CN217181323U

CN217181323U - Imaging system

Info

Publication number: CN217181323U
Application number: CN202220835430.5U
Authority: CN
Inventors: 陈超; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-04-12
Filing date: 2022-04-12
Publication date: 2022-08-12
Anticipated expiration: 2032-04-12

Abstract

The utility model provides an imaging system. The imaging system comprises seven lenses from an object side to an image side in sequence, and the seven lenses are divided into a first lens group, a second lens group, a third lens group and a fourth lens group; wherein the first lens group includes: a first lens and a second lens; the second lens group includes: a third lens and a fourth lens; the third lens group includes: a fifth lens; the fourth lens group includes: a sixth lens and a seventh lens; wherein the first lens element has negative refractive power; the second lens element with positive refractive power is made of glass; the object side surface of the third lens is a concave surface; the fifth lens element with positive refractive power; the object side surface of the seventh lens is a concave surface; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area of the imaging system satisfy that: TTL/ImgH < 1.44. The utility model provides an imaging system among the prior art have the problem that the difficulty was realized to ultra-thinness.

Description

Imaging system

Technical Field

The utility model relates to an optical imaging equipment technical field particularly, relates to an imaging system.

Background

In recent years, the market demand in the field of intelligent portable electronic products is on the trend of increasing year by year, and with the continuous update of customer demands, the quality requirements of portable electronic products are becoming more strict. Portable electronic products are various in types, and take a mobile phone, a tablet, and a notebook computer as examples, and all of the products have a camera shooting function. At present, people gradually favor ultrathin mobile phones, flat panels, notebook computers and the like, so that higher design requirements are put forward on imaging systems carried on the mobile phones, the flat panels and the notebook computers. With the pursuit of ultra-thinning by various electronic product manufacturers, the need for an imaging system as thin and small as possible is driven, which increases the design difficulty at the same time. In addition, as the performance of the image sensor is improved and the size of the image sensor is reduced, the degree of freedom in designing the corresponding imaging system is reduced, and the difficulty in designing is further increased.

That is, the imaging system in the related art has a problem that it is difficult to achieve the ultra-thinning.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an imaging system to solve the problem that the imaging system in the prior art has the ultra-thinness to realize the difficulty.

In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging system including seven lenses in order from an object side to an image side, the seven lenses being divided into a first lens group, a second lens group, a third lens group, and a fourth lens group; wherein the first lens group includes: a first lens and a second lens; the second lens group includes: a third lens and a fourth lens; the third lens group includes: a fifth lens; the fourth lens group includes: a sixth lens and a seventh lens; wherein the first lens element has negative refractive power; the second lens element with positive refractive power is made of glass; the object side surface of the third lens is a concave surface; the fifth lens element with positive refractive power; the object side surface of the seventh lens is a concave surface; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area of the imaging system satisfy that: TTL/ImgH < 1.44.

Furthermore, the first lens group has positive refractive power, the second lens group has negative refractive power, the third lens group has positive refractive power, and the fourth lens group has negative refractive power; the effective focal length F1 of the first lens group and the effective focal length F2 of the second lens group satisfy that: -3.5< F2/F1< -1.5.

Further, the effective focal length f1 of the first lens and the effective focal length f of the imaging system satisfy: f1/f < -3.42.

Further, an air interval T23 between the second lens and the third lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy: 1< T23/CT3< 3.

Further, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1.7< CT2/CT1< 3.6.

Further, the radius of curvature R3 of the object-side surface of the second lens and the effective focal length f2 of the second lens satisfy: 0< R3/f2< 0.9.

Furthermore, the sixth lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the image side surface of the sixth lens and the effective focal length f6 of the sixth lens meet the following conditions: 0< (R11+ R12)/f6< 1.

Furthermore, both the object side surface and the image side surface of the seventh lens are concave; the effective focal length f7 of the seventh lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy that: -1< f7/f123< 0.

Further, the central thickness CT5 of the fifth lens on the optical axis and the edge thickness ET5 of the fifth lens satisfy: ET5/CT5 of 0< ET/CT is less than or equal to 0.97.

Further, the edge thickness ET1 of the first lens, the edge thickness ET3 of the third lens and the edge thickness ET6 of the sixth lens satisfy: ET6/(ET1+ ET3) <2 is more than or equal to 1.16.

Further, the central thickness CT2 of the second lens on the optical axis and the edge thickness ET2 of the second lens satisfy: 0< ET2/CT2< 0.9.

Further, an air interval T34 between the third lens and the fourth lens on the optical axis and an air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy: T34/T45< 1.

Further, the refractive index N1 of the first lens, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens and the refractive index N6 of the sixth lens satisfy that: 0< (N1+ N3)/(N4+ N6) < 1.1.

Further, the abbe number V2 of the second lens and the abbe number Vn of any one of the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: v2> Vn.

According to another aspect of the present invention, there is provided an imaging system, comprising seven lenses in order from an object side to an image side, the seven lenses being divided into a first lens group, a second lens group, a third lens group and a fourth lens group; wherein, the first lens group with positive refractive power comprises: a first lens and a second lens; the second lens group with negative refractive power comprises: a third lens and a fourth lens; the third lens group with positive refractive power comprises: a fifth lens; the fourth lens group with negative refractive power comprises: a sixth lens and a seventh lens; wherein the first lens element has negative refractive power; the second lens element with positive refractive power is made of glass; the object side surface of the third lens is a concave surface; the fifth lens element with positive refractive power; the object side surface of the seventh lens is a concave surface; the effective focal length F1 of the first lens group and the effective focal length F2 of the second lens group satisfy that: -3.5< F2/F1< -1.5.

Further, an on-axis distance TTL from the object side surface of the first lens to the imaging surface and a half ImgH of a diagonal length of an effective pixel area of the imaging system satisfy: TTL/ImgH < 1.44; the air interval T23 between the second lens and the third lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy that: 1< T23/CT3< 3.

By applying the technical scheme of the utility model, the imaging system comprises seven lenses from the object side to the image side in sequence, and the seven lenses are divided into a first lens group, a second lens group, a third lens group and a fourth lens group; wherein the first lens group includes: a first lens and a second lens; the second lens group includes: a third lens and a fourth lens; the third lens group includes: a fifth lens; the fourth lens group includes: a sixth lens and a seventh lens; wherein the first lens element has negative refractive power; the second lens element with positive refractive power is made of glass; the object side surface of the third lens is a concave surface; the fifth lens element with positive refractive power; the object side surface of the seventh lens is a concave surface; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area of the imaging system satisfy that: TTL/ImgH < 1.44.

Through the refractive power and the face type of each lens of reasonable restraint, be favorable to the steady transition of light to guarantee that imaging system can stable imaging, be convenient for plan the thickness of each lens simultaneously, be favorable to compressing imaging system overall dimension, with the characteristic of guaranteeing ultra-thin and miniaturization, so that use on portable electronic product, can guarantee imaging quality simultaneously. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half ImgH of the diagonal length of the effective pixel area of the imaging system is restrained, so that the total optical length of the imaging system is favorably ensured in a smaller range, the ultrathin characteristic is favorably ensured, and meanwhile, the restraint of ImgH is favorable for ensuring that a large enough imaging surface is provided, so that the higher imaging quality is ensured.

Drawings

The accompanying drawings, which form a part of the present application, 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 and not to limit the invention. In the drawings:

fig. 1 shows a schematic configuration diagram of an imaging system according to a first example of the present invention;

FIGS. 2-5 illustrate an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system of FIG. 1;

fig. 6 shows a schematic configuration diagram of an imaging system of example two of the present invention;

FIGS. 7-10 illustrate on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves, respectively, of the imaging system of FIG. 6;

fig. 11 shows a schematic configuration diagram of an imaging system of example three of the present invention;

fig. 12 to 15 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system in fig. 11;

fig. 16 is a schematic structural view of an imaging system according to example four of the present invention;

fig. 17 to 20 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system in fig. 16;

fig. 21 is a schematic structural view of an imaging system according to example five of the present invention;

fig. 22 to 25 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system in fig. 21;

fig. 26 is a schematic structural view of an imaging system according to example six of the present invention;

fig. 27 to 30 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system in fig. 26;

fig. 31 is a schematic structural view showing an imaging system of example seven of the present invention;

fig. 32 to 35 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging system in fig. 31.

Wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the object side surface of the first lens; s2, an image side surface of the first lens; e2, second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, third lens; s5, the object side surface of the third lens; s6, an image side surface of the third lens; e4, fourth lens; s7, the object side surface of the fourth lens; s8, an image side surface of the fourth lens element; e5, fifth lens; s9, the object side surface of the fifth lens; s10, an image side surface of the fifth lens element; e6, sixth lens; s11, the object-side surface of the sixth lens element; s12, an image side surface of the sixth lens element; e7, seventh lens; s13, an object-side surface of the seventh lens; s14, an image side surface of the seventh lens element; e8, optical filters; s15, the object side surface of the optical filter; s16, the image side surface of the optical filter; and S17, imaging surface.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

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 application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

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

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens close to the object side becomes the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. For the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

In order to solve the problem that imaging system among the prior art has the ultra-thinness to realize the difficulty, the utility model provides an imaging system.

Example one

As shown in fig. 1 to 35, the imaging system includes seven lenses in order from an object side to an image side, and the seven lenses are divided into a first lens group, a second lens group, a third lens group and a fourth lens group; wherein the first lens group includes: a first lens and a second lens; the second lens group includes: a third lens and a fourth lens; the third lens group includes: a fifth lens; the fourth lens group includes: a sixth lens and a seventh lens; wherein the first lens element has negative refractive power; the second lens element with positive refractive power is made of glass; the object side surface of the third lens is a concave surface; the fifth lens element with positive refractive power; the object side surface of the seventh lens is a concave surface; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area of the imaging system satisfy that: TTL/ImgH < 1.44.

Preferably, TTL/ImgH < 1.4.

In the present embodiment, the first lens group has positive refractive power, the second lens group has negative refractive power, the third lens group has positive refractive power, and the fourth lens group has negative refractive power; the effective focal length F1 of the first lens group and the effective focal length F2 of the second lens group satisfy that: -3.5< F2/F1< -1.5. By restricting the ratio of the effective focal length F2 of the second lens group to the effective focal length F1 of the first lens group within a certain range, the aberration of the marginal field of view can be reduced, which is beneficial to the improvement of the imaging quality. Preferably, -2.8< F2/F1< -2.3.

In the present embodiment, the effective focal length f1 of the first lens and the effective focal length f of the imaging system satisfy: f1/f < -3.42. The condition is satisfied, the deflection angle of the marginal field of view at the first lens can be controlled, and the sensitivity of the system can be effectively reduced. Preferably, f1/f < -6.6.

In the present embodiment, the air interval T23 between the second lens and the third lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 1< T23/CT3< 3. The assembly stability of the imaging system is favorably improved by meeting the conditional expression. Preferably, 1.6< T23/CT3< 2.3.

In the present embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 1.7< CT2/CT1< 3.6. The condition is satisfied, the reasonable distribution of the thicknesses of the first lens and the second lens is facilitated, and the integral thickness uniformity of the imaging system is ensured. Preferably 2.2< CT2/CT1< 3.1.

In the present embodiment, the radius of curvature R3 of the object-side surface of the second lens and the effective focal length f2 of the second lens satisfy: 0< R3/f2< 0.9. Satisfying the conditional expression helps to weaken the ghost image formed by the total internal reflection of the imaging system, and simultaneously can reduce the sensitivity of the second lens. Preferably 0.5< R3/f2< 0.6.

In this embodiment, the sixth lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the image side surface of the sixth lens and the effective focal length f6 of the sixth lens meet the following conditions: 0< (R11+ R12)/f6< 1. Satisfying the conditional expression, the contribution of the sixth lens to the system coma can be controlled, and the coma generated by the front end element can be effectively balanced, so as to obtain good imaging quality. Preferably, 0.5< (R11+ R12)/f6< 0.7.

In this embodiment, both the object-side surface and the image-side surface of the seventh lens element are concave; the effective focal length f7 of the seventh lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy that: -1< f7/f123< 0. The conditional expression is satisfied, so that the system axis has smaller aberration, and the high-order aberration of the system is balanced. Preferably, the following components: -0.6< f7/f123< -0.5.

In the present embodiment, the center thickness CT5 of the fifth lens on the optical axis and the edge thickness ET5 of the fifth lens satisfy: ET5/CT5 of 0< ET/CT is less than or equal to 0.97. Satisfying this conditional expression, can reducing the processing degree of difficulty of fifth lens, can reducing the chief ray simultaneously and incidenting the angle with the optical axis when the imaging surface, promote the relative illuminance of imaging surface. Preferably 0.7< ET5/CT5 ≦ 0.97.

In the present embodiment, the edge thicknesses ET1, ET3 of the first lens, ET6 of the third lens and the sixth lens satisfy: ET6/(ET1+ ET3) <2 is more than or equal to 1.16. The method meets the conditional expression, can effectively reduce the processing difficulty of the first lens, the third lens and the sixth lens, and simultaneously ensures that the system has good imaging quality. Preferably, 1.16 ≦ ET6/(ET1+ ET3) < 1.6.

In the present embodiment, the central thickness CT2 of the second lens on the optical axis and the edge thickness ET2 of the second lens satisfy: 0< ET2/CT2< 0.9. The second lens meets the conditional expression, and the second lens is favorable for ensuring good processing formability. Preferably, 0.3< ET2/CT2< 0.4.

In the present embodiment, an air interval T34 between the third lens and the fourth lens on the optical axis and an air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy: T34/T45< 1. The condition is satisfied, the light deflection degree is favorably slowed down, the sensitivity is reduced, and the imaging quality of the system in a microspur state can be ensured. Preferably, T34/T45< 0.8.

In the embodiment, the refractive index N1 of the first lens, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens and the refractive index N6 of the sixth lens satisfy: 0< (N1+ N3)/(N4+ N6) < 1.1. The refractive indexes of the first lens, the third lens, the fourth lens and the sixth lens are controlled within a reasonable range, so that the ratio of the first lens to the third lens is close to 1, and the chromatic aberration balance of the system is facilitated. Preferably, 1.0< (N1+ N3)/(N4+ N6) < 1.1.

In the present embodiment, the abbe number V2 of the second lens and the abbe number Vn of any one of the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: v2> Vn. By increasing the abbe number of the second lens, the system's ability to correct chromatic aberration can be improved.

Example two

As shown in fig. 1 to 35, the imaging system includes seven lenses in order from an object side to an image side, and the seven lenses are divided into a first lens group, a second lens group, a third lens group and a fourth lens group; wherein, the first lens group with positive refractive power comprises: a first lens and a second lens; the second lens group with negative refractive power comprises: a third lens and a fourth lens; the third lens group with positive refractive power comprises: a fifth lens; the fourth lens group with negative refractive power comprises: a sixth lens and a seventh lens; wherein the first lens element has negative refractive power; the second lens element with positive refractive power is made of glass; the object side surface of the third lens is a concave surface; the fifth lens element with positive refractive power; the object side surface of the seventh lens is a concave surface; the effective focal length F1 of the first lens group and the effective focal length F2 of the second lens group satisfy that: -3.5< F2/F1< -1.5.

Preferably, -2.8< F2/F1< -2.3.

Through the refractive power and the face type of each lens of reasonable restraint, be favorable to the steady transition of light to guarantee that imaging system can stable imaging, be convenient for plan the thickness of each lens simultaneously, be favorable to compressing imaging system overall dimension, with the characteristic of guaranteeing ultra-thin and miniaturization, so that use on portable electronic product, can guarantee imaging quality simultaneously. By restricting the ratio of the effective focal length F2 of the second lens group to the effective focal length F1 of the first lens group within a certain range, the aberration of the marginal field of view can be reduced, which is beneficial to the improvement of the imaging quality.

In this embodiment, an on-axis distance TTL from the object side surface of the first lens to the imaging surface and a half ImgH of a diagonal length of an effective pixel area of the imaging system satisfy: TTL/ImgH < 1.44. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half ImgH of the diagonal length of the effective pixel area of the imaging system is restrained, so that the total optical length of the imaging system is favorably ensured in a smaller range, the ultrathin characteristic is favorably ensured, and meanwhile, the restraint of ImgH is favorable for ensuring that a large enough imaging surface is provided, so that the higher imaging quality is ensured. Preferably, TTL/ImgH < 1.4.

The above-described imaging system may optionally further include a filter for correcting color deviation or a protective glass for protecting the photosensitive element on the imaging surface.

The imaging system in the present application may employ multiple lenses, such as the seven lenses described above. By reasonably distributing the refractive power, the surface shape, the center thickness of each lens, the on-axis distance between each lens and the like, the sensitivity of the lens can be effectively reduced, the machinability of the lens can be improved, and the imaging system is more favorable for production and processing and can be suitable for portable electronic equipment such as smart phones. The left side is the object side and the right side is the image side.

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 making up the imaging system can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although seven lenses are exemplified in the embodiment, the imaging system is not limited to including seven lenses. The imaging system may also include other numbers of lenses, as desired.

Examples of specific surface types, parameters applicable to the imaging system of the above embodiment are further described below with reference to the drawings.

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

Example one

As shown in fig. 1 to 5, an imaging system of example one of the present application is described. Fig. 1 shows a schematic diagram of the configuration of an imaging system of example one.

As shown in fig. 1, the imaging system, 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 seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 with negative refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with positive refractive power has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 with negative refractive power has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 with positive refractive power has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 with negative refractive power has a concave object-side surface S13 and a concave image-side surface S14. The filter E8 has a filter object-side surface S15 and a filter image-side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the imaging system is 5.42mm, the maximum field angle FOV of the imaging system is 43.6 °, the total length TTL of the imaging system is 6.80mm, and the image height ImgH is 5.26 mm.

Table 1 shows a basic structural parameter table of the imaging system of example one, in which the units of the radius of curvature, thickness/distance are millimeters (mm).

TABLE 1

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

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1-S14 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.5241E-01

-5.9077E-03

6.3810E-04

6.9441E-05

6.4057E-06

-3.3906E-06

-3.7512E-06

S2

-1.7035E-01

-6.1307E-03

1.0337E-03

8.2053E-05

-2.2432E-06

-5.7010E-06

6.9462E-07

S5

7.0700E-02

-3.3812E-03

1.3133E-03

1.8125E-04

-1.0862E-04

2.5756E-05

-1.8534E-05

S6

1.0208E-01

1.1153E-03

2.0322E-03

4.5491E-04

-1.3068E-04

2.7043E-05

-2.6160E-05

S7

-2.1195E-01

-2.9375E-04

-3.9478E-04

1.7158E-03

1.7528E-04

1.4630E-04

-7.7298E-05

S8

-4.2788E-01

1.2951E-02

4.4674E-03

4.5187E-03

3.7928E-04

2.6167E-05

-2.5036E-04

S9

-5.1159E-01

-1.9976E-02

-1.3737E-03

9.6636E-03

-1.0416E-03

3.9958E-04

-2.4264E-04

S10

-1.1912E-01

4.8335E-02

-4.2558E-02

1.6367E-02

-3.7129E-03

5.8473E-04

-1.3688E-03

S11

-2.4526E+00

4.0344E-01

-3.3434E-02

-2.5519E-02

5.5150E-03

2.7218E-03

-1.2554E-03

S12

-2.0280E+00

3.1294E-01

-3.5895E-02

-8.8069E-03

1.4135E-02

-1.2887E-02

1.7567E-03

S13

1.1593E+00

3.3663E-02

-3.2653E-02

1.1771E-02

-9.5919E-03

6.0094E-03

-4.6146E-03

S14

-4.2031E+00

8.1366E-01

-2.1483E-01

6.6935E-02

-4.2111E-02

1.7044E-02

-7.0511E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-4.2554E-06

-3.2505E-06

-2.0365E-06

2.8448E-07

1.7262E-06

1.3267E-06

2.4761E-07

S2

-3.2549E-06

-2.7167E-06

-3.9716E-06

-9.3478E-07

6.7838E-08

1.6331E-06

4.1983E-07

S5

8.0352E-06

-3.7314E-06

4.1119E-06

-1.1756E-06

8.7945E-07

-1.4578E-06

4.8772E-07

S6

8.1781E-06

-4.7097E-06

3.6772E-06

-1.2944E-06

9.8556E-07

-7.9442E-07

9.2458E-08

S7

6.4547E-06

-3.1482E-05

9.0108E-06

-1.0157E-05

6.1404E-06

-5.1852E-06

3.0756E-06

S8

-9.5185E-05

-5.8353E-05

1.1771E-06

-2.2223E-07

8.3680E-06

-5.9825E-07

5.0079E-07

S9

-6.8288E-05

8.6878E-05

1.2745E-04

1.1178E-05

-6.7113E-05

-6.9382E-05

-4.1684E-05

S10

-3.6450E-04

3.7362E-04

3.0509E-04

3.6011E-05

7.5793E-06

-4.5214E-05

-5.3505E-05

S11

-9.4590E-04

-5.2971E-04

-2.5192E-04

-4.4282E-04

-1.3147E-05

1.5044E-04

5.7640E-05

S12

1.3233E-04

1.8201E-04

-8.9071E-04

3.0846E-04

5.6797E-04

-3.7639E-04

-2.9395E-05

S13

1.2386E-03

-7.1631E-04

1.8772E-04

-2.5985E-05

-4.3175E-04

3.3302E-04

-1.1704E-04

S14

-1.9881E-03

-2.7289E-04

3.5697E-04

-1.7127E-03

-1.0383E-03

9.5156E-04

-8.7763E-05

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve of the imaging system of example one, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging system. Fig. 3 shows astigmatism curves of the imaging system of example one, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows distortion curves of the imaging system of example one, which represent distortion magnitude values corresponding to different angles of view. Fig. 5 shows a chromatic aberration of magnification curve of the imaging system of example one, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 2 to 5, the imaging system of example one can achieve good imaging quality.

Example two

As shown in fig. 6 to 10, an imaging system 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. 6 shows a schematic diagram of the configuration of the imaging system of example two.

As shown in fig. 6, the imaging system, 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 seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 with negative refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with positive refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative refractive power, and the object-side surface S5 of the third lens element is concave, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 with negative refractive power has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 with positive refractive power has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 with negative refractive power has a concave object-side surface S13 and a concave image-side surface S14. The filter E8 has a filter object-side surface S15 and a filter image-side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the imaging system is 5.41mm, the maximum field angle FOV of the imaging system is 43.7 °, the total length TTL of the imaging system is 6.80mm, and the image height ImgH is 5.26 mm.

Table 3 shows a basic structural parameter table of the imaging system of example two, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 3

Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-5.4104E-03

4.2401E-04

5.8713E-05

3.8378E-06

9.3066E-07

-2.2334E-06

-1.6792E-06

S2

-6.4557E-03

8.5902E-04

8.2768E-05

-3.1053E-06

-7.3392E-06

-9.7159E-07

-4.6116E-06

S5

-2.9963E-03

1.4210E-03

1.6010E-04

-9.2372E-05

1.2731E-05

-1.2305E-05

4.8851E-06

S6

2.1165E-03

2.4365E-03

4.6662E-04

-9.3964E-05

3.4653E-06

-1.4908E-05

-3.1816E-07

S7

-7.0922E-04

3.9090E-04

2.1859E-03

3.7040E-04

1.6546E-04

-7.2825E-05

-8.0536E-06

S8

1.2323E-02

4.9955E-03

4.9063E-03

5.7332E-04

7.0246E-05

-2.4254E-04

-1.1454E-04

S9

-2.1700E-02

-1.3989E-03

9.4792E-03

-1.5194E-03

-1.6976E-05

-5.1370E-04

-2.2727E-04

S10

5.0331E-02

-4.2992E-02

1.7251E-02

-4.4672E-03

9.2115E-06

-1.8124E-03

-4.4424E-04

S11

4.2761E-01

-4.4142E-02

-2.7112E-02

8.8162E-03

2.4859E-03

-3.1490E-03

-1.6429E-03

S12

2.8948E-01

-2.7898E-02

-1.0729E-02

1.6163E-02

-1.3804E-02

1.1395E-03

7.7924E-04

S13

2.8840E-02

-3.8330E-02

1.0485E-02

-1.1465E-02

5.4283E-03

-5.6004E-03

1.3265E-03

S14

8.6233E-01

-2.4134E-01

6.2368E-02

-4.4706E-02

1.4772E-02

-9.2946E-03

-3.6867E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-3.1889E-06

-2.1309E-06

-1.0617E-06

8.0625E-07

9.0123E-07

6.8246E-07

S2

-3.2089E-06

-3.5013E-06

-2.1728E-07

8.4557E-07

2.1489E-06

6.0288E-07

S5

-1.9851E-06

2.7696E-06

-8.7118E-07

1.1289E-06

-1.4326E-06

4.1499E-07

S6

8.7379E-08

3.5368E-08

4.4724E-07

-2.0670E-07

2.1960E-07

-5.8567E-07

S7

-3.1264E-05

5.4529E-06

-7.8157E-06

5.5325E-06

-3.8342E-06

3.3833E-06

S8

-6.9973E-05

-1.0419E-05

-2.9117E-06

6.2277E-06

-2.1257E-07

4.9061E-07

S9

-1.1952E-05

1.0215E-04

3.7918E-05

-1.3356E-05

-2.8180E-05

-2.0351E-05

S10

3.4209E-04

2.1518E-04

-2.2594E-05

6.8903E-06

-2.0115E-05

-3.6457E-05

S11

-7.5551E-04

-3.8390E-04

-2.4807E-04

1.5390E-04

8.2695E-05

-2.3876E-05

S12

-1.9423E-04

-8.1524E-04

6.8195E-04

5.7901E-04

-4.7546E-04

-3.7536E-05

S13

-1.0798E-03

1.6123E-04

-5.7422E-05

-5.1126E-04

5.3056E-04

-3.5660E-05

S14

3.0624E-04

-8.4117E-06

-2.3784E-03

-7.5819E-04

1.3716E-03

3.4507E-05

TABLE 4

Fig. 7 shows an on-axis chromatic aberration curve of the imaging system of example two, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging system. Fig. 8 shows astigmatism curves of the imaging system of example two, which represent meridional field curvature and sagittal field curvature. Fig. 9 shows distortion curves of the imaging system of example two, which represent distortion magnitude values corresponding to different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the imaging system of example two, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 7 to 10, the imaging system of example two can achieve good imaging quality.

Example III

As shown in fig. 11 to 15, an imaging system of example three of the present application is described. Fig. 11 shows a schematic diagram of the configuration of an imaging system of example three.

As shown in fig. 11, the imaging system, 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 seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 with negative refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with positive refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 with positive refractive power has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 with positive refractive power has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 with negative refractive power has a concave object-side surface S13 and a concave image-side surface S14. The filter E8 has a filter object-side surface S15 and a filter image-side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the imaging system is 5.43mm, the maximum field angle FOV of the imaging system is 43.6 °, the total length TTL of the imaging system is 6.80mm, and the image height ImgH is 5.26 mm.

Table 5 shows a basic structural parameter table of the imaging system of example three, in which the units of the radius of curvature, thickness/distance are millimeters (mm).

TABLE 5

Table 6 shows the high-order term coefficients that can be used for each aspherical mirror surface in example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 6

Fig. 12 shows an on-axis chromatic aberration curve of the imaging system of example three, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging system. Fig. 13 shows astigmatism curves of the imaging system of example three, which represent meridional field curvature and sagittal field curvature. Fig. 14 shows distortion curves of the imaging system of example three, which represent distortion magnitude values corresponding to different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the imaging system of example three, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 12 to 15, the imaging system given in example three can achieve good imaging quality.

Example four

As shown in fig. 16 to 20, an imaging system of example four of the present application is described. Fig. 16 shows a schematic diagram of the configuration of an imaging system of example four.

As shown in fig. 16, the imaging system, 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 seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 with negative refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with positive refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 with negative refractive power has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 with positive refractive power has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 with negative refractive power has a concave object-side surface S13 and a concave image-side surface S14. The filter E8 has a filter object-side surface S15 and a filter image-side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the imaging system is 5.45mm, the maximum field angle FOV of the imaging system is 43.5 °, the total length TTL of the imaging system is 6.56mm, and the image height ImgH is 5.26 mm.

Table 7 shows a basic structural parameter table of the imaging system of example four, in which the units of the radius of curvature, thickness/distance are millimeters (mm).

TABLE 7

Table 8 shows the high-order term coefficients that can be used for each aspherical mirror surface in example four, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 8

Fig. 17 shows an on-axis chromatic aberration curve of the imaging system of example four, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging system. Fig. 18 shows astigmatism curves of the imaging system of example four, which represent meridional field curvature and sagittal field curvature. Fig. 19 shows distortion curves of the imaging system of example four, which represent distortion magnitude values corresponding to different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the imaging system of example four, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 17 to 20, the imaging system given in example four can achieve good imaging quality.

Example five

As shown in fig. 21 to 25, an imaging system of example five of the present application is described. Fig. 21 shows a schematic diagram of the imaging system configuration of example five.

As shown in fig. 21, the imaging system, 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 seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 with negative refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with positive refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 with negative refractive power has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 with positive refractive power has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 with negative refractive power has a concave object-side surface S13 and a concave image-side surface S14. The filter E8 has a filter object-side surface S15 and a filter image-side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the imaging system is 5.45mm, the maximum field angle FOV of the imaging system is 43.8 °, the total length TTL of the imaging system is 6.80mm, and the image height ImgH is 5.26 mm.

Table 9 shows a basic structural parameter table of the imaging system of example five, in which the units of the radius of curvature, thickness/distance are millimeters (mm).

TABLE 9

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

Watch 10

Fig. 22 shows an on-axis chromatic aberration curve of the imaging system of example five, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging system. Fig. 23 shows astigmatism curves of the imaging system of example five, which represent meridional field curvature and sagittal field curvature. Fig. 24 shows distortion curves of the imaging system of example five, which represent distortion magnitude values corresponding to different angles of view. Fig. 25 shows a chromatic aberration of magnification curve of the imaging system of example five, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 22 to 25, the imaging system given in example five can achieve good imaging quality.

Example six

As shown in fig. 26 to 30, an imaging system of example six of the present application is described. Fig. 26 shows a schematic diagram of an imaging system configuration of example six.

As shown in fig. 26, the imaging system, 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 seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 with negative refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with positive refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 with negative refractive power has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 with positive refractive power has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 with positive refractive power has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 with negative refractive power has a concave object-side surface S13 and a concave image-side surface S14. The filter E8 has a filter object-side surface S15 and a filter image-side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the imaging system is 5.46mm, the maximum field angle FOV of the imaging system is 42.4 °, the total length TTL of the imaging system is 6.80mm, and the image height ImgH is 5.11 mm.

Table 11 shows a basic structural parameter table of the imaging system of example six, in which the units of the radius of curvature, thickness/distance are millimeters (mm).

TABLE 11

Table 12 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 12

Fig. 27 shows an on-axis chromatic aberration curve of the imaging system of example six, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging system. Fig. 28 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging system of example six. Fig. 29 shows distortion curves of the imaging system of example six, which represent distortion magnitude values corresponding to different angles of view. Fig. 30 shows a chromatic aberration of magnification curve of the imaging system of example six, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 27 to 30, the imaging system given in example six can achieve good imaging quality.

Example seven

As shown in fig. 31 to 35, an imaging system of example seven of the present application is described. Fig. 31 shows a schematic diagram of the structure of an imaging system of example seven.

As shown in fig. 31, the imaging system, 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 seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 with negative refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with positive refractive power has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 with negative refractive power has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 with positive refractive power has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 with negative refractive power has a concave object-side surface S13 and a concave image-side surface S14. The filter E8 has a filter object-side surface S15 and a filter image-side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

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

Watch 13

Table 14 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example seven, wherein each of the aspherical mirror surface types can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.4894E-01

-3.8193E-03

4.7752E-04

4.8970E-05

2.4175E-06

-1.0734E-06

-1.3728E-06

S2

-1.7881E-01

-4.8365E-03

8.6173E-04

6.5610E-05

-5.1042E-06

-1.1385E-05

4.7056E-07

S5

6.8371E-02

-1.5572E-03

1.6659E-03

1.3734E-04

-9.9479E-05

8.8301E-06

-1.5408E-05

S6

1.0330E-01

3.6551E-03

3.4129E-03

5.0331E-04

-7.6859E-05

-2.7847E-06

-2.0502E-05

S7

-2.1889E-01

-4.6131E-03

3.1893E-03

3.1423E-03

9.0233E-04

2.8704E-04

-4.3360E-06

S8

-4.3689E-01

5.2338E-03

7.0305E-03

5.4244E-03

1.2055E-03

3.2743E-04

-3.5342E-05

S9

-5.3677E-01

-3.7038E-02

-1.6682E-02

4.4534E-03

-1.8071E-03

1.3267E-03

5.5753E-04

S10

-1.0908E-01

5.6253E-02

-5.3361E-02

1.9658E-02

-7.9825E-03

1.3835E-04

-1.1376E-03

S11

-2.7454E+00

4.6919E-01

-4.4327E-02

-2.7364E-02

1.3135E-02

-4.2396E-03

-6.4206E-03

S12

-1.9923E+00

9.6581E-02

1.2214E-02

-1.3696E-02

2.8948E-02

-1.7771E-02

-5.7388E-03

S13

4.0180E-01

2.3636E-01

-1.3796E-01

6.2116E-02

-4.4860E-02

2.6772E-02

-1.4594E-02

S14

-5.3374E+00

1.2584E+00

-4.2799E-01

1.1809E-01

-7.1976E-02

3.3207E-02

-1.8565E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-4.5189E-07

-1.7001E-06

-1.0889E-06

-1.1013E-06

-1.3294E-07

1.2322E-07

1.1023E-06

S2

-3.8023E-06

-1.3586E-06

-2.5763E-06

-1.4842E-07

-8.7061E-07

4.2323E-07

-1.2660E-07

S5

7.9657E-06

-3.7799E-06

2.2467E-06

-1.3888E-06

1.1344E-06

-2.8186E-07

-4.9355E-08

S6

3.7140E-06

-2.6387E-06

1.1624E-06

-3.3387E-07

-3.1043E-07

6.3612E-08

-4.2281E-07

S7

1.0924E-05

-1.0363E-05

1.0402E-05

-2.9497E-06

3.2985E-06

-3.5440E-06

1.7536E-06

S8

-2.5677E-05

-1.0630E-05

3.5125E-06

4.4428E-06

2.9500E-07

-8.6540E-07

-3.8392E-06

S9

2.5868E-04

-1.6134E-04

-2.1759E-04

-2.5282E-04

-1.6074E-04

-9.7962E-05

-3.1534E-05

S10

1.6308E-04

-1.5123E-04

-6.9404E-05

-1.4708E-04

2.0349E-05

-5.2817E-05

2.1802E-05

S11

1.6478E-03

-1.2203E-04

-5.4787E-04

-2.5308E-04

3.1349E-04

-1.9131E-04

-1.2196E-04

S12

-2.5035E-05

-1.0930E-03

-2.1123E-03

-8.7022E-04

1.4822E-03

6.4946E-04

7.0930E-04

S13

8.5681E-03

-6.8967E-03

2.1366E-03

4.0173E-04

-1.5613E-03

6.0546E-04

1.2551E-04

S14

5.2637E-03

1.5746E-03

-3.2126E-04

-5.6079E-03

-7.8306E-04

1.9655E-03

-2.5457E-05

TABLE 14

Fig. 32 shows an on-axis chromatic aberration curve of the imaging system of example seven, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging system. Fig. 33 shows astigmatism curves of the imaging system of example seven, which represent meridional field curvature and sagittal field curvature. Fig. 34 shows distortion curves of the imaging system of example seven, which represent distortion magnitude values corresponding to different angles of view. Fig. 35 shows a chromatic aberration of magnification curve of the imaging system of example seven, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 32 to 35, the imaging system of example seven can achieve good imaging quality.

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

Conditional formula/example	1	2	3	4	5	6	7
								TTL/ImgH	1.29	1.29	1.29	1.25	1.29	1.33	1.29
(R11+R12)/f6	0.66	0.65	0.64	0.63	0.60	0.61	0.61
								f7/f123	-0.54	-0.55	-0.54	-0.56	-0.59	-0.59	-0.57
ET5/CT5	0.76	0.78	0.81	0.87	0.92	0.93	0.89
								f1/f	-15.45	-11.97	-11.05	-8.53	-7.25	-6.69	-8.02
ET2/CT2	0.33	0.34	0.33	0.33	0.32	0.32	0.32
								(N1+N3)/(N4+N6)	1.03	1.04	1.04	1.06	1.06	1.07	1.05
R3/f2	0.57	0.53	0.53	0.53	0.53	0.51	0.56
								CT2/CT1	2.30	2.44	2.53	2.70	2.85	3.09	2.59
T34/T45	0.70	0.67	0.62	0.67	0.78	0.75	0.78
								T23/CT3	1.65	1.75	1.85	2.00	2.07	2.27	1.95
ET6/(ET1+ET3)	1.46	1.51	1.44	1.30	1.22	1.45	1.16
								F2/F1	-2.32	-2.45	-2.75	-2.67	-2.46	-2.48	-2.46

Watch 15

Table 16 gives effective focal lengths f of the imaging systems of example one to example seven, effective focal lengths f1 to f7 of the respective lenses, and the like.

Parameter/example	1	2	3	4	5	6	7
								TTL(mm)	6.80	6.80	6.80	6.56	6.80	6.80	6.80
ImgH(mm)	5.26	5.26	5.26	5.26	5.26	5.11	5.26
								FOV(°)	43.6	43.7	43.6	43.5	43.8	42.4	43.8
Fno	2.0	2.0	2.0	2.0	2.0	2.0	2.0
								f(mm)	5.42	5.41	5.43	5.45	5.45	5.46	5.45
f1(mm)	-83.74	-64.75	-59.99	-46.47	-39.52	-36.54	-43.68
								f2(mm)	4.73	4.83	4.84	4.82	4.74	4.79	4.68
f3(mm)	-12.60	-14.57	-14.10	-16.71	-19.09	-20.25	-16.26
								f4(mm)	-478.53	-185.18	200.00	-151.15	-51.15	-49.11	-79.21
f5(mm)	9.61	9.52	10.30	9.95	9.58	9.82	9.78
								f6(mm)	15.32	15.34	15.46	15.67	16.28	15.91	15.99
f7(mm)	-4.26	-4.31	-4.29	-4.31	-4.36	-4.42	-4.29

TABLE 16

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging apparatus is equipped with the imaging system described above.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to 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 system is characterized by comprising seven lenses from an object side to an image side, wherein the seven lenses are divided into a first lens group, a second lens group, a third lens group and a fourth lens group; wherein the content of the first and second substances,

the first lens group includes: a first lens and a second lens;

the second lens group includes: a third lens and a fourth lens;

the third lens group includes: a fifth lens;

the fourth lens group includes: a sixth lens and a seventh lens;

wherein the first lens element has negative refractive power; the second lens element with positive refractive power is made of glass; the object side surface of the third lens is a concave surface; the fifth lens element with positive refractive power; the object side surface of the seventh lens is a concave surface; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area of the imaging system satisfy that: TTL/ImgH < 1.44.

2. The imaging system of claim 1, wherein the first lens group has positive refractive power, the second lens group has negative refractive power, the third lens group has positive refractive power, and the fourth lens group has negative refractive power; an effective focal length F1 of the first lens group and an effective focal length F2 of the second lens group satisfy: -3.5< F2/F1< -1.5.

3. The imaging system of claim 1, wherein an effective focal length f1 of the first lens and an effective focal length f of the imaging system satisfy: f1/f < -3.42.

4. The imaging system of claim 1, wherein an air separation T23 of the second lens and the third lens on an optical axis and a center thickness CT3 of the third lens on the optical axis satisfy: 1< T23/CT3< 3.

5. The imaging system of claim 1, wherein a center thickness CT1 of the first lens on an optical axis and a center thickness CT2 of the second lens on the optical axis satisfy: 1.7< CT2/CT1< 3.6.

6. The imaging system of claim 1, wherein a radius of curvature R3 of the object side of the second lens and an effective focal length f2 of the second lens satisfy: 0< R3/f2< 0.9.

7. The imaging system of claim 1, wherein the sixth lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the image side surface of the sixth lens and the effective focal length f6 of the sixth lens satisfy: 0< (R11+ R12)/f6< 1.

8. The imaging system of claim 1, wherein the seventh lens has both an object-side surface and an image-side surface that are concave; an effective focal length f7 of the seventh lens and a combined focal length f123 of the first lens, the second lens and the third lens satisfy: -1< f7/f123< 0.

9. The imaging system of claim 1, wherein a center thickness CT5 of the fifth lens on an optical axis and an edge thickness ET5 of the fifth lens satisfy: ET5/CT5 of 0< ET/CT is less than or equal to 0.97.

10. The imaging system of claim 1, wherein the edge thickness ET1 of the first lens, the edge thickness ET3 of the third lens, and the edge thickness ET6 of the sixth lens are such that: ET6/(ET1+ ET3) <2 is more than or equal to 1.16.

11. The imaging system of claim 1, wherein a center thickness CT2 of the second lens on an optical axis and an edge thickness ET2 of the second lens satisfy: 0< ET2/CT2< 0.9.

12. The imaging system of claim 1, wherein an air space T34 on an optical axis between the third lens and the fourth lens and an air space T45 on the optical axis between the fourth lens and the fifth lens satisfies: T34/T45< 1.

13. The imaging system of claim 1, wherein the refractive index of the first lens, N1, the refractive index of the third lens, N3, the refractive index of the fourth lens, N4, and the refractive index of the sixth lens, N6, satisfy: 0< (N1+ N3)/(N4+ N6) < 1.1.

14. The imaging system according to claim 1, wherein an abbe number Vn of any one of the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens and an abbe number V2 of the second lens satisfy: v2> Vn.

15. An imaging system is characterized by comprising seven lenses from an object side to an image side, wherein the seven lenses are divided into a first lens group, a second lens group, a third lens group and a fourth lens group; wherein the content of the first and second substances,

the first lens group with positive refractive power comprises: a first lens and a second lens;

the second lens group with negative refractive power includes: a third lens and a fourth lens;

the third lens group with positive refractive power includes: a fifth lens;

the fourth lens group with negative refractive power includes: a sixth lens and a seventh lens;

wherein the first lens element has negative refractive power; the second lens element with positive refractive power is made of glass; the object side surface of the third lens is a concave surface; the fifth lens element with positive refractive power; the object side surface of the seventh lens is a concave surface; an effective focal length F1 of the first lens group and an effective focal length F2 of the second lens group satisfy: -3.5< F2/F1< -1.5.

16. The imaging system of claim 15, wherein an effective focal length f1 of the first lens and an effective focal length f of the imaging system satisfy: f1/f < -3.42.

17. The imaging system of claim 15, wherein an on-axis distance TTL from an object-side surface to an imaging surface of the first lens meets one half ImgH of a diagonal length of an effective pixel area of the imaging system: TTL/ImgH < 1.44; an air interval T23 of the second lens and the third lens on an optical axis and a central thickness CT3 of the third lens on the optical axis satisfy: 1< T23/CT3< 3.

18. The imaging system of claim 15, wherein a center thickness CT1 of the first lens on an optical axis and a center thickness CT2 of the second lens on the optical axis satisfy: 1.7< CT2/CT1< 3.6.

19. The imaging system of claim 15, wherein a radius of curvature R3 of the object side of the second lens and an effective focal length f2 of the second lens satisfy: 0< R3/f2< 0.9.

20. The imaging system of claim 15, wherein the sixth lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the image side surface of the sixth lens and the effective focal length f6 of the sixth lens satisfy: 0< (R11+ R12)/f6< 1.

21. The imaging system of claim 15, wherein the seventh lens has both an object-side surface and an image-side surface that are concave; an effective focal length f7 of the seventh lens and a combined focal length f123 of the first lens, the second lens and the third lens satisfy: -1< f7/f123< 0.

22. The imaging system of claim 15, wherein a center thickness CT5 of the fifth lens on an optical axis and an edge thickness ET5 of the fifth lens satisfy: ET5/CT5 of 0< ET/CT is less than or equal to 0.97.

23. The imaging system of claim 15, wherein an edge thickness ET1 of the first lens, an edge thickness ET3 of the third lens, and an edge thickness ET6 of the sixth lens satisfy: ET6/(ET1+ ET3) <2 is more than or equal to 1.16.

24. The imaging system of claim 15, wherein a center thickness CT2 of the second lens on an optical axis and an edge thickness ET2 of the second lens satisfy: 0< ET2/CT2< 0.9.

25. The imaging system of claim 15, wherein an air space T34 on an optical axis between the third lens and the fourth lens and an air space T45 on the optical axis between the fourth lens and the fifth lens satisfies: T34/T45< 1.

26. The imaging system of claim 15, wherein the refractive index of the first lens, N1, the refractive index of the third lens, N3, the refractive index of the fourth lens, N4, and the refractive index of the sixth lens, N6, satisfy: 0< (N1+ N3)/(N4+ N6) < 1.1.

27. The imaging system according to claim 15, wherein an abbe number Vn of any one of the first, third, fourth, fifth, sixth, and seventh lenses and an abbe number V2 of the second lens satisfy: v2> Vn.