CN113093371A

CN113093371A - Image pickup lens group

Info

Publication number: CN113093371A
Application number: CN202110414191.6A
Authority: CN
Inventors: 戴付建; 徐武超; 吴旭炯; 王金超; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-04-16
Filing date: 2021-04-16
Publication date: 2021-07-09
Anticipated expiration: 2041-04-16
Also published as: CN113093371B

Abstract

The invention provides a camera lens group. The image pickup lens group sequentially comprises from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens; a third lens having a positive optical power; a fourth lens; a fifth lens having a positive optical power; a sixth lens; a seventh lens having a negative optical power; the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the image pickup lens group and the maximum field angle FOV of the image pickup lens group satisfy the following condition: 5.5mm < TTL tan (FOV/3) <6.5 mm; the effective focal length f of the image pickup lens group, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy the following conditions: 1.5< f/(T23+ T34) < 3.5. The invention solves the problem of poor imaging quality of the camera lens group 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

With the rapid development of science and technology, the updating speed of electronic products is faster and faster, so that the requirement of people on the imaging quality of a consumer-grade camera lens group is higher and higher. However, as the portable electronic products will be miniaturized, and as the performance of the CCD and cmos image sensors is improved and the size thereof is reduced, higher requirements are correspondingly placed on the image pickup lens group. The imaging quality of the existing camera lens group is difficult to satisfy users.

That is, the image pickup lens group in the related art has a problem of poor image quality.

Disclosure of Invention

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

In order to achieve the above object, according to one aspect of the present invention, there is provided an image capturing lens group comprising, in order from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens; a third lens having a positive optical power; a fourth lens; a fifth lens having a positive optical power; a sixth lens; a seventh lens having a negative optical power; the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the image pickup lens group and the maximum field angle FOV of the image pickup lens group satisfy the following condition: 5.5mm < TTL tan (FOV/3) <6.5 mm; the effective focal length f of the image pickup lens group, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy the following conditions: 1.5< f/(T23+ T34) < 3.5.

Further, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: -3.0< (f6-f5)/f7 is less than or equal to-1.0.

Further, an effective focal length f5 of the image pickup lens group and an effective focal length f5 of the fifth lens satisfy: f/f5 is more than or equal to 0.9 and less than 1.2.

Further, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 2.5< f1/f3 is less than or equal to-0.9.

Further, the effective focal length f of the image pickup lens group and the center thickness CT5 of the fifth lens satisfy: 2.0< f/CT5< 3.0.

Further, the effective focal length f of the image pickup lens group and the center thickness CT3 of the third lens satisfy: 2.0< f/CT3< 3.0.

Further, the effective focal length f of the imaging lens group, the center thickness CT3 of the third lens, and the center thickness CT6 of the sixth lens satisfy: 3.5< f/(CT3-CT6) < 5.0.

Further, an effective focal length f of the image pickup lens group and an air space T12 on the optical axis between the first lens and the second lens satisfy: 3.0< f/T12< 4.0.

Further, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: CT3/(CT1+ CT2) is not less than 1.0 and not more than 1.5.

Further, an average value DT3 of the entrance pupil diameter EPD of the image pickup lens group and the maximum effective radii of the object side surface of the third lens and the image side surface of the third lens satisfies: 0.9< EPD/DT3 is less than or equal to 1.2.

Further, the average value DT6 of the maximum effective radii of the object side surface of the sixth lens and the image side surface of the sixth lens, and the average value DT7 of the maximum effective radii of the object side surface of the seventh lens and the image side surface of the seventh lens satisfy: 2.0< DT7/(DT7-DT6) < 2.8.

Further, the average value DT1 of the maximum effective radii of the object side surface of the first lens and the image side surface of the first lens, the average value DT3 of the maximum effective radii of the object side surface of the third lens and the image side surface of the third lens and the maximum effective radius DTs of the diaphragm satisfy: 2.0 ≦ (DT1-DT3)/DTs < 2.8.

Further, the effective focal length f of the image pickup lens group and the radius of curvature R1 of the object side surface of the first lens satisfy: f/R1 is less than or equal to-0.5 and less than-1.0.

Further, the effective focal length f of the image pickup lens group and the curvature radius R14 of the image side surface of the seventh lens satisfy: 1.5< f/R14< 2.5.

Further, the abbe number V5 of the fifth lens, the abbe number V6 of the sixth lens and the abbe number V7 of the seventh lens satisfy: v5- (V6+ V7) < 20.

Further, an on-axis distance TTL from the object side surface of the first lens to the imaging surface of the image pickup lens group and an effective focal length f of the image pickup lens group satisfy: 2.5< TTL/f < 3.5.

Further, the optical distortion ODT of the image pickup lens group satisfies: i ODT | max < 5%.

According to another aspect of the present invention, there is provided an image pickup lens group comprising, in order from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens; a third lens having a positive optical power; a fourth lens; a fifth lens having a positive optical power; a sixth lens; a seventh lens having a negative optical power; the effective focal length f of the image pickup lens group, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy the following conditions: 1.5< f/(T23+ T34) < 3.5; the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -3.0< (f6-f5)/f7 is less than or equal to-1.0.

Further, an on-axis distance TTL from the object side surface of the first lens to the imaging surface of the image pickup lens group and a maximum field angle FOV of the image pickup lens group satisfy: 5.5mm < TTL tan (FOV/3) <6.5 mm; the effective focal length f of the image pickup lens group and the effective focal length f5 of the fifth lens satisfy: f/f5 is more than or equal to 0.9 and less than 1.2.

By applying the technical scheme of the invention, the image pickup 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 an object side to an image side along an optical axis, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens have negative focal power. The on-axis distance TTL from the object side surface of the first lens to the imaging surface of the image pickup lens group and the maximum field angle FOV of the image pickup lens group satisfy the following condition: 5.5mm < TTL tan (FOV/3) <6.5 mm; the effective focal length f of the image pickup lens group, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy the following conditions: 1.5< f/(T23+ T34) < 3.5.

Through reasonable distribution of focal power, astigmatism and distortion can be effectively reduced, and the imaging quality of the camera lens group is greatly improved. The on-axis distance TTL from the object side surface of the first lens to the imaging surface of the shooting lens group and the conditional expression of the maximum field angle FOV of the shooting lens group are reasonably controlled within a reasonable range, so that the total length of the system can be controlled, the field angle can be increased, and the shooting space of the shooting lens group can be increased while the miniaturization is guaranteed. By reasonably restricting the relationship among the effective focal length f of the shooting lens group, the air space T23 between the second lens and the third lens on the optical axis, and the air space T34 between the third lens and the fourth lens on the optical axis, the field curvature contribution of each field of view of the system is controlled within a reasonable range, so that the field curvature contribution generated by other lenses is balanced, and the image resolving power of the shooting lens group is effectively improved.

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 4 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens group in fig. 1;

fig. 5 is a schematic view showing a configuration of an image pickup lens group according to a second example of the present invention;

fig. 6 to 8 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens group in fig. 5;

fig. 9 is a schematic view showing a configuration of an image pickup lens group according to a third example of the present invention;

fig. 10 to 12 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens group in fig. 9;

fig. 13 is a schematic view showing a configuration of an image pickup lens group of example four of the present invention;

fig. 14 to 16 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens group in fig. 13;

fig. 17 is a schematic view showing a configuration of an image pickup lens group of example five of the present invention;

fig. 18 to 20 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens group in fig. 17;

fig. 21 is a schematic view showing a configuration of an image pickup lens group of example six of the present invention;

fig. 22 to 24 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens group in fig. 21;

fig. 25 is a schematic view showing a configuration of an image pickup lens group of example seven of the present invention;

fig. 26 to 28 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens group in fig. 25.

Wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the object side surface of the first lens; s2, an image side surface of the first lens; e2, second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, third lens; s5, the object side surface of the third lens; s6, an image side surface of the third lens; e4, fourth lens; s7, the object side surface of the fourth lens; s8, an image side surface of the fourth lens element; e5, fifth lens; s9, the object side surface of the fifth lens; s10, an image side surface of the fifth lens element; e6, sixth lens; s11, the object-side surface of the sixth lens element; s12, an image side surface of the sixth lens element; e7, seventh lens; s13, an object-side surface of the seventh lens; s14, an image side surface of the seventh lens element; e8, optical filters; s15, the object side surface of the optical filter; s16, the image side surface of the optical filter; and S17, 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 object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. 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 invention provides a camera lens group, aiming at solving the problem of poor imaging quality of the camera lens group in the prior art.

Example one

As shown in fig. 1 to 28, the image pickup lens group includes, in order from the object side to the image side along the optical axis, a first lens E1 having negative power, a second lens E2, a third lens E3 having positive power, a fourth lens E4, a fifth lens E5 having positive power, a sixth lens E6, and a seventh lens E7 having negative power. The on-axis distance TTL from the object side surface of the first lens to the imaging surface of the image pickup lens group and the maximum field angle FOV of the image pickup lens group satisfy the following condition: 5.5mm < TTL tan (FOV/3) <6.5 mm; the effective focal length f of the image pickup lens group, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy the following conditions: 1.5< f/(T23+ T34) < 3.5.

Preferably, an on-axis distance TTL from the object-side surface of the first lens to the imaging surface of the image pickup lens group and a maximum field angle FOV of the image pickup lens group satisfy: 5.7mm < TTL tan (FOV/3) <6.2 mm.

Preferably, the effective focal length f of the image pickup lens group, the air space T23 between the second lens and the third lens on the optical axis, and the air space T34 between the third lens and the fourth lens on the optical axis satisfy: 1.8< f/(T23+ T34) < 2.6.

In the present embodiment, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: -3.0< (f6-f5)/f7 is less than or equal to-1.0. Preferably, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: 2.8< - (f6-f5)/f7 is less than or equal to-1.0. By reasonably controlling the conditional expressions in a reasonable range, the contribution amounts of the fifth lens E5, the sixth lens E6 and the seventh lens E7 to the aberration of the whole optical system can be effectively controlled, the off-axis aberration of the system can be balanced, and the imaging quality of the imaging lens group is improved.

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: f/f5 is more than or equal to 0.9 and less than 1.2. Preferably, an effective focal length f5 of the image pickup lens group and an effective focal length f5 of the fifth lens satisfy: f/f5 is more than or equal to 0.9 and less than or equal to 1.1. By controlling the ratio of the effective focal length f of the imaging lens group to the effective focal length f5 of the fifth lens to be within a reasonable range, the contribution amount of the fifth lens E5 to the entire aberration can be reasonably distributed.

In the present embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 2.5< f1/f3 is less than or equal to-0.9. Preferably, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: f1/f3 is more than or equal to-2.2 and less than or equal to-0.9. By restricting the ratio of the effective focal length f1 of the first lens to the effective focal length f3 of the third lens within a reasonable range, the curvature of field of the imaging lens group can be reasonably controlled within a certain range.

In the present embodiment, the effective focal length f of the imaging lens group and the center thickness CT5 of the fifth lens satisfy: 2.0< f/CT5< 3.0. Preferably, the effective focal length f of the image pickup lens group and the center thickness CT5 of the fifth lens satisfy: 2.1< f/CT5< 2.5. By controlling the ratio of the effective focal length f of the image pickup lens group to the central thickness CT5 of the fifth lens element within a reasonable range, it is advantageous to control the influence of the third lens element E3 on the overall aberration.

In the present embodiment, the effective focal length f of the imaging lens group and the center thickness CT3 of the third lens satisfy: 2.0< f/CT3< 3.0. Preferably, the effective focal length f of the image pickup lens group and the center thickness CT3 of the third lens satisfy: 2.3< f/CT3< 2.7. By controlling the ratio of the effective focal length f of the image pickup lens group to the central thickness CT3 of the third lens within a reasonable range, the contribution of the third lens E3 to the system coma is favorably and reasonably controlled.

In the present embodiment, the effective focal length f of the imaging lens group, the center thickness CT3 of the third lens, and the center thickness CT6 of the sixth lens satisfy: 3.5< f/(CT3-CT6) < 5.0. Preferably, the effective focal length f of the imaging lens group, the center thickness CT3 of the third lens and the center thickness CT6 of the sixth lens satisfy: 3.8< f/(CT3-CT6) < 4.5. By controlling the conditional expressions in a reasonable range, the coma aberration of the system can be reasonably controlled, and the shooting lens group has good optical performance.

In the present embodiment, the effective focal length f of the image pickup lens group and the air interval T12 on the optical axis between the first lens and the second lens satisfy: 3.0< f/T12< 4.0. Preferably, an effective focal length f of the image pickup lens group and an air space T12 on the optical axis between the first lens and the second lens satisfy: 3.1< f/T12< 3.6. The influence of the first lens E1 on the curvature of field of the system can be effectively controlled by reasonably controlling the range of the ratio of the effective focal length f of the shooting lens group to the air interval T12 of the first lens and the second lens on the optical axis.

In the present embodiment, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens satisfy: CT3/(CT1+ CT2) is not less than 1.0 and not more than 1.5. By controlling the conditional expressions in a reasonable range, the distortion contribution of each field of view of the system can be favorably controlled in a reasonable range, so that the imaging quality is improved.

In the present embodiment, an average value DT3 of the entrance pupil diameter EPD of the imaging lens group and the maximum effective radii of the object-side surface of the third lens and the image-side surface of the third lens satisfies: 0.9< EPD/DT3 is less than or equal to 1.2. The ratio of the entrance pupil diameter EPD of the shooting lens group to the average DT3 of the maximum effective radiuses of the object side surface of the third lens and the image side surface of the third lens is restrained within a reasonable range, so that the front end size of the shooting lens group is favorably reduced, and miniaturization is guaranteed.

In the present embodiment, an average value DT6 of maximum effective radii of the object-side surface of the sixth lens and the image-side surface of the sixth lens, and an average value DT7 of maximum effective radii of the object-side surface of the seventh lens and the image-side surface of the seventh lens satisfy: 2.0< DT7/(DT7-DT6) < 2.8. Preferably, an average DT6 of maximum effective radii of the object-side surface of the sixth lens and the image-side surface of the sixth lens, and an average DT7 of maximum effective radii of the object-side surface of the seventh lens and the image-side surface of the seventh lens satisfy: 2.3< DT7/(DT7-DT6) < 2.7. Through the above-mentioned conditional expression of reasonable control at reasonable within range, can rationally restrict the scope of incident light, be favorable to rejecting the relatively poor light of marginal quality, reduce off-axis aberration, effectively promote the power of resolving a video recording lens group.

In the embodiment, the average value DT1 of the maximum effective radii of the object side surface of the first lens and the image side surface of the first lens, the average value DT3 of the maximum effective radii of the object side surface of the third lens and the image side surface of the third lens, and the maximum effective radius DTs of the diaphragm satisfy: 2.0 ≦ (DT1-DT3)/DTs < 2.8. Preferably, the average DT1 of the maximum effective radii of the object-side surface of the first lens and the image-side surface of the first lens, the average DT3 of the maximum effective radii of the object-side surface of the third lens and the image-side surface of the third lens, and the maximum effective radius DTs of the diaphragm satisfy: 2.1< (DT1-DT3)/DTs < 2.7. Through the above-mentioned conditional expression of reasonable control, be favorable to reducing the front end size of making a video recording battery of lens for whole making a video recording battery of lens is lighter and thinner more.

In the present embodiment, the effective focal length f of the image pickup lens group and the radius of curvature R1 of the object side surface of the first lens satisfy: f/R1 is less than or equal to-0.5 and less than-1.0. Preferably, the effective focal length f of the image pickup lens group and the radius of curvature R1 of the object side surface of the first lens satisfy: -0.8< f/R1< -0.5. By controlling the ratio of the effective focal length f of the image pickup lens group to the curvature radius R1 of the object side surface of the first lens in a reasonable range, the reasonable distribution of the focal power of the system is facilitated.

In the present embodiment, the effective focal length f of the image pickup lens group and the radius of curvature R14 of the image side surface of the seventh lens satisfy: 1.5< f/R14< 2.5. Preferably, the effective focal length f of the image pickup lens group and the curvature radius R14 of the image side surface of the seventh lens satisfy: 1.7< f/R14 is less than or equal to 2.1. By reasonably controlling the conditional expressions in a reasonable range, the contribution of the seventh lens E7 to the fifth-order spherical aberration of the system is favorably controlled, and further the third-order spherical aberration generated by the seventh lens E7 is compensated, so that the image pickup lens group has good imaging quality on the axis.

In the present embodiment, the abbe number V5 of the fifth lens, the abbe number V6 of the sixth lens, and the abbe number V7 of the seventh lens satisfy: v5- (V6+ V7) < 20. Preferably, the abbe number V5 of the fifth lens, the abbe number V6 of the sixth lens and the abbe number V7 of the seventh lens satisfy: v5- (V6+ V7) ═ 17.34. The arrangement is favorable for reasonably controlling the dispersion degree of the system, the capability of correcting chromatic aberration is improved, and a better imaging effect is realized.

In the present embodiment, an on-axis distance TTL from the object side surface of the first lens to the imaging surface of the image pickup lens group and an effective focal length f of the image pickup lens group satisfy: 2.5< TTL/f < 3.5. Preferably, an on-axis distance TTL from the object side surface of the first lens to the imaging surface of the image pickup lens group and an effective focal length f of the image pickup lens group satisfy: 2.9< TTL/f < 3.4. This arrangement is advantageous in realizing the ultra-thin characteristic and miniaturization of the image pickup lens group.

In this embodiment, the optical distortion ODT of the image pickup lens group satisfies: i ODT | max < 5%. Preferably, the optical distortion ODT of the image pickup lens group satisfies: 0.7% < | ODT | max < 3.8%. The characteristic of small distortion is facilitated by reasonably restricting the range of optical distortion ODT of the camera lens group.

Example two

The image pickup lens group comprises a first lens with negative focal power, a second lens, a third lens with positive focal power, a fourth lens, a fifth lens with positive focal power, a sixth lens and a seventh lens with negative focal power in sequence from an object side to an image side along an optical axis. The effective focal length f of the image pickup lens group, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy the following conditions: 1.5< f/(T23+ T34) < 3.5; the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -3.0< (f6-f5)/f7 is less than or equal to-1.0.

Preferably, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: 2.8< - (f6-f5)/f7 is less than or equal to-1.0.

Through reasonable distribution of focal power, astigmatism and distortion can be effectively reduced, and the imaging quality of the camera lens group is greatly improved. By reasonably restricting the relationship among the effective focal length f of the shooting lens group, the air space T23 between the second lens and the third lens on the optical axis, and the air space T34 between the third lens and the fourth lens on the optical axis, the field curvature contribution of each field of view of the system is controlled within a reasonable range, so that the field curvature contribution generated by other lenses is balanced, and the image resolving power of the shooting lens group is effectively improved. By reasonably controlling the relationship among the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens within a reasonable range, the contribution amounts of the fifth lens E5, the sixth lens E6 and the seventh lens E7 to the aberration of the whole optical system can be effectively controlled, the off-axis aberration of the system can be balanced, and the imaging quality of the imaging lens group can be improved.

In the present embodiment, an on-axis distance TTL from the object-side surface of the first lens to the imaging surface of the image pickup lens group and a maximum field angle FOV of the image pickup lens group satisfy: 5.5mm < TTL tan (FOV/3) <6.5 mm. Preferably, an on-axis distance TTL from the object-side surface of the first lens to the imaging surface of the image pickup lens group and a maximum field angle FOV of the image pickup lens group satisfy: 5.7mm < TTL tan (FOV/3) <6.2 mm. The on-axis distance TTL from the object side surface of the first lens to the imaging surface of the shooting lens group and the conditional expression of the maximum field angle FOV of the shooting lens group are reasonably controlled within a reasonable range, so that the total length of the system can be controlled, the field angle can be increased, and the shooting space of the shooting lens group can be increased while the miniaturization is guaranteed.

The above-mentioned camera lens group may further comprise at least one stop STO to improve the imaging quality of the camera lens group. Alternatively, the stop STO may be disposed between the second lens E2 and the third lens E3. Alternatively, the above-described image pickup lens group may further include a filter E8 for correcting color deviation and/or a protective glass for protecting a photosensitive element on the image formation surface.

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 focal power and the surface shape of each lens, 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 group can be reduced, and the machinability of the camera lens group 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. The imaging lens group also has a large aperture. The advantages of ultra-thin and good imaging quality can meet the miniaturization requirement of intelligent electronic products.

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 embodiment, the image pickup lens group is not limited to include seven lenses. The imaging lens group may also include other numbers of lenses, as desired.

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 4, an imaging lens group of the first example of the present application is described. Fig. 1 shows a schematic configuration diagram of an image pickup lens group of example one.

As shown in fig. 1, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, and the object-side surface S3 of the second lens element is convex, and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element are convex. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is convex and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and the object-side surface S13 of the seventh lens element is convex, and the image-side surface S14 of the seventh lens element is concave. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image pickup lens group is 2.21mm, and the maximum field angle FOV of the image pickup lens group is 123.2 °.

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

TABLE 1

In the first example, the object-side surface and the image-side surface of any one of the first lens element E1 through the seventh lens element E7 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 2 below gives the high-order coefficient coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each of the aspherical mirrors S1-S14 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.2963E-01

-2.3964E-01

2.1861E-01

-1.5366E-01

8.2236E-02

-3.3452E-02

1.0340E-02

S2

2.1471E-01

-2.3334E-01

2.0540E-01

-1.7654E-01

2.5267E-01

-3.7788E-01

3.9940E-01

S3

9.9865E-02

-5.2488E-01

4.7347E+00

-2.8427E+01

1.2121E+02

-3.7158E+02

8.2913E+02

S4

1.7102E-01

-6.3668E-01

8.8228E+00

-7.9864E+01

5.3394E+02

-2.6608E+03

9.9701E+03

S5

6.3277E-02

-2.6713E+00

6.9138E+01

-1.1316E+03

1.2241E+04

-9.1303E+04

4.8135E+05

S6

-1.1124E-01

7.5178E-01

-9.5018E+00

8.5616E+01

-5.5713E+02

2.6283E+03

-9.0643E+03

S7

-4.4500E-01

1.9048E+00

-1.3047E+01

6.4504E+01

-2.3053E+02

6.0765E+02

-1.1971E+03

S8

-4.3170E-01

1.9904E+00

-8.9482E+00

2.8618E+01

-6.5861E+01

1.1134E+02

-1.3995E+02

S9

-1.8470E-01

1.0382E+00

-3.2558E+00

6.8954E+00

-1.0417E+01

1.1384E+01

-9.0167E+00

S10

1.0037E-01

3.0024E-02

-2.0151E-01

1.6551E-01

3.1525E-01

-1.0251E+00

1.3872E+00

S11

-2.4323E-01

3.0651E-01

-2.8164E-01

1.5296E-01

-3.9002E-02

-7.4076E-03

1.0541E-02

S12

-1.7144E-01

4.2029E-01

-5.2229E-01

4.0498E-01

-1.9178E-01

4.3750E-02

6.1424E-03

S13

6.4255E-03

-4.6448E-02

5.5064E-02

-3.5692E-02

1.5466E-02

-4.7657E-03

1.0652E-03

S14

-3.7677E-01

2.6974E-01

-1.4404E-01

5.4802E-02

-1.4942E-02

2.9659E-03

-4.3389E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.4213E-03

4.2603E-04

-5.5354E-05

5.1455E-06

-3.2327E-07

1.2278E-08

-2.1256E-10

S2

-2.8543E-01

1.3958E-01

-4.6860E-02

1.0628E-02

-1.5567E-03

1.3292E-04

-5.0260E-06

S3

-1.3549E+03

1.6180E+03

-1.3948E+03

8.4458E+02

-3.4073E+02

8.2226E+01

-8.9769E+00

S4

-2.8062E+04

5.8733E+04

-8.9666E+04

9.6656E+04

-6.9519E+04

2.9876E+04

-5.7927E+03

S5

-1.8162E+06

4.9134E+06

-9.4350E+06

1.2534E+07

-1.0939E+07

5.6365E+06

-1.2981E+06

S6

2.2919E+04

-4.2317E+04

5.6274E+04

-5.2399E+04

3.2382E+04

-1.1921E+04

1.9775E+03

S7

1.7717E+03

-1.9637E+03

1.6072E+03

-9.4312E+02

3.7521E+02

-9.0526E+01

9.9791E+00

S8

1.3132E+02

-9.1549E+01

4.6700E+01

-1.6915E+01

4.1154E+00

-6.0258E-01

4.0089E-02

S9

5.1765E+00

-2.1451E+00

6.3346E-01

-1.2973E-01

1.7481E-02

-1.3919E-03

4.9564E-05

S10

-1.1506E+00

6.3598E-01

-2.3905E-01

6.0360E-02

-9.7903E-03

9.2079E-04

-3.8148E-05

S11

-4.5389E-03

1.1829E-03

-2.0605E-04

2.4151E-05

-1.8271E-06

8.0437E-08

-1.5623E-09

S12

-8.5846E-03

3.3049E-03

-7.4734E-04

1.0874E-04

-1.0066E-05

5.4248E-07

-1.3008E-08

S13

-1.7358E-04

2.0555E-05

-1.7461E-06

1.0353E-07

-4.0645E-09

9.4874E-11

-9.9628E-13

S14

4.7013E-05

-3.7581E-06

2.1835E-07

-8.9469E-09

2.4448E-10

-3.9888E-12

2.9315E-14

TABLE 2

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 astigmatism curves of the imaging lens group of the first example, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows distortion curves of the image pickup lens group of the first example, which show values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 2 to 4, the imaging lens group given in example one can achieve good imaging quality.

Example two

As shown in fig. 5 to 8, 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. 5 shows a schematic configuration diagram of an image pickup lens group of example two.

As shown in fig. 5, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, and the object-side surface S3 of the second lens element is concave, and the image-side surface S4 of the second lens element is convex. The third lens element E3 has positive refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element are convex. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is convex and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens E7 has negative power, and the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image pickup lens group is 2.08mm, and the maximum field angle FOV of the image pickup lens group is 126.0 °.

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

TABLE 3

Table 4 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.8059E-01

-1.4212E-01

1.1294E-01

-7.7437E-02

4.2791E-02

-1.8416E-02

6.0687E-03

S2

2.0346E-01

-1.1195E-01

-8.4930E-02

6.7996E-01

-1.8089E+00

3.0704E+00

-3.6127E+00

S3

7.8070E-02

-4.5178E-02

4.8825E-01

-2.8429E+00

1.2391E+01

-3.9451E+01

9.0166E+01

S4

1.2926E-01

-3.5715E-01

5.6000E+00

-4.9267E+01

2.9658E+02

-1.2645E+03

3.8858E+03

S5

9.9022E-02

-1.9058E+00

4.4726E+01

-6.7226E+02

6.6626E+03

-4.5515E+04

2.1981E+05

S6

-6.1028E-02

-4.0689E-01

1.0093E+01

-1.2565E+02

9.9379E+02

-5.3934E+03

2.0787E+04

S7

-3.8163E-01

7.7771E-01

-3.9558E+00

1.6148E+01

-4.3756E+01

5.6418E+01

6.8829E+01

S8

-3.3549E-01

7.6916E-01

-2.8897E+00

1.0266E+01

-2.9022E+01

6.1533E+01

-9.6277E+01

S9

-1.2704E-02

-4.0776E-02

4.3259E-01

-1.2037E+00

1.7458E+00

-1.4954E+00

7.6590E-01

S10

1.7666E-01

-6.2294E-01

1.7889E+00

-3.5332E+00

5.1036E+00

-5.5535E+00

4.5875E+00

S11

-1.1295E-02

-1.0381E+00

2.4356E+00

-2.9554E+00

2.2425E+00

-1.1383E+00

3.9375E-01

S12

8.2374E-02

-7.0953E-01

1.6160E+00

-1.9328E+00

1.4782E+00

-7.8726E-01

3.0384E-01

S13

-2.6287E-02

1.6230E-02

-3.8909E-03

-1.6034E-05

3.9987E-04

-1.9479E-04

5.8778E-05

S14

-3.6014E-01

2.3940E-01

-1.2215E-01

4.5631E-02

-1.2467E-02

2.5181E-03

-3.7924E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.5134E-03

2.8184E-04

-3.8418E-05

3.7096E-06

-2.3967E-07

9.2737E-09

-1.6219E-10

S2

3.0164E+00

-1.7933E+00

7.5077E-01

-2.1539E-01

4.0172E-02

-4.3769E-03

2.1102E-04

S3

-1.4778E+02

1.7336E+02

-1.4411E+02

8.2810E+01

-3.1261E+01

6.9716E+00

-6.9565E-01

S4

-8.6720E+03

1.4035E+04

-1.6277E+04

1.3165E+04

-7.0436E+03

2.2387E+03

-3.1982E+02

S5

-7.5988E+05

1.8825E+06

-3.3065E+06

4.0096E+06

-3.1851E+06

1.4886E+06

-3.0981E+05

S6

-5.7848E+04

1.1665E+05

-1.6882E+05

1.7090E+05

-1.1485E+05

4.6020E+04

-8.3182E+03

S7

-4.7992E+02

1.0782E+03

-1.4241E+03

1.1964E+03

-6.2973E+02

1.8972E+02

-2.4978E+01

S8

1.1087E+02

-9.3550E+01

5.7087E+01

-2.4500E+01

7.0090E+00

-1.1992E+00

9.2776E-02

S9

-1.9933E-01

-8.1286E-03

2.5709E-02

-9.3020E-03

1.7039E-03

-1.6488E-04

6.7053E-06

S10

-2.8657E+00

1.3356E+00

-4.5318E-01

1.0777E-01

-1.6901E-02

1.5618E-03

-6.4190E-05

S11

-9.2421E-02

1.4313E-02

-1.3482E-03

5.6542E-05

1.8370E-06

-3.0447E-07

9.7017E-09

S12

-8.6375E-02

1.8106E-02

-2.7646E-03

2.9886E-04

-2.1664E-05

9.4440E-07

-1.8713E-08

S13

-1.2389E-05

1.8530E-06

-1.9511E-07

1.4107E-08

-6.6561E-10

1.8433E-11

-2.2704E-13

S14

4.2675E-05

-3.5672E-06

2.1801E-07

-9.4506E-09

2.7492E-10

-4.8089E-12

3.8209E-14

TABLE 4

Fig. 6 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. 7 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens group of example two. Fig. 8 shows distortion curves of the imaging lens group of example two, which show values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 6 to 8, the imaging lens group according to example two can achieve good imaging quality.

Example III

As shown in fig. 9 to 12, an image pickup lens group of example three 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. 9 shows a schematic configuration diagram of an image pickup lens group of example three.

As shown in fig. 9, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, and the object-side surface S3 and the image-side surface S4 of the second lens element are convex. The third lens element E3 has positive refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element are convex. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens E7 has negative power, and the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image pickup lens group is 1.97mm, and the maximum field angle FOV of the image pickup lens group is 128.7 °.

Table 5 shows a basic structural parameter table of the image pickup lens group of example three, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 5

Table 6 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

2.1396E-01

-2.1770E-01

1.9870E-01

-1.4648E-01

8.4585E-02

-3.7543E-02

1.2661E-02

S2

2.4118E-01

-2.3040E-01

7.0836E-02

4.1841E-01

-1.1977E+00

1.9318E+00

-2.1245E+00

S3

7.8056E-02

-4.8762E-01

4.3139E+00

-2.5339E+01

1.0436E+02

-3.0347E+02

6.3287E+02

S4

1.6240E-01

-1.5490E+00

2.1051E+01

-1.8493E+02

1.1151E+03

-4.7374E+03

1.4458E+04

S5

9.2346E-02

-1.4859E+00

2.9443E+01

-3.7288E+02

3.0498E+03

-1.6790E+04

6.3375E+04

S6

-8.2384E-02

-2.8908E-01

9.8483E+00

-1.2712E+02

1.0046E+03

-5.4286E+03

2.0877E+04

S7

-4.6976E-01

1.4979E+00

-9.9657E+00

5.8151E+01

-2.4875E+02

7.5795E+02

-1.6492E+03

S8

-3.8154E-01

1.0365E+00

-4.1326E+00

1.4612E+01

-3.8482E+01

7.2973E+01

-1.0001E+02

S9

3.8842E-02

-5.5010E-02

-8.7078E-02

9.3211E-01

-2.6719E+00

4.1097E+00

-3.9500E+00

S10

2.4162E-01

-6.7557E-01

1.1583E+00

-4.0711E-01

-2.2559E+00

5.2491E+00

-6.1384E+00

S11

5.4914E-02

-9.8117E-01

2.1734E+00

-2.6305E+00

2.0354E+00

-1.0743E+00

3.9942E-01

S12

4.4416E-02

-4.2670E-01

9.1444E-01

-9.6416E-01

5.8590E-01

-1.9774E-01

1.8401E-02

S13

-1.6592E-02

8.6312E-03

-1.7068E-03

4.8128E-06

1.1288E-04

-4.6555E-05

1.2004E-05

S14

-3.3708E-01

2.4056E-01

-1.4139E-01

6.3065E-02

-2.0777E-02

5.0192E-03

-8.8836E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-3.2155E-03

6.0800E-04

-8.4014E-05

8.2179E-06

-5.3778E-07

2.1078E-08

-3.7349E-10

S2

1.6647E+00

-9.3998E-01

3.7862E-01

-1.0559E-01

1.9275E-02

-2.0639E-03

9.8013E-05

S3

-9.5659E+02

1.0489E+03

-8.2526E+02

4.5367E+02

-1.6527E+02

3.5814E+01

-3.4913E+00

S4

-3.2026E+04

5.1522E+04

-5.9542E+04

4.8134E+04

-2.5824E+04

8.2564E+03

-1.1901E+03

S5

-1.6460E+05

2.9074E+05

-3.3849E+05

2.4319E+05

-9.2517E+04

1.0255E+04

2.0936E+03

S6

-5.8138E+04

1.1756E+05

-1.7081E+05

1.7359E+05

-1.1699E+05

4.6915E+04

-8.4627E+03

S7

2.5654E+03

-2.8333E+03

2.1788E+03

-1.1226E+03

3.6091E+02

-6.2793E+01

4.1114E+00

S8

9.9760E+01

-7.2415E+01

3.7810E+01

-1.3815E+01

3.3483E+00

-4.8294E-01

3.1347E-02

S9

2.5378E+00

-1.1230E+00

3.4411E-01

-7.1794E-02

9.7352E-03

-7.7354E-04

2.7328E-05

S10

4.5739E+00

-2.3054E+00

7.9668E-01

-1.8625E-01

2.8179E-02

-2.4917E-03

9.7809E-05

S11

-1.0648E-01

2.0495E-02

-2.8321E-03

2.7457E-04

-1.7754E-05

6.8780E-07

-1.2073E-08

S12

1.5059E-02

-8.1619E-03

2.1178E-03

-3.3422E-04

3.2647E-05

-1.8244E-06

4.4778E-08

S13

-2.1820E-06

2.8332E-07

-2.6051E-08

1.6556E-09

-6.9160E-11

1.7089E-12

-1.8922E-14

S14

1.1511E-04

-1.0863E-05

7.3625E-07

-3.4849E-08

1.0922E-09

-2.0347E-11

1.7045E-13

TABLE 6

Fig. 10 shows on-axis chromatic aberration curves of the image pickup lens group of example three, which represent the deviation of the convergent focus of light rays of different wavelengths after passing through the image pickup lens group. Fig. 11 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens group of example three. Fig. 12 shows distortion curves of the image pickup lens group of example three, which show values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 10 to 12, the imaging lens group given in example three can achieve good imaging quality.

Example four

As shown in fig. 13 to 16, an image pickup lens group of the present example four 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. 13 shows a schematic configuration diagram of an image pickup lens group of example four.

As shown in fig. 13, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, and the object-side surface S3 of the second lens element is convex, and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is convex and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens E7 has negative power, and the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image pickup lens group is 2.15mm, and the maximum field angle FOV of the image pickup lens group is 124.2 °.

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

TABLE 7

Table 8 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

2.2859E-01

-2.3812E-01

2.0109E-01

-1.2790E-01

6.1953E-02

-2.2970E-02

6.5188E-03

S2

1.9765E-01

-1.3551E-01

-1.2472E-01

4.7996E-01

-6.5883E-01

5.6340E-01

-3.3164E-01

S3

3.6457E-02

-8.9252E-02

1.0530E+00

-6.6175E+00

2.9687E+01

-9.3733E+01

2.1095E+02

S4

1.1113E-01

-7.3666E-01

9.2413E+00

-6.9303E+01

3.5581E+02

-1.2929E+03

3.4013E+03

S5

1.0124E-01

-1.1315E+00

2.0232E+01

-2.3190E+02

1.7595E+03

-9.2075E+03

3.4043E+04

S6

-3.4658E-01

2.5800E+00

-2.1541E+01

1.3851E+02

-6.7274E+02

2.4312E+03

-6.5163E+03

S7

-5.3038E-01

2.4795E+00

-1.3320E+01

5.3819E+01

-1.5101E+02

2.5643E+02

-1.2273E+02

S8

-4.3573E-01

1.5445E+00

-6.0440E+00

1.8685E+01

-4.4038E+01

7.8620E+01

-1.0628E+02

S9

-1.0933E-02

2.7641E-01

-1.0317E+00

2.3693E+00

-3.6304E+00

3.9062E+00

-3.0305E+00

S10

5.2729E-02

1.4001E-01

-4.5789E-01

1.0303E+00

-2.0558E+00

3.2219E+00

-3.5730E+00

S11

-3.0739E-01

3.7111E-01

-2.8205E-01

4.1708E-03

2.2721E-01

-2.5766E-01

1.5603E-01

S12

-2.0204E-01

4.3281E-01

-4.6593E-01

3.3766E-01

-1.7306E-01

5.7851E-02

-9.2132E-03

S13

-1.6970E-02

-2.6642E-04

1.3134E-02

-1.2218E-02

6.3887E-03

-2.2143E-03

5.3498E-04

S14

-3.1535E-01

2.0281E-01

-1.0679E-01

4.2664E-02

-1.2573E-02

2.7268E-03

-4.3649E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.4110E-03

2.3086E-04

-2.8066E-05

2.4581E-06

-1.4665E-07

5.3364E-09

-8.9354E-11

S2

1.3940E-01

-4.2670E-02

9.5549E-03

-1.5321E-03

1.6491E-04

-1.0357E-05

2.6988E-07

S3

-3.4087E+02

3.9491E+02

-3.2415E+02

1.8346E+02

-6.7915E+01

1.4773E+01

-1.4296E+00

S4

-6.5548E+03

9.2632E+03

-9.4965E+03

6.8745E+03

-3.3302E+03

9.6786E+02

-1.2744E+02

S5

-8.9992E+04

1.7025E+05

-2.2801E+05

2.1054E+05

-1.2718E+05

4.5157E+04

-7.1338E+03

S6

1.2922E+04

-1.8832E+04

1.9869E+04

-1.4741E+04

7.2843E+03

-2.1506E+03

2.8679E+02

S7

-5.7802E+02

1.7262E+03

-2.5090E+03

2.2317E+03

-1.2301E+03

3.8699E+02

-5.3230E+01

S8

1.0851E+02

-8.2984E+01

4.6705E+01

-1.8748E+01

5.0752E+00

-8.3023E-01

6.2002E-02

S9

1.7124E+00

-7.0306E-01

2.0678E-01

-4.2301E-02

5.6987E-03

-4.5347E-04

1.6119E-05

S10

2.7389E+00

-1.4505E+00

5.2847E-01

-1.2996E-01

2.0600E-02

-1.9003E-03

7.7505E-05

S11

-6.0063E-02

1.5510E-02

-2.7271E-03

3.2269E-04

-2.4609E-05

1.0930E-06

-2.1487E-08

S12

-1.3670E-03

1.1690E-03

-3.1623E-04

4.8954E-05

-4.5874E-06

2.4334E-07

-5.6413E-09

S13

-9.2046E-05

1.1353E-05

-9.9687E-07

6.0857E-08

-2.4552E-09

5.8852E-11

-6.3455E-13

S14

5.1573E-05

-4.4694E-06

2.7968E-07

-1.2266E-08

3.5691E-10

-6.1769E-12

4.8057E-14

TABLE 8

Fig. 14 shows on-axis chromatic aberration curves of the image pickup lens group of example four, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the image pickup lens group. Fig. 15 shows astigmatism curves of the imaging lens group of example four, which represent meridional field curvature and sagittal field curvature. Fig. 16 shows distortion curves of the image pickup lens group of example four, which show values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 14 to 16, the imaging lens group given in example four can achieve good imaging quality.

Example five

As shown in fig. 17 to 20, an image pickup lens group of example five 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. 17 shows a schematic configuration diagram of an image pickup lens group of example five.

As shown in fig. 17, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, and the object-side surface S3 of the second lens element is convex, and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element are convex. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is convex and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens E7 has negative power, and the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image capture lens group is 2.06mm, and the maximum field angle FOV of the image capture lens group is 127.3 °.

Table 9 shows a basic structural parameter table of the image pickup lens group of example five, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 9

Table 10 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.1647E-01

-2.3110E-01

2.0928E-01

-1.4544E-01

7.6683E-02

-3.0563E-02

9.1893E-03

S2

1.9557E-01

-8.7694E-02

-4.5514E-01

1.6049E+00

-2.8908E+00

3.4500E+00

-2.9074E+00

S3

4.2745E-02

9.9357E-03

-5.8594E-01

8.4856E+00

-5.8855E+01

2.5808E+02

-7.6867E+02

S4

1.5653E-01

-1.6540E+00

3.2554E+01

-4.0350E+02

3.4233E+03

-2.0471E+04

8.8078E+04

S5

7.9112E-02

-2.6145E+00

6.5185E+01

-1.0306E+03

1.0771E+04

-7.7689E+04

3.9668E+05

S6

-1.1879E-01

6.2663E-02

3.6019E+00

-5.6107E+01

4.6200E+02

-2.5088E+03

9.5629E+03

S7

-4.0929E-01

8.3932E-01

-4.1830E+00

1.8225E+01

-4.9836E+01

4.1065E+01

2.4648E+02

S8

-3.1219E-01

6.0104E-01

-1.7303E+00

4.9283E+00

-1.1104E+01

1.8170E+01

-2.1159E+01

S9

-3.1893E-02

1.7739E-01

-7.8121E-01

2.6080E+00

-5.4915E+00

7.3636E+00

-6.5750E+00

S10

1.8616E-01

-2.5381E-01

-4.3246E-02

1.5242E+00

-4.1818E+00

6.4257E+00

-6.4900E+00

S11

-1.4275E-01

-9.1969E-02

4.2426E-01

-6.0497E-01

5.0566E-01

-2.8483E-01

1.1369E-01

S12

-1.3802E-01

3.5235E-01

-5.7607E-01

7.2214E-01

-6.7192E-01

4.5213E-01

-2.1992E-01

S13

-1.8186E-02

1.0691E-02

-1.9259E-03

-3.6788E-04

3.7939E-04

-1.5175E-04

4.0232E-05

S14

-3.8873E-01

2.9108E-01

-1.6900E-01

7.2520E-02

-2.2915E-02

5.3578E-03

-9.3029E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.0758E-03

3.4907E-04

-4.2935E-05

3.7433E-06

-2.1868E-07

7.6645E-09

-1.2166E-10

S2

1.7700E+00

-7.8208E-01

2.4838E-01

-5.5207E-02

8.1419E-03

-7.1484E-04

2.8243E-05

S3

1.6058E+03

-2.3808E+03

2.4937E+03

-1.8040E+03

8.5744E+02

-2.4087E+02

3.0300E+01

S4

-2.7542E+05

6.2590E+05

-1.0220E+06

1.1672E+06

-8.8451E+05

3.9938E+05

-8.1295E+04

S5

-1.4527E+06

3.8241E+06

-7.1666E+06

9.3200E+06

-7.9862E+06

4.0514E+06

-9.2091E+05

S6

-2.6220E+04

5.1985E+04

-7.3831E+04

7.3152E+04

-4.7959E+04

1.8672E+04

-3.2643E+03

S7

-1.1421E+03

2.5294E+03

-3.4963E+03

3.1559E+03

-1.8178E+03

6.0902E+02

-9.0564E+01

S8

1.7459E+01

-1.0083E+01

3.9432E+00

-9.6679E-01

1.2065E-01

-1.0261E-03

-1.0053E-03

S9

4.0433E+00

-1.7406E+00

5.2408E-01

-1.0815E-01

1.4572E-02

-1.1544E-03

4.0763E-05

S10

4.5163E+00

-2.1963E+00

7.4392E-01

-1.7187E-01

2.5813E-02

-2.2715E-03

8.8868E-05

S11

-3.2826E-02

6.8852E-03

-1.0378E-03

1.0927E-04

-7.6050E-06

3.1352E-07

-5.7838E-09

S12

7.7707E-02

-1.9937E-02

3.6743E-03

-4.7370E-04

4.0532E-05

-2.0666E-06

4.7488E-08

S13

-7.5395E-06

1.0078E-06

-9.5335E-08

6.2312E-09

-2.6763E-10

6.7961E-12

-7.7303E-14

S14

1.1986E-04

-1.1379E-05

7.8318E-07

-3.7922E-08

1.2225E-09

-2.3517E-11

2.0398E-13

Watch 10

Fig. 18 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. 19 shows astigmatism curves of the imaging lens group of example five, which represent meridional field curvature and sagittal field curvature. Fig. 20 shows distortion curves of the image pickup lens group of example five, which show distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 18 to 20, the imaging lens group given in example five can achieve good imaging quality.

Example six

As shown in fig. 21 to 24, an image pickup lens group of example six 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. 21 shows a schematic configuration diagram of an image pickup lens group of example six.

As shown in fig. 21, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, and the object-side surface S3 of the second lens element is convex, and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element are convex. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is convex and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens E7 has negative power, and the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image pickup lens group is 2.07mm, and the maximum field angle FOV of the image pickup lens group is 127.1 °.

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

TABLE 11

Table 12 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.1563E-01

-2.2070E-01

1.8545E-01

-1.1842E-01

5.7402E-02

-2.1084E-02

5.8480E-03

S2

1.9406E-01

-8.4792E-02

-4.0113E-01

1.3169E+00

-2.2400E+00

2.5680E+00

-2.1069E+00

S3

3.1416E-02

3.1153E-01

-3.8030E+00

3.0353E+01

-1.6077E+02

5.9417E+02

-1.5657E+03

S4

1.4201E-01

-9.6063E-01

1.8721E+01

-2.2771E+02

1.8999E+03

-1.1124E+04

4.6644E+04

S5

8.0074E-02

-2.9130E+00

7.6850E+01

-1.2856E+03

1.4237E+04

-1.0892E+05

5.9047E+05

S6

-9.5184E-02

-2.4609E-01

7.2959E+00

-9.1006E+01

7.0312E+02

-3.7267E+03

1.4093E+04

S7

-3.6878E-01

3.1143E-01

-1.4354E+00

1.1267E+01

-5.7061E+01

1.7425E+02

-3.2331E+02

S8

-2.1817E-01

-1.4400E-01

1.4027E+00

-3.8987E+00

6.6927E+00

-8.3416E+00

8.4741E+00

S9

6.8293E-02

-4.1088E-01

7.7989E-01

2.0086E-01

-3.3242E+00

6.5196E+00

-6.9959E+00

S10

5.5449E-01

-1.7177E+00

3.3342E+00

-3.8189E+00

1.9935E+00

1.0183E+00

-2.8326E+00

S11

3.3427E-01

-1.6175E+00

3.0494E+00

-3.3368E+00

2.3861E+00

-1.1859E+00

4.2275E-01

S12

3.5090E-02

-1.3783E-01

-1.4989E-01

9.8381E-01

-1.5557E+00

1.3545E+00

-7.6329E-01

S13

-1.8379E-02

9.5954E-03

-2.2146E-03

2.7886E-04

-2.0682E-05

2.0933E-06

-6.2386E-07

S14

-3.5345E-01

2.6685E-01

-1.6687E-01

7.8862E-02

-2.7242E-02

6.8332E-03

-1.2475E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.2166E-03

1.8755E-04

-2.0988E-05

1.6465E-06

-8.5208E-08

2.5887E-09

-3.4513E-11

S2

1.2601E+00

-5.4988E-01

1.7290E-01

-3.8063E-02

5.5550E-03

-4.8183E-04

1.8770E-05

S3

2.9745E+03

-4.0781E+03

3.9940E+03

-2.7225E+03

1.2262E+03

-3.2782E+02

3.9384E+01

S4

-1.4151E+05

3.1075E+05

-4.8853E+05

5.3549E+05

-3.8837E+05

1.6742E+05

-3.2466E+04

S5

-2.2976E+06

6.4298E+06

-1.2812E+07

1.7713E+07

-1.6125E+07

8.6824E+06

-2.0924E+06

S6

-3.8672E+04

7.7175E+04

-1.1079E+05

1.1133E+05

-7.4239E+04

2.9466E+04

-5.2614E+03

S7

3.2658E+02

-4.4836E+01

-3.4621E+02

4.9626E+02

-3.3812E+02

1.2040E+02

-1.7991E+01

S8

-7.4924E+00

5.6609E+00

-3.3936E+00

1.4877E+00

-4.3860E-01

7.6941E-02

-6.0387E-03

S9

4.8471E+00

-2.2864E+00

7.4373E-01

-1.6449E-01

2.3639E-02

-1.9909E-03

7.4576E-05

S10

2.5971E+00

-1.4233E+00

5.1087E-01

-1.2141E-01

1.8461E-02

-1.6299E-03

6.3636E-05

S11

-1.0970E-01

2.0772E-02

-2.8413E-03

2.7329E-04

-1.7519E-05

6.7120E-07

-1.1612E-08

S12

2.9631E-01

-8.1200E-02

1.5729E-02

-2.1115E-03

1.8709E-04

-9.8466E-06

2.3318E-07

S13

1.5983E-07

-2.7336E-08

3.1066E-09

-2.2897E-10

1.0389E-11

-2.6068E-13

2.7308E-15

S14

1.6608E-04

-1.6068E-05

1.1152E-06

-5.4035E-08

1.7333E-09

-3.3051E-11

2.8344E-13

TABLE 12

Fig. 22 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. 23 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens group of example six. Fig. 24 shows distortion curves of the image pickup lens group of example six, which indicate values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 22 to 24, the imaging lens group given in example six can achieve good image quality.

Example seven

As shown in fig. 25 to 28, an image pickup lens group of example seven 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. 25 shows a schematic configuration diagram of an imaging lens group of example seven.

As shown in fig. 25, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, and the object-side surface S3 of the second lens element is convex, and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element are convex. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens E7 has negative power, and the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image pickup lens group is 2.08mm, and the maximum field angle FOV of the image pickup lens group is 126.8 °.

Table 13 shows a basic structural parameter table of the imaging lens group of example seven, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Watch 13

Table 14 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

2.2478E-01

-2.4819E-01

2.4227E-01

-1.8551E-01

1.0855E-01

-4.8045E-02

1.6016E-02

S2

2.1032E-01

-8.8370E-02

-6.6457E-01

2.6122E+00

-5.3705E+00

7.2609E+00

-6.8446E+00

S3

4.0300E-02

-1.1307E-02

-2.5169E-01

5.0983E+00

-3.7405E+01

1.6626E+02

-4.9420E+02

S4

1.5651E-01

-1.8913E+00

3.8752E+01

-5.0259E+02

4.4545E+03

-2.7814E+04

1.2504E+05

S5

7.7395E-02

-2.1757E+00

4.8795E+01

-6.8994E+02

6.3945E+03

-4.0585E+04

1.8089E+05

S6

-1.0493E-01

-1.7628E-01

7.8018E+00

-9.9277E+01

7.4879E+02

-3.8018E+03

1.3612E+04

S7

-4.4253E-01

1.2792E+00

-6.7014E+00

3.1397E+01

-1.1349E+02

2.9966E+02

-5.6501E+02

S8

-4.0631E-01

1.1419E+00

-3.6144E+00

9.7297E+00

-2.0619E+01

3.2969E+01

-3.9073E+01

S9

-8.9009E-02

4.6367E-01

-1.4074E+00

3.3847E+00

-6.1453E+00

7.7485E+00

-6.6944E+00

S10

1.6391E-01

-5.2051E-02

-7.7042E-01

3.3991E+00

-7.6299E+00

1.0892E+01

-1.0627E+01

S11

-1.4206E-01

-9.9978E-03

2.8142E-01

-4.7280E-01

4.1882E-01

-2.4001E-01

9.5470E-02

S12

-1.2910E-01

2.9968E-01

-4.6176E-01

5.7883E-01

-5.5603E-01

3.8965E-01

-1.9725E-01

S13

2.0491E-02

-8.9449E-02

1.0794E-01

-6.9044E-02

2.8592E-02

-8.3224E-03

1.7667E-03

S14

-3.4413E-01

2.3862E-01

-1.2870E-01

5.1499E-02

-1.5132E-02

3.2725E-03

-5.2277E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-4.0035E-03

7.4387E-04

-1.0100E-04

9.7185E-06

-6.2671E-07

2.4261E-08

-4.2568E-10

S2

4.5974E+00

-2.2106E+00

7.5388E-01

-1.7772E-01

2.7492E-02

-2.5076E-03

1.0211E-04

S3

1.0249E+03

-1.5094E+03

1.5762E+03

-1.1426E+03

5.4710E+02

-1.5558E+02

1.9890E+01

S4

-4.0915E+05

9.7468E+05

-1.6712E+06

2.0073E+06

-1.6017E+06

7.6215E+05

-1.6357E+05

S5

-5.7366E+05

1.2977E+06

-2.0756E+06

2.2921E+06

-1.6627E+06

7.1365E+05

-1.3751E+05

S6

-3.5078E+04

6.5369E+04

-8.7283E+04

8.1369E+04

-5.0254E+04

1.8462E+04

-3.0514E+03

S7

7.4686E+02

-6.7276E+02

3.8919E+02

-1.2380E+02

8.4460E+00

6.5781E+00

-1.4558E+00

S8

3.4145E+01

-2.1908E+01

1.0210E+01

-3.3768E+00

7.5589E-01

-1.0347E-01

6.5857E-03

S9

4.0158E+00

-1.6899E+00

4.9769E-01

-1.0051E-01

1.3264E-02

-1.0301E-03

3.5694E-05

S10

7.2842E+00

-3.5298E+00

1.1999E+00

-2.7943E-01

4.2410E-02

-3.7769E-03

1.4966E-04

S11

-2.7152E-02

5.5676E-03

-8.1625E-04

8.3300E-05

-5.6077E-06

2.2335E-07

-3.9785E-09

S12

7.2293E-02

-1.9176E-02

3.6450E-03

-4.8415E-04

4.2677E-05

-2.2431E-06

5.3188E-08

S13

-2.7731E-04

3.2153E-05

-2.7155E-06

1.6217E-07

-6.4797E-09

1.5519E-10

-1.6826E-12

S14

6.1690E-05

-5.3445E-06

3.3473E-07

-1.4714E-08

4.2974E-10

-7.4770E-12

5.8570E-14

TABLE 14

Fig. 26 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. 27 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens group of example seven. Fig. 28 shows distortion curves of the image pickup lens group of example seven, which show values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 26 to 28, the imaging lens group given in example seven can achieve good imaging quality.

To sum up, examples one to seven respectively satisfy the relationships shown in table 15.

Conditional formula/example	1	2	3	4	5	6	7
								TTL*tan(FOV/3)	5.76	5.95	6.15	5.83	6.05	6.04	6.01
f/(T23+T34)	2.21	1.87	2.12	2.39	2.39	2.28	2.58
								(f6-f5)/f7	-1.38	-1.51	-1.06	-1.60	-1.11	-2.72	-1.14
f/f5	0.99	0.91	0.91	1.04	0.96	1.10	0.99
								f1/f3	-2.07	-2.20	-1.59	-0.90	-1.55	-1.66	-1.51
f/CT5	2.37	2.10	2.13	2.18	2.34	2.21	2.47
								f/CT3	2.69	2.61	2.39	2.42	2.44	2.55	2.38
f/(CT3-CT6)	4.47	3.84	3.90	4.29	4.06	4.09	3.99
								f/T12	3.39	3.34	3.25	3.49	3.21	3.10	3.53
CT3/(CT1+CT2)	1.27	1.06	1.05	1.45	1.14	1.10	1.11
								EPD/DT3	1.18	1.09	1.10	0.98	1.16	1.17	1.14
DT7/(DT7-DT6)	2.68	2.49	2.43	2.67	2.56	2.36	2.59
								(DT1-DT3)/DTs	2.68	2.17	2.23	2.29	2.54	2.63	2.36
f/R1	-0.75	-0.64	-0.58	-0.69	-0.60	-0.60	-0.64
								f/R14	2.06	1.88	1.76	1.89	1.90	1.82	1.85
V5-(V6+V7)	17.34	17.34	17.34	17.34	17.34	17.34	17.34
								TTL/f	2.99	3.18	3.36	3.07	3.21	3.20	3.18
\|ODT\|max	1.67％	0.78％	0.99％	3.79％	2.51％	2.36％	2.38％

Watch 15

Table 16 gives the effective focal lengths f, f1 to f7, and the maximum angle of view FOV of the imaging lens groups of examples one to seven.

Example parameters	1	2	3	4	5	6	7
								f1(mm)	-5.02	-4.97	-3.69	-4.18	-3.60	-3.83	-3.51
f2(mm)	18.67	86.41	9.20	10.68	9.28	10.08	8.51
								f3(mm)	2.42	2.26	2.33	4.67	2.32	2.31	2.33
f4(mm)	-6.70	-5.86	-4.11	-1.84E+14	-5.53	-5.92	-4.78
								f5(mm)	2.22	2.28	2.15	2.06	2.14	1.88	2.10
f6(mm)	4.48	4.63	3.88	4.73	3.89	6.36	3.95
								f7(mm)	-1.63	-1.56	-1.63	-1.66	-1.58	-1.64	-1.62
f(mm)	2.21	2.08	1.97	2.15	2.06	2.07	2.08
								FOV(°)	123.2	126.0	128.7	124.2	127.3	127.1	126.8

TABLE 16

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 imaging lens group comprising, in order from an object side to an image side along an optical axis:

a first lens having a negative optical power;

a second lens;

a third lens having a positive optical power;

a fourth lens;

a fifth lens having a positive optical power;

a sixth lens;

a seventh lens having a negative optical power;

an on-axis distance TTL from the object side surface of the first lens to the imaging surface of the image pickup lens group and a maximum field angle FOV of the image pickup lens group satisfy: 5.5mm < TTL tan (FOV/3) <6.5 mm;

an effective focal length f of the image pickup lens group, an air space T23 on the optical axis between the second lens and the third lens, and an air space T34 on the optical axis between the third lens and the fourth lens satisfy: 1.5< f/(T23+ T34) < 3.5.

2. The imaging lens group according to claim 1, characterized in that an effective focal length f5 of the fifth lens, an effective focal length f6 of the sixth lens, and an effective focal length f7 of the seventh lens satisfy: -3.0< (f6-f5)/f7 is less than or equal to-1.0.

3. An imaging lens group according to claim 1, wherein an effective focal length f of said imaging lens group and an effective focal length f5 of said fifth lens satisfy: f/f5 is more than or equal to 0.9 and less than 1.2.

4. The imaging lens group according to claim 1, wherein an effective focal length f1 of the first lens and an effective focal length f3 of the third lens satisfy: 2.5< f1/f3 is less than or equal to-0.9.

5. An imaging lens group according to claim 1, wherein an effective focal length f of said imaging lens group and a center thickness CT5 of said fifth lens satisfy: 2.0< f/CT5< 3.0.

6. An imaging lens group according to claim 1, wherein an effective focal length f of said imaging lens group and a center thickness CT3 of said third lens satisfy: 2.0< f/CT3< 3.0.

7. The imaging lens group of claim 1, wherein an effective focal length f of the imaging lens group, a center thickness CT3 of the third lens, and a center thickness CT6 of the sixth lens are satisfied: 3.5< f/(CT3-CT6) < 5.0.

8. The imaging lens group according to claim 1, wherein an effective focal length f of the imaging lens group and an air space T12 on the optical axis between the first lens and the second lens satisfy: 3.0< f/T12< 4.0.

9. The imaging lens group according to claim 1, wherein a center thickness CT1 of the first lens, a center thickness CT2 of the second lens, and a center thickness CT3 of the third lens satisfy: CT3/(CT1+ CT2) is not less than 1.0 and not more than 1.5.

10. An imaging lens group comprising, in order from an object side to an image side along an optical axis:

a first lens having a negative optical power;

a second lens;

a third lens having a positive optical power;

a fourth lens;

a fifth lens having a positive optical power;

a sixth lens;

a seventh lens having a negative optical power;

an effective focal length f of the image pickup lens group, an air space T23 on the optical axis between the second lens and the third lens, and an air space T34 on the optical axis between the third lens and the fourth lens satisfy: 1.5< f/(T23+ T34) < 3.5;

the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -3.0< (f6-f5)/f7 is less than or equal to-1.0.