CN216411716U

CN216411716U - Image pickup lens group

Info

Publication number: CN216411716U
Application number: CN202123141230.4U
Authority: CN
Inventors: 刘子维; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-04-29
Anticipated expiration: 2031-12-14

Abstract

The utility model provides a camera lens group. The image side of the shooting lens group from the object side of the shooting lens group comprises the following components in sequence: a diaphragm, a first lens, the first lens having a positive focal power; the focal length of the second lens is variable, and the object side surface of the second lens is a convex surface; a third lens having optical power; a fourth lens having a negative focal power; a fifth lens having a positive refractive power; a sixth lens having optical power. The utility model solves the problem that the miniaturization and high image quality of the photographing lens group in the prior art are difficult to be considered at the same time.

Description

Image pickup lens group

Technical Field

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

Background

With the continuous development of the smart phone shooting technology, the camera module is developed from single shooting and double shooting to three shooting and even four shooting. The form in which at least one of the multiple cameras is an ultra-wide-angle lens has become a mainstream trend. Meanwhile, as the mobile phone is developed to be light and thin, the camera lens group needs to be designed to be miniaturized, and the imaging quality of the camera lens group is easily sacrificed.

That is, the imaging lens group in the prior art has the problem that the miniaturization and the high image quality are difficult to be compatible.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a shooting lens group to solve the problem that the miniaturization and high image quality of the shooting lens group in the prior art are difficult to achieve simultaneously.

In order to achieve the above object, according to one aspect of the present invention, there is provided an image pickup lens group comprising, in order from an object side of the image pickup lens group to an image side of the image pickup lens group: a diaphragm, a first lens, the first lens having a positive focal power; the focal length of the second lens is variable, and the object side surface of the second lens is a convex surface; a third lens having optical power; a fourth lens having a negative focal power; a fifth lens having a positive refractive power; a sixth lens having optical power.

Further, the effective semi-aperture DT11 of the object side surface of the first lens and the effective semi-aperture DT31 of the object side surface of the third lens satisfy: DT31/DT11 is not less than 1.74.

Further, the maximum focal length f2max of the second lens and the minimum focal length f2min of the second lens satisfy: | f2max/f2min | > 5.

Further, the minimum focal length fmin of the image pickup lens group and the maximum focal length fmax of the image pickup lens group satisfy: fmax/fmin < 1.2.

Further, the radius of the object-side surface of the second lens is variable, and the radius R3 of the object-side surface of the second lens satisfies: r3 is more than or equal to 88 mm.

Further, the focal length f2 of the second lens satisfies: | f2 | >200 mm.

Further, the air interval T45 of the fourth lens and the fifth lens on the optical axis of the imaging lens group and the center thickness CT4 of the fourth lens on the optical axis satisfy: 0< CT4/T45 < 1.5.

Further, an on-axis distance TTL from the object side surface of the first lens element to the imaging surface of the image capturing lens group and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: 1< TTL/ImgH < 1.5.

Further, half of the Semi-FOV of the maximum field angle of the image pickup lens group satisfies: Semi-FOV > 45.

Further, an effective focal length f4 of the fourth lens and an effective focal length f of the image pickup lens group satisfy: -7 < f4/f <0.

Further, a curvature radius R8 of the image-side surface of the fourth lens and a curvature radius R7 of the object-side surface of the fourth lens satisfy: 1.86 < (R7+ R8)/(R7-R8) < 7.49.

Further, a center thickness CT1 of the first lens on the optical axis of the imaging lens group and a center thickness CT3 of the third lens on the optical axis satisfy: 1.0 < CT1/CT3 < 2.0.

Further, an on-axis distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens group and a sum Σ CT of center thicknesses of all lenses of the imaging lens group on the optical axis of the imaging lens group satisfy: 1< TTL/sigma CT < 2.

Further, a center thickness CT5 of the fifth lens on the optical axis of the imaging lens group and a center thickness CT6 of the sixth lens on the optical axis satisfy: 1.8 < CT5/CT6 < 3.

Further, abbe numbers of at least two lenses of the first to fifth lenses are less than 20, and a minimum value Vimin of the abbe numbers of all the lenses of the image pickup lens group satisfies: 10.0< Vimin < 20.0.

Further, the fifth lens satisfies, between a center thickness CT5 on the optical axis of the imaging lens group and an edge thickness ET5 of the fifth lens: ET5/CT5< 0.5.

According to another aspect of the present invention, there is provided an image capturing lens group comprising, in order from an object side of the image capturing lens group to an image side of the image capturing lens group: a diaphragm, a first lens, the first lens having a positive focal power; the focal length of the second lens is variable, and the object side surface of the second lens is a convex surface; a third lens having optical power; a fourth lens having a negative focal power; a fifth lens having a positive refractive power; a sixth lens having a focal power; wherein, the focal length f2 of the second lens and the effective focal length f of the image pickup lens group satisfy: 0< | (f/f2) > 100 | 1.5.

Further, the focal length f2 of the second lens satisfies: | f2 | >200 mm.

With the technical solution of the present invention, the image taking lens system sequentially from an object side to an image side of the image taking lens system comprises: the lens comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens has positive focal power; the focal length of the second lens is variable, and the object side surface of the second lens is a convex surface; the third lens has focal power; the fourth lens has negative focal power; the fifth lens has positive focal power; the sixth lens has optical power.

Through the distribution of positive and negative of the focal power of each lens of the shooting lens group of reasonable control, can effectual balance the low order aberration of the shooting lens group, can reduce the sensitivity of the tolerance of the shooting lens group simultaneously, guarantee the imaging quality of the shooting lens group when keeping the miniaturization of the shooting lens group. The focal power of the second lens can be continuously changed, so that the imaging performance of the camera lens group under different object distances is greatly improved, and the camera lens group can meet the shooting requirements under different object distances. The change of focal length can be realized through the control to the second lens, and the setting of second lens has very big length that has shortened whole camera lens group simultaneously for camera lens group's structure is compacter, satisfies miniaturized requirement, has guaranteed camera lens group's imaging quality simultaneously.

Drawings

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

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

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

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

fig. 9 to 14 show an on-axis chromatic aberration curve, an astigmatic curve in a second state, a distortion curve in the second state, an astigmatic curve in a third state, a distortion curve in the third state, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 8; fig. 15 is a schematic view showing a configuration of an image pickup lens group according to a third example of the present invention;

fig. 16 to 21 show an on-axis chromatic aberration curve, an astigmatic curve in a second state, a distortion curve in the second state, an astigmatic curve in a third state, a distortion curve in the third state, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 15; fig. 22 is a schematic view showing a configuration of an image pickup lens group of example four of the present invention;

fig. 23 to 28 show an on-axis chromatic aberration curve, an astigmatic curve in a second state, a distortion curve in the second state, an astigmatic curve in a third state, a distortion curve in the third state, and a chromatic aberration of magnification curve, respectively, of the imaging lens group in fig. 22; fig. 29 is a schematic view showing a configuration of an image pickup lens group of example five of the present invention;

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

fig. 36 shows a schematic configuration diagram of the second lens in fig. 1.

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; s7, the object side surface of the third lens; s8, an image side surface of the third lens; e4, fourth lens; s9, the object side surface of the fourth lens; s10, an image side surface of the fourth lens element; e5, fifth lens; s11, the object side surface of the fifth lens; s12, an image side surface of the fifth lens element; e6, sixth lens; s13, the object-side surface of the sixth lens element; s14, an image side surface of the sixth lens element; e7 filter plate; s15, the object side surface of the filter plate; s16, the image side surface of the filter plate; 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 utility model.

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 utility model provides a camera lens group, aiming at solving the problem that the miniaturization and high image quality of the camera lens group in the prior art are difficult to be considered.

With the continuous development of the smart phone shooting technology, the camera module is developed from single shooting and double shooting to three shooting and even four shooting. The trend of carrying at least one ultra-wide-angle lens is mainstream; meanwhile, on the premise that the opening of the mobile phone is small enough and the attractiveness of the mobile phone is not affected, how to improve the focusing speed and obtain a clear image is an increasing demand of people. Therefore, the present invention provides an image capturing lens assembly, which has a large field angle and can achieve the effect of fast focusing and obtaining clear images while ensuring the miniaturization of the image capturing lens assembly.

As shown in fig. 1 to 36, the imaging lens group includes, in order from an object side to an image side thereof: the lens comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens has positive focal power; the focal length of the second lens is variable, and the object side surface of the second lens is a convex surface; the third lens has focal power; the fourth lens has negative focal power; the fifth lens has positive focal power; the sixth lens has optical power.

In the present embodiment, the effective half aperture DT11 of the object-side surface of the first lens and the effective half aperture DT31 of the object-side surface of the third lens satisfy: DT31/DT11 is not less than 1.74. By controlling DT31/DT11, on one hand, the size of the front end of the shooting lens group can be reduced, so that the whole shooting lens group is thinner; on the other hand, the range of incident light is reasonably limited, light with poor edge quality is eliminated, off-axis aberration is reduced, the resolving power of the camera lens group is effectively improved, and the imaging quality of the camera lens group is guaranteed. Preferably, 1.74 ≦ DT31/DT11 ≦ 2.5.

In the present embodiment, the maximum focal length f2max of the second lens and the minimum focal length f2min of the second lens satisfy: | f2max/f2min | > 5. The f2max/f2min is limited within a reasonable range, so that the focusing of the camera lens group is favorably realized within a large focal length change range, the second lens is combined with a corresponding driving algorithm, photos with multiple focal lengths are sampled during shooting (the focusing speed is high), all positions of a picture are combined into an image according to the clearest position of the sampled focal length, and a clear image of the whole picture is obtained. The imaging lens group in the present embodiment can achieve quick focusing due to the arrangement of the second lens. Preferably 5< | f2max/f2min | < 15.

In the present embodiment, the minimum focal length fmin of the image pickup lens group and the maximum focal length fmax of the image pickup lens group satisfy: fmax/fmin < 1.2. Through the reasonable control of the ratio of the minimum focal length to the maximum focal length of the camera lens group, the focal power of the camera lens group can be reasonably distributed, so that the camera lens group has good imaging quality, the sensitivity is reduced, and the imaging quality of the camera lens group is ensured. Preferably, 0.9 < fmax/fmin < 1.2.

In this embodiment, the radius of the object-side surface of the second lens is variable, and the radius R3 of the object-side surface of the second lens satisfies: r3 is more than or equal to 88 mm. By changing the radius of the object side surface of the second lens, the shooting lens group can realize quick focusing and focusing under the condition of small object distance. Preferably, 88mm ≦ R3 ≦ 1000 mm.

In the present embodiment, the focal length f2 of the second lens satisfies: | f2 | >200 mm. The ratio of a shot object in an image plane can be improved by controlling the focal length of the second lens within a certain range, and meanwhile, a clear image of a full picture can be acquired by combining an algorithm of corresponding driving of the second lens.

In the present embodiment, the air interval T45 of the fourth lens and the fifth lens on the optical axis of the imaging lens group and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0< CT4/T45 < 1.5. By controlling the air space of the fourth lens and the fifth lens on the optical axis and the center thickness of the fourth lens, the risk of ghost images between the fourth lens and the fifth lens can be reduced, the size compression of the shooting lens group is facilitated, and the miniaturization of the shooting lens group is facilitated. Preferably 0.5 < CT4/T45 < 1.3.

In this embodiment, an on-axis distance TTL from the object side surface of the first lens element to the imaging surface of the image pickup lens group and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: 1< TTL/ImgH < 1.5. By controlling TTL/ImgH within a reasonable range, the total length of the camera lens group can be controlled, and the miniaturization of the camera lens group is met. Preferably, 1.2< TTL/ImgH < 1.4.

In the present embodiment, half of the Semi-FOV of the maximum field angle of the image pickup lens group satisfies: Semi-FOV > 45. Through the optimization of the image pickup lens group, the maximum field angle of the image pickup lens group is larger than 90 degrees, so that the image pickup lens group can realize the characteristic of wide angle.

In the present embodiment, the effective focal length f of the image pickup lens group and the effective focal length f4 of the fourth lens satisfy: -7 < f4/f <0. By limiting f4/f within a reasonable range, the on-axis spherical aberration generated by the camera lens group can be restricted within a reasonable interval, and the imaging quality of the field of view on the optical axis is ensured. Preferably, -6 < f4/f < -1.

In the present embodiment, a radius of curvature R8 of the image-side surface of the fourth lens and a radius of curvature R7 of the object-side surface of the fourth lens satisfy: 1.86 < (R7+ R8)/(R7-R8) < 7.49. By controlling the curvature radius of the fourth lens, the refraction angle of the light beam on the fourth lens can be effectively controlled, and the imaging quality of the camera lens group is ensured. While ensuring good processing characteristics of the fourth lens. Preferably 2< (R7+ R8)/(R7-R8) < 7.

In the present embodiment, the center thickness CT1 of the first lens on the optical axis of the imaging lens group and the center thickness CT3 of the third lens on the optical axis satisfy: 1.0 < CT1/CT3 < 2.0. Through controlling the ratio of the central thickness of the first lens and the third lens, the distortion of the camera lens group can be reasonably regulated, and finally the distortion of the camera lens group is in a certain range, so that the imaging quality of the camera lens group is ensured. Preferably, 1.05 < CT1/CT3 < 1.9.

In the present embodiment, an on-axis distance TTL from the object-side surface of the first lens to the imaging surface of the imaging lens group and a sum Σ CT of center thicknesses of all lenses of the imaging lens group on the optical axis of the imaging lens group satisfy: 1< TTL/sigma CT < 2. By controlling TTL/sigma CT in a reasonable range, the distortion of the camera lens group can be reasonably controlled, so that the camera lens group has good distortion performance, and the imaging quality of the camera lens group is ensured. Preferably, 1.4 < TTL/sigma CT < 1.8.

In the present embodiment, the center thickness CT5 of the fifth lens on the optical axis of the imaging lens group and the center thickness CT6 of the sixth lens on the optical axis satisfy: 1.8 < CT5/CT6 < 3. By controlling the CT5/CT6 within a reasonable range, the distortion of the photographing lens group can be reasonably regulated and controlled, the distortion of the photographing lens group is finally controlled within a certain range, and the imaging quality of the photographing lens group is ensured. Preferably, 1.85 < CT5/CT6 < 2.5.

In the present embodiment, abbe numbers of at least two lenses of the first to fifth lenses are less than 20, and a minimum value Vimin abbe numbers of all lenses of the imaging lens group satisfies: 10.0< Vimin < 20.0. By controlling the abbe number of the lens, the chromatic aberration of the camera lens group can be effectively reduced, the occurrence of imaging overlapping is prevented, and better imaging quality is obtained.

In the present embodiment, the center thickness CT5 of the fifth lens on the optical axis of the imaging lens group and the edge thickness ET5 of the fifth lens satisfy: ET5/CT5< 0.5. By controlling ET5/CT5 within a reasonable range, the height of the whole shooting lens group can be reduced, the processability of the shooting lens group is ensured, and the risk of weld marks is reduced. Preferably, 0.2< ET5/CT5< 0.4.

Example two

The imaging lens group includes, in order from an object side to an image side thereof as illustrated in fig. 1 to 36, a stop, a first lens having positive power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the focal length of the second lens is variable, and the object side surface of the second lens is a convex surface; the third lens has focal power; the fourth lens has negative focal power; the fifth lens has positive focal power; the sixth lens has focal power; wherein, the focal length f2 of the second lens and the effective focal length f of the image pickup lens group satisfy: 0< | (f/f2) > 100 | 1.5.

Through the distribution of positive and negative of the focal power of each lens of the shooting lens group of reasonable control, can effectual balance the low order aberration of the shooting lens group, can reduce the sensitivity of the tolerance of the shooting lens group simultaneously, guarantee the imaging quality of the shooting lens group when keeping the miniaturization of the shooting lens group. The focal power of the second lens can be continuously changed, so that the imaging performance of the camera lens group under different object distances is greatly improved, and the camera lens group can meet the shooting requirements under different object distances. The change of focal length can be realized through the control to the second lens, and the setting of second lens has very big length that has shortened whole camera lens group simultaneously for camera lens group's structure is compacter, satisfies miniaturized requirement, has guaranteed camera lens group's imaging quality simultaneously. The ratio of the effective focal length of the second lens to the effective focal length of the camera lens group is controlled within a certain range, so that the focal power of the camera lens group can be reasonably distributed, and the camera lens group has good imaging quality.

Preferably, the focal length f2 of the second lens and the effective focal length f of the image pickup lens group satisfy: 0.1< | (f/f2) | 100 | < 1.3.

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

The imaging lens group in the present application may employ a plurality of lenses, for example, the above-mentioned six lenses. 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 can be reduced, and the machinability of the camera lens can be improved, so that the camera lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. The imaging lens group has a large aperture and a large field angle. 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 six lenses are exemplified in the embodiment, the image pickup lens group is not limited to including six 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 five is applicable to all embodiments of the present application.

Example one

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

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

The first lens element E1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element are convex. 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 S6 of the second lens element is planar. The third lens element E3 has negative power, and the object-side surface S7 of the third lens element is convex and the image-side surface S8 of the third lens element is concave. The fourth lens element E4 has negative power, and the object-side surface S9 of the fourth lens element is convex and the image-side surface S10 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S11 of the fifth lens element is concave, and the image-side surface S12 of the fifth lens element is convex. The sixth lens element E6 has negative power, and the object-side surface S13 of the fifth lens element is convex and the image-side surface S14 of the fifth lens element is concave. Filter E7 has an object side S15 and an image side S16 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

When the object distance of the shooting lens group is 400mm, the shooting lens group is in the first state, when the object distance of the shooting lens group is 150mm, the shooting lens group is in the second state, and when the object distance of the shooting lens group is 1200mm, the shooting lens group is in the third state.

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

TABLE 1

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

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	88.0000	0.0200	1.53	65.4
S4	Spherical surface	88.0000	0.2650	1.57	30.0
							S5	Spherical surface	All-round	0.1000	1.52	64.2
S6	Spherical surface	All-round	0.1700

TABLE 2

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

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	880.0000	0.0200	1.53	65.4
S4	Spherical surface	880.0000	0.2650	1.57	30.0
							S5	Spherical surface	All-round	0.1000	1.52	64.2
S6	Spherical surface	All-round	0.1700

TABLE 3

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

TABLE 4

In the first example, the object-side surface and the image-side surface of any one of the first lens E1, the third lens E3 through the sixth lens E6 are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

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

Flour mark

A4

A6

A8

A10

A12

A14

S1

-1.6187E-02

-4.4948E-04

-3.1843E-05

8.6247E-06

-4.7005E-06

2.0199E-06

S2

-8.9416E-02

3.8358E-03

-6.3520E-04

1.2477E-04

-1.9649E-05

-1.1674E-05

S8

-1.4638E-01

3.6240E-02

1.9801E-03

-1.3213E-03

5.5342E-04

-2.0055E-04

S9

-1.4784E-01

-3.7985E-02

6.2305E-03

2.7460E-03

3.1804E-03

4.2642E-04

S10

-1.1668E-01

-5.8264E-02

-2.8099E-03

4.5059E-03

3.0455E-03

1.8426E-03

S11

-1.2749E-01

-1.3125E-02

-1.1481E-02

-1.3584E-04

-2.8417E-03

8.2511E-04

S12

9.7247E-02

-6.9374E-03

-5.7014E-03

-7.7001E-03

-4.7720E-03

-6.8579E-04

S13

2.3064E-01

-2.9854E-03

4.4535E-02

-1.6497E-02

2.7386E-03

-3.3180E-03

S14

-2.1126E+00

9.8728E-02

1.2200E-02

-6.7784E-03

5.5861E-03

-5.5635E-03

S15

-1.3120E+00

8.4158E-02

-9.2195E-03

-7.4058E-03

1.3410E-02

-5.2902E-03

Flour mark

A16

A18

A20

A22

A24

A26

S1

-1.6062E-06

-1.8786E-07

3.0753E-07

0.0000E+00

S2

-3.8038E-06

-3.9183E-06

1.2995E-06

0.0000E+00

S8

3.5730E-05

-6.9626E-05

4.1833E-05

0.0000E+00

S9

-4.1349E-04

1.4277E-05

-1.3032E-04

0.0000E+00

S10

-1.0049E-03

-1.5178E-05

-1.4856E-04

0.0000E+00

S11

-4.4422E-04

3.8059E-04

2.5139E-04

0.0000E+00

S12

4.2043E-04

-2.5900E-04

-6.1567E-05

2.4773E-04

1.5033E-04

0.0000E+00

S13

1.9495E-03

8.1115E-04

5.6558E-04

-5.3073E-04

-1.5817E-04

0.0000E+00

S14

-1.9914E-03

-1.3077E-03

2.2961E-04

9.3624E-04

4.9352E-04

-5.2185E-04

S15

2.6090E-03

-2.4018E-03

3.9524E-04

3.8239E-04

-4.6238E-04

2.9174E-04

TABLE 5

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

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

Example two

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

As shown in fig. 8, the image capturing lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S17.

The first lens element E1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element are convex. 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 S6 of the second lens element is planar. The third lens element E3 has positive refractive power, and the object-side surface S7 and the image-side surface S8 of the third lens element are convex. The fourth lens element E4 has negative power, and the object-side surface S9 of the fourth lens element is convex and the image-side surface S10 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S11 of the fifth lens element is concave, and the image-side surface S12 of the fifth lens element is convex. The sixth lens element E6 has negative power, and the object-side surface S13 of the fifth lens element is convex and the image-side surface S14 of the fifth lens element is concave. Filter E7 has an object side S15 and an image side S16 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

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

TABLE 6

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

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	88.0000	0.0200	1.53	65.4
S4	Spherical surface	88.0000	0.2650	1.57	30.0
							S5	Spherical surface	All-round	0.1000	1.52	64.2
S6	Spherical surface	All-round	0.0700

TABLE 7

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

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	880.0000	0.0200	1.53	65.4
S4	Spherical surface	880.0000	0.2650	1.57	30.0
							S5	Spherical surface	All-round	0.1000	1.52	64.2
S6	Spherical surface	All-round	0.0700

TABLE 8

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

Example two	First state	Second state	Third state
				OBJ(mm)	400.00	150.00	1200.00
f(mm)	2.66	2.64	2.67
				f2(mm)	662.02	233.03	2330.29
f4/f	-2.21	-2.23	-2.20
				(f/f2)*100	0.40	1.13	0.11

TABLE 9

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

Watch 10

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

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

Example III

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

As shown in fig. 15, the image capturing lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S17.

The first lens element E1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element are convex. 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 S6 of the second lens element is planar. The third lens element E3 has positive refractive power, and the object-side surface S7 of the third lens element is convex, and the image-side surface S8 of the third lens element is concave. The fourth lens element E4 has negative power, and the object-side surface S9 of the fourth lens element is convex and the image-side surface S10 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S11 and the image-side surface S12 of the fifth lens element are convex surfaces. The sixth lens element E6 has negative power, and the object-side surface S13 of the fifth lens element is convex and the image-side surface S14 of the fifth lens element is concave. Filter E7 has an object side S15 and an image side S16 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

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

TABLE 11

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

TABLE 12

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

Watch 13

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

Example III	First state	Second state	Third state
				OBJ(mm)	400.00	150.00	1200.00
f(mm)	2.66	2.64	2.67
				f2(mm)	662.02	233.03	2330.29
f4/f	-2.79	-2.81	-2.77
				(f/f2)*100	0.40	1.13	0.11

TABLE 14

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

Flour mark

A4

A6

A8

A10

A12

A14

S1

-1.6325E-02

-1.1583E-03

-2.6097E-05

-7.3318E-06

-1.8370E-07

-6.8864E-07

S2

-5.2637E-02

-1.2261E-03

-3.7397E-05

-5.7676E-06

-3.1355E-06

-4.0936E-07

S7

-1.6814E-02

-1.4069E-02

1.0944E-02

-1.1888E-03

1.4291E-04

-2.8967E-04

S8

2.5108E-02

-4.2258E-02

1.5703E-02

-2.2537E-03

1.3585E-03

-5.7335E-04

S9

-9.5252E-02

-7.7795E-03

1.3421E-03

-1.3593E-03

9.7098E-04

-2.4069E-04

S10

-1.0210E-01

2.3219E-02

-4.8919E-03

9.3535E-04

3.4515E-04

3.2493E-04

S11

-1.1377E-03

1.6835E-02

1.2042E-03

1.0041E-04

-4.9675E-04

3.0035E-05

S12

1.2691E-01

1.5772E-03

2.6049E-02

-1.1413E-04

2.5008E-03

-1.2657E-03

S13

-2.2024E+00

2.3486E-01

-3.1666E-02

9.4017E-03

-2.1140E-03

-3.6407E-03

S14

-1.5993E+00

2.8568E-01

-1.0764E-01

3.8823E-02

-1.1888E-02

4.8373E-03

Flour mark

A16

A18

A20

A22

A24

A26

S1

-5.0173E-07

-1.7158E-06

-2.2243E-06

0.0000E+00

S2

-1.5820E-06

3.0038E-07

1.1803E-06

0.0000E+00

S7

7.9760E-05

6.6398E-06

-3.8676E-06

0.0000E+00

S8

6.0450E-05

-2.3512E-05

8.7729E-06

0.0000E+00

S9

-3.2013E-05

-1.5730E-05

2.2387E-05

0.0000E+00

S10

-1.5459E-04

6.1656E-05

3.2364E-05

0.0000E+00

S11

1.1349E-04

-4.1153E-05

-1.6919E-05

1.3976E-05

-2.8974E-06

0.0000E+00

S12

-1.7766E-04

-1.5754E-04

2.2152E-05

-1.2018E-06

7.6284E-06

0.0000E+00

S13

-7.2871E-06

-7.2547E-04

3.6135E-04

3.0370E-04

-3.2604E-05

9.9612E-05

S14

-1.3555E-03

-2.3000E-04

4.3756E-04

-6.1214E-04

2.4586E-04

-1.3174E-05

Watch 15

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

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

Example four

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

As shown in fig. 22, the image capturing lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S17.

The first lens element E1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element are convex. 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 S6 of the second lens element is planar. The third lens element E3 has positive refractive power, and the object-side surface S7 and the image-side surface S8 of the third lens element are convex. The fourth lens element E4 has negative power, and the object-side surface S9 of the fourth lens element is convex and the image-side surface S10 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S11 and the image-side surface S12 of the fifth lens element are convex surfaces. The sixth lens element E6 has negative power, and the object-side surface S13 of the fifth lens element is convex and the image-side surface S14 of the fifth lens element is concave. Filter E7 has an object side S15 and an image side S16 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

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

TABLE 16

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

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	88.0000	0.0200	1.53	65.4
S4	Spherical surface	88.0000	0.2650	1.57	30.0
							S5	Spherical surface	All-round	0.1000	1.52	64.2
S6	Spherical surface	All-round	0.0754

TABLE 17

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

Flour mark	Surface type	Radius of curvature	Thickness of	Refractive index	Abbe number	Coefficient of cone
							S3	Spherical surface	880.0000	0.0200	1.53	65.4
S4	Spherical surface	880.0000	0.2650	1.57	30.0
							S5	Spherical surface	All-round	0.1000	1.52	64.2
S6	Spherical surface	All-round	0.0754

Watch 18

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

Example four	First state	Second state	Third state
				OBJ(mm)	400.00	150.00	1200.00
f(mm)	2.66	2.63	2.67
				f2(mm)	662.02	233.03	2330.29
f4/f	-2.01	-2.03	-2.00
				(f/f2)*100	0.40	1.13	0.11

Watch 19

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

Watch 20

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

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

Example five

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

As shown in fig. 29, the image capturing lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S17.

The first lens element E1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element are convex. 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 S6 of the second lens element is planar. The third lens element E3 has positive refractive power, and the object-side surface S7 of the third lens element is convex, and the image-side surface S8 of the third lens element is concave. The fourth lens element E4 has negative power, and the object-side surface S9 of the fourth lens element is convex and the image-side surface S10 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S11 of the fifth lens element is concave, and the image-side surface S12 of the fifth lens element is convex. The sixth lens element E6 has negative power, and the object-side surface S13 of the fifth lens element is convex and the image-side surface S14 of the fifth lens element is concave. Filter E7 has an object side S15 and an image side S16 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

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

TABLE 21

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

TABLE 22

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

TABLE 23

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

Example five	First state	Second state	Third state
				OBJ(mm)	400.00	150.00	1200.00
f(mm)	2.67	2.64	2.68
				f2(mm)	662.02	233.03	2330.29
f4/f	-3.72	-3.76	-3.71
				(f/f2)*100	0.40	1.13	0.12

Watch 24

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

Flour mark

A4

A6

A8

A10

A12

A14

S1

-1.4087E-02

-1.4989E-03

-3.0949E-05

-5.5295E-06

-3.1997E-06

1.2344E-06

S2

-4.2476E-02

-1.3973E-03

-3.4424E-05

-1.0537E-05

1.3733E-06

4.8468E-06

S8

-1.4423E-04

-2.9650E-02

1.2699E-02

-5.8253E-04

4.0370E-04

-3.5118E-04

S9

-2.1072E-02

-5.1051E-02

1.0751E-02

-3.5284E-03

-7.0189E-05

2.2721E-04

S10

-1.1182E-01

-1.0212E-02

-1.5181E-04

-3.6280E-03

-9.3616E-04

3.1540E-04

S11

-1.3172E-01

1.5318E-02

-6.3903E-03

-1.5768E-03

-5.0113E-04

4.1998E-04

S12

9.6904E-02

1.5958E-02

-5.1797E-03

-4.4735E-03

5.7785E-04

-2.6392E-04

S13

1.5660E-01

2.8351E-02

4.2035E-02

-1.1189E-02

-1.2495E-03

-2.4173E-03

S14

-2.0108E+00

1.7489E-01

-5.5490E-02

4.4103E-03

-3.2220E-03

-2.1251E-03

S15

-1.2590E+00

1.6014E-01

-5.3188E-02

1.3496E-02

-3.9902E-03

-8.9603E-04

Flour mark

A16

A18

A20

A22

A24

A26

S1

-2.9486E-06

1.8876E-06

-1.5552E-07

0.0000E+00

S2

5.2380E-06

7.9240E-07

2.4132E-07

0.0000E+00

S8

3.3443E-05

3.0720E-05

-6.8796E-06

0.0000E+00

S9

1.2902E-04

1.8017E-04

-4.5196E-05

0.0000E+00

S10

1.4216E-04

9.1887E-05

4.9763E-05

0.0000E+00

S11

-5.9833E-05

-1.7472E-05

1.0656E-04

0.0000E+00

S12

3.1174E-06

-1.0478E-04

3.7304E-05

8.2473E-05

-7.2573E-06

0.0000E+00

S13

7.6455E-04

1.8115E-04

1.1748E-04

-4.9047E-05

-1.4930E-05

0.0000E+00

S14

1.4876E-04

-6.2390E-04

3.2346E-04

-1.6278E-04

-1.8137E-05

2.4995E-05

S15

-4.6463E-05

-5.9358E-04

6.0855E-04

-4.4242E-04

2.8508E-04

-9.7167E-05

TABLE 25

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

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

To sum up, examples one to five respectively satisfy the relationships shown in table 26.

Conditions/examples	1	2	3	4	5
						fmax/fmin	1.01	1.01	1.01	1.01	1.01
TTL/∑CT	1.66	1.67	1.62	1.65	1.65
						DT31/DT11	2.05	1.74	1.82	1.83	1.74
F2max/f2min	10.00	10.00	10.00	10.00	10.00
						CT5/CT6	2.06	1.89	2.39	2.34	2.01
ET5/CT5	0.31	0.27	0.22	0.23	0.33
						(R7+R8)/(R7-R8)	6.49	3.30	4.49	3.39	6.35
CT1/CT3	1.89	1.19	1.27	1.09	1.21
						CT4/T45	1.09	0.65	0.76	0.71	0.75
TTL/ImgH	1.37	1.38	1.37	1.37	1.36

Watch 26

Table 27 gives the effective focal lengths f1, f3 to f5 and TTL, ImgH, Semi-FOV of the respective lenses of example one to example six.

Example parameters	1	2	3	4	5
						f1(mm)	3.94	5.93	5.90	5.73	5.95
f3(mm)	-13.48	6.28	10.99	7.74	10.16
						f4(mm)	-14.29	-5.89	-7.41	-5.34	-9.93
f5(mm)	1.46	1.72	1.76	1.78	1.68
						f6(mm)	-1.77	-2.17	-2.22	-2.34	-2.05
TTL(mm)	4.43	4.46	4.45	4.45	4.41
						ImgH(mm)	3.24	3.24	3.24	3.24	3.24
Semi-FOV	50.86	50.93	50.87	50.81	50.88
						Fno	2.46	2.46	2.46	2.46	2.46

Watch 27

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 of the imaging lens group to an image side of the imaging lens group:

the light diaphragm is arranged on the light guide plate,

a first lens having a positive optical power;

the focal length of the second lens is variable, and the object side surface of the second lens is a convex surface;

a third lens having an optical power;

a fourth lens having a negative optical power;

a fifth lens having a positive optical power;

a sixth lens having an optical power.

2. The imaging lens group according to claim 1, wherein an effective semi-aperture DT11 of an object side surface of the first lens and an effective semi-aperture DT31 of an object side surface of the third lens satisfy: DT31/DT11 is not less than 1.74.

3. An imaging lens group according to claim 1, wherein a maximum focal length f2max of the second lens and a minimum focal length f2min of the second lens satisfy: | f2max/f2min | > 5.

4. An imaging lens group according to claim 1, wherein a minimum focal length fmin of said imaging lens group and a maximum focal length fmax of said imaging lens group satisfy: fmax/fmin < 1.2.

5. The imaging lens group according to claim 1, wherein a radius of an object side surface of the second lens is variable, and a radius R3 of the object side surface of the second lens satisfies: r3 is more than or equal to 88 mm.

6. The imaging lens group according to claim 1, wherein a focal length f2 of said second lens satisfies: | f2 | >200 mm.

7. An imaging lens group according to claim 1, wherein an air interval T45 of said fourth lens and said fifth lens on an optical axis of said imaging lens group and a center thickness CT4 of said fourth lens on said optical axis satisfy: 0< CT4/T45 < 1.5.

8. An image capturing lens group according to claim 1, wherein an on-axis distance TTL from an object side surface of the first lens element to an imaging surface of the image capturing lens group and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: 1< TTL/ImgH < 1.5.

9. An imaging lens group according to claim 1, wherein half of the Semi-FOV of the maximum field angle of the imaging lens group satisfies: Semi-FOV > 45.

10. The imaging lens group according to claim 1, wherein an effective focal length f4 of said imaging lens group and an effective focal length f of said fourth lens satisfy: -7 < f4/f <0.

11. The imaging lens group according to claim 1, wherein a radius of curvature R8 of an image-side surface of the fourth lens and a radius of curvature R7 of an object-side surface of the fourth lens satisfy: 1.86 < (R7+ R8)/(R7-R8) < 7.49.

12. The imaging lens group of claim 1, wherein a center thickness CT1 of the first lens on an optical axis of the imaging lens group and a center thickness CT3 of the third lens on the optical axis satisfy: 1.0 < CT1/CT3 < 2.0.

13. The imaging lens group according to claim 1, wherein an on-axis distance TTL from an object side surface of the first lens to an imaging surface of the imaging lens group and a sum Σ CT of center thicknesses of all lenses of the imaging lens group on an optical axis of the imaging lens group satisfy: 1< TTL/sigma CT < 2.

14. The imaging lens group of claim 1, wherein a center thickness CT5 of the fifth lens on an optical axis of the imaging lens group and a center thickness CT6 of the sixth lens on the optical axis satisfy: 1.8 < CT5/CT6 < 3.

15. The imaging lens group according to claim 1, wherein abbe numbers of at least two of the first to fifth lenses are less than 20, and a minimum value Vimin of abbe numbers among all lenses of the imaging lens group satisfies: 10.0< Vimin < 20.0.

16. The imaging lens group of claim 1, wherein a center thickness CT5 of the fifth lens on an optical axis of the imaging lens group and an edge thickness ET5 of the fifth lens satisfy: ET5/CT5< 0.5.

17. An imaging lens group, comprising in order from an object side of the imaging lens group to an image side of the imaging lens group:

the light diaphragm is arranged on the light guide plate,

a first lens having a positive optical power;

a third lens having an optical power;

a fourth lens having a negative optical power;

a fifth lens having a positive optical power;

a sixth lens having an optical power;

wherein a focal length f2 of the second lens and an effective focal length f of the image pickup lens group satisfy: 0< | (f/f2) > 100 | 1.5.

18. The imaging lens group according to claim 17, wherein an effective semi-aperture DT11 of an object side surface of the first lens and an effective semi-aperture DT31 of an object side surface of the third lens satisfy: DT31/DT11 is not less than 1.74.

19. An imaging lens group according to claim 17, wherein a maximum focal length f2max of the second lens and a minimum focal length f2min of said second lens satisfy: | f2max/f2min | > 5.

20. An imaging lens group according to claim 17, wherein a minimum focal length fmin of said imaging lens group and a maximum focal length fmax of said imaging lens group satisfy: fmax/fmin < 1.2.

21. The imaging lens group of claim 17, wherein the radius of the object-side surface of the second lens is variable, and the radius R3 of the object-side surface of the second lens satisfies: r3 is more than or equal to 88 mm.

22. The imaging lens group according to claim 17, wherein a focal length f2 of said second lens satisfies: | f2 | >200 mm.

23. The imaging lens group of claim 17, wherein an air interval T45 of the fourth lens and the fifth lens on an optical axis of the imaging lens group and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0< CT4/T45 < 1.5.

24. The imaging lens group according to claim 17, wherein an on-axis distance TTL from an object side surface of the first lens to an imaging surface of the imaging lens group and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: 1< TTL/ImgH < 1.5.

25. The imaging lens group of claim 17, wherein half of the Semi-FOV of the maximum field angle of the imaging lens group satisfies: Semi-FOV > 45.

26. The imaging lens group according to claim 17, wherein an effective focal length f4 of said imaging lens group and an effective focal length f of said fourth lens satisfy: -7 < f4/f <0.

27. The imaging lens group of claim 17, wherein a radius of curvature R8 of an image-side surface of the fourth lens and a radius of curvature R7 of an object-side surface of the fourth lens satisfy: 1.86 < (R7+ R8)/(R7-R8) < 7.49.

28. The imaging lens group of claim 17, wherein a center thickness CT1 of the first lens on an optical axis of the imaging lens group and a center thickness CT3 of the third lens on the optical axis satisfy: 1.0 < CT1/CT3 < 2.0.

29. The imaging lens group according to claim 17, wherein an on-axis distance TTL from an object side surface of the first lens to an imaging surface of the imaging lens group and a sum Σ CT of center thicknesses of all lenses of the imaging lens group on an optical axis of the imaging lens group satisfy: 1< TTL/sigma CT < 2.

30. The imaging lens group of claim 17, wherein a center thickness CT5 of the fifth lens on an optical axis of the imaging lens group and a center thickness CT6 of the sixth lens on the optical axis satisfy: 1.8 < CT5/CT6 < 3.

31. The imaging lens group according to claim 17, wherein abbe numbers of at least two of the first to fifth lenses are less than 20, and a minimum value Vimin of abbe numbers among all lenses of the imaging lens group satisfies: 10.0< Vimin < 20.0.

32. The imaging lens group of claim 17, wherein a center thickness CT5 of the fifth lens on an optical axis of the imaging lens group and an edge thickness ET5 of the fifth lens satisfy: ET5/CT5< 0.5.