CN112748541A

CN112748541A - Camera lens

Info

Publication number: CN112748541A
Application number: CN202110041363.XA
Authority: CN
Inventors: 唐梦娜; 侯璟; 闻人建科; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-05-04
Anticipated expiration: 2041-01-13
Also published as: CN114217410B; CN112748541B; CN114217410A

Abstract

The present application provides an image pickup lens, which sequentially comprises, from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having a positive optical power; a fifth lens having a negative optical power; a sixth lens having positive optical power; and a seventh lens having a negative optical power. The camera lens can satisfy: 11mm<TTL×ImgH/f<17 mm; and | DIST_0.8F|<2%, wherein f is the total effective focal length of the camera lens, TTL is the distance from the object side surface of the first lens to the imaging surface of the camera lens along the optical axis, ImgH is half of the diagonal length of the effective pixel area on the imaging surface, DIST_0.8FIs distortion at the 0.8 field of view of the camera lens.

Description

Camera lens

Technical Field

The present application relates to the field of optical elements, and in particular, to an imaging lens including seven lenses.

Background

In recent years, with the rapid development of electronic devices, rich and strict requirements are placed on photographing technologies of smart terminal devices represented by mobile phones, so that various camera lenses with different functions, such as large aperture, ultra-wide angle, ultra-thin, small head, portrait mode, and the like, are emerging in the market.

In order to meet the demands of diversified markets and faster updating speed, the design of camera lenses carried on intelligent terminal equipment such as mobile phones and the like is more and more compact with the trend of the times, and the yield is continuously increased so as to meet the increasing material culture needs of users. The wide-angle lens has a wide field range, so that a large amount of information can be obtained through one-time imaging, and the wide-angle lens is deeply favored by manufacturers and consumers. However, the large field angle of the wide-angle lens inevitably brings large distortion, which causes different vertical axis magnifications at different image heights, and finally affects the imaging quality.

Disclosure of Invention

In one aspect, the present disclosure provides an imaging lens that may include, in order from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having a positive optical power; a fifth lens having a negative optical power; a sixth lens having positive optical power; and a seventh lens having a negative optical power. The camera lens can satisfy: 11mm<TTL×ImgH/f<17 mm; and | DIST_0.8F|<2%, wherein f is the total effective focal length of the camera lens, TTL is the distance from the object side surface of the first lens to the imaging surface of the camera lens along the optical axis, ImgH is half of the diagonal length of the effective pixel area on the imaging surface, DIST_0.8FIs distortion at the 0.8 field of view of the camera lens.

In some embodiments, the imaging lens may satisfy 50 ° < Semi-FOV <65 °, where Semi-FOV is the maximum half field angle of the imaging lens.

In some embodiments, the imaging lens may satisfy 3mm < TTL/TAN (Semi-FOV) <5mm, where TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging surface, and Semi-FOV is a maximum half field angle of the imaging lens.

In some embodiments, the imaging lens may satisfy 0.4< ∑ CT/TTL <0.7, where Σ CT is a sum of central thicknesses of the first lens to the seventh lens along the optical axis, respectively, and TTL is a distance along the optical axis from the object side surface of the first lens to the imaging surface.

In some embodiments, the imaging lens may satisfy 1< f/EPD <3, where f is the total effective focal length of the imaging lens and EPD is the entrance pupil diameter of the imaging lens.

In some embodiments, the imaging lens may further include a stop, and may satisfy 3< DT11/DTs <5, where DT11 is a maximum effective radius of an object side surface of the first lens, and DTs is an effective radius of the stop.

In some embodiments, the camera lens may satisfy-3 < f1/f <0, where f is the total effective focal length of the camera lens and f1 is the effective focal length of the first lens.

In some embodiments, the imaging lens may satisfy 0< f/R3<1, where f is the total effective focal length of the imaging lens and R3 is the radius of curvature of the object side of the second lens.

In some embodiments, the imaging lens may satisfy 0< R3/R4<1, where R3 is a radius of curvature of an object-side surface of the second lens and R4 is a radius of curvature of an image-side surface of the second lens.

In some embodiments, the imaging lens may satisfy 4< f/CT3<8, where f is the total effective focal length of the imaging lens and CT3 is the center thickness of the third lens along the optical axis.

In some embodiments, the imaging lens may satisfy-2 < f/R7+ f/R8<0, where f is a total effective focal length of the imaging lens, R7 is a radius of curvature of an object-side surface of the fourth lens, and R8 is a radius of curvature of an image-side surface of the fourth lens.

In some embodiments, the imaging lens may satisfy-1 < CT5/f5<0, where f5 is an effective focal length of the fifth lens and CT5 is a center thickness of the fifth lens along the optical axis.

In some embodiments, the imaging lens may satisfy f/f6+ f/f7<0.5, where f is a total effective focal length of the imaging lens, f6 is an effective focal length of the sixth lens, and f7 is an effective focal length of the seventh lens.

In another aspect, the present application provides an imaging lens, which may include, in order from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having a positive optical power; a fifth lens having a negative optical power; a sixth lens having positive optical power; and a seventh lens having a negative optical power. The camera lens can satisfy: 3mm<TTL/TAN(Semi-FOV)<5 mm; and | DIST_0.8F|<2%, wherein TTL is the distance from the object side surface of the first lens to the imaging surface of the camera lens along the optical axis, Semi-FOV is the maximum half field angle of the camera lens, DIST_0.8FIs distortion at the 0.8 field of view of the camera lens.

In some embodiments, the imaging lens may satisfy 11mm < TTL × ImgH/f <17mm, where f is a total effective focal length of the imaging lens, TTL is a distance along an optical axis from an object side surface of the first lens to an imaging surface, and ImgH is a half of a diagonal length of an effective pixel area on the imaging surface.

In some embodiments, the imaging lens may satisfy 3< DT11/DTs <5, where DT11 is the maximum effective radius of the object side of the first lens and DTs is the effective radius of a stop in the imaging lens.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application;

fig. 2A to 2C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 1, respectively;

fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application;

fig. 4A to 4C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 2, respectively;

fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application;

fig. 6A to 6C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 3, respectively;

fig. 7 is a schematic configuration diagram showing an imaging lens according to embodiment 4 of the present application;

fig. 8A to 8C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 4, respectively;

fig. 9 is a schematic configuration diagram showing an imaging lens according to embodiment 5 of the present application;

fig. 10A to 10C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 5, respectively;

fig. 11 is a schematic configuration diagram showing an imaging lens according to embodiment 6 of the present application;

fig. 12A to 12C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens of embodiment 6;

fig. 13 is a schematic configuration diagram showing an imaging lens according to embodiment 7 of the present application;

fig. 14A to 14C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of an imaging lens of example 7

Fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 8 of the present application;

fig. 16A to 16C respectively show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve chart 17 of an imaging lens of embodiment 8, which show structural schematic diagrams of an imaging lens according to embodiment 9 of the present application; and

fig. 18A to 18C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of example 9, respectively.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

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 closest to the object is called the object side surface of the lens, and the surface of each lens closest to the image side is called the image side surface of the lens.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

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

The features, principles and other aspects of the present application are described in detail below.

An image pickup lens according to an exemplary embodiment of the present application may include seven lenses having optical power, respectively a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens element to the seventh lens element are arranged along an optical axis of the imaging lens in order from an object side to an image side, and any two adjacent lens elements may have a distance therebetween.

In an exemplary embodiment, the first lens may have a negative power; the second lens may have optical power; the third lens may have optical power; the fourth lens may have a positive optical power; the fifth lens may have a negative optical power; the sixth lens may have a positive optical power; and the seventh lens may have a negative optical power.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 11mm < TTL × ImgH/f <17mm, where TTL is a distance along an optical axis from an object side surface of the first lens element to an imaging surface of the imaging lens, ImgH is a half of a diagonal length of an effective pixel area on the imaging surface, and f is a total effective focal length of the imaging lens. The requirements that the thickness is 11mm < TTL multiplied by ImgH/f <17mm are met, the overall miniaturization of the camera lens can be ensured, and the imaging lens can be ensured to have a larger image surface range. Meanwhile, the effective focal length of the camera lens is limited, so that the camera lens can have a sufficiently large field angle and has the characteristics of a wide-angle lens.

In an exemplary embodiment, according to the present applicationThe camera lens can satisfy the following conditions: | DIST_0.8F|<2% of, wherein DIST_0.8FIs the distortion of the camera lens at 0.8 field of view. The surface type and the thickness of each lens in the pick-up lens are optimized, so that the pick-up lens meets the condition of | DIST_0.8F|<2%, the small distortion characteristic of the camera lens in a wide-angle mode is favorably realized, and the imaging quality is further improved.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 50 ° < Semi-FOV <65 °, where Semi-FOV is the maximum half field angle of the camera lens. The camera lens meets 50 degrees < Semi-FOV <65 degrees, and can realize a wide-angle shooting mode of the camera lens, so that the camera lens can acquire images in a larger field range. For example, the Semi-FOV may satisfy 55 ° < Semi-FOV <65 °.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 3mm < TTL/TAN (Semi-FOV) <5mm, where TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface of the image pickup lens, and Semi-FOV is the maximum half field angle of the image pickup lens. The requirements that the thickness of the camera lens is 3mm < TTL/TAN (Semi-FOV) <5mm are met, the camera lens can be ensured to have a smaller size, and meanwhile, the half field angle of the camera lens is increased as much as possible so as to acquire object information in a larger angle range.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.4< ∑ CT/TTL <0.7, where Σ CT is a sum of central thicknesses of the first lens to the seventh lens along the optical axis, respectively, and TTL is a distance along the optical axis from an object-side surface of the first lens to an imaging surface of the imaging lens. Satisfy 0.4< ∑ CT/TTL <0.7, can guarantee to have sufficient air space between each lens and between last lens to the imaging surface in the camera lens, be favorable to camera lens's structural design and produce the line assemblage technology, the distortion of camera lens that can also be better balanced reduces the ghost image energy between each lens, and then weakens the ghost image risk that each lens brought. In addition, the camera lens has a larger forming and debugging process space, stray light risks caused by appearance problems of all lenses are avoided, and CRA (Chief Ray Angle) in the camera lens can be better matched with a photosensitive chip of an imaging surface.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1< f/EPD <3, where f is the total effective focal length of the imaging lens and EPD is the entrance pupil diameter of the imaging lens. Satisfy 1< f/EPD <3, through the ratio of restraint camera lens's total effective focal length and entrance pupil diameter, can guarantee under camera lens's the prerequisite of wide angle characteristic, make this camera lens acquire sufficient luminous flux, and then guarantee that the imaging surface has higher illuminance. Therefore, the imaging lens according to the present application can have good imaging quality even at night or in an environment where light energy is weak.

In an exemplary embodiment, an imaging lens according to the present application may further include a diaphragm, and may satisfy: 3< DT11/DTs <5, where DT11 is the maximum effective radius of the object side of the first lens and DTs is the effective radius of the stop. By reasonably controlling the ratio of the effective calibers of the first lens and the diaphragm, the vignetting value of the camera lens can be effectively controlled, and marginal light rays with poor imaging quality in the camera lens are intercepted, so that the relative illumination of an imaging surface is improved. In addition, the eccentricity and the inclination of the whole camera lens caused by overlarge aperture difference between the first lens and the diaphragm can be avoided, and the stability of the camera lens assembly can be ensured. For example, DT11 and DTs may satisfy 3.2< DT11/DTs < 4.5.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: -3< f1/f <0, where f is the total effective focal length of the camera lens and f1 is the effective focal length of the first lens. Satisfying-3 < f1/f <0 can slow down the deflection of light rays in the first lens and avoid the first lens from having too much focal power, thereby reducing the sensitivity of the first lens and avoiding too tight tolerance requirement. In addition, spherical aberration, astigmatism, and the like generated by the first lens can be reduced. For example, f1 and f can satisfy-2 < f1/f < -1.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0< f/R3<1, where f is the total effective focal length of the imaging lens, and R3 is the radius of curvature of the object-side surface of the second lens. The total effective focal length of the camera lens is controlled in a reasonable range, and the range of the maximum half field angle of the camera lens is ensured. The curvature radius of the object side surface of the second lens is constrained to be a large value, so that the curvature radius of the object side surface of the second lens cannot be too small, reflection of light rays is avoided when the light rays pass through the surface easily, and practical processing and reduction of spherical aberration, coma aberration, astigmatism and sensitivity of the second lens are facilitated. For example, f and R3 may satisfy 0.5< f/R3< 0.9.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0< R3/R4<1, where R3 is the radius of curvature of the object-side surface of the second lens and R4 is the radius of curvature of the image-side surface of the second lens. The requirement that 0< R3/R4<1 is met, the processing difficulty caused by overlarge opening angle of the second lens is avoided, meanwhile, the sensitivity of the second lens can be obviously reduced, and strict tolerance limit and process level are avoided, so that coma, curvature of field and the like of the camera lens are effectively compensated. When the second lens meeting the constraint is matched with the first lens, external light can be better converged, and spherical aberration and field curvature generated by the first lens are effectively compensated. Alternatively, the object-side surface of the second lens element may be convex and the image-side surface may be concave.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 4< f/CT3<8, where f is the total effective focal length of the imaging lens and CT3 is the center thickness of the third lens along the optical axis. By controlling the central thickness of the third lens, the processing and assembling procedures of the third lens can be effectively ensured, and the problems of difficult actual debugging, assembly deformation and the like caused by over-thin or over-thick lens are avoided, so that the quality of the camera lens is influenced. In addition, the deflection buffering when light passes through the third lens is facilitated, ghost image risks caused by the deflection buffering are reduced, and distortion and field curvature of the camera lens can be effectively reduced.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: -2< f/R7+ f/R8<0, where f is the total effective focal length of the imaging lens, R7 is the radius of curvature of the object-side surface of the fourth lens, and R8 is the radius of curvature of the image-side surface of the fourth lens. By reasonably distributing the curvature radii of the object side surface and the image side surface of the fourth lens, the excessive curvature of the two optical surfaces of the fourth lens can be avoided to ensure that the rise of the fourth lens is within a certain range, thereby being beneficial to relieving the deflection of light rays in the fourth lens and reducing the sensitivity of the lens. In addition, the arrangement is beneficial to the convergence of light rays, and avoids causing total reflection and generating ghost images. For example, f, R7 and R8 can satisfy-1.8 < f/R7+ f/R8< -0.5. Alternatively, the image-side surface of the fourth lens may be convex.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: -1< CT5/f5<0, wherein f5 is the effective focal length of the fifth lens and CT5 is the central thickness of the fifth lens along the optical axis. By reasonably distributing the thickness of the fifth lens, the risk of the fifth lens generating ghost images is reduced. Meanwhile, the fifth lens and the fourth lens which are configured in the above way are matched, so that astigmatism of the camera lens can be effectively reduced, and the process processing difficulty caused by the fact that the fifth lens is too thin and comes is avoided. In addition, through reasonably distributing the focal power of the fifth lens, the problem of sensitivity of the fifth lens caused by the overlarge focal power can be effectively avoided, the aberration of the whole camera lens can be better balanced, and the improvement of the imaging quality of the camera lens is facilitated. For example, CT5 and f5 may satisfy-0.1 < CT5/f5< -0.02. Alternatively, the fifth lens may have a negative power.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: f/f6+ f/f7<0.5, where f is the total effective focal length of the image pickup lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. The optical lens meets the condition that f/f6+ f/f7 is less than 0.5, positive and negative spherical aberration, coma aberration, astigmatism and the like caused by the sixth lens and the seventh lens can be complementarily eliminated, and meanwhile, chromatic dispersion and chromatic aberration caused by different wavelengths can be effectively eliminated, so that the imaging quality of the whole camera lens is improved, and the camera lens obtains better resolving power. For example, f6, and f7 may satisfy-0.2 < f/f6+ f/f7< 0.2. Alternatively, the sixth lens may have a positive optical power, and the seventh lens may have a negative optical power.

In an exemplary embodiment, an image side surface of the sixth lens may be a convex surface.

In an exemplary embodiment, the object-side surface of the seventh lens may be a convex surface, and the image-side surface may be a concave surface.

In an exemplary embodiment, the imaging lens according to the present application may further include a diaphragm, and the diaphragm may be disposed between the second lens and the third lens or between the third lens and the fourth lens. Optionally, the imaging lens further includes a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface.

The imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, seven as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the camera lens can be effectively reduced, the machinability of the camera lens can be improved, and the camera lens is more beneficial to production and processing and can be suitable for portable electronic products. The imaging lens configured as described above can have features such as a small size, good imaging quality, and image power. In addition, according to the lens disclosed by the application, the optical distortion in a 0.8 field is ensured to be less than 2% on the basis of a large field, so that the small optical distortion can be realized during wide-angle shooting.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror, that is, at least one of the object-side surface of the first lens to the image-side surface of the seventh lens is an aspherical mirror. 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 lens center to the lens periphery, an aspherical lens has a better curvature radius characteristic, and has an advantage of improving distortion aberration, that is, astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, and the imaging quality is further improved. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspheric mirror surface. Optionally, each of the first, second, third, fourth, fifth, sixth, and seventh lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting an imaging lens may 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 lens is not limited to including seven lenses. The camera lens may also include other numbers of lenses, if desired.

Specific examples of an imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1 to 2C. Fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application.

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

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

Basic parameters of the imaging lens of embodiment 1 are shown in table 1, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 1

In this example, the total effective focal length f of the imaging lens is 1.98mm, the maximum field angle FOV of the imaging lens is 127.5 °, the maximum effective radius DT11 of the object-side surface S1 of the first lens E1 is 2.44mm, and the effective radius DTs of the stop STO is 0.69 mm.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the seventh lens E7 are aspheric surfaces, and the surface shape x of the aspheric lens can be defined by, but is not limited to, the following aspheric surface 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 shows the high-order coefficient coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 which can be used for each of the aspherical mirror surfaces S1-S14 in example 1.

TABLE 2

Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 1. Fig. 2C shows a distortion curve of the imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 2A to 2C, the imaging lens system according to embodiment 1 can achieve good imaging quality.

Example 2

An imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4C. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application.

As shown in fig. 3, the imaging lens system, in order from an object side to an image side, may include: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the subject 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 lens is 1.97mm, the maximum field angle FOV of the imaging lens is 125.6 °, the maximum effective radius DT11 of the object-side surface S1 of the first lens E1 is 2.43mm, and the effective radius DTs of the stop STO is 0.69 mm.

Basic parameters of the imaging lens of embodiment 2 are shown in table 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 4 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each of the aspherical mirror surfaces S1 through S14 in example 2, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 3

TABLE 4

Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 2. Fig. 4C shows a distortion curve of the imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 4A to 4C, the imaging lens according to embodiment 2 can achieve good imaging quality.

Example 3

An imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6C. Fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application.

As shown in fig. 5, the imaging lens system, in order from an object side to an image side, may include: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.

In this example, the total effective focal length f of the imaging lens is 1.99mm, the maximum field angle FOV of the imaging lens is 125.6 °, the maximum effective radius DT11 of the object-side surface S1 of the first lens E1 is 2.39mm, and the effective radius DTs of the stop STO is 0.68 mm.

Basic parameters of the imaging lens of embodiment 3 are shown in table 5, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 6 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each of the aspherical mirror surfaces S1 through S14 in example 3, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 5

TABLE 6

Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 3. Fig. 6C shows a distortion curve of the imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 6A to 6C, the imaging lens system according to embodiment 3 can achieve good imaging quality.

Example 4

An imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8C. Fig. 7 shows a schematic configuration diagram of an imaging lens according to embodiment 4 of the present application.

As shown in fig. 7, the imaging lens system, in order from an object side to an image side, may include: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the subject 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 lens is 2.02mm, the maximum field angle FOV of the imaging lens is 127.5 °, the maximum effective radius DT11 of the object-side surface S1 of the first lens E1 is 2.56mm, and the effective radius DTs of the stop STO is 0.62 mm.

Basic parameters of the imaging lens of embodiment 4 are shown in table 7, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 8-1 and 8-2 show the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 that can be used for each of the aspherical mirror surfaces S1 through S14 in example 4, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.1873E-01

-2.9079E-01

2.2711E-01

-1.3711E-01

6.1940E-02

-2.0638E-02

5.0118E-03

S2

3.5435E-01

-2.3743E-01

3.9319E-01

-1.8967E+00

5.5951E+00

-9.0826E+00

7.8246E+00

S3

7.0681E-02

-8.0774E-02

-9.8974E-02

1.5369E+00

-5.9050E+00

1.2846E+01

-1.7851E+01

S4

1.4908E-01

-2.6364E-01

2.4113E+00

-1.0034E+01

2.3321E+01

-2.0042E+01

-3.7184E+01

S5

9.6599E-02

-5.4842E-02

5.2563E-01

-1.6680E+00

2.4693E+00

-1.7811E+00

5.0004E-01

S6

1.1075E-01

-9.3687E-02

1.7294E-01

-4.4666E-01

6.6546E-01

0.0000E+00

S7

7.7452E-02

-1.4246E-01

2.0583E-01

-7.3279E-01

1.1773E+00

-7.6631E-01

8.1637E-02

S8

-8.4907E-02

-1.2424E+00

1.1298E+01

-7.7890E+01

3.8952E+02

-1.4072E+03

3.6922E+03

S9

-7.0591E-02

-6.3998E-01

9.2188E-01

8.2723E+00

-7.4518E+01

3.5164E+02

-1.1249E+03

S10

6.5518E-02

-3.3074E-01

6.1000E-01

-5.6478E-01

2.9662E-01

-8.6666E-02

1.2965E-02

S11

9.6050E-02

-1.6842E-01

1.6986E-01

-1.3130E-01

7.6757E-02

-3.0856E-02

7.8586E-03

S12

-2.6350E-02

4.7104E-02

-1.0543E-01

1.1400E-01

-7.3140E-02

2.8737E-02

-6.6245E-03

S13

1.6381E-03

-2.4216E-02

-2.2046E-02

3.8960E-02

-2.6993E-02

1.1778E-02

-3.5653E-03

S14

-2.9482E-02

8.9820E-03

-1.2039E-02

9.6745E-03

-4.4696E-03

1.3366E-03

-2.7396E-04

TABLE 8-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-8.7103E-04

1.0491E-04

-8.2711E-06

3.8575E-07

-9.3246E-09

2.0859E-10

-9.6097E-12

S2

-1.6533E+00

-3.9030E+00

4.8735E+00

-2.8430E+00

9.4775E-01

-1.7379E-01

1.3654E-02

S3

1.6159E+01

-9.2420E+00

2.9814E+00

-3.0310E-01

-1.1371E-01

3.6863E-02

-2.7475E-03

S4

1.2519E+02

-1.4818E+02

8.3127E+01

-1.8371E+01

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

0.0000E+00

S8

-7.0470E+03

9.7092E+03

-9.4642E+03

6.2832E+03

-2.6509E+03

6.1985E+02

-5.6898E+01

S9

2.5644E+03

-4.2130E+03

4.9494E+03

-4.0506E+03

2.1906E+03

-7.0275E+02

1.0117E+02

S10

-8.3476E-04

0.0000E+00

S11

-1.1352E-03

7.0435E-05

0.0000E+00

S12

8.1562E-04

-4.1334E-05

0.0000E+00

S13

7.6760E-04

-1.1714E-04

1.2376E-05

-8.6020E-07

3.5378E-08

-6.5231E-10

0.0000E+00

S14

3.9371E-05

-3.9696E-06

2.7524E-07

-1.2502E-08

3.3495E-10

-4.0122E-12

0.0000E+00

TABLE 8-2

Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 8B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 4. Fig. 8C shows a distortion curve of the imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 8A to 8C, the imaging lens according to embodiment 4 can achieve good imaging quality.

Example 5

An imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10C. Fig. 9 shows a schematic configuration diagram of an imaging lens according to embodiment 5 of the present application.

As shown in fig. 9, the imaging lens system, in order from an object side to an image side, may include: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.

In this example, the total effective focal length f of the imaging lens is 1.96mm, the maximum field angle FOV of the imaging lens is 125.8 °, the maximum effective radius DT11 of the object-side surface S1 of the first lens E1 is 2.44mm, and the effective radius DTs of the stop STO is 0.74 mm.

Basic parameters of the imaging lens of embodiment 5 are shown in table 9, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 10 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each of the aspherical mirror surfaces S1 through S14 in example 5, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 9

Watch 10

Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 5. Fig. 10C shows a distortion curve of the imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 10A to 10C, the imaging lens according to embodiment 5 can achieve good imaging quality.

Example 6

An imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12C. Fig. 11 shows a schematic configuration diagram of an imaging lens according to embodiment 6 of the present application.

As shown in fig. 11, the imaging lens system, in order from an object side to an image side, may include: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the subject 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 lens is 1.98mm, the maximum field angle FOV of the imaging lens is 127.6 °, the maximum effective radius DT11 of the object-side surface S1 of the first lens E1 is 2.26mm, and the effective radius DTs of the stop STO is 0.61 mm.

Basic parameters of the imaging lens of embodiment 6 are shown in table 11, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 12-1 and 12-2 show the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 that can be used for each of the aspherical mirror surfaces S1 through S14 in example 6, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 11

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.7330E-01

-1.2991E-01

7.5830E-02

-3.1296E-02

8.7345E-03

-1.5586E-03

1.6297E-04

S2

1.6092E-01

9.7068E-01

-7.9261E+00

3.7987E+01

-1.2659E+02

3.0157E+02

-5.1983E+02

S3

4.9124E-02

-1.7927E-02

-2.4408E-01

6.5433E-01

-1.0181E+00

9.7964E-01

-5.1857E-01

S4

1.1706E-01

-6.6852E-02

7.7651E-02

7.0031E-03

-2.4794E-02

0.0000E+00

S5

8.0281E-02

3.4749E-02

3.4334E-02

-2.1680E-01

-3.6643E-02

5.1130E-01

-3.0987E-01

S6

1.5906E-01

-1.4313E-01

2.5447E-01

-2.3263E-01

7.3084E-02

0.0000E+00

S7

1.1418E-01

-6.9203E-02

-4.2345E-01

1.5607E+00

-2.6537E+00

2.2559E+00

-7.3823E-01

S8

4.3856E-02

-2.7979E+00

3.0761E+01

-2.4952E+02

1.4432E+03

-5.9736E+03

1.7882E+04

S9

-6.0801E-02

-1.2142E-01

-6.4576E+00

6.7591E+01

-3.7600E+02

1.3839E+03

-3.5759E+03

S10

1.2845E-01

-7.4819E-01

1.6025E+00

-1.9091E+00

1.3869E+00

-6.1087E-01

1.5048E-01

S11

1.6841E-01

-5.4159E-01

7.8753E-01

-6.7470E-01

3.6886E-01

-1.2903E-01

2.7427E-02

S12

-5.7486E-03

-1.0596E-01

8.1533E-02

-7.5373E-03

-3.1181E-02

2.3958E-02

-7.9729E-03

S13

1.3606E-01

-2.2405E-01

6.6324E-02

1.1408E-01

-1.6553E-01

1.1115E-01

-4.5972E-02

S14

6.1470E-02

-1.2346E-01

9.8101E-02

-4.9453E-02

1.7186E-02

-4.2507E-03

7.5884E-04

TABLE 12-1

TABLE 12-2

Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 6. Fig. 12C shows a distortion curve of the imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 12A to 12C, the imaging lens according to embodiment 6 can achieve good imaging quality.

Example 7

An imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14C. Fig. 13 shows a schematic configuration diagram of an imaging lens according to embodiment 7 of the present application.

As shown in fig. 13, the imaging lens system, in order from an object side to an image side, may include: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the subject 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 lens is 1.97mm, the maximum field angle FOV of the imaging lens is 129.4 °, the maximum effective radius DT11 of the object-side surface S1 of the first lens E1 is 2.48mm, and the effective radius DTs of the stop STO is 0.74 mm.

Basic parameters of the imaging lens of embodiment 7 are shown in table 13, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Tables 14-1 and 14-2 show the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 that can be used for each of the aspherical mirror surfaces S1 through S14 in example 7, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

Watch 13

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.8111E-02

-1.3223E-02

-7.9909E-04

1.4069E-02

-1.7447E-02

1.2285E-02

-5.7663E-03

S2

5.5566E-02

-1.9760E-02

-5.5280E-02

4.0399E-01

-1.2053E+00

2.3213E+00

-3.1233E+00

S3

4.4958E-02

1.3796E-02

-1.6444E-02

-2.4656E-02

4.8191E-01

-1.9535E+00

4.3484E+00

S4

1.5987E-01

-1.1342E+00

1.5818E+01

-1.3352E+02

7.6709E+02

-3.1152E+03

9.1455E+03

S5

-5.1573E-02

1.1153E+00

-2.1464E+01

2.5204E+02

-1.9766E+03

1.0767E+04

-4.1783E+04

S6

4.2372E-02

-1.7013E+00

3.8882E+01

-5.5733E+02

5.2697E+03

-3.4365E+04

1.5883E+05

S7

7.4313E-02

-4.2165E-01

6.1756E+00

-6.8690E+01

5.3643E+02

-2.9741E+03

1.1792E+04

S8

-2.3709E-01

-1.3417E+00

2.1391E+01

-1.8014E+02

1.0253E+03

-4.1485E+03

1.2170E+04

S9

-1.3034E-01

-4.7355E-01

2.0035E+00

6.6163E+00

-1.2737E+02

7.5339E+02

-2.6464E+03

S10

-1.5510E-01

2.1358E-01

-3.8117E-01

1.1120E+00

-4.4910E+00

1.4240E+01

-3.0886E+01

S11

1.7052E-02

-9.1097E-02

2.9922E-01

-6.8068E-01

1.0271E+00

-1.0527E+00

7.5425E-01

S12

-1.3505E-01

2.3290E-01

-4.5093E-01

7.1934E-01

-8.5732E-01

7.4580E-01

-4.7022E-01

S13

-1.7421E-01

1.0498E-01

-1.0024E-01

8.3604E-02

-4.9462E-02

2.0903E-02

-6.5091E-03

S14

-4.4234E-02

1.4919E-02

-7.6609E-03

4.8651E-03

-2.2524E-03

7.0574E-04

-1.5382E-04

TABLE 14-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.9007E-03

-4.4822E-04

7.5527E-05

-8.9057E-06

6.9971E-07

-3.2974E-08

7.0648E-10

S2

3.0092E+00

-2.0851E+00

1.0294E+00

-3.5302E-01

7.9857E-02

-1.0709E-02

6.4472E-04

S3

-6.1728E+00

5.8681E+00

-3.7823E+00

1.6289E+00

-4.4722E-01

7.0448E-02

-4.8163E-03

S4

-1.9610E+04

3.0701E+04

-3.4685E+04

2.7517E+04

-1.4536E+04

4.5892E+03

-6.5487E+02

S5

1.1700E+05

-2.3685E+05

3.4315E+05

-3.4672E+05

2.3193E+05

-9.2272E+04

1.6525E+04

S6

-5.2793E+05

1.2659E+06

-2.1699E+06

2.5928E+06

-2.0510E+06

9.6517E+05

-2.0454E+05

S7

-3.3573E+04

6.8495E+04

-9.9000E+04

9.8740E+04

-6.4507E+04

2.4797E+04

-4.2447E+03

S8

-2.6104E+04

4.0910E+04

-4.6302E+04

3.6845E+04

-1.9558E+04

6.2201E+03

-8.9693E+02

S9

6.2068E+03

-1.0096E+04

1.1462E+04

-8.9266E+03

4.5498E+03

-1.3675E+03

1.8376E+02

S10

4.6157E+01

-4.8184E+01

3.5131E+01

-1.7554E+01

5.7332E+00

-1.1032E+00

9.4861E-02

S11

-3.8453E-01

1.4027E-01

-3.6348E-02

6.5312E-03

-7.7351E-04

5.4291E-05

-1.7102E-06

S12

2.1450E-01

-7.0501E-02

1.6494E-02

-2.6758E-03

2.8591E-04

-1.8090E-05

5.1338E-07

S13

1.5220E-03

-2.6769E-04

3.4850E-05

-3.2453E-06

2.0350E-07

-7.6663E-09

1.3067E-10

S14

2.3862E-05

-2.6557E-06

2.1052E-07

-1.1595E-08

4.2137E-10

-9.0769E-12

8.7708E-14

TABLE 14-2

Fig. 14A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 7, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 7. Fig. 14C shows a distortion curve of the imaging lens of embodiment 7, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 14A to 14C, the imaging lens according to embodiment 7 can achieve good imaging quality.

Example 8

An imaging lens according to embodiment 8 of the present application is described below with reference to fig. 15 to 16C. Fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 8 of the present application.

As shown in fig. 15, the imaging lens system, in order from an object side to an image side, may include: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the subject 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 lens is 2.36mm, the maximum field angle FOV of the imaging lens is 114.0 °, the maximum effective radius DT11 of the object-side surface S1 of the first lens E1 is 2.46mm, and the effective radius DTs of the stop STO is 0.72 mm.

Basic parameters of the imaging lens of embodiment 8 are shown in table 15, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 16 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each of the aspherical mirror surfaces S1 through S14 in example 8, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

Watch 15

TABLE 16

Fig. 16A shows an on-axis chromatic aberration curve of an imaging lens of embodiment 8, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 16B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 8. Fig. 16C shows a distortion curve of the imaging lens of embodiment 8, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 16A to 16C, the imaging lens according to embodiment 8 can achieve good imaging quality.

Example 9

An imaging lens according to embodiment 9 of the present application is described below with reference to fig. 17 to 18C. Fig. 17 shows a schematic configuration diagram of an imaging lens according to embodiment 9 of the present application.

As shown in fig. 17, the imaging lens system, in order from an object side to an image side, may include: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the subject 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 lens is 2.36mm, the maximum field angle FOV of the imaging lens is 116.1 °, the maximum effective radius DT11 of the object-side surface S1 of the first lens E1 is 2.50mm, and the effective radius DTs of the stop STO is 0.70 mm.

Basic parameters of the imaging lens of example 9 are shown in table 17, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 18 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each of the aspherical mirror surfaces S1 through S14 in example 9, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 17

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.2982E-02

-5.3526E-03

1.0666E-03

-1.0413E-04

-2.5539E-06

1.9339E-06

-1.1864E-07

0.0000E+00

S2

6.4890E-02

-3.7263E-03

2.6709E-02

-3.2040E-02

2.0033E-02

-5.1173E-03

1.6243E-04

0.0000E+00

S3

2.1585E-02

5.4674E-02

-8.8635E-02

1.3249E-01

-1.1724E-01

4.9696E-02

-7.6781E-03

0.0000E+00

S4

1.0193E-01

1.1878E-04

3.1134E-01

-1.0723E+00

1.7975E+00

-1.5491E+00

5.5375E-01

0.0000E+00

S5

8.2858E-02

-4.5730E-02

-3.6654E-01

1.7809E+00

-6.2889E+00

1.3477E+01

-1.7195E+01

1.2176E+01

-3.6618E+00

S6

4.2525E-02

-3.9527E-01

3.6706E+00

-2.7380E+01

1.2095E+02

-3.2624E+02

5.2814E+02

-4.6995E+02

1.7655E+02

S7

3.2637E-02

-5.5150E-02

-5.0822E-02

2.3028E-01

-3.9310E-01

3.9031E-01

-1.3557E-01

0.0000E+00

S8

-3.7817E-01

5.1980E-01

-6.8047E-01

3.2569E-01

2.6436E-01

-4.5511E-01

1.9624E-01

0.0000E+00

S9

-1.9494E-01

9.0477E-02

-1.8196E-01

8.1263E-01

-2.7566E+00

5.0632E+00

-5.2426E+00

2.9057E+00

-6.6971E-01

S10

-1.5035E-01

1.4766E-01

-1.1232E-01

2.8729E-02

4.3605E-02

-4.7111E-02

2.1472E-02

-4.9835E-03

4.8069E-04

S11

-1.2511E-02

-4.4712E-02

4.2401E-02

-1.8218E-02

4.9586E-03

-7.6142E-04

4.9733E-05

0.0000E+00

S12

-8.2993E-02

5.8424E-02

-3.8196E-02

1.7000E-02

-4.0356E-03

4.6738E-04

-2.0994E-05

0.0000E+00

S13

-2.1170E-01

4.1399E-02

-4.1057E-03

7.0935E-04

-2.0272E-04

1.2938E-05

-3.5462E-07

0.0000E+00

S14

-8.8589E-02

2.8147E-02

-5.4473E-03

5.9488E-04

-4.3411E-05

1.9709E-06

-3.8046E-08

0.0000E+00

Watch 18

Fig. 18A shows an on-axis chromatic aberration curve of an imaging lens of embodiment 9, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 18B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 9. Fig. 18C shows a distortion curve of the imaging lens of embodiment 9, which shows distortion magnitude values corresponding to different angles of view. As can be seen from fig. 18A to 18C, the imaging lens according to embodiment 9 can achieve good imaging quality.

In summary, examples 1 to 9 each satisfy the relationship shown in table 19.

Watch 19

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

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

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

a first lens having a negative optical power;

a second lens having an optical power;

a third lens having optical power;

a fourth lens having a positive optical power;

a fifth lens having a negative optical power;

a sixth lens having positive optical power; and

a seventh lens having a negative optical power;

the camera lens satisfies:

11mm < TTL × ImgH/f <17 mm; and

|DIST_0.8F|<2％，

wherein f is a total effective focal length of the camera lens, TTL is a distance along the optical axis from an object-side surface of the first lens element to an imaging surface of the camera lens, ImgH is a half of a diagonal length of an effective pixel area on the imaging surface, and DIST is a distance between the object-side surface of the first lens element and the imaging surface of the camera lens, and ImgH is a distance between the object-side surface of the first lens element and_0.8Fis the distortion at the 0.8 field of view of the camera lens.

2. The imaging lens according to claim 1, characterized in that 50 ° < Semi-FOV <65 °,

wherein the Semi-FOV is a maximum half field angle of the imaging lens.

3. Camera lens according to claim 1, characterized in that 3mm < TTL/TAN (Semi-FOV) <5mm,

wherein, TTL is the distance between the object side surface of the first lens and the imaging surface along the optical axis, and Semi-FOV is the maximum half field angle of the camera lens.

4. The camera lens of claim 1, wherein 0.4< ∑ CT/TTL <0.7,

Σ CT is a sum of central thicknesses of the first lens element to the seventh lens element along the optical axis, respectively, and TTL is a distance along the optical axis from an object side surface of the first lens element to the image plane.

5. Imaging lens according to claim 1, characterized in that 1< f/EPD <3,

where f is the total effective focal length of the imaging lens and EPD is the entrance pupil diameter of the imaging lens.

6. An image-taking lens according to claim 1, characterized in that the image-taking lens further comprises a diaphragm, and

3< DT11/DTs <5, where DT11 is the maximum effective radius of the object side of the first lens and DTs is the effective radius of the stop.

7. Imaging lens according to claim 1, characterized in that-3 < f1/f <0,

where f is the total effective focal length of the image pickup lens, and f1 is the effective focal length of the first lens.

8. Imaging lens according to claim 1, characterized in that 0< f/R3<1,

where f is the total effective focal length of the imaging lens, and R3 is the radius of curvature of the object side surface of the second lens.

9. The imaging lens according to claim 1, wherein 0< R3/R4<1,

wherein R3 is a radius of curvature of an object-side surface of the second lens, and R4 is a radius of curvature of an image-side surface of the second lens.

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

a first lens having a negative optical power;

a second lens having an optical power;

a third lens having optical power;

a fourth lens having a positive optical power;

a fifth lens having a negative optical power;

a sixth lens having positive optical power; and

a seventh lens having a negative optical power;

the camera lens satisfies:

3mm < TTL/TAN (Semi-FOV) <5 mm; and

|DIST_0.8F|<2％，

wherein, TTL is the distance between the object side surface of the first lens and the imaging surface of the camera lens along the optical axis, Semi-FOV is the maximum half field angle of the camera lens, DIST_0.8FIs the distortion at the 0.8 field of view of the camera lens.