 , the optical imaging lens group sequentially includes from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a Six lenses E6, seventh lens E7, eighth lens E8, ninth lens E9, filter E10 and imaging surface S21.

The first lens E1 has positive refractive power, the object side S1 is convex, and the image side S2 is concave. The second lens E2 has positive refractive power, the object side S3 is convex, and the image side S4 is concave. The third lens E3 has negative refractive power, the object side S5 is convex, and the image side S6 is concave. The fourth lens E4 has negative refractive power, the object side S7 is convex, and the image side S8 is concave. The fifth lens E5 has positive refractive power, the object side S9 is concave, and the image side S10 is convex. The sixth lens E6 has negative refractive power, the object side S11 is concave, and the image side S12 is convex. The seventh lens E7 has positive refractive power, the object side S13 is convex, and the image side S14 is concave. The eighth lens E8 has positive refractive power, the object side S15 is convex, and the image side S16 is concave. The ninth lens E9 has negative refractive power, the object side S17 is convex, and the image side S18 is concave. The filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In this example, the total effective focal length f of the optical imaging lens group is 5.82mm, the total length TTL of the optical imaging lens group is 7.56mm, and the half of the diagonal length of the effective pixel area on the imaging plane S21 of the optical imaging lens group is ImgH It is 5.55mm, the maximum field of view FOV of the optical imaging lens group is 84.5°, and the F number Fno of the optical imaging lens group is 1.68.

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

Table 13

face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.2033E-02 -5.9152E-04 -5.7619E-04 4.2125E-04 -6.5086E-05 2.4017E-06 0.0000E+00 0.0000E+00 0.0000E+00 S2 -3.3273E-02 3.0546E-03 2.8068E-03 -1.0151E-03 1.7857E-04 -1.5706E-05 0.0000E+00 0.0000E+00 0.0000E+00 S3 -2.1362E-02 1.3417E-03 2.1889E-03 -1.2806E-03 1.8489E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.9138E-02 1.3906E-02 -1.9365E-02 1.2802E-02 -4.3528E-03 7.3694E-04 -4.6504E-05 0.0000E+00 0.0000E+00 S5 -6.5887E-03 9.7681E-03 -1.4626E-02 1.0317E-02 -3.1526E-03 3.4764E-04 0.0000E+00 0.0000E+00 0.0000E+00 S6 -8.7049E-03 1.8351E-03 -3.3434E-03 2.3890E-03 -9.6703E-04 1.4515E-04 0.0000E+00 0.0000E+00 0.0000E+00 S7 -1.7885E-02 -9.0861E-04 2.0821E-03 -8.7695E-04 1.9048E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -2.2298E-02 -1.1253E-03 3.3358E-03 -1.3358E-03 3.0034E-04 -1.5900E-05 0.0000E+00 0.0000E+00 0.0000E+00 S9 -8.9766E-03 2.2654E-03 -6.8312E-03 4.4220E-03 -1.6338E-03 2.2243E-04 0.0000E+00 0.0000E+00 0.0000E+00 S10 -2.1996E-02 9.9391E-03 -8.9223E-03 3.1046E-03 -6.0079E-04 5.2754E-05 0.0000E+00 0.0000E+00 0.0000E+00 S11 -5.0249E-02 3.2258E-02 -2.0837E-02 1.0688E-02 -4.7581E-03 1.8151E-03 -4.7137E-04 6.8734E-05 -4.2690E-06 S12 -6.0927E-02 2.8086E-02 -1.3302E-02 4.4846E-03 -7.0972E-04 4.4148E-06 1.4334E-05 -1.8328E-06 7.3612E-08 S13 -1.8982E-02 1.3221E-02 -1.2851E-02 6.6881E-03 -2.3704E-03 5.5356E-04 -7.9638E-05 6.3142E-06 -2.0918E-07 S14 -4.6499E-03 7.5425E-03 -4.1137E-03 7.9235E-04 -7.0136E-05 2.8260E-06 -3.9406E-08 0.0000E+00 0.0000E+00 S15 -1.4122E-02 -9.8236E-03 2.5432E-03 1.3571E-04 -2.0283E-04 4.4825E-05 -4.6817E-06 2.4459E-07 -5.1655E-09 S16 1.8567E-02 -2.5446E-02 8.7655E-03 -1.7916E-03 2.2687E-04 -1.7512E-05 7.7352E-07 -1.6611E-08 1.0359E-10 S17 -5.6975E-02 8.6531E-03 -7.3231E-04 5.5711E-05 -4.0170E-06 2.0930E-07 -6.4694E-09 1.0005E-10 -5.2358E-13 S18 -6.4030E-02 1.3188E-02 -2.1111E-03 2.4440E-04 -1.9461E-05 1.0165E-06 -3.2817E-08 5.8996E-10 -4.5091E-12

Table 14

FIG. 14A shows the on-axis chromatic aberration curve of the optical imaging lens group of Embodiment 7, which represents the deviation of the converging point of light of different wavelengths after passing through the lens. 14B shows astigmatism curves of the optical imaging lens group of Example 7, which represent the meridional curvature of the field and the sagittal curvature of the field. FIG. 14C shows the distortion curve of the optical imaging lens group of Example 7, which represents the distortion magnitude values corresponding to different image heights. FIG. 14D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 7, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to FIGS. 14A to 14D , it can be seen that the optical imaging lens group given in Embodiment 7 can achieve good imaging quality.

Example 8

The optical imaging lens group according to Embodiment 8 of the present application is described below with reference to FIGS. 15 to 16D . FIG. 15 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 8 of the present application.

As shown in FIG. 15 , the optical imaging lens group sequentially includes from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a Six lenses E6, seventh lens E7, eighth lens E8, ninth lens E9, filter E10 and imaging surface S21.

The first lens E1 has positive refractive power, the object side S1 is convex, and the image side S2 is concave. The second lens E2 has positive refractive power, the object side S3 is convex, and the image side S4 is concave. The third lens E3 has positive refractive power, the object side S5 is convex, and the image side S6 is concave. The fourth lens E4 has negative refractive power, the object side S7 is convex, and the image side S8 is concave. The fifth lens E5 has positive refractive power, the object side S9 is convex, and the image side S10 is convex. The sixth lens E6 has negative refractive power, the object side S11 is concave, and the image side S12 is convex. The seventh lens E7 has positive refractive power, the object side S13 is convex, and the image side S14 is convex. The eighth lens E8 has positive refractive power, the object side S15 is convex, and the image side S16 is concave. The ninth lens E9 has negative refractive power, the object side S17 is convex, and the image side S18 is concave. The filter E10 has an object side S19 and an image side S20. The light from the object sequentially passes through the surfaces S1 to S20 and is finally imaged on the imaging surface S21.

In this example, the total effective focal length f of the optical imaging lens group is 5.92mm, the total length TTL of the optical imaging lens group is 7.75mm, and half the diagonal length of the effective pixel area on the imaging plane S21 of the optical imaging lens group is ImgH It is 5.60mm, the maximum field of view FOV of the optical imaging lens group is 85.5°, and the F number Fno of the optical imaging lens group is 1.67.

Table 15 shows the basic parameter table of the optical imaging lens group of Example 8, wherein the units of curvature radius, thickness/distance, and focal length are all millimeters (mm). Table 16 shows the coefficients of higher order terms that can be used for each aspherical mirror surface in Example 8, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

Table 15

face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.0943E-02 -5.8051E-04 -8.0766E-04 6.1393E-04 -1.3556E-04 1.1021E-05 0.0000E+00 0.0000E+00 0.0000E+00 S2 -2.7864E-02 -6.5425E-03 1.2316E-02 -6.7138E-03 2.1806E-03 -4.0570E-04 3.2734E-05 0.0000E+00 0.0000E+00 S3 -1.9694E-02 -2.5372E-03 2.8271E-03 1.9544E-03 -3.1859E-03 1.7148E-03 -5.2508E-04 9.1623E-05 -6.8121E-06 S4 -7.1373E-03 -1.3029E-02 1.1776E-02 -9.2231E-03 6.2641E-03 -2.8447E-03 7.5128E-04 -1.0189E-04 5.4604E-06 S5 -1.0070E-03 -9.1607E-03 3.3334E-03 1.0945E-03 -3.6963E-04 -2.2373E-04 1.2422E-04 -2.2359E-05 1.4345E-06 S6 5.2459E-03 -1.3693E-02 8.6269E-03 -3.3072E-03 5.7088E-04 -2.7934E-05 0.0000E+00 0.0000E+00 0.0000E+00 S7 -1.9168E-02 5.9513E-04 4.9188E-03 -3.8335E-03 1.1621E-03 -1.1612E-04 0.0000E+00 0.0000E+00 0.0000E+00 S8 -3.6127E-02 1.9444E-02 -1.9450E-02 2.0571E-02 -1.5602E-02 7.5586E-03 -2.2159E-03 3.6105E-04 -2.5128E-05 S9 -5.0211E-03 -1.7803E-02 2.9763E-02 -3.6152E-02 2.7261E-02 -1.3033E-02 3.7957E-03 -6.1609E-04 4.3047E-05 S10 -1.3020E-02 -1.1387E-02 1.1076E-02 -8.7533E-03 3.9395E-03 -9.9321E-04 1.2600E-04 -5.2401E-06 -1.2557E-07 S11 -3.1780E-02 5.3948E-03 5.8365E-03 -6.4378E-03 3.4373E-03 -1.0006E-03 1.6293E-04 -1.4073E-05 5.0350E-07 S12 -6.0661E-02 1.7745E-02 -2.6426E-03 -5.1591E-04 6.8760E-04 -2.5263E-04 4.6201E-05 -4.2756E-06 1.5929E-07 S13 -2.5614E-02 1.3805E-02 -1.1943E-02 6.1377E-03 -2.0895E-03 4.5721E-04 -6.1628E-05 4.6343E-06 -1.4734E-07 S14 4.2247E-03 3.4227E-03 -5.0818E-03 2.2518E-03 -6.0570E-04 1.0063E-04 -9.6991E-06 4.8912E-07 -9.8430E-09 S15 -4.8371E-03 -1.6868E-02 6.2421E-03 -1.2127E-03 1.0990E-04 7.8952E-07 -1.0645E-06 8.5537E-08 -2.2694E-09 S16 1.8389E-02 -2.6206E-02 9.5610E-03 -2.1471E-03 3.1163E-04 -2.8991E-05 1.6526E-06 -5.1807E-08 6.7113E-10 S17 -5.7883E-02 9.9894E-03 -1.4388E-03 1.9737E-04 -1.8824E-05 1.1017E-06 -3.7842E-08 7.0019E-10 -5.3782E-12 S18 -6.1862E-02 1.3375E-02 -2.2468E-03 2.6969E-04 -2.2394E-05 1.2553E-06 -4.5501E-08 9.6418E-10 -9.0447E-12

Table 16

FIG. 16A shows the on-axis chromatic aberration curve of the optical imaging lens group of Embodiment 8, which represents the deviation of the converging point of light of different wavelengths after passing through the lens. 16B shows astigmatism curves of the optical imaging lens group of Example 8, which represent the meridional curvature of the field and the sagittal curvature of the field. FIG. 16C shows the distortion curve of the optical imaging lens group of Embodiment 8, which represents the distortion magnitude values corresponding to different image heights. FIG. 16D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 8, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to FIGS. 16A to 16D , it can be seen that the optical imaging lens group given in Embodiment 8 can achieve good imaging quality.

In conclusion, Examples 1 to 8 satisfy the relationships shown in Table 17, respectively.

Table 17

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

The above description is only a preferred embodiment of the present application and an illustration of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, and should also cover, without departing from the inventive concept, the above-mentioned technical features or their Other technical solutions formed by any combination of equivalent features. For example, a technical solution is formed by replacing the above-mentioned features with the technical features disclosed in this application (but not limited to) with similar functions.

Claims (10)

1. An optical imaging lens group, comprising in sequence from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, The seventh lens, the eighth lens and the ninth lens are characterized in that: The fourth lens has negative refractive power, and its image side is concave; The image side surface of the fifth lens is convex; the eighth lens has positive refractive power; and The distance on the optical axis from the object side of the first lens to the imaging plane of the optical imaging lens group is TTL, half the diagonal length of the effective pixel area of the optical imaging lens group is 1 mgH, and the optical imaging The F-number Fno of the lens group satisfies: Fno×TTL/ImgH<2.5. 2 . The optical imaging lens group according to claim 1 , wherein the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2<f5/f6<-1.2. 3 . 3. The optical imaging lens group according to claim 1, wherein the effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging lens group satisfy: f4/f<-1. 4. The optical imaging lens group according to claim 1, wherein the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -2<(R8 -R10)/(R8+R10)<-1. 5. The optical imaging lens group according to claim 1, wherein the image side surface of the eighth lens is concave, And the curvature radius R16 of the image side surface of the eighth lens and the effective focal length f8 of the eighth lens satisfy: 0<R16/f8<0.5. 6. The optical imaging lens group according to claim 1, wherein the combined focal length f56 of the fifth lens and the sixth lens and the total effective focal length f of the optical imaging lens group satisfy: f56/f <-5. 7. The optical imaging lens group according to claim 1, wherein the combined focal length f78 of the seventh lens and the eighth lens and the total effective focal length f of the optical imaging lens group satisfy: 0.9<f78 /f<1.5. 8 . The optical imaging lens group according to claim 1 , wherein the center thickness CT4 of the fourth lens on the optical axis is the same as the fourth lens and the fifth lens on the optical axis. 9 . The separation distance T45 above satisfies: 0.3<CT4/T45<0.8. 9 . The optical imaging lens group according to claim 1 , wherein the center thickness CT7 of the seventh lens on the optical axis and the center thickness CT8 of the eighth lens on the optical axis satisfy 9 . : 0.7<CT7/CT8<1.2. 10. An optical imaging lens group, comprising in sequence from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, The seventh lens, the eighth lens and the ninth lens are characterized in that: The fourth lens has negative refractive power, and its image side is concave; The image side surface of the fifth lens is convex; the eighth lens has positive refractive power; and The separation distance T23 between the second lens and the third lens on the optical axis, the separation distance T34 between the third lens and the fourth lens on the optical axis, and the The distance Tr3r8 from the object side surface to the image side surface of the fourth lens on the optical axis satisfies: 0<10×(T23+T34)/Tr3r8<1.

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