CN113093371B

CN113093371B - Image pickup lens group

Info

Publication number: CN113093371B
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: 2023-04-25
Anticipated expiration: 2041-04-16
Also published as: CN113093371A

Abstract

The invention provides an imaging lens group. The image capturing lens assembly sequentially comprises, from an object side to an image side along an optical axis: a first lens having negative optical power; a second lens; a third lens having positive optical power; a fourth lens; a fifth lens having positive optical power; a sixth lens; a seventh lens having negative optical power; the on-axis distance TTL from the object side of the first lens to the imaging surface of the imaging lens group and the maximum field angle FOV of the imaging lens group satisfy: 5.5mm < ttl tan (FOV/3) <6.5mm; the effective focal length f of the image pickup lens group, the air space T23 on the optical axis of the second lens and the third lens, and the air space T34 on the optical axis of the third lens and the fourth lens satisfy: 1.5< f/(t23+t34) <3.5. The invention solves the problem of poor imaging quality of the shooting 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 an imaging lens group.

Background

Along with the rapid development of science and technology, the updating speed of electronic products is faster and faster, so that the imaging quality requirement of people on consumer-grade camera lens groups is higher and higher. However, as portable electronic products will be miniaturized, and as the performance of CCD and COMS image sensors increases and the size decreases, higher requirements are correspondingly placed on the image pickup lens group. The imaging quality of the existing imaging lens group is difficult to meet the requirement of users.

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

Disclosure of Invention

The invention mainly aims to provide an imaging lens group so as to solve the problem that the imaging lens group in the prior art has poor imaging quality.

In order to achieve the above object, according to one aspect of the present invention, there is provided an image pickup lens group including, in order from an object side to an image side along an optical axis: a first lens having negative optical power; a second lens; a third lens having positive optical power; a fourth lens; a fifth lens having positive optical power; a sixth lens; a seventh lens having negative optical power; the on-axis distance TTL from the object side of the first lens to the imaging surface of the imaging lens group and the maximum field angle FOV of the imaging lens group satisfy: 5.5mm < ttl tan (FOV/3) <6.5mm; the effective focal length f of the image pickup lens group, the air space T23 on the optical axis of the second lens and the third lens, and the air space T34 on the optical axis of the third lens and the fourth lens satisfy: 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< (f 6-f 5)/f 7 < 1.0.

Further, 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 or equal to 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/f 3< 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 image pickup lens group, the center thickness CT3 of the third lens, and the center thickness CT6 of the sixth lens satisfy: 3.5< f/(CT 3-CT 6) <5.0.

Further, 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.

Further, 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: CT 3/(CT1+CT2) is less than or equal to 1.0 and less than or equal to 1.5.

Further, the average value DT3 of the maximum effective radius between the entrance pupil diameter EPD of the image capturing lens group and the object side surface of the third lens and the image side surface of the third lens satisfies: 0.9< EPD/DT 3.ltoreq.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/(DT 7-DT 6) <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: and (DT 1-DT 3)/DTs is less than or equal to 2.0 and less than or equal to 2.8.

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

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 capturing lens assembly and an effective focal length f of the image capturing lens assembly satisfy: 2.5< TTL/f <3.5.

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

According to another aspect of the present invention, there is provided an image pickup lens group including, in order from an object side to an image side along an optical axis: a first lens having negative optical power; a second lens; a third lens having positive optical power; a fourth lens; a fifth lens having positive optical power; a sixth lens; a seventh lens having negative optical power; the effective focal length f of the image pickup lens group, the air space T23 on the optical axis of the second lens and the third lens, and the air space T34 on the optical axis of 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< (f 6-f 5)/f 7 < 1.0.

Further, the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the image capturing lens assembly and the maximum field angle FOV of the image capturing lens assembly satisfy: 5.5mm < ttl tan (FOV/3) <6.5mm; 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 or equal to 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 < to-0.9.

By applying the technical scheme of the invention, the image pickup lens group sequentially 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 from the object side to the image side along the optical axis. The on-axis distance TTL from the object side of the first lens to the imaging surface of the imaging lens group and the maximum field angle FOV of the imaging lens group satisfy: 5.5mm < ttl tan (FOV/3) <6.5mm; the effective focal length f of the image pickup lens group, the air space T23 on the optical axis of the second lens and the third lens, and the air space T34 on the optical axis of the third lens and the fourth lens satisfy: 1.5< f/(t23+t34) <3.5.

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

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

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

Fig. 2 to 4 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the image pickup lens group in fig. 1, respectively;

fig. 5 is a schematic diagram showing the structure of an image pickup lens group according to example two of the present invention;

fig. 6 to 8 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the image pickup lens group in fig. 5, respectively;

fig. 9 is a schematic diagram showing the structure of an image pickup lens group of example three of the present invention;

fig. 10 to 12 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the image pickup lens group in fig. 9, respectively;

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

fig. 14 to 16 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the image pickup lens group in fig. 13, respectively;

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

fig. 18 to 20 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the image pickup lens group in fig. 17, respectively;

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

fig. 22 to 24 show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the image pickup lens group in fig. 21, respectively;

Fig. 25 is a schematic diagram showing the structure 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 of the image pickup lens group in fig. 25, respectively.

Wherein the above figures include the following reference numerals:

STO and diaphragm; e1, a first lens; s1, an object side surface of a first lens; s2, an image side surface of the first lens; e2, a second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, a third lens; s5, the object side surface of the third lens is provided; s6, an image side surface of the third lens; e4, a fourth lens; s7, an object side surface of the fourth lens; s8, an image side surface of the fourth lens is provided; e5, a fifth lens; s9, an object side surface of the fifth lens; s10, an image side surface of the fifth lens; e6, a sixth lens; s11, an object side surface of the sixth lens; s12, an image side surface of the sixth lens; e7, seventh lens; s13, an object side surface of the seventh lens; s14, an image side surface of the seventh lens; e8, an optical filter; s15, the object side surface of the optical filter; s16, an image side surface of the optical filter; s17, an imaging surface.

Detailed Description

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

It is noted that 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 unless otherwise indicated.

In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present invention.

It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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, then 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 near the object side becomes the object side of the lens, and the surface of each lens near the image side is called the image side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). In 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 image side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.

In order to solve the problem of poor imaging quality of an imaging lens group in the prior art, the invention provides the imaging lens group.

Example 1

As shown in fig. 1 to 28, the image capturing lens group includes, in order from the object side to the image side along the optical axis, a first lens E1 having negative optical power, a second lens E2, a third lens E3 having positive optical power, a fourth lens E4, a fifth lens E5 having positive optical power, a sixth lens E6, and a seventh lens E7 having negative optical power. The on-axis distance TTL from the object side of the first lens to the imaging surface of the imaging lens group and the maximum field angle FOV of the imaging lens group satisfy: 5.5mm < ttl tan (FOV/3) <6.5mm; the effective focal length f of the image pickup lens group, the air space T23 on the optical axis of the second lens and the third lens, and the air space T34 on the optical axis of the third lens and the fourth lens satisfy: 1.5< f/(t23+t34) <3.5.

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

Preferably, the effective focal length f of the image pickup lens group, the air space T23 on the optical axis of the second lens and the third lens, and the air space T34 on the optical axis of the third lens and the fourth lens 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< (f 6-f 5)/f 7 < 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< (f 6-f 5)/f 7 < 1.0. By reasonably controlling the conditional expressions within a reasonable range, the contribution 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, and the off-axis aberration of the system can be balanced, so that 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 or equal to 1.2. Preferably, 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 or equal to 1.1. By controlling the ratio of the effective focal length f of the image pickup lens group to the effective focal length f5 of the fifth lens within a reasonable range, the contribution amount of the fifth lens E5 to the total 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 < to-0.9. Preferably, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: -2.2.ltoreq.f1/f3.ltoreq.0.9. The curvature of field of the image capturing lens assembly can be reasonably controlled within a certain range 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.

In the present embodiment, 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. 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 capturing lens assembly to the center thickness CT5 of the fifth lens element within a reasonable range, the influence of the third lens element E3 on the overall aberration is advantageously controlled.

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. The contribution of the third lens E3 to the system coma is reasonably controlled by controlling the ratio of the effective focal length f of the imaging lens group to the central thickness CT3 of the third lens within a reasonable range.

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/(CT 3-CT 6) <5.0. Preferably, the effective focal length f of the image pickup lens group, the center thickness CT3 of the third lens, and the center thickness CT6 of the sixth lens satisfy: 3.8< f/(CT 3-CT 6) <4.5. The conditional expression is controlled within a reasonable range, so that the coma aberration of the system is reasonably controlled, and the imaging 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, 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: 3.1< f/T12<3.6. By reasonably controlling the range of the ratio of the effective focal length f of the image pickup lens group to the air interval T12 of the first lens and the second lens on the optical axis, the influence of the first lens E1 on the system field curvature can be effectively controlled.

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: CT 3/(CT1+CT2) is less than or equal to 1.0 and less than or equal to 1.5. The distortion contribution of each view field of the control system is beneficial to be controlled in a reasonable range by controlling the conditional expression in the reasonable range, so that the imaging quality is improved.

In the present embodiment, the average value DT3 of the maximum effective radii between the entrance pupil diameter EPD of the image capturing lens group and the object side surface of the third lens and the image side surface of the third lens satisfies: 0.9< EPD/DT 3.ltoreq.1.2. The ratio of the entrance pupil diameter EPD of the image capturing lens assembly to 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 is constrained within a reasonable range, which is advantageous for reducing the front end size of the image capturing lens assembly to ensure miniaturization.

In the present embodiment, 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, 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/(DT 7-DT 6) <2.8. Preferably, 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, 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, and the following are satisfied: 2.3< DT7/(DT 7-DT 6) <2.7. The range of incident light rays can be reasonably limited by reasonably controlling the conditional expression within a reasonable range, so that poor-quality light rays at the edge can be removed, off-axis aberration can be reduced, and the resolution of the camera lens group can be effectively improved.

In the present 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 stop satisfy: and (DT 1-DT 3)/DTs is less than or equal to 2.0 and less than or equal to 2.8. Preferably, 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: 2.1< (DT 1-DT 3)/DTs <2.7. Through reasonable control of the conditional expression, the front end size of the image pickup lens group is reduced, and the whole image pickup lens group is lighter and thinner.

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: -1.0< f/R1< to-0.5. 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. 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 is controlled to be in a reasonable range, so that the focal power of the system can be reasonably distributed.

In the present embodiment, 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. 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. The contribution of the seventh lens E7 to the system fifth-order spherical aberration is controlled in a reasonable range by reasonably controlling the conditional expression, so that the third-order spherical aberration generated by the seventh lens E7 is compensated, and the imaging 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 chromatic dispersion degree of the system is reasonably controlled, the chromatic aberration correcting capacity is improved, and a better imaging effect is achieved.

In the present embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the image capturing lens assembly and the effective focal length f of the image capturing lens assembly 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 capturing lens assembly and an effective focal length f of the image capturing lens assembly 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 the present embodiment, the optical distortion ODT of the image pickup lens group satisfies: |odt|max <5%. Preferably, the optical distortion ODT of the image pickup lens group satisfies: 0.7% <|odt|max <3.8%. The range of optical distortion ODT of the camera lens group is reasonably restrained, so that the small distortion is realized.

Example two

The image pickup lens group sequentially 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 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 space T23 on the optical axis of the second lens and the third lens, and the air space T34 on the optical axis of 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< (f 6-f 5)/f 7 < 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< (f 6-f 5)/f 7 < 1.0.

Through reasonable distribution of optical power, astigmatism and distortion can be effectively reduced, and imaging quality of the imaging lens group is greatly improved. The relation among the effective focal length f of the image pickup lens group, the air interval T23 of the second lens and the third lens on the optical axis and the air interval T34 of the third lens and the fourth lens on the optical axis is reasonably restrained, so that the field curvature contribution of each view field of the system is controlled within a reasonable range, the field curvature generated by other lenses is balanced, and the resolution of the image pickup lens group is effectively improved. By reasonably controlling the relation 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 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, and the off-axis aberration of the system can be balanced, so that the imaging quality of the imaging lens group is improved.

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

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/f 3< to-0.9. Preferably, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: -2.2.ltoreq.f1/f3.ltoreq.0.9. The curvature of field of the image capturing lens assembly can be reasonably controlled within a certain range 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 image pickup lens group may further include at least one stop STO to enhance the imaging quality of the image pickup lens group. Alternatively, the stop STO may be disposed between the second lens E2 and the third lens E3. Optionally, the image pickup lens group may further include a filter E8 for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.

The imaging lens group in the present application may employ a plurality of lenses, for example, seven as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like of each lens, the aperture of the imaging lens group can be effectively increased, the sensitivity of the imaging lens group can be reduced, and the processability of the imaging lens group can be improved, so that the imaging lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones and the like. 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 mirrors of each lens is an aspherical mirror. The aspherical 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 a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens group can be varied to achieve the various results and advantages described in this specification without departing from the technical solutions claimed herein. For example, although seven lenses are described as an example 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, if desired.

Examples of specific surface types and parameters applicable to the image pickup lens groups of the above embodiments are further described below with reference to the drawings.

It should be noted that any 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 according to an example one of the present application is described. Fig. 1 shows a schematic configuration of an imaging lens group of example one.

As shown in fig. 1, the image capturing lens assembly sequentially includes, from an object side to an image side: 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 imaging surface S17.

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an image-side surface S12 of the sixth lens element is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 of the seventh lens element is convex, and an image-side surface S14 of the seventh lens element is concave. 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 imaging lens group is 2.21mm, and the maximum field angle FOV of the imaging 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 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 to the seventh lens element E7 are aspheric, and the surface shape of each aspheric lens element can be defined by, but not limited to, the following aspheric formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=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 aspherical i-th order. The following Table 2 shows the higher order 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.

Face number

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

Face number

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 example one, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the image pickup lens group. Fig. 3 shows an astigmatism curve of the imaging lens group of example one, which indicates meridional image surface curvature and sagittal image surface curvature. Fig. 4 shows distortion curves of the image pickup lens group of example one, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 2 to 4, the image capturing lens assembly according to the example can achieve good imaging quality.

Example two

As shown in fig. 5 to 8, an imaging lens group of example two of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 5 shows a schematic configuration of an imaging lens group of example two.

As shown in fig. 5, the image capturing lens assembly sequentially includes, from an object side to an image side: 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 imaging surface S17.

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is concave, and an image-side surface S4 of the second lens element is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an image-side surface S12 of the sixth lens element is convex. The seventh lens E7 has negative power, the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. 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 imaging lens group is 2.08mm, and the maximum field angle FOV of the imaging lens group is 126.0 °.

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

TABLE 3 Table 3

Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example two, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

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

Face number

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 Table 4

Fig. 6 shows an on-axis chromatic aberration curve of the image pickup lens group of example two, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the image pickup lens group. Fig. 7 shows an astigmatism curve of the imaging lens group of example two, which indicates meridional image surface curvature and sagittal image surface curvature. Fig. 8 shows distortion curves of the image pickup lens group of example two, which represent distortion magnitude values corresponding to different angles of view.

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

Example three

As shown in fig. 9 to 12, an imaging lens group of example three of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 9 shows a schematic configuration of an imaging lens group of example three.

As shown in fig. 9, the image capturing lens assembly includes, in order from an object side to an image side: 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 imaging surface S17.

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an image-side surface S12 of the sixth lens element is convex. The seventh lens E7 has negative power, the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. 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 imaging lens group is 1.97mm, and the maximum field angle FOV of the imaging 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 radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 5

Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example three, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

Face number

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

Face number

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 an on-axis chromatic aberration curve of the image pickup lens group of example three, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the image pickup lens group. Fig. 11 shows an astigmatism curve of the imaging lens group of example three, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 12 shows distortion curves of the imaging lens group of example three, which represent distortion magnitude values 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 imaging lens group of example four of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 13 shows a schematic configuration of an imaging lens group of example four.

As shown in fig. 13, the image capturing lens assembly includes, in order from an object side to an image side: 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 imaging surface S17.

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an image-side surface S12 of the sixth lens element is convex. The seventh lens E7 has negative power, the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. 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 imaging lens group is 2.15mm, and the maximum field angle FOV of the imaging lens group is 124.2 °.

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

TABLE 7

Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example four, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

Face number

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

Face number

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 an on-axis chromatic aberration curve of the image pickup lens group of example four, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the image pickup lens group. Fig. 15 shows an astigmatism curve of the imaging lens group of example four, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 16 shows distortion curves of the imaging lens group of example four, which represent distortion magnitude values 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 imaging lens group of example five of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 17 shows a schematic configuration of an imaging lens group of example five.

As shown in fig. 17, the image capturing lens assembly includes, in order from an object side to an image side: 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 imaging surface S17.

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an image-side surface S12 of the sixth lens element is convex. The seventh lens E7 has negative power, the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. 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 imaging lens group is 2.06mm, and the maximum field angle FOV of the imaging lens group is 127.3 °.

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

TABLE 9

Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example five, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

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

Face number

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

Table 10

Fig. 18 shows an on-axis chromatic aberration curve of the image pickup lens group of example five, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the image pickup lens group. Fig. 19 shows an astigmatism curve of the imaging lens group of example five, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 20 shows distortion curves of an imaging lens group of example five, which represent 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 imaging lens group of example six of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 21 shows a schematic configuration of an imaging lens group of example six.

As shown in fig. 21, the image capturing lens assembly includes, in order from an object side to an image side: 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 imaging surface S17.

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is concave, and an image-side surface S12 of the sixth lens element is convex. The seventh lens E7 has negative power, the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. 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 imaging lens group is 2.07mm, and the maximum field angle FOV of the imaging lens group is 127.1 °.

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

TABLE 11

Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example six, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

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

Face number

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 the image pickup lens group of example six, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the image pickup lens group. Fig. 23 shows an astigmatism curve of the imaging lens group of example six, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 24 shows a distortion curve of the imaging lens group of example six, which represents distortion magnitude values 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 imaging quality.

Example seven

As shown in fig. 25 to 28, an imaging lens group of the seventh example of the present application is described. In this example and the following examples, a description of portions similar to those of 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 includes, in order from an object side to an image side: 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 imaging surface S17.

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an image-side surface S12 of the sixth lens element is convex. The seventh lens E7 has negative power, the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. 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 imaging lens group is 2.08mm, and the maximum field angle FOV of the imaging lens group is 126.8 °.

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

TABLE 13

Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example seven, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

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

Face number

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 the image pickup lens group of example seven, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the image pickup lens group. Fig. 27 shows an astigmatism curve of the imaging lens group of example seven, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 28 shows a distortion curve of the imaging lens group of example seven, which represents distortion magnitude values 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.

In summary, examples one to seven satisfy the relationships shown in table 15, respectively.

Condition/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％

TABLE 15

Table 16 shows the effective focal lengths f of the imaging lens groups of examples one to seven, the effective focal lengths f1 to f7 of the respective lenses, and the maximum field angle FOV.

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, the electron-sensitive element of which may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the above-described image pickup lens group.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the 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 in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated 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 the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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, comprising, in order from an object side to an image side along an optical axis:

a first lens having negative optical power;

a second lens having positive optical power;

a third lens having positive optical power;

a fourth lens having negative optical power;

a fifth lens having positive optical power;

a sixth lens having positive optical power;

a seventh lens having negative optical power;

The image pickup lens group only comprises seven lenses;

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

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;

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

2. 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: f/f5 is more than or equal to 0.9 and less than or equal to 1.2.

3. The imaging lens system 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 < to-0.9.

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

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

6. The imaging lens group according to 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 satisfy: 3.5< f/(CT 3-CT 6) <5.0.

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

8. The imaging lens system 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: CT 3/(CT1+CT2) is less than or equal to 1.0 and less than or equal to 1.5.

9. The image capturing lens assembly of claim 1, wherein an average value DT3 of maximum effective radii between an entrance pupil diameter EPD of the image capturing lens assembly and an object side surface of the third lens and an image side surface of the third lens is:

0.9<EPD/DT3≤1.2。

10. The image capturing lens assembly of claim 1, wherein an average value DT6 of maximum effective radii of an object side surface of the sixth lens and an image side surface of the sixth lens, an average value DT7 of maximum effective radii of an object side surface of the seventh lens and an image side surface of the seventh lens, satisfy: 2.0< DT7/(DT 7-DT 6) <2.8.

11. The image capturing lens assembly of claim 1, wherein an average value DT1 of maximum effective radii of the object side surface of the first lens and the image side surface of the first lens, an average value DT3 of maximum effective radii of the object side surface of the third lens and the image side surface of the third lens, and a maximum effective radius DTs of the stop satisfy: and (DT 1-DT 3)/DTs is less than or equal to 2.0 and less than or equal to 2.8.

12. The imaging lens group according to claim 1, wherein an effective focal length f of the imaging lens group and a radius of curvature R1 of an object side surface of the first lens satisfy: -1.0< f/R1 < to-0.5.

13. The imaging lens group according to claim 1, wherein an effective focal length f of the imaging lens group and a radius of curvature R14 of an image side surface of the seventh lens satisfy: 1.5< f/R14<2.5.

14. The image pickup lens group according to claim 1, wherein an abbe number V5 of the fifth lens, an abbe number V6 of the sixth lens, and an abbe number V7 of the seventh lens satisfy: v5- (v6+v7) <20.

15. The image pickup lens group according to claim 1, wherein optical distortion ODT of the image pickup lens group satisfies:

|ODT|max<5％。

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

a first lens having negative optical power;

a second lens having positive optical power;

a third lens having positive optical power;

a fourth lens having negative optical power;

a fifth lens having positive optical power;

a sixth lens having positive optical power;

a seventh lens having negative optical power;

the image pickup lens group only comprises seven lenses;

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 the following conditions: -3.0< (f 6-f 5)/f 7 < 1.0;

17. The imaging lens set according to claim 16, wherein an effective focal length f of the imaging lens set 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 1.2.

18. The imaging lens system according to claim 16, wherein an effective focal length f1 of the first lens and an effective focal length f3 of the third lens satisfy: -2.5< f1/f 3< to-0.9.

19. The imaging lens set according to claim 16, wherein an effective focal length f of the imaging lens set and a center thickness CT5 of the fifth lens satisfy: 2.0< f/CT5<3.0.

20. The imaging lens set according to claim 16, wherein an effective focal length f of the imaging lens set and a center thickness CT3 of the third lens satisfy: 2.0< f/CT3<3.0.

21. The imaging lens set according to claim 16, wherein an effective focal length f of the imaging lens set, a center thickness CT3 of the third lens, and a center thickness CT6 of the sixth lens satisfy:

3.5<f/(CT3-CT6)<5.0。

22. The imaging lens set according to claim 16, wherein an effective focal length f of the imaging lens set and an air interval T12 between the first lens and the second lens on the optical axis satisfy: 3.0< f/T12<4.0.

23. The imaging lens system according to claim 16, 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: CT 3/(CT1+CT2) is less than or equal to 1.0 and less than or equal to 1.5.

24. The image capturing lens assembly of claim 16, wherein an average value between an entrance pupil diameter EPD of the image capturing lens assembly and a maximum effective radius DT3 of an object side of the third lens and an image side of the third lens satisfies:

0.9<EPD/DT3≤1.2。

25. the image capturing lens assembly of claim 16, wherein an average value DT6 of maximum effective radii of an object side surface of the sixth lens and an image side surface of the sixth lens, an average value DT7 of maximum effective radii of an object side surface of the seventh lens and an image side surface of the seventh lens, satisfy: 2.0< DT7/(DT 7-DT 6) <2.8.

26. The imaging lens system according to claim 16, wherein an average value DT1 of maximum effective radii of the object side surface of the first lens and the image side surface of the first lens, an average value DT3 of maximum effective radii of the object side surface of the third lens and the image side surface of the third lens, and a maximum effective radius DTs of a stop satisfy: and (DT 1-DT 3)/DTs is less than or equal to 2.0 and less than or equal to 2.8.

27. The imaging lens set according to claim 16, wherein an effective focal length f of the imaging lens set and a radius of curvature R1 of an object side surface of the first lens satisfy: -1.0< f/R1 < to-0.5.

28. The imaging lens set according to claim 16, wherein an effective focal length f of the imaging lens set and a radius of curvature R14 of an image side surface of the seventh lens satisfy: 1.5< f/R14<2.5.

29. The image pickup lens group according to claim 16, wherein an abbe number V5 of the fifth lens, an abbe number V6 of the sixth lens, and an abbe number V7 of the seventh lens satisfy: v5- (v6+v7) <20.

30. The imaging lens group according to claim 16, wherein optical distortion ODT of the imaging lens group satisfies: |odt|max <5%.