CN114167585A

CN114167585A - Image pickup lens group

Info

Publication number: CN114167585A
Application number: CN202111539023.6A
Authority: CN
Inventors: 陈超; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-03-11
Anticipated expiration: 2041-12-15
Also published as: CN114167585B

Abstract

The invention provides a camera lens group. Include in order to the light-emitting side of making a video recording the battery of lens along the income light side of making a video recording the battery of lens: a first lens element with refractive power; a second lens element with refractive power; a third lens element with refractive power; the fourth lens has negative refractive power, and the surface of the fourth lens, which is close to the light incidence side, is a convex surface; the fifth lens has negative refractive power, and the surface of the fifth lens, which is close to the light emergent side, is a concave surface; a sixth lens element with refractive power; the seventh lens element with refractive power has a concave surface on a surface thereof near the light incident side; wherein, the effective focal length f of the image pickup lens group and the effective focal length f4 of the fourth lens satisfy: -3.3< f4/f < 0; the imaging surface of the camera lens group satisfies the following condition that the ImgH which is half of the diagonal length of the effective pixel area on the imaging surface of the camera lens group is as follows: ImgH > 5. The invention solves the problem of poor imaging quality of the lens in the prior art.

Description

Image pickup lens group

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to a camera lens group.

Background

At present, with the increasingly powerful mobile phone photographing function, more and more people are interested in taking more beautiful photos with mobile phones, so that the requirements of users on mobile phone photographing are more and more diversified, and the lens of the mobile phone at present cannot meet the requirements of users on multifunctional and high-image-quality mobile phone photographing.

That is to say, the lens in the prior art has the problem of poor imaging quality.

Disclosure of Invention

The invention mainly aims to provide a camera lens group to solve the problem of poor imaging quality of a lens in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided an image pickup lens group comprising, in order from an incident side of the image pickup lens group to an emergent side of the image pickup lens group: a first lens element with refractive power; a second lens element with refractive power; a third lens element with refractive power; the fourth lens has negative refractive power, and the surface of the fourth lens, which is close to the light incidence side, is a convex surface; the fifth lens has negative refractive power, and the surface of the fifth lens, which is close to the light emergent side, is a concave surface; a sixth lens element with refractive power; the seventh lens element with refractive power has a concave surface on a surface thereof near the light incident side; wherein, the effective focal length f of the image pickup lens group and the effective focal length f4 of the fourth lens satisfy: -3.3< f4/f < 0; the imaging surface of the camera lens group satisfies the following condition that the ImgH which is half of the diagonal length of the effective pixel area on the imaging surface of the camera lens group is as follows: ImgH > 5.

Further, the effective half aperture DT12 of the surface of the first lens close to the light-emitting side and the effective half aperture DT41 of the surface of the fourth lens close to the light-entering side satisfy the following conditions: DT41/DT12 <1.

Further, one of the first lens to the seventh lens is a variable focal length lens whose focal length ft satisfies: | ftmax/ftmin | <1.

Further, the minimum focal length fmin of the image pickup lens group and the maximum focal length fmax of the image pickup lens group satisfy: (fmax/fmin) 10 < 10.

Further, the curvature radius of the surface of the second lens close to the light incident side is variable, and the curvature radius R3 of the surface of the second lens close to the light incident side satisfies: | R3 | > 48 mm.

Further, one of the first lens to the seventh lens is a variable focal length lens whose focal length ft satisfies: 300< ft < 200.

Further, a center thickness CT3 of the third lens on the optical axis of the imaging lens group and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.2 < CT4/CT 3< 0.8.

Further, the fourth lens satisfies, between a center thickness CT4 on the optical axis of the imaging lens group and an edge thickness ET4 of the fourth lens: 1.5< ET4/CT 4< 2.5.

Further, an effective focal length f5 of the image pickup lens group and an effective focal length f5 of the fifth lens satisfy: -2.5< f5/f < -1.

Further, the curvature radius R10 of the surface of the fifth lens close to the light-emitting side and the curvature radius R7 of the surface of the fourth lens close to the light-entering side satisfy that: 0< R10/R7 <1.

Further, a center thickness CT6 of the sixth lens on the optical axis of the imaging lens group and a center thickness CT7 of the seventh lens on the optical axis satisfy: CT7/CT6 is more than or equal to 0.9.

Further, an on-axis distance SAG41 from an intersection point of a surface of the fourth lens close to the light incident side and the optical axis of the image pickup lens group to an effective radius vertex of the surface of the fourth lens close to the light incident side, and an on-axis distance SAG51 from an intersection point of a surface of the fifth lens close to the light incident side and the optical axis to an effective radius vertex of the surface of the fifth lens close to the light incident side satisfy: -2.6 < SAG51/SAG41 < -1.

Further, an on-axis distance SAG42 between an intersection point of a surface of the fourth lens on the light exit side and the optical axis of the image pickup lens group to an effective radius vertex of the surface of the fourth lens on the light exit side, and an on-axis distance SAG52 between an intersection point of a surface of the fifth lens on the light exit side and the optical axis to an effective radius vertex of the surface of the fifth lens on the light exit side satisfy: -1.8 < SAG52/SAG42 < -0.2.

Further, an air interval T12 of the first lens and the second lens on the optical axis of the image pickup lens group, an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 1< T45/(T34+ T23+ T12) <2.

Further, the refractive power of the second lens element is continuously variable.

Further, the second lens is a liquid lens.

Further, one of the first lens to the seventh lens is a variable focal length lens, and a focal length ft of the variable focal length lens and an effective focal length f of the image pickup lens group satisfy: -3< (f/ft) > 100< 4.

Further, the edge thickness ET7 of the seventh lens and the edge thickness ET6 of the sixth lens satisfy: 1< ET7/ET6< 2.8.

Further, the air interval T45 of the fourth lens and the fifth lens on the optical axis of the image pickup lens group, and the air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: 1< T67/T45< 1.5.

According to another aspect of the present invention, there is provided an image pickup lens group, comprising in order from an incident side of the image pickup lens group to an emergent side of the image pickup lens group: a first lens element with refractive power; a second lens element with refractive power; a third lens element with refractive power; the fourth lens has negative refractive power, and the surface of the fourth lens, which is close to the light incidence side, is a convex surface; the fifth lens has negative refractive power, and the surface of the fifth lens, which is close to the light emergent side, is a concave surface; a sixth lens element with refractive power; the seventh lens element with refractive power has a concave surface on a surface thereof near the light incident side; wherein, the effective focal length f of the image pickup lens group and the effective focal length f4 of the fourth lens satisfy: -3.3< f4/f < 0; the edge thickness ET7 of the seventh lens and the edge thickness ET6 of the sixth lens meet the following condition: 1< ET7/ET6< 2.8.

Further, the second lens is a liquid lens.

By applying the technical scheme of the invention, the photographing lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from the light-in side of the photographing lens group to the light-out side of the photographing lens group, wherein the first lens has refractive power; the second lens element with refractive power; the third lens element with refractive power; the fourth lens element with negative refractive power has a convex surface on the light incident side; the fifth lens element with negative refractive power has a concave surface on the surface thereof near the light emergent side; the sixth lens element with refractive power; the seventh lens element with refractive power has a concave surface on a surface thereof near the light incident side; wherein, the effective focal length f of the image pickup lens group and the effective focal length f4 of the fourth lens satisfy: -3.3< f4/f < 0; the imaging surface of the camera lens group satisfies the following condition that the ImgH which is half of the diagonal length of the effective pixel area on the imaging surface of the camera lens group is as follows: ImgH > 5.

Through the positive and negative distribution of the refractive power of each lens of the shooting lens group, the low-order aberration of the shooting lens group can be effectively balanced, the tolerance sensitivity of the shooting lens group can be reduced, the imaging quality of the shooting lens group can be guaranteed while the miniaturization of the shooting lens group is kept, and the imaging quality of the shooting lens group can be improved by the seven-piece shooting lens group. The ratio of the effective focal length of the fourth lens to the effective focal length of the camera lens group is controlled within a reasonable range, so that the refractive power of the camera lens group can be reasonably distributed, and imaging of the camera lens group is facilitated. And the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the camera lens group is controlled within a reasonable range, so that the camera lens group can realize a large image surface, and the imaging quality of the camera lens group is ensured.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view showing a configuration of an image pickup lens group according to a first example of the present invention;

fig. 2 to 7 show an on-axis chromatic aberration curve, an astigmatic curve in a first state, a distortion curve in the first state, an astigmatic curve in a second state, a distortion curve in the second state, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 1;

fig. 8 is a schematic view showing a configuration of an image pickup lens group according to a second example of the present invention;

fig. 9 to 14 show an on-axis chromatic aberration curve, an astigmatic curve in a first state, a distortion curve in the first state, an astigmatic curve in a second state, a distortion curve in the second state, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 8;

fig. 15 is a schematic view showing a configuration of an image pickup lens group according to a third example of the present invention;

fig. 16 to 21 show an on-axis chromatic aberration curve, an astigmatic curve in a first state, a distortion curve in the first state, an astigmatic curve in a second state, a distortion curve in the second state, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 15;

fig. 22 is a schematic view showing a configuration of an image pickup lens group of example four of the present invention;

fig. 23 to 28 show an on-axis chromatic aberration curve, an astigmatic curve in a first state, a distortion curve in the first state, an astigmatic curve in a second state, a distortion curve in the second state, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 22;

fig. 29 is a schematic view showing a configuration of an image pickup lens group of example five of the present invention;

fig. 30 to 35 show an on-axis chromatic aberration curve, an astigmatic curve in a first state, a distortion curve in the first state, an astigmatic curve in a second state, a distortion curve in the second state, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 29;

fig. 36 is a schematic view showing a configuration of an image pickup lens group of example six of the present invention;

fig. 37 to 42 show an on-axis chromatic aberration curve, an astigmatic curve in a first state, a distortion curve in the first state, an astigmatic curve in a second state, a distortion curve in the second state, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 36;

fig. 43 is a schematic view showing a configuration of an image pickup lens group of example seven of the present invention;

fig. 44 to 49 respectively show an on-axis chromatic aberration curve, an astigmatic curve in a first state, a distortion curve in the first state, an astigmatic curve in a second state, a distortion curve in the second state, and a chromatic aberration of magnification curve of the imaging lens group in fig. 43;

FIG. 50 shows a schematic structural view of a second lens of an alternative embodiment of the present invention;

fig. 51 shows a schematic view of the structure of a second lens of another alternative embodiment of the present invention.

Wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the surface of the first lens close to the light incidence side; s2, the surface of the first lens close to the light-emitting side; e2, second lens; s3, the surface of the second lens close to the light incidence side; s7, the surface of the second lens close to the light-emitting side; e3, third lens; s8, the surface of the third lens close to the light incidence side; s9, the surface of the third lens close to the light-emitting side; e4, fourth lens; s10, the surface of the fourth lens close to the light incidence side; s11, the surface of the fourth lens close to the light-emitting side; e5, fifth lens; s12, the surface of the fifth lens close to the light incidence side; s13, the surface of the fifth lens close to the light-emitting side; e6, sixth lens; s14, the surface of the sixth lens close to the light incidence side; s15, the surface of the sixth lens close to the light-emitting side; e7, a seventh lens, S16 and a surface of the seventh lens close to the light incidence side; s17, the surface of the seventh lens close to the light-emitting side; e8, a filter plate; s18, the surface of the filter close to the light incident side; s19, enabling the filter to be close to the surface of the light emergent side; and S20, imaging surface.

Detailed Description

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 invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all 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.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

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 close to the object side becomes the surface of the lens close to the light inlet side, and the surface of each lens close to the image side is called the surface of the lens close to the light outlet side. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. For the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

The traditional zoom lens realizes zooming by adjusting the distance between two lenses with fixed focal lengths; and liquid lenses achieve zooming by changing the radius of curvature of the lens, etc. Compared with the traditional zoom system, the liquid lens has the greatest effect of enabling the macro and the telephoto to coexist and be combined into a whole. Therefore, a macro lens with a small number does not need to be arranged independently, and the number of lenses of the mobile phone is reduced. And the thickness of the long-focus macro-function module can be greatly reduced, and the focusing speed of the lens can be greatly improved. The liquid lens has the advantages of compact structure and low cost. The liquid lens provided by the text can better meet the application requirements of the main camera on the next-generation high-end smart phone, and is beneficial to the development of the future mobile phone lens.

The invention provides a camera lens group, aiming at solving the problem of poor imaging quality of a lens in the prior art.

As shown in fig. 1 to 51, the image capturing lens assembly includes, in order from the light incident side of the image capturing lens assembly to the light emergent side of the image capturing lens assembly, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, where the first lens element has refractive power; the second lens element with refractive power; the third lens element with refractive power; the fourth lens element with negative refractive power has a convex surface on the light incident side; the fifth lens element with negative refractive power has a concave surface on the surface thereof near the light emergent side; the sixth lens element with refractive power; the seventh lens element with refractive power has a concave surface on a surface thereof near the light incident side; wherein, the effective focal length f of the image pickup lens group and the effective focal length f4 of the fourth lens satisfy: -3.3< f4/f < 0; the imaging surface of the camera lens group satisfies the following condition that the ImgH which is half of the diagonal length of the effective pixel area on the imaging surface of the camera lens group is as follows: ImgH > 5.

Preferably, an effective focal length f4 of the fourth lens and an effective focal length f of the image pickup lens group satisfy: -2.5< f4/f < -1.5.

In the embodiment, the effective half aperture DT12 of the surface of the first lens close to the light-emitting side and the effective half aperture DT41 of the surface of the fourth lens close to the light-entering side satisfy: DT41/DT12 <1. The effective semi-aperture of the surface of the fourth lens close to the light inlet side and the effective semi-aperture of the surface of the first lens close to the light outlet side are limited within a reasonable range, so that the size of the camera lens group can be reduced, the miniaturization of the camera lens group is met, the resolving power is improved, and the imaging quality of the camera lens group is ensured. Preferably 0.8< DT41/DT12 <1.

In this embodiment, one of the first lens to the seventh lens is a variable focal length lens, and a focal length ft of the variable focal length lens satisfies: | ftmax/ftmin | <1. The ratio of the maximum focal length to the minimum focal length of the focal length variable lens is controlled within a reasonable range, so that the focusing of the camera lens group is realized within a large focal length variation range, a corresponding driving algorithm of the focal length variable lens is combined, a plurality of focal length pictures are sampled during shooting, the focusing speed is high, all positions of a picture are combined into an image according to the clearest sampled focal length position, a full-picture clear image is obtained, the image quality of the camera lens group is greatly improved, and meanwhile, the focusing efficiency of the camera lens group is also improved. By arranging the focal length variable lens, the zooming of the photographing lens group is realized, and the miniaturization of the photographing lens group is facilitated. Preferably, 0.4< | ftmax/ftmin | < 0.8.

In the present embodiment, the minimum focal length fmin of the image pickup lens group and the maximum focal length fmax of the image pickup lens group satisfy: (fmax/fmin) 10 < 10. By reasonably controlling the ratio of the maximum focal length to the minimum focal length of the camera lens group, the refractive power of the camera lens group can be reasonably distributed, so that the camera lens group has good imaging quality and reduced sensitivity. Preferably 8.5 < (fmax/fmin) 10 < 9.5.

In the present embodiment, the curvature radius of the surface of the second lens closer to the light incident side is variable, and the curvature radius R3 of the surface of the second lens closer to the light incident side satisfies: | R3 | > 48 mm. By changing the curvature radius of the surface of the second lens close to the light incidence side, the shooting lens group can realize quick focusing under the condition of small object distance.

In this embodiment, one of the first lens to the seventh lens is a variable focal length lens, and a focal length ft of the variable focal length lens satisfies: 300< ft < 200. The ratio of the shot scenery in the image plane can be improved by controlling the focal length of the focal length variable lens in a certain range, and a full-picture clear image is finally obtained by combining an algorithm driven by the focal length variable lens correspondingly.

In the present embodiment, the center thickness CT3 of the third lens on the optical axis of the imaging lens group and the center thickness CT4 of the fourth lens on the optical axis satisfy: 0.2 < CT4/CT 3< 0.8. The central thickness of the fourth lens and the third lens on the optical axis is reasonably controlled, so that the camera lens group obtains enough space and higher surface freedom, and the capability of correcting curvature of field and astigmatism of the camera lens group is improved. Preferably, 0.3 < CT4/CT 3< 0.6.

In the present embodiment, the fourth lens satisfies, between a center thickness CT4 on the optical axis of the imaging lens group and an edge thickness ET4 of the fourth lens: 1.5< ET4/CT 4< 2.5. The central thickness of the fourth lens on the optical axis and the edge thickness of the fourth lens are reasonably controlled, the processing difficulty is reduced, and meanwhile, the assembling difficulty is reduced. Preferably, 1.8< ET4/CT 4< 2.3.

In the present embodiment, the effective focal length f of the image pickup lens group and the effective focal length f5 of the fifth lens satisfy: -2.5< f5/f < -1. By controlling f5/f within a reasonable range, the fifth lens element bears a larger refractive power, which is beneficial to correcting aberration, and the total length of the image pickup lens assembly can be shortened, which is beneficial to miniaturization of the image pickup lens assembly. Preferably, -2.3 < f5/f < -1.3.

In the present embodiment, a curvature radius R10 of the surface of the fifth lens near the light exit side and a curvature radius R7 of the surface of the fourth lens near the light entrance side satisfy: 0< R10/R7 <1. The curvature radius of the surface of the fifth lens close to the light incident side and the curvature radius of the surface of the fourth lens close to the light incident side are reasonably controlled within a certain range, so that the on-axis aberration generated by the camera lens group can be effectively balanced, and the imaging quality of the camera lens group is ensured. Preferably, 0.2 < R10/R7 < 0.8.

In the present embodiment, the center thickness CT6 of the sixth lens on the optical axis of the imaging lens group and the center thickness CT7 of the seventh lens on the optical axis satisfy: CT7/CT6 is more than or equal to 0.9. The ratio of the center thicknesses of the seventh lens and the sixth lens on the optical axis is reasonably controlled, and the assembly of the shooting lens group is facilitated. Preferably, 0.9 ≦ CT7/CT6 ≦ 1.5.

In this embodiment, an on-axis distance SAG41 from an intersection point of a surface of the fourth lens on the light incident side and the optical axis of the image pickup lens group to an effective radius vertex of the surface of the fourth lens on the light incident side, and an on-axis distance SAG51 from an intersection point of a surface of the fifth lens on the light incident side and the optical axis to an effective radius vertex of the surface of the fifth lens on the light incident side satisfy: -2.6 < SAG51/SAG41 < -1. By controlling SAG51/SAG41 within a reasonable range, the chief ray angle of the shooting lens group is adjusted conveniently, the relative brightness of the shooting lens group is effectively improved, and the definition of an image surface is improved. Preferably, -2.3 < SAG51/SAG41 < -1.3.

In this embodiment, the on-axis distance SAG42 between the intersection point of the optical axis of the imaging lens group and the surface of the fourth lens on the light exit side to the effective radius vertex of the surface of the fourth lens on the light exit side, and the on-axis distance SAG52 between the intersection point of the optical axis and the surface of the fifth lens on the light exit side to the effective radius vertex of the surface of the fifth lens on the light exit side satisfy: -1.8 < SAG52/SAG42 < -0.2. The ratio range of SAG52 and SAG42 is reasonably controlled, and the imaging lens group is favorable for having a smaller incident angle and higher relative illumination when the principal ray of the imaging lens group is incident on an image surface. Preferably, -1.4 < SAG52/SAG42 < -0.6.

In the present embodiment, an air interval T12 of the first lens and the second lens on the optical axis of the image pickup lens group, an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 1< T45/(T34+ T23+ T12) <2. The camera lens group has the advantages that the T45/(T34+ T23+ T12) is limited within a reasonable range, so that the convergence capacity of the camera lens group on light rays is improved, the focusing position of the light rays is adjusted, the total length of the camera lens group is shortened, and the miniaturization of the camera lens group is guaranteed. Preferably, 1.1< T45/(T34+ T23+ T12) < 1.7.

In this embodiment, the refractive power of the second lens element is continuously variable. The refractive power of the second lens is continuously variable through the module, so that the imaging performance of the camera lens group under different object distances is greatly improved, and the camera lens group can meet the shooting requirements under different object distances; the second lens is set to have continuously variable refractive power, so that the length of the whole shooting lens group is greatly shortened, the structure of the shooting lens group is more compact, and the requirement of miniaturization is met.

In this embodiment, the second lens is a liquid lens. The curvature radius of the liquid lens can be changed, so that the refractive power is continuously variable, and the focusing of the shooting lens group is realized.

In this embodiment, one of the first lens to the seventh lens is a variable focal length lens, and a focal length ft of the variable focal length lens and an effective focal length f of the image pickup lens group satisfy: -3< (f/ft) > 100< 4. The refractive power of the camera lens group is reasonably distributed by controlling the ratio of the effective focal length of the focal length variable lens and the effective focal length of the camera lens group within a certain range, so that the camera lens group has good imaging quality. Preferably, -2.5< (f/ft) > 100< 3.3.

In the present embodiment, the edge thickness ET7 of the seventh lens and the edge thickness ET6 of the sixth lens satisfy: 1< ET7/ET6< 2.8. The ratio of the edge thickness of the seventh lens to the edge thickness of the sixth lens is controlled, which is beneficial to assembly and stability in mass production. Preferably, 1.5< ET7/ET6< 2.4.

In the present embodiment, the air interval T45 of the fourth lens and the fifth lens on the optical axis of the image pickup lens group, and the air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: 1< T67/T45< 1.5. By limiting the T67/T45 within a reasonable range, the curvature of field generated by the lens in front of the fourth lens and the curvature of field generated by the lens behind the fourth lens can be balanced, so that the photographing lens group has reasonable curvature of field to ensure the imaging quality of the photographing lens group. Preferably, 1.1< T67/T45< 1.4.

Example two

As shown in fig. 1 to 51, the image capturing lens assembly sequentially includes, from the light incident side of the image capturing lens assembly to the light exiting side of the image capturing lens assembly: the first lens element with refractive power comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element; the second lens element with refractive power; the third lens element with refractive power; the fourth lens element with negative refractive power has a convex surface on the light incident side; the fifth lens element with negative refractive power has a concave surface on the surface thereof near the light emergent side; the sixth lens element with refractive power; the seventh lens element with refractive power has a concave surface on a surface thereof near the light incident side; wherein, the effective focal length f of the image pickup lens group and the effective focal length f4 of the fourth lens satisfy: -3.3< f4/f < 0; the edge thickness ET7 of the seventh lens and the edge thickness ET6 of the sixth lens meet the following condition: 1< ET7/ET6< 2.8.

Through the positive and negative distribution of the refractive power of each lens of the shooting lens group, the low-order aberration of the shooting lens group can be effectively balanced, the tolerance sensitivity of the shooting lens group can be reduced, the imaging quality of the shooting lens group can be guaranteed while the miniaturization of the shooting lens group is kept, and the imaging quality of the shooting lens group can be improved by the seven-piece shooting lens group. The ratio of the effective focal length of the fourth lens to the effective focal length of the camera lens group is controlled within a reasonable range, so that the refractive power of the camera lens group can be reasonably distributed, and imaging of the camera lens group is facilitated. The ratio of the edge thickness of the seventh lens to the edge thickness of the sixth lens is controlled, which is beneficial to assembly and stability in mass production.

Preferably, an effective focal length f4 of the fourth lens and an effective focal length f of the image pickup lens group satisfy: -2.5< f4/f < -1.5; the edge thickness ET7 of the seventh lens and the edge thickness ET6 of the sixth lens meet the following condition: 1.5< ET7/ET6< 2.4.

The imaging lens group in the present application may employ a plurality of lenses, for example, the seven lenses described above. By reasonably distributing the refractive power, the surface shape, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the camera lens group can be effectively increased, the sensitivity of the camera lens can be reduced, and the machinability of the camera lens can be improved, so that the camera lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones.

In the present application, at least one of the mirror surfaces of each 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.

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

As shown in fig. 50 and 51, S3 is a surface of the second lens near the light-in side, S7 is a surface of the second lens near the light-out side, and S4, S5, and S6 are all surfaces in the middle of the second lens.

Optionally, the above-mentioned image pickup lens group may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an image forming surface.

Specific surface types and parameters of the imaging lens group applicable to the above embodiments are further described below with reference to the drawings.

It should be noted that any one of the following examples one to seven is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 7, an imaging lens group of the first example of the present application is described. Fig. 1 shows a schematic view of an image pickup lens group structure of example one.

As shown in fig. 1, the image capturing lens assembly sequentially includes, from the light incident side to the light emergent side: 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, a filter E8, and an image forming surface S20.

The first lens element E1 with positive refractive power has a convex surface S1 on the light-incident side and a concave surface S2 on the light-exit side. The third lens element E3 with positive refractive power has a convex surface S8 on the light-incident side and a convex surface S9 on the light-exit side. The fourth lens element E4 with negative refractive power has a convex surface S10 on the light-incident side and a concave surface S11 on the light-exit side. The fifth lens element E5 with negative refractive power has a convex surface S12 on the light incident side and a concave surface S13 on the light emergent side. The sixth lens element E6 with positive refractive power has a convex surface S14 on the light-incident side and a convex surface S15 on the light-exit side; the seventh lens element E7 with negative refractive power has a concave surface on a surface S16 thereof near the light incident side and a concave surface S17 thereof near the light emergent side; the filter E7 has a surface S18 close to the light entrance side and a surface S19 close to the light exit side. The light from the object sequentially passes through the respective surfaces S1 to S19 and is finally imaged on the imaging surface S20.

When the object distance of the shooting lens group is 2000mm, the shooting lens group is in the first state, when the object distance of the shooting lens group is 100mm, the shooting lens group is in the second state, and when the object distance of the shooting lens group is infinite, the shooting lens group is in the third state.

Table 1 shows a basic structural parameter table of the image pickup lens group of example one in the first state, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 1

Table 2 shows a basic structural parameter table of the second lens in the second state of the image pickup lens group of example one, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	48.0000	0.0700	1.41	50.0
S4	Spherical surface	48.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1390

Table 3 shows a basic structural parameter table of the second lens in the third state of the image pickup lens group of example one, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-70.0000	0.0700	1.41	50.0
S4	Spherical surface	-70.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1390

TABLE 3

Table 4 shows the effective focal length of the image pickup lens group and the effective focal length of the second lens in three states of the image pickup lens group of example one.

Example one	First state	Second state	Third state
				OBJ(mm)	2000.00	100.00	All-round
f(mm)	5.75	5.29	5.78
				f2(mm)	-275.22	165.09	-240.82
f/ft	-0.02	0.03	-0.02
				f5/f	-1.78	-1.93	-1.77
f4/f	-2.03	-2.21	-2.02

TABLE 4

In the first example, the surface of any one of the first lens E1, the third lens E3 to the seventh lens E7 close to the light incident side and the image side surface are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 5 below gives the high-order coefficient coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1, S2, S7-S14 in example one.

TABLE 5

Fig. 2 shows an on-axis chromatic aberration curve of the image pickup lens group of the first example, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the image pickup lens group. Fig. 3 shows an astigmatism curve in the first state of the imaging lens group of the first example, which represents meridional field curvature and sagittal field curvature. Fig. 4 shows a distortion curve in the first state of the image pickup lens group of the first example, which shows distortion magnitude values corresponding to different angles of view. Fig. 5 shows an astigmatism curve of the imaging lens group of example one in the second state. Fig. 6 shows a distortion curve of the imaging lens group of example one in the second state. Fig. 7 shows a chromatic aberration of magnification curve of the imaging lens group of the first example, which represents a deviation of different image heights on the image formation plane after light passes through the imaging lens group.

As can be seen from fig. 2 to 7, the imaging lens group given in example one can achieve good imaging quality.

Example two

As shown in fig. 8 to 14, an image pickup lens group of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 8 shows a schematic diagram of an image pickup lens group structure of example two.

As shown in fig. 8, the image capturing lens assembly sequentially includes, from the light incident side to the light emergent side: 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, a filter E8, and an image forming surface S20.

The first lens element E1 with positive refractive power has a convex surface S1 on the light-incident side and a convex surface S2 on the light-exit side. The third lens element E3 with positive refractive power has a convex surface S8 on the light-incident side and a convex surface S9 on the light-exit side. The fourth lens element E4 with negative refractive power has a convex surface S10 on the light-incident side and a concave surface S11 on the light-exit side. The fifth lens element E5 with negative refractive power has a convex surface S12 on the light incident side and a concave surface S13 on the light emergent side. The sixth lens element E6 with positive refractive power has a convex surface S14 on the light-incident side and a convex surface S15 on the light-exit side; the seventh lens element E7 with negative refractive power has a concave surface on a surface S16 thereof near the light incident side and a concave surface S17 thereof near the light emergent side; the filter E7 has a surface S18 close to the light entrance side and a surface S19 close to the light exit side. The light from the object sequentially passes through the respective surfaces S1 to S19 and is finally imaged on the imaging surface S20.

Table 6 shows a basic structural parameter table of the imaging lens group of example two in the first state, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 6

Table 7 shows a basic structural parameter table of the second lens in the second state of the image pickup lens group of example two, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	48.0000	0.0700	1.41	50.0
S4	Spherical surface	48.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1566

TABLE 7

Table 8 shows a basic structural parameter table of the second lens in the third state of the image pickup lens group of example two in which the units of the curvature radius, thickness/distance, focal length, and effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-70.0000	0.0700	1.41	50.0
S4	Spherical surface	-70.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1566

TABLE 8

Table 9 shows the effective focal length of the image pickup lens group and the effective focal length of the second lens in three states of the image pickup lens group of example two.

Example two	First state	Second state	Third state
				OBJ(mm)	2000.00	100.00	All-round
f(mm)	5.50	5.08	5.52
				f2(mm)	-275.22	165.09	-240.82
f/ft	-2.00	3.07	-2.29
				f5/f	-1.88	-2.04	-1.87
f4/f	-1.98	-2.14	-1.97

TABLE 9

Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Watch 10

Fig. 9 shows an on-axis chromatic aberration curve of the imaging lens group of example two, which indicates the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens group. Fig. 10 shows an astigmatism curve in the first state of the imaging lens group of the second example, which represents meridional field curvature and sagittal field curvature. Fig. 11 shows a distortion curve in the first state of the image pickup lens group of example two, which shows distortion magnitude values corresponding to different angles of view. Fig. 12 shows an astigmatism curve of the imaging lens group of example two in the second state. Fig. 13 shows a distortion curve of the imaging lens group of example two in the second state. Fig. 14 shows a chromatic aberration of magnification curve of the imaging lens group of the second example, which represents a deviation of different image heights on the image formation plane after light passes through the imaging lens group.

As can be seen from fig. 9 to 14, the imaging lens group according to example two can achieve good imaging quality.

Example III

As shown in fig. 15 to 21, an image pickup lens group of example three of the present application is described. Fig. 15 shows a schematic diagram of an image pickup lens group structure of example three.

As shown in fig. 15, the image capturing lens assembly sequentially includes, from the light incident side to the light emergent side: 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, a filter E8, and an image forming surface S20.

The first lens element E1 with positive refractive power has a convex surface S1 on the light-incident side and a convex surface S2 on the light-exit side. The third lens element E3 with positive refractive power has a convex surface S8 on the light-incident side and a convex surface S9 on the light-exit side. The fourth lens element E4 with negative refractive power has a convex surface S10 on the light-incident side and a concave surface S11 on the light-exit side. The fifth lens element E5 with negative refractive power has a concave surface S12 on the light incident side and a concave surface S13 on the light emergent side. The sixth lens element E6 with positive refractive power has a convex surface S14 on the light-incident side and a convex surface S15 on the light-exit side; the seventh lens element E7 with negative refractive power has a concave surface on a surface S16 thereof near the light incident side and a concave surface S17 thereof near the light emergent side; the filter E7 has a surface S18 close to the light entrance side and a surface S19 close to the light exit side. The light from the object sequentially passes through the respective surfaces S1 to S19 and is finally imaged on the imaging surface S20.

Table 11 shows a basic structural parameter table of the imaging lens group of example three in the first state, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 11

Table 12 shows a basic structural parameter table of the second lens in the second state of the image pickup lens group of example three, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	48.0000	0.0700	1.41	50.0
S4	Spherical surface	48.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1274

TABLE 12

Table 13 shows a basic structural parameter table of the second lens in the third state of the image pickup lens group of example three, in which the units of the curvature radius, thickness/distance, focal length, and effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-70.0000	0.0700	1.41	50.0
S4	Spherical surface	-70.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1274

Watch 13

Table 14 shows effective focal lengths of the image pickup lens group and the second lens in three states of the image pickup lens group of example three.

Example III	First state	Second state	Third state
				OBJ(mm)	2000.00	100.00	All-round
f(mm)	5.58	5.14	5.61
				f2(mm)	-275.22	165.09	-240.82
f/ft	-2.03	3.11	-2.33
				f5/f	-1.49	-1.61	-1.48
f4/f	-1.97	-2.14	-1.96

TABLE 14

Table 15 shows the high-order term coefficients that can be used for each aspherical mirror surface in example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.1100E-01

-1.0789E-02

1.2783E-04

-1.1892E-04

9.8997E-05

-7.2724E-05

4.0678E-05

S2

-9.4293E-02

-4.5228E-03

3.0146E-04

-2.1415E-04

8.4269E-05

-5.0815E-05

3.6931E-05

S8

2.1941E-02

1.2147E-02

-5.8445E-05

-3.2962E-05

-1.8872E-04

3.7649E-05

-6.1051E-05

S9

-3.4062E-02

9.2243E-03

-5.5539E-05

-5.7495E-04

-1.0306E-04

1.4416E-04

-1.0744E-04

S10

-1.8761E-02

-2.8504E-03

9.8401E-04

-1.3967E-03

3.4942E-05

2.1618E-04

-1.4680E-04

S11

2.1780E-02

1.5633E-03

3.1710E-03

-5.8050E-04

1.5531E-04

1.8846E-04

-6.6901E-05

S12

-2.1489E-01

2.1943E-04

-1.3863E-02

-4.6044E-03

-2.6906E-03

-8.5738E-05

6.1582E-04

S13

-9.5784E-01

1.3943E-01

-1.6733E-02

-4.6849E-03

-7.4120E-03

2.4479E-03

1.6836E-03

S14

-1.3732E+00

-2.7979E-02

7.2522E-02

5.3015E-02

3.4075E-03

-1.4389E-02

-9.9444E-03

S15

-5.8802E-01

4.0146E-02

4.8489E-02

-2.4090E-02

1.1589E-02

6.5657E-03

1.2848E-03

S16

-3.2196E-01

7.1244E-01

-4.1411E-01

1.5518E-01

-1.2983E-02

-2.4763E-02

1.5622E-02

S17

-4.4854E+00

8.1758E-01

-2.0242E-01

5.7104E-02

-3.9117E-02

5.6837E-03

-7.4164E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.6421E-05

2.2360E-05

-1.1458E-05

8.1251E-06

-1.2079E-05

8.5296E-06

-2.0501E-06

S2

-3.4405E-05

1.0715E-05

-8.9953E-06

1.4616E-05

-7.3332E-06

3.8717E-06

-4.4842E-07

S8

4.9855E-06

-2.2285E-05

9.8960E-06

8.1442E-06

1.7681E-05

-3.5188E-06

-4.3480E-06

S9

4.6727E-05

-3.5203E-05

2.7533E-06

-1.5786E-05

3.0945E-07

-1.8341E-06

6.7441E-06

S10

6.1492E-05

-4.2839E-05

8.0902E-06

-8.6724E-06

6.8154E-06

-5.9410E-07

1.0782E-06

S11

3.1253E-05

-1.4707E-05

2.1244E-06

1.5830E-06

1.1744E-06

-4.2995E-07

-3.8466E-06

S12

2.4633E-04

-8.4081E-05

-3.3698E-04

-3.0157E-04

-2.3853E-04

-1.1454E-04

-4.9011E-05

S13

-7.4970E-04

-1.5205E-03

-5.1832E-04

4.5310E-04

5.9155E-04

3.3780E-04

7.8487E-05

S14

-9.6223E-04

2.8398E-03

2.1256E-03

5.7076E-04

-2.8265E-04

-2.9235E-04

-9.6308E-05

S15

-2.2231E-03

-1.8932E-03

-5.9824E-04

-4.2552E-04

-7.2071E-04

-2.9154E-04

-1.8238E-04

S16

4.8228E-04

-5.6576E-03

3.1656E-03

-4.1207E-04

-1.4157E-03

4.2310E-04

-5.3282E-04

S17

4.0893E-03

9.0873E-04

-3.8770E-04

-9.3886E-04

-1.4074E-03

2.6776E-05

2.9116E-05

Watch 15

Fig. 16 shows on-axis chromatic aberration curves of the image pickup lens group of example three, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the image pickup lens group. Fig. 17 shows astigmatism curves representing meridional field curvature and sagittal field curvature in the first state of the imaging lens group of example three. Fig. 18 shows a distortion curve in the first state of the image pickup lens group of example three, which shows distortion magnitude values corresponding to different angles of view. Fig. 19 shows an astigmatism curve of an imaging lens group of example three in the second state. Fig. 20 shows a distortion curve of the imaging lens group of example three in the second state. Fig. 21 shows a chromatic aberration of magnification curve of the imaging lens group of example three, which represents a deviation of different image heights on an image formation plane after light passes through the imaging lens group.

As can be seen from fig. 16 to 21, the imaging lens group given in example three can achieve good imaging quality.

Example four

As shown in fig. 22 to 28, an image pickup lens group of the present example four is described. Fig. 22 shows a schematic diagram of an image pickup lens group structure of example four.

As shown in fig. 22, the image capturing lens assembly sequentially includes, from the light incident side to the light emergent side: 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, a filter E8, and an image forming surface S20.

The first lens element E1 with positive refractive power has a convex surface S1 on the light-incident side and a convex surface S2 on the light-exit side. The third lens element E3 with positive refractive power has a convex surface S8 on the light-incident side and a convex surface S9 on the light-exit side. The fourth lens element E4 with negative refractive power has a convex surface S10 on the light-incident side and a concave surface S11 on the light-exit side. The fifth lens element E5 with negative refractive power has a concave surface S12 on the light incident side and a concave surface S13 on the light emergent side. The sixth lens element E6 with positive refractive power has a convex surface S14 on the light incident side and a concave surface S15 on the light emergent side; the seventh lens element E7 with negative refractive power has a concave surface on a surface S16 thereof near the light incident side and a concave surface S17 thereof near the light emergent side; the filter E7 has a surface S18 close to the light entrance side and a surface S19 close to the light exit side. The light from the object sequentially passes through the respective surfaces S1 to S19 and is finally imaged on the imaging surface S20.

Table 16 shows a basic structural parameter table of the imaging lens group of example four in the first state, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 16

Table 17 shows a basic structural parameter table of the second lens in the second state of the image pickup lens group of example four in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	48.0000	0.0700	1.41	50.0
S4	Spherical surface	48.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1297

TABLE 17

Table 18 shows a basic structural parameter table of the second lens in the third state of the image pickup lens group of example four in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-70.0000	0.0700	1.41	50.0
S4	Spherical surface	-70.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1297

Watch 18

Table 19 shows effective focal lengths of the image pickup lens group and the second lens in three states of the image pickup lens group of example four.

Example four	First state	Second state	Third state
				OBJ(mm)	2000.00	100.00	All-round
f(mm)	5.58	5.14	5.61
				f2(mm)	-275.22	165.09	-240.82
f/ft	-2.03	3.11	-2.33
				f5/f	-1.63	-1.77	-1.62
f4/f	-2.07	-2.25	-2.06

Watch 19

Table 20 shows the high-order term coefficients that can be used for each aspherical mirror surface in example four, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.1875E-01

-1.1264E-02

3.9559E-05

-7.7253E-05

6.8700E-05

-5.5875E-05

3.2850E-05

S2

-1.0286E-01

-4.6988E-03

2.4262E-04

-2.3342E-04

7.6748E-05

-5.1390E-05

3.5628E-05

S8

2.5561E-02

1.3305E-02

-7.3729E-04

-4.4439E-04

-3.6237E-04

3.6032E-06

-7.3342E-05

S9

-3.3678E-02

9.3659E-03

-7.0516E-04

-9.5268E-04

-2.4913E-04

1.5934E-04

-1.6272E-04

S10

-1.8772E-02

-2.7883E-03

2.4955E-04

-1.7701E-03

-1.4267E-04

2.5759E-04

-2.3483E-04

S11

2.3192E-02

2.4514E-03

3.3760E-03

-6.6369E-04

1.2539E-04

2.1198E-04

-9.0064E-05

S12

-1.6655E-01

7.8427E-03

-6.2020E-03

2.3514E-04

-1.2221E-03

-3.4078E-04

-1.5842E-04

S13

-7.5365E-01

9.7711E-02

-1.0428E-02

6.2798E-03

-4.7381E-03

-5.7342E-04

-4.3680E-05

S14

-1.2165E+00

-5.2420E-02

1.8777E-02

3.8612E-02

1.4801E-02

3.4821E-04

-4.5319E-03

S15

-7.6585E-01

6.1629E-02

3.8080E-02

-2.4738E-02

2.4581E-03

2.8465E-03

1.9125E-03

S16

-5.4924E-01

6.8507E-01

-3.2020E-01

7.4561E-02

1.7335E-02

-1.9962E-02

1.4962E-03

S17

-3.9930E+00

7.4224E-01

-1.5128E-01

4.7476E-02

-2.1877E-02

5.8470E-03

-8.9230E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.7502E-05

1.7995E-05

-1.0412E-05

3.6861E-06

-1.0021E-05

8.2217E-06

-1.8727E-06

S2

-3.0020E-05

1.7421E-05

-4.4228E-06

1.4599E-05

-6.2556E-06

3.2331E-06

-3.3207E-06

S8

2.5074E-05

-1.1208E-06

3.3009E-05

1.0263E-05

5.2224E-06

-1.3487E-05

-5.5321E-06

S9

5.1940E-05

-5.7200E-05

-3.0804E-06

-1.8028E-05

5.3650E-06

6.0539E-06

1.0158E-05

S10

7.5870E-05

-6.2878E-05

1.7893E-05

-7.5225E-06

1.2128E-05

-1.9570E-06

3.6335E-06

S11

2.4433E-05

-1.4642E-05

-3.2027E-06

3.5752E-06

-3.9037E-06

-1.2159E-07

-6.2428E-06

S12

-3.5828E-06

9.8317E-06

9.1858E-06

6.5777E-06

3.1152E-06

-1.9669E-06

-1.3615E-06

S13

6.3274E-04

1.7761E-04

1.6098E-05

-7.6805E-05

-3.9807E-05

-1.3427E-05

5.6086E-06

S14

-2.8295E-03

-6.6747E-04

2.7946E-04

3.7902E-04

1.2904E-04

-6.8051E-06

-4.5224E-05

S15

1.6295E-04

-6.2722E-04

8.7499E-05

2.0773E-04

-3.8450E-05

2.7532E-05

-4.6891E-05

S16

6.5213E-03

-4.0228E-03

2.2239E-04

1.0289E-03

-7.7001E-04

2.5812E-04

-2.7976E-05

S17

1.8738E-03

1.2869E-03

5.9611E-04

4.6224E-04

-6.8104E-04

9.2325E-06

7.3831E-05

Watch 20

Fig. 23 shows an on-axis chromatic aberration curve of an imaging lens group of example four, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the imaging lens group. Fig. 24 shows an astigmatism curve in the first state of the imaging lens group of the fourth example, which represents meridional field curvature and sagittal field curvature. Fig. 25 shows a distortion curve in the first state of the image pickup lens group of example four, which shows distortion magnitude values corresponding to different angles of view. Fig. 26 shows an astigmatism curve of the imaging lens group of example four in the second state. Fig. 27 shows a distortion curve of the imaging lens group of example four in the second state. Fig. 28 shows a chromatic aberration of magnification curve of the imaging lens group of example four, which represents a deviation of different image heights on the image formation plane after light passes through the imaging lens group.

As can be seen from fig. 23 to 28, the imaging lens group given in example four can achieve good imaging quality.

Example five

As shown in fig. 29 to 35, an image pickup lens group of example five of the present application is described. Fig. 29 shows a schematic diagram of an image pickup lens group structure of example five.

As shown in fig. 29, the image capturing lens assembly sequentially includes, from the light incident side to the light emitting side: 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, a filter E8, and an image forming surface S20.

The first lens element E1 with positive refractive power has a convex surface S1 on the light-incident side and a concave surface S2 on the light-exit side. The third lens element E3 with positive refractive power has a convex surface S8 on the light-incident side and a convex surface S9 on the light-exit side. The fourth lens element E4 with negative refractive power has a convex surface S10 on the light-incident side and a concave surface S11 on the light-exit side. The fifth lens element E5 with negative refractive power has a concave surface S12 on the light incident side and a concave surface S13 on the light emergent side. The sixth lens element E6 with positive refractive power has a convex surface S14 on the light-incident side and a convex surface S15 on the light-exit side; the seventh lens element E7 with negative refractive power has a concave surface on a surface S16 thereof near the light incident side and a concave surface S17 thereof near the light emergent side; the filter E7 has a surface S18 close to the light entrance side and a surface S19 close to the light exit side. The light from the object sequentially passes through the respective surfaces S1 to S19 and is finally imaged on the imaging surface S20.

Table 21 shows a basic structural parameter table in the first state of the imaging lens group of example five in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Table 22 shows a basic structural parameter table of the second lens in the second state of the image pickup lens group of example five in which the units of the curvature radius, thickness/distance, focal length, and effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	48.0000	0.0700	1.41	50.0
S4	Spherical surface	48.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1324

TABLE 22

Table 23 shows a basic structural parameter table of the second lens in the third state of the image pickup lens group of example five in which the units of the curvature radius, thickness/distance, focal length, and effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-70.0000	0.0700	1.41	50.0
S4	Spherical surface	-70.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1324

TABLE 23

Table 24 shows the effective focal lengths of the image pickup lens groups and the effective focal length of the second lens in three states of the image pickup lens group of example five.

Examples of the present inventionFive of them	First state	Second state	Third state
				OBJ(mm)	2000.00	100.00	All-round
f(mm)	5.64	5.21	5.67
				f2(mm)	-275.22	165.09	-240.82
f/ft	-2.05	3.15	-2.35
				f5/f	-1.54	-1.67	-1.54
f4/f	-2.06	-2.23	-2.05

Watch 24

Table 25 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 25

Fig. 30 shows an on-axis chromatic aberration curve of an imaging lens group of example five, which represents a convergent focus deviation of light rays of different wavelengths after passing through the imaging lens group. Fig. 31 shows an astigmatism curve in the first state, which represents meridional field curvature and sagittal field curvature, of the imaging lens group of example five. Fig. 32 shows a distortion curve in the first state of the image pickup lens group of example five, which shows distortion magnitude values corresponding to different angles of view. Fig. 33 shows an astigmatism curve of an imaging lens group of example five in the second state. Fig. 34 shows a distortion curve of the imaging lens group of example five in the second state. Fig. 35 shows a chromatic aberration of magnification curve of the imaging lens group of example five, which represents a deviation of different image heights on an image formation plane after light passes through the imaging lens group.

As can be seen from fig. 30 to 35, the imaging lens group given in example five can achieve good imaging quality.

Example six

As shown in fig. 36 to 42, an image pickup lens group of example six of the present application is described. Fig. 36 shows a schematic diagram of an image pickup lens group structure of example six.

As shown in fig. 36, the image capturing lens assembly sequentially includes, from the light incident side to the light emergent side: 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, a filter E8, and an image forming surface S20.

The first lens element E1 with positive refractive power has a convex surface S1 on the light-incident side and a concave surface S2 on the light-exit side. The third lens element E3 with positive refractive power has a convex surface S8 on the light-incident side and a convex surface S9 on the light-exit side. The fourth lens element E4 with negative refractive power has a convex surface S10 on the light-incident side and a concave surface S11 on the light-exit side. The fifth lens element E5 with negative refractive power has a convex surface S12 on the light incident side and a concave surface S13 on the light emergent side. The sixth lens element E6 with positive refractive power has a convex surface S14 on the light incident side and a concave surface S15 on the light emergent side; the seventh lens element E7 with negative refractive power has a concave surface on a surface S16 thereof near the light incident side and a concave surface S17 thereof near the light emergent side; the filter E7 has a surface S18 close to the light entrance side and a surface S19 close to the light exit side. The light from the object sequentially passes through the respective surfaces S1 to S19 and is finally imaged on the imaging surface S20.

Table 26 shows a basic structural parameter table in the first state of the imaging lens group of example six, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Watch 26

Table 27 shows a basic structural parameter table of the second lens in the second state of the image pickup lens group of example six in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	48.0000	0.0700	1.41	50.0
S4	Spherical surface	48.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1492

Watch 27

Table 28 shows a basic structural parameter table of the second lens in the third state of the image pickup lens group of example six in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-70.0000	0.0700	1.41	50.0
S4	Spherical surface	-70.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1492

Watch 28

Table 29 shows effective focal lengths of the image pickup lens group and the second lens in three states of the image pickup lens group of example six.

Example six	First state	Second state	Third state
				OBJ(mm)	2000.00	100.00	All-round
f(mm)	5.66	5.22	5.69
				f2(mm)	-275.22	165.09	-240.82
f/ft	-2.06	3.16	-2.36
				f5/f	-1.82	-1.98	-1.81
f4/f	-2.18	-2.36	-2.17

Watch 29

Table 30 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Watch 30

Fig. 37 shows an on-axis chromatic aberration curve of an imaging lens group of example six, which represents a convergent focus deviation of light rays of different wavelengths after passing through the imaging lens group. Fig. 38 shows an astigmatism curve in the first state, which represents a meridional field curvature and a sagittal field curvature, of the imaging lens group of example six. Fig. 39 shows a distortion curve in the first state of the image pickup lens group of example six, which shows distortion magnitude values corresponding to different angles of view. Fig. 40 shows an astigmatism curve in the second state of the imaging lens group of example six. Fig. 41 shows a distortion curve in the second state of the imaging lens group of example six. Fig. 42 shows a chromatic aberration of magnification curve of the imaging lens group of example six, which represents a deviation of different image heights on an image formation plane after light passes through the imaging lens group.

As can be seen from fig. 37 to 42, the imaging lens group given in example six can achieve good image quality.

Example seven

As shown in fig. 43 to 49, an image pickup lens group of example seven of the present application is described. Fig. 43 shows a schematic diagram of an image pickup lens group structure of example seven.

As shown in fig. 43, the image capturing lens assembly sequentially includes, from the light incident side to the light emitting side: 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, a filter E8, and an image forming surface S20.

The first lens element E1 with positive refractive power has a convex surface S1 on the light-incident side and a concave surface S2 on the light-exit side. The third lens element E3 with positive refractive power has a convex surface S8 on the light-incident side and a convex surface S9 on the light-exit side. The fourth lens element E4 with negative refractive power has a convex surface S10 on the light-incident side and a concave surface S11 on the light-exit side. The fifth lens element E5 with negative refractive power has a concave surface S12 on the light incident side and a concave surface S13 on the light emergent side. The sixth lens element E6 with positive refractive power has a convex surface S14 on the light incident side and a concave surface S15 on the light emergent side; the seventh lens element E7 with negative refractive power has a concave surface on a surface S16 thereof near the light incident side and a concave surface S17 thereof near the light emergent side; the filter E7 has a surface S18 close to the light entrance side and a surface S19 close to the light exit side. The light from the object sequentially passes through the respective surfaces S1 to S19 and is finally imaged on the imaging surface S20.

Table 31 shows a basic structural parameter table in the first state of the imaging lens group of example seven, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Watch 31

Table 32 shows a basic structural parameter table of the second lens in the second state of the image pickup lens group of example seven, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	48.0000	0.0700	1.41	50.0
S4	Spherical surface	48.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1454

Watch 32

Table 33 shows a basic structural parameter table of the second lens in the third state of the imaging lens group of example seven, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	-70.0000	0.0700	1.41	50.0
S4	Spherical surface	-70.0000	0.2000	1.29	100.0
							S5	Spherical surface	All-round	0.0200	1.41	50.0
S6	Spherical surface	All-round	0.2100	1.52	64.2
							S7	Spherical surface	All-round	0.1454

Watch 33

Table 34 shows the effective focal length of the image pickup lens group and the effective focal length of the second lens in three states for the image pickup lens group of example seven.

Example seven	First state	Second state	Third state
				OBJ(mm)	2000.00	100.00	All-round
f(mm)	5.62	5.17	5.64
				f2(mm)	-275.22	165.09	-240.82
f/ft	-2.04	3.13	-2.34
				f5/f	-1.46	-1.59	-1.46
f4/f	-2.28	-2.48	-2.27

Watch 34

Table 35 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example seven, wherein each of the aspherical mirror surface types can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.1575E-01

-1.2566E-02

-1.0707E-03

1.0374E-04

-5.7395E-05

2.7225E-05

-1.9267E-05

S2

-9.8953E-02

-6.1802E-03

-4.6839E-04

3.1875E-05

-6.2371E-05

3.2254E-05

-2.2781E-05

S8

1.0339E-02

1.0663E-02

9.0009E-04

7.9643E-06

-9.4405E-05

1.9405E-05

-1.1910E-05

S9

-3.3618E-02

1.0152E-02

4.1603E-04

-5.6536E-04

-1.6766E-04

1.0274E-04

-8.7697E-05

S10

-1.8290E-02

-3.5650E-03

-6.4817E-04

-1.2795E-03

-3.0992E-04

2.2042E-04

-1.5754E-04

S11

2.2927E-02

9.5629E-04

2.2841E-03

-3.9466E-04

2.4186E-05

2.0299E-04

-5.1273E-05

S12

-1.6958E-01

4.0410E-03

-8.1247E-03

-9.9798E-04

-1.8623E-03

-6.7104E-04

-3.6308E-04

S13

-8.4398E-01

1.1265E-01

-1.4331E-02

5.3036E-03

-6.4210E-03

-2.9357E-04

2.1149E-04

S14

-1.2788E+00

-3.6729E-02

2.6948E-02

4.1986E-02

1.2683E-02

-1.8680E-03

-5.3889E-03

S15

-8.4869E-01

7.5664E-02

3.9437E-02

-2.5581E-02

9.8500E-04

4.7880E-03

2.5840E-03

S16

-5.8919E-01

6.7100E-01

-2.9594E-01

5.8388E-02

2.1718E-02

-1.7219E-02

-1.8697E-03

S17

-3.8291E+00

7.1474E-01

-1.6048E-01

4.6393E-02

-1.4259E-02

5.2968E-03

-9.2019E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.7598E-05

-2.7020E-06

6.8632E-06

-5.8076E-06

-3.7228E-06

-3.9031E-06

3.8808E-06

S2

5.2781E-06

-1.5182E-05

9.6429E-06

5.6696E-07

2.8800E-06

-2.4315E-06

1.8289E-06

S8

8.5815E-06

-7.3075E-06

-9.6631E-07

3.1186E-06

1.2280E-05

4.8651E-06

-2.3172E-06

S9

3.6618E-05

-9.6938E-06

1.0570E-06

4.0095E-06

1.0447E-06

4.4495E-06

2.1509E-06

S10

6.2308E-05

-3.7491E-05

8.4870E-06

-3.3997E-07

9.3608E-06

7.0526E-07

1.1159E-06

S11

2.2477E-05

-7.6153E-06

-4.2082E-06

5.9900E-06

-4.3120E-06

-3.7385E-06

-1.0737E-05

S12

-1.2626E-04

-7.2502E-05

-2.8993E-05

-1.1332E-05

5.4992E-07

2.3519E-06

2.0494E-06

S13

6.7905E-04

-7.0412E-05

-1.2174E-04

-1.3596E-04

-2.4861E-05

1.1463E-06

1.8636E-05

S14

-2.6289E-03

-4.0764E-04

3.5494E-04

3.5624E-04

1.1649E-04

1.0327E-05

-3.2384E-05

S15

-1.9554E-04

-8.9432E-04

1.5810E-04

2.8028E-04

-2.0444E-05

-2.3202E-05

-4.1910E-05

S16

6.2582E-03

-2.5688E-03

-5.1479E-04

8.2536E-04

-3.6866E-04

5.4144E-05

-3.0808E-06

S17

1.3972E-03

7.9608E-04

2.6500E-04

-2.8654E-04

-7.8084E-04

3.3498E-05

1.5813E-04

Watch 35

Fig. 44 shows an on-axis chromatic aberration curve of an imaging lens group of example seven, which represents a convergent focus deviation of light rays of different wavelengths after passing through the imaging lens group. Fig. 45 shows an astigmatism curve in the first state, which represents a meridional field curvature and a sagittal field curvature, of the imaging lens group of example seven. Fig. 46 shows a distortion curve in the first state of the image pickup lens group of example seven, which represents distortion magnitude values corresponding to different angles of view. Fig. 47 shows an astigmatism curve in the second state of the imaging lens group of example seven. Fig. 48 shows a distortion curve in the second state of the imaging lens group of example seven. Fig. 49 shows a chromatic aberration of magnification curve of the imaging lens group of example seven, which represents a deviation of different image heights on an image formation plane after light passes through the imaging lens group.

As can be seen from fig. 44 to 49, the imaging lens group given in example seven can achieve good image quality.

To sum up, examples one to seven respectively satisfy the relationships shown in table 36.

Conditions/examples	1	2	3	4	5	6	7
								T67/T45	1.11	1.24	1.29	1.34	1.12	1.26	1.19
(fmax/fmin)*10	9.16	9.19	9.17	9.16	9.18	9.17	9.16
								ET7/ET6	1.67	1.74	1.95	2.20	2.03	1.81	2.10
∣ftmax/ftmin∣	0.60	0.60	0.60	0.60	0.60	0.60	0.60
								R10/R7	0.47	0.36	0.60	0.71	0.75	0.46	0.67
CT7/CT6	0.96	0.99	1.03	0.91	1.04	0.98	0.90
								ET4/CT4	2.00	2.03	2.14	2.09	2.07	2.06	2.02
SAG51/SAG41	-1.42	-1.42	-2.22	-2.07	-2.12	-1.43	-2.06
								T45/(T34+T23+T12)	1.46	1.38	1.51	1.52	1.42	1.15	1.35
CT4/CT3	0.44	0.46	0.42	0.42	0.44	0.51	0.43
								DT41/DT12	0.94	0.98	0.98	0.97	0.96	0.98	0.98
SAG52/SAG42	-0.92	-0.86	-1.08	-1.13	-1.24	-0.91	-1.27

Watch 36

Table 37 gives the effective focal lengths f1, f3 to f7 and TTL, ImgH, Semi-FOV of the respective lenses of example one to example seven.

Example parameters	1	2	3	4	5	6	7
								f1(mm)	6.91	6.72	6.67	6.64	6.81	6.90	6.87
f3(mm)	8.94	8.63	7.91	8.16	7.98	9.11	7.92
								f4(mm)	-11.71	-10.86	-10.98	-11.58	-11.62	-12.34	-12.81
f5(mm)	-10.21	-10.33	-8.30	-9.11	-8.72	-10.31	-8.23
								f6(mm)	5.33	5.16	4.92	5.67	5.12	5.53	5.59
f7(mm)	-3.96	-3.91	-3.73	-4.01	-3.90	-4.04	-4.02
								TTL(mm)	7.01	6.90	6.90	6.90	6.90	6.90	6.90
ImgH(mm)	5.30	5.30	5.30	5.30	5.30	5.30	5.30
								Semi-FOV	42.58	43.39	43.07	42.77	42.52	42.77	42.81
Fno	1.96	1.96	1.96	1.96	1.96	1.96	1.96

Watch 37

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 above-described image pickup lens group.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An image pickup lens group, characterized in that, the light incident side along the image pickup lens group to the light emergent side of the image pickup lens group includes in order:

a first lens element with refractive power;

a second lens element with refractive power;

a third lens element with refractive power;

the fourth lens element with negative refractive power has a convex surface on a surface thereof near the light incident side;

the fifth lens element with negative refractive power has a concave surface on the surface close to the light emitting side;

a sixth lens element with refractive power;

the seventh lens element with refractive power has a concave surface on a surface thereof near the light incident side;

wherein an effective focal length f4 of the fourth lens and an effective focal length f of the image pickup lens group satisfy: -3.3< f4/f < 0;

the imaging surface of the camera lens group satisfies the following condition that the ImgH which is half of the diagonal length of the effective pixel area is as follows: ImgH > 5.

2. The imaging lens group according to claim 1, wherein an effective semi-aperture diameter DT12 of a surface of the first lens closer to the light exit side and an effective semi-aperture diameter DT41 of a surface of the fourth lens closer to the light entrance side satisfy: DT41/DT12 <1.

3. The imaging lens group according to claim 1, wherein one of the first to seventh lenses is a variable focal length lens having a focal length ft satisfying: | ftmax/ftmin | <1.

4. An imaging lens group according to claim 1, wherein a minimum focal length fmin of said imaging lens group and a maximum focal length fmax of said imaging lens group satisfy: (fmax/fmin) 10 < 10.

5. The imaging lens group according to claim 1, wherein a curvature radius of a surface of the second lens closer to the light entrance side is variable, and a curvature radius R3 of the surface of the second lens closer to the light entrance side satisfies: | R3 | > 48 mm.

6. The imaging lens group according to claim 1, wherein one of the first to seventh lenses is a variable focal length lens having a focal length ft satisfying: 300< ft < 200.

7. The imaging lens group of claim 1, wherein a center thickness CT3 of the third lens on an optical axis of the imaging lens group and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.2 < CT4/CT 3< 0.8.

8. The imaging lens group of claim 1, wherein the fourth lens satisfies, between a center thickness CT4 on an optical axis of the imaging lens group and an edge thickness ET4 of the fourth lens: 1.5< ET4/CT 4< 2.5.

9. The imaging lens group according to claim 1, wherein an effective focal length f of the imaging lens group and an effective focal length f5 of the fifth lens satisfy: -2.5< f5/f < -1.

10. An image pickup lens group, characterized in that, the light incident side along the image pickup lens group to the light emergent side of the image pickup lens group includes in order:

a first lens element with refractive power;

a second lens element with refractive power;

a third lens element with refractive power;

a sixth lens element with refractive power;

the edge thickness ET7 of the seventh lens and the edge thickness ET6 of the sixth lens satisfy that: 1< ET7/ET6< 2.8.